Adding upstream version 1:2.3.19.1+dfsg1.upstream/1%2.3.19.1+dfsg1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

70 files changed, 21268 insertions, 0 deletions

diff --git a/src/lib-imap-client/Makefile.am b/src/lib-imap-client/Makefile.am
new file mode 100644
index 0000000..8fe8a8d
--- /dev/null
+++ b/src/lib-imap-client/Makefile.am
@@ -0,0 +1,53 @@
+noinst_LTLIBRARIES = libimap_client.la
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib \
+	-I$(top_srcdir)/src/lib-test \
+	-I$(top_srcdir)/src/lib-dns \
+	-I$(top_srcdir)/src/lib-sasl \
+	-I$(top_srcdir)/src/lib-ssl-iostream \
+	-I$(top_srcdir)/src/lib-mail \
+	-I$(top_srcdir)/src/lib-imap
+
+libimap_client_la_SOURCES = \
+	imapc-client.c \
+	imapc-connection.c \
+	imapc-msgmap.c
+
+headers = \
+	imapc-client.h \
+	imapc-client-private.h \
+	imapc-connection.h \
+	imapc-msgmap.h
+
+pkginc_libdir=$(pkgincludedir)
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+
+test_programs = \
+	test-imapc-client
+
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+
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+	$(noinst_LTLIBRARIES) \
+	../lib-ssl-iostream/libssl_iostream.la \
+	../lib-sasl/libsasl.la \
+	../lib-imap/libimap.la \
+	../lib-mail/libmail.la \
+	../lib-charset/libcharset.la \
+	../lib-dns/libdns.la \
+	../lib-test/libtest.la \
+	../lib/liblib.la
+
+test_libs = \
+	$(test_deps) \
+	$(MODULE_LIBS)
+
+test_imapc_client_SOURCES = test-imapc-client.c
+test_imapc_client_LDADD = $(test_libs)
+test_imapc_client_DEPENDENCIES = $(test_deps)
+
+check-local:
+	for bin in $(test_programs); do \
+	  if ! $(RUN_TEST) ./$$bin; then exit 1; fi; \
+	done
diff --git a/src/lib-imap-client/Makefile.in b/src/lib-imap-client/Makefile.in
new file mode 100644
index 0000000..a878047
--- /dev/null
+++ b/src/lib-imap-client/Makefile.in
@@ -0,0 +1,880 @@
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+	-I$(top_srcdir)/src/lib-ssl-iostream \
+	-I$(top_srcdir)/src/lib-mail \
+	-I$(top_srcdir)/src/lib-imap
+
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+	imapc-connection.c \
+	imapc-msgmap.c
+
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+	imapc-client-private.h \
+	imapc-connection.h \
+	imapc-msgmap.h
+
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+	test-imapc-client
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+	../lib-ssl-iostream/libssl_iostream.la \
+	../lib-sasl/libsasl.la \
+	../lib-imap/libimap.la \
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+	../lib-charset/libcharset.la \
+	../lib-dns/libdns.la \
+	../lib-test/libtest.la \
+	../lib/liblib.la
+
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+	$(test_deps) \
+	$(MODULE_LIBS)
+
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+	}
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+	@rm -f test-imapc-client$(EXEEXT)
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	  if ! $(RUN_TEST) ./$$bin; then exit 1; fi; \
+	done
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diff --git a/src/lib-imap-client/imapc-client-private.h b/src/lib-imap-client/imapc-client-private.h
new file mode 100644
index 0000000..98c4e8e
--- /dev/null
+++ b/src/lib-imap-client/imapc-client-private.h
@@ -0,0 +1,63 @@
+#ifndef IMAPC_CLIENT_PRIVATE_H
+#define IMAPC_CLIENT_PRIVATE_H
+
+#include "imapc-client.h"
+
+#define IMAPC_CLIENT_IDLE_SEND_DELAY_MSECS 100
+
+struct imapc_client_connection {
+	struct imapc_connection *conn;
+	struct imapc_client *client;
+	struct imapc_client_mailbox *box;
+};
+
+struct imapc_client {
+	pool_t pool;
+	int refcount;
+
+	struct event *event;
+	struct imapc_client_settings set;
+	struct ssl_iostream_context *ssl_ctx;
+
+	imapc_untagged_callback_t *untagged_callback;
+	void *untagged_context;
+
+	imapc_state_change_callback_t *state_change_callback;
+	void *state_change_context;
+
+	imapc_command_callback_t *login_callback;
+	void *login_context;
+
+	ARRAY(struct imapc_client_connection *) conns;
+	bool logging_out;
+
+	struct ioloop *ioloop;
+	bool stop_on_state_finish;
+};
+
+struct imapc_client_mailbox {
+	struct imapc_client *client;
+	struct imapc_connection *conn;
+	struct imapc_msgmap *msgmap;
+	struct timeout *to_send_idle;
+
+	void (*reopen_callback)(void *context);
+	void *reopen_context;
+
+	void *untagged_box_context;
+
+	bool reconnect_ok;
+	bool reconnecting;
+	bool closing;
+};
+
+extern unsigned int imapc_client_cmd_tag_counter;
+
+void imapc_client_ref(struct imapc_client *client);
+void imapc_client_unref(struct imapc_client **client);
+
+void imapc_command_set_mailbox(struct imapc_command *cmd,
+			       struct imapc_client_mailbox *box);
+void imapc_client_try_stop(struct imapc_client *client);
+
+#endif
diff --git a/src/lib-imap-client/imapc-client.c b/src/lib-imap-client/imapc-client.c
new file mode 100644
index 0000000..adb4dcb
--- /dev/null
+++ b/src/lib-imap-client/imapc-client.c
@@ -0,0 +1,584 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "str.h"
+#include "ioloop.h"
+#include "safe-mkstemp.h"
+#include "iostream-ssl.h"
+#include "imapc-msgmap.h"
+#include "imapc-connection.h"
+#include "imapc-client-private.h"
+
+#include <unistd.h>
+
+const char *imapc_command_state_names[] = {
+	"OK", "NO", "BAD", "(auth failed)", "(disconnected)"
+
+};
+
+const struct imapc_capability_name imapc_capability_names[] = {
+	{ "SASL-IR", IMAPC_CAPABILITY_SASL_IR },
+	{ "LITERAL+", IMAPC_CAPABILITY_LITERALPLUS },
+	{ "QRESYNC", IMAPC_CAPABILITY_QRESYNC },
+	{ "IDLE", IMAPC_CAPABILITY_IDLE },
+	{ "UIDPLUS", IMAPC_CAPABILITY_UIDPLUS },
+	{ "AUTH=PLAIN", IMAPC_CAPABILITY_AUTH_PLAIN },
+	{ "STARTTLS", IMAPC_CAPABILITY_STARTTLS },
+	{ "X-GM-EXT-1", IMAPC_CAPABILITY_X_GM_EXT_1 },
+	{ "CONDSTORE", IMAPC_CAPABILITY_CONDSTORE },
+	{ "NAMESPACE", IMAPC_CAPABILITY_NAMESPACE },
+	{ "UNSELECT", IMAPC_CAPABILITY_UNSELECT },
+	{ "ESEARCH", IMAPC_CAPABILITY_ESEARCH },
+	{ "WITHIN", IMAPC_CAPABILITY_WITHIN },
+	{ "QUOTA", IMAPC_CAPABILITY_QUOTA },
+	{ "ID", IMAPC_CAPABILITY_ID },
+	{ "SAVEDATE", IMAPC_CAPABILITY_SAVEDATE },
+
+	{ "IMAP4REV1", IMAPC_CAPABILITY_IMAP4REV1 },
+	{ NULL, 0 }
+};
+
+unsigned int imapc_client_cmd_tag_counter = 0;
+
+static void
+default_untagged_callback(const struct imapc_untagged_reply *reply ATTR_UNUSED,
+			  void *context ATTR_UNUSED)
+{
+}
+
+struct imapc_client *
+imapc_client_init(const struct imapc_client_settings *set,
+		  struct event *event_parent)
+{
+	struct imapc_client *client;
+	const char *error;
+	pool_t pool;
+
+	i_assert(set->connect_retry_count == 0 ||
+		 set->connect_retry_interval_msecs > 0);
+
+	pool = pool_alloconly_create("imapc client", 1024);
+	client = p_new(pool, struct imapc_client, 1);
+	client->pool = pool;
+	client->refcount = 1;
+	client->event = event_create(event_parent);
+
+	client->set.debug = set->debug;
+	client->set.host = p_strdup(pool, set->host);
+	client->set.port = set->port;
+	client->set.master_user = p_strdup_empty(pool, set->master_user);
+	client->set.username = p_strdup(pool, set->username);
+	client->set.password = p_strdup(pool, set->password);
+	client->set.sasl_mechanisms = p_strdup(pool, set->sasl_mechanisms);
+	client->set.session_id_prefix = p_strdup(pool, set->session_id_prefix);
+	client->set.use_proxyauth = set->use_proxyauth;
+	client->set.dns_client_socket_path =
+		p_strdup(pool, set->dns_client_socket_path);
+	client->set.temp_path_prefix =
+		p_strdup(pool, set->temp_path_prefix);
+	client->set.rawlog_dir = p_strdup(pool, set->rawlog_dir);
+	client->set.max_idle_time = set->max_idle_time;
+	client->set.connect_timeout_msecs = set->connect_timeout_msecs != 0 ?
+		set->connect_timeout_msecs :
+		IMAPC_DEFAULT_CONNECT_TIMEOUT_MSECS;
+	client->set.connect_retry_count = set->connect_retry_count;
+	client->set.connect_retry_interval_msecs = set->connect_retry_interval_msecs;
+	client->set.cmd_timeout_msecs = set->cmd_timeout_msecs != 0 ?
+		set->cmd_timeout_msecs : IMAPC_DEFAULT_COMMAND_TIMEOUT_MSECS;
+	client->set.max_line_length = set->max_line_length != 0 ?
+		set->max_line_length : IMAPC_DEFAULT_MAX_LINE_LENGTH;
+	client->set.throttle_set = set->throttle_set;
+
+	if (client->set.throttle_set.init_msecs == 0)
+		client->set.throttle_set.init_msecs = IMAPC_THROTTLE_DEFAULT_INIT_MSECS;
+	if (client->set.throttle_set.max_msecs == 0)
+		client->set.throttle_set.max_msecs = IMAPC_THROTTLE_DEFAULT_MAX_MSECS;
+	if (client->set.throttle_set.shrink_min_msecs == 0)
+		client->set.throttle_set.shrink_min_msecs = IMAPC_THROTTLE_DEFAULT_SHRINK_MIN_MSECS;
+
+	if (set->ssl_mode != IMAPC_CLIENT_SSL_MODE_NONE) {
+		client->set.ssl_mode = set->ssl_mode;
+		ssl_iostream_settings_init_from(pool, &client->set.ssl_set, &set->ssl_set);
+		client->set.ssl_set.verbose_invalid_cert = !client->set.ssl_set.allow_invalid_cert;
+		if (ssl_iostream_client_context_cache_get(&client->set.ssl_set,
+							  &client->ssl_ctx,
+							  &error) < 0) {
+			i_error("imapc(%s:%u): Couldn't initialize SSL context: %s",
+				set->host, set->port, error);
+		}
+	}
+	client->untagged_callback = default_untagged_callback;
+
+	p_array_init(&client->conns, pool, 8);
+	return client;
+}
+
+void imapc_client_ref(struct imapc_client *client)
+{
+	i_assert(client->refcount > 0);
+
+	client->refcount++;
+}
+
+void imapc_client_unref(struct imapc_client **_client)
+{
+	struct imapc_client *client = *_client;
+
+	*_client = NULL;
+
+	i_assert(client->refcount > 0);
+	if (--client->refcount > 0)
+		return;
+
+	if (client->ssl_ctx != NULL)
+		ssl_iostream_context_unref(&client->ssl_ctx);
+	event_unref(&client->event);
+	pool_unref(&client->pool);
+}
+
+void imapc_client_disconnect(struct imapc_client *client)
+{
+	struct imapc_client_connection *const *conns, *conn;
+	unsigned int i, count;
+
+	conns = array_get(&client->conns, &count);
+	for (i = count; i > 0; i--) {
+		conn = conns[i-1];
+		array_delete(&client->conns, i-1, 1);
+
+		i_assert(imapc_connection_get_mailbox(conn->conn) == NULL);
+		imapc_connection_deinit(&conn->conn);
+		i_free(conn);
+	}
+}
+
+void imapc_client_deinit(struct imapc_client **_client)
+{
+	struct imapc_client *client = *_client;
+
+	imapc_client_disconnect(client);
+	imapc_client_unref(_client);
+}
+
+void imapc_client_register_untagged(struct imapc_client *client,
+				    imapc_untagged_callback_t *callback,
+				    void *context)
+{
+	client->untagged_callback = callback;
+	client->untagged_context = context;
+}
+
+static void imapc_client_run_pre(struct imapc_client *client)
+{
+	struct imapc_client_connection *conn;
+	struct ioloop *prev_ioloop = current_ioloop;
+
+	i_assert(client->ioloop == NULL);
+
+	client->ioloop = io_loop_create();
+	io_loop_set_running(client->ioloop);
+
+	array_foreach_elem(&client->conns, conn) {
+		imapc_connection_ioloop_changed(conn->conn);
+		if (imapc_connection_get_state(conn->conn) == IMAPC_CONNECTION_STATE_DISCONNECTED)
+			imapc_connection_connect(conn->conn);
+	}
+
+	if (io_loop_is_running(client->ioloop))
+		io_loop_run(client->ioloop);
+	io_loop_set_current(prev_ioloop);
+}
+
+static void imapc_client_run_post(struct imapc_client *client)
+{
+	struct imapc_client_connection *conn;
+	struct ioloop *ioloop = client->ioloop;
+
+	client->ioloop = NULL;
+	array_foreach_elem(&client->conns, conn)
+		imapc_connection_ioloop_changed(conn->conn);
+
+	io_loop_set_current(ioloop);
+	io_loop_destroy(&ioloop);
+}
+
+void imapc_client_run(struct imapc_client *client)
+{
+	imapc_client_run_pre(client);
+	imapc_client_run_post(client);
+}
+
+void imapc_client_stop(struct imapc_client *client)
+{
+	if (client->ioloop != NULL)
+		io_loop_stop(client->ioloop);
+}
+
+void imapc_client_try_stop(struct imapc_client *client)
+{
+	struct imapc_client_connection *conn;
+	array_foreach_elem(&client->conns, conn)
+		if (imapc_connection_get_state(conn->conn) != IMAPC_CONNECTION_STATE_DISCONNECTED)
+			return;
+	imapc_client_stop(client);
+}
+
+bool imapc_client_is_running(struct imapc_client *client)
+{
+	return client->ioloop != NULL;
+}
+
+static void imapc_client_login_callback(const struct imapc_command_reply *reply,
+					void *context)
+{
+	struct imapc_client_connection *conn = context;
+	struct imapc_client *client = conn->client;
+	struct imapc_client_mailbox *box = conn->box;
+
+	if (box != NULL && box->reconnecting) {
+		box->reconnecting = FALSE;
+
+		if (reply->state == IMAPC_COMMAND_STATE_OK) {
+			/* reopen the mailbox */
+			box->reopen_callback(box->reopen_context);
+		} else {
+			imapc_connection_abort_commands(box->conn, NULL, FALSE);
+		}
+	}
+
+	/* call the login callback only once */
+	if (client->login_callback != NULL) {
+		imapc_command_callback_t *callback = client->login_callback;
+		void *context = client->login_context;
+
+		client->login_callback = NULL;
+		client->login_context = NULL;
+		callback(reply, context);
+	}
+}
+
+static struct imapc_client_connection *
+imapc_client_add_connection(struct imapc_client *client)
+{
+	struct imapc_client_connection *conn;
+
+	conn = i_new(struct imapc_client_connection, 1);
+	conn->client = client;
+	conn->conn = imapc_connection_init(client, imapc_client_login_callback,
+					   conn);
+	array_push_back(&client->conns, &conn);
+	return conn;
+}
+
+static struct imapc_connection *
+imapc_client_find_connection(struct imapc_client *client)
+{
+	struct imapc_client_connection *const *connp;
+
+	/* FIXME: stupid algorithm */
+	if (array_count(&client->conns) == 0)
+		return imapc_client_add_connection(client)->conn;
+	connp = array_front(&client->conns);
+	return (*connp)->conn;
+}
+
+struct imapc_command *
+imapc_client_cmd(struct imapc_client *client,
+		 imapc_command_callback_t *callback, void *context)
+{
+	struct imapc_connection *conn;
+
+	conn = imapc_client_find_connection(client);
+	return imapc_connection_cmd(conn, callback, context);
+}
+
+static struct imapc_client_connection *
+imapc_client_get_unboxed_connection(struct imapc_client *client)
+{
+	struct imapc_client_connection *const *conns;
+	unsigned int i, count;
+
+	conns = array_get(&client->conns, &count);
+	for (i = 0; i < count; i++) {
+		if (conns[i]->box == NULL)
+			return conns[i];
+	}
+	return imapc_client_add_connection(client);
+}
+
+
+void imapc_client_login(struct imapc_client *client)
+{
+	struct imapc_client_connection *conn;
+
+	i_assert(client->login_callback != NULL);
+	i_assert(array_count(&client->conns) == 0);
+
+	conn = imapc_client_add_connection(client);
+	imapc_connection_connect(conn->conn);
+}
+
+struct imapc_logout_ctx {
+	struct imapc_client *client;
+	unsigned int logout_count;
+};
+
+static void
+imapc_client_logout_callback(const struct imapc_command_reply *reply ATTR_UNUSED,
+			     void *context)
+{
+	struct imapc_logout_ctx *ctx = context;
+
+	i_assert(ctx->logout_count > 0);
+
+	if (--ctx->logout_count == 0)
+		imapc_client_stop(ctx->client);
+}
+
+void imapc_client_logout(struct imapc_client *client)
+{
+	struct imapc_logout_ctx ctx = { .client = client };
+	struct imapc_client_connection *conn;
+	struct imapc_command *cmd;
+
+	client->logging_out = TRUE;
+
+	/* send LOGOUT to all connections */
+	array_foreach_elem(&client->conns, conn) {
+		if (imapc_connection_get_state(conn->conn) == IMAPC_CONNECTION_STATE_DISCONNECTED)
+			continue;
+		imapc_connection_set_no_reconnect(conn->conn);
+		ctx.logout_count++;
+		cmd = imapc_connection_cmd(conn->conn,
+			imapc_client_logout_callback, &ctx);
+		imapc_command_set_flags(cmd, IMAPC_COMMAND_FLAG_PRELOGIN |
+					IMAPC_COMMAND_FLAG_LOGOUT);
+		imapc_command_send(cmd, "LOGOUT");
+	}
+
+	/* wait for LOGOUT to finish */
+	while (ctx.logout_count > 0)
+		imapc_client_run(client);
+
+	/* we should have disconnected all clients already, but if there were
+	   any timeouts there may be some clients left. */
+	imapc_client_disconnect(client);
+}
+
+struct imapc_client_mailbox *
+imapc_client_mailbox_open(struct imapc_client *client,
+			  void *untagged_box_context)
+{
+	struct imapc_client_mailbox *box;
+	struct imapc_client_connection *conn;
+
+	box = i_new(struct imapc_client_mailbox, 1);
+	box->client = client;
+	box->untagged_box_context = untagged_box_context;
+	conn = imapc_client_get_unboxed_connection(client);
+	conn->box = box;
+	box->conn = conn->conn;
+	box->msgmap = imapc_msgmap_init();
+	/* if we get disconnected before the SELECT is finished, allow
+	   one reconnect retry. */
+	box->reconnect_ok = TRUE;
+	return box;
+}
+
+void imapc_client_mailbox_set_reopen_cb(struct imapc_client_mailbox *box,
+					void (*callback)(void *context),
+					void *context)
+{
+	box->reopen_callback = callback;
+	box->reopen_context = context;
+}
+
+bool imapc_client_mailbox_can_reconnect(struct imapc_client_mailbox *box)
+{
+	/* the reconnect_ok flag attempts to avoid infinite reconnection loops
+	   to a server that keeps disconnecting us (e.g. some of the commands
+	   we send keeps crashing it always) */
+	return box->reopen_callback != NULL && box->reconnect_ok;
+}
+
+void imapc_client_mailbox_reconnect(struct imapc_client_mailbox *box,
+				    const char *errmsg)
+{
+	imapc_connection_try_reconnect(box->conn, errmsg, 0, FALSE);
+}
+
+void imapc_client_mailbox_close(struct imapc_client_mailbox **_box)
+{
+	struct imapc_client_mailbox *box = *_box;
+	struct imapc_client_connection *conn;
+
+	box->closing = TRUE;
+
+	/* cancel any pending commands */
+	imapc_connection_unselect(box);
+
+	if (box->reconnecting) {
+		/* need to abort the reconnection so it won't try to access
+		   the box */
+		imapc_connection_disconnect(box->conn);
+	}
+
+	/* set this only after unselect, which may cancel some commands that
+	   reference this box */
+	*_box = NULL;
+
+	array_foreach_elem(&box->client->conns, conn) {
+		if (conn->box == box) {
+			conn->box = NULL;
+			break;
+		}
+	}
+
+	imapc_msgmap_deinit(&box->msgmap);
+	timeout_remove(&box->to_send_idle);
+	i_free(box);
+}
+
+struct imapc_command *
+imapc_client_mailbox_cmd(struct imapc_client_mailbox *box,
+			 imapc_command_callback_t *callback, void *context)
+{
+	struct imapc_command *cmd;
+
+	i_assert(!box->closing);
+
+	cmd = imapc_connection_cmd(box->conn, callback, context);
+	imapc_command_set_mailbox(cmd, box);
+	return cmd;
+}
+
+struct imapc_msgmap *
+imapc_client_mailbox_get_msgmap(struct imapc_client_mailbox *box)
+{
+	return box->msgmap;
+}
+
+static void imapc_client_mailbox_idle_send(struct imapc_client_mailbox *box)
+{
+	timeout_remove(&box->to_send_idle);
+	if (imapc_client_mailbox_is_opened(box))
+		imapc_connection_idle(box->conn);
+}
+
+void imapc_client_mailbox_idle(struct imapc_client_mailbox *box)
+{
+	/* send the IDLE with a delay to avoid unnecessary IDLEs that are
+	   immediately aborted */
+	if (box->to_send_idle == NULL && imapc_client_mailbox_is_opened(box)) {
+		box->to_send_idle =
+			timeout_add_short(IMAPC_CLIENT_IDLE_SEND_DELAY_MSECS,
+					  imapc_client_mailbox_idle_send, box);
+	}
+	/* we're done with all work at this point. */
+	box->reconnect_ok = TRUE;
+}
+
+bool imapc_client_mailbox_is_opened(struct imapc_client_mailbox *box)
+{
+	struct imapc_client_mailbox *selected_box;
+
+	if (box->closing ||
+	    imapc_connection_get_state(box->conn) != IMAPC_CONNECTION_STATE_DONE)
+		return FALSE;
+
+	selected_box = imapc_connection_get_mailbox(box->conn);
+	if (selected_box != box) {
+		if (selected_box != NULL)
+			i_error("imapc: Selected mailbox changed unexpectedly");
+		return FALSE;
+	}
+	return TRUE;
+}
+
+static bool
+imapc_client_get_any_capabilities(struct imapc_client *client,
+				  enum imapc_capability *capabilities_r)
+{
+	struct imapc_client_connection *conn;
+
+	array_foreach_elem(&client->conns, conn) {
+		if (imapc_connection_get_state(conn->conn) == IMAPC_CONNECTION_STATE_DONE) {
+			*capabilities_r = imapc_connection_get_capabilities(conn->conn);
+			return TRUE;
+		}
+	}
+	return FALSE;
+}
+
+int imapc_client_get_capabilities(struct imapc_client *client,
+				  enum imapc_capability *capabilities_r)
+{
+	/* try to find a connection that is already logged in */
+	if (imapc_client_get_any_capabilities(client, capabilities_r))
+		return 0;
+
+	/* if there are no connections yet, create one */
+	if (array_count(&client->conns) == 0)
+		(void)imapc_client_add_connection(client);
+
+	/* wait for any of the connections to login */
+	client->stop_on_state_finish = TRUE;
+	imapc_client_run(client);
+	client->stop_on_state_finish = FALSE;
+	if (imapc_client_get_any_capabilities(client, capabilities_r))
+		return 0;
+
+	/* failed */
+	return -1;
+}
+
+int imapc_client_create_temp_fd(struct imapc_client *client,
+				const char **path_r)
+{
+	string_t *path;
+	int fd;
+
+	if (client->set.temp_path_prefix == NULL) {
+		i_error("imapc: temp_path_prefix not set, "
+			"can't create temp file");
+		return -1;
+	}
+
+	path = t_str_new(128);
+	str_append(path, client->set.temp_path_prefix);
+	fd = safe_mkstemp(path, 0600, (uid_t)-1, (gid_t)-1);
+	if (fd == -1) {
+		i_error("safe_mkstemp(%s) failed: %m", str_c(path));
+		return -1;
+	}
+
+	/* we just want the fd, unlink it */
+	if (i_unlink(str_c(path)) < 0) {
+		/* shouldn't happen.. */
+		i_close_fd(&fd);
+		return -1;
+	}
+	*path_r = str_c(path);
+	return fd;
+}
+
+void imapc_client_register_state_change_callback(struct imapc_client *client,
+						 imapc_state_change_callback_t *cb,
+						 void *context)
+{
+	i_assert(client->state_change_callback == NULL);
+	i_assert(client->state_change_context == NULL);
+
+	client->state_change_callback = cb;
+	client->state_change_context = context;
+}
+
+void
+imapc_client_set_login_callback(struct imapc_client *client,
+				imapc_command_callback_t *callback, void *context)
+{
+	client->login_callback = callback;
+	client->login_context  = context;
+}
+
diff --git a/src/lib-imap-client/imapc-client.h b/src/lib-imap-client/imapc-client.h
new file mode 100644
index 0000000..5c81be6
--- /dev/null
+++ b/src/lib-imap-client/imapc-client.h
@@ -0,0 +1,250 @@
+#ifndef IMAPC_CLIENT_H
+#define IMAPC_CLIENT_H
+
+#include "net.h"
+#include "iostream-ssl.h"
+
+/* IMAP RFC defines this to be at least 30 minutes. */
+#define IMAPC_DEFAULT_MAX_IDLE_TIME (60*29)
+
+enum imapc_command_state {
+	IMAPC_COMMAND_STATE_OK = 0,
+	IMAPC_COMMAND_STATE_NO,
+	IMAPC_COMMAND_STATE_BAD,
+	/* Authentication to IMAP server failed (NO or BAD) */
+	IMAPC_COMMAND_STATE_AUTH_FAILED,
+	/* Client was unexpectedly disconnected. */
+	IMAPC_COMMAND_STATE_DISCONNECTED
+};
+extern const char *imapc_command_state_names[];
+
+enum imapc_capability {
+	IMAPC_CAPABILITY_SASL_IR	= 0x01,
+	IMAPC_CAPABILITY_LITERALPLUS	= 0x02,
+	IMAPC_CAPABILITY_QRESYNC	= 0x04,
+	IMAPC_CAPABILITY_IDLE		= 0x08,
+	IMAPC_CAPABILITY_UIDPLUS	= 0x10,
+	IMAPC_CAPABILITY_AUTH_PLAIN	= 0x20,
+	IMAPC_CAPABILITY_STARTTLS	= 0x40,
+	IMAPC_CAPABILITY_X_GM_EXT_1	= 0x80,
+	IMAPC_CAPABILITY_CONDSTORE	= 0x100,
+	IMAPC_CAPABILITY_NAMESPACE	= 0x200,
+	IMAPC_CAPABILITY_UNSELECT	= 0x400,
+	IMAPC_CAPABILITY_ESEARCH	= 0x800,
+	IMAPC_CAPABILITY_WITHIN		= 0x1000,
+	IMAPC_CAPABILITY_QUOTA		= 0x2000,
+	IMAPC_CAPABILITY_ID		= 0x4000,
+	IMAPC_CAPABILITY_SAVEDATE	= 0x8000,
+
+	IMAPC_CAPABILITY_IMAP4REV1	= 0x40000000
+};
+struct imapc_capability_name {
+	const char *name;
+	enum imapc_capability capability;
+};
+extern const struct imapc_capability_name imapc_capability_names[];
+
+enum imapc_command_flags {
+	/* The command changes the selected mailbox (SELECT, EXAMINE) */
+	IMAPC_COMMAND_FLAG_SELECT	= 0x01,
+	/* The command is sent to server before login (or is the login
+	   command itself). Non-prelogin commands will be queued until login
+	   is successful. */
+	IMAPC_COMMAND_FLAG_PRELOGIN	= 0x02,
+	/* Allow command to be automatically retried if disconnected before it
+	   finishes. */
+	IMAPC_COMMAND_FLAG_RETRIABLE	= 0x04,
+	/* This is the LOGOUT command. Use a small timeout for it. */
+	IMAPC_COMMAND_FLAG_LOGOUT	= 0x08,
+	/* Command is being resent after a reconnection. */
+	IMAPC_COMMAND_FLAG_RECONNECTED	= 0x10
+};
+
+enum imapc_client_ssl_mode {
+	IMAPC_CLIENT_SSL_MODE_NONE,
+	IMAPC_CLIENT_SSL_MODE_IMMEDIATE,
+	IMAPC_CLIENT_SSL_MODE_STARTTLS
+};
+
+#define IMAPC_DEFAULT_CONNECT_TIMEOUT_MSECS (1000*30)
+#define IMAPC_DEFAULT_COMMAND_TIMEOUT_MSECS (1000*60*5)
+#define IMAPC_DEFAULT_MAX_LINE_LENGTH (SIZE_MAX)
+
+struct imapc_throttling_settings {
+	unsigned int init_msecs;
+	unsigned int max_msecs;
+	unsigned int shrink_min_msecs;
+};
+
+struct imapc_client_settings {
+	const char *host;
+	in_port_t port;
+
+	const char *master_user;
+	const char *username;
+	const char *password;
+	/* Space-separated list of SASL mechanisms to try (in the specified
+	   order). The default is to use only LOGIN command or SASL PLAIN. */
+	const char *sasl_mechanisms;
+	bool use_proxyauth; /* Use Sun/Oracle PROXYAUTH command */
+	unsigned int max_idle_time;
+	/* If ID capability is advertised, send a unique "x-session-ext-id",
+	   which begins with this prefix. */
+	const char *session_id_prefix;
+
+	const char *dns_client_socket_path;
+	const char *temp_path_prefix;
+	struct ssl_iostream_settings ssl_set;
+
+	enum imapc_client_ssl_mode ssl_mode;
+
+	const char *rawlog_dir;
+	bool debug;
+
+	/* Timeout for logging in. 0 = default. */
+	unsigned int connect_timeout_msecs;
+	/* Number of retries, -1 = infinity */
+	unsigned int connect_retry_count;
+	/* Interval between retries, must be > 0 if retries > 0 */
+	unsigned int connect_retry_interval_msecs;
+
+	/* Timeout for IMAP commands. Reset every time more data is being
+	   sent or received. 0 = default. */
+	unsigned int cmd_timeout_msecs;
+
+	/* Maximum allowed line length (not including literals read as
+	   streams). 0 = unlimited. */
+	size_t max_line_length;
+
+	struct imapc_throttling_settings throttle_set;
+};
+
+struct imapc_command_reply {
+	enum imapc_command_state state;
+	/* "[RESP TEXT]" produces key=RESP, value=TEXT.
+	   "[RESP]" produces key=RESP, value=NULL
+	   otherwise both are NULL */
+	const char *resp_text_key, *resp_text_value;
+	/* The full tagged reply, including [RESP TEXT]. */
+	const char *text_full;
+	/* Tagged reply text without [RESP TEXT] */
+	const char *text_without_resp;
+};
+
+struct imapc_arg_file {
+	/* file descriptor containing the value */
+	int fd;
+
+	/* parent_arg.list[list_idx] points to the IMAP_ARG_LITERAL_SIZE
+	   argument */
+	const struct imap_arg *parent_arg;
+	unsigned int list_idx;
+};
+
+struct imapc_untagged_reply {
+	/* name of the untagged reply, e.g. EXISTS */
+	const char *name;
+	/* number at the beginning of the reply, or 0 if there wasn't any.
+	   Set for EXISTS, EXPUNGE, etc. */
+	uint32_t num;
+	/* the rest of the reply can be read from these args. */
+	const struct imap_arg *args;
+	/* arguments whose contents are stored into files. only
+	   "FETCH (BODY[" arguments can be here. */
+	const struct imapc_arg_file *file_args;
+	unsigned int file_args_count;
+
+	/* "* OK [RESP TEXT]" produces key=RESP, value=TEXT.
+	   "* OK [RESP]" produces key=RESP, value=NULL
+	   otherwise both are NULL */
+	const char *resp_text_key, *resp_text_value;
+
+	/* If this reply occurred while a mailbox was selected, this contains
+	   the mailbox's untagged_context. */
+	void *untagged_box_context;
+};
+
+enum imapc_state_change_event {
+	IMAPC_STATE_CHANGE_AUTH_OK,
+	IMAPC_STATE_CHANGE_AUTH_FAILED,
+};
+
+/* Called when tagged reply is received for command. */
+typedef void imapc_command_callback_t(const struct imapc_command_reply *reply,
+				      void *context);
+/* Called each time untagged input is received. */
+typedef void imapc_untagged_callback_t(const struct imapc_untagged_reply *reply,
+				       void *context);
+typedef void imapc_state_change_callback_t(void *context,
+					   enum imapc_state_change_event event,
+					   const char *error);
+
+struct imapc_client *
+imapc_client_init(const struct imapc_client_settings *set,
+		  struct event *event_parent);
+void imapc_client_disconnect(struct imapc_client *client);
+void imapc_client_deinit(struct imapc_client **client);
+
+/* Set login callback, must be set before calling other commands.
+   This is called only for the first login, not for any reconnects or if there
+   are multiple connections created. */
+void
+imapc_client_set_login_callback(struct imapc_client *client,
+				imapc_command_callback_t *callback, void *context);
+/* Explicitly login to server (also done automatically). */
+void imapc_client_login(struct imapc_client *client);
+/* Send a LOGOUT and wait for disconnection. */
+void imapc_client_logout(struct imapc_client *client);
+
+struct imapc_command *
+imapc_client_cmd(struct imapc_client *client,
+		 imapc_command_callback_t *callback, void *context);
+void imapc_command_set_flags(struct imapc_command *cmd,
+			     enum imapc_command_flags flags);
+bool imapc_command_connection_is_selected(struct imapc_command *cmd);
+void imapc_command_send(struct imapc_command *cmd, const char *cmd_str);
+void imapc_command_sendf(struct imapc_command *cmd, const char *cmd_fmt, ...)
+	ATTR_FORMAT(2, 3);
+void imapc_command_sendvf(struct imapc_command *cmd,
+			  const char *cmd_fmt, va_list args) ATTR_FORMAT(2, 0);
+const char *imapc_command_get_tag(struct imapc_command *cmd);
+void imapc_command_abort(struct imapc_command **cmd);
+
+void imapc_client_register_untagged(struct imapc_client *client,
+				    imapc_untagged_callback_t *callback,
+				    void *context);
+
+void imapc_client_run(struct imapc_client *client);
+void imapc_client_stop(struct imapc_client *client);
+bool imapc_client_is_running(struct imapc_client *client);
+
+struct imapc_client_mailbox *
+imapc_client_mailbox_open(struct imapc_client *client,
+			  void *untagged_box_context);
+void imapc_client_mailbox_set_reopen_cb(struct imapc_client_mailbox *box,
+					void (*callback)(void *context),
+					void *context);
+void imapc_client_mailbox_close(struct imapc_client_mailbox **box);
+bool imapc_client_mailbox_can_reconnect(struct imapc_client_mailbox *box);
+void imapc_client_mailbox_reconnect(struct imapc_client_mailbox *box,
+				    const char *errmsg);
+struct imapc_command *
+imapc_client_mailbox_cmd(struct imapc_client_mailbox *box,
+			 imapc_command_callback_t *callback, void *context);
+struct imapc_msgmap *
+imapc_client_mailbox_get_msgmap(struct imapc_client_mailbox *box);
+
+void imapc_client_mailbox_idle(struct imapc_client_mailbox *box);
+bool imapc_client_mailbox_is_opened(struct imapc_client_mailbox *box);
+
+int imapc_client_get_capabilities(struct imapc_client *client,
+				  enum imapc_capability *capabilities_r);
+
+int imapc_client_create_temp_fd(struct imapc_client *client,
+				const char **path_r);
+
+void imapc_client_register_state_change_callback(struct imapc_client *client,
+						 imapc_state_change_callback_t *cb,
+						 void *context);
+
+#endif
diff --git a/src/lib-imap-client/imapc-connection.c b/src/lib-imap-client/imapc-connection.c
new file mode 100644
index 0000000..5730f94
--- /dev/null
+++ b/src/lib-imap-client/imapc-connection.c
@@ -0,0 +1,2513 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "net.h"
+#include "istream.h"
+#include "ostream.h"
+#include "base64.h"
+#include "write-full.h"
+#include "str.h"
+#include "time-util.h"
+#include "dns-lookup.h"
+#include "dsasl-client.h"
+#include "iostream-rawlog.h"
+#include "iostream-ssl.h"
+#include "imap-quote.h"
+#include "imap-util.h"
+#include "imap-parser.h"
+#include "imapc-client-private.h"
+#include "imapc-connection.h"
+
+#include <unistd.h>
+#include <ctype.h>
+
+#define IMAPC_COMMAND_STATE_AUTHENTICATE_CONTINUE 10000
+#define IMAPC_MAX_INLINE_LITERAL_SIZE (1024*32)
+/* If LOGOUT reply takes longer than this, disconnect. */
+#define IMAPC_LOGOUT_TIMEOUT_MSECS 5000
+
+enum imapc_input_state {
+	IMAPC_INPUT_STATE_NONE = 0,
+	IMAPC_INPUT_STATE_PLUS,
+	IMAPC_INPUT_STATE_UNTAGGED,
+	IMAPC_INPUT_STATE_UNTAGGED_NUM,
+	IMAPC_INPUT_STATE_TAGGED
+};
+
+struct imapc_command_stream {
+	unsigned int pos;
+	uoff_t size;
+	struct istream *input;
+};
+
+struct imapc_command {
+	pool_t pool;
+	buffer_t *data;
+	unsigned int send_pos;
+	unsigned int tag;
+
+	enum imapc_command_flags flags;
+	struct imapc_connection *conn;
+	/* If non-NULL, points to the mailbox where this command should be
+	   executed */
+	struct imapc_client_mailbox *box;
+
+	ARRAY(struct imapc_command_stream) streams;
+
+	imapc_command_callback_t *callback;
+	void *context;
+
+	/* This is the AUTHENTICATE command */
+	bool authenticate:1;
+	/* This is the IDLE command */
+	bool idle:1;
+	/* Waiting for '+' literal reply before we can continue */
+	bool wait_for_literal:1;
+	/* Command is fully sent to server */
+	bool sent:1;
+};
+ARRAY_DEFINE_TYPE(imapc_command, struct imapc_command *);
+
+struct imapc_connection_literal {
+	char *temp_path;
+	int fd;
+	uoff_t bytes_left;
+
+	const struct imap_arg *parent_arg;
+	unsigned int list_idx;
+};
+
+struct imapc_connection {
+	struct imapc_client *client;
+	char *name;
+	int refcount;
+
+	int fd;
+	struct io *io;
+	struct istream *input, *raw_input;
+	struct ostream *output, *raw_output;
+	struct imap_parser *parser;
+	struct timeout *to;
+	struct timeout *to_output;
+	struct dns_lookup *dns_lookup;
+	struct dsasl_client *sasl_client;
+
+	struct ssl_iostream *ssl_iostream;
+
+	int (*input_callback)(struct imapc_connection *conn);
+	enum imapc_input_state input_state;
+	unsigned int cur_tag;
+	uint32_t cur_num;
+	struct timeval last_connect;
+	unsigned int reconnect_count;
+
+	struct imapc_client_mailbox *selecting_box, *selected_box;
+	enum imapc_connection_state state;
+	char *disconnect_reason;
+
+	enum imapc_capability capabilities;
+	char **capabilities_list;
+
+	imapc_command_callback_t *login_callback;
+	void *login_context;
+
+	/* commands pending in queue to be sent */
+	ARRAY_TYPE(imapc_command) cmd_send_queue;
+	/* commands that have been sent, waiting for their tagged reply */
+	ARRAY_TYPE(imapc_command) cmd_wait_list;
+	/* commands that were already sent, but were aborted since (due to
+	   unselecting mailbox). */
+	ARRAY_TYPE(seq_range) aborted_cmd_tags;
+	unsigned int reconnect_command_count;
+
+	unsigned int ips_count, prev_connect_idx;
+	struct ip_addr *ips;
+
+	struct imapc_connection_literal literal;
+	ARRAY(struct imapc_arg_file) literal_files;
+
+	unsigned int throttle_msecs;
+	unsigned int throttle_shrink_msecs;
+	unsigned int last_successful_throttle_msecs;
+	bool throttle_pending;
+	struct timeval throttle_end_timeval;
+	struct timeout *to_throttle, *to_throttle_shrink;
+
+	bool reconnecting:1;
+	bool reconnect_waiting:1;
+	bool reconnect_ok:1;
+	bool idling:1;
+	bool idle_stopping:1;
+	bool idle_plus_waiting:1;
+	bool select_waiting_reply:1;
+};
+
+static void imapc_connection_capability_cb(const struct imapc_command_reply *reply,
+					   void *context);
+static int imapc_connection_output(struct imapc_connection *conn);
+static int imapc_connection_ssl_init(struct imapc_connection *conn);
+static void imapc_command_free(struct imapc_command *cmd);
+static void imapc_command_send_more(struct imapc_connection *conn);
+static void
+imapc_login_callback(struct imapc_connection *conn,
+		     const struct imapc_command_reply *reply);
+
+static void
+imapc_auth_ok(struct imapc_connection *conn)
+{
+	if (conn->client->set.debug)
+		i_debug("imapc(%s): Authenticated successfully", conn->name);
+
+	if (conn->client->state_change_callback == NULL)
+		return;
+
+	conn->client->state_change_callback(conn->client->state_change_context,
+					    IMAPC_STATE_CHANGE_AUTH_OK, NULL);
+}
+
+static void
+imapc_auth_failed(struct imapc_connection *conn, const struct imapc_command_reply *_reply,
+		  const char *error)
+{
+	struct imapc_command_reply reply = *_reply;
+
+	reply.text_without_resp = reply.text_full =
+		t_strdup_printf("Authentication failed: %s", error);
+	if (reply.state != IMAPC_COMMAND_STATE_DISCONNECTED) {
+		reply.state = IMAPC_COMMAND_STATE_AUTH_FAILED;
+		i_error("imapc(%s): %s", conn->name, reply.text_full);
+	}
+	imapc_login_callback(conn, &reply);
+
+	if (conn->client->state_change_callback == NULL)
+		return;
+
+	conn->client->state_change_callback(conn->client->state_change_context,
+					    IMAPC_STATE_CHANGE_AUTH_FAILED,
+					    error);
+}
+
+struct imapc_connection *
+imapc_connection_init(struct imapc_client *client,
+		      imapc_command_callback_t *login_callback,
+		      void *login_context)
+{
+	struct imapc_connection *conn;
+
+	conn = i_new(struct imapc_connection, 1);
+	conn->refcount = 1;
+	conn->client = client;
+	conn->login_callback = login_callback;
+	conn->login_context = login_context;
+	conn->fd = -1;
+	conn->name = i_strdup_printf("%s:%u", client->set.host,
+				     client->set.port);
+	conn->literal.fd = -1;
+	conn->reconnect_ok = (client->set.connect_retry_count>0);
+	i_array_init(&conn->cmd_send_queue, 8);
+	i_array_init(&conn->cmd_wait_list, 32);
+	i_array_init(&conn->literal_files, 4);
+	i_array_init(&conn->aborted_cmd_tags, 8);
+
+	if (client->set.debug)
+		i_debug("imapc(%s): Created new connection", conn->name);
+
+	imapc_client_ref(client);
+	return conn;
+}
+
+static void imapc_connection_ref(struct imapc_connection *conn)
+{
+	i_assert(conn->refcount > 0);
+
+	conn->refcount++;
+}
+
+static void imapc_connection_unref(struct imapc_connection **_conn)
+{
+	struct imapc_connection *conn = *_conn;
+
+	i_assert(conn->refcount > 0);
+
+	*_conn = NULL;
+	if (--conn->refcount > 0)
+		return;
+
+	i_assert(conn->disconnect_reason == NULL);
+
+	if (conn->capabilities_list != NULL)
+		p_strsplit_free(default_pool, conn->capabilities_list);
+	array_free(&conn->cmd_send_queue);
+	array_free(&conn->cmd_wait_list);
+	array_free(&conn->literal_files);
+	array_free(&conn->aborted_cmd_tags);
+	imapc_client_unref(&conn->client);
+	i_free(conn->ips);
+	i_free(conn->name);
+	i_free(conn);
+}
+
+void imapc_connection_deinit(struct imapc_connection **_conn)
+{
+	imapc_connection_disconnect(*_conn);
+	imapc_connection_unref(_conn);
+}
+
+void imapc_connection_ioloop_changed(struct imapc_connection *conn)
+{
+	if (conn->io != NULL)
+		conn->io = io_loop_move_io(&conn->io);
+	if (conn->to != NULL)
+		conn->to = io_loop_move_timeout(&conn->to);
+	if (conn->to_throttle != NULL)
+		conn->to_throttle = io_loop_move_timeout(&conn->to_throttle);
+	if (conn->to_throttle_shrink != NULL)
+		conn->to_throttle_shrink = io_loop_move_timeout(&conn->to_throttle_shrink);
+	if (conn->output != NULL)
+		o_stream_switch_ioloop(conn->output);
+	if (conn->dns_lookup != NULL)
+		dns_lookup_switch_ioloop(conn->dns_lookup);
+
+	if (conn->client->ioloop == NULL && conn->to_output != NULL) {
+		/* we're only once moving the to_output to the main ioloop,
+		   since timeout moves currently also reset the timeout.
+		   (the rest of the times this is a no-op) */
+		conn->to_output = io_loop_move_timeout(&conn->to_output);
+	}
+}
+
+static const char *imapc_command_get_readable(struct imapc_command *cmd)
+{
+	string_t *str = t_str_new(256);
+	const unsigned char *data = cmd->data->data;
+	unsigned int i;
+
+	for (i = 0; i < cmd->data->used; i++) {
+		if (data[i] != '\r' && data[i] != '\n')
+			str_append_c(str, data[i]);
+	}
+	return str_c(str);
+}
+
+static void
+imapc_connection_abort_commands_array(ARRAY_TYPE(imapc_command) *cmd_array,
+				      ARRAY_TYPE(imapc_command) *dest_array,
+				      struct imapc_client_mailbox *only_box,
+				      bool keep_retriable)
+{
+	struct imapc_command *cmd;
+	unsigned int i;
+
+	for (i = 0; i < array_count(cmd_array); ) {
+		cmd = array_idx_elem(cmd_array, i);
+
+		if (cmd->box != only_box && only_box != NULL)
+			i++;
+		else if (keep_retriable &&
+			 (cmd->flags & IMAPC_COMMAND_FLAG_RETRIABLE) != 0) {
+			cmd->send_pos = 0;
+			cmd->wait_for_literal = 0;
+			cmd->flags |= IMAPC_COMMAND_FLAG_RECONNECTED;
+			i++;
+		} else {
+			array_delete(cmd_array, i, 1);
+			array_push_back(dest_array, &cmd);
+		}
+	}
+}
+
+void imapc_connection_abort_commands(struct imapc_connection *conn,
+				     struct imapc_client_mailbox *only_box,
+				     bool keep_retriable)
+{
+	struct imapc_command *cmd;
+	ARRAY_TYPE(imapc_command) tmp_array;
+	struct imapc_command_reply reply;
+
+	t_array_init(&tmp_array, 8);
+	imapc_connection_abort_commands_array(&conn->cmd_wait_list, &tmp_array,
+					      only_box, keep_retriable);
+	imapc_connection_abort_commands_array(&conn->cmd_send_queue, &tmp_array,
+					      only_box, keep_retriable);
+
+	if (array_count(&conn->cmd_wait_list) > 0 && only_box == NULL) {
+		/* need to move all the waiting commands to send queue */
+		array_append_array(&conn->cmd_wait_list,
+				   &conn->cmd_send_queue);
+		array_clear(&conn->cmd_send_queue);
+		array_append_array(&conn->cmd_send_queue,
+				   &conn->cmd_wait_list);
+		array_clear(&conn->cmd_wait_list);
+	}
+
+	/* abort the commands. we'll do it here later so that if the
+	   callback recurses us back here we don't crash */
+	i_zero(&reply);
+	reply.state = IMAPC_COMMAND_STATE_DISCONNECTED;
+	if (only_box != NULL) {
+		reply.text_without_resp = reply.text_full =
+			"Unselecting mailbox";
+	} else {
+		reply.text_without_resp = reply.text_full =
+			"Disconnected from server";
+	}
+	array_foreach_elem(&tmp_array, cmd) {
+		if (cmd->sent && conn->state == IMAPC_CONNECTION_STATE_DONE) {
+			/* We're not disconnected, so the reply will still
+			   come. Remember that it needs to be ignored. */
+			seq_range_array_add(&conn->aborted_cmd_tags, cmd->tag);
+		}
+		cmd->callback(&reply, cmd->context);
+		imapc_command_free(cmd);
+	}
+	if (array_count(&conn->cmd_wait_list) == 0)
+		timeout_remove(&conn->to);
+}
+
+static void
+imapc_login_callback(struct imapc_connection *conn,
+		     const struct imapc_command_reply *reply)
+{
+	if (conn->login_callback != NULL)
+		conn->login_callback(reply, conn->login_context);
+}
+
+static void imapc_connection_set_state(struct imapc_connection *conn,
+				       enum imapc_connection_state state)
+{
+	struct imapc_command_reply reply;
+
+	conn->state = state;
+
+	switch (state) {
+	case IMAPC_CONNECTION_STATE_DISCONNECTED:
+		i_zero(&reply);
+		reply.state = IMAPC_COMMAND_STATE_DISCONNECTED;
+		reply.text_full = "Disconnected from server";
+		if (conn->disconnect_reason != NULL) {
+			reply.text_full = t_strdup_printf("%s: %s",
+				reply.text_full, conn->disconnect_reason);
+			i_free_and_null(conn->disconnect_reason);
+		}
+		reply.text_without_resp = reply.text_full;
+		if (!conn->reconnecting) {
+			imapc_login_callback(conn, &reply);
+			i_free(conn->ips);
+			conn->ips_count = 0;
+		}
+		array_clear(&conn->aborted_cmd_tags);
+		conn->idling = FALSE;
+		conn->idle_plus_waiting = FALSE;
+		conn->idle_stopping = FALSE;
+
+		conn->select_waiting_reply = FALSE;
+		conn->selecting_box = NULL;
+		conn->selected_box = NULL;
+		/* fall through */
+	case IMAPC_CONNECTION_STATE_DONE:
+		/* if we came from imapc_client_get_capabilities(), stop so
+		   it can finish up and not just hang indefinitely. */
+		if (conn->client->stop_on_state_finish && !conn->reconnecting)
+			imapc_client_stop(conn->client);
+		break;
+	default:
+		break;
+	}
+}
+
+static void imapc_connection_lfiles_free(struct imapc_connection *conn)
+{
+	struct imapc_arg_file *lfile;
+
+	array_foreach_modifiable(&conn->literal_files, lfile) {
+		if (close(lfile->fd) < 0)
+			i_error("imapc: close(literal file) failed: %m");
+	}
+	array_clear(&conn->literal_files);
+}
+
+static void
+imapc_connection_literal_reset(struct imapc_connection_literal *literal)
+{
+	i_close_fd_path(&literal->fd, literal->temp_path);
+	i_free_and_null(literal->temp_path);
+
+	i_zero(literal);
+	literal->fd = -1;
+}
+
+void imapc_connection_disconnect_full(struct imapc_connection *conn,
+				      bool reconnecting)
+{
+	/* timeout may be set also in disconnected state */
+	timeout_remove(&conn->to);
+	conn->reconnecting = reconnecting;
+
+	if (conn->state == IMAPC_CONNECTION_STATE_DISCONNECTED) {
+		i_assert(array_count(&conn->cmd_wait_list) == 0);
+		return;
+	}
+
+	if (conn->client->set.debug)
+		i_debug("imapc(%s): Disconnected", conn->name);
+
+	if (conn->dns_lookup != NULL)
+		dns_lookup_abort(&conn->dns_lookup);
+	imapc_connection_lfiles_free(conn);
+	imapc_connection_literal_reset(&conn->literal);
+	timeout_remove(&conn->to_output);
+	timeout_remove(&conn->to_throttle);
+	timeout_remove(&conn->to_throttle_shrink);
+	if (conn->parser != NULL)
+		imap_parser_unref(&conn->parser);
+	io_remove(&conn->io);
+	ssl_iostream_destroy(&conn->ssl_iostream);
+	if (conn->fd != -1) {
+		i_stream_destroy(&conn->input);
+		o_stream_destroy(&conn->output);
+		net_disconnect(conn->fd);
+		conn->fd = -1;
+	}
+
+	/* get capabilities again after reconnection. this is especially
+	   important because post-login capabilities often do not contain AUTH=
+	   capabilities. */
+	conn->capabilities = 0;
+	if (conn->capabilities_list != NULL) {
+		p_strsplit_free(default_pool, conn->capabilities_list);
+		conn->capabilities_list = NULL;
+	}
+
+	imapc_connection_set_state(conn, IMAPC_CONNECTION_STATE_DISCONNECTED);
+	imapc_connection_abort_commands(conn, NULL, reconnecting);
+
+	if (!reconnecting) {
+		imapc_client_try_stop(conn->client);
+	}
+}
+
+void imapc_connection_set_no_reconnect(struct imapc_connection *conn)
+{
+	conn->reconnect_ok = FALSE;
+}
+
+void imapc_connection_disconnect(struct imapc_connection *conn)
+{
+	imapc_connection_disconnect_full(conn, FALSE);
+}
+
+static void imapc_connection_set_disconnected(struct imapc_connection *conn)
+{
+	imapc_connection_set_state(conn, IMAPC_CONNECTION_STATE_DISCONNECTED);
+	imapc_connection_abort_commands(conn, NULL, FALSE);
+}
+
+static bool imapc_connection_can_reconnect(struct imapc_connection *conn)
+{
+	if (conn->client->logging_out)
+		return FALSE;
+	if (conn->client->set.connect_retry_count == 0 ||
+	    (conn->client->set.connect_retry_count < UINT_MAX &&
+	     conn->reconnect_count >= conn->client->set.connect_retry_count))
+		return FALSE;
+
+	if (conn->selected_box != NULL)
+		return imapc_client_mailbox_can_reconnect(conn->selected_box);
+	else {
+		return conn->reconnect_command_count == 0 &&
+			conn->reconnect_ok;
+	}
+}
+
+static void imapc_connection_reconnect(struct imapc_connection *conn)
+{
+	conn->reconnect_ok = FALSE;
+	conn->reconnect_waiting = FALSE;
+
+	if (conn->selected_box != NULL) {
+		i_assert(!conn->selected_box->reconnecting);
+		conn->selected_box->reconnecting = TRUE;
+		/* if we fail again, avoid reconnecting immediately. if the
+		   server is broken we could just get into an infinitely
+		   failing reconnection loop. */
+		conn->selected_box->reconnect_ok = FALSE;
+	}
+	imapc_connection_disconnect_full(conn, TRUE);
+	imapc_connection_connect(conn);
+}
+
+void imapc_connection_try_reconnect(struct imapc_connection *conn,
+				    const char *errstr,
+				    unsigned int delay_msecs,
+				    bool connect_error)
+{
+	/* Try the next IP address only for connect() problems. */
+	if (conn->prev_connect_idx + 1 < conn->ips_count && connect_error) {
+		i_warning("imapc(%s): %s - trying the next IP", conn->name, errstr);
+		conn->reconnect_ok = TRUE;
+		imapc_connection_disconnect_full(conn, TRUE);
+		imapc_connection_connect(conn);
+		return;
+	}
+
+	if (!imapc_connection_can_reconnect(conn)) {
+		i_error("imapc(%s): %s - disconnecting", conn->name, errstr);
+		imapc_connection_disconnect(conn);
+	} else {
+		conn->reconnecting = TRUE;
+		i_warning("imapc(%s): %s - reconnecting (delay %u ms)", conn->name, errstr, delay_msecs);
+		if (delay_msecs == 0)
+			imapc_connection_reconnect(conn);
+		else {
+			imapc_connection_disconnect_full(conn, TRUE);
+			conn->to = timeout_add(delay_msecs, imapc_connection_reconnect, conn);
+			conn->reconnect_count++;
+			conn->reconnect_waiting = TRUE;
+		}
+	}
+}
+
+static void ATTR_FORMAT(2, 3)
+imapc_connection_input_error(struct imapc_connection *conn,
+			     const char *fmt, ...)
+{
+	va_list va;
+
+	va_start(va, fmt);
+	i_error("imapc(%s): Server sent invalid input: %s",
+		conn->name, t_strdup_vprintf(fmt, va));
+	imapc_connection_disconnect(conn);
+	va_end(va);
+}
+
+static bool last_arg_is_fetch_body(const struct imap_arg *args,
+				   const struct imap_arg **parent_arg_r,
+				   unsigned int *idx_r)
+{
+	const struct imap_arg *list;
+	const char *name;
+	unsigned int count;
+
+	if (args[0].type == IMAP_ARG_ATOM &&
+	    imap_arg_atom_equals(&args[1], "FETCH") &&
+	    imap_arg_get_list_full(&args[2], &list, &count) && count >= 2 &&
+	    list[count].type == IMAP_ARG_LITERAL_SIZE &&
+	    imap_arg_get_atom(&list[count-1], &name) &&
+	    strncasecmp(name, "BODY[", 5) == 0) {
+		*parent_arg_r = &args[2];
+		*idx_r = count;
+		return TRUE;
+	}
+	return FALSE;
+}
+
+static int
+imapc_connection_read_literal_init(struct imapc_connection *conn, uoff_t size,
+				   const struct imap_arg *args)
+{
+	const char *path;
+	const struct imap_arg *parent_arg;
+	unsigned int idx;
+
+	i_assert(conn->literal.fd == -1);
+
+	if (size <= IMAPC_MAX_INLINE_LITERAL_SIZE ||
+	    !last_arg_is_fetch_body(args, &parent_arg, &idx)) {
+		/* read the literal directly into parser */
+		return 0;
+	}
+
+	conn->literal.fd = imapc_client_create_temp_fd(conn->client, &path);
+	if (conn->literal.fd == -1)
+		return -1;
+	conn->literal.temp_path = i_strdup(path);
+	conn->literal.bytes_left = size;
+	conn->literal.parent_arg = parent_arg;
+	conn->literal.list_idx = idx;
+	return 1;
+}
+
+static int imapc_connection_read_literal(struct imapc_connection *conn)
+{
+	struct imapc_arg_file *lfile;
+	const unsigned char *data;
+	size_t size;
+
+	if (conn->literal.bytes_left == 0)
+		return 1;
+
+	data = i_stream_get_data(conn->input, &size);
+	if (size > conn->literal.bytes_left)
+		size = conn->literal.bytes_left;
+	if (size > 0) {
+		if (write_full(conn->literal.fd, data, size) < 0) {
+			i_error("imapc(%s): write(%s) failed: %m",
+				conn->name, conn->literal.temp_path);
+			imapc_connection_disconnect(conn);
+			return -1;
+		}
+		i_stream_skip(conn->input, size);
+		conn->literal.bytes_left -= size;
+	}
+	if (conn->literal.bytes_left > 0)
+		return 0;
+
+	/* finished */
+	lfile = array_append_space(&conn->literal_files);
+	lfile->fd = conn->literal.fd;
+	lfile->parent_arg = conn->literal.parent_arg;
+	lfile->list_idx = conn->literal.list_idx;
+
+	conn->literal.fd = -1;
+	imapc_connection_literal_reset(&conn->literal);
+	return 1;
+}
+
+static int
+imapc_connection_read_line_more(struct imapc_connection *conn,
+				const struct imap_arg **imap_args_r)
+{
+	uoff_t literal_size;
+	int ret;
+
+	if ((ret = imapc_connection_read_literal(conn)) <= 0)
+		return ret;
+
+	ret = imap_parser_read_args(conn->parser, 0,
+				    IMAP_PARSE_FLAG_LITERAL_SIZE |
+				    IMAP_PARSE_FLAG_ATOM_ALLCHARS |
+				    IMAP_PARSE_FLAG_LITERAL8 |
+				    IMAP_PARSE_FLAG_SERVER_TEXT, imap_args_r);
+	if (ret == -2) {
+		/* need more data */
+		return 0;
+	}
+	if (ret < 0) {
+		enum imap_parser_error parser_error;
+		const char *err_msg = imap_parser_get_error(conn->parser, &parser_error);
+		if (parser_error != IMAP_PARSE_ERROR_BAD_SYNTAX)
+			imapc_connection_input_error(conn, "Error parsing input: %s", err_msg);
+		else
+			i_error("Error parsing input: %s", err_msg);
+		return -1;
+	}
+
+	if (imap_parser_get_literal_size(conn->parser, &literal_size)) {
+		if (imapc_connection_read_literal_init(conn, literal_size,
+						       *imap_args_r) <= 0) {
+			imap_parser_read_last_literal(conn->parser);
+			return 2;
+		}
+		return imapc_connection_read_line_more(conn, imap_args_r);
+	}
+	return 1;
+}
+
+static int
+imapc_connection_read_line(struct imapc_connection *conn,
+			   const struct imap_arg **imap_args_r)
+{
+	const unsigned char *data;
+	size_t size;
+	int ret;
+
+	while ((ret = imapc_connection_read_line_more(conn, imap_args_r)) == 2)
+		;
+
+	if (ret > 0) {
+		data = i_stream_get_data(conn->input, &size);
+		if (size >= 2 && data[0] == '\r' && data[1] == '\n')
+			i_stream_skip(conn->input, 2);
+		else if (size >= 1 && data[0] == '\n')
+			i_stream_skip(conn->input, 1);
+		else
+			i_panic("imapc: Missing LF from input line");
+	} else if (ret < 0) {
+		data = i_stream_get_data(conn->input, &size);
+		unsigned char *lf = memchr(data, '\n', size);
+		if (lf != NULL)
+			i_stream_skip(conn->input, (lf - data) + 1);
+	}
+	return ret;
+}
+
+static int
+imapc_connection_parse_capability(struct imapc_connection *conn,
+				  const char *value)
+{
+	const char *const *tmp;
+	unsigned int i;
+
+	if (conn->client->set.debug) {
+		i_debug("imapc(%s): Server capabilities: %s",
+			conn->name, value);
+	}
+
+	conn->capabilities = 0;
+	if (conn->capabilities_list != NULL)
+		p_strsplit_free(default_pool, conn->capabilities_list);
+	conn->capabilities_list = p_strsplit(default_pool, value, " ");
+
+	for (tmp = t_strsplit(value, " "); *tmp != NULL; tmp++) {
+		for (i = 0; imapc_capability_names[i].name != NULL; i++) {
+			const struct imapc_capability_name *cap =
+				&imapc_capability_names[i];
+
+			if (strcasecmp(*tmp, cap->name) == 0) {
+				conn->capabilities |= cap->capability;
+				break;
+			}
+		}
+	}
+
+	if ((conn->capabilities & IMAPC_CAPABILITY_IMAP4REV1) == 0) {
+		imapc_connection_input_error(conn,
+			"CAPABILITY list is missing IMAP4REV1");
+		return -1;
+	}
+	return 0;
+}
+
+static int
+imapc_connection_handle_resp_text_code(struct imapc_connection *conn,
+				       const char *key, const char *value)
+{
+	if (strcasecmp(key, "CAPABILITY") == 0) {
+		if (imapc_connection_parse_capability(conn, value) < 0)
+			return -1;
+	}
+	if (strcasecmp(key, "CLOSED") == 0) {
+		/* QRESYNC: SELECTing another mailbox */
+		if (conn->selecting_box != NULL) {
+			conn->selected_box = conn->selecting_box;
+			conn->selecting_box = NULL;
+		}
+	}
+	return 0;
+}
+
+static int
+imapc_connection_handle_resp_text(struct imapc_connection *conn,
+				  const char *text,
+				  const char **key_r, const char **value_r)
+{
+	const char *p, *value;
+
+	i_assert(text[0] == '[');
+
+	p = strchr(text, ']');
+	if (p == NULL) {
+		imapc_connection_input_error(conn, "Missing ']' in resp-text");
+		return -1;
+	}
+	text = t_strdup_until(text + 1, p);
+	value = strchr(text, ' ');
+	if (value != NULL) {
+		*key_r = t_strdup_until(text, value);
+		*value_r = value + 1;
+	} else {
+		*key_r = text;
+		*value_r = "";
+	}
+	return imapc_connection_handle_resp_text_code(conn, *key_r, *value_r);
+}
+
+static int
+imapc_connection_handle_imap_resp_text(struct imapc_connection *conn,
+				       const struct imap_arg *args,
+				       const char **key_r, const char **value_r)
+{
+	const char *text;
+
+	if (args->type != IMAP_ARG_ATOM)
+		return 0;
+
+	text = imap_args_to_str(args);
+	if (*text != '[') {
+		if (*text == '\0') {
+			imapc_connection_input_error(conn,
+				"Missing text in resp-text");
+			return -1;
+		}
+		return 0;
+	}
+	return imapc_connection_handle_resp_text(conn, text, key_r, value_r);
+}
+
+static bool need_literal(const char *str)
+{
+	unsigned int i;
+
+	for (i = 0; str[i] != '\0'; i++) {
+		unsigned char c = str[i];
+
+		if ((c & 0x80) != 0 || c == '\r' || c == '\n')
+			return TRUE;
+	}
+	return FALSE;
+}
+
+static void imapc_connection_input_reset(struct imapc_connection *conn)
+{
+	conn->input_state = IMAPC_INPUT_STATE_NONE;
+	conn->cur_tag = 0;
+	conn->cur_num = 0;
+	if (conn->parser != NULL)
+		imap_parser_reset(conn->parser);
+	imapc_connection_lfiles_free(conn);
+}
+
+static void
+imapc_connection_auth_finish(struct imapc_connection *conn,
+			     const struct imapc_command_reply *reply)
+{
+	if (reply->state != IMAPC_COMMAND_STATE_OK) {
+		imapc_auth_failed(conn, reply, reply->text_full);
+		imapc_connection_disconnect(conn);
+		return;
+	}
+
+	imapc_auth_ok(conn);
+
+	i_assert(array_count(&conn->cmd_wait_list) == 0);
+	timeout_remove(&conn->to);
+	imapc_connection_set_state(conn, IMAPC_CONNECTION_STATE_DONE);
+	imapc_login_callback(conn, reply);
+
+	imapc_command_send_more(conn);
+}
+
+static void imapc_connection_login_cb(const struct imapc_command_reply *reply,
+				      void *context)
+{
+	struct imapc_connection *conn = context;
+
+	imapc_connection_auth_finish(conn, reply);
+}
+
+static void
+imapc_connection_proxyauth_login_cb(const struct imapc_command_reply *reply,
+				    void *context)
+{
+	struct imapc_connection *conn = context;
+	const struct imapc_client_settings *set = &conn->client->set;
+	struct imapc_command *cmd;
+
+	if (reply->state == IMAPC_COMMAND_STATE_OK) {
+		cmd = imapc_connection_cmd(conn, imapc_connection_login_cb,
+					   conn);
+		imapc_command_set_flags(cmd, IMAPC_COMMAND_FLAG_PRELOGIN);
+		imapc_command_sendf(cmd, "PROXYAUTH %s", set->username);
+		imapc_command_send_more(conn);
+	} else {
+		imapc_connection_auth_finish(conn, reply);
+	}
+}
+
+static void
+imapc_connection_authenticate_cb(const struct imapc_command_reply *reply,
+				 void *context)
+{
+	struct imapc_connection *conn = context;
+	const unsigned char *sasl_output;
+	size_t input_len, sasl_output_len;
+	buffer_t *buf;
+	const char *error;
+
+	if ((int)reply->state != IMAPC_COMMAND_STATE_AUTHENTICATE_CONTINUE) {
+		dsasl_client_free(&conn->sasl_client);
+		imapc_connection_auth_finish(conn, reply);
+		return;
+	}
+
+	input_len = strlen(reply->text_full);
+	buf = t_buffer_create(MAX_BASE64_DECODED_SIZE(input_len));
+	if (base64_decode(reply->text_full, input_len, NULL, buf) < 0) {
+		imapc_auth_failed(conn, reply,
+				  t_strdup_printf("Server sent non-base64 input for AUTHENTICATE: %s",
+						  reply->text_full));
+	} else if (dsasl_client_input(conn->sasl_client, buf->data, buf->used, &error) < 0) {
+		imapc_auth_failed(conn, reply, error);
+	} else if (dsasl_client_output(conn->sasl_client, &sasl_output,
+				       &sasl_output_len, &error) < 0) {
+		imapc_auth_failed(conn, reply, error);
+	} else {
+		string_t *imap_output =
+			t_str_new(MAX_BASE64_ENCODED_SIZE(sasl_output_len)+2);
+		base64_encode(sasl_output, sasl_output_len, imap_output);
+		str_append(imap_output, "\r\n");
+		o_stream_nsend(conn->output, str_data(imap_output),
+			       str_len(imap_output));
+		return;
+	}
+	imapc_connection_disconnect(conn);
+}
+
+static bool imapc_connection_have_auth(struct imapc_connection *conn,
+				       const char *mech_name)
+{
+	char *const *capa;
+
+	for (capa = conn->capabilities_list; *capa != NULL; capa++) {
+		if (strncasecmp(*capa, "AUTH=", 5) == 0 &&
+		    strcasecmp((*capa)+5, mech_name) == 0)
+			return TRUE;
+	}
+	return FALSE;
+}
+
+static int
+imapc_connection_get_sasl_mech(struct imapc_connection *conn,
+			       const struct dsasl_client_mech **mech_r,
+			       const char **error_r)
+{
+	const struct imapc_client_settings *set = &conn->client->set;
+	const char *const *mechanisms =
+		t_strsplit_spaces(set->sasl_mechanisms, ", ");
+
+	/* find one of the specified SASL mechanisms */
+	for (; *mechanisms != NULL; mechanisms++) {
+		if (imapc_connection_have_auth(conn, *mechanisms)) {
+			*mech_r = dsasl_client_mech_find(*mechanisms);
+			if (*mech_r != NULL)
+				return 0;
+
+			*error_r = t_strdup_printf(
+				"Support for SASL method '%s' is missing", *mechanisms);
+			return -1;
+		}
+	}
+	*error_r = t_strdup_printf("IMAP server doesn't support any of the requested SASL mechanisms: %s",
+				   set->sasl_mechanisms);
+	return -1;
+}
+
+static void imapc_connection_authenticate(struct imapc_connection *conn)
+{
+	const struct imapc_client_settings *set = &conn->client->set;
+	struct imapc_command *cmd;
+	struct dsasl_client_settings sasl_set;
+	const struct dsasl_client_mech *sasl_mech = NULL;
+	const char *error;
+
+	if (conn->client->set.debug) {
+		if (set->master_user == NULL) {
+			i_debug("imapc(%s): Authenticating as %s",
+				conn->name, set->username);
+		} else {
+			i_debug("imapc(%s): Authenticating as %s for user %s",
+				conn->name, set->master_user, set->username);
+		}
+	}
+
+	if (set->sasl_mechanisms != NULL && set->sasl_mechanisms[0] != '\0') {
+		if (imapc_connection_get_sasl_mech(conn, &sasl_mech, &error) < 0) {
+			struct imapc_command_reply reply;
+			i_zero(&reply);
+			reply.state = IMAPC_COMMAND_STATE_DISCONNECTED;
+			reply.text_full = "";
+			imapc_auth_failed(conn, &reply, error);
+			imapc_connection_disconnect(conn);
+			return;
+		}
+	}
+
+	if (set->use_proxyauth && set->master_user != NULL) {
+		/* We can use LOGIN command */
+		cmd = imapc_connection_cmd(conn, imapc_connection_proxyauth_login_cb,
+					   conn);
+		imapc_command_set_flags(cmd, IMAPC_COMMAND_FLAG_PRELOGIN);
+		imapc_command_sendf(cmd, "LOGIN %s %s",
+				    set->master_user, set->password);
+		return;
+	}
+	if (sasl_mech == NULL &&
+	    ((set->master_user == NULL &&
+	      !need_literal(set->username) && !need_literal(set->password)) ||
+	     (conn->capabilities & IMAPC_CAPABILITY_AUTH_PLAIN) == 0)) {
+		/* We can use LOGIN command */
+		cmd = imapc_connection_cmd(conn, imapc_connection_login_cb,
+					   conn);
+		imapc_command_set_flags(cmd, IMAPC_COMMAND_FLAG_PRELOGIN);
+		imapc_command_sendf(cmd, "LOGIN %s %s",
+				    set->username, set->password);
+		return;
+	}
+
+	i_zero(&sasl_set);
+	if (set->master_user == NULL)
+		sasl_set.authid = set->username;
+	else {
+		sasl_set.authid = set->master_user;
+		sasl_set.authzid = set->username;
+	}
+	sasl_set.password = set->password;
+
+	if (sasl_mech == NULL)
+		sasl_mech = &dsasl_client_mech_plain;
+	conn->sasl_client = dsasl_client_new(sasl_mech, &sasl_set);
+
+	cmd = imapc_connection_cmd(conn, imapc_connection_authenticate_cb, conn);
+	cmd->authenticate = TRUE;
+	imapc_command_set_flags(cmd, IMAPC_COMMAND_FLAG_PRELOGIN);
+
+	if ((conn->capabilities & IMAPC_CAPABILITY_SASL_IR) != 0) {
+		const unsigned char *sasl_output;
+		size_t sasl_output_len;
+		string_t *sasl_output_base64;
+		const char *error;
+
+		if (dsasl_client_output(conn->sasl_client, &sasl_output,
+					&sasl_output_len, &error) < 0) {
+			i_error("imapc(%s): Failed to create initial SASL reply: %s",
+				conn->name, error);
+			imapc_connection_disconnect(conn);
+			return;
+		}
+		sasl_output_base64 = t_str_new(MAX_BASE64_ENCODED_SIZE(sasl_output_len));
+		base64_encode(sasl_output, sasl_output_len, sasl_output_base64);
+
+		imapc_command_sendf(cmd, "AUTHENTICATE %1s %1s",
+				    dsasl_client_mech_get_name(sasl_mech),
+				    str_c(sasl_output_base64));
+	} else {
+		imapc_command_sendf(cmd, "AUTHENTICATE %1s",
+				    dsasl_client_mech_get_name(sasl_mech));
+	}
+}
+
+static void
+imapc_connection_starttls_cb(const struct imapc_command_reply *reply,
+			     void *context)
+{
+	struct imapc_connection *conn = context;
+	struct imapc_command *cmd;
+
+	if (reply->state != IMAPC_COMMAND_STATE_OK) {
+		imapc_connection_input_error(conn, "STARTTLS failed: %s",
+					     reply->text_full);
+		return;
+	}
+
+	if (imapc_connection_ssl_init(conn) < 0)
+		imapc_connection_disconnect(conn);
+	else {
+		/* get updated capabilities */
+		cmd = imapc_connection_cmd(conn, imapc_connection_capability_cb,
+					   conn);
+		imapc_command_set_flags(cmd, IMAPC_COMMAND_FLAG_PRELOGIN);
+		imapc_command_send(cmd, "CAPABILITY");
+	}
+}
+
+static void
+imapc_connection_id_callback(const struct imapc_command_reply *reply ATTR_UNUSED,
+			     void *context ATTR_UNUSED)
+{
+}
+
+static void imapc_connection_send_id(struct imapc_connection *conn)
+{
+	static unsigned int global_id_counter = 0;
+	struct imapc_command *cmd;
+
+	if ((conn->capabilities & IMAPC_CAPABILITY_ID) == 0 ||
+	    conn->client->set.session_id_prefix == NULL)
+		return;
+
+	cmd = imapc_connection_cmd(conn, imapc_connection_id_callback, conn);
+	imapc_command_set_flags(cmd, IMAPC_COMMAND_FLAG_PRELOGIN);
+	imapc_command_send(cmd, t_strdup_printf(
+		"ID (\"name\" \"Dovecot\" \"x-session-ext-id\" \"%s-%u\")",
+		conn->client->set.session_id_prefix, ++global_id_counter));
+}
+
+static void imapc_connection_starttls(struct imapc_connection *conn)
+{
+	struct imapc_command *cmd;
+
+	if (conn->client->set.ssl_mode == IMAPC_CLIENT_SSL_MODE_STARTTLS &&
+	    conn->ssl_iostream == NULL) {
+		if ((conn->capabilities & IMAPC_CAPABILITY_STARTTLS) == 0) {
+			i_error("imapc(%s): Requested STARTTLS, "
+				"but server doesn't support it",
+				conn->name);
+			imapc_connection_disconnect(conn);
+			return;
+		}
+		cmd = imapc_connection_cmd(conn, imapc_connection_starttls_cb,
+					   conn);
+		imapc_command_set_flags(cmd, IMAPC_COMMAND_FLAG_PRELOGIN);
+		imapc_command_send(cmd, "STARTTLS");
+		return;
+	}
+	imapc_connection_send_id(conn);
+	imapc_connection_authenticate(conn);
+}
+
+static void
+imapc_connection_capability_cb(const struct imapc_command_reply *reply,
+			       void *context)
+{
+	struct imapc_connection *conn = context;
+
+	if (reply->state != IMAPC_COMMAND_STATE_OK) {
+		imapc_connection_input_error(conn,
+			"Failed to get capabilities: %s", reply->text_full);
+	} else if (conn->capabilities == 0) {
+		imapc_connection_input_error(conn,
+			"Capabilities not returned by server");
+	} else {
+		imapc_connection_starttls(conn);
+	}
+}
+
+static int imapc_connection_input_banner(struct imapc_connection *conn)
+{
+	const struct imap_arg *imap_args;
+	const char *key, *value;
+	struct imapc_command *cmd;
+	int ret;
+
+	if ((ret = imapc_connection_read_line(conn, &imap_args)) <= 0)
+		return ret;
+	/* we already verified that the banner beigns with OK */
+	i_assert(imap_arg_atom_equals(imap_args, "OK"));
+	imap_args++;
+
+	if (imapc_connection_handle_imap_resp_text(conn, imap_args,
+						   &key, &value) < 0)
+		return -1;
+	imapc_connection_set_state(conn, IMAPC_CONNECTION_STATE_AUTHENTICATING);
+
+	if (conn->capabilities == 0) {
+		/* capabilities weren't sent in the banner. ask for them. */
+		cmd = imapc_connection_cmd(conn, imapc_connection_capability_cb,
+					   conn);
+		imapc_command_set_flags(cmd, IMAPC_COMMAND_FLAG_PRELOGIN);
+		imapc_command_send(cmd, "CAPABILITY");
+	} else {
+		imapc_connection_starttls(conn);
+	}
+	conn->input_callback = NULL;
+	imapc_connection_input_reset(conn);
+	return 1;
+}
+
+static int imapc_connection_input_untagged(struct imapc_connection *conn)
+{
+	const struct imap_arg *imap_args;
+	const unsigned char *data;
+	size_t size;
+	const char *name, *value;
+	struct imap_parser *parser;
+	struct imapc_untagged_reply reply;
+	int ret;
+
+	if (conn->state == IMAPC_CONNECTION_STATE_CONNECTING) {
+		/* input banner */
+		data = i_stream_get_data(conn->input, &size);
+		if (size < 3 && memchr(data, '\n', size) == NULL)
+			return 0;
+		if (i_memcasecmp(data, "OK ", 3) != 0) {
+			imapc_connection_input_error(conn,
+				"Banner doesn't begin with OK: %s",
+				t_strcut(t_strndup(data, size), '\n'));
+			return -1;
+		}
+		conn->input_callback = imapc_connection_input_banner;
+		return 1;
+	}
+
+	if ((ret = imapc_connection_read_line(conn, &imap_args)) == 0)
+		return 0;
+	else if (ret < 0) {
+		imapc_connection_input_reset(conn);
+		return 1;
+	}
+	if (!imap_arg_get_atom(&imap_args[0], &name)) {
+		imapc_connection_input_error(conn, "Invalid untagged reply");
+		return -1;
+	}
+	imap_args++;
+
+	if (conn->input_state == IMAPC_INPUT_STATE_UNTAGGED &&
+	    str_to_uint32(name, &conn->cur_num) == 0) {
+		/* <seq> <event> */
+		conn->input_state = IMAPC_INPUT_STATE_UNTAGGED_NUM;
+		if (!imap_arg_get_atom(&imap_args[0], &name)) {
+			imapc_connection_input_error(conn,
+						     "Invalid untagged reply");
+			return -1;
+		}
+		imap_args++;
+	}
+	i_zero(&reply);
+
+	if (strcasecmp(name, "OK") == 0) {
+		if (imapc_connection_handle_imap_resp_text(conn, imap_args,
+						&reply.resp_text_key,
+						&reply.resp_text_value) < 0)
+			return -1;
+	} else if (strcasecmp(name, "CAPABILITY") == 0) {
+		value = imap_args_to_str(imap_args);
+		if (imapc_connection_parse_capability(conn, value) < 0)
+			return -1;
+	} else if (strcasecmp(name, "BYE") == 0) {
+		i_free(conn->disconnect_reason);
+		conn->disconnect_reason = i_strdup(imap_args_to_str(imap_args));
+	}
+
+	reply.name = name;
+	reply.num = conn->cur_num;
+	reply.args = imap_args;
+	reply.file_args = array_get(&conn->literal_files,
+				    &reply.file_args_count);
+
+	if (conn->selected_box != NULL) {
+		reply.untagged_box_context =
+			conn->selected_box->untagged_box_context;
+	}
+
+	/* the callback may disconnect and destroy the parser */
+	parser = conn->parser;
+	imap_parser_ref(parser);
+	conn->client->untagged_callback(&reply, conn->client->untagged_context);
+	imap_parser_unref(&parser);
+	imapc_connection_input_reset(conn);
+	return 1;
+}
+
+static int imapc_connection_input_plus(struct imapc_connection *conn)
+{
+	struct imapc_command *const *cmds;
+	unsigned int cmds_count;
+	const char *line;
+
+	if ((line = i_stream_next_line(conn->input)) == NULL)
+		return 0;
+
+	cmds = array_get(&conn->cmd_send_queue, &cmds_count);
+	if (conn->idle_plus_waiting) {
+		/* "+ idling" reply for IDLE command */
+		conn->idle_plus_waiting = FALSE;
+		conn->idling = TRUE;
+		/* no timing out while IDLEing */
+		if (conn->to != NULL && !conn->idle_stopping)
+			timeout_remove(&conn->to);
+	} else if (cmds_count > 0 && cmds[0]->wait_for_literal) {
+		/* reply for literal */
+		cmds[0]->wait_for_literal = FALSE;
+		imapc_command_send_more(conn);
+	} else {
+		cmds = array_get(&conn->cmd_wait_list, &cmds_count);
+		if (cmds_count > 0 && cmds[0]->authenticate) {
+			/* continue AUTHENTICATE */
+			struct imapc_command_reply reply;
+
+			i_zero(&reply);
+			reply.state = (enum imapc_command_state)IMAPC_COMMAND_STATE_AUTHENTICATE_CONTINUE;
+			reply.text_full = line;
+			cmds[0]->callback(&reply, cmds[0]->context);
+		} else {
+			imapc_connection_input_error(conn, "Unexpected '+': %s", line);
+			return -1;
+		}
+	}
+
+	imapc_connection_input_reset(conn);
+	return 1;
+}
+
+static void
+imapc_connection_throttle_shrink_timeout(struct imapc_connection *conn)
+{
+	if (conn->throttle_msecs <= 1)
+		conn->throttle_msecs = 0;
+	else
+		conn->throttle_msecs = conn->throttle_msecs*3 / 4;
+
+	if (conn->throttle_shrink_msecs <= conn->client->set.throttle_set.shrink_min_msecs)
+		conn->throttle_shrink_msecs = 0;
+	else
+		conn->throttle_shrink_msecs = conn->throttle_shrink_msecs*3 / 4;
+
+	timeout_remove(&conn->to_throttle_shrink);
+	if (conn->throttle_shrink_msecs > 0) {
+		conn->to_throttle_shrink =
+			timeout_add(conn->throttle_shrink_msecs,
+				    imapc_connection_throttle_shrink_timeout, conn);
+	}
+}
+
+static void
+imapc_connection_throttle(struct imapc_connection *conn,
+			  const struct imapc_command_reply *reply)
+{
+	timeout_remove(&conn->to_throttle);
+
+	/* If GMail returns [THROTTLED], start slowing down commands.
+	   Unfortunately this isn't a nice resp-text-code, but just
+	   appended at the end of the line (although we kind of support
+	   it as resp-text-code also in here if it's uppercased). */
+	if (strstr(reply->text_full, "[THROTTLED]") != NULL) {
+		if (conn->throttle_msecs == 0)
+			conn->throttle_msecs = conn->client->set.throttle_set.init_msecs;
+		else if (conn->throttle_msecs < conn->last_successful_throttle_msecs)
+			conn->throttle_msecs = conn->last_successful_throttle_msecs;
+		else {
+			conn->throttle_msecs *= 2;
+			if (conn->throttle_msecs > conn->client->set.throttle_set.max_msecs)
+				conn->throttle_msecs = conn->client->set.throttle_set.max_msecs;
+		}
+		if (conn->throttle_shrink_msecs == 0)
+			conn->throttle_shrink_msecs = conn->client->set.throttle_set.shrink_min_msecs;
+		else
+			conn->throttle_shrink_msecs *= 2;
+		if (conn->to_throttle_shrink != NULL)
+			timeout_reset(conn->to_throttle_shrink);
+	} else {
+		if (conn->throttle_shrink_msecs > 0 &&
+		    conn->to_throttle_shrink == NULL) {
+			conn->to_throttle_shrink =
+				timeout_add(conn->throttle_shrink_msecs,
+					    imapc_connection_throttle_shrink_timeout, conn);
+		}
+		conn->last_successful_throttle_msecs = conn->throttle_msecs;
+	}
+
+	if (conn->throttle_msecs > 0) {
+		conn->throttle_end_timeval = ioloop_timeval;
+		timeval_add_msecs(&conn->throttle_end_timeval,
+				  conn->throttle_msecs);
+		conn->throttle_pending = TRUE;
+	}
+}
+
+static void
+imapc_command_reply_free(struct imapc_command *cmd,
+			 const struct imapc_command_reply *reply)
+{
+	cmd->callback(reply, cmd->context);
+	imapc_command_free(cmd);
+}
+
+static int imapc_connection_input_tagged(struct imapc_connection *conn)
+{
+	struct imapc_command *const *cmds, *cmd = NULL;
+	unsigned int i, count;
+	char *line, *linep;
+	const char *p;
+	struct imapc_command_reply reply;
+
+	line = i_stream_next_line(conn->input);
+	if (line == NULL)
+		return 0;
+	/* make sure reply texts stays valid if input stream gets freed */
+	line = t_strdup_noconst(line);
+
+	i_zero(&reply);
+
+	linep = strchr(line, ' ');
+	if (linep == NULL)
+		reply.text_full = "";
+	else {
+		*linep = '\0';
+		reply.text_full = linep + 1;
+	}
+
+	if (strcasecmp(line, "ok") == 0)
+		reply.state = IMAPC_COMMAND_STATE_OK;
+	else if (strcasecmp(line, "no") == 0)
+		reply.state = IMAPC_COMMAND_STATE_NO;
+	else if (strcasecmp(line, "bad") == 0)
+		reply.state = IMAPC_COMMAND_STATE_BAD;
+	else {
+		imapc_connection_input_error(conn,
+			"Invalid state in tagged reply: %u %s %s",
+			conn->cur_tag, line, reply.text_full);
+		return -1;
+	}
+
+	if (reply.text_full[0] == '[') {
+		/* get resp-text */
+		if (imapc_connection_handle_resp_text(conn, reply.text_full,
+					&reply.resp_text_key,
+					&reply.resp_text_value) < 0)
+			return -1;
+
+		p = i_strchr_to_next(reply.text_full, ']');
+		i_assert(p != NULL);
+		reply.text_without_resp = p;
+		if (reply.text_without_resp[0] == ' ')
+			reply.text_without_resp++;
+	} else {
+		reply.text_without_resp = reply.text_full;
+	}
+	/* if we've pipelined multiple commands, handle [THROTTLED] reply
+	   from only one of them */
+	if (!conn->throttle_pending)
+		imapc_connection_throttle(conn, &reply);
+
+	/* find the command. it's either the first command in send queue
+	   (literal failed) or somewhere in wait list. */
+	cmds = array_get(&conn->cmd_send_queue, &count);
+	if (count > 0 && cmds[0]->tag == conn->cur_tag) {
+		cmd = cmds[0];
+		array_pop_front(&conn->cmd_send_queue);
+	} else {
+		cmds = array_get(&conn->cmd_wait_list, &count);
+		for (i = 0; i < count; i++) {
+			if (cmds[i]->tag == conn->cur_tag) {
+				cmd = cmds[i];
+				array_delete(&conn->cmd_wait_list, i, 1);
+				break;
+			}
+		}
+	}
+	if (array_count(&conn->cmd_wait_list) == 0 &&
+	    array_count(&conn->cmd_send_queue) == 0 &&
+	    conn->state == IMAPC_CONNECTION_STATE_DONE && conn->to != NULL)
+		timeout_remove(&conn->to);
+
+	if (cmd == NULL) {
+		if (seq_range_exists(&conn->aborted_cmd_tags, conn->cur_tag)) {
+			/* sent command was already aborted - ignore it */
+			seq_range_array_remove(&conn->aborted_cmd_tags,
+					       conn->cur_tag);
+			imapc_connection_input_reset(conn);
+			return 1;
+		}
+		imapc_connection_input_error(conn,
+			"Unknown tag in a reply: %u %s %s",
+			conn->cur_tag, line, reply.text_full);
+		return -1;
+	}
+	if ((cmd->flags & IMAPC_COMMAND_FLAG_SELECT) != 0)
+		conn->select_waiting_reply = FALSE;
+
+	if (reply.state == IMAPC_COMMAND_STATE_BAD) {
+		i_error("imapc(%s): Command '%s' failed with BAD: %u %s",
+			conn->name, imapc_command_get_readable(cmd),
+			conn->cur_tag, reply.text_full);
+		imapc_connection_disconnect(conn);
+	}
+
+	if (reply.state == IMAPC_COMMAND_STATE_NO &&
+	    (cmd->flags & IMAPC_COMMAND_FLAG_SELECT) != 0 &&
+	    conn->selected_box != NULL) {
+		/* EXAMINE/SELECT failed: mailbox is no longer selected */
+		imapc_connection_unselect(conn->selected_box);
+	}
+
+	if (conn->reconnect_command_count > 0 &&
+	    (cmd->flags & IMAPC_COMMAND_FLAG_RECONNECTED) != 0) {
+		i_assert(conn->reconnect_command_count > 0);
+		if (--conn->reconnect_command_count == 0) {
+			/* we've received replies for all the commands started
+			   before reconnection. if we get disconnected now, we
+			   can safely reconnect without worrying about infinite
+			   reconnect loops. */
+			if (conn->selected_box != NULL)
+				conn->selected_box->reconnect_ok = TRUE;
+		}
+	}
+	if (conn->reconnect_command_count == 0) {
+		/* we've successfully received replies to some commands. */
+		conn->reconnect_ok = TRUE;
+	}
+	imapc_connection_input_reset(conn);
+	imapc_command_reply_free(cmd, &reply);
+	imapc_command_send_more(conn);
+	return 1;
+}
+
+static int imapc_connection_input_one(struct imapc_connection *conn)
+{
+	const char *tag;
+	int ret = -1;
+
+	if (conn->input_callback != NULL)
+		return conn->input_callback(conn);
+
+	switch (conn->input_state) {
+	case IMAPC_INPUT_STATE_NONE:
+		tag = imap_parser_read_word(conn->parser);
+		if (tag == NULL)
+			return 0;
+
+		if (strcmp(tag, "*") == 0) {
+			conn->input_state = IMAPC_INPUT_STATE_UNTAGGED;
+			conn->cur_num = 0;
+			ret = imapc_connection_input_untagged(conn);
+		} else if (strcmp(tag, "+") == 0) {
+			conn->input_state = IMAPC_INPUT_STATE_PLUS;
+			ret = imapc_connection_input_plus(conn);
+		} else {
+			conn->input_state = IMAPC_INPUT_STATE_TAGGED;
+			if (str_to_uint(tag, &conn->cur_tag) < 0 ||
+			    conn->cur_tag == 0) {
+				imapc_connection_input_error(conn,
+					"Invalid command tag: %s", tag);
+				ret = -1;
+			} else {
+				ret = imapc_connection_input_tagged(conn);
+			}
+		}
+		break;
+	case IMAPC_INPUT_STATE_PLUS:
+		ret = imapc_connection_input_plus(conn);
+		break;
+	case IMAPC_INPUT_STATE_UNTAGGED:
+	case IMAPC_INPUT_STATE_UNTAGGED_NUM:
+		ret = imapc_connection_input_untagged(conn);
+		break;
+	case IMAPC_INPUT_STATE_TAGGED:
+		ret = imapc_connection_input_tagged(conn);
+		break;
+	}
+	return ret;
+}
+
+static void imapc_connection_input(struct imapc_connection *conn)
+{
+	const char *errstr;
+	string_t *str;
+	ssize_t ret = 0;
+
+	/* we need to read as much as we can with SSL streams to avoid
+	   hanging */
+	imapc_connection_ref(conn);
+	while (conn->input != NULL && (ret = i_stream_read(conn->input)) > 0)
+		imapc_connection_input_pending(conn);
+
+	if (ret < 0 && conn->client->logging_out &&
+	    conn->disconnect_reason != NULL) {
+		/* expected disconnection */
+		imapc_connection_disconnect(conn);
+	} else if (ret < 0) {
+		/* disconnected or buffer full */
+		str = t_str_new(128);
+		if (conn->disconnect_reason != NULL) {
+			str_printfa(str, "Server disconnected with message: %s",
+				    conn->disconnect_reason);
+		} else if (ret == -2) {
+			str_printfa(str, "Server sent too large input "
+				    "(buffer full at %zu)",
+				    i_stream_get_data_size(conn->input));
+		} else if (conn->ssl_iostream == NULL) {
+			errstr = conn->input->stream_errno == 0 ? "EOF" :
+				i_stream_get_error(conn->input);
+			str_printfa(str, "Server disconnected unexpectedly: %s",
+				    errstr);
+		} else {
+			errstr = ssl_iostream_get_last_error(conn->ssl_iostream);
+			if (errstr == NULL) {
+				errstr = conn->input->stream_errno == 0 ? "EOF" :
+					i_stream_get_error(conn->input);
+			}
+			str_printfa(str, "Server disconnected unexpectedly: %s",
+				    errstr);
+		}
+		imapc_connection_try_reconnect(conn, str_c(str), 0, FALSE);
+	}
+	imapc_connection_unref(&conn);
+}
+
+static int imapc_connection_ssl_handshaked(const char **error_r, void *context)
+{
+	struct imapc_connection *conn = context;
+	const char *error;
+
+	if (ssl_iostream_check_cert_validity(conn->ssl_iostream,
+					     conn->client->set.host, &error) == 0) {
+		if (conn->client->set.debug) {
+			i_debug("imapc(%s): SSL handshake successful",
+				conn->name);
+		}
+		return 0;
+	} else if (conn->client->set.ssl_set.allow_invalid_cert) {
+		if (conn->client->set.debug) {
+			i_debug("imapc(%s): SSL handshake successful, "
+				"ignoring invalid certificate: %s",
+				conn->name, error);
+		}
+		return 0;
+	} else {
+		*error_r = error;
+		return -1;
+	}
+}
+
+static int imapc_connection_ssl_init(struct imapc_connection *conn)
+{
+	const char *error;
+
+	if (conn->client->ssl_ctx == NULL) {
+		i_error("imapc(%s): No SSL context", conn->name);
+		return -1;
+	}
+
+	if (conn->client->set.debug)
+		i_debug("imapc(%s): Starting SSL handshake", conn->name);
+
+	if (conn->raw_input != conn->input) {
+		/* recreate rawlog after STARTTLS */
+		i_stream_ref(conn->raw_input);
+		o_stream_ref(conn->raw_output);
+		i_stream_destroy(&conn->input);
+		o_stream_destroy(&conn->output);
+		conn->input = conn->raw_input;
+		conn->output = conn->raw_output;
+	}
+
+	io_remove(&conn->io);
+	if (io_stream_create_ssl_client(conn->client->ssl_ctx,
+					conn->client->set.host,
+					&conn->client->set.ssl_set,
+					&conn->input, &conn->output,
+					&conn->ssl_iostream, &error) < 0) {
+		i_error("imapc(%s): Couldn't initialize SSL client: %s",
+			conn->name, error);
+		return -1;
+	}
+	conn->io = io_add_istream(conn->input, imapc_connection_input, conn);
+	ssl_iostream_set_handshake_callback(conn->ssl_iostream,
+					    imapc_connection_ssl_handshaked,
+					    conn);
+	if (ssl_iostream_handshake(conn->ssl_iostream) < 0) {
+		i_error("imapc(%s): SSL handshake failed: %s", conn->name,
+			ssl_iostream_get_last_error(conn->ssl_iostream));
+		return -1;
+	}
+
+	if (*conn->client->set.rawlog_dir != '\0') {
+		iostream_rawlog_create(conn->client->set.rawlog_dir,
+				       &conn->input, &conn->output);
+	}
+
+	imap_parser_set_streams(conn->parser, conn->input, NULL);
+	return 0;
+}
+
+static int imapc_connection_connected(struct imapc_connection *conn)
+{
+	const struct ip_addr *ip = &conn->ips[conn->prev_connect_idx];
+	struct ip_addr local_ip;
+	in_port_t local_port;
+	int err;
+
+	i_assert(conn->io == NULL);
+
+	err = net_geterror(conn->fd);
+	if (err != 0) {
+		imapc_connection_try_reconnect(conn, t_strdup_printf(
+			"connect(%s, %u) failed: %s",
+			net_ip2addr(ip), conn->client->set.port,
+			strerror(err)), conn->client->set.connect_retry_interval_msecs, TRUE);
+		return -1;
+	}
+	if (net_getsockname(conn->fd, &local_ip, &local_port) < 0)
+		local_port = 0;
+	i_info("imapc(%s): Connected to %s:%u (local %s:%u)", conn->name,
+	       net_ip2addr(ip), conn->client->set.port,
+	       net_ip2addr(&local_ip), local_port);
+	conn->io = io_add(conn->fd, IO_READ, imapc_connection_input, conn);
+	o_stream_set_flush_callback(conn->output, imapc_connection_output,
+				    conn);
+
+	if (conn->client->set.ssl_mode == IMAPC_CLIENT_SSL_MODE_IMMEDIATE) {
+		if (imapc_connection_ssl_init(conn) < 0)
+			imapc_connection_disconnect(conn);
+	}
+	return imapc_connection_output(conn);
+}
+
+static void imapc_connection_timeout(struct imapc_connection *conn)
+{
+	const struct ip_addr *ip = &conn->ips[conn->prev_connect_idx];
+	const char *errstr;
+	bool connect_error = FALSE;
+
+	switch (conn->state) {
+	case IMAPC_CONNECTION_STATE_CONNECTING:
+		errstr = t_strdup_printf("connect(%s, %u) timed out after %u seconds",
+			net_ip2addr(ip), conn->client->set.port,
+			conn->client->set.connect_timeout_msecs/1000);
+		connect_error = TRUE;
+		break;
+	case IMAPC_CONNECTION_STATE_AUTHENTICATING:
+		errstr = t_strdup_printf("Authentication timed out after %u seconds",
+			conn->client->set.connect_timeout_msecs/1000);
+		break;
+	default:
+		i_unreached();
+	}
+	imapc_connection_try_reconnect(conn, errstr, 0, connect_error);
+}
+
+static void
+imapc_noop_callback(const struct imapc_command_reply *reply ATTR_UNUSED,
+		    void *context ATTR_UNUSED)
+{
+}
+
+static void
+imapc_reidle_callback(const struct imapc_command_reply *reply ATTR_UNUSED,
+		      void *context)
+{
+	struct imapc_connection *conn = context;
+
+	imapc_connection_idle(conn);
+}
+
+static void imapc_connection_reset_idle(struct imapc_connection *conn)
+{
+	struct imapc_command *cmd;
+
+	if (conn->idling)
+		cmd = imapc_connection_cmd(conn, imapc_reidle_callback, conn);
+	else if (array_count(&conn->cmd_wait_list) == 0)
+		cmd = imapc_connection_cmd(conn, imapc_noop_callback, NULL);
+	else {
+		/* IMAP command reply is taking a long time */
+		return;
+	}
+	imapc_command_send(cmd, "NOOP");
+}
+
+static void imapc_connection_connect_next_ip(struct imapc_connection *conn)
+{
+	const struct ip_addr *ip = NULL;
+	unsigned int i;
+	int fd;
+
+	i_assert(conn->client->set.max_idle_time > 0);
+
+	for (i = 0; i<conn->ips_count;) {
+		conn->prev_connect_idx = (conn->prev_connect_idx+1) % conn->ips_count;
+		ip = &conn->ips[conn->prev_connect_idx];
+		fd = net_connect_ip(ip, conn->client->set.port, NULL);
+		if (fd != -1)
+			break;
+
+		/* failed to connect to one of the IPs immediately
+		   (e.g. IPv6 address without connectivity). try all IPs
+		   before failing completely. */
+		i_error("net_connect_ip(%s:%u) failed: %m",
+			net_ip2addr(ip), conn->client->set.port);
+		if (conn->prev_connect_idx+1 == conn->ips_count) {
+			imapc_connection_try_reconnect(conn, "No more IP address(es) to try",
+				conn->client->set.connect_retry_interval_msecs, TRUE);
+			return;
+		}
+	}
+
+	i_assert(ip != NULL);
+
+	conn->fd = fd;
+	conn->input = conn->raw_input =
+		i_stream_create_fd(fd, conn->client->set.max_line_length);
+	conn->output = conn->raw_output = o_stream_create_fd(fd, SIZE_MAX);
+	o_stream_set_no_error_handling(conn->output, TRUE);
+
+	if (*conn->client->set.rawlog_dir != '\0' &&
+	    conn->client->set.ssl_mode != IMAPC_CLIENT_SSL_MODE_IMMEDIATE) {
+		iostream_rawlog_create(conn->client->set.rawlog_dir,
+				       &conn->input, &conn->output);
+	}
+
+	o_stream_set_flush_pending(conn->output, TRUE);
+	o_stream_set_flush_callback(conn->output, imapc_connection_connected,
+				    conn);
+	conn->parser = imap_parser_create(conn->input, NULL,
+					  conn->client->set.max_line_length);
+	conn->to = timeout_add(conn->client->set.connect_timeout_msecs,
+			       imapc_connection_timeout, conn);
+	conn->to_output = timeout_add(conn->client->set.max_idle_time*1000,
+				      imapc_connection_reset_idle, conn);
+	if (conn->client->set.debug) {
+		i_debug("imapc(%s): Connecting to %s:%u", conn->name,
+			net_ip2addr(ip), conn->client->set.port);
+	}
+}
+
+static void
+imapc_connection_dns_callback(const struct dns_lookup_result *result,
+			      struct imapc_connection *conn)
+{
+	conn->dns_lookup = NULL;
+
+	if (result->ret != 0) {
+		i_error("imapc(%s): dns_lookup(%s) failed: %s",
+			conn->name, conn->client->set.host, result->error);
+		imapc_connection_set_disconnected(conn);
+		return;
+	}
+
+	i_assert(result->ips_count > 0);
+	conn->ips_count = result->ips_count;
+	conn->ips = i_new(struct ip_addr, conn->ips_count);
+	memcpy(conn->ips, result->ips, sizeof(*conn->ips) * conn->ips_count);
+	conn->prev_connect_idx = conn->ips_count - 1;
+
+	imapc_connection_connect_next_ip(conn);
+}
+
+void imapc_connection_connect(struct imapc_connection *conn)
+{
+	struct dns_lookup_settings dns_set;
+	struct ip_addr ip, *ips;
+	unsigned int ips_count;
+	int ret;
+
+	if (conn->fd != -1 || conn->dns_lookup != NULL)
+		return;
+	if (conn->reconnect_waiting) {
+		/* wait for the reconnection delay to finish before
+		   doing anything. */
+		return;
+	}
+
+	conn->reconnecting = FALSE;
+	/* if we get disconnected before we've finished all the pending
+	   commands, don't reconnect */
+	conn->reconnect_command_count = array_count(&conn->cmd_wait_list) +
+		array_count(&conn->cmd_send_queue);
+
+	imapc_connection_input_reset(conn);
+	conn->last_connect = ioloop_timeval;
+
+	if (conn->client->set.debug) {
+		i_debug("imapc(%s): Looking up IP address "
+			"(reconnect_ok=%s, last_connect=%ld)", conn->name,
+			(conn->reconnect_ok ? "true" : "false"),
+			(long)conn->last_connect.tv_sec);
+	}
+
+	i_zero(&dns_set);
+	dns_set.dns_client_socket_path =
+		conn->client->set.dns_client_socket_path;
+	dns_set.timeout_msecs = conn->client->set.connect_timeout_msecs;
+	dns_set.event_parent = conn->client->event;
+
+	imapc_connection_set_state(conn, IMAPC_CONNECTION_STATE_CONNECTING);
+	if (conn->ips_count > 0) {
+		/* do nothing */
+	} else if (net_addr2ip(conn->client->set.host, &ip) == 0) {
+		conn->ips_count = 1;
+		conn->ips = i_new(struct ip_addr, conn->ips_count);
+		conn->ips[0] = ip;
+	} else if (*dns_set.dns_client_socket_path == '\0') {
+		ret = net_gethostbyname(conn->client->set.host,
+					&ips, &ips_count);
+		if (ret != 0) {
+			i_error("imapc(%s): net_gethostbyname(%s) failed: %s",
+				conn->name, conn->client->set.host,
+				net_gethosterror(ret));
+			imapc_connection_set_disconnected(conn);
+			return;
+		}
+		conn->ips_count = ips_count;
+		conn->ips = i_new(struct ip_addr, ips_count);
+		memcpy(conn->ips, ips, ips_count * sizeof(*ips));
+	} else {
+		(void)dns_lookup(conn->client->set.host, &dns_set,
+				 imapc_connection_dns_callback, conn,
+				 &conn->dns_lookup);
+		return;
+	}
+	imapc_connection_connect_next_ip(conn);
+}
+
+void imapc_connection_input_pending(struct imapc_connection *conn)
+{
+	int ret = 1;
+
+	if (conn->input == NULL)
+		return;
+
+	if (conn->to != NULL && !conn->idle_stopping)
+		timeout_reset(conn->to);
+
+	o_stream_cork(conn->output);
+	while (ret > 0 && conn->input != NULL) {
+		T_BEGIN {
+			ret = imapc_connection_input_one(conn);
+		} T_END;
+	}
+
+	if (conn->output != NULL)
+		o_stream_uncork(conn->output);
+}
+
+static struct imapc_command *
+imapc_command_begin(imapc_command_callback_t *callback, void *context)
+{
+	struct imapc_command *cmd;
+	pool_t pool;
+
+	i_assert(callback != NULL);
+
+	pool = pool_alloconly_create("imapc command", 2048);
+	cmd = p_new(pool, struct imapc_command, 1);
+	cmd->pool = pool;
+	cmd->callback = callback;
+	cmd->context = context;
+
+	/* use a globally unique tag counter so looking at rawlogs is
+	   somewhat easier */
+	if (++imapc_client_cmd_tag_counter == 0)
+		imapc_client_cmd_tag_counter++;
+	cmd->tag = imapc_client_cmd_tag_counter;
+	return cmd;
+}
+
+static void imapc_command_free(struct imapc_command *cmd)
+{
+	struct imapc_command_stream *stream;
+
+	if (array_is_created(&cmd->streams)) {
+		array_foreach_modifiable(&cmd->streams, stream)
+			i_stream_unref(&stream->input);
+	}
+	pool_unref(&cmd->pool);
+}
+
+const char *imapc_command_get_tag(struct imapc_command *cmd)
+{
+	return t_strdup_printf("%u", cmd->tag);
+}
+
+void imapc_command_abort(struct imapc_command **_cmd)
+{
+	struct imapc_command *cmd = *_cmd;
+
+	*_cmd = NULL;
+	imapc_command_free(cmd);
+}
+
+static void imapc_command_timeout(struct imapc_connection *conn)
+{
+	struct imapc_command *const *cmds;
+	unsigned int count;
+
+	cmds = array_get(&conn->cmd_wait_list, &count);
+	i_assert(count > 0);
+
+	imapc_connection_try_reconnect(conn, t_strdup_printf(
+		"Command '%s' timed out", imapc_command_get_readable(cmds[0])), 0, FALSE);
+}
+
+static bool
+parse_sync_literal(const unsigned char *data, unsigned int pos,
+		   unsigned int *value_r)
+{
+	unsigned int value = 0, mul = 1;
+
+	/* data should contain "{size}\r\n" and pos points after \n */
+	if (pos <= 4 || data[pos-1] != '\n' || data[pos-2] != '\r' ||
+	    data[pos-3] != '}' || !i_isdigit(data[pos-4]))
+		return FALSE;
+	pos -= 4;
+
+	do {
+		value += (data[pos] - '0') * mul;
+		mul = mul*10;
+		pos--;
+	} while (pos > 0 && i_isdigit(data[pos]));
+
+	if (pos == 0 || data[pos] != '{')
+		return FALSE;
+
+	*value_r = value;
+	return TRUE;
+}
+
+static void imapc_command_send_finished(struct imapc_connection *conn,
+					struct imapc_command *cmd)
+{
+	struct imapc_command *const *cmdp;
+
+	i_assert(conn->to != NULL);
+
+	if (cmd->idle)
+		conn->idle_plus_waiting = TRUE;
+	cmd->sent = TRUE;
+
+	/* everything sent. move command to wait list. */
+	cmdp = array_front(&conn->cmd_send_queue);
+	i_assert(*cmdp == cmd);
+	array_pop_front(&conn->cmd_send_queue);
+	array_push_back(&conn->cmd_wait_list, &cmd);
+
+	/* send the next command in queue */
+	imapc_command_send_more(conn);
+}
+
+static struct imapc_command_stream *
+imapc_command_get_sending_stream(struct imapc_command *cmd)
+{
+	struct imapc_command_stream *stream;
+
+	if (!array_is_created(&cmd->streams) || array_count(&cmd->streams) == 0)
+		return NULL;
+
+	stream = array_front_modifiable(&cmd->streams);
+	if (stream->pos != cmd->send_pos)
+		return NULL;
+	return stream;
+}
+
+static int imapc_command_try_send_stream(struct imapc_connection *conn,
+					 struct imapc_command *cmd)
+{
+	struct imapc_command_stream *stream;
+	enum ostream_send_istream_result res;
+
+	stream = imapc_command_get_sending_stream(cmd);
+	if (stream == NULL)
+		return -2;
+
+	/* we're sending the stream now */
+	o_stream_set_max_buffer_size(conn->output, 0);
+	res = o_stream_send_istream(conn->output, stream->input);
+	o_stream_set_max_buffer_size(conn->output, SIZE_MAX);
+
+	switch (res) {
+	case OSTREAM_SEND_ISTREAM_RESULT_FINISHED:
+		break;
+	case OSTREAM_SEND_ISTREAM_RESULT_WAIT_INPUT:
+		i_unreached();
+	case OSTREAM_SEND_ISTREAM_RESULT_WAIT_OUTPUT:
+		i_assert(stream->input->v_offset < stream->size);
+		return 0;
+	case OSTREAM_SEND_ISTREAM_RESULT_ERROR_INPUT:
+		i_error("imapc: read(%s) failed: %s",
+			i_stream_get_name(stream->input),
+			i_stream_get_error(stream->input));
+		return -1;
+	case OSTREAM_SEND_ISTREAM_RESULT_ERROR_OUTPUT:
+		/* disconnected */
+		return -1;
+	}
+	i_assert(stream->input->v_offset == stream->size);
+
+	/* finished with the stream */
+	i_stream_unref(&stream->input);
+	array_pop_front(&cmd->streams);
+
+	i_assert(cmd->send_pos != cmd->data->used);
+	return 1;
+}
+
+static void imapc_connection_set_selecting(struct imapc_client_mailbox *box)
+{
+	struct imapc_connection *conn = box->conn;
+
+	i_assert(conn->selecting_box == NULL);
+
+	if (conn->selected_box != NULL &&
+	    (conn->capabilities & IMAPC_CAPABILITY_QRESYNC) != 0) {
+		/* server will send a [CLOSED] once selected mailbox is
+		   closed */
+		conn->selecting_box = box;
+	} else {
+		/* we'll have to assume that all the future untagged messages
+		   are for the mailbox we're selecting */
+		conn->selected_box = box;
+	}
+	conn->select_waiting_reply = TRUE;
+}
+
+static bool imapc_connection_is_throttled(struct imapc_connection *conn)
+{
+	timeout_remove(&conn->to_throttle);
+
+	if (conn->throttle_msecs == 0) {
+		/* we haven't received [THROTTLED] recently */
+		return FALSE;
+	}
+	if (array_count(&conn->cmd_wait_list) > 0) {
+		/* wait until we have received the existing commands' tagged
+		   replies to see if we're still throttled */
+		return TRUE;
+	}
+	if (timeval_cmp(&ioloop_timeval, &conn->throttle_end_timeval) >= 0) {
+		/* we reached the throttle timeout - send the next command */
+		conn->throttle_pending = FALSE;
+		return FALSE;
+	}
+
+	/* we're still being throttled - wait for it to end */
+	conn->to_throttle = timeout_add_absolute(&conn->throttle_end_timeval,
+						 imapc_command_send_more, conn);
+	return TRUE;
+}
+
+static void imapc_command_send_more(struct imapc_connection *conn)
+{
+	struct imapc_command *const *cmds, *cmd;
+	struct imapc_command_reply reply;
+	const unsigned char *p, *data;
+	unsigned int count, size;
+	size_t seek_pos, start_pos, end_pos;
+	int ret;
+
+	if (imapc_connection_is_throttled(conn))
+		return;
+
+	cmds = array_get(&conn->cmd_send_queue, &count);
+	if (count == 0)
+		return;
+	cmd = cmds[0];
+
+	if ((cmd->flags & IMAPC_COMMAND_FLAG_PRELOGIN) == 0 &&
+	    conn->state != IMAPC_CONNECTION_STATE_DONE) {
+		/* wait until we're fully connected */
+		return;
+	}
+	if ((cmd->flags & IMAPC_COMMAND_FLAG_LOGOUT) != 0 &&
+	    array_count(&conn->cmd_wait_list) > 0) {
+		/* wait until existing commands have finished */
+		return;
+	}
+	if (conn->select_waiting_reply) {
+		/* wait for SELECT to finish */
+		return;
+	}
+	if (cmd->wait_for_literal) {
+		/* wait until we received '+' */
+		return;
+	}
+
+	i_assert(cmd->send_pos < cmd->data->used);
+
+	if (cmd->box == NULL) {
+		/* non-mailbox command */
+	} else if (cmd->send_pos == 0 &&
+		   (cmd->flags & IMAPC_COMMAND_FLAG_SELECT) != 0) {
+		/* SELECT/EXAMINE command */
+		imapc_connection_set_selecting(cmd->box);
+	} else if (!imapc_client_mailbox_is_opened(cmd->box)) {
+		if (cmd->box->reconnecting) {
+			/* wait for SELECT/EXAMINE */
+			return;
+		}
+		/* shouldn't normally happen */
+		i_zero(&reply);
+		reply.text_without_resp = reply.text_full = "Mailbox not open";
+		reply.state = IMAPC_COMMAND_STATE_DISCONNECTED;
+
+		array_pop_front(&conn->cmd_send_queue);
+		imapc_command_reply_free(cmd, &reply);
+		imapc_command_send_more(conn);
+		return;
+	}
+
+	/* add timeout for commands if there's not one yet
+	   (pre-login has its own timeout) */
+	if ((cmd->flags & IMAPC_COMMAND_FLAG_LOGOUT) != 0) {
+		/* LOGOUT has a shorter timeout */
+		timeout_remove(&conn->to);
+		conn->to = timeout_add(IMAPC_LOGOUT_TIMEOUT_MSECS,
+				       imapc_command_timeout, conn);
+	} else if (conn->to == NULL) {
+		conn->to = timeout_add(conn->client->set.cmd_timeout_msecs,
+				       imapc_command_timeout, conn);
+	}
+
+	timeout_reset(conn->to_output);
+	if ((ret = imapc_command_try_send_stream(conn, cmd)) == 0)
+		return;
+	if (ret == -1) {
+		i_zero(&reply);
+		reply.text_without_resp = reply.text_full = "Mailbox not open";
+		reply.state = IMAPC_COMMAND_STATE_DISCONNECTED;
+
+		array_pop_front(&conn->cmd_send_queue);
+		imapc_command_reply_free(cmd, &reply);
+		imapc_command_send_more(conn);
+		return;
+	}
+
+	seek_pos = cmd->send_pos;
+	if (seek_pos != 0 && ret == -2) {
+		/* skip over the literal. we can also get here from
+		   AUTHENTICATE command, which doesn't use a literal */
+		if (parse_sync_literal(cmd->data->data, seek_pos, &size)) {
+			seek_pos += size;
+			i_assert(seek_pos <= cmd->data->used);
+		}
+	}
+
+	do {
+		start_pos = seek_pos;
+		p = memchr(CONST_PTR_OFFSET(cmd->data->data, seek_pos), '\n',
+			   cmd->data->used - seek_pos);
+		i_assert(p != NULL);
+
+		seek_pos = p - (const unsigned char *)cmd->data->data + 1;
+		/* keep going for LITERAL+ command */
+	} while (start_pos + 3 < seek_pos &&
+		 p[-1] == '\r' && p[-2] == '}' && p[-3] == '+');
+	end_pos = seek_pos;
+
+	data = CONST_PTR_OFFSET(cmd->data->data, cmd->send_pos);
+	size = end_pos - cmd->send_pos;
+	o_stream_nsend(conn->output, data, size);
+	cmd->send_pos = end_pos;
+
+	if (cmd->send_pos == cmd->data->used) {
+		i_assert(!array_is_created(&cmd->streams) ||
+			 array_count(&cmd->streams) == 0);
+		imapc_command_send_finished(conn, cmd);
+	} else {
+		cmd->wait_for_literal = TRUE;
+	}
+}
+
+static void imapc_connection_send_idle_done(struct imapc_connection *conn)
+{
+	if ((conn->idling || conn->idle_plus_waiting) && !conn->idle_stopping) {
+		conn->idle_stopping = TRUE;
+		o_stream_nsend_str(conn->output, "DONE\r\n");
+		if (conn->to == NULL) {
+			conn->to = timeout_add(conn->client->set.cmd_timeout_msecs,
+					       imapc_command_timeout, conn);
+		}
+	}
+}
+
+static void imapc_connection_cmd_send(struct imapc_command *cmd)
+{
+	struct imapc_connection *conn = cmd->conn;
+	struct imapc_command *const *cmds;
+	unsigned int i, count;
+
+	imapc_connection_send_idle_done(conn);
+
+	i_assert((cmd->flags & IMAPC_COMMAND_FLAG_RECONNECTED) == 0);
+
+	if ((cmd->flags & IMAPC_COMMAND_FLAG_PRELOGIN) != 0 &&
+	    conn->state == IMAPC_CONNECTION_STATE_AUTHENTICATING) {
+		/* pre-login commands get inserted before everything else */
+		array_push_front(&conn->cmd_send_queue, &cmd);
+		imapc_command_send_more(conn);
+		return;
+	}
+
+	/* add the command just before retried commands */
+	cmds = array_get(&conn->cmd_send_queue, &count);
+	for (i = count; i > 0; i--) {
+		if ((cmds[i-1]->flags & IMAPC_COMMAND_FLAG_RECONNECTED) == 0)
+			break;
+	}
+	array_insert(&conn->cmd_send_queue, i, &cmd, 1);
+	imapc_command_send_more(conn);
+}
+
+static int imapc_connection_output(struct imapc_connection *conn)
+{
+	struct imapc_command *const *cmds;
+	unsigned int count;
+	int ret;
+
+	if (conn->to != NULL)
+		timeout_reset(conn->to);
+
+	if ((ret = o_stream_flush(conn->output)) < 0)
+		return 1;
+
+	imapc_connection_ref(conn);
+	cmds = array_get(&conn->cmd_send_queue, &count);
+	if (count > 0) {
+		if (imapc_command_get_sending_stream(cmds[0]) != NULL &&
+		    !cmds[0]->wait_for_literal) {
+			/* we're sending a stream. send more. */
+			imapc_command_send_more(conn);
+		}
+	}
+	imapc_connection_unref(&conn);
+	return ret;
+}
+
+struct imapc_command *
+imapc_connection_cmd(struct imapc_connection *conn,
+		     imapc_command_callback_t *callback, void *context)
+{
+	struct imapc_command *cmd;
+
+	cmd = imapc_command_begin(callback, context);
+	cmd->conn = conn;
+	return cmd;
+}
+
+void imapc_command_set_flags(struct imapc_command *cmd,
+			     enum imapc_command_flags flags)
+{
+	cmd->flags = flags;
+}
+
+void imapc_command_set_mailbox(struct imapc_command *cmd,
+			       struct imapc_client_mailbox *box)
+{
+	cmd->box = box;
+}
+
+bool imapc_command_connection_is_selected(struct imapc_command *cmd)
+{
+	return cmd->conn->selected_box != NULL ||
+		cmd->conn->selecting_box != NULL;
+}
+
+void imapc_command_send(struct imapc_command *cmd, const char *cmd_str)
+{
+	size_t len = strlen(cmd_str);
+
+	cmd->data = str_new(cmd->pool, 6 + len + 2);
+	str_printfa(cmd->data, "%u %s\r\n", cmd->tag, cmd_str);
+	imapc_connection_cmd_send(cmd);
+}
+
+void imapc_command_sendf(struct imapc_command *cmd, const char *cmd_fmt, ...)
+{
+	va_list args;
+
+	va_start(args, cmd_fmt);
+	imapc_command_sendvf(cmd, cmd_fmt, args);
+	va_end(args);
+}
+
+void imapc_command_sendvf(struct imapc_command *cmd,
+			  const char *cmd_fmt, va_list args)
+{
+	unsigned int i;
+
+	cmd->data = str_new(cmd->pool, 128);
+	str_printfa(cmd->data, "%u ", cmd->tag);
+
+	for (i = 0; cmd_fmt[i] != '\0'; i++) {
+		if (cmd_fmt[i] != '%') {
+			str_append_c(cmd->data, cmd_fmt[i]);
+			continue;
+		}
+
+		switch (cmd_fmt[++i]) {
+		case '\0':
+			i_unreached();
+		case 'u': {
+			unsigned int arg = va_arg(args, unsigned int);
+
+			str_printfa(cmd->data, "%u", arg);
+			break;
+		}
+		case 'p': {
+			struct istream *input = va_arg(args, struct istream *);
+			struct imapc_command_stream *s;
+			uoff_t size;
+
+			if (!array_is_created(&cmd->streams))
+				p_array_init(&cmd->streams, cmd->pool, 2);
+			if (i_stream_get_size(input, TRUE, &size) < 0)
+				size = 0;
+			str_printfa(cmd->data, "{%"PRIuUOFF_T"}\r\n", size);
+			s = array_append_space(&cmd->streams);
+			s->pos = str_len(cmd->data);
+			s->size = size;
+			s->input = input;
+			i_stream_ref(input);
+			break;
+		}
+		case 's': {
+			const char *arg = va_arg(args, const char *);
+
+			if (!need_literal(arg))
+				imap_append_quoted(cmd->data, arg);
+			else if ((cmd->conn->capabilities &
+				  IMAPC_CAPABILITY_LITERALPLUS) != 0) {
+				str_printfa(cmd->data, "{%zu+}\r\n%s",
+					    strlen(arg), arg);
+			} else {
+				str_printfa(cmd->data, "{%zu}\r\n%s",
+					    strlen(arg), arg);
+			}
+			break;
+		}
+		case '1': {
+			/* %1s - no quoting */
+			const char *arg = va_arg(args, const char *);
+
+			i++;
+			i_assert(cmd_fmt[i] == 's');
+			str_append(cmd->data, arg);
+			break;
+		}
+		}
+	}
+	str_append(cmd->data, "\r\n");
+
+	imapc_connection_cmd_send(cmd);
+}
+
+enum imapc_connection_state
+imapc_connection_get_state(struct imapc_connection *conn)
+{
+	return conn->state;
+}
+
+enum imapc_capability
+imapc_connection_get_capabilities(struct imapc_connection *conn)
+{
+	return conn->capabilities;
+}
+
+void imapc_connection_unselect(struct imapc_client_mailbox *box)
+{
+	struct imapc_connection *conn = box->conn;
+
+	if (conn->selected_box != NULL || conn->selecting_box != NULL) {
+		i_assert(conn->selected_box == box ||
+			 conn->selecting_box == box);
+
+		conn->selected_box = NULL;
+		conn->selecting_box = NULL;
+	}
+	imapc_connection_send_idle_done(conn);
+	imapc_connection_abort_commands(conn, box, FALSE);
+}
+
+struct imapc_client_mailbox *
+imapc_connection_get_mailbox(struct imapc_connection *conn)
+{
+	if (conn->selecting_box != NULL)
+		return conn->selecting_box;
+	return conn->selected_box;
+}
+
+static void
+imapc_connection_idle_callback(const struct imapc_command_reply *reply ATTR_UNUSED,
+			       void *context)
+{
+	struct imapc_connection *conn = context;
+
+	conn->idling = FALSE;
+	conn->idle_plus_waiting = FALSE;
+	conn->idle_stopping = FALSE;
+}
+
+void imapc_connection_idle(struct imapc_connection *conn)
+{
+	struct imapc_command *cmd;
+
+	if (array_count(&conn->cmd_send_queue) != 0 ||
+	    array_count(&conn->cmd_wait_list) != 0 ||
+	    conn->idling || conn->idle_plus_waiting ||
+	    (conn->capabilities & IMAPC_CAPABILITY_IDLE) == 0)
+		return;
+
+	cmd = imapc_connection_cmd(conn, imapc_connection_idle_callback, conn);
+	cmd->idle = TRUE;
+	imapc_command_send(cmd, "IDLE");
+}
diff --git a/src/lib-imap-client/imapc-connection.h b/src/lib-imap-client/imapc-connection.h
new file mode 100644
index 0000000..8fda692
--- /dev/null
+++ b/src/lib-imap-client/imapc-connection.h
@@ -0,0 +1,63 @@
+#ifndef IMAPC_CONNECTION_H
+#define IMAPC_CONNECTION_H
+
+#include "imapc-client.h"
+
+/* [THROTTLED] handling behavior */
+#define IMAPC_THROTTLE_DEFAULT_INIT_MSECS 50
+#define IMAPC_THROTTLE_DEFAULT_MAX_MSECS (16*1000)
+#define IMAPC_THROTTLE_DEFAULT_SHRINK_MIN_MSECS 500
+
+struct imapc_client;
+struct imapc_connection;
+
+enum imapc_connection_state {
+	/* No connection */
+	IMAPC_CONNECTION_STATE_DISCONNECTED = 0,
+	/* Trying to connect */
+	IMAPC_CONNECTION_STATE_CONNECTING,
+	/* Connected, trying to authenticate */
+	IMAPC_CONNECTION_STATE_AUTHENTICATING,
+	/* Authenticated, ready to accept commands */
+	IMAPC_CONNECTION_STATE_DONE
+};
+
+struct imapc_connection *
+imapc_connection_init(struct imapc_client *client,
+		      imapc_command_callback_t *login_callback,
+		      void *login_context);
+void imapc_connection_deinit(struct imapc_connection **conn);
+
+void imapc_connection_connect(struct imapc_connection *conn);
+void imapc_connection_set_no_reconnect(struct imapc_connection *conn);
+void imapc_connection_disconnect(struct imapc_connection *conn);
+void imapc_connection_disconnect_full(struct imapc_connection *conn,
+				      bool reconnecting);
+void imapc_connection_try_reconnect(struct imapc_connection *conn,
+				    const char *errstr,
+				    unsigned int delay_msecs,
+				    bool connect_error);
+void imapc_connection_abort_commands(struct imapc_connection *conn,
+				     struct imapc_client_mailbox *only_box,
+				     bool keep_retriable) ATTR_NULL(2);
+void imapc_connection_ioloop_changed(struct imapc_connection *conn);
+void imapc_connection_input_pending(struct imapc_connection *conn);
+
+struct imapc_command *
+imapc_connection_cmd(struct imapc_connection *conn,
+		     imapc_command_callback_t *callback, void *context)
+	ATTR_NULL(3);
+
+void imapc_connection_unselect(struct imapc_client_mailbox *box);
+
+enum imapc_connection_state
+imapc_connection_get_state(struct imapc_connection *conn);
+enum imapc_capability
+imapc_connection_get_capabilities(struct imapc_connection *conn);
+
+struct imapc_client_mailbox *
+imapc_connection_get_mailbox(struct imapc_connection *conn);
+
+void imapc_connection_idle(struct imapc_connection *conn);
+
+#endif
diff --git a/src/lib-imap-client/imapc-msgmap.c b/src/lib-imap-client/imapc-msgmap.c
new file mode 100644
index 0000000..6280a24
--- /dev/null
+++ b/src/lib-imap-client/imapc-msgmap.c
@@ -0,0 +1,89 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "imapc-msgmap.h"
+#include "sort.h"
+
+struct imapc_msgmap {
+	ARRAY_TYPE(uint32_t) uids;
+	uint32_t uid_next;
+};
+
+struct imapc_msgmap *imapc_msgmap_init(void)
+{
+	struct imapc_msgmap *msgmap;
+
+	msgmap = i_new(struct imapc_msgmap, 1);
+	i_array_init(&msgmap->uids, 128);
+	msgmap->uid_next = 1;
+	return msgmap;
+}
+
+void imapc_msgmap_deinit(struct imapc_msgmap **_msgmap)
+{
+	struct imapc_msgmap *msgmap = *_msgmap;
+
+	*_msgmap = NULL;
+
+	array_free(&msgmap->uids);
+	i_free(msgmap);
+}
+
+uint32_t imapc_msgmap_count(struct imapc_msgmap *msgmap)
+{
+	return array_count(&msgmap->uids);
+}
+
+uint32_t imapc_msgmap_uidnext(struct imapc_msgmap *msgmap)
+{
+	return msgmap->uid_next;
+}
+
+uint32_t imapc_msgmap_rseq_to_uid(struct imapc_msgmap *msgmap, uint32_t rseq)
+{
+	const uint32_t *uidp;
+
+	uidp = array_idx(&msgmap->uids, rseq-1);
+	return *uidp;
+}
+
+bool imapc_msgmap_uid_to_rseq(struct imapc_msgmap *msgmap,
+			      uint32_t uid, uint32_t *rseq_r)
+{
+	const uint32_t *p, *first;
+
+	p = array_bsearch(&msgmap->uids, &uid, uint32_cmp);
+	if (p == NULL) {
+		*rseq_r = 0;
+		return FALSE;
+	}
+
+	first = array_front(&msgmap->uids);
+	*rseq_r = (p - first) + 1;
+	return TRUE;
+}
+
+void imapc_msgmap_append(struct imapc_msgmap *msgmap,
+			 uint32_t rseq, uint32_t uid)
+{
+	i_assert(rseq == imapc_msgmap_count(msgmap) + 1);
+	i_assert(uid >= msgmap->uid_next);
+
+	msgmap->uid_next = uid + 1;
+	array_push_back(&msgmap->uids, &uid);
+}
+
+void imapc_msgmap_expunge(struct imapc_msgmap *msgmap, uint32_t rseq)
+{
+	i_assert(rseq > 0);
+	i_assert(rseq <= imapc_msgmap_count(msgmap));
+
+	array_delete(&msgmap->uids, rseq-1, 1);
+}
+
+void imapc_msgmap_reset(struct imapc_msgmap *msgmap)
+{
+	array_clear(&msgmap->uids);
+	msgmap->uid_next = 1;
+}
diff --git a/src/lib-imap-client/imapc-msgmap.h b/src/lib-imap-client/imapc-msgmap.h
new file mode 100644
index 0000000..934bf97
--- /dev/null
+++ b/src/lib-imap-client/imapc-msgmap.h
@@ -0,0 +1,18 @@
+#ifndef IMAPC_MSGMAP_H
+#define IMAPC_MSGMAP_H
+
+struct imapc_msgmap *imapc_msgmap_init(void);
+void imapc_msgmap_deinit(struct imapc_msgmap **msgmap);
+
+uint32_t imapc_msgmap_count(struct imapc_msgmap *msgmap);
+uint32_t imapc_msgmap_uidnext(struct imapc_msgmap *msgmap);
+uint32_t imapc_msgmap_rseq_to_uid(struct imapc_msgmap *msgmap, uint32_t rseq);
+bool imapc_msgmap_uid_to_rseq(struct imapc_msgmap *msgmap,
+			      uint32_t uid, uint32_t *rseq_r);
+
+void imapc_msgmap_append(struct imapc_msgmap *msgmap,
+			 uint32_t rseq, uint32_t uid);
+void imapc_msgmap_expunge(struct imapc_msgmap *msgmap, uint32_t rseq);
+void imapc_msgmap_reset(struct imapc_msgmap *msgmap);
+
+#endif
diff --git a/src/lib-imap-client/test-imapc-client.c b/src/lib-imap-client/test-imapc-client.c
new file mode 100644
index 0000000..c8953f0
--- /dev/null
+++ b/src/lib-imap-client/test-imapc-client.c
@@ -0,0 +1,901 @@
+/* Copyright (c) 2017-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "hostpid.h"
+#include "net.h"
+#include "istream.h"
+#include "ostream.h"
+#include "ioloop.h"
+#include "unlink-directory.h"
+#include "sleep.h"
+#include "test-common.h"
+#include "test-subprocess.h"
+#include "imapc-client-private.h"
+
+#include <stdio.h>
+#include <unistd.h>
+
+#define SERVER_KILL_TIMEOUT_SECS    20
+
+#define IMAPC_COMMAND_STATE_INVALID (enum imapc_command_state)-1
+
+typedef void test_server_init_t(void);
+typedef void test_client_init_t(void);
+
+struct test_server {
+	in_port_t port;
+	pid_t pid;
+
+	int fd_listen, fd;
+	struct istream *input;
+	struct ostream *output;
+};
+
+static struct ip_addr bind_ip;
+static struct test_server server;
+static struct imapc_client *imapc_client;
+static enum imapc_command_state imapc_login_last_reply;
+static ARRAY(enum imapc_command_state) imapc_cmd_last_replies;
+static bool debug = FALSE;
+
+static void main_deinit(void);
+
+/*
+ * Test client
+ */
+
+static struct imapc_client_settings test_imapc_default_settings = {
+	.host = "127.0.0.1",
+	.username = "testuser",
+	.password = "testpass",
+
+	.dns_client_socket_path = "",
+	.temp_path_prefix = ".test-tmp/",
+	.rawlog_dir = "",
+
+	.connect_timeout_msecs = 5000,
+	.connect_retry_count = 3,
+	.connect_retry_interval_msecs = 10,
+
+	.max_idle_time = 10000,
+};
+
+static enum imapc_command_state test_imapc_cmd_last_reply_pop(void)
+{
+	const enum imapc_command_state *replies;
+	enum imapc_command_state reply;
+	unsigned int count;
+
+	replies = array_get(&imapc_cmd_last_replies, &count);
+	if (count == 0)
+		return IMAPC_COMMAND_STATE_INVALID;
+	reply = replies[0];
+	array_pop_front(&imapc_cmd_last_replies);
+	return reply;
+}
+
+static bool test_imapc_cmd_last_reply_expect(enum imapc_command_state state)
+{
+	if (array_count(&imapc_cmd_last_replies) == 0)
+		imapc_client_run(imapc_client);
+	return test_imapc_cmd_last_reply_pop() == state;
+}
+
+static void imapc_login_callback(const struct imapc_command_reply *reply,
+				 void *context ATTR_UNUSED)
+{
+	if (debug) {
+		i_debug("Login reply: %s %s",
+			imapc_command_state_names[reply->state],
+			reply->text_full);
+	}
+	imapc_login_last_reply = reply->state;
+	imapc_client_stop(imapc_client);
+}
+
+static void imapc_command_callback(const struct imapc_command_reply *reply,
+				   void *context ATTR_UNUSED)
+{
+	if (debug) {
+		i_debug("Command reply: %s %s",
+			imapc_command_state_names[reply->state],
+			reply->text_full);
+	}
+	array_push_back(&imapc_cmd_last_replies, &reply->state);
+	imapc_client_stop(imapc_client);
+}
+
+static void imapc_reopen_callback(void *context)
+{
+	struct imapc_client_mailbox *box = context;
+	struct imapc_command *cmd;
+
+	cmd = imapc_client_mailbox_cmd(box, imapc_command_callback, NULL);
+	imapc_command_set_flags(cmd, IMAPC_COMMAND_FLAG_SELECT);
+	imapc_command_send(cmd, "SELECT");
+}
+
+/*
+ * Test server
+ */
+
+static bool
+test_imapc_server_expect_full(struct test_server *server,
+			      const char *expected_line)
+{
+	const char *line = i_stream_read_next_line(server->input);
+
+	if (debug)
+		i_debug("Received: %s", (line == NULL ? "<EOF>" : line));
+
+	if (line == NULL) {
+		printf("imapc client disconnected unexpectedly: %s\n",
+		       i_stream_get_error(server->input));
+		return FALSE;
+	} else if (strcmp(line, expected_line) != 0) {
+		printf("imapc client sent '%s' when expecting '%s'\n",
+		       line, expected_line);
+		return FALSE;
+	} else {
+		return TRUE;
+	}
+}
+
+static bool test_imapc_server_expect(const char *expected_line)
+{
+	return test_imapc_server_expect_full(&server, expected_line);
+}
+
+static void
+test_server_wait_connection(struct test_server *server, bool send_banner)
+{
+	if (debug)
+		i_debug("Waiting for connection");
+
+	server->fd = net_accept(server->fd_listen, NULL, NULL);
+	i_assert(server->fd >= 0);
+
+	if (debug)
+		i_debug("Client connected");
+
+	fd_set_nonblock(server->fd, FALSE);
+	server->input = i_stream_create_fd(server->fd, SIZE_MAX);
+	server->output = o_stream_create_fd(server->fd, SIZE_MAX);
+	o_stream_set_no_error_handling(server->output, TRUE);
+
+	if (send_banner) {
+		o_stream_nsend_str(server->output,
+			"* OK [CAPABILITY IMAP4rev1 UNSELECT QUOTA] ready\r\n");
+	}
+}
+
+static void test_server_disconnect(struct test_server *server)
+{
+	if (debug)
+		i_debug("Disconnecting client");
+
+	i_stream_unref(&server->input);
+	o_stream_unref(&server->output);
+	i_close_fd(&server->fd);
+}
+
+static void test_server_disconnect_and_wait(bool send_banner)
+{
+	test_server_disconnect(&server);
+	test_server_wait_connection(&server, send_banner);
+}
+
+/*
+ * Test processes
+ */
+
+static int test_open_server_fd(in_port_t *bind_port)
+{
+	int fd = net_listen(&bind_ip, bind_port, 128);
+	if (debug)
+		i_debug("server listening on %u", *bind_port);
+	if (fd == -1) {
+		i_fatal("listen(%s:%u) failed: %m",
+			net_ip2addr(&bind_ip), *bind_port);
+	}
+	fd_set_nonblock(fd, FALSE);
+	return fd;
+}
+
+static int test_run_server(test_server_init_t *server_test)
+{
+	struct ioloop *ioloop;
+
+	i_set_failure_prefix("SERVER: ");
+
+	if (debug)
+		i_debug("PID=%s", my_pid);
+
+	ioloop = io_loop_create();
+	if (server_test != NULL)
+		server_test();
+	test_server_disconnect(&server);
+	io_loop_destroy(&ioloop);
+
+	if (debug)
+		i_debug("Terminated");
+
+	i_close_fd(&server.fd_listen);
+	main_deinit();
+	return 0;
+}
+
+static void
+test_run_client(const struct imapc_client_settings *client_set,
+		test_client_init_t *client_test)
+{
+	struct ioloop *ioloop;
+
+	i_set_failure_prefix("CLIENT: ");
+
+	if (debug)
+		i_debug("PID=%s", my_pid);
+
+	i_sleep_msecs(100); /* wait a little for server setup */
+
+	ioloop = io_loop_create();
+	imapc_client = imapc_client_init(client_set, NULL);
+	client_test();
+	imapc_client_logout(imapc_client);
+	test_assert(array_count(&imapc_cmd_last_replies) == 0);
+	if (imapc_client != NULL)
+		imapc_client_deinit(&imapc_client);
+	io_loop_destroy(&ioloop);
+
+	if (debug)
+		i_debug("Terminated");
+}
+
+static void
+test_run_client_server(const struct imapc_client_settings *client_set,
+		       test_client_init_t *client_test,
+		       test_server_init_t *server_test)
+{
+	struct imapc_client_settings client_set_copy = *client_set;
+	const char *error;
+
+	imapc_client_cmd_tag_counter = 0;
+	imapc_login_last_reply = IMAPC_COMMAND_STATE_INVALID;
+	t_array_init(&imapc_cmd_last_replies, 4);
+
+	i_zero(&server);
+	server.pid = (pid_t)-1;
+	server.fd = -1;
+	server.fd_listen = test_open_server_fd(&server.port);
+	client_set_copy.port = server.port;
+
+	if (mkdir(client_set->temp_path_prefix, 0700) < 0 && errno != EEXIST)
+		i_fatal("mkdir(%s) failed: %m", client_set->temp_path_prefix);
+
+	if (server_test != NULL) {
+		/* Fork server */
+		test_subprocess_fork(test_run_server, server_test, TRUE);
+	}
+	i_close_fd(&server.fd_listen);
+
+	/* Run client */
+	test_run_client(&client_set_copy, client_test);
+
+	i_unset_failure_prefix();
+	test_subprocess_kill_all(SERVER_KILL_TIMEOUT_SECS);
+	if (unlink_directory(client_set->temp_path_prefix,
+			     UNLINK_DIRECTORY_FLAG_RMDIR, &error) < 0)
+		i_fatal("%s", error);
+}
+
+/*
+ * imapc connect failed
+ */
+
+static void test_imapc_connect_failed_client(void)
+{
+	imapc_client_set_login_callback(imapc_client,
+					imapc_login_callback, NULL);
+	imapc_client_login(imapc_client);
+	/* connection refused & one reconnect */
+	test_expect_errors(2);
+	imapc_client_run(imapc_client);
+	test_expect_no_more_errors();
+	test_assert(imapc_login_last_reply == IMAPC_COMMAND_STATE_DISCONNECTED);
+}
+
+static void test_imapc_connect_failed(void)
+{
+	struct imapc_client_settings set = test_imapc_default_settings;
+
+	test_begin("imapc connect failed");
+	test_run_client_server(&set, test_imapc_connect_failed_client, NULL);
+	test_end();
+}
+
+/*
+ * imapc banner hang
+ */
+
+static void test_imapc_banner_hangs_client(void)
+{
+	imapc_client_set_login_callback(imapc_client,
+					imapc_login_callback, NULL);
+	imapc_client_login(imapc_client);
+	test_expect_errors(2);
+	imapc_client_run(imapc_client);
+	test_expect_no_more_errors();
+	test_assert(imapc_login_last_reply == IMAPC_COMMAND_STATE_DISCONNECTED);
+}
+
+static void test_imapc_banner_hangs_server(void)
+{
+	struct test_server server2 = { .fd_listen = server.fd_listen };
+
+	test_server_wait_connection(&server, FALSE);
+	test_server_wait_connection(&server2, FALSE);
+	test_assert(i_stream_read_next_line(server2.input) == NULL);
+	test_server_disconnect(&server2);
+}
+
+static void test_imapc_banner_hangs(void)
+{
+	struct imapc_client_settings set = test_imapc_default_settings;
+	set.connect_timeout_msecs = 500;
+
+	test_begin("imapc banner hangs");
+	test_run_client_server(&set, test_imapc_banner_hangs_client,
+			       test_imapc_banner_hangs_server);
+	test_end();
+}
+
+/*
+ * imapc login hangs
+ */
+
+static void test_imapc_login_hangs_client(void)
+{
+	imapc_client_set_login_callback(imapc_client,
+					imapc_login_callback, NULL);
+	imapc_client_login(imapc_client);
+	/* run the first login */
+	test_expect_error_string("Authentication timed out");
+	imapc_client_run(imapc_client);
+	test_expect_no_more_errors();
+	/* imapc_login_callback() has stopped us. run the second reconnect
+	   login. */
+	test_expect_error_string("Authentication timed out");
+	imapc_client_run(imapc_client);
+	test_expect_no_more_errors();
+	test_assert(imapc_login_last_reply == IMAPC_COMMAND_STATE_DISCONNECTED);
+}
+
+static void test_imapc_login_hangs_server(void)
+{
+	struct test_server server2 = { .fd_listen = server.fd_listen };
+
+	test_server_wait_connection(&server, TRUE);
+	test_assert(test_imapc_server_expect(
+		"1 LOGIN \"testuser\" \"testpass\""));
+
+	test_server_wait_connection(&server2, TRUE);
+	test_assert(test_imapc_server_expect_full(
+		&server2, "2 LOGIN \"testuser\" \"testpass\""));
+
+	test_assert(i_stream_read_next_line(server2.input) == NULL);
+	test_server_disconnect(&server2);
+}
+
+static void test_imapc_login_hangs(void)
+{
+	struct imapc_client_settings set = test_imapc_default_settings;
+	set.connect_timeout_msecs = 500;
+
+	test_begin("imapc login hangs");
+	test_run_client_server(&set, test_imapc_login_hangs_client,
+			       test_imapc_login_hangs_server);
+	test_end();
+}
+
+/*
+ * imapc login fails
+ */
+
+static void test_imapc_login_fails_client(void)
+{
+	imapc_client_set_login_callback(imapc_client,
+					imapc_login_callback, NULL);
+	imapc_client_login(imapc_client);
+	test_expect_error_string("Authentication failed: Test login failed");
+	imapc_client_run(imapc_client);
+	test_expect_no_more_errors();
+	test_assert(imapc_login_last_reply == IMAPC_COMMAND_STATE_AUTH_FAILED);
+}
+
+static void test_imapc_login_fails_server(void)
+{
+	test_server_wait_connection(&server, TRUE);
+	test_assert(test_imapc_server_expect(
+		"1 LOGIN \"testuser\" \"testpass\""));
+	o_stream_nsend_str(server.output, "1 NO Test login failed\r\n");
+}
+
+static void test_imapc_login_fails(void)
+{
+	struct imapc_client_settings set = test_imapc_default_settings;
+
+	test_begin("imapc login fails");
+	test_run_client_server(&set, test_imapc_login_fails_client,
+			       test_imapc_login_fails_server);
+	test_end();
+}
+
+/*
+ * imapc reconnect
+ */
+
+static void test_imapc_reconnect_client(void)
+{
+	struct imapc_command *cmd;
+
+	/* login to server */
+	imapc_client_set_login_callback(imapc_client,
+					imapc_login_callback, NULL);
+	imapc_client_login(imapc_client);
+	imapc_client_run(imapc_client);
+	test_assert(imapc_login_last_reply == IMAPC_COMMAND_STATE_OK);
+	imapc_login_last_reply = IMAPC_COMMAND_STATE_INVALID;
+
+	/* disconnect */
+	cmd = imapc_client_cmd(imapc_client, imapc_command_callback, NULL);
+	imapc_command_send(cmd, "DISCONNECT");
+	test_expect_error_string("reconnecting");
+	imapc_client_run(imapc_client);
+	test_expect_no_more_errors();
+	test_assert(test_imapc_cmd_last_reply_pop() ==
+		    IMAPC_COMMAND_STATE_DISCONNECTED);
+
+	/* we should be reconnected now. try a command. */
+	cmd = imapc_client_cmd(imapc_client, imapc_command_callback, NULL);
+	imapc_command_send(cmd, "NOOP");
+	imapc_client_run(imapc_client);
+	test_assert(imapc_login_last_reply == IMAPC_COMMAND_STATE_INVALID);
+	test_assert(test_imapc_cmd_last_reply_pop() == IMAPC_COMMAND_STATE_OK);
+}
+
+static void test_imapc_reconnect_server(void)
+{
+	test_server_wait_connection(&server, TRUE);
+	test_assert(test_imapc_server_expect(
+		"1 LOGIN \"testuser\" \"testpass\""));
+	o_stream_nsend_str(server.output, "1 OK \r\n");
+
+	test_assert(test_imapc_server_expect("2 DISCONNECT"));
+	test_server_disconnect_and_wait(TRUE);
+
+	test_assert(test_imapc_server_expect(
+		"4 LOGIN \"testuser\" \"testpass\""));
+	o_stream_nsend_str(server.output, "4 OK \r\n");
+	test_assert(test_imapc_server_expect("3 NOOP"));
+	o_stream_nsend_str(server.output, "3 OK \r\n");
+
+	test_assert(test_imapc_server_expect("5 LOGOUT"));
+	o_stream_nsend_str(server.output, "5 OK \r\n");
+
+	test_assert(i_stream_read_next_line(server.input) == NULL);
+}
+
+static void test_imapc_reconnect(void)
+{
+	struct imapc_client_settings set = test_imapc_default_settings;
+
+	test_begin("imapc reconnect");
+	test_run_client_server(&set, test_imapc_reconnect_client,
+			       test_imapc_reconnect_server);
+	test_end();
+}
+
+/*
+ * imapc reconnect resend commands
+ */
+
+static void test_imapc_reconnect_resend_cmds_client(void)
+{
+	struct imapc_command *cmd;
+
+	/* login to server */
+	imapc_client_set_login_callback(imapc_client,
+					imapc_login_callback, NULL);
+	imapc_client_login(imapc_client);
+	imapc_client_run(imapc_client);
+	test_assert(imapc_login_last_reply == IMAPC_COMMAND_STATE_OK);
+	imapc_login_last_reply = IMAPC_COMMAND_STATE_INVALID;
+
+	/* send two commands */
+	cmd = imapc_client_cmd(imapc_client, imapc_command_callback, NULL);
+	imapc_command_set_flags(cmd, IMAPC_COMMAND_FLAG_RETRIABLE);
+	imapc_command_send(cmd, "RETRY1");
+	cmd = imapc_client_cmd(imapc_client, imapc_command_callback, NULL);
+	imapc_command_set_flags(cmd, IMAPC_COMMAND_FLAG_RETRIABLE);
+	imapc_command_send(cmd, "RETRY2");
+
+	/* disconnect & reconnect automatically */
+	cmd = imapc_client_cmd(imapc_client, imapc_command_callback, NULL);
+	imapc_command_send(cmd, "DISCONNECT");
+	test_expect_error_string("reconnecting");
+	imapc_client_run(imapc_client);
+	test_expect_no_more_errors();
+	test_assert(test_imapc_cmd_last_reply_expect(
+		IMAPC_COMMAND_STATE_DISCONNECTED));
+
+	/* continue reconnection */
+	test_assert(test_imapc_cmd_last_reply_expect(IMAPC_COMMAND_STATE_OK));
+	test_assert(test_imapc_cmd_last_reply_expect(IMAPC_COMMAND_STATE_OK));
+}
+
+static void test_imapc_reconnect_resend_cmds_server(void)
+{
+	test_server_wait_connection(&server, TRUE);
+	test_assert(test_imapc_server_expect(
+		"1 LOGIN \"testuser\" \"testpass\""));
+	o_stream_nsend_str(server.output, "1 OK \r\n");
+
+	test_assert(test_imapc_server_expect("2 RETRY1"));
+	test_assert(test_imapc_server_expect("3 RETRY2"));
+	test_assert(test_imapc_server_expect("4 DISCONNECT"));
+	test_server_disconnect_and_wait(TRUE);
+
+	test_assert(test_imapc_server_expect(
+		"5 LOGIN \"testuser\" \"testpass\""));
+	o_stream_nsend_str(server.output, "5 OK \r\n");
+	test_assert(test_imapc_server_expect("2 RETRY1"));
+	o_stream_nsend_str(server.output, "2 OK \r\n");
+	test_assert(test_imapc_server_expect("3 RETRY2"));
+	o_stream_nsend_str(server.output, "3 OK \r\n");
+
+	test_assert(test_imapc_server_expect("6 LOGOUT"));
+	o_stream_nsend_str(server.output, "6 OK \r\n");
+
+	test_assert(i_stream_read_next_line(server.input) == NULL);
+}
+
+static void test_imapc_reconnect_resend_commands(void)
+{
+	struct imapc_client_settings set = test_imapc_default_settings;
+
+	test_begin("imapc reconnect resend commands");
+	test_run_client_server(&set, test_imapc_reconnect_resend_cmds_client,
+			       test_imapc_reconnect_resend_cmds_server);
+	test_end();
+}
+
+/*
+ * imapc reconnect resend commands failed
+ */
+
+static void test_imapc_reconnect_resend_cmds_failed_client(void)
+{
+	struct imapc_command *cmd;
+
+	/* login to server */
+	imapc_client_set_login_callback(imapc_client,
+					imapc_login_callback, NULL);
+	imapc_client_login(imapc_client);
+	imapc_client_run(imapc_client);
+	test_assert(imapc_login_last_reply == IMAPC_COMMAND_STATE_OK);
+	imapc_login_last_reply = IMAPC_COMMAND_STATE_INVALID;
+
+	/* send two commands */
+	cmd = imapc_client_cmd(imapc_client, imapc_command_callback, NULL);
+	imapc_command_set_flags(cmd, IMAPC_COMMAND_FLAG_RETRIABLE);
+	imapc_command_send(cmd, "RETRY1");
+	cmd = imapc_client_cmd(imapc_client, imapc_command_callback, NULL);
+	imapc_command_set_flags(cmd, IMAPC_COMMAND_FLAG_RETRIABLE);
+	imapc_command_send(cmd, "RETRY2");
+
+	/* disconnect & try to reconnect automatically */
+	cmd = imapc_client_cmd(imapc_client, imapc_command_callback, NULL);
+	imapc_command_send(cmd, "DISCONNECT");
+	test_expect_error_string("reconnecting");
+	imapc_client_run(imapc_client);
+	test_expect_no_more_errors();
+	test_assert(test_imapc_cmd_last_reply_expect(
+		IMAPC_COMMAND_STATE_DISCONNECTED));
+	test_expect_error_string("timed out");
+	test_assert(test_imapc_cmd_last_reply_expect(
+		IMAPC_COMMAND_STATE_DISCONNECTED));
+	test_expect_no_more_errors();
+	test_assert(test_imapc_cmd_last_reply_expect(
+		IMAPC_COMMAND_STATE_DISCONNECTED));
+}
+
+static void test_imapc_reconnect_resend_cmds_failed_server(void)
+{
+	test_server_wait_connection(&server, TRUE);
+	test_assert(test_imapc_server_expect(
+		"1 LOGIN \"testuser\" \"testpass\""));
+	o_stream_nsend_str(server.output, "1 OK \r\n");
+
+	test_assert(test_imapc_server_expect("2 RETRY1"));
+	test_assert(test_imapc_server_expect("3 RETRY2"));
+	test_assert(test_imapc_server_expect("4 DISCONNECT"));
+	test_server_disconnect(&server);
+
+	i_sleep_intr_secs(60);
+}
+
+static void test_imapc_reconnect_resend_commands_failed(void)
+{
+	struct imapc_client_settings set = test_imapc_default_settings;
+	set.connect_timeout_msecs = 500;
+
+	test_begin("imapc reconnect resend commands failed");
+	test_run_client_server(&set,
+			       test_imapc_reconnect_resend_cmds_failed_client,
+			       test_imapc_reconnect_resend_cmds_failed_server);
+	test_end();
+}
+
+/*
+ * imapc reconnect mailbox
+ */
+
+static void test_imapc_reconnect_mailbox_client(void)
+{
+	struct imapc_command *cmd;
+	struct imapc_client_mailbox *box;
+
+	/* login to server */
+	imapc_client_set_login_callback(imapc_client,
+					imapc_login_callback, NULL);
+	imapc_client_login(imapc_client);
+	imapc_client_run(imapc_client);
+	test_assert(imapc_login_last_reply == IMAPC_COMMAND_STATE_OK);
+	imapc_login_last_reply = IMAPC_COMMAND_STATE_INVALID;
+
+	/* select a mailbox */
+	box = imapc_client_mailbox_open(imapc_client, NULL);
+	imapc_client_mailbox_set_reopen_cb(box, imapc_reopen_callback, box);
+
+	cmd = imapc_client_mailbox_cmd(box, imapc_command_callback, NULL);
+	imapc_command_set_flags(cmd, IMAPC_COMMAND_FLAG_SELECT);
+	imapc_command_send(cmd, "SELECT");
+	imapc_client_run(imapc_client);
+	test_assert(test_imapc_cmd_last_reply_expect(IMAPC_COMMAND_STATE_OK));
+
+	/* send a command */
+	cmd = imapc_client_mailbox_cmd(box, imapc_command_callback, NULL);
+	imapc_command_set_flags(cmd, IMAPC_COMMAND_FLAG_RETRIABLE);
+	imapc_command_send(cmd, "RETRY");
+
+	/* disconnect & reconnect automatically */
+	cmd = imapc_client_cmd(imapc_client, imapc_command_callback, NULL);
+	imapc_command_send(cmd, "DISCONNECT");
+	test_expect_error_string("reconnecting");
+	imapc_client_run(imapc_client);
+	test_expect_no_more_errors();
+	test_assert(test_imapc_cmd_last_reply_expect(
+		IMAPC_COMMAND_STATE_DISCONNECTED));
+
+	/* continue reconnection */
+	test_assert(test_imapc_cmd_last_reply_expect(IMAPC_COMMAND_STATE_OK));
+	test_assert(test_imapc_cmd_last_reply_expect(IMAPC_COMMAND_STATE_OK));
+
+	imapc_client_mailbox_close(&box);
+}
+
+static void test_imapc_reconnect_mailbox_server(void)
+{
+	test_server_wait_connection(&server, TRUE);
+	test_assert(test_imapc_server_expect(
+		"1 LOGIN \"testuser\" \"testpass\""));
+	o_stream_nsend_str(server.output, "1 OK \r\n");
+
+	test_assert(test_imapc_server_expect("2 SELECT"));
+	o_stream_nsend_str(server.output, "2 OK \r\n");
+
+	test_assert(test_imapc_server_expect("3 RETRY"));
+	test_assert(test_imapc_server_expect("4 DISCONNECT"));
+	test_server_disconnect_and_wait(TRUE);
+
+	test_assert(test_imapc_server_expect(
+		"5 LOGIN \"testuser\" \"testpass\""));
+	o_stream_nsend_str(server.output, "5 OK \r\n");
+	test_assert(test_imapc_server_expect("6 SELECT"));
+	o_stream_nsend_str(server.output, "6 OK \r\n");
+	test_assert(test_imapc_server_expect("3 RETRY"));
+	o_stream_nsend_str(server.output, "3 OK \r\n");
+
+	test_assert(test_imapc_server_expect("7 LOGOUT"));
+	o_stream_nsend_str(server.output, "7 OK \r\n");
+
+	test_assert(i_stream_read_next_line(server.input) == NULL);
+}
+
+static void test_imapc_reconnect_mailbox(void)
+{
+	struct imapc_client_settings set = test_imapc_default_settings;
+
+	test_begin("imapc reconnect mailbox");
+	test_run_client_server(&set, test_imapc_reconnect_mailbox_client,
+			       test_imapc_reconnect_mailbox_server);
+	test_end();
+}
+
+/*
+ * imapc_client_get_capabilities()
+ */
+
+static void test_imapc_client_get_capabilities_client(void)
+{
+	enum imapc_capability capabilities;
+
+	test_assert(imapc_client_get_capabilities(imapc_client, &capabilities) == 0);
+	test_assert(capabilities == (IMAPC_CAPABILITY_IMAP4REV1 |
+				     IMAPC_CAPABILITY_UNSELECT |
+				     IMAPC_CAPABILITY_QUOTA));
+}
+
+static void test_imapc_client_get_capabilities_server(void)
+{
+	test_server_wait_connection(&server, TRUE);
+	test_assert(test_imapc_server_expect(
+		"1 LOGIN \"testuser\" \"testpass\""));
+	o_stream_nsend_str(server.output, "1 OK \r\n");
+
+	test_assert(test_imapc_server_expect("2 LOGOUT"));
+	o_stream_nsend_str(server.output, "2 OK \r\n");
+
+	test_assert(i_stream_read_next_line(server.input) == NULL);
+}
+
+static void test_imapc_client_get_capabilities(void)
+{
+	struct imapc_client_settings set = test_imapc_default_settings;
+
+	test_begin("imapc_client_get_capabilities()");
+	test_run_client_server(&set, test_imapc_client_get_capabilities_client,
+			       test_imapc_client_get_capabilities_server);
+	test_end();
+}
+
+/*
+ * imapc_client_get_capabilities() reconnected
+ */
+
+static void test_imapc_client_get_capabilities_reconnected_client(void)
+{
+	enum imapc_capability capabilities;
+
+	test_expect_error_string("Server disconnected unexpectedly");
+	test_assert(imapc_client_get_capabilities(imapc_client,
+						  &capabilities) == 0);
+	test_assert(capabilities == (IMAPC_CAPABILITY_IMAP4REV1 |
+				     IMAPC_CAPABILITY_UNSELECT |
+				     IMAPC_CAPABILITY_QUOTA));
+	test_expect_no_more_errors();
+}
+
+static void test_imapc_client_get_capabilities_reconnected_server(void)
+{
+	test_server_wait_connection(&server, TRUE);
+	test_server_disconnect_and_wait(TRUE);
+
+	test_assert(test_imapc_server_expect(
+		"2 LOGIN \"testuser\" \"testpass\""));
+	o_stream_nsend_str(server.output, "2 OK \r\n");
+
+	test_assert(test_imapc_server_expect("3 LOGOUT"));
+	o_stream_nsend_str(server.output, "3 OK \r\n");
+
+	test_assert(i_stream_read_next_line(server.input) == NULL);
+}
+
+static void test_imapc_client_get_capabilities_reconnected(void)
+{
+	struct imapc_client_settings set = test_imapc_default_settings;
+
+	test_begin("imapc_client_get_capabilities() reconnected");
+
+	test_run_client_server(
+		&set, test_imapc_client_get_capabilities_reconnected_client,
+		test_imapc_client_get_capabilities_reconnected_server);
+	test_end();
+}
+
+/*
+ * imapc_client_get_capabilities() disconnected
+ */
+
+static void test_imapc_client_get_capabilities_disconnected_client(void)
+{
+	enum imapc_capability capabilities;
+
+	test_expect_errors(2);
+	test_assert(imapc_client_get_capabilities(imapc_client,
+						  &capabilities) < 0);
+	test_expect_no_more_errors();
+}
+
+static void test_imapc_client_get_capabilities_disconnected_server(void)
+{
+	test_server_wait_connection(&server, TRUE);
+	test_server_disconnect_and_wait(TRUE);
+}
+
+static void test_imapc_client_get_capabilities_disconnected(void)
+{
+	struct imapc_client_settings set = test_imapc_default_settings;
+
+	test_begin("imapc_client_get_capabilities() disconnected");
+
+	test_run_client_server(
+		&set, test_imapc_client_get_capabilities_disconnected_client,
+		test_imapc_client_get_capabilities_disconnected_server);
+	test_end();
+}
+
+/*
+ * Main
+ */
+
+static void main_init(void)
+{
+	/* nothing yet */
+}
+
+static void main_deinit(void)
+{
+	/* nothing yet; also called from sub-processes */
+}
+
+int main(int argc ATTR_UNUSED, char *argv[])
+{
+	int c;
+	int ret;
+
+	static void (*const test_functions[])(void) = {
+		test_imapc_connect_failed,
+		test_imapc_banner_hangs,
+		test_imapc_login_hangs,
+		test_imapc_login_fails,
+		test_imapc_reconnect,
+		test_imapc_reconnect_resend_commands,
+		test_imapc_reconnect_resend_commands_failed,
+		test_imapc_reconnect_mailbox,
+		test_imapc_client_get_capabilities,
+		test_imapc_client_get_capabilities_reconnected,
+		test_imapc_client_get_capabilities_disconnected,
+		NULL
+	};
+
+	lib_init();
+	main_init();
+
+	while ((c = getopt(argc, argv, "D")) > 0) {
+		switch (c) {
+		case 'D':
+			debug = TRUE;
+			break;
+		default:
+			i_fatal("Usage: %s [-D]", argv[0]);
+		}
+	}
+
+	test_subprocesses_init(debug);
+	test_imapc_default_settings.debug = debug;
+
+	/* listen on localhost */
+	i_zero(&bind_ip);
+	bind_ip.family = AF_INET;
+	bind_ip.u.ip4.s_addr = htonl(INADDR_LOOPBACK);
+
+	ret = test_run(test_functions);
+
+	test_subprocesses_deinit();
+	main_deinit();
+	lib_deinit();
+
+	return ret;
+}
diff --git a/src/lib-imap-storage/Makefile.am b/src/lib-imap-storage/Makefile.am
new file mode 100644
index 0000000..b084653
--- /dev/null
+++ b/src/lib-imap-storage/Makefile.am
@@ -0,0 +1,24 @@
+noinst_LTLIBRARIES = libimap-storage.la
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib \
+	-I$(top_srcdir)/src/lib-test \
+	-I$(top_srcdir)/src/lib-charset \
+	-I$(top_srcdir)/src/lib-mail \
+	-I$(top_srcdir)/src/lib-index \
+	-I$(top_srcdir)/src/lib-storage \
+	-I$(top_srcdir)/src/lib-imap
+
+libimap_storage_la_SOURCES = \
+	imap-msgpart.c \
+	imap-msgpart-url.c \
+	imap-metadata.c
+
+headers = \
+	imap-msgpart.h \
+	imap-msgpart-url.h \
+	imap-metadata.h
+
+pkginc_libdir=$(pkgincludedir)
+pkginc_lib_HEADERS = $(headers)
+
diff --git a/src/lib-imap-storage/Makefile.in b/src/lib-imap-storage/Makefile.in
new file mode 100644
index 0000000..c0750d9
--- /dev/null
+++ b/src/lib-imap-storage/Makefile.in
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+
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+
+# This Makefile.in is free software; the Free Software Foundation
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+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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+
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diff --git a/src/lib-imap-storage/imap-metadata.c b/src/lib-imap-storage/imap-metadata.c
new file mode 100644
index 0000000..eb791a4
--- /dev/null
+++ b/src/lib-imap-storage/imap-metadata.c
@@ -0,0 +1,314 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "mail-storage.h"
+
+#include "imap-metadata.h"
+
+struct imap_metadata_transaction {
+	struct mailbox *box;
+	struct mailbox_transaction_context *trans;
+
+	enum mail_error error;
+	char *error_string;
+
+	bool server:1;
+	bool validated_only:1;
+};
+
+bool imap_metadata_verify_entry_name(const char *name,
+				     const char **client_error_r)
+{
+	unsigned int i;
+	bool ok;
+
+	if (name[0] != '/') {
+		*client_error_r = "Entry name must begin with '/'";
+		return FALSE;
+	}
+	for (i = 0; name[i] != '\0'; i++) {
+		switch (name[i]) {
+		case '/':
+			if (i > 0 && name[i-1] == '/') {
+				*client_error_r = "Entry name can't contain consecutive '/'";
+				return FALSE;
+			}
+			if (name[i+1] == '\0') {
+				*client_error_r = "Entry name can't end with '/'";
+				return FALSE;
+			}
+			break;
+		case '*':
+			*client_error_r = "Entry name can't contain '*'";
+			return FALSE;
+		case '%':
+			*client_error_r = "Entry name can't contain '%'";
+			return FALSE;
+		default:
+			if (name[i] <= 0x19) {
+				*client_error_r = "Entry name can't contain control chars";
+				return FALSE;
+			}
+			break;
+		}
+	}
+	T_BEGIN {
+		const char *prefix, *p = strchr(name+1, '/');
+
+		prefix = p == NULL ? name : t_strdup_until(name, p);
+		ok = strcasecmp(prefix, IMAP_METADATA_PRIVATE_PREFIX) == 0 ||
+			strcasecmp(prefix, IMAP_METADATA_SHARED_PREFIX) == 0;
+	} T_END;
+	if (!ok) {
+		*client_error_r = "Entry name must begin with /private or /shared";
+		return FALSE;
+	}
+	return TRUE;
+}
+
+static void
+imap_metadata_transaction_set_error(struct imap_metadata_transaction *imtrans,
+				    enum mail_error error, const char *string)
+{
+	i_free(imtrans->error_string);
+	imtrans->error_string = i_strdup(string);
+	imtrans->error = error;
+}
+
+static bool
+imap_metadata_entry2key(struct imap_metadata_transaction *imtrans,
+			const char *entry, enum mail_attribute_type *type_r,
+			const char **key_r)
+{
+	const char *key_prefix = (imtrans->server ?
+		MAILBOX_ATTRIBUTE_PREFIX_DOVECOT_PVT_SERVER : NULL);
+
+	/* names are case-insensitive so we'll always lowercase them */
+	entry = t_str_lcase(entry);
+
+	if (str_begins(entry, IMAP_METADATA_PRIVATE_PREFIX)) {
+		*key_r = entry + strlen(IMAP_METADATA_PRIVATE_PREFIX);
+		*type_r = MAIL_ATTRIBUTE_TYPE_PRIVATE;
+	} else {
+		i_assert(str_begins(entry, IMAP_METADATA_SHARED_PREFIX));
+		*key_r = entry + strlen(IMAP_METADATA_SHARED_PREFIX);
+		*type_r = MAIL_ATTRIBUTE_TYPE_SHARED;
+	}
+	if ((*key_r)[0] == '\0') {
+		/* /private or /shared prefix has no value itself */
+	} else {
+		i_assert((*key_r)[0] == '/');
+		*key_r += 1;
+	}
+
+	if (imtrans->validated_only)
+		*type_r |= MAIL_ATTRIBUTE_TYPE_FLAG_VALIDATED;
+
+	if (str_begins(*key_r, MAILBOX_ATTRIBUTE_PREFIX_DOVECOT_PVT)) {
+		/* Dovecot's internal attribute (mailbox or server).
+		   don't allow accessing this. */
+		return FALSE;
+	}
+	/* Add the server-prefix (after checking for the above internal
+	   attribute). */
+	if (key_prefix != NULL)
+		*key_r = t_strconcat(key_prefix, *key_r, NULL);
+	return TRUE;
+}
+
+static int
+imap_metadata_get_mailbox_transaction(struct imap_metadata_transaction *imtrans)
+{
+	if (imtrans->trans != NULL)
+		return 0;
+
+	if (imtrans->box == NULL || mailbox_open(imtrans->box) < 0)
+		return -1;
+	imtrans->trans = mailbox_transaction_begin(imtrans->box,
+			MAILBOX_TRANSACTION_FLAG_EXTERNAL, __func__);
+	return 0;
+}
+
+int imap_metadata_set(struct imap_metadata_transaction *imtrans,
+	const char *entry, const struct mail_attribute_value *value)
+{
+	enum mail_attribute_type type;
+	const char *key;
+
+	if (!imap_metadata_entry2key(imtrans, entry, &type, &key)) {
+		imap_metadata_transaction_set_error(imtrans, MAIL_ERROR_PARAMS,
+			"Internal mailbox attributes cannot be accessed");
+		return -1;
+	}
+
+	if (imap_metadata_get_mailbox_transaction(imtrans) < 0)
+		return -1;
+	return (value->value == NULL && value->value_stream == NULL ?
+		mailbox_attribute_unset(imtrans->trans, type, key) :
+		mailbox_attribute_set(imtrans->trans, type, key, value));
+}
+
+int imap_metadata_unset(struct imap_metadata_transaction *imtrans,
+			const char *entry)
+{
+	struct mail_attribute_value value;
+
+	i_zero(&value);
+	return imap_metadata_set(imtrans, entry, &value);
+}
+
+int imap_metadata_get(struct imap_metadata_transaction *imtrans,
+		      const char *entry, struct mail_attribute_value *value_r)
+{
+	enum mail_attribute_type type;
+	const char *key;
+
+	i_zero(value_r);
+	if (!imap_metadata_entry2key(imtrans, entry, &type, &key))
+		return 0;
+	return mailbox_attribute_get(imtrans->box, type, key, value_r);
+}
+
+int imap_metadata_get_stream(struct imap_metadata_transaction *imtrans,
+		      const char *entry, struct mail_attribute_value *value_r)
+{
+	enum mail_attribute_type type;
+	const char *key;
+
+	i_zero(value_r);
+	if (!imap_metadata_entry2key(imtrans, entry, &type, &key))
+		return 0;
+	return mailbox_attribute_get_stream(imtrans->box, type, key, value_r);
+}
+
+struct imap_metadata_iter {
+	struct mailbox_attribute_iter *iter;
+};
+
+struct imap_metadata_iter *
+imap_metadata_iter_init(struct imap_metadata_transaction *imtrans,
+			const char *entry)
+{
+	struct imap_metadata_iter *iter;
+	enum mail_attribute_type type;
+	const char *key;
+
+	iter = i_new(struct imap_metadata_iter, 1);
+	if (imap_metadata_entry2key(imtrans, entry, &type, &key)) {
+		const char *prefix =
+			key[0] == '\0' ? "" : t_strconcat(key, "/", NULL);
+		iter->iter = mailbox_attribute_iter_init(imtrans->box, type,
+							 prefix);
+	}
+	return iter;
+}
+
+const char *imap_metadata_iter_next(struct imap_metadata_iter *iter)
+{
+	if (iter->iter == NULL)
+		return NULL;
+	return mailbox_attribute_iter_next(iter->iter);
+}
+
+int imap_metadata_iter_deinit(struct imap_metadata_iter **_iter)
+{
+	struct imap_metadata_iter *iter = *_iter;
+	int ret;
+
+	*_iter = NULL;
+
+	if (iter->iter == NULL)
+		ret = 0;
+	else
+		ret = mailbox_attribute_iter_deinit(&iter->iter);
+	i_free(iter);
+	return ret;
+}
+
+struct imap_metadata_transaction *
+imap_metadata_transaction_begin(struct mailbox *box)
+{
+	struct imap_metadata_transaction *imtrans;
+
+	imtrans = i_new(struct imap_metadata_transaction, 1);
+	imtrans->box = box;
+	return imtrans;
+}
+
+struct imap_metadata_transaction *
+imap_metadata_transaction_begin_server(struct mail_user *user)
+{
+	struct mail_namespace *ns;
+	struct mailbox *box;
+	struct imap_metadata_transaction *imtrans;
+
+	ns = mail_namespace_find_inbox(user->namespaces);
+	/* Server metadata shouldn't depend on INBOX's ACLs, so ignore them. */
+	box = mailbox_alloc(ns->list, "INBOX", MAILBOX_FLAG_IGNORE_ACLS |
+			    MAILBOX_FLAG_ATTRIBUTE_SESSION);
+	imtrans = imap_metadata_transaction_begin(box);
+	imtrans->server = TRUE;
+	return imtrans;
+}
+
+void imap_metadata_transaction_validated_only(struct imap_metadata_transaction *imtrans,
+					      bool set)
+{
+	imtrans->validated_only = set;
+}
+
+static void
+imap_metadata_transaction_finish(struct imap_metadata_transaction **_imtrans)
+{
+	struct imap_metadata_transaction *imtrans = *_imtrans;
+
+	if (imtrans->server)
+		mailbox_free(&imtrans->box);
+
+	i_free(imtrans->error_string);
+	i_free(imtrans);
+	*_imtrans = NULL;
+}
+
+int imap_metadata_transaction_commit(
+	struct imap_metadata_transaction **_imtrans,
+	enum mail_error *error_code_r, const char **client_error_r)
+{
+	struct imap_metadata_transaction *imtrans = *_imtrans;
+	int ret = 0;
+
+	if (imtrans->trans != NULL) {
+		const char *error = NULL;
+		ret = mailbox_transaction_commit(&imtrans->trans);
+		if (ret < 0)
+			error = mailbox_get_last_error(imtrans->box, error_code_r);
+		if (client_error_r != NULL)
+			*client_error_r = error;
+	}
+	imap_metadata_transaction_finish(_imtrans);
+	return ret;
+}
+
+void imap_metadata_transaction_rollback(
+	struct imap_metadata_transaction **_imtrans)
+{
+	struct imap_metadata_transaction *imtrans = *_imtrans;
+
+	if (imtrans->trans != NULL)
+		mailbox_transaction_rollback(&imtrans->trans);
+	imap_metadata_transaction_finish(_imtrans);
+}
+
+const char *
+imap_metadata_transaction_get_last_error(
+	struct imap_metadata_transaction *imtrans,
+	enum mail_error *error_code_r)
+{
+	if  (imtrans->error != MAIL_ERROR_NONE) {
+		if (error_code_r != NULL)
+			*error_code_r = imtrans->error;
+		return imtrans->error_string;
+	}
+	i_assert(imtrans->box != NULL);
+	return mailbox_get_last_error(imtrans->box, error_code_r);
+}
diff --git a/src/lib-imap-storage/imap-metadata.h b/src/lib-imap-storage/imap-metadata.h
new file mode 100644
index 0000000..ef88e61
--- /dev/null
+++ b/src/lib-imap-storage/imap-metadata.h
@@ -0,0 +1,61 @@
+#ifndef IMAP_METADATA_H
+#define IMAP_METADATA_H
+
+#define IMAP_METADATA_PRIVATE_PREFIX "/private"
+#define IMAP_METADATA_SHARED_PREFIX "/shared"
+
+struct imap_metadata_iter;
+struct imap_metadata_transaction;
+
+/* Checks whether IMAP metadata entry name is valid */
+bool imap_metadata_verify_entry_name(
+	const char *name, const char **client_error_r);
+
+/* Set IMAP metadata entry to value. */
+int imap_metadata_set(struct imap_metadata_transaction *imtrans,
+	const char *entry, const struct mail_attribute_value *value);
+/* Delete IMAP metadata entry. This is just a wrapper to
+   imap_metadata_set() with value->value=NULL. */
+int imap_metadata_unset(struct imap_metadata_transaction *imtrans,
+	const char *entry);
+/* Returns value for IMAP metadata entry. Returns 1 if value was returned,
+   0 if value wasn't found (set to NULL), -1 if error */
+int imap_metadata_get(struct imap_metadata_transaction *imtrans,
+	const char *entry, struct mail_attribute_value *value_r);
+/* Same as imap_metadata_get(), but the returned value may be either an
+   input stream or a string. */
+int imap_metadata_get_stream(struct imap_metadata_transaction *imtrans,
+	const char *entry, struct mail_attribute_value *value_r);
+
+/* Iterate through IMAP metadata entries names under the specified entry. */
+struct imap_metadata_iter *
+imap_metadata_iter_init(struct imap_metadata_transaction *imtrans,
+	const char *entry);
+/* Returns the next IMAP metadata entry name or NULL if there are no more
+   entries. */
+const char *imap_metadata_iter_next(struct imap_metadata_iter *iter);
+int imap_metadata_iter_deinit(struct imap_metadata_iter **_iter);
+
+struct imap_metadata_transaction *
+imap_metadata_transaction_begin(struct mailbox *box);
+struct imap_metadata_transaction *
+imap_metadata_transaction_begin_mailbox(struct mail_user *user,
+					const char *mailbox);
+struct imap_metadata_transaction *
+imap_metadata_transaction_begin_server(struct mail_user *user);
+
+/* Allow access only to validated attributes within this transaction. */
+void imap_metadata_transaction_validated_only(struct imap_metadata_transaction *imtrans,
+					      bool set);
+
+int imap_metadata_transaction_commit(
+	struct imap_metadata_transaction **_imtrans,
+	enum mail_error *error_code_r, const char **client_error_r);
+void imap_metadata_transaction_rollback(
+	struct imap_metadata_transaction **_imtrans);
+const char *
+imap_metadata_transaction_get_last_error(
+	struct imap_metadata_transaction *imtrans,
+	enum mail_error *error_code_r);
+
+#endif
diff --git a/src/lib-imap-storage/imap-msgpart-url.c b/src/lib-imap-storage/imap-msgpart-url.c
new file mode 100644
index 0000000..2469dd3
--- /dev/null
+++ b/src/lib-imap-storage/imap-msgpart-url.c
@@ -0,0 +1,287 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "net.h"
+#include "istream.h"
+#include "message-parser.h"
+#include "mail-storage.h"
+#include "mail-namespace.h"
+#include "imap-url.h"
+#include "imap-msgpart.h"
+#include "imap-msgpart-url.h"
+
+struct imap_msgpart_url {
+	char *mailbox;
+	uint32_t uidvalidity;
+	uint32_t uid;
+	char *section;
+	uoff_t partial_offset, partial_size;
+
+	struct imap_msgpart *part;
+
+	struct mail_user *user;
+	struct mailbox *selected_box;
+	struct mailbox *box;
+	struct mailbox_transaction_context *trans;
+	struct mail *mail;
+	
+	struct imap_msgpart_open_result result;
+
+	bool decode_cte_to_binary:1;
+};
+
+int imap_msgpart_url_create(struct mail_user *user, const struct imap_url *url,
+			    struct imap_msgpart_url **mpurl_r,
+			    const char **client_error_r)
+{
+	const char *section = url->section == NULL ? "" : url->section;
+	struct imap_msgpart_url *mpurl;
+	struct imap_msgpart *msgpart;
+
+	if (url->mailbox == NULL || url->uid == 0 ||
+	    url->search_program != NULL) {
+		*client_error_r = "Invalid messagepart IMAP URL";
+		return -1;
+	}
+	if (imap_msgpart_parse(section, &msgpart) < 0) {
+		*client_error_r = "Invalid section";
+		return -1;
+	}
+
+	mpurl = i_new(struct imap_msgpart_url, 1);
+	mpurl->part = msgpart;
+	mpurl->user = user;
+	mpurl->mailbox = i_strdup(url->mailbox);
+	mpurl->uidvalidity = url->uidvalidity;
+	mpurl->uid = url->uid;
+	if (url->section != NULL)
+		mpurl->section = i_strdup(url->section);
+	mpurl->partial_offset = url->partial_offset;
+	mpurl->partial_size = url->partial_size;
+
+	imap_msgpart_set_partial(msgpart, url->partial_offset,
+				 url->partial_size == 0 ?
+				 UOFF_T_MAX : url->partial_size);
+
+	*mpurl_r = mpurl;
+	return 0;
+}
+
+int imap_msgpart_url_parse(struct mail_user *user, struct mailbox *selected_box,
+			   const char *urlstr, struct imap_msgpart_url **mpurl_r,
+			   const char **client_error_r)
+{
+	struct mailbox_status box_status;
+	struct imap_url base_url, *url;
+	const char  *error;
+
+	/* build base url */
+	i_zero(&base_url);
+	if (selected_box != NULL) {
+		mailbox_get_open_status(selected_box, STATUS_UIDVALIDITY,
+					&box_status);
+		base_url.mailbox = mailbox_get_vname(selected_box);
+		base_url.uidvalidity = box_status.uidvalidity;
+	}
+
+	/* parse url */
+	if (imap_url_parse(urlstr, &base_url,
+			   IMAP_URL_PARSE_REQUIRE_RELATIVE, &url, &error) < 0) {
+		*client_error_r = t_strconcat("Invalid IMAP URL: ", error, NULL);
+		return 0;
+	}
+	if (url->mailbox == NULL) {
+		*client_error_r = "Mailbox-relative IMAP URL, but no mailbox selected";
+		return 0;
+	}
+	if (imap_msgpart_url_create(user, url, mpurl_r, client_error_r) < 0)
+		return -1;
+	(*mpurl_r)->selected_box = selected_box;
+	return 1;
+}
+
+struct mailbox *imap_msgpart_url_get_mailbox(struct imap_msgpart_url *mpurl)
+{
+	return mpurl->box;
+}
+
+int imap_msgpart_url_open_mailbox(struct imap_msgpart_url *mpurl,
+				  struct mailbox **box_r, enum mail_error *error_code_r,
+				  const char **client_error_r)
+{
+	struct mailbox_status box_status;
+	enum mailbox_flags flags = MAILBOX_FLAG_READONLY;
+	struct mail_namespace *ns;
+	struct mailbox *box;
+
+	if (mpurl->box != NULL) {
+		*box_r = mpurl->box;
+		*error_code_r = MAIL_ERROR_NONE;
+		return 1;
+	}
+
+	/* find mailbox namespace */
+	ns = mail_namespace_find(mpurl->user->namespaces, mpurl->mailbox);
+
+	/* open mailbox */
+	if (mpurl->selected_box != NULL &&
+	    mailbox_equals(mpurl->selected_box, ns, mpurl->mailbox))
+		box = mpurl->selected_box;
+	else
+		box = mailbox_alloc(ns->list, mpurl->mailbox, flags);
+	if (mailbox_open(box) < 0) {
+		*client_error_r = mail_storage_get_last_error(mailbox_get_storage(box),
+							      error_code_r);
+		if (box != mpurl->selected_box)
+			mailbox_free(&box);
+		return *error_code_r == MAIL_ERROR_TEMP ? -1 : 0;
+	}
+
+	/* verify UIDVALIDITY */
+	mailbox_get_open_status(box, STATUS_UIDVALIDITY, &box_status);
+	if (mpurl->uidvalidity > 0 &&
+	    box_status.uidvalidity != mpurl->uidvalidity) {
+		*client_error_r = "Invalid UIDVALIDITY";
+		*error_code_r = MAIL_ERROR_EXPUNGED;
+		if (box != mpurl->selected_box)
+			mailbox_free(&box);
+		return 0;
+	}
+	mpurl->box = box;
+	*box_r = box;
+	return 1;
+}
+
+int imap_msgpart_url_open_mail(struct imap_msgpart_url *mpurl,
+			       struct mail **mail_r,
+			       const char **client_error_r)
+{
+	struct mailbox_transaction_context *t;
+	struct mailbox *box;
+	enum mail_error error_code;
+	struct mail *mail;
+	int ret;
+
+	if (mpurl->mail != NULL) {
+		*mail_r = mpurl->mail;
+		return 1;
+	}
+
+	/* open mailbox if it is not yet open */
+	if ((ret = imap_msgpart_url_open_mailbox(mpurl, &box, &error_code,
+						 client_error_r)) <= 0)
+		return ret;
+
+	/* start transaction */
+	t = mailbox_transaction_begin(box, 0, __func__);
+	mail = mail_alloc(t, MAIL_FETCH_MESSAGE_PARTS |
+			  MAIL_FETCH_IMAP_BODYSTRUCTURE, NULL);
+
+	/* find the message */
+	if (!mail_set_uid(mail, mpurl->uid)) {
+		*client_error_r = "Message not found";
+		mail_free(&mail);
+		mailbox_transaction_rollback(&t);	
+		return 0;
+	}
+
+	mpurl->trans = t;
+	mpurl->mail = mail;
+	*mail_r = mail;
+	return 1;
+}
+
+struct imap_msgpart *
+imap_msgpart_url_get_part(struct imap_msgpart_url *mpurl)
+{
+	return mpurl->part;
+}
+
+void imap_msgpart_url_set_decode_to_binary(struct imap_msgpart_url *mpurl)
+{
+	imap_msgpart_set_decode_to_binary(mpurl->part);
+}
+
+int imap_msgpart_url_read_part(struct imap_msgpart_url *mpurl,
+			       struct imap_msgpart_open_result *result_r,
+			       const char **client_error_r)
+{
+	struct mail *mail;
+	int ret;
+
+	if (mpurl->result.input != NULL) {
+		i_stream_seek(mpurl->result.input, 0);
+		*result_r = mpurl->result;
+		return 1;
+	}
+
+	/* open mail if it is not yet open */
+	ret = imap_msgpart_url_open_mail(mpurl, &mail, client_error_r);
+	if (ret <= 0)
+		return ret;
+
+	/* open the referenced part as a stream */
+	ret = imap_msgpart_open(mail, mpurl->part, result_r);
+	if (ret < 0) {
+		*client_error_r = mailbox_get_last_error(mpurl->box, NULL);
+		return ret;
+	}
+
+	mpurl->result = *result_r;
+	return 1;
+}
+
+int imap_msgpart_url_verify(struct imap_msgpart_url *mpurl,
+			    const char **client_error_r)
+{
+	struct mail *mail;
+	int ret;
+
+	if (mpurl->result.input != NULL)
+		return 1;
+
+	/* open mail if it is not yet open */
+	ret = imap_msgpart_url_open_mail(mpurl, &mail, client_error_r);
+	return ret;
+}
+
+int imap_msgpart_url_get_bodypartstructure(struct imap_msgpart_url *mpurl,
+					   const char **bpstruct_r,
+					   const char **client_error_r)
+{
+	struct mail *mail;
+	int ret;
+
+	/* open mail if it is not yet open */
+	ret = imap_msgpart_url_open_mail(mpurl, &mail, client_error_r);
+	if (ret <= 0)
+		return ret;
+
+	ret = imap_msgpart_bodypartstructure(mail, mpurl->part, bpstruct_r);
+	if (ret < 0)
+		*client_error_r = mailbox_get_last_error(mpurl->box, NULL);
+	else if (ret == 0)
+		*client_error_r = "Message part not found";
+	return ret;
+}
+
+void imap_msgpart_url_free(struct imap_msgpart_url **_mpurl)
+{
+	struct imap_msgpart_url *mpurl = *_mpurl;
+
+	*_mpurl = NULL;
+
+	i_stream_unref(&mpurl->result.input);
+	if (mpurl->part != NULL)
+		imap_msgpart_free(&mpurl->part);
+	if (mpurl->mail != NULL)
+		mail_free(&mpurl->mail);
+	if (mpurl->trans != NULL)
+		mailbox_transaction_rollback(&mpurl->trans);
+	if (mpurl->box != NULL && mpurl->box != mpurl->selected_box)
+		mailbox_free(&mpurl->box);	
+	if (mpurl->section != NULL)
+		i_free(mpurl->section);
+	i_free(mpurl->mailbox);
+	i_free(mpurl);
+}
diff --git a/src/lib-imap-storage/imap-msgpart-url.h b/src/lib-imap-storage/imap-msgpart-url.h
new file mode 100644
index 0000000..5bc72c2
--- /dev/null
+++ b/src/lib-imap-storage/imap-msgpart-url.h
@@ -0,0 +1,50 @@
+#ifndef IMAP_MSGPART_URL_H
+#define IMAP_MSGPART_URL_H
+
+#include "imap-msgpart.h"
+
+struct imap_url;
+struct imap_msgpart;
+struct imap_msgpart_url;
+
+/* Functions returning int return 1 on success, 0 if URL doesn't point to
+   valid mail, -1 on storage error. */
+
+int imap_msgpart_url_create(struct mail_user *user, const struct imap_url *url,
+			    struct imap_msgpart_url **url_r,
+			    const char **client_error_r);
+int imap_msgpart_url_parse(struct mail_user *user, struct mailbox *selected_box,
+			   const char *urlstr, struct imap_msgpart_url **url_r,
+			   const char **client_error_r);
+
+int imap_msgpart_url_open_mailbox(struct imap_msgpart_url *mpurl,
+				  struct mailbox **box_r, enum mail_error *error_code_r,
+				  const char **client_error_r);
+struct mailbox *imap_msgpart_url_get_mailbox(struct imap_msgpart_url *mpurl);
+int imap_msgpart_url_open_mail(struct imap_msgpart_url *mpurl,
+			       struct mail **mail_r,
+			       const char **client_error_r);
+
+struct imap_msgpart *
+imap_msgpart_url_get_part(struct imap_msgpart_url *mpurl);
+
+/* Decode MIME parts with Content-Transfer-Encoding: base64/quoted-printable
+   to binary data (IMAP BINARY extension). If something can't be decoded, fails
+   with storage error set to MAIL_ERROR_CONVERSION. */
+void imap_msgpart_url_set_decode_to_binary(struct imap_msgpart_url *mpurl);
+
+/* stream_r is set to NULL when part has zero length, e.g. when partial offset
+   is larger than the size of the referenced part */
+int imap_msgpart_url_read_part(struct imap_msgpart_url *mpurl,
+			       struct imap_msgpart_open_result *result_r,
+			       const char **client_error_r);
+
+int imap_msgpart_url_get_bodypartstructure(struct imap_msgpart_url *mpurl,
+					   const char **bpstruct_r,
+					   const char **client_error_r);
+
+int imap_msgpart_url_verify(struct imap_msgpart_url *mpurl,
+			    const char **client_error_r);
+void imap_msgpart_url_free(struct imap_msgpart_url **mpurl);
+
+#endif
diff --git a/src/lib-imap-storage/imap-msgpart.c b/src/lib-imap-storage/imap-msgpart.c
new file mode 100644
index 0000000..3bce117
--- /dev/null
+++ b/src/lib-imap-storage/imap-msgpart.c
@@ -0,0 +1,860 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "str.h"
+#include "array.h"
+#include "istream.h"
+#include "istream-crlf.h"
+#include "istream-nonuls.h"
+#include "istream-base64.h"
+#include "istream-header-filter.h"
+#include "istream-qp.h"
+#include "ostream.h"
+#include "message-parser.h"
+#include "message-decoder.h"
+#include "mail-storage-private.h"
+#include "mail-namespace.h"
+#include "imap-bodystructure.h"
+#include "imap-parser.h"
+#include "imap-msgpart.h"
+
+enum fetch_type {
+	FETCH_FULL,
+	FETCH_MIME,
+	FETCH_MIME_BODY,
+	FETCH_HEADER,
+	FETCH_HEADER_FIELDS,
+	FETCH_HEADER_FIELDS_NOT,
+	FETCH_BODY
+};
+
+struct imap_msgpart {
+	pool_t pool;
+
+	/* "" for root, otherwise e.g. "1.2.3". the .MIME, .HEADER, etc.
+	   suffix not included */
+	const char *section_number;
+	enum fetch_type fetch_type;
+	enum mail_fetch_field wanted_fields;
+
+	/* HEADER.FIELDS[.NOT] (list of headers) */
+        struct mailbox_header_lookup_ctx *header_ctx;
+	const char *const *headers;
+
+	/* which part of the message part to fetch (default: 0..UOFF_T_MAX) */
+	uoff_t partial_offset, partial_size;
+
+	bool decode_cte_to_binary:1;
+};
+
+struct imap_msgpart_open_ctx {
+	/* from matching message_part, set after opening: */
+	uoff_t physical_pos;
+	struct message_size mime_hdr_size;
+	struct message_size mime_body_size;
+};
+
+static struct imap_msgpart *imap_msgpart_type(enum fetch_type fetch_type)
+{
+	struct imap_msgpart *msgpart;
+	pool_t pool;
+
+	pool = pool_alloconly_create("imap msgpart", sizeof(*msgpart)+32);
+	msgpart = p_new(pool, struct imap_msgpart, 1);
+	msgpart->pool = pool;
+	msgpart->partial_size = UOFF_T_MAX;
+	msgpart->fetch_type = fetch_type;
+	msgpart->section_number = "";
+	if (fetch_type == FETCH_HEADER || fetch_type == FETCH_FULL)
+		msgpart->wanted_fields |= MAIL_FETCH_STREAM_HEADER;
+	if (fetch_type == FETCH_BODY || fetch_type == FETCH_FULL)
+		msgpart->wanted_fields |= MAIL_FETCH_STREAM_BODY;
+	return msgpart;
+}
+
+struct imap_msgpart *imap_msgpart_full(void)
+{
+	return imap_msgpart_type(FETCH_FULL);
+}
+
+struct imap_msgpart *imap_msgpart_header(void)
+{
+	return imap_msgpart_type(FETCH_HEADER);
+}
+
+struct imap_msgpart *imap_msgpart_body(void)
+{
+	return imap_msgpart_type(FETCH_BODY);
+}
+
+static struct message_part *
+imap_msgpart_find(struct message_part *parts, const char *section)
+{
+	struct message_part *part = parts;
+	const char *path;
+	unsigned int num;
+
+	path = section;
+	while (*path >= '0' && *path <= '9' && part != NULL) {
+		/* get part number, we have already verified its validity */
+		num = 0;
+		while (*path != '\0' && *path != '.') {
+			i_assert(*path >= '0' && *path <= '9');
+
+			num = num*10 + (*path - '0');
+			path++;
+		}
+
+		if (*path == '.')
+			path++;
+
+		if ((part->flags & MESSAGE_PART_FLAG_MULTIPART) != 0) {
+			/* find the part */
+			part = part->children;
+			for (; num > 1 && part != NULL; num--)
+				part = part->next;
+		} else {
+			/* only 1 allowed with non-multipart messages.
+			   if the child isn't message/rfc822, the path must be
+			   finished after this. */
+			if (num != 1)
+				part = NULL;
+			else if (*path != '\0' &&
+				 (part->flags & MESSAGE_PART_FLAG_MESSAGE_RFC822) == 0)
+				part = NULL;
+		}
+
+		if (part != NULL &&
+		    (part->flags & MESSAGE_PART_FLAG_MESSAGE_RFC822) != 0 &&
+		    (*path >= '0' && *path <= '9')) {
+			/* if we continue inside the message/rfc822, skip this
+			   body part */
+			part = part->children;
+		}
+	}
+	i_assert(part == NULL || *path == '\0');
+	return part;
+}
+
+static int
+imap_msgpart_get_header_fields(pool_t pool, const char *header_list,
+			       ARRAY_TYPE(const_string) *fields)
+{
+	struct istream *input;
+	struct imap_parser *parser;
+	const struct imap_arg *args, *hdr_list;
+	unsigned int list_count;
+	unsigned int i;
+	int result = 0;
+
+	input = i_stream_create_from_data(header_list, strlen(header_list));
+	parser = imap_parser_create(input, NULL, SIZE_MAX);
+
+	if (imap_parser_finish_line(parser, 0, 0, &args) > 0 &&
+	    imap_arg_get_list_full(args, &hdr_list, &list_count) &&
+	    args[1].type == IMAP_ARG_EOL &&
+	    list_count > 0) {
+		const char *value;
+		
+		p_array_init(fields, pool, list_count);
+		for (i = 0; i < list_count; i++) {
+			if (!imap_arg_get_astring(&hdr_list[i], &value)) {
+				result = -1;
+				break;
+			}
+
+			value = p_strdup(pool, t_str_ucase(value));
+			array_push_back(fields, &value);
+		}
+		/* istream-header-filter requires headers to be sorted */
+		array_sort(fields, i_strcasecmp_p);
+	} else {
+		result = -1;
+	}
+
+	imap_parser_unref(&parser);
+	i_stream_unref(&input);
+	return result;
+}
+
+static int
+imap_msgpart_parse_header_fields(struct imap_msgpart *msgpart,
+				 const char *header_list)
+{
+	ARRAY_TYPE(const_string) fields;
+
+	if (header_list[0] == ' ')
+		header_list++;
+
+	/* HEADER.FIELDS (list), HEADER.FIELDS.NOT (list) */
+	if (imap_msgpart_get_header_fields(msgpart->pool, header_list,
+					   &fields) < 0)
+		return -1;
+
+	array_append_zero(&fields);
+	msgpart->headers = array_front(&fields);
+	return 0;
+}
+
+int imap_msgpart_parse(const char *section, struct imap_msgpart **msgpart_r)
+{
+	struct imap_msgpart *msgpart;
+	pool_t pool;
+	unsigned int i;
+	bool next_digit;
+	int ret;
+
+	pool = pool_alloconly_create("imap msgpart", 1024);
+	msgpart = *msgpart_r = p_new(pool, struct imap_msgpart, 1);
+	msgpart->pool = pool;
+	msgpart->partial_size = UOFF_T_MAX;
+
+	/* get the section number */
+	next_digit = TRUE;
+	for (i = 0; section[i] != '\0'; i++) {
+		if (section[i] >= '0' && section[i] <= '9') {
+			next_digit = FALSE;
+		} else if (!next_digit && section[i] == '.') {
+			next_digit = TRUE;
+		} else {
+			break;
+		}
+	}
+	if (i == 0) {
+		/* [], [HEADER], etc. */
+		msgpart->section_number = "";
+	} else if (section[i] == '\0') {
+		/* [1.2.3] */
+		if (i > 0 && section[i-1] == '.') {
+			pool_unref(&pool);
+			return -1;
+		}
+		msgpart->section_number = p_strdup(pool, section);
+		section = "";
+	} else {
+		/* [1.2.3.MIME], [1.2.3.HEADER], etc */
+		if (section[i-1] != '.') {
+			pool_unref(&pool);
+			return -1;
+		}
+		msgpart->section_number = p_strndup(pool, section, i-1);
+		section += i;
+	}
+
+	if (*section == '\0') {
+		msgpart->wanted_fields |= MAIL_FETCH_STREAM_BODY;
+		if (*msgpart->section_number == '\0') {
+			/* BODY[] - header+body */
+			msgpart->fetch_type = FETCH_FULL;
+			msgpart->wanted_fields |= MAIL_FETCH_STREAM_HEADER;
+		} else {
+			/* BODY[1] - body only */
+			msgpart->fetch_type = FETCH_MIME_BODY;
+		}
+		return 0;
+	}
+	section = t_str_ucase(section);
+
+	if (strcmp(section, "MIME") == 0) {
+		if (msgpart->section_number[0] == '\0')
+			return -1;
+		msgpart->fetch_type = FETCH_MIME;
+		msgpart->wanted_fields |= MAIL_FETCH_STREAM_BODY;
+	} else if (strcmp(section, "TEXT") == 0) {
+		/* body (for root or for message/rfc822) */
+		msgpart->fetch_type = FETCH_BODY;
+		msgpart->wanted_fields |= MAIL_FETCH_STREAM_BODY;
+	} else if (str_begins(section, "HEADER")) {
+		/* header (for root or for message/rfc822) */
+		if (section[6] == '\0') {
+			msgpart->fetch_type = FETCH_HEADER;
+			ret = 0;
+		} else if (str_begins(section, "HEADER.FIELDS.NOT")) {
+			msgpart->fetch_type = FETCH_HEADER_FIELDS_NOT;
+			ret = imap_msgpart_parse_header_fields(msgpart,
+							       section+17);
+		} else if (str_begins(section, "HEADER.FIELDS")) {
+			msgpart->fetch_type = FETCH_HEADER_FIELDS;
+			ret = imap_msgpart_parse_header_fields(msgpart,
+							       section+13);
+		} else {
+			ret = -1;
+		}
+		if (ret < 0) {
+			imap_msgpart_free(&msgpart);
+			return -1;
+		}
+		if (msgpart->fetch_type == FETCH_HEADER_FIELDS) {
+			/* we may be able to get this from cache, don't give a
+			   wanted_fields hint */
+		} else if (*msgpart->section_number == '\0')
+			msgpart->wanted_fields |= MAIL_FETCH_STREAM_HEADER;
+		else
+			msgpart->wanted_fields |= MAIL_FETCH_STREAM_BODY;
+	} else {
+		imap_msgpart_free(&msgpart);
+		return -1;
+	}
+	return 0;
+}
+
+void imap_msgpart_free(struct imap_msgpart **_msgpart)
+{
+	struct imap_msgpart *msgpart = *_msgpart;
+
+	*_msgpart = NULL;
+
+	imap_msgpart_close_mailbox(msgpart);
+	pool_unref(&msgpart->pool);
+}
+
+bool imap_msgpart_contains_body(const struct imap_msgpart *msgpart)
+{
+	switch (msgpart->fetch_type) {
+	case FETCH_HEADER:
+	case FETCH_HEADER_FIELDS:
+	case FETCH_HEADER_FIELDS_NOT:
+		return FALSE;
+	case FETCH_FULL:
+	case FETCH_MIME:
+	case FETCH_MIME_BODY:
+	case FETCH_BODY:
+		break;
+	}
+	return TRUE;
+}
+
+void imap_msgpart_set_decode_to_binary(struct imap_msgpart *msgpart)
+{
+	msgpart->decode_cte_to_binary = TRUE;
+}
+
+void imap_msgpart_set_partial(struct imap_msgpart *msgpart,
+			      uoff_t offset, uoff_t size)
+{
+	msgpart->partial_offset = offset;
+	msgpart->partial_size = size;
+}
+
+uoff_t imap_msgpart_get_partial_offset(struct imap_msgpart *msgpart)
+{
+	return msgpart->partial_offset;
+}
+
+uoff_t imap_msgpart_get_partial_size(struct imap_msgpart *msgpart)
+{
+	return msgpart->partial_size;
+}
+
+enum mail_fetch_field imap_msgpart_get_fetch_data(struct imap_msgpart *msgpart)
+{
+	return msgpart->wanted_fields;
+}
+
+void imap_msgpart_get_wanted_headers(struct imap_msgpart *msgpart,
+				     ARRAY_TYPE(const_string) *headers)
+{
+	unsigned int i;
+
+	if (msgpart->fetch_type != FETCH_HEADER_FIELDS)
+		return;
+
+	for (i = 0; msgpart->headers[i] != NULL; i++)
+		array_push_back(headers, &msgpart->headers[i]);
+}
+
+static int
+imap_msgpart_get_partial_header(struct mail *mail, struct istream *mail_input,
+				const struct imap_msgpart *msgpart,
+				uoff_t *virtual_size_r, bool *have_crlfs_r,
+				struct imap_msgpart_open_result *result_r)
+{
+	const char *const *hdr_fields = msgpart->headers;
+	unsigned int hdr_count = str_array_length(hdr_fields);
+	struct message_size hdr_size;
+	struct istream *input;
+	bool has_nuls;
+
+	if (msgpart->fetch_type != FETCH_HEADER_FIELDS) {
+		i_assert(msgpart->fetch_type == FETCH_HEADER_FIELDS_NOT);
+		input = i_stream_create_header_filter(mail_input,
+						      HEADER_FILTER_EXCLUDE |
+						      HEADER_FILTER_HIDE_BODY,
+						      hdr_fields, hdr_count,
+						      *null_header_filter_callback,
+						      NULL);
+	} else if (msgpart->section_number[0] != '\0') {
+		/* fetching partial headers for a message/rfc822 part. */
+		input = i_stream_create_header_filter(mail_input,
+						      HEADER_FILTER_INCLUDE |
+						      HEADER_FILTER_HIDE_BODY,
+						      hdr_fields, hdr_count,
+						      *null_header_filter_callback,
+						      NULL);
+	} else {
+		/* mail_get_header_stream() already filtered out the
+		   unwanted headers. */
+		input = mail_input;
+		i_stream_ref(input);
+	}
+
+	if (message_get_header_size(input, &hdr_size, &has_nuls) < 0) {
+		mail_set_critical(mail,
+			"read(%s) failed: %s", i_stream_get_name(input),
+			i_stream_get_error(input));
+		i_stream_unref(&input);
+		return -1;
+	}
+	i_stream_seek(input, 0);
+	result_r->input = input;
+	result_r->size = hdr_size.virtual_size;
+	result_r->size_field = 0;
+	*virtual_size_r = hdr_size.virtual_size;
+	*have_crlfs_r = hdr_size.physical_size == hdr_size.virtual_size;
+	return 0;
+}
+
+static struct istream *
+imap_msgpart_crlf_seek(struct mail *mail, struct istream *input,
+		       const struct imap_msgpart *msgpart)
+{
+	struct mail_msgpart_partial_cache *cache = &mail->box->partial_cache;
+	struct istream *crlf_input, *errinput;
+	uoff_t physical_start = input->v_offset;
+	uoff_t virtual_skip = msgpart->partial_offset;
+	bool cr_skipped;
+
+	if (virtual_skip == 0) {
+		/* no need to seek */
+	} else if (mail->uid > 0 && cache->uid == mail->uid &&
+		   cache->physical_start == physical_start &&
+		   cache->virtual_pos < virtual_skip) {
+		/* use cache */
+		i_stream_seek(input, physical_start + cache->physical_pos);
+		virtual_skip -= cache->virtual_pos;
+	}
+	if (message_skip_virtual(input, virtual_skip, &cr_skipped) < 0) {
+		errinput = i_stream_create_error_str(errno, "%s", i_stream_get_error(input));
+		i_stream_set_name(errinput, i_stream_get_name(input));
+		i_stream_unref(&input);
+		return errinput;
+	}
+
+	if (mail->uid > 0 &&
+	    (msgpart->partial_offset != 0 ||
+	     msgpart->partial_size != UOFF_T_MAX) && !input->eof) {
+		/* update cache */
+		cache->uid = mail->uid;
+		cache->physical_start = physical_start;
+		cache->physical_pos = input->v_offset - physical_start;
+		cache->virtual_pos = msgpart->partial_offset;
+		if (cr_skipped) {
+			/* the physical_pos points to virtual CRLF, but
+			   virtual_pos already skipped CR. that can't work,
+			   so seek back the virtual CR */
+			cache->virtual_pos--;
+		}
+	}
+	crlf_input = i_stream_create_crlf(input);
+	if (cr_skipped)
+		i_stream_skip(crlf_input, 1);
+	i_stream_unref(&input);
+	return crlf_input;
+}
+
+static void
+imap_msgpart_get_partial(struct mail *mail, const struct imap_msgpart *msgpart,
+			 bool convert_nuls, bool use_partial_cache,
+			 uoff_t virtual_size, bool have_crlfs,
+			 struct imap_msgpart_open_result *result)
+{
+	struct istream *input2;
+	uoff_t bytes_left;
+
+	/* input is already seeked to the beginning of the wanted data */
+
+	if (msgpart->partial_offset >= virtual_size) {
+		/* can't seek past the MIME part */
+		i_stream_unref(&result->input);
+		result->input = i_stream_create_from_data("", 0);
+		result->size = 0;
+		return;
+	}
+
+	if (have_crlfs) {
+		/* input has CRLF linefeeds, we can quickly seek to
+		   wanted position */
+		i_stream_skip(result->input, msgpart->partial_offset);
+	} else {
+		/* input has LF linefeeds. it can be slow to seek to wanted
+		   position, so try to do caching whenever possible */
+		i_assert(use_partial_cache);
+		result->input = imap_msgpart_crlf_seek(mail, result->input,
+						       msgpart);
+	}
+
+	bytes_left = virtual_size - msgpart->partial_offset;
+	if (msgpart->partial_size <= bytes_left) {
+		/* limit output to specified number of bytes */
+		result->size = msgpart->partial_size;
+	} else {
+		/* send all bytes */
+		result->size = bytes_left;
+	}
+
+	if (!mail->has_no_nuls && convert_nuls) {
+		/* IMAP literals must not contain NULs. change them to
+		   0x80 characters. */
+		input2 = i_stream_create_nonuls(result->input, '\x80');
+		i_stream_unref(&result->input);
+		result->input = input2;
+	}
+	input2 = i_stream_create_limit(result->input, result->size);
+	i_stream_unref(&result->input);
+	result->input = input2;
+}
+
+static int
+imap_msgpart_find_part(struct mail *mail, const struct imap_msgpart *msgpart,
+		       struct message_part **part_r)
+{
+	struct message_part *parts, *part = NULL;
+
+	if (*msgpart->section_number == '\0') {
+		*part_r = NULL;
+		return 1;
+	}
+
+	if (mail_get_parts(mail, &parts) < 0)
+		return -1;
+	part = imap_msgpart_find(parts, msgpart->section_number);
+	if (part == NULL) {
+		/* MIME part not found. */
+		*part_r = NULL;
+		return 0;
+	}
+
+	switch (msgpart->fetch_type) {
+	case FETCH_MIME:
+		/* What to do if this is a message/rfc822? Does it have
+		   MIME headers or not? Possibilities are: a) no, return
+		   empty string (UW-IMAP does this), b) return the same as
+		   HEADER. Dovecot has done b) for a long time and it's not
+		   very clear which one is correct, so we'll just continue
+		   with b) */
+	case FETCH_FULL:
+	case FETCH_MIME_BODY:
+		break;
+	case FETCH_HEADER:
+	case FETCH_HEADER_FIELDS:
+	case FETCH_HEADER_FIELDS_NOT:
+	case FETCH_BODY:
+		/* fetching message/rfc822 part's header/body */
+		if ((part->flags & MESSAGE_PART_FLAG_MESSAGE_RFC822) == 0) {
+			*part_r = NULL;
+			return 0;
+		}
+		i_assert(part->children != NULL &&
+			 part->children->next == NULL);
+		part = part->children;
+		break;
+	}
+	*part_r = part;
+	return 1;
+}
+
+static int
+imap_msgpart_open_normal(struct mail *mail, struct imap_msgpart *msgpart,
+			 const struct message_part *part,
+			 uoff_t *virtual_size_r, bool *have_crlfs_r,
+			 struct imap_msgpart_open_result *result_r)
+{
+	struct message_size hdr_size, body_size, part_size;
+	struct istream *input = NULL;
+	bool unknown_crlfs = FALSE;
+
+	i_zero(&hdr_size);
+	i_zero(&body_size);
+	i_zero(&part_size);
+
+	if (*msgpart->section_number != '\0') {
+		/* find the MIME part */
+		i_assert(part != NULL);
+
+		if (mail_get_stream_because(mail, NULL, NULL, "MIME part", &input) < 0)
+			return -1;
+
+		i_stream_seek(input, part->physical_pos);
+		hdr_size = part->header_size;
+		body_size = part->body_size;
+	} else switch (msgpart->fetch_type) {
+	case FETCH_FULL:
+		/* fetch the whole message */
+		if (mail_get_stream_because(mail, NULL, NULL, "full mail", &input) < 0 ||
+		    mail_get_virtual_size(mail, &body_size.virtual_size) < 0)
+			return -1;
+		result_r->size_field = MAIL_FETCH_VIRTUAL_SIZE;
+
+		i_assert(mail->lookup_abort == MAIL_LOOKUP_ABORT_NEVER);
+		mail->lookup_abort = MAIL_LOOKUP_ABORT_READ_MAIL;
+		if (mail_get_physical_size(mail, &body_size.physical_size) < 0)
+			unknown_crlfs = TRUE;
+		mail->lookup_abort = MAIL_LOOKUP_ABORT_NEVER;
+		break;
+	case FETCH_MIME:
+	case FETCH_MIME_BODY:
+		i_unreached();
+	case FETCH_HEADER:
+	case FETCH_HEADER_FIELDS_NOT:
+		/* fetch the message's header */
+		if (mail_get_hdr_stream(mail, &hdr_size, &input) < 0)
+			return -1;
+		result_r->size_field = MAIL_FETCH_MESSAGE_PARTS;
+		break;
+	case FETCH_HEADER_FIELDS:
+		/* try to lookup the headers from cache */
+		if (msgpart->header_ctx == NULL) {
+			msgpart->header_ctx =
+				mailbox_header_lookup_init(mail->box,
+							   msgpart->headers);
+		}
+		if (mail_get_header_stream(mail, msgpart->header_ctx,
+					   &input) < 0)
+			return -1;
+		result_r->size_field = 0;
+		break;
+	case FETCH_BODY:
+		/* fetch the message's body */
+		if (mail_get_stream_because(mail, &hdr_size, &body_size,
+					    "mail body", &input) < 0)
+			return -1;
+		result_r->size_field = MAIL_FETCH_MESSAGE_PARTS;
+		break;
+	}
+
+	if (msgpart->headers != NULL) {
+		/* return specific headers */
+		return imap_msgpart_get_partial_header(mail, input, msgpart,
+						       virtual_size_r,
+						       have_crlfs_r, result_r);
+	}
+
+	switch (msgpart->fetch_type) {
+	case FETCH_FULL:
+		part_size.physical_size += body_size.physical_size;
+		part_size.virtual_size += body_size.virtual_size;
+		/* fall through */
+	case FETCH_MIME:
+	case FETCH_HEADER:
+		part_size.physical_size += hdr_size.physical_size;
+		part_size.virtual_size += hdr_size.virtual_size;
+		break;
+	case FETCH_HEADER_FIELDS:
+	case FETCH_HEADER_FIELDS_NOT:
+		i_unreached();
+	case FETCH_BODY:
+	case FETCH_MIME_BODY:
+		i_stream_skip(input, hdr_size.physical_size);
+		part_size.physical_size += body_size.physical_size;
+		part_size.virtual_size += body_size.virtual_size;
+		break;
+	}
+
+	result_r->input = input;
+	i_stream_ref(input);
+	*virtual_size_r = part_size.virtual_size;
+	*have_crlfs_r = !unknown_crlfs &&
+		part_size.virtual_size == part_size.physical_size;
+	return 0;
+}
+
+int imap_msgpart_open(struct mail *mail, struct imap_msgpart *msgpart,
+		      struct imap_msgpart_open_result *result_r)
+{
+	struct message_part *part;
+	uoff_t virtual_size;
+	bool include_hdr, binary, use_partial_cache, have_crlfs;
+	int ret;
+
+	i_zero(result_r);
+
+	if ((ret = imap_msgpart_find_part(mail, msgpart, &part)) < 0)
+		return -1;
+	if (ret == 0) {
+		/* MIME part not found. return an empty part. */
+		result_r->input = i_stream_create_from_data("", 0);
+		return 0;
+	}
+
+	if (msgpart->decode_cte_to_binary &&
+	    (msgpart->fetch_type == FETCH_FULL ||
+	     msgpart->fetch_type == FETCH_BODY ||
+	     msgpart->fetch_type == FETCH_MIME_BODY)) {
+		/* binary fetch */
+		include_hdr = msgpart->fetch_type == FETCH_FULL;
+		if (part == NULL) {
+			if (mail_get_parts(mail, &part) < 0)
+				return -1;
+		}
+		if (mail_get_binary_stream(mail, part, include_hdr,
+					   &virtual_size, &binary,
+					   &result_r->input) < 0)
+			return -1;
+		have_crlfs = TRUE;
+		use_partial_cache = FALSE;
+	} else {
+		if (imap_msgpart_open_normal(mail, msgpart, part, &virtual_size,
+					     &have_crlfs, result_r) < 0)
+			return -1;
+		binary = FALSE;
+		use_partial_cache = TRUE;
+	}
+
+	if (binary && msgpart->decode_cte_to_binary)
+		result_r->binary_decoded_input_has_nuls = TRUE;
+
+	imap_msgpart_get_partial(mail, msgpart, !binary, use_partial_cache,
+				 virtual_size, have_crlfs, result_r);
+	return 0;
+}
+
+int imap_msgpart_size(struct mail *mail, struct imap_msgpart *msgpart,
+		      uoff_t *size_r)
+{
+	struct imap_msgpart_open_result result;
+	struct message_part *part;
+	bool include_hdr;
+	unsigned int lines;
+	int ret;
+
+	if (!msgpart->decode_cte_to_binary ||
+	    (msgpart->fetch_type != FETCH_FULL &&
+	     msgpart->fetch_type != FETCH_BODY &&
+	     msgpart->fetch_type != FETCH_MIME_BODY)) {
+		/* generic implementation */
+		if (imap_msgpart_open(mail, msgpart, &result) < 0)
+			return -1;
+		i_stream_unref(&result.input);
+		*size_r = result.size;
+		return 0;
+	}
+
+	/* binary-optimized implementation: */
+	if ((ret = imap_msgpart_find_part(mail, msgpart, &part)) < 0)
+		return -1;
+	if (ret == 0) {
+		/* MIME part not found. return an empty part. */
+		*size_r = 0;
+		return 0;
+	}
+	if (part == NULL) {
+		if (mail_get_parts(mail, &part) < 0)
+			return -1;
+	}
+	include_hdr = msgpart->fetch_type == FETCH_FULL;
+	return mail_get_binary_size(mail, part, include_hdr, size_r, &lines);
+}
+
+static int
+imap_msgpart_parse_bodystructure(struct mail *mail,
+				 struct message_part *all_parts)
+{
+	struct mail_private *pmail = (struct mail_private *)mail;
+	const char *bodystructure, *error;
+
+	if (mail_get_special(mail, MAIL_FETCH_IMAP_BODYSTRUCTURE,
+			     &bodystructure) < 0)
+		return -1;
+	if (all_parts->context != NULL) {
+		/* we just parsed the bodystructure */
+		return 0;
+	}
+
+	if (imap_bodystructure_parse(bodystructure, pmail->data_pool,
+				     all_parts, &error) < 0) {
+		mail_set_cache_corrupted(mail,
+			MAIL_FETCH_IMAP_BODYSTRUCTURE, t_strdup_printf(
+			"Invalid message_part/BODYSTRUCTURE %s: %s",
+			bodystructure, error));
+		return -1;
+	}
+	return 0;
+}
+
+static int
+imap_msgpart_vsizes_to_binary(struct mail *mail, const struct message_part *part,
+			      struct message_part **binpart_r)
+{
+	struct message_part **pos;
+	uoff_t size;
+	unsigned int lines;
+
+	if (mail_get_binary_size(mail, part, FALSE, &size, &lines) < 0)
+		return -1;
+
+	*binpart_r = t_new(struct message_part, 1);
+	**binpart_r = *part;
+	(*binpart_r)->body_size.virtual_size = size;
+	(*binpart_r)->body_size.lines = lines;
+
+	pos = &(*binpart_r)->children;
+	for (part = part->children; part != NULL; part = part->next) {
+		if (imap_msgpart_vsizes_to_binary(mail, part, pos) < 0)
+			return -1;
+		pos = &(*pos)->next;
+	}
+	return 0;
+}
+
+int imap_msgpart_bodypartstructure(struct mail *mail,
+				   struct imap_msgpart *msgpart,
+				   const char **bpstruct_r)
+{
+	struct message_part *all_parts, *part;
+	string_t *bpstruct;
+	const char *error;
+	int ret;
+
+	/* if we start parsing the body in here, make sure we also parse the
+	   BODYSTRUCTURE */
+	mail_add_temp_wanted_fields(mail, MAIL_FETCH_IMAP_BODYSTRUCTURE, NULL);
+
+	if ((ret = imap_msgpart_find_part(mail, msgpart, &part)) < 0)
+		return -1;
+	if (ret == 0) {
+		/* MIME part not found. */
+		*bpstruct_r = NULL;
+		return 0;
+	}
+
+	if (mail_get_parts(mail, &all_parts) < 0)
+		return -1;
+	if (all_parts->context == NULL) {
+		if (imap_msgpart_parse_bodystructure(mail, all_parts) < 0)
+			return -1;
+	}
+	if (part == NULL)
+		part = all_parts;
+
+	if (msgpart->decode_cte_to_binary)
+		ret = imap_msgpart_vsizes_to_binary(mail, part, &part);
+
+	if (ret >= 0) {
+		bpstruct = t_str_new(256);
+		if (imap_bodystructure_write(part, bpstruct, TRUE, &error) < 0) {
+			error = t_strdup_printf(
+				"Invalid message_part/BODYSTRUCTURE: %s", error);
+			mail_set_cache_corrupted(mail, MAIL_FETCH_MESSAGE_PARTS,
+						 error);
+			return -1;
+		}
+		*bpstruct_r = str_c(bpstruct);
+	}
+	return ret < 0 ? -1 : 1;
+}
+
+
+void imap_msgpart_close_mailbox(struct imap_msgpart *msgpart)
+{
+	mailbox_header_lookup_unref(&msgpart->header_ctx);
+}
diff --git a/src/lib-imap-storage/imap-msgpart.h b/src/lib-imap-storage/imap-msgpart.h
new file mode 100644
index 0000000..92b56c6
--- /dev/null
+++ b/src/lib-imap-storage/imap-msgpart.h
@@ -0,0 +1,68 @@
+#ifndef IMAP_MSGPART_H
+#define IMAP_MSGPART_H
+
+struct imap_msgpart;
+
+struct imap_msgpart_open_result {
+	/* message contents with CRLF linefeeds */
+	struct istream *input;
+	/* size of input */
+	uoff_t size;
+	/* if size was looked up using cache and it ends up being wrong,
+	   this field can be used to log about cache corruption */
+	enum mail_fetch_field size_field;
+	/* TRUE if BINARY decoded content contains NUL characters */
+	bool binary_decoded_input_has_nuls;
+};
+
+struct imap_msgpart *imap_msgpart_full(void);
+struct imap_msgpart *imap_msgpart_header(void);
+struct imap_msgpart *imap_msgpart_body(void);
+/* Parse section into imap_msgpart. Returns 0 and msgpart_r on success,
+   -1 if the section isn't valid. The same imap_msgpart can be used to open
+   multiple messages. */
+int imap_msgpart_parse(const char *section, struct imap_msgpart **msgpart_r);
+void imap_msgpart_free(struct imap_msgpart **msgpart);
+
+/* Returns TRUE if the msgpart might return at least part of the message body.
+   Or alternatively: If FALSE is returned, the msgpart will never return
+   anything except (part of) the message header. MIME headers are counted
+   as part of the message body. */
+bool imap_msgpart_contains_body(const struct imap_msgpart *msgpart);
+/* Decode MIME parts with Content-Transfer-Encoding: base64/quoted-printable
+   to binary data (IMAP BINARY extension). If something can't be decoded, fails
+   with storage error set to MAIL_ERROR_CONVERSION. */
+void imap_msgpart_set_decode_to_binary(struct imap_msgpart *msgpart);
+
+/* Set the fetch to be partial. For unlimited size use UOFF_T_MAX. */
+void imap_msgpart_set_partial(struct imap_msgpart *msgpart,
+			      uoff_t offset, uoff_t size);
+uoff_t imap_msgpart_get_partial_offset(struct imap_msgpart *msgpart);
+uoff_t imap_msgpart_get_partial_size(struct imap_msgpart *msgpart);
+/* Return wanted_fields mask. */
+enum mail_fetch_field imap_msgpart_get_fetch_data(struct imap_msgpart *msgpart);
+/* Append all the specifically requested headers to the headers array
+   (no deduplication is done) */
+void imap_msgpart_get_wanted_headers(struct imap_msgpart *msgpart,
+				     ARRAY_TYPE(const_string) *headers);
+
+/* Open message part refenced by IMAP section as istream. Returns 0 if
+   successful, -1 if storage error. Returned istream is initially referenced,
+   so i_stream_unref() must be called for it. */
+int imap_msgpart_open(struct mail *mail, struct imap_msgpart *msgpart,
+		      struct imap_msgpart_open_result *result_r);
+/* Return msgpart's size without actually opening the stream (if possible). */
+int imap_msgpart_size(struct mail *mail, struct imap_msgpart *msgpart,
+		      uoff_t *size_r);
+
+/* Return msgpart's IMAP BODYPARTSTRUCTURE */
+int imap_msgpart_bodypartstructure(struct mail *mail,
+				   struct imap_msgpart *msgpart,
+				   const char **bpstruct_r);
+
+/* Header context is automatically created by imap_msgpart_open() and destroyed
+   by imap_msgpart_free(), but if you want to use the same imap_msgpart across
+   multiple mailboxes, you need to close the part before closing the mailbox. */
+void imap_msgpart_close_mailbox(struct imap_msgpart *msgpart);
+
+#endif
diff --git a/src/lib-imap-urlauth/Makefile.am b/src/lib-imap-urlauth/Makefile.am
new file mode 100644
index 0000000..6734b72
--- /dev/null
+++ b/src/lib-imap-urlauth/Makefile.am
@@ -0,0 +1,29 @@
+noinst_LTLIBRARIES = libimap-urlauth.la
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib \
+	-I$(top_srcdir)/src/lib-test \
+	-I$(top_srcdir)/src/lib-charset \
+	-I$(top_srcdir)/src/lib-dict \
+	-I$(top_srcdir)/src/lib-mail \
+	-I$(top_srcdir)/src/lib-index \
+	-I$(top_srcdir)/src/lib-storage \
+	-I$(top_srcdir)/src/lib-imap \
+	-I$(top_srcdir)/src/lib-imap-storage
+
+libimap_urlauth_la_SOURCES = \
+	imap-urlauth.c \
+	imap-urlauth-fetch.c \
+	imap-urlauth-backend.c \
+	imap-urlauth-connection.c
+
+headers = \
+	imap-urlauth.h \
+	imap-urlauth-private.h \
+	imap-urlauth-fetch.h \
+	imap-urlauth-backend.h \
+	imap-urlauth-connection.h
+
+pkginc_libdir=$(pkgincludedir)
+pkginc_lib_HEADERS = $(headers)
+
diff --git a/src/lib-imap-urlauth/Makefile.in b/src/lib-imap-urlauth/Makefile.in
new file mode 100644
index 0000000..3edb9bc
--- /dev/null
+++ b/src/lib-imap-urlauth/Makefile.in
@@ -0,0 +1,835 @@
+# Makefile.in generated by automake 1.16.1 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2018 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
+        -*I) strip_trailopt 'I'; skip_next=yes;; \
+      -*I?*) strip_trailopt 'I';; \
+        -*O) strip_trailopt 'O'; skip_next=yes;; \
+      -*O?*) strip_trailopt 'O';; \
+        -*l) strip_trailopt 'l'; skip_next=yes;; \
+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
+    esac; \
+  done; \
+  test $$has_opt = yes
+am__make_dryrun = (target_option=n; $(am__make_running_with_option))
+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
+pkgdatadir = $(datadir)/@PACKAGE@
+pkgincludedir = $(includedir)/@PACKAGE@
+pkglibdir = $(libdir)/@PACKAGE@
+pkglibexecdir = $(libexecdir)/@PACKAGE@
+am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
+install_sh_DATA = $(install_sh) -c -m 644
+install_sh_PROGRAM = $(install_sh) -c
+install_sh_SCRIPT = $(install_sh) -c
+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
+build_triplet = @build@
+host_triplet = @host@
+subdir = src/lib-imap-urlauth
+ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
+am__aclocal_m4_deps = $(top_srcdir)/m4/ac_checktype2.m4 \
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+	     $$unique
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+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
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+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
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+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
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+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
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+	    || cp -p $$d/$$file "$(distdir)/$$file" \
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
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+	-rm -f ./$(DEPDIR)/imap-urlauth-connection.Plo
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+	-rm -f ./$(DEPDIR)/imap-urlauth.Plo
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diff --git a/src/lib-imap-urlauth/imap-urlauth-backend.c b/src/lib-imap-urlauth/imap-urlauth-backend.c
new file mode 100644
index 0000000..de2b9c9
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth-backend.c
@@ -0,0 +1,174 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "buffer.h"
+#include "hex-binary.h"
+#include "randgen.h"
+#include "mail-user.h"
+#include "mail-storage.h"
+#include "mailbox-list-iter.h"
+#include "imap-urlauth-private.h"
+#include "imap-urlauth-backend.h"
+
+#define IMAP_URLAUTH_KEY MAILBOX_ATTRIBUTE_PREFIX_DOVECOT"imap-urlauth"
+
+static int
+imap_urlauth_backend_trans_set_mailbox_key(struct mailbox *box,
+					   unsigned char mailbox_key_r[IMAP_URLAUTH_KEY_LEN],
+					   const char **client_error_r,
+					   enum mail_error *error_code_r)
+{
+	struct mail_attribute_value urlauth_key;
+	const char *mailbox_key_hex = NULL;
+	int ret;
+
+	if (mailbox_open(box) < 0) {
+		*client_error_r = mailbox_get_last_error(box, error_code_r);
+		return -1;
+	}
+
+	struct mailbox_transaction_context *t =
+		mailbox_transaction_begin(box,
+				MAILBOX_TRANSACTION_FLAG_EXTERNAL,
+				__func__);
+
+	/* create new key */
+	random_fill(mailbox_key_r, IMAP_URLAUTH_KEY_LEN);
+	mailbox_key_hex = binary_to_hex(mailbox_key_r,
+					IMAP_URLAUTH_KEY_LEN);
+	i_zero(&urlauth_key);
+	urlauth_key.value = mailbox_key_hex;
+	ret = mailbox_attribute_set(t, MAIL_ATTRIBUTE_TYPE_PRIVATE,
+				    IMAP_URLAUTH_KEY, &urlauth_key);
+
+	if (mailbox_transaction_commit(&t) < 0) {
+		*client_error_r = mailbox_get_last_error(box, error_code_r);
+		ret = -1;
+	}
+
+	return ret;
+}
+
+static int
+imap_urlauth_backend_trans_get_mailbox_key(struct mailbox *box,
+					   bool create,
+					   unsigned char mailbox_key_r[IMAP_URLAUTH_KEY_LEN],
+					   const char **client_error_r,
+					   enum mail_error *error_code_r)
+{
+	struct mail_user *user = mail_storage_get_user(mailbox_get_storage(box));
+	struct mail_attribute_value urlauth_key;
+	const char *mailbox_key_hex = NULL;
+	buffer_t key_buf;
+	int ret;
+
+	*client_error_r = "Internal server error";
+	*error_code_r = MAIL_ERROR_TEMP;
+
+	ret = mailbox_attribute_get(box, MAIL_ATTRIBUTE_TYPE_PRIVATE,
+				    IMAP_URLAUTH_KEY, &urlauth_key);
+	if (ret < 0)
+		return -1;
+
+	e_debug(user->event, "imap-urlauth: %skey found for mailbox %s",
+		(ret > 0 ? "" : "no "), mailbox_get_vname(box));
+
+	if (ret == 0) {
+		if (!create)
+			return 0;
+
+		ret = imap_urlauth_backend_trans_set_mailbox_key(box,
+								 mailbox_key_r,
+								 client_error_r,
+								 error_code_r);
+
+		if (ret < 0)
+			return -1;
+		e_debug(user->event, "imap-urlauth: created key for mailbox %s",
+			mailbox_get_vname(box));
+	} else {
+		/* read existing key */
+		buffer_create_from_data(&key_buf, mailbox_key_r,
+					IMAP_URLAUTH_KEY_LEN);
+		mailbox_key_hex = urlauth_key.value;
+		if (strlen(mailbox_key_hex) != 2*IMAP_URLAUTH_KEY_LEN ||
+		    hex_to_binary(mailbox_key_hex, &key_buf) < 0 ||
+		    key_buf.used != IMAP_URLAUTH_KEY_LEN) {
+			i_error("imap-urlauth: key found for mailbox %s is invalid",
+				mailbox_get_vname(box));
+			return -1;
+		}
+	}
+	return 1;
+}
+
+int imap_urlauth_backend_get_mailbox_key(struct mailbox *box, bool create,
+					 unsigned char mailbox_key_r[IMAP_URLAUTH_KEY_LEN],
+					 const char **client_error_r,
+					 enum mail_error *error_code_r)
+{
+	int ret;
+
+	ret = imap_urlauth_backend_trans_get_mailbox_key(box, create,
+							 mailbox_key_r,
+							 client_error_r,
+							 error_code_r);
+	return ret;
+}
+
+int imap_urlauth_backend_reset_mailbox_key(struct mailbox *box)
+{
+	struct mailbox_transaction_context *t;
+	int ret;
+
+	t = mailbox_transaction_begin(box, MAILBOX_TRANSACTION_FLAG_EXTERNAL,
+				      __func__);
+	ret = mailbox_attribute_unset(t, MAIL_ATTRIBUTE_TYPE_PRIVATE,
+				      IMAP_URLAUTH_KEY);
+	if (mailbox_transaction_commit(&t) < 0)
+		ret = -1;
+	return ret;
+}
+
+static int imap_urlauth_backend_mailbox_reset_key(struct mailbox *box)
+{
+	const char *errstr;
+	enum mail_error error;
+
+	if (mailbox_open(box) < 0) {
+		errstr = mailbox_get_last_internal_error(box, &error);
+		if (error == MAIL_ERROR_NOTFOUND || error == MAIL_ERROR_PERM)
+			return 0;
+		i_error("urlauth key reset: Couldn't open mailbox %s: %s",
+			mailbox_get_vname(box), errstr);
+		return -1;
+	}
+	return imap_urlauth_backend_reset_mailbox_key(box);
+}
+
+int imap_urlauth_backend_reset_all_keys(struct mail_user *user)
+{ 
+	const char *const patterns[] = { "*", NULL };
+	struct mailbox_list_iterate_context *iter;
+	const struct mailbox_info *info;
+	struct mailbox *box;
+	int ret = 0;
+
+	iter = mailbox_list_iter_init_namespaces(user->namespaces, patterns,
+						 MAIL_NAMESPACE_TYPE_MASK_ALL,
+						 MAILBOX_LIST_ITER_NO_AUTO_BOXES |
+						 MAILBOX_LIST_ITER_SKIP_ALIASES |
+						 MAILBOX_LIST_ITER_RETURN_NO_FLAGS);
+	while ((info = mailbox_list_iter_next(iter)) != NULL) {
+		box = mailbox_alloc(info->ns->list, info->vname, 0);
+		if (imap_urlauth_backend_mailbox_reset_key(box) < 0)
+			ret = -1;
+		mailbox_free(&box);
+	}
+	if (mailbox_list_iter_deinit(&iter) < 0) {
+		i_error("urlauth key reset: Couldn't iterate mailboxes: %s",
+			mailbox_list_get_last_internal_error(user->namespaces->list, NULL));
+		ret = -1;
+	}
+	return ret;
+}
diff --git a/src/lib-imap-urlauth/imap-urlauth-backend.h b/src/lib-imap-urlauth/imap-urlauth-backend.h
new file mode 100644
index 0000000..b76ecc5
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth-backend.h
@@ -0,0 +1,16 @@
+#ifndef IMAP_URLAUTH_BACKEND_H
+#define IMAP_URLAUTH_BACKEND_H
+
+#define IMAP_URLAUTH_KEY_LEN 64
+
+struct imap_urlauth_backend;
+
+int imap_urlauth_backend_get_mailbox_key(struct mailbox *box, bool create,
+					 unsigned char mailbox_key_r[IMAP_URLAUTH_KEY_LEN],
+					 const char **client_error_r,
+					 enum mail_error *error_code_r);
+int imap_urlauth_backend_reset_mailbox_key(struct mailbox *box);
+int imap_urlauth_backend_reset_all_keys(struct mail_user *user);
+
+#endif
+
diff --git a/src/lib-imap-urlauth/imap-urlauth-connection.c b/src/lib-imap-urlauth/imap-urlauth-connection.c
new file mode 100644
index 0000000..5fce6f7
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth-connection.c
@@ -0,0 +1,1027 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "llist.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "strescape.h"
+#include "ioloop.h"
+#include "safe-mkstemp.h"
+#include "hostpid.h"
+#include "net.h"
+#include "istream.h"
+#include "ostream.h"
+#include "write-full.h"
+#include "array.h"
+#include "aqueue.h"
+#include "mail-user.h"
+#include "imap-urlauth-fetch.h"
+
+#include "imap-urlauth-connection.h"
+
+enum imap_urlauth_state {
+	IMAP_URLAUTH_STATE_DISCONNECTED = 0,
+	IMAP_URLAUTH_STATE_AUTHENTICATING,
+	IMAP_URLAUTH_STATE_AUTHENTICATED,
+	IMAP_URLAUTH_STATE_SELECTING_TARGET,
+	IMAP_URLAUTH_STATE_UNSELECTING_TARGET,
+	IMAP_URLAUTH_STATE_READY,
+	IMAP_URLAUTH_STATE_REQUEST_PENDING,
+	IMAP_URLAUTH_STATE_REQUEST_WAIT,
+};
+
+struct imap_urlauth_request {
+	struct imap_urlauth_target *target;
+	struct imap_urlauth_request *prev, *next;
+	
+	char *url;
+	enum imap_urlauth_fetch_flags flags;
+
+	char *bodypartstruct;
+
+	imap_urlauth_request_callback_t *callback;
+	void *context;
+
+	bool binary_has_nuls;
+};
+
+struct imap_urlauth_target {
+	struct imap_urlauth_target *prev, *next;
+
+	char *userid;
+
+	struct imap_urlauth_request *requests_head, *requests_tail;
+};
+
+struct imap_urlauth_connection {
+	int refcount;
+
+	char *path, *service, *session_id;
+	struct mail_user *user;
+
+	int fd;
+	struct istream *input;
+	struct ostream *output;
+	struct io *io;
+
+	struct timeout *to_reconnect, *to_idle, *to_response;
+	time_t last_reconnect;
+	unsigned int reconnect_attempts;
+	unsigned int idle_timeout_msecs;
+
+	char *literal_temp_path;
+	int literal_fd;
+	buffer_t *literal_buf;
+	uoff_t literal_size, literal_bytes_left;
+
+	enum imap_urlauth_state state;
+
+	/* userid => target struct */
+	struct imap_urlauth_target *targets_head, *targets_tail;
+
+	bool reading_literal:1;
+};
+
+#define IMAP_URLAUTH_RECONNECT_MIN_SECS 2
+#define IMAP_URLAUTH_RECONNECT_MAX_ATTEMPTS 3
+
+#define IMAP_URLAUTH_RESPONSE_TIMEOUT_MSECS 2*60*1000
+
+#define IMAP_URLAUTH_HANDSHAKE "VERSION\timap-urlauth\t2\t0\n"
+
+#define IMAP_URLAUTH_MAX_INLINE_LITERAL_SIZE (1024*32)
+
+static void imap_urlauth_connection_disconnect
+	(struct imap_urlauth_connection *conn, const char *reason);
+static void imap_urlauth_connection_abort
+	(struct imap_urlauth_connection *conn, const char *reason);
+static void imap_urlauth_connection_reconnect
+	(struct imap_urlauth_connection *conn);
+static void imap_urlauth_connection_idle_disconnect
+	(struct imap_urlauth_connection *conn);
+static void imap_urlauth_connection_timeout_abort
+	(struct imap_urlauth_connection *conn);
+static void imap_urlauth_connection_fail
+	(struct imap_urlauth_connection *conn);
+
+struct imap_urlauth_connection *
+imap_urlauth_connection_init(const char *path, const char *service,
+			     struct mail_user *user, const char *session_id,
+			     unsigned int idle_timeout_msecs)
+{
+	struct imap_urlauth_connection *conn;
+
+	conn = i_new(struct imap_urlauth_connection, 1);
+	conn->refcount = 1;
+	conn->service = i_strdup(service);
+	conn->path = i_strdup(path);
+	if (session_id != NULL)
+		conn->session_id = i_strdup(session_id);
+	conn->user = user;
+	conn->fd = -1;
+	conn->literal_fd = -1;
+	conn->idle_timeout_msecs = idle_timeout_msecs;
+	return conn;
+}
+
+void imap_urlauth_connection_deinit(struct imap_urlauth_connection **_conn)
+{
+	struct imap_urlauth_connection *conn = *_conn;
+
+	*_conn = NULL;
+
+	imap_urlauth_connection_abort(conn, NULL);
+
+	i_free(conn->path);
+	i_free(conn->service);
+	if (conn->session_id != NULL)
+		i_free(conn->session_id);
+
+	i_assert(conn->to_idle == NULL);
+	i_assert(conn->to_reconnect == NULL);
+	i_assert(conn->to_response == NULL);
+
+	i_free(conn);
+}
+
+static void
+imap_urlauth_stop_response_timeout(struct imap_urlauth_connection *conn)
+{
+	timeout_remove(&conn->to_response);
+}
+
+static void
+imap_urlauth_start_response_timeout(struct imap_urlauth_connection *conn)
+{
+	imap_urlauth_stop_response_timeout(conn);
+	conn->to_response = timeout_add(IMAP_URLAUTH_RESPONSE_TIMEOUT_MSECS,
+		imap_urlauth_connection_timeout_abort, conn);
+}
+
+static struct imap_urlauth_target *
+imap_urlauth_connection_get_target(struct imap_urlauth_connection *conn,
+				   const char *target_user)
+{
+	struct imap_urlauth_target *target = conn->targets_head;
+
+	while (target != NULL) {
+		if (strcmp(target->userid, target_user) == 0)
+			return target;
+		target = target->next;
+	}
+
+	target = i_new(struct imap_urlauth_target, 1);
+	target->userid = i_strdup(target_user);
+	DLLIST2_APPEND(&conn->targets_head, &conn->targets_tail, target);
+	return target;
+}
+
+static void
+imap_urlauth_target_free(struct imap_urlauth_connection *conn,
+			 struct imap_urlauth_target *target)
+{
+	DLLIST2_REMOVE(&conn->targets_head, &conn->targets_tail, target);
+	i_free(target->userid);
+	i_free(target);
+}
+
+static void
+imap_urlauth_connection_select_target(struct imap_urlauth_connection *conn)
+{
+	struct imap_urlauth_target *target = conn->targets_head;
+	const char *cmd;
+
+	if (target == NULL || conn->state != IMAP_URLAUTH_STATE_AUTHENTICATED)
+		return;
+
+	e_debug(conn->user->event,
+		"imap-urlauth: Selecting target user `%s'", target->userid);
+
+	conn->state = IMAP_URLAUTH_STATE_SELECTING_TARGET;
+	cmd = t_strdup_printf("USER\t%s\n", str_tabescape(target->userid));
+	if (o_stream_send_str(conn->output, cmd) < 0) {
+		i_warning("Error sending USER request to imap-urlauth server: %m");
+		imap_urlauth_connection_fail(conn);
+	}
+
+	imap_urlauth_start_response_timeout(conn);
+}
+
+static void
+imap_urlauth_connection_send_request(struct imap_urlauth_connection *conn)
+{
+	struct imap_urlauth_request *urlreq;
+	string_t *cmd;
+
+	if (conn->targets_head == NULL ||
+	    (conn->targets_head->requests_head == NULL &&
+	     conn->targets_head->next == NULL &&
+	     conn->state == IMAP_URLAUTH_STATE_READY)) {
+		e_debug(conn->user->event,
+			"imap-urlauth: No more requests pending; scheduling disconnect");
+		timeout_remove(&conn->to_idle);
+		if (conn->idle_timeout_msecs > 0) {
+			conn->to_idle =	timeout_add(conn->idle_timeout_msecs,
+				imap_urlauth_connection_idle_disconnect, conn);
+		}
+		return;
+	}
+
+	if (conn->state == IMAP_URLAUTH_STATE_AUTHENTICATED) {
+		imap_urlauth_connection_select_target(conn);
+		return;
+	}
+
+	if (conn->state != IMAP_URLAUTH_STATE_READY)
+		return;
+
+	urlreq = conn->targets_head->requests_head;
+	if (urlreq == NULL) {
+		if (conn->targets_head->next == NULL)
+			return;
+		
+		conn->state = IMAP_URLAUTH_STATE_UNSELECTING_TARGET;
+		imap_urlauth_target_free(conn, conn->targets_head);
+
+		if (o_stream_send_str(conn->output, "END\n") < 0) {
+			i_warning("Error sending END request to imap-urlauth server: %m");
+			imap_urlauth_connection_fail(conn);
+		}
+		imap_urlauth_start_response_timeout(conn);
+		return;
+	}	
+
+	e_debug(conn->user->event,
+		"imap-urlauth: Fetching URL `%s'", urlreq->url);
+
+	cmd = t_str_new(128);
+	str_append(cmd, "URL\t");
+	str_append_tabescaped(cmd, urlreq->url);
+	if ((urlreq->flags & IMAP_URLAUTH_FETCH_FLAG_BODYPARTSTRUCTURE) != 0)
+		str_append(cmd, "\tbpstruct");
+	if ((urlreq->flags & IMAP_URLAUTH_FETCH_FLAG_BINARY) != 0)
+		str_append(cmd, "\tbinary");
+	else if ((urlreq->flags & IMAP_URLAUTH_FETCH_FLAG_BODY) != 0)
+		str_append(cmd, "\tbody");
+	str_append_c(cmd, '\n');
+
+	conn->state = IMAP_URLAUTH_STATE_REQUEST_PENDING;
+	if (o_stream_send(conn->output, str_data(cmd), str_len(cmd)) < 0) {
+		i_warning("Error sending URL request to imap-urlauth server: %m");
+		imap_urlauth_connection_fail(conn);
+	}
+
+	imap_urlauth_start_response_timeout(conn);
+}
+
+struct imap_urlauth_request *
+imap_urlauth_request_new(struct imap_urlauth_connection *conn,
+			 const char *target_user, const char *url,
+			 enum imap_urlauth_fetch_flags flags,
+			 imap_urlauth_request_callback_t *callback,
+			 void *context)
+{
+	struct imap_urlauth_request *urlreq;
+	struct imap_urlauth_target *target;
+
+	target = imap_urlauth_connection_get_target(conn, target_user);
+	
+	urlreq = i_new(struct imap_urlauth_request, 1);
+	urlreq->url = i_strdup(url);
+	urlreq->flags = flags;
+	urlreq->target = target;
+	urlreq->callback = callback;
+	urlreq->context = context;
+
+	DLLIST2_APPEND(&target->requests_head, &target->requests_tail, urlreq);
+
+	timeout_remove(&conn->to_idle);
+	
+	e_debug(conn->user->event,
+		"imap-urlauth: Added request for URL `%s' from user `%s'",
+		url, target_user);
+
+	imap_urlauth_connection_send_request(conn);
+	return urlreq;
+}
+
+static void imap_urlauth_request_free(struct imap_urlauth_request *urlreq)
+{
+	struct imap_urlauth_target *target = urlreq->target;
+
+	DLLIST2_REMOVE(&target->requests_head, &target->requests_tail, urlreq);
+	i_free(urlreq->url);
+	i_free(urlreq->bodypartstruct);
+	i_free(urlreq);
+}
+
+static void imap_urlauth_request_drop(struct imap_urlauth_connection *conn,
+				struct imap_urlauth_request *urlreq)
+{
+	if ((conn->state == IMAP_URLAUTH_STATE_REQUEST_PENDING ||
+			conn->state == IMAP_URLAUTH_STATE_REQUEST_WAIT) &&
+	    conn->targets_head != NULL &&
+	    conn->targets_head->requests_head == urlreq) {
+		/* cannot just drop pending request without breaking
+		   protocol state */
+		return;
+	}
+	imap_urlauth_request_free(urlreq);
+
+}
+
+void imap_urlauth_request_abort(struct imap_urlauth_connection *conn,
+				struct imap_urlauth_request *urlreq)
+{
+	imap_urlauth_request_callback_t *callback;
+
+	callback = urlreq->callback;
+	urlreq->callback = NULL;
+	if (callback != NULL) {
+		T_BEGIN {
+			callback(NULL, urlreq->context);
+		} T_END;
+	}
+
+	imap_urlauth_request_drop(conn, urlreq);
+}
+
+static void
+imap_urlauth_request_fail(struct imap_urlauth_connection *conn,
+			  struct imap_urlauth_request *urlreq,
+			  const char *error)
+{
+	struct imap_urlauth_fetch_reply reply;
+	imap_urlauth_request_callback_t *callback;
+	int ret = 1;
+
+	callback = urlreq->callback;
+	urlreq->callback = NULL;
+	if (callback != NULL) {
+		i_zero(&reply);
+		reply.url = urlreq->url;
+		reply.flags = urlreq->flags;
+		reply.succeeded = FALSE;
+		reply.error = error;
+
+		T_BEGIN {
+			ret = callback(&reply, urlreq->context);
+		} T_END;
+	}
+
+	void *urlreq_context = urlreq->context;
+	imap_urlauth_request_drop(conn, urlreq);
+
+	if (ret < 0) {
+		/* Drop any related requests upon error */
+		imap_urlauth_request_abort_by_context(conn, urlreq_context);
+	}
+
+	if (ret != 0)
+		imap_urlauth_connection_continue(conn);
+}
+
+static void
+imap_urlauth_target_abort(struct imap_urlauth_connection *conn,
+			  struct imap_urlauth_target *target)
+{
+	struct imap_urlauth_request *urlreq, *next;
+
+	urlreq = target->requests_head;
+	while (urlreq != NULL) {
+		next = urlreq->next;
+		imap_urlauth_request_abort(conn, urlreq);
+		urlreq = next;
+	}
+
+	imap_urlauth_target_free(conn, target);
+}
+
+static void
+imap_urlauth_target_fail(struct imap_urlauth_connection *conn,
+			 struct imap_urlauth_target *target, const char *error)
+{
+	struct imap_urlauth_request *urlreq, *next;
+
+	urlreq = target->requests_head;
+	while (urlreq != NULL) {
+		next = urlreq->next;
+		imap_urlauth_request_fail(conn, urlreq, error);
+		urlreq = next;
+	}
+
+	imap_urlauth_target_free(conn, target);
+}
+
+static void
+imap_urlauth_target_abort_by_context(struct imap_urlauth_connection *conn,
+				     struct imap_urlauth_target *target,
+				     void *context)
+{
+	struct imap_urlauth_request *urlreq, *next;
+
+	/* abort all matching requests */
+	urlreq = target->requests_head;
+	while (urlreq != NULL) {
+		next = urlreq->next;
+		if (urlreq->context == context)
+			imap_urlauth_request_abort(conn, urlreq);
+		urlreq = next;
+	}
+
+	if (target->requests_head == NULL)
+		imap_urlauth_target_free(conn, target);
+}
+
+static void
+imap_urlauth_connection_abort(struct imap_urlauth_connection *conn,
+			      const char *reason)
+{
+	struct imap_urlauth_target *target, *next;
+	
+	if (reason == NULL)
+		reason = "Aborting due to error";
+	imap_urlauth_connection_disconnect(conn, reason);
+
+	/* abort all requests */
+	target = conn->targets_head;
+	while (target != NULL) {
+		next = target->next;
+		imap_urlauth_target_abort(conn, target);
+		target = next;
+	}
+}
+
+void imap_urlauth_request_abort_by_context(struct imap_urlauth_connection *conn,
+					   void *context)
+{
+	struct imap_urlauth_target *target, *next;
+
+	/* abort all matching requests */
+	target = conn->targets_head;
+	while (target != NULL) {
+		next = target->next;
+		imap_urlauth_target_abort_by_context(conn, target, context);
+		target = next;
+	}
+}
+
+static void imap_urlauth_connection_fail(struct imap_urlauth_connection *conn)
+{
+	if (conn->reconnect_attempts > IMAP_URLAUTH_RECONNECT_MAX_ATTEMPTS) {
+		imap_urlauth_connection_abort(conn,
+			"Connection failed and connection attempts exhausted");
+	} else {
+		imap_urlauth_connection_reconnect(conn);
+	}
+}
+
+static int
+imap_urlauth_connection_create_temp_fd(struct imap_urlauth_connection *conn,
+				       const char **path_r)
+{
+	string_t *path;
+	int fd;
+
+	path = t_str_new(128);
+	mail_user_set_get_temp_prefix(path, conn->user->set);
+	fd = safe_mkstemp(path, 0600, (uid_t)-1, (gid_t)-1);
+	if (fd == -1) {
+		i_error("safe_mkstemp(%s) failed: %m", str_c(path));
+		return -1;
+	}
+
+	/* we just want the fd, unlink it */
+	if (i_unlink(str_c(path)) < 0) {
+		/* shouldn't happen.. */
+		i_close_fd(&fd);
+		return -1;
+	}
+
+	*path_r = str_c(path);
+	return fd;
+}
+
+static int
+imap_urlauth_connection_read_literal_init(struct imap_urlauth_connection *conn,
+					  uoff_t size)
+{
+	const char *path;
+
+	i_assert(conn->literal_fd == -1 && conn->literal_buf == NULL);
+
+	if (size <= IMAP_URLAUTH_MAX_INLINE_LITERAL_SIZE) {
+		/* read the literal directly */
+		if (size > 0) {
+			conn->literal_buf =
+				buffer_create_dynamic(default_pool, size);
+		}
+	} else {
+		/* read it into a file */
+		conn->literal_fd =
+			imap_urlauth_connection_create_temp_fd(conn, &path);
+		if (conn->literal_fd == -1)
+			return -1;
+		conn->literal_temp_path = i_strdup(path);
+	}
+
+	conn->literal_size = size;
+	conn->literal_bytes_left = size;
+	conn->reading_literal = TRUE;
+	return 1;
+}
+
+void imap_urlauth_connection_continue(struct imap_urlauth_connection *conn)
+{
+	i_assert(conn->targets_head != NULL);
+	i_assert(conn->targets_head->requests_head != NULL);
+
+	if (conn->state != IMAP_URLAUTH_STATE_REQUEST_WAIT)
+		return;
+
+	conn->state = IMAP_URLAUTH_STATE_READY;
+	imap_urlauth_request_free(conn->targets_head->requests_head);
+
+	imap_urlauth_connection_send_request(conn);
+}
+
+static int
+imap_urlauth_connection_read_literal_data(struct imap_urlauth_connection *conn)
+{
+	const unsigned char *data;
+	size_t size;
+
+	/* read data */
+	data = i_stream_get_data(conn->input, &size);
+	if (size > conn->literal_bytes_left)
+		size = conn->literal_bytes_left;
+
+	/* write to buffer or file */
+	if (size > 0) {
+		if (conn->literal_fd >= 0) {
+			if (write_full(conn->literal_fd, data, size) < 0) {
+				i_error("imap-urlauth: write(%s) failed: %m",
+					conn->literal_temp_path);
+				return -1;
+			}
+		} else {
+			i_assert(conn->literal_buf != NULL);
+			buffer_append(conn->literal_buf, data, size);
+		}
+		i_stream_skip(conn->input, size);
+		conn->literal_bytes_left -= size;
+	}
+
+	/* exit if not finished */
+	if (conn->literal_bytes_left > 0)
+		return 0;
+
+	/* read LF guard */
+	data = i_stream_get_data(conn->input, &size);
+	if (size < 1)
+		return 0;
+
+	/* check LF guard */
+	if (data[0] != '\n') {
+		i_error("imap-urlauth: no LF at end of literal (found 0x%x)",
+			data[0]);
+		return -1;
+	}
+	i_stream_skip(conn->input, 1);
+	return 1;
+}
+
+static void literal_stream_destroy(buffer_t *buffer)
+{
+	buffer_free(&buffer);
+}
+
+static int
+imap_urlauth_fetch_reply_set_literal_stream(struct imap_urlauth_connection *conn,
+					    struct imap_urlauth_fetch_reply *reply)
+{
+	const unsigned char *data;
+	size_t size;
+	uoff_t fd_size;
+
+	if (conn->literal_fd != -1) {
+		reply->input = i_stream_create_fd_autoclose(&conn->literal_fd,
+							    SIZE_MAX);
+		if (i_stream_get_size(reply->input, TRUE, &fd_size) < 1 ||
+		    fd_size != conn->literal_size) {
+			i_stream_unref(&reply->input);
+			i_error("imap-urlauth: Failed to obtain proper size from literal stream");
+			imap_urlauth_connection_abort(conn,
+				"Failed during literal transfer");
+			return -1;
+		}
+	} else {
+		data = buffer_get_data(conn->literal_buf, &size);
+		i_assert(size == conn->literal_size);
+		reply->input = i_stream_create_from_data(data, size);
+		i_stream_add_destroy_callback(reply->input,
+					      literal_stream_destroy,
+					      conn->literal_buf);
+	}
+	reply->size = conn->literal_size;
+	return 0;
+}
+
+static int
+imap_urlauth_connection_read_literal(struct imap_urlauth_connection *conn)
+{
+	struct imap_urlauth_request *urlreq = conn->targets_head->requests_head;
+	struct imap_urlauth_fetch_reply reply;
+	imap_urlauth_request_callback_t *callback;
+	int ret;
+
+	i_assert(conn->reading_literal);
+	i_assert(urlreq != NULL);
+
+	if (conn->literal_size > 0) {
+		ret = imap_urlauth_connection_read_literal_data(conn);
+		if (ret <= 0)
+			return ret;
+	}
+	i_assert(conn->literal_bytes_left == 0);
+
+	/* reply */
+	i_zero(&reply);
+	reply.url = urlreq->url;
+	reply.flags = urlreq->flags;
+	reply.bodypartstruct = urlreq->bodypartstruct;
+	reply.binary_has_nuls = urlreq->binary_has_nuls ? 1 : 0;
+
+	if (conn->literal_size > 0) {
+		if (imap_urlauth_fetch_reply_set_literal_stream(conn, &reply) < 0)
+			return -1;
+	}
+	reply.succeeded = TRUE;
+
+	ret = 1;
+	callback = urlreq->callback;
+	urlreq->callback = NULL;
+	if (callback != NULL) T_BEGIN {
+		ret = callback(&reply, urlreq->context);
+	} T_END;
+
+	if (reply.input != NULL)
+		i_stream_unref(&reply.input);
+
+	if (ret < 0) {
+		/* Drop any related requests upon error */
+		imap_urlauth_request_abort_by_context(conn, urlreq->context);
+	}
+
+	conn->state = IMAP_URLAUTH_STATE_REQUEST_WAIT;
+	if (ret != 0)
+		imap_urlauth_connection_continue(conn);
+
+	/* finished */
+	i_free_and_null(conn->literal_temp_path);
+	conn->literal_fd = -1;
+	conn->literal_buf = NULL;
+	conn->reading_literal = FALSE;
+	return 1;
+}
+
+static int imap_urlauth_input_pending(struct imap_urlauth_connection *conn)
+{
+	struct imap_urlauth_request *urlreq;
+	const char *response, *const *args, *bpstruct = NULL;
+	uoff_t literal_size;
+
+	i_assert(conn->targets_head != NULL);
+	i_assert(conn->targets_head->requests_head != NULL);
+	urlreq = conn->targets_head->requests_head;
+
+	if (conn->reading_literal) {
+		/* Read pending literal; may callback */
+		return imap_urlauth_connection_read_literal(conn);
+	}
+
+	/* "OK"[<metadata-items>]"\t"<literal-size>"\n" or
+	   "NO"["\terror="<error>]"\n" */
+	if ((response = i_stream_next_line(conn->input)) == NULL)
+		return 0;
+	imap_urlauth_stop_response_timeout(conn);
+
+	args = t_strsplit_tabescaped(response);
+	if (args[0] == NULL) {
+		i_error("imap-urlauth: Empty URL response: %s",
+			str_sanitize(response, 80));
+		return -1;
+	}
+
+	if (strcmp(args[0], "OK") != 0 || args[1] == NULL) {
+		if (strcmp(args[0], "NO") == 0) {
+			const char *param = args[1], *error = NULL;
+
+			if (param != NULL &&
+			    strncasecmp(param, "error=", 6) == 0 &&
+			    param[6] != '\0') {
+				error = param+6;
+			}
+			conn->state = IMAP_URLAUTH_STATE_REQUEST_WAIT;
+			imap_urlauth_request_fail(conn,
+				conn->targets_head->requests_head, error);
+			return 1;
+		}
+		i_error("imap-urlauth: Unexpected URL response: %s",
+			str_sanitize(response, 80));
+		return -1;
+	}
+
+	/* read metadata */
+	args++;
+	for (; args[1] != NULL; args++) {
+		const char *param = args[0];
+
+		if (strcasecmp(param, "hasnuls") == 0) {
+			urlreq->binary_has_nuls = TRUE;
+		} else if (strncasecmp(param, "bpstruct=", 9) == 0 &&
+			   param[9] != '\0') {
+			bpstruct = param+9;
+		}
+	}
+
+	/* read literal size */
+	if (str_to_uoff(args[0], &literal_size) < 0) {
+		i_error("imap-urlauth: "
+			"Overflowing unsigned integer value for literal size: %s",
+			args[1]);
+		return -1;
+	}
+
+	/* read literal */
+	if (imap_urlauth_connection_read_literal_init(conn, literal_size) < 0)
+		return -1;
+
+	urlreq->bodypartstruct = i_strdup(bpstruct);
+	return imap_urlauth_connection_read_literal(conn);
+}
+
+static int imap_urlauth_input_next(struct imap_urlauth_connection *conn)
+{
+	const char *response;
+	int ret;
+
+	switch (conn->state) {
+	case IMAP_URLAUTH_STATE_AUTHENTICATING:
+	case IMAP_URLAUTH_STATE_UNSELECTING_TARGET:
+		if ((response = i_stream_next_line(conn->input)) == NULL)
+			return 0;
+		imap_urlauth_stop_response_timeout(conn);
+
+		if (strcasecmp(response, "OK") != 0) {
+			if (conn->state == IMAP_URLAUTH_STATE_AUTHENTICATING)
+				i_error("imap-urlauth: Failed to authenticate to service: "
+					"Got unexpected response: %s", str_sanitize(response, 80));
+			else
+				i_error("imap-urlauth: Failed to unselect target user: "
+					"Got unexpected response: %s", str_sanitize(response, 80));
+			imap_urlauth_connection_abort(conn, NULL);
+			return -1;
+		}
+
+		if (conn->state == IMAP_URLAUTH_STATE_AUTHENTICATING) {
+			e_debug(conn->user->event,
+				"imap-urlauth: Successfully authenticated to service");
+		} else {
+			e_debug(conn->user->event,
+				"imap-urlauth: Successfully unselected target user");
+		}
+
+		conn->state = IMAP_URLAUTH_STATE_AUTHENTICATED;
+		imap_urlauth_connection_select_target(conn);
+		return 0;
+	case IMAP_URLAUTH_STATE_SELECTING_TARGET:
+		if ((response = i_stream_next_line(conn->input)) == NULL)
+			return 0;
+		imap_urlauth_stop_response_timeout(conn);
+
+		i_assert(conn->targets_head != NULL);
+
+		if (strcasecmp(response, "NO") == 0) {
+			e_debug(conn->user->event,
+				"imap-urlauth: Failed to select target user %s",
+				conn->targets_head->userid);
+			imap_urlauth_target_fail(conn, conn->targets_head, NULL);
+
+			conn->state = IMAP_URLAUTH_STATE_AUTHENTICATED;
+			imap_urlauth_connection_select_target(conn);
+			return 0;
+		}
+		if (strcasecmp(response, "OK") != 0) {
+			i_error("imap-urlauth: Failed to select target user %s: "
+				"Got unexpected response: %s", conn->targets_head->userid,
+				str_sanitize(response, 80));
+			imap_urlauth_connection_abort(conn, NULL);
+			return -1;
+		}
+
+		e_debug(conn->user->event,
+			"imap-urlauth: Successfully selected target user %s",
+			conn->targets_head->userid);
+		conn->state = IMAP_URLAUTH_STATE_READY;
+		imap_urlauth_connection_send_request(conn);
+		return 0;
+	case IMAP_URLAUTH_STATE_AUTHENTICATED:
+	case IMAP_URLAUTH_STATE_READY:
+	case IMAP_URLAUTH_STATE_REQUEST_WAIT:
+		if ((response = i_stream_next_line(conn->input)) == NULL)
+			return 0;
+
+		i_error("imap-urlauth: Received input while no requests were pending: %s",
+			str_sanitize(response, 80));
+		imap_urlauth_connection_abort(conn, NULL);
+		return -1;
+	case IMAP_URLAUTH_STATE_REQUEST_PENDING:
+		if ((ret = imap_urlauth_input_pending(conn)) < 0)
+			imap_urlauth_connection_fail(conn);
+		return ret;
+	case IMAP_URLAUTH_STATE_DISCONNECTED:
+		break;
+	}
+	i_unreached();
+}
+
+static void imap_urlauth_input(struct imap_urlauth_connection *conn)
+{
+	i_assert(conn->state != IMAP_URLAUTH_STATE_DISCONNECTED);
+
+	if (conn->input->closed) {
+		/* disconnected */
+		i_error("imap-urlauth: Service disconnected unexpectedly");
+		imap_urlauth_connection_fail(conn);
+		return;
+	}
+
+	switch (i_stream_read(conn->input)) {
+	case -1:
+		/* disconnected */
+		i_error("imap-urlauth: Service disconnected unexpectedly");
+		imap_urlauth_connection_fail(conn);
+		return;
+	case -2:
+		/* input buffer full */
+		i_error("imap-urlauth: Service sent too large input");
+		imap_urlauth_connection_abort(conn, NULL);
+		return;
+	}
+
+	while (!conn->input->closed) {
+		if (imap_urlauth_input_next(conn) <= 0)
+			break;
+	}
+}
+
+static int
+imap_urlauth_connection_do_connect(struct imap_urlauth_connection *conn)
+{
+	string_t *str;
+	int fd;
+
+	if (conn->state != IMAP_URLAUTH_STATE_DISCONNECTED) {
+		imap_urlauth_connection_send_request(conn);
+		return 1;
+	}
+
+	if (conn->user->auth_token == NULL) {
+		i_error("imap-urlauth: cannot authenticate because no auth token "
+			"is available for this session (running standalone?).");
+		imap_urlauth_connection_abort(conn, NULL);
+		return -1;
+	}
+
+	e_debug(conn->user->event, "imap-urlauth: Connecting to service at %s", conn->path);
+
+	i_assert(conn->fd == -1);
+	fd = net_connect_unix(conn->path);
+	if (fd == -1) {
+		i_error("imap-urlauth: net_connect_unix(%s) failed: %m",
+			conn->path);
+		imap_urlauth_connection_abort(conn, NULL);
+		return -1;
+	}
+
+	timeout_remove(&conn->to_reconnect);
+
+	conn->fd = fd;
+	conn->input = i_stream_create_fd(fd, SIZE_MAX);
+	conn->output = o_stream_create_fd(fd, SIZE_MAX);
+	conn->io = io_add(fd, IO_READ, imap_urlauth_input, conn);
+	conn->state = IMAP_URLAUTH_STATE_AUTHENTICATING;
+
+	str = t_str_new(128);
+	str_printfa(str, IMAP_URLAUTH_HANDSHAKE"AUTH\t%s\t%s\t",
+		conn->service, my_pid);
+	str_append_tabescaped(str, conn->user->username);
+	str_append_c(str, '\t');
+	if (conn->session_id != NULL)
+		str_append_tabescaped(str, conn->session_id);
+	str_append_c(str, '\t');
+	str_append_tabescaped(str, conn->user->auth_token);
+	str_append_c(str, '\n');
+	if (o_stream_send(conn->output, str_data(str), str_len(str)) < 0) {
+		i_warning("Error sending handshake to imap-urlauth server: %m");
+		imap_urlauth_connection_abort(conn, NULL);
+		return -1;
+	}
+
+	imap_urlauth_start_response_timeout(conn);
+	return 0;
+}
+
+int imap_urlauth_connection_connect(struct imap_urlauth_connection *conn)
+{
+	conn->reconnect_attempts = 0;
+
+	if (conn->to_reconnect == NULL)
+		return imap_urlauth_connection_do_connect(conn);
+	return 0;
+}
+
+static void imap_urlauth_connection_disconnect
+(struct imap_urlauth_connection *conn, const char *reason)
+{
+	conn->state = IMAP_URLAUTH_STATE_DISCONNECTED;
+
+	if (conn->fd != -1) {
+		if (reason == NULL)
+			e_debug(conn->user->event, "imap-urlauth: Disconnecting from service");
+		else
+			e_debug(conn->user->event, "imap-urlauth: Disconnected: %s", reason);
+
+		io_remove(&conn->io);
+		i_stream_destroy(&conn->input);
+		o_stream_destroy(&conn->output);
+		net_disconnect(conn->fd);
+		conn->fd = -1;
+	}
+	conn->reading_literal = FALSE;
+
+	if (conn->literal_fd != -1) {
+		if (close(conn->literal_fd) < 0)
+			i_error("imap-urlauth: close(%s) failed: %m", conn->literal_temp_path);
+
+		i_free_and_null(conn->literal_temp_path);
+		conn->literal_fd = -1;
+	}
+
+	buffer_free(&conn->literal_buf);
+	timeout_remove(&conn->to_reconnect);
+	timeout_remove(&conn->to_idle);
+	imap_urlauth_stop_response_timeout(conn);
+}
+
+static void
+imap_urlauth_connection_do_reconnect(struct imap_urlauth_connection *conn)
+{
+	if (conn->reconnect_attempts >= IMAP_URLAUTH_RECONNECT_MAX_ATTEMPTS) {
+		imap_urlauth_connection_abort(conn,
+			"Connection failed and connection attempts exhausted");
+		return;
+	}
+
+	if (ioloop_time - conn->last_reconnect < IMAP_URLAUTH_RECONNECT_MIN_SECS) {
+		e_debug(conn->user->event, "imap-urlauth: Scheduling reconnect");
+		timeout_remove(&conn->to_reconnect);
+		conn->to_reconnect =
+			timeout_add(IMAP_URLAUTH_RECONNECT_MIN_SECS*1000,
+				imap_urlauth_connection_do_reconnect, conn);
+	} else {
+		conn->reconnect_attempts++;
+		conn->last_reconnect = ioloop_time;
+		(void)imap_urlauth_connection_do_connect(conn);
+	}
+}
+
+static void
+imap_urlauth_connection_reconnect(struct imap_urlauth_connection *conn)
+{
+	imap_urlauth_connection_disconnect(conn, NULL);
+
+	/* don't reconnect if there are no requests */
+	if (conn->targets_head == NULL)
+		return;
+
+	imap_urlauth_connection_do_reconnect(conn);
+}
+
+static void
+imap_urlauth_connection_idle_disconnect(struct imap_urlauth_connection *conn)
+{
+	imap_urlauth_connection_disconnect(conn, "Idle timeout");
+}
+
+static void
+imap_urlauth_connection_timeout_abort(struct imap_urlauth_connection *conn)
+{
+	imap_urlauth_connection_abort(conn, "Service is not responding");
+}
+
+bool imap_urlauth_connection_is_connected(struct imap_urlauth_connection *conn)
+{
+	return conn->fd != -1 && conn->state != IMAP_URLAUTH_STATE_DISCONNECTED;
+}
diff --git a/src/lib-imap-urlauth/imap-urlauth-connection.h b/src/lib-imap-urlauth/imap-urlauth-connection.h
new file mode 100644
index 0000000..b60186a
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth-connection.h
@@ -0,0 +1,42 @@
+#ifndef IMAP_URLAUTH_CONNECTION_H
+#define IMAP_URLAUTH_CONNECTION_H
+
+struct imap_urlauth_request;
+struct imap_urlauth_fetch_reply;
+
+typedef int
+imap_urlauth_request_callback_t(struct imap_urlauth_fetch_reply *reply,
+				void *context);
+
+/* If reconnect_callback is specified, it's called when connection is lost.
+   If the callback returns FALSE, reconnection isn't attempted. */
+struct imap_urlauth_connection *
+imap_urlauth_connection_init(const char *path, const char *service,
+			     struct mail_user *user, const char *session_id,
+			     unsigned int idle_timeout_msecs);
+void imap_urlauth_connection_deinit(struct imap_urlauth_connection **conn);
+
+/* Connect to imap-urlauth (even if failed for previous requests). */
+int imap_urlauth_connection_connect(struct imap_urlauth_connection *conn);
+
+/* Continue after request callback returned 0 */
+void imap_urlauth_connection_continue(struct imap_urlauth_connection *conn);
+
+/* Create a new URL fetch request */
+struct imap_urlauth_request *
+imap_urlauth_request_new(struct imap_urlauth_connection *conn,
+			 const char *target_user, const char *url,
+			 enum imap_urlauth_fetch_flags flags,
+			 imap_urlauth_request_callback_t *callback,
+			 void *context);
+/* Abort request */
+void imap_urlauth_request_abort(struct imap_urlauth_connection *conn,
+				struct imap_urlauth_request *urlreq);
+/* Abort all requests with matching context value */
+void imap_urlauth_request_abort_by_context(struct imap_urlauth_connection *conn,
+					   void *context);
+
+/* Returns TRUE if currently connected imap-urlauth service. */
+bool imap_urlauth_connection_is_connected(struct imap_urlauth_connection *conn);
+
+#endif
diff --git a/src/lib-imap-urlauth/imap-urlauth-fetch.c b/src/lib-imap-urlauth/imap-urlauth-fetch.c
new file mode 100644
index 0000000..d5746f1
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth-fetch.c
@@ -0,0 +1,530 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "llist.h"
+#include "array.h"
+#include "net.h"
+#include "istream.h"
+#include "mail-user.h"
+#include "mail-error.h"
+#include "mail-storage.h"
+#include "imap-url.h"
+#include "imap-msgpart-url.h"
+#include "imap-urlauth-private.h"
+#include "imap-urlauth-fetch.h"
+#include "imap-urlauth-connection.h"
+
+struct imap_urlauth_fetch_url {
+	struct imap_urlauth_fetch_url *prev, *next;
+
+	char *url;
+	enum imap_urlauth_fetch_flags flags;
+};
+
+struct imap_urlauth_fetch {
+	unsigned int refcount;
+	struct imap_urlauth_context *uctx;
+
+	imap_urlauth_fetch_callback_t *callback;
+	void *context;
+
+	/* local urls */
+	struct imap_urlauth_fetch_url *local_urls_head, *local_urls_tail;
+	struct imap_msgpart_url *local_url;
+
+	unsigned int pending_requests;
+
+	struct {
+		char *url;
+		enum imap_urlauth_fetch_flags flags;
+
+		struct istream *input;
+		uoff_t size;
+
+		char *bodypartstruct;
+		char *error;
+
+		bool succeeded:1;
+		bool binary_has_nuls:1;
+	} pending_reply;
+
+	bool failed:1;
+	bool waiting_local:1;
+	bool waiting_service:1;
+};
+
+static void imap_urlauth_fetch_abort_local(struct imap_urlauth_fetch *ufetch)
+{
+	struct imap_urlauth_fetch_url *url, *url_next;
+
+	if (ufetch->local_url != NULL) {
+		ufetch->pending_requests--;
+		imap_msgpart_url_free(&ufetch->local_url);
+	}
+
+	i_free_and_null(ufetch->pending_reply.url);
+	i_free_and_null(ufetch->pending_reply.bodypartstruct);
+	i_free_and_null(ufetch->pending_reply.error);
+	i_stream_unref(&ufetch->pending_reply.input);
+
+	url = ufetch->local_urls_head;
+	for (; url != NULL; url = url_next) {
+		url_next = url->next;
+		i_free(url->url);
+		i_free(url);
+		ufetch->pending_requests--;
+	}
+	ufetch->local_urls_head = ufetch->local_urls_tail = NULL;
+}
+
+static void imap_urlauth_fetch_abort(struct imap_urlauth_fetch *ufetch)
+{
+	if (ufetch->pending_requests > 0)
+		imap_urlauth_request_abort_by_context(ufetch->uctx->conn, ufetch);
+
+	imap_urlauth_fetch_abort_local(ufetch);
+
+	i_assert(ufetch->pending_requests == 0);
+}
+
+static void imap_urlauth_fetch_fail(struct imap_urlauth_fetch *ufetch)
+{
+	imap_urlauth_fetch_abort(ufetch);
+	ufetch->failed = TRUE;
+}
+
+struct imap_urlauth_fetch *
+imap_urlauth_fetch_init(struct imap_urlauth_context *uctx,
+			imap_urlauth_fetch_callback_t *callback, void *context)
+{
+	struct imap_urlauth_fetch *ufetch;
+
+	ufetch = i_new(struct imap_urlauth_fetch, 1);
+	ufetch->refcount = 1;
+	ufetch->uctx = uctx;
+	ufetch->callback = callback;
+	ufetch->context = context;
+	return ufetch;
+}
+
+static void imap_urlauth_fetch_ref(struct imap_urlauth_fetch *ufetch)
+{
+	i_assert(ufetch->refcount > 0);
+	ufetch->refcount++;
+}
+
+static void imap_urlauth_fetch_unref(struct imap_urlauth_fetch **_ufetch)
+{
+	struct imap_urlauth_fetch *ufetch = *_ufetch;
+
+	i_assert(ufetch->refcount > 0);
+
+	*_ufetch = NULL;
+	if (--ufetch->refcount > 0)
+		return;
+
+	ufetch->refcount++;
+	imap_urlauth_fetch_abort(ufetch);
+	ufetch->refcount--;
+	i_assert(ufetch->refcount == 0);
+
+	/* dont leave the connection in limbo; make sure continue is called */
+	if (ufetch->waiting_service)
+		imap_urlauth_connection_continue(ufetch->uctx->conn);
+	i_free(ufetch);
+}
+
+void imap_urlauth_fetch_deinit(struct imap_urlauth_fetch **_ufetch)
+{
+	imap_urlauth_fetch_unref(_ufetch);
+}
+
+static void
+imap_urlauth_fetch_error(struct imap_urlauth_fetch *ufetch, const char *url,
+			 enum imap_urlauth_fetch_flags url_flags,
+			 const char *error)
+{
+	struct imap_urlauth_fetch_reply reply;
+	int ret;
+
+	ufetch->pending_requests--;
+
+	i_zero(&reply);
+	reply.url = url;
+	reply.flags = url_flags;
+	reply.succeeded = FALSE;
+	reply.error = error;
+
+	T_BEGIN {
+		ret = ufetch->callback(&reply, ufetch->pending_requests == 0,
+				       ufetch->context);
+	} T_END;
+
+	if (ret == 0) {
+		ufetch->waiting_local = TRUE;
+		ufetch->pending_requests++;
+	} else if (ret < 0) {
+		imap_urlauth_fetch_fail(ufetch);
+	}
+}
+
+static void
+imap_urlauth_fetch_local(struct imap_urlauth_fetch *ufetch, const char *url,
+			 enum imap_urlauth_fetch_flags url_flags,
+			 struct imap_url *imap_url)
+{
+	struct imap_urlauth_fetch_reply reply;
+	struct imap_msgpart_open_result mpresult;
+	const char *error, *errormsg = NULL, *bpstruct = NULL;
+	bool debug = ufetch->uctx->user->mail_debug, success;
+	enum mail_error error_code;
+	struct imap_msgpart_url *mpurl = NULL;
+	int ret;
+
+	success = TRUE;
+
+	if (debug)
+		i_debug("Fetching local URLAUTH %s", url);
+
+	if (url_flags == 0)
+		url_flags = IMAP_URLAUTH_FETCH_FLAG_BODY;
+
+	/* fetch URL */
+	if (imap_url == NULL) {
+		ret = imap_urlauth_fetch(ufetch->uctx, url,
+					 &mpurl, &error_code, &error);
+	} else {
+		ret = imap_urlauth_fetch_parsed(ufetch->uctx, imap_url,
+						&mpurl, &error_code, &error);
+	}
+	if (ret <= 0) {
+		if (ret == 0) {
+			errormsg = t_strdup_printf("Failed to fetch URLAUTH \"%s\": %s",
+						   url, error);
+			if (debug)
+				i_debug("%s", errormsg);
+		}
+		success = FALSE;
+	}
+
+	/* fetch metadata */
+	if (success && (url_flags & IMAP_URLAUTH_FETCH_FLAG_BINARY) != 0)
+		imap_msgpart_url_set_decode_to_binary(mpurl);
+	if (success &&
+	    (url_flags & IMAP_URLAUTH_FETCH_FLAG_BODYPARTSTRUCTURE) != 0) {
+		ret = imap_msgpart_url_get_bodypartstructure(mpurl, &bpstruct, &error);
+		if (ret <= 0) {
+			if (ret == 0) {
+				errormsg = t_strdup_printf
+					("Failed to read URLAUTH \"%s\": %s",	url, error);
+				if (debug)
+					i_debug("%s", errormsg);
+			}
+			success = FALSE;
+		}
+	}
+
+	/* if requested, read the message part the URL points to */
+	i_zero(&mpresult);
+	if (success && ((url_flags & IMAP_URLAUTH_FETCH_FLAG_BODY) != 0 ||
+			(url_flags & IMAP_URLAUTH_FETCH_FLAG_BINARY) != 0)) {
+		ret = imap_msgpart_url_read_part(mpurl, &mpresult, &error);
+		if (ret <= 0) {
+			if (ret == 0) {
+				errormsg = t_strdup_printf
+					("Failed to read URLAUTH \"%s\": %s",	url, error);
+				if (debug)
+					i_debug("%s", errormsg);
+			}
+			success = FALSE;
+		}
+	}
+
+	if (debug && success) {
+		if (bpstruct != NULL)
+			i_debug("Fetched URLAUTH yielded BODYPARTSTRUCTURE (%s)", bpstruct);
+		if (mpresult.size == 0 || mpresult.input == NULL)
+			i_debug("Fetched URLAUTH yielded empty result");
+		else {
+			i_debug("Fetched URLAUTH yielded %"PRIuUOFF_T" bytes "
+				"of %smessage data", mpresult.size,
+				(mpresult.binary_decoded_input_has_nuls ? "binary " : ""));
+		}
+	}
+
+	ufetch->pending_requests--;
+
+	if (!success && ret < 0) {
+		if (mpurl != NULL)
+			imap_msgpart_url_free(&mpurl);
+		(void)ufetch->callback(NULL, TRUE, ufetch->context);
+		imap_urlauth_fetch_fail(ufetch);
+		return;
+	}
+
+	i_zero(&reply);
+	reply.url = url;
+	reply.flags = url_flags;
+	reply.error = errormsg;
+	reply.succeeded = success;
+
+	reply.bodypartstruct = bpstruct;
+	reply.binary_has_nuls = mpresult.binary_decoded_input_has_nuls;
+	reply.size = mpresult.size;
+	reply.input = mpresult.input;
+
+	ret = ufetch->callback(&reply, ufetch->pending_requests == 0,
+			       ufetch->context);
+	if (ret == 0) {
+		ufetch->local_url = mpurl;
+		ufetch->waiting_local = TRUE;
+		ufetch->pending_requests++;
+	} else {
+
+		if (mpurl != NULL)
+			imap_msgpart_url_free(&mpurl);
+		if (ret < 0)
+			imap_urlauth_fetch_fail(ufetch);
+	}
+}
+
+static int
+imap_urlauth_fetch_request_callback(struct imap_urlauth_fetch_reply *reply,
+				    void *context)
+{
+	struct imap_urlauth_fetch *ufetch =
+		(struct imap_urlauth_fetch *)context;
+	int ret = 1;
+
+	if (ufetch->waiting_local && reply != NULL) {
+		i_assert(ufetch->pending_reply.url == NULL);
+		ufetch->pending_reply.url = i_strdup(reply->url);
+		ufetch->pending_reply.flags = reply->flags;
+		ufetch->pending_reply.bodypartstruct =
+			i_strdup(reply->bodypartstruct);
+		ufetch->pending_reply.error = i_strdup(reply->error);
+		if (reply->input != NULL) {
+			ufetch->pending_reply.input = reply->input;
+			i_stream_ref(ufetch->pending_reply.input);
+		}
+		ufetch->pending_reply.size = reply->size;
+		ufetch->pending_reply.succeeded = reply->succeeded;
+		ufetch->pending_reply.binary_has_nuls = reply->binary_has_nuls;
+		ufetch->waiting_service = TRUE;
+		return 0;
+	}
+
+	ufetch->waiting_local = FALSE;
+	ufetch->pending_requests--;
+
+	imap_urlauth_fetch_ref(ufetch);
+
+	if (!ufetch->failed) {
+		bool last = ufetch->pending_requests == 0 || reply == NULL;
+		ret = ufetch->callback(reply, last, ufetch->context);
+	}
+
+	/* report failure only once */
+	if (ret < 0 || reply == NULL) {
+		if (!ufetch->failed)
+			imap_urlauth_fetch_abort_local(ufetch);
+		ufetch->failed = TRUE;
+	} else if (ret == 0) {
+		ufetch->waiting_service = TRUE;
+		ufetch->pending_requests++;
+	}
+	
+	imap_urlauth_fetch_unref(&ufetch);
+	return ret;
+}
+
+int imap_urlauth_fetch_url(struct imap_urlauth_fetch *ufetch, const char *url,
+			   enum imap_urlauth_fetch_flags url_flags)
+{
+	struct imap_urlauth_context *uctx = ufetch->uctx;
+	enum imap_url_parse_flags url_parse_flags =
+		IMAP_URL_PARSE_ALLOW_URLAUTH;
+	struct mail_user *mail_user = uctx->user;
+	struct imap_url *imap_url;
+	const char *error, *errormsg;
+
+	/* parse the url */
+	if (imap_url_parse(url, NULL, url_parse_flags, &imap_url, &error) < 0) {
+		errormsg = t_strdup_printf(
+			"Failed to fetch URLAUTH \"%s\": %s", url, error);
+		e_debug(mail_user->event, "%s", errormsg);
+		ufetch->pending_requests++;
+		imap_urlauth_fetch_ref(ufetch);
+		imap_urlauth_fetch_error(ufetch, url, url_flags, errormsg);
+		imap_urlauth_fetch_unref(&ufetch);
+		return 1;
+	}
+
+	return imap_urlauth_fetch_url_parsed(ufetch, url, imap_url, url_flags);
+}
+
+int imap_urlauth_fetch_url_parsed(struct imap_urlauth_fetch *ufetch,
+			   const char *url, struct imap_url *imap_url,
+			   enum imap_urlauth_fetch_flags url_flags)
+{
+	struct imap_urlauth_context *uctx = ufetch->uctx;
+	struct mail_user *mail_user = uctx->user;
+	const char *error, *errormsg;
+	int ret = 0;
+
+	ufetch->failed = FALSE;
+	ufetch->pending_requests++;
+
+	imap_urlauth_fetch_ref(ufetch);
+
+	/* if access user and target user match, handle fetch request locally */
+	if (imap_url->userid != NULL &&
+		strcmp(mail_user->username, imap_url->userid) == 0) {
+
+		if (ufetch->waiting_local) {
+			struct imap_urlauth_fetch_url *url_local;
+
+			url_local = i_new(struct imap_urlauth_fetch_url, 1);
+			url_local->url = i_strdup(url);
+			url_local->flags = url_flags;
+
+			DLLIST2_APPEND(&ufetch->local_urls_head,
+				       &ufetch->local_urls_tail, url_local);
+		} else T_BEGIN {
+			imap_urlauth_fetch_local(ufetch, url,
+						 url_flags, imap_url);
+		} T_END;
+		imap_url = NULL;
+	/* don't try to fetch remote URLs that are already known to fail access */
+	} else if (!imap_urlauth_check(uctx, imap_url, TRUE, &error)) {
+		errormsg = t_strdup_printf(
+			"Failed to fetch URLAUTH \"%s\": %s", url, error);
+		e_debug(mail_user->event, "%s", errormsg);
+		imap_urlauth_fetch_error(ufetch, url, url_flags, errormsg);
+		imap_url = NULL;
+	}
+
+	/* create request for url */
+	if (imap_url != NULL && imap_url->userid != NULL) {
+		i_assert(uctx->conn != NULL);
+		(void)imap_urlauth_request_new(uctx->conn, imap_url->userid,
+				url, url_flags,
+				imap_urlauth_fetch_request_callback, ufetch);
+		i_assert(uctx->conn != NULL);
+		if (imap_urlauth_connection_connect(uctx->conn) < 0)
+			ret = -1;
+	}
+	if (ret >= 0)
+		ret = (ufetch->pending_requests > 0 ? 0 : 1);
+
+	imap_urlauth_fetch_unref(&ufetch);
+	return ret;
+}
+
+static bool imap_urlauth_fetch_do_continue(struct imap_urlauth_fetch *ufetch)
+{
+	struct imap_urlauth_fetch_url *url, *url_next;
+	int ret;
+
+	if (ufetch->failed)
+		return FALSE;
+
+	if (!ufetch->waiting_local && !ufetch->waiting_service) {
+		/* not currently waiting for anything */
+		return ufetch->pending_requests > 0;
+	}
+
+	/* we finished a request */
+	ufetch->pending_requests--;
+
+	if (!ufetch->waiting_local) {
+		/* not waiting for local request handling */
+		ufetch->waiting_service = FALSE;
+		imap_urlauth_connection_continue(ufetch->uctx->conn);
+		return ufetch->pending_requests > 0;
+	}
+
+	/* finished local request */
+	if (ufetch->local_url != NULL) {
+		imap_msgpart_url_free(&ufetch->local_url);
+	}
+	ufetch->waiting_local = FALSE;
+
+	/* handle pending remote reply */
+	if (ufetch->pending_reply.url != NULL) {
+		struct imap_urlauth_fetch_reply reply;
+
+		ufetch->pending_requests--;
+
+		i_zero(&reply);
+		reply.url = ufetch->pending_reply.url;
+		reply.flags = ufetch->pending_reply.flags;
+		reply.bodypartstruct = ufetch->pending_reply.bodypartstruct;
+		reply.error = ufetch->pending_reply.error;
+		reply.input = ufetch->pending_reply.input;
+		reply.size = ufetch->pending_reply.size;
+		reply.succeeded = ufetch->pending_reply.succeeded;
+		reply.binary_has_nuls = ufetch->pending_reply.binary_has_nuls;
+
+		ret = ufetch->callback(&reply, ufetch->pending_requests == 0,
+				       ufetch->context);
+
+		if (ufetch->pending_reply.url != NULL)
+			i_free(ufetch->pending_reply.url);
+		if (ufetch->pending_reply.input != NULL)
+			i_stream_unref(&ufetch->pending_reply.input);
+		if (ufetch->pending_reply.bodypartstruct != NULL)
+			i_free(ufetch->pending_reply.bodypartstruct);
+		if (ufetch->pending_reply.error != NULL)
+			i_free(ufetch->pending_reply.error);
+
+		if (ret < 0) {
+			imap_urlauth_fetch_fail(ufetch);
+			return FALSE;
+		} 
+
+		if (ret == 0) {
+			ufetch->waiting_service = TRUE;
+			ufetch->pending_requests++;
+			return TRUE;
+		}
+
+		ufetch->waiting_service = FALSE;
+		imap_urlauth_connection_continue(ufetch->uctx->conn);
+	}
+
+	/* handle pending local urls */
+	url = ufetch->local_urls_head;
+	while (url != NULL) {
+		url_next = url->next;
+		T_BEGIN {
+			imap_urlauth_fetch_local(ufetch, url->url,
+						 url->flags, NULL);
+		} T_END;
+		DLLIST2_REMOVE(&ufetch->local_urls_head,
+			       &ufetch->local_urls_tail, url);
+		i_free(url->url);
+		i_free(url);
+		if (ufetch->waiting_local) 
+			return TRUE;
+		url = url_next;
+	}
+
+	return ufetch->pending_requests > 0;
+}
+
+bool imap_urlauth_fetch_continue(struct imap_urlauth_fetch *ufetch)
+{
+	bool pending;
+
+	imap_urlauth_fetch_ref(ufetch);
+	pending = imap_urlauth_fetch_do_continue(ufetch);
+	imap_urlauth_fetch_unref(&ufetch);
+
+	return pending;
+}
+
+bool imap_urlauth_fetch_is_pending(struct imap_urlauth_fetch *ufetch)
+{
+	return ufetch->pending_requests > 0;
+}
diff --git a/src/lib-imap-urlauth/imap-urlauth-fetch.h b/src/lib-imap-urlauth/imap-urlauth-fetch.h
new file mode 100644
index 0000000..628a95e
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth-fetch.h
@@ -0,0 +1,56 @@
+#ifndef IMAP_URLAUTH_FETCH_H
+#define IMAP_URLAUTH_FETCH_H
+
+struct imap_url;
+struct imap_urlauth_context;
+struct imap_urlauth_fetch;
+
+enum imap_urlauth_fetch_flags {
+	/* Indicates that this is an extended request */
+	IMAP_URLAUTH_FETCH_FLAG_EXTENDED		= 0x01,
+	/* Fetch body part unmodified */
+	IMAP_URLAUTH_FETCH_FLAG_BODY			= 0x02,
+	/* Fetch body part as binary, i.e. without content encoding */
+	IMAP_URLAUTH_FETCH_FLAG_BINARY			= 0x04,
+	/* Fetch IMAP bodypartstructure */
+	IMAP_URLAUTH_FETCH_FLAG_BODYPARTSTRUCTURE	= 0x08,
+};
+
+struct imap_urlauth_fetch_reply {
+	const char *url;
+	enum imap_urlauth_fetch_flags flags;
+
+	struct istream *input;
+	uoff_t size;
+
+	const char *bodypartstruct;
+	const char *error;
+
+	bool succeeded:1;
+	bool binary_has_nuls:1;
+};
+
+/* Callback to handle fetch reply. Returns 1 if handled completely and ready
+   for next reply, 0 if not all data was processed, and -1 for error. If a
+   callback returns 0, imap_urlauth_fetch_continue() must be called once
+   new replies may be processed. If this is the last request to yield a reply,
+   argument last is TRUE. */
+typedef int
+imap_urlauth_fetch_callback_t(struct imap_urlauth_fetch_reply *reply,
+			      bool last, void *context);
+
+struct imap_urlauth_fetch *
+imap_urlauth_fetch_init(struct imap_urlauth_context *uctx,
+			imap_urlauth_fetch_callback_t *callback, void *context);
+void imap_urlauth_fetch_deinit(struct imap_urlauth_fetch **ufetch);
+
+int imap_urlauth_fetch_url(struct imap_urlauth_fetch *ufetch, const char *url,
+			   enum imap_urlauth_fetch_flags url_flags);
+int imap_urlauth_fetch_url_parsed(struct imap_urlauth_fetch *ufetch,
+			   const char *url, struct imap_url *imap_url,
+			   enum imap_urlauth_fetch_flags url_flags);
+
+bool imap_urlauth_fetch_continue(struct imap_urlauth_fetch *ufetch);
+bool imap_urlauth_fetch_is_pending(struct imap_urlauth_fetch *ufetch);
+
+#endif
diff --git a/src/lib-imap-urlauth/imap-urlauth-private.h b/src/lib-imap-urlauth/imap-urlauth-private.h
new file mode 100644
index 0000000..3b3622c
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth-private.h
@@ -0,0 +1,20 @@
+#ifndef IMAP_URLAUTH_PRIVATE_H
+#define IMAP_URLAUTH_PRIVATE_H
+
+#include "imap-urlauth.h"
+
+struct imap_urlauth_context {
+	struct mail_user *user;
+	struct imap_urlauth_connection *conn;
+
+	char *url_host;
+	in_port_t url_port;
+
+	char *access_user;
+	char *access_service;
+	const char **access_applications;
+
+	bool access_anonymous:1;
+};
+
+#endif
diff --git a/src/lib-imap-urlauth/imap-urlauth.c b/src/lib-imap-urlauth/imap-urlauth.c
new file mode 100644
index 0000000..a9c2673
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth.c
@@ -0,0 +1,486 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "hostpid.h"
+#include "var-expand.h"
+#include "hmac.h"
+#include "sha1.h"
+#include "randgen.h"
+#include "safe-memset.h"
+#include "mail-storage.h"
+#include "mail-storage-service.h"
+#include "mail-namespace.h"
+#include "mail-user.h"
+#include "imap-url.h"
+#include "imap-msgpart-url.h"
+#include "imap-urlauth-backend.h"
+#include "imap-urlauth-fetch.h"
+#include "imap-urlauth-connection.h"
+
+#include "imap-urlauth-private.h"
+
+#include <time.h>
+
+#define IMAP_URLAUTH_MECH_INTERNAL_VERSION    0x01
+
+#define IMAP_URLAUTH_NORMAL_TIMEOUT_MSECS     5*1000
+#define IMAP_URLAUTH_SPECIAL_TIMEOUT_MSECS    3*60*1000
+
+#define URL_HOST_ALLOW_ANY "*"
+
+struct imap_urlauth_context *
+imap_urlauth_init(struct mail_user *user,
+		  const struct imap_urlauth_config *config)
+{
+	struct imap_urlauth_context *uctx;
+	unsigned int timeout;
+
+	i_assert(*config->url_host != '\0');
+
+	uctx = i_new(struct imap_urlauth_context, 1);
+	uctx->user = user;
+	uctx->url_host = i_strdup(config->url_host);
+	uctx->url_port = config->url_port;
+
+	if (config->access_anonymous)
+		uctx->access_user = i_strdup("anonymous");
+	else
+		uctx->access_user = i_strdup(config->access_user);
+	uctx->access_service = i_strdup(config->access_service);
+	uctx->access_anonymous = config->access_anonymous;
+	if (config->access_applications != NULL &&
+	    *config->access_applications != NULL) {
+		uctx->access_applications =
+			p_strarray_dup(default_pool,
+				       config->access_applications);
+		timeout = IMAP_URLAUTH_SPECIAL_TIMEOUT_MSECS;
+	} else {
+		timeout = IMAP_URLAUTH_NORMAL_TIMEOUT_MSECS;
+	}
+
+	if (config->socket_path != NULL) {
+		uctx->conn = imap_urlauth_connection_init(config->socket_path,
+					config->access_service, user, config->session_id, timeout);
+	}
+	return uctx;
+}
+
+void imap_urlauth_deinit(struct imap_urlauth_context **_uctx)
+{
+	struct imap_urlauth_context *uctx = *_uctx;
+
+	*_uctx = NULL;
+
+	if (uctx->conn != NULL)
+		imap_urlauth_connection_deinit(&uctx->conn);
+	i_free(uctx->url_host);
+	i_free(uctx->access_user);
+	i_free(uctx->access_service);
+	i_free(uctx->access_applications);
+	i_free(uctx);
+}
+
+static const unsigned char *
+imap_urlauth_internal_generate(const char *rumpurl,
+			       const unsigned char mailbox_key[IMAP_URLAUTH_KEY_LEN],
+			       size_t *token_len_r)
+{
+	struct hmac_context hmac;
+	unsigned char *token;
+
+	token = t_new(unsigned char, SHA1_RESULTLEN + 1);
+	token[0] = IMAP_URLAUTH_MECH_INTERNAL_VERSION;
+
+	hmac_init(&hmac, mailbox_key, IMAP_URLAUTH_KEY_LEN, &hash_method_sha1);
+	hmac_update(&hmac, rumpurl, strlen(rumpurl));
+	hmac_final(&hmac, token+1);
+
+	*token_len_r = SHA1_RESULTLEN + 1;
+	return token;
+}
+
+static bool
+imap_urlauth_internal_verify(const char *rumpurl,
+			     const unsigned char mailbox_key[IMAP_URLAUTH_KEY_LEN],
+			     const unsigned char *token, size_t token_len)
+{
+	const unsigned char *valtoken;
+	size_t valtoken_len;
+
+	if (rumpurl == NULL || token == NULL)
+		return FALSE;
+
+	valtoken = imap_urlauth_internal_generate(rumpurl, mailbox_key,
+						  &valtoken_len);
+	/* Note: the token length has timing leak here in any case */
+	if (token_len != valtoken_len)
+		return FALSE;
+
+	return mem_equals_timing_safe(token, valtoken, valtoken_len);
+}
+
+static bool
+access_applications_have_access(struct imap_urlauth_context *uctx,
+				struct imap_url *url, const char *const *access_applications)
+{
+	const char *const *application;
+
+	if (access_applications == NULL)
+		return FALSE;
+
+	application = access_applications;
+	for (; *application != NULL; application++) {
+		const char *app = *application;
+		bool have_userid = FALSE;
+		size_t len = strlen(app);
+
+		if (app[len-1] == '+')
+			have_userid = TRUE;
+
+		if (strncasecmp(url->uauth_access_application, app, len-1) == 0) {
+			if (!have_userid) {
+				/* this access application must have no userid */
+				return url->uauth_access_user == NULL;
+			}
+
+			/* this access application must have a userid */
+			return (!uctx->access_anonymous && url->uauth_access_user != NULL);
+		}
+	}
+	return FALSE;
+}
+
+static bool
+imap_urlauth_check_access(struct imap_urlauth_context *uctx,
+			  struct imap_url *url, bool ignore_unknown,
+			  const char **error_r)
+{
+	const char *userid;
+
+	if (url->uauth_access_application == NULL) {
+		*error_r = "URL is missing URLAUTH";
+		return FALSE;
+	}
+
+	if (strcmp(uctx->access_service, "imap") == 0) {
+		/* these access types are only allowed if URL is accessed through imap */
+		if (strcasecmp(url->uauth_access_application, "user") == 0) {
+			/* user+<access_user> */
+			if (url->uauth_access_user == NULL) {
+				*error_r = "URLAUTH `user' access is missing userid";
+				return FALSE;
+			}
+			if (!uctx->access_anonymous ||
+				  strcasecmp(url->uauth_access_user, uctx->access_user) == 0)
+				return TRUE;
+		} else if (strcasecmp(url->uauth_access_application, "authuser") == 0) {
+			/* authuser */
+			if (!uctx->access_anonymous)
+				return TRUE;
+		} else if (strcasecmp(url->uauth_access_application, "anonymous") == 0) {
+			/* anonymous */
+			return TRUE;
+		} else if (ignore_unknown || access_applications_have_access
+			(uctx, url, uctx->access_applications)) {
+			return TRUE;
+		}
+	} else if (strcmp(uctx->access_service, "submission") == 0) {
+		/* accessed directly through submission service */
+
+		if (strcasecmp(url->uauth_access_application, "submit") != 0) {
+			userid = url->uauth_access_user == NULL ? "" :
+				t_strdup_printf("+%s", url->uauth_access_user);
+			*error_r = t_strdup_printf(
+				"No '%s%s' access allowed for submission service",
+				url->uauth_access_application, userid);
+			return FALSE;
+		} else if (url->uauth_access_user == NULL) {
+			*error_r = "URLAUTH `submit' access is missing userid";
+			return FALSE;
+		} else if (!uctx->access_anonymous &&
+			strcasecmp(url->uauth_access_user, uctx->access_user) == 0) {
+			return TRUE;
+		}
+	}
+
+	userid = url->uauth_access_user == NULL ? "" :
+		t_strdup_printf("+%s", url->uauth_access_user);
+
+	if (uctx->access_anonymous) {
+		*error_r = t_strdup_printf(
+			"No '%s%s' access allowed for anonymous user",
+			url->uauth_access_application, userid);
+	} else {
+		*error_r = t_strdup_printf(
+			"No '%s%s' access allowed for user %s",
+			url->uauth_access_application, userid, uctx->access_user);
+	}
+	return FALSE;
+}
+
+static bool
+imap_urlauth_check_hostport(struct imap_urlauth_context *uctx,
+			    struct imap_url *url, const char **client_error_r)
+{
+	/* validate host */
+	/* FIXME: allow host ip/ip6 as well? */
+	if (strcmp(uctx->url_host, URL_HOST_ALLOW_ANY) != 0 &&
+	    strcmp(url->host.name, uctx->url_host) != 0) {
+		*client_error_r = "Invalid URL: Inappropriate host name";
+		return FALSE;
+	}
+
+	/* validate port */
+	if ((url->port == 0 && uctx->url_port != 143) ||
+	    (url->port != 0 && uctx->url_port != url->port)) {
+		*client_error_r = "Invalid URL: Inappropriate server port";
+		return FALSE;
+	}
+	return TRUE;
+}
+
+int imap_urlauth_generate(struct imap_urlauth_context *uctx,
+			  const char *mechanism, const char *rumpurl,
+			  const char **urlauth_r, const char **client_error_r)
+{
+	struct mail_user *user = uctx->user;
+	enum imap_url_parse_flags url_flags =
+		IMAP_URL_PARSE_ALLOW_URLAUTH;
+	struct imap_url *url;
+	struct imap_msgpart_url *mpurl = NULL;
+	struct mailbox *box;
+	const char *error;
+	enum mail_error error_code;
+	unsigned char mailbox_key[IMAP_URLAUTH_KEY_LEN];
+	const unsigned char *token;
+	size_t token_len;
+	int ret;
+
+	/* validate mechanism */
+	if (strcasecmp(mechanism, "INTERNAL") != 0) {
+		*client_error_r = t_strdup_printf("Unsupported URLAUTH mechanism: %s", mechanism);
+		return 0;
+	}
+
+	/* validate URL */
+	if (imap_url_parse(rumpurl, NULL, url_flags, &url, &error) < 0) {
+		*client_error_r = t_strdup_printf("Invalid URL: %s", error);
+		return 0;
+	}
+
+	if (url->mailbox == NULL || url->uid == 0 || url->search_program != NULL ||
+		url->uauth_rumpurl == NULL || url->uauth_mechanism != NULL) {
+		*client_error_r = "Invalid URL: Must be an URLAUTH rump URL";
+		return 0;
+	}
+
+	/* validate expiry time */
+	if (url->uauth_expire != (time_t)-1) {
+		time_t now = time(NULL);
+
+		if (now > url->uauth_expire) {
+			*client_error_r = t_strdup_printf("URLAUTH has already expired");
+			return 0;
+		}
+	}
+
+	/* validate user */
+	if (url->userid == NULL) {
+		*client_error_r = "Invalid URL: Missing user name";
+		return 0;
+	}
+	if (user->anonymous || strcmp(url->userid, user->username) != 0) {
+		*client_error_r = t_strdup_printf(
+			"Not permitted to generate URLAUTH for user %s",
+			url->userid);
+		return 0;
+	}
+
+	/* validate host:port */
+	if (!imap_urlauth_check_hostport(uctx, url, client_error_r))
+		return 0;
+
+	/* validate mailbox */
+	if ((ret = imap_msgpart_url_create(user, url, &mpurl, &error)) < 0 ||
+	    imap_msgpart_url_verify(mpurl, &error) <= 0) {
+		*client_error_r = t_strdup_printf("Invalid URL: %s", error);
+		if (mpurl != NULL)
+			imap_msgpart_url_free(&mpurl);
+		return ret;
+	}
+	box = imap_msgpart_url_get_mailbox(mpurl);
+
+	/* obtain mailbox key */
+	ret = imap_urlauth_backend_get_mailbox_key(box, TRUE, mailbox_key,
+						   client_error_r, &error_code);
+	if (ret < 0) {
+		imap_msgpart_url_free(&mpurl);
+		return ret;
+	}
+
+	token = imap_urlauth_internal_generate(rumpurl, mailbox_key, &token_len);
+	imap_msgpart_url_free(&mpurl);
+
+	*urlauth_r = imap_url_add_urlauth(rumpurl, mechanism, token, token_len);
+	return 1;
+}
+
+bool imap_urlauth_check(struct imap_urlauth_context *uctx,
+			struct imap_url *url, bool ignore_unknown_access,
+			const char **error_r)
+{
+	/* validate URL fields */
+	if (url->mailbox == NULL || url->uid == 0 ||
+	    url->search_program != NULL || url->uauth_rumpurl == NULL ||
+	    url->uauth_mechanism == NULL) {
+		*error_r = "Invalid URL: Must be a full URLAUTH URL";
+		return FALSE;
+	}
+
+	/* check presence of userid */
+	if (url->userid == NULL) {
+		*error_r = "Invalid URLAUTH: Missing user name";
+		return FALSE;
+	}
+
+	/* validate mechanism */
+	if (strcasecmp(url->uauth_mechanism, "INTERNAL") != 0) {
+		*error_r = t_strdup_printf("Unsupported URLAUTH mechanism: %s",
+					   url->uauth_mechanism);
+		return FALSE;
+	}
+
+	/* validate expiry time */
+	if (url->uauth_expire != (time_t)-1) {
+		time_t now = time(NULL);
+
+		if (now > url->uauth_expire) {
+			*error_r = t_strdup_printf("URLAUTH has expired");
+			return FALSE;
+		}
+	}
+
+	/* validate access */
+	if (!imap_urlauth_check_access(uctx, url, ignore_unknown_access,
+				       error_r))
+		return FALSE;
+	/* validate host:port */
+	if (!imap_urlauth_check_hostport(uctx, url, error_r))
+		return FALSE;
+	return TRUE;
+}
+
+int imap_urlauth_fetch_parsed(struct imap_urlauth_context *uctx,
+			      struct imap_url *url,
+			      struct imap_msgpart_url **mpurl_r,
+			      enum mail_error *error_code_r,
+			      const char **error_r)
+{
+	struct mail_user *user = uctx->user;
+	struct imap_msgpart_url *mpurl;
+	struct mailbox *box;
+	const char *error;
+	unsigned char mailbox_key[IMAP_URLAUTH_KEY_LEN];
+	int ret;
+
+	*mpurl_r = NULL;
+	*error_r = NULL;
+	*error_code_r = MAIL_ERROR_NONE;
+
+	/* check urlauth mechanism, access, userid and authority */
+	if (!imap_urlauth_check(uctx, url, FALSE, error_r)) {
+		*error_code_r = MAIL_ERROR_PARAMS;
+		return 0;
+	}
+
+	/* validate target user */
+	if (user->anonymous || strcmp(url->userid, user->username) != 0) {
+		*error_r = t_strdup_printf("Not permitted to fetch URLAUTH for user %s",
+					   url->userid);
+		*error_code_r = MAIL_ERROR_PARAMS;
+		return 0;
+	}
+
+	/* validate mailbox */
+	if ((ret = imap_msgpart_url_create(user, url, &mpurl, &error)) < 0) {
+		*error_r = t_strdup_printf("Invalid URLAUTH: %s", error);
+		*error_code_r = MAIL_ERROR_PARAMS;
+		return ret;
+	}
+
+	if ((ret = imap_msgpart_url_open_mailbox(mpurl, &box, error_code_r,
+						 &error)) < 0) {
+		*error_r = "Internal server error";
+		imap_msgpart_url_free(&mpurl);
+		return -1;
+	}
+
+	if (ret == 0) {
+		/* RFC says: `If the mailbox cannot be identified, an
+		   authorization token is calculated on the rump URL, using
+		   random "plausible" keys (selected by the server) as needed,
+		   before returning a validation failure. This prevents timing
+		   attacks aimed at identifying mailbox names.' */
+		random_fill(mailbox_key, sizeof(mailbox_key));
+		(void)imap_urlauth_internal_verify(url->uauth_rumpurl,
+			mailbox_key, url->uauth_token, url->uauth_token_size);
+
+		*error_r = t_strdup_printf("Invalid URLAUTH: %s", error);
+		imap_msgpart_url_free(&mpurl);
+		return 0;
+	}
+
+	/* obtain mailbox key */
+	ret = imap_urlauth_backend_get_mailbox_key(box, FALSE, mailbox_key,
+						   error_r, error_code_r);
+	if (ret < 0) {
+		imap_msgpart_url_free(&mpurl);
+		return -1;
+	}
+
+	if (ret == 0 ||
+	    !imap_urlauth_internal_verify(url->uauth_rumpurl, mailbox_key,
+					  url->uauth_token,
+					  url->uauth_token_size)) {
+		*error_r = "URLAUTH verification failed";
+		*error_code_r = MAIL_ERROR_PERM;
+		imap_msgpart_url_free(&mpurl);
+		ret = 0;
+	} else {
+		ret = 1;
+	}
+
+	safe_memset(mailbox_key, 0, sizeof(mailbox_key));
+	*mpurl_r = mpurl;
+	return ret;
+}
+
+int imap_urlauth_fetch(struct imap_urlauth_context *uctx,
+		       const char *urlauth, struct imap_msgpart_url **mpurl_r,
+		       enum mail_error *error_code_r, const char **error_r)
+{
+	struct imap_url *url;
+	enum imap_url_parse_flags url_flags = IMAP_URL_PARSE_ALLOW_URLAUTH;
+	const char *error;
+
+	/* validate URL */
+	if (imap_url_parse(urlauth, NULL, url_flags, &url, &error) < 0) {
+		*error_r = t_strdup_printf("Invalid URLAUTH: %s", error);
+		*error_code_r = MAIL_ERROR_PARAMS;
+		return 0;
+	}
+
+	return imap_urlauth_fetch_parsed(uctx, url, mpurl_r,
+					 error_code_r, error_r);
+}
+
+int imap_urlauth_reset_mailbox_key(struct imap_urlauth_context *uctx ATTR_UNUSED,
+				   struct mailbox *box)
+{
+	return imap_urlauth_backend_reset_mailbox_key(box);
+}
+
+int imap_urlauth_reset_all_keys(struct imap_urlauth_context *uctx)
+{
+	return imap_urlauth_backend_reset_all_keys(uctx->user);
+}
diff --git a/src/lib-imap-urlauth/imap-urlauth.h b/src/lib-imap-urlauth/imap-urlauth.h
new file mode 100644
index 0000000..9c7c30f
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth.h
@@ -0,0 +1,55 @@
+#ifndef IMAP_URLAUTH_H
+#define IMAP_URLAUTH_H
+
+#include "net.h"
+
+#define IMAP_URLAUTH_SOCKET_NAME "imap-urlauth"
+
+struct imap_url;
+struct imap_msgpart_url;
+struct imap_urlauth_context;
+
+struct imap_urlauth_config {
+	const char *url_host;
+	in_port_t url_port;
+
+	const char *socket_path;
+	const char *session_id;
+
+	/* the user who is requesting access to URLAUTHs */
+	const char *access_user;
+	/* ... is using this service (i.e. imap or submission) */
+	const char *access_service;
+	/* ... represents these applications */
+	const char *const *access_applications;
+	/* ... is anonymous? */
+	bool access_anonymous;
+};
+
+struct imap_urlauth_context *
+imap_urlauth_init(struct mail_user *user,
+		  const struct imap_urlauth_config *config);
+void imap_urlauth_deinit(struct imap_urlauth_context **_uctx);
+
+int imap_urlauth_generate(struct imap_urlauth_context *uctx,
+			  const char *mechanism, const char *rumpurl,
+			  const char **urlauth_r, const char **client_error_r);
+
+bool imap_urlauth_check(struct imap_urlauth_context *uctx,
+			struct imap_url *url, bool ignore_unknown_access,
+			const char **error_r);
+
+int imap_urlauth_fetch_parsed(struct imap_urlauth_context *uctx,
+			      struct imap_url *url,
+			      struct imap_msgpart_url **mpurl_r,
+			      enum mail_error *error_code_r,
+			      const char **error_r);
+int imap_urlauth_fetch(struct imap_urlauth_context *uctx,
+		       const char *urlauth, struct imap_msgpart_url **mpurl_r,
+		       enum mail_error *error_code_r, const char **error_r);
+
+int imap_urlauth_reset_mailbox_key(struct imap_urlauth_context *uctx,
+				   struct mailbox *box);
+int imap_urlauth_reset_all_keys(struct imap_urlauth_context *uctx);
+
+#endif
diff --git a/src/lib-imap/Makefile.am b/src/lib-imap/Makefile.am
new file mode 100644
index 0000000..2f59f93
--- /dev/null
+++ b/src/lib-imap/Makefile.am
@@ -0,0 +1,120 @@
+noinst_LTLIBRARIES = libimap.la
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib \
+	-I$(top_srcdir)/src/lib-test \
+	-I$(top_srcdir)/src/lib-charset \
+	-I$(top_srcdir)/src/lib-mail
+
+libimap_la_SOURCES = \
+	imap-arg.c \
+	imap-base-subject.c \
+	imap-bodystructure.c \
+	imap-date.c \
+	imap-envelope.c \
+	imap-id.c \
+	imap-keepalive.c \
+	imap-match.c \
+	imap-parser.c \
+	imap-quote.c \
+	imap-url.c \
+	imap-seqset.c \
+	imap-utf7.c \
+	imap-util.c
+
+headers = \
+	imap-arg.h \
+	imap-base-subject.h \
+	imap-bodystructure.h \
+	imap-date.h \
+	imap-envelope.h \
+	imap-id.h \
+	imap-keepalive.h \
+	imap-match.h \
+	imap-parser.h \
+	imap-resp-code.h \
+	imap-quote.h \
+	imap-url.h \
+	imap-seqset.h \
+	imap-utf7.h \
+	imap-util.h
+
+pkginc_libdir=$(pkgincludedir)
+pkginc_lib_HEADERS = $(headers)
+
+test_programs = \
+	test-imap-bodystructure \
+	test-imap-envelope \
+	test-imap-match \
+	test-imap-parser \
+	test-imap-quote \
+	test-imap-url \
+	test-imap-utf7 \
+	test-imap-util
+
+noinst_PROGRAMS = $(test_programs)
+
+test_libs = \
+	../lib-test/libtest.la \
+	../lib/liblib.la
+
+test_deps = $(noinst_LTLIBRARIES) $(test_libs)
+
+test_imap_bodystructure_SOURCES = test-imap-bodystructure.c
+test_imap_bodystructure_LDADD = imap-bodystructure.lo imap-envelope.lo imap-quote.lo imap-parser.lo imap-arg.lo ../lib-mail/libmail.la $(test_libs)
+test_imap_bodystructure_DEPENDENCIES = $(test_deps) ../lib-mail/libmail.la
+
+test_imap_envelope_SOURCES = test-imap-envelope.c
+test_imap_envelope_LDADD = imap-envelope.lo imap-quote.lo imap-parser.lo imap-arg.lo ../lib-mail/libmail.la $(test_libs)
+test_imap_envelope_DEPENDENCIES = $(test_deps) ../lib-mail/libmail.la
+
+test_imap_match_SOURCES = test-imap-match.c
+test_imap_match_LDADD = imap-match.lo $(test_libs)
+test_imap_match_DEPENDENCIES = $(test_deps)
+
+test_imap_parser_SOURCES = test-imap-parser.c
+test_imap_parser_LDADD = imap-parser.lo imap-arg.lo $(test_libs)
+test_imap_parser_DEPENDENCIES = $(test_deps)
+
+test_imap_quote_SOURCES = test-imap-quote.c
+test_imap_quote_LDADD = imap-quote.lo $(test_libs)
+test_imap_quote_DEPENDENCIES = $(test_deps)
+
+test_imap_url_SOURCES = test-imap-url.c
+test_imap_url_LDADD = imap-url.lo  $(test_libs)
+test_imap_url_DEPENDENCIES = $(test_deps)
+
+test_imap_utf7_SOURCES = test-imap-utf7.c
+test_imap_utf7_LDADD = imap-utf7.lo $(test_libs)
+test_imap_utf7_DEPENDENCIES = $(test_deps)
+
+test_imap_util_SOURCES = test-imap-util.c
+test_imap_util_LDADD = imap-util.lo imap-arg.lo $(test_libs)
+test_imap_util_DEPENDENCIES = $(test_deps)
+
+check-local:
+	for bin in $(test_programs); do \
+	  if ! $(RUN_TEST) ./$$bin; then exit 1; fi; \
+	done
+
+if USE_FUZZER
+noinst_PROGRAMS += \
+	fuzz-imap-utf7 \
+	fuzz-imap-bodystructure
+
+nodist_EXTRA_fuzz_imap_utf7_SOURCES = force-cxx-linking.cxx
+fuzz_imap_utf7_SOURCES = fuzz-imap-utf7.c
+fuzz_imap_utf7_CPPFLAGS = $(FUZZER_CPPFLAGS)
+fuzz_imap_utf7_LDFLAGS = $(FUZZER_LDFLAGS)
+fuzz_imap_utf7_LDADD = libimap.la $(test_libs)
+fuzz_imap_utf7_DEPENDENCIES = libimap.la $(test_deps)
+
+nodist_EXTRA_fuzz_imap_bodystructure_SOURCES = force-cxx-linking.cxx
+fuzz_imap_bodystructure_SOURCES = fuzz-imap-bodystructure.c
+fuzz_imap_bodystructure_CPPFLAGS = $(FUZZER_CPPFLAGS)
+fuzz_imap_bodystructure_LDFLAGS = $(FUZZER_LDFLAGS)
+fuzz_imap_bodystructure_LDADD = libimap.la $(test_libs)
+fuzz_imap_bodystructure_DEPENDENCIES = libimap.la $(test_deps)
+
+
+endif
diff --git a/src/lib-imap/Makefile.in b/src/lib-imap/Makefile.in
new file mode 100644
index 0000000..5fd6ea4
--- /dev/null
+++ b/src/lib-imap/Makefile.in
@@ -0,0 +1,1196 @@
+# Makefile.in generated by automake 1.16.1 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2018 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+
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+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
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+  for flg in $$sane_makeflags; do \
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+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
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+      *$$target_option*) has_opt=yes; break;; \
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+  test $$has_opt = yes
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+PRE_INSTALL = :
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+@USE_FUZZER_TRUE@	fuzz-imap-utf7 \
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+
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+	test-imap-envelope$(EXEEXT) test-imap-match$(EXEEXT) \
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+@USE_FUZZER_TRUE@	fuzz-imap-bodystructure$(EXEEXT)
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+	-I$(top_srcdir)/src/lib \
+	-I$(top_srcdir)/src/lib-test \
+	-I$(top_srcdir)/src/lib-charset \
+	-I$(top_srcdir)/src/lib-mail
+
+libimap_la_SOURCES = \
+	imap-arg.c \
+	imap-base-subject.c \
+	imap-bodystructure.c \
+	imap-date.c \
+	imap-envelope.c \
+	imap-id.c \
+	imap-keepalive.c \
+	imap-match.c \
+	imap-parser.c \
+	imap-quote.c \
+	imap-url.c \
+	imap-seqset.c \
+	imap-utf7.c \
+	imap-util.c
+
+headers = \
+	imap-arg.h \
+	imap-base-subject.h \
+	imap-bodystructure.h \
+	imap-date.h \
+	imap-envelope.h \
+	imap-id.h \
+	imap-keepalive.h \
+	imap-match.h \
+	imap-parser.h \
+	imap-resp-code.h \
+	imap-quote.h \
+	imap-url.h \
+	imap-seqset.h \
+	imap-utf7.h \
+	imap-util.h
+
+pkginc_libdir = $(pkgincludedir)
+pkginc_lib_HEADERS = $(headers)
+test_programs = \
+	test-imap-bodystructure \
+	test-imap-envelope \
+	test-imap-match \
+	test-imap-parser \
+	test-imap-quote \
+	test-imap-url \
+	test-imap-utf7 \
+	test-imap-util
+
+test_libs = \
+	../lib-test/libtest.la \
+	../lib/liblib.la
+
+test_deps = $(noinst_LTLIBRARIES) $(test_libs)
+test_imap_bodystructure_SOURCES = test-imap-bodystructure.c
+test_imap_bodystructure_LDADD = imap-bodystructure.lo imap-envelope.lo imap-quote.lo imap-parser.lo imap-arg.lo ../lib-mail/libmail.la $(test_libs)
+test_imap_bodystructure_DEPENDENCIES = $(test_deps) ../lib-mail/libmail.la
+test_imap_envelope_SOURCES = test-imap-envelope.c
+test_imap_envelope_LDADD = imap-envelope.lo imap-quote.lo imap-parser.lo imap-arg.lo ../lib-mail/libmail.la $(test_libs)
+test_imap_envelope_DEPENDENCIES = $(test_deps) ../lib-mail/libmail.la
+test_imap_match_SOURCES = test-imap-match.c
+test_imap_match_LDADD = imap-match.lo $(test_libs)
+test_imap_match_DEPENDENCIES = $(test_deps)
+test_imap_parser_SOURCES = test-imap-parser.c
+test_imap_parser_LDADD = imap-parser.lo imap-arg.lo $(test_libs)
+test_imap_parser_DEPENDENCIES = $(test_deps)
+test_imap_quote_SOURCES = test-imap-quote.c
+test_imap_quote_LDADD = imap-quote.lo $(test_libs)
+test_imap_quote_DEPENDENCIES = $(test_deps)
+test_imap_url_SOURCES = test-imap-url.c
+test_imap_url_LDADD = imap-url.lo  $(test_libs)
+test_imap_url_DEPENDENCIES = $(test_deps)
+test_imap_utf7_SOURCES = test-imap-utf7.c
+test_imap_utf7_LDADD = imap-utf7.lo $(test_libs)
+test_imap_utf7_DEPENDENCIES = $(test_deps)
+test_imap_util_SOURCES = test-imap-util.c
+test_imap_util_LDADD = imap-util.lo imap-arg.lo $(test_libs)
+test_imap_util_DEPENDENCIES = $(test_deps)
+@USE_FUZZER_TRUE@nodist_EXTRA_fuzz_imap_utf7_SOURCES = force-cxx-linking.cxx
+@USE_FUZZER_TRUE@fuzz_imap_utf7_SOURCES = fuzz-imap-utf7.c
+@USE_FUZZER_TRUE@fuzz_imap_utf7_CPPFLAGS = $(FUZZER_CPPFLAGS)
+@USE_FUZZER_TRUE@fuzz_imap_utf7_LDFLAGS = $(FUZZER_LDFLAGS)
+@USE_FUZZER_TRUE@fuzz_imap_utf7_LDADD = libimap.la $(test_libs)
+@USE_FUZZER_TRUE@fuzz_imap_utf7_DEPENDENCIES = libimap.la $(test_deps)
+@USE_FUZZER_TRUE@nodist_EXTRA_fuzz_imap_bodystructure_SOURCES = force-cxx-linking.cxx
+@USE_FUZZER_TRUE@fuzz_imap_bodystructure_SOURCES = fuzz-imap-bodystructure.c
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+fuzz_imap_utf7-force-cxx-linking.obj: force-cxx-linking.cxx
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+	  if test -f "$$i"; then \
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+	    fi; \
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+	done
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	fi
+mostlyclean-generic:
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+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
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+	clean-noinstPROGRAMS mostlyclean-am
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+distclean: distclean-am
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+	uninstall-pkginc_libHEADERS
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+
+
+check-local:
+	for bin in $(test_programs); do \
+	  if ! $(RUN_TEST) ./$$bin; then exit 1; fi; \
+	done
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib-imap/fuzz-imap-bodystructure.c b/src/lib-imap/fuzz-imap-bodystructure.c
new file mode 100644
index 0000000..a9d4499
--- /dev/null
+++ b/src/lib-imap/fuzz-imap-bodystructure.c
@@ -0,0 +1,52 @@
+/* Copyright (c) 2020 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "str.h"
+#include "fuzzer.h"
+#include "imap-bodystructure.c"
+#include <ctype.h>
+
+static const char *str_sanitize_binary(const char *input)
+{
+	string_t *dest = t_str_new(strlen(input));
+	for (;*input != '\0';input++) {
+		if (i_isprint(*input) == 0)
+			str_printfa(dest, "<%02x>", (unsigned char)*input);
+		else
+			str_append_c(dest, *input);
+	}
+	return str_c(dest);
+}
+
+FUZZ_BEGIN_STR(const char *str)
+{
+	pool_t pool =
+		pool_alloconly_create(MEMPOOL_GROWING"fuzz bodystructure", 1024);
+	struct message_part parts;
+	string_t *dest = str_new(pool, 32);
+	const char *error ATTR_UNUSED;
+	i_zero(&parts);
+
+	if (imap_bodystructure_parse(str, pool, &parts, &error) == 0) {
+		if (imap_bodystructure_write(&parts, dest, TRUE, &error) < 0)
+			i_panic("Failed to write bodystructure: %s", error);
+		/* The written bodystructure must be parseable *and*
+		   it must come out exactly the same again */
+		if (imap_bodystructure_parse(str_c(dest), pool, &parts, &error) != 0) {
+			i_panic("Failed to reparse bodystructure '%s'",
+				str_sanitize_binary(str_c(dest)));
+		} else {
+			const char *new_str = t_strdup(str_c(dest));
+			str_truncate(dest, 0);
+			if (imap_bodystructure_write(&parts, dest, TRUE, &error) < 0)
+				i_panic("Failed to write reparsed bodystructure: %s", error);
+			if (strcmp(str_c(dest), new_str) != 0) {
+				i_panic("Parsed bodystructure '%s' does not match '%s'",
+					str_sanitize_binary(new_str),
+					str_sanitize_binary(str_c(dest)));
+			}
+		}
+	}
+	pool_unref(&pool);
+}
+FUZZ_END
diff --git a/src/lib-imap/fuzz-imap-utf7.c b/src/lib-imap/fuzz-imap-utf7.c
new file mode 100644
index 0000000..2a561f1
--- /dev/null
+++ b/src/lib-imap/fuzz-imap-utf7.c
@@ -0,0 +1,15 @@
+/* Copyright (c) 2020 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "str.h"
+#include "fuzzer.h"
+#include "imap-utf7.h"
+
+FUZZ_BEGIN_STR(const char *str)
+{
+	string_t *dest = t_str_new(32);
+
+	imap_utf8_to_utf7(str, dest);
+	imap_utf7_to_utf8(str, dest);
+}
+FUZZ_END
diff --git a/src/lib-imap/imap-arg.c b/src/lib-imap/imap-arg.c
new file mode 100644
index 0000000..0b947ce
--- /dev/null
+++ b/src/lib-imap/imap-arg.c
@@ -0,0 +1,137 @@
+/* Copyright (c) 2010-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "imap-arg.h"
+
+bool imap_arg_get_atom(const struct imap_arg *arg, const char **str_r)
+{
+	if (arg->type != IMAP_ARG_ATOM && arg->type != IMAP_ARG_NIL)
+		return FALSE;
+
+	*str_r = arg->_data.str;
+	return TRUE;
+}
+
+bool imap_arg_get_quoted(const struct imap_arg *arg, const char **str_r)
+{
+	if (arg->type != IMAP_ARG_STRING)
+		return FALSE;
+
+	*str_r = arg->_data.str;
+	return TRUE;
+}
+
+bool imap_arg_get_string(const struct imap_arg *arg, const char **str_r)
+{
+	if (arg->type != IMAP_ARG_STRING && arg->type != IMAP_ARG_LITERAL)
+		return FALSE;
+
+	*str_r = arg->_data.str;
+	return TRUE;
+}
+
+bool imap_arg_get_astring(const struct imap_arg *arg, const char **str_r)
+{
+	/* RFC 3501 4.5. specifies that NIL is the same as "NIL" when
+	   reading astring. */
+	if (!IMAP_ARG_IS_ASTRING(arg) && arg->type != IMAP_ARG_NIL)
+		return FALSE;
+
+	*str_r = arg->_data.str;
+	return TRUE;
+}
+
+bool imap_arg_get_nstring(const struct imap_arg *arg, const char **str_r)
+{
+	if (arg->type == IMAP_ARG_NIL) {
+		*str_r = NULL;
+		return TRUE;
+	}
+	return imap_arg_get_string(arg, str_r);
+}
+
+bool imap_arg_get_literal_size(const struct imap_arg *arg, uoff_t *size_r)
+{
+	if (arg->type != IMAP_ARG_LITERAL_SIZE &&
+	    arg->type != IMAP_ARG_LITERAL_SIZE_NONSYNC)
+		return FALSE;
+
+	*size_r = arg->_data.literal_size;
+	return TRUE;
+}
+
+bool imap_arg_get_list(const struct imap_arg *arg,
+		       const struct imap_arg **list_r)
+{
+	unsigned int count;
+
+	return imap_arg_get_list_full(arg, list_r, &count);
+}
+
+bool imap_arg_get_list_full(const struct imap_arg *arg,
+			    const struct imap_arg **list_r,
+			    unsigned int *list_count_r)
+{
+	unsigned int count;
+
+	if (arg->type != IMAP_ARG_LIST)
+		return FALSE;
+
+	*list_r = array_get(&arg->_data.list, &count);
+
+	if (count > 0 && (*list_r)[count-1].type == IMAP_ARG_EOL)
+		count--;
+	else {
+		/* imap-parser stopped early (e.g. due to reading literal size).
+		   The IMAP_ARG_EOL was added to the list only temporarily. */
+		i_assert((*list_r)[count].type == IMAP_ARG_EOL);
+	}
+	*list_count_r = count;
+	return TRUE;
+}
+
+const char *imap_arg_as_astring(const struct imap_arg *arg)
+{
+	const char *str;
+
+	if (!imap_arg_get_astring(arg, &str))
+		i_unreached();
+	return str;
+}
+
+const char *imap_arg_as_nstring(const struct imap_arg *arg)
+{
+	const char *str;
+
+	if (!imap_arg_get_nstring(arg, &str))
+		i_unreached();
+	return str;
+}
+
+uoff_t imap_arg_as_literal_size(const struct imap_arg *arg)
+{
+	uoff_t size;
+
+	if (!imap_arg_get_literal_size(arg, &size))
+		i_unreached();
+	return size;
+}
+
+const struct imap_arg *
+imap_arg_as_list(const struct imap_arg *arg)
+{
+	const struct imap_arg *ret;
+
+	if (!imap_arg_get_list(arg, &ret))
+		i_unreached();
+	return ret;
+}
+
+bool imap_arg_atom_equals(const struct imap_arg *arg, const char *str)
+{
+	const char *value;
+
+	if (!imap_arg_get_atom(arg, &value))
+		return FALSE;
+	return strcasecmp(value, str) == 0;
+}
diff --git a/src/lib-imap/imap-arg.h b/src/lib-imap/imap-arg.h
new file mode 100644
index 0000000..d55ee15
--- /dev/null
+++ b/src/lib-imap/imap-arg.h
@@ -0,0 +1,108 @@
+#ifndef IMAP_ARG_H
+#define IMAP_ARG_H
+
+#include "array.h"
+
+/* ABNF:
+
+   CHAR           =  %x01-7F
+   CTL            =  %x00-1F / %x7F
+   SP             =  %x20
+   DQUOTE         =  %x22 */
+
+/* ASTRING-CHAR   = ATOM-CHAR / resp-specials */
+#define IS_ASTRING_CHAR(c) (IS_ATOM_CHAR(c) || IS_RESP_SPECIAL(c))
+/* ATOM-CHAR       = <any CHAR except atom-specials> */
+#define IS_ATOM_CHAR(c) (!IS_ATOM_SPECIAL(c))
+/* atom-specials   = "(" / ")" / "{" / SP / CTL / list-wildcards /
+                     quoted-specials / resp-specials
+   Since atoms are only 7bit, we'll also optimize a bit by assuming 8bit chars
+   are also atom-specials. */
+#define IS_ATOM_SPECIAL(c) \
+	((unsigned char)(c) <= 0x20 || (unsigned char)(c) >= 0x7f || \
+	 (c) == '(' || (c) == ')' || (c) == '{' || IS_LIST_WILDCARD(c) || \
+	 IS_QUOTED_SPECIAL(c) || IS_RESP_SPECIAL(c))
+
+/* list-wildcards  = "%" / "*" */
+#define IS_LIST_WILDCARD(c) ((c) == '%' || (c) == '*')
+/* quoted-specials = DQUOTE / "\" */
+#define IS_QUOTED_SPECIAL(c) ((c) == '\"' || (c) == '\\')
+/* resp-specials   = "]" */
+#define IS_RESP_SPECIAL(c) ((c) == ']')
+
+enum imap_arg_type {
+	IMAP_ARG_NIL = 0,
+	IMAP_ARG_ATOM,
+	IMAP_ARG_STRING,
+	IMAP_ARG_LIST,
+
+	/* literals are returned as IMAP_ARG_STRING by default */
+	IMAP_ARG_LITERAL,
+	IMAP_ARG_LITERAL_SIZE,
+	IMAP_ARG_LITERAL_SIZE_NONSYNC,
+
+	IMAP_ARG_EOL /* end of argument list */
+};
+
+ARRAY_DEFINE_TYPE(imap_arg_list, struct imap_arg);
+struct imap_arg {
+	enum imap_arg_type type;
+        struct imap_arg *parent; /* always of type IMAP_ARG_LIST */
+
+	/* Set when _data.str is set */
+	size_t str_len;
+
+	union {
+		const char *str;
+		uoff_t literal_size;
+		ARRAY_TYPE(imap_arg_list) list;
+	} _data;
+	bool literal8:1; /* BINARY literal8 used */
+};
+
+/* RFC 3501's astring type. Note that this doesn't return TRUE for
+   IMAP_ARG_NIL, although it should be treated the same as "NIL" string when
+   reading an astring. */
+#define IMAP_ARG_TYPE_IS_ASTRING(type) \
+	((type) == IMAP_ARG_ATOM || \
+	 (type) == IMAP_ARG_STRING || \
+	 (type) == IMAP_ARG_LITERAL)
+#define IMAP_ARG_IS_ASTRING(arg) \
+	IMAP_ARG_TYPE_IS_ASTRING((arg)->type)
+#define IMAP_ARG_IS_NSTRING(arg) \
+	(IMAP_ARG_IS_ASTRING(arg) || (arg)->type == IMAP_ARG_NIL)
+#define IMAP_ARG_IS_EOL(arg) \
+	((arg)->type == IMAP_ARG_EOL)
+
+bool imap_arg_get_atom(const struct imap_arg *arg, const char **str_r)
+	ATTR_WARN_UNUSED_RESULT;
+bool imap_arg_get_quoted(const struct imap_arg *arg, const char **str_r)
+	ATTR_WARN_UNUSED_RESULT;
+bool imap_arg_get_string(const struct imap_arg *arg, const char **str_r)
+	ATTR_WARN_UNUSED_RESULT;
+bool imap_arg_get_astring(const struct imap_arg *arg, const char **str_r)
+	ATTR_WARN_UNUSED_RESULT;
+/* str is set to NULL for NIL. */
+bool imap_arg_get_nstring(const struct imap_arg *arg, const char **str_r)
+	ATTR_WARN_UNUSED_RESULT;
+
+bool imap_arg_get_literal_size(const struct imap_arg *arg, uoff_t *size_r)
+	ATTR_WARN_UNUSED_RESULT;
+
+bool imap_arg_get_list(const struct imap_arg *arg,
+		       const struct imap_arg **list_r)
+	ATTR_WARN_UNUSED_RESULT;
+bool imap_arg_get_list_full(const struct imap_arg *arg,
+			    const struct imap_arg **list_r,
+			    unsigned int *list_count_r) ATTR_WARN_UNUSED_RESULT;
+
+/* Similar to above, but assumes that arg is already of correct type. */
+const char *imap_arg_as_astring(const struct imap_arg *arg);
+const char *imap_arg_as_nstring(const struct imap_arg *arg);
+uoff_t imap_arg_as_literal_size(const struct imap_arg *arg);
+const struct imap_arg *imap_arg_as_list(const struct imap_arg *arg);
+
+/* Returns TRUE if arg is atom and case-insensitively matches str */
+bool imap_arg_atom_equals(const struct imap_arg *arg, const char *str);
+
+#endif
diff --git a/src/lib-imap/imap-base-subject.c b/src/lib-imap/imap-base-subject.c
new file mode 100644
index 0000000..02469d3
--- /dev/null
+++ b/src/lib-imap/imap-base-subject.c
@@ -0,0 +1,248 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+/* Implemented against draft-ietf-imapext-sort-10 and
+   draft-ietf-imapext-thread-12 */
+
+#include "lib.h"
+#include "buffer.h"
+#include "charset-utf8.h"
+#include "message-header-decode.h"
+#include "imap-base-subject.h"
+
+static void pack_whitespace(buffer_t *buf)
+{
+	char *data, *dest;
+	bool last_lwsp;
+
+	data = buffer_get_modifiable_data(buf, NULL);
+
+	/* check if we need to do anything */
+	while (*data != '\0') {
+		if (*data == '\t' || *data == '\n' || *data == '\r' ||
+		    (*data == ' ' && (data[1] == ' ' || data[1] == '\t')))
+			break;
+		data++;
+	}
+
+	if (*data == '\0')
+		return;
+
+	/* @UNSAFE: convert/pack the whitespace */
+	dest = data; last_lwsp = FALSE;
+	while (*data != '\0') {
+		if (*data == '\t' || *data == ' ' ||
+		    *data == '\r' || *data == '\n') {
+			if (!last_lwsp) {
+				*dest++ = ' ';
+				last_lwsp = TRUE;
+			}
+		} else {
+			*dest++ = *data;
+			last_lwsp = FALSE;
+		}
+		data++;
+	}
+	*dest = '\0';
+
+	data = buffer_get_modifiable_data(buf, NULL);
+	buffer_set_used_size(buf, (size_t) (dest - data)+1);
+}
+
+static void remove_subj_trailers(buffer_t *buf, size_t start_pos,
+				 bool *is_reply_or_forward_r)
+{
+	const char *data;
+	size_t orig_size, size;
+
+	/* subj-trailer    = "(fwd)" / WSP */
+	data = buffer_get_data(buf, &orig_size);
+
+	if (orig_size < 1) /* size includes trailing \0 */
+		return;
+
+	for (size = orig_size-1; size > start_pos; ) {
+		if (data[size-1] == ' ')
+			size--;
+		else if (size >= 5 &&
+			 memcmp(data + size - 5, "(FWD)", 5) == 0) {
+			*is_reply_or_forward_r = TRUE;
+			size -= 5;
+		} else {
+			break;
+		}
+	}
+
+	if (size != orig_size-1) {
+		buffer_set_used_size(buf, size);
+		buffer_append_c(buf, '\0');
+	}
+}
+
+static bool remove_blob(const char **datap)
+{
+	const char *data = *datap;
+
+	if (*data != '[')
+		return FALSE;
+
+	data++;
+	while (*data != '\0' && *data != '[' && *data != ']')
+		data++;
+
+	if (*data != ']')
+		return FALSE;
+
+	data++;
+	if (*data == ' ')
+		data++;
+
+	*datap = data;
+	return TRUE;
+}
+
+static bool remove_subj_leader(buffer_t *buf, size_t *start_pos,
+			       bool *is_reply_or_forward_r)
+{
+	const char *data, *orig_data;
+	bool ret = FALSE;
+
+	/* subj-leader     = (*subj-blob subj-refwd) / WSP
+
+	   subj-blob       = "[" *BLOBCHAR "]" *WSP
+	   subj-refwd      = ("re" / ("fw" ["d"])) *WSP [subj-blob] ":"
+
+	   BLOBCHAR        = %x01-5a / %x5c / %x5e-7f
+	                   ; any CHAR except '[' and ']' */
+	orig_data = buf->data;
+	orig_data += *start_pos;
+	data = orig_data;
+
+	if (*data == ' ') {
+		/* independent from checks below - always removed */
+		data++; orig_data++;
+		*start_pos += 1;
+		ret = TRUE;
+	}
+
+	while (*data == '[') {
+		if (!remove_blob(&data))
+			return ret;
+	}
+
+	if (str_begins(data, "RE"))
+		data += 2;
+	else if (str_begins(data, "FWD"))
+		data += 3;
+	else if (str_begins(data, "FW"))
+		data += 2;
+	else
+		return ret;
+
+	if (*data == ' ')
+		data++;
+
+	if (*data == '[' && !remove_blob(&data))
+		return ret;
+
+	if (*data != ':')
+		return ret;
+
+	data++;
+	*start_pos += (size_t)(data - orig_data);
+	*is_reply_or_forward_r = TRUE;
+	return TRUE;
+}
+
+static bool remove_blob_when_nonempty(buffer_t *buf, size_t *start_pos)
+{
+	const char *data, *orig_data;
+
+	orig_data = buf->data;
+	orig_data += *start_pos;
+	data = orig_data;
+	if (*data == '[' && remove_blob(&data) && *data != '\0') {
+		*start_pos += (size_t)(data - orig_data);
+		return TRUE;
+	}
+
+	return FALSE;
+}
+
+static bool remove_subj_fwd_hdr(buffer_t *buf, size_t *start_pos,
+				bool *is_reply_or_forward_r)
+{
+	const char *data = buf->data;
+	size_t size = buf->used;
+
+	/* subj-fwd        = subj-fwd-hdr subject subj-fwd-trl
+	   subj-fwd-hdr    = "[fwd:"
+	   subj-fwd-trl    = "]" */
+
+	if (!str_begins(data + *start_pos, "[FWD:"))
+		return FALSE;
+
+	if (data[size-2] != ']')
+		return FALSE;
+
+	*is_reply_or_forward_r = TRUE;
+
+	buffer_set_used_size(buf, size-2);
+	buffer_append_c(buf, '\0');
+
+	*start_pos += 5;
+	return TRUE;
+}
+
+const char *imap_get_base_subject_cased(pool_t pool, const char *subject,
+					bool *is_reply_or_forward_r)
+{
+	buffer_t *buf;
+	size_t start_pos, subject_len;
+	bool found;
+
+	*is_reply_or_forward_r = FALSE;
+
+	subject_len = strlen(subject);
+	buf = buffer_create_dynamic(pool, subject_len);
+
+	/* (1) Convert any RFC 2047 encoded-words in the subject to
+	   UTF-8.  Convert all tabs and continuations to space.
+	   Convert all multiple spaces to a single space. */
+	message_header_decode_utf8((const unsigned char *)subject, subject_len,
+				   buf, uni_utf8_to_decomposed_titlecase);
+	buffer_append_c(buf, '\0');
+
+	pack_whitespace(buf);
+
+	start_pos = 0;
+	do {
+		/* (2) Remove all trailing text of the subject that matches
+		   the subj-trailer ABNF, repeat until no more matches are
+		   possible. */
+		remove_subj_trailers(buf, start_pos, is_reply_or_forward_r);
+
+		do {
+			/* (3) Remove all prefix text of the subject that
+			   matches the subj-leader ABNF. */
+			found = remove_subj_leader(buf, &start_pos,
+						   is_reply_or_forward_r);
+
+			/* (4) If there is prefix text of the subject that
+			   matches the subj-blob ABNF, and removing that prefix
+			   leaves a non-empty subj-base, then remove the prefix
+			   text. */
+			found = remove_blob_when_nonempty(buf, &start_pos) ||
+				found;
+
+			/* (5) Repeat (3) and (4) until no matches remain. */
+		} while (found);
+
+		/* (6) If the resulting text begins with the subj-fwd-hdr ABNF
+		   and ends with the subj-fwd-trl ABNF, remove the
+		   subj-fwd-hdr and subj-fwd-trl and repeat from step (2). */
+	} while (remove_subj_fwd_hdr(buf, &start_pos, is_reply_or_forward_r));
+
+	/* (7) The resulting text is the "base subject" used in the
+	   SORT. */
+	return (const char *)buf->data + start_pos;
+}
diff --git a/src/lib-imap/imap-base-subject.h b/src/lib-imap/imap-base-subject.h
new file mode 100644
index 0000000..f086284
--- /dev/null
+++ b/src/lib-imap/imap-base-subject.h
@@ -0,0 +1,13 @@
+#ifndef IMAP_BASE_SUBJECT_H
+#define IMAP_BASE_SUBJECT_H
+
+/* Returns the base subject of the given string, according to
+   draft-ietf-imapext-sort-10. String is returned so that it's suitable for
+   strcmp() comparing with another base subject.
+
+   is_reply_or_forward is set to TRUE if message looks like reply or forward,
+   according to draft-ietf-imapext-thread-12 rules. */
+const char *imap_get_base_subject_cased(pool_t pool, const char *subject,
+					bool *is_reply_or_forward_r);
+
+#endif
diff --git a/src/lib-imap/imap-bodystructure.c b/src/lib-imap/imap-bodystructure.c
new file mode 100644
index 0000000..522c250
--- /dev/null
+++ b/src/lib-imap/imap-bodystructure.c
@@ -0,0 +1,956 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "buffer.h"
+#include "istream.h"
+#include "str.h"
+#include "message-part-data.h"
+#include "message-parser.h"
+#include "rfc822-parser.h"
+#include "rfc2231-parser.h"
+#include "imap-parser.h"
+#include "imap-quote.h"
+#include "imap-envelope.h"
+#include "imap-bodystructure.h"
+
+#define EMPTY_BODY "(\"text\" \"plain\" " \
+	"(\"charset\" \""MESSAGE_PART_DEFAULT_CHARSET"\") NIL NIL \"7bit\" 0 0)"
+#define EMPTY_BODYSTRUCTURE "(\"text\" \"plain\" " \
+	"(\"charset\" \""MESSAGE_PART_DEFAULT_CHARSET"\") NIL NIL \"7bit\" 0 0 " \
+		"NIL NIL NIL NIL)"
+
+/*
+ * IMAP BODY/BODYSTRUCTURE write
+ */
+
+static void
+params_write(const struct message_part_param *params,
+	unsigned int params_count, string_t *str,
+	bool default_charset)
+{
+	unsigned int i;
+	bool seen_charset;
+
+	if (!default_charset && params_count == 0) {
+		str_append(str, "NIL");
+		return;
+	}
+	str_append_c(str, '(');
+
+	seen_charset = FALSE;
+	for (i = 0; i < params_count; i++) {
+		i_assert(params[i].name != NULL);
+		i_assert(params[i].value != NULL);
+
+		if (i > 0)
+			str_append_c(str, ' ');
+		if (default_charset &&
+			strcasecmp(params[i].name, "charset") == 0)
+			seen_charset = TRUE;
+		imap_append_string(str, params[i].name);
+		str_append_c(str, ' ');
+		imap_append_string(str, params[i].value);
+	}
+	if (default_charset && !seen_charset) {
+		if (i > 0)
+			str_append_c(str, ' ');
+		str_append(str, "\"charset\" "
+			"\""MESSAGE_PART_DEFAULT_CHARSET"\"");
+	}
+	str_append_c(str, ')');
+}
+
+static int
+part_write_bodystructure_siblings(const struct message_part *part,
+				  string_t *dest, bool extended,
+				  const char **error_r)
+{
+	for (; part != NULL; part = part->next) {
+		str_append_c(dest, '(');
+		if (imap_bodystructure_write(part, dest, extended, error_r) < 0)
+			return -1;
+		str_append_c(dest, ')');
+	}
+	return 0;
+}
+
+static void
+part_write_bodystructure_common(const struct message_part_data *data,
+				     string_t *str)
+{
+	str_append_c(str, ' ');
+	if (data->content_disposition == NULL)
+		str_append(str, "NIL");
+	else {
+		str_append_c(str, '(');
+		imap_append_string(str, data->content_disposition);
+
+		str_append_c(str, ' ');
+		params_write(data->content_disposition_params,
+			data->content_disposition_params_count, str, FALSE);
+
+		str_append_c(str, ')');
+	}
+
+	str_append_c(str, ' ');
+	if (data->content_language == NULL)
+		str_append(str, "NIL");
+	else {
+		const char *const *lang = data->content_language;
+
+		i_assert(*lang != NULL);
+		str_append_c(str, '(');
+		imap_append_string(str, *lang);
+		lang++;
+		while (*lang != NULL) {
+			str_append_c(str, ' ');
+			imap_append_string(str, *lang);
+			lang++;
+		}
+		str_append_c(str, ')');
+	}
+
+	str_append_c(str, ' ');
+	imap_append_nstring_nolf(str, data->content_location);
+}
+
+static int part_write_body_multipart(const struct message_part *part,
+				     string_t *str, bool extended,
+				     const char **error_r)
+{
+	const struct message_part_data *data = part->data;
+
+	i_assert(part->data != NULL);
+
+	if (part->children != NULL) {
+		if (part_write_bodystructure_siblings(part->children, str,
+						      extended, error_r) < 0)
+			return -1;
+	} else {
+		/* no parts in multipart message,
+		   that's not allowed. write a single
+		   0-length text/plain structure */
+		if (!extended)
+			str_append(str, EMPTY_BODY);
+		else
+			str_append(str, EMPTY_BODYSTRUCTURE);
+	}
+
+	str_append_c(str, ' ');
+	imap_append_string(str, data->content_subtype);
+
+	if (!extended)
+		return 0;
+
+	/* BODYSTRUCTURE data */
+
+	str_append_c(str, ' ');
+	params_write(data->content_type_params,
+		data->content_type_params_count, str, FALSE);
+
+	part_write_bodystructure_common(data, str);
+	return 0;
+}
+
+static bool part_is_truncated(const struct message_part *part)
+{
+	const struct message_part_data *data = part->data;
+
+	i_assert((part->flags & MESSAGE_PART_FLAG_MESSAGE_RFC822) == 0);
+	i_assert((part->flags & MESSAGE_PART_FLAG_MULTIPART) == 0);
+
+	if (data->content_type != NULL) {
+		if (strcasecmp(data->content_type, "message") == 0 &&
+		    strcasecmp(data->content_subtype, "rfc822") == 0) {
+			/* It's message/rfc822, but without
+			   MESSAGE_PART_FLAG_MESSAGE_RFC822. */
+			return TRUE;
+		}
+		if (strcasecmp(data->content_type, "multipart") == 0) {
+			/* It's multipart/, but without
+			   MESSAGE_PART_FLAG_MULTIPART. */
+			return TRUE;
+		}
+	} else {
+		/* No Content-Type */
+		if (part->parent != NULL &&
+		    (part->parent->flags & MESSAGE_PART_FLAG_MULTIPART_DIGEST) != 0) {
+			/* Parent is MESSAGE_PART_FLAG_MULTIPART_DIGEST
+			   (so this should have been message/rfc822). */
+			return TRUE;
+		}
+	}
+	return FALSE;
+}
+
+static int part_write_body(const struct message_part *part,
+			   string_t *str, bool extended, const char **error_r)
+{
+	const struct message_part_data *data = part->data;
+	bool text;
+
+	i_assert(part->data != NULL);
+
+	if ((part->flags & MESSAGE_PART_FLAG_MESSAGE_RFC822) != 0) {
+		str_append(str, "\"message\" \"rfc822\"");
+		text = FALSE;
+	} else if (part_is_truncated(part)) {
+		/* Maximum MIME part count was reached while parsing the mail.
+		   Write this part out as application/octet-stream instead.
+		   We're not using text/plain, because it would require
+		   message-parser to use MESSAGE_PART_FLAG_TEXT for this part
+		   to avoid losing line count in message_part serialization. */
+		str_append(str, "\"application\" \"octet-stream\"");
+		text = FALSE;
+	} else {
+		/* "content type" "subtype" */
+		if (data->content_type == NULL) {
+			text = TRUE;
+			str_append(str, "\"text\" \"plain\"");
+		} else {
+			text = (strcasecmp(data->content_type, "text") == 0);
+			imap_append_string(str, data->content_type);
+			str_append_c(str, ' ');
+			imap_append_string(str, data->content_subtype);
+		}
+		bool part_is_text = (part->flags & MESSAGE_PART_FLAG_TEXT) != 0;
+		if (text != part_is_text) {
+			*error_r = "text flag mismatch";
+			return -1;
+		}
+	}
+
+	/* ("content type param key" "value" ...) */
+	str_append_c(str, ' ');
+	params_write(data->content_type_params,
+		data->content_type_params_count, str, text);
+
+	str_append_c(str, ' ');
+	imap_append_nstring_nolf(str, data->content_id);
+	str_append_c(str, ' ');
+	imap_append_nstring_nolf(str, data->content_description);
+	str_append_c(str, ' ');
+	if (data->content_transfer_encoding != NULL)
+		imap_append_string(str, data->content_transfer_encoding);
+	else
+		str_append(str, "\"7bit\"");
+	str_printfa(str, " %"PRIuUOFF_T, part->body_size.virtual_size);
+
+	if (text) {
+		/* text/.. contains line count */
+		str_printfa(str, " %u", part->body_size.lines);
+	} else if ((part->flags & MESSAGE_PART_FLAG_MESSAGE_RFC822) != 0) {
+		/* message/rfc822 contains envelope + body + line count */
+		const struct message_part_data *child_data;
+
+		i_assert(part->children != NULL);
+		i_assert(part->children->next == NULL);
+
+		child_data = part->children->data;
+
+		str_append(str, " (");
+		imap_envelope_write(child_data->envelope, str);
+		str_append(str, ") ");
+
+		if (part_write_bodystructure_siblings(part->children, str,
+						      extended, error_r) < 0)
+			return -1;
+		str_printfa(str, " %u", part->body_size.lines);
+	}
+
+	if (!extended)
+		return 0;
+
+	/* BODYSTRUCTURE data */
+
+	/* "md5" ("content disposition" ("disposition" "params"))
+	   ("body" "language" "params") "location" */
+	str_append_c(str, ' ');
+	imap_append_nstring_nolf(str, data->content_md5);
+	part_write_bodystructure_common(data, str);
+	return 0;
+}
+
+int imap_bodystructure_write(const struct message_part *part,
+			     string_t *dest, bool extended,
+			     const char **error_r)
+{
+	if ((part->flags & MESSAGE_PART_FLAG_MULTIPART) != 0)
+		return part_write_body_multipart(part, dest, extended, error_r);
+	else
+		return part_write_body(part, dest, extended, error_r);
+}
+
+/*
+ * IMAP BODYSTRUCTURE parsing
+ */
+
+static int
+imap_bodystructure_strlist_parse(const struct imap_arg *arg,
+	pool_t pool, const char *const **list_r)
+{
+	const char *item, **list;
+	const struct imap_arg *list_args;
+	unsigned int list_count, i;
+
+	if (arg->type == IMAP_ARG_NIL) {
+		*list_r = NULL;
+		return 0;
+	}
+	if (imap_arg_get_nstring(arg, &item)) {
+		list = p_new(pool, const char *, 2);
+		list[0] = p_strdup(pool, item);
+	} else {
+		if (!imap_arg_get_list_full(arg, &list_args, &list_count))
+			return -1;
+		if (list_count == 0)
+			return -1;
+
+		list = p_new(pool, const char *, list_count+1);
+		for (i = 0; i < list_count; i++) {
+			if (!imap_arg_get_string(&list_args[i], &item))
+				return -1;
+			list[i] = p_strdup(pool, item);
+		}
+	}
+	*list_r = list;
+	return 0;
+}
+
+static int
+imap_bodystructure_params_parse(const struct imap_arg *arg,
+	pool_t pool, const struct message_part_param **params_r,
+	unsigned int *count_r)
+{
+	struct message_part_param *params;
+	const struct imap_arg *list_args;
+	unsigned int list_count, params_count, i;
+
+	if (arg->type == IMAP_ARG_NIL) {
+		*params_r = NULL;
+		return 0;
+	}
+	if (!imap_arg_get_list_full(arg, &list_args, &list_count))
+		return -1;
+	if ((list_count % 2) != 0)
+		return -1;
+	if (list_count == 0)
+		return -1;
+
+	params_count = list_count/2;
+	params = p_new(pool, struct message_part_param, params_count+1);
+	for (i = 0; i < params_count; i++) {
+		const char *name, *value;
+
+		if (!imap_arg_get_string(&list_args[i*2+0], &name))
+			return -1;
+		if (!imap_arg_get_string(&list_args[i*2+1], &value))
+			return -1;
+		params[i].name = p_strdup(pool, name);
+		params[i].value = p_strdup(pool, value);
+	}
+	*params_r = params;
+	*count_r = params_count;
+	return 0;
+}
+
+static int
+imap_bodystructure_parse_args_common(struct message_part *part,
+				     pool_t pool, const struct imap_arg *args,
+				     const char **error_r)
+{
+	struct message_part_data *data = part->data;
+	const struct imap_arg *list_args;
+
+	if (args->type == IMAP_ARG_EOL)
+		return 0;
+	if (args->type == IMAP_ARG_NIL)
+		args++;
+	else if (!imap_arg_get_list(args, &list_args)) {
+		*error_r = "Invalid content-disposition list";
+		return -1;
+	} else {
+		if (!imap_arg_get_string
+			(list_args++, &data->content_disposition)) {
+			*error_r = "Invalid content-disposition";
+			return -1;
+		}
+		data->content_disposition = p_strdup(pool, data->content_disposition);
+		if (imap_bodystructure_params_parse(list_args, pool,
+			&data->content_disposition_params,
+			&data->content_disposition_params_count) < 0) {
+			*error_r = "Invalid content-disposition params";
+			return -1;
+		}
+		args++;
+	}
+	if (args->type == IMAP_ARG_EOL)
+		return 0;
+	if (imap_bodystructure_strlist_parse
+		(args++, pool, &data->content_language) < 0) {
+		*error_r = "Invalid content-language";
+		return -1;
+	}
+	if (args->type == IMAP_ARG_EOL)
+		return 0;
+	if (!imap_arg_get_nstring
+		(args++, &data->content_location)) {
+		*error_r = "Invalid content-location";
+		return -1;
+	}
+	data->content_location = p_strdup(pool, data->content_location);
+	return 0;
+}
+
+int
+imap_bodystructure_parse_args(const struct imap_arg *args, pool_t pool,
+			      struct message_part **_part,
+			      const char **error_r)
+{
+	struct message_part *part = *_part, *child_part;;
+	struct message_part **child_part_p;
+	struct message_part_data *data;
+	const struct imap_arg *list_args;
+	const char *value, *content_type, *subtype, *error;
+	bool multipart, text, message_rfc822, parsing_tree, has_lines;
+	unsigned int lines;
+	uoff_t vsize;
+
+	if (part != NULL) {
+		/* parsing with pre-existing message_part tree */
+		parsing_tree = FALSE;
+	} else {
+		/* parsing message_part tree from BODYSTRUCTURE as well */
+		part = *_part = p_new(pool, struct message_part, 1);
+		parsing_tree = TRUE;
+	}
+	part->data = data = p_new(pool, struct message_part_data, 1);
+
+	multipart = FALSE;
+	if (!parsing_tree) {
+		if ((part->flags & MESSAGE_PART_FLAG_MULTIPART) != 0 &&
+			part->children == NULL) {
+			struct message_part_data dummy_part_data = {
+				.content_type = "text",
+				.content_subtype = "plain",
+				.content_transfer_encoding = "7bit"
+			};
+			struct message_part dummy_part = {
+				.parent = part,
+				.data = &dummy_part_data,
+				.flags = MESSAGE_PART_FLAG_TEXT
+			};
+			struct message_part *dummy_partp = &dummy_part;
+
+			/* no parts in multipart message,
+			   that's not allowed. expect a single
+			   0-length text/plain structure */
+			if (args->type != IMAP_ARG_LIST ||
+				(args+1)->type == IMAP_ARG_LIST) {
+				*error_r = "message_part hierarchy "
+					"doesn't match BODYSTRUCTURE";
+				return -1;
+			}
+
+			list_args = imap_arg_as_list(args);
+			if (imap_bodystructure_parse_args(list_args, pool,
+								&dummy_partp, error_r) < 0)
+				return -1;
+			child_part = NULL;
+
+			multipart = TRUE;
+			args++;
+
+		} else {
+			child_part = part->children;
+			while (args->type == IMAP_ARG_LIST) {
+				if ((part->flags & MESSAGE_PART_FLAG_MULTIPART) == 0 ||
+						child_part == NULL) {
+					*error_r = "message_part hierarchy "
+						"doesn't match BODYSTRUCTURE";
+					return -1;
+				}
+
+				list_args = imap_arg_as_list(args);
+				if (imap_bodystructure_parse_args(list_args, pool,
+									&child_part, error_r) < 0)
+					return -1;
+				child_part = child_part->next;
+
+				multipart = TRUE;
+				args++;
+			}
+		}
+		if (multipart) {
+			if (child_part != NULL) {
+				*error_r = "message_part hierarchy "
+					"doesn't match BODYSTRUCTURE";
+				return -1;
+			}
+		} else 	if ((part->flags & MESSAGE_PART_FLAG_MULTIPART) != 0) {
+			*error_r = "message_part multipart flag "
+				"doesn't match BODYSTRUCTURE";
+			return -1;
+		}
+	} else {
+		child_part_p = &part->children;
+		while (args->type == IMAP_ARG_LIST) {
+			list_args = imap_arg_as_list(args);
+			if (imap_bodystructure_parse_args(list_args, pool,
+								child_part_p, error_r) < 0)
+				return -1;
+			(*child_part_p)->parent = part;
+			child_part_p = &(*child_part_p)->next;
+
+			multipart = TRUE;
+			args++;
+		}
+		if (multipart) {
+			part->flags |= MESSAGE_PART_FLAG_MULTIPART;
+		}
+	}
+
+	if (multipart) {
+		data->content_type = "multipart";
+		if (!imap_arg_get_string(args++, &data->content_subtype)) {
+			*error_r = "Invalid multipart content-type";
+			return -1;
+		}
+		data->content_subtype = p_strdup(pool, data->content_subtype);
+		if (args->type == IMAP_ARG_EOL)
+			return 0;
+		if (imap_bodystructure_params_parse(args++, pool,
+			&data->content_type_params,
+			&data->content_type_params_count) < 0) {
+			*error_r = "Invalid content params";
+			return -1;
+		}
+		return imap_bodystructure_parse_args_common
+			(part, pool, args, error_r);
+	}
+
+	/* "content type" "subtype" */
+	if (!imap_arg_get_string(&args[0], &content_type) ||
+	    !imap_arg_get_string(&args[1], &subtype)) {
+		*error_r = "Invalid content-type";
+		return -1;
+	}
+	data->content_type = p_strdup(pool, content_type);
+	data->content_subtype = p_strdup(pool, subtype);
+	args += 2;
+
+	text = strcasecmp(content_type, "text") == 0;
+	message_rfc822 = strcasecmp(content_type, "message") == 0 &&
+		strcasecmp(subtype, "rfc822") == 0;
+
+	if (!parsing_tree) {
+#if 0
+		/* Disabled for now. Earlier Dovecot versions handled broken
+		   Content-Type headers by writing them as "text" "plain" to
+		   BODYSTRUCTURE reply, but the message_part didn't have
+		   MESSAGE_PART_FLAG_TEXT. */
+		if (text != ((part->flags & MESSAGE_PART_FLAG_TEXT) != 0)) {
+			*error_r = "message_part text flag "
+				"doesn't match BODYSTRUCTURE";
+			return -1;
+		}
+#endif
+		if (message_rfc822 !=
+			((part->flags & MESSAGE_PART_FLAG_MESSAGE_RFC822) != 0)) {
+			*error_r = "message_part message/rfc822 flag "
+				"doesn't match BODYSTRUCTURE";
+			return -1;
+		}
+	} else {
+		if (text)
+			part->flags |= MESSAGE_PART_FLAG_TEXT;
+		if (message_rfc822)
+			part->flags |= MESSAGE_PART_FLAG_MESSAGE_RFC822;
+	}
+
+	/* ("content type param key" "value" ...) | NIL */
+	if (imap_bodystructure_params_parse(args++, pool,
+		&data->content_type_params,
+		&data->content_type_params_count) < 0) {
+		*error_r = "Invalid content params";
+		return -1;
+	}
+
+	/* "content id" "content description" "transfer encoding" size */
+	if (!imap_arg_get_nstring(args++, &data->content_id)) {
+		*error_r = "Invalid content-id";
+		return -1;
+	}
+	if (!imap_arg_get_nstring(args++, &data->content_description)) {
+		*error_r = "Invalid content-description";
+		return -1;
+	}
+	if (!imap_arg_get_string(args++, &data->content_transfer_encoding)) {
+		*error_r = "Invalid content-transfer-encoding";
+		return -1;
+	}
+	data->content_id = p_strdup(pool, data->content_id);
+	data->content_description = p_strdup(pool, data->content_description);
+	data->content_transfer_encoding =
+		p_strdup(pool, data->content_transfer_encoding);
+	if (!imap_arg_get_atom(args++, &value) ||
+	    str_to_uoff(value, &vsize) < 0) {
+		*error_r = "Invalid size field";
+		return -1;
+	}
+	if (!parsing_tree) {
+		if (vsize != part->body_size.virtual_size) {
+			*error_r = "message_part virtual_size doesn't match "
+				"size in BODYSTRUCTURE";
+			return -1;
+		}
+	} else {
+		part->body_size.virtual_size = vsize;
+	}
+
+	if (text) {
+		/* text/xxx - text lines */
+		if (!imap_arg_get_atom(args++, &value) ||
+		    str_to_uint(value, &lines) < 0) {
+			*error_r = "Invalid lines field";
+			return -1;
+		}
+		i_assert(part->children == NULL);
+		has_lines = TRUE;
+	} else if (message_rfc822) {
+		/* message/rfc822 - envelope + bodystructure + text lines */
+
+		if (!parsing_tree) {
+			i_assert(part->children != NULL &&
+				 part->children->next == NULL);
+		}
+
+		if (!imap_arg_get_list(&args[1], &list_args)) {
+			*error_r = "Child bodystructure list expected";
+			return -1;
+		}
+		if (imap_bodystructure_parse_args
+			(list_args, pool, &part->children, error_r) < 0)
+			return -1;
+		if (parsing_tree) {
+			i_assert(part->children != NULL &&
+				 part->children->next == NULL);
+			part->children->parent = part;
+		}
+
+		if (!imap_arg_get_list(&args[0], &list_args)) {
+			*error_r = "Envelope list expected";
+			return -1;
+		}
+		if (!imap_envelope_parse_args(list_args, pool,
+			&part->children->data->envelope, &error)) {
+			*error_r = t_strdup_printf
+				("Invalid envelope list: %s", error);
+			return -1;
+		}
+		args += 2;
+		if (!imap_arg_get_atom(args++, &value) ||
+		    str_to_uint(value, &lines) < 0) {
+			*error_r = "Invalid lines field";
+			return -1;
+		}
+		has_lines = TRUE;
+	} else {
+		i_assert(part->children == NULL);
+		lines = 0;
+		has_lines = FALSE;
+	}
+	if (!parsing_tree) {
+		if (has_lines && lines != part->body_size.lines) {
+			*error_r = "message_part lines "
+				"doesn't match lines in BODYSTRUCTURE";
+			return -1;
+		}
+	} else {
+		part->body_size.lines = lines;
+	}
+	if (args->type == IMAP_ARG_EOL)
+		return 0;
+	if (!imap_arg_get_nstring(args++, &data->content_md5)) {
+		*error_r = "Invalid content-md5";
+		return -1;
+	}
+	data->content_md5 = p_strdup(pool, data->content_md5);
+	return imap_bodystructure_parse_args_common
+		(part, pool, args, error_r);
+}
+
+int imap_bodystructure_parse_full(const char *bodystructure,
+	pool_t pool, struct message_part **parts,
+	const char **error_r)
+{
+	struct istream *input;
+	struct imap_parser *parser;
+	const struct imap_arg *args;
+	int ret;
+
+	i_assert(*parts == NULL || (*parts)->next == NULL);
+
+	input = i_stream_create_from_data(bodystructure, strlen(bodystructure));
+	(void)i_stream_read(input);
+
+	parser = imap_parser_create(input, NULL, SIZE_MAX);
+	ret = imap_parser_finish_line(parser, 0,
+				      IMAP_PARSE_FLAG_LITERAL_TYPE, &args);
+	if (ret < 0) {
+		*error_r = t_strdup_printf("IMAP parser failed: %s",
+					   imap_parser_get_error(parser, NULL));
+	} else if (ret == 0) {
+		*error_r = "Empty bodystructure";
+		ret = -1;
+	} else {
+		T_BEGIN {
+			ret = imap_bodystructure_parse_args
+				(args, pool, parts, error_r);
+		} T_END_PASS_STR_IF(ret < 0, error_r);
+	}
+
+	imap_parser_unref(&parser);
+	i_stream_destroy(&input);
+	return ret;
+}
+
+int imap_bodystructure_parse(const char *bodystructure,
+	pool_t pool, struct message_part *parts,
+	const char **error_r)
+{
+	i_assert(parts != NULL);
+
+	return imap_bodystructure_parse_full(bodystructure,
+		pool, &parts, error_r);
+}
+
+/*
+ * IMAP BODYSTRUCTURE to BODY conversion
+ */
+
+static bool str_append_nstring(string_t *str, const struct imap_arg *arg)
+{
+	const char *cstr;
+
+	if (!imap_arg_get_nstring(arg, &cstr))
+		return FALSE;
+
+	switch (arg->type) {
+	case IMAP_ARG_NIL:
+		str_append(str, "NIL");
+		break;
+	case IMAP_ARG_STRING:
+		str_append_c(str, '"');
+		/* NOTE: we're parsing with no-unescape flag,
+		   so don't double-escape it here */
+		str_append(str, cstr);
+		str_append_c(str, '"');
+		break;
+	case IMAP_ARG_LITERAL: {
+		str_printfa(str, "{%zu}\r\n", strlen(cstr));
+		str_append(str, cstr);
+		break;
+	}
+	default:
+		i_unreached();
+		return FALSE;
+	}
+	return TRUE;
+}
+
+static void
+imap_write_envelope_list(const struct imap_arg *args, string_t *str,
+	bool toplevel)
+{
+	const struct imap_arg *children;
+
+	/* don't do any typechecking, just write it out */
+	while (!IMAP_ARG_IS_EOL(args)) {
+		bool list = FALSE;
+
+		if (!str_append_nstring(str, args)) {
+			if (!imap_arg_get_list(args, &children)) {
+				/* everything is either nstring or list */
+				i_unreached();
+			}
+
+			str_append_c(str, '(');
+			imap_write_envelope_list(children, str, FALSE);
+			str_append_c(str, ')');
+
+			list = TRUE;
+		}
+		args++;
+
+		if ((toplevel || !list) && !IMAP_ARG_IS_EOL(args))
+			str_append_c(str, ' ');
+	}
+}
+
+static void
+imap_write_envelope(const struct imap_arg *args, string_t *str)
+{
+	imap_write_envelope_list(args, str, TRUE);
+}
+
+static int imap_parse_bodystructure_args(const struct imap_arg *args,
+					 string_t *str, const char **error_r)
+{
+	const struct imap_arg *subargs;
+	const struct imap_arg *list_args;
+	const char *value, *content_type, *subtype;
+	bool multipart, text, message_rfc822;
+	int i;
+
+	multipart = FALSE;
+	while (args->type == IMAP_ARG_LIST) {
+		str_append_c(str, '(');
+		list_args = imap_arg_as_list(args);
+		if (imap_parse_bodystructure_args(list_args, str, error_r) < 0)
+			return -1;
+		str_append_c(str, ')');
+
+		multipart = TRUE;
+		args++;
+	}
+
+	if (multipart) {
+		/* next is subtype of Content-Type. rest is skipped. */
+		str_append_c(str, ' ');
+		if (!str_append_nstring(str, args)) {
+			*error_r = "Invalid multipart content-type";
+			return -1;
+		}
+		return 0;
+	}
+
+	/* "content type" "subtype" */
+	if (!imap_arg_get_string(&args[0], &content_type) ||
+	    !imap_arg_get_string(&args[1], &subtype)) {
+		*error_r = "Invalid content-type";
+		return -1;
+	}
+
+	if (!str_append_nstring(str, &args[0]))
+		i_unreached();
+	str_append_c(str, ' ');
+	if (!str_append_nstring(str, &args[1]))
+		i_unreached();
+
+	text = strcasecmp(content_type, "text") == 0;
+	message_rfc822 = strcasecmp(content_type, "message") == 0 &&
+		strcasecmp(subtype, "rfc822") == 0;
+
+	args += 2;
+
+	/* ("content type param key" "value" ...) | NIL */
+	if (imap_arg_get_list(args, &subargs)) {
+		str_append(str, " (");
+		while (!IMAP_ARG_IS_EOL(subargs)) {
+			if (!str_append_nstring(str, &subargs[0])) {
+				*error_r = "Invalid content param key";
+				return -1;
+			}
+			str_append_c(str, ' ');
+			if (!str_append_nstring(str, &subargs[1])) {
+				*error_r = "Invalid content param value";
+				return -1;
+			}
+
+			subargs += 2;
+			if (IMAP_ARG_IS_EOL(subargs))
+				break;
+			str_append_c(str, ' ');
+		}
+		str_append(str, ")");
+	} else if (args->type == IMAP_ARG_NIL) {
+		str_append(str, " NIL");
+	} else {
+		*error_r = "list/NIL expected";
+		return -1;
+	}
+	args++;
+
+	/* "content id" "content description" "transfer encoding" size */
+	for (i = 0; i < 3; i++, args++) {
+		str_append_c(str, ' ');
+
+		if (!str_append_nstring(str, args)) {
+			*error_r = "nstring expected";
+			return -1;
+		}
+	}
+	if (!imap_arg_get_atom(args, &value)) {
+		*error_r = "atom expected for size";
+		return -1;
+	}
+	str_printfa(str, " %s", value);
+	args++;
+
+	if (text) {
+		/* text/xxx - text lines */
+		if (!imap_arg_get_atom(args, &value)) {
+			*error_r = "Text lines expected";
+			return -1;
+		}
+
+		str_append_c(str, ' ');
+		str_append(str, value);
+	} else if (message_rfc822) {
+		/* message/rfc822 - envelope + bodystructure + text lines */
+		str_append_c(str, ' ');
+
+		if (!imap_arg_get_list(&args[0], &list_args)) {
+			*error_r = "Envelope list expected";
+			return -1;
+		}
+		str_append_c(str, '(');
+		imap_write_envelope(list_args, str);
+		str_append(str, ") (");
+
+		if (!imap_arg_get_list(&args[1], &list_args)) {
+			*error_r = "Child bodystructure list expected";
+			return -1;
+		}
+		if (imap_parse_bodystructure_args(list_args, str, error_r) < 0)
+			return -1;
+
+		str_append(str, ") ");
+		if (!imap_arg_get_atom(&args[2], &value)) {
+			*error_r = "Text lines expected";
+			return -1;
+		}
+		str_append(str, value);
+	}
+	return 0;
+}
+
+int imap_body_parse_from_bodystructure(const char *bodystructure,
+				       string_t *dest, const char **error_r)
+{
+	struct istream *input;
+	struct imap_parser *parser;
+	const struct imap_arg *args;
+	int ret;
+
+	input = i_stream_create_from_data(bodystructure, strlen(bodystructure));
+	(void)i_stream_read(input);
+
+	parser = imap_parser_create(input, NULL, SIZE_MAX);
+	ret = imap_parser_finish_line(parser, 0, IMAP_PARSE_FLAG_NO_UNESCAPE |
+				      IMAP_PARSE_FLAG_LITERAL_TYPE, &args);
+	if (ret < 0) {
+		*error_r = t_strdup_printf("IMAP parser failed: %s",
+					   imap_parser_get_error(parser, NULL));
+	} else if (ret == 0) {
+		*error_r = "Empty bodystructure";
+		ret = -1;
+	} else {
+		ret = imap_parse_bodystructure_args(args, dest, error_r);
+	}
+
+	imap_parser_unref(&parser);
+	i_stream_destroy(&input);
+	return ret;
+}
diff --git a/src/lib-imap/imap-bodystructure.h b/src/lib-imap/imap-bodystructure.h
new file mode 100644
index 0000000..a7cc6cd
--- /dev/null
+++ b/src/lib-imap/imap-bodystructure.h
@@ -0,0 +1,39 @@
+#ifndef IMAP_BODYSTRUCTURE_H
+#define IMAP_BODYSTRUCTURE_H
+
+struct message_part;
+struct message_header_line;
+struct imap_arg;
+
+/* Write a BODY/BODYSTRUCTURE from given message_part. The message_part->data
+   field must be set. part->body_size.virtual_size and .lines are also used
+   for writing it. Returns 0 on success, -1 if parts don't internally match
+   (e.g. broken cached mime.parts mixed with parsed message). */
+int imap_bodystructure_write(const struct message_part *part,
+			     string_t *dest, bool extended,
+			     const char **error_r);
+
+/* Parse BODYSTRUCTURE and save the contents to message_part->data for each
+   message tree node. If the parts argument points to NULL, the message_part
+   tree is created from the BODYSTRUCTURE. Otherwise, existing tree is used.
+   Returns 0 if ok, -1 if bodystructure wasn't valid. */
+int imap_bodystructure_parse_full(const char *bodystructure, pool_t pool,
+			     struct message_part **parts, const char **error_r);
+
+/* Same as imap_bodystructure_parse_full(), but read the input from imap_args
+   instead of a string. */
+int imap_bodystructure_parse_args(const struct imap_arg *args, pool_t pool,
+			     struct message_part **parts, const char **error_r);
+
+/* Parse BODYSTRUCTURE and save the contents to message_part->data for each
+   message tree node. The parts argument must point to an existing message_part
+   tree. Returns 0 if ok, -1 if bodystructure wasn't valid. */
+int imap_bodystructure_parse(const char *bodystructure, pool_t pool,
+			     struct message_part *parts, const char **error_r);
+
+/* Get BODY part from BODYSTRUCTURE and write it to dest.
+   Returns 0 if ok, -1 if bodystructure wasn't valid. */
+int imap_body_parse_from_bodystructure(const char *bodystructure,
+				       string_t *dest, const char **error_r);
+
+#endif
diff --git a/src/lib-imap/imap-date.c b/src/lib-imap/imap-date.c
new file mode 100644
index 0000000..2e5569a
--- /dev/null
+++ b/src/lib-imap/imap-date.c
@@ -0,0 +1,247 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "utc-offset.h"
+#include "utc-mktime.h"
+#include "imap-date.h"
+
+#include <ctype.h>
+
+static const char *month_names[] = {
+	"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+};
+
+static int parse_timezone(const char *str)
+{
+	int offset;
+
+	/* +|-zone */
+	if ((*str != '+' && *str != '-') ||
+	    !i_isdigit(str[1]) || !i_isdigit(str[2]) ||
+	    !i_isdigit(str[3]) || !i_isdigit(str[4]))
+		return 0;
+
+	offset = (str[1]-'0') * 10*60 + (str[2]-'0') * 60 +
+		(str[3]-'0') * 10 + (str[4]-'0');
+	return *str == '+' ? offset : -offset;
+}
+
+static const char *imap_parse_date_internal(const char *str, struct tm *tm)
+{
+	int i;
+
+	if (str == NULL || *str == '\0')
+		return NULL;
+
+	i_zero(tm);
+
+	/* "dd-mon-yyyy [hh:mi:ss +|-zone]"
+	   dd is 1-2 digits and may be prefixed with space or zero. */
+
+	if (str[0] == ' ') {
+		/* " d-..." */
+		str++;
+	}
+
+	if (!(i_isdigit(str[0]) && (str[1] == '-' ||
+				    (i_isdigit(str[1]) && str[2] == '-'))))
+	      return NULL;
+
+	tm->tm_mday = (str[0]-'0');
+	if (str[1] == '-')
+		str += 2;
+	else {
+		tm->tm_mday = (tm->tm_mday * 10) + (str[1]-'0');
+		str += 3;
+	}
+
+	/* month name */
+	for (i = 0; i < 12; i++) {
+		if (strncasecmp(month_names[i], str, 3) == 0) {
+			tm->tm_mon = i;
+			break;
+		}
+	}
+	if (i == 12 || str[3] != '-')
+		return NULL;
+	str += 4;
+
+	/* yyyy */
+	if (!i_isdigit(str[0]) || !i_isdigit(str[1]) ||
+	    !i_isdigit(str[2]) || !i_isdigit(str[3]))
+		return NULL;
+
+	tm->tm_year = (str[0]-'0') * 1000 + (str[1]-'0') * 100 +
+		(str[2]-'0') * 10 + (str[3]-'0') - 1900;
+
+	str += 4;
+	return str;
+}
+
+static bool imap_mktime(struct tm *tm, time_t *time_r)
+{
+	*time_r = utc_mktime(tm);
+	if (*time_r != (time_t)-1)
+		return TRUE;
+
+	/* the date is outside valid range for time_t. it might still be
+	   technically valid though, so try to handle this case.
+	   with 64bit time_t the full 0..9999 year range is valid. */
+	if (tm->tm_year <= 100) {
+		/* too old. time_t can be signed or unsigned, handle
+		   both cases. */
+		*time_r = (time_t)-1 < (int)0 ? INT_MIN : 0;
+	} else {
+		/* too high. return the highest allowed value.
+		   we shouldn't get here with 64bit time_t,
+		   but handle that anyway. */
+#if (TIME_T_MAX_BITS == 32 || TIME_T_MAX_BITS == 64)
+		*time_r = (1UL << (TIME_T_MAX_BITS-1)) - 1;
+#else
+		*time_r = (1UL << TIME_T_MAX_BITS) - 1;
+#endif
+	}
+	return FALSE;
+}
+
+bool imap_parse_date(const char *str, time_t *timestamp_r)
+{
+	struct tm tm;
+
+	str = imap_parse_date_internal(str, &tm);
+	if (str == NULL || str[0] != '\0')
+		return FALSE;
+
+	tm.tm_isdst = -1;
+	(void)imap_mktime(&tm, timestamp_r);
+	return TRUE;
+}
+
+bool imap_parse_datetime(const char *str, time_t *timestamp_r,
+			 int *timezone_offset_r)
+{
+	struct tm tm;
+
+	str = imap_parse_date_internal(str, &tm);
+	if (str == NULL)
+		return FALSE;
+
+	if (str[0] != ' ')
+		return FALSE;
+	str++;
+
+	/* hh: */
+	if (!i_isdigit(str[0]) || !i_isdigit(str[1]) || str[2] != ':')
+		return FALSE;
+	tm.tm_hour = (str[0]-'0') * 10 + (str[1]-'0');
+	str += 3;
+
+	/* mm: */
+	if (!i_isdigit(str[0]) || !i_isdigit(str[1]) || str[2] != ':')
+		return FALSE;
+	tm.tm_min = (str[0]-'0') * 10 + (str[1]-'0');
+	str += 3;
+
+	/* ss */
+	if (!i_isdigit(str[0]) || !i_isdigit(str[1]) || str[2] != ' ')
+		return FALSE;
+	tm.tm_sec = (str[0]-'0') * 10 + (str[1]-'0');
+	str += 3;
+
+	/* timezone */
+	*timezone_offset_r = parse_timezone(str);
+
+	tm.tm_isdst = -1;
+	if (imap_mktime(&tm, timestamp_r))
+		*timestamp_r -= *timezone_offset_r * 60;
+	return TRUE;
+}
+
+static void imap_to_date_tm(char buf[11], const struct tm *tm)
+{
+	int year;
+
+	/* dd-mon- */
+	buf[0] = (tm->tm_mday / 10) + '0';
+	buf[1] = (tm->tm_mday % 10) + '0';
+	buf[2] = '-';
+	memcpy(buf+3, month_names[tm->tm_mon], 3);
+	buf[6] = '-';
+
+	/* yyyy */
+	year = tm->tm_year + 1900;
+	buf[7] = (year / 1000) + '0';
+	buf[8] = ((year / 100) % 10) + '0';
+	buf[9] = ((year / 10) % 10) + '0';
+	buf[10] = (year % 10) + '0';
+}
+
+static const char *
+imap_to_datetime_tm(const struct tm *tm, int timezone_offset)
+{
+	char *buf;
+
+	/* @UNSAFE: but faster than t_strdup_printf() call.. */
+	buf = t_malloc0(27);
+	imap_to_date_tm(buf, tm);
+	buf[11] = ' ';
+
+	/* hh:mi:ss */
+	buf[12] = (tm->tm_hour / 10) + '0';
+	buf[13] = (tm->tm_hour % 10) + '0';
+	buf[14] = ':';
+	buf[15] = (tm->tm_min / 10) + '0';
+	buf[16] = (tm->tm_min % 10) + '0';
+	buf[17] = ':';
+	buf[18] = (tm->tm_sec / 10) + '0';
+	buf[19] = (tm->tm_sec % 10) + '0';
+	buf[20] = ' ';
+
+	/* timezone */
+	if (timezone_offset >= 0)
+		buf[21] = '+';
+	else {
+		buf[21] = '-';
+		timezone_offset = -timezone_offset;
+	}
+	buf[22] = (timezone_offset / 600) + '0';
+	buf[23] = ((timezone_offset / 60) % 10) + '0';
+	buf[24] = ((timezone_offset % 60) / 10) + '0';
+	buf[25] = (timezone_offset % 10) + '0';
+	buf[26] = '\0';
+
+	return buf;
+}
+
+const char *imap_to_datetime(time_t timestamp)
+{
+	struct tm *tm;
+	int timezone_offset;
+
+	tm = localtime(&timestamp);
+	timezone_offset = utc_offset(tm, timestamp);
+	return imap_to_datetime_tm(tm, timezone_offset);
+}
+
+const char *imap_to_datetime_tz(time_t timestamp, int timezone_offset)
+{
+	const struct tm *tm;
+	time_t adjusted = timestamp + timezone_offset*60;
+
+	tm = gmtime(&adjusted);
+	return imap_to_datetime_tm(tm, timezone_offset);
+}
+
+bool imap_to_date(time_t timestamp, const char **str_r)
+{
+	const struct tm *tm;
+	char *buf;
+
+	tm = localtime(&timestamp);
+
+	buf = t_malloc0(12);
+	imap_to_date_tm(buf, tm);
+	*str_r = buf;
+	return tm->tm_hour == 0 && tm->tm_min == 0 && tm->tm_sec == 0;
+}
diff --git a/src/lib-imap/imap-date.h b/src/lib-imap/imap-date.h
new file mode 100644
index 0000000..b8ea982
--- /dev/null
+++ b/src/lib-imap/imap-date.h
@@ -0,0 +1,25 @@
+#ifndef IMAP_DATE_H
+#define IMAP_DATE_H
+
+/* Parses IMAP date/time string and returns TRUE if the string is valid.
+   time_t is filled with UTC date. timezone_offset is filled with parsed
+   timezone. If no timezone is given, local timezone is assumed.
+
+   If date is too low or too high to fit to time_t, it's set to lowest/highest
+   allowed value. This allows you to use the value directly for comparing
+   timestamps. */
+bool imap_parse_date(const char *str, time_t *timestamp_r);
+bool imap_parse_datetime(const char *str, time_t *timestamp_r,
+			 int *timezone_offset_r);
+
+/* Returns given UTC timestamp as IMAP date-time string in local timezone. */
+const char *imap_to_datetime(time_t timestamp);
+/* Returns given UTC timestamp as IMAP date-time string in given timezone. */
+const char *imap_to_datetime_tz(time_t timestamp, int timezone_offset);
+
+/* Returns TRUE if timestamp was successfully converted to a date,
+   FALSE if time would have been required as well (but the string is still
+   returned). */
+bool imap_to_date(time_t timestamp, const char **str_r);
+
+#endif
diff --git a/src/lib-imap/imap-envelope.c b/src/lib-imap/imap-envelope.c
new file mode 100644
index 0000000..87297f4
--- /dev/null
+++ b/src/lib-imap/imap-envelope.c
@@ -0,0 +1,248 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "istream.h"
+#include "str.h"
+#include "message-address.h"
+#include "message-part-data.h"
+#include "message-parser.h"
+#include "imap-parser.h"
+#include "imap-envelope.h"
+#include "imap-quote.h"
+
+/*
+ * Envelope write
+ */
+
+static void imap_write_address(string_t *str, struct message_address *addr)
+{
+	if (addr == NULL) {
+		str_append(str, "NIL");
+		return;
+	}
+
+	str_append_c(str, '(');
+	while (addr != NULL) {
+		str_append_c(str, '(');
+		if (addr->name == NULL)
+			str_append(str, "NIL");
+		else {
+			imap_append_string_for_humans(str,
+				(const void *)addr->name, strlen(addr->name));
+		}
+		str_append_c(str, ' ');
+		imap_append_nstring(str, addr->route);
+		str_append_c(str, ' ');
+		imap_append_nstring(str, addr->mailbox);
+		str_append_c(str, ' ');
+		imap_append_nstring(str, addr->domain);
+		str_append_c(str, ')');
+
+		addr = addr->next;
+	}
+	str_append_c(str, ')');
+}
+
+void imap_envelope_write(struct message_part_envelope *data,
+				   string_t *str)
+{
+#define NVL(str, nullstr) ((str) != NULL ? (str) : (nullstr))
+	static const char *empty_envelope =
+		"NIL NIL NIL NIL NIL NIL NIL NIL NIL NIL";
+
+	if (data == NULL) {
+		str_append(str, empty_envelope);
+		return;
+	}
+
+	imap_append_nstring_nolf(str, data->date);
+	str_append_c(str, ' ');
+	if (data->subject == NULL)
+		str_append(str, "NIL");
+	else {
+		imap_append_string_for_humans(str,
+			(const unsigned char *)data->subject,
+			strlen(data->subject));
+	}
+
+	str_append_c(str, ' ');
+	imap_write_address(str, data->from);
+	str_append_c(str, ' ');
+	imap_write_address(str, NVL(data->sender, data->from));
+	str_append_c(str, ' ');
+	imap_write_address(str, NVL(data->reply_to, data->from));
+	str_append_c(str, ' ');
+	imap_write_address(str, data->to);
+	str_append_c(str, ' ');
+	imap_write_address(str, data->cc);
+	str_append_c(str, ' ');
+	imap_write_address(str, data->bcc);
+
+	str_append_c(str, ' ');
+	imap_append_nstring_nolf(str, data->in_reply_to);
+	str_append_c(str, ' ');
+	imap_append_nstring_nolf(str, data->message_id);
+}
+
+/*
+ * ENVELOPE parsing
+ */
+
+static bool
+imap_envelope_parse_address(const struct imap_arg *arg,
+	pool_t pool, struct message_address **addr_r)
+{
+	struct message_address *addr;
+	const struct imap_arg *list_args;
+	const char *name, *route, *mailbox, *domain;
+	unsigned int list_count;
+
+	if (!imap_arg_get_list_full(arg, &list_args, &list_count))
+		return FALSE;
+
+	/* we require 4 arguments, strings or NILs */
+	if (list_count < 4)
+		return FALSE;
+
+	if (!imap_arg_get_nstring(&list_args[0], &name))
+		return FALSE;
+	if (!imap_arg_get_nstring(&list_args[1], &route))
+		return FALSE;
+	if (!imap_arg_get_nstring(&list_args[2], &mailbox))
+		return FALSE;
+	if (!imap_arg_get_nstring(&list_args[3], &domain))
+		return FALSE;
+
+	addr = p_new(pool, struct message_address, 1);
+	addr->name = p_strdup(pool, name);
+	addr->route = p_strdup(pool, route);
+	addr->mailbox = p_strdup(pool, mailbox);
+	addr->domain = p_strdup(pool, domain);
+
+	*addr_r = addr;
+	return TRUE;
+}
+
+static bool
+imap_envelope_parse_addresses(const struct imap_arg *arg,
+	pool_t pool, struct message_address **addrs_r)
+{
+	struct message_address *first, *addr, *prev;
+	const struct imap_arg *list_args;
+
+	if (arg->type == IMAP_ARG_NIL) {
+		*addrs_r = NULL;
+		return TRUE;
+	}
+
+	if (!imap_arg_get_list(arg, &list_args))
+		return FALSE;
+
+	first = addr = prev = NULL;
+	for (; !IMAP_ARG_IS_EOL(list_args); list_args++) {
+		if (!imap_envelope_parse_address
+			(list_args, pool, &addr))
+			return FALSE;
+		if (first == NULL)
+			first = addr;
+		if (prev != NULL)
+			prev->next = addr;
+		prev = addr;
+	}
+
+	*addrs_r = first;
+	return TRUE;
+}
+
+bool imap_envelope_parse_args(const struct imap_arg *args,
+	pool_t pool, struct message_part_envelope **envlp_r,
+	const char **error_r)
+{
+	struct message_part_envelope *envlp;
+
+	envlp = p_new(pool, struct message_part_envelope, 1);
+
+	if (!imap_arg_get_nstring(args++, &envlp->date)) {
+		*error_r = "Invalid date field";
+		return FALSE;
+	}
+	envlp->date = p_strdup(pool, envlp->date);
+
+	if (!imap_arg_get_nstring(args++, &envlp->subject)) {
+		*error_r = "Invalid subject field";
+		return FALSE;
+	}
+	envlp->subject = p_strdup(pool, envlp->subject);
+
+	if (!imap_envelope_parse_addresses(args++, pool, &envlp->from)) {
+		*error_r = "Invalid from field";
+		return FALSE;
+	}
+	if (!imap_envelope_parse_addresses(args++, pool, &envlp->sender)) {
+		*error_r = "Invalid sender field";
+		return FALSE;
+	}
+	if (!imap_envelope_parse_addresses(args++, pool, &envlp->reply_to)) {
+		*error_r = "Invalid reply_to field";
+		return FALSE;
+	}
+	if (!imap_envelope_parse_addresses(args++, pool, &envlp->to)) {
+		*error_r = "Invalid to field";
+		return FALSE;
+	}
+	if (!imap_envelope_parse_addresses(args++, pool, &envlp->cc)) {
+		*error_r = "Invalid cc field";
+		return FALSE;
+	}
+	if (!imap_envelope_parse_addresses(args++, pool, &envlp->bcc)) {
+		*error_r = "Invalid bcc field";
+		return FALSE;
+	}
+
+	if (!imap_arg_get_nstring(args++, &envlp->in_reply_to)) {
+		*error_r = "Invalid in_reply_to field";
+		return FALSE;
+	}
+	envlp->in_reply_to = p_strdup(pool, envlp->in_reply_to);
+
+	if (!imap_arg_get_nstring(args++, &envlp->message_id)) {
+		*error_r = "Invalid message_id field";
+		return FALSE;
+	}
+	envlp->message_id = p_strdup(pool, envlp->message_id);
+
+	*envlp_r = envlp;
+	return TRUE;
+}
+
+bool imap_envelope_parse(const char *envelope,
+	pool_t pool, struct message_part_envelope **envlp_r,
+	const char **error_r)
+{
+	struct istream *input;
+	struct imap_parser *parser;
+	const struct imap_arg *args;
+	int ret;
+	bool success;
+
+	input = i_stream_create_from_data(envelope, strlen(envelope));
+	(void)i_stream_read(input);
+
+	parser = imap_parser_create(input, NULL, SIZE_MAX);
+	ret = imap_parser_finish_line(parser, 0,
+				      IMAP_PARSE_FLAG_LITERAL_TYPE, &args);
+	if (ret < 0) {
+		*error_r = t_strdup_printf("IMAP parser failed: %s",
+					   imap_parser_get_error(parser, NULL));
+		success = FALSE;
+	} else if (ret == 0) {
+		*error_r = "Empty envelope";
+		success = FALSE;
+	} else {
+		success = imap_envelope_parse_args(args, pool, envlp_r, error_r);
+	}
+
+	imap_parser_unref(&parser);
+	i_stream_destroy(&input);
+	return success;
+}
diff --git a/src/lib-imap/imap-envelope.h b/src/lib-imap/imap-envelope.h
new file mode 100644
index 0000000..f9e4c0b
--- /dev/null
+++ b/src/lib-imap/imap-envelope.h
@@ -0,0 +1,20 @@
+#ifndef IMAP_ENVELOPE_H
+#define IMAP_ENVELOPE_H
+
+struct imap_arg;
+struct message_part_envelope;
+
+/* Write envelope to given string */
+void imap_envelope_write(struct message_part_envelope *data,
+				   string_t *str);
+
+/* Parse envelope from arguments */
+bool imap_envelope_parse_args(const struct imap_arg *args,
+	pool_t pool, struct message_part_envelope **envlp_r,
+	const char **error_r);
+/* Parse envelope from string */
+bool imap_envelope_parse(const char *envelope,
+	pool_t pool, struct message_part_envelope **envlp_r,
+	const char **error_r);
+
+#endif
diff --git a/src/lib-imap/imap-id.c b/src/lib-imap/imap-id.c
new file mode 100644
index 0000000..f873c57
--- /dev/null
+++ b/src/lib-imap/imap-id.c
@@ -0,0 +1,173 @@
+/* Copyright (c) 2008-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "istream.h"
+#include "imap-parser.h"
+#include "imap-quote.h"
+#include "imap-id.h"
+#include "dovecot-version.h"
+
+#ifdef HAVE_SYS_UTSNAME_H
+#  include <sys/utsname.h>
+#endif
+
+#ifdef HAVE_UNAME
+static struct utsname utsname_result;
+static bool utsname_set = FALSE;
+
+static const char *imap_id_get_uname(const char *key)
+{
+	if (!utsname_set) {
+		utsname_set = TRUE;
+		if (uname(&utsname_result) < 0) {
+			i_error("uname() failed: %m");
+			i_zero(&utsname_result);
+		}
+	}
+
+	if (strcasecmp(key, "os") == 0)
+		return utsname_result.sysname;
+	if (strcasecmp(key, "os-version") == 0)
+		return utsname_result.release;
+	return NULL;
+}
+#endif
+
+static const char *imap_id_get_default(const char *key)
+{
+	if (strcasecmp(key, "name") == 0)
+		return PACKAGE_NAME;
+	if (strcasecmp(key, "version") == 0)
+		return PACKAGE_VERSION;
+	if (strcasecmp(key, "revision") == 0)
+		return DOVECOT_REVISION;
+	if (strcasecmp(key, "support-url") == 0)
+		return PACKAGE_WEBPAGE;
+	if (strcasecmp(key, "support-email") == 0)
+		return PACKAGE_BUGREPORT;
+#ifdef HAVE_UNAME
+	return imap_id_get_uname(key);
+#endif
+}
+
+static const char *
+imap_id_reply_generate_from_imap_args(const struct imap_arg *args)
+{
+	string_t *str;
+	const char *key, *value;
+
+	if (IMAP_ARG_IS_EOL(args))
+		return "NIL";
+
+	str = t_str_new(256);
+	str_append_c(str, '(');
+	for (; !IMAP_ARG_IS_EOL(args); args++) {
+		if (!imap_arg_get_astring(args, &key)) {
+			/* broken input */
+			if (IMAP_ARG_IS_EOL(&args[1]))
+				break;
+			args++;
+		} else {
+			/* key */
+			if (str_len(str) > 1)
+				str_append_c(str, ' ');
+			imap_append_quoted(str, key);
+			str_append_c(str, ' ');
+			/* value */
+			if (IMAP_ARG_IS_EOL(&args[1])) {
+				str_append(str, "NIL");
+				break;
+			}
+			args++;
+			if (!imap_arg_get_astring(args, &value))
+				value = NULL;
+			else {
+				if (strcmp(value, "*") == 0)
+					value = imap_id_get_default(key);
+			}
+			imap_append_nstring(str, value);
+		}
+	}
+	if (str_len(str) == 1) {
+		/* broken */
+		return "NIL";
+	}
+	str_append_c(str, ')');
+	return str_c(str);
+}
+
+const char *imap_id_reply_generate(const char *settings)
+{
+	struct istream *input;
+	struct imap_parser *parser;
+	const struct imap_arg *args;
+	const char *ret;
+
+	if (settings == NULL)
+		return "NIL";
+
+	input = i_stream_create_from_data(settings, strlen(settings));
+	(void)i_stream_read(input);
+
+	parser = imap_parser_create(input, NULL, SIZE_MAX);
+	if (imap_parser_finish_line(parser, 0, 0, &args) <= 0)
+		ret = "NIL";
+	else
+		ret = imap_id_reply_generate_from_imap_args(args);
+
+	imap_parser_unref(&parser);
+	i_stream_destroy(&input);
+	return ret;
+}
+
+void imap_id_log_reply_append(string_t *reply, const char *key,
+			      const char *value)
+{
+	if (str_len(reply) > 0)
+		str_append(reply, ", ");
+	str_append(reply, str_sanitize(key, IMAP_ID_KEY_MAX_LEN));
+	str_append_c(reply, '=');
+	str_append(reply, value == NULL ? "NIL" : str_sanitize(value, 80));
+}
+
+const char *imap_id_args_get_log_reply(const struct imap_arg *args,
+				       const char *settings)
+{
+	const char *const *keys, *key, *value;
+	string_t *reply;
+	bool log_all;
+
+	if (settings == NULL || *settings == '\0')
+		return NULL;
+	if (!imap_arg_get_list(args, &args))
+		return NULL;
+
+	log_all = strcmp(settings, "*") == 0;
+	reply = t_str_new(256);
+	keys = t_strsplit_spaces(settings, " ");
+	while (!IMAP_ARG_IS_EOL(&args[0]) &&
+	       !IMAP_ARG_IS_EOL(&args[1])) {
+		if (!imap_arg_get_string(args, &key)) {
+			/* broken input */
+			args += 2;
+			continue;
+		}
+		args++;
+		if (strlen(key) > 30) {
+			/* broken: ID spec requires fields to be max. 30
+			   octets */
+			args++;
+			continue;
+		}
+
+		if (log_all || str_array_icase_find(keys, key)) {
+			if (!imap_arg_get_nstring(args, &value))
+				value = "";
+			imap_id_log_reply_append(reply, key, value);
+		}
+		args++;
+	}
+	return str_len(reply) == 0 ? NULL : str_c(reply);
+}
diff --git a/src/lib-imap/imap-id.h b/src/lib-imap/imap-id.h
new file mode 100644
index 0000000..853153a
--- /dev/null
+++ b/src/lib-imap/imap-id.h
@@ -0,0 +1,19 @@
+#ifndef IMAP_ID_H
+#define IMAP_ID_H
+
+struct imap_arg;
+
+/* RFC 2971 says keys are max. 30 octets */
+#define IMAP_ID_KEY_MAX_LEN 30
+
+/* Return ID reply based on given settings. */
+const char *imap_id_reply_generate(const char *settings);
+/* Return a line that should be logged based on given args and settings.
+   Returns NULL if nothing should be logged. */
+const char *imap_id_args_get_log_reply(const struct imap_arg *args,
+				       const char *settings);
+/* Append [, ]key=value to the reply sanitized. */
+void imap_id_log_reply_append(string_t *reply, const char *key,
+			      const char *value);
+
+#endif
diff --git a/src/lib-imap/imap-keepalive.c b/src/lib-imap/imap-keepalive.c
new file mode 100644
index 0000000..0756ce8
--- /dev/null
+++ b/src/lib-imap/imap-keepalive.c
@@ -0,0 +1,47 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "crc32.h"
+#include "net.h"
+#include "imap-keepalive.h"
+
+#include <time.h>
+
+static bool imap_remote_ip_is_usable(const struct ip_addr *ip)
+{
+	unsigned int addr;
+
+	if (ip->family == 0)
+		return FALSE;
+	if (ip->family == AF_INET) {
+#define IP4(a,b,c,d) ((unsigned)(a)<<24|(unsigned)(b)<<16|(unsigned)(c)<<8|(unsigned)(d))
+		addr = ip->u.ip4.s_addr;
+		if (addr >= IP4(10,0,0,0) && addr <= IP4(10,255,255,255))
+			return FALSE; /* 10/8 */
+		if (addr >= IP4(192,168,0,0) && addr <= IP4(192,168,255,255))
+			return FALSE; /* 192.168/16 */
+		if (addr >= IP4(172,16,0,0) && addr <= IP4(172,31,255,255))
+			return FALSE; /* 172.16/12 */
+		if (addr >= IP4(127,0,0,0) && addr <= IP4(127,255,255,255))
+			return FALSE; /* 127/8 */
+#undef IP4
+	}
+	else if (ip->family == AF_INET6) {
+		addr = ip->u.ip6.s6_addr[0];
+		if (addr == 0xfc || addr == 0xfd)
+			return FALSE; /* fc00::/7 */
+	}
+	return TRUE;
+}
+
+unsigned int
+imap_keepalive_interval_msecs(const char *username, const struct ip_addr *ip,
+			      unsigned int interval_secs)
+{
+	unsigned int client_hash;
+
+	client_hash = ip != NULL && imap_remote_ip_is_usable(ip) ?
+		net_ip_hash(ip) : crc32_str(username);
+	interval_secs -= (time(NULL) + client_hash) % interval_secs;
+	return interval_secs * 1000;
+}
diff --git a/src/lib-imap/imap-keepalive.h b/src/lib-imap/imap-keepalive.h
new file mode 100644
index 0000000..238cdbd
--- /dev/null
+++ b/src/lib-imap/imap-keepalive.h
@@ -0,0 +1,24 @@
+#ifndef IMAP_KEEPALIVE_H
+#define IMAP_KEEPALIVE_H
+
+/* This function can be used to set IMAP IDLE keepalive notification timeout
+   interval so that the client gets the keepalive notifications at exactly the
+   same time for all the IMAP connections. This helps to reduce battery usage
+   in mobile devices.
+
+   One problem with this is that we don't really want to send the notifications
+   to everyone at the same time, because it would cause huge peaks of activity.
+   Basing the notifications on the username works well for one account, but
+   basing it on the IP address allows the client to get all of the
+   notifications at the same time for multiple accounts as well (of course
+   assuming Dovecot is running on all the servers :)
+
+   One potential downside to using IP is that if a proxy hides the client's IP
+   address, the notifications are sent to everyone at the same time. This can
+   be avoided by using a properly configured Dovecot proxy, but we'll also try
+   to avoid this by not doing it for the commonly used intranet IP ranges. */
+unsigned int
+imap_keepalive_interval_msecs(const char *username, const struct ip_addr *ip,
+			      unsigned int interval_secs);
+
+#endif
diff --git a/src/lib-imap/imap-match.c b/src/lib-imap/imap-match.c
new file mode 100644
index 0000000..8603e00
--- /dev/null
+++ b/src/lib-imap/imap-match.c
@@ -0,0 +1,382 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+/* imap_match_init() logic originates from Cyrus, but the code is fully
+   rewritten. */
+
+#include "lib.h"
+#include "array.h"
+#include "imap-match.h"
+
+#include <ctype.h>
+
+struct imap_match_pattern {
+	const char *pattern;
+	bool inboxcase;
+};
+
+struct imap_match_glob {
+	pool_t pool;
+
+	struct imap_match_pattern *patterns;
+
+	char sep;
+	char patterns_data[FLEXIBLE_ARRAY_MEMBER];
+};
+
+struct imap_match_context {
+	const char *inboxcase_end;
+
+	char sep;
+	bool inboxcase;
+};
+
+/* name of "INBOX" - must not have repeated substrings */
+static const char inbox[] = "INBOX";
+#define INBOXLEN (sizeof(inbox) - 1)
+
+struct imap_match_glob *
+imap_match_init(pool_t pool, const char *pattern,
+		bool inboxcase, char separator)
+{
+	const char *patterns[2];
+
+	patterns[0] = pattern;
+	patterns[1] = NULL;
+	return imap_match_init_multiple(pool, patterns, inboxcase, separator);
+}
+
+static const char *pattern_compress(const char *pattern)
+{
+	char *dest, *ret;
+
+	dest = ret = t_strdup_noconst(pattern);
+
+	/* @UNSAFE: compress the pattern */
+	while (*pattern != '\0') {
+		if (*pattern == '*' || *pattern == '%') {
+			/* remove duplicate hierarchy wildcards */
+			while (*pattern == '%') pattern++;
+
+			/* "%*" -> "*" */
+			if (*pattern == '*') {
+				/* remove duplicate wildcards */
+				while (*pattern == '*' || *pattern == '%')
+					pattern++;
+				*dest++ = '*';
+			} else {
+				*dest++ = '%';
+			}
+		} else {
+			*dest++ = *pattern++;
+		}
+	}
+	*dest = '\0';
+	return ret;
+}
+
+static bool pattern_is_inboxcase(const char *pattern, char separator)
+{
+	const char *p = pattern, *inboxp = inbox;
+
+	/* skip over exact matches */
+	while (*inboxp == i_toupper(*p) && *p != '\0') {
+		inboxp++; p++;
+	}
+	if (*p != '%') {
+		return *p == '*' || *p == separator ||
+			(*inboxp == '\0' && *p == '\0');
+	}
+
+	/* handle 'I%B%X' style checks */
+	for (; *p != '\0' && *p != '*' && *p != separator; p++) {
+		if (*p != '%') {
+			inboxp = strchr(inboxp, i_toupper(*p));
+			if (inboxp == NULL)
+				return FALSE;
+
+			if (*++inboxp == '\0') {
+				/* now check that it doesn't end with
+				   any invalid chars */
+				if (*++p == '%') p++;
+				if (*p != '\0' && *p != '*' &&
+				    *p != separator)
+					return FALSE;
+				break;
+			}
+		}
+	}
+	return TRUE;
+}
+
+static struct imap_match_glob *
+imap_match_init_multiple_real(pool_t pool, const char *const *patterns,
+			      bool inboxcase, char separator)
+{
+	struct imap_match_glob *glob;
+	struct imap_match_pattern *match_patterns;
+	unsigned int i, patterns_count;
+	size_t len, pos, patterns_data_len = 0;
+
+	patterns_count = str_array_length(patterns);
+	match_patterns = p_new(pool, struct imap_match_pattern,
+			       patterns_count + 1);
+
+	/* compress the patterns */
+	for (i = 0; i < patterns_count; i++) {
+		match_patterns[i].pattern = pattern_compress(patterns[i]);
+		match_patterns[i].inboxcase = inboxcase &&
+			pattern_is_inboxcase(match_patterns[i].pattern,
+					     separator);
+
+		patterns_data_len += strlen(match_patterns[i].pattern) + 1;
+	}
+	patterns_count = i;
+
+	/* now we know how much memory we need */
+	glob = p_malloc(pool, sizeof(struct imap_match_glob) +
+			patterns_data_len);
+	glob->pool = pool;
+	glob->sep = separator;
+
+	/* copy pattern strings to our allocated memory */
+	for (i = 0, pos = 0; i < patterns_count; i++) {
+		len = strlen(match_patterns[i].pattern) + 1;
+		i_assert(pos + len <= patterns_data_len);
+
+		/* @UNSAFE */
+		memcpy(glob->patterns_data + pos,
+		       match_patterns[i].pattern, len);
+		match_patterns[i].pattern = glob->patterns_data + pos;
+		pos += len;
+	}
+	glob->patterns = match_patterns;
+	return glob;
+}
+
+struct imap_match_glob *
+imap_match_init_multiple(pool_t pool, const char *const *patterns,
+			 bool inboxcase, char separator)
+{
+	struct imap_match_glob *glob;
+
+	if (pool->datastack_pool) {
+		return imap_match_init_multiple_real(pool, patterns,
+						     inboxcase, separator);
+	}
+	T_BEGIN {
+		glob = imap_match_init_multiple_real(pool, patterns,
+						     inboxcase, separator);
+	} T_END;
+	return glob;
+}
+
+void imap_match_deinit(struct imap_match_glob **glob)
+{
+	if (glob == NULL || *glob == NULL)
+		return;
+	p_free((*glob)->pool, (*glob)->patterns);
+	p_free((*glob)->pool, *glob);
+	*glob = NULL;
+}
+
+static struct imap_match_glob *
+imap_match_dup_real(pool_t pool, const struct imap_match_glob *glob)
+{
+	ARRAY_TYPE(const_string) patterns;
+	const struct imap_match_pattern *p;
+	bool inboxcase = FALSE;
+
+	t_array_init(&patterns, 8);
+	for (p = glob->patterns; p->pattern != NULL; p++) {
+		if (p->inboxcase)
+			inboxcase = TRUE;
+		array_push_back(&patterns, &p->pattern);
+	}
+	array_append_zero(&patterns);
+	return imap_match_init_multiple_real(pool, array_front(&patterns),
+					     inboxcase, glob->sep);
+}
+
+struct imap_match_glob *
+imap_match_dup(pool_t pool, const struct imap_match_glob *glob)
+{
+	struct imap_match_glob *new_glob;
+
+	if (pool->datastack_pool) {
+		return imap_match_dup_real(pool, glob);
+	} else {
+		T_BEGIN {
+			new_glob = imap_match_dup_real(pool, glob);
+		} T_END;
+		return new_glob;
+	}
+}
+
+bool imap_match_globs_equal(const struct imap_match_glob *glob1,
+			    const struct imap_match_glob *glob2)
+{
+	const struct imap_match_pattern *p1 = glob1->patterns;
+	const struct imap_match_pattern *p2 = glob2->patterns;
+
+	if (glob1->sep != glob2->sep)
+		return FALSE;
+
+	for (; p1->pattern != NULL && p2->pattern != NULL; p1++, p2++) {
+		if (strcmp(p1->pattern, p2->pattern) != 0)
+			return FALSE;
+		if (p1->inboxcase != p2->inboxcase)
+			return FALSE;
+	}
+	return p1->pattern == p2->pattern;
+}
+
+#define CMP_CUR_CHR(ctx, data, pattern) \
+	(*(data) == *(pattern) || \
+	 (i_toupper(*(data)) == i_toupper(*(pattern)) && \
+	 (data) < (ctx)->inboxcase_end))
+
+static enum imap_match_result
+match_sub(struct imap_match_context *ctx, const char **data_p,
+	  const char **pattern_p)
+{
+	enum imap_match_result ret, match;
+	unsigned int i;
+	const char *data = *data_p, *pattern = *pattern_p;
+
+	/* match all non-wildcards */
+	i = 0;
+	while (pattern[i] != '\0' && pattern[i] != '*' && pattern[i] != '%') {
+		if (!CMP_CUR_CHR(ctx, data+i, pattern+i)) {
+			if (data[i] != '\0')
+				return IMAP_MATCH_NO;
+			if (pattern[i] == ctx->sep)
+				return IMAP_MATCH_CHILDREN;
+			if (i > 0 && pattern[i-1] == ctx->sep) {
+				/* data="foo/" pattern = "foo/bar/%" */
+				return IMAP_MATCH_CHILDREN;
+			}
+			return IMAP_MATCH_NO;
+		}
+		i++;
+	}
+	data += i;
+	pattern += i;
+
+	if (*data == '\0' && *data_p != data && data[-1] == ctx->sep &&
+	    *pattern != '\0') {
+		/* data="/" pattern="/%..." */
+		match = IMAP_MATCH_CHILDREN;
+	} else {
+		match = IMAP_MATCH_NO;
+	}
+	while (*pattern == '%') {
+		pattern++;
+
+		if (*pattern == '\0') {
+			/* match, if this is the last hierarchy */
+			while (*data != '\0' && *data != ctx->sep)
+				data++;
+			break;
+		}
+
+		/* skip over this hierarchy */
+		while (*data != '\0') {
+			if (CMP_CUR_CHR(ctx, data, pattern)) {
+				ret = match_sub(ctx, &data, &pattern);
+				if (ret == IMAP_MATCH_YES)
+					break;
+
+				match |= ret;
+			}
+
+			if (*data == ctx->sep)
+				break;
+
+			data++;
+		}
+	}
+
+	if (*pattern != '*') {
+		if (*data == '\0' && *pattern != '\0') {
+			if (*pattern == ctx->sep)
+				match |= IMAP_MATCH_CHILDREN;
+			return match;
+		}
+
+		if (*data != '\0') {
+			if (*pattern == '\0' && *data == ctx->sep)
+				match |= IMAP_MATCH_PARENT;
+			return match;
+		}
+	}
+
+	*data_p = data;
+	*pattern_p = pattern;
+	return IMAP_MATCH_YES;
+}
+
+static enum imap_match_result
+imap_match_pattern(struct imap_match_context *ctx,
+		   const char *data, const char *pattern)
+{
+	enum imap_match_result ret, match;
+
+	ctx->inboxcase_end = data;
+	if (ctx->inboxcase && strncasecmp(data, inbox, INBOXLEN) == 0 &&
+	    (data[INBOXLEN] == '\0' || data[INBOXLEN] == ctx->sep)) {
+		/* data begins with INBOX/, use case-insensitive comparison
+		   for it */
+		ctx->inboxcase_end += INBOXLEN;
+	}
+
+	if (*pattern != '*') {
+		/* handle the pattern up to the first '*' */
+		ret = match_sub(ctx, &data, &pattern);
+		if (ret != IMAP_MATCH_YES || *pattern == '\0')
+			return ret;
+	}
+
+	match = IMAP_MATCH_CHILDREN;
+	while (*pattern == '*') {
+		pattern++;
+
+		if (*pattern == '\0')
+			return IMAP_MATCH_YES;
+
+		while (*data != '\0') {
+			if (CMP_CUR_CHR(ctx, data, pattern)) {
+				ret = match_sub(ctx, &data, &pattern);
+				if (ret == IMAP_MATCH_YES)
+					break;
+				match |= ret;
+			}
+
+			data++;
+		}
+	}
+
+	return *data == '\0' && *pattern == '\0' ?
+		IMAP_MATCH_YES : match;
+}
+
+enum imap_match_result
+imap_match(struct imap_match_glob *glob, const char *data)
+{
+	struct imap_match_context ctx;
+	unsigned int i;
+	enum imap_match_result ret, match;
+
+	match = IMAP_MATCH_NO;
+	ctx.sep = glob->sep;
+	for (i = 0; glob->patterns[i].pattern != NULL; i++) {
+		ctx.inboxcase = glob->patterns[i].inboxcase;
+
+		ret = imap_match_pattern(&ctx, data, glob->patterns[i].pattern);
+		if (ret == IMAP_MATCH_YES)
+			return IMAP_MATCH_YES;
+
+		match |= ret;
+	}
+
+	return match;
+}
diff --git a/src/lib-imap/imap-match.h b/src/lib-imap/imap-match.h
new file mode 100644
index 0000000..f2e5b51
--- /dev/null
+++ b/src/lib-imap/imap-match.h
@@ -0,0 +1,42 @@
+#ifndef IMAP_MATCH_H
+#define IMAP_MATCH_H
+
+enum imap_match_result {
+	IMAP_MATCH_NO 		= 0x00, /* definite non-match */
+	IMAP_MATCH_YES		= 0x01, /* match */
+
+	/* YES and NO are returned alone, but CHILDREN and PARENT may be
+	   returned both (eg. "foo*bar" vs. "foobar/baz") */
+
+	/* non-match, but its children could match (eg. "box" vs "box/%") */
+	IMAP_MATCH_CHILDREN	= 0x02,
+	/* non-match, but one of its parents does match. This should often be
+	   handled with YES matches, because when listing for "%" and "box/foo"
+	   exists but "box" doesn't, you should still list "box" as
+	   (Nonexistent HasChildren) mailbox. */
+	IMAP_MATCH_PARENT	= 0x04
+};
+
+struct imap_match_glob;
+
+/* If inboxcase is TRUE, the "INBOX" string at the beginning of line is
+   compared case-insensitively */
+struct imap_match_glob *
+imap_match_init(pool_t pool, const char *pattern,
+		bool inboxcase, char separator);
+struct imap_match_glob *
+imap_match_init_multiple(pool_t pool, const char *const *patterns,
+			 bool inboxcase, char separator);
+void imap_match_deinit(struct imap_match_glob **glob);
+
+struct imap_match_glob *
+imap_match_dup(pool_t pool, const struct imap_match_glob *glob);
+/* Returns TRUE if two globs were created with same init() parameters
+   (but inboxcase is ignored if no patterns can match INBOX) */
+bool imap_match_globs_equal(const struct imap_match_glob *glob1,
+			    const struct imap_match_glob *glob2);
+
+enum imap_match_result
+imap_match(struct imap_match_glob *glob, const char *data);
+
+#endif
diff --git a/src/lib-imap/imap-parser.c b/src/lib-imap/imap-parser.c
new file mode 100644
index 0000000..2deb75f
--- /dev/null
+++ b/src/lib-imap/imap-parser.c
@@ -0,0 +1,1023 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "istream.h"
+#include "ostream.h"
+#include "strescape.h"
+#include "imap-parser.h"
+
+/* We use this macro to read atoms from input. It should probably contain
+   everything some day, but for now we can't handle some input otherwise:
+
+   ']' is required for parsing section (FETCH BODY[])
+   '%', '*' and ']' are valid list-chars for LIST patterns
+   '\' is used in flags */
+#define IS_ATOM_PARSER_INPUT(c) \
+	((c) == '(' || (c) == ')' || (c) == '{' || \
+	 (c) == '"' || (c) <= 32 || (c) == 0x7f)
+
+#define is_linebreak(c) \
+	((c) == '\r' || (c) == '\n')
+
+#define LIST_INIT_COUNT 7
+
+enum arg_parse_type {
+	ARG_PARSE_NONE = 0,
+	ARG_PARSE_ATOM,
+	ARG_PARSE_STRING,
+	ARG_PARSE_LITERAL,
+	ARG_PARSE_LITERAL8,
+	ARG_PARSE_LITERAL_DATA,
+	ARG_PARSE_LITERAL_DATA_FORCED,
+	ARG_PARSE_TEXT
+};
+
+struct imap_parser {
+	/* permanent */
+	int refcount;
+	pool_t pool;
+	struct istream *input;
+	struct ostream *output;
+	size_t max_line_size;
+        enum imap_parser_flags flags;
+
+	/* reset by imap_parser_reset(): */
+	size_t line_size;
+	ARRAY_TYPE(imap_arg_list) root_list;
+        ARRAY_TYPE(imap_arg_list) *cur_list;
+	struct imap_arg *list_arg;
+
+	enum arg_parse_type cur_type;
+	size_t cur_pos; /* parser position in input buffer */
+	bool cur_resp_text; /* we're parsing [resp-text-code] */
+
+	int str_first_escape; /* ARG_PARSE_STRING: index to first '\' */
+	uoff_t literal_size; /* ARG_PARSE_LITERAL: string size */
+
+	enum imap_parser_error error;
+	const char *error_msg;
+
+	bool literal_minus:1;
+	bool literal_skip_crlf:1;
+	bool literal_nonsync:1;
+	bool literal8:1;
+	bool literal_size_return:1;
+	bool eol:1;
+	bool args_added_extra_eol:1;
+	bool fatal_error:1;
+};
+
+struct imap_parser *
+imap_parser_create(struct istream *input, struct ostream *output,
+		   size_t max_line_size)
+{
+	struct imap_parser *parser;
+
+	parser = i_new(struct imap_parser, 1);
+	parser->refcount = 1;
+	parser->pool = pool_alloconly_create(MEMPOOL_GROWING"IMAP parser",
+					     1024);
+	parser->input = input;
+	parser->output = output;
+	parser->max_line_size = max_line_size;
+
+	p_array_init(&parser->root_list, parser->pool, LIST_INIT_COUNT);
+	parser->cur_list = &parser->root_list;
+	return parser;
+}
+
+void imap_parser_ref(struct imap_parser *parser)
+{
+	i_assert(parser->refcount > 0);
+
+	parser->refcount++;
+}
+
+void imap_parser_unref(struct imap_parser **_parser)
+{
+	struct imap_parser *parser = *_parser;
+
+	*_parser = NULL;
+
+	i_assert(parser->refcount > 0);
+	if (--parser->refcount > 0)
+		return;
+
+	pool_unref(&parser->pool);
+	i_free(parser);
+}
+
+void imap_parser_enable_literal_minus(struct imap_parser *parser)
+{
+	parser->literal_minus = TRUE;
+}
+
+void imap_parser_reset(struct imap_parser *parser)
+{
+	p_clear(parser->pool);
+
+	parser->line_size = 0;
+
+	p_array_init(&parser->root_list, parser->pool, LIST_INIT_COUNT);
+	parser->cur_list = &parser->root_list;
+	parser->list_arg = NULL;
+
+	parser->cur_type = ARG_PARSE_NONE;
+	parser->cur_pos = 0;
+	parser->cur_resp_text = FALSE;
+
+	parser->str_first_escape = 0;
+	parser->literal_size = 0;
+
+	parser->error = IMAP_PARSE_ERROR_NONE;
+	parser->error_msg = NULL;
+
+	parser->literal_skip_crlf = FALSE;
+	parser->eol = FALSE;
+	parser->args_added_extra_eol = FALSE;
+	parser->literal_size_return = FALSE;
+}
+
+void imap_parser_set_streams(struct imap_parser *parser, struct istream *input,
+			     struct ostream *output)
+{
+	parser->input = input;
+	parser->output = output;
+}
+
+const char *imap_parser_get_error(struct imap_parser *parser,
+	enum imap_parser_error *error_r)
+{
+	if (error_r != NULL)
+		*error_r = parser->error;
+	return parser->error_msg;
+}
+
+/* skip over everything parsed so far, plus the following whitespace */
+static bool imap_parser_skip_to_next(struct imap_parser *parser,
+				     const unsigned char **data,
+				     size_t *data_size)
+{
+	size_t i;
+
+	for (i = parser->cur_pos; i < *data_size; i++) {
+		if ((*data)[i] != ' ')
+			break;
+	}
+
+	parser->line_size += i;
+        i_stream_skip(parser->input, i);
+	parser->cur_pos = 0;
+
+	*data += i;
+	*data_size -= i;
+	return *data_size > 0;
+}
+
+static struct imap_arg *imap_arg_create(struct imap_parser *parser)
+{
+	struct imap_arg *arg;
+
+	arg = array_append_space(parser->cur_list);
+	arg->parent = parser->list_arg;
+	return arg;
+}
+
+static void imap_parser_open_list(struct imap_parser *parser)
+{
+	parser->list_arg = imap_arg_create(parser);
+	parser->list_arg->type = IMAP_ARG_LIST;
+	p_array_init(&parser->list_arg->_data.list, parser->pool,
+		     LIST_INIT_COUNT);
+	parser->cur_list = &parser->list_arg->_data.list;
+
+	parser->cur_type = ARG_PARSE_NONE;
+}
+
+static bool imap_parser_close_list(struct imap_parser *parser)
+{
+	struct imap_arg *arg;
+
+	if (parser->list_arg == NULL) {
+		/* we're not inside list */
+		if ((parser->flags & IMAP_PARSE_FLAG_INSIDE_LIST) != 0) {
+			parser->eol = TRUE;
+			parser->cur_type = ARG_PARSE_NONE;
+			return TRUE;
+		}
+		parser->error_msg = "Unexpected ')'";
+		parser->error = IMAP_PARSE_ERROR_BAD_SYNTAX;
+		return FALSE;
+	}
+
+	arg = imap_arg_create(parser);
+	arg->type = IMAP_ARG_EOL;
+
+	parser->list_arg = parser->list_arg->parent;
+	if (parser->list_arg == NULL) {
+		parser->cur_list = &parser->root_list;
+	} else {
+		parser->cur_list = &parser->list_arg->_data.list;
+	}
+
+	parser->cur_type = ARG_PARSE_NONE;
+	return TRUE;
+}
+
+static char *
+imap_parser_strdup(struct imap_parser *parser,
+		   const void *data, size_t len)
+{
+	char *ret;
+
+	ret = p_malloc(parser->pool, len + 1);
+	memcpy(ret, data, len);
+	return ret;
+}
+
+static void imap_parser_save_arg(struct imap_parser *parser,
+				 const unsigned char *data, size_t size)
+{
+	struct imap_arg *arg;
+	char *str;
+
+	arg = imap_arg_create(parser);
+
+	switch (parser->cur_type) {
+	case ARG_PARSE_ATOM:
+	case ARG_PARSE_TEXT:
+		if (size == 3 && i_memcasecmp(data, "NIL", 3) == 0) {
+			/* NIL argument. it might be an actual NIL, but if
+			   we're reading astring, it's an atom and we can't
+			   lose its case. */
+			arg->type = IMAP_ARG_NIL;
+		} else {
+			/* simply save the string */
+			arg->type = IMAP_ARG_ATOM;
+		}
+		arg->_data.str = imap_parser_strdup(parser, data, size);
+		arg->str_len = size;
+		break;
+	case ARG_PARSE_STRING:
+		/* data is quoted and may contain escapes. */
+		i_assert(size > 0);
+
+		arg->type = IMAP_ARG_STRING;
+		str = p_strndup(parser->pool, data+1, size-1);
+
+		/* remove the escapes */
+		if (parser->str_first_escape >= 0 &&
+		    (parser->flags & IMAP_PARSE_FLAG_NO_UNESCAPE) == 0)
+			(void)str_unescape(str);
+		arg->_data.str = str;
+		arg->str_len = strlen(str);
+		break;
+	case ARG_PARSE_LITERAL_DATA:
+		if ((parser->flags & IMAP_PARSE_FLAG_LITERAL_SIZE) != 0) {
+			/* save literal size */
+			arg->type = parser->literal_nonsync ?
+				IMAP_ARG_LITERAL_SIZE_NONSYNC :
+				IMAP_ARG_LITERAL_SIZE;
+			arg->_data.literal_size = parser->literal_size;
+			arg->literal8 = parser->literal8;
+			break;
+		}
+		/* fall through */
+	case ARG_PARSE_LITERAL_DATA_FORCED:
+		if ((parser->flags & IMAP_PARSE_FLAG_LITERAL_TYPE) != 0)
+			arg->type = IMAP_ARG_LITERAL;
+		else
+			arg->type = IMAP_ARG_STRING;
+		arg->_data.str = imap_parser_strdup(parser, data, size);
+		arg->literal8 = parser->literal8;
+		arg->str_len = size;
+		break;
+	default:
+                i_unreached();
+	}
+
+	parser->cur_type = ARG_PARSE_NONE;
+}
+
+static bool is_valid_atom_char(struct imap_parser *parser, char chr)
+{
+	const char *error_msg;
+
+	if (IS_ATOM_PARSER_INPUT((unsigned char)chr))
+		error_msg = "Invalid characters in atom";
+	else if ((((unsigned char)chr) & 0x80) != 0)
+		error_msg = "8bit data in atom";
+	else
+		return TRUE;
+
+	if ((parser->flags & IMAP_PARSE_FLAG_ATOM_ALLCHARS) != 0)
+		return TRUE;
+	parser->error = IMAP_PARSE_ERROR_BAD_SYNTAX;
+	parser->error_msg = error_msg;
+	return FALSE;
+}
+
+static bool imap_parser_read_atom(struct imap_parser *parser,
+				  const unsigned char *data, size_t data_size)
+{
+	size_t i;
+
+	/* read until we've found space, CR or LF. */
+	for (i = parser->cur_pos; i < data_size; i++) {
+		if (data[i] == ' ' || is_linebreak(data[i])) {
+			imap_parser_save_arg(parser, data, i);
+			break;
+		} else if (data[i] == ')') {
+			if (parser->list_arg != NULL ||
+			    (parser->flags & IMAP_PARSE_FLAG_INSIDE_LIST) != 0) {
+				imap_parser_save_arg(parser, data, i);
+				break;
+			} else if ((parser->flags &
+				    IMAP_PARSE_FLAG_ATOM_ALLCHARS) == 0) {
+				parser->error = IMAP_PARSE_ERROR_BAD_SYNTAX;
+				parser->error_msg = "Unexpected ')'";
+				return FALSE;
+			}
+			/* assume it's part of the atom */
+		} else if (!is_valid_atom_char(parser, data[i]))
+			return FALSE;
+	}
+
+	parser->cur_pos = i;
+	return parser->cur_type == ARG_PARSE_NONE;
+}
+
+static bool imap_parser_read_string(struct imap_parser *parser,
+				    const unsigned char *data, size_t data_size)
+{
+	size_t i;
+
+	/* read until we've found non-escaped ", CR or LF */
+	for (i = parser->cur_pos; i < data_size; i++) {
+		if (data[i] == '"') {
+			imap_parser_save_arg(parser, data, i);
+
+			i++; /* skip the trailing '"' too */
+			break;
+		}
+
+		if (data[i] == '\0') {
+			parser->error = IMAP_PARSE_ERROR_BAD_SYNTAX;
+			parser->error_msg = "NULs not allowed in strings";
+			return FALSE;
+		}
+
+		if (data[i] == '\\') {
+			if (i+1 == data_size) {
+				/* known data ends with '\' - leave it to
+				   next time as well if it happens to be \" */
+				break;
+			}
+
+			/* save the first escaped char */
+			if (parser->str_first_escape < 0)
+				parser->str_first_escape = i;
+
+			/* skip the escaped char */
+			i++;
+		}
+
+		/* check linebreaks here, so escaping CR/LF isn't possible.
+		   string always ends with '"', so it's an error if we found
+		   a linebreak.. */
+		if (is_linebreak(data[i]) &&
+		    (parser->flags & IMAP_PARSE_FLAG_MULTILINE_STR) == 0) {
+			parser->error = IMAP_PARSE_ERROR_BAD_SYNTAX;
+			parser->error_msg = "Missing '\"'";
+			return FALSE;
+		}
+	}
+
+	parser->cur_pos = i;
+	return parser->cur_type == ARG_PARSE_NONE;
+}
+
+static bool imap_parser_literal_end(struct imap_parser *parser)
+{
+	if (parser->literal_minus && parser->literal_nonsync &&
+		parser->literal_size > 4096) {
+		parser->error_msg = "Non-synchronizing literal size too large";
+		parser->error = IMAP_PARSE_ERROR_LITERAL_TOO_BIG;
+		return FALSE;
+	}
+
+	if ((parser->flags & IMAP_PARSE_FLAG_LITERAL_SIZE) == 0) {
+		if (parser->line_size >= parser->max_line_size ||
+		    parser->literal_size >
+		    parser->max_line_size - parser->line_size) {
+			/* too long string, abort. */
+			parser->error = IMAP_PARSE_ERROR_LITERAL_TOO_BIG;
+			parser->error_msg = "Literal size too large";
+			return FALSE;
+		}
+
+		if (parser->output != NULL && !parser->literal_nonsync) {
+			o_stream_nsend(parser->output, "+ OK\r\n", 6);
+			if (o_stream_is_corked(parser->output)) {
+				/* make sure this continuation is sent to the
+				   client as soon as possible */
+				o_stream_uncork(parser->output);
+				o_stream_cork(parser->output);
+			}
+		}
+	}
+
+	parser->cur_type = ARG_PARSE_LITERAL_DATA;
+	parser->literal_skip_crlf = TRUE;
+
+	parser->cur_pos = 0;
+	return TRUE;
+}
+
+static bool imap_parser_read_literal(struct imap_parser *parser,
+				     const unsigned char *data,
+				     size_t data_size)
+{
+	size_t i;
+
+	/* expecting digits + "}" */
+	for (i = parser->cur_pos; i < data_size; i++) {
+		if (data[i] == '}') {
+			parser->line_size += i+1;
+			i_stream_skip(parser->input, i+1);
+			return imap_parser_literal_end(parser);
+		}
+
+		if (parser->literal_nonsync) {
+			parser->error = IMAP_PARSE_ERROR_BAD_SYNTAX;
+			parser->error_msg = "Expecting '}' after '+'";
+			return FALSE;
+		}
+
+		if (data[i] == '+') {
+			parser->literal_nonsync = TRUE;
+			continue;
+		}
+
+		if (data[i] < '0' || data[i] > '9') {
+			parser->error = IMAP_PARSE_ERROR_BAD_SYNTAX;
+			parser->error_msg = "Invalid literal size";
+			return FALSE;
+		}
+
+		if (parser->literal_size >= ((uoff_t)-1 / 10)) {
+			if (parser->literal_size > ((uoff_t)-1 / 10) ||
+			    (uoff_t)(data[i] - '0') > ((uoff_t)-1 % 10)) {
+				parser->error = IMAP_PARSE_ERROR_LITERAL_TOO_BIG;
+				parser->error_msg = "Literal size too large";
+				return FALSE;
+			}
+		}
+		parser->literal_size = parser->literal_size * 10 +
+			(data[i] - '0');
+	}
+
+	parser->cur_pos = i;
+	return FALSE;
+}
+
+static bool imap_parser_read_literal_data(struct imap_parser *parser,
+					  const unsigned char *data,
+					  size_t data_size)
+{
+	if (parser->literal_skip_crlf) {
+		/* skip \r\n or \n, anything else gives an error */
+		if (data_size == 0)
+			return FALSE;
+
+		if (*data == '\r') {
+			parser->line_size++;
+			data++; data_size--;
+			i_stream_skip(parser->input, 1);
+
+			if (data_size == 0)
+				return FALSE;
+		}
+
+		if (*data != '\n') {
+			parser->error = IMAP_PARSE_ERROR_BAD_SYNTAX;
+			parser->error_msg = "Missing LF after literal size";
+			return FALSE;
+		}
+
+		parser->line_size++;
+		data++; data_size--;
+		i_stream_skip(parser->input, 1);
+
+		parser->literal_skip_crlf = FALSE;
+
+		i_assert(parser->cur_pos == 0);
+	}
+
+	if ((parser->flags & IMAP_PARSE_FLAG_LITERAL_SIZE) == 0 ||
+	    parser->cur_type == ARG_PARSE_LITERAL_DATA_FORCED) {
+		/* now we just wait until we've read enough data */
+		if (data_size < parser->literal_size)
+			return FALSE;
+		else {
+			imap_parser_save_arg(parser, data,
+					     (size_t)parser->literal_size);
+			parser->cur_pos = (size_t)parser->literal_size;
+			return TRUE;
+		}
+	} else {
+		/* we want to save only literal size, not the literal itself. */
+		parser->literal_size_return = TRUE;
+		imap_parser_save_arg(parser, uchar_empty_ptr, 0);
+		return FALSE;
+	}
+}
+
+static bool imap_parser_is_next_resp_text(struct imap_parser *parser)
+{
+	const struct imap_arg *arg;
+
+	if (parser->cur_list != &parser->root_list ||
+	    array_count(parser->cur_list) != 1)
+		return FALSE;
+
+	arg = array_front(&parser->root_list);
+	if (arg->type != IMAP_ARG_ATOM)
+		return FALSE;
+
+	return strcasecmp(arg->_data.str, "OK") == 0 ||
+		strcasecmp(arg->_data.str, "NO") == 0 ||
+		strcasecmp(arg->_data.str, "BAD") == 0 ||
+		strcasecmp(arg->_data.str, "BYE") == 0;
+}
+
+static bool imap_parser_is_next_text(struct imap_parser *parser)
+{
+	const struct imap_arg *arg;
+	size_t len;
+
+	if (parser->cur_list != &parser->root_list)
+		return FALSE;
+
+	arg = array_back(&parser->root_list);
+	if (arg->type != IMAP_ARG_ATOM)
+		return FALSE;
+
+	len = strlen(arg->_data.str);
+	return len > 0 && arg->_data.str[len-1] == ']';
+}
+
+static bool imap_parser_read_text(struct imap_parser *parser,
+				  const unsigned char *data, size_t data_size)
+{
+	size_t i;
+
+	/* read until end of line */
+	for (i = parser->cur_pos; i < data_size; i++) {
+		if (is_linebreak(data[i])) {
+			imap_parser_save_arg(parser, data, i);
+			break;
+		}
+	}
+	parser->cur_pos = i;
+	return parser->cur_type == ARG_PARSE_NONE;
+}
+
+/* Returns TRUE if argument was fully processed. Also returns TRUE if
+   an argument inside a list was processed. */
+static bool imap_parser_read_arg(struct imap_parser *parser)
+{
+	const unsigned char *data;
+	size_t data_size;
+
+	data = i_stream_get_data(parser->input, &data_size);
+	if (data_size == 0)
+		return FALSE;
+
+	while (parser->cur_type == ARG_PARSE_NONE) {
+		/* we haven't started parsing yet */
+		if (!imap_parser_skip_to_next(parser, &data, &data_size))
+			return FALSE;
+		i_assert(parser->cur_pos == 0);
+
+		if (parser->cur_resp_text &&
+		    imap_parser_is_next_text(parser)) {
+			/* we just parsed [resp-text-code] */
+			parser->cur_type = ARG_PARSE_TEXT;
+			break;
+		}
+
+		switch (data[0]) {
+		case '\r':
+			if (data_size == 1) {
+				/* wait for LF */
+				return FALSE;
+			}
+			if (data[1] != '\n') {
+				parser->error = IMAP_PARSE_ERROR_BAD_SYNTAX;
+				parser->error_msg = "CR sent without LF";
+				return FALSE;
+			}
+			/* fall through */
+		case '\n':
+			/* unexpected end of line */
+			if ((parser->flags & IMAP_PARSE_FLAG_INSIDE_LIST) != 0) {
+				parser->error = IMAP_PARSE_ERROR_BAD_SYNTAX;
+				parser->error_msg = "Missing ')'";
+				return FALSE;
+			}
+			parser->eol = TRUE;
+			return FALSE;
+		case '"':
+			parser->cur_type = ARG_PARSE_STRING;
+			parser->str_first_escape = -1;
+			break;
+		case '~':
+			/* This could be either literal8 or atom */
+			if (data_size == 1) {
+				/* wait for the next char */
+				return FALSE;
+			}
+			if (data[1] != '{') {
+				parser->cur_type = ARG_PARSE_ATOM;
+				break;
+			}
+			if ((parser->flags & IMAP_PARSE_FLAG_LITERAL8) == 0) {
+				parser->error = IMAP_PARSE_ERROR_BAD_SYNTAX;
+				parser->error_msg = "literal8 not allowed here";
+				return FALSE;
+			}
+			parser->cur_type = ARG_PARSE_LITERAL8;
+			parser->literal_size = 0;
+			parser->literal_nonsync = FALSE;
+			parser->literal8 = TRUE;
+			break;
+		case '{':
+			parser->cur_type = ARG_PARSE_LITERAL;
+			parser->literal_size = 0;
+			parser->literal_nonsync = FALSE;
+			parser->literal8 = FALSE;
+			break;
+		case '(':
+			imap_parser_open_list(parser);
+			if ((parser->flags & IMAP_PARSE_FLAG_STOP_AT_LIST) != 0) {
+				i_stream_skip(parser->input, 1);
+				return FALSE;
+			}
+			break;
+		case ')':
+			if (!imap_parser_close_list(parser))
+				return FALSE;
+
+			if (parser->list_arg == NULL) {
+				/* end of argument */
+				parser->cur_pos++;
+				return TRUE;
+			}
+			break;
+		default:
+			if (!is_valid_atom_char(parser, data[0]))
+				return FALSE;
+			parser->cur_type = ARG_PARSE_ATOM;
+			break;
+		}
+
+		parser->cur_pos++;
+	}
+
+	i_assert(data_size > 0);
+
+	switch (parser->cur_type) {
+	case ARG_PARSE_ATOM:
+		if (!imap_parser_read_atom(parser, data, data_size))
+			return FALSE;
+		if ((parser->flags & IMAP_PARSE_FLAG_SERVER_TEXT) == 0)
+			break;
+
+		if (imap_parser_is_next_resp_text(parser)) {
+			/* we just parsed OK/NO/BAD/BYE. after parsing the
+			   [resp-text-code] the rest of the message can contain
+			   pretty much any random text, which we can't parse
+			   as if it was valid IMAP input */
+			parser->cur_resp_text = TRUE;
+		}
+		break;
+	case ARG_PARSE_STRING:
+		if (!imap_parser_read_string(parser, data, data_size))
+			return FALSE;
+		break;
+	case ARG_PARSE_LITERAL8:
+		if (parser->cur_pos == data_size)
+			return FALSE;
+		if (data[parser->cur_pos] != '{') {
+			parser->error = IMAP_PARSE_ERROR_BAD_SYNTAX;
+			parser->error_msg = "Expected '{'";
+			return FALSE;
+		}
+		parser->cur_type = ARG_PARSE_LITERAL;
+		parser->cur_pos++;
+		/* fall through */
+	case ARG_PARSE_LITERAL:
+		if (!imap_parser_read_literal(parser, data, data_size))
+			return FALSE;
+
+		/* pass through to parsing data. since input->skip was
+		   modified, we need to get the data start position again. */
+		data = i_stream_get_data(parser->input, &data_size);
+
+		/* fall through */
+	case ARG_PARSE_LITERAL_DATA:
+	case ARG_PARSE_LITERAL_DATA_FORCED:
+		if (!imap_parser_read_literal_data(parser, data, data_size))
+			return FALSE;
+		break;
+	case ARG_PARSE_TEXT:
+		if (!imap_parser_read_text(parser, data, data_size))
+			return FALSE;
+		break;
+	default:
+                i_unreached();
+	}
+
+	i_assert(parser->cur_type == ARG_PARSE_NONE);
+	return TRUE;
+}
+
+static void list_add_ghost_eol(struct imap_arg *list_arg)
+{
+	struct imap_arg *arg;
+
+	i_assert(list_arg->type == IMAP_ARG_LIST);
+
+	arg = array_append_space(&list_arg->_data.list);
+	arg->type = IMAP_ARG_EOL;
+	array_pop_back(&list_arg->_data.list);
+
+	if (list_arg->parent != NULL)
+		list_add_ghost_eol(list_arg->parent);
+}
+
+/* ARG_PARSE_NONE checks that last argument isn't only partially parsed. */
+#define IS_UNFINISHED(parser) \
+        ((parser)->cur_type != ARG_PARSE_NONE || \
+	 ((parser)->cur_list != &parser->root_list && \
+	 ((parser)->flags & IMAP_PARSE_FLAG_STOP_AT_LIST) == 0))
+
+static int finish_line(struct imap_parser *parser, unsigned int count,
+		       const struct imap_arg **args_r)
+{
+	struct imap_arg *arg;
+	int ret = array_count(&parser->root_list);
+
+	parser->line_size += parser->cur_pos;
+	i_stream_skip(parser->input, parser->cur_pos);
+	parser->cur_pos = 0;
+	parser->cur_resp_text = FALSE;
+
+	if (parser->list_arg == NULL) {
+		/* no open list */
+	} else if (!parser->literal_size_return &&
+		   (parser->flags & IMAP_PARSE_FLAG_STOP_AT_LIST) == 0) {
+		parser->error = IMAP_PARSE_ERROR_BAD_SYNTAX;
+		parser->error_msg = "Missing ')'";
+		*args_r = NULL;
+		return -1;
+	} else {
+		list_add_ghost_eol(parser->list_arg);
+	}
+
+	arg = array_append_space(&parser->root_list);
+	arg->type = IMAP_ARG_EOL;
+	parser->args_added_extra_eol = TRUE;
+
+	*args_r = array_get(&parser->root_list, &count);
+	return ret;
+}
+
+static void imap_parser_delete_extra_eol(struct imap_parser *parser)
+{
+	array_pop_back(&parser->root_list);
+	parser->args_added_extra_eol = FALSE;
+}
+
+int imap_parser_read_args(struct imap_parser *parser, unsigned int count,
+			  enum imap_parser_flags flags,
+			  const struct imap_arg **args_r)
+{
+	parser->flags = flags;
+
+	if (parser->args_added_extra_eol) {
+		/* delete EOL */
+		imap_parser_delete_extra_eol(parser);
+		parser->literal_size_return = FALSE;
+	}
+
+	while (!parser->eol && (count == 0 || IS_UNFINISHED(parser) ||
+				array_count(&parser->root_list) < count)) {
+		if (!imap_parser_read_arg(parser))
+			break;
+
+		if (parser->line_size > parser->max_line_size) {
+			parser->error = IMAP_PARSE_ERROR_LINE_TOO_LONG;
+			parser->error_msg = "IMAP command line too large";
+			break;
+		}
+	}
+
+	if (parser->error != IMAP_PARSE_ERROR_NONE) {
+		/* error, abort */
+		parser->line_size += parser->cur_pos;
+		i_stream_skip(parser->input, parser->cur_pos);
+		parser->cur_pos = 0;
+		*args_r = NULL;
+		return -1;
+	} else if ((!IS_UNFINISHED(parser) && count > 0 &&
+		    array_count(&parser->root_list) >= count) ||
+		   parser->eol || parser->literal_size_return) {
+		/* all arguments read / end of line. */
+                return finish_line(parser, count, args_r);
+	} else {
+		/* need more data */
+		*args_r = NULL;
+		return -2;
+	}
+}
+
+static struct imap_arg *
+imap_parser_get_last_literal_size(struct imap_parser *parser,
+				  ARRAY_TYPE(imap_arg_list) **list_r)
+{
+	ARRAY_TYPE(imap_arg_list) *list;
+	struct imap_arg *args;
+	unsigned int count;
+
+	list = &parser->root_list;
+	args = array_get_modifiable(&parser->root_list, &count);
+	i_assert(count > 1 && args[count-1].type == IMAP_ARG_EOL);
+	count--;
+
+	while (args[count-1].type != IMAP_ARG_LITERAL_SIZE &&
+	       args[count-1].type != IMAP_ARG_LITERAL_SIZE_NONSYNC) {
+		if (args[count-1].type != IMAP_ARG_LIST)
+			return NULL;
+
+		/* maybe the list ends with literal size */
+		list = &args[count-1]._data.list;
+		args = array_get_modifiable(list, &count);
+		if (count == 0)
+			return NULL;
+	}
+
+	*list_r = list;
+	return &args[count-1];
+}
+
+bool imap_parser_get_literal_size(struct imap_parser *parser, uoff_t *size_r)
+{
+	ARRAY_TYPE(imap_arg_list) *list;
+	struct imap_arg *last_arg;
+
+	last_arg = imap_parser_get_last_literal_size(parser, &list);
+	if (last_arg == NULL)
+		return FALSE;
+
+	return imap_arg_get_literal_size(last_arg, size_r);
+}
+
+void imap_parser_read_last_literal(struct imap_parser *parser)
+{
+	ARRAY_TYPE(imap_arg_list) *list;
+	struct imap_arg *last_arg;
+
+	i_assert(parser->literal_size_return);
+	i_assert(parser->args_added_extra_eol);
+
+	last_arg = imap_parser_get_last_literal_size(parser, &list);
+	i_assert(last_arg != NULL);
+
+	parser->cur_type = ARG_PARSE_LITERAL_DATA_FORCED;
+	i_assert(parser->literal_size == last_arg->_data.literal_size);
+
+	/* delete EOL */
+	imap_parser_delete_extra_eol(parser);
+
+	/* delete literal size */
+	array_pop_back(list);
+	parser->literal_size_return = FALSE;
+}
+
+int imap_parser_finish_line(struct imap_parser *parser, unsigned int count,
+			    enum imap_parser_flags flags,
+			    const struct imap_arg **args_r)
+{
+	const unsigned char *data;
+	size_t data_size;
+	int ret;
+
+	ret = imap_parser_read_args(parser, count, flags, args_r);
+	if (ret == -1)
+		return -1;
+	if (ret == -2) {
+		/* we should have noticed end of everything except atom */
+		if (parser->cur_type == ARG_PARSE_ATOM) {
+			data = i_stream_get_data(parser->input, &data_size);
+			imap_parser_save_arg(parser, data, data_size);
+		}
+	}
+	return finish_line(parser, count, args_r);
+}
+
+const char *imap_parser_read_word(struct imap_parser *parser)
+{
+	const unsigned char *data;
+	size_t i, data_size;
+
+	data = i_stream_get_data(parser->input, &data_size);
+
+	for (i = 0; i < data_size; i++) {
+		if (data[i] == ' ' || data[i] == '\r' || data[i] == '\n')
+			break;
+	}
+
+	if (i < data_size) {
+		data_size = i + (data[i] == ' ' ? 1 : 0);
+		parser->line_size += data_size;
+		i_stream_skip(parser->input, data_size);
+		return p_strndup(parser->pool, data, i);
+	} else {
+		return NULL;
+	}
+}
+
+static int
+imap_parser_read_next_atom(struct imap_parser *parser, bool parsing_tag,
+			   const char **atom_r)
+{
+	const unsigned char *data;
+	size_t i, data_size;
+
+	data = i_stream_get_data(parser->input, &data_size);
+
+	/*
+	   tag            = 1*<any ASTRING-CHAR except "+">
+	   ASTRING-CHAR   = ATOM-CHAR / resp-specials
+	   ATOM-CHAR      = <any CHAR except atom-specials>
+
+	   x-command      = "X" atom <experimental command arguments>
+	   atom           = 1*ATOM-CHAR
+	*/
+	for (i = 0; i < data_size; i++) {
+		/* explicitly check for atom-specials, because
+		   IS_ATOM_PARSER_INPUT() allows some atom-specials */
+		switch (data[i]) {
+		case ' ':
+		case '\r':
+		case '\n':
+			data_size = i + (data[i] == ' ' ? 1 : 0);
+			parser->line_size += data_size;
+			i_stream_skip(parser->input, data_size);
+			*atom_r = p_strndup(parser->pool, data, i);
+			/* don't allow empty string */
+			return i == 0 ? -1 : 1;
+		/* atom-specials: */
+		case '(':
+		case ')':
+		case '{':
+		/* list-wildcards: */
+		case '%':
+		case '*':
+		/* quoted-specials: */
+		case '"':
+		case '\\':
+		/* resp-specials: */
+		case ']':
+			return -1;
+		case '+':
+			if (parsing_tag)
+				return -1;
+			break;
+		default:
+			if ((unsigned char)data[i] < ' ' ||
+			    (unsigned char)data[i] >= 0x80)
+				return -1;
+		}
+	}
+	return 0;
+}
+
+int imap_parser_read_tag(struct imap_parser *parser, const char **tag_r)
+{
+	return imap_parser_read_next_atom(parser, TRUE, tag_r);
+}
+
+int imap_parser_read_command_name(struct imap_parser *parser,
+				  const char **name_r)
+{
+	return imap_parser_read_next_atom(parser, FALSE, name_r);
+}
+
+int imap_parser_client_read_tag(struct imap_parser *parser,
+				const char **tag_r)
+{
+	return imap_parser_read_next_atom(parser, FALSE, tag_r);
+}
diff --git a/src/lib-imap/imap-parser.h b/src/lib-imap/imap-parser.h
new file mode 100644
index 0000000..cd3748c
--- /dev/null
+++ b/src/lib-imap/imap-parser.h
@@ -0,0 +1,117 @@
+#ifndef IMAP_PARSER_H
+#define IMAP_PARSER_H
+
+#include "imap-arg.h"
+
+enum imap_parser_flags {
+	/* Set this flag if you wish to read only size of literal argument
+	   and not convert literal into string. Useful when you need to deal
+	   with large literal sizes. The literal must be the last read
+	   parameter. */
+	IMAP_PARSE_FLAG_LITERAL_SIZE	= 0x01,
+	/* Don't remove '\' chars from string arguments */
+	IMAP_PARSE_FLAG_NO_UNESCAPE	= 0x02,
+	/* Return literals as IMAP_ARG_LITERAL instead of IMAP_ARG_STRING */
+	IMAP_PARSE_FLAG_LITERAL_TYPE	= 0x04,
+	/* Don't check if atom contains invalid characters */
+	IMAP_PARSE_FLAG_ATOM_ALLCHARS	= 0x08,
+	/* Allow strings to contain CRLFs */
+	IMAP_PARSE_FLAG_MULTILINE_STR	= 0x10,
+	/* Parse in list context; ')' parses as EOL */
+	IMAP_PARSE_FLAG_INSIDE_LIST	= 0x20,
+	/* Parse literal8 and set it as flag to imap_arg. */
+	IMAP_PARSE_FLAG_LITERAL8	= 0x40,
+	/* We're parsing IMAP server replies. Parse the "text" after
+	   OK/NO/BAD/BYE replies as a single atom. We assume that the initial
+	   "*" or tag was already skipped over. */
+	IMAP_PARSE_FLAG_SERVER_TEXT	= 0x80,
+	/* Parse until '(' and return it as an empty list */
+	IMAP_PARSE_FLAG_STOP_AT_LIST	= 0x100
+};
+
+enum imap_parser_error {
+	/* not fatal */
+	IMAP_PARSE_ERROR_NONE = 0,
+	IMAP_PARSE_ERROR_BAD_SYNTAX,
+	IMAP_PARSE_ERROR_LINE_TOO_LONG,
+	/* fatal */
+	IMAP_PARSE_ERROR_LITERAL_TOO_BIG
+};
+
+struct imap_parser;
+
+/* Create new IMAP argument parser. output is used for sending command
+   continuation requests for literals.
+
+   max_line_size can be used to approximately limit the maximum amount of
+   memory that gets allocated when parsing a line. Input buffer size limits
+   the maximum size of each parsed token.
+
+   Usually the largest lines are large only because they have a one huge
+   message set token, so you'll probably want to keep input buffer size the
+   same as max_line_size. That means the maximum memory usage is around
+   2 * max_line_size. */
+struct imap_parser *
+imap_parser_create(struct istream *input, struct ostream *output,
+		   size_t max_line_size) ATTR_NULL(2);
+void imap_parser_ref(struct imap_parser *parser);
+void imap_parser_unref(struct imap_parser **parser);
+
+/* Enable LITERAL- parser semantics: non-synchronizing literals must not
+   exceed 4096 bytes */
+void imap_parser_enable_literal_minus(struct imap_parser *parser);
+
+/* Reset the parser to initial state. */
+void imap_parser_reset(struct imap_parser *parser);
+
+/* Change parser's input and output streams */
+void imap_parser_set_streams(struct imap_parser *parser, struct istream *input,
+			     struct ostream *output) ATTR_NULL(3);
+
+/* Return the last error in parser. fatal is set to TRUE if there's no way to
+   continue parsing, currently only if too large non-sync literal size was
+   given. */
+const char *imap_parser_get_error(struct imap_parser *parser,
+	enum imap_parser_error *error_r) ATTR_NULL(2);
+
+/* Read a number of arguments. This function doesn't call i_stream_read(), you
+   need to do that. Returns number of arguments read (may be less than count
+   in case of EOL), -2 if more data is needed or -1 if error occurred.
+
+   count-sized array of arguments are stored into args when return value is
+   0 or larger. If all arguments weren't read, they're set to NIL. count
+   can be set to 0 to read all arguments in the line. Last element in
+   args is always of type IMAP_ARG_EOL. */
+int imap_parser_read_args(struct imap_parser *parser, unsigned int count,
+			  enum imap_parser_flags flags,
+			  const struct imap_arg **args_r);
+/* If parsing ended with literal size, return it. */
+bool imap_parser_get_literal_size(struct imap_parser *parser, uoff_t *size_r);
+/* IMAP_PARSE_FLAG_LITERAL_SIZE is set and last read argument was a literal.
+   Calling this function causes the literal size to be replaced with the actual
+   literal data when continuing argument parsing. */
+void imap_parser_read_last_literal(struct imap_parser *parser);
+
+/* just like imap_parser_read_args(), but assume \n at end of data in
+   input stream. */
+int imap_parser_finish_line(struct imap_parser *parser, unsigned int count,
+			    enum imap_parser_flags flags,
+			    const struct imap_arg **args_r);
+
+/* Read one word - used for reading tag and command name.
+   Returns NULL if more data is needed. */
+const char *imap_parser_read_word(struct imap_parser *parser);
+/* Read command tag. Returns 1 if tag was returned, 0 if more data is needed,
+   -1 if input isn't a valid tag. */
+int imap_parser_read_tag(struct imap_parser *parser, const char **tag_r);
+/* Read command name. Returns 1 if command name was returned, 0 if more data is
+   needed, -1 if input isn't a valid command name string. */
+int imap_parser_read_command_name(struct imap_parser *parser,
+				  const char **name_r);
+/* For IMAP clients: Read the command tag, which could also be "+" or "*".
+   Returns 1 if tag was returned, 0 if more data is needed, -1 if input isn't
+   valid. */
+int imap_parser_client_read_tag(struct imap_parser *parser,
+				const char **tag_r);
+
+#endif
diff --git a/src/lib-imap/imap-quote.c b/src/lib-imap/imap-quote.c
new file mode 100644
index 0000000..622e21c
--- /dev/null
+++ b/src/lib-imap/imap-quote.c
@@ -0,0 +1,239 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "str.h"
+#include "imap-arg.h"
+#include "imap-quote.h"
+
+/* If we have quoted-specials (<">, <\>) in a string, the minimum quoted-string
+   overhead is 3 bytes ("\") while the minimum literal overhead is 5 bytes
+   ("{n}\r\n"). But the literal overhead also depends on the string size. If
+   the string length is less than 10, literal catches up to quoted-string after
+   3 quoted-specials. If the string length is 10..99, it catches up after 4
+   quoted-specials, and so on. We'll assume that the string lengths are usually
+   in double digits, so we'll switch to literals after seeing 4
+   quoted-specials. */
+#define QUOTED_MAX_ESCAPE_CHARS 4
+
+void imap_append_string(string_t *dest, const char *src)
+{
+	i_assert(src != NULL);
+
+	imap_append_nstring(dest, src);
+}
+
+void imap_append_astring(string_t *dest, const char *src)
+{
+	unsigned int i;
+
+	i_assert(src != NULL);
+
+	for (i = 0; src[i] != '\0'; i++) {
+		if (!IS_ASTRING_CHAR(src[i])) {
+			imap_append_string(dest, src);
+			return;
+		}
+	}
+	/* don't mix up NIL and "NIL"! */
+	if (i == 0 || strcasecmp(src, "NIL") == 0)
+		imap_append_string(dest, src);
+	else
+		str_append(dest, src);
+}
+
+static void
+imap_append_literal(string_t *dest, const char *src, unsigned int pos)
+{
+	size_t full_len = pos + strlen(src+pos);
+
+	str_printfa(dest, "{%zu}\r\n", full_len);
+	buffer_append(dest, src, full_len);
+}
+
+void imap_append_nstring(string_t *dest, const char *src)
+{
+	unsigned int escape_count = 0;
+	size_t i;
+
+	if (src == NULL) {
+		str_append(dest, "NIL");
+		return;
+	}
+
+	/* first check if we can (or want to) write this as quoted or
+	   as literal.
+
+	   quoted-specials = DQUOTE / "\"
+	   QUOTED-CHAR     = <any TEXT-CHAR except quoted-specials> /
+	                     "\" quoted-specials
+	   TEXT-CHAR       = <any CHAR except CR and LF>
+	*/
+	for (i = 0; src[i] != '\0'; i++) {
+		switch (src[i]) {
+		case '"':
+		case '\\':
+			if (escape_count++ < QUOTED_MAX_ESCAPE_CHARS)
+				break;
+			/* fall through */
+		case 13:
+		case 10:
+			imap_append_literal(dest, src, i);
+			return;
+		default:
+			if ((unsigned char)src[i] >= 0x80) {
+				imap_append_literal(dest, src, i);
+				return;
+			}
+			break;
+		}
+	}
+	imap_append_quoted(dest, src);
+}
+
+static void remove_newlines_and_append(string_t *dest, const char *src)
+{
+	size_t src_len;
+	string_t *src_nolf;
+	src_len = strlen(src);
+	src_nolf = t_str_new(src_len + 1);
+	for (size_t i = 0; i < src_len; ++i) {
+		if (src[i] != '\r' && src[i] != '\n') {
+			str_append_c(src_nolf, src[i]);
+		} else if (src[i+1] != ' ' &&
+			   src[i+1] != '\t' &&
+			   src[i+1] != '\r' &&
+			   src[i+1] != '\n' &&
+			   src[i+1] != '\0') {
+			/* ensure whitespace between lines if new line doesn't start with whitespace */
+			str_append_c(src_nolf, ' ');
+		}
+	}
+	imap_append_nstring(dest, str_c(src_nolf));
+}
+
+void imap_append_nstring_nolf(string_t *dest, const char *src)
+{
+	if (src == NULL || strpbrk(src, "\r\n") == NULL)
+		imap_append_nstring(dest, src);
+	else if (buffer_get_pool(dest)->datastack_pool)
+		remove_newlines_and_append(dest, src);
+	else T_BEGIN {
+		remove_newlines_and_append(dest, src);
+	} T_END;
+}
+
+void imap_append_quoted(string_t *dest, const char *src)
+{
+	str_append_c(dest, '"');
+	for (; *src != '\0'; src++) {
+		switch (*src) {
+		case 13:
+		case 10:
+			/* not allowed */
+			break;
+		case '"':
+		case '\\':
+			str_append_c(dest, '\\');
+			str_append_c(dest, *src);
+			break;
+		default:
+			if ((unsigned char)*src >= 0x80) {
+				/* 8bit input not allowed in dquotes */
+				break;
+			}
+
+			str_append_c(dest, *src);
+			break;
+		}
+	}
+	str_append_c(dest, '"');
+}
+
+void imap_append_string_for_humans(string_t *dest,
+				   const unsigned char *src, size_t size)
+{
+	size_t i, pos, remove_count = 0;
+	bool whitespace_prefix = TRUE, last_lwsp = TRUE, modify = FALSE;
+
+	/* first check if there is anything to change */
+	for (i = 0; i < size; i++) {
+		switch (src[i]) {
+		case 0:
+			/* convert NUL to #0x80 */
+			last_lwsp = FALSE;
+			modify = TRUE;
+			break;
+		case 13:
+		case 10:
+		case '\t':
+			modify = TRUE;
+			/* fall through */
+		case ' ':
+			if (last_lwsp) {
+				modify = TRUE;
+				remove_count++;
+			}
+			last_lwsp = TRUE;
+			break;
+		case '"':
+		case '\\':
+			modify = TRUE;
+			last_lwsp = FALSE;
+			break;
+		default:
+			if ((src[i] & 0x80) != 0)
+				modify = TRUE;
+			last_lwsp = FALSE;
+			break;
+		}
+		if (!last_lwsp)
+			whitespace_prefix = FALSE;
+	}
+	if (last_lwsp && i > 0 && !whitespace_prefix) {
+		modify = TRUE;
+		remove_count++;
+	}
+	if (!modify) {
+		/* fast path: we can simply write it as quoted string
+		   without any escaping */
+		str_append_c(dest, '"');
+		str_append_data(dest, src, size);
+		str_append_c(dest, '"');
+		return;
+	}
+	if (size == remove_count) {
+		/* contained only whitespace */
+		str_append(dest, "\"\"");
+		return;
+	}
+
+	str_printfa(dest, "{%zu}\r\n", size - remove_count);
+	pos = str_len(dest);
+
+	last_lwsp = TRUE; whitespace_prefix = TRUE;
+	for (i = 0; i < size; i++) {
+		switch (src[i]) {
+		case 0:
+			str_append_c(dest, 128);
+			last_lwsp = FALSE;
+			break;
+		case 13:
+		case 10:
+		case '\t':
+		case ' ':
+			if (!last_lwsp)
+				str_append_c(dest, ' ');
+			last_lwsp = TRUE;
+			break;
+		default:
+			last_lwsp = FALSE;
+			str_append_c(dest, src[i]);
+			break;
+		}
+		if (!last_lwsp)
+			whitespace_prefix = FALSE;
+	}
+	if (last_lwsp && i > 0 && !whitespace_prefix)
+		str_truncate(dest, str_len(dest)-1);
+	i_assert(str_len(dest) - pos == size - remove_count);
+}
diff --git a/src/lib-imap/imap-quote.h b/src/lib-imap/imap-quote.h
new file mode 100644
index 0000000..a397ec3
--- /dev/null
+++ b/src/lib-imap/imap-quote.h
@@ -0,0 +1,21 @@
+#ifndef IMAP_QUOTE_H
+#define IMAP_QUOTE_H
+
+/* Append "quoted" or literal. */
+void imap_append_string(string_t *dest, const char *src);
+/* Append atom, "quoted" or literal. */
+void imap_append_astring(string_t *dest, const char *src);
+/* Append NIL, "quoted" or literal. */
+void imap_append_nstring(string_t *dest, const char *src);
+/* Append NIL, "quoted" or literal, CRs and LFs skipped. */
+void imap_append_nstring_nolf(string_t *dest, const char *src);
+/* Append "quoted". If src has 8bit chars, skip over them. */
+void imap_append_quoted(string_t *dest, const char *src);
+
+/* Otherwise the same as imap_append_string(), but cleanup the input data
+   so that it's more readable by humans. This includes converting TABs to
+   spaces, multiple spaces into a single space and NULs to #0x80. */
+void imap_append_string_for_humans(string_t *dest,
+				   const unsigned char *src, size_t size);
+
+#endif
diff --git a/src/lib-imap/imap-resp-code.h b/src/lib-imap/imap-resp-code.h
new file mode 100644
index 0000000..a7a4de8
--- /dev/null
+++ b/src/lib-imap/imap-resp-code.h
@@ -0,0 +1,28 @@
+#ifndef IMAP_RESP_CODE_H
+#define IMAP_RESP_CODE_H
+
+/* IMAP response codes (RFC 5530) */
+#define IMAP_RESP_CODE_UNAVAILABLE "UNAVAILABLE"
+#define IMAP_RESP_CODE_AUTHFAILED "AUTHENTICATIONFAILED"
+#define IMAP_RESP_CODE_AUTHZFAILED "AUTHORIZATIONFAILED"
+#define IMAP_RESP_CODE_EXPIRED "EXPIRED"
+#define IMAP_RESP_CODE_PRIVACYREQUIRED "PRIVACYREQUIRED"
+#define IMAP_RESP_CODE_CONTACTADMIN "CONTACTADMIN"
+#define IMAP_RESP_CODE_NOPERM "NOPERM"
+#define IMAP_RESP_CODE_INUSE "INUSE"
+#define IMAP_RESP_CODE_EXPUNGEISSUED "EXPUNGEISSUED"
+#define IMAP_RESP_CODE_CORRUPTION "CORRUPTION"
+#define IMAP_RESP_CODE_SERVERBUG "SERVERBUG"
+#define IMAP_RESP_CODE_CLIENTBUG "CLIENTBUG"
+#define IMAP_RESP_CODE_CANNOT "CANNOT"
+#define IMAP_RESP_CODE_LIMIT "LIMIT"
+#define IMAP_RESP_CODE_OVERQUOTA "OVERQUOTA"
+#define IMAP_RESP_CODE_ALREADYEXISTS "ALREADYEXISTS"
+#define IMAP_RESP_CODE_NONEXISTENT "NONEXISTENT"
+
+#define IMAP_RESP_CODE_UNKNOWN_CTE "UNKNOWN-CTE" /* BINARY */
+
+/* IMAP standard (RFC 3501) */
+#define IMAP_RESP_CODE_PARSE "PARSE"
+
+#endif
diff --git a/src/lib-imap/imap-seqset.c b/src/lib-imap/imap-seqset.c
new file mode 100644
index 0000000..5e7ea21
--- /dev/null
+++ b/src/lib-imap/imap-seqset.c
@@ -0,0 +1,105 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "imap-seqset.h"
+
+static uint32_t get_next_number(const char **str)
+{
+	uint32_t num;
+
+	num = 0;
+	while (**str != '\0') {
+		if (**str < '0' || **str > '9')
+			break;
+
+		num = num*10 + (**str - '0');
+		(*str)++;
+	}
+
+	if (num == (uint32_t)-1) {
+		/* FIXME: ugly hack, we're using this number to mean the
+		   last existing message. In reality UIDs should never get
+		   this high, so we can quite safely just drop this one down. */
+		num--;
+	}
+
+	return num;
+}
+
+static int
+get_next_seq_range(const char **str, uint32_t *seq1_r, uint32_t *seq2_r)
+{
+	uint32_t seq1, seq2;
+
+	if (**str == '*') {
+		/* last message */
+		seq1 = (uint32_t)-1;
+		*str += 1;
+	} else {
+		seq1 = get_next_number(str);
+		if (seq1 == 0)
+			return -1;
+	}
+
+	if (**str != ':')
+		seq2 = seq1;
+	else {
+		/* first:last range */
+		*str += 1;
+
+		if (**str == '*') {
+			seq2 = (uint32_t)-1;
+			*str += 1;
+		} else {
+			seq2 = get_next_number(str);
+			if (seq2 == 0)
+				return -1;
+		}
+	}
+
+	if (seq1 > seq2) {
+		/* swap, as specified by RFC-3501 */
+		*seq1_r = seq2;
+		*seq2_r = seq1;
+	} else {
+		*seq1_r = seq1;
+		*seq2_r = seq2;
+	}
+	return 0;
+}
+
+int imap_seq_set_parse(const char *str, ARRAY_TYPE(seq_range) *dest)
+{
+	uint32_t seq1, seq2;
+
+	while (*str != '\0') {
+		if (get_next_seq_range(&str, &seq1, &seq2) < 0)
+			return -1;
+		seq_range_array_add_range(dest, seq1, seq2);
+
+		if (*str == ',')
+			str++;
+		else if (*str != '\0')
+			return -1;
+	}
+	return 0;
+}
+
+int imap_seq_set_nostar_parse(const char *str, ARRAY_TYPE(seq_range) *dest)
+{
+	if (imap_seq_set_parse(str, dest) < 0)
+		return -1;
+
+	if (seq_range_exists(dest, (uint32_t)-1)) {
+		/* '*' used */
+		return -1;
+	}
+	return 0;
+}
+
+int imap_seq_range_parse(const char *str, uint32_t *seq1_r, uint32_t *seq2_r)
+{
+	if (get_next_seq_range(&str, seq1_r, seq2_r) < 0)
+		return -1;
+	return *str == '\0' ? 0 : -1;
+}
diff --git a/src/lib-imap/imap-seqset.h b/src/lib-imap/imap-seqset.h
new file mode 100644
index 0000000..a7e1ffd
--- /dev/null
+++ b/src/lib-imap/imap-seqset.h
@@ -0,0 +1,15 @@
+#ifndef IMAP_SEQSET_H
+#define IMAP_SEQSET_H
+
+#include "seq-range-array.h"
+
+/* Parse IMAP sequence-set and store the result in dest. '*' is stored as
+   (uint32_t)-1. Returns 0 if successful, -1 if input is invalid. */
+int imap_seq_set_parse(const char *str, ARRAY_TYPE(seq_range) *dest);
+/* Like imap_seq_set_parse(), but fail if '*' is used. */
+int imap_seq_set_nostar_parse(const char *str, ARRAY_TYPE(seq_range) *dest);
+
+/* Parse IMAP seq-number / seq-range. */
+int imap_seq_range_parse(const char *str, uint32_t *seq1_r, uint32_t *seq2_r);
+
+#endif
diff --git a/src/lib-imap/imap-url.c b/src/lib-imap/imap-url.c
new file mode 100644
index 0000000..6da6e21
--- /dev/null
+++ b/src/lib-imap/imap-url.c
@@ -0,0 +1,1009 @@
+/* Copyright (c) 2010-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "str.h"
+#include "strfuncs.h"
+#include "str-sanitize.h"
+#include "hex-binary.h"
+#include "net.h"
+#include "iso8601-date.h"
+#include "uri-util.h"
+
+#include "imap-url.h"
+
+#include <ctype.h>
+
+/*
+ * IMAP URL parsing
+ */
+
+/*
+IMAP URL Grammar overview
+
+RFC5092 Section 11:
+
+imapurl          = "imap://" iserver ipath-query
+                   ; Defines an absolute IMAP URL
+iserver          = [iuserinfo "@"] host [ ":" port ]
+                   ; This is the same as "authority" defined in [URI-GEN].
+iuserinfo        = enc-user [iauth] / [enc-user] iauth
+                   ; conforms to the generic syntax of "userinfo" as
+                   ; defined in [URI-GEN].
+enc-user         = 1*achar
+                   ; %-encoded version of [IMAP4] authorization identity or
+                   ; "userid".
+iauth            = ";AUTH=" ( "*" / enc-auth-type )
+enc-auth-type    = 1*achar
+                   ; %-encoded version of [IMAP4] "auth-type"
+ipath-query      = ["/" [ icommand ]]
+                   ; Corresponds to "path-abempty [ "?" query ]" in
+                   ; [URI-GEN]
+icommand         = imessagelist /
+                   imessagepart [iurlauth]
+imessagelist     = imailbox-ref [ "?" enc-search ]
+                   ; "enc-search" is [URI-GEN] "query".
+imessagepart     = imailbox-ref iuid [isection] [ipartial]
+imailbox-ref     = enc-mailbox [uidvalidity]
+uidvalidity      = ";UIDVALIDITY=" nz-number
+                   ; See [IMAP4] for "nz-number" definition
+iuid             = "/" iuid-only
+iuid-only        = ";UID=" nz-number
+                   ; See [IMAP4] for "nz-number" definition
+isection         = "/" isection-only
+isection-only    = ";SECTION=" enc-section
+ipartial         = "/" ipartial-only
+ipartial-only    = ";PARTIAL=" partial-range
+enc-search       = 1*bchar
+                   ; %-encoded version of [IMAPABNF]
+                   ; "search-program".  Note that IMAP4
+                   ; literals may not be used in
+                   ; a "search-program", i.e., only
+                   ; quoted or non-synchronizing
+                   ; literals (if the server supports
+                   ; LITERAL+ [LITERAL+]) are allowed.
+enc-mailbox      = 1*bchar
+                   ; %-encoded version of [IMAP4] "mailbox"
+enc-section      = 1*bchar
+                   ; %-encoded version of [IMAP4] "section-spec"
+partial-range    = number ["." nz-number]
+                   ; partial FETCH.  The first number is
+                   ; the offset of the first byte,
+                   ; the second number is the length of
+                   ; the fragment.
+bchar            = achar / ":" / "@" / "/"
+achar            = uchar / "&" / "="
+                   ;; Same as [URI-GEN] 'unreserved / sub-delims /
+                   ;; pct-encoded', but ";" is disallowed.
+uchar            = unreserved / sub-delims-sh / pct-encoded
+sub-delims-sh    = "!" / "$" / "'" / "(" / ")" /
+                   "*" / "+" / ","
+                   ;; Same as [URI-GEN] sub-delims,
+                   ;; but without ";", "&" and "=".
+
+The following rules are only used in the presence of the IMAP
+[URLAUTH] extension:
+
+authimapurl      = "imap://" iserver "/" imessagepart
+                   ; Same as "imapurl" when "[icommand]" is
+                   ; "imessagepart"
+authimapurlfull  = authimapurl iurlauth
+                   ; Same as "imapurl" when "[icommand]" is
+                   ; "imessagepart iurlauth"
+authimapurlrump  = authimapurl iurlauth-rump
+
+iurlauth         = iurlauth-rump iua-verifier
+enc-urlauth      = 32*HEXDIG
+iua-verifier     = ":" uauth-mechanism ":" enc-urlauth
+iurlauth-rump    = [expire] ";URLAUTH=" access
+access           = ("submit+" enc-user) / ("user+" enc-user) /
+                   "authuser" / "anonymous"
+expire           = ";EXPIRE=" date-time
+                   ; date-time is defined in [DATETIME]
+uauth-mechanism  = "INTERNAL" / 1*(ALPHA / DIGIT / "-" / ".")
+                   ; Case-insensitive.
+
+[URI-GEN] RFC3986 Appendix A:
+
+Implemented in src/lib/uri-util.c
+
+*/
+
+/*
+ * Imap URL parser
+ */
+
+struct imap_url_parser {
+	struct uri_parser parser;
+
+	enum imap_url_parse_flags flags;
+
+	struct imap_url *url;
+	const struct imap_url *base;
+
+	bool relative:1;
+};
+
+static int
+imap_url_parse_number(struct uri_parser *parser, const char *data,
+		      uint32_t *number_r)
+{
+	/* [IMAP4] RFC3501, Section 9
+	 *
+	 * number          = 1*DIGIT
+	 *                   ; Unsigned 32-bit integer
+	 *                   ; (0 <= n < 4,294,967,296)
+	 */
+
+	if (i_isdigit(*data)) {
+		if (str_to_uint32(data, number_r) == 0)
+			return 1;
+		parser->error = "IMAP number is too high";
+		return -1;
+	}
+
+	parser->error = t_strdup_printf(
+		"Value '%s' is not a valid IMAP number", data);
+	return -1;
+}
+
+static int
+imap_url_parse_offset(struct uri_parser *parser, const char *data,
+		      uoff_t *number_r)
+{
+	/* Syntax for big (uoff_t) numbers. Not strictly IMAP syntax, but this
+	   is handled similarly for Dovecot IMAP FETCH BODY partial <.>
+	   implementation. */
+	if (i_isdigit(*data)) {
+		if (str_to_uoff(data, number_r) == 0)
+			return 1;
+		parser->error = "IMAP number is too high";
+		return -1;
+	}
+
+	parser->error = t_strdup_printf(
+		"Value '%s' is not a valid IMAP number", data);
+	return -1;
+}
+
+static int imap_url_parse_iserver(struct imap_url_parser *url_parser)
+{
+	struct uri_parser *parser = &url_parser->parser;
+	struct uri_authority auth;
+	struct imap_url *url = url_parser->url;
+	const char *data;
+	int ret = 0;
+
+	/* imapurl          = "imap://" iserver {...}
+	 * inetwork-path    = "//" iserver {...}
+	 * iserver          = [iuserinfo "@"] host [":" port]
+	 *                    ; This is the same as "authority" defined
+	 *                    ; in [URI-GEN].
+	 * iuserinfo        = enc-user [iauth] / [enc-user] iauth
+	 *                    ; conforms to the generic syntax of "userinfo" as
+	 *                    ; defined in [URI-GEN].
+	 * enc-user         = 1*achar
+	 *                    ; %-encoded version of [IMAP4] authorization identity or
+	 *                    ; "userid".
+	 * iauth            = ";AUTH=" ( "*" / enc-auth-type )
+	 * enc-auth-type    = 1*achar
+	 *                    ; %-encoded version of [IMAP4] "auth-type"
+	 */
+
+	/* "//" iserver */
+	if ((ret = uri_parse_slashslash_host_authority
+		(parser, &auth)) <= 0)
+		return ret;
+	if (auth.host.name == NULL || *auth.host.name == '\0') {
+		/* This situation is not documented anywhere, but it is not
+		   currently useful either and potentially problematic if not
+		   handled explicitly everywhere. So, it is denied hier for now.
+		 */
+		parser->error = "IMAP URL does not allow empty host identifier";
+		return -1;
+	}
+	/* iuserinfo        = enc-user [iauth] / [enc-user] iauth */
+	if (auth.enc_userinfo != NULL) {
+		const char *p, *uend;
+
+		/* Scan for ";AUTH=" */
+		for (p = auth.enc_userinfo; *p != '\0'; p++) {
+			if (*p == ';')
+				break;
+			/* check for unallowed userinfo characters */
+			if (*p == ':') {
+				parser->error = t_strdup_printf(
+					"Stray ':' in userinfo `%s'", auth.enc_userinfo);
+				return -1;
+			}
+		}
+
+		uend = p;
+
+		if (*p == ';') {
+			if (strncasecmp(p, ";AUTH=", 6) != 0) {
+				parser->error = t_strdup_printf(
+					"Stray ';' in userinfo `%s'",
+					auth.enc_userinfo);
+				return -1;
+			}
+
+			for (p += 6; *p != '\0'; p++) {
+				if (*p == ';' || *p == ':') {
+					parser->error = t_strdup_printf(
+						"Stray '%c' in userinfo `%s'", *p, auth.enc_userinfo);
+					return -1;
+				}
+			}
+		}
+
+		/* enc-user */
+		if (url != NULL && uend > auth.enc_userinfo) {
+			if (!uri_data_decode(parser, auth.enc_userinfo, uend, &data))
+				return -1;
+			url->userid = p_strdup(parser->pool, data);
+		}
+
+		/* ( "*" / enc-auth-type ) */
+		if (*uend == ';') {
+			p = uend + 6;
+			if (*p == '\0') {
+				parser->error = "Empty auth-type value after ';AUTH='";
+				return -1;
+			}
+			if (url != NULL) {
+				if (!uri_data_decode(parser, p, NULL, &data))
+					return -1;
+				url->auth_type = p_strdup(parser->pool, data);
+			}
+		}
+	}
+
+	if (url != NULL) {
+		url->host = auth.host;
+		url->port = auth.port;
+	}
+	return 1;
+}
+
+static int
+imap_url_parse_urlauth(struct imap_url_parser *url_parser, const char *urlext)
+{
+	struct uri_parser *parser = &url_parser->parser;
+	struct imap_url *url = url_parser->url;
+	const char *p, *q, *data;
+	buffer_t *uauth_token;
+	time_t expire = (time_t)-1;
+	int tz;
+
+	/* iurlauth         = iurlauth-rump iua-verifier
+	 * enc-urlauth      = 32*HEXDIG
+	 * iua-verifier     = ":" uauth-mechanism ":" enc-urlauth
+	 * iurlauth-rump    = [expire] ";URLAUTH=" access
+	 * access           = ("submit+" enc-user) / ("user+" enc-user) /
+	 *                    "authuser" / "anonymous"
+	 * expire           = ";EXPIRE=" date-time
+	 *                    ; date-time is defined in [DATETIME]
+	 * uauth-mechanism  = "INTERNAL" / 1*(ALPHA / DIGIT / "-" / ".")
+	 *                    ; Case-insensitive.
+	 */
+
+	/* ";EXPIRE=" date-time */
+	if (strncasecmp(urlext, ";EXPIRE=", 8) == 0) {
+		if ((url_parser->flags & IMAP_URL_PARSE_ALLOW_URLAUTH) == 0) {
+			parser->error = "`;EXPIRE=' is not allowed in this context";
+			return -1;
+		}
+
+		if ((p = strchr(urlext+8, ';')) != NULL) {
+			if (!iso8601_date_parse((const unsigned char *)urlext+8,
+						p-urlext-8, &expire, &tz)) {
+				parser->error = "invalid date-time for `;EXPIRE='";
+				return -1;
+			}
+			urlext = p;
+		}
+	}
+
+	/* ";URLAUTH=" access */
+	if (strncasecmp(urlext, ";URLAUTH=", 9) != 0) {
+		if (expire != (time_t)-1) {
+			parser->error = "`;EXPIRE=' without `;URLAUTH='";
+			return -1;
+		}
+		return 0;
+	}
+	urlext += 9;
+
+	if (url != NULL)
+		url->uauth_expire = expire;
+
+	if ((url_parser->flags & IMAP_URL_PARSE_ALLOW_URLAUTH) == 0) {
+		parser->error = "`;URLAUTH=' is not allowed in this context";
+		return -1;
+	}
+
+	if (url_parser->relative) {
+		parser->error = "IMAP URLAUTH requires absolute URL";
+		return -1;
+	}
+
+	if ((p = strchr(urlext, ':')) == NULL) {
+		size_t len = strlen(urlext);
+		if (len == 0) {
+			parser->error = "Missing URLAUTH access specifier";
+			return -1;
+		}	
+		p = urlext+len;
+	} else if (p == urlext) {
+		parser->error = "Empty URLAUTH access specifier";
+		return -1;	
+	}
+
+	/* parse access */
+	if ((q = strchr(urlext, '+')) == NULL) {
+		/* application */
+		if (url != NULL) {
+			url->uauth_access_application =
+				p_strdup_until(parser->pool, urlext, p);
+		}
+	} else {
+		/* application "+" enc-user */
+		if (urlext == q) {
+			parser->error = "Empty URLAUTH access application";
+			return -1;
+		}
+		if (q+1 == p) {
+			parser->error = t_strdup_printf(
+				"Empty URLAUTH access user for `%s' application",
+				t_strdup_until(urlext, q));
+			return -1;
+		}
+		if (!uri_data_decode(parser, q+1, p, &data))
+			return -1;
+		if (url != NULL) {
+			url->uauth_access_application =
+				p_strdup_until(parser->pool, urlext, q);
+			url->uauth_access_user = p_strdup(parser->pool, data);
+		}
+	}
+
+	if (url != NULL) {
+		/* get rump url */
+		if ((url_parser->flags & IMAP_URL_PARSE_SCHEME_EXTERNAL) == 0) {
+			url->uauth_rumpurl = p_strdup_until(parser->pool,
+				parser->begin, parser->end-strlen(p));
+		} else {
+			url->uauth_rumpurl = p_strconcat(parser->pool, "imap:",
+				t_strdup_until(parser->begin, parser->end-strlen(p)),
+				NULL);
+		}
+	}
+
+	if (*p == '\0') {
+		/* rump url; caller should check whether this is appropriate */
+		return 1;
+	}
+
+	/* iua-verifier     = ":" uauth-mechanism ":" enc-urlauth */
+
+	q = p + 1;
+	if (*q == '\0') {
+		parser->error = "Missing URLAUTH verifier";
+		return -1;
+	}
+	if ((p = strchr(q, ':')) == NULL || p[1] == '\0') {
+		parser->error = "Missing URLAUTH token";
+		return -1;
+	}
+	if (p == q) {
+		parser->error = "Missing URLAUTH mechanism";
+		return -1;
+	}
+	if (url != NULL) {
+		/* get mechanism */
+		url->uauth_mechanism = p_strdup_until(parser->pool, q, p);
+	}
+
+	/* enc-urlauth      = 32*HEXDIG */
+
+	q = p+1;
+	if (strlen(q) < 32) {
+		parser->error = "Too short URLAUTH token";
+		return -1;
+	}
+
+	uauth_token = t_buffer_create(64);
+	if (hex_to_binary(q, uauth_token) < 0) {
+		parser->error = "Invalid URLAUTH token";
+		return -1;
+	}
+
+	if (url != NULL) {
+		url->uauth_token = uauth_token->data;
+		url->uauth_token_size = uauth_token->used;
+	}
+	return 1;
+}
+
+static int
+imap_url_parse_path(struct imap_url_parser *url_parser,
+		    const char *const *path, int relative,
+		    bool *is_messagelist_r)
+{
+	struct uri_parser *parser = &url_parser->parser;
+	struct imap_url *url = url_parser->url;
+	const char *const *segment;
+	string_t *mailbox, *section = NULL;
+	uint32_t uid = 0, uidvalidity = 0;
+	uoff_t partial_offset = 0, partial_size = 0;
+	bool have_partial = FALSE;
+	const char *p, *value, *urlext = NULL;
+	bool mailbox_endslash = FALSE, section_endslash = FALSE;
+	int ret;
+
+	/* icommand         = imessagelist /
+	 *                    imessagepart [iurlauth]
+	 * imessagelist     = imailbox-ref [ "?" enc-search ]
+	 *                    ; "enc-search" is [URI-GEN] "query".
+	 * imessagepart     = imailbox-ref iuid [isection] [ipartial]
+	 * imailbox-ref     = enc-mailbox [uidvalidity]
+	 * uidvalidity      = ";UIDVALIDITY=" nz-number
+	 * iuid             = "/" iuid-only
+	 * iuid-only        = ";UID=" nz-number
+	 *                    ; See [IMAP4] for "nz-number" definition
+	 * isection         = "/" isection-only
+	 * isection-only    = ";SECTION=" enc-section
+	 * ipartial         = "/" ipartial-only
+	 * ipartial-only    = ";PARTIAL=" partial-range
+	 * enc-mailbox      = 1*bchar
+	 *                    ; %-encoded version of [IMAP4] "mailbox"
+	 * enc-section      = 1*bchar
+	 *                    ; %-encoded version of [IMAP4] "section-spec"
+	 * partial-range    = number ["." nz-number]
+	 *                    ; partial FETCH.  The first number is
+	 *                    ; the offset of the first byte,
+	 *                    ; the second number is the length of
+	 *                    ; the fragment.
+	 */
+
+	/* IMAP URL syntax is quite horrible to parse. It relies upon the
+	   generic URI path resolution, but the icommand syntax also relies on
+	   ';' separators. We use the generic URI path parse functions to
+	   adhere to the URI path resolution rules and glue back together path
+	   segments when these are part of the same (mailbox or section) value.
+	*/
+
+	mailbox = t_str_new(256);
+	segment = path;
+
+	/* Resolve relative URI path; determine what to copy from the base URI */
+	if (url != NULL && url_parser->base != NULL && relative > 0) {
+		const struct imap_url *base = url_parser->base;
+		int rel = relative;
+
+		/* /;PARTIAL= */
+		if (base->have_partial && --rel <= 0) {
+			have_partial = base->have_partial;
+			partial_offset = base->partial_offset;
+			partial_size = base->partial_size;
+		}
+		/* /;SECTION= */
+		if (base->section != NULL) {
+			p = base->section + strlen(base->section);
+			/* determine what to retain from base section path */
+			for (; p > base->section && rel > 0; p--) {
+				if (*p =='/' && --rel <= 0) break; 
+			}
+			if (--rel <= 0 && p > base->section) {
+				if (p[-1] == '/') section_endslash = TRUE;
+				if (section == NULL)
+					section = t_str_new(256);
+				str_append_data(section, base->section, p-base->section);
+			}
+		}
+		/* /;UID= */
+		if (base->uid > 0 && --rel <= 0) {
+			uid = base->uid;
+		}
+		/* /mail/box;UIDVALIDITY= */
+		if (base->mailbox != NULL) {
+			uidvalidity = base->uidvalidity;
+			p = base->mailbox + strlen(base->mailbox);
+			/* mailbox has implicit trailing '/' */
+			if (p[-1] != '/' && base->uid == 0 && rel > 0)
+				rel--;
+			/* determine what to retain from base mailbox path */
+			for (; p > base->mailbox && rel > 0; p--) {
+				if (*p =='/') {
+					uidvalidity = 0;
+					if (--rel <= 0)
+						break;
+				}
+			}
+			if (--rel <= 0 && p > base->mailbox) {
+				if (p[-1] == '/')
+					mailbox_endslash = TRUE;
+				str_append_data(mailbox, base->mailbox,
+						p - base->mailbox);
+			}
+		}
+	}
+
+	/* Scan for last mailbox-ref segment */
+	if (segment != NULL) {
+		if (relative == 0 || (!have_partial && section == NULL)) {
+			p = NULL;
+			while (*segment != NULL) {
+				/* ';' must be pct-encoded; if it is not, this is
+					 either the last mailbox-ref path segment containing
+					 ';UIDVALIDITY=' or the subsequent iuid ';UID=' path
+					 segment */
+				if ((p = strchr(*segment, ';')) != NULL)
+					break;
+
+				if (**segment != '\0') {
+					if (segment > path ||
+							(!mailbox_endslash && str_len(mailbox) > 0))
+						str_append_c(mailbox, '/');
+					if (!uri_data_decode(parser, *segment, NULL, &value))
+						return -1;
+					str_append(mailbox, value);
+					mailbox_endslash = FALSE;
+				}
+				segment++;
+			}
+
+			/* Handle ';' */
+			if (p != NULL) {
+				/* [uidvalidity] */
+				if (strncasecmp(p, ";UIDVALIDITY=", 13) == 0) {
+					/* append last bit of mailbox */
+					if (*segment != p) {
+						if (segment > path ||
+								(!mailbox_endslash && str_len(mailbox) > 0))
+							str_append_c(mailbox, '/');
+						if (!uri_data_decode(parser, *segment, p, &value))
+							return -1;
+						str_append(mailbox, value);
+					}
+
+					/* ";UIDVALIDITY=" nz-number */
+					if (strchr(p+13, ';') != NULL) {
+						parser->error = "Encountered stray ';' after UIDVALIDITY";
+						return -1;
+					}
+
+					/* nz-number */
+					if (p[13] == '\0') {
+						parser->error = "Empty UIDVALIDITY value";
+						return -1;
+					}
+					if (imap_url_parse_number(parser, p+13, &uidvalidity) <= 0)
+						return -1;
+					if (uidvalidity == 0) {
+						parser->error = "UIDVALIDITY cannot be zero";
+						return -1;
+					}
+					segment++;
+				} else if (p != *segment) {
+					parser->error = "Encountered stray ';' in mailbox reference";
+					return -1;
+				}
+			}
+
+			/* iuid */
+		 	if (*segment != NULL && strncasecmp(*segment, ";UID=", 5) == 0) {
+				/* ";UID=" nz-number */
+				value = (*segment)+5;
+				if ((p = strchr(value,';')) != NULL) {
+					if (segment[1] != NULL ) {
+						/* not the last segment, so it cannot be extension like iurlauth */
+						parser->error = "Encountered stray ';' in UID path segment";
+						return -1;
+					}
+					urlext = p;
+					value = t_strdup_until(value, p);
+				}
+				/* nz-number */
+				if (*value == '\0') {
+					parser->error = "Empty UID value";
+					return -1;
+				}
+				if (imap_url_parse_number(parser, value, &uid) <= 0)
+					return -1;
+				if (uid == 0) {
+					parser->error = "UID cannot be zero";
+					return -1;
+				}
+				segment++;
+			}
+		}
+
+		/* [isection] [ipartial] */
+		if (*segment != NULL && uid > 0) {
+			/* [isection] */
+			if (section != NULL ||
+				  strncasecmp(*segment, ";SECTION=", 9) == 0) {
+				/* ";SECTION=" enc-section */
+				if (section == NULL) {
+					section = t_str_new(256);
+					value = (*segment) + 9;
+				} else {
+					value = *segment;
+				}
+
+				/* enc-section can contain slashes, so we merge path segments until one
+					 contains ';' */
+				while ((p = strchr(value,';')) == NULL) {
+					if (!section_endslash && str_len(section) > 0)
+						str_append_c(section, '/');
+					if (*value != '\0') {
+						if (!uri_data_decode(parser, value, NULL, &value))
+							return -1;
+						str_append(section, value);
+						section_endslash = FALSE;
+					}
+
+					segment++;
+					if (*segment == NULL)
+						break;
+					value = *segment;
+				}
+
+				if (p != NULL) {
+					/* found ';' */
+					if (p != value) {
+						/* it is not at the beginning of the path segment */
+						if (segment[1] != NULL) {
+							/* not the last segment, so it cannot be extension like iurlauth */
+							parser->error = "Encountered stray ';' in SECTION path segment";
+							return -1;
+						}
+						urlext = p;
+						value = t_strdup_until(value, p);
+						if (!section_endslash && str_len(section) > 0)
+							str_append_c(section, '/');
+						if (!uri_data_decode(parser, value, NULL, &value))
+							return -1;
+						str_append(section, value);
+						segment++;
+					}
+				}
+
+				if (str_len(section) == 0) {
+					parser->error = "Empty SECTION value";
+					return -1;
+				}
+			}
+
+			/* [ipartial] */
+			if (*segment != NULL &&
+				  strncasecmp(*segment, ";PARTIAL=", 9) == 0) {
+				have_partial = TRUE;
+
+				/* ";PARTIAL=" partial-range */
+				value = (*segment) + 9;
+				if ((p = strchr(value,';')) != NULL) {
+					urlext = p;
+					value = t_strdup_until(value, p);
+				}
+				if (*value == '\0') {
+					parser->error = "Empty PARTIAL value";
+					return -1;
+				}
+				/* partial-range = number ["." nz-number] */
+				if ((p = strchr(value,'.')) != NULL) {
+					if (p[1] == '\0') {
+						parser->error = "Empty PARTIAL size";
+						return -1;
+					}
+					if (imap_url_parse_offset(parser, p+1, &partial_size) <= 0)
+						return -1;
+					if (partial_size == 0) {
+						parser->error = "PARTIAL size cannot be zero";
+						return -1;
+					}
+					value = t_strdup_until(value, p);
+					if (*value == '\0') {
+						parser->error = "Empty PARTIAL offset";
+						return -1;
+					}
+				}
+				if (imap_url_parse_offset(parser,value, &partial_offset) <= 0)
+					return -1;
+				segment++;
+			}
+		}
+
+		if (*segment != NULL) {
+			if (urlext != NULL || **segment != '\0' || *(segment+1) != NULL ) {
+				parser->error = t_strdup_printf(
+					"Unexpected IMAP URL path segment: `%s'",
+					str_sanitize(*segment, 80));
+				return -1;
+			}
+		}
+	}
+
+	/* ";" {...} at end of URL */ 
+	if (urlext != NULL) {
+		/* [iurlauth] */
+		if ((ret = imap_url_parse_urlauth(url_parser, urlext)) < 0)
+			return ret;
+		else if (ret == 0) {
+			/* something else */
+			parser->error = t_strdup_printf(
+				"Unrecognized IMAP URL extension: %s",
+				str_sanitize(urlext, 80));
+			return -1;
+		}
+	}
+
+	if (is_messagelist_r != NULL)
+		*is_messagelist_r = (uid == 0);
+
+	if (url != NULL) {
+		if (str_len(mailbox) > 0)
+			url->mailbox = p_strdup(parser->pool, str_c(mailbox));
+		url->uidvalidity = uidvalidity;
+		url->uid = uid;
+		if (section != NULL)
+			url->section = p_strdup(parser->pool, str_c(section));
+		url->have_partial = have_partial;
+		url->partial_offset = partial_offset;
+		url->partial_size = partial_size;
+	}
+	return 1;
+}
+
+static bool imap_url_do_parse(struct imap_url_parser *url_parser)
+{
+	struct uri_parser *parser = &url_parser->parser;
+	const char *const *path;
+	bool is_messagelist = FALSE;
+	bool have_scheme = FALSE;
+	int relative;
+	const char *query;
+	int ret, sret;
+
+	/*
+	 * imapurl          = "imap://" iserver ipath-query
+	 * 	                 ; Defines an absolute IMAP URL
+	 * iserver          = [iuserinfo "@"] host [":" port]
+	 *                    ; This is the same as "authority" defined
+	 *                    ; in [URI-GEN].
+	 * ipath-query      = ["/" [ icommand ]]
+	 * 	                 ; Corresponds to "path-abempty [ "?" query ]" in
+	 * 	                 ; [URI-GEN]
+	 * icommand         = imessagelist /
+	 *                    imessagepart [iurlauth]
+	 * imessagelist     = imailbox-ref [ "?" enc-search ]
+	 *                    ; "enc-search" is [URI-GEN] "query".
+	 * imessagepart     = imailbox-ref iuid [isection] [ipartial]
+	 * enc-search       = 1*bchar
+	 *                    ; %-encoded version of [IMAPABNF]
+	 *                    ; "search-program".  Note that IMAP4
+	 *                    ; literals may not be used in
+	 *                    ; a "search-program", i.e., only
+	 *                    ; quoted or non-synchronizing
+	 *                    ; literals (if the server supports
+	 *                    ; LITERAL+ [LITERAL+]) are allowed.
+	 */
+
+	/* "imap:" */
+	if ((url_parser->flags & IMAP_URL_PARSE_SCHEME_EXTERNAL) == 0) {
+		const char *scheme;
+
+		if (uri_parse_scheme(parser, &scheme) <= 0) {
+			parser->cur = parser->begin;
+		} else {
+			if (strcasecmp(scheme, "imap") != 0) {
+				parser->error = "Not an IMAP URL";
+				return FALSE;
+			}
+			have_scheme = TRUE;
+		}
+	} else {
+		have_scheme = TRUE;
+	}
+
+	/* "//" iserver */
+	if ((sret = imap_url_parse_iserver(url_parser)) < 0)
+		return FALSE;
+
+	if (have_scheme && sret == 0) {
+		parser->error = "Absolute IMAP URL requires `//' after `imap:'";
+		return FALSE;
+	}
+
+	if (sret > 0 &&
+	    (url_parser->flags & IMAP_URL_PARSE_REQUIRE_RELATIVE) != 0) {
+		parser->error = "Relative URL required";
+		return FALSE;
+	}
+
+	/* ipath-query      = ["/" [ icommand ]]  ; excludes `[ "?" enc-search ]` */
+	if ((ret = uri_parse_path(parser, &relative, &path)) < 0)
+		return FALSE;
+
+	/* Relative urls are only valid when we have a base url */
+	if (sret == 0) {
+		if (url_parser->base == NULL) {
+			parser->error = "Relative URL not allowed";
+			return FALSE;
+		} else if (url_parser->url != NULL) {
+			struct imap_url *url = url_parser->url;
+			const struct imap_url *base = url_parser->base;
+
+			uri_host_copy(parser->pool, &url->host, &base->host);
+			url->port = base->port;
+			url->userid = p_strdup_empty(parser->pool, base->userid);
+			url->auth_type = p_strdup_empty(parser->pool, base->auth_type);
+		}
+
+		url_parser->relative = TRUE;
+	}
+
+	/* Parse path, i.e. `[ icommand ]` from `*( "/" segment )` */
+	if (ret > 0 || url_parser->relative) {
+		if (imap_url_parse_path(url_parser, path, relative,
+					&is_messagelist) < 0)
+			return FALSE;
+	}
+
+	/* [ "?" enc-search ] */
+	if ((ret = uri_parse_query(parser, &query)) != 0) {
+		if (ret < 0)
+			return FALSE;
+
+		if (!is_messagelist) {
+			parser->error =
+				"Search query part only valid for messagelist-type IMAP URL";
+			return FALSE;
+		} else if (*query == '\0') {
+			parser->error = "Empty IMAP URL search query not allowed";
+			return FALSE;
+		}
+
+		if (url_parser->url != NULL) {
+			if (!uri_data_decode(parser, query, NULL, &query))
+				return FALSE;
+			url_parser->url->search_program =
+				p_strdup(parser->pool, query);
+		}
+	}
+
+	/* IMAP URL has no fragment */
+	if ((ret = uri_parse_fragment(parser, &query)) != 0) {
+		if (ret == 1)
+			parser->error = "Fragment component not allowed in IMAP URL";
+		return FALSE;
+	}
+
+	/* must be at end of URL now */
+	i_assert(parser->cur == parser->end);
+
+	return TRUE;
+}
+
+/* Public API */
+
+int imap_url_parse(const char *url, const struct imap_url *base,
+		   enum imap_url_parse_flags flags,
+		   struct imap_url **url_r, const char **error_r)
+{
+	struct imap_url_parser url_parser;
+
+	/* base != NULL indicates whether relative URLs are allowed. However, certain
+	   flags may also dictate whether relative URLs are allowed/required. */
+	i_assert((flags & IMAP_URL_PARSE_REQUIRE_RELATIVE) == 0 || base != NULL);
+	i_assert((flags & IMAP_URL_PARSE_SCHEME_EXTERNAL) == 0 || base == NULL);
+
+	i_zero(&url_parser);
+	uri_parser_init(&url_parser.parser, pool_datastack_create(), url);
+
+	url_parser.url = t_new(struct imap_url, 1);
+	url_parser.url->uauth_expire = (time_t)-1;
+	url_parser.base = base;
+	url_parser.flags = flags;
+
+	if (!imap_url_do_parse(&url_parser)) {
+		*error_r = url_parser.parser.error;
+		return -1;
+	}
+	*url_r = url_parser.url;
+	return 0;
+}
+
+/*
+ * IMAP URL construction
+ */
+
+static void
+imap_url_append_mailbox(const struct imap_url *url, string_t *urlstr)
+{
+	uri_append_path_data(urlstr, ";", url->mailbox);
+	if (url->uidvalidity != 0)
+		str_printfa(urlstr, ";UIDVALIDITY=%u", url->uidvalidity);
+	if (url->uid == 0) {
+		/* message list */
+		if (url->search_program != NULL) {
+			str_append_c(urlstr, '?');
+			uri_append_query_data(urlstr, ";", url->search_program);
+		}
+	} else {
+		/* message part */
+		str_printfa(urlstr, "/;UID=%u", url->uid);
+		if (url->section != NULL) {
+			str_append(urlstr, "/;SECTION=");
+			uri_append_path_data(urlstr, ";", url->section);
+		}
+		if (url->have_partial) {
+			str_append(urlstr, "/;PARTIAL=");
+			if (url->partial_size == 0) {
+				str_printfa(urlstr, "%"PRIuUOFF_T,
+					    url->partial_offset);
+			} else {
+				str_printfa(urlstr, "%"PRIuUOFF_T".%"PRIuUOFF_T,
+					    url->partial_offset,
+					    url->partial_size);
+			}
+		}
+
+		/* urlauth */
+		if (url->uauth_access_application != NULL) {
+			if (url->uauth_expire != (time_t)-1) {
+				str_append(urlstr, ";EXPIRE=");
+				str_append(urlstr, iso8601_date_create(url->uauth_expire));
+			}
+			str_append(urlstr, ";URLAUTH=");
+			str_append(urlstr, url->uauth_access_application);
+			if (url->uauth_access_user != NULL) {
+				str_append_c(urlstr, '+');
+				uri_append_user_data(urlstr, ";",
+						     url->uauth_access_user);
+			}
+		}
+	}
+}
+
+const char *imap_url_create(const struct imap_url *url)
+{
+	string_t *urlstr = t_str_new(512);
+
+	/* scheme */
+	uri_append_scheme(urlstr, "imap");
+	str_append(urlstr, "//");
+
+	/* user */
+	if (url->userid != NULL || url->auth_type != NULL) {
+		if (url->userid != NULL)
+			uri_append_user_data(urlstr, ";:", url->userid);
+		if (url->auth_type != NULL) {
+			str_append(urlstr, ";AUTH=");
+			uri_append_user_data(urlstr, ";:", url->auth_type);
+		}
+		str_append_c(urlstr, '@');
+	}
+
+	/* server */
+	uri_append_host(urlstr, &url->host);
+	uri_append_port(urlstr, url->port);
+
+	/* Older syntax (RFC 2192) requires this slash at all times */
+	str_append_c(urlstr, '/');
+
+	/* mailbox */
+	if (url->mailbox != NULL)
+		imap_url_append_mailbox(url, urlstr);
+	return str_c(urlstr);
+}
+
+const char *
+imap_url_add_urlauth(const char *rumpurl, const char *mechanism,
+		     const unsigned char *token, size_t token_len)
+{
+	return t_strconcat(rumpurl, ":", t_str_lcase(mechanism), ":",
+			   binary_to_hex(token, token_len), NULL);
+}
diff --git a/src/lib-imap/imap-url.h b/src/lib-imap/imap-url.h
new file mode 100644
index 0000000..9f0b2aa
--- /dev/null
+++ b/src/lib-imap/imap-url.h
@@ -0,0 +1,71 @@
+#ifndef IMAP_URL_H
+#define IMAP_URL_H
+
+#include "uri-util.h"
+
+struct imap_url {
+	/* server */
+	struct uri_host host;
+	in_port_t port;
+
+	/* user */
+	const char *userid;
+	const char *auth_type;
+
+	/* mailbox */
+	const char *mailbox;
+	uint32_t uidvalidity;  /* 0 if not set */
+
+	/* message part */
+	uint32_t uid;
+	const char *section;
+	uoff_t partial_offset;
+	uoff_t partial_size; /* 0 if not set */
+
+	/* message list (uid == 0) */
+	const char *search_program;
+
+	/* urlauth */
+	const char *uauth_rumpurl;
+	const char *uauth_access_application;
+	const char *uauth_access_user;
+	const char *uauth_mechanism;
+	const unsigned char *uauth_token;
+	size_t uauth_token_size;
+	time_t uauth_expire; /* (time_t)-1 if not set */
+
+	bool have_partial:1;
+};
+
+/*
+ * IMAP URL parsing
+ */
+
+enum imap_url_parse_flags {
+	/* Scheme part 'imap:' is already parsed externally. This implies that
+	   this is an absolute IMAP URL. */
+	IMAP_URL_PARSE_SCHEME_EXTERNAL	= 0x01,
+	/* Require relative URL (omitting _both_ scheme and authority), e.g.
+	   /MAILBOX/;UID=uid or even ;UID=uid. This flag means that an absolute
+	   URL makes no sense in this context. Relative URLs are allowed once a
+	   base URL is provided to the parser. */
+	IMAP_URL_PARSE_REQUIRE_RELATIVE	= 0x02,
+	/* Allow URLAUTH URL */
+	IMAP_URL_PARSE_ALLOW_URLAUTH	= 0x04
+};
+
+/* Parses full IMAP URL. The returned URL is allocated from data stack. */
+int imap_url_parse(const char *url, const struct imap_url *base,
+		   enum imap_url_parse_flags flags,
+		   struct imap_url **url_r, const char **error_r);
+
+/*
+ * IMAP URL construction
+ */
+
+const char *imap_url_create(const struct imap_url *url);
+
+const char *imap_url_add_urlauth(const char *rumpurl, const char *mechanism,
+				 const unsigned char *token, size_t token_len);
+
+#endif
diff --git a/src/lib-imap/imap-utf7.c b/src/lib-imap/imap-utf7.c
new file mode 100644
index 0000000..7ea53f5
--- /dev/null
+++ b/src/lib-imap/imap-utf7.c
@@ -0,0 +1,380 @@
+/* Copyright (c) 2008-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "str.h"
+#include "unichar.h"
+#include "imap-utf7.h"
+
+static const char imap_b64enc[] =
+	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
+
+#define XX 0xff
+static const unsigned char imap_b64dec[256] = {
+	XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
+	XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
+	XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,62, 63,XX,XX,XX,
+	52,53,54,55, 56,57,58,59, 60,61,XX,XX, XX,XX,XX,XX,
+	XX, 0, 1, 2,  3, 4, 5, 6,  7, 8, 9,10, 11,12,13,14,
+	15,16,17,18, 19,20,21,22, 23,24,25,XX, XX,XX,XX,XX,
+	XX,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
+	41,42,43,44, 45,46,47,48, 49,50,51,XX, XX,XX,XX,XX,
+	XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
+	XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
+	XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
+	XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
+	XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
+	XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
+	XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX,
+	XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX
+};
+
+static void
+mbase64_encode(string_t *dest, const unsigned char *in, size_t len)
+{
+	str_append_c(dest, '&');
+	while (len >= 3) {
+		str_append_c(dest, imap_b64enc[in[0] >> 2]);
+		str_append_c(dest, imap_b64enc[((in[0] & 3) << 4) |
+					       (in[1] >> 4)]);
+		str_append_c(dest, imap_b64enc[((in[1] & 0x0f) << 2) |
+					       ((in[2] & 0xc0) >> 6)]);
+		str_append_c(dest, imap_b64enc[in[2] & 0x3f]);
+		in += 3;
+		len -= 3;
+	}
+	if (len > 0) {
+		str_append_c(dest, imap_b64enc[in[0] >> 2]);
+		if (len == 1)
+			str_append_c(dest, imap_b64enc[(in[0] & 0x03) << 4]);
+		else {
+			str_append_c(dest, imap_b64enc[((in[0] & 0x03) << 4) |
+						       (in[1] >> 4)]);
+			str_append_c(dest, imap_b64enc[(in[1] & 0x0f) << 2]);
+		}
+	}
+	str_append_c(dest, '-');
+}
+
+static const char *
+imap_utf8_first_encode_char(const char *str, char escape_char)
+{
+	const char *p;
+
+	for (p = str; *p != '\0'; p++) {
+		if (*p == '&' || *p < 0x20 || *p >= 0x7f || *p == escape_char)
+			return p;
+	}
+	return NULL;
+}
+
+int imap_escaped_utf8_hex_to_char(const char *str, unsigned char *chr_r)
+{
+	unsigned int i = 0;
+	unsigned char c = 0;
+
+	/* NOTE: Only lowercase hex characters are allowed so the output is
+	   reversible. */
+	for (;;) {
+		if (str[i] >= '0' && str[i] <= '9')
+			c += str[i] - '0';
+		else if (str[i] >= 'a' && str[i] <= 'f')
+			c += str[i] - 'a' + 10;
+		else
+			return -1;
+		if (++i == 2)
+			break;
+		c *= 0x10;
+	}
+	*chr_r = c;
+	return 0;
+}
+
+static int
+imap_utf8_to_utf7_int(const char *src, char escape_char, string_t *dest)
+{
+	const char *p;
+	unichar_t chr;
+	uint8_t *utf16, *u;
+	uint16_t u16;
+	unsigned char c;
+
+	p = imap_utf8_first_encode_char(src, escape_char);
+	if (p == NULL) {
+		/* no characters that need to be encoded */
+		str_append(dest, src);
+		return 0;
+	}
+
+	/* at least one encoded character */
+	str_append_data(dest, src, p-src);
+	utf16 = t_malloc0(MALLOC_MULTIPLY(strlen(p), 2));
+	while (*p != '\0') {
+		if (*p == escape_char &&
+		    imap_escaped_utf8_hex_to_char(p+1, &c) == 0) {
+			str_append_c(dest, c);
+			p += 3;
+			continue;
+		}
+		if (*p == '&') {
+			str_append(dest, "&-");
+			p++;
+			continue;
+		}
+		if (*p >= 0x20 && *p < 0x7f) {
+			str_append_c(dest, *p);
+			p++;
+			continue;
+		}
+
+		u = utf16;
+		while (*p != '\0' && (*p < 0x20 || *p >= 0x7f)) {
+			if (uni_utf8_get_char(p, &chr) <= 0)
+				return -1;
+			/* @UNSAFE */
+			if (chr < UTF16_SURROGATE_BASE) {
+				*u++ = chr >> 8;
+				*u++ = chr & 0xff;
+			} else {
+				u16 = UTF16_SURROGATE_HIGH(chr);
+				*u++ = u16 >> 8;
+				*u++ = u16 & 0xff;
+				u16 = UTF16_SURROGATE_LOW(chr);
+				*u++ = u16 >> 8;
+				*u++ = u16 & 0xff;
+			}
+			p += uni_utf8_char_bytes((unsigned char)*p);
+		}
+		mbase64_encode(dest, utf16, u-utf16);
+	}
+	return 0;
+}
+
+int imap_utf8_to_utf7(const char *src, string_t *dest)
+{
+	return imap_utf8_to_utf7_int(src, '\0', dest);
+}
+
+int imap_escaped_utf8_to_utf7(const char *src, char escape_char, string_t *dest)
+{
+	i_assert(escape_char != '&');
+
+	return imap_utf8_to_utf7_int(src, escape_char, dest);
+}
+
+int t_imap_utf8_to_utf7(const char *src, const char **dest_r)
+{
+	string_t *str;
+	int ret;
+
+	if (imap_utf8_first_encode_char(src, '\0') == NULL) {
+		*dest_r = src;
+		return 0;
+	}
+
+	str = t_str_new(64);
+	ret = imap_utf8_to_utf7(src, str);
+	*dest_r = str_c(str);
+	return ret;
+}
+
+static int utf16buf_to_utf8(string_t *dest, const unsigned char output[4],
+			    unsigned int *_pos, unsigned int len)
+{
+	unsigned int pos = *_pos;
+	uint16_t high, low;
+	unichar_t chr;
+
+	if (len % 2 != 0)
+		return -1;
+	
+	high = (output[pos % 4] << 8) | output[(pos+1) % 4];
+	if (high < UTF16_SURROGATE_HIGH_FIRST ||
+	    high > UTF16_SURROGATE_HIGH_MAX) {
+		/* single byte */
+		size_t oldlen = str_len(dest);
+
+		if (high == 0) {
+			/* Encoded NUL isn't going to work in Dovecot code,
+			   even though it's technically valid. Return failure
+			   so the callers don't even get a chance to handle the
+			   NUL in the string inconsistently. */
+			return -1;
+		}
+		uni_ucs4_to_utf8_c(high, dest);
+		if (str_len(dest) - oldlen == 1) {
+			unsigned char last = str_data(dest)[oldlen];
+			if (last >= 0x20 && last < 0x7f)
+				return -1;
+		}
+		*_pos = (pos + 2) % 4;
+		return 0;
+	}
+
+	if (high > UTF16_SURROGATE_HIGH_LAST)
+		return -1;
+	if (len != 4) {
+		/* missing the second character */
+		return -1;
+	}
+
+	low = (output[(pos+2)%4] << 8) | output[(pos+3) % 4];
+	if (low < UTF16_SURROGATE_LOW_FIRST || low > UTF16_SURROGATE_LOW_LAST)
+		return -1;
+
+	chr = UTF16_SURROGATE_BASE +
+		(((high & UTF16_SURROGATE_MASK) << UTF16_SURROGATE_SHIFT) |
+		 (low & UTF16_SURROGATE_MASK));
+	uni_ucs4_to_utf8_c(chr, dest);
+	return 0;
+}
+
+static int mbase64_decode_to_utf8(string_t *dest, const char **_src)
+{
+	const char *src = *_src;
+	unsigned char input[4], output[4];
+	unsigned int outstart = 0, outpos = 0;
+
+	while (*src != '-') {
+		input[0] = imap_b64dec[(uint8_t)src[0]];
+		if (input[0] == 0xff)
+			return -1;
+		input[1] = imap_b64dec[(uint8_t)src[1]];
+		if (input[1] == 0xff)
+			return -1;
+
+		output[outpos % 4] = (input[0] << 2) | (input[1] >> 4);
+		if (++outpos % 4 == outstart) {
+			if (utf16buf_to_utf8(dest, output, &outstart, 4) < 0)
+				return -1;
+		}
+
+		input[2] = imap_b64dec[(uint8_t)src[2]];
+		if (input[2] == 0xff) {
+			if (src[2] != '-')
+				return -1;
+
+			src += 2;
+			break;
+		}
+
+		output[outpos % 4] = ((input[1] << 4) & 0xff) | (input[2] >> 2);
+		if (++outpos % 4 == outstart) {
+			if (utf16buf_to_utf8(dest, output, &outstart, 4) < 0)
+				return -1;
+		}
+
+		input[3] = imap_b64dec[(uint8_t)src[3]];
+		if (input[3] == 0xff) {
+			if (src[3] != '-')
+				return -1;
+
+			src += 3;
+			break;
+		}
+
+		output[outpos % 4] = ((input[2] << 6) & 0xc0) | input[3];
+		if (++outpos % 4 == outstart) {
+			if (utf16buf_to_utf8(dest, output, &outstart, 4) < 0)
+				return -1;
+		}
+
+		src += 4;
+	}
+	if (outstart != outpos % 4) {
+		if (utf16buf_to_utf8(dest, output, &outstart,
+				     (4 + outpos - outstart) % 4) < 0)
+			return -1;
+	}
+
+	/* Found the ending '-'. Make sure it's not followed by unnecessary
+	   shift. Note that '&' is always escaped as "&-" so it's not an
+	   unnecessary shift. */
+	if (src[1] == '&' && src[2] != '-')
+		return -1;
+
+	*_src = src + 1;
+	return 0;
+}
+
+static int
+imap_utf7_to_utf8_int(const char *src, const char *escape_chars, string_t *dest)
+{
+	const char *p;
+
+	for (p = src; *p != '\0'; p++) {
+		if (*p < 0x20 || *p >= 0x7f) {
+			if (escape_chars[0] == '\0')
+				return -1;
+			break;
+		}
+		if (*p == '&' || strchr(escape_chars, *p) != NULL)
+			break;
+	}
+	if (*p == '\0') {
+		/* no IMAP-UTF-7 encoded characters */
+		str_append(dest, src);
+		return 0;
+	}
+
+	/* at least one encoded character */
+	str_append_data(dest, src, p-src);
+	while (*p != '\0') {
+		if (strchr(escape_chars, *p) != NULL ||
+		    *p < 0x20 || *p >= 0x7f) {
+			str_printfa(dest, "%c%02x", escape_chars[0],
+				    (unsigned char)*p);
+			p++;
+		} else if (*p == '&') {
+			if (*++p == '-') {
+				str_append_c(dest, '&');
+				p++;
+			} else {
+				size_t orig_size = str_len(dest);
+				if (mbase64_decode_to_utf8(dest, &p) < 0) {
+					if (escape_chars[0] == '\0')
+						return -1;
+					str_truncate(dest, orig_size);
+					str_printfa(dest, "%c26", escape_chars[0]);
+				}
+			}
+		} else {
+			str_append_c(dest, *p++);
+		}
+	}
+	return 0;
+}
+
+int imap_utf7_to_utf8(const char *src, string_t *dest)
+{
+	return imap_utf7_to_utf8_int(src, "", dest);
+}
+
+void imap_utf7_to_utf8_escaped(const char *src, const char *escape_chars,
+			       string_t *dest)
+{
+	i_assert(escape_chars[0] != '&');
+
+	if (imap_utf7_to_utf8_int(src, escape_chars, dest) < 0)
+		i_unreached();
+}
+
+bool imap_utf7_is_valid(const char *src)
+{
+	const char *p;
+	int ret;
+
+	for (p = src; *p != '\0'; p++) {
+		if (*p < 0x20 || *p >= 0x7f)
+			return FALSE;
+		if (*p == '&') {
+			/* slow scan */
+			T_BEGIN {
+				string_t *tmp = t_str_new(128);
+				ret = imap_utf7_to_utf8(p, tmp);
+			} T_END;
+			if (ret < 0)
+				return FALSE;
+		}
+	}
+	return TRUE;
+}
diff --git a/src/lib-imap/imap-utf7.h b/src/lib-imap/imap-utf7.h
new file mode 100644
index 0000000..d7ae306
--- /dev/null
+++ b/src/lib-imap/imap-utf7.h
@@ -0,0 +1,28 @@
+#ifndef IMAP_UTF7_H
+#define IMAP_UTF7_H
+
+/* Convert an UTF-8 string to IMAP-UTF-7. Returns 0 if ok, -1 if src isn't
+   valid UTF-8. */
+int imap_utf8_to_utf7(const char *src, string_t *dest);
+int t_imap_utf8_to_utf7(const char *src, const char **dest_r);
+/* Like imap_utf8_to_utf7(), but decode all <escape_char><hex> instances.
+   Returns -1 if src isn't valid UTF-8. Note that invalid <escape_char> content
+   isn't treated as an error - it's simply passed through. */
+int imap_escaped_utf8_to_utf7(const char *src, char escape_char, string_t *dest);
+/* For manually parsing the <hex> after <escape_char>. Returns 0 on success,
+   -1 if str doesn't point to valid <hex>. */
+int imap_escaped_utf8_hex_to_char(const char *str, unsigned char *chr_r);
+
+/* Convert IMAP-UTF-7 string to UTF-8. Returns 0 if ok, -1 if src isn't
+   valid IMAP-UTF-7. */
+int imap_utf7_to_utf8(const char *src, string_t *dest);
+/* Like imap_utf7_to_utf8(), but write invalid input as <escape_chars[0]><hex>.
+   All the characters in escape_chars[] are escaped in the same way. This
+   allows converting the escaped output back to the original (broken)
+   IMAP-UTF-7 input. */
+void imap_utf7_to_utf8_escaped(const char *src, const char *escape_chars,
+			       string_t *dest);
+/* Returns TRUE if the string is valid IMAP-UTF-7 string. */
+bool imap_utf7_is_valid(const char *src);
+
+#endif
diff --git a/src/lib-imap/imap-util.c b/src/lib-imap/imap-util.c
new file mode 100644
index 0000000..dc1ae24
--- /dev/null
+++ b/src/lib-imap/imap-util.c
@@ -0,0 +1,202 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "str.h"
+#include "strescape.h"
+#include "unichar.h"
+#include "mail-types.h"
+#include "imap-parser.h"
+#include "imap-util.h"
+
+void imap_write_flags(string_t *dest, enum mail_flags flags,
+		      const char *const *keywords)
+{
+	size_t size;
+
+	size = str_len(dest);
+	if ((flags & MAIL_ANSWERED) != 0)
+		str_append(dest, "\\Answered ");
+	if ((flags & MAIL_FLAGGED) != 0)
+		str_append(dest, "\\Flagged ");
+	if ((flags & MAIL_DELETED) != 0)
+		str_append(dest, "\\Deleted ");
+	if ((flags & MAIL_SEEN) != 0)
+		str_append(dest, "\\Seen ");
+	if ((flags & MAIL_DRAFT) != 0)
+		str_append(dest, "\\Draft ");
+	if ((flags & MAIL_RECENT) != 0)
+		str_append(dest, "\\Recent ");
+
+	if (keywords != NULL) {
+		/* we have keywords too */
+		while (*keywords != NULL) {
+			str_append(dest, *keywords);
+			str_append_c(dest, ' ');
+			keywords++;
+		}
+	}
+
+	if (str_len(dest) != size)
+		str_truncate(dest, str_len(dest)-1);
+}
+
+enum mail_flags imap_parse_system_flag(const char *str)
+{
+	if (strcasecmp(str, "\\Answered") == 0)
+		return MAIL_ANSWERED;
+	else if (strcasecmp(str, "\\Flagged") == 0)
+		return MAIL_FLAGGED;
+	else if (strcasecmp(str, "\\Deleted") == 0)
+		return MAIL_DELETED;
+	else if (strcasecmp(str, "\\Seen") == 0)
+		return MAIL_SEEN;
+	else if (strcasecmp(str, "\\Draft") == 0)
+		return MAIL_DRAFT;
+	else if (strcasecmp(str, "\\Recent") == 0)
+		return MAIL_RECENT;
+	else
+		return 0;
+}
+
+void imap_write_seq_range(string_t *dest, const ARRAY_TYPE(seq_range) *array)
+{
+	const struct seq_range *range;
+	unsigned int i, count;
+
+	range = array_get(array, &count);
+	for (i = 0; i < count; i++) {
+		if (i > 0)
+			str_append_c(dest, ',');
+		str_printfa(dest, "%u", range[i].seq1);
+		if (range[i].seq1 != range[i].seq2)
+			str_printfa(dest, ":%u", range[i].seq2);
+	}
+}
+
+void imap_write_arg(string_t *dest, const struct imap_arg *arg)
+{
+	switch (arg->type) {
+	case IMAP_ARG_NIL:
+		str_append(dest, "NIL");
+		break;
+	case IMAP_ARG_ATOM:
+		str_append(dest, imap_arg_as_astring(arg));
+		break;
+	case IMAP_ARG_STRING: {
+		const char *strarg = imap_arg_as_astring(arg);
+		str_append_c(dest, '"');
+		str_append_escaped(dest, strarg, strlen(strarg));
+		str_append_c(dest, '"');
+		break;
+	}
+	case IMAP_ARG_LITERAL: {
+		const char *strarg = imap_arg_as_astring(arg);
+		str_printfa(dest, "{%zu}\r\n",
+			    strlen(strarg));
+		str_append(dest, strarg);
+		break;
+	}
+	case IMAP_ARG_LIST:
+		str_append_c(dest, '(');
+		imap_write_args(dest, imap_arg_as_list(arg));
+		str_append_c(dest, ')');
+		break;
+	case IMAP_ARG_LITERAL_SIZE:
+	case IMAP_ARG_LITERAL_SIZE_NONSYNC:
+		str_printfa(dest, "<%"PRIuUOFF_T" byte literal>",
+			    imap_arg_as_literal_size(arg));
+		break;
+	case IMAP_ARG_EOL:
+		i_unreached();
+	}
+}
+
+void imap_write_args(string_t *dest, const struct imap_arg *args)
+{
+	bool first = TRUE;
+
+	for (; !IMAP_ARG_IS_EOL(args); args++) {
+		if (first)
+			first = FALSE;
+		else
+			str_append_c(dest, ' ');
+		imap_write_arg(dest, args);
+	}
+}
+
+static void imap_human_args_fix_control_chars(char *str)
+{
+	size_t i;
+
+	for (i = 0; str[i] != '\0'; i++) {
+		if (str[i] < 0x20 || str[i] == 0x7f)
+			str[i] = '?';
+	}
+}
+
+void imap_write_args_for_human(string_t *dest, const struct imap_arg *args)
+{
+	bool first = TRUE;
+
+	for (; !IMAP_ARG_IS_EOL(args); args++) {
+		if (first)
+			first = FALSE;
+		else
+			str_append_c(dest, ' ');
+
+		switch (args->type) {
+		case IMAP_ARG_NIL:
+			str_append(dest, "NIL");
+			break;
+		case IMAP_ARG_ATOM:
+			/* atom has only printable us-ascii chars */
+			str_append(dest, imap_arg_as_astring(args));
+			break;
+		case IMAP_ARG_STRING:
+		case IMAP_ARG_LITERAL: {
+			const char *strarg = imap_arg_as_astring(args);
+
+			if (strpbrk(strarg, "\r\n") != NULL) {
+				str_printfa(dest, "<%zu byte multi-line literal>",
+					    strlen(strarg));
+				break;
+			}
+			strarg = str_escape(strarg);
+
+			str_append_c(dest, '"');
+			size_t start_pos = str_len(dest);
+			/* append only valid UTF-8 chars */
+			if (uni_utf8_get_valid_data((const unsigned char *)strarg,
+						    strlen(strarg), dest))
+				str_append(dest, strarg);
+			/* replace all control chars */
+			imap_human_args_fix_control_chars(
+				str_c_modifiable(dest) + start_pos);
+			str_append_c(dest, '"');
+			break;
+		}
+		case IMAP_ARG_LIST:
+			str_append_c(dest, '(');
+			imap_write_args_for_human(dest, imap_arg_as_list(args));
+			str_append_c(dest, ')');
+			break;
+		case IMAP_ARG_LITERAL_SIZE:
+		case IMAP_ARG_LITERAL_SIZE_NONSYNC:
+			str_printfa(dest, "<%"PRIuUOFF_T" byte literal>",
+				    imap_arg_as_literal_size(args));
+			break;
+		case IMAP_ARG_EOL:
+			i_unreached();
+		}
+	}
+}
+
+const char *imap_args_to_str(const struct imap_arg *args)
+{
+	string_t *str;
+
+	str = t_str_new(128);
+	imap_write_args(str, args);
+	return str_c(str);
+}
diff --git a/src/lib-imap/imap-util.h b/src/lib-imap/imap-util.h
new file mode 100644
index 0000000..47b7d2c
--- /dev/null
+++ b/src/lib-imap/imap-util.h
@@ -0,0 +1,29 @@
+#ifndef IMAP_UTIL_H
+#define IMAP_UTIL_H
+
+#include "seq-range-array.h"
+#include "mail-types.h"
+
+struct imap_arg;
+
+/* Write flags as a space separated string. */
+void imap_write_flags(string_t *dest, enum mail_flags flags,
+		      const char *const *keywords) ATTR_NULL(3);
+/* Parse system flag from a string, or return 0 if it's invalid. */
+enum mail_flags imap_parse_system_flag(const char *str);
+
+/* Write sequence range as IMAP sequence-set */
+void imap_write_seq_range(string_t *dest, const ARRAY_TYPE(seq_range) *array);
+/* Write IMAP arg to the given string. Because IMAP_ARG_LITERAL_SIZE* have no
+   content, they're written as "{size}\r\n<too large>". */
+void imap_write_arg(string_t *dest, const struct imap_arg *arg);
+/* Same as imap_write_arg(), but write all the args until EOL. */
+void imap_write_args(string_t *dest, const struct imap_arg *args);
+/* Write IMAP args in a human-readable format to given string (e.g. for
+   logging). The output is a single valid UTF-8 line without control
+   characters. Multi-line literals are replaced with a generic placeholder. */
+void imap_write_args_for_human(string_t *dest, const struct imap_arg *args);
+/* Like imap_write_args(), but return the string allocated from data stack. */
+const char *imap_args_to_str(const struct imap_arg *args);
+
+#endif
diff --git a/src/lib-imap/test-imap-bodystructure.c b/src/lib-imap/test-imap-bodystructure.c
new file mode 100644
index 0000000..6035118
--- /dev/null
+++ b/src/lib-imap/test-imap-bodystructure.c
@@ -0,0 +1,733 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "istream.h"
+#include "str.h"
+#include "message-part-data.h"
+#include "message-part-serialize.h"
+#include "message-parser.h"
+#include "imap-bodystructure.h"
+#include "test-common.h"
+
+struct parse_test {
+	const char *message;
+	const char *body;
+	const char *bodystructure;
+};
+
+struct parse_test parse_tests[] = {
+	{
+		.message =
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2017 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: text/plain; charset=us-ascii\n"
+			"\n"
+			"body\n",
+		.bodystructure =
+			"\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 6 1 NIL NIL NIL NIL",
+		.body =
+			"\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 6 1"
+	},{
+		.message =
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2017 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: text/plain; charset=utf-8\n"
+			"Content-Transfer-Encoding: 8bit\n"
+			"\n"
+			"body\n"
+			"\n",
+		.bodystructure =
+			"\"text\" \"plain\" (\"charset\" \"utf-8\") NIL NIL \"8bit\" 8 2 NIL NIL NIL NIL",
+		.body =
+			"\"text\" \"plain\" (\"charset\" \"utf-8\") NIL NIL \"8bit\" 8 2"
+	},{
+		.message =
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2007 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: multipart/mixed; boundary=\"foo\n"
+			" bar\"\n"
+			"\n"
+			"--foo bar\n"
+			"Content-Type: text/x-myown; charset=us-ascii\n"
+			"\n"
+			"hello\n"
+			"\n"
+			"--foo bar--\n"
+			"\n",
+		.bodystructure =
+			"(\"text\" \"x-myown\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 7 1 NIL NIL NIL NIL) \"mixed\" (\"boundary\" \"foo bar\") NIL NIL NIL",
+		.body =
+			"(\"text\" \"x-myown\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 7 1) \"mixed\""
+	},{
+		.message =
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2017 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: multipart/mixed; boundary=\"foo bar\"\n"
+			"\n"
+			"--foo bar\n"
+			"Content-Type: text/plain; charset=us-ascii\n"
+			"\n"
+			"See attached...\n"
+			"\n"
+			"--foo bar\n"
+			"Content-Type: message/rfc822\n"
+			"\n"
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2017 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: text/plain; charset=us-ascii\n"
+			"\n"
+			"body\n"
+			"\n"
+			"--foo bar--\n"
+			"\n",
+		.bodystructure =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 17 1 NIL NIL NIL NIL)(\"message\" \"rfc822\" NIL NIL NIL \"7bit\" 133 (\"Sat, 24 Mar 2017 23:00:00 +0200\" NIL ((NIL NIL \"user\" \"domain.org\")) ((NIL NIL \"user\" \"domain.org\")) ((NIL NIL \"user\" \"domain.org\")) NIL NIL NIL NIL NIL) (\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 6 1 NIL NIL NIL NIL) 6 NIL NIL NIL NIL) \"mixed\" (\"boundary\" \"foo bar\") NIL NIL NIL",
+		.body =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 17 1)(\"message\" \"rfc822\" NIL NIL NIL \"7bit\" 133 (\"Sat, 24 Mar 2017 23:00:00 +0200\" NIL ((NIL NIL \"user\" \"domain.org\")) ((NIL NIL \"user\" \"domain.org\")) ((NIL NIL \"user\" \"domain.org\")) NIL NIL NIL NIL NIL) (\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 6 1) 6) \"mixed\""
+	},{
+		.message =
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2017 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: multipart/mixed; boundary=\"foo bar\"\n"
+			"\n"
+			"--foo bar\n"
+			"Content-Type: text/plain; charset=us-ascii\n"
+			"Content-ID: <A.frop.example.com>\n"
+			"Content-Description: Container message\n"
+			"\n"
+			"See attached...\n"
+			"\n"
+			"--foo bar\n"
+			"Content-Type: message/rfc822\n"
+			"Content-ID: <B.frop.example.com>\n"
+			"Content-Description: Forwarded\n"
+			"\n"
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2017 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: text/plain; charset=us-ascii\n"
+			"\n"
+			"body\n"
+			"\n"
+			"--foo bar--\n",
+		.bodystructure =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\") \"<A.frop.example.com>\" \"Container message\" \"7bit\" 17 1 NIL NIL NIL NIL)(\"message\" \"rfc822\" NIL \"<B.frop.example.com>\" \"Forwarded\" \"7bit\" 133 (\"Sat, 24 Mar 2017 23:00:00 +0200\" NIL ((NIL NIL \"user\" \"domain.org\")) ((NIL NIL \"user\" \"domain.org\")) ((NIL NIL \"user\" \"domain.org\")) NIL NIL NIL NIL NIL) (\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 6 1 NIL NIL NIL NIL) 6 NIL NIL NIL NIL) \"mixed\" (\"boundary\" \"foo bar\") NIL NIL NIL",
+		.body =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\") \"<A.frop.example.com>\" \"Container message\" \"7bit\" 17 1)(\"message\" \"rfc822\" NIL \"<B.frop.example.com>\" \"Forwarded\" \"7bit\" 133 (\"Sat, 24 Mar 2017 23:00:00 +0200\" NIL ((NIL NIL \"user\" \"domain.org\")) ((NIL NIL \"user\" \"domain.org\")) ((NIL NIL \"user\" \"domain.org\")) NIL NIL NIL NIL NIL) (\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 6 1) 6) \"mixed\""
+	},{
+		.message =
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2017 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: multipart/mixed; boundary=\"foo bar\"\n"
+			"\n"
+			"--foo bar\n"
+			"Content-Type: text/plain; charset=us-ascii; format=\"flowed\";\n"
+			"  delsp=\"no\"\n"
+			"Content-Language: la\n"
+			"\n"
+			"Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo\n"
+			"ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis\n"
+			"parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec,\n"
+			"pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec\n"
+			"pede justo, fringilla vel, aliquet nec, vulputate eget, arcu. In enim justo,\n"
+			"rhoncus ut, imperdiet a, venenatis vitae, justo. Nullam dictum felis eu pede\n"
+			"mollis pretium. Integer tincidunt. Cras dapibus. Vivamus elementum semper\n"
+			"nisi. Aenean vulputate eleifend tellus. Aenean leo ligula, porttitor eu,\n"
+			"consequat vitae, eleifend ac, enim. Aliquam lorem ante, dapibus in, viverra\n"
+			"quis, feugiat a, tellus. Phasellus viverra nulla ut metus varius laoreet.\n"
+			"Quisque rutrum. Aenean imperdiet. Etiam ultricies nisi vel augue. Curabitur\n"
+			"ullamcorper ultricies nisi. Nam eget dui.\n"
+			"\n"
+			"--foo bar\n"
+			"Content-Type: image/png\n"
+			"Content-Transfer-Encoding: base64\n"
+			"Content-Disposition: attachment; filename=\"pigeon.png\"\n"
+			"\n"
+			"iVBORw0KGgoAAAANSUhEUgAAAB8AAAAfCAYAAAAfrhY5AAAABHNCSVQICAgIfAhkiAAAAAlwSFlz\n"
+			"AAAGJwAABicBTVTYxwAAABl0RVh0U29mdHdhcmUAd3d3Lmlua3NjYXBlLm9yZ5vuPBoAAAN2SURB\n"
+			"VEiJ7ZfdK7tvHMffZuWpKTlR1my3bTEPU0hJcsABh0QrKYUTJ5KyHCzlyPwBkpSyg1mUpB3ILYna\n"
+			"lEYKcbADm4cDD7NpM2bv75HF1/az8l3fX/1+77pO7vu6rtf1/jx0X3caSeIvSfK3wP/DPykcDsNs\n"
+			"NqOqqgpdXV3Y2NhIGVz6+4PJyUlcXFxAFEV4vV709fVBrVZDpVL9eTo/aGVlhXl5efT5fDw/P2c4\n"
+			"HKbdbmd3dzdTIZDk6+srh4eHqdPpqNfrSZJGo5H7+/sMBoNUKpUpgUsAQCqVQq1WIxgMfgp/dXU1\n"
+			"srKykJ+fD6/X+8ejHiu4wcFB2Gy2uJPq6uqwt7eXOjgAaLXahHCn05laeCKlyvmXVosnrVaLQCCA\n"
+			"4uJiyOVyCIIQGyqVCoIgoKCgIDXwtLQ0HBwc4O3tDR6PB263G263G8fHx1hbW4Pb7cbNzQ1yc3Nj\n"
+			"hxEEAdXV1WhoaEi88cfSf3h4iLXaR01MTFChUFChULCjo4M7OztxW8fn89HlcnF5eZlTU1Nsb29n\n"
+			"W1sb/X5/3PlJwd/19vbG7e1tlpWVcXV19ftGJjk0NESbzRb33aeCy8zMhM/nSxgliUSCxsZGiKKI\n"
+			"ra2tb9N1e3uLSCSC8fFxGAwGDAwMfC7c309TWFjI09PTpFwlis76+jo7OzspCAJNJhN3d3fpcDho\n"
+			"tVqpUCgYCoVIkl8Krr6+Hna7HSUlJd86+yiPx4P5+XlYLBZUVFSgv78fVqsV6enpAIC7uzt4vV5E\n"
+			"IhFIJJL4zp1OJ2traxmJRL51+fLywuXlZba2trK0tJRms5mXl5c8PT3l4uIix8bG2NbWRqVSyfLy\n"
+			"cvb09PDw8DC2Po38eocbGRlBIBDA9PQ0pNKv3Xh2doa5uTksLCwgJycHNTU1yM3NxdHREa6vr6HR\n"
+			"aKDX62NDp9MhIyPjyz5x4SQxOjoKURTR29sLmUyG7Oxs+P1+WCwW7O7uQiKRQKvVQq/Xo7KyMgaS\n"
+			"y+VJpyou/F0nJydYWlqCy+XC1dUV7u/vYTQa8fT0BIfDgaWlpaRBcZVsFc/OznJsbIwkaTKZODMz\n"
+			"k+zShEr6Arm5uYnm5mYAgCiKaGlp+ZnrZJ1Ho1EWFRXx+fmZj4+P1Gg0P3ZNJqj2dxkMhth3PBAI\n"
+			"QCaTIRqNIhQKoamp6cc5/0d4qvXv+mn4z8B/AV1UVu6zi+zUAAAAAElFTkSuQmCC\n"
+			"--foo bar--\n",
+		.bodystructure =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\" \"format\" \"flowed\" \"delsp\" \"no\") NIL NIL \"7bit\" 881 12 NIL NIL (\"la\") NIL)(\"image\" \"png\" NIL NIL NIL \"base64\" 1390 NIL (\"attachment\" (\"filename\" \"pigeon.png\")) NIL NIL) \"mixed\" (\"boundary\" \"foo bar\") NIL NIL NIL",
+		.body =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\" \"format\" \"flowed\" \"delsp\" \"no\") NIL NIL \"7bit\" 881 12)(\"image\" \"png\" NIL NIL NIL \"base64\" 1390) \"mixed\""
+	},{
+		.message =
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2007 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: multipart/mixed; boundary=\"foo\n"
+			" bar\"\n"
+			"\n"
+			"Root MIME prologue\n"
+			"\n"
+			"--foo bar\n"
+			"Content-Type: text/x-myown; charset=us-ascii; foo=\"quoted\\\"string\"\n"
+			"Content-ID: <foo@example.com>\n"
+			"Content-MD5: Q2hlY2sgSW50ZWdyaXR5IQ==\n"
+			"Content-Disposition: inline; foo=bar\n"
+			"Content-Description: hellodescription\n"
+			"Content-Language: en, fi, se\n"
+			"Content-Location: http://example.com/test.txt\n"
+			"\n"
+			"hello\n"
+			"\n"
+			"--foo bar\n"
+			"Content-Type: message/rfc822\n"
+			"\n"
+			"From: sub@domain.org\n"
+			"To: sub-to1@domain.org, sub-to2@domain.org\n"
+			"Date: Sun, 12 Aug 2012 12:34:56 +0300\n"
+			"Subject: submsg\n"
+			"Content-Type: multipart/alternative; boundary=\"sub1\"\n"
+			"\n"
+			"Sub MIME prologue\n"
+			"--sub1\n"
+			"Content-Type: text/html\n"
+			"Content-Transfer-Encoding: 8bit\n"
+			"\n"
+			"<p>Hello world</p>\n"
+			"\n"
+			"--sub1\n"
+			"Content-Type: text/plain\n"
+			"Content-Transfer-Encoding: ?invalid\n"
+			"\n"
+			"Hello another world\n"
+			"\n"
+			"--sub1--\n"
+			"Sub MIME epilogue\n"
+			"\n"
+			"--foo bar--\n"
+			"Root MIME epilogue\n",
+		.bodystructure =
+			"(\"text\" \"x-myown\" (\"charset\" \"us-ascii\" \"foo\" \"quoted\\\"string\") \"<foo@example.com>\" \"hellodescription\" \"7bit\" 7 1 \"Q2hlY2sgSW50ZWdyaXR5IQ==\" (\"inline\" (\"foo\" \"bar\")) (\"en\" \"fi\" \"se\") \"http://example.com/test.txt\")(\"message\" \"rfc822\" NIL NIL NIL \"7bit\" 412 (\"Sun, 12 Aug 2012 12:34:56 +0300\" \"submsg\" ((NIL NIL \"sub\" \"domain.org\")) ((NIL NIL \"sub\" \"domain.org\")) ((NIL NIL \"sub\" \"domain.org\")) ((NIL NIL \"sub-to1\" \"domain.org\")(NIL NIL \"sub-to2\" \"domain.org\")) NIL NIL NIL NIL) ((\"text\" \"html\" (\"charset\" \"us-ascii\") NIL NIL \"8bit\" 20 1 NIL NIL NIL NIL)(\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 21 1 NIL NIL NIL NIL) \"alternative\" (\"boundary\" \"sub1\") NIL NIL NIL) 21 NIL NIL NIL NIL) \"mixed\" (\"boundary\" \"foo bar\") NIL NIL NIL",
+		.body =
+			"(\"text\" \"x-myown\" (\"charset\" \"us-ascii\" \"foo\" \"quoted\\\"string\") \"<foo@example.com>\" \"hellodescription\" \"7bit\" 7 1)(\"message\" \"rfc822\" NIL NIL NIL \"7bit\" 412 (\"Sun, 12 Aug 2012 12:34:56 +0300\" \"submsg\" ((NIL NIL \"sub\" \"domain.org\")) ((NIL NIL \"sub\" \"domain.org\")) ((NIL NIL \"sub\" \"domain.org\")) ((NIL NIL \"sub-to1\" \"domain.org\")(NIL NIL \"sub-to2\" \"domain.org\")) NIL NIL NIL NIL) ((\"text\" \"html\" (\"charset\" \"us-ascii\") NIL NIL \"8bit\" 20 1)(\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 21 1) \"alternative\") 21) \"mixed\""
+	},{
+		.message =
+			"Content-Type: multipart/mixed; boundary=\"foo\"\n"
+			"\n",
+		.bodystructure =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL NIL NIL NIL) \"mixed\" (\"boundary\" \"foo\") NIL NIL NIL",
+		.body =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0) \"mixed\""
+
+	}
+};
+
+static const unsigned int parse_tests_count = N_ELEMENTS(parse_tests);
+
+struct normalize_test {
+	const char *message;
+	const char *input;
+	const char *output;
+};
+
+struct normalize_test normalize_tests[] = {
+	{
+		.message =
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2017 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: text/plain; charset=us-ascii\n"
+			"\n"
+			"body\n",
+		.input =
+			"\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 6 1",
+		.output =
+			"\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 6 1 NIL NIL NIL NIL",
+	}, {
+		.message =
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2017 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: text/plain; charset=us-ascii\n"
+			"Content-MD5: ae6ba5b4c6eb1efd4a9fac3708046cbe\n"
+			"\n"
+			"body\n",
+		.input =
+			"\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 6 1 \"ae6ba5b4c6eb1efd4a9fac3708046cbe\"",
+		.output =
+			"\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 6 1 \"ae6ba5b4c6eb1efd4a9fac3708046cbe\" NIL NIL NIL",
+	}, {
+		.message =
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2017 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: multipart/mixed; boundary=\"foo bar\"\n"
+			"\n"
+			"--foo bar\n"
+			"Content-Type: text/plain; charset=us-ascii\n"
+			"\n"
+			"See attached...\n"
+			"\n"
+			"--foo bar\n"
+			"Content-Type: message/rfc822\n"
+			"\n"
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2017 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: text/plain; charset=us-ascii\n"
+			"\n"
+			"body\n"
+			"\n"
+			"--foo bar--\n"
+			"\n",
+		.input =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 17 1)(\"message\" \"rfc822\" NIL NIL NIL \"7bit\" 133 (\"Sat, 24 Mar 2017 23:00:00 +0200\" NIL ((NIL NIL \"user\" \"domain.org\")) ((NIL NIL \"user\" \"domain.org\")) ((NIL NIL \"user\" \"domain.org\")) NIL NIL NIL NIL NIL) (\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 6 1) 6) \"mixed\"",
+		.output =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 17 1 NIL NIL NIL NIL)(\"message\" \"rfc822\" NIL NIL NIL \"7bit\" 133 (\"Sat, 24 Mar 2017 23:00:00 +0200\" NIL ((NIL NIL \"user\" \"domain.org\")) ((NIL NIL \"user\" \"domain.org\")) ((NIL NIL \"user\" \"domain.org\")) NIL NIL NIL NIL NIL) (\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 6 1 NIL NIL NIL NIL) 6 NIL NIL NIL NIL) \"mixed\" NIL NIL NIL NIL"
+	}, {
+		.message =
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2017 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: multipart/mixed; boundary=\"foo bar\"\n"
+			"\n"
+			"--foo bar\n"
+			"Content-Type: text/plain; charset=us-ascii\n"
+			"\n"
+			"See attached...\n"
+			"\n"
+			"--foo bar--\n"
+			"\n",
+		.input =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 17 1) \"mixed\" (\"boundary\" \"foo bar\")",
+		.output =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 17 1 NIL NIL NIL NIL) \"mixed\" (\"boundary\" \"foo bar\") NIL NIL NIL"
+	}, {
+		.message =
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2017 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: multipart/mixed; boundary=\"foo bar\"\n"
+			"\n"
+			"--foo bar\n"
+			"Content-Type: text/plain; charset=us-ascii\n"
+			"Content-MD5: 6537bae18ed07779c9dc25f24635b0f3\n"
+			"\n"
+			"See attached...\n"
+			"\n"
+			"--foo bar--\n"
+			"\n",
+		.input =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 17 1 \"6537bae18ed07779c9dc25f24635b0f3\") \"mixed\" (\"boundary\" \"foo bar\")",
+		.output =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 17 1 \"6537bae18ed07779c9dc25f24635b0f3\" NIL NIL NIL) \"mixed\" (\"boundary\" \"foo bar\") NIL NIL NIL"
+	}, {
+		.message =
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2017 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: multipart/mixed; boundary=\"foo bar\"\n"
+			"\n"
+			"--foo bar\n"
+			"Content-Type: text/plain; charset=us-ascii\n"
+			"Content-Language: en\n"
+			"\n"
+			"See attached...\n"
+			"\n"
+			"--foo bar--\n"
+			"\n",
+		.input =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 17 1 NIL NIL \"en\") \"mixed\" (\"boundary\" \"foo bar\")",
+		.output =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 17 1 NIL NIL (\"en\") NIL) \"mixed\" (\"boundary\" \"foo bar\") NIL NIL NIL"
+	}, {
+		.message =
+			"From: user@domain.org\n"
+			"Date: Sat, 24 Mar 2017 23:00:00 +0200\n"
+			"Mime-Version: 1.0\n"
+			"Content-Type: multipart/mixed; boundary=\"foo bar\"\n"
+			"\n"
+			"--foo bar\n"
+			"Content-Type: text/plain; charset=us-ascii\n"
+			"Content-Location: http://www.example.com/frop.txt\n"
+			"\n"
+			"See attached...\n"
+			"\n"
+			"--foo bar--\n"
+			"\n",
+		.input =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 17 1 NIL NIL NIL \"http://www.example.com/frop.txt\") \"mixed\" (\"boundary\" \"foo bar\")",
+		.output =
+			"(\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 17 1 NIL NIL NIL \"http://www.example.com/frop.txt\") \"mixed\" (\"boundary\" \"foo bar\") NIL NIL NIL"
+	}
+};
+
+static const unsigned int normalize_tests_count = N_ELEMENTS(normalize_tests);
+
+static struct message_part *
+msg_parse(pool_t pool, const char *message, unsigned int max_nested_mime_parts,
+	  unsigned int max_total_mime_parts, bool parse_bodystructure)
+{
+	const struct message_parser_settings parser_set = {
+		.hdr_flags = MESSAGE_HEADER_PARSER_FLAG_SKIP_INITIAL_LWSP |
+			MESSAGE_HEADER_PARSER_FLAG_DROP_CR,
+		.flags = MESSAGE_PARSER_FLAG_SKIP_BODY_BLOCK,
+		.max_nested_mime_parts = max_nested_mime_parts,
+		.max_total_mime_parts = max_total_mime_parts,
+	};
+	struct message_parser_ctx *parser;
+	struct istream *input;
+	struct message_block block;
+	struct message_part *parts;
+	int ret;
+
+	input = i_stream_create_from_data(message, strlen(message));
+	parser = message_parser_init(pool, input, &parser_set);
+	while ((ret = message_parser_parse_next_block(parser, &block)) > 0) {
+		if (parse_bodystructure) {
+			message_part_data_parse_from_header(pool, block.part,
+							block.hdr);
+		}
+	}
+	test_assert(ret < 0);
+
+	message_parser_deinit(&parser, &parts);
+	i_stream_unref(&input);
+	return parts;
+}
+
+static void test_imap_bodystructure_write(void)
+{
+	struct message_part *parts;
+	const char *error;
+	unsigned int i;
+
+	for (i = 0; i < parse_tests_count; i++) T_BEGIN {
+		struct parse_test *test = &parse_tests[i];
+		string_t *str = t_str_new(128);
+		pool_t pool = pool_alloconly_create("imap bodystructure write", 1024);
+
+		test_begin(t_strdup_printf("imap bodystructure write [%u]", i));
+		parts = msg_parse(pool, test->message, 0, 0, TRUE);
+
+		test_assert(imap_bodystructure_write(parts, str, TRUE, &error) == 0);
+		test_assert(strcmp(str_c(str), test->bodystructure) == 0);
+
+		str_truncate(str, 0);
+		test_assert(imap_bodystructure_write(parts, str, FALSE, &error) == 0);
+		test_assert(strcmp(str_c(str), test->body) == 0);
+
+		pool_unref(&pool);
+		test_end();
+	} T_END;
+
+	T_BEGIN {
+		test_begin("imap bodystructure write - corrupted");
+		pool_t pool = pool_alloconly_create("imap bodystructure write", 1024);
+
+		parts = msg_parse(pool, "Subject: hello world", 0, 0, TRUE);
+		i_assert((parts->flags & MESSAGE_PART_FLAG_TEXT) != 0);
+		parts->flags &= ENUM_NEGATE(MESSAGE_PART_FLAG_TEXT);
+
+		string_t *str = t_str_new(128);
+		test_assert(imap_bodystructure_write(parts, str, FALSE, &error) < 0);
+		test_assert_strcmp(error, "text flag mismatch");
+		pool_unref(&pool);
+		test_end();
+	} T_END;
+}
+
+static void test_imap_bodystructure_parse(void)
+{
+	struct message_part *parts;
+	const char *error;
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < parse_tests_count; i++) T_BEGIN {
+		struct parse_test *test = &parse_tests[i];
+		string_t *str = t_str_new(128);
+		pool_t pool = pool_alloconly_create("imap bodystructure parse", 1024);
+
+		test_begin(t_strdup_printf("imap bodystructure parser [%u]", i));
+		parts = msg_parse(pool, test->message, 0, 0, FALSE);
+
+		test_assert(imap_body_parse_from_bodystructure(test->bodystructure,
+								     str, &error) == 0);
+		test_assert(strcmp(str_c(str), test->body) == 0);
+
+		ret = imap_bodystructure_parse(test->bodystructure,
+							   pool, parts, &error);
+		test_assert(ret == 0);
+
+		if (ret == 0) {
+			str_truncate(str, 0);
+			test_assert(imap_bodystructure_write(parts, str, TRUE, &error) == 0);
+			test_assert(strcmp(str_c(str), test->bodystructure) == 0);
+		} else {
+			i_error("Invalid BODYSTRUCTURE: %s", error);
+		}
+
+		pool_unref(&pool);
+		test_end();
+	} T_END;
+}
+
+static void test_imap_bodystructure_parse_invalid(void)
+{
+	static const struct parse_test_invalid {
+		const char *message;
+		const char *bodystructure;
+		const char *error;
+	} invalid_bodystructure_tests[] = {
+		/* Make sure NILs aren't allowed where strings are expected */
+		{ "foo", "NIL \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL NIL NIL NIL", "Invalid content-type" },
+		{ "foo", "\"text\" NIL (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL NIL NIL NIL", "Invalid content-type" },
+		{ "foo", "\"text\" \"plain\" (NIL \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL NIL NIL NIL", "Invalid content params" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" NIL) NIL NIL \"7bit\" 0 0 NIL NIL NIL NIL", "Invalid content params" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL NIL 0 0 NIL NIL NIL NIL", "Invalid content-transfer-encoding" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" NIL 0 NIL NIL NIL NIL", "Invalid size field" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 NIL NIL NIL NIL NIL", "Invalid lines field" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL (NIL (\"foo\" \"bar\")) NIL NIL", "Invalid content-disposition" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL (\"inline\" (NIL \"bar\")) NIL NIL", "Invalid content-disposition params" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL (\"inline\" (\"foo\" NIL)) NIL NIL", "Invalid content-disposition params" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL NIL (NIL \"bar\") NIL", "Invalid content-language" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL NIL (\"foo\" NIL) NIL", "Invalid content-language" },
+
+		/* Make sure atoms aren't allowed anywhere */
+		{ "foo", "ATOM \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL NIL NIL NIL", "Invalid content-type" },
+		{ "foo", "\"text\" ATOM (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL NIL NIL NIL", "Invalid content-type" },
+		{ "foo", "\"text\" \"plain\" (ATOM \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL NIL NIL NIL", "Invalid content params" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" ATOM) NIL NIL \"7bit\" 0 0 NIL NIL NIL NIL", "Invalid content params" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") ATOM NIL \"7bit\" 0 0 NIL NIL NIL NIL", "Invalid content-id" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL ATOM \"7bit\" 0 0 NIL NIL NIL NIL", "Invalid content-description" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL ATOM 0 0 NIL NIL NIL NIL", "Invalid content-transfer-encoding" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" ATOM 0 NIL NIL NIL NIL", "Invalid size field" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 ATOM NIL NIL NIL NIL", "Invalid lines field" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 ATOM NIL NIL NIL", "Invalid content-md5" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL ATOM NIL NIL", "Invalid content-disposition list" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL (ATOM (\"foo\" \"bar\")) NIL NIL", "Invalid content-disposition" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL (\"inline\" (ATOM \"bar\")) NIL NIL", "Invalid content-disposition params" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL (\"inline\" (\"foo\" ATOM)) NIL NIL", "Invalid content-disposition params" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL NIL ATOM NIL", "Invalid content-language" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL NIL (ATOM \"bar\") NIL", "Invalid content-language" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL NIL (\"foo\" ATOM) NIL", "Invalid content-language" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL NIL NIL ATOM", "Invalid content-location" },
+
+		/* Make sure empty lists aren't allowed anywhere */
+		{ "foo", "\"text\" \"plain\" () NIL NIL \"7bit\" 0 0 NIL NIL NIL NIL", "Invalid content params" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") () NIL \"7bit\" 0 0 NIL NIL NIL NIL", "Invalid content-id" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL () \"7bit\" 0 0 NIL NIL NIL NIL", "Invalid content-description" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL () 0 0 NIL NIL NIL NIL", "Invalid content-transfer-encoding" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" () 0 NIL NIL NIL NIL", "Invalid size field" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 () NIL NIL NIL NIL", "Invalid lines field" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 () NIL NIL NIL", "Invalid content-md5" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL () NIL NIL", "Invalid content-disposition" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL NIL () NIL", "Invalid content-language" },
+		{ "foo", "\"text\" \"plain\" (\"charset\" \"us-ascii\") NIL NIL \"7bit\" 0 0 NIL NIL NIL ()", "Invalid content-location" },
+	};
+	struct message_part *parts;
+	const char *error;
+	unsigned int i;
+
+	test_begin("imap bodystructure parser invalid");
+	for (i = 0; i < N_ELEMENTS(invalid_bodystructure_tests); i++) T_BEGIN {
+		const struct parse_test_invalid *test =
+			&invalid_bodystructure_tests[i];
+		pool_t pool = pool_alloconly_create("imap bodystructure parse", 1024);
+
+		parts = msg_parse(pool, test->message, 0, 0, FALSE);
+		test_assert_idx(imap_bodystructure_parse(test->bodystructure,
+							 pool, parts, &error) == -1, i);
+		test_assert_strcmp_idx(error, test->error, i);
+		pool_unref(&pool);
+	} T_END;
+	test_end();
+}
+
+static void test_imap_bodystructure_parse_full(void)
+{
+	const char *error;
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < parse_tests_count; i++) T_BEGIN {
+		struct parse_test *test = &parse_tests[i];
+		struct message_part *parts = NULL;
+		string_t *str = t_str_new(128);
+		pool_t pool = pool_alloconly_create("imap bodystructure parse full", 1024);
+
+		test_begin(t_strdup_printf("imap bodystructure parser full [%u]", i));
+
+		ret = imap_bodystructure_parse_full(test->bodystructure,
+							   pool, &parts, &error);
+		test_assert(ret == 0);
+
+		if (ret == 0) {
+			str_truncate(str, 0);
+			test_assert(imap_bodystructure_write(parts, str, TRUE, &error) == 0);
+			test_assert(strcmp(str_c(str), test->bodystructure) == 0);
+		} else {
+			i_error("Invalid BODYSTRUCTURE: %s", error);
+		}
+
+		pool_unref(&pool);
+		test_end();
+	} T_END;
+}
+
+static void test_imap_bodystructure_normalize(void)
+{
+	struct message_part *parts;
+	const char *error;
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < normalize_tests_count; i++) T_BEGIN {
+		struct normalize_test *test = &normalize_tests[i];
+		string_t *str = t_str_new(128);
+		pool_t pool = pool_alloconly_create("imap bodystructure parse", 1024);
+
+		test_begin(t_strdup_printf("imap bodystructure normalize [%u]", i));
+		parts = msg_parse(pool, test->message, 0, 0, FALSE);
+
+		ret = imap_bodystructure_parse(test->input,
+							   pool, parts, &error);
+		test_assert(ret == 0);
+
+		if (ret == 0) {
+			str_truncate(str, 0);
+			test_assert(imap_bodystructure_write(parts, str, TRUE, &error) == 0);
+			test_assert(strcmp(str_c(str), test->output) == 0);
+		} else {
+			i_error("Invalid BODYSTRUCTURE: %s", error);
+		}
+
+		pool_unref(&pool);
+		test_end();
+	} T_END;
+}
+
+static const struct {
+	const char *input;
+	const char *bodystructure;
+	unsigned int max_depth;
+	unsigned int max_total;
+} truncation_tests[] = {
+	{
+		.input = "Content-Type: message/rfc822\n"
+			"\n"
+			"Content-Type: message/rfc822\n"
+			"Header2: value2\n"
+			"\n"
+			"Subject: hello world\n"
+			"Header2: value2\n"
+			"Header3: value3\n"
+			"\n"
+			"body line 1\n"
+			"body line 2\n"
+			"body line 4\n"
+			"body line 3\n",
+		.bodystructure = "\"message\" \"rfc822\" NIL NIL NIL \"7bit\" 159 (NIL NIL NIL NIL NIL NIL NIL NIL NIL NIL) (\"application\" \"octet-stream\" NIL NIL NIL \"7bit\" 110 NIL NIL NIL NIL) 11 NIL NIL NIL NIL",
+		.max_depth = 2,
+	},
+	{
+		.input = "Content-Type: multipart/mixed; boundary=1\n"
+			"\n"
+			"--1\n"
+			"Content-Type: multipart/mixed; boundary=2\n"
+			"\n"
+			"--2\n"
+			"Content-Type: multipart/mixed; boundary=3\n"
+			"\n"
+			"--3\n"
+			"\n"
+			"body\n",
+		.bodystructure = "(\"application\" \"octet-stream\" (\"boundary\" \"2\") NIL NIL \"7bit\" 63 NIL NIL NIL NIL) \"mixed\" (\"boundary\" \"1\") NIL NIL NIL",
+		.max_depth = 2,
+	},
+	{
+		.input = "Content-Type: multipart/digest; boundary=1\n"
+			"\n"
+			"--1\n"
+			"\n"
+			"Subject: hdr1\n"
+			"\n"
+			"body1\n"
+			"--1\n"
+			"\n"
+			"Subject: hdr2\n"
+			"\n"
+			"body2\n",
+		.bodystructure = "(\"application\" \"octet-stream\" NIL NIL NIL \"7bit\" 55 NIL NIL NIL NIL) \"digest\" (\"boundary\" \"1\") NIL NIL NIL",
+		.max_total = 2,
+	},
+
+};
+
+static void test_imap_bodystructure_truncation(void)
+{
+	struct message_part *parts;
+	const char *error;
+	string_t *str_body = t_str_new(128);
+	string_t *str_parts = t_str_new(128);
+	pool_t pool = pool_alloconly_create("imap bodystructure parse", 1024);
+
+	test_begin("imap bodystructure truncation");
+
+	for (unsigned int i = 0; i < N_ELEMENTS(truncation_tests); i++) {
+		p_clear(pool);
+		str_truncate(str_body, 0);
+		str_truncate(str_parts, 0);
+
+		parts = msg_parse(pool, truncation_tests[i].input,
+				  truncation_tests[i].max_depth,
+				  truncation_tests[i].max_total,
+				  TRUE);
+
+		/* write out BODYSTRUCTURE and serialize message_parts */
+		test_assert(imap_bodystructure_write(parts, str_body, TRUE, &error) == 0);
+		message_part_serialize(parts, str_parts);
+
+		/* now deserialize message_parts and make sure they can be used
+		   to parse BODYSTRUCTURE */
+		parts = message_part_deserialize(pool, str_data(str_parts),
+						 str_len(str_parts), &error);
+		test_assert(parts != NULL);
+		test_assert(imap_bodystructure_parse(str_c(str_body), pool,
+						     parts, &error) == 0);
+		test_assert_strcmp(str_c(str_body),
+				   truncation_tests[i].bodystructure);
+	}
+	pool_unref(&pool);
+	test_end();
+}
+
+int main(void)
+{
+	static void (*const test_functions[])(void) = {
+		test_imap_bodystructure_write,
+		test_imap_bodystructure_parse,
+		test_imap_bodystructure_parse_invalid,
+		test_imap_bodystructure_normalize,
+		test_imap_bodystructure_parse_full,
+		test_imap_bodystructure_truncation,
+		NULL
+	};
+	return test_run(test_functions);
+}
diff --git a/src/lib-imap/test-imap-envelope.c b/src/lib-imap/test-imap-envelope.c
new file mode 100644
index 0000000..1f295e5
--- /dev/null
+++ b/src/lib-imap/test-imap-envelope.c
@@ -0,0 +1,205 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "istream.h"
+#include "str.h"
+#include "message-part-data.h"
+#include "message-parser.h"
+#include "imap-envelope.h"
+#include "test-common.h"
+
+struct parse_test {
+	const char *message;
+	const char *envelope;
+};
+
+struct parse_test parse_tests[] = {
+	/* Tests copied from imaptest */
+	{
+		.message =
+			"Message-ID: <msg@id>\n"
+			"In-Reply-To: <reply@to.id>\n"
+			"Date: Thu, 15 Feb 2007 01:02:03 +0200\n"
+			"Subject: subject header\n"
+			"From: From Real <fromuser@fromdomain.org>\n"
+			"To: To Real <touser@todomain.org>\n"
+			"Cc: Cc Real <ccuser@ccdomain.org>\n"
+			"Bcc: Bcc Real <bccuser@bccdomain.org>\n"
+			"Sender: Sender Real <senderuser@senderdomain.org>\n"
+			"Reply-To: ReplyTo Real <replytouser@replytodomain.org>\n"
+			"\n"
+			"body\n",
+		.envelope =
+			"\"Thu, 15 Feb 2007 01:02:03 +0200\" "
+				"\"subject header\" "
+				"((\"From Real\" NIL \"fromuser\" \"fromdomain.org\")) "
+				"((\"Sender Real\" NIL \"senderuser\" \"senderdomain.org\")) "
+				"((\"ReplyTo Real\" NIL \"replytouser\" \"replytodomain.org\")) "
+				"((\"To Real\" NIL \"touser\" \"todomain.org\")) "
+				"((\"Cc Real\" NIL \"ccuser\" \"ccdomain.org\")) "
+				"((\"Bcc Real\" NIL \"bccuser\" \"bccdomain.org\")) "
+				"\"<reply@to.id>\" \"<msg@id>\""
+	}, {
+		.message =
+			"Date: Thu, 15 Feb 2007 01:02:03 +0200\n"
+			"From: user@domain\n"
+			"\n"
+			"body\n",
+		.envelope =
+			"\"Thu, 15 Feb 2007 01:02:03 +0200\" NIL "
+				"((NIL NIL \"user\" \"domain\")) "
+				"((NIL NIL \"user\" \"domain\")) "
+				"((NIL NIL \"user\" \"domain\")) NIL NIL NIL NIL NIL"
+	}, {
+		.message =
+			"Date: Thu, 15 Feb 2007 01:02:03 +0200\n"
+			"From: user@domain\n"
+			"\n"
+			"body\n",
+		.envelope =
+			"\"Thu, 15 Feb 2007 01:02:03 +0200\" NIL "
+				"((NIL NIL \"user\" \"domain\")) "
+				"((NIL NIL \"user\" \"domain\")) "
+				"((NIL NIL \"user\" \"domain\")) NIL NIL NIL NIL NIL"
+	}, {
+		.message =
+			"Date: Thu, 15 Feb 2007 01:02:03 +0200\n"
+			"From: user@domain (Real Name)\n"
+			"To: group: g1@d1.org, g2@d2.org;, group2: g3@d3.org;\n"
+			"Cc: group:;, group2: (foo) ;\n"
+			"\n"
+			"body\n",
+		.envelope =
+			"\"Thu, 15 Feb 2007 01:02:03 +0200\" NIL "
+				"((\"Real Name\" NIL \"user\" \"domain\")) "
+				"((\"Real Name\" NIL \"user\" \"domain\")) "
+				"((\"Real Name\" NIL \"user\" \"domain\")) "
+				"((NIL NIL \"group\" NIL)"
+						"(NIL NIL \"g1\" \"d1.org\")"
+						"(NIL NIL \"g2\" \"d2.org\")"
+						"(NIL NIL NIL NIL)"
+					"(NIL NIL \"group2\" NIL)"
+						"(NIL NIL \"g3\" \"d3.org\")"
+						"(NIL NIL NIL NIL)) "
+				"((NIL NIL \"group\" NIL)(NIL NIL NIL NIL)"
+					"(NIL NIL \"group2\" NIL)(NIL NIL NIL NIL)) "
+				"NIL NIL NIL"
+	}, {
+		.message =
+			"Date: Thu, 15 Feb 2007 01:02:03 +0200\n"
+			"From: user@domain (Real Name)\n"
+			"Sender: \n"
+			"Reply-To: \n"
+			"\n"
+			"body\n",
+		.envelope =
+			"\"Thu, 15 Feb 2007 01:02:03 +0200\" NIL "
+				"((\"Real Name\" NIL \"user\" \"domain\")) "
+				"((\"Real Name\" NIL \"user\" \"domain\")) "
+				"((\"Real Name\" NIL \"user\" \"domain\")) "
+				"NIL NIL NIL NIL NIL"
+	}, {
+		.message =
+			"Date: Thu, 15 Feb 2007 01:02:03 +0200\n"
+			"From: <@route:user@domain>\n"
+			"\n"
+			"body\n",
+		.envelope =
+			"\"Thu, 15 Feb 2007 01:02:03 +0200\" NIL "
+				"((NIL \"@route\" \"user\" \"domain\")) "
+				"((NIL \"@route\" \"user\" \"domain\")) "
+				"((NIL \"@route\" \"user\" \"domain\")) "
+				"NIL NIL NIL NIL NIL"
+	}
+};
+
+static const unsigned int parse_tests_count = N_ELEMENTS(parse_tests);
+
+static struct message_part_envelope *
+msg_parse(pool_t pool, const char *message)
+{
+	const struct message_parser_settings parser_set = {
+		.hdr_flags = MESSAGE_HEADER_PARSER_FLAG_SKIP_INITIAL_LWSP |
+			MESSAGE_HEADER_PARSER_FLAG_DROP_CR,
+		.flags = MESSAGE_PARSER_FLAG_SKIP_BODY_BLOCK,
+	};
+	struct message_parser_ctx *parser;
+	struct message_part_envelope *envlp = NULL;
+	struct istream *input;
+	struct message_block block;
+	struct message_part *parts;
+	int ret;
+
+	input = i_stream_create_from_data(message, strlen(message));
+	parser = message_parser_init(pool, input, &parser_set);
+	while ((ret = message_parser_parse_next_block(parser, &block)) > 0) {
+		i_assert(block.part->parent == NULL);
+		message_part_envelope_parse_from_header(pool, &envlp, block.hdr);
+	}
+	test_assert(ret < 0);
+
+	message_parser_deinit(&parser, &parts);
+	i_stream_unref(&input);
+	return envlp;
+}
+
+static void test_imap_envelope_write(void)
+{
+	struct message_part_envelope *envlp;
+	unsigned int i;
+
+	for (i = 0; i < parse_tests_count; i++) T_BEGIN {
+		struct parse_test *test = &parse_tests[i];
+		string_t *str = t_str_new(128);
+		pool_t pool = pool_alloconly_create("imap envelope write", 1024);
+
+		test_begin(t_strdup_printf("imap envelope write [%u]", i));
+		envlp = msg_parse(pool, test->message);
+
+		imap_envelope_write(envlp, str);
+		test_assert(strcmp(str_c(str), test->envelope) == 0);
+
+		pool_unref(&pool);
+		test_end();
+	} T_END;
+}
+
+static void test_imap_envelope_parse(void)
+{
+	struct message_part_envelope *envlp;
+	const char *error;
+	unsigned int i;
+	bool ret;
+
+	for (i = 0; i < parse_tests_count; i++) T_BEGIN {
+		struct parse_test *test = &parse_tests[i];
+		string_t *str = t_str_new(128);
+		pool_t pool = pool_alloconly_create("imap envelope parse", 1024);
+
+		test_begin(t_strdup_printf("imap envelope parser [%u]", i));
+
+		ret = imap_envelope_parse(test->envelope, pool, &envlp, &error);
+		test_assert(ret);
+
+		if (ret) {
+			str_truncate(str, 0);
+			imap_envelope_write(envlp, str);
+			test_assert(strcmp(str_c(str), test->envelope) == 0);
+		} else {
+			i_error("Invalid envelope: %s", error);
+		}
+
+		pool_unref(&pool);
+		test_end();
+	} T_END;
+}
+
+int main(void)
+{
+	static void (*const test_functions[])(void) = {
+		test_imap_envelope_write,
+		test_imap_envelope_parse,
+		NULL
+	};
+	return test_run(test_functions);
+}
diff --git a/src/lib-imap/test-imap-match.c b/src/lib-imap/test-imap-match.c
new file mode 100644
index 0000000..df911da
--- /dev/null
+++ b/src/lib-imap/test-imap-match.c
@@ -0,0 +1,127 @@
+/* Copyright (c) 2008-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "imap-match.h"
+#include "test-common.h"
+
+struct test_imap_match {
+	const char *pattern;
+	const char *input;
+	enum imap_match_result result;
+};
+
+static void test_imap_match(void)
+{
+	struct test_imap_match test[] = {
+		{ "", "", IMAP_MATCH_YES },
+		{ "a", "b", IMAP_MATCH_NO },
+		{ "foo", "foo", IMAP_MATCH_YES },
+		{ "foo", "foo/", IMAP_MATCH_PARENT },
+		{ "%", "", IMAP_MATCH_YES },
+		{ "%", "foo", IMAP_MATCH_YES },
+		{ "%", "foo/", IMAP_MATCH_PARENT },
+		{ "%/", "foo/", IMAP_MATCH_YES },
+		{ "%", "foo/bar", IMAP_MATCH_PARENT },
+		{ "%/%", "foo", IMAP_MATCH_CHILDREN },
+		{ "%/%", "foo/", IMAP_MATCH_YES },
+		{ "foo/bar/%", "foo", IMAP_MATCH_CHILDREN },
+		{ "foo/bar/%", "foo/", IMAP_MATCH_CHILDREN },
+		{ "foo*", "foo", IMAP_MATCH_YES },
+		{ "foo*", "foo/", IMAP_MATCH_YES },
+		{ "foo*", "fobo", IMAP_MATCH_NO },
+		{ "*foo*", "bar/foo/", IMAP_MATCH_YES },
+		{ "*foo*", "fobo", IMAP_MATCH_CHILDREN },
+		{ "foo*bar", "foobar/baz", IMAP_MATCH_CHILDREN | IMAP_MATCH_PARENT },
+		{ "*foo*", "fobo", IMAP_MATCH_CHILDREN },
+		{ "%/%/%", "foo/", IMAP_MATCH_CHILDREN },
+		{ "%/%o/%", "foo/", IMAP_MATCH_CHILDREN },
+		{ "%/%o/%", "foo", IMAP_MATCH_CHILDREN },
+		{ "inbox", "inbox", IMAP_MATCH_YES },
+		{ "inbox", "INBOX", IMAP_MATCH_NO }
+	};
+	struct test_imap_match inbox_test[] = {
+		{ "inbox", "inbox", IMAP_MATCH_YES },
+		{ "inbox", "iNbOx", IMAP_MATCH_YES },
+		{ "i%X", "iNbOx", IMAP_MATCH_YES },
+		{ "%I%N%B%O%X%", "inbox", IMAP_MATCH_YES },
+		{ "i%X/foo", "iNbOx/foo", IMAP_MATCH_YES },
+		{ "%I%N%B%O%X%/foo", "inbox/foo", IMAP_MATCH_YES },
+		{ "i%X/foo", "inbx/foo", IMAP_MATCH_NO }
+	};
+	struct imap_match_glob *glob, *glob2;
+	unsigned int i;
+	pool_t pool;
+
+	pool = pool_alloconly_create("imap match", 1024);
+
+	/* first try tests without inboxcasing */
+	test_begin("imap match");
+	for (i = 0; i < N_ELEMENTS(test); i++) {
+		glob = imap_match_init(pool, test[i].pattern,
+				       FALSE, '/');
+		test_assert(imap_match(glob, test[i].input) == test[i].result);
+
+		glob2 = imap_match_dup(default_pool, glob);
+		test_assert(imap_match_globs_equal(glob, glob2));
+		p_clear(pool);
+
+		/* test the dup after clearing first one's memory */
+		test_assert(imap_match(glob2, test[i].input) == test[i].result);
+		imap_match_deinit(&glob2);
+	}
+
+	/* inboxcasing tests */
+	for (i = 0; i < N_ELEMENTS(inbox_test); i++) {
+		glob = imap_match_init(pool, inbox_test[i].pattern,
+				       TRUE, '/');
+		test_assert(imap_match(glob, inbox_test[i].input) == inbox_test[i].result);
+
+		glob2 = imap_match_dup(default_pool, glob);
+		test_assert(imap_match_globs_equal(glob, glob2));
+		p_clear(pool);
+
+		/* test the dup after clearing first one's memory */
+		test_assert(imap_match(glob2, inbox_test[i].input) == inbox_test[i].result);
+		imap_match_deinit(&glob2);
+	}
+	pool_unref(&pool);
+	test_end();
+}
+
+static void test_imap_match_globs_equal(void)
+{
+	struct imap_match_glob *glob;
+	pool_t pool;
+
+	pool = pool_alloconly_create("imap match globs equal", 1024);
+	test_begin("imap match globs equal");
+
+	glob = imap_match_init(pool, "1", FALSE, '/');
+	test_assert(imap_match_globs_equal(glob,
+		imap_match_init(pool, "1", FALSE, '/')));
+	test_assert(imap_match_globs_equal(glob,
+		imap_match_init(pool, "1", TRUE, '/')));
+	test_assert(!imap_match_globs_equal(glob,
+		imap_match_init(pool, "1", FALSE, '.')));
+	test_assert(!imap_match_globs_equal(glob,
+		imap_match_init(pool, "11", FALSE, '/')));
+
+	glob = imap_match_init(pool, "in%", TRUE, '/');
+	test_assert(!imap_match_globs_equal(glob,
+		imap_match_init(pool, "in%", FALSE, '/')));
+	test_assert(!imap_match_globs_equal(glob,
+		imap_match_init(pool, "In%", TRUE, '/')));
+
+	pool_unref(&pool);
+	test_end();
+}
+
+int main(void)
+{
+	static void (*const test_functions[])(void) = {
+		test_imap_match,
+		test_imap_match_globs_equal,
+		NULL
+	};
+	return test_run(test_functions);
+}
diff --git a/src/lib-imap/test-imap-parser.c b/src/lib-imap/test-imap-parser.c
new file mode 100644
index 0000000..3ca4e34
--- /dev/null
+++ b/src/lib-imap/test-imap-parser.c
@@ -0,0 +1,157 @@
+/* Copyright (c) 2009-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "istream.h"
+#include "imap-parser.h"
+#include "test-common.h"
+
+static void test_imap_parser_crlf(void)
+{
+	static const char *test_input = "foo\r\nx\ry\n";
+	struct istream *input;
+	struct imap_parser *parser;
+	const struct imap_arg *args;
+	unsigned int i;
+	enum imap_parser_error parse_error;
+
+	test_begin("imap parser crlf handling");
+	input = test_istream_create(test_input);
+	parser = imap_parser_create(input, NULL, 1024);
+
+	/* must return -2 until LF is read */
+	for (i = 0; test_input[i] != '\n'; i++) {
+		test_istream_set_size(input, i+1);
+		(void)i_stream_read(input);
+		test_assert(imap_parser_read_args(parser, 0, 0, &args) == -2);
+	}
+	test_istream_set_size(input, i+1);
+	(void)i_stream_read(input);
+	test_assert(imap_parser_read_args(parser, 0, 0, &args) == 1);
+	test_assert(args[0].type == IMAP_ARG_ATOM);
+	test_assert(args[1].type == IMAP_ARG_EOL);
+
+	/* CR without LF should fail with error */
+	imap_parser_reset(parser);
+	i_stream_seek(input, ++i);
+	test_istream_set_size(input, ++i);
+	(void)i_stream_read(input);
+	test_assert(imap_parser_read_args(parser, 0, 0, &args) == -2);
+	test_istream_set_size(input, ++i);
+	(void)i_stream_read(input);
+	test_assert(imap_parser_read_args(parser, 0, 0, &args) == -2);
+	test_istream_set_size(input, ++i);
+	(void)i_stream_read(input);
+	test_assert(imap_parser_read_args(parser, 0, 0, &args) == -1);
+	test_assert(strcmp(imap_parser_get_error
+		(parser, &parse_error), "CR sent without LF") == 0 &&
+		parse_error == IMAP_PARSE_ERROR_BAD_SYNTAX);
+
+	imap_parser_unref(&parser);
+	i_stream_destroy(&input);
+	test_end();
+}
+
+static void test_imap_parser_partial_list(void)
+{
+	static const char *test_input = "((((foo {1000000}\r\n";
+	struct istream *input;
+	struct imap_parser *parser;
+	const struct imap_arg *args, *sub_list;
+
+	test_begin("imap parser partial list");
+	input = test_istream_create(test_input);
+	parser = imap_parser_create(input, NULL, 1024);
+
+	(void)i_stream_read(input);
+	test_assert(imap_parser_read_args(parser, 0,
+		IMAP_PARSE_FLAG_LITERAL_SIZE, &args) == 1);
+	for (unsigned int i = 0; i < 4; i++) {
+		sub_list = imap_arg_as_list(&args[0]);
+		test_assert(IMAP_ARG_IS_EOL(&args[1]));
+		args = sub_list;
+	}
+	test_assert(imap_arg_atom_equals(&args[0], "foo"));
+	test_assert(args[1].type == IMAP_ARG_LITERAL_SIZE);
+	test_assert(IMAP_ARG_IS_EOL(&args[2]));
+
+	imap_parser_unref(&parser);
+	i_stream_destroy(&input);
+	test_end();
+}
+
+static void test_imap_parser_read_tag_cmd(void)
+{
+	enum read_type {
+		BOTH,
+		TAG,
+		COMMAND
+	};
+	struct {
+		const char *input;
+		const char *tag;
+		int ret;
+		enum read_type type;
+	} tests[] = {
+		{ "tag foo", "tag", 1, BOTH },
+		{ "tag\r", "tag", 1, BOTH },
+		{ "tag\rfoo", "tag", 1, BOTH },
+		{ "tag\nfoo", "tag", 1, BOTH },
+		{ "tag\r\nfoo", "tag", 1, BOTH },
+		{ "\n", NULL, -1, BOTH },
+		{ "tag", NULL, 0, BOTH },
+		{ "tag\t", NULL, -1, BOTH },
+		{ "tag\001", NULL, -1, BOTH },
+		{ "tag\x80", NULL, -1, BOTH },
+		{ "tag(", NULL, -1, BOTH },
+		{ "tag)", NULL, -1, BOTH },
+		{ "tag{", NULL, -1, BOTH },
+		{ "tag/ ", "tag/", 1, BOTH },
+		{ "tag%", NULL, -1, BOTH },
+		{ "tag*", NULL, -1, BOTH },
+		{ "tag\"", NULL, -1, BOTH },
+		{ "tag\\", NULL, -1, BOTH },
+		{ "tag+", NULL, -1, TAG },
+		{ "tag+ ", "tag+", 1, COMMAND },
+	};
+	struct istream *input;
+	struct imap_parser *parser;
+	const char *atom;
+	int ret;
+
+	test_begin("imap_parser_read_tag and imap_parser_read_command_name");
+	for (unsigned int i = 0; i < N_ELEMENTS(tests); i++) {
+		if (tests[i].type != COMMAND) {
+			input = test_istream_create(tests[i].input);
+			test_assert(i_stream_read(input) > 0);
+			parser = imap_parser_create(input, NULL, 1024);
+			ret = imap_parser_read_tag(parser, &atom);
+			test_assert_idx(ret == tests[i].ret, i);
+			test_assert_idx(ret <= 0 || strcmp(tests[i].tag, atom) == 0, i);
+			imap_parser_unref(&parser);
+			i_stream_destroy(&input);
+		}
+
+		if (tests[i].type != TAG) {
+			input = test_istream_create(tests[i].input);
+			test_assert(i_stream_read(input) > 0);
+			parser = imap_parser_create(input, NULL, 1024);
+			ret = imap_parser_read_command_name(parser, &atom);
+			test_assert_idx(ret == tests[i].ret, i);
+			test_assert_idx(ret <= 0 || strcmp(tests[i].tag, atom) == 0, i);
+			imap_parser_unref(&parser);
+			i_stream_destroy(&input);
+		}
+	}
+	test_end();
+}
+
+int main(void)
+{
+	static void (*const test_functions[])(void) = {
+		test_imap_parser_crlf,
+		test_imap_parser_partial_list,
+		test_imap_parser_read_tag_cmd,
+		NULL
+	};
+	return test_run(test_functions);
+}
diff --git a/src/lib-imap/test-imap-quote.c b/src/lib-imap/test-imap-quote.c
new file mode 100644
index 0000000..77b46b3
--- /dev/null
+++ b/src/lib-imap/test-imap-quote.c
@@ -0,0 +1,171 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "str.h"
+#include "imap-quote.h"
+#include "test-common.h"
+
+static void test_imap_append_string_for_humans(void)
+{
+	static const struct {
+		const char *input, *output;
+	} tests[] = {
+		{ "", "\"\"" },
+		{ " ", "\"\"" },
+		{ "  ", "\"\"" },
+		{ "\t", "\"\"" },
+		{ " \t", "\"\"" },
+		{ " \t ", "\"\"" },
+		{ " foo", "{3}\r\nfoo" },
+		{ "\tfoo", "{3}\r\nfoo" },
+		{ "\t \tfoo", "{3}\r\nfoo" },
+		{ " foo ", "{3}\r\nfoo" },
+		{ " foo  ", "{3}\r\nfoo" },
+		{ " foo  \t  \t", "{3}\r\nfoo" },
+		{ "hello\"world", "{11}\r\nhello\"world" },
+		{ "hello\\world", "{11}\r\nhello\\world" },
+		{ "hello\rworld", "{11}\r\nhello world" },
+		{ "hello\nworld", "{11}\r\nhello world" },
+		{ "hello\r\nworld", "{11}\r\nhello world" },
+		{ "hello\r\n  world", "{11}\r\nhello world" },
+		{ "hello  \r\n  world", "{11}\r\nhello world" },
+	};
+	string_t *str = t_str_new(128);
+	unsigned int i;
+
+	test_begin("imap_append_string_for_humans()");
+
+	for (i = 0; i < N_ELEMENTS(tests); i++) {
+		str_truncate(str, 0);
+		imap_append_string_for_humans(str, (const void *)tests[i].input,
+					      strlen(tests[i].input));
+		test_assert_idx(strcmp(tests[i].output, str_c(str)) == 0, i);
+	}
+	test_end();
+}
+
+static void test_imap_append_astring(void)
+{
+	static const struct {
+		const char *input, *output;
+	} tests[] = {
+		{ "", "\"\"" },
+		{ "NIL", "\"NIL\"" },
+		{ "niL", "\"niL\"" },
+		{ "ni", "ni" },
+		{ "\\", "\"\\\\\"" },
+		{ "\\\\", "\"\\\\\\\\\"" },
+		{ "\\\\\\", "\"\\\\\\\\\\\\\"" },
+		{ "\\\\\\\\", "\"\\\\\\\\\\\\\\\\\"" },
+		{ "\\\\\\\\\\", "{5}\r\n\\\\\\\\\\" },
+		{ "\\\\\\\\\\\\", "{6}\r\n\\\\\\\\\\\\" },
+		{ "\"", "\"\\\"\"" },
+		{ "\"\"", "\"\\\"\\\"\"" },
+		{ "\"\"\"", "\"\\\"\\\"\\\"\"" },
+		{ "\"\"\"\"", "\"\\\"\\\"\\\"\\\"\"" },
+		{ "\"\"\"\"\"", "{5}\r\n\"\"\"\"\"" },
+		{ "\"\"\"\"\"\"", "{6}\r\n\"\"\"\"\"\"" },
+		{ "\r", "{1}\r\n\r" },
+		{ "\n", "{1}\r\n\n" },
+		{ "\r\n", "{2}\r\n\r\n" },
+		{ "\x7f", "\"\x7f\"" },
+		{ "\x80", "{1}\r\n\x80" },
+		{ "\xff", "{1}\r\n\xff" },
+	};
+	string_t *str = t_str_new(128);
+	unsigned int i;
+
+	test_begin("test_imap_append_astring()");
+
+	for (i = 0; i < N_ELEMENTS(tests); i++) {
+		str_truncate(str, 0);
+		imap_append_astring(str, tests[i].input);
+		test_assert_idx(strcmp(tests[i].output, str_c(str)) == 0, i);
+	}
+	test_end();
+}
+
+static void test_imap_append_nstring(void)
+{
+	static const struct {
+		const char *input, *output;
+	} tests[] = {
+		{ "", "\"\"" },
+		{ NULL, "NIL" },
+		{ "NIL", "\"NIL\"" },
+		{ "\"America N.\"", "\"\\\"America N.\\\"\"" },
+		{ "\"America N.\", \"America S.\"", "\"\\\"America N.\\\", \\\"America S.\\\"\"" },
+		{ "\"America N.\", \"America S.\", \"Africa\"", "{36}\r\n\"America N.\", \"America S.\", \"Africa\"" },
+		{ "Antarctica\n Australia", "{21}\r\nAntarctica\n Australia" },
+		{ "ni", "\"ni\"" }
+	};
+	string_t *str = t_str_new(128);
+	unsigned int i;
+
+	test_begin("test_imap_append_nstring()");
+
+	for (i = 0; i < N_ELEMENTS(tests); i++) {
+		str_truncate(str, 0);
+		imap_append_nstring(str, tests[i].input);
+		test_assert_idx(strcmp(tests[i].output, str_c(str)) == 0, i);
+	}
+	test_end();
+}
+
+static void test_imap_append_nstring_nolf(void)
+{
+	static const struct {
+		const char *input, *output;
+	} tests[] = {
+		{ "", "\"\"" },
+		{ NULL, "NIL" },
+		{ "NIL", "\"NIL\"" },
+		{ "ni", "\"ni\"" },
+		{ "\"NIL\n foo", "\"\\\"NIL foo\"" },
+		{ "\"America N.\", \"America S.\", \"Africa\"", "{36}\r\n\"America N.\", \"America S.\", \"Africa\"" },
+		{ "foo\nbar", "\"foo bar\"" },
+		{ "foo\r\nbar", "\"foo bar\"" },
+		{ "foo\rbar", "\"foo bar\"" },
+		{ "foo\n  bar", "\"foo  bar\"" },
+		{ "foo\r\n  bar", "\"foo  bar\"" },
+		{ "foo\r  bar", "\"foo  bar\"" },
+		{ "foo\n\tbar", "\"foo\tbar\"" },
+		{ "foo\r\n\tbar", "\"foo\tbar\"" },
+		{ "foo\r\tbar", "\"foo\tbar\"" },
+		{ "foo\n bar", "\"foo bar\"" },
+		{ "foo\r\n bar", "\"foo bar\"" },
+		{ "foo\r bar", "\"foo bar\"" },
+		{ "\nfoo\r bar\r\n", "\" foo bar\"" }
+	};
+	unsigned int i;
+
+	test_begin("test_imap_append_nstring_nolf()");
+
+	for (i = 0; i < N_ELEMENTS(tests); i++) T_BEGIN {
+		string_t *str = t_str_new(1);
+		string_t *str2 = str_new(default_pool, 1);
+
+		str_truncate(str, 0);
+		imap_append_nstring_nolf(str, tests[i].input);
+		test_assert_idx(strcmp(tests[i].output, str_c(str)) == 0, i);
+
+		str_truncate(str2, 0);
+		imap_append_nstring_nolf(str2, tests[i].input);
+		test_assert_idx(strcmp(tests[i].output, str_c(str2)) == 0, i);
+
+		str_free(&str2);
+	} T_END;
+	test_end();
+}
+
+int main(void)
+{
+	static void (*const test_functions[])(void) = {
+		test_imap_append_string_for_humans,
+		test_imap_append_astring,
+		test_imap_append_nstring,
+		test_imap_append_nstring_nolf,
+		NULL
+	};
+	return test_run(test_functions);
+}
diff --git a/src/lib-imap/test-imap-url.c b/src/lib-imap/test-imap-url.c
new file mode 100644
index 0000000..a63ca33
--- /dev/null
+++ b/src/lib-imap/test-imap-url.c
@@ -0,0 +1,1029 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "net.h"
+#include "imap-url.h"
+#include "test-common.h"
+
+struct valid_imap_url_test {
+	const char *url;
+	enum imap_url_parse_flags flags;
+	struct imap_url url_base;
+
+	struct imap_url url_parsed;
+};
+
+/* Valid IMAP URL tests */
+static const struct valid_imap_url_test valid_url_tests[] = {
+	{
+		.url = "imap://localhost",
+		.url_parsed = {
+			.host = { .name = "localhost" } }
+	},{
+		.url = "imap://user@localhost",
+		.url_parsed = {
+			.host = { .name = "localhost" },
+			.userid = "user" }
+	},{
+		.url = "imap://user;AUTH=PLAIN@localhost",
+		.url_parsed = {
+			.host = { .name = "localhost" },
+			.userid = "user",
+			.auth_type = "PLAIN" }
+	},{
+		.url = "imap://;AUTH=PLAIN@localhost",
+		.url_parsed = {
+			.host = { .name = "localhost" },
+			.auth_type = "PLAIN" }
+	},{
+		.url = "imap://%68endri%6B;AUTH=GSS%41PI@%65%78%61%6d%70%6c%65.com",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "hendrik",
+			.auth_type = "GSSAPI" }
+	},{
+		.url = "imap://user@localhost:993",
+		.url_parsed = {
+			.host = { .name = "localhost" },
+			.userid = "user",
+			.port = 993 }
+	},{
+		.url = "imap://user@127.0.0.1",
+		.url_parsed = {
+			.host = {
+				.name = "127.0.0.1",
+				.ip = { .family = AF_INET } },
+			.userid = "user" }
+	},{
+		.url = "imap://user@[::1]",
+		.url_parsed = {
+			.host = {
+				.name = "[::1]",
+				.ip = { .family = AF_INET6 } },
+			.userid = "user" }
+	},{
+		.url = "imap://user@4example.com:423",
+		.url_parsed = {
+			.host = { .name = "4example.com" },
+			.userid = "user",
+			.port = 423 }
+	},{
+		.url = "imap://beelzebub@666.4example.com:999",
+		.url_parsed = {
+			.host = { .name = "666.4example.com" },
+			.userid = "beelzebub",
+			.port = 999 }
+	},{
+		.url = "imap://user@example.com/",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = NULL }
+	},{
+		.url = "imap://user@example.com/./",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = NULL }
+	},{
+		.url = "imap://user@example.com/INBOX",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX" }
+	},{
+		.url = "imap://user@example.com/INBOX/",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX" }
+	},{
+		.url = "imap://user@example.com//",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user"}
+	},{
+		.url = "imap://user@example.com/INBOX/Trash",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash" }
+	},{
+		.url = "imap://user@example.com/INBOX/Trash/..",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX" }
+	},{
+		.url = "imap://user@example.com/INBOX/Trash/../",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX" }
+	},{
+		.url = "imap://user@example.com/INBOX/Trash/../..",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = NULL }
+	},{
+		.url = "imap://user@example.com/INBOX.Trash",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX.Trash" }
+	},{
+		.url = "imap://user@example.com/INBOX%3BTrash",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX;Trash" }
+	},{
+		.url = "imap://user@example.com/INBOX;UIDVALIDITY=1341",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX", .uidvalidity = 1341 }
+	},{
+		.url = "imap://user@example.com/INBOX/;UIDVALIDITY=23423",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX", .uidvalidity = 23423 }
+	},{
+		.url = "imap://user@example.com/INBOX/Drafts;UIDVALIDITY=6567",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts", .uidvalidity = 6567 }
+	},{
+		.url = "imap://user@example.com/INBOX/Drafts;UIDVALIDITY=788/;UID=16",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts", .uidvalidity = 788,
+			.uid = 16 }
+	},{
+		.url = "imap://user@example.com/INBOX/Drafts;UIDVALIDITY=788/;UID=16/..",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts", .uidvalidity = 788,
+			.uid = 0 }
+	},{
+		.url = "imap://user@example.com/INBOX/Drafts;UIDVALIDITY=788/;UID=16/../..",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX", .uidvalidity = 0,
+			.uid = 0 }
+	},{
+		.url = "imap://user@example.com/INBOX/Junk;UIDVALIDITY=27667/"
+			";UID=434/;SECTION=HEADER",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Junk", .uidvalidity = 27667,
+			.uid = 434, .section = "HEADER" }
+	},{
+		.url = "imap://user@example.com/INBOX/Important/"
+			";UID=437/;SECTION=1.2.MIME",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Important",
+			.uid = 437, .section = "1.2.MIME" }
+	},{
+		.url = "imap://user@example.com/INBOX/Important/;UID=56/;SECTION=AA/BB",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Important",
+			.uid = 56, .section = "AA/BB" }
+	},{
+		.url = "imap://user@example.com/INBOX/Important/;UID=56/;SECTION=AA/BB/..",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Important",
+			.uid = 56, .section = "AA/" }
+	},{
+		.url = "imap://user@example.com/INBOX/Important/;UID=56/"
+			";SECTION=AA/BB/../..",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Important",
+			.uid = 56, .section = NULL }
+	},{
+		.url = "imap://user@example.com/INBOX/Important/;UID=234/"
+			";SECTION=HEADER.FIELDS%20(%22To%22%20%22From%22)",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Important",
+			.uid = 234, .section = "HEADER.FIELDS (\"To\" \"From\")" }
+	},{
+		.url = "imap://user@example.com/INBOX/Important/;UID=234/"
+			";PARTIAL=10.250",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Important",
+			.uid = 234, .section = NULL, .partial_offset = 10, .partial_size = 250 }
+	},{
+		.url = "imap://hendrik@example.com/INBOX/Important/;UID=34534/"
+			";SECTION=1.3.TEXT/;PARTIAL=0.34254",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "hendrik",
+			.mailbox = "INBOX/Important",
+			.uid = 34534, .section = "1.3.TEXT",
+			.partial_offset = 0, .partial_size = 34254 }
+	},{
+		.url = "imap://hendrik@example.com/INBOX/Sent"
+			";UIDVALIDITY=534?SUBJECT%20%22Frop?%22",
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "hendrik",
+			.mailbox = "INBOX/Sent", .uidvalidity = 534,
+			.search_program = "SUBJECT \"Frop?\"" }
+	},{
+		.url = "//hendrik@example.org/INBOX/Trash",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user" },
+		.url_parsed = {
+			.host = { .name = "example.org" },
+			.userid = "hendrik",
+			.mailbox = "INBOX/Trash" }
+	},{
+		.url = "/INBOX/Trash",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user" },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash" }
+	},{
+		.url = "user@example.com",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Accounts" },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Accounts/user@example.com" }
+	},{
+		.url = "Drafts",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/" },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts" }
+	},{
+		.url = "../Drafts",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash" },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts" }
+	},{
+		.url = "../Junk",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452 },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Junk",
+			.uidvalidity = 0 }
+	},{
+		.url = "../Junk;UIDVALIDITY=23",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452 },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Junk",
+			.uidvalidity = 23 }
+	},{
+		.url = "../../%23shared;UIDVALIDITY=23452",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 764 },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "#shared",
+			.uidvalidity = 23452 }
+	},{
+		.url = "../../%23news;UIDVALIDITY=546/;UID=456",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452,
+			.uid = 65 },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "#news",
+			.uidvalidity = 546,
+			.uid = 456 }
+	},{
+		.url = "",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452 },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452 }
+	},{
+		.url = "",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452,
+			.uid = 65 },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452,
+			.uid = 65 }
+	},{
+		.url = "",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452,
+			.uid = 65,
+			.section = "AA/BB",
+			.have_partial = TRUE, .partial_offset = 1024, .partial_size = 1024 },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452,
+			.uid = 65,
+			.section = "AA/BB",
+			.have_partial = TRUE, .partial_offset = 1024, .partial_size = 1024 }
+	},{
+		.url = "",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452,
+			.uid = 65,
+			.have_partial = TRUE, .partial_offset = 1024, .partial_size = 1024 },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452,
+			.uid = 65,
+			.have_partial = TRUE, .partial_offset = 1024, .partial_size = 1024 }
+	},{
+		.url = ";UID=4767",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452,
+			.uid = 65 },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452,
+			.uid = 4767 }
+	},{
+		.url = ";UID=4767",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452},
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452,
+			.uid = 4767 }
+	},{
+		.url = "../;UID=4767",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452,
+			.uid = 65 },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX",
+			.uidvalidity = 0,
+			.uid = 4767 }
+	},{
+		.url = "../;UID=4767/;SECTION=TEXT",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452,
+			.uid = 65,
+			.section = "1.2.3.MIME" },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Trash",
+			.uidvalidity = 23452,
+			.uid = 4767,
+			.section = "TEXT" }
+	},{
+		.url = ";SECTION=TEXT",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts",
+			.uidvalidity = 769,
+			.uid = 43,
+			.section = "1.2.3.MIME" },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts",
+			.uidvalidity = 769,
+			.uid = 43,
+			.section = "TEXT" }
+	},{
+		.url = "..",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts",
+			.uidvalidity = 769,
+			.uid = 43,
+			.section = "AA/BB" },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts",
+			.uidvalidity = 769,
+			.uid = 43 }
+	},{
+		.url = "../;SECTION=CC",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts",
+			.uidvalidity = 769,
+			.uid = 43,
+			.section = "AA/BB" },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts",
+			.uidvalidity = 769,
+			.uid = 43,
+			.section = "CC" }
+	},{
+		.url = "CC",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts",
+			.uidvalidity = 769,
+			.uid = 43,
+			.section = "AA/BB" },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts",
+			.uidvalidity = 769,
+			.uid = 43,
+			.section = "AA/CC" }
+	},{
+		.url = ";PARTIAL=1024.1024",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts",
+			.uidvalidity = 769,
+			.uid = 43,
+			.have_partial = TRUE, .partial_offset = 0, .partial_size = 1024 },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts",
+			.uidvalidity = 769,
+			.uid = 43,
+			.have_partial = TRUE, .partial_offset = 1024, .partial_size = 1024 }
+	},{
+		.url = "../CC/;PARTIAL=0.512",
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts",
+			.uidvalidity = 769,
+			.uid = 43,
+			.section = "AA/BB",
+			.have_partial = TRUE, .partial_offset = 1024, .partial_size = 1024 },
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX/Drafts",
+			.uidvalidity = 769,
+			.uid = 43,
+			.section = "AA/CC",
+			.have_partial = TRUE, .partial_offset = 0, .partial_size = 512 }
+	},{
+		.url = "imap://user@example.com/INBOX/;UID=377;URLAUTH=anonymous",
+		.flags = IMAP_URL_PARSE_ALLOW_URLAUTH,
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX",
+			.uid = 377,
+			.uauth_rumpurl = "imap://user@example.com/INBOX/;UID=377"
+				";URLAUTH=anonymous",
+			.uauth_access_application = "anonymous"}
+	},{
+		.url = "imap://user@example.com/INBOX/;UID=377"
+			";URLAUTH=anonymous:internal:4142434445464748494A4B4C4D4E4F5051525354",
+		.flags = IMAP_URL_PARSE_ALLOW_URLAUTH,
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX",
+			.uid = 377,
+			.uauth_rumpurl = "imap://user@example.com/INBOX/;UID=377"
+				";URLAUTH=anonymous",
+			.uauth_access_application = "anonymous",
+			.uauth_mechanism = "internal",
+			.uauth_token = (const unsigned char *)"ABCDEFGHIJKLMNOPQRST",
+			.uauth_token_size = 20}
+	},{
+		.url = "imap://user@example.com/INBOX/;UID=377"
+			";EXPIRE=2011-02-12T12:45:14+01:00"
+			";URLAUTH=user+frop:internal:4142434445464748494A4B4C4D4E4F5051525354",
+		.flags = IMAP_URL_PARSE_ALLOW_URLAUTH,
+		.url_parsed = {
+			.host = { .name = "example.com" },
+			.userid = "user",
+			.mailbox = "INBOX",
+			.uid = 377,
+			.uauth_rumpurl = "imap://user@example.com/INBOX/;UID=377"
+				";EXPIRE=2011-02-12T12:45:14+01:00;URLAUTH=user+frop",
+			.uauth_access_application = "user",
+			.uauth_access_user = "frop",
+			.uauth_mechanism = "internal",
+			.uauth_token = (const unsigned char *)"ABCDEFGHIJKLMNOPQRST",
+			.uauth_token_size = 20}
+	}
+};
+
+static const unsigned int valid_url_test_count = N_ELEMENTS(valid_url_tests);
+
+static void test_imap_url_valid(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < valid_url_test_count; i++) T_BEGIN {
+		const char *url = valid_url_tests[i].url;
+		enum imap_url_parse_flags flags = valid_url_tests[i].flags;
+		const struct imap_url *urlt = &valid_url_tests[i].url_parsed;
+		const struct imap_url *urlb = &valid_url_tests[i].url_base;
+		struct imap_url *urlp;
+		const char *error = NULL;
+
+		test_begin(t_strdup_printf("imap url valid [%d]", i));
+
+		if (urlb->host.name == NULL) urlb = NULL;
+		if (imap_url_parse(url, urlb, flags, &urlp, &error) < 0)
+			urlp = NULL;
+
+		test_out_reason(t_strdup_printf("imap_url_parse(%s)",
+			valid_url_tests[i].url), urlp != NULL, error);
+		if (urlp != NULL) {
+			if (urlp->host.name == NULL || urlt->host.name == NULL) {
+				test_out_quiet(t_strdup_printf("url->host.name = %s", urlp->host.name),
+					       urlp->host.name == urlt->host.name);
+			} else {
+				test_out_quiet(t_strdup_printf("url->host.name = %s", urlp->host.name),
+					       strcmp(urlp->host.name, urlt->host.name) == 0);
+			}
+			if (urlp->userid == NULL || urlt->userid == NULL) {
+				test_out_quiet(t_strdup_printf("url->userid = %s", urlp->userid),
+					       urlp->userid == urlt->userid);
+			} else {
+				test_out_quiet(t_strdup_printf("url->userid = %s", urlp->userid),
+					       strcmp(urlp->userid, urlt->userid) == 0);
+			}
+			if (urlp->auth_type == NULL || urlt->auth_type == NULL) {
+				test_out_quiet(t_strdup_printf("url->auth_type = %s", urlp->auth_type),
+					       urlp->auth_type == urlt->auth_type);
+			} else {
+				test_out_quiet(t_strdup_printf("url->auth_type = %s", urlp->auth_type),
+					       strcmp(urlp->auth_type, urlt->auth_type) == 0);
+			}
+			if (urlp->port == 0) {
+				test_out_quiet("url->port = (unspecified)",
+					       urlp->port == urlt->port);
+			} else {
+				test_out_quiet(t_strdup_printf("url->port = %u", urlp->port),
+					       urlp->port == urlt->port);
+			}
+			if (urlp->host.ip.family == 0) {
+				test_out_quiet("url->host.ip = (unspecified)",
+					       urlp->host.ip.family == urlt->host.ip.family);
+			} else {
+				test_out_quiet("url->host.ip = (valid)",
+					       urlp->host.ip.family == urlt->host.ip.family);
+			}
+			if (urlp->mailbox == NULL || urlt->mailbox == NULL) {
+				test_out_quiet(t_strdup_printf("url->mailbox = %s", urlp->mailbox),
+					       urlp->mailbox == urlt->mailbox);
+			} else {
+				test_out_quiet(t_strdup_printf("url->mailbox = %s", urlp->mailbox),
+					       strcmp(urlp->mailbox, urlt->mailbox) == 0);
+			}
+			test_out_quiet(t_strdup_printf("url->uidvalidity = %u", urlp->uidvalidity),
+				       urlp->uidvalidity == urlt->uidvalidity);
+			test_out_quiet(t_strdup_printf("url->uid = %u", urlp->uid),
+				       urlp->uid == urlt->uid);
+			if (urlp->section == NULL || urlt->section == NULL) {
+				test_out_quiet(t_strdup_printf("url->section = %s", urlp->section),
+					       urlp->section == urlt->section);
+			} else {
+				test_out_quiet(t_strdup_printf("url->section = %s", urlp->section),
+					       strcmp(urlp->section, urlt->section) == 0);
+			}
+			test_out_quiet(t_strdup_printf("url->partial = %"PRIuUOFF_T".%"PRIuUOFF_T,
+						       urlp->partial_offset, urlp->partial_size),
+				       urlp->partial_offset == urlt->partial_offset &&
+				       urlp->partial_size == urlt->partial_size);
+			if (urlp->search_program == NULL || urlt->search_program == NULL) {
+				test_out_quiet(t_strdup_printf(
+						       "url->search_program = %s", urlp->search_program),
+					       urlp->search_program == urlt->search_program);
+			} else {
+				test_out_quiet(t_strdup_printf(
+						       "url->search_program = %s", urlp->search_program),
+					       strcmp(urlp->search_program, urlt->search_program) == 0);
+			}
+			if (urlt->uauth_rumpurl != NULL) {
+				if (urlp->uauth_rumpurl == NULL) {
+					test_out_quiet("url->uauth_rumpurl = NULL", FALSE);
+				} else {
+					test_out_quiet(t_strdup_printf(
+							       "url->uauth_rumpurl = %s", urlp->uauth_rumpurl),
+						       strcmp(urlp->uauth_rumpurl, urlt->uauth_rumpurl) == 0);
+				}
+				if (urlp->uauth_access_application == NULL ||
+				    urlt->uauth_access_application == NULL) {
+					test_out_quiet(t_strdup_printf("url->uauth_access_application = %s",
+								       urlp->uauth_access_application),
+						       urlp->uauth_access_application == urlt->uauth_access_application);
+				} else {
+					test_out_quiet(t_strdup_printf("url->uauth_access_application = %s",
+								       urlp->uauth_access_application),
+						       strcmp(urlp->uauth_access_application,
+							      urlt->uauth_access_application) == 0);
+				}
+				if (urlp->uauth_access_user == NULL ||
+				    urlt->uauth_access_user == NULL) {
+					test_out_quiet(t_strdup_printf("url->uauth_access_user = %s",
+								       urlp->uauth_access_user),
+						       urlp->uauth_access_user == urlt->uauth_access_user);
+				} else {
+					test_out_quiet(t_strdup_printf("url->uauth_access_user = %s",
+								       urlp->uauth_access_user),
+						       strcmp(urlp->uauth_access_user,
+							      urlt->uauth_access_user) == 0);
+				}
+				if (urlp->uauth_mechanism == NULL || urlt->uauth_mechanism == NULL) {
+					test_out_quiet(t_strdup_printf(
+							       "url->uauth_mechanism = %s", urlp->uauth_mechanism),
+						       urlp->uauth_mechanism == urlt->uauth_mechanism);
+				} else {
+					test_out_quiet(t_strdup_printf(
+							"url->uauth_mechanism = %s", urlp->uauth_mechanism),
+						       strcmp(urlp->uauth_mechanism, urlt->uauth_mechanism) == 0);
+				}
+				if (urlp->uauth_token == NULL || urlt->uauth_token == NULL) {
+					test_out_quiet(t_strdup_printf(
+							       "url->uauth_token = %s", urlp->uauth_token),
+						       urlp->uauth_token == urlt->uauth_token);
+				} else {
+					bool equal = urlp->uauth_token_size == urlt->uauth_token_size;
+					size_t i;
+					test_out_quiet(t_strdup_printf(
+							       "url->uauth_token_size = %zu", urlp->uauth_token_size),
+						       equal);
+
+					if (equal) {
+						for (i = 0; i < urlp->uauth_token_size; i++) {
+							if (urlp->uauth_token[i] != urlt->uauth_token[i]) {
+								equal = FALSE;
+								break;
+							}
+						}
+						test_out_quiet(t_strdup_printf("url->uauth_token [index=%d]", (int)i),
+							       equal);
+					}
+				}
+			}
+		}
+
+		test_end();
+	} T_END;
+}
+
+struct invalid_imap_url_test {
+	const char *url;
+	enum imap_url_parse_flags flags;
+	struct imap_url url_base;
+};
+
+static const struct invalid_imap_url_test invalid_url_tests[] = {
+	{
+		.url = "http://www.dovecot.org"
+	},{
+		.url = "imap:/INBOX"
+	},{
+		.url = "imap://user@example.com/INBOX",
+		.flags = IMAP_URL_PARSE_REQUIRE_RELATIVE,
+		.url_base = {
+			.host = { .name = "example.com" },
+			.userid = "user" }
+	},{
+		.url = ""
+	},{
+		.url = "/INBOX/;UID=377"
+	},{
+		.url = "imap://user@example.com/INBOX/;UID=377/;SECTION=TEXT?ALL"
+	},{
+		.url = "imap://user@example.com/INBOX/?"
+	},{
+		.url = "imap://user@example.com/INBOX/#Fragment"
+	},{
+		.url = "imap://user@example.com/INBOX/\""
+	},{
+		.url = "imap:///INBOX"
+	},{
+		.url = "imap://[]/INBOX"
+	},{
+		.url = "imap://[v08.234:232:234:234:2221]/INBOX"
+	},{
+		.url = "imap://[1::34a:34:234::6]/INBOX"
+	},{
+		.url = "imap://example%a.com/INBOX"
+	},{
+		.url = "imap://example.com%/INBOX"
+	},{
+		.url = "imap://example%00.com/INBOX"
+	},{
+		.url = "imap://example.com:65539/INBOX"
+	},{
+		.url = "imap://user;ATH=frop@example.com"
+	},{
+		.url = "imap://user;AUTH=frop;friep@example.com"
+	},{
+		.url = "imap://user;AUTH=@example.com"
+	},{
+		.url = "imap://user:password@example.com"
+	},{
+		.url = "imap://user;AUTH=A:B@example.com"
+	},{
+		.url = "imap://user%@example.com"
+	},{
+		.url = "imap://user%00@example.com"
+	},{
+		.url = "imap://user%ar;AUTH=*@example.com"
+	},{
+		.url = "imap://;AUTH=FR%etD@example.com"
+	},{
+		.url = "imap://user;AUTH=%@example.com"
+	},{
+		.url = "imap://user;AUTH=%00@example.com"
+	},{
+		.url = "imap://example.com/INBOX/%00/"
+	},{
+		.url = "imap://example.com/INBOX/%0r/"
+	},{
+		.url = "imap://example.com/INBOX/Trash/%/"
+	},{
+		.url = "imap://example.com/INBOX;UIDVALIDITY=23423;FROP=friep/"
+	},{
+		.url = "imap://example.com/INBOX;UIDVALIDITY=0/;UID=377"
+	},{
+		.url = "imap://example.com/INBOX;UIDVALIDITY=/"
+	},{
+		.url = "imap://example.com/INBOX;UIDVALIDITY=33a/"
+	},{
+		.url = "imap://example.com/INBOX;FROP=friep/"
+	},{
+		.url = "imap://example.com/INBOX/;UID=377;FROP=friep/"
+	},{
+		.url = "imap://example.com/INBOX/;UID=0/"
+	},{
+		.url = "imap://example.com/INBOX/;UID=/"
+	},{
+		.url = "imap://example.com/INBOX/;UID=5e6/"
+	},{
+		.url = "imap://example.com/INBOX/;UID=35/;SECTION=ALL;FROP=43/"
+	},{
+		.url = "imap://example.com/INBOX/;UID=35/;SECTION=/"
+	},{
+		.url = "imap://example.com/INBOX/;UID=34/;PARTIAL="
+	},{
+		.url = "imap://example.com/INBOX/;UID=34/;PARTIAL=0."
+	},{
+		.url = "imap://example.com/INBOX/;UID=34/;PARTIAL=0.e10"
+	},{
+		.url = "imap://example.com/INBOX/;UID=34/;PARTIAL=.3"
+	},{
+		.url = "imap://example.com/INBOX/;UID=34/;PARTIAL=5t4.3"
+	},{
+		.url = "imap://example.com/INBOX/;UID=34/;PARTIAL=0.0"
+	},{
+		.url = "imap://example.com/INBOX/;UID=34/;PARTIAL=0.23409823409820938409823"
+	},{
+		.url = "imap://example.com/INBOX/;UID=377/;FROP=34"
+	},{
+		.url = "imap://example.com/INBOX/;UID=377;FROP=34"
+	},{
+		.url = "imap://example.com/INBOX/;UID=377;EXPIRE=2010-02-02T12:00:12Z"
+	},{
+		.url = "imap://example.com/INBOX/;UID=377"
+			";URLAUTH=anonymous:internal:0ad89fafd79f54afe4523f45aadf2afe"
+	},{
+		.url = "imap://example.com/INBOX/;UID=377;EXPIRE=2011-15-02T00:00:00Z"
+			";URLAUTH=anonymous:internal:0ad89fafd79f54afe4523f45aadf2afe",
+		.flags = IMAP_URL_PARSE_ALLOW_URLAUTH
+	},{
+		.url = "imap://example.com/INBOX/;UID=377;EXPIRE=2011-10-02T00:00:00Z",
+		.flags = IMAP_URL_PARSE_ALLOW_URLAUTH
+	},{
+		.url = "/INBOX/;UID=377;EXPIRE=2011-10-02T00:00:00Z"
+			";URLAUTH=anonymous:internal:0ad89fafd79f54afe4523f45aadf2afe",
+		.flags = IMAP_URL_PARSE_ALLOW_URLAUTH
+	},{
+		.url = "imap://example.com/INBOX/;UID=377;URLAUTH=",
+		.flags = IMAP_URL_PARSE_ALLOW_URLAUTH
+	},{
+		.url = "imap://example.com/INBOX/;UID=377"
+			";URLAUTH=:internal:0ad89fafd79f54afe4523f45aadf2afe",
+		.flags = IMAP_URL_PARSE_ALLOW_URLAUTH
+	},{
+		.url = "imap://example.com/INBOX/;UID=377"
+			";URLAUTH=user+:internal:0ad89fafd79f54afe4523f45aadf2afe",
+		.flags = IMAP_URL_PARSE_ALLOW_URLAUTH
+	},{
+		.url = "imap://example.com/INBOX/;UID=377"
+			";URLAUTH=+frop:internal:0ad89fafd79f54afe4523f45aadf2afe",
+		.flags = IMAP_URL_PARSE_ALLOW_URLAUTH
+	},{
+		.url = "imap://example.com/INBOX/;UID=377;URLAUTH=anonymous:",
+		.flags = IMAP_URL_PARSE_ALLOW_URLAUTH
+	},{
+		.url = "imap://example.com/INBOX/;UID=377"
+			";URLAUTH=anonymous::0ad89fafd79f54afe4523f45aadf2afe",
+		.flags = IMAP_URL_PARSE_ALLOW_URLAUTH
+	},{
+		.url = "imap://example.com/INBOX/;UID=377;URLAUTH=anonymous:internal:",
+		.flags = IMAP_URL_PARSE_ALLOW_URLAUTH
+	},{
+		.url = "imap://example.com/INBOX/;UID=377"
+			";URLAUTH=anonymous:internal:fd79f54afe4523",
+		.flags = IMAP_URL_PARSE_ALLOW_URLAUTH
+	},{
+		.url = "imap://example.com/INBOX/;UID=377;EXPIRE=2011-10-02T00:00:00Z"
+			";URLAUTH=anonymous:internal:0ad89fafd79f54afe4523q45aadf2afe",
+		.flags = IMAP_URL_PARSE_ALLOW_URLAUTH
+	},
+};
+
+static const unsigned int invalid_url_test_count = N_ELEMENTS(invalid_url_tests);
+
+static void test_imap_url_invalid(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < invalid_url_test_count; i++) T_BEGIN {
+		const char *url = invalid_url_tests[i].url;
+		enum imap_url_parse_flags flags = invalid_url_tests[i].flags;
+		const struct imap_url *urlb = &invalid_url_tests[i].url_base;
+		struct imap_url *urlp;
+		const char *error = NULL;
+
+		if (urlb->host.name == NULL)
+			urlb = NULL;
+
+		test_begin(t_strdup_printf("imap url invalid [%d]", i));
+
+		if (imap_url_parse(url, urlb, flags, &urlp, &error) < 0)
+			urlp = NULL;
+		test_out_reason(t_strdup_printf("parse %s", url), urlp == NULL, error);
+
+		test_end();
+	} T_END;
+
+}
+
+static const char *parse_create_url_tests[] = {
+	"imap://host.example.com/",
+	"imap://10.0.0.1/",
+	"imap://[::1]/",
+	"imap://user@host.example.com/",
+	"imap://user@host.example.com:993/",
+	"imap://su%3auser@host.example.com/",
+	"imap://user;AUTH=PLAIN@host.example.com/",
+	"imap://user;AUTH=PLAIN@host.example.com/INBOX",
+	"imap://user;AUTH=PLAIN@host.example.com/INBOX/;UID=5",
+	"imap://user;AUTH=PLAIN@host.example.com/INBOX;UIDVALIDITY=15/;UID=5",
+	"imap://user;AUTH=PLAIN@host.example.com/INBOX;UIDVALIDITY=15/;UID=5"
+		"/;SECTION=TEXT",
+	"imap://user;AUTH=PLAIN@host.example.com/INBOX;UIDVALIDITY=15/;UID=5"
+		"/;SECTION=TEXT/;PARTIAL=1",
+	"imap://user;AUTH=PLAIN@host.example.com/INBOX;UIDVALIDITY=15/;UID=5"
+		"/;SECTION=TEXT/;PARTIAL=1.14",
+	"imap://user;AUTH=PLAIN@host.example.com/INBOX;UIDVALIDITY=15/;UID=5"
+		"/;SECTION=TEXT/;PARTIAL=1.14;URLAUTH=anonymous",
+	"imap://user;AUTH=PLAIN@host.example.com/INBOX;UIDVALIDITY=15/;UID=5"
+		"/;SECTION=TEXT/;PARTIAL=1.14;URLAUTH=user+username",
+	"imap://user;AUTH=PLAIN@host.example.com/INBOX?SUBJECT%20%22Frop?%22",
+	"imap://user%3ba@host.example.com/",
+	"imap://user%40example.com@host.example.com/",
+	"imap://user%40example.com;AUTH=STR%23ANGE@host.example.com/",
+	"imap://user;AUTH=PLAIN@host.example.com/INBOX/Important%3bWork",
+	"imap://user@host.example.com/%23shared/news",
+	"imap://user@host.example.com/INBOX;UIDVALIDITY=15/;UID=5"
+		"/;SECTION=HEADER.FIELDS%20(DATE%20FROM)",
+	"imap://user@host.example.com/INBOX;UIDVALIDITY=15/;UID=5"
+		"/;SECTION=TEXT/;PARTIAL=1.14;URLAUTH=user+user%3bname",
+};
+
+static const unsigned int parse_create_url_test_count = N_ELEMENTS(parse_create_url_tests);
+
+static void test_imap_url_parse_create(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < parse_create_url_test_count; i++) T_BEGIN {
+		const char *url = parse_create_url_tests[i];
+		struct imap_url *urlp;
+		const char *error = NULL;
+
+		test_begin(t_strdup_printf("imap url parse/create [%d]", i));
+
+		if (imap_url_parse
+			(url, NULL, IMAP_URL_PARSE_ALLOW_URLAUTH, &urlp, &error) < 0)
+			urlp = NULL;
+		test_out_reason(t_strdup_printf("parse  %s", url), urlp != NULL, error);
+		if (urlp != NULL) {
+			const char *urlnew = imap_url_create(urlp);
+			test_out(t_strdup_printf
+				 ("create %s", urlnew), strcmp(url, urlnew) == 0);
+		}
+
+		test_end();
+	} T_END;
+
+}
+
+
+int main(void)
+{
+	static void (*const test_functions[])(void) = {
+		test_imap_url_valid,
+		test_imap_url_invalid,
+		test_imap_url_parse_create,
+		NULL
+	};
+	return test_run(test_functions);
+}
diff --git a/src/lib-imap/test-imap-utf7.c b/src/lib-imap/test-imap-utf7.c
new file mode 100644
index 0000000..216eebf
--- /dev/null
+++ b/src/lib-imap/test-imap-utf7.c
@@ -0,0 +1,216 @@
+/* Copyright (c) 2008-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "str.h"
+#include "unichar.h"
+#include "imap-utf7.h"
+#include "test-common.h"
+
+static void test_imap_utf7_by_example(void)
+{
+	static const struct test {
+		const char *utf8;
+		const char *mutf7;
+	} tests[] = {
+		{ "&&x&&", "&-&-x&-&-" },
+		{ "~peter/mail/\xe5\x8f\xb0\xe5\x8c\x97/\xe6\x97\xa5\xe6\x9c\xac\xe8\xaa\x9e",
+		  "~peter/mail/&U,BTFw-/&ZeVnLIqe-" },
+		{ "tiet\xc3\xa4&j\xc3\xa4&", "tiet&AOQ-&-j&AOQ-&-" }, /* & is always encoded as &- */
+		{ "p\xe4\xe4", NULL },
+		{ NULL, "&" },
+		{ NULL, "&Jjo" },
+		{ NULL, "&Jjo!" },
+		{ NULL, "&U,BTFw-&ZeVnLIqe-" } /* unnecessary shift */
+	};
+	string_t *dest, *dest2;
+	unsigned int i;
+
+	dest = t_str_new(256);
+	dest2 = t_str_new(256);
+
+	test_begin("imap mutf7 examples");
+	for (i = 0; i < N_ELEMENTS(tests); i++) {
+		str_truncate(dest, 0);
+		if (tests[i].utf8 != NULL) {
+			if (imap_utf8_to_utf7(tests[i].utf8, dest) < 0)
+				test_assert_idx(tests[i].mutf7 == NULL, i);
+			else
+				test_assert_idx(null_strcmp(tests[i].mutf7, str_c(dest)) == 0, i);
+		} else {
+			/* invalid mUTF-7 - test that escaping works */
+			str_truncate(dest2, 0);
+			imap_utf7_to_utf8_escaped(tests[i].mutf7, "%", dest);
+			imap_escaped_utf8_to_utf7(str_c(dest), '%', dest2);
+			test_assert_idx(strcmp(tests[i].mutf7, str_c(dest2)) == 0, i);
+		}
+		if (tests[i].mutf7 != NULL) {
+			str_truncate(dest, 0);
+			if (imap_utf7_to_utf8(tests[i].mutf7, dest) < 0)
+				test_assert_idx(tests[i].utf8 == NULL, i);
+			else
+				test_assert_idx(null_strcmp(tests[i].utf8, str_c(dest)) == 0, i);
+			test_assert_idx(imap_utf7_is_valid(tests[i].mutf7) != (tests[i].utf8 == NULL), i);
+		}
+	}
+
+	str_truncate(dest, 0);
+	imap_utf7_to_utf8_escaped(".foo%", "%.", dest);
+	test_assert_strcmp(str_c(dest), "%2efoo%25");
+
+	str_truncate(dest, 0);
+	test_assert(imap_escaped_utf8_to_utf7("%foo%2ebar", '%', dest) == 0);
+	test_assert_strcmp(str_c(dest), "%foo.bar");
+
+	test_end();
+}
+
+static void test_imap_utf7_ucs4_cases(void)
+{
+	string_t *src, *dest;
+	const char *orig_src;
+	unsigned int i, j;
+	unichar_t chr;
+
+	src = t_str_new(256);
+	dest = t_str_new(256);
+
+	test_begin("imap mutf7 ucs4 cases");
+	for (chr = 0xffff; chr <= 0x10010; chr++) T_BEGIN {
+		for (i = 1; i <= 10; i++) {
+			str_truncate(src, 0);
+			str_truncate(dest, 0);
+			for (j = 0; j < i; j++) {
+				if (j % 3 == 0)
+					str_append_c(src, 'x');
+				if (j % 5 == 0)
+					str_append_c(src, '&');
+				uni_ucs4_to_utf8_c(chr, src);
+			}
+
+			orig_src = t_strdup(str_c(src));
+			str_truncate(src, 0);
+
+			test_assert_idx(imap_utf8_to_utf7(orig_src, dest) == 0, chr*100+i);
+			test_assert_idx(imap_utf7_to_utf8(str_c(dest), src) == 0, chr*100+i);
+			test_assert_idx(strcmp(str_c(src), orig_src) == 0, chr+100+i);
+		}
+	} T_END;
+	test_end();
+}
+
+static const char mb64[64]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
+static void test_imap_utf7_non_utf16(void)
+{
+	string_t *dest, *dest2;
+	unsigned int i;
+
+	test_begin("imap mutf7 non-utf16");
+	dest = t_str_new(32);
+	dest2 = t_str_new(32);
+	for (i = 0; i <= 255; ++i) {
+		/* Invalid, code a single 8-bit octet */
+		const char csrc[] = {
+			'&',
+			mb64[i >> 2],
+			mb64[(i & 3) << 4],
+			'-',
+			'\0'
+		};
+		test_assert_idx(!imap_utf7_is_valid(csrc), i);
+
+		/* escaping can reverse the original string */
+		str_truncate(dest, 0);
+		str_truncate(dest2, 0);
+		imap_utf7_to_utf8_escaped(csrc, "%", dest);
+		imap_escaped_utf8_to_utf7(str_c(dest), '%', dest2);
+		test_assert_idx(strcmp(csrc, str_c(dest2)) == 0, i);
+	}
+	for (i = 0; i <= 255; ++i) {
+		/* Invalid, U+00E4 followed by a single octet */
+		const char csrc[] = {
+			'&',
+			mb64[                       (0x00 >> 2)],
+			mb64[((0x00 & 0x03) << 4) | (0xe4 >> 4)],
+			mb64[((0xe4 & 0x0f) << 2) | (   i >> 6)],
+			mb64[     i & 0x3f                     ],
+			'-',
+			'\0'
+		};
+		test_assert_idx(!imap_utf7_is_valid(csrc), i);
+
+		/* escaping can reverse the original string */
+		str_truncate(dest, 0);
+		str_truncate(dest2, 0);
+		imap_utf7_to_utf8_escaped(csrc, "%", dest);
+		imap_escaped_utf8_to_utf7(str_c(dest), '%', dest2);
+		test_assert_idx(strcmp(csrc, str_c(dest2)) == 0, i);
+	}
+	test_end();
+}
+
+static void test_imap_utf7_bad_ascii(void)
+{
+	string_t *dest;
+	char csrc[1+1];
+	unsigned int i;
+
+	dest = t_str_new(256);
+
+	test_begin("imap mutf7 bad ascii");
+	for (i = 1; i <= 0x7f; ++i) {
+		if (i == ' ')
+			i = 0x7f;
+		csrc[0] = i;
+		csrc[1] = '\0';
+		test_assert_idx(!imap_utf7_is_valid(csrc), i);
+		str_truncate(dest, 0);
+		test_assert_idx(imap_utf7_to_utf8(csrc, dest) < 0, i);
+	}
+	test_end();
+}
+
+static void test_imap_utf7_unnecessary(void)
+{
+	string_t *dest;
+	char csrc[1+3+1+1];
+	unsigned int i;
+
+	dest = t_str_new(256);
+
+	test_begin("imap mutf7 unnecessary");
+	for (i = 0x20; i < 0x7f; ++i) {
+		/* Create an invalid escaped encoding of a simple char or '&' */
+		csrc[0] = '&';
+		csrc[1] = mb64[                       (0x00 >> 2)];
+		csrc[2] = mb64[((0x00 & 0x03) << 4) | (   i >> 4)];
+		csrc[3] = mb64[((   i & 0x0f) << 2) |     0      ];
+		csrc[4] = '-';
+		csrc[5] = '\0';
+		test_assert_idx(!imap_utf7_is_valid(csrc), i);
+		str_truncate(dest, 0);
+		test_assert_idx(imap_utf7_to_utf8(csrc, dest) < 0, i);
+
+		/* All self-coding characters must self-code */
+		if (i == '&')
+			continue;
+		csrc[0] = i;
+		csrc[1] = '\0';
+		str_truncate(dest, 0);
+		test_assert_idx(imap_utf8_to_utf7(csrc, dest) >= 0, i);
+		test_assert_idx(strcmp(csrc, str_c(dest)) == 0, i);
+	}
+	test_end();
+}
+
+int main(void)
+{
+	static void (*const test_functions[])(void) = {
+		test_imap_utf7_by_example,
+		test_imap_utf7_ucs4_cases,
+		test_imap_utf7_non_utf16,
+		test_imap_utf7_bad_ascii,
+		test_imap_utf7_unnecessary,
+		NULL
+	};
+	return test_run(test_functions);
+}
diff --git a/src/lib-imap/test-imap-util.c b/src/lib-imap/test-imap-util.c
new file mode 100644
index 0000000..90f59a1
--- /dev/null
+++ b/src/lib-imap/test-imap-util.c
@@ -0,0 +1,79 @@
+/* Copyright (c) 2009-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "str.h"
+#include "mail-types.h"
+#include "imap-arg.h"
+#include "imap-util.h"
+#include "test-common.h"
+
+static void test_imap_parse_system_flag(void)
+{
+	test_begin("imap_parse_system_flag");
+	test_assert(imap_parse_system_flag("\\aNswered") == MAIL_ANSWERED);
+	test_assert(imap_parse_system_flag("\\fLagged") == MAIL_FLAGGED);
+	test_assert(imap_parse_system_flag("\\dEleted") == MAIL_DELETED);
+	test_assert(imap_parse_system_flag("\\sEen") == MAIL_SEEN);
+	test_assert(imap_parse_system_flag("\\dRaft") == MAIL_DRAFT);
+	test_assert(imap_parse_system_flag("\\rEcent") == MAIL_RECENT);
+	test_assert(imap_parse_system_flag("answered") == 0);
+	test_assert(imap_parse_system_flag("\\broken") == 0);
+	test_assert(imap_parse_system_flag("\\") == 0);
+	test_assert(imap_parse_system_flag("") == 0);
+	test_end();
+}
+
+static void test_imap_write_arg(void)
+{
+	ARRAY_TYPE(imap_arg_list) list_root, list_sub;
+	struct imap_arg *arg;
+
+	t_array_init(&list_sub, 2);
+	arg = array_append_space(&list_sub);
+	arg->type = IMAP_ARG_ATOM;
+	arg->_data.str = "foo";
+	arg = array_append_space(&list_sub);
+	arg->type = IMAP_ARG_EOL;
+
+	t_array_init(&list_root, 2);
+	arg = array_append_space(&list_root);
+	arg->type = IMAP_ARG_LIST;
+	arg->_data.list = list_sub;
+	arg = array_append_space(&list_root);
+	arg->type = IMAP_ARG_STRING;
+	arg->_data.str = "bar";
+	arg = array_append_space(&list_root);
+	arg->type = IMAP_ARG_EOL;
+
+	const struct {
+		struct imap_arg input;
+		const char *output;
+	} tests[] = {
+		{ { .type = IMAP_ARG_NIL }, "NIL" },
+		{ { .type = IMAP_ARG_ATOM, ._data.str = "atom" }, "atom" },
+		{ { .type = IMAP_ARG_STRING, ._data.str = "s\\t\"ring" }, "\"s\\\\t\\\"ring\"" },
+		{ { .type = IMAP_ARG_LITERAL, ._data.str = "l\\i\"t\r\neral" }, "{11}\r\nl\\i\"t\r\neral" },
+		{ { .type = IMAP_ARG_LITERAL_SIZE, ._data.literal_size = 12345678 }, "<12345678 byte literal>" },
+		{ { .type = IMAP_ARG_LITERAL_SIZE_NONSYNC, ._data.literal_size = 12345678 }, "<12345678 byte literal>" },
+		{ { .type = IMAP_ARG_LIST, ._data.list = list_root }, "((foo) \"bar\")" },
+	};
+	string_t *str = t_str_new(100);
+
+	test_begin("imap_write_arg");
+	for (unsigned int i = 0; i < N_ELEMENTS(tests); i++) {
+		str_truncate(str, 0);
+		imap_write_arg(str, &tests[i].input);
+		test_assert_idx(strcmp(str_c(str), tests[i].output) == 0, i);
+	}
+	test_end();
+}
+
+int main(void)
+{
+	static void (*const test_functions[])(void) = {
+		test_imap_parse_system_flag,
+		test_imap_write_arg,
+		NULL
+	};
+	return test_run(test_functions);
+}