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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 17:36:47 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 17:36:47 +0000
commit0441d265f2bb9da249c7abf333f0f771fadb4ab5 (patch)
tree3f3789daa2f6db22da6e55e92bee0062a7d613fe /src/pop3
parentInitial commit. (diff)
downloaddovecot-0441d265f2bb9da249c7abf333f0f771fadb4ab5.tar.xz
dovecot-0441d265f2bb9da249c7abf333f0f771fadb4ab5.zip
Adding upstream version 1:2.3.21+dfsg1.upstream/1%2.3.21+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/pop3')
-rw-r--r--src/pop3/Makefile.am39
-rw-r--r--src/pop3/Makefile.in887
-rw-r--r--src/pop3/main.c433
-rw-r--r--src/pop3/pop3-capability.h14
-rw-r--r--src/pop3/pop3-client.c869
-rw-r--r--src/pop3/pop3-client.h146
-rw-r--r--src/pop3/pop3-commands.c956
-rw-r--r--src/pop3/pop3-commands.h13
-rw-r--r--src/pop3/pop3-common.h27
-rw-r--r--src/pop3/pop3-settings.c184
-rw-r--r--src/pop3/pop3-settings.h40
11 files changed, 3608 insertions, 0 deletions
diff --git a/src/pop3/Makefile.am b/src/pop3/Makefile.am
new file mode 100644
index 0000000..fe49741
--- /dev/null
+++ b/src/pop3/Makefile.am
@@ -0,0 +1,39 @@
+pkglibexecdir = $(libexecdir)/dovecot
+
+pkglibexec_PROGRAMS = pop3
+
+AM_CPPFLAGS = \
+ -I$(top_srcdir)/src/lib \
+ -I$(top_srcdir)/src/lib-settings \
+ -I$(top_srcdir)/src/lib-master \
+ -I$(top_srcdir)/src/lib-dict \
+ -I$(top_srcdir)/src/lib-mail \
+ -I$(top_srcdir)/src/lib-index \
+ -I$(top_srcdir)/src/lib-storage \
+ $(BINARY_CFLAGS)
+
+pop3_LDFLAGS = -export-dynamic \
+ $(BINARY_LDFLAGS)
+
+pop3_LDADD = \
+ $(LIBDOVECOT_STORAGE) \
+ $(LIBDOVECOT)
+pop3_DEPENDENCIES = \
+ $(LIBDOVECOT_STORAGE_DEPS) \
+ $(LIBDOVECOT_DEPS)
+
+pop3_SOURCES = \
+ main.c \
+ pop3-client.c \
+ pop3-commands.c \
+ pop3-settings.c
+
+headers = \
+ pop3-capability.h \
+ pop3-client.h \
+ pop3-commands.h \
+ pop3-common.h \
+ pop3-settings.h
+
+pkginc_libdir=$(pkgincludedir)
+pkginc_lib_HEADERS = $(headers)
diff --git a/src/pop3/Makefile.in b/src/pop3/Makefile.in
new file mode 100644
index 0000000..18675a3
--- /dev/null
+++ b/src/pop3/Makefile.in
@@ -0,0 +1,887 @@
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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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+ $(BINARY_LDFLAGS)
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+
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+ $(LIBDOVECOT_DEPS)
+
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+ main.c \
+ pop3-client.c \
+ pop3-commands.c \
+ pop3-settings.c
+
+headers = \
+ pop3-capability.h \
+ pop3-client.h \
+ pop3-commands.h \
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+ pop3-settings.h
+
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+
+
+# 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/pop3/main.c b/src/pop3/main.c
new file mode 100644
index 0000000..c929cdb
--- /dev/null
+++ b/src/pop3/main.c
@@ -0,0 +1,433 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+#include "pop3-common.h"
+#include "ioloop.h"
+#include "buffer.h"
+#include "istream.h"
+#include "istream-concat.h"
+#include "ostream.h"
+#include "path-util.h"
+#include "base64.h"
+#include "str.h"
+#include "process-title.h"
+#include "restrict-access.h"
+#include "settings-parser.h"
+#include "master-service.h"
+#include "master-login.h"
+#include "master-interface.h"
+#include "var-expand.h"
+#include "mail-error.h"
+#include "mail-user.h"
+#include "mail-namespace.h"
+#include "mail-storage-service.h"
+
+#include <stdio.h>
+#include <unistd.h>
+
+#define IS_STANDALONE() \
+ (getenv(MASTER_IS_PARENT_ENV) == NULL)
+
+static bool verbose_proctitle = FALSE;
+static struct mail_storage_service_ctx *storage_service;
+static struct master_login *master_login = NULL;
+
+pop3_client_created_func_t *hook_client_created = NULL;
+
+pop3_client_created_func_t *
+pop3_client_created_hook_set(pop3_client_created_func_t *new_hook)
+{
+ pop3_client_created_func_t *old_hook = hook_client_created;
+
+ hook_client_created = new_hook;
+ return old_hook;
+}
+
+void pop3_refresh_proctitle(void)
+{
+ struct client *client;
+ string_t *title = t_str_new(128);
+
+ if (!verbose_proctitle)
+ return;
+
+ str_append_c(title, '[');
+ switch (pop3_client_count) {
+ case 0:
+ str_append(title, "idling");
+ break;
+ case 1:
+ client = pop3_clients;
+ str_append(title, client->user->username);
+ if (client->user->conn.remote_ip != NULL) {
+ str_append_c(title, ' ');
+ str_append(title,
+ net_ip2addr(client->user->conn.remote_ip));
+ }
+ if (client->destroyed)
+ str_append(title, " (deinit)");
+ break;
+ default:
+ str_printfa(title, "%u connections", pop3_client_count);
+ break;
+ }
+ str_append_c(title, ']');
+ process_title_set(str_c(title));
+}
+
+static void pop3_die(void)
+{
+ /* do nothing. pop3 connections typically die pretty quick anyway. */
+}
+
+static void client_add_input(struct client *client, const buffer_t *buf)
+{
+ struct ostream *output;
+
+ if (buf != NULL && buf->used > 0) {
+ struct istream *inputs[] = {
+ i_stream_create_copy_from_data(buf->data, buf->used),
+ client->input,
+ NULL
+ };
+ client->input = i_stream_create_concat(inputs);
+ i_stream_copy_fd(client->input, inputs[1]);
+ i_stream_unref(&inputs[0]);
+ i_stream_unref(&inputs[1]);
+ i_stream_set_input_pending(client->input, TRUE);
+ }
+
+ output = client->output;
+ o_stream_ref(output);
+ o_stream_cork(output);
+ (void)client_handle_input(client);
+ o_stream_uncork(output);
+ o_stream_unref(&output);
+}
+
+static int
+client_create_from_input(const struct mail_storage_service_input *input,
+ int fd_in, int fd_out, struct client **client_r,
+ const char **error_r)
+{
+ const char *lookup_error_str =
+ "-ERR [SYS/TEMP] "MAIL_ERRSTR_CRITICAL_MSG"\r\n";
+ struct mail_storage_service_user *user;
+ struct mail_user *mail_user;
+ struct pop3_settings *set;
+ const char *errstr;
+
+ if (mail_storage_service_lookup_next(storage_service, input,
+ &user, &mail_user, error_r) <= 0) {
+ if (write(fd_out, lookup_error_str, strlen(lookup_error_str)) < 0) {
+ /* ignored */
+ }
+ return -1;
+ }
+ restrict_access_allow_coredumps(TRUE);
+
+ set = mail_storage_service_user_get_set(user)[1];
+ if (set->verbose_proctitle)
+ verbose_proctitle = TRUE;
+
+ if (settings_var_expand(&pop3_setting_parser_info, set,
+ mail_user->pool, mail_user_var_expand_table(mail_user),
+ &errstr) <= 0) {
+ *error_r = t_strdup_printf("Failed to expand settings: %s", errstr);
+ mail_user_deinit(&mail_user);
+ mail_storage_service_user_unref(&user);
+ return -1;
+ }
+
+ *client_r = client_create(fd_in, fd_out, mail_user, user, set);
+ return 0;
+}
+
+static int lock_session(struct client *client)
+{
+ int ret;
+
+ i_assert(client->user->namespaces != NULL);
+ i_assert(client->set->pop3_lock_session);
+
+ if ((ret = pop3_lock_session(client)) <= 0) {
+ client_send_line(client, ret < 0 ?
+ "-ERR [SYS/TEMP] Failed to create POP3 session lock." :
+ "-ERR [IN-USE] Mailbox is locked by another POP3 session.");
+ client_destroy(client, "Couldn't lock POP3 session");
+ return -1;
+ }
+
+ return 0;
+}
+
+#define MSG_BYE_INTERNAL_ERROR "-ERR "MAIL_ERRSTR_CRITICAL_MSG
+static int init_namespaces(struct client *client, bool already_logged_in)
+{
+ const char *error;
+
+ /* finish initializing the user (see comment in main()) */
+ if (mail_namespaces_init(client->user, &error) < 0) {
+ if (!already_logged_in)
+ client_send_line(client, MSG_BYE_INTERNAL_ERROR);
+
+ i_error("%s", error);
+ client_destroy(client, error);
+ return -1;
+ }
+
+ i_assert(client->inbox_ns == NULL);
+ client->inbox_ns = mail_namespace_find_inbox(client->user->namespaces);
+ i_assert(client->inbox_ns != NULL);
+
+ return 0;
+}
+
+static void client_init_session(struct client *client)
+{
+ const char *error;
+
+ /*
+ * RFC 1939 requires that the session lock gets acquired before the
+ * positive response is sent to the client indicating a transition
+ * to the TRANSACTION state.
+ *
+ * Since the session lock is stored under the INBOX's storage
+ * directory, the locking code requires that the namespaces are
+ * initialized first.
+ *
+ * If the system administrator configured dovecot to not use session
+ * locks, we can send back the positive response before the
+ * potentially long-running namespace initialization occurs. This
+ * avoids the client possibly timing out during authentication due
+ * to storage initialization taking too long.
+ */
+ if (client->set->pop3_lock_session) {
+ if (init_namespaces(client, FALSE) < 0)
+ return; /* no need to propagate an error */
+
+ if (lock_session(client) < 0)
+ return; /* no need to propagate an error */
+
+ if (!IS_STANDALONE())
+ client_send_line(client, "+OK Logged in.");
+ } else {
+ if (!IS_STANDALONE())
+ client_send_line(client, "+OK Logged in.");
+
+ if (init_namespaces(client, TRUE) < 0)
+ return; /* no need to propagate an error */
+ }
+
+ struct event_reason *reason = event_reason_begin("pop3:initialize");
+ int ret = client_init_mailbox(client, &error);
+ event_reason_end(&reason);
+
+ if (ret < 0) {
+ i_error("%s", error);
+ client_destroy(client, error);
+ }
+}
+
+static void main_stdio_run(const char *username)
+{
+ struct client *client;
+ struct mail_storage_service_input input;
+ buffer_t *input_buf;
+ const char *value, *error, *input_base64;
+
+ i_zero(&input);
+ input.module = input.service = "pop3";
+ input.username = username != NULL ? username : getenv("USER");
+ if (input.username == NULL && IS_STANDALONE())
+ input.username = getlogin();
+ if (input.username == NULL)
+ i_fatal("USER environment missing");
+ if ((value = getenv("IP")) != NULL)
+ (void)net_addr2ip(value, &input.remote_ip);
+ if ((value = getenv("LOCAL_IP")) != NULL)
+ (void)net_addr2ip(value, &input.local_ip);
+
+ input_base64 = getenv("CLIENT_INPUT");
+ input_buf = input_base64 == NULL ? NULL :
+ t_base64_decode_str(input_base64);
+
+ if (client_create_from_input(&input, STDIN_FILENO, STDOUT_FILENO,
+ &client, &error) < 0)
+ i_fatal("%s", error);
+ client_add_input(client, input_buf);
+ client_create_finish(client);
+
+ client_init_session(client);
+ /* client may be destroyed now */
+}
+
+static void
+login_client_connected(const struct master_login_client *login_client,
+ const char *username, const char *const *extra_fields)
+{
+ struct client *client;
+ struct mail_storage_service_input input;
+ enum mail_auth_request_flags flags = login_client->auth_req.flags;
+ const char *error;
+ buffer_t input_buf;
+
+ i_zero(&input);
+ input.module = input.service = "pop3";
+ input.local_ip = login_client->auth_req.local_ip;
+ input.remote_ip = login_client->auth_req.remote_ip;
+ input.local_port = login_client->auth_req.local_port;
+ input.remote_port = login_client->auth_req.remote_port;
+ input.username = username;
+ input.userdb_fields = extra_fields;
+ input.session_id = login_client->session_id;
+ if ((flags & MAIL_AUTH_REQUEST_FLAG_CONN_SECURED) != 0)
+ input.conn_secured = TRUE;
+ if ((flags & MAIL_AUTH_REQUEST_FLAG_CONN_SSL_SECURED) != 0)
+ input.conn_ssl_secured = TRUE;
+
+ buffer_create_from_const_data(&input_buf, login_client->data,
+ login_client->auth_req.data_size);
+ if (client_create_from_input(&input, login_client->fd, login_client->fd,
+ &client, &error) < 0) {
+ int fd = login_client->fd;
+
+ i_error("%s", error);
+ i_close_fd(&fd);
+ master_service_client_connection_destroyed(master_service);
+ return;
+ }
+ client_add_input(client, &input_buf);
+ client_create_finish(client);
+
+ client_init_session(client);
+ /* client may be destroyed now */
+}
+
+static void login_client_failed(const struct master_login_client *client,
+ const char *errormsg)
+{
+ const char *msg;
+
+ msg = t_strdup_printf("-ERR [SYS/TEMP] %s\r\n", errormsg);
+ if (write(client->fd, msg, strlen(msg)) < 0) {
+ /* ignored */
+ }
+}
+
+static void client_connected(struct master_service_connection *conn)
+{
+ /* when running standalone, we shouldn't even get here */
+ i_assert(master_login != NULL);
+
+ master_service_client_connection_accept(conn);
+ master_login_add(master_login, conn->fd);
+}
+
+int main(int argc, char *argv[])
+{
+ static const struct setting_parser_info *set_roots[] = {
+ &pop3_setting_parser_info,
+ NULL
+ };
+ struct master_login_settings login_set;
+ enum master_service_flags service_flags = 0;
+ enum mail_storage_service_flags storage_service_flags =
+ MAIL_STORAGE_SERVICE_FLAG_NO_SSL_CA;
+ const char *username = NULL, *auth_socket_path = "auth-master";
+ int c;
+
+ i_zero(&login_set);
+ login_set.postlogin_timeout_secs = MASTER_POSTLOGIN_TIMEOUT_DEFAULT;
+
+ if (IS_STANDALONE() && getuid() == 0 &&
+ net_getpeername(1, NULL, NULL) == 0) {
+ printf("-ERR [SYS/PERM] pop3 binary must not be started from "
+ "inetd, use pop3-login instead.\n");
+ return 1;
+ }
+
+ if (IS_STANDALONE()) {
+ service_flags |= MASTER_SERVICE_FLAG_STANDALONE |
+ MASTER_SERVICE_FLAG_STD_CLIENT;
+ } else {
+ service_flags |= MASTER_SERVICE_FLAG_KEEP_CONFIG_OPEN;
+ }
+
+ /*
+ * We include MAIL_STORAGE_SERVICE_FLAG_NO_NAMESPACES so that the
+ * mail_user initialization is fast and we can quickly send back the
+ * OK response to LOGIN/AUTHENTICATE. Otherwise we risk a very slow
+ * namespace initialization to cause client timeouts on login.
+ */
+ storage_service_flags |= MAIL_STORAGE_SERVICE_FLAG_NO_NAMESPACES;
+
+ master_service = master_service_init("pop3", service_flags,
+ &argc, &argv, "a:t:u:");
+ while ((c = master_getopt(master_service)) > 0) {
+ switch (c) {
+ case 'a':
+ auth_socket_path = optarg;
+ break;
+ case 't':
+ if (str_to_uint(optarg, &login_set.postlogin_timeout_secs) < 0 ||
+ login_set.postlogin_timeout_secs == 0)
+ i_fatal("Invalid -t parameter: %s", optarg);
+ break;
+ case 'u':
+ storage_service_flags |=
+ MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP;
+ username = optarg;
+ break;
+ default:
+ return FATAL_DEFAULT;
+ }
+ }
+
+ const char *error;
+ if (t_abspath(auth_socket_path, &login_set.auth_socket_path, &error) < 0) {
+ i_fatal("t_abspath(%s) failed: %s", auth_socket_path, error);
+ }
+ if (argv[optind] != NULL) {
+ if (t_abspath(argv[optind], &login_set.postlogin_socket_path, &error) < 0) {
+ i_fatal("t_abspath(%s) failed: %s", argv[optind], error);
+ }
+ }
+ login_set.callback = login_client_connected;
+ login_set.failure_callback = login_client_failed;
+ login_set.update_proctitle =
+ getenv(MASTER_VERBOSE_PROCTITLE_ENV) != NULL &&
+ master_service_get_client_limit(master_service) == 1;
+ if (!IS_STANDALONE())
+ master_login = master_login_init(master_service, &login_set);
+
+ master_service_set_die_callback(master_service, pop3_die);
+
+ storage_service =
+ mail_storage_service_init(master_service,
+ set_roots, storage_service_flags);
+ master_service_init_finish(master_service);
+ /* NOTE: login_set.*_socket_path are now invalid due to data stack
+ having been freed */
+
+ /* fake that we're running, so we know if client was destroyed
+ while handling its initial input */
+ io_loop_set_running(current_ioloop);
+
+ if (IS_STANDALONE()) {
+ T_BEGIN {
+ main_stdio_run(username);
+ } T_END;
+ } else {
+ io_loop_set_running(current_ioloop);
+ }
+
+ if (io_loop_is_running(current_ioloop))
+ master_service_run(master_service, client_connected);
+ clients_destroy_all();
+
+ if (master_login != NULL)
+ master_login_deinit(&master_login);
+ mail_storage_service_deinit(&storage_service);
+ master_service_deinit(&master_service);
+ return 0;
+}
diff --git a/src/pop3/pop3-capability.h b/src/pop3/pop3-capability.h
new file mode 100644
index 0000000..3cd48ce
--- /dev/null
+++ b/src/pop3/pop3-capability.h
@@ -0,0 +1,14 @@
+#ifndef POP3_CAPABILITY_H
+#define POP3_CAPABILITY_H
+
+#define POP3_CAPABILITY_REPLY \
+ "CAPA\r\n" \
+ "TOP\r\n" \
+ "UIDL\r\n" \
+ "RESP-CODES\r\n" \
+ "PIPELINING\r\n" \
+ "AUTH-RESP-CODE\r\n"
+
+/* + SASL */
+
+#endif
diff --git a/src/pop3/pop3-client.c b/src/pop3/pop3-client.c
new file mode 100644
index 0000000..4bdbea2
--- /dev/null
+++ b/src/pop3/pop3-client.c
@@ -0,0 +1,869 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+#include "pop3-common.h"
+#include "array.h"
+#include "ioloop.h"
+#include "net.h"
+#include "iostream.h"
+#include "istream.h"
+#include "ostream.h"
+#include "iostream-rawlog.h"
+#include "crc32.h"
+#include "str.h"
+#include "llist.h"
+#include "hostpid.h"
+#include "file-dotlock.h"
+#include "var-expand.h"
+#include "master-service.h"
+#include "mail-storage.h"
+#include "mail-storage-service.h"
+#include "mail-autoexpunge.h"
+#include "pop3-commands.h"
+#include "mail-search-build.h"
+#include "mail-namespace.h"
+
+#include <unistd.h>
+
+/* max. length of input command line (spec says 512) */
+#define MAX_INBUF_SIZE 2048
+
+/* Disconnect client when it sends too many bad commands in a row */
+#define CLIENT_MAX_BAD_COMMANDS 20
+
+/* Disconnect client after idling this many milliseconds */
+#define CLIENT_IDLE_TIMEOUT_MSECS (10*60*1000)
+/* If client starts idling for this many milliseconds, commit the current
+ transaction. This allows the mailbox to become unlocked. */
+#define CLIENT_COMMIT_TIMEOUT_MSECS (10*1000)
+
+#define POP3_LOCK_FNAME "dovecot-pop3-session.lock"
+#define POP3_SESSION_DOTLOCK_STALE_TIMEOUT_SECS (60*5)
+
+extern struct pop3_client_vfuncs pop3_client_vfuncs;
+
+struct pop3_module_register pop3_module_register = { 0 };
+
+struct client *pop3_clients;
+unsigned int pop3_client_count;
+
+static enum mail_sort_type pop3_sort_program[] = {
+ MAIL_SORT_POP3_ORDER,
+ MAIL_SORT_END
+};
+
+static const struct dotlock_settings session_dotlock_set = {
+ .timeout = 10,
+ .stale_timeout = POP3_SESSION_DOTLOCK_STALE_TIMEOUT_SECS,
+ .lock_suffix = "",
+ .use_io_notify = TRUE
+};
+
+static void client_input(struct client *client);
+static int client_output(struct client *client);
+
+static void client_commit_timeout(struct client *client)
+{
+ if (client->cmd != NULL) {
+ /* Can't commit while commands are running */
+ return;
+ }
+
+ (void)mailbox_transaction_commit(&client->trans);
+ client->trans = mailbox_transaction_begin(client->mailbox, 0, __func__);
+}
+
+static void client_idle_timeout(struct client *client)
+{
+ if (client->cmd != NULL) {
+ client_destroy(client, t_strdup_printf(
+ "Client has not read server output for for %"PRIdTIME_T" secs",
+ ioloop_time - client->last_output));
+ } else {
+ client_send_line(client, "-ERR Disconnected for inactivity.");
+ client_destroy(client, t_strdup_printf(
+ "Inactivity - no input for %"PRIdTIME_T" secs",
+ ioloop_time - client->last_input));
+ }
+}
+
+static int
+pop3_mail_get_size(struct client *client, struct mail *mail, uoff_t *size_r)
+{
+ int ret;
+
+ if (!client->set->pop3_fast_size_lookups)
+ return mail_get_virtual_size(mail, size_r);
+
+ /* first try to get the virtual size */
+ mail->lookup_abort = MAIL_LOOKUP_ABORT_READ_MAIL;
+ ret = mail_get_virtual_size(mail, size_r);
+ mail->lookup_abort = MAIL_LOOKUP_ABORT_NEVER;
+ if (ret == 0)
+ return 0;
+
+ if (mailbox_get_last_mail_error(mail->box) != MAIL_ERROR_LOOKUP_ABORTED)
+ return -1;
+
+ /* virtual size not available with a fast lookup.
+ fallback to trying the physical size */
+ mail->lookup_abort = MAIL_LOOKUP_ABORT_READ_MAIL;
+ ret = mail_get_physical_size(mail, size_r);
+ mail->lookup_abort = MAIL_LOOKUP_ABORT_NEVER;
+ if (ret == 0)
+ return 0;
+
+ if (mailbox_get_last_mail_error(mail->box) != MAIL_ERROR_LOOKUP_ABORTED)
+ return -1;
+
+ /* no way to quickly get the size. fallback to doing a slow virtual
+ size lookup */
+ return mail_get_virtual_size(mail, size_r);
+}
+
+static void
+msgnum_to_seq_map_add(ARRAY_TYPE(uint32_t) *msgnum_to_seq_map,
+ struct client *client, struct mail *mail,
+ unsigned int msgnum)
+{
+ uint32_t seq;
+
+ if (mail->seq == msgnum+1)
+ return;
+
+ if (!array_is_created(msgnum_to_seq_map))
+ i_array_init(msgnum_to_seq_map, client->messages_count);
+
+ /* add any messages between this and the previous one that had
+ a POP3 order defined */
+ seq = array_count(msgnum_to_seq_map) + 1;
+ for (; seq <= msgnum; seq++)
+ array_push_back(msgnum_to_seq_map, &seq);
+ array_push_back(msgnum_to_seq_map, &mail->seq);
+}
+
+static int read_mailbox(struct client *client, uint32_t *failed_uid_r)
+{
+ struct mailbox_status status;
+ struct mailbox_transaction_context *t;
+ struct mail_search_args *search_args;
+ struct mail_search_arg *sarg;
+ struct mail_search_context *ctx;
+ struct mail *mail;
+ uoff_t size;
+ ARRAY(uoff_t) message_sizes;
+ ARRAY_TYPE(uint32_t) msgnum_to_seq_map = ARRAY_INIT;
+ unsigned int msgnum;
+ int ret = 1;
+
+ *failed_uid_r = 0;
+
+ mailbox_get_open_status(client->mailbox, STATUS_UIDVALIDITY, &status);
+ client->uid_validity = status.uidvalidity;
+ client->messages_count = status.messages;
+
+ t = mailbox_transaction_begin(client->mailbox, 0, __func__);
+
+ search_args = mail_search_build_init();
+ if (client->deleted_kw != NULL) {
+ sarg = mail_search_build_add(search_args, SEARCH_KEYWORDS);
+ sarg->match_not = TRUE;
+ sarg->value.str = p_strdup(search_args->pool,
+ client->set->pop3_deleted_flag);
+ i_array_init(&client->all_seqs, 32);
+ } else {
+ mail_search_build_add_all(search_args);
+ }
+ mail_search_args_init(search_args, client->mailbox, TRUE, NULL);
+
+ ctx = mailbox_search_init(t, search_args, pop3_sort_program,
+ client->set->pop3_fast_size_lookups ? 0 :
+ MAIL_FETCH_VIRTUAL_SIZE, NULL);
+ mail_search_args_unref(&search_args);
+
+ client->last_seen_pop3_msn = 0;
+ client->total_size = 0;
+ i_array_init(&message_sizes, client->messages_count);
+
+ msgnum = 0;
+ while (mailbox_search_next(ctx, &mail)) {
+ if (pop3_mail_get_size(client, mail, &size) < 0) {
+ ret = mail->expunged ? 0 : -1;
+ *failed_uid_r = mail->uid;
+ break;
+ }
+ if (array_is_created(&client->all_seqs))
+ seq_range_array_add(&client->all_seqs, mail->seq);
+ msgnum_to_seq_map_add(&msgnum_to_seq_map, client, mail, msgnum);
+
+ if ((mail_get_flags(mail) & MAIL_SEEN) != 0)
+ client->last_seen_pop3_msn = msgnum + 1;
+ client->total_size += size;
+ if (client->highest_seq < mail->seq)
+ client->highest_seq = mail->seq;
+
+ array_push_back(&message_sizes, &size);
+ msgnum++;
+ }
+
+ if (mailbox_search_deinit(&ctx) < 0)
+ ret = -1;
+
+ if (ret <= 0) {
+ /* commit the transaction instead of rolling back to make sure
+ we don't lose data (virtual sizes) added to cache file */
+ (void)mailbox_transaction_commit(&t);
+ array_free(&message_sizes);
+ if (array_is_created(&msgnum_to_seq_map))
+ array_free(&msgnum_to_seq_map);
+ return ret;
+ }
+ i_assert(msgnum <= client->messages_count);
+ client->messages_count = msgnum;
+
+ if (!array_is_created(&client->all_seqs)) {
+ i_array_init(&client->all_seqs, 1);
+ seq_range_array_add_range(&client->all_seqs, 1, msgnum);
+ }
+
+ client->trans = t;
+ client->message_sizes =
+ array_free_without_data(&message_sizes);
+ if (array_is_created(&msgnum_to_seq_map)) {
+ client->msgnum_to_seq_map_count =
+ array_count(&msgnum_to_seq_map);
+ client->msgnum_to_seq_map =
+ array_free_without_data(&msgnum_to_seq_map);
+ }
+ return 1;
+}
+
+static int init_pop3_deleted_flag(struct client *client, const char **error_r)
+{
+ const char *deleted_keywords[2];
+
+ if (client->set->pop3_deleted_flag[0] == '\0')
+ return 0;
+
+ deleted_keywords[0] = client->set->pop3_deleted_flag;
+ deleted_keywords[1] = NULL;
+ if (mailbox_keywords_create(client->mailbox, deleted_keywords,
+ &client->deleted_kw) < 0) {
+ *error_r = t_strdup_printf(
+ "pop3_deleted_flags: Invalid keyword '%s': %s",
+ client->set->pop3_deleted_flag,
+ mailbox_get_last_internal_error(client->mailbox, NULL));
+ return -1;
+ }
+ return 0;
+}
+
+static int init_mailbox(struct client *client, const char **error_r)
+{
+ uint32_t failed_uid = 0, last_failed_uid = 0;
+ int i, ret = -1;
+
+ for (i = 0;; i++) {
+ if (mailbox_sync(client->mailbox,
+ MAILBOX_SYNC_FLAG_FULL_READ) < 0) {
+ ret = -1;
+ break;
+ }
+
+ ret = read_mailbox(client, &failed_uid);
+ if (ret > 0)
+ return 0;
+ if (i == 2)
+ break;
+
+ /* well, sync and try again. maybe it works the second time. */
+ last_failed_uid = failed_uid;
+ failed_uid = 0;
+ }
+
+ if (ret < 0) {
+ *error_r = mailbox_get_last_internal_error(client->mailbox, NULL);
+ client_send_storage_error(client);
+ } else {
+ if (failed_uid == last_failed_uid && failed_uid != 0) {
+ /* failed twice in same message */
+ *error_r = t_strdup_printf(
+ "Getting size of message UID=%u failed",
+ failed_uid);
+ } else {
+ *error_r = "Can't sync mailbox: "
+ "Messages keep getting expunged";
+ }
+ client_send_line(client, "-ERR [SYS/TEMP] Couldn't sync mailbox.");
+ }
+ return -1;
+}
+
+static enum uidl_keys parse_uidl_keymask(const char *format)
+{
+ enum uidl_keys mask = 0;
+
+ for (; *format != '\0'; format++) {
+ if (format[0] == '%' && format[1] != '\0') {
+ switch (var_get_key(++format)) {
+ case 'v':
+ mask |= UIDL_UIDVALIDITY;
+ break;
+ case 'u':
+ mask |= UIDL_UID;
+ break;
+ case 'm':
+ mask |= UIDL_MD5;
+ break;
+ case 'f':
+ mask |= UIDL_FILE_NAME;
+ break;
+ case 'g':
+ mask |= UIDL_GUID;
+ break;
+ }
+ }
+ }
+ return mask;
+}
+
+static void pop3_lock_session_refresh(struct client *client)
+{
+ if (file_dotlock_touch(client->session_dotlock) < 0) {
+ client_send_line(client,
+ "-ERR [SYS/TEMP] Couldn't update POP3 session lock.");
+ client_destroy(client, "Couldn't lock POP3 session");
+ }
+}
+
+int pop3_lock_session(struct client *client)
+{
+ const struct mail_storage_settings *mail_set =
+ mail_storage_service_user_get_mail_set(client->service_user);
+ struct dotlock_settings dotlock_set;
+ enum mailbox_list_path_type type;
+ const char *dir, *path;
+ int ret;
+
+ if (mailbox_list_get_root_path(client->inbox_ns->list,
+ MAILBOX_LIST_PATH_TYPE_INDEX, &dir)) {
+ type = MAILBOX_LIST_PATH_TYPE_INDEX;
+ } else if (mailbox_list_get_root_path(client->inbox_ns->list,
+ MAILBOX_LIST_PATH_TYPE_DIR, &dir)) {
+ type = MAILBOX_LIST_PATH_TYPE_DIR;
+ } else {
+ i_error("pop3_lock_session: Storage has no root/index directory, "
+ "can't create a POP3 session lock file");
+ return -1;
+ }
+ if (mailbox_list_mkdir_root(client->inbox_ns->list, dir, type) < 0) {
+ i_error("pop3_lock_session: Couldn't create root directory %s: %s",
+ dir, mailbox_list_get_last_internal_error(client->inbox_ns->list, NULL));
+ return -1;
+ }
+ path = t_strdup_printf("%s/"POP3_LOCK_FNAME, dir);
+
+ dotlock_set = session_dotlock_set;
+ dotlock_set.use_excl_lock = mail_set->dotlock_use_excl;
+ dotlock_set.nfs_flush = mail_set->mail_nfs_storage;
+
+ ret = file_dotlock_create(&dotlock_set, path, 0,
+ &client->session_dotlock);
+ if (ret < 0)
+ i_error("file_dotlock_create(%s) failed: %m", path);
+ else if (ret > 0) {
+ client->to_session_dotlock_refresh =
+ timeout_add(POP3_SESSION_DOTLOCK_STALE_TIMEOUT_SECS*1000,
+ pop3_lock_session_refresh, client);
+ }
+ return ret;
+}
+
+struct client *client_create(int fd_in, int fd_out,
+ struct mail_user *user,
+ struct mail_storage_service_user *service_user,
+ const struct pop3_settings *set)
+{
+ struct client *client;
+ pool_t pool;
+
+ /* always use nonblocking I/O */
+ net_set_nonblock(fd_in, TRUE);
+ net_set_nonblock(fd_out, TRUE);
+
+ pool = pool_alloconly_create("pop3 client", 256);
+ client = p_new(pool, struct client, 1);
+ client->pool = pool;
+ client->service_user = service_user;
+ client->v = pop3_client_vfuncs;
+ client->set = set;
+ client->fd_in = fd_in;
+ client->fd_out = fd_out;
+ client->input = i_stream_create_fd(fd_in, MAX_INBUF_SIZE);
+ client->output = o_stream_create_fd(fd_out, SIZE_MAX);
+ o_stream_set_no_error_handling(client->output, TRUE);
+ o_stream_set_flush_callback(client->output, client_output, client);
+
+ p_array_init(&client->module_contexts, client->pool, 5);
+ client->last_input = ioloop_time;
+ client->to_idle = timeout_add(CLIENT_IDLE_TIMEOUT_MSECS,
+ client_idle_timeout, client);
+ client->to_commit = timeout_add(CLIENT_COMMIT_TIMEOUT_MSECS,
+ client_commit_timeout, client);
+
+ client->user = user;
+
+ client->mail_set = mail_user_set_get_storage_set(user);
+ client->uidl_keymask =
+ parse_uidl_keymask(client->mail_set->pop3_uidl_format);
+ if (client->uidl_keymask == 0)
+ i_fatal("Invalid pop3_uidl_format");
+
+ if (var_has_key(set->pop3_logout_format, 'u', "uidl_change")) {
+ /* logging uidl_change. we need hashes of the UIDLs */
+ client->message_uidls_save = TRUE;
+ } else if (strcmp(set->pop3_uidl_duplicates, "allow") != 0) {
+ /* UIDL duplicates aren't allowed, so we'll need to
+ keep track of them */
+ client->message_uidls_save = TRUE;
+ }
+
+ pop3_client_count++;
+ DLLIST_PREPEND(&pop3_clients, client);
+
+ if (hook_client_created != NULL)
+ hook_client_created(&client);
+
+ return client;
+}
+
+void client_create_finish(struct client *client)
+{
+ if (client->set->rawlog_dir[0] != '\0') {
+ (void)iostream_rawlog_create(client->set->rawlog_dir,
+ &client->input, &client->output);
+ }
+ client->io = io_add_istream(client->input, client_input, client);
+}
+
+int client_init_mailbox(struct client *client, const char **error_r)
+{
+ enum mailbox_flags flags;
+ const char *ident, *errmsg;
+
+ /* refresh proctitle before a potentially long-running init_mailbox() */
+ pop3_refresh_proctitle();
+
+ flags = MAILBOX_FLAG_POP3_SESSION;
+ if (!client->set->pop3_no_flag_updates)
+ flags |= MAILBOX_FLAG_DROP_RECENT;
+ client->mailbox = mailbox_alloc(client->inbox_ns->list, "INBOX", flags);
+ if (mailbox_open(client->mailbox) < 0) {
+ *error_r = t_strdup_printf("Couldn't open INBOX: %s",
+ mailbox_get_last_internal_error(client->mailbox, NULL));
+ client_send_storage_error(client);
+ return -1;
+ }
+
+ if (init_pop3_deleted_flag(client, &errmsg) < 0 ||
+ init_mailbox(client, &errmsg) < 0) {
+ *error_r = t_strdup_printf("Couldn't init INBOX: %s", errmsg);
+ return -1;
+ }
+
+ if (!client->set->pop3_no_flag_updates && client->messages_count > 0)
+ client->seen_bitmask = i_malloc(MSGS_BITMASK_SIZE(client));
+
+ ident = mail_user_get_anvil_userip_ident(client->user);
+ if (ident != NULL) {
+ master_service_anvil_send(master_service, t_strconcat(
+ "CONNECT\t", my_pid, "\tpop3/", ident, "\n", NULL));
+ client->anvil_sent = TRUE;
+ }
+ return 0;
+}
+
+static const char *client_build_uidl_change_string(struct client *client)
+{
+ uint32_t i, old_hash, new_hash;
+ unsigned int old_msg_count, new_msg_count;
+
+ if (client->message_uidls == NULL) {
+ /* UIDL command not given */
+ return "";
+ }
+
+ /* 1..new-1 were probably left to mailbox by previous POP3 session */
+ old_msg_count = client->lowest_retr_pop3_msn > 0 ?
+ client->lowest_retr_pop3_msn - 1 : client->messages_count;
+ for (i = 0, old_hash = 0; i < old_msg_count; i++)
+ old_hash ^= crc32_str(client->message_uidls[i]);
+
+ /* assume all except deleted messages were sent to POP3 client */
+ if (!client->deleted) {
+ for (i = 0, new_hash = 0; i < client->messages_count; i++)
+ new_hash ^= crc32_str(client->message_uidls[i]);
+ } else {
+ for (i = 0, new_hash = 0; i < client->messages_count; i++) {
+ if ((client->deleted_bitmask[i / CHAR_BIT] &
+ (1 << (i % CHAR_BIT))) != 0)
+ continue;
+ new_hash ^= crc32_str(client->message_uidls[i]);
+ }
+ }
+
+ new_msg_count = client->messages_count - client->deleted_count;
+ if (old_hash == new_hash && old_msg_count == new_msg_count)
+ return t_strdup_printf("%u/%08x", old_msg_count, old_hash);
+ else {
+ return t_strdup_printf("%u/%08x -> %u/%08x",
+ old_msg_count, old_hash,
+ new_msg_count, new_hash);
+ }
+}
+
+static const char *client_stats(struct client *client)
+{
+ const char *uidl_change = "";
+ if (var_has_key(client->set->pop3_logout_format,
+ 'o', "uidl_change"))
+ uidl_change = client_build_uidl_change_string(client);
+
+ const struct var_expand_table logout_tab[] = {
+ { 'p', dec2str(client->top_bytes), "top_bytes" },
+ { 't', dec2str(client->top_count), "top_count" },
+ { 'b', dec2str(client->retr_bytes), "retr_bytes" },
+ { 'r', dec2str(client->retr_count), "retr_count" },
+ { 'd', !client->delete_success ? "0" :
+ dec2str(client->deleted_count), "deleted_count" },
+ { 'm', dec2str(client->messages_count), "message_count" },
+ { 's', dec2str(client->total_size), "message_bytes" },
+ { 'i', dec2str(client->input->v_offset), "input" },
+ { 'o', dec2str(client->output->offset), "output" },
+ { 'u', uidl_change, "uidl_change" },
+ { '\0', !client->delete_success ? "0" :
+ dec2str(client->deleted_size), "deleted_bytes" },
+ { '\0', NULL, NULL }
+ };
+ const struct var_expand_table *user_tab =
+ mail_user_var_expand_table(client->user);
+ const struct var_expand_table *tab =
+ t_var_expand_merge_tables(logout_tab, user_tab);
+ string_t *str;
+ const char *error;
+
+ str = t_str_new(128);
+ if (var_expand_with_funcs(str, client->set->pop3_logout_format,
+ tab, mail_user_var_expand_func_table,
+ client->user, &error) < 0) {
+ i_error("Failed to expand pop3_logout_format=%s: %s",
+ client->set->pop3_logout_format, error);
+ }
+ return str_c(str);
+}
+
+void client_destroy(struct client *client, const char *reason)
+{
+ client->v.destroy(client, reason);
+}
+
+static void client_default_destroy(struct client *client, const char *reason)
+{
+ i_assert(!client->destroyed);
+
+ client->destroyed = TRUE;
+
+ if (client->seen_change_count > 0)
+ (void)client_update_mails(client);
+
+ if (!client->disconnected) {
+ if (reason == NULL) {
+ reason = io_stream_get_disconnect_reason(client->input,
+ client->output);
+ }
+ i_info("Disconnected: %s %s", reason, client_stats(client));
+ }
+
+ if (client->cmd != NULL) {
+ /* deinitialize command */
+ i_stream_close(client->input);
+ o_stream_close(client->output);
+ client->cmd(client);
+ i_assert(client->cmd == NULL);
+ }
+
+ if (client->trans != NULL) {
+ /* client didn't QUIT, but we still want to save any changes
+ done in this transaction. especially the cached virtual
+ message sizes. */
+ (void)mailbox_transaction_commit(&client->trans);
+ }
+ if (array_is_created(&client->all_seqs))
+ array_free(&client->all_seqs);
+ if (client->deleted_kw != NULL)
+ mailbox_keywords_unref(&client->deleted_kw);
+ if (client->mailbox != NULL)
+ mailbox_free(&client->mailbox);
+ if (client->anvil_sent) {
+ master_service_anvil_send(master_service, t_strconcat(
+ "DISCONNECT\t", my_pid, "\tpop3/",
+ mail_user_get_anvil_userip_ident(client->user),
+ "\n", NULL));
+ }
+
+ if (client->session_dotlock != NULL)
+ file_dotlock_delete(&client->session_dotlock);
+ timeout_remove(&client->to_session_dotlock_refresh);
+
+ pool_unref(&client->uidl_pool);
+ i_free(client->message_sizes);
+ i_free(client->deleted_bitmask);
+ i_free(client->seen_bitmask);
+ i_free(client->msgnum_to_seq_map);
+
+ io_remove(&client->io);
+ timeout_remove(&client->to_idle);
+ timeout_remove(&client->to_commit);
+
+ i_stream_destroy(&client->input);
+ o_stream_destroy(&client->output);
+
+ fd_close_maybe_stdio(&client->fd_in, &client->fd_out);
+
+ /* Autoexpunging might run for a long time. Disconnect the client
+ before it starts, and refresh proctitle so it's clear that it's
+ doing autoexpunging. We've also sent DISCONNECT to anvil already,
+ because this is background work and shouldn't really be counted
+ as an active POP3 session for the user. */
+ pop3_refresh_proctitle();
+ mail_user_autoexpunge(client->user);
+ mail_user_deinit(&client->user);
+ mail_storage_service_user_unref(&client->service_user);
+
+ pop3_client_count--;
+ DLLIST_REMOVE(&pop3_clients, client);
+ pool_unref(&client->pool);
+
+ master_service_client_connection_destroyed(master_service);
+ pop3_refresh_proctitle();
+}
+
+static void client_destroy_timeout(struct client *client)
+{
+ client_destroy(client, NULL);
+}
+
+void client_disconnect(struct client *client, const char *reason)
+{
+ if (client->disconnected)
+ return;
+
+ client->disconnected = TRUE;
+ i_info("Disconnected: %s %s", reason, client_stats(client));
+
+ (void)o_stream_flush(client->output);
+
+ i_stream_close(client->input);
+ o_stream_close(client->output);
+
+ timeout_remove(&client->to_idle);
+ client->to_idle = timeout_add(0, client_destroy_timeout, client);
+}
+
+void client_send_line(struct client *client, const char *fmt, ...)
+{
+ va_list va;
+ ssize_t ret;
+
+ if (client->output->closed)
+ return;
+
+ va_start(va, fmt);
+
+ T_BEGIN {
+ string_t *str;
+
+ str = t_str_new(256);
+ str_vprintfa(str, fmt, va);
+ str_append(str, "\r\n");
+
+ ret = o_stream_send(client->output,
+ str_data(str), str_len(str));
+ i_assert(ret < 0 || (size_t)ret == str_len(str));
+ } T_END;
+ if (ret >= 0) {
+ if (!POP3_CLIENT_OUTPUT_FULL(client))
+ client->last_output = ioloop_time;
+ else if (client->io != NULL) {
+ /* no more input until client has read
+ our output */
+ io_remove(&client->io);
+
+ /* If someone happens to flush output, we want to get
+ our IO handler back in flush callback */
+ o_stream_set_flush_pending(client->output, TRUE);
+ }
+ }
+ va_end(va);
+}
+
+void client_send_storage_error(struct client *client)
+{
+ const char *errstr;
+ enum mail_error error;
+
+ if (mailbox_is_inconsistent(client->mailbox)) {
+ client_send_line(client, "-ERR [SYS/TEMP] Mailbox is in inconsistent "
+ "state, please relogin.");
+ client_disconnect(client, "Mailbox is in inconsistent state.");
+ return;
+ }
+
+ errstr = mailbox_get_last_error(client->mailbox, &error);
+ switch (error) {
+ case MAIL_ERROR_TEMP:
+ case MAIL_ERROR_NOQUOTA:
+ case MAIL_ERROR_INUSE:
+ client_send_line(client, "-ERR [SYS/TEMP] %s", errstr);
+ break;
+ default:
+ client_send_line(client, "-ERR [SYS/PERM] %s", errstr);
+ break;
+ }
+}
+
+bool client_handle_input(struct client *client)
+{
+ char *line, *args;
+ int ret;
+
+ o_stream_cork(client->output);
+ while (!client->output->closed &&
+ (line = i_stream_next_line(client->input)) != NULL) {
+ args = strchr(line, ' ');
+ if (args != NULL)
+ *args++ = '\0';
+
+ const struct pop3_command *cmd = pop3_command_find(line);
+ if (cmd == NULL) {
+ client_send_line(client, "-ERR Unknown command: %s", line);
+ ret = -1;
+ } else T_BEGIN {
+ const char *reason_code =
+ event_reason_code_prefix("pop3", "cmd_",
+ cmd->name);
+ struct event_reason *reason =
+ event_reason_begin(reason_code);
+ ret = client_command_execute(client, cmd,
+ args != NULL ? args : "");
+ event_reason_end(&reason);
+ } T_END;
+ if (ret >= 0) {
+ client->bad_counter = 0;
+ if (client->cmd != NULL) {
+ o_stream_set_flush_pending(client->output,
+ TRUE);
+ client->waiting_input = TRUE;
+ break;
+ }
+ } else if (++client->bad_counter > CLIENT_MAX_BAD_COMMANDS) {
+ client_send_line(client, "-ERR Too many bad commands.");
+ client_disconnect(client, "Too many bad commands.");
+ }
+ }
+ o_stream_uncork(client->output);
+
+ if (client->output->closed) {
+ client_destroy(client, NULL);
+ return FALSE;
+ }
+ return TRUE;
+}
+
+static void client_input(struct client *client)
+{
+ if (client->cmd != NULL) {
+ /* we're still processing a command. wait until it's
+ finished. */
+ io_remove(&client->io);
+ client->waiting_input = TRUE;
+ return;
+ }
+
+ client->waiting_input = FALSE;
+ client->last_input = ioloop_time;
+ timeout_reset(client->to_idle);
+ if (client->to_commit != NULL)
+ timeout_reset(client->to_commit);
+
+ switch (i_stream_read(client->input)) {
+ case -1:
+ /* disconnected */
+ client_destroy(client, NULL);
+ return;
+ case -2:
+ /* line too long, kill it */
+ client_send_line(client, "-ERR Input line too long.");
+ client_destroy(client, "Input line too long");
+ return;
+ }
+
+ (void)client_handle_input(client);
+}
+
+static int client_output(struct client *client)
+{
+ if (o_stream_flush(client->output) < 0) {
+ client_destroy(client, NULL);
+ return 1;
+ }
+
+ client->last_output = ioloop_time;
+ timeout_reset(client->to_idle);
+ if (client->to_commit != NULL)
+ timeout_reset(client->to_commit);
+
+ if (client->cmd != NULL)
+ client->cmd(client);
+
+ if (client->cmd == NULL) {
+ if (o_stream_get_buffer_used_size(client->output) <
+ POP3_OUTBUF_THROTTLE_SIZE/2 && client->io == NULL &&
+ !client->input->closed) {
+ /* enable input again */
+ client->io = io_add_istream(client->input, client_input,
+ client);
+ }
+ if (client->io != NULL && client->waiting_input) {
+ if (!client_handle_input(client)) {
+ /* client got destroyed */
+ return 1;
+ }
+ }
+ }
+
+ if (client->cmd != NULL) {
+ /* command not finished yet */
+ return 0;
+ } else if (client->io == NULL) {
+ /* data still in output buffer, get back here to add IO */
+ return 0;
+ } else {
+ return 1;
+ }
+}
+
+void clients_destroy_all(void)
+{
+ while (pop3_clients != NULL) {
+ mail_storage_service_io_activate_user(pop3_clients->service_user);
+ if (pop3_clients->cmd == NULL) {
+ client_send_line(pop3_clients,
+ "-ERR [SYS/TEMP] Server shutting down.");
+ }
+ client_destroy(pop3_clients, "Server shutting down.");
+ }
+}
+
+struct pop3_client_vfuncs pop3_client_vfuncs = {
+ client_default_destroy
+};
diff --git a/src/pop3/pop3-client.h b/src/pop3/pop3-client.h
new file mode 100644
index 0000000..5cb3f46
--- /dev/null
+++ b/src/pop3/pop3-client.h
@@ -0,0 +1,146 @@
+#ifndef POP3_CLIENT_H
+#define POP3_CLIENT_H
+
+#include "seq-range-array.h"
+
+struct client;
+struct mail_storage;
+struct mail_storage_service_ctx;
+
+typedef void command_func_t(struct client *client);
+
+#define MSGS_BITMASK_SIZE(client) \
+ (MALLOC_ADD((client)->messages_count, (CHAR_BIT-1)) / CHAR_BIT)
+
+/* Stop reading input when output buffer has this many bytes. Once the buffer
+ size has dropped to half of it, start reading input again. */
+#define POP3_OUTBUF_THROTTLE_SIZE 4096
+
+#define POP3_CLIENT_OUTPUT_FULL(client) \
+ (o_stream_get_buffer_used_size((client)->output) >= POP3_OUTBUF_THROTTLE_SIZE)
+
+struct pop3_client_vfuncs {
+ void (*destroy)(struct client *client, const char *reason);
+
+};
+
+/*
+ pop3_msn = 1..n in the POP3 protocol
+ msgnum = 0..n-1 = pop3_msn-1
+ seq = 1..n = mail's sequence number in lib-storage. when pop3 sort ordering
+ is used, msgnum_to_seq_map[] can be used for translation.
+*/
+struct client {
+ struct client *prev, *next;
+
+ struct pop3_client_vfuncs v;
+
+ int fd_in, fd_out;
+ struct io *io;
+ struct istream *input;
+ struct ostream *output;
+ struct timeout *to_idle, *to_commit;
+
+ command_func_t *cmd;
+ void *cmd_context;
+
+ pool_t pool;
+ struct mail_storage_service_user *service_user;
+ struct mail_user *user;
+ struct mail_namespace *inbox_ns;
+ struct mailbox *mailbox;
+ struct mailbox_transaction_context *trans;
+ struct mail_keywords *deleted_kw;
+
+ struct timeout *to_session_dotlock_refresh;
+ struct dotlock *session_dotlock;
+
+ time_t last_input, last_output;
+ unsigned int bad_counter;
+ unsigned int highest_expunged_fetch_msgnum;
+
+ unsigned int uid_validity;
+ unsigned int messages_count;
+ unsigned int deleted_count, seen_change_count;
+ uoff_t total_size;
+ uoff_t deleted_size;
+ uint32_t last_seen_pop3_msn, lowest_retr_pop3_msn;
+
+ /* All sequences currently visible in the mailbox. */
+ ARRAY_TYPE(seq_range) all_seqs;
+ uint32_t highest_seq;
+
+ /* [msgnum] contains mail seq. anything after it has seq = msgnum+1 */
+ uint32_t *msgnum_to_seq_map;
+ uint32_t msgnum_to_seq_map_count;
+
+ uoff_t top_bytes;
+ uoff_t retr_bytes;
+ unsigned int top_count;
+ unsigned int retr_count;
+
+ /* [msgnum] */
+ const char **message_uidls;
+ uoff_t *message_sizes;
+ /* [msgnum/8] & msgnum%8 */
+ unsigned char *deleted_bitmask;
+ unsigned char *seen_bitmask;
+
+ /* settings: */
+ const struct pop3_settings *set;
+ const struct mail_storage_settings *mail_set;
+ pool_t uidl_pool;
+ enum uidl_keys uidl_keymask;
+
+ /* Module-specific contexts. */
+ ARRAY(union pop3_module_context *) module_contexts;
+
+ bool destroyed:1;
+ bool disconnected:1;
+ bool deleted:1;
+ bool waiting_input:1;
+ bool anvil_sent:1;
+ bool message_uidls_save:1;
+ bool delete_success:1;
+ bool quit_seen:1;
+};
+
+struct pop3_module_register {
+ unsigned int id;
+};
+
+union pop3_module_context {
+ struct pop3_client_vfuncs super;
+ struct pop3_module_register *reg;
+};
+extern struct pop3_module_register pop3_module_register;
+
+extern struct client *pop3_clients;
+extern unsigned int pop3_client_count;
+
+/* Create new client with specified input/output handles. socket specifies
+ if the handle is a socket. */
+struct client *client_create(int fd_in, int fd_out,
+ struct mail_user *user,
+ struct mail_storage_service_user *service_user,
+ const struct pop3_settings *set);
+void client_create_finish(struct client *client);
+int client_init_mailbox(struct client *client, const char **error_r);
+void client_destroy(struct client *client, const char *reason) ATTR_NULL(2);
+
+/* Disconnect client connection */
+void client_disconnect(struct client *client, const char *reason);
+
+/* Send a line of data to client */
+void client_send_line(struct client *client, const char *fmt, ...)
+ ATTR_FORMAT(2, 3);
+void client_send_storage_error(struct client *client);
+
+bool client_handle_input(struct client *client);
+bool client_update_mails(struct client *client);
+
+void clients_destroy_all(void);
+
+int pop3_lock_session(struct client *client);
+
+#endif
diff --git a/src/pop3/pop3-commands.c b/src/pop3/pop3-commands.c
new file mode 100644
index 0000000..b0261e6
--- /dev/null
+++ b/src/pop3/pop3-commands.c
@@ -0,0 +1,956 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+#include "pop3-common.h"
+#include "array.h"
+#include "istream.h"
+#include "ostream.h"
+#include "hash.h"
+#include "str.h"
+#include "var-expand.h"
+#include "message-size.h"
+#include "mail-storage.h"
+#include "mail-storage-settings.h"
+#include "mail-search-build.h"
+#include "pop3-capability.h"
+#include "pop3-commands.h"
+
+static enum mail_sort_type pop3_sort_program[] = {
+ MAIL_SORT_POP3_ORDER,
+ MAIL_SORT_END
+};
+
+static uint32_t msgnum_to_seq(struct client *client, uint32_t msgnum)
+{
+ return msgnum < client->msgnum_to_seq_map_count ?
+ client->msgnum_to_seq_map[msgnum] : msgnum+1;
+}
+
+static const char *get_msgnum(struct client *client, const char *args,
+ unsigned int *msgnum, bool thenspace)
+{
+ unsigned int num;
+
+ if (*args < '0' || *args > '9') {
+ client_send_line(client,
+ "-ERR Invalid message number: %s", args);
+ return NULL;
+ }
+ if (str_parse_uint(args, &num, &args) < 0) {
+ client_send_line(client,
+ "-ERR Message number too large: %s", args);
+ return NULL;
+ }
+ if (*args != (thenspace ? ' ' : '\0')) {
+ client_send_line(client,
+ "-ERR Noise after message number: %s", args);
+ return NULL;
+ }
+ if (num == 0 || num > client->messages_count) {
+ client_send_line(client,
+ "-ERR There's no message %u.", num);
+ return NULL;
+ }
+ num--;
+
+ if (client->deleted) {
+ if ((client->deleted_bitmask[num / CHAR_BIT] &
+ (1 << (num % CHAR_BIT))) != 0) {
+ client_send_line(client, "-ERR Message is deleted.");
+ return NULL;
+ }
+ }
+
+ while (*args == ' ') args++;
+
+ *msgnum = num;
+ return args;
+}
+
+static const char *get_size(struct client *client, const char *args,
+ uoff_t *size, bool thenspace)
+{
+ uoff_t num;
+
+ if (*args < '0' || *args > '9') {
+ client_send_line(client, "-ERR Invalid size: %s",
+ args);
+ return NULL;
+ }
+ if (str_parse_uoff(args, &num, &args) < 0) {
+ client_send_line(client, "-ERR Size too large: %s",
+ args);
+ return NULL;
+ }
+ if (*args != (thenspace ? ' ' : '\0')) {
+ client_send_line(client, "-ERR Noise after size: %s", args);
+ return NULL;
+ }
+
+ while (*args == ' ') args++;
+
+ *size = num;
+ return args;
+}
+
+static int cmd_capa(struct client *client, const char *args ATTR_UNUSED)
+{
+ client_send_line(client, "+OK\r\n"POP3_CAPABILITY_REPLY".");
+ return 1;
+}
+
+static int cmd_dele(struct client *client, const char *args)
+{
+ unsigned int msgnum;
+
+ if (get_msgnum(client, args, &msgnum, FALSE) == NULL)
+ return -1;
+
+ if (!client->deleted) {
+ client->deleted_bitmask = i_malloc(MSGS_BITMASK_SIZE(client));
+ client->deleted = TRUE;
+ }
+
+ client->deleted_bitmask[msgnum / CHAR_BIT] |= 1 << (msgnum % CHAR_BIT);
+ client->deleted_count++;
+ client->deleted_size += client->message_sizes[msgnum];
+ client_send_line(client, "+OK Marked to be deleted.");
+ return 1;
+}
+
+struct cmd_list_context {
+ unsigned int msgnum;
+};
+
+static void cmd_list_callback(struct client *client)
+{
+ struct cmd_list_context *ctx = client->cmd_context;
+
+ for (; ctx->msgnum != client->messages_count; ctx->msgnum++) {
+ if (client->output->closed)
+ break;
+ if (POP3_CLIENT_OUTPUT_FULL(client)) {
+ /* buffer full */
+ return;
+ }
+
+ if (client->deleted) {
+ if ((client->deleted_bitmask[ctx->msgnum / CHAR_BIT] &
+ (1 << (ctx->msgnum % CHAR_BIT))) != 0)
+ continue;
+ }
+
+ client_send_line(client, "%u %"PRIuUOFF_T, ctx->msgnum+1,
+ client->message_sizes[ctx->msgnum]);
+ }
+
+ client_send_line(client, ".");
+
+ i_free(ctx);
+ client->cmd = NULL;
+}
+
+static int cmd_list(struct client *client, const char *args)
+{
+ struct cmd_list_context *ctx;
+
+ if (*args == '\0') {
+ ctx = i_new(struct cmd_list_context, 1);
+ client_send_line(client, "+OK %u messages:",
+ client->messages_count - client->deleted_count);
+
+ client->cmd = cmd_list_callback;
+ client->cmd_context = ctx;
+ cmd_list_callback(client);
+ } else {
+ unsigned int msgnum;
+
+ if (get_msgnum(client, args, &msgnum, FALSE) == NULL)
+ return -1;
+
+ client_send_line(client, "+OK %u %"PRIuUOFF_T, msgnum+1,
+ client->message_sizes[msgnum]);
+ }
+
+ return 1;
+}
+
+static int cmd_last(struct client *client, const char *args ATTR_UNUSED)
+{
+ if (client->set->pop3_enable_last)
+ client_send_line(client, "+OK %u", client->last_seen_pop3_msn);
+ else
+ client_send_line(client, "-ERR LAST command not enabled");
+ return 1;
+}
+
+static int cmd_noop(struct client *client, const char *args ATTR_UNUSED)
+{
+ client_send_line(client, "+OK");
+ return 1;
+}
+
+static struct mail_search_args *
+pop3_search_build_seqset(ARRAY_TYPE(seq_range) *seqset)
+{
+ struct mail_search_args *search_args;
+ struct mail_search_arg *sarg;
+
+ search_args = mail_search_build_init();
+ sarg = mail_search_build_add(search_args, SEARCH_SEQSET);
+ sarg->value.seqset = *seqset;
+ return search_args;
+}
+
+static struct mail_search_args *
+pop3_search_build(struct client *client, uint32_t seq)
+{
+ struct mail_search_args *search_args;
+
+ if (seq == 0)
+ return pop3_search_build_seqset(&client->all_seqs);
+
+ search_args = mail_search_build_init();
+ mail_search_build_add_seqset(search_args, seq, seq);
+ return search_args;
+}
+
+static int client_verify_ordering(struct client *client,
+ struct mail *mail, uint32_t msgnum)
+{
+ uint32_t seq;
+
+ seq = msgnum_to_seq(client, msgnum);
+ if (seq != mail->seq) {
+ i_error("Message ordering changed unexpectedly "
+ "(msg #%u: storage seq %u -> %u)",
+ msgnum+1, seq, mail->seq);
+ return -1;
+ }
+ return 0;
+}
+
+static void client_expunge(struct client *client, struct mail *mail)
+{
+ switch (client->set->parsed_delete_type) {
+ case POP3_DELETE_TYPE_EXPUNGE:
+ mail_expunge(mail);
+ break;
+ case POP3_DELETE_TYPE_FLAG:
+ i_assert(client->deleted_kw != NULL);
+ mail_update_keywords(mail, MODIFY_ADD, client->deleted_kw);
+ break;
+ }
+}
+
+bool client_update_mails(struct client *client)
+{
+ struct mail_search_args *search_args;
+ struct mail_search_context *ctx;
+ struct mail *mail;
+ ARRAY_TYPE(seq_range) deleted_msgs, seen_msgs;
+ uint32_t msgnum, bit;
+ bool ret = TRUE;
+
+ if (mailbox_is_readonly(client->mailbox)) {
+ /* silently ignore */
+ return TRUE;
+ }
+
+ /* translate msgnums to sequences (in case POP3 ordering is
+ different) */
+ t_array_init(&deleted_msgs, 8);
+ if (client->deleted_bitmask != NULL && client->quit_seen) {
+ for (msgnum = 0; msgnum < client->messages_count; msgnum++) {
+ bit = 1 << (msgnum % CHAR_BIT);
+ if ((client->deleted_bitmask[msgnum / CHAR_BIT] & bit) != 0)
+ seq_range_array_add(&deleted_msgs, msgnum_to_seq(client, msgnum));
+ }
+ }
+ t_array_init(&seen_msgs, 8);
+ if (client->seen_bitmask != NULL) {
+ for (msgnum = 0; msgnum < client->messages_count; msgnum++) {
+ bit = 1 << (msgnum % CHAR_BIT);
+ if ((client->seen_bitmask[msgnum / CHAR_BIT] & bit) != 0)
+ seq_range_array_add(&seen_msgs, msgnum_to_seq(client, msgnum));
+ }
+ }
+
+ if (array_count(&deleted_msgs) > 0) {
+ /* expunge DELEted mails */
+ search_args = pop3_search_build_seqset(&deleted_msgs);
+ ctx = mailbox_search_init(client->trans, search_args, NULL, 0, NULL);
+ mail_search_args_unref(&search_args);
+
+ while (mailbox_search_next(ctx, &mail))
+ client_expunge(client, mail);
+ if (mailbox_search_deinit(&ctx) < 0)
+ ret = FALSE;
+ /* don't bother setting \Seen flags for deleted messages */
+ seq_range_array_invert(&deleted_msgs, 1, client->highest_seq);
+ seq_range_array_intersect(&seen_msgs, &deleted_msgs);
+ }
+
+ if (array_count(&seen_msgs) > 0) {
+ /* add \Seen flags for RETRed mails */
+ search_args = pop3_search_build_seqset(&seen_msgs);
+ ctx = mailbox_search_init(client->trans, search_args, NULL, 0, NULL);
+ mail_search_args_unref(&search_args);
+
+ while (mailbox_search_next(ctx, &mail))
+ mail_update_flags(mail, MODIFY_ADD, MAIL_SEEN);
+ if (mailbox_search_deinit(&ctx) < 0)
+ ret = FALSE;
+ }
+
+ client->seen_change_count = 0;
+ return ret;
+}
+
+static int cmd_quit(struct client *client, const char *args ATTR_UNUSED)
+{
+ client->quit_seen = TRUE;
+ if (client->deleted || client->seen_bitmask != NULL) {
+ if (!client_update_mails(client)) {
+ client_send_storage_error(client);
+ client_disconnect(client,
+ "Storage error during logout.");
+ return 1;
+ }
+ }
+
+ if (mailbox_transaction_commit(&client->trans) < 0 ||
+ mailbox_sync(client->mailbox, MAILBOX_SYNC_FLAG_FULL_WRITE) < 0) {
+ client_send_storage_error(client);
+ client_disconnect(client, "Storage error during logout.");
+ return 1;
+ } else {
+ client->delete_success = TRUE;
+ }
+
+ if (!client->deleted)
+ client_send_line(client, "+OK Logging out.");
+ else
+ client_send_line(client, "+OK Logging out, messages deleted.");
+
+ client_disconnect(client, "Logged out");
+ return 1;
+}
+
+struct fetch_context {
+ struct mail *mail;
+ struct istream *stream;
+ uoff_t body_lines;
+
+ uoff_t *byte_counter;
+ uoff_t byte_counter_offset;
+
+ unsigned char last;
+ bool cr_skipped, in_body;
+};
+
+static void fetch_deinit(struct fetch_context *ctx)
+{
+ mail_free(&ctx->mail);
+ i_free(ctx);
+}
+
+static void fetch_callback(struct client *client)
+{
+ struct fetch_context *ctx = client->cmd_context;
+ const unsigned char *data;
+ unsigned char add;
+ size_t i, size;
+ int ret;
+
+ while ((ctx->body_lines > 0 || !ctx->in_body) &&
+ i_stream_read_more(ctx->stream, &data, &size) > 0) {
+ if (size > 4096)
+ size = 4096;
+
+ add = '\0';
+ for (i = 0; i < size; i++) {
+ if ((data[i] == '\r' || data[i] == '\n') &&
+ !ctx->in_body) {
+ if (i == 0 && (ctx->last == '\0' ||
+ ctx->last == '\n'))
+ ctx->in_body = TRUE;
+ else if (i > 0 && data[i-1] == '\n')
+ ctx->in_body = TRUE;
+ }
+
+ if (data[i] == '\n') {
+ if ((i == 0 && ctx->last != '\r') ||
+ (i > 0 && data[i-1] != '\r')) {
+ /* missing CR */
+ add = '\r';
+ break;
+ }
+
+ if (ctx->in_body) {
+ if (--ctx->body_lines == 0) {
+ i++;
+ break;
+ }
+ }
+ } else if (data[i] == '.' &&
+ ((i == 0 && ctx->last == '\n') ||
+ (i > 0 && data[i-1] == '\n'))) {
+ /* escape the dot */
+ add = '.';
+ break;
+ } else if (data[i] == '\0' &&
+ (client->set->parsed_workarounds &
+ WORKAROUND_OUTLOOK_NO_NULS) != 0) {
+ add = 0x80;
+ break;
+ }
+ }
+
+ if (i > 0) {
+ if (o_stream_send(client->output, data, i) < 0)
+ break;
+ ctx->last = data[i-1];
+ i_stream_skip(ctx->stream, i);
+ }
+
+ if (o_stream_get_buffer_used_size(client->output) >= 4096) {
+ if ((ret = o_stream_flush(client->output)) < 0)
+ break;
+ if (ret == 0) {
+ /* continue later */
+ return;
+ }
+ }
+
+ if (add != '\0') {
+ if (o_stream_send(client->output, &add, 1) < 0)
+ break;
+
+ ctx->last = add;
+ if (add == 0x80)
+ i_stream_skip(ctx->stream, 1);
+ }
+ }
+
+ if (ctx->last != '\n') {
+ /* didn't end with CRLF */
+ o_stream_nsend(client->output, "\r\n", 2);
+ }
+
+ if (!ctx->in_body &&
+ (client->set->parsed_workarounds & WORKAROUND_OE_NS_EOH) != 0) {
+ /* Add the missing end of headers line. */
+ o_stream_nsend(client->output, "\r\n", 2);
+ }
+
+ *ctx->byte_counter +=
+ client->output->offset - ctx->byte_counter_offset;
+
+ client_send_line(client, ".");
+ fetch_deinit(ctx);
+ client->cmd = NULL;
+}
+
+static int client_reply_msg_expunged(struct client *client, unsigned int msgnum)
+{
+ client_send_line(client, "-ERR Message %u expunged.", msgnum + 1);
+ if (msgnum <= client->highest_expunged_fetch_msgnum) {
+ /* client tried to fetch an expunged message again.
+ treat this as error so we'll eventually disconnect the
+ client instead of letting it loop forever. */
+ return -1;
+ }
+ client->highest_expunged_fetch_msgnum = msgnum;
+ return 1;
+}
+
+static int fetch(struct client *client, unsigned int msgnum, uoff_t body_lines,
+ const char *reason, uoff_t *byte_counter)
+{
+ struct fetch_context *ctx;
+ int ret;
+
+ ctx = i_new(struct fetch_context, 1);
+ ctx->byte_counter = byte_counter;
+ ctx->byte_counter_offset = client->output->offset;
+ ctx->mail = mail_alloc(client->trans,
+ MAIL_FETCH_STREAM_HEADER |
+ MAIL_FETCH_STREAM_BODY, NULL);
+ mail_set_seq(ctx->mail, msgnum_to_seq(client, msgnum));
+
+ if (mail_get_stream_because(ctx->mail, NULL, NULL, reason, &ctx->stream) < 0) {
+ ret = client_reply_msg_expunged(client, msgnum);
+ fetch_deinit(ctx);
+ return ret;
+ }
+
+ if (body_lines == UOFF_T_MAX && client->seen_bitmask != NULL) {
+ if ((mail_get_flags(ctx->mail) & MAIL_SEEN) == 0) {
+ /* mark the message seen with RETR command */
+ client->seen_bitmask[msgnum / CHAR_BIT] |=
+ 1 << (msgnum % CHAR_BIT);
+ client->seen_change_count++;
+ }
+ }
+
+ ctx->body_lines = body_lines;
+ if (body_lines == UOFF_T_MAX) {
+ client_send_line(client, "+OK %"PRIuUOFF_T" octets",
+ client->message_sizes[msgnum]);
+ } else {
+ client_send_line(client, "+OK");
+ ctx->body_lines++; /* internally we count the empty line too */
+ }
+
+ client->cmd = fetch_callback;
+ client->cmd_context = ctx;
+ fetch_callback(client);
+ return 1;
+}
+
+static int cmd_retr(struct client *client, const char *args)
+{
+ unsigned int msgnum;
+
+ if (get_msgnum(client, args, &msgnum, FALSE) == NULL)
+ return -1;
+
+ if (client->lowest_retr_pop3_msn > msgnum+1 ||
+ client->lowest_retr_pop3_msn == 0)
+ client->lowest_retr_pop3_msn = msgnum+1;
+ if (client->last_seen_pop3_msn < msgnum+1)
+ client->last_seen_pop3_msn = msgnum+1;
+
+ client->retr_count++;
+ return fetch(client, msgnum, UOFF_T_MAX, "RETR", &client->retr_bytes);
+}
+
+static int cmd_rset(struct client *client, const char *args ATTR_UNUSED)
+{
+ struct mail_search_context *search_ctx;
+ struct mail *mail;
+ struct mail_search_args *search_args;
+
+ client->last_seen_pop3_msn = 0;
+
+ if (client->deleted) {
+ client->deleted = FALSE;
+ memset(client->deleted_bitmask, 0, MSGS_BITMASK_SIZE(client));
+ client->deleted_count = 0;
+ client->deleted_size = 0;
+ }
+ if (client->seen_change_count > 0) {
+ memset(client->seen_bitmask, 0, MSGS_BITMASK_SIZE(client));
+ client->seen_change_count = 0;
+ }
+
+ if (client->set->pop3_enable_last) {
+ /* remove all \Seen flags (as specified by RFC 1460) */
+ search_args = pop3_search_build(client, 0);
+ search_ctx = mailbox_search_init(client->trans,
+ search_args, NULL, 0, NULL);
+ mail_search_args_unref(&search_args);
+
+ while (mailbox_search_next(search_ctx, &mail))
+ mail_update_flags(mail, MODIFY_REMOVE, MAIL_SEEN);
+ (void)mailbox_search_deinit(&search_ctx);
+
+ (void)mailbox_transaction_commit(&client->trans);
+ client->trans = mailbox_transaction_begin(client->mailbox, 0,
+ __func__);
+ }
+
+ client_send_line(client, "+OK");
+ return 1;
+}
+
+static int cmd_stat(struct client *client, const char *args ATTR_UNUSED)
+{
+ client_send_line(client, "+OK %u %"PRIuUOFF_T,
+ client->messages_count - client->deleted_count,
+ client->total_size - client->deleted_size);
+ return 1;
+}
+
+static int cmd_top(struct client *client, const char *args)
+{
+ unsigned int msgnum;
+ uoff_t max_lines;
+
+ args = get_msgnum(client, args, &msgnum, TRUE);
+ if (args == NULL)
+ return -1;
+ if (get_size(client, args, &max_lines, FALSE) == NULL)
+ return -1;
+
+ client->top_count++;
+ return fetch(client, msgnum, max_lines, "TOP", &client->top_bytes);
+}
+
+struct cmd_uidl_context {
+ struct mail_search_context *search_ctx;
+ struct mail *mail;
+ uint32_t msgnum;
+ bool list_all;
+};
+
+static int
+pop3_get_uid(struct client *client, struct mail *mail, string_t *str,
+ bool *permanent_uidl_r)
+{
+ char uid_str[MAX_INT_STRLEN] = { 0 };
+ const char *uidl;
+ const char *hdr_md5 = NULL, *filename = NULL, *guid = NULL;
+
+ if (mail_get_special(mail, MAIL_FETCH_UIDL_BACKEND, &uidl) == 0 &&
+ *uidl != '\0') {
+ str_append(str, uidl);
+ /* UIDL is already permanent */
+ *permanent_uidl_r = TRUE;
+ return 0;
+ }
+
+ *permanent_uidl_r = FALSE;
+
+ if (client->set->pop3_reuse_xuidl &&
+ mail_get_first_header(mail, "X-UIDL", &uidl) > 0) {
+ str_append(str, uidl);
+ return 0;
+ }
+
+ if ((client->uidl_keymask & UIDL_UID) != 0) {
+ if (i_snprintf(uid_str, sizeof(uid_str), "%u", mail->uid) < 0)
+ i_unreached();
+ }
+ if ((client->uidl_keymask & UIDL_MD5) != 0) {
+ if (mail_get_special(mail, MAIL_FETCH_HEADER_MD5,
+ &hdr_md5) < 0) {
+ i_error("UIDL: Header MD5 lookup failed: %s",
+ mailbox_get_last_internal_error(mail->box, NULL));
+ return -1;
+ } else if (hdr_md5[0] == '\0') {
+ i_error("UIDL: Header MD5 not found "
+ "(pop3_uidl_format=%%m not supported by storage?)");
+ return -1;
+ }
+ }
+ if ((client->uidl_keymask & UIDL_FILE_NAME) != 0) {
+ if (mail_get_special(mail, MAIL_FETCH_STORAGE_ID,
+ &filename) < 0) {
+ i_error("UIDL: File name lookup failed: %s",
+ mailbox_get_last_internal_error(mail->box, NULL));
+ return -1;
+ } else if (filename[0] == '\0') {
+ i_error("UIDL: File name not found "
+ "(pop3_uidl_format=%%f not supported by storage?)");
+ return -1;
+ }
+ }
+ if ((client->uidl_keymask & UIDL_GUID) != 0) {
+ if (mail_get_special(mail, MAIL_FETCH_GUID,
+ &guid) < 0) {
+ i_error("UIDL: Message GUID lookup failed: %s",
+ mailbox_get_last_internal_error(mail->box, NULL));
+ return -1;
+ } else if (guid[0] == '\0') {
+ i_error("UIDL: Message GUID not found "
+ "(pop3_uidl_format=%%g not supported by storage?)");
+ return -1;
+ }
+ }
+
+ const struct var_expand_table tab[] = {
+ { 'v', dec2str(client->uid_validity), "uidvalidity" },
+ { 'u', uid_str, "uid" },
+ { 'm', hdr_md5, "md5" },
+ { 'f', filename, "filename" },
+ { 'g', guid, "guid" },
+ { '\0', NULL, NULL }
+ };
+ const char *error;
+
+ if (var_expand(str, client->mail_set->pop3_uidl_format,
+ tab, &error) <= 0) {
+ i_error("UIDL: Failed to expand pop3_uidl_format=%s: %s",
+ client->mail_set->pop3_uidl_format, error);
+ return -1;
+ }
+ return 0;
+}
+
+static bool
+list_uidls_saved_iter(struct client *client, struct cmd_uidl_context *ctx)
+{
+ bool found = FALSE;
+
+ while (ctx->msgnum < client->messages_count) {
+ uint32_t msgnum = ctx->msgnum++;
+
+ if (client->deleted) {
+ if ((client->deleted_bitmask[msgnum / CHAR_BIT] &
+ (1 << (msgnum % CHAR_BIT))) != 0)
+ continue;
+ }
+ found = TRUE;
+
+ client_send_line(client,
+ ctx->list_all ? "%u %s" : "+OK %u %s",
+ msgnum+1, client->message_uidls[msgnum]);
+ if (client->output->closed || !ctx->list_all)
+ break;
+ if (POP3_CLIENT_OUTPUT_FULL(client)) {
+ /* output is being buffered, continue when there's
+ more space */
+ return FALSE;
+ }
+ }
+ /* finished */
+ client->cmd = NULL;
+
+ if (ctx->list_all)
+ client_send_line(client, ".");
+ i_free(ctx);
+ return found;
+}
+
+static bool list_uids_iter(struct client *client, struct cmd_uidl_context *ctx)
+{
+ string_t *str;
+ bool permanent_uidl, found = FALSE;
+ bool failed = FALSE;
+
+ if (client->message_uidls != NULL)
+ return list_uidls_saved_iter(client, ctx);
+
+ str = t_str_new(128);
+ while (mailbox_search_next(ctx->search_ctx, &ctx->mail)) {
+ uint32_t msgnum = ctx->msgnum++;
+
+ if (client_verify_ordering(client, ctx->mail, msgnum) < 0) {
+ failed = TRUE;
+ break;
+ }
+ if (client->deleted) {
+ if ((client->deleted_bitmask[msgnum / CHAR_BIT] &
+ (1 << (msgnum % CHAR_BIT))) != 0)
+ continue;
+ }
+ found = TRUE;
+
+ str_truncate(str, 0);
+ if (pop3_get_uid(client, ctx->mail, str, &permanent_uidl) < 0) {
+ failed = TRUE;
+ break;
+ }
+ if (client->set->pop3_save_uidl && !permanent_uidl)
+ mail_update_pop3_uidl(ctx->mail, str_c(str));
+
+ client_send_line(client, ctx->list_all ? "%u %s" : "+OK %u %s",
+ msgnum+1, str_c(str));
+ if (client->output->closed)
+ break;
+ if (POP3_CLIENT_OUTPUT_FULL(client) && ctx->list_all) {
+ /* output is being buffered, continue when there's
+ more space */
+ return FALSE;
+ }
+ }
+
+ /* finished */
+ (void)mailbox_search_deinit(&ctx->search_ctx);
+
+ client->cmd = NULL;
+
+ if (ctx->list_all && !failed)
+ client_send_line(client, ".");
+ i_free(ctx);
+ if (failed)
+ client_disconnect(client, "POP3 UIDLs couldn't be listed");
+ return found || failed;
+}
+
+static void cmd_uidl_callback(struct client *client)
+{
+ struct cmd_uidl_context *ctx = client->cmd_context;
+
+ (void)list_uids_iter(client, ctx);
+}
+
+HASH_TABLE_DEFINE_TYPE(uidl_counter, char *, void *);
+
+static void
+uidl_rename_duplicate(string_t *uidl, HASH_TABLE_TYPE(uidl_counter) prev_uidls)
+{
+ char *key;
+ void *value;
+ unsigned int counter;
+
+ while (hash_table_lookup_full(prev_uidls, str_c(uidl), &key, &value)) {
+ /* duplicate. the value contains the number of duplicates. */
+ counter = POINTER_CAST_TO(value, unsigned int) + 1;
+ hash_table_update(prev_uidls, key, POINTER_CAST(counter));
+ str_printfa(uidl, "-%u", counter);
+ /* the second lookup really should return NULL, but just in
+ case of some weird UIDLs do this as many times as needed */
+ }
+}
+
+static void client_uidls_save(struct client *client)
+{
+ struct mail_search_context *search_ctx;
+ struct mail_search_args *search_args;
+ struct mail *mail;
+ HASH_TABLE_TYPE(uidl_counter) prev_uidls;
+ const char **seq_uidls;
+ string_t *str;
+ char *uidl;
+ enum mail_fetch_field wanted_fields;
+ uint32_t msgnum;
+ bool permanent_uidl, uidl_duplicates_rename, failed = FALSE;
+
+ i_assert(client->message_uidls == NULL);
+
+ search_args = pop3_search_build(client, 0);
+ wanted_fields = 0;
+ if ((client->uidl_keymask & UIDL_MD5) != 0)
+ wanted_fields |= MAIL_FETCH_HEADER_MD5;
+
+ search_ctx = mailbox_search_init(client->trans, search_args,
+ NULL, wanted_fields, NULL);
+ mail_search_args_unref(&search_args);
+
+ uidl_duplicates_rename =
+ strcmp(client->set->pop3_uidl_duplicates, "rename") == 0;
+ if (uidl_duplicates_rename)
+ hash_table_create(&prev_uidls, default_pool, 0, str_hash,
+ strcmp);
+ client->uidl_pool = pool_alloconly_create("message uidls", 1024);
+
+ /* first read all the UIDLs into a temporary [seq] array */
+ seq_uidls = i_new(const char *, client->highest_seq);
+ str = t_str_new(128);
+ while (mailbox_search_next(search_ctx, &mail)) {
+ str_truncate(str, 0);
+ if (pop3_get_uid(client, mail, str, &permanent_uidl) < 0) {
+ failed = TRUE;
+ break;
+ }
+ if (uidl_duplicates_rename)
+ uidl_rename_duplicate(str, prev_uidls);
+
+ uidl = p_strdup(client->uidl_pool, str_c(str));
+ if (client->set->pop3_save_uidl && !permanent_uidl)
+ mail_update_pop3_uidl(mail, uidl);
+
+ i_assert(mail->seq <= client->highest_seq);
+ seq_uidls[mail->seq-1] = uidl;
+ if (uidl_duplicates_rename)
+ hash_table_update(prev_uidls, uidl, POINTER_CAST(1));
+ }
+ (void)mailbox_search_deinit(&search_ctx);
+ if (uidl_duplicates_rename)
+ hash_table_destroy(&prev_uidls);
+
+ if (failed) {
+ pool_unref(&client->uidl_pool);
+ i_free(seq_uidls);
+ return;
+ }
+ /* map UIDLs to msgnums (in case POP3 sort ordering is different) */
+ client->message_uidls = p_new(client->uidl_pool, const char *,
+ MALLOC_ADD(client->messages_count, 1));
+ for (msgnum = 0; msgnum < client->messages_count; msgnum++) {
+ client->message_uidls[msgnum] =
+ seq_uidls[msgnum_to_seq(client, msgnum) - 1];
+ }
+ i_free(seq_uidls);
+}
+
+static struct cmd_uidl_context *
+cmd_uidl_init(struct client *client, uint32_t seq)
+{
+ struct cmd_uidl_context *ctx;
+ struct mail_search_args *search_args;
+ enum mail_fetch_field wanted_fields;
+
+ if (client->message_uidls_save && client->message_uidls == NULL &&
+ client->messages_count > 0)
+ client_uidls_save(client);
+
+ ctx = i_new(struct cmd_uidl_context, 1);
+ ctx->list_all = seq == 0;
+
+ if (client->message_uidls == NULL) {
+ wanted_fields = 0;
+ if ((client->uidl_keymask & UIDL_MD5) != 0)
+ wanted_fields |= MAIL_FETCH_HEADER_MD5;
+
+ search_args = pop3_search_build(client, seq);
+ ctx->search_ctx = mailbox_search_init(client->trans, search_args,
+ pop3_sort_program,
+ wanted_fields, NULL);
+ mail_search_args_unref(&search_args);
+ }
+
+ if (seq == 0) {
+ client->cmd = cmd_uidl_callback;
+ client->cmd_context = ctx;
+ }
+ return ctx;
+}
+
+static int cmd_uidl(struct client *client, const char *args)
+{
+ struct cmd_uidl_context *ctx;
+ uint32_t seq;
+
+ if (*args == '\0') {
+ client_send_line(client, "+OK");
+ ctx = cmd_uidl_init(client, 0);
+ (void)list_uids_iter(client, ctx);
+ } else {
+ unsigned int msgnum;
+
+ if (get_msgnum(client, args, &msgnum, FALSE) == NULL)
+ return -1;
+
+ seq = msgnum_to_seq(client, msgnum);
+ ctx = cmd_uidl_init(client, seq);
+ ctx->msgnum = msgnum;
+ if (!list_uids_iter(client, ctx))
+ return client_reply_msg_expunged(client, msgnum);
+ }
+
+ return 1;
+}
+
+static const struct pop3_command pop3_commands[] = {
+ { "capa", cmd_capa },
+ { "dele", cmd_dele },
+ { "list", cmd_list },
+ { "last", cmd_last },
+ { "noop", cmd_noop },
+ { "quit", cmd_quit },
+ { "retr", cmd_retr },
+ { "rset", cmd_rset },
+ { "stat", cmd_stat },
+ { "top", cmd_top },
+ { "uidl", cmd_uidl },
+};
+
+const struct pop3_command *pop3_command_find(const char *name)
+{
+ for (unsigned int i = 0; i < N_ELEMENTS(pop3_commands); i++) {
+ if (strcasecmp(pop3_commands[i].name, name) == 0)
+ return &pop3_commands[i];
+ }
+ return NULL;
+}
+
+int client_command_execute(struct client *client,
+ const struct pop3_command *cmd, const char *args)
+{
+ while (*args == ' ') args++;
+
+ return cmd->func(client, args);
+}
diff --git a/src/pop3/pop3-commands.h b/src/pop3/pop3-commands.h
new file mode 100644
index 0000000..37dd229
--- /dev/null
+++ b/src/pop3/pop3-commands.h
@@ -0,0 +1,13 @@
+#ifndef POP3_COMMANDS_H
+#define POP3_COMMANDS_H
+
+struct pop3_command {
+ const char *name;
+ int (*func)(struct client *client, const char *args);
+};
+
+const struct pop3_command *pop3_command_find(const char *name);
+int client_command_execute(struct client *client,
+ const struct pop3_command *cmd, const char *args);
+
+#endif
diff --git a/src/pop3/pop3-common.h b/src/pop3/pop3-common.h
new file mode 100644
index 0000000..eb3f521
--- /dev/null
+++ b/src/pop3/pop3-common.h
@@ -0,0 +1,27 @@
+#ifndef POP3_COMMON_H
+#define POP3_COMMON_H
+
+enum uidl_keys {
+ UIDL_UIDVALIDITY = 0x01,
+ UIDL_UID = 0x02,
+ UIDL_MD5 = 0x04,
+ UIDL_FILE_NAME = 0x08,
+ UIDL_GUID = 0x10
+};
+
+#include "lib.h"
+#include "pop3-client.h"
+#include "pop3-settings.h"
+
+typedef void pop3_client_created_func_t(struct client **client);
+
+extern pop3_client_created_func_t *hook_client_created;
+
+/* Sets the hook_client_created and returns the previous hook,
+ which the new_hook should call if it's non-NULL. */
+pop3_client_created_func_t *
+pop3_client_created_hook_set(pop3_client_created_func_t *new_hook);
+
+void pop3_refresh_proctitle(void);
+
+#endif
diff --git a/src/pop3/pop3-settings.c b/src/pop3/pop3-settings.c
new file mode 100644
index 0000000..0606dc8
--- /dev/null
+++ b/src/pop3/pop3-settings.c
@@ -0,0 +1,184 @@
+/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "buffer.h"
+#include "settings-parser.h"
+#include "service-settings.h"
+#include "mail-storage-settings.h"
+#include "pop3-settings.h"
+
+#include <stddef.h>
+#include <unistd.h>
+
+static bool pop3_settings_verify(void *_set, pool_t pool,
+ const char **error_r);
+
+/* <settings checks> */
+static struct file_listener_settings pop3_unix_listeners_array[] = {
+ { "login/pop3", 0666, "", "" }
+};
+static struct file_listener_settings *pop3_unix_listeners[] = {
+ &pop3_unix_listeners_array[0]
+};
+static buffer_t pop3_unix_listeners_buf = {
+ { { pop3_unix_listeners, sizeof(pop3_unix_listeners) } }
+};
+/* </settings checks> */
+
+struct service_settings pop3_service_settings = {
+ .name = "pop3",
+ .protocol = "pop3",
+ .type = "",
+ .executable = "pop3",
+ .user = "",
+ .group = "",
+ .privileged_group = "",
+ .extra_groups = "$default_internal_group",
+ .chroot = "",
+
+ .drop_priv_before_exec = FALSE,
+
+ .process_min_avail = 0,
+ .process_limit = 1024,
+ .client_limit = 1,
+ .service_count = 1,
+ .idle_kill = 0,
+ .vsz_limit = UOFF_T_MAX,
+
+ .unix_listeners = { { &pop3_unix_listeners_buf,
+ sizeof(pop3_unix_listeners[0]) } },
+ .fifo_listeners = ARRAY_INIT,
+ .inet_listeners = ARRAY_INIT
+};
+
+#undef DEF
+#undef DEFLIST
+#define DEF(type, name) \
+ SETTING_DEFINE_STRUCT_##type(#name, name, struct pop3_settings)
+#define DEFLIST(field, name, defines) \
+ { .type = SET_DEFLIST, .key = name, \
+ .offset = offsetof(struct pop3_settings, field), \
+ .list_info = defines }
+
+static const struct setting_define pop3_setting_defines[] = {
+ DEF(BOOL, verbose_proctitle),
+ DEF(STR_VARS, rawlog_dir),
+
+ DEF(BOOL, pop3_no_flag_updates),
+ DEF(BOOL, pop3_enable_last),
+ DEF(BOOL, pop3_reuse_xuidl),
+ DEF(BOOL, pop3_save_uidl),
+ DEF(BOOL, pop3_lock_session),
+ DEF(BOOL, pop3_fast_size_lookups),
+ DEF(STR, pop3_client_workarounds),
+ DEF(STR, pop3_logout_format),
+ DEF(ENUM, pop3_uidl_duplicates),
+ DEF(STR, pop3_deleted_flag),
+ DEF(ENUM, pop3_delete_type),
+
+ SETTING_DEFINE_LIST_END
+};
+
+static const struct pop3_settings pop3_default_settings = {
+ .verbose_proctitle = FALSE,
+ .rawlog_dir = "",
+
+ .pop3_no_flag_updates = FALSE,
+ .pop3_enable_last = FALSE,
+ .pop3_reuse_xuidl = FALSE,
+ .pop3_save_uidl = FALSE,
+ .pop3_lock_session = FALSE,
+ .pop3_fast_size_lookups = FALSE,
+ .pop3_client_workarounds = "",
+ .pop3_logout_format = "top=%t/%p, retr=%r/%b, del=%d/%m, size=%s",
+ .pop3_uidl_duplicates = "allow:rename",
+ .pop3_deleted_flag = "",
+ .pop3_delete_type = "default:expunge:flag"
+};
+
+static const struct setting_parser_info *pop3_setting_dependencies[] = {
+ &mail_user_setting_parser_info,
+ NULL
+};
+
+const struct setting_parser_info pop3_setting_parser_info = {
+ .module_name = "pop3",
+ .defines = pop3_setting_defines,
+ .defaults = &pop3_default_settings,
+
+ .type_offset = SIZE_MAX,
+ .struct_size = sizeof(struct pop3_settings),
+
+ .parent_offset = SIZE_MAX,
+
+ .check_func = pop3_settings_verify,
+ .dependencies = pop3_setting_dependencies
+};
+
+/* <settings checks> */
+struct pop3_client_workaround_list {
+ const char *name;
+ enum pop3_client_workarounds num;
+};
+
+static const struct pop3_client_workaround_list pop3_client_workaround_list[] = {
+ { "outlook-no-nuls", WORKAROUND_OUTLOOK_NO_NULS },
+ { "oe-ns-eoh", WORKAROUND_OE_NS_EOH },
+ { NULL, 0 }
+};
+
+static int
+pop3_settings_parse_workarounds(struct pop3_settings *set,
+ const char **error_r)
+{
+ enum pop3_client_workarounds client_workarounds = 0;
+ const struct pop3_client_workaround_list *list;
+ const char *const *str;
+
+ str = t_strsplit_spaces(set->pop3_client_workarounds, " ,");
+ for (; *str != NULL; str++) {
+ list = pop3_client_workaround_list;
+ for (; list->name != NULL; list++) {
+ if (strcasecmp(*str, list->name) == 0) {
+ client_workarounds |= list->num;
+ break;
+ }
+ }
+ if (list->name == NULL) {
+ *error_r = t_strdup_printf("pop3_client_workarounds: "
+ "Unknown workaround: %s", *str);
+ return -1;
+ }
+ }
+ set->parsed_workarounds = client_workarounds;
+ return 0;
+}
+
+static bool
+pop3_settings_verify(void *_set, pool_t pool ATTR_UNUSED, const char **error_r)
+{
+ struct pop3_settings *set = _set;
+
+ if (pop3_settings_parse_workarounds(set, error_r) < 0)
+ return FALSE;
+ if (strcmp(set->pop3_delete_type, "default") == 0) {
+ if (set->pop3_deleted_flag[0] == '\0')
+ set->parsed_delete_type = POP3_DELETE_TYPE_EXPUNGE;
+ else
+ set->parsed_delete_type = POP3_DELETE_TYPE_FLAG;
+ } else if (strcmp(set->pop3_delete_type, "expunge") == 0) {
+ set->parsed_delete_type = POP3_DELETE_TYPE_EXPUNGE;
+ } else if (strcmp(set->pop3_delete_type, "flag") == 0) {
+ if (set->pop3_deleted_flag[0] == '\0') {
+ *error_r = "pop3_delete_type=flag, but pop3_deleted_flag not set";
+ return FALSE;
+ }
+ set->parsed_delete_type = POP3_DELETE_TYPE_FLAG;
+ } else {
+ *error_r = t_strdup_printf("pop3_delete_type: Unknown value '%s'",
+ set->pop3_delete_type);
+ return FALSE;
+ }
+ return TRUE;
+}
+/* </settings checks> */
diff --git a/src/pop3/pop3-settings.h b/src/pop3/pop3-settings.h
new file mode 100644
index 0000000..cf50f98
--- /dev/null
+++ b/src/pop3/pop3-settings.h
@@ -0,0 +1,40 @@
+#ifndef POP3_SETTINGS_H
+#define POP3_SETTINGS_H
+
+struct mail_user_settings;
+
+/* <settings checks> */
+enum pop3_client_workarounds {
+ WORKAROUND_OUTLOOK_NO_NULS = 0x01,
+ WORKAROUND_OE_NS_EOH = 0x02
+};
+enum pop3_delete_type {
+ POP3_DELETE_TYPE_EXPUNGE = 0,
+ POP3_DELETE_TYPE_FLAG,
+};
+/* </settings checks> */
+
+struct pop3_settings {
+ bool verbose_proctitle;
+ const char *rawlog_dir;
+
+ /* pop3: */
+ bool pop3_no_flag_updates;
+ bool pop3_enable_last;
+ bool pop3_reuse_xuidl;
+ bool pop3_save_uidl;
+ bool pop3_lock_session;
+ bool pop3_fast_size_lookups;
+ const char *pop3_client_workarounds;
+ const char *pop3_logout_format;
+ const char *pop3_uidl_duplicates;
+ const char *pop3_deleted_flag;
+ const char *pop3_delete_type;
+
+ enum pop3_client_workarounds parsed_workarounds;
+ enum pop3_delete_type parsed_delete_type;
+};
+
+extern const struct setting_parser_info pop3_setting_parser_info;
+
+#endif