Adding upstream version 1:2.3.21+dfsg1.upstream/1%2.3.21+dfsg1

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

12 files changed, 2521 insertions, 0 deletions

diff --git a/src/dict/Makefile.am b/src/dict/Makefile.am
new file mode 100644
index 0000000..e408046
--- /dev/null
+++ b/src/dict/Makefile.am
@@ -0,0 +1,43 @@
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+	-I$(top_srcdir)/src/lib-sql \
+	-DDICT_MODULE_DIR=\""$(moduledir)/dict"\" \
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+	main.h
diff --git a/src/dict/Makefile.in b/src/dict/Makefile.in
new file mode 100644
index 0000000..f4b323f
--- /dev/null
+++ b/src/dict/Makefile.in
@@ -0,0 +1,847 @@
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+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib \
+	-I$(top_srcdir)/src/lib-master \
+	-I$(top_srcdir)/src/lib-settings \
+	-I$(top_srcdir)/src/lib-dict \
+	-I$(top_srcdir)/src/lib-sql \
+	-DDICT_MODULE_DIR=\""$(moduledir)/dict"\" \
+	-DPKG_RUNDIR=\""$(rundir)"\" \
+	$(BINARY_CFLAGS)
+
+dict_LDFLAGS = -export-dynamic \
+	$(BINARY_LDFLAGS)
+
+libs = \
+	../lib-dict-backend/libdict_backend.la \
+	$(LIBDOVECOT_SQL)
+
+dict_LDADD = \
+	$(libs) \
+	$(LIBDOVECOT) \
+	$(DICT_LIBS) \
+	$(SQL_LIBS) \
+	-lm
+
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+	dict-connection.c \
+	dict-commands.c \
+	dict-settings.c \
+	dict-init-cache.c \
+	main.c
+
+noinst_HEADERS = \
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+	dict-settings.h \
+	dict-init-cache.h \
+	main.h
+
+all: all-am
+
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+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
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+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/dict/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/dict/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
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+	  *config.status*) \
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+	    } \
+	; done
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+uninstall-pkglibexecPROGRAMS:
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+	@list='$(pkglibexec_PROGRAMS)'; test -n "$(pkglibexecdir)" || list=; \
+	files=`for p in $$list; do echo "$$p"; done | \
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+	test -n "$$list" || exit 0; \
+	echo " ( cd '$(DESTDIR)$(pkglibexecdir)' && rm -f" $$files ")"; \
+	cd "$(DESTDIR)$(pkglibexecdir)" && rm -f $$files
+
+clean-pkglibexecPROGRAMS:
+	@list='$(pkglibexec_PROGRAMS)'; test -n "$$list" || exit 0; \
+	echo " rm -f" $$list; \
+	rm -f $$list || exit $$?; \
+	test -n "$(EXEEXT)" || exit 0; \
+	list=`for p in $$list; do echo "$$p"; done | sed 's/$(EXEEXT)$$//'`; \
+	echo " rm -f" $$list; \
+	rm -f $$list
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+	@rm -f dict$(EXEEXT)
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+
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+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/dict-commands.Po@am__quote@ # am--include-marker
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+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/main.Po@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
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+	      $$unique; \
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+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
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+	esac; \
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+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
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+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
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+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
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+distclean-generic:
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+	-rm -f ./$(DEPDIR)/dict-settings.Po
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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/dict/dict-commands.c b/src/dict/dict-commands.c
new file mode 100644
index 0000000..da6acce
--- /dev/null
+++ b/src/dict/dict-commands.c
@@ -0,0 +1,797 @@
+/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "ostream.h"
+#include "str.h"
+#include "strescape.h"
+#include "stats-dist.h"
+#include "time-util.h"
+#include "dict-private.h"
+#include "dict-client.h"
+#include "dict-settings.h"
+#include "dict-connection.h"
+#include "dict-commands.h"
+#include "main.h"
+
+#define DICT_CLIENT_PROTOCOL_TIMINGS_MIN_VERSION 1
+#define DICT_CLIENT_PROTOCOL_UNORDERED_MIN_VERSION 1
+#define DICT_OUTPUT_OPTIMAL_SIZE 1024
+
+struct dict_cmd_func {
+	enum dict_protocol_cmd cmd;
+	int (*func)(struct dict_connection_cmd *cmd, const char *const *args);
+};
+
+struct dict_connection_cmd {
+	const struct dict_cmd_func *cmd;
+	struct dict_connection *conn;
+	struct timeval start_timeval;
+	struct event *event;
+	char *reply;
+
+	struct dict_iterate_context *iter;
+	enum dict_iterate_flags iter_flags;
+
+	unsigned int async_reply_id;
+	unsigned int trans_id; /* obsolete */
+	unsigned int rows;
+
+	bool uncork_pending;
+};
+
+struct dict_command_stats cmd_stats;
+
+static int cmd_iterate_flush(struct dict_connection_cmd *cmd);
+
+static bool dict_connection_cmd_output_more(struct dict_connection_cmd *cmd);
+
+static void dict_connection_cmd_free(struct dict_connection_cmd *cmd)
+{
+	const char *error;
+
+	if (dict_iterate_deinit(&cmd->iter, &error) < 0)
+		e_error(cmd->event, "dict_iterate() failed: %s", error);
+	i_free(cmd->reply);
+	if (cmd->uncork_pending)
+		o_stream_uncork(cmd->conn->conn.output);
+
+	if (dict_connection_unref(cmd->conn) && !cmd->conn->destroyed)
+		connection_input_resume(&cmd->conn->conn);
+	event_unref(&cmd->event);
+	i_free(cmd);
+}
+
+static void dict_connection_cmd_remove(struct dict_connection_cmd *cmd)
+{
+	struct dict_connection_cmd *const *cmds;
+	unsigned int i, count;
+
+	cmds = array_get(&cmd->conn->cmds, &count);
+	for (i = 0; i < count; i++) {
+		if (cmds[i] == cmd) {
+			array_delete(&cmd->conn->cmds, i, 1);
+			dict_connection_cmd_free(cmd);
+			return;
+		}
+	}
+	i_unreached();
+}
+
+static void dict_connection_cmds_flush(struct dict_connection *conn)
+{
+	struct dict_connection_cmd *cmd, *const *first_cmdp;
+
+	i_assert(conn->conn.minor_version < DICT_CLIENT_PROTOCOL_UNORDERED_MIN_VERSION);
+
+	dict_connection_ref(conn);
+	while (array_count(&conn->cmds) > 0) {
+		first_cmdp = array_front(&conn->cmds);
+		cmd = *first_cmdp;
+
+		i_assert(cmd->async_reply_id == 0);
+
+		/* we may be able to start outputting iterations now. */
+		if (cmd->iter != NULL)
+			(void)cmd_iterate_flush(cmd);
+
+		if (cmd->reply == NULL) {
+			/* command not finished yet */
+			break;
+		}
+
+		o_stream_nsend_str(conn->conn.output, cmd->reply);
+		dict_connection_cmd_remove(cmd);
+	}
+	dict_connection_unref_safe(conn);
+}
+
+static void dict_connection_cmd_try_flush(struct dict_connection_cmd **_cmd)
+{
+	struct dict_connection_cmd *cmd = *_cmd;
+
+	*_cmd = NULL;
+	if (cmd->conn->conn.minor_version < DICT_CLIENT_PROTOCOL_UNORDERED_MIN_VERSION) {
+		dict_connection_cmds_flush(cmd->conn);
+		return;
+	}
+	i_assert(cmd->async_reply_id != 0);
+	i_assert(cmd->reply != NULL);
+
+	o_stream_nsend_str(cmd->conn->conn.output, t_strdup_printf("%c%u\t%s",
+		DICT_PROTOCOL_REPLY_ASYNC_REPLY,
+		cmd->async_reply_id, cmd->reply));
+	dict_connection_cmd_remove(cmd);
+}
+
+static void dict_connection_cmd_async(struct dict_connection_cmd *cmd)
+{
+	if (cmd->conn->conn.minor_version < DICT_CLIENT_PROTOCOL_UNORDERED_MIN_VERSION)
+		return;
+
+	i_assert(cmd->async_reply_id == 0);
+	cmd->async_reply_id = ++cmd->conn->async_id_counter;
+	if (cmd->async_reply_id == 0)
+		cmd->async_reply_id = ++cmd->conn->async_id_counter;
+	o_stream_nsend_str(cmd->conn->conn.output, t_strdup_printf("%c%u\n",
+		DICT_PROTOCOL_REPLY_ASYNC_ID, cmd->async_reply_id));
+}
+
+static void
+cmd_stats_update(struct dict_connection_cmd *cmd, struct stats_dist *stats)
+{
+	long long diff;
+
+	if (!dict_settings->verbose_proctitle)
+		return;
+
+	diff = timeval_diff_usecs(&ioloop_timeval, &cmd->start_timeval);
+	if (diff < 0)
+		diff = 0;
+	stats_dist_add(stats, diff);
+	dict_proctitle_update_later();
+}
+
+static void
+dict_cmd_reply_handle_stats(struct dict_connection_cmd *cmd,
+			    string_t *str, struct stats_dist *stats)
+{
+	io_loop_time_refresh();
+	cmd_stats_update(cmd, stats);
+
+	if (cmd->conn->conn.minor_version < DICT_CLIENT_PROTOCOL_TIMINGS_MIN_VERSION)
+		return;
+	str_printfa(str, "\t%ld\t%u\t%ld\t%u",
+		    (long)cmd->start_timeval.tv_sec,
+		    (unsigned int)cmd->start_timeval.tv_usec,
+		    (long)ioloop_timeval.tv_sec,
+		    (unsigned int)ioloop_timeval.tv_usec);
+}
+
+static void
+cmd_lookup_write_reply(struct dict_connection_cmd *cmd,
+		       const char *const *values, string_t *str)
+{
+	string_t *tmp;
+
+	i_assert(values[0] != NULL);
+
+	if (cmd->conn->conn.minor_version < DICT_CLIENT_PROTOCOL_VERSION_MIN_MULTI_OK ||
+	    values[1] == NULL) {
+		str_append_c(str, DICT_PROTOCOL_REPLY_OK);
+		str_append_tabescaped(str, values[0]);
+		return;
+	}
+	/* the results get double-tabescaped so they end up becoming a single
+	   parameter */
+	tmp = t_str_new(128);
+	for (unsigned int i = 0; values[i] != NULL; i++) {
+		str_append_c(tmp, '\t');
+		str_append_tabescaped(tmp, values[i]);
+	}
+	str_append_c(str, DICT_PROTOCOL_REPLY_MULTI_OK);
+	str_append_tabescaped(str, str_c(tmp) + 1);
+}
+
+static void
+cmd_lookup_callback(const struct dict_lookup_result *result,
+		    struct dict_connection_cmd *cmd)
+{
+	string_t *str = t_str_new(128);
+
+	event_set_name(cmd->event, "dict_server_lookup_finished");
+	if (result->ret > 0) {
+		cmd_lookup_write_reply(cmd, result->values, str);
+		e_debug(cmd->event, "Lookup finished");
+	} else if (result->ret == 0) {
+		event_add_str(cmd->event, "key_not_found", "yes");
+		str_append_c(str, DICT_PROTOCOL_REPLY_NOTFOUND);
+		e_debug(cmd->event, "Lookup finished without results");
+	} else {
+		event_add_str(cmd->event, "error", result->error);
+		e_error(cmd->event, "Lookup failed: %s", result->error);
+		str_append_c(str, DICT_PROTOCOL_REPLY_FAIL);
+		str_append_tabescaped(str, result->error);
+	}
+	dict_cmd_reply_handle_stats(cmd, str, cmd_stats.lookups);
+	str_append_c(str, '\n');
+
+	cmd->reply = i_strdup(str_c(str));
+	dict_connection_cmd_try_flush(&cmd);
+}
+
+static int cmd_lookup(struct dict_connection_cmd *cmd, const char *const *args)
+{
+	const char *username;
+
+	if (str_array_length(args) < 1) {
+		e_error(cmd->event, "LOOKUP: broken input");
+		return -1;
+	}
+	username = args[1];
+
+	/* <key> [<username>] */
+	dict_connection_cmd_async(cmd);
+	event_add_str(cmd->event, "key", args[0]);
+	event_add_str(cmd->event, "user", username);
+	const struct dict_op_settings set = {
+		.username = username,
+	};
+	dict_lookup_async(cmd->conn->dict, &set, args[0], cmd_lookup_callback, cmd);
+	return 1;
+}
+
+static bool dict_connection_flush_if_full(struct dict_connection *conn)
+{
+	if (o_stream_get_buffer_used_size(conn->conn.output) >
+	    DICT_OUTPUT_OPTIMAL_SIZE) {
+		if (o_stream_flush(conn->conn.output) <= 0) {
+			/* continue later when there's more space
+			   in output buffer */
+			o_stream_set_flush_pending(conn->conn.output, TRUE);
+			conn->iter_flush_pending = TRUE;
+			return FALSE;
+		}
+		/* flushed everything, continue */
+	}
+	return TRUE;
+}
+
+static void
+cmd_iterate_flush_finish(struct dict_connection_cmd *cmd, string_t *str)
+{
+	const char *error;
+
+	event_set_name(cmd->event, "dict_server_iteration_finished");
+	str_truncate(str, 0);
+	if (dict_iterate_deinit(&cmd->iter, &error) < 0) {
+		event_add_str(cmd->event, "error", error);
+		e_error(cmd->event, "dict_iterate() failed: %s", error);
+		str_printfa(str, "%c%s", DICT_PROTOCOL_REPLY_FAIL, error);
+	} else {
+		event_add_int(cmd->event, "rows", cmd->rows);
+		e_debug(cmd->event, "Iteration finished");
+	}
+	dict_cmd_reply_handle_stats(cmd, str, cmd_stats.iterations);
+	str_append_c(str, '\n');
+
+	cmd->reply = i_strdup(str_c(str));
+}
+
+static int cmd_iterate_flush(struct dict_connection_cmd *cmd)
+{
+	string_t *str = t_str_new(256);
+	const char *key, *const *values;
+
+	if (cmd->conn->destroyed) {
+		cmd_iterate_flush_finish(cmd, str);
+		return 1;
+	}
+
+	if (!dict_connection_flush_if_full(cmd->conn))
+		return 0;
+
+	while (dict_iterate_values(cmd->iter, &key, &values)) {
+		cmd->rows++;
+		str_truncate(str, 0);
+		if (cmd->async_reply_id != 0) {
+			str_append_c(str, DICT_PROTOCOL_REPLY_ASYNC_REPLY);
+			str_printfa(str, "%u\t", cmd->async_reply_id);
+		}
+		str_append_c(str, DICT_PROTOCOL_REPLY_OK);
+		str_append_tabescaped(str, key);
+		str_append_c(str, '\t');
+		if ((cmd->iter_flags & DICT_ITERATE_FLAG_NO_VALUE) == 0) {
+			str_append_tabescaped(str, values[0]);
+			for (unsigned int i = 1; values[i] != NULL; i++) {
+				str_append_c(str, '\t');
+				str_append_tabescaped(str, values[i]);
+			}
+		}
+		str_append_c(str, '\n');
+		o_stream_nsend(cmd->conn->conn.output, str_data(str), str_len(str));
+
+		if (!dict_connection_flush_if_full(cmd->conn))
+			return 0;
+	}
+	if (dict_iterate_has_more(cmd->iter)) {
+		/* wait for the next iteration callback */
+		return 0;
+	}
+
+	cmd_iterate_flush_finish(cmd, str);
+	return 1;
+}
+
+static void cmd_iterate_callback(struct dict_connection_cmd *cmd)
+{
+	struct dict_connection *conn = cmd->conn;
+
+	dict_connection_ref(conn);
+	o_stream_cork(conn->conn.output);
+	/* Don't uncork if we're just waiting for more input from the dict
+	   driver. Some dict drivers (e.g. dict-client) don't do any kind of
+	   buffering internally, so this callback can write out only a single
+	   iteration. By leaving the ostream corked it doesn't result in many
+	   tiny writes. However, we could be here also because the connection
+	   output buffer is full already, in which case don't want to leave a
+	   cork. */
+	conn->iter_flush_pending = FALSE;
+	cmd->uncork_pending = FALSE;
+	if (dict_connection_cmd_output_more(cmd)) {
+		/* NOTE: cmd may be freed now */
+		o_stream_uncork(conn->conn.output);
+	} else if (conn->iter_flush_pending) {
+		/* Don't leave the stream uncorked or we might get stuck. */
+		o_stream_uncork(conn->conn.output);
+	} else {
+		/* It's possible that the command gets finished via some other
+		   code path. To make sure this doesn't cause hangs, uncork the
+		   output when command gets freed. */
+		cmd->uncork_pending = TRUE;
+	}
+	dict_connection_unref_safe(conn);
+}
+
+static int cmd_iterate(struct dict_connection_cmd *cmd, const char *const *args)
+{
+	const char *username;
+	unsigned int flags;
+	uint64_t max_rows;
+
+	if (str_array_length(args) < 3 ||
+	    str_to_uint(args[0], &flags) < 0 ||
+	    str_to_uint64(args[1], &max_rows) < 0) {
+		e_error(cmd->event, "ITERATE: broken input");
+		return -1;
+	}
+	dict_connection_cmd_async(cmd);
+	username = args[3];
+
+	const struct dict_op_settings set = {
+		.username = username,
+	};
+
+	/* <flags> <max_rows> <path> [<username>] */
+	flags |= DICT_ITERATE_FLAG_ASYNC;
+	event_add_str(cmd->event, "key", args[2]);
+	event_add_str(cmd->event, "user", username);
+	cmd->iter = dict_iterate_init(cmd->conn->dict, &set, args[2], flags);
+	cmd->iter_flags = flags;
+	if (max_rows > 0)
+		dict_iterate_set_limit(cmd->iter, max_rows);
+	dict_iterate_set_async_callback(cmd->iter, cmd_iterate_callback, cmd);
+	(void)dict_connection_cmd_output_more(cmd);
+	return 1;
+}
+
+static struct dict_connection_transaction *
+dict_connection_transaction_lookup(struct dict_connection *conn,
+				   unsigned int id)
+{
+	struct dict_connection_transaction *transaction;
+
+	if (!array_is_created(&conn->transactions))
+		return NULL;
+
+	array_foreach_modifiable(&conn->transactions, transaction) {
+		if (transaction->id == id)
+			return transaction;
+	}
+	return NULL;
+}
+
+static void
+dict_connection_transaction_array_remove(struct dict_connection *conn,
+					 unsigned int id)
+{
+	const struct dict_connection_transaction *transactions;
+	unsigned int i, count;
+
+	transactions = array_get(&conn->transactions, &count);
+	for (i = 0; i < count; i++) {
+		if (transactions[i].id == id) {
+			i_assert(transactions[i].ctx == NULL);
+			array_delete(&conn->transactions, i, 1);
+			return;
+		}
+	}
+	i_unreached();
+}
+
+static int cmd_begin(struct dict_connection_cmd *cmd, const char *const *args)
+{
+	struct dict_connection_transaction *trans;
+	unsigned int id;
+	const char *username;
+
+	if (str_array_length(args) < 1) {
+		e_error(cmd->event, "BEGIN: broken input");
+		return -1;
+	}
+	username = args[1];
+
+	/* <id> [<username>] */
+	if (str_to_uint(args[0], &id) < 0) {
+		e_error(cmd->event, "Invalid transaction ID %s", args[0]);
+		return -1;
+	}
+	if (dict_connection_transaction_lookup(cmd->conn, id) != NULL) {
+		e_error(cmd->event, "Transaction ID %u already exists", id);
+		return -1;
+	}
+
+	if (!array_is_created(&cmd->conn->transactions))
+		i_array_init(&cmd->conn->transactions, 4);
+
+	struct dict_op_settings set = {
+		.username = username,
+	};
+	trans = array_append_space(&cmd->conn->transactions);
+	trans->id = id;
+	trans->conn = cmd->conn;
+	trans->ctx = dict_transaction_begin(cmd->conn->dict, &set);
+	return 0;
+}
+
+static int
+dict_connection_transaction_lookup_parse(struct dict_connection *conn,
+					 const char *id_str,
+					 struct dict_connection_transaction **trans_r)
+{
+	unsigned int id;
+
+	if (str_to_uint(id_str, &id) < 0) {
+		e_error(conn->conn.event, "Invalid transaction ID %s", id_str);
+		return -1;
+	}
+	*trans_r = dict_connection_transaction_lookup(conn, id);
+	if (*trans_r == NULL) {
+		e_error(conn->conn.event, "Transaction ID %u doesn't exist", id);
+		return -1;
+	}
+	return 0;
+}
+
+static void
+cmd_commit_finish(struct dict_connection_cmd *cmd,
+		  const struct dict_commit_result *result, bool async)
+{
+	string_t *str = t_str_new(64);
+	char chr;
+
+	event_set_name(cmd->event, "dict_server_transaction_finished");
+	switch (result->ret) {
+	case DICT_COMMIT_RET_OK:
+		chr = DICT_PROTOCOL_REPLY_OK;
+		break;
+	case DICT_COMMIT_RET_NOTFOUND:
+		event_add_str(cmd->event, "key_not_found", "yes");
+		chr = DICT_PROTOCOL_REPLY_NOTFOUND;
+		break;
+	case DICT_COMMIT_RET_WRITE_UNCERTAIN:
+		i_assert(result->error != NULL);
+		event_add_str(cmd->event, "write_uncertain", "yes");
+		event_add_str(cmd->event, "error", result->error);
+		chr = DICT_PROTOCOL_REPLY_WRITE_UNCERTAIN;
+		break;
+	case DICT_COMMIT_RET_FAILED:
+	default:
+		i_assert(result->error != NULL);
+		event_add_str(cmd->event, "error", result->error);
+		chr = DICT_PROTOCOL_REPLY_FAIL;
+		break;
+	}
+	if (async)
+		str_append_c(str, DICT_PROTOCOL_REPLY_ASYNC_COMMIT);
+	str_printfa(str, "%c%u", chr, cmd->trans_id);
+	if (chr != DICT_PROTOCOL_REPLY_OK &&
+	    chr != DICT_PROTOCOL_REPLY_NOTFOUND) {
+		str_append_c(str, '\t');
+		str_append_tabescaped(str, result->error);
+	}
+	dict_cmd_reply_handle_stats(cmd, str, cmd_stats.commits);
+	str_append_c(str, '\n');
+	cmd->reply = i_strdup(str_c(str));
+
+	if (result->ret < 0)
+		e_debug(cmd->event, "Transaction finished: %s", result->error);
+	else
+		e_debug(cmd->event, "Transaction finished");
+	dict_connection_transaction_array_remove(cmd->conn, cmd->trans_id);
+	dict_connection_cmd_try_flush(&cmd);
+}
+
+static void cmd_commit_callback(const struct dict_commit_result *result,
+				struct dict_connection_cmd *cmd)
+{
+	cmd_commit_finish(cmd, result, FALSE);
+}
+
+static void cmd_commit_callback_async(const struct dict_commit_result *result,
+				      struct dict_connection_cmd *cmd)
+{
+	cmd_commit_finish(cmd, result, TRUE);
+}
+
+static int
+cmd_commit(struct dict_connection_cmd *cmd, const char *const *args)
+{
+	struct dict_connection_transaction *trans;
+
+	if (dict_connection_transaction_lookup_parse(cmd->conn, args[0], &trans) < 0)
+		return -1;
+	cmd->trans_id = trans->id;
+	event_add_str(cmd->event, "user", trans->ctx->set.username);
+
+	dict_connection_cmd_async(cmd);
+	dict_transaction_commit_async(&trans->ctx, cmd_commit_callback, cmd);
+	return 1;
+}
+
+static int
+cmd_commit_async(struct dict_connection_cmd *cmd, const char *const *args)
+{
+	struct dict_connection_transaction *trans;
+
+	if (dict_connection_transaction_lookup_parse(cmd->conn, args[0], &trans) < 0)
+		return -1;
+	cmd->trans_id = trans->id;
+	event_add_str(cmd->event, "user", trans->ctx->set.username);
+
+	dict_connection_cmd_async(cmd);
+	dict_transaction_commit_async(&trans->ctx, cmd_commit_callback_async, cmd);
+	return 1;
+}
+
+static int
+cmd_rollback(struct dict_connection_cmd *cmd, const char *const *args)
+{
+	struct dict_connection_transaction *trans;
+
+	if (dict_connection_transaction_lookup_parse(cmd->conn, args[0], &trans) < 0)
+		return -1;
+
+	event_add_str(cmd->event, "user", trans->ctx->set.username);
+	dict_transaction_rollback(&trans->ctx);
+	dict_connection_transaction_array_remove(cmd->conn, trans->id);
+	return 0;
+}
+
+static int cmd_set(struct dict_connection_cmd *cmd, const char *const *args)
+{
+	struct dict_connection_transaction *trans;
+
+	/* <id> <key> <value> */
+	if (str_array_length(args) != 3) {
+		e_error(cmd->event, "SET: broken input");
+		return -1;
+	}
+
+	if (dict_connection_transaction_lookup_parse(cmd->conn, args[0], &trans) < 0)
+		return -1;
+	event_add_str(cmd->event, "user", trans->ctx->set.username);
+        dict_set(trans->ctx, args[1], args[2]);
+	return 0;
+}
+
+static int cmd_unset(struct dict_connection_cmd *cmd, const char *const *args)
+{
+	struct dict_connection_transaction *trans;
+
+	/* <id> <key> */
+	if (str_array_length(args) != 2) {
+		e_error(cmd->event, "UNSET: broken input");
+		return -1;
+	}
+
+	if (dict_connection_transaction_lookup_parse(cmd->conn, args[0], &trans) < 0)
+		return -1;
+        dict_unset(trans->ctx, args[1]);
+	return 0;
+}
+
+static int
+cmd_atomic_inc(struct dict_connection_cmd *cmd, const char *const *args)
+{
+	struct dict_connection_transaction *trans;
+	long long diff;
+
+	/* <id> <key> <diff> */
+	if (str_array_length(args) != 3 ||
+	    str_to_llong(args[2], &diff) < 0) {
+		e_error(cmd->event, "ATOMIC_INC: broken input");
+		return -1;
+	}
+
+	if (dict_connection_transaction_lookup_parse(cmd->conn, args[0], &trans) < 0)
+		return -1;
+
+        dict_atomic_inc(trans->ctx, args[1], diff);
+	return 0;
+}
+
+static int cmd_timestamp(struct dict_connection_cmd *cmd, const char *const *args)
+{
+	struct dict_connection_transaction *trans;
+	long long tv_sec;
+	unsigned int tv_nsec;
+
+	/* <id> <secs> <nsecs> */
+	if (str_array_length(args) != 3 ||
+	    str_to_llong(args[1], &tv_sec) < 0 ||
+	    str_to_uint(args[2], &tv_nsec) < 0) {
+		e_error(cmd->event, "TIMESTAMP: broken input");
+		return -1;
+	}
+
+	if (dict_connection_transaction_lookup_parse(cmd->conn, args[0], &trans) < 0)
+		return -1;
+
+	struct timespec ts = {
+		.tv_sec = tv_sec,
+		.tv_nsec = tv_nsec
+	};
+        dict_transaction_set_timestamp(trans->ctx, &ts);
+	return 0;
+}
+
+static int
+cmd_hide_log_values(struct dict_connection_cmd *cmd, const char *const *args)
+{
+	struct dict_connection_transaction *trans;
+	bool value;
+
+	/* <id> <hide_log_values> */
+	if (str_array_length(args) != 2 ) {
+		e_error(cmd->event, "HIDE_LOG_VALUES: broken input");
+		return -1;
+	}
+	if (strcasecmp(args[1], "yes") == 0 || strcasecmp(args[1], "y") == 0 ||
+	    strcmp(args[1], "1") == 0)
+		value = TRUE;
+	else if (strcasecmp(args[1], "no") == 0)
+		value = FALSE;
+	else {
+		e_error(cmd->event, "HIDE_LOG_VALUES: broken input");
+		return -1;
+	}
+
+	if (dict_connection_transaction_lookup_parse(cmd->conn, args[0], &trans) < 0)
+		return -1;
+
+	dict_transaction_set_hide_log_values(trans->ctx, value);
+	return 0;
+}
+
+static const struct dict_cmd_func cmds[] = {
+	{ DICT_PROTOCOL_CMD_LOOKUP, cmd_lookup },
+	{ DICT_PROTOCOL_CMD_ITERATE, cmd_iterate },
+	{ DICT_PROTOCOL_CMD_BEGIN, cmd_begin },
+	{ DICT_PROTOCOL_CMD_COMMIT, cmd_commit },
+	{ DICT_PROTOCOL_CMD_COMMIT_ASYNC, cmd_commit_async },
+	{ DICT_PROTOCOL_CMD_ROLLBACK, cmd_rollback },
+	{ DICT_PROTOCOL_CMD_SET, cmd_set },
+	{ DICT_PROTOCOL_CMD_UNSET, cmd_unset },
+	{ DICT_PROTOCOL_CMD_ATOMIC_INC, cmd_atomic_inc },
+	{ DICT_PROTOCOL_CMD_TIMESTAMP, cmd_timestamp },
+	{ DICT_PROTOCOL_CMD_HIDE_LOG_VALUES, cmd_hide_log_values },
+
+	{ 0, NULL }
+};
+
+static const struct dict_cmd_func *dict_command_find(enum dict_protocol_cmd cmd)
+{
+	unsigned int i;
+
+	for (i = 0; cmds[i].cmd != '\0'; i++) {
+		if (cmds[i].cmd == cmd)
+			return &cmds[i];
+	}
+	return NULL;
+}
+
+int dict_command_input(struct dict_connection *conn, const char *line)
+{
+	const struct dict_cmd_func *cmd_func;
+	struct dict_connection_cmd *cmd;
+	int ret;
+	const char *const *args;
+
+	cmd_func = dict_command_find((enum dict_protocol_cmd)*line);
+	if (cmd_func == NULL) {
+		e_error(conn->conn.event, "Unknown command %c", *line);
+		return -1;
+	}
+
+	cmd = i_new(struct dict_connection_cmd, 1);
+	cmd->conn = conn;
+	cmd->event = event_create(cmd->conn->conn.event);
+	cmd->cmd = cmd_func;
+	cmd->start_timeval = ioloop_timeval;
+	array_push_back(&conn->cmds, &cmd);
+	dict_connection_ref(conn);
+
+	args = t_strsplit_tabescaped(line + 1);
+	if ((ret = cmd_func->func(cmd, args)) <= 0) {
+		dict_connection_cmd_remove(cmd);
+		return ret;
+	}
+	return 0;
+}
+
+static bool dict_connection_cmds_try_output_more(struct dict_connection *conn)
+{
+	struct dict_connection_cmd *cmd;
+
+	/* only iterators may be returning a lot of data */
+	array_foreach_elem(&conn->cmds, cmd) {
+		if (cmd->iter == NULL) {
+			/* not an iterator */
+		} else if (cmd_iterate_flush(cmd) == 0) {
+			/* unfinished */
+		} else {
+			dict_connection_cmd_try_flush(&cmd);
+			/* cmd should be freed now, restart output */
+			return TRUE;
+		}
+		if (conn->conn.minor_version < DICT_CLIENT_PROTOCOL_TIMINGS_MIN_VERSION)
+			break;
+		/* try to flush the rest */
+	}
+	return FALSE;
+}
+
+void dict_connection_cmds_output_more(struct dict_connection *conn)
+{
+	while (array_count(&conn->cmds) > 0) {
+		if (!dict_connection_cmds_try_output_more(conn))
+			break;
+	}
+}
+
+static bool dict_connection_cmd_output_more(struct dict_connection_cmd *cmd)
+{
+	struct dict_connection_cmd *const *first_cmdp;
+
+	if (cmd->conn->conn.minor_version < DICT_CLIENT_PROTOCOL_TIMINGS_MIN_VERSION) {
+		first_cmdp = array_front(&cmd->conn->cmds);
+		if (*first_cmdp != cmd)
+			return TRUE;
+	}
+	return dict_connection_cmds_try_output_more(cmd->conn);
+}
+
+void dict_commands_init(void)
+{
+	cmd_stats.lookups = stats_dist_init();
+	cmd_stats.iterations = stats_dist_init();
+	cmd_stats.commits = stats_dist_init();
+}
+
+void dict_commands_deinit(void)
+{
+	stats_dist_deinit(&cmd_stats.lookups);
+	stats_dist_deinit(&cmd_stats.iterations);
+	stats_dist_deinit(&cmd_stats.commits);
+}
diff --git a/src/dict/dict-commands.h b/src/dict/dict-commands.h
new file mode 100644
index 0000000..ce4a04f
--- /dev/null
+++ b/src/dict/dict-commands.h
@@ -0,0 +1,21 @@
+#ifndef DICT_COMMANDS_H
+#define DICT_COMMANDS_H
+
+struct dict_connection;
+
+struct dict_command_stats {
+	struct stats_dist *lookups;
+	struct stats_dist *iterations;
+	struct stats_dist *commits;
+};
+
+extern struct dict_command_stats cmd_stats;
+
+int dict_command_input(struct dict_connection *conn, const char *line);
+
+void dict_connection_cmds_output_more(struct dict_connection *conn);
+
+void dict_commands_init(void);
+void dict_commands_deinit(void);
+
+#endif
diff --git a/src/dict/dict-connection.c b/src/dict/dict-connection.c
new file mode 100644
index 0000000..6a87c27
--- /dev/null
+++ b/src/dict/dict-connection.c
@@ -0,0 +1,272 @@
+/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "ioloop.h"
+#include "istream.h"
+#include "ostream.h"
+#include "llist.h"
+#include "strescape.h"
+#include "master-service.h"
+#include "dict-client.h"
+#include "dict-settings.h"
+#include "dict-commands.h"
+#include "dict-connection.h"
+#include "dict-init-cache.h"
+
+#include <unistd.h>
+
+#define DICT_CONN_MAX_PENDING_COMMANDS 1000
+
+static int dict_connection_dict_init(struct dict_connection *conn);
+static void dict_connection_destroy(struct connection *_conn);
+struct connection_list *dict_connections = NULL;
+
+static  struct event_category dict_server_event_category = {
+	.name = "dict-server",
+};
+
+static int dict_connection_handshake_args(struct connection *_conn,
+					  const char *const *args)
+{
+	unsigned int major, value_type_num;
+	struct dict_connection *conn =
+		container_of(_conn, struct dict_connection, conn);
+
+	/* protocol handshake is Hmajor minor value_type */
+	if (str_array_length(args) < 5 || **args != 'H')
+		return -1;
+
+	/* check major version which comes right after 'H' in the
+	   first parameter, store minor version. */
+	if (str_to_uint(args[0]+1, &major) < 0 ||
+	    str_to_uint(args[1], &conn->conn.minor_version) < 0 ||
+	    major != DICT_CLIENT_PROTOCOL_MAJOR_VERSION)
+		return -1;
+
+	/* check value type */
+	if (str_to_uint(args[2], &value_type_num) < 0 ||
+	    value_type_num >= DICT_DATA_TYPE_LAST)
+		return -1;
+
+	conn->value_type = (enum dict_data_type)value_type_num;
+	conn->name = i_strdup(args[4]);
+
+	/* try initialize the given dict */
+	if (dict_connection_dict_init(conn) < 0)
+		return -1;
+
+	return 1;
+}
+
+static int dict_connection_handshake_line(struct connection *conn,
+					  const char *line)
+{
+	const char *const *args = t_strsplit_tabescaped(line);
+	return dict_connection_handshake_args(conn, args);
+}
+
+static int dict_connection_dict_init(struct dict_connection *conn)
+{
+	struct dict_settings dict_set;
+	const char *const *strlist;
+	unsigned int i, count;
+	const char *uri, *error;
+
+	if (!array_is_created(&dict_settings->dicts)) {
+		e_error(conn->conn.event, "No dictionaries configured");
+		return -1;
+	}
+	strlist = array_get(&dict_settings->dicts, &count);
+	for (i = 0; i < count; i += 2) {
+		if (strcmp(strlist[i], conn->name) == 0)
+			break;
+	}
+
+	if (i == count) {
+		e_error(conn->conn.event, "Unconfigured dictionary name '%s'",
+			conn->name);
+		return -1;
+	}
+	event_set_append_log_prefix(conn->conn.event,
+				    t_strdup_printf("%s: ", conn->name));
+	event_add_str(conn->conn.event, "dict_name", conn->name);
+	uri = strlist[i+1];
+
+	i_zero(&dict_set);
+	dict_set.base_dir = dict_settings->base_dir;
+	dict_set.event_parent = conn->conn.event;
+	if (dict_init_cache_get(conn->name, uri, &dict_set, &conn->dict, &error) < 0) {
+		/* dictionary initialization failed */
+		e_error(conn->conn.event, "Failed to initialize dictionary '%s': %s",
+			conn->name, error);
+		return -1;
+	}
+	return 0;
+}
+
+static int dict_connection_output(struct connection *_conn)
+{
+	struct dict_connection *conn = container_of(_conn, struct dict_connection, conn);
+	int ret;
+
+	if ((ret = o_stream_flush(conn->conn.output)) < 0) {
+		dict_connection_destroy(&conn->conn);
+		return 1;
+	}
+	if (ret > 0)
+		dict_connection_cmds_output_more(conn);
+	return ret;
+}
+
+struct dict_connection *
+dict_connection_create(struct master_service_connection *master_conn)
+{
+	struct dict_connection *conn;
+
+	conn = i_new(struct dict_connection, 1);
+	conn->refcount = 1;
+
+	connection_init_server(dict_connections, &conn->conn, master_conn->name,
+			       master_conn->fd, master_conn->fd);
+	event_add_category(conn->conn.event, &dict_server_event_category);
+
+	o_stream_set_flush_callback(conn->conn.output, dict_connection_output,
+				    &conn->conn);
+
+	i_array_init(&conn->cmds, DICT_CONN_MAX_PENDING_COMMANDS);
+
+	return conn;
+}
+
+void dict_connection_ref(struct dict_connection *conn)
+{
+	i_assert(conn->refcount > 0);
+	conn->refcount++;
+}
+
+bool dict_connection_unref(struct dict_connection *conn)
+{
+	struct dict_connection_transaction *transaction;
+
+	i_assert(conn->refcount > 0);
+	if (--conn->refcount > 0)
+		return TRUE;
+
+	i_assert(array_count(&conn->cmds) == 0);
+
+	/* we should have only transactions that haven't been committed or
+	   rollbacked yet. close those before dict is deinitialized. */
+	if (array_is_created(&conn->transactions)) {
+		array_foreach_modifiable(&conn->transactions, transaction)
+			dict_transaction_rollback(&transaction->ctx);
+	}
+
+	if (conn->dict != NULL)
+		dict_init_cache_unref(&conn->dict);
+
+	if (array_is_created(&conn->transactions))
+		array_free(&conn->transactions);
+
+	array_free(&conn->cmds);
+
+	connection_deinit(&conn->conn);
+
+	i_free(conn->name);
+	i_free(conn);
+
+	master_service_client_connection_destroyed(master_service);
+	return FALSE;
+}
+
+static int dict_connection_input_line(struct connection *_conn, const char *line)
+{
+	struct dict_connection *conn =
+		container_of(_conn, struct dict_connection, conn);
+
+	i_assert(conn->dict != NULL);
+
+	if (dict_command_input(conn, line) < 0)
+		return -1;
+
+	if (array_count(&conn->cmds) >= DICT_CONN_MAX_PENDING_COMMANDS) {
+		connection_input_halt(_conn);
+		return 0;
+	}
+
+	return 1;
+}
+
+static void dict_connection_unref_safe_callback(struct dict_connection *conn)
+{
+	timeout_remove(&conn->to_unref);
+	(void)dict_connection_unref(conn);
+}
+
+void dict_connection_unref_safe(struct dict_connection *conn)
+{
+	if (conn->refcount == 1) {
+		/* delayed unref to make sure we don't try to call
+		   dict_deinit() from a dict-callback. that's too much trouble
+		   for each dict driver to be able to handle. */
+		if (conn->to_unref == NULL) {
+			conn->to_unref = timeout_add_short(0,
+				dict_connection_unref_safe_callback, conn);
+		}
+	} else {
+		(void)dict_connection_unref(conn);
+	}
+}
+
+static void dict_connection_destroy(struct connection *_conn)
+{
+	struct dict_connection *conn = container_of(_conn, struct dict_connection, conn);
+
+	/* If there are commands still running, we delay disconnecting can may
+	   come back here. Track this so we unreference the connection only
+	   once. */
+	if (conn->destroyed)
+		return;
+	conn->destroyed = TRUE;
+
+	/* the connection is closed, but there may still be commands left
+	   running. finish them, even if the calling client can't be notified
+	   about whether they succeeded (clients may not even care).
+
+	   flush the command output here in case we were waiting on iteration
+	   output. */
+	i_stream_close(conn->conn.input);
+	o_stream_close(conn->conn.output);
+	dict_connection_cmds_output_more(conn);
+
+	io_remove(&conn->conn.io);
+	dict_connection_unref(conn);
+}
+
+unsigned int dict_connections_current_count(void)
+{
+	return dict_connections->connections_count;
+}
+
+void dict_connections_destroy_all(void)
+{
+	connection_list_deinit(&dict_connections);
+}
+
+static struct connection_settings dict_connections_set = {
+	.dont_send_version = TRUE,
+	.input_max_size = DICT_CLIENT_MAX_LINE_LENGTH,
+	.output_max_size = 128*1024,
+};
+
+static struct connection_vfuncs dict_connections_vfuncs = {
+	.destroy = dict_connection_destroy,
+	.handshake_line = dict_connection_handshake_line,
+	.input_line = dict_connection_input_line,
+};
+
+void dict_connections_init(void)
+{
+	dict_connections = connection_list_init(&dict_connections_set,
+						&dict_connections_vfuncs);
+}
diff --git a/src/dict/dict-connection.h b/src/dict/dict-connection.h
new file mode 100644
index 0000000..2241dad
--- /dev/null
+++ b/src/dict/dict-connection.h
@@ -0,0 +1,48 @@
+#ifndef DICT_CONNECTION_H
+#define DICT_CONNECTION_H
+
+#include "dict.h"
+#include "connection.h"
+
+struct dict_connection_transaction {
+	unsigned int id;
+	struct dict_connection *conn;
+	struct dict_transaction_context *ctx;
+};
+
+struct dict_connection {
+	struct connection conn;
+	struct dict_connection *prev, *next;
+	struct dict_server *server;
+	int refcount;
+
+	char *name;
+	struct dict *dict;
+	enum dict_data_type value_type;
+
+	struct timeout *to_unref;
+
+	/* There are only a few transactions per client, so keeping them in
+	   array is fast enough */
+	ARRAY(struct dict_connection_transaction) transactions;
+	ARRAY(struct dict_connection_cmd *) cmds;
+	unsigned int async_id_counter;
+
+	bool iter_flush_pending;
+	bool destroyed;
+};
+
+struct master_service_connection;
+
+struct dict_connection *
+dict_connection_create(struct master_service_connection *master_conn);
+
+void dict_connection_ref(struct dict_connection *conn);
+bool dict_connection_unref(struct dict_connection *conn);
+void dict_connection_unref_safe(struct dict_connection *conn);
+
+unsigned int dict_connections_current_count(void);
+void dict_connections_init(void);
+void dict_connections_destroy_all(void);
+
+#endif
diff --git a/src/dict/dict-init-cache.c b/src/dict/dict-init-cache.c
new file mode 100644
index 0000000..ed76940
--- /dev/null
+++ b/src/dict/dict-init-cache.c
@@ -0,0 +1,164 @@
+/* Copyright (c) 2021 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "dict.h"
+#include "dict-private.h"
+#include "dict-init-cache.h"
+#include "llist.h"
+
+/* How many seconds to keep dict opened for reuse after it's been closed */
+#define DICT_CACHE_TIMEOUT_SECS 30
+/* How many closed dicts to keep */
+#define DICT_CACHE_MAX_COUNT 10
+
+struct dict_init_cache_list {
+	struct dict_init_cache_list *prev, *next;
+
+	struct dict *dict;
+	char *dict_name;
+	int refcount;
+
+	time_t destroy_time;
+};
+
+static struct dict_init_cache_list *dicts = NULL;
+static struct timeout *to_dict = NULL;
+
+static struct dict_init_cache_list *
+dict_init_cache_add(const char *dict_name, struct dict *dict)
+{
+	struct dict_init_cache_list *list;
+
+	list = i_new(struct dict_init_cache_list, 1);
+	list->refcount = 1;
+	list->dict = dict;
+	list->dict_name = i_strdup(dict_name);
+
+	DLLIST_PREPEND(&dicts, list);
+
+	return list;
+}
+
+static void dict_init_cache_list_free(struct dict_init_cache_list *list)
+{
+	i_assert(list->refcount == 0);
+
+	DLLIST_REMOVE(&dicts, list);
+	dict_deinit(&list->dict);
+	i_free(list->dict_name);
+	i_free(list);
+}
+
+static struct dict_init_cache_list *dict_init_cache_find(const char *dict_name)
+{
+	struct dict_init_cache_list *listp = dicts, *next = NULL, *match = NULL;
+	unsigned int ref0_count = 0;
+
+	while (listp != NULL) {
+                next = listp->next;
+		if (match != NULL) {
+			/* already found the dict. we're just going through
+			   the rest of them to drop 0 refcounts */
+		} else if (strcmp(dict_name, listp->dict_name) == 0)
+			match = listp;
+
+		if (listp->refcount == 0 && listp != match) {
+			if (listp->destroy_time <= ioloop_time ||
+			    ref0_count >= DICT_CACHE_MAX_COUNT - 1)
+				dict_init_cache_list_free(listp);
+			else
+				ref0_count++;
+		}
+                listp = next;
+	}
+	return match;
+}
+
+int dict_init_cache_get(const char *dict_name, const char *uri,
+			const struct dict_settings *set,
+			struct dict **dict_r, const char **error_r)
+{
+	struct dict_init_cache_list *match;
+	int ret = 0;
+
+	match = dict_init_cache_find(dict_name);
+	if (match == NULL) {
+		if (dict_init(uri, set, dict_r, error_r) < 0)
+			return -1;
+		match = dict_init_cache_add(dict_name, *dict_r);
+	} else {
+		match->refcount++;
+		*dict_r = match->dict;
+	}
+	i_assert(match->dict != NULL);
+	return ret;
+}
+
+static void destroy_unrefed(void)
+{
+	struct dict_init_cache_list *listp, *next = NULL;
+	bool seen_ref0 = FALSE;
+
+	for (listp = dicts; listp != NULL; listp = next) {
+		next = listp->next;
+
+		i_assert(listp->refcount >= 0);
+		if (listp->refcount > 0)
+			;
+		else if (listp->destroy_time <= ioloop_time)
+			dict_init_cache_list_free(listp);
+		else
+			seen_ref0 = TRUE;
+	}
+
+	if (!seen_ref0 && to_dict != NULL)
+		timeout_remove(&to_dict);
+}
+
+static void dict_removal_timeout(void *context ATTR_UNUSED)
+{
+	destroy_unrefed();
+}
+
+void dict_init_cache_unref(struct dict **_dict)
+{
+	struct dict *dict = *_dict;
+	struct dict_init_cache_list *listp;
+
+	if (dict == NULL)
+		return;
+
+	*_dict = NULL;
+	for (listp = dicts; listp != NULL; listp = listp->next) {
+		if (listp->dict == dict)
+			break;
+	}
+
+	i_assert(listp != NULL && listp->dict == dict);
+	i_assert(listp->refcount > 0);
+
+	listp->refcount--;
+	listp->destroy_time = ioloop_time + DICT_CACHE_TIMEOUT_SECS;
+
+	if (to_dict == NULL) {
+		to_dict = timeout_add_to(io_loop_get_root(),
+					 DICT_CACHE_TIMEOUT_SECS*1000/2,
+					 dict_removal_timeout, NULL);
+	}
+}
+
+void dict_init_cache_wait_all(void)
+{
+	struct dict_init_cache_list *listp;
+
+	for (listp = dicts; listp != NULL; listp = listp->next)
+		dict_wait(listp->dict);
+}
+
+void dict_init_cache_destroy_all(void)
+{
+	timeout_remove(&to_dict);
+	while (dicts != NULL)
+		dict_init_cache_list_free(dicts);
+}
diff --git a/src/dict/dict-init-cache.h b/src/dict/dict-init-cache.h
new file mode 100644
index 0000000..1342ca3
--- /dev/null
+++ b/src/dict/dict-init-cache.h
@@ -0,0 +1,12 @@
+#ifndef DICT_INIT_CACHE_H
+#define DICT_INIT_CACHE_H
+
+int dict_init_cache_get(const char *dict_name, const char *uri,
+			const struct dict_settings *set,
+			struct dict **dict_r, const char **error_r);
+void dict_init_cache_unref(struct dict **dict);
+
+void dict_init_cache_wait_all(void);
+void dict_init_cache_destroy_all(void);
+
+#endif
diff --git a/src/dict/dict-settings.c b/src/dict/dict-settings.c
new file mode 100644
index 0000000..23c33f6
--- /dev/null
+++ b/src/dict/dict-settings.c
@@ -0,0 +1,117 @@
+/* Copyright (c) 2009-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "buffer.h"
+#include "settings-parser.h"
+#include "service-settings.h"
+#include "dict-settings.h"
+
+/* <settings checks> */
+static struct file_listener_settings dict_unix_listeners_array[] = {
+	{ "dict", 0660, "", "$default_internal_group" }
+};
+static struct file_listener_settings *dict_unix_listeners[] = {
+	&dict_unix_listeners_array[0]
+};
+static buffer_t dict_unix_listeners_buf = {
+	{ { dict_unix_listeners, sizeof(dict_unix_listeners) } }
+};
+
+static struct file_listener_settings dict_async_unix_listeners_array[] = {
+	{ "dict-async", 0660, "", "$default_internal_group" }
+};
+static struct file_listener_settings *dict_async_unix_listeners[] = {
+	&dict_async_unix_listeners_array[0]
+};
+static buffer_t dict_async_unix_listeners_buf = {
+	{ { dict_async_unix_listeners, sizeof(dict_async_unix_listeners) } }
+};
+/* </settings checks> */
+
+struct service_settings dict_service_settings = {
+	.name = "dict",
+	.protocol = "",
+	.type = "",
+	.executable = "dict",
+	.user = "$default_internal_user",
+	.group = "",
+	.privileged_group = "",
+	.extra_groups = "",
+	.chroot = "",
+
+	.drop_priv_before_exec = FALSE,
+
+	.process_min_avail = 0,
+	.process_limit = 0,
+	.client_limit = 1,
+	.service_count = 0,
+	.idle_kill = 0,
+	.vsz_limit = UOFF_T_MAX,
+
+	.unix_listeners = { { &dict_unix_listeners_buf,
+			      sizeof(dict_unix_listeners[0]) } },
+	.fifo_listeners = ARRAY_INIT,
+	.inet_listeners = ARRAY_INIT
+};
+
+struct service_settings dict_async_service_settings = {
+	.name = "dict-async",
+	.protocol = "",
+	.type = "",
+	.executable = "dict",
+	.user = "$default_internal_user",
+	.group = "",
+	.privileged_group = "",
+	.extra_groups = "",
+	.chroot = "",
+
+	.drop_priv_before_exec = FALSE,
+
+	.process_min_avail = 0,
+	.process_limit = 0,
+	.client_limit = 0,
+	.service_count = 0,
+	.idle_kill = 0,
+	.vsz_limit = UOFF_T_MAX,
+
+	.unix_listeners = { { &dict_async_unix_listeners_buf,
+			      sizeof(dict_async_unix_listeners[0]) } },
+	.fifo_listeners = ARRAY_INIT,
+	.inet_listeners = ARRAY_INIT
+};
+
+#undef DEF
+#define DEF(type, name) \
+	SETTING_DEFINE_STRUCT_##type(#name, name, struct dict_server_settings)
+
+static const struct setting_define dict_setting_defines[] = {
+	DEF(STR, base_dir),
+	DEF(BOOL, verbose_proctitle),
+
+	DEF(STR, dict_db_config),
+	{ .type = SET_STRLIST, .key = "dict",
+	  .offset = offsetof(struct dict_server_settings, dicts) },
+
+	SETTING_DEFINE_LIST_END
+};
+
+const struct dict_server_settings dict_default_settings = {
+	.base_dir = PKG_RUNDIR,
+	.verbose_proctitle = FALSE,
+
+	.dict_db_config = "",
+	.dicts = ARRAY_INIT
+};
+
+const struct setting_parser_info dict_setting_parser_info = {
+	.module_name = "dict",
+	.defines = dict_setting_defines,
+	.defaults = &dict_default_settings,
+
+	.type_offset = SIZE_MAX,
+	.struct_size = sizeof(struct dict_server_settings),
+
+	.parent_offset = SIZE_MAX
+};
+
+const struct dict_server_settings *dict_settings;
diff --git a/src/dict/dict-settings.h b/src/dict/dict-settings.h
new file mode 100644
index 0000000..3c37589
--- /dev/null
+++ b/src/dict/dict-settings.h
@@ -0,0 +1,15 @@
+#ifndef DICT_SETTINGS_H
+#define DICT_SETTINGS_H
+
+struct dict_server_settings {
+	const char *base_dir;
+	bool verbose_proctitle;
+
+	const char *dict_db_config;
+	ARRAY(const char *) dicts;
+};
+
+extern const struct setting_parser_info dict_setting_parser_info;
+extern const struct dict_server_settings *dict_settings;
+
+#endif
diff --git a/src/dict/main.c b/src/dict/main.c
new file mode 100644
index 0000000..14b1cea
--- /dev/null
+++ b/src/dict/main.c
@@ -0,0 +1,179 @@
+/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "restrict-access.h"
+#include "ioloop.h"
+#include "randgen.h"
+#include "str.h"
+#include "stats-dist.h"
+#include "process-title.h"
+#include "env-util.h"
+#include "module-dir.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "sql-api.h"
+#include "dict.h"
+#include "dict-client.h"
+#include "dict-commands.h"
+#include "dict-connection.h"
+#include "dict-settings.h"
+#include "dict-init-cache.h"
+#include "main.h"
+
+#include <math.h>
+
+static struct module *modules;
+static struct timeout *to_proctitle;
+static bool proctitle_updated;
+static struct ioloop *main_ioloop;
+
+static void
+add_stats_string(string_t *str, struct stats_dist *stats, const char *name)
+{
+	uint64_t min, max, p95;
+	double avg;
+
+	min = stats_dist_get_min(stats);
+	avg = stats_dist_get_avg(stats);
+	p95 = stats_dist_get_95th(stats);
+	max = stats_dist_get_max(stats);
+
+	str_printfa(str, ", %u %s:%llu/%lld/%llu/%llu",
+		    stats_dist_get_count(stats), name,
+		    (unsigned long long)min/1000, llrint(avg/1000),
+		    (unsigned long long)p95/1000,
+		    (unsigned long long)max/1000);
+	stats_dist_reset(stats);
+}
+
+static void dict_proctitle_update(void *context ATTR_UNUSED)
+{
+	string_t *str = t_str_new(128);
+
+	if (!proctitle_updated)
+		timeout_remove(&to_proctitle);
+
+	str_printfa(str, "[%u clients", dict_connections_current_count());
+
+	add_stats_string(str, cmd_stats.lookups, "lookups");
+	add_stats_string(str, cmd_stats.iterations, "iters");
+	add_stats_string(str, cmd_stats.commits, "commits");
+	str_append_c(str, ']');
+
+	process_title_set(str_c(str));
+	proctitle_updated = FALSE;
+}
+
+void dict_proctitle_update_later(void)
+{
+	if (!dict_settings->verbose_proctitle)
+		return;
+
+	if (to_proctitle == NULL)
+		to_proctitle = timeout_add_to(main_ioloop, 1000, dict_proctitle_update, NULL);
+	proctitle_updated = TRUE;
+}
+
+static void dict_die(void)
+{
+	/* hope that other processes relying on us will die first. */
+}
+
+static void client_connected(struct master_service_connection *conn)
+{
+	master_service_client_connection_accept(conn);
+	(void)dict_connection_create(conn);
+}
+
+static void main_preinit(void)
+{
+	/* Load built-in SQL drivers (if any) */
+	sql_drivers_init();
+	sql_drivers_register_all();
+#ifdef HAVE_CDB
+	dict_driver_register(&dict_driver_cdb);
+#endif
+
+	restrict_access_by_env(RESTRICT_ACCESS_FLAG_ALLOW_ROOT, NULL);
+	restrict_access_allow_coredumps(TRUE);
+}
+
+static void main_init(void)
+{
+	struct module_dir_load_settings mod_set;
+	void **sets;
+
+	sets = master_service_settings_get_others(master_service);
+	dict_settings = sets[0];
+
+	if (*dict_settings->dict_db_config != '\0') {
+		/* for berkeley db library */
+		env_put("DB_CONFIG", dict_settings->dict_db_config);
+	}
+
+	i_zero(&mod_set);
+	mod_set.abi_version = DOVECOT_ABI_VERSION;
+	mod_set.require_init_funcs = TRUE;
+
+	modules = module_dir_load(DICT_MODULE_DIR, NULL, &mod_set);
+	module_dir_init(modules);
+
+	/* Register only after loading modules. They may contain SQL drivers,
+	   which we'll need to register. */
+	dict_drivers_register_all();
+	dict_commands_init();
+	dict_connections_init();
+
+	if (dict_settings->verbose_proctitle)
+		dict_proctitle_update(NULL);
+}
+
+static void main_deinit(void)
+{
+	/* wait for all dict operations to finish */
+	dict_init_cache_wait_all();
+	/* connections should no longer have any extra refcounts */
+	dict_connections_destroy_all();
+	dict_init_cache_destroy_all();
+
+	dict_drivers_unregister_all();
+	dict_commands_deinit();
+
+	module_dir_unload(&modules);
+
+	sql_drivers_deinit();
+	timeout_remove(&to_proctitle);
+}
+
+int main(int argc, char *argv[])
+{
+	const enum master_service_flags service_flags = 0;
+	const struct setting_parser_info *set_roots[] = {
+		&dict_setting_parser_info,
+		NULL
+	};
+	const char *error;
+
+	master_service = master_service_init("dict", service_flags,
+					     &argc, &argv, "");
+	if (master_getopt(master_service) > 0)
+		return FATAL_DEFAULT;
+
+	if (master_service_settings_read_simple(master_service, set_roots,
+						&error) < 0)
+		i_fatal("Error reading configuration: %s", error);
+
+	master_service_init_log_with_pid(master_service);
+	main_preinit();
+	master_service_set_die_callback(master_service, dict_die);
+
+	main_ioloop = current_ioloop;
+	main_init();
+	master_service_init_finish(master_service);
+	master_service_run(master_service, client_connected);
+
+	/* clean up cached dicts */
+	main_deinit();
+	master_service_deinit(&master_service);
+        return 0;
+}
diff --git a/src/dict/main.h b/src/dict/main.h
new file mode 100644
index 0000000..e505e13
--- /dev/null
+++ b/src/dict/main.h
@@ -0,0 +1,6 @@
+#ifndef MAIN_H
+#define MAIN_H
+
+void dict_proctitle_update_later(void);
+
+#endif