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

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

29 files changed, 5588 insertions, 0 deletions

diff --git a/src/replication/Makefile.am b/src/replication/Makefile.am
new file mode 100644
index 0000000..c9ddbd0
--- /dev/null
+++ b/src/replication/Makefile.am
@@ -0,0 +1,4 @@
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+
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+	replication-common.h
diff --git a/src/replication/Makefile.in b/src/replication/Makefile.in
new file mode 100644
index 0000000..a9dd5bb
--- /dev/null
+++ b/src/replication/Makefile.in
@@ -0,0 +1,773 @@
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+	-I$(top_srcdir)/src/replication \
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diff --git a/src/replication/aggregator/Makefile.in b/src/replication/aggregator/Makefile.in
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+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    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; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(PROGRAMS) $(HEADERS)
+installdirs:
+	for dir in "$(DESTDIR)$(pkglibexecdir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(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
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-pkglibexecPROGRAMS \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/aggregator-settings.Po
+	-rm -f ./$(DEPDIR)/aggregator.Po
+	-rm -f ./$(DEPDIR)/notify-connection.Po
+	-rm -f ./$(DEPDIR)/replicator-connection.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am: install-pkglibexecPROGRAMS
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/aggregator-settings.Po
+	-rm -f ./$(DEPDIR)/aggregator.Po
+	-rm -f ./$(DEPDIR)/notify-connection.Po
+	-rm -f ./$(DEPDIR)/replicator-connection.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-pkglibexecPROGRAMS
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-pkglibexecPROGRAMS \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-pkglibexecPROGRAMS install-ps \
+	install-ps-am install-strip installcheck installcheck-am \
+	installdirs maintainer-clean maintainer-clean-generic \
+	mostlyclean mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool pdf pdf-am ps ps-am tags tags-am uninstall \
+	uninstall-am uninstall-pkglibexecPROGRAMS
+
+.PRECIOUS: Makefile
+
+
+# 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/replication/aggregator/aggregator-settings.c b/src/replication/aggregator/aggregator-settings.c
new file mode 100644
index 0000000..98597bd
--- /dev/null
+++ b/src/replication/aggregator/aggregator-settings.c
@@ -0,0 +1,85 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "buffer.h"
+#include "settings-parser.h"
+#include "service-settings.h"
+#include "aggregator-settings.h"
+
+/* <settings checks> */
+static struct file_listener_settings aggregator_unix_listeners_array[] = {
+	{ "replication-notify", 0600, "", "" }
+};
+static struct file_listener_settings *aggregator_unix_listeners[] = {
+	&aggregator_unix_listeners_array[0]
+};
+static buffer_t aggregator_unix_listeners_buf = {
+	{ { aggregator_unix_listeners, sizeof(aggregator_unix_listeners) } }
+};
+
+static struct file_listener_settings aggregator_fifo_listeners_array[] = {
+	{ "replication-notify-fifo", 0600, "", "" }
+};
+static struct file_listener_settings *aggregator_fifo_listeners[] = {
+	&aggregator_fifo_listeners_array[0]
+};
+static buffer_t aggregator_fifo_listeners_buf = {
+	{ { aggregator_fifo_listeners, sizeof(aggregator_fifo_listeners) } }
+};
+/* </settings checks> */
+
+struct service_settings aggregator_service_settings = {
+	.name = "aggregator",
+	.protocol = "",
+	.type = "",
+	.executable = "aggregator",
+	.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 = { { &aggregator_unix_listeners_buf,
+			      sizeof(aggregator_unix_listeners[0]) } },
+	.fifo_listeners = { { &aggregator_fifo_listeners_buf,
+			      sizeof(aggregator_fifo_listeners[0]) } },
+	.inet_listeners = ARRAY_INIT
+};
+
+#undef DEF
+#define DEF(type, name) \
+	SETTING_DEFINE_STRUCT_##type(#name, name, struct aggregator_settings)
+
+static const struct setting_define aggregator_setting_defines[] = {
+	DEF(STR, replicator_host),
+	DEF(IN_PORT, replicator_port),
+
+	SETTING_DEFINE_LIST_END
+};
+
+const struct aggregator_settings aggregator_default_settings = {
+	.replicator_host = "replicator",
+	.replicator_port = 0
+};
+
+const struct setting_parser_info aggregator_setting_parser_info = {
+	.module_name = "aggregator",
+	.defines = aggregator_setting_defines,
+	.defaults = &aggregator_default_settings,
+
+	.type_offset = SIZE_MAX,
+	.struct_size = sizeof(struct aggregator_settings),
+
+	.parent_offset = SIZE_MAX
+};
+
+const struct aggregator_settings *aggregator_settings;
diff --git a/src/replication/aggregator/aggregator-settings.h b/src/replication/aggregator/aggregator-settings.h
new file mode 100644
index 0000000..06c8ac3
--- /dev/null
+++ b/src/replication/aggregator/aggregator-settings.h
@@ -0,0 +1,12 @@
+#ifndef AGGREGATOR_SETTINGS_H
+#define AGGREGATOR_SETTINGS_H
+
+struct aggregator_settings {
+	const char *replicator_host;
+	in_port_t replicator_port;
+};
+
+extern const struct setting_parser_info aggregator_setting_parser_info;
+extern const struct aggregator_settings *aggregator_settings;
+
+#endif
diff --git a/src/replication/aggregator/aggregator.c b/src/replication/aggregator/aggregator.c
new file mode 100644
index 0000000..1677f9f
--- /dev/null
+++ b/src/replication/aggregator/aggregator.c
@@ -0,0 +1,74 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "restrict-access.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "aggregator-settings.h"
+#include "notify-connection.h"
+#include "replicator-connection.h"
+
+struct replicator_connection *replicator;
+
+static void client_connected(struct master_service_connection *conn)
+{
+	master_service_client_connection_accept(conn);
+	notify_connection_create(conn->fd, conn->fifo);
+}
+
+static void main_preinit(void)
+{
+	struct ip_addr *ips;
+	unsigned int ips_count;
+	const struct aggregator_settings *set;
+	void **sets;
+	int ret;
+
+	sets = master_service_settings_get_others(master_service);
+	set = sets[0];
+
+	if (set->replicator_port != 0) {
+		ret = net_gethostbyname(set->replicator_host, &ips, &ips_count);
+		if (ret != 0) {
+			i_fatal("replicator_host: gethostbyname(%s) failed: %s",
+				set->replicator_host, net_gethosterror(ret));
+		}
+		replicator = replicator_connection_create_inet(ips, ips_count,
+				set->replicator_port,
+				notify_connection_sync_callback);
+	} else {
+		replicator = replicator_connection_create_unix(set->replicator_host,
+				notify_connection_sync_callback);
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	const struct setting_parser_info *set_roots[] = {
+		&aggregator_setting_parser_info,
+		NULL
+	};
+	const char *error;
+
+	master_service = master_service_init("aggregator", 0, &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(master_service);
+
+	main_preinit();
+
+	restrict_access_by_env(RESTRICT_ACCESS_FLAG_ALLOW_ROOT, NULL);
+	restrict_access_allow_coredumps(TRUE);
+	master_service_init_finish(master_service);
+
+	master_service_run(master_service, client_connected);
+
+	notify_connections_destroy_all();
+	replicator_connection_destroy(&replicator);
+	master_service_deinit(&master_service);
+        return 0;
+}
diff --git a/src/replication/aggregator/notify-connection.c b/src/replication/aggregator/notify-connection.c
new file mode 100644
index 0000000..f9587fe
--- /dev/null
+++ b/src/replication/aggregator/notify-connection.c
@@ -0,0 +1,154 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "net.h"
+#include "istream.h"
+#include "ostream.h"
+#include "llist.h"
+#include "strescape.h"
+#include "master-service.h"
+#include "replication-common.h"
+#include "replicator-connection.h"
+#include "notify-connection.h"
+
+#define MAX_INBUF_SIZE 8192
+
+#define CONNECTION_IS_FIFO(conn) \
+	((conn)->output == NULL)
+
+struct notify_connection {
+	struct notify_connection *prev, *next;
+	int refcount;
+
+	int fd;
+	struct io *io;
+	struct istream *input;
+	struct ostream *output;
+};
+
+static struct notify_connection *conns = NULL;
+
+static void notify_connection_unref(struct notify_connection *conn);
+static void notify_connection_destroy(struct notify_connection *conn);
+
+static bool notify_input_error(struct notify_connection *conn)
+{
+	if (CONNECTION_IS_FIFO(conn))
+		return TRUE;
+	notify_connection_destroy(conn);
+	return FALSE;
+}
+
+void notify_connection_sync_callback(bool success, void *context)
+{
+	struct notify_connection *conn = context;
+
+	o_stream_nsend_str(conn->output, success ? "+\n" : "-\n");
+	notify_connection_unref(conn);
+}
+
+static int
+notify_input_line(struct notify_connection *conn, const char *line)
+{
+	const char *const *args;
+	enum replication_priority priority;
+
+	/* <username> \t <priority> */
+	args = t_strsplit_tabescaped(line);
+	if (str_array_length(args) < 2) {
+		i_error("Client sent invalid input");
+		return -1;
+	}
+	if (replication_priority_parse(args[1], &priority) < 0) {
+		i_error("Client sent invalid priority: %s", args[1]);
+		return -1;
+	}
+	if (priority != REPLICATION_PRIORITY_SYNC)
+		replicator_connection_notify(replicator, args[0], priority);
+	else {
+		conn->refcount++;
+		replicator_connection_notify_sync(replicator, args[0], conn);
+	}
+	return 0;
+}
+
+static void notify_input(struct notify_connection *conn)
+{
+	const char *line;
+	int ret;
+
+	switch (i_stream_read(conn->input)) {
+	case -2:
+		/* buffer full */
+		i_error("Client sent too long line");
+		(void)notify_input_error(conn);
+		return;
+	case -1:
+		/* disconnected */
+		notify_connection_destroy(conn);
+		return;
+	}
+
+	while ((line = i_stream_next_line(conn->input)) != NULL) {
+		T_BEGIN {
+			ret = notify_input_line(conn, line);
+		} T_END;
+		if (ret < 0) {
+			if (!notify_input_error(conn))
+				return;
+		}
+	}
+}
+
+void notify_connection_create(int fd, bool fifo)
+{
+	struct notify_connection *conn;
+
+	conn = i_new(struct notify_connection, 1);
+	conn->refcount = 1;
+	conn->fd = fd;
+	conn->io = io_add(fd, IO_READ, notify_input, conn);
+	conn->input = i_stream_create_fd(fd, MAX_INBUF_SIZE);
+	if (!fifo) {
+		conn->output = o_stream_create_fd(fd, SIZE_MAX);
+		o_stream_set_no_error_handling(conn->output, TRUE);
+	}
+
+	DLLIST_PREPEND(&conns, conn);
+}
+
+static void notify_connection_unref(struct notify_connection *conn)
+{
+	i_assert(conn->refcount > 0);
+	if (--conn->refcount > 0)
+		return;
+
+	i_stream_destroy(&conn->input);
+	o_stream_destroy(&conn->output);
+	i_free(conn);
+}
+
+static void notify_connection_destroy(struct notify_connection *conn)
+{
+	i_assert(conn->fd != -1);
+
+	if (!CONNECTION_IS_FIFO(conn))
+		master_service_client_connection_destroyed(master_service);
+
+	DLLIST_REMOVE(&conns, conn);
+
+	io_remove(&conn->io);
+	i_stream_close(conn->input);
+	o_stream_close(conn->output);
+	net_disconnect(conn->fd);
+	conn->fd = -1;
+
+	notify_connection_unref(conn);
+}
+
+void notify_connections_destroy_all(void)
+{
+	while (conns != NULL)
+		notify_connection_destroy(conns);
+}
diff --git a/src/replication/aggregator/notify-connection.h b/src/replication/aggregator/notify-connection.h
new file mode 100644
index 0000000..790ae45
--- /dev/null
+++ b/src/replication/aggregator/notify-connection.h
@@ -0,0 +1,9 @@
+#ifndef NOTIFY_CONNECTION_H
+#define NOTIFY_CONNECTION_H
+
+void notify_connection_create(int fd, bool fifo);
+void notify_connections_destroy_all(void);
+
+void notify_connection_sync_callback(bool success, void *context);
+
+#endif
diff --git a/src/replication/aggregator/replicator-connection.c b/src/replication/aggregator/replicator-connection.c
new file mode 100644
index 0000000..9275376
--- /dev/null
+++ b/src/replication/aggregator/replicator-connection.c
@@ -0,0 +1,326 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "net.h"
+#include "istream.h"
+#include "ostream.h"
+#include "buffer.h"
+#include "hash.h"
+#include "llist.h"
+#include "strescape.h"
+#include "replicator-connection.h"
+
+#define MAX_INBUF_SIZE 1024
+#define REPLICATOR_RECONNECT_MSECS 5000
+#define REPLICATOR_MEMBUF_MAX_SIZE 1024*1024
+#define REPLICATOR_HANDSHAKE "VERSION\treplicator-notify\t1\t0\n"
+
+struct replicator_connection {
+	char *path;
+	struct ip_addr *ips;
+	unsigned int ips_count, ip_idx;
+	in_port_t port;
+
+	int fd;
+	struct io *io;
+	struct istream *input;
+	struct ostream *output;
+	struct timeout *to;
+
+	buffer_t *queue[REPLICATION_PRIORITY_SYNC + 1];
+
+	HASH_TABLE(void *, void *) requests;
+	unsigned int request_id_counter;
+	replicator_sync_callback_t *callback;
+};
+
+static void replicator_connection_disconnect(struct replicator_connection *conn);
+
+static int
+replicator_input_line(struct replicator_connection *conn, const char *line)
+{
+	void *context;
+	unsigned int id;
+
+	/* <+|-> \t <id> */
+	if ((line[0] != '+' && line[0] != '-') || line[1] != '\t' ||
+	    str_to_uint(line+2, &id) < 0 || id == 0) {
+		i_error("Replicator sent invalid input: %s", line);
+		return -1;
+	}
+
+	context = hash_table_lookup(conn->requests, POINTER_CAST(id));
+	if (context == NULL) {
+		i_error("Replicator sent invalid ID: %u", id);
+		return -1;
+	}
+	hash_table_remove(conn->requests, POINTER_CAST(id));
+	conn->callback(line[0] == '+', context);
+	return 0;
+}
+
+static void replicator_input(struct replicator_connection *conn)
+{
+	const char *line;
+
+	switch (i_stream_read(conn->input)) {
+	case -2:
+		/* buffer full */
+		i_error("Replicator sent too long line");
+		replicator_connection_disconnect(conn);
+		return;
+	case -1:
+		/* disconnected */
+		replicator_connection_disconnect(conn);
+		return;
+	}
+
+	while ((line = i_stream_next_line(conn->input)) != NULL)
+		(void)replicator_input_line(conn, line);
+}
+
+static bool
+replicator_send_buf(struct replicator_connection *conn, buffer_t *buf)
+{
+	const unsigned char *data = buf->data;
+	size_t len = IO_BLOCK_SIZE;
+
+	/* try to send about IO_BLOCK_SIZE amount of data,
+	   but only full lines */
+	if (len > buf->used)
+		len = buf->used;
+	for (;; len++) {
+		i_assert(len < buf->used); /* there is always LF */
+		if (data[len] == '\n') {
+			len++;
+			break;
+		}
+	}
+
+	if (o_stream_send(conn->output, data, len) < 0) {
+		replicator_connection_disconnect(conn);
+		return FALSE;
+	}
+	buffer_delete(buf, 0, len);
+	return TRUE;
+}
+
+static int replicator_output(struct replicator_connection *conn)
+{
+	enum replication_priority p;
+
+	if (o_stream_flush(conn->output) < 0) {
+		replicator_connection_disconnect(conn);
+		return 1;
+	}
+
+	for (p = REPLICATION_PRIORITY_SYNC;;) {
+		if (o_stream_get_buffer_used_size(conn->output) > 0) {
+			o_stream_set_flush_pending(conn->output, TRUE);
+			break;
+		}
+		/* output buffer is empty, send more data */
+		if (conn->queue[p]->used > 0) {
+			if (!replicator_send_buf(conn, conn->queue[p]))
+				break;
+		} else {
+			if (p == REPLICATION_PRIORITY_LOW)
+				break;
+			p--;
+		}
+	}
+	return 1;
+}
+
+static void replicator_connection_connect(struct replicator_connection *conn)
+{
+	unsigned int n;
+	int fd = -1;
+
+	if (conn->fd != -1)
+		return;
+
+	if (conn->port == 0) {
+		fd = net_connect_unix(conn->path);
+		if (fd == -1)
+			i_error("net_connect_unix(%s) failed: %m", conn->path);
+	} else {
+		for (n = 0; n < conn->ips_count; n++) {
+			unsigned int idx = conn->ip_idx;
+
+			conn->ip_idx = (conn->ip_idx + 1) % conn->ips_count;
+			fd = net_connect_ip(&conn->ips[idx], conn->port, NULL);
+			if (fd != -1)
+				break;
+			i_error("connect(%s, %u) failed: %m",
+				net_ip2addr(&conn->ips[idx]), conn->port);
+		}
+	}
+
+	if (fd == -1) {
+		if (conn->to == NULL) {
+			conn->to = timeout_add(REPLICATOR_RECONNECT_MSECS,
+					       replicator_connection_connect,
+					       conn);
+		}
+		return;
+	}
+
+	timeout_remove(&conn->to);
+	conn->fd = fd;
+	conn->io = io_add(fd, IO_READ, replicator_input, conn);
+	conn->input = i_stream_create_fd(fd, MAX_INBUF_SIZE);
+	conn->output = o_stream_create_fd(fd, SIZE_MAX);
+	o_stream_set_no_error_handling(conn->output, TRUE);
+	o_stream_nsend_str(conn->output, REPLICATOR_HANDSHAKE);
+	o_stream_set_flush_callback(conn->output, replicator_output, conn);
+}
+
+static void replicator_abort_all_requests(struct replicator_connection *conn)
+{
+	struct hash_iterate_context *iter;
+	void *key, *value;
+
+	iter = hash_table_iterate_init(conn->requests);
+	while (hash_table_iterate(iter, conn->requests, &key, &value))
+		conn->callback(FALSE, value);
+	hash_table_iterate_deinit(&iter);
+	hash_table_clear(conn->requests, TRUE);
+}
+
+static void replicator_connection_disconnect(struct replicator_connection *conn)
+{
+	if (conn->fd == -1)
+		return;
+
+	replicator_abort_all_requests(conn);
+	io_remove(&conn->io);
+	i_stream_destroy(&conn->input);
+	o_stream_destroy(&conn->output);
+	net_disconnect(conn->fd);
+	conn->fd = -1;
+}
+
+static struct replicator_connection *replicator_connection_create(void)
+{
+	struct replicator_connection *conn;
+	unsigned int i;
+
+	conn = i_new(struct replicator_connection, 1);
+	conn->fd = -1;
+	hash_table_create_direct(&conn->requests, default_pool, 0);
+	for (i = REPLICATION_PRIORITY_LOW; i <= REPLICATION_PRIORITY_SYNC; i++)
+		conn->queue[i] = buffer_create_dynamic(default_pool, 1024);
+	return conn;
+}
+
+struct replicator_connection *
+replicator_connection_create_unix(const char *path,
+				  replicator_sync_callback_t *callback)
+{
+	struct replicator_connection *conn;
+
+	conn = replicator_connection_create();
+	conn->callback = callback;
+	conn->path = i_strdup(path);
+	return conn;
+}
+
+struct replicator_connection *
+replicator_connection_create_inet(const struct ip_addr *ips,
+				  unsigned int ips_count, in_port_t port,
+				  replicator_sync_callback_t *callback)
+{
+	struct replicator_connection *conn;
+
+	conn = replicator_connection_create();
+	conn->callback = callback;
+	conn->ips = i_new(struct ip_addr, ips_count);
+	memcpy(conn->ips, ips, sizeof(*ips) * ips_count);
+	conn->ips_count = ips_count;
+	conn->port = port;
+	return conn;
+}
+
+void replicator_connection_destroy(struct replicator_connection **_conn)
+{
+	struct replicator_connection *conn = *_conn;
+	unsigned int i;
+
+	*_conn = NULL;
+	replicator_connection_disconnect(conn);
+
+	for (i = REPLICATION_PRIORITY_LOW; i <= REPLICATION_PRIORITY_SYNC; i++)
+		buffer_free(&conn->queue[i]);
+
+	timeout_remove(&conn->to);
+	hash_table_destroy(&conn->requests);
+	i_free(conn->ips);
+	i_free(conn->path);
+	i_free(conn);
+}
+
+static void
+replicator_send(struct replicator_connection *conn,
+		enum replication_priority priority, const char *data)
+{
+	size_t data_len = strlen(data);
+
+	if (conn->fd != -1 &&
+	    o_stream_get_buffer_used_size(conn->output) == 0) {
+		/* we can send data immediately */
+		o_stream_nsend(conn->output, data, data_len);
+	} else if (conn->queue[priority]->used + data_len >=
+		   	REPLICATOR_MEMBUF_MAX_SIZE) {
+		/* FIXME: compress duplicates, start writing to file */
+	} else {
+		/* queue internally to separate queues */
+		buffer_append(conn->queue[priority], data, data_len);
+		if (conn->output != NULL)
+			o_stream_set_flush_pending(conn->output, TRUE);
+	}
+}
+
+void replicator_connection_notify(struct replicator_connection *conn,
+				  const char *username,
+				  enum replication_priority priority)
+{
+	const char *priority_str = "";
+
+	replicator_connection_connect(conn);
+
+	switch (priority) {
+	case REPLICATION_PRIORITY_NONE:
+	case REPLICATION_PRIORITY_SYNC:
+		i_unreached();
+	case REPLICATION_PRIORITY_LOW:
+		priority_str = "low";
+		break;
+	case REPLICATION_PRIORITY_HIGH:
+		priority_str = "high";
+		break;
+	}
+
+	T_BEGIN {
+		replicator_send(conn, priority, t_strdup_printf(
+			"U\t%s\t%s\n", str_tabescape(username), priority_str));
+	} T_END;
+}
+
+void replicator_connection_notify_sync(struct replicator_connection *conn,
+				       const char *username, void *context)
+{
+	unsigned int id;
+
+	replicator_connection_connect(conn);
+
+	id = ++conn->request_id_counter;
+	if (id == 0) id++;
+	hash_table_insert(conn->requests, POINTER_CAST(id), context);
+
+	T_BEGIN {
+		replicator_send(conn, REPLICATION_PRIORITY_SYNC, t_strdup_printf(
+			"U\t%s\tsync\t%u\n", str_tabescape(username), id));
+	} T_END;
+}
diff --git a/src/replication/aggregator/replicator-connection.h b/src/replication/aggregator/replicator-connection.h
new file mode 100644
index 0000000..bc2c82a
--- /dev/null
+++ b/src/replication/aggregator/replicator-connection.h
@@ -0,0 +1,25 @@
+#ifndef REPLICATOR_CONNECTION_H
+#define REPLICATOR_CONNECTION_H
+
+#include "replication-common.h"
+
+typedef void replicator_sync_callback_t(bool success, void *context);
+
+struct replicator_connection *
+replicator_connection_create_unix(const char *path,
+				  replicator_sync_callback_t *callback);
+struct replicator_connection *
+replicator_connection_create_inet(const struct ip_addr *ips,
+				  unsigned int ips_count, in_port_t port,
+				  replicator_sync_callback_t *callback);
+void replicator_connection_destroy(struct replicator_connection **conn);
+
+void replicator_connection_notify(struct replicator_connection *conn,
+				  const char *username,
+				  enum replication_priority priority);
+void replicator_connection_notify_sync(struct replicator_connection *conn,
+				       const char *username, void *context);
+
+extern struct replicator_connection *replicator;
+
+#endif
diff --git a/src/replication/replication-common.h b/src/replication/replication-common.h
new file mode 100644
index 0000000..77f711c
--- /dev/null
+++ b/src/replication/replication-common.h
@@ -0,0 +1,48 @@
+#ifndef REPLICATION_COMMON_H
+#define REPLICATION_COMMON_H
+
+enum replication_priority {
+	/* user is fully replicated, as far as we know */
+	REPLICATION_PRIORITY_NONE = 0,
+	/* flag changes, expunges, etc. */
+	REPLICATION_PRIORITY_LOW,
+	/* new emails */
+	REPLICATION_PRIORITY_HIGH,
+	/* synchronously wait for new emails to be replicated */
+	REPLICATION_PRIORITY_SYNC
+};
+
+static inline const char *
+replicator_priority_to_str(enum replication_priority priority)
+{
+	switch (priority) {
+	case REPLICATION_PRIORITY_NONE:
+		return "none";
+	case REPLICATION_PRIORITY_LOW:
+		return "low";
+	case REPLICATION_PRIORITY_HIGH:
+		return "high";
+	case REPLICATION_PRIORITY_SYNC:
+		return "sync";
+	}
+	i_unreached();
+}
+
+static inline int
+replication_priority_parse(const char *str,
+			   enum replication_priority *priority_r)
+{
+	if (strcmp(str, "none") == 0)
+		*priority_r = REPLICATION_PRIORITY_NONE;
+	else if (strcmp(str, "low") == 0)
+		*priority_r = REPLICATION_PRIORITY_LOW;
+	else if (strcmp(str, "high") == 0)
+		*priority_r = REPLICATION_PRIORITY_HIGH;
+	else if (strcmp(str, "sync") == 0)
+		*priority_r = REPLICATION_PRIORITY_SYNC;
+	else
+		return -1;
+	return 0;
+}
+
+#endif
diff --git a/src/replication/replicator/Makefile.am b/src/replication/replicator/Makefile.am
new file mode 100644
index 0000000..dd2fc1d
--- /dev/null
+++ b/src/replication/replicator/Makefile.am
@@ -0,0 +1,60 @@
+pkglibexecdir = $(libexecdir)/dovecot
+
+pkglibexec_PROGRAMS = replicator
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib \
+	-I$(top_srcdir)/src/lib-test \
+	-I$(top_srcdir)/src/lib-settings \
+	-I$(top_srcdir)/src/lib-auth \
+	-I$(top_srcdir)/src/lib-master \
+	-I$(top_srcdir)/src/replication \
+	-DPKG_STATEDIR=\""$(statedir)"\" \
+	$(BINARY_CFLAGS)
+
+replicator_LDFLAGS = -export-dynamic \
+	$(BINARY_LDFLAGS)
+
+replicator_LDADD = $(LIBDOVECOT)
+replicator_DEPENDENCIES = $(LIBDOVECOT_DEPS)
+
+replicator_SOURCES = \
+	doveadm-connection.c \
+	dsync-client.c \
+	replicator.c \
+	replicator-brain.c \
+	replicator-queue.c \
+	replicator-queue-auth.c \
+	replicator-settings.c \
+	notify-connection.c
+
+noinst_HEADERS = \
+	doveadm-connection.h \
+	dsync-client.h \
+	replicator-brain.h \
+	replicator-queue.h \
+	replicator-settings.h \
+	notify-connection.h
+
+test_programs = \
+	test-replicator-queue
+
+noinst_PROGRAMS = $(test_programs)
+
+test_libs = \
+	../../lib-test/libtest.la \
+	../../lib/liblib.la
+
+test_deps = $(test_libs)
+
+test_replicator_queue_SOURCES = \
+	replicator-queue.c \
+	replicator-settings.c \
+	test-replicator-queue.c
+test_replicator_queue_LDADD = $(test_libs)
+test_replicator_queue_DEPENDENCIES = $(test_deps)
+
+check-local:
+	for bin in $(test_programs); do \
+	  if ! $(RUN_TEST) ./$$bin; then exit 1; fi; \
+	done
diff --git a/src/replication/replicator/Makefile.in b/src/replication/replicator/Makefile.in
new file mode 100644
index 0000000..8547161
--- /dev/null
+++ b/src/replication/replicator/Makefile.in
@@ -0,0 +1,897 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
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+
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+	replicator-queue-auth.$(OBJEXT) replicator-settings.$(OBJEXT) \
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+	replicator-queue-auth.c \
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+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$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)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) check-local
+check: check-am
+all-am: Makefile $(PROGRAMS) $(HEADERS)
+installdirs:
+	for dir in "$(DESTDIR)$(pkglibexecdir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(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
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstPROGRAMS \
+	clean-pkglibexecPROGRAMS mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/doveadm-connection.Po
+	-rm -f ./$(DEPDIR)/dsync-client.Po
+	-rm -f ./$(DEPDIR)/notify-connection.Po
+	-rm -f ./$(DEPDIR)/replicator-brain.Po
+	-rm -f ./$(DEPDIR)/replicator-queue-auth.Po
+	-rm -f ./$(DEPDIR)/replicator-queue.Po
+	-rm -f ./$(DEPDIR)/replicator-settings.Po
+	-rm -f ./$(DEPDIR)/replicator.Po
+	-rm -f ./$(DEPDIR)/test-replicator-queue.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
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+install-dvi-am:
+
+install-exec-am: install-pkglibexecPROGRAMS
+
+install-html: install-html-am
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+install-html-am:
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+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/doveadm-connection.Po
+	-rm -f ./$(DEPDIR)/dsync-client.Po
+	-rm -f ./$(DEPDIR)/notify-connection.Po
+	-rm -f ./$(DEPDIR)/replicator-brain.Po
+	-rm -f ./$(DEPDIR)/replicator-queue-auth.Po
+	-rm -f ./$(DEPDIR)/replicator-queue.Po
+	-rm -f ./$(DEPDIR)/replicator-settings.Po
+	-rm -f ./$(DEPDIR)/replicator.Po
+	-rm -f ./$(DEPDIR)/test-replicator-queue.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-pkglibexecPROGRAMS
+
+.MAKE: check-am install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am \
+	check-local clean clean-generic clean-libtool \
+	clean-noinstPROGRAMS clean-pkglibexecPROGRAMS cscopelist-am \
+	ctags ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-pkglibexecPROGRAMS install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	pdf pdf-am ps ps-am tags tags-am uninstall uninstall-am \
+	uninstall-pkglibexecPROGRAMS
+
+.PRECIOUS: Makefile
+
+
+check-local:
+	for bin in $(test_programs); do \
+	  if ! $(RUN_TEST) ./$$bin; then exit 1; fi; \
+	done
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/replication/replicator/doveadm-connection.c b/src/replication/replicator/doveadm-connection.c
new file mode 100644
index 0000000..1932bc6
--- /dev/null
+++ b/src/replication/replicator/doveadm-connection.c
@@ -0,0 +1,354 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "connection.h"
+#include "ostream.h"
+#include "str.h"
+#include "strescape.h"
+#include "wildcard-match.h"
+#include "master-service.h"
+#include "replicator-brain.h"
+#include "replicator-queue.h"
+#include "replicator-settings.h"
+#include "dsync-client.h"
+#include "doveadm-connection.h"
+
+#include <unistd.h>
+
+#define REPLICATOR_DOVEADM_MAJOR_VERSION 1
+#define REPLICATOR_DOVEADM_MINOR_VERSION 0
+
+struct doveadm_connection {
+	struct connection conn;
+	struct replicator_brain *brain;
+};
+static struct connection_list *doveadm_connections;
+
+static int client_input_status_overview(struct doveadm_connection *client)
+{
+	struct replicator_queue *queue =
+		replicator_brain_get_queue(client->brain);
+	struct replicator_queue_iter *iter;
+	struct replicator_user *user;
+	enum replication_priority priority;
+	unsigned int pending_counts[REPLICATION_PRIORITY_SYNC+1];
+	unsigned int user_count, next_secs, pending_failed_count;
+	unsigned int pending_full_resync_count, waiting_failed_count;
+	string_t *str = t_str_new(256);
+
+	memset(pending_counts, 0, sizeof(pending_counts));
+	pending_failed_count = 0; waiting_failed_count = 0;
+	pending_full_resync_count = 0;
+
+	user_count = 0;
+	iter = replicator_queue_iter_init(queue);
+	while ((user = replicator_queue_iter_next(iter)) != NULL) {
+		if (user->priority != REPLICATION_PRIORITY_NONE)
+			pending_counts[user->priority]++;
+		else if (replicator_queue_want_sync_now(user, &next_secs)) {
+			if (user->last_sync_failed)
+				pending_failed_count++;
+			else
+				pending_full_resync_count++;
+		} else {
+			if (user->last_sync_failed)
+				waiting_failed_count++;
+		}
+		user_count++;
+	}
+	replicator_queue_iter_deinit(&iter);
+
+	for (priority = REPLICATION_PRIORITY_SYNC; priority > 0; priority--) {
+		str_printfa(str, "Queued '%s' requests\t%u\n",
+			    replicator_priority_to_str(priority),
+			    pending_counts[priority]);
+	}
+	str_printfa(str, "Queued 'failed' requests\t%u\n",
+		    pending_failed_count);
+	str_printfa(str, "Queued 'full resync' requests\t%u\n",
+		    pending_full_resync_count);
+	str_printfa(str, "Waiting 'failed' requests\t%u\n",
+		    waiting_failed_count);
+	str_printfa(str, "Total number of known users\t%u\n", user_count);
+	str_append_c(str, '\n');
+	o_stream_nsend(client->conn.output, str_data(str), str_len(str));
+	return 0;
+}
+
+static int
+client_input_status(struct doveadm_connection *client, const char *const *args)
+{
+	struct replicator_queue *queue =
+		replicator_brain_get_queue(client->brain);
+	struct replicator_queue_iter *iter;
+	struct replicator_user *user;
+	const char *mask = args[0];
+	unsigned int next_secs;
+	string_t *str = t_str_new(128);
+
+	if (mask == NULL)
+		return client_input_status_overview(client);
+
+	iter = replicator_queue_iter_init(queue);
+	while ((user = replicator_queue_iter_next(iter)) != NULL) {
+		if (!wildcard_match(user->username, mask))
+			continue;
+
+		str_truncate(str, 0);
+		str_append_tabescaped(str, user->username);
+		str_append_c(str, '\t');
+		str_append(str, replicator_priority_to_str(user->priority));
+		if (replicator_queue_want_sync_now(user, &next_secs))
+			next_secs = 0;
+		str_printfa(str, "\t%lld\t%lld\t%d\t%lld\t%u\n",
+			    (long long)user->last_fast_sync,
+			    (long long)user->last_full_sync,
+			    user->last_sync_failed ? 1 : 0,
+			    (long long)user->last_successful_sync,
+			    next_secs);
+		o_stream_nsend(client->conn.output, str_data(str), str_len(str));
+	}
+	replicator_queue_iter_deinit(&iter);
+	o_stream_nsend(client->conn.output, "\n", 1);
+	return 0;
+}
+
+static int
+client_input_status_dsyncs(struct doveadm_connection *client)
+{
+	string_t *str = t_str_new(256);
+	const ARRAY_TYPE(dsync_client) *clients;
+	struct dsync_client *dsync_client;
+	const char *username;
+
+	clients = replicator_brain_get_dsync_clients(client->brain);
+	array_foreach_elem(clients, dsync_client) {
+		username = dsync_client_get_username(dsync_client);
+		if (username != NULL) {
+			str_append_tabescaped(str, username);
+			str_append_c(str, '\t');
+			switch (dsync_client_get_type(dsync_client)) {
+			case DSYNC_TYPE_FULL:
+				str_append(str, "full");
+				break;
+			case DSYNC_TYPE_NORMAL:
+				str_append(str, "normal");
+				break;
+			case DSYNC_TYPE_INCREMENTAL:
+				str_append(str, "incremental");
+				break;
+			}
+		} else {
+			str_append(str, "\t-");
+		}
+		str_append_c(str, '\t');
+		str_append_tabescaped(str, dsync_client_get_state(dsync_client));
+		str_append_c(str, '\n');
+	}
+
+	str_append_c(str, '\n');
+	o_stream_nsend(client->conn.output, str_data(str), str_len(str));
+	return 0;
+}
+
+static int
+client_input_replicate(struct doveadm_connection *client, const char *const *args)
+{
+	struct replicator_queue *queue =
+		replicator_brain_get_queue(client->brain);
+	struct replicator_queue_iter *iter;
+	struct replicator_user *user;
+	const char *usermask;
+	enum replication_priority priority;
+	unsigned int match_count;
+	bool full;
+
+	/* <priority> <flags> <username>|<mask> */
+	if (str_array_length(args) != 3) {
+		i_error("%s: REPLICATE: Invalid parameters", client->conn.name);
+		return -1;
+	}
+	if (replication_priority_parse(args[0], &priority) < 0) {
+		o_stream_nsend_str(client->conn.output, "-Invalid priority\n");
+		return 0;
+	}
+	full = strchr(args[1], 'f') != NULL;
+	usermask = args[2];
+	if (strchr(usermask, '*') == NULL && strchr(usermask, '?') == NULL) {
+		struct replicator_user *user =
+			replicator_queue_get(queue, usermask);
+		if (full)
+			user->force_full_sync = TRUE;
+		replicator_queue_update(queue, user, priority);
+		replicator_queue_add(queue, user);
+		o_stream_nsend_str(client->conn.output, "+1\n");
+		return 0;
+	}
+
+	match_count = 0;
+	iter = replicator_queue_iter_init(queue);
+	while ((user = replicator_queue_iter_next(iter)) != NULL) {
+		if (!wildcard_match(user->username, usermask))
+			continue;
+		if (full)
+			user->force_full_sync = TRUE;
+		replicator_queue_update(queue, user, priority);
+		replicator_queue_add(queue, user);
+		match_count++;
+	}
+	replicator_queue_iter_deinit(&iter);
+	o_stream_nsend_str(client->conn.output,
+			  t_strdup_printf("+%u\n", match_count));
+	return 0;
+}
+
+static int
+client_input_add(struct doveadm_connection *client, const char *const *args)
+{
+	struct replicator_queue *queue =
+		replicator_brain_get_queue(client->brain);
+	const struct replicator_settings *set =
+		replicator_brain_get_settings(client->brain);
+
+	/* <usermask> */
+	if (str_array_length(args) != 1) {
+		i_error("%s: ADD: Invalid parameters", client->conn.name);
+		return -1;
+	}
+
+	if (strchr(args[0], '*') == NULL && strchr(args[0], '?') == NULL) {
+		struct replicator_user *user =
+			replicator_queue_get(queue, args[0]);
+		replicator_queue_add(queue, user);
+	} else {
+		replicator_queue_add_auth_users(queue, set->auth_socket_path,
+						args[0], ioloop_time);
+	}
+	o_stream_nsend_str(client->conn.output, "+\n");
+	return 0;
+}
+
+static int
+client_input_remove(struct doveadm_connection *client, const char *const *args)
+{
+	struct replicator_queue *queue =
+		replicator_brain_get_queue(client->brain);
+	struct replicator_user *user;
+
+	/* <username> */
+	if (str_array_length(args) != 1) {
+		i_error("%s: REMOVE: Invalid parameters", client->conn.name);
+		return -1;
+	}
+	user = replicator_queue_lookup(queue, args[0]);
+	if (user == NULL)
+		o_stream_nsend_str(client->conn.output, "-User not found\n");
+	else {
+		replicator_queue_remove(queue, &user);
+		o_stream_nsend_str(client->conn.output, "+\n");
+	}
+	return 0;
+}
+
+static int
+client_input_notify(struct doveadm_connection *client, const char *const *args)
+{
+	struct replicator_queue *queue =
+		replicator_brain_get_queue(client->brain);
+	struct replicator_user *user;
+
+	/* <username> <flags> <state> */
+	if (str_array_length(args) < 3) {
+		i_error("%s: NOTIFY: Invalid parameters", client->conn.name);
+		return -1;
+	}
+
+	user = replicator_queue_get(queue, args[0]);
+	if (args[1][0] == 'f')
+		user->last_full_sync = ioloop_time;
+	user->last_fast_sync = ioloop_time;
+	user->last_update = ioloop_time;
+	replicator_queue_add(queue, user);
+
+	if (args[2][0] != '\0') {
+		i_free(user->state);
+		user->state = i_strdup(args[2]);
+	}
+	o_stream_nsend_str(client->conn.output, "+\n");
+	return 0;
+}
+
+static int client_input_args(struct connection *conn, const char *const *args)
+{
+	struct doveadm_connection *client = (struct doveadm_connection *)conn;
+	const char *cmd = args[0];
+
+	if (cmd == NULL) {
+		i_error("%s: Empty command", conn->name);
+		return 0;
+	}
+	args++;
+
+	if (strcmp(cmd, "STATUS") == 0)
+		return client_input_status(client, args);
+	else if (strcmp(cmd, "STATUS-DSYNC") == 0)
+		return client_input_status_dsyncs(client);
+	else if (strcmp(cmd, "REPLICATE") == 0)
+		return client_input_replicate(client, args);
+	else if (strcmp(cmd, "ADD") == 0)
+		return client_input_add(client, args);
+	else if (strcmp(cmd, "REMOVE") == 0)
+		return client_input_remove(client, args);
+	else if (strcmp(cmd, "NOTIFY") == 0)
+		return client_input_notify(client, args);
+	i_error("%s: Unknown command: %s", conn->name, cmd);
+	return -1;
+}
+
+static void client_destroy(struct connection *conn)
+{
+	struct doveadm_connection *client = (struct doveadm_connection *)conn;
+
+	connection_deinit(&client->conn);
+	i_free(client);
+
+	master_service_client_connection_destroyed(master_service);
+}
+
+void doveadm_connection_create(struct replicator_brain *brain, int fd)
+{
+	struct doveadm_connection *client;
+
+	client = i_new(struct doveadm_connection, 1);
+	client->brain = brain;
+	connection_init_server(doveadm_connections, &client->conn,
+			       "doveadm-client", fd, fd);
+}
+
+static struct connection_settings doveadm_conn_set = {
+	.service_name_in = "replicator-doveadm-client",
+	.service_name_out = "replicator-doveadm-server",
+	.major_version = REPLICATOR_DOVEADM_MAJOR_VERSION,
+	.minor_version = REPLICATOR_DOVEADM_MINOR_VERSION,
+
+	.input_max_size = SIZE_MAX,
+	.output_max_size = SIZE_MAX,
+	.client = FALSE
+};
+
+static const struct connection_vfuncs doveadm_conn_vfuncs = {
+	.destroy = client_destroy,
+	.input_args = client_input_args
+};
+
+void doveadm_connections_init(void)
+{
+	doveadm_connections = connection_list_init(&doveadm_conn_set,
+						   &doveadm_conn_vfuncs);
+}
+
+void doveadm_connections_deinit(void)
+{
+	connection_list_deinit(&doveadm_connections);
+}
diff --git a/src/replication/replicator/doveadm-connection.h b/src/replication/replicator/doveadm-connection.h
new file mode 100644
index 0000000..066fc7b
--- /dev/null
+++ b/src/replication/replicator/doveadm-connection.h
@@ -0,0 +1,11 @@
+#ifndef DOVEADM_CONNECTION_H
+#define DOVEADM_CONNECTION_H
+
+struct replicator_brain;
+
+void doveadm_connection_create(struct replicator_brain *brain, int fd);
+
+void doveadm_connections_init(void);
+void doveadm_connections_deinit(void);
+
+#endif
diff --git a/src/replication/replicator/dsync-client.c b/src/replication/replicator/dsync-client.c
new file mode 100644
index 0000000..2df12da
--- /dev/null
+++ b/src/replication/replicator/dsync-client.c
@@ -0,0 +1,274 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "net.h"
+#include "istream.h"
+#include "ostream.h"
+#include "str.h"
+#include "strescape.h"
+#include "dsync-client.h"
+
+#include <unistd.h>
+
+#define DSYNC_FAIL_TIMEOUT_MSECS (1000*5)
+#define DOVEADM_HANDSHAKE "VERSION\tdoveadm-server\t1\t0\n"
+
+struct dsync_client {
+	char *path;
+	int fd;
+	struct io *io;
+	struct istream *input;
+	struct ostream *output;
+	struct timeout *to;
+
+	char *dsync_params;
+	char *username;
+	char *state;
+	enum dsync_type sync_type;
+	dsync_callback_t *callback;
+	void *context;
+
+	time_t last_connect_failure;
+	bool handshaked:1;
+	bool cmd_sent:1;
+};
+
+struct dsync_client *
+dsync_client_init(const char *path, const char *dsync_params)
+{
+	struct dsync_client *client;
+
+	client = i_new(struct dsync_client, 1);
+	client->path = i_strdup(path);
+	client->fd = -1;
+	client->dsync_params = i_strdup(dsync_params);
+	return client;
+}
+
+static void dsync_callback(struct dsync_client *client,
+			   const char *state, enum dsync_reply reply)
+{
+	dsync_callback_t *callback = client->callback;
+	void *context = client->context;
+
+	timeout_remove(&client->to);
+
+	client->callback = NULL;
+	client->context = NULL;
+
+	/* make sure callback doesn't try to reuse this connection, since
+	   we can't currently handle it */
+	i_assert(!client->cmd_sent);
+	client->cmd_sent = TRUE;
+	callback(reply, state, context);
+	client->cmd_sent = FALSE;
+}
+
+static void dsync_close(struct dsync_client *client)
+{
+	client->cmd_sent = FALSE;
+	client->handshaked = FALSE;
+	i_free_and_null(client->state);
+	i_free_and_null(client->username);
+
+	if (client->fd == -1)
+		return;
+
+	io_remove(&client->io);
+	o_stream_destroy(&client->output);
+	i_stream_destroy(&client->input);
+	if (close(client->fd) < 0)
+		i_error("close(dsync) failed: %m");
+	client->fd = -1;
+}
+
+static void dsync_disconnect(struct dsync_client *client)
+{
+	dsync_close(client);
+	if (client->callback != NULL)
+		dsync_callback(client, "", DSYNC_REPLY_FAIL);
+}
+
+void dsync_client_deinit(struct dsync_client **_client)
+{
+	struct dsync_client *client = *_client;
+
+	*_client = NULL;
+
+	dsync_disconnect(client);
+	i_free(client->dsync_params);
+	i_free(client->path);
+	i_free(client);
+}
+
+static int dsync_input_line(struct dsync_client *client, const char *line)
+{
+	const char *state;
+
+	if (!client->handshaked) {
+		if (strcmp(line, "+") != 0) {
+			i_error("%s: Unexpected handshake: %s",
+				client->path, line);
+			return -1;
+		}
+		client->handshaked = TRUE;
+		return 0;
+	}
+	if (client->callback == NULL) {
+		i_error("%s: Unexpected input: %s", client->path, line);
+		return -1;
+	}
+	if (client->state == NULL) {
+		client->state = i_strdup(t_strcut(line, '\t'));
+		return 0;
+	}
+	state = t_strdup(client->state);
+	line = t_strdup(line);
+	dsync_close(client);
+
+	if (line[0] == '+')
+		dsync_callback(client, state, DSYNC_REPLY_OK);
+	else if (line[0] == '-') {
+		if (strcmp(line+1, "NOUSER") == 0)
+			dsync_callback(client, "", DSYNC_REPLY_NOUSER);
+		else if (strcmp(line+1, "NOREPLICATE") == 0)
+			dsync_callback(client, "", DSYNC_REPLY_NOREPLICATE);
+		else
+			dsync_callback(client, "", DSYNC_REPLY_FAIL);
+	} else {
+		i_error("%s: Invalid input: %s", client->path, line);
+		return -1;
+	}
+	/* FIXME: disconnect after each request for now.
+	   doveadm server's getopt() handling seems to break otherwise.
+	   also with multiple UIDs doveadm-server fails because setid() fails */
+	return -1;
+}
+
+static void dsync_input(struct dsync_client *client)
+{
+	const char *line;
+
+	while ((line = i_stream_read_next_line(client->input)) != NULL) {
+		if (dsync_input_line(client, line) < 0) {
+			dsync_disconnect(client);
+			return;
+		}
+	}
+	if (client->input->eof)
+		dsync_disconnect(client);
+}
+
+static int dsync_connect(struct dsync_client *client)
+{
+	if (client->fd != -1)
+		return 0;
+
+	if (client->last_connect_failure == ioloop_time)
+		return -1;
+
+	client->fd = net_connect_unix(client->path);
+	if (client->fd == -1) {
+		i_error("net_connect_unix(%s) failed: %m", client->path);
+		client->last_connect_failure = ioloop_time;
+		return -1;
+	}
+	client->last_connect_failure = 0;
+	client->io = io_add(client->fd, IO_READ, dsync_input, client);
+	client->input = i_stream_create_fd(client->fd, SIZE_MAX);
+	client->output = o_stream_create_fd(client->fd, SIZE_MAX);
+	o_stream_set_no_error_handling(client->output, TRUE);
+	o_stream_nsend_str(client->output, DOVEADM_HANDSHAKE);
+	return 0;
+}
+
+static void dsync_fail_timeout(struct dsync_client *client)
+{
+	dsync_disconnect(client);
+}
+
+void dsync_client_sync(struct dsync_client *client,
+		       const char *username, const char *state, bool full,
+		       dsync_callback_t *callback, void *context)
+{
+	string_t *cmd;
+	unsigned int pos;
+	char *p;
+
+	i_assert(callback != NULL);
+	i_assert(!dsync_client_is_busy(client));
+
+	client->username = i_strdup(username);
+	client->cmd_sent = TRUE;
+	client->callback = callback;
+	client->context = context;
+	if (full)
+		client->sync_type = DSYNC_TYPE_FULL;
+	else if (state != NULL && state[0] != '\0')
+		client->sync_type = DSYNC_TYPE_INCREMENTAL;
+	else
+		client->sync_type = DSYNC_TYPE_NORMAL;
+
+	if (dsync_connect(client) < 0) {
+		i_assert(client->to == NULL);
+		client->to = timeout_add(DSYNC_FAIL_TIMEOUT_MSECS,
+				       dsync_fail_timeout, client);
+	} else {
+		/* <flags> <username> <command> [<args>] */
+		cmd = t_str_new(256);
+		str_append_c(cmd, '\t');
+		str_append_tabescaped(cmd, username);
+		str_append(cmd, "\tsync\t");
+		pos = str_len(cmd);
+		/* insert the parameters. we can do it simply by converting
+		   spaces into tabs, it's unlikely we'll ever need anything
+		   more complex here. */
+		str_append(cmd, client->dsync_params);
+		p = str_c_modifiable(cmd) + pos;
+		for (; *p != '\0'; p++) {
+			if (*p == ' ')
+				*p = '\t';
+		}
+		if (full)
+			str_append(cmd, "\t-f");
+		str_append(cmd, "\t-s\t");
+		if (state != NULL)
+			str_append(cmd, state);
+		str_append_c(cmd, '\n');
+		o_stream_nsend(client->output, str_data(cmd), str_len(cmd));
+	}
+}
+
+bool dsync_client_is_busy(struct dsync_client *client)
+{
+	return client->cmd_sent;
+}
+
+const char *dsync_client_get_username(struct dsync_client *conn)
+{
+	return conn->username;
+}
+
+enum dsync_type dsync_client_get_type(struct dsync_client *conn)
+{
+	return conn->sync_type;
+}
+
+const char *dsync_client_get_state(struct dsync_client *conn)
+{
+	if (conn->fd == -1) {
+		if (conn->last_connect_failure == 0)
+			return "Not connected";
+		return t_strdup_printf("Failed to connect to '%s' - last attempt %ld secs ago", conn->path,
+				       (long)(ioloop_time - conn->last_connect_failure));
+	}
+	if (!dsync_client_is_busy(conn))
+		return "Idle";
+	if (!conn->handshaked)
+		return "Waiting for handshake";
+	if (conn->state == NULL)
+		return "Waiting for dsync to finish";
+	else
+		return "Waiting for dsync to finish (second line)";
+}
diff --git a/src/replication/replicator/dsync-client.h b/src/replication/replicator/dsync-client.h
new file mode 100644
index 0000000..c55b815
--- /dev/null
+++ b/src/replication/replicator/dsync-client.h
@@ -0,0 +1,37 @@
+#ifndef DSYNC_CLIENT_H
+#define DSYNC_CLIENT_H
+
+struct dsync_client;
+
+enum dsync_reply {
+	DSYNC_REPLY_OK,
+	DSYNC_REPLY_FAIL,
+	DSYNC_REPLY_NOUSER,
+	DSYNC_REPLY_NOREPLICATE,
+};
+
+enum dsync_type {
+	DSYNC_TYPE_FULL,
+	DSYNC_TYPE_NORMAL,
+	DSYNC_TYPE_INCREMENTAL
+};
+
+ARRAY_DEFINE_TYPE(dsync_client, struct dsync_client *);
+
+typedef void dsync_callback_t(enum dsync_reply reply,
+			      const char *state, void *context);
+
+struct dsync_client *
+dsync_client_init(const char *path, const char *dsync_params);
+void dsync_client_deinit(struct dsync_client **conn);
+
+void dsync_client_sync(struct dsync_client *conn,
+		       const char *username, const char *state, bool full,
+		       dsync_callback_t *callback, void *context);
+bool dsync_client_is_busy(struct dsync_client *conn);
+
+const char *dsync_client_get_username(struct dsync_client *conn);
+enum dsync_type dsync_client_get_type(struct dsync_client *conn);
+const char *dsync_client_get_state(struct dsync_client *conn);
+
+#endif
diff --git a/src/replication/replicator/notify-connection.c b/src/replication/replicator/notify-connection.c
new file mode 100644
index 0000000..0f2c386
--- /dev/null
+++ b/src/replication/replicator/notify-connection.c
@@ -0,0 +1,206 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "llist.h"
+#include "istream.h"
+#include "ostream.h"
+#include "strescape.h"
+#include "master-service.h"
+#include "replicator-queue.h"
+#include "notify-connection.h"
+
+#include <unistd.h>
+
+#define MAX_INBUF_SIZE (1024*64)
+#define NOTIFY_CLIENT_PROTOCOL_MAJOR_VERSION 1
+#define NOTIFY_CLIENT_PROTOCOL_MINOR_VERSION 0
+
+struct notify_connection {
+	struct notify_connection *prev, *next;
+	int refcount;
+
+	int fd;
+	struct io *io;
+	struct istream *input;
+	struct ostream *output;
+
+	struct replicator_queue *queue;
+
+	bool version_received:1;
+	bool destroyed:1;
+};
+
+struct notify_sync_request {
+	struct notify_connection *conn;
+	unsigned int id;
+};
+
+static struct notify_connection *connections;
+
+static void notify_connection_destroy(struct notify_connection *conn);
+
+static void notify_sync_callback(bool success, void *context)
+{
+	struct notify_sync_request *request = context;
+
+	o_stream_nsend_str(request->conn->output, t_strdup_printf(
+		"%c\t%u\n", success ? '+' : '-', request->id));
+
+	notify_connection_unref(&request->conn);
+	i_free(request);
+}
+
+static int
+notify_connection_input_line(struct notify_connection *conn, const char *line)
+{
+	struct notify_sync_request *request;
+	const char *const *args;
+	enum replication_priority priority;
+	unsigned int id;
+
+	/* U \t <username> \t <priority> [\t <sync id>] */
+	args = t_strsplit_tabescaped(line);
+	if (str_array_length(args) < 2) {
+		i_error("notify client sent invalid input: %s", line);
+		return -1;
+	}
+	if (strcmp(args[0], "U") != 0) {
+		i_error("notify client sent unknown command: %s", args[0]);
+		return -1;
+	}
+	if (replication_priority_parse(args[2], &priority) < 0) {
+		i_error("notify client sent invalid priority: %s", args[2]);
+		return -1;
+	}
+	if (priority != REPLICATION_PRIORITY_SYNC) {
+		struct replicator_user *user =
+			replicator_queue_get(conn->queue, args[1]);
+		replicator_queue_update(conn->queue, user, priority);
+		replicator_queue_add(conn->queue, user);
+	} else if (args[3] == NULL || str_to_uint(args[3], &id) < 0) {
+		i_error("notify client sent invalid sync id: %s", line);
+		return -1;
+	} else {
+		request = i_new(struct notify_sync_request, 1);
+		request->conn = conn;
+		request->id = id;
+		notify_connection_ref(conn);
+		struct replicator_user *user =
+			replicator_queue_get(conn->queue, args[1]);
+		replicator_queue_update(conn->queue, user,
+					REPLICATION_PRIORITY_SYNC);
+		replicator_queue_add_sync_callback(conn->queue, user,
+						   notify_sync_callback,
+						   request);
+	}
+	return 0;
+}
+
+static void notify_connection_input(struct notify_connection *conn)
+{
+	const char *line;
+	int ret;
+
+	switch (i_stream_read(conn->input)) {
+	case -2:
+		i_error("BUG: Client connection sent too much data");
+		notify_connection_destroy(conn);
+		return;
+	case -1:
+		notify_connection_destroy(conn);
+		return;
+	}
+
+	if (!conn->version_received) {
+		if ((line = i_stream_next_line(conn->input)) == NULL)
+			return;
+
+		if (!version_string_verify(line, "replicator-notify",
+				NOTIFY_CLIENT_PROTOCOL_MAJOR_VERSION)) {
+			i_error("Notify client not compatible with this server "
+				"(mixed old and new binaries?)");
+			notify_connection_destroy(conn);
+			return;
+		}
+		conn->version_received = TRUE;
+	}
+
+	while ((line = i_stream_next_line(conn->input)) != NULL) {
+		T_BEGIN {
+			ret = notify_connection_input_line(conn, line);
+		} T_END;
+		if (ret < 0) {
+			notify_connection_destroy(conn);
+			break;
+		}
+	}
+}
+
+struct notify_connection *
+notify_connection_create(int fd, struct replicator_queue *queue)
+{
+	struct notify_connection *conn;
+
+	i_assert(fd >= 0);
+
+	conn = i_new(struct notify_connection, 1);
+	conn->refcount = 1;
+	conn->queue = queue;
+	conn->fd = fd;
+	conn->input = i_stream_create_fd(fd, MAX_INBUF_SIZE);
+	conn->output = o_stream_create_fd(fd, SIZE_MAX);
+	o_stream_set_no_error_handling(conn->output, TRUE);
+	conn->io = io_add(fd, IO_READ, notify_connection_input, conn);
+	conn->queue = queue;
+
+	DLLIST_PREPEND(&connections, conn);
+	return conn;
+}
+
+static void notify_connection_destroy(struct notify_connection *conn)
+{
+	if (conn->destroyed)
+		return;
+	conn->destroyed = TRUE;
+
+	DLLIST_REMOVE(&connections, conn);
+
+	io_remove(&conn->io);
+	i_stream_close(conn->input);
+	o_stream_close(conn->output);
+	if (close(conn->fd) < 0)
+		i_error("close(notify connection) failed: %m");
+	conn->fd = -1;
+
+	notify_connection_unref(&conn);
+	master_service_client_connection_destroyed(master_service);
+}
+
+void notify_connection_ref(struct notify_connection *conn)
+{
+	i_assert(conn->refcount > 0);
+
+	conn->refcount++;
+}
+
+void notify_connection_unref(struct notify_connection **_conn)
+{
+	struct notify_connection *conn = *_conn;
+
+	i_assert(conn->refcount > 0);
+
+	*_conn = NULL;
+	if (--conn->refcount > 0)
+		return;
+
+	notify_connection_destroy(conn);
+	i_stream_unref(&conn->input);
+	o_stream_unref(&conn->output);
+	i_free(conn);
+}
+
+void notify_connections_destroy_all(void)
+{
+	while (connections != NULL)
+		notify_connection_destroy(connections);
+}
diff --git a/src/replication/replicator/notify-connection.h b/src/replication/replicator/notify-connection.h
new file mode 100644
index 0000000..fa62fc7
--- /dev/null
+++ b/src/replication/replicator/notify-connection.h
@@ -0,0 +1,13 @@
+#ifndef NOTIFY_CONNECTION_H
+#define NOTIFY_CONNECTION_H
+
+struct replicator_queue;
+
+struct notify_connection *
+notify_connection_create(int fd, struct replicator_queue *queue);
+void notify_connection_ref(struct notify_connection *conn);
+void notify_connection_unref(struct notify_connection **conn);
+
+void notify_connections_destroy_all(void);
+
+#endif
diff --git a/src/replication/replicator/replicator-brain.c b/src/replication/replicator/replicator-brain.c
new file mode 100644
index 0000000..65cfcec
--- /dev/null
+++ b/src/replication/replicator/replicator-brain.c
@@ -0,0 +1,202 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "ioloop.h"
+#include "dsync-client.h"
+#include "replicator-settings.h"
+#include "replicator-queue.h"
+#include "replicator-brain.h"
+
+struct replicator_sync_context {
+	struct replicator_brain *brain;
+	struct replicator_user *user;
+};
+
+struct replicator_brain {
+	pool_t pool;
+	struct replicator_queue *queue;
+	const struct replicator_settings *set;
+	struct timeout *to;
+
+	ARRAY_TYPE(dsync_client) dsync_clients;
+
+	bool deinitializing:1;
+};
+
+static void replicator_brain_fill(struct replicator_brain *brain);
+
+static void replicator_brain_timeout(struct replicator_brain *brain)
+{
+	timeout_remove(&brain->to);
+	replicator_brain_fill(brain);
+}
+
+static void replicator_brain_queue_changed(void *context)
+{
+	struct replicator_brain *brain = context;
+
+	/* Delay a bit filling the replication. We could have gotten here
+	   before the replicator_user change was fully filled out. */
+	timeout_remove(&brain->to);
+	brain->to = timeout_add_short(0, replicator_brain_timeout, brain);
+}
+
+struct replicator_brain *
+replicator_brain_init(struct replicator_queue *queue,
+		      const struct replicator_settings *set)
+{
+	struct replicator_brain *brain;
+	pool_t pool;
+
+	pool = pool_alloconly_create("replication brain", 1024);
+	brain = p_new(pool, struct replicator_brain, 1);
+	brain->pool = pool;
+	brain->queue = queue;
+	brain->set = set;
+	p_array_init(&brain->dsync_clients, pool, 16);
+	replicator_queue_set_change_callback(queue,
+		replicator_brain_queue_changed, brain);
+	replicator_brain_fill(brain);
+	return brain;
+}
+
+void replicator_brain_deinit(struct replicator_brain **_brain)
+{
+	struct replicator_brain *brain = *_brain;
+	struct dsync_client *conn;
+
+	*_brain = NULL;
+
+	brain->deinitializing = TRUE;
+	array_foreach_elem(&brain->dsync_clients, conn)
+		dsync_client_deinit(&conn);
+	timeout_remove(&brain->to);
+	pool_unref(&brain->pool);
+}
+
+struct replicator_queue *
+replicator_brain_get_queue(struct replicator_brain *brain)
+{
+	return brain->queue;
+}
+
+const struct replicator_settings *
+replicator_brain_get_settings(struct replicator_brain *brain)
+{
+	return brain->set;
+}
+
+const ARRAY_TYPE(dsync_client) *
+replicator_brain_get_dsync_clients(struct replicator_brain *brain)
+{
+	return &brain->dsync_clients;
+}
+
+static struct dsync_client *
+get_dsync_client(struct replicator_brain *brain)
+{
+	struct dsync_client *conn;
+
+	array_foreach_elem(&brain->dsync_clients, conn) {
+		if (!dsync_client_is_busy(conn))
+			return conn;
+	}
+	if (array_count(&brain->dsync_clients) ==
+	    brain->set->replication_max_conns)
+		return NULL;
+
+	conn = dsync_client_init(brain->set->doveadm_socket_path,
+				 brain->set->replication_dsync_parameters);
+	array_push_back(&brain->dsync_clients, &conn);
+	return conn;
+}
+
+static void dsync_callback(enum dsync_reply reply, const char *state,
+			   void *context)
+{
+	struct replicator_sync_context *ctx = context;
+	struct replicator_user *user = ctx->user;
+
+	if (!replicator_user_unref(&user)) {
+		/* user was already removed */
+	} else if (reply == DSYNC_REPLY_NOUSER ||
+		   reply == DSYNC_REPLY_NOREPLICATE) {
+		/* user no longer exists, or is not wanted for replication,
+		   remove from replication */
+		replicator_queue_remove(ctx->brain->queue, &ctx->user);
+	} else {
+		i_free(ctx->user->state);
+		ctx->user->state = i_strdup_empty(state);
+		ctx->user->last_sync_failed = reply != DSYNC_REPLY_OK;
+		if (reply == DSYNC_REPLY_OK)
+			ctx->user->last_successful_sync = ioloop_time;
+		replicator_queue_push(ctx->brain->queue, ctx->user);
+	}
+	if (!ctx->brain->deinitializing)
+		replicator_brain_fill(ctx->brain);
+	i_free(ctx);
+}
+
+static bool
+dsync_replicate(struct replicator_brain *brain, struct replicator_user *user)
+{
+	struct replicator_sync_context *ctx;
+	struct dsync_client *conn;
+	time_t next_full_sync;
+	bool full;
+
+	conn = get_dsync_client(brain);
+	if (conn == NULL)
+		return FALSE;
+
+	next_full_sync = user->last_full_sync +
+		brain->set->replication_full_sync_interval;
+	full = next_full_sync <= ioloop_time;
+	/* update the sync times immediately. if the replication fails we still
+	   wouldn't want it to be retried immediately. */
+	user->last_fast_sync = ioloop_time;
+	if (full || user->force_full_sync) {
+		user->last_full_sync = ioloop_time;
+		user->force_full_sync = FALSE;
+	}
+	/* reset priority also. if more updates arrive during replication
+	   we'll do another replication to make sure nothing gets lost */
+	user->priority = REPLICATION_PRIORITY_NONE;
+
+	ctx = i_new(struct replicator_sync_context, 1);
+	ctx->brain = brain;
+	ctx->user = user;
+	replicator_user_ref(user);
+	dsync_client_sync(conn, user->username, user->state, full,
+			  dsync_callback, ctx);
+	return TRUE;
+}
+
+static bool replicator_brain_fill_next(struct replicator_brain *brain)
+{
+	struct replicator_user *user;
+	unsigned int next_secs;
+
+	user = replicator_queue_pop(brain->queue, &next_secs);
+	if (user == NULL) {
+		/* nothing more to do */
+		timeout_remove(&brain->to);
+		brain->to = timeout_add(next_secs * 1000,
+					replicator_brain_timeout, brain);
+		return FALSE;
+	}
+
+	if (!dsync_replicate(brain, user)) {
+		/* all connections were full, put the user back to queue */
+		replicator_queue_push(brain->queue, user);
+		return FALSE;
+	}
+	/* replication started for the user */
+	return TRUE;
+}
+
+static void replicator_brain_fill(struct replicator_brain *brain)
+{
+	while (replicator_brain_fill_next(brain)) ;
+}
diff --git a/src/replication/replicator/replicator-brain.h b/src/replication/replicator/replicator-brain.h
new file mode 100644
index 0000000..6e9ae23
--- /dev/null
+++ b/src/replication/replicator/replicator-brain.h
@@ -0,0 +1,20 @@
+#ifndef REPLICATOR_BRAIN_H
+#define REPLICATOR_BRAIN_H
+
+struct replicator_settings;
+struct replicator_queue;
+
+struct replicator_brain *
+replicator_brain_init(struct replicator_queue *queue,
+		      const struct replicator_settings *set);
+void replicator_brain_deinit(struct replicator_brain **brain);
+
+struct replicator_queue *
+replicator_brain_get_queue(struct replicator_brain *brain);
+const struct replicator_settings *
+replicator_brain_get_settings(struct replicator_brain *brain);
+
+const ARRAY_TYPE(dsync_client) *
+replicator_brain_get_dsync_clients(struct replicator_brain *brain);
+
+#endif
diff --git a/src/replication/replicator/replicator-queue-auth.c b/src/replication/replicator/replicator-queue-auth.c
new file mode 100644
index 0000000..eedb814
--- /dev/null
+++ b/src/replication/replicator/replicator-queue-auth.c
@@ -0,0 +1,37 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "auth-master.h"
+#include "replicator-queue.h"
+
+#define REPLICATOR_AUTH_SERVICE_NAME "replicator"
+
+void replicator_queue_add_auth_users(struct replicator_queue *queue,
+				     const char *auth_socket_path,
+				     const char *usermask, time_t last_update)
+{
+	struct auth_master_connection *auth_conn;
+	struct auth_master_user_list_ctx *ctx;
+	struct auth_user_info user_info;
+	struct replicator_user *user;
+	const char *username;
+
+	auth_conn = auth_master_init(auth_socket_path,
+				     AUTH_MASTER_FLAG_NO_IDLE_TIMEOUT);
+
+	i_zero(&user_info);
+	user_info.service = REPLICATOR_AUTH_SERVICE_NAME;
+
+	/* add all users into replication queue, so that we can start doing
+	   full syncs for everyone whose state can't be found */
+	ctx = auth_master_user_list_init(auth_conn, usermask, &user_info);
+	while ((username = auth_master_user_list_next(ctx)) != NULL) {
+		user = replicator_queue_get(queue, username);
+		replicator_queue_update(queue, user, REPLICATION_PRIORITY_NONE);
+		replicator_queue_add(queue, user);
+		user->last_update = last_update;
+	}
+	if (auth_master_user_list_deinit(&ctx) < 0)
+		i_error("listing users failed, can't replicate existing data");
+	auth_master_deinit(&auth_conn);
+}
diff --git a/src/replication/replicator/replicator-queue.c b/src/replication/replicator/replicator-queue.c
new file mode 100644
index 0000000..31f296a
--- /dev/null
+++ b/src/replication/replicator/replicator-queue.c
@@ -0,0 +1,527 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "ioloop.h"
+#include "istream.h"
+#include "ostream.h"
+#include "str.h"
+#include "strescape.h"
+#include "hash.h"
+#include "replicator-queue.h"
+
+#include <unistd.h>
+#include <fcntl.h>
+
+struct replicator_sync_lookup {
+	struct replicator_user *user;
+
+	replicator_sync_callback_t *callback;
+	void *context;
+
+	bool wait_for_next_push;
+};
+
+struct replicator_queue {
+	struct priorityq *user_queue;
+	/* username => struct replicator_user* */
+	HASH_TABLE(char *, struct replicator_user *) user_hash;
+
+	ARRAY(struct replicator_sync_lookup) sync_lookups;
+
+	unsigned int full_sync_interval;
+	unsigned int failure_resync_interval;
+
+	void (*change_callback)(void *context);
+	void *change_context;
+};
+
+struct replicator_queue_iter {
+	struct replicator_queue *queue;
+	struct hash_iterate_context *iter;
+};
+
+static unsigned int replicator_full_sync_interval = 0;
+static unsigned int replicator_failure_resync_interval = 0;
+
+static time_t replicator_user_next_sync_time(const struct replicator_user *user)
+{
+	/* The idea is that the higher the priority, the more likely it will
+	   be prioritized over low priority syncs. However, to avoid permanent
+	   starvation of lower priority users, the priority boost is only
+	   temporary.
+
+	   The REPLICATION_PRIORITY_*_SECS macros effectively specify how long
+	   lower priority requests are allowed to be waiting. */
+#define REPLICATION_PRIORITY_LOW_SECS (60*15)
+#define REPLICATION_PRIORITY_HIGH_SECS (60*30)
+#define REPLICATION_PRIORITY_SYNC_SECS (60*45)
+	/* When priority != none, user needs to be replicated ASAP.
+	   The question is just whether the queue is already busy and other
+	   users need to be synced even more faster. */
+	if (user->last_fast_sync == 0) {
+		/* User has never been synced yet. These will be replicated
+		   first. Still, try to replicate higher priority users faster
+		   than lower priority users. */
+		if (user->priority != REPLICATION_PRIORITY_NONE)
+			return REPLICATION_PRIORITY_SYNC - user->priority;
+	}
+	switch (user->priority) {
+	case REPLICATION_PRIORITY_NONE:
+		break;
+	case REPLICATION_PRIORITY_LOW:
+		i_assert(user->last_update >= REPLICATION_PRIORITY_LOW_SECS);
+		return user->last_update - REPLICATION_PRIORITY_LOW_SECS;
+	case REPLICATION_PRIORITY_HIGH:
+		i_assert(user->last_update >= REPLICATION_PRIORITY_HIGH_SECS);
+		return user->last_update - REPLICATION_PRIORITY_HIGH_SECS;
+	case REPLICATION_PRIORITY_SYNC:
+		i_assert(user->last_update >= REPLICATION_PRIORITY_HIGH_SECS);
+		return user->last_update - REPLICATION_PRIORITY_SYNC_SECS;
+	}
+	if (user->last_sync_failed) {
+		/* failures need to be retried at specific intervals */
+		return user->last_fast_sync +
+			replicator_failure_resync_interval;
+	}
+	/* full resyncs should be done at configured intervals */
+	return user->last_full_sync + replicator_full_sync_interval;
+}
+
+static int user_priority_cmp(const void *p1, const void *p2)
+{
+	const struct replicator_user *user1 = p1, *user2 = p2;
+	time_t next_sync1 = replicator_user_next_sync_time(user1);
+	time_t next_sync2 = replicator_user_next_sync_time(user2);
+	if (next_sync1 < next_sync2)
+		return -1;
+	if (next_sync1 > next_sync2)
+		return 1;
+	return 0;
+}
+
+struct replicator_queue *
+replicator_queue_init(unsigned int full_sync_interval,
+		      unsigned int failure_resync_interval)
+{
+	struct replicator_queue *queue;
+
+	/* priorityq callback needs to access these */
+	i_assert(replicator_full_sync_interval == 0 ||
+		 replicator_full_sync_interval == full_sync_interval);
+	replicator_full_sync_interval = full_sync_interval;
+	i_assert(replicator_failure_resync_interval == 0 ||
+		 replicator_failure_resync_interval == failure_resync_interval);
+	replicator_full_sync_interval = full_sync_interval;
+	replicator_failure_resync_interval = failure_resync_interval;
+
+	queue = i_new(struct replicator_queue, 1);
+	queue->full_sync_interval = full_sync_interval;
+	queue->failure_resync_interval = failure_resync_interval;
+	queue->user_queue = priorityq_init(user_priority_cmp, 1024);
+	hash_table_create(&queue->user_hash, default_pool, 1024,
+			  str_hash, strcmp);
+	i_array_init(&queue->sync_lookups, 32);
+	return queue;
+}
+
+void replicator_queue_deinit(struct replicator_queue **_queue)
+{
+	struct replicator_queue *queue = *_queue;
+	struct priorityq_item *item;
+
+	*_queue = NULL;
+
+	queue->change_callback = NULL;
+
+	while ((item = priorityq_pop(queue->user_queue)) != NULL) {
+		struct replicator_user *user = (struct replicator_user *)item;
+
+		user->popped = TRUE;
+		replicator_queue_remove(queue, &user);
+	}
+
+	priorityq_deinit(&queue->user_queue);
+	hash_table_destroy(&queue->user_hash);
+	i_assert(array_count(&queue->sync_lookups) == 0);
+	array_free(&queue->sync_lookups);
+	i_free(queue);
+}
+
+void replicator_queue_set_change_callback(struct replicator_queue *queue,
+					  void (*callback)(void *context),
+					  void *context)
+{
+	queue->change_callback = callback;
+	queue->change_context = context;
+}
+
+void replicator_user_ref(struct replicator_user *user)
+{
+	i_assert(user->refcount > 0);
+	user->refcount++;
+}
+
+bool replicator_user_unref(struct replicator_user **_user)
+{
+	struct replicator_user *user = *_user;
+
+	i_assert(user->refcount > 0);
+	*_user = NULL;
+	if (--user->refcount > 0)
+		return TRUE;
+
+	i_free(user->state);
+	i_free(user->username);
+	i_free(user);
+	return FALSE;
+}
+
+struct replicator_user *
+replicator_queue_lookup(struct replicator_queue *queue, const char *username)
+{
+	return hash_table_lookup(queue->user_hash, username);
+}
+
+struct replicator_user *
+replicator_queue_get(struct replicator_queue *queue, const char *username)
+{
+	struct replicator_user *user;
+
+	user = replicator_queue_lookup(queue, username);
+	if (user == NULL) {
+		user = i_new(struct replicator_user, 1);
+		user->refcount = 1;
+		user->username = i_strdup(username);
+		user->last_update = ioloop_time;
+		hash_table_insert(queue->user_hash, user->username, user);
+		if (!user->popped)
+			priorityq_add(queue->user_queue, &user->item);
+	}
+	return user;
+}
+
+void replicator_queue_update(struct replicator_queue *queue ATTR_UNUSED,
+			     struct replicator_user *user,
+			     enum replication_priority priority)
+{
+	if (user->priority >= priority) {
+		/* user already has at least this high priority */
+		return;
+	}
+	user->priority = priority;
+	user->last_update = ioloop_time;
+}
+
+void replicator_queue_add(struct replicator_queue *queue,
+			  struct replicator_user *user)
+{
+	if (!user->popped) {
+		priorityq_remove(queue->user_queue, &user->item);
+		priorityq_add(queue->user_queue, &user->item);
+	}
+	if (queue->change_callback != NULL)
+		queue->change_callback(queue->change_context);
+}
+
+void replicator_queue_add_sync_callback(struct replicator_queue *queue,
+					struct replicator_user *user,
+					replicator_sync_callback_t *callback,
+					void *context)
+{
+	struct replicator_sync_lookup *lookup;
+
+	i_assert(user->priority == REPLICATION_PRIORITY_SYNC);
+
+	lookup = array_append_space(&queue->sync_lookups);
+	lookup->user = user;
+	lookup->callback = callback;
+	lookup->context = context;
+	lookup->wait_for_next_push = user->popped;
+
+	replicator_queue_add(queue, user);
+}
+
+void replicator_queue_remove(struct replicator_queue *queue,
+			     struct replicator_user **_user)
+{
+	struct replicator_user *user = *_user;
+
+	*_user = NULL;
+	if (!user->popped)
+		priorityq_remove(queue->user_queue, &user->item);
+	hash_table_remove(queue->user_hash, user->username);
+	replicator_user_unref(&user);
+
+	if (queue->change_callback != NULL)
+		queue->change_callback(queue->change_context);
+}
+
+unsigned int replicator_queue_count(struct replicator_queue *queue)
+{
+	return priorityq_count(queue->user_queue);
+}
+
+bool replicator_queue_want_sync_now(struct replicator_user *user,
+				    unsigned int *next_secs_r)
+{
+	time_t next_sync = replicator_user_next_sync_time(user);
+	if (next_sync <= ioloop_time) {
+		*next_secs_r = 0;
+		return TRUE;
+	}
+	*next_secs_r = next_sync - ioloop_time;
+	return FALSE;
+}
+
+struct replicator_user *
+replicator_queue_peek(struct replicator_queue *queue,
+		      unsigned int *next_secs_r)
+{
+	struct priorityq_item *item;
+	struct replicator_user *user;
+
+	item = priorityq_peek(queue->user_queue);
+	if (item == NULL) {
+		/* no users defined. we shouldn't normally get here */
+		*next_secs_r = 3600;
+		return NULL;
+	}
+	user = (struct replicator_user *)item;
+	(void)replicator_queue_want_sync_now(user, next_secs_r);
+	return user;
+}
+
+struct replicator_user *
+replicator_queue_pop(struct replicator_queue *queue,
+		     unsigned int *next_secs_r)
+{
+	struct replicator_user *user;
+
+	user = replicator_queue_peek(queue, next_secs_r);
+	if (*next_secs_r > 0) {
+		/* we don't want to sync the user yet */
+		return NULL;
+	}
+	if (user != NULL) {
+		priorityq_remove(queue->user_queue, &user->item);
+		user->popped = TRUE;
+	}
+	return user;
+}
+
+static void
+replicator_queue_handle_sync_lookups(struct replicator_queue *queue,
+				     struct replicator_user *user)
+{
+	struct replicator_sync_lookup *lookups;
+	ARRAY(struct replicator_sync_lookup) callbacks;
+	unsigned int i, count;
+	bool success = !user->last_sync_failed;
+
+	t_array_init(&callbacks, 8);
+	lookups = array_get_modifiable(&queue->sync_lookups, &count);
+	for (i = 0; i < count; ) {
+		if (lookups[i].user != user)
+			i++;
+		else if (lookups[i].wait_for_next_push) {
+			/* another sync request came while user was being
+			   replicated */
+			i_assert(user->priority == REPLICATION_PRIORITY_SYNC);
+			lookups[i].wait_for_next_push = FALSE;
+			i++;
+		} else {
+			array_push_back(&callbacks, &lookups[i]);
+			array_delete(&queue->sync_lookups, i, 1);
+		}
+	}
+
+	array_foreach_modifiable(&callbacks, lookups)
+		lookups->callback(success, lookups->context);
+}
+
+void replicator_queue_push(struct replicator_queue *queue,
+			   struct replicator_user *user)
+{
+	i_assert(user->popped);
+
+	priorityq_add(queue->user_queue, &user->item);
+	user->popped = FALSE;
+
+	T_BEGIN {
+		replicator_queue_handle_sync_lookups(queue, user);
+	} T_END;
+}
+
+static int
+replicator_queue_import_line(struct replicator_queue *queue, const char *line)
+{
+	const char *const *args, *username, *state;
+	unsigned int priority;
+	struct replicator_user *user, tmp_user;
+
+	/* <user> <priority> <last update> <last fast sync> <last full sync>
+	   <last failed> <state> <last successful sync>*/
+	args = t_strsplit_tabescaped(line);
+	if (str_array_length(args) < 7)
+		return -1;
+
+	i_zero(&tmp_user);
+	username = args[0];
+	state = t_strdup_noconst(args[6]);
+	if (username[0] == '\0' ||
+	    str_to_uint(args[1], &priority) < 0 ||
+	    str_to_time(args[2], &tmp_user.last_update) < 0 ||
+	    str_to_time(args[3], &tmp_user.last_fast_sync) < 0 ||
+	    str_to_time(args[4], &tmp_user.last_full_sync) < 0)
+		return -1;
+	tmp_user.priority = priority;
+	tmp_user.last_sync_failed = args[5][0] != '0';
+
+	if (str_array_length(args) >= 8) { 
+		if (str_to_time(args[7], &tmp_user.last_successful_sync) < 0)
+			return -1;
+	} else {
+		tmp_user.last_successful_sync = 0;
+                /* On-disk format didn't have this yet */
+	}
+
+	user = hash_table_lookup(queue->user_hash, username);
+	if (user != NULL) {
+		if (user->last_update > tmp_user.last_update) {
+			/* we already have a newer state */
+			return 0;
+		}
+		if (user->last_update == tmp_user.last_update) {
+			/* either one of these could be newer. use the one
+			   with higher priority. */
+			if (user->priority > tmp_user.priority)
+				return 0;
+		}
+	} else {
+		user = replicator_queue_get(queue, username);
+	}
+	user->priority = tmp_user.priority;
+	user->last_update = tmp_user.last_update;
+	user->last_fast_sync = tmp_user.last_fast_sync;
+	user->last_full_sync = tmp_user.last_full_sync;
+	user->last_successful_sync = tmp_user.last_successful_sync;
+	user->last_sync_failed = tmp_user.last_sync_failed;
+	i_free(user->state);
+	user->state = i_strdup(state);
+	replicator_queue_add(queue, user);
+	return 0;
+}
+
+int replicator_queue_import(struct replicator_queue *queue, const char *path)
+{
+	struct istream *input;
+	const char *line;
+	int fd, ret = 0;
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1) {
+		if (errno == ENOENT)
+			return 0;
+		i_error("open(%s) failed: %m", path);
+		return -1;
+	}
+
+	input = i_stream_create_fd_autoclose(&fd, SIZE_MAX);
+	while ((line = i_stream_read_next_line(input)) != NULL) {
+		T_BEGIN {
+			ret = replicator_queue_import_line(queue, line);
+		} T_END;
+		if (ret < 0) {
+			i_error("Corrupted replicator record in %s: %s",
+				path, line);
+			break;
+		}
+	}
+	if (input->stream_errno != 0) {
+		i_error("read(%s) failed: %s", path, i_stream_get_error(input));
+		ret = -1;
+	}
+	i_stream_destroy(&input);
+	return ret;
+}
+
+static void
+replicator_queue_export_user(struct replicator_user *user, string_t *str)
+{
+	str_append_tabescaped(str, user->username);
+	str_printfa(str, "\t%d\t%lld\t%lld\t%lld\t%d\t", (int)user->priority,
+		    (long long)user->last_update,
+		    (long long)user->last_fast_sync,
+		    (long long)user->last_full_sync,
+		    user->last_sync_failed ? 1 : 0);
+	if (user->state != NULL)
+		str_append_tabescaped(str, user->state);
+	str_printfa(str, "\t%lld\n", (long long)user->last_successful_sync);
+}
+
+int replicator_queue_export(struct replicator_queue *queue, const char *path)
+{
+	struct replicator_queue_iter *iter;
+	struct replicator_user *user;
+	struct ostream *output;
+	string_t *str;
+	int fd, ret = 0;
+
+	fd = creat(path, 0600);
+	if (fd == -1) {
+		i_error("creat(%s) failed: %m", path);
+		return -1;
+	}
+	output = o_stream_create_fd_file_autoclose(&fd, 0);
+	o_stream_cork(output);
+
+	str = t_str_new(128);
+	iter = replicator_queue_iter_init(queue);
+	while ((user = replicator_queue_iter_next(iter)) != NULL) {
+		str_truncate(str, 0);
+		replicator_queue_export_user(user, str);
+		if (o_stream_send(output, str_data(str), str_len(str)) < 0)
+			break;
+	}
+	replicator_queue_iter_deinit(&iter);
+	if (o_stream_finish(output) < 0) {
+		i_error("write(%s) failed: %s", path, o_stream_get_error(output));
+		ret = -1;
+	}
+	o_stream_destroy(&output);
+	return ret;
+}
+
+struct replicator_queue_iter *
+replicator_queue_iter_init(struct replicator_queue *queue)
+{
+	struct replicator_queue_iter *iter;
+
+	iter = i_new(struct replicator_queue_iter, 1);
+	iter->queue = queue;
+	iter->iter = hash_table_iterate_init(queue->user_hash);
+	return iter;
+}
+
+struct replicator_user *
+replicator_queue_iter_next(struct replicator_queue_iter *iter)
+{
+	struct replicator_user *user;
+	char *username;
+
+	if (!hash_table_iterate(iter->iter, iter->queue->user_hash,
+				&username, &user))
+		return NULL;
+	return user;
+}
+
+void replicator_queue_iter_deinit(struct replicator_queue_iter **_iter)
+{
+	struct replicator_queue_iter *iter = *_iter;
+
+	*_iter = NULL;
+
+	hash_table_iterate_deinit(&iter->iter);
+	i_free(iter);
+}
diff --git a/src/replication/replicator/replicator-queue.h b/src/replication/replicator/replicator-queue.h
new file mode 100644
index 0000000..4e021e2
--- /dev/null
+++ b/src/replication/replicator/replicator-queue.h
@@ -0,0 +1,104 @@
+#ifndef REPLICATOR_QUEUE_H
+#define REPLICATOR_QUEUE_H
+
+#include "priorityq.h"
+#include "replication-common.h"
+
+struct replicator_user {
+	struct priorityq_item item;
+
+	char *username;
+	/* dsync state for incremental syncing */
+	char *state;
+	/* last time this user's state was updated */
+	time_t last_update;
+	/* last_fast_sync is always >= last_full_sync. */
+	time_t last_fast_sync, last_full_sync, last_successful_sync;
+
+	int refcount;
+	enum replication_priority priority;
+	/* User isn't currently in replication queue */
+	bool popped:1;
+	/* Last replication sync failed */
+	bool last_sync_failed:1;
+	/* Force a full sync on the next replication */
+	bool force_full_sync:1;
+};
+
+typedef void replicator_sync_callback_t(bool success, void *context);
+
+struct replicator_queue *
+replicator_queue_init(unsigned int full_sync_interval,
+		      unsigned int failure_resync_interval);
+void replicator_queue_deinit(struct replicator_queue **queue);
+
+/* Call the specified callback when data is added/removed/moved in queue
+   via _add(), _add_sync() or _remove() functions (not push/pop). */
+void replicator_queue_set_change_callback(struct replicator_queue *queue,
+					  void (*callback)(void *context),
+					  void *context);
+
+/* Reference the user */
+void replicator_user_ref(struct replicator_user *user);
+/* Unreference the user. Returns TRUE if refcount is still >0. */
+bool replicator_user_unref(struct replicator_user **user);
+
+/* Lookup an existing user */
+struct replicator_user *
+replicator_queue_lookup(struct replicator_queue *queue, const char *username);
+/* Lookup or create a user and return it. Afterwards replicator_queue_add()
+   must be called to add/move the user to the proper place in the queue. */
+struct replicator_user *
+replicator_queue_get(struct replicator_queue *queue, const char *username);
+/* Update user's priority if it's currently lower. */
+void replicator_queue_update(struct replicator_queue *queue,
+			     struct replicator_user *user,
+			     enum replication_priority priority);
+void replicator_queue_add(struct replicator_queue *queue,
+			  struct replicator_user *user);
+/* Call the callback when user with SYNC priority has finished syncing. */
+void replicator_queue_add_sync_callback(struct replicator_queue *queue,
+					struct replicator_user *user,
+					replicator_sync_callback_t *callback,
+					void *context);
+/* Remove user from replication queue and free it. */
+void replicator_queue_remove(struct replicator_queue *queue,
+			     struct replicator_user **user);
+/* Return the number of users in the queue. */
+unsigned int replicator_queue_count(struct replicator_queue *queue);
+
+/* Return the next user from replication queue and how many seconds from now
+   the returned user should be synced (0 = immediately). Returns NULL only if
+   there are no users in the queue. */
+struct replicator_user *
+replicator_queue_peek(struct replicator_queue *queue,
+		      unsigned int *next_secs_r);
+/* Return the next user from replication queue, and remove it from the queue.
+   If there's nothing to be replicated currently, returns NULL and sets
+   next_secs_r to when there should be more work to do. */
+struct replicator_user *
+replicator_queue_pop(struct replicator_queue *queue,
+		     unsigned int *next_secs_r);
+/* Add user back to queue. */
+void replicator_queue_push(struct replicator_queue *queue,
+			   struct replicator_user *user);
+
+int replicator_queue_import(struct replicator_queue *queue, const char *path);
+int replicator_queue_export(struct replicator_queue *queue, const char *path);
+
+/* Returns TRUE if user replication can be started now, FALSE if not. When
+   returning FALSE, next_secs_r is set to user's next replication time. */
+bool replicator_queue_want_sync_now(struct replicator_user *user,
+				    unsigned int *next_secs_r);
+/* Iterate through all users in the queue. */
+struct replicator_queue_iter *
+replicator_queue_iter_init(struct replicator_queue *queue);
+struct replicator_user *
+replicator_queue_iter_next(struct replicator_queue_iter *iter);
+void replicator_queue_iter_deinit(struct replicator_queue_iter **iter);
+
+void replicator_queue_add_auth_users(struct replicator_queue *queue,
+				     const char *auth_socket_path,
+				     const char *usermask, time_t last_update);
+
+#endif
diff --git a/src/replication/replicator/replicator-settings.c b/src/replication/replicator/replicator-settings.c
new file mode 100644
index 0000000..3965100
--- /dev/null
+++ b/src/replication/replicator/replicator-settings.c
@@ -0,0 +1,86 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "buffer.h"
+#include "settings-parser.h"
+#include "service-settings.h"
+#include "replicator-settings.h"
+
+/* <settings checks> */
+static struct file_listener_settings replicator_unix_listeners_array[] = {
+	{ "replicator", 0600, "$default_internal_user", "" },
+	{ "replicator-doveadm", 0, "$default_internal_user", "" }
+};
+static struct file_listener_settings *replicator_unix_listeners[] = {
+	&replicator_unix_listeners_array[0],
+	&replicator_unix_listeners_array[1]
+};
+static buffer_t replicator_unix_listeners_buf = {
+	{ { replicator_unix_listeners, sizeof(replicator_unix_listeners) } }
+};
+/* </settings checks> */
+
+struct service_settings replicator_service_settings = {
+	.name = "replicator",
+	.protocol = "",
+	.type = "",
+	.executable = "replicator",
+	.user = "",
+	.group = "",
+	.privileged_group = "",
+	.extra_groups = "",
+	.chroot = "",
+
+	.drop_priv_before_exec = FALSE,
+
+	.process_min_avail = 0,
+	.process_limit = 1,
+	.client_limit = 0,
+	.service_count = 0,
+	.idle_kill = UINT_MAX,
+	.vsz_limit = UOFF_T_MAX,
+
+	.unix_listeners = { { &replicator_unix_listeners_buf,
+			      sizeof(replicator_unix_listeners[0]) } },
+	.fifo_listeners = ARRAY_INIT,
+	.inet_listeners = ARRAY_INIT,
+
+	.process_limit_1 = TRUE
+};
+
+#undef DEF
+#define DEF(type, name) \
+	SETTING_DEFINE_STRUCT_##type(#name, name, struct replicator_settings)
+
+static const struct setting_define replicator_setting_defines[] = {
+	DEF(STR, auth_socket_path),
+	DEF(STR, doveadm_socket_path),
+	DEF(STR, replication_dsync_parameters),
+
+	DEF(TIME, replication_full_sync_interval),
+	DEF(UINT, replication_max_conns),
+
+	SETTING_DEFINE_LIST_END
+};
+
+const struct replicator_settings replicator_default_settings = {
+	.auth_socket_path = "auth-userdb",
+	.doveadm_socket_path = "doveadm-server",
+	.replication_dsync_parameters = "-d -N -l 30 -U",
+
+	.replication_full_sync_interval = 60*60*24,
+	.replication_max_conns = 10
+};
+
+const struct setting_parser_info replicator_setting_parser_info = {
+	.module_name = "replicator",
+	.defines = replicator_setting_defines,
+	.defaults = &replicator_default_settings,
+
+	.type_offset = SIZE_MAX,
+	.struct_size = sizeof(struct replicator_settings),
+
+	.parent_offset = SIZE_MAX
+};
+
+const struct replicator_settings *replicator_settings;
diff --git a/src/replication/replicator/replicator-settings.h b/src/replication/replicator/replicator-settings.h
new file mode 100644
index 0000000..947bcf8
--- /dev/null
+++ b/src/replication/replicator/replicator-settings.h
@@ -0,0 +1,16 @@
+#ifndef REPLICATOR_SETTINGS_H
+#define REPLICATOR_SETTINGS_H
+
+struct replicator_settings {
+	const char *auth_socket_path;
+	const char *doveadm_socket_path;
+	const char *replication_dsync_parameters;
+
+	unsigned int replication_full_sync_interval;
+	unsigned int replication_max_conns;
+};
+
+extern const struct setting_parser_info replicator_setting_parser_info;
+extern const struct replicator_settings *replicator_settings;
+
+#endif
diff --git a/src/replication/replicator/replicator.c b/src/replication/replicator/replicator.c
new file mode 100644
index 0000000..3600934
--- /dev/null
+++ b/src/replication/replicator/replicator.c
@@ -0,0 +1,117 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "restrict-access.h"
+#include "auth-master.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "notify-connection.h"
+#include "doveadm-connection.h"
+#include "replicator-brain.h"
+#include "replicator-queue.h"
+#include "replicator-settings.h"
+
+#define REPLICATOR_DB_DUMP_INTERVAL_MSECS (1000*60*15)
+/* if syncing fails, try again in 5 minutes */
+#define REPLICATOR_FAILURE_RESYNC_INTERVAL_SECS (60*5)
+#define REPLICATOR_DB_FNAME "replicator.db"
+
+static struct replicator_queue *queue;
+static struct replicator_brain *brain;
+static const struct master_service_settings *service_set;
+static const struct replicator_settings *set;
+static struct timeout *to_dump;
+
+static void client_connected(struct master_service_connection *conn)
+{
+	master_service_client_connection_accept(conn);
+	if (strcmp(conn->name, "replicator-doveadm") == 0)
+		doveadm_connection_create(brain, conn->fd);
+	else
+		(void)notify_connection_create(conn->fd, queue);
+}
+
+static void replication_add_users(struct replicator_queue *queue)
+{
+	const char *path;
+
+	replicator_queue_add_auth_users(queue, set->auth_socket_path, "*", 0);
+
+	/* add updates from replicator db, if it exists */
+	path = t_strconcat(service_set->state_dir, "/"REPLICATOR_DB_FNAME, NULL);
+	(void)replicator_queue_import(queue, path);
+}
+
+static void ATTR_NULL(1)
+replicator_dump_timeout(void *context ATTR_UNUSED)
+{
+	const char *path;
+
+	path = t_strconcat(service_set->state_dir, "/"REPLICATOR_DB_FNAME, NULL);
+	(void)replicator_queue_export(queue, path);
+}
+
+static void main_init(void)
+{
+	void **sets;
+
+	service_set = master_service_settings_get(master_service);
+	sets = master_service_settings_get_others(master_service);
+	set = sets[0];
+
+	queue = replicator_queue_init(set->replication_full_sync_interval,
+				      REPLICATOR_FAILURE_RESYNC_INTERVAL_SECS);
+	replication_add_users(queue);
+	to_dump = timeout_add(REPLICATOR_DB_DUMP_INTERVAL_MSECS,
+			      replicator_dump_timeout, NULL);
+	brain = replicator_brain_init(queue, set);
+	doveadm_connections_init();
+}
+
+static void main_deinit(void)
+{
+	const char *path;
+
+	doveadm_connections_deinit();
+	notify_connections_destroy_all();
+	replicator_brain_deinit(&brain);
+	timeout_remove(&to_dump);
+	path = t_strconcat(service_set->state_dir, "/"REPLICATOR_DB_FNAME, NULL);
+	(void)replicator_queue_export(queue, path);
+	replicator_queue_deinit(&queue);
+}
+
+int main(int argc, char *argv[])
+{
+	const struct setting_parser_info *set_roots[] = {
+		&replicator_setting_parser_info,
+		NULL
+	};
+	const enum master_service_flags service_flags =
+		MASTER_SERVICE_FLAG_NO_IDLE_DIE;
+	const char *error;
+
+	master_service = master_service_init("replicator", 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(master_service);
+
+	restrict_access_by_env(RESTRICT_ACCESS_FLAG_ALLOW_ROOT, NULL);
+	restrict_access_allow_coredumps(TRUE);
+	/* finish init before we get list of users from auth, because that
+	   can take long enough for master process to kill us otherwise. */
+	master_service_init_finish(master_service);
+
+	main_init();
+	master_service_run(master_service, client_connected);
+	main_deinit();
+
+	master_service_deinit(&master_service);
+        return 0;
+}
diff --git a/src/replication/replicator/test-replicator-queue.c b/src/replication/replicator/test-replicator-queue.c
new file mode 100644
index 0000000..9ffa5ff
--- /dev/null
+++ b/src/replication/replicator/test-replicator-queue.c
@@ -0,0 +1,260 @@
+/* Copyright (c) 2022 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "test-common.h"
+#include "replicator-queue.h"
+
+#define TEST_REPLICATION_FULL_SYNC_INTERVAL 60
+#define TEST_REPLICATION_FAILURE_RESYNC_INTERVAL 10
+
+static void test_replicator_queue(void)
+{
+	struct replicator_queue *queue;
+	struct replicator_user *user1, *user2, *user3, *user4;
+	unsigned int next_secs;
+
+	test_begin("replicator queue");
+	queue = replicator_queue_init(TEST_REPLICATION_FULL_SYNC_INTERVAL,
+				      TEST_REPLICATION_FAILURE_RESYNC_INTERVAL);
+	ioloop_time = time(NULL);
+
+	/* 1) Add users */
+
+	/* add the 1st user with priority=none */
+	user1 = replicator_queue_get(queue, "user1");
+	replicator_queue_update(queue, user1, REPLICATION_PRIORITY_NONE);
+	replicator_queue_add(queue, user1);
+	test_assert(replicator_queue_count(queue) == 1);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user1 && next_secs == 0);
+
+	/* add the 2nd user with priority=none */
+	user2 = replicator_queue_get(queue, "user2");
+	replicator_queue_update(queue, user2, REPLICATION_PRIORITY_NONE);
+	replicator_queue_add(queue, user2);
+	test_assert(replicator_queue_count(queue) == 2);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user1 && next_secs == 0);
+
+	/* add the 3rd user with priority=none */
+	user3 = replicator_queue_get(queue, "user3");
+	replicator_queue_update(queue, user3, REPLICATION_PRIORITY_NONE);
+	replicator_queue_add(queue, user3);
+	test_assert(replicator_queue_count(queue) == 3);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user1 && next_secs == 0);
+
+	/* 2) User hasn't been synced yet, but priority is updated */
+
+	/* update the 2nd user's priority to low */
+	user2 = replicator_queue_get(queue, "user2");
+	replicator_queue_update(queue, user2, REPLICATION_PRIORITY_LOW);
+	replicator_queue_add(queue, user2);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user2 && next_secs == 0);
+
+	/* update the 1st user's priority to high */
+	user1 = replicator_queue_get(queue, "user1");
+	replicator_queue_update(queue, user1, REPLICATION_PRIORITY_HIGH);
+	replicator_queue_add(queue, user1);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user1 && next_secs == 0);
+
+	/* update the 2nd user's priority to sync */
+	user2 = replicator_queue_get(queue, "user2");
+	replicator_queue_update(queue, user2, REPLICATION_PRIORITY_SYNC);
+	replicator_queue_add(queue, user2);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user2 && next_secs == 0);
+
+	/* 3) User hasn't been synced, and priority is being updated.
+	   user1 was synced 1 second before user2. */
+	user1->last_fast_sync = ioloop_time;
+	user1->last_full_sync = ioloop_time;
+	user1->priority = REPLICATION_PRIORITY_NONE;
+	replicator_queue_add(queue, user1);
+	ioloop_time++;
+	user2->last_fast_sync = ioloop_time;
+	user2->last_full_sync = ioloop_time;
+	user2->priority = REPLICATION_PRIORITY_NONE;
+	replicator_queue_add(queue, user2);
+	ioloop_time++;
+	user3->last_fast_sync = ioloop_time;
+	user3->last_full_sync = ioloop_time;
+	user3->priority = REPLICATION_PRIORITY_NONE;
+	replicator_queue_add(queue, user3);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user1 && next_secs > 0);
+
+	/* update the 2nd user's priority to low */
+	user2 = replicator_queue_get(queue, "user2");
+	replicator_queue_update(queue, user2, REPLICATION_PRIORITY_LOW);
+	replicator_queue_add(queue, user2);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user2 && next_secs == 0);
+
+	/* update the 1st user's priority to high */
+	user1 = replicator_queue_get(queue, "user1");
+	replicator_queue_update(queue, user1, REPLICATION_PRIORITY_HIGH);
+	replicator_queue_add(queue, user1);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user1 && next_secs == 0);
+
+	/* update the 2nd user's priority to sync */
+	user2 = replicator_queue_get(queue, "user2");
+	replicator_queue_update(queue, user2, REPLICATION_PRIORITY_SYNC);
+	replicator_queue_add(queue, user2);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user2 && next_secs == 0);
+
+	/* 4) Test failed sync with a new user */
+	user1->priority = REPLICATION_PRIORITY_NONE;
+	replicator_queue_add(queue, user1);
+	user2->priority = REPLICATION_PRIORITY_NONE;
+	replicator_queue_add(queue, user2);
+
+	user4 = replicator_queue_get(queue, "user4");
+	user4->last_fast_sync = ioloop_time - 5;
+	user4->last_sync_failed = TRUE;
+	replicator_queue_add(queue, user4);
+
+	test_assert(replicator_queue_count(queue) == 4);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user4 &&
+		    next_secs == TEST_REPLICATION_FAILURE_RESYNC_INTERVAL - 5);
+
+	/* low priority sync is prioritized over failed sync */
+	replicator_queue_update(queue, user1, REPLICATION_PRIORITY_LOW);
+	replicator_queue_add(queue, user1);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user1 && next_secs == 0);
+
+	/* However, if the last failure was old enough it will be before
+	   the low priority one. Test the edge case. */
+	user4->last_fast_sync = ioloop_time -
+		TEST_REPLICATION_FAILURE_RESYNC_INTERVAL -
+		(60*15) - 1;
+	replicator_queue_add(queue, user4);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user4 && next_secs == 0);
+	user4->last_fast_sync++;
+	replicator_queue_add(queue, user4);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user1 && next_secs == 0);
+
+	/* 5) Test priority starvation */
+
+	/* high priority is normally prioritized over low priority */
+	i_assert(user1->priority == REPLICATION_PRIORITY_LOW);
+	user2 = replicator_queue_get(queue, "user2");
+	replicator_queue_update(queue, user2, REPLICATION_PRIORITY_HIGH);
+	replicator_queue_add(queue, user2);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user2 && next_secs == 0);
+
+	/* if low priority is old enough, it gets prioritized over high */
+	user1->last_update = ioloop_time - (60*15) - 1;
+	replicator_queue_add(queue, user1);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user1 && next_secs == 0);
+	user1->last_update++;
+	replicator_queue_add(queue, user1);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user2 && next_secs == 0);
+
+	/* similarly low priority eventually gets prioritized over sync
+	   priority */
+	replicator_queue_update(queue, user2, REPLICATION_PRIORITY_SYNC);
+	replicator_queue_add(queue, user2);
+	user1->last_update = ioloop_time - (60*30) - 1;
+	replicator_queue_add(queue, user1);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user1 && next_secs == 0);
+	user1->last_update++;
+	replicator_queue_add(queue, user1);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user2 && next_secs == 0);
+
+	/* likewise for none priority also */
+	user1->priority = REPLICATION_PRIORITY_NONE;
+	user1->last_update = ioloop_time;
+	user1->last_fast_sync = ioloop_time;
+	user1->last_full_sync = ioloop_time - (60*45) -
+		TEST_REPLICATION_FULL_SYNC_INTERVAL - 1;
+	replicator_queue_add(queue, user1);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user1 && next_secs == 0);
+	user1->last_full_sync++;
+	replicator_queue_add(queue, user1);
+	test_assert(replicator_queue_peek(queue, &next_secs) == user2 && next_secs == 0);
+
+	replicator_queue_deinit(&queue);
+	test_end();
+}
+
+static void test_replicator_queue_verify_drained(struct replicator_queue *queue)
+{
+	struct replicator_queue_iter *iter =
+		replicator_queue_iter_init(queue);
+	struct replicator_user *user;
+	while ((user = replicator_queue_iter_next(iter)) != NULL) {
+		i_assert(user->priority == REPLICATION_PRIORITY_NONE);
+		i_assert(user->last_sync_failed ||
+			 ioloop_time - user->last_full_sync < TEST_REPLICATION_FULL_SYNC_INTERVAL);
+	}
+	replicator_queue_iter_deinit(&iter);
+}
+
+static void test_replicator_queue_drain(struct replicator_queue *queue)
+{
+	struct replicator_user *user;
+	unsigned int next_secs;
+	enum replication_priority prev_priority = REPLICATION_PRIORITY_SYNC;
+	time_t prev_sync = INT_MAX;
+
+	while ((user = replicator_queue_pop(queue, &next_secs)) != NULL) {
+		if (user->priority < prev_priority) {
+			prev_sync = INT_MAX;
+		} else {
+			test_assert(user->priority == prev_priority);
+			if (user->priority == REPLICATION_PRIORITY_NONE) {
+				test_assert(user->last_full_sync <= prev_sync);
+				prev_sync = user->last_full_sync;
+			} else {
+				test_assert(user->last_fast_sync <= prev_sync);
+				prev_sync = user->last_fast_sync;
+			}
+		}
+		user->priority = REPLICATION_PRIORITY_NONE;
+		user->last_fast_sync = user->last_full_sync = ioloop_time-1;
+		/* dsync runs here */
+		if (i_rand_limit(5) == 0)
+			user->last_sync_failed = TRUE;
+		else {
+			user->last_successful_sync = ioloop_time;
+			user->last_sync_failed = FALSE;
+		}
+		replicator_queue_push(queue, user);
+	}
+	test_replicator_queue_verify_drained(queue);
+}
+
+static void test_replicator_queue_random(void)
+{
+	struct replicator_queue *queue;
+	struct replicator_user *user;
+
+	test_begin("replicator queue random");
+	queue = replicator_queue_init(TEST_REPLICATION_FULL_SYNC_INTERVAL,
+				      TEST_REPLICATION_FAILURE_RESYNC_INTERVAL);
+	/* fill some users */
+	ioloop_time = time(NULL);
+	for (unsigned int i = 0; i < 1000; i++) T_BEGIN {
+		enum replication_priority priority =
+			i_rand_minmax(REPLICATION_PRIORITY_NONE,
+				      REPLICATION_PRIORITY_SYNC);
+		const char *username =
+			t_strdup_printf("test%u", i_rand_minmax(1, 200));
+		user = replicator_queue_get(queue, username);
+		replicator_queue_update(queue, user, priority);
+		replicator_queue_add(queue, user);
+		ioloop_time++;
+	} T_END;
+	for (unsigned int i = 0; i < 1000; i++) {
+		test_replicator_queue_drain(queue);
+		ioloop_time++;
+	}
+	replicator_queue_deinit(&queue);
+	test_end();
+}
+
+int main(void)
+{
+	static void (*const test_functions[])(void) = {
+		test_replicator_queue,
+		test_replicator_queue_random,
+		NULL
+	};
+	return test_run(test_functions);
+}