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

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

10 files changed, 1649 insertions, 0 deletions

diff --git a/src/ipc/Makefile.am b/src/ipc/Makefile.am
new file mode 100644
index 0000000..a12609e
--- /dev/null
+++ b/src/ipc/Makefile.am
@@ -0,0 +1,25 @@
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+
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+	ipc-group.c \
+	ipc-settings.c
+
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+	ipc-group.h
diff --git a/src/ipc/Makefile.in b/src/ipc/Makefile.in
new file mode 100644
index 0000000..cf887d3
--- /dev/null
+++ b/src/ipc/Makefile.in
@@ -0,0 +1,825 @@
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+	$(BINARY_CFLAGS)
+
+ipc_LDADD = $(LIBDOVECOT) \
+	$(BINARY_LDFLAGS)
+
+ipc_DEPENDENCIES = $(LIBDOVECOT_DEPS)
+ipc_SOURCES = \
+	client.c \
+	main.c \
+	ipc-connection.c \
+	ipc-group.c \
+	ipc-settings.c
+
+noinst_HEADERS = \
+	client.h \
+	ipc-connection.h \
+	ipc-group.h
+
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .lo .o .obj
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/ipc/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/ipc/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
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+	esac;
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+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(pkglibexecdir)'"; \
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+	fi; \
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+	sed 's/$(EXEEXT)$$//' | \
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+	 || test -f $$p1 \
+	  ; then echo "$$p"; echo "$$p"; else :; fi; \
+	done | \
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+	sed 'N;N;N;s,\n, ,g' | \
+	$(AWK) 'BEGIN { files["."] = ""; dirs["."] = 1 } \
+	  { d=$$3; if (dirs[d] != 1) { print "d", d; dirs[d] = 1 } \
+	    if ($$2 == $$4) files[d] = files[d] " " $$1; \
+	    else { print "f", $$3 "/" $$4, $$1; } } \
+	  END { for (d in files) print "f", d, files[d] }' | \
+	while read type dir files; do \
+	    if test "$$dir" = .; then dir=; else dir=/$$dir; fi; \
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+	    $(INSTALL_PROGRAM_ENV) $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL_PROGRAM) $$files "$(DESTDIR)$(pkglibexecdir)$$dir" || exit $$?; \
+	    } \
+	; done
+
+uninstall-pkglibexecPROGRAMS:
+	@$(NORMAL_UNINSTALL)
+	@list='$(pkglibexec_PROGRAMS)'; test -n "$(pkglibexecdir)" || list=; \
+	files=`for p in $$list; do echo "$$p"; done | \
+	  sed -e 'h;s,^.*/,,;s/$(EXEEXT)$$//;$(transform)' \
+	      -e 's/$$/$(EXEEXT)/' \
+	`; \
+	test -n "$$list" || exit 0; \
+	echo " ( cd '$(DESTDIR)$(pkglibexecdir)' && rm -f" $$files ")"; \
+	cd "$(DESTDIR)$(pkglibexecdir)" && rm -f $$files
+
+clean-pkglibexecPROGRAMS:
+	@list='$(pkglibexec_PROGRAMS)'; test -n "$$list" || exit 0; \
+	echo " rm -f" $$list; \
+	rm -f $$list || exit $$?; \
+	test -n "$(EXEEXT)" || exit 0; \
+	list=`for p in $$list; do echo "$$p"; done | sed 's/$(EXEEXT)$$//'`; \
+	echo " rm -f" $$list; \
+	rm -f $$list
+
+ipc$(EXEEXT): $(ipc_OBJECTS) $(ipc_DEPENDENCIES) $(EXTRA_ipc_DEPENDENCIES) 
+	@rm -f ipc$(EXEEXT)
+	$(AM_V_CCLD)$(LINK) $(ipc_OBJECTS) $(ipc_LDADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/client.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ipc-connection.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ipc-group.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ipc-settings.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/main.Po@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.c.o:
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+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LTCOMPILE) -c -o $@ $<
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+	-rm -f *.lo
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+clean-libtool:
+	-rm -rf .libs _libs
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+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
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+	set x; \
+	here=`pwd`; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
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+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+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
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+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
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+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
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+installcheck: installcheck-am
+install-strip:
+	if test -z '$(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:
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+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
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+clean-am: clean-generic clean-libtool clean-pkglibexecPROGRAMS \
+	mostlyclean-am
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+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/client.Po
+	-rm -f ./$(DEPDIR)/ipc-connection.Po
+	-rm -f ./$(DEPDIR)/ipc-group.Po
+	-rm -f ./$(DEPDIR)/ipc-settings.Po
+	-rm -f ./$(DEPDIR)/main.Po
+	-rm -f Makefile
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+	distclean-tags
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+		-rm -f ./$(DEPDIR)/client.Po
+	-rm -f ./$(DEPDIR)/ipc-connection.Po
+	-rm -f ./$(DEPDIR)/ipc-group.Po
+	-rm -f ./$(DEPDIR)/ipc-settings.Po
+	-rm -f ./$(DEPDIR)/main.Po
+	-rm -f Makefile
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+.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 \
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+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/ipc/client.c b/src/ipc/client.c
new file mode 100644
index 0000000..483452e
--- /dev/null
+++ b/src/ipc/client.c
@@ -0,0 +1,157 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "llist.h"
+#include "ioloop.h"
+#include "istream.h"
+#include "ostream.h"
+#include "master-service.h"
+#include "ipc-group.h"
+#include "ipc-connection.h"
+#include "client.h"
+
+#include <unistd.h>
+
+struct client {
+	struct client *prev, *next;
+
+	int fd;
+	struct io *io;
+	struct istream *input;
+	struct ostream *output;
+};
+
+static struct client *clients;
+
+static void client_input(struct client *client);
+
+static void
+client_cmd_input(enum ipc_cmd_status status, const char *line, void *context)
+{
+	struct client *client = context;
+	char chr = '\0';
+
+	switch (status) {
+	case IPC_CMD_STATUS_REPLY:
+		chr = ':';
+		break;
+	case IPC_CMD_STATUS_OK:
+		chr = '+';
+		break;
+	case IPC_CMD_STATUS_ERROR:
+		chr = '-';
+		break;
+	}
+
+	T_BEGIN {
+		o_stream_nsend_str(client->output,
+				   t_strdup_printf("%c%s\n", chr, line));
+	} T_END;
+
+	if (status != IPC_CMD_STATUS_REPLY && client->io == NULL) {
+		client->io = io_add(client->fd, IO_READ, client_input, client);
+		client_input(client);
+	}
+}
+
+static void client_input(struct client *client)
+{
+	struct ipc_group *group;
+	struct ipc_connection *conn;
+	char *line, *id, *data;
+	unsigned int id_num;
+	bool ret;
+
+	while ((line = i_stream_read_next_line(client->input)) != NULL) {
+		/* <ipc name> *|<id> <command> */
+		id = strchr(line, '\t');
+		if (id == NULL)
+			data = NULL;
+		else {
+			*id++ = '\0';
+			data = strchr(id, '\t');
+		}
+		if (data == NULL || data[1] == '\0') {
+			o_stream_nsend_str(client->output, "-Invalid input\n");
+			continue;
+		}
+		*data++ = '\0';
+
+		group = ipc_group_lookup_name(line);
+
+		ret = FALSE;
+		if (strcmp(id, "*") == 0) {
+			/* send to everyone */
+			if (group == NULL) {
+				client_cmd_input(IPC_CMD_STATUS_OK, "", client);
+			} else {
+				ret = ipc_group_cmd(group, data,
+						    client_cmd_input, client);
+			}
+		} else if (str_to_uint(id, &id_num) < 0) {
+			o_stream_nsend_str(client->output,
+				t_strdup_printf("-Invalid IPC connection id: %s\n", id));
+			continue;
+		} else if (group == NULL) {
+			o_stream_nsend_str(client->output,
+				t_strdup_printf("-Unknown IPC group: %s\n", line));
+		} else if ((conn = ipc_connection_lookup_id(group, id_num)) == NULL) {
+			o_stream_nsend_str(client->output,
+				t_strdup_printf("-Unknown IPC connection id: %u\n", id_num));
+			continue;
+		} else {
+			ipc_connection_cmd(conn, data, client_cmd_input, client);
+			ret = TRUE;
+		}
+
+		if (ret) {
+			/* we'll handle commands one at a time. stop reading
+			   input until this command is finished. */
+			io_remove(&client->io);
+			break;
+		}
+	}
+	if (client->input->eof || client->input->stream_errno != 0)
+		client_destroy(&client);
+}
+
+struct client *client_create(int fd)
+{
+	struct client *client;
+
+	client = i_new(struct client, 1);
+	client->fd = fd;
+	client->io = io_add(fd, IO_READ, client_input, client);
+	client->input = i_stream_create_fd(fd, SIZE_MAX);
+	client->output = o_stream_create_fd(fd, SIZE_MAX);
+	o_stream_set_no_error_handling(client->output, TRUE);
+
+	DLLIST_PREPEND(&clients, client);
+	return client;
+}
+
+void client_destroy(struct client **_client)
+{
+	struct client *client = *_client;
+
+	*_client = NULL;
+
+	DLLIST_REMOVE(&clients, client);
+	io_remove(&client->io);
+	i_stream_destroy(&client->input);
+	o_stream_destroy(&client->output);
+	if (close(client->fd) < 0)
+		i_error("close(client) failed: %m");
+	i_free(client);
+
+	master_service_client_connection_destroyed(master_service);
+}
+
+void clients_destroy_all(void)
+{
+	while (clients != NULL) {
+		struct client *client = clients;
+
+		client_destroy(&client);
+	}
+}
diff --git a/src/ipc/client.h b/src/ipc/client.h
new file mode 100644
index 0000000..a5936a6
--- /dev/null
+++ b/src/ipc/client.h
@@ -0,0 +1,9 @@
+#ifndef CLIENT_H
+#define CLIENT_H
+
+struct client *client_create(int fd);
+void client_destroy(struct client **client);
+
+void clients_destroy_all(void);
+
+#endif
diff --git a/src/ipc/ipc-connection.c b/src/ipc/ipc-connection.c
new file mode 100644
index 0000000..763752a
--- /dev/null
+++ b/src/ipc/ipc-connection.c
@@ -0,0 +1,253 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "ioloop.h"
+#include "istream.h"
+#include "ostream.h"
+#include "llist.h"
+#include "strescape.h"
+#include "master-service.h"
+#include "ipc-group.h"
+#include "ipc-connection.h"
+
+#include <unistd.h>
+
+#define IPC_SERVER_PROTOCOL_MAJOR_VERSION 1
+#define IPC_SERVER_PROTOCOL_MINOR_VERSION 0
+
+#define IPC_SERVER_HANDSHAKE "VERSION\tipc-proxy\t1\t0\n"
+
+static unsigned int connection_id_counter;
+
+static void ipc_connection_cmd_free(struct ipc_connection_cmd **_cmd,
+				    const char *reason)
+{
+	struct ipc_connection_cmd *cmd = *_cmd;
+	struct ipc_connection_cmd **cmds;
+	unsigned int i, count;
+
+	*_cmd = NULL;
+
+	cmds = array_get_modifiable(&cmd->conn->cmds, &count);
+	for (i = 0; i < count; i++) {
+		if (cmds[i] == cmd) {
+			array_delete(&cmd->conn->cmds, i, 1);
+			break;
+		}
+	}
+	if (cmd->callback != NULL) {
+		i_assert(reason != NULL);
+		cmd->callback(IPC_CMD_STATUS_ERROR, reason, cmd->context);
+	}
+	i_free(cmd);
+}
+
+static struct ipc_connection_cmd *
+ipc_connection_cmd_find(struct ipc_connection *conn, unsigned int tag)
+{
+	struct ipc_connection_cmd *cmd;
+
+	array_foreach_elem(&conn->cmds, cmd) {
+		if (cmd->tag == tag)
+			return cmd;
+	}
+	return NULL;
+}
+
+static int
+ipc_connection_input_line(struct ipc_connection *conn, char *line)
+{
+	struct ipc_connection_cmd *cmd;
+	unsigned int tag;
+	enum ipc_cmd_status status;
+	char *data;
+
+	/* <tag> [:+-]<data> */
+	data = strchr(line, '\t');
+	if (data == NULL)
+		return -1;
+
+	*data++ = '\0';
+	if (str_to_uint(line, &tag) < 0)
+		return -1;
+
+	switch (data[0]) {
+	case ':':
+		status = IPC_CMD_STATUS_REPLY;
+		break;
+	case '+':
+		status = IPC_CMD_STATUS_OK;
+		break;
+	case '-':
+		status = IPC_CMD_STATUS_ERROR;
+		break;
+	default:
+		return -1;
+	}
+	data++;
+
+	cmd = ipc_connection_cmd_find(conn, tag);
+	if (cmd == NULL) {
+		i_error("IPC server: Input for unexpected command tag %u", tag);
+		return 0;
+	}
+	cmd->callback(status, data, cmd->context);
+	if (status != IPC_CMD_STATUS_REPLY) {
+		cmd->callback = NULL;
+		ipc_connection_cmd_free(&cmd, NULL);
+	}
+	return 0;
+}
+
+static void ipc_connection_input(struct ipc_connection *conn)
+{
+	const char *const *args;
+	char *line;
+	int ret;
+
+	if (i_stream_read(conn->input) < 0) {
+		ipc_connection_destroy(&conn, FALSE,
+			i_stream_get_disconnect_reason(conn->input));
+		return;
+	}
+
+	if (!conn->version_received) {
+		if ((line = i_stream_next_line(conn->input)) == NULL)
+			return;
+
+		if (!version_string_verify(line, "ipc-server",
+				IPC_SERVER_PROTOCOL_MAJOR_VERSION)) {
+			ipc_connection_destroy(&conn, TRUE,
+				"IPC server not compatible with this server "
+				"(mixed old and new binaries?)");
+			return;
+		}
+		conn->version_received = TRUE;
+	}
+	if (!conn->handshake_received) {
+		if ((line = i_stream_next_line(conn->input)) == NULL)
+			return;
+
+		args = t_strsplit_tabescaped(line);
+		if (str_array_length(args) < 3 ||
+		    strcmp(args[0], "HANDSHAKE") != 0) {
+			ipc_connection_destroy(&conn, TRUE,
+				"IPC server sent invalid handshake");
+			return;
+		}
+		if (ipc_group_update_name(conn->group, args[1]) < 0) {
+			ipc_connection_destroy(&conn, TRUE, t_strdup_printf(
+				"IPC server named itself unexpectedly: %s "
+				"(existing ones were %s)",
+				args[1], conn->group->name));
+			return;
+		}
+		if (str_to_pid(args[2], &conn->pid) < 0) {
+			ipc_connection_destroy(&conn, TRUE, t_strdup_printf(
+				"IPC server gave broken PID: %s", args[2]));
+			return;
+		}
+		conn->handshake_received = TRUE;
+	}
+
+	while ((line = i_stream_next_line(conn->input)) != NULL) {
+		T_BEGIN {
+			ret = ipc_connection_input_line(conn, line);
+		} T_END;
+		if (ret < 0) {
+			ipc_connection_destroy(&conn, TRUE, t_strdup_printf(
+				"Invalid input from IPC server '%s': %s",
+				conn->group->name, line));
+			break;
+		}
+	}
+}
+
+struct ipc_connection *ipc_connection_create(int listen_fd, int fd)
+{
+	struct ipc_connection *conn;
+
+	conn = i_new(struct ipc_connection, 1);
+	conn->group = ipc_group_lookup_listen_fd(listen_fd);
+	if (conn->group == NULL)
+		conn->group = ipc_group_alloc(listen_fd);
+	conn->id = ++connection_id_counter;
+	if (conn->id == 0)
+		conn->id = ++connection_id_counter;
+	conn->fd = fd;
+	conn->io = io_add(fd, IO_READ, ipc_connection_input, conn);
+	conn->input = i_stream_create_fd(fd, SIZE_MAX);
+	conn->output = o_stream_create_fd(fd, SIZE_MAX);
+	o_stream_set_no_error_handling(conn->output, TRUE);
+	i_array_init(&conn->cmds, 8);
+	o_stream_nsend_str(conn->output, IPC_SERVER_HANDSHAKE);
+
+	DLLIST_PREPEND(&conn->group->connections, conn);
+	return conn;
+}
+
+void ipc_connection_destroy(struct ipc_connection **_conn,
+			    bool log_error, const char *error)
+{
+	struct ipc_connection *conn = *_conn;
+	struct ipc_connection_cmd *const *cmdp, *cmd;
+	const char *group_name = conn->group->name != NULL ?
+		conn->group->name :
+		t_strdup_printf("#%d", conn->group->listen_fd);
+
+	*_conn = NULL;
+
+	error = t_strdup_printf("IPC: '%s' PID %d server connection: %s",
+				group_name, conn->pid, error);
+	if (log_error)
+		i_error("%s", error);
+	DLLIST_REMOVE(&conn->group->connections, conn);
+
+	while (array_count(&conn->cmds) > 0) {
+		cmdp = array_front(&conn->cmds);
+		cmd = *cmdp;
+
+		ipc_connection_cmd_free(&cmd, error);
+	}
+	array_free(&conn->cmds);
+
+	io_remove(&conn->io);
+	i_stream_destroy(&conn->input);
+	o_stream_destroy(&conn->output);
+	if (close(conn->fd) < 0)
+		i_error("close(ipc connection) failed: %m");
+	i_free(conn);
+
+	master_service_client_connection_destroyed(master_service);
+}
+
+struct ipc_connection *
+ipc_connection_lookup_id(struct ipc_group *group, unsigned int id)
+{
+	struct ipc_connection *conn;
+
+	for (conn = group->connections; conn != NULL; conn = conn->next) {
+		if (conn->id == id)
+			return conn;
+	}
+	return NULL;
+}
+
+void ipc_connection_cmd(struct ipc_connection *conn, const char *cmd,
+			ipc_cmd_callback_t *callback, void *context)
+{
+	struct ipc_connection_cmd *ipc_cmd;
+
+	ipc_cmd = i_new(struct ipc_connection_cmd, 1);
+	ipc_cmd->tag = ++conn->cmd_tag_counter;
+	ipc_cmd->conn = conn;
+	ipc_cmd->callback = callback;
+	ipc_cmd->context = context;
+	array_push_back(&conn->cmds, &ipc_cmd);
+
+	T_BEGIN {
+		o_stream_nsend_str(conn->output,
+			t_strdup_printf("%u\t%s\n", ipc_cmd->tag, cmd));
+	} T_END;
+}
diff --git a/src/ipc/ipc-connection.h b/src/ipc/ipc-connection.h
new file mode 100644
index 0000000..d848f81
--- /dev/null
+++ b/src/ipc/ipc-connection.h
@@ -0,0 +1,46 @@
+#ifndef IPC_CONNECTION_H
+#define IPC_CONNECTION_H
+
+#include "ipc-group.h"
+
+struct ipc_connection_cmd {
+	unsigned int tag;
+	struct ipc_connection *conn;
+
+	ipc_cmd_callback_t *callback;
+	void *context;
+};
+
+struct ipc_connection {
+	struct ipc_group *group;
+	/* prev/next within group */
+	struct ipc_connection *prev, *next;
+
+	unsigned int id;
+	pid_t pid;
+
+	int fd;
+	struct io *io;
+	struct istream *input;
+	struct ostream *output;
+
+	unsigned int cmd_tag_counter;
+
+	/* running commands */
+	ARRAY(struct ipc_connection_cmd *) cmds;
+
+	bool version_received:1;
+	bool handshake_received:1;
+};
+
+struct ipc_connection *ipc_connection_create(int listen_fd, int fd);
+void ipc_connection_destroy(struct ipc_connection **conn,
+			    bool log_error, const char *error);
+
+struct ipc_connection *
+ipc_connection_lookup_id(struct ipc_group *group, unsigned int id);
+
+void ipc_connection_cmd(struct ipc_connection *conn, const char *cmd,
+			ipc_cmd_callback_t *callback, void *context);
+
+#endif
diff --git a/src/ipc/ipc-group.c b/src/ipc/ipc-group.c
new file mode 100644
index 0000000..9451419
--- /dev/null
+++ b/src/ipc/ipc-group.c
@@ -0,0 +1,166 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "ipc-connection.h"
+#include "ipc-group.h"
+
+struct ipc_group_cmd {
+	ipc_cmd_callback_t *callback;
+	void *context;
+
+	int refcount;
+	char *first_error;
+};
+
+static ARRAY(struct ipc_group *) ipc_groups;
+
+struct ipc_group *ipc_group_alloc(int listen_fd)
+{
+	struct ipc_group *group;
+
+	i_assert(ipc_group_lookup_listen_fd(listen_fd) == NULL);
+
+	group = i_new(struct ipc_group, 1);
+	group->listen_fd = listen_fd;
+	array_push_back(&ipc_groups, &group);
+	return group;
+}
+
+void ipc_group_free(struct ipc_group **_group)
+{
+	struct ipc_group *const *groups, *group = *_group;
+	unsigned int i, count;
+
+	i_assert(group->connections == NULL);
+
+	*_group = NULL;
+	groups = array_get(&ipc_groups, &count);
+	for (i = 0; i < count; i++) {
+		if (groups[i] == group) {
+			array_delete(&ipc_groups, i, 1);
+			break;
+		}
+	}
+	i_free(group->name);
+	i_free(group);
+}
+
+struct ipc_group *ipc_group_lookup_listen_fd(int listen_fd)
+{
+	struct ipc_group *group;
+
+	array_foreach_elem(&ipc_groups, group) {
+		if (group->listen_fd == listen_fd)
+			return group;
+	}
+	return NULL;
+}
+
+struct ipc_group *ipc_group_lookup_name(const char *name)
+{
+	struct ipc_group *group;
+
+	array_foreach_elem(&ipc_groups, group) {
+		if (group->name != NULL &&
+		    strcmp(group->name, name) == 0)
+			return group;
+	}
+	return NULL;
+}
+
+int ipc_group_update_name(struct ipc_group *group, const char *name)
+{
+	if (group->name == NULL)
+		group->name = i_strdup(name);
+	else if (strcmp(group->name, name) != 0)
+		return -1;
+	return 0;
+}
+
+static void ipc_group_cmd_callback(enum ipc_cmd_status status,
+				   const char *line, void *context)
+{
+	struct ipc_group_cmd *group_cmd = context;
+
+	i_assert(group_cmd->refcount > 0);
+
+	switch (status) {
+	case IPC_CMD_STATUS_REPLY:
+		group_cmd->callback(IPC_CMD_STATUS_REPLY, line,
+				    group_cmd->context);
+		break;
+	case IPC_CMD_STATUS_ERROR:
+		if (group_cmd->first_error == NULL)
+			group_cmd->first_error = i_strdup(line);
+		/* fall through */
+	case IPC_CMD_STATUS_OK:
+		if (--group_cmd->refcount > 0)
+			break;
+
+		if (group_cmd->first_error == NULL) {
+			group_cmd->callback(IPC_CMD_STATUS_OK, line,
+					    group_cmd->context);
+		} else {
+			group_cmd->callback(IPC_CMD_STATUS_ERROR,
+					    group_cmd->first_error,
+					    group_cmd->context);
+			i_free(group_cmd->first_error);
+		}
+		i_free(group_cmd);
+		break;
+	}
+
+}
+
+bool ipc_group_cmd(struct ipc_group *group, const char *cmd,
+		   ipc_cmd_callback_t *callback, void *context)
+{
+	struct ipc_connection *conn, *next;
+	struct ipc_group_cmd *group_cmd;
+
+	if (group->connections == NULL) {
+		callback(IPC_CMD_STATUS_OK, NULL, context);
+		return FALSE;
+	}
+
+	group_cmd = i_new(struct ipc_group_cmd, 1);
+	group_cmd->callback = callback;
+	group_cmd->context = context;
+
+	for (conn = group->connections; conn != NULL; conn = next) {
+		next = conn->next;
+
+		group_cmd->refcount++;
+		ipc_connection_cmd(conn, cmd,
+				   ipc_group_cmd_callback, group_cmd);
+	}
+	return TRUE;
+}
+
+void ipc_groups_init(void)
+{
+	i_array_init(&ipc_groups, 16);
+}
+
+void ipc_groups_disconnect_all(void)
+{
+	struct ipc_group *const *groupp, *group;
+
+	while (array_count(&ipc_groups) > 0) {
+		groupp = array_front(&ipc_groups);
+		group = *groupp;
+
+		while ((*groupp)->connections != NULL) {
+			struct ipc_connection *conn = (*groupp)->connections;
+			ipc_connection_destroy(&conn, FALSE, "Shutting down");
+		}
+		ipc_group_free(&group);
+	}
+}
+
+void ipc_groups_deinit(void)
+{
+	ipc_groups_disconnect_all();
+	array_free(&ipc_groups);
+}
diff --git a/src/ipc/ipc-group.h b/src/ipc/ipc-group.h
new file mode 100644
index 0000000..c993f5a
--- /dev/null
+++ b/src/ipc/ipc-group.h
@@ -0,0 +1,45 @@
+#ifndef IPC_GROUP_H
+#define IPC_GROUP_H
+
+enum ipc_cmd_status {
+	/* Command received a reply line */
+	IPC_CMD_STATUS_REPLY,
+	/* Command finished successfully */
+	IPC_CMD_STATUS_OK,
+	/* Command finished with errors */
+	IPC_CMD_STATUS_ERROR
+};
+
+struct ipc_group {
+	int listen_fd;
+	char *name;
+
+	/* connections list also acts as a refcount */
+	struct ipc_connection *connections;
+};
+
+/* line is non-NULL only with IPC_CMD_STATUS_REPLY.
+   Each line begins with the connection ID and TAB. */
+typedef void ipc_cmd_callback_t(enum ipc_cmd_status status,
+				const char *line, void *context);
+
+struct ipc_group *ipc_group_alloc(int listen_fd);
+void ipc_group_free(struct ipc_group **group);
+
+struct ipc_group *ipc_group_lookup_listen_fd(int listen_fd);
+struct ipc_group *ipc_group_lookup_name(const char *name);
+
+/* Returns 0 if name is ok, -1 if name doesn't match the existing one. */
+int ipc_group_update_name(struct ipc_group *group, const char *name);
+
+/* Send a command to all connections in a group. All connections are expected
+   to answer something. If there are no connections, callback() is called
+   immediately and FALSE is returned. */
+bool ipc_group_cmd(struct ipc_group *group, const char *cmd,
+		   ipc_cmd_callback_t *callback, void *context);
+
+void ipc_groups_init(void);
+void ipc_groups_deinit(void);
+void ipc_groups_disconnect_all(void);
+
+#endif
diff --git a/src/ipc/ipc-settings.c b/src/ipc/ipc-settings.c
new file mode 100644
index 0000000..664565c
--- /dev/null
+++ b/src/ipc/ipc-settings.c
@@ -0,0 +1,50 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "buffer.h"
+#include "settings-parser.h"
+#include "service-settings.h"
+
+#include <stddef.h>
+
+/* <settings checks> */
+static struct file_listener_settings ipc_unix_listeners_array[] = {
+	{ "ipc", 0600, "$default_internal_user", "" },
+	{ "login/ipc-proxy", 0600, "$default_login_user", "" }
+};
+static struct file_listener_settings *ipc_unix_listeners[] = {
+	&ipc_unix_listeners_array[0],
+	&ipc_unix_listeners_array[1]
+};
+static buffer_t ipc_unix_listeners_buf = {
+	{ { ipc_unix_listeners, sizeof(ipc_unix_listeners) } }
+};
+/* </settings checks> */
+
+struct service_settings ipc_service_settings = {
+	.name = "ipc",
+	.protocol = "",
+	.type = "",
+	.executable = "ipc",
+	.user = "$default_internal_user",
+	.group = "",
+	.privileged_group = "",
+	.extra_groups = "",
+	.chroot = "empty",
+
+	.drop_priv_before_exec = FALSE,
+
+	.process_min_avail = 0,
+	.process_limit = 1,
+	.client_limit = 0,
+	.service_count = 0,
+	.idle_kill = 0,
+	.vsz_limit = UOFF_T_MAX,
+
+	.unix_listeners = { { &ipc_unix_listeners_buf,
+			      sizeof(ipc_unix_listeners[0]) } },
+	.fifo_listeners = ARRAY_INIT,
+	.inet_listeners = ARRAY_INIT,
+
+	.process_limit_1 = TRUE
+};
diff --git a/src/ipc/main.c b/src/ipc/main.c
new file mode 100644
index 0000000..ebd4b22
--- /dev/null
+++ b/src/ipc/main.c
@@ -0,0 +1,73 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "restrict-access.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "ipc-group.h"
+#include "ipc-connection.h"
+#include "client.h"
+
+static bool ipc_socket_is_client(const char *name)
+{
+	size_t len;
+
+	if (strcmp(name, "ipc") == 0)
+		return TRUE;
+
+	len = strlen(name);
+	if (len > 7 && strcmp(name + len - 7, "-client") == 0)
+		return TRUE;
+	return FALSE;
+}
+
+static void client_connected(struct master_service_connection *conn)
+{
+	master_service_client_connection_accept(conn);
+
+	if (ipc_socket_is_client(conn->name))
+		(void)client_create(conn->fd);
+	else
+		(void)ipc_connection_create(conn->listen_fd, conn->fd);
+}
+
+static void ipc_die(void)
+{
+	clients_destroy_all();
+	ipc_groups_disconnect_all();
+}
+
+int main(int argc, char *argv[])
+{
+	const enum master_service_flags service_flags =
+		/* This process likely won't need to send any stats. It's also
+		   problematic because it's chrooted to empty directory, so it
+		   can't reconnect to stats if it gets disconnected. So at
+		   least for now disable connecting to stats entirely. */
+		MASTER_SERVICE_FLAG_DONT_SEND_STATS |
+		MASTER_SERVICE_FLAG_UPDATE_PROCTITLE;
+	const char *error;
+
+	master_service = master_service_init("ipc", service_flags,
+					     &argc, &argv, "");
+	if (master_getopt(master_service) > 0)
+		return FATAL_DEFAULT;
+	if (master_service_settings_read_simple(master_service,
+						NULL, &error) < 0)
+		i_fatal("Error reading configuration: %s", error);
+	master_service_init_log(master_service);
+	master_service_set_die_with_master(master_service, TRUE);
+	master_service_set_die_callback(master_service, ipc_die);
+
+	restrict_access_by_env(RESTRICT_ACCESS_FLAG_ALLOW_ROOT, NULL);
+	restrict_access_allow_coredumps(TRUE);
+	ipc_groups_init();
+	master_service_init_finish(master_service);
+
+	master_service_run(master_service, client_connected);
+
+	clients_destroy_all();
+	ipc_groups_deinit();
+	master_service_deinit(&master_service);
+        return 0;
+}