1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
7 Copyright 2013 Daniel Mack
8 Copyright 2014 Kay Sievers
10 systemd is free software; you can redistribute it and/or modify it
11 under the terms of the GNU Lesser General Public License as published by
12 the Free Software Foundation; either version 2.1 of the License, or
13 (at your option) any later version.
15 systemd is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Lesser General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public License
21 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 #include <sys/socket.h>
26 #include <sys/types.h>
37 #include "socket-util.h"
38 #include "sd-daemon.h"
40 #include "bus-internal.h"
41 #include "bus-message.h"
46 #include "capability.h"
47 #include "bus-policy.h"
49 static char *arg_address = NULL;
50 static char *arg_command_line_buffer = NULL;
51 static bool arg_drop_privileges = false;
52 static char **arg_configuration = NULL;
54 static int help(void) {
56 printf("%s [OPTIONS...]\n\n"
57 "Connect STDIO or a socket to a given bus address.\n\n"
58 " -h --help Show this help\n"
59 " --version Show package version\n"
60 " --drop-privileges Drop privileges\n"
61 " --configuration=PATH Configuration file or directory\n"
62 " --machine=MACHINE Connect to specified machine\n"
63 " --address=ADDRESS Connect to the bus specified by ADDRESS\n"
64 " (default: " DEFAULT_SYSTEM_BUS_PATH ")\n",
65 program_invocation_short_name);
70 static int parse_argv(int argc, char *argv[]) {
80 static const struct option options[] = {
81 { "help", no_argument, NULL, 'h' },
82 { "version", no_argument, NULL, ARG_VERSION },
83 { "address", required_argument, NULL, ARG_ADDRESS },
84 { "drop-privileges", no_argument, NULL, ARG_DROP_PRIVILEGES },
85 { "configuration", required_argument, NULL, ARG_CONFIGURATION },
86 { "machine", required_argument, NULL, ARG_MACHINE },
95 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
104 puts(PACKAGE_STRING);
105 puts(SYSTEMD_FEATURES);
120 case ARG_DROP_PRIVILEGES:
121 arg_drop_privileges = true;
124 case ARG_CONFIGURATION:
125 r = strv_extend(&arg_configuration, optarg);
131 _cleanup_free_ char *e = NULL;
134 e = bus_address_escape(optarg);
139 a = strjoin("x-container-kernel:machine=", e, ";x-container-unix:machine=", e, NULL);
141 a = strjoin("x-container-unix:machine=", e, NULL);
156 assert_not_reached("Unhandled option");
159 /* If the first command line argument is only "x" characters
160 * we'll write who we are talking to into it, so that "ps" is
162 arg_command_line_buffer = argv[optind];
163 if (argc > optind + 1 || (arg_command_line_buffer && !in_charset(arg_command_line_buffer, "x"))) {
164 log_error("Too many arguments");
169 arg_address = strdup(DEFAULT_SYSTEM_BUS_PATH);
177 static int rename_service(sd_bus *a, sd_bus *b) {
178 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
179 _cleanup_free_ char *p = NULL, *name = NULL;
189 r = sd_bus_get_peer_creds(b, SD_BUS_CREDS_UID|SD_BUS_CREDS_PID|SD_BUS_CREDS_CMDLINE|SD_BUS_CREDS_COMM, &creds);
193 r = sd_bus_creds_get_uid(creds, &uid);
197 r = sd_bus_creds_get_pid(creds, &pid);
201 r = sd_bus_creds_get_cmdline(creds, &cmdline);
205 r = sd_bus_creds_get_comm(creds, &comm);
209 name = uid_to_name(uid);
213 p = strv_join(cmdline, " ");
217 /* The status string gets the full command line ... */
219 "STATUS=Processing requests from client PID "PID_FMT" (%s); UID "UID_FMT" (%s)",
223 /* ... and the argv line only the short comm */
224 if (arg_command_line_buffer) {
227 m = strlen(arg_command_line_buffer);
228 w = snprintf(arg_command_line_buffer, m,
229 "[PID "PID_FMT"/%s; UID "UID_FMT"/%s]",
234 memzero(arg_command_line_buffer + w, m - w);
237 log_debug("Running on behalf of PID "PID_FMT" (%s), UID "UID_FMT" (%s), %s",
245 static int synthesize_name_acquired(sd_bus *a, sd_bus *b, sd_bus_message *m) {
246 _cleanup_bus_message_unref_ sd_bus_message *n = NULL;
247 const char *name, *old_owner, *new_owner;
254 /* If we get NameOwnerChanged for our own name, we need to
255 * synthesize NameLost/NameAcquired, since socket clients need
256 * that, even though it is obsoleted on kdbus */
261 if (!sd_bus_message_is_signal(m, "org.freedesktop.DBus", "NameOwnerChanged") ||
262 !streq_ptr(m->path, "/org/freedesktop/DBus") ||
263 !streq_ptr(m->sender, "org.freedesktop.DBus"))
266 r = sd_bus_message_read(m, "sss", &name, &old_owner, &new_owner);
270 r = sd_bus_message_rewind(m, true);
274 if (streq(old_owner, a->unique_name)) {
276 r = sd_bus_message_new_signal(
279 "/org/freedesktop/DBus",
280 "org.freedesktop.DBus",
283 } else if (streq(new_owner, a->unique_name)) {
285 r = sd_bus_message_new_signal(
288 "/org/freedesktop/DBus",
289 "org.freedesktop.DBus",
297 r = sd_bus_message_append(n, "s", name);
301 r = bus_message_append_sender(n, "org.freedesktop.DBus");
305 r = bus_seal_synthetic_message(b, n);
309 return sd_bus_send(b, n, NULL);
312 static int process_policy(sd_bus *a, sd_bus *b, sd_bus_message *m) {
313 _cleanup_bus_message_unref_ sd_bus_message *n = NULL;
323 if (!sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Properties", "GetAll"))
326 if (!streq_ptr(m->path, "/org/gnome/DisplayManager/Slave"))
329 r = sd_bus_message_new_method_errorf(m, &n, SD_BUS_ERROR_ACCESS_DENIED, "gdm, you are stupid");
333 r = bus_message_append_sender(n, "org.freedesktop.DBus");
335 log_error("Failed to append sender to gdm reply: %s", strerror(-r));
339 r = bus_seal_synthetic_message(b, n);
341 log_error("Failed to seal gdm reply: %s", strerror(-r));
345 r = sd_bus_send(b, n, NULL);
347 log_error("Failed to send gdm reply: %s", strerror(-r));
354 static int synthetic_driver_send(sd_bus *b, sd_bus_message *m) {
360 r = bus_message_append_sender(m, "org.freedesktop.DBus");
364 r = bus_seal_synthetic_message(b, m);
368 return sd_bus_send(b, m, NULL);
371 static int synthetic_reply_method_error(sd_bus_message *call, const sd_bus_error *e) {
372 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
377 if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
380 r = sd_bus_message_new_method_error(call, &m, e);
384 return synthetic_driver_send(call->bus, m);
387 static int synthetic_reply_method_errno(sd_bus_message *call, int error, const sd_bus_error *p) {
389 _cleanup_bus_error_free_ sd_bus_error berror = SD_BUS_ERROR_NULL;
393 if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
396 if (sd_bus_error_is_set(p))
397 return synthetic_reply_method_error(call, p);
399 sd_bus_error_set_errno(&berror, error);
401 return synthetic_reply_method_error(call, &berror);
404 static int synthetic_reply_method_return(sd_bus_message *call, const char *types, ...) {
405 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
410 if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
413 r = sd_bus_message_new_method_return(call, &m);
417 if (!isempty(types)) {
421 r = bus_message_append_ap(m, types, ap);
427 return synthetic_driver_send(call->bus, m);
430 static int synthetic_reply_return_strv(sd_bus_message *call, char **l) {
431 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
436 r = sd_bus_message_new_method_return(call, &m);
438 return synthetic_reply_method_errno(call, r, NULL);
440 r = sd_bus_message_append_strv(m, l);
442 return synthetic_reply_method_errno(call, r, NULL);
444 return synthetic_driver_send(call->bus, m);
447 static int get_creds_by_name(sd_bus *bus, const char *name, uint64_t mask, sd_bus_creds **_creds, sd_bus_error *error) {
448 _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
455 assert_return(service_name_is_valid(name), -EINVAL);
457 r = sd_bus_get_owner(bus, name, mask, &c);
458 if (r == -ESRCH || r == -ENXIO)
459 return sd_bus_error_setf(error, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Name %s is currently not owned by anyone.", name);
463 if ((c->mask & mask) != mask)
472 static int get_creds_by_message(sd_bus *bus, sd_bus_message *m, uint64_t mask, sd_bus_creds **_creds, sd_bus_error *error) {
480 r = sd_bus_message_read(m, "s", &name);
484 return get_creds_by_name(bus, name, mask, _creds, error);
487 static int peer_is_privileged(sd_bus *bus, sd_bus_message *m) {
488 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
492 r = get_creds_by_message(bus, m, SD_BUS_CREDS_UID, &creds, NULL);
496 r = sd_bus_creds_get_uid(creds, &uid);
500 r = sd_bus_creds_has_effective_cap(creds, CAP_SYS_ADMIN);
510 static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) {
520 if (!streq_ptr(sd_bus_message_get_destination(m), "org.freedesktop.DBus"))
523 if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Introspectable", "Introspect")) {
524 if (0 && !isempty(sd_bus_message_get_signature(m, true))) {
525 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
527 r = sd_bus_error_setf(&error, SD_BUS_ERROR_INVALID_ARGS, "Expected no parameters");
529 return synthetic_reply_method_errno(m, r, &error);
532 return synthetic_reply_method_return(m, "s",
533 "<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\" "
534 "\"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
536 " <interface name=\"org.freedesktop.DBus.Introspectable\">\n"
537 " <method name=\"Introspect\">\n"
538 " <arg name=\"data\" type=\"s\" direction=\"out\"/>\n"
541 " <interface name=\"org.freedesktop.DBus\">\n"
542 " <method name=\"AddMatch\">\n"
543 " <arg type=\"s\" direction=\"in\"/>\n"
545 " <method name=\"RemoveMatch\">\n"
546 " <arg type=\"s\" direction=\"in\"/>\n"
548 " <method name=\"GetConnectionSELinuxSecurityContext\">\n"
549 " <arg type=\"s\" direction=\"in\"/>\n"
550 " <arg type=\"ay\" direction=\"out\"/>\n"
552 " <method name=\"GetConnectionUnixProcessID\">\n"
553 " <arg type=\"s\" direction=\"in\"/>\n"
554 " <arg type=\"u\" direction=\"out\"/>\n"
556 " <method name=\"GetConnectionUnixUser\">\n"
557 " <arg type=\"s\" direction=\"in\"/>\n"
558 " <arg type=\"u\" direction=\"out\"/>\n"
560 " <method name=\"GetId\">\n"
561 " <arg type=\"s\" direction=\"out\"/>\n"
563 " <method name=\"GetNameOwner\">\n"
564 " <arg type=\"s\" direction=\"in\"/>\n"
565 " <arg type=\"s\" direction=\"out\"/>\n"
567 " <method name=\"Hello\">\n"
568 " <arg type=\"s\" direction=\"out\"/>\n"
570 " <method name=\"ListActivatableNames\">\n"
571 " <arg type=\"as\" direction=\"out\"/>\n"
573 " <method name=\"ListNames\">\n"
574 " <arg type=\"as\" direction=\"out\"/>\n"
576 " <method name=\"ListQueuedOwners\">\n"
577 " <arg type=\"s\" direction=\"in\"/>\n"
578 " <arg type=\"as\" direction=\"out\"/>\n"
580 " <method name=\"NameHasOwner\">\n"
581 " <arg type=\"s\" direction=\"in\"/>\n"
582 " <arg type=\"b\" direction=\"out\"/>\n"
584 " <method name=\"ReleaseName\">\n"
585 " <arg type=\"s\" direction=\"in\"/>\n"
586 " <arg type=\"u\" direction=\"out\"/>\n"
588 " <method name=\"ReloadConfig\">\n"
590 " <method name=\"RequestName\">\n"
591 " <arg type=\"s\" direction=\"in\"/>\n"
592 " <arg type=\"u\" direction=\"in\"/>\n"
593 " <arg type=\"u\" direction=\"out\"/>\n"
595 " <method name=\"StartServiceByName\">\n"
596 " <arg type=\"s\" direction=\"in\"/>\n"
597 " <arg type=\"u\" direction=\"in\"/>\n"
598 " <arg type=\"u\" direction=\"out\"/>\n"
600 " <method name=\"UpdateActivationEnvironment\">\n"
601 " <arg type=\"a{ss}\" direction=\"in\"/>\n"
603 " <signal name=\"NameAcquired\">\n"
604 " <arg type=\"s\"/>\n"
606 " <signal name=\"NameLost\">\n"
607 " <arg type=\"s\"/>\n"
609 " <signal name=\"NameOwnerChanged\">\n"
610 " <arg type=\"s\"/>\n"
611 " <arg type=\"s\"/>\n"
612 " <arg type=\"s\"/>\n"
617 } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "AddMatch")) {
620 r = sd_bus_message_read(m, "s", &match);
622 return synthetic_reply_method_errno(m, r, NULL);
624 r = sd_bus_add_match(a, NULL, match, NULL, NULL);
626 return synthetic_reply_method_errno(m, r, NULL);
628 return synthetic_reply_method_return(m, NULL);
630 } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "RemoveMatch")) {
633 r = sd_bus_message_read(m, "s", &match);
635 return synthetic_reply_method_errno(m, r, NULL);
637 r = bus_remove_match_by_string(a, match, NULL, NULL);
639 return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_MATCH_RULE_NOT_FOUND, "Match rule not found"));
641 return synthetic_reply_method_errno(m, r, NULL);
643 return synthetic_reply_method_return(m, NULL);
645 } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionSELinuxSecurityContext")) {
646 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
648 r = get_creds_by_message(a, m, SD_BUS_CREDS_SELINUX_CONTEXT, &creds, NULL);
650 return synthetic_reply_method_errno(m, r, NULL);
652 return synthetic_reply_method_return(m, "y", creds->label, strlen(creds->label));
654 } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionUnixProcessID")) {
655 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
657 r = get_creds_by_message(a, m, SD_BUS_CREDS_PID, &creds, NULL);
659 return synthetic_reply_method_errno(m, r, NULL);
661 return synthetic_reply_method_return(m, "u", (uint32_t) creds->pid);
663 } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionUnixUser")) {
664 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
666 r = get_creds_by_message(a, m, SD_BUS_CREDS_UID, &creds, NULL);
668 return synthetic_reply_method_errno(m, r, NULL);
670 return synthetic_reply_method_return(m, "u", (uint32_t) creds->uid);
672 } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetId")) {
673 sd_id128_t server_id;
674 char buf[SD_ID128_STRING_MAX];
676 r = sd_bus_get_server_id(a, &server_id);
678 return synthetic_reply_method_errno(m, r, NULL);
680 return synthetic_reply_method_return(m, "s", sd_id128_to_string(server_id, buf));
682 } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetNameOwner")) {
684 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
685 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
687 r = sd_bus_message_read(m, "s", &name);
689 return synthetic_reply_method_errno(m, r, NULL);
691 if (streq(name, "org.freedesktop.DBus"))
692 return synthetic_reply_method_return(m, "s", "org.freedesktop.DBus");
694 r = get_creds_by_name(a, name, SD_BUS_CREDS_UNIQUE_NAME, &creds, &error);
696 return synthetic_reply_method_errno(m, r, &error);
698 return synthetic_reply_method_return(m, "s", creds->unique_name);
700 /* "Hello" is handled in process_hello() */
702 } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListActivatableNames")) {
703 _cleanup_strv_free_ char **names = NULL;
705 r = sd_bus_list_names(a, NULL, &names);
707 return synthetic_reply_method_errno(m, r, NULL);
709 /* Let's sort the names list to make it stable */
712 return synthetic_reply_return_strv(m, names);
714 } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListNames")) {
715 _cleanup_strv_free_ char **names = NULL;
717 r = sd_bus_list_names(a, &names, NULL);
719 return synthetic_reply_method_errno(m, r, NULL);
721 r = strv_extend(&names, "org.freedesktop.DBus");
723 return synthetic_reply_method_errno(m, r, NULL);
725 /* Let's sort the names list to make it stable */
728 return synthetic_reply_return_strv(m, names);
730 } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListQueuedOwners")) {
731 struct kdbus_cmd_name_list cmd = {};
732 struct kdbus_name_list *name_list;
733 struct kdbus_cmd_free cmd_free;
734 struct kdbus_cmd_name *name;
735 _cleanup_strv_free_ char **owners = NULL;
736 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
740 r = sd_bus_message_read(m, "s", &arg0);
742 return synthetic_reply_method_errno(m, r, NULL);
744 if (!service_name_is_valid(arg0))
745 return synthetic_reply_method_errno(m, -EINVAL, NULL);
747 r = sd_bus_get_owner(a, arg0, 0, NULL);
748 if (r == -ESRCH || r == -ENXIO) {
749 sd_bus_error_setf(&error, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Could not get owners of name '%s': no such name.", arg0);
750 return synthetic_reply_method_errno(m, r, &error);
753 return synthetic_reply_method_errno(m, r, NULL);
755 cmd.flags = KDBUS_NAME_LIST_QUEUED;
756 r = ioctl(a->input_fd, KDBUS_CMD_NAME_LIST, &cmd);
758 return synthetic_reply_method_errno(m, -errno, NULL);
760 name_list = (struct kdbus_name_list *) ((uint8_t *) a->kdbus_buffer + cmd.offset);
762 KDBUS_ITEM_FOREACH(name, name_list, names) {
763 const char *entry_name = NULL;
764 struct kdbus_item *item;
767 KDBUS_ITEM_FOREACH(item, name, items)
768 if (item->type == KDBUS_ITEM_NAME)
769 entry_name = item->str;
771 if (!streq_ptr(entry_name, arg0))
774 if (asprintf(&n, ":1.%llu", (unsigned long long) name->owner_id) < 0) {
779 r = strv_consume(&owners, n);
787 cmd_free.offset = cmd.offset;
789 r = ioctl(a->input_fd, KDBUS_CMD_FREE, &cmd_free);
791 return synthetic_reply_method_errno(m, r, NULL);
794 return synthetic_reply_method_errno(m, err, NULL);
796 return synthetic_reply_return_strv(m, owners);
798 } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "NameHasOwner")) {
801 r = sd_bus_message_read(m, "s", &name);
803 return synthetic_reply_method_errno(m, r, NULL);
805 if (!service_name_is_valid(name))
806 return synthetic_reply_method_errno(m, -EINVAL, NULL);
808 if (streq(name, "org.freedesktop.DBus"))
809 return synthetic_reply_method_return(m, "b", true);
811 r = sd_bus_get_owner(a, name, 0, NULL);
812 if (r < 0 && r != -ESRCH && r != -ENXIO)
813 return synthetic_reply_method_errno(m, r, NULL);
815 return synthetic_reply_method_return(m, "b", r >= 0);
817 } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ReleaseName")) {
820 r = sd_bus_message_read(m, "s", &name);
822 return synthetic_reply_method_errno(m, r, NULL);
824 if (!service_name_is_valid(name))
825 return synthetic_reply_method_errno(m, -EINVAL, NULL);
827 r = sd_bus_release_name(a, name);
830 return synthetic_reply_method_return(m, "u", BUS_NAME_NON_EXISTENT);
831 if (r == -EADDRINUSE)
832 return synthetic_reply_method_return(m, "u", BUS_NAME_NOT_OWNER);
834 return synthetic_reply_method_errno(m, r, NULL);
837 return synthetic_reply_method_return(m, "u", BUS_NAME_RELEASED);
839 } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ReloadConfig")) {
840 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
842 r = sd_bus_error_setf(&error, SD_BUS_ERROR_NOT_SUPPORTED, "%s() is not supported", sd_bus_message_get_member(m));
844 return synthetic_reply_method_errno(m, r, &error);
846 } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "RequestName")) {
850 r = sd_bus_message_read(m, "su", &name, &flags);
852 return synthetic_reply_method_errno(m, r, NULL);
854 if (!service_name_is_valid(name))
855 return synthetic_reply_method_errno(m, -EINVAL, NULL);
856 if ((flags & ~(BUS_NAME_ALLOW_REPLACEMENT|BUS_NAME_REPLACE_EXISTING|BUS_NAME_DO_NOT_QUEUE)) != 0)
857 return synthetic_reply_method_errno(m, -EINVAL, NULL);
859 r = sd_bus_request_name(a, name, flags);
862 return synthetic_reply_method_return(m, "u", BUS_NAME_EXISTS);
864 return synthetic_reply_method_return(m, "u", BUS_NAME_ALREADY_OWNER);
865 return synthetic_reply_method_errno(m, r, NULL);
869 return synthetic_reply_method_return(m, "u", BUS_NAME_IN_QUEUE);
871 return synthetic_reply_method_return(m, "u", BUS_NAME_PRIMARY_OWNER);
873 } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "StartServiceByName")) {
874 _cleanup_bus_message_unref_ sd_bus_message *msg = NULL;
878 r = sd_bus_message_read(m, "su", &name, &flags);
880 return synthetic_reply_method_errno(m, r, NULL);
882 if (!service_name_is_valid(name))
883 return synthetic_reply_method_errno(m, -EINVAL, NULL);
885 return synthetic_reply_method_errno(m, -EINVAL, NULL);
887 r = sd_bus_get_owner(a, name, 0, NULL);
888 if (r >= 0 || streq(name, "org.freedesktop.DBus"))
889 return synthetic_reply_method_return(m, "u", BUS_START_REPLY_ALREADY_RUNNING);
891 return synthetic_reply_method_errno(m, r, NULL);
893 r = sd_bus_message_new_method_call(
898 "org.freedesktop.DBus.Peer",
901 return synthetic_reply_method_errno(m, r, NULL);
903 r = sd_bus_send(a, msg, NULL);
905 return synthetic_reply_method_errno(m, r, NULL);
907 return synthetic_reply_method_return(m, "u", BUS_START_REPLY_SUCCESS);
909 } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "UpdateActivationEnvironment")) {
910 _cleanup_bus_message_unref_ sd_bus_message *msg = NULL;
911 _cleanup_strv_free_ char **args = NULL;
913 if (!peer_is_privileged(a, m))
914 return synthetic_reply_method_errno(m, -EPERM, NULL);
916 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{ss}");
918 return synthetic_reply_method_errno(m, r, NULL);
920 while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "ss")) > 0) {
921 _cleanup_free_ char *s = NULL;
925 r = sd_bus_message_read(m, "ss", &key, &value);
927 return synthetic_reply_method_errno(m, r, NULL);
929 s = strjoin(key, "=", value, NULL);
931 return synthetic_reply_method_errno(m, -ENOMEM, NULL);
933 r = strv_extend(&args, s);
935 return synthetic_reply_method_errno(m, r, NULL);
937 r = sd_bus_message_exit_container(m);
939 return synthetic_reply_method_errno(m, r, NULL);
942 r = sd_bus_message_exit_container(m);
944 return synthetic_reply_method_errno(m, r, NULL);
947 return synthetic_reply_method_errno(m, -EINVAL, NULL);
949 r = sd_bus_message_new_method_call(
952 "org.freedesktop.systemd1",
953 "/org/freedesktop/systemd1",
954 "org.freedesktop.systemd1.Manager",
957 return synthetic_reply_method_errno(m, r, NULL);
959 r = sd_bus_message_append_strv(msg, args);
961 return synthetic_reply_method_errno(m, r, NULL);
963 r = sd_bus_call(a, msg, 0, NULL, NULL);
965 return synthetic_reply_method_errno(m, r, NULL);
967 return synthetic_reply_method_return(m, NULL);
970 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
972 r = sd_bus_error_setf(&error, SD_BUS_ERROR_UNKNOWN_METHOD, "Unknown method '%s'.", m->member);
974 return synthetic_reply_method_errno(m, r, &error);
978 static int process_hello(sd_bus *a, sd_bus *b, sd_bus_message *m, bool *got_hello) {
979 _cleanup_bus_message_unref_ sd_bus_message *n = NULL;
988 /* As reaction to hello we need to respond with two messages:
989 * the callback reply and the NameAcquired for the unique
990 * name, since hello is otherwise obsolete on kdbus. */
993 sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "Hello") &&
994 streq_ptr(m->destination, "org.freedesktop.DBus");
1001 log_error("First packet isn't hello (it's %s.%s), aborting.", m->interface, m->member);
1006 log_error("Got duplicate hello, aborting.");
1015 r = sd_bus_message_new_method_return(m, &n);
1017 log_error("Failed to generate HELLO reply: %s", strerror(-r));
1021 r = sd_bus_message_append(n, "s", a->unique_name);
1023 log_error("Failed to append unique name to HELLO reply: %s", strerror(-r));
1027 r = bus_message_append_sender(n, "org.freedesktop.DBus");
1029 log_error("Failed to append sender to HELLO reply: %s", strerror(-r));
1033 r = bus_seal_synthetic_message(b, n);
1035 log_error("Failed to seal HELLO reply: %s", strerror(-r));
1039 r = sd_bus_send(b, n, NULL);
1041 log_error("Failed to send HELLO reply: %s", strerror(-r));
1045 n = sd_bus_message_unref(n);
1046 r = sd_bus_message_new_signal(
1049 "/org/freedesktop/DBus",
1050 "org.freedesktop.DBus",
1053 log_error("Failed to allocate initial NameAcquired message: %s", strerror(-r));
1057 r = sd_bus_message_append(n, "s", a->unique_name);
1059 log_error("Failed to append unique name to NameAcquired message: %s", strerror(-r));
1063 r = bus_message_append_sender(n, "org.freedesktop.DBus");
1065 log_error("Failed to append sender to NameAcquired message: %s", strerror(-r));
1069 r = bus_seal_synthetic_message(b, n);
1071 log_error("Failed to seal NameAcquired message: %s", strerror(-r));
1075 r = sd_bus_send(b, n, NULL);
1077 log_error("Failed to send NameAcquired message: %s", strerror(-r));
1084 static int patch_sender(sd_bus *a, sd_bus_message *m) {
1085 char **well_known = NULL;
1095 /* We will change the sender of messages from the bus driver
1096 * so that they originate from the bus driver. This is a
1097 * speciality originating from dbus1, where the bus driver did
1098 * not have a unique id, but only the well-known name. */
1100 c = sd_bus_message_get_creds(m);
1104 r = sd_bus_creds_get_well_known_names(c, &well_known);
1108 if (strv_contains(well_known, "org.freedesktop.DBus"))
1109 m->sender = "org.freedesktop.DBus";
1114 int main(int argc, char *argv[]) {
1116 _cleanup_bus_close_unref_ sd_bus *a = NULL, *b = NULL;
1117 sd_id128_t server_id;
1118 int r, in_fd, out_fd;
1119 bool got_hello = false;
1121 struct ucred ucred = {};
1122 _cleanup_free_ char *peersec = NULL;
1125 log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
1126 log_parse_environment();
1129 r = parse_argv(argc, argv);
1133 r = policy_load(&policy, arg_configuration);
1135 log_error("Failed to load policy: %s", strerror(-r));
1139 /* policy_dump(&policy); */
1141 r = sd_listen_fds(0);
1143 in_fd = STDIN_FILENO;
1144 out_fd = STDOUT_FILENO;
1145 } else if (r == 1) {
1146 in_fd = SD_LISTEN_FDS_START;
1147 out_fd = SD_LISTEN_FDS_START;
1149 log_error("Illegal number of file descriptors passed");
1154 sd_is_socket(in_fd, AF_UNIX, 0, 0) > 0 &&
1155 sd_is_socket(out_fd, AF_UNIX, 0, 0) > 0;
1158 r = getpeercred(in_fd, &ucred);
1160 log_error("Failed to get peer creds: %s", strerror(-r));
1164 (void) getpeersec(in_fd, &peersec);
1167 if (arg_drop_privileges) {
1168 const char *user = "systemd-bus-proxy";
1172 r = get_user_creds(&user, &uid, &gid, NULL, NULL);
1174 log_error("Cannot resolve user name %s: %s", user, strerror(-r));
1178 r = drop_privileges(uid, gid, 1ULL << CAP_IPC_OWNER);
1185 log_error("Failed to allocate bus: %s", strerror(-r));
1189 r = sd_bus_set_name(a, "sd-proxy");
1191 log_error("Failed to set bus name: %s", strerror(-r));
1195 r = sd_bus_set_address(a, arg_address);
1197 log_error("Failed to set address to connect to: %s", strerror(-r));
1201 r = sd_bus_negotiate_fds(a, is_unix);
1203 log_error("Failed to set FD negotiation: %s", strerror(-r));
1207 if (ucred.pid > 0) {
1208 a->fake_creds.pid = ucred.pid;
1209 a->fake_creds.uid = ucred.uid;
1210 a->fake_creds.gid = ucred.gid;
1211 a->fake_creds_valid = true;
1215 a->fake_label = peersec;
1219 a->manual_peer_interface = true;
1221 r = sd_bus_start(a);
1223 log_error("Failed to start bus client: %s", strerror(-r));
1227 r = sd_bus_get_server_id(a, &server_id);
1229 log_error("Failed to get server ID: %s", strerror(-r));
1235 log_error("Failed to allocate bus: %s", strerror(-r));
1239 r = sd_bus_set_fd(b, in_fd, out_fd);
1241 log_error("Failed to set fds: %s", strerror(-r));
1245 r = sd_bus_set_server(b, 1, server_id);
1247 log_error("Failed to set server mode: %s", strerror(-r));
1251 r = sd_bus_negotiate_fds(b, is_unix);
1253 log_error("Failed to set FD negotiation: %s", strerror(-r));
1257 r = sd_bus_set_anonymous(b, true);
1259 log_error("Failed to set anonymous authentication: %s", strerror(-r));
1263 b->manual_peer_interface = true;
1265 r = sd_bus_start(b);
1267 log_error("Failed to start bus client: %s", strerror(-r));
1271 r = rename_service(a, b);
1273 log_debug("Failed to rename process: %s", strerror(-r));
1276 _cleanup_free_ char *match = NULL;
1279 r = sd_bus_get_unique_name(a, &unique);
1281 log_error("Failed to get unique name: %s", strerror(-r));
1285 match = strjoin("type='signal',"
1286 "sender='org.freedesktop.DBus',"
1287 "path='/org/freedesktop/DBus',"
1288 "interface='org.freedesktop.DBus',"
1289 "member='NameOwnerChanged',"
1299 r = sd_bus_add_match(a, NULL, match, NULL, NULL);
1301 log_error("Failed to add match for NameLost: %s", strerror(-r));
1306 match = strjoin("type='signal',"
1307 "sender='org.freedesktop.DBus',"
1308 "path='/org/freedesktop/DBus',"
1309 "interface='org.freedesktop.DBus',"
1310 "member='NameOwnerChanged',"
1320 r = sd_bus_add_match(a, NULL, match, NULL, NULL);
1322 log_error("Failed to add match for NameAcquired: %s", strerror(-r));
1328 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1329 int events_a, events_b, fd;
1330 uint64_t timeout_a, timeout_b, t;
1331 struct timespec _ts, *ts;
1332 struct pollfd *pollfd;
1336 r = sd_bus_process(a, &m);
1338 /* treat 'connection reset by peer' as clean exit condition */
1339 if (r == -ECONNRESET)
1342 log_error("Failed to process bus a: %s", strerror(-r));
1348 /* We officially got EOF, let's quit */
1349 if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected")) {
1354 k = synthesize_name_acquired(a, b, m);
1357 log_error("Failed to synthesize message: %s", strerror(-r));
1363 k = sd_bus_send(b, m, NULL);
1365 if (k == -ECONNRESET)
1369 log_error("Failed to send message: %s", strerror(-r));
1380 r = sd_bus_process(b, &m);
1382 /* treat 'connection reset by peer' as clean exit condition */
1383 if (r == -ECONNRESET)
1386 log_error("Failed to process bus b: %s", strerror(-r));
1392 /* We officially got EOF, let's quit */
1393 if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected")) {
1398 k = process_hello(a, b, m, &got_hello);
1401 log_error("Failed to process HELLO: %s", strerror(-r));
1408 k = process_policy(a, b, m);
1411 log_error("Failed to process policy: %s", strerror(-r));
1415 k = process_driver(a, b, m);
1418 log_error("Failed to process driver calls: %s", strerror(-r));
1425 k = sd_bus_send(a, m, NULL);
1427 if (k == -ECONNRESET)
1431 log_error("Failed to send message: %s", strerror(-r));
1443 fd = sd_bus_get_fd(a);
1445 log_error("Failed to get fd: %s", strerror(-r));
1449 events_a = sd_bus_get_events(a);
1451 log_error("Failed to get events mask: %s", strerror(-r));
1455 r = sd_bus_get_timeout(a, &timeout_a);
1457 log_error("Failed to get timeout: %s", strerror(-r));
1461 events_b = sd_bus_get_events(b);
1463 log_error("Failed to get events mask: %s", strerror(-r));
1467 r = sd_bus_get_timeout(b, &timeout_b);
1469 log_error("Failed to get timeout: %s", strerror(-r));
1474 if (t == (uint64_t) -1 || (timeout_b != (uint64_t) -1 && timeout_b < timeout_a))
1477 if (t == (uint64_t) -1)
1482 nw = now(CLOCK_MONOTONIC);
1488 ts = timespec_store(&_ts, t);
1491 pollfd = (struct pollfd[3]) {
1492 {.fd = fd, .events = events_a, },
1493 {.fd = in_fd, .events = events_b & POLLIN, },
1494 {.fd = out_fd, .events = events_b & POLLOUT, }
1497 r = ppoll(pollfd, 3, ts, NULL);
1499 log_error("ppoll() failed: %m");
1507 "STATUS=Shutting down.");
1509 policy_free(&policy);
1510 strv_free(arg_configuration);
1513 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;