1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include <sys/socket.h>
24 #include <sys/types.h>
35 #include "socket-util.h"
36 #include "sd-daemon.h"
38 #include "bus-internal.h"
39 #include "bus-message.h"
45 static const char *arg_address = DEFAULT_SYSTEM_BUS_PATH;
46 static char *arg_command_line_buffer = NULL;
48 static int help(void) {
50 printf("%s [OPTIONS...]\n\n"
51 "Connect STDIO or a socket to a given bus address.\n\n"
52 " -h --help Show this help\n"
53 " --version Show package version\n"
54 " --address=ADDRESS Connect to the bus specified by ADDRESS\n"
55 " (default: " DEFAULT_SYSTEM_BUS_PATH ")\n",
56 program_invocation_short_name);
61 static int parse_argv(int argc, char *argv[]) {
68 static const struct option options[] = {
69 { "help", no_argument, NULL, 'h' },
70 { "version", no_argument, NULL, ARG_VERSION },
71 { "address", required_argument, NULL, ARG_ADDRESS },
80 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
90 puts(SYSTEMD_FEATURES);
101 assert_not_reached("Unhandled option");
105 /* If the first command line argument is only "x" characters
106 * we'll write who we are talking to into it, so that "ps" is
108 arg_command_line_buffer = argv[optind];
109 if (argc > optind + 1 ||
110 (arg_command_line_buffer && arg_command_line_buffer[strspn(arg_command_line_buffer, "x")] != 0)) {
111 log_error("Too many arguments");
118 static int rename_service(sd_bus *a, sd_bus *b) {
119 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
120 _cleanup_free_ char *p = NULL, *name = NULL;
130 r = sd_bus_get_peer_creds(b, SD_BUS_CREDS_UID|SD_BUS_CREDS_PID|SD_BUS_CREDS_CMDLINE|SD_BUS_CREDS_COMM, &creds);
134 r = sd_bus_creds_get_uid(creds, &uid);
138 r = sd_bus_creds_get_pid(creds, &pid);
142 r = sd_bus_creds_get_cmdline(creds, &cmdline);
146 r = sd_bus_creds_get_comm(creds, &comm);
150 name = uid_to_name(uid);
154 p = strv_join(cmdline, " ");
158 /* The status string gets the full command line ... */
160 "STATUS=Processing requests from client PID "PID_FMT" (%s); UID "UID_FMT" (%s)",
164 /* ... and the argv line only the short comm */
165 if (arg_command_line_buffer) {
168 m = strlen(arg_command_line_buffer);
169 w = snprintf(arg_command_line_buffer, m,
170 "[PID "PID_FMT"/%s; UID "UID_FMT"/%s]",
175 memzero(arg_command_line_buffer + w, m - w);
178 log_debug("Running on behalf of PID "PID_FMT" (%s), UID "UID_FMT" (%s), %s",
186 static int synthesize_name_acquired(sd_bus *a, sd_bus *b, sd_bus_message *m) {
187 _cleanup_bus_message_unref_ sd_bus_message *n = NULL;
188 const char *name, *old_owner, *new_owner;
195 /* If we get NameOwnerChanged for our own name, we need to
196 * synthesize NameLost/NameAcquired, since socket clients need
197 * that, even though it is obsoleted on kdbus */
202 if (!sd_bus_message_is_signal(m, "org.freedesktop.DBus", "NameOwnerChanged") ||
203 !streq_ptr(m->path, "/org/freedesktop/DBus") ||
204 !streq_ptr(m->sender, "org.freedesktop.DBus"))
207 r = sd_bus_message_read(m, "sss", &name, &old_owner, &new_owner);
211 r = sd_bus_message_rewind(m, true);
215 if (streq(old_owner, a->unique_name)) {
217 r = sd_bus_message_new_signal(
220 "/org/freedesktop/DBus",
221 "org.freedesktop.DBus",
224 } else if (streq(new_owner, a->unique_name)) {
226 r = sd_bus_message_new_signal(
229 "/org/freedesktop/DBus",
230 "org.freedesktop.DBus",
238 r = sd_bus_message_append(n, "s", name);
242 r = bus_message_append_sender(n, "org.freedesktop.DBus");
246 r = bus_seal_synthetic_message(b, n);
250 return sd_bus_send(b, n, NULL);
253 static int process_policy(sd_bus *a, sd_bus *b, sd_bus_message *m) {
254 _cleanup_bus_message_unref_ sd_bus_message *n = NULL;
261 if (!sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Properties", "GetAll"))
264 if (!streq_ptr(m->path, "/org/gnome/DisplayManager/Slave"))
267 r = sd_bus_message_new_method_errorf(m, &n, SD_BUS_ERROR_ACCESS_DENIED, "gdm, you are stupid");
271 r = bus_message_append_sender(n, "org.freedesktop.DBus");
273 log_error("Failed to append sender to gdm reply: %s", strerror(-r));
277 r = bus_seal_synthetic_message(b, n);
279 log_error("Failed to seal gdm reply: %s", strerror(-r));
283 r = sd_bus_send(b, n, NULL);
285 log_error("Failed to send gdm reply: %s", strerror(-r));
292 static int process_hello(sd_bus *a, sd_bus *b, sd_bus_message *m, bool *got_hello) {
293 _cleanup_bus_message_unref_ sd_bus_message *n = NULL;
302 /* As reaction to hello we need to respond with two messages:
303 * the callback reply and the NameAcquired for the unique
304 * name, since hello is otherwise obsolete on kdbus. */
307 sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "Hello") &&
308 streq_ptr(m->destination, "org.freedesktop.DBus");
315 log_error("First packet isn't hello (it's %s.%s), aborting.", m->interface, m->member);
320 log_error("Got duplicate hello, aborting.");
329 r = sd_bus_message_new_method_return(m, &n);
331 log_error("Failed to generate HELLO reply: %s", strerror(-r));
335 r = sd_bus_message_append(n, "s", a->unique_name);
337 log_error("Failed to append unique name to HELLO reply: %s", strerror(-r));
341 r = bus_message_append_sender(n, "org.freedesktop.DBus");
343 log_error("Failed to append sender to HELLO reply: %s", strerror(-r));
347 r = bus_seal_synthetic_message(b, n);
349 log_error("Failed to seal HELLO reply: %s", strerror(-r));
353 r = sd_bus_send(b, n, NULL);
355 log_error("Failed to send HELLO reply: %s", strerror(-r));
359 n = sd_bus_message_unref(n);
360 r = sd_bus_message_new_signal(
363 "/org/freedesktop/DBus",
364 "org.freedesktop.DBus",
367 log_error("Failed to allocate initial NameAcquired message: %s", strerror(-r));
371 r = sd_bus_message_append(n, "s", a->unique_name);
373 log_error("Failed to append unique name to NameAcquired message: %s", strerror(-r));
377 r = bus_message_append_sender(n, "org.freedesktop.DBus");
379 log_error("Failed to append sender to NameAcquired message: %s", strerror(-r));
383 r = bus_seal_synthetic_message(b, n);
385 log_error("Failed to seal NameAcquired message: %s", strerror(-r));
389 r = sd_bus_send(b, n, NULL);
391 log_error("Failed to send NameAcquired message: %s", strerror(-r));
398 static int patch_sender(sd_bus *a, sd_bus_message *m) {
399 char **well_known = NULL;
409 /* We will change the sender of messages from the bus driver
410 * so that they originate from the bus driver. This is a
411 * speciality originating from dbus1, where the bus driver did
412 * not have a unique id, but only the well-known name. */
414 c = sd_bus_message_get_creds(m);
418 r = sd_bus_creds_get_well_known_names(c, &well_known);
422 if (strv_contains(well_known, "org.freedesktop.DBus"))
423 m->sender = "org.freedesktop.DBus";
428 int main(int argc, char *argv[]) {
430 _cleanup_bus_unref_ sd_bus *a = NULL, *b = NULL;
431 sd_id128_t server_id;
432 int r, in_fd, out_fd;
433 bool got_hello = false;
435 struct ucred ucred = {};
436 _cleanup_free_ char *peersec = NULL;
438 log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
439 log_parse_environment();
442 r = parse_argv(argc, argv);
446 r = sd_listen_fds(0);
448 in_fd = STDIN_FILENO;
449 out_fd = STDOUT_FILENO;
451 in_fd = SD_LISTEN_FDS_START;
452 out_fd = SD_LISTEN_FDS_START;
454 log_error("Illegal number of file descriptors passed");
459 sd_is_socket(in_fd, AF_UNIX, 0, 0) > 0 &&
460 sd_is_socket(out_fd, AF_UNIX, 0, 0) > 0;
463 getpeercred(in_fd, &ucred);
464 getpeersec(in_fd, &peersec);
469 log_error("Failed to allocate bus: %s", strerror(-r));
473 r = sd_bus_set_name(a, "sd-proxy");
475 log_error("Failed to set bus name: %s", strerror(-r));
479 r = sd_bus_set_address(a, arg_address);
481 log_error("Failed to set address to connect to: %s", strerror(-r));
485 r = sd_bus_negotiate_fds(a, is_unix);
487 log_error("Failed to set FD negotiation: %s", strerror(-r));
492 a->fake_creds.pid = ucred.pid;
493 a->fake_creds.uid = ucred.uid;
494 a->fake_creds.gid = ucred.gid;
495 a->fake_creds_valid = true;
499 a->fake_label = peersec;
503 a->manual_peer_interface = true;
507 log_error("Failed to start bus client: %s", strerror(-r));
511 r = sd_bus_get_server_id(a, &server_id);
513 log_error("Failed to get server ID: %s", strerror(-r));
519 log_error("Failed to allocate bus: %s", strerror(-r));
523 r = sd_bus_set_fd(b, in_fd, out_fd);
525 log_error("Failed to set fds: %s", strerror(-r));
529 r = sd_bus_set_server(b, 1, server_id);
531 log_error("Failed to set server mode: %s", strerror(-r));
535 r = sd_bus_negotiate_fds(b, is_unix);
537 log_error("Failed to set FD negotiation: %s", strerror(-r));
541 r = sd_bus_set_anonymous(b, true);
543 log_error("Failed to set anonymous authentication: %s", strerror(-r));
547 b->manual_peer_interface = true;
551 log_error("Failed to start bus client: %s", strerror(-r));
555 r = rename_service(a, b);
557 log_debug("Failed to rename process: %s", strerror(-r));
560 _cleanup_free_ char *match = NULL;
563 r = sd_bus_get_unique_name(a, &unique);
565 log_error("Failed to get unique name: %s", strerror(-r));
569 match = strjoin("type='signal',"
570 "sender='org.freedesktop.DBus',"
571 "path='/org/freedesktop/DBus',"
572 "interface='org.freedesktop.DBus',"
573 "member='NameOwnerChanged',"
583 r = sd_bus_add_match(a, match, NULL, NULL);
585 log_error("Failed to add match for NameLost: %s", strerror(-r));
590 match = strjoin("type='signal',"
591 "sender='org.freedesktop.DBus',"
592 "path='/org/freedesktop/DBus',"
593 "interface='org.freedesktop.DBus',"
594 "member='NameOwnerChanged',"
604 r = sd_bus_add_match(a, match, NULL, NULL);
606 log_error("Failed to add match for NameAcquired: %s", strerror(-r));
612 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
613 int events_a, events_b, fd;
614 uint64_t timeout_a, timeout_b, t;
615 struct timespec _ts, *ts;
616 struct pollfd *pollfd;
620 r = sd_bus_process(a, &m);
622 /* treat 'connection reset by peer' as clean exit condition */
623 if (r == -ECONNRESET)
626 log_error("Failed to process bus a: %s", strerror(-r));
632 /* We officially got EOF, let's quit */
633 if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected")) {
638 k = synthesize_name_acquired(a, b, m);
641 log_error("Failed to synthesize message: %s", strerror(-r));
647 k = sd_bus_send(b, m, NULL);
649 if (k == -ECONNRESET)
653 log_error("Failed to send message: %s", strerror(-r));
664 r = sd_bus_process(b, &m);
666 /* treat 'connection reset by peer' as clean exit condition */
667 if (r == -ECONNRESET)
670 log_error("Failed to process bus b: %s", strerror(-r));
676 /* We officially got EOF, let's quit */
677 if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected")) {
682 k = process_hello(a, b, m, &got_hello);
685 log_error("Failed to process HELLO: %s", strerror(-r));
692 k = process_policy(a, b, m);
695 log_error("Failed to process policy: %s", strerror(-r));
699 k = sd_bus_send(a, m, NULL);
701 if (r == -ECONNRESET)
705 log_error("Failed to send message: %s", strerror(-r));
716 fd = sd_bus_get_fd(a);
718 log_error("Failed to get fd: %s", strerror(-r));
722 events_a = sd_bus_get_events(a);
724 log_error("Failed to get events mask: %s", strerror(-r));
728 r = sd_bus_get_timeout(a, &timeout_a);
730 log_error("Failed to get timeout: %s", strerror(-r));
734 events_b = sd_bus_get_events(b);
736 log_error("Failed to get events mask: %s", strerror(-r));
740 r = sd_bus_get_timeout(b, &timeout_b);
742 log_error("Failed to get timeout: %s", strerror(-r));
747 if (t == (uint64_t) -1 || (timeout_b != (uint64_t) -1 && timeout_b < timeout_a))
750 if (t == (uint64_t) -1)
755 nw = now(CLOCK_MONOTONIC);
761 ts = timespec_store(&_ts, t);
764 pollfd = (struct pollfd[3]) {
765 {.fd = fd, .events = events_a, },
766 {.fd = in_fd, .events = events_b & POLLIN, },
767 {.fd = out_fd, .events = events_b & POLLOUT, }
770 r = ppoll(pollfd, 3, ts, NULL);
772 log_error("ppoll() failed: %m");
781 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;