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"
44 const char *arg_bus_path = "kernel:path=/dev/kdbus/0-system/bus;unix:path=/run/dbus/system_bus_socket";
46 const char *arg_bus_path = "unix:path=/run/dbus/system_bus_socket";
49 static int help(void) {
51 printf("%s [OPTIONS...]\n\n"
52 "Connection STDIO or a socket to a given bus address.\n\n"
53 " -h --help Show this help\n"
54 " --version Show package version\n"
55 " -p --bus-path=PATH Bus address to forward to (default: %s)\n",
56 program_invocation_short_name, arg_bus_path);
61 static int parse_argv(int argc, char *argv[]) {
67 static const struct option options[] = {
68 { "help", no_argument, NULL, 'h' },
69 { "bus-path", required_argument, NULL, 'p' },
78 while ((c = getopt_long(argc, argv, "hsup:", options, NULL)) >= 0) {
88 puts(SYSTEMD_FEATURES);
95 arg_bus_path = optarg;
99 log_error("Unknown option code %c", c);
107 int main(int argc, char *argv[]) {
108 _cleanup_bus_unref_ sd_bus *a = NULL, *b = NULL;
109 sd_id128_t server_id;
111 int r, in_fd, out_fd;
113 log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
114 log_parse_environment();
117 r = parse_argv(argc, argv);
121 r = sd_listen_fds(0);
123 in_fd = STDIN_FILENO;
124 out_fd = STDOUT_FILENO;
126 in_fd = SD_LISTEN_FDS_START;
127 out_fd = SD_LISTEN_FDS_START;
129 log_error("Illegal number of file descriptors passed\n");
134 sd_is_socket(in_fd, AF_UNIX, 0, 0) > 0 &&
135 sd_is_socket(out_fd, AF_UNIX, 0, 0) > 0;
139 log_error("Failed to allocate bus: %s", strerror(-r));
143 r = sd_bus_set_address(a, arg_bus_path);
145 log_error("Failed to set address to connect to: %s", strerror(-r));
149 r = sd_bus_negotiate_fds(a, is_unix);
151 log_error("Failed to set FD negotiation: %s", strerror(-r));
157 log_error("Failed to start bus client: %s", strerror(-r));
161 r = sd_bus_get_server_id(a, &server_id);
163 log_error("Failed to get server ID: %s", strerror(-r));
169 log_error("Failed to allocate bus: %s", strerror(-r));
173 r = sd_bus_set_fd(b, in_fd, out_fd);
175 log_error("Failed to set fds: %s", strerror(-r));
179 r = sd_bus_set_server(b, 1, server_id);
181 log_error("Failed to set server mode: %s", strerror(-r));
185 r = sd_bus_negotiate_fds(b, is_unix);
187 log_error("Failed to set FD negotiation: %s", strerror(-r));
191 r = sd_bus_set_anonymous(b, true);
193 log_error("Failed to set anonymous authentication: %s", strerror(-r));
199 log_error("Failed to start bus client: %s", strerror(-r));
204 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
205 int events_a, events_b, fd;
206 uint64_t timeout_a, timeout_b, t;
207 struct timespec _ts, *ts;
209 r = sd_bus_process(a, &m);
211 log_error("Failed to process bus a: %s", strerror(-r));
216 r = sd_bus_send(b, m, NULL);
218 log_error("Failed to send message: %s", strerror(-r));
226 r = sd_bus_process(b, &m);
228 /* treat 'connection reset by peer' as clean exit condition */
229 if (r == -ECONNRESET)
236 r = sd_bus_send(a, m, NULL);
238 log_error("Failed to send message: %s", strerror(-r));
246 fd = sd_bus_get_fd(a);
248 log_error("Failed to get fd: %s", strerror(-r));
252 events_a = sd_bus_get_events(a);
254 log_error("Failed to get events mask: %s", strerror(-r));
258 r = sd_bus_get_timeout(a, &timeout_a);
260 log_error("Failed to get timeout: %s", strerror(-r));
264 events_b = sd_bus_get_events(b);
266 log_error("Failed to get events mask: %s", strerror(-r));
270 r = sd_bus_get_timeout(b, &timeout_b);
272 log_error("Failed to get timeout: %s", strerror(-r));
277 if (t == (uint64_t) -1 || (timeout_b != (uint64_t) -1 && timeout_b < timeout_a))
280 if (t == (uint64_t) -1)
285 nw = now(CLOCK_MONOTONIC);
291 ts = timespec_store(&_ts, t);
295 struct pollfd p[3] = {
296 {.fd = fd, .events = events_a, },
297 {.fd = STDIN_FILENO, .events = events_b & POLLIN, },
298 {.fd = STDOUT_FILENO, .events = events_b & POLLOUT, }};
300 r = ppoll(p, ELEMENTSOF(p), ts, NULL);
303 log_error("ppoll() failed: %m");
311 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;