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
9 Copyright 2015 David Herrmann
11 systemd is free software; you can redistribute it and/or modify it
12 under the terms of the GNU Lesser General Public License as published by
13 the Free Software Foundation; either version 2.1 of the License, or
14 (at your option) any later version.
16 systemd is distributed in the hope that it will be useful, but
17 WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 Lesser General Public License for more details.
21 You should have received a copy of the GNU Lesser General Public License
22 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/socket.h>
27 #include <sys/types.h>
33 #include <sys/prctl.h>
41 #include "socket-util.h"
42 #include "sd-daemon.h"
44 #include "bus-internal.h"
45 #include "bus-message.h"
50 #include "capability.h"
51 #include "bus-control.h"
52 #include "smack-util.h"
54 #include "bus-xml-policy.h"
57 #include "synthesize.h"
59 static char *arg_address = NULL;
60 static char **arg_configuration = NULL;
67 static ClientContext *client_context_free(ClientContext *c) {
77 DEFINE_TRIVIAL_CLEANUP_FUNC(ClientContext*, client_context_free);
79 static int client_context_new(ClientContext **out) {
80 _cleanup_(client_context_freep) ClientContext *c = NULL;
82 c = new0(ClientContext, 1);
93 static void *run_client(void *userdata) {
94 _cleanup_(client_context_freep) ClientContext *c = userdata;
95 _cleanup_(proxy_freep) Proxy *p = NULL;
99 r = proxy_new(&p, c->fd, c->fd, arg_address);
103 /* set comm to "p$PIDu$UID" and suffix with '*' if truncated */
104 r = snprintf(comm, sizeof(comm), "p" PID_FMT "u" UID_FMT, p->local_creds.pid, p->local_creds.uid);
105 if (r >= (ssize_t)sizeof(comm))
106 comm[sizeof(comm) - 2] = '*';
107 (void) prctl(PR_SET_NAME, comm);
109 r = proxy_set_policy(p, c->policy, arg_configuration);
113 r = proxy_hello_policy(p, getuid());
123 static int loop_clients(int accept_fd) {
124 _cleanup_(shared_policy_freep) SharedPolicy *sp = NULL;
128 r = pthread_attr_init(&attr);
130 r = log_error_errno(errno, "Cannot initialize pthread attributes: %m");
134 r = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
136 r = log_error_errno(errno, "Cannot mark pthread attributes as detached: %m");
140 r = shared_policy_new(&sp);
149 fd = accept4(accept_fd, NULL, NULL, SOCK_NONBLOCK | SOCK_CLOEXEC);
151 if (errno == EAGAIN || errno == EINTR)
154 r = log_error_errno(errno, "accept4() failed: %m");
158 r = client_context_new(&c);
168 r = pthread_create(&tid, &attr, run_client, c);
170 log_error("Cannot spawn thread: %m");
171 client_context_free(c);
177 pthread_attr_destroy(&attr);
182 static int help(void) {
184 printf("%s [OPTIONS...]\n\n"
185 "DBus proxy server.\n\n"
186 " -h --help Show this help\n"
187 " --version Show package version\n"
188 " --configuration=PATH Configuration file or directory\n"
189 " --machine=MACHINE Connect to specified machine\n"
190 " --address=ADDRESS Connect to the bus specified by ADDRESS\n"
191 " (default: " DEFAULT_SYSTEM_BUS_ADDRESS ")\n",
192 program_invocation_short_name);
197 static int parse_argv(int argc, char *argv[]) {
206 static const struct option options[] = {
207 { "help", no_argument, NULL, 'h' },
208 { "version", no_argument, NULL, ARG_VERSION },
209 { "address", required_argument, NULL, ARG_ADDRESS },
210 { "configuration", required_argument, NULL, ARG_CONFIGURATION },
211 { "machine", required_argument, NULL, ARG_MACHINE },
220 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
229 puts(PACKAGE_STRING);
230 puts(SYSTEMD_FEATURES);
245 case ARG_CONFIGURATION:
246 r = strv_extend(&arg_configuration, optarg);
252 _cleanup_free_ char *e = NULL;
255 e = bus_address_escape(optarg);
260 a = strjoin("x-machine-kernel:machine=", e, ";x-machine-unix:machine=", e, NULL);
262 a = strjoin("x-machine-unix:machine=", e, NULL);
277 assert_not_reached("Unhandled option");
281 log_error("Too many arguments");
286 arg_address = strdup(DEFAULT_SYSTEM_BUS_ADDRESS);
294 int main(int argc, char *argv[]) {
295 const char *user = "systemd-bus-proxy";
300 log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
301 log_parse_environment();
304 if (geteuid() == 0) {
305 r = get_user_creds(&user, &uid, &gid, NULL, NULL);
307 log_error_errno(r, "Cannot resolve user name %s: %m", user);
311 r = drop_privileges(uid, gid, 1ULL << CAP_IPC_OWNER);
313 log_error_errno(r, "Cannot drop privileges: %m");
318 r = parse_argv(argc, argv);
322 r = sd_listen_fds(0);
324 log_error("Illegal number of file descriptors passed");
328 accept_fd = SD_LISTEN_FDS_START;
329 r = fd_nonblock(accept_fd, false);
331 log_error_errno(r, "Cannot mark accept-fd non-blocking: %m");
335 r = loop_clients(accept_fd);
340 "STATUS=Shutting down.");
342 strv_free(arg_configuration);
345 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;