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;
68 static ClientContext *client_context_free(ClientContext *c) {
78 DEFINE_TRIVIAL_CLEANUP_FUNC(ClientContext*, client_context_free);
80 static int client_context_new(ClientContext **out) {
81 _cleanup_(client_context_freep) ClientContext *c = NULL;
83 c = new0(ClientContext, 1);
94 static void *run_client(void *userdata) {
95 _cleanup_(client_context_freep) ClientContext *c = userdata;
96 _cleanup_(proxy_freep) Proxy *p = NULL;
100 r = proxy_new(&p, c->fd, c->fd, arg_address);
104 /* set comm to "p$PIDu$UID" and suffix with '*' if truncated */
105 r = snprintf(comm, sizeof(comm), "p" PID_FMT "u" UID_FMT, p->local_creds.pid, p->local_creds.uid);
106 if (r >= (ssize_t)sizeof(comm))
107 comm[sizeof(comm) - 2] = '*';
108 (void) prctl(PR_SET_NAME, comm);
110 r = proxy_set_policy(p, c->policy, arg_configuration);
114 r = proxy_hello_policy(p, c->bus_uid);
124 static int loop_clients(int accept_fd, uid_t bus_uid) {
125 _cleanup_(shared_policy_freep) SharedPolicy *sp = NULL;
129 r = pthread_attr_init(&attr);
131 r = log_error_errno(errno, "Cannot initialize pthread attributes: %m");
135 r = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
137 r = log_error_errno(errno, "Cannot mark pthread attributes as detached: %m");
141 r = shared_policy_new(&sp);
150 fd = accept4(accept_fd, NULL, NULL, SOCK_NONBLOCK | SOCK_CLOEXEC);
152 if (errno == EAGAIN || errno == EINTR)
155 r = log_error_errno(errno, "accept4() failed: %m");
159 r = client_context_new(&c);
168 c->bus_uid = bus_uid;
170 r = pthread_create(&tid, &attr, run_client, c);
172 log_error("Cannot spawn thread: %m");
173 client_context_free(c);
179 pthread_attr_destroy(&attr);
184 static int help(void) {
186 printf("%s [OPTIONS...]\n\n"
187 "DBus proxy server.\n\n"
188 " -h --help Show this help\n"
189 " --version Show package version\n"
190 " --configuration=PATH Configuration file or directory\n"
191 " --machine=MACHINE Connect to specified machine\n"
192 " --address=ADDRESS Connect to the bus specified by ADDRESS\n"
193 " (default: " DEFAULT_SYSTEM_BUS_ADDRESS ")\n",
194 program_invocation_short_name);
199 static int parse_argv(int argc, char *argv[]) {
208 static const struct option options[] = {
209 { "help", no_argument, NULL, 'h' },
210 { "version", no_argument, NULL, ARG_VERSION },
211 { "address", required_argument, NULL, ARG_ADDRESS },
212 { "configuration", required_argument, NULL, ARG_CONFIGURATION },
213 { "machine", required_argument, NULL, ARG_MACHINE },
222 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
231 puts(PACKAGE_STRING);
232 puts(SYSTEMD_FEATURES);
247 case ARG_CONFIGURATION:
248 r = strv_extend(&arg_configuration, optarg);
254 _cleanup_free_ char *e = NULL;
257 e = bus_address_escape(optarg);
262 a = strjoin("x-machine-kernel:machine=", e, ";x-machine-unix:machine=", e, NULL);
264 a = strjoin("x-machine-unix:machine=", e, NULL);
279 assert_not_reached("Unhandled option");
283 log_error("Too many arguments");
288 arg_address = strdup(DEFAULT_SYSTEM_BUS_ADDRESS);
296 int main(int argc, char *argv[]) {
297 const char *user = "systemd-bus-proxy";
302 log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
303 log_parse_environment();
308 if (geteuid() == 0) {
309 r = get_user_creds(&user, &uid, &gid, NULL, NULL);
311 log_error_errno(r, "Cannot resolve user name %s: %m", user);
315 r = drop_privileges(uid, gid, 1ULL << CAP_IPC_OWNER);
317 log_error_errno(r, "Cannot drop privileges: %m");
322 r = parse_argv(argc, argv);
326 r = sd_listen_fds(0);
328 log_error("Illegal number of file descriptors passed");
332 accept_fd = SD_LISTEN_FDS_START;
333 r = fd_nonblock(accept_fd, false);
335 log_error_errno(r, "Cannot mark accept-fd non-blocking: %m");
339 r = loop_clients(accept_fd, bus_uid);
344 "STATUS=Shutting down.");
346 strv_free(arg_configuration);
349 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;