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);
106 /* set comm to "p$PIDu$UID" and suffix with '*' if truncated */
107 r = snprintf(comm, sizeof(comm), "p" PID_FMT "u" UID_FMT, p->local_creds.pid, p->local_creds.uid);
108 if (r >= (ssize_t)sizeof(comm))
109 comm[sizeof(comm) - 2] = '*';
110 (void) prctl(PR_SET_NAME, comm);
112 r = proxy_set_policy(p, c->policy, arg_configuration);
116 r = proxy_hello_policy(p, c->bus_uid);
126 static int loop_clients(int accept_fd, uid_t bus_uid) {
127 _cleanup_(shared_policy_freep) SharedPolicy *sp = NULL;
131 r = pthread_attr_init(&attr);
133 r = log_error_errno(errno, "Cannot initialize pthread attributes: %m");
137 r = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
139 r = log_error_errno(errno, "Cannot mark pthread attributes as detached: %m");
143 r = shared_policy_new(&sp);
152 fd = accept4(accept_fd, NULL, NULL, SOCK_NONBLOCK | SOCK_CLOEXEC);
154 if (errno == EAGAIN || errno == EINTR)
157 r = log_error_errno(errno, "accept4() failed: %m");
161 r = client_context_new(&c);
170 c->bus_uid = bus_uid;
172 r = pthread_create(&tid, &attr, run_client, c);
174 log_error("Cannot spawn thread: %m");
175 client_context_free(c);
181 pthread_attr_destroy(&attr);
186 static int help(void) {
188 printf("%s [OPTIONS...]\n\n"
189 "DBus proxy server.\n\n"
190 " -h --help Show this help\n"
191 " --version Show package version\n"
192 " --configuration=PATH Configuration file or directory\n"
193 " --machine=MACHINE Connect to specified machine\n"
194 " --address=ADDRESS Connect to the bus specified by ADDRESS\n"
195 " (default: " DEFAULT_SYSTEM_BUS_ADDRESS ")\n",
196 program_invocation_short_name);
201 static int parse_argv(int argc, char *argv[]) {
210 static const struct option options[] = {
211 { "help", no_argument, NULL, 'h' },
212 { "version", no_argument, NULL, ARG_VERSION },
213 { "address", required_argument, NULL, ARG_ADDRESS },
214 { "configuration", required_argument, NULL, ARG_CONFIGURATION },
215 { "machine", required_argument, NULL, ARG_MACHINE },
224 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
233 puts(PACKAGE_STRING);
234 puts(SYSTEMD_FEATURES);
249 case ARG_CONFIGURATION:
250 r = strv_extend(&arg_configuration, optarg);
256 _cleanup_free_ char *e = NULL;
259 e = bus_address_escape(optarg);
264 a = strjoin("x-machine-kernel:machine=", e, ";x-machine-unix:machine=", e, NULL);
266 a = strjoin("x-machine-unix:machine=", e, NULL);
281 assert_not_reached("Unhandled option");
285 log_error("Too many arguments");
290 arg_address = strdup(DEFAULT_SYSTEM_BUS_ADDRESS);
298 int main(int argc, char *argv[]) {
299 const char *user = "systemd-bus-proxy";
304 log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
305 log_parse_environment();
310 if (geteuid() == 0) {
311 r = get_user_creds(&user, &uid, &gid, NULL, NULL);
313 log_error_errno(r, "Cannot resolve user name %s: %m", user);
317 r = drop_privileges(uid, gid, 1ULL << CAP_IPC_OWNER);
319 log_error_errno(r, "Cannot drop privileges: %m");
324 r = parse_argv(argc, argv);
328 r = sd_listen_fds(0);
330 log_error("Illegal number of file descriptors passed");
334 accept_fd = SD_LISTEN_FDS_START;
335 r = fd_nonblock(accept_fd, false);
337 log_error_errno(r, "Cannot mark accept-fd non-blocking: %m");
341 r = loop_clients(accept_fd, bus_uid);
346 "STATUS=Shutting down.");
348 strv_free(arg_configuration);
351 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;