1 /* Copyright (C) 2009-2014, Martin Johansson <martin@fatbob.nu>
2 Copyright (C) 2005-2014, Thorvald Natvig <thorvald@natvig.com>
6 Redistribution and use in source and binary forms, with or without
7 modification, are permitted provided that the following conditions
10 - Redistributions of source code must retain the above copyright notice,
11 this list of conditions and the following disclaimer.
12 - Redistributions in binary form must reproduce the above copyright notice,
13 this list of conditions and the following disclaimer in the documentation
14 and/or other materials provided with the distribution.
15 - Neither the name of the Developers nor the names of its contributors may
16 be used to endorse or promote products derived from this software without
17 specific prior written permission.
19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
23 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 #include <sys/types.h>
36 #include <sys/utsname.h>
44 #ifdef _POSIX_PRIORITY_SCHEDULING
45 #if (_POSIX_PRIORITY_SCHEDULING > 0)
46 #define POSIX_PRIORITY_SCHEDULING
58 #include "sharedmemory.h"
60 char system_string[64], version_string[64];
66 void lockfile(const char *pidfile)
71 /* Don't use O_TRUNC here -- we want to leave the PID file
72 * unmodified if we cannot lock it.
74 lfp = open(pidfile, O_WRONLY|O_CREAT, 0640);
77 Log_fatal("Cannot open PID-file %s for writing", pidfile);
79 /* Try to lock the file. */
80 if (lockf(lfp, F_TLOCK, 0) < 0) {
83 if (errno == EACCES || errno == EAGAIN)
84 Log_fatal("PID file is locked -- uMurmur already running?");
86 Log_fatal("Cannot lock PID file: %s", strerror(errno));
89 /* Now that we locked the file, erase its contents. */
90 if (ftruncate(lfp, 0) < 0) {
92 Log_fatal("Cannot truncate PID file: %s", strerror(errno));
95 snprintf(str,16,"%d\n", getpid());
96 (void)write(lfp, str, strlen(str)); /* record pid to lockfile */
97 Log_info("PID-file: %s", pidfile);
99 /* If uMurmur ever starts to fork()+exec(), we don't want it to
100 * leak the fd to the forked process though. Set the close-on-exec
101 * flag to prevent leakage.
103 flags = fcntl(lfp, F_GETFD, 0);
105 fcntl(lfp, F_SETFD, (long) flags);
107 /* Don't close(lfp) here!
108 * We want the fd to remain opened so the lock is held until the
114 /* Drops privileges (if configured to do so). */
115 static void switch_user(void)
118 struct group *grp = NULL;
119 const char *username, *groupname;
122 username = getStrConf(USERNAME);
123 groupname = getStrConf(GROUPNAME);
126 /* It's an error to specify groupname
127 * but leave username empty.
130 Log_fatal("username missing");
136 pwd = getpwnam(username);
138 Log_fatal("Unknown user '%s'", username);
143 grp = getgrnam(groupname);
146 Log_fatal("Unknown group '%s'", groupname);
151 if (initgroups(pwd->pw_name, gid))
152 Log_fatal("initgroups() failed: %s", strerror(errno));
155 Log_fatal("setgid() failed: %s", strerror(errno));
157 if (setuid(pwd->pw_uid))
158 Log_fatal("setuid() failed: %s", strerror(errno));
163 Log_fatal("getgrgid() failed: %s", strerror(errno));
165 Log_info("Switch to user '%s' group '%s'", pwd->pw_name, grp->gr_name);
168 void signal_handler(int sig)
172 Log_info("HUP signal received.");
176 Log_info("TERM signal. Shutting down.");
187 return; /* already a daemon */
190 fprintf(stderr, "Fork error. Exiting\n");
191 exit(1); /* fork error */
194 exit(0); /* parent exits */
196 /* child (daemon) continues */
197 setsid(); /* obtain a new process group */
198 for (i = getdtablesize(); i >= 0; --i)
199 close(i); /* close all descriptors */
201 i = open("/dev/null",O_RDWR);
205 umask(027); /* set newly created file permissions */
210 #ifdef POSIX_PRIORITY_SCHEDULING
214 struct sched_param sp;
216 sp.sched_priority = sched_get_priority_min(SCHED_RR); /* Should suffice */
217 Log_info("Setting SCHED_RR prio %d", sp.sched_priority);
218 rc = sched_setscheduler(0, SCHED_RR, &sp);
220 Log_warn("Failed to set scheduler: %s", strerror(errno));
226 printf("uMurmur version %s ('%s'). Mumble protocol %d.%d.%d\n", UMURMUR_VERSION,
227 UMURMUR_CODENAME, PROTVER_MAJOR, PROTVER_MINOR, PROTVER_PATCH);
228 printf("Usage: umurmurd [-d] [-r] [-h] [-p <pidfile>] [-t] [-c <conf file>] [-a <addr>] [-b <port>]\n");
229 printf(" -d - Do not daemonize - run in foreground.\n");
230 #ifdef POSIX_PRIORITY_SCHEDULING
231 printf(" -r - Run with realtime priority\n");
233 printf(" -p <pidfile> - Write PID to this file\n");
234 printf(" -c <conf file> - Specify configuration file (default %s)\n", DEFAULT_CONFIG);
235 printf(" -t - Test config. Error message to stderr + non-zero exit code on error\n");
236 printf(" -a <address> - Bind to IP address\n");
237 printf(" -A <address> - Bind to IPv6 address\n");
238 printf(" -b <port> - Bind to port\n");
239 printf(" -B <port> - Bind to port (IPv6)\n");
240 printf(" -h - Print this help\n");
244 int main(int argc, char **argv)
246 bool_t nodaemon = false;
247 #ifdef POSIX_PRIORITY_SCHEDULING
248 bool_t realtime = false;
250 bool_t testconfig = false;
251 char *conffile = NULL, *pidfile = NULL;
253 struct utsname utsbuf;
256 #ifdef POSIX_PRIORITY_SCHEDULING
257 while ((c = getopt(argc, argv, "drp:c:a:A:b:B:ht")) != EOF) {
259 while ((c = getopt(argc, argv, "dp:c:a:A:b:B:ht")) != EOF) {
275 bindport = atoi(optarg);
278 bindport6 = atoi(optarg);
289 #ifdef POSIX_PRIORITY_SCHEDULING
295 fprintf(stderr, "Unrecognized option\n");
302 if (!Conf_ok(conffile))
308 /* Initialize the config subsystem early;
309 * switch_user() will need to read some config variables as well as logging.
313 /* Logging to terminal if not daemonizing, otherwise to syslog or log file.
323 /* Reopen log file. If user switch results in access denied, we catch
330 signal(SIGCHLD, SIG_IGN); /* ignore child */
331 signal(SIGTSTP, SIG_IGN); /* ignore tty signals */
332 signal(SIGTTOU, SIG_IGN);
333 signal(SIGTTIN, SIG_IGN);
334 signal(SIGPIPE, SIG_IGN);
335 signal(SIGHUP, signal_handler); /* catch hangup signal */
336 signal(SIGTERM, signal_handler); /* catch kill signal */
338 /* Build system string */
339 if (uname(&utsbuf) == 0) {
340 snprintf(system_string, 64, "%s %s", utsbuf.sysname, utsbuf.machine);
341 snprintf(version_string, 64, "%s", utsbuf.release);
344 snprintf(system_string, 64, "unknown unknown");
345 snprintf(version_string, 64, "unknown");
354 #ifdef USE_SHAREDMEMORY_API
358 #ifdef POSIX_PRIORITY_SCHEDULING
365 #ifdef USE_SHAREDMEMORY_API
366 Sharedmemory_deinit();