1 /* Copyright (C) 2009-2010, Martin Johansson <martin@fatbob.nu>
2 Copyright (C) 2005-2010, 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.
35 #include <sys/types.h>
37 #include <sys/utsname.h>
45 #ifdef _POSIX_PRIORITY_SCHEDULING
56 char system_string[64], version_string[64];
60 void lockfile(const char *pidfile)
65 /* Don't use O_TRUNC here -- we want to leave the PID file
66 * unmodified if we cannot lock it.
68 lfp = open(pidfile, O_WRONLY|O_CREAT, 0640);
71 Log_fatal("Cannot open PID-file %s for writing", pidfile);
73 /* Try to lock the file. */
74 if (lockf(lfp, F_TLOCK, 0) < 0) {
77 if (errno == EACCES || errno == EAGAIN)
78 Log_fatal("PID file is locked -- uMurmur already running?");
80 Log_fatal("Cannot lock PID file: %s", strerror(errno));
83 /* Now that we locked the file, erase its contents. */
84 if (ftruncate(lfp, 0) < 0) {
86 Log_fatal("Cannot truncate PID file: %s", strerror(errno));
89 snprintf(str,16,"%d\n", getpid());
90 write(lfp, str, strlen(str)); /* record pid to lockfile */
91 Log_info("PID-file: %s", pidfile);
93 /* If uMurmur ever starts to fork()+exec(), we don't want it to
94 * leak the fd to the forked process though. Set the close-on-exec
95 * flag to prevent leakage.
97 flags = fcntl(lfp, F_GETFD, 0);
99 fcntl(lfp, F_SETFD, (long) flags);
101 /* Don't close(lfp) here!
102 * We want the fd to remain opened so the lock is held until the
108 /* Drops privileges (if configured to do so). */
109 static void switch_user(void)
112 struct group *grp = NULL;
113 const char *username, *groupname;
116 username = getStrConf(USERNAME);
117 groupname = getStrConf(GROUPNAME);
120 /* It's an error to specify groupname
121 * but leave username empty.
124 Log_fatal("username missing");
130 pwd = getpwnam(username);
132 Log_fatal("Unknown user '%s'", username);
137 grp = getgrnam(groupname);
140 Log_fatal("Unknown group '%s'", groupname);
145 if (initgroups(pwd->pw_name, gid))
146 Log_fatal("initgroups() failed: %s", strerror(errno));
149 Log_fatal("setgid() failed: %s", strerror(errno));
151 if (setuid(pwd->pw_uid))
152 Log_fatal("setuid() failed: %s", strerror(errno));
157 Log_fatal("getgrgid() failed: %s", strerror(errno));
159 Log_info("Switch to user '%s' group '%s'", pwd->pw_name, grp->gr_name);
162 void signal_handler(int sig)
166 Log_info("HUP signal received.");
170 Log_info("TERM signal. Shutting down.");
181 return; /* already a daemon */
184 fprintf(stderr, "Fork error. Exiting\n");
185 exit(1); /* fork error */
188 exit(0); /* parent exits */
190 /* child (daemon) continues */
191 setsid(); /* obtain a new process group */
192 for (i = getdtablesize(); i >= 0; --i)
193 close(i); /* close all descriptors */
195 i = open("/dev/null",O_RDWR);
199 umask(027); /* set newly created file permissions */
204 #ifdef _POSIX_PRIORITY_SCHEDULING
208 struct sched_param sp;
210 sp.sched_priority = sched_get_priority_min(SCHED_RR); /* Should suffice */
211 Log_info("Setting SCHED_RR prio %d", sp.sched_priority);
212 rc = sched_setscheduler(0, SCHED_RR, &sp);
214 Log_warn("Failed to set scheduler: %s", strerror(errno));
220 printf("uMurmur version %s. Mumble protocol %d.%d.%d\n", UMURMUR_VERSION, PROTVER_MAJOR, PROTVER_MINOR, PROTVER_PATCH);
221 printf("Usage: umurmurd [-d] [-p <pidfile>] [-c <conf file>] [-h]\n");
222 printf(" -d - Do not daemonize\n");
223 printf(" -p <pidfile> - Write PID to this file\n");
224 printf(" -c <conf file> - Specify configuration file\n");
225 #ifdef _POSIX_PRIORITY_SCHEDULING
226 printf(" -r - Run with realtime priority\n");
228 printf(" -a <address> - Bind to IP address\n");
229 printf(" -b <port> - Bind to port\n");
230 printf(" -h - Print this help\n");
234 int main(int argc, char **argv)
236 bool_t nodaemon = false;
237 #ifdef _POSIX_PRIORITY_SCHEDULING
238 bool_t realtime = false;
240 char *conffile = NULL, *pidfile = NULL;
242 struct utsname utsbuf;
245 #ifdef _POSIX_PRIORITY_SCHEDULING
246 while ((c = getopt(argc, argv, "drp:c:a:b:h")) != EOF) {
248 while ((c = getopt(argc, argv, "dp:c:a:b:h")) != EOF) {
261 bindport = atoi(optarg);
269 #ifdef _POSIX_PRIORITY_SCHEDULING
275 fprintf(stderr, "Unrecognized option\n");
281 /* Initialize the config subsystem early;
282 * switch_user() will need to read some config variables as well as logging.
286 /* Logging to terminal if not daemonizing, otherwise to syslog or log file.
296 /* Reopen log file. If user switch results in access denied, we catch
303 signal(SIGCHLD, SIG_IGN); /* ignore child */
304 signal(SIGTSTP, SIG_IGN); /* ignore tty signals */
305 signal(SIGTTOU, SIG_IGN);
306 signal(SIGTTIN, SIG_IGN);
307 signal(SIGPIPE, SIG_IGN);
308 signal(SIGHUP, signal_handler); /* catch hangup signal */
309 signal(SIGTERM, signal_handler); /* catch kill signal */
311 /* Build system string */
312 if (uname(&utsbuf) == 0) {
313 snprintf(system_string, 64, "%s %s", utsbuf.sysname, utsbuf.machine);
314 snprintf(version_string, 64, "%s", utsbuf.release);
317 snprintf(system_string, 64, "unknown unknown");
318 snprintf(version_string, 64, "unknown");
326 #ifdef _POSIX_PRIORITY_SCHEDULING