code.delx.au - pulseaudio/blob - src/daemon/main.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <unistd.h>
  27 #include <errno.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <stdio.h>
  31 #include <signal.h>
  32 #include <stddef.h>
  33 #include <assert.h>
  34 #include <ltdl.h>
  35 #include <limits.h>
  36 #include <fcntl.h>
  37 #include <unistd.h>
  38 #include <sys/types.h>
  39 #include <liboil/liboil.h>
  40
  41 #ifdef HAVE_SYS_IOCTL_H
  42 #include <sys/ioctl.h>
  43 #endif
  44
  45 #ifdef HAVE_LIBWRAP
  46 #include <syslog.h>
  47 #include <tcpd.h>
  48 #endif
  49
  50 #include "../polypcore/winsock.h"
  51
  52 #include <polyp/mainloop.h>
  53 #include <polyp/mainloop-signal.h>
  54
  55 #include <polypcore/core.h>
  56 #include <polypcore/memblock.h>
  57 #include <polypcore/module.h>
  58 #include <polypcore/cli-command.h>
  59 #include <polypcore/log.h>
  60 #include <polypcore/util.h>
  61 #include <polypcore/sioman.h>
  62 #include <polypcore/xmalloc.h>
  63 #include <polypcore/cli-text.h>
  64 #include <polypcore/pid.h>
  65 #include <polypcore/namereg.h>
  66
  67 #include "cmdline.h"
  68 #include "cpulimit.h"
  69 #include "daemon-conf.h"
  70 #include "dumpmodules.h"
  71 #include "caps.h"
  72
  73 #ifdef HAVE_LIBWRAP
  74 /* Only one instance of these variables */
  75 int allow_severity = LOG_INFO;
  76 int deny_severity = LOG_WARNING;
  77 #endif
  78
  79 #ifdef OS_IS_WIN32
  80
  81 static void message_cb(pa_mainloop_api*a, pa_defer_event *e, void *userdata) {
  82     MSG msg;
  83
  84     while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
  85         if (msg.message == WM_QUIT)
  86             raise(SIGTERM);
  87         else {
  88             TranslateMessage(&msg);
  89             DispatchMessage(&msg);
  90         }
  91     }
  92 }
  93
  94 #endif
  95
  96 static void signal_callback(pa_mainloop_api*m, PA_GCC_UNUSED pa_signal_event *e, int sig, void *userdata) {
  97     pa_log_info(__FILE__": Got signal %s.\n", pa_strsignal(sig));
  98
  99     switch (sig) {
 100 #ifdef SIGUSR1
 101         case SIGUSR1:
 102             pa_module_load(userdata, "module-cli", NULL);
 103             break;
 104 #endif
 105
 106 #ifdef SIGUSR2
 107         case SIGUSR2:
 108             pa_module_load(userdata, "module-cli-protocol-unix", NULL);
 109             break;
 110 #endif
 111
 112 #ifdef SIGHUP
 113         case SIGHUP: {
 114             char *c = pa_full_status_string(userdata);
 115             pa_log_notice(c);
 116             pa_xfree(c);
 117             return;
 118         }
 119 #endif
 120
 121         case SIGINT:
 122         case SIGTERM:
 123         default:
 124             pa_log_info(__FILE__": Exiting.\n");
 125             m->quit(m, 1);
 126             break;
 127     }
 128 }
 129
 130 static void close_pipe(int p[2]) {
 131     if (p[0] != -1)
 132         close(p[0]);
 133     if (p[1] != -1)
 134         close(p[1]);
 135     p[0] = p[1] = -1;
 136 }
 137
 138 int main(int argc, char *argv[]) {
 139     pa_core *c;
 140     pa_strbuf *buf = NULL;
 141     pa_daemon_conf *conf;
 142     pa_mainloop *mainloop;
 143
 144     char *s;
 145     int r, retval = 1, d = 0;
 146     int daemon_pipe[2] = { -1, -1 };
 147     int suid_root;
 148     int valid_pid_file = 0;
 149
 150 #ifdef HAVE_GETUID
 151     gid_t gid = (gid_t) -1;
 152 #endif
 153
 154 #ifdef OS_IS_WIN32
 155     pa_defer_event *defer;
 156 #endif
 157
 158     pa_limit_caps();
 159
 160 #ifdef HAVE_GETUID
 161     suid_root = getuid() != 0 && geteuid() == 0;
 162
 163     if (suid_root && (pa_uid_in_group("realtime", &gid) <= 0 || gid >= 1000)) {
 164         pa_log_warn(__FILE__": WARNING: called SUID root, but not in group 'realtime'.\n");
 165         pa_drop_root();
 166     }
 167 #else
 168     suid_root = 0;
 169 #endif
 170
 171     LTDL_SET_PRELOADED_SYMBOLS();
 172
 173     r = lt_dlinit();
 174     assert(r == 0);
 175
 176 #ifdef OS_IS_WIN32
 177     {
 178         WSADATA data;
 179         WSAStartup(MAKEWORD(2, 0), &data);
 180     }
 181 #endif
 182
 183     pa_log_set_ident("polypaudio");
 184
 185     conf = pa_daemon_conf_new();
 186
 187     if (pa_daemon_conf_load(conf, NULL) < 0)
 188         goto finish;
 189
 190     if (pa_daemon_conf_env(conf) < 0)
 191         goto finish;
 192
 193     if (pa_cmdline_parse(conf, argc, argv, &d) < 0) {
 194         pa_log(__FILE__": failed to parse command line.\n");
 195         goto finish;
 196     }
 197
 198     pa_log_set_maximal_level(conf->log_level);
 199     pa_log_set_target(conf->auto_log_target ? PA_LOG_STDERR : conf->log_target, NULL);
 200
 201     if (conf->high_priority && conf->cmd == PA_CMD_DAEMON)
 202         pa_raise_priority();
 203
 204     pa_drop_caps();
 205
 206     if (suid_root)
 207         pa_drop_root();
 208
 209     if (conf->dl_search_path)
 210         lt_dlsetsearchpath(conf->dl_search_path);
 211
 212     switch (conf->cmd) {
 213         case PA_CMD_DUMP_MODULES:
 214             pa_dump_modules(conf, argc-d, argv+d);
 215             retval = 0;
 216             goto finish;
 217
 218         case PA_CMD_DUMP_CONF: {
 219             s = pa_daemon_conf_dump(conf);
 220             fputs(s, stdout);
 221             pa_xfree(s);
 222             retval = 0;
 223             goto finish;
 224         }
 225
 226         case PA_CMD_HELP :
 227             pa_cmdline_help(argv[0]);
 228             retval = 0;
 229             goto finish;
 230
 231         case PA_CMD_VERSION :
 232             printf(PACKAGE_NAME" "PACKAGE_VERSION"\n");
 233             retval = 0;
 234             goto finish;
 235
 236         case PA_CMD_CHECK: {
 237             pid_t pid;
 238
 239             if (pa_pid_file_check_running(&pid) < 0) {
 240                 pa_log_info(__FILE__": daemon not running\n");
 241             } else {
 242                 pa_log_info(__FILE__": daemon running as PID %u\n", pid);
 243                 retval = 0;
 244             }
 245
 246             goto finish;
 247
 248         }
 249         case PA_CMD_KILL:
 250
 251             if (pa_pid_file_kill(SIGINT, NULL) < 0)
 252                 pa_log(__FILE__": failed to kill daemon.\n");
 253             else
 254                 retval = 0;
 255
 256             goto finish;
 257
 258         default:
 259             assert(conf->cmd == PA_CMD_DAEMON);
 260     }
 261
 262     if (conf->daemonize) {
 263         pid_t child;
 264         int tty_fd;
 265
 266         if (pa_stdio_acquire() < 0) {
 267             pa_log(__FILE__": failed to acquire stdio.\n");
 268             goto finish;
 269         }
 270
 271 #ifdef HAVE_FORK
 272         if (pipe(daemon_pipe) < 0) {
 273             pa_log(__FILE__": failed to create pipe.\n");
 274             goto finish;
 275         }
 276
 277         if ((child = fork()) < 0) {
 278             pa_log(__FILE__": fork() failed: %s\n", strerror(errno));
 279             goto finish;
 280         }
 281
 282         if (child != 0) {
 283             /* Father */
 284
 285             close(daemon_pipe[1]);
 286             daemon_pipe[1] = -1;
 287
 288             if (pa_loop_read(daemon_pipe[0], &retval, sizeof(retval)) != sizeof(retval)) {
 289                 pa_log(__FILE__": read() failed: %s\n", strerror(errno));
 290                 retval = 1;
 291             }
 292
 293             if (retval)
 294                 pa_log(__FILE__": daemon startup failed.\n");
 295             else
 296                 pa_log_info(__FILE__": daemon startup successful.\n");
 297
 298             goto finish;
 299         }
 300
 301         close(daemon_pipe[0]);
 302         daemon_pipe[0] = -1;
 303 #endif
 304
 305         if (conf->auto_log_target)
 306             pa_log_set_target(PA_LOG_SYSLOG, NULL);
 307
 308 #ifdef HAVE_SETSID
 309         setsid();
 310 #endif
 311 #ifdef HAVE_SETPGID
 312         setpgid(0,0);
 313 #endif
 314
 315 #ifndef OS_IS_WIN32
 316         close(0);
 317         close(1);
 318         close(2);
 319
 320         open("/dev/null", O_RDONLY);
 321         open("/dev/null", O_WRONLY);
 322         open("/dev/null", O_WRONLY);
 323 #else
 324         FreeConsole();
 325 #endif
 326
 327 #ifdef SIGTTOU
 328         signal(SIGTTOU, SIG_IGN);
 329 #endif
 330 #ifdef SIGTTIN
 331         signal(SIGTTIN, SIG_IGN);
 332 #endif
 333 #ifdef SIGTSTP
 334         signal(SIGTSTP, SIG_IGN);
 335 #endif
 336
 337 #ifdef TIOCNOTTY
 338         if ((tty_fd = open("/dev/tty", O_RDWR)) >= 0) {
 339             ioctl(tty_fd, TIOCNOTTY, (char*) 0);
 340             close(tty_fd);
 341         }
 342 #endif
 343     }
 344
 345     chdir("/");
 346
 347     if (conf->use_pid_file) {
 348         if (pa_pid_file_create() < 0) {
 349             pa_log(__FILE__": pa_pid_file_create() failed.\n");
 350 #ifdef HAVE_FORK
 351             if (conf->daemonize)
 352                 pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 353 #endif
 354             goto finish;
 355         }
 356
 357         valid_pid_file = 1;
 358     }
 359
 360     mainloop = pa_mainloop_new();
 361     assert(mainloop);
 362
 363     c = pa_core_new(pa_mainloop_get_api(mainloop));
 364     assert(c);
 365
 366     r = pa_signal_init(pa_mainloop_get_api(mainloop));
 367     assert(r == 0);
 368     pa_signal_new(SIGINT, signal_callback, c);
 369     pa_signal_new(SIGTERM, signal_callback, c);
 370 #ifdef SIGPIPE
 371     signal(SIGPIPE, SIG_IGN);
 372 #endif
 373
 374 #ifdef OS_IS_WIN32
 375     defer = pa_mainloop_get_api(mainloop)->defer_new(pa_mainloop_get_api(mainloop), message_cb, NULL);
 376     assert(defer);
 377 #endif
 378
 379     if (conf->daemonize)
 380         c->running_as_daemon = 1;
 381
 382 #ifdef SIGUSR1
 383     pa_signal_new(SIGUSR1, signal_callback, c);
 384 #endif
 385 #ifdef SIGUSR2
 386     pa_signal_new(SIGUSR2, signal_callback, c);
 387 #endif
 388 #ifdef SIGHUP
 389     pa_signal_new(SIGHUP, signal_callback, c);
 390 #endif
 391
 392     oil_init();
 393
 394     r = pa_cpu_limit_init(pa_mainloop_get_api(mainloop));
 395     assert(r == 0);
 396
 397     buf = pa_strbuf_new();
 398     assert(buf);
 399     if (conf->default_script_file)
 400         r = pa_cli_command_execute_file(c, conf->default_script_file, buf, &conf->fail);
 401
 402     if (r >= 0)
 403         r = pa_cli_command_execute(c, conf->script_commands, buf, &conf->fail);
 404     pa_log(s = pa_strbuf_tostring_free(buf));
 405     pa_xfree(s);
 406
 407     if (r < 0 && conf->fail) {
 408         pa_log(__FILE__": failed to initialize daemon.\n");
 409 #ifdef HAVE_FORK
 410         if (conf->daemonize)
 411             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 412 #endif
 413     } else if (!c->modules || pa_idxset_size(c->modules) == 0) {
 414         pa_log(__FILE__": daemon startup without any loaded modules, refusing to work.\n");
 415 #ifdef HAVE_FORK
 416         if (conf->daemonize)
 417             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 418 #endif
 419     } else {
 420
 421         retval = 0;
 422 #ifdef HAVE_FORK
 423         if (conf->daemonize)
 424             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 425 #endif
 426
 427         c->disallow_module_loading = conf->disallow_module_loading;
 428         c->exit_idle_time = conf->exit_idle_time;
 429         c->module_idle_time = conf->module_idle_time;
 430         c->scache_idle_time = conf->scache_idle_time;
 431         c->resample_method = conf->resample_method;
 432
 433         if (c->default_sink_name &&
 434             pa_namereg_get(c, c->default_sink_name, PA_NAMEREG_SINK, 1) == NULL) {
 435             pa_log_error("%s : Fatal error. Default sink name (%s) does not exist in name register.\n", __FILE__, c->default_sink_name);
 436             retval = 1;
 437         } else {
 438             pa_log_info(__FILE__": Daemon startup complete.\n");
 439             if (pa_mainloop_run(mainloop, &retval) < 0)
 440                 retval = 1;
 441             pa_log_info(__FILE__": Daemon shutdown initiated.\n");
 442         }
 443     }
 444
 445 #ifdef OS_IS_WIN32
 446     pa_mainloop_get_api(mainloop)->defer_free(defer);
 447 #endif
 448
 449     pa_core_free(c);
 450
 451     pa_cpu_limit_done();
 452     pa_signal_done();
 453     pa_mainloop_free(mainloop);
 454
 455     pa_log_info(__FILE__": Daemon terminated.\n");
 456
 457 finish:
 458
 459     if (conf)
 460         pa_daemon_conf_free(conf);
 461
 462     if (valid_pid_file)
 463         pa_pid_file_remove();
 464
 465     close_pipe(daemon_pipe);
 466
 467 #ifdef OS_IS_WIN32
 468     WSACleanup();
 469 #endif
 470
 471     lt_dlexit();
 472
 473     return retval;
 474 }