summaryrefslogtreecommitdiffstats
path: root/src/daemon/main.c
blob: c41c69df627a56671b6623434e3a57ef98daa634 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
/* $Id$ */

/***
  This file is part of PulseAudio.
 
  PulseAudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published
  by the Free Software Foundation; either version 2 of the License,
  or (at your option) any later version.
 
  PulseAudio is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public License
  along with PulseAudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <stddef.h>
#include <assert.h>
#include <ltdl.h>
#include <limits.h>
#include <fcntl.h>
#include <unistd.h>
#include <locale.h>
#include <sys/types.h>
#include <liboil/liboil.h>

#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif

#ifdef HAVE_LIBWRAP
#include <syslog.h>
#include <tcpd.h>
#endif

#include "../pulsecore/winsock.h"

#include <pulse/mainloop.h>
#include <pulse/mainloop-signal.h>
#include <pulse/xmalloc.h>

#include <pulsecore/core-error.h>
#include <pulsecore/core.h>
#include <pulsecore/memblock.h>
#include <pulsecore/module.h>
#include <pulsecore/cli-command.h>
#include <pulsecore/log.h>
#include <pulsecore/core-util.h>
#include <pulsecore/sioman.h>
#include <pulsecore/cli-text.h>
#include <pulsecore/pid.h>
#include <pulsecore/namereg.h>
#include <pulsecore/random.h>

#include "cmdline.h"
#include "cpulimit.h"
#include "daemon-conf.h"
#include "dumpmodules.h"
#include "caps.h"

#ifdef HAVE_LIBWRAP
/* Only one instance of these variables */
int allow_severity = LOG_INFO;
int deny_severity = LOG_WARNING;
#endif

#ifdef HAVE_OSS
/* padsp looks for this symbol in the running process and disables
 * itself if it finds it and it is set to 7 (which is actually a bit
 * mask). For details see padsp. */
int __padsp_disabled__ = 7;
#endif

#ifdef OS_IS_WIN32

static void message_cb(pa_mainloop_api*a, pa_time_event*e, PA_GCC_UNUSED const struct timeval *tv, void *userdata) {
    MSG msg;
    struct timeval tvnext;

    while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
        if (msg.message == WM_QUIT)
            raise(SIGTERM);
        else {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    pa_timeval_add(pa_gettimeofday(&tvnext), 100000);
    a->time_restart(e, &tvnext);
}

#endif

static void signal_callback(pa_mainloop_api*m, PA_GCC_UNUSED pa_signal_event *e, int sig, void *userdata) {
    pa_log_info(__FILE__": Got signal %s.", pa_strsignal(sig));

    switch (sig) {
#ifdef SIGUSR1
        case SIGUSR1:
            pa_module_load(userdata, "module-cli", NULL);
            break;
#endif
            
#ifdef SIGUSR2
        case SIGUSR2:
            pa_module_load(userdata, "module-cli-protocol-unix", NULL);
            break;
#endif

#ifdef SIGHUP
        case SIGHUP: {
            char *c = pa_full_status_string(userdata);
            pa_log_notice("%s", c);
            pa_xfree(c);
            return;
        }
#endif

        case SIGINT:
        case SIGTERM:
        default:
            pa_log_info(__FILE__": Exiting.");
            m->quit(m, 1);
            break;
    }
}

static void close_pipe(int p[2]) {
    if (p[0] != -1)
        close(p[0]);
    if (p[1] != -1)
        close(p[1]);
    p[0] = p[1] = -1;
}

int main(int argc, char *argv[]) {
    pa_core *c;
    pa_strbuf *buf = NULL;
    pa_daemon_conf *conf;
    pa_mainloop *mainloop;

    char *s; 
    int r, retval = 1, d = 0;
    int daemon_pipe[2] = { -1, -1 };
    int suid_root;
    int valid_pid_file = 0;

#ifdef HAVE_GETUID
    gid_t gid = (gid_t) -1;
#endif

#ifdef OS_IS_WIN32
    pa_time_event *timer;
    struct timeval tv;
#endif

    setlocale(LC_ALL, "");

    pa_limit_caps();

#ifdef HAVE_GETUID
    suid_root = getuid() != 0 && geteuid() == 0;
    
    if (suid_root && (pa_own_uid_in_group("realtime", &gid) <= 0 || gid >= 1000)) {
        pa_log_warn(__FILE__": WARNING: called SUID root, but not in group 'realtime'.");
        pa_drop_root();
    }
#else
    suid_root = 0;
#endif
    
    LTDL_SET_PRELOADED_SYMBOLS();
    
    r = lt_dlinit();
    assert(r == 0);

#ifdef OS_IS_WIN32
    {
        WSADATA data;
        WSAStartup(MAKEWORD(2, 0), &data);
    }
#endif

    pa_random_seed();
    
    pa_log_set_ident("pulseaudio");
    
    conf = pa_daemon_conf_new();
    
    if (pa_daemon_conf_load(conf, NULL) < 0)
        goto finish;

    if (pa_daemon_conf_env(conf) < 0)
        goto finish;

    if (pa_cmdline_parse(conf, argc, argv, &d) < 0) {
        pa_log(__FILE__": failed to parse command line.");
        goto finish;
    }

    pa_log_set_maximal_level(conf->log_level);
    pa_log_set_target(conf->auto_log_target ? PA_LOG_STDERR : conf->log_target, NULL);

    if (conf->high_priority && conf->cmd == PA_CMD_DAEMON)
        pa_raise_priority();

    pa_drop_caps();

    if (suid_root)
        pa_drop_root();
    
    if (conf->dl_search_path)
        lt_dlsetsearchpath(conf->dl_search_path);

    switch (conf->cmd) {
        case PA_CMD_DUMP_MODULES:
            pa_dump_modules(conf, argc-d, argv+d);
            retval = 0;
            goto finish;

        case PA_CMD_DUMP_CONF: {
            s = pa_daemon_conf_dump(conf);
            fputs(s, stdout);
            pa_xfree(s);
            retval = 0;
            goto finish;
        }

        case PA_CMD_HELP :
            pa_cmdline_help(argv[0]);
            retval = 0;
            goto finish;

        case PA_CMD_VERSION :
            printf(PACKAGE_NAME" "PACKAGE_VERSION"\n");
            retval = 0;
            goto finish;

        case PA_CMD_CHECK: {
            pid_t pid;

            if (pa_pid_file_check_running(&pid) < 0) {
                pa_log_info(__FILE__": daemon not running");
            } else {
                pa_log_info(__FILE__": daemon running as PID %u", pid);
                retval = 0;
            }

            goto finish;

        }
        case PA_CMD_KILL:

            if (pa_pid_file_kill(SIGINT, NULL) < 0)
                pa_log(__FILE__": failed to kill daemon.");
            else
                retval = 0;
            
            goto finish;
            
        default:
            assert(conf->cmd == PA_CMD_DAEMON);
    }

    if (conf->daemonize) {
        pid_t child;
        int tty_fd;

        if (pa_stdio_acquire() < 0) {
            pa_log(__FILE__": failed to acquire stdio.");
            goto finish;
        }

#ifdef HAVE_FORK
        if (pipe(daemon_pipe) < 0) {
            pa_log(__FILE__": failed to create pipe.");
            goto finish;
        }
        
        if ((child = fork()) < 0) {
            pa_log(__FILE__": fork() failed: %s", pa_cstrerror(errno));
            goto finish;
        }

        if (child != 0) {
            /* Father */

            close(daemon_pipe[1]);
            daemon_pipe[1] = -1;

            if (pa_loop_read(daemon_pipe[0], &retval, sizeof(retval), NULL) != sizeof(retval)) {
                pa_log(__FILE__": read() failed: %s", pa_cstrerror(errno));
                retval = 1;
            }

            if (retval)
                pa_log(__FILE__": daemon startup failed.");
            else
                pa_log_info(__FILE__": daemon startup successful.");
            
            goto finish;
        }

        close(daemon_pipe[0]);
        daemon_pipe[0] = -1;
#endif

        if (conf->auto_log_target)
            pa_log_set_target(PA_LOG_SYSLOG, NULL);

#ifdef HAVE_SETSID
        setsid();
#endif
#ifdef HAVE_SETPGID
        setpgid(0,0);
#endif

#ifndef OS_IS_WIN32
        close(0);
        close(1);
        close(2);

        open("/dev/null", O_RDONLY);
        open("/dev/null", O_WRONLY);
        open("/dev/null", O_WRONLY);
#else
        FreeConsole();
#endif

#ifdef SIGTTOU
        signal(SIGTTOU, SIG_IGN);
#endif
#ifdef SIGTTIN
        signal(SIGTTIN, SIG_IGN);
#endif
#ifdef SIGTSTP
        signal(SIGTSTP, SIG_IGN);
#endif
        
#ifdef TIOCNOTTY
        if ((tty_fd = open("/dev/tty", O_RDWR)) >= 0) {
            ioctl(tty_fd, TIOCNOTTY, (char*) 0);
            close(tty_fd);
        }
#endif
    }

    chdir("/");
    
    if (conf->use_pid_file) {
        if (pa_pid_file_create() < 0) {
            pa_log(__FILE__": pa_pid_file_create() failed.");
#ifdef HAVE_FORK
            if (conf->daemonize)
                pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
#endif
            goto finish;
        }

        valid_pid_file = 1;
    }

#ifdef SIGPIPE
    signal(SIGPIPE, SIG_IGN);
#endif
    
    mainloop = pa_mainloop_new();
    assert(mainloop);

    c = pa_core_new(pa_mainloop_get_api(mainloop));
    assert(c);

    r = pa_signal_init(pa_mainloop_get_api(mainloop));
    assert(r == 0);
    pa_signal_new(SIGINT, signal_callback, c);
    pa_signal_new(SIGTERM, signal_callback, c);

#ifdef SIGUSR1
    pa_signal_new(SIGUSR1, signal_callback, c);
#endif
#ifdef SIGUSR2
    pa_signal_new(SIGUSR2, signal_callback, c);
#endif
#ifdef SIGHUP
    pa_signal_new(SIGHUP, signal_callback, c);
#endif
    
#ifdef OS_IS_WIN32
    timer = pa_mainloop_get_api(mainloop)->time_new(
        pa_mainloop_get_api(mainloop), pa_gettimeofday(&tv), message_cb, NULL);
    assert(timer);
#endif

    if (conf->daemonize)
        c->running_as_daemon = 1;

    oil_init();
    
    r = pa_cpu_limit_init(pa_mainloop_get_api(mainloop));
    assert(r == 0);
    
    buf = pa_strbuf_new();
    if (conf->default_script_file)
        r = pa_cli_command_execute_file(c, conf->default_script_file, buf, &conf->fail);

    if (r >= 0)
        r = pa_cli_command_execute(c, conf->script_commands, buf, &conf->fail);
    pa_log_error("%s", s = pa_strbuf_tostring_free(buf));
    pa_xfree(s);
    
    if (r < 0 && conf->fail) {
        pa_log(__FILE__": failed to initialize daemon.");
#ifdef HAVE_FORK
        if (conf->daemonize)
            pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
#endif
    } else if (!c->modules || pa_idxset_size(c->modules) == 0) {
        pa_log(__FILE__": daemon startup without any loaded modules, refusing to work.");
#ifdef HAVE_FORK
        if (conf->daemonize)
            pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
#endif
    } else {

        retval = 0;
#ifdef HAVE_FORK
        if (conf->daemonize)
            pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
#endif

        c->disallow_module_loading = conf->disallow_module_loading;
        c->exit_idle_time = conf->exit_idle_time;
        c->module_idle_time = conf->module_idle_time;
        c->scache_idle_time = conf->scache_idle_time;
        c->resample_method = conf->resample_method;

        if (c->default_sink_name &&
            pa_namereg_get(c, c->default_sink_name, PA_NAMEREG_SINK, 1) == NULL) {
            pa_log_error("%s : Fatal error. Default sink name (%s) does not exist in name register.", __FILE__, c->default_sink_name);
            retval = 1;
        } else {
            pa_log_info(__FILE__": Daemon startup complete.");
            if (pa_mainloop_run(mainloop, &retval) < 0)
                retval = 1;
            pa_log_info(__FILE__": Daemon shutdown initiated.");
        }
    }

#ifdef OS_IS_WIN32
    pa_mainloop_get_api(mainloop)->time_free(timer);
#endif

    pa_core_free(c);

    pa_cpu_limit_done();
    pa_signal_done();
    pa_mainloop_free(mainloop);
    
    pa_log_info(__FILE__": Daemon terminated.");
    
finish:

    if (conf)
        pa_daemon_conf_free(conf);

    if (valid_pid_file)
        pa_pid_file_remove();
    
    close_pipe(daemon_pipe);

#ifdef OS_IS_WIN32
    WSACleanup();
#endif

    lt_dlexit();
    
    return retval;
}