aboutsummaryrefslogtreecommitdiff
path: root/src/librc/librc-daemon.c
blob: 10bf883a0d5889d290afce53348dfcbe7b05b402 (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
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
/*
 * librc-daemon
 * Finds PID for given daemon criteria
*/

/*
 * Copyright (c) 2007-2015 The OpenRC Authors.
 * See the Authors file at the top-level directory of this distribution and
 * https://github.com/OpenRC/openrc/blob/HEAD/AUTHORS
 *
 * This file is part of OpenRC. It is subject to the license terms in
 * the LICENSE file found in the top-level directory of this
 * distribution and at https://github.com/OpenRC/openrc/blob/HEAD/LICENSE
 * This file may not be copied, modified, propagated, or distributed
 *    except according to the terms contained in the LICENSE file.
 */

#include <errno.h>
#include <dirent.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>

#include "queue.h"
#include "librc.h"
#include "helpers.h"

#if defined(__linux__) || (defined (__FreeBSD_kernel__) && defined(__GLIBC__)) \
	|| defined(__GNU__)
static bool
pid_is_exec(pid_t pid, const char *exec)
{
	char *buffer = NULL;
	FILE *fp;
	int c;
	bool retval = false;

	exec = basename_c(exec);
	xasprintf(&buffer, "/proc/%d/stat", pid);
	if ((fp = fopen(buffer, "r"))) {
		while ((c = getc(fp)) != EOF && c != '(')
			;
		if (c == '(') {
			while ((c = getc(fp)) != EOF && c == *exec)
				exec++;
			if (c == ')' && *exec == '\0')
				retval = true;
		}
		fclose(fp);
	}
	free(buffer);
	return retval;
}

static bool
pid_is_argv(pid_t pid, const char *const *argv)
{
	char *cmdline = NULL;
	int fd;
	char buffer[PATH_MAX];
	char *p;
	ssize_t bytes;

	xasprintf(&cmdline, "/proc/%u/cmdline", pid);
	if ((fd = open(cmdline, O_RDONLY)) < 0) {
		free(cmdline);
		return false;
	}
	bytes = read(fd, buffer, sizeof(buffer) - 1);
	close(fd);
	free(cmdline);
	if (bytes == -1)
		return false;

	buffer[bytes] = '\0';
	p = buffer;
	while (*argv) {
		if (strcmp(*argv, p) != 0)
			return false;
		argv++;
		p += strlen(p) + 1;
		if ((unsigned)(p - buffer) > sizeof(buffer))
			return false;
	}
	return true;
}

RC_PIDLIST *
rc_find_pids(const char *exec, const char *const *argv, uid_t uid, pid_t pid)
{
	DIR *procdir;
	struct dirent *entry;
	FILE *fp;
	int rc;
	bool container_pid = false;
	bool openvz_host = false;
	char *line = NULL;
	char my_ns[30];
	char proc_ns[30];
	size_t len = 0;
	pid_t p;
	char *buffer = NULL;
	struct stat sb;
	pid_t openrc_pid = 0;
	char *pp;
	RC_PIDLIST *pids = NULL;
	RC_PID *pi;

	if ((procdir = opendir("/proc")) == NULL)
		return NULL;

	/*
	  We never match RC_OPENRC_PID if present so we avoid the below
	  scenario

	  /etc/init.d/ntpd stop does
	  start-stop-daemon --stop --name ntpd
	  catching /etc/init.d/ntpd stop

	  nasty
	*/

	if ((pp = getenv("RC_OPENRC_PID"))) {
		if (sscanf(pp, "%d", &openrc_pid) != 1)
			openrc_pid = 0;
	}

	/*
	If /proc/self/status contains EnvID: 0, then we are an OpenVZ host,
	and we will need to filter out processes that are inside containers
	from our list of pids.
	*/

	if (exists("/proc/self/status")) {
		fp = fopen("/proc/self/status", "r");
		if (fp) {
			while (!feof(fp)) {
				rc_getline(&line, &len, fp);
				if (strncmp(line, "envID:\t0", 8) == 0) {
					openvz_host = true;
					break;
				}
			}
			fclose(fp);
		}
	}

	memset(my_ns, 0, sizeof(my_ns));
	memset(proc_ns, 0, sizeof(proc_ns));
	if (exists("/proc/self/ns/pid")) {
		rc = readlink("/proc/self/ns/pid", my_ns, sizeof(my_ns)-1);
		if (rc <= 0)
			my_ns[0] = '\0';
	}

	while ((entry = readdir(procdir)) != NULL) {
		if (sscanf(entry->d_name, "%d", &p) != 1)
			continue;
		if (openrc_pid != 0 && openrc_pid == p)
			continue;
		if (pid != 0 && pid != p)
			continue;
		xasprintf(&buffer, "/proc/%d/ns/pid", p);
		if (exists(buffer)) {
			rc = readlink(buffer, proc_ns, sizeof(proc_ns)-1);
			if (rc <= 0)
				proc_ns[0] = '\0';
		}
		free(buffer);
		if (pid == 0 && strlen(my_ns) && strlen (proc_ns) && strcmp(my_ns, proc_ns))
			continue;
		if (uid) {
			xasprintf(&buffer, "/proc/%d", p);
			if (stat(buffer, &sb) != 0 || sb.st_uid != uid) {
				free(buffer);
				continue;
			}
			free(buffer);
		}
		if (exec && !pid_is_exec(p, exec))
			continue;
		if (argv &&
		    !pid_is_argv(p, (const char *const *)argv))
			continue;
		/* If this is an OpenVZ host, filter out container processes */
		if (openvz_host) {
			xasprintf(&buffer, "/proc/%d/status", p);
			if (exists(buffer)) {
				fp = fopen(buffer, "r");
				free(buffer);
				if (!fp)
					continue;
				while (!feof(fp)) {
					rc_getline(&line, &len, fp);
					if (strncmp(line, "envID:", 6) == 0) {
						container_pid = !(strncmp(line, "envID:\t0", 8) == 0);
						break;
					}
				}
				fclose(fp);
			}
		}
		if (container_pid)
			continue;
		if (!pids) {
			pids = xmalloc(sizeof(*pids));
			LIST_INIT(pids);
		}
		pi = xmalloc(sizeof(*pi));
		pi->pid = p;
		LIST_INSERT_HEAD(pids, pi, entries);
	}
	if (line != NULL)
		free(line);
	closedir(procdir);
	return pids;
}

#elif BSD

# if defined(__NetBSD__) || defined(__OpenBSD__)
#  define _KVM_GETPROC2
#  define _KINFO_PROC kinfo_proc2
#  define _KVM_GETARGV kvm_getargv2
#  define _GET_KINFO_UID(kp) (kp.p_ruid)
#  define _GET_KINFO_COMM(kp) (kp.p_comm)
#  define _GET_KINFO_PID(kp) (kp.p_pid)
#  define _KVM_PATH NULL
#  define _KVM_FLAGS KVM_NO_FILES
# else
#  ifndef KERN_PROC_PROC
#    define KERN_PROC_PROC KERN_PROC_ALL
#  endif
#  define _KINFO_PROC kinfo_proc
#  define _KVM_GETARGV kvm_getargv
#  if defined(__DragonFly__)
#    define _GET_KINFO_UID(kp) (kp.kp_ruid)
#    define _GET_KINFO_COMM(kp) (kp.kp_comm)
#    define _GET_KINFO_PID(kp) (kp.kp_pid)
#  else
#    define _GET_KINFO_UID(kp) (kp.ki_ruid)
#    define _GET_KINFO_COMM(kp) (kp.ki_comm)
#    define _GET_KINFO_PID(kp) (kp.ki_pid)
#  endif
#  define _KVM_PATH _PATH_DEVNULL
#  define _KVM_FLAGS O_RDONLY
# endif

RC_PIDLIST *
rc_find_pids(const char *exec, const char *const *argv, uid_t uid, pid_t pid)
{
	static kvm_t *kd = NULL;
	char errbuf[_POSIX2_LINE_MAX];
	struct _KINFO_PROC *kp;
	int i;
	int processes = 0;
	int pargc = 0;
	char **pargv;
	RC_PIDLIST *pids = NULL;
	RC_PID *pi;
	pid_t p;
	const char *const *arg;
	int match;

	if ((kd = kvm_openfiles(_KVM_PATH, _KVM_PATH,
		    NULL, _KVM_FLAGS, errbuf)) == NULL)
	{
		fprintf(stderr, "kvm_open: %s\n", errbuf);
		return NULL;
	}

#ifdef _KVM_GETPROC2
	kp = kvm_getproc2(kd, KERN_PROC_ALL, 0, sizeof(*kp), &processes);
#else
	kp = kvm_getprocs(kd, KERN_PROC_PROC, 0, &processes);
#endif
	if ((kp == NULL && processes > 0) || (kp != NULL && processes < 0)) {
		fprintf(stderr, "kvm_getprocs: %s\n", kvm_geterr(kd));
		kvm_close(kd);
		return NULL;
	}

	if (exec)
		exec = basename_c(exec);
	for (i = 0; i < processes; i++) {
		p = _GET_KINFO_PID(kp[i]);
		if (pid != 0 && pid != p)
			continue;
		if (uid != 0 && uid != _GET_KINFO_UID(kp[i]))
			continue;
		if (exec) {
			if (!_GET_KINFO_COMM(kp[i]) ||
			    strcmp(exec, _GET_KINFO_COMM(kp[i])) != 0)
				continue;
		}
		if (argv && *argv) {
			pargv = _KVM_GETARGV(kd, &kp[i], pargc);
			if (!pargv || !*pargv)
				continue;
			arg = argv;
			match = 1;
			while (*arg && *pargv)
				if (strcmp(*arg++, *pargv++) != 0) {
					match = 0;
					break;
				}
			if (!match)
				continue;
		}
		if (!pids) {
			pids = xmalloc(sizeof(*pids));
			LIST_INIT(pids);
		}
		pi = xmalloc(sizeof(*pi));
		pi->pid = p;
		LIST_INSERT_HEAD(pids, pi, entries);
	}
	kvm_close(kd);

	return pids;
}

#else
#  error "Platform not supported!"
#endif

static bool
_match_daemon(const char *path, const char *file, RC_STRINGLIST *match)
{
	char *line = NULL;
	size_t len = 0;
	char *ffile = NULL;
	FILE *fp;
	RC_STRING *m;

	xasprintf(&ffile, "%s/%s", path, file);
	fp = fopen(ffile, "r");
	free(ffile);

	if (!fp)
		return false;

	while ((rc_getline(&line, &len, fp))) {
		TAILQ_FOREACH(m, match, entries)
		    if (strcmp(line, m->value) == 0) {
			    TAILQ_REMOVE(match, m, entries);
			    break;
		    }
		if (!TAILQ_FIRST(match))
			break;
	}
	fclose(fp);
	free(line);
	if (TAILQ_FIRST(match))
		return false;
	return true;
}

static RC_STRINGLIST *
_match_list(const char *exec, const char *const *argv, const char *pidfile)
{
	RC_STRINGLIST *match = rc_stringlist_new();
	int i = 0;
	char *m;

	if (exec) {
		xasprintf(&m, "exec=%s", exec);
		rc_stringlist_add(match, m);
		free(m);
	}

	while (argv && argv[i]) {
		xasprintf(&m, "argv_0=%s", argv[i++]);
		rc_stringlist_add(match, m);
		free(m);
	}

	if (pidfile) {
		xasprintf(&m, "pidfile=%s", pidfile);
		rc_stringlist_add(match, m);
		free(m);
	}

	return match;
}

bool
rc_service_daemon_set(const char *service, const char *exec,
    const char *const *argv,
    const char *pidfile, bool started)
{
	char *dirpath = NULL;
	char *file = NULL;
	int nfiles = 0;
	char oldfile[PATH_MAX] = { '\0' };
	bool retval = false;
	DIR *dp;
	struct dirent *d;
	RC_STRINGLIST *match;
	int i = 0;
	FILE *fp;
	char *svcdir = RC_SVCDIR;
#ifdef RC_USER_SERVICES
	if (rc_is_user()) {
		svcdir = rc_user_svcdir();
	}
#endif


	if (!exec && !pidfile) {
		errno = EINVAL;
		return false;
	}

	xasprintf(&dirpath, "%s/daemons/%s", svcdir, basename_c(service));

#ifdef RC_USER_SERVICES
	if (rc_is_user()) {
		free(svcdir);
	}
#endif

	/* Regardless, erase any existing daemon info */
	if ((dp = opendir(dirpath))) {
		match = _match_list(exec, argv, pidfile);
		while ((d = readdir(dp))) {
			if (d->d_name[0] == '.')
				continue;

			xasprintf(&file, "%s/%s", dirpath, d->d_name);
			nfiles++;

			if (!*oldfile) {
				if (_match_daemon(dirpath, d->d_name, match)) {
					unlink(file);
					strlcpy(oldfile, file, sizeof(oldfile));
					nfiles--;
				}
			} else {
				rename(file, oldfile);
				strlcpy(oldfile, file, sizeof(oldfile));
			}
			free(file);
		}
		closedir(dp);
		rc_stringlist_free(match);
	}

	/* Now store our daemon info */
	if (started) {
		if (mkdir(dirpath, 0755) == 0 || errno == EEXIST) {
			xasprintf(&file, "%s/%03d", dirpath, nfiles + 1);
			if ((fp = fopen(file, "w"))) {
				fprintf(fp, "exec=");
				if (exec)
					fprintf(fp, "%s", exec);
				while (argv && argv[i]) {
					fprintf(fp, "\nargv_%d=%s", i, argv[i]);
					i++;
				}
				fprintf(fp, "\npidfile=");
				if (pidfile)
					fprintf(fp, "%s", pidfile);
				fprintf(fp, "\n");
				fclose(fp);
				retval = true;
			}
			free(file);
		}
	} else
		retval = true;

	free(dirpath);
	return retval;
}

bool
rc_service_started_daemon(const char *service,
    const char *exec, const char *const *argv, int indx)
{
	char *dirpath = NULL;
	char *file = NULL;
	RC_STRINGLIST *match;
	bool retval = false;
	DIR *dp;
	struct dirent *d;
	char *svcdir = RC_SVCDIR;
#ifdef RC_USER_SERVICES
	if (rc_is_user()) {
		svcdir = rc_user_svcdir();
	}
#endif

	if (!service || !exec)
		return false;

	xasprintf(&dirpath, "%s/daemons/%s", svcdir, basename_c(service));
	match = _match_list(exec, argv, NULL);

#ifdef RC_USER_SERVICES
	if (rc_is_user()) {
		free(svcdir);
	}
#endif

	if (indx > 0) {
		xasprintf(&file, "%03d", indx);
		retval = _match_daemon(dirpath, file, match);
		free(file);
	} else {
		if ((dp = opendir(dirpath))) {
			while ((d = readdir(dp))) {
				if (d->d_name[0] == '.')
					continue;
				retval = _match_daemon(dirpath, d->d_name, match);
				if (retval)
					break;
			}
			closedir(dp);
		}
	}

	rc_stringlist_free(match);
	free(dirpath);
	return retval;
}

bool
rc_service_daemons_crashed(const char *service)
{
	char dirpath[PATH_MAX];
	DIR *dp;
	struct dirent *d;
	char *path = dirpath;
	FILE *fp;
	char *line = NULL;
	size_t len = 0;
	char **argv = NULL;
	char *exec = NULL;
	char *name = NULL;
	char *pidfile = NULL;
	pid_t pid = 0;
	RC_PIDLIST *pids;
	RC_PID *p1;
	RC_PID *p2;
	char *p;
	char *token;
	bool retval = false;
	RC_STRINGLIST *list = NULL;
	RC_STRING *s;
	size_t i;
	char *ch_root;
	char *spidfile;
	char *svcdir = RC_SVCDIR;
#ifdef RC_USER_SERVICES
	if (rc_is_user()) {
		svcdir = rc_user_svcdir();
	}
#endif

	path += snprintf(dirpath, sizeof(dirpath), "%s/daemons/%s",
	    svcdir, basename_c(service));

#ifdef RC_USER_SERVICES
	if (rc_is_user()) {
		free(svcdir);
	}
#endif

	if (!(dp = opendir(dirpath)))
		return false;

	while ((d = readdir(dp))) {
		if (d->d_name[0] == '.')
			continue;

		snprintf(path, sizeof(dirpath) - (path - dirpath), "/%s",
		    d->d_name);
		fp = fopen(dirpath, "r");
		if (!fp)
			break;

		while ((rc_getline(&line, &len, fp))) {
			p = line;
			if ((token = strsep(&p, "=")) == NULL || !p)
				continue;

			if (!*p)
				continue;

			if (strcmp(token, "exec") == 0) {
				if (exec)
					free(exec);
				exec = xstrdup(p);
			} else if (strncmp(token, "argv_", 5) == 0) {
				if (!list)
					list = rc_stringlist_new();
				rc_stringlist_add(list, p);
			} else if (strcmp(token, "name") == 0) {
				if (name)
					free(name);
				name = xstrdup(p);
			} else if (strcmp(token, "pidfile") == 0) {
				pidfile = xstrdup(p);
				break;
			}
		}
		fclose(fp);

		ch_root = rc_service_value_get(basename_c(service), "chroot");
		spidfile = pidfile;
		if (ch_root && pidfile) {
			spidfile = xmalloc(strlen(ch_root) + strlen(pidfile) + 1);
			strcpy(spidfile, ch_root);
			strcat(spidfile, pidfile);
			free(pidfile);
			pidfile = spidfile;
		}

		pid = 0;
		if (pidfile) {
			retval = true;
			if ((fp = fopen(pidfile, "r"))) {
				if (fscanf(fp, "%d", &pid) == 1)
					retval = false;
				fclose(fp);
			}
			free(pidfile);
			pidfile = NULL;

			/* We have the pid, so no need to match
			   on exec or name */
			free(exec);
			exec = NULL;
			free(name);
			name = NULL;
		} else {
			if (exec) {
				if (!list)
					list = rc_stringlist_new();
				if (!TAILQ_FIRST(list))
					rc_stringlist_add(list, exec);

				free(exec);
				exec = NULL;
			}

			if (list) {
				/* We need to flatten our linked list
				   into an array */
				i = 0;
				TAILQ_FOREACH(s, list, entries)
				    i++;
				argv = xmalloc(sizeof(char *) * (i + 1));
				i = 0;
				TAILQ_FOREACH(s, list, entries)
				    argv[i++] = s->value;
				argv[i] = NULL;
			}
		}

		if (!retval) {
			if (pid != 0) {
				if (kill(pid, 0) == -1 && errno == ESRCH)
					retval = true;
			} else if ((pids = rc_find_pids(exec,
				    (const char *const *)argv,
				    0, pid)))
			{
				p1 = LIST_FIRST(pids);
				while (p1) {
					p2 = LIST_NEXT(p1, entries);
					free(p1);
					p1 = p2;
				}
				free(pids);
			} else
				retval = true;
		}
		rc_stringlist_free(list);
		list = NULL;
		free(argv);
		argv = NULL;
		free(exec);
		exec = NULL;
		free(name);
		name = NULL;
		if (retval)
			break;
	}
	closedir(dp);
	free(line);

	return retval;
}