14da86247c7087f476bcfa6435c81fa006c24eee
[project/procd.git] / service / instance.c
1 /*
2 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by the Free Software Foundation
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15 #define _GNU_SOURCE
16 #include <sys/resource.h>
17 #include <sys/types.h>
18 #include <sys/socket.h>
19 #include <sys/stat.h>
20 #include <grp.h>
21 #include <net/if.h>
22 #include <unistd.h>
23 #include <stdint.h>
24 #include <stdio.h>
25 #include <fcntl.h>
26 #include <pwd.h>
27 #include <libgen.h>
28 #include <unistd.h>
29 #define SYSLOG_NAMES
30 #include <syslog.h>
31
32 #include <libubox/md5.h>
33
34 #include "../procd.h"
35
36 #include "service.h"
37 #include "instance.h"
38
39
40 enum {
41 INSTANCE_ATTR_COMMAND,
42 INSTANCE_ATTR_ENV,
43 INSTANCE_ATTR_DATA,
44 INSTANCE_ATTR_NETDEV,
45 INSTANCE_ATTR_FILE,
46 INSTANCE_ATTR_TRIGGER,
47 INSTANCE_ATTR_RESPAWN,
48 INSTANCE_ATTR_NICE,
49 INSTANCE_ATTR_LIMITS,
50 INSTANCE_ATTR_WATCH,
51 INSTANCE_ATTR_ERROR,
52 INSTANCE_ATTR_USER,
53 INSTANCE_ATTR_GROUP,
54 INSTANCE_ATTR_STDOUT,
55 INSTANCE_ATTR_STDERR,
56 INSTANCE_ATTR_NO_NEW_PRIVS,
57 INSTANCE_ATTR_JAIL,
58 INSTANCE_ATTR_TRACE,
59 INSTANCE_ATTR_SECCOMP,
60 INSTANCE_ATTR_PIDFILE,
61 INSTANCE_ATTR_RELOADSIG,
62 INSTANCE_ATTR_TERMTIMEOUT,
63 INSTANCE_ATTR_FACILITY,
64 __INSTANCE_ATTR_MAX
65 };
66
67 static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = {
68 [INSTANCE_ATTR_COMMAND] = { "command", BLOBMSG_TYPE_ARRAY },
69 [INSTANCE_ATTR_ENV] = { "env", BLOBMSG_TYPE_TABLE },
70 [INSTANCE_ATTR_DATA] = { "data", BLOBMSG_TYPE_TABLE },
71 [INSTANCE_ATTR_NETDEV] = { "netdev", BLOBMSG_TYPE_ARRAY },
72 [INSTANCE_ATTR_FILE] = { "file", BLOBMSG_TYPE_ARRAY },
73 [INSTANCE_ATTR_TRIGGER] = { "triggers", BLOBMSG_TYPE_ARRAY },
74 [INSTANCE_ATTR_RESPAWN] = { "respawn", BLOBMSG_TYPE_ARRAY },
75 [INSTANCE_ATTR_NICE] = { "nice", BLOBMSG_TYPE_INT32 },
76 [INSTANCE_ATTR_LIMITS] = { "limits", BLOBMSG_TYPE_TABLE },
77 [INSTANCE_ATTR_WATCH] = { "watch", BLOBMSG_TYPE_ARRAY },
78 [INSTANCE_ATTR_ERROR] = { "error", BLOBMSG_TYPE_ARRAY },
79 [INSTANCE_ATTR_USER] = { "user", BLOBMSG_TYPE_STRING },
80 [INSTANCE_ATTR_GROUP] = { "group", BLOBMSG_TYPE_STRING },
81 [INSTANCE_ATTR_STDOUT] = { "stdout", BLOBMSG_TYPE_BOOL },
82 [INSTANCE_ATTR_STDERR] = { "stderr", BLOBMSG_TYPE_BOOL },
83 [INSTANCE_ATTR_NO_NEW_PRIVS] = { "no_new_privs", BLOBMSG_TYPE_BOOL },
84 [INSTANCE_ATTR_JAIL] = { "jail", BLOBMSG_TYPE_TABLE },
85 [INSTANCE_ATTR_TRACE] = { "trace", BLOBMSG_TYPE_BOOL },
86 [INSTANCE_ATTR_SECCOMP] = { "seccomp", BLOBMSG_TYPE_STRING },
87 [INSTANCE_ATTR_PIDFILE] = { "pidfile", BLOBMSG_TYPE_STRING },
88 [INSTANCE_ATTR_RELOADSIG] = { "reload_signal", BLOBMSG_TYPE_INT32 },
89 [INSTANCE_ATTR_TERMTIMEOUT] = { "term_timeout", BLOBMSG_TYPE_INT32 },
90 [INSTANCE_ATTR_FACILITY] = { "facility", BLOBMSG_TYPE_STRING },
91 };
92
93 enum {
94 JAIL_ATTR_NAME,
95 JAIL_ATTR_HOSTNAME,
96 JAIL_ATTR_PROCFS,
97 JAIL_ATTR_SYSFS,
98 JAIL_ATTR_UBUS,
99 JAIL_ATTR_LOG,
100 JAIL_ATTR_RONLY,
101 JAIL_ATTR_MOUNT,
102 __JAIL_ATTR_MAX,
103 };
104
105 static const struct blobmsg_policy jail_attr[__JAIL_ATTR_MAX] = {
106 [JAIL_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
107 [JAIL_ATTR_HOSTNAME] = { "hostname", BLOBMSG_TYPE_STRING },
108 [JAIL_ATTR_PROCFS] = { "procfs", BLOBMSG_TYPE_BOOL },
109 [JAIL_ATTR_SYSFS] = { "sysfs", BLOBMSG_TYPE_BOOL },
110 [JAIL_ATTR_UBUS] = { "ubus", BLOBMSG_TYPE_BOOL },
111 [JAIL_ATTR_LOG] = { "log", BLOBMSG_TYPE_BOOL },
112 [JAIL_ATTR_RONLY] = { "ronly", BLOBMSG_TYPE_BOOL },
113 [JAIL_ATTR_MOUNT] = { "mount", BLOBMSG_TYPE_TABLE },
114 };
115
116 struct instance_netdev {
117 struct blobmsg_list_node node;
118 int ifindex;
119 };
120
121 struct instance_file {
122 struct blobmsg_list_node node;
123 uint32_t md5[4];
124 };
125
126 struct rlimit_name {
127 const char *name;
128 int resource;
129 };
130
131 static const struct rlimit_name rlimit_names[] = {
132 { "as", RLIMIT_AS },
133 { "core", RLIMIT_CORE },
134 { "cpu", RLIMIT_CPU },
135 { "data", RLIMIT_DATA },
136 { "fsize", RLIMIT_FSIZE },
137 { "memlock", RLIMIT_MEMLOCK },
138 { "nofile", RLIMIT_NOFILE },
139 { "nproc", RLIMIT_NPROC },
140 { "rss", RLIMIT_RSS },
141 { "stack", RLIMIT_STACK },
142 #ifdef linux
143 { "nice", RLIMIT_NICE },
144 { "rtprio", RLIMIT_RTPRIO },
145 { "msgqueue", RLIMIT_MSGQUEUE },
146 { "sigpending", RLIMIT_SIGPENDING },
147 #endif
148 { NULL, 0 }
149 };
150
151 static void closefd(int fd)
152 {
153 if (fd > STDERR_FILENO)
154 close(fd);
155 }
156
157 /* convert a string into numeric syslog facility or return -1 if no match found */
158 static int
159 syslog_facility_str_to_int(const char *facility)
160 {
161 CODE *p = facilitynames;
162
163 while (p->c_name && strcasecmp(p->c_name, facility))
164 p++;
165
166 return p->c_val;
167 }
168
169 static void
170 instance_limits(const char *limit, const char *value)
171 {
172 int i;
173 struct rlimit rlim;
174 unsigned long cur, max;
175
176 for (i = 0; rlimit_names[i].name != NULL; i++) {
177 if (strcmp(rlimit_names[i].name, limit))
178 continue;
179 if (!strcmp(value, "unlimited")) {
180 rlim.rlim_cur = RLIM_INFINITY;
181 rlim.rlim_max = RLIM_INFINITY;
182 } else {
183 if (getrlimit(rlimit_names[i].resource, &rlim))
184 return;
185
186 cur = rlim.rlim_cur;
187 max = rlim.rlim_max;
188
189 if (sscanf(value, "%lu %lu", &cur, &max) < 1)
190 return;
191
192 rlim.rlim_cur = cur;
193 rlim.rlim_max = max;
194 }
195
196 setrlimit(rlimit_names[i].resource, &rlim);
197 return;
198 }
199 }
200
201 static inline int
202 jail_run(struct service_instance *in, char **argv)
203 {
204 struct blobmsg_list_node *var;
205 struct jail *jail = &in->jail;
206 int argc = 0;
207
208 argv[argc++] = "/sbin/ujail";
209
210 if (jail->name) {
211 argv[argc++] = "-n";
212 argv[argc++] = jail->name;
213 }
214
215 if (jail->hostname) {
216 argv[argc++] = "-h";
217 argv[argc++] = jail->hostname;
218 }
219
220 if (in->seccomp) {
221 argv[argc++] = "-S";
222 argv[argc++] = in->seccomp;
223 }
224
225 if (in->user) {
226 argv[argc++] = "-U";
227 argv[argc++] = in->user;
228 }
229
230 if (in->group) {
231 argv[argc++] = "-G";
232 argv[argc++] = in->group;
233 }
234
235 if (in->no_new_privs)
236 argv[argc++] = "-c";
237
238 if (jail->procfs)
239 argv[argc++] = "-p";
240
241 if (jail->sysfs)
242 argv[argc++] = "-s";
243
244 if (jail->ubus)
245 argv[argc++] = "-u";
246
247 if (jail->log)
248 argv[argc++] = "-l";
249
250 if (jail->ronly)
251 argv[argc++] = "-o";
252
253 blobmsg_list_for_each(&jail->mount, var) {
254 const char *type = blobmsg_data(var->data);
255
256 if (*type == '1')
257 argv[argc++] = "-w";
258 else
259 argv[argc++] = "-r";
260 argv[argc++] = (char *) blobmsg_name(var->data);
261 }
262
263 argv[argc++] = "--";
264
265 return argc;
266 }
267
268 static int
269 instance_removepid(struct service_instance *in) {
270 if (!in->pidfile)
271 return 0;
272 if (unlink(in->pidfile)) {
273 ERROR("Failed to remove pidfile: %s: %m\n", in->pidfile);
274 return 1;
275 }
276 return 0;
277 }
278
279 static int
280 instance_writepid(struct service_instance *in)
281 {
282 FILE *_pidfile;
283
284 if (!in->pidfile) {
285 return 0;
286 }
287 _pidfile = fopen(in->pidfile, "w");
288 if (_pidfile == NULL) {
289 ERROR("failed to open pidfile for writing: %s: %m", in->pidfile);
290 return 1;
291 }
292 if (fprintf(_pidfile, "%d\n", in->proc.pid) < 0) {
293 ERROR("failed to write pidfile: %s: %m", in->pidfile);
294 fclose(_pidfile);
295 return 2;
296 }
297 if (fclose(_pidfile)) {
298 ERROR("failed to close pidfile: %s: %m", in->pidfile);
299 return 3;
300 }
301
302 return 0;
303 }
304
305 static void
306 instance_run(struct service_instance *in, int _stdout, int _stderr)
307 {
308 struct blobmsg_list_node *var;
309 struct blob_attr *cur;
310 char **argv;
311 int argc = 1; /* NULL terminated */
312 int rem, _stdin;
313 bool seccomp = !in->trace && !in->has_jail && in->seccomp;
314 bool setlbf = _stdout >= 0;
315
316 if (in->nice)
317 setpriority(PRIO_PROCESS, 0, in->nice);
318
319 blobmsg_for_each_attr(cur, in->command, rem)
320 argc++;
321
322 blobmsg_list_for_each(&in->env, var)
323 setenv(blobmsg_name(var->data), blobmsg_data(var->data), 1);
324
325 if (seccomp)
326 setenv("SECCOMP_FILE", in->seccomp, 1);
327
328 if (setlbf)
329 setenv("LD_PRELOAD", "/lib/libsetlbf.so", 1);
330
331 blobmsg_list_for_each(&in->limits, var)
332 instance_limits(blobmsg_name(var->data), blobmsg_data(var->data));
333
334 if (in->trace || seccomp)
335 argc += 1;
336
337 argv = alloca(sizeof(char *) * (argc + in->jail.argc));
338 argc = 0;
339
340 #ifdef SECCOMP_SUPPORT
341 if (in->trace)
342 argv[argc++] = "/sbin/utrace";
343 else if (seccomp)
344 argv[argc++] = "/sbin/seccomp-trace";
345 #else
346 if (in->trace || seccomp)
347 ULOG_WARN("Seccomp support for %s::%s not available\n", in->srv->name, in->name);
348 #endif
349
350 if (in->has_jail) {
351 argc = jail_run(in, argv);
352 if (argc != in->jail.argc)
353 ULOG_WARN("expected %i jail params, used %i for %s::%s\n",
354 in->jail.argc, argc, in->srv->name, in->name);
355 }
356
357 blobmsg_for_each_attr(cur, in->command, rem)
358 argv[argc++] = blobmsg_data(cur);
359
360 argv[argc] = NULL;
361
362 _stdin = open("/dev/null", O_RDONLY);
363
364 if (_stdout == -1)
365 _stdout = open("/dev/null", O_WRONLY);
366
367 if (_stderr == -1)
368 _stderr = open("/dev/null", O_WRONLY);
369
370 if (_stdin > -1) {
371 dup2(_stdin, STDIN_FILENO);
372 closefd(_stdin);
373 }
374 if (_stdout > -1) {
375 dup2(_stdout, STDOUT_FILENO);
376 closefd(_stdout);
377 }
378 if (_stderr > -1) {
379 dup2(_stderr, STDERR_FILENO);
380 closefd(_stderr);
381 }
382
383 if (!in->has_jail && in->user && in->pw_gid && initgroups(in->user, in->pw_gid)) {
384 ERROR("failed to initgroups() for user %s: %m\n", in->user);
385 exit(127);
386 }
387 if (!in->has_jail && in->gr_gid && setgid(in->gr_gid)) {
388 ERROR("failed to set group id %d: %m\n", in->gr_gid);
389 exit(127);
390 }
391 if (!in->has_jail && in->uid && setuid(in->uid)) {
392 ERROR("failed to set user id %d: %m\n", in->uid);
393 exit(127);
394 }
395
396 execvp(argv[0], argv);
397 exit(127);
398 }
399
400 static void
401 instance_free_stdio(struct service_instance *in)
402 {
403 if (in->_stdout.fd.fd > -1) {
404 ustream_free(&in->_stdout.stream);
405 close(in->_stdout.fd.fd);
406 in->_stdout.fd.fd = -1;
407 }
408
409 if (in->_stderr.fd.fd > -1) {
410 ustream_free(&in->_stderr.stream);
411 close(in->_stderr.fd.fd);
412 in->_stderr.fd.fd = -1;
413 }
414 }
415
416 void
417 instance_start(struct service_instance *in)
418 {
419 int pid;
420 int opipe[2] = { -1, -1 };
421 int epipe[2] = { -1, -1 };
422
423 if (!avl_is_empty(&in->errors.avl)) {
424 LOG("Not starting instance %s::%s, an error was indicated\n", in->srv->name, in->name);
425 return;
426 }
427
428 if (!in->command) {
429 LOG("Not starting instance %s::%s, command not set\n", in->srv->name, in->name);
430 return;
431 }
432
433 if (in->proc.pending) {
434 if (in->halt)
435 in->restart = true;
436 return;
437 }
438
439 instance_free_stdio(in);
440 if (in->_stdout.fd.fd > -2) {
441 if (pipe(opipe)) {
442 ULOG_WARN("pipe() failed: %m\n");
443 opipe[0] = opipe[1] = -1;
444 }
445 }
446
447 if (in->_stderr.fd.fd > -2) {
448 if (pipe(epipe)) {
449 ULOG_WARN("pipe() failed: %m\n");
450 epipe[0] = epipe[1] = -1;
451 }
452 }
453
454 in->restart = false;
455 in->halt = false;
456
457 if (!in->valid)
458 return;
459
460 pid = fork();
461 if (pid < 0)
462 return;
463
464 if (!pid) {
465 uloop_done();
466 closefd(opipe[0]);
467 closefd(epipe[0]);
468 instance_run(in, opipe[1], epipe[1]);
469 return;
470 }
471
472 DEBUG(2, "Started instance %s::%s[%d]\n", in->srv->name, in->name, pid);
473 in->proc.pid = pid;
474 instance_writepid(in);
475 clock_gettime(CLOCK_MONOTONIC, &in->start);
476 uloop_process_add(&in->proc);
477
478 if (opipe[0] > -1) {
479 ustream_fd_init(&in->_stdout, opipe[0]);
480 closefd(opipe[1]);
481 fcntl(opipe[0], F_SETFD, FD_CLOEXEC);
482 }
483
484 if (epipe[0] > -1) {
485 ustream_fd_init(&in->_stderr, epipe[0]);
486 closefd(epipe[1]);
487 fcntl(epipe[0], F_SETFD, FD_CLOEXEC);
488 }
489
490 service_event("instance.start", in->srv->name, in->name);
491 }
492
493 static void
494 instance_stdio(struct ustream *s, int prio, struct service_instance *in)
495 {
496 char *newline, *str, *arg0, ident[32];
497 int len;
498
499 arg0 = basename(blobmsg_data(blobmsg_data(in->command)));
500 snprintf(ident, sizeof(ident), "%s[%d]", arg0, in->proc.pid);
501 ulog_open(ULOG_SYSLOG, in->syslog_facility, ident);
502
503 do {
504 str = ustream_get_read_buf(s, &len);
505 if (!str)
506 break;
507
508 newline = memchr(str, '\n', len);
509 if (!newline && (s->r.buffer_len != len))
510 break;
511
512 if (newline) {
513 *newline = 0;
514 len = newline + 1 - str;
515 }
516 ulog(prio, "%s\n", str);
517
518 ustream_consume(s, len);
519 } while (1);
520
521 ulog_open(ULOG_SYSLOG, LOG_DAEMON, "procd");
522 }
523
524 static void
525 instance_stdout(struct ustream *s, int bytes)
526 {
527 instance_stdio(s, LOG_INFO,
528 container_of(s, struct service_instance, _stdout.stream));
529 }
530
531 static void
532 instance_stderr(struct ustream *s, int bytes)
533 {
534 instance_stdio(s, LOG_ERR,
535 container_of(s, struct service_instance, _stderr.stream));
536 }
537
538 static void
539 instance_timeout(struct uloop_timeout *t)
540 {
541 struct service_instance *in;
542
543 in = container_of(t, struct service_instance, timeout);
544
545 if (in->halt) {
546 LOG("Instance %s::%s pid %d not stopped on SIGTERM, sending SIGKILL instead\n",
547 in->srv->name, in->name, in->proc.pid);
548 kill(in->proc.pid, SIGKILL);
549 } else if (in->restart || in->respawn)
550 instance_start(in);
551 }
552
553 static void
554 instance_delete(struct service_instance *in)
555 {
556 struct service *s = in->srv;
557
558 avl_delete(&s->instances.avl, &in->node.avl);
559 instance_free(in);
560 service_stopped(s);
561 }
562
563 static void
564 instance_exit(struct uloop_process *p, int ret)
565 {
566 struct service_instance *in;
567 struct timespec tp;
568 long runtime;
569
570 in = container_of(p, struct service_instance, proc);
571
572 clock_gettime(CLOCK_MONOTONIC, &tp);
573 runtime = tp.tv_sec - in->start.tv_sec;
574
575 DEBUG(2, "Instance %s::%s exit with error code %d after %ld seconds\n", in->srv->name, in->name, ret, runtime);
576
577 uloop_timeout_cancel(&in->timeout);
578 service_event("instance.stop", in->srv->name, in->name);
579
580 if (in->halt) {
581 instance_removepid(in);
582 if (in->restart)
583 instance_start(in);
584 else
585 instance_delete(in);
586 } else if (in->restart) {
587 instance_start(in);
588 } else if (in->respawn) {
589 if (runtime < in->respawn_threshold)
590 in->respawn_count++;
591 else
592 in->respawn_count = 0;
593 if (in->respawn_count > in->respawn_retry && in->respawn_retry > 0 ) {
594 LOG("Instance %s::%s s in a crash loop %d crashes, %ld seconds since last crash\n",
595 in->srv->name, in->name, in->respawn_count, runtime);
596 in->restart = in->respawn = 0;
597 in->halt = 1;
598 service_event("instance.fail", in->srv->name, in->name);
599 } else {
600 service_event("instance.respawn", in->srv->name, in->name);
601 uloop_timeout_set(&in->timeout, in->respawn_timeout * 1000);
602 }
603 }
604 }
605
606 void
607 instance_stop(struct service_instance *in, bool halt)
608 {
609 if (!in->proc.pending) {
610 if (halt)
611 instance_delete(in);
612 return;
613 }
614 in->halt = halt;
615 in->restart = in->respawn = false;
616 kill(in->proc.pid, SIGTERM);
617 uloop_timeout_set(&in->timeout, in->term_timeout * 1000);
618 }
619
620 static void
621 instance_restart(struct service_instance *in)
622 {
623 if (!in->proc.pending)
624 return;
625
626 if (in->reload_signal) {
627 kill(in->proc.pid, in->reload_signal);
628 return;
629 }
630
631 in->halt = true;
632 in->restart = true;
633 kill(in->proc.pid, SIGTERM);
634 uloop_timeout_set(&in->timeout, in->term_timeout * 1000);
635 }
636
637 static bool string_changed(const char *a, const char *b)
638 {
639 return !((!a && !b) || (a && b && !strcmp(a, b)));
640 }
641
642 static bool
643 instance_config_changed(struct service_instance *in, struct service_instance *in_new)
644 {
645 if (!in->valid)
646 return true;
647
648 if (!blob_attr_equal(in->command, in_new->command))
649 return true;
650
651 if (!blobmsg_list_equal(&in->env, &in_new->env))
652 return true;
653
654 if (!blobmsg_list_equal(&in->netdev, &in_new->netdev))
655 return true;
656
657 if (!blobmsg_list_equal(&in->file, &in_new->file))
658 return true;
659
660 if (in->nice != in_new->nice)
661 return true;
662
663 if (in->syslog_facility != in_new->syslog_facility)
664 return true;
665
666 if (string_changed(in->user, in_new->user))
667 return true;
668
669 if (string_changed(in->group, in_new->group))
670 return true;
671
672 if (in->uid != in_new->uid)
673 return true;
674
675 if (in->pw_gid != in_new->pw_gid)
676 return true;
677
678 if (string_changed(in->pidfile, in_new->pidfile))
679 return true;
680
681 if (in->respawn_retry != in_new->respawn_retry)
682 return true;
683 if (in->respawn_threshold != in_new->respawn_threshold)
684 return true;
685 if (in->respawn_timeout != in_new->respawn_timeout)
686 return true;
687
688 if ((!in->seccomp && in_new->seccomp) ||
689 (in->seccomp && !in_new->seccomp) ||
690 (in->seccomp && in_new->seccomp && strcmp(in->seccomp, in_new->seccomp)))
691 return true;
692
693 if (!blobmsg_list_equal(&in->limits, &in_new->limits))
694 return true;
695
696 if (!blobmsg_list_equal(&in->jail.mount, &in_new->jail.mount))
697 return true;
698
699 if (!blobmsg_list_equal(&in->errors, &in_new->errors))
700 return true;
701
702 return false;
703 }
704
705 static bool
706 instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
707 {
708 struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
709 struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
710
711 return n1->ifindex == n2->ifindex;
712 }
713
714 static void
715 instance_netdev_update(struct blobmsg_list_node *l)
716 {
717 struct instance_netdev *n = container_of(l, struct instance_netdev, node);
718
719 n->ifindex = if_nametoindex(n->node.avl.key);
720 }
721
722 static bool
723 instance_file_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
724 {
725 struct instance_file *f1 = container_of(l1, struct instance_file, node);
726 struct instance_file *f2 = container_of(l2, struct instance_file, node);
727
728 return !memcmp(f1->md5, f2->md5, sizeof(f1->md5));
729 }
730
731 static void
732 instance_file_update(struct blobmsg_list_node *l)
733 {
734 struct instance_file *f = container_of(l, struct instance_file, node);
735 md5_ctx_t md5;
736 char buf[256];
737 int len, fd;
738
739 memset(f->md5, 0, sizeof(f->md5));
740
741 fd = open(l->avl.key, O_RDONLY);
742 if (fd < 0)
743 return;
744
745 md5_begin(&md5);
746 do {
747 len = read(fd, buf, sizeof(buf));
748 if (len < 0) {
749 if (errno == EINTR)
750 continue;
751
752 break;
753 }
754 if (!len)
755 break;
756
757 md5_hash(buf, len, &md5);
758 } while(1);
759
760 md5_end(f->md5, &md5);
761 close(fd);
762 }
763
764 static void
765 instance_fill_any(struct blobmsg_list *l, struct blob_attr *cur)
766 {
767 if (!cur)
768 return;
769
770 blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), false);
771 }
772
773 static bool
774 instance_fill_array(struct blobmsg_list *l, struct blob_attr *cur, blobmsg_update_cb cb, bool array)
775 {
776 struct blobmsg_list_node *node;
777
778 if (!cur)
779 return true;
780
781 if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
782 return false;
783
784 blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), array);
785 if (cb) {
786 blobmsg_list_for_each(l, node)
787 cb(node);
788 }
789 return true;
790 }
791
792 static int
793 instance_jail_parse(struct service_instance *in, struct blob_attr *attr)
794 {
795 struct blob_attr *tb[__JAIL_ATTR_MAX];
796 struct jail *jail = &in->jail;
797 struct stat s;
798
799 if (stat("/sbin/ujail", &s))
800 return 0;
801
802 blobmsg_parse(jail_attr, __JAIL_ATTR_MAX, tb,
803 blobmsg_data(attr), blobmsg_data_len(attr));
804
805 jail->argc = 2;
806
807 if (tb[JAIL_ATTR_NAME]) {
808 jail->name = strdup(blobmsg_get_string(tb[JAIL_ATTR_NAME]));
809 jail->argc += 2;
810 }
811 if (tb[JAIL_ATTR_HOSTNAME]) {
812 jail->hostname = strdup(blobmsg_get_string(tb[JAIL_ATTR_HOSTNAME]));
813 jail->argc += 2;
814 }
815 if (tb[JAIL_ATTR_PROCFS]) {
816 jail->procfs = blobmsg_get_bool(tb[JAIL_ATTR_PROCFS]);
817 jail->argc++;
818 }
819 if (tb[JAIL_ATTR_SYSFS]) {
820 jail->sysfs = blobmsg_get_bool(tb[JAIL_ATTR_SYSFS]);
821 jail->argc++;
822 }
823 if (tb[JAIL_ATTR_UBUS]) {
824 jail->ubus = blobmsg_get_bool(tb[JAIL_ATTR_UBUS]);
825 jail->argc++;
826 }
827 if (tb[JAIL_ATTR_LOG]) {
828 jail->log = blobmsg_get_bool(tb[JAIL_ATTR_LOG]);
829 jail->argc++;
830 }
831 if (tb[JAIL_ATTR_RONLY]) {
832 jail->ronly = blobmsg_get_bool(tb[JAIL_ATTR_RONLY]);
833 jail->argc++;
834 }
835 if (tb[JAIL_ATTR_MOUNT]) {
836 struct blob_attr *cur;
837 int rem;
838
839 blobmsg_for_each_attr(cur, tb[JAIL_ATTR_MOUNT], rem)
840 jail->argc += 2;
841 instance_fill_array(&jail->mount, tb[JAIL_ATTR_MOUNT], NULL, false);
842 }
843 if (in->seccomp)
844 jail->argc += 2;
845
846 if (in->user)
847 jail->argc += 2;
848
849 if (in->group)
850 jail->argc += 2;
851
852 if (in->no_new_privs)
853 jail->argc++;
854
855 return 1;
856 }
857
858 static bool
859 instance_config_parse_command(struct service_instance *in, struct blob_attr **tb)
860 {
861 struct blob_attr *cur, *cur2;
862 bool ret = false;
863 int rem;
864
865 cur = tb[INSTANCE_ATTR_COMMAND];
866 if (!cur) {
867 in->command = NULL;
868 return true;
869 }
870
871 if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
872 return false;
873
874 blobmsg_for_each_attr(cur2, cur, rem) {
875 ret = true;
876 break;
877 }
878
879 in->command = cur;
880 return ret;
881 }
882
883 static bool
884 instance_config_parse(struct service_instance *in)
885 {
886 struct blob_attr *tb[__INSTANCE_ATTR_MAX];
887 struct blob_attr *cur, *cur2;
888 int rem;
889
890 blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
891 blobmsg_data(in->config), blobmsg_data_len(in->config));
892
893 if (!instance_config_parse_command(in, tb))
894 return false;
895
896 if (tb[INSTANCE_ATTR_TERMTIMEOUT])
897 in->term_timeout = blobmsg_get_u32(tb[INSTANCE_ATTR_TERMTIMEOUT]);
898 if (tb[INSTANCE_ATTR_RESPAWN]) {
899 int i = 0;
900 uint32_t vals[3] = { 3600, 5, 5};
901
902 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_RESPAWN], rem) {
903 if ((i >= 3) && (blobmsg_type(cur2) == BLOBMSG_TYPE_STRING))
904 continue;
905 vals[i] = atoi(blobmsg_get_string(cur2));
906 i++;
907 }
908 in->respawn = true;
909 in->respawn_count = 0;
910 in->respawn_threshold = vals[0];
911 in->respawn_timeout = vals[1];
912 in->respawn_retry = vals[2];
913 }
914 if (tb[INSTANCE_ATTR_TRIGGER]) {
915 in->trigger = tb[INSTANCE_ATTR_TRIGGER];
916 trigger_add(in->trigger, in);
917 }
918
919 if (tb[INSTANCE_ATTR_WATCH]) {
920 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_WATCH], rem) {
921 if (blobmsg_type(cur2) != BLOBMSG_TYPE_STRING)
922 continue;
923 DEBUG(3, "watch for %s\n", blobmsg_get_string(cur2));
924 watch_add(blobmsg_get_string(cur2), in);
925 }
926 }
927
928 if ((cur = tb[INSTANCE_ATTR_NICE])) {
929 in->nice = (int8_t) blobmsg_get_u32(cur);
930 if (in->nice < -20 || in->nice > 20)
931 return false;
932 }
933
934 if (tb[INSTANCE_ATTR_USER]) {
935 const char *user = blobmsg_get_string(tb[INSTANCE_ATTR_USER]);
936 struct passwd *p = getpwnam(user);
937 if (p) {
938 in->user = strdup(user);
939 in->uid = p->pw_uid;
940 in->gr_gid = in->pw_gid = p->pw_gid;
941 }
942 }
943
944 if (tb[INSTANCE_ATTR_GROUP]) {
945 const char *group = blobmsg_get_string(tb[INSTANCE_ATTR_GROUP]);
946 struct group *p = getgrnam(group);
947 if (p) {
948 in->group = strdup(group);
949 in->gr_gid = p->gr_gid;
950 }
951 }
952
953 if (tb[INSTANCE_ATTR_TRACE])
954 in->trace = blobmsg_get_bool(tb[INSTANCE_ATTR_TRACE]);
955
956 if (tb[INSTANCE_ATTR_NO_NEW_PRIVS])
957 in->no_new_privs = blobmsg_get_bool(tb[INSTANCE_ATTR_NO_NEW_PRIVS]);
958
959 if (!in->trace && tb[INSTANCE_ATTR_SECCOMP])
960 in->seccomp = strdup(blobmsg_get_string(tb[INSTANCE_ATTR_SECCOMP]));
961
962 if (tb[INSTANCE_ATTR_PIDFILE]) {
963 char *pidfile = blobmsg_get_string(tb[INSTANCE_ATTR_PIDFILE]);
964 if (pidfile)
965 in->pidfile = strdup(pidfile);
966 }
967
968 if (tb[INSTANCE_ATTR_RELOADSIG])
969 in->reload_signal = blobmsg_get_u32(tb[INSTANCE_ATTR_RELOADSIG]);
970
971 if (!in->trace && tb[INSTANCE_ATTR_JAIL])
972 in->has_jail = instance_jail_parse(in, tb[INSTANCE_ATTR_JAIL]);
973
974 if (tb[INSTANCE_ATTR_STDOUT] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDOUT]))
975 in->_stdout.fd.fd = -1;
976
977 if (tb[INSTANCE_ATTR_STDERR] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDERR]))
978 in->_stderr.fd.fd = -1;
979
980 instance_fill_any(&in->data, tb[INSTANCE_ATTR_DATA]);
981
982 if (!instance_fill_array(&in->env, tb[INSTANCE_ATTR_ENV], NULL, false))
983 return false;
984
985 if (!instance_fill_array(&in->netdev, tb[INSTANCE_ATTR_NETDEV], instance_netdev_update, true))
986 return false;
987
988 if (!instance_fill_array(&in->file, tb[INSTANCE_ATTR_FILE], instance_file_update, true))
989 return false;
990
991 if (!instance_fill_array(&in->limits, tb[INSTANCE_ATTR_LIMITS], NULL, false))
992 return false;
993
994 if (!instance_fill_array(&in->errors, tb[INSTANCE_ATTR_ERROR], NULL, true))
995 return false;
996
997 if (tb[INSTANCE_ATTR_FACILITY]) {
998 int facility = syslog_facility_str_to_int(blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
999 if (facility != -1) {
1000 in->syslog_facility = facility;
1001 DEBUG(3, "setting facility '%s'\n", blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
1002 } else
1003 DEBUG(3, "unknown syslog facility '%s' given, using default (LOG_DAEMON)\n", blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
1004 }
1005
1006 return true;
1007 }
1008
1009 static void
1010 instance_config_cleanup(struct service_instance *in)
1011 {
1012 blobmsg_list_free(&in->env);
1013 blobmsg_list_free(&in->data);
1014 blobmsg_list_free(&in->netdev);
1015 blobmsg_list_free(&in->file);
1016 blobmsg_list_free(&in->limits);
1017 blobmsg_list_free(&in->errors);
1018 blobmsg_list_free(&in->jail.mount);
1019 }
1020
1021 static void
1022 instance_config_move_strdup(char **dst, char *src)
1023 {
1024 if (*dst) {
1025 free(*dst);
1026 *dst = NULL;
1027 }
1028
1029 if (!src)
1030 return;
1031
1032 *dst = strdup(src);
1033 }
1034
1035 static void
1036 instance_config_move(struct service_instance *in, struct service_instance *in_src)
1037 {
1038 instance_config_cleanup(in);
1039 blobmsg_list_move(&in->env, &in_src->env);
1040 blobmsg_list_move(&in->data, &in_src->data);
1041 blobmsg_list_move(&in->netdev, &in_src->netdev);
1042 blobmsg_list_move(&in->file, &in_src->file);
1043 blobmsg_list_move(&in->limits, &in_src->limits);
1044 blobmsg_list_move(&in->errors, &in_src->errors);
1045 blobmsg_list_move(&in->jail.mount, &in_src->jail.mount);
1046 in->trigger = in_src->trigger;
1047 in->command = in_src->command;
1048 in->respawn = in_src->respawn;
1049 in->respawn_retry = in_src->respawn_retry;
1050 in->respawn_threshold = in_src->respawn_threshold;
1051 in->respawn_timeout = in_src->respawn_timeout;
1052 in->name = in_src->name;
1053 in->trace = in_src->trace;
1054 in->node.avl.key = in_src->node.avl.key;
1055 in->syslog_facility = in_src->syslog_facility;
1056
1057 instance_config_move_strdup(&in->pidfile, in_src->pidfile);
1058 instance_config_move_strdup(&in->seccomp, in_src->seccomp);
1059 instance_config_move_strdup(&in->jail.name, in_src->jail.name);
1060 instance_config_move_strdup(&in->jail.hostname, in_src->jail.hostname);
1061
1062 free(in->config);
1063 in->config = in_src->config;
1064 in_src->config = NULL;
1065 }
1066
1067 void
1068 instance_update(struct service_instance *in, struct service_instance *in_new)
1069 {
1070 bool changed = instance_config_changed(in, in_new);
1071 bool running = in->proc.pending;
1072 bool stopping = in->halt;
1073
1074 if (!running || stopping) {
1075 instance_config_move(in, in_new);
1076 instance_start(in);
1077 } else {
1078 if (changed)
1079 instance_restart(in);
1080 instance_config_move(in, in_new);
1081 /* restart happens in the child callback handler */
1082 }
1083 }
1084
1085 void
1086 instance_free(struct service_instance *in)
1087 {
1088 instance_free_stdio(in);
1089 uloop_process_delete(&in->proc);
1090 uloop_timeout_cancel(&in->timeout);
1091 trigger_del(in);
1092 watch_del(in);
1093 instance_config_cleanup(in);
1094 free(in->config);
1095 free(in->user);
1096 free(in->group);
1097 free(in->jail.name);
1098 free(in->jail.hostname);
1099 free(in->seccomp);
1100 free(in->pidfile);
1101 free(in);
1102 }
1103
1104 void
1105 instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
1106 {
1107 config = blob_memdup(config);
1108 in->srv = s;
1109 in->name = blobmsg_name(config);
1110 in->config = config;
1111 in->timeout.cb = instance_timeout;
1112 in->proc.cb = instance_exit;
1113 in->term_timeout = 5;
1114 in->syslog_facility = LOG_DAEMON;
1115
1116 in->_stdout.fd.fd = -2;
1117 in->_stdout.stream.string_data = true;
1118 in->_stdout.stream.notify_read = instance_stdout;
1119
1120 in->_stderr.fd.fd = -2;
1121 in->_stderr.stream.string_data = true;
1122 in->_stderr.stream.notify_read = instance_stderr;
1123
1124 blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
1125 blobmsg_list_init(&in->file, struct instance_file, node, instance_file_cmp);
1126 blobmsg_list_simple_init(&in->env);
1127 blobmsg_list_simple_init(&in->data);
1128 blobmsg_list_simple_init(&in->limits);
1129 blobmsg_list_simple_init(&in->errors);
1130 blobmsg_list_simple_init(&in->jail.mount);
1131 in->valid = instance_config_parse(in);
1132 }
1133
1134 void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
1135 {
1136 void *i;
1137
1138 if (!in->valid)
1139 return;
1140
1141 i = blobmsg_open_table(b, in->name);
1142 blobmsg_add_u8(b, "running", in->proc.pending);
1143 if (in->proc.pending)
1144 blobmsg_add_u32(b, "pid", in->proc.pid);
1145 if (in->command)
1146 blobmsg_add_blob(b, in->command);
1147 blobmsg_add_u32(b, "term_timeout", in->term_timeout);
1148
1149 if (!avl_is_empty(&in->errors.avl)) {
1150 struct blobmsg_list_node *var;
1151 void *e = blobmsg_open_array(b, "errors");
1152 blobmsg_list_for_each(&in->errors, var)
1153 blobmsg_add_string(b, NULL, blobmsg_data(var->data));
1154 blobmsg_close_table(b, e);
1155 }
1156
1157 if (!avl_is_empty(&in->env.avl)) {
1158 struct blobmsg_list_node *var;
1159 void *e = blobmsg_open_table(b, "env");
1160 blobmsg_list_for_each(&in->env, var)
1161 blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1162 blobmsg_close_table(b, e);
1163 }
1164
1165 if (!avl_is_empty(&in->data.avl)) {
1166 struct blobmsg_list_node *var;
1167 void *e = blobmsg_open_table(b, "data");
1168 blobmsg_list_for_each(&in->data, var)
1169 blobmsg_add_blob(b, var->data);
1170 blobmsg_close_table(b, e);
1171 }
1172
1173 if (!avl_is_empty(&in->limits.avl)) {
1174 struct blobmsg_list_node *var;
1175 void *e = blobmsg_open_table(b, "limits");
1176 blobmsg_list_for_each(&in->limits, var)
1177 blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1178 blobmsg_close_table(b, e);
1179 }
1180
1181 if (in->reload_signal)
1182 blobmsg_add_u32(b, "reload_signal", in->reload_signal);
1183
1184 if (in->respawn) {
1185 void *r = blobmsg_open_table(b, "respawn");
1186 blobmsg_add_u32(b, "threshold", in->respawn_threshold);
1187 blobmsg_add_u32(b, "timeout", in->respawn_timeout);
1188 blobmsg_add_u32(b, "retry", in->respawn_retry);
1189 blobmsg_close_table(b, r);
1190 }
1191
1192 if (in->trace)
1193 blobmsg_add_u8(b, "trace", true);
1194
1195 if (in->no_new_privs)
1196 blobmsg_add_u8(b, "no_new_privs", true);
1197
1198 if (in->seccomp)
1199 blobmsg_add_string(b, "seccomp", in->seccomp);
1200
1201 if (in->pidfile)
1202 blobmsg_add_string(b, "pidfile", in->pidfile);
1203
1204 if (in->user)
1205 blobmsg_add_string(b, "user", in->user);
1206
1207 if (in->group)
1208 blobmsg_add_string(b, "group", in->group);
1209
1210 if (in->has_jail) {
1211 void *r = blobmsg_open_table(b, "jail");
1212 if (in->jail.name)
1213 blobmsg_add_string(b, "name", in->jail.name);
1214 if (in->jail.hostname)
1215 blobmsg_add_string(b, "hostname", in->jail.hostname);
1216 blobmsg_add_u8(b, "procfs", in->jail.procfs);
1217 blobmsg_add_u8(b, "sysfs", in->jail.sysfs);
1218 blobmsg_add_u8(b, "ubus", in->jail.ubus);
1219 blobmsg_add_u8(b, "log", in->jail.log);
1220 blobmsg_add_u8(b, "ronly", in->jail.ronly);
1221 blobmsg_close_table(b, r);
1222 if (!avl_is_empty(&in->jail.mount.avl)) {
1223 struct blobmsg_list_node *var;
1224 void *e = blobmsg_open_table(b, "mount");
1225 blobmsg_list_for_each(&in->jail.mount, var)
1226 blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1227 blobmsg_close_table(b, e);
1228 }
1229 }
1230
1231 if (verbose && in->trigger)
1232 blobmsg_add_blob(b, in->trigger);
1233
1234 blobmsg_close_table(b, i);
1235 }