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 <net/if.h>
  21 #include <unistd.h>
  22 #include <stdint.h>
  23 #include <stdio.h>
  24 #include <fcntl.h>
  25 #include <pwd.h>
  26 #include <libgen.h>
  27 #include <unistd.h>
  28
  29 #include <libubox/md5.h>
  30
  31 #include "../procd.h"
  32
  33 #include "service.h"
  34 #include "instance.h"
  35
  36
  37 enum {
  38         INSTANCE_ATTR_COMMAND,
  39         INSTANCE_ATTR_ENV,
  40         INSTANCE_ATTR_DATA,
  41         INSTANCE_ATTR_NETDEV,
  42         INSTANCE_ATTR_FILE,
  43         INSTANCE_ATTR_TRIGGER,
  44         INSTANCE_ATTR_RESPAWN,
  45         INSTANCE_ATTR_NICE,
  46         INSTANCE_ATTR_LIMITS,
  47         INSTANCE_ATTR_WATCH,
  48         INSTANCE_ATTR_ERROR,
  49         INSTANCE_ATTR_USER,
  50         INSTANCE_ATTR_STDOUT,
  51         INSTANCE_ATTR_STDERR,
  52         INSTANCE_ATTR_NO_NEW_PRIVS,
  53         INSTANCE_ATTR_JAIL,
  54         INSTANCE_ATTR_TRACE,
  55         INSTANCE_ATTR_SECCOMP,
  56         __INSTANCE_ATTR_MAX
  57 };
  58
  59 static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = {
  60         [INSTANCE_ATTR_COMMAND] = { "command", BLOBMSG_TYPE_ARRAY },
  61         [INSTANCE_ATTR_ENV] = { "env", BLOBMSG_TYPE_TABLE },
  62         [INSTANCE_ATTR_DATA] = { "data", BLOBMSG_TYPE_TABLE },
  63         [INSTANCE_ATTR_NETDEV] = { "netdev", BLOBMSG_TYPE_ARRAY },
  64         [INSTANCE_ATTR_FILE] = { "file", BLOBMSG_TYPE_ARRAY },
  65         [INSTANCE_ATTR_TRIGGER] = { "triggers", BLOBMSG_TYPE_ARRAY },
  66         [INSTANCE_ATTR_RESPAWN] = { "respawn", BLOBMSG_TYPE_ARRAY },
  67         [INSTANCE_ATTR_NICE] = { "nice", BLOBMSG_TYPE_INT32 },
  68         [INSTANCE_ATTR_LIMITS] = { "limits", BLOBMSG_TYPE_TABLE },
  69         [INSTANCE_ATTR_WATCH] = { "watch", BLOBMSG_TYPE_ARRAY },
  70         [INSTANCE_ATTR_ERROR] = { "error", BLOBMSG_TYPE_ARRAY },
  71         [INSTANCE_ATTR_USER] = { "user", BLOBMSG_TYPE_STRING },
  72         [INSTANCE_ATTR_STDOUT] = { "stdout", BLOBMSG_TYPE_BOOL },
  73         [INSTANCE_ATTR_STDERR] = { "stderr", BLOBMSG_TYPE_BOOL },
  74         [INSTANCE_ATTR_NO_NEW_PRIVS] = { "no_new_privs", BLOBMSG_TYPE_BOOL },
  75         [INSTANCE_ATTR_JAIL] = { "jail", BLOBMSG_TYPE_TABLE },
  76         [INSTANCE_ATTR_TRACE] = { "trace", BLOBMSG_TYPE_BOOL },
  77         [INSTANCE_ATTR_SECCOMP] = { "seccomp", BLOBMSG_TYPE_STRING },
  78 };
  79
  80 enum {
  81         JAIL_ATTR_NAME,
  82         JAIL_ATTR_HOSTNAME,
  83         JAIL_ATTR_PROCFS,
  84         JAIL_ATTR_SYSFS,
  85         JAIL_ATTR_UBUS,
  86         JAIL_ATTR_LOG,
  87         JAIL_ATTR_RONLY,
  88         JAIL_ATTR_MOUNT,
  89         __JAIL_ATTR_MAX,
  90 };
  91
  92 static const struct blobmsg_policy jail_attr[__JAIL_ATTR_MAX] = {
  93         [JAIL_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
  94         [JAIL_ATTR_HOSTNAME] = { "hostname", BLOBMSG_TYPE_STRING },
  95         [JAIL_ATTR_PROCFS] = { "procfs", BLOBMSG_TYPE_BOOL },
  96         [JAIL_ATTR_SYSFS] = { "sysfs", BLOBMSG_TYPE_BOOL },
  97         [JAIL_ATTR_UBUS] = { "ubus", BLOBMSG_TYPE_BOOL },
  98         [JAIL_ATTR_LOG] = { "log", BLOBMSG_TYPE_BOOL },
  99         [JAIL_ATTR_RONLY] = { "ronly", BLOBMSG_TYPE_BOOL },
 100         [JAIL_ATTR_MOUNT] = { "mount", BLOBMSG_TYPE_TABLE },
 101 };
 102
 103 struct instance_netdev {
 104         struct blobmsg_list_node node;
 105         int ifindex;
 106 };
 107
 108 struct instance_file {
 109         struct blobmsg_list_node node;
 110         uint32_t md5[4];
 111 };
 112
 113 struct rlimit_name {
 114         const char *name;
 115         int resource;
 116 };
 117
 118 static const struct rlimit_name rlimit_names[] = {
 119         { "as", RLIMIT_AS },
 120         { "core", RLIMIT_CORE },
 121         { "cpu", RLIMIT_CPU },
 122         { "data", RLIMIT_DATA },
 123         { "fsize", RLIMIT_FSIZE },
 124         { "memlock", RLIMIT_MEMLOCK },
 125         { "msgqueue", RLIMIT_MSGQUEUE },
 126         { "nice", RLIMIT_NICE },
 127         { "nofile", RLIMIT_NOFILE },
 128         { "nproc", RLIMIT_NPROC },
 129         { "rss", RLIMIT_RSS },
 130         { "rtprio", RLIMIT_RTPRIO },
 131         { "sigpending", RLIMIT_SIGPENDING },
 132         { "stack", RLIMIT_STACK },
 133         { NULL, 0 }
 134 };
 135
 136 static char trace[] = "/sbin/utrace";
 137
 138 static void closefd(int fd)
 139 {
 140         if (fd > STDERR_FILENO)
 141                 close(fd);
 142 }
 143
 144 static void
 145 instance_limits(const char *limit, const char *value)
 146 {
 147         int i;
 148         struct rlimit rlim;
 149         unsigned long cur, max;
 150
 151         for (i = 0; rlimit_names[i].name != NULL; i++) {
 152                 if (strcmp(rlimit_names[i].name, limit))
 153                         continue;
 154                 if (!strcmp(value, "unlimited")) {
 155                         rlim.rlim_cur = RLIM_INFINITY;
 156                         rlim.rlim_max = RLIM_INFINITY;
 157                 } else {
 158                         if (getrlimit(rlimit_names[i].resource, &rlim))
 159                                 return;
 160
 161                         cur = rlim.rlim_cur;
 162                         max = rlim.rlim_max;
 163
 164                         if (sscanf(value, "%lu %lu", &cur, &max) < 1)
 165                                 return;
 166
 167                         rlim.rlim_cur = cur;
 168                         rlim.rlim_max = max;
 169                 }
 170
 171                 setrlimit(rlimit_names[i].resource, &rlim);
 172                 return;
 173         }
 174 }
 175
 176 static inline int
 177 jail_run(struct service_instance *in, char **argv)
 178 {
 179         struct blobmsg_list_node *var;
 180         struct jail *jail = &in->jail;
 181         int argc = 0;
 182
 183         argv[argc++] = "/sbin/ujail";
 184
 185         if (jail->name) {
 186                 argv[argc++] = "-n";
 187                 argv[argc++] = jail->name;
 188         }
 189
 190         if (jail->hostname) {
 191                 argv[argc++] = "-h";
 192                 argv[argc++] = jail->hostname;
 193         }
 194
 195         if (in->seccomp) {
 196                 argv[argc++] = "-S";
 197                 argv[argc++] = in->seccomp;
 198         }
 199
 200         if (in->no_new_privs)
 201                 argv[argc++] = "-c";
 202
 203         if (jail->procfs)
 204                 argv[argc++] = "-p";
 205
 206         if (jail->sysfs)
 207                 argv[argc++] = "-s";
 208
 209         if (jail->ubus)
 210                 argv[argc++] = "-u";
 211
 212         if (jail->log)
 213                 argv[argc++] = "-l";
 214
 215         if (jail->ronly)
 216                 argv[argc++] = "-o";
 217
 218         blobmsg_list_for_each(&jail->mount, var) {
 219                 const char *type = blobmsg_data(var->data);
 220
 221                 if (*type == '1')
 222                         argv[argc++] = "-w";
 223                 else
 224                         argv[argc++] = "-r";
 225                 argv[argc++] = (char *) blobmsg_name(var->data);
 226         }
 227
 228         argv[argc++] = "--";
 229
 230         return argc;
 231 }
 232
 233 static void
 234 instance_run(struct service_instance *in, int _stdout, int _stderr)
 235 {
 236         struct blobmsg_list_node *var;
 237         struct blob_attr *cur;
 238         char **argv;
 239         char *ld_preload;
 240         int argc = 1; /* NULL terminated */
 241         int rem, _stdin;
 242         bool seccomp = !in->trace && !in->has_jail && in->seccomp;
 243         bool setlbf = _stdout >= 0;
 244
 245         if (in->nice)
 246                 setpriority(PRIO_PROCESS, 0, in->nice);
 247
 248         blobmsg_for_each_attr(cur, in->command, rem)
 249                 argc++;
 250
 251         blobmsg_list_for_each(&in->env, var)
 252                 setenv(blobmsg_name(var->data), blobmsg_data(var->data), 1);
 253
 254         if (seccomp)
 255                 setenv("SECCOMP_FILE", in->seccomp, 1);
 256
 257         if ((seccomp || setlbf) && asprintf(&ld_preload, "LD_PRELOAD=%s%s%s",
 258                         seccomp ? "/lib/libpreload-seccomp.so" : "",
 259                         seccomp && setlbf ? ":" : "",
 260                         setlbf ? "/lib/libsetlbf.so" : "") > 0)
 261                 putenv(ld_preload);
 262
 263         blobmsg_list_for_each(&in->limits, var)
 264                 instance_limits(blobmsg_name(var->data), blobmsg_data(var->data));
 265
 266         if (in->trace)
 267                 argc += 1;
 268
 269         argv = alloca(sizeof(char *) * (argc + in->jail.argc));
 270         argc = 0;
 271
 272         if (in->trace)
 273                 argv[argc++] = trace;
 274
 275         if (in->has_jail)
 276                 argc = jail_run(in, argv);
 277
 278         blobmsg_for_each_attr(cur, in->command, rem)
 279                 argv[argc++] = blobmsg_data(cur);
 280
 281         argv[argc] = NULL;
 282
 283         _stdin = open("/dev/null", O_RDONLY);
 284
 285         if (_stdout == -1)
 286                 _stdout = open("/dev/null", O_WRONLY);
 287
 288         if (_stderr == -1)
 289                 _stderr = open("/dev/null", O_WRONLY);
 290
 291         if (_stdin > -1) {
 292                 dup2(_stdin, STDIN_FILENO);
 293                 closefd(_stdin);
 294         }
 295         if (_stdout > -1) {
 296                 dup2(_stdout, STDOUT_FILENO);
 297                 closefd(_stdout);
 298         }
 299         if (_stderr > -1) {
 300                 dup2(_stderr, STDERR_FILENO);
 301                 closefd(_stderr);
 302         }
 303
 304         if (in->gid && setgid(in->gid)) {
 305                 ERROR("failed to set group id %d: %d (%s)\n", in->gid, errno, strerror(errno));
 306                 exit(127);
 307         }
 308         if (in->uid && setuid(in->uid)) {
 309                 ERROR("failed to set user id %d: %d (%s)\n", in->uid, errno, strerror(errno));
 310                 exit(127);
 311         }
 312
 313         execvp(argv[0], argv);
 314         exit(127);
 315 }
 316
 317 static void
 318 instance_free_stdio(struct service_instance *in)
 319 {
 320         if (in->_stdout.fd.fd > -1) {
 321                 ustream_free(&in->_stdout.stream);
 322                 close(in->_stdout.fd.fd);
 323                 in->_stdout.fd.fd = -1;
 324         }
 325
 326         if (in->_stderr.fd.fd > -1) {
 327                 ustream_free(&in->_stderr.stream);
 328                 close(in->_stderr.fd.fd);
 329                 in->_stderr.fd.fd = -1;
 330         }
 331 }
 332
 333 void
 334 instance_start(struct service_instance *in)
 335 {
 336         int pid;
 337         int opipe[2] = { -1, -1 };
 338         int epipe[2] = { -1, -1 };
 339
 340         if (!avl_is_empty(&in->errors.avl)) {
 341                 LOG("Not starting instance %s::%s, an error was indicated\n", in->srv->name, in->name);
 342                 return;
 343         }
 344
 345         if (in->proc.pending)
 346                 return;
 347
 348         instance_free_stdio(in);
 349         if (in->_stdout.fd.fd > -2) {
 350                 if (pipe(opipe)) {
 351                         ULOG_WARN("pipe() failed: %d (%s)\n", errno, strerror(errno));
 352                         opipe[0] = opipe[1] = -1;
 353                 }
 354         }
 355
 356         if (in->_stderr.fd.fd > -2) {
 357                 if (pipe(epipe)) {
 358                         ULOG_WARN("pipe() failed: %d (%s)\n", errno, strerror(errno));
 359                         epipe[0] = epipe[1] = -1;
 360                 }
 361         }
 362
 363         in->restart = false;
 364         in->halt = !in->respawn;
 365
 366         if (!in->valid)
 367                 return;
 368
 369         pid = fork();
 370         if (pid < 0)
 371                 return;
 372
 373         if (!pid) {
 374                 uloop_done();
 375                 closefd(opipe[0]);
 376                 closefd(epipe[0]);
 377                 instance_run(in, opipe[1], epipe[1]);
 378                 return;
 379         }
 380
 381         DEBUG(2, "Started instance %s::%s\n", in->srv->name, in->name);
 382         in->proc.pid = pid;
 383         clock_gettime(CLOCK_MONOTONIC, &in->start);
 384         uloop_process_add(&in->proc);
 385
 386         if (opipe[0] > -1) {
 387                 ustream_fd_init(&in->_stdout, opipe[0]);
 388                 closefd(opipe[1]);
 389         }
 390
 391         if (epipe[0] > -1) {
 392                 ustream_fd_init(&in->_stderr, epipe[0]);
 393                 closefd(epipe[1]);
 394         }
 395
 396         service_event("instance.start", in->srv->name, in->name);
 397 }
 398
 399 static void
 400 instance_stdio(struct ustream *s, int prio, struct service_instance *in)
 401 {
 402         char *newline, *str, *arg0, ident[32];
 403         int len;
 404
 405         arg0 = basename(blobmsg_data(blobmsg_data(in->command)));
 406         snprintf(ident, sizeof(ident), "%s[%d]", arg0, in->proc.pid);
 407         ulog_open(ULOG_SYSLOG, LOG_DAEMON, ident);
 408
 409         do {
 410                 str = ustream_get_read_buf(s, NULL);
 411                 if (!str)
 412                         break;
 413
 414                 newline = strchr(str, '\n');
 415                 if (!newline)
 416                         break;
 417
 418                 *newline = 0;
 419                 ulog(prio, "%s\n", str);
 420
 421                 len = newline + 1 - str;
 422                 ustream_consume(s, len);
 423         } while (1);
 424
 425         ulog_open(ULOG_SYSLOG, LOG_DAEMON, "procd");
 426 }
 427
 428 static void
 429 instance_stdout(struct ustream *s, int bytes)
 430 {
 431         instance_stdio(s, LOG_INFO,
 432                        container_of(s, struct service_instance, _stdout.stream));
 433 }
 434
 435 static void
 436 instance_stderr(struct ustream *s, int bytes)
 437 {
 438         instance_stdio(s, LOG_ERR,
 439                        container_of(s, struct service_instance, _stderr.stream));
 440 }
 441
 442 static void
 443 instance_timeout(struct uloop_timeout *t)
 444 {
 445         struct service_instance *in;
 446
 447         in = container_of(t, struct service_instance, timeout);
 448
 449         if (!in->halt && (in->restart || in->respawn))
 450                 instance_start(in);
 451 }
 452
 453 static void
 454 instance_exit(struct uloop_process *p, int ret)
 455 {
 456         struct service_instance *in;
 457         struct timespec tp;
 458         long runtime;
 459
 460         in = container_of(p, struct service_instance, proc);
 461
 462         clock_gettime(CLOCK_MONOTONIC, &tp);
 463         runtime = tp.tv_sec - in->start.tv_sec;
 464
 465         DEBUG(2, "Instance %s::%s exit with error code %d after %ld seconds\n", in->srv->name, in->name, ret, runtime);
 466         if (upgrade_running)
 467                 return;
 468
 469         uloop_timeout_cancel(&in->timeout);
 470         if (in->halt) {
 471                 /* no action */
 472         } else if (in->restart) {
 473                 instance_start(in);
 474         } else if (in->respawn) {
 475                 if (runtime < in->respawn_threshold)
 476                         in->respawn_count++;
 477                 else
 478                         in->respawn_count = 0;
 479                 if (in->respawn_count > in->respawn_retry && in->respawn_retry > 0 ) {
 480                         LOG("Instance %s::%s s in a crash loop %d crashes, %ld seconds since last crash\n",
 481                                                                 in->srv->name, in->name, in->respawn_count, runtime);
 482                         in->restart = in->respawn = 0;
 483                         in->halt = 1;
 484                 } else {
 485                         uloop_timeout_set(&in->timeout, in->respawn_timeout * 1000);
 486                 }
 487         }
 488         service_event("instance.stop", in->srv->name, in->name);
 489 }
 490
 491 void
 492 instance_stop(struct service_instance *in)
 493 {
 494         if (!in->proc.pending)
 495                 return;
 496         in->halt = true;
 497         in->restart = in->respawn = false;
 498         kill(in->proc.pid, SIGTERM);
 499 }
 500
 501 static void
 502 instance_restart(struct service_instance *in)
 503 {
 504         if (!in->proc.pending)
 505                 return;
 506         in->halt = false;
 507         in->restart = true;
 508         kill(in->proc.pid, SIGTERM);
 509 }
 510
 511 static bool
 512 instance_config_changed(struct service_instance *in, struct service_instance *in_new)
 513 {
 514         if (!in->valid)
 515                 return true;
 516
 517         if (!blob_attr_equal(in->command, in_new->command))
 518                 return true;
 519
 520         if (!blobmsg_list_equal(&in->env, &in_new->env))
 521                 return true;
 522
 523         if (!blobmsg_list_equal(&in->data, &in_new->data))
 524                 return true;
 525
 526         if (!blobmsg_list_equal(&in->netdev, &in_new->netdev))
 527                 return true;
 528
 529         if (!blobmsg_list_equal(&in->file, &in_new->file))
 530                 return true;
 531
 532         if (in->nice != in_new->nice)
 533                 return true;
 534
 535         if (in->uid != in_new->uid)
 536                 return true;
 537
 538         if (in->gid != in_new->gid)
 539                 return true;
 540
 541         if (!blobmsg_list_equal(&in->limits, &in_new->limits))
 542                 return true;
 543
 544         if (!blobmsg_list_equal(&in->jail.mount, &in_new->jail.mount))
 545                 return true;
 546
 547         if (!blobmsg_list_equal(&in->errors, &in_new->errors))
 548                 return true;
 549
 550         return false;
 551 }
 552
 553 static bool
 554 instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 555 {
 556         struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
 557         struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
 558
 559         return n1->ifindex == n2->ifindex;
 560 }
 561
 562 static void
 563 instance_netdev_update(struct blobmsg_list_node *l)
 564 {
 565         struct instance_netdev *n = container_of(l, struct instance_netdev, node);
 566
 567         n->ifindex = if_nametoindex(n->node.avl.key);
 568 }
 569
 570 static bool
 571 instance_file_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 572 {
 573         struct instance_file *f1 = container_of(l1, struct instance_file, node);
 574         struct instance_file *f2 = container_of(l2, struct instance_file, node);
 575
 576         return !memcmp(f1->md5, f2->md5, sizeof(f1->md5));
 577 }
 578
 579 static void
 580 instance_file_update(struct blobmsg_list_node *l)
 581 {
 582         struct instance_file *f = container_of(l, struct instance_file, node);
 583         md5_ctx_t md5;
 584         char buf[256];
 585         int len, fd;
 586
 587         memset(f->md5, 0, sizeof(f->md5));
 588
 589         fd = open(l->avl.key, O_RDONLY);
 590         if (fd < 0)
 591                 return;
 592
 593         md5_begin(&md5);
 594         do {
 595                 len = read(fd, buf, sizeof(buf));
 596                 if (len < 0) {
 597                         if (errno == EINTR)
 598                                 continue;
 599
 600                         break;
 601                 }
 602                 if (!len)
 603                         break;
 604
 605                 md5_hash(buf, len, &md5);
 606         } while(1);
 607
 608         md5_end(f->md5, &md5);
 609         close(fd);
 610 }
 611
 612 static void
 613 instance_fill_any(struct blobmsg_list *l, struct blob_attr *cur)
 614 {
 615         if (!cur)
 616                 return;
 617
 618         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), false);
 619 }
 620
 621 static bool
 622 instance_fill_array(struct blobmsg_list *l, struct blob_attr *cur, blobmsg_update_cb cb, bool array)
 623 {
 624         struct blobmsg_list_node *node;
 625
 626         if (!cur)
 627                 return true;
 628
 629         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 630                 return false;
 631
 632         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), array);
 633         if (cb) {
 634                 blobmsg_list_for_each(l, node)
 635                         cb(node);
 636         }
 637         return true;
 638 }
 639
 640 static int
 641 instance_jail_parse(struct service_instance *in, struct blob_attr *attr)
 642 {
 643         struct blob_attr *tb[__JAIL_ATTR_MAX];
 644         struct jail *jail = &in->jail;
 645         struct stat s;
 646
 647         if (stat("/sbin/ujail", &s))
 648                 return 0;
 649
 650         blobmsg_parse(jail_attr, __JAIL_ATTR_MAX, tb,
 651                 blobmsg_data(attr), blobmsg_data_len(attr));
 652
 653         jail->argc = 2;
 654
 655         if (tb[JAIL_ATTR_NAME]) {
 656                 jail->name = blobmsg_get_string(tb[JAIL_ATTR_NAME]);
 657                 jail->argc += 2;
 658         }
 659         if (tb[JAIL_ATTR_HOSTNAME]) {
 660                 jail->hostname = blobmsg_get_string(tb[JAIL_ATTR_HOSTNAME]);
 661                 jail->argc += 2;
 662         }
 663         if (tb[JAIL_ATTR_PROCFS]) {
 664                 jail->procfs = blobmsg_get_bool(tb[JAIL_ATTR_PROCFS]);
 665                 jail->argc++;
 666         }
 667         if (tb[JAIL_ATTR_SYSFS]) {
 668                 jail->sysfs = blobmsg_get_bool(tb[JAIL_ATTR_SYSFS]);
 669                 jail->argc++;
 670         }
 671         if (tb[JAIL_ATTR_UBUS]) {
 672                 jail->ubus = blobmsg_get_bool(tb[JAIL_ATTR_UBUS]);
 673                 jail->argc++;
 674         }
 675         if (tb[JAIL_ATTR_LOG]) {
 676                 jail->log = blobmsg_get_bool(tb[JAIL_ATTR_LOG]);
 677                 jail->argc++;
 678         }
 679         if (tb[JAIL_ATTR_RONLY]) {
 680                 jail->ronly = blobmsg_get_bool(tb[JAIL_ATTR_RONLY]);
 681                 jail->argc++;
 682         }
 683         if (tb[JAIL_ATTR_MOUNT]) {
 684                 struct blob_attr *cur;
 685                 int rem;
 686
 687                 blobmsg_for_each_attr(cur, tb[JAIL_ATTR_MOUNT], rem)
 688                         jail->argc += 2;
 689                 instance_fill_array(&jail->mount, tb[JAIL_ATTR_MOUNT], NULL, false);
 690         }
 691         if (in->seccomp)
 692                 jail->argc += 2;
 693
 694         return 1;
 695 }
 696
 697 static bool
 698 instance_config_parse(struct service_instance *in)
 699 {
 700         struct blob_attr *tb[__INSTANCE_ATTR_MAX];
 701         struct blob_attr *cur, *cur2;
 702         int argc = 0;
 703         int rem;
 704
 705         blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
 706                 blobmsg_data(in->config), blobmsg_data_len(in->config));
 707
 708         cur = tb[INSTANCE_ATTR_COMMAND];
 709         if (!cur)
 710                 return false;
 711
 712         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 713                 return false;
 714
 715         blobmsg_for_each_attr(cur2, cur, rem) {
 716                 argc++;
 717                 break;
 718         }
 719         if (!argc)
 720                 return false;
 721
 722         in->command = cur;
 723
 724         if (tb[INSTANCE_ATTR_RESPAWN]) {
 725                 int i = 0;
 726                 uint32_t vals[3] = { 3600, 5, 5};
 727
 728                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_RESPAWN], rem) {
 729                         if ((i >= 3) && (blobmsg_type(cur2) == BLOBMSG_TYPE_STRING))
 730                                 continue;
 731                         vals[i] = atoi(blobmsg_get_string(cur2));
 732                         i++;
 733                 }
 734                 in->respawn = true;
 735                 in->respawn_count = 0;
 736                 in->respawn_threshold = vals[0];
 737                 in->respawn_timeout = vals[1];
 738                 in->respawn_retry = vals[2];
 739         }
 740         if (tb[INSTANCE_ATTR_TRIGGER]) {
 741                 in->trigger = tb[INSTANCE_ATTR_TRIGGER];
 742                 trigger_add(in->trigger, in);
 743         }
 744
 745         if (tb[INSTANCE_ATTR_WATCH]) {
 746                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_WATCH], rem) {
 747                         if (blobmsg_type(cur2) != BLOBMSG_TYPE_STRING)
 748                                 continue;
 749                         DEBUG(3, "watch for %s\n", blobmsg_get_string(cur2));
 750                         watch_add(blobmsg_get_string(cur2), in);
 751                 }
 752         }
 753
 754         if ((cur = tb[INSTANCE_ATTR_NICE])) {
 755                 in->nice = (int8_t) blobmsg_get_u32(cur);
 756                 if (in->nice < -20 || in->nice > 20)
 757                         return false;
 758         }
 759
 760         if (tb[INSTANCE_ATTR_USER]) {
 761                 struct passwd *p = getpwnam(blobmsg_get_string(tb[INSTANCE_ATTR_USER]));
 762                 if (p) {
 763                         in->uid = p->pw_uid;
 764                         in->gid = p->pw_gid;
 765                 }
 766         }
 767
 768         if (tb[INSTANCE_ATTR_TRACE])
 769                 in->trace = blobmsg_get_bool(tb[INSTANCE_ATTR_TRACE]);
 770
 771         if (tb[INSTANCE_ATTR_NO_NEW_PRIVS])
 772                 in->no_new_privs = blobmsg_get_bool(tb[INSTANCE_ATTR_NO_NEW_PRIVS]);
 773
 774         if (!in->trace && tb[INSTANCE_ATTR_SECCOMP]) {
 775                 char *seccomp = blobmsg_get_string(tb[INSTANCE_ATTR_SECCOMP]);
 776                 struct stat s;
 777
 778                 if (stat(seccomp, &s))
 779                         ERROR("%s: not starting seccomp as %s is missing\n", in->name, seccomp);
 780                 else
 781                         in->seccomp = seccomp;
 782         }
 783         if (!in->trace && tb[INSTANCE_ATTR_JAIL])
 784                 in->has_jail = instance_jail_parse(in, tb[INSTANCE_ATTR_JAIL]);
 785
 786         if (tb[INSTANCE_ATTR_STDOUT] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDOUT]))
 787                 in->_stdout.fd.fd = -1;
 788
 789         if (tb[INSTANCE_ATTR_STDERR] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDERR]))
 790                 in->_stderr.fd.fd = -1;
 791
 792         instance_fill_any(&in->data, tb[INSTANCE_ATTR_DATA]);
 793
 794         if (!instance_fill_array(&in->env, tb[INSTANCE_ATTR_ENV], NULL, false))
 795                 return false;
 796
 797         if (!instance_fill_array(&in->netdev, tb[INSTANCE_ATTR_NETDEV], instance_netdev_update, true))
 798                 return false;
 799
 800         if (!instance_fill_array(&in->file, tb[INSTANCE_ATTR_FILE], instance_file_update, true))
 801                 return false;
 802
 803         if (!instance_fill_array(&in->limits, tb[INSTANCE_ATTR_LIMITS], NULL, false))
 804                 return false;
 805
 806         if (!instance_fill_array(&in->errors, tb[INSTANCE_ATTR_ERROR], NULL, true))
 807                 return false;
 808
 809         return true;
 810 }
 811
 812 static void
 813 instance_config_cleanup(struct service_instance *in)
 814 {
 815         blobmsg_list_free(&in->env);
 816         blobmsg_list_free(&in->data);
 817         blobmsg_list_free(&in->netdev);
 818         blobmsg_list_free(&in->file);
 819         blobmsg_list_free(&in->limits);
 820         blobmsg_list_free(&in->errors);
 821         blobmsg_list_free(&in->jail.mount);
 822 }
 823
 824 static void
 825 instance_config_move(struct service_instance *in, struct service_instance *in_src)
 826 {
 827         instance_config_cleanup(in);
 828         blobmsg_list_move(&in->env, &in_src->env);
 829         blobmsg_list_move(&in->data, &in_src->data);
 830         blobmsg_list_move(&in->netdev, &in_src->netdev);
 831         blobmsg_list_move(&in->file, &in_src->file);
 832         blobmsg_list_move(&in->limits, &in_src->limits);
 833         blobmsg_list_move(&in->errors, &in_src->errors);
 834         blobmsg_list_move(&in->jail.mount, &in_src->jail.mount);
 835         in->trigger = in_src->trigger;
 836         in->command = in_src->command;
 837         in->name = in_src->name;
 838         in->node.avl.key = in_src->node.avl.key;
 839
 840         free(in->config);
 841         in->config = in_src->config;
 842         in_src->config = NULL;
 843 }
 844
 845 bool
 846 instance_update(struct service_instance *in, struct service_instance *in_new)
 847 {
 848         bool changed = instance_config_changed(in, in_new);
 849         bool running = in->proc.pending;
 850
 851         if (!changed && running)
 852                 return false;
 853
 854         if (!running) {
 855                 if (changed)
 856                         instance_config_move(in, in_new);
 857                 instance_start(in);
 858         } else {
 859                 instance_restart(in);
 860                 instance_config_move(in, in_new);
 861                 /* restart happens in the child callback handler */
 862         }
 863         return true;
 864 }
 865
 866 void
 867 instance_free(struct service_instance *in)
 868 {
 869         instance_free_stdio(in);
 870         uloop_process_delete(&in->proc);
 871         uloop_timeout_cancel(&in->timeout);
 872         trigger_del(in);
 873         watch_del(in);
 874         instance_config_cleanup(in);
 875         free(in->config);
 876         free(in);
 877 }
 878
 879 void
 880 instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
 881 {
 882         config = blob_memdup(config);
 883         in->srv = s;
 884         in->name = blobmsg_name(config);
 885         in->config = config;
 886         in->timeout.cb = instance_timeout;
 887         in->proc.cb = instance_exit;
 888
 889         in->_stdout.fd.fd = -2;
 890         in->_stdout.stream.string_data = true;
 891         in->_stdout.stream.notify_read = instance_stdout;
 892
 893         in->_stderr.fd.fd = -2;
 894         in->_stderr.stream.string_data = true;
 895         in->_stderr.stream.notify_read = instance_stderr;
 896
 897         blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
 898         blobmsg_list_init(&in->file, struct instance_file, node, instance_file_cmp);
 899         blobmsg_list_simple_init(&in->env);
 900         blobmsg_list_simple_init(&in->data);
 901         blobmsg_list_simple_init(&in->limits);
 902         blobmsg_list_simple_init(&in->errors);
 903         blobmsg_list_simple_init(&in->jail.mount);
 904         in->valid = instance_config_parse(in);
 905 }
 906
 907 void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
 908 {
 909         void *i;
 910
 911         if (!in->valid)
 912                 return;
 913
 914         i = blobmsg_open_table(b, in->name);
 915         blobmsg_add_u8(b, "running", in->proc.pending);
 916         if (in->proc.pending)
 917                 blobmsg_add_u32(b, "pid", in->proc.pid);
 918         blobmsg_add_blob(b, in->command);
 919
 920         if (!avl_is_empty(&in->errors.avl)) {
 921                 struct blobmsg_list_node *var;
 922                 void *e = blobmsg_open_array(b, "errors");
 923                 blobmsg_list_for_each(&in->errors, var)
 924                         blobmsg_add_string(b, NULL, blobmsg_data(var->data));
 925                 blobmsg_close_table(b, e);
 926         }
 927
 928         if (!avl_is_empty(&in->env.avl)) {
 929                 struct blobmsg_list_node *var;
 930                 void *e = blobmsg_open_table(b, "env");
 931                 blobmsg_list_for_each(&in->env, var)
 932                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
 933                 blobmsg_close_table(b, e);
 934         }
 935
 936         if (!avl_is_empty(&in->data.avl)) {
 937                 struct blobmsg_list_node *var;
 938                 void *e = blobmsg_open_table(b, "data");
 939                 blobmsg_list_for_each(&in->data, var)
 940                         blobmsg_add_blob(b, var->data);
 941                 blobmsg_close_table(b, e);
 942         }
 943
 944         if (!avl_is_empty(&in->limits.avl)) {
 945                 struct blobmsg_list_node *var;
 946                 void *e = blobmsg_open_table(b, "limits");
 947                 blobmsg_list_for_each(&in->limits, var)
 948                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
 949                 blobmsg_close_table(b, e);
 950         }
 951
 952         if (in->respawn) {
 953                 void *r = blobmsg_open_table(b, "respawn");
 954                 blobmsg_add_u32(b, "threshold", in->respawn_threshold);
 955                 blobmsg_add_u32(b, "timeout", in->respawn_timeout);
 956                 blobmsg_add_u32(b, "retry", in->respawn_retry);
 957                 blobmsg_close_table(b, r);
 958         }
 959
 960         if (in->trace)
 961                 blobmsg_add_u8(b, "trace", true);
 962
 963         if (in->no_new_privs)
 964                 blobmsg_add_u8(b, "no_new_privs", true);
 965
 966         if (in->seccomp)
 967                 blobmsg_add_string(b, "seccomp", in->seccomp);
 968
 969         if (in->has_jail) {
 970                 void *r = blobmsg_open_table(b, "jail");
 971                 if (in->jail.name)
 972                         blobmsg_add_string(b, "name", in->jail.name);
 973                 if (in->jail.hostname)
 974                         blobmsg_add_string(b, "hostname", in->jail.hostname);
 975                 blobmsg_add_u8(b, "procfs", in->jail.procfs);
 976                 blobmsg_add_u8(b, "sysfs", in->jail.sysfs);
 977                 blobmsg_add_u8(b, "ubus", in->jail.ubus);
 978                 blobmsg_add_u8(b, "log", in->jail.log);
 979                 blobmsg_add_u8(b, "ronly", in->jail.ronly);
 980                 blobmsg_close_table(b, r);
 981                 if (!avl_is_empty(&in->jail.mount.avl)) {
 982                         struct blobmsg_list_node *var;
 983                         void *e = blobmsg_open_table(b, "mount");
 984                         blobmsg_list_for_each(&in->jail.mount, var)
 985                                 blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
 986                         blobmsg_close_table(b, e);
 987                 }
 988         }
 989
 990         if (verbose && in->trigger)
 991                 blobmsg_add_blob(b, in->trigger);
 992
 993         blobmsg_close_table(b, i);
 994 }