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