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
 299 instance_free_stdio(struct service_instance *in)
 300 {
 301         if (in->_stdout.fd.fd > -1) {
 302                 ustream_free(&in->_stdout.stream);
 303                 close(in->_stdout.fd.fd);
 304                 in->_stdout.fd.fd = -1;
 305         }
 306
 307         if (in->_stderr.fd.fd > -1) {
 308                 ustream_free(&in->_stderr.stream);
 309                 close(in->_stderr.fd.fd);
 310                 in->_stderr.fd.fd = -1;
 311         }
 312 }
 313
 314 void
 315 instance_start(struct service_instance *in)
 316 {
 317         int pid;
 318         int opipe[2] = { -1, -1 };
 319         int epipe[2] = { -1, -1 };
 320
 321         if (!avl_is_empty(&in->errors.avl)) {
 322                 LOG("Not starting instance %s::%s, an error was indicated\n", in->srv->name, in->name);
 323                 return;
 324         }
 325
 326         if (in->proc.pending)
 327                 return;
 328
 329         instance_free_stdio(in);
 330         if (in->_stdout.fd.fd > -2) {
 331                 if (pipe(opipe)) {
 332                         ULOG_WARN("pipe() failed: %d (%s)\n", errno, strerror(errno));
 333                         opipe[0] = opipe[1] = -1;
 334                 }
 335         }
 336
 337         if (in->_stderr.fd.fd > -2) {
 338                 if (pipe(epipe)) {
 339                         ULOG_WARN("pipe() failed: %d (%s)\n", errno, strerror(errno));
 340                         epipe[0] = epipe[1] = -1;
 341                 }
 342         }
 343
 344         in->restart = false;
 345         in->halt = !in->respawn;
 346
 347         if (!in->valid)
 348                 return;
 349
 350         pid = fork();
 351         if (pid < 0)
 352                 return;
 353
 354         if (!pid) {
 355                 uloop_done();
 356                 closefd(opipe[0]);
 357                 closefd(epipe[0]);
 358                 instance_run(in, opipe[1], epipe[1]);
 359                 return;
 360         }
 361
 362         DEBUG(2, "Started instance %s::%s\n", in->srv->name, in->name);
 363         in->proc.pid = pid;
 364         clock_gettime(CLOCK_MONOTONIC, &in->start);
 365         uloop_process_add(&in->proc);
 366
 367         if (opipe[0] > -1) {
 368                 ustream_fd_init(&in->_stdout, opipe[0]);
 369                 closefd(opipe[1]);
 370         }
 371
 372         if (epipe[0] > -1) {
 373                 ustream_fd_init(&in->_stderr, epipe[0]);
 374                 closefd(epipe[1]);
 375         }
 376
 377         service_event("instance.start", in->srv->name, in->name);
 378 }
 379
 380 static void
 381 instance_stdio(struct ustream *s, int prio, struct service_instance *in)
 382 {
 383         char *newline, *str, *arg0, ident[32];
 384         int len;
 385
 386         arg0 = basename(blobmsg_data(blobmsg_data(in->command)));
 387         snprintf(ident, sizeof(ident), "%s[%d]", arg0, in->proc.pid);
 388         ulog_open(ULOG_SYSLOG, LOG_DAEMON, ident);
 389
 390         do {
 391                 str = ustream_get_read_buf(s, NULL);
 392                 if (!str)
 393                         break;
 394
 395                 newline = strchr(str, '\n');
 396                 if (!newline)
 397                         break;
 398
 399                 *newline = 0;
 400                 ulog(prio, "%s\n", str);
 401
 402                 len = newline + 1 - str;
 403                 ustream_consume(s, len);
 404         } while (1);
 405
 406         ulog_open(ULOG_SYSLOG, LOG_DAEMON, "procd");
 407 }
 408
 409 static void
 410 instance_stdout(struct ustream *s, int bytes)
 411 {
 412         instance_stdio(s, LOG_INFO,
 413                        container_of(s, struct service_instance, _stdout.stream));
 414 }
 415
 416 static void
 417 instance_stderr(struct ustream *s, int bytes)
 418 {
 419         instance_stdio(s, LOG_ERR,
 420                        container_of(s, struct service_instance, _stderr.stream));
 421 }
 422
 423 static void
 424 instance_timeout(struct uloop_timeout *t)
 425 {
 426         struct service_instance *in;
 427
 428         in = container_of(t, struct service_instance, timeout);
 429
 430         if (!in->halt && (in->restart || in->respawn))
 431                 instance_start(in);
 432 }
 433
 434 static void
 435 instance_exit(struct uloop_process *p, int ret)
 436 {
 437         struct service_instance *in;
 438         struct timespec tp;
 439         long runtime;
 440
 441         in = container_of(p, struct service_instance, proc);
 442
 443         clock_gettime(CLOCK_MONOTONIC, &tp);
 444         runtime = tp.tv_sec - in->start.tv_sec;
 445
 446         DEBUG(2, "Instance %s::%s exit with error code %d after %ld seconds\n", in->srv->name, in->name, ret, runtime);
 447         if (upgrade_running)
 448                 return;
 449
 450         uloop_timeout_cancel(&in->timeout);
 451         if (in->halt) {
 452                 /* no action */
 453         } else if (in->restart) {
 454                 instance_start(in);
 455         } else if (in->respawn) {
 456                 if (runtime < in->respawn_threshold)
 457                         in->respawn_count++;
 458                 else
 459                         in->respawn_count = 0;
 460                 if (in->respawn_count > in->respawn_retry && in->respawn_retry > 0 ) {
 461                         LOG("Instance %s::%s s in a crash loop %d crashes, %ld seconds since last crash\n",
 462                                                                 in->srv->name, in->name, in->respawn_count, runtime);
 463                         in->restart = in->respawn = 0;
 464                         in->halt = 1;
 465                 } else {
 466                         uloop_timeout_set(&in->timeout, in->respawn_timeout * 1000);
 467                 }
 468         }
 469         service_event("instance.stop", in->srv->name, in->name);
 470 }
 471
 472 void
 473 instance_stop(struct service_instance *in)
 474 {
 475         if (!in->proc.pending)
 476                 return;
 477         in->halt = true;
 478         in->restart = in->respawn = false;
 479         kill(in->proc.pid, SIGTERM);
 480 }
 481
 482 static void
 483 instance_restart(struct service_instance *in)
 484 {
 485         if (!in->proc.pending)
 486                 return;
 487         in->halt = false;
 488         in->restart = true;
 489         kill(in->proc.pid, SIGTERM);
 490 }
 491
 492 static bool
 493 instance_config_changed(struct service_instance *in, struct service_instance *in_new)
 494 {
 495         if (!in->valid)
 496                 return true;
 497
 498         if (!blob_attr_equal(in->command, in_new->command))
 499                 return true;
 500
 501         if (!blobmsg_list_equal(&in->env, &in_new->env))
 502                 return true;
 503
 504         if (!blobmsg_list_equal(&in->data, &in_new->data))
 505                 return true;
 506
 507         if (!blobmsg_list_equal(&in->netdev, &in_new->netdev))
 508                 return true;
 509
 510         if (!blobmsg_list_equal(&in->file, &in_new->file))
 511                 return true;
 512
 513         if (in->nice != in_new->nice)
 514                 return true;
 515
 516         if (in->uid != in_new->uid)
 517                 return true;
 518
 519         if (in->gid != in_new->gid)
 520                 return true;
 521
 522         if (!blobmsg_list_equal(&in->limits, &in_new->limits))
 523                 return true;
 524
 525         if (!blobmsg_list_equal(&in->jail.mount, &in_new->jail.mount))
 526                 return true;
 527
 528         if (!blobmsg_list_equal(&in->errors, &in_new->errors))
 529                 return true;
 530
 531         return false;
 532 }
 533
 534 static bool
 535 instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 536 {
 537         struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
 538         struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
 539
 540         return n1->ifindex == n2->ifindex;
 541 }
 542
 543 static void
 544 instance_netdev_update(struct blobmsg_list_node *l)
 545 {
 546         struct instance_netdev *n = container_of(l, struct instance_netdev, node);
 547
 548         n->ifindex = if_nametoindex(n->node.avl.key);
 549 }
 550
 551 static bool
 552 instance_file_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 553 {
 554         struct instance_file *f1 = container_of(l1, struct instance_file, node);
 555         struct instance_file *f2 = container_of(l2, struct instance_file, node);
 556
 557         return !memcmp(f1->md5, f2->md5, sizeof(f1->md5));
 558 }
 559
 560 static void
 561 instance_file_update(struct blobmsg_list_node *l)
 562 {
 563         struct instance_file *f = container_of(l, struct instance_file, node);
 564         md5_ctx_t md5;
 565         char buf[256];
 566         int len, fd;
 567
 568         memset(f->md5, 0, sizeof(f->md5));
 569
 570         fd = open(l->avl.key, O_RDONLY);
 571         if (fd < 0)
 572                 return;
 573
 574         md5_begin(&md5);
 575         do {
 576                 len = read(fd, buf, sizeof(buf));
 577                 if (len < 0) {
 578                         if (errno == EINTR)
 579                                 continue;
 580
 581                         break;
 582                 }
 583                 if (!len)
 584                         break;
 585
 586                 md5_hash(buf, len, &md5);
 587         } while(1);
 588
 589         md5_end(f->md5, &md5);
 590         close(fd);
 591 }
 592
 593 static void
 594 instance_fill_any(struct blobmsg_list *l, struct blob_attr *cur)
 595 {
 596         if (!cur)
 597                 return;
 598
 599         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), false);
 600 }
 601
 602 static bool
 603 instance_fill_array(struct blobmsg_list *l, struct blob_attr *cur, blobmsg_update_cb cb, bool array)
 604 {
 605         struct blobmsg_list_node *node;
 606
 607         if (!cur)
 608                 return true;
 609
 610         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 611                 return false;
 612
 613         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), array);
 614         if (cb) {
 615                 blobmsg_list_for_each(l, node)
 616                         cb(node);
 617         }
 618         return true;
 619 }
 620
 621 static int
 622 instance_jail_parse(struct service_instance *in, struct blob_attr *attr)
 623 {
 624         struct blob_attr *tb[__JAIL_ATTR_MAX];
 625         struct jail *jail = &in->jail;
 626         struct stat s;
 627
 628         if (stat("/sbin/ujail", &s))
 629                 return 0;
 630
 631         blobmsg_parse(jail_attr, __JAIL_ATTR_MAX, tb,
 632                 blobmsg_data(attr), blobmsg_data_len(attr));
 633
 634         jail->argc = 2;
 635
 636         if (tb[JAIL_ATTR_NAME]) {
 637                 jail->name = blobmsg_get_string(tb[JAIL_ATTR_NAME]);
 638                 jail->argc += 2;
 639         }
 640         if (tb[JAIL_ATTR_ROOT]) {
 641                 jail->root = blobmsg_get_string(tb[JAIL_ATTR_ROOT]);
 642                 jail->argc += 2;
 643         }
 644         if (tb[JAIL_ATTR_PROCFS]) {
 645                 jail->procfs = blobmsg_get_bool(tb[JAIL_ATTR_PROCFS]);
 646                 jail->argc++;
 647         }
 648         if (tb[JAIL_ATTR_SYSFS]) {
 649                 jail->sysfs = blobmsg_get_bool(tb[JAIL_ATTR_SYSFS]);
 650                 jail->argc++;
 651         }
 652         if (tb[JAIL_ATTR_UBUS]) {
 653                 jail->ubus = blobmsg_get_bool(tb[JAIL_ATTR_UBUS]);
 654                 jail->argc++;
 655         }
 656         if (tb[JAIL_ATTR_LOG]) {
 657                 jail->log = blobmsg_get_bool(tb[JAIL_ATTR_LOG]);
 658                 jail->argc++;
 659         }
 660         if (tb[JAIL_ATTR_MOUNT]) {
 661                 struct blob_attr *cur;
 662                 int rem;
 663
 664                 blobmsg_for_each_attr(cur, tb[JAIL_ATTR_MOUNT], rem)
 665                         jail->argc += 2;
 666                 instance_fill_array(&jail->mount, tb[JAIL_ATTR_MOUNT], NULL, false);
 667         }
 668         if (in->seccomp)
 669                 jail->argc += 2;
 670
 671         return 1;
 672 }
 673
 674 static bool
 675 instance_config_parse(struct service_instance *in)
 676 {
 677         struct blob_attr *tb[__INSTANCE_ATTR_MAX];
 678         struct blob_attr *cur, *cur2;
 679         int argc = 0;
 680         int rem;
 681
 682         blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
 683                 blobmsg_data(in->config), blobmsg_data_len(in->config));
 684
 685         cur = tb[INSTANCE_ATTR_COMMAND];
 686         if (!cur)
 687                 return false;
 688
 689         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 690                 return false;
 691
 692         blobmsg_for_each_attr(cur2, cur, rem) {
 693                 argc++;
 694                 break;
 695         }
 696         if (!argc)
 697                 return false;
 698
 699         in->command = cur;
 700
 701         if (tb[INSTANCE_ATTR_RESPAWN]) {
 702                 int i = 0;
 703                 uint32_t vals[3] = { 3600, 5, 5};
 704
 705                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_RESPAWN], rem) {
 706                         if ((i >= 3) && (blobmsg_type(cur2) == BLOBMSG_TYPE_STRING))
 707                                 continue;
 708                         vals[i] = atoi(blobmsg_get_string(cur2));
 709                         i++;
 710                 }
 711                 in->respawn = true;
 712                 in->respawn_count = 0;
 713                 in->respawn_threshold = vals[0];
 714                 in->respawn_timeout = vals[1];
 715                 in->respawn_retry = vals[2];
 716         }
 717         if (tb[INSTANCE_ATTR_TRIGGER]) {
 718                 in->trigger = tb[INSTANCE_ATTR_TRIGGER];
 719                 trigger_add(in->trigger, in);
 720         }
 721
 722         if (tb[INSTANCE_ATTR_WATCH]) {
 723                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_WATCH], rem) {
 724                         if (blobmsg_type(cur2) != BLOBMSG_TYPE_STRING)
 725                                 continue;
 726                         DEBUG(3, "watch for %s\n", blobmsg_get_string(cur2));
 727                         watch_add(blobmsg_get_string(cur2), in);
 728                 }
 729         }
 730
 731         if ((cur = tb[INSTANCE_ATTR_NICE])) {
 732                 in->nice = (int8_t) blobmsg_get_u32(cur);
 733                 if (in->nice < -20 || in->nice > 20)
 734                         return false;
 735         }
 736
 737         if (tb[INSTANCE_ATTR_USER]) {
 738                 struct passwd *p = getpwnam(blobmsg_get_string(tb[INSTANCE_ATTR_USER]));
 739                 if (p) {
 740                         in->uid = p->pw_uid;
 741                         in->gid = p->pw_gid;
 742                 }
 743         }
 744
 745         if (tb[INSTANCE_ATTR_TRACE])
 746                 in->trace = blobmsg_get_bool(tb[INSTANCE_ATTR_TRACE]);
 747
 748         if (!in->trace && tb[INSTANCE_ATTR_SECCOMP]) {
 749                 char *seccomp = blobmsg_get_string(tb[INSTANCE_ATTR_SECCOMP]);
 750                 struct stat s;
 751
 752                 if (stat(seccomp, &s))
 753                         ERROR("%s: not starting seccomp as %s is missing\n", in->name, seccomp);
 754                 else
 755                         in->seccomp = seccomp;
 756         }
 757         if (!in->trace && tb[INSTANCE_ATTR_JAIL])
 758                 in->has_jail = instance_jail_parse(in, tb[INSTANCE_ATTR_JAIL]);
 759
 760         if (tb[INSTANCE_ATTR_STDOUT] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDOUT]))
 761                 in->_stdout.fd.fd = -1;
 762
 763         if (tb[INSTANCE_ATTR_STDERR] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDERR]))
 764                 in->_stderr.fd.fd = -1;
 765
 766         instance_fill_any(&in->data, tb[INSTANCE_ATTR_DATA]);
 767
 768         if (!instance_fill_array(&in->env, tb[INSTANCE_ATTR_ENV], NULL, false))
 769                 return false;
 770
 771         if (!instance_fill_array(&in->netdev, tb[INSTANCE_ATTR_NETDEV], instance_netdev_update, true))
 772                 return false;
 773
 774         if (!instance_fill_array(&in->file, tb[INSTANCE_ATTR_FILE], instance_file_update, true))
 775                 return false;
 776
 777         if (!instance_fill_array(&in->limits, tb[INSTANCE_ATTR_LIMITS], NULL, false))
 778                 return false;
 779
 780         if (!instance_fill_array(&in->errors, tb[INSTANCE_ATTR_ERROR], NULL, true))
 781                 return false;
 782
 783         return true;
 784 }
 785
 786 static void
 787 instance_config_cleanup(struct service_instance *in)
 788 {
 789         blobmsg_list_free(&in->env);
 790         blobmsg_list_free(&in->data);
 791         blobmsg_list_free(&in->netdev);
 792         blobmsg_list_free(&in->file);
 793         blobmsg_list_free(&in->limits);
 794         blobmsg_list_free(&in->errors);
 795         blobmsg_list_free(&in->jail.mount);
 796 }
 797
 798 static void
 799 instance_config_move(struct service_instance *in, struct service_instance *in_src)
 800 {
 801         instance_config_cleanup(in);
 802         blobmsg_list_move(&in->env, &in_src->env);
 803         blobmsg_list_move(&in->data, &in_src->data);
 804         blobmsg_list_move(&in->netdev, &in_src->netdev);
 805         blobmsg_list_move(&in->file, &in_src->file);
 806         blobmsg_list_move(&in->limits, &in_src->limits);
 807         blobmsg_list_move(&in->errors, &in_src->errors);
 808         blobmsg_list_move(&in->jail.mount, &in_src->jail.mount);
 809         in->trigger = in_src->trigger;
 810         in->command = in_src->command;
 811         in->name = in_src->name;
 812         in->node.avl.key = in_src->node.avl.key;
 813
 814         free(in->config);
 815         in->config = in_src->config;
 816         in_src->config = NULL;
 817 }
 818
 819 bool
 820 instance_update(struct service_instance *in, struct service_instance *in_new)
 821 {
 822         bool changed = instance_config_changed(in, in_new);
 823         bool running = in->proc.pending;
 824
 825         if (!changed && running)
 826                 return false;
 827
 828         if (!running) {
 829                 if (changed)
 830                         instance_config_move(in, in_new);
 831                 instance_start(in);
 832         } else {
 833                 instance_restart(in);
 834                 instance_config_move(in, in_new);
 835                 /* restart happens in the child callback handler */
 836         }
 837         return true;
 838 }
 839
 840 void
 841 instance_free(struct service_instance *in)
 842 {
 843         instance_free_stdio(in);
 844         uloop_process_delete(&in->proc);
 845         uloop_timeout_cancel(&in->timeout);
 846         trigger_del(in);
 847         watch_del(in);
 848         instance_config_cleanup(in);
 849         free(in->config);
 850         free(in);
 851 }
 852
 853 void
 854 instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
 855 {
 856         config = blob_memdup(config);
 857         in->srv = s;
 858         in->name = blobmsg_name(config);
 859         in->config = config;
 860         in->timeout.cb = instance_timeout;
 861         in->proc.cb = instance_exit;
 862
 863         in->_stdout.fd.fd = -2;
 864         in->_stdout.stream.string_data = true;
 865         in->_stdout.stream.notify_read = instance_stdout;
 866
 867         in->_stderr.fd.fd = -2;
 868         in->_stderr.stream.string_data = true;
 869         in->_stderr.stream.notify_read = instance_stderr;
 870
 871         blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
 872         blobmsg_list_init(&in->file, struct instance_file, node, instance_file_cmp);
 873         blobmsg_list_simple_init(&in->env);
 874         blobmsg_list_simple_init(&in->data);
 875         blobmsg_list_simple_init(&in->limits);
 876         blobmsg_list_simple_init(&in->errors);
 877         blobmsg_list_simple_init(&in->jail.mount);
 878         in->valid = instance_config_parse(in);
 879 }
 880
 881 void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
 882 {
 883         void *i;
 884
 885         if (!in->valid)
 886                 return;
 887
 888         i = blobmsg_open_table(b, in->name);
 889         blobmsg_add_u8(b, "running", in->proc.pending);
 890         if (in->proc.pending)
 891                 blobmsg_add_u32(b, "pid", in->proc.pid);
 892         blobmsg_add_blob(b, in->command);
 893
 894         if (!avl_is_empty(&in->errors.avl)) {
 895                 struct blobmsg_list_node *var;
 896                 void *e = blobmsg_open_array(b, "errors");
 897                 blobmsg_list_for_each(&in->errors, var)
 898                         blobmsg_add_string(b, NULL, blobmsg_data(var->data));
 899                 blobmsg_close_table(b, e);
 900         }
 901
 902         if (!avl_is_empty(&in->env.avl)) {
 903                 struct blobmsg_list_node *var;
 904                 void *e = blobmsg_open_table(b, "env");
 905                 blobmsg_list_for_each(&in->env, var)
 906                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
 907                 blobmsg_close_table(b, e);
 908         }
 909
 910         if (!avl_is_empty(&in->data.avl)) {
 911                 struct blobmsg_list_node *var;
 912                 void *e = blobmsg_open_table(b, "data");
 913                 blobmsg_list_for_each(&in->data, var)
 914                         blobmsg_add_blob(b, var->data);
 915                 blobmsg_close_table(b, e);
 916         }
 917
 918         if (!avl_is_empty(&in->limits.avl)) {
 919                 struct blobmsg_list_node *var;
 920                 void *e = blobmsg_open_table(b, "limits");
 921                 blobmsg_list_for_each(&in->limits, var)
 922                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
 923                 blobmsg_close_table(b, e);
 924         }
 925
 926         if (in->respawn) {
 927                 void *r = blobmsg_open_table(b, "respawn");
 928                 blobmsg_add_u32(b, "threshold", in->respawn_threshold);
 929                 blobmsg_add_u32(b, "timeout", in->respawn_timeout);
 930                 blobmsg_add_u32(b, "retry", in->respawn_retry);
 931                 blobmsg_close_table(b, r);
 932         }
 933
 934         if (in->trace)
 935                 blobmsg_add_u8(b, "trace", true);
 936
 937         if (in->seccomp)
 938                 blobmsg_add_string(b, "seccomp", in->seccomp);
 939
 940         if (in->has_jail) {
 941                 void *r = blobmsg_open_table(b, "jail");
 942                 if (in->jail.name)
 943                         blobmsg_add_string(b, "name", in->jail.name);
 944                 if (in->jail.root)
 945                         blobmsg_add_string(b, "root", in->jail.root);
 946                 blobmsg_add_u8(b, "procfs", in->jail.procfs);
 947                 blobmsg_add_u8(b, "sysfs", in->jail.sysfs);
 948                 blobmsg_add_u8(b, "ubus", in->jail.ubus);
 949                 blobmsg_add_u8(b, "log", in->jail.log);
 950                 blobmsg_close_table(b, r);
 951                 if (!avl_is_empty(&in->jail.mount.avl)) {
 952                         struct blobmsg_list_node *var;
 953                         void *e = blobmsg_open_table(b, "mount");
 954                         blobmsg_list_for_each(&in->jail.mount, var)
 955                                 blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
 956                         blobmsg_close_table(b, e);
 957                 }
 958         }
 959
 960         if (verbose && in->trigger)
 961                 blobmsg_add_blob(b, in->trigger);
 962
 963         blobmsg_close_table(b, i);
 964 }