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