service/instance.c

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