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_PIDFILE,
  57         INSTANCE_ATTR_RELOADSIG,
  58         INSTANCE_ATTR_TERMTIMEOUT,
  59         __INSTANCE_ATTR_MAX
  60 };
  61
  62 static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = {
  63         [INSTANCE_ATTR_COMMAND] = { "command", BLOBMSG_TYPE_ARRAY },
  64         [INSTANCE_ATTR_ENV] = { "env", BLOBMSG_TYPE_TABLE },
  65         [INSTANCE_ATTR_DATA] = { "data", BLOBMSG_TYPE_TABLE },
  66         [INSTANCE_ATTR_NETDEV] = { "netdev", BLOBMSG_TYPE_ARRAY },
  67         [INSTANCE_ATTR_FILE] = { "file", BLOBMSG_TYPE_ARRAY },
  68         [INSTANCE_ATTR_TRIGGER] = { "triggers", BLOBMSG_TYPE_ARRAY },
  69         [INSTANCE_ATTR_RESPAWN] = { "respawn", BLOBMSG_TYPE_ARRAY },
  70         [INSTANCE_ATTR_NICE] = { "nice", BLOBMSG_TYPE_INT32 },
  71         [INSTANCE_ATTR_LIMITS] = { "limits", BLOBMSG_TYPE_TABLE },
  72         [INSTANCE_ATTR_WATCH] = { "watch", BLOBMSG_TYPE_ARRAY },
  73         [INSTANCE_ATTR_ERROR] = { "error", BLOBMSG_TYPE_ARRAY },
  74         [INSTANCE_ATTR_USER] = { "user", BLOBMSG_TYPE_STRING },
  75         [INSTANCE_ATTR_STDOUT] = { "stdout", BLOBMSG_TYPE_BOOL },
  76         [INSTANCE_ATTR_STDERR] = { "stderr", BLOBMSG_TYPE_BOOL },
  77         [INSTANCE_ATTR_NO_NEW_PRIVS] = { "no_new_privs", BLOBMSG_TYPE_BOOL },
  78         [INSTANCE_ATTR_JAIL] = { "jail", BLOBMSG_TYPE_TABLE },
  79         [INSTANCE_ATTR_TRACE] = { "trace", BLOBMSG_TYPE_BOOL },
  80         [INSTANCE_ATTR_SECCOMP] = { "seccomp", BLOBMSG_TYPE_STRING },
  81         [INSTANCE_ATTR_PIDFILE] = { "pidfile", BLOBMSG_TYPE_STRING },
  82         [INSTANCE_ATTR_RELOADSIG] = { "reload_signal", BLOBMSG_TYPE_INT32 },
  83         [INSTANCE_ATTR_TERMTIMEOUT] = { "term_timeout", BLOBMSG_TYPE_INT32 },
  84 };
  85
  86 enum {
  87         JAIL_ATTR_NAME,
  88         JAIL_ATTR_HOSTNAME,
  89         JAIL_ATTR_PROCFS,
  90         JAIL_ATTR_SYSFS,
  91         JAIL_ATTR_UBUS,
  92         JAIL_ATTR_LOG,
  93         JAIL_ATTR_RONLY,
  94         JAIL_ATTR_MOUNT,
  95         __JAIL_ATTR_MAX,
  96 };
  97
  98 static const struct blobmsg_policy jail_attr[__JAIL_ATTR_MAX] = {
  99         [JAIL_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 100         [JAIL_ATTR_HOSTNAME] = { "hostname", BLOBMSG_TYPE_STRING },
 101         [JAIL_ATTR_PROCFS] = { "procfs", BLOBMSG_TYPE_BOOL },
 102         [JAIL_ATTR_SYSFS] = { "sysfs", BLOBMSG_TYPE_BOOL },
 103         [JAIL_ATTR_UBUS] = { "ubus", BLOBMSG_TYPE_BOOL },
 104         [JAIL_ATTR_LOG] = { "log", BLOBMSG_TYPE_BOOL },
 105         [JAIL_ATTR_RONLY] = { "ronly", BLOBMSG_TYPE_BOOL },
 106         [JAIL_ATTR_MOUNT] = { "mount", BLOBMSG_TYPE_TABLE },
 107 };
 108
 109 struct instance_netdev {
 110         struct blobmsg_list_node node;
 111         int ifindex;
 112 };
 113
 114 struct instance_file {
 115         struct blobmsg_list_node node;
 116         uint32_t md5[4];
 117 };
 118
 119 struct rlimit_name {
 120         const char *name;
 121         int resource;
 122 };
 123
 124 static const struct rlimit_name rlimit_names[] = {
 125         { "as", RLIMIT_AS },
 126         { "core", RLIMIT_CORE },
 127         { "cpu", RLIMIT_CPU },
 128         { "data", RLIMIT_DATA },
 129         { "fsize", RLIMIT_FSIZE },
 130         { "memlock", RLIMIT_MEMLOCK },
 131         { "nofile", RLIMIT_NOFILE },
 132         { "nproc", RLIMIT_NPROC },
 133         { "rss", RLIMIT_RSS },
 134         { "stack", RLIMIT_STACK },
 135 #ifdef linux
 136         { "nice", RLIMIT_NICE },
 137         { "rtprio", RLIMIT_RTPRIO },
 138         { "msgqueue", RLIMIT_MSGQUEUE },
 139         { "sigpending", RLIMIT_SIGPENDING },
 140 #endif
 141         { NULL, 0 }
 142 };
 143
 144 static char trace[] = "/sbin/utrace";
 145
 146 static void closefd(int fd)
 147 {
 148         if (fd > STDERR_FILENO)
 149                 close(fd);
 150 }
 151
 152 static void
 153 instance_limits(const char *limit, const char *value)
 154 {
 155         int i;
 156         struct rlimit rlim;
 157         unsigned long cur, max;
 158
 159         for (i = 0; rlimit_names[i].name != NULL; i++) {
 160                 if (strcmp(rlimit_names[i].name, limit))
 161                         continue;
 162                 if (!strcmp(value, "unlimited")) {
 163                         rlim.rlim_cur = RLIM_INFINITY;
 164                         rlim.rlim_max = RLIM_INFINITY;
 165                 } else {
 166                         if (getrlimit(rlimit_names[i].resource, &rlim))
 167                                 return;
 168
 169                         cur = rlim.rlim_cur;
 170                         max = rlim.rlim_max;
 171
 172                         if (sscanf(value, "%lu %lu", &cur, &max) < 1)
 173                                 return;
 174
 175                         rlim.rlim_cur = cur;
 176                         rlim.rlim_max = max;
 177                 }
 178
 179                 setrlimit(rlimit_names[i].resource, &rlim);
 180                 return;
 181         }
 182 }
 183
 184 static inline int
 185 jail_run(struct service_instance *in, char **argv)
 186 {
 187         struct blobmsg_list_node *var;
 188         struct jail *jail = &in->jail;
 189         int argc = 0;
 190
 191         argv[argc++] = "/sbin/ujail";
 192
 193         if (jail->name) {
 194                 argv[argc++] = "-n";
 195                 argv[argc++] = jail->name;
 196         }
 197
 198         if (jail->hostname) {
 199                 argv[argc++] = "-h";
 200                 argv[argc++] = jail->hostname;
 201         }
 202
 203         if (in->seccomp) {
 204                 argv[argc++] = "-S";
 205                 argv[argc++] = in->seccomp;
 206         }
 207
 208         if (in->no_new_privs)
 209                 argv[argc++] = "-c";
 210
 211         if (jail->procfs)
 212                 argv[argc++] = "-p";
 213
 214         if (jail->sysfs)
 215                 argv[argc++] = "-s";
 216
 217         if (jail->ubus)
 218                 argv[argc++] = "-u";
 219
 220         if (jail->log)
 221                 argv[argc++] = "-l";
 222
 223         if (jail->ronly)
 224                 argv[argc++] = "-o";
 225
 226         blobmsg_list_for_each(&jail->mount, var) {
 227                 const char *type = blobmsg_data(var->data);
 228
 229                 if (*type == '1')
 230                         argv[argc++] = "-w";
 231                 else
 232                         argv[argc++] = "-r";
 233                 argv[argc++] = (char *) blobmsg_name(var->data);
 234         }
 235
 236         argv[argc++] = "--";
 237
 238         return argc;
 239 }
 240
 241 static int
 242 instance_removepid(struct service_instance *in) {
 243         if (!in->pidfile)
 244                 return 0;
 245         if (unlink(in->pidfile)) {
 246                 ERROR("Failed to removed pidfile: %s: %d - %s\n",
 247                         in->pidfile, errno, strerror(errno));
 248                 return 1;
 249         }
 250         return 0;
 251 }
 252
 253 static int
 254 instance_writepid(struct service_instance *in)
 255 {
 256         FILE *_pidfile;
 257
 258         if (!in->pidfile) {
 259                 return 0;
 260         }
 261         _pidfile = fopen(in->pidfile, "w");
 262         if (_pidfile == NULL) {
 263                 ERROR("failed to open pidfile for writing: %s: %d (%s)",
 264                         in->pidfile, errno, strerror(errno));
 265                 return 1;
 266         }
 267         if (fprintf(_pidfile, "%d\n", in->proc.pid) < 0) {
 268                 ERROR("failed to write pidfile: %s: %d (%s)",
 269                         in->pidfile, errno, strerror(errno));
 270                 fclose(_pidfile);
 271                 return 2;
 272         }
 273         if (fclose(_pidfile)) {
 274                 ERROR("failed to close pidfile: %s: %d (%s)",
 275                         in->pidfile, errno, strerror(errno));
 276                 return 3;
 277         }
 278
 279         return 0;
 280 }
 281
 282 static void
 283 instance_run(struct service_instance *in, int _stdout, int _stderr)
 284 {
 285         struct blobmsg_list_node *var;
 286         struct blob_attr *cur;
 287         char **argv;
 288         char *ld_preload;
 289         int argc = 1; /* NULL terminated */
 290         int rem, _stdin;
 291         bool seccomp = !in->trace && !in->has_jail && in->seccomp;
 292         bool setlbf = _stdout >= 0;
 293
 294         if (in->nice)
 295                 setpriority(PRIO_PROCESS, 0, in->nice);
 296
 297         blobmsg_for_each_attr(cur, in->command, rem)
 298                 argc++;
 299
 300         blobmsg_list_for_each(&in->env, var)
 301                 setenv(blobmsg_name(var->data), blobmsg_data(var->data), 1);
 302
 303         if (seccomp)
 304                 setenv("SECCOMP_FILE", in->seccomp, 1);
 305
 306         if ((seccomp || setlbf) && asprintf(&ld_preload, "LD_PRELOAD=%s%s%s",
 307                         seccomp ? "/lib/libpreload-seccomp.so" : "",
 308                         seccomp && setlbf ? ":" : "",
 309                         setlbf ? "/lib/libsetlbf.so" : "") > 0)
 310                 putenv(ld_preload);
 311
 312         blobmsg_list_for_each(&in->limits, var)
 313                 instance_limits(blobmsg_name(var->data), blobmsg_data(var->data));
 314
 315         if (in->trace)
 316                 argc += 1;
 317
 318         argv = alloca(sizeof(char *) * (argc + in->jail.argc));
 319         argc = 0;
 320
 321         if (in->trace)
 322                 argv[argc++] = trace;
 323
 324         if (in->has_jail)
 325                 argc = jail_run(in, argv);
 326
 327         blobmsg_for_each_attr(cur, in->command, rem)
 328                 argv[argc++] = blobmsg_data(cur);
 329
 330         argv[argc] = NULL;
 331
 332         _stdin = open("/dev/null", O_RDONLY);
 333
 334         if (_stdout == -1)
 335                 _stdout = open("/dev/null", O_WRONLY);
 336
 337         if (_stderr == -1)
 338                 _stderr = open("/dev/null", O_WRONLY);
 339
 340         if (_stdin > -1) {
 341                 dup2(_stdin, STDIN_FILENO);
 342                 closefd(_stdin);
 343         }
 344         if (_stdout > -1) {
 345                 dup2(_stdout, STDOUT_FILENO);
 346                 closefd(_stdout);
 347         }
 348         if (_stderr > -1) {
 349                 dup2(_stderr, STDERR_FILENO);
 350                 closefd(_stderr);
 351         }
 352
 353         if (in->gid && setgid(in->gid)) {
 354                 ERROR("failed to set group id %d: %d (%s)\n", in->gid, errno, strerror(errno));
 355                 exit(127);
 356         }
 357         if (in->uid && setuid(in->uid)) {
 358                 ERROR("failed to set user id %d: %d (%s)\n", in->uid, errno, strerror(errno));
 359                 exit(127);
 360         }
 361
 362         execvp(argv[0], argv);
 363         exit(127);
 364 }
 365
 366 static void
 367 instance_free_stdio(struct service_instance *in)
 368 {
 369         if (in->_stdout.fd.fd > -1) {
 370                 ustream_free(&in->_stdout.stream);
 371                 close(in->_stdout.fd.fd);
 372                 in->_stdout.fd.fd = -1;
 373         }
 374
 375         if (in->_stderr.fd.fd > -1) {
 376                 ustream_free(&in->_stderr.stream);
 377                 close(in->_stderr.fd.fd);
 378                 in->_stderr.fd.fd = -1;
 379         }
 380 }
 381
 382 void
 383 instance_start(struct service_instance *in)
 384 {
 385         int pid;
 386         int opipe[2] = { -1, -1 };
 387         int epipe[2] = { -1, -1 };
 388
 389         if (!avl_is_empty(&in->errors.avl)) {
 390                 LOG("Not starting instance %s::%s, an error was indicated\n", in->srv->name, in->name);
 391                 return;
 392         }
 393
 394         if (!in->command) {
 395                 LOG("Not starting instance %s::%s, command not set\n", in->srv->name, in->name);
 396                 return;
 397         }
 398
 399         if (in->proc.pending) {
 400                 if (in->halt)
 401                         in->restart = true;
 402                 return;
 403         }
 404
 405         instance_free_stdio(in);
 406         if (in->_stdout.fd.fd > -2) {
 407                 if (pipe(opipe)) {
 408                         ULOG_WARN("pipe() failed: %d (%s)\n", errno, strerror(errno));
 409                         opipe[0] = opipe[1] = -1;
 410                 }
 411         }
 412
 413         if (in->_stderr.fd.fd > -2) {
 414                 if (pipe(epipe)) {
 415                         ULOG_WARN("pipe() failed: %d (%s)\n", errno, strerror(errno));
 416                         epipe[0] = epipe[1] = -1;
 417                 }
 418         }
 419
 420         in->restart = false;
 421         in->halt = false;
 422
 423         if (!in->valid)
 424                 return;
 425
 426         pid = fork();
 427         if (pid < 0)
 428                 return;
 429
 430         if (!pid) {
 431                 uloop_done();
 432                 closefd(opipe[0]);
 433                 closefd(epipe[0]);
 434                 instance_run(in, opipe[1], epipe[1]);
 435                 return;
 436         }
 437
 438         DEBUG(2, "Started instance %s::%s[%d]\n", in->srv->name, in->name, pid);
 439         in->proc.pid = pid;
 440         instance_writepid(in);
 441         clock_gettime(CLOCK_MONOTONIC, &in->start);
 442         uloop_process_add(&in->proc);
 443
 444         if (opipe[0] > -1) {
 445                 ustream_fd_init(&in->_stdout, opipe[0]);
 446                 closefd(opipe[1]);
 447         }
 448
 449         if (epipe[0] > -1) {
 450                 ustream_fd_init(&in->_stderr, epipe[0]);
 451                 closefd(epipe[1]);
 452         }
 453
 454         service_event("instance.start", in->srv->name, in->name);
 455 }
 456
 457 static void
 458 instance_stdio(struct ustream *s, int prio, struct service_instance *in)
 459 {
 460         char *newline, *str, *arg0, ident[32];
 461         int len;
 462
 463         arg0 = basename(blobmsg_data(blobmsg_data(in->command)));
 464         snprintf(ident, sizeof(ident), "%s[%d]", arg0, in->proc.pid);
 465         ulog_open(ULOG_SYSLOG, LOG_DAEMON, ident);
 466
 467         do {
 468                 str = ustream_get_read_buf(s, NULL);
 469                 if (!str)
 470                         break;
 471
 472                 newline = strchr(str, '\n');
 473                 if (!newline)
 474                         break;
 475
 476                 *newline = 0;
 477                 ulog(prio, "%s\n", str);
 478
 479                 len = newline + 1 - str;
 480                 ustream_consume(s, len);
 481         } while (1);
 482
 483         ulog_open(ULOG_SYSLOG, LOG_DAEMON, "procd");
 484 }
 485
 486 static void
 487 instance_stdout(struct ustream *s, int bytes)
 488 {
 489         instance_stdio(s, LOG_INFO,
 490                        container_of(s, struct service_instance, _stdout.stream));
 491 }
 492
 493 static void
 494 instance_stderr(struct ustream *s, int bytes)
 495 {
 496         instance_stdio(s, LOG_ERR,
 497                        container_of(s, struct service_instance, _stderr.stream));
 498 }
 499
 500 static void
 501 instance_timeout(struct uloop_timeout *t)
 502 {
 503         struct service_instance *in;
 504
 505         in = container_of(t, struct service_instance, timeout);
 506
 507         if (in->halt) {
 508                 LOG("Instance %s::%s pid %d not stopped on SIGTERM, sending SIGKILL instead\n",
 509                                 in->srv->name, in->name, in->proc.pid);
 510                 kill(in->proc.pid, SIGKILL);
 511         } else if (in->restart || in->respawn)
 512                 instance_start(in);
 513 }
 514
 515 static void
 516 instance_exit(struct uloop_process *p, int ret)
 517 {
 518         struct service_instance *in;
 519         struct timespec tp;
 520         long runtime;
 521
 522         in = container_of(p, struct service_instance, proc);
 523
 524         clock_gettime(CLOCK_MONOTONIC, &tp);
 525         runtime = tp.tv_sec - in->start.tv_sec;
 526
 527         DEBUG(2, "Instance %s::%s exit with error code %d after %ld seconds\n", in->srv->name, in->name, ret, runtime);
 528
 529         uloop_timeout_cancel(&in->timeout);
 530         service_event("instance.stop", in->srv->name, in->name);
 531
 532         if (in->halt) {
 533                 instance_removepid(in);
 534                 if (in->restart)
 535                         instance_start(in);
 536                 else {
 537                         struct service *s = in->srv;
 538
 539                         avl_delete(&s->instances.avl, &in->node.avl);
 540                         instance_free(in);
 541                         service_stopped(s);
 542                 }
 543         } else if (in->restart) {
 544                 instance_start(in);
 545         } else if (in->respawn) {
 546                 if (runtime < in->respawn_threshold)
 547                         in->respawn_count++;
 548                 else
 549                         in->respawn_count = 0;
 550                 if (in->respawn_count > in->respawn_retry && in->respawn_retry > 0 ) {
 551                         LOG("Instance %s::%s s in a crash loop %d crashes, %ld seconds since last crash\n",
 552                                                                 in->srv->name, in->name, in->respawn_count, runtime);
 553                         in->restart = in->respawn = 0;
 554                         in->halt = 1;
 555                         service_event("instance.fail", in->srv->name, in->name);
 556                 } else {
 557                         service_event("instance.respawn", in->srv->name, in->name);
 558                         uloop_timeout_set(&in->timeout, in->respawn_timeout * 1000);
 559                 }
 560         }
 561 }
 562
 563 void
 564 instance_stop(struct service_instance *in, bool halt)
 565 {
 566         if (!in->proc.pending)
 567                 return;
 568         in->halt = halt;
 569         in->restart = in->respawn = false;
 570         kill(in->proc.pid, SIGTERM);
 571         uloop_timeout_set(&in->timeout, in->term_timeout * 1000);
 572 }
 573
 574 static void
 575 instance_restart(struct service_instance *in)
 576 {
 577         if (!in->proc.pending)
 578                 return;
 579
 580         if (in->reload_signal) {
 581                 kill(in->proc.pid, in->reload_signal);
 582                 return;
 583         }
 584
 585         in->halt = true;
 586         in->restart = true;
 587         kill(in->proc.pid, SIGTERM);
 588         uloop_timeout_set(&in->timeout, in->term_timeout * 1000);
 589 }
 590
 591 static bool
 592 instance_config_changed(struct service_instance *in, struct service_instance *in_new)
 593 {
 594         if (!in->valid)
 595                 return true;
 596
 597         if (!blob_attr_equal(in->command, in_new->command))
 598                 return true;
 599
 600         if (!blobmsg_list_equal(&in->env, &in_new->env))
 601                 return true;
 602
 603         if (!blobmsg_list_equal(&in->netdev, &in_new->netdev))
 604                 return true;
 605
 606         if (!blobmsg_list_equal(&in->file, &in_new->file))
 607                 return true;
 608
 609         if (in->nice != in_new->nice)
 610                 return true;
 611
 612         if (in->uid != in_new->uid)
 613                 return true;
 614
 615         if (in->gid != in_new->gid)
 616                 return true;
 617
 618         if (in->pidfile && in_new->pidfile)
 619                 if (strcmp(in->pidfile, in_new->pidfile))
 620                         return true;
 621
 622         if (in->pidfile && !in_new->pidfile)
 623                 return true;
 624
 625         if (!in->pidfile && in_new->pidfile)
 626                 return true;
 627
 628         if (!blobmsg_list_equal(&in->limits, &in_new->limits))
 629                 return true;
 630
 631         if (!blobmsg_list_equal(&in->jail.mount, &in_new->jail.mount))
 632                 return true;
 633
 634         if (!blobmsg_list_equal(&in->errors, &in_new->errors))
 635                 return true;
 636
 637         return false;
 638 }
 639
 640 static bool
 641 instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 642 {
 643         struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
 644         struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
 645
 646         return n1->ifindex == n2->ifindex;
 647 }
 648
 649 static void
 650 instance_netdev_update(struct blobmsg_list_node *l)
 651 {
 652         struct instance_netdev *n = container_of(l, struct instance_netdev, node);
 653
 654         n->ifindex = if_nametoindex(n->node.avl.key);
 655 }
 656
 657 static bool
 658 instance_file_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 659 {
 660         struct instance_file *f1 = container_of(l1, struct instance_file, node);
 661         struct instance_file *f2 = container_of(l2, struct instance_file, node);
 662
 663         return !memcmp(f1->md5, f2->md5, sizeof(f1->md5));
 664 }
 665
 666 static void
 667 instance_file_update(struct blobmsg_list_node *l)
 668 {
 669         struct instance_file *f = container_of(l, struct instance_file, node);
 670         md5_ctx_t md5;
 671         char buf[256];
 672         int len, fd;
 673
 674         memset(f->md5, 0, sizeof(f->md5));
 675
 676         fd = open(l->avl.key, O_RDONLY);
 677         if (fd < 0)
 678                 return;
 679
 680         md5_begin(&md5);
 681         do {
 682                 len = read(fd, buf, sizeof(buf));
 683                 if (len < 0) {
 684                         if (errno == EINTR)
 685                                 continue;
 686
 687                         break;
 688                 }
 689                 if (!len)
 690                         break;
 691
 692                 md5_hash(buf, len, &md5);
 693         } while(1);
 694
 695         md5_end(f->md5, &md5);
 696         close(fd);
 697 }
 698
 699 static void
 700 instance_fill_any(struct blobmsg_list *l, struct blob_attr *cur)
 701 {
 702         if (!cur)
 703                 return;
 704
 705         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), false);
 706 }
 707
 708 static bool
 709 instance_fill_array(struct blobmsg_list *l, struct blob_attr *cur, blobmsg_update_cb cb, bool array)
 710 {
 711         struct blobmsg_list_node *node;
 712
 713         if (!cur)
 714                 return true;
 715
 716         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 717                 return false;
 718
 719         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), array);
 720         if (cb) {
 721                 blobmsg_list_for_each(l, node)
 722                         cb(node);
 723         }
 724         return true;
 725 }
 726
 727 static int
 728 instance_jail_parse(struct service_instance *in, struct blob_attr *attr)
 729 {
 730         struct blob_attr *tb[__JAIL_ATTR_MAX];
 731         struct jail *jail = &in->jail;
 732         struct stat s;
 733
 734         if (stat("/sbin/ujail", &s))
 735                 return 0;
 736
 737         blobmsg_parse(jail_attr, __JAIL_ATTR_MAX, tb,
 738                 blobmsg_data(attr), blobmsg_data_len(attr));
 739
 740         jail->argc = 2;
 741
 742         if (tb[JAIL_ATTR_NAME]) {
 743                 jail->name = blobmsg_get_string(tb[JAIL_ATTR_NAME]);
 744                 jail->argc += 2;
 745         }
 746         if (tb[JAIL_ATTR_HOSTNAME]) {
 747                 jail->hostname = blobmsg_get_string(tb[JAIL_ATTR_HOSTNAME]);
 748                 jail->argc += 2;
 749         }
 750         if (tb[JAIL_ATTR_PROCFS]) {
 751                 jail->procfs = blobmsg_get_bool(tb[JAIL_ATTR_PROCFS]);
 752                 jail->argc++;
 753         }
 754         if (tb[JAIL_ATTR_SYSFS]) {
 755                 jail->sysfs = blobmsg_get_bool(tb[JAIL_ATTR_SYSFS]);
 756                 jail->argc++;
 757         }
 758         if (tb[JAIL_ATTR_UBUS]) {
 759                 jail->ubus = blobmsg_get_bool(tb[JAIL_ATTR_UBUS]);
 760                 jail->argc++;
 761         }
 762         if (tb[JAIL_ATTR_LOG]) {
 763                 jail->log = blobmsg_get_bool(tb[JAIL_ATTR_LOG]);
 764                 jail->argc++;
 765         }
 766         if (tb[JAIL_ATTR_RONLY]) {
 767                 jail->ronly = blobmsg_get_bool(tb[JAIL_ATTR_RONLY]);
 768                 jail->argc++;
 769         }
 770         if (tb[JAIL_ATTR_MOUNT]) {
 771                 struct blob_attr *cur;
 772                 int rem;
 773
 774                 blobmsg_for_each_attr(cur, tb[JAIL_ATTR_MOUNT], rem)
 775                         jail->argc += 2;
 776                 instance_fill_array(&jail->mount, tb[JAIL_ATTR_MOUNT], NULL, false);
 777         }
 778         if (in->seccomp)
 779                 jail->argc += 2;
 780
 781         return 1;
 782 }
 783
 784 static bool
 785 instance_config_parse_command(struct service_instance *in, struct blob_attr **tb)
 786 {
 787         struct blob_attr *cur, *cur2;
 788         bool ret = false;
 789         int rem;
 790
 791         cur = tb[INSTANCE_ATTR_COMMAND];
 792         if (!cur) {
 793                 in->command = NULL;
 794                 return true;
 795         }
 796
 797         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 798                 return false;
 799
 800         blobmsg_for_each_attr(cur2, cur, rem) {
 801                 ret = true;
 802                 break;
 803         }
 804
 805         in->command = cur;
 806         return ret;
 807 }
 808
 809 static bool
 810 instance_config_parse(struct service_instance *in)
 811 {
 812         struct blob_attr *tb[__INSTANCE_ATTR_MAX];
 813         struct blob_attr *cur, *cur2;
 814         int rem;
 815
 816         blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
 817                 blobmsg_data(in->config), blobmsg_data_len(in->config));
 818
 819         if (!instance_config_parse_command(in, tb))
 820                 return false;
 821
 822         if (tb[INSTANCE_ATTR_TERMTIMEOUT])
 823                 in->term_timeout = blobmsg_get_u32(tb[INSTANCE_ATTR_TERMTIMEOUT]);
 824         if (tb[INSTANCE_ATTR_RESPAWN]) {
 825                 int i = 0;
 826                 uint32_t vals[3] = { 3600, 5, 5};
 827
 828                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_RESPAWN], rem) {
 829                         if ((i >= 3) && (blobmsg_type(cur2) == BLOBMSG_TYPE_STRING))
 830                                 continue;
 831                         vals[i] = atoi(blobmsg_get_string(cur2));
 832                         i++;
 833                 }
 834                 in->respawn = true;
 835                 in->respawn_count = 0;
 836                 in->respawn_threshold = vals[0];
 837                 in->respawn_timeout = vals[1];
 838                 in->respawn_retry = vals[2];
 839         }
 840         if (tb[INSTANCE_ATTR_TRIGGER]) {
 841                 in->trigger = tb[INSTANCE_ATTR_TRIGGER];
 842                 trigger_add(in->trigger, in);
 843         }
 844
 845         if (tb[INSTANCE_ATTR_WATCH]) {
 846                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_WATCH], rem) {
 847                         if (blobmsg_type(cur2) != BLOBMSG_TYPE_STRING)
 848                                 continue;
 849                         DEBUG(3, "watch for %s\n", blobmsg_get_string(cur2));
 850                         watch_add(blobmsg_get_string(cur2), in);
 851                 }
 852         }
 853
 854         if ((cur = tb[INSTANCE_ATTR_NICE])) {
 855                 in->nice = (int8_t) blobmsg_get_u32(cur);
 856                 if (in->nice < -20 || in->nice > 20)
 857                         return false;
 858         }
 859
 860         if (tb[INSTANCE_ATTR_USER]) {
 861                 struct passwd *p = getpwnam(blobmsg_get_string(tb[INSTANCE_ATTR_USER]));
 862                 if (p) {
 863                         in->uid = p->pw_uid;
 864                         in->gid = p->pw_gid;
 865                 }
 866         }
 867
 868         if (tb[INSTANCE_ATTR_TRACE])
 869                 in->trace = blobmsg_get_bool(tb[INSTANCE_ATTR_TRACE]);
 870
 871         if (tb[INSTANCE_ATTR_NO_NEW_PRIVS])
 872                 in->no_new_privs = blobmsg_get_bool(tb[INSTANCE_ATTR_NO_NEW_PRIVS]);
 873
 874         if (!in->trace && tb[INSTANCE_ATTR_SECCOMP]) {
 875                 char *seccomp = blobmsg_get_string(tb[INSTANCE_ATTR_SECCOMP]);
 876                 struct stat s;
 877
 878                 if (stat(seccomp, &s))
 879                         ERROR("%s: not starting seccomp as %s is missing\n", in->name, seccomp);
 880                 else
 881                         in->seccomp = seccomp;
 882         }
 883
 884         if (tb[INSTANCE_ATTR_PIDFILE]) {
 885                 char *pidfile = blobmsg_get_string(tb[INSTANCE_ATTR_PIDFILE]);
 886                 if (pidfile)
 887                         in->pidfile = pidfile;
 888         }
 889
 890         if (tb[INSTANCE_ATTR_RELOADSIG])
 891                 in->reload_signal = blobmsg_get_u32(tb[INSTANCE_ATTR_RELOADSIG]);
 892
 893         if (!in->trace && tb[INSTANCE_ATTR_JAIL])
 894                 in->has_jail = instance_jail_parse(in, tb[INSTANCE_ATTR_JAIL]);
 895
 896         if (tb[INSTANCE_ATTR_STDOUT] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDOUT]))
 897                 in->_stdout.fd.fd = -1;
 898
 899         if (tb[INSTANCE_ATTR_STDERR] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDERR]))
 900                 in->_stderr.fd.fd = -1;
 901
 902         instance_fill_any(&in->data, tb[INSTANCE_ATTR_DATA]);
 903
 904         if (!instance_fill_array(&in->env, tb[INSTANCE_ATTR_ENV], NULL, false))
 905                 return false;
 906
 907         if (!instance_fill_array(&in->netdev, tb[INSTANCE_ATTR_NETDEV], instance_netdev_update, true))
 908                 return false;
 909
 910         if (!instance_fill_array(&in->file, tb[INSTANCE_ATTR_FILE], instance_file_update, true))
 911                 return false;
 912
 913         if (!instance_fill_array(&in->limits, tb[INSTANCE_ATTR_LIMITS], NULL, false))
 914                 return false;
 915
 916         if (!instance_fill_array(&in->errors, tb[INSTANCE_ATTR_ERROR], NULL, true))
 917                 return false;
 918
 919         return true;
 920 }
 921
 922 static void
 923 instance_config_cleanup(struct service_instance *in)
 924 {
 925         blobmsg_list_free(&in->env);
 926         blobmsg_list_free(&in->data);
 927         blobmsg_list_free(&in->netdev);
 928         blobmsg_list_free(&in->file);
 929         blobmsg_list_free(&in->limits);
 930         blobmsg_list_free(&in->errors);
 931         blobmsg_list_free(&in->jail.mount);
 932 }
 933
 934 static void
 935 instance_config_move(struct service_instance *in, struct service_instance *in_src)
 936 {
 937         instance_config_cleanup(in);
 938         blobmsg_list_move(&in->env, &in_src->env);
 939         blobmsg_list_move(&in->data, &in_src->data);
 940         blobmsg_list_move(&in->netdev, &in_src->netdev);
 941         blobmsg_list_move(&in->file, &in_src->file);
 942         blobmsg_list_move(&in->limits, &in_src->limits);
 943         blobmsg_list_move(&in->errors, &in_src->errors);
 944         blobmsg_list_move(&in->jail.mount, &in_src->jail.mount);
 945         in->trigger = in_src->trigger;
 946         in->command = in_src->command;
 947         in->pidfile = in_src->pidfile;
 948         in->name = in_src->name;
 949         in->node.avl.key = in_src->node.avl.key;
 950
 951         free(in->config);
 952         in->config = in_src->config;
 953         in_src->config = NULL;
 954 }
 955
 956 void
 957 instance_update(struct service_instance *in, struct service_instance *in_new)
 958 {
 959         bool changed = instance_config_changed(in, in_new);
 960         bool running = in->proc.pending;
 961         bool stopping = in->halt;
 962
 963         if (!running || stopping) {
 964                 instance_config_move(in, in_new);
 965                 instance_start(in);
 966         } else {
 967                 if (changed)
 968                         instance_restart(in);
 969                 instance_config_move(in, in_new);
 970                 /* restart happens in the child callback handler */
 971         }
 972 }
 973
 974 void
 975 instance_free(struct service_instance *in)
 976 {
 977         instance_free_stdio(in);
 978         uloop_process_delete(&in->proc);
 979         uloop_timeout_cancel(&in->timeout);
 980         trigger_del(in);
 981         watch_del(in);
 982         instance_config_cleanup(in);
 983         free(in->config);
 984         free(in);
 985 }
 986
 987 void
 988 instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
 989 {
 990         config = blob_memdup(config);
 991         in->srv = s;
 992         in->name = blobmsg_name(config);
 993         in->config = config;
 994         in->timeout.cb = instance_timeout;
 995         in->proc.cb = instance_exit;
 996         in->term_timeout = 5;
 997
 998         in->_stdout.fd.fd = -2;
 999         in->_stdout.stream.string_data = true;
1000         in->_stdout.stream.notify_read = instance_stdout;
1001
1002         in->_stderr.fd.fd = -2;
1003         in->_stderr.stream.string_data = true;
1004         in->_stderr.stream.notify_read = instance_stderr;
1005
1006         blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
1007         blobmsg_list_init(&in->file, struct instance_file, node, instance_file_cmp);
1008         blobmsg_list_simple_init(&in->env);
1009         blobmsg_list_simple_init(&in->data);
1010         blobmsg_list_simple_init(&in->limits);
1011         blobmsg_list_simple_init(&in->errors);
1012         blobmsg_list_simple_init(&in->jail.mount);
1013         in->valid = instance_config_parse(in);
1014 }
1015
1016 void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
1017 {
1018         void *i;
1019
1020         if (!in->valid)
1021                 return;
1022
1023         i = blobmsg_open_table(b, in->name);
1024         blobmsg_add_u8(b, "running", in->proc.pending);
1025         if (in->proc.pending)
1026                 blobmsg_add_u32(b, "pid", in->proc.pid);
1027         if (in->command)
1028                 blobmsg_add_blob(b, in->command);
1029         blobmsg_add_u32(b, "term_timeout", in->term_timeout);
1030
1031         if (!avl_is_empty(&in->errors.avl)) {
1032                 struct blobmsg_list_node *var;
1033                 void *e = blobmsg_open_array(b, "errors");
1034                 blobmsg_list_for_each(&in->errors, var)
1035                         blobmsg_add_string(b, NULL, blobmsg_data(var->data));
1036                 blobmsg_close_table(b, e);
1037         }
1038
1039         if (!avl_is_empty(&in->env.avl)) {
1040                 struct blobmsg_list_node *var;
1041                 void *e = blobmsg_open_table(b, "env");
1042                 blobmsg_list_for_each(&in->env, var)
1043                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1044                 blobmsg_close_table(b, e);
1045         }
1046
1047         if (!avl_is_empty(&in->data.avl)) {
1048                 struct blobmsg_list_node *var;
1049                 void *e = blobmsg_open_table(b, "data");
1050                 blobmsg_list_for_each(&in->data, var)
1051                         blobmsg_add_blob(b, var->data);
1052                 blobmsg_close_table(b, e);
1053         }
1054
1055         if (!avl_is_empty(&in->limits.avl)) {
1056                 struct blobmsg_list_node *var;
1057                 void *e = blobmsg_open_table(b, "limits");
1058                 blobmsg_list_for_each(&in->limits, var)
1059                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1060                 blobmsg_close_table(b, e);
1061         }
1062
1063         if (in->reload_signal)
1064                 blobmsg_add_u32(b, "reload_signal", in->reload_signal);
1065
1066         if (in->respawn) {
1067                 void *r = blobmsg_open_table(b, "respawn");
1068                 blobmsg_add_u32(b, "threshold", in->respawn_threshold);
1069                 blobmsg_add_u32(b, "timeout", in->respawn_timeout);
1070                 blobmsg_add_u32(b, "retry", in->respawn_retry);
1071                 blobmsg_close_table(b, r);
1072         }
1073
1074         if (in->trace)
1075                 blobmsg_add_u8(b, "trace", true);
1076
1077         if (in->no_new_privs)
1078                 blobmsg_add_u8(b, "no_new_privs", true);
1079
1080         if (in->seccomp)
1081                 blobmsg_add_string(b, "seccomp", in->seccomp);
1082
1083         if (in->pidfile)
1084                 blobmsg_add_string(b, "pidfile", in->pidfile);
1085
1086         if (in->has_jail) {
1087                 void *r = blobmsg_open_table(b, "jail");
1088                 if (in->jail.name)
1089                         blobmsg_add_string(b, "name", in->jail.name);
1090                 if (in->jail.hostname)
1091                         blobmsg_add_string(b, "hostname", in->jail.hostname);
1092                 blobmsg_add_u8(b, "procfs", in->jail.procfs);
1093                 blobmsg_add_u8(b, "sysfs", in->jail.sysfs);
1094                 blobmsg_add_u8(b, "ubus", in->jail.ubus);
1095                 blobmsg_add_u8(b, "log", in->jail.log);
1096                 blobmsg_add_u8(b, "ronly", in->jail.ronly);
1097                 blobmsg_close_table(b, r);
1098                 if (!avl_is_empty(&in->jail.mount.avl)) {
1099                         struct blobmsg_list_node *var;
1100                         void *e = blobmsg_open_table(b, "mount");
1101                         blobmsg_list_for_each(&in->jail.mount, var)
1102                                 blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1103                         blobmsg_close_table(b, e);
1104                 }
1105         }
1106
1107         if (verbose && in->trigger)
1108                 blobmsg_add_blob(b, in->trigger);
1109
1110         blobmsg_close_table(b, i);
1111 }