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 <grp.h>
  21 #include <net/if.h>
  22 #include <unistd.h>
  23 #include <stdint.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #include <pwd.h>
  27 #include <libgen.h>
  28 #include <unistd.h>
  29 #define SYSLOG_NAMES
  30 #include <syslog.h>
  31
  32 #include <libubox/md5.h>
  33
  34 #include "../procd.h"
  35
  36 #include "service.h"
  37 #include "instance.h"
  38
  39 #define UJAIL_BIN_PATH "/sbin/ujail"
  40
  41 enum {
  42         INSTANCE_ATTR_COMMAND,
  43         INSTANCE_ATTR_ENV,
  44         INSTANCE_ATTR_DATA,
  45         INSTANCE_ATTR_NETDEV,
  46         INSTANCE_ATTR_FILE,
  47         INSTANCE_ATTR_TRIGGER,
  48         INSTANCE_ATTR_RESPAWN,
  49         INSTANCE_ATTR_NICE,
  50         INSTANCE_ATTR_LIMITS,
  51         INSTANCE_ATTR_WATCH,
  52         INSTANCE_ATTR_ERROR,
  53         INSTANCE_ATTR_USER,
  54         INSTANCE_ATTR_GROUP,
  55         INSTANCE_ATTR_STDOUT,
  56         INSTANCE_ATTR_STDERR,
  57         INSTANCE_ATTR_NO_NEW_PRIVS,
  58         INSTANCE_ATTR_JAIL,
  59         INSTANCE_ATTR_TRACE,
  60         INSTANCE_ATTR_SECCOMP,
  61         INSTANCE_ATTR_PIDFILE,
  62         INSTANCE_ATTR_RELOADSIG,
  63         INSTANCE_ATTR_TERMTIMEOUT,
  64         INSTANCE_ATTR_FACILITY,
  65         __INSTANCE_ATTR_MAX
  66 };
  67
  68 static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = {
  69         [INSTANCE_ATTR_COMMAND] = { "command", BLOBMSG_TYPE_ARRAY },
  70         [INSTANCE_ATTR_ENV] = { "env", BLOBMSG_TYPE_TABLE },
  71         [INSTANCE_ATTR_DATA] = { "data", BLOBMSG_TYPE_TABLE },
  72         [INSTANCE_ATTR_NETDEV] = { "netdev", BLOBMSG_TYPE_ARRAY },
  73         [INSTANCE_ATTR_FILE] = { "file", BLOBMSG_TYPE_ARRAY },
  74         [INSTANCE_ATTR_TRIGGER] = { "triggers", BLOBMSG_TYPE_ARRAY },
  75         [INSTANCE_ATTR_RESPAWN] = { "respawn", BLOBMSG_TYPE_ARRAY },
  76         [INSTANCE_ATTR_NICE] = { "nice", BLOBMSG_TYPE_INT32 },
  77         [INSTANCE_ATTR_LIMITS] = { "limits", BLOBMSG_TYPE_TABLE },
  78         [INSTANCE_ATTR_WATCH] = { "watch", BLOBMSG_TYPE_ARRAY },
  79         [INSTANCE_ATTR_ERROR] = { "error", BLOBMSG_TYPE_ARRAY },
  80         [INSTANCE_ATTR_USER] = { "user", BLOBMSG_TYPE_STRING },
  81         [INSTANCE_ATTR_GROUP] = { "group", BLOBMSG_TYPE_STRING },
  82         [INSTANCE_ATTR_STDOUT] = { "stdout", BLOBMSG_TYPE_BOOL },
  83         [INSTANCE_ATTR_STDERR] = { "stderr", BLOBMSG_TYPE_BOOL },
  84         [INSTANCE_ATTR_NO_NEW_PRIVS] = { "no_new_privs", BLOBMSG_TYPE_BOOL },
  85         [INSTANCE_ATTR_JAIL] = { "jail", BLOBMSG_TYPE_TABLE },
  86         [INSTANCE_ATTR_TRACE] = { "trace", BLOBMSG_TYPE_BOOL },
  87         [INSTANCE_ATTR_SECCOMP] = { "seccomp", BLOBMSG_TYPE_STRING },
  88         [INSTANCE_ATTR_PIDFILE] = { "pidfile", BLOBMSG_TYPE_STRING },
  89         [INSTANCE_ATTR_RELOADSIG] = { "reload_signal", BLOBMSG_TYPE_INT32 },
  90         [INSTANCE_ATTR_TERMTIMEOUT] = { "term_timeout", BLOBMSG_TYPE_INT32 },
  91         [INSTANCE_ATTR_FACILITY] = { "facility", BLOBMSG_TYPE_STRING },
  92 };
  93
  94 enum {
  95         JAIL_ATTR_NAME,
  96         JAIL_ATTR_HOSTNAME,
  97         JAIL_ATTR_PROCFS,
  98         JAIL_ATTR_SYSFS,
  99         JAIL_ATTR_UBUS,
 100         JAIL_ATTR_LOG,
 101         JAIL_ATTR_RONLY,
 102         JAIL_ATTR_MOUNT,
 103         __JAIL_ATTR_MAX,
 104 };
 105
 106 static const struct blobmsg_policy jail_attr[__JAIL_ATTR_MAX] = {
 107         [JAIL_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 108         [JAIL_ATTR_HOSTNAME] = { "hostname", BLOBMSG_TYPE_STRING },
 109         [JAIL_ATTR_PROCFS] = { "procfs", BLOBMSG_TYPE_BOOL },
 110         [JAIL_ATTR_SYSFS] = { "sysfs", BLOBMSG_TYPE_BOOL },
 111         [JAIL_ATTR_UBUS] = { "ubus", BLOBMSG_TYPE_BOOL },
 112         [JAIL_ATTR_LOG] = { "log", BLOBMSG_TYPE_BOOL },
 113         [JAIL_ATTR_RONLY] = { "ronly", BLOBMSG_TYPE_BOOL },
 114         [JAIL_ATTR_MOUNT] = { "mount", BLOBMSG_TYPE_TABLE },
 115 };
 116
 117 struct instance_netdev {
 118         struct blobmsg_list_node node;
 119         int ifindex;
 120 };
 121
 122 struct instance_file {
 123         struct blobmsg_list_node node;
 124         uint32_t md5[4];
 125 };
 126
 127 struct rlimit_name {
 128         const char *name;
 129         int resource;
 130 };
 131
 132 static const struct rlimit_name rlimit_names[] = {
 133         { "as", RLIMIT_AS },
 134         { "core", RLIMIT_CORE },
 135         { "cpu", RLIMIT_CPU },
 136         { "data", RLIMIT_DATA },
 137         { "fsize", RLIMIT_FSIZE },
 138         { "memlock", RLIMIT_MEMLOCK },
 139         { "nofile", RLIMIT_NOFILE },
 140         { "nproc", RLIMIT_NPROC },
 141         { "rss", RLIMIT_RSS },
 142         { "stack", RLIMIT_STACK },
 143 #ifdef linux
 144         { "nice", RLIMIT_NICE },
 145         { "rtprio", RLIMIT_RTPRIO },
 146         { "msgqueue", RLIMIT_MSGQUEUE },
 147         { "sigpending", RLIMIT_SIGPENDING },
 148 #endif
 149         { NULL, 0 }
 150 };
 151
 152 static void closefd(int fd)
 153 {
 154         if (fd > STDERR_FILENO)
 155                 close(fd);
 156 }
 157
 158 /* convert a string into numeric syslog facility or return -1 if no match found */
 159 static int
 160 syslog_facility_str_to_int(const char *facility)
 161 {
 162         CODE *p = facilitynames;
 163
 164         while (p->c_name && strcasecmp(p->c_name, facility))
 165                 p++;
 166
 167         return p->c_val;
 168 }
 169
 170 static void
 171 instance_limits(const char *limit, const char *value)
 172 {
 173         int i;
 174         struct rlimit rlim;
 175         unsigned long cur, max;
 176
 177         for (i = 0; rlimit_names[i].name != NULL; i++) {
 178                 if (strcmp(rlimit_names[i].name, limit))
 179                         continue;
 180                 if (!strcmp(value, "unlimited")) {
 181                         rlim.rlim_cur = RLIM_INFINITY;
 182                         rlim.rlim_max = RLIM_INFINITY;
 183                 } else {
 184                         if (getrlimit(rlimit_names[i].resource, &rlim))
 185                                 return;
 186
 187                         cur = rlim.rlim_cur;
 188                         max = rlim.rlim_max;
 189
 190                         if (sscanf(value, "%lu %lu", &cur, &max) < 1)
 191                                 return;
 192
 193                         rlim.rlim_cur = cur;
 194                         rlim.rlim_max = max;
 195                 }
 196
 197                 setrlimit(rlimit_names[i].resource, &rlim);
 198                 return;
 199         }
 200 }
 201
 202 static inline int
 203 jail_run(struct service_instance *in, char **argv)
 204 {
 205         struct blobmsg_list_node *var;
 206         struct jail *jail = &in->jail;
 207         int argc = 0;
 208
 209         argv[argc++] = UJAIL_BIN_PATH;
 210
 211         if (jail->name) {
 212                 argv[argc++] = "-n";
 213                 argv[argc++] = jail->name;
 214         }
 215
 216         if (jail->hostname) {
 217                 argv[argc++] = "-h";
 218                 argv[argc++] = jail->hostname;
 219         }
 220
 221         if (in->seccomp) {
 222                 argv[argc++] = "-S";
 223                 argv[argc++] = in->seccomp;
 224         }
 225
 226         if (in->user) {
 227                 argv[argc++] = "-U";
 228                 argv[argc++] = in->user;
 229         }
 230
 231         if (in->group) {
 232                 argv[argc++] = "-G";
 233                 argv[argc++] = in->group;
 234         }
 235
 236         if (in->no_new_privs)
 237                 argv[argc++] = "-c";
 238
 239         if (jail->procfs)
 240                 argv[argc++] = "-p";
 241
 242         if (jail->sysfs)
 243                 argv[argc++] = "-s";
 244
 245         if (jail->ubus)
 246                 argv[argc++] = "-u";
 247
 248         if (jail->log)
 249                 argv[argc++] = "-l";
 250
 251         if (jail->ronly)
 252                 argv[argc++] = "-o";
 253
 254         blobmsg_list_for_each(&jail->mount, var) {
 255                 const char *type = blobmsg_data(var->data);
 256
 257                 if (*type == '1')
 258                         argv[argc++] = "-w";
 259                 else
 260                         argv[argc++] = "-r";
 261                 argv[argc++] = (char *) blobmsg_name(var->data);
 262         }
 263
 264         argv[argc++] = "--";
 265
 266         return argc;
 267 }
 268
 269 static int
 270 instance_removepid(struct service_instance *in) {
 271         if (!in->pidfile)
 272                 return 0;
 273         if (unlink(in->pidfile)) {
 274                 ERROR("Failed to remove pidfile: %s: %m\n", in->pidfile);
 275                 return 1;
 276         }
 277         return 0;
 278 }
 279
 280 static int
 281 instance_writepid(struct service_instance *in)
 282 {
 283         FILE *_pidfile;
 284
 285         if (!in->pidfile) {
 286                 return 0;
 287         }
 288         _pidfile = fopen(in->pidfile, "w");
 289         if (_pidfile == NULL) {
 290                 ERROR("failed to open pidfile for writing: %s: %m", in->pidfile);
 291                 return 1;
 292         }
 293         if (fprintf(_pidfile, "%d\n", in->proc.pid) < 0) {
 294                 ERROR("failed to write pidfile: %s: %m", in->pidfile);
 295                 fclose(_pidfile);
 296                 return 2;
 297         }
 298         if (fclose(_pidfile)) {
 299                 ERROR("failed to close pidfile: %s: %m", in->pidfile);
 300                 return 3;
 301         }
 302
 303         return 0;
 304 }
 305
 306 static void
 307 instance_run(struct service_instance *in, int _stdout, int _stderr)
 308 {
 309         struct blobmsg_list_node *var;
 310         struct blob_attr *cur;
 311         char **argv;
 312         int argc = 1; /* NULL terminated */
 313         int rem, _stdin;
 314         bool seccomp = !in->trace && !in->has_jail && in->seccomp;
 315         bool setlbf = _stdout >= 0;
 316
 317         if (in->nice)
 318                 setpriority(PRIO_PROCESS, 0, in->nice);
 319
 320         blobmsg_for_each_attr(cur, in->command, rem)
 321                 argc++;
 322
 323         blobmsg_list_for_each(&in->env, var)
 324                 setenv(blobmsg_name(var->data), blobmsg_data(var->data), 1);
 325
 326         if (seccomp)
 327                 setenv("SECCOMP_FILE", in->seccomp, 1);
 328
 329         if (setlbf)
 330                 setenv("LD_PRELOAD", "/lib/libsetlbf.so", 1);
 331
 332         blobmsg_list_for_each(&in->limits, var)
 333                 instance_limits(blobmsg_name(var->data), blobmsg_data(var->data));
 334
 335         if (in->trace || seccomp)
 336                 argc += 1;
 337
 338         argv = alloca(sizeof(char *) * (argc + in->jail.argc));
 339         argc = 0;
 340
 341 #ifdef SECCOMP_SUPPORT
 342         if (in->trace)
 343                 argv[argc++] = "/sbin/utrace";
 344         else if (seccomp)
 345                 argv[argc++] = "/sbin/seccomp-trace";
 346 #else
 347         if (in->trace || seccomp)
 348                 ULOG_WARN("Seccomp support for %s::%s not available\n", in->srv->name, in->name);
 349 #endif
 350
 351         if (in->has_jail) {
 352                 argc = jail_run(in, argv);
 353                 if (argc != in->jail.argc)
 354                         ULOG_WARN("expected %i jail params, used %i for %s::%s\n",
 355                                 in->jail.argc, argc, in->srv->name, in->name);
 356         }
 357
 358         blobmsg_for_each_attr(cur, in->command, rem)
 359                 argv[argc++] = blobmsg_data(cur);
 360
 361         argv[argc] = NULL;
 362
 363         _stdin = open("/dev/null", O_RDONLY);
 364
 365         if (_stdout == -1)
 366                 _stdout = open("/dev/null", O_WRONLY);
 367
 368         if (_stderr == -1)
 369                 _stderr = open("/dev/null", O_WRONLY);
 370
 371         if (_stdin > -1) {
 372                 dup2(_stdin, STDIN_FILENO);
 373                 closefd(_stdin);
 374         }
 375         if (_stdout > -1) {
 376                 dup2(_stdout, STDOUT_FILENO);
 377                 closefd(_stdout);
 378         }
 379         if (_stderr > -1) {
 380                 dup2(_stderr, STDERR_FILENO);
 381                 closefd(_stderr);
 382         }
 383
 384         if (!in->has_jail && in->user && in->pw_gid && initgroups(in->user, in->pw_gid)) {
 385                 ERROR("failed to initgroups() for user %s: %m\n", in->user);
 386                 exit(127);
 387         }
 388         if (!in->has_jail && in->gr_gid && setgid(in->gr_gid)) {
 389                 ERROR("failed to set group id %d: %m\n", in->gr_gid);
 390                 exit(127);
 391         }
 392         if (!in->has_jail && in->uid && setuid(in->uid)) {
 393                 ERROR("failed to set user id %d: %m\n", in->uid);
 394                 exit(127);
 395         }
 396
 397         execvp(argv[0], argv);
 398         exit(127);
 399 }
 400
 401 static void
 402 instance_free_stdio(struct service_instance *in)
 403 {
 404         if (in->_stdout.fd.fd > -1) {
 405                 ustream_free(&in->_stdout.stream);
 406                 close(in->_stdout.fd.fd);
 407                 in->_stdout.fd.fd = -1;
 408         }
 409
 410         if (in->_stderr.fd.fd > -1) {
 411                 ustream_free(&in->_stderr.stream);
 412                 close(in->_stderr.fd.fd);
 413                 in->_stderr.fd.fd = -1;
 414         }
 415 }
 416
 417 void
 418 instance_start(struct service_instance *in)
 419 {
 420         int pid;
 421         int opipe[2] = { -1, -1 };
 422         int epipe[2] = { -1, -1 };
 423
 424         if (!avl_is_empty(&in->errors.avl)) {
 425                 LOG("Not starting instance %s::%s, an error was indicated\n", in->srv->name, in->name);
 426                 return;
 427         }
 428
 429         if (!in->command) {
 430                 LOG("Not starting instance %s::%s, command not set\n", in->srv->name, in->name);
 431                 return;
 432         }
 433
 434         if (in->proc.pending) {
 435                 if (in->halt)
 436                         in->restart = true;
 437                 return;
 438         }
 439
 440         instance_free_stdio(in);
 441         if (in->_stdout.fd.fd > -2) {
 442                 if (pipe(opipe)) {
 443                         ULOG_WARN("pipe() failed: %m\n");
 444                         opipe[0] = opipe[1] = -1;
 445                 }
 446         }
 447
 448         if (in->_stderr.fd.fd > -2) {
 449                 if (pipe(epipe)) {
 450                         ULOG_WARN("pipe() failed: %m\n");
 451                         epipe[0] = epipe[1] = -1;
 452                 }
 453         }
 454
 455         in->restart = false;
 456         in->halt = false;
 457
 458         if (!in->valid)
 459                 return;
 460
 461         pid = fork();
 462         if (pid < 0)
 463                 return;
 464
 465         if (!pid) {
 466                 uloop_done();
 467                 closefd(opipe[0]);
 468                 closefd(epipe[0]);
 469                 instance_run(in, opipe[1], epipe[1]);
 470                 return;
 471         }
 472
 473         DEBUG(2, "Started instance %s::%s[%d]\n", in->srv->name, in->name, pid);
 474         in->proc.pid = pid;
 475         instance_writepid(in);
 476         clock_gettime(CLOCK_MONOTONIC, &in->start);
 477         uloop_process_add(&in->proc);
 478
 479         if (opipe[0] > -1) {
 480                 ustream_fd_init(&in->_stdout, opipe[0]);
 481                 closefd(opipe[1]);
 482                 fcntl(opipe[0], F_SETFD, FD_CLOEXEC);
 483         }
 484
 485         if (epipe[0] > -1) {
 486                 ustream_fd_init(&in->_stderr, epipe[0]);
 487                 closefd(epipe[1]);
 488                 fcntl(epipe[0], F_SETFD, FD_CLOEXEC);
 489         }
 490
 491         service_event("instance.start", in->srv->name, in->name);
 492 }
 493
 494 static void
 495 instance_stdio(struct ustream *s, int prio, struct service_instance *in)
 496 {
 497         char *newline, *str, *arg0, ident[32];
 498         int len;
 499
 500         arg0 = basename(blobmsg_data(blobmsg_data(in->command)));
 501         snprintf(ident, sizeof(ident), "%s[%d]", arg0, in->proc.pid);
 502         ulog_open(ULOG_SYSLOG, in->syslog_facility, ident);
 503
 504         do {
 505                 str = ustream_get_read_buf(s, &len);
 506                 if (!str)
 507                         break;
 508
 509                 newline = memchr(str, '\n', len);
 510                 if (!newline && (s->r.buffer_len != len))
 511                         break;
 512
 513                 if (newline) {
 514                         *newline = 0;
 515                         len = newline + 1 - str;
 516                 }
 517                 ulog(prio, "%s\n", str);
 518
 519                 ustream_consume(s, len);
 520         } while (1);
 521
 522         ulog_open(ULOG_SYSLOG, LOG_DAEMON, "procd");
 523 }
 524
 525 static void
 526 instance_stdout(struct ustream *s, int bytes)
 527 {
 528         instance_stdio(s, LOG_INFO,
 529                        container_of(s, struct service_instance, _stdout.stream));
 530 }
 531
 532 static void
 533 instance_stderr(struct ustream *s, int bytes)
 534 {
 535         instance_stdio(s, LOG_ERR,
 536                        container_of(s, struct service_instance, _stderr.stream));
 537 }
 538
 539 static void
 540 instance_timeout(struct uloop_timeout *t)
 541 {
 542         struct service_instance *in;
 543
 544         in = container_of(t, struct service_instance, timeout);
 545
 546         if (in->halt) {
 547                 LOG("Instance %s::%s pid %d not stopped on SIGTERM, sending SIGKILL instead\n",
 548                                 in->srv->name, in->name, in->proc.pid);
 549                 kill(in->proc.pid, SIGKILL);
 550         } else if (in->restart || in->respawn)
 551                 instance_start(in);
 552 }
 553
 554 static void
 555 instance_delete(struct service_instance *in)
 556 {
 557         struct service *s = in->srv;
 558
 559         avl_delete(&s->instances.avl, &in->node.avl);
 560         instance_free(in);
 561         service_stopped(s);
 562 }
 563
 564 static void
 565 instance_exit(struct uloop_process *p, int ret)
 566 {
 567         struct service_instance *in;
 568         struct timespec tp;
 569         long runtime;
 570
 571         in = container_of(p, struct service_instance, proc);
 572
 573         clock_gettime(CLOCK_MONOTONIC, &tp);
 574         runtime = tp.tv_sec - in->start.tv_sec;
 575
 576         DEBUG(2, "Instance %s::%s exit with error code %d after %ld seconds\n", in->srv->name, in->name, ret, runtime);
 577
 578         uloop_timeout_cancel(&in->timeout);
 579         service_event("instance.stop", in->srv->name, in->name);
 580
 581         if (in->halt) {
 582                 instance_removepid(in);
 583                 if (in->restart)
 584                         instance_start(in);
 585                 else
 586                         instance_delete(in);
 587         } else if (in->restart) {
 588                 instance_start(in);
 589         } else if (in->respawn) {
 590                 if (runtime < in->respawn_threshold)
 591                         in->respawn_count++;
 592                 else
 593                         in->respawn_count = 0;
 594                 if (in->respawn_count > in->respawn_retry && in->respawn_retry > 0 ) {
 595                         LOG("Instance %s::%s s in a crash loop %d crashes, %ld seconds since last crash\n",
 596                                                                 in->srv->name, in->name, in->respawn_count, runtime);
 597                         in->restart = in->respawn = 0;
 598                         in->halt = 1;
 599                         service_event("instance.fail", in->srv->name, in->name);
 600                 } else {
 601                         service_event("instance.respawn", in->srv->name, in->name);
 602                         uloop_timeout_set(&in->timeout, in->respawn_timeout * 1000);
 603                 }
 604         }
 605 }
 606
 607 void
 608 instance_stop(struct service_instance *in, bool halt)
 609 {
 610         if (!in->proc.pending) {
 611                 if (halt)
 612                         instance_delete(in);
 613                 return;
 614         }
 615         in->halt = halt;
 616         in->restart = in->respawn = false;
 617         kill(in->proc.pid, SIGTERM);
 618         uloop_timeout_set(&in->timeout, in->term_timeout * 1000);
 619 }
 620
 621 static void
 622 instance_restart(struct service_instance *in)
 623 {
 624         if (!in->proc.pending)
 625                 return;
 626
 627         if (in->reload_signal) {
 628                 kill(in->proc.pid, in->reload_signal);
 629                 return;
 630         }
 631
 632         in->halt = true;
 633         in->restart = true;
 634         kill(in->proc.pid, SIGTERM);
 635         uloop_timeout_set(&in->timeout, in->term_timeout * 1000);
 636 }
 637
 638 static bool string_changed(const char *a, const char *b)
 639 {
 640         return !((!a && !b) || (a && b && !strcmp(a, b)));
 641 }
 642
 643 static bool
 644 instance_config_changed(struct service_instance *in, struct service_instance *in_new)
 645 {
 646         if (!in->valid)
 647                 return true;
 648
 649         if (!blob_attr_equal(in->command, in_new->command))
 650                 return true;
 651
 652         if (!blobmsg_list_equal(&in->env, &in_new->env))
 653                 return true;
 654
 655         if (!blobmsg_list_equal(&in->netdev, &in_new->netdev))
 656                 return true;
 657
 658         if (!blobmsg_list_equal(&in->file, &in_new->file))
 659                 return true;
 660
 661         if (in->nice != in_new->nice)
 662                 return true;
 663
 664         if (in->syslog_facility != in_new->syslog_facility)
 665                 return true;
 666
 667         if (string_changed(in->user, in_new->user))
 668                 return true;
 669
 670         if (string_changed(in->group, in_new->group))
 671                 return true;
 672
 673         if (in->uid != in_new->uid)
 674                 return true;
 675
 676         if (in->pw_gid != in_new->pw_gid)
 677                 return true;
 678
 679         if (string_changed(in->pidfile, in_new->pidfile))
 680                 return true;
 681
 682         if (in->respawn_retry != in_new->respawn_retry)
 683                 return true;
 684         if (in->respawn_threshold != in_new->respawn_threshold)
 685                 return true;
 686         if (in->respawn_timeout != in_new->respawn_timeout)
 687                 return true;
 688
 689         if ((!in->seccomp && in_new->seccomp) ||
 690             (in->seccomp && !in_new->seccomp) ||
 691             (in->seccomp && in_new->seccomp && strcmp(in->seccomp, in_new->seccomp)))
 692                 return true;
 693
 694         if (!blobmsg_list_equal(&in->limits, &in_new->limits))
 695                 return true;
 696
 697         if (!blobmsg_list_equal(&in->jail.mount, &in_new->jail.mount))
 698                 return true;
 699
 700         if (!blobmsg_list_equal(&in->errors, &in_new->errors))
 701                 return true;
 702
 703         return false;
 704 }
 705
 706 static bool
 707 instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 708 {
 709         struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
 710         struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
 711
 712         return n1->ifindex == n2->ifindex;
 713 }
 714
 715 static void
 716 instance_netdev_update(struct blobmsg_list_node *l)
 717 {
 718         struct instance_netdev *n = container_of(l, struct instance_netdev, node);
 719
 720         n->ifindex = if_nametoindex(n->node.avl.key);
 721 }
 722
 723 static bool
 724 instance_file_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 725 {
 726         struct instance_file *f1 = container_of(l1, struct instance_file, node);
 727         struct instance_file *f2 = container_of(l2, struct instance_file, node);
 728
 729         return !memcmp(f1->md5, f2->md5, sizeof(f1->md5));
 730 }
 731
 732 static void
 733 instance_file_update(struct blobmsg_list_node *l)
 734 {
 735         struct instance_file *f = container_of(l, struct instance_file, node);
 736         md5_ctx_t md5;
 737         char buf[256];
 738         int len, fd;
 739
 740         memset(f->md5, 0, sizeof(f->md5));
 741
 742         fd = open(l->avl.key, O_RDONLY);
 743         if (fd < 0)
 744                 return;
 745
 746         md5_begin(&md5);
 747         do {
 748                 len = read(fd, buf, sizeof(buf));
 749                 if (len < 0) {
 750                         if (errno == EINTR)
 751                                 continue;
 752
 753                         break;
 754                 }
 755                 if (!len)
 756                         break;
 757
 758                 md5_hash(buf, len, &md5);
 759         } while(1);
 760
 761         md5_end(f->md5, &md5);
 762         close(fd);
 763 }
 764
 765 static void
 766 instance_fill_any(struct blobmsg_list *l, struct blob_attr *cur)
 767 {
 768         if (!cur)
 769                 return;
 770
 771         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), false);
 772 }
 773
 774 static bool
 775 instance_fill_array(struct blobmsg_list *l, struct blob_attr *cur, blobmsg_update_cb cb, bool array)
 776 {
 777         struct blobmsg_list_node *node;
 778
 779         if (!cur)
 780                 return true;
 781
 782         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 783                 return false;
 784
 785         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), array);
 786         if (cb) {
 787                 blobmsg_list_for_each(l, node)
 788                         cb(node);
 789         }
 790         return true;
 791 }
 792
 793 static int
 794 instance_jail_parse(struct service_instance *in, struct blob_attr *attr)
 795 {
 796         struct blob_attr *tb[__JAIL_ATTR_MAX];
 797         struct jail *jail = &in->jail;
 798         struct stat s;
 799         int r;
 800
 801         r = stat(UJAIL_BIN_PATH, &s);
 802         if (r < 0) {
 803                 ERROR("unable to find %s: %m (%d)\n", UJAIL_BIN_PATH, r);
 804                 return 0;
 805         }
 806
 807         blobmsg_parse(jail_attr, __JAIL_ATTR_MAX, tb,
 808                 blobmsg_data(attr), blobmsg_data_len(attr));
 809
 810         jail->argc = 2;
 811
 812         if (tb[JAIL_ATTR_NAME]) {
 813                 jail->name = strdup(blobmsg_get_string(tb[JAIL_ATTR_NAME]));
 814                 jail->argc += 2;
 815         }
 816         if (tb[JAIL_ATTR_HOSTNAME]) {
 817                 jail->hostname = strdup(blobmsg_get_string(tb[JAIL_ATTR_HOSTNAME]));
 818                 jail->argc += 2;
 819         }
 820         if (tb[JAIL_ATTR_PROCFS]) {
 821                 jail->procfs = blobmsg_get_bool(tb[JAIL_ATTR_PROCFS]);
 822                 jail->argc++;
 823         }
 824         if (tb[JAIL_ATTR_SYSFS]) {
 825                 jail->sysfs = blobmsg_get_bool(tb[JAIL_ATTR_SYSFS]);
 826                 jail->argc++;
 827         }
 828         if (tb[JAIL_ATTR_UBUS]) {
 829                 jail->ubus = blobmsg_get_bool(tb[JAIL_ATTR_UBUS]);
 830                 jail->argc++;
 831         }
 832         if (tb[JAIL_ATTR_LOG]) {
 833                 jail->log = blobmsg_get_bool(tb[JAIL_ATTR_LOG]);
 834                 jail->argc++;
 835         }
 836         if (tb[JAIL_ATTR_RONLY]) {
 837                 jail->ronly = blobmsg_get_bool(tb[JAIL_ATTR_RONLY]);
 838                 jail->argc++;
 839         }
 840         if (tb[JAIL_ATTR_MOUNT]) {
 841                 struct blob_attr *cur;
 842                 int rem;
 843
 844                 blobmsg_for_each_attr(cur, tb[JAIL_ATTR_MOUNT], rem)
 845                         jail->argc += 2;
 846                 instance_fill_array(&jail->mount, tb[JAIL_ATTR_MOUNT], NULL, false);
 847         }
 848         if (in->seccomp)
 849                 jail->argc += 2;
 850
 851         if (in->user)
 852                 jail->argc += 2;
 853
 854         if (in->group)
 855                 jail->argc += 2;
 856
 857         if (in->no_new_privs)
 858                 jail->argc++;
 859
 860         return 1;
 861 }
 862
 863 static bool
 864 instance_config_parse_command(struct service_instance *in, struct blob_attr **tb)
 865 {
 866         struct blob_attr *cur, *cur2;
 867         bool ret = false;
 868         int rem;
 869
 870         cur = tb[INSTANCE_ATTR_COMMAND];
 871         if (!cur) {
 872                 in->command = NULL;
 873                 return true;
 874         }
 875
 876         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 877                 return false;
 878
 879         blobmsg_for_each_attr(cur2, cur, rem) {
 880                 ret = true;
 881                 break;
 882         }
 883
 884         in->command = cur;
 885         return ret;
 886 }
 887
 888 static bool
 889 instance_config_parse(struct service_instance *in)
 890 {
 891         struct blob_attr *tb[__INSTANCE_ATTR_MAX];
 892         struct blob_attr *cur, *cur2;
 893         int rem;
 894
 895         blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
 896                 blobmsg_data(in->config), blobmsg_data_len(in->config));
 897
 898         if (!instance_config_parse_command(in, tb))
 899                 return false;
 900
 901         if (tb[INSTANCE_ATTR_TERMTIMEOUT])
 902                 in->term_timeout = blobmsg_get_u32(tb[INSTANCE_ATTR_TERMTIMEOUT]);
 903         if (tb[INSTANCE_ATTR_RESPAWN]) {
 904                 int i = 0;
 905                 uint32_t vals[3] = { 3600, 5, 5};
 906
 907                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_RESPAWN], rem) {
 908                         if ((i >= 3) && (blobmsg_type(cur2) == BLOBMSG_TYPE_STRING))
 909                                 continue;
 910                         vals[i] = atoi(blobmsg_get_string(cur2));
 911                         i++;
 912                 }
 913                 in->respawn = true;
 914                 in->respawn_count = 0;
 915                 in->respawn_threshold = vals[0];
 916                 in->respawn_timeout = vals[1];
 917                 in->respawn_retry = vals[2];
 918         }
 919         if (tb[INSTANCE_ATTR_TRIGGER]) {
 920                 in->trigger = tb[INSTANCE_ATTR_TRIGGER];
 921                 trigger_add(in->trigger, in);
 922         }
 923
 924         if (tb[INSTANCE_ATTR_WATCH]) {
 925                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_WATCH], rem) {
 926                         if (blobmsg_type(cur2) != BLOBMSG_TYPE_STRING)
 927                                 continue;
 928                         DEBUG(3, "watch for %s\n", blobmsg_get_string(cur2));
 929                         watch_add(blobmsg_get_string(cur2), in);
 930                 }
 931         }
 932
 933         if ((cur = tb[INSTANCE_ATTR_NICE])) {
 934                 in->nice = (int8_t) blobmsg_get_u32(cur);
 935                 if (in->nice < -20 || in->nice > 20)
 936                         return false;
 937         }
 938
 939         if (tb[INSTANCE_ATTR_USER]) {
 940                 const char *user = blobmsg_get_string(tb[INSTANCE_ATTR_USER]);
 941                 struct passwd *p = getpwnam(user);
 942                 if (p) {
 943                         in->user = strdup(user);
 944                         in->uid = p->pw_uid;
 945                         in->gr_gid = in->pw_gid = p->pw_gid;
 946                 }
 947         }
 948
 949         if (tb[INSTANCE_ATTR_GROUP]) {
 950                 const char *group = blobmsg_get_string(tb[INSTANCE_ATTR_GROUP]);
 951                 struct group *p = getgrnam(group);
 952                 if (p) {
 953                         in->group = strdup(group);
 954                         in->gr_gid = p->gr_gid;
 955                 }
 956         }
 957
 958         if (tb[INSTANCE_ATTR_TRACE])
 959                 in->trace = blobmsg_get_bool(tb[INSTANCE_ATTR_TRACE]);
 960
 961         if (tb[INSTANCE_ATTR_NO_NEW_PRIVS])
 962                 in->no_new_privs = blobmsg_get_bool(tb[INSTANCE_ATTR_NO_NEW_PRIVS]);
 963
 964         if (!in->trace && tb[INSTANCE_ATTR_SECCOMP])
 965                 in->seccomp = strdup(blobmsg_get_string(tb[INSTANCE_ATTR_SECCOMP]));
 966
 967         if (tb[INSTANCE_ATTR_PIDFILE]) {
 968                 char *pidfile = blobmsg_get_string(tb[INSTANCE_ATTR_PIDFILE]);
 969                 if (pidfile)
 970                         in->pidfile = strdup(pidfile);
 971         }
 972
 973         if (tb[INSTANCE_ATTR_RELOADSIG])
 974                 in->reload_signal = blobmsg_get_u32(tb[INSTANCE_ATTR_RELOADSIG]);
 975
 976         if (!in->trace && tb[INSTANCE_ATTR_JAIL])
 977                 in->has_jail = instance_jail_parse(in, tb[INSTANCE_ATTR_JAIL]);
 978
 979         if (tb[INSTANCE_ATTR_STDOUT] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDOUT]))
 980                 in->_stdout.fd.fd = -1;
 981
 982         if (tb[INSTANCE_ATTR_STDERR] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDERR]))
 983                 in->_stderr.fd.fd = -1;
 984
 985         instance_fill_any(&in->data, tb[INSTANCE_ATTR_DATA]);
 986
 987         if (!instance_fill_array(&in->env, tb[INSTANCE_ATTR_ENV], NULL, false))
 988                 return false;
 989
 990         if (!instance_fill_array(&in->netdev, tb[INSTANCE_ATTR_NETDEV], instance_netdev_update, true))
 991                 return false;
 992
 993         if (!instance_fill_array(&in->file, tb[INSTANCE_ATTR_FILE], instance_file_update, true))
 994                 return false;
 995
 996         if (!instance_fill_array(&in->limits, tb[INSTANCE_ATTR_LIMITS], NULL, false))
 997                 return false;
 998
 999         if (!instance_fill_array(&in->errors, tb[INSTANCE_ATTR_ERROR], NULL, true))
1000                 return false;
1001
1002         if (tb[INSTANCE_ATTR_FACILITY]) {
1003                 int facility = syslog_facility_str_to_int(blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
1004                 if (facility != -1) {
1005                         in->syslog_facility = facility;
1006                         DEBUG(3, "setting facility '%s'\n", blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
1007                 } else
1008                         DEBUG(3, "unknown syslog facility '%s' given, using default (LOG_DAEMON)\n", blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
1009         }
1010
1011         return true;
1012 }
1013
1014 static void
1015 instance_config_cleanup(struct service_instance *in)
1016 {
1017         blobmsg_list_free(&in->env);
1018         blobmsg_list_free(&in->data);
1019         blobmsg_list_free(&in->netdev);
1020         blobmsg_list_free(&in->file);
1021         blobmsg_list_free(&in->limits);
1022         blobmsg_list_free(&in->errors);
1023         blobmsg_list_free(&in->jail.mount);
1024 }
1025
1026 static void
1027 instance_config_move_strdup(char **dst, char *src)
1028 {
1029         if (*dst) {
1030                 free(*dst);
1031                 *dst = NULL;
1032         }
1033
1034         if (!src)
1035                 return;
1036
1037         *dst = strdup(src);
1038 }
1039
1040 static void
1041 instance_config_move(struct service_instance *in, struct service_instance *in_src)
1042 {
1043         instance_config_cleanup(in);
1044         blobmsg_list_move(&in->env, &in_src->env);
1045         blobmsg_list_move(&in->data, &in_src->data);
1046         blobmsg_list_move(&in->netdev, &in_src->netdev);
1047         blobmsg_list_move(&in->file, &in_src->file);
1048         blobmsg_list_move(&in->limits, &in_src->limits);
1049         blobmsg_list_move(&in->errors, &in_src->errors);
1050         blobmsg_list_move(&in->jail.mount, &in_src->jail.mount);
1051         in->trigger = in_src->trigger;
1052         in->command = in_src->command;
1053         in->respawn = in_src->respawn;
1054         in->respawn_retry = in_src->respawn_retry;
1055         in->respawn_threshold = in_src->respawn_threshold;
1056         in->respawn_timeout = in_src->respawn_timeout;
1057         in->name = in_src->name;
1058         in->trace = in_src->trace;
1059         in->node.avl.key = in_src->node.avl.key;
1060         in->syslog_facility = in_src->syslog_facility;
1061
1062         instance_config_move_strdup(&in->pidfile, in_src->pidfile);
1063         instance_config_move_strdup(&in->seccomp, in_src->seccomp);
1064         instance_config_move_strdup(&in->jail.name, in_src->jail.name);
1065         instance_config_move_strdup(&in->jail.hostname, in_src->jail.hostname);
1066
1067         free(in->config);
1068         in->config = in_src->config;
1069         in_src->config = NULL;
1070 }
1071
1072 void
1073 instance_update(struct service_instance *in, struct service_instance *in_new)
1074 {
1075         bool changed = instance_config_changed(in, in_new);
1076         bool running = in->proc.pending;
1077         bool stopping = in->halt;
1078
1079         if (!running || stopping) {
1080                 instance_config_move(in, in_new);
1081                 instance_start(in);
1082         } else {
1083                 if (changed)
1084                         instance_restart(in);
1085                 instance_config_move(in, in_new);
1086                 /* restart happens in the child callback handler */
1087         }
1088 }
1089
1090 void
1091 instance_free(struct service_instance *in)
1092 {
1093         instance_free_stdio(in);
1094         uloop_process_delete(&in->proc);
1095         uloop_timeout_cancel(&in->timeout);
1096         trigger_del(in);
1097         watch_del(in);
1098         instance_config_cleanup(in);
1099         free(in->config);
1100         free(in->user);
1101         free(in->group);
1102         free(in->jail.name);
1103         free(in->jail.hostname);
1104         free(in->seccomp);
1105         free(in->pidfile);
1106         free(in);
1107 }
1108
1109 void
1110 instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
1111 {
1112         config = blob_memdup(config);
1113         in->srv = s;
1114         in->name = blobmsg_name(config);
1115         in->config = config;
1116         in->timeout.cb = instance_timeout;
1117         in->proc.cb = instance_exit;
1118         in->term_timeout = 5;
1119         in->syslog_facility = LOG_DAEMON;
1120
1121         in->_stdout.fd.fd = -2;
1122         in->_stdout.stream.string_data = true;
1123         in->_stdout.stream.notify_read = instance_stdout;
1124
1125         in->_stderr.fd.fd = -2;
1126         in->_stderr.stream.string_data = true;
1127         in->_stderr.stream.notify_read = instance_stderr;
1128
1129         blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
1130         blobmsg_list_init(&in->file, struct instance_file, node, instance_file_cmp);
1131         blobmsg_list_simple_init(&in->env);
1132         blobmsg_list_simple_init(&in->data);
1133         blobmsg_list_simple_init(&in->limits);
1134         blobmsg_list_simple_init(&in->errors);
1135         blobmsg_list_simple_init(&in->jail.mount);
1136         in->valid = instance_config_parse(in);
1137 }
1138
1139 void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
1140 {
1141         void *i;
1142
1143         if (!in->valid)
1144                 return;
1145
1146         i = blobmsg_open_table(b, in->name);
1147         blobmsg_add_u8(b, "running", in->proc.pending);
1148         if (in->proc.pending)
1149                 blobmsg_add_u32(b, "pid", in->proc.pid);
1150         if (in->command)
1151                 blobmsg_add_blob(b, in->command);
1152         blobmsg_add_u32(b, "term_timeout", in->term_timeout);
1153
1154         if (!avl_is_empty(&in->errors.avl)) {
1155                 struct blobmsg_list_node *var;
1156                 void *e = blobmsg_open_array(b, "errors");
1157                 blobmsg_list_for_each(&in->errors, var)
1158                         blobmsg_add_string(b, NULL, blobmsg_data(var->data));
1159                 blobmsg_close_table(b, e);
1160         }
1161
1162         if (!avl_is_empty(&in->env.avl)) {
1163                 struct blobmsg_list_node *var;
1164                 void *e = blobmsg_open_table(b, "env");
1165                 blobmsg_list_for_each(&in->env, var)
1166                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1167                 blobmsg_close_table(b, e);
1168         }
1169
1170         if (!avl_is_empty(&in->data.avl)) {
1171                 struct blobmsg_list_node *var;
1172                 void *e = blobmsg_open_table(b, "data");
1173                 blobmsg_list_for_each(&in->data, var)
1174                         blobmsg_add_blob(b, var->data);
1175                 blobmsg_close_table(b, e);
1176         }
1177
1178         if (!avl_is_empty(&in->limits.avl)) {
1179                 struct blobmsg_list_node *var;
1180                 void *e = blobmsg_open_table(b, "limits");
1181                 blobmsg_list_for_each(&in->limits, var)
1182                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1183                 blobmsg_close_table(b, e);
1184         }
1185
1186         if (in->reload_signal)
1187                 blobmsg_add_u32(b, "reload_signal", in->reload_signal);
1188
1189         if (in->respawn) {
1190                 void *r = blobmsg_open_table(b, "respawn");
1191                 blobmsg_add_u32(b, "threshold", in->respawn_threshold);
1192                 blobmsg_add_u32(b, "timeout", in->respawn_timeout);
1193                 blobmsg_add_u32(b, "retry", in->respawn_retry);
1194                 blobmsg_close_table(b, r);
1195         }
1196
1197         if (in->trace)
1198                 blobmsg_add_u8(b, "trace", true);
1199
1200         if (in->no_new_privs)
1201                 blobmsg_add_u8(b, "no_new_privs", true);
1202
1203         if (in->seccomp)
1204                 blobmsg_add_string(b, "seccomp", in->seccomp);
1205
1206         if (in->pidfile)
1207                 blobmsg_add_string(b, "pidfile", in->pidfile);
1208
1209         if (in->user)
1210                 blobmsg_add_string(b, "user", in->user);
1211
1212         if (in->group)
1213                 blobmsg_add_string(b, "group", in->group);
1214
1215         if (in->has_jail) {
1216                 void *r = blobmsg_open_table(b, "jail");
1217                 if (in->jail.name)
1218                         blobmsg_add_string(b, "name", in->jail.name);
1219                 if (in->jail.hostname)
1220                         blobmsg_add_string(b, "hostname", in->jail.hostname);
1221                 blobmsg_add_u8(b, "procfs", in->jail.procfs);
1222                 blobmsg_add_u8(b, "sysfs", in->jail.sysfs);
1223                 blobmsg_add_u8(b, "ubus", in->jail.ubus);
1224                 blobmsg_add_u8(b, "log", in->jail.log);
1225                 blobmsg_add_u8(b, "ronly", in->jail.ronly);
1226                 blobmsg_close_table(b, r);
1227                 if (!avl_is_empty(&in->jail.mount.avl)) {
1228                         struct blobmsg_list_node *var;
1229                         void *e = blobmsg_open_table(b, "mount");
1230                         blobmsg_list_for_each(&in->jail.mount, var)
1231                                 blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1232                         blobmsg_close_table(b, e);
1233                 }
1234         }
1235
1236         if (verbose && in->trigger)
1237                 blobmsg_add_blob(b, in->trigger);
1238
1239         blobmsg_close_table(b, i);
1240 }