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