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