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