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