service/instance.c

   1 /*
   2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #define _GNU_SOURCE
  16 #include <sys/resource.h>
  17 #include <sys/types.h>
  18 #include <sys/socket.h>
  19 #include <sys/stat.h>
  20 #include <grp.h>
  21 #include <net/if.h>
  22 #include <unistd.h>
  23 #include <stdint.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #include <pwd.h>
  27 #include <libgen.h>
  28 #include <unistd.h>
  29 #define SYSLOG_NAMES
  30 #include <syslog.h>
  31
  32 #include <libubox/md5.h>
  33
  34 #include "../procd.h"
  35
  36 #include "service.h"
  37 #include "instance.h"
  38
  39 #define UJAIL_BIN_PATH "/sbin/ujail"
  40
  41 enum {
  42         INSTANCE_ATTR_COMMAND,
  43         INSTANCE_ATTR_ENV,
  44         INSTANCE_ATTR_DATA,
  45         INSTANCE_ATTR_NETDEV,
  46         INSTANCE_ATTR_FILE,
  47         INSTANCE_ATTR_TRIGGER,
  48         INSTANCE_ATTR_RESPAWN,
  49         INSTANCE_ATTR_NICE,
  50         INSTANCE_ATTR_LIMITS,
  51         INSTANCE_ATTR_WATCH,
  52         INSTANCE_ATTR_ERROR,
  53         INSTANCE_ATTR_USER,
  54         INSTANCE_ATTR_GROUP,
  55         INSTANCE_ATTR_STDOUT,
  56         INSTANCE_ATTR_STDERR,
  57         INSTANCE_ATTR_NO_NEW_PRIVS,
  58         INSTANCE_ATTR_JAIL,
  59         INSTANCE_ATTR_TRACE,
  60         INSTANCE_ATTR_SECCOMP,
  61         INSTANCE_ATTR_PIDFILE,
  62         INSTANCE_ATTR_RELOADSIG,
  63         INSTANCE_ATTR_TERMTIMEOUT,
  64         INSTANCE_ATTR_FACILITY,
  65         __INSTANCE_ATTR_MAX
  66 };
  67
  68 static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = {
  69         [INSTANCE_ATTR_COMMAND] = { "command", BLOBMSG_TYPE_ARRAY },
  70         [INSTANCE_ATTR_ENV] = { "env", BLOBMSG_TYPE_TABLE },
  71         [INSTANCE_ATTR_DATA] = { "data", BLOBMSG_TYPE_TABLE },
  72         [INSTANCE_ATTR_NETDEV] = { "netdev", BLOBMSG_TYPE_ARRAY },
  73         [INSTANCE_ATTR_FILE] = { "file", BLOBMSG_TYPE_ARRAY },
  74         [INSTANCE_ATTR_TRIGGER] = { "triggers", BLOBMSG_TYPE_ARRAY },
  75         [INSTANCE_ATTR_RESPAWN] = { "respawn", BLOBMSG_TYPE_ARRAY },
  76         [INSTANCE_ATTR_NICE] = { "nice", BLOBMSG_TYPE_INT32 },
  77         [INSTANCE_ATTR_LIMITS] = { "limits", BLOBMSG_TYPE_TABLE },
  78         [INSTANCE_ATTR_WATCH] = { "watch", BLOBMSG_TYPE_ARRAY },
  79         [INSTANCE_ATTR_ERROR] = { "error", BLOBMSG_TYPE_ARRAY },
  80         [INSTANCE_ATTR_USER] = { "user", BLOBMSG_TYPE_STRING },
  81         [INSTANCE_ATTR_GROUP] = { "group", BLOBMSG_TYPE_STRING },
  82         [INSTANCE_ATTR_STDOUT] = { "stdout", BLOBMSG_TYPE_BOOL },
  83         [INSTANCE_ATTR_STDERR] = { "stderr", BLOBMSG_TYPE_BOOL },
  84         [INSTANCE_ATTR_NO_NEW_PRIVS] = { "no_new_privs", BLOBMSG_TYPE_BOOL },
  85         [INSTANCE_ATTR_JAIL] = { "jail", BLOBMSG_TYPE_TABLE },
  86         [INSTANCE_ATTR_TRACE] = { "trace", BLOBMSG_TYPE_BOOL },
  87         [INSTANCE_ATTR_SECCOMP] = { "seccomp", BLOBMSG_TYPE_STRING },
  88         [INSTANCE_ATTR_PIDFILE] = { "pidfile", BLOBMSG_TYPE_STRING },
  89         [INSTANCE_ATTR_RELOADSIG] = { "reload_signal", BLOBMSG_TYPE_INT32 },
  90         [INSTANCE_ATTR_TERMTIMEOUT] = { "term_timeout", BLOBMSG_TYPE_INT32 },
  91         [INSTANCE_ATTR_FACILITY] = { "facility", BLOBMSG_TYPE_STRING },
  92 };
  93
  94 enum {
  95         JAIL_ATTR_NAME,
  96         JAIL_ATTR_HOSTNAME,
  97         JAIL_ATTR_PROCFS,
  98         JAIL_ATTR_SYSFS,
  99         JAIL_ATTR_UBUS,
 100         JAIL_ATTR_LOG,
 101         JAIL_ATTR_RONLY,
 102         JAIL_ATTR_MOUNT,
 103         JAIL_ATTR_NETNS,
 104         __JAIL_ATTR_MAX,
 105 };
 106
 107 static const struct blobmsg_policy jail_attr[__JAIL_ATTR_MAX] = {
 108         [JAIL_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 109         [JAIL_ATTR_HOSTNAME] = { "hostname", BLOBMSG_TYPE_STRING },
 110         [JAIL_ATTR_PROCFS] = { "procfs", BLOBMSG_TYPE_BOOL },
 111         [JAIL_ATTR_SYSFS] = { "sysfs", BLOBMSG_TYPE_BOOL },
 112         [JAIL_ATTR_UBUS] = { "ubus", BLOBMSG_TYPE_BOOL },
 113         [JAIL_ATTR_LOG] = { "log", BLOBMSG_TYPE_BOOL },
 114         [JAIL_ATTR_RONLY] = { "ronly", BLOBMSG_TYPE_BOOL },
 115         [JAIL_ATTR_MOUNT] = { "mount", BLOBMSG_TYPE_TABLE },
 116         [JAIL_ATTR_NETNS] = { "netns", BLOBMSG_TYPE_BOOL },
 117 };
 118
 119 struct instance_netdev {
 120         struct blobmsg_list_node node;
 121         int ifindex;
 122 };
 123
 124 struct instance_file {
 125         struct blobmsg_list_node node;
 126         uint32_t md5[4];
 127 };
 128
 129 struct rlimit_name {
 130         const char *name;
 131         int resource;
 132 };
 133
 134 static const struct rlimit_name rlimit_names[] = {
 135         { "as", RLIMIT_AS },
 136         { "core", RLIMIT_CORE },
 137         { "cpu", RLIMIT_CPU },
 138         { "data", RLIMIT_DATA },
 139         { "fsize", RLIMIT_FSIZE },
 140         { "memlock", RLIMIT_MEMLOCK },
 141         { "nofile", RLIMIT_NOFILE },
 142         { "nproc", RLIMIT_NPROC },
 143         { "rss", RLIMIT_RSS },
 144         { "stack", RLIMIT_STACK },
 145 #ifdef linux
 146         { "nice", RLIMIT_NICE },
 147         { "rtprio", RLIMIT_RTPRIO },
 148         { "msgqueue", RLIMIT_MSGQUEUE },
 149         { "sigpending", RLIMIT_SIGPENDING },
 150 #endif
 151         { NULL, 0 }
 152 };
 153
 154 static void closefd(int fd)
 155 {
 156         if (fd > STDERR_FILENO)
 157                 close(fd);
 158 }
 159
 160 /* convert a string into numeric syslog facility or return -1 if no match found */
 161 static int
 162 syslog_facility_str_to_int(const char *facility)
 163 {
 164         CODE *p = facilitynames;
 165
 166         while (p->c_name && strcasecmp(p->c_name, facility))
 167                 p++;
 168
 169         return p->c_val;
 170 }
 171
 172 static void
 173 instance_limits(const char *limit, const char *value)
 174 {
 175         int i;
 176         struct rlimit rlim;
 177         unsigned long cur, max;
 178
 179         for (i = 0; rlimit_names[i].name != NULL; i++) {
 180                 if (strcmp(rlimit_names[i].name, limit))
 181                         continue;
 182                 if (!strcmp(value, "unlimited")) {
 183                         rlim.rlim_cur = RLIM_INFINITY;
 184                         rlim.rlim_max = RLIM_INFINITY;
 185                 } else {
 186                         if (getrlimit(rlimit_names[i].resource, &rlim))
 187                                 return;
 188
 189                         cur = rlim.rlim_cur;
 190                         max = rlim.rlim_max;
 191
 192                         if (sscanf(value, "%lu %lu", &cur, &max) < 1)
 193                                 return;
 194
 195                         rlim.rlim_cur = cur;
 196                         rlim.rlim_max = max;
 197                 }
 198
 199                 setrlimit(rlimit_names[i].resource, &rlim);
 200                 return;
 201         }
 202 }
 203
 204 static inline int
 205 jail_run(struct service_instance *in, char **argv)
 206 {
 207         struct blobmsg_list_node *var;
 208         struct jail *jail = &in->jail;
 209         int argc = 0;
 210
 211         argv[argc++] = UJAIL_BIN_PATH;
 212
 213         if (jail->name) {
 214                 argv[argc++] = "-n";
 215                 argv[argc++] = jail->name;
 216         }
 217
 218         if (jail->hostname) {
 219                 argv[argc++] = "-h";
 220                 argv[argc++] = jail->hostname;
 221         }
 222
 223         if (in->seccomp) {
 224                 argv[argc++] = "-S";
 225                 argv[argc++] = in->seccomp;
 226         }
 227
 228         if (in->user) {
 229                 argv[argc++] = "-U";
 230                 argv[argc++] = in->user;
 231         }
 232
 233         if (in->group) {
 234                 argv[argc++] = "-G";
 235                 argv[argc++] = in->group;
 236         }
 237
 238         if (in->no_new_privs)
 239                 argv[argc++] = "-c";
 240
 241         if (jail->procfs)
 242                 argv[argc++] = "-p";
 243
 244         if (jail->sysfs)
 245                 argv[argc++] = "-s";
 246
 247         if (jail->ubus)
 248                 argv[argc++] = "-u";
 249
 250         if (jail->log)
 251                 argv[argc++] = "-l";
 252
 253         if (jail->ronly)
 254                 argv[argc++] = "-o";
 255
 256         if (jail->netns)
 257                 argv[argc++] = "-N";
 258
 259         blobmsg_list_for_each(&jail->mount, var) {
 260                 const char *type = blobmsg_data(var->data);
 261
 262                 if (*type == '1')
 263                         argv[argc++] = "-w";
 264                 else
 265                         argv[argc++] = "-r";
 266                 argv[argc++] = (char *) blobmsg_name(var->data);
 267         }
 268
 269         argv[argc++] = "--";
 270
 271         return argc;
 272 }
 273
 274 static int
 275 instance_removepid(struct service_instance *in) {
 276         if (!in->pidfile)
 277                 return 0;
 278         if (unlink(in->pidfile)) {
 279                 ERROR("Failed to remove pidfile: %s: %m\n", in->pidfile);
 280                 return 1;
 281         }
 282         return 0;
 283 }
 284
 285 static int
 286 instance_writepid(struct service_instance *in)
 287 {
 288         FILE *_pidfile;
 289
 290         if (!in->pidfile) {
 291                 return 0;
 292         }
 293         _pidfile = fopen(in->pidfile, "w");
 294         if (_pidfile == NULL) {
 295                 ERROR("failed to open pidfile for writing: %s: %m", in->pidfile);
 296                 return 1;
 297         }
 298         if (fprintf(_pidfile, "%d\n", in->proc.pid) < 0) {
 299                 ERROR("failed to write pidfile: %s: %m", in->pidfile);
 300                 fclose(_pidfile);
 301                 return 2;
 302         }
 303         if (fclose(_pidfile)) {
 304                 ERROR("failed to close pidfile: %s: %m", in->pidfile);
 305                 return 3;
 306         }
 307
 308         return 0;
 309 }
 310
 311 static void
 312 instance_run(struct service_instance *in, int _stdout, int _stderr)
 313 {
 314         struct blobmsg_list_node *var;
 315         struct blob_attr *cur;
 316         char **argv;
 317         int argc = 1; /* NULL terminated */
 318         int rem, _stdin;
 319         bool seccomp = !in->trace && !in->has_jail && in->seccomp;
 320         bool setlbf = _stdout >= 0;
 321
 322         if (in->nice)
 323                 setpriority(PRIO_PROCESS, 0, in->nice);
 324
 325         blobmsg_for_each_attr(cur, in->command, rem)
 326                 argc++;
 327
 328         blobmsg_list_for_each(&in->env, var)
 329                 setenv(blobmsg_name(var->data), blobmsg_data(var->data), 1);
 330
 331         if (seccomp)
 332                 setenv("SECCOMP_FILE", in->seccomp, 1);
 333
 334         if (setlbf)
 335                 setenv("LD_PRELOAD", "/lib/libsetlbf.so", 1);
 336
 337         blobmsg_list_for_each(&in->limits, var)
 338                 instance_limits(blobmsg_name(var->data), blobmsg_data(var->data));
 339
 340         if (in->trace || seccomp)
 341                 argc += 1;
 342
 343         argv = alloca(sizeof(char *) * (argc + in->jail.argc));
 344         argc = 0;
 345
 346 #ifdef SECCOMP_SUPPORT
 347         if (in->trace)
 348                 argv[argc++] = "/sbin/utrace";
 349         else if (seccomp)
 350                 argv[argc++] = "/sbin/seccomp-trace";
 351 #else
 352         if (in->trace || seccomp)
 353                 ULOG_WARN("Seccomp support for %s::%s not available\n", in->srv->name, in->name);
 354 #endif
 355
 356         if (in->has_jail) {
 357                 argc = jail_run(in, argv);
 358                 if (argc != in->jail.argc)
 359                         ULOG_WARN("expected %i jail params, used %i for %s::%s\n",
 360                                 in->jail.argc, argc, in->srv->name, in->name);
 361         }
 362
 363         blobmsg_for_each_attr(cur, in->command, rem)
 364                 argv[argc++] = blobmsg_data(cur);
 365
 366         argv[argc] = NULL;
 367
 368         _stdin = open("/dev/null", O_RDONLY);
 369
 370         if (_stdout == -1)
 371                 _stdout = open("/dev/null", O_WRONLY);
 372
 373         if (_stderr == -1)
 374                 _stderr = open("/dev/null", O_WRONLY);
 375
 376         if (_stdin > -1) {
 377                 dup2(_stdin, STDIN_FILENO);
 378                 closefd(_stdin);
 379         }
 380         if (_stdout > -1) {
 381                 dup2(_stdout, STDOUT_FILENO);
 382                 closefd(_stdout);
 383         }
 384         if (_stderr > -1) {
 385                 dup2(_stderr, STDERR_FILENO);
 386                 closefd(_stderr);
 387         }
 388
 389         if (!in->has_jail && in->user && in->pw_gid && initgroups(in->user, in->pw_gid)) {
 390                 ERROR("failed to initgroups() for user %s: %m\n", in->user);
 391                 exit(127);
 392         }
 393         if (!in->has_jail && in->gr_gid && setgid(in->gr_gid)) {
 394                 ERROR("failed to set group id %d: %m\n", in->gr_gid);
 395                 exit(127);
 396         }
 397         if (!in->has_jail && in->uid && setuid(in->uid)) {
 398                 ERROR("failed to set user id %d: %m\n", in->uid);
 399                 exit(127);
 400         }
 401
 402         execvp(argv[0], argv);
 403         exit(127);
 404 }
 405
 406 static void
 407 instance_free_stdio(struct service_instance *in)
 408 {
 409         if (in->_stdout.fd.fd > -1) {
 410                 ustream_free(&in->_stdout.stream);
 411                 close(in->_stdout.fd.fd);
 412                 in->_stdout.fd.fd = -1;
 413         }
 414
 415         if (in->_stderr.fd.fd > -1) {
 416                 ustream_free(&in->_stderr.stream);
 417                 close(in->_stderr.fd.fd);
 418                 in->_stderr.fd.fd = -1;
 419         }
 420 }
 421
 422 void
 423 instance_start(struct service_instance *in)
 424 {
 425         int pid;
 426         int opipe[2] = { -1, -1 };
 427         int epipe[2] = { -1, -1 };
 428
 429         if (!avl_is_empty(&in->errors.avl)) {
 430                 LOG("Not starting instance %s::%s, an error was indicated\n", in->srv->name, in->name);
 431                 return;
 432         }
 433
 434         if (!in->command) {
 435                 LOG("Not starting instance %s::%s, command not set\n", in->srv->name, in->name);
 436                 return;
 437         }
 438
 439         if (in->proc.pending) {
 440                 if (in->halt)
 441                         in->restart = true;
 442                 return;
 443         }
 444
 445         instance_free_stdio(in);
 446         if (in->_stdout.fd.fd > -2) {
 447                 if (pipe(opipe)) {
 448                         ULOG_WARN("pipe() failed: %m\n");
 449                         opipe[0] = opipe[1] = -1;
 450                 }
 451         }
 452
 453         if (in->_stderr.fd.fd > -2) {
 454                 if (pipe(epipe)) {
 455                         ULOG_WARN("pipe() failed: %m\n");
 456                         epipe[0] = epipe[1] = -1;
 457                 }
 458         }
 459
 460         in->restart = false;
 461         in->halt = false;
 462
 463         if (!in->valid)
 464                 return;
 465
 466         pid = fork();
 467         if (pid < 0)
 468                 return;
 469
 470         if (!pid) {
 471                 uloop_done();
 472                 closefd(opipe[0]);
 473                 closefd(epipe[0]);
 474                 instance_run(in, opipe[1], epipe[1]);
 475                 return;
 476         }
 477
 478         DEBUG(2, "Started instance %s::%s[%d]\n", in->srv->name, in->name, pid);
 479         in->proc.pid = pid;
 480         instance_writepid(in);
 481         clock_gettime(CLOCK_MONOTONIC, &in->start);
 482         uloop_process_add(&in->proc);
 483
 484         if (opipe[0] > -1) {
 485                 ustream_fd_init(&in->_stdout, opipe[0]);
 486                 closefd(opipe[1]);
 487                 fcntl(opipe[0], F_SETFD, FD_CLOEXEC);
 488         }
 489
 490         if (epipe[0] > -1) {
 491                 ustream_fd_init(&in->_stderr, epipe[0]);
 492                 closefd(epipe[1]);
 493                 fcntl(epipe[0], F_SETFD, FD_CLOEXEC);
 494         }
 495
 496         service_event("instance.start", in->srv->name, in->name);
 497 }
 498
 499 static void
 500 instance_stdio(struct ustream *s, int prio, struct service_instance *in)
 501 {
 502         char *newline, *str, *arg0, ident[32];
 503         int len;
 504
 505         arg0 = basename(blobmsg_data(blobmsg_data(in->command)));
 506         snprintf(ident, sizeof(ident), "%s[%d]", arg0, in->proc.pid);
 507         ulog_open(ULOG_SYSLOG, in->syslog_facility, ident);
 508
 509         do {
 510                 str = ustream_get_read_buf(s, &len);
 511                 if (!str)
 512                         break;
 513
 514                 newline = memchr(str, '\n', len);
 515                 if (!newline && (s->r.buffer_len != len))
 516                         break;
 517
 518                 if (newline) {
 519                         *newline = 0;
 520                         len = newline + 1 - str;
 521                 }
 522                 ulog(prio, "%s\n", str);
 523
 524                 ustream_consume(s, len);
 525         } while (1);
 526
 527         ulog_open(ULOG_SYSLOG, LOG_DAEMON, "procd");
 528 }
 529
 530 static void
 531 instance_stdout(struct ustream *s, int bytes)
 532 {
 533         instance_stdio(s, LOG_INFO,
 534                        container_of(s, struct service_instance, _stdout.stream));
 535 }
 536
 537 static void
 538 instance_stderr(struct ustream *s, int bytes)
 539 {
 540         instance_stdio(s, LOG_ERR,
 541                        container_of(s, struct service_instance, _stderr.stream));
 542 }
 543
 544 static void
 545 instance_timeout(struct uloop_timeout *t)
 546 {
 547         struct service_instance *in;
 548
 549         in = container_of(t, struct service_instance, timeout);
 550
 551         if (in->halt) {
 552                 LOG("Instance %s::%s pid %d not stopped on SIGTERM, sending SIGKILL instead\n",
 553                                 in->srv->name, in->name, in->proc.pid);
 554                 kill(in->proc.pid, SIGKILL);
 555         } else if (in->restart || in->respawn)
 556                 instance_start(in);
 557 }
 558
 559 static void
 560 instance_delete(struct service_instance *in)
 561 {
 562         struct service *s = in->srv;
 563
 564         avl_delete(&s->instances.avl, &in->node.avl);
 565         instance_free(in);
 566         service_stopped(s);
 567 }
 568
 569 static void
 570 instance_exit(struct uloop_process *p, int ret)
 571 {
 572         struct service_instance *in;
 573         struct timespec tp;
 574         long runtime;
 575
 576         in = container_of(p, struct service_instance, proc);
 577
 578         clock_gettime(CLOCK_MONOTONIC, &tp);
 579         runtime = tp.tv_sec - in->start.tv_sec;
 580
 581         DEBUG(2, "Instance %s::%s exit with error code %d after %ld seconds\n", in->srv->name, in->name, ret, runtime);
 582
 583         uloop_timeout_cancel(&in->timeout);
 584         service_event("instance.stop", in->srv->name, in->name);
 585
 586         if (in->halt) {
 587                 instance_removepid(in);
 588                 if (in->restart)
 589                         instance_start(in);
 590                 else
 591                         instance_delete(in);
 592         } else if (in->restart) {
 593                 instance_start(in);
 594         } else if (in->respawn) {
 595                 if (runtime < in->respawn_threshold)
 596                         in->respawn_count++;
 597                 else
 598                         in->respawn_count = 0;
 599                 if (in->respawn_count > in->respawn_retry && in->respawn_retry > 0 ) {
 600                         LOG("Instance %s::%s s in a crash loop %d crashes, %ld seconds since last crash\n",
 601                                                                 in->srv->name, in->name, in->respawn_count, runtime);
 602                         in->restart = in->respawn = 0;
 603                         in->halt = 1;
 604                         service_event("instance.fail", in->srv->name, in->name);
 605                 } else {
 606                         service_event("instance.respawn", in->srv->name, in->name);
 607                         uloop_timeout_set(&in->timeout, in->respawn_timeout * 1000);
 608                 }
 609         }
 610 }
 611
 612 void
 613 instance_stop(struct service_instance *in, bool halt)
 614 {
 615         if (!in->proc.pending) {
 616                 if (halt)
 617                         instance_delete(in);
 618                 return;
 619         }
 620         in->halt = halt;
 621         in->restart = in->respawn = false;
 622         kill(in->proc.pid, SIGTERM);
 623         uloop_timeout_set(&in->timeout, in->term_timeout * 1000);
 624 }
 625
 626 static void
 627 instance_restart(struct service_instance *in)
 628 {
 629         if (!in->proc.pending)
 630                 return;
 631
 632         if (in->reload_signal) {
 633                 kill(in->proc.pid, in->reload_signal);
 634                 return;
 635         }
 636
 637         in->halt = true;
 638         in->restart = true;
 639         kill(in->proc.pid, SIGTERM);
 640         uloop_timeout_set(&in->timeout, in->term_timeout * 1000);
 641 }
 642
 643 static bool string_changed(const char *a, const char *b)
 644 {
 645         return !((!a && !b) || (a && b && !strcmp(a, b)));
 646 }
 647
 648 static bool
 649 instance_config_changed(struct service_instance *in, struct service_instance *in_new)
 650 {
 651         if (!in->valid)
 652                 return true;
 653
 654         if (!blob_attr_equal(in->command, in_new->command))
 655                 return true;
 656
 657         if (!blobmsg_list_equal(&in->env, &in_new->env))
 658                 return true;
 659
 660         if (!blobmsg_list_equal(&in->netdev, &in_new->netdev))
 661                 return true;
 662
 663         if (!blobmsg_list_equal(&in->file, &in_new->file))
 664                 return true;
 665
 666         if (in->nice != in_new->nice)
 667                 return true;
 668
 669         if (in->syslog_facility != in_new->syslog_facility)
 670                 return true;
 671
 672         if (string_changed(in->user, in_new->user))
 673                 return true;
 674
 675         if (string_changed(in->group, in_new->group))
 676                 return true;
 677
 678         if (in->uid != in_new->uid)
 679                 return true;
 680
 681         if (in->pw_gid != in_new->pw_gid)
 682                 return true;
 683
 684         if (string_changed(in->pidfile, in_new->pidfile))
 685                 return true;
 686
 687         if (in->respawn_retry != in_new->respawn_retry)
 688                 return true;
 689         if (in->respawn_threshold != in_new->respawn_threshold)
 690                 return true;
 691         if (in->respawn_timeout != in_new->respawn_timeout)
 692                 return true;
 693
 694         if ((!in->seccomp && in_new->seccomp) ||
 695             (in->seccomp && !in_new->seccomp) ||
 696             (in->seccomp && in_new->seccomp && strcmp(in->seccomp, in_new->seccomp)))
 697                 return true;
 698
 699         if (!blobmsg_list_equal(&in->limits, &in_new->limits))
 700                 return true;
 701
 702         if (!blobmsg_list_equal(&in->jail.mount, &in_new->jail.mount))
 703                 return true;
 704
 705         if (!blobmsg_list_equal(&in->errors, &in_new->errors))
 706                 return true;
 707
 708         return false;
 709 }
 710
 711 static bool
 712 instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 713 {
 714         struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
 715         struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
 716
 717         return n1->ifindex == n2->ifindex;
 718 }
 719
 720 static void
 721 instance_netdev_update(struct blobmsg_list_node *l)
 722 {
 723         struct instance_netdev *n = container_of(l, struct instance_netdev, node);
 724
 725         n->ifindex = if_nametoindex(n->node.avl.key);
 726 }
 727
 728 static bool
 729 instance_file_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 730 {
 731         struct instance_file *f1 = container_of(l1, struct instance_file, node);
 732         struct instance_file *f2 = container_of(l2, struct instance_file, node);
 733
 734         return !memcmp(f1->md5, f2->md5, sizeof(f1->md5));
 735 }
 736
 737 static void
 738 instance_file_update(struct blobmsg_list_node *l)
 739 {
 740         struct instance_file *f = container_of(l, struct instance_file, node);
 741         md5_ctx_t md5;
 742         char buf[256];
 743         int len, fd;
 744
 745         memset(f->md5, 0, sizeof(f->md5));
 746
 747         fd = open(l->avl.key, O_RDONLY);
 748         if (fd < 0)
 749                 return;
 750
 751         md5_begin(&md5);
 752         do {
 753                 len = read(fd, buf, sizeof(buf));
 754                 if (len < 0) {
 755                         if (errno == EINTR)
 756                                 continue;
 757
 758                         break;
 759                 }
 760                 if (!len)
 761                         break;
 762
 763                 md5_hash(buf, len, &md5);
 764         } while(1);
 765
 766         md5_end(f->md5, &md5);
 767         close(fd);
 768 }
 769
 770 static void
 771 instance_fill_any(struct blobmsg_list *l, struct blob_attr *cur)
 772 {
 773         if (!cur)
 774                 return;
 775
 776         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), false);
 777 }
 778
 779 static bool
 780 instance_fill_array(struct blobmsg_list *l, struct blob_attr *cur, blobmsg_update_cb cb, bool array)
 781 {
 782         struct blobmsg_list_node *node;
 783
 784         if (!cur)
 785                 return true;
 786
 787         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 788                 return false;
 789
 790         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), array);
 791         if (cb) {
 792                 blobmsg_list_for_each(l, node)
 793                         cb(node);
 794         }
 795         return true;
 796 }
 797
 798 static int
 799 instance_jail_parse(struct service_instance *in, struct blob_attr *attr)
 800 {
 801         struct blob_attr *tb[__JAIL_ATTR_MAX];
 802         struct jail *jail = &in->jail;
 803         struct stat s;
 804         int r;
 805
 806         r = stat(UJAIL_BIN_PATH, &s);
 807         if (r < 0) {
 808                 ERROR("unable to find %s: %m (%d)\n", UJAIL_BIN_PATH, r);
 809                 return 0;
 810         }
 811
 812         blobmsg_parse(jail_attr, __JAIL_ATTR_MAX, tb,
 813                 blobmsg_data(attr), blobmsg_data_len(attr));
 814
 815         jail->argc = 2;
 816
 817         if (tb[JAIL_ATTR_NAME]) {
 818                 jail->name = strdup(blobmsg_get_string(tb[JAIL_ATTR_NAME]));
 819                 jail->argc += 2;
 820         }
 821         if (tb[JAIL_ATTR_HOSTNAME]) {
 822                 jail->hostname = strdup(blobmsg_get_string(tb[JAIL_ATTR_HOSTNAME]));
 823                 jail->argc += 2;
 824         }
 825         if (tb[JAIL_ATTR_PROCFS]) {
 826                 jail->procfs = blobmsg_get_bool(tb[JAIL_ATTR_PROCFS]);
 827                 jail->argc++;
 828         }
 829         if (tb[JAIL_ATTR_SYSFS]) {
 830                 jail->sysfs = blobmsg_get_bool(tb[JAIL_ATTR_SYSFS]);
 831                 jail->argc++;
 832         }
 833         if (tb[JAIL_ATTR_UBUS]) {
 834                 jail->ubus = blobmsg_get_bool(tb[JAIL_ATTR_UBUS]);
 835                 jail->argc++;
 836         }
 837         if (tb[JAIL_ATTR_LOG]) {
 838                 jail->log = blobmsg_get_bool(tb[JAIL_ATTR_LOG]);
 839                 jail->argc++;
 840         }
 841         if (tb[JAIL_ATTR_RONLY]) {
 842                 jail->ronly = blobmsg_get_bool(tb[JAIL_ATTR_RONLY]);
 843                 jail->argc++;
 844         }
 845         if (tb[JAIL_ATTR_NETNS]) {
 846                 jail->netns = blobmsg_get_bool(tb[JAIL_ATTR_NETNS]);
 847                 jail->argc++;
 848         }
 849         if (tb[JAIL_ATTR_MOUNT]) {
 850                 struct blob_attr *cur;
 851                 int rem;
 852
 853                 blobmsg_for_each_attr(cur, tb[JAIL_ATTR_MOUNT], rem)
 854                         jail->argc += 2;
 855                 instance_fill_array(&jail->mount, tb[JAIL_ATTR_MOUNT], NULL, false);
 856         }
 857         if (in->seccomp)
 858                 jail->argc += 2;
 859
 860         if (in->user)
 861                 jail->argc += 2;
 862
 863         if (in->group)
 864                 jail->argc += 2;
 865
 866         if (in->no_new_privs)
 867                 jail->argc++;
 868
 869         return 1;
 870 }
 871
 872 static bool
 873 instance_config_parse_command(struct service_instance *in, struct blob_attr **tb)
 874 {
 875         struct blob_attr *cur, *cur2;
 876         bool ret = false;
 877         int rem;
 878
 879         cur = tb[INSTANCE_ATTR_COMMAND];
 880         if (!cur) {
 881                 in->command = NULL;
 882                 return true;
 883         }
 884
 885         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 886                 return false;
 887
 888         blobmsg_for_each_attr(cur2, cur, rem) {
 889                 ret = true;
 890                 break;
 891         }
 892
 893         in->command = cur;
 894         return ret;
 895 }
 896
 897 static bool
 898 instance_config_parse(struct service_instance *in)
 899 {
 900         struct blob_attr *tb[__INSTANCE_ATTR_MAX];
 901         struct blob_attr *cur, *cur2;
 902         int rem;
 903
 904         blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
 905                 blobmsg_data(in->config), blobmsg_data_len(in->config));
 906
 907         if (!instance_config_parse_command(in, tb))
 908                 return false;
 909
 910         if (tb[INSTANCE_ATTR_TERMTIMEOUT])
 911                 in->term_timeout = blobmsg_get_u32(tb[INSTANCE_ATTR_TERMTIMEOUT]);
 912         if (tb[INSTANCE_ATTR_RESPAWN]) {
 913                 int i = 0;
 914                 uint32_t vals[3] = { 3600, 5, 5};
 915
 916                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_RESPAWN], rem) {
 917                         if ((i >= 3) && (blobmsg_type(cur2) == BLOBMSG_TYPE_STRING))
 918                                 continue;
 919                         vals[i] = atoi(blobmsg_get_string(cur2));
 920                         i++;
 921                 }
 922                 in->respawn = true;
 923                 in->respawn_count = 0;
 924                 in->respawn_threshold = vals[0];
 925                 in->respawn_timeout = vals[1];
 926                 in->respawn_retry = vals[2];
 927         }
 928         if (tb[INSTANCE_ATTR_TRIGGER]) {
 929                 in->trigger = tb[INSTANCE_ATTR_TRIGGER];
 930                 trigger_add(in->trigger, in);
 931         }
 932
 933         if (tb[INSTANCE_ATTR_WATCH]) {
 934                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_WATCH], rem) {
 935                         if (blobmsg_type(cur2) != BLOBMSG_TYPE_STRING)
 936                                 continue;
 937                         DEBUG(3, "watch for %s\n", blobmsg_get_string(cur2));
 938                         watch_add(blobmsg_get_string(cur2), in);
 939                 }
 940         }
 941
 942         if ((cur = tb[INSTANCE_ATTR_NICE])) {
 943                 in->nice = (int8_t) blobmsg_get_u32(cur);
 944                 if (in->nice < -20 || in->nice > 20)
 945                         return false;
 946         }
 947
 948         if (tb[INSTANCE_ATTR_USER]) {
 949                 const char *user = blobmsg_get_string(tb[INSTANCE_ATTR_USER]);
 950                 struct passwd *p = getpwnam(user);
 951                 if (p) {
 952                         in->user = strdup(user);
 953                         in->uid = p->pw_uid;
 954                         in->gr_gid = in->pw_gid = p->pw_gid;
 955                 }
 956         }
 957
 958         if (tb[INSTANCE_ATTR_GROUP]) {
 959                 const char *group = blobmsg_get_string(tb[INSTANCE_ATTR_GROUP]);
 960                 struct group *p = getgrnam(group);
 961                 if (p) {
 962                         in->group = strdup(group);
 963                         in->gr_gid = p->gr_gid;
 964                 }
 965         }
 966
 967         if (tb[INSTANCE_ATTR_TRACE])
 968                 in->trace = blobmsg_get_bool(tb[INSTANCE_ATTR_TRACE]);
 969
 970         if (tb[INSTANCE_ATTR_NO_NEW_PRIVS])
 971                 in->no_new_privs = blobmsg_get_bool(tb[INSTANCE_ATTR_NO_NEW_PRIVS]);
 972
 973         if (!in->trace && tb[INSTANCE_ATTR_SECCOMP])
 974                 in->seccomp = strdup(blobmsg_get_string(tb[INSTANCE_ATTR_SECCOMP]));
 975
 976         if (tb[INSTANCE_ATTR_PIDFILE]) {
 977                 char *pidfile = blobmsg_get_string(tb[INSTANCE_ATTR_PIDFILE]);
 978                 if (pidfile)
 979                         in->pidfile = strdup(pidfile);
 980         }
 981
 982         if (tb[INSTANCE_ATTR_RELOADSIG])
 983                 in->reload_signal = blobmsg_get_u32(tb[INSTANCE_ATTR_RELOADSIG]);
 984
 985         if (!in->trace && tb[INSTANCE_ATTR_JAIL])
 986                 in->has_jail = instance_jail_parse(in, tb[INSTANCE_ATTR_JAIL]);
 987
 988         if (tb[INSTANCE_ATTR_STDOUT] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDOUT]))
 989                 in->_stdout.fd.fd = -1;
 990
 991         if (tb[INSTANCE_ATTR_STDERR] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDERR]))
 992                 in->_stderr.fd.fd = -1;
 993
 994         instance_fill_any(&in->data, tb[INSTANCE_ATTR_DATA]);
 995
 996         if (!instance_fill_array(&in->env, tb[INSTANCE_ATTR_ENV], NULL, false))
 997                 return false;
 998
 999         if (!instance_fill_array(&in->netdev, tb[INSTANCE_ATTR_NETDEV], instance_netdev_update, true))
1000                 return false;
1001
1002         if (!instance_fill_array(&in->file, tb[INSTANCE_ATTR_FILE], instance_file_update, true))
1003                 return false;
1004
1005         if (!instance_fill_array(&in->limits, tb[INSTANCE_ATTR_LIMITS], NULL, false))
1006                 return false;
1007
1008         if (!instance_fill_array(&in->errors, tb[INSTANCE_ATTR_ERROR], NULL, true))
1009                 return false;
1010
1011         if (tb[INSTANCE_ATTR_FACILITY]) {
1012                 int facility = syslog_facility_str_to_int(blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
1013                 if (facility != -1) {
1014                         in->syslog_facility = facility;
1015                         DEBUG(3, "setting facility '%s'\n", blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
1016                 } else
1017                         DEBUG(3, "unknown syslog facility '%s' given, using default (LOG_DAEMON)\n", blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
1018         }
1019
1020         return true;
1021 }
1022
1023 static void
1024 instance_config_cleanup(struct service_instance *in)
1025 {
1026         blobmsg_list_free(&in->env);
1027         blobmsg_list_free(&in->data);
1028         blobmsg_list_free(&in->netdev);
1029         blobmsg_list_free(&in->file);
1030         blobmsg_list_free(&in->limits);
1031         blobmsg_list_free(&in->errors);
1032         blobmsg_list_free(&in->jail.mount);
1033 }
1034
1035 static void
1036 instance_config_move_strdup(char **dst, char *src)
1037 {
1038         if (*dst) {
1039                 free(*dst);
1040                 *dst = NULL;
1041         }
1042
1043         if (!src)
1044                 return;
1045
1046         *dst = strdup(src);
1047 }
1048
1049 static void
1050 instance_config_move(struct service_instance *in, struct service_instance *in_src)
1051 {
1052         instance_config_cleanup(in);
1053         blobmsg_list_move(&in->env, &in_src->env);
1054         blobmsg_list_move(&in->data, &in_src->data);
1055         blobmsg_list_move(&in->netdev, &in_src->netdev);
1056         blobmsg_list_move(&in->file, &in_src->file);
1057         blobmsg_list_move(&in->limits, &in_src->limits);
1058         blobmsg_list_move(&in->errors, &in_src->errors);
1059         blobmsg_list_move(&in->jail.mount, &in_src->jail.mount);
1060         in->trigger = in_src->trigger;
1061         in->command = in_src->command;
1062         in->respawn = in_src->respawn;
1063         in->respawn_retry = in_src->respawn_retry;
1064         in->respawn_threshold = in_src->respawn_threshold;
1065         in->respawn_timeout = in_src->respawn_timeout;
1066         in->name = in_src->name;
1067         in->trace = in_src->trace;
1068         in->node.avl.key = in_src->node.avl.key;
1069         in->syslog_facility = in_src->syslog_facility;
1070
1071         instance_config_move_strdup(&in->pidfile, in_src->pidfile);
1072         instance_config_move_strdup(&in->seccomp, in_src->seccomp);
1073         instance_config_move_strdup(&in->jail.name, in_src->jail.name);
1074         instance_config_move_strdup(&in->jail.hostname, in_src->jail.hostname);
1075
1076         free(in->config);
1077         in->config = in_src->config;
1078         in_src->config = NULL;
1079 }
1080
1081 void
1082 instance_update(struct service_instance *in, struct service_instance *in_new)
1083 {
1084         bool changed = instance_config_changed(in, in_new);
1085         bool running = in->proc.pending;
1086         bool stopping = in->halt;
1087
1088         if (!running || stopping) {
1089                 instance_config_move(in, in_new);
1090                 instance_start(in);
1091         } else {
1092                 if (changed)
1093                         instance_restart(in);
1094                 instance_config_move(in, in_new);
1095                 /* restart happens in the child callback handler */
1096         }
1097 }
1098
1099 void
1100 instance_free(struct service_instance *in)
1101 {
1102         instance_free_stdio(in);
1103         uloop_process_delete(&in->proc);
1104         uloop_timeout_cancel(&in->timeout);
1105         trigger_del(in);
1106         watch_del(in);
1107         instance_config_cleanup(in);
1108         free(in->config);
1109         free(in->user);
1110         free(in->group);
1111         free(in->jail.name);
1112         free(in->jail.hostname);
1113         free(in->seccomp);
1114         free(in->pidfile);
1115         free(in);
1116 }
1117
1118 void
1119 instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
1120 {
1121         config = blob_memdup(config);
1122         in->srv = s;
1123         in->name = blobmsg_name(config);
1124         in->config = config;
1125         in->timeout.cb = instance_timeout;
1126         in->proc.cb = instance_exit;
1127         in->term_timeout = 5;
1128         in->syslog_facility = LOG_DAEMON;
1129
1130         in->_stdout.fd.fd = -2;
1131         in->_stdout.stream.string_data = true;
1132         in->_stdout.stream.notify_read = instance_stdout;
1133
1134         in->_stderr.fd.fd = -2;
1135         in->_stderr.stream.string_data = true;
1136         in->_stderr.stream.notify_read = instance_stderr;
1137
1138         blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
1139         blobmsg_list_init(&in->file, struct instance_file, node, instance_file_cmp);
1140         blobmsg_list_simple_init(&in->env);
1141         blobmsg_list_simple_init(&in->data);
1142         blobmsg_list_simple_init(&in->limits);
1143         blobmsg_list_simple_init(&in->errors);
1144         blobmsg_list_simple_init(&in->jail.mount);
1145         in->valid = instance_config_parse(in);
1146 }
1147
1148 void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
1149 {
1150         void *i;
1151
1152         if (!in->valid)
1153                 return;
1154
1155         i = blobmsg_open_table(b, in->name);
1156         blobmsg_add_u8(b, "running", in->proc.pending);
1157         if (in->proc.pending)
1158                 blobmsg_add_u32(b, "pid", in->proc.pid);
1159         if (in->command)
1160                 blobmsg_add_blob(b, in->command);
1161         blobmsg_add_u32(b, "term_timeout", in->term_timeout);
1162
1163         if (!avl_is_empty(&in->errors.avl)) {
1164                 struct blobmsg_list_node *var;
1165                 void *e = blobmsg_open_array(b, "errors");
1166                 blobmsg_list_for_each(&in->errors, var)
1167                         blobmsg_add_string(b, NULL, blobmsg_data(var->data));
1168                 blobmsg_close_table(b, e);
1169         }
1170
1171         if (!avl_is_empty(&in->env.avl)) {
1172                 struct blobmsg_list_node *var;
1173                 void *e = blobmsg_open_table(b, "env");
1174                 blobmsg_list_for_each(&in->env, var)
1175                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1176                 blobmsg_close_table(b, e);
1177         }
1178
1179         if (!avl_is_empty(&in->data.avl)) {
1180                 struct blobmsg_list_node *var;
1181                 void *e = blobmsg_open_table(b, "data");
1182                 blobmsg_list_for_each(&in->data, var)
1183                         blobmsg_add_blob(b, var->data);
1184                 blobmsg_close_table(b, e);
1185         }
1186
1187         if (!avl_is_empty(&in->limits.avl)) {
1188                 struct blobmsg_list_node *var;
1189                 void *e = blobmsg_open_table(b, "limits");
1190                 blobmsg_list_for_each(&in->limits, var)
1191                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1192                 blobmsg_close_table(b, e);
1193         }
1194
1195         if (in->reload_signal)
1196                 blobmsg_add_u32(b, "reload_signal", in->reload_signal);
1197
1198         if (in->respawn) {
1199                 void *r = blobmsg_open_table(b, "respawn");
1200                 blobmsg_add_u32(b, "threshold", in->respawn_threshold);
1201                 blobmsg_add_u32(b, "timeout", in->respawn_timeout);
1202                 blobmsg_add_u32(b, "retry", in->respawn_retry);
1203                 blobmsg_close_table(b, r);
1204         }
1205
1206         if (in->trace)
1207                 blobmsg_add_u8(b, "trace", true);
1208
1209         if (in->no_new_privs)
1210                 blobmsg_add_u8(b, "no_new_privs", true);
1211
1212         if (in->seccomp)
1213                 blobmsg_add_string(b, "seccomp", in->seccomp);
1214
1215         if (in->pidfile)
1216                 blobmsg_add_string(b, "pidfile", in->pidfile);
1217
1218         if (in->user)
1219                 blobmsg_add_string(b, "user", in->user);
1220
1221         if (in->group)
1222                 blobmsg_add_string(b, "group", in->group);
1223
1224         if (in->has_jail) {
1225                 void *r = blobmsg_open_table(b, "jail");
1226                 if (in->jail.name)
1227                         blobmsg_add_string(b, "name", in->jail.name);
1228                 if (in->jail.hostname)
1229                         blobmsg_add_string(b, "hostname", in->jail.hostname);
1230                 blobmsg_add_u8(b, "procfs", in->jail.procfs);
1231                 blobmsg_add_u8(b, "sysfs", in->jail.sysfs);
1232                 blobmsg_add_u8(b, "ubus", in->jail.ubus);
1233                 blobmsg_add_u8(b, "log", in->jail.log);
1234                 blobmsg_add_u8(b, "ronly", in->jail.ronly);
1235                 blobmsg_add_u8(b, "netns", in->jail.netns);
1236                 blobmsg_close_table(b, r);
1237                 if (!avl_is_empty(&in->jail.mount.avl)) {
1238                         struct blobmsg_list_node *var;
1239                         void *e = blobmsg_open_table(b, "mount");
1240                         blobmsg_list_for_each(&in->jail.mount, var)
1241                                 blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1242                         blobmsg_close_table(b, e);
1243                 }
1244         }
1245
1246         if (verbose && in->trigger)
1247                 blobmsg_add_blob(b, in->trigger);
1248
1249         blobmsg_close_table(b, i);
1250 }