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
 343         blobmsg_for_each_attr(cur, in->command, rem)
 344                 argv[argc++] = blobmsg_data(cur);
 345
 346         argv[argc] = NULL;
 347
 348         _stdin = open("/dev/null", O_RDONLY);
 349
 350         if (_stdout == -1)
 351                 _stdout = open("/dev/null", O_WRONLY);
 352
 353         if (_stderr == -1)
 354                 _stderr = open("/dev/null", O_WRONLY);
 355
 356         if (_stdin > -1) {
 357                 dup2(_stdin, STDIN_FILENO);
 358                 closefd(_stdin);
 359         }
 360         if (_stdout > -1) {
 361                 dup2(_stdout, STDOUT_FILENO);
 362                 closefd(_stdout);
 363         }
 364         if (_stderr > -1) {
 365                 dup2(_stderr, STDERR_FILENO);
 366                 closefd(_stderr);
 367         }
 368
 369         if (in->user && in->pw_gid && initgroups(in->user, in->pw_gid)) {
 370                 ERROR("failed to initgroups() for user %s: %m\n", in->user);
 371                 exit(127);
 372         }
 373         if (in->gr_gid && setgid(in->gr_gid)) {
 374                 ERROR("failed to set group id %d: %m\n", in->gr_gid);
 375                 exit(127);
 376         }
 377         if (in->uid && setuid(in->uid)) {
 378                 ERROR("failed to set user id %d: %m\n", in->uid);
 379                 exit(127);
 380         }
 381
 382         execvp(argv[0], argv);
 383         exit(127);
 384 }
 385
 386 static void
 387 instance_free_stdio(struct service_instance *in)
 388 {
 389         if (in->_stdout.fd.fd > -1) {
 390                 ustream_free(&in->_stdout.stream);
 391                 close(in->_stdout.fd.fd);
 392                 in->_stdout.fd.fd = -1;
 393         }
 394
 395         if (in->_stderr.fd.fd > -1) {
 396                 ustream_free(&in->_stderr.stream);
 397                 close(in->_stderr.fd.fd);
 398                 in->_stderr.fd.fd = -1;
 399         }
 400 }
 401
 402 void
 403 instance_start(struct service_instance *in)
 404 {
 405         int pid;
 406         int opipe[2] = { -1, -1 };
 407         int epipe[2] = { -1, -1 };
 408
 409         if (!avl_is_empty(&in->errors.avl)) {
 410                 LOG("Not starting instance %s::%s, an error was indicated\n", in->srv->name, in->name);
 411                 return;
 412         }
 413
 414         if (!in->command) {
 415                 LOG("Not starting instance %s::%s, command not set\n", in->srv->name, in->name);
 416                 return;
 417         }
 418
 419         if (in->proc.pending) {
 420                 if (in->halt)
 421                         in->restart = true;
 422                 return;
 423         }
 424
 425         instance_free_stdio(in);
 426         if (in->_stdout.fd.fd > -2) {
 427                 if (pipe(opipe)) {
 428                         ULOG_WARN("pipe() failed: %m\n");
 429                         opipe[0] = opipe[1] = -1;
 430                 }
 431         }
 432
 433         if (in->_stderr.fd.fd > -2) {
 434                 if (pipe(epipe)) {
 435                         ULOG_WARN("pipe() failed: %m\n");
 436                         epipe[0] = epipe[1] = -1;
 437                 }
 438         }
 439
 440         in->restart = false;
 441         in->halt = false;
 442
 443         if (!in->valid)
 444                 return;
 445
 446         pid = fork();
 447         if (pid < 0)
 448                 return;
 449
 450         if (!pid) {
 451                 uloop_done();
 452                 closefd(opipe[0]);
 453                 closefd(epipe[0]);
 454                 instance_run(in, opipe[1], epipe[1]);
 455                 return;
 456         }
 457
 458         DEBUG(2, "Started instance %s::%s[%d]\n", in->srv->name, in->name, pid);
 459         in->proc.pid = pid;
 460         instance_writepid(in);
 461         clock_gettime(CLOCK_MONOTONIC, &in->start);
 462         uloop_process_add(&in->proc);
 463
 464         if (opipe[0] > -1) {
 465                 ustream_fd_init(&in->_stdout, opipe[0]);
 466                 closefd(opipe[1]);
 467                 fcntl(opipe[0], F_SETFD, FD_CLOEXEC);
 468         }
 469
 470         if (epipe[0] > -1) {
 471                 ustream_fd_init(&in->_stderr, epipe[0]);
 472                 closefd(epipe[1]);
 473                 fcntl(epipe[0], F_SETFD, FD_CLOEXEC);
 474         }
 475
 476         service_event("instance.start", in->srv->name, in->name);
 477 }
 478
 479 static void
 480 instance_stdio(struct ustream *s, int prio, struct service_instance *in)
 481 {
 482         char *newline, *str, *arg0, ident[32];
 483         int len;
 484
 485         arg0 = basename(blobmsg_data(blobmsg_data(in->command)));
 486         snprintf(ident, sizeof(ident), "%s[%d]", arg0, in->proc.pid);
 487         ulog_open(ULOG_SYSLOG, in->syslog_facility, ident);
 488
 489         do {
 490                 str = ustream_get_read_buf(s, &len);
 491                 if (!str)
 492                         break;
 493
 494                 newline = memchr(str, '\n', len);
 495                 if (!newline && (s->r.buffer_len != len))
 496                         break;
 497
 498                 if (newline) {
 499                         *newline = 0;
 500                         len = newline + 1 - str;
 501                 }
 502                 ulog(prio, "%s\n", str);
 503
 504                 ustream_consume(s, len);
 505         } while (1);
 506
 507         ulog_open(ULOG_SYSLOG, LOG_DAEMON, "procd");
 508 }
 509
 510 static void
 511 instance_stdout(struct ustream *s, int bytes)
 512 {
 513         instance_stdio(s, LOG_INFO,
 514                        container_of(s, struct service_instance, _stdout.stream));
 515 }
 516
 517 static void
 518 instance_stderr(struct ustream *s, int bytes)
 519 {
 520         instance_stdio(s, LOG_ERR,
 521                        container_of(s, struct service_instance, _stderr.stream));
 522 }
 523
 524 static void
 525 instance_timeout(struct uloop_timeout *t)
 526 {
 527         struct service_instance *in;
 528
 529         in = container_of(t, struct service_instance, timeout);
 530
 531         if (in->halt) {
 532                 LOG("Instance %s::%s pid %d not stopped on SIGTERM, sending SIGKILL instead\n",
 533                                 in->srv->name, in->name, in->proc.pid);
 534                 kill(in->proc.pid, SIGKILL);
 535         } else if (in->restart || in->respawn)
 536                 instance_start(in);
 537 }
 538
 539 static void
 540 instance_delete(struct service_instance *in)
 541 {
 542         struct service *s = in->srv;
 543
 544         avl_delete(&s->instances.avl, &in->node.avl);
 545         instance_free(in);
 546         service_stopped(s);
 547 }
 548
 549 static void
 550 instance_exit(struct uloop_process *p, int ret)
 551 {
 552         struct service_instance *in;
 553         struct timespec tp;
 554         long runtime;
 555
 556         in = container_of(p, struct service_instance, proc);
 557
 558         clock_gettime(CLOCK_MONOTONIC, &tp);
 559         runtime = tp.tv_sec - in->start.tv_sec;
 560
 561         DEBUG(2, "Instance %s::%s exit with error code %d after %ld seconds\n", in->srv->name, in->name, ret, runtime);
 562
 563         uloop_timeout_cancel(&in->timeout);
 564         service_event("instance.stop", in->srv->name, in->name);
 565
 566         if (in->halt) {
 567                 instance_removepid(in);
 568                 if (in->restart)
 569                         instance_start(in);
 570                 else
 571                         instance_delete(in);
 572         } else if (in->restart) {
 573                 instance_start(in);
 574         } else if (in->respawn) {
 575                 if (runtime < in->respawn_threshold)
 576                         in->respawn_count++;
 577                 else
 578                         in->respawn_count = 0;
 579                 if (in->respawn_count > in->respawn_retry && in->respawn_retry > 0 ) {
 580                         LOG("Instance %s::%s s in a crash loop %d crashes, %ld seconds since last crash\n",
 581                                                                 in->srv->name, in->name, in->respawn_count, runtime);
 582                         in->restart = in->respawn = 0;
 583                         in->halt = 1;
 584                         service_event("instance.fail", in->srv->name, in->name);
 585                 } else {
 586                         service_event("instance.respawn", in->srv->name, in->name);
 587                         uloop_timeout_set(&in->timeout, in->respawn_timeout * 1000);
 588                 }
 589         }
 590 }
 591
 592 void
 593 instance_stop(struct service_instance *in, bool halt)
 594 {
 595         if (!in->proc.pending) {
 596                 if (halt)
 597                         instance_delete(in);
 598                 return;
 599         }
 600         in->halt = halt;
 601         in->restart = in->respawn = false;
 602         kill(in->proc.pid, SIGTERM);
 603         uloop_timeout_set(&in->timeout, in->term_timeout * 1000);
 604 }
 605
 606 static void
 607 instance_restart(struct service_instance *in)
 608 {
 609         if (!in->proc.pending)
 610                 return;
 611
 612         if (in->reload_signal) {
 613                 kill(in->proc.pid, in->reload_signal);
 614                 return;
 615         }
 616
 617         in->halt = true;
 618         in->restart = true;
 619         kill(in->proc.pid, SIGTERM);
 620         uloop_timeout_set(&in->timeout, in->term_timeout * 1000);
 621 }
 622
 623 static bool string_changed(const char *a, const char *b)
 624 {
 625         return !((!a && !b) || (a && b && !strcmp(a, b)));
 626 }
 627
 628 static bool
 629 instance_config_changed(struct service_instance *in, struct service_instance *in_new)
 630 {
 631         if (!in->valid)
 632                 return true;
 633
 634         if (!blob_attr_equal(in->command, in_new->command))
 635                 return true;
 636
 637         if (!blobmsg_list_equal(&in->env, &in_new->env))
 638                 return true;
 639
 640         if (!blobmsg_list_equal(&in->netdev, &in_new->netdev))
 641                 return true;
 642
 643         if (!blobmsg_list_equal(&in->file, &in_new->file))
 644                 return true;
 645
 646         if (in->nice != in_new->nice)
 647                 return true;
 648
 649         if (in->syslog_facility != in_new->syslog_facility)
 650                 return true;
 651
 652         if (string_changed(in->user, in_new->user))
 653                 return true;
 654
 655         if (string_changed(in->group, in_new->group))
 656                 return true;
 657
 658         if (in->uid != in_new->uid)
 659                 return true;
 660
 661         if (in->pw_gid != in_new->pw_gid)
 662                 return true;
 663
 664         if (string_changed(in->pidfile, in_new->pidfile))
 665                 return true;
 666
 667         if (in->respawn_retry != in_new->respawn_retry)
 668                 return true;
 669         if (in->respawn_threshold != in_new->respawn_threshold)
 670                 return true;
 671         if (in->respawn_timeout != in_new->respawn_timeout)
 672                 return true;
 673
 674         if ((!in->seccomp && in_new->seccomp) ||
 675             (in->seccomp && !in_new->seccomp) ||
 676             (in->seccomp && in_new->seccomp && strcmp(in->seccomp, in_new->seccomp)))
 677                 return true;
 678
 679         if (!blobmsg_list_equal(&in->limits, &in_new->limits))
 680                 return true;
 681
 682         if (!blobmsg_list_equal(&in->jail.mount, &in_new->jail.mount))
 683                 return true;
 684
 685         if (!blobmsg_list_equal(&in->errors, &in_new->errors))
 686                 return true;
 687
 688         return false;
 689 }
 690
 691 static bool
 692 instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 693 {
 694         struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
 695         struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
 696
 697         return n1->ifindex == n2->ifindex;
 698 }
 699
 700 static void
 701 instance_netdev_update(struct blobmsg_list_node *l)
 702 {
 703         struct instance_netdev *n = container_of(l, struct instance_netdev, node);
 704
 705         n->ifindex = if_nametoindex(n->node.avl.key);
 706 }
 707
 708 static bool
 709 instance_file_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 710 {
 711         struct instance_file *f1 = container_of(l1, struct instance_file, node);
 712         struct instance_file *f2 = container_of(l2, struct instance_file, node);
 713
 714         return !memcmp(f1->md5, f2->md5, sizeof(f1->md5));
 715 }
 716
 717 static void
 718 instance_file_update(struct blobmsg_list_node *l)
 719 {
 720         struct instance_file *f = container_of(l, struct instance_file, node);
 721         md5_ctx_t md5;
 722         char buf[256];
 723         int len, fd;
 724
 725         memset(f->md5, 0, sizeof(f->md5));
 726
 727         fd = open(l->avl.key, O_RDONLY);
 728         if (fd < 0)
 729                 return;
 730
 731         md5_begin(&md5);
 732         do {
 733                 len = read(fd, buf, sizeof(buf));
 734                 if (len < 0) {
 735                         if (errno == EINTR)
 736                                 continue;
 737
 738                         break;
 739                 }
 740                 if (!len)
 741                         break;
 742
 743                 md5_hash(buf, len, &md5);
 744         } while(1);
 745
 746         md5_end(f->md5, &md5);
 747         close(fd);
 748 }
 749
 750 static void
 751 instance_fill_any(struct blobmsg_list *l, struct blob_attr *cur)
 752 {
 753         if (!cur)
 754                 return;
 755
 756         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), false);
 757 }
 758
 759 static bool
 760 instance_fill_array(struct blobmsg_list *l, struct blob_attr *cur, blobmsg_update_cb cb, bool array)
 761 {
 762         struct blobmsg_list_node *node;
 763
 764         if (!cur)
 765                 return true;
 766
 767         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 768                 return false;
 769
 770         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), array);
 771         if (cb) {
 772                 blobmsg_list_for_each(l, node)
 773                         cb(node);
 774         }
 775         return true;
 776 }
 777
 778 static int
 779 instance_jail_parse(struct service_instance *in, struct blob_attr *attr)
 780 {
 781         struct blob_attr *tb[__JAIL_ATTR_MAX];
 782         struct jail *jail = &in->jail;
 783         struct stat s;
 784
 785         if (stat("/sbin/ujail", &s))
 786                 return 0;
 787
 788         blobmsg_parse(jail_attr, __JAIL_ATTR_MAX, tb,
 789                 blobmsg_data(attr), blobmsg_data_len(attr));
 790
 791         jail->argc = 2;
 792
 793         if (tb[JAIL_ATTR_NAME]) {
 794                 jail->name = blobmsg_get_string(tb[JAIL_ATTR_NAME]);
 795                 jail->argc += 2;
 796         }
 797         if (tb[JAIL_ATTR_HOSTNAME]) {
 798                 jail->hostname = blobmsg_get_string(tb[JAIL_ATTR_HOSTNAME]);
 799                 jail->argc += 2;
 800         }
 801         if (tb[JAIL_ATTR_PROCFS]) {
 802                 jail->procfs = blobmsg_get_bool(tb[JAIL_ATTR_PROCFS]);
 803                 jail->argc++;
 804         }
 805         if (tb[JAIL_ATTR_SYSFS]) {
 806                 jail->sysfs = blobmsg_get_bool(tb[JAIL_ATTR_SYSFS]);
 807                 jail->argc++;
 808         }
 809         if (tb[JAIL_ATTR_UBUS]) {
 810                 jail->ubus = blobmsg_get_bool(tb[JAIL_ATTR_UBUS]);
 811                 jail->argc++;
 812         }
 813         if (tb[JAIL_ATTR_LOG]) {
 814                 jail->log = blobmsg_get_bool(tb[JAIL_ATTR_LOG]);
 815                 jail->argc++;
 816         }
 817         if (tb[JAIL_ATTR_RONLY]) {
 818                 jail->ronly = blobmsg_get_bool(tb[JAIL_ATTR_RONLY]);
 819                 jail->argc++;
 820         }
 821         if (tb[JAIL_ATTR_MOUNT]) {
 822                 struct blob_attr *cur;
 823                 int rem;
 824
 825                 blobmsg_for_each_attr(cur, tb[JAIL_ATTR_MOUNT], rem)
 826                         jail->argc += 2;
 827                 instance_fill_array(&jail->mount, tb[JAIL_ATTR_MOUNT], NULL, false);
 828         }
 829         if (in->seccomp)
 830                 jail->argc += 2;
 831
 832         return 1;
 833 }
 834
 835 static bool
 836 instance_config_parse_command(struct service_instance *in, struct blob_attr **tb)
 837 {
 838         struct blob_attr *cur, *cur2;
 839         bool ret = false;
 840         int rem;
 841
 842         cur = tb[INSTANCE_ATTR_COMMAND];
 843         if (!cur) {
 844                 in->command = NULL;
 845                 return true;
 846         }
 847
 848         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 849                 return false;
 850
 851         blobmsg_for_each_attr(cur2, cur, rem) {
 852                 ret = true;
 853                 break;
 854         }
 855
 856         in->command = cur;
 857         return ret;
 858 }
 859
 860 static bool
 861 instance_config_parse(struct service_instance *in)
 862 {
 863         struct blob_attr *tb[__INSTANCE_ATTR_MAX];
 864         struct blob_attr *cur, *cur2;
 865         int rem;
 866
 867         blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
 868                 blobmsg_data(in->config), blobmsg_data_len(in->config));
 869
 870         if (!instance_config_parse_command(in, tb))
 871                 return false;
 872
 873         if (tb[INSTANCE_ATTR_TERMTIMEOUT])
 874                 in->term_timeout = blobmsg_get_u32(tb[INSTANCE_ATTR_TERMTIMEOUT]);
 875         if (tb[INSTANCE_ATTR_RESPAWN]) {
 876                 int i = 0;
 877                 uint32_t vals[3] = { 3600, 5, 5};
 878
 879                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_RESPAWN], rem) {
 880                         if ((i >= 3) && (blobmsg_type(cur2) == BLOBMSG_TYPE_STRING))
 881                                 continue;
 882                         vals[i] = atoi(blobmsg_get_string(cur2));
 883                         i++;
 884                 }
 885                 in->respawn = true;
 886                 in->respawn_count = 0;
 887                 in->respawn_threshold = vals[0];
 888                 in->respawn_timeout = vals[1];
 889                 in->respawn_retry = vals[2];
 890         }
 891         if (tb[INSTANCE_ATTR_TRIGGER]) {
 892                 in->trigger = tb[INSTANCE_ATTR_TRIGGER];
 893                 trigger_add(in->trigger, in);
 894         }
 895
 896         if (tb[INSTANCE_ATTR_WATCH]) {
 897                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_WATCH], rem) {
 898                         if (blobmsg_type(cur2) != BLOBMSG_TYPE_STRING)
 899                                 continue;
 900                         DEBUG(3, "watch for %s\n", blobmsg_get_string(cur2));
 901                         watch_add(blobmsg_get_string(cur2), in);
 902                 }
 903         }
 904
 905         if ((cur = tb[INSTANCE_ATTR_NICE])) {
 906                 in->nice = (int8_t) blobmsg_get_u32(cur);
 907                 if (in->nice < -20 || in->nice > 20)
 908                         return false;
 909         }
 910
 911         if (tb[INSTANCE_ATTR_USER]) {
 912                 const char *user = blobmsg_get_string(tb[INSTANCE_ATTR_USER]);
 913                 struct passwd *p = getpwnam(user);
 914                 if (p) {
 915                         in->user = strdup(user);
 916                         in->uid = p->pw_uid;
 917                         in->gr_gid = in->pw_gid = p->pw_gid;
 918                 }
 919         }
 920
 921         if (tb[INSTANCE_ATTR_GROUP]) {
 922                 const char *group = blobmsg_get_string(tb[INSTANCE_ATTR_GROUP]);
 923                 struct group *p = getgrnam(group);
 924                 if (p) {
 925                         in->group = strdup(group);
 926                         in->gr_gid = p->gr_gid;
 927                 }
 928         }
 929
 930         if (tb[INSTANCE_ATTR_TRACE])
 931                 in->trace = blobmsg_get_bool(tb[INSTANCE_ATTR_TRACE]);
 932
 933         if (tb[INSTANCE_ATTR_NO_NEW_PRIVS])
 934                 in->no_new_privs = blobmsg_get_bool(tb[INSTANCE_ATTR_NO_NEW_PRIVS]);
 935
 936         if (!in->trace && tb[INSTANCE_ATTR_SECCOMP])
 937                 in->seccomp = blobmsg_get_string(tb[INSTANCE_ATTR_SECCOMP]);
 938
 939         if (tb[INSTANCE_ATTR_PIDFILE]) {
 940                 char *pidfile = blobmsg_get_string(tb[INSTANCE_ATTR_PIDFILE]);
 941                 if (pidfile)
 942                         in->pidfile = pidfile;
 943         }
 944
 945         if (tb[INSTANCE_ATTR_RELOADSIG])
 946                 in->reload_signal = blobmsg_get_u32(tb[INSTANCE_ATTR_RELOADSIG]);
 947
 948         if (!in->trace && tb[INSTANCE_ATTR_JAIL])
 949                 in->has_jail = instance_jail_parse(in, tb[INSTANCE_ATTR_JAIL]);
 950
 951         if (tb[INSTANCE_ATTR_STDOUT] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDOUT]))
 952                 in->_stdout.fd.fd = -1;
 953
 954         if (tb[INSTANCE_ATTR_STDERR] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDERR]))
 955                 in->_stderr.fd.fd = -1;
 956
 957         instance_fill_any(&in->data, tb[INSTANCE_ATTR_DATA]);
 958
 959         if (!instance_fill_array(&in->env, tb[INSTANCE_ATTR_ENV], NULL, false))
 960                 return false;
 961
 962         if (!instance_fill_array(&in->netdev, tb[INSTANCE_ATTR_NETDEV], instance_netdev_update, true))
 963                 return false;
 964
 965         if (!instance_fill_array(&in->file, tb[INSTANCE_ATTR_FILE], instance_file_update, true))
 966                 return false;
 967
 968         if (!instance_fill_array(&in->limits, tb[INSTANCE_ATTR_LIMITS], NULL, false))
 969                 return false;
 970
 971         if (!instance_fill_array(&in->errors, tb[INSTANCE_ATTR_ERROR], NULL, true))
 972                 return false;
 973
 974         if (tb[INSTANCE_ATTR_FACILITY]) {
 975                 int facility = syslog_facility_str_to_int(blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
 976                 if (facility != -1) {
 977                         in->syslog_facility = facility;
 978                         DEBUG(3, "setting facility '%s'\n", blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
 979                 } else
 980                         DEBUG(3, "unknown syslog facility '%s' given, using default (LOG_DAEMON)\n", blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
 981         }
 982
 983         return true;
 984 }
 985
 986 static void
 987 instance_config_cleanup(struct service_instance *in)
 988 {
 989         blobmsg_list_free(&in->env);
 990         blobmsg_list_free(&in->data);
 991         blobmsg_list_free(&in->netdev);
 992         blobmsg_list_free(&in->file);
 993         blobmsg_list_free(&in->limits);
 994         blobmsg_list_free(&in->errors);
 995         blobmsg_list_free(&in->jail.mount);
 996 }
 997
 998 static void
 999 instance_config_move(struct service_instance *in, struct service_instance *in_src)
1000 {
1001         instance_config_cleanup(in);
1002         blobmsg_list_move(&in->env, &in_src->env);
1003         blobmsg_list_move(&in->data, &in_src->data);
1004         blobmsg_list_move(&in->netdev, &in_src->netdev);
1005         blobmsg_list_move(&in->file, &in_src->file);
1006         blobmsg_list_move(&in->limits, &in_src->limits);
1007         blobmsg_list_move(&in->errors, &in_src->errors);
1008         blobmsg_list_move(&in->jail.mount, &in_src->jail.mount);
1009         in->trigger = in_src->trigger;
1010         in->command = in_src->command;
1011         in->pidfile = in_src->pidfile;
1012         in->respawn = in_src->respawn;
1013         in->respawn_retry = in_src->respawn_retry;
1014         in->respawn_threshold = in_src->respawn_threshold;
1015         in->respawn_timeout = in_src->respawn_timeout;
1016         in->name = in_src->name;
1017         in->trace = in_src->trace;
1018         in->seccomp = in_src->seccomp;
1019         in->node.avl.key = in_src->node.avl.key;
1020         in->syslog_facility = in_src->syslog_facility;
1021
1022         free(in->config);
1023         in->config = in_src->config;
1024         in_src->config = NULL;
1025 }
1026
1027 void
1028 instance_update(struct service_instance *in, struct service_instance *in_new)
1029 {
1030         bool changed = instance_config_changed(in, in_new);
1031         bool running = in->proc.pending;
1032         bool stopping = in->halt;
1033
1034         if (!running || stopping) {
1035                 instance_config_move(in, in_new);
1036                 instance_start(in);
1037         } else {
1038                 if (changed)
1039                         instance_restart(in);
1040                 instance_config_move(in, in_new);
1041                 /* restart happens in the child callback handler */
1042         }
1043 }
1044
1045 void
1046 instance_free(struct service_instance *in)
1047 {
1048         instance_free_stdio(in);
1049         uloop_process_delete(&in->proc);
1050         uloop_timeout_cancel(&in->timeout);
1051         trigger_del(in);
1052         watch_del(in);
1053         instance_config_cleanup(in);
1054         free(in->config);
1055         free(in->user);
1056         free(in->group);
1057         free(in);
1058 }
1059
1060 void
1061 instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
1062 {
1063         config = blob_memdup(config);
1064         in->srv = s;
1065         in->name = blobmsg_name(config);
1066         in->config = config;
1067         in->timeout.cb = instance_timeout;
1068         in->proc.cb = instance_exit;
1069         in->term_timeout = 5;
1070         in->syslog_facility = LOG_DAEMON;
1071
1072         in->_stdout.fd.fd = -2;
1073         in->_stdout.stream.string_data = true;
1074         in->_stdout.stream.notify_read = instance_stdout;
1075
1076         in->_stderr.fd.fd = -2;
1077         in->_stderr.stream.string_data = true;
1078         in->_stderr.stream.notify_read = instance_stderr;
1079
1080         blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
1081         blobmsg_list_init(&in->file, struct instance_file, node, instance_file_cmp);
1082         blobmsg_list_simple_init(&in->env);
1083         blobmsg_list_simple_init(&in->data);
1084         blobmsg_list_simple_init(&in->limits);
1085         blobmsg_list_simple_init(&in->errors);
1086         blobmsg_list_simple_init(&in->jail.mount);
1087         in->valid = instance_config_parse(in);
1088 }
1089
1090 void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
1091 {
1092         void *i;
1093
1094         if (!in->valid)
1095                 return;
1096
1097         i = blobmsg_open_table(b, in->name);
1098         blobmsg_add_u8(b, "running", in->proc.pending);
1099         if (in->proc.pending)
1100                 blobmsg_add_u32(b, "pid", in->proc.pid);
1101         if (in->command)
1102                 blobmsg_add_blob(b, in->command);
1103         blobmsg_add_u32(b, "term_timeout", in->term_timeout);
1104
1105         if (!avl_is_empty(&in->errors.avl)) {
1106                 struct blobmsg_list_node *var;
1107                 void *e = blobmsg_open_array(b, "errors");
1108                 blobmsg_list_for_each(&in->errors, var)
1109                         blobmsg_add_string(b, NULL, blobmsg_data(var->data));
1110                 blobmsg_close_table(b, e);
1111         }
1112
1113         if (!avl_is_empty(&in->env.avl)) {
1114                 struct blobmsg_list_node *var;
1115                 void *e = blobmsg_open_table(b, "env");
1116                 blobmsg_list_for_each(&in->env, var)
1117                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1118                 blobmsg_close_table(b, e);
1119         }
1120
1121         if (!avl_is_empty(&in->data.avl)) {
1122                 struct blobmsg_list_node *var;
1123                 void *e = blobmsg_open_table(b, "data");
1124                 blobmsg_list_for_each(&in->data, var)
1125                         blobmsg_add_blob(b, var->data);
1126                 blobmsg_close_table(b, e);
1127         }
1128
1129         if (!avl_is_empty(&in->limits.avl)) {
1130                 struct blobmsg_list_node *var;
1131                 void *e = blobmsg_open_table(b, "limits");
1132                 blobmsg_list_for_each(&in->limits, var)
1133                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1134                 blobmsg_close_table(b, e);
1135         }
1136
1137         if (in->reload_signal)
1138                 blobmsg_add_u32(b, "reload_signal", in->reload_signal);
1139
1140         if (in->respawn) {
1141                 void *r = blobmsg_open_table(b, "respawn");
1142                 blobmsg_add_u32(b, "threshold", in->respawn_threshold);
1143                 blobmsg_add_u32(b, "timeout", in->respawn_timeout);
1144                 blobmsg_add_u32(b, "retry", in->respawn_retry);
1145                 blobmsg_close_table(b, r);
1146         }
1147
1148         if (in->trace)
1149                 blobmsg_add_u8(b, "trace", true);
1150
1151         if (in->no_new_privs)
1152                 blobmsg_add_u8(b, "no_new_privs", true);
1153
1154         if (in->seccomp)
1155                 blobmsg_add_string(b, "seccomp", in->seccomp);
1156
1157         if (in->pidfile)
1158                 blobmsg_add_string(b, "pidfile", in->pidfile);
1159
1160         if (in->user)
1161                 blobmsg_add_string(b, "user", in->user);
1162
1163         if (in->group)
1164                 blobmsg_add_string(b, "group", in->group);
1165
1166         if (in->has_jail) {
1167                 void *r = blobmsg_open_table(b, "jail");
1168                 if (in->jail.name)
1169                         blobmsg_add_string(b, "name", in->jail.name);
1170                 if (in->jail.hostname)
1171                         blobmsg_add_string(b, "hostname", in->jail.hostname);
1172                 blobmsg_add_u8(b, "procfs", in->jail.procfs);
1173                 blobmsg_add_u8(b, "sysfs", in->jail.sysfs);
1174                 blobmsg_add_u8(b, "ubus", in->jail.ubus);
1175                 blobmsg_add_u8(b, "log", in->jail.log);
1176                 blobmsg_add_u8(b, "ronly", in->jail.ronly);
1177                 blobmsg_close_table(b, r);
1178                 if (!avl_is_empty(&in->jail.mount.avl)) {
1179                         struct blobmsg_list_node *var;
1180                         void *e = blobmsg_open_table(b, "mount");
1181                         blobmsg_list_for_each(&in->jail.mount, var)
1182                                 blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1183                         blobmsg_close_table(b, e);
1184                 }
1185         }
1186
1187         if (verbose && in->trigger)
1188                 blobmsg_add_blob(b, in->trigger);
1189
1190         blobmsg_close_table(b, i);
1191 }