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->user) {
 226                 argv[argc++] = "-U";
 227                 argv[argc++] = in->user;
 228         }
 229
 230         if (in->group) {
 231                 argv[argc++] = "-G";
 232                 argv[argc++] = in->group;
 233         }
 234
 235         if (in->no_new_privs)
 236                 argv[argc++] = "-c";
 237
 238         if (jail->procfs)
 239                 argv[argc++] = "-p";
 240
 241         if (jail->sysfs)
 242                 argv[argc++] = "-s";
 243
 244         if (jail->ubus)
 245                 argv[argc++] = "-u";
 246
 247         if (jail->log)
 248                 argv[argc++] = "-l";
 249
 250         if (jail->ronly)
 251                 argv[argc++] = "-o";
 252
 253         blobmsg_list_for_each(&jail->mount, var) {
 254                 const char *type = blobmsg_data(var->data);
 255
 256                 if (*type == '1')
 257                         argv[argc++] = "-w";
 258                 else
 259                         argv[argc++] = "-r";
 260                 argv[argc++] = (char *) blobmsg_name(var->data);
 261         }
 262
 263         argv[argc++] = "--";
 264
 265         return argc;
 266 }
 267
 268 static int
 269 instance_removepid(struct service_instance *in) {
 270         if (!in->pidfile)
 271                 return 0;
 272         if (unlink(in->pidfile)) {
 273                 ERROR("Failed to remove pidfile: %s: %m\n", in->pidfile);
 274                 return 1;
 275         }
 276         return 0;
 277 }
 278
 279 static int
 280 instance_writepid(struct service_instance *in)
 281 {
 282         FILE *_pidfile;
 283
 284         if (!in->pidfile) {
 285                 return 0;
 286         }
 287         _pidfile = fopen(in->pidfile, "w");
 288         if (_pidfile == NULL) {
 289                 ERROR("failed to open pidfile for writing: %s: %m", in->pidfile);
 290                 return 1;
 291         }
 292         if (fprintf(_pidfile, "%d\n", in->proc.pid) < 0) {
 293                 ERROR("failed to write pidfile: %s: %m", in->pidfile);
 294                 fclose(_pidfile);
 295                 return 2;
 296         }
 297         if (fclose(_pidfile)) {
 298                 ERROR("failed to close pidfile: %s: %m", in->pidfile);
 299                 return 3;
 300         }
 301
 302         return 0;
 303 }
 304
 305 static void
 306 instance_run(struct service_instance *in, int _stdout, int _stderr)
 307 {
 308         struct blobmsg_list_node *var;
 309         struct blob_attr *cur;
 310         char **argv;
 311         int argc = 1; /* NULL terminated */
 312         int rem, _stdin;
 313         bool seccomp = !in->trace && !in->has_jail && in->seccomp;
 314         bool setlbf = _stdout >= 0;
 315
 316         if (in->nice)
 317                 setpriority(PRIO_PROCESS, 0, in->nice);
 318
 319         blobmsg_for_each_attr(cur, in->command, rem)
 320                 argc++;
 321
 322         blobmsg_list_for_each(&in->env, var)
 323                 setenv(blobmsg_name(var->data), blobmsg_data(var->data), 1);
 324
 325         if (seccomp)
 326                 setenv("SECCOMP_FILE", in->seccomp, 1);
 327
 328         if (setlbf)
 329                 setenv("LD_PRELOAD", "/lib/libsetlbf.so", 1);
 330
 331         blobmsg_list_for_each(&in->limits, var)
 332                 instance_limits(blobmsg_name(var->data), blobmsg_data(var->data));
 333
 334         if (in->trace || seccomp)
 335                 argc += 1;
 336
 337         argv = alloca(sizeof(char *) * (argc + in->jail.argc));
 338         argc = 0;
 339
 340 #ifdef SECCOMP_SUPPORT
 341         if (in->trace)
 342                 argv[argc++] = "/sbin/utrace";
 343         else if (seccomp)
 344                 argv[argc++] = "/sbin/seccomp-trace";
 345 #else
 346         if (in->trace || seccomp)
 347                 ULOG_WARN("Seccomp support for %s::%s not available\n", in->srv->name, in->name);
 348 #endif
 349
 350         if (in->has_jail) {
 351                 argc = jail_run(in, argv);
 352                 if (argc != in->jail.argc)
 353                         ULOG_WARN("expected %i jail params, used %i for %s::%s\n",
 354                                 in->jail.argc, argc, in->srv->name, in->name);
 355         }
 356
 357         blobmsg_for_each_attr(cur, in->command, rem)
 358                 argv[argc++] = blobmsg_data(cur);
 359
 360         argv[argc] = NULL;
 361
 362         _stdin = open("/dev/null", O_RDONLY);
 363
 364         if (_stdout == -1)
 365                 _stdout = open("/dev/null", O_WRONLY);
 366
 367         if (_stderr == -1)
 368                 _stderr = open("/dev/null", O_WRONLY);
 369
 370         if (_stdin > -1) {
 371                 dup2(_stdin, STDIN_FILENO);
 372                 closefd(_stdin);
 373         }
 374         if (_stdout > -1) {
 375                 dup2(_stdout, STDOUT_FILENO);
 376                 closefd(_stdout);
 377         }
 378         if (_stderr > -1) {
 379                 dup2(_stderr, STDERR_FILENO);
 380                 closefd(_stderr);
 381         }
 382
 383         if (!in->has_jail && in->user && in->pw_gid && initgroups(in->user, in->pw_gid)) {
 384                 ERROR("failed to initgroups() for user %s: %m\n", in->user);
 385                 exit(127);
 386         }
 387         if (!in->has_jail && in->gr_gid && setgid(in->gr_gid)) {
 388                 ERROR("failed to set group id %d: %m\n", in->gr_gid);
 389                 exit(127);
 390         }
 391         if (!in->has_jail && in->uid && setuid(in->uid)) {
 392                 ERROR("failed to set user id %d: %m\n", in->uid);
 393                 exit(127);
 394         }
 395
 396         execvp(argv[0], argv);
 397         exit(127);
 398 }
 399
 400 static void
 401 instance_free_stdio(struct service_instance *in)
 402 {
 403         if (in->_stdout.fd.fd > -1) {
 404                 ustream_free(&in->_stdout.stream);
 405                 close(in->_stdout.fd.fd);
 406                 in->_stdout.fd.fd = -1;
 407         }
 408
 409         if (in->_stderr.fd.fd > -1) {
 410                 ustream_free(&in->_stderr.stream);
 411                 close(in->_stderr.fd.fd);
 412                 in->_stderr.fd.fd = -1;
 413         }
 414 }
 415
 416 void
 417 instance_start(struct service_instance *in)
 418 {
 419         int pid;
 420         int opipe[2] = { -1, -1 };
 421         int epipe[2] = { -1, -1 };
 422
 423         if (!avl_is_empty(&in->errors.avl)) {
 424                 LOG("Not starting instance %s::%s, an error was indicated\n", in->srv->name, in->name);
 425                 return;
 426         }
 427
 428         if (!in->command) {
 429                 LOG("Not starting instance %s::%s, command not set\n", in->srv->name, in->name);
 430                 return;
 431         }
 432
 433         if (in->proc.pending) {
 434                 if (in->halt)
 435                         in->restart = true;
 436                 return;
 437         }
 438
 439         instance_free_stdio(in);
 440         if (in->_stdout.fd.fd > -2) {
 441                 if (pipe(opipe)) {
 442                         ULOG_WARN("pipe() failed: %m\n");
 443                         opipe[0] = opipe[1] = -1;
 444                 }
 445         }
 446
 447         if (in->_stderr.fd.fd > -2) {
 448                 if (pipe(epipe)) {
 449                         ULOG_WARN("pipe() failed: %m\n");
 450                         epipe[0] = epipe[1] = -1;
 451                 }
 452         }
 453
 454         in->restart = false;
 455         in->halt = false;
 456
 457         if (!in->valid)
 458                 return;
 459
 460         pid = fork();
 461         if (pid < 0)
 462                 return;
 463
 464         if (!pid) {
 465                 uloop_done();
 466                 closefd(opipe[0]);
 467                 closefd(epipe[0]);
 468                 instance_run(in, opipe[1], epipe[1]);
 469                 return;
 470         }
 471
 472         DEBUG(2, "Started instance %s::%s[%d]\n", in->srv->name, in->name, pid);
 473         in->proc.pid = pid;
 474         instance_writepid(in);
 475         clock_gettime(CLOCK_MONOTONIC, &in->start);
 476         uloop_process_add(&in->proc);
 477
 478         if (opipe[0] > -1) {
 479                 ustream_fd_init(&in->_stdout, opipe[0]);
 480                 closefd(opipe[1]);
 481                 fcntl(opipe[0], F_SETFD, FD_CLOEXEC);
 482         }
 483
 484         if (epipe[0] > -1) {
 485                 ustream_fd_init(&in->_stderr, epipe[0]);
 486                 closefd(epipe[1]);
 487                 fcntl(epipe[0], F_SETFD, FD_CLOEXEC);
 488         }
 489
 490         service_event("instance.start", in->srv->name, in->name);
 491 }
 492
 493 static void
 494 instance_stdio(struct ustream *s, int prio, struct service_instance *in)
 495 {
 496         char *newline, *str, *arg0, ident[32];
 497         int len;
 498
 499         arg0 = basename(blobmsg_data(blobmsg_data(in->command)));
 500         snprintf(ident, sizeof(ident), "%s[%d]", arg0, in->proc.pid);
 501         ulog_open(ULOG_SYSLOG, in->syslog_facility, ident);
 502
 503         do {
 504                 str = ustream_get_read_buf(s, &len);
 505                 if (!str)
 506                         break;
 507
 508                 newline = memchr(str, '\n', len);
 509                 if (!newline && (s->r.buffer_len != len))
 510                         break;
 511
 512                 if (newline) {
 513                         *newline = 0;
 514                         len = newline + 1 - str;
 515                 }
 516                 ulog(prio, "%s\n", str);
 517
 518                 ustream_consume(s, len);
 519         } while (1);
 520
 521         ulog_open(ULOG_SYSLOG, LOG_DAEMON, "procd");
 522 }
 523
 524 static void
 525 instance_stdout(struct ustream *s, int bytes)
 526 {
 527         instance_stdio(s, LOG_INFO,
 528                        container_of(s, struct service_instance, _stdout.stream));
 529 }
 530
 531 static void
 532 instance_stderr(struct ustream *s, int bytes)
 533 {
 534         instance_stdio(s, LOG_ERR,
 535                        container_of(s, struct service_instance, _stderr.stream));
 536 }
 537
 538 static void
 539 instance_timeout(struct uloop_timeout *t)
 540 {
 541         struct service_instance *in;
 542
 543         in = container_of(t, struct service_instance, timeout);
 544
 545         if (in->halt) {
 546                 LOG("Instance %s::%s pid %d not stopped on SIGTERM, sending SIGKILL instead\n",
 547                                 in->srv->name, in->name, in->proc.pid);
 548                 kill(in->proc.pid, SIGKILL);
 549         } else if (in->restart || in->respawn)
 550                 instance_start(in);
 551 }
 552
 553 static void
 554 instance_delete(struct service_instance *in)
 555 {
 556         struct service *s = in->srv;
 557
 558         avl_delete(&s->instances.avl, &in->node.avl);
 559         instance_free(in);
 560         service_stopped(s);
 561 }
 562
 563 static void
 564 instance_exit(struct uloop_process *p, int ret)
 565 {
 566         struct service_instance *in;
 567         struct timespec tp;
 568         long runtime;
 569
 570         in = container_of(p, struct service_instance, proc);
 571
 572         clock_gettime(CLOCK_MONOTONIC, &tp);
 573         runtime = tp.tv_sec - in->start.tv_sec;
 574
 575         DEBUG(2, "Instance %s::%s exit with error code %d after %ld seconds\n", in->srv->name, in->name, ret, runtime);
 576
 577         uloop_timeout_cancel(&in->timeout);
 578         service_event("instance.stop", in->srv->name, in->name);
 579
 580         if (in->halt) {
 581                 instance_removepid(in);
 582                 if (in->restart)
 583                         instance_start(in);
 584                 else
 585                         instance_delete(in);
 586         } else if (in->restart) {
 587                 instance_start(in);
 588         } else if (in->respawn) {
 589                 if (runtime < in->respawn_threshold)
 590                         in->respawn_count++;
 591                 else
 592                         in->respawn_count = 0;
 593                 if (in->respawn_count > in->respawn_retry && in->respawn_retry > 0 ) {
 594                         LOG("Instance %s::%s s in a crash loop %d crashes, %ld seconds since last crash\n",
 595                                                                 in->srv->name, in->name, in->respawn_count, runtime);
 596                         in->restart = in->respawn = 0;
 597                         in->halt = 1;
 598                         service_event("instance.fail", in->srv->name, in->name);
 599                 } else {
 600                         service_event("instance.respawn", in->srv->name, in->name);
 601                         uloop_timeout_set(&in->timeout, in->respawn_timeout * 1000);
 602                 }
 603         }
 604 }
 605
 606 void
 607 instance_stop(struct service_instance *in, bool halt)
 608 {
 609         if (!in->proc.pending) {
 610                 if (halt)
 611                         instance_delete(in);
 612                 return;
 613         }
 614         in->halt = halt;
 615         in->restart = in->respawn = false;
 616         kill(in->proc.pid, SIGTERM);
 617         uloop_timeout_set(&in->timeout, in->term_timeout * 1000);
 618 }
 619
 620 static void
 621 instance_restart(struct service_instance *in)
 622 {
 623         if (!in->proc.pending)
 624                 return;
 625
 626         if (in->reload_signal) {
 627                 kill(in->proc.pid, in->reload_signal);
 628                 return;
 629         }
 630
 631         in->halt = true;
 632         in->restart = true;
 633         kill(in->proc.pid, SIGTERM);
 634         uloop_timeout_set(&in->timeout, in->term_timeout * 1000);
 635 }
 636
 637 static bool string_changed(const char *a, const char *b)
 638 {
 639         return !((!a && !b) || (a && b && !strcmp(a, b)));
 640 }
 641
 642 static bool
 643 instance_config_changed(struct service_instance *in, struct service_instance *in_new)
 644 {
 645         if (!in->valid)
 646                 return true;
 647
 648         if (!blob_attr_equal(in->command, in_new->command))
 649                 return true;
 650
 651         if (!blobmsg_list_equal(&in->env, &in_new->env))
 652                 return true;
 653
 654         if (!blobmsg_list_equal(&in->netdev, &in_new->netdev))
 655                 return true;
 656
 657         if (!blobmsg_list_equal(&in->file, &in_new->file))
 658                 return true;
 659
 660         if (in->nice != in_new->nice)
 661                 return true;
 662
 663         if (in->syslog_facility != in_new->syslog_facility)
 664                 return true;
 665
 666         if (string_changed(in->user, in_new->user))
 667                 return true;
 668
 669         if (string_changed(in->group, in_new->group))
 670                 return true;
 671
 672         if (in->uid != in_new->uid)
 673                 return true;
 674
 675         if (in->pw_gid != in_new->pw_gid)
 676                 return true;
 677
 678         if (string_changed(in->pidfile, in_new->pidfile))
 679                 return true;
 680
 681         if (in->respawn_retry != in_new->respawn_retry)
 682                 return true;
 683         if (in->respawn_threshold != in_new->respawn_threshold)
 684                 return true;
 685         if (in->respawn_timeout != in_new->respawn_timeout)
 686                 return true;
 687
 688         if ((!in->seccomp && in_new->seccomp) ||
 689             (in->seccomp && !in_new->seccomp) ||
 690             (in->seccomp && in_new->seccomp && strcmp(in->seccomp, in_new->seccomp)))
 691                 return true;
 692
 693         if (!blobmsg_list_equal(&in->limits, &in_new->limits))
 694                 return true;
 695
 696         if (!blobmsg_list_equal(&in->jail.mount, &in_new->jail.mount))
 697                 return true;
 698
 699         if (!blobmsg_list_equal(&in->errors, &in_new->errors))
 700                 return true;
 701
 702         return false;
 703 }
 704
 705 static bool
 706 instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 707 {
 708         struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
 709         struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
 710
 711         return n1->ifindex == n2->ifindex;
 712 }
 713
 714 static void
 715 instance_netdev_update(struct blobmsg_list_node *l)
 716 {
 717         struct instance_netdev *n = container_of(l, struct instance_netdev, node);
 718
 719         n->ifindex = if_nametoindex(n->node.avl.key);
 720 }
 721
 722 static bool
 723 instance_file_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 724 {
 725         struct instance_file *f1 = container_of(l1, struct instance_file, node);
 726         struct instance_file *f2 = container_of(l2, struct instance_file, node);
 727
 728         return !memcmp(f1->md5, f2->md5, sizeof(f1->md5));
 729 }
 730
 731 static void
 732 instance_file_update(struct blobmsg_list_node *l)
 733 {
 734         struct instance_file *f = container_of(l, struct instance_file, node);
 735         md5_ctx_t md5;
 736         char buf[256];
 737         int len, fd;
 738
 739         memset(f->md5, 0, sizeof(f->md5));
 740
 741         fd = open(l->avl.key, O_RDONLY);
 742         if (fd < 0)
 743                 return;
 744
 745         md5_begin(&md5);
 746         do {
 747                 len = read(fd, buf, sizeof(buf));
 748                 if (len < 0) {
 749                         if (errno == EINTR)
 750                                 continue;
 751
 752                         break;
 753                 }
 754                 if (!len)
 755                         break;
 756
 757                 md5_hash(buf, len, &md5);
 758         } while(1);
 759
 760         md5_end(f->md5, &md5);
 761         close(fd);
 762 }
 763
 764 static void
 765 instance_fill_any(struct blobmsg_list *l, struct blob_attr *cur)
 766 {
 767         if (!cur)
 768                 return;
 769
 770         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), false);
 771 }
 772
 773 static bool
 774 instance_fill_array(struct blobmsg_list *l, struct blob_attr *cur, blobmsg_update_cb cb, bool array)
 775 {
 776         struct blobmsg_list_node *node;
 777
 778         if (!cur)
 779                 return true;
 780
 781         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 782                 return false;
 783
 784         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), array);
 785         if (cb) {
 786                 blobmsg_list_for_each(l, node)
 787                         cb(node);
 788         }
 789         return true;
 790 }
 791
 792 static int
 793 instance_jail_parse(struct service_instance *in, struct blob_attr *attr)
 794 {
 795         struct blob_attr *tb[__JAIL_ATTR_MAX];
 796         struct jail *jail = &in->jail;
 797         struct stat s;
 798
 799         if (stat("/sbin/ujail", &s))
 800                 return 0;
 801
 802         blobmsg_parse(jail_attr, __JAIL_ATTR_MAX, tb,
 803                 blobmsg_data(attr), blobmsg_data_len(attr));
 804
 805         jail->argc = 2;
 806
 807         if (tb[JAIL_ATTR_NAME]) {
 808                 jail->name = strdup(blobmsg_get_string(tb[JAIL_ATTR_NAME]));
 809                 jail->argc += 2;
 810         }
 811         if (tb[JAIL_ATTR_HOSTNAME]) {
 812                 jail->hostname = strdup(blobmsg_get_string(tb[JAIL_ATTR_HOSTNAME]));
 813                 jail->argc += 2;
 814         }
 815         if (tb[JAIL_ATTR_PROCFS]) {
 816                 jail->procfs = blobmsg_get_bool(tb[JAIL_ATTR_PROCFS]);
 817                 jail->argc++;
 818         }
 819         if (tb[JAIL_ATTR_SYSFS]) {
 820                 jail->sysfs = blobmsg_get_bool(tb[JAIL_ATTR_SYSFS]);
 821                 jail->argc++;
 822         }
 823         if (tb[JAIL_ATTR_UBUS]) {
 824                 jail->ubus = blobmsg_get_bool(tb[JAIL_ATTR_UBUS]);
 825                 jail->argc++;
 826         }
 827         if (tb[JAIL_ATTR_LOG]) {
 828                 jail->log = blobmsg_get_bool(tb[JAIL_ATTR_LOG]);
 829                 jail->argc++;
 830         }
 831         if (tb[JAIL_ATTR_RONLY]) {
 832                 jail->ronly = blobmsg_get_bool(tb[JAIL_ATTR_RONLY]);
 833                 jail->argc++;
 834         }
 835         if (tb[JAIL_ATTR_MOUNT]) {
 836                 struct blob_attr *cur;
 837                 int rem;
 838
 839                 blobmsg_for_each_attr(cur, tb[JAIL_ATTR_MOUNT], rem)
 840                         jail->argc += 2;
 841                 instance_fill_array(&jail->mount, tb[JAIL_ATTR_MOUNT], NULL, false);
 842         }
 843         if (in->seccomp)
 844                 jail->argc += 2;
 845
 846         if (in->user)
 847                 jail->argc += 2;
 848
 849         if (in->group)
 850                 jail->argc += 2;
 851
 852         if (in->no_new_privs)
 853                 jail->argc++;
 854
 855         return 1;
 856 }
 857
 858 static bool
 859 instance_config_parse_command(struct service_instance *in, struct blob_attr **tb)
 860 {
 861         struct blob_attr *cur, *cur2;
 862         bool ret = false;
 863         int rem;
 864
 865         cur = tb[INSTANCE_ATTR_COMMAND];
 866         if (!cur) {
 867                 in->command = NULL;
 868                 return true;
 869         }
 870
 871         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 872                 return false;
 873
 874         blobmsg_for_each_attr(cur2, cur, rem) {
 875                 ret = true;
 876                 break;
 877         }
 878
 879         in->command = cur;
 880         return ret;
 881 }
 882
 883 static bool
 884 instance_config_parse(struct service_instance *in)
 885 {
 886         struct blob_attr *tb[__INSTANCE_ATTR_MAX];
 887         struct blob_attr *cur, *cur2;
 888         int rem;
 889
 890         blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
 891                 blobmsg_data(in->config), blobmsg_data_len(in->config));
 892
 893         if (!instance_config_parse_command(in, tb))
 894                 return false;
 895
 896         if (tb[INSTANCE_ATTR_TERMTIMEOUT])
 897                 in->term_timeout = blobmsg_get_u32(tb[INSTANCE_ATTR_TERMTIMEOUT]);
 898         if (tb[INSTANCE_ATTR_RESPAWN]) {
 899                 int i = 0;
 900                 uint32_t vals[3] = { 3600, 5, 5};
 901
 902                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_RESPAWN], rem) {
 903                         if ((i >= 3) && (blobmsg_type(cur2) == BLOBMSG_TYPE_STRING))
 904                                 continue;
 905                         vals[i] = atoi(blobmsg_get_string(cur2));
 906                         i++;
 907                 }
 908                 in->respawn = true;
 909                 in->respawn_count = 0;
 910                 in->respawn_threshold = vals[0];
 911                 in->respawn_timeout = vals[1];
 912                 in->respawn_retry = vals[2];
 913         }
 914         if (tb[INSTANCE_ATTR_TRIGGER]) {
 915                 in->trigger = tb[INSTANCE_ATTR_TRIGGER];
 916                 trigger_add(in->trigger, in);
 917         }
 918
 919         if (tb[INSTANCE_ATTR_WATCH]) {
 920                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_WATCH], rem) {
 921                         if (blobmsg_type(cur2) != BLOBMSG_TYPE_STRING)
 922                                 continue;
 923                         DEBUG(3, "watch for %s\n", blobmsg_get_string(cur2));
 924                         watch_add(blobmsg_get_string(cur2), in);
 925                 }
 926         }
 927
 928         if ((cur = tb[INSTANCE_ATTR_NICE])) {
 929                 in->nice = (int8_t) blobmsg_get_u32(cur);
 930                 if (in->nice < -20 || in->nice > 20)
 931                         return false;
 932         }
 933
 934         if (tb[INSTANCE_ATTR_USER]) {
 935                 const char *user = blobmsg_get_string(tb[INSTANCE_ATTR_USER]);
 936                 struct passwd *p = getpwnam(user);
 937                 if (p) {
 938                         in->user = strdup(user);
 939                         in->uid = p->pw_uid;
 940                         in->gr_gid = in->pw_gid = p->pw_gid;
 941                 }
 942         }
 943
 944         if (tb[INSTANCE_ATTR_GROUP]) {
 945                 const char *group = blobmsg_get_string(tb[INSTANCE_ATTR_GROUP]);
 946                 struct group *p = getgrnam(group);
 947                 if (p) {
 948                         in->group = strdup(group);
 949                         in->gr_gid = p->gr_gid;
 950                 }
 951         }
 952
 953         if (tb[INSTANCE_ATTR_TRACE])
 954                 in->trace = blobmsg_get_bool(tb[INSTANCE_ATTR_TRACE]);
 955
 956         if (tb[INSTANCE_ATTR_NO_NEW_PRIVS])
 957                 in->no_new_privs = blobmsg_get_bool(tb[INSTANCE_ATTR_NO_NEW_PRIVS]);
 958
 959         if (!in->trace && tb[INSTANCE_ATTR_SECCOMP])
 960                 in->seccomp = strdup(blobmsg_get_string(tb[INSTANCE_ATTR_SECCOMP]));
 961
 962         if (tb[INSTANCE_ATTR_PIDFILE]) {
 963                 char *pidfile = blobmsg_get_string(tb[INSTANCE_ATTR_PIDFILE]);
 964                 if (pidfile)
 965                         in->pidfile = strdup(pidfile);
 966         }
 967
 968         if (tb[INSTANCE_ATTR_RELOADSIG])
 969                 in->reload_signal = blobmsg_get_u32(tb[INSTANCE_ATTR_RELOADSIG]);
 970
 971         if (!in->trace && tb[INSTANCE_ATTR_JAIL])
 972                 in->has_jail = instance_jail_parse(in, tb[INSTANCE_ATTR_JAIL]);
 973
 974         if (tb[INSTANCE_ATTR_STDOUT] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDOUT]))
 975                 in->_stdout.fd.fd = -1;
 976
 977         if (tb[INSTANCE_ATTR_STDERR] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDERR]))
 978                 in->_stderr.fd.fd = -1;
 979
 980         instance_fill_any(&in->data, tb[INSTANCE_ATTR_DATA]);
 981
 982         if (!instance_fill_array(&in->env, tb[INSTANCE_ATTR_ENV], NULL, false))
 983                 return false;
 984
 985         if (!instance_fill_array(&in->netdev, tb[INSTANCE_ATTR_NETDEV], instance_netdev_update, true))
 986                 return false;
 987
 988         if (!instance_fill_array(&in->file, tb[INSTANCE_ATTR_FILE], instance_file_update, true))
 989                 return false;
 990
 991         if (!instance_fill_array(&in->limits, tb[INSTANCE_ATTR_LIMITS], NULL, false))
 992                 return false;
 993
 994         if (!instance_fill_array(&in->errors, tb[INSTANCE_ATTR_ERROR], NULL, true))
 995                 return false;
 996
 997         if (tb[INSTANCE_ATTR_FACILITY]) {
 998                 int facility = syslog_facility_str_to_int(blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
 999                 if (facility != -1) {
1000                         in->syslog_facility = facility;
1001                         DEBUG(3, "setting facility '%s'\n", blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
1002                 } else
1003                         DEBUG(3, "unknown syslog facility '%s' given, using default (LOG_DAEMON)\n", blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
1004         }
1005
1006         return true;
1007 }
1008
1009 static void
1010 instance_config_cleanup(struct service_instance *in)
1011 {
1012         blobmsg_list_free(&in->env);
1013         blobmsg_list_free(&in->data);
1014         blobmsg_list_free(&in->netdev);
1015         blobmsg_list_free(&in->file);
1016         blobmsg_list_free(&in->limits);
1017         blobmsg_list_free(&in->errors);
1018         blobmsg_list_free(&in->jail.mount);
1019 }
1020
1021 static void
1022 instance_config_move_strdup(char **dst, char *src)
1023 {
1024         if (!*dst)
1025                 return;
1026
1027         free(*dst);
1028         *dst = NULL;
1029
1030         if (!src)
1031                 return;
1032
1033         *dst = strdup(src);
1034 }
1035
1036 static void
1037 instance_config_move(struct service_instance *in, struct service_instance *in_src)
1038 {
1039         instance_config_cleanup(in);
1040         blobmsg_list_move(&in->env, &in_src->env);
1041         blobmsg_list_move(&in->data, &in_src->data);
1042         blobmsg_list_move(&in->netdev, &in_src->netdev);
1043         blobmsg_list_move(&in->file, &in_src->file);
1044         blobmsg_list_move(&in->limits, &in_src->limits);
1045         blobmsg_list_move(&in->errors, &in_src->errors);
1046         blobmsg_list_move(&in->jail.mount, &in_src->jail.mount);
1047         in->trigger = in_src->trigger;
1048         in->command = in_src->command;
1049         in->respawn = in_src->respawn;
1050         in->respawn_retry = in_src->respawn_retry;
1051         in->respawn_threshold = in_src->respawn_threshold;
1052         in->respawn_timeout = in_src->respawn_timeout;
1053         in->name = in_src->name;
1054         in->trace = in_src->trace;
1055         in->node.avl.key = in_src->node.avl.key;
1056         in->syslog_facility = in_src->syslog_facility;
1057
1058         instance_config_move_strdup(&in->pidfile, in_src->pidfile);
1059         instance_config_move_strdup(&in->seccomp, in_src->seccomp);
1060         instance_config_move_strdup(&in->jail.name, in_src->jail.name);
1061         instance_config_move_strdup(&in->jail.hostname, in_src->jail.hostname);
1062
1063         free(in->config);
1064         in->config = in_src->config;
1065         in_src->config = NULL;
1066 }
1067
1068 void
1069 instance_update(struct service_instance *in, struct service_instance *in_new)
1070 {
1071         bool changed = instance_config_changed(in, in_new);
1072         bool running = in->proc.pending;
1073         bool stopping = in->halt;
1074
1075         if (!running || stopping) {
1076                 instance_config_move(in, in_new);
1077                 instance_start(in);
1078         } else {
1079                 if (changed)
1080                         instance_restart(in);
1081                 instance_config_move(in, in_new);
1082                 /* restart happens in the child callback handler */
1083         }
1084 }
1085
1086 void
1087 instance_free(struct service_instance *in)
1088 {
1089         instance_free_stdio(in);
1090         uloop_process_delete(&in->proc);
1091         uloop_timeout_cancel(&in->timeout);
1092         trigger_del(in);
1093         watch_del(in);
1094         instance_config_cleanup(in);
1095         free(in->config);
1096         free(in->user);
1097         free(in->group);
1098         free(in->jail.name);
1099         free(in->jail.hostname);
1100         free(in->seccomp);
1101         free(in->pidfile);
1102         free(in);
1103 }
1104
1105 void
1106 instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
1107 {
1108         config = blob_memdup(config);
1109         in->srv = s;
1110         in->name = blobmsg_name(config);
1111         in->config = config;
1112         in->timeout.cb = instance_timeout;
1113         in->proc.cb = instance_exit;
1114         in->term_timeout = 5;
1115         in->syslog_facility = LOG_DAEMON;
1116
1117         in->_stdout.fd.fd = -2;
1118         in->_stdout.stream.string_data = true;
1119         in->_stdout.stream.notify_read = instance_stdout;
1120
1121         in->_stderr.fd.fd = -2;
1122         in->_stderr.stream.string_data = true;
1123         in->_stderr.stream.notify_read = instance_stderr;
1124
1125         blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
1126         blobmsg_list_init(&in->file, struct instance_file, node, instance_file_cmp);
1127         blobmsg_list_simple_init(&in->env);
1128         blobmsg_list_simple_init(&in->data);
1129         blobmsg_list_simple_init(&in->limits);
1130         blobmsg_list_simple_init(&in->errors);
1131         blobmsg_list_simple_init(&in->jail.mount);
1132         in->valid = instance_config_parse(in);
1133 }
1134
1135 void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
1136 {
1137         void *i;
1138
1139         if (!in->valid)
1140                 return;
1141
1142         i = blobmsg_open_table(b, in->name);
1143         blobmsg_add_u8(b, "running", in->proc.pending);
1144         if (in->proc.pending)
1145                 blobmsg_add_u32(b, "pid", in->proc.pid);
1146         if (in->command)
1147                 blobmsg_add_blob(b, in->command);
1148         blobmsg_add_u32(b, "term_timeout", in->term_timeout);
1149
1150         if (!avl_is_empty(&in->errors.avl)) {
1151                 struct blobmsg_list_node *var;
1152                 void *e = blobmsg_open_array(b, "errors");
1153                 blobmsg_list_for_each(&in->errors, var)
1154                         blobmsg_add_string(b, NULL, blobmsg_data(var->data));
1155                 blobmsg_close_table(b, e);
1156         }
1157
1158         if (!avl_is_empty(&in->env.avl)) {
1159                 struct blobmsg_list_node *var;
1160                 void *e = blobmsg_open_table(b, "env");
1161                 blobmsg_list_for_each(&in->env, var)
1162                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1163                 blobmsg_close_table(b, e);
1164         }
1165
1166         if (!avl_is_empty(&in->data.avl)) {
1167                 struct blobmsg_list_node *var;
1168                 void *e = blobmsg_open_table(b, "data");
1169                 blobmsg_list_for_each(&in->data, var)
1170                         blobmsg_add_blob(b, var->data);
1171                 blobmsg_close_table(b, e);
1172         }
1173
1174         if (!avl_is_empty(&in->limits.avl)) {
1175                 struct blobmsg_list_node *var;
1176                 void *e = blobmsg_open_table(b, "limits");
1177                 blobmsg_list_for_each(&in->limits, var)
1178                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1179                 blobmsg_close_table(b, e);
1180         }
1181
1182         if (in->reload_signal)
1183                 blobmsg_add_u32(b, "reload_signal", in->reload_signal);
1184
1185         if (in->respawn) {
1186                 void *r = blobmsg_open_table(b, "respawn");
1187                 blobmsg_add_u32(b, "threshold", in->respawn_threshold);
1188                 blobmsg_add_u32(b, "timeout", in->respawn_timeout);
1189                 blobmsg_add_u32(b, "retry", in->respawn_retry);
1190                 blobmsg_close_table(b, r);
1191         }
1192
1193         if (in->trace)
1194                 blobmsg_add_u8(b, "trace", true);
1195
1196         if (in->no_new_privs)
1197                 blobmsg_add_u8(b, "no_new_privs", true);
1198
1199         if (in->seccomp)
1200                 blobmsg_add_string(b, "seccomp", in->seccomp);
1201
1202         if (in->pidfile)
1203                 blobmsg_add_string(b, "pidfile", in->pidfile);
1204
1205         if (in->user)
1206                 blobmsg_add_string(b, "user", in->user);
1207
1208         if (in->group)
1209                 blobmsg_add_string(b, "group", in->group);
1210
1211         if (in->has_jail) {
1212                 void *r = blobmsg_open_table(b, "jail");
1213                 if (in->jail.name)
1214                         blobmsg_add_string(b, "name", in->jail.name);
1215                 if (in->jail.hostname)
1216                         blobmsg_add_string(b, "hostname", in->jail.hostname);
1217                 blobmsg_add_u8(b, "procfs", in->jail.procfs);
1218                 blobmsg_add_u8(b, "sysfs", in->jail.sysfs);
1219                 blobmsg_add_u8(b, "ubus", in->jail.ubus);
1220                 blobmsg_add_u8(b, "log", in->jail.log);
1221                 blobmsg_add_u8(b, "ronly", in->jail.ronly);
1222                 blobmsg_close_table(b, r);
1223                 if (!avl_is_empty(&in->jail.mount.avl)) {
1224                         struct blobmsg_list_node *var;
1225                         void *e = blobmsg_open_table(b, "mount");
1226                         blobmsg_list_for_each(&in->jail.mount, var)
1227                                 blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1228                         blobmsg_close_table(b, e);
1229                 }
1230         }
1231
1232         if (verbose && in->trigger)
1233                 blobmsg_add_blob(b, in->trigger);
1234
1235         blobmsg_close_table(b, i);
1236 }