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