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