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