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