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 (in->respawn_retry != in_new->respawn_retry)
 630                 return true;
 631         if (in->respawn_threshold != in_new->respawn_threshold)
 632                 return true;
 633         if (in->respawn_timeout != in_new->respawn_timeout)
 634                 return true;
 635
 636         if (!blobmsg_list_equal(&in->limits, &in_new->limits))
 637                 return true;
 638
 639         if (!blobmsg_list_equal(&in->jail.mount, &in_new->jail.mount))
 640                 return true;
 641
 642         if (!blobmsg_list_equal(&in->errors, &in_new->errors))
 643                 return true;
 644
 645         return false;
 646 }
 647
 648 static bool
 649 instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 650 {
 651         struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
 652         struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
 653
 654         return n1->ifindex == n2->ifindex;
 655 }
 656
 657 static void
 658 instance_netdev_update(struct blobmsg_list_node *l)
 659 {
 660         struct instance_netdev *n = container_of(l, struct instance_netdev, node);
 661
 662         n->ifindex = if_nametoindex(n->node.avl.key);
 663 }
 664
 665 static bool
 666 instance_file_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 667 {
 668         struct instance_file *f1 = container_of(l1, struct instance_file, node);
 669         struct instance_file *f2 = container_of(l2, struct instance_file, node);
 670
 671         return !memcmp(f1->md5, f2->md5, sizeof(f1->md5));
 672 }
 673
 674 static void
 675 instance_file_update(struct blobmsg_list_node *l)
 676 {
 677         struct instance_file *f = container_of(l, struct instance_file, node);
 678         md5_ctx_t md5;
 679         char buf[256];
 680         int len, fd;
 681
 682         memset(f->md5, 0, sizeof(f->md5));
 683
 684         fd = open(l->avl.key, O_RDONLY);
 685         if (fd < 0)
 686                 return;
 687
 688         md5_begin(&md5);
 689         do {
 690                 len = read(fd, buf, sizeof(buf));
 691                 if (len < 0) {
 692                         if (errno == EINTR)
 693                                 continue;
 694
 695                         break;
 696                 }
 697                 if (!len)
 698                         break;
 699
 700                 md5_hash(buf, len, &md5);
 701         } while(1);
 702
 703         md5_end(f->md5, &md5);
 704         close(fd);
 705 }
 706
 707 static void
 708 instance_fill_any(struct blobmsg_list *l, struct blob_attr *cur)
 709 {
 710         if (!cur)
 711                 return;
 712
 713         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), false);
 714 }
 715
 716 static bool
 717 instance_fill_array(struct blobmsg_list *l, struct blob_attr *cur, blobmsg_update_cb cb, bool array)
 718 {
 719         struct blobmsg_list_node *node;
 720
 721         if (!cur)
 722                 return true;
 723
 724         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 725                 return false;
 726
 727         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), array);
 728         if (cb) {
 729                 blobmsg_list_for_each(l, node)
 730                         cb(node);
 731         }
 732         return true;
 733 }
 734
 735 static int
 736 instance_jail_parse(struct service_instance *in, struct blob_attr *attr)
 737 {
 738         struct blob_attr *tb[__JAIL_ATTR_MAX];
 739         struct jail *jail = &in->jail;
 740         struct stat s;
 741
 742         if (stat("/sbin/ujail", &s))
 743                 return 0;
 744
 745         blobmsg_parse(jail_attr, __JAIL_ATTR_MAX, tb,
 746                 blobmsg_data(attr), blobmsg_data_len(attr));
 747
 748         jail->argc = 2;
 749
 750         if (tb[JAIL_ATTR_NAME]) {
 751                 jail->name = blobmsg_get_string(tb[JAIL_ATTR_NAME]);
 752                 jail->argc += 2;
 753         }
 754         if (tb[JAIL_ATTR_HOSTNAME]) {
 755                 jail->hostname = blobmsg_get_string(tb[JAIL_ATTR_HOSTNAME]);
 756                 jail->argc += 2;
 757         }
 758         if (tb[JAIL_ATTR_PROCFS]) {
 759                 jail->procfs = blobmsg_get_bool(tb[JAIL_ATTR_PROCFS]);
 760                 jail->argc++;
 761         }
 762         if (tb[JAIL_ATTR_SYSFS]) {
 763                 jail->sysfs = blobmsg_get_bool(tb[JAIL_ATTR_SYSFS]);
 764                 jail->argc++;
 765         }
 766         if (tb[JAIL_ATTR_UBUS]) {
 767                 jail->ubus = blobmsg_get_bool(tb[JAIL_ATTR_UBUS]);
 768                 jail->argc++;
 769         }
 770         if (tb[JAIL_ATTR_LOG]) {
 771                 jail->log = blobmsg_get_bool(tb[JAIL_ATTR_LOG]);
 772                 jail->argc++;
 773         }
 774         if (tb[JAIL_ATTR_RONLY]) {
 775                 jail->ronly = blobmsg_get_bool(tb[JAIL_ATTR_RONLY]);
 776                 jail->argc++;
 777         }
 778         if (tb[JAIL_ATTR_MOUNT]) {
 779                 struct blob_attr *cur;
 780                 int rem;
 781
 782                 blobmsg_for_each_attr(cur, tb[JAIL_ATTR_MOUNT], rem)
 783                         jail->argc += 2;
 784                 instance_fill_array(&jail->mount, tb[JAIL_ATTR_MOUNT], NULL, false);
 785         }
 786         if (in->seccomp)
 787                 jail->argc += 2;
 788
 789         return 1;
 790 }
 791
 792 static bool
 793 instance_config_parse_command(struct service_instance *in, struct blob_attr **tb)
 794 {
 795         struct blob_attr *cur, *cur2;
 796         bool ret = false;
 797         int rem;
 798
 799         cur = tb[INSTANCE_ATTR_COMMAND];
 800         if (!cur) {
 801                 in->command = NULL;
 802                 return true;
 803         }
 804
 805         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 806                 return false;
 807
 808         blobmsg_for_each_attr(cur2, cur, rem) {
 809                 ret = true;
 810                 break;
 811         }
 812
 813         in->command = cur;
 814         return ret;
 815 }
 816
 817 static bool
 818 instance_config_parse(struct service_instance *in)
 819 {
 820         struct blob_attr *tb[__INSTANCE_ATTR_MAX];
 821         struct blob_attr *cur, *cur2;
 822         int rem;
 823
 824         blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
 825                 blobmsg_data(in->config), blobmsg_data_len(in->config));
 826
 827         if (!instance_config_parse_command(in, tb))
 828                 return false;
 829
 830         if (tb[INSTANCE_ATTR_TERMTIMEOUT])
 831                 in->term_timeout = blobmsg_get_u32(tb[INSTANCE_ATTR_TERMTIMEOUT]);
 832         if (tb[INSTANCE_ATTR_RESPAWN]) {
 833                 int i = 0;
 834                 uint32_t vals[3] = { 3600, 5, 5};
 835
 836                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_RESPAWN], rem) {
 837                         if ((i >= 3) && (blobmsg_type(cur2) == BLOBMSG_TYPE_STRING))
 838                                 continue;
 839                         vals[i] = atoi(blobmsg_get_string(cur2));
 840                         i++;
 841                 }
 842                 in->respawn = true;
 843                 in->respawn_count = 0;
 844                 in->respawn_threshold = vals[0];
 845                 in->respawn_timeout = vals[1];
 846                 in->respawn_retry = vals[2];
 847         }
 848         if (tb[INSTANCE_ATTR_TRIGGER]) {
 849                 in->trigger = tb[INSTANCE_ATTR_TRIGGER];
 850                 trigger_add(in->trigger, in);
 851         }
 852
 853         if (tb[INSTANCE_ATTR_WATCH]) {
 854                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_WATCH], rem) {
 855                         if (blobmsg_type(cur2) != BLOBMSG_TYPE_STRING)
 856                                 continue;
 857                         DEBUG(3, "watch for %s\n", blobmsg_get_string(cur2));
 858                         watch_add(blobmsg_get_string(cur2), in);
 859                 }
 860         }
 861
 862         if ((cur = tb[INSTANCE_ATTR_NICE])) {
 863                 in->nice = (int8_t) blobmsg_get_u32(cur);
 864                 if (in->nice < -20 || in->nice > 20)
 865                         return false;
 866         }
 867
 868         if (tb[INSTANCE_ATTR_USER]) {
 869                 struct passwd *p = getpwnam(blobmsg_get_string(tb[INSTANCE_ATTR_USER]));
 870                 if (p) {
 871                         in->uid = p->pw_uid;
 872                         in->gid = p->pw_gid;
 873                 }
 874         }
 875
 876         if (tb[INSTANCE_ATTR_TRACE])
 877                 in->trace = blobmsg_get_bool(tb[INSTANCE_ATTR_TRACE]);
 878
 879         if (tb[INSTANCE_ATTR_NO_NEW_PRIVS])
 880                 in->no_new_privs = blobmsg_get_bool(tb[INSTANCE_ATTR_NO_NEW_PRIVS]);
 881
 882         if (!in->trace && tb[INSTANCE_ATTR_SECCOMP])
 883                 in->seccomp = blobmsg_get_string(tb[INSTANCE_ATTR_SECCOMP]);
 884
 885         if (tb[INSTANCE_ATTR_PIDFILE]) {
 886                 char *pidfile = blobmsg_get_string(tb[INSTANCE_ATTR_PIDFILE]);
 887                 if (pidfile)
 888                         in->pidfile = pidfile;
 889         }
 890
 891         if (tb[INSTANCE_ATTR_RELOADSIG])
 892                 in->reload_signal = blobmsg_get_u32(tb[INSTANCE_ATTR_RELOADSIG]);
 893
 894         if (!in->trace && tb[INSTANCE_ATTR_JAIL])
 895                 in->has_jail = instance_jail_parse(in, tb[INSTANCE_ATTR_JAIL]);
 896
 897         if (tb[INSTANCE_ATTR_STDOUT] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDOUT]))
 898                 in->_stdout.fd.fd = -1;
 899
 900         if (tb[INSTANCE_ATTR_STDERR] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDERR]))
 901                 in->_stderr.fd.fd = -1;
 902
 903         instance_fill_any(&in->data, tb[INSTANCE_ATTR_DATA]);
 904
 905         if (!instance_fill_array(&in->env, tb[INSTANCE_ATTR_ENV], NULL, false))
 906                 return false;
 907
 908         if (!instance_fill_array(&in->netdev, tb[INSTANCE_ATTR_NETDEV], instance_netdev_update, true))
 909                 return false;
 910
 911         if (!instance_fill_array(&in->file, tb[INSTANCE_ATTR_FILE], instance_file_update, true))
 912                 return false;
 913
 914         if (!instance_fill_array(&in->limits, tb[INSTANCE_ATTR_LIMITS], NULL, false))
 915                 return false;
 916
 917         if (!instance_fill_array(&in->errors, tb[INSTANCE_ATTR_ERROR], NULL, true))
 918                 return false;
 919
 920         return true;
 921 }
 922
 923 static void
 924 instance_config_cleanup(struct service_instance *in)
 925 {
 926         blobmsg_list_free(&in->env);
 927         blobmsg_list_free(&in->data);
 928         blobmsg_list_free(&in->netdev);
 929         blobmsg_list_free(&in->file);
 930         blobmsg_list_free(&in->limits);
 931         blobmsg_list_free(&in->errors);
 932         blobmsg_list_free(&in->jail.mount);
 933 }
 934
 935 static void
 936 instance_config_move(struct service_instance *in, struct service_instance *in_src)
 937 {
 938         instance_config_cleanup(in);
 939         blobmsg_list_move(&in->env, &in_src->env);
 940         blobmsg_list_move(&in->data, &in_src->data);
 941         blobmsg_list_move(&in->netdev, &in_src->netdev);
 942         blobmsg_list_move(&in->file, &in_src->file);
 943         blobmsg_list_move(&in->limits, &in_src->limits);
 944         blobmsg_list_move(&in->errors, &in_src->errors);
 945         blobmsg_list_move(&in->jail.mount, &in_src->jail.mount);
 946         in->trigger = in_src->trigger;
 947         in->command = in_src->command;
 948         in->pidfile = in_src->pidfile;
 949         in->respawn_retry = in_src->respawn_retry;
 950         in->respawn_threshold = in_src->respawn_threshold;
 951         in->respawn_timeout = in_src->respawn_timeout;
 952         in->name = in_src->name;
 953         in->trace = in_src->trace;
 954         in->node.avl.key = in_src->node.avl.key;
 955
 956         free(in->config);
 957         in->config = in_src->config;
 958         in_src->config = NULL;
 959 }
 960
 961 void
 962 instance_update(struct service_instance *in, struct service_instance *in_new)
 963 {
 964         bool changed = instance_config_changed(in, in_new);
 965         bool running = in->proc.pending;
 966         bool stopping = in->halt;
 967
 968         if (!running || stopping) {
 969                 instance_config_move(in, in_new);
 970                 instance_start(in);
 971         } else {
 972                 if (changed)
 973                         instance_restart(in);
 974                 instance_config_move(in, in_new);
 975                 /* restart happens in the child callback handler */
 976         }
 977 }
 978
 979 void
 980 instance_free(struct service_instance *in)
 981 {
 982         instance_free_stdio(in);
 983         uloop_process_delete(&in->proc);
 984         uloop_timeout_cancel(&in->timeout);
 985         trigger_del(in);
 986         watch_del(in);
 987         instance_config_cleanup(in);
 988         free(in->config);
 989         free(in);
 990 }
 991
 992 void
 993 instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
 994 {
 995         config = blob_memdup(config);
 996         in->srv = s;
 997         in->name = blobmsg_name(config);
 998         in->config = config;
 999         in->timeout.cb = instance_timeout;
1000         in->proc.cb = instance_exit;
1001         in->term_timeout = 5;
1002
1003         in->_stdout.fd.fd = -2;
1004         in->_stdout.stream.string_data = true;
1005         in->_stdout.stream.notify_read = instance_stdout;
1006
1007         in->_stderr.fd.fd = -2;
1008         in->_stderr.stream.string_data = true;
1009         in->_stderr.stream.notify_read = instance_stderr;
1010
1011         blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
1012         blobmsg_list_init(&in->file, struct instance_file, node, instance_file_cmp);
1013         blobmsg_list_simple_init(&in->env);
1014         blobmsg_list_simple_init(&in->data);
1015         blobmsg_list_simple_init(&in->limits);
1016         blobmsg_list_simple_init(&in->errors);
1017         blobmsg_list_simple_init(&in->jail.mount);
1018         in->valid = instance_config_parse(in);
1019 }
1020
1021 void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
1022 {
1023         void *i;
1024
1025         if (!in->valid)
1026                 return;
1027
1028         i = blobmsg_open_table(b, in->name);
1029         blobmsg_add_u8(b, "running", in->proc.pending);
1030         if (in->proc.pending)
1031                 blobmsg_add_u32(b, "pid", in->proc.pid);
1032         if (in->command)
1033                 blobmsg_add_blob(b, in->command);
1034         blobmsg_add_u32(b, "term_timeout", in->term_timeout);
1035
1036         if (!avl_is_empty(&in->errors.avl)) {
1037                 struct blobmsg_list_node *var;
1038                 void *e = blobmsg_open_array(b, "errors");
1039                 blobmsg_list_for_each(&in->errors, var)
1040                         blobmsg_add_string(b, NULL, blobmsg_data(var->data));
1041                 blobmsg_close_table(b, e);
1042         }
1043
1044         if (!avl_is_empty(&in->env.avl)) {
1045                 struct blobmsg_list_node *var;
1046                 void *e = blobmsg_open_table(b, "env");
1047                 blobmsg_list_for_each(&in->env, var)
1048                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1049                 blobmsg_close_table(b, e);
1050         }
1051
1052         if (!avl_is_empty(&in->data.avl)) {
1053                 struct blobmsg_list_node *var;
1054                 void *e = blobmsg_open_table(b, "data");
1055                 blobmsg_list_for_each(&in->data, var)
1056                         blobmsg_add_blob(b, var->data);
1057                 blobmsg_close_table(b, e);
1058         }
1059
1060         if (!avl_is_empty(&in->limits.avl)) {
1061                 struct blobmsg_list_node *var;
1062                 void *e = blobmsg_open_table(b, "limits");
1063                 blobmsg_list_for_each(&in->limits, var)
1064                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1065                 blobmsg_close_table(b, e);
1066         }
1067
1068         if (in->reload_signal)
1069                 blobmsg_add_u32(b, "reload_signal", in->reload_signal);
1070
1071         if (in->respawn) {
1072                 void *r = blobmsg_open_table(b, "respawn");
1073                 blobmsg_add_u32(b, "threshold", in->respawn_threshold);
1074                 blobmsg_add_u32(b, "timeout", in->respawn_timeout);
1075                 blobmsg_add_u32(b, "retry", in->respawn_retry);
1076                 blobmsg_close_table(b, r);
1077         }
1078
1079         if (in->trace)
1080                 blobmsg_add_u8(b, "trace", true);
1081
1082         if (in->no_new_privs)
1083                 blobmsg_add_u8(b, "no_new_privs", true);
1084
1085         if (in->seccomp)
1086                 blobmsg_add_string(b, "seccomp", in->seccomp);
1087
1088         if (in->pidfile)
1089                 blobmsg_add_string(b, "pidfile", in->pidfile);
1090
1091         if (in->has_jail) {
1092                 void *r = blobmsg_open_table(b, "jail");
1093                 if (in->jail.name)
1094                         blobmsg_add_string(b, "name", in->jail.name);
1095                 if (in->jail.hostname)
1096                         blobmsg_add_string(b, "hostname", in->jail.hostname);
1097                 blobmsg_add_u8(b, "procfs", in->jail.procfs);
1098                 blobmsg_add_u8(b, "sysfs", in->jail.sysfs);
1099                 blobmsg_add_u8(b, "ubus", in->jail.ubus);
1100                 blobmsg_add_u8(b, "log", in->jail.log);
1101                 blobmsg_add_u8(b, "ronly", in->jail.ronly);
1102                 blobmsg_close_table(b, r);
1103                 if (!avl_is_empty(&in->jail.mount.avl)) {
1104                         struct blobmsg_list_node *var;
1105                         void *e = blobmsg_open_table(b, "mount");
1106                         blobmsg_list_for_each(&in->jail.mount, var)
1107                                 blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1108                         blobmsg_close_table(b, e);
1109                 }
1110         }
1111
1112         if (verbose && in->trigger)
1113                 blobmsg_add_blob(b, in->trigger);
1114
1115         blobmsg_close_table(b, i);
1116 }