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