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