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