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_MAX
  57 };
  58
  59 static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = {
  60         [INSTANCE_ATTR_COMMAND] = { "command", BLOBMSG_TYPE_ARRAY },
  61         [INSTANCE_ATTR_ENV] = { "env", BLOBMSG_TYPE_TABLE },
  62         [INSTANCE_ATTR_DATA] = { "data", BLOBMSG_TYPE_TABLE },
  63         [INSTANCE_ATTR_NETDEV] = { "netdev", BLOBMSG_TYPE_ARRAY },
  64         [INSTANCE_ATTR_FILE] = { "file", BLOBMSG_TYPE_ARRAY },
  65         [INSTANCE_ATTR_TRIGGER] = { "triggers", BLOBMSG_TYPE_ARRAY },
  66         [INSTANCE_ATTR_RESPAWN] = { "respawn", BLOBMSG_TYPE_ARRAY },
  67         [INSTANCE_ATTR_NICE] = { "nice", BLOBMSG_TYPE_INT32 },
  68         [INSTANCE_ATTR_LIMITS] = { "limits", BLOBMSG_TYPE_TABLE },
  69         [INSTANCE_ATTR_WATCH] = { "watch", BLOBMSG_TYPE_ARRAY },
  70         [INSTANCE_ATTR_ERROR] = { "error", BLOBMSG_TYPE_ARRAY },
  71         [INSTANCE_ATTR_USER] = { "user", BLOBMSG_TYPE_STRING },
  72         [INSTANCE_ATTR_STDOUT] = { "stdout", BLOBMSG_TYPE_BOOL },
  73         [INSTANCE_ATTR_STDERR] = { "stderr", BLOBMSG_TYPE_BOOL },
  74         [INSTANCE_ATTR_NO_NEW_PRIVS] = { "no_new_privs", BLOBMSG_TYPE_BOOL },
  75         [INSTANCE_ATTR_JAIL] = { "jail", BLOBMSG_TYPE_TABLE },
  76         [INSTANCE_ATTR_TRACE] = { "trace", BLOBMSG_TYPE_BOOL },
  77         [INSTANCE_ATTR_SECCOMP] = { "seccomp", BLOBMSG_TYPE_STRING },
  78 };
  79
  80 enum {
  81         JAIL_ATTR_NAME,
  82         JAIL_ATTR_PROCFS,
  83         JAIL_ATTR_SYSFS,
  84         JAIL_ATTR_UBUS,
  85         JAIL_ATTR_LOG,
  86         JAIL_ATTR_RONLY,
  87         JAIL_ATTR_MOUNT,
  88         __JAIL_ATTR_MAX,
  89 };
  90
  91 static const struct blobmsg_policy jail_attr[__JAIL_ATTR_MAX] = {
  92         [JAIL_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
  93         [JAIL_ATTR_PROCFS] = { "procfs", BLOBMSG_TYPE_BOOL },
  94         [JAIL_ATTR_SYSFS] = { "sysfs", BLOBMSG_TYPE_BOOL },
  95         [JAIL_ATTR_UBUS] = { "ubus", BLOBMSG_TYPE_BOOL },
  96         [JAIL_ATTR_LOG] = { "log", BLOBMSG_TYPE_BOOL },
  97         [JAIL_ATTR_RONLY] = { "ronly", BLOBMSG_TYPE_BOOL },
  98         [JAIL_ATTR_MOUNT] = { "mount", BLOBMSG_TYPE_TABLE },
  99 };
 100
 101 struct instance_netdev {
 102         struct blobmsg_list_node node;
 103         int ifindex;
 104 };
 105
 106 struct instance_file {
 107         struct blobmsg_list_node node;
 108         uint32_t md5[4];
 109 };
 110
 111 struct rlimit_name {
 112         const char *name;
 113         int resource;
 114 };
 115
 116 static const struct rlimit_name rlimit_names[] = {
 117         { "as", RLIMIT_AS },
 118         { "core", RLIMIT_CORE },
 119         { "cpu", RLIMIT_CPU },
 120         { "data", RLIMIT_DATA },
 121         { "fsize", RLIMIT_FSIZE },
 122         { "memlock", RLIMIT_MEMLOCK },
 123         { "msgqueue", RLIMIT_MSGQUEUE },
 124         { "nice", RLIMIT_NICE },
 125         { "nofile", RLIMIT_NOFILE },
 126         { "nproc", RLIMIT_NPROC },
 127         { "rss", RLIMIT_RSS },
 128         { "rtprio", RLIMIT_RTPRIO },
 129         { "sigpending", RLIMIT_SIGPENDING },
 130         { "stack", RLIMIT_STACK },
 131         { NULL, 0 }
 132 };
 133
 134 static char trace[] = "/sbin/utrace";
 135
 136 static void closefd(int fd)
 137 {
 138         if (fd > STDERR_FILENO)
 139                 close(fd);
 140 }
 141
 142 static void
 143 instance_limits(const char *limit, const char *value)
 144 {
 145         int i;
 146         struct rlimit rlim;
 147         unsigned long cur, max;
 148
 149         for (i = 0; rlimit_names[i].name != NULL; i++) {
 150                 if (strcmp(rlimit_names[i].name, limit))
 151                         continue;
 152                 if (!strcmp(value, "unlimited")) {
 153                         rlim.rlim_cur = RLIM_INFINITY;
 154                         rlim.rlim_max = RLIM_INFINITY;
 155                 } else {
 156                         if (getrlimit(rlimit_names[i].resource, &rlim))
 157                                 return;
 158
 159                         cur = rlim.rlim_cur;
 160                         max = rlim.rlim_max;
 161
 162                         if (sscanf(value, "%lu %lu", &cur, &max) < 1)
 163                                 return;
 164
 165                         rlim.rlim_cur = cur;
 166                         rlim.rlim_max = max;
 167                 }
 168
 169                 setrlimit(rlimit_names[i].resource, &rlim);
 170                 return;
 171         }
 172 }
 173
 174 static inline int
 175 jail_run(struct service_instance *in, char **argv)
 176 {
 177         struct blobmsg_list_node *var;
 178         struct jail *jail = &in->jail;
 179         int argc = 0;
 180
 181         argv[argc++] = "/sbin/ujail";
 182
 183         if (jail->name) {
 184                 argv[argc++] = "-n";
 185                 argv[argc++] = jail->name;
 186         }
 187
 188         if (in->seccomp) {
 189                 argv[argc++] = "-S";
 190                 argv[argc++] = in->seccomp;
 191         }
 192
 193         if (in->no_new_privs)
 194                 argv[argc++] = "-c";
 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         if (jail->ronly)
 209                 argv[argc++] = "-o";
 210
 211         blobmsg_list_for_each(&jail->mount, var) {
 212                 const char *type = blobmsg_data(var->data);
 213
 214                 if (*type == '1')
 215                         argv[argc++] = "-w";
 216                 else
 217                         argv[argc++] = "-r";
 218                 argv[argc++] = (char *) blobmsg_name(var->data);
 219         }
 220
 221         argv[argc++] = "--";
 222
 223         return argc;
 224 }
 225
 226 static void
 227 instance_run(struct service_instance *in, int _stdout, int _stderr)
 228 {
 229         struct blobmsg_list_node *var;
 230         struct blob_attr *cur;
 231         char **argv;
 232         char *ld_preload;
 233         int argc = 1; /* NULL terminated */
 234         int rem, _stdin;
 235         bool seccomp = !in->trace && !in->has_jail && in->seccomp;
 236         bool setlbf = _stdout >= 0;
 237
 238         if (in->nice)
 239                 setpriority(PRIO_PROCESS, 0, in->nice);
 240
 241         blobmsg_for_each_attr(cur, in->command, rem)
 242                 argc++;
 243
 244         blobmsg_list_for_each(&in->env, var)
 245                 setenv(blobmsg_name(var->data), blobmsg_data(var->data), 1);
 246
 247         if (seccomp)
 248                 setenv("SECCOMP_FILE", in->seccomp, 1);
 249
 250         if ((seccomp || setlbf) && asprintf(&ld_preload, "LD_PRELOAD=%s%s%s",
 251                         seccomp ? "/lib/libpreload-seccomp.so" : "",
 252                         seccomp && setlbf ? ":" : "",
 253                         setlbf ? "/lib/libsetlbf.so" : "") > 0)
 254                 putenv(ld_preload);
 255
 256         blobmsg_list_for_each(&in->limits, var)
 257                 instance_limits(blobmsg_name(var->data), blobmsg_data(var->data));
 258
 259         if (in->trace)
 260                 argc += 1;
 261
 262         argv = alloca(sizeof(char *) * (argc + in->jail.argc));
 263         argc = 0;
 264
 265         if (in->trace)
 266                 argv[argc++] = trace;
 267
 268         if (in->has_jail)
 269                 argc = jail_run(in, argv);
 270
 271         blobmsg_for_each_attr(cur, in->command, rem)
 272                 argv[argc++] = blobmsg_data(cur);
 273
 274         argv[argc] = NULL;
 275
 276         _stdin = open("/dev/null", O_RDONLY);
 277
 278         if (_stdout == -1)
 279                 _stdout = open("/dev/null", O_WRONLY);
 280
 281         if (_stderr == -1)
 282                 _stderr = open("/dev/null", O_WRONLY);
 283
 284         if (_stdin > -1) {
 285                 dup2(_stdin, STDIN_FILENO);
 286                 closefd(_stdin);
 287         }
 288         if (_stdout > -1) {
 289                 dup2(_stdout, STDOUT_FILENO);
 290                 closefd(_stdout);
 291         }
 292         if (_stderr > -1) {
 293                 dup2(_stderr, STDERR_FILENO);
 294                 closefd(_stderr);
 295         }
 296
 297         if (in->gid && setgid(in->gid)) {
 298                 ERROR("failed to set group id %d: %d (%s)\n", in->gid, errno, strerror(errno));
 299                 exit(127);
 300         }
 301         if (in->uid && setuid(in->uid)) {
 302                 ERROR("failed to set user id %d: %d (%s)\n", in->uid, errno, strerror(errno));
 303                 exit(127);
 304         }
 305
 306         execvp(argv[0], argv);
 307         exit(127);
 308 }
 309
 310 static void
 311 instance_free_stdio(struct service_instance *in)
 312 {
 313         if (in->_stdout.fd.fd > -1) {
 314                 ustream_free(&in->_stdout.stream);
 315                 close(in->_stdout.fd.fd);
 316                 in->_stdout.fd.fd = -1;
 317         }
 318
 319         if (in->_stderr.fd.fd > -1) {
 320                 ustream_free(&in->_stderr.stream);
 321                 close(in->_stderr.fd.fd);
 322                 in->_stderr.fd.fd = -1;
 323         }
 324 }
 325
 326 void
 327 instance_start(struct service_instance *in)
 328 {
 329         int pid;
 330         int opipe[2] = { -1, -1 };
 331         int epipe[2] = { -1, -1 };
 332
 333         if (!avl_is_empty(&in->errors.avl)) {
 334                 LOG("Not starting instance %s::%s, an error was indicated\n", in->srv->name, in->name);
 335                 return;
 336         }
 337
 338         if (in->proc.pending)
 339                 return;
 340
 341         instance_free_stdio(in);
 342         if (in->_stdout.fd.fd > -2) {
 343                 if (pipe(opipe)) {
 344                         ULOG_WARN("pipe() failed: %d (%s)\n", errno, strerror(errno));
 345                         opipe[0] = opipe[1] = -1;
 346                 }
 347         }
 348
 349         if (in->_stderr.fd.fd > -2) {
 350                 if (pipe(epipe)) {
 351                         ULOG_WARN("pipe() failed: %d (%s)\n", errno, strerror(errno));
 352                         epipe[0] = epipe[1] = -1;
 353                 }
 354         }
 355
 356         in->restart = false;
 357         in->halt = !in->respawn;
 358
 359         if (!in->valid)
 360                 return;
 361
 362         pid = fork();
 363         if (pid < 0)
 364                 return;
 365
 366         if (!pid) {
 367                 uloop_done();
 368                 closefd(opipe[0]);
 369                 closefd(epipe[0]);
 370                 instance_run(in, opipe[1], epipe[1]);
 371                 return;
 372         }
 373
 374         DEBUG(2, "Started instance %s::%s\n", in->srv->name, in->name);
 375         in->proc.pid = pid;
 376         clock_gettime(CLOCK_MONOTONIC, &in->start);
 377         uloop_process_add(&in->proc);
 378
 379         if (opipe[0] > -1) {
 380                 ustream_fd_init(&in->_stdout, opipe[0]);
 381                 closefd(opipe[1]);
 382         }
 383
 384         if (epipe[0] > -1) {
 385                 ustream_fd_init(&in->_stderr, epipe[0]);
 386                 closefd(epipe[1]);
 387         }
 388
 389         service_event("instance.start", in->srv->name, in->name);
 390 }
 391
 392 static void
 393 instance_stdio(struct ustream *s, int prio, struct service_instance *in)
 394 {
 395         char *newline, *str, *arg0, ident[32];
 396         int len;
 397
 398         arg0 = basename(blobmsg_data(blobmsg_data(in->command)));
 399         snprintf(ident, sizeof(ident), "%s[%d]", arg0, in->proc.pid);
 400         ulog_open(ULOG_SYSLOG, LOG_DAEMON, ident);
 401
 402         do {
 403                 str = ustream_get_read_buf(s, NULL);
 404                 if (!str)
 405                         break;
 406
 407                 newline = strchr(str, '\n');
 408                 if (!newline)
 409                         break;
 410
 411                 *newline = 0;
 412                 ulog(prio, "%s\n", str);
 413
 414                 len = newline + 1 - str;
 415                 ustream_consume(s, len);
 416         } while (1);
 417
 418         ulog_open(ULOG_SYSLOG, LOG_DAEMON, "procd");
 419 }
 420
 421 static void
 422 instance_stdout(struct ustream *s, int bytes)
 423 {
 424         instance_stdio(s, LOG_INFO,
 425                        container_of(s, struct service_instance, _stdout.stream));
 426 }
 427
 428 static void
 429 instance_stderr(struct ustream *s, int bytes)
 430 {
 431         instance_stdio(s, LOG_ERR,
 432                        container_of(s, struct service_instance, _stderr.stream));
 433 }
 434
 435 static void
 436 instance_timeout(struct uloop_timeout *t)
 437 {
 438         struct service_instance *in;
 439
 440         in = container_of(t, struct service_instance, timeout);
 441
 442         if (!in->halt && (in->restart || in->respawn))
 443                 instance_start(in);
 444 }
 445
 446 static void
 447 instance_exit(struct uloop_process *p, int ret)
 448 {
 449         struct service_instance *in;
 450         struct timespec tp;
 451         long runtime;
 452
 453         in = container_of(p, struct service_instance, proc);
 454
 455         clock_gettime(CLOCK_MONOTONIC, &tp);
 456         runtime = tp.tv_sec - in->start.tv_sec;
 457
 458         DEBUG(2, "Instance %s::%s exit with error code %d after %ld seconds\n", in->srv->name, in->name, ret, runtime);
 459         if (upgrade_running)
 460                 return;
 461
 462         uloop_timeout_cancel(&in->timeout);
 463         if (in->halt) {
 464                 /* no action */
 465         } else if (in->restart) {
 466                 instance_start(in);
 467         } else if (in->respawn) {
 468                 if (runtime < in->respawn_threshold)
 469                         in->respawn_count++;
 470                 else
 471                         in->respawn_count = 0;
 472                 if (in->respawn_count > in->respawn_retry && in->respawn_retry > 0 ) {
 473                         LOG("Instance %s::%s s in a crash loop %d crashes, %ld seconds since last crash\n",
 474                                                                 in->srv->name, in->name, in->respawn_count, runtime);
 475                         in->restart = in->respawn = 0;
 476                         in->halt = 1;
 477                 } else {
 478                         uloop_timeout_set(&in->timeout, in->respawn_timeout * 1000);
 479                 }
 480         }
 481         service_event("instance.stop", in->srv->name, in->name);
 482 }
 483
 484 void
 485 instance_stop(struct service_instance *in)
 486 {
 487         if (!in->proc.pending)
 488                 return;
 489         in->halt = true;
 490         in->restart = in->respawn = false;
 491         kill(in->proc.pid, SIGTERM);
 492 }
 493
 494 static void
 495 instance_restart(struct service_instance *in)
 496 {
 497         if (!in->proc.pending)
 498                 return;
 499         in->halt = false;
 500         in->restart = true;
 501         kill(in->proc.pid, SIGTERM);
 502 }
 503
 504 static bool
 505 instance_config_changed(struct service_instance *in, struct service_instance *in_new)
 506 {
 507         if (!in->valid)
 508                 return true;
 509
 510         if (!blob_attr_equal(in->command, in_new->command))
 511                 return true;
 512
 513         if (!blobmsg_list_equal(&in->env, &in_new->env))
 514                 return true;
 515
 516         if (!blobmsg_list_equal(&in->data, &in_new->data))
 517                 return true;
 518
 519         if (!blobmsg_list_equal(&in->netdev, &in_new->netdev))
 520                 return true;
 521
 522         if (!blobmsg_list_equal(&in->file, &in_new->file))
 523                 return true;
 524
 525         if (in->nice != in_new->nice)
 526                 return true;
 527
 528         if (in->uid != in_new->uid)
 529                 return true;
 530
 531         if (in->gid != in_new->gid)
 532                 return true;
 533
 534         if (!blobmsg_list_equal(&in->limits, &in_new->limits))
 535                 return true;
 536
 537         if (!blobmsg_list_equal(&in->jail.mount, &in_new->jail.mount))
 538                 return true;
 539
 540         if (!blobmsg_list_equal(&in->errors, &in_new->errors))
 541                 return true;
 542
 543         return false;
 544 }
 545
 546 static bool
 547 instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 548 {
 549         struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
 550         struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
 551
 552         return n1->ifindex == n2->ifindex;
 553 }
 554
 555 static void
 556 instance_netdev_update(struct blobmsg_list_node *l)
 557 {
 558         struct instance_netdev *n = container_of(l, struct instance_netdev, node);
 559
 560         n->ifindex = if_nametoindex(n->node.avl.key);
 561 }
 562
 563 static bool
 564 instance_file_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 565 {
 566         struct instance_file *f1 = container_of(l1, struct instance_file, node);
 567         struct instance_file *f2 = container_of(l2, struct instance_file, node);
 568
 569         return !memcmp(f1->md5, f2->md5, sizeof(f1->md5));
 570 }
 571
 572 static void
 573 instance_file_update(struct blobmsg_list_node *l)
 574 {
 575         struct instance_file *f = container_of(l, struct instance_file, node);
 576         md5_ctx_t md5;
 577         char buf[256];
 578         int len, fd;
 579
 580         memset(f->md5, 0, sizeof(f->md5));
 581
 582         fd = open(l->avl.key, O_RDONLY);
 583         if (fd < 0)
 584                 return;
 585
 586         md5_begin(&md5);
 587         do {
 588                 len = read(fd, buf, sizeof(buf));
 589                 if (len < 0) {
 590                         if (errno == EINTR)
 591                                 continue;
 592
 593                         break;
 594                 }
 595                 if (!len)
 596                         break;
 597
 598                 md5_hash(buf, len, &md5);
 599         } while(1);
 600
 601         md5_end(f->md5, &md5);
 602         close(fd);
 603 }
 604
 605 static void
 606 instance_fill_any(struct blobmsg_list *l, struct blob_attr *cur)
 607 {
 608         if (!cur)
 609                 return;
 610
 611         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), false);
 612 }
 613
 614 static bool
 615 instance_fill_array(struct blobmsg_list *l, struct blob_attr *cur, blobmsg_update_cb cb, bool array)
 616 {
 617         struct blobmsg_list_node *node;
 618
 619         if (!cur)
 620                 return true;
 621
 622         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 623                 return false;
 624
 625         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), array);
 626         if (cb) {
 627                 blobmsg_list_for_each(l, node)
 628                         cb(node);
 629         }
 630         return true;
 631 }
 632
 633 static int
 634 instance_jail_parse(struct service_instance *in, struct blob_attr *attr)
 635 {
 636         struct blob_attr *tb[__JAIL_ATTR_MAX];
 637         struct jail *jail = &in->jail;
 638         struct stat s;
 639
 640         if (stat("/sbin/ujail", &s))
 641                 return 0;
 642
 643         blobmsg_parse(jail_attr, __JAIL_ATTR_MAX, tb,
 644                 blobmsg_data(attr), blobmsg_data_len(attr));
 645
 646         jail->argc = 2;
 647
 648         if (tb[JAIL_ATTR_NAME]) {
 649                 jail->name = blobmsg_get_string(tb[JAIL_ATTR_NAME]);
 650                 jail->argc += 2;
 651         }
 652         if (tb[JAIL_ATTR_PROCFS]) {
 653                 jail->procfs = blobmsg_get_bool(tb[JAIL_ATTR_PROCFS]);
 654                 jail->argc++;
 655         }
 656         if (tb[JAIL_ATTR_SYSFS]) {
 657                 jail->sysfs = blobmsg_get_bool(tb[JAIL_ATTR_SYSFS]);
 658                 jail->argc++;
 659         }
 660         if (tb[JAIL_ATTR_UBUS]) {
 661                 jail->ubus = blobmsg_get_bool(tb[JAIL_ATTR_UBUS]);
 662                 jail->argc++;
 663         }
 664         if (tb[JAIL_ATTR_LOG]) {
 665                 jail->log = blobmsg_get_bool(tb[JAIL_ATTR_LOG]);
 666                 jail->argc++;
 667         }
 668         if (tb[JAIL_ATTR_RONLY]) {
 669                 jail->ronly = blobmsg_get_bool(tb[JAIL_ATTR_RONLY]);
 670                 jail->argc++;
 671         }
 672         if (tb[JAIL_ATTR_MOUNT]) {
 673                 struct blob_attr *cur;
 674                 int rem;
 675
 676                 blobmsg_for_each_attr(cur, tb[JAIL_ATTR_MOUNT], rem)
 677                         jail->argc += 2;
 678                 instance_fill_array(&jail->mount, tb[JAIL_ATTR_MOUNT], NULL, false);
 679         }
 680         if (in->seccomp)
 681                 jail->argc += 2;
 682
 683         return 1;
 684 }
 685
 686 static bool
 687 instance_config_parse(struct service_instance *in)
 688 {
 689         struct blob_attr *tb[__INSTANCE_ATTR_MAX];
 690         struct blob_attr *cur, *cur2;
 691         int argc = 0;
 692         int rem;
 693
 694         blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
 695                 blobmsg_data(in->config), blobmsg_data_len(in->config));
 696
 697         cur = tb[INSTANCE_ATTR_COMMAND];
 698         if (!cur)
 699                 return false;
 700
 701         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 702                 return false;
 703
 704         blobmsg_for_each_attr(cur2, cur, rem) {
 705                 argc++;
 706                 break;
 707         }
 708         if (!argc)
 709                 return false;
 710
 711         in->command = cur;
 712
 713         if (tb[INSTANCE_ATTR_RESPAWN]) {
 714                 int i = 0;
 715                 uint32_t vals[3] = { 3600, 5, 5};
 716
 717                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_RESPAWN], rem) {
 718                         if ((i >= 3) && (blobmsg_type(cur2) == BLOBMSG_TYPE_STRING))
 719                                 continue;
 720                         vals[i] = atoi(blobmsg_get_string(cur2));
 721                         i++;
 722                 }
 723                 in->respawn = true;
 724                 in->respawn_count = 0;
 725                 in->respawn_threshold = vals[0];
 726                 in->respawn_timeout = vals[1];
 727                 in->respawn_retry = vals[2];
 728         }
 729         if (tb[INSTANCE_ATTR_TRIGGER]) {
 730                 in->trigger = tb[INSTANCE_ATTR_TRIGGER];
 731                 trigger_add(in->trigger, in);
 732         }
 733
 734         if (tb[INSTANCE_ATTR_WATCH]) {
 735                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_WATCH], rem) {
 736                         if (blobmsg_type(cur2) != BLOBMSG_TYPE_STRING)
 737                                 continue;
 738                         DEBUG(3, "watch for %s\n", blobmsg_get_string(cur2));
 739                         watch_add(blobmsg_get_string(cur2), in);
 740                 }
 741         }
 742
 743         if ((cur = tb[INSTANCE_ATTR_NICE])) {
 744                 in->nice = (int8_t) blobmsg_get_u32(cur);
 745                 if (in->nice < -20 || in->nice > 20)
 746                         return false;
 747         }
 748
 749         if (tb[INSTANCE_ATTR_USER]) {
 750                 struct passwd *p = getpwnam(blobmsg_get_string(tb[INSTANCE_ATTR_USER]));
 751                 if (p) {
 752                         in->uid = p->pw_uid;
 753                         in->gid = p->pw_gid;
 754                 }
 755         }
 756
 757         if (tb[INSTANCE_ATTR_TRACE])
 758                 in->trace = blobmsg_get_bool(tb[INSTANCE_ATTR_TRACE]);
 759
 760         if (tb[INSTANCE_ATTR_NO_NEW_PRIVS])
 761                 in->no_new_privs = blobmsg_get_bool(tb[INSTANCE_ATTR_NO_NEW_PRIVS]);
 762
 763         if (!in->trace && tb[INSTANCE_ATTR_SECCOMP]) {
 764                 char *seccomp = blobmsg_get_string(tb[INSTANCE_ATTR_SECCOMP]);
 765                 struct stat s;
 766
 767                 if (stat(seccomp, &s))
 768                         ERROR("%s: not starting seccomp as %s is missing\n", in->name, seccomp);
 769                 else
 770                         in->seccomp = seccomp;
 771         }
 772         if (!in->trace && tb[INSTANCE_ATTR_JAIL])
 773                 in->has_jail = instance_jail_parse(in, tb[INSTANCE_ATTR_JAIL]);
 774
 775         if (tb[INSTANCE_ATTR_STDOUT] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDOUT]))
 776                 in->_stdout.fd.fd = -1;
 777
 778         if (tb[INSTANCE_ATTR_STDERR] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDERR]))
 779                 in->_stderr.fd.fd = -1;
 780
 781         instance_fill_any(&in->data, tb[INSTANCE_ATTR_DATA]);
 782
 783         if (!instance_fill_array(&in->env, tb[INSTANCE_ATTR_ENV], NULL, false))
 784                 return false;
 785
 786         if (!instance_fill_array(&in->netdev, tb[INSTANCE_ATTR_NETDEV], instance_netdev_update, true))
 787                 return false;
 788
 789         if (!instance_fill_array(&in->file, tb[INSTANCE_ATTR_FILE], instance_file_update, true))
 790                 return false;
 791
 792         if (!instance_fill_array(&in->limits, tb[INSTANCE_ATTR_LIMITS], NULL, false))
 793                 return false;
 794
 795         if (!instance_fill_array(&in->errors, tb[INSTANCE_ATTR_ERROR], NULL, true))
 796                 return false;
 797
 798         return true;
 799 }
 800
 801 static void
 802 instance_config_cleanup(struct service_instance *in)
 803 {
 804         blobmsg_list_free(&in->env);
 805         blobmsg_list_free(&in->data);
 806         blobmsg_list_free(&in->netdev);
 807         blobmsg_list_free(&in->file);
 808         blobmsg_list_free(&in->limits);
 809         blobmsg_list_free(&in->errors);
 810         blobmsg_list_free(&in->jail.mount);
 811 }
 812
 813 static void
 814 instance_config_move(struct service_instance *in, struct service_instance *in_src)
 815 {
 816         instance_config_cleanup(in);
 817         blobmsg_list_move(&in->env, &in_src->env);
 818         blobmsg_list_move(&in->data, &in_src->data);
 819         blobmsg_list_move(&in->netdev, &in_src->netdev);
 820         blobmsg_list_move(&in->file, &in_src->file);
 821         blobmsg_list_move(&in->limits, &in_src->limits);
 822         blobmsg_list_move(&in->errors, &in_src->errors);
 823         blobmsg_list_move(&in->jail.mount, &in_src->jail.mount);
 824         in->trigger = in_src->trigger;
 825         in->command = in_src->command;
 826         in->name = in_src->name;
 827         in->node.avl.key = in_src->node.avl.key;
 828
 829         free(in->config);
 830         in->config = in_src->config;
 831         in_src->config = NULL;
 832 }
 833
 834 bool
 835 instance_update(struct service_instance *in, struct service_instance *in_new)
 836 {
 837         bool changed = instance_config_changed(in, in_new);
 838         bool running = in->proc.pending;
 839
 840         if (!changed && running)
 841                 return false;
 842
 843         if (!running) {
 844                 if (changed)
 845                         instance_config_move(in, in_new);
 846                 instance_start(in);
 847         } else {
 848                 instance_restart(in);
 849                 instance_config_move(in, in_new);
 850                 /* restart happens in the child callback handler */
 851         }
 852         return true;
 853 }
 854
 855 void
 856 instance_free(struct service_instance *in)
 857 {
 858         instance_free_stdio(in);
 859         uloop_process_delete(&in->proc);
 860         uloop_timeout_cancel(&in->timeout);
 861         trigger_del(in);
 862         watch_del(in);
 863         instance_config_cleanup(in);
 864         free(in->config);
 865         free(in);
 866 }
 867
 868 void
 869 instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
 870 {
 871         config = blob_memdup(config);
 872         in->srv = s;
 873         in->name = blobmsg_name(config);
 874         in->config = config;
 875         in->timeout.cb = instance_timeout;
 876         in->proc.cb = instance_exit;
 877
 878         in->_stdout.fd.fd = -2;
 879         in->_stdout.stream.string_data = true;
 880         in->_stdout.stream.notify_read = instance_stdout;
 881
 882         in->_stderr.fd.fd = -2;
 883         in->_stderr.stream.string_data = true;
 884         in->_stderr.stream.notify_read = instance_stderr;
 885
 886         blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
 887         blobmsg_list_init(&in->file, struct instance_file, node, instance_file_cmp);
 888         blobmsg_list_simple_init(&in->env);
 889         blobmsg_list_simple_init(&in->data);
 890         blobmsg_list_simple_init(&in->limits);
 891         blobmsg_list_simple_init(&in->errors);
 892         blobmsg_list_simple_init(&in->jail.mount);
 893         in->valid = instance_config_parse(in);
 894 }
 895
 896 void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
 897 {
 898         void *i;
 899
 900         if (!in->valid)
 901                 return;
 902
 903         i = blobmsg_open_table(b, in->name);
 904         blobmsg_add_u8(b, "running", in->proc.pending);
 905         if (in->proc.pending)
 906                 blobmsg_add_u32(b, "pid", in->proc.pid);
 907         blobmsg_add_blob(b, in->command);
 908
 909         if (!avl_is_empty(&in->errors.avl)) {
 910                 struct blobmsg_list_node *var;
 911                 void *e = blobmsg_open_array(b, "errors");
 912                 blobmsg_list_for_each(&in->errors, var)
 913                         blobmsg_add_string(b, NULL, blobmsg_data(var->data));
 914                 blobmsg_close_table(b, e);
 915         }
 916
 917         if (!avl_is_empty(&in->env.avl)) {
 918                 struct blobmsg_list_node *var;
 919                 void *e = blobmsg_open_table(b, "env");
 920                 blobmsg_list_for_each(&in->env, var)
 921                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
 922                 blobmsg_close_table(b, e);
 923         }
 924
 925         if (!avl_is_empty(&in->data.avl)) {
 926                 struct blobmsg_list_node *var;
 927                 void *e = blobmsg_open_table(b, "data");
 928                 blobmsg_list_for_each(&in->data, var)
 929                         blobmsg_add_blob(b, var->data);
 930                 blobmsg_close_table(b, e);
 931         }
 932
 933         if (!avl_is_empty(&in->limits.avl)) {
 934                 struct blobmsg_list_node *var;
 935                 void *e = blobmsg_open_table(b, "limits");
 936                 blobmsg_list_for_each(&in->limits, var)
 937                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
 938                 blobmsg_close_table(b, e);
 939         }
 940
 941         if (in->respawn) {
 942                 void *r = blobmsg_open_table(b, "respawn");
 943                 blobmsg_add_u32(b, "threshold", in->respawn_threshold);
 944                 blobmsg_add_u32(b, "timeout", in->respawn_timeout);
 945                 blobmsg_add_u32(b, "retry", in->respawn_retry);
 946                 blobmsg_close_table(b, r);
 947         }
 948
 949         if (in->trace)
 950                 blobmsg_add_u8(b, "trace", true);
 951
 952         if (in->no_new_privs)
 953                 blobmsg_add_u8(b, "no_new_privs", true);
 954
 955         if (in->seccomp)
 956                 blobmsg_add_string(b, "seccomp", in->seccomp);
 957
 958         if (in->has_jail) {
 959                 void *r = blobmsg_open_table(b, "jail");
 960                 if (in->jail.name)
 961                         blobmsg_add_string(b, "name", in->jail.name);
 962                 blobmsg_add_u8(b, "procfs", in->jail.procfs);
 963                 blobmsg_add_u8(b, "sysfs", in->jail.sysfs);
 964                 blobmsg_add_u8(b, "ubus", in->jail.ubus);
 965                 blobmsg_add_u8(b, "log", in->jail.log);
 966                 blobmsg_add_u8(b, "ronly", in->jail.ronly);
 967                 blobmsg_close_table(b, r);
 968                 if (!avl_is_empty(&in->jail.mount.avl)) {
 969                         struct blobmsg_list_node *var;
 970                         void *e = blobmsg_open_table(b, "mount");
 971                         blobmsg_list_for_each(&in->jail.mount, var)
 972                                 blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
 973                         blobmsg_close_table(b, e);
 974                 }
 975         }
 976
 977         if (verbose && in->trigger)
 978                 blobmsg_add_blob(b, in->trigger);
 979
 980         blobmsg_close_table(b, i);
 981 }