service/instance.c

   1 /*
   2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #define _GNU_SOURCE
  16 #include <sys/resource.h>
  17 #include <sys/types.h>
  18 #include <sys/socket.h>
  19 #include <sys/stat.h>
  20 #include <net/if.h>
  21 #include <unistd.h>
  22 #include <stdint.h>
  23 #include <stdio.h>
  24 #include <fcntl.h>
  25 #include <pwd.h>
  26 #include <libgen.h>
  27 #include <unistd.h>
  28
  29 #include <libubox/md5.h>
  30
  31 #include "../procd.h"
  32
  33 #include "service.h"
  34 #include "instance.h"
  35
  36
  37 enum {
  38         INSTANCE_ATTR_COMMAND,
  39         INSTANCE_ATTR_ENV,
  40         INSTANCE_ATTR_DATA,
  41         INSTANCE_ATTR_NETDEV,
  42         INSTANCE_ATTR_FILE,
  43         INSTANCE_ATTR_TRIGGER,
  44         INSTANCE_ATTR_RESPAWN,
  45         INSTANCE_ATTR_NICE,
  46         INSTANCE_ATTR_LIMITS,
  47         INSTANCE_ATTR_WATCH,
  48         INSTANCE_ATTR_ERROR,
  49         INSTANCE_ATTR_USER,
  50         INSTANCE_ATTR_STDOUT,
  51         INSTANCE_ATTR_STDERR,
  52         INSTANCE_ATTR_NO_NEW_PRIVS,
  53         INSTANCE_ATTR_JAIL,
  54         INSTANCE_ATTR_TRACE,
  55         INSTANCE_ATTR_SECCOMP,
  56         INSTANCE_ATTR_PIDFILE,
  57         INSTANCE_ATTR_RELOADSIG,
  58         __INSTANCE_ATTR_MAX
  59 };
  60
  61 static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = {
  62         [INSTANCE_ATTR_COMMAND] = { "command", BLOBMSG_TYPE_ARRAY },
  63         [INSTANCE_ATTR_ENV] = { "env", BLOBMSG_TYPE_TABLE },
  64         [INSTANCE_ATTR_DATA] = { "data", BLOBMSG_TYPE_TABLE },
  65         [INSTANCE_ATTR_NETDEV] = { "netdev", BLOBMSG_TYPE_ARRAY },
  66         [INSTANCE_ATTR_FILE] = { "file", BLOBMSG_TYPE_ARRAY },
  67         [INSTANCE_ATTR_TRIGGER] = { "triggers", BLOBMSG_TYPE_ARRAY },
  68         [INSTANCE_ATTR_RESPAWN] = { "respawn", BLOBMSG_TYPE_ARRAY },
  69         [INSTANCE_ATTR_NICE] = { "nice", BLOBMSG_TYPE_INT32 },
  70         [INSTANCE_ATTR_LIMITS] = { "limits", BLOBMSG_TYPE_TABLE },
  71         [INSTANCE_ATTR_WATCH] = { "watch", BLOBMSG_TYPE_ARRAY },
  72         [INSTANCE_ATTR_ERROR] = { "error", BLOBMSG_TYPE_ARRAY },
  73         [INSTANCE_ATTR_USER] = { "user", BLOBMSG_TYPE_STRING },
  74         [INSTANCE_ATTR_STDOUT] = { "stdout", BLOBMSG_TYPE_BOOL },
  75         [INSTANCE_ATTR_STDERR] = { "stderr", BLOBMSG_TYPE_BOOL },
  76         [INSTANCE_ATTR_NO_NEW_PRIVS] = { "no_new_privs", BLOBMSG_TYPE_BOOL },
  77         [INSTANCE_ATTR_JAIL] = { "jail", BLOBMSG_TYPE_TABLE },
  78         [INSTANCE_ATTR_TRACE] = { "trace", BLOBMSG_TYPE_BOOL },
  79         [INSTANCE_ATTR_SECCOMP] = { "seccomp", BLOBMSG_TYPE_STRING },
  80         [INSTANCE_ATTR_PIDFILE] = { "pidfile", BLOBMSG_TYPE_STRING },
  81         [INSTANCE_ATTR_RELOADSIG] = { "reload_signal", BLOBMSG_TYPE_INT32 },
  82 };
  83
  84 enum {
  85         JAIL_ATTR_NAME,
  86         JAIL_ATTR_HOSTNAME,
  87         JAIL_ATTR_PROCFS,
  88         JAIL_ATTR_SYSFS,
  89         JAIL_ATTR_UBUS,
  90         JAIL_ATTR_LOG,
  91         JAIL_ATTR_RONLY,
  92         JAIL_ATTR_MOUNT,
  93         __JAIL_ATTR_MAX,
  94 };
  95
  96 static const struct blobmsg_policy jail_attr[__JAIL_ATTR_MAX] = {
  97         [JAIL_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
  98         [JAIL_ATTR_HOSTNAME] = { "hostname", BLOBMSG_TYPE_STRING },
  99         [JAIL_ATTR_PROCFS] = { "procfs", BLOBMSG_TYPE_BOOL },
 100         [JAIL_ATTR_SYSFS] = { "sysfs", BLOBMSG_TYPE_BOOL },
 101         [JAIL_ATTR_UBUS] = { "ubus", BLOBMSG_TYPE_BOOL },
 102         [JAIL_ATTR_LOG] = { "log", BLOBMSG_TYPE_BOOL },
 103         [JAIL_ATTR_RONLY] = { "ronly", BLOBMSG_TYPE_BOOL },
 104         [JAIL_ATTR_MOUNT] = { "mount", BLOBMSG_TYPE_TABLE },
 105 };
 106
 107 struct instance_netdev {
 108         struct blobmsg_list_node node;
 109         int ifindex;
 110 };
 111
 112 struct instance_file {
 113         struct blobmsg_list_node node;
 114         uint32_t md5[4];
 115 };
 116
 117 struct rlimit_name {
 118         const char *name;
 119         int resource;
 120 };
 121
 122 static const struct rlimit_name rlimit_names[] = {
 123         { "as", RLIMIT_AS },
 124         { "core", RLIMIT_CORE },
 125         { "cpu", RLIMIT_CPU },
 126         { "data", RLIMIT_DATA },
 127         { "fsize", RLIMIT_FSIZE },
 128         { "memlock", RLIMIT_MEMLOCK },
 129         { "nofile", RLIMIT_NOFILE },
 130         { "nproc", RLIMIT_NPROC },
 131         { "rss", RLIMIT_RSS },
 132         { "stack", RLIMIT_STACK },
 133 #ifdef linux
 134         { "nice", RLIMIT_NICE },
 135         { "rtprio", RLIMIT_RTPRIO },
 136         { "msgqueue", RLIMIT_MSGQUEUE },
 137         { "sigpending", RLIMIT_SIGPENDING },
 138 #endif
 139         { NULL, 0 }
 140 };
 141
 142 static char trace[] = "/sbin/utrace";
 143
 144 static void closefd(int fd)
 145 {
 146         if (fd > STDERR_FILENO)
 147                 close(fd);
 148 }
 149
 150 static void
 151 instance_limits(const char *limit, const char *value)
 152 {
 153         int i;
 154         struct rlimit rlim;
 155         unsigned long cur, max;
 156
 157         for (i = 0; rlimit_names[i].name != NULL; i++) {
 158                 if (strcmp(rlimit_names[i].name, limit))
 159                         continue;
 160                 if (!strcmp(value, "unlimited")) {
 161                         rlim.rlim_cur = RLIM_INFINITY;
 162                         rlim.rlim_max = RLIM_INFINITY;
 163                 } else {
 164                         if (getrlimit(rlimit_names[i].resource, &rlim))
 165                                 return;
 166
 167                         cur = rlim.rlim_cur;
 168                         max = rlim.rlim_max;
 169
 170                         if (sscanf(value, "%lu %lu", &cur, &max) < 1)
 171                                 return;
 172
 173                         rlim.rlim_cur = cur;
 174                         rlim.rlim_max = max;
 175                 }
 176
 177                 setrlimit(rlimit_names[i].resource, &rlim);
 178                 return;
 179         }
 180 }
 181
 182 static inline int
 183 jail_run(struct service_instance *in, char **argv)
 184 {
 185         struct blobmsg_list_node *var;
 186         struct jail *jail = &in->jail;
 187         int argc = 0;
 188
 189         argv[argc++] = "/sbin/ujail";
 190
 191         if (jail->name) {
 192                 argv[argc++] = "-n";
 193                 argv[argc++] = jail->name;
 194         }
 195
 196         if (jail->hostname) {
 197                 argv[argc++] = "-h";
 198                 argv[argc++] = jail->hostname;
 199         }
 200
 201         if (in->seccomp) {
 202                 argv[argc++] = "-S";
 203                 argv[argc++] = in->seccomp;
 204         }
 205
 206         if (in->no_new_privs)
 207                 argv[argc++] = "-c";
 208
 209         if (jail->procfs)
 210                 argv[argc++] = "-p";
 211
 212         if (jail->sysfs)
 213                 argv[argc++] = "-s";
 214
 215         if (jail->ubus)
 216                 argv[argc++] = "-u";
 217
 218         if (jail->log)
 219                 argv[argc++] = "-l";
 220
 221         if (jail->ronly)
 222                 argv[argc++] = "-o";
 223
 224         blobmsg_list_for_each(&jail->mount, var) {
 225                 const char *type = blobmsg_data(var->data);
 226
 227                 if (*type == '1')
 228                         argv[argc++] = "-w";
 229                 else
 230                         argv[argc++] = "-r";
 231                 argv[argc++] = (char *) blobmsg_name(var->data);
 232         }
 233
 234         argv[argc++] = "--";
 235
 236         return argc;
 237 }
 238
 239 static int
 240 instance_removepid(struct service_instance *in) {
 241         if (!in->pidfile)
 242                 return 0;
 243         if (unlink(in->pidfile)) {
 244                 ERROR("Failed to removed pidfile: %s: %d - %s\n",
 245                         in->pidfile, errno, strerror(errno));
 246                 return 1;
 247         }
 248         return 0;
 249 }
 250
 251 static int
 252 instance_writepid(struct service_instance *in)
 253 {
 254         FILE *_pidfile;
 255
 256         if (!in->pidfile) {
 257                 return 0;
 258         }
 259         _pidfile = fopen(in->pidfile, "w");
 260         if (_pidfile == NULL) {
 261                 ERROR("failed to open pidfile for writing: %s: %d (%s)",
 262                         in->pidfile, errno, strerror(errno));
 263                 return 1;
 264         }
 265         if (fprintf(_pidfile, "%d\n", in->proc.pid) < 0) {
 266                 ERROR("failed to write pidfile: %s: %d (%s)",
 267                         in->pidfile, errno, strerror(errno));
 268                 fclose(_pidfile);
 269                 return 2;
 270         }
 271         if (fclose(_pidfile)) {
 272                 ERROR("failed to close pidfile: %s: %d (%s)",
 273                         in->pidfile, errno, strerror(errno));
 274                 return 3;
 275         }
 276
 277         return 0;
 278 }
 279
 280 static void
 281 instance_run(struct service_instance *in, int _stdout, int _stderr)
 282 {
 283         struct blobmsg_list_node *var;
 284         struct blob_attr *cur;
 285         char **argv;
 286         char *ld_preload;
 287         int argc = 1; /* NULL terminated */
 288         int rem, _stdin;
 289         bool seccomp = !in->trace && !in->has_jail && in->seccomp;
 290         bool setlbf = _stdout >= 0;
 291
 292         if (in->nice)
 293                 setpriority(PRIO_PROCESS, 0, in->nice);
 294
 295         blobmsg_for_each_attr(cur, in->command, rem)
 296                 argc++;
 297
 298         blobmsg_list_for_each(&in->env, var)
 299                 setenv(blobmsg_name(var->data), blobmsg_data(var->data), 1);
 300
 301         if (seccomp)
 302                 setenv("SECCOMP_FILE", in->seccomp, 1);
 303
 304         if ((seccomp || setlbf) && asprintf(&ld_preload, "LD_PRELOAD=%s%s%s",
 305                         seccomp ? "/lib/libpreload-seccomp.so" : "",
 306                         seccomp && setlbf ? ":" : "",
 307                         setlbf ? "/lib/libsetlbf.so" : "") > 0)
 308                 putenv(ld_preload);
 309
 310         blobmsg_list_for_each(&in->limits, var)
 311                 instance_limits(blobmsg_name(var->data), blobmsg_data(var->data));
 312
 313         if (in->trace)
 314                 argc += 1;
 315
 316         argv = alloca(sizeof(char *) * (argc + in->jail.argc));
 317         argc = 0;
 318
 319         if (in->trace)
 320                 argv[argc++] = trace;
 321
 322         if (in->has_jail)
 323                 argc = jail_run(in, argv);
 324
 325         blobmsg_for_each_attr(cur, in->command, rem)
 326                 argv[argc++] = blobmsg_data(cur);
 327
 328         argv[argc] = NULL;
 329
 330         _stdin = open("/dev/null", O_RDONLY);
 331
 332         if (_stdout == -1)
 333                 _stdout = open("/dev/null", O_WRONLY);
 334
 335         if (_stderr == -1)
 336                 _stderr = open("/dev/null", O_WRONLY);
 337
 338         if (_stdin > -1) {
 339                 dup2(_stdin, STDIN_FILENO);
 340                 closefd(_stdin);
 341         }
 342         if (_stdout > -1) {
 343                 dup2(_stdout, STDOUT_FILENO);
 344                 closefd(_stdout);
 345         }
 346         if (_stderr > -1) {
 347                 dup2(_stderr, STDERR_FILENO);
 348                 closefd(_stderr);
 349         }
 350
 351         if (in->gid && setgid(in->gid)) {
 352                 ERROR("failed to set group id %d: %d (%s)\n", in->gid, errno, strerror(errno));
 353                 exit(127);
 354         }
 355         if (in->uid && setuid(in->uid)) {
 356                 ERROR("failed to set user id %d: %d (%s)\n", in->uid, errno, strerror(errno));
 357                 exit(127);
 358         }
 359
 360         execvp(argv[0], argv);
 361         exit(127);
 362 }
 363
 364 static void
 365 instance_free_stdio(struct service_instance *in)
 366 {
 367         if (in->_stdout.fd.fd > -1) {
 368                 ustream_free(&in->_stdout.stream);
 369                 close(in->_stdout.fd.fd);
 370                 in->_stdout.fd.fd = -1;
 371         }
 372
 373         if (in->_stderr.fd.fd > -1) {
 374                 ustream_free(&in->_stderr.stream);
 375                 close(in->_stderr.fd.fd);
 376                 in->_stderr.fd.fd = -1;
 377         }
 378 }
 379
 380 void
 381 instance_start(struct service_instance *in)
 382 {
 383         int pid;
 384         int opipe[2] = { -1, -1 };
 385         int epipe[2] = { -1, -1 };
 386
 387         if (!avl_is_empty(&in->errors.avl)) {
 388                 LOG("Not starting instance %s::%s, an error was indicated\n", in->srv->name, in->name);
 389                 return;
 390         }
 391
 392         if (in->proc.pending || !in->command)
 393                 return;
 394
 395         instance_free_stdio(in);
 396         if (in->_stdout.fd.fd > -2) {
 397                 if (pipe(opipe)) {
 398                         ULOG_WARN("pipe() failed: %d (%s)\n", errno, strerror(errno));
 399                         opipe[0] = opipe[1] = -1;
 400                 }
 401         }
 402
 403         if (in->_stderr.fd.fd > -2) {
 404                 if (pipe(epipe)) {
 405                         ULOG_WARN("pipe() failed: %d (%s)\n", errno, strerror(errno));
 406                         epipe[0] = epipe[1] = -1;
 407                 }
 408         }
 409
 410         in->restart = false;
 411         in->halt = !in->respawn;
 412
 413         if (!in->valid)
 414                 return;
 415
 416         pid = fork();
 417         if (pid < 0)
 418                 return;
 419
 420         if (!pid) {
 421                 uloop_done();
 422                 closefd(opipe[0]);
 423                 closefd(epipe[0]);
 424                 instance_run(in, opipe[1], epipe[1]);
 425                 return;
 426         }
 427
 428         DEBUG(2, "Started instance %s::%s[%d]\n", in->srv->name, in->name, pid);
 429         in->proc.pid = pid;
 430         instance_writepid(in);
 431         clock_gettime(CLOCK_MONOTONIC, &in->start);
 432         uloop_process_add(&in->proc);
 433
 434         if (opipe[0] > -1) {
 435                 ustream_fd_init(&in->_stdout, opipe[0]);
 436                 closefd(opipe[1]);
 437         }
 438
 439         if (epipe[0] > -1) {
 440                 ustream_fd_init(&in->_stderr, epipe[0]);
 441                 closefd(epipe[1]);
 442         }
 443
 444         service_event("instance.start", in->srv->name, in->name);
 445 }
 446
 447 static void
 448 instance_stdio(struct ustream *s, int prio, struct service_instance *in)
 449 {
 450         char *newline, *str, *arg0, ident[32];
 451         int len;
 452
 453         arg0 = basename(blobmsg_data(blobmsg_data(in->command)));
 454         snprintf(ident, sizeof(ident), "%s[%d]", arg0, in->proc.pid);
 455         ulog_open(ULOG_SYSLOG, LOG_DAEMON, ident);
 456
 457         do {
 458                 str = ustream_get_read_buf(s, NULL);
 459                 if (!str)
 460                         break;
 461
 462                 newline = strchr(str, '\n');
 463                 if (!newline)
 464                         break;
 465
 466                 *newline = 0;
 467                 ulog(prio, "%s\n", str);
 468
 469                 len = newline + 1 - str;
 470                 ustream_consume(s, len);
 471         } while (1);
 472
 473         ulog_open(ULOG_SYSLOG, LOG_DAEMON, "procd");
 474 }
 475
 476 static void
 477 instance_stdout(struct ustream *s, int bytes)
 478 {
 479         instance_stdio(s, LOG_INFO,
 480                        container_of(s, struct service_instance, _stdout.stream));
 481 }
 482
 483 static void
 484 instance_stderr(struct ustream *s, int bytes)
 485 {
 486         instance_stdio(s, LOG_ERR,
 487                        container_of(s, struct service_instance, _stderr.stream));
 488 }
 489
 490 static void
 491 instance_timeout(struct uloop_timeout *t)
 492 {
 493         struct service_instance *in;
 494
 495         in = container_of(t, struct service_instance, timeout);
 496
 497         if (!in->halt && (in->restart || in->respawn))
 498                 instance_start(in);
 499 }
 500
 501 static void
 502 instance_exit(struct uloop_process *p, int ret)
 503 {
 504         struct service_instance *in;
 505         struct timespec tp;
 506         long runtime;
 507
 508         in = container_of(p, struct service_instance, proc);
 509
 510         clock_gettime(CLOCK_MONOTONIC, &tp);
 511         runtime = tp.tv_sec - in->start.tv_sec;
 512
 513         DEBUG(2, "Instance %s::%s exit with error code %d after %ld seconds\n", in->srv->name, in->name, ret, runtime);
 514         if (upgrade_running)
 515                 return;
 516
 517         uloop_timeout_cancel(&in->timeout);
 518         if (in->halt) {
 519                 instance_removepid(in);
 520         } else if (in->restart) {
 521                 instance_start(in);
 522         } else if (in->respawn) {
 523                 if (runtime < in->respawn_threshold)
 524                         in->respawn_count++;
 525                 else
 526                         in->respawn_count = 0;
 527                 if (in->respawn_count > in->respawn_retry && in->respawn_retry > 0 ) {
 528                         LOG("Instance %s::%s s in a crash loop %d crashes, %ld seconds since last crash\n",
 529                                                                 in->srv->name, in->name, in->respawn_count, runtime);
 530                         in->restart = in->respawn = 0;
 531                         in->halt = 1;
 532                         service_event("instance.fail", in->srv->name, in->name);
 533                 } else {
 534                         service_event("instance.respawn", in->srv->name, in->name);
 535                         uloop_timeout_set(&in->timeout, in->respawn_timeout * 1000);
 536                 }
 537         }
 538         service_event("instance.stop", in->srv->name, in->name);
 539 }
 540
 541 void
 542 instance_stop(struct service_instance *in)
 543 {
 544         if (!in->proc.pending)
 545                 return;
 546         in->halt = true;
 547         in->restart = in->respawn = false;
 548         kill(in->proc.pid, SIGTERM);
 549 }
 550
 551 static void
 552 instance_restart(struct service_instance *in)
 553 {
 554         if (!in->proc.pending)
 555                 return;
 556
 557         if (in->reload_signal) {
 558                 kill(in->proc.pid, in->reload_signal);
 559                 return;
 560         }
 561
 562         in->halt = false;
 563         in->restart = true;
 564         kill(in->proc.pid, SIGTERM);
 565         instance_removepid(in);
 566 }
 567
 568 static bool
 569 instance_config_changed(struct service_instance *in, struct service_instance *in_new)
 570 {
 571         if (!in->valid)
 572                 return true;
 573
 574         if (!blob_attr_equal(in->command, in_new->command))
 575                 return true;
 576
 577         if (!blobmsg_list_equal(&in->env, &in_new->env))
 578                 return true;
 579
 580         if (!blobmsg_list_equal(&in->netdev, &in_new->netdev))
 581                 return true;
 582
 583         if (!blobmsg_list_equal(&in->file, &in_new->file))
 584                 return true;
 585
 586         if (in->nice != in_new->nice)
 587                 return true;
 588
 589         if (in->uid != in_new->uid)
 590                 return true;
 591
 592         if (in->gid != in_new->gid)
 593                 return true;
 594
 595         if (in->pidfile && in_new->pidfile)
 596                 if (strcmp(in->pidfile, in_new->pidfile))
 597                         return true;
 598
 599         if (in->pidfile && !in_new->pidfile)
 600                 return true;
 601
 602         if (!in->pidfile && in_new->pidfile)
 603                 return true;
 604
 605         if (!blobmsg_list_equal(&in->limits, &in_new->limits))
 606                 return true;
 607
 608         if (!blobmsg_list_equal(&in->jail.mount, &in_new->jail.mount))
 609                 return true;
 610
 611         if (!blobmsg_list_equal(&in->errors, &in_new->errors))
 612                 return true;
 613
 614         return false;
 615 }
 616
 617 static bool
 618 instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 619 {
 620         struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
 621         struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
 622
 623         return n1->ifindex == n2->ifindex;
 624 }
 625
 626 static void
 627 instance_netdev_update(struct blobmsg_list_node *l)
 628 {
 629         struct instance_netdev *n = container_of(l, struct instance_netdev, node);
 630
 631         n->ifindex = if_nametoindex(n->node.avl.key);
 632 }
 633
 634 static bool
 635 instance_file_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 636 {
 637         struct instance_file *f1 = container_of(l1, struct instance_file, node);
 638         struct instance_file *f2 = container_of(l2, struct instance_file, node);
 639
 640         return !memcmp(f1->md5, f2->md5, sizeof(f1->md5));
 641 }
 642
 643 static void
 644 instance_file_update(struct blobmsg_list_node *l)
 645 {
 646         struct instance_file *f = container_of(l, struct instance_file, node);
 647         md5_ctx_t md5;
 648         char buf[256];
 649         int len, fd;
 650
 651         memset(f->md5, 0, sizeof(f->md5));
 652
 653         fd = open(l->avl.key, O_RDONLY);
 654         if (fd < 0)
 655                 return;
 656
 657         md5_begin(&md5);
 658         do {
 659                 len = read(fd, buf, sizeof(buf));
 660                 if (len < 0) {
 661                         if (errno == EINTR)
 662                                 continue;
 663
 664                         break;
 665                 }
 666                 if (!len)
 667                         break;
 668
 669                 md5_hash(buf, len, &md5);
 670         } while(1);
 671
 672         md5_end(f->md5, &md5);
 673         close(fd);
 674 }
 675
 676 static void
 677 instance_fill_any(struct blobmsg_list *l, struct blob_attr *cur)
 678 {
 679         if (!cur)
 680                 return;
 681
 682         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), false);
 683 }
 684
 685 static bool
 686 instance_fill_array(struct blobmsg_list *l, struct blob_attr *cur, blobmsg_update_cb cb, bool array)
 687 {
 688         struct blobmsg_list_node *node;
 689
 690         if (!cur)
 691                 return true;
 692
 693         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 694                 return false;
 695
 696         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), array);
 697         if (cb) {
 698                 blobmsg_list_for_each(l, node)
 699                         cb(node);
 700         }
 701         return true;
 702 }
 703
 704 static int
 705 instance_jail_parse(struct service_instance *in, struct blob_attr *attr)
 706 {
 707         struct blob_attr *tb[__JAIL_ATTR_MAX];
 708         struct jail *jail = &in->jail;
 709         struct stat s;
 710
 711         if (stat("/sbin/ujail", &s))
 712                 return 0;
 713
 714         blobmsg_parse(jail_attr, __JAIL_ATTR_MAX, tb,
 715                 blobmsg_data(attr), blobmsg_data_len(attr));
 716
 717         jail->argc = 2;
 718
 719         if (tb[JAIL_ATTR_NAME]) {
 720                 jail->name = blobmsg_get_string(tb[JAIL_ATTR_NAME]);
 721                 jail->argc += 2;
 722         }
 723         if (tb[JAIL_ATTR_HOSTNAME]) {
 724                 jail->hostname = blobmsg_get_string(tb[JAIL_ATTR_HOSTNAME]);
 725                 jail->argc += 2;
 726         }
 727         if (tb[JAIL_ATTR_PROCFS]) {
 728                 jail->procfs = blobmsg_get_bool(tb[JAIL_ATTR_PROCFS]);
 729                 jail->argc++;
 730         }
 731         if (tb[JAIL_ATTR_SYSFS]) {
 732                 jail->sysfs = blobmsg_get_bool(tb[JAIL_ATTR_SYSFS]);
 733                 jail->argc++;
 734         }
 735         if (tb[JAIL_ATTR_UBUS]) {
 736                 jail->ubus = blobmsg_get_bool(tb[JAIL_ATTR_UBUS]);
 737                 jail->argc++;
 738         }
 739         if (tb[JAIL_ATTR_LOG]) {
 740                 jail->log = blobmsg_get_bool(tb[JAIL_ATTR_LOG]);
 741                 jail->argc++;
 742         }
 743         if (tb[JAIL_ATTR_RONLY]) {
 744                 jail->ronly = blobmsg_get_bool(tb[JAIL_ATTR_RONLY]);
 745                 jail->argc++;
 746         }
 747         if (tb[JAIL_ATTR_MOUNT]) {
 748                 struct blob_attr *cur;
 749                 int rem;
 750
 751                 blobmsg_for_each_attr(cur, tb[JAIL_ATTR_MOUNT], rem)
 752                         jail->argc += 2;
 753                 instance_fill_array(&jail->mount, tb[JAIL_ATTR_MOUNT], NULL, false);
 754         }
 755         if (in->seccomp)
 756                 jail->argc += 2;
 757
 758         return 1;
 759 }
 760
 761 static bool
 762 instance_config_parse_command(struct service_instance *in, struct blob_attr **tb)
 763 {
 764         struct blob_attr *cur, *cur2;
 765         bool ret = false;
 766         int rem;
 767
 768         cur = tb[INSTANCE_ATTR_COMMAND];
 769         if (!cur) {
 770                 in->command = NULL;
 771                 return true;
 772         }
 773
 774         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 775                 return false;
 776
 777         blobmsg_for_each_attr(cur2, cur, rem) {
 778                 ret = true;
 779                 break;
 780         }
 781
 782         in->command = cur;
 783         return ret;
 784 }
 785
 786 static bool
 787 instance_config_parse(struct service_instance *in)
 788 {
 789         struct blob_attr *tb[__INSTANCE_ATTR_MAX];
 790         struct blob_attr *cur, *cur2;
 791         int rem;
 792
 793         blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
 794                 blobmsg_data(in->config), blobmsg_data_len(in->config));
 795
 796         if (!instance_config_parse_command(in, tb))
 797                 return false;
 798
 799         if (tb[INSTANCE_ATTR_RESPAWN]) {
 800                 int i = 0;
 801                 uint32_t vals[3] = { 3600, 5, 5};
 802
 803                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_RESPAWN], rem) {
 804                         if ((i >= 3) && (blobmsg_type(cur2) == BLOBMSG_TYPE_STRING))
 805                                 continue;
 806                         vals[i] = atoi(blobmsg_get_string(cur2));
 807                         i++;
 808                 }
 809                 in->respawn = true;
 810                 in->respawn_count = 0;
 811                 in->respawn_threshold = vals[0];
 812                 in->respawn_timeout = vals[1];
 813                 in->respawn_retry = vals[2];
 814         }
 815         if (tb[INSTANCE_ATTR_TRIGGER]) {
 816                 in->trigger = tb[INSTANCE_ATTR_TRIGGER];
 817                 trigger_add(in->trigger, in);
 818         }
 819
 820         if (tb[INSTANCE_ATTR_WATCH]) {
 821                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_WATCH], rem) {
 822                         if (blobmsg_type(cur2) != BLOBMSG_TYPE_STRING)
 823                                 continue;
 824                         DEBUG(3, "watch for %s\n", blobmsg_get_string(cur2));
 825                         watch_add(blobmsg_get_string(cur2), in);
 826                 }
 827         }
 828
 829         if ((cur = tb[INSTANCE_ATTR_NICE])) {
 830                 in->nice = (int8_t) blobmsg_get_u32(cur);
 831                 if (in->nice < -20 || in->nice > 20)
 832                         return false;
 833         }
 834
 835         if (tb[INSTANCE_ATTR_USER]) {
 836                 struct passwd *p = getpwnam(blobmsg_get_string(tb[INSTANCE_ATTR_USER]));
 837                 if (p) {
 838                         in->uid = p->pw_uid;
 839                         in->gid = p->pw_gid;
 840                 }
 841         }
 842
 843         if (tb[INSTANCE_ATTR_TRACE])
 844                 in->trace = blobmsg_get_bool(tb[INSTANCE_ATTR_TRACE]);
 845
 846         if (tb[INSTANCE_ATTR_NO_NEW_PRIVS])
 847                 in->no_new_privs = blobmsg_get_bool(tb[INSTANCE_ATTR_NO_NEW_PRIVS]);
 848
 849         if (!in->trace && tb[INSTANCE_ATTR_SECCOMP]) {
 850                 char *seccomp = blobmsg_get_string(tb[INSTANCE_ATTR_SECCOMP]);
 851                 struct stat s;
 852
 853                 if (stat(seccomp, &s))
 854                         ERROR("%s: not starting seccomp as %s is missing\n", in->name, seccomp);
 855                 else
 856                         in->seccomp = seccomp;
 857         }
 858
 859         if (tb[INSTANCE_ATTR_PIDFILE]) {
 860                 char *pidfile = blobmsg_get_string(tb[INSTANCE_ATTR_PIDFILE]);
 861                 if (pidfile)
 862                         in->pidfile = pidfile;
 863         }
 864
 865         if (tb[INSTANCE_ATTR_RELOADSIG])
 866                 in->reload_signal = blobmsg_get_u32(tb[INSTANCE_ATTR_RELOADSIG]);
 867
 868         if (!in->trace && tb[INSTANCE_ATTR_JAIL])
 869                 in->has_jail = instance_jail_parse(in, tb[INSTANCE_ATTR_JAIL]);
 870
 871         if (tb[INSTANCE_ATTR_STDOUT] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDOUT]))
 872                 in->_stdout.fd.fd = -1;
 873
 874         if (tb[INSTANCE_ATTR_STDERR] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDERR]))
 875                 in->_stderr.fd.fd = -1;
 876
 877         instance_fill_any(&in->data, tb[INSTANCE_ATTR_DATA]);
 878
 879         if (!instance_fill_array(&in->env, tb[INSTANCE_ATTR_ENV], NULL, false))
 880                 return false;
 881
 882         if (!instance_fill_array(&in->netdev, tb[INSTANCE_ATTR_NETDEV], instance_netdev_update, true))
 883                 return false;
 884
 885         if (!instance_fill_array(&in->file, tb[INSTANCE_ATTR_FILE], instance_file_update, true))
 886                 return false;
 887
 888         if (!instance_fill_array(&in->limits, tb[INSTANCE_ATTR_LIMITS], NULL, false))
 889                 return false;
 890
 891         if (!instance_fill_array(&in->errors, tb[INSTANCE_ATTR_ERROR], NULL, true))
 892                 return false;
 893
 894         return true;
 895 }
 896
 897 static void
 898 instance_config_cleanup(struct service_instance *in)
 899 {
 900         blobmsg_list_free(&in->env);
 901         blobmsg_list_free(&in->data);
 902         blobmsg_list_free(&in->netdev);
 903         blobmsg_list_free(&in->file);
 904         blobmsg_list_free(&in->limits);
 905         blobmsg_list_free(&in->errors);
 906         blobmsg_list_free(&in->jail.mount);
 907 }
 908
 909 static void
 910 instance_config_move(struct service_instance *in, struct service_instance *in_src)
 911 {
 912         instance_config_cleanup(in);
 913         blobmsg_list_move(&in->env, &in_src->env);
 914         blobmsg_list_move(&in->data, &in_src->data);
 915         blobmsg_list_move(&in->netdev, &in_src->netdev);
 916         blobmsg_list_move(&in->file, &in_src->file);
 917         blobmsg_list_move(&in->limits, &in_src->limits);
 918         blobmsg_list_move(&in->errors, &in_src->errors);
 919         blobmsg_list_move(&in->jail.mount, &in_src->jail.mount);
 920         in->trigger = in_src->trigger;
 921         in->command = in_src->command;
 922         in->pidfile = in_src->pidfile;
 923         in->name = in_src->name;
 924         in->node.avl.key = in_src->node.avl.key;
 925
 926         free(in->config);
 927         in->config = in_src->config;
 928         in_src->config = NULL;
 929 }
 930
 931 void
 932 instance_update(struct service_instance *in, struct service_instance *in_new)
 933 {
 934         bool changed = instance_config_changed(in, in_new);
 935         bool running = in->proc.pending;
 936
 937         if (!running) {
 938                 instance_config_move(in, in_new);
 939                 instance_start(in);
 940         } else {
 941                 if (changed)
 942                         instance_restart(in);
 943                 instance_config_move(in, in_new);
 944                 /* restart happens in the child callback handler */
 945         }
 946 }
 947
 948 void
 949 instance_free(struct service_instance *in)
 950 {
 951         instance_free_stdio(in);
 952         uloop_process_delete(&in->proc);
 953         uloop_timeout_cancel(&in->timeout);
 954         trigger_del(in);
 955         watch_del(in);
 956         instance_config_cleanup(in);
 957         free(in->config);
 958         free(in);
 959 }
 960
 961 void
 962 instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
 963 {
 964         config = blob_memdup(config);
 965         in->srv = s;
 966         in->name = blobmsg_name(config);
 967         in->config = config;
 968         in->timeout.cb = instance_timeout;
 969         in->proc.cb = instance_exit;
 970
 971         in->_stdout.fd.fd = -2;
 972         in->_stdout.stream.string_data = true;
 973         in->_stdout.stream.notify_read = instance_stdout;
 974
 975         in->_stderr.fd.fd = -2;
 976         in->_stderr.stream.string_data = true;
 977         in->_stderr.stream.notify_read = instance_stderr;
 978
 979         blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
 980         blobmsg_list_init(&in->file, struct instance_file, node, instance_file_cmp);
 981         blobmsg_list_simple_init(&in->env);
 982         blobmsg_list_simple_init(&in->data);
 983         blobmsg_list_simple_init(&in->limits);
 984         blobmsg_list_simple_init(&in->errors);
 985         blobmsg_list_simple_init(&in->jail.mount);
 986         in->valid = instance_config_parse(in);
 987 }
 988
 989 void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
 990 {
 991         void *i;
 992
 993         if (!in->valid)
 994                 return;
 995
 996         i = blobmsg_open_table(b, in->name);
 997         blobmsg_add_u8(b, "running", in->proc.pending);
 998         if (in->proc.pending)
 999                 blobmsg_add_u32(b, "pid", in->proc.pid);
1000         if (in->command)
1001                 blobmsg_add_blob(b, in->command);
1002
1003         if (!avl_is_empty(&in->errors.avl)) {
1004                 struct blobmsg_list_node *var;
1005                 void *e = blobmsg_open_array(b, "errors");
1006                 blobmsg_list_for_each(&in->errors, var)
1007                         blobmsg_add_string(b, NULL, blobmsg_data(var->data));
1008                 blobmsg_close_table(b, e);
1009         }
1010
1011         if (!avl_is_empty(&in->env.avl)) {
1012                 struct blobmsg_list_node *var;
1013                 void *e = blobmsg_open_table(b, "env");
1014                 blobmsg_list_for_each(&in->env, var)
1015                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1016                 blobmsg_close_table(b, e);
1017         }
1018
1019         if (!avl_is_empty(&in->data.avl)) {
1020                 struct blobmsg_list_node *var;
1021                 void *e = blobmsg_open_table(b, "data");
1022                 blobmsg_list_for_each(&in->data, var)
1023                         blobmsg_add_blob(b, var->data);
1024                 blobmsg_close_table(b, e);
1025         }
1026
1027         if (!avl_is_empty(&in->limits.avl)) {
1028                 struct blobmsg_list_node *var;
1029                 void *e = blobmsg_open_table(b, "limits");
1030                 blobmsg_list_for_each(&in->limits, var)
1031                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1032                 blobmsg_close_table(b, e);
1033         }
1034
1035         if (in->reload_signal)
1036                 blobmsg_add_u32(b, "reload_signal", in->reload_signal);
1037
1038         if (in->respawn) {
1039                 void *r = blobmsg_open_table(b, "respawn");
1040                 blobmsg_add_u32(b, "threshold", in->respawn_threshold);
1041                 blobmsg_add_u32(b, "timeout", in->respawn_timeout);
1042                 blobmsg_add_u32(b, "retry", in->respawn_retry);
1043                 blobmsg_close_table(b, r);
1044         }
1045
1046         if (in->trace)
1047                 blobmsg_add_u8(b, "trace", true);
1048
1049         if (in->no_new_privs)
1050                 blobmsg_add_u8(b, "no_new_privs", true);
1051
1052         if (in->seccomp)
1053                 blobmsg_add_string(b, "seccomp", in->seccomp);
1054
1055         if (in->pidfile)
1056                 blobmsg_add_string(b, "pidfile", in->pidfile);
1057
1058         if (in->has_jail) {
1059                 void *r = blobmsg_open_table(b, "jail");
1060                 if (in->jail.name)
1061                         blobmsg_add_string(b, "name", in->jail.name);
1062                 if (in->jail.hostname)
1063                         blobmsg_add_string(b, "hostname", in->jail.hostname);
1064                 blobmsg_add_u8(b, "procfs", in->jail.procfs);
1065                 blobmsg_add_u8(b, "sysfs", in->jail.sysfs);
1066                 blobmsg_add_u8(b, "ubus", in->jail.ubus);
1067                 blobmsg_add_u8(b, "log", in->jail.log);
1068                 blobmsg_add_u8(b, "ronly", in->jail.ronly);
1069                 blobmsg_close_table(b, r);
1070                 if (!avl_is_empty(&in->jail.mount.avl)) {
1071                         struct blobmsg_list_node *var;
1072                         void *e = blobmsg_open_table(b, "mount");
1073                         blobmsg_list_for_each(&in->jail.mount, var)
1074                                 blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1075                         blobmsg_close_table(b, e);
1076                 }
1077         }
1078
1079         if (verbose && in->trigger)
1080                 blobmsg_add_blob(b, in->trigger);
1081
1082         blobmsg_close_table(b, i);
1083 }