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 <grp.h>
  21 #include <net/if.h>
  22 #include <unistd.h>
  23 #include <stdint.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #include <pwd.h>
  27 #include <libgen.h>
  28 #include <unistd.h>
  29 #define SYSLOG_NAMES
  30 #include <syslog.h>
  31
  32 #include <libubox/md5.h>
  33
  34 #include "../procd.h"
  35
  36 #include "service.h"
  37 #include "instance.h"
  38
  39 #define UJAIL_BIN_PATH "/sbin/ujail"
  40 #define CGROUP_BASEDIR "/sys/fs/cgroup/services"
  41
  42 enum {
  43         INSTANCE_ATTR_COMMAND,
  44         INSTANCE_ATTR_ENV,
  45         INSTANCE_ATTR_DATA,
  46         INSTANCE_ATTR_NETDEV,
  47         INSTANCE_ATTR_FILE,
  48         INSTANCE_ATTR_TRIGGER,
  49         INSTANCE_ATTR_RESPAWN,
  50         INSTANCE_ATTR_NICE,
  51         INSTANCE_ATTR_LIMITS,
  52         INSTANCE_ATTR_WATCH,
  53         INSTANCE_ATTR_ERROR,
  54         INSTANCE_ATTR_USER,
  55         INSTANCE_ATTR_GROUP,
  56         INSTANCE_ATTR_STDOUT,
  57         INSTANCE_ATTR_STDERR,
  58         INSTANCE_ATTR_NO_NEW_PRIVS,
  59         INSTANCE_ATTR_JAIL,
  60         INSTANCE_ATTR_TRACE,
  61         INSTANCE_ATTR_SECCOMP,
  62         INSTANCE_ATTR_PIDFILE,
  63         INSTANCE_ATTR_RELOADSIG,
  64         INSTANCE_ATTR_TERMTIMEOUT,
  65         INSTANCE_ATTR_FACILITY,
  66         INSTANCE_ATTR_EXTROOT,
  67         INSTANCE_ATTR_OVERLAYDIR,
  68         INSTANCE_ATTR_TMPOVERLAYSIZE,
  69         INSTANCE_ATTR_BUNDLE,
  70         INSTANCE_ATTR_WATCHDOG,
  71         __INSTANCE_ATTR_MAX
  72 };
  73
  74 static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = {
  75         [INSTANCE_ATTR_COMMAND] = { "command", BLOBMSG_TYPE_ARRAY },
  76         [INSTANCE_ATTR_ENV] = { "env", BLOBMSG_TYPE_TABLE },
  77         [INSTANCE_ATTR_DATA] = { "data", BLOBMSG_TYPE_TABLE },
  78         [INSTANCE_ATTR_NETDEV] = { "netdev", BLOBMSG_TYPE_ARRAY },
  79         [INSTANCE_ATTR_FILE] = { "file", BLOBMSG_TYPE_ARRAY },
  80         [INSTANCE_ATTR_TRIGGER] = { "triggers", BLOBMSG_TYPE_ARRAY },
  81         [INSTANCE_ATTR_RESPAWN] = { "respawn", BLOBMSG_TYPE_ARRAY },
  82         [INSTANCE_ATTR_NICE] = { "nice", BLOBMSG_TYPE_INT32 },
  83         [INSTANCE_ATTR_LIMITS] = { "limits", BLOBMSG_TYPE_TABLE },
  84         [INSTANCE_ATTR_WATCH] = { "watch", BLOBMSG_TYPE_ARRAY },
  85         [INSTANCE_ATTR_ERROR] = { "error", BLOBMSG_TYPE_ARRAY },
  86         [INSTANCE_ATTR_USER] = { "user", BLOBMSG_TYPE_STRING },
  87         [INSTANCE_ATTR_GROUP] = { "group", BLOBMSG_TYPE_STRING },
  88         [INSTANCE_ATTR_STDOUT] = { "stdout", BLOBMSG_TYPE_BOOL },
  89         [INSTANCE_ATTR_STDERR] = { "stderr", BLOBMSG_TYPE_BOOL },
  90         [INSTANCE_ATTR_NO_NEW_PRIVS] = { "no_new_privs", BLOBMSG_TYPE_BOOL },
  91         [INSTANCE_ATTR_JAIL] = { "jail", BLOBMSG_TYPE_TABLE },
  92         [INSTANCE_ATTR_TRACE] = { "trace", BLOBMSG_TYPE_BOOL },
  93         [INSTANCE_ATTR_SECCOMP] = { "seccomp", BLOBMSG_TYPE_STRING },
  94         [INSTANCE_ATTR_PIDFILE] = { "pidfile", BLOBMSG_TYPE_STRING },
  95         [INSTANCE_ATTR_RELOADSIG] = { "reload_signal", BLOBMSG_TYPE_INT32 },
  96         [INSTANCE_ATTR_TERMTIMEOUT] = { "term_timeout", BLOBMSG_TYPE_INT32 },
  97         [INSTANCE_ATTR_FACILITY] = { "facility", BLOBMSG_TYPE_STRING },
  98         [INSTANCE_ATTR_EXTROOT] = { "extroot", BLOBMSG_TYPE_STRING },
  99         [INSTANCE_ATTR_OVERLAYDIR] = { "overlaydir", BLOBMSG_TYPE_STRING },
 100         [INSTANCE_ATTR_TMPOVERLAYSIZE] = { "tmpoverlaysize", BLOBMSG_TYPE_STRING },
 101         [INSTANCE_ATTR_BUNDLE] = { "bundle", BLOBMSG_TYPE_STRING },
 102         [INSTANCE_ATTR_WATCHDOG] = { "watchdog", BLOBMSG_TYPE_ARRAY },
 103 };
 104
 105 enum {
 106         JAIL_ATTR_NAME,
 107         JAIL_ATTR_HOSTNAME,
 108         JAIL_ATTR_PROCFS,
 109         JAIL_ATTR_SYSFS,
 110         JAIL_ATTR_UBUS,
 111         JAIL_ATTR_LOG,
 112         JAIL_ATTR_RONLY,
 113         JAIL_ATTR_MOUNT,
 114         JAIL_ATTR_NETNS,
 115         JAIL_ATTR_USERNS,
 116         JAIL_ATTR_CGROUPSNS,
 117         JAIL_ATTR_CONSOLE,
 118         JAIL_ATTR_REQUIREJAIL,
 119         JAIL_ATTR_IMMEDIATELY,
 120         __JAIL_ATTR_MAX,
 121 };
 122
 123 static const struct blobmsg_policy jail_attr[__JAIL_ATTR_MAX] = {
 124         [JAIL_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 125         [JAIL_ATTR_HOSTNAME] = { "hostname", BLOBMSG_TYPE_STRING },
 126         [JAIL_ATTR_PROCFS] = { "procfs", BLOBMSG_TYPE_BOOL },
 127         [JAIL_ATTR_SYSFS] = { "sysfs", BLOBMSG_TYPE_BOOL },
 128         [JAIL_ATTR_UBUS] = { "ubus", BLOBMSG_TYPE_BOOL },
 129         [JAIL_ATTR_LOG] = { "log", BLOBMSG_TYPE_BOOL },
 130         [JAIL_ATTR_RONLY] = { "ronly", BLOBMSG_TYPE_BOOL },
 131         [JAIL_ATTR_MOUNT] = { "mount", BLOBMSG_TYPE_TABLE },
 132         [JAIL_ATTR_NETNS] = { "netns", BLOBMSG_TYPE_BOOL },
 133         [JAIL_ATTR_USERNS] = { "userns", BLOBMSG_TYPE_BOOL },
 134         [JAIL_ATTR_CGROUPSNS] = { "cgroupsns", BLOBMSG_TYPE_BOOL },
 135         [JAIL_ATTR_CONSOLE] = { "console", BLOBMSG_TYPE_BOOL },
 136         [JAIL_ATTR_REQUIREJAIL] = { "requirejail", BLOBMSG_TYPE_BOOL },
 137         [JAIL_ATTR_IMMEDIATELY] = { "immediately", BLOBMSG_TYPE_BOOL },
 138 };
 139
 140 struct instance_netdev {
 141         struct blobmsg_list_node node;
 142         int ifindex;
 143 };
 144
 145 struct instance_file {
 146         struct blobmsg_list_node node;
 147         uint32_t md5[4];
 148 };
 149
 150 struct rlimit_name {
 151         const char *name;
 152         int resource;
 153 };
 154
 155 static const struct rlimit_name rlimit_names[] = {
 156         { "as", RLIMIT_AS },
 157         { "core", RLIMIT_CORE },
 158         { "cpu", RLIMIT_CPU },
 159         { "data", RLIMIT_DATA },
 160         { "fsize", RLIMIT_FSIZE },
 161         { "memlock", RLIMIT_MEMLOCK },
 162         { "nofile", RLIMIT_NOFILE },
 163         { "nproc", RLIMIT_NPROC },
 164         { "rss", RLIMIT_RSS },
 165         { "stack", RLIMIT_STACK },
 166 #ifdef linux
 167         { "nice", RLIMIT_NICE },
 168         { "rtprio", RLIMIT_RTPRIO },
 169         { "msgqueue", RLIMIT_MSGQUEUE },
 170         { "sigpending", RLIMIT_SIGPENDING },
 171 #endif
 172         { NULL, 0 }
 173 };
 174
 175 static void closefd(int fd)
 176 {
 177         if (fd > STDERR_FILENO)
 178                 close(fd);
 179 }
 180
 181 /* convert a string into numeric syslog facility or return -1 if no match found */
 182 static int
 183 syslog_facility_str_to_int(const char *facility)
 184 {
 185         CODE *p = facilitynames;
 186
 187         while (p->c_name && strcasecmp(p->c_name, facility))
 188                 p++;
 189
 190         return p->c_val;
 191 }
 192
 193 static void
 194 instance_limits(const char *limit, const char *value)
 195 {
 196         int i;
 197         struct rlimit rlim;
 198         unsigned long cur, max;
 199
 200         for (i = 0; rlimit_names[i].name != NULL; i++) {
 201                 if (strcmp(rlimit_names[i].name, limit))
 202                         continue;
 203                 if (!strcmp(value, "unlimited")) {
 204                         rlim.rlim_cur = RLIM_INFINITY;
 205                         rlim.rlim_max = RLIM_INFINITY;
 206                 } else {
 207                         if (getrlimit(rlimit_names[i].resource, &rlim))
 208                                 return;
 209
 210                         cur = rlim.rlim_cur;
 211                         max = rlim.rlim_max;
 212
 213                         if (sscanf(value, "%lu %lu", &cur, &max) < 1)
 214                                 return;
 215
 216                         rlim.rlim_cur = cur;
 217                         rlim.rlim_max = max;
 218                 }
 219
 220                 setrlimit(rlimit_names[i].resource, &rlim);
 221                 return;
 222         }
 223 }
 224
 225 static inline int
 226 jail_run(struct service_instance *in, char **argv)
 227 {
 228         struct blobmsg_list_node *var;
 229         struct jail *jail = &in->jail;
 230         int argc = 0;
 231
 232         argv[argc++] = UJAIL_BIN_PATH;
 233
 234         if (jail->name) {
 235                 argv[argc++] = "-n";
 236                 argv[argc++] = jail->name;
 237         }
 238
 239         if (jail->hostname) {
 240                 argv[argc++] = "-h";
 241                 argv[argc++] = jail->hostname;
 242         }
 243
 244         if (in->seccomp) {
 245                 argv[argc++] = "-S";
 246                 argv[argc++] = in->seccomp;
 247         }
 248
 249         if (in->user) {
 250                 argv[argc++] = "-U";
 251                 argv[argc++] = in->user;
 252         }
 253
 254         if (in->group) {
 255                 argv[argc++] = "-G";
 256                 argv[argc++] = in->group;
 257         }
 258
 259         if (in->no_new_privs)
 260                 argv[argc++] = "-c";
 261
 262         if (jail->procfs)
 263                 argv[argc++] = "-p";
 264
 265         if (jail->sysfs)
 266                 argv[argc++] = "-s";
 267
 268         if (jail->ubus)
 269                 argv[argc++] = "-u";
 270
 271         if (jail->log)
 272                 argv[argc++] = "-l";
 273
 274         if (jail->ronly)
 275                 argv[argc++] = "-o";
 276
 277         if (jail->netns)
 278                 argv[argc++] = "-N";
 279
 280         if (jail->userns)
 281                 argv[argc++] = "-f";
 282
 283         if (jail->cgroupsns)
 284                 argv[argc++] = "-F";
 285
 286         if (jail->console)
 287                 argv[argc++] = "-y";
 288
 289         if (in->extroot) {
 290                 argv[argc++] = "-R";
 291                 argv[argc++] = in->extroot;
 292         }
 293
 294         if (in->overlaydir) {
 295                 argv[argc++] = "-O";
 296                 argv[argc++] = in->overlaydir;
 297         }
 298
 299         if (in->tmpoverlaysize) {
 300                 argv[argc++] = "-T";
 301                 argv[argc++] = in->tmpoverlaysize;
 302         }
 303
 304         if (in->immediately)
 305                 argv[argc++] = "-i";
 306
 307         if (in->bundle) {
 308                 argv[argc++] = "-J";
 309                 argv[argc++] = in->bundle;
 310         }
 311
 312         if (in->require_jail)
 313                 argv[argc++] = "-E";
 314
 315         blobmsg_list_for_each(&jail->mount, var) {
 316                 const char *type = blobmsg_data(var->data);
 317
 318                 if (*type == '1')
 319                         argv[argc++] = "-w";
 320                 else
 321                         argv[argc++] = "-r";
 322                 argv[argc++] = (char *) blobmsg_name(var->data);
 323         }
 324
 325         argv[argc++] = "--";
 326
 327         return argc;
 328 }
 329
 330 static int
 331 instance_removepid(struct service_instance *in) {
 332         if (!in->pidfile)
 333                 return 0;
 334         if (unlink(in->pidfile)) {
 335                 ERROR("Failed to remove pidfile: %s: %m\n", in->pidfile);
 336                 return 1;
 337         }
 338         return 0;
 339 }
 340
 341 static int
 342 instance_writepid(struct service_instance *in)
 343 {
 344         FILE *_pidfile;
 345
 346         if (!in->pidfile) {
 347                 return 0;
 348         }
 349         _pidfile = fopen(in->pidfile, "w");
 350         if (_pidfile == NULL) {
 351                 ERROR("failed to open pidfile for writing: %s: %m", in->pidfile);
 352                 return 1;
 353         }
 354         if (fprintf(_pidfile, "%d\n", in->proc.pid) < 0) {
 355                 ERROR("failed to write pidfile: %s: %m", in->pidfile);
 356                 fclose(_pidfile);
 357                 return 2;
 358         }
 359         if (fclose(_pidfile)) {
 360                 ERROR("failed to close pidfile: %s: %m", in->pidfile);
 361                 return 3;
 362         }
 363
 364         return 0;
 365 }
 366
 367 static void
 368 instance_run(struct service_instance *in, int _stdout, int _stderr)
 369 {
 370         struct blobmsg_list_node *var;
 371         struct blob_attr *cur;
 372         char **argv;
 373         int argc = 1; /* NULL terminated */
 374         int rem, _stdin;
 375         bool seccomp = !in->trace && !in->has_jail && in->seccomp;
 376         bool setlbf = _stdout >= 0;
 377
 378         if (in->nice)
 379                 setpriority(PRIO_PROCESS, 0, in->nice);
 380
 381         blobmsg_for_each_attr(cur, in->command, rem)
 382                 argc++;
 383
 384         blobmsg_list_for_each(&in->env, var)
 385                 setenv(blobmsg_name(var->data), blobmsg_data(var->data), 1);
 386
 387         if (seccomp)
 388                 setenv("SECCOMP_FILE", in->seccomp, 1);
 389
 390         if (setlbf)
 391                 setenv("LD_PRELOAD", "/lib/libsetlbf.so", 1);
 392
 393         blobmsg_list_for_each(&in->limits, var)
 394                 instance_limits(blobmsg_name(var->data), blobmsg_data(var->data));
 395
 396         if (in->trace || seccomp)
 397                 argc += 1;
 398
 399         argv = alloca(sizeof(char *) * (argc + in->jail.argc));
 400         argc = 0;
 401
 402 #ifdef SECCOMP_SUPPORT
 403         if (in->trace)
 404                 argv[argc++] = "/sbin/utrace";
 405         else if (seccomp)
 406                 argv[argc++] = "/sbin/seccomp-trace";
 407 #else
 408         if (in->trace || seccomp)
 409                 ULOG_WARN("Seccomp support for %s::%s not available\n", in->srv->name, in->name);
 410 #endif
 411
 412         if (in->has_jail) {
 413                 argc = jail_run(in, argv);
 414                 if (argc != in->jail.argc)
 415                         ULOG_WARN("expected %i jail params, used %i for %s::%s\n",
 416                                 in->jail.argc, argc, in->srv->name, in->name);
 417         }
 418
 419         blobmsg_for_each_attr(cur, in->command, rem)
 420                 argv[argc++] = blobmsg_data(cur);
 421
 422         argv[argc] = NULL;
 423
 424         _stdin = open("/dev/null", O_RDONLY);
 425
 426         if (_stdout == -1)
 427                 _stdout = open("/dev/null", O_WRONLY);
 428
 429         if (_stderr == -1)
 430                 _stderr = open("/dev/null", O_WRONLY);
 431
 432         if (_stdin > -1) {
 433                 dup2(_stdin, STDIN_FILENO);
 434                 closefd(_stdin);
 435         }
 436         if (_stdout > -1) {
 437                 dup2(_stdout, STDOUT_FILENO);
 438                 closefd(_stdout);
 439         }
 440         if (_stderr > -1) {
 441                 dup2(_stderr, STDERR_FILENO);
 442                 closefd(_stderr);
 443         }
 444
 445         if (!in->has_jail && in->user && in->pw_gid && initgroups(in->user, in->pw_gid)) {
 446                 ERROR("failed to initgroups() for user %s: %m\n", in->user);
 447                 exit(127);
 448         }
 449         if (!in->has_jail && in->gr_gid && setgid(in->gr_gid)) {
 450                 ERROR("failed to set group id %d: %m\n", in->gr_gid);
 451                 exit(127);
 452         }
 453         if (!in->has_jail && in->uid && setuid(in->uid)) {
 454                 ERROR("failed to set user id %d: %m\n", in->uid);
 455                 exit(127);
 456         }
 457
 458         execvp(argv[0], argv);
 459         exit(127);
 460 }
 461
 462 static void
 463 instance_add_cgroup(const char *service, const char *instance)
 464 {
 465         struct stat sb;
 466         char cgnamebuf[256];
 467         int fd;
 468
 469         if (stat("/sys/fs/cgroup/cgroup.subtree_control", &sb))
 470                 return;
 471
 472         mkdir(CGROUP_BASEDIR, 0700);
 473
 474         snprintf(cgnamebuf, sizeof(cgnamebuf), "%s/%s", CGROUP_BASEDIR, service);
 475         mkdir(cgnamebuf, 0700);
 476         snprintf(cgnamebuf, sizeof(cgnamebuf), "%s/%s/%s", CGROUP_BASEDIR, service, instance);
 477         mkdir(cgnamebuf, 0700);
 478         strcat(cgnamebuf, "/cgroup.procs");
 479
 480         fd = open(cgnamebuf, O_WRONLY);
 481         if (fd == -1)
 482                 return;
 483
 484         dprintf(fd, "%d", getpid());
 485         close(fd);
 486 }
 487
 488 static void
 489 instance_free_stdio(struct service_instance *in)
 490 {
 491         if (in->_stdout.fd.fd > -1) {
 492                 ustream_free(&in->_stdout.stream);
 493                 close(in->_stdout.fd.fd);
 494                 in->_stdout.fd.fd = -1;
 495         }
 496
 497         if (in->_stderr.fd.fd > -1) {
 498                 ustream_free(&in->_stderr.stream);
 499                 close(in->_stderr.fd.fd);
 500                 in->_stderr.fd.fd = -1;
 501         }
 502
 503         if (in->console.fd.fd > -1) {
 504                 ustream_free(&in->console.stream);
 505                 close(in->console.fd.fd);
 506                 in->console.fd.fd = -1;
 507         }
 508
 509         if (in->console_client.fd.fd > -1) {
 510                 ustream_free(&in->console_client.stream);
 511                 close(in->console_client.fd.fd);
 512                 in->console_client.fd.fd = -1;
 513         }
 514 }
 515
 516 void
 517 instance_start(struct service_instance *in)
 518 {
 519         int pid;
 520         int opipe[2] = { -1, -1 };
 521         int epipe[2] = { -1, -1 };
 522
 523         if (!avl_is_empty(&in->errors.avl)) {
 524                 LOG("Not starting instance %s::%s, an error was indicated\n", in->srv->name, in->name);
 525                 return;
 526         }
 527
 528         if (!in->bundle && !in->command) {
 529                 LOG("Not starting instance %s::%s, command not set\n", in->srv->name, in->name);
 530                 return;
 531         }
 532
 533         if (in->proc.pending) {
 534                 if (in->halt)
 535                         in->restart = true;
 536                 return;
 537         }
 538
 539         instance_free_stdio(in);
 540         if (in->_stdout.fd.fd > -2) {
 541                 if (pipe(opipe)) {
 542                         ULOG_WARN("pipe() failed: %m\n");
 543                         opipe[0] = opipe[1] = -1;
 544                 }
 545         }
 546
 547         if (in->_stderr.fd.fd > -2) {
 548                 if (pipe(epipe)) {
 549                         ULOG_WARN("pipe() failed: %m\n");
 550                         epipe[0] = epipe[1] = -1;
 551                 }
 552         }
 553
 554         in->restart = false;
 555         in->halt = false;
 556
 557         if (!in->valid)
 558                 return;
 559
 560         pid = fork();
 561         if (pid < 0)
 562                 return;
 563
 564         if (!pid) {
 565                 uloop_done();
 566                 closefd(opipe[0]);
 567                 closefd(epipe[0]);
 568                 instance_add_cgroup(in->srv->name, in->name);
 569                 instance_run(in, opipe[1], epipe[1]);
 570                 return;
 571         }
 572
 573         DEBUG(2, "Started instance %s::%s[%d]\n", in->srv->name, in->name, pid);
 574         in->proc.pid = pid;
 575         instance_writepid(in);
 576         clock_gettime(CLOCK_MONOTONIC, &in->start);
 577         uloop_process_add(&in->proc);
 578
 579         if (opipe[0] > -1) {
 580                 ustream_fd_init(&in->_stdout, opipe[0]);
 581                 closefd(opipe[1]);
 582                 fcntl(opipe[0], F_SETFD, FD_CLOEXEC);
 583         }
 584
 585         if (epipe[0] > -1) {
 586                 ustream_fd_init(&in->_stderr, epipe[0]);
 587                 closefd(epipe[1]);
 588                 fcntl(epipe[0], F_SETFD, FD_CLOEXEC);
 589         }
 590
 591         if (in->watchdog.mode != INSTANCE_WATCHDOG_MODE_DISABLED) {
 592                 uloop_timeout_set(&in->watchdog.timeout, in->watchdog.freq * 1000);
 593                 DEBUG(2, "Started instance %s::%s watchdog timer : timeout = %d\n", in->srv->name, in->name, in->watchdog.freq);
 594         }
 595
 596         service_event("instance.start", in->srv->name, in->name);
 597 }
 598
 599 static void
 600 instance_stdio(struct ustream *s, int prio, struct service_instance *in)
 601 {
 602         char *newline, *str, *arg0, ident[32];
 603         int len;
 604
 605         arg0 = basename(blobmsg_data(blobmsg_data(in->command)));
 606         snprintf(ident, sizeof(ident), "%s[%d]", arg0, in->proc.pid);
 607         ulog_open(ULOG_SYSLOG, in->syslog_facility, ident);
 608
 609         do {
 610                 str = ustream_get_read_buf(s, &len);
 611                 if (!str)
 612                         break;
 613
 614                 newline = memchr(str, '\n', len);
 615                 if (!newline && (s->r.buffer_len != len))
 616                         break;
 617
 618                 if (newline) {
 619                         *newline = 0;
 620                         len = newline + 1 - str;
 621                 }
 622                 ulog(prio, "%s\n", str);
 623
 624                 ustream_consume(s, len);
 625         } while (1);
 626
 627         ulog_open(ULOG_SYSLOG, LOG_DAEMON, "procd");
 628 }
 629
 630 static void
 631 instance_stdout(struct ustream *s, int bytes)
 632 {
 633         instance_stdio(s, LOG_INFO,
 634                        container_of(s, struct service_instance, _stdout.stream));
 635 }
 636
 637 static void
 638 instance_console(struct ustream *s, int bytes)
 639 {
 640         struct service_instance *in = container_of(s, struct service_instance, console.stream);
 641         char *buf;
 642         int len;
 643
 644         do {
 645                 buf = ustream_get_read_buf(s, &len);
 646                 if (!buf)
 647                         break;
 648
 649                 ulog(LOG_INFO, "out: %s\n", buf);
 650
 651                 /* test if console client is attached */
 652                 if (in->console_client.fd.fd > -1)
 653                         ustream_write(&in->console_client.stream, buf, len, false);
 654
 655                 ustream_consume(s, len);
 656         } while (1);
 657 }
 658
 659 static void
 660 instance_console_client(struct ustream *s, int bytes)
 661 {
 662         struct service_instance *in = container_of(s, struct service_instance, console_client.stream);
 663         char *buf;
 664         int len;
 665
 666         do {
 667                 buf = ustream_get_read_buf(s, &len);
 668                 if (!buf)
 669                         break;
 670
 671                 ulog(LOG_INFO, "in: %s\n", buf);
 672                 ustream_write(&in->console.stream, buf, len, false);
 673                 ustream_consume(s, len);
 674         } while (1);
 675 }
 676
 677 static void
 678 instance_stderr(struct ustream *s, int bytes)
 679 {
 680         instance_stdio(s, LOG_ERR,
 681                        container_of(s, struct service_instance, _stderr.stream));
 682 }
 683
 684 static void
 685 instance_timeout(struct uloop_timeout *t)
 686 {
 687         struct service_instance *in;
 688
 689         in = container_of(t, struct service_instance, timeout);
 690
 691         if (in->halt) {
 692                 LOG("Instance %s::%s pid %d not stopped on SIGTERM, sending SIGKILL instead\n",
 693                                 in->srv->name, in->name, in->proc.pid);
 694                 kill(in->proc.pid, SIGKILL);
 695         } else if (in->restart || in->respawn)
 696                 instance_start(in);
 697 }
 698
 699 static void
 700 instance_delete(struct service_instance *in)
 701 {
 702         struct service *s = in->srv;
 703
 704         avl_delete(&s->instances.avl, &in->node.avl);
 705         instance_free(in);
 706         service_stopped(s);
 707 }
 708
 709 static int
 710 instance_exit_code(int ret)
 711 {
 712         if (WIFEXITED(ret)) {
 713                 return WEXITSTATUS(ret);
 714         }
 715
 716         if (WIFSIGNALED(ret)) {
 717                 return SIGNALLED_OFFSET + WTERMSIG(ret);
 718         }
 719
 720         if (WIFSTOPPED(ret)) {
 721                 return WSTOPSIG(ret);
 722         }
 723
 724         return 1;
 725 }
 726
 727 static void
 728 instance_exit(struct uloop_process *p, int ret)
 729 {
 730         struct service_instance *in;
 731         struct timespec tp;
 732         long runtime;
 733
 734         in = container_of(p, struct service_instance, proc);
 735
 736         clock_gettime(CLOCK_MONOTONIC, &tp);
 737         runtime = tp.tv_sec - in->start.tv_sec;
 738
 739         DEBUG(2, "Instance %s::%s exit with error code %d after %ld seconds\n", in->srv->name, in->name, ret, runtime);
 740
 741         in->exit_code = instance_exit_code(ret);
 742         uloop_timeout_cancel(&in->timeout);
 743         uloop_timeout_cancel(&in->watchdog.timeout);
 744         service_event("instance.stop", in->srv->name, in->name);
 745
 746         if (in->halt) {
 747                 instance_removepid(in);
 748                 if (in->restart)
 749                         instance_start(in);
 750                 else
 751                         instance_delete(in);
 752         } else if (in->restart) {
 753                 instance_start(in);
 754         } else if (in->respawn) {
 755                 if (runtime < in->respawn_threshold)
 756                         in->respawn_count++;
 757                 else
 758                         in->respawn_count = 0;
 759                 if (in->respawn_count > in->respawn_retry && in->respawn_retry > 0 ) {
 760                         LOG("Instance %s::%s s in a crash loop %d crashes, %ld seconds since last crash\n",
 761                                                                 in->srv->name, in->name, in->respawn_count, runtime);
 762                         in->restart = in->respawn = 0;
 763                         in->halt = 1;
 764                         service_event("instance.fail", in->srv->name, in->name);
 765                 } else {
 766                         service_event("instance.respawn", in->srv->name, in->name);
 767                         uloop_timeout_set(&in->timeout, in->respawn_timeout * 1000);
 768                 }
 769         }
 770 }
 771
 772 void
 773 instance_stop(struct service_instance *in, bool halt)
 774 {
 775         if (!in->proc.pending) {
 776                 if (halt)
 777                         instance_delete(in);
 778                 return;
 779         }
 780         in->halt = halt;
 781         in->restart = in->respawn = false;
 782         kill(in->proc.pid, SIGTERM);
 783         uloop_timeout_set(&in->timeout, in->term_timeout * 1000);
 784 }
 785
 786 static void
 787 instance_restart(struct service_instance *in)
 788 {
 789         if (!in->proc.pending)
 790                 return;
 791
 792         if (in->reload_signal) {
 793                 kill(in->proc.pid, in->reload_signal);
 794                 return;
 795         }
 796
 797         in->halt = true;
 798         in->restart = true;
 799         kill(in->proc.pid, SIGTERM);
 800         uloop_timeout_set(&in->timeout, in->term_timeout * 1000);
 801 }
 802
 803 static void
 804 instance_watchdog(struct uloop_timeout *t)
 805 {
 806         struct service_instance *in = container_of(t, struct service_instance, watchdog.timeout);
 807
 808         DEBUG(3, "instance %s::%s watchdog timer expired\n", in->srv->name, in->name);
 809
 810         if (in->respawn)
 811                 instance_restart(in);
 812         else
 813                 instance_stop(in, true);
 814 }
 815
 816 static bool string_changed(const char *a, const char *b)
 817 {
 818         return !((!a && !b) || (a && b && !strcmp(a, b)));
 819 }
 820
 821 static bool
 822 instance_config_changed(struct service_instance *in, struct service_instance *in_new)
 823 {
 824         if (!in->valid)
 825                 return true;
 826
 827         if (!blob_attr_equal(in->command, in_new->command))
 828                 return true;
 829
 830         if (string_changed(in->bundle, in_new->bundle))
 831                 return true;
 832
 833         if (string_changed(in->extroot, in_new->extroot))
 834                 return true;
 835
 836         if (string_changed(in->overlaydir, in_new->overlaydir))
 837                 return true;
 838
 839         if (string_changed(in->tmpoverlaysize, in_new->tmpoverlaysize))
 840                 return true;
 841
 842         if (!blobmsg_list_equal(&in->env, &in_new->env))
 843                 return true;
 844
 845         if (!blobmsg_list_equal(&in->netdev, &in_new->netdev))
 846                 return true;
 847
 848         if (!blobmsg_list_equal(&in->file, &in_new->file))
 849                 return true;
 850
 851         if (in->nice != in_new->nice)
 852                 return true;
 853
 854         if (in->syslog_facility != in_new->syslog_facility)
 855                 return true;
 856
 857         if (string_changed(in->user, in_new->user))
 858                 return true;
 859
 860         if (string_changed(in->group, in_new->group))
 861                 return true;
 862
 863         if (in->uid != in_new->uid)
 864                 return true;
 865
 866         if (in->pw_gid != in_new->pw_gid)
 867                 return true;
 868
 869         if (in->gr_gid != in_new->gr_gid)
 870                 return true;
 871
 872         if (string_changed(in->pidfile, in_new->pidfile))
 873                 return true;
 874
 875         if (in->respawn_retry != in_new->respawn_retry)
 876                 return true;
 877         if (in->respawn_threshold != in_new->respawn_threshold)
 878                 return true;
 879         if (in->respawn_timeout != in_new->respawn_timeout)
 880                 return true;
 881
 882         if (in->reload_signal != in_new->reload_signal)
 883                 return true;
 884
 885         if (in->term_timeout != in_new->term_timeout)
 886                 return true;
 887
 888         if (string_changed(in->seccomp, in_new->seccomp))
 889                 return true;
 890
 891         if (!blobmsg_list_equal(&in->limits, &in_new->limits))
 892                 return true;
 893
 894         if (!blobmsg_list_equal(&in->jail.mount, &in_new->jail.mount))
 895                 return true;
 896
 897         if (!blobmsg_list_equal(&in->errors, &in_new->errors))
 898                 return true;
 899
 900         if (in->has_jail != in_new->has_jail)
 901                 return true;
 902
 903         if (in->trace != in_new->trace)
 904                 return true;
 905
 906         if (in->require_jail != in_new->require_jail)
 907                 return true;
 908
 909         if (in->immediately != in_new->immediately)
 910                 return true;
 911
 912         if (in->no_new_privs != in_new->no_new_privs)
 913                 return true;
 914
 915         if (string_changed(in->jail.name, in_new->jail.name))
 916                 return true;
 917
 918         if (string_changed(in->jail.hostname, in_new->jail.hostname))
 919                 return true;
 920
 921         if (in->jail.procfs != in_new->jail.procfs)
 922                 return true;
 923
 924         if (in->jail.sysfs != in_new->jail.sysfs)
 925                 return true;
 926
 927         if (in->jail.ubus != in_new->jail.ubus)
 928                 return true;
 929
 930         if (in->jail.log != in_new->jail.log)
 931                 return true;
 932
 933         if (in->jail.ronly != in_new->jail.ronly)
 934                 return true;
 935
 936         if (in->jail.netns != in_new->jail.netns)
 937                 return true;
 938
 939         if (in->jail.userns != in_new->jail.userns)
 940                 return true;
 941
 942         if (in->jail.cgroupsns != in_new->jail.cgroupsns)
 943                 return true;
 944
 945         if (in->jail.console != in_new->jail.console)
 946                 return true;
 947
 948         if (!blobmsg_list_equal(&in->jail.mount, &in_new->jail.mount))
 949                 return true;
 950
 951         if (in->watchdog.mode != in_new->watchdog.mode)
 952                 return true;
 953
 954         if (in->watchdog.freq != in_new->watchdog.freq)
 955                 return true;
 956
 957         return false;
 958 }
 959
 960 static bool
 961 instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 962 {
 963         struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
 964         struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
 965
 966         return n1->ifindex == n2->ifindex;
 967 }
 968
 969 static void
 970 instance_netdev_update(struct blobmsg_list_node *l)
 971 {
 972         struct instance_netdev *n = container_of(l, struct instance_netdev, node);
 973
 974         n->ifindex = if_nametoindex(n->node.avl.key);
 975 }
 976
 977 static bool
 978 instance_file_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 979 {
 980         struct instance_file *f1 = container_of(l1, struct instance_file, node);
 981         struct instance_file *f2 = container_of(l2, struct instance_file, node);
 982
 983         return !memcmp(f1->md5, f2->md5, sizeof(f1->md5));
 984 }
 985
 986 static void
 987 instance_file_update(struct blobmsg_list_node *l)
 988 {
 989         struct instance_file *f = container_of(l, struct instance_file, node);
 990         md5_ctx_t md5;
 991         char buf[256];
 992         int len, fd;
 993
 994         memset(f->md5, 0, sizeof(f->md5));
 995
 996         fd = open(l->avl.key, O_RDONLY);
 997         if (fd < 0)
 998                 return;
 999
1000         md5_begin(&md5);
1001         do {
1002                 len = read(fd, buf, sizeof(buf));
1003                 if (len < 0) {
1004                         if (errno == EINTR)
1005                                 continue;
1006
1007                         break;
1008                 }
1009                 if (!len)
1010                         break;
1011
1012                 md5_hash(buf, len, &md5);
1013         } while(1);
1014
1015         md5_end(f->md5, &md5);
1016         close(fd);
1017 }
1018
1019 static void
1020 instance_fill_any(struct blobmsg_list *l, struct blob_attr *cur)
1021 {
1022         if (!cur)
1023                 return;
1024
1025         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), false);
1026 }
1027
1028 static bool
1029 instance_fill_array(struct blobmsg_list *l, struct blob_attr *cur, blobmsg_update_cb cb, bool array)
1030 {
1031         struct blobmsg_list_node *node;
1032
1033         if (!cur)
1034                 return true;
1035
1036         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
1037                 return false;
1038
1039         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), array);
1040         if (cb) {
1041                 blobmsg_list_for_each(l, node)
1042                         cb(node);
1043         }
1044         return true;
1045 }
1046
1047 static int
1048 instance_jail_parse(struct service_instance *in, struct blob_attr *attr)
1049 {
1050         struct blob_attr *tb[__JAIL_ATTR_MAX];
1051         struct jail *jail = &in->jail;
1052
1053         blobmsg_parse(jail_attr, __JAIL_ATTR_MAX, tb,
1054                 blobmsg_data(attr), blobmsg_data_len(attr));
1055
1056         jail->argc = 2;
1057
1058         if (tb[JAIL_ATTR_REQUIREJAIL] && blobmsg_get_bool(tb[JAIL_ATTR_REQUIREJAIL])) {
1059                 in->require_jail = true;
1060                 jail->argc++;
1061         }
1062         if (tb[JAIL_ATTR_IMMEDIATELY] && blobmsg_get_bool(tb[JAIL_ATTR_IMMEDIATELY])) {
1063                 in->immediately = true;
1064                 jail->argc++;
1065         }
1066         if (tb[JAIL_ATTR_NAME]) {
1067                 jail->name = strdup(blobmsg_get_string(tb[JAIL_ATTR_NAME]));
1068                 jail->argc += 2;
1069         }
1070         if (tb[JAIL_ATTR_HOSTNAME]) {
1071                 jail->hostname = strdup(blobmsg_get_string(tb[JAIL_ATTR_HOSTNAME]));
1072                 jail->argc += 2;
1073         }
1074         if (tb[JAIL_ATTR_PROCFS] && blobmsg_get_bool(tb[JAIL_ATTR_PROCFS])) {
1075                 jail->procfs = true;
1076                 jail->argc++;
1077         }
1078         if (tb[JAIL_ATTR_SYSFS] && blobmsg_get_bool(tb[JAIL_ATTR_SYSFS])) {
1079                 jail->sysfs = true;
1080                 jail->argc++;
1081         }
1082         if (tb[JAIL_ATTR_UBUS] && blobmsg_get_bool(tb[JAIL_ATTR_UBUS])) {
1083                 jail->ubus = true;
1084                 jail->argc++;
1085         }
1086         if (tb[JAIL_ATTR_LOG] && blobmsg_get_bool(tb[JAIL_ATTR_LOG])) {
1087                 jail->log = true;
1088                 jail->argc++;
1089         }
1090         if (tb[JAIL_ATTR_RONLY] && blobmsg_get_bool(tb[JAIL_ATTR_RONLY])) {
1091                 jail->ronly = true;
1092                 jail->argc++;
1093         }
1094         if (tb[JAIL_ATTR_NETNS] && blobmsg_get_bool(tb[JAIL_ATTR_NETNS])) {
1095                 jail->netns = true;
1096                 jail->argc++;
1097         }
1098         if (tb[JAIL_ATTR_USERNS] && blobmsg_get_bool(tb[JAIL_ATTR_USERNS])) {
1099                 jail->userns = true;
1100                 jail->argc++;
1101         }
1102         if (tb[JAIL_ATTR_CGROUPSNS] && blobmsg_get_bool(tb[JAIL_ATTR_CGROUPSNS])) {
1103                 jail->cgroupsns = true;
1104                 jail->argc++;
1105         }
1106         if (tb[JAIL_ATTR_CONSOLE] && blobmsg_get_bool(tb[JAIL_ATTR_CONSOLE])) {
1107                 jail->console = true;
1108                 jail->argc++;
1109         }
1110
1111         if (tb[JAIL_ATTR_MOUNT]) {
1112                 struct blob_attr *cur;
1113                 int rem;
1114
1115                 blobmsg_for_each_attr(cur, tb[JAIL_ATTR_MOUNT], rem)
1116                         jail->argc += 2;
1117                 instance_fill_array(&jail->mount, tb[JAIL_ATTR_MOUNT], NULL, false);
1118         }
1119         if (in->seccomp)
1120                 jail->argc += 2;
1121
1122         if (in->user)
1123                 jail->argc += 2;
1124
1125         if (in->group)
1126                 jail->argc += 2;
1127
1128         if (in->extroot)
1129                 jail->argc += 2;
1130
1131         if (in->overlaydir)
1132                 jail->argc += 2;
1133
1134         if (in->tmpoverlaysize)
1135                 jail->argc += 2;
1136
1137         if (in->no_new_privs)
1138                 jail->argc++;
1139
1140         if (in->bundle)
1141                 jail->argc += 2;
1142
1143         return true;
1144 }
1145
1146 static bool
1147 instance_config_parse_command(struct service_instance *in, struct blob_attr **tb)
1148 {
1149         struct blob_attr *cur, *cur2;
1150         bool ret = false;
1151         int rem;
1152
1153         cur = tb[INSTANCE_ATTR_COMMAND];
1154         if (!cur) {
1155                 in->command = NULL;
1156                 return true;
1157         }
1158
1159         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
1160                 return false;
1161
1162         blobmsg_for_each_attr(cur2, cur, rem) {
1163                 ret = true;
1164                 break;
1165         }
1166
1167         in->command = cur;
1168         return ret;
1169 }
1170
1171 static bool
1172 instance_config_parse(struct service_instance *in)
1173 {
1174         struct blob_attr *tb[__INSTANCE_ATTR_MAX];
1175         struct blob_attr *cur, *cur2;
1176         struct stat s;
1177         int rem, r;
1178
1179         blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
1180                 blobmsg_data(in->config), blobmsg_data_len(in->config));
1181
1182         if (!tb[INSTANCE_ATTR_BUNDLE] && !instance_config_parse_command(in, tb))
1183                         return false;
1184
1185         if (tb[INSTANCE_ATTR_TERMTIMEOUT])
1186                 in->term_timeout = blobmsg_get_u32(tb[INSTANCE_ATTR_TERMTIMEOUT]);
1187         if (tb[INSTANCE_ATTR_RESPAWN]) {
1188                 int i = 0;
1189                 uint32_t vals[3] = { 3600, 5, 5};
1190
1191                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_RESPAWN], rem) {
1192                         if ((i >= 3) && (blobmsg_type(cur2) == BLOBMSG_TYPE_STRING))
1193                                 continue;
1194                         vals[i] = atoi(blobmsg_get_string(cur2));
1195                         i++;
1196                 }
1197                 in->respawn = true;
1198                 in->respawn_count = 0;
1199                 in->respawn_threshold = vals[0];
1200                 in->respawn_timeout = vals[1];
1201                 in->respawn_retry = vals[2];
1202         }
1203         if (tb[INSTANCE_ATTR_TRIGGER]) {
1204                 in->trigger = tb[INSTANCE_ATTR_TRIGGER];
1205                 trigger_add(in->trigger, in);
1206         }
1207
1208         if (tb[INSTANCE_ATTR_WATCH]) {
1209                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_WATCH], rem) {
1210                         if (blobmsg_type(cur2) != BLOBMSG_TYPE_STRING)
1211                                 continue;
1212                         DEBUG(3, "watch for %s\n", blobmsg_get_string(cur2));
1213                         watch_add(blobmsg_get_string(cur2), in);
1214                 }
1215         }
1216
1217         if ((cur = tb[INSTANCE_ATTR_NICE])) {
1218                 in->nice = (int8_t) blobmsg_get_u32(cur);
1219                 if (in->nice < -20 || in->nice > 20)
1220                         return false;
1221         }
1222
1223         if (tb[INSTANCE_ATTR_USER]) {
1224                 const char *user = blobmsg_get_string(tb[INSTANCE_ATTR_USER]);
1225                 struct passwd *p = getpwnam(user);
1226                 if (p) {
1227                         in->user = strdup(user);
1228                         in->uid = p->pw_uid;
1229                         in->gr_gid = in->pw_gid = p->pw_gid;
1230                 }
1231         }
1232
1233         if (tb[INSTANCE_ATTR_GROUP]) {
1234                 const char *group = blobmsg_get_string(tb[INSTANCE_ATTR_GROUP]);
1235                 struct group *p = getgrnam(group);
1236                 if (p) {
1237                         in->group = strdup(group);
1238                         in->gr_gid = p->gr_gid;
1239                 }
1240         }
1241
1242         if (tb[INSTANCE_ATTR_TRACE])
1243                 in->trace = blobmsg_get_bool(tb[INSTANCE_ATTR_TRACE]);
1244
1245         if (tb[INSTANCE_ATTR_NO_NEW_PRIVS])
1246                 in->no_new_privs = blobmsg_get_bool(tb[INSTANCE_ATTR_NO_NEW_PRIVS]);
1247
1248         if (!in->trace && tb[INSTANCE_ATTR_SECCOMP])
1249                 in->seccomp = strdup(blobmsg_get_string(tb[INSTANCE_ATTR_SECCOMP]));
1250
1251         if (tb[INSTANCE_ATTR_EXTROOT])
1252                 in->extroot = strdup(blobmsg_get_string(tb[INSTANCE_ATTR_EXTROOT]));
1253
1254         if (tb[INSTANCE_ATTR_OVERLAYDIR])
1255                 in->overlaydir = strdup(blobmsg_get_string(tb[INSTANCE_ATTR_OVERLAYDIR]));
1256
1257         if (tb[INSTANCE_ATTR_TMPOVERLAYSIZE])
1258                 in->tmpoverlaysize = strdup(blobmsg_get_string(tb[INSTANCE_ATTR_TMPOVERLAYSIZE]));
1259
1260         if (tb[INSTANCE_ATTR_BUNDLE])
1261                 in->bundle = strdup(blobmsg_get_string(tb[INSTANCE_ATTR_BUNDLE]));
1262
1263         if (tb[INSTANCE_ATTR_PIDFILE]) {
1264                 char *pidfile = blobmsg_get_string(tb[INSTANCE_ATTR_PIDFILE]);
1265                 if (pidfile)
1266                         in->pidfile = strdup(pidfile);
1267         }
1268
1269         if (tb[INSTANCE_ATTR_RELOADSIG])
1270                 in->reload_signal = blobmsg_get_u32(tb[INSTANCE_ATTR_RELOADSIG]);
1271
1272         if (!in->trace && tb[INSTANCE_ATTR_JAIL])
1273                 in->has_jail = instance_jail_parse(in, tb[INSTANCE_ATTR_JAIL]);
1274
1275         if (in->has_jail) {
1276                 r = stat(UJAIL_BIN_PATH, &s);
1277                 if (r < 0) {
1278                         if (in->require_jail) {
1279                                 ERROR("Cannot jail service %s::%s. %s: %m (%d)\n",
1280                                                 in->srv->name, in->name, UJAIL_BIN_PATH, r);
1281                                 return false;
1282                         }
1283                         DEBUG(2, "unable to find %s: %m (%d)\n", UJAIL_BIN_PATH, r);
1284                         in->has_jail = false;
1285                 }
1286         }
1287
1288         if (tb[INSTANCE_ATTR_STDOUT] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDOUT]))
1289                 in->_stdout.fd.fd = -1;
1290
1291         if (tb[INSTANCE_ATTR_STDERR] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDERR]))
1292                 in->_stderr.fd.fd = -1;
1293
1294         instance_fill_any(&in->data, tb[INSTANCE_ATTR_DATA]);
1295
1296         if (!instance_fill_array(&in->env, tb[INSTANCE_ATTR_ENV], NULL, false))
1297                 return false;
1298
1299         if (!instance_fill_array(&in->netdev, tb[INSTANCE_ATTR_NETDEV], instance_netdev_update, true))
1300                 return false;
1301
1302         if (!instance_fill_array(&in->file, tb[INSTANCE_ATTR_FILE], instance_file_update, true))
1303                 return false;
1304
1305         if (!instance_fill_array(&in->limits, tb[INSTANCE_ATTR_LIMITS], NULL, false))
1306                 return false;
1307
1308         if (!instance_fill_array(&in->errors, tb[INSTANCE_ATTR_ERROR], NULL, true))
1309                 return false;
1310
1311         if (tb[INSTANCE_ATTR_FACILITY]) {
1312                 int facility = syslog_facility_str_to_int(blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
1313                 if (facility != -1) {
1314                         in->syslog_facility = facility;
1315                         DEBUG(3, "setting facility '%s'\n", blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
1316                 } else
1317                         DEBUG(3, "unknown syslog facility '%s' given, using default (LOG_DAEMON)\n", blobmsg_get_string(tb[INSTANCE_ATTR_FACILITY]));
1318         }
1319
1320         if (tb[INSTANCE_ATTR_WATCHDOG]) {
1321                 int i = 0;
1322                 uint32_t vals[2] = { 0, 30 };
1323
1324                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_WATCHDOG], rem) {
1325                         if (i >= 2)
1326                                 break;
1327
1328                         vals[i] = atoi(blobmsg_get_string(cur2));
1329                         i++;
1330                 }
1331
1332                 if (vals[0] >= 0 && vals[0] < __INSTANCE_WATCHDOG_MODE_MAX) {
1333                         in->watchdog.mode = vals[0];
1334                         DEBUG(3, "setting watchdog mode (%d)\n", vals[0]);
1335                 } else {
1336                         in->watchdog.mode = 0;
1337                         DEBUG(3, "unknown watchdog mode (%d) given, using default (0)\n", vals[0]);
1338                 }
1339
1340                 if (vals[1] > 0) {
1341                         in->watchdog.freq = vals[1];
1342                         DEBUG(3, "setting watchdog timeout (%d)\n", vals[0]);
1343                 } else {
1344                         in->watchdog.freq = 30;
1345                         DEBUG(3, "invalid watchdog timeout (%d) given, using default (30)\n", vals[1]);
1346                 }
1347         }
1348
1349         return true;
1350 }
1351
1352 static void
1353 instance_config_cleanup(struct service_instance *in)
1354 {
1355         blobmsg_list_free(&in->env);
1356         blobmsg_list_free(&in->data);
1357         blobmsg_list_free(&in->netdev);
1358         blobmsg_list_free(&in->file);
1359         blobmsg_list_free(&in->limits);
1360         blobmsg_list_free(&in->errors);
1361         blobmsg_list_free(&in->jail.mount);
1362 }
1363
1364 static void
1365 instance_config_move_strdup(char **dst, char *src)
1366 {
1367         if (*dst) {
1368                 free(*dst);
1369                 *dst = NULL;
1370         }
1371
1372         if (!src)
1373                 return;
1374
1375         *dst = strdup(src);
1376 }
1377
1378 static void
1379 instance_config_move(struct service_instance *in, struct service_instance *in_src)
1380 {
1381         instance_config_cleanup(in);
1382         blobmsg_list_move(&in->env, &in_src->env);
1383         blobmsg_list_move(&in->data, &in_src->data);
1384         blobmsg_list_move(&in->netdev, &in_src->netdev);
1385         blobmsg_list_move(&in->file, &in_src->file);
1386         blobmsg_list_move(&in->limits, &in_src->limits);
1387         blobmsg_list_move(&in->errors, &in_src->errors);
1388         blobmsg_list_move(&in->jail.mount, &in_src->jail.mount);
1389         in->trigger = in_src->trigger;
1390         in->command = in_src->command;
1391         in->respawn = in_src->respawn;
1392         in->respawn_retry = in_src->respawn_retry;
1393         in->respawn_threshold = in_src->respawn_threshold;
1394         in->respawn_timeout = in_src->respawn_timeout;
1395         in->reload_signal = in_src->reload_signal;
1396         in->term_timeout = in_src->term_timeout;
1397         in->watchdog.mode = in_src->watchdog.mode;
1398         in->watchdog.freq = in_src->watchdog.freq;
1399         in->watchdog.timeout = in_src->watchdog.timeout;
1400         in->name = in_src->name;
1401         in->nice = in_src->nice;
1402         in->trace = in_src->trace;
1403         in->node.avl.key = in_src->node.avl.key;
1404         in->syslog_facility = in_src->syslog_facility;
1405         in->require_jail = in_src->require_jail;
1406         in->no_new_privs = in_src->no_new_privs;
1407         in->immediately = in_src->immediately;
1408         in->uid = in_src->uid;
1409         in->pw_gid = in_src->pw_gid;
1410         in->gr_gid = in_src->gr_gid;
1411
1412         in->has_jail = in_src->has_jail;
1413         in->jail.procfs = in_src->jail.procfs;
1414         in->jail.sysfs = in_src->jail.sysfs;
1415         in->jail.ubus = in_src->jail.ubus;
1416         in->jail.log = in_src->jail.log;
1417         in->jail.ronly = in_src->jail.ronly;
1418         in->jail.netns = in_src->jail.netns;
1419         in->jail.cgroupsns = in_src->jail.cgroupsns;
1420         in->jail.console = in_src->jail.console;
1421         in->jail.argc = in_src->jail.argc;
1422
1423         instance_config_move_strdup(&in->pidfile, in_src->pidfile);
1424         instance_config_move_strdup(&in->seccomp, in_src->seccomp);
1425         instance_config_move_strdup(&in->bundle, in_src->bundle);
1426         instance_config_move_strdup(&in->extroot, in_src->extroot);
1427         instance_config_move_strdup(&in->overlaydir, in_src->overlaydir);
1428         instance_config_move_strdup(&in->tmpoverlaysize, in_src->tmpoverlaysize);
1429         instance_config_move_strdup(&in->user, in_src->user);
1430         instance_config_move_strdup(&in->group, in_src->group);
1431         instance_config_move_strdup(&in->jail.name, in_src->jail.name);
1432         instance_config_move_strdup(&in->jail.hostname, in_src->jail.hostname);
1433
1434         free(in->config);
1435         in->config = in_src->config;
1436         in_src->config = NULL;
1437 }
1438
1439 void
1440 instance_update(struct service_instance *in, struct service_instance *in_new)
1441 {
1442         bool changed = instance_config_changed(in, in_new);
1443         bool running = in->proc.pending;
1444         bool stopping = in->halt;
1445
1446         if (!running || stopping) {
1447                 instance_config_move(in, in_new);
1448                 instance_start(in);
1449         } else {
1450                 if (changed)
1451                         instance_restart(in);
1452                 instance_config_move(in, in_new);
1453                 /* restart happens in the child callback handler */
1454         }
1455 }
1456
1457 void
1458 instance_free(struct service_instance *in)
1459 {
1460         instance_free_stdio(in);
1461         uloop_process_delete(&in->proc);
1462         uloop_timeout_cancel(&in->timeout);
1463         uloop_timeout_cancel(&in->watchdog.timeout);
1464         trigger_del(in);
1465         watch_del(in);
1466         instance_config_cleanup(in);
1467         free(in->config);
1468         free(in->user);
1469         free(in->group);
1470         free(in->extroot);
1471         free(in->overlaydir);
1472         free(in->tmpoverlaysize);
1473         free(in->bundle);
1474         free(in->jail.name);
1475         free(in->jail.hostname);
1476         free(in->seccomp);
1477         free(in->pidfile);
1478         free(in);
1479 }
1480
1481 void
1482 instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
1483 {
1484         config = blob_memdup(config);
1485         in->srv = s;
1486         in->name = blobmsg_name(config);
1487         in->config = config;
1488         in->timeout.cb = instance_timeout;
1489         in->proc.cb = instance_exit;
1490         in->term_timeout = 5;
1491         in->syslog_facility = LOG_DAEMON;
1492         in->exit_code = 0;
1493         in->require_jail = false;
1494         in->immediately = false;
1495
1496         in->_stdout.fd.fd = -2;
1497         in->_stdout.stream.string_data = true;
1498         in->_stdout.stream.notify_read = instance_stdout;
1499
1500         in->_stderr.fd.fd = -2;
1501         in->_stderr.stream.string_data = true;
1502         in->_stderr.stream.notify_read = instance_stderr;
1503
1504         in->console.fd.fd = -2;
1505         in->console.stream.string_data = true;
1506         in->console.stream.notify_read = instance_console;
1507
1508         in->console_client.fd.fd = -2;
1509         in->console_client.stream.string_data = true;
1510         in->console_client.stream.notify_read = instance_console_client;
1511
1512         blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
1513         blobmsg_list_init(&in->file, struct instance_file, node, instance_file_cmp);
1514         blobmsg_list_simple_init(&in->env);
1515         blobmsg_list_simple_init(&in->data);
1516         blobmsg_list_simple_init(&in->limits);
1517         blobmsg_list_simple_init(&in->errors);
1518         blobmsg_list_simple_init(&in->jail.mount);
1519
1520         in->watchdog.timeout.cb = instance_watchdog;
1521
1522         in->valid = instance_config_parse(in);
1523 }
1524
1525 void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
1526 {
1527         void *i;
1528
1529         if (!in->valid)
1530                 return;
1531
1532         i = blobmsg_open_table(b, in->name);
1533         blobmsg_add_u8(b, "running", in->proc.pending);
1534         if (in->proc.pending)
1535                 blobmsg_add_u32(b, "pid", in->proc.pid);
1536         if (in->command)
1537                 blobmsg_add_blob(b, in->command);
1538         if (in->bundle)
1539                 blobmsg_add_string(b, "bundle", in->bundle);
1540         blobmsg_add_u32(b, "term_timeout", in->term_timeout);
1541         if (!in->proc.pending)
1542                 blobmsg_add_u32(b, "exit_code", in->exit_code);
1543
1544         if (!avl_is_empty(&in->errors.avl)) {
1545                 struct blobmsg_list_node *var;
1546                 void *e = blobmsg_open_array(b, "errors");
1547                 blobmsg_list_for_each(&in->errors, var)
1548                         blobmsg_add_string(b, NULL, blobmsg_data(var->data));
1549                 blobmsg_close_table(b, e);
1550         }
1551
1552         if (!avl_is_empty(&in->env.avl)) {
1553                 struct blobmsg_list_node *var;
1554                 void *e = blobmsg_open_table(b, "env");
1555                 blobmsg_list_for_each(&in->env, var)
1556                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1557                 blobmsg_close_table(b, e);
1558         }
1559
1560         if (!avl_is_empty(&in->data.avl)) {
1561                 struct blobmsg_list_node *var;
1562                 void *e = blobmsg_open_table(b, "data");
1563                 blobmsg_list_for_each(&in->data, var)
1564                         blobmsg_add_blob(b, var->data);
1565                 blobmsg_close_table(b, e);
1566         }
1567
1568         if (!avl_is_empty(&in->limits.avl)) {
1569                 struct blobmsg_list_node *var;
1570                 void *e = blobmsg_open_table(b, "limits");
1571                 blobmsg_list_for_each(&in->limits, var)
1572                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1573                 blobmsg_close_table(b, e);
1574         }
1575
1576         if (in->reload_signal)
1577                 blobmsg_add_u32(b, "reload_signal", in->reload_signal);
1578
1579         if (in->respawn) {
1580                 void *r = blobmsg_open_table(b, "respawn");
1581                 blobmsg_add_u32(b, "threshold", in->respawn_threshold);
1582                 blobmsg_add_u32(b, "timeout", in->respawn_timeout);
1583                 blobmsg_add_u32(b, "retry", in->respawn_retry);
1584                 blobmsg_close_table(b, r);
1585         }
1586
1587         if (in->trace)
1588                 blobmsg_add_u8(b, "trace", true);
1589
1590         if (in->no_new_privs)
1591                 blobmsg_add_u8(b, "no_new_privs", true);
1592
1593         if (in->seccomp)
1594                 blobmsg_add_string(b, "seccomp", in->seccomp);
1595
1596         if (in->pidfile)
1597                 blobmsg_add_string(b, "pidfile", in->pidfile);
1598
1599         if (in->user)
1600                 blobmsg_add_string(b, "user", in->user);
1601
1602         if (in->group)
1603                 blobmsg_add_string(b, "group", in->group);
1604
1605         if (in->has_jail) {
1606                 void *r = blobmsg_open_table(b, "jail");
1607                 if (in->jail.name)
1608                         blobmsg_add_string(b, "name", in->jail.name);
1609                 if (!in->bundle) {
1610                         if (in->jail.hostname)
1611                                 blobmsg_add_string(b, "hostname", in->jail.hostname);
1612
1613                         blobmsg_add_u8(b, "procfs", in->jail.procfs);
1614                         blobmsg_add_u8(b, "sysfs", in->jail.sysfs);
1615                         blobmsg_add_u8(b, "ubus", in->jail.ubus);
1616                         blobmsg_add_u8(b, "log", in->jail.log);
1617                         blobmsg_add_u8(b, "ronly", in->jail.ronly);
1618                         blobmsg_add_u8(b, "netns", in->jail.netns);
1619                         blobmsg_add_u8(b, "userns", in->jail.userns);
1620                         blobmsg_add_u8(b, "cgroupsns", in->jail.cgroupsns);
1621                 } else {
1622                         blobmsg_add_u8(b, "immediately", in->immediately);
1623                 }
1624                 blobmsg_add_u8(b, "console", (in->console.fd.fd > -1));
1625                 blobmsg_close_table(b, r);
1626                 if (!avl_is_empty(&in->jail.mount.avl)) {
1627                         struct blobmsg_list_node *var;
1628                         void *e = blobmsg_open_table(b, "mount");
1629                         blobmsg_list_for_each(&in->jail.mount, var)
1630                                 blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
1631                         blobmsg_close_table(b, e);
1632                 }
1633         }
1634
1635         if (in->extroot)
1636                 blobmsg_add_string(b, "extroot", in->extroot);
1637         if (in->overlaydir)
1638                 blobmsg_add_string(b, "overlaydir", in->overlaydir);
1639         if (in->tmpoverlaysize)
1640                 blobmsg_add_string(b, "tmpoverlaysize", in->tmpoverlaysize);
1641
1642         if (verbose && in->trigger)
1643                 blobmsg_add_blob(b, in->trigger);
1644
1645         if (in->watchdog.mode != INSTANCE_WATCHDOG_MODE_DISABLED) {
1646                 void *r = blobmsg_open_table(b, "watchdog");
1647                 blobmsg_add_u32(b, "mode", in->watchdog.mode);
1648                 blobmsg_add_u32(b, "timeout", in->watchdog.freq);
1649                 blobmsg_close_table(b, r);
1650         }
1651
1652         blobmsg_close_table(b, i);
1653 }