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 #include <sys/resource.h>
  16 #include <sys/types.h>
  17 #include <sys/socket.h>
  18 #include <net/if.h>
  19 #include <unistd.h>
  20 #include <stdint.h>
  21 #include <fcntl.h>
  22
  23 #include <libubox/md5.h>
  24
  25 #include "../procd.h"
  26
  27 #include "service.h"
  28 #include "instance.h"
  29
  30
  31 enum {
  32         INSTANCE_ATTR_COMMAND,
  33         INSTANCE_ATTR_ENV,
  34         INSTANCE_ATTR_DATA,
  35         INSTANCE_ATTR_NETDEV,
  36         INSTANCE_ATTR_FILE,
  37         INSTANCE_ATTR_TRIGGER,
  38         INSTANCE_ATTR_RESPAWN,
  39         INSTANCE_ATTR_NICE,
  40         INSTANCE_ATTR_LIMITS,
  41         __INSTANCE_ATTR_MAX
  42 };
  43
  44 static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = {
  45         [INSTANCE_ATTR_COMMAND] = { "command", BLOBMSG_TYPE_ARRAY },
  46         [INSTANCE_ATTR_ENV] = { "env", BLOBMSG_TYPE_TABLE },
  47         [INSTANCE_ATTR_DATA] = { "data", BLOBMSG_TYPE_TABLE },
  48         [INSTANCE_ATTR_NETDEV] = { "netdev", BLOBMSG_TYPE_ARRAY },
  49         [INSTANCE_ATTR_FILE] = { "file", BLOBMSG_TYPE_ARRAY },
  50         [INSTANCE_ATTR_TRIGGER] = { "triggers", BLOBMSG_TYPE_ARRAY },
  51         [INSTANCE_ATTR_RESPAWN] = { "respawn", BLOBMSG_TYPE_ARRAY },
  52         [INSTANCE_ATTR_NICE] = { "nice", BLOBMSG_TYPE_INT32 },
  53         [INSTANCE_ATTR_LIMITS] = { "limits", BLOBMSG_TYPE_TABLE },
  54 };
  55
  56 struct instance_netdev {
  57         struct blobmsg_list_node node;
  58         int ifindex;
  59 };
  60
  61 struct instance_file {
  62         struct blobmsg_list_node node;
  63         uint32_t md5[4];
  64 };
  65
  66 struct rlimit_name {
  67         const char *name;
  68         int resource;
  69 };
  70
  71 static const struct rlimit_name rlimit_names[] = {
  72         { "as", RLIMIT_AS },
  73         { "core", RLIMIT_CORE },
  74         { "cpu", RLIMIT_CPU },
  75         { "data", RLIMIT_DATA },
  76         { "fsize", RLIMIT_FSIZE },
  77         { "memlock", RLIMIT_MEMLOCK },
  78         { "msgqueue", RLIMIT_MSGQUEUE },
  79         { "nice", RLIMIT_NICE },
  80         { "nofile", RLIMIT_NOFILE },
  81         { "nproc", RLIMIT_NPROC },
  82         { "rss", RLIMIT_RSS },
  83         { "rtprio", RLIMIT_RTPRIO },
  84         { "sigpending", RLIMIT_SIGPENDING },
  85         { "stack", RLIMIT_STACK },
  86         { NULL, 0 }
  87 };
  88
  89 static void
  90 instance_limits(const char *limit, const char *value)
  91 {
  92         int i;
  93         struct rlimit rlim;
  94         unsigned long cur, max;
  95
  96         for (i = 0; rlimit_names[i].name != NULL; i++) {
  97                 if (strcmp(rlimit_names[i].name, limit))
  98                         continue;
  99                 if (!strcmp(value, "unlimited")) {
 100                         rlim.rlim_cur = RLIM_INFINITY;
 101                         rlim.rlim_max = RLIM_INFINITY;
 102                 } else {
 103                         if (getrlimit(rlimit_names[i].resource, &rlim))
 104                                 return;
 105
 106                         cur = rlim.rlim_cur;
 107                         max = rlim.rlim_max;
 108
 109                         if (sscanf(value, "%lu %lu", &cur, &max) < 1)
 110                                 return;
 111
 112                         rlim.rlim_cur = cur;
 113                         rlim.rlim_max = max;
 114                 }
 115
 116                 setrlimit(rlimit_names[i].resource, &rlim);
 117                 return;
 118         }
 119 }
 120
 121 static void
 122 instance_run(struct service_instance *in)
 123 {
 124         struct blobmsg_list_node *var;
 125         struct blob_attr *cur;
 126         char **argv;
 127         int argc = 1; /* NULL terminated */
 128         int rem, fd;
 129
 130         if (in->nice)
 131                 setpriority(PRIO_PROCESS, 0, in->nice);
 132
 133         blobmsg_for_each_attr(cur, in->command, rem)
 134                 argc++;
 135
 136         blobmsg_list_for_each(&in->env, var)
 137                 setenv(blobmsg_name(var->data), blobmsg_data(var->data), 1);
 138
 139         blobmsg_list_for_each(&in->limits, var)
 140                 instance_limits(blobmsg_name(var->data), blobmsg_data(var->data));
 141
 142         argv = alloca(sizeof(char *) * argc);
 143         argc = 0;
 144
 145         blobmsg_for_each_attr(cur, in->command, rem)
 146                 argv[argc++] = blobmsg_data(cur);
 147
 148         argv[argc] = NULL;
 149         fd = open("/dev/null", O_RDWR);
 150         if (fd > -1) {
 151                 dup2(fd, STDIN_FILENO);
 152                 dup2(fd, STDOUT_FILENO);
 153                 dup2(fd, STDERR_FILENO);
 154                 if (fd > STDERR_FILENO)
 155                         close(fd);
 156         }
 157         execvp(argv[0], argv);
 158         exit(127);
 159 }
 160
 161 void
 162 instance_start(struct service_instance *in)
 163 {
 164         int pid;
 165
 166         if (in->proc.pending)
 167                 return;
 168
 169         in->restart = false;
 170         in->halt = !in->respawn;
 171
 172         if (!in->valid)
 173                 return;
 174
 175         pid = fork();
 176         if (pid < 0)
 177                 return;
 178
 179         if (!pid) {
 180                 uloop_done();
 181                 instance_run(in);
 182                 return;
 183         }
 184
 185         DEBUG(2, "Started instance %s::%s\n", in->srv->name, in->name);
 186         in->proc.pid = pid;
 187         clock_gettime(CLOCK_MONOTONIC, &in->start);
 188         uloop_process_add(&in->proc);
 189 }
 190
 191 static void
 192 instance_timeout(struct uloop_timeout *t)
 193 {
 194         struct service_instance *in;
 195
 196         in = container_of(t, struct service_instance, timeout);
 197
 198         if (!in->halt && (in->restart || in->respawn))
 199                 instance_start(in);
 200 }
 201
 202 static void
 203 instance_exit(struct uloop_process *p, int ret)
 204 {
 205         struct service_instance *in;
 206         struct timespec tp;
 207         long runtime;
 208
 209         in = container_of(p, struct service_instance, proc);
 210
 211         clock_gettime(CLOCK_MONOTONIC, &tp);
 212         runtime = tp.tv_sec - in->start.tv_sec;
 213
 214         DEBUG(2, "Instance %s::%s exit with error code %d after %ld seconds\n", in->srv->name, in->name, ret, runtime);
 215         if (upgrade_running)
 216                 return;
 217
 218         uloop_timeout_cancel(&in->timeout);
 219         if (in->halt) {
 220                 /* no action */
 221         } else if (in->restart) {
 222                 instance_start(in);
 223         } else if (in->respawn) {
 224                 if (runtime < in->respawn_threshold)
 225                         in->respawn_count++;
 226                 else
 227                         in->respawn_count = 0;
 228                 if (in->respawn_count > in->respawn_retry && in->respawn_retry > 0 ) {
 229                         LOG("Instance %s::%s s in a crash loop %d crashes, %ld seconds since last crash\n",
 230                                                                 in->srv->name, in->name, in->respawn_count, runtime);
 231                         in->restart = in->respawn = 0;
 232                         in->halt = 1;
 233                 } else {
 234                         uloop_timeout_set(&in->timeout, in->respawn_timeout * 1000);
 235                 }
 236         }
 237 }
 238
 239 void
 240 instance_stop(struct service_instance *in)
 241 {
 242         if (!in->proc.pending)
 243                 return;
 244         in->halt = true;
 245         in->restart = in->respawn = false;
 246         kill(in->proc.pid, SIGTERM);
 247 }
 248
 249 static void
 250 instance_restart(struct service_instance *in)
 251 {
 252         if (!in->proc.pending)
 253                 return;
 254         in->halt = false;
 255         in->restart = true;
 256         kill(in->proc.pid, SIGTERM);
 257 }
 258
 259 static bool
 260 instance_config_changed(struct service_instance *in, struct service_instance *in_new)
 261 {
 262         if (!in->valid)
 263                 return true;
 264
 265         if (!blob_attr_equal(in->command, in_new->command))
 266                 return true;
 267
 268         if (!blobmsg_list_equal(&in->env, &in_new->env))
 269                 return true;
 270
 271         if (!blobmsg_list_equal(&in->data, &in_new->data))
 272                 return true;
 273
 274         if (!blobmsg_list_equal(&in->netdev, &in_new->netdev))
 275                 return true;
 276
 277         if (!blobmsg_list_equal(&in->file, &in_new->file))
 278                 return true;
 279
 280         if (in->nice != in_new->nice)
 281                 return true;
 282
 283         if (!blobmsg_list_equal(&in->limits, &in_new->limits))
 284                 return true;
 285
 286         return false;
 287 }
 288
 289 static bool
 290 instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 291 {
 292         struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
 293         struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
 294
 295         return n1->ifindex == n2->ifindex;
 296 }
 297
 298 static void
 299 instance_netdev_update(struct blobmsg_list_node *l)
 300 {
 301         struct instance_netdev *n = container_of(l, struct instance_netdev, node);
 302
 303         n->ifindex = if_nametoindex(n->node.avl.key);
 304 }
 305
 306 static bool
 307 instance_file_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 308 {
 309         struct instance_file *f1 = container_of(l1, struct instance_file, node);
 310         struct instance_file *f2 = container_of(l2, struct instance_file, node);
 311
 312         return !memcmp(f1->md5, f2->md5, sizeof(f1->md5));
 313 }
 314
 315 static void
 316 instance_file_update(struct blobmsg_list_node *l)
 317 {
 318         struct instance_file *f = container_of(l, struct instance_file, node);
 319         md5_ctx_t md5;
 320         char buf[256];
 321         int len, fd;
 322
 323         memset(f->md5, 0, sizeof(f->md5));
 324
 325         fd = open(l->avl.key, O_RDONLY);
 326         if (fd < 0)
 327                 return;
 328
 329         md5_begin(&md5);
 330         do {
 331                 len = read(fd, buf, sizeof(buf));
 332                 if (len < 0) {
 333                         if (errno == EINTR)
 334                                 continue;
 335
 336                         break;
 337                 }
 338                 if (!len)
 339                         break;
 340
 341                 md5_hash(buf, len, &md5);
 342         } while(1);
 343
 344         md5_end(f->md5, &md5);
 345         close(fd);
 346 }
 347
 348 static bool
 349 instance_fill_array(struct blobmsg_list *l, struct blob_attr *cur, blobmsg_update_cb cb, bool array)
 350 {
 351         struct blobmsg_list_node *node;
 352
 353         if (!cur)
 354                 return true;
 355
 356         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 357                 return false;
 358
 359         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), array);
 360         if (cb) {
 361                 blobmsg_list_for_each(l, node)
 362                         cb(node);
 363         }
 364         return true;
 365 }
 366
 367 static bool
 368 instance_config_parse(struct service_instance *in)
 369 {
 370         struct blob_attr *tb[__INSTANCE_ATTR_MAX];
 371         struct blob_attr *cur, *cur2;
 372         int argc = 0;
 373         int rem;
 374
 375         blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
 376                 blobmsg_data(in->config), blobmsg_data_len(in->config));
 377
 378         cur = tb[INSTANCE_ATTR_COMMAND];
 379         if (!cur)
 380                 return false;
 381
 382         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 383                 return false;
 384
 385         blobmsg_for_each_attr(cur2, cur, rem) {
 386                 argc++;
 387                 break;
 388         }
 389         if (!argc)
 390                 return false;
 391
 392         in->command = cur;
 393
 394         if (tb[INSTANCE_ATTR_RESPAWN]) {
 395                 int i = 0;
 396                 uint32_t vals[3] = { 3600, 5, 5};
 397
 398                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_RESPAWN], rem) {
 399                         if ((i >= 3) && (blobmsg_type(cur2) == BLOBMSG_TYPE_STRING))
 400                                 continue;
 401                         vals[i] = atoi(blobmsg_get_string(cur2));
 402                         i++;
 403                 }
 404                 in->respawn = true;
 405                 in->respawn_count = 0;
 406                 in->respawn_threshold = vals[0];
 407                 in->respawn_timeout = vals[1];
 408                 in->respawn_retry = vals[2];
 409         }
 410         if (tb[INSTANCE_ATTR_TRIGGER]) {
 411                 in->trigger = blob_memdup(tb[INSTANCE_ATTR_TRIGGER]);
 412                 if (!in->trigger)
 413                         return -1;
 414                 trigger_add(in->trigger, in);
 415         }
 416
 417         if ((cur = tb[INSTANCE_ATTR_NICE])) {
 418                 in->nice = (int8_t) blobmsg_get_u32(cur);
 419                 if (in->nice < -20 || in->nice > 20)
 420                         return false;
 421         }
 422
 423         if (!instance_fill_array(&in->env, tb[INSTANCE_ATTR_ENV], NULL, false))
 424                 return false;
 425
 426         if (!instance_fill_array(&in->data, tb[INSTANCE_ATTR_DATA], NULL, false))
 427                 return false;
 428
 429         if (!instance_fill_array(&in->netdev, tb[INSTANCE_ATTR_NETDEV], instance_netdev_update, true))
 430                 return false;
 431
 432         if (!instance_fill_array(&in->file, tb[INSTANCE_ATTR_FILE], instance_file_update, true))
 433                 return false;
 434
 435         if (!instance_fill_array(&in->limits, tb[INSTANCE_ATTR_LIMITS], NULL, false))
 436                 return false;
 437
 438         return true;
 439 }
 440
 441 static void
 442 instance_config_cleanup(struct service_instance *in)
 443 {
 444         blobmsg_list_free(&in->env);
 445         blobmsg_list_free(&in->data);
 446         blobmsg_list_free(&in->netdev);
 447         blobmsg_list_free(&in->file);
 448         blobmsg_list_free(&in->limits);
 449 }
 450
 451 static void
 452 instance_config_move(struct service_instance *in, struct service_instance *in_src)
 453 {
 454         instance_config_cleanup(in);
 455         blobmsg_list_move(&in->env, &in_src->env);
 456         blobmsg_list_move(&in->data, &in_src->data);
 457         blobmsg_list_move(&in->netdev, &in_src->netdev);
 458         blobmsg_list_move(&in->file, &in_src->file);
 459         blobmsg_list_move(&in->limits, &in_src->limits);
 460         in->trigger = in_src->trigger;
 461         in->command = in_src->command;
 462         in->name = in_src->name;
 463         in->node.avl.key = in_src->node.avl.key;
 464
 465         free(in->config);
 466         in->config = in_src->config;
 467         in_src->config = NULL;
 468 }
 469
 470 bool
 471 instance_update(struct service_instance *in, struct service_instance *in_new)
 472 {
 473         bool changed = instance_config_changed(in, in_new);
 474         bool running = in->proc.pending;
 475
 476         if (!changed && running)
 477                 return false;
 478
 479         if (!running) {
 480                 if (changed)
 481                         instance_config_move(in, in_new);
 482                 instance_start(in);
 483         } else {
 484                 instance_restart(in);
 485                 instance_config_move(in, in_new);
 486                 /* restart happens in the child callback handler */
 487         }
 488         return true;
 489 }
 490
 491 void
 492 instance_free(struct service_instance *in)
 493 {
 494         uloop_process_delete(&in->proc);
 495         uloop_timeout_cancel(&in->timeout);
 496         trigger_del(in);
 497         free(in->trigger);
 498         instance_config_cleanup(in);
 499         free(in->config);
 500         free(in);
 501 }
 502
 503 void
 504 instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
 505 {
 506         config = blob_memdup(config);
 507         in->srv = s;
 508         in->name = blobmsg_name(config);
 509         in->config = config;
 510         in->timeout.cb = instance_timeout;
 511         in->proc.cb = instance_exit;
 512
 513         blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
 514         blobmsg_list_init(&in->file, struct instance_file, node, instance_file_cmp);
 515         blobmsg_list_simple_init(&in->env);
 516         blobmsg_list_simple_init(&in->data);
 517         blobmsg_list_simple_init(&in->limits);
 518         in->valid = instance_config_parse(in);
 519 }
 520
 521 void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
 522 {
 523         void *i;
 524
 525         i = blobmsg_open_table(b, in->name);
 526         blobmsg_add_u8(b, "running", in->proc.pending);
 527         if (in->proc.pending)
 528                 blobmsg_add_u32(b, "pid", in->proc.pid);
 529         blobmsg_add_blob(b, in->command);
 530
 531         if (!avl_is_empty(&in->env.avl)) {
 532                 struct blobmsg_list_node *var;
 533                 void *e = blobmsg_open_table(b, "env");
 534                 blobmsg_list_for_each(&in->env, var)
 535                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
 536                 blobmsg_close_table(b, e);
 537         }
 538
 539         if (!avl_is_empty(&in->limits.avl)) {
 540                 struct blobmsg_list_node *var;
 541                 void *e = blobmsg_open_table(b, "limits");
 542                 blobmsg_list_for_each(&in->limits, var)
 543                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
 544                 blobmsg_close_table(b, e);
 545         }
 546
 547         if (in->respawn) {
 548                 void *r = blobmsg_open_table(b, "respawn");
 549                 blobmsg_add_u32(b, "timeout", in->respawn_timeout);
 550                 blobmsg_add_u32(b, "threshold", in->respawn_threshold);
 551                 blobmsg_add_u32(b, "retry", in->respawn_retry);
 552                 blobmsg_close_table(b, r);
 553         }
 554
 555         if (verbose && in->trigger)
 556                 blobmsg_add_blob(b, in->trigger);
 557
 558         blobmsg_close_table(b, i);
 559 }