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 "procd.h"
  24 #include "service.h"
  25 #include "instance.h"
  26 #include "md5.h"
  27
  28 enum {
  29         INSTANCE_ATTR_COMMAND,
  30         INSTANCE_ATTR_ENV,
  31         INSTANCE_ATTR_DATA,
  32         INSTANCE_ATTR_NETDEV,
  33         INSTANCE_ATTR_FILE,
  34         INSTANCE_ATTR_TRIGGER,
  35         INSTANCE_ATTR_RESPAWN,
  36         INSTANCE_ATTR_NICE,
  37         __INSTANCE_ATTR_MAX
  38 };
  39
  40 static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = {
  41         [INSTANCE_ATTR_COMMAND] = { "command", BLOBMSG_TYPE_ARRAY },
  42         [INSTANCE_ATTR_ENV] = { "env", BLOBMSG_TYPE_TABLE },
  43         [INSTANCE_ATTR_DATA] = { "data", BLOBMSG_TYPE_TABLE },
  44         [INSTANCE_ATTR_NETDEV] = { "netdev", BLOBMSG_TYPE_ARRAY },
  45         [INSTANCE_ATTR_FILE] = { "file", BLOBMSG_TYPE_ARRAY },
  46         [INSTANCE_ATTR_TRIGGER] = { "triggers", BLOBMSG_TYPE_ARRAY },
  47         [INSTANCE_ATTR_RESPAWN] = { "respawn", BLOBMSG_TYPE_ARRAY },
  48         [INSTANCE_ATTR_NICE] = { "nice", BLOBMSG_TYPE_INT32 },
  49 };
  50
  51 struct instance_netdev {
  52         struct blobmsg_list_node node;
  53         int ifindex;
  54 };
  55
  56 struct instance_file {
  57         struct blobmsg_list_node node;
  58         uint32_t md5[4];
  59 };
  60
  61 static void
  62 instance_run(struct service_instance *in)
  63 {
  64         struct blobmsg_list_node *var;
  65         struct blob_attr *cur;
  66         char **argv;
  67         int argc = 1; /* NULL terminated */
  68         int rem, fd;
  69
  70         if (in->nice)
  71                 setpriority(PRIO_PROCESS, 0, in->nice);
  72
  73         blobmsg_for_each_attr(cur, in->command, rem)
  74                 argc++;
  75
  76         blobmsg_list_for_each(&in->env, var)
  77                 setenv(blobmsg_name(var->data), blobmsg_data(var->data), 1);
  78
  79         argv = alloca(sizeof(char *) * argc);
  80         argc = 0;
  81
  82         blobmsg_for_each_attr(cur, in->command, rem)
  83                 argv[argc++] = blobmsg_data(cur);
  84
  85         argv[argc] = NULL;
  86         fd = open("/dev/null", O_RDWR);
  87         if (fd > -1) {
  88                 dup2(fd, STDIN_FILENO);
  89                 dup2(fd, STDOUT_FILENO);
  90                 dup2(fd, STDERR_FILENO);
  91                 if (fd > STDERR_FILENO)
  92                         close(fd);
  93         }
  94         execvp(argv[0], argv);
  95         exit(127);
  96 }
  97
  98 void
  99 instance_start(struct service_instance *in)
 100 {
 101         int pid;
 102
 103         if (in->proc.pending)
 104                 return;
 105
 106         in->restart = false;
 107         in->halt = !in->respawn;
 108
 109         if (!in->valid)
 110                 return;
 111
 112         pid = fork();
 113         if (pid < 0)
 114                 return;
 115
 116         if (!pid) {
 117                 uloop_done();
 118                 instance_run(in);
 119                 return;
 120         }
 121
 122         DEBUG(1, "Started instance %s::%s\n", in->srv->name, in->name);
 123         in->proc.pid = pid;
 124         clock_gettime(CLOCK_MONOTONIC, &in->start);
 125         uloop_process_add(&in->proc);
 126 }
 127
 128 static void
 129 instance_timeout(struct uloop_timeout *t)
 130 {
 131         struct service_instance *in;
 132
 133         in = container_of(t, struct service_instance, timeout);
 134
 135         if (!in->halt && (in->restart || in->respawn))
 136                 instance_start(in);
 137 }
 138
 139 static void
 140 instance_exit(struct uloop_process *p, int ret)
 141 {
 142         struct service_instance *in;
 143         struct timespec tp;
 144         long runtime;
 145
 146         in = container_of(p, struct service_instance, proc);
 147
 148         clock_gettime(CLOCK_MONOTONIC, &tp);
 149         runtime = tp.tv_sec - in->start.tv_sec;
 150
 151         DEBUG(1, "Instance %s::%s exit with error code %d after %ld seconds\n", in->srv->name, in->name, ret, runtime);
 152         uloop_timeout_cancel(&in->timeout);
 153         if (in->halt) {
 154                 /* no action */
 155         } else if (in->restart) {
 156                 instance_start(in);
 157         } else if (in->respawn) {
 158                 if (runtime < in->respawn_threshold)
 159                         in->respawn_count++;
 160                 else
 161                         in->respawn_count = 0;
 162                 if (in->respawn_count > in->respawn_retry) {
 163                         LOG("Instance %s::%s s in a crash loop %d crashes, %ld seconds since last crash\n",
 164                                                                 in->srv->name, in->name, in->respawn_count, runtime);
 165                         in->restart = in->respawn = 0;
 166                         in->halt = 1;
 167                 } else {
 168                         uloop_timeout_set(&in->timeout, in->respawn_timeout * 1000);
 169                 }
 170         }
 171 }
 172
 173 void
 174 instance_stop(struct service_instance *in)
 175 {
 176         if (!in->proc.pending)
 177                 return;
 178         in->halt = true;
 179         in->restart = in->respawn = false;
 180         kill(in->proc.pid, SIGTERM);
 181 }
 182
 183 static void
 184 instance_restart(struct service_instance *in)
 185 {
 186         if (!in->proc.pending)
 187                 return;
 188         in->halt = false;
 189         in->restart = true;
 190         kill(in->proc.pid, SIGTERM);
 191 }
 192
 193 static bool
 194 instance_config_changed(struct service_instance *in, struct service_instance *in_new)
 195 {
 196         if (!in->valid)
 197                 return true;
 198
 199         if (!blob_attr_equal(in->command, in_new->command))
 200                 return true;
 201
 202         if (!blobmsg_list_equal(&in->env, &in_new->env))
 203                 return true;
 204
 205         if (!blobmsg_list_equal(&in->data, &in_new->data))
 206                 return true;
 207
 208         if (!blobmsg_list_equal(&in->netdev, &in_new->netdev))
 209                 return true;
 210
 211         if (!blobmsg_list_equal(&in->file, &in_new->file))
 212                 return true;
 213
 214         if (in->nice != in_new->nice)
 215                 return true;
 216
 217         return false;
 218 }
 219
 220 static bool
 221 instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 222 {
 223         struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
 224         struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
 225
 226         return n1->ifindex == n2->ifindex;
 227 }
 228
 229 static void
 230 instance_netdev_update(struct blobmsg_list_node *l)
 231 {
 232         struct instance_netdev *n = container_of(l, struct instance_netdev, node);
 233
 234         n->ifindex = if_nametoindex(n->node.avl.key);
 235 }
 236
 237 static bool
 238 instance_file_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 239 {
 240         struct instance_file *f1 = container_of(l1, struct instance_file, node);
 241         struct instance_file *f2 = container_of(l2, struct instance_file, node);
 242
 243         return !memcmp(f1->md5, f2->md5, sizeof(f1->md5));
 244 }
 245
 246 static void
 247 instance_file_update(struct blobmsg_list_node *l)
 248 {
 249         struct instance_file *f = container_of(l, struct instance_file, node);
 250         md5_ctx_t md5;
 251         char buf[256];
 252         int len, fd;
 253
 254         memset(f->md5, 0, sizeof(f->md5));
 255
 256         fd = open(l->avl.key, O_RDONLY);
 257         if (fd < 0)
 258                 return;
 259
 260         md5_begin(&md5);
 261         do {
 262                 len = read(fd, buf, sizeof(buf));
 263                 if (len < 0) {
 264                         if (errno == EINTR)
 265                                 continue;
 266
 267                         break;
 268                 }
 269                 if (!len)
 270                         break;
 271
 272                 md5_hash(buf, len, &md5);
 273         } while(1);
 274
 275         md5_end(f->md5, &md5);
 276         close(fd);
 277 }
 278
 279 static bool
 280 instance_fill_array(struct blobmsg_list *l, struct blob_attr *cur, blobmsg_update_cb cb, bool array)
 281 {
 282         struct blobmsg_list_node *node;
 283
 284         if (!cur)
 285                 return true;
 286
 287         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 288                 return false;
 289
 290         blobmsg_list_fill(l, blobmsg_data(cur), blobmsg_data_len(cur), array);
 291         if (cb) {
 292                 blobmsg_list_for_each(l, node)
 293                         cb(node);
 294         }
 295         return true;
 296 }
 297
 298 static bool
 299 instance_config_parse(struct service_instance *in)
 300 {
 301         struct blob_attr *tb[__INSTANCE_ATTR_MAX];
 302         struct blob_attr *cur, *cur2;
 303         int argc = 0;
 304         int rem;
 305
 306         blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
 307                 blobmsg_data(in->config), blobmsg_data_len(in->config));
 308
 309         cur = tb[INSTANCE_ATTR_COMMAND];
 310         if (!cur)
 311                 return false;
 312
 313         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 314                 return false;
 315
 316         blobmsg_for_each_attr(cur2, cur, rem) {
 317                 argc++;
 318                 break;
 319         }
 320         if (!argc)
 321                 return false;
 322
 323         in->command = cur;
 324
 325         if (tb[INSTANCE_ATTR_RESPAWN]) {
 326                 int i = 0;
 327                 uint32_t vals[3] = { 3600, 5, 5};
 328
 329                 blobmsg_for_each_attr(cur2, tb[INSTANCE_ATTR_RESPAWN], rem) {
 330                         if ((i >= 3) && (blobmsg_type(cur2) == BLOBMSG_TYPE_STRING))
 331                                 continue;
 332                         vals[i] = atoi(blobmsg_get_string(cur2));
 333                         i++;
 334                 }
 335                 in->respawn = true;
 336                 in->respawn_count = 0;
 337                 in->respawn_timeout = vals[0];
 338                 in->respawn_threshold = vals[1];
 339                 in->respawn_retry = vals[2];
 340         }
 341         if (tb[INSTANCE_ATTR_TRIGGER]) {
 342                 in->trigger = malloc(blob_pad_len(tb[INSTANCE_ATTR_TRIGGER]));
 343                 if (!in->trigger)
 344                         return -1;
 345                 memcpy(in->trigger, tb[INSTANCE_ATTR_TRIGGER], blob_pad_len(tb[INSTANCE_ATTR_TRIGGER]));
 346                 trigger_add(in->trigger, in);
 347         }
 348
 349         if ((cur = tb[INSTANCE_ATTR_NICE])) {
 350                 in->nice = (int8_t) blobmsg_get_u32(cur);
 351                 if (in->nice < -20 || in->nice > 20)
 352                         return false;
 353         }
 354
 355         if (!instance_fill_array(&in->env, tb[INSTANCE_ATTR_ENV], NULL, false))
 356                 return false;
 357
 358         if (!instance_fill_array(&in->data, tb[INSTANCE_ATTR_DATA], NULL, false))
 359                 return false;
 360
 361         if (!instance_fill_array(&in->netdev, tb[INSTANCE_ATTR_NETDEV], instance_netdev_update, true))
 362                 return false;
 363
 364         if (!instance_fill_array(&in->file, tb[INSTANCE_ATTR_FILE], instance_file_update, true))
 365                 return false;
 366
 367         return true;
 368 }
 369
 370 static void
 371 instance_config_cleanup(struct service_instance *in)
 372 {
 373         blobmsg_list_free(&in->env);
 374         blobmsg_list_free(&in->data);
 375         blobmsg_list_free(&in->netdev);
 376 }
 377
 378 static void
 379 instance_config_move(struct service_instance *in, struct service_instance *in_src)
 380 {
 381         instance_config_cleanup(in);
 382         blobmsg_list_move(&in->env, &in_src->env);
 383         blobmsg_list_move(&in->data, &in_src->data);
 384         blobmsg_list_move(&in->netdev, &in_src->netdev);
 385         in->trigger = in_src->trigger;
 386         in->command = in_src->command;
 387         in->name = in_src->name;
 388         in->node.avl.key = in_src->node.avl.key;
 389
 390         free(in->config);
 391         in->config = in_src->config;
 392         in_src->config = NULL;
 393 }
 394
 395 bool
 396 instance_update(struct service_instance *in, struct service_instance *in_new)
 397 {
 398         bool changed = instance_config_changed(in, in_new);
 399         bool running = in->proc.pending;
 400
 401         if (!changed && running)
 402                 return false;
 403
 404         if (!running) {
 405                 if (changed)
 406                         instance_config_move(in, in_new);
 407                 instance_start(in);
 408         } else {
 409                 instance_restart(in);
 410                 instance_config_move(in, in_new);
 411                 /* restart happens in the child callback handler */
 412         }
 413         return true;
 414 }
 415
 416 void
 417 instance_free(struct service_instance *in)
 418 {
 419         uloop_process_delete(&in->proc);
 420         uloop_timeout_cancel(&in->timeout);
 421         trigger_del(in);
 422         free(in->trigger);
 423         instance_config_cleanup(in);
 424         free(in->config);
 425         free(in);
 426 }
 427
 428 void
 429 instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
 430 {
 431         config = blob_memdup(config);
 432         in->srv = s;
 433         in->name = blobmsg_name(config);
 434         in->config = config;
 435         in->timeout.cb = instance_timeout;
 436         in->proc.cb = instance_exit;
 437
 438         blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
 439         blobmsg_list_init(&in->file, struct instance_file, node, instance_file_cmp);
 440         blobmsg_list_simple_init(&in->env);
 441         blobmsg_list_simple_init(&in->data);
 442         in->valid = instance_config_parse(in);
 443 }
 444
 445 void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
 446 {
 447         void *i;
 448         struct pid_info pi;
 449
 450         i = blobmsg_open_table(b, in->name);
 451         blobmsg_add_u8(b, "running", in->proc.pending);
 452         if (in->proc.pending)
 453                 blobmsg_add_u32(b, "pid", in->proc.pid);
 454         blobmsg_add_blob(b, in->command);
 455
 456         if (!avl_is_empty(&in->env.avl)) {
 457                 struct blobmsg_list_node *var;
 458                 void *e = blobmsg_open_table(b, "env");
 459                 blobmsg_list_for_each(&in->env, var)
 460                         blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
 461                 blobmsg_close_table(b, e);
 462         }
 463
 464         if (in->respawn) {
 465                 void *r = blobmsg_open_table(b, "respawn");
 466                 blobmsg_add_u32(b, "timeout", in->respawn_timeout);
 467                 blobmsg_add_u32(b, "threshold", in->respawn_threshold);
 468                 blobmsg_add_u32(b, "retry", in->respawn_retry);
 469                 blobmsg_close_table(b, r);
 470         }
 471
 472         if (verbose && in->trigger)
 473                 blobmsg_add_blob(b, in->trigger);
 474         if (!measure_process(in->proc.pid, &pi)) {
 475                 struct timespec tp;
 476                 long uptime;
 477
 478                 clock_gettime(CLOCK_MONOTONIC, &tp);
 479                 uptime = tp.tv_sec - in->start.tv_sec;
 480
 481                 blobmsg_add_u8(b, "ppid", pi.ppid);
 482                 blobmsg_add_u16(b, "uid", pi.uid);
 483                 blobmsg_add_u32(b, "fdcount", pi.fdcount);
 484                 blobmsg_add_u32(b, "vmsize", pi.vmsize);
 485                 blobmsg_add_u32(b, "uptime", uptime);
 486         }
 487         blobmsg_close_table(b, i);
 488 }