service/service.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 <libubox/blobmsg_json.h>
  16 #include <libubox/avl-cmp.h>
  17
  18 #include "../procd.h"
  19
  20 #include "service.h"
  21 #include "instance.h"
  22
  23 #include "../rcS.h"
  24
  25 AVL_TREE(services, avl_strcmp, false, NULL);
  26 static struct blob_buf b;
  27 static struct ubus_context *ctx;
  28
  29 static void
  30 service_instance_add(struct service *s, struct blob_attr *attr)
  31 {
  32         struct service_instance *in;
  33
  34         if (blobmsg_type(attr) != BLOBMSG_TYPE_TABLE)
  35                 return;
  36
  37         in = calloc(1, sizeof(*in));
  38         if (!in)
  39                 return;
  40
  41         instance_init(in, s, attr);
  42         vlist_add(&s->instances, &in->node, (void *) in->name);
  43 }
  44
  45 static void
  46 service_instance_update(struct vlist_tree *tree, struct vlist_node *node_new,
  47                         struct vlist_node *node_old)
  48 {
  49         struct service_instance *in_o = NULL, *in_n = NULL;
  50
  51         if (node_old)
  52                 in_o = container_of(node_old, struct service_instance, node);
  53
  54         if (node_new)
  55                 in_n = container_of(node_new, struct service_instance, node);
  56
  57         if (in_o && in_n) {
  58                 DEBUG(2, "Update instance %s::%s\n", in_o->srv->name, in_o->name);
  59                 instance_update(in_o, in_n);
  60                 instance_free(in_n);
  61         } else if (in_o) {
  62                 DEBUG(2, "Free instance %s::%s\n", in_o->srv->name, in_o->name);
  63                 instance_stop(in_o);
  64                 instance_free(in_o);
  65         } else if (in_n) {
  66                 DEBUG(2, "Create instance %s::%s\n", in_n->srv->name, in_n->name);
  67                 instance_start(in_n);
  68         }
  69         blob_buf_init(&b, 0);
  70         trigger_event("instance.update", b.head);
  71 }
  72
  73 static struct service *
  74 service_alloc(const char *name)
  75 {
  76         struct service *s;
  77         char *new_name;
  78
  79         s = calloc_a(sizeof(*s), &new_name, strlen(name) + 1);
  80         strcpy(new_name, name);
  81
  82         vlist_init(&s->instances, avl_strcmp, service_instance_update);
  83         s->instances.keep_old = true;
  84         s->name = new_name;
  85         s->avl.key = s->name;
  86         INIT_LIST_HEAD(&s->validators);
  87
  88         return s;
  89 }
  90
  91 enum {
  92         SERVICE_SET_NAME,
  93         SERVICE_SET_SCRIPT,
  94         SERVICE_SET_INSTANCES,
  95         SERVICE_SET_TRIGGER,
  96         SERVICE_SET_VALIDATE,
  97         __SERVICE_SET_MAX
  98 };
  99
 100 static const struct blobmsg_policy service_set_attrs[__SERVICE_SET_MAX] = {
 101         [SERVICE_SET_NAME] = { "name", BLOBMSG_TYPE_STRING },
 102         [SERVICE_SET_SCRIPT] = { "script", BLOBMSG_TYPE_STRING },
 103         [SERVICE_SET_INSTANCES] = { "instances", BLOBMSG_TYPE_TABLE },
 104         [SERVICE_SET_TRIGGER] = { "triggers", BLOBMSG_TYPE_ARRAY },
 105         [SERVICE_SET_VALIDATE] = { "validate", BLOBMSG_TYPE_ARRAY },
 106 };
 107
 108 static int
 109 service_update(struct service *s, struct blob_attr **tb, bool add)
 110 {
 111         struct blob_attr *cur;
 112         int rem;
 113
 114         if (s->trigger) {
 115                 trigger_del(s);
 116                 free(s->trigger);
 117                 s->trigger = NULL;
 118         }
 119
 120         service_validate_del(s);
 121
 122         if (tb[SERVICE_SET_TRIGGER] && blobmsg_data_len(tb[SERVICE_SET_TRIGGER])) {
 123                 s->trigger = blob_memdup(tb[SERVICE_SET_TRIGGER]);
 124                 if (!s->trigger)
 125                         return -1;
 126                 trigger_add(s->trigger, s);
 127         }
 128
 129         if (tb[SERVICE_SET_VALIDATE] && blobmsg_data_len(tb[SERVICE_SET_VALIDATE])) {
 130                 blobmsg_for_each_attr(cur, tb[SERVICE_SET_VALIDATE], rem)
 131                         service_validate_add(s, cur);
 132         }
 133
 134         if (tb[SERVICE_SET_INSTANCES]) {
 135                 if (!add)
 136                         vlist_update(&s->instances);
 137                 blobmsg_for_each_attr(cur, tb[SERVICE_SET_INSTANCES], rem) {
 138                         service_instance_add(s, cur);
 139                 }
 140                 if (!add)
 141                         vlist_flush(&s->instances);
 142         }
 143
 144         rc(s->name, "running");
 145
 146         return 0;
 147 }
 148
 149 static void
 150 service_delete(struct service *s)
 151 {
 152         service_event("service.stop", s->name, NULL);
 153         vlist_flush_all(&s->instances);
 154         avl_delete(&services, &s->avl);
 155         trigger_del(s);
 156         free(s->trigger);
 157         free(s);
 158         service_validate_del(s);
 159 }
 160
 161 enum {
 162         SERVICE_ATTR_NAME,
 163         __SERVICE_ATTR_MAX,
 164 };
 165
 166 static const struct blobmsg_policy service_attrs[__SERVICE_ATTR_MAX] = {
 167         [SERVICE_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 168 };
 169
 170 enum {
 171         SERVICE_DEL_ATTR_NAME,
 172         SERVICE_DEL_ATTR_INSTANCE,
 173         __SERVICE_DEL_ATTR_MAX,
 174 };
 175
 176 static const struct blobmsg_policy service_del_attrs[__SERVICE_DEL_ATTR_MAX] = {
 177         [SERVICE_DEL_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 178         [SERVICE_DEL_ATTR_INSTANCE] = { "instance", BLOBMSG_TYPE_STRING },
 179 };
 180
 181 enum {
 182         SERVICE_LIST_ATTR_NAME,
 183         SERVICE_LIST_ATTR_VERBOSE,
 184         __SERVICE_LIST_ATTR_MAX,
 185 };
 186
 187 static const struct blobmsg_policy service_list_attrs[__SERVICE_LIST_ATTR_MAX] = {
 188         [SERVICE_LIST_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 189         [SERVICE_LIST_ATTR_VERBOSE] = { "verbose", BLOBMSG_TYPE_BOOL },
 190 };
 191
 192 enum {
 193         SERVICE_SIGNAL_ATTR_NAME,
 194         SERVICE_SIGNAL_ATTR_INSTANCE,
 195         SERVICE_SIGNAL_ATTR_SIGNAL,
 196         __SERVICE_SIGNAL_ATTR_MAX,
 197 };
 198
 199 static const struct blobmsg_policy service_signal_attrs[__SERVICE_SIGNAL_ATTR_MAX] = {
 200         [SERVICE_SIGNAL_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
 201         [SERVICE_SIGNAL_ATTR_INSTANCE] = { "instance", BLOBMSG_TYPE_STRING },
 202         [SERVICE_SIGNAL_ATTR_SIGNAL] = { "signal", BLOBMSG_TYPE_INT32 },
 203 };
 204
 205 enum {
 206         EVENT_TYPE,
 207         EVENT_DATA,
 208         __EVENT_MAX
 209 };
 210
 211 static const struct blobmsg_policy event_policy[__EVENT_MAX] = {
 212         [EVENT_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
 213         [EVENT_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
 214 };
 215
 216 enum {
 217         VALIDATE_PACKAGE,
 218         VALIDATE_TYPE,
 219         VALIDATE_SERVICE,
 220         __VALIDATE_MAX
 221 };
 222
 223 static const struct blobmsg_policy validate_policy[__VALIDATE_MAX] = {
 224         [VALIDATE_PACKAGE] = { .name = "package", .type = BLOBMSG_TYPE_STRING },
 225         [VALIDATE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
 226         [VALIDATE_SERVICE] = { .name = "service", .type = BLOBMSG_TYPE_STRING },
 227 };
 228
 229 enum {
 230         DATA_NAME,
 231         DATA_INSTANCE,
 232         DATA_TYPE,
 233         __DATA_MAX
 234 };
 235
 236 static const struct blobmsg_policy get_data_policy[] = {
 237         [DATA_NAME] = { "name", BLOBMSG_TYPE_STRING },
 238         [DATA_INSTANCE] = { "instance", BLOBMSG_TYPE_STRING },
 239         [DATA_TYPE] = { "type", BLOBMSG_TYPE_STRING },
 240 };
 241
 242 static int
 243 service_handle_set(struct ubus_context *ctx, struct ubus_object *obj,
 244                    struct ubus_request_data *req, const char *method,
 245                    struct blob_attr *msg)
 246 {
 247         struct blob_attr *tb[__SERVICE_SET_MAX], *cur;
 248         struct service *s = NULL;
 249         const char *name;
 250         bool add = !strcmp(method, "add");
 251         int ret;
 252
 253         blobmsg_parse(service_set_attrs, __SERVICE_SET_MAX, tb, blob_data(msg), blob_len(msg));
 254         cur = tb[SERVICE_ATTR_NAME];
 255         if (!cur)
 256                 return UBUS_STATUS_INVALID_ARGUMENT;
 257
 258         name = blobmsg_data(cur);
 259
 260         s = avl_find_element(&services, name, s, avl);
 261         if (s) {
 262                 DEBUG(2, "Update service %s\n", name);
 263                 return service_update(s, tb, add);
 264         }
 265
 266         DEBUG(2, "Create service %s\n", name);
 267         s = service_alloc(name);
 268         if (!s)
 269                 return UBUS_STATUS_UNKNOWN_ERROR;
 270
 271         ret = service_update(s, tb, add);
 272         if (ret)
 273                 return ret;
 274
 275         avl_insert(&services, &s->avl);
 276
 277         service_event("service.start", s->name, NULL);
 278
 279         return 0;
 280 }
 281
 282 static void
 283 service_dump(struct service *s, bool verbose)
 284 {
 285         struct service_instance *in;
 286         void *c, *i;
 287
 288         c = blobmsg_open_table(&b, s->name);
 289
 290         if (!avl_is_empty(&s->instances.avl)) {
 291                 i = blobmsg_open_table(&b, "instances");
 292                 vlist_for_each_element(&s->instances, in, node)
 293                         instance_dump(&b, in, verbose);
 294                 blobmsg_close_table(&b, i);
 295         }
 296         if (verbose && s->trigger)
 297                 blobmsg_add_blob(&b, s->trigger);
 298         if (verbose && !list_empty(&s->validators))
 299                 service_validate_dump(&b, s);
 300         blobmsg_close_table(&b, c);
 301 }
 302
 303 static int
 304 service_handle_list(struct ubus_context *ctx, struct ubus_object *obj,
 305                     struct ubus_request_data *req, const char *method,
 306                     struct blob_attr *msg)
 307 {
 308         struct blob_attr *tb[__SERVICE_LIST_ATTR_MAX];
 309         struct service *s;
 310         const char *name = NULL;
 311         bool verbose = false;
 312
 313         blobmsg_parse(service_list_attrs, __SERVICE_LIST_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 314
 315         if (tb[SERVICE_LIST_ATTR_VERBOSE])
 316                 verbose = blobmsg_get_bool(tb[SERVICE_LIST_ATTR_VERBOSE]);
 317         if (tb[SERVICE_LIST_ATTR_NAME])
 318                 name = blobmsg_get_string(tb[SERVICE_LIST_ATTR_NAME]);
 319
 320         blob_buf_init(&b, 0);
 321         avl_for_each_element(&services, s, avl) {
 322                 if (name && strcmp(s->name, name) != 0)
 323                         continue;
 324
 325                 service_dump(s, verbose);
 326         }
 327
 328         ubus_send_reply(ctx, req, b.head);
 329
 330         return 0;
 331 }
 332
 333 static int
 334 service_handle_delete(struct ubus_context *ctx, struct ubus_object *obj,
 335                     struct ubus_request_data *req, const char *method,
 336                     struct blob_attr *msg)
 337 {
 338         struct blob_attr *tb[__SERVICE_DEL_ATTR_MAX], *cur;
 339         struct service *s;
 340         struct service_instance *in;
 341
 342         blobmsg_parse(service_del_attrs, __SERVICE_DEL_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 343
 344         cur = tb[SERVICE_DEL_ATTR_NAME];
 345         if (!cur)
 346                 return UBUS_STATUS_NOT_FOUND;
 347
 348         s = avl_find_element(&services, blobmsg_data(cur), s, avl);
 349         if (!s)
 350                 return UBUS_STATUS_NOT_FOUND;
 351
 352         cur = tb[SERVICE_DEL_ATTR_INSTANCE];
 353         if (!cur) {
 354                 service_delete(s);
 355                 return 0;
 356         }
 357
 358         in = vlist_find(&s->instances, blobmsg_data(cur), in, node);
 359         if (!in) {
 360                 ERROR("instance %s not found\n", (char *) blobmsg_data(cur));
 361                 return UBUS_STATUS_NOT_FOUND;
 362         }
 363
 364         vlist_delete(&s->instances, &in->node);
 365
 366         return 0;
 367 }
 368
 369 static int
 370 service_handle_kill(struct service_instance *in, int sig)
 371 {
 372         if (kill(in->proc.pid, sig) == 0)
 373                 return 0;
 374
 375         switch (errno) {
 376         case EINVAL: return UBUS_STATUS_INVALID_ARGUMENT;
 377         case EPERM:  return UBUS_STATUS_PERMISSION_DENIED;
 378         case ESRCH:  return UBUS_STATUS_NOT_FOUND;
 379         }
 380
 381         return UBUS_STATUS_UNKNOWN_ERROR;
 382 }
 383
 384 static int
 385 service_handle_signal(struct ubus_context *ctx, struct ubus_object *obj,
 386                     struct ubus_request_data *req, const char *method,
 387                     struct blob_attr *msg)
 388 {
 389         struct blob_attr *tb[__SERVICE_SIGNAL_ATTR_MAX], *cur;
 390         struct service *s;
 391         struct service_instance *in;
 392         int sig = SIGHUP;
 393         int rv = 0;
 394
 395         blobmsg_parse(service_signal_attrs, __SERVICE_SIGNAL_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 396
 397         cur = tb[SERVICE_SIGNAL_ATTR_SIGNAL];
 398         if (cur)
 399                 sig = blobmsg_get_u32(cur);
 400
 401         cur = tb[SERVICE_SIGNAL_ATTR_NAME];
 402         if (!cur)
 403                 return UBUS_STATUS_NOT_FOUND;
 404
 405         s = avl_find_element(&services, blobmsg_data(cur), s, avl);
 406         if (!s)
 407                 return UBUS_STATUS_NOT_FOUND;
 408
 409         cur = tb[SERVICE_SIGNAL_ATTR_INSTANCE];
 410         if (!cur) {
 411                 vlist_for_each_element(&s->instances, in, node)
 412                         rv = service_handle_kill(in, sig);
 413
 414                 return rv;
 415         }
 416
 417         in = vlist_find(&s->instances, blobmsg_data(cur), in, node);
 418         if (!in) {
 419                 ERROR("instance %s not found\n", blobmsg_get_string(cur));
 420                 return UBUS_STATUS_NOT_FOUND;
 421         }
 422
 423         return service_handle_kill(in, sig);
 424 }
 425
 426 static int
 427 service_handle_update(struct ubus_context *ctx, struct ubus_object *obj,
 428                       struct ubus_request_data *req, const char *method,
 429                       struct blob_attr *msg)
 430 {
 431         struct blob_attr *tb[__SERVICE_ATTR_MAX], *cur;
 432         struct service *s;
 433
 434         blobmsg_parse(service_attrs, __SERVICE_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 435
 436         cur = tb[SERVICE_SET_NAME];
 437         if (!cur)
 438                 return UBUS_STATUS_INVALID_ARGUMENT;
 439
 440         s = avl_find_element(&services, blobmsg_data(cur), s, avl);
 441         if (!s)
 442                 return UBUS_STATUS_NOT_FOUND;
 443
 444         if (!strcmp(method, "update_start"))
 445                 vlist_update(&s->instances);
 446         else
 447                 vlist_flush(&s->instances);
 448
 449         return 0;
 450 }
 451
 452 static int
 453 service_handle_event(struct ubus_context *ctx, struct ubus_object *obj,
 454                         struct ubus_request_data *req, const char *method,
 455                         struct blob_attr *msg)
 456 {
 457         struct blob_attr *tb[__EVENT_MAX];
 458
 459         if (!msg)
 460                 return UBUS_STATUS_INVALID_ARGUMENT;
 461
 462         blobmsg_parse(event_policy, __EVENT_MAX, tb, blob_data(msg), blob_len(msg));
 463         if (!tb[EVENT_TYPE] || !tb[EVENT_DATA])
 464                 return UBUS_STATUS_INVALID_ARGUMENT;
 465
 466         trigger_event(blobmsg_get_string(tb[EVENT_TYPE]), tb[EVENT_DATA]);
 467
 468         return 0;
 469 }
 470
 471 static int
 472 service_handle_validate(struct ubus_context *ctx, struct ubus_object *obj,
 473                         struct ubus_request_data *req, const char *method,
 474                         struct blob_attr *msg)
 475 {
 476         struct blob_attr *tb[__VALIDATE_MAX];
 477         char *p = NULL, *t = NULL;
 478
 479         if (!msg)
 480                 return UBUS_STATUS_INVALID_ARGUMENT;
 481
 482         blobmsg_parse(validate_policy, __VALIDATE_MAX, tb, blob_data(msg), blob_len(msg));
 483         if (tb[VALIDATE_SERVICE]) {
 484                 return 0;
 485         }
 486         if (tb[VALIDATE_PACKAGE])
 487                 p = blobmsg_get_string(tb[VALIDATE_PACKAGE]);
 488
 489         if (tb[VALIDATE_TYPE])
 490                 t = blobmsg_get_string(tb[VALIDATE_TYPE]);
 491
 492         blob_buf_init(&b, 0);
 493         service_validate_dump_all(&b, p, t);
 494         ubus_send_reply(ctx, req, b.head);
 495
 496         return 0;
 497 }
 498
 499 static int
 500 service_get_data(struct ubus_context *ctx, struct ubus_object *obj,
 501                  struct ubus_request_data *req, const char *method,
 502                  struct blob_attr *msg)
 503 {
 504         struct service_instance *in;
 505         struct service *s;
 506         struct blob_attr *tb[__DATA_MAX];
 507         const char *name = NULL;
 508         const char *instance = NULL;
 509         const char *type = NULL;
 510
 511         blobmsg_parse(get_data_policy, __DATA_MAX, tb, blob_data(msg), blob_len(msg));
 512         if (tb[DATA_NAME])
 513                 name = blobmsg_data(tb[DATA_NAME]);
 514         if (tb[DATA_INSTANCE])
 515                 instance = blobmsg_data(tb[DATA_INSTANCE]);
 516         if (tb[DATA_TYPE])
 517                 type = blobmsg_data(tb[DATA_TYPE]);
 518
 519         blob_buf_init(&b, 0);
 520         avl_for_each_element(&services, s, avl) {
 521                 void *cs = NULL;
 522
 523                 if (name && strcmp(name, s->name))
 524                         continue;
 525
 526                 vlist_for_each_element(&s->instances, in, node) {
 527                         struct blobmsg_list_node *var;
 528                         void *ci = NULL;
 529
 530                         if (instance && strcmp(instance, in->name))
 531                                 continue;
 532
 533                         blobmsg_list_for_each(&in->data, var) {
 534                                 if (type &&
 535                                     strcmp(blobmsg_name(var->data), type))
 536                                         continue;
 537
 538                                 if (!cs)
 539                                         cs = blobmsg_open_table(&b, s->name);
 540                                 if (!ci)
 541                                         ci = blobmsg_open_table(&b, in->name);
 542
 543                                 blobmsg_add_blob(&b, var->data);
 544                         }
 545
 546                         if (ci)
 547                                 blobmsg_close_table(&b, ci);
 548                 }
 549
 550                 if (cs)
 551                         blobmsg_close_table(&b, cs);
 552         }
 553
 554         ubus_send_reply(ctx, req, b.head);
 555         return 0;
 556 }
 557
 558 static struct ubus_method main_object_methods[] = {
 559         UBUS_METHOD("set", service_handle_set, service_set_attrs),
 560         UBUS_METHOD("add", service_handle_set, service_set_attrs),
 561         UBUS_METHOD("list", service_handle_list, service_list_attrs),
 562         UBUS_METHOD("delete", service_handle_delete, service_del_attrs),
 563         UBUS_METHOD("signal", service_handle_signal, service_signal_attrs),
 564         UBUS_METHOD("update_start", service_handle_update, service_attrs),
 565         UBUS_METHOD("update_complete", service_handle_update, service_attrs),
 566         UBUS_METHOD("event", service_handle_event, event_policy),
 567         UBUS_METHOD("validate", service_handle_validate, validate_policy),
 568         UBUS_METHOD("get_data", service_get_data, get_data_policy),
 569 };
 570
 571 static struct ubus_object_type main_object_type =
 572         UBUS_OBJECT_TYPE("service", main_object_methods);
 573
 574 static struct ubus_object main_object = {
 575         .name = "service",
 576         .type = &main_object_type,
 577         .methods = main_object_methods,
 578         .n_methods = ARRAY_SIZE(main_object_methods),
 579 };
 580
 581 int
 582 service_start_early(char *name, char *cmdline)
 583 {
 584         void *instances, *instance, *command, *respawn;
 585         char *t;
 586
 587         blob_buf_init(&b, 0);
 588         blobmsg_add_string(&b, "name", name);
 589         instances = blobmsg_open_table(&b, "instances");
 590         instance = blobmsg_open_table(&b, "instance1");
 591         command = blobmsg_open_array(&b, "command");
 592         t = strtok(cmdline, " ");
 593         while (t) {
 594                 blobmsg_add_string(&b, NULL, t);
 595                 t = strtok(NULL, " ");
 596         }
 597         blobmsg_close_array(&b, command);
 598         respawn = blobmsg_open_array(&b, "respawn");
 599         blobmsg_add_string(&b, NULL, "3600");
 600         blobmsg_add_string(&b, NULL, "1");
 601         blobmsg_add_string(&b, NULL, "0");
 602         blobmsg_close_array(&b, respawn);
 603         blobmsg_close_table(&b, instance);
 604         blobmsg_close_table(&b, instances);
 605
 606         return service_handle_set(NULL, NULL, NULL, "add", b.head);
 607 }
 608
 609 void service_event(const char *type, const char *service, const char *instance)
 610 {
 611         if (!ctx)
 612                 return;
 613
 614         blob_buf_init(&b, 0);
 615         blobmsg_add_string(&b, "service", service);
 616         if (instance)
 617                 blobmsg_add_string(&b, "instance", instance);
 618         ubus_notify(ctx, &main_object, type, b.head, -1);
 619 }
 620
 621 void ubus_init_service(struct ubus_context *_ctx)
 622 {
 623         ctx = _ctx;
 624         ubus_add_object(ctx, &main_object);
 625 }