src/afb-hook.c

   1 /*
   2  * Copyright (C) 2016, 2017 "IoT.bzh"
   3  * Author José Bollo <jose.bollo@iot.bzh>
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *   http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #define _GNU_SOURCE
  19
  20 #include <limits.h>
  21 #include <stdio.h>
  22 #include <stdarg.h>
  23 #include <string.h>
  24 #include <pthread.h>
  25 #include <unistd.h>
  26
  27 #include <json-c/json.h>
  28
  29 #include <afb/afb-req-itf.h>
  30 #include <afb/afb-event-itf.h>
  31
  32 #include "afb-context.h"
  33 #include "afb-hook.h"
  34 #include "afb-session.h"
  35 #include "afb-cred.h"
  36 #include "afb-xreq.h"
  37 #include "afb-ditf.h"
  38 #include "verbose.h"
  39
  40 /**
  41  * Definition of a hook for xreq
  42  */
  43 struct afb_hook_xreq {
  44         struct afb_hook_xreq *next; /**< next hook */
  45         unsigned refcount; /**< reference count */
  46         char *api; /**< api hooked or NULL for any */
  47         char *verb; /**< verb hooked or NULL for any */
  48         struct afb_session *session; /**< session hooked or NULL if any */
  49         unsigned flags; /**< hook flags */
  50         struct afb_hook_xreq_itf *itf; /**< interface of hook */
  51         void *closure; /**< closure for callbacks */
  52 };
  53
  54 /**
  55  * Definition of a hook for ditf
  56  */
  57 struct afb_hook_ditf {
  58         struct afb_hook_ditf *next; /**< next hook */
  59         unsigned refcount; /**< reference count */
  60         char *api; /**< api hooked or NULL for any */
  61         unsigned flags; /**< hook flags */
  62         struct afb_hook_ditf_itf *itf; /**< interface of hook */
  63         void *closure; /**< closure for callbacks */
  64 };
  65
  66 /* synchronisation across threads */
  67 static pthread_rwlock_t rwlock = PTHREAD_RWLOCK_INITIALIZER;
  68
  69 /* list of hooks for xreq */
  70 static struct afb_hook_xreq *list_of_xreq_hooks = NULL;
  71
  72 /* list of hooks for ditf */
  73 static struct afb_hook_ditf *list_of_ditf_hooks = NULL;
  74
  75 /******************************************************************************
  76  * section: default callbacks for tracing requests
  77  *****************************************************************************/
  78
  79 static void _hook_xreq_(const struct afb_xreq *xreq, const char *format, ...)
  80 {
  81         int len;
  82         char *buffer;
  83         va_list ap;
  84
  85         va_start(ap, format);
  86         len = vasprintf(&buffer, format, ap);
  87         va_end(ap);
  88
  89         if (len < 0)
  90                 NOTICE("hook xreq-%06d:%s/%s allocation error", xreq->hookindex, xreq->api, xreq->verb);
  91         else {
  92                 NOTICE("hook xreq-%06d:%s/%s %s", xreq->hookindex, xreq->api, xreq->verb, buffer);
  93                 free(buffer);
  94         }
  95 }
  96
  97 static void hook_xreq_begin_default_cb(void * closure, const struct afb_xreq *xreq)
  98 {
  99         if (!xreq->cred)
 100                 _hook_xreq_(xreq, "BEGIN");
 101         else
 102                 _hook_xreq_(xreq, "BEGIN uid=%d=%s gid=%d pid=%d label=%s id=%s",
 103                         (int)xreq->cred->uid,
 104                         xreq->cred->user,
 105                         (int)xreq->cred->gid,
 106                         (int)xreq->cred->pid,
 107                         xreq->cred->label?:"(null)",
 108                         xreq->cred->id?:"(null)"
 109                 );
 110 }
 111
 112 static void hook_xreq_end_default_cb(void * closure, const struct afb_xreq *xreq)
 113 {
 114         _hook_xreq_(xreq, "END");
 115 }
 116
 117 static void hook_xreq_json_default_cb(void * closure, const struct afb_xreq *xreq, struct json_object *obj)
 118 {
 119         _hook_xreq_(xreq, "json() -> %s", json_object_to_json_string(obj));
 120 }
 121
 122 static void hook_xreq_get_default_cb(void * closure, const struct afb_xreq *xreq, const char *name, struct afb_arg arg)
 123 {
 124         _hook_xreq_(xreq, "get(%s) -> { name: %s, value: %s, path: %s }", name, arg.name, arg.value, arg.path);
 125 }
 126
 127 static void hook_xreq_success_default_cb(void * closure, const struct afb_xreq *xreq, struct json_object *obj, const char *info)
 128 {
 129         _hook_xreq_(xreq, "success(%s, %s)", json_object_to_json_string(obj), info);
 130 }
 131
 132 static void hook_xreq_fail_default_cb(void * closure, const struct afb_xreq *xreq, const char *status, const char *info)
 133 {
 134         _hook_xreq_(xreq, "fail(%s, %s)", status, info);
 135 }
 136
 137 static void hook_xreq_context_get_default_cb(void * closure, const struct afb_xreq *xreq, void *value)
 138 {
 139         _hook_xreq_(xreq, "context_get() -> %p", value);
 140 }
 141
 142 static void hook_xreq_context_set_default_cb(void * closure, const struct afb_xreq *xreq, void *value, void (*free_value)(void*))
 143 {
 144         _hook_xreq_(xreq, "context_set(%p, %p)", value, free_value);
 145 }
 146
 147 static void hook_xreq_addref_default_cb(void * closure, const struct afb_xreq *xreq)
 148 {
 149         _hook_xreq_(xreq, "addref()");
 150 }
 151
 152 static void hook_xreq_unref_default_cb(void * closure, const struct afb_xreq *xreq)
 153 {
 154         _hook_xreq_(xreq, "unref()");
 155 }
 156
 157 static void hook_xreq_session_close_default_cb(void * closure, const struct afb_xreq *xreq)
 158 {
 159         _hook_xreq_(xreq, "session_close()");
 160 }
 161
 162 static void hook_xreq_session_set_LOA_default_cb(void * closure, const struct afb_xreq *xreq, unsigned level, int result)
 163 {
 164         _hook_xreq_(xreq, "session_set_LOA(%u) -> %d", level, result);
 165 }
 166
 167 static void hook_xreq_subscribe_default_cb(void * closure, const struct afb_xreq *xreq, struct afb_event event, int result)
 168 {
 169         _hook_xreq_(xreq, "subscribe(%s:%p) -> %d", afb_event_name(event), event.closure, result);
 170 }
 171
 172 static void hook_xreq_unsubscribe_default_cb(void * closure, const struct afb_xreq *xreq, struct afb_event event, int result)
 173 {
 174         _hook_xreq_(xreq, "unsubscribe(%s:%p) -> %d", afb_event_name(event), event.closure, result);
 175 }
 176
 177 static void hook_xreq_subcall_default_cb(void * closure, const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args)
 178 {
 179         _hook_xreq_(xreq, "subcall(%s/%s, %s) ...", api, verb, json_object_to_json_string(args));
 180 }
 181
 182 static void hook_xreq_subcall_result_default_cb(void * closure, const struct afb_xreq *xreq, int status, struct json_object *result)
 183 {
 184         _hook_xreq_(xreq, "    ...subcall... -> %d: %s", status, json_object_to_json_string(result));
 185 }
 186
 187 static void hook_xreq_subcallsync_default_cb(void * closure, const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args)
 188 {
 189         _hook_xreq_(xreq, "subcallsync(%s/%s, %s) ...", api, verb, json_object_to_json_string(args));
 190 }
 191
 192 static void hook_xreq_subcallsync_result_default_cb(void * closure, const struct afb_xreq *xreq, int status, struct json_object *result)
 193 {
 194         _hook_xreq_(xreq, "    ...subcallsync... -> %d: %s", status, json_object_to_json_string(result));
 195 }
 196
 197 static struct afb_hook_xreq_itf hook_xreq_default_itf = {
 198         .hook_xreq_begin = hook_xreq_begin_default_cb,
 199         .hook_xreq_end = hook_xreq_end_default_cb,
 200         .hook_xreq_json = hook_xreq_json_default_cb,
 201         .hook_xreq_get = hook_xreq_get_default_cb,
 202         .hook_xreq_success = hook_xreq_success_default_cb,
 203         .hook_xreq_fail = hook_xreq_fail_default_cb,
 204         .hook_xreq_context_get = hook_xreq_context_get_default_cb,
 205         .hook_xreq_context_set = hook_xreq_context_set_default_cb,
 206         .hook_xreq_addref = hook_xreq_addref_default_cb,
 207         .hook_xreq_unref = hook_xreq_unref_default_cb,
 208         .hook_xreq_session_close = hook_xreq_session_close_default_cb,
 209         .hook_xreq_session_set_LOA = hook_xreq_session_set_LOA_default_cb,
 210         .hook_xreq_subscribe = hook_xreq_subscribe_default_cb,
 211         .hook_xreq_unsubscribe = hook_xreq_unsubscribe_default_cb,
 212         .hook_xreq_subcall = hook_xreq_subcall_default_cb,
 213         .hook_xreq_subcall_result = hook_xreq_subcall_result_default_cb,
 214         .hook_xreq_subcallsync = hook_xreq_subcallsync_default_cb,
 215         .hook_xreq_subcallsync_result = hook_xreq_subcallsync_result_default_cb,
 216 };
 217
 218 /******************************************************************************
 219  * section: hooks for tracing requests
 220  *****************************************************************************/
 221
 222 #define _HOOK_XREQ_(what,...)   \
 223         struct afb_hook_xreq *hook; \
 224         pthread_rwlock_rdlock(&rwlock); \
 225         hook = list_of_xreq_hooks; \
 226         while (hook) { \
 227                 if (hook->itf->hook_xreq_##what \
 228                  && (hook->flags & afb_hook_flag_req_##what) != 0 \
 229                  && (!hook->session || hook->session == xreq->context.session) \
 230                  && (!hook->api || !strcasecmp(hook->api, xreq->api)) \
 231                  && (!hook->verb || !strcasecmp(hook->verb, xreq->verb))) { \
 232                         hook->itf->hook_xreq_##what(hook->closure, __VA_ARGS__); \
 233                 } \
 234                 hook = hook->next; \
 235         } \
 236         pthread_rwlock_unlock(&rwlock);
 237
 238
 239 void afb_hook_xreq_begin(const struct afb_xreq *xreq)
 240 {
 241         _HOOK_XREQ_(begin, xreq);
 242 }
 243
 244 void afb_hook_xreq_end(const struct afb_xreq *xreq)
 245 {
 246         _HOOK_XREQ_(end, xreq);
 247 }
 248
 249 struct json_object *afb_hook_xreq_json(const struct afb_xreq *xreq, struct json_object *obj)
 250 {
 251         _HOOK_XREQ_(json, xreq, obj);
 252         return obj;
 253 }
 254
 255 struct afb_arg afb_hook_xreq_get(const struct afb_xreq *xreq, const char *name, struct afb_arg arg)
 256 {
 257         _HOOK_XREQ_(get, xreq, name, arg);
 258         return arg;
 259 }
 260
 261 void afb_hook_xreq_success(const struct afb_xreq *xreq, struct json_object *obj, const char *info)
 262 {
 263         _HOOK_XREQ_(success, xreq, obj, info);
 264 }
 265
 266 void afb_hook_xreq_fail(const struct afb_xreq *xreq, const char *status, const char *info)
 267 {
 268         _HOOK_XREQ_(fail, xreq, status, info);
 269 }
 270
 271 void *afb_hook_xreq_context_get(const struct afb_xreq *xreq, void *value)
 272 {
 273         _HOOK_XREQ_(context_get, xreq, value);
 274         return value;
 275 }
 276
 277 void afb_hook_xreq_context_set(const struct afb_xreq *xreq, void *value, void (*free_value)(void*))
 278 {
 279         _HOOK_XREQ_(context_set, xreq, value, free_value);
 280 }
 281
 282 void afb_hook_xreq_addref(const struct afb_xreq *xreq)
 283 {
 284         _HOOK_XREQ_(addref, xreq);
 285 }
 286
 287 void afb_hook_xreq_unref(const struct afb_xreq *xreq)
 288 {
 289         _HOOK_XREQ_(unref, xreq);
 290 }
 291
 292 void afb_hook_xreq_session_close(const struct afb_xreq *xreq)
 293 {
 294         _HOOK_XREQ_(session_close, xreq);
 295 }
 296
 297 int afb_hook_xreq_session_set_LOA(const struct afb_xreq *xreq, unsigned level, int result)
 298 {
 299         _HOOK_XREQ_(session_set_LOA, xreq, level, result);
 300         return result;
 301 }
 302
 303 int afb_hook_xreq_subscribe(const struct afb_xreq *xreq, struct afb_event event, int result)
 304 {
 305         _HOOK_XREQ_(subscribe, xreq, event, result);
 306         return result;
 307 }
 308
 309 int afb_hook_xreq_unsubscribe(const struct afb_xreq *xreq, struct afb_event event, int result)
 310 {
 311         _HOOK_XREQ_(unsubscribe, xreq, event, result);
 312         return result;
 313 }
 314
 315 void afb_hook_xreq_subcall(const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args)
 316 {
 317         _HOOK_XREQ_(subcall, xreq, api, verb, args);
 318 }
 319
 320 void afb_hook_xreq_subcall_result(const struct afb_xreq *xreq, int status, struct json_object *result)
 321 {
 322         _HOOK_XREQ_(subcall_result, xreq, status, result);
 323 }
 324
 325 void afb_hook_xreq_subcallsync(const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args)
 326 {
 327         _HOOK_XREQ_(subcallsync, xreq, api, verb, args);
 328 }
 329
 330 int afb_hook_xreq_subcallsync_result(const struct afb_xreq *xreq, int status, struct json_object *result)
 331 {
 332         _HOOK_XREQ_(subcallsync_result, xreq, status, result);
 333         return status;
 334 }
 335
 336 /******************************************************************************
 337  * section:
 338  *****************************************************************************/
 339
 340 void afb_hook_init_xreq(struct afb_xreq *xreq)
 341 {
 342         static int reqindex;
 343
 344         int f, flags;
 345         int add;
 346         struct afb_hook_xreq *hook;
 347
 348         /* scan hook list to get the expected flags */
 349         flags = 0;
 350         pthread_rwlock_rdlock(&rwlock);
 351         hook = list_of_xreq_hooks;
 352         while (hook) {
 353                 f = hook->flags & afb_hook_flags_req_all;
 354                 add = f != 0
 355                    && (!hook->session || hook->session == xreq->context.session)
 356                    && (!hook->api || !strcasecmp(hook->api, xreq->api))
 357                    && (!hook->verb || !strcasecmp(hook->verb, xreq->verb));
 358                 if (add)
 359                         flags |= f;
 360                 hook = hook->next;
 361         }
 362         pthread_rwlock_unlock(&rwlock);
 363
 364         /* store the hooking data */
 365         xreq->hookflags = flags;
 366         if (flags) {
 367                 pthread_rwlock_wrlock(&rwlock);
 368                 if (++reqindex < 0)
 369                         reqindex = 1;
 370                 xreq->hookindex = reqindex;
 371                 pthread_rwlock_unlock(&rwlock);
 372         }
 373 }
 374
 375 struct afb_hook_xreq *afb_hook_create_xreq(const char *api, const char *verb, struct afb_session *session, int flags, struct afb_hook_xreq_itf *itf, void *closure)
 376 {
 377         struct afb_hook_xreq *hook;
 378
 379         /* alloc the result */
 380         hook = calloc(1, sizeof *hook);
 381         if (hook == NULL)
 382                 return NULL;
 383
 384         /* get a copy of the names */
 385         hook->api = api ? strdup(api) : NULL;
 386         hook->verb = verb ? strdup(verb) : NULL;
 387         if ((api && !hook->api) || (verb && !hook->verb)) {
 388                 free(hook->api);
 389                 free(hook->verb);
 390                 free(hook);
 391                 return NULL;
 392         }
 393
 394         /* initialise the rest */
 395         hook->session = session;
 396         if (session)
 397                 afb_session_addref(session);
 398         hook->refcount = 1;
 399         hook->flags = flags;
 400         hook->itf = itf ? itf : &hook_xreq_default_itf;
 401         hook->closure = closure;
 402
 403         /* record the hook */
 404         pthread_rwlock_wrlock(&rwlock);
 405         hook->next = list_of_xreq_hooks;
 406         list_of_xreq_hooks = hook;
 407         pthread_rwlock_unlock(&rwlock);
 408
 409         /* returns it */
 410         return hook;
 411 }
 412
 413 struct afb_hook_xreq *afb_hook_addref_xreq(struct afb_hook_xreq *hook)
 414 {
 415         pthread_rwlock_wrlock(&rwlock);
 416         hook->refcount++;
 417         pthread_rwlock_unlock(&rwlock);
 418         return hook;
 419 }
 420
 421 void afb_hook_unref_xreq(struct afb_hook_xreq *hook)
 422 {
 423         struct afb_hook_xreq **prv;
 424
 425         if (hook) {
 426                 pthread_rwlock_wrlock(&rwlock);
 427                 if (--hook->refcount)
 428                         hook = NULL;
 429                 else {
 430                         /* unlink */
 431                         prv = &list_of_xreq_hooks;
 432                         while (*prv && *prv != hook)
 433                                 prv = &(*prv)->next;
 434                         if(*prv)
 435                                 *prv = hook->next;
 436                 }
 437                 pthread_rwlock_unlock(&rwlock);
 438                 if (hook) {
 439                         /* free */
 440                         free(hook->api);
 441                         free(hook->verb);
 442                         if (hook->session)
 443                                 afb_session_unref(hook->session);
 444                         free(hook);
 445                 }
 446         }
 447 }
 448
 449 /******************************************************************************
 450  * section: default callbacks for tracing daemon interface
 451  *****************************************************************************/
 452
 453 static void _hook_ditf_(const struct afb_ditf *ditf, const char *format, ...)
 454 {
 455         int len;
 456         char *buffer;
 457         va_list ap;
 458
 459         va_start(ap, format);
 460         len = vasprintf(&buffer, format, ap);
 461         va_end(ap);
 462
 463         if (len < 0)
 464                 NOTICE("hook ditf-%s allocation error for %s", ditf->prefix, format);
 465         else {
 466                 NOTICE("hook ditf-%s %s", ditf->prefix, buffer);
 467                 free(buffer);
 468         }
 469 }
 470
 471 static void hook_ditf_event_broadcast_before_cb(void *closure, const struct afb_ditf *ditf, const char *name, struct json_object *object)
 472 {
 473         _hook_ditf_(ditf, "event_broadcast.before(%s, %s)....", name, json_object_to_json_string(object));
 474 }
 475
 476 static void hook_ditf_event_broadcast_after_cb(void *closure, const struct afb_ditf *ditf, const char *name, struct json_object *object, int result)
 477 {
 478         _hook_ditf_(ditf, "event_broadcast.after(%s, %s) -> %d", name, json_object_to_json_string(object), result);
 479 }
 480
 481 static void hook_ditf_get_event_loop_cb(void *closure, const struct afb_ditf *ditf, struct sd_event *result)
 482 {
 483         _hook_ditf_(ditf, "get_event_loop() -> %p", result);
 484 }
 485
 486 static void hook_ditf_get_user_bus_cb(void *closure, const struct afb_ditf *ditf, struct sd_bus *result)
 487 {
 488         _hook_ditf_(ditf, "get_user_bus() -> %p", result);
 489 }
 490
 491 static void hook_ditf_get_system_bus_cb(void *closure, const struct afb_ditf *ditf, struct sd_bus *result)
 492 {
 493         _hook_ditf_(ditf, "get_system_bus() -> %p", result);
 494 }
 495
 496 static void hook_ditf_vverbose_cb(void*closure, const struct afb_ditf *ditf, int level, const char *file, int line, const char *function, const char *fmt, va_list args)
 497 {
 498         int len;
 499         char *msg;
 500         va_list ap;
 501
 502         va_copy(ap, args);
 503         len = vasprintf(&msg, fmt, ap);
 504         va_end(ap);
 505
 506         if (len < 0)
 507                 _hook_ditf_(ditf, "vverbose(%d, %s, %d, %s) -> %s ? ? ?", level, file, line, function, fmt);
 508         else {
 509                 _hook_ditf_(ditf, "vverbose(%d, %s, %d, %s) -> %s", level, file, line, function, msg);
 510                 free(msg);
 511         }
 512 }
 513
 514 static void hook_ditf_event_make_cb(void *closure, const struct afb_ditf *ditf, const char *name, struct afb_event result)
 515 {
 516         _hook_ditf_(ditf, "event_make(%s) -> %s:%p", name, afb_event_name(result), result.closure);
 517 }
 518
 519 static void hook_ditf_rootdir_get_fd_cb(void *closure, const struct afb_ditf *ditf, int result)
 520 {
 521         char path[PATH_MAX];
 522         if (result < 0)
 523                 _hook_ditf_(ditf, "rootdir_get_fd() -> %d, %m", result);
 524         else {
 525                 sprintf(path, "/proc/self/fd/%d", result);
 526                 readlink(path, path, sizeof path);
 527                 _hook_ditf_(ditf, "rootdir_get_fd() -> %d = %s", result, path);
 528         }
 529 }
 530
 531 static void hook_ditf_rootdir_open_locale_cb(void *closure, const struct afb_ditf *ditf, const char *filename, int flags, const char *locale, int result)
 532 {
 533         char path[PATH_MAX];
 534         if (!locale)
 535                 locale = "(null)";
 536         if (result < 0)
 537                 _hook_ditf_(ditf, "rootdir_open_locale(%s, %d, %s) -> %d, %m", filename, flags, locale, result);
 538         else {
 539                 sprintf(path, "/proc/self/fd/%d", result);
 540                 readlink(path, path, sizeof path);
 541                 _hook_ditf_(ditf, "rootdir_open_locale(%s, %d, %s) -> %d = %s", filename, flags, locale, result, path);
 542         }
 543 }
 544
 545 static void hook_ditf_queue_job(void *closure, const struct afb_ditf *ditf, void (*callback)(int signum, void *arg), void *argument, void *group, int timeout, int result)
 546 {
 547         _hook_ditf_(ditf, "queue_job(%p, %p, %p, %d) -> %d", callback, argument, group, timeout, result);
 548 }
 549
 550 static struct afb_hook_ditf_itf hook_ditf_default_itf = {
 551         .hook_ditf_event_broadcast_before = hook_ditf_event_broadcast_before_cb,
 552         .hook_ditf_event_broadcast_after = hook_ditf_event_broadcast_after_cb,
 553         .hook_ditf_get_event_loop = hook_ditf_get_event_loop_cb,
 554         .hook_ditf_get_user_bus = hook_ditf_get_user_bus_cb,
 555         .hook_ditf_get_system_bus = hook_ditf_get_system_bus_cb,
 556         .hook_ditf_vverbose = hook_ditf_vverbose_cb,
 557         .hook_ditf_event_make = hook_ditf_event_make_cb,
 558         .hook_ditf_rootdir_get_fd = hook_ditf_rootdir_get_fd_cb,
 559         .hook_ditf_rootdir_open_locale = hook_ditf_rootdir_open_locale_cb,
 560         .hook_ditf_queue_job = hook_ditf_queue_job
 561 };
 562
 563 /******************************************************************************
 564  * section: hooks for tracing requests
 565  *****************************************************************************/
 566
 567 #define _HOOK_DITF_(what,...)   \
 568         struct afb_hook_ditf *hook; \
 569         pthread_rwlock_rdlock(&rwlock); \
 570         hook = list_of_ditf_hooks; \
 571         while (hook) { \
 572                 if (hook->itf->hook_ditf_##what \
 573                  && (hook->flags & afb_hook_flag_ditf_##what) != 0 \
 574                  && (!hook->api || !strcasecmp(hook->api, ditf->prefix))) { \
 575                         hook->itf->hook_ditf_##what(hook->closure, __VA_ARGS__); \
 576                 } \
 577                 hook = hook->next; \
 578         } \
 579         pthread_rwlock_unlock(&rwlock);
 580
 581 void afb_hook_ditf_event_broadcast_before(const struct afb_ditf *ditf, const char *name, struct json_object *object)
 582 {
 583         _HOOK_DITF_(event_broadcast_before, ditf, name, object);
 584 }
 585
 586 int afb_hook_ditf_event_broadcast_after(const struct afb_ditf *ditf, const char *name, struct json_object *object, int result)
 587 {
 588         _HOOK_DITF_(event_broadcast_after, ditf, name, object, result);
 589         return result;
 590 }
 591
 592 struct sd_event *afb_hook_ditf_get_event_loop(const struct afb_ditf *ditf, struct sd_event *result)
 593 {
 594         _HOOK_DITF_(get_event_loop, ditf, result);
 595         return result;
 596 }
 597
 598 struct sd_bus *afb_hook_ditf_get_user_bus(const struct afb_ditf *ditf, struct sd_bus *result)
 599 {
 600         _HOOK_DITF_(get_user_bus, ditf, result);
 601         return result;
 602 }
 603
 604 struct sd_bus *afb_hook_ditf_get_system_bus(const struct afb_ditf *ditf, struct sd_bus *result)
 605 {
 606         _HOOK_DITF_(get_system_bus, ditf, result);
 607         return result;
 608 }
 609
 610 void afb_hook_ditf_vverbose(const struct afb_ditf *ditf, int level, const char *file, int line, const char *function, const char *fmt, va_list args)
 611 {
 612         _HOOK_DITF_(vverbose, ditf, level, file, line, function, fmt, args);
 613 }
 614
 615 struct afb_event afb_hook_ditf_event_make(const struct afb_ditf *ditf, const char *name, struct afb_event result)
 616 {
 617         _HOOK_DITF_(event_make, ditf, name, result);
 618         return result;
 619 }
 620
 621 int afb_hook_ditf_rootdir_get_fd(const struct afb_ditf *ditf, int result)
 622 {
 623         _HOOK_DITF_(rootdir_get_fd, ditf, result);
 624         return result;
 625 }
 626
 627 int afb_hook_ditf_rootdir_open_locale(const struct afb_ditf *ditf, const char *filename, int flags, const char *locale, int result)
 628 {
 629         _HOOK_DITF_(rootdir_open_locale, ditf, filename, flags, locale, result);
 630         return result;
 631 }
 632
 633 int afb_hook_ditf_queue_job(const struct afb_ditf *ditf, void (*callback)(int signum, void *arg), void *argument, void *group, int timeout, int result)
 634 {
 635         _HOOK_DITF_(queue_job, ditf, callback, argument, group, timeout, result);
 636         return result;
 637 }
 638
 639 /******************************************************************************
 640  * section:
 641  *****************************************************************************/
 642
 643 int afb_hook_flags_ditf(const char *api)
 644 {
 645         int flags;
 646         struct afb_hook_ditf *hook;
 647
 648         pthread_rwlock_rdlock(&rwlock);
 649         flags = 0;
 650         hook = list_of_ditf_hooks;
 651         while (hook) {
 652                 if (!api || !hook->api || !strcasecmp(hook->api, api))
 653                         flags |= hook->flags;
 654                 hook = hook->next;
 655         }
 656         pthread_rwlock_unlock(&rwlock);
 657         return flags;
 658 }
 659
 660 struct afb_hook_ditf *afb_hook_create_ditf(const char *api, int flags, struct afb_hook_ditf_itf *itf, void *closure)
 661 {
 662         struct afb_hook_ditf *hook;
 663
 664         /* alloc the result */
 665         hook = calloc(1, sizeof *hook);
 666         if (hook == NULL)
 667                 return NULL;
 668
 669         /* get a copy of the names */
 670         hook->api = api ? strdup(api) : NULL;
 671         if (api && !hook->api) {
 672                 free(hook);
 673                 return NULL;
 674         }
 675
 676         /* initialise the rest */
 677         hook->refcount = 1;
 678         hook->flags = flags;
 679         hook->itf = itf ? itf : &hook_ditf_default_itf;
 680         hook->closure = closure;
 681
 682         /* record the hook */
 683         pthread_rwlock_wrlock(&rwlock);
 684         hook->next = list_of_ditf_hooks;
 685         list_of_ditf_hooks = hook;
 686         pthread_rwlock_unlock(&rwlock);
 687
 688         /* returns it */
 689         return hook;
 690 }
 691
 692 struct afb_hook_ditf *afb_hook_addref_ditf(struct afb_hook_ditf *hook)
 693 {
 694         pthread_rwlock_wrlock(&rwlock);
 695         hook->refcount++;
 696         pthread_rwlock_unlock(&rwlock);
 697         return hook;
 698 }
 699
 700 void afb_hook_unref_ditf(struct afb_hook_ditf *hook)
 701 {
 702         struct afb_hook_ditf **prv;
 703
 704         if (hook) {
 705                 pthread_rwlock_wrlock(&rwlock);
 706                 if (--hook->refcount)
 707                         hook = NULL;
 708                 else {
 709                         /* unlink */
 710                         prv = &list_of_ditf_hooks;
 711                         while (*prv && *prv != hook)
 712                                 prv = &(*prv)->next;
 713                         if(*prv)
 714                                 *prv = hook->next;
 715                 }
 716                 pthread_rwlock_unlock(&rwlock);
 717                 if (hook) {
 718                         /* free */
 719                         free(hook->api);
 720                         free(hook);
 721                 }
 722         }
 723 }
 724