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 #include <fnmatch.h>
  27 #include <sys/uio.h>
  28
  29 #include <json-c/json.h>
  30
  31 #include <afb/afb-req-common.h>
  32 #include <afb/afb-event-itf.h>
  33
  34 #include "afb-context.h"
  35 #include "afb-hook.h"
  36 #include "afb-session.h"
  37 #include "afb-cred.h"
  38 #include "afb-xreq.h"
  39 #include "afb-export.h"
  40 #include "afb-evt.h"
  41 #include "verbose.h"
  42
  43 /**
  44  * Definition of a hook for xreq
  45  */
  46 struct afb_hook_xreq {
  47         struct afb_hook_xreq *next; /**< next hook */
  48         unsigned refcount; /**< reference count */
  49         char *api; /**< api hooked or NULL for any */
  50         char *verb; /**< verb hooked or NULL for any */
  51         struct afb_session *session; /**< session hooked or NULL if any */
  52         unsigned flags; /**< hook flags */
  53         struct afb_hook_xreq_itf *itf; /**< interface of hook */
  54         void *closure; /**< closure for callbacks */
  55 };
  56
  57 /**
  58  * Definition of a hook for export
  59  */
  60 struct afb_hook_ditf {
  61         struct afb_hook_ditf *next; /**< next hook */
  62         unsigned refcount; /**< reference count */
  63         char *api; /**< api hooked or NULL for any */
  64         unsigned flags; /**< hook flags */
  65         struct afb_hook_ditf_itf *itf; /**< interface of hook */
  66         void *closure; /**< closure for callbacks */
  67 };
  68
  69 /**
  70  * Definition of a hook for export
  71  */
  72 struct afb_hook_svc {
  73         struct afb_hook_svc *next; /**< next hook */
  74         unsigned refcount; /**< reference count */
  75         char *api; /**< api hooked or NULL for any */
  76         unsigned flags; /**< hook flags */
  77         struct afb_hook_svc_itf *itf; /**< interface of hook */
  78         void *closure; /**< closure for callbacks */
  79 };
  80
  81 /**
  82  * Definition of a hook for evt
  83  */
  84 struct afb_hook_evt {
  85         struct afb_hook_evt *next; /**< next hook */
  86         unsigned refcount; /**< reference count */
  87         char *pattern; /**< event pattern name hooked or NULL for any */
  88         unsigned flags; /**< hook flags */
  89         struct afb_hook_evt_itf *itf; /**< interface of hook */
  90         void *closure; /**< closure for callbacks */
  91 };
  92
  93 /**
  94  * Definition of a hook for global
  95  */
  96 struct afb_hook_global {
  97         struct afb_hook_global *next; /**< next hook */
  98         unsigned refcount; /**< reference count */
  99         unsigned flags; /**< hook flags */
 100         struct afb_hook_global_itf *itf; /**< interface of hook */
 101         void *closure; /**< closure for callbacks */
 102 };
 103
 104 /* synchronisation across threads */
 105 static pthread_rwlock_t rwlock = PTHREAD_RWLOCK_INITIALIZER;
 106
 107 /* list of hooks for xreq */
 108 static struct afb_hook_xreq *list_of_xreq_hooks = NULL;
 109
 110 /* list of hooks for export */
 111 static struct afb_hook_ditf *list_of_ditf_hooks = NULL;
 112
 113 /* list of hooks for export */
 114 static struct afb_hook_svc *list_of_svc_hooks = NULL;
 115
 116 /* list of hooks for evt */
 117 static struct afb_hook_evt *list_of_evt_hooks = NULL;
 118
 119 /* list of hooks for global */
 120 static struct afb_hook_global *list_of_global_hooks = NULL;
 121
 122 /* hook id */
 123 static unsigned next_hookid = 0;
 124
 125 /******************************************************************************
 126  * section: hook id
 127  *****************************************************************************/
 128 static void init_hookid(struct afb_hookid *hookid)
 129 {
 130         hookid->id = __atomic_add_fetch(&next_hookid, 1, __ATOMIC_RELAXED);
 131         clock_gettime(CLOCK_MONOTONIC, &hookid->time);
 132 }
 133
 134 /******************************************************************************
 135  * section: default callbacks for tracing requests
 136  *****************************************************************************/
 137
 138 static char *_pbuf_(const char *fmt, va_list args, char **palloc, char *sbuf, size_t szsbuf, size_t *outlen)
 139 {
 140         int rc;
 141         va_list cp;
 142
 143         *palloc = NULL;
 144         va_copy(cp, args);
 145         rc = vsnprintf(sbuf, szsbuf, fmt, args);
 146         if ((size_t)rc >= szsbuf) {
 147                 sbuf[szsbuf-1] = 0;
 148                 sbuf[szsbuf-2] = sbuf[szsbuf-3] = sbuf[szsbuf-4] = '.';
 149                 rc = vasprintf(palloc, fmt, cp);
 150                 if (rc >= 0)
 151                         sbuf = *palloc;
 152         }
 153         va_end(cp);
 154         if (rc >= 0 && outlen)
 155                 *outlen = (size_t)rc;
 156         return sbuf;
 157 }
 158
 159 #if 0 /* old behaviour: use NOTICE */
 160 static void _hook_(const char *fmt1, const char *fmt2, va_list arg2, ...)
 161 {
 162         char *tag, *data, *mem1, *mem2, buf1[256], buf2[2000];
 163         va_list arg1;
 164
 165         data = _pbuf_(fmt2, arg2, &mem2, buf2, sizeof buf2, NULL);
 166
 167         va_start(arg1, arg2);
 168         tag = _pbuf_(fmt1, arg1, &mem1, buf1, sizeof buf1, NULL);
 169         va_end(arg1);
 170
 171         NOTICE("[HOOK %s] %s", tag, data);
 172
 173         free(mem1);
 174         free(mem2);
 175 }
 176 #else /* new behaviour: emits directly to stderr */
 177 static void _hook_(const char *fmt1, const char *fmt2, va_list arg2, ...)
 178 {
 179         static const char chars[] = "HOOK: [] \n";
 180         char *mem1, *mem2, buf1[256], buf2[2000];
 181         struct iovec iov[5];
 182         va_list arg1;
 183
 184         iov[0].iov_base = (void*)&chars[0];
 185         iov[0].iov_len = 7;
 186
 187         va_start(arg1, arg2);
 188         iov[1].iov_base = _pbuf_(fmt1, arg1, &mem1, buf1, sizeof buf1, &iov[1].iov_len);
 189         va_end(arg1);
 190
 191         iov[2].iov_base = (void*)&chars[7];
 192         iov[2].iov_len = 2;
 193
 194         iov[3].iov_base = _pbuf_(fmt2, arg2, &mem2, buf2, sizeof buf2, &iov[3].iov_len);
 195
 196         iov[4].iov_base = (void*)&chars[9];
 197         iov[4].iov_len = 1;
 198
 199         writev(2, iov, 5);
 200
 201         free(mem1);
 202         free(mem2);
 203 }
 204 #endif
 205
 206 static void _hook_xreq_(const struct afb_xreq *xreq, const char *format, ...)
 207 {
 208         va_list ap;
 209         va_start(ap, format);
 210         _hook_("xreq-%06d:%s/%s", format, ap, xreq->hookindex, xreq->api, xreq->verb);
 211         va_end(ap);
 212 }
 213
 214 static void hook_xreq_begin_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq)
 215 {
 216         if (!xreq->cred)
 217                 _hook_xreq_(xreq, "BEGIN");
 218         else
 219                 _hook_xreq_(xreq, "BEGIN uid=%d=%s gid=%d pid=%d label=%s id=%s",
 220                         (int)xreq->cred->uid,
 221                         xreq->cred->user,
 222                         (int)xreq->cred->gid,
 223                         (int)xreq->cred->pid,
 224                         xreq->cred->label?:"(null)",
 225                         xreq->cred->id?:"(null)"
 226                 );
 227 }
 228
 229 static void hook_xreq_end_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq)
 230 {
 231         _hook_xreq_(xreq, "END");
 232 }
 233
 234 static void hook_xreq_json_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct json_object *obj)
 235 {
 236         _hook_xreq_(xreq, "json() -> %s", json_object_to_json_string(obj));
 237 }
 238
 239 static void hook_xreq_get_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *name, struct afb_arg arg)
 240 {
 241         _hook_xreq_(xreq, "get(%s) -> { name: %s, value: %s, path: %s }", name, arg.name, arg.value, arg.path);
 242 }
 243
 244 static void hook_xreq_success_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct json_object *obj, const char *info)
 245 {
 246         _hook_xreq_(xreq, "success(%s, %s)", json_object_to_json_string(obj), info);
 247 }
 248
 249 static void hook_xreq_fail_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *status, const char *info)
 250 {
 251         _hook_xreq_(xreq, "fail(%s, %s)", status, info);
 252 }
 253
 254 static void hook_xreq_context_get_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, void *value)
 255 {
 256         _hook_xreq_(xreq, "context_get() -> %p", value);
 257 }
 258
 259 static void hook_xreq_context_set_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, void *value, void (*free_value)(void*))
 260 {
 261         _hook_xreq_(xreq, "context_set(%p, %p)", value, free_value);
 262 }
 263
 264 static void hook_xreq_addref_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq)
 265 {
 266         _hook_xreq_(xreq, "addref()");
 267 }
 268
 269 static void hook_xreq_unref_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq)
 270 {
 271         _hook_xreq_(xreq, "unref()");
 272 }
 273
 274 static void hook_xreq_session_close_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq)
 275 {
 276         _hook_xreq_(xreq, "session_close()");
 277 }
 278
 279 static void hook_xreq_session_set_LOA_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, unsigned level, int result)
 280 {
 281         _hook_xreq_(xreq, "session_set_LOA(%u) -> %d", level, result);
 282 }
 283
 284 static void hook_xreq_subscribe_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct afb_event event, int result)
 285 {
 286         _hook_xreq_(xreq, "subscribe(%s:%d) -> %d", afb_evt_event_name(event), afb_evt_event_id(event), result);
 287 }
 288
 289 static void hook_xreq_unsubscribe_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct afb_event event, int result)
 290 {
 291         _hook_xreq_(xreq, "unsubscribe(%s:%d) -> %d", afb_evt_event_name(event), afb_evt_event_id(event), result);
 292 }
 293
 294 static void hook_xreq_subcall_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args)
 295 {
 296         _hook_xreq_(xreq, "subcall(%s/%s, %s) ...", api, verb, json_object_to_json_string(args));
 297 }
 298
 299 static void hook_xreq_subcall_result_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, int status, struct json_object *result)
 300 {
 301         _hook_xreq_(xreq, "    ...subcall... -> %d: %s", status, json_object_to_json_string(result));
 302 }
 303
 304 static void hook_xreq_subcallsync_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args)
 305 {
 306         _hook_xreq_(xreq, "subcallsync(%s/%s, %s) ...", api, verb, json_object_to_json_string(args));
 307 }
 308
 309 static void hook_xreq_subcallsync_result_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, int status, struct json_object *result)
 310 {
 311         _hook_xreq_(xreq, "    ...subcallsync... -> %d: %s", status, json_object_to_json_string(result));
 312 }
 313
 314 static void hook_xreq_vverbose_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, int level, const char *file, int line, const char *func, const char *fmt, va_list args)
 315 {
 316         int len;
 317         char *msg;
 318         va_list ap;
 319
 320         va_copy(ap, args);
 321         len = vasprintf(&msg, fmt, ap);
 322         va_end(ap);
 323
 324         if (len < 0)
 325                 _hook_xreq_(xreq, "vverbose(%d, %s, %d, %s) -> %s ? ? ?", level, file, line, func, fmt);
 326         else {
 327                 _hook_xreq_(xreq, "vverbose(%d, %s, %d, %s) -> %s", level, file, line, func, msg);
 328                 free(msg);
 329         }
 330 }
 331
 332 static void hook_xreq_store_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct afb_stored_req *sreq)
 333 {
 334         _hook_xreq_(xreq, "store() -> %p", sreq);
 335 }
 336
 337 static void hook_xreq_unstore_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq)
 338 {
 339         _hook_xreq_(xreq, "unstore()");
 340 }
 341
 342 static void hook_xreq_subcall_req_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args)
 343 {
 344         _hook_xreq_(xreq, "subcall_req(%s/%s, %s) ...", api, verb, json_object_to_json_string(args));
 345 }
 346
 347 static void hook_xreq_subcall_req_result_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, int status, struct json_object *result)
 348 {
 349         _hook_xreq_(xreq, "    ...subcall_req... -> %d: %s", status, json_object_to_json_string(result));
 350 }
 351
 352 static void hook_xreq_has_permission_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *permission, int result)
 353 {
 354         _hook_xreq_(xreq, "has_permission(%s) -> %d", permission, result);
 355 }
 356
 357 static struct afb_hook_xreq_itf hook_xreq_default_itf = {
 358         .hook_xreq_begin = hook_xreq_begin_default_cb,
 359         .hook_xreq_end = hook_xreq_end_default_cb,
 360         .hook_xreq_json = hook_xreq_json_default_cb,
 361         .hook_xreq_get = hook_xreq_get_default_cb,
 362         .hook_xreq_success = hook_xreq_success_default_cb,
 363         .hook_xreq_fail = hook_xreq_fail_default_cb,
 364         .hook_xreq_context_get = hook_xreq_context_get_default_cb,
 365         .hook_xreq_context_set = hook_xreq_context_set_default_cb,
 366         .hook_xreq_addref = hook_xreq_addref_default_cb,
 367         .hook_xreq_unref = hook_xreq_unref_default_cb,
 368         .hook_xreq_session_close = hook_xreq_session_close_default_cb,
 369         .hook_xreq_session_set_LOA = hook_xreq_session_set_LOA_default_cb,
 370         .hook_xreq_subscribe = hook_xreq_subscribe_default_cb,
 371         .hook_xreq_unsubscribe = hook_xreq_unsubscribe_default_cb,
 372         .hook_xreq_subcall = hook_xreq_subcall_default_cb,
 373         .hook_xreq_subcall_result = hook_xreq_subcall_result_default_cb,
 374         .hook_xreq_subcallsync = hook_xreq_subcallsync_default_cb,
 375         .hook_xreq_subcallsync_result = hook_xreq_subcallsync_result_default_cb,
 376         .hook_xreq_vverbose = hook_xreq_vverbose_default_cb,
 377         .hook_xreq_store = hook_xreq_store_default_cb,
 378         .hook_xreq_unstore = hook_xreq_unstore_default_cb,
 379         .hook_xreq_subcall_req = hook_xreq_subcall_req_default_cb,
 380         .hook_xreq_subcall_req_result = hook_xreq_subcall_req_result_default_cb,
 381         .hook_xreq_has_permission = hook_xreq_has_permission_default_cb
 382 };
 383
 384 /******************************************************************************
 385  * section: hooks for tracing requests
 386  *****************************************************************************/
 387
 388 #define _HOOK_XREQ_(what,...)   \
 389         struct afb_hook_xreq *hook; \
 390         struct afb_hookid hookid; \
 391         pthread_rwlock_rdlock(&rwlock); \
 392         init_hookid(&hookid); \
 393         hook = list_of_xreq_hooks; \
 394         while (hook) { \
 395                 if (hook->itf->hook_xreq_##what \
 396                  && (hook->flags & afb_hook_flag_req_##what) != 0 \
 397                  && (!hook->session || hook->session == xreq->context.session) \
 398                  && (!hook->api || !strcasecmp(hook->api, xreq->api)) \
 399                  && (!hook->verb || !strcasecmp(hook->verb, xreq->verb))) { \
 400                         hook->itf->hook_xreq_##what(hook->closure, &hookid, __VA_ARGS__); \
 401                 } \
 402                 hook = hook->next; \
 403         } \
 404         pthread_rwlock_unlock(&rwlock);
 405
 406
 407 void afb_hook_xreq_begin(const struct afb_xreq *xreq)
 408 {
 409         _HOOK_XREQ_(begin, xreq);
 410 }
 411
 412 void afb_hook_xreq_end(const struct afb_xreq *xreq)
 413 {
 414         _HOOK_XREQ_(end, xreq);
 415 }
 416
 417 struct json_object *afb_hook_xreq_json(const struct afb_xreq *xreq, struct json_object *obj)
 418 {
 419         _HOOK_XREQ_(json, xreq, obj);
 420         return obj;
 421 }
 422
 423 struct afb_arg afb_hook_xreq_get(const struct afb_xreq *xreq, const char *name, struct afb_arg arg)
 424 {
 425         _HOOK_XREQ_(get, xreq, name, arg);
 426         return arg;
 427 }
 428
 429 void afb_hook_xreq_success(const struct afb_xreq *xreq, struct json_object *obj, const char *info)
 430 {
 431         _HOOK_XREQ_(success, xreq, obj, info);
 432 }
 433
 434 void afb_hook_xreq_fail(const struct afb_xreq *xreq, const char *status, const char *info)
 435 {
 436         _HOOK_XREQ_(fail, xreq, status, info);
 437 }
 438
 439 void *afb_hook_xreq_context_get(const struct afb_xreq *xreq, void *value)
 440 {
 441         _HOOK_XREQ_(context_get, xreq, value);
 442         return value;
 443 }
 444
 445 void afb_hook_xreq_context_set(const struct afb_xreq *xreq, void *value, void (*free_value)(void*))
 446 {
 447         _HOOK_XREQ_(context_set, xreq, value, free_value);
 448 }
 449
 450 void afb_hook_xreq_addref(const struct afb_xreq *xreq)
 451 {
 452         _HOOK_XREQ_(addref, xreq);
 453 }
 454
 455 void afb_hook_xreq_unref(const struct afb_xreq *xreq)
 456 {
 457         _HOOK_XREQ_(unref, xreq);
 458 }
 459
 460 void afb_hook_xreq_session_close(const struct afb_xreq *xreq)
 461 {
 462         _HOOK_XREQ_(session_close, xreq);
 463 }
 464
 465 int afb_hook_xreq_session_set_LOA(const struct afb_xreq *xreq, unsigned level, int result)
 466 {
 467         _HOOK_XREQ_(session_set_LOA, xreq, level, result);
 468         return result;
 469 }
 470
 471 int afb_hook_xreq_subscribe(const struct afb_xreq *xreq, struct afb_event event, int result)
 472 {
 473         _HOOK_XREQ_(subscribe, xreq, event, result);
 474         return result;
 475 }
 476
 477 int afb_hook_xreq_unsubscribe(const struct afb_xreq *xreq, struct afb_event event, int result)
 478 {
 479         _HOOK_XREQ_(unsubscribe, xreq, event, result);
 480         return result;
 481 }
 482
 483 void afb_hook_xreq_subcall(const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args)
 484 {
 485         _HOOK_XREQ_(subcall, xreq, api, verb, args);
 486 }
 487
 488 void afb_hook_xreq_subcall_result(const struct afb_xreq *xreq, int status, struct json_object *result)
 489 {
 490         _HOOK_XREQ_(subcall_result, xreq, status, result);
 491 }
 492
 493 void afb_hook_xreq_subcallsync(const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args)
 494 {
 495         _HOOK_XREQ_(subcallsync, xreq, api, verb, args);
 496 }
 497
 498 int afb_hook_xreq_subcallsync_result(const struct afb_xreq *xreq, int status, struct json_object *result)
 499 {
 500         _HOOK_XREQ_(subcallsync_result, xreq, status, result);
 501         return status;
 502 }
 503
 504 void afb_hook_xreq_vverbose(const struct afb_xreq *xreq, int level, const char *file, int line, const char *func, const char *fmt, va_list args)
 505 {
 506         _HOOK_XREQ_(vverbose, xreq, level, file ?: "?", line, func ?: "?", fmt, args);
 507 }
 508
 509 void afb_hook_xreq_store(const struct afb_xreq *xreq, struct afb_stored_req *sreq)
 510 {
 511         _HOOK_XREQ_(store, xreq, sreq);
 512 }
 513
 514 void afb_hook_xreq_unstore(const struct afb_xreq *xreq)
 515 {
 516         _HOOK_XREQ_(unstore, xreq);
 517 }
 518
 519 void afb_hook_xreq_subcall_req(const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args)
 520 {
 521         _HOOK_XREQ_(subcall_req, xreq, api, verb, args);
 522 }
 523
 524 void afb_hook_xreq_subcall_req_result(const struct afb_xreq *xreq, int status, struct json_object *result)
 525 {
 526         _HOOK_XREQ_(subcall_req_result, xreq, status, result);
 527 }
 528
 529 int afb_hook_xreq_has_permission(const struct afb_xreq *xreq, const char *permission, int result)
 530 {
 531         _HOOK_XREQ_(has_permission, xreq, permission, result);
 532         return result;
 533 }
 534
 535 /******************************************************************************
 536  * section: hooking xreqs
 537  *****************************************************************************/
 538
 539 void afb_hook_init_xreq(struct afb_xreq *xreq)
 540 {
 541         static int reqindex;
 542
 543         int f, flags;
 544         int add;
 545         struct afb_hook_xreq *hook;
 546
 547         /* scan hook list to get the expected flags */
 548         flags = 0;
 549         pthread_rwlock_rdlock(&rwlock);
 550         hook = list_of_xreq_hooks;
 551         while (hook) {
 552                 f = hook->flags & afb_hook_flags_req_all;
 553                 add = f != 0
 554                    && (!hook->session || hook->session == xreq->context.session)
 555                    && (!hook->api || !strcasecmp(hook->api, xreq->api))
 556                    && (!hook->verb || !strcasecmp(hook->verb, xreq->verb));
 557                 if (add)
 558                         flags |= f;
 559                 hook = hook->next;
 560         }
 561         pthread_rwlock_unlock(&rwlock);
 562
 563         /* store the hooking data */
 564         xreq->hookflags = flags;
 565         if (flags) {
 566                 pthread_rwlock_wrlock(&rwlock);
 567                 if (++reqindex < 0)
 568                         reqindex = 1;
 569                 xreq->hookindex = reqindex;
 570                 pthread_rwlock_unlock(&rwlock);
 571         }
 572 }
 573
 574 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)
 575 {
 576         struct afb_hook_xreq *hook;
 577
 578         /* alloc the result */
 579         hook = calloc(1, sizeof *hook);
 580         if (hook == NULL)
 581                 return NULL;
 582
 583         /* get a copy of the names */
 584         hook->api = api ? strdup(api) : NULL;
 585         hook->verb = verb ? strdup(verb) : NULL;
 586         if ((api && !hook->api) || (verb && !hook->verb)) {
 587                 free(hook->api);
 588                 free(hook->verb);
 589                 free(hook);
 590                 return NULL;
 591         }
 592
 593         /* initialise the rest */
 594         hook->session = session;
 595         if (session)
 596                 afb_session_addref(session);
 597         hook->refcount = 1;
 598         hook->flags = flags;
 599         hook->itf = itf ? itf : &hook_xreq_default_itf;
 600         hook->closure = closure;
 601
 602         /* record the hook */
 603         pthread_rwlock_wrlock(&rwlock);
 604         hook->next = list_of_xreq_hooks;
 605         list_of_xreq_hooks = hook;
 606         pthread_rwlock_unlock(&rwlock);
 607
 608         /* returns it */
 609         return hook;
 610 }
 611
 612 struct afb_hook_xreq *afb_hook_addref_xreq(struct afb_hook_xreq *hook)
 613 {
 614         pthread_rwlock_wrlock(&rwlock);
 615         hook->refcount++;
 616         pthread_rwlock_unlock(&rwlock);
 617         return hook;
 618 }
 619
 620 void afb_hook_unref_xreq(struct afb_hook_xreq *hook)
 621 {
 622         struct afb_hook_xreq **prv;
 623
 624         if (hook) {
 625                 pthread_rwlock_wrlock(&rwlock);
 626                 if (--hook->refcount)
 627                         hook = NULL;
 628                 else {
 629                         /* unlink */
 630                         prv = &list_of_xreq_hooks;
 631                         while (*prv && *prv != hook)
 632                                 prv = &(*prv)->next;
 633                         if(*prv)
 634                                 *prv = hook->next;
 635                 }
 636                 pthread_rwlock_unlock(&rwlock);
 637                 if (hook) {
 638                         /* free */
 639                         free(hook->api);
 640                         free(hook->verb);
 641                         if (hook->session)
 642                                 afb_session_unref(hook->session);
 643                         free(hook);
 644                 }
 645         }
 646 }
 647
 648 /******************************************************************************
 649  * section: default callbacks for tracing daemon interface
 650  *****************************************************************************/
 651
 652 static void _hook_ditf_(const struct afb_export *export, const char *format, ...)
 653 {
 654         va_list ap;
 655         va_start(ap, format);
 656         _hook_("export-%s", format, ap, afb_export_apiname(export));
 657         va_end(ap);
 658 }
 659
 660 static void hook_ditf_event_broadcast_before_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *name, struct json_object *object)
 661 {
 662         _hook_ditf_(export, "event_broadcast.before(%s, %s)....", name, json_object_to_json_string(object));
 663 }
 664
 665 static void hook_ditf_event_broadcast_after_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *name, struct json_object *object, int result)
 666 {
 667         _hook_ditf_(export, "event_broadcast.after(%s, %s) -> %d", name, json_object_to_json_string(object), result);
 668 }
 669
 670 static void hook_ditf_get_event_loop_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, struct sd_event *result)
 671 {
 672         _hook_ditf_(export, "get_event_loop() -> %p", result);
 673 }
 674
 675 static void hook_ditf_get_user_bus_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, struct sd_bus *result)
 676 {
 677         _hook_ditf_(export, "get_user_bus() -> %p", result);
 678 }
 679
 680 static void hook_ditf_get_system_bus_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, struct sd_bus *result)
 681 {
 682         _hook_ditf_(export, "get_system_bus() -> %p", result);
 683 }
 684
 685 static void hook_ditf_vverbose_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int level, const char *file, int line, const char *function, const char *fmt, va_list args)
 686 {
 687         int len;
 688         char *msg;
 689         va_list ap;
 690
 691         va_copy(ap, args);
 692         len = vasprintf(&msg, fmt, ap);
 693         va_end(ap);
 694
 695         if (len < 0)
 696                 _hook_ditf_(export, "vverbose(%d, %s, %d, %s) -> %s ? ? ?", level, file, line, function, fmt);
 697         else {
 698                 _hook_ditf_(export, "vverbose(%d, %s, %d, %s) -> %s", level, file, line, function, msg);
 699                 free(msg);
 700         }
 701 }
 702
 703 static void hook_ditf_event_make_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *name, struct afb_event result)
 704 {
 705         _hook_ditf_(export, "event_make(%s) -> %s:%d", name, afb_evt_event_name(result), afb_evt_event_id(result));
 706 }
 707
 708 static void hook_ditf_rootdir_get_fd_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int result)
 709 {
 710         char path[PATH_MAX];
 711         if (result < 0)
 712                 _hook_ditf_(export, "rootdir_get_fd() -> %d, %m", result);
 713         else {
 714                 sprintf(path, "/proc/self/fd/%d", result);
 715                 readlink(path, path, sizeof path);
 716                 _hook_ditf_(export, "rootdir_get_fd() -> %d = %s", result, path);
 717         }
 718 }
 719
 720 static void hook_ditf_rootdir_open_locale_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *filename, int flags, const char *locale, int result)
 721 {
 722         char path[PATH_MAX];
 723         if (!locale)
 724                 locale = "(null)";
 725         if (result < 0)
 726                 _hook_ditf_(export, "rootdir_open_locale(%s, %d, %s) -> %d, %m", filename, flags, locale, result);
 727         else {
 728                 sprintf(path, "/proc/self/fd/%d", result);
 729                 readlink(path, path, sizeof path);
 730                 _hook_ditf_(export, "rootdir_open_locale(%s, %d, %s) -> %d = %s", filename, flags, locale, result, path);
 731         }
 732 }
 733
 734 static void hook_ditf_queue_job_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, void (*callback)(int signum, void *arg), void *argument, void *group, int timeout, int result)
 735 {
 736         _hook_ditf_(export, "queue_job(%p, %p, %p, %d) -> %d", callback, argument, group, timeout, result);
 737 }
 738
 739 static void hook_ditf_unstore_req_cb(void *closure, const struct afb_hookid *hookid,  const struct afb_export *export, struct afb_stored_req *sreq)
 740 {
 741         _hook_ditf_(export, "unstore_req(%p)", sreq);
 742 }
 743
 744 static void hook_ditf_require_api_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *name, int initialized)
 745 {
 746         _hook_ditf_(export, "require_api(%s, %d)...", name, initialized);
 747 }
 748
 749 static void hook_ditf_require_api_result_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *name, int initialized, int result)
 750 {
 751         _hook_ditf_(export, "...require_api(%s, %d) -> %d", name, initialized, result);
 752 }
 753
 754 static void hook_ditf_rename_api_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *oldname, const char *newname, int result)
 755 {
 756         _hook_ditf_(export, "rename_api(%s -> %s) -> %d", oldname, newname, result);
 757 }
 758
 759 static struct afb_hook_ditf_itf hook_ditf_default_itf = {
 760         .hook_ditf_event_broadcast_before = hook_ditf_event_broadcast_before_cb,
 761         .hook_ditf_event_broadcast_after = hook_ditf_event_broadcast_after_cb,
 762         .hook_ditf_get_event_loop = hook_ditf_get_event_loop_cb,
 763         .hook_ditf_get_user_bus = hook_ditf_get_user_bus_cb,
 764         .hook_ditf_get_system_bus = hook_ditf_get_system_bus_cb,
 765         .hook_ditf_vverbose = hook_ditf_vverbose_cb,
 766         .hook_ditf_event_make = hook_ditf_event_make_cb,
 767         .hook_ditf_rootdir_get_fd = hook_ditf_rootdir_get_fd_cb,
 768         .hook_ditf_rootdir_open_locale = hook_ditf_rootdir_open_locale_cb,
 769         .hook_ditf_queue_job = hook_ditf_queue_job_cb,
 770         .hook_ditf_unstore_req = hook_ditf_unstore_req_cb,
 771         .hook_ditf_require_api = hook_ditf_require_api_cb,
 772         .hook_ditf_require_api_result = hook_ditf_require_api_result_cb,
 773         .hook_ditf_rename_api = hook_ditf_rename_api_cb
 774 };
 775
 776 /******************************************************************************
 777  * section: hooks for tracing daemon interface (export)
 778  *****************************************************************************/
 779
 780 #define _HOOK_DITF_(what,...)   \
 781         struct afb_hook_ditf *hook; \
 782         struct afb_hookid hookid; \
 783         const char *apiname = afb_export_apiname(export); \
 784         pthread_rwlock_rdlock(&rwlock); \
 785         init_hookid(&hookid); \
 786         hook = list_of_ditf_hooks; \
 787         while (hook) { \
 788                 if (hook->itf->hook_ditf_##what \
 789                  && (hook->flags & afb_hook_flag_ditf_##what) != 0 \
 790                  && (!hook->api || !strcasecmp(hook->api, apiname))) { \
 791                         hook->itf->hook_ditf_##what(hook->closure, &hookid, __VA_ARGS__); \
 792                 } \
 793                 hook = hook->next; \
 794         } \
 795         pthread_rwlock_unlock(&rwlock);
 796
 797 void afb_hook_ditf_event_broadcast_before(const struct afb_export *export, const char *name, struct json_object *object)
 798 {
 799         _HOOK_DITF_(event_broadcast_before, export, name, object);
 800 }
 801
 802 int afb_hook_ditf_event_broadcast_after(const struct afb_export *export, const char *name, struct json_object *object, int result)
 803 {
 804         _HOOK_DITF_(event_broadcast_after, export, name, object, result);
 805         return result;
 806 }
 807
 808 struct sd_event *afb_hook_ditf_get_event_loop(const struct afb_export *export, struct sd_event *result)
 809 {
 810         _HOOK_DITF_(get_event_loop, export, result);
 811         return result;
 812 }
 813
 814 struct sd_bus *afb_hook_ditf_get_user_bus(const struct afb_export *export, struct sd_bus *result)
 815 {
 816         _HOOK_DITF_(get_user_bus, export, result);
 817         return result;
 818 }
 819
 820 struct sd_bus *afb_hook_ditf_get_system_bus(const struct afb_export *export, struct sd_bus *result)
 821 {
 822         _HOOK_DITF_(get_system_bus, export, result);
 823         return result;
 824 }
 825
 826 void afb_hook_ditf_vverbose(const struct afb_export *export, int level, const char *file, int line, const char *function, const char *fmt, va_list args)
 827 {
 828         _HOOK_DITF_(vverbose, export, level, file, line, function, fmt, args);
 829 }
 830
 831 struct afb_event afb_hook_ditf_event_make(const struct afb_export *export, const char *name, struct afb_event result)
 832 {
 833         _HOOK_DITF_(event_make, export, name, result);
 834         return result;
 835 }
 836
 837 int afb_hook_ditf_rootdir_get_fd(const struct afb_export *export, int result)
 838 {
 839         _HOOK_DITF_(rootdir_get_fd, export, result);
 840         return result;
 841 }
 842
 843 int afb_hook_ditf_rootdir_open_locale(const struct afb_export *export, const char *filename, int flags, const char *locale, int result)
 844 {
 845         _HOOK_DITF_(rootdir_open_locale, export, filename, flags, locale, result);
 846         return result;
 847 }
 848
 849 int afb_hook_ditf_queue_job(const struct afb_export *export, void (*callback)(int signum, void *arg), void *argument, void *group, int timeout, int result)
 850 {
 851         _HOOK_DITF_(queue_job, export, callback, argument, group, timeout, result);
 852         return result;
 853 }
 854
 855 void afb_hook_ditf_unstore_req(const struct afb_export *export, struct afb_stored_req *sreq)
 856 {
 857         _HOOK_DITF_(unstore_req, export, sreq);
 858 }
 859
 860 void afb_hook_ditf_require_api(const struct afb_export *export, const char *name, int initialized)
 861 {
 862         _HOOK_DITF_(require_api, export, name, initialized);
 863 }
 864
 865 int afb_hook_ditf_require_api_result(const struct afb_export *export, const char *name, int initialized, int result)
 866 {
 867         _HOOK_DITF_(require_api_result, export, name, initialized, result);
 868         return result;
 869 }
 870
 871 int afb_hook_ditf_rename_api(const struct afb_export *export, const char *oldname, const char *newname, int result)
 872 {
 873         _HOOK_DITF_(rename_api, export, oldname, newname, result);
 874         return result;
 875 }
 876
 877 /******************************************************************************
 878  * section: hooking export
 879  *****************************************************************************/
 880
 881 int afb_hook_flags_ditf(const char *api)
 882 {
 883         int flags;
 884         struct afb_hook_ditf *hook;
 885
 886         pthread_rwlock_rdlock(&rwlock);
 887         flags = 0;
 888         hook = list_of_ditf_hooks;
 889         while (hook) {
 890                 if (!api || !hook->api || !strcasecmp(hook->api, api))
 891                         flags |= hook->flags;
 892                 hook = hook->next;
 893         }
 894         pthread_rwlock_unlock(&rwlock);
 895         return flags;
 896 }
 897
 898 struct afb_hook_ditf *afb_hook_create_ditf(const char *api, int flags, struct afb_hook_ditf_itf *itf, void *closure)
 899 {
 900         struct afb_hook_ditf *hook;
 901
 902         /* alloc the result */
 903         hook = calloc(1, sizeof *hook);
 904         if (hook == NULL)
 905                 return NULL;
 906
 907         /* get a copy of the names */
 908         hook->api = api ? strdup(api) : NULL;
 909         if (api && !hook->api) {
 910                 free(hook);
 911                 return NULL;
 912         }
 913
 914         /* initialise the rest */
 915         hook->refcount = 1;
 916         hook->flags = flags;
 917         hook->itf = itf ? itf : &hook_ditf_default_itf;
 918         hook->closure = closure;
 919
 920         /* record the hook */
 921         pthread_rwlock_wrlock(&rwlock);
 922         hook->next = list_of_ditf_hooks;
 923         list_of_ditf_hooks = hook;
 924         pthread_rwlock_unlock(&rwlock);
 925
 926         /* returns it */
 927         return hook;
 928 }
 929
 930 struct afb_hook_ditf *afb_hook_addref_ditf(struct afb_hook_ditf *hook)
 931 {
 932         pthread_rwlock_wrlock(&rwlock);
 933         hook->refcount++;
 934         pthread_rwlock_unlock(&rwlock);
 935         return hook;
 936 }
 937
 938 void afb_hook_unref_ditf(struct afb_hook_ditf *hook)
 939 {
 940         struct afb_hook_ditf **prv;
 941
 942         if (hook) {
 943                 pthread_rwlock_wrlock(&rwlock);
 944                 if (--hook->refcount)
 945                         hook = NULL;
 946                 else {
 947                         /* unlink */
 948                         prv = &list_of_ditf_hooks;
 949                         while (*prv && *prv != hook)
 950                                 prv = &(*prv)->next;
 951                         if(*prv)
 952                                 *prv = hook->next;
 953                 }
 954                 pthread_rwlock_unlock(&rwlock);
 955                 if (hook) {
 956                         /* free */
 957                         free(hook->api);
 958                         free(hook);
 959                 }
 960         }
 961 }
 962
 963 /******************************************************************************
 964  * section: default callbacks for tracing service interface (export)
 965  *****************************************************************************/
 966
 967 static void _hook_svc_(const struct afb_export *export, const char *format, ...)
 968 {
 969         va_list ap;
 970         va_start(ap, format);
 971         _hook_("export-%s", format, ap, afb_export_apiname(export));
 972         va_end(ap);
 973 }
 974
 975 static void hook_svc_start_before_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export)
 976 {
 977         _hook_svc_(export, "start.before");
 978 }
 979
 980 static void hook_svc_start_after_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int status)
 981 {
 982         _hook_svc_(export, "start.after -> %d", status);
 983 }
 984
 985 static void hook_svc_on_event_before_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *event, int eventid, struct json_object *object)
 986 {
 987         _hook_svc_(export, "on_event.before(%s, %d, %s)", event, eventid, json_object_to_json_string(object));
 988 }
 989
 990 static void hook_svc_on_event_after_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *event, int eventid, struct json_object *object)
 991 {
 992         _hook_svc_(export, "on_event.after(%s, %d, %s)", event, eventid, json_object_to_json_string(object));
 993 }
 994
 995 static void hook_svc_call_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *api, const char *verb, struct json_object *args)
 996 {
 997         _hook_svc_(export, "call(%s/%s, %s) ...", api, verb, json_object_to_json_string(args));
 998 }
 999
1000 static void hook_svc_call_result_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int status, struct json_object *result)
1001 {
1002         _hook_svc_(export, "    ...call... -> %d: %s", status, json_object_to_json_string(result));
1003 }
1004
1005 static void hook_svc_callsync_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *api, const char *verb, struct json_object *args)
1006 {
1007         _hook_svc_(export, "callsync(%s/%s, %s) ...", api, verb, json_object_to_json_string(args));
1008 }
1009
1010 static void hook_svc_callsync_result_default_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int status, struct json_object *result)
1011 {
1012         _hook_svc_(export, "    ...callsync... -> %d: %s", status, json_object_to_json_string(result));
1013 }
1014
1015 static struct afb_hook_svc_itf hook_svc_default_itf = {
1016         .hook_svc_start_before = hook_svc_start_before_default_cb,
1017         .hook_svc_start_after = hook_svc_start_after_default_cb,
1018         .hook_svc_on_event_before = hook_svc_on_event_before_default_cb,
1019         .hook_svc_on_event_after = hook_svc_on_event_after_default_cb,
1020         .hook_svc_call = hook_svc_call_default_cb,
1021         .hook_svc_call_result = hook_svc_call_result_default_cb,
1022         .hook_svc_callsync = hook_svc_callsync_default_cb,
1023         .hook_svc_callsync_result = hook_svc_callsync_result_default_cb
1024 };
1025
1026 /******************************************************************************
1027  * section: hooks for tracing service interface (export)
1028  *****************************************************************************/
1029
1030 #define _HOOK_SVC_(what,...)   \
1031         struct afb_hook_svc *hook; \
1032         struct afb_hookid hookid; \
1033         const char *apiname = afb_export_apiname(export); \
1034         pthread_rwlock_rdlock(&rwlock); \
1035         init_hookid(&hookid); \
1036         hook = list_of_svc_hooks; \
1037         while (hook) { \
1038                 if (hook->itf->hook_svc_##what \
1039                  && (hook->flags & afb_hook_flag_svc_##what) != 0 \
1040                  && (!hook->api || !strcasecmp(hook->api, apiname))) { \
1041                         hook->itf->hook_svc_##what(hook->closure, &hookid, __VA_ARGS__); \
1042                 } \
1043                 hook = hook->next; \
1044         } \
1045         pthread_rwlock_unlock(&rwlock);
1046
1047 void afb_hook_svc_start_before(const struct afb_export *export)
1048 {
1049         _HOOK_SVC_(start_before, export);
1050 }
1051
1052 int afb_hook_svc_start_after(const struct afb_export *export, int status)
1053 {
1054         _HOOK_SVC_(start_after, export, status);
1055         return status;
1056 }
1057
1058 void afb_hook_svc_on_event_before(const struct afb_export *export, const char *event, int eventid, struct json_object *object)
1059 {
1060         _HOOK_SVC_(on_event_before, export, event, eventid, object);
1061 }
1062
1063 void afb_hook_svc_on_event_after(const struct afb_export *export, const char *event, int eventid, struct json_object *object)
1064 {
1065         _HOOK_SVC_(on_event_after, export, event, eventid, object);
1066 }
1067
1068 void afb_hook_svc_call(const struct afb_export *export, const char *api, const char *verb, struct json_object *args)
1069 {
1070         _HOOK_SVC_(call, export, api, verb, args);
1071 }
1072
1073 void afb_hook_svc_call_result(const struct afb_export *export, int status, struct json_object *result)
1074 {
1075         _HOOK_SVC_(call_result, export, status, result);
1076 }
1077
1078 void afb_hook_svc_callsync(const struct afb_export *export, const char *api, const char *verb, struct json_object *args)
1079 {
1080         _HOOK_SVC_(callsync, export, api, verb, args);
1081 }
1082
1083 int afb_hook_svc_callsync_result(const struct afb_export *export, int status, struct json_object *result)
1084 {
1085         _HOOK_SVC_(callsync_result, export, status, result);
1086         return status;
1087 }
1088
1089 /******************************************************************************
1090  * section: hooking services (export)
1091  *****************************************************************************/
1092
1093 int afb_hook_flags_svc(const char *api)
1094 {
1095         int flags;
1096         struct afb_hook_svc *hook;
1097
1098         pthread_rwlock_rdlock(&rwlock);
1099         flags = 0;
1100         hook = list_of_svc_hooks;
1101         while (hook) {
1102                 if (!api || !hook->api || !strcasecmp(hook->api, api))
1103                         flags |= hook->flags;
1104                 hook = hook->next;
1105         }
1106         pthread_rwlock_unlock(&rwlock);
1107         return flags;
1108 }
1109
1110 struct afb_hook_svc *afb_hook_create_svc(const char *api, int flags, struct afb_hook_svc_itf *itf, void *closure)
1111 {
1112         struct afb_hook_svc *hook;
1113
1114         /* alloc the result */
1115         hook = calloc(1, sizeof *hook);
1116         if (hook == NULL)
1117                 return NULL;
1118
1119         /* get a copy of the names */
1120         hook->api = api ? strdup(api) : NULL;
1121         if (api && !hook->api) {
1122                 free(hook);
1123                 return NULL;
1124         }
1125
1126         /* initialise the rest */
1127         hook->refcount = 1;
1128         hook->flags = flags;
1129         hook->itf = itf ? itf : &hook_svc_default_itf;
1130         hook->closure = closure;
1131
1132         /* record the hook */
1133         pthread_rwlock_wrlock(&rwlock);
1134         hook->next = list_of_svc_hooks;
1135         list_of_svc_hooks = hook;
1136         pthread_rwlock_unlock(&rwlock);
1137
1138         /* returns it */
1139         return hook;
1140 }
1141
1142 struct afb_hook_svc *afb_hook_addref_svc(struct afb_hook_svc *hook)
1143 {
1144         pthread_rwlock_wrlock(&rwlock);
1145         hook->refcount++;
1146         pthread_rwlock_unlock(&rwlock);
1147         return hook;
1148 }
1149
1150 void afb_hook_unref_svc(struct afb_hook_svc *hook)
1151 {
1152         struct afb_hook_svc **prv;
1153
1154         if (hook) {
1155                 pthread_rwlock_wrlock(&rwlock);
1156                 if (--hook->refcount)
1157                         hook = NULL;
1158                 else {
1159                         /* unlink */
1160                         prv = &list_of_svc_hooks;
1161                         while (*prv && *prv != hook)
1162                                 prv = &(*prv)->next;
1163                         if(*prv)
1164                                 *prv = hook->next;
1165                 }
1166                 pthread_rwlock_unlock(&rwlock);
1167                 if (hook) {
1168                         /* free */
1169                         free(hook->api);
1170                         free(hook);
1171                 }
1172         }
1173 }
1174
1175 /******************************************************************************
1176  * section: default callbacks for tracing service interface (evt)
1177  *****************************************************************************/
1178
1179 static void _hook_evt_(const char *evt, int id, const char *format, ...)
1180 {
1181         va_list ap;
1182         va_start(ap, format);
1183         _hook_("evt-%s:%d", format, ap, evt, id);
1184         va_end(ap);
1185 }
1186
1187 static void hook_evt_create_default_cb(void *closure, const struct afb_hookid *hookid, const char *evt, int id)
1188 {
1189         _hook_evt_(evt, id, "create");
1190 }
1191
1192 static void hook_evt_push_before_default_cb(void *closure, const struct afb_hookid *hookid, const char *evt, int id, struct json_object *obj)
1193 {
1194         _hook_evt_(evt, id, "push.before(%s)", json_object_to_json_string(obj));
1195 }
1196
1197
1198 static void hook_evt_push_after_default_cb(void *closure, const struct afb_hookid *hookid, const char *evt, int id, struct json_object *obj, int result)
1199 {
1200         _hook_evt_(evt, id, "push.after(%s) -> %d", json_object_to_json_string(obj), result);
1201 }
1202
1203 static void hook_evt_broadcast_before_default_cb(void *closure, const struct afb_hookid *hookid, const char *evt, int id, struct json_object *obj)
1204 {
1205         _hook_evt_(evt, id, "broadcast.before(%s)", json_object_to_json_string(obj));
1206 }
1207
1208 static void hook_evt_broadcast_after_default_cb(void *closure, const struct afb_hookid *hookid, const char *evt, int id, struct json_object *obj, int result)
1209 {
1210         _hook_evt_(evt, id, "broadcast.after(%s) -> %d", json_object_to_json_string(obj), result);
1211 }
1212
1213 static void hook_evt_name_default_cb(void *closure, const struct afb_hookid *hookid, const char *evt, int id)
1214 {
1215         _hook_evt_(evt, id, "name");
1216 }
1217
1218 static void hook_evt_drop_default_cb(void *closure, const struct afb_hookid *hookid, const char *evt, int id)
1219 {
1220         _hook_evt_(evt, id, "drop");
1221 }
1222
1223 static struct afb_hook_evt_itf hook_evt_default_itf = {
1224         .hook_evt_create = hook_evt_create_default_cb,
1225         .hook_evt_push_before = hook_evt_push_before_default_cb,
1226         .hook_evt_push_after = hook_evt_push_after_default_cb,
1227         .hook_evt_broadcast_before = hook_evt_broadcast_before_default_cb,
1228         .hook_evt_broadcast_after = hook_evt_broadcast_after_default_cb,
1229         .hook_evt_name = hook_evt_name_default_cb,
1230         .hook_evt_drop = hook_evt_drop_default_cb
1231 };
1232
1233 /******************************************************************************
1234  * section: hooks for tracing events interface (evt)
1235  *****************************************************************************/
1236
1237 #define _HOOK_EVT_(what,...)   \
1238         struct afb_hook_evt *hook; \
1239         struct afb_hookid hookid; \
1240         pthread_rwlock_rdlock(&rwlock); \
1241         init_hookid(&hookid); \
1242         hook = list_of_evt_hooks; \
1243         while (hook) { \
1244                 if (hook->itf->hook_evt_##what \
1245                  && (hook->flags & afb_hook_flag_evt_##what) != 0 \
1246                  && (!hook->pattern || !fnmatch(hook->pattern, evt, FNM_CASEFOLD))) { \
1247                         hook->itf->hook_evt_##what(hook->closure, &hookid, __VA_ARGS__); \
1248                 } \
1249                 hook = hook->next; \
1250         } \
1251         pthread_rwlock_unlock(&rwlock);
1252
1253 void afb_hook_evt_create(const char *evt, int id)
1254 {
1255         _HOOK_EVT_(create, evt, id);
1256 }
1257
1258 void afb_hook_evt_push_before(const char *evt, int id, struct json_object *obj)
1259 {
1260         _HOOK_EVT_(push_before, evt, id, obj);
1261 }
1262
1263 int afb_hook_evt_push_after(const char *evt, int id, struct json_object *obj, int result)
1264 {
1265         _HOOK_EVT_(push_after, evt, id, obj, result);
1266         return result;
1267 }
1268
1269 void afb_hook_evt_broadcast_before(const char *evt, int id, struct json_object *obj)
1270 {
1271         _HOOK_EVT_(broadcast_before, evt, id, obj);
1272 }
1273
1274 int afb_hook_evt_broadcast_after(const char *evt, int id, struct json_object *obj, int result)
1275 {
1276         _HOOK_EVT_(broadcast_after, evt, id, obj, result);
1277         return result;
1278 }
1279
1280 void afb_hook_evt_name(const char *evt, int id)
1281 {
1282         _HOOK_EVT_(name, evt, id);
1283 }
1284
1285 void afb_hook_evt_drop(const char *evt, int id)
1286 {
1287         _HOOK_EVT_(drop, evt, id);
1288 }
1289
1290 /******************************************************************************
1291  * section: hooking services (evt)
1292  *****************************************************************************/
1293
1294 int afb_hook_flags_evt(const char *name)
1295 {
1296         int flags;
1297         struct afb_hook_evt *hook;
1298
1299         pthread_rwlock_rdlock(&rwlock);
1300         flags = 0;
1301         hook = list_of_evt_hooks;
1302         while (hook) {
1303                 if (!name || !hook->pattern || !fnmatch(hook->pattern, name, FNM_CASEFOLD))
1304                         flags |= hook->flags;
1305                 hook = hook->next;
1306         }
1307         pthread_rwlock_unlock(&rwlock);
1308         return flags;
1309 }
1310
1311 struct afb_hook_evt *afb_hook_create_evt(const char *pattern, int flags, struct afb_hook_evt_itf *itf, void *closure)
1312 {
1313         struct afb_hook_evt *hook;
1314
1315         /* alloc the result */
1316         hook = calloc(1, sizeof *hook);
1317         if (hook == NULL)
1318                 return NULL;
1319
1320         /* get a copy of the names */
1321         hook->pattern = pattern ? strdup(pattern) : NULL;
1322         if (pattern && !hook->pattern) {
1323                 free(hook);
1324                 return NULL;
1325         }
1326
1327         /* initialise the rest */
1328         hook->refcount = 1;
1329         hook->flags = flags;
1330         hook->itf = itf ? itf : &hook_evt_default_itf;
1331         hook->closure = closure;
1332
1333         /* record the hook */
1334         pthread_rwlock_wrlock(&rwlock);
1335         hook->next = list_of_evt_hooks;
1336         list_of_evt_hooks = hook;
1337         pthread_rwlock_unlock(&rwlock);
1338
1339         /* returns it */
1340         return hook;
1341 }
1342
1343 struct afb_hook_evt *afb_hook_addref_evt(struct afb_hook_evt *hook)
1344 {
1345         pthread_rwlock_wrlock(&rwlock);
1346         hook->refcount++;
1347         pthread_rwlock_unlock(&rwlock);
1348         return hook;
1349 }
1350
1351 void afb_hook_unref_evt(struct afb_hook_evt *hook)
1352 {
1353         struct afb_hook_evt **prv;
1354
1355         if (hook) {
1356                 pthread_rwlock_wrlock(&rwlock);
1357                 if (--hook->refcount)
1358                         hook = NULL;
1359                 else {
1360                         /* unlink */
1361                         prv = &list_of_evt_hooks;
1362                         while (*prv && *prv != hook)
1363                                 prv = &(*prv)->next;
1364                         if(*prv)
1365                                 *prv = hook->next;
1366                 }
1367                 pthread_rwlock_unlock(&rwlock);
1368                 if (hook) {
1369                         /* free */
1370                         free(hook->pattern);
1371                         free(hook);
1372                 }
1373         }
1374 }
1375
1376 /******************************************************************************
1377  * section: default callbacks for globals (global)
1378  *****************************************************************************/
1379
1380 static void _hook_global_(const char *format, ...)
1381 {
1382         va_list ap;
1383         va_start(ap, format);
1384         _hook_("global", format, ap);
1385         va_end(ap);
1386 }
1387
1388 static void hook_global_vverbose_default_cb(void *closure, const struct afb_hookid *hookid, int level, const char *file, int line, const char *func, const char *fmt, va_list args)
1389 {
1390         int len;
1391         char *msg;
1392         va_list ap;
1393
1394         va_copy(ap, args);
1395         len = vasprintf(&msg, fmt, ap);
1396         va_end(ap);
1397
1398         if (len < 0)
1399                 _hook_global_("vverbose(%d, %s, %d, %s) -> %s ? ? ?", level, file, line, func, fmt);
1400         else {
1401                 _hook_global_("vverbose(%d, %s, %d, %s) -> %s", level, file, line, func, msg);
1402                 free(msg);
1403         }
1404 }
1405
1406 static struct afb_hook_global_itf hook_global_default_itf = {
1407         .hook_global_vverbose = hook_global_vverbose_default_cb
1408 };
1409
1410 /******************************************************************************
1411  * section: hooks for tracing globals (global)
1412  *****************************************************************************/
1413
1414 #define _HOOK_GLOBAL_(what,...)   \
1415         struct afb_hook_global *hook; \
1416         struct afb_hookid hookid; \
1417         pthread_rwlock_rdlock(&rwlock); \
1418         init_hookid(&hookid); \
1419         hook = list_of_global_hooks; \
1420         while (hook) { \
1421                 if (hook->itf->hook_global_##what \
1422                  && (hook->flags & afb_hook_flag_global_##what) != 0) { \
1423                         hook->itf->hook_global_##what(hook->closure, &hookid, __VA_ARGS__); \
1424                 } \
1425                 hook = hook->next; \
1426         } \
1427         pthread_rwlock_unlock(&rwlock);
1428
1429 static void afb_hook_global_vverbose(int level, const char *file, int line, const char *func, const char *fmt, va_list args)
1430 {
1431         _HOOK_GLOBAL_(vverbose, level, file ?: "?", line, func ?: "?", fmt ?: "", args);
1432 }
1433
1434 /******************************************************************************
1435  * section: hooking globals (global)
1436  *****************************************************************************/
1437
1438 static void update_global()
1439 {
1440         struct afb_hook_global *hook;
1441         int flags = 0;
1442
1443         pthread_rwlock_rdlock(&rwlock);
1444         hook = list_of_global_hooks;
1445         while (hook) {
1446                 flags = hook->flags;
1447                 hook = hook->next;
1448         }
1449         verbose_observer = (flags & afb_hook_flag_global_vverbose) ? afb_hook_global_vverbose : NULL;
1450         pthread_rwlock_unlock(&rwlock);
1451 }
1452
1453 struct afb_hook_global *afb_hook_create_global(int flags, struct afb_hook_global_itf *itf, void *closure)
1454 {
1455         struct afb_hook_global *hook;
1456
1457         /* alloc the result */
1458         hook = calloc(1, sizeof *hook);
1459         if (hook == NULL)
1460                 return NULL;
1461
1462         /* initialise the rest */
1463         hook->refcount = 1;
1464         hook->flags = flags;
1465         hook->itf = itf ? itf : &hook_global_default_itf;
1466         hook->closure = closure;
1467
1468         /* record the hook */
1469         pthread_rwlock_wrlock(&rwlock);
1470         hook->next = list_of_global_hooks;
1471         list_of_global_hooks = hook;
1472         pthread_rwlock_unlock(&rwlock);
1473
1474         /* update hooking */
1475         update_global();
1476
1477         /* returns it */
1478         return hook;
1479 }
1480
1481 struct afb_hook_global *afb_hook_addref_global(struct afb_hook_global *hook)
1482 {
1483         pthread_rwlock_wrlock(&rwlock);
1484         hook->refcount++;
1485         pthread_rwlock_unlock(&rwlock);
1486         return hook;
1487 }
1488
1489 void afb_hook_unref_global(struct afb_hook_global *hook)
1490 {
1491         struct afb_hook_global **prv;
1492
1493         if (hook) {
1494                 pthread_rwlock_wrlock(&rwlock);
1495                 if (--hook->refcount)
1496                         hook = NULL;
1497                 else {
1498                         /* unlink */
1499                         prv = &list_of_global_hooks;
1500                         while (*prv && *prv != hook)
1501                                 prv = &(*prv)->next;
1502                         if(*prv)
1503                                 *prv = hook->next;
1504                 }
1505                 pthread_rwlock_unlock(&rwlock);
1506                 if (hook) {
1507                         /* free */
1508                         free(hook);
1509
1510                         /* update hooking */
1511                         update_global();
1512                 }
1513         }
1514 }
1515