src/afb-xreq.c

   1 /*
   2  * Copyright (C) 2017-2019 "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 <stdlib.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <errno.h>
  24 #include <stdarg.h>
  25
  26 #include <json-c/json.h>
  27 #if !defined(JSON_C_TO_STRING_NOSLASHESCAPE)
  28 #define JSON_C_TO_STRING_NOSLASHESCAPE 0
  29 #endif
  30
  31 #include <afb/afb-binding-v1.h>
  32 #include <afb/afb-binding-v2.h>
  33 #include <afb/afb-binding-v3.h>
  34 #include <afb/afb-req-x2.h>
  35
  36 #include "afb-api.h"
  37 #include "afb-apiset.h"
  38 #include "afb-auth.h"
  39 #include "afb-calls.h"
  40 #include "afb-context.h"
  41 #include "afb-evt.h"
  42 #include "afb-cred.h"
  43 #include "afb-hook.h"
  44 #include "afb-msg-json.h"
  45 #include "afb-xreq.h"
  46
  47 #include "jobs.h"
  48 #include "verbose.h"
  49
  50 /******************************************************************************/
  51
  52 static void xreq_finalize(struct afb_xreq *xreq)
  53 {
  54         if (!xreq->replied)
  55                 afb_xreq_reply(xreq, NULL, "error", "no reply");
  56 #if WITH_AFB_HOOK
  57         if (xreq->hookflags)
  58                 afb_hook_xreq_end(xreq);
  59 #endif
  60         if (xreq->caller)
  61                 afb_xreq_unhooked_unref(xreq->caller);
  62         xreq->queryitf->unref(xreq);
  63 }
  64
  65 inline void afb_xreq_unhooked_addref(struct afb_xreq *xreq)
  66 {
  67         __atomic_add_fetch(&xreq->refcount, 1, __ATOMIC_RELAXED);
  68 }
  69
  70 inline void afb_xreq_unhooked_unref(struct afb_xreq *xreq)
  71 {
  72         if (!__atomic_sub_fetch(&xreq->refcount, 1, __ATOMIC_RELAXED))
  73                 xreq_finalize(xreq);
  74 }
  75
  76 /******************************************************************************/
  77
  78 struct json_object *afb_xreq_unhooked_json(struct afb_xreq *xreq)
  79 {
  80         if (!xreq->json && xreq->queryitf->json)
  81                 xreq->json = xreq->queryitf->json(xreq);
  82         return xreq->json;
  83 }
  84
  85 static struct json_object *xreq_json_cb(struct afb_req_x2 *closure)
  86 {
  87         struct afb_xreq *xreq = xreq_from_req_x2(closure);
  88         return afb_xreq_unhooked_json(xreq);
  89 }
  90
  91 static struct afb_arg xreq_get_cb(struct afb_req_x2 *closure, const char *name)
  92 {
  93         struct afb_xreq *xreq = xreq_from_req_x2(closure);
  94         struct afb_arg arg;
  95         struct json_object *object, *value;
  96
  97         if (xreq->queryitf->get)
  98                 arg = xreq->queryitf->get(xreq, name);
  99         else {
 100                 object = xreq_json_cb(closure);
 101                 if (json_object_object_get_ex(object, name, &value)) {
 102                         arg.name = name;
 103                         arg.value = json_object_get_string(value);
 104                 } else {
 105                         arg.name = NULL;
 106                         arg.value = NULL;
 107                 }
 108                 arg.path = NULL;
 109         }
 110         return arg;
 111 }
 112
 113 static void xreq_reply_cb(struct afb_req_x2 *closure, struct json_object *obj, const char *error, const char *info)
 114 {
 115         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 116
 117         if (xreq->replied) {
 118                 ERROR("reply called more than one time!!");
 119                 json_object_put(obj);
 120         } else {
 121                 xreq->replied = 1;
 122                 xreq->queryitf->reply(xreq, obj, error, info);
 123         }
 124 }
 125
 126 static void xreq_vreply_cb(struct afb_req_x2 *closure, struct json_object *obj, const char *error, const char *fmt, va_list args)
 127 {
 128         char *info;
 129         if (fmt == NULL || vasprintf(&info, fmt, args) < 0)
 130                 info = NULL;
 131         xreq_reply_cb(closure, obj, error, info);
 132         free(info);
 133 }
 134
 135 static void xreq_legacy_success_cb(struct afb_req_x2 *closure, struct json_object *obj, const char *info)
 136 {
 137         xreq_reply_cb(closure, obj, NULL, info);
 138 }
 139
 140 static void xreq_legacy_fail_cb(struct afb_req_x2 *closure, const char *status, const char *info)
 141 {
 142         xreq_reply_cb(closure, NULL, status, info);
 143 }
 144
 145 static void xreq_legacy_vsuccess_cb(struct afb_req_x2 *closure, struct json_object *obj, const char *fmt, va_list args)
 146 {
 147         xreq_vreply_cb(closure, obj, NULL, fmt, args);
 148 }
 149
 150 static void xreq_legacy_vfail_cb(struct afb_req_x2 *closure, const char *status, const char *fmt, va_list args)
 151 {
 152         xreq_vreply_cb(closure, NULL, status, fmt, args);
 153 }
 154
 155 static void *xreq_legacy_context_get_cb(struct afb_req_x2 *closure)
 156 {
 157         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 158         return afb_context_get(&xreq->context);
 159 }
 160
 161 static void xreq_legacy_context_set_cb(struct afb_req_x2 *closure, void *value, void (*free_value)(void*))
 162 {
 163         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 164         afb_context_set(&xreq->context, value, free_value);
 165 }
 166
 167 static struct afb_req_x2 *xreq_addref_cb(struct afb_req_x2 *closure)
 168 {
 169         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 170         afb_xreq_unhooked_addref(xreq);
 171         return closure;
 172 }
 173
 174 static void xreq_unref_cb(struct afb_req_x2 *closure)
 175 {
 176         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 177         afb_xreq_unhooked_unref(xreq);
 178 }
 179
 180 static void xreq_session_close_cb(struct afb_req_x2 *closure)
 181 {
 182         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 183         afb_context_close(&xreq->context);
 184 }
 185
 186 static int xreq_session_set_LOA_cb(struct afb_req_x2 *closure, unsigned level)
 187 {
 188         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 189         return afb_context_change_loa(&xreq->context, level);
 190 }
 191
 192 static int xreq_subscribe_event_x2_cb(struct afb_req_x2 *closure, struct afb_event_x2 *event)
 193 {
 194         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 195         return afb_xreq_subscribe(xreq, event);
 196 }
 197
 198 static int xreq_legacy_subscribe_event_x1_cb(struct afb_req_x2 *closure, struct afb_event_x1 event)
 199 {
 200         return xreq_subscribe_event_x2_cb(closure, afb_event_x1_to_event_x2(event));
 201 }
 202
 203 int afb_xreq_subscribe(struct afb_xreq *xreq, struct afb_event_x2 *event)
 204 {
 205         if (xreq->replied) {
 206                 ERROR("request replied, subscription impossible");
 207                 errno = EINVAL;
 208         } else {
 209                 if (xreq->listener)
 210                         return afb_evt_event_x2_add_watch(xreq->listener, event);
 211                 if (xreq->queryitf->subscribe)
 212                         return xreq->queryitf->subscribe(xreq, event);
 213                 ERROR("no event listener, subscription impossible");
 214                 errno = ENOTSUP;
 215         }
 216         return -1;
 217 }
 218
 219 static int xreq_unsubscribe_event_x2_cb(struct afb_req_x2 *closure, struct afb_event_x2 *event)
 220 {
 221         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 222         return afb_xreq_unsubscribe(xreq, event);
 223 }
 224
 225 static int xreq_legacy_unsubscribe_event_x1_cb(struct afb_req_x2 *closure, struct afb_event_x1 event)
 226 {
 227         return xreq_unsubscribe_event_x2_cb(closure, afb_event_x1_to_event_x2(event));
 228 }
 229
 230 int afb_xreq_unsubscribe(struct afb_xreq *xreq, struct afb_event_x2 *event)
 231 {
 232         if (xreq->replied) {
 233                 ERROR("request replied, unsubscription impossible");
 234                 errno = EINVAL;
 235         } else {
 236                 if (xreq->listener)
 237                         return afb_evt_event_x2_remove_watch(xreq->listener, event);
 238                 if (xreq->queryitf->unsubscribe)
 239                         return xreq->queryitf->unsubscribe(xreq, event);
 240                 ERROR("no event listener, unsubscription impossible");
 241                 errno = ENOTSUP;
 242         }
 243         return -1;
 244 }
 245
 246 static void xreq_legacy_subcall_cb(struct afb_req_x2 *req, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *closure)
 247 {
 248         struct afb_xreq *xreq = xreq_from_req_x2(req);
 249         return afb_calls_legacy_subcall_v1(xreq, api, verb, args, callback, closure);
 250 }
 251
 252 static void xreq_legacy_subcall_req_cb(struct afb_req_x2 *req, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*, struct afb_req_x1), void *closure)
 253 {
 254         struct afb_xreq *xreq = xreq_from_req_x2(req);
 255         return afb_calls_legacy_subcall_v2(xreq, api, verb, args, callback, closure);
 256 }
 257
 258 static void xreq_legacy_subcall_request_cb(struct afb_req_x2 *req, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*, struct afb_req_x2*), void *closure)
 259 {
 260         struct afb_xreq *xreq = xreq_from_req_x2(req);
 261         return afb_calls_legacy_subcall_v3(xreq, api, verb, args, callback, closure);
 262 }
 263
 264
 265 static int xreq_legacy_subcallsync_cb(struct afb_req_x2 *req, const char *api, const char *verb, struct json_object *args, struct json_object **result)
 266 {
 267         struct afb_xreq *xreq = xreq_from_req_x2(req);
 268         return afb_calls_legacy_subcall_sync(xreq, api, verb, args, result);
 269 }
 270
 271 static void xreq_vverbose_cb(struct afb_req_x2 *closure, int level, const char *file, int line, const char *func, const char *fmt, va_list args)
 272 {
 273         char *p;
 274         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 275
 276         if (!fmt || vasprintf(&p, fmt, args) < 0)
 277                 vverbose(level, file, line, func, fmt, args);
 278         else {
 279                 verbose(level, file, line, func, "[REQ/API %s] %s", xreq->request.called_api, p);
 280                 free(p);
 281         }
 282 }
 283
 284 static struct afb_stored_req *xreq_legacy_store_cb(struct afb_req_x2 *closure)
 285 {
 286         xreq_addref_cb(closure);
 287         return (struct afb_stored_req*)closure;
 288 }
 289
 290 static int xreq_has_permission_cb(struct afb_req_x2 *closure, const char *permission)
 291 {
 292         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 293         return afb_auth_has_permission(xreq, permission);
 294 }
 295
 296 static char *xreq_get_application_id_cb(struct afb_req_x2 *closure)
 297 {
 298         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 299         return xreq->cred && xreq->cred->id ? strdup(xreq->cred->id) : NULL;
 300 }
 301
 302 static void *xreq_context_make_cb(struct afb_req_x2 *closure, int replace, void *(*create_value)(void*), void (*free_value)(void*), void *create_closure)
 303 {
 304         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 305         return afb_context_make(&xreq->context, replace, create_value, free_value, create_closure);
 306 }
 307
 308 static int xreq_get_uid_cb(struct afb_req_x2 *closure)
 309 {
 310         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 311         return xreq->cred && xreq->cred->id ? (int)xreq->cred->uid : -1;
 312 }
 313
 314 static struct json_object *xreq_get_client_info_cb(struct afb_req_x2 *closure)
 315 {
 316         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 317         struct json_object *r = json_object_new_object();
 318         if (xreq->cred && xreq->cred->id) {
 319                 json_object_object_add(r, "uid", json_object_new_int(xreq->cred->uid));
 320                 json_object_object_add(r, "gid", json_object_new_int(xreq->cred->gid));
 321                 json_object_object_add(r, "pid", json_object_new_int(xreq->cred->pid));
 322                 json_object_object_add(r, "user", json_object_new_string(xreq->cred->user));
 323                 json_object_object_add(r, "label", json_object_new_string(xreq->cred->label));
 324                 json_object_object_add(r, "id", json_object_new_string(xreq->cred->id));
 325         }
 326         if (xreq->context.session) {
 327                 json_object_object_add(r, "uuid", json_object_new_string(afb_context_uuid(&xreq->context)));
 328                 json_object_object_add(r, "LOA", json_object_new_int(afb_context_get_loa(&xreq->context)));
 329         }
 330         return r;
 331 }
 332
 333 static void xreq_subcall_cb(
 334                                 struct afb_req_x2 *req,
 335                                 const char *api,
 336                                 const char *verb,
 337                                 struct json_object *args,
 338                                 int flags,
 339                                 void (*callback)(void *closure, struct json_object *object, const char *error, const char * info, struct afb_req_x2 *req),
 340                                 void *closure)
 341 {
 342         struct afb_xreq *xreq = xreq_from_req_x2(req);
 343         afb_calls_subcall(xreq, api, verb, args, flags, callback, closure);
 344 }
 345
 346 static int xreq_subcallsync_cb(
 347                                 struct afb_req_x2 *req,
 348                                 const char *api,
 349                                 const char *verb,
 350                                 struct json_object *args,
 351                                 int flags,
 352                                 struct json_object **object,
 353                                 char **error,
 354                                 char **info)
 355 {
 356         struct afb_xreq *xreq = xreq_from_req_x2(req);
 357         return afb_calls_subcall_sync(xreq, api, verb, args, flags, object, error, info);
 358 }
 359
 360 /******************************************************************************/
 361
 362 const struct afb_req_x2_itf xreq_itf = {
 363         .json = xreq_json_cb,
 364         .get = xreq_get_cb,
 365         .legacy_success = xreq_legacy_success_cb,
 366         .legacy_fail = xreq_legacy_fail_cb,
 367         .legacy_vsuccess = xreq_legacy_vsuccess_cb,
 368         .legacy_vfail = xreq_legacy_vfail_cb,
 369         .legacy_context_get = xreq_legacy_context_get_cb,
 370         .legacy_context_set = xreq_legacy_context_set_cb,
 371         .addref = xreq_addref_cb,
 372         .unref = xreq_unref_cb,
 373         .session_close = xreq_session_close_cb,
 374         .session_set_LOA = xreq_session_set_LOA_cb,
 375         .legacy_subscribe_event_x1 = xreq_legacy_subscribe_event_x1_cb,
 376         .legacy_unsubscribe_event_x1 = xreq_legacy_unsubscribe_event_x1_cb,
 377         .legacy_subcall = xreq_legacy_subcall_cb,
 378         .legacy_subcallsync = xreq_legacy_subcallsync_cb,
 379         .vverbose = xreq_vverbose_cb,
 380         .legacy_store_req = xreq_legacy_store_cb,
 381         .legacy_subcall_req = xreq_legacy_subcall_req_cb,
 382         .has_permission = xreq_has_permission_cb,
 383         .get_application_id = xreq_get_application_id_cb,
 384         .context_make = xreq_context_make_cb,
 385         .subscribe_event_x2 = xreq_subscribe_event_x2_cb,
 386         .unsubscribe_event_x2 = xreq_unsubscribe_event_x2_cb,
 387         .legacy_subcall_request = xreq_legacy_subcall_request_cb,
 388         .get_uid = xreq_get_uid_cb,
 389         .reply = xreq_reply_cb,
 390         .vreply = xreq_vreply_cb,
 391         .get_client_info = xreq_get_client_info_cb,
 392         .subcall = xreq_subcall_cb,
 393         .subcallsync = xreq_subcallsync_cb,
 394 };
 395 /******************************************************************************/
 396 #if WITH_AFB_HOOK
 397
 398 static struct json_object *xreq_hooked_json_cb(struct afb_req_x2 *closure)
 399 {
 400         struct json_object *r = xreq_json_cb(closure);
 401         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 402         return afb_hook_xreq_json(xreq, r);
 403 }
 404
 405 static struct afb_arg xreq_hooked_get_cb(struct afb_req_x2 *closure, const char *name)
 406 {
 407         struct afb_arg r = xreq_get_cb(closure, name);
 408         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 409         return afb_hook_xreq_get(xreq, name, r);
 410 }
 411
 412 static void xreq_hooked_reply_cb(struct afb_req_x2 *closure, struct json_object *obj, const char *error, const char *info)
 413 {
 414         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 415         afb_hook_xreq_reply(xreq, obj, error, info);
 416         xreq_reply_cb(closure, obj, error, info);
 417 }
 418
 419 static void xreq_hooked_vreply_cb(struct afb_req_x2 *closure, struct json_object *obj, const char *error, const char *fmt, va_list args)
 420 {
 421         char *info;
 422         if (fmt == NULL || vasprintf(&info, fmt, args) < 0)
 423                 info = NULL;
 424         xreq_hooked_reply_cb(closure, obj, error, info);
 425         free(info);
 426 }
 427
 428 static void xreq_hooked_legacy_success_cb(struct afb_req_x2 *closure, struct json_object *obj, const char *info)
 429 {
 430         xreq_hooked_reply_cb(closure, obj, NULL, info);
 431 }
 432
 433 static void xreq_hooked_legacy_fail_cb(struct afb_req_x2 *closure, const char *status, const char *info)
 434 {
 435         xreq_hooked_reply_cb(closure, NULL, status, info);
 436 }
 437
 438 static void xreq_hooked_legacy_vsuccess_cb(struct afb_req_x2 *closure, struct json_object *obj, const char *fmt, va_list args)
 439 {
 440         xreq_hooked_vreply_cb(closure, obj, NULL, fmt, args);
 441 }
 442
 443 static void xreq_hooked_legacy_vfail_cb(struct afb_req_x2 *closure, const char *status, const char *fmt, va_list args)
 444 {
 445         xreq_hooked_vreply_cb(closure, NULL, status, fmt, args);
 446 }
 447
 448 static void *xreq_hooked_legacy_context_get_cb(struct afb_req_x2 *closure)
 449 {
 450         void *r = xreq_legacy_context_get_cb(closure);
 451         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 452         return afb_hook_xreq_legacy_context_get(xreq, r);
 453 }
 454
 455 static void xreq_hooked_legacy_context_set_cb(struct afb_req_x2 *closure, void *value, void (*free_value)(void*))
 456 {
 457         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 458         afb_hook_xreq_legacy_context_set(xreq, value, free_value);
 459         xreq_legacy_context_set_cb(closure, value, free_value);
 460 }
 461
 462 static struct afb_req_x2 *xreq_hooked_addref_cb(struct afb_req_x2 *closure)
 463 {
 464         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 465         afb_hook_xreq_addref(xreq);
 466         return xreq_addref_cb(closure);
 467 }
 468
 469 static void xreq_hooked_unref_cb(struct afb_req_x2 *closure)
 470 {
 471         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 472         afb_hook_xreq_unref(xreq);
 473         xreq_unref_cb(closure);
 474 }
 475
 476 static void xreq_hooked_session_close_cb(struct afb_req_x2 *closure)
 477 {
 478         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 479         afb_hook_xreq_session_close(xreq);
 480         xreq_session_close_cb(closure);
 481 }
 482
 483 static int xreq_hooked_session_set_LOA_cb(struct afb_req_x2 *closure, unsigned level)
 484 {
 485         int r = xreq_session_set_LOA_cb(closure, level);
 486         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 487         return afb_hook_xreq_session_set_LOA(xreq, level, r);
 488 }
 489
 490 static int xreq_hooked_subscribe_event_x2_cb(struct afb_req_x2 *closure, struct afb_event_x2 *event)
 491 {
 492         int r = xreq_subscribe_event_x2_cb(closure, event);
 493         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 494         return afb_hook_xreq_subscribe(xreq, event, r);
 495 }
 496
 497 static int xreq_hooked_legacy_subscribe_event_x1_cb(struct afb_req_x2 *closure, struct afb_event_x1 event)
 498 {
 499         return xreq_hooked_subscribe_event_x2_cb(closure, afb_event_x1_to_event_x2(event));
 500 }
 501
 502 static int xreq_hooked_unsubscribe_event_x2_cb(struct afb_req_x2 *closure, struct afb_event_x2 *event)
 503 {
 504         int r = xreq_unsubscribe_event_x2_cb(closure, event);
 505         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 506         return afb_hook_xreq_unsubscribe(xreq, event, r);
 507 }
 508
 509 static int xreq_hooked_legacy_unsubscribe_event_x1_cb(struct afb_req_x2 *closure, struct afb_event_x1 event)
 510 {
 511         return xreq_hooked_unsubscribe_event_x2_cb(closure, afb_event_x1_to_event_x2(event));
 512 }
 513
 514 static void xreq_hooked_legacy_subcall_cb(struct afb_req_x2 *req, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *closure)
 515 {
 516         struct afb_xreq *xreq = xreq_from_req_x2(req);
 517         afb_calls_legacy_hooked_subcall_v1(xreq, api, verb, args, callback, closure);
 518 }
 519
 520 static void xreq_hooked_legacy_subcall_req_cb(struct afb_req_x2 *req, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*, struct afb_req_x1), void *closure)
 521 {
 522         struct afb_xreq *xreq = xreq_from_req_x2(req);
 523         afb_calls_legacy_hooked_subcall_v2(xreq, api, verb, args, callback, closure);
 524 }
 525
 526 static void xreq_hooked_legacy_subcall_request_cb(struct afb_req_x2 *req, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*, struct afb_req_x2 *), void *closure)
 527 {
 528         struct afb_xreq *xreq = xreq_from_req_x2(req);
 529         afb_calls_legacy_hooked_subcall_v3(xreq, api, verb, args, callback, closure);
 530 }
 531
 532 static int xreq_hooked_legacy_subcallsync_cb(struct afb_req_x2 *req, const char *api, const char *verb, struct json_object *args, struct json_object **result)
 533 {
 534         struct afb_xreq *xreq = xreq_from_req_x2(req);
 535         return afb_calls_legacy_hooked_subcall_sync(xreq, api, verb, args, result);
 536 }
 537
 538 static void xreq_hooked_vverbose_cb(struct afb_req_x2 *closure, int level, const char *file, int line, const char *func, const char *fmt, va_list args)
 539 {
 540         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 541         va_list ap;
 542         va_copy(ap, args);
 543         xreq_vverbose_cb(closure, level, file, line, func, fmt, args);
 544         afb_hook_xreq_vverbose(xreq, level, file, line, func, fmt, ap);
 545         va_end(ap);
 546 }
 547
 548 static struct afb_stored_req *xreq_hooked_legacy_store_cb(struct afb_req_x2 *closure)
 549 {
 550         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 551         struct afb_stored_req *r = xreq_legacy_store_cb(closure);
 552         afb_hook_xreq_legacy_store(xreq, r);
 553         return r;
 554 }
 555
 556 static int xreq_hooked_has_permission_cb(struct afb_req_x2 *closure, const char *permission)
 557 {
 558         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 559         int r = xreq_has_permission_cb(closure, permission);
 560         return afb_hook_xreq_has_permission(xreq, permission, r);
 561 }
 562
 563 static char *xreq_hooked_get_application_id_cb(struct afb_req_x2 *closure)
 564 {
 565         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 566         char *r = xreq_get_application_id_cb(closure);
 567         return afb_hook_xreq_get_application_id(xreq, r);
 568 }
 569
 570 static void *xreq_hooked_context_make_cb(struct afb_req_x2 *closure, int replace, void *(*create_value)(void*), void (*free_value)(void*), void *create_closure)
 571 {
 572         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 573         void *result = xreq_context_make_cb(closure, replace, create_value, free_value, create_closure);
 574         return afb_hook_xreq_context_make(xreq, replace, create_value, free_value, create_closure, result);
 575 }
 576
 577 static int xreq_hooked_get_uid_cb(struct afb_req_x2 *closure)
 578 {
 579         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 580         int r = xreq_get_uid_cb(closure);
 581         return afb_hook_xreq_get_uid(xreq, r);
 582 }
 583
 584 static struct json_object *xreq_hooked_get_client_info_cb(struct afb_req_x2 *closure)
 585 {
 586         struct afb_xreq *xreq = xreq_from_req_x2(closure);
 587         struct json_object *r = xreq_get_client_info_cb(closure);
 588         return afb_hook_xreq_get_client_info(xreq, r);
 589 }
 590
 591 static void xreq_hooked_subcall_cb(
 592                                 struct afb_req_x2 *req,
 593                                 const char *api,
 594                                 const char *verb,
 595                                 struct json_object *args,
 596                                 int flags,
 597                                 void (*callback)(void *closure, struct json_object *object, const char *error, const char * info, struct afb_req_x2 *req),
 598                                 void *closure)
 599 {
 600         struct afb_xreq *xreq = xreq_from_req_x2(req);
 601         afb_calls_hooked_subcall(xreq, api, verb, args, flags, callback, closure);
 602 }
 603
 604 static int xreq_hooked_subcallsync_cb(
 605                                 struct afb_req_x2 *req,
 606                                 const char *api,
 607                                 const char *verb,
 608                                 struct json_object *args,
 609                                 int flags,
 610                                 struct json_object **object,
 611                                 char **error,
 612                                 char **info)
 613 {
 614         struct afb_xreq *xreq = xreq_from_req_x2(req);
 615         return afb_calls_hooked_subcall_sync(xreq, api, verb, args, flags, object, error, info);
 616 }
 617
 618 /******************************************************************************/
 619
 620 const struct afb_req_x2_itf xreq_hooked_itf = {
 621         .json = xreq_hooked_json_cb,
 622         .get = xreq_hooked_get_cb,
 623         .legacy_success = xreq_hooked_legacy_success_cb,
 624         .legacy_fail = xreq_hooked_legacy_fail_cb,
 625         .legacy_vsuccess = xreq_hooked_legacy_vsuccess_cb,
 626         .legacy_vfail = xreq_hooked_legacy_vfail_cb,
 627         .legacy_context_get = xreq_hooked_legacy_context_get_cb,
 628         .legacy_context_set = xreq_hooked_legacy_context_set_cb,
 629         .addref = xreq_hooked_addref_cb,
 630         .unref = xreq_hooked_unref_cb,
 631         .session_close = xreq_hooked_session_close_cb,
 632         .session_set_LOA = xreq_hooked_session_set_LOA_cb,
 633         .legacy_subscribe_event_x1 = xreq_hooked_legacy_subscribe_event_x1_cb,
 634         .legacy_unsubscribe_event_x1 = xreq_hooked_legacy_unsubscribe_event_x1_cb,
 635         .legacy_subcall = xreq_hooked_legacy_subcall_cb,
 636         .legacy_subcallsync = xreq_hooked_legacy_subcallsync_cb,
 637         .vverbose = xreq_hooked_vverbose_cb,
 638         .legacy_store_req = xreq_hooked_legacy_store_cb,
 639         .legacy_subcall_req = xreq_hooked_legacy_subcall_req_cb,
 640         .has_permission = xreq_hooked_has_permission_cb,
 641         .get_application_id = xreq_hooked_get_application_id_cb,
 642         .context_make = xreq_hooked_context_make_cb,
 643         .subscribe_event_x2 = xreq_hooked_subscribe_event_x2_cb,
 644         .unsubscribe_event_x2 = xreq_hooked_unsubscribe_event_x2_cb,
 645         .legacy_subcall_request = xreq_hooked_legacy_subcall_request_cb,
 646         .get_uid = xreq_hooked_get_uid_cb,
 647         .reply = xreq_hooked_reply_cb,
 648         .vreply = xreq_hooked_vreply_cb,
 649         .get_client_info = xreq_hooked_get_client_info_cb,
 650         .subcall = xreq_hooked_subcall_cb,
 651         .subcallsync = xreq_hooked_subcallsync_cb,
 652 };
 653 #endif
 654
 655 /******************************************************************************/
 656
 657 struct afb_req_x1 afb_xreq_unstore(struct afb_stored_req *sreq)
 658 {
 659         struct afb_xreq *xreq = (struct afb_xreq *)sreq;
 660 #if WITH_AFB_HOOK
 661         if (xreq->hookflags)
 662                 afb_hook_xreq_legacy_unstore(xreq);
 663 #endif
 664         return xreq_to_req_x1(xreq);
 665 }
 666
 667 struct json_object *afb_xreq_json(struct afb_xreq *xreq)
 668 {
 669         return afb_req_x2_json(xreq_to_req_x2(xreq));
 670 }
 671
 672 void afb_xreq_reply(struct afb_xreq *xreq, struct json_object *obj, const char *error, const char *info)
 673 {
 674         afb_req_x2_reply(xreq_to_req_x2(xreq), obj, error, info);
 675 }
 676
 677 void afb_xreq_reply_f(struct afb_xreq *xreq, struct json_object *obj, const char *error, const char *info, ...)
 678 {
 679         va_list args;
 680
 681         va_start(args, info);
 682         afb_req_x2_reply_v(xreq_to_req_x2(xreq), obj, error, info, args);
 683         va_end(args);
 684 }
 685
 686 const char *afb_xreq_raw(struct afb_xreq *xreq, size_t *size)
 687 {
 688         struct json_object *obj = xreq_json_cb(xreq_to_req_x2(xreq));
 689         const char *result = json_object_to_json_string_ext(obj, JSON_C_TO_STRING_NOSLASHESCAPE);
 690         if (size != NULL)
 691                 *size = strlen(result);
 692         return result;
 693 }
 694
 695 void afb_xreq_unhooked_legacy_subcall(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*, struct afb_req_x2 *), void *cb_closure)
 696 {
 697         xreq_legacy_subcall_request_cb(xreq_to_req_x2(xreq), api, verb, args, callback, cb_closure);
 698 }
 699
 700 void afb_xreq_unhooked_subcall(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, int flags, void (*callback)(void*, struct json_object*, const char*, const char*, struct afb_req_x2 *), void *closure)
 701 {
 702         xreq_subcall_cb(xreq_to_req_x2(xreq), api, verb, args, flags, callback, closure);
 703 }
 704
 705 int afb_xreq_unhooked_legacy_subcall_sync(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, struct json_object **result)
 706 {
 707         return xreq_legacy_subcallsync_cb(xreq_to_req_x2(xreq), api, verb, args, result);
 708 }
 709
 710 void afb_xreq_addref(struct afb_xreq *xreq)
 711 {
 712         afb_req_x2_addref(xreq_to_req_x2(xreq));
 713 }
 714
 715 void afb_xreq_unref(struct afb_xreq *xreq)
 716 {
 717         afb_req_x2_unref(xreq_to_req_x2(xreq));
 718 }
 719
 720 void afb_xreq_legacy_subcall(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*, struct afb_req_x2 *), void *cb_closure)
 721 {
 722         afb_req_x2_subcall_legacy(xreq_to_req_x2(xreq), api, verb, args, callback, cb_closure);
 723 }
 724
 725 void afb_xreq_subcall(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, int flags, void (*callback)(void*, struct json_object*, const char*, const char*, struct afb_req_x2 *), void *closure)
 726 {
 727         afb_req_x2_subcall(xreq_to_req_x2(xreq), api, verb, args, flags, callback, closure);
 728 }
 729
 730 int afb_xreq_legacy_subcall_sync(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, struct json_object **result)
 731 {
 732         return afb_req_x2_subcall_sync_legacy(xreq_to_req_x2(xreq), api, verb, args, result);
 733 }
 734
 735 #if WITH_LEGACY_BINDING_V1
 736 static int xreq_session_check_apply_v1(struct afb_xreq *xreq, int sessionflags)
 737 {
 738         int loa;
 739
 740         if ((sessionflags & (AFB_SESSION_CLOSE_X1|AFB_SESSION_RENEW_X1|AFB_SESSION_CHECK_X1|AFB_SESSION_LOA_EQ_X1)) != 0) {
 741                 if (!afb_context_check(&xreq->context)) {
 742                         afb_context_close(&xreq->context);
 743                         afb_xreq_reply_f(xreq, NULL, "denied", "invalid token's identity");
 744                         errno = EINVAL;
 745                         return -1;
 746                 }
 747         }
 748
 749         if ((sessionflags & AFB_SESSION_LOA_GE_X1) != 0) {
 750                 loa = (sessionflags >> AFB_SESSION_LOA_SHIFT_X1) & AFB_SESSION_LOA_MASK_X1;
 751                 if (!afb_context_check_loa(&xreq->context, loa)) {
 752                         afb_xreq_reply_f(xreq, NULL, "denied", "invalid LOA");
 753                         errno = EPERM;
 754                         return -1;
 755                 }
 756         }
 757
 758         if ((sessionflags & AFB_SESSION_LOA_LE_X1) != 0) {
 759                 loa = (sessionflags >> AFB_SESSION_LOA_SHIFT_X1) & AFB_SESSION_LOA_MASK_X1;
 760                 if (afb_context_check_loa(&xreq->context, loa + 1)) {
 761                         afb_xreq_reply_f(xreq, NULL, "denied", "invalid LOA");
 762                         errno = EPERM;
 763                         return -1;
 764                 }
 765         }
 766
 767         if ((sessionflags & AFB_SESSION_RENEW_X1) != 0) {
 768                 afb_context_refresh(&xreq->context);
 769         }
 770         if ((sessionflags & AFB_SESSION_CLOSE_X1) != 0) {
 771                 afb_context_change_loa(&xreq->context, 0);
 772                 afb_context_close(&xreq->context);
 773         }
 774
 775         return 0;
 776 }
 777 #endif
 778
 779 static int xreq_session_check_apply_v2(struct afb_xreq *xreq, uint32_t sessionflags, const struct afb_auth *auth)
 780 {
 781         int loa;
 782
 783         if (sessionflags != 0) {
 784                 if (!afb_context_check(&xreq->context)) {
 785                         afb_context_close(&xreq->context);
 786                         afb_xreq_reply_f(xreq, NULL, "denied", "invalid token's identity");
 787                         errno = EINVAL;
 788                         return -1;
 789                 }
 790         }
 791
 792         loa = (int)(sessionflags & AFB_SESSION_LOA_MASK_X2);
 793         if (loa && !afb_context_check_loa(&xreq->context, loa)) {
 794                 afb_xreq_reply_f(xreq, NULL, "denied", "invalid LOA");
 795                 errno = EPERM;
 796                 return -1;
 797         }
 798
 799         if (auth && !afb_auth_check(xreq, auth)) {
 800                 afb_xreq_reply_f(xreq, NULL, "denied", "authorisation refused");
 801                 errno = EPERM;
 802                 return -1;
 803         }
 804
 805         if ((sessionflags & AFB_SESSION_REFRESH_X2) != 0) {
 806                 afb_context_refresh(&xreq->context);
 807         }
 808         if ((sessionflags & AFB_SESSION_CLOSE_X2) != 0) {
 809                 afb_context_close(&xreq->context);
 810         }
 811
 812         return 0;
 813 }
 814
 815 #if WITH_LEGACY_BINDING_V1
 816 void afb_xreq_call_verb_v1(struct afb_xreq *xreq, const struct afb_verb_desc_v1 *verb)
 817 {
 818         if (!verb)
 819                 afb_xreq_reply_unknown_verb(xreq);
 820         else
 821                 if (!xreq_session_check_apply_v1(xreq, verb->session))
 822                         verb->callback(xreq_to_req_x1(xreq));
 823 }
 824 #endif
 825
 826 #if WITH_LEGACY_BINDING_V2
 827 void afb_xreq_call_verb_v2(struct afb_xreq *xreq, const struct afb_verb_v2 *verb)
 828 {
 829         if (!verb)
 830                 afb_xreq_reply_unknown_verb(xreq);
 831         else
 832                 if (!xreq_session_check_apply_v2(xreq, verb->session, verb->auth))
 833                         verb->callback(xreq_to_req_x1(xreq));
 834 }
 835 #endif
 836
 837 void afb_xreq_call_verb_v3(struct afb_xreq *xreq, const struct afb_verb_v3 *verb)
 838 {
 839         if (!verb)
 840                 afb_xreq_reply_unknown_verb(xreq);
 841         else
 842                 if (xreq_session_check_apply_v2(xreq, verb->session, verb->auth) >= 0)
 843                         verb->callback(xreq_to_req_x2(xreq));
 844 }
 845
 846 void afb_xreq_init(struct afb_xreq *xreq, const struct afb_xreq_query_itf *queryitf)
 847 {
 848         memset(xreq, 0, sizeof *xreq);
 849         xreq->request.itf = &xreq_itf; /* no hook by default */
 850         xreq->refcount = 1;
 851         xreq->queryitf = queryitf;
 852 }
 853
 854 void afb_xreq_reply_unknown_api(struct afb_xreq *xreq)
 855 {
 856         afb_xreq_reply_f(xreq, NULL, "unknown-api", "api %s not found (for verb %s)", xreq->request.called_api, xreq->request.called_verb);
 857 }
 858
 859 void afb_xreq_reply_unknown_verb(struct afb_xreq *xreq)
 860 {
 861         afb_xreq_reply_f(xreq, NULL, "unknown-verb", "verb %s unknown within api %s", xreq->request.called_verb, xreq->request.called_api);
 862 }
 863
 864 #if WITH_AFB_HOOK
 865 static void init_hooking(struct afb_xreq *xreq)
 866 {
 867         afb_hook_init_xreq(xreq);
 868         if (xreq->hookflags) {
 869                 xreq->request.itf = &xreq_hooked_itf; /* unhook the interface */
 870                 afb_hook_xreq_begin(xreq);
 871         }
 872 }
 873 #endif
 874
 875 /**
 876  * job callback for asynchronous and secured processing of the request.
 877  */
 878 static void process_async(int signum, void *arg)
 879 {
 880         struct afb_xreq *xreq = arg;
 881         const struct afb_api_item *api;
 882
 883         if (signum != 0) {
 884                 /* emit the error (assumes that hooking is initialised) */
 885                 afb_xreq_reply_f(xreq, NULL, "aborted", "signal %s(%d) caught", strsignal(signum), signum);
 886         } else {
 887 #if WITH_AFB_HOOK
 888                 /* init hooking */
 889                 init_hooking(xreq);
 890 #endif
 891                 /* invoke api call method to process the request */
 892                 api = (const struct afb_api_item*)xreq->context.api_key;
 893                 api->itf->call(api->closure, xreq);
 894         }
 895         /* release the request */
 896         afb_xreq_unhooked_unref(xreq);
 897 }
 898
 899 /**
 900  * Early request failure of the request 'xreq' with, as usual, 'status' and 'info'
 901  * The early failure occurs only in function 'afb_xreq_process' where normally,
 902  * the hooking is not initialised. So this "early" failure takes care to initialise
 903  * the hooking in first.
 904  */
 905 static void early_failure(struct afb_xreq *xreq, const char *status, const char *info, ...)
 906 {
 907         va_list args;
 908
 909 #if WITH_AFB_HOOK
 910         /* init hooking */
 911         init_hooking(xreq);
 912 #endif
 913
 914         /* send error */
 915         va_start(args, info);
 916         afb_req_x2_reply_v(xreq_to_req_x2(xreq), NULL, status, info, args);
 917         va_end(args);
 918 }
 919
 920 /**
 921  * Enqueue a job for processing the request 'xreq' using the given 'apiset'.
 922  * Errors are reported as request failures.
 923  */
 924 void afb_xreq_process(struct afb_xreq *xreq, struct afb_apiset *apiset)
 925 {
 926         const struct afb_api_item *api;
 927         struct afb_xreq *caller;
 928
 929         /* lookup at the api */
 930         xreq->apiset = apiset;
 931         api = afb_apiset_lookup_started(apiset, xreq->request.called_api, 1);
 932         if (!api) {
 933                 if (errno == ENOENT)
 934                         early_failure(xreq, "unknown-api", "api %s not found (for verb %s)", xreq->request.called_api, xreq->request.called_verb);
 935                 else
 936                         early_failure(xreq, "bad-api-state", "api %s not started correctly: %m", xreq->request.called_api);
 937                 goto end;
 938         }
 939         xreq->context.api_key = api;
 940
 941         /* check self locking */
 942         if (api->group) {
 943                 caller = xreq->caller;
 944                 while (caller) {
 945                         if (((const struct afb_api_item*)caller->context.api_key)->group == api->group) {
 946                                 /* noconcurrency lock detected */
 947                                 ERROR("self-lock detected in call stack for API %s", xreq->request.called_api);
 948                                 early_failure(xreq, "self-locked", "recursive self lock, API %s", xreq->request.called_api);
 949                                 goto end;
 950                         }
 951                         caller = caller->caller;
 952                 }
 953         }
 954
 955         /* queue the request job */
 956         afb_xreq_unhooked_addref(xreq);
 957         if (jobs_queue(api->group, afb_apiset_timeout_get(apiset), process_async, xreq) < 0) {
 958                 /* TODO: allows or not to proccess it directly as when no threading? (see above) */
 959                 ERROR("can't process job with threads: %m");
 960                 early_failure(xreq, "cancelled", "not able to create a job for the task");
 961                 afb_xreq_unhooked_unref(xreq);
 962         }
 963 end:
 964         afb_xreq_unhooked_unref(xreq);
 965 }
 966
 967 const char *xreq_on_behalf_cred_export(struct afb_xreq *xreq)
 968 {
 969         return xreq->caller ? afb_cred_export(xreq->cred) : NULL;
 970 }
 971