src/afb-trace.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 <assert.h>
  21 #include <string.h>
  22 #include <stdarg.h>
  23 #include <errno.h>
  24 #include <stdio.h>
  25 #include <limits.h>
  26 #include <unistd.h>
  27 #include <pthread.h>
  28
  29 #include <json-c/json.h>
  30 #include <afb/afb-binding-v2.h>
  31
  32 #include "afb-hook.h"
  33 #include "afb-cred.h"
  34 #include "afb-session.h"
  35 #include "afb-xreq.h"
  36 #include "afb-export.h"
  37 #include "afb-evt.h"
  38 #include "afb-trace.h"
  39
  40 #include "wrap-json.h"
  41 #include "verbose.h"
  42
  43 /*******************************************************************************/
  44 /*****  default names                                                      *****/
  45 /*******************************************************************************/
  46
  47 #if !defined(DEFAULT_EVENT_NAME)
  48 #  define DEFAULT_EVENT_NAME "trace"
  49 #endif
  50 #if !defined(DEFAULT_TAG_NAME)
  51 #  define DEFAULT_TAG_NAME "trace"
  52 #endif
  53
  54 /*******************************************************************************/
  55 /*****  types                                                              *****/
  56 /*******************************************************************************/
  57
  58 /* structure for searching flags by names */
  59 struct flag
  60 {
  61         const char *name;       /** the name */
  62         int value;              /** the value */
  63 };
  64
  65 /* struct for tags */
  66 struct tag {
  67         struct tag *next;       /* link to the next */
  68         char tag[1];            /* name of the tag */
  69 };
  70
  71 /* struct for events */
  72 struct event {
  73         struct event *next;             /* link to the next event */
  74         struct afb_event event;         /* the event */
  75 };
  76
  77 /* struct for sessions */
  78 struct session {
  79         struct session *next;           /* link to the next session */
  80         struct afb_session *session;    /* the session */
  81         struct afb_trace *trace;        /* the tracer */
  82 };
  83
  84 /* struct for recording hooks */
  85 struct hook {
  86         struct hook *next;              /* link to next hook */
  87         void *handler;                  /* the handler of the hook */
  88         struct event *event;            /* the associated event */
  89         struct tag *tag;                /* the associated tag */
  90         struct session *session;        /* the associated session */
  91 };
  92
  93 /* types of hooks */
  94 enum trace_type
  95 {
  96         Trace_Type_Xreq,        /* xreq hooks */
  97         Trace_Type_Ditf,        /* export hooks */
  98         Trace_Type_Svc,         /* export hooks */
  99         Trace_Type_Evt,         /* evt hooks */
 100         Trace_Type_Global,      /* global hooks */
 101         Trace_Type_Count        /* count of types of hooks */
 102 };
 103
 104 /* client data */
 105 struct afb_trace
 106 {
 107         int refcount;                           /* reference count */
 108         pthread_mutex_t mutex;                  /* concurrency management */
 109         struct afb_daemon *daemon;              /* daemon */
 110         struct afb_session *bound;              /* bound to session */
 111         struct event *events;                   /* list of events */
 112         struct tag *tags;                       /* list of tags */
 113         struct session *sessions;               /* list of tags */
 114         struct hook *hooks[Trace_Type_Count];   /* hooks */
 115 };
 116
 117 /*******************************************************************************/
 118 /*****  utility functions                                                  *****/
 119 /*******************************************************************************/
 120
 121 static void ctxt_error(char **errors, const char *format, ...)
 122 {
 123         int len;
 124         char *errs;
 125         size_t sz;
 126         char buffer[1024];
 127         va_list ap;
 128
 129         va_start(ap, format);
 130         len = vsnprintf(buffer, sizeof buffer, format, ap);
 131         va_end(ap);
 132         if (len > (int)(sizeof buffer - 2))
 133                 len = (int)(sizeof buffer - 2);
 134         buffer[len++] = '\n';
 135         buffer[len++] = 0;
 136
 137         errs = *errors;
 138         sz = errs ? strlen(errs) : 0;
 139         errs = realloc(errs, sz + (size_t)len);
 140         if (errs) {
 141                 memcpy(errs + sz, buffer, len);
 142                 *errors = errs;
 143         }
 144 }
 145
 146 /* get the value of the flag of 'name' in the array 'flags' of 'count elements */
 147 static int get_flag(const char *name, struct flag flags[], int count)
 148 {
 149         /* dichotomic search */
 150         int lower = 0, upper = count;
 151         while (lower < upper) {
 152                 int mid = (lower + upper) >> 1;
 153                 int cmp = strcmp(name, flags[mid].name);
 154                 if (!cmp)
 155                         return flags[mid].value;
 156                 if (cmp < 0)
 157                         upper = mid;
 158                 else
 159                         lower = mid + 1;
 160         }
 161         return 0;
 162 }
 163
 164 /* timestamp */
 165 static struct json_object *timestamp(const struct afb_hookid *hookid)
 166 {
 167         char ts[50];
 168
 169         snprintf(ts, sizeof ts, "%llu.%06lu", (long long unsigned)hookid->time.tv_sec, (long unsigned)(hookid->time.tv_nsec / 1000));
 170         return json_object_new_string(ts);
 171 }
 172
 173 /* verbosity level name or NULL */
 174 static const char *verbosity_level_name(int level)
 175 {
 176         static const char *names[] = {
 177                 "error",
 178                 "warning",
 179                 "notice",
 180                 "info",
 181                 "debug"
 182         };
 183
 184         return level >= Log_Level_Error && level <= Log_Level_Debug ? names[level - Log_Level_Error] : NULL;
 185 }
 186
 187 /* generic hook */
 188 static void emit(void *closure, const struct afb_hookid *hookid, const char *type, const char *fmt1, const char *fmt2, va_list ap2, ...)
 189 {
 190         struct hook *hook = closure;
 191         struct json_object *data, *data1, *data2;
 192         va_list ap1;
 193
 194         data1 = data2 = data = NULL;
 195         va_start(ap1, ap2);
 196         wrap_json_vpack(&data1, fmt1, ap1);
 197         va_end(ap1);
 198         if (fmt2)
 199                 wrap_json_vpack(&data2, fmt2, ap2);
 200
 201         wrap_json_pack(&data, "{so ss ss si so so*}",
 202                                         "time", timestamp(hookid),
 203                                         "tag", hook->tag->tag,
 204                                         "type", type,
 205                                         "id", (int)(hookid->id & INT_MAX),
 206                                         type, data1,
 207                                         "data", data2);
 208
 209         afb_evt_unhooked_push(hook->event->event, data);
 210 }
 211
 212 /*******************************************************************************/
 213 /*****  trace the requests                                                 *****/
 214 /*******************************************************************************/
 215
 216 static struct flag xreq_flags[] = { /* must be sorted by names */
 217                 { "addref",             afb_hook_flag_req_addref },
 218                 { "all",                afb_hook_flags_req_all },
 219                 { "args",               afb_hook_flags_req_args },
 220                 { "begin",              afb_hook_flag_req_begin },
 221                 { "common",             afb_hook_flags_req_common },
 222                 { "context",            afb_hook_flags_req_context },
 223                 { "context_get",        afb_hook_flag_req_context_get },
 224                 { "context_make",       afb_hook_flag_req_context_make },
 225                 { "context_set",        afb_hook_flag_req_context_set },
 226                 { "end",                afb_hook_flag_req_end },
 227                 { "event",              afb_hook_flags_req_event },
 228                 { "extra",              afb_hook_flags_req_extra },
 229                 { "fail",               afb_hook_flag_req_fail },
 230                 { "get",                afb_hook_flag_req_get },
 231                 { "get_application_id", afb_hook_flag_req_get_application_id },
 232                 { "has_permission",     afb_hook_flag_req_has_permission },
 233                 { "json",               afb_hook_flag_req_json },
 234                 { "life",               afb_hook_flags_req_life },
 235                 { "ref",                afb_hook_flags_req_ref },
 236                 { "result",             afb_hook_flags_req_result },
 237                 { "security",           afb_hook_flags_req_security },
 238                 { "session",            afb_hook_flags_req_session },
 239                 { "session_close",      afb_hook_flag_req_session_close },
 240                 { "session_set_LOA",    afb_hook_flag_req_session_set_LOA },
 241                 { "store",              afb_hook_flag_req_store },
 242                 { "stores",             afb_hook_flags_req_stores },
 243                 { "subcall",            afb_hook_flag_req_subcall },
 244                 { "subcall_req",        afb_hook_flag_req_subcall_req },
 245                 { "subcall_req_result", afb_hook_flag_req_subcall_req_result },
 246                 { "subcall_result",     afb_hook_flag_req_subcall_result },
 247                 { "subcalls",           afb_hook_flags_req_subcalls },
 248                 { "subcallsync",        afb_hook_flag_req_subcallsync },
 249                 { "subcallsync_result", afb_hook_flag_req_subcallsync_result },
 250                 { "subscribe",          afb_hook_flag_req_subscribe },
 251                 { "success",            afb_hook_flag_req_success },
 252                 { "unref",              afb_hook_flag_req_unref },
 253                 { "unstore",            afb_hook_flag_req_unstore },
 254                 { "unsubscribe",        afb_hook_flag_req_unsubscribe },
 255                 { "vverbose",           afb_hook_flag_req_vverbose },
 256 };
 257
 258 /* get the xreq value for flag of 'name' */
 259 static int get_xreq_flag(const char *name)
 260 {
 261         return get_flag(name, xreq_flags, (int)(sizeof xreq_flags / sizeof *xreq_flags));
 262 }
 263
 264 static void hook_xreq(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *action, const char *format, ...)
 265 {
 266         struct json_object *cred = NULL;
 267         const char *session = NULL;
 268         va_list ap;
 269
 270         if (xreq->context.session)
 271                 session = afb_session_uuid(xreq->context.session);
 272
 273         if (xreq->cred)
 274                 wrap_json_pack(&cred, "{si ss si si ss* ss*}",
 275                                                 "uid", (int)xreq->cred->uid,
 276                                                 "user", xreq->cred->user,
 277                                                 "gid", (int)xreq->cred->gid,
 278                                                 "pid", (int)xreq->cred->pid,
 279                                                 "label", xreq->cred->label,
 280                                                 "id", xreq->cred->id
 281                                         );
 282         va_start(ap, format);
 283         emit(closure, hookid, "request", "{si ss ss ss so* ss*}", format, ap,
 284                                         "index", xreq->hookindex,
 285                                         "api", xreq->api,
 286                                         "verb", xreq->verb,
 287                                         "action", action,
 288                                         "credentials", cred,
 289                                         "session", session);
 290         va_end(ap);
 291 }
 292
 293 static void hook_xreq_begin(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq)
 294 {
 295         hook_xreq(closure, hookid, xreq, "begin", NULL);
 296 }
 297
 298 static void hook_xreq_end(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq)
 299 {
 300         hook_xreq(closure, hookid, xreq, "end", NULL);
 301 }
 302
 303 static void hook_xreq_json(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct json_object *obj)
 304 {
 305         hook_xreq(closure, hookid, xreq, "json", "{sO?}",
 306                                                 "result", obj);
 307 }
 308
 309 static void hook_xreq_get(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *name, struct afb_arg arg)
 310 {
 311         hook_xreq(closure, hookid, xreq, "get", "{ss? ss? ss? ss?}",
 312                                                 "query", name,
 313                                                 "name", arg.name,
 314                                                 "value", arg.value,
 315                                                 "path", arg.path);
 316 }
 317
 318 static void hook_xreq_success(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct json_object *obj, const char *info)
 319 {
 320         hook_xreq(closure, hookid, xreq, "success", "{sO? ss?}",
 321                                                 "result", obj,
 322                                                 "info", info);
 323 }
 324
 325 static void hook_xreq_fail(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *status, const char *info)
 326 {
 327         hook_xreq(closure, hookid, xreq, "fail", "{ss? ss?}",
 328                                                 "status", status,
 329                                                 "info", info);
 330 }
 331
 332 static void hook_xreq_context_get(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, void *value)
 333 {
 334         hook_xreq(closure, hookid, xreq, "context_get", NULL);
 335 }
 336
 337 static void hook_xreq_context_set(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, void *value, void (*free_value)(void*))
 338 {
 339         hook_xreq(closure, hookid, xreq, "context_set", NULL);
 340 }
 341
 342 static void hook_xreq_addref(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq)
 343 {
 344         hook_xreq(closure, hookid, xreq, "addref", NULL);
 345 }
 346
 347 static void hook_xreq_unref(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq)
 348 {
 349         hook_xreq(closure, hookid, xreq, "unref", NULL);
 350 }
 351
 352 static void hook_xreq_session_close(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq)
 353 {
 354         hook_xreq(closure, hookid, xreq, "session_close", NULL);
 355 }
 356
 357 static void hook_xreq_session_set_LOA(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, unsigned level, int result)
 358 {
 359         hook_xreq(closure, hookid, xreq, "session_set_LOA", "{si si}",
 360                                         "level", level,
 361                                         "result", result);
 362 }
 363
 364 static void hook_xreq_subscribe(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct afb_event event, int result)
 365 {
 366         hook_xreq(closure, hookid, xreq, "subscribe", "{s{ss si} si}",
 367                                         "event",
 368                                                 "name", afb_evt_event_name(event),
 369                                                 "id", afb_evt_event_id(event),
 370                                         "result", result);
 371 }
 372
 373 static void hook_xreq_unsubscribe(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct afb_event event, int result)
 374 {
 375         hook_xreq(closure, hookid, xreq, "unsubscribe", "{s{ss? si} si}",
 376                                         "event",
 377                                                 "name", afb_evt_event_name(event),
 378                                                 "id", afb_evt_event_id(event),
 379                                         "result", result);
 380 }
 381
 382 static void hook_xreq_subcall(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args)
 383 {
 384         hook_xreq(closure, hookid, xreq, "subcall", "{ss? ss? sO?}",
 385                                         "api", api,
 386                                         "verb", verb,
 387                                         "args", args);
 388 }
 389
 390 static void hook_xreq_subcall_result(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, int status, struct json_object *result)
 391 {
 392         hook_xreq(closure, hookid, xreq, "subcall_result", "{si sO?}",
 393                                         "status", status,
 394                                         "result", result);
 395 }
 396
 397 static void hook_xreq_subcallsync(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args)
 398 {
 399         hook_xreq(closure, hookid, xreq, "subcallsync", "{ss? ss? sO?}",
 400                                         "api", api,
 401                                         "verb", verb,
 402                                         "args", args);
 403 }
 404
 405 static void hook_xreq_subcallsync_result(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, int status, struct json_object *result)
 406 {
 407         hook_xreq(closure, hookid, xreq, "subcallsync_result", "{si sO?}",
 408                                         "status", status,
 409                                         "result", result);
 410 }
 411
 412 static void hook_xreq_vverbose(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)
 413 {
 414         struct json_object *pos;
 415         int len;
 416         char *msg;
 417         va_list ap;
 418
 419         pos = NULL;
 420         msg = NULL;
 421
 422         va_copy(ap, args);
 423         len = vasprintf(&msg, fmt, ap);
 424         va_end(ap);
 425
 426         if (file)
 427                 wrap_json_pack(&pos, "{ss si ss*}", "file", file, "line", line, "function", func);
 428
 429         hook_xreq(closure, hookid, xreq, "vverbose", "{si ss* ss? so*}",
 430                                         "level", level,
 431                                         "type", verbosity_level_name(level),
 432                                         len < 0 ? "format" : "message", len < 0 ? fmt : msg,
 433                                         "position", pos);
 434
 435         free(msg);
 436 }
 437
 438 static void hook_xreq_store(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct afb_stored_req *sreq)
 439 {
 440         hook_xreq(closure, hookid, xreq, "store", NULL);
 441 }
 442
 443 static void hook_xreq_unstore(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq)
 444 {
 445         hook_xreq(closure, hookid, xreq, "unstore", NULL);
 446 }
 447
 448 static void hook_xreq_subcall_req(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args)
 449 {
 450         hook_xreq(closure, hookid, xreq, "subcall_req", "{ss? ss? sO?}",
 451                                         "api", api,
 452                                         "verb", verb,
 453                                         "args", args);
 454 }
 455
 456 static void hook_xreq_subcall_req_result(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, int status, struct json_object *result)
 457 {
 458         hook_xreq(closure, hookid, xreq, "subcall_req_result", "{si sO?}",
 459                                         "status", status,
 460                                         "result", result);
 461 }
 462
 463 static void hook_xreq_has_permission(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *permission, int result)
 464 {
 465         hook_xreq(closure, hookid, xreq, "has_permission", "{ss sb}",
 466                                         "permission", permission,
 467                                         "result", result);
 468 }
 469
 470 static void hook_xreq_get_application_id(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, char *result)
 471 {
 472         hook_xreq(closure, hookid, xreq, "get_application_id", "{ss?}",
 473                                         "result", result);
 474 }
 475
 476 static void hook_xreq_context_make(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, int replace, void *(*create_value)(void*), void (*free_value)(void*), void *create_closure, void *result)
 477 {
 478         char pc[50], pf[50], pv[50], pr[50];
 479         snprintf(pc, sizeof pc, "%p", create_value);
 480         snprintf(pf, sizeof pf, "%p", free_value);
 481         snprintf(pv, sizeof pv, "%p", create_closure);
 482         snprintf(pr, sizeof pr, "%p", result);
 483         hook_xreq(closure, hookid, xreq, "context_make", "{sb ss ss ss ss}",
 484                                         "replace", replace,
 485                                         "create", pc,
 486                                         "free", pf,
 487                                         "closure", pv,
 488                                         "result", pr);
 489 }
 490
 491 static struct afb_hook_xreq_itf hook_xreq_itf = {
 492         .hook_xreq_begin = hook_xreq_begin,
 493         .hook_xreq_end = hook_xreq_end,
 494         .hook_xreq_json = hook_xreq_json,
 495         .hook_xreq_get = hook_xreq_get,
 496         .hook_xreq_success = hook_xreq_success,
 497         .hook_xreq_fail = hook_xreq_fail,
 498         .hook_xreq_context_get = hook_xreq_context_get,
 499         .hook_xreq_context_set = hook_xreq_context_set,
 500         .hook_xreq_addref = hook_xreq_addref,
 501         .hook_xreq_unref = hook_xreq_unref,
 502         .hook_xreq_session_close = hook_xreq_session_close,
 503         .hook_xreq_session_set_LOA = hook_xreq_session_set_LOA,
 504         .hook_xreq_subscribe = hook_xreq_subscribe,
 505         .hook_xreq_unsubscribe = hook_xreq_unsubscribe,
 506         .hook_xreq_subcall = hook_xreq_subcall,
 507         .hook_xreq_subcall_result = hook_xreq_subcall_result,
 508         .hook_xreq_subcallsync = hook_xreq_subcallsync,
 509         .hook_xreq_subcallsync_result = hook_xreq_subcallsync_result,
 510         .hook_xreq_vverbose = hook_xreq_vverbose,
 511         .hook_xreq_store = hook_xreq_store,
 512         .hook_xreq_unstore = hook_xreq_unstore,
 513         .hook_xreq_subcall_req = hook_xreq_subcall_req,
 514         .hook_xreq_subcall_req_result = hook_xreq_subcall_req_result,
 515         .hook_xreq_has_permission = hook_xreq_has_permission,
 516         .hook_xreq_get_application_id = hook_xreq_get_application_id,
 517         .hook_xreq_context_make = hook_xreq_context_make
 518 };
 519
 520 /*******************************************************************************/
 521 /*****  trace the daemon interface                                         *****/
 522 /*******************************************************************************/
 523
 524 static struct flag ditf_flags[] = { /* must be sorted by names */
 525                 { "all",                        afb_hook_flags_ditf_all },
 526                 { "common",                     afb_hook_flags_ditf_common },
 527                 { "event_broadcast_after",      afb_hook_flag_ditf_event_broadcast_after },
 528                 { "event_broadcast_before",     afb_hook_flag_ditf_event_broadcast_before },
 529                 { "event_make",                 afb_hook_flag_ditf_event_make },
 530                 { "extra",                      afb_hook_flags_ditf_extra },
 531                 { "get_event_loop",             afb_hook_flag_ditf_get_event_loop },
 532                 { "get_system_bus",             afb_hook_flag_ditf_get_system_bus },
 533                 { "get_user_bus",               afb_hook_flag_ditf_get_user_bus },
 534                 { "queue_job",                  afb_hook_flag_ditf_queue_job },
 535                 { "require_api",                afb_hook_flag_ditf_require_api },
 536                 { "require_api_result",         afb_hook_flag_ditf_require_api_result },
 537                 { "rootdir_get_fd",             afb_hook_flag_ditf_rootdir_get_fd },
 538                 { "rootdir_open_locale",        afb_hook_flag_ditf_rootdir_open_locale },
 539                 { "unstore_req",                afb_hook_flag_ditf_unstore_req },
 540                 { "vverbose",                   afb_hook_flag_ditf_vverbose },
 541 };
 542
 543 /* get the export value for flag of 'name' */
 544 static int get_ditf_flag(const char *name)
 545 {
 546         return get_flag(name, ditf_flags, (int)(sizeof ditf_flags / sizeof *ditf_flags));
 547 }
 548
 549
 550 static void hook_ditf(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *action, const char *format, ...)
 551 {
 552         va_list ap;
 553
 554         va_start(ap, format);
 555         emit(closure, hookid, "daemon", "{ss ss}", format, ap,
 556                                         "api", afb_export_apiname(export),
 557                                         "action", action);
 558         va_end(ap);
 559 }
 560
 561 static void hook_ditf_event_broadcast_before(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *name, struct json_object *object)
 562 {
 563         hook_ditf(closure, hookid, export, "event_broadcast_before", "{ss sO*}",
 564                         "name", name, "data", object);
 565 }
 566
 567 static void hook_ditf_event_broadcast_after(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *name, struct json_object *object, int result)
 568 {
 569         hook_ditf(closure, hookid, export, "event_broadcast_after", "{ss sO* si}",
 570                         "name", name, "data", object, "result", result);
 571 }
 572
 573 static void hook_ditf_get_event_loop(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, struct sd_event *result)
 574 {
 575         hook_ditf(closure, hookid, export, "get_event_loop", NULL);
 576 }
 577
 578 static void hook_ditf_get_user_bus(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, struct sd_bus *result)
 579 {
 580         hook_ditf(closure, hookid, export, "get_user_bus", NULL);
 581 }
 582
 583 static void hook_ditf_get_system_bus(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, struct sd_bus *result)
 584 {
 585         hook_ditf(closure, hookid, export, "get_system_bus", NULL);
 586 }
 587
 588 static void hook_ditf_vverbose(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)
 589 {
 590         struct json_object *pos;
 591         int len;
 592         char *msg;
 593         va_list ap;
 594
 595         pos = NULL;
 596         msg = NULL;
 597
 598         va_copy(ap, args);
 599         len = vasprintf(&msg, fmt, ap);
 600         va_end(ap);
 601
 602         if (file)
 603                 wrap_json_pack(&pos, "{ss si ss*}", "file", file, "line", line, "function", function);
 604
 605         hook_ditf(closure, hookid, export, "vverbose", "{si ss* ss? so*}",
 606                                         "level", level,
 607                                         "type", verbosity_level_name(level),
 608                                         len < 0 ? "format" : "message", len < 0 ? fmt : msg,
 609                                         "position", pos);
 610
 611         free(msg);
 612 }
 613
 614 static void hook_ditf_event_make(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *name, struct afb_event result)
 615 {
 616         hook_ditf(closure, hookid, export, "event_make", "{ss ss si}",
 617                         "name", name, "event", afb_evt_event_name(result), "id", afb_evt_event_id(result));
 618 }
 619
 620 static void hook_ditf_rootdir_get_fd(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int result)
 621 {
 622         char path[PATH_MAX];
 623
 624         if (result >= 0) {
 625                 sprintf(path, "/proc/self/fd/%d", result);
 626                 readlink(path, path, sizeof path);
 627         }
 628
 629         hook_ditf(closure, hookid, export, "rootdir_get_fd", "{ss}",
 630                         result < 0 ? "path" : "error",
 631                         result < 0 ? strerror(errno) : path);
 632 }
 633
 634 static void hook_ditf_rootdir_open_locale(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *filename, int flags, const char *locale, int result)
 635 {
 636         char path[PATH_MAX];
 637
 638         if (result >= 0) {
 639                 sprintf(path, "/proc/self/fd/%d", result);
 640                 readlink(path, path, sizeof path);
 641         }
 642
 643         hook_ditf(closure, hookid, export, "rootdir_open_locale", "{ss si ss* ss}",
 644                         "file", filename,
 645                         "flags", flags,
 646                         "locale", locale,
 647                         result < 0 ? "path" : "error",
 648                         result < 0 ? strerror(errno) : path);
 649 }
 650
 651 static void hook_ditf_queue_job(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)
 652 {
 653         hook_ditf(closure, hookid, export, "queue_job", "{ss}", "result", result);
 654 }
 655
 656 static void hook_ditf_unstore_req(void * closure, const struct afb_hookid *hookid, const struct afb_export *export, struct afb_stored_req *sreq)
 657 {
 658         hook_ditf(closure, hookid, export, "unstore_req", NULL);
 659 }
 660
 661 static void hook_ditf_require_api(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *name, int initialized)
 662 {
 663         hook_ditf(closure, hookid, export, "require_api", "{ss sb}", "name", name, "initialized", initialized);
 664 }
 665
 666 static void hook_ditf_require_api_result(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *name, int initialized, int result)
 667 {
 668         hook_ditf(closure, hookid, export, "require_api_result", "{ss sb si}", "name", name, "initialized", initialized, "result", result);
 669 }
 670
 671 static struct afb_hook_ditf_itf hook_ditf_itf = {
 672         .hook_ditf_event_broadcast_before = hook_ditf_event_broadcast_before,
 673         .hook_ditf_event_broadcast_after = hook_ditf_event_broadcast_after,
 674         .hook_ditf_get_event_loop = hook_ditf_get_event_loop,
 675         .hook_ditf_get_user_bus = hook_ditf_get_user_bus,
 676         .hook_ditf_get_system_bus = hook_ditf_get_system_bus,
 677         .hook_ditf_vverbose = hook_ditf_vverbose,
 678         .hook_ditf_event_make = hook_ditf_event_make,
 679         .hook_ditf_rootdir_get_fd = hook_ditf_rootdir_get_fd,
 680         .hook_ditf_rootdir_open_locale = hook_ditf_rootdir_open_locale,
 681         .hook_ditf_queue_job = hook_ditf_queue_job,
 682         .hook_ditf_unstore_req = hook_ditf_unstore_req,
 683         .hook_ditf_require_api = hook_ditf_require_api,
 684         .hook_ditf_require_api_result = hook_ditf_require_api_result
 685 };
 686
 687 /*******************************************************************************/
 688 /*****  trace the services                                                 *****/
 689 /*******************************************************************************/
 690
 691 static struct flag svc_flags[] = { /* must be sorted by names */
 692                 { "all",                afb_hook_flags_svc_all },
 693                 { "call",               afb_hook_flag_svc_call },
 694                 { "call_result",        afb_hook_flag_svc_call_result },
 695                 { "callsync",           afb_hook_flag_svc_callsync },
 696                 { "callsync_result",    afb_hook_flag_svc_callsync_result },
 697                 { "on_event_after",     afb_hook_flag_svc_on_event_after },
 698                 { "on_event_before",    afb_hook_flag_svc_on_event_before },
 699                 { "start_after",        afb_hook_flag_svc_start_after },
 700                 { "start_before",       afb_hook_flag_svc_start_before },
 701 };
 702
 703 /* get the export value for flag of 'name' */
 704 static int get_svc_flag(const char *name)
 705 {
 706         return get_flag(name, svc_flags, (int)(sizeof svc_flags / sizeof *svc_flags));
 707 }
 708
 709 static void hook_svc(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *action, const char *format, ...)
 710 {
 711         va_list ap;
 712
 713         va_start(ap, format);
 714         emit(closure, hookid, "service", "{ss ss}", format, ap,
 715                                         "api", afb_export_apiname(export),
 716                                         "action", action);
 717         va_end(ap);
 718 }
 719
 720 static void hook_svc_start_before(void *closure, const struct afb_hookid *hookid, const struct afb_export *export)
 721 {
 722         hook_svc(closure, hookid, export, "start_before", NULL);
 723 }
 724
 725 static void hook_svc_start_after(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int status)
 726 {
 727         hook_svc(closure, hookid, export, "start_after", "{si}", "result", status);
 728 }
 729
 730 static void hook_svc_on_event_before(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *event, int eventid, struct json_object *object)
 731 {
 732         hook_svc(closure, hookid, export, "on_event_before", "{ss si sO*}",
 733                         "event", event, "id", eventid, "data", object);
 734 }
 735
 736 static void hook_svc_on_event_after(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *event, int eventid, struct json_object *object)
 737 {
 738         hook_svc(closure, hookid, export, "on_event_after", "{ss si sO*}",
 739                         "event", event, "id", eventid, "data", object);
 740 }
 741
 742 static void hook_svc_call(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *api, const char *verb, struct json_object *args)
 743 {
 744         hook_svc(closure, hookid, export, "call", "{ss ss sO*}",
 745                         "api", api, "verb", verb, "args", args);
 746 }
 747
 748 static void hook_svc_call_result(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int status, struct json_object *result)
 749 {
 750         hook_svc(closure, hookid, export, "call_result", "{si sO*}",
 751                         "status", status, "result", result);
 752 }
 753
 754 static void hook_svc_callsync(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *api, const char *verb, struct json_object *args)
 755 {
 756         hook_svc(closure, hookid, export, "callsync", "{ss ss sO*}",
 757                         "api", api, "verb", verb, "args", args);
 758 }
 759
 760 static void hook_svc_callsync_result(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int status, struct json_object *result)
 761 {
 762         hook_svc(closure, hookid, export, "callsync_result", "{si sO*}",
 763                         "status", status, "result", result);
 764 }
 765
 766 static struct afb_hook_svc_itf hook_svc_itf = {
 767         .hook_svc_start_before = hook_svc_start_before,
 768         .hook_svc_start_after = hook_svc_start_after,
 769         .hook_svc_on_event_before = hook_svc_on_event_before,
 770         .hook_svc_on_event_after = hook_svc_on_event_after,
 771         .hook_svc_call = hook_svc_call,
 772         .hook_svc_call_result = hook_svc_call_result,
 773         .hook_svc_callsync = hook_svc_callsync,
 774         .hook_svc_callsync_result = hook_svc_callsync_result
 775 };
 776
 777 /*******************************************************************************/
 778 /*****  trace the events                                                   *****/
 779 /*******************************************************************************/
 780
 781 static struct flag evt_flags[] = { /* must be sorted by names */
 782                 { "all",                afb_hook_flags_evt_all },
 783                 { "broadcast_after",    afb_hook_flag_evt_broadcast_after },
 784                 { "broadcast_before",   afb_hook_flag_evt_broadcast_before },
 785                 { "common",             afb_hook_flags_evt_common },
 786                 { "create",             afb_hook_flag_evt_create },
 787                 { "drop",               afb_hook_flag_evt_drop },
 788                 { "extra",              afb_hook_flags_evt_extra },
 789                 { "name",               afb_hook_flag_evt_name },
 790                 { "push_after",         afb_hook_flag_evt_push_after },
 791                 { "push_before",        afb_hook_flag_evt_push_before },
 792 };
 793
 794 /* get the evt value for flag of 'name' */
 795 static int get_evt_flag(const char *name)
 796 {
 797         return get_flag(name, evt_flags, (int)(sizeof evt_flags / sizeof *evt_flags));
 798 }
 799
 800 static void hook_evt(void *closure, const struct afb_hookid *hookid, const char *evt, int id, const char *action, const char *format, ...)
 801 {
 802         va_list ap;
 803
 804         va_start(ap, format);
 805         emit(closure, hookid, "event", "{si ss ss}", format, ap,
 806                                         "id", id,
 807                                         "name", evt,
 808                                         "action", action);
 809         va_end(ap);
 810 }
 811
 812 static void hook_evt_create(void *closure, const struct afb_hookid *hookid, const char *evt, int id)
 813 {
 814         hook_evt(closure, hookid, evt, id, "create", NULL);
 815 }
 816
 817 static void hook_evt_push_before(void *closure, const struct afb_hookid *hookid, const char *evt, int id, struct json_object *obj)
 818 {
 819         hook_evt(closure, hookid, evt, id, "push_before", "{sO*}", "data", obj);
 820 }
 821
 822
 823 static void hook_evt_push_after(void *closure, const struct afb_hookid *hookid, const char *evt, int id, struct json_object *obj, int result)
 824 {
 825         hook_evt(closure, hookid, evt, id, "push_after", "{sO* si}", "data", obj, "result", result);
 826 }
 827
 828 static void hook_evt_broadcast_before(void *closure, const struct afb_hookid *hookid, const char *evt, int id, struct json_object *obj)
 829 {
 830         hook_evt(closure, hookid, evt, id, "broadcast_before", "{sO*}", "data", obj);
 831 }
 832
 833 static void hook_evt_broadcast_after(void *closure, const struct afb_hookid *hookid, const char *evt, int id, struct json_object *obj, int result)
 834 {
 835         hook_evt(closure, hookid, evt, id, "broadcast_after", "{sO* si}", "data", obj, "result", result);
 836 }
 837
 838 static void hook_evt_name(void *closure, const struct afb_hookid *hookid, const char *evt, int id)
 839 {
 840         hook_evt(closure, hookid, evt, id, "name", NULL);
 841 }
 842
 843 static void hook_evt_drop(void *closure, const struct afb_hookid *hookid, const char *evt, int id)
 844 {
 845         hook_evt(closure, hookid, evt, id, "drop", NULL);
 846 }
 847
 848 static struct afb_hook_evt_itf hook_evt_itf = {
 849         .hook_evt_create = hook_evt_create,
 850         .hook_evt_push_before = hook_evt_push_before,
 851         .hook_evt_push_after = hook_evt_push_after,
 852         .hook_evt_broadcast_before = hook_evt_broadcast_before,
 853         .hook_evt_broadcast_after = hook_evt_broadcast_after,
 854         .hook_evt_name = hook_evt_name,
 855         .hook_evt_drop = hook_evt_drop
 856 };
 857
 858 /*******************************************************************************/
 859 /*****  trace the globals                                                  *****/
 860 /*******************************************************************************/
 861
 862 static struct flag global_flags[] = { /* must be sorted by names */
 863                 { "all",                afb_hook_flags_global_all },
 864                 { "vverbose",           afb_hook_flag_global_vverbose },
 865 };
 866
 867 /* get the global value for flag of 'name' */
 868 static int get_global_flag(const char *name)
 869 {
 870         return get_flag(name, global_flags, (int)(sizeof global_flags / sizeof *global_flags));
 871 }
 872
 873 static void hook_global(void *closure, const struct afb_hookid *hookid, const char *action, const char *format, ...)
 874 {
 875         va_list ap;
 876
 877         va_start(ap, format);
 878         emit(closure, hookid, "global", "{ss}", format, ap, "action", action);
 879         va_end(ap);
 880 }
 881
 882 static void hook_global_vverbose(void *closure, const struct afb_hookid *hookid, int level, const char *file, int line, const char *function, const char *fmt, va_list args)
 883 {
 884         struct json_object *pos;
 885         int len;
 886         char *msg;
 887         va_list ap;
 888
 889         pos = NULL;
 890         msg = NULL;
 891
 892         va_copy(ap, args);
 893         len = vasprintf(&msg, fmt, ap);
 894         va_end(ap);
 895
 896         if (file)
 897                 wrap_json_pack(&pos, "{ss si ss*}", "file", file, "line", line, "function", function);
 898
 899         hook_global(closure, hookid, "vverbose", "{si ss* ss? so*}",
 900                                         "level", level,
 901                                         "type", verbosity_level_name(level),
 902                                         len < 0 ? "format" : "message", len < 0 ? fmt : msg,
 903                                         "position", pos);
 904
 905         free(msg);
 906 }
 907
 908 static struct afb_hook_global_itf hook_global_itf = {
 909         .hook_global_vverbose = hook_global_vverbose,
 910 };
 911
 912 /*******************************************************************************/
 913 /*****  abstract types                                                     *****/
 914 /*******************************************************************************/
 915
 916 static
 917 struct
 918 {
 919         const char *name;
 920         void (*unref)(void*);
 921         int (*get_flag)(const char*);
 922 }
 923 abstracting[Trace_Type_Count] =
 924 {
 925         [Trace_Type_Xreq] =
 926         {
 927                 .name = "request",
 928                 .unref =  (void(*)(void*))afb_hook_unref_xreq,
 929                 .get_flag = get_xreq_flag
 930         },
 931         [Trace_Type_Ditf] =
 932         {
 933                 .name = "daemon",
 934                 .unref =  (void(*)(void*))afb_hook_unref_ditf,
 935                 .get_flag = get_ditf_flag
 936         },
 937         [Trace_Type_Svc] =
 938         {
 939                 .name = "service",
 940                 .unref =  (void(*)(void*))afb_hook_unref_svc,
 941                 .get_flag = get_svc_flag
 942         },
 943         [Trace_Type_Evt] =
 944         {
 945                 .name = "event",
 946                 .unref =  (void(*)(void*))afb_hook_unref_evt,
 947                 .get_flag = get_evt_flag
 948         },
 949         [Trace_Type_Global] =
 950         {
 951                 .name = "global",
 952                 .unref =  (void(*)(void*))afb_hook_unref_global,
 953                 .get_flag = get_global_flag
 954         },
 955 };
 956
 957 /*******************************************************************************/
 958 /*****  handle trace data                                                  *****/
 959 /*******************************************************************************/
 960
 961 /* drop hooks of 'trace' matching 'tag' and 'event' and 'session' */
 962 static void trace_unhook(struct afb_trace *trace, struct tag *tag, struct event *event, struct session *session)
 963 {
 964         int i;
 965         struct hook *hook, **prev;
 966
 967         /* remove any event */
 968         for (i = 0 ; i < Trace_Type_Count ; i++) {
 969                 prev = &trace->hooks[i];
 970                 while ((hook = *prev)) {
 971                         if ((tag && tag != hook->tag)
 972                          || (event && event != hook->event)
 973                          || (session && session != hook->session))
 974                                 prev = &hook->next;
 975                         else {
 976                                 *prev = hook->next;
 977                                 abstracting[i].unref(hook->handler);
 978                                 free(hook);
 979                         }
 980                 }
 981         }
 982 }
 983
 984 /* cleanup: removes unused tags, events and sessions of the 'trace' */
 985 static void trace_cleanup(struct afb_trace *trace)
 986 {
 987         int i;
 988         struct hook *hook;
 989         struct tag *tag, **ptag;
 990         struct event *event, **pevent;
 991         struct session *session, **psession;
 992
 993         /* clean sessions */
 994         psession = &trace->sessions;
 995         while ((session = *psession)) {
 996                 /* search for session */
 997                 for (hook = NULL, i = 0 ; !hook && i < Trace_Type_Count ; i++)
 998                         for (hook = trace->hooks[i] ; hook && hook->session != session ; hook = hook->next);
 999                 /* keep or free whether used or not */
1000                 if (hook)
1001                         psession = &session->next;
1002                 else {
1003                         *psession = session->next;
1004                         if (__atomic_exchange_n(&session->trace, NULL, __ATOMIC_RELAXED))
1005                                 afb_session_set_cookie(session->session, session, NULL, NULL);
1006                         free(session);
1007                 }
1008         }
1009         /* clean tags */
1010         ptag = &trace->tags;
1011         while ((tag = *ptag)) {
1012                 /* search for tag */
1013                 for (hook = NULL, i = 0 ; !hook && i < Trace_Type_Count ; i++)
1014                         for (hook = trace->hooks[i] ; hook && hook->tag != tag ; hook = hook->next);
1015                 /* keep or free whether used or not */
1016                 if (hook)
1017                         ptag = &tag->next;
1018                 else {
1019                         *ptag = tag->next;
1020                         free(tag);
1021                 }
1022         }
1023         /* clean events */
1024         pevent = &trace->events;
1025         while ((event = *pevent)) {
1026                 /* search for event */
1027                 for (hook = NULL, i = 0 ; !hook && i < Trace_Type_Count ; i++)
1028                         for (hook = trace->hooks[i] ; hook && hook->event != event ; hook = hook->next);
1029                 /* keep or free whether used or not */
1030                 if (hook)
1031                         pevent = &event->next;
1032                 else {
1033                         *pevent = event->next;
1034                         afb_event_drop(event->event);
1035                         free(event);
1036                 }
1037         }
1038 }
1039
1040 /* callback at end of traced session */
1041 static void free_session_cookie(void *cookie)
1042 {
1043         struct session *session = cookie;
1044         struct afb_trace *trace = __atomic_exchange_n(&session->trace, NULL, __ATOMIC_RELAXED);
1045         if (trace) {
1046                 pthread_mutex_lock(&trace->mutex);
1047                 trace_unhook(trace, NULL, NULL, session);
1048                 trace_cleanup(trace);
1049                 pthread_mutex_unlock(&trace->mutex);
1050         }
1051 }
1052
1053 /*
1054  * Get the tag of 'name' within 'trace'.
1055  * If 'alloc' isn't zero, create the tag and add it.
1056  */
1057 static struct tag *trace_get_tag(struct afb_trace *trace, const char *name, int alloc)
1058 {
1059         struct tag *tag;
1060
1061         /* search the tag of 'name' */
1062         tag = trace->tags;
1063         while (tag && strcmp(name, tag->tag))
1064                 tag = tag->next;
1065
1066         if (!tag && alloc) {
1067                 /* creation if needed */
1068                 tag = malloc(sizeof * tag + strlen(name));
1069                 if (tag) {
1070                         strcpy(tag->tag, name);
1071                         tag->next = trace->tags;
1072                         trace->tags = tag;
1073                 }
1074         }
1075         return tag;
1076 }
1077
1078 /*
1079  * Get the event of 'name' within 'trace'.
1080  * If 'alloc' isn't zero, create the event and add it.
1081  */
1082 static struct event *trace_get_event(struct afb_trace *trace, const char *name, int alloc)
1083 {
1084         struct event *event;
1085
1086         /* search the event */
1087         event = trace->events;
1088         while (event && strcmp(afb_event_name(event->event), name))
1089                 event = event->next;
1090
1091         if (!event && alloc) {
1092                 event = malloc(sizeof * event);
1093                 if (event) {
1094                         event->event = trace->daemon->itf->event_make(trace->daemon->closure, name);
1095                         if (afb_event_is_valid(event->event)) {
1096                                 event->next = trace->events;
1097                                 trace->events = event;
1098                         } else {
1099                                 free(event);
1100                                 event = NULL;
1101                         }
1102                 }
1103         }
1104         return event;
1105 }
1106
1107 /*
1108  * Get the session of 'value' within 'trace'.
1109  * If 'alloc' isn't zero, create the session and add it.
1110  */
1111 static struct session *trace_get_session(struct afb_trace *trace, struct afb_session *value, int alloc)
1112 {
1113         struct session *session;
1114
1115         /* search the session */
1116         session = trace->sessions;
1117         while (session && session->session != value)
1118                 session = session->next;
1119
1120         if (!session && alloc) {
1121                 session = malloc(sizeof * session);
1122                 if (session) {
1123                         session->session = value;
1124                         session->trace = NULL;
1125                         session->next = trace->sessions;
1126                         trace->sessions = session;
1127                 }
1128         }
1129         return session;
1130 }
1131
1132 /*
1133  * Get the session of 'uuid' within 'trace'.
1134  * If 'alloc' isn't zero, create the session and add it.
1135  */
1136 static struct session *trace_get_session_by_uuid(struct afb_trace *trace, const char *uuid, int alloc)
1137 {
1138         struct afb_session *session;
1139         int created;
1140
1141         session = afb_session_get(uuid, alloc ? &created : NULL);
1142         return session ? trace_get_session(trace, session, alloc) : NULL;
1143 }
1144
1145 static struct hook *trace_make_detached_hook(struct afb_trace *trace, const char *event, const char *tag)
1146 {
1147         struct hook *hook;
1148
1149         tag = tag ?: DEFAULT_TAG_NAME;
1150         event = event ?: DEFAULT_EVENT_NAME;
1151         hook = malloc(sizeof *hook);
1152         if (hook) {
1153                 hook->tag = trace_get_tag(trace, tag, 1);
1154                 hook->event = trace_get_event(trace, event, 1);
1155                 hook->session = NULL;
1156                 hook->handler = NULL;
1157         }
1158         return hook;
1159 }
1160
1161 static void trace_attach_hook(struct afb_trace *trace, struct hook *hook, enum trace_type type)
1162 {
1163         struct session *session = hook->session;
1164         hook->next = trace->hooks[type];
1165         trace->hooks[type] = hook;
1166         if (session && !session->trace) {
1167                 session->trace = trace;
1168                 afb_session_set_cookie(session->session, session, session, free_session_cookie);
1169         }
1170 }
1171
1172 /*******************************************************************************/
1173 /*****  handle client requests                                             *****/
1174 /*******************************************************************************/
1175
1176 struct context
1177 {
1178         struct afb_trace *trace;
1179         struct afb_req req;
1180         char *errors;
1181 };
1182
1183 struct desc
1184 {
1185         struct context *context;
1186         const char *name;
1187         const char *tag;
1188         const char *session;
1189         const char *api;
1190         const char *verb;
1191         const char *pattern;
1192         int flags[Trace_Type_Count];
1193 };
1194
1195
1196 static void addhook(struct desc *desc, enum trace_type type)
1197 {
1198         struct hook *hook;
1199         struct session *session;
1200         struct afb_session *bind;
1201         struct afb_trace *trace = desc->context->trace;
1202
1203         /* check permission for bound traces */
1204         bind = trace->bound;
1205         if (bind != NULL) {
1206                 if (type != Trace_Type_Xreq) {
1207                         ctxt_error(&desc->context->errors, "tracing %s is forbidden", abstracting[type].name);
1208                         return;
1209                 }
1210                 if (desc->session) {
1211                         ctxt_error(&desc->context->errors, "setting session is forbidden");
1212                         return;
1213                 }
1214         }
1215
1216         /* allocate the hook */
1217         hook = trace_make_detached_hook(trace, desc->name, desc->tag);
1218         if (!hook) {
1219                 ctxt_error(&desc->context->errors, "allocation of hook failed");
1220                 return;
1221         }
1222
1223         /* create the hook handler */
1224         switch (type) {
1225         case Trace_Type_Xreq:
1226                 if (desc->session) {
1227                         session = trace_get_session_by_uuid(trace, desc->session, 1);
1228                         if (!session) {
1229                                 ctxt_error(&desc->context->errors, "allocation of session failed");
1230                                 free(hook);
1231                                 return;
1232                         }
1233                         bind = session->session;
1234                 }
1235                 hook->handler = afb_hook_create_xreq(desc->api, desc->verb, bind,
1236                                 desc->flags[type], &hook_xreq_itf, hook);
1237                 break;
1238         case Trace_Type_Ditf:
1239                 hook->handler = afb_hook_create_ditf(desc->api, desc->flags[type], &hook_ditf_itf, hook);
1240                 break;
1241         case Trace_Type_Svc:
1242                 hook->handler = afb_hook_create_svc(desc->api, desc->flags[type], &hook_svc_itf, hook);
1243                 break;
1244         case Trace_Type_Evt:
1245                 hook->handler = afb_hook_create_evt(desc->pattern, desc->flags[type], &hook_evt_itf, hook);
1246                 break;
1247         case Trace_Type_Global:
1248                 hook->handler = afb_hook_create_global(desc->flags[type], &hook_global_itf, hook);
1249                 break;
1250         default:
1251                 break;
1252         }
1253         if (!hook->handler) {
1254                 ctxt_error(&desc->context->errors, "creation of hook failed");
1255                 free(hook);
1256                 return;
1257         }
1258
1259         /* attach and activate the hook */
1260         afb_req_subscribe(desc->context->req, hook->event->event);
1261         trace_attach_hook(trace, hook, type);
1262 }
1263
1264 static void addhooks(struct desc *desc)
1265 {
1266         int i;
1267
1268         for (i = 0 ; i < Trace_Type_Count ; i++) {
1269                 if (desc->flags[i])
1270                         addhook(desc, i);
1271         }
1272 }
1273
1274 static void add_flags(void *closure, struct json_object *object, enum trace_type type)
1275 {
1276         int value;
1277         const char *name, *queried;
1278         struct desc *desc = closure;
1279
1280         if (wrap_json_unpack(object, "s", &name))
1281                 ctxt_error(&desc->context->errors, "unexpected %s value %s",
1282                                         abstracting[type].name,
1283                                         json_object_to_json_string(object));
1284         else {
1285                 queried = (name[0] == '*' && !name[1]) ? "all" : name;
1286                 value = abstracting[type].get_flag(queried);
1287                 if (value)
1288                         desc->flags[type] |= value;
1289                 else
1290                         ctxt_error(&desc->context->errors, "unknown %s name %s",
1291                                         abstracting[type].name, name);
1292         }
1293 }
1294
1295 static void add_xreq_flags(void *closure, struct json_object *object)
1296 {
1297         add_flags(closure, object, Trace_Type_Xreq);
1298 }
1299
1300 static void add_ditf_flags(void *closure, struct json_object *object)
1301 {
1302         add_flags(closure, object, Trace_Type_Ditf);
1303 }
1304
1305 static void add_svc_flags(void *closure, struct json_object *object)
1306 {
1307         add_flags(closure, object, Trace_Type_Svc);
1308 }
1309
1310 static void add_evt_flags(void *closure, struct json_object *object)
1311 {
1312         add_flags(closure, object, Trace_Type_Evt);
1313 }
1314
1315 static void add_global_flags(void *closure, struct json_object *object)
1316 {
1317         add_flags(closure, object, Trace_Type_Global);
1318 }
1319
1320 /* add hooks */
1321 static void add(void *closure, struct json_object *object)
1322 {
1323         int rc;
1324         struct desc desc;
1325         struct json_object *request, *event, *daemon, *service, *sub, *global;
1326
1327         memcpy (&desc, closure, sizeof desc);
1328         request = event = daemon = service = sub = global = NULL;
1329
1330         rc = wrap_json_unpack(object, "{s?s s?s s?s s?s s?s s?s s?o s?o s?o s?o s?o s?o}",
1331                         "name", &desc.name,
1332                         "tag", &desc.tag,
1333                         "api", &desc.api,
1334                         "verb", &desc.verb,
1335                         "session", &desc.session,
1336                         "pattern", &desc.pattern,
1337                         "request", &request,
1338                         "daemon", &daemon,
1339                         "service", &service,
1340                         "event", &event,
1341                         "global", &global,
1342                         "for", &sub);
1343
1344         if (!rc) {
1345                 /* replace stars */
1346                 if (desc.api && desc.api[0] == '*' && !desc.api[1])
1347                         desc.api = NULL;
1348
1349                 if (desc.verb && desc.verb[0] == '*' && !desc.verb[1])
1350                         desc.verb = NULL;
1351
1352                 if (desc.session && desc.session[0] == '*' && !desc.session[1])
1353                         desc.session = NULL;
1354
1355                 /* get what is expected */
1356                 if (request)
1357                         wrap_json_optarray_for_all(request, add_xreq_flags, &desc);
1358
1359                 if (daemon)
1360                         wrap_json_optarray_for_all(daemon, add_ditf_flags, &desc);
1361
1362                 if (service)
1363                         wrap_json_optarray_for_all(service, add_svc_flags, &desc);
1364
1365                 if (event)
1366                         wrap_json_optarray_for_all(event, add_evt_flags, &desc);
1367
1368                 if (global)
1369                         wrap_json_optarray_for_all(global, add_global_flags, &desc);
1370
1371                 /* apply */
1372                 if (sub)
1373                         wrap_json_optarray_for_all(sub, add, &desc);
1374                 else
1375                         addhooks(&desc);
1376         }
1377         else {
1378                 wrap_json_optarray_for_all(object, add_xreq_flags, &desc);
1379                 addhooks(&desc);
1380         }
1381 }
1382
1383 /* drop hooks of given tag */
1384 static void drop_tag(void *closure, struct json_object *object)
1385 {
1386         int rc;
1387         struct context *context = closure;
1388         struct tag *tag;
1389         const char *name;
1390
1391         rc = wrap_json_unpack(object, "s", &name);
1392         if (rc)
1393                 ctxt_error(&context->errors, "unexpected tag value %s", json_object_to_json_string(object));
1394         else {
1395                 tag = trace_get_tag(context->trace, name, 0);
1396                 if (!tag)
1397                         ctxt_error(&context->errors, "tag %s not found", name);
1398                 else
1399                         trace_unhook(context->trace, tag, NULL, NULL);
1400         }
1401 }
1402
1403 /* drop hooks of given event */
1404 static void drop_event(void *closure, struct json_object *object)
1405 {
1406         int rc;
1407         struct context *context = closure;
1408         struct event *event;
1409         const char *name;
1410
1411         rc = wrap_json_unpack(object, "s", &name);
1412         if (rc)
1413                 ctxt_error(&context->errors, "unexpected event value %s", json_object_to_json_string(object));
1414         else {
1415                 event = trace_get_event(context->trace, name, 0);
1416                 if (!event)
1417                         ctxt_error(&context->errors, "event %s not found", name);
1418                 else
1419                         trace_unhook(context->trace, NULL, event, NULL);
1420         }
1421 }
1422
1423 /* drop hooks of given session */
1424 static void drop_session(void *closure, struct json_object *object)
1425 {
1426         int rc;
1427         struct context *context = closure;
1428         struct session *session;
1429         const char *uuid;
1430
1431         rc = wrap_json_unpack(object, "s", &uuid);
1432         if (rc)
1433                 ctxt_error(&context->errors, "unexpected session value %s", json_object_to_json_string(object));
1434         else {
1435                 session = trace_get_session_by_uuid(context->trace, uuid, 0);
1436                 if (!session)
1437                         ctxt_error(&context->errors, "session %s not found", uuid);
1438                 else
1439                         trace_unhook(context->trace, NULL, NULL, session);
1440         }
1441 }
1442
1443 /*******************************************************************************/
1444 /*****  public interface                                                   *****/
1445 /*******************************************************************************/
1446
1447 /* allocates an afb_trace instance */
1448 struct afb_trace *afb_trace_create(struct afb_daemon *daemon, struct afb_session *bound)
1449 {
1450         struct afb_trace *trace;
1451
1452         assert(daemon);
1453
1454         trace = calloc(1, sizeof *trace);
1455         if (trace) {
1456                 trace->refcount = 1;
1457                 trace->bound = bound;
1458                 trace->daemon = daemon;
1459                 pthread_mutex_init(&trace->mutex, NULL);
1460         }
1461         return trace;
1462 }
1463
1464 /* add a reference to the trace */
1465 void afb_trace_addref(struct afb_trace *trace)
1466 {
1467         __atomic_add_fetch(&trace->refcount, 1, __ATOMIC_RELAXED);
1468 }
1469
1470 /* drop one reference to the trace */
1471 void afb_trace_unref(struct afb_trace *trace)
1472 {
1473         if (trace && !__atomic_sub_fetch(&trace->refcount, 1, __ATOMIC_RELAXED)) {
1474                 /* clean hooks */
1475                 trace_unhook(trace, NULL, NULL, NULL);
1476                 trace_cleanup(trace);
1477                 pthread_mutex_destroy(&trace->mutex);
1478                 free(trace);
1479         }
1480 }
1481
1482 /* add traces */
1483 int afb_trace_add(struct afb_req req, struct json_object *args, struct afb_trace *trace)
1484 {
1485         struct context context;
1486         struct desc desc;
1487
1488         memset(&context, 0, sizeof context);
1489         context.trace = trace;
1490         context.req = req;
1491
1492         memset(&desc, 0, sizeof desc);
1493         desc.context = &context;
1494
1495         pthread_mutex_lock(&trace->mutex);
1496         wrap_json_optarray_for_all(args, add, &desc);
1497         pthread_mutex_unlock(&trace->mutex);
1498
1499         if (!context.errors)
1500                 return 0;
1501
1502         afb_req_fail(req, "error-detected", context.errors);
1503         free(context.errors);
1504         return -1;
1505 }
1506
1507 /* drop traces */
1508 extern int afb_trace_drop(struct afb_req req, struct json_object *args, struct afb_trace *trace)
1509 {
1510         int rc;
1511         struct context context;
1512         struct json_object *tags, *events, *sessions;
1513
1514         memset(&context, 0, sizeof context);
1515         context.trace = trace;
1516         context.req = req;
1517
1518         /* special: boolean value */
1519         if (!wrap_json_unpack(args, "b", &rc)) {
1520                 if (rc) {
1521                         pthread_mutex_lock(&trace->mutex);
1522                         trace_unhook(trace, NULL, NULL, NULL);
1523                         trace_cleanup(trace);
1524                         pthread_mutex_unlock(&trace->mutex);
1525                 }
1526                 return 0;
1527         }
1528
1529         tags = events = sessions = NULL;
1530         rc = wrap_json_unpack(args, "{s?o s?o s?o}",
1531                         "event", &events,
1532                         "tag", &tags,
1533                         "session", &sessions);
1534
1535         if (rc < 0 || !(events || tags || sessions)) {
1536                 afb_req_fail(req, "error-detected", "bad drop arguments");
1537                 return -1;
1538         }
1539
1540         pthread_mutex_lock(&trace->mutex);
1541
1542         if (tags)
1543                 wrap_json_optarray_for_all(tags, drop_tag, &context);
1544
1545         if (events)
1546                 wrap_json_optarray_for_all(events, drop_event, &context);
1547
1548         if (sessions)
1549                 wrap_json_optarray_for_all(sessions, drop_session, &context);
1550
1551         trace_cleanup(trace);
1552
1553         pthread_mutex_unlock(&trace->mutex);
1554
1555         if (!context.errors)
1556                 return 0;
1557
1558         afb_req_fail(req, "error-detected", context.errors);
1559         free(context.errors);
1560         return -1;
1561 }
1562