X-Git-Url: https://gerrit.automotivelinux.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fafb-hook.c;h=909c5126119cf6b26faf4cfe93e199abc3863db6;hb=f3d1f19ae308cc0559728c0ccf6281cbce5ee37c;hp=e16d67049373ac2763d62a68f786c1753cb89191;hpb=522569c5a9da8566f5213fa5b9b3abadf746331d;p=src%2Fapp-framework-binder.git diff --git a/src/afb-hook.c b/src/afb-hook.c index e16d6704..909c5126 100644 --- a/src/afb-hook.c +++ b/src/afb-hook.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2016, 2017 "IoT.bzh" + * Copyright (C) 2016-2019 "IoT.bzh" * Author José Bollo * * Licensed under the Apache License, Version 2.0 (the "License"); @@ -15,206 +15,408 @@ * limitations under the License. */ +#if WITH_AFB_HOOK /***********************************************************/ + #define _GNU_SOURCE +#include #include #include #include #include +#include +#include #include +#if !defined(JSON_C_TO_STRING_NOSLASHESCAPE) +#define JSON_C_TO_STRING_NOSLASHESCAPE 0 +#endif -#include -#include +#include +#include #include "afb-context.h" #include "afb-hook.h" #include "afb-session.h" +#include "afb-cred.h" #include "afb-xreq.h" +#include "afb-export.h" +#include "afb-evt.h" +#include "afb-api.h" +#include "afb-msg-json.h" #include "verbose.h" +#include +#define MATCH(pattern,string) (\ + pattern \ + ? !fnmatch((pattern),(string),FNM_CASEFOLD|FNM_EXTMATCH|FNM_PERIOD) \ + : afb_api_is_public(string)) + +#define MATCH_API(pattern,string) MATCH(pattern,string) +#define MATCH_VERB(pattern,string) MATCH(pattern,string) +#define MATCH_EVENT(pattern,string) MATCH(pattern,string) +#define MATCH_SESSION(pattern,string) MATCH(pattern,string) + /** - * Definition of a hook + * Definition of a hook for xreq */ -struct afb_hook { - struct afb_hook *next; /**< next hook */ +struct afb_hook_xreq { + struct afb_hook_xreq *next; /**< next hook */ unsigned refcount; /**< reference count */ + unsigned flags; /**< hook flags */ char *api; /**< api hooked or NULL for any */ char *verb; /**< verb hooked or NULL for any */ struct afb_session *session; /**< session hooked or NULL if any */ + struct afb_hook_xreq_itf *itf; /**< interface of hook */ + void *closure; /**< closure for callbacks */ +}; + +/** + * Definition of a hook for export + */ +struct afb_hook_api { + struct afb_hook_api *next; /**< next hook */ + unsigned refcount; /**< reference count */ unsigned flags; /**< hook flags */ - struct afb_hook_xreq_itf *reqitf; /**< interface of hook */ + char *api; /**< api hooked or NULL for any */ + struct afb_hook_api_itf *itf; /**< interface of hook */ void *closure; /**< closure for callbacks */ }; -/* - * Structure for handling subcalls callbacks +/** + * Definition of a hook for evt + */ +struct afb_hook_evt { + struct afb_hook_evt *next; /**< next hook */ + unsigned refcount; /**< reference count */ + unsigned flags; /**< hook flags */ + char *pattern; /**< event pattern name hooked or NULL for any */ + struct afb_hook_evt_itf *itf; /**< interface of hook */ + void *closure; /**< closure for callbacks */ +}; + +/** + * Definition of a hook for session + */ +struct afb_hook_session { + struct afb_hook_session *next; /**< next hook */ + unsigned refcount; /**< reference count */ + unsigned flags; /**< hook flags */ + char *pattern; /**< event pattern name hooked or NULL for any */ + struct afb_hook_session_itf *itf; /**< interface of hook */ + void *closure; /**< closure for callbacks */ +}; + +/** + * Definition of a hook for global */ -struct hook_subcall { - struct afb_xreq *xreq; /* hookd request */ - void (*callback)(void*, int, struct json_object*); /* client callback */ - void *cb_closure; /* cient closure */ +struct afb_hook_global { + struct afb_hook_global *next; /**< next hook */ + unsigned refcount; /**< reference count */ + unsigned flags; /**< hook flags */ + struct afb_hook_global_itf *itf; /**< interface of hook */ + void *closure; /**< closure for callbacks */ }; -/* synchronisation across threads */ +/* synchronization across threads */ static pthread_rwlock_t rwlock = PTHREAD_RWLOCK_INITIALIZER; +static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; + +/* list of hooks for xreq */ +static struct afb_hook_xreq *list_of_xreq_hooks = NULL; + +/* list of hooks for export */ +static struct afb_hook_api *list_of_api_hooks = NULL; -/* list of hooks */ -static struct afb_hook *list_of_hooks = NULL; +/* list of hooks for evt */ +static struct afb_hook_evt *list_of_evt_hooks = NULL; + +/* list of hooks for session */ +static struct afb_hook_session *list_of_session_hooks = NULL; + +/* list of hooks for global */ +static struct afb_hook_global *list_of_global_hooks = NULL; + +/* hook id */ +static unsigned next_hookid = 0; + +/****************************************************************************** + * section: hook id + *****************************************************************************/ +static void init_hookid(struct afb_hookid *hookid) +{ + hookid->id = __atomic_add_fetch(&next_hookid, 1, __ATOMIC_RELAXED); + clock_gettime(CLOCK_REALTIME, &hookid->time); +} /****************************************************************************** * section: default callbacks for tracing requests *****************************************************************************/ +static char *_pbuf_(const char *fmt, va_list args, char **palloc, char *sbuf, size_t szsbuf, size_t *outlen) +{ + int rc; + va_list cp; + + *palloc = NULL; + va_copy(cp, args); + rc = vsnprintf(sbuf, szsbuf, fmt, args); + if ((size_t)rc >= szsbuf) { + sbuf[szsbuf-1] = 0; + sbuf[szsbuf-2] = sbuf[szsbuf-3] = sbuf[szsbuf-4] = '.'; + rc = vasprintf(palloc, fmt, cp); + if (rc >= 0) + sbuf = *palloc; + } + va_end(cp); + if (rc >= 0 && outlen) + *outlen = (size_t)rc; + return sbuf; +} + +static void _hook_(const char *fmt1, const char *fmt2, va_list arg2, ...) +{ + static const char chars[] = "HOOK: [] \n"; + char *mem1, *mem2, buf1[256], buf2[2000]; + struct iovec iov[5]; + va_list arg1; + + /* "HOOK: [" */ + iov[0].iov_base = (void*)&chars[0]; + iov[0].iov_len = 7; + + /* fmt1 ... */ + va_start(arg1, arg2); + iov[1].iov_base = _pbuf_(fmt1, arg1, &mem1, buf1, sizeof buf1, &iov[1].iov_len); + va_end(arg1); + + /* "] " */ + iov[2].iov_base = (void*)&chars[7]; + iov[2].iov_len = 2; + + /* fmt2 arg2 */ + iov[3].iov_base = _pbuf_(fmt2, arg2, &mem2, buf2, sizeof buf2, &iov[3].iov_len); + + /* "\n" */ + iov[4].iov_base = (void*)&chars[9]; + iov[4].iov_len = 1; + + (void)writev(2, iov, 5); + + free(mem1); + free(mem2); +} + static void _hook_xreq_(const struct afb_xreq *xreq, const char *format, ...) { - int len; - char *buffer; va_list ap; - va_start(ap, format); - len = vasprintf(&buffer, format, ap); + _hook_("xreq-%06d:%s/%s", format, ap, xreq->hookindex, xreq->request.called_api, xreq->request.called_verb); va_end(ap); - - if (len < 0) - NOTICE("hook xreq-%06d:%s/%s allocation error", xreq->hookindex, xreq->api, xreq->verb); - else { - NOTICE("hook xreq-%06d:%s/%s %s", xreq->hookindex, xreq->api, xreq->verb, buffer); - free(buffer); - } } -static void hook_xreq_begin_default_cb(void * closure, const struct afb_xreq *xreq) +static void hook_xreq_begin_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq) { - _hook_xreq_(xreq, "BEGIN"); + struct afb_cred *cred = xreq->context.credentials; + + if (!cred) + _hook_xreq_(xreq, "BEGIN"); + else + _hook_xreq_(xreq, "BEGIN uid=%d=%s gid=%d pid=%d label=%s id=%s", + (int)cred->uid, + cred->user, + (int)cred->gid, + (int)cred->pid, + cred->label?:"(null)", + cred->id?:"(null)" + ); } -static void hook_xreq_end_default_cb(void * closure, const struct afb_xreq *xreq) +static void hook_xreq_end_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq) { _hook_xreq_(xreq, "END"); } -static void hook_xreq_json_default_cb(void * closure, const struct afb_xreq *xreq, struct json_object *obj) +static void hook_xreq_json_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct json_object *obj) { - _hook_xreq_(xreq, "json() -> %s", json_object_to_json_string(obj)); + _hook_xreq_(xreq, "json() -> %s", json_object_to_json_string_ext(obj, JSON_C_TO_STRING_NOSLASHESCAPE)); } -static void hook_xreq_get_default_cb(void * closure, const struct afb_xreq *xreq, const char *name, struct afb_arg arg) +static void hook_xreq_get_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *name, struct afb_arg arg) { _hook_xreq_(xreq, "get(%s) -> { name: %s, value: %s, path: %s }", name, arg.name, arg.value, arg.path); } -static void hook_xreq_success_default_cb(void * closure, const struct afb_xreq *xreq, struct json_object *obj, const char *info) +static void hook_xreq_reply_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct json_object *obj, const char *error, const char *info) { - _hook_xreq_(xreq, "success(%s, %s)", json_object_to_json_string(obj), info); + _hook_xreq_(xreq, "reply[%s](%s, %s)", error?:"success", json_object_to_json_string_ext(obj, JSON_C_TO_STRING_NOSLASHESCAPE), info); } -static void hook_xreq_fail_default_cb(void * closure, const struct afb_xreq *xreq, const char *status, const char *info) +static void hook_xreq_legacy_context_get_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, void *value) { - _hook_xreq_(xreq, "fail(%s, %s)", status, info); + _hook_xreq_(xreq, "context_get() -> %p", value); } -static void hook_xreq_raw_default_cb(void * closure, const struct afb_xreq *xreq, const char *buffer, size_t size) +static void hook_xreq_legacy_context_set_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, void *value, void (*free_value)(void*)) { - _hook_xreq_(xreq, "raw() -> %.*s", (int)size, buffer); + _hook_xreq_(xreq, "context_set(%p, %p)", value, free_value); } -static void hook_xreq_send_default_cb(void * closure, const struct afb_xreq *xreq, const char *buffer, size_t size) +static void hook_xreq_addref_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq) { - _hook_xreq_(xreq, "send(%.*s)", (int)size, buffer); + _hook_xreq_(xreq, "addref()"); } -static void hook_xreq_context_get_default_cb(void * closure, const struct afb_xreq *xreq, void *value) +static void hook_xreq_unref_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq) { - _hook_xreq_(xreq, "context_get() -> %p", value); + _hook_xreq_(xreq, "unref()"); } -static void hook_xreq_context_set_default_cb(void * closure, const struct afb_xreq *xreq, void *value, void (*free_value)(void*)) +static void hook_xreq_session_close_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq) { - _hook_xreq_(xreq, "context_set(%p, %p)", value, free_value); + _hook_xreq_(xreq, "session_close()"); } -static void hook_xreq_addref_default_cb(void * closure, const struct afb_xreq *xreq) +static void hook_xreq_session_set_LOA_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, unsigned level, int result) { - _hook_xreq_(xreq, "addref()"); + _hook_xreq_(xreq, "session_set_LOA(%u) -> %d", level, result); } -static void hook_xreq_unref_default_cb(void * closure, const struct afb_xreq *xreq) +static void hook_xreq_subscribe_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct afb_event_x2 *event_x2, int result) { - _hook_xreq_(xreq, "unref()"); + _hook_xreq_(xreq, "subscribe(%s:%d) -> %d", afb_evt_event_x2_fullname(event_x2), afb_evt_event_x2_id(event_x2), result); } -static void hook_xreq_session_close_default_cb(void * closure, const struct afb_xreq *xreq) +static void hook_xreq_unsubscribe_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct afb_event_x2 *event_x2, int result) { - _hook_xreq_(xreq, "session_close()"); + _hook_xreq_(xreq, "unsubscribe(%s:%d) -> %d", afb_evt_event_x2_fullname(event_x2), afb_evt_event_x2_id(event_x2), result); } -static void hook_xreq_session_set_LOA_default_cb(void * closure, const struct afb_xreq *xreq, unsigned level, int result) +static void hook_xreq_subcall_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args) { - _hook_xreq_(xreq, "session_set_LOA(%u) -> %d", level, result); + _hook_xreq_(xreq, "subcall(%s/%s, %s) ...", api, verb, json_object_to_json_string_ext(args, JSON_C_TO_STRING_NOSLASHESCAPE)); +} + +static void hook_xreq_subcall_result_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct json_object *object, const char *error, const char *info) +{ + _hook_xreq_(xreq, " ...subcall... [%s] -> %s (%s)", error?:"success", json_object_to_json_string_ext(object, JSON_C_TO_STRING_NOSLASHESCAPE), info?:""); +} + +static void hook_xreq_subcallsync_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args) +{ + _hook_xreq_(xreq, "subcallsync(%s/%s, %s) ...", api, verb, json_object_to_json_string_ext(args, JSON_C_TO_STRING_NOSLASHESCAPE)); +} + +static void hook_xreq_subcallsync_result_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, int status, struct json_object *object, const char *error, const char *info) +{ + _hook_xreq_(xreq, " ...subcallsync... %d [%s] -> %s (%s)", status, error?:"success", json_object_to_json_string_ext(object, JSON_C_TO_STRING_NOSLASHESCAPE), info?:""); +} + +static void hook_xreq_vverbose_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, int level, const char *file, int line, const char *func, const char *fmt, va_list args) +{ + int len; + char *msg; + va_list ap; + + va_copy(ap, args); + len = vasprintf(&msg, fmt, ap); + va_end(ap); + + if (len < 0) + _hook_xreq_(xreq, "vverbose(%d:%s, %s, %d, %s) -> %s ? ? ?", level, verbose_name_of_level(level), file, line, func, fmt); + else { + _hook_xreq_(xreq, "vverbose(%d:%s, %s, %d, %s) -> %s", level, verbose_name_of_level(level), file, line, func, msg); + free(msg); + } +} + +static void hook_xreq_legacy_store_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct afb_stored_req *sreq) +{ + _hook_xreq_(xreq, "store() -> %p", sreq); +} + +static void hook_xreq_legacy_unstore_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq) +{ + _hook_xreq_(xreq, "unstore()"); +} + +static void hook_xreq_has_permission_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, const char *permission, int result) +{ + _hook_xreq_(xreq, "has_permission(%s) -> %d", permission, result); } -static void hook_xreq_subscribe_default_cb(void * closure, const struct afb_xreq *xreq, struct afb_event event, int result) +static void hook_xreq_get_application_id_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, char *result) { - _hook_xreq_(xreq, "subscribe(%s:%p) -> %d", afb_event_name(event), event.closure, result); + _hook_xreq_(xreq, "get_application_id() -> %s", result); } -static void hook_xreq_unsubscribe_default_cb(void * closure, const struct afb_xreq *xreq, struct afb_event event, int result) +static void hook_xreq_context_make_cb(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) { - _hook_xreq_(xreq, "unsubscribe(%s:%p) -> %d", afb_event_name(event), event.closure, result); + _hook_xreq_(xreq, "context_make(replace=%s, %p, %p, %p) -> %p", replace?"yes":"no", create_value, free_value, create_closure, result); } -static void hook_xreq_subcall_default_cb(void * closure, const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args) +static void hook_xreq_get_uid_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, int result) { - _hook_xreq_(xreq, "subcall(%s/%s, %s) ...", api, verb, json_object_to_json_string(args)); + _hook_xreq_(xreq, "get_uid() -> %d", result); } -static void hook_xreq_subcall_result_default_cb(void * closure, const struct afb_xreq *xreq, int status, struct json_object *result) +static void hook_xreq_get_client_info_cb(void *closure, const struct afb_hookid *hookid, const struct afb_xreq *xreq, struct json_object *result) { - _hook_xreq_(xreq, " ...subcall... -> %d: %s", status, json_object_to_json_string(result)); + _hook_xreq_(xreq, "get_client_info() -> %s", json_object_to_json_string_ext(result, JSON_C_TO_STRING_NOSLASHESCAPE)); } static struct afb_hook_xreq_itf hook_xreq_default_itf = { - .hook_xreq_begin = hook_xreq_begin_default_cb, - .hook_xreq_end = hook_xreq_end_default_cb, - .hook_xreq_json = hook_xreq_json_default_cb, - .hook_xreq_get = hook_xreq_get_default_cb, - .hook_xreq_success = hook_xreq_success_default_cb, - .hook_xreq_fail = hook_xreq_fail_default_cb, - .hook_xreq_raw = hook_xreq_raw_default_cb, - .hook_xreq_send = hook_xreq_send_default_cb, - .hook_xreq_context_get = hook_xreq_context_get_default_cb, - .hook_xreq_context_set = hook_xreq_context_set_default_cb, - .hook_xreq_addref = hook_xreq_addref_default_cb, - .hook_xreq_unref = hook_xreq_unref_default_cb, - .hook_xreq_session_close = hook_xreq_session_close_default_cb, - .hook_xreq_session_set_LOA = hook_xreq_session_set_LOA_default_cb, - .hook_xreq_subscribe = hook_xreq_subscribe_default_cb, - .hook_xreq_unsubscribe = hook_xreq_unsubscribe_default_cb, - .hook_xreq_subcall = hook_xreq_subcall_default_cb, - .hook_xreq_subcall_result = hook_xreq_subcall_result_default_cb, + .hook_xreq_begin = hook_xreq_begin_cb, + .hook_xreq_end = hook_xreq_end_cb, + .hook_xreq_json = hook_xreq_json_cb, + .hook_xreq_get = hook_xreq_get_cb, + .hook_xreq_reply = hook_xreq_reply_cb, + .hook_xreq_legacy_context_get = hook_xreq_legacy_context_get_cb, + .hook_xreq_legacy_context_set = hook_xreq_legacy_context_set_cb, + .hook_xreq_addref = hook_xreq_addref_cb, + .hook_xreq_unref = hook_xreq_unref_cb, + .hook_xreq_session_close = hook_xreq_session_close_cb, + .hook_xreq_session_set_LOA = hook_xreq_session_set_LOA_cb, + .hook_xreq_subscribe = hook_xreq_subscribe_cb, + .hook_xreq_unsubscribe = hook_xreq_unsubscribe_cb, + .hook_xreq_subcall = hook_xreq_subcall_cb, + .hook_xreq_subcall_result = hook_xreq_subcall_result_cb, + .hook_xreq_subcallsync = hook_xreq_subcallsync_cb, + .hook_xreq_subcallsync_result = hook_xreq_subcallsync_result_cb, + .hook_xreq_vverbose = hook_xreq_vverbose_cb, + .hook_xreq_legacy_store = hook_xreq_legacy_store_cb, + .hook_xreq_legacy_unstore = hook_xreq_legacy_unstore_cb, + .hook_xreq_has_permission = hook_xreq_has_permission_cb, + .hook_xreq_get_application_id = hook_xreq_get_application_id_cb, + .hook_xreq_context_make = hook_xreq_context_make_cb, + .hook_xreq_get_uid = hook_xreq_get_uid_cb, + .hook_xreq_get_client_info = hook_xreq_get_client_info_cb, }; /****************************************************************************** * section: hooks for tracing requests *****************************************************************************/ -#define _HOOK_XREQ_(what,...) \ - struct afb_hook *hook; \ +#define _HOOK_XREQ_2_(flag,func,...) \ + struct afb_hook_xreq *hook; \ + struct afb_hookid hookid; \ pthread_rwlock_rdlock(&rwlock); \ - hook = list_of_hooks; \ + init_hookid(&hookid); \ + hook = list_of_xreq_hooks; \ while (hook) { \ - if (hook->reqitf->hook_xreq_##what \ - && (hook->flags & afb_hook_flag_req_##what) != 0 \ + if (hook->refcount \ + && hook->itf->hook_xreq_##func \ + && (hook->flags & afb_hook_flag_req_##flag) != 0 \ && (!hook->session || hook->session == xreq->context.session) \ - && (!hook->api || !strcasecmp(hook->api, xreq->api)) \ - && (!hook->verb || !strcasecmp(hook->verb, xreq->verb))) { \ - hook->reqitf->hook_xreq_##what(hook->closure, __VA_ARGS__); \ + && MATCH_API(hook->api, xreq->request.called_api) \ + && MATCH_VERB(hook->verb, xreq->request.called_verb)) { \ + hook->itf->hook_xreq_##func(hook->closure, &hookid, __VA_ARGS__); \ } \ hook = hook->next; \ } \ pthread_rwlock_unlock(&rwlock); +#define _HOOK_XREQ_(what,...) _HOOK_XREQ_2_(what,what,__VA_ARGS__) void afb_hook_xreq_begin(const struct afb_xreq *xreq) { @@ -238,36 +440,20 @@ struct afb_arg afb_hook_xreq_get(const struct afb_xreq *xreq, const char *name, return arg; } -void afb_hook_xreq_success(const struct afb_xreq *xreq, struct json_object *obj, const char *info) -{ - _HOOK_XREQ_(success, xreq, obj, info); -} - -void afb_hook_xreq_fail(const struct afb_xreq *xreq, const char *status, const char *info) +void afb_hook_xreq_reply(const struct afb_xreq *xreq, struct json_object *obj, const char *error, const char *info) { - _HOOK_XREQ_(fail, xreq, status, info); + _HOOK_XREQ_(reply, xreq, obj, error, info); } -const char *afb_hook_xreq_raw(const struct afb_xreq *xreq, const char *buffer, size_t size) +void *afb_hook_xreq_legacy_context_get(const struct afb_xreq *xreq, void *value) { - _HOOK_XREQ_(raw, xreq, buffer, size); - return buffer; -} - -void afb_hook_xreq_send(const struct afb_xreq *xreq, const char *buffer, size_t size) -{ - _HOOK_XREQ_(send, xreq, buffer, size); -} - -void *afb_hook_xreq_context_get(const struct afb_xreq *xreq, void *value) -{ - _HOOK_XREQ_(context_get, xreq, value); + _HOOK_XREQ_(legacy_context_get, xreq, value); return value; } -void afb_hook_xreq_context_set(const struct afb_xreq *xreq, void *value, void (*free_value)(void*)) +void afb_hook_xreq_legacy_context_set(const struct afb_xreq *xreq, void *value, void (*free_value)(void*)) { - _HOOK_XREQ_(context_set, xreq, value, free_value); + _HOOK_XREQ_(legacy_context_set, xreq, value, free_value); } void afb_hook_xreq_addref(const struct afb_xreq *xreq) @@ -291,50 +477,106 @@ int afb_hook_xreq_session_set_LOA(const struct afb_xreq *xreq, unsigned level, i return result; } -int afb_hook_xreq_subscribe(const struct afb_xreq *xreq, struct afb_event event, int result) +int afb_hook_xreq_subscribe(const struct afb_xreq *xreq, struct afb_event_x2 *event_x2, int result) { - _HOOK_XREQ_(subscribe, xreq, event, result); + _HOOK_XREQ_(subscribe, xreq, event_x2, result); return result; } -int afb_hook_xreq_unsubscribe(const struct afb_xreq *xreq, struct afb_event event, int result) +int afb_hook_xreq_unsubscribe(const struct afb_xreq *xreq, struct afb_event_x2 *event_x2, int result) { - _HOOK_XREQ_(unsubscribe, xreq, event, result); + _HOOK_XREQ_(unsubscribe, xreq, event_x2, result); return result; } -void afb_hook_xreq_subcall(const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args) +void afb_hook_xreq_subcall(const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, int flags) { _HOOK_XREQ_(subcall, xreq, api, verb, args); } -void afb_hook_xreq_subcall_result(const struct afb_xreq *xreq, int status, struct json_object *result) +void afb_hook_xreq_subcall_result(const struct afb_xreq *xreq, struct json_object *object, const char *error, const char *info) +{ + _HOOK_XREQ_(subcall_result, xreq, object, error, info); +} + +void afb_hook_xreq_subcallsync(const struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, int flags) +{ + _HOOK_XREQ_(subcallsync, xreq, api, verb, args); +} + +int afb_hook_xreq_subcallsync_result(const struct afb_xreq *xreq, int status, struct json_object *object, const char *error, const char *info) +{ + _HOOK_XREQ_(subcallsync_result, xreq, status, object, error, info); + return status; +} + +void afb_hook_xreq_vverbose(const struct afb_xreq *xreq, int level, const char *file, int line, const char *func, const char *fmt, va_list args) +{ + _HOOK_XREQ_(vverbose, xreq, level, file ?: "?", line, func ?: "?", fmt, args); +} + +void afb_hook_xreq_legacy_store(const struct afb_xreq *xreq, struct afb_stored_req *sreq) +{ + _HOOK_XREQ_(legacy_store, xreq, sreq); +} + +void afb_hook_xreq_legacy_unstore(const struct afb_xreq *xreq) +{ + _HOOK_XREQ_(legacy_unstore, xreq); +} + +int afb_hook_xreq_has_permission(const struct afb_xreq *xreq, const char *permission, int result) { - _HOOK_XREQ_(subcall_result, xreq, status, result); + _HOOK_XREQ_(has_permission, xreq, permission, result); + return result; +} + +char *afb_hook_xreq_get_application_id(const struct afb_xreq *xreq, char *result) +{ + _HOOK_XREQ_(get_application_id, xreq, result); + return result; +} + +void *afb_hook_xreq_context_make(const struct afb_xreq *xreq, int replace, void *(*create_value)(void*), void (*free_value)(void*), void *create_closure, void *result) +{ + _HOOK_XREQ_(context_make, xreq, replace, create_value, free_value, create_closure, result); + return result; +} + +int afb_hook_xreq_get_uid(const struct afb_xreq *xreq, int result) +{ + _HOOK_XREQ_(get_uid, xreq, result); + return result; +} + +struct json_object *afb_hook_xreq_get_client_info(const struct afb_xreq *xreq, struct json_object *result) +{ + _HOOK_XREQ_(get_client_info, xreq, result); + return result; } /****************************************************************************** - * section: + * section: hooking xreqs *****************************************************************************/ void afb_hook_init_xreq(struct afb_xreq *xreq) { - static int reqindex; + static int reqindex = 0; int f, flags; - int add; - struct afb_hook *hook; + int add, x; + struct afb_hook_xreq *hook; /* scan hook list to get the expected flags */ flags = 0; pthread_rwlock_rdlock(&rwlock); - hook = list_of_hooks; + hook = list_of_xreq_hooks; while (hook) { f = hook->flags & afb_hook_flags_req_all; add = f != 0 && (!hook->session || hook->session == xreq->context.session) - && (!hook->api || !strcasecmp(hook->api, xreq->api)) - && (!hook->verb || !strcasecmp(hook->verb, xreq->verb)); + && MATCH_API(hook->api, xreq->request.called_api) + && MATCH_VERB(hook->verb, xreq->request.called_verb); if (add) flags |= f; hook = hook->next; @@ -344,20 +586,19 @@ void afb_hook_init_xreq(struct afb_xreq *xreq) /* store the hooking data */ xreq->hookflags = flags; if (flags) { - pthread_rwlock_wrlock(&rwlock); - if (++reqindex < 0) - reqindex = 1; - xreq->hookindex = reqindex; - pthread_rwlock_unlock(&rwlock); + do { + x = __atomic_load_n(&reqindex, __ATOMIC_RELAXED); + xreq->hookindex = (x + 1) % 1000000 ?: 1; + } while (x != __atomic_exchange_n(&reqindex, xreq->hookindex, __ATOMIC_RELAXED)); } } -struct afb_hook *afb_hook_xreq_create(const char *api, const char *verb, struct afb_session *session, unsigned flags, struct afb_hook_xreq_itf *itf, void *closure) +struct afb_hook_xreq *afb_hook_create_xreq(const char *api, const char *verb, struct afb_session *session, int flags, struct afb_hook_xreq_itf *itf, void *closure) { - struct afb_hook *hook; + struct afb_hook_xreq *hook; /* alloc the result */ - hook = malloc(sizeof *hook); + hook = calloc(1, sizeof *hook); if (hook == NULL) return NULL; @@ -377,46 +618,49 @@ struct afb_hook *afb_hook_xreq_create(const char *api, const char *verb, struct afb_session_addref(session); hook->refcount = 1; hook->flags = flags; - hook->reqitf = itf ? itf : &hook_xreq_default_itf; + hook->itf = itf ? itf : &hook_xreq_default_itf; hook->closure = closure; /* record the hook */ - pthread_rwlock_wrlock(&rwlock); - hook->next = list_of_hooks; - list_of_hooks = hook; - pthread_rwlock_unlock(&rwlock); + pthread_mutex_lock(&mutex); + hook->next = list_of_xreq_hooks; + list_of_xreq_hooks = hook; + pthread_mutex_unlock(&mutex); /* returns it */ return hook; } -struct afb_hook *afb_hook_addref(struct afb_hook *hook) +struct afb_hook_xreq *afb_hook_addref_xreq(struct afb_hook_xreq *hook) { - pthread_rwlock_wrlock(&rwlock); - hook->refcount++; - pthread_rwlock_unlock(&rwlock); + __atomic_add_fetch(&hook->refcount, 1, __ATOMIC_RELAXED); return hook; } -void afb_hook_unref(struct afb_hook *hook) +static void hook_clean_xreq() { - struct afb_hook **prv; - - if (hook) { - pthread_rwlock_wrlock(&rwlock); - if (--hook->refcount) - hook = NULL; - else { - /* unlink */ - prv = &list_of_hooks; - while (*prv && *prv != hook) + struct afb_hook_xreq **prv, *hook, *head; + + if (pthread_rwlock_trywrlock(&rwlock) == 0) { + /* unlink under mutex */ + head = NULL; + pthread_mutex_lock(&mutex); + prv = &list_of_xreq_hooks; + while ((hook = *prv)) { + if (hook->refcount) prv = &(*prv)->next; - if(*prv) + else { *prv = hook->next; + hook->next = head; + head = hook; + } } + pthread_mutex_unlock(&mutex); pthread_rwlock_unlock(&rwlock); - if (hook) { - /* free */ + + /* free found hooks */ + while((hook = head)) { + head = hook->next; free(hook->api); free(hook->verb); if (hook->session) @@ -426,3 +670,1175 @@ void afb_hook_unref(struct afb_hook *hook) } } +void afb_hook_unref_xreq(struct afb_hook_xreq *hook) +{ + if (hook && !__atomic_sub_fetch(&hook->refcount, 1, __ATOMIC_RELAXED)) + hook_clean_xreq(); +} + +/****************************************************************************** + * section: default callbacks for tracing daemon interface + *****************************************************************************/ + +static void _hook_api_(const struct afb_export *export, const char *format, ...) +{ + va_list ap; + va_start(ap, format); + _hook_("api-%s", format, ap, afb_export_apiname(export)); + va_end(ap); +} + +static void hook_api_event_broadcast_before_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *name, struct json_object *object) +{ + _hook_api_(export, "event_broadcast.before(%s, %s)....", name, json_object_to_json_string_ext(object, JSON_C_TO_STRING_NOSLASHESCAPE)); +} + +static void hook_api_event_broadcast_after_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *name, struct json_object *object, int result) +{ + _hook_api_(export, "event_broadcast.after(%s, %s) -> %d", name, json_object_to_json_string_ext(object, JSON_C_TO_STRING_NOSLASHESCAPE), result); +} + +static void hook_api_get_event_loop_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, struct sd_event *result) +{ + _hook_api_(export, "get_event_loop() -> %p", result); +} + +static void hook_api_get_user_bus_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, struct sd_bus *result) +{ + _hook_api_(export, "get_user_bus() -> %p", result); +} + +static void hook_api_get_system_bus_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, struct sd_bus *result) +{ + _hook_api_(export, "get_system_bus() -> %p", result); +} + +static void hook_api_vverbose_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int level, const char *file, int line, const char *function, const char *fmt, va_list args) +{ + int len; + char *msg; + va_list ap; + + va_copy(ap, args); + len = vasprintf(&msg, fmt, ap); + va_end(ap); + + if (len < 0) + _hook_api_(export, "vverbose(%d:%s, %s, %d, %s) -> %s ? ? ?", level, verbose_name_of_level(level), file, line, function, fmt); + else { + _hook_api_(export, "vverbose(%d:%s, %s, %d, %s) -> %s", level, verbose_name_of_level(level), file, line, function, msg); + free(msg); + } +} + +static void hook_api_event_make_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *name, struct afb_event_x2 *result) +{ + _hook_api_(export, "event_make(%s) -> %s:%d", name, afb_evt_event_x2_fullname(result), afb_evt_event_x2_id(result)); +} + +static void hook_api_rootdir_get_fd_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int result) +{ + char path[PATH_MAX], proc[100]; + ssize_t s; + + if (result < 0) + _hook_api_(export, "rootdir_get_fd() -> %d, %m", result); + else { + snprintf(proc, sizeof proc, "/proc/self/fd/%d", result); + s = readlink(proc, path, sizeof path); + path[s < 0 ? 0 : s >= sizeof path ? sizeof path - 1 : s] = 0; + _hook_api_(export, "rootdir_get_fd() -> %d = %s", result, path); + } +} + +static void hook_api_rootdir_open_locale_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *filename, int flags, const char *locale, int result) +{ + char path[PATH_MAX], proc[100]; + ssize_t s; + + if (!locale) + locale = "(null)"; + if (result < 0) + _hook_api_(export, "rootdir_open_locale(%s, %d, %s) -> %d, %m", filename, flags, locale, result); + else { + snprintf(proc, sizeof proc, "/proc/self/fd/%d", result); + s = readlink(proc, path, sizeof path); + path[s < 0 ? 0 : s >= sizeof path ? sizeof path - 1 : s] = 0; + _hook_api_(export, "rootdir_open_locale(%s, %d, %s) -> %d = %s", filename, flags, locale, result, path); + } +} + +static void hook_api_queue_job_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, void (*callback)(int signum, void *arg), void *argument, void *group, int timeout, int result) +{ + _hook_api_(export, "queue_job(%p, %p, %p, %d) -> %d", callback, argument, group, timeout, result); +} + +static void hook_api_unstore_req_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, struct afb_stored_req *sreq) +{ + _hook_api_(export, "unstore_req(%p)", sreq); +} + +static void hook_api_require_api_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *name, int initialized) +{ + _hook_api_(export, "require_api(%s, %d)...", name, initialized); +} + +static void hook_api_require_api_result_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *name, int initialized, int result) +{ + _hook_api_(export, "...require_api(%s, %d) -> %d", name, initialized, result); +} + +static void hook_api_add_alias_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *api, const char *alias, int result) +{ + _hook_api_(export, "add_alias(%s -> %s) -> %d", api, alias?:"", result); +} + +static void hook_api_start_before_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export) +{ + _hook_api_(export, "start.before"); +} + +static void hook_api_start_after_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int status) +{ + _hook_api_(export, "start.after -> %d", status); +} + +static void hook_api_on_event_before_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *event, int event_x2, struct json_object *object) +{ + _hook_api_(export, "on_event.before(%s, %d, %s)", event, event_x2, json_object_to_json_string_ext(object, JSON_C_TO_STRING_NOSLASHESCAPE)); +} + +static void hook_api_on_event_after_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *event, int event_x2, struct json_object *object) +{ + _hook_api_(export, "on_event.after(%s, %d, %s)", event, event_x2, json_object_to_json_string_ext(object, JSON_C_TO_STRING_NOSLASHESCAPE)); +} + +static void hook_api_call_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *api, const char *verb, struct json_object *args) +{ + _hook_api_(export, "call(%s/%s, %s) ...", api, verb, json_object_to_json_string_ext(args, JSON_C_TO_STRING_NOSLASHESCAPE)); +} + +static void hook_api_call_result_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, struct json_object *object, const char *error, const char *info) +{ + _hook_api_(export, " ...call... [%s] -> %s (%s)", error?:"success", json_object_to_json_string_ext(object, JSON_C_TO_STRING_NOSLASHESCAPE), info?:""); +} + +static void hook_api_callsync_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *api, const char *verb, struct json_object *args) +{ + _hook_api_(export, "callsync(%s/%s, %s) ...", api, verb, json_object_to_json_string_ext(args, JSON_C_TO_STRING_NOSLASHESCAPE)); +} + +static void hook_api_callsync_result_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int status, struct json_object *object, const char *error, const char *info) +{ + _hook_api_(export, " ...callsync... %d [%s] -> %s (%s)", status, error?:"success", json_object_to_json_string_ext(object, JSON_C_TO_STRING_NOSLASHESCAPE), info?:""); +} + +static void hook_api_new_api_before_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *api, const char *info, int noconcurrency) +{ + _hook_api_(export, "new_api.before %s (%s)%s ...", api, info?:"", noconcurrency?" no-concurrency" : ""); +} + +static void hook_api_new_api_after_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int result, const char *api) +{ + _hook_api_(export, "... new_api.after %s -> %s (%d)", api, result >= 0 ? "OK" : "ERROR", result); +} + +static void hook_api_api_set_verbs_v2_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int result, const struct afb_verb_v2 *verbs) +{ + _hook_api_(export, "set_verbs_v2 -> %s (%d)", result >= 0 ? "OK" : "ERROR", result); +} + +static void hook_api_api_set_verbs_v3_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int result, const struct afb_verb_v3 *verbs) +{ + _hook_api_(export, "set_verbs_v3 -> %s (%d)", result >= 0 ? "OK" : "ERROR", result); +} + +static void hook_api_api_add_verb_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int result, const char *verb, const char *info, int glob) +{ + _hook_api_(export, "add_verb(%s%s [%s]) -> %s (%d)", verb, glob?" (GLOB)":"", info?:"", result >= 0 ? "OK" : "ERROR", result); +} + +static void hook_api_api_del_verb_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int result, const char *verb) +{ + _hook_api_(export, "del_verb(%s) -> %s (%d)", verb, result >= 0 ? "OK" : "ERROR", result); +} + +static void hook_api_api_set_on_event_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int result) +{ + _hook_api_(export, "set_on_event -> %s (%d)", result >= 0 ? "OK" : "ERROR", result); +} + +static void hook_api_api_set_on_init_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int result) +{ + _hook_api_(export, "set_on_init -> %s (%d)", result >= 0 ? "OK" : "ERROR", result); +} + +static void hook_api_api_seal_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export) +{ + _hook_api_(export, "seal"); +} + +static void hook_api_event_handler_add_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int result, const char *pattern) +{ + _hook_api_(export, "event_handler_add(%s) -> %s (%d)", pattern, result >= 0 ? "OK" : "ERROR", result); +} + +static void hook_api_event_handler_del_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int result, const char *pattern) +{ + _hook_api_(export, "event_handler_del(%s) -> %s (%d)", pattern, result >= 0 ? "OK" : "ERROR", result); +} + +static void hook_api_class_provide_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int result, const char *name) +{ + _hook_api_(export, "class_provide(%s) -> %s (%d)", name, result >= 0 ? "OK" : "ERROR", result); +} + +static void hook_api_class_require_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int result, const char *name) +{ + _hook_api_(export, "class_require(%s) -> %s (%d)", name, result >= 0 ? "OK" : "ERROR", result); +} + +static void hook_api_delete_api_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, int result) +{ + _hook_api_(export, "delete_api -> %s (%d)", result >= 0 ? "OK" : "ERROR", result); +} + +static void hook_api_on_event_handler_before_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *event, int event_x2, struct json_object *object, const char *pattern) +{ + _hook_api_(export, "on_event_handler[%s].before(%s, %d, %s)", pattern, event, event_x2, json_object_to_json_string_ext(object, JSON_C_TO_STRING_NOSLASHESCAPE)); +} + +static void hook_api_on_event_handler_after_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, const char *event, int event_x2, struct json_object *object, const char *pattern) +{ + _hook_api_(export, "on_event_handler[%s].after(%s, %d, %s)", pattern, event, event_x2, json_object_to_json_string_ext(object, JSON_C_TO_STRING_NOSLASHESCAPE)); +} + +static void hook_api_settings_cb(void *closure, const struct afb_hookid *hookid, const struct afb_export *export, struct json_object *object) +{ + _hook_api_(export, "settings -> %s", json_object_to_json_string_ext(object, JSON_C_TO_STRING_NOSLASHESCAPE)); +} + +static struct afb_hook_api_itf hook_api_default_itf = { + .hook_api_event_broadcast_before = hook_api_event_broadcast_before_cb, + .hook_api_event_broadcast_after = hook_api_event_broadcast_after_cb, + .hook_api_get_event_loop = hook_api_get_event_loop_cb, + .hook_api_get_user_bus = hook_api_get_user_bus_cb, + .hook_api_get_system_bus = hook_api_get_system_bus_cb, + .hook_api_vverbose = hook_api_vverbose_cb, + .hook_api_event_make = hook_api_event_make_cb, + .hook_api_rootdir_get_fd = hook_api_rootdir_get_fd_cb, + .hook_api_rootdir_open_locale = hook_api_rootdir_open_locale_cb, + .hook_api_queue_job = hook_api_queue_job_cb, + .hook_api_legacy_unstore_req = hook_api_unstore_req_cb, + .hook_api_require_api = hook_api_require_api_cb, + .hook_api_require_api_result = hook_api_require_api_result_cb, + .hook_api_add_alias = hook_api_add_alias_cb, + .hook_api_start_before = hook_api_start_before_cb, + .hook_api_start_after = hook_api_start_after_cb, + .hook_api_on_event_before = hook_api_on_event_before_cb, + .hook_api_on_event_after = hook_api_on_event_after_cb, + .hook_api_call = hook_api_call_cb, + .hook_api_call_result = hook_api_call_result_cb, + .hook_api_callsync = hook_api_callsync_cb, + .hook_api_callsync_result = hook_api_callsync_result_cb, + .hook_api_new_api_before = hook_api_new_api_before_cb, + .hook_api_new_api_after = hook_api_new_api_after_cb, + .hook_api_api_set_verbs_v2 = hook_api_api_set_verbs_v2_cb, + .hook_api_api_set_verbs_v3 = hook_api_api_set_verbs_v3_cb, + .hook_api_api_add_verb = hook_api_api_add_verb_cb, + .hook_api_api_del_verb = hook_api_api_del_verb_cb, + .hook_api_api_set_on_event = hook_api_api_set_on_event_cb, + .hook_api_api_set_on_init = hook_api_api_set_on_init_cb, + .hook_api_api_seal = hook_api_api_seal_cb, + .hook_api_event_handler_add = hook_api_event_handler_add_cb, + .hook_api_event_handler_del = hook_api_event_handler_del_cb, + .hook_api_class_provide = hook_api_class_provide_cb, + .hook_api_class_require = hook_api_class_require_cb, + .hook_api_delete_api = hook_api_delete_api_cb, + .hook_api_on_event_handler_before = hook_api_on_event_handler_before_cb, + .hook_api_on_event_handler_after = hook_api_on_event_handler_after_cb, + .hook_api_settings = hook_api_settings_cb, +}; + +/****************************************************************************** + * section: hooks for tracing daemon interface (export) + *****************************************************************************/ + +#define _HOOK_API_2_(flag,func,...) \ + struct afb_hook_api *hook; \ + struct afb_hookid hookid; \ + const char *apiname = afb_export_apiname(export); \ + pthread_rwlock_rdlock(&rwlock); \ + init_hookid(&hookid); \ + hook = list_of_api_hooks; \ + while (hook) { \ + if (hook->refcount \ + && hook->itf->hook_api_##func \ + && (hook->flags & afb_hook_flag_api_##flag) != 0 \ + && MATCH_API(hook->api, apiname)) { \ + hook->itf->hook_api_##func(hook->closure, &hookid, __VA_ARGS__); \ + } \ + hook = hook->next; \ + } \ + pthread_rwlock_unlock(&rwlock); + +#define _HOOK_API_(what,...) _HOOK_API_2_(what,what,__VA_ARGS__) + +void afb_hook_api_event_broadcast_before(const struct afb_export *export, const char *name, struct json_object *object) +{ + _HOOK_API_2_(event_broadcast, event_broadcast_before, export, name, object); +} + +int afb_hook_api_event_broadcast_after(const struct afb_export *export, const char *name, struct json_object *object, int result) +{ + _HOOK_API_2_(event_broadcast, event_broadcast_after, export, name, object, result); + return result; +} + +struct sd_event *afb_hook_api_get_event_loop(const struct afb_export *export, struct sd_event *result) +{ + _HOOK_API_(get_event_loop, export, result); + return result; +} + +struct sd_bus *afb_hook_api_get_user_bus(const struct afb_export *export, struct sd_bus *result) +{ + _HOOK_API_(get_user_bus, export, result); + return result; +} + +struct sd_bus *afb_hook_api_get_system_bus(const struct afb_export *export, struct sd_bus *result) +{ + _HOOK_API_(get_system_bus, export, result); + return result; +} + +void afb_hook_api_vverbose(const struct afb_export *export, int level, const char *file, int line, const char *function, const char *fmt, va_list args) +{ + _HOOK_API_(vverbose, export, level, file, line, function, fmt, args); +} + +struct afb_event_x2 *afb_hook_api_event_make(const struct afb_export *export, const char *name, struct afb_event_x2 *result) +{ + _HOOK_API_(event_make, export, name, result); + return result; +} + +int afb_hook_api_rootdir_get_fd(const struct afb_export *export, int result) +{ + _HOOK_API_(rootdir_get_fd, export, result); + return result; +} + +int afb_hook_api_rootdir_open_locale(const struct afb_export *export, const char *filename, int flags, const char *locale, int result) +{ + _HOOK_API_(rootdir_open_locale, export, filename, flags, locale, result); + return result; +} + +int afb_hook_api_queue_job(const struct afb_export *export, void (*callback)(int signum, void *arg), void *argument, void *group, int timeout, int result) +{ + _HOOK_API_(queue_job, export, callback, argument, group, timeout, result); + return result; +} + +void afb_hook_api_legacy_unstore_req(const struct afb_export *export, struct afb_stored_req *sreq) +{ + _HOOK_API_(legacy_unstore_req, export, sreq); +} + +void afb_hook_api_require_api(const struct afb_export *export, const char *name, int initialized) +{ + _HOOK_API_(require_api, export, name, initialized); +} + +int afb_hook_api_require_api_result(const struct afb_export *export, const char *name, int initialized, int result) +{ + _HOOK_API_2_(require_api, require_api_result, export, name, initialized, result); + return result; +} + +int afb_hook_api_add_alias(const struct afb_export *export, const char *api, const char *alias, int result) +{ + _HOOK_API_(add_alias, export, api, alias, result); + return result; +} + +void afb_hook_api_start_before(const struct afb_export *export) +{ + _HOOK_API_2_(start, start_before, export); +} + +int afb_hook_api_start_after(const struct afb_export *export, int status) +{ + _HOOK_API_2_(start, start_after, export, status); + return status; +} + +void afb_hook_api_on_event_before(const struct afb_export *export, const char *event, int event_x2, struct json_object *object) +{ + _HOOK_API_2_(on_event, on_event_before, export, event, event_x2, object); +} + +void afb_hook_api_on_event_after(const struct afb_export *export, const char *event, int event_x2, struct json_object *object) +{ + _HOOK_API_2_(on_event, on_event_after, export, event, event_x2, object); +} + +void afb_hook_api_call(const struct afb_export *export, const char *api, const char *verb, struct json_object *args) +{ + _HOOK_API_(call, export, api, verb, args); +} + +void afb_hook_api_call_result(const struct afb_export *export, struct json_object *object, const char*error, const char *info) +{ + _HOOK_API_2_(call, call_result, export, object, error, info); + +} + +void afb_hook_api_callsync(const struct afb_export *export, const char *api, const char *verb, struct json_object *args) +{ + _HOOK_API_(callsync, export, api, verb, args); +} + +int afb_hook_api_callsync_result(const struct afb_export *export, int status, struct json_object *object, const char *error, const char *info) +{ + _HOOK_API_2_(callsync, callsync_result, export, status, object, error, info); + return status; +} + +void afb_hook_api_new_api_before(const struct afb_export *export, const char *api, const char *info, int noconcurrency) +{ + _HOOK_API_2_(new_api, new_api_before, export, api, info, noconcurrency); +} + +int afb_hook_api_new_api_after(const struct afb_export *export, int result, const char *api) +{ + _HOOK_API_2_(new_api, new_api_after, export, result, api); + return result; +} + +int afb_hook_api_api_set_verbs_v2(const struct afb_export *export, int result, const struct afb_verb_v2 *verbs) +{ + _HOOK_API_2_(api_set_verbs, api_set_verbs_v2, export, result, verbs); + return result; +} + +int afb_hook_api_api_set_verbs_v3(const struct afb_export *export, int result, const struct afb_verb_v3 *verbs) +{ + _HOOK_API_2_(api_set_verbs, api_set_verbs_v3, export, result, verbs); + return result; +} + +int afb_hook_api_api_add_verb(const struct afb_export *export, int result, const char *verb, const char *info, int glob) +{ + _HOOK_API_(api_add_verb, export, result, verb, info, glob); + return result; +} + +int afb_hook_api_api_del_verb(const struct afb_export *export, int result, const char *verb) +{ + _HOOK_API_(api_del_verb, export, result, verb); + return result; +} + +int afb_hook_api_api_set_on_event(const struct afb_export *export, int result) +{ + _HOOK_API_(api_set_on_event, export, result); + return result; +} + +int afb_hook_api_api_set_on_init(const struct afb_export *export, int result) +{ + _HOOK_API_(api_set_on_init, export, result); + return result; +} + +void afb_hook_api_api_seal(const struct afb_export *export) +{ + _HOOK_API_(api_seal, export); +} + +int afb_hook_api_event_handler_add(const struct afb_export *export, int result, const char *pattern) +{ + _HOOK_API_(event_handler_add, export, result, pattern); + return result; +} +int afb_hook_api_event_handler_del(const struct afb_export *export, int result, const char *pattern) +{ + _HOOK_API_(event_handler_del, export, result, pattern); + return result; +} +int afb_hook_api_class_provide(const struct afb_export *export, int result, const char *name) +{ + _HOOK_API_(class_provide, export, result, name); + return result; +} +int afb_hook_api_class_require(const struct afb_export *export, int result, const char *name) +{ + _HOOK_API_(class_require, export, result, name); + return result; +} + +int afb_hook_api_delete_api(const struct afb_export *export, int result) +{ + _HOOK_API_(delete_api, export, result); + return result; +} + +void afb_hook_api_on_event_handler_before(const struct afb_export *export, const char *event, int event_x2, struct json_object *object, const char *pattern) +{ + _HOOK_API_2_(on_event_handler, on_event_handler_before, export, event, event_x2, object, pattern); +} + +void afb_hook_api_on_event_handler_after(const struct afb_export *export, const char *event, int event_x2, struct json_object *object, const char *pattern) +{ + _HOOK_API_2_(on_event_handler, on_event_handler_after, export, event, event_x2, object, pattern); +} + +struct json_object *afb_hook_api_settings(const struct afb_export *export, struct json_object *object) +{ + _HOOK_API_(settings, export, object); + return object; +} + +/****************************************************************************** + * section: hooking export + *****************************************************************************/ + +int afb_hook_flags_api(const char *api) +{ + int flags; + struct afb_hook_api *hook; + + flags = 0; + pthread_rwlock_rdlock(&rwlock); + hook = list_of_api_hooks; + while (hook) { + if (!api || MATCH_API(hook->api, api)) + flags |= hook->flags; + hook = hook->next; + } + pthread_rwlock_unlock(&rwlock); + return flags; +} + +struct afb_hook_api *afb_hook_create_api(const char *api, int flags, struct afb_hook_api_itf *itf, void *closure) +{ + struct afb_hook_api *hook; + + /* alloc the result */ + hook = calloc(1, sizeof *hook); + if (hook == NULL) + return NULL; + + /* get a copy of the names */ + hook->api = api ? strdup(api) : NULL; + if (api && !hook->api) { + free(hook); + return NULL; + } + + /* initialise the rest */ + hook->refcount = 1; + hook->flags = flags; + hook->itf = itf ? itf : &hook_api_default_itf; + hook->closure = closure; + + /* record the hook */ + pthread_mutex_lock(&mutex); + hook->next = list_of_api_hooks; + list_of_api_hooks = hook; + pthread_mutex_unlock(&mutex); + + /* returns it */ + return hook; +} + +struct afb_hook_api *afb_hook_addref_api(struct afb_hook_api *hook) +{ + __atomic_add_fetch(&hook->refcount, 1, __ATOMIC_RELAXED); + return hook; +} + +static void hook_clean_api() +{ + struct afb_hook_api **prv, *hook, *head; + + if (pthread_rwlock_trywrlock(&rwlock) == 0) { + /* unlink under mutex */ + head = NULL; + pthread_mutex_lock(&mutex); + prv = &list_of_api_hooks; + while ((hook = *prv)) { + if (hook->refcount) + prv = &(*prv)->next; + else { + *prv = hook->next; + hook->next = head; + head = hook; + } + } + pthread_mutex_unlock(&mutex); + pthread_rwlock_unlock(&rwlock); + + /* free found hooks */ + while((hook = head)) { + head = hook->next; + free(hook->api); + free(hook); + } + } +} + +void afb_hook_unref_api(struct afb_hook_api *hook) +{ + if (hook && !__atomic_sub_fetch(&hook->refcount, 1, __ATOMIC_RELAXED)) + hook_clean_api(); +} + +/****************************************************************************** + * section: default callbacks for tracing service interface (evt) + *****************************************************************************/ + +static void _hook_evt_(const char *evt, int id, const char *format, ...) +{ + va_list ap; + va_start(ap, format); + _hook_("evt-%s:%d", format, ap, evt, id); + va_end(ap); +} + +static void hook_evt_create_cb(void *closure, const struct afb_hookid *hookid, const char *evt, int id) +{ + _hook_evt_(evt, id, "create"); +} + +static void hook_evt_push_before_cb(void *closure, const struct afb_hookid *hookid, const char *evt, int id, struct json_object *obj) +{ + _hook_evt_(evt, id, "push.before(%s)", json_object_to_json_string_ext(obj, JSON_C_TO_STRING_NOSLASHESCAPE)); +} + + +static void hook_evt_push_after_cb(void *closure, const struct afb_hookid *hookid, const char *evt, int id, struct json_object *obj, int result) +{ + _hook_evt_(evt, id, "push.after(%s) -> %d", json_object_to_json_string_ext(obj, JSON_C_TO_STRING_NOSLASHESCAPE), result); +} + +static void hook_evt_broadcast_before_cb(void *closure, const struct afb_hookid *hookid, const char *evt, int id, struct json_object *obj) +{ + _hook_evt_(evt, id, "broadcast.before(%s)", json_object_to_json_string_ext(obj, JSON_C_TO_STRING_NOSLASHESCAPE)); +} + +static void hook_evt_broadcast_after_cb(void *closure, const struct afb_hookid *hookid, const char *evt, int id, struct json_object *obj, int result) +{ + _hook_evt_(evt, id, "broadcast.after(%s) -> %d", json_object_to_json_string_ext(obj, JSON_C_TO_STRING_NOSLASHESCAPE), result); +} + +static void hook_evt_name_cb(void *closure, const struct afb_hookid *hookid, const char *evt, int id, const char *result) +{ + _hook_evt_(evt, id, "name -> %s", result); +} + +static void hook_evt_addref_cb(void *closure, const struct afb_hookid *hookid, const char *evt, int id) +{ + _hook_evt_(evt, id, "addref"); +} + +static void hook_evt_unref_cb(void *closure, const struct afb_hookid *hookid, const char *evt, int id) +{ + _hook_evt_(evt, id, "unref"); +} + +static struct afb_hook_evt_itf hook_evt_default_itf = { + .hook_evt_create = hook_evt_create_cb, + .hook_evt_push_before = hook_evt_push_before_cb, + .hook_evt_push_after = hook_evt_push_after_cb, + .hook_evt_broadcast_before = hook_evt_broadcast_before_cb, + .hook_evt_broadcast_after = hook_evt_broadcast_after_cb, + .hook_evt_name = hook_evt_name_cb, + .hook_evt_addref = hook_evt_addref_cb, + .hook_evt_unref = hook_evt_unref_cb +}; + +/****************************************************************************** + * section: hooks for tracing events interface (evt) + *****************************************************************************/ + +#define _HOOK_EVT_(what,...) \ + struct afb_hook_evt *hook; \ + struct afb_hookid hookid; \ + pthread_rwlock_rdlock(&rwlock); \ + init_hookid(&hookid); \ + hook = list_of_evt_hooks; \ + while (hook) { \ + if (hook->refcount \ + && hook->itf->hook_evt_##what \ + && (hook->flags & afb_hook_flag_evt_##what) != 0 \ + && MATCH_EVENT(hook->pattern, evt)) { \ + hook->itf->hook_evt_##what(hook->closure, &hookid, __VA_ARGS__); \ + } \ + hook = hook->next; \ + } \ + pthread_rwlock_unlock(&rwlock); + +void afb_hook_evt_create(const char *evt, int id) +{ + _HOOK_EVT_(create, evt, id); +} + +void afb_hook_evt_push_before(const char *evt, int id, struct json_object *obj) +{ + _HOOK_EVT_(push_before, evt, id, obj); +} + +int afb_hook_evt_push_after(const char *evt, int id, struct json_object *obj, int result) +{ + _HOOK_EVT_(push_after, evt, id, obj, result); + return result; +} + +void afb_hook_evt_broadcast_before(const char *evt, int id, struct json_object *obj) +{ + _HOOK_EVT_(broadcast_before, evt, id, obj); +} + +int afb_hook_evt_broadcast_after(const char *evt, int id, struct json_object *obj, int result) +{ + _HOOK_EVT_(broadcast_after, evt, id, obj, result); + return result; +} + +void afb_hook_evt_name(const char *evt, int id, const char *result) +{ + _HOOK_EVT_(name, evt, id, result); +} + +void afb_hook_evt_addref(const char *evt, int id) +{ + _HOOK_EVT_(addref, evt, id); +} + +void afb_hook_evt_unref(const char *evt, int id) +{ + _HOOK_EVT_(unref, evt, id); +} + +/****************************************************************************** + * section: hooking services (evt) + *****************************************************************************/ + +int afb_hook_flags_evt(const char *name) +{ + int flags; + struct afb_hook_evt *hook; + + flags = 0; + pthread_rwlock_rdlock(&rwlock); + hook = list_of_evt_hooks; + while (hook) { + if (!name || MATCH_EVENT(hook->pattern, name)) + flags |= hook->flags; + hook = hook->next; + } + pthread_rwlock_unlock(&rwlock); + return flags; +} + +struct afb_hook_evt *afb_hook_create_evt(const char *pattern, int flags, struct afb_hook_evt_itf *itf, void *closure) +{ + struct afb_hook_evt *hook; + + /* alloc the result */ + hook = calloc(1, sizeof *hook); + if (hook == NULL) + return NULL; + + /* get a copy of the names */ + hook->pattern = pattern ? strdup(pattern) : NULL; + if (pattern && !hook->pattern) { + free(hook); + return NULL; + } + + /* initialise the rest */ + hook->refcount = 1; + hook->flags = flags; + hook->itf = itf ? itf : &hook_evt_default_itf; + hook->closure = closure; + + /* record the hook */ + pthread_mutex_lock(&mutex); + hook->next = list_of_evt_hooks; + list_of_evt_hooks = hook; + pthread_mutex_unlock(&mutex); + + /* returns it */ + return hook; +} + +struct afb_hook_evt *afb_hook_addref_evt(struct afb_hook_evt *hook) +{ + __atomic_add_fetch(&hook->refcount, 1, __ATOMIC_RELAXED); + return hook; +} + +static void hook_clean_evt() +{ + struct afb_hook_evt **prv, *hook, *head; + + if (pthread_rwlock_trywrlock(&rwlock) == 0) { + /* unlink under mutex */ + head = NULL; + pthread_mutex_lock(&mutex); + prv = &list_of_evt_hooks; + while ((hook = *prv)) { + if (hook->refcount) + prv = &(*prv)->next; + else { + *prv = hook->next; + hook->next = head; + head = hook; + } + } + pthread_mutex_unlock(&mutex); + pthread_rwlock_unlock(&rwlock); + + /* free found hooks */ + while((hook = head)) { + head = hook->next; + free(hook->pattern); + free(hook); + } + } +} + +void afb_hook_unref_evt(struct afb_hook_evt *hook) +{ + if (hook && !__atomic_sub_fetch(&hook->refcount, 1, __ATOMIC_RELAXED)) + hook_clean_evt(); +} + +/****************************************************************************** + * section: default callbacks for sessions (session) + *****************************************************************************/ + +static void _hook_session_(struct afb_session *session, const char *format, ...) +{ + va_list ap; + va_start(ap, format); + _hook_("session-%s", format, ap, afb_session_uuid(session)); + va_end(ap); +} + +static void hook_session_create_cb(void *closure, const struct afb_hookid *hookid, struct afb_session *session) +{ + _hook_session_(session, "create"); +} + +static void hook_session_close_cb(void *closure, const struct afb_hookid *hookid, struct afb_session *session) +{ + _hook_session_(session, "close"); +} + +static void hook_session_destroy_cb(void *closure, const struct afb_hookid *hookid, struct afb_session *session) +{ + _hook_session_(session, "destroy"); +} + +static void hook_session_addref_cb(void *closure, const struct afb_hookid *hookid, struct afb_session *session) +{ + _hook_session_(session, "addref"); +} + +static void hook_session_unref_cb(void *closure, const struct afb_hookid *hookid, struct afb_session *session) +{ + _hook_session_(session, "unref"); +} + +static struct afb_hook_session_itf hook_session_default_itf = { + .hook_session_create = hook_session_create_cb, + .hook_session_close = hook_session_close_cb, + .hook_session_destroy = hook_session_destroy_cb, + .hook_session_addref = hook_session_addref_cb, + .hook_session_unref = hook_session_unref_cb +}; + +/****************************************************************************** + * section: hooks for tracing sessions (session) + *****************************************************************************/ + +#define _HOOK_SESSION_(what,...) \ + struct afb_hook_session *hook; \ + struct afb_hookid hookid; \ + const char *sessid = 0; \ + pthread_rwlock_rdlock(&rwlock); \ + init_hookid(&hookid); \ + hook = list_of_session_hooks; \ + while (hook) { \ + if (hook->refcount \ + && hook->itf->hook_session_##what \ + && (hook->flags & afb_hook_flag_session_##what) != 0 \ + && MATCH_SESSION(hook->pattern, (sessid?:(sessid=afb_session_uuid(session))))) { \ + hook->itf->hook_session_##what(hook->closure, &hookid, __VA_ARGS__); \ + } \ + hook = hook->next; \ + } \ + pthread_rwlock_unlock(&rwlock); + +void afb_hook_session_create(struct afb_session *session) +{ + _HOOK_SESSION_(create, session); +} + +void afb_hook_session_close(struct afb_session *session) +{ + _HOOK_SESSION_(close, session); +} + +void afb_hook_session_destroy(struct afb_session *session) +{ + _HOOK_SESSION_(destroy, session); +} + +void afb_hook_session_addref(struct afb_session *session) +{ + _HOOK_SESSION_(addref, session); +} + +void afb_hook_session_unref(struct afb_session *session) +{ + _HOOK_SESSION_(unref, session); +} + + +/****************************************************************************** + * section: hooking sessions (session) + *****************************************************************************/ + +struct afb_hook_session *afb_hook_create_session(const char *pattern, int flags, struct afb_hook_session_itf *itf, void *closure) +{ + struct afb_hook_session *hook; + + /* alloc the result */ + hook = calloc(1, sizeof *hook); + if (hook == NULL) + return NULL; + + /* get a copy of the names */ + hook->pattern = pattern ? strdup(pattern) : NULL; + if (pattern && !hook->pattern) { + free(hook); + return NULL; + } + + /* initialise the rest */ + hook->refcount = 1; + hook->flags = flags; + hook->itf = itf ? itf : &hook_session_default_itf; + hook->closure = closure; + + /* record the hook */ + pthread_mutex_lock(&mutex); + hook->next = list_of_session_hooks; + list_of_session_hooks = hook; + pthread_mutex_unlock(&mutex); + + /* returns it */ + return hook; +} + +struct afb_hook_session *afb_hook_addref_session(struct afb_hook_session *hook) +{ + __atomic_add_fetch(&hook->refcount, 1, __ATOMIC_RELAXED); + return hook; +} + +static void hook_clean_session() +{ + struct afb_hook_session **prv, *hook, *head; + + if (pthread_rwlock_trywrlock(&rwlock) == 0) { + /* unlink under mutex */ + head = NULL; + pthread_mutex_lock(&mutex); + prv = &list_of_session_hooks; + while ((hook = *prv)) { + if (hook->refcount) + prv = &(*prv)->next; + else { + *prv = hook->next; + hook->next = head; + head = hook; + } + } + pthread_mutex_unlock(&mutex); + pthread_rwlock_unlock(&rwlock); + + /* free found hooks */ + while((hook = head)) { + head = hook->next; + free(hook->pattern); + free(hook); + } + } +} + +void afb_hook_unref_session(struct afb_hook_session *hook) +{ + if (hook && !__atomic_sub_fetch(&hook->refcount, 1, __ATOMIC_RELAXED)) + hook_clean_session(); +} + +/****************************************************************************** + * section: default callbacks for globals (global) + *****************************************************************************/ + +static void _hook_global_(const char *format, ...) +{ + va_list ap; + va_start(ap, format); + _hook_("global", format, ap); + va_end(ap); +} + +static void hook_global_vverbose_cb(void *closure, const struct afb_hookid *hookid, int level, const char *file, int line, const char *func, const char *fmt, va_list args) +{ + int len; + char *msg; + va_list ap; + + va_copy(ap, args); + len = vasprintf(&msg, fmt, ap); + va_end(ap); + + if (len < 0) + _hook_global_("vverbose(%d:%s, %s, %d, %s) -> %s ? ? ?", level, verbose_name_of_level(level), file, line, func, fmt); + else { + _hook_global_("vverbose(%d:%s, %s, %d, %s) -> %s", level, verbose_name_of_level(level), file, line, func, msg); + free(msg); + } +} + +static struct afb_hook_global_itf hook_global_default_itf = { + .hook_global_vverbose = hook_global_vverbose_cb +}; + +/****************************************************************************** + * section: hooks for tracing globals (global) + *****************************************************************************/ + +#define _HOOK_GLOBAL_(what,...) \ + struct afb_hook_global *hook; \ + struct afb_hookid hookid; \ + pthread_rwlock_rdlock(&rwlock); \ + init_hookid(&hookid); \ + hook = list_of_global_hooks; \ + while (hook) { \ + if (hook->refcount \ + && hook->itf->hook_global_##what \ + && (hook->flags & afb_hook_flag_global_##what) != 0) { \ + hook->itf->hook_global_##what(hook->closure, &hookid, __VA_ARGS__); \ + } \ + hook = hook->next; \ + } \ + pthread_rwlock_unlock(&rwlock); + +static void afb_hook_global_vverbose(int level, const char *file, int line, const char *func, const char *fmt, va_list args) +{ + _HOOK_GLOBAL_(vverbose, level, file ?: "?", line, func ?: "?", fmt ?: "", args); +} + +/****************************************************************************** + * section: hooking globals (global) + *****************************************************************************/ + +static void update_global() +{ + struct afb_hook_global *hook; + int flags = 0; + + pthread_rwlock_rdlock(&rwlock); + hook = list_of_global_hooks; + while (hook) { + if (hook->refcount) + flags = hook->flags; + hook = hook->next; + } + verbose_observer = (flags & afb_hook_flag_global_vverbose) ? afb_hook_global_vverbose : NULL; + pthread_rwlock_unlock(&rwlock); +} + +struct afb_hook_global *afb_hook_create_global(int flags, struct afb_hook_global_itf *itf, void *closure) +{ + struct afb_hook_global *hook; + + /* alloc the result */ + hook = calloc(1, sizeof *hook); + if (hook == NULL) + return NULL; + + /* initialise the rest */ + hook->refcount = 1; + hook->flags = flags; + hook->itf = itf ? itf : &hook_global_default_itf; + hook->closure = closure; + + /* record the hook */ + pthread_mutex_lock(&mutex); + hook->next = list_of_global_hooks; + list_of_global_hooks = hook; + pthread_mutex_unlock(&mutex); + + /* update hooking */ + update_global(); + + /* returns it */ + return hook; +} + +struct afb_hook_global *afb_hook_addref_global(struct afb_hook_global *hook) +{ + __atomic_add_fetch(&hook->refcount, 1, __ATOMIC_RELAXED); + return hook; +} + +static void hook_clean_global() +{ + struct afb_hook_global **prv, *hook, *head; + + if (pthread_rwlock_trywrlock(&rwlock) == 0) { + /* unlink under mutex */ + head = NULL; + pthread_mutex_lock(&mutex); + prv = &list_of_global_hooks; + while ((hook = *prv)) { + if (hook->refcount) + prv = &(*prv)->next; + else { + *prv = hook->next; + hook->next = head; + head = hook; + } + } + pthread_mutex_unlock(&mutex); + pthread_rwlock_unlock(&rwlock); + + /* free found hooks */ + while((hook = head)) { + head = hook->next; + free(hook); + } + } +} + +void afb_hook_unref_global(struct afb_hook_global *hook) +{ + if (hook && !__atomic_sub_fetch(&hook->refcount, 1, __ATOMIC_RELAXED)) { + /* update hooking */ + update_global(); + hook_clean_global(); + } +} + +#endif /* WITH_AFB_HOOK *******************************************************/