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/***************************************************************************
* Copyright (c) 2009-2010 Open Information Security Foundation
* Copyright (c) 2010-2013 Qualys, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - Neither the name of the Qualys, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
***************************************************************************/
/**
* @file
* @author Ivan Ristic <ivanr@webkreator.com>
*/
#include "htp_config_auto.h"
#include "htp_private.h"
htp_hook_t *htp_hook_copy(const htp_hook_t *hook) {
if (hook == NULL) return NULL;
htp_hook_t *copy = htp_hook_create();
if (copy == NULL) return NULL;
for (size_t i = 0, n = htp_list_size(hook->callbacks); i < n; i++) {
htp_callback_t *callback = htp_list_get(hook->callbacks, i);
if (htp_hook_register(©, callback->fn) != HTP_OK) {
htp_hook_destroy(copy);
return NULL;
}
}
return copy;
}
htp_hook_t *htp_hook_create(void) {
htp_hook_t *hook = calloc(1, sizeof (htp_hook_t));
if (hook == NULL) return NULL;
hook->callbacks = (htp_list_array_t *) htp_list_array_create(4);
if (hook->callbacks == NULL) {
free(hook);
return NULL;
}
return hook;
}
void htp_hook_destroy(htp_hook_t *hook) {
if (hook == NULL) return;
for (size_t i = 0, n = htp_list_size(hook->callbacks); i < n; i++) {
free((htp_callback_t *) htp_list_get(hook->callbacks, i));
}
htp_list_array_destroy(hook->callbacks);
free(hook);
}
htp_status_t htp_hook_register(htp_hook_t **hook, const htp_callback_fn_t callback_fn) {
if (hook == NULL) return HTP_ERROR;
htp_callback_t *callback = calloc(1, sizeof (htp_callback_t));
if (callback == NULL) return HTP_ERROR;
callback->fn = callback_fn;
// Create a new hook if one does not exist
int hook_created = 0;
if (*hook == NULL) {
hook_created = 1;
*hook = htp_hook_create();
if (*hook == NULL) {
free(callback);
return HTP_ERROR;
}
}
// Add callback
if (htp_list_array_push((*hook)->callbacks, callback) != HTP_OK) {
if (hook_created) {
free(*hook);
}
free(callback);
return HTP_ERROR;
}
return HTP_OK;
}
htp_status_t htp_hook_run_all(htp_hook_t *hook, void *user_data) {
if (hook == NULL) return HTP_OK;
// Loop through the registered callbacks, giving each a chance to run.
for (size_t i = 0, n = htp_list_size(hook->callbacks); i < n; i++) {
htp_callback_t *callback = htp_list_get(hook->callbacks, i);
htp_status_t rc = callback->fn(user_data);
// A hook can return HTP_OK to say that it did some work,
// or HTP_DECLINED to say that it did no work. Anything else
// is treated as an error.
if ((rc != HTP_OK) && (rc != HTP_DECLINED)) {
return rc;
}
}
return HTP_OK;
}
htp_status_t htp_hook_run_one(htp_hook_t *hook, void *user_data) {
if (hook == NULL) return HTP_DECLINED;
for (size_t i = 0, n = htp_list_size(hook->callbacks); i < n; i++) {
htp_callback_t *callback = htp_list_get(hook->callbacks, i);
htp_status_t rc = callback->fn(user_data);
// A hook can return HTP_DECLINED to say that it did no work,
// and we'll ignore that. If we see HTP_OK or anything else,
// we stop processing (because it was either a successful
// handling or an error).
if (rc != HTP_DECLINED) {
// Return HTP_OK or an error.
return rc;
}
}
// No hook wanted to process the callback.
return HTP_DECLINED;
}
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