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/*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "hook.h"
#include <encoding/payloads/unknown_payload.h>
typedef struct private_add_payload_t private_add_payload_t;
/**
* Private data of an add_payload_t object.
*/
struct private_add_payload_t {
/**
* Implements the hook_t interface.
*/
hook_t hook;
/**
* Alter requests or responses?
*/
bool req;
/**
* ID of message to alter.
*/
int id;
/**
* Payload type
*/
char *type;
/**
* Payload data
*/
char *data;
/**
* Set critical bit of the payload
*/
bool critical;
/**
* True to replace existing payload of this type
*/
bool replace;
};
METHOD(listener_t, message, bool,
private_add_payload_t *this, ike_sa_t *ike_sa, message_t *message,
bool incoming)
{
if (!incoming &&
message->get_request(message) == this->req &&
message->get_message_id(message) == this->id)
{
unknown_payload_t *unknown;
payload_t *payload;
enumerator_t *enumerator;
chunk_t data = chunk_empty;
payload_type_t type;
type = atoi(this->type);
if (!type)
{
type = enum_from_name(payload_type_short_names, this->type);
if (type == -1)
{
DBG1(DBG_CFG, "unknown payload: '%s', skipped", this->type);
return TRUE;
}
}
if (this->replace)
{
enumerator = message->create_payload_enumerator(message);
while (enumerator->enumerate(enumerator, &payload))
{
if (payload->get_type(payload) == type)
{
message->remove_payload_at(message, enumerator);
payload->destroy(payload);
break;
}
}
enumerator->destroy(enumerator);
}
if (strncaseeq(this->data, "0x", 2))
{
data = chunk_skip(chunk_create(this->data, strlen(this->data)), 2);
data = chunk_from_hex(data, NULL);
}
else if (this->data && strlen(this->data))
{
data = chunk_clone(chunk_create(this->data, strlen(this->data)));
}
unknown = unknown_payload_create_data(type, this->critical, data);
message->add_payload(message, &unknown->payload_interface);
}
return TRUE;
}
METHOD(hook_t, destroy, void,
private_add_payload_t *this)
{
free(this);
}
/**
* Create the IKE_AUTH fill hook
*/
hook_t *add_payload_hook_create(char *name)
{
private_add_payload_t *this;
INIT(this,
.hook = {
.listener = {
.message = _message,
},
.destroy = _destroy,
},
.req = conftest->test->get_bool(conftest->test,
"hooks.%s.request", TRUE, name),
.id = conftest->test->get_int(conftest->test,
"hooks.%s.id", 0, name),
.type = conftest->test->get_str(conftest->test,
"hooks.%s.type", "", name),
.data = conftest->test->get_str(conftest->test,
"hooks.%s.data", "", name),
.critical = conftest->test->get_bool(conftest->test,
"hooks.%s.critical", FALSE, name),
.replace = conftest->test->get_bool(conftest->test,
"hooks.%s.replace", FALSE, name),
);
return &this->hook;
}
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