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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"
typedef struct private_set_length_t private_set_length_t;
/**
* Private data of an set_length_t object.
*/
struct private_set_length_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;
/**
* Difference to correct length
*/
int diff;
};
METHOD(listener_t, message, bool,
private_set_length_t *this, ike_sa_t *ike_sa, message_t *message,
bool incoming, bool plain)
{
if (!incoming && plain &&
message->get_request(message) == this->req &&
message->get_message_id(message) == this->id)
{
payload_t *payload;
enumerator_t *enumerator;
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;
}
}
enumerator = message->create_payload_enumerator(message);
while (enumerator->enumerate(enumerator, &payload))
{
if (type == payload->get_type(payload))
{
encoding_rule_t *rules;
u_int16_t *len;
int i, count;
count = payload->get_encoding_rules(payload, &rules);
for (i = 0; i < count; i++)
{
if (rules[i].type == PAYLOAD_LENGTH)
{
len = (u_int16_t*)(((void*)payload) + rules[i].offset);
DBG1(DBG_CFG, "adjusting length of %N payload "
"from %d to %d", payload_type_short_names, type,
*len, *len + this->diff);
*len = *len + this->diff;
}
}
}
}
enumerator->destroy(enumerator);
}
return TRUE;
}
METHOD(hook_t, destroy, void,
private_set_length_t *this)
{
free(this);
}
/**
* Create the IKE_AUTH fill hook
*/
hook_t *set_length_hook_create(char *name)
{
private_set_length_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),
.diff = conftest->test->get_int(conftest->test,
"hooks.%s.diff", 0, name),
);
return &this->hook;
}
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