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/* Copyright (C) 2007-2011 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \file
*
* \author Victor Julien <victor@inliniac.net>
* \author Gurvinder Singh <gurvindersinghdahiya@gmail.com>
* \author Pablo Rincon <pablo.rincon.crespo@gmail.com>
* \author Brian Rectanus <brectanu@gmail.com>
*
* This file provides a HTTP protocol support for the engine using HTP library.
*/
#include "suricata-common.h"
#include "app-layer-htp.h"
#include "app-layer-htp-mem.h"
#include "app-layer-htp-body.h"
#include "util-streaming-buffer.h"
#include "util-print.h"
extern StreamingBufferConfig htp_sbcfg;
/**
* \brief Append a chunk of body to the HtpBody struct
*
* \param body pointer to the HtpBody holding the list
* \param data pointer to the data of the chunk
* \param len length of the chunk pointed by data
*
* \retval 0 ok
* \retval -1 error
*/
int HtpBodyAppendChunk(const HTPCfgDir *hcfg, HtpBody *body,
const uint8_t *data, uint32_t len)
{
SCEnter();
HtpBodyChunk *bd = NULL;
if (len == 0 || data == NULL) {
SCReturnInt(0);
}
if (body->sb == NULL) {
body->sb = StreamingBufferInit(&htp_sbcfg);
if (body->sb == NULL)
SCReturnInt(-1);
}
/* New chunk */
bd = (HtpBodyChunk *)HTPCalloc(1, sizeof(HtpBodyChunk));
if (bd == NULL) {
SCReturnInt(-1);
}
if (StreamingBufferAppend(body->sb, &htp_sbcfg, &bd->sbseg, data, len) != 0) {
HTPFree(bd, sizeof(HtpBodyChunk));
SCReturnInt(-1);
}
if (body->first == NULL) {
body->first = body->last = bd;
} else {
body->last->next = bd;
body->last = bd;
}
body->content_len_so_far += len;
SCLogDebug("body %p", body);
SCReturnInt(0);
}
/**
* \brief Print the information and chunks of a Body
* \param body pointer to the HtpBody holding the list
* \retval none
*/
void HtpBodyPrint(HtpBody *body)
{
if (SCLogDebugEnabled()||1) {
SCEnter();
if (body->first == NULL)
return;
HtpBodyChunk *cur = NULL;
SCLogDebug("--- Start body chunks at %p ---", body);
printf("--- Start body chunks at %p ---\n", body);
for (cur = body->first; cur != NULL; cur = cur->next) {
const uint8_t *data = NULL;
uint32_t data_len = 0;
StreamingBufferSegmentGetData(body->sb, &cur->sbseg, &data, &data_len);
SCLogDebug("Body %p; data %p, len %"PRIu32, body, data, data_len);
printf("Body %p; data %p, len %"PRIu32"\n", body, data, data_len);
PrintRawDataFp(stdout, data, data_len);
}
SCLogDebug("--- End body chunks at %p ---", body);
}
}
/**
* \brief Free the information held in the request body
* \param body pointer to the HtpBody holding the list
* \retval none
*/
void HtpBodyFree(const HTPCfgDir *hcfg, HtpBody *body)
{
SCEnter();
SCLogDebug("removing chunks of body %p", body);
HtpBodyChunk *cur = NULL;
HtpBodyChunk *prev = NULL;
prev = body->first;
while (prev != NULL) {
cur = prev->next;
HTPFree(prev, sizeof(HtpBodyChunk));
prev = cur;
}
body->first = body->last = NULL;
StreamingBufferFree(body->sb, &htp_sbcfg);
}
/**
* \brief Free request body chunks that are already fully parsed.
*
* \param state htp_state, with reference to our config
* \param body the body to prune
* \param direction STREAM_TOSERVER (request), STREAM_TOCLIENT (response)
*
* \retval none
*/
void HtpBodyPrune(HtpState *state, HtpBody *body, int direction)
{
SCEnter();
if (body == NULL || body->first == NULL) {
SCReturn;
}
if (body->body_parsed == 0) {
SCReturn;
}
const HTPCfgDir *cfg =
(direction == STREAM_TOCLIENT) ? &state->cfg->response : &state->cfg->request;
uint32_t min_size = cfg->inspect_min_size;
uint32_t window = cfg->inspect_window;
uint64_t max_window = ((min_size > window) ? min_size : window);
uint64_t in_flight = body->content_len_so_far - body->body_inspected;
/* Special case. If body_inspected is not being updated, we make sure that
* we prune the body. We allow for some extra size/room as we may be called
* multiple times on uninspected body chunk additions if a large block of
* data was ack'd at once. Want to avoid pruning before inspection. */
if (in_flight > (max_window * 3)) {
body->body_inspected = body->content_len_so_far - max_window;
} else if (body->body_inspected < max_window) {
SCReturn;
}
uint64_t left_edge = body->body_inspected;
if (left_edge <= min_size || left_edge <= window)
left_edge = 0;
if (left_edge)
left_edge -= window;
if (left_edge) {
SCLogDebug("sliding body to offset %"PRIu64, left_edge);
StreamingBufferSlideToOffset(body->sb, &htp_sbcfg, left_edge);
}
SCLogDebug("pruning chunks of body %p", body);
HtpBodyChunk *cur = body->first;
while (cur != NULL) {
HtpBodyChunk *next = cur->next;
SCLogDebug("cur %p", cur);
if (!StreamingBufferSegmentIsBeforeWindow(body->sb, &cur->sbseg)) {
SCLogDebug("not removed");
break;
}
body->first = next;
if (body->last == cur) {
body->last = next;
}
HTPFree(cur, sizeof(HtpBodyChunk));
cur = next;
SCLogDebug("removed");
}
SCReturn;
}
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