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/* Copyright (C) 2020-2021 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.
*/
/**
* \ingroup decode
*
* @{
*/
/**
* \file
*
* \author Victor Julien <victor@inliniac.net>
*
* Decode Cisco HDLC
*/
#include "suricata-common.h"
#include "decode.h"
#include "decode-chdlc.h"
#include "decode-events.h"
#include "util-validate.h"
#include "util-unittest.h"
#include "util-debug.h"
int DecodeCHDLC(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p,
const uint8_t *pkt, uint32_t len)
{
DEBUG_VALIDATE_BUG_ON(pkt == NULL);
StatsIncr(tv, dtv->counter_chdlc);
if (unlikely(len < CHDLC_HEADER_LEN)) {
ENGINE_SET_INVALID_EVENT(p, CHDLC_PKT_TOO_SMALL);
return TM_ECODE_FAILED;
}
if (unlikely(len > CHDLC_HEADER_LEN + USHRT_MAX)) {
return TM_ECODE_FAILED;
}
if (!PacketIncreaseCheckLayers(p)) {
return TM_ECODE_FAILED;
}
CHDLCHdr *hdr = (CHDLCHdr *)pkt;
SCLogDebug("p %p pkt %p ether type %04x", p, pkt, SCNtohs(hdr->protocol));
DecodeNetworkLayer(tv, dtv, SCNtohs(hdr->protocol), p,
pkt + CHDLC_HEADER_LEN, len - CHDLC_HEADER_LEN);
return TM_ECODE_OK;
}
#ifdef UNITTESTS
static int DecodeCHDLCTest01 (void)
{
uint8_t raw[] = { 0x0f,0x00,0x08,0x00, // HDLC
0x45,0x00,0x00,0x30,0x15,0x5a,0x40,0x00,0x80,0x06,
0x6c,0xd0,0xc0,0xa8,0x02,0x07,0x41,0x37,0x74,0xb7,
0x13,0x4a,0x00,0x50,0x9c,0x34,0x09,0x6c,0x00,0x00,
0x00,0x00,0x70,0x02,0x40,0x00,0x11,0x47,0x00,0x00,
0x02,0x04,0x05,0xb4,0x01,0x01,0x04,0x02 };
Packet *p = PacketGetFromAlloc();
FAIL_IF_NULL(p);
ThreadVars tv;
DecodeThreadVars dtv;
memset(&dtv, 0, sizeof(DecodeThreadVars));
memset(&tv, 0, sizeof(ThreadVars));
DecodeCHDLC(&tv, &dtv, p, raw, sizeof(raw));
FAIL_IF_NOT(PKT_IS_IPV4(p));
FAIL_IF_NOT(PKT_IS_TCP(p));
FAIL_IF_NOT(p->dp == 80);
SCFree(p);
PASS;
}
#endif /* UNITTESTS */
/**
* \brief Registers Ethernet unit tests
* \todo More Ethernet tests
*/
void DecodeCHDLCRegisterTests(void)
{
#ifdef UNITTESTS
UtRegisterTest("DecodeCHDLCTest01", DecodeCHDLCTest01);
#endif /* UNITTESTS */
}
/**
* @}
*/
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