decode-raw.c

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/* Copyright (C) 2007-2021 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 William Metcalf <william.metcalf@gmail.com>
 *
 * Decode RAW
 */
 
#include "suricata-common.h"
#include "decode.h"
#include "decode-raw.h"
#include "decode-events.h"
 
#include "util-validate.h"
#include "util-unittest.h"
#include "util-debug.h"
 
#include "pkt-var.h"
#include "util-profiling.h"
#include "host.h"
 
 
int DecodeRaw(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p,
        const uint8_t *pkt, uint32_t len)
{
    DEBUG_VALIDATE_BUG_ON(pkt == NULL);
 
    StatsIncr(tv, dtv->counter_raw);
 
    /* If it is ipv4 or ipv6 it should at least be the size of ipv4 */
    if (unlikely(len < IPV4_HEADER_LEN)) {
        ENGINE_SET_INVALID_EVENT(p, IPV4_PKT_TOO_SMALL);
        return TM_ECODE_FAILED;
    }
 
 
 
    if (IP_GET_RAW_VER(pkt) == 4) {
        if (unlikely(GET_PKT_LEN(p) > USHRT_MAX)) {
            return TM_ECODE_FAILED;
        }
        SCLogDebug("IPV4 Packet");
        DecodeIPV4(tv, dtv, p, GET_PKT_DATA(p), (uint16_t)(GET_PKT_LEN(p)));
    } else if (IP_GET_RAW_VER(pkt) == 6) {
        if (unlikely(GET_PKT_LEN(p) > USHRT_MAX)) {
            return TM_ECODE_FAILED;
        }
        SCLogDebug("IPV6 Packet");
        DecodeIPV6(tv, dtv, p, GET_PKT_DATA(p), (uint16_t)(GET_PKT_LEN(p)));
    } else {
        SCLogDebug("Unknown ip version %d", IP_GET_RAW_VER(pkt));
        ENGINE_SET_EVENT(p,IPRAW_INVALID_IPV);
    }
    return TM_ECODE_OK;
}
 
#ifdef UNITTESTS
#include "flow.h"
#include "flow-util.h"
 
/** DecodeRawtest01
 *  \brief Valid Raw packet
 *  \retval 0 Expected test value
 */
static int DecodeRawTest01 (void)
{
 
    /* IPV6/TCP/no eth header */
    uint8_t raw_ip[] = {
        0x60, 0x00, 0x00, 0x00, 0x00, 0x28, 0x06, 0x40,
        0x20, 0x01, 0x06, 0x18, 0x04, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x51, 0x99, 0xcc, 0x70,
        0x20, 0x01, 0x06, 0x18, 0x00, 0x01, 0x80, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05,
        0x8c, 0x9b, 0x00, 0x50, 0x6a, 0xe7, 0x07, 0x36,
        0x00, 0x00, 0x00, 0x00, 0xa0, 0x02, 0x16, 0x30,
        0x29, 0x9c, 0x00, 0x00, 0x02, 0x04, 0x05, 0x8c,
        0x04, 0x02, 0x08, 0x0a, 0x00, 0xdd, 0x1a, 0x39,
        0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x03, 0x02 };
    Packet *p = PacketGetFromAlloc();
    if (unlikely(p == NULL))
        return 0;
    ThreadVars tv;
    DecodeThreadVars dtv;
 
    memset(&dtv, 0, sizeof(DecodeThreadVars));
    memset(&tv,  0, sizeof(ThreadVars));
 
    if (PacketCopyData(p, raw_ip, sizeof(raw_ip)) == -1) {
    SCFree(p);
    return 0;
    }
 
    FlowInitConfig(FLOW_QUIET);
 
    DecodeRaw(&tv, &dtv, p, raw_ip, GET_PKT_LEN(p));
    if (p->ip6h == NULL) {
        printf("expected a valid ipv6 header but it was NULL: ");
        FlowShutdown();
        SCFree(p);
        return 0;
    }
 
    PACKET_RECYCLE(p);
    FlowShutdown();
    SCFree(p);
    return 1;
 
}
/** DecodeRawtest02
 *  \brief Valid Raw packet
 *  \retval 0 Expected test value
 */
static int DecodeRawTest02 (void)
{
 
    /* IPV4/TCP/no eth header */
    uint8_t raw_ip[] = {
        0x45, 0x00, 0x00, 0x30, 0x00, 0xad, 0x40, 0x00,
        0x7f, 0x06, 0xac, 0xc5, 0xc0, 0xa8, 0x67, 0x02,
        0xc0, 0xa8, 0x66, 0x02, 0x0b, 0xc7, 0x00, 0x50,
        0x1d, 0xb3, 0x12, 0x37, 0x00, 0x00, 0x00, 0x00,
        0x70, 0x02, 0x40, 0x00, 0xb8, 0xc8, 0x00, 0x00,
        0x02, 0x04, 0x05, 0xb4, 0x01, 0x01, 0x04, 0x02 };
 
    Packet *p = PacketGetFromAlloc();
    if (unlikely(p == NULL))
        return 0;
    ThreadVars tv;
    DecodeThreadVars dtv;
 
    memset(&dtv, 0, sizeof(DecodeThreadVars));
    memset(&tv,  0, sizeof(ThreadVars));
 
    if (PacketCopyData(p, raw_ip, sizeof(raw_ip)) == -1) {
    SCFree(p);
    return 0;
    }
 
    FlowInitConfig(FLOW_QUIET);
 
    DecodeRaw(&tv, &dtv, p, raw_ip, GET_PKT_LEN(p));
    if (p->ip4h == NULL) {
        printf("expected a valid ipv4 header but it was NULL: ");
        PACKET_RECYCLE(p);
        FlowShutdown();
        SCFree(p);
        return 0;
    }
 
    PACKET_RECYCLE(p);
    FlowShutdown();
    SCFree(p);
    return 1;
}
/** DecodeRawtest03
 *  \brief Valid Raw packet
 *  \retval 0 Expected test value
 */
static int DecodeRawTest03 (void)
{
 
    /* IPV13 */
    uint8_t raw_ip[] = {
        0xdf, 0x00, 0x00, 0x3d, 0x49, 0x42, 0x40, 0x00,
        0x40, 0x06, 0xcf, 0x8a, 0x0a, 0x1f, 0x03, 0xaf,
        0x0a, 0x1f, 0x0a, 0x02, 0xa5, 0xe7, 0xde, 0xad,
        0x00, 0x0c, 0xe2, 0x0e, 0x8b, 0xfe, 0x0c, 0xe7,
        0x80, 0x18, 0x00, 0xb7, 0xaf, 0xeb, 0x00, 0x00,
        0x01, 0x01, 0x08, 0x0a, 0x00, 0x08, 0xab, 0x4f,
        0x34, 0x40, 0x67, 0x31, 0x3b, 0x63, 0x61, 0x74,
        0x20, 0x6b, 0x65, 0x79, 0x3b };
 
    Packet *p = PacketGetFromAlloc();
    if (unlikely(p == NULL))
        return 0;
    ThreadVars tv;
    DecodeThreadVars dtv;
 
    memset(&dtv, 0, sizeof(DecodeThreadVars));
    memset(&tv,  0, sizeof(ThreadVars));
 
    if (PacketCopyData(p, raw_ip, sizeof(raw_ip)) == -1) {
        SCFree(p);
        return 0;
    }
 
    FlowInitConfig(FLOW_QUIET);
 
    DecodeRaw(&tv, &dtv, p, raw_ip, GET_PKT_LEN(p));
    if (!ENGINE_ISSET_EVENT(p,IPRAW_INVALID_IPV)) {
        printf("expected IPRAW_INVALID_IPV to be set but it wasn't: ");
        FlowShutdown();
        SCFree(p);
        return 0;
    }
    PACKET_RECYCLE(p);
    FlowShutdown();
    SCFree(p);
    return 1;
}
 
#endif /* UNITTESTS */
 
/**
 * \brief Registers Raw unit tests
 * \todo More Raw tests
 */
void DecodeRawRegisterTests(void)
{
#ifdef UNITTESTS
    UtRegisterTest("DecodeRawTest01", DecodeRawTest01);
    UtRegisterTest("DecodeRawTest02", DecodeRawTest02);
    UtRegisterTest("DecodeRawTest03", DecodeRawTest03);
#endif /* UNITTESTS */
}
/**
 * @}
 */