/* Copyright (c) 2008 Victor Julien <victor@inliniac.net> */

#include "eidps-common.h"
#include "decode.h"
#include "decode-icmpv4.h"
#include "util-unittest.h"

/** DecodeICMPV4
 *  \brief Main ICMPv4 decoding function
 */
void DecodeICMPV4(ThreadVars *t, Packet *p, uint8_t *pkt, uint16_t len)
{
    p->icmpv4h = (ICMPV4Hdr *)pkt;

    PerfCounterIncr(COUNTER_DECODER_ICMPV4, t->pca);

    if (len < ICMPV4_HEADER_LEN) {
        return;
    }

#ifdef DEBUG
    printf("ICMPV4 TYPE %" PRIu32 " CODE %" PRIu32 "\n", p->icmpv4h->type, p->icmpv4h->code);
#endif

    p->proto = IPPROTO_ICMP;
    return;
}

#ifdef UNITTESTS

/** DecodeICMPV4test01
 *  \brief
 *  \retval 0 Expected test value
 */
static int DecodeICMPV4test01(void) {
    uint8_t raw_icmpv4[] = {
        0x08, 0x00, 0x78, 0x47, 0xfc, 0x55, 0x00, 0x04,
        0x52, 0xab, 0x86, 0x4a, 0x84, 0x50, 0x0e, 0x00,
        0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab,
        0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab,
        0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab,
        0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab,
        0xab };
    Packet p;
    ThreadVars tv;

    memset(&tv, 0, sizeof(ThreadVars));
    memset(&p, 0, sizeof(Packet));

    DecodeICMPV4(&tv, &p, raw_icmpv4, sizeof(raw_icmpv4));
    return 0;
}

/** DecodeICMPV4test02
 *  \brief
 *  \retval 0 Expected test value
 */
static int DecodeICMPV4test02(void) {
    uint8_t raw_icmpv4[] = {
        0x00, 0x00, 0x57, 0x64, 0xfb, 0x55, 0x00, 0x03,
        0x43, 0xab, 0x86, 0x4a, 0xf6, 0x49, 0x02, 0x00,
        0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
        0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
        0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
        0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f };
    Packet p;
    ThreadVars tv;

    memset(&tv, 0, sizeof(ThreadVars));
    memset(&p, 0, sizeof(Packet));

    DecodeICMPV4(&tv, &p, raw_icmpv4, sizeof(raw_icmpv4));
    return 0;
}

/** DecodeICMPV4test03
 *  \brief  TTL exceeded
 *  \retval Expected test value: 0
 */
static int DecodeICMPV4test03(void) {
    uint8_t raw_icmpv4[] = {
        0x0b, 0x00, 0x6a, 0x3d, 0x00, 0x00, 0x00, 0x00,
        0x45, 0x00, 0x00, 0x3c, 0x64, 0x15, 0x00, 0x00,
        0x01, 0x11, 0xde, 0xfd, 0xc0, 0xa8, 0x01, 0x0d,
        0xd1, 0x55, 0xe3, 0x93, 0x8b, 0x12, 0x82, 0xaa,
        0x00, 0x28, 0x7c, 0xdd };
    Packet p;
    ThreadVars tv;

    memset(&tv, 0, sizeof(ThreadVars));
    memset(&p, 0, sizeof(Packet));

    DecodeICMPV4(&tv, &p, raw_icmpv4, sizeof(raw_icmpv4));
    return 0;
}

/** DecodeICMPV4test04
 *  \brief dest. unreachable, administratively prohibited
 *  \retval 0 Expected test value
 */
static int DecodeICMPV4test04(void) {
    uint8_t raw_icmpv4[] = {
        0x03, 0x0a, 0x36, 0xc3, 0x00, 0x00, 0x00, 0x00,
        0x45, 0x00, 0x00, 0x3c, 0x62, 0xee, 0x40, 0x00,
        0x33, 0x06, 0xb4, 0x8f, 0xc0, 0xa8, 0x01, 0x0d,
        0x58, 0x60, 0x16, 0x29, 0xb1, 0x0a, 0x00, 0x32,
        0x3e, 0x36, 0x38, 0x7c, 0x00, 0x00, 0x00, 0x00,
        0xa0, 0x02, 0x16, 0xd0, 0x72, 0x04, 0x00, 0x00,
        0x02, 0x04, 0x05, 0x8a, 0x04, 0x02, 0x08, 0x0a };
    Packet p;
    ThreadVars tv;

    memset(&tv, 0, sizeof(ThreadVars));
    memset(&p, 0, sizeof(Packet));

    DecodeICMPV4(&tv, &p, raw_icmpv4, sizeof(raw_icmpv4));
    return 0;
}

/**
 * \brief Registers ICMPV4 unit test
 * \todo More ICMPv4 tests
 */
void DecodeICMPV4RegisterTests(void) {
    UtRegisterTest("DecodeICMPV4ttest01", DecodeICMPV4test01, 0);
    UtRegisterTest("DecodeICMPV4ttest02", DecodeICMPV4test02, 0);
    UtRegisterTest("DecodeICMPV4ttest03", DecodeICMPV4test03, 0);
    UtRegisterTest("DecodeICMPV4ttest04", DecodeICMPV4test04, 0);
}

#endif /* UNITTESTS */