common/include/decode_tcp.h


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46

#ifndef _DECODE_TCP_H
#define _DECODE_TCP_H

#ifdef __cpluscplus
extern "C"
{
#endif

#include "public.h"

#define TCP_HEADER_LEN 20

    typedef struct tcp_header_s
    {
        uint16_t th_sport; /**< source port */
        uint16_t th_dport; /**< destination port */
        uint32_t th_seq;   /**< sequence number */
        uint32_t th_ack;   /**< acknowledgement number */
        uint8_t th_offx2;  /**< offset and reserved */
        uint8_t th_flags;  /**< pkt flags */
        uint16_t th_win;   /**< pkt window */
        uint16_t th_sum;   /**< checksum */
        uint16_t th_urp;   /**< urgent pointer */
    } __attribute__((__packed__)) tcp_header_t;

    typedef struct tcp_info_s
    {
        uint16_t src_port;
        uint16_t dst_port;

        tcp_header_t *hdr;
        uint8_t *payload;

        uint32_t opt_len;
        uint32_t hdr_len;
        uint32_t payload_len;
    } tcp_info_t;

    int decode_tcp(tcp_info_t *packet, const uint8_t *data, uint32_t len);
    void dump_tcp_info(uint32_t pkt_id, tcp_info_t *packet);

#ifdef __cpluscplus
}
#endif

#endif