| skipped 26 lines |
| 27 | 27 | | #define IP_HL(ip) (((ip)->ip_vhl) & 0x0f) |
| 28 | 28 | | #define IP_V(ip) (((ip)->ip_vhl) >> 4) |
| 29 | 29 | | |
| | 30 | + | typedef unsigned int tcp_seq; |
| | 31 | + | |
| | 32 | + | // tcp header |
| | 33 | + | struct sniff_tcp{ |
| | 34 | + | unsigned short th_sport; // source port |
| | 35 | + | unsigned short th_dport; // destination port |
| | 36 | + | tcp_seq th_seq; // sequence number |
| | 37 | + | tcp_seq th_ack; // acknowledgement number |
| | 38 | + | unsigned char th_offx2; // data offset, rsvd |
| | 39 | + | #define TH_OFF(th) (((th)->th_offx2 & 0xf0) >> 4) |
| | 40 | + | unsigned char th_flags; |
| | 41 | + | #define TH_FIN 0x01 |
| | 42 | + | #define TH_SYN 0x02 |
| | 43 | + | #define TH_RST 0x04 |
| | 44 | + | #define TH_PUSH 0x08 |
| | 45 | + | #define TH_ACK 0x10 |
| | 46 | + | #define TH_URG 0x20 |
| | 47 | + | #define TH_ECE 0x40 |
| | 48 | + | #define TH_CWR 0x80 |
| | 49 | + | #define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG|TH_ECE|TH_CWR) |
| | 50 | + | unsigned short th_win; // window |
| | 51 | + | unsigned short th_sum; // checksum |
| | 52 | + | unsigned short th_urp; // urgent pointer |
| | 53 | + | }; |
| | 54 | + | |
| 30 | 55 | | // udp header |
| 31 | 56 | | struct sniff_udp{ |
| 32 | 57 | | unsigned short udph_sport; |
| skipped 9 lines |
