62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
// TCP control bits
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#ifndef _TCPIP_
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#define _TCPIP_
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#define TH_SYN 0x02 // Synchronize sequence numbers
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#define TH_FIN 0x01 // Sender has reached end of his stream
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#define TH_RST 0x04 // Reset the connection
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#define TH_PUSH 0x08 // Push data to above level
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#define TH_ACK 0x10 // Acknowledgement field is valid
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#define TH_URG 0x20 // Urgent pointer is valid
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struct tcphdr {
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USHORT th_sport;
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USHORT th_dport;
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ULONG th_seq;
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ULONG th_ack;
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UCHAR th_off;
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UCHAR th_flags;
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USHORT th_win;
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UCHAR th_sumhi;
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UCHAR th_sumlo;
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USHORT th_urp;
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UCHAR th_data[1];
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};
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#define IP_ALEN 4
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typedef struct IPaddr {
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ULONG s_addr;
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} IPaddr;
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#define IPPROTO_TCP 6
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struct ip_v4 {
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UCHAR ip_hl;
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UCHAR ip_tos;
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USHORT ip_len;
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USHORT ip_id;
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USHORT ip_off;
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UCHAR ip_ttl;
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UCHAR ip_p;
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USHORT ip_sum;
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IPaddr ip_src;
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IPaddr ip_dst;
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UCHAR ip_data[1];
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};
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typedef struct ip_v4 IPV4Header, *PIPV4Header;
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typedef struct _PPTP_HEADER {
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USHORT Length;
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USHORT PacketType;
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ULONG Cookie;
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USHORT MessageType;
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USHORT Reserved1;
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} PPTP_HEADER, *PPPTP_HEADER;
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#endif // _TCPIP_
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