headers.h

LINUX网络编程文档

struct ip{
	unsigned int ip_length:4;
	unsigned int ip_version:4;
	unsigned char ip_tos;
	unsigned short ip_total_length;
	unsigned short ip_id;
	unsigned short ip_flags;
	unsigned char ip_ttl;
	unsigned char ip_protocol;
	unsigned short ip_cksum;
	unsigned int ip_source;
	unsigned int ip_dest;
	};
struct tcp{
	unsigned short tcp_source_port;
	unsigned short tcp_dest_port;
	unsigned int tcp_seqno;
	unsigned int tcp_ackno;
	unsigned int tcp_res1:4,
		     tcp_hlen:4,
		     tcp_fin:1,
		     tcp_syn:1,
		     tcp_rst:1,
		     tcp_psh:1,
		     tcp_ack:1,
		     tcp_urg:1,
		     tcp_res2:2;
	unsigned short tcp_winsize;
	unsigned short tcp_cksum;
	unsigned short tcp_urgent;
	};