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📁 unix高级编程原吗
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<td width="68%" background="DDl_back2.jpg" height="44"><big><big><font face="黑体"><p align="center">               ● UNIX网络编程                       (BM: clown)                </font></big></big></td></tr>
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<tr><td width="100%" colspan="2" height="100" align="center" valign="top"><br><p align="center">[<a href="index.htm">回到开始</a>][<a href="155.htm">上一层</a>][<a href="175.htm">下一篇</a>]
<hr><p align="left"><small>发信人: digger (欧阳疯), 信区: Socket <br>

标  题: RAW sockets example code: tcp_gen.c <br>

发信站: 华南网木棉站 (Wed Aug  5 19:53:46 1998), 转信 <br>

  <br>

/* RAW socket utility routine: <br>

 * <br>

 * Write out a TCP header. <br>

 * shadows@whitefang.com <br>

 * Thamer Al-Herbish <br>

 */ <br>

  <br>

#include <stdlib.h> <br>

#include <stdio.h> <br>

  <br>

#include <sys/types.h> <br>

#include <sys/socket.h> <br>

  <br>

#include <netinet/in.h> <br>

#include <arpa/inet.h> <br>

  <br>

#include <netinet/in_systm.h> <br>

  <br>

#if defined(LINUX) <br>



#include <linux/tcp.h> <br>

#else <br>

#include <netinet/tcp.h> <br>

#endif <br>

  <br>

#include <unistd.h> <br>

#include <string.h> <br>

  <br>

#if defined(X2_OFF)         /* SCO */ <br>

#define TH_OFFSET 0x50         /* TCP header offset */ <br>

#else <br>

#define TH_OFFSET 5 <br>

#endif <br>

  <br>

#define TCP_WINDOW_SIZE 512 /* Just have it hardcoded. */ <br>

  <br>

void tcp_gen(char *packet,unsigned short sport, <br>

             unsigned short dport,unsigned long seq, <br>

             unsigned long ack) <br>

{ <br>

  struct tcphdr *tcp; <br>

  <br>

  <br>

  tcp = (struct tcphdr *)packet; <br>

  memset((char *)tcp,'\0',sizeof(struct tcphdr)); <br>

  <br>

#if !defined(LINUX) <br>

  tcp->th_sport = htons(sport); <br>

  tcp->th_dport = htons(dport); <br>

  <br>

  tcp->th_seq = htonl(seq); <br>

  tcp->th_ack = htonl(ack); <br>

  <br>

#ifdef X2_OFF <br>

  tcp->th_x2_off = TH_OFFSET; <br>

#else /* X2_OFF */ <br>

  tcp->th_off = TH_OFFSET; <br>

  tcp->th_x2 = 0; <br>

#endif /* X2_OFF */ <br>

  <br>

  tcp->th_win = htons(TCP_WINDOW_SIZE); <br>

  tcp->th_flags = TH_FIN; <br>

  <br>

#else /* LINUX */ <br>

  <br>

  <br>

  tcp->source = htons(sport); <br>

  tcp->dest = htons(dport); <br>

  <br>

  tcp->seq = htonl(seq); <br>

  tcp->ack_seq = htonl(ack); <br>

  <br>

  tcp->res1 = 0; <br>

  tcp->doff = TH_OFFSET; <br>

  <br>

  tcp->window = htons(TCP_WINDOW_SIZE); <br>

  tcp->fin = 1; <br>

  <br>

#endif /* LINUX */ <br>

  <br>

  return; <br>

} <br>

  <br>

-- <br>

                #################### <br>

                #  遥  眺  淑  女  # <br>

                ####################################### <br>

                                   #  君  子  好  球  # <br>



                                   #################### <br>

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