udp_gen.c

示范了Unix和Linux下如何利用Raw Socket构造伪装的TCP、IP、UDP的包

/* RAW socket utility routine:
 * 
 * Write out a UDP header.
 * [e-mail]
 * Thamer Al-Herbish
 */

#include <stdlib.h>
#include <stdio.h>

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

#include <netinet/in.h>
#include <arpa/inet.h>

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

#include <unistd.h>
#include <strings.h>

void udp_gen(char *packet,unsigned short sport,
	     unsigned short dport,unsigned short length)
{
  struct udphdr *udp;
  
  udp = (struct udphdr *)packet;

#if !defined(LINUX)
  udp->uh_sport = htons(sport);
  udp->uh_dport = htons(dport);
  udp->uh_ulen =  htons(length);
  udp->uh_sum = 0;
  
#else /* LINUX */
  udp->source = htons(sport);
  udp->dest = htons(dport);
  udp->len = htons(length);
  udp->check = 0;

#endif /* LINUX */
  
  return;
}