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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="180.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: udp.c <br>
发信站: 华南网木棉站 (Wed Aug 5 19:59:11 1998), 转信 <br>
/* Write a udp packet and send it through <br>
* a raw socket. <br>
* Thamer Al-Herbish shadows@whitefang.com <br>
*/ <br>
#include <stdlib.h> <br>
#include <stdio.h> <br>
#include <sys/types.h> <br>
#include <sys/socket.h> <br>
#include <netinet/in.h> <br>
#include <arpa/inet.h> <br>
#include <netinet/in_systm.h> <br>
#if defined(LINUX) <br>
#include <linux/ip.h> <br>
#include <linux/udp.h> <br>
#else <br>
#include <netinet/ip.h> <br>
#include <netinet/udp.h> <br>
#endif <br>
#if defined(SOLARIS_CKSUM_BUG) <br>
#include <netinet/tcp.h> <br>
#endif <br>
#include <rawsock_utils.h> <br>
#include <string.h> <br>
#define MESG_LENGTH 12 <br>
int main(int argc,char *argv[]) <br>
{ <br>
unsigned char packet[ <br>
#if !defined(LINUX) <br>
sizeof(struct ip) + <br>
#else /* LINUX */ <br>
sizeof(struct iphdr) + <br>
#endif /* LINUX */ <br>
sizeof(struct udphdr) + <br>
MESG_LENGTH]; <br>
struct in_addr saddr, daddr; <br>
unsigned short sport, dport; <br>
struct sockaddr_in mysocket; <br>
struct udphdr *udphdr; <br>
int sockd, on = 1; <br>
if(argc < 5) { <br>
fprintf(stderr,"usage: %s source_port source_address dest_port dest_addr <br>
ess\ <br>
ess\ <br>
", <br>
argv[0]); <br>
exit(1); <br>
} <br>
sport = (unsigned short)atoi(argv[1]); <br>
saddr.s_addr = inet_addr(argv[2]); <br>
dport = (unsigned short)atoi(argv[3]); <br>
daddr.s_addr = inet_addr(argv[4]); <br>
if((sockd = socket(AF_INET,SOCK_RAW,IPPROTO_RAW)) < 0) { <br>
perror("socket"); <br>
exit(1); <br>
} <br>
if(setsockopt(sockd,IPPROTO_IP,IP_HDRINCL,(char *)&on,sizeof(on)) < 0) { <br>
perror("setsockopt"); <br>
exit(1); <br>
} <br>
ip_gen(packet,IPPROTO_UDP,saddr,daddr,sizeof(packet)); <br>
#if !defined(LINUX) <br>
udphdr = (struct udphdr *)(packet + sizeof(struct ip)); <br>
memset((packet+sizeof(struct udphdr)+sizeof(struct ip)), <br>
'0',MESG_LENGTH); /* Just zero out the message content. */ <br>
udp_gen((char *)udphdr,sport,dport,(sizeof(struct udphdr) + MESG_LENGTH)); <br>
<br>
#if !defined(SOLARIS_CKSUM_BUG) <br>
udphdr->uh_sum = trans_check(IPPROTO_UDP,(char *)udphdr, <br>
(MESG_LENGTH + sizeof(struct udphdr)), <br>
saddr, <br>
daddr); <br>
#else /* SOLARIS_CKSUM_BUG */ <br>
udphdr->uh_sum = sizeof(struct tcphdr); <br>
#endif /* SOLARIS_CKSUM_BUG */ <br>
#else /* LINUX */ <br>
udphdr = (struct udphdr *)(packet + sizeof(struct iphdr)); <br>
memset((packet+sizeof(struct udphdr)+sizeof(struct iphdr)), <br>
'0',MESG_LENGTH); /* Just zero out the message content. */ <br>
udp_gen((char *)udphdr,sport,dport,(sizeof(struct udphdr) + MESG_LENGTH)); <br>
<br>
#if !defined(SOLARIS_CKSUM_BUG) <br>
udphdr->check = trans_check(IPPROTO_UDP,(char *)udphdr, <br>
(MESG_LENGTH + sizeof(struct udphdr)), <br>
saddr, <br>
daddr); <br>
#else /* SOLARIS_CKSUM_BUG */ <br>
udphdr->check = sizeof(struct tcphdr); <br>
#endif /* SOLARIS_CKSUM_BUG */ <br>
#endif /* LINUX */ <br>
memset(&mysocket,'\0',sizeof(mysocket)); <br>
mysocket.sin_family = AF_INET; <br>
mysocket.sin_port = htons(dport); <br>
mysocket.sin_addr = daddr; <br>
if(sendto(sockd,&packet,sizeof(packet),0x0,(struct sockaddr *)&mysocket, <br>
sizeof(mysocket)) != sizeof(packet)) { <br>
perror("sendto"); <br>
exit(1); <br>
} <br>
exit(0); <br>
} <br>
-- <br>
#################### <br>
# 遥 眺 淑 女 # <br>
####################################### <br>
# 君 子 好 球 # <br>
#################### <br>
※ 修改:．digger 于 Aug 5 20:25:58 修改本文．[FROM: 202.96.151.219] <br>
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