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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="317.htm">上一层</a>][<a href="436.htm">下一篇</a>]
<hr><p align="left"><small>发信人: rain (八角虫), 信区: Programming <br>
标 题: 一个简单的网络侦听程序 <br>
发信站: 武汉白云黄鹤站 (Mon Jul 5 02:14:58 1999), 转信 <br>
/* <br>
测试 SOCK_PACKET <br>
*/ <br>
#include <unistd.h> <br>
#include <sys/types.h> <br>
#include <sys/time.h> <br>
#include <signal.h> <br>
#include <stdio.h> <br>
#include <linux/if.h> <br>
#include <linux/if_ether.h> <br>
#include <linux/ip.h> <br>
#include <linux/tcp.h> <br>
#define BUFLEN 8192 <br>
#define ETHLINKHDR 14 <br>
void print_data(int count, char *buff) <br>
{ <br>
int i,j,c; <br>
int printnext=1; <br>
if (count) <br>
{ <br>
{ <br>
if (count%16) c=count+(16-count%16); <br>
else c=count; <br>
} <br>
else c=count; <br>
for (i=0;i<c;i++) <br>
{ <br>
if (printnext) { printnext--; printf("%.4x ", i&0xffff); } <br>
if (i<count) printf("%3.2x",buff[i]&0xff); <br>
else printf(" "); <br>
if (!((i+1)%8)) <br>
if((i+1)%16) printf(" -"); <br>
else <br>
{ <br>
printf(" "); <br>
for(j=i-15;j<=i;j++) <br>
if(j<count) <br>
{ <br>
if( (buff[j]&0xff) >= 0x20 && <br>
(buff[j]&0xff)<=0x7e) <br>
printf("%c",buff[j]&0xff); <br>
else printf("."); <br>
} <br>
else printf(" "); <br>
printf("\n"); printnext=1; <br>
} <br>
} <br>
} <br>
int initdevice(char *device, int pflag) <br>
{ <br>
#define PROTO htons(0x0800) /* Ethernet code for IP protocol */ <br>
int if_fd=0; <br>
struct ifreq ifr; <br>
if ( (if_fd=socket(AF_INET,SOCK_PACKET,PROTO)) < 0 ) <br>
{ <br>
perror("Can't get socket"); <br>
exit(2); <br>
} <br>
strcpy(ifr.ifr_name, device); /* interface we're gonna use */ <br>
if ( ioctl(if_fd, SIOCGIFFLAGS, &ifr) < 0 ) <br>
{ /* get flags */ <br>
close(if_fd); <br>
perror("Can't get flags"); <br>
exit(2); <br>
} <br>
} <br>
if ( pflag ) ifr.ifr_flags |= IFF_PROMISC; /* set promiscuous mo <br>
de * <br>
/ <br>
else ifr.ifr_flags &= ~(IFF_PROMISC); <br>
if( ioctl(if_fd, SIOCSIFFLAGS, &ifr) < 0 ) <br>
{ /* set flags */ <br>
close(if_fd); <br>
perror("Can't set flags"); <br>
exit(2); <br>
} <br>
return if_fd; <br>
} <br>
struct etherpacket <br>
{ <br>
struct ethhdr eth; <br>
struct iphdr ip; <br>
struct tcphdr tcp; <br>
char data[8192]; <br>
}; <br>
int main() <br>
{ <br>
int linktype; <br>
int if_eth_fd=initdevice("eth0",1); <br>
struct etherpacket ep; <br>
struct sockaddr dest; <br>
struct iphdr *ip; <br>
struct tcphdr *tcp; <br>
struct timeval timeout; <br>
fd_set rd,wr; <br>
int dlen; <br>
while (1) <br>
{ <br>
bzero(&dest,sizeof(dest)); <br>
dlen=0; <br>
FD_ZERO(&rd); <br>
FD_ZERO(&wr); <br>
FD_SET(if_eth_fd,&rd); <br>
timeout.tv_sec=0; <br>
timeout.tv_usec=0; <br>
ip=(struct iphdr *)(((unsigned long)&ep.ip)-2); <br>
tcp=(struct tcphdr *)(((unsigned long)&ep.tcp)-2); <br>
while (timeout.tv_sec==0 && timeout.tv_usec==0) <br>
{ <br>
timeout.tv_sec=10; <br>
timeout.tv_usec=0; <br>
select(20,&rd,&wr,NULL,&timeout); <br>
if (FD_ISSET(if_eth_fd,&rd)) <br>
{ <br>
printf("eth\n"); <br>
recvfrom(if_eth_fd,&ep,sizeof(ep),0,&dest,&dlen); <br>
} <br>
} <br>
printf("proto: %.4x",ntohs(ep.eth.h_proto)); <br>
if (ep.eth.h_proto==ntohs(ETH_P_IP)) <br>
{ <br>
printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x->", <br>
ep.eth.h_source[0],ep.eth.h_source[1], <br>
ep.eth.h_source[2],ep.eth.h_source[3], <br>
ep.eth.h_source[4],ep.eth.h_source[5]); <br>
printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n", <br>
ep.eth.h_dest[0],ep.eth.h_dest[1], <br>
ep.eth.h_dest[2],ep.eth.h_dest[3], <br>
ep.eth.h_dest[4],ep.eth.h_dest[5]); <br>
printf("%s[%d]->",inet_ntoa(ip->saddr),ntohs(tcp->source)); <br>
printf("%s[%d]\n",inet_ntoa(ip->daddr),ntohs(tcp->dest)); <br>
print_data(htons(ip->tot_len)-sizeof(ep.ip)-sizeof(ep.tcp),ep.da <br>
ta-2 <br>
); <br>
} <br>
} <br>
return 0; <br>
} <br>
-- <br>
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哈 哈 <br>
哈 佛颜常笑，笑世上可笑之人 哈 <br>
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忍 忍 <br>
忍忍忍忍忍忍忍忍忍忍忍忍忍忍忍 <br>
</small><hr>
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