今天用了下这个　ｌｉｂｐｃａｐ　感觉和　ｗｉｎｄｏｗｓ　下的　ｗｉｎｐｃａｐ还是有点差别的。。下面的这个小程序演示如何打开网卡　捕获数据包　

#include 
    
     #include 
     
       //for struct in_addr#include 
      
       #include 
       
        #include 
        
         #include 
         
          #include 
          
           #include "proto.h"#define BUFSIZE 65535int main(int argc, char *argv[]){ char *dev, errbuf[PCAP_ERRBUF_SIZE]; dev= pcap_lookupdev(errbuf); if(dev == NULL) { fprintf(stderr,"Couldn't find default device: %s\n", errbuf); return(2); } printf("Device:%s\n", dev); pcap_t *handle; pcap_pkthdr *pk; const u_char *pkt_data; handle = pcap_open_live(dev, BUFSIZE, 1, 1000, errbuf); if (handle == NULL) { fprintf(stderr, "Couldn't open device %s: %s\n", dev, errbuf); return(2); } while(pcap_next_ex(handle,&pk,&pkt_data)>=0) { static unsigned int c = 0; sniff_ip *ip = (sniff_ip *)(pkt_data+14); printf("%s->%s\n",inet_ntoa(ip->ip_src),inet_ntoa(ip->ip_dst)); // printf("%u len:%u\r",c++,pk->caplen); } pcap_close(handle); return(0);}