c语言指定网口捕获数据包--使用libpcap包

/*Listing 2. Simple snifferTo compile: gcc simplesniffer.c -o simplesinffer -lpcap*/#include <stdio.h>#include <pcap.h> int main(int argc, char **argv){system("clear");pcap_t *fp; char errbuf[PCAP_ERRBUF_SIZE];pcap_t *descr= pcap_open_offline("/home/IPS/test.pcap",errbuf);const u_char * packet; struct pcap_pkthdr hdr; packet = pcap_next(descr, &hdr);//printf("packet: %s\n",packet);fflush(stdout);/* Open the output device */if ( (fp= pcap_open_live("eth3", 100, 1,1000,errbuf ) ) == NULL){fprintf(stderr,"\nUnable to open the adapter. %s is not supported \n", "eth3");return 0;}printf("open the output device success!\n");getchar();while (packet){unsigned packetSize= hdr.len;printf("packeSize is :%d\n",packetSize);unsigned i=0;/*for (i=0; i< packetSize;i++){//printf("now i is %d\n",i);//sleep(2);} *///pcap_sendpacket(sp->handle.pcap, data, (int)len);pcap_sendpacket(fp, packet, packetSize);packet = pcap_next(descr, &hdr);printf("send packet over!:%s \n",descr);}pcap_close(descr);return 0;}

complie：gcc simplesniffer.c -o simplesinffer -lpcap