1 #include <pcap.h>
  2 #include "hacking.h"
  3
  4 void pcap_fatal(const char *failed_in, const char *errbuf) {
  5     printf("Fatal Error in %s: %s\n", failed_in, errbuf);
  6     exit(1);
  7 }
  8
  9 int main() {
 10     struct pcap_pkthdr header;
 11     const u_char *packet;
 12     char errbuf[PCAP_ERRBUF_SIZE];
 13     char *device;
 14     pcap_t *pcap_handle;
 15     int i;
 16
 17     device = pcap_lookupdev(errbuf);
 18     if(device == NULL)
 19             pcap_fatal("pcap_lookupdev", errbuf);
 20
 21     printf("Sniffing on device %s \n", device);
 22
 23     pcap_handle = pcap_open_live(device, 4096, i, 0, errbuf);
 24     if(pcap_handle = NULL)
 25             pcap_fatal("pcap_open_live", errbuf);
 26
 27     for(i=0; i < 3; i++) {
 28             packet = pcap_next(pcap_handle, &header);
 29             printf("Got a %d byte packet\n", header.len);
 30             dump(packet, header.len);
 31     }
 32     pcap_close(pcap_handle);
 33 }