winpcap/Examples/misc/sendpack.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3
   4 #include <pcap.h>
   5
   6
   7 void main(int argc, char **argv)
   8 {
   9 pcap_t *fp;
  10 char errbuf[PCAP_ERRBUF_SIZE];
  11 u_char packet[100];
  12 int i;
  13
  14         /* Check the validity of the command line */
  15         if (argc != 2)
  16         {
  17                 printf("usage: %s interface (e.g. 'rpcap://eth0')", argv[0]);
  18                 return;
  19         }
  20
  21         /* Open the output device */
  22         if ( (fp= pcap_open(argv[1],                    // name of the device
  23                                                 100,                            // portion of the packet to capture (only the first 100 bytes)
  24                                                 PCAP_OPENFLAG_PROMISCUOUS,      // promiscuous mode
  25                                                 1000,                           // read timeout
  26                                                 NULL,                           // authentication on the remote machine
  27                                                 errbuf                          // error buffer
  28                                                 ) ) == NULL)
  29         {
  30                 fprintf(stderr,"\nUnable to open the adapter. %s is not supported by WinPcap\n", argv[1]);
  31                 return;
  32         }
  33
  34         /* Supposing to be on ethernet, set mac destination to 1:1:1:1:1:1 */
  35         packet[0]=1;
  36         packet[1]=1;
  37         packet[2]=1;
  38         packet[3]=1;
  39         packet[4]=1;
  40         packet[5]=1;
  41
  42         /* set mac source to 2:2:2:2:2:2 */
  43         packet[6]=2;
  44         packet[7]=2;
  45         packet[8]=2;
  46         packet[9]=2;
  47         packet[10]=2;
  48         packet[11]=2;
  49
  50         /* Fill the rest of the packet */
  51         for(i=12;i<100;i++)
  52         {
  53                 packet[i]=i%256;
  54         }
  55
  56         /* Send down the packet */
  57         if (pcap_sendpacket(fp, packet, 100 /* size */) != 0)
  58         {
  59                 fprintf(stderr,"\nError sending the packet: \n", pcap_geterr(fp));
  60                 return;
  61         }
  62
  63         return;
  64 }