#include <stdlib.h>
#include <stdio.h>
#include <pcap.h>

int main(int argc, char **argv)
{
    pcap_t *fp;
    char errbuf[PCAP_ERRBUF_SIZE];
    u_char packet[100];
    int i;
    
    /* Open the adapter */
    if ((fp = pcap_open_live(argv[1],    // name of the device
                 65536,    // portion of the packet to capture. It doesn't matter in this case
                 1,    // promiscuous mode (nonzero means promiscuous)
                 1000,    // read timeout
                 errbuf    // error buffer
                     )) == NULL)
    {
        fprintf(stderr,"\nUnable to open the adapter. %s is not supported by WinPcap\n", argv[1]);
        return 2;
    }

    /* Supposing to be on ethernet, set mac destination to 1:1:1:1:1:1 */
    packet[0]=1; packet[1]=1; packet[2]=1; packet[3]=1; packet[4]=1; packet[5]=1;
    /* set mac source to 2:2:2:2:2:2 */
    packet[6]=2; packet[7]=2; packet[8]=2; packet[9]=2; packet[10]=2; packet[11]=2;    
    /* Fill the rest of the packet */
    for(i=12;i<100;i++) {packet[i]=i%256;}
    /* Send down the packet */
    if (pcap_sendpacket(fp,    // Adapter
        packet,        // buffer with the packet
        100        // size
        ) != 0)
    {
        fprintf(stderr,"\nError sending the packet: \n", pcap_geterr(fp));
        return 3;
    }

    pcap_close(fp);    
    return 0;
}