Graphics Programs Reference
In-Depth Information
if (pd->file_mem == NULL)
pd->file_s = 0;
arp_packetlen = LIBNET_ARP_H + LIBNET_ETH_H + pd->file_s;
#ifdef DEBUG
printf("DEBUG: ARP packet length %u.\n", arp_packetlen);
printf("DEBUG: ARP payload size %u.\n", pd->file_s);
#endif
if ((l2 =
libnet_open_link_interface(device, errbuf)
) == NULL)
{
nemesis_device_failure(INJECTION_LINK, (const char *)device);
return -1;
}
if
(libnet_init_packet(arp_packetlen, &pkt)
== -1)
{
fprintf(stderr, "ERROR: Unable to allocate packet memory.\n");
return -1;
}
libnet_build_ethernet(eth->ether_dhost, eth->ether_shost, eth->ether_type,
NULL, 0, pkt);
libnet_build_arp(arp->ar_hrd, arp->ar_pro, arp->ar_hln, arp->ar_pln,
arp->ar_op, arp->ar_sha, arp->ar_spa, arp->ar_tha, arp->ar_tpa,
pd->file_mem, pd->file_s, pkt + LIBNET_ETH_H);
n = libnet_write_link_layer(l2, device, pkt, LIBNET_ETH_H +
LIBNET_ARP_H + pd->file_s);
if (verbose == 2)
nemesis_hexdump(pkt, arp_packetlen, HEX_ASCII_DECODE);
if (verbose == 3)
nemesis_hexdump(pkt, arp_packetlen, HEX_RAW_DECODE);
if (n != arp_packetlen)
{
fprintf(stderr, "ERROR: Incomplete packet injection. Only "
"wrote %d bytes.\n", n);
}
else
{
if (verbose)
{
if (memcmp(eth->ether_dhost, (void *)&one, 6))
{
printf("Wrote %d byte unicast ARP request packet through "
"linktype %s.\n", n,
nemesis_lookup_linktype(l2->linktype));
}
else
{
printf("Wrote %d byte %s packet through linktype %s.\n", n,
