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inverse_lookup6.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"
int rawmode = 0;
unsigned char dmac[6], *mac;
int done = 0;
void help(char *prg) {
printf("%s %s (c) 2022 by %s %s\n\n", prg, VERSION, AUTHOR, RESOURCE);
printf("Syntax: %s interface mac-address\n\n", prg);
printf(
"Performs an inverse address query, to get the IPv6 addresses that are "
"assigned\n");
printf("to a MAC address. Note that only few systems support this yet.\n");
exit(-1);
}
void check_packets(u_char *foo, const struct pcap_pkthdr *header,
const unsigned char *data) {
unsigned char *ptr = (unsigned char *)data, *orig_ptr;
int len = header->caplen, i, j;
if (rawmode == 0) {
if (do_hdr_size) {
ptr += do_hdr_size;
len -= do_hdr_size;
if ((ptr[0] & 240) != 0x60) return;
} else {
ptr += 14;
len -= 14;
}
}
orig_ptr = ptr;
if (debug) thc_dump_data(ptr, len, "Received Packet");
if (ptr[6] == 0x3a && ptr[40] == ICMP6_INVNEIGHBORADV && len >= 56) {
done = 1;
j = (len - 56) / 16;
if (j <= 0) {
printf("Empty Inverse Neighbor Discovery message received by %s for %s\n",
thc_ipv62notation((char *)ptr + 8), mac);
} else {
ptr += 48;
len -= 48;
while (len > 15) {
if (*ptr == 10) {
ptr++;
j = ((*ptr * 8) - 8) / 16;
printf(
"Inverse Advertisement Discovery message received by %s for %s "
"(%d entries):\n",
thc_ipv62notation((char *)orig_ptr + 8), mac, j);
if (j >= 1)
for (i = 0; i < j; i++)
printf(" %s\n", thc_ipv62notation((char *)ptr + 7 + i * 16));
} else
ptr++;
len -= *ptr * 8 - 1;
ptr += *ptr * 8 - 1;
}
}
}
}
int main(int argc, char *argv[]) {
unsigned char *pkt1 = NULL, buf[24];
unsigned char *dst6 = NULL, *smac, dstmac[16] = "", *dmac = dstmac;
int pkt1_len = 0;
char * interface, string[64] = "icmp6";
pcap_t * p;
memset(buf, 0, sizeof(buf));
if (argc != 3 || strncmp(argv[1], "-h", 2) == 0) help(argv[0]);
if (getenv("THC_IPV6_PPPOE") != NULL || getenv("THC_IPV6_6IN4") != NULL)
printf("WARNING: %s is not working with injection!\n", argv[0]);
interface = argv[1];
sscanf(argv[2], "%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]);
mac = argv[2];
if ((smac = thc_get_own_mac(interface)) == NULL) {
fprintf(stderr, "Error: invalid interface %s\n", interface);
exit(-1);
}
dst6 = thc_resolve6("ff02::1");
if ((pkt1 = thc_create_ipv6_extended(interface, PREFER_LINK, &pkt1_len, NULL,
dst6, 255, 0, 0, 0, 0)) == NULL)
return -1;
memset(buf, 0, sizeof(buf));
buf[0] = 0x01;
buf[1] = 0x01;
memcpy(buf + 2, smac, 6);
buf[8] = 0x02;
buf[9] = 0x01;
memcpy(buf + 10, dmac, 6);
if (thc_add_icmp6(pkt1, &pkt1_len, ICMP6_INVNEIGHBORSOL, 0, 0,
(unsigned char *)&buf, 16, 0) < 0)
return -1;
if (thc_generate_pkt(interface, smac, dmac, pkt1, &pkt1_len) < 0) {
fprintf(stderr, "Error: Can not generate packet, exiting ...\n");
exit(-1);
}
if ((p = thc_pcap_init(interface, string)) == NULL) {
fprintf(stderr, "Error: could not capture on interface %s with string %s\n",
interface, string);
exit(-1);
}
printf("Sending inverse packet for %s\n", argv[1]);
thc_send_pkt(interface, pkt1, &pkt1_len);
sleep(1);
while (thc_pcap_check(p, (char *)check_packets, NULL))
;
return 0; // never reached
}