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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"
char *frbuf, *frbuf2, *frint, buf3[1504];
int frbuflen, frbuf2len, do_hop = 0, do_frag = 0, do_dst = 0, type = NXT_ICMP6, seen = 0, ret = -1;
unsigned char *frip6, *frmac, *frdst;
thc_ipv6_hdr *frhdr = NULL;
void help(char *prg) {
printf("%s %s (c) 2019 by %s %s\n\n", prg, VERSION, AUTHOR, RESOURCE);
printf("Syntax: %s interface target\n\n", prg);
printf("Sends an ICMPv6 node query request to the target and dumps the replies.\n\n");
// printf("Use -r to use raw mode.\n\n");
exit(-1);
}
void dump_node_reply(u_char *foo, const struct pcap_pkthdr *header, const unsigned char *data) {
unsigned char *ipv6hdr = (unsigned char *) (data + 14), *ptr;
int i, len = header->caplen - 14;
if (do_hdr_size) {
len = header->caplen - do_hdr_size;
ipv6hdr = (unsigned char *) (data + do_hdr_size);
if ((ipv6hdr[0] & 240) != 0x60)
return;
}
if (ipv6hdr[6] != NXT_ICMP6 || ipv6hdr[40] != ICMP6_INFOREPLY || len < 40 + 16)
return;
ret = 0;
printf("Reply from %s:\n", thc_ipv62notation(ipv6hdr + 8));
switch (ipv6hdr[45]) {
case 2:
printf(" DNS result: ");
if (len <= 60) {
printf("empty\n");
} else {
ptr = ipv6hdr + 61;
while (*ptr != 0) {
if (*ptr > 0 && *ptr < 32)
*ptr = '.';
ptr++;
}
printf("%s\n", ipv6hdr + 61);
}
seen++;
break;
case 3:
printf(" IPv6 result: ");
if (len <= 76) {
printf("empty\n");
} else {
printf("\n");
i = 60;
while (i + 16 <= len) {
printf(" %s\n", thc_ipv62notation((char *) (ipv6hdr+ i)));
i += 20;
}
}
seen++;
break;
case 4:
printf(" IPv4 result: ");
if (len == 56) {
printf("empty\n");
} else {
printf("\n");
i = 60;
while (i + 4 <= len) {
printf(" %d.%d.%d.%d\n", ipv6hdr[i], ipv6hdr[i + 1], ipv6hdr[i + 2], ipv6hdr[i + 3]);
i += 8;
}
}
seen++;
break;
default:
printf(" Unknown type (%d) we did not send!\n", ipv6hdr[45]);
}
printf("\n");
}
void clean_exit(int sig) {
if (seen == 0)
printf("No reply received.\n");
exit(ret);
}
int main(int argc, char *argv[]) {
char *interface, mac[6] = "", string[] = "ip6 and icmp6";
unsigned char *mac6 = mac;
unsigned char buf[512];
unsigned char *dst;
int i, cnt;
unsigned char *pkt = NULL;
int pkt_len = 0;
int rawmode = 0;
pcap_t *p;
if (argc != 3 || strncmp(argv[1], "-h", 2) == 0)
help(argv[0]);
while ((i = getopt(argc, argv, "r")) >= 0) {
switch (i) {
case 'r':
thc_ipv6_rawmode(1);
rawmode = 1;
break;
default:
fprintf(stderr, "Error: invalid option %c\n", i);
exit(-1);
}
}
interface = argv[optind];
mac6 = thc_get_own_mac(interface);
if ((dst = thc_resolve6(argv[2])) == NULL) {
fprintf(stderr, "Error: could not resolve %s\n", argv[2]);
return -1;
}
memset(buf, 0, sizeof(buf));
memcpy(buf + 8, dst, 16);
i = 24;
cnt += getpid();
memcpy(buf + 4, (char *) &cnt + _TAKE4, 4);
cnt++;
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);
}
if ((pkt = thc_create_ipv6_extended(interface, PREFER_LINK, &pkt_len, NULL, dst, 255, 0, 0, 0xe0, 0)) == NULL)
return -1;
if (thc_add_icmp6(pkt, &pkt_len, ICMP6_INFOREQUEST, 0, 0x00020000, buf, i, 0) < 0)
return -1;
if (thc_generate_and_send_pkt(interface, mac6, NULL, pkt, &pkt_len) < 0)
return -1;
usleep(1000);
memcpy(buf + 4, (char *) &cnt + _TAKE4, 4);
cnt++;
if ((pkt = thc_create_ipv6_extended(interface, PREFER_LINK, &pkt_len, NULL, dst, 255, 0, 0, 0xe0, 0)) == NULL)
return -1;
if (thc_add_icmp6(pkt, &pkt_len, ICMP6_INFOREQUEST, 0, 0x0003003e, buf, i, 0) < 0)
return -1;
if (thc_generate_and_send_pkt(interface, mac6, NULL, pkt, &pkt_len) < 0)
return -1;
usleep(1000);
memcpy(buf + 4, (char *) &cnt + _TAKE4, 4);
cnt++;
if ((pkt = thc_create_ipv6_extended(interface, PREFER_LINK, &pkt_len, NULL, dst, 255, 0, 0, 0xe0, 0)) == NULL)
return -1;
if (thc_add_icmp6(pkt, &pkt_len, ICMP6_INFOREQUEST, 0, 0x00040002, buf, i, 0) < 0)
return -1;
if (thc_generate_and_send_pkt(interface, mac6, NULL, pkt, &pkt_len) < 0)
return -1;
signal(SIGALRM, clean_exit);
alarm(5);
while (seen != 3) {
while (thc_pcap_check(p, (char *) dump_node_reply, NULL) > 0);
usleep(100);
}
clean_exit(0);
return 0; // not reached
}
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