/
fake_mld26.c
225 lines (210 loc) · 6.89 KB
/
fake_mld26.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;
char *multicast6 = NULL;
int empty = 0;
void help(char *prg) {
printf("%s %s (c) 2022 by %s %s\n\n", prg, VERSION, AUTHOR, RESOURCE);
printf(
"Syntax: %s [-l] interface add|delete|query [multicast-address "
"[target-address-to-subscribe-from [ttl [own-ip [own-mac-address "
"[destination-mac-address]]]]]]\n\n",
prg);
printf(
"This uses the MLDv2 protocol. Only a subset of what the protocol is "
"able to\n");
printf(
"do is possible to implement via a command line. Code it if you need "
"something.\n");
printf(
"Ad(d)vertise or delete yourself - or anyone you want - in a multicast "
"group of your choice\n");
printf("Query ask on the network who is listening to multicast addresses\n");
printf(
"Use -l to loop and send (in 5s intervals) until Control-C is "
"pressed.\n");
// printf("Use -r to use raw mode.\n\n");
exit(-1);
}
void check_packets(u_char *foo, const struct pcap_pkthdr *header,
const unsigned char *data) {
unsigned char *ptr = (unsigned char *)data;
int i, j = 0, offset = 56, len = header->caplen;
if (rawmode == 0) {
ptr += 14;
len -= 14;
}
if (do_hdr_size) {
ptr += (do_hdr_size - 14);
len -= (do_hdr_size - 14);
if ((ptr[0] & 240) != 0x60) return;
}
if (debug) thc_dump_data(ptr, len, "Received Packet");
if (ptr[6] == 0 && ptr[40] == 0x3a && ptr[41] == 0 && ptr[42] == 5 &&
ptr[48] == ICMP6_MLD2_REPORT && len >= 76)
if (empty == 1 || memcmp(multicast6, ptr + 60, 16) == 0) {
i = ptr[55];
while (j < i) {
if (ptr[offset] % 2 == 1)
printf("MLD Report: %s is listening on %s\n",
thc_ipv62notation(ptr + 8),
thc_ipv62notation(ptr + offset + 4));
if (ptr[offset] % 2 == 0)
printf("MLD Report: %s was listening on %s\n",
thc_ipv62notation(ptr + 8),
thc_ipv62notation(ptr + offset + 4));
j++;
offset += ptr[57] * 4 + 20 + ptr[58] * 256 * 16 + ptr[59] * 16;
if (offset > len - 20) // packet shorter than it should be
j = i;
}
}
if (ptr[6] == 0 && ptr[40] == 0x3a && ptr[41] == 0 && ptr[42] == 5 &&
ptr[48] == ICMP6_MLD_REPORT && len >= 72)
if (empty == 1 || memcmp(multicast6, ptr + 56, 16) == 0)
printf("MLD Report: %s is listening on %s\n", thc_ipv62notation(ptr + 8),
thc_ipv62notation(ptr + 56));
}
int main(int argc, char *argv[]) {
unsigned char *pkt1 = NULL, buf[36];
unsigned char *dst6 = NULL, *src6 = NULL, *target6, srcmac[16] = "",
*mac = srcmac, dstmac[16] = "", *dmac = dstmac;
int pkt1_len = 0, buflen = 36, i = 0, j;
char * interface, string[64] = "ip6 and not udp and not tcp";
int ttl = 1, mode = 0, wait = 1, loop = 0, actionmode = 0;
pcap_t *p;
memset(buf, 0, sizeof(buf));
if (argc > 1 && argv[0] != NULL && strcmp(argv[1], "-r") == 0) {
thc_ipv6_rawmode(1);
rawmode = 1;
argv++;
argc--;
}
if (argc > 1 && argv[0] != NULL && strcmp(argv[1], "-l") == 0) {
loop = 1;
argv++;
argc--;
}
if (argc > 1 && argv[0] != NULL && strcmp(argv[1], "-r") == 0) {
thc_ipv6_rawmode(1);
rawmode = 1;
argv++;
argc--;
}
if (argc < 3 || strncmp(argv[1], "-h", 2) == 0) help(argv[0]);
interface = argv[1];
if (strncasecmp(argv[2], "add", 3) == 0) {
mode = ICMP6_MLD2_REPORT;
actionmode = 3;
}
if (strncasecmp(argv[2], "del", 3) == 0) {
mode = ICMP6_MLD2_REPORT;
actionmode = 4;
}
if (strncasecmp(argv[2], "que", 3) == 0) {
mode = ICMP6_MLD_QUERY;
wait = 0x0444 << 16;
buflen = 20;
}
if (mode == 0) {
fprintf(stderr, "Error: no mode defined, specify add, delete or query\n");
exit(-1);
}
if (argc == 3 || argv[3] == NULL || argv[3][0] == 0) {
multicast6 = thc_resolve6("::");
empty = 1;
} else {
if ((multicast6 = thc_resolve6(argv[3])) == NULL) {
fprintf(stderr, "Error: %s does not resolve to a valid IPv6 address\n",
argv[3]);
exit(-1);
}
for (j = 0; j < 16; j++)
i += multicast6[j];
if (i == 0) empty = 1;
}
if (mode == ICMP6_MLD_QUERY) {
if (memcmp(multicast6, buf, 16))
dst6 = multicast6;
else
dst6 = thc_resolve6("ff02::1");
} else
dst6 = thc_resolve6("ff02::16");
if (argv[5] != NULL && argc > 5) ttl = atoi(argv[5]);
if (argv[6] != NULL && argc > 6)
src6 = thc_resolve6(argv[6]);
else
src6 = thc_get_own_ipv6(interface, dst6, PREFER_LINK);
if (argv[4] != NULL && argc > 4)
target6 = thc_resolve6(argv[4]);
else
target6 = NULL;
if (rawmode == 0) {
if (argv[7] != NULL && argc > 7)
sscanf(argv[7], "%x:%x:%x:%x:%x:%x", (unsigned int *)&srcmac[0],
(unsigned int *)&srcmac[1], (unsigned int *)&srcmac[2],
(unsigned int *)&srcmac[3], (unsigned int *)&srcmac[4],
(unsigned int *)&srcmac[5]);
else
mac = thc_get_own_mac(interface);
if (argv[8] != NULL && argc > 8)
sscanf(argv[8], "%x:%x:%x:%x:%x:%x", (unsigned int *)&dstmac[0],
(unsigned int *)&dstmac[1], (unsigned int *)&dstmac[2],
(unsigned int *)&dstmac[3], (unsigned int *)&dstmac[4],
(unsigned int *)&dstmac[5]);
else
dmac = NULL;
}
if ((p = thc_pcap_init_promisc(interface, string)) == NULL) {
fprintf(stderr, "Error: could not capture on interface %s with string %s\n",
interface, string);
exit(-1);
}
if ((pkt1 = thc_create_ipv6_extended(interface, PREFER_LINK, &pkt1_len, src6,
dst6, ttl, 0, 0, 0, 0)) == NULL)
return -1;
memset(buf, 0, sizeof(buf));
buf[0] = 5;
buf[1] = 2;
if (thc_add_hdr_hopbyhop(pkt1, &pkt1_len, buf, 6) < 0) return -1;
memset(buf, 0, sizeof(buf));
if (mode == ICMP6_MLD_QUERY) {
memcpy(buf, multicast6, 16);
buf[16] = 7;
buf[17] = 120;
} else {
buf[0] = actionmode;
memcpy(buf + 4, multicast6, 16);
if (target6 != NULL) {
buf[3] = 1;
memcpy(buf + 20, target6, 16);
}
}
if (thc_add_icmp6(pkt1, &pkt1_len, mode, 0, wait, (unsigned char *)&buf,
buflen, 0) < 0)
return -1;
if (thc_generate_pkt(interface, mac, dmac, pkt1, &pkt1_len) < 0) {
fprintf(stderr, "Error: Can not generate packet, exiting ...\n");
exit(-1);
}
printf("Sending packet%s for %s%s\n", loop ? "s" : "", empty ? "::" : argv[3],
loop ? " (Press Control-C to end)" : "");
do {
thc_send_pkt(interface, pkt1, &pkt1_len);
if (mode == ICMP6_MLD_QUERY) {
sleep(5);
while (thc_pcap_check(p, (char *)check_packets, NULL))
;
}
} while (loop);
return 0; // never reached
}