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trace6.c
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trace6.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 <netdb.h>
#include <pcap.h>
#include "thc-ipv6.h"
#define MAX_SEND 15
#define INCREASE 8
#define SENDS 3
#define POS_SIZE ((SENDS * MAX_SEND) + 2)
unsigned char *position[POS_SIZE];
unsigned char *remark[POS_SIZE];
unsigned int rmtu[POS_SIZE];
unsigned char buf2[4];
unsigned short int baseport = 1200;
unsigned int pid = 0;
unsigned int mtu = 0;
unsigned int orig_mtu = 0;
int udp = 0, offset = 48, buf_len = 16, tunnel = 0, do_alert = 0, do_reply = 0, do_toobig = 0, do_frag = 0, do_dst = 0, do_dst2 = 0;
int up_to = MAX_SEND, complete = 0, type = 0, rawmode = 0, finaldst = 0;
void help(char *prg) {
printf("%s %s (c) 2019 by %s %s\n\n", prg, VERSION, AUTHOR, RESOURCE);
printf("Syntax: %s [-abdtu] [-s src6] interface targetaddress [port]\n\n", prg);
printf("Options:\n");
printf(" -a insert a hop-by-hop header with router alert option.\n");
printf(" -D insert a destination extension header\n");
printf(" -E insert a destination extension header with an invalid option\n");
printf(" -F insert a one-shot fragmentation header\n");
printf(" -b instead of an ICMP6 Ping, use TooBig (you will not see the target)\n");
printf(" -B instead of an ICMP6 Ping, use PingReply (you will not see the target)\n");
printf(" -d resolves the IPv6 addresses to DNS.\n");
printf(" -t enables tunnel detection\n");
printf(" -u use UDP instead of TCP if a port is supplied\n");
printf(" -r raw mode (for adapters networks that have no ethernet)\n");
printf(" -s src6 specifies the source IPv6 address\n");
printf("Maximum hop reach: %d\n\n", INCREASE * (SENDS - 1) + MAX_SEND);
printf("A basic but very fast traceroute6 program.\n");
printf("If no port is specified, ICMP6 Ping requests are used, otherwise TCP SYN\n");
printf("packets to the specified port. Options D, E and F can be use multiple times.\n");
exit(-1);
}
void check_packets(u_char *foo, const struct pcap_pkthdr *header, const unsigned char *data) {
int i, ok = 0, len = header->caplen, add, add2;
unsigned char *ptr = (unsigned char *) data, *ptr2;
unsigned short int *si;
unsigned int *ui, new_mtu = 0;
unsigned char pos = 0, pos2;
if (!rawmode) {
ptr += 14;
len -= 14;
}
if (do_hdr_size) {
ptr += (do_hdr_size - 14);
len -= (do_hdr_size - 14);
if ((ptr[0] & 240) != 0x60)
return;
}
add = do_alert + do_frag + do_dst;
add2 = do_alert + do_dst;
if (debug)
thc_dump_data(ptr, len, "Received Packet");
complete = 0;
if (tunnel && ptr[6] == NXT_ICMP6 && ptr[40] == ICMP6_TOOBIG && len >= 100) {
new_mtu = (ptr[44] << 24) + (ptr[45] << 16) + (ptr[46] << 8) + ptr[47];
if (new_mtu < mtu) {
if (type != 2) {
pos = ptr[94 + 8 * (add)];
pos2 = ptr[93 + 8 * (add)];
if (pos != pos2 || pos > up_to) {
pos = ptr[94 + 8 * (add2)];
pos2 = ptr[93 + 8 * (add2)];
}
} else {
pos = ptr[101 + 0x30 + 8 * (add + do_toobig - 1)];
pos2 = ptr[100 + 0x30 + 8 * (add + do_toobig - 1)];
}
if (pos == pos2 && pos <= up_to) {
rmtu[pos - 1] = new_mtu;
mtu = new_mtu;
buf_len = mtu - offset;
}
}
}
if (type != 1) {
if (ptr[6] != NXT_ICMP6)
return;
if (ptr[40] == ICMP6_PINGREPLY) {
ptr2 = ptr + 48;
if (memcmp(ptr + 48, buf2, 4) != 0) // from a different process?
return;
pos = ptr[46];
if (position[pos] != NULL && pos <= up_to && pos == ptr[45]) {
if (position[pos] != NULL) {
position[pos] = thc_ipv62notation(ptr + 8);
remark[pos] = strdup("\t[ping reply received]");
}
position[pos + 1] = NULL;
finaldst = 1;
}
} else {
// now for the error icmp types
if (type == 0)
ptr2 = ptr + 96 + 8 * (add);
else
ptr2 = ptr + 104 + 0x30 + 8 * (add);
if (memcmp(ptr2, buf2, 4) != 0) // from a different process?
return;
if (ptr[40] == ICMP6_TTLEXEED && ptr[41] == 0 && len >= 100) {
if (type == 0) {
pos = ptr[94 + 8 * (add)];
pos2 = ptr[93 + 8 * (add)];
if (pos != pos2 || pos > up_to) {
pos = ptr[94 + 8 * (add2)];
pos2 = ptr[93 + 8 * (add2)];
}
//printf("Exceed from %s\n", thc_ipv62notation(ptr + 8));
//printf(" POS1 is : 94 + 8*(add) = [%d] <= %d ?\n", pos, up_to);
//printf(" POS2 is : 93 + 8*(add) = [%d] <= %d ?\n", pos2, up_to);
} else {
pos = ptr[101 + 0x30 + 8 * (add + do_toobig - 1)];
pos2 = ptr[100 + 0x30 + 8 * (add + do_toobig - 1)];
}
//printf("%d == %d < %d\n", pos, pos2, up_to);
if (pos == pos2 && pos <= up_to)
position[pos] = thc_ipv62notation(ptr + 8);
}
if (ptr[40] == ICMP6_UNREACH) {
if (type == 0) {
pos = ptr[94 + 8 * (add)];
pos2 = ptr[93 + 8 * (add)];
if (pos != pos2 || pos > up_to) {
pos = ptr[94 + 8 * (add2)];
pos2 = ptr[93 + 8 * (add2)];
}
} else {
pos = ptr[101 + 0x30 + 8 * (add + do_toobig - 1)];
pos2 = ptr[100 + 0x30 + 8 * (add + do_toobig - 1)];
}
if (pos == pos2 && pos <= up_to) {
if (position[pos] != NULL) {
position[pos] = thc_ipv62notation(ptr + 8);
remark[pos] = strdup("\t[unreachable message received]");
}
// if (position[pos + 1][0] == '?')
position[pos + 1] = NULL;
}
}
if (do_dst2 == 1 && ptr[40] == ICMP6_PARAMPROB) {
if (type == 0) {
pos = ptr[94 + 8 * (add)];
pos2 = ptr[93 + 8 * (add)];
if (pos != pos2 || pos > up_to) {
pos = ptr[94 + 8 * (add2)];
pos2 = ptr[93 + 8 * (add2)];
}
} else {
pos = ptr[101 + 0x30 + 8 * (add + do_toobig - 1)];
pos2 = ptr[100 + 0x30 + 8 * (add + do_toobig - 1)];
}
//thc_dump_data(ptr, len, "pkt");
//printf("type: %d, pos %d, pos2 %d\n", type, pos, pos2);
if (pos == pos2 && pos <= up_to) {
if (position[pos] != NULL) {
position[pos] = thc_ipv62notation(ptr + 8);
remark[pos] = strdup("\t[parameter problem received]");
}
// if (position[pos + 1][0] == '?')
position[pos + 1] = NULL;
finaldst = 1;
}
}
}
} else {
if (ptr[6] != NXT_ICMP6 && ((udp == 0 && ptr[6] != NXT_TCP) || (udp == 1 && ptr[6] != NXT_UDP)))
return;
if (ptr[6] == NXT_TCP) {
si = (unsigned short int *) &ptr[42];
pos = htons((*si % 65536)) - baseport;
ui = (unsigned int *) &ptr[48];
if ((pid + 1) != htonl(*ui))
return;
if (position[pos] != NULL && pos <= up_to) {
position[pos] = thc_ipv62notation(ptr + 8);
i = ptr[53] & 6;
switch (i) {
case 2:
remark[pos] = strdup("\t[TCP SYN-ACK reply received]");
break;
case 4:
remark[pos] = strdup("\t[TCP RST reply received]");
break;
default:
remark[pos] = strdup("\t[TCP unknown reply received]");
}
position[pos + 1] = NULL;
finaldst = 1;
}
}
if (ptr[6] == NXT_UDP) {
si = (unsigned short int *) &ptr[42];
pos = htons((*si % 65536)) - baseport;
if (position[pos] != NULL && pos <= up_to) {
position[pos] = thc_ipv62notation(ptr + 8);
remark[pos] = strdup("\t[UDP reply received]");
position[pos + 1] = NULL;
finaldst = 1;
}
}
if (ptr[6] == NXT_ICMP6 && ptr[40] == ICMP6_TTLEXEED && ptr[41] == 0 && len >= 100) {
si = (unsigned short int *) &ptr[88 + 8 * (add)];
ui = (unsigned int *) &ptr[92 + 8 * (add)];
pos = htons((*si % 65536)) - baseport;
if (pid != htonl(*ui))
return;
if (pos <= up_to)
position[pos] = thc_ipv62notation(ptr + 8);
}
if (ptr[6] == NXT_ICMP6 && ptr[40] == ICMP6_UNREACH && len >= 100) {
si = (unsigned short int *) &ptr[88 + 8 * (add)];
ui = (unsigned int *) &ptr[92 + 8 * (add)];
pos = htons((*si % 65536)) - baseport;
if (pid != htonl(*ui))
return;
if (pos <= up_to) {
if (position[pos] != NULL) {
position[pos] = thc_ipv62notation(ptr + 8);
if (udp && ptr[41] == 4) {
remark[pos] = strdup("\t[port unreachable message received]");
position[pos + 1] = NULL;
finaldst = 1;
} else
remark[pos] = strdup("\t[unreachable message received]");
}
//if (position[pos + 1][0] == '?')
position[pos + 1] = NULL;
}
}
}
for (i = 1; i <= up_to && position[i] != NULL; i++) {
if (position[i][0] != '?')
ok++;
if (position[ok + 1] == NULL)
complete = 1;
}
}
int main(int argc, char *argv[]) {
unsigned char *pkt = NULL, *pkt2 = NULL, foomac[6];
unsigned char *dst6, *src6 = NULL, foo6[16], *mac = NULL, string[64] = "ip6 and dst ";
int pkt_len = 0, pkt2_len = 0, i, k, m, dport = 0, resolve = 0, notreached = 0;
unsigned int j;
struct hostent *he;
unsigned char *interface, *srcmac, *buf = NULL, dummy[4] = "???", text[120], buf3[6];
time_t passed;
pcap_t *p;
thc_ipv6_hdr *ipv6;
if (argc < 3 || strncmp(argv[1], "-h", 2) == 0)
help(argv[0]);
while ((i = getopt(argc, argv, "abBdtrus:FDEX")) >= 0) {
switch (i) {
case 'd':
resolve = 1;
break;
case 'X':
debug = 1;
break;
case 'a':
do_alert = 1;
break;
case 'b':
do_toobig++;
type = 2;
break;
case 'B':
do_reply++;
type = 2;
break;
case 'r':
thc_ipv6_rawmode(1);
rawmode = 1;
break;
case 't':
tunnel = 1;
break;
case 'u':
udp = 1;
break;
case 's':
src6 = thc_resolve6(optarg);
break;
case 'F':
do_frag++;
break;
case 'E':
do_dst++;
do_dst2 = 1;
break;
case 'D':
do_dst++;
break;
default:
fprintf(stderr, "Error: invalid option %c\n", i);
exit(-1);
}
}
if (argc - optind < 2)
help(argv[0]);
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);
interface = argv[optind];
if ((dst6 = thc_resolve6(argv[optind + 1])) == NULL) {
fprintf(stderr, "Error: can not resolve %s\n", argv[optind + 1]);
exit(-1);
}
if (src6 == NULL)
src6 = thc_get_own_ipv6(interface, dst6, PREFER_GLOBAL);
srcmac = thc_get_own_mac(interface);
up_to = MAX_SEND;
if (do_reply)
do_toobig = 0;
if (argc - optind >= 3 && argv[optind + 2] != NULL) {
if (type) {
fprintf(stderr, "Error: you can not use option -b and specify a target TCP port together\n");
exit(-1);
}
type = 1;
dport = atoi(argv[optind + 2]);
if (dport < 0 || dport > 65535) {
fprintf(stderr, "Error: port (3rd option) is invalid: %s\n", argv[optind + 2]);
exit(-1);
}
}
if (src6 == NULL || srcmac == NULL) {
fprintf(stderr, "Error: interface not valid: %s!\n", interface);
exit(-1);
}
if (rawmode == 0 && (mac = thc_get_mac(interface, src6, dst6)) == NULL) {
fprintf(stderr, "ERROR: Can not resolve mac address for %s\n", argv[optind + 1]);
exit(-1);
}
strcat(string, thc_ipv62notation(src6));
for (i = 0; i < POS_SIZE; i++) {
position[i] = dummy;
remark[i] = strdup("");
rmtu[i] = 0;
}
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 ((mtu = thc_get_mtu(interface)) < 1280) {
fprintf(stderr, "Error: invalid MTU (< 1280) on %s: %d\n", interface, mtu);
exit(-1);
}
if ((buf = malloc(mtu + 128)) == NULL) {
perror("malloc");
exit(-1);
}
memset(buf, 0, mtu);
if (tunnel) {
if (type == 1)
offset += 12;
if (do_hdr_size)
offset += do_hdr_size;
orig_mtu = mtu;
buf_len = mtu - offset;
if (do_alert)
buf_len -= 8;
}
if (do_alert) {
memset(buf3, 0, sizeof(buf3));
buf3[0] = 5;
buf3[1] = 2;
}
while (thc_pcap_check(p, (char *) check_packets, NULL) > 0);
if (type == 1) {
baseport += getpid() % 60000;
pid = (getpid() << 16) + getpid();
if (tunnel == 0)
buf_len = 0;
} else {
buf2[0] = getpid() / 256;
buf2[1] = getpid() % 256;
buf2[2] = buf[0];
buf2[3] = buf[1];
for (m = 0; m < (mtu / 4); m++)
memcpy(buf + (m * 4), buf2, 4);
}
for (k = 0; k < SENDS; k++) {
if (complete == 0) {
for (i = 1; i <= up_to; i++) {
if (position[i] != NULL && position[i][0] == '?') {
if (type != 1)
memset((char *) &j, i % 256, 4);
if ((pkt = thc_create_ipv6_extended(interface, PREFER_GLOBAL, &pkt_len, src6, dst6, i, 0, 0, 0, 0)) == NULL)
return -1;
if (do_alert)
if (thc_add_hdr_hopbyhop(pkt, &pkt_len, buf3, 6) < 0)
return -1;
if (type != 2) {
if (do_frag)
for (m = 0; m < do_frag; m++)
if (thc_add_hdr_oneshotfragment(pkt, &pkt_len, getpid() + m) < 0)
return -1;
if (do_dst) {
memset(buf3, 0, 6);
if (do_dst2) {
buf3[0] = NXT_INVALID;
buf3[1] = 1;
}
for (m = 0; m < do_dst; m++)
if (thc_add_hdr_dst(pkt, &pkt_len, buf3, 6) < 0)
return -1;
}
}
if (type == 0) {
if (thc_add_icmp6(pkt, &pkt_len, ICMP6_PINGREQUEST, 0, j, (unsigned char *) buf, buf_len, 0) < 0)
return -1;
} else {
if (type == 2) {
memset(foomac, 0xff, sizeof(foomac));
memcpy(foo6, src6, 16);
m = 1500 - 40 - 8;
if (foo6[8])
foo6[8] = 0;
else
foo6[8] = 1;
if ((pkt2 = thc_create_ipv6_extended(interface, 0, &pkt2_len, dst6, foo6, i, 0, 0, 0, 0)) == NULL)
return -1;
if (thc_add_icmp6(pkt2, &pkt2_len, ICMP6_PINGREQUEST, 0, j, (unsigned char *) buf, m, 0) < 0)
return -1;
thc_generate_pkt(interface, foomac, foomac, pkt2, &pkt2_len);
ipv6 = (thc_ipv6_hdr *) pkt2;
for (m = 0; m < do_toobig + do_frag; m++)
if (thc_add_hdr_oneshotfragment(pkt, &pkt_len, getpid()) < 0)
return -1;
if (do_dst) {
memset(buf3, 0, 6);
for (m = 0; m < do_dst; m++)
if (thc_add_hdr_dst(pkt, &pkt_len, buf3, 6) < 0)
return -1;
}
if (do_hdr_size)
m = do_hdr_size;
else
m = 14;
if (do_reply) {
if (thc_add_icmp6(pkt, &pkt_len, ICMP6_PINGREPLY, 0, 1480, (unsigned char *) ipv6->pkt + m, 1280 - 40 - 8 - 8, 0) < 0)
return -1;
} else if (thc_add_icmp6(pkt, &pkt_len, ICMP6_TOOBIG, 0, 1480, (unsigned char *) ipv6->pkt + m, 1280 - 40 - 8 - 8, 0) < 0)
return -1;
pkt2 = thc_destroy_packet(pkt2);
} else if (udp) {
if (thc_add_udp(pkt, &pkt_len, baseport + i, dport, 0, buf_len > 0 ? buf : NULL, buf_len) < 0)
return -1;
} else if (thc_add_tcp(pkt, &pkt_len, baseport + i, dport, pid, 0, TCP_SYN, 5760, 0, NULL, 0, buf_len > 0 ? buf : NULL, buf_len) < 0)
return -1;
}
if (thc_generate_and_send_pkt(interface, srcmac, mac, pkt, &pkt_len) < 0) {
fprintf(stderr, "Error: Can not send packet, exiting ...\n");
exit(-1);
}
pkt = thc_destroy_packet(pkt);
usleep(1000);
} else if (position[i] == NULL)
up_to = i - 1;
}
}
passed = time(NULL);
while (passed + k >= time(NULL) && complete == 0)
thc_pcap_check(p, (char *) check_packets, NULL);
if (complete == 0 && finaldst == 0 && k + 1 < SENDS && up_to >= MAX_SEND && position[up_to] != NULL /*&& position[up_to][0] != '?' */ ) {
if (debug)
printf("DEBUG: increasing range from %d to %d\n", up_to, up_to + INCREASE);
up_to += INCREASE;
}
if (debug)
printf("DEBUG: run %d of %d, complete %d, range %d\n", k, SENDS, complete, up_to);
}
thc_pcap_close(p);
j = 0;
for (i = 1; i <= up_to && position[i] != NULL; i++)
if (position[i][0] == '?')
j++;
else
j = 0;
if (j > 0) {
up_to -= (j - 1);
position[up_to] = strdup("!!!");
notreached = 1;
}
j = 0;
for (i = 1; i <= up_to && position[i] != NULL; i++)
if (position[i][0] != '?')
j++;
if (j == 0) {
printf("Trace6 for %s unsuccessful, no packets received.\n", argv[optind + 1]);
} else {
if (tunnel) {
snprintf(text, sizeof(text), " with starting MTU %d", orig_mtu);
mtu = orig_mtu;
} else
text[0] = 0;
printf("Trace6 for %s (%s)%s:\n", argv[optind + 1], thc_ipv62notation(dst6), text);
j = 0;
for (i = 0; i <= up_to; i++)
if (position[i] == NULL && j == -1)
j = i;
if (j > 0)
up_to = j;
for (i = 1; i <= up_to && position[i] != NULL; i++) {
if (tunnel && rmtu[i] > 0 && mtu > rmtu[i]) {
if (mtu - rmtu[i] < 8)
snprintf(text, sizeof(text), " - new MTU %d", rmtu[i]);
else if (mtu - rmtu[i] == 20)
snprintf(text, sizeof(text), " - new MTU %d - 6in4 tunnel endpoint", rmtu[i]);
else if (mtu - rmtu[i] == 28 || mtu - rmtu[i] == 36 || mtu - rmtu[i] == 8 || mtu - rmtu[i] == 16)
snprintf(text, sizeof(text), " - new MTU %d - PPP or Teredo tunnel endpoint", rmtu[i]);
else if (mtu - rmtu[i] == 64)
snprintf(text, sizeof(text), " - new MTU %d - PPTP tunnel endpoint", rmtu[i]);
else if (mtu - rmtu[i] == 80)
snprintf(text, sizeof(text), " - new MTU %d - AYIYA tunnel endpoint", rmtu[i]);
else if (mtu - rmtu[i] > 80)
snprintf(text, sizeof(text), " - new MTU %d", rmtu[i]);
else
snprintf(text, sizeof(text), " - new MTU %d", rmtu[i]);
mtu = rmtu[i];
} else
text[0] = 0;
if (resolve && position[i][0] != '?' && position[i][0] != '!') {
//printf("foo %p\n", position[i]);
he = gethostbyaddr(thc_resolve6(position[i]), 16, AF_INET6);
printf(" %2d: %s (%s)%s%s\n", i, position[i], he != NULL ? he->h_name : "", remark[i], text);
} else
printf(" %2d: %s%s%s\n", i, position[i], remark[i], text);
}
printf("\n");
}
if (notreached) {
if (do_toobig)
printf("With the -b TooBig option, the destination will not send a reply\n");
else
printf("The destination seems to be filtered.\n");
}
return 0;
}