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thcping6.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 <sys/timeb.h>
#include <ctype.h>
#include <arpa/inet.h>
#include "thc-ipv6.h"
struct timespec ts, ts2;
int dlen = -1, port = 0, done = 0, resp_type = -1, type = NXT_ICMP6,
fastopen = 0, client = 0, waitms = 1000000, fill = 1, notfound = 1,
count = 1;
unsigned int sent = 0;
extern int do_pppoe;
extern int do_hdr_off;
extern int do_6in4;
extern int do_hdr_vlan;
void help(char *prg, int help) {
printf("%s %s (c) 2022 by %s %s\n\n", prg, VERSION, AUTHOR, RESOURCE);
printf(
"Syntax: %s [-EafqxO] [-e ethertype] [-H t:l:v] [-D t:l:v] [-F dst] [-e "
"ethertype] [-L length] [-N nextheader] [-V version] [-t ttl] [-c class] "
"[-l label] [-d size] [-S port|-U port|-T type -C code] interface src6 "
"dst6 [srcmac [dstmac [data]]]\n\n",
prg);
printf("Options:\n");
if (help) {
printf(" -x flood mode (doesn't check for replies)\n");
printf(
" -w ms wait time between packets in ms (default: 1000, if "
"-n not 1)\n");
printf(
" -a add a hop-by-hop header with router alert "
"option.\n");
printf(
" -q add a hop-by-hop header with quickstart option.\n");
printf(" -E send as ethertype IPv4\n");
printf(" -e ethertype send as specified ethertype (hexadecimal!)\n");
printf(" -H t:l:v add a hop-by-hop header with special content\n");
printf(" -D t:l:v add a destination header with special content\n");
printf(
" -D \"xxx\" add a large destination header which fragments "
"the packet\n");
printf(" -f add a one-shot fragementation header\n");
printf(" -F ipv6address use source routing to this final destination\n");
printf(" -t ttl specify TTL (default: 255)\n");
printf(" -c class specify a class (0-4095)\n");
printf(" -l label specify a label (0-1048575)\n");
printf(" -L length set fake payload length (0-65535)\n");
printf(" -N nextheader set fake next header (0-255)\n");
printf(" -V version set IP version (0-15)\n");
printf(" -d data_size define the size of the ping data buffer\n");
printf(
" -O send TCP Fast Open cookie request option (needs "
"-S)\n");
}
printf(" -T number ICMPv6 type to send (default: 128 = ping)\n");
printf(" -C number ICMPv6 code to send (default: 0)\n");
printf(
" -S port use a TCP SYN packet on the defined port instead of "
"ping\n");
printf(
" -U port use a UDP packet on the defined port instead of "
"ping\n");
printf(" -n count how often to send the packet (default: 1)\n");
if (help) {
printf("t:l:v syntax: type:length:value, value is in hex, e.g. 1:2:0eab\n");
} else {
printf(" -h show more command line options (help!)\n");
}
printf(
"You can put an \"x\" into src6, srcmac and dstmac for an automatic "
"value.\n");
printf(
"\nCraft a ICMPv6/TCP/UDP packet with special IPv6 or EH header "
"options.\n");
printf(
"Returns -1 on error or no reply, 0 on normal reply or 1 on error "
"reply.\n");
exit(-1);
}
void alarming() {
if (done == 0) printf("No packet received, terminating.\n");
exit(resp_type);
}
void check_packets(u_char *pingdata, const struct pcap_pkthdr *header,
const unsigned char *data) {
int len = header->caplen - 14, min = 0, ok = 0, nxt = 6, offset = 0, olen, i;
long usec, fragid;
unsigned int mtu = 0;
unsigned char *ptr = (unsigned char *)(data + 14), frag[64] = "";
if (do_hdr_size) {
ptr = (unsigned char *)(data + do_hdr_size);
len = (header->caplen - do_hdr_size);
if ((ptr[0] & 240) != 0x60) return;
}
clock_gettime(CLOCK_REALTIME, &ts2);
if (ts2.tv_nsec < ts.tv_nsec) {
min = 1;
usec = (int)((1000000000 - ts.tv_nsec + ts2.tv_nsec) / 1000000);
// usec = (int) ((1000000000 - ts.tv_nsec + ts2.tv_nsec) / 10000);
} else
usec = (unsigned long int)((ts2.tv_nsec - ts.tv_nsec) / 1000000);
// usec = (int) ((ts2.tv_nsec - ts.tv_nsec) / 10000);
if (ptr[nxt] == NXT_FRAG) {
offset += 8;
nxt = 40;
fragid = ((unsigned char)ptr[44] << 24) + ((unsigned char)ptr[45] << 16) +
((unsigned char)ptr[46] << 8) + (unsigned char)ptr[47];
sprintf(frag, " (fragmented: 0x%08lx)", fragid);
}
if (ptr[nxt] == NXT_ICMP6) {
if (len < 44 + offset || ((len + 44 + offset) < dlen && dlen < 1000) ||
(len + offset < 986 && dlen > 900)) {
if (debug) printf("ignoring too short packet\n");
return;
}
if (dlen < 1000) {
if (memcmp(pingdata, ptr + len - dlen, dlen) == 0) ok = 1;
} else {
if (memcmp(pingdata, ptr + 256 + offset, 100) == 0 ||
memcmp(pingdata, ptr + 260, 100) == 0 ||
memcmp(pingdata, ptr + 242, 100) == 0 ||
memcmp(pingdata, data + 260 + offset, 100) == 0)
ok = 1;
}
if (ok) {
printf("%04u.%03ld \t", (int)(ts2.tv_sec - ts.tv_sec - min), usec);
switch (ptr[40 + offset]) {
case ICMP6_PINGREPLY:
if (type == NXT_ICMP6) {
printf("pong");
resp_type = 0;
}
break;
case ICMP6_PARAMPROB:
printf("icmp parameter problem type %d", ptr[41 + offset]);
resp_type = 1;
break;
case ICMP6_REDIR:
printf("icmp redirect");
break;
case ICMP6_UNREACH:
printf("icmp unreachable type %d", ptr[41 + offset]);
resp_type = 1;
break;
case ICMP6_TOOBIG:
mtu = (ptr[44 + offset] << 24) + (ptr[45 + offset] << 16) +
(ptr[46 + offset] << 8) + ptr[47 + offset];
printf("icmp too big (max mtu: %d)", mtu);
resp_type = 1;
break;
case ICMP6_TTLEXEED:
printf("icmp ttl exceeded");
resp_type = 1;
break;
case ICMP6_PINGREQUEST:
printf("own ping seen (ignore this)\n");
resp_type = -1;
break;
default:
// ignored
printf("icmp6 %d:%d", ptr[40 + offset], ptr[41 + offset]);
resp_type = 0;
}
if (fill) printf(" for seq=%u", sent);
printf("\n");
} else
printf(
"(ignoring icmp6 packet with different contents (proto %d, type %d, "
"code %d)) ",
ptr[nxt], ptr[40 + offset], ptr[41 + offset]);
} else {
if (type == NXT_TCP && ptr[nxt] == NXT_TCP) {
printf("%04u.%03ld \ttcp-", (int)(ts2.tv_sec - ts.tv_sec - min), usec);
switch ((ptr[53 + offset] % 8)) {
case 2:
if (ptr[53 + offset] >= TCP_ACK) {
printf("syn-ack");
resp_type = 0;
} else {
printf("syn (double?)");
resp_type = 1;
}
break;
case 4:
printf("rst");
resp_type = 1;
break;
default:
printf("illegal");
resp_type = 1;
break;
}
if (fill) printf(" for seq=%u", sent);
if (fastopen && len > 62 + offset) {
if (ptr[60 + offset] == 23) {
olen = ptr[61 + offset];
if (len < olen + 62 + offset) olen = len - 62 - offset;
printf(" TCP Fast Open cookie: ");
for (i = 0; i < olen; i++)
printf("%02x", (unsigned char)ptr[62 + offset + i]);
} else
printf(" (no fast open reply)");
}
} else if (type == NXT_UDP && ptr[nxt] == NXT_UDP)
printf("%04u.%03ld \tudp", (int)(ts2.tv_sec - ts.tv_sec - min), usec);
}
if (resp_type >= 0)
printf(" packet received from %s%s\n", thc_ipv62notation(ptr + 8), frag);
if (done == 0 && resp_type >= 0) {
done = 1;
if (count == 1) {
alarm(1);
notfound = 0;
}
}
}
int main(int argc, char *argv[]) {
unsigned char *pkt1 = NULL, buf[2096] = "thcping6", *routers[2],
buf2[1300] = "";
unsigned char *src6 = NULL, *dst6 = NULL, smac[16] = "", dmac[16] = "",
*srcmac = smac, *dstmac = dmac;
char string[256] = "ip6 and dst ", *interface, *d_opt = NULL, *h_opt = NULL,
*oo, *ol, *ov;
int pkt1_len = 0, flags = 0, frag = 0, alert = 0, quick = 0, route = 0,
ttl = 255, label = 0, class = 0, i, j, k, ether = -1, xl = 0,
frag_type = NXT_ICMP6, offset = 14, icmptype = ICMP6_PINGREQUEST,
icmpcode = 0, flood = 0, fake_len = -1, fake_ver = 0, fake_nxt = -1,
olen = 0;
pcap_t * p = NULL;
thc_ipv6_hdr *hdr;
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);
if (argc > 1 && strncmp(argv[1], "-h", 2) == 0) help(argv[0], 1);
if (argc < 3) help(argv[0], 0);
memset(buf, 0, sizeof(buf));
while ((i = getopt(argc, argv,
"w:aqfd:D:H:xF:t:c:l:OS:U:EXn:T:C:e:L:N:V:")) >= 0) {
switch (i) {
case 'e':
if (strncmp(optarg, "0x", 2) == 0)
sscanf(optarg + 2, "%x", (int *)ðer);
else
sscanf(optarg, "%x", (int *)ðer);
break;
case 'w':
waitms = atoi(optarg) * 1000;
break;
case 'O':
fastopen = 1;
break;
case 'L':
fake_len = atoi(optarg);
break;
case 'N':
fake_nxt = atoi(optarg);
break;
case 'V':
fake_ver = atoi(optarg);
break;
case 'T':
icmptype = atoi(optarg);
break;
case 'C':
icmpcode = atoi(optarg);
break;
case 'X':
debug = 1;
break;
case 'x':
flood = 1;
break;
case 'a':
alert = 1;
break;
case 'q':
quick = 1;
break;
case 'f':
frag++;
break;
case 'E':
ether = 0x0800;
break;
case 'F':
route = 1;
if ((routers[0] = thc_resolve6(optarg)) == NULL) {
fprintf(stderr,
"Error: %s does not resolve to a valid IPv6 address\n",
optarg);
exit(-1);
}
routers[1] = NULL;
break;
case 'S':
port = atoi(optarg);
type = NXT_TCP;
break;
case 'U':
port = atoi(optarg);
type = NXT_UDP;
break;
case 'D':
d_opt = optarg;
break;
case 'H':
h_opt = optarg;
break;
case 't':
ttl = atoi(optarg);
break;
case 'c':
class = atoi(optarg);
break;
case 'l':
label = atoi(optarg);
break;
case 'n':
count = atoi(optarg);
if (count == 0) count = -1;
break;
case 'd':
dlen = atoi(optarg);
fill = 0;
if (dlen > 2096) dlen = 2096;
for (j = 0; j < (dlen / 8); j++)
memcpy(buf + j * 8, "thcping6", 8);
break;
default:
fprintf(stderr, "Error: invalid option %c\n", i);
exit(-1);
}
}
if (argc - optind < 2) help(argv[0], 0);
if (dlen == -1) {
if (type == NXT_TCP)
dlen = 0;
else {
dlen = 8;
memset(buf, 0, sizeof(buf));
}
}
if (port < 1024 && (type == NXT_TCP || type == NXT_UDP)) client = 1024;
if (fastopen && type != NXT_TCP) {
fprintf(stderr,
"Error: TCP Fast Open option (-O) requires sendig TCP SYN packets "
"(-S)\n");
exit(-1);
}
if (do_hdr_size) offset = do_hdr_size;
interface = argv[optind];
if (argc - optind == 2) {
dst6 = thc_resolve6(argv[optind + 1]);
if ((src6 = thc_get_own_ipv6(interface, dst6, PREFER_GLOBAL)) == NULL) {
fprintf(stderr, "Error: no IPv6 address found for interface %s!\n",
interface);
exit(-1);
}
} else {
dst6 = thc_resolve6(argv[optind + 2]);
if (strcmp(argv[optind + 1], "x") != 0)
src6 = thc_resolve6(argv[optind + 1]);
else if ((src6 = thc_get_own_ipv6(interface, dst6, PREFER_GLOBAL)) ==
NULL) {
fprintf(stderr, "Error: no IPv6 address found for interface %s!\n",
interface);
exit(-1);
}
}
if (thc_get_own_ipv6(interface, NULL, PREFER_GLOBAL) == NULL) {
fprintf(stderr, "Error: invalid interface %s\n", interface);
exit(-1);
}
strcat(string, thc_ipv62notation(src6));
if (argc - optind >= 4) {
if (strcmp(argv[optind + 3], "x") != 0)
sscanf(argv[optind + 3], "%x:%x:%x:%x:%x:%x", (unsigned int *)&smac[0],
(unsigned int *)&smac[1], (unsigned int *)&smac[2],
(unsigned int *)&smac[3], (unsigned int *)&smac[4],
(unsigned int *)&smac[5]);
else
srcmac = NULL;
} else
srcmac = NULL;
if (argc - optind >= 5) {
if (strcmp(argv[optind + 4], "x") != 0)
sscanf(argv[optind + 4], "%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]);
else
dstmac = NULL;
} else
dstmac = NULL;
do {
sent++;
done = 0;
if ((pkt1 = thc_create_ipv6_extended(interface, PREFER_GLOBAL, &pkt1_len,
src6, dst6, ttl, 0, label, class,
fake_ver)) == NULL)
return -1;
if (alert || quick) {
j = 0;
memset(buf2, 0, sizeof(buf2));
if (alert) {
buf2[0] = 5;
buf2[1] = 2;
j = 4;
}
if (quick) {
buf2[j] = 38;
buf2[j + 1] = 6;
buf2[j + 3] = 255;
j += 8;
}
while ((j + 2) % 8 != 0)
j++;
if (thc_add_hdr_hopbyhop(pkt1, &pkt1_len, buf2, j) < 0) return -1;
frag_type = NXT_HBH;
}
if (h_opt != NULL) {
memset(buf2, 0, sizeof(buf2));
frag_type = NXT_HBH;
oo = h_opt;
if ((ol = index(oo, ':')) == NULL) {
fprintf(stderr,
"Error: option value must be optionnumber:length:value, e.g. "
"1:2:feab -> %s\n",
h_opt);
exit(-1);
}
*ol++ = 0;
if ((ov = index(ol, ':')) == NULL) {
fprintf(stderr,
"Error: option value must be optionnumber:length:value, e.g. "
"1:2:feab -> %s\n",
h_opt);
exit(-1);
}
*ov++ = 0;
buf2[0] = (atoi(oo)) % 256;
buf2[1] = (atoi(ol)) % 256;
if (*ov != 0)
for (i = 0; i < strlen(ov) / 2; i++) {
if (tolower(ov[i * 2]) >= 'a' && tolower(ov[i * 2]) <= 'f')
j = (ov[i * 2] - 'a' + 10) * 16;
else if (ov[i * 2] >= '0' && ov[i * 2] <= '9')
j = (ov[i * 2] - '0') * 16;
else {
fprintf(
stderr,
"Error: only hexadecimal characters are allowed in value: %s\n",
ov);
exit(-1);
}
if (tolower(ov[i * 2 + 1]) >= 'a' && tolower(ov[i * 2 + 1]) <= 'f')
j += (ov[i * 2 + 1] - 'a' + 10);
else if (ov[i * 2 + 1] >= '0' && ov[i * 2 + 1] <= '9')
j += (ov[i * 2 + 1] - '0');
else {
fprintf(
stderr,
"Error: only hexadecimal characters are allowed in value: %s\n",
ov);
exit(-1);
}
buf2[2 + i] = j % 256;
}
if (thc_add_hdr_hopbyhop(pkt1, &pkt1_len, buf2, 2 + (atoi(ol) % 256)) < 0)
return -1;
}
if (frag) {
for (k = 0; k < frag; k++)
if (thc_add_hdr_oneshotfragment(pkt1, &pkt1_len, getpid() + k + flood) <
0)
return -1;
if (frag_type == NXT_DST) frag_type = NXT_FRAG;
}
if (route) {
if (thc_add_hdr_route(pkt1, &pkt1_len, routers, 1) < 0) return -1;
if (frag_type == NXT_DST) frag_type = NXT_ROUTE;
}
if (d_opt != NULL) {
memset(buf2, 0, sizeof(buf2));
if (d_opt[0] == 'x') {
xl = 1;
frag_type = NXT_DST;
if (thc_add_hdr_dst(pkt1, &pkt1_len, buf2, sizeof(buf2)) < 0) return -1;
} else {
oo = d_opt;
if ((ol = index(oo, ':')) == NULL) {
fprintf(stderr,
"Error: option value must be optionnumber:length:value, e.g. "
"1:2:feab: %s\n",
h_opt);
exit(-1);
}
*ol++ = 0;
if ((ov = index(ol, ':')) == NULL) {
fprintf(stderr,
"Error: option value must be optionnumber:length:value, e.g. "
"1:2:feab: %s\n",
h_opt);
exit(-1);
}
*ov++ = 0;
buf2[0] = (atoi(oo)) % 256;
buf2[1] = (atoi(ol)) % 256;
if (*ov != 0)
for (i = 0; i < strlen(ov) / 2; i++) {
if (tolower(ov[i * 2]) >= 'a' && tolower(ov[i * 2]) <= 'f')
j = (ov[i * 2] - 'a' + 10) * 16;
else if (ov[i * 2] >= '0' && ov[i * 2] <= '9')
j = (ov[i * 2] - '0') * 16;
else {
fprintf(stderr,
"Error: only hexadecimal characters are allowed in "
"value: %s\n",
ov);
exit(-1);
}
if (tolower(ov[i * 2 + 1]) >= 'a' && tolower(ov[i * 2 + 1]) <= 'f')
j += (ov[i * 2 + 1] - 'a' + 10);
else if (ov[i * 2 + 1] >= '0' && ov[i * 2 + 1] <= '9')
j += (ov[i * 2 + 1] - '0');
else {
fprintf(stderr,
"Error: only hexadecimal characters are allowed in "
"value: %s\n",
ov);
exit(-1);
}
buf2[2 + i] = j % 256;
}
if (thc_add_hdr_dst(pkt1, &pkt1_len, buf2, 2 + (atoi(ol) % 256)) < 0)
return -1;
}
}
if (argc - optind >= 6) {
if (dlen != 8) {
fprintf(stderr,
"Warning: the data option is ignored if the -d option is "
"supplied\n");
} else {
dlen = strlen(argv[optind + 5]);
if (dlen > sizeof(buf)) dlen = sizeof(buf) - 1;
memcpy(buf, argv[optind + 5], dlen);
buf[dlen] = 0;
fill = 0;
}
}
if ((port == 0 || type == NXT_UDP) && fill)
memcpy(buf, (char *)&sent, sizeof(sent));
if (port == 0) {
if (thc_add_icmp6(pkt1, &pkt1_len, icmptype, icmpcode, flags,
(unsigned char *)&buf, dlen, 0) < 0)
return -1;
} else if (type == NXT_TCP) {
memset(buf2, 0, sizeof(buf2));
if (fastopen) {
memset(buf2, 0, sizeof(buf2));
olen = 4;
buf2[0] = 34;
buf2[1] = 2;
}
if (thc_add_tcp(pkt1, &pkt1_len, port + flood + client, port, sent, 0,
TCP_SYN, 5760, 0, (unsigned char *)&buf2, olen,
(unsigned char *)&buf, dlen) < 0)
return -1;
} else if (thc_add_udp(pkt1, &pkt1_len, port + flood + client, port, 0,
(unsigned char *)&buf, dlen) < 0)
return -1;
if (thc_generate_pkt(interface, srcmac, dstmac, pkt1, &pkt1_len) < 0) {
fprintf(stderr, "Error: Can not generate packet, exiting ...\n");
exit(-1);
}
hdr = (thc_ipv6_hdr *)pkt1;
if (fake_nxt != -1) {
if (do_hdr_size) {
hdr->pkt[6 + do_hdr_size] =
(unsigned char)((unsigned int)fake_nxt % 256);
} else
hdr->pkt[20] = (unsigned char)((unsigned int)fake_nxt % 256);
}
if (fake_len != -1) {
if (do_hdr_size) {
hdr->pkt[4 + do_hdr_size] =
(unsigned char)(((unsigned int)fake_len % 65536) / 256);
hdr->pkt[5 + do_hdr_size] =
(unsigned char)((unsigned int)fake_len % 256);
} else {
hdr->pkt[18] =
(unsigned char)(((unsigned int)fake_len % 65536) /
256); // ethernet protocol value for IPv4
hdr->pkt[19] = (unsigned char)((unsigned int)fake_len % 256);
}
}
if (ether != -1) {
if (do_hdr_size) {
if (do_pppoe) {
hdr->pkt[20 + do_hdr_off] = 0; // PPP protocol value for IPv4
hdr->pkt[21 + do_hdr_off] = 0x21;
} else if (do_hdr_vlan && do_6in4 == 0) {
hdr->pkt[16] = 8; // ethernet protocol value for IPv4
hdr->pkt[17] = 0;
} else
fprintf(stderr,
"Warning: ether option does not work with 6in4 injection\n");
} else {
hdr->pkt[12] =
(unsigned char)(((unsigned int)ether % 65536) /
256); // ethernet protocol value for IPv4
hdr->pkt[13] = (unsigned char)((unsigned int)ether % 256);
}
}
signal(SIGALRM, alarming);
if (p == NULL)
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 (xl || hdr->pkt_len > thc_get_mtu(interface))
// for (i = 0; i < count; i++)
thc_send_as_fragment6(interface, src6, dst6, frag_type,
hdr->pkt + 40 + offset, hdr->pkt_len - 40 - offset,
1280);
else
// for (i = 0; i < count; i++)
while (thc_send_pkt(interface, pkt1, &pkt1_len) < 0)
usleep(1);
clock_gettime(CLOCK_REALTIME, &ts);
if (flood < 2) {
printf("0000.000 \t%s packet sent to %s\n",
port == 0 ? "ping" : type == NXT_TCP ? "tcp-syn" : "udp",
thc_ipv62notation(dst6));
if (flood == 1 && type != NXT_TCP && type != NXT_UDP && frag == 0) {
if (xl)
for (i = 0; i < count; i++)
thc_send_as_fragment6(interface, src6, dst6, frag_type,
hdr->pkt + 40 + offset,
hdr->pkt_len - 40 - offset, 1280);
else
for (i = 0; i < count; i++)
while (thc_send_pkt(interface, pkt1, &pkt1_len) < 0)
usleep(1);
}
}
{
int slices = waitms / 500, counter;
for (counter = 0; counter < slices /*&& done == 0*/; counter++) {
usleep(500);
while (thc_pcap_check(p, (char *)check_packets, buf) > 0)
;
}
}
pkt1 = thc_destroy_packet(pkt1);
if (flood > 0) flood++;
if (count > 0) count--;
} while (flood != 0 || count != 0);
alarm(2);
while (notfound) {
thc_pcap_check(p, (char *)check_packets, buf);
}
return resp_type; // not reached
}