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Add Fake Packet maximum TTL limit to Auto TTL mode

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This patchset adds maximum TTL size of the fake packet to be sent,
to further  improve compatibility with asymmertic routing and
non-standard TTL value set on servers.
This commit is contained in:
ValdikSS 2021-12-29 02:01:51 +03:00
parent 8911e459d8
commit 46c4f36de8
4 changed files with 37 additions and 15 deletions
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5
README.md
View File

@ -36,10 +36,11 @@ Usage: goodbyedpi.exe [OPTION...]
This option can be supplied multiple times.
--set-ttl <value> activate Fake Request Mode and send it with supplied TTL value.
DANGEROUS! May break websites in unexpected ways. Use with care.
--auto-ttl [a1-a2] activate Fake Request Mode, automatically detect TTL and decrease
--auto-ttl [a1-a2-m] activate Fake Request Mode, automatically detect TTL and decrease
it based on a distance. If the distance is shorter than a2, TTL is decreased
by a2. If it's longer, (a1; a2) scale is used with the distance as a weight.
Default (if set): --auto-ttl 1-4, also sets --min-ttl 3.
If the resulting TTL is more than m(ax), set it to m.
Default (if set): --auto-ttl 1-4-10. Also sets --min-ttl 3.
--min-ttl <value> minimum TTL distance (128/64 - TTL) for which to send Fake Request
in --set-ttl and --auto-ttl modes.
--wrong-chksum activate Fake Request Mode and send it with incorrect TCP checksum.

37
src/goodbyedpi.c
View File

@ -110,14 +110,15 @@ WINSOCK_API_LINKAGE INT WSAAPI inet_pton(INT Family, LPCSTR pStringBuf, PVOID pA
TCP_HANDLE_OUTGOING_TTL_PARSE_PACKET_IF() { \
if (do_auto_ttl) { \
/* If Auto TTL mode */ \
ttl_of_fake_packet = tcp_get_auto_ttl(tcp_conn_info.ttl, auto_ttl_1, auto_ttl_2, ttl_min_nhops); \
ttl_of_fake_packet = tcp_get_auto_ttl(tcp_conn_info.ttl, auto_ttl_1, auto_ttl_2, \
ttl_min_nhops, auto_ttl_max); \
if (do_tcp_verb) { \
printf("Connection TTL = %d, Fake TTL = %d\n", tcp_conn_info.ttl, ttl_of_fake_packet); \
} \
} \
else if (ttl_min_nhops) { \
/* If not Auto TTL mode but --min-ttl is set */ \
if (tcp_get_auto_ttl(tcp_conn_info.ttl, 0, 0, ttl_min_nhops)) { \
if (tcp_get_auto_ttl(tcp_conn_info.ttl, 0, 0, ttl_min_nhops, 0)) { \
/* Send only if nhops > min_ttl */ \
should_send_fake = 0; \
} \
@ -552,6 +553,7 @@ int main(int argc, char *argv[]) {
BYTE ttl_min_nhops = 0;
BYTE auto_ttl_1 = 0;
BYTE auto_ttl_2 = 0;
BYTE auto_ttl_max = 0;
uint32_t dnsv4_addr = 0;
struct in6_addr dnsv6_addr = {0};
struct in6_addr dns_temp_addr = {0};
@ -604,7 +606,7 @@ int main(int argc, char *argv[]) {
http_fragment_size = https_fragment_size = 2;
do_fragment_http_persistent = do_fragment_http_persistent_nowait = 1;
do_fake_packet = 1;
do_auto_ttl = 4;
do_auto_ttl = 1;
}
while ((opt = getopt_long(argc, argv, "123456prsaf:e:mwk:n", long_options, NULL)) != -1) {
@ -636,7 +638,7 @@ int main(int argc, char *argv[]) {
http_fragment_size = https_fragment_size = 2;
do_fragment_http_persistent = do_fragment_http_persistent_nowait = 1;
do_fake_packet = 1;
do_auto_ttl = 4;
do_auto_ttl = 1;
break;
case '6':
do_fragment_http = do_fragment_https = 1;
@ -796,6 +798,12 @@ int main(int argc, char *argv[]) {
exit(EXIT_FAILURE);
}
auto_ttl_2 = atoub(autottl_current, "Set Auto TTL parameter error!");
autottl_current = strtok(NULL, "-");
if (!autottl_current) {
puts("Set Auto TTL parameter error!");
exit(EXIT_FAILURE);
}
auto_ttl_max = atoub(autottl_current, "Set Auto TTL parameter error!");
}
else {
// single digit parser
@ -847,11 +855,13 @@ int main(int argc, char *argv[]) {
" supplied text file (HTTP Host/TLS SNI).\n"
" This option can be supplied multiple times.\n"
" --set-ttl <value> activate Fake Request Mode and send it with supplied TTL value.\n"
" DANGEROUS! May break websites in unexpected ways. Use with care.\n"
" --auto-ttl [a1-a2] activate Fake Request Mode, automatically detect TTL and decrease\n"
" DANGEROUS! May break websites in unexpected ways. Use with care (or --blacklist).\n"
" --auto-ttl [a1-a2-m] activate Fake Request Mode, automatically detect TTL and decrease\n"
" it based on a distance. If the distance is shorter than a2, TTL is decreased\n"
" by a2. If it's longer, (a1; a2) scale is used with the distance as a weight.\n"
" Default (if set): --auto-ttl 1-4, also sets --min-ttl 3.\n"
" If the resulting TTL is more than m(ax), set it to m.\n"
" Default (if set): --auto-ttl 1-4-10. Also sets --min-ttl 3.\n"
" DANGEROUS! May break websites in unexpected ways. Use with care (or --blacklist).\n"
" --min-ttl <value> minimum TTL distance (128/64 - TTL) for which to send Fake Request\n"
" in --set-ttl and --auto-ttl modes.\n"
" --wrong-chksum activate Fake Request Mode and send it with incorrect TCP checksum.\n"
@ -887,8 +897,12 @@ int main(int argc, char *argv[]) {
auto_ttl_1 = 1;
if (!auto_ttl_2)
auto_ttl_2 = 4;
if (do_auto_ttl && !ttl_min_nhops)
ttl_min_nhops = 3;
if (do_auto_ttl) {
if (!ttl_min_nhops)
ttl_min_nhops = 3;
if (!auto_ttl_max)
auto_ttl_max = 10;
}
printf("Block passive: %d\n" /* 1 */
"Fragment HTTP: %u\n" /* 2 */
@ -904,7 +918,7 @@ int main(int argc, char *argv[]) {
"HTTP Persistent Nowait: %d\n" /* 12 */
"DNS redirect: %d\n" /* 13 */
"DNSv6 redirect: %d\n" /* 14 */
"Fake requests, TTL: %s (fixed: %hu, auto: %hu-%hu, min distance: %hu)\n" /* 15 */
"Fake requests, TTL: %s (fixed: %hu, auto: %hu-%hu-%hu, min distance: %hu)\n" /* 15 */
"Fake requests, wrong checksum: %d\n" /* 16 */
"Fake requests, wrong SEQ/ACK: %d\n", /* 17 */
do_passivedpi, /* 1 */
@ -922,7 +936,8 @@ int main(int argc, char *argv[]) {
do_dnsv4_redirect, /* 13 */
do_dnsv6_redirect, /* 14 */
ttl_of_fake_packet ? "fixed" : (do_auto_ttl ? "auto" : "disabled"), /* 15 */
ttl_of_fake_packet, do_auto_ttl ? auto_ttl_1 : 0, do_auto_ttl ? auto_ttl_2 : 0, ttl_min_nhops,
ttl_of_fake_packet, do_auto_ttl ? auto_ttl_1 : 0, do_auto_ttl ? auto_ttl_2 : 0,
do_auto_ttl ? auto_ttl_max : 0, ttl_min_nhops,
do_wrong_chksum, /* 16 */
do_wrong_seq /* 17 */
);

7
src/ttltrack.c
View File

@ -220,7 +220,8 @@ int tcp_handle_outgoing(uint32_t srcip[4], uint32_t dstip[4],
}
int tcp_get_auto_ttl(const uint8_t ttl, const uint8_t autottl1,
const uint8_t autottl2, const uint8_t minhops) {
const uint8_t autottl2, const uint8_t minhops,
const uint8_t maxttl) {
uint8_t nhops = 0;
uint8_t ttl_of_fake_packet = 0;
@ -243,5 +244,9 @@ int tcp_get_auto_ttl(const uint8_t ttl, const uint8_t autottl1,
ttl_of_fake_packet = nhops - autottl1 - trunc((autottl2 - autottl1) * ((float)nhops/10));
}
if (maxttl && ttl_of_fake_packet > maxttl) {
ttl_of_fake_packet = maxttl;
}
return ttl_of_fake_packet;
}

3
src/ttltrack.h
View File

@ -22,5 +22,6 @@ int tcp_handle_outgoing(uint32_t srcip[4], uint32_t dstip[4],
uint8_t is_ipv6);
int tcp_get_auto_ttl(const uint8_t ttl, const uint8_t autottl1,
const uint8_t autottl2, const uint8_t minhops);
const uint8_t autottl2, const uint8_t minhops,
const uint8_t maxttl);
#endif