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GoodbyeDPI
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New feature: additional processed TCP ports

This commit is contained in:
ValdikSS 2017-12-06 03:05:09 +03:00
parent 9b9be302cb
commit 61e39bc095
1 changed files with 47 additions and 11 deletions
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58
goodbyedpi.c
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@ -8,7 +8,7 @@
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <winsock2.h>
#include <getopt.h>
#include "windivert.h"
#define die() do { printf("Something went wrong!\n" \
@ -56,6 +56,40 @@ static const char *http_methods[] = {
"OPTIONS ",
};
static struct option long_options[] = {
{"port", required_argument, 0, 'z' },
{0, 0, 0, 0 }
};
static char *filter_string = "(ip and tcp and "
"(inbound and (("
"((ip.Id == 0x0001 or ip.Id == 0x0000) and tcp.SrcPort == 80 and tcp.Ack) or "
"((tcp.SrcPort == 80 or tcp.SrcPort == 443) and tcp.Ack and tcp.Syn)"
") and " DIVERT_NO_LOCALNETS_SRC ") or "
"(outbound and "
"(tcp.DstPort == 80 or tcp.DstPort == 443) and tcp.Ack and "
DIVERT_NO_LOCALNETS_DST ")"
"))";
static void add_filter_str(int proto, int port) {
const char *udp = " or (ip and udp and (udp.SrcPort == %d or udp.DstPort == %d))";
const char *tcp = " or (ip and tcp and (tcp.SrcPort == %d or tcp.DstPort == %d))";
char *current_filter = filter_string;
int new_filter_size = strlen(current_filter) +
(proto == IPPROTO_UDP ? strlen(udp) : strlen(tcp)) + 16;
char *new_filter = malloc(new_filter_size);
strcpy(new_filter, current_filter);
if (proto == IPPROTO_UDP)
sprintf(&(new_filter[strlen(new_filter)]), udp, port, port);
else
sprintf(&(new_filter[strlen(new_filter)]), tcp, port, port);
filter_string = new_filter;
free(current_filter);
}
static char* dumb_memmem(const char* haystack, int hlen, const char* needle, int nlen) {
// naive implementation
if (nlen > hlen) return NULL;
@ -271,6 +305,16 @@ int main(int argc, char *argv[]) {
case 'w':
do_http_allports = 1;
break;
case 'z':
/* i is used as a temporary variable here */
i = atoi(optarg);
if (i <= 0 || i > 65535) {
printf("Port parameter error!\n");
exit(EXIT_FAILURE);
}
add_filter_str(IPPROTO_TCP, i);
i = 0;
break;
default:
printf("Usage: goodbyedpi.exe [OPTION...]\n"
" -p block passive DPI\n"
@ -281,6 +325,7 @@ int main(int argc, char *argv[]) {
" -f [value] set HTTP fragmentation to value\n"
" -e [value] set HTTPS fragmentation to value\n"
" -w try to find and parse HTTP traffic on all processed ports (not only on port 80)\n"
" --port additional TCP port to perform fragmentation on (and HTTP tricks with -w)\n"
"\n"
" -1 -p -r -s -f 2 -e 2 (most compatible mode, default)\n"
" -2 -p -r -s -f 2 -e 40 (better speed yet still compatible)\n"
@ -323,16 +368,7 @@ int main(int argc, char *argv[]) {
* IPv4 filter for inbound HTTP redirection packets and
* active DPI circumvention
*/
filters[filter_num] = init("ip and tcp and "
"(inbound and (("
"((ip.Id == 0x0001 or ip.Id == 0x0000) and tcp.SrcPort == 80 and tcp.Ack) or "
"((tcp.SrcPort == 80 or tcp.SrcPort == 443) and tcp.Ack and tcp.Syn)"
") and " DIVERT_NO_LOCALNETS_SRC ") or "
"(outbound and "
"(tcp.DstPort == 80 or tcp.DstPort == 443) and tcp.Ack and "
DIVERT_NO_LOCALNETS_DST ")"
")",
0);
filters[filter_num] = init(filter_string, 0);
w_filter = filters[filter_num];
filter_num++;