GoodbyeDPI/goodbyedpi.c
2017-09-07 16:01:19 +03:00

335 lines
12 KiB
C

/*
* GoodbyeDPI — Passive DPI blocker and Active DPI circumvention utility.
*/
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <winsock2.h>
#include "windivert.h"
#define die() do { printf("Something went wrong!\n" \
"Make sure you're running this program with administrator privileges\n"); \
sleep(10); exit(EXIT_FAILURE); } while (0)
#define MAX_FILTERS 4
#define MAX_PACKET_SIZE 1516
#define IPV4_HDR_LEN 20
#define TCP_HDR_LEN 20
#define IPV4_TOTALLEN_OFFSET 2
#define TCP_WINDOWSIZE_OFFSET 14
#define DIVERT_NO_LOCALNETS_DST "(" \
"(ip.DstAddr < 127.0.0.1 or ip.DstAddr > 127.255.255.255) and " \
"(ip.DstAddr < 10.0.0.0 or ip.DstAddr > 10.255.255.255) and " \
"(ip.DstAddr < 192.168.0.0 or ip.DstAddr > 192.168.255.255) and " \
"(ip.DstAddr < 172.16.0.0 or ip.DstAddr > 172.31.255.255) and " \
"(ip.DstAddr < 169.254.0.0 or ip.DstAddr > 169.254.255.255)" \
")"
#define DIVERT_NO_LOCALNETS_SRC "(" \
"(ip.SrcAddr < 127.0.0.1 or ip.SrcAddr > 127.255.255.255) and " \
"(ip.SrcAddr < 10.0.0.0 or ip.SrcAddr > 10.255.255.255) and " \
"(ip.SrcAddr < 192.168.0.0 or ip.SrcAddr > 192.168.255.255) and " \
"(ip.SrcAddr < 172.16.0.0 or ip.SrcAddr > 172.31.255.255) and " \
"(ip.SrcAddr < 169.254.0.0 or ip.SrcAddr > 169.254.255.255)" \
")"
static HANDLE filters[MAX_FILTERS];
static int filter_num = 0;
static const char *http10_redirect_302 = "HTTP/1.0 302 ";
static const char *http11_redirect_302 = "HTTP/1.1 302 ";
static const char *http_host_find = "\r\nHost: ";
static const char *http_host_replace = "\r\nhoSt: ";
static const char *http_useragent_find = "\r\nUser-Agent: ";
static const char *location_http = "\r\nLocation: http://";
static const char *connection_close = "\r\nConnection: close";
static const char *http_methods[] = {
"GET ",
"HEAD ",
"POST ",
"PUT ",
"DELETE ",
"CONNECT ",
"OPTIONS ",
};
static char* dumb_memmem(const char* haystack, int hlen, const char* needle, int nlen) {
// naive implementation
if (nlen > hlen) return 0;
int i;
for (i=0; i<hlen-nlen+1; i++) {
if (memcmp(haystack+i,needle,nlen)==0) {
return (char*)(haystack+i);
}
}
return NULL;
}
static HANDLE init(char *filter, UINT64 flags) {
LPTSTR errormessage = NULL;
filter = WinDivertOpen(filter, WINDIVERT_LAYER_NETWORK, 0, flags);
if (filter != INVALID_HANDLE_VALUE)
return filter;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, GetLastError(), MAKELANGID(LANG_ENGLISH, SUBLANG_DEFAULT),
(LPTSTR)&errormessage, 0, NULL);
printf("%s", errormessage);
return NULL;
}
static int deinit(HANDLE handle) {
if (handle) {
WinDivertClose(handle);
return 1;
}
return 0;
}
static void deinit_all() {
for (int i = 0; i < filter_num; i++) {
deinit(filters[i]);
}
}
static void sigint_handler(int sig) {
deinit_all();
exit(EXIT_SUCCESS);
}
static int is_passivedpi_redirect(const char *pktdata, int pktlen) {
/* First check if this is HTTP 302 redirect */
if (memcmp(pktdata, http11_redirect_302, strlen(http11_redirect_302)) == 0 ||
memcmp(pktdata, http10_redirect_302, strlen(http10_redirect_302)) == 0)
{
/* Then check if this is a redirect to new http site with Connection: close */
if (dumb_memmem(pktdata, pktlen, location_http, strlen(location_http)) &&
dumb_memmem(pktdata, pktlen, connection_close, strlen(connection_close))) {
return 1;
}
}
return 0;
}
/* Finds Host header with \r\n before it */
static PVOID find_host_header(const char *pktdata, int pktlen) {
return dumb_memmem(pktdata, pktlen,
http_host_find, strlen(http_host_find));
}
/* Finds User-Agent header with \r\n before it */
static PVOID find_useragent_header(const char *pktdata, int pktlen) {
return dumb_memmem(pktdata, pktlen,
http_useragent_find, strlen(http_useragent_find));
}
static void change_window_size(const char *pkt, int size) {
*(uint16_t*)(pkt + IPV4_HDR_LEN + TCP_WINDOWSIZE_OFFSET) = htons(size);
}
/* HTTP method end without trailing space */
static PVOID find_http_method_end(const char *pkt, int offset) {
int i;
for (i = 0; i<(sizeof(http_methods) / sizeof(*http_methods)); i++) {
if (memcmp(pkt, http_methods[i], strlen(http_methods[i])) == 0) {
return (char*)pkt + strlen(http_methods[i]) - 1;
}
/* Try to find HTTP method in a second part of fragmented packet */
if ((offset == 1 || offset == 2) &&
memcmp(pkt, http_methods[i] + offset,
strlen(http_methods[i]) - offset) == 0
)
{
return (char*)pkt + strlen(http_methods[i]) - offset - 1;
}
}
return NULL;
}
int main(int argc, char *argv[]) {
static const char fragment_size_message[] =
"Fragment size should be in range [0 - 65535]\n";
int i, should_reinject, should_recalc_checksum = 0;
int opt;
HANDLE w_filter = NULL;
WINDIVERT_ADDRESS addr;
char packet[MAX_PACKET_SIZE];
PVOID packet_data;
UINT packetLen;
UINT packet_dataLen;
PWINDIVERT_IPHDR ppIpHdr;
PWINDIVERT_TCPHDR ppTcpHdr;
int do_passivedpi = 0, do_fragment_http = 0,
do_fragment_https = 0, do_host = 0,
do_host_removespace = 0, do_additional_space = 0;
int http_fragment_size = 2;
int https_fragment_size = 2;
char *data_addr, *data_addr_rn, *host_addr, *useragent_addr, *method_addr;
int data_len, host_len;
printf("GoodbyeDPI: Passive DPI blocker and Active DPI circumvention utility\n");
if (argc == 1) {
/* enable mode -1 by default */
do_passivedpi = do_host = do_host_removespace \
= do_fragment_http = do_fragment_https = 1;
}
while ((opt = getopt(argc, argv, "1234prsaf:e:")) != -1) {
switch (opt) {
case '1':
do_passivedpi = do_host = do_host_removespace \
= do_fragment_http = do_fragment_https = 1;
break;
case '2':
do_passivedpi = do_host = do_host_removespace \
= do_fragment_http = do_fragment_https = 1;
https_fragment_size = 40;
break;
case '3':
do_passivedpi = do_host = do_host_removespace \
= do_fragment_https = 1;
https_fragment_size = 40;
case '4':
do_passivedpi = do_host = do_host_removespace = 1;
break;
case 'p':
do_passivedpi = 1;
break;
case 'r':
do_host = 1;
break;
case 's':
do_host_removespace = 1;
break;
case 'a':
do_additional_space = 1;
do_host_removespace = 1;
break;
case 'f':
do_fragment_http = 1;
http_fragment_size = atoi(optarg);
if (http_fragment_size <= 0 || http_fragment_size > 65535) {
printf(fragment_size_message);
exit(EXIT_FAILURE);
}
break;
case 'e':
do_fragment_https = 1;
https_fragment_size = atoi(optarg);
if (https_fragment_size <= 0 || https_fragment_size > 65535) {
printf(fragment_size_message);
exit(EXIT_FAILURE);
}
break;
default:
printf("Usage: goodbyedpi.exe [OPTION...]\n"
" -p block passive DPI\n"
" -r replace Host with hoSt\n"
" -s remove space between host header and its value\n"
" -a additional space between Method and Request-URI (enables -s, may break sites)\n"
" -f [value] set HTTP fragmentation to value\n"
" -e [value] set HTTPS fragmentation to value\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"
" -3 -p -r -s -e 40 (even better speed)\n"
" -4 -p -r -s (best speed)\n");
exit(EXIT_FAILURE);
}
}
printf("Block passive: %d, Fragment HTTP: %d, Fragment HTTPS: %d, "
"hoSt: %d, Host no space: %d, Additional space: %d\n",
do_passivedpi, (do_fragment_http ? http_fragment_size : 0),
(do_fragment_https ? https_fragment_size : 0),
do_host, do_host_removespace, do_additional_space);
if (do_fragment_http && http_fragment_size > 2) {
printf("WARNING: HTTP fragmentation values > 2 are not fully compatible "
"with other options. Please use values <= 2 or disable HTTP fragmentation "
"completely.\n");
}
printf("\nOpening filter\n");
filter_num = 0;
if (do_passivedpi) {
/* IPv4 filter for inbound RST packets with ID = 0 or 1 */
filters[filter_num] = init(
"inbound and ip and tcp and "
"(ip.Id == 0x0001 or ip.Id == 0x0000) and "
"(tcp.SrcPort == 443 or tcp.SrcPort == 80) and tcp.Rst and "
DIVERT_NO_LOCALNETS_SRC,
WINDIVERT_FLAG_DROP);
filter_num++;
}
/*
* 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);
w_filter = filters[filter_num];
filter_num++;
for (i = 0; i < filter_num; i++) {
if (filters[i] == NULL)
die();
}
printf("Filter activated!\n");
signal(SIGINT, sigint_handler);
while (1) {
if (WinDivertRecv(w_filter, packet, sizeof(packet), &addr, &packetLen)) {
printf("Got %s packet, len=%d!\n", addr.Direction ? "inbound" : "outbound",
packetLen);
// do nothing for DATA packet
if (WinDivertHelperParsePacket(packet, packetLen, &ppIpHdr,
NULL, NULL, NULL, &ppTcpHdr, NULL, &packet_data, &packet_dataLen)) {
}
// reduce window size on non-data packet
else if (WinDivertHelperParsePacket(packet, packetLen, &ppIpHdr,
NULL, NULL, NULL, &ppTcpHdr, NULL, NULL, NULL)) {
/* If we got SYN+ACK packet */
if (addr.Direction == WINDIVERT_DIRECTION_INBOUND &&
ppTcpHdr->Syn == 1) {
printf("Changing Window Size!\n");
if (do_fragment_http && ppTcpHdr->SrcPort == htons(80)) {
change_window_size(packet, http_fragment_size);
WinDivertHelperCalcChecksums(packet, packetLen, 0);
}
else if (do_fragment_https && ppTcpHdr->SrcPort != htons(80)) {
change_window_size(packet, https_fragment_size);
WinDivertHelperCalcChecksums(packet, packetLen, 0);
}
}
}
// uncomment this to make it work
//WinDivertHelperCalcChecksums(packet, packetLen, 0);
WinDivertSend(w_filter, packet, packetLen, &addr, NULL);
}
else {
// error, ignore
printf("Error receiving packet!\n");
break;
}
}
}