mirror of
https://github.com/ValdikSS/GoodbyeDPI.git
synced 2024-12-22 06:15:27 +00:00
Switch to getopt() and slightly update fragmentation code
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ValdikSS
parent
6b40623dce
commit
46af3c2edb
114
goodbyedpi.c
114
goodbyedpi.c
@ -80,13 +80,15 @@ static PVOID find_host_header(char *pktdata, int pktlen) {
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(char*)http_host_find, strlen(http_host_find));
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}
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static void change_window_size(char *pkt) {
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*(pkt + IPV4_HDR_LEN + TCP_WINDOWSIZE_OFFSET) = 0x00;
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*(pkt + IPV4_HDR_LEN + TCP_WINDOWSIZE_OFFSET + 1) = 0x02;
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static void change_window_size(char *pkt, int size) {
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*(uint16_t*)(pkt + IPV4_HDR_LEN + TCP_WINDOWSIZE_OFFSET) = htons(size);
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}
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int main(int argc, char *argv[]) {
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static const char fragment_size_message[] =
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"Fragment size should be in range [0 - 65535]\n";
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int i, should_reinject = 0;
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int opt;
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HANDLE w_filter = NULL;
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WINDIVERT_ADDRESS addr;
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char packet[MAX_PACKET_SIZE];
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@ -96,35 +98,83 @@ int main(int argc, char *argv[]) {
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PWINDIVERT_IPHDR ppIpHdr;
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PWINDIVERT_TCPHDR ppTcpHdr;
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int do_passivedpi, do_fragment, do_host, do_host_removespace;
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int temp;
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char *data_addr, *data_addr_rn, *host_addr = NULL;
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int do_passivedpi = 0, do_fragment_http = 0,
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do_fragment_https = 0, do_host = 0,
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do_host_removespace = 0;
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int http_fragment_size = 2;
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int https_fragment_size = 2;
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char *data_addr, *data_addr_rn, *host_addr;
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int host_len, fromhost_uptoend_len;
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printf("GoodbyeDPI: Passive DPI blocker and Active DPI circumvention utility\n\n");
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printf("GoodbyeDPI: Passive DPI blocker and Active DPI circumvention utility\n");
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if (argc == 2) {
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temp = atoi(argv[1]);
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do_passivedpi = !!(temp & 1);
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do_fragment = !!(temp & 2);
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do_host = !!(temp & 4);
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do_host_removespace = !!(temp & 8);
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printf("Block passive: %d, Fragment: %d, hoSt: %d, Host no space: %d\n",
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do_passivedpi, do_fragment, do_host, do_host_removespace);
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if (argc == 1) {
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/* enable mode -1 by default */
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do_passivedpi = do_host = do_host_removespace \
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= do_fragment_http = do_fragment_https = 1;
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}
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else {
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printf("goodbyedpi.exe [1: block passive DPI, 2: fragment outbound, "
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"4: replace Host with hoSt, 8: remove space between host header and value]\n");
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printf("Default: 15 (all enabled)\n");
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while ((opt = getopt(argc, argv, "123prsf:e:")) != -1) {
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switch (opt) {
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case '1':
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do_passivedpi = do_host = do_host_removespace \
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= do_fragment_http = do_fragment_https = 1;
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break;
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case '2':
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do_passivedpi = do_host = do_host_removespace \
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= do_fragment_http = do_fragment_https = 1;
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https_fragment_size = 40;
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break;
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case '3':
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do_passivedpi = do_host = do_host_removespace = 1;
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break;
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case 'p':
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do_passivedpi = 1;
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do_fragment = 1;
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break;
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case 'r':
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do_host = 1;
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break;
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case 's':
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do_host_removespace = 1;
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break;
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case 'f':
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do_fragment_http = 1;
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http_fragment_size = atoi(optarg);
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if (http_fragment_size <= 0 || http_fragment_size > 65535) {
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printf(fragment_size_message);
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exit(EXIT_FAILURE);
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}
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break;
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case 'e':
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do_fragment_https = 1;
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https_fragment_size = atoi(optarg);
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if (https_fragment_size <= 0 || https_fragment_size > 65535) {
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printf(fragment_size_message);
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exit(EXIT_FAILURE);
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}
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break;
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default:
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printf("Usage: goodbyedpi.exe [OPTION...]\n"
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" -p block passive DPI\n"
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" -r replace Host with hoSt\n"
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" -s remove space between host header and its value\n"
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" -f [value] set HTTP fragmentation to value\n"
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" -e [value] set HTTPS fragmentation to value\n"
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"\n"
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" -1 enables all options, -f 2 -e 2 (most compatible mode, default)\n"
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" -2 enables all options, -f 2 -e 40 (better speed yet still compatible)\n"
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" -3 all options except fragmentation (best speed)\n");
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exit(EXIT_FAILURE);
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}
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}
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printf("Opening filter\n");
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printf("Block passive: %d, Fragment HTTP: %d, Fragment HTTPS: %d, "
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"hoSt: %d, Host no space: %d\n",
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do_passivedpi, (do_fragment_http ? http_fragment_size : 0),
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(do_fragment_https ? https_fragment_size : 0),
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do_host, do_host_removespace);
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printf("\nOpening filter\n");
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filter_num = 0;
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if (do_passivedpi) {
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@ -178,10 +228,10 @@ int main(int argc, char *argv[]) {
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}
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/* Handle OUTBOUND packet, search for Host header */
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else if (addr.Direction == WINDIVERT_DIRECTION_OUTBOUND &&
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packet_dataLen > 16 && ppTcpHdr->DstPort == htons(80)) {
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if (do_host || do_host_removespace) {
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packet_dataLen > 16 && ppTcpHdr->DstPort == htons(80) &&
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(do_host || do_host_removespace)) {
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data_addr = find_host_header(packet_data, packet_dataLen);
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}
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if (do_host && data_addr) {
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/* Replace "Host: " with "hoSt: " */
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@ -192,12 +242,12 @@ int main(int argc, char *argv[]) {
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if (do_host_removespace && data_addr) {
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host_addr = data_addr + strlen(http_host_find);
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fromhost_uptoend_len = packet_dataLen - ((PVOID)host_addr - packet_data);
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data_addr_rn = dumb_memmem(host_addr,
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packet_dataLen - ((PVOID)host_addr - packet_data),
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fromhost_uptoend_len,
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"\r\n", 2);
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if (data_addr_rn) {
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host_len = data_addr_rn - host_addr;
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fromhost_uptoend_len = packet_dataLen - ((PVOID)host_addr - packet_data);
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if (host_len <= 64) {
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/* Move memory left by 1 byte and reduce packet size for 1 byte */
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memmove(host_addr - 1, host_addr, fromhost_uptoend_len);
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@ -210,20 +260,22 @@ int main(int argc, char *argv[]) {
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}
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}
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}
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if (do_host || do_host_removespace) {
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WinDivertHelperCalcChecksums(packet, packetLen, 0);
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}
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}
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}
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/* Else if we got TCP packet without data */
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else if (WinDivertHelperParsePacket(packet, packetLen, &ppIpHdr,
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NULL, NULL, NULL, &ppTcpHdr, NULL, NULL, NULL)) {
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/* If we got SYN+ACK packet */
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if (addr.Direction == WINDIVERT_DIRECTION_INBOUND &&
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ppTcpHdr->Syn == 1) {
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if (do_fragment) {
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//printf("Changing Window Size!\n");
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change_window_size(packet);
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if (do_fragment_http && ppTcpHdr->DstPort == htons(80)) {
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change_window_size(packet, http_fragment_size);
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WinDivertHelperCalcChecksums(packet, packetLen, 0);
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}
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else if (do_fragment_https && ppTcpHdr->DstPort != htons(80)) {
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change_window_size(packet, https_fragment_size);
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WinDivertHelperCalcChecksums(packet, packetLen, 0);
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}
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}
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