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https://github.com/ValdikSS/GoodbyeDPI.git
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Test
This commit is contained in:
ValdikSS
parent
2f0429027d
commit
64c93d29de
126
goodbyedpi.c
126
goodbyedpi.c
@ -296,141 +296,35 @@ int main(int argc, char *argv[]) {
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while (1) {
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while (1) {
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if (WinDivertRecv(w_filter, packet, sizeof(packet), &addr, &packetLen)) {
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if (WinDivertRecv(w_filter, packet, sizeof(packet), &addr, &packetLen)) {
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//printf("Got %s packet, len=%d!\n", addr.Direction ? "inbound" : "outbound",
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printf("Got %s packet, len=%d!\n", addr.Direction ? "inbound" : "outbound",
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// packetLen);
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packetLen);
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should_reinject = 1;
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should_recalc_checksum = 0;
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// do nothing for DATA packet
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if (WinDivertHelperParsePacket(packet, packetLen, &ppIpHdr,
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if (WinDivertHelperParsePacket(packet, packetLen, &ppIpHdr,
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NULL, NULL, NULL, &ppTcpHdr, NULL, &packet_data, &packet_dataLen)) {
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NULL, NULL, NULL, &ppTcpHdr, NULL, &packet_data, &packet_dataLen)) {
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//printf("Got parsed packet, len=%d!\n", packet_dataLen);
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/* Got a packet WITH DATA */
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/* Handle INBOUND packet with data and find HTTP REDIRECT in there */
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if (addr.Direction == WINDIVERT_DIRECTION_INBOUND && packet_dataLen > 16) {
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/* If INBOUND packet with DATA (tcp.Ack) */
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/* Drop packets from filter with HTTP 30x Redirect */
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if (do_passivedpi && is_passivedpi_redirect(packet_data, packet_dataLen)) {
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//printf("Dropping HTTP Redirect packet!\n");
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should_reinject = 0;
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}
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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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find_http_method_end(packet_data,
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(do_fragment_http ? http_fragment_size : 0)) &&
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(do_host || do_host_removespace))
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{
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data_addr = find_host_header(packet_data, packet_dataLen);
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if (data_addr) {
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if (do_host) {
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/* Replace "Host: " with "hoSt: " */
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memcpy(data_addr, http_host_replace, strlen(http_host_replace));
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should_recalc_checksum = 1;
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//printf("Replaced Host header!\n");
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}
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}
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if (do_additional_space && do_host_removespace) {
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// reduce window size on non-data packet
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/* End of "Host:" without trailing space */
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host_addr = data_addr + strlen(http_host_find) - 1;
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method_addr = find_http_method_end(packet_data,
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(do_fragment_http ? http_fragment_size : 0));
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if (method_addr) {
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memmove(method_addr + 1, method_addr, (PVOID)host_addr - (PVOID)method_addr);
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should_recalc_checksum = 1;
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}
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}
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else if (do_host_removespace) {
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host_addr = data_addr + strlen(http_host_find);
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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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"\r\n", 2);
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if (data_addr_rn) {
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/* We move Host header value by one byte to the left and then
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* "insert" stolen space to the end of User-Agent value because
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* some web servers are not tolerant to additional space in the
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* end of Host header.
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*
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* Nothing is done if User-Agent header is missing.
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*/
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host_len = data_addr_rn - host_addr;
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useragent_addr = find_useragent_header(packet_data, packet_dataLen);
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if (host_len <= 253 && useragent_addr) {
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useragent_addr += strlen(http_useragent_find);
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/* useragent_addr is in the beginning of User-Agent value */
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data_len = packet_dataLen - ((PVOID)useragent_addr - packet_data);
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data_addr_rn = dumb_memmem(useragent_addr,
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data_len, "\r\n", 2);
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/* data_addr_rn is in the end of User-Agent value */
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if (data_addr_rn) {
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if (useragent_addr > host_addr) {
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/* User-Agent goes AFTER Host header */
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data_len = (PVOID)data_addr_rn - (PVOID)host_addr;
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/* Move one byte to the LEFT from "Host:"
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* to the end of User-Agent
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*/
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memmove(host_addr - 1, host_addr, data_len);
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/* Put space in the end of User-Agent header */
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*(char*)(data_addr_rn - 1) = ' ';
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should_recalc_checksum = 1;
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//printf("Replaced Host header!\n");
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}
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else {
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/* User-Agent goes BEFORE Host header */
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data_len = (PVOID)host_addr - (PVOID)data_addr_rn - 1;
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/* Move one byte to the RIGHT from the end of User-Agent
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* to the "Host:"
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*/
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memmove(data_addr_rn + 1, data_addr_rn, data_len);
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/* Put space in the end of User-Agent header */
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*(char*)(data_addr_rn) = ' ';
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should_recalc_checksum = 1;
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//printf("Replaced Host header!\n");
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}
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} /* if (dara_addr_rn) */
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} /* if (host_len <= 253 && useragent_addr) */
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} /* if (data_addr_rn) */
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} /* else if (do_host_removespace) */
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} /* if (data_addr) */
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} /* Handle OUTBOUND packet with data */
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} /* Handle packet with data */
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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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else if (WinDivertHelperParsePacket(packet, packetLen, &ppIpHdr,
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NULL, NULL, NULL, &ppTcpHdr, NULL, NULL, NULL)) {
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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 we got SYN+ACK packet */
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if (addr.Direction == WINDIVERT_DIRECTION_INBOUND &&
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if (addr.Direction == WINDIVERT_DIRECTION_INBOUND &&
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ppTcpHdr->Syn == 1) {
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ppTcpHdr->Syn == 1) {
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//printf("Changing Window Size!\n");
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printf("Changing Window Size!\n");
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if (do_fragment_http && ppTcpHdr->SrcPort == htons(80)) {
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if (do_fragment_http && ppTcpHdr->SrcPort == htons(80)) {
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change_window_size(packet, http_fragment_size);
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change_window_size(packet, http_fragment_size);
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should_recalc_checksum = 1;
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WinDivertHelperCalcChecksums(packet, packetLen, 0);
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}
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}
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else if (do_fragment_https && ppTcpHdr->SrcPort != htons(80)) {
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else if (do_fragment_https && ppTcpHdr->SrcPort != htons(80)) {
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change_window_size(packet, https_fragment_size);
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change_window_size(packet, https_fragment_size);
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should_recalc_checksum = 1;
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}
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}
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}
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if (should_reinject) {
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//printf("Re-injecting!\n");
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if (should_recalc_checksum) {
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WinDivertHelperCalcChecksums(packet, packetLen, 0);
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WinDivertHelperCalcChecksums(packet, packetLen, 0);
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}
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}
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WinDivertSend(w_filter, packet, packetLen, &addr, NULL);
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}
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}
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}
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}
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// uncomment this to make it work
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//WinDivertHelperCalcChecksums(packet, packetLen, 0);
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WinDivertSend(w_filter, packet, packetLen, &addr, NULL);
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}
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else {
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else {
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// error, ignore
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// error, ignore
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printf("Error receiving packet!\n");
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printf("Error receiving packet!\n");
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