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https://github.com/ValdikSS/GoodbyeDPI.git
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Preliminary IPv6 support.
No IPv6 support in DNS redirection code. IPv6 DNS request packets would be dropped.
This commit is contained in:
ValdikSS
parent
3ffce30871
commit
5e9e1f0eb6
168
goodbyedpi.c
168
goodbyedpi.c
@ -22,14 +22,14 @@
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#define MAX_FILTERS 4
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#define MAX_PACKET_SIZE 9016
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#define DIVERT_NO_LOCALNETS_DST "(" \
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#define DIVERT_NO_LOCALNETSv4_DST "(" \
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"(ip.DstAddr < 127.0.0.1 or ip.DstAddr > 127.255.255.255) and " \
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"(ip.DstAddr < 10.0.0.0 or ip.DstAddr > 10.255.255.255) and " \
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"(ip.DstAddr < 192.168.0.0 or ip.DstAddr > 192.168.255.255) and " \
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"(ip.DstAddr < 172.16.0.0 or ip.DstAddr > 172.31.255.255) and " \
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"(ip.DstAddr < 169.254.0.0 or ip.DstAddr > 169.254.255.255)" \
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")"
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#define DIVERT_NO_LOCALNETS_SRC "(" \
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#define DIVERT_NO_LOCALNETSv4_SRC "(" \
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"(ip.SrcAddr < 127.0.0.1 or ip.SrcAddr > 127.255.255.255) and " \
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"(ip.SrcAddr < 10.0.0.0 or ip.SrcAddr > 10.255.255.255) and " \
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"(ip.SrcAddr < 192.168.0.0 or ip.SrcAddr > 192.168.255.255) and " \
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@ -37,6 +37,21 @@
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"(ip.SrcAddr < 169.254.0.0 or ip.SrcAddr > 169.254.255.255)" \
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")"
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#define DIVERT_NO_LOCALNETSv6_DST "(" \
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"(ipv6.DstAddr > ::1) and " \
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"(ipv6.DstAddr < 2001::0 or ipv6.DstAddr > 2002::0) and " \
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"(ipv6.DstAddr < fc00::0 or ipv6.DstAddr > fe00::0) and " \
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"(ipv6.DstAddr < fe80::0 or ipv6.DstAddr > fec0::0) and " \
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"(ipv6.DstAddr < ff00::0 or ipv6.DstAddr > ffff::0)" \
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")"
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#define DIVERT_NO_LOCALNETSv6_SRC "(" \
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"(ipv6.SrcAddr > ::1) and " \
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"(ipv6.SrcAddr < 2001::0 or ipv6.SrcAddr > 2002::0) and " \
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"(ipv6.SrcAddr < fc00::0 or ipv6.SrcAddr > fe00::0) and " \
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"(ipv6.SrcAddr < fe80::0 or ipv6.SrcAddr > fec0::0) and " \
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"(ipv6.SrcAddr < ff00::0 or ipv6.SrcAddr > ffff::0)" \
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")"
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#define SET_HTTP_FRAGMENT_SIZE_OPTION(fragment_size) do { \
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if (!http_fragment_size) { \
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if (fragment_size <= 0 || fragment_size > 65535) { \
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@ -83,19 +98,24 @@ static struct option long_options[] = {
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};
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static char *filter_string = NULL;
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static char *filter_string_template = "(ip and tcp and "
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"(inbound and (("
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"((ip.Id == 0x0001 or ip.Id == 0x0000) and tcp.SrcPort == 80 and tcp.Ack) or "
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"((tcp.SrcPort == 80 or tcp.SrcPort == 443) and tcp.Ack and tcp.Syn)"
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") and " DIVERT_NO_LOCALNETS_SRC ") or "
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static char *filter_string_template = "(tcp and "
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"(inbound and ("
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"("
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"("
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"(ip.Id >= 0x0 and ip.Id <= 0xF) and "
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"tcp.SrcPort == 80 and tcp.Ack"
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") or "
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"((tcp.SrcPort == 80 or tcp.SrcPort == 443) and tcp.Ack and tcp.Syn)"
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")"
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" and (" DIVERT_NO_LOCALNETSv4_SRC " or " DIVERT_NO_LOCALNETSv6_SRC ")) or "
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"(outbound and "
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"(tcp.DstPort == 80 or tcp.DstPort == 443) and tcp.Ack and "
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DIVERT_NO_LOCALNETS_DST ")"
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"(" DIVERT_NO_LOCALNETSv4_DST " or " DIVERT_NO_LOCALNETSv6_DST "))"
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"))";
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static void add_filter_str(int proto, int port) {
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const char *udp = " or (ip and udp and (udp.SrcPort == %d or udp.DstPort == %d))";
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const char *tcp = " or (ip and tcp and (tcp.SrcPort == %d or tcp.DstPort == %d))";
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const char *udp = " or (udp and (udp.SrcPort == %d or udp.DstPort == %d))";
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const char *tcp = " or (tcp and (tcp.SrcPort == %d or tcp.DstPort == %d))";
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char *current_filter = filter_string;
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int new_filter_size = strlen(current_filter) +
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@ -245,10 +265,14 @@ static PVOID find_http_method_end(const char *pkt, int http_frag, int *is_fragme
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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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static enum packet_type_e {
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unknown,
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ipv4_tcp, ipv4_tcp_data, ipv4_udp_data,
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ipv6_tcp, ipv6_tcp_data, ipv6_udp_data
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} packet_type;
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int i, should_reinject, should_recalc_checksum = 0;
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int opt;
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int packet_v4, packet_v6;
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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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@ -256,6 +280,7 @@ int main(int argc, char *argv[]) {
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UINT packetLen;
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UINT packet_dataLen;
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PWINDIVERT_IPHDR ppIpHdr;
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PWINDIVERT_IPV6HDR ppIpV6Hdr;
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PWINDIVERT_TCPHDR ppTcpHdr;
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PWINDIVERT_UDPHDR ppUdpHdr;
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conntrack_info_t dns_conn_info;
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@ -469,18 +494,18 @@ int main(int argc, char *argv[]) {
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filter_num = 0;
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if (do_passivedpi) {
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/* IPv4 filter for inbound RST packets with ID = 0 or 1 */
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/* IPv4 only filter for inbound RST packets with ID = 0 or 1 */
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filters[filter_num] = init(
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"inbound and ip and tcp and "
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"(ip.Id == 0x0001 or ip.Id == 0x0000) and "
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"(ip.Id >= 0x0000 and ip.Id <= 0x000F) and "
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"(tcp.SrcPort == 443 or tcp.SrcPort == 80) and tcp.Rst and "
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DIVERT_NO_LOCALNETS_SRC,
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DIVERT_NO_LOCALNETSv4_SRC,
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WINDIVERT_FLAG_DROP);
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filter_num++;
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}
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/*
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* IPv4 filter for inbound HTTP redirection packets and
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* IPv4 & IPv6 filter for inbound HTTP redirection packets and
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* active DPI circumvention
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*/
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filters[filter_num] = init(filter_string, 0);
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@ -498,13 +523,53 @@ int main(int argc, char *argv[]) {
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while (1) {
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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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// packetLen);
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debug("Got %s packet, len=%d!\n", addr.Direction ? "inbound" : "outbound",
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packetLen);
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should_reinject = 1;
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should_recalc_checksum = 0;
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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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ppIpHdr = (PWINDIVERT_IPHDR)NULL;
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ppIpV6Hdr = (PWINDIVERT_IPV6HDR)NULL;
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ppTcpHdr = (PWINDIVERT_TCPHDR)NULL;
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ppUdpHdr = (PWINDIVERT_UDPHDR)NULL;
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packet_v4 = packet_v6 = 0;
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packet_type = unknown;
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// Parse network packet and set it's type
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if ((packet_v4 = WinDivertHelperParsePacket(packet, packetLen, &ppIpHdr,
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NULL, NULL, NULL, &ppTcpHdr, NULL, &packet_data, &packet_dataLen)))
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{
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packet_type = ipv4_tcp_data;
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}
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else if ((packet_v6 = WinDivertHelperParsePacket(packet, packetLen, NULL,
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&ppIpV6Hdr, NULL, NULL, &ppTcpHdr, NULL, &packet_data, &packet_dataLen)))
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{
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packet_type = ipv6_tcp_data;
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}
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else if ((packet_v4 = WinDivertHelperParsePacket(packet, packetLen, &ppIpHdr,
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NULL, NULL, NULL, &ppTcpHdr, NULL, NULL, NULL)))
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{
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packet_type = ipv4_tcp;
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}
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else if ((packet_v6 = WinDivertHelperParsePacket(packet, packetLen, NULL,
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&ppIpV6Hdr, NULL, NULL, &ppTcpHdr, NULL, NULL, NULL)))
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{
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packet_type = ipv6_tcp;
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}
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else if ((packet_v4 = WinDivertHelperParsePacket(packet, packetLen, &ppIpHdr,
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NULL, NULL, NULL, NULL, &ppUdpHdr, &packet_data, &packet_dataLen)))
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{
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packet_type = ipv4_udp_data;
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}
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else if ((packet_v6 = WinDivertHelperParsePacket(packet, packetLen, NULL,
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&ppIpV6Hdr, NULL, NULL, NULL, &ppUdpHdr, &packet_data, &packet_dataLen)))
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{
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packet_type = ipv6_udp_data;
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}
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debug("packet_type: %d, packet_v4: %d, packet_v6: %d\n", packet_type, packet_v4, packet_v6);
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if (packet_type == ipv4_tcp_data || packet_type == ipv6_tcp_data) {
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//printf("Got parsed packet, len=%d!\n", packet_dataLen);
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/* Got a TCP packet WITH DATA */
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@ -551,12 +616,19 @@ int main(int argc, char *argv[]) {
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* but it's better to send it anyway since it eliminates one RTT.
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*/
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if (do_fragment_http_persistent && !http_req_fragmented &&
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(packet_dataLen > http_fragment_size)
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) {
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ppIpHdr->Length = htons(
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ntohs(ppIpHdr->Length) -
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packet_dataLen + http_fragment_size
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);
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(packet_dataLen > http_fragment_size))
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{
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if (packet_v4)
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ppIpHdr->Length = htons(
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ntohs(ppIpHdr->Length) -
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packet_dataLen + http_fragment_size
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);
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else if (packet_v6)
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ppIpV6Hdr->Length = htons(
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ntohs(ppIpV6Hdr->Length) -
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packet_dataLen + http_fragment_size
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);
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WinDivertHelperCalcChecksums(
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packet, packetLen - packet_dataLen + http_fragment_size, 0
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);
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@ -565,11 +637,18 @@ int main(int argc, char *argv[]) {
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packetLen - packet_dataLen + http_fragment_size,
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&addr, NULL
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);
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if (do_fragment_http_persistent_nowait) {
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ppIpHdr->Length = htons(
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ntohs(ppIpHdr->Length) -
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http_fragment_size + packet_dataLen - http_fragment_size
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);
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if (packet_v4)
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ppIpHdr->Length = htons(
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ntohs(ppIpHdr->Length) -
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http_fragment_size + packet_dataLen - http_fragment_size
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);
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else if (packet_v6)
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ppIpV6Hdr->Length = htons(
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ntohs(ppIpV6Hdr->Length) -
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http_fragment_size + packet_dataLen - http_fragment_size
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);
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memmove(packet_data,
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packet_data + http_fragment_size,
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packet_dataLen);
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@ -666,8 +745,7 @@ int main(int argc, char *argv[]) {
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} /* Handle TCP 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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NULL, NULL, NULL, &ppTcpHdr, NULL, NULL, NULL)) {
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else if (packet_type == ipv4_tcp || packet_type == ipv6_tcp) {
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/* If we got INBOUND SYN+ACK packet */
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if (addr.Direction == WINDIVERT_DIRECTION_INBOUND &&
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ppTcpHdr->Syn == 1 && ppTcpHdr->Ack == 1) {
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@ -688,17 +766,24 @@ int main(int argc, char *argv[]) {
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}
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/* Else if we got UDP packet with data */
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else if (do_dns_redirect && WinDivertHelperParsePacket(packet, packetLen, &ppIpHdr,
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NULL, NULL, NULL, NULL, &ppUdpHdr, &packet_data, &packet_dataLen)) {
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else if (do_dns_redirect &&
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(packet_type == ipv4_udp_data || packet_type == ipv6_udp_data)) {
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if (addr.Direction == WINDIVERT_DIRECTION_INBOUND) {
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if (dns_handle_incoming(ppIpHdr->DstAddr, ppUdpHdr->DstPort,
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if ((packet_v4 && dns_handle_incoming(ppIpHdr->DstAddr, ppUdpHdr->DstPort,
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packet_data, packet_dataLen,
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&dns_conn_info))
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/*||
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(packet_v6 && dns_handle_incoming(ppIpV6Hdr->DstAddr, ppUdpHdr->DstPort,
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packet_data, packet_dataLen,
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&dns_conn_info))*/)
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{
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/* Changing source IP and port to the values
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* from DNS conntrack */
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ppIpHdr->SrcAddr = dns_conn_info.dstip;
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if (packet_v4)
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ppIpHdr->SrcAddr = dns_conn_info.dstip;
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/*else if (packet_v6)
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ppIpV6Hdr->SrcAddr = dns_conn_info.dstip;*/
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ppUdpHdr->DstPort = dns_conn_info.srcport;
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ppUdpHdr->SrcPort = dns_conn_info.dstport;
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should_recalc_checksum = 1;
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@ -715,13 +800,20 @@ int main(int argc, char *argv[]) {
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}
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else if (addr.Direction == WINDIVERT_DIRECTION_OUTBOUND) {
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if (dns_handle_outgoing(ppIpHdr->SrcAddr, ppUdpHdr->SrcPort,
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if ((packet_v4 && dns_handle_outgoing(ppIpHdr->SrcAddr, ppUdpHdr->SrcPort,
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ppIpHdr->DstAddr, ppUdpHdr->DstPort,
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packet_data, packet_dataLen))
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/*||
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(packet_v6 && dns_handle_outgoing(ppIpV6Hdr->SrcAddr, ppUdpHdr->SrcPort,
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ppIpV6Hdr->DstAddr, ppUdpHdr->DstPort,
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packet_data, packet_dataLen))*/)
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{
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/* Changing destination IP and port to the values
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* from configuration */
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ppIpHdr->DstAddr = dns_addr;
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if (packet_v4)
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ppIpHdr->DstAddr = dns_addr;
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/*else if (packet_v6)
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ppIpV6Hdr->DstAddr = dns_addr;*/
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ppUdpHdr->DstPort = dns_port;
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should_recalc_checksum = 1;
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}
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