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https://github.com/netchx/netch.git
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86 lines
2.1 KiB
C++
86 lines
2.1 KiB
C++
#include "DNSHandler.h"
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extern string dnsHost;
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extern USHORT dnsPort;
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SOCKADDR_IN6 dnsAddr;
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void ProcessPacket(ENDPOINT_ID id, SOCKADDR_IN6 target, const char* packet, int length, PNF_UDP_OPTIONS options)
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{
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char buffer[1024];
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auto tcpSocket = SocksHelper::Utils::Connect();
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if (tcpSocket != INVALID_SOCKET)
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{
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if (SocksHelper::Utils::Handshake(tcpSocket))
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{
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SocksHelper::UDP udpConn;
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udpConn.tcpSocket = tcpSocket;
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if (udpConn.Associate())
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{
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if (udpConn.CreateUDP())
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{
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if (udpConn.Send(&dnsAddr, packet, length) == length)
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{
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int size = udpConn.Read(NULL, buffer, sizeof(buffer));
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if (size != 0 && size != SOCKET_ERROR)
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{
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nf_udpPostReceive(id, (unsigned char*)&target, buffer, size, options);
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}
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}
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}
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}
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}
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}
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delete options;
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delete[] packet;
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}
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bool DNSHandler::Init()
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{
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memset(&dnsAddr, 0, sizeof(SOCKADDR_IN6));
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auto ipv4 = (PSOCKADDR_IN)&dnsAddr;
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if (inet_pton(AF_INET, dnsHost.c_str(), &ipv4->sin_addr) == 1)
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{
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ipv4->sin_family = AF_INET;
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ipv4->sin_port = htons(dnsPort);
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return true;
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}
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if (inet_pton(AF_INET6, dnsHost.c_str(), &dnsAddr.sin6_addr) == 1)
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{
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dnsAddr.sin6_family = AF_INET6;
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dnsAddr.sin6_port = htons(dnsPort);
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return true;
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}
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puts("[Redirector][DNSHandler::Init] Call WSAStringToAddress failed");
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return false;
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}
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bool DNSHandler::IsDNS(PSOCKADDR_IN6 target)
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{
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if (target->sin6_family == AF_INET)
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{
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return ((PSOCKADDR_IN)target)->sin_port == htons(53);
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}
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return target->sin6_port == htons(53);
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}
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void DNSHandler::CreateHandler(ENDPOINT_ID id, PSOCKADDR_IN6 target, const char* packet, int length, PNF_UDP_OPTIONS options)
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{
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SOCKADDR_IN6 remote;
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auto buffer = new char[length]();
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auto option = (PNF_UDP_OPTIONS)new char[sizeof(NF_UDP_OPTIONS) + options->optionsLength];
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memcpy(&remote, target, sizeof(SOCKADDR_IN6));
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memcpy(buffer, packet, length);
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memcpy(option, options, sizeof(NF_UDP_OPTIONS) + options->optionsLength - 1);
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thread(ProcessPacket, id, remote, buffer, length, option).detach();
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}
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