mirror of
https://github.com/netchx/netch.git
synced 2026-03-14 17:43:18 +08:00
84 lines
2.0 KiB
C++
84 lines
2.0 KiB
C++
#include "DNSHandler.h"
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#include "SocksHelper.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 HandleDNS(ENDPOINT_ID id, PSOCKADDR_IN6 target, char* packet, int length, PNF_UDP_OPTIONS option)
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{
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auto remote = new SocksHelper::UDP();
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if (remote->Associate())
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{
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if (remote->CreateUDP())
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{
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if (remote->Send(&dnsAddr, packet, length) == length)
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{
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char buffer[1024];
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timeval timeout{};
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timeout.tv_sec = 4;
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int size = remote->Read(NULL, buffer, sizeof(buffer), &timeout);
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if (size != 0 && size != SOCKET_ERROR)
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nf_udpPostReceive(id, (unsigned char*)target, buffer, size, option);
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}
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}
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}
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delete remote;
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delete target;
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delete[] packet;
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delete[] option;
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}
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bool DNSHandler::INIT()
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{
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memset(&dnsAddr, 0, sizeof(dnsAddr));
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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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auto ipv6 = (PSOCKADDR_IN6)&dnsAddr;
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if (inet_pton(AF_INET6, dnsHost.c_str(), &ipv6->sin6_addr) == 1)
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{
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ipv6->sin6_family = AF_INET6;
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ipv6->sin6_port = htons(dnsPort);
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return true;
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}
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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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else
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{
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return target->sin6_port == htons(53);
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}
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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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auto remote = new SOCKADDR_IN6();
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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(HandleDNS, id, remote, buffer, length, option).detach();
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}
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