629 lines
16 KiB
C++
629 lines
16 KiB
C++
//
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// Created by Grishka on 29.03.17.
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//
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#include "NetworkSocket.h"
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#include <stdexcept>
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#include <algorithm>
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#include <stdlib.h>
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#include <string.h>
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#if defined(_WIN32)
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#include "os/windows/NetworkSocketWinsock.h"
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#include <winsock2.h>
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#else
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#include "os/posix/NetworkSocketPosix.h"
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#endif
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#include "logging.h"
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#include "VoIPServerConfig.h"
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#include "VoIPController.h"
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#include "Buffers.h"
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#define MIN_UDP_PORT 16384
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#define MAX_UDP_PORT 32768
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using namespace tgvoip;
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NetworkSocket::NetworkSocket(NetworkProtocol protocol) : protocol(protocol){
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ipv6Timeout=ServerConfig::GetSharedInstance()->GetDouble("nat64_fallback_timeout", 3);
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failed=false;
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proxyAddress=NULL;
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proxyPort=0;
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proxyUsername=NULL;
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proxyPassword=NULL;
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}
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NetworkSocket::~NetworkSocket(){
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}
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std::string NetworkSocket::GetLocalInterfaceInfo(IPv4Address *inet4addr, IPv6Address *inet6addr){
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std::string r="not implemented";
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return r;
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}
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uint16_t NetworkSocket::GenerateLocalPort(){
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return (uint16_t) ((rand()%(MAX_UDP_PORT-MIN_UDP_PORT))+MIN_UDP_PORT);
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}
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void NetworkSocket::SetMaxPriority(){
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}
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bool NetworkSocket::IsFailed(){
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return failed;
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}
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NetworkSocket *NetworkSocket::Create(NetworkProtocol protocol){
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#ifndef _WIN32
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return new NetworkSocketPosix(protocol);
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#else
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return new NetworkSocketWinsock(protocol);
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#endif
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}
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IPv4Address *NetworkSocket::ResolveDomainName(std::string name){
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#ifndef _WIN32
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return NetworkSocketPosix::ResolveDomainName(name);
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#else
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return NetworkSocketWinsock::ResolveDomainName(name);
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#endif
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}
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void NetworkSocket::SetSocksProxy(IPv4Address *addr, uint16_t port, char *username, char *password){
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proxyAddress=addr;
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proxyPort=port;
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proxyUsername=username;
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proxyPassword=password;
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}
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void NetworkSocket::GenerateTCPO2States(unsigned char* buffer, TCPO2State* recvState, TCPO2State* sendState){
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memset(recvState, 0, sizeof(TCPO2State));
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memset(sendState, 0, sizeof(TCPO2State));
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unsigned char nonce[64];
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uint32_t *first = reinterpret_cast<uint32_t*>(nonce), *second = first + 1;
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uint32_t first1 = 0x44414548U, first2 = 0x54534f50U, first3 = 0x20544547U, first4 = 0x20544547U, first5 = 0xeeeeeeeeU;
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uint32_t second1 = 0;
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do {
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VoIPController::crypto.rand_bytes(nonce, sizeof(nonce));
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} while (*first == first1 || *first == first2 || *first == first3 || *first == first4 || *first == first5 || *second == second1 || *reinterpret_cast<unsigned char*>(nonce) == 0xef);
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// prepare encryption key/iv
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memcpy(sendState->key, nonce + 8, 32);
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memcpy(sendState->iv, nonce + 8 + 32, 16);
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// prepare decryption key/iv
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char reversed[48];
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memcpy(reversed, nonce + 8, sizeof(reversed));
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std::reverse(reversed, reversed + sizeof(reversed));
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memcpy(recvState->key, reversed, 32);
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memcpy(recvState->iv, reversed + 32, 16);
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// write protocol identifier
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*reinterpret_cast<uint32_t*>(nonce + 56) = 0xefefefefU;
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memcpy(buffer, nonce, 56);
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EncryptForTCPO2(nonce, sizeof(nonce), sendState);
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memcpy(buffer+56, nonce+56, 8);
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}
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void NetworkSocket::EncryptForTCPO2(unsigned char *buffer, size_t len, TCPO2State *state){
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VoIPController::crypto.aes_ctr_encrypt(buffer, len, state->key, state->iv, state->ecount, &state->num);
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}
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size_t NetworkSocket::Receive(unsigned char *buffer, size_t len){
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NetworkPacket pkt={0};
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pkt.data=buffer;
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pkt.length=len;
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Receive(&pkt);
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return pkt.length;
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}
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size_t NetworkSocket::Send(unsigned char *buffer, size_t len){
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NetworkPacket pkt={0};
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pkt.data=buffer;
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pkt.length=len;
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Send(&pkt);
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return pkt.length;
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}
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bool NetworkAddress::operator==(const NetworkAddress &other){
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IPv4Address* self4=dynamic_cast<IPv4Address*>(this);
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IPv4Address* other4=dynamic_cast<IPv4Address*>((NetworkAddress*)&other);
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if(self4 && other4){
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return self4->GetAddress()==other4->GetAddress();
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}
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IPv6Address* self6=dynamic_cast<IPv6Address*>(this);
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IPv6Address* other6=dynamic_cast<IPv6Address*>((NetworkAddress*)&other);
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if(self6 && other6){
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return memcmp(self6->GetAddress(), other6->GetAddress(), 16)==0;
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}
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return false;
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}
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bool NetworkAddress::operator!=(const NetworkAddress &other){
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return !(*this == other);
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}
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IPv4Address::IPv4Address(std::string addr){
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#ifndef _WIN32
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this->address=NetworkSocketPosix::StringToV4Address(addr);
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#else
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this->address=NetworkSocketWinsock::StringToV4Address(addr);
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#endif
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}
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IPv4Address::IPv4Address(uint32_t addr){
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this->address=addr;
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}
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IPv4Address::IPv4Address(){
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this->address=0;
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}
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std::string IPv4Address::ToString(){
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#ifndef _WIN32
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return NetworkSocketPosix::V4AddressToString(address);
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#else
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return NetworkSocketWinsock::V4AddressToString(address);
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#endif
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}
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/*sockaddr &IPv4Address::ToSockAddr(uint16_t port){
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sockaddr_in sa;
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sa.sin_family=AF_INET;
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sa.sin_addr=addr;
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sa.sin_port=port;
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return *((sockaddr *) &sa);
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}*/
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uint32_t IPv4Address::GetAddress(){
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return address;
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}
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bool IPv4Address::IsEmpty(){
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return address==0;
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}
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IPv6Address::IPv6Address(std::string addr){
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#ifndef _WIN32
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NetworkSocketPosix::StringToV6Address(addr, this->address);
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#else
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NetworkSocketWinsock::StringToV6Address(addr, this->address);
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#endif
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}
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IPv6Address::IPv6Address(const uint8_t* addr){
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memcpy(address, addr, 16);
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}
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IPv6Address::IPv6Address(){
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memset(address, 0, 16);
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}
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std::string IPv6Address::ToString(){
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#ifndef _WIN32
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return NetworkSocketPosix::V6AddressToString(address);
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#else
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return NetworkSocketWinsock::V6AddressToString(address);
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#endif
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}
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bool IPv6Address::IsEmpty(){
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uint64_t* a=reinterpret_cast<uint64_t*>(address);
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return a[0]==0LL && a[1]==0LL;
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}
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/*sockaddr &IPv6Address::ToSockAddr(uint16_t port){
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sockaddr_in6 sa;
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sa.sin6_family=AF_INET6;
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sa.sin6_addr=addr;
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sa.sin6_port=port;
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return *((sockaddr *) &sa);
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}*/
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const uint8_t *IPv6Address::GetAddress(){
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return address;
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}
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bool NetworkSocket::Select(std::vector<NetworkSocket *> &readFds, std::vector<NetworkSocket *> &errorFds, SocketSelectCanceller *canceller){
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#ifndef _WIN32
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return NetworkSocketPosix::Select(readFds, errorFds, canceller);
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#else
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return NetworkSocketWinsock::Select(readFds, errorFds, canceller);
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#endif
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}
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SocketSelectCanceller::~SocketSelectCanceller(){
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}
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SocketSelectCanceller *SocketSelectCanceller::Create(){
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#ifndef _WIN32
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return new SocketSelectCancellerPosix();
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#else
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return new SocketSelectCancellerWin32();
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#endif
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}
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NetworkSocketTCPObfuscated::NetworkSocketTCPObfuscated(NetworkSocket *wrapped) : NetworkSocketWrapper(PROTO_TCP){
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this->wrapped=wrapped;
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}
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NetworkSocketTCPObfuscated::~NetworkSocketTCPObfuscated(){
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if(wrapped)
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delete wrapped;
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}
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NetworkSocket *NetworkSocketTCPObfuscated::GetWrapped(){
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return wrapped;
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}
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void NetworkSocketTCPObfuscated::InitConnection(){
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unsigned char buf[64];
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GenerateTCPO2States(buf, &recvState, &sendState);
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wrapped->Send(buf, 64);
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}
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void NetworkSocketTCPObfuscated::Send(NetworkPacket *packet){
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BufferOutputStream os(packet->length+4);
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size_t len=packet->length/4;
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if(len<0x7F){
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os.WriteByte((unsigned char)len);
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}else{
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os.WriteByte(0x7F);
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os.WriteByte((unsigned char)(len & 0xFF));
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os.WriteByte((unsigned char)((len >> 8) & 0xFF));
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os.WriteByte((unsigned char)((len >> 16) & 0xFF));
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}
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os.WriteBytes(packet->data, packet->length);
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EncryptForTCPO2(os.GetBuffer(), os.GetLength(), &sendState);
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wrapped->Send(os.GetBuffer(), os.GetLength());
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//LOGD("Sent %u bytes", os.GetLength());
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}
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void NetworkSocketTCPObfuscated::Receive(NetworkPacket *packet){
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unsigned char len1;
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size_t packetLen=0;
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size_t offset=0;
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size_t len;
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len=wrapped->Receive(&len1, 1);
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if(len<=0){
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packet->length=0;
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return;
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}
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EncryptForTCPO2(&len1, 1, &recvState);
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if(len1<0x7F){
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packetLen=(size_t)len1*4;
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}else{
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unsigned char len2[3];
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len=wrapped->Receive(len2, 3);
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if(len<=0){
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packet->length=0;
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return;
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}
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EncryptForTCPO2(len2, 3, &recvState);
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packetLen=((size_t)len2[0] | ((size_t)len2[1] << 8) | ((size_t)len2[2] << 16))*4;
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}
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if(packetLen>packet->length){
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LOGW("packet too big to fit into buffer (%u vs %u)", (unsigned int)packetLen, (unsigned int)packet->length);
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packet->length=0;
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return;
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}
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while(offset<packetLen){
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len=wrapped->Receive(packet->data+offset, packetLen-offset);
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if(len<=0){
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packet->length=0;
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return;
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}
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offset+=len;
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}
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EncryptForTCPO2(packet->data, packetLen, &recvState);
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//packet->address=&itr->address;
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packet->length=packetLen;
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//packet->port=itr->port;
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packet->protocol=PROTO_TCP;
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packet->address=wrapped->GetConnectedAddress();
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packet->port=wrapped->GetConnectedPort();
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}
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void NetworkSocketTCPObfuscated::Open(){
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}
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void NetworkSocketTCPObfuscated::Close(){
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wrapped->Close();
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}
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void NetworkSocketTCPObfuscated::Connect(NetworkAddress *address, uint16_t port){
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}
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bool NetworkSocketTCPObfuscated::IsFailed(){
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return wrapped->IsFailed();
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}
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NetworkSocketSOCKS5Proxy::NetworkSocketSOCKS5Proxy(NetworkSocket *tcp, NetworkSocket *udp, std::string username, std::string password) : NetworkSocketWrapper(udp ? PROTO_UDP : PROTO_TCP){
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this->tcp=tcp;
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this->udp=udp;
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this->username=username;
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this->password=password;
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connectedAddress=NULL;
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}
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NetworkSocketSOCKS5Proxy::~NetworkSocketSOCKS5Proxy(){
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delete tcp;
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if(connectedAddress)
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delete connectedAddress;
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}
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void NetworkSocketSOCKS5Proxy::Send(NetworkPacket *packet){
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if(protocol==PROTO_TCP){
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tcp->Send(packet);
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}else if(protocol==PROTO_UDP){
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unsigned char buf[1500];
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BufferOutputStream out(buf, sizeof(buf));
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out.WriteInt16(0); // RSV
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out.WriteByte(0); // FRAG
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IPv4Address* v4=dynamic_cast<IPv4Address*>(packet->address);
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IPv6Address* v6=dynamic_cast<IPv6Address*>(packet->address);
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if(v4){
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out.WriteByte(1); // ATYP (IPv4)
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out.WriteInt32(v4->GetAddress());
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}else{
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out.WriteByte(4); // ATYP (IPv6)
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out.WriteBytes((unsigned char *) v6->GetAddress(), 16);
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}
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out.WriteInt16(htons(packet->port));
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out.WriteBytes(packet->data, packet->length);
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NetworkPacket p={0};
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p.data=buf;
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p.length=out.GetLength();
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p.address=connectedAddress;
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p.port=connectedPort;
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p.protocol=PROTO_UDP;
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udp->Send(&p);
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}
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}
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void NetworkSocketSOCKS5Proxy::Receive(NetworkPacket *packet){
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if(protocol==PROTO_TCP){
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tcp->Receive(packet);
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}else if(protocol==PROTO_UDP){
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unsigned char buf[1500];
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NetworkPacket p={0};
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p.data=buf;
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p.length=sizeof(buf);
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udp->Receive(&p);
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if(p.length && p.address && *p.address==*connectedAddress && p.port==connectedPort){
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BufferInputStream in(buf, p.length);
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in.ReadInt16(); // RSV
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in.ReadByte(); // FRAG
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unsigned char atyp=in.ReadByte();
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if(atyp==1){ // IPv4
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lastRecvdV4=IPv4Address((uint32_t) in.ReadInt32());
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packet->address=&lastRecvdV4;
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}else if(atyp==4){ // IPv6
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unsigned char addr[16];
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in.ReadBytes(addr, 16);
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lastRecvdV6=IPv6Address(addr);
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packet->address=&lastRecvdV6;
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}
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packet->port=ntohs(in.ReadInt16());
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if(packet->length>=in.Remaining()){
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packet->length=in.Remaining();
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in.ReadBytes(packet->data, in.Remaining());
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}else{
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packet->length=0;
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LOGW("socks5: received packet too big");
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}
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}
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}
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}
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void NetworkSocketSOCKS5Proxy::Open(){
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if(protocol==PROTO_UDP){
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unsigned char buf[1024];
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BufferOutputStream out(buf, sizeof(buf));
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out.WriteByte(5); // VER
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out.WriteByte(3); // CMD (UDP ASSOCIATE)
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out.WriteByte(0); // RSV
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out.WriteByte(1); // ATYP (IPv4)
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out.WriteInt32(0); // DST.ADDR
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out.WriteInt16(0); // DST.PORT
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tcp->Send(buf, out.GetLength());
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size_t l=tcp->Receive(buf, sizeof(buf));
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if(l<2 || tcp->IsFailed()){
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LOGW("socks5: udp associate failed");
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failed=true;
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return;
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}
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try{
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BufferInputStream in(buf, l);
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unsigned char ver=in.ReadByte();
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unsigned char rep=in.ReadByte();
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if(ver!=5){
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LOGW("socks5: udp associate: wrong ver in response");
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failed=true;
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return;
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}
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if(rep!=0){
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LOGW("socks5: udp associate failed with error %02X", rep);
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failed=true;
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return;
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}
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in.ReadByte(); // RSV
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unsigned char atyp=in.ReadByte();
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if(atyp==1){
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uint32_t addr=(uint32_t) in.ReadInt32();
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connectedAddress=new IPv4Address(addr);
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}else if(atyp==3){
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unsigned char len=in.ReadByte();
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char domain[256];
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memset(domain, 0, sizeof(domain));
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in.ReadBytes((unsigned char*)domain, len);
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LOGD("address type is domain, address=%s", domain);
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connectedAddress=ResolveDomainName(std::string(domain));
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if(!connectedAddress){
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LOGW("socks5: failed to resolve domain name '%s'", domain);
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failed=true;
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return;
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}
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}else if(atyp==4){
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unsigned char addr[16];
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in.ReadBytes(addr, 16);
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connectedAddress=new IPv6Address(addr);
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}else{
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LOGW("socks5: unknown address type %d", atyp);
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failed=true;
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return;
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}
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connectedPort=(uint16_t)ntohs(in.ReadInt16());
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tcp->SetTimeouts(0, 0);
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LOGV("socks5: udp associate successful, given endpoint %s:%d", connectedAddress->ToString().c_str(), connectedPort);
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}catch(std::out_of_range& x){
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LOGW("socks5: udp associate response parse failed");
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failed=true;
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}
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}
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}
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void NetworkSocketSOCKS5Proxy::Close(){
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tcp->Close();
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}
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void NetworkSocketSOCKS5Proxy::Connect(NetworkAddress *address, uint16_t port){
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if(!failed){
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tcp->SetTimeouts(1, 2);
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unsigned char buf[1024];
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BufferOutputStream out(buf, sizeof(buf));
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out.WriteByte(5); // VER
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out.WriteByte(1); // CMD (CONNECT)
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out.WriteByte(0); // RSV
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IPv4Address* v4=dynamic_cast<IPv4Address*>(address);
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IPv6Address* v6=dynamic_cast<IPv6Address*>(address);
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if(v4){
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out.WriteByte(1); // ATYP (IPv4)
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out.WriteInt32(v4->GetAddress());
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}else if(v6){
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out.WriteByte(4); // ATYP (IPv6)
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out.WriteBytes((unsigned char*)v6->GetAddress(), 16);
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}else{
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LOGW("socks5: unknown address type");
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failed=true;
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return;
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}
|
|
out.WriteInt16(htons(port)); // DST.PORT
|
|
tcp->Send(buf, out.GetLength());
|
|
size_t l=tcp->Receive(buf, sizeof(buf));
|
|
if(l<2 || tcp->IsFailed()){
|
|
LOGW("socks5: connect failed")
|
|
failed=true;
|
|
return;
|
|
}
|
|
BufferInputStream in(buf, l);
|
|
unsigned char ver=in.ReadByte();
|
|
if(ver!=5){
|
|
LOGW("socks5: connect: wrong ver in response");
|
|
failed=true;
|
|
return;
|
|
}
|
|
unsigned char rep=in.ReadByte();
|
|
if(rep!=0){
|
|
LOGW("socks5: connect: failed with error %02X", rep);
|
|
failed=true;
|
|
return;
|
|
}
|
|
connectedAddress=v4 ? (NetworkAddress*)new IPv4Address(*v4) : (NetworkAddress*)new IPv6Address(*v6);
|
|
connectedPort=port;
|
|
LOGV("socks5: connect succeeded");
|
|
tcp->SetTimeouts(5, 60);
|
|
}
|
|
}
|
|
|
|
NetworkSocket *NetworkSocketSOCKS5Proxy::GetWrapped(){
|
|
return protocol==PROTO_TCP ? tcp : udp;
|
|
}
|
|
|
|
void NetworkSocketSOCKS5Proxy::InitConnection(){
|
|
unsigned char buf[1024];
|
|
tcp->SetTimeouts(1, 2);
|
|
BufferOutputStream p(buf, sizeof(buf));
|
|
p.WriteByte(5); // VER
|
|
if(!username.empty()){
|
|
p.WriteByte(2); // NMETHODS
|
|
p.WriteByte(0); // no auth
|
|
p.WriteByte(2); // user/pass
|
|
}else{
|
|
p.WriteByte(1); // NMETHODS
|
|
p.WriteByte(0); // no auth
|
|
}
|
|
tcp->Send(buf, p.GetLength());
|
|
size_t l=tcp->Receive(buf, sizeof(buf));
|
|
if(l<2 || tcp->IsFailed()){
|
|
failed=true;
|
|
return;
|
|
}
|
|
BufferInputStream in(buf, l);
|
|
unsigned char ver=in.ReadByte();
|
|
unsigned char chosenMethod=in.ReadByte();
|
|
LOGV("socks5: VER=%02X, METHOD=%02X", ver, chosenMethod);
|
|
if(ver!=5){
|
|
LOGW("socks5: incorrect VER in response");
|
|
failed=true;
|
|
return;
|
|
}
|
|
if(chosenMethod==0){
|
|
// connected, no further auth needed
|
|
}else if(chosenMethod==2 && !username.empty()){
|
|
p.Reset();
|
|
p.WriteByte(1); // VER
|
|
p.WriteByte((unsigned char)(username.length()>255 ? 255 : username.length())); // ULEN
|
|
p.WriteBytes((unsigned char*)username.c_str(), username.length()>255 ? 255 : username.length()); // UNAME
|
|
p.WriteByte((unsigned char)(password.length()>255 ? 255 : password.length())); // PLEN
|
|
p.WriteBytes((unsigned char*)password.c_str(), password.length()>255 ? 255 : password.length()); // PASSWD
|
|
tcp->Send(buf, p.GetLength());
|
|
l=tcp->Receive(buf, sizeof(buf));
|
|
if(l<2 || tcp->IsFailed()){
|
|
failed=true;
|
|
return;
|
|
}
|
|
in=BufferInputStream(buf, l);
|
|
ver=in.ReadByte();
|
|
unsigned char status=in.ReadByte();
|
|
LOGV("socks5: auth response VER=%02X, STATUS=%02X", ver, status);
|
|
if(ver!=1){
|
|
LOGW("socks5: auth response VER is incorrect");
|
|
failed=true;
|
|
return;
|
|
}
|
|
if(status!=0){
|
|
LOGW("socks5: username/password auth failed");
|
|
failed=true;
|
|
return;
|
|
}
|
|
LOGV("socks5: authentication succeeded");
|
|
}else{
|
|
LOGW("socks5: unsupported auth method");
|
|
failed=true;
|
|
return;
|
|
}
|
|
tcp->SetTimeouts(5, 60);
|
|
}
|
|
|
|
bool NetworkSocketSOCKS5Proxy::IsFailed(){
|
|
return NetworkSocket::IsFailed() || tcp->IsFailed();
|
|
}
|
|
|
|
NetworkAddress *NetworkSocketSOCKS5Proxy::GetConnectedAddress(){
|
|
return connectedAddress;
|
|
}
|
|
|
|
uint16_t NetworkSocketSOCKS5Proxy::GetConnectedPort(){
|
|
return connectedPort;
|
|
}
|