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@ -17,10 +17,12 @@ namespace proxy
@@ -17,10 +17,12 @@ namespace proxy
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static const size_t socks_buffer_size = 8192; |
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static const size_t max_socks_hostname_size = 255; // Limit for socks5 and bad idea to traverse
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struct SOCKSDnsAddress { |
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struct SOCKSDnsAddress |
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{ |
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uint8_t size; |
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char value[max_socks_hostname_size]; |
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void FromString (std::string str) { |
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void FromString (std::string str) |
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{ |
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size = str.length(); |
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if (str.length() > max_socks_hostname_size) size = max_socks_hostname_size; |
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memcpy(value,str.c_str(),size); |
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@ -30,9 +32,11 @@ namespace proxy
@@ -30,9 +32,11 @@ namespace proxy
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}; |
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class SOCKSServer; |
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class SOCKSHandler: public i2p::client::I2PServiceHandler, public std::enable_shared_from_this<SOCKSHandler> { |
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class SOCKSHandler: public i2p::client::I2PServiceHandler, public std::enable_shared_from_this<SOCKSHandler> |
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{ |
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private: |
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enum state { |
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enum state |
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{ |
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GET_SOCKSV, |
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GET_COMMAND, |
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GET_PORT, |
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@ -49,18 +53,21 @@ namespace proxy
@@ -49,18 +53,21 @@ namespace proxy
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GET5_HOST, |
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DONE |
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}; |
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enum authMethods { |
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enum authMethods |
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{ |
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AUTH_NONE = 0, //No authentication, skip to next step
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AUTH_GSSAPI = 1, //GSSAPI authentication
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AUTH_USERPASSWD = 2, //Username and password
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AUTH_UNACCEPTABLE = 0xff //No acceptable method found
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}; |
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enum addrTypes { |
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enum addrTypes |
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{ |
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ADDR_IPV4 = 1, //IPv4 address (4 octets)
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ADDR_DNS = 3, // DNS name (up to 255 octets)
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ADDR_IPV6 = 4 //IPV6 address (16 octets)
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}; |
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enum errTypes { |
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enum errTypes |
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{ |
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SOCKS5_OK = 0, // No error for SOCKS5
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SOCKS5_GEN_FAIL = 1, // General server failure
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SOCKS5_RULE_DENIED = 2, // Connection disallowed by ruleset
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@ -75,16 +82,19 @@ namespace proxy
@@ -75,16 +82,19 @@ namespace proxy
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SOCKS4_IDENTD_MISSING = 92, // Couldn't connect to the identd server
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SOCKS4_IDENTD_DIFFER = 93 // The ID reported by the application and by identd differ
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}; |
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enum cmdTypes { |
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enum cmdTypes |
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{ |
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CMD_CONNECT = 1, // TCP Connect
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CMD_BIND = 2, // TCP Bind
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CMD_UDP = 3 // UDP associate
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}; |
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enum socksVersions { |
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enum socksVersions |
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{ |
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SOCKS4 = 4, // SOCKS4
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SOCKS5 = 5 // SOCKS5
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}; |
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union address { |
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union address |
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{ |
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uint32_t ip; |
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SOCKSDnsAddress dns; |
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uint8_t ipv6[16]; |
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@ -136,24 +146,26 @@ namespace proxy
@@ -136,24 +146,26 @@ namespace proxy
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void SOCKSHandler::AsyncSockRead() |
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{ |
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LogPrint(eLogDebug,"--- SOCKS async sock read"); |
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if(m_sock) { |
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if(m_sock) |
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m_sock->async_receive(boost::asio::buffer(m_sock_buff, socks_buffer_size), |
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std::bind(&SOCKSHandler::HandleSockRecv, shared_from_this(), |
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std::placeholders::_1, std::placeholders::_2)); |
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} else { |
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else |
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LogPrint(eLogError,"--- SOCKS no socket for read"); |
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} |
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} |
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void SOCKSHandler::Terminate() { |
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void SOCKSHandler::Terminate() |
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{ |
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if (Kill()) return; |
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if (m_sock) { |
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if (m_sock) |
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{ |
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LogPrint(eLogDebug,"--- SOCKS close sock"); |
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m_sock->close(); |
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delete m_sock; |
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m_sock = nullptr; |
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} |
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if (m_stream) { |
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if (m_stream) |
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{ |
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LogPrint(eLogDebug,"--- SOCKS close stream"); |
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m_stream.reset (); |
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} |
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@ -170,8 +182,7 @@ namespace proxy
@@ -170,8 +182,7 @@ namespace proxy
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return boost::asio::const_buffers_1(m_response,8); |
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} |
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boost::asio::const_buffers_1 SOCKSHandler::GenerateSOCKS5Response(SOCKSHandler::errTypes error, SOCKSHandler::addrTypes type, |
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const SOCKSHandler::address &addr, uint16_t port) |
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boost::asio::const_buffers_1 SOCKSHandler::GenerateSOCKS5Response(SOCKSHandler::errTypes error, SOCKSHandler::addrTypes type, const SOCKSHandler::address &addr, uint16_t port) |
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{ |
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size_t size = 6; |
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assert(error <= SOCKS5_ADDR_UNSUP); |
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@ -179,7 +190,8 @@ namespace proxy
@@ -179,7 +190,8 @@ namespace proxy
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m_response[1] = error; //Response code
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m_response[2] = '\x00'; //RSV
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m_response[3] = type; //Address type
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switch (type) { |
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switch (type) |
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{ |
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case ADDR_IPV4: |
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size = 10; |
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htobe32buf(m_response+4,addr.ip); |
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@ -203,12 +215,15 @@ namespace proxy
@@ -203,12 +215,15 @@ namespace proxy
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m_response[0] = '\x05'; //Version
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m_response[1] = m_authchosen; //Response code
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boost::asio::const_buffers_1 response(m_response,2); |
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if (m_authchosen == AUTH_UNACCEPTABLE) { |
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if (m_authchosen == AUTH_UNACCEPTABLE) |
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{ |
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LogPrint(eLogWarning,"--- SOCKS5 authentication negotiation failed"); |
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boost::asio::async_write(*m_sock, response, std::bind(&SOCKSHandler::SentSocksFailed, |
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shared_from_this(), std::placeholders::_1)); |
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return false; |
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} else { |
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} |
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else |
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{ |
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LogPrint(eLogDebug,"--- SOCKS5 choosing authentication method: ", m_authchosen); |
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boost::asio::async_write(*m_sock, response, std::bind(&SOCKSHandler::SentSocksResponse, |
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shared_from_this(), std::placeholders::_1)); |
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@ -221,16 +236,17 @@ namespace proxy
@@ -221,16 +236,17 @@ namespace proxy
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{ |
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boost::asio::const_buffers_1 response(nullptr,0); |
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assert(error != SOCKS4_OK && error != SOCKS5_OK); |
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switch (m_socksv) { |
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switch (m_socksv) |
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{ |
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case SOCKS4: |
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LogPrint(eLogWarning,"--- SOCKS4 failed: ", error); |
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if (error < SOCKS4_OK) error = SOCKS4_FAIL; //Transparently map SOCKS5 errors
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response = GenerateSOCKS4Response(error, m_4aip, m_port); |
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break; |
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break; |
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case SOCKS5: |
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LogPrint(eLogWarning,"--- SOCKS5 failed: ", error); |
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response = GenerateSOCKS5Response(error, m_addrtype, m_address, m_port); |
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break; |
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break; |
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} |
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boost::asio::async_write(*m_sock, response, std::bind(&SOCKSHandler::SentSocksFailed, |
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shared_from_this(), std::placeholders::_1)); |
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@ -240,25 +256,27 @@ namespace proxy
@@ -240,25 +256,27 @@ namespace proxy
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{ |
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boost::asio::const_buffers_1 response(nullptr,0); |
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//TODO: this should depend on things like the command type and callbacks may change
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switch (m_socksv) { |
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switch (m_socksv) |
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{ |
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case SOCKS4: |
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LogPrint(eLogInfo,"--- SOCKS4 connection success"); |
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response = GenerateSOCKS4Response(SOCKS4_OK, m_4aip, m_port); |
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break; |
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break; |
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case SOCKS5: |
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LogPrint(eLogInfo,"--- SOCKS5 connection success"); |
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auto s = i2p::client::context.GetAddressBook().ToAddress(GetOwner()->GetLocalDestination()->GetIdentHash()); |
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address ad; ad.dns.FromString(s); |
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//HACK only 16 bits passed in port as SOCKS5 doesn't allow for more
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response = GenerateSOCKS5Response(SOCKS5_OK, ADDR_DNS, ad, m_stream->GetRecvStreamID()); |
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break; |
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break; |
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} |
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boost::asio::async_write(*m_sock, response, std::bind(&SOCKSHandler::SentSocksDone, |
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shared_from_this(), std::placeholders::_1)); |
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} |
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void SOCKSHandler::EnterState(SOCKSHandler::state nstate, uint8_t parseleft) { |
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switch (nstate) { |
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switch (nstate) |
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{ |
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case GET_PORT: parseleft = 2; break; |
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case GET_IPV4: m_addrtype = ADDR_IPV4; m_address.ip = 0; parseleft = 4; break; |
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case GET4_IDENT: m_4aip = m_address.ip; break; |
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@ -271,28 +289,33 @@ namespace proxy
@@ -271,28 +289,33 @@ namespace proxy
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m_state = nstate; |
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} |
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bool SOCKSHandler::ValidateSOCKSRequest() { |
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if ( m_cmd != CMD_CONNECT ) { |
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bool SOCKSHandler::ValidateSOCKSRequest() |
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{ |
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if ( m_cmd != CMD_CONNECT ) |
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{ |
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//TODO: we need to support binds and other shit!
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LogPrint(eLogError,"--- SOCKS unsupported command: ", m_cmd); |
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SocksRequestFailed(SOCKS5_CMD_UNSUP); |
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return false; |
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} |
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//TODO: we may want to support other address types!
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if ( m_addrtype != ADDR_DNS ) { |
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switch (m_socksv) { |
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if ( m_addrtype != ADDR_DNS ) |
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{ |
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switch (m_socksv) |
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{ |
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case SOCKS5: |
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LogPrint(eLogError,"--- SOCKS5 unsupported address type: ", m_addrtype); |
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break; |
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break; |
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case SOCKS4: |
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LogPrint(eLogError,"--- SOCKS4a rejected because it's actually SOCKS4"); |
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break; |
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break; |
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} |
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SocksRequestFailed(SOCKS5_ADDR_UNSUP); |
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return false; |
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} |
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//TODO: we may want to support other domains
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if(m_addrtype == ADDR_DNS && m_address.dns.ToString().find(".i2p") == std::string::npos) { |
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if(m_addrtype == ADDR_DNS && m_address.dns.ToString().find(".i2p") == std::string::npos) |
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{ |
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LogPrint(eLogError,"--- SOCKS invalid hostname: ", m_address.dns.ToString()); |
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SocksRequestFailed(SOCKS5_ADDR_UNSUP); |
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return false; |
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@ -303,40 +326,45 @@ namespace proxy
@@ -303,40 +326,45 @@ namespace proxy
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bool SOCKSHandler::HandleData(uint8_t *sock_buff, std::size_t len) |
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{ |
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assert(len); // This should always be called with a least a byte left to parse
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while (len > 0) { |
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switch (m_state) { |
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while (len > 0) |
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{ |
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switch (m_state) |
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{ |
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case GET_SOCKSV: |
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m_socksv = (SOCKSHandler::socksVersions) *sock_buff; |
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switch (*sock_buff) { |
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switch (*sock_buff) |
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{ |
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case SOCKS4: |
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EnterState(GET_COMMAND); //Initialize the parser at the right position
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break; |
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break; |
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case SOCKS5: |
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EnterState(GET5_AUTHNUM); //Initialize the parser at the right position
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break; |
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break; |
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default: |
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LogPrint(eLogError,"--- SOCKS rejected invalid version: ", ((int)*sock_buff)); |
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Terminate(); |
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return false; |
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} |
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break; |
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break; |
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case GET5_AUTHNUM: |
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EnterState(GET5_AUTH, *sock_buff); |
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break; |
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break; |
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case GET5_AUTH: |
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m_parseleft --; |
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if (*sock_buff == AUTH_NONE) |
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m_authchosen = AUTH_NONE; |
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if ( m_parseleft == 0 ) { |
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if ( m_parseleft == 0 ) |
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{ |
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if (!Socks5ChooseAuth()) return false; |
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EnterState(GET5_REQUESTV); |
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} |
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break; |
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break; |
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case GET_COMMAND: |
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switch (*sock_buff) { |
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switch (*sock_buff) |
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{ |
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case CMD_CONNECT: |
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case CMD_BIND: |
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break; |
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break; |
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case CMD_UDP: |
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if (m_socksv == SOCKS5) break; |
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default: |
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@ -345,70 +373,80 @@ namespace proxy
@@ -345,70 +373,80 @@ namespace proxy
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return false; |
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} |
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m_cmd = (SOCKSHandler::cmdTypes)*sock_buff; |
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switch (m_socksv) { |
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switch (m_socksv) |
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{ |
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case SOCKS5: EnterState(GET5_GETRSV); break; |
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case SOCKS4: EnterState(GET_PORT); break; |
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} |
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break; |
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break; |
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case GET_PORT: |
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m_port = (m_port << 8)|((uint16_t)*sock_buff); |
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m_parseleft--; |
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if (m_parseleft == 0) { |
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switch (m_socksv) { |
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if (m_parseleft == 0) |
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{ |
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switch (m_socksv) |
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{ |
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case SOCKS5: EnterState(DONE); break; |
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case SOCKS4: EnterState(GET_IPV4); break; |
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} |
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} |
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break; |
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break; |
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case GET_IPV4: |
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m_address.ip = (m_address.ip << 8)|((uint32_t)*sock_buff); |
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m_parseleft--; |
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if (m_parseleft == 0) { |
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switch (m_socksv) { |
|
|
|
|
if (m_parseleft == 0) |
|
|
|
|
{ |
|
|
|
|
switch (m_socksv) |
|
|
|
|
{ |
|
|
|
|
case SOCKS5: EnterState(GET_PORT); break; |
|
|
|
|
case SOCKS4: EnterState(GET4_IDENT); m_4aip = m_address.ip; break; |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
break; |
|
|
|
|
break; |
|
|
|
|
case GET4_IDENT: |
|
|
|
|
if (!*sock_buff) { |
|
|
|
|
if( m_4aip == 0 || m_4aip > 255 ) { |
|
|
|
|
if (!*sock_buff) |
|
|
|
|
{ |
|
|
|
|
if( m_4aip == 0 || m_4aip > 255 ) |
|
|
|
|
EnterState(DONE); |
|
|
|
|
} else { |
|
|
|
|
else |
|
|
|
|
EnterState(GET4A_HOST); |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
break; |
|
|
|
|
break; |
|
|
|
|
case GET4A_HOST: |
|
|
|
|
if (!*sock_buff) { |
|
|
|
|
if (!*sock_buff) |
|
|
|
|
{ |
|
|
|
|
EnterState(DONE); |
|
|
|
|
break; |
|
|
|
|
} |
|
|
|
|
if (m_address.dns.size >= max_socks_hostname_size) { |
|
|
|
|
if (m_address.dns.size >= max_socks_hostname_size) |
|
|
|
|
{ |
|
|
|
|
LogPrint(eLogError,"--- SOCKS4a destination is too large"); |
|
|
|
|
SocksRequestFailed(SOCKS4_FAIL); |
|
|
|
|
return false; |
|
|
|
|
} |
|
|
|
|
m_address.dns.push_back(*sock_buff); |
|
|
|
|
break; |
|
|
|
|
break; |
|
|
|
|
case GET5_REQUESTV: |
|
|
|
|
if (*sock_buff != SOCKS5) { |
|
|
|
|
if (*sock_buff != SOCKS5) |
|
|
|
|
{ |
|
|
|
|
LogPrint(eLogError,"--- SOCKS5 rejected unknown request version: ", ((int)*sock_buff)); |
|
|
|
|
SocksRequestFailed(SOCKS5_GEN_FAIL); |
|
|
|
|
return false; |
|
|
|
|
} |
|
|
|
|
EnterState(GET_COMMAND); |
|
|
|
|
break; |
|
|
|
|
break; |
|
|
|
|
case GET5_GETRSV: |
|
|
|
|
if ( *sock_buff != 0 ) { |
|
|
|
|
if ( *sock_buff != 0 ) |
|
|
|
|
{ |
|
|
|
|
LogPrint(eLogError,"--- SOCKS5 unknown reserved field: ", ((int)*sock_buff)); |
|
|
|
|
SocksRequestFailed(SOCKS5_GEN_FAIL); |
|
|
|
|
return false; |
|
|
|
|
} |
|
|
|
|
EnterState(GET5_GETADDRTYPE); |
|
|
|
|
break; |
|
|
|
|
break; |
|
|
|
|
case GET5_GETADDRTYPE: |
|
|
|
|
switch (*sock_buff) { |
|
|
|
|
switch (*sock_buff) |
|
|
|
|
{ |
|
|
|
|
case ADDR_IPV4: EnterState(GET_IPV4); break; |
|
|
|
|
case ADDR_IPV6: EnterState(GET5_IPV6); break; |
|
|
|
|
case ADDR_DNS : EnterState(GET5_HOST_SIZE); break; |
|
|
|
@ -417,20 +455,20 @@ namespace proxy
@@ -417,20 +455,20 @@ namespace proxy
|
|
|
|
|
SocksRequestFailed(SOCKS5_GEN_FAIL); |
|
|
|
|
return false; |
|
|
|
|
} |
|
|
|
|
break; |
|
|
|
|
break; |
|
|
|
|
case GET5_IPV6: |
|
|
|
|
m_address.ipv6[16-m_parseleft] = *sock_buff; |
|
|
|
|
m_parseleft--; |
|
|
|
|
if (m_parseleft == 0) EnterState(GET_PORT); |
|
|
|
|
break; |
|
|
|
|
break; |
|
|
|
|
case GET5_HOST_SIZE: |
|
|
|
|
EnterState(GET5_HOST, *sock_buff); |
|
|
|
|
break; |
|
|
|
|
break; |
|
|
|
|
case GET5_HOST: |
|
|
|
|
m_address.dns.push_back(*sock_buff); |
|
|
|
|
m_parseleft--; |
|
|
|
|
if (m_parseleft == 0) EnterState(GET_PORT); |
|
|
|
|
break; |
|
|
|
|
break; |
|
|
|
|
default: |
|
|
|
|
LogPrint(eLogError,"--- SOCKS parse state?? ", m_state); |
|
|
|
|
Terminate(); |
|
|
|
@ -438,7 +476,8 @@ namespace proxy
@@ -438,7 +476,8 @@ namespace proxy
|
|
|
|
|
} |
|
|
|
|
sock_buff++; |
|
|
|
|
len--; |
|
|
|
|
if (m_state == DONE) { |
|
|
|
|
if (m_state == DONE) |
|
|
|
|
{ |
|
|
|
|
m_remaining_data_len = len; |
|
|
|
|
m_remaining_data = sock_buff; |
|
|
|
|
return ValidateSOCKSRequest(); |
|
|
|
@ -450,29 +489,32 @@ namespace proxy
@@ -450,29 +489,32 @@ namespace proxy
|
|
|
|
|
void SOCKSHandler::HandleSockRecv(const boost::system::error_code & ecode, std::size_t len) |
|
|
|
|
{ |
|
|
|
|
LogPrint(eLogDebug,"--- SOCKS sock recv: ", len); |
|
|
|
|
if(ecode) { |
|
|
|
|
if(ecode) |
|
|
|
|
{ |
|
|
|
|
LogPrint(eLogWarning," --- SOCKS sock recv got error: ", ecode); |
|
|
|
|
Terminate(); |
|
|
|
|
Terminate(); |
|
|
|
|
return; |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
if (HandleData(m_sock_buff, len)) { |
|
|
|
|
if (m_state == DONE) { |
|
|
|
|
if (HandleData(m_sock_buff, len)) |
|
|
|
|
{ |
|
|
|
|
if (m_state == DONE) |
|
|
|
|
{ |
|
|
|
|
LogPrint(eLogInfo,"--- SOCKS requested ", m_address.dns.ToString(), ":" , m_port); |
|
|
|
|
GetOwner()->CreateStream ( std::bind (&SOCKSHandler::HandleStreamRequestComplete, |
|
|
|
|
shared_from_this(), std::placeholders::_1), m_address.dns.ToString(), m_port); |
|
|
|
|
} else { |
|
|
|
|
} |
|
|
|
|
else |
|
|
|
|
AsyncSockRead(); |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
void SOCKSHandler::SentSocksFailed(const boost::system::error_code & ecode) |
|
|
|
|
{ |
|
|
|
|
if (!ecode) { |
|
|
|
|
if (!ecode) |
|
|
|
|
Terminate(); |
|
|
|
|
} else { |
|
|
|
|
else |
|
|
|
|
{ |
|
|
|
|
LogPrint (eLogError,"--- SOCKS Closing socket after sending failure because: ", ecode.message ()); |
|
|
|
|
Terminate(); |
|
|
|
|
} |
|
|
|
@ -480,8 +522,9 @@ namespace proxy
@@ -480,8 +522,9 @@ namespace proxy
|
|
|
|
|
|
|
|
|
|
void SOCKSHandler::SentSocksDone(const boost::system::error_code & ecode) |
|
|
|
|
{ |
|
|
|
|
if (!ecode) { |
|
|
|
|
if (Kill()) return; |
|
|
|
|
if (!ecode) |
|
|
|
|
{ |
|
|
|
|
if (Kill()) return; |
|
|
|
|
LogPrint (eLogInfo,"--- SOCKS New I2PTunnel connection"); |
|
|
|
|
auto connection = std::make_shared<i2p::client::I2PTunnelConnection>(GetOwner(), m_sock, m_stream); |
|
|
|
|
GetOwner()->AddHandler (connection); |
|
|
|
@ -497,7 +540,8 @@ namespace proxy
@@ -497,7 +540,8 @@ namespace proxy
|
|
|
|
|
|
|
|
|
|
void SOCKSHandler::SentSocksResponse(const boost::system::error_code & ecode) |
|
|
|
|
{ |
|
|
|
|
if (ecode) { |
|
|
|
|
if (ecode) |
|
|
|
|
{ |
|
|
|
|
LogPrint (eLogError,"--- SOCKS Closing socket after sending reply because: ", ecode.message ()); |
|
|
|
|
Terminate(); |
|
|
|
|
} |
|
|
|
@ -505,17 +549,20 @@ namespace proxy
@@ -505,17 +549,20 @@ namespace proxy
|
|
|
|
|
|
|
|
|
|
void SOCKSHandler::HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream) |
|
|
|
|
{ |
|
|
|
|
if (stream) { |
|
|
|
|
if (stream) |
|
|
|
|
{ |
|
|
|
|
m_stream = stream; |
|
|
|
|
SocksRequestSuccess(); |
|
|
|
|
} else { |
|
|
|
|
} |
|
|
|
|
else |
|
|
|
|
{ |
|
|
|
|
LogPrint (eLogError,"--- SOCKS Issue when creating the stream, check the previous warnings for more info."); |
|
|
|
|
SocksRequestFailed(SOCKS5_HOST_UNREACH); |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
SOCKSServer::SOCKSServer(int port) : |
|
|
|
|
TCPIPAcceptor (port, i2p::client::context.GetSharedLocalDestination ()) |
|
|
|
|
SOCKSServer::SOCKSServer(int port, std::shared_ptr<i2p::client::ClientDestination> localDestination) : |
|
|
|
|
TCPIPAcceptor (port, localDestination ? localDestination : i2p::client::context.GetSharedLocalDestination ()) |
|
|
|
|
{ |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|