mirror of https://github.com/PurpleI2P/i2pd.git
I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
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612 lines
17 KiB
612 lines
17 KiB
#include <string.h> |
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#include <stdio.h> |
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#include <boost/bind.hpp> |
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#include "base64.h" |
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#include "Identity.h" |
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#include "Log.h" |
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#include "NetDb.h" |
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#include "SAM.h" |
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|
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namespace i2p |
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{ |
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namespace stream |
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{ |
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SAMSocket::SAMSocket (SAMBridge& owner): |
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m_Owner (owner), m_Socket (m_Owner.GetService ()), m_Timer (m_Owner.GetService ()), |
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m_SocketType (eSAMSocketTypeUnknown), m_IsSilent (false), m_Stream (nullptr), |
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m_Session (nullptr) |
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{ |
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} |
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SAMSocket::~SAMSocket () |
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{ |
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if (m_Stream) |
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{ |
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m_Stream->Close (); |
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DeleteStream (m_Stream); |
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} |
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} |
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|
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void SAMSocket::Terminate () |
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{ |
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if (m_Stream) |
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{ |
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m_Stream->Close (); |
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DeleteStream (m_Stream); |
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m_Stream = nullptr; |
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} |
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switch (m_SocketType) |
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{ |
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case eSAMSocketTypeSession: |
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m_Owner.CloseSession (m_ID); |
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break; |
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case eSAMSocketTypeStream: |
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{ |
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auto session = m_Owner.FindSession (m_ID); |
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if (session) |
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session->sockets.remove (this); |
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break; |
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} |
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case eSAMSocketTypeAcceptor: |
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{ |
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auto session = m_Owner.FindSession (m_ID); |
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if (session) |
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{ |
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session->sockets.remove (this); |
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session->localDestination->ResetAcceptor (); |
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} |
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break; |
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} |
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default: |
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; |
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} |
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delete this; |
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} |
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void SAMSocket::ReceiveHandshake () |
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{ |
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m_Socket.async_read_some (boost::asio::buffer(m_Buffer, SAM_SOCKET_BUFFER_SIZE), |
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boost::bind(&SAMSocket::HandleHandshakeReceived, this, |
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boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); |
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} |
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void SAMSocket::HandleHandshakeReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred) |
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{ |
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if (ecode) |
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{ |
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LogPrint ("SAM handshake read error: ", ecode.message ()); |
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if (ecode != boost::asio::error::operation_aborted) |
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Terminate (); |
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} |
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else |
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{ |
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m_Buffer[bytes_transferred] = 0; |
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LogPrint ("SAM handshake ", m_Buffer); |
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if (!memcmp (m_Buffer, SAM_HANDSHAKE, strlen (SAM_HANDSHAKE))) |
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{ |
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// TODO: check version |
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boost::asio::async_write (m_Socket, boost::asio::buffer (SAM_HANDSHAKE_REPLY, strlen (SAM_HANDSHAKE_REPLY)), boost::asio::transfer_all (), |
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boost::bind(&SAMSocket::HandleHandshakeReplySent, this, |
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boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); |
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} |
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else |
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{ |
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LogPrint ("SAM handshake mismatch"); |
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Terminate (); |
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} |
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} |
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} |
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void SAMSocket::HandleHandshakeReplySent (const boost::system::error_code& ecode, std::size_t bytes_transferred) |
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{ |
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if (ecode) |
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{ |
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LogPrint ("SAM handshake reply send error: ", ecode.message ()); |
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if (ecode != boost::asio::error::operation_aborted) |
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Terminate (); |
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} |
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else |
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{ |
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m_Socket.async_read_some (boost::asio::buffer(m_Buffer, SAM_SOCKET_BUFFER_SIZE), |
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boost::bind(&SAMSocket::HandleMessage, this, |
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boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); |
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} |
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} |
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void SAMSocket::SendMessageReply (const char * msg, size_t len, bool close) |
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{ |
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if (!m_IsSilent || m_SocketType == eSAMSocketTypeAcceptor) |
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boost::asio::async_write (m_Socket, boost::asio::buffer (msg, len), boost::asio::transfer_all (), |
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boost::bind(&SAMSocket::HandleMessageReplySent, this, |
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boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred, close)); |
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else |
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{ |
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if (close) |
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Terminate (); |
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else |
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Receive (); |
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} |
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} |
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void SAMSocket::HandleMessageReplySent (const boost::system::error_code& ecode, std::size_t bytes_transferred, bool close) |
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{ |
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if (ecode) |
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{ |
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LogPrint ("SAM reply send error: ", ecode.message ()); |
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if (ecode != boost::asio::error::operation_aborted) |
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Terminate (); |
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} |
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else |
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{ |
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if (close) |
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Terminate (); |
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else |
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Receive (); |
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} |
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} |
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void SAMSocket::HandleMessage (const boost::system::error_code& ecode, std::size_t bytes_transferred) |
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{ |
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if (ecode) |
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{ |
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LogPrint ("SAM read error: ", ecode.message ()); |
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if (ecode != boost::asio::error::operation_aborted) |
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Terminate (); |
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} |
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else |
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{ |
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m_Buffer[bytes_transferred] = 0; |
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char * eol = strchr (m_Buffer, '\n'); |
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if (eol) |
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{ |
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*eol = 0; |
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char * separator = strchr (m_Buffer, ' '); |
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if (separator) |
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{ |
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separator = strchr (separator + 1, ' '); |
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if (separator) |
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*separator = 0; |
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else |
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separator = eol; |
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if (!strcmp (m_Buffer, SAM_SESSION_CREATE)) |
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ProcessSessionCreate (separator + 1, bytes_transferred - (separator - m_Buffer) - 1); |
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else if (!strcmp (m_Buffer, SAM_STREAM_CONNECT)) |
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ProcessStreamConnect (separator + 1, bytes_transferred - (separator - m_Buffer) - 1); |
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else if (!strcmp (m_Buffer, SAM_STREAM_ACCEPT)) |
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ProcessStreamAccept (separator + 1, bytes_transferred - (separator - m_Buffer) - 1); |
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else if (!strcmp (m_Buffer, SAM_DEST_GENERATE)) |
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ProcessDestGenerate (); |
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else if (!strcmp (m_Buffer, SAM_NAMING_LOOKUP)) |
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ProcessNamingLookup (separator + 1, bytes_transferred - (separator - m_Buffer) - 1); |
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else |
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{ |
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LogPrint ("SAM unexpected message ", m_Buffer); |
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Terminate (); |
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} |
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} |
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else |
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{ |
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LogPrint ("SAM malformed message ", m_Buffer); |
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Terminate (); |
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} |
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} |
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else |
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{ |
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LogPrint ("SAM malformed message ", m_Buffer); |
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Terminate (); |
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} |
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} |
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} |
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void SAMSocket::ProcessSessionCreate (char * buf, size_t len) |
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{ |
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LogPrint ("SAM session create: ", buf); |
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std::map<std::string, std::string> params; |
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ExtractParams (buf, len, params); |
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std::string& id = params[SAM_PARAM_ID]; |
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std::string& destination = params[SAM_PARAM_DESTINATION]; |
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m_ID = id; |
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if (m_Owner.FindSession (id)) |
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{ |
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// session exists |
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SendMessageReply (SAM_SESSION_CREATE_DUPLICATED_ID, strlen(SAM_SESSION_CREATE_DUPLICATED_ID), true); |
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return; |
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} |
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m_Session = m_Owner.CreateSession (id, destination == SAM_VALUE_TRANSIENT ? "" : destination); |
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if (m_Session) |
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{ |
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m_SocketType = eSAMSocketTypeSession; |
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uint8_t buf[1024]; |
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char priv[1024]; |
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size_t l = m_Session->localDestination->GetPrivateKeys ().ToBuffer (buf, 1024); |
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size_t l1 = i2p::data::ByteStreamToBase64 (buf, l, priv, 1024); |
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priv[l1] = 0; |
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size_t l2 = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_SESSION_CREATE_REPLY_OK, priv); |
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SendMessageReply (m_Buffer, l2, false); |
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} |
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else |
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SendMessageReply (SAM_SESSION_CREATE_DUPLICATED_DEST, strlen(SAM_SESSION_CREATE_DUPLICATED_DEST), true); |
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} |
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void SAMSocket::ProcessStreamConnect (char * buf, size_t len) |
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{ |
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LogPrint ("SAM stream connect: ", buf); |
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std::map<std::string, std::string> params; |
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ExtractParams (buf, len, params); |
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std::string& id = params[SAM_PARAM_ID]; |
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std::string& destination = params[SAM_PARAM_DESTINATION]; |
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std::string& silent = params[SAM_PARAM_SILENT]; |
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if (silent == SAM_VALUE_TRUE) m_IsSilent = true; |
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m_ID = id; |
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auto session = m_Owner.FindSession (id); |
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if (session) |
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{ |
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uint8_t ident[1024]; |
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size_t l = i2p::data::Base64ToByteStream (destination.c_str (), destination.length (), ident, 1024); |
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i2p::data::IdentityEx dest; |
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dest.FromBuffer (ident, l); |
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auto leaseSet = i2p::data::netdb.FindLeaseSet (dest.GetIdentHash ()); |
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if (leaseSet) |
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Connect (*leaseSet, session); |
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else |
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{ |
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i2p::data::netdb.RequestDestination (dest.GetIdentHash (), true, session->localDestination->GetTunnelPool ()); |
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m_Timer.expires_from_now (boost::posix_time::seconds(SAM_CONNECT_TIMEOUT)); |
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m_Timer.async_wait (boost::bind (&SAMSocket::HandleStreamDestinationRequestTimer, |
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this, boost::asio::placeholders::error, dest.GetIdentHash (), session)); |
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} |
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} |
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else |
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SendMessageReply (SAM_STREAM_STATUS_INVALID_ID, strlen(SAM_STREAM_STATUS_INVALID_ID), true); |
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} |
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void SAMSocket::Connect (const i2p::data::LeaseSet& remote, SAMSession * session) |
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{ |
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m_SocketType = eSAMSocketTypeStream; |
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session->sockets.push_back (this); |
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m_Stream = session->localDestination->CreateNewOutgoingStream (remote); |
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m_Stream->Send ((uint8_t *)m_Buffer, 0); // connect |
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I2PReceive (); |
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SendMessageReply (SAM_STREAM_STATUS_OK, strlen(SAM_STREAM_STATUS_OK), false); |
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} |
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void SAMSocket::HandleStreamDestinationRequestTimer (const boost::system::error_code& ecode, i2p::data::IdentHash ident, SAMSession * session) |
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{ |
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if (!ecode) // timeout expired |
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{ |
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auto leaseSet = i2p::data::netdb.FindLeaseSet (ident); |
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if (leaseSet) |
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Connect (*leaseSet, session); |
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else |
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{ |
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LogPrint ("SAM destination to connect not found"); |
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SendMessageReply (SAM_STREAM_STATUS_CANT_REACH_PEER, strlen(SAM_STREAM_STATUS_CANT_REACH_PEER), true); |
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} |
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} |
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} |
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void SAMSocket::HandleNamingLookupDestinationRequestTimer (const boost::system::error_code& ecode, i2p::data::IdentHash ident) |
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{ |
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if (!ecode) // timeout expired |
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{ |
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auto leaseSet = i2p::data::netdb.FindLeaseSet (ident); |
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if (leaseSet) |
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SendNamingLookupReply (leaseSet); |
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else |
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{ |
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LogPrint ("SAM name destination not found"); |
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size_t len = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_NAMING_REPLY_KEY_NOT_FOUND, (ident.ToBase32 () + ".b32.i2p").c_str ()); |
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SendMessageReply (m_Buffer, len, false); |
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} |
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} |
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} |
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void SAMSocket::ProcessStreamAccept (char * buf, size_t len) |
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{ |
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LogPrint ("SAM stream accept: ", buf); |
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std::map<std::string, std::string> params; |
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ExtractParams (buf, len, params); |
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std::string& id = params[SAM_PARAM_ID]; |
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std::string& silent = params[SAM_PARAM_SILENT]; |
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if (silent == SAM_VALUE_TRUE) m_IsSilent = true; |
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m_ID = id; |
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auto session = m_Owner.FindSession (id); |
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if (session) |
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{ |
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if (!session->localDestination->IsAcceptorSet ()) |
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{ |
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m_SocketType = eSAMSocketTypeAcceptor; |
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session->sockets.push_back (this); |
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session->localDestination->SetAcceptor (std::bind (&SAMSocket::HandleI2PAccept, this, std::placeholders::_1)); |
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SendMessageReply (SAM_STREAM_STATUS_OK, strlen(SAM_STREAM_STATUS_OK), false); |
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} |
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else |
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SendMessageReply (SAM_STREAM_STATUS_I2P_ERROR, strlen(SAM_STREAM_STATUS_I2P_ERROR), true); |
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} |
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else |
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SendMessageReply (SAM_STREAM_STATUS_INVALID_ID, strlen(SAM_STREAM_STATUS_INVALID_ID), true); |
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} |
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void SAMSocket::ProcessDestGenerate () |
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{ |
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LogPrint ("SAM dest generate"); |
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auto localDestination = CreateNewLocalDestination (); |
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if (localDestination) |
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{ |
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uint8_t buf[1024]; |
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char priv[1024], pub[1024]; |
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size_t l = localDestination->GetPrivateKeys ().ToBuffer (buf, 1024); |
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size_t l1 = i2p::data::ByteStreamToBase64 (buf, l, priv, 1024); |
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priv[l1] = 0; |
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l = localDestination->GetIdentity ().ToBuffer (buf, 1024); |
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l1 = i2p::data::ByteStreamToBase64 (buf, l, pub, 1024); |
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pub[l1] = 0; |
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size_t len = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_DEST_REPLY, pub, priv); |
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SendMessageReply (m_Buffer, len, true); |
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} |
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else |
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SendMessageReply (SAM_DEST_REPLY_I2P_ERROR, strlen(SAM_DEST_REPLY_I2P_ERROR), true); |
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} |
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void SAMSocket::ProcessNamingLookup (char * buf, size_t len) |
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{ |
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LogPrint ("SAM naming lookup: ", buf); |
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std::map<std::string, std::string> params; |
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ExtractParams (buf, len, params); |
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std::string& name = params[SAM_PARAM_NAME]; |
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i2p::data::IdentHash ident; |
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if (name == "ME") |
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SendNamingLookupReply (nullptr); |
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else if (i2p::data::netdb.GetAddressBook ().GetIdentHash (name, ident)) |
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{ |
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auto leaseSet = i2p::data::netdb.FindLeaseSet (ident); |
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if (leaseSet) |
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SendNamingLookupReply (leaseSet); |
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else |
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{ |
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i2p::data::netdb.RequestDestination (ident, true, m_Session->localDestination->GetTunnelPool ()); |
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m_Timer.expires_from_now (boost::posix_time::seconds(SAM_NAMING_LOOKUP_TIMEOUT)); |
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m_Timer.async_wait (boost::bind (&SAMSocket::HandleNamingLookupDestinationRequestTimer, |
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this, boost::asio::placeholders::error, ident)); |
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} |
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} |
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else |
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{ |
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size_t len = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_NAMING_REPLY_INVALID_KEY, name.c_str()); |
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SendMessageReply (m_Buffer, len, false); |
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} |
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} |
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void SAMSocket::SendNamingLookupReply (i2p::data::LeaseSet * leaseSet) |
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{ |
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uint8_t buf[1024]; |
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char pub[1024]; |
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const i2p::data::IdentityEx& identity = leaseSet ? leaseSet->GetIdentity () : m_Session->localDestination->GetIdentity (); |
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size_t l = identity.ToBuffer (buf, 1024); |
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size_t l1 = i2p::data::ByteStreamToBase64 (buf, l, pub, 1024); |
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pub[l1] = 0; |
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size_t l2 = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_NAMING_REPLY, pub); |
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SendMessageReply (m_Buffer, l2, false); |
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} |
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void SAMSocket::ExtractParams (char * buf, size_t len, std::map<std::string, std::string>& params) |
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{ |
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char * separator; |
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do |
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{ |
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separator = strchr (buf, ' '); |
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if (separator) *separator = 0; |
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char * value = strchr (buf, '='); |
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if (value) |
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{ |
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*value = 0; |
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value++; |
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params[buf] = value; |
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} |
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buf = separator + 1; |
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} |
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while (separator); |
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} |
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void SAMSocket::Receive () |
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{ |
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m_Socket.async_read_some (boost::asio::buffer(m_Buffer, SAM_SOCKET_BUFFER_SIZE), |
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boost::bind((m_SocketType == eSAMSocketTypeSession) ? &SAMSocket::HandleMessage : &SAMSocket::HandleReceived, |
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this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); |
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} |
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void SAMSocket::HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred) |
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{ |
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if (ecode) |
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{ |
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LogPrint ("SAM read error: ", ecode.message ()); |
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if (ecode != boost::asio::error::operation_aborted) |
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Terminate (); |
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} |
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else |
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{ |
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if (m_Stream) |
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m_Stream->Send ((uint8_t *)m_Buffer, bytes_transferred); |
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Receive (); |
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} |
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} |
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void SAMSocket::I2PReceive () |
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{ |
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if (m_Stream) |
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m_Stream->AsyncReceive (boost::asio::buffer (m_StreamBuffer, SAM_SOCKET_BUFFER_SIZE), |
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boost::bind (&SAMSocket::HandleI2PReceive, this, |
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boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred), |
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SAM_SOCKET_CONNECTION_MAX_IDLE); |
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} |
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|
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void SAMSocket::HandleI2PReceive (const boost::system::error_code& ecode, std::size_t bytes_transferred) |
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{ |
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if (ecode) |
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{ |
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LogPrint ("SAM stream read error: ", ecode.message ()); |
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if (ecode != boost::asio::error::operation_aborted) |
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Terminate (); |
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} |
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else |
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{ |
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boost::asio::async_write (m_Socket, boost::asio::buffer (m_StreamBuffer, bytes_transferred), |
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boost::bind (&SAMSocket::HandleWriteI2PData, this, boost::asio::placeholders::error)); |
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} |
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} |
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void SAMSocket::HandleWriteI2PData (const boost::system::error_code& ecode) |
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{ |
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if (ecode) |
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{ |
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LogPrint ("SAM socket write error: ", ecode.message ()); |
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if (ecode != boost::asio::error::operation_aborted) |
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Terminate (); |
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} |
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else |
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I2PReceive (); |
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} |
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|
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void SAMSocket::HandleI2PAccept (i2p::stream::Stream * stream) |
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{ |
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if (stream) |
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{ |
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m_Stream = stream; |
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auto session = m_Owner.FindSession (m_ID); |
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if (session) |
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session->localDestination->ResetAcceptor (); |
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if (!m_IsSilent) |
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{ |
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// send remote peer address |
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uint8_t ident[1024]; |
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size_t l = stream->GetRemoteIdentity ().ToBuffer (ident, 1024); |
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size_t l1 = i2p::data::ByteStreamToBase64 (ident, l, m_Buffer, SAM_SOCKET_BUFFER_SIZE); |
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m_Buffer[l1] = '\n'; |
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SendMessageReply (m_Buffer, l1 + 1, false); |
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} |
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I2PReceive (); |
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} |
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} |
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|
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SAMBridge::SAMBridge (int port): |
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m_IsRunning (false), m_Thread (nullptr), |
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m_Acceptor (m_Service, boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), port)), |
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m_NewSocket (nullptr) |
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{ |
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} |
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|
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SAMBridge::~SAMBridge () |
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{ |
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Stop (); |
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delete m_NewSocket; |
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} |
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|
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void SAMBridge::Start () |
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{ |
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Accept (); |
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m_IsRunning = true; |
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m_Thread = new std::thread (std::bind (&SAMBridge::Run, this)); |
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} |
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|
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void SAMBridge::Stop () |
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{ |
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m_IsRunning = false; |
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m_Service.stop (); |
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if (m_Thread) |
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{ |
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m_Thread->join (); |
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delete m_Thread; |
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m_Thread = nullptr; |
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} |
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} |
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|
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void SAMBridge::Run () |
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{ |
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while (m_IsRunning) |
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{ |
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try |
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{ |
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m_Service.run (); |
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} |
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catch (std::exception& ex) |
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{ |
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LogPrint ("SAM: ", ex.what ()); |
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} |
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} |
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} |
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|
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void SAMBridge::Accept () |
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{ |
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m_NewSocket = new SAMSocket (*this); |
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m_Acceptor.async_accept (m_NewSocket->GetSocket (), boost::bind (&SAMBridge::HandleAccept, this, |
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boost::asio::placeholders::error)); |
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} |
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|
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void SAMBridge::HandleAccept(const boost::system::error_code& ecode) |
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{ |
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if (!ecode) |
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{ |
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LogPrint ("New SAM connection from ", m_NewSocket->GetSocket ().remote_endpoint ()); |
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m_NewSocket->ReceiveHandshake (); |
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} |
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else |
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{ |
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LogPrint ("SAM accept error: ", ecode.message ()); |
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delete m_NewSocket; |
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m_NewSocket = nullptr; |
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} |
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|
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if (ecode != boost::asio::error::operation_aborted) |
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Accept (); |
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} |
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|
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SAMSession * SAMBridge::CreateSession (const std::string& id, const std::string& destination) |
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{ |
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StreamingDestination * localDestination = nullptr; |
|
if (destination != "") |
|
{ |
|
uint8_t * buf = new uint8_t[destination.length ()]; |
|
size_t l = i2p::data::Base64ToByteStream (destination.c_str (), destination.length (), buf, destination.length ()); |
|
i2p::data::PrivateKeys keys; |
|
keys.FromBuffer (buf, l); |
|
delete[] buf; |
|
localDestination = CreateNewLocalDestination (keys); |
|
} |
|
else // transient |
|
localDestination = CreateNewLocalDestination (); |
|
if (localDestination) |
|
{ |
|
SAMSession session; |
|
session.localDestination = localDestination; |
|
auto ret = m_Sessions.insert (std::pair<std::string, SAMSession>(id, session)); |
|
if (!ret.second) |
|
LogPrint ("Session ", id, " already exists"); |
|
return &(ret.first->second); |
|
} |
|
return nullptr; |
|
} |
|
|
|
void SAMBridge::CloseSession (const std::string& id) |
|
{ |
|
auto it = m_Sessions.find (id); |
|
if (it != m_Sessions.end ()) |
|
{ |
|
for (auto it1 : it->second.sockets) |
|
delete it1; |
|
it->second.sockets.clear (); |
|
DeleteLocalDestination (it->second.localDestination); |
|
m_Sessions.erase (it); |
|
} |
|
} |
|
|
|
SAMSession * SAMBridge::FindSession (const std::string& id) |
|
{ |
|
auto it = m_Sessions.find (id); |
|
if (it != m_Sessions.end ()) |
|
return &it->second; |
|
return nullptr; |
|
} |
|
} |
|
}
|
|
|