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614 lines
17 KiB
C++
614 lines
17 KiB
C++
#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 "Destination.h"
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#include "SAM.h"
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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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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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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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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);
|
|
}
|
|
I2PReceive ();
|
|
}
|
|
}
|
|
|
|
SAMBridge::SAMBridge (int port):
|
|
m_IsRunning (false), m_Thread (nullptr),
|
|
m_Acceptor (m_Service, boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), port)),
|
|
m_NewSocket (nullptr)
|
|
{
|
|
}
|
|
|
|
SAMBridge::~SAMBridge ()
|
|
{
|
|
Stop ();
|
|
delete m_NewSocket;
|
|
}
|
|
|
|
void SAMBridge::Start ()
|
|
{
|
|
Accept ();
|
|
m_IsRunning = true;
|
|
m_Thread = new std::thread (std::bind (&SAMBridge::Run, this));
|
|
}
|
|
|
|
void SAMBridge::Stop ()
|
|
{
|
|
m_IsRunning = false;
|
|
m_Service.stop ();
|
|
if (m_Thread)
|
|
{
|
|
m_Thread->join ();
|
|
delete m_Thread;
|
|
m_Thread = nullptr;
|
|
}
|
|
}
|
|
|
|
void SAMBridge::Run ()
|
|
{
|
|
while (m_IsRunning)
|
|
{
|
|
try
|
|
{
|
|
m_Service.run ();
|
|
}
|
|
catch (std::exception& ex)
|
|
{
|
|
LogPrint ("SAM: ", ex.what ());
|
|
}
|
|
}
|
|
}
|
|
|
|
void SAMBridge::Accept ()
|
|
{
|
|
m_NewSocket = new SAMSocket (*this);
|
|
m_Acceptor.async_accept (m_NewSocket->GetSocket (), boost::bind (&SAMBridge::HandleAccept, this,
|
|
boost::asio::placeholders::error));
|
|
}
|
|
|
|
void SAMBridge::HandleAccept(const boost::system::error_code& ecode)
|
|
{
|
|
if (!ecode)
|
|
{
|
|
LogPrint ("New SAM connection from ", m_NewSocket->GetSocket ().remote_endpoint ());
|
|
m_NewSocket->ReceiveHandshake ();
|
|
}
|
|
else
|
|
{
|
|
LogPrint ("SAM accept error: ", ecode.message ());
|
|
delete m_NewSocket;
|
|
m_NewSocket = nullptr;
|
|
}
|
|
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
Accept ();
|
|
}
|
|
|
|
SAMSession * SAMBridge::CreateSession (const std::string& id, const std::string& destination)
|
|
{
|
|
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;
|
|
}
|
|
}
|
|
}
|