resiprocate/reTurn/AsyncTcpSocketBase.cxx

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <functional>

#include "AsyncTcpSocketBase.hxx"
#include "AsyncSocketBaseHandler.hxx"
#include <rutil/Logger.hxx>
#include "ReTurnSubsystem.hxx"

#define RESIPROCATE_SUBSYSTEM ReTurnSubsystem::RETURN

using namespace std;

namespace reTurn {

AsyncTcpSocketBase::AsyncTcpSocketBase(asio::io_context& ioService) 
 : AsyncSocketBase(ioService),
   mSocket(ioService), 
   mResolver(ioService)
{
}

unsigned int 
AsyncTcpSocketBase::getSocketDescriptor() 
{ 
   return (unsigned int)mSocket.native_handle(); 
}

asio::error_code 
AsyncTcpSocketBase::bind(const asio::ip::address& address, unsigned short port)
{
   asio::error_code errorCode;
   mSocket.open(address.is_v6() ? asio::ip::tcp::v6() : asio::ip::tcp::v4(), errorCode);
   if(!errorCode)
   {
      mSocket.set_option(asio::ip::tcp::no_delay(true), errorCode); // ?slg? do we want this?
      mSocket.set_option(asio::ip::tcp::socket::reuse_address(true), errorCode);
      mSocket.bind(asio::ip::tcp::endpoint(address, port), errorCode);
   }   
   return errorCode;
}

void 
AsyncTcpSocketBase::connect(const std::string& address, unsigned short port)
{
   // Start an asynchronous resolve to translate the address
   // into a list of endpoints.
   resip::Data service(port);
   mResolver.async_resolve(mSocket.local_endpoint().protocol(), address, service.c_str(),
        std::bind(&AsyncSocketBase::handleTcpResolve, shared_from_this(),
                    std::placeholders::_1,
                    std::placeholders::_2));
}

void 
AsyncTcpSocketBase::handleTcpResolve(const asio::error_code& ec,
                                     const asio::ip::tcp::resolver::results_type& endpoints)
{
   if (!ec)
   {
      // Attempt a connection to the first endpoint in the list. Each endpoint
      // will be tried until we successfully establish a connection.
      //asio::ip::tcp::endpoint endpoint = *endpoint_iterator;
      asio::async_connect(mSocket, endpoints,
                            std::bind(&AsyncSocketBase::handleConnect, shared_from_this(),
                            std::placeholders::_1, std::placeholders::_2));
   }
   else
   {
      onConnectFailure(ec);
   }
}

void 
AsyncTcpSocketBase::handleConnect(const asio::error_code& ec,
                                  const asio::ip::tcp::endpoint& endpoint)
{
   if (!ec)
   {
      // The connection was successful.
      mConnected = true;
      mConnectedAddress = endpoint.address();
      mConnectedPort = endpoint.port();

      onConnectSuccess();
   }
   else
   {
      onConnectFailure(ec);
   }
}

void
AsyncTcpSocketBase::setConnectedAddressAndPort()
{
   asio::error_code ec;
   mConnectedAddress = mSocket.remote_endpoint(ec).address();
   mConnectedPort = mSocket.remote_endpoint(ec).port();
}

asio::ip::address 
AsyncTcpSocketBase::getSenderEndpointAddress() 
{ 
   return mConnectedAddress; 
}

unsigned short 
AsyncTcpSocketBase::getSenderEndpointPort() 
{ 
   return mConnectedPort; 
}

void 
AsyncTcpSocketBase::transportSend(const StunTuple& destination, std::vector<asio::const_buffer>& buffers)
{
   // Note: destination is ignored for TCP
   asio::async_write(mSocket, buffers, 
                     std::bind(&AsyncTcpSocketBase::handleSend, shared_from_this(), std::placeholders::_1));
}

void 
AsyncTcpSocketBase::transportReceive()
{
   mSocket.async_read_some(asio::buffer((void*)mReceiveBuffer->data(), RECEIVE_BUFFER_SIZE),
                           std::bind(&AsyncTcpSocketBase::handleReceive, shared_from_this(), std::placeholders::_1, std::placeholders::_2));
}

void 
AsyncTcpSocketBase::transportFramedReceive()
{
   asio::async_read(mSocket, asio::buffer((void*)mReceiveBuffer->data(), 4),
                    std::bind(&AsyncSocketBase::handleReadHeader, shared_from_this(), std::placeholders::_1));
}

void 
AsyncTcpSocketBase::handleReadHeader(const asio::error_code& e)
{
   if (!e)
   {
      /*      
      std::cout << "Read header from tcp socket: " << std::endl;
      for(unsigned int i = 0; i < 4; i++)
      {
         std::cout << (char)(*mReceiveBuffer)[i] << "(" << (int)(*mReceiveBuffer)[i] << ") ";
      }
      std::cout << std::endl;
      */

      // Note:  For both StunMessages and ChannelData messages the length in bytes 3 and 4
      uint16_t dataLen;
      memcpy(&dataLen, &(*mReceiveBuffer)[2], 2);
      dataLen = ntohs(dataLen);

      if(((*mReceiveBuffer)[0] & 0xC0) == 0)  // If first 2 bits are 00 then this is a stun message
      {
         dataLen += 16;  // There are 20 bytes in total in the header, and we have already read 4 - read the rest of the header + the body
      }
      if (dataLen + 4U < RECEIVE_BUFFER_SIZE)
      {
         asio::async_read(mSocket, asio::buffer(&(*mReceiveBuffer)[4], dataLen),
                          std::bind(&AsyncTcpSocketBase::handleReceive, shared_from_this(), std::placeholders::_1, dataLen+4));
      }
      else
      {
         WarningLog(<< "Receive buffer (" << RECEIVE_BUFFER_SIZE << ") is not large enough to accommodate incoming framed data (" << dataLen+4 << ") closing connection.");
         close();
      }
   }
   else if (e != asio::error::operation_aborted)
   {
      if(e != asio::error::eof && 
#ifdef _WIN32
         e.value() != ERROR_CONNECTION_ABORTED &&  // This happens on Windows 7 when closing the socket
#endif
         e != asio::error::connection_reset)
      {
         WarningLog(<< "Read header error: " << e.value() << "-" << e.message());
      }
      close();
   }
}

void 
AsyncTcpSocketBase::transportClose()
{
   if (mOnBeforeSocketCloseFp)
   {
      mOnBeforeSocketCloseFp((unsigned int)mSocket.native_handle());
   }

   asio::error_code ec;
   mSocket.close(ec);
}

}


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 Copyright (c) 2008-2018, SIP Spectrum, Inc.
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