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Totterynine
358
engine/socketcreator.cpp
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358
engine/socketcreator.cpp
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//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose: Utility class to help in socket creation. Works for clients + servers
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//
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//===========================================================================//
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#if defined(_WIN32)
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#if !defined(_X360)
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#include <winsock.h>
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#endif
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#undef SetPort // winsock screws with the SetPort string... *sigh*
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#define socklen_t int
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#define MSG_NOSIGNAL 0
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#elif POSIX
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#define closesocket close
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#define WSAGetLastError() errno
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#define ioctlsocket ioctl
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#ifdef OSX
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#define MSG_NOSIGNAL 0
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#endif
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#endif
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#include <tier0/dbg.h>
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#include "socketcreator.h"
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#include "server.h"
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#if defined( _X360 )
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#include "xbox/xbox_win32stubs.h"
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#endif
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// memdbgon must be the last include file in a .cpp file!!!
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#include "tier0/memdbgon.h"
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bool SocketWouldBlock()
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{
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#ifdef _WIN32
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return (WSAGetLastError() == WSAEWOULDBLOCK);
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#elif POSIX
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return (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINPROGRESS);
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#endif
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}
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//-----------------------------------------------------------------------------
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// Purpose: Constructor
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//-----------------------------------------------------------------------------
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CSocketCreator::CSocketCreator( ISocketCreatorListener *pListener )
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{
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m_hListenSocket = -1;
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m_pListener = pListener;
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}
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//-----------------------------------------------------------------------------
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// Purpose: Destructor
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//-----------------------------------------------------------------------------
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CSocketCreator::~CSocketCreator()
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{
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Disconnect();
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}
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//-----------------------------------------------------------------------------
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// Purpose: returns true if the listening socket is created and listening
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//-----------------------------------------------------------------------------
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bool CSocketCreator::IsListening() const
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{
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return m_hListenSocket != -1;
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}
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//-----------------------------------------------------------------------------
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// Purpose: Bind to a TCP port and accept incoming connections
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//-----------------------------------------------------------------------------
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bool CSocketCreator::CreateListenSocket( const netadr_t &netAdr )
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{
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CloseListenSocket();
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m_ListenAddress = netAdr;
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m_hListenSocket = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
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if ( m_hListenSocket == -1 )
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{
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Warning( "Socket unable to create socket (%s)\n", NET_ErrorString( WSAGetLastError() ) );
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return false;
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}
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if ( !ConfigureSocket( m_hListenSocket ) )
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{
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CloseListenSocket();
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return false;
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}
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struct sockaddr_in s;
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m_ListenAddress.ToSockadr( (struct sockaddr *)&s );
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int ret = bind( m_hListenSocket, (struct sockaddr *)&s, sizeof(struct sockaddr_in) );
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if ( ret == -1 )
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{
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Warning( "Socket bind failed (%s)\n", NET_ErrorString( WSAGetLastError() ) );
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CloseListenSocket();
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return false;
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}
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ret = listen( m_hListenSocket, SOCKET_TCP_MAX_ACCEPTS );
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if ( ret == -1 )
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{
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Warning( "Socket listen failed (%s)\n", NET_ErrorString( WSAGetLastError() ) );
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CloseListenSocket();
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return false;
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}
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return true;
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}
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//-----------------------------------------------------------------------------
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// Configures a socket for use
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//-----------------------------------------------------------------------------
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bool CSocketCreator::ConfigureSocket( int sock )
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{
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// disable NAGLE (rcon cmds are small in size)
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int nodelay = 1;
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setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (char*)&nodelay, sizeof(nodelay));
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nodelay = 1;
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setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char*)&nodelay, sizeof(nodelay));
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int opt = 1, ret;
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ret = ioctlsocket( sock, FIONBIO, (unsigned long*)&opt ); // non-blocking
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if ( ret == -1 )
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{
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Warning( "Socket accept ioctl(FIONBIO) failed (%i)\n", WSAGetLastError() );
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return false;
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}
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return true;
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}
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//-----------------------------------------------------------------------------
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// Purpose: Handle a new connection
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//-----------------------------------------------------------------------------
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void CSocketCreator::ProcessAccept()
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{
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int newSocket;
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sockaddr sa;
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int nLengthAddr = sizeof(sa);
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newSocket = accept( m_hListenSocket, &sa, (socklen_t *)&nLengthAddr );
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if ( newSocket == -1 )
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{
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if ( !SocketWouldBlock()
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#ifdef POSIX
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&& errno != EINTR
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#endif
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)
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{
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Warning ("Socket ProcessAccept Error: %s\n", NET_ErrorString( WSAGetLastError() ) );
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}
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return;
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}
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if ( !ConfigureSocket( newSocket ) )
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{
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closesocket( newSocket );
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return;
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}
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netadr_t adr;
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adr.SetFromSockadr( &sa );
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if ( m_pListener && !m_pListener->ShouldAcceptSocket( newSocket, adr ) )
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{
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closesocket( newSocket );
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return;
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}
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// new connection TCP request, put in accepted queue
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int nIndex = m_hAcceptedSockets.AddToTail();
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AcceptedSocket_t *pNewEntry = &m_hAcceptedSockets[nIndex];
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pNewEntry->m_hSocket = newSocket;
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pNewEntry->m_Address = adr;
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pNewEntry->m_pData = NULL;
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void* pData = NULL;
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if ( m_pListener )
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{
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m_pListener->OnSocketAccepted( newSocket, adr, &pData );
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}
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pNewEntry->m_pData = pData;
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}
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//-----------------------------------------------------------------------------
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// Purpose: connect to the remote server
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//-----------------------------------------------------------------------------
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int CSocketCreator::ConnectSocket( const netadr_t &netAdr, bool bSingleSocket )
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{
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if ( bSingleSocket )
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{
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CloseAllAcceptedSockets();
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}
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SocketHandle_t hSocket = socket( PF_INET, SOCK_STREAM, IPPROTO_TCP );
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if ( hSocket == -1 )
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{
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Warning( "Unable to create socket (%s)\n", NET_ErrorString( WSAGetLastError() ) );
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return -1;
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}
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int opt = 1, ret;
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ret = ioctlsocket( hSocket, FIONBIO, (unsigned long*)&opt ); // non-blocking
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if ( ret == -1 )
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{
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Warning( "Socket ioctl(FIONBIO) failed (%s)\n", NET_ErrorString( WSAGetLastError() ) );
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closesocket( hSocket );
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return -1;
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}
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// disable NAGLE (rcon cmds are small in size)
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int nodelay = 1;
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setsockopt( hSocket, IPPROTO_TCP, TCP_NODELAY, (char*)&nodelay, sizeof(nodelay) );
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struct sockaddr_in s;
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netAdr.ToSockadr( (struct sockaddr *)&s );
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ret = connect( hSocket, (struct sockaddr *)&s, sizeof(s));
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if ( ret == -1 )
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{
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if ( !SocketWouldBlock() )
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{
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Warning( "Socket connection failed (%s)\n", NET_ErrorString( WSAGetLastError() ) );
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closesocket( hSocket );
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return -1;
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}
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fd_set writefds;
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struct timeval tv;
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tv.tv_usec = 0;
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tv.tv_sec = 1;
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FD_ZERO( &writefds );
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FD_SET( static_cast<u_int>( hSocket ), &writefds );
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if ( select ( hSocket + 1, NULL, &writefds, NULL, &tv ) < 1 ) // block for at most 1 second
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{
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closesocket( hSocket ); // took too long to connect to, give up
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return -1;
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}
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}
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if ( m_pListener && !m_pListener->ShouldAcceptSocket( hSocket, netAdr ) )
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{
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closesocket( hSocket );
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return -1;
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}
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// new connection TCP request, put in accepted queue
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void *pData = NULL;
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int nIndex = m_hAcceptedSockets.AddToTail();
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AcceptedSocket_t *pNewEntry = &m_hAcceptedSockets[nIndex];
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pNewEntry->m_hSocket = hSocket;
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pNewEntry->m_Address = netAdr;
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pNewEntry->m_pData = NULL;
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if ( m_pListener )
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{
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m_pListener->OnSocketAccepted( hSocket, netAdr, &pData );
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}
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pNewEntry->m_pData = pData;
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return nIndex;
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}
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//-----------------------------------------------------------------------------
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// Purpose: close an open rcon connection
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//-----------------------------------------------------------------------------
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void CSocketCreator::CloseListenSocket()
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{
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if ( m_hListenSocket != -1 )
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{
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closesocket( m_hListenSocket );
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m_hListenSocket = -1;
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}
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}
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void CSocketCreator::CloseAcceptedSocket( int nIndex )
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{
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if ( nIndex >= m_hAcceptedSockets.Count() )
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return;
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AcceptedSocket_t& connected = m_hAcceptedSockets[nIndex];
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if ( m_pListener )
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{
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m_pListener->OnSocketClosed( connected.m_hSocket, connected.m_Address, connected.m_pData );
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}
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closesocket( connected.m_hSocket );
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m_hAcceptedSockets.Remove( nIndex );
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}
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void CSocketCreator::CloseAllAcceptedSockets()
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{
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int nCount = m_hAcceptedSockets.Count();
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for ( int i = 0; i < nCount; ++i )
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{
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AcceptedSocket_t& connected = m_hAcceptedSockets[i];
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if ( m_pListener )
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{
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m_pListener->OnSocketClosed( connected.m_hSocket, connected.m_Address, connected.m_pData );
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}
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closesocket( connected.m_hSocket );
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}
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m_hAcceptedSockets.RemoveAll();
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}
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void CSocketCreator::Disconnect()
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{
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CloseListenSocket();
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CloseAllAcceptedSockets();
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}
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//-----------------------------------------------------------------------------
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// Purpose: accept new connections and walk open sockets and handle any incoming data
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//-----------------------------------------------------------------------------
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void CSocketCreator::RunFrame()
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{
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if ( IsListening() )
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{
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ProcessAccept(); // handle any new connection requests
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}
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}
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//-----------------------------------------------------------------------------
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// Returns socket info
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//-----------------------------------------------------------------------------
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int CSocketCreator::GetAcceptedSocketCount() const
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{
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return m_hAcceptedSockets.Count();
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}
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SocketHandle_t CSocketCreator::GetAcceptedSocketHandle( int nIndex ) const
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{
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return m_hAcceptedSockets[nIndex].m_hSocket;
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}
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const netadr_t& CSocketCreator::GetAcceptedSocketAddress( int nIndex ) const
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{
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return m_hAcceptedSockets[nIndex].m_Address;
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}
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void* CSocketCreator::GetAcceptedSocketData( int nIndex )
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{
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return m_hAcceptedSockets[nIndex].m_pData;
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}
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