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383 lines
8.9 KiB
383 lines
8.9 KiB
#include "precomp.h"
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DEBUG_FILEZONE(ZONE_T120_MSMCSTCP);
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/* Socket.cpp
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*
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* Copyright (c) 1996 by Microsoft Corporation
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*
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* Abstract:
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* This is the implementation of our socket constructor/destructor functions.
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*
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*/
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#include "socket.h"
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#include "plgxprt.h"
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/* Size of listen queue */
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#define LISTEN_QUEUE_SIZE 3
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/* External definitions */
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extern HWND TCP_Window_Handle;
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extern PTransportInterface g_Transport;
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/*
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* void CreateAndConfigureListenSocket (VOID)
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*
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* Functional Description
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* This function sets up a listening socket.
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* returns INVALID_SOCKET if there is any error.
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*/
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SOCKET CreateAndConfigureListenSocket (VOID)
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{
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SOCKADDR_IN socket_control;
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SOCKET Socket;
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// Create the listening socket.
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Socket = socket (AF_INET, SOCK_STREAM, 0);
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if (Socket == INVALID_SOCKET) {
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WARNING_OUT (("Socket: error creating listening socket (errno = %d)", WSAGetLastError()));
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goto Error;
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}
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// The listen socket only waits for FD_ACCEPT msgs.
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ASSERT(TCP_Window_Handle);
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if (WSAAsyncSelect (Socket,
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TCP_Window_Handle,
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WM_SOCKET_NOTIFICATION,
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FD_ACCEPT) != 0) {
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WARNING_OUT (("CreateAndConfigureListenSocket: Error on WSAAsyncSelect = %d", WSAGetLastError()));
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goto Error;
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}
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/*
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* Load the socket control structure with the parameters necessary.
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* - Internet socket
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* - Let it assign any address to this socket
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* - Assign our port number
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*/
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socket_control.sin_family = AF_INET;
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socket_control.sin_addr.s_addr = INADDR_ANY;
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socket_control.sin_port = htons ( DEFAULT_LISTEN_PORT );
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/* Issue the bind call */
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if (bind (Socket, (LPSOCKADDR) &socket_control, sizeof(SOCKADDR_IN)) != 0) {
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WARNING_OUT (("Socket::Listen: bind failed: Unable to use WinSock"));
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goto Error;
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}
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/*
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* Issue a listen to WinSock to tell it we are willing to accept calls.
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* This is a non-blocking listen, therefore we will receive FD_ACCEPT
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* if someone is trying to call us.
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*/
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if (listen (Socket, LISTEN_QUEUE_SIZE) != 0) {
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WARNING_OUT (("Socket::Listen: listen failed: Unable to use WinSock"));
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goto Error;
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}
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ASSERT(Socket != INVALID_SOCKET);
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return Socket;
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Error:
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if (INVALID_SOCKET != Socket)
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{
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::closesocket(Socket);
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}
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return INVALID_SOCKET;
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}
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/*
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* PSocket newSocket (SOCKET socket_number)
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*
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* Functional Description:
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* This is a constructor for the Socket object. It allocates the
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* send and receive buffers and sets up internal variables.
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*/
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PSocket newSocket(TransportConnection XprtConn, PSecurityContext pSC)
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{
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if (IS_SOCKET(XprtConn))
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{
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return ::newSocketEx(XprtConn, pSC);
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}
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return g_pSocketList->FindByTransportConnection(XprtConn, TRUE);
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}
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PSocket newPluggableSocket(TransportConnection XprtConn)
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{
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PSocket pSocket = ::newSocketEx(XprtConn, NULL);
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if (NULL != pSocket)
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{
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g_pSocketList->SafeAppend(pSocket);
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}
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return pSocket;
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}
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PSocket newSocketEx(TransportConnection XprtConn, PSecurityContext pSC)
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{
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BOOL fRet;
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DBG_SAVE_FILE_LINE
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PSocket pSocket = new CSocket(&fRet, XprtConn, pSC);
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if (NULL != pSocket)
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{
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if (fRet)
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{
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return pSocket;
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}
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pSocket->Release();
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}
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ERROR_OUT(("newSocket: Unable to allocate memory for Socket struct, pSocket=0x%x", pSocket));
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return NULL;
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}
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CSocket::CSocket(BOOL *_pfRet, TransportConnection _XprtConn, PSecurityContext _pSC)
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:
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CRefCount(MAKE_STAMP_ID('S','o','c','k')),
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State(IS_SOCKET(_XprtConn) ? NOT_CONNECTED : SOCKET_CONNECTED),
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SecState((NULL == _pSC) ? SC_UNDETERMINED : SC_SECURE),
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pSC(_pSC),
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Max_Packet_Length(DEFAULT_MAX_X224_SIZE),
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Current_Length(0),
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Data_Indication_Buffer(NULL),
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Data_Indication_Length(0),
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Read_State(READ_HEADER),
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X224_Length(0),
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bSpaceAllocated(FALSE),
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Data_Memory(NULL),
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fExtendedX224(FALSE),
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fIncomingSecure(FALSE),
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XprtConn(_XprtConn)
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{
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// assume failure
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*_pfRet = FALSE;
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// zero out sub structures
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::ZeroMemory(&X224_Header, sizeof(X224_Header));
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::ZeroMemory(&Retry_Info, sizeof(Retry_Info));
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Remote_Address[0] = '\0';
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if (IS_SOCKET(XprtConn))
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{
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if (INVALID_SOCKET == XprtConn.nLogicalHandle)
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{
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/* Create a STREAM socket (fully reliable, full duplex, and sequenced) */
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if ((XprtConn.nLogicalHandle = ::socket(AF_INET, SOCK_STREAM, 0))
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== INVALID_SOCKET)
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{
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ERROR_OUT (("CSocket: error acquiring INET socket # (errno = %d)", WSAGetLastError()));
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return;
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}
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}
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/* Enable Tx and Rx messages to the window */
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ASSERT(TCP_Window_Handle);
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if (::WSAAsyncSelect(XprtConn.nLogicalHandle, TCP_Window_Handle,
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WM_SOCKET_NOTIFICATION,
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FD_READ | FD_WRITE | FD_CLOSE | FD_CONNECT) != 0)
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{
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WARNING_OUT (("CSocket: Error on WSAAsyncSelect = %d", WSAGetLastError()));
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}
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}
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else
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{
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ASSERT(IS_PLUGGABLE(XprtConn));
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CPluggableConnection *p = ::GetPluggableConnection(this);
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if (NULL == p)
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{
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ERROR_OUT(("newSocket: Unable to find plugable transport (%d, %d)",
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XprtConn.eType, XprtConn.nLogicalHandle));
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return;
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}
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}
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// success
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*_pfRet = TRUE;
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}
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/*
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* void freeSocket (PSocket, TransportConnection)
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*
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* Functional Description:
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* This is a destructor for the Socket object. It frees the send
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* and receive buffers and connection structure.
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* It will also cleanup the listening socket. In this case,
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* "pSocket" is set to NULL and "trash_packets" should be set to TRUE.
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*/
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void freeSocket(PSocket pSocket, TransportConnection XprtConn)
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{
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if (IS_SOCKET(XprtConn))
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{
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if (NULL != g_pSocketList)
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{
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g_pSocketList->SafeRemove(pSocket);
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}
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freeSocketEx(pSocket, XprtConn);
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}
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}
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void freeListenSocket(TransportConnection XprtConn)
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{
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ASSERT(IS_SOCKET(XprtConn));
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freeSocketEx(NULL, XprtConn);
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}
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void freePluggableSocket(PSocket pSocket)
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{
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freeSocketEx(pSocket, pSocket->XprtConn);
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if (NULL != g_pSocketList)
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{
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g_pSocketList->SafeRemove(pSocket);
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}
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}
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void freeSocketEx(PSocket pSocket, TransportConnection XprtConn)
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{
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// Either "pSocket" is NULL, or the socket is not invalid.
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#ifdef _DEBUG
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if (IS_SOCKET(XprtConn))
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{
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if (NULL != pSocket)
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{
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ASSERT(INVALID_SOCKET != pSocket->XprtConn.nLogicalHandle);
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}
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else
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{
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// it is a listen socket
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ASSERT(INVALID_SOCKET != XprtConn.nLogicalHandle);
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}
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}
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#endif
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// Determine the socket number to use... Either the socket is the
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// socket indicated in the PSocket structure, or it is a structure-less
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// listen socket. Note: both cannot be valid!
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if (IS_SOCKET(XprtConn))
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{
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SOCKET socket = (pSocket) ? pSocket->XprtConn.nLogicalHandle : XprtConn.nLogicalHandle;
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XprtConn.nLogicalHandle = socket;
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/* Disable notifications to our window */
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if (::IsWindow(TCP_Window_Handle))
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{
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::WSAAsyncSelect(socket, TCP_Window_Handle, 0, 0);
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}
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}
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if (pSocket != NULL)
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{
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pSocket->Release();
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}
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else
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{
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// This is the listening socket
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::ShutdownAndClose (XprtConn, FALSE, 0);
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}
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}
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CSocket::~CSocket(void)
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{
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switch (State)
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{
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case SOCKET_CONNECTED:
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// case WAITING_FOR_DISCONNECT:
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/* All physically connected states issue a shutdown() first */
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::ShutdownAndClose(XprtConn, TRUE, SD_BOTH);
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break;
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case X224_CONNECTED:
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// Shutdown disable reception only.
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::ShutdownAndClose(XprtConn, TRUE, SD_RECEIVE);
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break;
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default:
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::ShutdownAndClose(XprtConn, FALSE, 0);
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break;
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}
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/* Free the structures */
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FreeTransportBuffer();
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delete pSC;
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}
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void CSocket::FreeTransportBuffer(void)
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{
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if (NULL != Data_Memory)
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{
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::FreeMemory(Data_Memory);
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Data_Memory = NULL;
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Data_Indication_Buffer = NULL;
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}
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}
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void CSocketList::SafeAppend(PSocket pSocket)
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{
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::EnterCriticalSection(&g_csTransport);
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if (! Find(pSocket))
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{
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Append(pSocket);
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}
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::LeaveCriticalSection(&g_csTransport);
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}
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BOOL CSocketList::SafeRemove(PSocket pSocket)
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{
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::EnterCriticalSection(&g_csTransport);
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BOOL fRet = Remove(pSocket);
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::LeaveCriticalSection(&g_csTransport);
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return fRet;
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}
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PSocket CSocketList::FindByTransportConnection(TransportConnection XprtConn, BOOL fNoAddRef)
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{
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PSocket pSocket;
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::EnterCriticalSection(&g_csTransport);
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Reset();
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while (NULL != (pSocket = Iterate()))
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{
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if (IS_SAME_TRANSPORT_CONNECTION(pSocket->XprtConn, XprtConn))
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{
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if (! fNoAddRef)
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{
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pSocket->AddRef();
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}
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break;
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}
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}
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::LeaveCriticalSection(&g_csTransport);
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return pSocket;
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}
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PSocket CSocketList::RemoveByTransportConnection(TransportConnection XprtConn)
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{
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PSocket pSocket;
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::EnterCriticalSection(&g_csTransport);
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Reset();
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while (NULL != (pSocket = Iterate()))
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{
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if (IS_SAME_TRANSPORT_CONNECTION(pSocket->XprtConn, XprtConn))
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{
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Remove(pSocket);
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break;
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}
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}
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::LeaveCriticalSection(&g_csTransport);
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return pSocket;
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}
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