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|
/*
* tclWinSock.c --
*
* This file contains Windows-specific socket related code.
*
* Copyright (c) 1995-1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tclWinSock.c,v 1.1.2.4 1998/12/12 01:37:06 lfb Exp $
*/
#include "tclWinInt.h"
/*
* The following variable is used to tell whether this module has been
* initialized.
*/
static int initialized = 0;
static int hostnameInitialized = 0;
static char hostname[255]; /* This buffer should be big enough for
* hostname plus domain name. */
TCL_DECLARE_MUTEX(socketMutex)
/*
* The following structure contains pointers to all of the WinSock API entry
* points used by Tcl. It is initialized by InitSockets. Since we
* dynamically load Winsock.dll on demand, we must use this function table
* to refer to functions in the socket API.
*/
static struct {
HINSTANCE hInstance; /* Handle to WinSock library. */
HWND hwnd; /* Handle to window for socket messages. */
SOCKET (PASCAL FAR *accept)(SOCKET s, struct sockaddr FAR *addr,
int FAR *addrlen);
int (PASCAL FAR *bind)(SOCKET s, const struct sockaddr FAR *addr,
int namelen);
int (PASCAL FAR *closesocket)(SOCKET s);
int (PASCAL FAR *connect)(SOCKET s, const struct sockaddr FAR *name,
int namelen);
int (PASCAL FAR *ioctlsocket)(SOCKET s, long cmd, u_long FAR *argp);
int (PASCAL FAR *getsockopt)(SOCKET s, int level, int optname,
char FAR * optval, int FAR *optlen);
u_short (PASCAL FAR *htons)(u_short hostshort);
unsigned long (PASCAL FAR *inet_addr)(const char FAR * cp);
char FAR * (PASCAL FAR *inet_ntoa)(struct in_addr in);
int (PASCAL FAR *listen)(SOCKET s, int backlog);
u_short (PASCAL FAR *ntohs)(u_short netshort);
int (PASCAL FAR *recv)(SOCKET s, char FAR * buf, int len, int flags);
int (PASCAL FAR *select)(int nfds, fd_set FAR * readfds,
fd_set FAR * writefds, fd_set FAR * exceptfds,
const struct timeval FAR * tiemout);
int (PASCAL FAR *send)(SOCKET s, const char FAR * buf, int len, int flags);
int (PASCAL FAR *setsockopt)(SOCKET s, int level, int optname,
const char FAR * optval, int optlen);
int (PASCAL FAR *shutdown)(SOCKET s, int how);
SOCKET (PASCAL FAR *socket)(int af, int type, int protocol);
struct hostent FAR * (PASCAL FAR *gethostbyname)(const char FAR * name);
struct hostent FAR * (PASCAL FAR *gethostbyaddr)(const char FAR *addr,
int addrlen, int addrtype);
int (PASCAL FAR *gethostname)(char FAR * name, int namelen);
int (PASCAL FAR *getpeername)(SOCKET sock, struct sockaddr FAR *name,
int FAR *namelen);
struct servent FAR * (PASCAL FAR *getservbyname)(const char FAR * name,
const char FAR * proto);
int (PASCAL FAR *getsockname)(SOCKET sock, struct sockaddr FAR *name,
int FAR *namelen);
int (PASCAL FAR *WSAStartup)(WORD wVersionRequired, LPWSADATA lpWSAData);
int (PASCAL FAR *WSACleanup)(void);
int (PASCAL FAR *WSAGetLastError)(void);
int (PASCAL FAR *WSAAsyncSelect)(SOCKET s, HWND hWnd, u_int wMsg,
long lEvent);
} winSock;
/*
* The following defines declare the messages used on socket windows.
*/
#define SOCKET_MESSAGE WM_USER+1
/*
* The following structure is used to store the data associated with
* each socket.
*/
typedef struct SocketInfo {
Tcl_Channel channel; /* Channel associated with this socket. */
SOCKET socket; /* Windows SOCKET handle. */
int flags; /* Bit field comprised of the flags
* described below. */
int watchEvents; /* OR'ed combination of FD_READ, FD_WRITE,
* FD_CLOSE, FD_ACCEPT and FD_CONNECT that
* indicate which events are interesting. */
int readyEvents; /* OR'ed combination of FD_READ, FD_WRITE,
* FD_CLOSE, FD_ACCEPT and FD_CONNECT that
* indicate which events have occurred. */
int selectEvents; /* OR'ed combination of FD_READ, FD_WRITE,
* FD_CLOSE, FD_ACCEPT and FD_CONNECT that
* indicate which events are currently
* being selected. */
Tcl_TcpAcceptProc *acceptProc; /* Proc to call on accept. */
ClientData acceptProcData; /* The data for the accept proc. */
int lastError; /* Error code from last message. */
struct SocketInfo *nextPtr; /* The next socket on the global socket
* list. */
} SocketInfo;
/*
* The following structure is what is added to the Tcl event queue when
* a socket event occurs.
*/
typedef struct SocketEvent {
Tcl_Event header; /* Information that is standard for
* all events. */
SOCKET socket; /* Socket descriptor that is ready. Used
* to find the SocketInfo structure for
* the file (can't point directly to the
* SocketInfo structure because it could
* go away while the event is queued). */
} SocketEvent;
/*
* This defines the minimum buffersize maintained by the kernel.
*/
#define TCP_BUFFER_SIZE 4096
/*
* The following macros may be used to set the flags field of
* a SocketInfo structure.
*/
#define SOCKET_ASYNC (1<<0) /* The socket is in blocking mode. */
#define SOCKET_EOF (1<<1) /* A zero read happened on
* the socket. */
#define SOCKET_ASYNC_CONNECT (1<<2) /* This socket uses async connect. */
#define SOCKET_PENDING (1<<3) /* A message has been sent
* for this socket */
typedef struct ThreadSpecificData {
/*
* Every open socket has an entry on the following list.
*/
SocketInfo *socketList;
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;
/*
* Static functions defined in this file.
*/
static SocketInfo * CreateSocket _ANSI_ARGS_((Tcl_Interp *interp,
int port, char *host, int server, char *myaddr,
int myport, int async));
static int CreateSocketAddress _ANSI_ARGS_(
(struct sockaddr_in *sockaddrPtr,
char *host, int port));
static void InitSockets _ANSI_ARGS_((void));
static SocketInfo * NewSocketInfo _ANSI_ARGS_((SOCKET socket));
static void SocketCheckProc _ANSI_ARGS_((ClientData clientData,
int flags));
static int SocketEventProc _ANSI_ARGS_((Tcl_Event *evPtr,
int flags));
static void SocketExitHandler _ANSI_ARGS_((ClientData clientData));
static LRESULT CALLBACK SocketProc _ANSI_ARGS_((HWND hwnd, UINT message,
WPARAM wParam, LPARAM lParam));
static void SocketSetupProc _ANSI_ARGS_((ClientData clientData,
int flags));
static void SocketThreadExitHandler _ANSI_ARGS_((ClientData clientData));
static int SocketsEnabled _ANSI_ARGS_((void));
static void TcpAccept _ANSI_ARGS_((SocketInfo *infoPtr));
static int TcpBlockProc _ANSI_ARGS_((ClientData instanceData,
int mode));
static int TcpCloseProc _ANSI_ARGS_((ClientData instanceData,
Tcl_Interp *interp));
static int TcpGetOptionProc _ANSI_ARGS_((ClientData instanceData,
Tcl_Interp *interp, char *optionName,
Tcl_DString *optionValue));
static int TcpInputProc _ANSI_ARGS_((ClientData instanceData,
char *buf, int toRead, int *errorCode));
static int TcpOutputProc _ANSI_ARGS_((ClientData instanceData,
char *buf, int toWrite, int *errorCode));
static void TcpWatchProc _ANSI_ARGS_((ClientData instanceData,
int mask));
static int TcpGetHandleProc _ANSI_ARGS_((ClientData instanceData,
int direction, ClientData *handlePtr));
static int WaitForSocketEvent _ANSI_ARGS_((SocketInfo *infoPtr,
int events, int *errorCodePtr));
/*
* This structure describes the channel type structure for TCP socket
* based IO.
*/
static Tcl_ChannelType tcpChannelType = {
"tcp", /* Type name. */
TcpBlockProc, /* Set socket into blocking/non-blocking mode. */
TcpCloseProc, /* Close proc. */
TcpInputProc, /* Input proc. */
TcpOutputProc, /* Output proc. */
NULL, /* Seek proc. */
NULL, /* Set option proc. */
TcpGetOptionProc, /* Get option proc. */
TcpWatchProc, /* Initialize notifier to watch this channel. */
TcpGetHandleProc, /* Get an OS handle from channel. */
};
/*
* Define version of Winsock required by Tcl.
*/
#define WSA_VERSION_REQD MAKEWORD(1,1)
/*
*----------------------------------------------------------------------
*
* InitSockets --
*
* Initialize the socket module. Attempts to load the wsock32.dll
* library and set up the winSock function table. If successful,
* registers the event window for the socket notifier code.
*
* Assumes Mutex is held.
*
* Results:
* None.
*
* Side effects:
* Dynamically loads wsock32.dll, and registers a new window
* class and creates a window for use in asynchronous socket
* notification.
*
*----------------------------------------------------------------------
*/
static void
InitSockets()
{
WSADATA wsaData;
OSVERSIONINFO info;
WNDCLASSA class;
ThreadSpecificData *tsdPtr =
(ThreadSpecificData *)TclThreadDataKeyGet(&dataKey);
if (! initialized) {
initialized = 1;
Tcl_CreateExitHandler(SocketExitHandler, (ClientData) NULL);
/*
* Find out if we're running on Win32s.
*/
info.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
GetVersionEx(&info);
/*
* Check to see if Sockets are supported on this system. Since
* win32s panics if we call WSAStartup on a system that doesn't
* have winsock.dll, we need to look for it on the system first.
* If we find winsock, then load the library and initialize the
* stub table.
*/
if ((info.dwPlatformId != VER_PLATFORM_WIN32s)
|| (SearchPathA(NULL, "WINSOCK", ".DLL", 0, NULL, NULL) != 0)) {
winSock.hInstance = LoadLibraryA("wsock32.dll");
} else {
winSock.hInstance = NULL;
}
/*
* Initialize the function table.
*/
if (!SocketsEnabled()) {
return;
}
winSock.accept = (SOCKET (PASCAL FAR *)(SOCKET s,
struct sockaddr FAR *addr, int FAR *addrlen))
GetProcAddress(winSock.hInstance, "accept");
winSock.bind = (int (PASCAL FAR *)(SOCKET s,
const struct sockaddr FAR *addr, int namelen))
GetProcAddress(winSock.hInstance, "bind");
winSock.closesocket = (int (PASCAL FAR *)(SOCKET s))
GetProcAddress(winSock.hInstance, "closesocket");
winSock.connect = (int (PASCAL FAR *)(SOCKET s,
const struct sockaddr FAR *name, int namelen))
GetProcAddress(winSock.hInstance, "connect");
winSock.ioctlsocket = (int (PASCAL FAR *)(SOCKET s, long cmd,
u_long FAR *argp))
GetProcAddress(winSock.hInstance, "ioctlsocket");
winSock.getsockopt = (int (PASCAL FAR *)(SOCKET s,
int level, int optname, char FAR * optval, int FAR *optlen))
GetProcAddress(winSock.hInstance, "getsockopt");
winSock.htons = (u_short (PASCAL FAR *)(u_short hostshort))
GetProcAddress(winSock.hInstance, "htons");
winSock.inet_addr = (unsigned long (PASCAL FAR *)(const char FAR *cp))
GetProcAddress(winSock.hInstance, "inet_addr");
winSock.inet_ntoa = (char FAR * (PASCAL FAR *)(struct in_addr in))
GetProcAddress(winSock.hInstance, "inet_ntoa");
winSock.listen = (int (PASCAL FAR *)(SOCKET s, int backlog))
GetProcAddress(winSock.hInstance, "listen");
winSock.ntohs = (u_short (PASCAL FAR *)(u_short netshort))
GetProcAddress(winSock.hInstance, "ntohs");
winSock.recv = (int (PASCAL FAR *)(SOCKET s, char FAR * buf,
int len, int flags)) GetProcAddress(winSock.hInstance, "recv");
winSock.select = (int (PASCAL FAR *)(int nfds, fd_set FAR * readfds,
fd_set FAR * writefds, fd_set FAR * exceptfds,
const struct timeval FAR * tiemout))
GetProcAddress(winSock.hInstance, "select");
winSock.send = (int (PASCAL FAR *)(SOCKET s, const char FAR * buf,
int len, int flags)) GetProcAddress(winSock.hInstance, "send");
winSock.setsockopt = (int (PASCAL FAR *)(SOCKET s, int level,
int optname, const char FAR * optval, int optlen))
GetProcAddress(winSock.hInstance, "setsockopt");
winSock.shutdown = (int (PASCAL FAR *)(SOCKET s, int how))
GetProcAddress(winSock.hInstance, "shutdown");
winSock.socket = (SOCKET (PASCAL FAR *)(int af, int type,
int protocol)) GetProcAddress(winSock.hInstance, "socket");
winSock.gethostbyaddr = (struct hostent FAR * (PASCAL FAR *)
(const char FAR *addr, int addrlen, int addrtype))
GetProcAddress(winSock.hInstance, "gethostbyaddr");
winSock.gethostbyname = (struct hostent FAR * (PASCAL FAR *)
(const char FAR *name))
GetProcAddress(winSock.hInstance, "gethostbyname");
winSock.gethostname = (int (PASCAL FAR *)(char FAR * name,
int namelen)) GetProcAddress(winSock.hInstance, "gethostname");
winSock.getpeername = (int (PASCAL FAR *)(SOCKET sock,
struct sockaddr FAR *name, int FAR *namelen))
GetProcAddress(winSock.hInstance, "getpeername");
winSock.getservbyname = (struct servent FAR * (PASCAL FAR *)
(const char FAR * name, const char FAR * proto))
GetProcAddress(winSock.hInstance, "getservbyname");
winSock.getsockname = (int (PASCAL FAR *)(SOCKET sock,
struct sockaddr FAR *name, int FAR *namelen))
GetProcAddress(winSock.hInstance, "getsockname");
winSock.WSAStartup = (int (PASCAL FAR *)(WORD wVersionRequired,
LPWSADATA lpWSAData)) GetProcAddress(winSock.hInstance, "WSAStartup");
winSock.WSACleanup = (int (PASCAL FAR *)(void))
GetProcAddress(winSock.hInstance, "WSACleanup");
winSock.WSAGetLastError = (int (PASCAL FAR *)(void))
GetProcAddress(winSock.hInstance, "WSAGetLastError");
winSock.WSAAsyncSelect = (int (PASCAL FAR *)(SOCKET s, HWND hWnd,
u_int wMsg, long lEvent))
GetProcAddress(winSock.hInstance, "WSAAsyncSelect");
/*
* Now check that all fields are properly initialized. If not, return
* zero to indicate that we failed to initialize properly.
*/
if ((winSock.hInstance == NULL) ||
(winSock.accept == NULL) ||
(winSock.bind == NULL) ||
(winSock.closesocket == NULL) ||
(winSock.connect == NULL) ||
(winSock.ioctlsocket == NULL) ||
(winSock.getsockopt == NULL) ||
(winSock.htons == NULL) ||
(winSock.inet_addr == NULL) ||
(winSock.inet_ntoa == NULL) ||
(winSock.listen == NULL) ||
(winSock.ntohs == NULL) ||
(winSock.recv == NULL) ||
(winSock.select == NULL) ||
(winSock.send == NULL) ||
(winSock.setsockopt == NULL) ||
(winSock.socket == NULL) ||
(winSock.gethostbyname == NULL) ||
(winSock.gethostbyaddr == NULL) ||
(winSock.gethostname == NULL) ||
(winSock.getpeername == NULL) ||
(winSock.getservbyname == NULL) ||
(winSock.getsockname == NULL) ||
(winSock.WSAStartup == NULL) ||
(winSock.WSACleanup == NULL) ||
(winSock.WSAGetLastError == NULL) ||
(winSock.WSAAsyncSelect == NULL)) {
goto unloadLibrary;
}
/*
* Initialize the winsock library and check the version number.
*/
if ((*winSock.WSAStartup)(WSA_VERSION_REQD, &wsaData) != 0) {
goto unloadLibrary;
}
if (wsaData.wVersion != WSA_VERSION_REQD) {
(*winSock.WSACleanup)();
goto unloadLibrary;
}
/*
* Create the async notification window with a new class. We
* must create a new class to avoid a Windows 95 bug that causes
* us to get the wrong message number for socket events if the
* message window is a subclass of a static control.
*/
class.style = 0;
class.cbClsExtra = 0;
class.cbWndExtra = 0;
class.hInstance = TclWinGetTclInstance();
class.hbrBackground = NULL;
class.lpszMenuName = NULL;
class.lpszClassName = "TclSocket";
class.lpfnWndProc = SocketProc;
class.hIcon = NULL;
class.hCursor = NULL;
if (RegisterClassA(&class)) {
winSock.hwnd = CreateWindowA("TclSocket", "TclSocket",
WS_TILED, 0, 0, 0, 0, NULL, NULL, class.hInstance, NULL);
} else {
winSock.hwnd = NULL;
}
if (winSock.hwnd == NULL) {
TclWinConvertError(GetLastError());
(*winSock.WSACleanup)();
goto unloadLibrary;
}
}
/*
* Check for per-thread initialization.
*/
if (tsdPtr == NULL) {
tsdPtr = TCL_TSD_INIT(&dataKey);
tsdPtr->socketList = NULL;
Tcl_CreateEventSource(SocketSetupProc, SocketCheckProc, NULL);
Tcl_CreateThreadExitHandler(SocketThreadExitHandler, NULL);
}
return;
unloadLibrary:
FreeLibrary(winSock.hInstance);
winSock.hInstance = NULL;
return;
}
/*
*----------------------------------------------------------------------
*
* SocketsEnabled --
*
* Check that the WinSock DLL is loaded and ready.
*
* Results:
* 1 if it is.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
static int
SocketsEnabled()
{
int enabled;
Tcl_MutexLock(&socketMutex);
enabled = (winSock.hInstance != NULL);
Tcl_MutexUnlock(&socketMutex);
return enabled;
}
/*
*----------------------------------------------------------------------
*
* SocketExitHandler --
*
* Callback invoked during exit clean up to delete the socket
* communication window and to release the WinSock DLL.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
static void
SocketExitHandler(clientData)
ClientData clientData; /* Not used. */
{
Tcl_MutexLock(&socketMutex);
if (winSock.hInstance) {
DestroyWindow(winSock.hwnd);
UnregisterClassA("TclSocket", TclWinGetTclInstance());
(*winSock.WSACleanup)();
FreeLibrary(winSock.hInstance);
winSock.hInstance = NULL;
}
initialized = 0;
hostnameInitialized = 0;
Tcl_MutexUnlock(&socketMutex);
}
/*
*----------------------------------------------------------------------
*
* SocketThreadExitHandler --
*
* Callback invoked during thread clean up to delete the socket
* event source.
*
* Results:
* None.
*
* Side effects:
* Delete the event source.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
static void
SocketThreadExitHandler(clientData)
ClientData clientData; /* Not used. */
{
Tcl_DeleteEventSource(SocketSetupProc, SocketCheckProc, NULL);
}
/*
*----------------------------------------------------------------------
*
* TclpHasSockets --
*
* This function determines whether sockets are available on the
* current system and returns an error in interp if they are not.
* Note that interp may be NULL.
*
* Results:
* Returns TCL_OK if the system supports sockets, or TCL_ERROR with
* an error in interp.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TclpHasSockets(interp)
Tcl_Interp *interp;
{
Tcl_MutexLock(&socketMutex);
InitSockets();
Tcl_MutexUnlock(&socketMutex);
if (SocketsEnabled()) {
return TCL_OK;
}
if (interp != NULL) {
Tcl_AppendResult(interp, "sockets are not available on this system",
NULL);
}
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* SocketSetupProc --
*
* This procedure is invoked before Tcl_DoOneEvent blocks waiting
* for an event.
*
* Results:
* None.
*
* Side effects:
* Adjusts the block time if needed.
*
*----------------------------------------------------------------------
*/
void
SocketSetupProc(data, flags)
ClientData data; /* Not used. */
int flags; /* Event flags as passed to Tcl_DoOneEvent. */
{
SocketInfo *infoPtr;
Tcl_Time blockTime = { 0, 0 };
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
if (!(flags & TCL_FILE_EVENTS)) {
return;
}
/*
* Check to see if there is a ready socket. If so, poll.
*/
for (infoPtr = tsdPtr->socketList; infoPtr != NULL;
infoPtr = infoPtr->nextPtr) {
if (infoPtr->readyEvents & infoPtr->watchEvents) {
Tcl_SetMaxBlockTime(&blockTime);
break;
}
}
}
/*
*----------------------------------------------------------------------
*
* SocketCheckProc --
*
* This procedure is called by Tcl_DoOneEvent to check the socket
* event source for events.
*
* Results:
* None.
*
* Side effects:
* May queue an event.
*
*----------------------------------------------------------------------
*/
static void
SocketCheckProc(data, flags)
ClientData data; /* Not used. */
int flags; /* Event flags as passed to Tcl_DoOneEvent. */
{
SocketInfo *infoPtr;
SocketEvent *evPtr;
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
if (!(flags & TCL_FILE_EVENTS)) {
return;
}
/*
* Queue events for any ready sockets that don't already have events
* queued (caused by persistent states that won't generate WinSock
* events).
*/
for (infoPtr = tsdPtr->socketList; infoPtr != NULL;
infoPtr = infoPtr->nextPtr) {
if ((infoPtr->readyEvents & infoPtr->watchEvents)
&& !(infoPtr->flags & SOCKET_PENDING)) {
infoPtr->flags |= SOCKET_PENDING;
evPtr = (SocketEvent *) ckalloc(sizeof(SocketEvent));
evPtr->header.proc = SocketEventProc;
evPtr->socket = infoPtr->socket;
Tcl_QueueEvent((Tcl_Event *) evPtr, TCL_QUEUE_TAIL);
}
}
}
/*
*----------------------------------------------------------------------
*
* SocketEventProc --
*
* This procedure is called by Tcl_ServiceEvent when a socket event
* reaches the front of the event queue. This procedure is
* responsible for notifying the generic channel code.
*
* Results:
* Returns 1 if the event was handled, meaning it should be removed
* from the queue. Returns 0 if the event was not handled, meaning
* it should stay on the queue. The only time the event isn't
* handled is if the TCL_FILE_EVENTS flag bit isn't set.
*
* Side effects:
* Whatever the channel callback procedures do.
*
*----------------------------------------------------------------------
*/
static int
SocketEventProc(evPtr, flags)
Tcl_Event *evPtr; /* Event to service. */
int flags; /* Flags that indicate what events to
* handle, such as TCL_FILE_EVENTS. */
{
SocketInfo *infoPtr;
SocketEvent *eventPtr = (SocketEvent *) evPtr;
int mask = 0;
int events;
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
if (!(flags & TCL_FILE_EVENTS)) {
return 0;
}
/*
* Find the specified socket on the socket list.
*/
for (infoPtr = tsdPtr->socketList; infoPtr != NULL;
infoPtr = infoPtr->nextPtr) {
if (infoPtr->socket == eventPtr->socket) {
break;
}
}
/*
* Discard events that have gone stale.
*/
if (!infoPtr) {
return 1;
}
infoPtr->flags &= ~SOCKET_PENDING;
/*
* Handle connection requests directly.
*/
if (infoPtr->readyEvents & FD_ACCEPT) {
TcpAccept(infoPtr);
return 1;
}
/*
* Mask off unwanted events and compute the read/write mask so
* we can notify the channel.
*/
events = infoPtr->readyEvents & infoPtr->watchEvents;
if (events & FD_CLOSE) {
/*
* If the socket was closed and the channel is still interested
* in read events, then we need to ensure that we keep polling
* for this event until someone does something with the channel.
* Note that we do this before calling Tcl_NotifyChannel so we don't
* have to watch out for the channel being deleted out from under
* us. This may cause a redundant trip through the event loop, but
* it's simpler than trying to do unwind protection.
*/
Tcl_Time blockTime = { 0, 0 };
Tcl_SetMaxBlockTime(&blockTime);
mask |= TCL_READABLE;
} else if (events & FD_READ) {
fd_set readFds;
struct timeval timeout;
/*
* We must check to see if data is really available, since someone
* could have consumed the data in the meantime. Turn off async
* notification so select will work correctly. If the socket is
* still readable, notify the channel driver, otherwise reset the
* async select handler and keep waiting.
*/
(void) (*winSock.WSAAsyncSelect)(infoPtr->socket, winSock.hwnd, 0, 0);
FD_ZERO(&readFds);
FD_SET(infoPtr->socket, &readFds);
timeout.tv_usec = 0;
timeout.tv_sec = 0;
if ((*winSock.select)(0, &readFds, NULL, NULL, &timeout) != 0) {
mask |= TCL_READABLE;
} else {
(void) (*winSock.WSAAsyncSelect)(infoPtr->socket, winSock.hwnd,
SOCKET_MESSAGE, infoPtr->selectEvents);
infoPtr->readyEvents &= ~(FD_READ);
}
}
if (events & FD_WRITE) {
mask |= TCL_WRITABLE;
}
if (mask) {
Tcl_NotifyChannel(infoPtr->channel, mask);
}
return 1;
}
/*
*----------------------------------------------------------------------
*
* TcpBlockProc --
*
* Sets a socket into blocking or non-blocking mode.
*
* Results:
* 0 if successful, errno if there was an error.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
TcpBlockProc(instanceData, mode)
ClientData instanceData; /* The socket to block/un-block. */
int mode; /* TCL_MODE_BLOCKING or
* TCL_MODE_NONBLOCKING. */
{
SocketInfo *infoPtr = (SocketInfo *) instanceData;
if (mode == TCL_MODE_NONBLOCKING) {
infoPtr->flags |= SOCKET_ASYNC;
} else {
infoPtr->flags &= ~(SOCKET_ASYNC);
}
return 0;
}
/*
*----------------------------------------------------------------------
*
* TcpCloseProc --
*
* This procedure is called by the generic IO level to perform
* channel type specific cleanup on a socket based channel
* when the channel is closed.
*
* Results:
* 0 if successful, the value of errno if failed.
*
* Side effects:
* Closes the socket.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
static int
TcpCloseProc(instanceData, interp)
ClientData instanceData; /* The socket to close. */
Tcl_Interp *interp; /* Unused. */
{
SocketInfo *infoPtr = (SocketInfo *) instanceData;
SocketInfo **nextPtrPtr;
int errorCode = 0;
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
/*
* Check that WinSock is initialized; do not call it if not, to
* prevent system crashes. This can happen at exit time if the exit
* handler for WinSock ran before other exit handlers that want to
* use sockets.
*/
if (SocketsEnabled()) {
/*
* Clean up the OS socket handle. The default Windows setting
* for a socket is SO_DONTLINGER, which does a graceful shutdown
* in the background.
*/
if ((*winSock.closesocket)(infoPtr->socket) == SOCKET_ERROR) {
TclWinConvertWSAError((*winSock.WSAGetLastError)());
errorCode = Tcl_GetErrno();
}
}
/*
* Remove the socket from socketList.
*/
for (nextPtrPtr = &(tsdPtr->socketList); (*nextPtrPtr) != NULL;
nextPtrPtr = &((*nextPtrPtr)->nextPtr)) {
if ((*nextPtrPtr) == infoPtr) {
(*nextPtrPtr) = infoPtr->nextPtr;
break;
}
}
ckfree((char *) infoPtr);
return errorCode;
}
/*
*----------------------------------------------------------------------
*
* NewSocketInfo --
*
* This function allocates and initializes a new SocketInfo
* structure.
*
* Results:
* Returns a newly allocated SocketInfo.
*
* Side effects:
* Adds the socket to the global socket list.
*
*----------------------------------------------------------------------
*/
static SocketInfo *
NewSocketInfo(socket)
SOCKET socket;
{
SocketInfo *infoPtr;
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
infoPtr = (SocketInfo *) ckalloc((unsigned) sizeof(SocketInfo));
infoPtr->socket = socket;
infoPtr->flags = 0;
infoPtr->watchEvents = 0;
infoPtr->readyEvents = 0;
infoPtr->selectEvents = 0;
infoPtr->acceptProc = NULL;
infoPtr->lastError = 0;
infoPtr->nextPtr = tsdPtr->socketList;
tsdPtr->socketList = infoPtr;
return infoPtr;
}
/*
*----------------------------------------------------------------------
*
* CreateSocket --
*
* This function opens a new socket and initializes the
* SocketInfo structure.
*
* Results:
* Returns a new SocketInfo, or NULL with an error in interp.
*
* Side effects:
* Adds a new socket to the socketList.
*
*----------------------------------------------------------------------
*/
static SocketInfo *
CreateSocket(interp, port, host, server, myaddr, myport, async)
Tcl_Interp *interp; /* For error reporting; can be NULL. */
int port; /* Port number to open. */
char *host; /* Name of host on which to open port. */
int server; /* 1 if socket should be a server socket,
* else 0 for a client socket. */
char *myaddr; /* Optional client-side address */
int myport; /* Optional client-side port */
int async; /* If nonzero, connect client socket
* asynchronously. */
{
u_long flag = 1; /* Indicates nonblocking mode. */
int asyncConnect = 0; /* Will be 1 if async connect is
* in progress. */
struct sockaddr_in sockaddr; /* Socket address */
struct sockaddr_in mysockaddr; /* Socket address for client */
SOCKET sock;
SocketInfo *infoPtr; /* The returned value. */
/*
* Check that WinSock is initialized; do not call it if not, to
* prevent system crashes. This can happen at exit time if the exit
* handler for WinSock ran before other exit handlers that want to
* use sockets.
*/
if (!SocketsEnabled()) {
return NULL;
}
if (! CreateSocketAddress(&sockaddr, host, port)) {
goto error;
}
if ((myaddr != NULL || myport != 0) &&
! CreateSocketAddress(&mysockaddr, myaddr, myport)) {
goto error;
}
sock = (*winSock.socket)(AF_INET, SOCK_STREAM, 0);
if (sock == INVALID_SOCKET) {
goto error;
}
/*
* Win-NT has a misfeature that sockets are inherited in child
* processes by default. Turn off the inherit bit.
*/
SetHandleInformation( (HANDLE) sock, HANDLE_FLAG_INHERIT, 0 );
/*
* Set kernel space buffering
*/
TclSockMinimumBuffers(sock, TCP_BUFFER_SIZE);
if (server) {
/*
* Bind to the specified port. Note that we must not call setsockopt
* with SO_REUSEADDR because Microsoft allows addresses to be reused
* even if they are still in use.
*
* Bind should not be affected by the socket having already been
* set into nonblocking mode. If there is trouble, this is one place
* to look for bugs.
*/
if ((*winSock.bind)(sock, (struct sockaddr *) &sockaddr,
sizeof(sockaddr)) == SOCKET_ERROR) {
goto error;
}
/*
* Set the maximum number of pending connect requests to the
* max value allowed on each platform (Win32 and Win32s may be
* different, and there may be differences between TCP/IP stacks).
*/
if ((*winSock.listen)(sock, SOMAXCONN) == SOCKET_ERROR) {
goto error;
}
/*
* Add this socket to the global list of sockets.
*/
infoPtr = NewSocketInfo(sock);
/*
* Set up the select mask for connection request events.
*/
infoPtr->selectEvents = FD_ACCEPT;
infoPtr->watchEvents |= FD_ACCEPT;
} else {
/*
* Try to bind to a local port, if specified.
*/
if (myaddr != NULL || myport != 0) {
if ((*winSock.bind)(sock, (struct sockaddr *) &mysockaddr,
sizeof(struct sockaddr)) == SOCKET_ERROR) {
goto error;
}
}
/*
* Set the socket into nonblocking mode if the connect should be
* done in the background.
*/
if (async) {
if ((*winSock.ioctlsocket)(sock, FIONBIO, &flag) == SOCKET_ERROR) {
goto error;
}
}
/*
* Attempt to connect to the remote socket.
*/
if ((*winSock.connect)(sock, (struct sockaddr *) &sockaddr,
sizeof(sockaddr)) == SOCKET_ERROR) {
TclWinConvertWSAError((*winSock.WSAGetLastError)());
if (Tcl_GetErrno() != EWOULDBLOCK) {
goto error;
}
/*
* The connection is progressing in the background.
*/
asyncConnect = 1;
}
/*
* Add this socket to the global list of sockets.
*/
infoPtr = NewSocketInfo(sock);
/*
* Set up the select mask for read/write events. If the connect
* attempt has not completed, include connect events.
*/
infoPtr->selectEvents = FD_READ | FD_WRITE | FD_CLOSE;
if (asyncConnect) {
infoPtr->flags |= SOCKET_ASYNC_CONNECT;
infoPtr->selectEvents |= FD_CONNECT;
}
}
/*
* Register for interest in events in the select mask. Note that this
* automatically places the socket into non-blocking mode.
*/
(*winSock.ioctlsocket)(sock, FIONBIO, &flag);
(void) (*winSock.WSAAsyncSelect)(infoPtr->socket, winSock.hwnd,
SOCKET_MESSAGE, infoPtr->selectEvents);
return infoPtr;
error:
TclWinConvertWSAError((*winSock.WSAGetLastError)());
if (interp != NULL) {
Tcl_AppendResult(interp, "couldn't open socket: ",
Tcl_PosixError(interp), (char *) NULL);
}
if (sock != INVALID_SOCKET) {
(*winSock.closesocket)(sock);
}
return NULL;
}
/*
*----------------------------------------------------------------------
*
* CreateSocketAddress --
*
* This function initializes a sockaddr structure for a host and port.
*
* Results:
* 1 if the host was valid, 0 if the host could not be converted to
* an IP address.
*
* Side effects:
* Fills in the *sockaddrPtr structure.
*
*----------------------------------------------------------------------
*/
static int
CreateSocketAddress(sockaddrPtr, host, port)
struct sockaddr_in *sockaddrPtr; /* Socket address */
char *host; /* Host. NULL implies INADDR_ANY */
int port; /* Port number */
{
struct hostent *hostent; /* Host database entry */
struct in_addr addr; /* For 64/32 bit madness */
/*
* Check that WinSock is initialized; do not call it if not, to
* prevent system crashes. This can happen at exit time if the exit
* handler for WinSock ran before other exit handlers that want to
* use sockets.
*/
if (!SocketsEnabled()) {
Tcl_SetErrno(EFAULT);
return 0;
}
(void) memset((char *) sockaddrPtr, '\0', sizeof(struct sockaddr_in));
sockaddrPtr->sin_family = AF_INET;
sockaddrPtr->sin_port = (*winSock.htons)((short) (port & 0xFFFF));
if (host == NULL) {
addr.s_addr = INADDR_ANY;
} else {
addr.s_addr = (*winSock.inet_addr)(host);
if (addr.s_addr == INADDR_NONE) {
hostent = (*winSock.gethostbyname)(host);
if (hostent != NULL) {
memcpy((char *) &addr,
(char *) hostent->h_addr_list[0],
(size_t) hostent->h_length);
} else {
#ifdef EHOSTUNREACH
Tcl_SetErrno(EHOSTUNREACH);
#else
#ifdef ENXIO
Tcl_SetErrno(ENXIO);
#endif
#endif
return 0; /* Error. */
}
}
}
/*
* NOTE: On 64 bit machines the assignment below is rumored to not
* do the right thing. Please report errors related to this if you
* observe incorrect behavior on 64 bit machines such as DEC Alphas.
* Should we modify this code to do an explicit memcpy?
*/
sockaddrPtr->sin_addr.s_addr = addr.s_addr;
return 1; /* Success. */
}
/*
*----------------------------------------------------------------------
*
* WaitForSocketEvent --
*
* Waits until one of the specified events occurs on a socket.
*
* Results:
* Returns 1 on success or 0 on failure, with an error code in
* errorCodePtr.
*
* Side effects:
* Processes socket events off the system queue.
*
*----------------------------------------------------------------------
*/
static int
WaitForSocketEvent(infoPtr, events, errorCodePtr)
SocketInfo *infoPtr; /* Information about this socket. */
int events; /* Events to look for. */
int *errorCodePtr; /* Where to store errors? */
{
MSG msg;
int result = 1;
int oldMode;
/*
* Be sure to disable event servicing so we are truly modal.
*/
oldMode = Tcl_SetServiceMode(TCL_SERVICE_NONE);
/*
* Reset WSAAsyncSelect so we have a fresh set of events pending.
*/
(void) (*winSock.WSAAsyncSelect)(infoPtr->socket, winSock.hwnd, 0, 0);
(void) (*winSock.WSAAsyncSelect)(infoPtr->socket, winSock.hwnd,
SOCKET_MESSAGE, infoPtr->selectEvents);
while (1) {
/*
* Process all outstanding messages on the socket window.
*/
while (PeekMessage(&msg, winSock.hwnd, 0, 0, PM_REMOVE)) {
DispatchMessage(&msg);
}
if (infoPtr->lastError) {
*errorCodePtr = infoPtr->lastError;
result = 0;
break;
} else if (infoPtr->readyEvents & events) {
break;
} else if (infoPtr->flags & SOCKET_ASYNC) {
*errorCodePtr = EWOULDBLOCK;
result = 0;
break;
}
/*
* Wait until something happens.
*/
WaitMessage();
}
(void) Tcl_SetServiceMode(oldMode);
return result;
}
/*
*----------------------------------------------------------------------
*
* Tcl_OpenTcpClient --
*
* Opens a TCP client socket and creates a channel around it.
*
* Results:
* The channel or NULL if failed. An error message is returned
* in the interpreter on failure.
*
* Side effects:
* Opens a client socket and creates a new channel.
*
*----------------------------------------------------------------------
*/
Tcl_Channel
Tcl_OpenTcpClient(interp, port, host, myaddr, myport, async)
Tcl_Interp *interp; /* For error reporting; can be NULL. */
int port; /* Port number to open. */
char *host; /* Host on which to open port. */
char *myaddr; /* Client-side address */
int myport; /* Client-side port */
int async; /* If nonzero, should connect
* client socket asynchronously. */
{
SocketInfo *infoPtr;
char channelName[16 + TCL_INTEGER_SPACE];
if (TclpHasSockets(interp) != TCL_OK) {
return NULL;
}
/*
* Create a new client socket and wrap it in a channel.
*/
infoPtr = CreateSocket(interp, port, host, 0, myaddr, myport, async);
if (infoPtr == NULL) {
return NULL;
}
wsprintfA(channelName, "sock%d", infoPtr->socket);
infoPtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
(ClientData) infoPtr, (TCL_READABLE | TCL_WRITABLE));
if (Tcl_SetChannelOption(interp, infoPtr->channel, "-translation",
"auto crlf") == TCL_ERROR) {
Tcl_Close((Tcl_Interp *) NULL, infoPtr->channel);
return (Tcl_Channel) NULL;
}
if (Tcl_SetChannelOption(NULL, infoPtr->channel, "-eofchar", "")
== TCL_ERROR) {
Tcl_Close((Tcl_Interp *) NULL, infoPtr->channel);
return (Tcl_Channel) NULL;
}
return infoPtr->channel;
}
/*
*----------------------------------------------------------------------
*
* Tcl_MakeTcpClientChannel --
*
* Creates a Tcl_Channel from an existing client TCP socket.
*
* Results:
* The Tcl_Channel wrapped around the preexisting TCP socket.
*
* Side effects:
* None.
*
* NOTE: Code contributed by Mark Diekhans (markd@grizzly.com)
*
*----------------------------------------------------------------------
*/
Tcl_Channel
Tcl_MakeTcpClientChannel(sock)
ClientData sock; /* The socket to wrap up into a channel. */
{
SocketInfo *infoPtr;
char channelName[16 + TCL_INTEGER_SPACE];
if (TclpHasSockets(NULL) != TCL_OK) {
return NULL;
}
/*
* Set kernel space buffering and non-blocking.
*/
TclSockMinimumBuffers((SOCKET) sock, TCP_BUFFER_SIZE);
infoPtr = NewSocketInfo((SOCKET) sock);
/*
* Start watching for read/write events on the socket.
*/
infoPtr->selectEvents = FD_READ | FD_CLOSE | FD_WRITE;
(void) (*winSock.WSAAsyncSelect)(infoPtr->socket, winSock.hwnd,
SOCKET_MESSAGE, infoPtr->selectEvents);
wsprintfA(channelName, "sock%d", infoPtr->socket);
infoPtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
(ClientData) infoPtr, (TCL_READABLE | TCL_WRITABLE));
Tcl_SetChannelOption(NULL, infoPtr->channel, "-translation", "auto crlf");
return infoPtr->channel;
}
/*
*----------------------------------------------------------------------
*
* Tcl_OpenTcpServer --
*
* Opens a TCP server socket and creates a channel around it.
*
* Results:
* The channel or NULL if failed. An error message is returned
* in the interpreter on failure.
*
* Side effects:
* Opens a server socket and creates a new channel.
*
*----------------------------------------------------------------------
*/
Tcl_Channel
Tcl_OpenTcpServer(interp, port, host, acceptProc, acceptProcData)
Tcl_Interp *interp; /* For error reporting - may be
* NULL. */
int port; /* Port number to open. */
char *host; /* Name of local host. */
Tcl_TcpAcceptProc *acceptProc; /* Callback for accepting connections
* from new clients. */
ClientData acceptProcData; /* Data for the callback. */
{
SocketInfo *infoPtr;
char channelName[16 + TCL_INTEGER_SPACE];
if (TclpHasSockets(interp) != TCL_OK) {
return NULL;
}
/*
* Create a new client socket and wrap it in a channel.
*/
infoPtr = CreateSocket(interp, port, host, 1, NULL, 0, 0);
if (infoPtr == NULL) {
return NULL;
}
infoPtr->acceptProc = acceptProc;
infoPtr->acceptProcData = acceptProcData;
wsprintfA(channelName, "sock%d", infoPtr->socket);
infoPtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
(ClientData) infoPtr, 0);
if (Tcl_SetChannelOption(interp, infoPtr->channel, "-eofchar", "")
== TCL_ERROR) {
Tcl_Close((Tcl_Interp *) NULL, infoPtr->channel);
return (Tcl_Channel) NULL;
}
return infoPtr->channel;
}
/*
*----------------------------------------------------------------------
*
* TcpAccept --
* Accept a TCP socket connection. This is called by
* SocketEventProc and it in turns calls the registered accept
* procedure.
*
* Results:
* None.
*
* Side effects:
* Invokes the accept proc which may invoke arbitrary Tcl code.
*
*----------------------------------------------------------------------
*/
static void
TcpAccept(infoPtr)
SocketInfo *infoPtr; /* Socket to accept. */
{
SOCKET newSocket;
SocketInfo *newInfoPtr;
struct sockaddr_in addr;
int len;
char channelName[16 + TCL_INTEGER_SPACE];
/*
* Accept the incoming connection request.
*/
len = sizeof(struct sockaddr_in);
newSocket = (*winSock.accept)(infoPtr->socket, (struct sockaddr *)&addr,
&len);
/*
* Clear the ready mask so we can detect the next connection request.
* Note that connection requests are level triggered, so if there is
* a request already pending, a new event will be generated.
*/
infoPtr->readyEvents &= ~(FD_ACCEPT);
if (newSocket == INVALID_SOCKET) {
return;
}
/*
* Win-NT has a misfeature that sockets are inherited in child
* processes by default. Turn off the inherit bit.
*/
SetHandleInformation( (HANDLE) newSocket, HANDLE_FLAG_INHERIT, 0 );
/*
* Add this socket to the global list of sockets.
*/
newInfoPtr = NewSocketInfo(newSocket);
/*
* Select on read/write events and create the channel.
*/
newInfoPtr->selectEvents = (FD_READ | FD_WRITE | FD_CLOSE);
(void) (*winSock.WSAAsyncSelect)(newInfoPtr->socket, winSock.hwnd,
SOCKET_MESSAGE, newInfoPtr->selectEvents);
wsprintfA(channelName, "sock%d", newInfoPtr->socket);
newInfoPtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
(ClientData) newInfoPtr, (TCL_READABLE | TCL_WRITABLE));
if (Tcl_SetChannelOption(NULL, newInfoPtr->channel, "-translation",
"auto crlf") == TCL_ERROR) {
Tcl_Close((Tcl_Interp *) NULL, newInfoPtr->channel);
return;
}
if (Tcl_SetChannelOption(NULL, newInfoPtr->channel, "-eofchar", "")
== TCL_ERROR) {
Tcl_Close((Tcl_Interp *) NULL, newInfoPtr->channel);
return;
}
/*
* Invoke the accept callback procedure.
*/
if (infoPtr->acceptProc != NULL) {
(infoPtr->acceptProc) (infoPtr->acceptProcData, newInfoPtr->channel,
(*winSock.inet_ntoa)(addr.sin_addr),
(*winSock.ntohs)(addr.sin_port));
}
}
/*
*----------------------------------------------------------------------
*
* TcpInputProc --
*
* This procedure is called by the generic IO level to read data from
* a socket based channel.
*
* Results:
* The number of bytes read or -1 on error.
*
* Side effects:
* Consumes input from the socket.
*
*----------------------------------------------------------------------
*/
static int
TcpInputProc(instanceData, buf, toRead, errorCodePtr)
ClientData instanceData; /* The socket state. */
char *buf; /* Where to store data. */
int toRead; /* Maximum number of bytes to read. */
int *errorCodePtr; /* Where to store error codes. */
{
SocketInfo *infoPtr = (SocketInfo *) instanceData;
int bytesRead;
int error;
*errorCodePtr = 0;
/*
* Check that WinSock is initialized; do not call it if not, to
* prevent system crashes. This can happen at exit time if the exit
* handler for WinSock ran before other exit handlers that want to
* use sockets.
*/
if (!SocketsEnabled()) {
*errorCodePtr = EFAULT;
return -1;
}
/*
* First check to see if EOF was already detected, to prevent
* calling the socket stack after the first time EOF is detected.
*/
if (infoPtr->flags & SOCKET_EOF) {
return 0;
}
/*
* Check to see if the socket is connected before trying to read.
*/
if ((infoPtr->flags & SOCKET_ASYNC_CONNECT)
&& ! WaitForSocketEvent(infoPtr, FD_CONNECT, errorCodePtr)) {
return -1;
}
/*
* No EOF, and it is connected, so try to read more from the socket.
* Note that we clear the FD_READ bit because read events are level
* triggered so a new event will be generated if there is still data
* available to be read. We have to simulate blocking behavior here
* since we are always using non-blocking sockets.
*/
while (1) {
(void) (*winSock.WSAAsyncSelect)(infoPtr->socket, winSock.hwnd,
0, 0);
bytesRead = (*winSock.recv)(infoPtr->socket, buf, toRead, 0);
infoPtr->readyEvents &= ~(FD_READ);
/*
* Check for end-of-file condition or successful read.
*/
if (bytesRead == 0) {
infoPtr->flags |= SOCKET_EOF;
}
if (bytesRead != SOCKET_ERROR) {
break;
}
/*
* If an error occurs after the FD_CLOSE has arrived,
* then ignore the error and report an EOF.
*/
if (infoPtr->readyEvents & FD_CLOSE) {
infoPtr->flags |= SOCKET_EOF;
bytesRead = 0;
break;
}
/*
* Check for error condition or underflow in non-blocking case.
*/
error = (*winSock.WSAGetLastError)();
if ((infoPtr->flags & SOCKET_ASYNC) || (error != WSAEWOULDBLOCK)) {
TclWinConvertWSAError(error);
*errorCodePtr = Tcl_GetErrno();
bytesRead = -1;
break;
}
/*
* In the blocking case, wait until the file becomes readable
* or closed and try again.
*/
if (!WaitForSocketEvent(infoPtr, FD_READ|FD_CLOSE, errorCodePtr)) {
bytesRead = -1;
break;
}
}
(void) (*winSock.WSAAsyncSelect)(infoPtr->socket, winSock.hwnd,
SOCKET_MESSAGE, infoPtr->selectEvents);
return bytesRead;
}
/*
*----------------------------------------------------------------------
*
* TcpOutputProc --
*
* This procedure is called by the generic IO level to write data
* to a socket based channel.
*
* Results:
* The number of bytes written or -1 on failure.
*
* Side effects:
* Produces output on the socket.
*
*----------------------------------------------------------------------
*/
static int
TcpOutputProc(instanceData, buf, toWrite, errorCodePtr)
ClientData instanceData; /* The socket state. */
char *buf; /* Where to get data. */
int toWrite; /* Maximum number of bytes to write. */
int *errorCodePtr; /* Where to store error codes. */
{
SocketInfo *infoPtr = (SocketInfo *) instanceData;
int bytesWritten;
int error;
*errorCodePtr = 0;
/*
* Check that WinSock is initialized; do not call it if not, to
* prevent system crashes. This can happen at exit time if the exit
* handler for WinSock ran before other exit handlers that want to
* use sockets.
*/
if (! SocketsEnabled()) {
*errorCodePtr = EFAULT;
return -1;
}
/*
* Check to see if the socket is connected before trying to write.
*/
if ((infoPtr->flags & SOCKET_ASYNC_CONNECT)
&& ! WaitForSocketEvent(infoPtr, FD_CONNECT, errorCodePtr)) {
return -1;
}
while (1) {
(void) (*winSock.WSAAsyncSelect)(infoPtr->socket, winSock.hwnd,
0, 0);
bytesWritten = (*winSock.send)(infoPtr->socket, buf, toWrite, 0);
if (bytesWritten != SOCKET_ERROR) {
/*
* Since Windows won't generate a new write event until we hit
* an overflow condition, we need to force the event loop to
* poll until the condition changes.
*/
if (infoPtr->watchEvents & FD_WRITE) {
Tcl_Time blockTime = { 0, 0 };
Tcl_SetMaxBlockTime(&blockTime);
}
break;
}
/*
* Check for error condition or overflow. In the event of overflow, we
* need to clear the FD_WRITE flag so we can detect the next writable
* event. Note that Windows only sends a new writable event after a
* send fails with WSAEWOULDBLOCK.
*/
error = (*winSock.WSAGetLastError)();
if (error == WSAEWOULDBLOCK) {
infoPtr->readyEvents &= ~(FD_WRITE);
if (infoPtr->flags & SOCKET_ASYNC) {
*errorCodePtr = EWOULDBLOCK;
bytesWritten = -1;
break;
}
} else {
TclWinConvertWSAError(error);
*errorCodePtr = Tcl_GetErrno();
bytesWritten = -1;
break;
}
/*
* In the blocking case, wait until the file becomes writable
* or closed and try again.
*/
if (!WaitForSocketEvent(infoPtr, FD_WRITE|FD_CLOSE, errorCodePtr)) {
bytesWritten = -1;
break;
}
}
(void) (*winSock.WSAAsyncSelect)(infoPtr->socket, winSock.hwnd,
SOCKET_MESSAGE, infoPtr->selectEvents);
return bytesWritten;
}
/*
*----------------------------------------------------------------------
*
* TcpGetOptionProc --
*
* Computes an option value for a TCP socket based channel, or a
* list of all options and their values.
*
* Note: This code is based on code contributed by John Haxby.
*
* Results:
* A standard Tcl result. The value of the specified option or a
* list of all options and their values is returned in the
* supplied DString.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
TcpGetOptionProc(instanceData, interp, optionName, dsPtr)
ClientData instanceData; /* Socket state. */
Tcl_Interp *interp; /* For error reporting - can be NULL */
char *optionName; /* Name of the option to
* retrieve the value for, or
* NULL to get all options and
* their values. */
Tcl_DString *dsPtr; /* Where to store the computed
* value; initialized by caller. */
{
SocketInfo *infoPtr;
struct sockaddr_in sockname;
struct sockaddr_in peername;
struct hostent *hostEntPtr;
SOCKET sock;
int size = sizeof(struct sockaddr_in);
size_t len = 0;
char buf[TCL_INTEGER_SPACE];
/*
* Check that WinSock is initialized; do not call it if not, to
* prevent system crashes. This can happen at exit time if the exit
* handler for WinSock ran before other exit handlers that want to
* use sockets.
*/
if (!SocketsEnabled()) {
if (interp) {
Tcl_AppendResult(interp, "winsock is not initialized", NULL);
}
return TCL_ERROR;
}
infoPtr = (SocketInfo *) instanceData;
sock = (int) infoPtr->socket;
if (optionName != (char *) NULL) {
len = strlen(optionName);
}
if ((len == 0) ||
((len > 1) && (optionName[1] == 'p') &&
(strncmp(optionName, "-peername", len) == 0))) {
if ((*winSock.getpeername)(sock, (struct sockaddr *) &peername, &size)
== 0) {
if (len == 0) {
Tcl_DStringAppendElement(dsPtr, "-peername");
Tcl_DStringStartSublist(dsPtr);
}
Tcl_DStringAppendElement(dsPtr,
(*winSock.inet_ntoa)(peername.sin_addr));
hostEntPtr = (*winSock.gethostbyaddr)(
(char *) &(peername.sin_addr), sizeof(peername.sin_addr),
AF_INET);
if (hostEntPtr != (struct hostent *) NULL) {
Tcl_DStringAppendElement(dsPtr, hostEntPtr->h_name);
} else {
Tcl_DStringAppendElement(dsPtr,
(*winSock.inet_ntoa)(peername.sin_addr));
}
TclFormatInt(buf, (*winSock.ntohs)(peername.sin_port));
Tcl_DStringAppendElement(dsPtr, buf);
if (len == 0) {
Tcl_DStringEndSublist(dsPtr);
} else {
return TCL_OK;
}
} else {
/*
* getpeername failed - but if we were asked for all the options
* (len==0), don't flag an error at that point because it could
* be an fconfigure request on a server socket. (which have
* no peer). {copied from unix/tclUnixChan.c}
*/
if (len) {
TclWinConvertWSAError((*winSock.WSAGetLastError)());
if (interp) {
Tcl_AppendResult(interp, "can't get peername: ",
Tcl_PosixError(interp),
(char *) NULL);
}
return TCL_ERROR;
}
}
}
if ((len == 0) ||
((len > 1) && (optionName[1] == 's') &&
(strncmp(optionName, "-sockname", len) == 0))) {
if ((*winSock.getsockname)(sock, (struct sockaddr *) &sockname, &size)
== 0) {
if (len == 0) {
Tcl_DStringAppendElement(dsPtr, "-sockname");
Tcl_DStringStartSublist(dsPtr);
}
Tcl_DStringAppendElement(dsPtr,
(*winSock.inet_ntoa)(sockname.sin_addr));
hostEntPtr = (*winSock.gethostbyaddr)(
(char *) &(sockname.sin_addr), sizeof(peername.sin_addr),
AF_INET);
if (hostEntPtr != (struct hostent *) NULL) {
Tcl_DStringAppendElement(dsPtr, hostEntPtr->h_name);
} else {
Tcl_DStringAppendElement(dsPtr,
(*winSock.inet_ntoa)(sockname.sin_addr));
}
TclFormatInt(buf, (*winSock.ntohs)(sockname.sin_port));
Tcl_DStringAppendElement(dsPtr, buf);
if (len == 0) {
Tcl_DStringEndSublist(dsPtr);
} else {
return TCL_OK;
}
} else {
if (interp) {
TclWinConvertWSAError((*winSock.WSAGetLastError)());
Tcl_AppendResult(interp, "can't get sockname: ",
Tcl_PosixError(interp),
(char *) NULL);
}
return TCL_ERROR;
}
}
if (len > 0) {
return Tcl_BadChannelOption(interp, optionName, "peername sockname");
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* TcpWatchProc --
*
* Informs the channel driver of the events that the generic
* channel code wishes to receive on this socket.
*
* Results:
* None.
*
* Side effects:
* May cause the notifier to poll if any of the specified
* conditions are already true.
*
*----------------------------------------------------------------------
*/
static void
TcpWatchProc(instanceData, mask)
ClientData instanceData; /* The socket state. */
int mask; /* Events of interest; an OR-ed
* combination of TCL_READABLE,
* TCL_WRITABLE and TCL_EXCEPTION. */
{
SocketInfo *infoPtr = (SocketInfo *) instanceData;
/*
* Update the watch events mask.
*/
infoPtr->watchEvents = 0;
if (mask & TCL_READABLE) {
infoPtr->watchEvents |= (FD_READ|FD_CLOSE|FD_ACCEPT);
}
if (mask & TCL_WRITABLE) {
infoPtr->watchEvents |= (FD_WRITE);
}
/*
* If there are any conditions already set, then tell the notifier to poll
* rather than block.
*/
if (infoPtr->readyEvents & infoPtr->watchEvents) {
Tcl_Time blockTime = { 0, 0 };
Tcl_SetMaxBlockTime(&blockTime);
}
}
/*
*----------------------------------------------------------------------
*
* TcpGetProc --
*
* Called from Tcl_GetChannelFile to retrieve an OS handle from inside
* a TCP socket based channel.
*
* Results:
* Returns TCL_OK with the socket in handlePtr.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
TcpGetHandleProc(instanceData, direction, handlePtr)
ClientData instanceData; /* The socket state. */
int direction; /* Not used. */
ClientData *handlePtr; /* Where to store the handle. */
{
SocketInfo *statePtr = (SocketInfo *) instanceData;
*handlePtr = (ClientData) statePtr->socket;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* SocketProc --
*
* This function is called when WSAAsyncSelect has been used
* to register interest in a socket event, and the event has
* occurred.
*
* Results:
* 0 on success.
*
* Side effects:
* The flags for the given socket are updated to reflect the
* event that occured.
*
*----------------------------------------------------------------------
*/
static LRESULT CALLBACK
SocketProc(hwnd, message, wParam, lParam)
HWND hwnd;
UINT message;
WPARAM wParam;
LPARAM lParam;
{
int event, error;
SOCKET socket;
SocketInfo *infoPtr;
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
if (message != SOCKET_MESSAGE) {
return DefWindowProc(hwnd, message, wParam, lParam);
}
event = WSAGETSELECTEVENT(lParam);
error = WSAGETSELECTERROR(lParam);
socket = (SOCKET) wParam;
/*
* Find the specified socket on the socket list and update its
* eventState flag.
*/
for (infoPtr = tsdPtr->socketList; infoPtr != NULL;
infoPtr = infoPtr->nextPtr) {
if (infoPtr->socket == socket) {
/*
* Update the socket state.
*/
if (event & FD_CLOSE) {
infoPtr->readyEvents &= ~(FD_WRITE|FD_ACCEPT);
}
if (event & FD_CONNECT) {
/*
* The socket is now connected, so clear the async connect
* flag.
*/
infoPtr->flags &= ~(SOCKET_ASYNC_CONNECT);
/*
* Remember any error that occurred so we can report
* connection failures.
*/
if (error != ERROR_SUCCESS) {
TclWinConvertWSAError(error);
infoPtr->lastError = Tcl_GetErrno();
}
}
infoPtr->readyEvents |= event;
break;
}
}
/*
* Flush the Tcl event queue before returning to the event loop.
*/
Tcl_ServiceAll();
return 0;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetHostName --
*
* Returns the name of the local host.
*
* Results:
* A string containing the network name for this machine, or
* an empty string if we can't figure out the name. The caller
* must not modify or free this string.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
char *
Tcl_GetHostName()
{
DWORD length;
WCHAR wbuf[MAX_COMPUTERNAME_LENGTH + 1];
Tcl_MutexLock(&socketMutex);
if (hostnameInitialized) {
Tcl_MutexUnlock(&socketMutex);
return hostname;
}
if (TclpHasSockets(NULL) == TCL_OK) {
/*
* INTL: bug
*/
if ((*winSock.gethostname)(hostname, sizeof(hostname)) == 0) {
hostnameInitialized = 1;
Tcl_MutexUnlock(&socketMutex);
return hostname;
}
}
length = sizeof(hostname);
if ((*tclWinProcs->getComputerNameProc)(wbuf, &length) != 0) {
/*
* Convert string from native to UTF then change to lowercase.
*/
Tcl_DString ds;
lstrcpynA(hostname, Tcl_WinTCharToUtf((TCHAR *) wbuf, -1, &ds),
sizeof(hostname));
Tcl_DStringFree(&ds);
Tcl_UtfToLower(hostname);
} else {
hostname[0] = '\0';
}
hostnameInitialized = 1;
Tcl_MutexUnlock(&socketMutex);
return hostname;
}
/*
*----------------------------------------------------------------------
*
* TclWinGetSockOpt, et al. --
*
* These functions are wrappers that let us bind the WinSock
* API dynamically so we can run on systems that don't have
* the wsock32.dll. We need wrappers for these interfaces
* because they are called from the generic Tcl code.
*
* Results:
* As defined for each function.
*
* Side effects:
* As defined for each function.
*
*----------------------------------------------------------------------
*/
int PASCAL FAR
TclWinGetSockOpt(SOCKET s, int level, int optname, char FAR * optval,
int FAR *optlen)
{
/*
* Check that WinSock is initialized; do not call it if not, to
* prevent system crashes. This can happen at exit time if the exit
* handler for WinSock ran before other exit handlers that want to
* use sockets.
*/
if (!SocketsEnabled()) {
return SOCKET_ERROR;
}
return (*winSock.getsockopt)(s, level, optname, optval, optlen);
}
int PASCAL FAR
TclWinSetSockOpt(SOCKET s, int level, int optname, const char FAR * optval,
int optlen)
{
/*
* Check that WinSock is initialized; do not call it if not, to
* prevent system crashes. This can happen at exit time if the exit
* handler for WinSock ran before other exit handlers that want to
* use sockets.
*/
if (!SocketsEnabled()) {
return SOCKET_ERROR;
}
return (*winSock.setsockopt)(s, level, optname, optval, optlen);
}
u_short PASCAL FAR
TclWinNToHS(u_short netshort)
{
/*
* Check that WinSock is initialized; do not call it if not, to
* prevent system crashes. This can happen at exit time if the exit
* handler for WinSock ran before other exit handlers that want to
* use sockets.
*/
if (!SocketsEnabled()) {
return (u_short) -1;
}
return (*winSock.ntohs)(netshort);
}
struct servent FAR * PASCAL FAR
TclWinGetServByName(const char FAR * name, const char FAR * proto)
{
/*
* Check that WinSock is initialized; do not call it if not, to
* prevent system crashes. This can happen at exit time if the exit
* handler for WinSock ran before other exit handlers that want to
* use sockets.
*/
if (!SocketsEnabled()) {
return (struct servent FAR *) NULL;
}
return (*winSock.getservbyname)(name, proto);
}
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