diff options
Diffstat (limited to 'unix')
| -rw-r--r-- | unix/tclUnixChan.c | 1143 | ||||
| -rw-r--r-- | unix/tclUnixPort.h | 4 | ||||
| -rw-r--r-- | unix/tclUnixSock.c | 1152 |
3 files changed, 1157 insertions, 1142 deletions
diff --git a/unix/tclUnixChan.c b/unix/tclUnixChan.c index 29da9e4..d8eaccc 100644 --- a/unix/tclUnixChan.c +++ b/unix/tclUnixChan.c @@ -10,7 +10,7 @@ * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclUnixChan.c,v 1.100 2009/04/10 21:40:55 dgp Exp $ + * RCS: @(#) $Id: tclUnixChan.c,v 1.101 2009/06/15 16:24:45 rmax Exp $ */ #include "tclInt.h" /* Internal definitions for Tcl. */ @@ -144,60 +144,9 @@ typedef struct TtyAttrs { } /* - * This structure describes per-instance state of a tcp based channel. - */ - -typedef struct TcpState { - Tcl_Channel channel; /* Channel associated with this file. */ - int fd; /* The socket itself. */ - int flags; /* ORed combination of the bitfields defined - * below. */ - Tcl_TcpAcceptProc *acceptProc; - /* Proc to call on accept. */ - ClientData acceptProcData; /* The data for the accept proc. */ -} TcpState; - -/* - * These bits may be ORed together into the "flags" field of a TcpState - * structure. - */ - -#define TCP_ASYNC_SOCKET (1<<0) /* Asynchronous socket. */ -#define TCP_ASYNC_CONNECT (1<<1) /* Async connect in progress. */ - -/* - * The following defines the maximum length of the listen queue. This is the - * number of outstanding yet-to-be-serviced requests for a connection on a - * server socket, more than this number of outstanding requests and the - * connection request will fail. - */ - -#ifndef SOMAXCONN -# define SOMAXCONN 100 -#endif /* SOMAXCONN */ - -#if (SOMAXCONN < 100) -# undef SOMAXCONN -# define SOMAXCONN 100 -#endif /* SOMAXCONN < 100 */ - -/* - * The following defines how much buffer space the kernel should maintain for - * a socket. - */ - -#define SOCKET_BUFSIZE 4096 - -/* * Static routines for this file: */ -static TcpState * CreateSocket(Tcl_Interp *interp, int port, - const char *host, int server, const char *myaddr, - int myport, int async); -static int CreateSocketAddress(struct sockaddr_in *sockaddrPtr, - const char *host, int port, int willBind, - const char **errorMsgPtr); static int FileBlockModeProc(ClientData instanceData, int mode); static int FileCloseProc(ClientData instanceData, Tcl_Interp *interp); @@ -214,23 +163,6 @@ static int FileTruncateProc(ClientData instanceData, static Tcl_WideInt FileWideSeekProc(ClientData instanceData, Tcl_WideInt offset, int mode, int *errorCode); static void FileWatchProc(ClientData instanceData, int mask); -static void TcpAccept(ClientData data, int mask); -static int TcpBlockModeProc(ClientData data, int mode); -static int TcpCloseProc(ClientData instanceData, - Tcl_Interp *interp); -static int TcpClose2Proc(ClientData instanceData, - Tcl_Interp *interp, - int flags); -static int TcpGetHandleProc(ClientData instanceData, - int direction, ClientData *handlePtr); -static int TcpGetOptionProc(ClientData instanceData, - Tcl_Interp *interp, const char *optionName, - Tcl_DString *dsPtr); -static int TcpInputProc(ClientData instanceData, char *buf, - int toRead, int *errorCode); -static int TcpOutputProc(ClientData instanceData, - const char *buf, int toWrite, int *errorCode); -static void TcpWatchProc(ClientData instanceData, int mask); #ifdef SUPPORTS_TTY static void TtyGetAttributes(int fd, TtyAttrs *ttyPtr); static int TtyGetOptionProc(ClientData instanceData, @@ -250,9 +182,6 @@ static int TtySetOptionProc(ClientData instanceData, Tcl_Interp *interp, const char *optionName, const char *value); #endif /* SUPPORTS_TTY */ -static int WaitForConnect(TcpState *statePtr, int *errorCodePtr); -static Tcl_Channel MakeTcpClientChannelMode(ClientData tcpSocket, - int mode); /* * This structure describes the channel type structure for file based IO: @@ -305,30 +234,6 @@ static Tcl_ChannelType ttyChannelType = { }; #endif /* SUPPORTS_TTY */ -/* - * This structure describes the channel type structure for TCP socket - * based IO: - */ - -static Tcl_ChannelType tcpChannelType = { - "tcp", /* Type name. */ - TCL_CHANNEL_VERSION_5, /* v5 channel */ - TcpCloseProc, /* Close proc. */ - TcpInputProc, /* Input proc. */ - TcpOutputProc, /* Output proc. */ - NULL, /* Seek proc. */ - NULL, /* Set option proc. */ - TcpGetOptionProc, /* Get option proc. */ - TcpWatchProc, /* Initialize notifier. */ - TcpGetHandleProc, /* Get OS handles out of channel. */ - TcpClose2Proc, /* Close2 proc. */ - TcpBlockModeProc, /* Set blocking or non-blocking mode.*/ - NULL, /* flush proc. */ - NULL, /* handler proc. */ - NULL, /* wide seek proc. */ - NULL, /* thread action proc. */ - NULL, /* truncate proc. */ -}; /* *---------------------------------------------------------------------- @@ -1773,7 +1678,7 @@ Tcl_MakeFileChannel( if (getsockname(fd, (struct sockaddr *)&sockaddr, &sockaddrLen) == 0 && sockaddrLen > 0 && sockaddr.sa_family == AF_INET) { - return MakeTcpClientChannelMode((ClientData) INT2PTR(fd), mode); + return TclpMakeTcpClientChannelMode((ClientData) INT2PTR(fd), mode); } else { channelTypePtr = &fileChannelType; fsPtr = (FileState *) ckalloc((unsigned) sizeof(FileState)); @@ -1791,1048 +1696,6 @@ Tcl_MakeFileChannel( /* *---------------------------------------------------------------------- * - * TcpBlockModeProc -- - * - * This function is invoked by the generic IO level to set blocking and - * nonblocking mode on a TCP socket based channel. - * - * Results: - * 0 if successful, errno when failed. - * - * Side effects: - * Sets the device into blocking or nonblocking mode. - * - *---------------------------------------------------------------------- - */ - - /* ARGSUSED */ -static int -TcpBlockModeProc( - ClientData instanceData, /* Socket state. */ - int mode) /* The mode to set. Can be one of - * TCL_MODE_BLOCKING or - * TCL_MODE_NONBLOCKING. */ -{ - TcpState *statePtr = (TcpState *) instanceData; - - if (mode == TCL_MODE_BLOCKING) { - CLEAR_BITS(statePtr->flags, TCP_ASYNC_SOCKET); - } else { - SET_BITS(statePtr->flags, TCP_ASYNC_SOCKET); - } - if (TclUnixSetBlockingMode(statePtr->fd, mode) < 0) { - return errno; - } - return 0; -} - -/* - *---------------------------------------------------------------------- - * - * WaitForConnect -- - * - * Wait for a connection on an asynchronously opened socket to be - * completed. In nonblocking mode, just test if the connection - * has completed without blocking. - * - * Results: - * 0 if the connection has completed, -1 if still in progress - * or there is an error. - * - *---------------------------------------------------------------------- - */ - -static int -WaitForConnect( - TcpState *statePtr, /* State of the socket. */ - int *errorCodePtr) /* Where to store errors? */ -{ - int timeOut; /* How long to wait. */ - int state; /* Of calling TclWaitForFile. */ - - /* - * If an asynchronous connect is in progress, attempt to wait for it to - * complete before reading. - */ - - if (statePtr->flags & TCP_ASYNC_CONNECT) { - if (statePtr->flags & TCP_ASYNC_SOCKET) { - timeOut = 0; - } else { - timeOut = -1; - } - errno = 0; - state = TclUnixWaitForFile(statePtr->fd, - TCL_WRITABLE | TCL_EXCEPTION, timeOut); - if (state & TCL_EXCEPTION) { - return -1; - } - if (state & TCL_WRITABLE) { - CLEAR_BITS(statePtr->flags, TCP_ASYNC_CONNECT); - } else if (timeOut == 0) { - *errorCodePtr = errno = EWOULDBLOCK; - return -1; - } - } - return 0; -} - -/* - *---------------------------------------------------------------------- - * - * TcpInputProc -- - * - * This function is invoked by the generic IO level to read input from a - * TCP socket based channel. - * - * NOTE: We cannot share code with FilePipeInputProc because here we must - * use recv to obtain the input from the channel, not read. - * - * Results: - * The number of bytes read is returned or -1 on error. An output - * argument contains the POSIX error code on error, or zero if no error - * occurred. - * - * Side effects: - * Reads input from the input device of the channel. - * - *---------------------------------------------------------------------- - */ - - /* ARGSUSED */ -static int -TcpInputProc( - ClientData instanceData, /* Socket state. */ - char *buf, /* Where to store data read. */ - int bufSize, /* How much space is available in the - * buffer? */ - int *errorCodePtr) /* Where to store error code. */ -{ - TcpState *statePtr = (TcpState *) instanceData; - int bytesRead; - - *errorCodePtr = 0; - if (WaitForConnect(statePtr, errorCodePtr) != 0) { - return -1; - } - bytesRead = recv(statePtr->fd, buf, (size_t) bufSize, 0); - if (bytesRead > -1) { - return bytesRead; - } - if (errno == ECONNRESET) { - /* - * Turn ECONNRESET into a soft EOF condition. - */ - - return 0; - } - *errorCodePtr = errno; - return -1; -} - -/* - *---------------------------------------------------------------------- - * - * TcpOutputProc -- - * - * This function is invoked by the generic IO level to write output to a - * TCP socket based channel. - * - * NOTE: We cannot share code with FilePipeOutputProc because here we - * must use send, not write, to get reliable error reporting. - * - * Results: - * The number of bytes written is returned. An output argument is set to - * a POSIX error code if an error occurred, or zero. - * - * Side effects: - * Writes output on the output device of the channel. - * - *---------------------------------------------------------------------- - */ - -static int -TcpOutputProc( - ClientData instanceData, /* Socket state. */ - const char *buf, /* The data buffer. */ - int toWrite, /* How many bytes to write? */ - int *errorCodePtr) /* Where to store error code. */ -{ - TcpState *statePtr = (TcpState *) instanceData; - int written; - - *errorCodePtr = 0; - if (WaitForConnect(statePtr, errorCodePtr) != 0) { - return -1; - } - written = send(statePtr->fd, buf, (size_t) toWrite, 0); - if (written > -1) { - return written; - } - *errorCodePtr = errno; - return -1; -} - -/* - *---------------------------------------------------------------------- - * - * TcpCloseProc -- - * - * This function is invoked by the generic IO level to perform - * channel-type-specific cleanup when a TCP socket based channel is - * closed. - * - * Results: - * 0 if successful, the value of errno if failed. - * - * Side effects: - * Closes the socket of the channel. - * - *---------------------------------------------------------------------- - */ - - /* ARGSUSED */ -static int -TcpCloseProc( - ClientData instanceData, /* The socket to close. */ - Tcl_Interp *interp) /* For error reporting - unused. */ -{ - TcpState *statePtr = (TcpState *) instanceData; - int errorCode = 0; - - /* - * Delete a file handler that may be active for this socket if this is a - * server socket - the file handler was created automatically by Tcl as - * part of the mechanism to accept new client connections. Channel - * handlers are already deleted in the generic IO channel closing code - * that called this function, so we do not have to delete them here. - */ - - Tcl_DeleteFileHandler(statePtr->fd); - - if (close(statePtr->fd) < 0) { - errorCode = errno; - } - ckfree((char *) statePtr); - - return errorCode; -} - -/* - *---------------------------------------------------------------------- - * - * TcpClose2Proc -- - * - * This function is called by the generic IO level to perform the channel - * type specific part of a half-close: namely, a shutdown() on a socket. - * - * Results: - * 0 if successful, the value of errno if failed. - * - * Side effects: - * Shuts down one side of the socket. - * - *---------------------------------------------------------------------- - */ - -static int -TcpClose2Proc( - ClientData instanceData, /* The socket to close. */ - Tcl_Interp *interp, /* For error reporting. */ - int flags) /* Flags that indicate which side to close. */ -{ - TcpState *statePtr = (TcpState *) instanceData; - int errorCode = 0; - int sd; - - /* - * Shutdown the OS socket handle. - */ - switch(flags) - { - case TCL_CLOSE_READ: - sd=SHUT_RD; - break; - case TCL_CLOSE_WRITE: - sd=SHUT_WR; - break; - default: - if (interp) { - Tcl_AppendResult(interp, "Socket close2proc called bidirectionally", NULL); - } - return TCL_ERROR; - } - if (shutdown(statePtr->fd,sd)<0) { - errorCode = errno; - } - - return errorCode; -} - -/* - *---------------------------------------------------------------------- - * - * 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. Sets - * Error message if needed. - * - * Side effects: - * None. - * - *---------------------------------------------------------------------- - */ - -static int -TcpGetOptionProc( - ClientData instanceData, /* Socket state. */ - Tcl_Interp *interp, /* For error reporting - can be NULL. */ - const 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. */ -{ - TcpState *statePtr = (TcpState *) instanceData; - struct sockaddr_in sockname; - struct sockaddr_in peername; - struct hostent *hostEntPtr; - socklen_t size = sizeof(struct sockaddr_in); - size_t len = 0; - char buf[TCL_INTEGER_SPACE]; - - if (optionName != NULL) { - len = strlen(optionName); - } - - if ((len > 1) && (optionName[1] == 'e') && - (strncmp(optionName, "-error", len) == 0)) { - socklen_t optlen = sizeof(int); - int err, ret; - - ret = getsockopt(statePtr->fd, SOL_SOCKET, SO_ERROR, - (char *)&err, &optlen); - if (ret < 0) { - err = errno; - } - if (err != 0) { - Tcl_DStringAppend(dsPtr, Tcl_ErrnoMsg(err), -1); - } - return TCL_OK; - } - - if ((len == 0) || - ((len > 1) && (optionName[1] == 'p') && - (strncmp(optionName, "-peername", len) == 0))) { - if (getpeername(statePtr->fd, (struct sockaddr *) &peername, - &size) >= 0) { - if (len == 0) { - Tcl_DStringAppendElement(dsPtr, "-peername"); - Tcl_DStringStartSublist(dsPtr); - } - Tcl_DStringAppendElement(dsPtr, inet_ntoa(peername.sin_addr)); - hostEntPtr = TclpGetHostByAddr( /* INTL: Native. */ - (char *) &peername.sin_addr, - sizeof(peername.sin_addr), AF_INET); - if (hostEntPtr != NULL) { - Tcl_DString ds; - - Tcl_ExternalToUtfDString(NULL, hostEntPtr->h_name, -1, &ds); - Tcl_DStringAppendElement(dsPtr, Tcl_DStringValue(&ds)); - Tcl_DStringFree(&ds); - } else { - Tcl_DStringAppendElement(dsPtr, inet_ntoa(peername.sin_addr)); - } - TclFormatInt(buf, 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). - * Same must be done on win&mac. - */ - - if (len) { - if (interp) { - Tcl_AppendResult(interp, "can't get peername: ", - Tcl_PosixError(interp), NULL); - } - return TCL_ERROR; - } - } - } - - if ((len == 0) || - ((len > 1) && (optionName[1] == 's') && - (strncmp(optionName, "-sockname", len) == 0))) { - if (getsockname(statePtr->fd, (struct sockaddr *) &sockname, - &size) >= 0) { - if (len == 0) { - Tcl_DStringAppendElement(dsPtr, "-sockname"); - Tcl_DStringStartSublist(dsPtr); - } - Tcl_DStringAppendElement(dsPtr, inet_ntoa(sockname.sin_addr)); - hostEntPtr = TclpGetHostByAddr( /* INTL: Native. */ - (char *) &sockname.sin_addr, - sizeof(sockname.sin_addr), AF_INET); - if (hostEntPtr != NULL) { - Tcl_DString ds; - - Tcl_ExternalToUtfDString(NULL, hostEntPtr->h_name, -1, &ds); - Tcl_DStringAppendElement(dsPtr, Tcl_DStringValue(&ds)); - Tcl_DStringFree(&ds); - } else { - Tcl_DStringAppendElement(dsPtr, inet_ntoa(sockname.sin_addr)); - } - TclFormatInt(buf, ntohs(sockname.sin_port)); - Tcl_DStringAppendElement(dsPtr, buf); - if (len == 0) { - Tcl_DStringEndSublist(dsPtr); - } else { - return TCL_OK; - } - } else { - if (interp) { - Tcl_AppendResult(interp, "can't get sockname: ", - Tcl_PosixError(interp), NULL); - } - return TCL_ERROR; - } - } - - if (len > 0) { - return Tcl_BadChannelOption(interp, optionName, "peername sockname"); - } - - return TCL_OK; -} - -/* - *---------------------------------------------------------------------- - * - * TcpWatchProc -- - * - * Initialize the notifier to watch the fd from this channel. - * - * Results: - * None. - * - * Side effects: - * Sets up the notifier so that a future event on the channel will be - * seen by Tcl. - * - *---------------------------------------------------------------------- - */ - -static void -TcpWatchProc( - ClientData instanceData, /* The socket state. */ - int mask) /* Events of interest; an OR-ed combination of - * TCL_READABLE, TCL_WRITABLE and - * TCL_EXCEPTION. */ -{ - TcpState *statePtr = (TcpState *) instanceData; - - /* - * Make sure we don't mess with server sockets since they will never be - * readable or writable at the Tcl level. This keeps Tcl scripts from - * interfering with the -accept behavior. - */ - - if (!statePtr->acceptProc) { - if (mask) { - Tcl_CreateFileHandler(statePtr->fd, mask, - (Tcl_FileProc *) Tcl_NotifyChannel, - (ClientData) statePtr->channel); - } else { - Tcl_DeleteFileHandler(statePtr->fd); - } - } -} - -/* - *---------------------------------------------------------------------- - * - * TcpGetHandleProc -- - * - * Called from Tcl_GetChannelHandle to retrieve OS handles from inside a - * TCP socket based channel. - * - * Results: - * Returns TCL_OK with the fd in handlePtr, or TCL_ERROR if there is no - * handle for the specified direction. - * - * Side effects: - * None. - * - *---------------------------------------------------------------------- - */ - - /* ARGSUSED */ -static int -TcpGetHandleProc( - ClientData instanceData, /* The socket state. */ - int direction, /* Not used. */ - ClientData *handlePtr) /* Where to store the handle. */ -{ - TcpState *statePtr = (TcpState *) instanceData; - - *handlePtr = (ClientData) INT2PTR(statePtr->fd); - return TCL_OK; -} - -/* - *---------------------------------------------------------------------- - * - * CreateSocket -- - * - * This function opens a new socket in client or server mode and - * initializes the TcpState structure. - * - * Results: - * Returns a new TcpState, or NULL with an error in the interp's result, - * if interp is not NULL. - * - * Side effects: - * Opens a socket. - * - *---------------------------------------------------------------------- - */ - -static TcpState * -CreateSocket( - Tcl_Interp *interp, /* For error reporting; can be NULL. */ - int port, /* Port number to open. */ - const char *host, /* Name of host on which to open port. NULL - * implies INADDR_ANY */ - int server, /* 1 if socket should be a server socket, else - * 0 for a client socket. */ - const char *myaddr, /* Optional client-side address */ - int myport, /* Optional client-side port */ - int async) /* If nonzero and creating a client socket, - * attempt to do an async connect. Otherwise - * do a synchronous connect or bind. */ -{ - int status = 0, sock = -1; - struct sockaddr_in sockaddr; /* socket address */ - struct sockaddr_in mysockaddr; /* Socket address for client */ - TcpState *statePtr; - const char *errorMsg = NULL; - - if (!CreateSocketAddress(&sockaddr, host, port, 0, &errorMsg)) { - goto error; - } - if ((myaddr != NULL || myport != 0) && - !CreateSocketAddress(&mysockaddr, myaddr, myport, 1, &errorMsg)) { - goto error; - } - - sock = socket(AF_INET, SOCK_STREAM, 0); - if (sock < 0) { - goto error; - } - - /* - * Set the close-on-exec flag so that the socket will not get inherited by - * child processes. - */ - - fcntl(sock, F_SETFD, FD_CLOEXEC); - - /* - * Set kernel space buffering - */ - - TclSockMinimumBuffers(sock, SOCKET_BUFSIZE); - - status = 0; - if (server) { - /* - * Set up to reuse server addresses automatically and bind to the - * specified port. - */ - - int reuseaddr = 1; - (void) setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, - (char *) &reuseaddr, sizeof(reuseaddr)); - status = bind(sock, (struct sockaddr *) &sockaddr, - sizeof(struct sockaddr)); - if (status != -1) { - status = listen(sock, SOMAXCONN); - } - } else { - if (myaddr != NULL || myport != 0) { - int reuseaddr = 1; - (void) setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, - (char *) &reuseaddr, sizeof(reuseaddr)); - status = bind(sock, (struct sockaddr *) &mysockaddr, - sizeof(struct sockaddr)); - if (status < 0) { - goto error; - } - } - - /* - * Attempt to connect. The connect may fail at present with an - * EINPROGRESS but at a later time it will complete. The caller will - * set up a file handler on the socket if she is interested in being - * informed when the connect completes. - */ - - if (async) { - status = TclUnixSetBlockingMode(sock, TCL_MODE_NONBLOCKING); - if (status < 0) { - goto error; - } - } - - status = connect(sock, (struct sockaddr *) &sockaddr, - sizeof(sockaddr)); - if (status < 0) { - if (errno == EINPROGRESS) { - status = 0; - } else { - goto error; - } - } - if (async) { - /* - * Restore blocking mode. - */ - status = TclUnixSetBlockingMode(sock, TCL_MODE_BLOCKING); - } - } - - if (status < 0) { -error: - if (interp != NULL) { - Tcl_AppendResult(interp, "couldn't open socket: ", - Tcl_PosixError(interp), NULL); - if (errorMsg != NULL) { - Tcl_AppendResult(interp, " (", errorMsg, ")", NULL); - } - } - if (sock != -1) { - close(sock); - } - return NULL; - } - - /* - * Allocate a new TcpState for this socket. - */ - - statePtr = (TcpState *) ckalloc((unsigned) sizeof(TcpState)); - statePtr->flags = async ? TCP_ASYNC_CONNECT : 0; - statePtr->fd = sock; - - return statePtr; -} - -/* - *---------------------------------------------------------------------- - * - * 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( - struct sockaddr_in *sockaddrPtr, /* Socket address */ - const char *host, /* Host. NULL implies INADDR_ANY */ - int port, /* Port number */ - int willBind, /* Is this an address to bind() to or - * to connect() to? */ - const char **errorMsgPtr) /* Place to store the error message - * detail, if available. */ -{ -#ifdef HAVE_GETADDRINFO - struct addrinfo hints, *resPtr = NULL; - char *native; - Tcl_DString ds; - int result; - - if (host == NULL) { - sockaddrPtr->sin_family = AF_INET; - sockaddrPtr->sin_addr.s_addr = INADDR_ANY; - addPort: - sockaddrPtr->sin_port = htons((unsigned short) (port & 0xFFFF)); - return 1; - } - - (void) memset(&hints, 0, sizeof(struct addrinfo)); - hints.ai_family = AF_INET; - hints.ai_socktype = SOCK_STREAM; - if (willBind) { - hints.ai_flags |= AI_PASSIVE; - } - - /* - * Note that getaddrinfo() *is* thread-safe. If a platform doesn't get - * that right, it shouldn't use this part of the code. - */ - - native = Tcl_UtfToExternalDString(NULL, host, -1, &ds); - result = getaddrinfo(native, NULL, &hints, &resPtr); - Tcl_DStringFree(&ds); - if (result == 0) { - memcpy(sockaddrPtr, resPtr->ai_addr, sizeof(struct sockaddr_in)); - freeaddrinfo(resPtr); - goto addPort; - } - - /* - * Ought to use gai_strerror() here... - */ - - switch (result) { - case EAI_NONAME: - case EAI_SERVICE: -#if defined(EAI_ADDRFAMILY) && EAI_ADDRFAMILY != EAI_NONAME - case EAI_ADDRFAMILY: -#endif -#if defined(EAI_NODATA) && EAI_NODATA != EAI_NONAME - case EAI_NODATA: -#endif - *errorMsgPtr = gai_strerror(result); - errno = EHOSTUNREACH; - return 0; - case EAI_SYSTEM: - return 0; - default: - *errorMsgPtr = gai_strerror(result); - errno = ENXIO; - return 0; - } -#else /* !HAVE_GETADDRINFO */ - struct in_addr addr; /* For 64/32 bit madness */ - - (void) memset(sockaddrPtr, '\0', sizeof(struct sockaddr_in)); - sockaddrPtr->sin_family = AF_INET; - sockaddrPtr->sin_port = htons((unsigned short) (port & 0xFFFF)); - if (host == NULL) { - addr.s_addr = INADDR_ANY; - } else { - struct hostent *hostent; /* Host database entry */ - Tcl_DString ds; - const char *native; - - if (host == NULL) { - native = NULL; - } else { - native = Tcl_UtfToExternalDString(NULL, host, -1, &ds); - } - addr.s_addr = inet_addr(native); /* INTL: Native. */ - - /* - * This is 0xFFFFFFFF to ensure that it compares as a 32bit -1 on - * either 32 or 64 bits systems. - */ - - if (addr.s_addr == 0xFFFFFFFF) { - hostent = TclpGetHostByName(native); /* INTL: Native. */ - if (hostent != NULL) { - memcpy(&addr, hostent->h_addr_list[0], - (size_t) hostent->h_length); - } else { -#ifdef EHOSTUNREACH - errno = EHOSTUNREACH; -#else /* !EHOSTUNREACH */ -#ifdef ENXIO - errno = ENXIO; -#endif /* ENXIO */ -#endif /* EHOSTUNREACH */ - if (native != NULL) { - Tcl_DStringFree(&ds); - } - return 0; /* Error. */ - } - } - if (native != NULL) { - Tcl_DStringFree(&ds); - } - } - - /* - * 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. */ -#endif /* HAVE_GETADDRINFO */ -} - -/* - *---------------------------------------------------------------------- - * - * 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( - Tcl_Interp *interp, /* For error reporting; can be NULL. */ - int port, /* Port number to open. */ - const char *host, /* Host on which to open port. */ - const char *myaddr, /* Client-side address */ - int myport, /* Client-side port */ - int async) /* If nonzero, attempt to do an asynchronous - * connect. Otherwise we do a blocking - * connect. */ -{ - TcpState *statePtr; - char channelName[16 + TCL_INTEGER_SPACE]; - - /* - * Create a new client socket and wrap it in a channel. - */ - - statePtr = CreateSocket(interp, port, host, 0, myaddr, myport, async); - if (statePtr == NULL) { - return NULL; - } - - statePtr->acceptProc = NULL; - statePtr->acceptProcData = NULL; - - sprintf(channelName, "sock%d", statePtr->fd); - - statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName, - (ClientData) statePtr, (TCL_READABLE | TCL_WRITABLE)); - if (Tcl_SetChannelOption(interp, statePtr->channel, "-translation", - "auto crlf") == TCL_ERROR) { - Tcl_Close(NULL, statePtr->channel); - return NULL; - } - return statePtr->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. - * - *---------------------------------------------------------------------- - */ - -Tcl_Channel -Tcl_MakeTcpClientChannel( - ClientData sock) /* The socket to wrap up into a channel. */ -{ - return MakeTcpClientChannelMode(sock, (TCL_READABLE | TCL_WRITABLE)); -} - -/* - *---------------------------------------------------------------------- - * - * MakeTcpClientChannelMode -- - * - * Creates a Tcl_Channel from an existing client TCP socket - * with given mode. - * - * Results: - * The Tcl_Channel wrapped around the preexisting TCP socket. - * - * Side effects: - * None. - * - *---------------------------------------------------------------------- - */ - -static Tcl_Channel -MakeTcpClientChannelMode( - ClientData sock, /* The socket to wrap up into a channel. */ - int mode) /* ORed combination of TCL_READABLE and - * TCL_WRITABLE to indicate file mode. */ -{ - TcpState *statePtr; - char channelName[16 + TCL_INTEGER_SPACE]; - - statePtr = (TcpState *) ckalloc((unsigned) sizeof(TcpState)); - statePtr->fd = PTR2INT(sock); - statePtr->flags = 0; - statePtr->acceptProc = NULL; - statePtr->acceptProcData = NULL; - - sprintf(channelName, "sock%d", statePtr->fd); - - statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName, - (ClientData) statePtr, mode); - if (Tcl_SetChannelOption(NULL, statePtr->channel, "-translation", - "auto crlf") == TCL_ERROR) { - Tcl_Close(NULL, statePtr->channel); - return NULL; - } - return statePtr->channel; -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_OpenTcpServer -- - * - * Opens a TCP server socket and creates a channel around it. - * - * Results: - * The channel or NULL if failed. If an error occurred, an error message - * is left in the interp's result if interp is not NULL. - * - * Side effects: - * Opens a server socket and creates a new channel. - * - *---------------------------------------------------------------------- - */ - -Tcl_Channel -Tcl_OpenTcpServer( - Tcl_Interp *interp, /* For error reporting - may be NULL. */ - int port, /* Port number to open. */ - const char *myHost, /* Name of local host. */ - Tcl_TcpAcceptProc *acceptProc, - /* Callback for accepting connections from new - * clients. */ - ClientData acceptProcData) /* Data for the callback. */ -{ - TcpState *statePtr; - char channelName[16 + TCL_INTEGER_SPACE]; - - /* - * Create a new client socket and wrap it in a channel. - */ - - statePtr = CreateSocket(interp, port, myHost, 1, NULL, 0, 0); - if (statePtr == NULL) { - return NULL; - } - - statePtr->acceptProc = acceptProc; - statePtr->acceptProcData = acceptProcData; - - /* - * Set up the callback mechanism for accepting connections from new - * clients. - */ - - Tcl_CreateFileHandler(statePtr->fd, TCL_READABLE, TcpAccept, - (ClientData) statePtr); - sprintf(channelName, "sock%d", statePtr->fd); - statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName, - (ClientData) statePtr, 0); - return statePtr->channel; -} - -/* - *---------------------------------------------------------------------- - * - * TcpAccept -- - * Accept a TCP socket connection. This is called by the event loop. - * - * Results: - * None. - * - * Side effects: - * Creates a new connection socket. Calls the registered callback for the - * connection acceptance mechanism. - * - *---------------------------------------------------------------------- - */ - - /* ARGSUSED */ -static void -TcpAccept( - ClientData data, /* Callback token. */ - int mask) /* Not used. */ -{ - TcpState *sockState; /* Client data of server socket. */ - int newsock; /* The new client socket */ - TcpState *newSockState; /* State for new socket. */ - struct sockaddr_in addr; /* The remote address */ - socklen_t len; /* For accept interface */ - char channelName[16 + TCL_INTEGER_SPACE]; - - sockState = (TcpState *) data; - - len = sizeof(struct sockaddr_in); - newsock = accept(sockState->fd, (struct sockaddr *) &addr, &len); - if (newsock < 0) { - return; - } - - /* - * Set close-on-exec flag to prevent the newly accepted socket from being - * inherited by child processes. - */ - - (void) fcntl(newsock, F_SETFD, FD_CLOEXEC); - - newSockState = (TcpState *) ckalloc((unsigned) sizeof(TcpState)); - - newSockState->flags = 0; - newSockState->fd = newsock; - newSockState->acceptProc = NULL; - newSockState->acceptProcData = NULL; - - sprintf(channelName, "sock%d", newsock); - newSockState->channel = Tcl_CreateChannel(&tcpChannelType, channelName, - (ClientData) newSockState, (TCL_READABLE | TCL_WRITABLE)); - - Tcl_SetChannelOption(NULL, newSockState->channel, "-translation", - "auto crlf"); - - if (sockState->acceptProc != NULL) { - sockState->acceptProc(sockState->acceptProcData, - newSockState->channel, inet_ntoa(addr.sin_addr), - ntohs(addr.sin_port)); - } -} - -/* - *---------------------------------------------------------------------- - * * TclpGetDefaultStdChannel -- * * Creates channels for standard input, standard output or standard error @@ -2983,7 +1846,7 @@ Tcl_GetOpenFile( #ifdef SUPPORTS_TTY || (chanTypePtr == &ttyChannelType) #endif /* SUPPORTS_TTY */ - || (chanTypePtr == &tcpChannelType) + || (strcmp(chanTypePtr->typeName, "tcp") == 0) || (strcmp(chanTypePtr->typeName, "pipe") == 0)) { if (Tcl_GetChannelHandle(chan, (forWriting ? TCL_WRITABLE : TCL_READABLE), diff --git a/unix/tclUnixPort.h b/unix/tclUnixPort.h index 4b7d20b..bc387ca 100644 --- a/unix/tclUnixPort.h +++ b/unix/tclUnixPort.h @@ -19,7 +19,7 @@ * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclUnixPort.h,v 1.68 2008/09/03 05:43:32 dgp Exp $ + * RCS: @(#) $Id: tclUnixPort.h,v 1.69 2009/06/15 16:24:45 rmax Exp $ */ #ifndef _TCLUNIXPORT @@ -620,5 +620,7 @@ MODULE_SCOPE struct passwd* TclpGetPwUid(uid_t uid); MODULE_SCOPE struct group* TclpGetGrGid(gid_t gid); MODULE_SCOPE struct hostent* TclpGetHostByName(const char *name); MODULE_SCOPE struct hostent* TclpGetHostByAddr(const char *addr, int length, int type); +MODULE_SCOPE Tcl_Channel TclpMakeTcpClientChannelMode(ClientData tcpSocket, int mode); + #endif /* _TCLUNIXPORT */ diff --git a/unix/tclUnixSock.c b/unix/tclUnixSock.c index cbfe546..4ed2392 100644 --- a/unix/tclUnixSock.c +++ b/unix/tclUnixSock.c @@ -8,12 +8,120 @@ * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclUnixSock.c,v 1.21 2008/04/27 22:21:35 dkf Exp $ + * RCS: @(#) $Id: tclUnixSock.c,v 1.22 2009/06/15 16:24:45 rmax Exp $ */ #include "tclInt.h" /* + * Helper macros to make parts of this file clearer. The macros do exactly + * what they say on the tin. :-) They also only ever refer to their arguments + * once, and so can be used without regard to side effects. + */ + +#define SET_BITS(var, bits) ((var) |= (bits)) +#define CLEAR_BITS(var, bits) ((var) &= ~(bits)) + +/* + * This structure describes per-instance state of a tcp based channel. + */ + +typedef struct TcpState { + Tcl_Channel channel; /* Channel associated with this file. */ + int fd; /* The socket itself. */ + int flags; /* ORed combination of the bitfields defined + * below. */ + Tcl_TcpAcceptProc *acceptProc; + /* Proc to call on accept. */ + ClientData acceptProcData; /* The data for the accept proc. */ +} TcpState; + +/* + * These bits may be ORed together into the "flags" field of a TcpState + * structure. + */ + +#define TCP_ASYNC_SOCKET (1<<0) /* Asynchronous socket. */ +#define TCP_ASYNC_CONNECT (1<<1) /* Async connect in progress. */ + +/* + * The following defines the maximum length of the listen queue. This is the + * number of outstanding yet-to-be-serviced requests for a connection on a + * server socket, more than this number of outstanding requests and the + * connection request will fail. + */ + +#ifndef SOMAXCONN +# define SOMAXCONN 100 +#endif /* SOMAXCONN */ + +#if (SOMAXCONN < 100) +# undef SOMAXCONN +# define SOMAXCONN 100 +#endif /* SOMAXCONN < 100 */ + +/* + * The following defines how much buffer space the kernel should maintain for + * a socket. + */ + +#define SOCKET_BUFSIZE 4096 + +/* + * Static routines for this file: + */ + +static TcpState * CreateSocket(Tcl_Interp *interp, int port, + const char *host, int server, const char *myaddr, + int myport, int async); +static int CreateSocketAddress(struct sockaddr_in *sockaddrPtr, + const char *host, int port, int willBind, + const char **errorMsgPtr); +static void TcpAccept(ClientData data, int mask); +static int TcpBlockModeProc(ClientData data, int mode); +static int TcpCloseProc(ClientData instanceData, + Tcl_Interp *interp); +static int TcpClose2Proc(ClientData instanceData, + Tcl_Interp *interp, + int flags); +static int TcpGetHandleProc(ClientData instanceData, + int direction, ClientData *handlePtr); +static int TcpGetOptionProc(ClientData instanceData, + Tcl_Interp *interp, const char *optionName, + Tcl_DString *dsPtr); +static int TcpInputProc(ClientData instanceData, char *buf, + int toRead, int *errorCode); +static int TcpOutputProc(ClientData instanceData, + const char *buf, int toWrite, int *errorCode); +static void TcpWatchProc(ClientData instanceData, int mask); +static int WaitForConnect(TcpState *statePtr, int *errorCodePtr); +/* + * This structure describes the channel type structure for TCP socket + * based IO: + */ + +static Tcl_ChannelType tcpChannelType = { + "tcp", /* Type name. */ + TCL_CHANNEL_VERSION_5, /* v5 channel */ + TcpCloseProc, /* Close proc. */ + TcpInputProc, /* Input proc. */ + TcpOutputProc, /* Output proc. */ + NULL, /* Seek proc. */ + NULL, /* Set option proc. */ + TcpGetOptionProc, /* Get option proc. */ + TcpWatchProc, /* Initialize notifier. */ + TcpGetHandleProc, /* Get OS handles out of channel. */ + TcpClose2Proc, /* Close2 proc. */ + TcpBlockModeProc, /* Set blocking or non-blocking mode.*/ + NULL, /* flush proc. */ + NULL, /* handler proc. */ + NULL, /* wide seek proc. */ + NULL, /* thread action proc. */ + NULL, /* truncate proc. */ +}; + + +/* * The following variable holds the network name of this host. */ @@ -181,6 +289,1048 @@ TclpFinalizeSockets(void) } /* + *---------------------------------------------------------------------- + * + * TcpBlockModeProc -- + * + * This function is invoked by the generic IO level to set blocking and + * nonblocking mode on a TCP socket based channel. + * + * Results: + * 0 if successful, errno when failed. + * + * Side effects: + * Sets the device into blocking or nonblocking mode. + * + *---------------------------------------------------------------------- + */ + + /* ARGSUSED */ +static int +TcpBlockModeProc( + ClientData instanceData, /* Socket state. */ + int mode) /* The mode to set. Can be one of + * TCL_MODE_BLOCKING or + * TCL_MODE_NONBLOCKING. */ +{ + TcpState *statePtr = (TcpState *) instanceData; + + if (mode == TCL_MODE_BLOCKING) { + CLEAR_BITS(statePtr->flags, TCP_ASYNC_SOCKET); + } else { + SET_BITS(statePtr->flags, TCP_ASYNC_SOCKET); + } + if (TclUnixSetBlockingMode(statePtr->fd, mode) < 0) { + return errno; + } + return 0; +} + +/* + *---------------------------------------------------------------------- + * + * WaitForConnect -- + * + * Wait for a connection on an asynchronously opened socket to be + * completed. In nonblocking mode, just test if the connection + * has completed without blocking. + * + * Results: + * 0 if the connection has completed, -1 if still in progress + * or there is an error. + * + *---------------------------------------------------------------------- + */ + +static int +WaitForConnect( + TcpState *statePtr, /* State of the socket. */ + int *errorCodePtr) /* Where to store errors? */ +{ + int timeOut; /* How long to wait. */ + int state; /* Of calling TclWaitForFile. */ + + /* + * If an asynchronous connect is in progress, attempt to wait for it to + * complete before reading. + */ + + if (statePtr->flags & TCP_ASYNC_CONNECT) { + if (statePtr->flags & TCP_ASYNC_SOCKET) { + timeOut = 0; + } else { + timeOut = -1; + } + errno = 0; + state = TclUnixWaitForFile(statePtr->fd, + TCL_WRITABLE | TCL_EXCEPTION, timeOut); + if (state & TCL_EXCEPTION) { + return -1; + } + if (state & TCL_WRITABLE) { + CLEAR_BITS(statePtr->flags, TCP_ASYNC_CONNECT); + } else if (timeOut == 0) { + *errorCodePtr = errno = EWOULDBLOCK; + return -1; + } + } + return 0; +} + +/* + *---------------------------------------------------------------------- + * + * TcpInputProc -- + * + * This function is invoked by the generic IO level to read input from a + * TCP socket based channel. + * + * NOTE: We cannot share code with FilePipeInputProc because here we must + * use recv to obtain the input from the channel, not read. + * + * Results: + * The number of bytes read is returned or -1 on error. An output + * argument contains the POSIX error code on error, or zero if no error + * occurred. + * + * Side effects: + * Reads input from the input device of the channel. + * + *---------------------------------------------------------------------- + */ + + /* ARGSUSED */ +static int +TcpInputProc( + ClientData instanceData, /* Socket state. */ + char *buf, /* Where to store data read. */ + int bufSize, /* How much space is available in the + * buffer? */ + int *errorCodePtr) /* Where to store error code. */ +{ + TcpState *statePtr = (TcpState *) instanceData; + int bytesRead; + + *errorCodePtr = 0; + if (WaitForConnect(statePtr, errorCodePtr) != 0) { + return -1; + } + bytesRead = recv(statePtr->fd, buf, (size_t) bufSize, 0); + if (bytesRead > -1) { + return bytesRead; + } + if (errno == ECONNRESET) { + /* + * Turn ECONNRESET into a soft EOF condition. + */ + + return 0; + } + *errorCodePtr = errno; + return -1; +} + +/* + *---------------------------------------------------------------------- + * + * TcpOutputProc -- + * + * This function is invoked by the generic IO level to write output to a + * TCP socket based channel. + * + * NOTE: We cannot share code with FilePipeOutputProc because here we + * must use send, not write, to get reliable error reporting. + * + * Results: + * The number of bytes written is returned. An output argument is set to + * a POSIX error code if an error occurred, or zero. + * + * Side effects: + * Writes output on the output device of the channel. + * + *---------------------------------------------------------------------- + */ + +static int +TcpOutputProc( + ClientData instanceData, /* Socket state. */ + const char *buf, /* The data buffer. */ + int toWrite, /* How many bytes to write? */ + int *errorCodePtr) /* Where to store error code. */ +{ + TcpState *statePtr = (TcpState *) instanceData; + int written; + + *errorCodePtr = 0; + if (WaitForConnect(statePtr, errorCodePtr) != 0) { + return -1; + } + written = send(statePtr->fd, buf, (size_t) toWrite, 0); + if (written > -1) { + return written; + } + *errorCodePtr = errno; + return -1; +} + +/* + *---------------------------------------------------------------------- + * + * TcpCloseProc -- + * + * This function is invoked by the generic IO level to perform + * channel-type-specific cleanup when a TCP socket based channel is + * closed. + * + * Results: + * 0 if successful, the value of errno if failed. + * + * Side effects: + * Closes the socket of the channel. + * + *---------------------------------------------------------------------- + */ + + /* ARGSUSED */ +static int +TcpCloseProc( + ClientData instanceData, /* The socket to close. */ + Tcl_Interp *interp) /* For error reporting - unused. */ +{ + TcpState *statePtr = (TcpState *) instanceData; + int errorCode = 0; + + /* + * Delete a file handler that may be active for this socket if this is a + * server socket - the file handler was created automatically by Tcl as + * part of the mechanism to accept new client connections. Channel + * handlers are already deleted in the generic IO channel closing code + * that called this function, so we do not have to delete them here. + */ + + Tcl_DeleteFileHandler(statePtr->fd); + + if (close(statePtr->fd) < 0) { + errorCode = errno; + } + ckfree((char *) statePtr); + + return errorCode; +} + +/* + *---------------------------------------------------------------------- + * + * TcpClose2Proc -- + * + * This function is called by the generic IO level to perform the channel + * type specific part of a half-close: namely, a shutdown() on a socket. + * + * Results: + * 0 if successful, the value of errno if failed. + * + * Side effects: + * Shuts down one side of the socket. + * + *---------------------------------------------------------------------- + */ + +static int +TcpClose2Proc( + ClientData instanceData, /* The socket to close. */ + Tcl_Interp *interp, /* For error reporting. */ + int flags) /* Flags that indicate which side to close. */ +{ + TcpState *statePtr = (TcpState *) instanceData; + int errorCode = 0; + int sd; + + /* + * Shutdown the OS socket handle. + */ + switch(flags) + { + case TCL_CLOSE_READ: + sd=SHUT_RD; + break; + case TCL_CLOSE_WRITE: + sd=SHUT_WR; + break; + default: + if (interp) { + Tcl_AppendResult(interp, "Socket close2proc called bidirectionally", NULL); + } + return TCL_ERROR; + } + if (shutdown(statePtr->fd,sd)<0) { + errorCode = errno; + } + + return errorCode; +} + +/* + *---------------------------------------------------------------------- + * + * 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. Sets + * Error message if needed. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static int +TcpGetOptionProc( + ClientData instanceData, /* Socket state. */ + Tcl_Interp *interp, /* For error reporting - can be NULL. */ + const 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. */ +{ + TcpState *statePtr = (TcpState *) instanceData; + struct sockaddr_in sockname; + struct sockaddr_in peername; + struct hostent *hostEntPtr; + socklen_t size = sizeof(struct sockaddr_in); + size_t len = 0; + char buf[TCL_INTEGER_SPACE]; + + if (optionName != NULL) { + len = strlen(optionName); + } + + if ((len > 1) && (optionName[1] == 'e') && + (strncmp(optionName, "-error", len) == 0)) { + socklen_t optlen = sizeof(int); + int err, ret; + + ret = getsockopt(statePtr->fd, SOL_SOCKET, SO_ERROR, + (char *)&err, &optlen); + if (ret < 0) { + err = errno; + } + if (err != 0) { + Tcl_DStringAppend(dsPtr, Tcl_ErrnoMsg(err), -1); + } + return TCL_OK; + } + + if ((len == 0) || + ((len > 1) && (optionName[1] == 'p') && + (strncmp(optionName, "-peername", len) == 0))) { + if (getpeername(statePtr->fd, (struct sockaddr *) &peername, + &size) >= 0) { + if (len == 0) { + Tcl_DStringAppendElement(dsPtr, "-peername"); + Tcl_DStringStartSublist(dsPtr); + } + Tcl_DStringAppendElement(dsPtr, inet_ntoa(peername.sin_addr)); + hostEntPtr = TclpGetHostByAddr( /* INTL: Native. */ + (char *) &peername.sin_addr, + sizeof(peername.sin_addr), AF_INET); + if (hostEntPtr != NULL) { + Tcl_DString ds; + + Tcl_ExternalToUtfDString(NULL, hostEntPtr->h_name, -1, &ds); + Tcl_DStringAppendElement(dsPtr, Tcl_DStringValue(&ds)); + Tcl_DStringFree(&ds); + } else { + Tcl_DStringAppendElement(dsPtr, inet_ntoa(peername.sin_addr)); + } + TclFormatInt(buf, 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). + * Same must be done on win&mac. + */ + + if (len) { + if (interp) { + Tcl_AppendResult(interp, "can't get peername: ", + Tcl_PosixError(interp), NULL); + } + return TCL_ERROR; + } + } + } + + if ((len == 0) || + ((len > 1) && (optionName[1] == 's') && + (strncmp(optionName, "-sockname", len) == 0))) { + if (getsockname(statePtr->fd, (struct sockaddr *) &sockname, + &size) >= 0) { + if (len == 0) { + Tcl_DStringAppendElement(dsPtr, "-sockname"); + Tcl_DStringStartSublist(dsPtr); + } + Tcl_DStringAppendElement(dsPtr, inet_ntoa(sockname.sin_addr)); + hostEntPtr = TclpGetHostByAddr( /* INTL: Native. */ + (char *) &sockname.sin_addr, + sizeof(sockname.sin_addr), AF_INET); + if (hostEntPtr != NULL) { + Tcl_DString ds; + + Tcl_ExternalToUtfDString(NULL, hostEntPtr->h_name, -1, &ds); + Tcl_DStringAppendElement(dsPtr, Tcl_DStringValue(&ds)); + Tcl_DStringFree(&ds); + } else { + Tcl_DStringAppendElement(dsPtr, inet_ntoa(sockname.sin_addr)); + } + TclFormatInt(buf, ntohs(sockname.sin_port)); + Tcl_DStringAppendElement(dsPtr, buf); + if (len == 0) { + Tcl_DStringEndSublist(dsPtr); + } else { + return TCL_OK; + } + } else { + if (interp) { + Tcl_AppendResult(interp, "can't get sockname: ", + Tcl_PosixError(interp), NULL); + } + return TCL_ERROR; + } + } + + if (len > 0) { + return Tcl_BadChannelOption(interp, optionName, "peername sockname"); + } + + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * TcpWatchProc -- + * + * Initialize the notifier to watch the fd from this channel. + * + * Results: + * None. + * + * Side effects: + * Sets up the notifier so that a future event on the channel will be + * seen by Tcl. + * + *---------------------------------------------------------------------- + */ + +static void +TcpWatchProc( + ClientData instanceData, /* The socket state. */ + int mask) /* Events of interest; an OR-ed combination of + * TCL_READABLE, TCL_WRITABLE and + * TCL_EXCEPTION. */ +{ + TcpState *statePtr = (TcpState *) instanceData; + + /* + * Make sure we don't mess with server sockets since they will never be + * readable or writable at the Tcl level. This keeps Tcl scripts from + * interfering with the -accept behavior. + */ + + if (!statePtr->acceptProc) { + if (mask) { + Tcl_CreateFileHandler(statePtr->fd, mask, + (Tcl_FileProc *) Tcl_NotifyChannel, + (ClientData) statePtr->channel); + } else { + Tcl_DeleteFileHandler(statePtr->fd); + } + } +} + +/* + *---------------------------------------------------------------------- + * + * TcpGetHandleProc -- + * + * Called from Tcl_GetChannelHandle to retrieve OS handles from inside a + * TCP socket based channel. + * + * Results: + * Returns TCL_OK with the fd in handlePtr, or TCL_ERROR if there is no + * handle for the specified direction. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + + /* ARGSUSED */ +static int +TcpGetHandleProc( + ClientData instanceData, /* The socket state. */ + int direction, /* Not used. */ + ClientData *handlePtr) /* Where to store the handle. */ +{ + TcpState *statePtr = (TcpState *) instanceData; + + *handlePtr = (ClientData) INT2PTR(statePtr->fd); + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * CreateSocket -- + * + * This function opens a new socket in client or server mode and + * initializes the TcpState structure. + * + * Results: + * Returns a new TcpState, or NULL with an error in the interp's result, + * if interp is not NULL. + * + * Side effects: + * Opens a socket. + * + *---------------------------------------------------------------------- + */ + +static TcpState * +CreateSocket( + Tcl_Interp *interp, /* For error reporting; can be NULL. */ + int port, /* Port number to open. */ + const char *host, /* Name of host on which to open port. NULL + * implies INADDR_ANY */ + int server, /* 1 if socket should be a server socket, else + * 0 for a client socket. */ + const char *myaddr, /* Optional client-side address */ + int myport, /* Optional client-side port */ + int async) /* If nonzero and creating a client socket, + * attempt to do an async connect. Otherwise + * do a synchronous connect or bind. */ +{ + int status = 0, sock = -1; + struct sockaddr_in sockaddr; /* socket address */ + struct sockaddr_in mysockaddr; /* Socket address for client */ + TcpState *statePtr; + const char *errorMsg = NULL; + + if (!CreateSocketAddress(&sockaddr, host, port, 0, &errorMsg)) { + goto error; + } + if ((myaddr != NULL || myport != 0) && + !CreateSocketAddress(&mysockaddr, myaddr, myport, 1, &errorMsg)) { + goto error; + } + + sock = socket(AF_INET, SOCK_STREAM, 0); + if (sock < 0) { + goto error; + } + + /* + * Set the close-on-exec flag so that the socket will not get inherited by + * child processes. + */ + + fcntl(sock, F_SETFD, FD_CLOEXEC); + + /* + * Set kernel space buffering + */ + + TclSockMinimumBuffers(sock, SOCKET_BUFSIZE); + + status = 0; + if (server) { + /* + * Set up to reuse server addresses automatically and bind to the + * specified port. + */ + + int reuseaddr = 1; + (void) setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, + (char *) &reuseaddr, sizeof(reuseaddr)); + status = bind(sock, (struct sockaddr *) &sockaddr, + sizeof(struct sockaddr)); + if (status != -1) { + status = listen(sock, SOMAXCONN); + } + } else { + if (myaddr != NULL || myport != 0) { + int reuseaddr = 1; + (void) setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, + (char *) &reuseaddr, sizeof(reuseaddr)); + status = bind(sock, (struct sockaddr *) &mysockaddr, + sizeof(struct sockaddr)); + if (status < 0) { + goto error; + } + } + + /* + * Attempt to connect. The connect may fail at present with an + * EINPROGRESS but at a later time it will complete. The caller will + * set up a file handler on the socket if she is interested in being + * informed when the connect completes. + */ + + if (async) { + status = TclUnixSetBlockingMode(sock, TCL_MODE_NONBLOCKING); + if (status < 0) { + goto error; + } + } + + status = connect(sock, (struct sockaddr *) &sockaddr, + sizeof(sockaddr)); + if (status < 0) { + if (errno == EINPROGRESS) { + status = 0; + } else { + goto error; + } + } + if (async) { + /* + * Restore blocking mode. + */ + status = TclUnixSetBlockingMode(sock, TCL_MODE_BLOCKING); + } + } + + if (status < 0) { +error: + if (interp != NULL) { + Tcl_AppendResult(interp, "couldn't open socket: ", + Tcl_PosixError(interp), NULL); + if (errorMsg != NULL) { + Tcl_AppendResult(interp, " (", errorMsg, ")", NULL); + } + } + if (sock != -1) { + close(sock); + } + return NULL; + } + + /* + * Allocate a new TcpState for this socket. + */ + + statePtr = (TcpState *) ckalloc((unsigned) sizeof(TcpState)); + statePtr->flags = async ? TCP_ASYNC_CONNECT : 0; + statePtr->fd = sock; + + return statePtr; +} + +/* + *---------------------------------------------------------------------- + * + * 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( + struct sockaddr_in *sockaddrPtr, /* Socket address */ + const char *host, /* Host. NULL implies INADDR_ANY */ + int port, /* Port number */ + int willBind, /* Is this an address to bind() to or + * to connect() to? */ + const char **errorMsgPtr) /* Place to store the error message + * detail, if available. */ +{ +#ifdef HAVE_GETADDRINFO + struct addrinfo hints, *resPtr = NULL; + char *native; + Tcl_DString ds; + int result; + + if (host == NULL) { + sockaddrPtr->sin_family = AF_INET; + sockaddrPtr->sin_addr.s_addr = INADDR_ANY; + addPort: + sockaddrPtr->sin_port = htons((unsigned short) (port & 0xFFFF)); + return 1; + } + + (void) memset(&hints, 0, sizeof(struct addrinfo)); + hints.ai_family = AF_INET; + hints.ai_socktype = SOCK_STREAM; + if (willBind) { + hints.ai_flags |= AI_PASSIVE; + } + + /* + * Note that getaddrinfo() *is* thread-safe. If a platform doesn't get + * that right, it shouldn't use this part of the code. + */ + + native = Tcl_UtfToExternalDString(NULL, host, -1, &ds); + result = getaddrinfo(native, NULL, &hints, &resPtr); + Tcl_DStringFree(&ds); + if (result == 0) { + memcpy(sockaddrPtr, resPtr->ai_addr, sizeof(struct sockaddr_in)); + freeaddrinfo(resPtr); + goto addPort; + } + + /* + * Ought to use gai_strerror() here... + */ + + switch (result) { + case EAI_NONAME: + case EAI_SERVICE: +#if defined(EAI_ADDRFAMILY) && EAI_ADDRFAMILY != EAI_NONAME + case EAI_ADDRFAMILY: +#endif +#if defined(EAI_NODATA) && EAI_NODATA != EAI_NONAME + case EAI_NODATA: +#endif + *errorMsgPtr = gai_strerror(result); + errno = EHOSTUNREACH; + return 0; + case EAI_SYSTEM: + return 0; + default: + *errorMsgPtr = gai_strerror(result); + errno = ENXIO; + return 0; + } +#else /* !HAVE_GETADDRINFO */ + struct in_addr addr; /* For 64/32 bit madness */ + + (void) memset(sockaddrPtr, '\0', sizeof(struct sockaddr_in)); + sockaddrPtr->sin_family = AF_INET; + sockaddrPtr->sin_port = htons((unsigned short) (port & 0xFFFF)); + if (host == NULL) { + addr.s_addr = INADDR_ANY; + } else { + struct hostent *hostent; /* Host database entry */ + Tcl_DString ds; + const char *native; + + if (host == NULL) { + native = NULL; + } else { + native = Tcl_UtfToExternalDString(NULL, host, -1, &ds); + } + addr.s_addr = inet_addr(native); /* INTL: Native. */ + + /* + * This is 0xFFFFFFFF to ensure that it compares as a 32bit -1 on + * either 32 or 64 bits systems. + */ + + if (addr.s_addr == 0xFFFFFFFF) { + hostent = TclpGetHostByName(native); /* INTL: Native. */ + if (hostent != NULL) { + memcpy(&addr, hostent->h_addr_list[0], + (size_t) hostent->h_length); + } else { +#ifdef EHOSTUNREACH + errno = EHOSTUNREACH; +#else /* !EHOSTUNREACH */ +#ifdef ENXIO + errno = ENXIO; +#endif /* ENXIO */ +#endif /* EHOSTUNREACH */ + if (native != NULL) { + Tcl_DStringFree(&ds); + } + return 0; /* Error. */ + } + } + if (native != NULL) { + Tcl_DStringFree(&ds); + } + } + + /* + * 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. */ +#endif /* HAVE_GETADDRINFO */ +} + +/* + *---------------------------------------------------------------------- + * + * 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( + Tcl_Interp *interp, /* For error reporting; can be NULL. */ + int port, /* Port number to open. */ + const char *host, /* Host on which to open port. */ + const char *myaddr, /* Client-side address */ + int myport, /* Client-side port */ + int async) /* If nonzero, attempt to do an asynchronous + * connect. Otherwise we do a blocking + * connect. */ +{ + TcpState *statePtr; + char channelName[16 + TCL_INTEGER_SPACE]; + + /* + * Create a new client socket and wrap it in a channel. + */ + + statePtr = CreateSocket(interp, port, host, 0, myaddr, myport, async); + if (statePtr == NULL) { + return NULL; + } + + statePtr->acceptProc = NULL; + statePtr->acceptProcData = NULL; + + sprintf(channelName, "sock%d", statePtr->fd); + + statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName, + (ClientData) statePtr, (TCL_READABLE | TCL_WRITABLE)); + if (Tcl_SetChannelOption(interp, statePtr->channel, "-translation", + "auto crlf") == TCL_ERROR) { + Tcl_Close(NULL, statePtr->channel); + return NULL; + } + return statePtr->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. + * + *---------------------------------------------------------------------- + */ + +Tcl_Channel +Tcl_MakeTcpClientChannel( + ClientData sock) /* The socket to wrap up into a channel. */ +{ + return TclpMakeTcpClientChannelMode(sock, (TCL_READABLE | TCL_WRITABLE)); +} + +/* + *---------------------------------------------------------------------- + * + * TclpMakeTcpClientChannelMode -- + * + * Creates a Tcl_Channel from an existing client TCP socket + * with given mode. + * + * Results: + * The Tcl_Channel wrapped around the preexisting TCP socket. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +Tcl_Channel +TclpMakeTcpClientChannelMode( + ClientData sock, /* The socket to wrap up into a channel. */ + int mode) /* ORed combination of TCL_READABLE and + * TCL_WRITABLE to indicate file mode. */ +{ + TcpState *statePtr; + char channelName[16 + TCL_INTEGER_SPACE]; + + statePtr = (TcpState *) ckalloc((unsigned) sizeof(TcpState)); + statePtr->fd = PTR2INT(sock); + statePtr->flags = 0; + statePtr->acceptProc = NULL; + statePtr->acceptProcData = NULL; + + sprintf(channelName, "sock%d", statePtr->fd); + + statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName, + (ClientData) statePtr, mode); + if (Tcl_SetChannelOption(NULL, statePtr->channel, "-translation", + "auto crlf") == TCL_ERROR) { + Tcl_Close(NULL, statePtr->channel); + return NULL; + } + return statePtr->channel; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_OpenTcpServer -- + * + * Opens a TCP server socket and creates a channel around it. + * + * Results: + * The channel or NULL if failed. If an error occurred, an error message + * is left in the interp's result if interp is not NULL. + * + * Side effects: + * Opens a server socket and creates a new channel. + * + *---------------------------------------------------------------------- + */ + +Tcl_Channel +Tcl_OpenTcpServer( + Tcl_Interp *interp, /* For error reporting - may be NULL. */ + int port, /* Port number to open. */ + const char *myHost, /* Name of local host. */ + Tcl_TcpAcceptProc *acceptProc, + /* Callback for accepting connections from new + * clients. */ + ClientData acceptProcData) /* Data for the callback. */ +{ + TcpState *statePtr; + char channelName[16 + TCL_INTEGER_SPACE]; + + /* + * Create a new client socket and wrap it in a channel. + */ + + statePtr = CreateSocket(interp, port, myHost, 1, NULL, 0, 0); + if (statePtr == NULL) { + return NULL; + } + + statePtr->acceptProc = acceptProc; + statePtr->acceptProcData = acceptProcData; + + /* + * Set up the callback mechanism for accepting connections from new + * clients. + */ + + Tcl_CreateFileHandler(statePtr->fd, TCL_READABLE, TcpAccept, + (ClientData) statePtr); + sprintf(channelName, "sock%d", statePtr->fd); + statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName, + (ClientData) statePtr, 0); + return statePtr->channel; +} + +/* + *---------------------------------------------------------------------- + * + * TcpAccept -- + * Accept a TCP socket connection. This is called by the event loop. + * + * Results: + * None. + * + * Side effects: + * Creates a new connection socket. Calls the registered callback for the + * connection acceptance mechanism. + * + *---------------------------------------------------------------------- + */ + + /* ARGSUSED */ +static void +TcpAccept( + ClientData data, /* Callback token. */ + int mask) /* Not used. */ +{ + TcpState *sockState; /* Client data of server socket. */ + int newsock; /* The new client socket */ + TcpState *newSockState; /* State for new socket. */ + struct sockaddr_in addr; /* The remote address */ + socklen_t len; /* For accept interface */ + char channelName[16 + TCL_INTEGER_SPACE]; + + sockState = (TcpState *) data; + + len = sizeof(struct sockaddr_in); + newsock = accept(sockState->fd, (struct sockaddr *) &addr, &len); + if (newsock < 0) { + return; + } + + /* + * Set close-on-exec flag to prevent the newly accepted socket from being + * inherited by child processes. + */ + + (void) fcntl(newsock, F_SETFD, FD_CLOEXEC); + + newSockState = (TcpState *) ckalloc((unsigned) sizeof(TcpState)); + + newSockState->flags = 0; + newSockState->fd = newsock; + newSockState->acceptProc = NULL; + newSockState->acceptProcData = NULL; + + sprintf(channelName, "sock%d", newsock); + newSockState->channel = Tcl_CreateChannel(&tcpChannelType, channelName, + (ClientData) newSockState, (TCL_READABLE | TCL_WRITABLE)); + + Tcl_SetChannelOption(NULL, newSockState->channel, "-translation", + "auto crlf"); + + if (sockState->acceptProc != NULL) { + sockState->acceptProc(sockState->acceptProcData, + newSockState->channel, inet_ntoa(addr.sin_addr), + ntohs(addr.sin_port)); + } +} + +/* * Local Variables: * mode: c * c-basic-offset: 4 |