diff options
Diffstat (limited to 'unix/tclUnixSock.c')
| -rw-r--r-- | unix/tclUnixSock.c | 1085 |
1 files changed, 622 insertions, 463 deletions
diff --git a/unix/tclUnixSock.c b/unix/tclUnixSock.c index f5b9be4..31daa62 100644 --- a/unix/tclUnixSock.c +++ b/unix/tclUnixSock.c @@ -5,10 +5,8 @@ * * Copyright (c) 1995 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: tclUnixSock.c,v 1.26 2010/06/21 11:23:23 nijtmans Exp $ + * See the file "license.terms" for information on usage and redistribution of + * this file, and for a DISCLAIMER OF ALL WARRANTIES. */ #include "tclInt.h" @@ -22,19 +20,62 @@ #define SET_BITS(var, bits) ((var) |= (bits)) #define CLEAR_BITS(var, bits) ((var) &= ~(bits)) +/* "sock" + a pointer in hex + \0 */ +#define SOCK_CHAN_LENGTH (4 + sizeof(void *) * 2 + 1) +#define SOCK_TEMPLATE "sock%lx" + +#undef SOCKET /* Possible conflict with win32 SOCKET */ + +/* + * This is needed to comply with the strict aliasing rules of GCC, but it also + * simplifies casting between the different sockaddr types. + */ + +typedef union { + struct sockaddr sa; + struct sockaddr_in sa4; + struct sockaddr_in6 sa6; + struct sockaddr_storage sas; +} address; + /* * This structure describes per-instance state of a tcp based channel. */ -typedef struct TcpState { +typedef struct TcpState TcpState; + +typedef struct TcpFdList { + TcpState *statePtr; + int fd; + struct TcpFdList *next; +} TcpFdList; + +struct TcpState { Tcl_Channel channel; /* Channel associated with this file. */ - int fd; /* The socket itself. */ + TcpFdList fds; /* The file descriptors of the sockets. */ int flags; /* ORed combination of the bitfields defined * below. */ + /* + * Only needed for server sockets + */ + Tcl_TcpAcceptProc *acceptProc; - /* Proc to call on accept. */ - ClientData acceptProcData; /* The data for the accept proc. */ -} TcpState; + /* Proc to call on accept. */ + ClientData acceptProcData; /* The data for the accept proc. */ + + /* + * Only needed for client sockets + */ + + struct addrinfo *addrlist; /* Addresses to connect to. */ + struct addrinfo *addr; /* Iterator over addrlist. */ + struct addrinfo *myaddrlist;/* Local address. */ + struct addrinfo *myaddr; /* Iterator over myaddrlist. */ + int filehandlers; /* Caches FileHandlers that get set up while + * an async socket is not yet connected. */ + int status; /* Cache status of async socket. */ + int cachedBlocking; /* Cache blocking mode of async socket. */ +}; /* * These bits may be ORed together into the "flags" field of a TcpState @@ -53,9 +94,7 @@ typedef struct TcpState { #ifndef SOMAXCONN # define SOMAXCONN 100 -#endif /* SOMAXCONN */ - -#if (SOMAXCONN < 100) +#elif (SOMAXCONN < 100) # undef SOMAXCONN # define SOMAXCONN 100 #endif /* SOMAXCONN < 100 */ @@ -71,19 +110,14 @@ typedef struct TcpState { * 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 CreateClientSocket(Tcl_Interp *interp, + TcpState *state); 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); + Tcl_Interp *interp, int flags); static int TcpGetHandleProc(ClientData instanceData, int direction, ClientData *handlePtr); static int TcpGetOptionProc(ClientData instanceData, @@ -95,6 +129,7 @@ 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: @@ -120,7 +155,6 @@ static const Tcl_ChannelType tcpChannelType = { NULL /* truncate proc. */ }; - /* * The following variable holds the network name of this host. */ @@ -128,7 +162,6 @@ static const Tcl_ChannelType tcpChannelType = { static TclInitProcessGlobalValueProc InitializeHostName; static ProcessGlobalValue hostName = {0, 0, NULL, NULL, InitializeHostName, NULL, NULL}; - /* *---------------------------------------------------------------------- @@ -169,7 +202,7 @@ InitializeHostName( char *dot = strchr(u.nodename, '.'); if (dot != NULL) { - char *node = ckalloc((unsigned) (dot - u.nodename + 1)); + char *node = ckalloc(dot - u.nodename + 1); memcpy(node, u.nodename, (size_t) (dot - u.nodename)); node[dot - u.nodename] = '\0'; @@ -186,7 +219,7 @@ InitializeHostName( if (native == NULL) { native = tclEmptyStringRep; } -#else +#else /* !NO_UNAME */ /* * Uname doesn't exist; try gethostname instead. * @@ -211,11 +244,11 @@ InitializeHostName( if (gethostname(buffer, sizeof(buffer)) > -1) { /* INTL: Native. */ native = buffer; } -#endif +#endif /* NO_UNAME */ *encodingPtr = Tcl_GetEncoding(NULL, NULL); *lengthPtr = strlen(native); - *valuePtr = ckalloc((unsigned) (*lengthPtr) + 1); + *valuePtr = ckalloc((*lengthPtr) + 1); memcpy(*valuePtr, native, (size_t)(*lengthPtr)+1); } @@ -313,14 +346,18 @@ TcpBlockModeProc( * TCL_MODE_BLOCKING or * TCL_MODE_NONBLOCKING. */ { - TcpState *statePtr = (TcpState *) instanceData; + TcpState *statePtr = 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) { + if (statePtr->flags & TCP_ASYNC_CONNECT) { + statePtr->cachedBlocking = mode; + return 0; + } + if (TclUnixSetBlockingMode(statePtr->fds.fd, mode) < 0) { return errno; } return 0; @@ -362,7 +399,7 @@ WaitForConnect( timeOut = -1; } errno = 0; - state = TclUnixWaitForFile(statePtr->fd, + state = TclUnixWaitForFile(statePtr->fds.fd, TCL_WRITABLE | TCL_EXCEPTION, timeOut); if (state & TCL_EXCEPTION) { return -1; @@ -408,14 +445,14 @@ TcpInputProc( * buffer? */ int *errorCodePtr) /* Where to store error code. */ { - TcpState *statePtr = (TcpState *) instanceData; + TcpState *statePtr = instanceData; int bytesRead; *errorCodePtr = 0; if (WaitForConnect(statePtr, errorCodePtr) != 0) { return -1; } - bytesRead = recv(statePtr->fd, buf, (size_t) bufSize, 0); + bytesRead = recv(statePtr->fds.fd, buf, (size_t) bufSize, 0); if (bytesRead > -1) { return bytesRead; } @@ -458,14 +495,14 @@ TcpOutputProc( int toWrite, /* How many bytes to write? */ int *errorCodePtr) /* Where to store error code. */ { - TcpState *statePtr = (TcpState *) instanceData; + TcpState *statePtr = instanceData; int written; *errorCodePtr = 0; if (WaitForConnect(statePtr, errorCodePtr) != 0) { return -1; } - written = send(statePtr->fd, buf, (size_t) toWrite, 0); + written = send(statePtr->fds.fd, buf, (size_t) toWrite, 0); if (written > -1) { return written; } @@ -497,8 +534,9 @@ TcpCloseProc( ClientData instanceData, /* The socket to close. */ Tcl_Interp *interp) /* For error reporting - unused. */ { - TcpState *statePtr = (TcpState *) instanceData; + TcpState *statePtr = instanceData; int errorCode = 0; + TcpFdList *fds; /* * Delete a file handler that may be active for this socket if this is a @@ -507,14 +545,30 @@ TcpCloseProc( * 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; + + for (fds = &statePtr->fds; fds != NULL; fds = fds->next) { + if (fds->fd < 0) { + continue; + } + Tcl_DeleteFileHandler(fds->fd); + if (close(fds->fd) < 0) { + errorCode = errno; + } + } - ckfree((char *) statePtr); - + fds = statePtr->fds.next; + while (fds != NULL) { + TcpFdList *next = fds->next; + ckfree(fds); + fds = next; + } + if (statePtr->addrlist != NULL) { + freeaddrinfo(statePtr->addrlist); + } + if (statePtr->myaddrlist != NULL) { + freeaddrinfo(statePtr->myaddrlist); + } + ckfree(statePtr); return errorCode; } @@ -541,28 +595,29 @@ TcpClose2Proc( Tcl_Interp *interp, /* For error reporting. */ int flags) /* Flags that indicate which side to close. */ { - TcpState *statePtr = (TcpState *) instanceData; + TcpState *statePtr = 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) { + + switch(flags) { + case TCL_CLOSE_READ: + sd = SHUT_RD; + break; + case TCL_CLOSE_WRITE: + sd = SHUT_WR; + break; + default: + if (interp) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "socket close2proc called bidirectionally", -1)); + } + return TCL_ERROR; + } + if (shutdown(statePtr->fds.fd,sd) < 0) { errorCode = errno; } @@ -572,6 +627,74 @@ TcpClose2Proc( /* *---------------------------------------------------------------------- * + * TcpHostPortList -- + * + * This function is called by the -gethostname and -getpeername + * switches of TcpGetOptionProc() to add three list elements + * with the textual representation of the given address to the + * given DString. + * + * Results: + * None. + * + * Side effects: + * Adds three elements do dsPtr + * + *---------------------------------------------------------------------- + */ +static void +TcpHostPortList( + Tcl_Interp *interp, + Tcl_DString *dsPtr, + address addr, + socklen_t salen) +{ +#define SUPPRESS_RDNS_VAR "::tcl::unsupported::noReverseDNS" + char host[NI_MAXHOST], nhost[NI_MAXHOST], nport[NI_MAXSERV]; + int flags = 0; + + getnameinfo(&addr.sa, salen, + nhost, sizeof(nhost), nport, sizeof(nport), + NI_NUMERICHOST | NI_NUMERICSERV); + Tcl_DStringAppendElement(dsPtr, nhost); + /* + * We don't want to resolve INADDR_ANY and sin6addr_any; they + * can sometimes cause problems (and never have a name). + */ + if (addr.sa.sa_family == AF_INET) { + if (addr.sa4.sin_addr.s_addr == INADDR_ANY) { + flags |= NI_NUMERICHOST; + } +#ifndef NEED_FAKE_RFC2553 + } else if (addr.sa.sa_family == AF_INET6) { + if ((IN6_ARE_ADDR_EQUAL(&addr.sa6.sin6_addr, + &in6addr_any)) + || (IN6_IS_ADDR_V4MAPPED(&addr.sa6.sin6_addr) && + addr.sa6.sin6_addr.s6_addr[12] == 0 && + addr.sa6.sin6_addr.s6_addr[13] == 0 && + addr.sa6.sin6_addr.s6_addr[14] == 0 && + addr.sa6.sin6_addr.s6_addr[15] == 0)) { + flags |= NI_NUMERICHOST; + } +#endif /* NEED_FAKE_RFC2553 */ + } + /* Check if reverse DNS has been switched off globally */ + if (interp != NULL && Tcl_GetVar(interp, SUPPRESS_RDNS_VAR, 0) != NULL) { + flags |= NI_NUMERICHOST; + } + if (getnameinfo(&addr.sa, salen, host, sizeof(host), NULL, 0, flags) == 0) { + /* Reverse mapping worked */ + Tcl_DStringAppendElement(dsPtr, host); + } else { + /* Reverse mappong failed - use the numeric rep once more */ + Tcl_DStringAppendElement(dsPtr, nhost); + } + Tcl_DStringAppendElement(dsPtr, nport); +} + +/* + *---------------------------------------------------------------------- + * * TcpGetOptionProc -- * * Computes an option value for a TCP socket based channel, or a list of @@ -600,13 +723,8 @@ TcpGetOptionProc( 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); + TcpState *statePtr = instanceData; size_t len = 0; - char buf[TCL_INTEGER_SPACE]; if (optionName != NULL) { len = strlen(optionName); @@ -617,46 +735,37 @@ TcpGetOptionProc( 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 (statePtr->status == 0) { + ret = getsockopt(statePtr->fds.fd, SOL_SOCKET, SO_ERROR, + (char *) &err, &optlen); + if (ret < 0) { + err = errno; + } + } else { + err = statePtr->status; + statePtr->status = 0; + } 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) || ((len > 1) && (optionName[1] == 'p') && + (strncmp(optionName, "-peername", len) == 0))) { + address peername; + socklen_t size = sizeof(peername); + + if (getpeername(statePtr->fds.fd, &peername.sa, &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; - } + TcpHostPortList(interp, dsPtr, peername, size); + if (len) { + return TCL_OK; + } + Tcl_DStringEndSublist(dsPtr); } else { /* * getpeername failed - but if we were asked for all the options @@ -667,57 +776,43 @@ TcpGetOptionProc( if (len) { if (interp) { - Tcl_AppendResult(interp, "can't get peername: ", - Tcl_PosixError(interp), NULL); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "can't get peername: %s", + Tcl_PosixError(interp))); } return TCL_ERROR; } } } - if ((len == 0) || - ((len > 1) && (optionName[1] == 's') && + 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); + TcpFdList *fds; + address sockname; + socklen_t size; + int found = 0; + + if (len == 0) { + Tcl_DStringAppendElement(dsPtr, "-sockname"); + Tcl_DStringStartSublist(dsPtr); + } + for (fds = &statePtr->fds; fds != NULL; fds = fds->next) { + size = sizeof(sockname); + if (getsockname(fds->fd, &(sockname.sa), &size) >= 0) { + found = 1; + TcpHostPortList(interp, dsPtr, sockname, size); } - Tcl_DStringAppendElement(dsPtr, inet_ntoa(sockname.sin_addr)); - if (sockname.sin_addr.s_addr == INADDR_ANY) { - /* - * We don't want to resolve INADDR_ANY; it can sometimes cause - * problems (and never has a name). - */ - - hostEntPtr = NULL; - } else { - hostEntPtr = TclpGetHostByAddr( /* INTL: Native. */ - (char *) &sockname.sin_addr, - sizeof(sockname.sin_addr), AF_INET); + } + if (found) { + if (len) { + return TCL_OK; + } + Tcl_DStringEndSublist(dsPtr); + } else { + if (interp) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "can't get sockname: %s", Tcl_PosixError(interp))); } - 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; } } @@ -753,22 +848,26 @@ TcpWatchProc( * 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); - } + TcpState *statePtr = instanceData; + + if (statePtr->acceptProc != NULL) { + /* + * 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 (bug #3394732). + */ + return; + } + + if (statePtr->flags & TCP_ASYNC_CONNECT) { + /* Async sockets use a FileHandler internally while connecting, so we + * need to cache this request until the connection has succeeded. */ + statePtr->filehandlers = mask; + } else if (mask) { + Tcl_CreateFileHandler(statePtr->fds.fd, mask, + (Tcl_FileProc *) Tcl_NotifyChannel, statePtr->channel); + } else { + Tcl_DeleteFileHandler(statePtr->fds.fd); } } @@ -797,304 +896,209 @@ TcpGetHandleProc( int direction, /* Not used. */ ClientData *handlePtr) /* Where to store the handle. */ { - TcpState *statePtr = (TcpState *) instanceData; + TcpState *statePtr = instanceData; - *handlePtr = INT2PTR(statePtr->fd); + *handlePtr = INT2PTR(statePtr->fds.fd); return TCL_OK; } /* *---------------------------------------------------------------------- * - * CreateSocket -- - * - * This function opens a new socket in client or server mode and - * initializes the TcpState structure. + * TcpAsyncCallback -- * - * 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. + * Called by the event handler that CreateClientSocket sets up + * internally for [socket -async] to get notified when the + * asyncronous connection attempt has succeeded or failed. * *---------------------------------------------------------------------- */ - -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. */ +static void +TcpAsyncCallback( + ClientData clientData, /* The socket state. */ + int mask) /* Events of interest; an OR-ed combination of + * TCL_READABLE, TCL_WRITABLE and + * TCL_EXCEPTION. */ { - 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; + CreateClientSocket(NULL, clientData); } /* *---------------------------------------------------------------------- * - * CreateSocketAddress -- + * CreateClientSocket -- * - * This function initializes a sockaddr structure for a host and port. + * This function opens a new socket in client mode. * * Results: - * 1 if the host was valid, 0 if the host could not be converted to an IP - * address. + * TCL_OK, if the socket was successfully connected or an asynchronous + * connection is in progress. If an error occurs, TCL_ERROR is returned + * and an error message is left in interp. * * Side effects: - * Fills in the *sockaddrPtr structure. + * Opens a socket. + * + * Remarks: + * A single host name may resolve to more than one IP address, e.g. for + * an IPv4/IPv6 dual stack host. For handling asyncronously connecting + * sockets in the background for such hosts, this function can act as a + * coroutine. On the first call, it sets up the control variables for the + * two nested loops over the local and remote addresses. Once the first + * connection attempt is in progress, it sets up itself as a writable + * event handler for that socket, and returns. When the callback occurs, + * control is transferred to the "reenter" label, right after the initial + * return and the loops resume as if they had never been interrupted. + * For syncronously connecting sockets, the loops work the usual way. * *---------------------------------------------------------------------- */ 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. */ +CreateClientSocket( + Tcl_Interp *interp, /* For error reporting; can be NULL. */ + TcpState *state) { -#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; - } + socklen_t optlen; + int async_callback = (state->addr != NULL); + int status; + int async = state->flags & TCP_ASYNC_CONNECT; - (void) memset(&hints, 0, sizeof(struct addrinfo)); - hints.ai_family = AF_INET; - hints.ai_socktype = SOCK_STREAM; - if (willBind) { - hints.ai_flags |= AI_PASSIVE; + if (async_callback) { + goto reenter; } - /* - * Note that getaddrinfo() *is* thread-safe. If a platform doesn't get - * that right, it shouldn't use this part of the code. - */ + for (state->addr = state->addrlist; state->addr != NULL; + state->addr = state->addr->ai_next) { + status = -1; - 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; - } + for (state->myaddr = state->myaddrlist; state->myaddr != NULL; + state->myaddr = state->myaddr->ai_next) { + int reuseaddr; + + /* + * No need to try combinations of local and remote addresses of + * different families. + */ - /* - * Ought to use gai_strerror() here... - */ + if (state->myaddr->ai_family != state->addr->ai_family) { + continue; + } - 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; + /* + * Close the socket if it is still open from the last unsuccessful + * iteration. + */ - if (host == NULL) { - native = NULL; - } else { - native = Tcl_UtfToExternalDString(NULL, host, -1, &ds); - } - addr.s_addr = inet_addr(native); /* INTL: Native. */ + if (state->fds.fd >= 0) { + close(state->fds.fd); + state->fds.fd = -1; + } - /* - * This is 0xFFFFFFFF to ensure that it compares as a 32bit -1 on - * either 32 or 64 bits systems. - */ + state->fds.fd = socket(state->addr->ai_family, SOCK_STREAM, 0); + if (state->fds.fd < 0) { + continue; + } - 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); + /* + * Set the close-on-exec flag so that the socket will not get + * inherited by child processes. + */ + + fcntl(state->fds.fd, F_SETFD, FD_CLOEXEC); + + /* + * Set kernel space buffering + */ + + TclSockMinimumBuffers(INT2PTR(state->fds.fd), SOCKET_BUFSIZE); + + if (async) { + status = TclUnixSetBlockingMode(state->fds.fd, + TCL_MODE_NONBLOCKING); + if (status < 0) { + continue; } - return 0; /* Error. */ } - } - if (native != NULL) { - Tcl_DStringFree(&ds); + + reuseaddr = 1; + (void) setsockopt(state->fds.fd, SOL_SOCKET, SO_REUSEADDR, + (char *) &reuseaddr, sizeof(reuseaddr)); + status = bind(state->fds.fd, state->myaddr->ai_addr, + state->myaddr->ai_addrlen); + if (status < 0) { + continue; + } + + /* + * 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. + */ + + status = connect(state->fds.fd, state->addr->ai_addr, + state->addr->ai_addrlen); + if (status < 0 && errno == EINPROGRESS) { + Tcl_CreateFileHandler(state->fds.fd, + TCL_WRITABLE|TCL_EXCEPTION, TcpAsyncCallback, state); + return TCL_OK; + + reenter: + Tcl_DeleteFileHandler(state->fds.fd); + + /* + * Read the error state from the socket to see if the async + * connection has succeeded or failed. As this clears the + * error condition, we cache the status in the socket state + * struct for later retrieval by [fconfigure -error]. + */ + + optlen = sizeof(int); + getsockopt(state->fds.fd, SOL_SOCKET, SO_ERROR, + (char *) &status, &optlen); + state->status = status; + } + if (status == 0) { + CLEAR_BITS(state->flags, TCP_ASYNC_CONNECT); + goto out; + } } } - /* - * 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 */ +out: + + if (async_callback) { + /* + * An asynchonous connection has finally succeeded or failed. + */ + + TcpWatchProc(state, state->filehandlers); + TclUnixSetBlockingMode(state->fds.fd, state->cachedBlocking); + + /* + * We need to forward the writable event that brought us here, bcasue + * upon reading of getsockopt(SO_ERROR), at least some OSes clear the + * writable state from the socket, and so a subsequent select() on + * behalf of a script level [fileevent] would not fire. It doesn't + * hurt that this is also called in the successful case and will save + * the event mechanism one roundtrip through select(). + */ + + Tcl_NotifyChannel(state->channel, TCL_WRITABLE); + } else if (status != 0) { + /* + * Failure for either a synchronous connection, or an async one that + * failed before it could enter background mode, e.g. because an + * invalid -myaddr was given. + */ + + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "couldn't open socket: %s", Tcl_PosixError(interp))); + } + return TCL_ERROR; + } + return TCL_OK; } /* @@ -1125,31 +1129,57 @@ Tcl_OpenTcpClient( * connect. Otherwise we do a blocking * connect. */ { - TcpState *statePtr; - char channelName[16 + TCL_INTEGER_SPACE]; + TcpState *state; + const char *errorMsg = NULL; + struct addrinfo *addrlist = NULL, *myaddrlist = NULL; + char channelName[SOCK_CHAN_LENGTH]; /* - * Create a new client socket and wrap it in a channel. + * Do the name lookups for the local and remote addresses. */ - statePtr = CreateSocket(interp, port, host, 0, myaddr, myport, async); - if (statePtr == NULL) { - return NULL; + if (!TclCreateSocketAddress(interp, &addrlist, host, port, 0, &errorMsg) + || !TclCreateSocketAddress(interp, &myaddrlist, myaddr, myport, 1, + &errorMsg)) { + if (addrlist != NULL) { + freeaddrinfo(addrlist); + } + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "couldn't open socket: %s", errorMsg)); + } + return NULL; } - statePtr->acceptProc = NULL; - statePtr->acceptProcData = NULL; + /* + * Allocate a new TcpState for this socket. + */ + state = ckalloc(sizeof(TcpState)); + memset(state, 0, sizeof(TcpState)); + state->flags = async ? TCP_ASYNC_CONNECT : 0; + state->cachedBlocking = TCL_MODE_BLOCKING; + state->addrlist = addrlist; + state->myaddrlist = myaddrlist; + state->fds.fd = -1; - sprintf(channelName, "sock%d", statePtr->fd); + /* + * Create a new client socket and wrap it in a channel. + */ + if (CreateClientSocket(interp, state) != TCL_OK) { + TcpCloseProc(state, NULL); + return NULL; + } - statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName, - statePtr, (TCL_READABLE | TCL_WRITABLE)); - if (Tcl_SetChannelOption(interp, statePtr->channel, "-translation", + sprintf(channelName, SOCK_TEMPLATE, (long) state); + + state->channel = Tcl_CreateChannel(&tcpChannelType, channelName, state, + (TCL_READABLE | TCL_WRITABLE)); + if (Tcl_SetChannelOption(interp, state->channel, "-translation", "auto crlf") == TCL_ERROR) { - Tcl_Close(NULL, statePtr->channel); + Tcl_Close(NULL, state->channel); return NULL; } - return statePtr->channel; + return state->channel; } /* @@ -1199,15 +1229,14 @@ TclpMakeTcpClientChannelMode( * TCL_WRITABLE to indicate file mode. */ { TcpState *statePtr; - char channelName[16 + TCL_INTEGER_SPACE]; + char channelName[SOCK_CHAN_LENGTH]; - statePtr = (TcpState *) ckalloc((unsigned) sizeof(TcpState)); - statePtr->fd = PTR2INT(sock); + statePtr = ckalloc(sizeof(TcpState)); + memset(statePtr, 0, sizeof(TcpState)); + statePtr->fds.fd = PTR2INT(sock); statePtr->flags = 0; - statePtr->acceptProc = NULL; - statePtr->acceptProcData = NULL; - sprintf(channelName, "sock%d", statePtr->fd); + sprintf(channelName, SOCK_TEMPLATE, (long)statePtr); statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName, statePtr, mode); @@ -1246,32 +1275,164 @@ Tcl_OpenTcpServer( * clients. */ ClientData acceptProcData) /* Data for the callback. */ { - TcpState *statePtr; - char channelName[16 + TCL_INTEGER_SPACE]; + int status = 0, sock = -1, reuseaddr = 1, chosenport = 0; + struct addrinfo *addrlist = NULL, *addrPtr; /* socket address */ + TcpState *statePtr = NULL; + char channelName[SOCK_CHAN_LENGTH]; + const char *errorMsg = NULL; + TcpFdList *fds = NULL, *newfds; /* - * Create a new client socket and wrap it in a channel. + * Try to record and return the most meaningful error message, i.e. the + * one from the first socket that went the farthest before it failed. */ - statePtr = CreateSocket(interp, port, myHost, 1, NULL, 0, 0); - if (statePtr == NULL) { - return NULL; + enum { LOOKUP, SOCKET, BIND, LISTEN } howfar = LOOKUP; + int my_errno = 0; + + if (!TclCreateSocketAddress(interp, &addrlist, myHost, port, 1, &errorMsg)) { + my_errno = errno; + goto error; } - statePtr->acceptProc = acceptProc; - statePtr->acceptProcData = acceptProcData; + for (addrPtr = addrlist; addrPtr != NULL; addrPtr = addrPtr->ai_next) { + sock = socket(addrPtr->ai_family, addrPtr->ai_socktype, + addrPtr->ai_protocol); + if (sock == -1) { + if (howfar < SOCKET) { + howfar = SOCKET; + my_errno = errno; + } + continue; + } + + /* + * 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(INT2PTR(sock), SOCKET_BUFSIZE); + + /* + * Set up to reuse server addresses automatically and bind to the + * specified port. + */ + + (void) setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, + (char *) &reuseaddr, sizeof(reuseaddr)); + + /* + * Make sure we use the same port number when opening two server + * sockets for IPv4 and IPv6 on a random port. + * + * As sockaddr_in6 uses the same offset and size for the port member + * as sockaddr_in, we can handle both through the IPv4 API. + */ + + if (port == 0 && chosenport != 0) { + ((struct sockaddr_in *) addrPtr->ai_addr)->sin_port = + htons(chosenport); + } - /* - * Set up the callback mechanism for accepting connections from new - * clients. - */ +#ifdef IPV6_V6ONLY + /* Missing on: Solaris 2.8 */ + if (addrPtr->ai_family == AF_INET6) { + int v6only = 1; - Tcl_CreateFileHandler(statePtr->fd, TCL_READABLE, TcpAccept, - statePtr); - sprintf(channelName, "sock%d", statePtr->fd); - statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName, - statePtr, 0); - return statePtr->channel; + (void) setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, + &v6only, sizeof(v6only)); + } +#endif /* IPV6_V6ONLY */ + + status = bind(sock, addrPtr->ai_addr, addrPtr->ai_addrlen); + if (status == -1) { + if (howfar < BIND) { + howfar = BIND; + my_errno = errno; + } + close(sock); + continue; + } + if (port == 0 && chosenport == 0) { + address sockname; + socklen_t namelen = sizeof(sockname); + + /* + * Synchronize port numbers when binding to port 0 of multiple + * addresses. + */ + + if (getsockname(sock, &sockname.sa, &namelen) >= 0) { + chosenport = ntohs(sockname.sa4.sin_port); + } + } + status = listen(sock, SOMAXCONN); + if (status < 0) { + if (howfar < LISTEN) { + howfar = LISTEN; + my_errno = errno; + } + close(sock); + continue; + } + if (statePtr == NULL) { + /* + * Allocate a new TcpState for this socket. + */ + + statePtr = ckalloc(sizeof(TcpState)); + memset(statePtr, 0, sizeof(TcpState)); + statePtr->acceptProc = acceptProc; + statePtr->acceptProcData = acceptProcData; + sprintf(channelName, SOCK_TEMPLATE, (long) statePtr); + newfds = &statePtr->fds; + } else { + newfds = ckalloc(sizeof(TcpFdList)); + memset(newfds, (int) 0, sizeof(TcpFdList)); + fds->next = newfds; + } + newfds->fd = sock; + newfds->statePtr = statePtr; + fds = newfds; + + /* + * Set up the callback mechanism for accepting connections from new + * clients. + */ + + Tcl_CreateFileHandler(sock, TCL_READABLE, TcpAccept, fds); + } + + error: + if (addrlist != NULL) { + freeaddrinfo(addrlist); + } + if (statePtr != NULL) { + statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName, + statePtr, 0); + return statePtr->channel; + } + if (interp != NULL) { + Tcl_Obj *errorObj = Tcl_NewStringObj("couldn't open socket: ", -1); + + if (errorMsg == NULL) { + errno = my_errno; + Tcl_AppendToObj(errorObj, Tcl_PosixError(interp), -1); + } else { + Tcl_AppendToObj(errorObj, errorMsg, -1); + } + Tcl_SetObjResult(interp, errorObj); + } + if (sock != -1) { + close(sock); + } + return NULL; } /* @@ -1296,17 +1457,16 @@ TcpAccept( ClientData data, /* Callback token. */ int mask) /* Not used. */ { - TcpState *sockState; /* Client data of server socket. */ + TcpFdList *fds = data; /* Client data of server socket. */ int newsock; /* The new client socket */ TcpState *newSockState; /* State for new socket. */ - struct sockaddr_in addr; /* The remote address */ + address 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); + char channelName[SOCK_CHAN_LENGTH]; + char host[NI_MAXHOST], port[NI_MAXSERV]; + + len = sizeof(addr); + newsock = accept(fds->fd, &addr.sa, &len); if (newsock < 0) { return; } @@ -1318,24 +1478,23 @@ TcpAccept( (void) fcntl(newsock, F_SETFD, FD_CLOEXEC); - newSockState = (TcpState *) ckalloc((unsigned) sizeof(TcpState)); - + newSockState = ckalloc(sizeof(TcpState)); + memset(newSockState, 0, sizeof(TcpState)); newSockState->flags = 0; - newSockState->fd = newsock; - newSockState->acceptProc = NULL; - newSockState->acceptProcData = NULL; + newSockState->fds.fd = newsock; - sprintf(channelName, "sock%d", newsock); + sprintf(channelName, SOCK_TEMPLATE, (long) newSockState); newSockState->channel = Tcl_CreateChannel(&tcpChannelType, channelName, 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)); + if (fds->statePtr->acceptProc != NULL) { + getnameinfo(&addr.sa, len, host, sizeof(host), port, sizeof(port), + NI_NUMERICHOST|NI_NUMERICSERV); + fds->statePtr->acceptProc(fds->statePtr->acceptProcData, + newSockState->channel, host, atoi(port)); } } |