/*
* tclUnixSock.c --
*
* This file contains Unix-specific socket related code.
*
* 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.
*/
#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 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 TcpState;
typedef struct TcpFdList {
TcpState *statePtr;
int fd;
struct TcpFdList *next;
} TcpFdList;
struct TcpState {
Tcl_Channel channel; /* Channel associated with this file. */
TcpFdList *fds; /* The file descriptors of the sockets. */
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. */
};
/*
* 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 * CreateClientSocket(Tcl_Interp *interp, int port,
const char *host, const char *myaddr,
int myport, int async);
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 const 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.
*/
static TclInitProcessGlobalValueProc InitializeHostName;
static ProcessGlobalValue hostName =
{0, 0, NULL, NULL, InitializeHostName, NULL, NULL};
/*
*----------------------------------------------------------------------
*
* InitializeHostName --
*
* This routine sets the process global value of the name of the local
* host on which the process is running.
*
* Results:
* None.
*
*----------------------------------------------------------------------
*/
static void
InitializeHostName(
char **valuePtr,
int *lengthPtr,
Tcl_Encoding *encodingPtr)
{
const char *native = NULL;
#ifndef NO_UNAME
struct utsname u;
struct hostent *hp;
memset(&u, (int) 0, sizeof(struct utsname));
if (uname(&u) > -1) { /* INTL: Native. */
hp = TclpGetHostByName(u.nodename); /* INTL: Native. */
if (hp == NULL) {
/*
* Sometimes the nodename is fully qualified, but gets truncated
* as it exceeds SYS_NMLN. See if we can just get the immediate
* nodename and get a proper answer that way.
*/
char *dot = strchr(u.nodename, '.');
if (dot != NULL) {
char *node = ckalloc((unsigned) (dot - u.nodename + 1));
memcpy(node, u.nodename, (size_t) (dot - u.nodename));
node[dot - u.nodename] = '\0';
hp = TclpGetHostByName(node);
ckfree(node);
}
}
if (hp != NULL) {
native = hp->h_name;
} else {
native = u.nodename;
}
}
if (native == NULL) {
native = tclEmptyStringRep;
}
#else
/*
* Uname doesn't exist; try gethostname instead.
*
* There is no portable macro for the maximum length of host names
* returned by gethostbyname(). We should only trust SYS_NMLN if it is at
* least 255 + 1 bytes to comply with DNS host name limits.
*
* Note: SYS_NMLN is a restriction on "uname" not on gethostbyname!
*
* For example HP-UX 10.20 has SYS_NMLN == 9, while gethostbyname() can
* return a fully qualified name from DNS of up to 255 bytes.
*
* Fix suggested by Viktor Dukhovni (viktor@esm.com)
*/
# if defined(SYS_NMLN) && (SYS_NMLEN >= 256)
char buffer[SYS_NMLEN];
# else
char buffer[256];
# endif
if (gethostname(buffer, sizeof(buffer)) > -1) { /* INTL: Native. */
native = buffer;
}
#endif
*encodingPtr = Tcl_GetEncoding(NULL, NULL);
*lengthPtr = strlen(native);
*valuePtr = ckalloc((unsigned) (*lengthPtr) + 1);
memcpy(*valuePtr, native, (size_t)(*lengthPtr)+1);
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetHostName --
*
* Returns the name of the local host.
*
* Results:
* A string containing the network name for this machine, or an empty
* string if we can't figure out the name. The caller must not modify or
* free this string.
*
* Side effects:
* Caches the name to return for future calls.
*
*----------------------------------------------------------------------
*/
const char *
Tcl_GetHostName(void)
{
return Tcl_GetString(TclGetProcessGlobalValue(&hostName));
}
/*
*----------------------------------------------------------------------
*
* TclpHasSockets --
*
* Detect if sockets are available on this platform.
*
* Results:
* Returns TCL_OK.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TclpHasSockets(
Tcl_Interp *interp) /* Not used. */
{
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* TclpFinalizeSockets --
*
* Performs per-thread socket subsystem finalization.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TclpFinalizeSockets(void)
{
return;
}
/*
*----------------------------------------------------------------------
*
* 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->fds->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->fds->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->fds->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->fds->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;
TcpFdList *fds;
/*
* 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.
*/
for (fds = statePtr->fds; fds != NULL; fds = statePtr->fds) {
statePtr->fds = fds->next;
Tcl_DeleteFileHandler(fds->fd);
if (close(fds->fd) < 0) {
errorCode = errno;
}
ckfree((char *) fds);
}
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->fds->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;
char host[NI_MAXHOST], port[NI_MAXSERV];
size_t len = 0;
int reverseDNS = 0;
#define SUPPRESS_RDNS_VAR "::tcl::unsupported::noReverseDNS"
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->fds->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 (interp != NULL && Tcl_GetVar(interp, SUPPRESS_RDNS_VAR, 0) != NULL) {
reverseDNS = NI_NUMERICHOST;
}
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);
}
getnameinfo(&peername.sa, size, host, sizeof(host), NULL, 0,
NI_NUMERICHOST);
Tcl_DStringAppendElement(dsPtr, host);
getnameinfo(&peername.sa, size, host, sizeof(host), port,
sizeof(port), reverseDNS | NI_NUMERICSERV);
Tcl_DStringAppendElement(dsPtr, host);
Tcl_DStringAppendElement(dsPtr, port);
if (len) {
return TCL_OK;
}
Tcl_DStringEndSublist(dsPtr);
} 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))) {
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) {
int flags = reverseDNS;
found = 1;
getnameinfo(&sockname.sa, size, host, sizeof(host), NULL, 0,
NI_NUMERICHOST);
Tcl_DStringAppendElement(dsPtr, host);
/*
* We don't want to resolve INADDR_ANY and sin6addr_any; they
* can sometimes cause problems (and never have a name).
*/
flags |= NI_NUMERICSERV;
if (sockname.sa.sa_family == AF_INET) {
if (sockname.sa4.sin_addr.s_addr == INADDR_ANY) {
flags |= NI_NUMERICHOST;
}
#ifndef NEED_FAKE_RFC2553
} else if (sockname.sa.sa_family == AF_INET6) {
if ((IN6_ARE_ADDR_EQUAL(&sockname.sa6.sin6_addr,
&in6addr_any))
|| (IN6_IS_ADDR_V4MAPPED(&sockname.sa6.sin6_addr) &&
sockname.sa6.sin6_addr.s6_addr[12] == 0 &&
sockname.sa6.sin6_addr.s6_addr[13] == 0 &&
sockname.sa6.sin6_addr.s6_addr[14] == 0 &&
sockname.sa6.sin6_addr.s6_addr[15] == 0)) {
flags |= NI_NUMERICHOST;
}
#endif
}
getnameinfo(&sockname.sa, size, host, sizeof(host), port,
sizeof(port), flags);
Tcl_DStringAppendElement(dsPtr, host);
Tcl_DStringAppendElement(dsPtr, port);
}
}
if (found) {
if (len) {
return TCL_OK;
}
Tcl_DStringEndSublist(dsPtr);
} 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) {
TcpFdList *fds;
for (fds = statePtr->fds; fds != NULL; fds = fds->next) {
if (mask) {
Tcl_CreateFileHandler(fds->fd, mask,
(Tcl_FileProc *) Tcl_NotifyChannel,
(ClientData) statePtr->channel);
} else {
Tcl_DeleteFileHandler(fds->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 = INT2PTR(statePtr->fds->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 *
CreateClientSocket(
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. */
const char *myaddr, /* Optional client-side address.
* NULL implies INADDR_ANY/in6addr_any */
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 = -1, connected = 0, sock = -1;
struct addrinfo *addrlist = NULL, *addrPtr;
/* Socket address */
struct addrinfo *myaddrlist = NULL, *myaddrPtr;
/* Socket address for client */
TcpState *statePtr;
const char *errorMsg = NULL;
if (!TclCreateSocketAddress(interp, &addrlist, host, port, 0, &errorMsg)) {
goto error;
}
if (!TclCreateSocketAddress(interp, &myaddrlist, myaddr, myport, 1, &errorMsg)) {
goto error;
}
for (addrPtr = addrlist; addrPtr != NULL;
addrPtr = addrPtr->ai_next) {
for (myaddrPtr = myaddrlist; myaddrPtr != NULL;
myaddrPtr = myaddrPtr->ai_next) {
int reuseaddr;
/*
* No need to try combinations of local and remote addresses of
* different families.
*/
if (myaddrPtr->ai_family != addrPtr->ai_family) {
continue;
}
sock = socket(addrPtr->ai_family, SOCK_STREAM, 0);
if (sock < 0) {
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);
if (async) {
status = TclUnixSetBlockingMode(sock, TCL_MODE_NONBLOCKING);
if (status < 0) {
goto looperror;
}
}
reuseaddr = 1;
(void) setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
(char *) &reuseaddr, sizeof(reuseaddr));
status = bind(sock, myaddrPtr->ai_addr, myaddrPtr->ai_addrlen);
if (status < 0) {
goto looperror;
}
/*
* 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(sock, addrPtr->ai_addr, addrPtr->ai_addrlen);
if (status < 0 && errno == EINPROGRESS) {
status = 0;
}
if (status == 0) {
connected = 1;
break;
}
looperror:
if (sock != -1) {
close(sock);
sock = -1;
}
}
if (connected) {
break;
}
status = -1;
if (sock >= 0) {
close(sock);
sock = -1;
}
}
if (async) {
/*
* Restore blocking mode.
*/
status = TclUnixSetBlockingMode(sock, TCL_MODE_BLOCKING);
}
error:
if (addrlist) {
freeaddrinfo(addrlist);
}
if (myaddrlist) {
freeaddrinfo(myaddrlist);
}
if (status < 0) {
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->fds = (TcpFdList *) ckalloc((unsigned) sizeof(TcpFdList));
memset(statePtr->fds, (int) 0, sizeof(TcpFdList));
statePtr->fds->fd = sock;
return statePtr;
}
/*
*----------------------------------------------------------------------
*
* 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 = CreateClientSocket(interp, port, host, myaddr, myport, async);
if (statePtr == NULL) {
return NULL;
}
statePtr->acceptProc = NULL;
statePtr->acceptProcData = NULL;
sprintf(channelName, "sock%d", statePtr->fds->fd);
statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
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->fds = (TcpFdList *) ckalloc((unsigned) sizeof(TcpFdList));
memset(statePtr->fds, (int) 0, sizeof(TcpFdList));
statePtr->fds->fd = PTR2INT(sock);
statePtr->flags = 0;
statePtr->acceptProc = NULL;
statePtr->acceptProcData = NULL;
sprintf(channelName, "sock%d", statePtr->fds->fd);
statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
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. */
{
int status = 0, sock = -1, reuseaddr = 1, chosenport = 0;
struct addrinfo *addrlist = NULL, *addrPtr; /* socket address */
TcpState *statePtr = NULL;
char channelName[16 + TCL_INTEGER_SPACE];
const char *errorMsg = NULL;
TcpFdList *fds = NULL, *newfds;
if (!TclCreateSocketAddress(interp, &addrlist, myHost, port, 1, &errorMsg)) {
goto error;
}
for (addrPtr = addrlist; addrPtr != NULL; addrPtr = addrPtr->ai_next) {
sock = socket(addrPtr->ai_family, SOCK_STREAM, 0);
if (sock == -1) {
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);
}
#ifdef IPV6_V6ONLY
/* Missing on: Solaris 2.8 */
if (addrPtr->ai_family == AF_INET6) {
int v6only = 1;
(void) setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
&v6only, sizeof(v6only));
}
#endif
status = bind(sock, addrPtr->ai_addr, addrPtr->ai_addrlen);
if (status == -1) {
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) {
close(sock);
continue;
}
newfds = (TcpFdList *) ckalloc((unsigned) sizeof(TcpFdList));
memset(newfds, (int) 0, sizeof(TcpFdList));
if (statePtr == NULL) {
/*
* Allocate a new TcpState for this socket.
*/
statePtr = (TcpState *) ckalloc((unsigned) sizeof(TcpState));
statePtr->fds = newfds;
statePtr->acceptProc = acceptProc;
statePtr->acceptProcData = acceptProcData;
sprintf(channelName, "sock%d", sock);
} else {
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_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;
}
/*
*----------------------------------------------------------------------
*
* 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. */
{
TcpFdList *fds; /* Client data of server socket. */
int newsock; /* The new client socket */
TcpState *newSockState; /* State for new socket. */
address addr; /* The remote address */
socklen_t len; /* For accept interface */
char channelName[16 + TCL_INTEGER_SPACE];
char host[NI_MAXHOST], port[NI_MAXSERV];
fds = (TcpFdList *) data;
len = sizeof(addr);
newsock = accept(fds->fd, &(addr.sa), &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->fds = (TcpFdList *) ckalloc(sizeof(TcpFdList));
memset(newSockState->fds, (int) 0, sizeof(TcpFdList));
newSockState->fds->fd = newsock;
newSockState->acceptProc = NULL;
newSockState->acceptProcData = NULL;
sprintf(channelName, "sock%d", newsock);
newSockState->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
newSockState, (TCL_READABLE | TCL_WRITABLE));
Tcl_SetChannelOption(NULL, newSockState->channel, "-translation",
"auto crlf");
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));
}
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* tab-width: 8
* indent-tabs-mode: nil
* End:
*/