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Edit File: Xtranslcl.c

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documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* Copyright 1993, 1994 NCR Corporation - Dayton, Ohio, USA
 *
 * All Rights Reserved
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted, provided
 * that the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name NCR not be used in advertising
 * or publicity pertaining to distribution of the software without specific,
 * written prior permission.  NCR makes no representations about the
 * suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * NCR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
 * NO EVENT SHALL NCR BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*
 *
 * The connection code/ideas in lib/X and server/os for SVR4/Intel
 * environments was contributed by the following companies/groups:
 *
 *	MetroLink Inc
 *	NCR
 *	Pittsburgh Powercomputing Corporation (PPc)/Quarterdeck Office Systems
 *	SGCS
 *	Unix System Laboratories (USL) / Novell
 *	XFree86
 *
 * The goal is to have common connection code among all SVR4/Intel vendors.
 *
 * ALL THE ABOVE COMPANIES DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
 * IN NO EVENT SHALL THESE COMPANIES * BE LIABLE FOR ANY SPECIAL, INDIRECT
 * OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE
 * OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <errno.h>
#include <ctype.h>
#include <sys/signal.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#if defined(SVR4) || defined(__SVR4)
#include <sys/filio.h>
#endif
#ifdef __sun
# include <stropts.h>
#else
# include <sys/stropts.h>
#endif
#include <sys/wait.h>
#include <sys/types.h>

/*
 * The local transports should be treated the same as a UNIX domain socket
 * wrt authentication, etc. Because of this, we will use struct sockaddr_un
 * for the address format. This will simplify the code in other places like
 * The X Server.
 */

#include <sys/socket.h>
#ifndef X_NO_SYS_UN
#include <sys/un.h>
#endif

/* Types of local connections supported:
 *  - PTS
 *  - named pipes
 *  - SCO
 */
#if !defined(__sun)
# define LOCAL_TRANS_PTS
#endif
#if defined(SVR4) || defined(__SVR4)
# define LOCAL_TRANS_NAMED
#endif
#if defined(__SCO__) || defined(__UNIXWARE__)
# define LOCAL_TRANS_SCO
#endif

static int TRANS(LocalClose)(XtransConnInfo ciptr);

/*
 * These functions actually implement the local connection mechanisms.
 */

/* Type Not Supported */

static int
TRANS(OpenFail)(XtransConnInfo ciptr _X_UNUSED, const char *port _X_UNUSED)

{
    return -1;
}

#ifdef TRANS_REOPEN

static int
TRANS(ReopenFail)(XtransConnInfo ciptr _X_UNUSED, int fd _X_UNUSED,
                  const char *port _X_UNUSED)

{
    return 0;
}

#endif /* TRANS_REOPEN */

#if XTRANS_SEND_FDS
static int
TRANS(LocalRecvFdInvalid)(XtransConnInfo ciptr)
{
    errno = EINVAL;
    return -1;
}

static int
TRANS(LocalSendFdInvalid)(XtransConnInfo ciptr, int fd, int do_close)
{
    errno = EINVAL;
    return -1;
}
#endif

static int
TRANS(FillAddrInfo)(XtransConnInfo ciptr,
                    const char *sun_path, const char *peer_sun_path)

{
    struct sockaddr_un	*sunaddr;
    struct sockaddr_un	*p_sunaddr;

ciptr->family = AF_UNIX;
    ciptr->addrlen = sizeof (struct sockaddr_un);

if ((sunaddr = malloc (ciptr->addrlen)) == NULL)
    {
	prmsg(1,"FillAddrInfo: failed to allocate memory for addr\n");
	return 0;
    }

sunaddr->sun_family = AF_UNIX;

if (strlen(sun_path) > sizeof(sunaddr->sun_path) - 1) {
	prmsg(1, "FillAddrInfo: path too long\n");
	free((char *) sunaddr);
	return 0;
    }
    strcpy (sunaddr->sun_path, sun_path);
#if defined(BSD44SOCKETS)
    sunaddr->sun_len = strlen (sunaddr->sun_path);
#endif

ciptr->addr = (char *) sunaddr;

ciptr->peeraddrlen = sizeof (struct sockaddr_un);

if ((p_sunaddr = malloc (ciptr->peeraddrlen)) == NULL)
    {
	prmsg(1,
	   "FillAddrInfo: failed to allocate memory for peer addr\n");
	free (sunaddr);
	ciptr->addr = NULL;

return 0;
    }

p_sunaddr->sun_family = AF_UNIX;

if (strlen(peer_sun_path) > sizeof(p_sunaddr->sun_path) - 1) {
	prmsg(1, "FillAddrInfo: peer path too long\n");
	free((char *) p_sunaddr);
	return 0;
    }
    strcpy (p_sunaddr->sun_path, peer_sun_path);
#if defined(BSD44SOCKETS)
    p_sunaddr->sun_len = strlen (p_sunaddr->sun_path);
#endif

ciptr->peeraddr = (char *) p_sunaddr;

return 1;
}

#ifdef LOCAL_TRANS_PTS
/* PTS */

#if defined(SYSV) && !defined(__SCO__)
#define SIGNAL_T int
#else
#define SIGNAL_T void
#endif /* SYSV */

typedef SIGNAL_T (*PFV)();

extern PFV signal();

extern char *ptsname(
    int
);

static void _dummy(int sig _X_UNUSED)

{
}
#endif /* LOCAL_TRANS_PTS */

#ifndef __sun
#define X_STREAMS_DIR	"/dev/X"
#define DEV_SPX		"/dev/spx"
#else
#ifndef X11_t
#define X_STREAMS_DIR	"/dev/X"
#else
#define X_STREAMS_DIR	"/tmp/.X11-pipe"
#endif
#endif

#define DEV_PTMX	"/dev/ptmx"

#if defined(X11_t)

#define PTSNODENAME "/dev/X/server."
#ifdef __sun
#define NAMEDNODENAME "/tmp/.X11-pipe/X"
#else
#define NAMEDNODENAME "/dev/X/Nserver."

#define SCORNODENAME	"/dev/X%1sR"
#define SCOSNODENAME	"/dev/X%1sS"
#endif /* !__sun */
#endif
#if defined(XIM_t)
#ifdef __sun
#define NAMEDNODENAME "/tmp/.XIM-pipe/XIM"
#else
#define PTSNODENAME	"/dev/X/XIM."
#define NAMEDNODENAME	"/dev/X/NXIM."
#define SCORNODENAME	"/dev/XIM.%sR"
#define SCOSNODENAME	"/dev/XIM.%sS"
#endif
#endif
#if defined(FS_t) || defined (FONT_t)
#ifdef __sun
#define NAMEDNODENAME	"/tmp/.font-pipe/fs"
#else
/*
 * USL has already defined something here. We need to check with them
 * and see if their choice is usable here.
 */
#define PTSNODENAME	"/dev/X/fontserver."
#define NAMEDNODENAME	"/dev/X/Nfontserver."
#define SCORNODENAME	"/dev/fontserver.%sR"
#define SCOSNODENAME	"/dev/fontserver.%sS"
#endif
#endif
#if defined(ICE_t)
#ifdef __sun
#define NAMEDNODENAME	"/tmp/.ICE-pipe/"
#else
#define PTSNODENAME	"/dev/X/ICE."
#define NAMEDNODENAME	"/dev/X/NICE."
#define SCORNODENAME	"/dev/ICE.%sR"
#define SCOSNODENAME	"/dev/ICE.%sS"
#endif
#endif
#if defined(TEST_t)
#ifdef __sun
#define NAMEDNODENAME	"/tmp/.Test-unix/test"
#endif
#define PTSNODENAME	"/dev/X/transtest."
#define NAMEDNODENAME	"/dev/X/Ntranstest."
#define SCORNODENAME	"/dev/transtest.%sR"
#define SCOSNODENAME	"/dev/transtest.%sS"
#endif

#ifdef LOCAL_TRANS_PTS
#ifdef TRANS_CLIENT

static int
TRANS(PTSOpenClient)(XtransConnInfo ciptr, const char *port)

{
#ifdef PTSNODENAME
    int			fd,server,exitval,alarm_time,ret;
    char		server_path[64];
    char		*slave, namelen;
    char		buf[20]; /* MAX_PATH_LEN?? */
    PFV			savef;
    pid_t		saved_pid;
#endif

prmsg(2,"PTSOpenClient(%s)\n", port);

#if !defined(PTSNODENAME)
    prmsg(1,"PTSOpenClient: Protocol is not supported by a pts connection\n");
    return -1;
#else
    if (port && *port ) {
	if( *port == '/' ) { /* A full pathname */
	    snprintf(server_path, sizeof(server_path), "%s", port);
	} else {
	    snprintf(server_path, sizeof(server_path), "%s%s",
		     PTSNODENAME, port);
	}
    } else {
	snprintf(server_path, sizeof(server_path), "%s%d",
		 PTSNODENAME, getpid());
    }

/*
     * Open the node the on which the server is listening.
     */

if ((server = open (server_path, O_RDWR)) < 0) {
	prmsg(1,"PTSOpenClient: failed to open %s\n", server_path);
	return -1;
    }

/*
     * Open the streams based pipe that will be this connection.
     */

if ((fd = open(DEV_PTMX, O_RDWR)) < 0) {
	prmsg(1,"PTSOpenClient: failed to open %s\n", DEV_PTMX);
	close(server);
	return(-1);
    }

(void) grantpt(fd);
    (void) unlockpt(fd);

slave = ptsname(fd); /* get name */

if( slave == NULL ) {
	prmsg(1,"PTSOpenClient: failed to get ptsname()\n");
	close(fd);
	close(server);
	return -1;
    }

/*
     * This is neccesary for the case where a program is setuid to non-root.
     * grantpt() calls /usr/lib/pt_chmod which is set-uid root. This program will
     * set the owner of the pt device incorrectly if the uid is not restored
     * before it is called. The problem is that once it gets restored, it
     * cannot be changed back to its original condition, hence the fork().
     */

if(!(saved_pid=fork())) {
	uid_t       saved_euid;

saved_euid = geteuid();
	/** sets the euid to the actual/real uid **/
	if (setuid( getuid() ) == -1) {
		exit(1);
	}
	if( chown( slave, saved_euid, -1 ) < 0 ) {
		exit( 1 );
		}

exit( 0 );
    }

waitpid(saved_pid, &exitval, 0);
    if (WIFEXITED(exitval) && WEXITSTATUS(exitval) != 0) {
	close(fd);
	close(server);
	prmsg(1, "PTSOpenClient: cannot set the owner of %s\n",
	      slave);
	return(-1);
    }
    if (chmod(slave, 0666) < 0) {
	close(fd);
	close(server);
	prmsg(1,"PTSOpenClient: Cannot chmod %s\n", slave);
	return(-1);
    }

/*
     * write slave name to server
     */

namelen = strlen(slave);
    buf[0] = namelen;
    (void) sprintf(&buf[1], slave);
    (void) write(server, buf, namelen+1);
    (void) close(server);

/*
     * wait for server to respond
     */

savef = signal(SIGALRM, _dummy);
    alarm_time = alarm (30); /* CONNECT_TIMEOUT */

ret = read(fd, buf, 1);

(void) alarm(alarm_time);
    (void) signal(SIGALRM, savef);

if (ret != 1) {
	prmsg(1,
	"PTSOpenClient: failed to get acknoledgement from server\n");
	(void) close(fd);
	fd = -1;
    }

/*
     * Everything looks good: fill in the XtransConnInfo structure.
     */

if (TRANS(FillAddrInfo) (ciptr, slave, server_path) == 0)
    {
	prmsg(1,"PTSOpenClient: failed to fill in addr info\n");
	close(fd);
	return -1;
    }

return(fd);

#endif /* !PTSNODENAME */
}

#endif /* TRANS_CLIENT */

#ifdef TRANS_SERVER

static int
TRANS(PTSOpenServer)(XtransConnInfo ciptr, const char *port)

{
#ifdef PTSNODENAME
    int fd, server;
    char server_path[64], *slave;
    int mode;
#endif

prmsg(2,"PTSOpenServer(%s)\n", port);

#if !defined(PTSNODENAME)
    prmsg(1,"PTSOpenServer: Protocol is not supported by a pts connection\n");
    return -1;
#else
    if (port && *port ) {
	if( *port == '/' ) { /* A full pathname */
		(void) sprintf(server_path, "%s", port);
	    } else {
		(void) sprintf(server_path, "%s%s", PTSNODENAME, port);
	    }
    } else {
	(void) sprintf(server_path, "%s%d", PTSNODENAME, getpid());
    }

#ifdef HAS_STICKY_DIR_BIT
    mode = 01777;
#else
    mode = 0777;
#endif
    if (trans_mkdir(X_STREAMS_DIR, mode) == -1) {
	prmsg (1, "PTSOpenServer: mkdir(%s) failed, errno = %d\n",
	       X_STREAMS_DIR, errno);
	return(-1);
    }

#if 0
    if( (fd=open(server_path, O_RDWR)) >= 0 ) {
	/*
	 * This doesn't prevent the server from starting up, and doesn't
	 * prevent clients from trying to connect to the in-use PTS (which
	 * is often in use by something other than another server).
	 */
	prmsg(1, "PTSOpenServer: A server is already running on port %s\n", port);
	prmsg(1, "PTSOpenServer: Remove %s if this is incorrect.\n", server_path);
	close(fd);
	return(-1);
    }
#else
    /* Just remove the old path (which is what happens with UNIXCONN) */
#endif

unlink(server_path);

if( (fd=open(DEV_PTMX, O_RDWR)) < 0) {
	prmsg(1, "PTSOpenServer: Unable to open %s\n", DEV_PTMX);
	return(-1);
    }

grantpt(fd);
    unlockpt(fd);

if( (slave=ptsname(fd)) == NULL) {
	prmsg(1, "PTSOpenServer: Unable to get slave device name\n");
	close(fd);
	return(-1);
    }

if( link(slave,server_path) < 0 ) {
	prmsg(1, "PTSOpenServer: Unable to link %s to %s\n", slave, server_path);
	close(fd);
	return(-1);
    }

if( chmod(server_path, 0666) < 0 ) {
	prmsg(1, "PTSOpenServer: Unable to chmod %s to 0666\n", server_path);
	close(fd);
	return(-1);
    }

if( (server=open(server_path, O_RDWR)) < 0 ) {
	prmsg(1, "PTSOpenServer: Unable to open server device %s\n", server_path);
	close(fd);
	return(-1);
    }

close(server);

/*
     * Everything looks good: fill in the XtransConnInfo structure.
     */

if (TRANS(FillAddrInfo) (ciptr, server_path, server_path) == 0)
    {
	prmsg(1,"PTSOpenServer: failed to fill in addr info\n");
	close(fd);
	return -1;
    }

return fd;

#endif /* !PTSNODENAME */
}

static int
TRANS(PTSAccept)(XtransConnInfo ciptr, XtransConnInfo newciptr, int *status)

{
    int			newfd;
    int			in;
    unsigned char	length;
    char		buf[256];
    struct sockaddr_un	*sunaddr;

prmsg(2,"PTSAccept(%x->%d)\n",ciptr,ciptr->fd);

if( (in=read(ciptr->fd,&length,1)) <= 0 ){
	if( !in ) {
		prmsg(2,
		"PTSAccept: Incoming connection closed\n");
		}
	else {
		prmsg(1,
	"PTSAccept: Error reading incoming connection. errno=%d \n",
								errno);
		}
	*status = TRANS_ACCEPT_MISC_ERROR;
	return -1;
    }

if( (in=read(ciptr->fd,buf,length)) <= 0 ){
	if( !in ) {
		prmsg(2,
		"PTSAccept: Incoming connection closed\n");
		}
	else {
		prmsg(1,
"PTSAccept: Error reading device name for new connection. errno=%d \n",
								errno);
		}
	*status = TRANS_ACCEPT_MISC_ERROR;
	return -1;
    }

buf[length] = '\0';

if( (newfd=open(buf,O_RDWR)) < 0 ) {
	prmsg(1, "PTSAccept: Failed to open %s\n",buf);
	*status = TRANS_ACCEPT_MISC_ERROR;
	return -1;
    }

write(newfd,"1",1);

/*
     * Everything looks good: fill in the XtransConnInfo structure.
     */

newciptr->addrlen=ciptr->addrlen;
    if( (newciptr->addr = malloc(newciptr->addrlen)) == NULL ) {
	prmsg(1,"PTSAccept: failed to allocate memory for peer addr\n");
	close(newfd);
	*status = TRANS_ACCEPT_BAD_MALLOC;
	return -1;
    }

memcpy(newciptr->addr,ciptr->addr,newciptr->addrlen);

newciptr->peeraddrlen=sizeof(struct sockaddr_un);
    if( (sunaddr = malloc(newciptr->peeraddrlen)) == NULL ) {
	prmsg(1,"PTSAccept: failed to allocate memory for peer addr\n");
	free(newciptr->addr);
	close(newfd);
	*status = TRANS_ACCEPT_BAD_MALLOC;
	return -1;
    }

sunaddr->sun_family=AF_UNIX;
    strcpy(sunaddr->sun_path,buf);
#if defined(BSD44SOCKETS)
    sunaddr->sun_len=strlen(sunaddr->sun_path);
#endif

newciptr->peeraddr=(char *)sunaddr;

*status = 0;

return newfd;
}

#endif /* TRANS_SERVER */
#endif /* LOCAL_TRANS_PTS */

#ifdef LOCAL_TRANS_NAMED

/* NAMED */

#ifdef TRANS_CLIENT

static int
TRANS(NAMEDOpenClient)(XtransConnInfo ciptr, const char *port)

{
#ifdef NAMEDNODENAME
    int			fd;
    char		server_path[64];
    struct stat		filestat;
# ifndef __sun
    extern int		isastream(int);
# endif
#endif

prmsg(2,"NAMEDOpenClient(%s)\n", port);

#if !defined(NAMEDNODENAME)
    prmsg(1,"NAMEDOpenClient: Protocol is not supported by a NAMED connection\n");
    return -1;
#else
    if ( port && *port ) {
	if( *port == '/' ) { /* A full pathname */
		(void) snprintf(server_path, sizeof(server_path), "%s", port);
	    } else {
		(void) snprintf(server_path, sizeof(server_path), "%s%s", NAMEDNODENAME, port);
	    }
    } else {
	(void) snprintf(server_path, sizeof(server_path), "%s%ld", NAMEDNODENAME, (long)getpid());
    }

if ((fd = open(server_path, O_RDWR)) < 0) {
	prmsg(1,"NAMEDOpenClient: Cannot open %s for NAMED connection\n", server_path);
	return -1;
    }

if (fstat(fd, &filestat) < 0 ) {
	prmsg(1,"NAMEDOpenClient: Cannot stat %s for NAMED connection\n", server_path);
	(void) close(fd);
	return -1;
    }

if ((filestat.st_mode & S_IFMT) != S_IFIFO) {
	prmsg(1,"NAMEDOpenClient: Device %s is not a FIFO\n", server_path);
	/* Is this really a failure? */
	(void) close(fd);
	return -1;
    }

if (isastream(fd) <= 0) {
	prmsg(1,"NAMEDOpenClient: %s is not a streams device\n", server_path);
	(void) close(fd);
	return -1;
    }

/*
     * Everything looks good: fill in the XtransConnInfo structure.
     */

if (TRANS(FillAddrInfo) (ciptr, server_path, server_path) == 0)
    {
	prmsg(1,"NAMEDOpenClient: failed to fill in addr info\n");
	close(fd);
	return -1;
    }

return(fd);

#endif /* !NAMEDNODENAME */
}

#endif /* TRANS_CLIENT */

#ifdef TRANS_SERVER

#ifdef NAMEDNODENAME
static int
TRANS(NAMEDOpenPipe)(const char *server_path)
{
    int			fd, pipefd[2];
    struct stat		sbuf;
    int			mode;

prmsg(2,"NAMEDOpenPipe(%s)\n", server_path);

#ifdef HAS_STICKY_DIR_BIT
    mode = 01777;
#else
    mode = 0777;
#endif
    if (trans_mkdir(X_STREAMS_DIR, mode) == -1) {
	prmsg (1, "NAMEDOpenPipe: mkdir(%s) failed, errno = %d\n",
	       X_STREAMS_DIR, errno);
	return(-1);
    }

if(stat(server_path, &sbuf) != 0) {
	if (errno == ENOENT) {
	    if ((fd = creat(server_path, (mode_t)0666)) == -1) {
		prmsg(1, "NAMEDOpenPipe: Can't open %s\n", server_path);
		return(-1);
	    }
	    if (fchmod(fd, (mode_t)0666) < 0) {
		prmsg(1, "NAMEDOpenPipe: Can't chmod %s\n", server_path);
		close(fd);
		return(-1);
	    }
	    close(fd);
	} else {
	    prmsg(1, "NAMEDOpenPipe: stat on %s failed\n", server_path);
	    return(-1);
	}
    }

if( pipe(pipefd) != 0) {
	prmsg(1, "NAMEDOpenPipe: pipe() failed, errno=%d\n",errno);
	return(-1);
    }

if( ioctl(pipefd[0], I_PUSH, "connld") != 0) {
	prmsg(1, "NAMEDOpenPipe: ioctl(I_PUSH,\"connld\") failed, errno=%d\n",errno);
	close(pipefd[0]);
	close(pipefd[1]);
	return(-1);
    }

if( fattach(pipefd[0], server_path) != 0) {
	prmsg(1, "NAMEDOpenPipe: fattach(%s) failed, errno=%d\n", server_path,errno);
	close(pipefd[0]);
	close(pipefd[1]);
	return(-1);
    }

return(pipefd[1]);
}
#endif

static int
TRANS(NAMEDOpenServer)(XtransConnInfo ciptr, const char *port)
{
#ifdef NAMEDNODENAME
    int			fd;
    char		server_path[64];
#endif

prmsg(2,"NAMEDOpenServer(%s)\n", port);

#if !defined(NAMEDNODENAME)
    prmsg(1,"NAMEDOpenServer: Protocol is not supported by a NAMED connection\n");
    return -1;
#else
    if ( port && *port ) {
	if( *port == '/' ) { /* A full pathname */
	    (void) snprintf(server_path, sizeof(server_path), "%s", port);
	} else {
	    (void) snprintf(server_path, sizeof(server_path), "%s%s",
			    NAMEDNODENAME, port);
	}
    } else {
	(void) snprintf(server_path, sizeof(server_path), "%s%ld",
		       NAMEDNODENAME, (long)getpid());
    }

fd = TRANS(NAMEDOpenPipe)(server_path);
    if (fd < 0) {
	return -1;
    }

/*
     * Everything looks good: fill in the XtransConnInfo structure.
     */

if (TRANS(FillAddrInfo) (ciptr, server_path, server_path) == 0)
    {
	prmsg(1,"NAMEDOpenServer: failed to fill in addr info\n");
	TRANS(LocalClose)(ciptr);
	return -1;
    }

return fd;

#endif /* !NAMEDNODENAME */
}

static int
TRANS(NAMEDResetListener) (XtransConnInfo ciptr)

{
  struct sockaddr_un      *sockname=(struct sockaddr_un *) ciptr->addr;
  struct stat     statb;

prmsg(2,"NAMEDResetListener(%p, %d)\n", ciptr, ciptr->fd);

if (ciptr->fd != -1) {
    /*
     * see if the pipe has disappeared
     */

if (stat (sockname->sun_path, &statb) == -1 ||
	(statb.st_mode & S_IFMT) != S_IFIFO) {
      prmsg(3, "Pipe %s trashed, recreating\n", sockname->sun_path);
      TRANS(LocalClose)(ciptr);
      ciptr->fd = TRANS(NAMEDOpenPipe)(sockname->sun_path);
      if (ciptr->fd >= 0)
	  return TRANS_RESET_NEW_FD;
      else
	  return TRANS_CREATE_LISTENER_FAILED;
    }
  }
  return TRANS_RESET_NOOP;
}

static int
TRANS(NAMEDAccept)(XtransConnInfo ciptr, XtransConnInfo newciptr, int *status)

{
    struct strrecvfd str;

prmsg(2,"NAMEDAccept(%p->%d)\n", ciptr, ciptr->fd);

if( ioctl(ciptr->fd, I_RECVFD, &str ) < 0 ) {
	prmsg(1, "NAMEDAccept: ioctl(I_RECVFD) failed, errno=%d\n", errno);
	*status = TRANS_ACCEPT_MISC_ERROR;
	return(-1);
    }

/*
     * Everything looks good: fill in the XtransConnInfo structure.
     */
    newciptr->family=ciptr->family;
    newciptr->addrlen=ciptr->addrlen;
    if( (newciptr->addr = malloc(newciptr->addrlen)) == NULL ) {
	prmsg(1,
	      "NAMEDAccept: failed to allocate memory for pipe addr\n");
	close(str.fd);
	*status = TRANS_ACCEPT_BAD_MALLOC;
	return -1;
    }

memcpy(newciptr->addr,ciptr->addr,newciptr->addrlen);

newciptr->peeraddrlen=newciptr->addrlen;
    if( (newciptr->peeraddr = malloc(newciptr->peeraddrlen)) == NULL ) {
	prmsg(1,
	"NAMEDAccept: failed to allocate memory for peer addr\n");
	free(newciptr->addr);
	close(str.fd);
	*status = TRANS_ACCEPT_BAD_MALLOC;
	return -1;
    }

memcpy(newciptr->peeraddr,newciptr->addr,newciptr->peeraddrlen);

*status = 0;

return str.fd;
}

#endif /* TRANS_SERVER */

#endif /* LOCAL_TRANS_NAMED */

#if defined(LOCAL_TRANS_SCO)

/*
 * connect_spipe is used by the SCO connection type.
 */
static int
connect_spipe(int fd1, int fd2)
{
    long temp;
    struct strfdinsert sbuf;

sbuf.databuf.maxlen = -1;
    sbuf.databuf.len = -1;
    sbuf.databuf.buf = NULL;
    sbuf.ctlbuf.maxlen = sizeof(long);
    sbuf.ctlbuf.len = sizeof(long);
    sbuf.ctlbuf.buf = (caddr_t)&temp;
    sbuf.offset = 0;
    sbuf.fildes = fd2;
    sbuf.flags = 0;

if( ioctl(fd1, I_FDINSERT, &sbuf) < 0 )
	return(-1);

return(0);
}

/*
 * named_spipe is used by the SCO connection type.
 */

static int
named_spipe(int fd, char *path)

{
    int oldUmask, ret;
    struct stat sbuf;

oldUmask = umask(0);

(void) fstat(fd, &sbuf);
    ret = mknod(path, 0020666, sbuf.st_rdev);

umask(oldUmask);

if (ret < 0) {
	ret = -1;
    } else {
	ret = fd;
    }

return(ret);
}

#endif /* defined(LOCAL_TRANS_SCO) */

#ifdef LOCAL_TRANS_SCO
/* SCO */

/*
 * 2002-11-09 (jkj@sco.com)
 *
 * This code has been modified to match what is in the actual SCO X server.
 * This greatly helps inter-operability between X11R6 and X11R5 (the native
 * SCO server). Mainly, it relies on streams nodes existing in /dev, not
 * creating them or unlinking them, which breaks the native X server.
 *
 * However, this is only for the X protocol. For all other protocols, we
 * do in fact create the nodes, as only X11R6 will use them, and this makes
 * it possible to have both types of clients running, otherwise we get all
 * kinds of nasty errors on startup for anything that doesnt use the X
 * protocol (like SM, when KDE starts up).
 */

#ifdef TRANS_CLIENT

static int
TRANS(SCOOpenClient)(XtransConnInfo ciptr, const char *port)
{
#ifdef SCORNODENAME
    int			fd, server, fl, ret;
    char		server_path[64];
    struct strbuf	ctlbuf;
    unsigned long	alarm_time;
    void		(*savef)();
    long		temp;
    extern int	getmsg(), putmsg();
#endif

prmsg(2,"SCOOpenClient(%s)\n", port);
    if (!port || !port[0])
	port = "0";

#if !defined(SCORNODENAME)
    prmsg(2,"SCOOpenClient: Protocol is not supported by a SCO connection\n");
    return -1;
#else
    (void) sprintf(server_path, SCORNODENAME, port);

if ((server = open(server_path, O_RDWR)) < 0) {
	prmsg(1,"SCOOpenClient: failed to open %s\n", server_path);
	return -1;
    }

if ((fd = open(DEV_SPX, O_RDWR)) < 0) {
	prmsg(1,"SCOOpenClient: failed to open %s\n", DEV_SPX);
	close(server);
	return -1;
    }

(void) write(server, &server, 1);
    ctlbuf.len = 0;
    ctlbuf.maxlen = sizeof(long);
    ctlbuf.buf = (caddr_t)&temp;
    fl = 0;

savef = signal(SIGALRM, _dummy);
    alarm_time = alarm(10);

ret = getmsg(server, &ctlbuf, 0, &fl);

(void) alarm(alarm_time);
    (void) signal(SIGALRM, savef);

if (ret < 0) {
	prmsg(1,"SCOOpenClient: error from getmsg\n");
	close(fd);
	close(server);
	return -1;
    }

/* The msg we got via getmsg is the result of an
     * I_FDINSERT, so if we do a putmsg with whatever
     * we recieved, we're doing another I_FDINSERT ...
     */
    (void) putmsg(fd, &ctlbuf, 0, 0);
    (void) fcntl(fd,F_SETFL,fcntl(fd,F_GETFL,0)|O_NDELAY);

(void) close(server);

/*
     * Everything looks good: fill in the XtransConnInfo structure.
     */

#if defined(X11_t) && defined(__SCO__)
    ciptr->flags |= TRANS_NOUNLINK;
#endif
    if (TRANS(FillAddrInfo) (ciptr, server_path, server_path) == 0)
    {
	prmsg(1,"SCOOpenClient: failed to fill addr info\n");
	close(fd);
	return -1;
    }

return(fd);

#endif  /* !SCORNODENAME */
}

#endif /* TRANS_CLIENT */

#ifdef TRANS_SERVER

static int
TRANS(SCOOpenServer)(XtransConnInfo ciptr, const char *port)
{
#ifdef SCORNODENAME
    char		serverR_path[64];
    char		serverS_path[64];
    struct flock	mylock;
    int			fdr = -1;
    int			fds = -1;
#endif

prmsg(2,"SCOOpenServer(%s)\n", port);
    if (!port || !port[0])
	port = "0";

#if !defined(SCORNODENAME)
    prmsg(1,"SCOOpenServer: Protocol is not supported by a SCO connection\n");
    return -1;
#else
    (void) sprintf(serverR_path, SCORNODENAME, port);
    (void) sprintf(serverS_path, SCOSNODENAME, port);

#if !defined(X11_t) || !defined(__SCO__)
    unlink(serverR_path);
    unlink(serverS_path);

if ((fds = open(DEV_SPX, O_RDWR)) < 0 ||
	(fdr = open(DEV_SPX, O_RDWR)) < 0 ) {
	prmsg(1,"SCOOpenServer: failed to open %s\n", DEV_SPX);
	if (fds >= 0)
		close(fds);
	if (fdr >= 0)
		close(fdr);
	return -1;
    }

if (named_spipe (fds, serverS_path) == -1) {
	prmsg(1,"SCOOpenServer: failed to create %s\n", serverS_path);
	close (fdr);
	close (fds);
	return -1;
    }

if (named_spipe (fdr, serverR_path) == -1) {
	prmsg(1,"SCOOpenServer: failed to create %s\n", serverR_path);
	close (fdr);
	close (fds);
	return -1;
    }
#else /* X11_t */

fds = open (serverS_path, O_RDWR | O_NDELAY);
    if (fds < 0) {
	prmsg(1,"SCOOpenServer: failed to open %s\n", serverS_path);
	return -1;
    }

/*
     * Lock the connection device for the duration of the server.
     * This resolves multiple server starts especially on SMP machines.
     */
    mylock.l_type	= F_WRLCK;
    mylock.l_whence	= 0;
    mylock.l_start	= 0;
    mylock.l_len	= 0;
    if (fcntl (fds, F_SETLK, &mylock) < 0) {
	prmsg(1,"SCOOpenServer: failed to lock %s\n", serverS_path);
	close (fds);
	return -1;
    }

fdr = open (serverR_path, O_RDWR | O_NDELAY);
    if (fdr < 0) {
	prmsg(1,"SCOOpenServer: failed to open %s\n", serverR_path);
	close (fds);
	return -1;
    }
#endif /* X11_t */

if (connect_spipe(fds, fdr)) {
	prmsg(1,"SCOOpenServer: ioctl(I_FDINSERT) failed on %s\n",
	      serverS_path);
	close (fdr);
	close (fds);
	return -1;
    }

/*
     * Everything looks good: fill in the XtransConnInfo structure.
     */

#if defined(X11_t) && defined(__SCO__)
    ciptr->flags |= TRANS_NOUNLINK;
#endif
    if (TRANS(FillAddrInfo) (ciptr, serverS_path, serverR_path) == 0) {
	prmsg(1,"SCOOpenServer: failed to fill in addr info\n");
	close(fds);
	close(fdr);
	return -1;
    }

return(fds);

#endif /* !SCORNODENAME */
}

static int
TRANS(SCOAccept)(XtransConnInfo ciptr, XtransConnInfo newciptr, int *status)
{
    char		c;
    int			fd;

prmsg(2,"SCOAccept(%d)\n", ciptr->fd);

if (read(ciptr->fd, &c, 1) < 0) {
	prmsg(1,"SCOAccept: can't read from client\n");
	*status = TRANS_ACCEPT_MISC_ERROR;
	return(-1);
    }

if( (fd = open(DEV_SPX, O_RDWR)) < 0 ) {
	prmsg(1,"SCOAccept: can't open \"%s\"\n",DEV_SPX);
	*status = TRANS_ACCEPT_MISC_ERROR;
	return(-1);
    }

if (connect_spipe (ciptr->fd, fd) < 0) {
	prmsg(1,"SCOAccept: ioctl(I_FDINSERT) failed\n");
	close (fd);
	*status = TRANS_ACCEPT_MISC_ERROR;
	return -1;
    }

/*
     * Everything looks good: fill in the XtransConnInfo structure.
     */

newciptr->addrlen=ciptr->addrlen;
    if( (newciptr->addr = malloc(newciptr->addrlen)) == NULL ) {
	prmsg(1,
	      "SCOAccept: failed to allocate memory for peer addr\n");
	close(fd);
	*status = TRANS_ACCEPT_BAD_MALLOC;
	return -1;
    }

memcpy(newciptr->addr,ciptr->addr,newciptr->addrlen);
#if defined(__SCO__)
    newciptr->flags |= TRANS_NOUNLINK;
#endif

newciptr->peeraddrlen=newciptr->addrlen;
    if( (newciptr->peeraddr = malloc(newciptr->peeraddrlen)) == NULL ) {
	prmsg(1,
	      "SCOAccept: failed to allocate memory for peer addr\n");
	free(newciptr->addr);
	close(fd);
	*status = TRANS_ACCEPT_BAD_MALLOC;
	return -1;
    }

memcpy(newciptr->peeraddr,newciptr->addr,newciptr->peeraddrlen);

*status = 0;

return(fd);
}

#endif /* TRANS_SERVER */
#endif /* LOCAL_TRANS_SCO */

#ifdef TRANS_REOPEN
#ifdef LOCAL_TRANS_PTS

static int
TRANS(PTSReopenServer)(XtransConnInfo ciptr, int fd, const char *port)

{
#ifdef PTSNODENAME
    char server_path[64];
#endif

prmsg(2,"PTSReopenServer(%d,%s)\n", fd, port);

#if !defined(PTSNODENAME)
    prmsg(1,"PTSReopenServer: Protocol is not supported by a pts connection\n");
    return 0;
#else
    if (port && *port ) {
	if( *port == '/' ) { /* A full pathname */
	    snprintf(server_path, sizeof(server_path), "%s", port);
	} else {
	    snprintf(server_path, sizeof(server_path), "%s%s",
		     PTSNODENAME, port);
	}
    } else {
	snprintf(server_path, sizeof(server_path), "%s%ld",
		PTSNODENAME, (long)getpid());
    }

if (TRANS(FillAddrInfo) (ciptr, server_path, server_path) == 0)
    {
	prmsg(1,"PTSReopenServer: failed to fill in addr info\n");
	return 0;
    }

return 1;

#endif /* !PTSNODENAME */
}

#endif /* LOCAL_TRANS_PTS */

#ifdef LOCAL_TRANS_NAMED

static int
TRANS(NAMEDReopenServer)(XtransConnInfo ciptr, int fd _X_UNUSED, const char *port)

{
#ifdef NAMEDNODENAME
    char server_path[64];
#endif

prmsg(2,"NAMEDReopenServer(%s)\n", port);

#if !defined(NAMEDNODENAME)
    prmsg(1,"NAMEDReopenServer: Protocol is not supported by a NAMED connection\n");
    return 0;
#else
    if ( port && *port ) {
	if( *port == '/' ) { /* A full pathname */
	    snprintf(server_path, sizeof(server_path),"%s", port);
	} else {
	    snprintf(server_path, sizeof(server_path), "%s%s",
		     NAMEDNODENAME, port);
	}
    } else {
	snprintf(server_path, sizeof(server_path), "%s%ld",
		NAMEDNODENAME, (long)getpid());
    }

if (TRANS(FillAddrInfo) (ciptr, server_path, server_path) == 0)
    {
	prmsg(1,"NAMEDReopenServer: failed to fill in addr info\n");
	return 0;
    }

return 1;

#endif /* !NAMEDNODENAME */
}

#endif /* LOCAL_TRANS_NAMED */

#ifdef LOCAL_TRANS_SCO
static int
TRANS(SCOReopenServer)(XtransConnInfo ciptr, int fd, const char *port)

{
#ifdef SCORNODENAME
    char serverR_path[64], serverS_path[64];
#endif

prmsg(2,"SCOReopenServer(%s)\n", port);
    if (!port || !port[0])
      port = "0";

#if !defined(SCORNODENAME)
    prmsg(2,"SCOReopenServer: Protocol is not supported by a SCO connection\n");
    return 0;
#else
    (void) sprintf(serverR_path, SCORNODENAME, port);
    (void) sprintf(serverS_path, SCOSNODENAME, port);

#if defined(X11_t) && defined(__SCO__)
    ciptr->flags |= TRANS_NOUNLINK;
#endif
    if (TRANS(FillAddrInfo) (ciptr, serverS_path, serverR_path) == 0)
    {
	prmsg(1, "SCOReopenServer: failed to fill in addr info\n");
	return 0;
    }

return 1;

#endif /* SCORNODENAME */
}

#endif /* LOCAL_TRANS_SCO */

#endif /* TRANS_REOPEN */

/*
 * This table contains all of the entry points for the different local
 * connection mechanisms.
 */

typedef struct _LOCALtrans2dev {
    const char	*transname;

#ifdef TRANS_CLIENT

int	(*devcotsopenclient)(
	XtransConnInfo, const char * /*port*/
);

#endif /* TRANS_CLIENT */

#ifdef TRANS_SERVER

int	(*devcotsopenserver)(
	XtransConnInfo, const char * /*port*/
);

#endif /* TRANS_SERVER */

#ifdef TRANS_CLIENT

int	(*devcltsopenclient)(
	XtransConnInfo, const char * /*port*/
);

#endif /* TRANS_CLIENT */

#ifdef TRANS_SERVER

int	(*devcltsopenserver)(
	XtransConnInfo, const char * /*port*/
);

#endif /* TRANS_SERVER */

#ifdef TRANS_REOPEN

int	(*devcotsreopenserver)(
	XtransConnInfo,
	int, 	/* fd */
	const char * 	/* port */
);

int	(*devcltsreopenserver)(
	XtransConnInfo,
	int, 	/* fd */
	const char *	/* port */
);

#endif /* TRANS_REOPEN */

#ifdef TRANS_SERVER

int (*devreset)(
	XtransConnInfo /* ciptr */
);

int	(*devaccept)(
	XtransConnInfo, XtransConnInfo, int *
);

#endif /* TRANS_SERVER */

} LOCALtrans2dev;

static LOCALtrans2dev LOCALtrans2devtab[] = {
#ifdef LOCAL_TRANS_PTS
{"",
#ifdef TRANS_CLIENT
     TRANS(PTSOpenClient),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
     TRANS(PTSOpenServer),
#endif /* TRANS_SERVER */
#ifdef TRANS_CLIENT
     TRANS(OpenFail),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
     TRANS(OpenFail),
#endif /* TRANS_SERVER */
#ifdef TRANS_REOPEN
     TRANS(PTSReopenServer),
     TRANS(ReopenFail),
#endif
#ifdef TRANS_SERVER
     NULL,		/* ResetListener */
     TRANS(PTSAccept)
#endif /* TRANS_SERVER */
},

{"local",
#ifdef TRANS_CLIENT
     TRANS(PTSOpenClient),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
     TRANS(PTSOpenServer),
#endif /* TRANS_SERVER */
#ifdef TRANS_CLIENT
     TRANS(OpenFail),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
     TRANS(OpenFail),
#endif /* TRANS_SERVER */
#ifdef TRANS_REOPEN
     TRANS(PTSReopenServer),
     TRANS(ReopenFail),
#endif
#ifdef TRANS_SERVER
     NULL,		/* ResetListener */
     TRANS(PTSAccept)
#endif /* TRANS_SERVER */
},

{"pts",
#ifdef TRANS_CLIENT
     TRANS(PTSOpenClient),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
     TRANS(PTSOpenServer),
#endif /* TRANS_SERVER */
#ifdef TRANS_CLIENT
     TRANS(OpenFail),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
     TRANS(OpenFail),
#endif /* TRANS_SERVER */
#ifdef TRANS_REOPEN
     TRANS(PTSReopenServer),
     TRANS(ReopenFail),
#endif
#ifdef TRANS_SERVER
     NULL,		/* ResetListener */
     TRANS(PTSAccept)
#endif /* TRANS_SERVER */
},
#else /* !LOCAL_TRANS_PTS */
{"",
#ifdef TRANS_CLIENT
     TRANS(NAMEDOpenClient),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
     TRANS(NAMEDOpenServer),
#endif /* TRANS_SERVER */
#ifdef TRANS_CLIENT
     TRANS(OpenFail),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
     TRANS(OpenFail),
#endif /* TRANS_SERVER */
#ifdef TRANS_REOPEN
     TRANS(NAMEDReopenServer),
     TRANS(ReopenFail),
#endif
#ifdef TRANS_SERVER
     TRANS(NAMEDResetListener),
     TRANS(NAMEDAccept)
#endif /* TRANS_SERVER */
},

{"local",
#ifdef TRANS_CLIENT
     TRANS(NAMEDOpenClient),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
     TRANS(NAMEDOpenServer),
#endif /* TRANS_SERVER */
#ifdef TRANS_CLIENT
     TRANS(OpenFail),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
     TRANS(OpenFail),
#endif /* TRANS_SERVER */
#ifdef TRANS_REOPEN
     TRANS(NAMEDReopenServer),
     TRANS(ReopenFail),
#endif
#ifdef TRANS_SERVER
     TRANS(NAMEDResetListener),
     TRANS(NAMEDAccept)
#endif /* TRANS_SERVER */
},
#endif /* !LOCAL_TRANS_PTS */

#ifdef LOCAL_TRANS_NAMED
{"named",
#ifdef TRANS_CLIENT
     TRANS(NAMEDOpenClient),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
     TRANS(NAMEDOpenServer),
#endif /* TRANS_SERVER */
#ifdef TRANS_CLIENT
     TRANS(OpenFail),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
     TRANS(OpenFail),
#endif /* TRANS_SERVER */
#ifdef TRANS_REOPEN
     TRANS(NAMEDReopenServer),
     TRANS(ReopenFail),
#endif
#ifdef TRANS_SERVER
     TRANS(NAMEDResetListener),
     TRANS(NAMEDAccept)
#endif /* TRANS_SERVER */
},

#ifdef __sun /* Alias "pipe" to named, since that's what Solaris called it */
{"pipe",
#ifdef TRANS_CLIENT
     TRANS(NAMEDOpenClient),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
     TRANS(NAMEDOpenServer),
#endif /* TRANS_SERVER */
#ifdef TRANS_CLIENT
     TRANS(OpenFail),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
     TRANS(OpenFail),
#endif /* TRANS_SERVER */
#ifdef TRANS_REOPEN
     TRANS(NAMEDReopenServer),
     TRANS(ReopenFail),
#endif
#ifdef TRANS_SERVER
     TRANS(NAMEDResetListener),
     TRANS(NAMEDAccept)
#endif /* TRANS_SERVER */
},
#endif /* __sun */
#endif /* LOCAL_TRANS_NAMED */

#ifdef LOCAL_TRANS_SCO
{"sco",
#ifdef TRANS_CLIENT
     TRANS(SCOOpenClient),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
     TRANS(SCOOpenServer),
#endif /* TRANS_SERVER */
#ifdef TRANS_CLIENT
     TRANS(OpenFail),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
     TRANS(OpenFail),
#endif /* TRANS_SERVER */
#ifdef TRANS_REOPEN
     TRANS(SCOReopenServer),
     TRANS(ReopenFail),
#endif
#ifdef TRANS_SERVER
     NULL,		/* ResetListener */
     TRANS(SCOAccept)
#endif /* TRANS_SERVER */
},
#endif /* LOCAL_TRANS_SCO */
};

#define NUMTRANSPORTS	(sizeof(LOCALtrans2devtab)/sizeof(LOCALtrans2dev))

static const char	*XLOCAL=NULL;
static	char	*workingXLOCAL=NULL;
static	char	*freeXLOCAL=NULL;

#if defined(__SCO__)
#define DEF_XLOCAL "SCO:UNIX:PTS"
#elif defined(__UNIXWARE__)
#define DEF_XLOCAL "UNIX:PTS:NAMED:SCO"
#elif defined(__sun)
#define DEF_XLOCAL "UNIX:NAMED"
#else
#define DEF_XLOCAL "UNIX:PTS:NAMED:SCO"
#endif

static void
TRANS(LocalInitTransports)(const char *protocol)

{
    prmsg(3,"LocalInitTransports(%s)\n", protocol);

if( strcmp(protocol,"local") && strcmp(protocol,"LOCAL") )
    {
	workingXLOCAL = freeXLOCAL = strdup (protocol);
    }
    else {
	XLOCAL=(char *)getenv("XLOCAL");
	if(XLOCAL==NULL)
	    XLOCAL=DEF_XLOCAL;
	workingXLOCAL = freeXLOCAL = strdup (XLOCAL);
    }
}

static void
TRANS(LocalEndTransports)(void)

{
    prmsg(3,"LocalEndTransports()\n");
    free(freeXLOCAL);
    freeXLOCAL = NULL;
}

#define TYPEBUFSIZE	32

#ifdef TRANS_CLIENT

static LOCALtrans2dev *
TRANS(LocalGetNextTransport)(void)

{
    int		i;
    char	*typetocheck;
    prmsg(3,"LocalGetNextTransport()\n");

while(1)
    {
	if( workingXLOCAL == NULL || *workingXLOCAL == '\0' )
	    return NULL;

typetocheck=workingXLOCAL;
	workingXLOCAL=strchr(workingXLOCAL,':');
	if(workingXLOCAL && *workingXLOCAL)
	    *workingXLOCAL++='\0';

for(i=0;i<NUMTRANSPORTS;i++)
	{
#ifndef HAVE_STRCASECMP
	    int		j;
	    char	typebuf[TYPEBUFSIZE];
	    /*
	     * This is equivalent to a case insensitive strcmp(),
	     * but should be more portable.
	     */
	    strncpy(typebuf,typetocheck,TYPEBUFSIZE);
	    for(j=0;j<TYPEBUFSIZE;j++)
		if (isupper(typebuf[j]))
		    typebuf[j]=tolower(typebuf[j]);

/* Now, see if they match */
	    if(!strcmp(LOCALtrans2devtab[i].transname,typebuf))
#else
	    if(!strcasecmp(LOCALtrans2devtab[i].transname,typetocheck))
#endif
		return &LOCALtrans2devtab[i];
	}
    }
#if 0
    /*NOTREACHED*/
    return NULL;
#endif
}

#ifdef NEED_UTSNAME
#include <sys/utsname.h>
#endif

/*
 * Make sure 'host' is really local.
 */

static int
HostReallyLocal (const char *host)

{
    /*
     * The 'host' passed to this function may have been generated
     * by either uname() or gethostname().  We try both if possible.
     */

#ifdef NEED_UTSNAME
    struct utsname name;
#endif
    char buf[256];

#ifdef NEED_UTSNAME
    if (uname (&name) >= 0 && strcmp (host, name.nodename) == 0)
	return (1);
#endif

buf[0] = '\0';
    (void) gethostname (buf, 256);
    buf[255] = '\0';

if (strcmp (host, buf) == 0)
	return (1);

return (0);
}

static XtransConnInfo
TRANS(LocalOpenClient)(int type, const char *protocol,
                       const char *host, const char *port)

{
    LOCALtrans2dev *transptr;
    XtransConnInfo ciptr;
    int index;

prmsg(3,"LocalOpenClient()\n");

/*
     * Make sure 'host' is really local.  If not, we return failure.
     * The reason we make this check is because a process may advertise
     * a "local" address for which it can accept connections, but if a
     * process on a remote machine tries to connect to this address,
     * we know for sure it will fail.
     */

if (strcmp (host, "unix") != 0 && !HostReallyLocal (host))
    {
	prmsg (1,
	   "LocalOpenClient: Cannot connect to non-local host %s\n",
	       host);
	return NULL;
    }

#if defined(X11_t)
    /*
     * X has a well known port, that is transport dependant. It is easier
     * to handle it here, than try and come up with a transport independent
     * representation that can be passed in and resolved the usual way.
     *
     * The port that is passed here is really a string containing the idisplay
     * from ConnectDisplay(). Since that is what we want for the local transports,
     * we don't have to do anything special.
     */
#endif /* X11_t */

if( (ciptr = calloc(1,sizeof(struct _XtransConnInfo))) == NULL )
    {
	prmsg(1,"LocalOpenClient: calloc(1,%lu) failed\n",
	      sizeof(struct _XtransConnInfo));
	return NULL;
    }

ciptr->fd = -1;

TRANS(LocalInitTransports)(protocol);

index = 0;
    for(transptr=TRANS(LocalGetNextTransport)();
	transptr!=NULL;transptr=TRANS(LocalGetNextTransport)(), index++)
    {
	switch( type )
	{
	case XTRANS_OPEN_COTS_CLIENT:
	    ciptr->fd=transptr->devcotsopenclient(ciptr,port);
	    break;
	case XTRANS_OPEN_COTS_SERVER:
	    prmsg(1,
		  "LocalOpenClient: Should not be opening a server with this function\n");
	    break;
	default:
	    prmsg(1,
		  "LocalOpenClient: Unknown Open type %d\n",
		  type);
	}
	if( ciptr->fd >= 0 )
	    break;
    }

TRANS(LocalEndTransports)();

if( ciptr->fd < 0 )
    {
	free(ciptr);
	return NULL;
    }

ciptr->priv=(char *)transptr;
    ciptr->index = index;

return ciptr;
}

#endif /* TRANS_CLIENT */

#ifdef TRANS_SERVER

static XtransConnInfo
TRANS(LocalOpenServer)(int type, const char *protocol,
                       const char *host _X_UNUSED, const char *port)

{
    int	i;
    XtransConnInfo ciptr;

prmsg(2,"LocalOpenServer(%d,%s,%s)\n", type, protocol, port);

#if defined(X11_t)
    /*
     * For X11, the port will be in the format xserverN where N is the
     * display number. All of the local connections just need to know
     * the display number because they don't do any name resolution on
     * the port. This just truncates port to the display portion.
     */
#endif /* X11_t */

if( (ciptr = calloc(1,sizeof(struct _XtransConnInfo))) == NULL )
    {
	prmsg(1,"LocalOpenServer: calloc(1,%lu) failed\n",
	      sizeof(struct _XtransConnInfo));
	return NULL;
    }

for(i=1;i<NUMTRANSPORTS;i++)
    {
	if( strcmp(protocol,LOCALtrans2devtab[i].transname) != 0 )
	    continue;
	switch( type )
	{
	case XTRANS_OPEN_COTS_CLIENT:
	    prmsg(1,
		  "LocalOpenServer: Should not be opening a client with this function\n");
	    break;
	case XTRANS_OPEN_COTS_SERVER:
	    ciptr->fd=LOCALtrans2devtab[i].devcotsopenserver(ciptr,port);
	    break;
	default:
	    prmsg(1,"LocalOpenServer: Unknown Open type %d\n",
		  type );
	}
	if( ciptr->fd >= 0 ) {
	    ciptr->priv=(char *)&LOCALtrans2devtab[i];
	    ciptr->index=i;
	    ciptr->flags = 1 | (ciptr->flags & TRANS_KEEPFLAGS);
	    return ciptr;
	}
    }

free(ciptr);
    return NULL;
}

#endif /* TRANS_SERVER */

#ifdef TRANS_REOPEN

static XtransConnInfo
TRANS(LocalReopenServer)(int type, int index, int fd, const char *port)

{
    XtransConnInfo ciptr;
    int stat = 0;

prmsg(2,"LocalReopenServer(%d,%d,%d)\n", type, index, fd);

if( (ciptr = calloc(1,sizeof(struct _XtransConnInfo))) == NULL )
    {
	prmsg(1,"LocalReopenServer: calloc(1,%lu) failed\n",
	      sizeof(struct _XtransConnInfo));
	return NULL;
    }

ciptr->fd = fd;

switch( type )
    {
    case XTRANS_OPEN_COTS_SERVER:
	stat = LOCALtrans2devtab[index].devcotsreopenserver(ciptr,fd,port);
	break;
    default:
	prmsg(1,"LocalReopenServer: Unknown Open type %d\n",
	  type );
    }

if( stat > 0 ) {
	ciptr->priv=(char *)&LOCALtrans2devtab[index];
	ciptr->index=index;
	ciptr->flags = 1 | (ciptr->flags & TRANS_KEEPFLAGS);
	return ciptr;
    }

free(ciptr);
    return NULL;
}

#endif /* TRANS_REOPEN */

/*
 * This is the Local implementation of the X Transport service layer
 */

#ifdef TRANS_CLIENT

static XtransConnInfo
TRANS(LocalOpenCOTSClient)(Xtransport *thistrans _X_UNUSED, const char *protocol,
			   const char *host, const char *port)

{
    prmsg(2,"LocalOpenCOTSClient(%s,%s,%s)\n",protocol,host,port);

return TRANS(LocalOpenClient)(XTRANS_OPEN_COTS_CLIENT, protocol, host, port);
}

#endif /* TRANS_CLIENT */

#ifdef TRANS_SERVER

static XtransConnInfo
TRANS(LocalOpenCOTSServer)(Xtransport *thistrans, const char *protocol,
			   const char *host, const char *port)

{
    char *typetocheck = NULL;
    int found = 0;

prmsg(2,"LocalOpenCOTSServer(%s,%s,%s)\n",protocol,host,port);

/* Check if this local type is in the XLOCAL list */
    TRANS(LocalInitTransports)("local");
    typetocheck = workingXLOCAL;
    while (typetocheck && !found) {
#ifndef HAVE_STRCASECMP
	int j;
	char typebuf[TYPEBUFSIZE];
#endif

workingXLOCAL = strchr(workingXLOCAL, ':');
	if (workingXLOCAL && *workingXLOCAL)
	    *workingXLOCAL++ = '\0';
#ifndef HAVE_STRCASECMP
	strncpy(typebuf, typetocheck, TYPEBUFSIZE);
	for (j = 0; j < TYPEBUFSIZE; j++)
	    if (isupper(typebuf[j]))
		typebuf[j] = tolower(typebuf[j]);
	if (!strcmp(thistrans->TransName, typebuf))
#else
	if (!strcasecmp(thistrans->TransName, typetocheck))
#endif
	    found = 1;
	typetocheck = workingXLOCAL;
    }
    TRANS(LocalEndTransports)();

if (!found) {
	prmsg(3,"LocalOpenCOTSServer: disabling %s\n",thistrans->TransName);
	thistrans->flags |= TRANS_DISABLED;
	return NULL;
    }

return TRANS(LocalOpenServer)(XTRANS_OPEN_COTS_SERVER, protocol, host, port);
}

#endif /* TRANS_SERVER */

#ifdef TRANS_REOPEN

static XtransConnInfo
TRANS(LocalReopenCOTSServer)(Xtransport *thistrans, int fd, const char *port)

{
    int index;

prmsg(2,"LocalReopenCOTSServer(%d,%s)\n", fd, port);

for(index=1;index<NUMTRANSPORTS;index++)
    {
	if( strcmp(thistrans->TransName,
	    LOCALtrans2devtab[index].transname) == 0 )
	    break;
    }

if (index >= NUMTRANSPORTS)
    {
	return (NULL);
    }

return TRANS(LocalReopenServer)(XTRANS_OPEN_COTS_SERVER,
	index, fd, port);
}

#endif /* TRANS_REOPEN */

static int
TRANS(LocalSetOption)(XtransConnInfo ciptr, int option, int arg)

{
    prmsg(2,"LocalSetOption(%d,%d,%d)\n",ciptr->fd,option,arg);

return -1;
}

#ifdef TRANS_SERVER

static int
TRANS(LocalCreateListener)(XtransConnInfo ciptr, const char *port,
                           unsigned int flags _X_UNUSED)

{
    prmsg(2,"LocalCreateListener(%p->%d,%s)\n",ciptr,ciptr->fd,port);

return 0;
}

static int
TRANS(LocalResetListener)(XtransConnInfo ciptr)

{
    LOCALtrans2dev	*transptr;

prmsg(2,"LocalResetListener(%p)\n",ciptr);

transptr=(LOCALtrans2dev *)ciptr->priv;
    if (transptr->devreset != NULL) {
	return transptr->devreset(ciptr);
    }
    return TRANS_RESET_NOOP;
}

static XtransConnInfo
TRANS(LocalAccept)(XtransConnInfo ciptr, int *status)

{
    XtransConnInfo	newciptr;
    LOCALtrans2dev	*transptr;

prmsg(2,"LocalAccept(%p->%d)\n", ciptr, ciptr->fd);

transptr=(LOCALtrans2dev *)ciptr->priv;

if( (newciptr = calloc(1,sizeof(struct _XtransConnInfo)))==NULL )
    {
	prmsg(1,"LocalAccept: calloc(1,%lu) failed\n",
	      sizeof(struct _XtransConnInfo));
	*status = TRANS_ACCEPT_BAD_MALLOC;
	return NULL;
    }

newciptr->fd=transptr->devaccept(ciptr,newciptr,status);

if( newciptr->fd < 0 )
    {
	free(newciptr);
	return NULL;
    }

newciptr->priv=(char *)transptr;
    newciptr->index = ciptr->index;

*status = 0;

return newciptr;
}

#endif /* TRANS_SERVER */

#ifdef TRANS_CLIENT

static int
TRANS(LocalConnect)(XtransConnInfo ciptr,
                    const char *host _X_UNUSED, const char *port)

{
    prmsg(2,"LocalConnect(%p->%d,%s)\n", ciptr, ciptr->fd, port);

return 0;
}

#endif /* TRANS_CLIENT */

static int
TRANS(LocalBytesReadable)(XtransConnInfo ciptr, BytesReadable_t *pend )

{
    prmsg(2,"LocalBytesReadable(%p->%d,%p)\n", ciptr, ciptr->fd, pend);

#if defined(SCO325)
    return ioctl(ciptr->fd, I_NREAD, (char *)pend);
#else
    return ioctl(ciptr->fd, FIONREAD, (char *)pend);
#endif
}

static int
TRANS(LocalRead)(XtransConnInfo ciptr, char *buf, int size)

{
    prmsg(2,"LocalRead(%d,%p,%d)\n", ciptr->fd, buf, size );

return read(ciptr->fd,buf,size);
}

static int
TRANS(LocalWrite)(XtransConnInfo ciptr, char *buf, int size)

{
    prmsg(2,"LocalWrite(%d,%p,%d)\n", ciptr->fd, buf, size );

return write(ciptr->fd,buf,size);
}

static int
TRANS(LocalReadv)(XtransConnInfo ciptr, struct iovec *buf, int size)

{
    prmsg(2,"LocalReadv(%d,%p,%d)\n", ciptr->fd, buf, size );

return READV(ciptr,buf,size);
}

static int
TRANS(LocalWritev)(XtransConnInfo ciptr, struct iovec *buf, int size)

{
    prmsg(2,"LocalWritev(%d,%p,%d)\n", ciptr->fd, buf, size );

return WRITEV(ciptr,buf,size);
}

static int
TRANS(LocalDisconnect)(XtransConnInfo ciptr)

{
    prmsg(2,"LocalDisconnect(%p->%d)\n", ciptr, ciptr->fd);

return 0;
}

static int
TRANS(LocalClose)(XtransConnInfo ciptr)

{
    struct sockaddr_un      *sockname=(struct sockaddr_un *) ciptr->addr;
    int	ret;

prmsg(2,"LocalClose(%p->%d)\n", ciptr, ciptr->fd );

ret=close(ciptr->fd);

if(ciptr->flags
       && sockname
       && sockname->sun_family == AF_UNIX
       && sockname->sun_path[0] )
    {
	if (!(ciptr->flags & TRANS_NOUNLINK))
	    unlink(sockname->sun_path);
    }

return ret;
}

static int
TRANS(LocalCloseForCloning)(XtransConnInfo ciptr)

{
    int ret;

prmsg(2,"LocalCloseForCloning(%p->%d)\n", ciptr, ciptr->fd );

/* Don't unlink path */

ret=close(ciptr->fd);

return ret;
}

/*
 * MakeAllCOTSServerListeners() will go through the entire Xtransports[]
 * array defined in Xtrans.c and try to OpenCOTSServer() for each entry.
 * We will add duplicate entries to that table so that the OpenCOTSServer()
 * function will get called once for each type of local transport.
 *
 * The TransName is in lowercase, so it will never match during a normal
 * call to SelectTransport() in Xtrans.c.
 */

#ifdef TRANS_SERVER
static const char * local_aliases[] = {
# ifdef LOCAL_TRANS_PTS
                                  "pts",
# endif
				  "named",
# ifdef __sun
				  "pipe", /* compatibility with Solaris Xlib */
# endif
# ifdef LOCAL_TRANS_SCO
				  "sco",
# endif
				  NULL };
#endif

Xtransport	TRANS(LocalFuncs) = {
	/* Local Interface */
	"local",
	TRANS_ALIAS | TRANS_LOCAL,
#ifdef TRANS_CLIENT
	TRANS(LocalOpenCOTSClient),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
	local_aliases,
	TRANS(LocalOpenCOTSServer),
#endif /* TRANS_SERVER */
#ifdef TRANS_REOPEN
	TRANS(LocalReopenCOTSServer),
#endif
	TRANS(LocalSetOption),
#ifdef TRANS_SERVER
	TRANS(LocalCreateListener),
	TRANS(LocalResetListener),
	TRANS(LocalAccept),
#endif /* TRANS_SERVER */
#ifdef TRANS_CLIENT
	TRANS(LocalConnect),
#endif /* TRANS_CLIENT */
	TRANS(LocalBytesReadable),
	TRANS(LocalRead),
	TRANS(LocalWrite),
	TRANS(LocalReadv),
	TRANS(LocalWritev),
#if XTRANS_SEND_FDS
	TRANS(LocalSendFdInvalid),
	TRANS(LocalRecvFdInvalid),
#endif
	TRANS(LocalDisconnect),
	TRANS(LocalClose),
	TRANS(LocalCloseForCloning),
};

#ifdef LOCAL_TRANS_PTS

Xtransport	TRANS(PTSFuncs) = {
	/* Local Interface */
	"pts",
	TRANS_LOCAL,
#ifdef TRANS_CLIENT
	TRANS(LocalOpenCOTSClient),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
	NULL,
	TRANS(LocalOpenCOTSServer),
#endif /* TRANS_SERVER */
#ifdef TRANS_REOPEN
	TRANS(LocalReopenCOTSServer),
#endif
	TRANS(LocalSetOption),
#ifdef TRANS_SERVER
	TRANS(LocalCreateListener),
	TRANS(LocalResetListener),
	TRANS(LocalAccept),
#endif /* TRANS_SERVER */
#ifdef TRANS_CLIENT
	TRANS(LocalConnect),
#endif /* TRANS_CLIENT */
	TRANS(LocalBytesReadable),
	TRANS(LocalRead),
	TRANS(LocalWrite),
	TRANS(LocalReadv),
	TRANS(LocalWritev),
#if XTRANS_SEND_FDS
	TRANS(LocalSendFdInvalid),
	TRANS(LocalRecvFdInvalid),
#endif
	TRANS(LocalDisconnect),
	TRANS(LocalClose),
	TRANS(LocalCloseForCloning),
};

#endif /* LOCAL_TRANS_PTS */

#ifdef LOCAL_TRANS_NAMED

Xtransport	TRANS(NAMEDFuncs) = {
	/* Local Interface */
	"named",
	TRANS_LOCAL,
#ifdef TRANS_CLIENT
	TRANS(LocalOpenCOTSClient),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
	NULL,
	TRANS(LocalOpenCOTSServer),
#endif /* TRANS_SERVER */
#ifdef TRANS_REOPEN
	TRANS(LocalReopenCOTSServer),
#endif
	TRANS(LocalSetOption),
#ifdef TRANS_SERVER
	TRANS(LocalCreateListener),
	TRANS(LocalResetListener),
	TRANS(LocalAccept),
#endif /* TRANS_SERVER */
#ifdef TRANS_CLIENT
	TRANS(LocalConnect),
#endif /* TRANS_CLIENT */
	TRANS(LocalBytesReadable),
	TRANS(LocalRead),
	TRANS(LocalWrite),
	TRANS(LocalReadv),
	TRANS(LocalWritev),
#if XTRANS_SEND_FDS
	TRANS(LocalSendFdInvalid),
	TRANS(LocalRecvFdInvalid),
#endif
	TRANS(LocalDisconnect),
	TRANS(LocalClose),
	TRANS(LocalCloseForCloning),
};

#ifdef __sun
Xtransport	TRANS(PIPEFuncs) = {
	/* Local Interface */
	"pipe",
	TRANS_ALIAS | TRANS_LOCAL,
#ifdef TRANS_CLIENT
	TRANS(LocalOpenCOTSClient),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
	NULL,
	TRANS(LocalOpenCOTSServer),
#endif /* TRANS_SERVER */
#ifdef TRANS_REOPEN
	TRANS(LocalReopenCOTSServer),
#endif
	TRANS(LocalSetOption),
#ifdef TRANS_SERVER
	TRANS(LocalCreateListener),
	TRANS(LocalResetListener),
	TRANS(LocalAccept),
#endif /* TRANS_SERVER */
#ifdef TRANS_CLIENT
	TRANS(LocalConnect),
#endif /* TRANS_CLIENT */
	TRANS(LocalBytesReadable),
	TRANS(LocalRead),
	TRANS(LocalWrite),
	TRANS(LocalReadv),
	TRANS(LocalWritev),
#if XTRANS_SEND_FDS
	TRANS(LocalSendFdInvalid),
	TRANS(LocalRecvFdInvalid),
#endif
	TRANS(LocalDisconnect),
	TRANS(LocalClose),
	TRANS(LocalCloseForCloning),
};
#endif /* __sun */
#endif /* LOCAL_TRANS_NAMED */

#ifdef LOCAL_TRANS_SCO
Xtransport	TRANS(SCOFuncs) = {
	/* Local Interface */
	"sco",
	TRANS_LOCAL,
#ifdef TRANS_CLIENT
	TRANS(LocalOpenCOTSClient),
#endif /* TRANS_CLIENT */
#ifdef TRANS_SERVER
	NULL,
	TRANS(LocalOpenCOTSServer),
#endif /* TRANS_SERVER */
#ifdef TRANS_REOPEN
	TRANS(LocalReopenCOTSServer),
#endif
	TRANS(LocalSetOption),
#ifdef TRANS_SERVER
	TRANS(LocalCreateListener),
	TRANS(LocalResetListener),
	TRANS(LocalAccept),
#endif /* TRANS_SERVER */
#ifdef TRANS_CLIENT
	TRANS(LocalConnect),
#endif /* TRANS_CLIENT */
	TRANS(LocalBytesReadable),
	TRANS(LocalRead),
	TRANS(LocalWrite),
	TRANS(LocalReadv),
	TRANS(LocalWritev),
#if XTRANS_SEND_FDS
	TRANS(LocalSendFdInvalid),
	TRANS(LocalRecvFdInvalid),
#endif
	TRANS(LocalDisconnect),
	TRANS(LocalClose),
	TRANS(LocalCloseForCloning),
};
#endif /* LOCAL_TRANS_SCO */