xserver/os/Xtrans.c

/*

Copyright 1993, 1994, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
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.
IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from The Open Group.

 * 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.
 */
#include <dix-config.h>

#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_SYSTEMD_DAEMON
#include <systemd/sd-daemon.h>
#endif

#include "os/ossock.h"
#include "os/xhostname.h"

/*
 * The transport table contains a definition for every transport (protocol)
 * family. All operations that can be made on the transport go through this
 * table.
 *
 * Each transport is assigned a unique transport id.
 *
 * New transports can be added by adding an entry in this table.
 * For compatibility, the transport ids should never be renumbered.
 * Always add to the end of the list.
 */

#define TRANS_SOCKET_UNIX_INDEX		4
#define TRANS_SOCKET_LOCAL_INDEX	5
#define TRANS_SOCKET_INET_INDEX		6
#define TRANS_SOCKET_TCP_INDEX		7
#define TRANS_SOCKET_INET6_INDEX	14

#if defined(IPv6) && !defined(AF_INET6)
#error "Cannot build IPv6 support without AF_INET6"
#endif

static
Xtransport_table Xtransports[] = {
    { &_XSERVTransSocketTCPFuncs,	TRANS_SOCKET_TCP_INDEX },
#if defined(IPv6)
    { &_XSERVTransSocketINET6Funcs,	TRANS_SOCKET_INET6_INDEX },
#endif /* IPv6 */
    { &_XSERVTransSocketINETFuncs,	TRANS_SOCKET_INET_INDEX },
#if defined(UNIXCONN)
    { &_XSERVTransSocketLocalFuncs,	TRANS_SOCKET_LOCAL_INDEX },
    { &_XSERVTransSocketUNIXFuncs,	TRANS_SOCKET_UNIX_INDEX },
#endif /* UNIXCONN */
};

#define NUMTRANS	(sizeof(Xtransports)/sizeof(Xtransport_table))

/*
 * These are a few utility function used by the public interface functions.
 */
void _XSERVTransFreeConnInfo (XtransConnInfo ciptr)

{
    prmsg (3,"FreeConnInfo(%p)\n", (void *) ciptr);

    if (ciptr->addr)
	free (ciptr->addr);

    if (ciptr->peeraddr)
	free (ciptr->peeraddr);

    if (ciptr->port)
	free (ciptr->port);

    free (ciptr);
}


#define PROTOBUFSIZE	20

static Xtransport *
_XSERVTransSelectTransport (const char *protocol)

{
#ifndef HAVE_STRCASECMP
    char 	protobuf[PROTOBUFSIZE];
#endif

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

#ifndef HAVE_STRCASECMP
    /*
     * Force Protocol to be lowercase as a way of doing
     * a case insensitive match.
     */

    strncpy (protobuf, protocol, PROTOBUFSIZE - 1);
    protobuf[PROTOBUFSIZE-1] = '\0';

    for (unsigned int i = 0; i < PROTOBUFSIZE && protobuf[i] != '\0'; i++)
	if (isupper ((unsigned char)protobuf[i]))
	    protobuf[i] = tolower ((unsigned char)protobuf[i]);
#endif

    /* Look at all of the configured protocols */

    for (unsigned int i = 0; i < NUMTRANS; i++)
    {
#ifndef HAVE_STRCASECMP
	if (!strcmp (protobuf, Xtransports[i].transport->TransName))
#else
	if (!strcasecmp (protocol, Xtransports[i].transport->TransName))
#endif
	    return Xtransports[i].transport;
    }

    return NULL;
}

static int
_XSERVTransParseAddress (const char *address,
                     char **protocol, char **host, char **port)

{
    /*
     * For the font library, the address is a string formatted
     * as "protocol/host:port[/catalogue]".  Note that the catologue
     * is optional.  At this time, the catologue info is ignored, but
     * we have to parse it anyways.
     *
     * Other than fontlib, the address is a string formatted
     * as "protocol/host:port".
     *
     * If the protocol part is missing, then assume TCP.
     * If the protocol part and host part are missing, then assume local.
     * If a "::" is found then assume DNET.
     */

    char	*mybuf, *tmpptr = NULL;
    const char	*_protocol = NULL;
    const char	*_host, *_port;
    char	*_host_buf;
    int		_host_len;

    prmsg (3,"ParseAddress(%s)\n", address);

    /* First, check for AF_UNIX socket paths */
    if (address[0] == '/') {
        _protocol = "local";
        _host = "";
        _port = address;
    } else
#ifdef HAVE_LAUNCHD
    /* launchd sockets will look like 'local//tmp/launch-XgkNns/:0' */
    if(!strncmp(address,"local//",7)) {
        _protocol="local";
        _host="";
        _port=address+6;
    } else
#endif
    if (!strncmp(address, "unix:", 5)) {
        _protocol = "local";
        _host = "";
        _port = address + 5;
    }
    if (_protocol)
        goto done_parsing;

    /* Copy the string so it can be changed */

    tmpptr = mybuf = strdup (address);

    /* Parse the string to get each component */

    /* Get the protocol part */

    _protocol = mybuf;


    if ((mybuf == NULL) ||
        ( ((mybuf = strchr (mybuf, '/')) == NULL) &&
          ((mybuf = strrchr (tmpptr, ':')) == NULL) ) )
    {
	/* address is in a bad format */
	*protocol = NULL;
	*host = NULL;
	*port = NULL;
	free (tmpptr);
	return 0;
    }

    if (*mybuf == ':')
    {
	/*
	 * If there is a hostname, then assume tcp, otherwise
	 * it must be local.
	 */
	if (mybuf == tmpptr)
	{
	    /* There is neither a protocol or host specified */
	    _protocol = "local";
	}
	else
	{
	    /* There is a hostname specified */
	    _protocol = "tcp";
	    mybuf = tmpptr;	/* reset to the beginning of the host ptr */
	}
    }
    else
    {
	/* *mybuf == '/' */

	*mybuf ++= '\0'; /* put a null at the end of the protocol */

	if (strlen(_protocol) == 0)
	{
	    /*
	     * If there is a hostname, then assume tcp, otherwise
	     * it must be local.
	     */
	    if (*mybuf != ':')
		_protocol = "tcp";
	    else
		_protocol = "local";
	}
    }

    /* Get the host part */

    _host = _host_buf = mybuf;

    if ((mybuf = strrchr (mybuf,':')) == NULL)
    {
	*protocol = NULL;
	*host = NULL;
	*port = NULL;
	free (tmpptr);
	return 0;
    }

    *mybuf ++= '\0';

    _host_len = strlen(_host);

    struct xhostname hn;
    if (_host_len == 0)
    {
        xhostname(&hn);
        _host = hn.name;
    }
#ifdef IPv6
    /* hostname in IPv6 [numeric_addr]:0 form? */
    else if ( (_host_len > 3) &&
      ((strcmp(_protocol, "tcp") == 0) || (strcmp(_protocol, "inet6") == 0))
      && (_host_buf[0] == '[') && (_host_buf[_host_len - 1] == ']') ) {
	struct sockaddr_in6 sin6;

	_host_buf[_host_len - 1] = '\0';

	/* Verify address is valid IPv6 numeric form */
	if (inet_pton(AF_INET6, _host + 1, &sin6) == 1) {
	    /* It is. Use it as such. */
	    _host++;
	    _protocol = "inet6";
	} else {
	    /* It's not, restore it just in case some other code can use it. */
	    _host_buf[_host_len - 1] = ']';
	}
    }
#endif


    /* Get the port */

    _port = mybuf;

done_parsing:
    /*
     * Now that we have all of the components, allocate new
     * string space for them.
     */

    if ((*protocol = strdup (_protocol)) == NULL)
    {
	/* Malloc failed */
	*port = NULL;
	*host = NULL;
	*protocol = NULL;
	free (tmpptr);
	return 0;
    }

    if ((*host = strdup (_host)) == NULL)
    {
	/* Malloc failed */
	*port = NULL;
	*host = NULL;
	free (*protocol);
	*protocol = NULL;
	free (tmpptr);
	return 0;
    }

    if ((*port = strdup (_port)) == NULL)
    {
	/* Malloc failed */
	*port = NULL;
	free (*host);
	*host = NULL;
	free (*protocol);
	*protocol = NULL;
	free (tmpptr);
	return 0;
    }

    free (tmpptr);

    return 1;
}


/*
 * _XSERVTransOpen does all of the real work opening a connection. The only
 * funny part about this is the type parameter which is used to decide which
 * type of open to perform.
 */

static XtransConnInfo
_XSERVTransOpen (int type, const char *address)

{
    char 		*protocol = NULL, *host = NULL, *port = NULL;
    XtransConnInfo	ciptr = NULL;
    Xtransport		*thistrans;

    prmsg (2,"Open(%d,%s)\n", type, address);

    ossock_init();

    /* Parse the Address */

    if (_XSERVTransParseAddress (address, &protocol, &host, &port) == 0)
    {
	prmsg (1,"Open: Unable to Parse address %s\n", address);
	return NULL;
    }

    /* Determine the transport type */

    if ((thistrans = _XSERVTransSelectTransport (protocol)) == NULL)
    {
	prmsg (1,"Open: Unable to find transport for %s\n",
	       protocol);

	free (protocol);
	free (host);
	free (port);
	return NULL;
    }

    /* Open the transport */

    switch (type)
    {
    case XTRANS_OPEN_COTS_CLIENT:
	break;
    case XTRANS_OPEN_COTS_SERVER:
	ciptr = thistrans->OpenCOTSServer(thistrans, protocol, host, port);
	break;
    default:
	prmsg (1,"Open: Unknown Open type %d\n", type);
    }

    if (ciptr == NULL)
    {
	if (!(thistrans->flags & TRANS_DISABLED))
	{
	    prmsg (1,"Open: transport open failed for %s/%s:%s\n",
	           protocol, host, port);
	}
	free (protocol);
	free (host);
	free (port);
	return NULL;
    }

    ciptr->transptr = thistrans;
    ciptr->port = port;			/* We need this for _XSERVTransReopen */

    free (protocol);
    free (host);

    return ciptr;
}

/*
 * We might want to create an XtransConnInfo object based on a previously
 * opened connection.  For example, the font server may clone itself and
 * pass file descriptors to the parent.
 */

static XtransConnInfo
_XSERVTransReopen (int type, int trans_id, int fd, const char *port)

{
    XtransConnInfo	ciptr = NULL;
    Xtransport		*thistrans = NULL;
    char		*save_port;

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

    /* Determine the transport type */

    for (unsigned int i = 0; i < NUMTRANS; i++)
    {
	if (Xtransports[i].transport_id == trans_id)
	{
	    thistrans = Xtransports[i].transport;
	    break;
	}
    }

    if (thistrans == NULL)
    {
	prmsg (1,"Reopen: Unable to find transport id %d\n",
	       trans_id);

	return NULL;
    }

    if ((save_port = strdup (port)) == NULL)
    {
	prmsg (1,"Reopen: Unable to malloc port string\n");

	return NULL;
    }

    /* Get a new XtransConnInfo object */

    switch (type)
    {
    case XTRANS_OPEN_COTS_SERVER:
	ciptr = thistrans->ReopenCOTSServer(thistrans, fd, port);
	break;
    default:
	prmsg (1,"Reopen: Bad Open type %d\n", type);
    }

    if (ciptr == NULL)
    {
	prmsg (1,"Reopen: transport open failed\n");
	free (save_port);
	return NULL;
    }

    ciptr->transptr = thistrans;
    ciptr->port = save_port;

    return ciptr;
}

/*
 * These are the public interfaces to this Transport interface.
 * These are the only functions that should have knowledge of the transport
 * table.
 */

XtransConnInfo
_XSERVTransOpenCOTSServer (const char *address)

{
    prmsg (2,"OpenCOTSServer(%s)\n", address);
    return _XSERVTransOpen (XTRANS_OPEN_COTS_SERVER, address);
}

XtransConnInfo
_XSERVTransReopenCOTSServer (int trans_id, int fd, const char *port)

{
    prmsg (2,"ReopenCOTSServer(%d, %d, %s)\n", trans_id, fd, port);
    return _XSERVTransReopen (XTRANS_OPEN_COTS_SERVER, trans_id, fd, port);
}

int _XSERVTransNonBlock(XtransConnInfo ciptr)
{
    int	fd = ciptr->fd;
    int	ret = 0;

#if defined(O_NONBLOCK)
	    ret = fcntl (fd, F_GETFL, 0);
	    if (ret != -1)
		ret = fcntl (fd, F_SETFL, ret | O_NONBLOCK);
#else
#ifdef FIOSNBIO
	{
	    int arg;
	    arg = 1;
	    ret = ossock_ioctl (fd, FIOSNBIO, &arg);
	}
#else
#if defined(WIN32)
	{
	    u_long arg_ret = 1;
/* IBM TCP/IP understands this option too well: it causes _XSERVTransRead to fail
 * eventually with EWOULDBLOCK */
	    ret = ossock_ioctl (fd, FIONBIO, &arg_ret);
	}
#else
	    ret = fcntl (fd, F_GETFL, 0);
	    ret = fcntl (fd, F_SETFL, ret | O_NDELAY);
#endif /* WIN32 */
#endif /* FIOSNBIO */
#endif /* O_NONBLOCK */

    return ret;
}

int _XSERVTransCreateListener (XtransConnInfo ciptr, const char *port, unsigned int flags)
{
    return ciptr->transptr->CreateListener (ciptr, port, flags);
}

int _XSERVTransReceived (const char * protocol)
{
   Xtransport *trans;
   int i = 0, ret = 0;

   prmsg (5, "Received(%s)\n", protocol);

   if ((trans = _XSERVTransSelectTransport(protocol)) == NULL)
   {
	prmsg (1,"Received: unable to find transport: %s\n",
	       protocol);

	return -1;
   }
   if (trans->flags & TRANS_ALIAS) {
       if (trans->nolisten)
	   while (trans->nolisten[i]) {
	       ret |= _XSERVTransReceived(trans->nolisten[i]);
	       i++;
       }
   }

   trans->flags |= TRANS_RECEIVED;
   return ret;
}

int _XSERVTransNoListen (const char * protocol)
{
   Xtransport *trans;
   int i = 0, ret = 0;

   if ((trans = _XSERVTransSelectTransport(protocol)) == NULL)
   {
	prmsg (1,"TransNoListen: unable to find transport: %s\n",
	       protocol);

	return -1;
   }
   if (trans->flags & TRANS_ALIAS) {
       if (trans->nolisten)
	   while (trans->nolisten[i]) {
	       ret |= _XSERVTransNoListen(trans->nolisten[i]);
	       i++;
       }
   }

   trans->flags |= TRANS_NOLISTEN;
   return ret;
}

int _XSERVTransListen (const char * protocol)
{
   Xtransport *trans;
   int i = 0, ret = 0;

   if ((trans = _XSERVTransSelectTransport(protocol)) == NULL)
   {
	prmsg (1,"TransListen: unable to find transport: %s\n",
	       protocol);

	return -1;
   }
   if (trans->flags & TRANS_ALIAS) {
       if (trans->nolisten)
	   while (trans->nolisten[i]) {
	       ret |= _XSERVTransListen(trans->nolisten[i]);
	       i++;
       }
   }

   trans->flags &= ~TRANS_NOLISTEN;
   return ret;
}

int _XSERVTransIsListening (const char * protocol)
{
   Xtransport *trans;

   if ((trans = _XSERVTransSelectTransport(protocol)) == NULL)
   {
	prmsg (1,"TransIsListening: unable to find transport: %s\n",
	       protocol);

	return 0;
   }

   return !(trans->flags & TRANS_NOLISTEN);
}

int _XSERVTransResetListener (XtransConnInfo ciptr)
{
    if (ciptr->transptr->ResetListener)
	return ciptr->transptr->ResetListener (ciptr);
    else
	return TRANS_RESET_NOOP;
}

XtransConnInfo _XSERVTransAccept (XtransConnInfo ciptr)
{
    XtransConnInfo	newciptr;

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

    newciptr = ciptr->transptr->Accept(ciptr);

    if (newciptr)
	newciptr->transptr = ciptr->transptr;

    return newciptr;
}

int _XSERVTransRead (XtransConnInfo ciptr, char *buf, int size)
{
    return ciptr->transptr->Read (ciptr, buf, size);
}

ssize_t _XSERVTransWrite (XtransConnInfo ciptr, const char *buf, size_t size)
{
    return ciptr->transptr->Write (ciptr, buf, size);
}

#if XTRANS_SEND_FDS
int _XSERVTransSendFd (XtransConnInfo ciptr, int fd, int do_close)
{
    return ciptr->transptr->SendFd(ciptr, fd, do_close);
}

int _XSERVTransRecvFd (XtransConnInfo ciptr)
{
    return ciptr->transptr->RecvFd(ciptr);
}
#endif

int _XSERVTransDisconnect (XtransConnInfo ciptr)
{
    return ciptr->transptr->Disconnect (ciptr);
}

int _XSERVTransClose (XtransConnInfo ciptr)
{
    int ret;

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

    ret = ciptr->transptr->Close (ciptr);

    _XSERVTransFreeConnInfo (ciptr);

    return ret;
}

int _XSERVTransCloseForCloning (XtransConnInfo ciptr)
{
    int ret;

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

    ret = ciptr->transptr->CloseForCloning (ciptr);

    _XSERVTransFreeConnInfo (ciptr);

    return ret;
}

int _XSERVTransIsLocal (XtransConnInfo ciptr)
{
    return (ciptr->family == AF_UNIX);
}

int _XSERVTransGetPeerAddr (XtransConnInfo ciptr, int *familyp, int *addrlenp,
		    Xtransaddr **addrp)
{
    prmsg (2,"GetPeerAddr(%d)\n", ciptr->fd);

    *familyp = ciptr->family;
    *addrlenp = ciptr->peeraddrlen;

    if ((*addrp = malloc (ciptr->peeraddrlen)) == NULL)
    {
	prmsg (1,"GetPeerAddr: malloc failed\n");
	return -1;
    }
    memcpy(*addrp, ciptr->peeraddr, ciptr->peeraddrlen);

    return 0;
}

int _XSERVTransGetConnectionNumber (XtransConnInfo ciptr)
{
    return ciptr->fd;
}

/*
 * These functions are really utility functions, but they require knowledge
 * of the internal data structures, so they have to be part of the Transport
 * Independent API.
 */
static int
complete_network_count (void)
{
    int count = 0;
    int found_local = 0;

    /*
     * For a complete network, we only need one LOCALCONN transport to work
     */

    for (unsigned int i = 0; i < NUMTRANS; i++)
    {
	if (Xtransports[i].transport->flags & TRANS_ALIAS
   	 || Xtransports[i].transport->flags & TRANS_NOLISTEN)
	    continue;

	if (Xtransports[i].transport->flags & TRANS_LOCAL)
	    found_local = 1;
	else
	    count++;
    }

    return (count + found_local);
}


static int
receive_listening_fds(const char* port, XtransConnInfo* temp_ciptrs,
                      uint32_t* count_ret)

{
#ifdef HAVE_SYSTEMD_DAEMON
    XtransConnInfo ciptr;
    int i, systemd_listen_fds;

    systemd_listen_fds = sd_listen_fds(1);
    if (systemd_listen_fds < 0)
    {
        prmsg (1, "receive_listening_fds: sd_listen_fds error: %s\n",
               strerror(-systemd_listen_fds));
        return -1;
    }

    for (i = 0; i < systemd_listen_fds && *count_ret < (int)NUMTRANS; i++)
    {
        struct sockaddr_storage a;
        int ti;
        const char* tn;
        socklen_t al;

        al = sizeof(a);
        if (getsockname(i + SD_LISTEN_FDS_START, (struct sockaddr*)&a, &al) < 0) {
            prmsg (1, "receive_listening_fds: getsockname error: %s\n",
                   strerror(errno));
            return -1;
        }

        switch (a.ss_family)
        {
        case AF_UNIX:
            ti = TRANS_SOCKET_UNIX_INDEX;
            if (*((struct sockaddr_un*)&a)->sun_path == '\0' &&
                al > sizeof(sa_family_t))
                tn = "local";
            else
                tn = "unix";
            break;
        case AF_INET:
            ti = TRANS_SOCKET_INET_INDEX;
            tn = "inet";
            break;
#ifdef IPv6
        case AF_INET6:
            ti = TRANS_SOCKET_INET6_INDEX;
            tn = "inet6";
            break;
#endif /* IPv6 */
        default:
            prmsg (1, "receive_listening_fds:"
                   "Got unknown socket address family\n");
            return -1;
        }

        ciptr = _XSERVTransReopenCOTSServer(ti, i + SD_LISTEN_FDS_START, port);
        if (!ciptr)
        {
            prmsg (1, "receive_listening_fds:"
                   "Got NULL while trying to reopen socket received from systemd.\n");
            return -1;
        }

        prmsg (5, "receive_listening_fds: received listener for %s, %d\n",
               tn, ciptr->fd);
        temp_ciptrs[(*count_ret)++] = ciptr;
        _XSERVTransReceived(tn);
    }
#endif /* HAVE_SYSTEMD_DAEMON */
    return 0;
}

#ifdef XQUARTZ_EXPORTS_LAUNCHD_FD
extern int xquartz_launchd_fd;
#endif

int _XSERVTransMakeAllCOTSServerListeners (const char *port, int *partial,
                                   uint32_t *count_ret, XtransConnInfo **ciptrs_ret)
{
    char		buffer[256]; /* ??? What size ?? */
    XtransConnInfo	ciptr, temp_ciptrs[NUMTRANS] = { NULL };
    int			status, j;

#ifdef IPv6
    int		ipv6_succ = 0;
#endif
    prmsg (2,"MakeAllCOTSServerListeners(%s,%p)\n",
	   port ? port : "NULL", (void *) ciptrs_ret);

    *count_ret = 0;

#ifdef XQUARTZ_EXPORTS_LAUNCHD_FD
    fprintf(stderr, "Launchd socket fd: %d\n", xquartz_launchd_fd);
    if(xquartz_launchd_fd != -1) {
        if((ciptr = _XSERVTransReopenCOTSServer(TRANS_SOCKET_LOCAL_INDEX,
                                           xquartz_launchd_fd, getenv("DISPLAY"))))==NULL)
            fprintf(stderr,"Got NULL while trying to Reopen launchd port\n");
        else
            temp_ciptrs[(*count_ret)++] = ciptr;
    }
#endif

    if (receive_listening_fds(port, temp_ciptrs, count_ret) < 0)
	return -1;

    for (unsigned int i = 0; i < NUMTRANS; i++)
    {
	Xtransport *trans = Xtransports[i].transport;
	unsigned int flags = 0;

	if (trans->flags&TRANS_ALIAS || trans->flags&TRANS_NOLISTEN ||
	    trans->flags&TRANS_RECEIVED)
	    continue;

	snprintf(buffer, sizeof(buffer), "%s/:%s",
		 trans->TransName, port ? port : "");

	prmsg (5,"MakeAllCOTSServerListeners: opening %s\n",
	       buffer);

	if ((ciptr = _XSERVTransOpenCOTSServer(buffer)) == NULL)
	{
	    if (trans->flags & TRANS_DISABLED)
		continue;

	    prmsg (1,
	  "MakeAllCOTSServerListeners: failed to open listener for %s\n",
		  trans->TransName);
	    continue;
	}
#ifdef IPv6
		if ((Xtransports[i].transport_id == TRANS_SOCKET_INET_INDEX
		     && ipv6_succ))
		    flags |= ADDR_IN_USE_ALLOWED;
#endif

	if ((status = _XSERVTransCreateListener (ciptr, port, flags)) < 0)
	{
            if (*partial != 0)
		continue;

	    if (status == TRANS_ADDR_IN_USE)
	    {
		/*
		 * We failed to bind to the specified address because the
		 * address is in use.  It must be that a server is already
		 * running at this address, and this function should fail.
		 */

		prmsg (1,
		"MakeAllCOTSServerListeners: server already running\n");

		for (j = 0; j < *count_ret; j++)
		    if (temp_ciptrs[j] != NULL)
			_XSERVTransClose (temp_ciptrs[j]);

		*count_ret = 0;
		*ciptrs_ret = NULL;
		*partial = 0;
		return -1;
	    }
	    else
	    {
		prmsg (1,
	"MakeAllCOTSServerListeners: failed to create listener for %s\n",
		  trans->TransName);

		continue;
	    }
	}

#ifdef IPv6
	if (Xtransports[i].transport_id == TRANS_SOCKET_INET6_INDEX)
	    ipv6_succ = 1;
#endif

	prmsg (5,
	      "MakeAllCOTSServerListeners: opened listener for %s, %d\n",
	      trans->TransName, ciptr->fd);

	temp_ciptrs[*count_ret] = ciptr;
	(*count_ret)++;
    }

    *partial = (*count_ret < complete_network_count());

    prmsg (5,
     "MakeAllCOTSServerListeners: partial=%d, actual=%d, complete=%d \n",
	*partial, *count_ret, complete_network_count());

    if (*count_ret > 0)
    {
	if ((*ciptrs_ret = malloc (
	    *count_ret * sizeof (XtransConnInfo))) == NULL)
	{
	    return -1;
	}

	for (int i = 0; i < *count_ret; i++)
	{
	    (*ciptrs_ret)[i] = temp_ciptrs[i];
	}
    }
    else
	*ciptrs_ret = NULL;

    return 0;
}