workspace/kdm/backend/streams.c

   1 /*
   2
   3 Copyright 1988, 1998  The Open Group
   4 Copyright 2002,2004 Oswald Buddenhagen <ossi@kde.org>
   5
   6 Permission to use, copy, modify, distribute, and sell this software and its
   7 documentation for any purpose is hereby granted without fee, provided that
   8 the above copyright notice appear in all copies and that both that
   9 copyright notice and this permission notice appear in supporting
  10 documentation.
  11
  12 The above copyright notice and this permission notice shall be included
  13 in all copies or substantial portions of the Software.
  14
  15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  16 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  18 IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21 OTHER DEALINGS IN THE SOFTWARE.
  22
  23 Except as contained in this notice, the name of a copyright holder shall
  24 not be used in advertising or otherwise to promote the sale, use or
  25 other dealings in this Software without prior written authorization
  26 from the copyright holder.
  27
  28 */
  29
  30 /*
  31  * xdm - display manager daemon
  32  * Author: Keith Packard, MIT X Consortium
  33  *
  34  * streams.c - Support for STREAMS
  35  */
  36
  37 #include "dm.h"
  38
  39 #if defined(XDMCP) && defined(STREAMSCONN)
  40
  41 #include "dm_error.h"
  42
  43 #include <fcntl.h>
  44 #include <tiuser.h>
  45 #include <netconfig.h>
  46 #include <netdir.h>
  47
  48 static int xdmcpFd = -1, currentRequestPort;
  49
  50 void
  51 updateListenSockets( void )
  52 {
  53         struct t_bind bind_addr;
  54         struct netconfig *nconf;
  55         struct nd_hostserv service;
  56         struct nd_addrlist *servaddrs;
  57         char bindbuf[15];
  58         int it;
  59
  60         if (currentRequestPort == requestPort)
  61                 return;
  62         currentRequestPort = requestPort;
  63
  64         if (xdmcpFd != -1) {
  65                 closeNclearCloseOnFork( xdmcpFd );
  66                 unregisterInput( xdmcpFd );
  67                 xdmcpFd = -1;
  68         }
  69
  70         if (!requestPort)
  71                 return;
  72
  73         debug( "creating UDP stream %d\n", requestPort );
  74
  75         nconf = getnetconfigent( "udp" );
  76         if (!nconf) {
  77                 t_error( "getnetconfigent udp" );
  78                 return;
  79         }
  80
  81         xdmcpFd = t_open( nconf->nc_device, O_RDWR, NULL );
  82         if (xdmcpFd == -1) {
  83                 logError( "XDMCP stream creation failed\n" );
  84                 t_error( "CreateWellKnownSockets(xdmcpFd): t_open failed" );
  85                 return;
  86         }
  87
  88         service.h_host = HOST_SELF;
  89         sprintf( bindbuf, "%d", requestPort );
  90         service.h_serv = bindbuf;
  91         netdir_getbyname( nconf, &service, &servaddrs );
  92         freenetconfigent( nconf );
  93
  94         bind_addr.qlen = 5;
  95         bind_addr.addr.buf = servaddrs->n_addrs[0].buf;
  96         bind_addr.addr.len = servaddrs->n_addrs[0].len;
  97         bind_addr.addr.maxlen = servaddrs->n_addrs[0].len;
  98         it = t_bind( xdmcpFd, &bind_addr, &bind_addr );
  99         netdir_free( (char *)servaddrs, ND_ADDRLIST );
 100         if (it < 0) {
 101                 logError( "Error binding UDP port %d\n", requestPort );
 102                 t_error( "CreateWellKnownSockets(xdmcpFd): t_bind failed" );
 103                 t_close( xdmcpFd );
 104                 xdmcpFd = -1;
 105                 return;
 106         }
 107         registerCloseOnFork( xdmcpFd );
 108         registerInput( xdmcpFd );
 109 }
 110
 111 int
 112 anyListenSockets( void )
 113 {
 114         return xdmcpFd != -1;
 115 }
 116
 117 int
 118 processListenSockets( fd_set *reads )
 119 {
 120         if (xdmcpFd >= 0 && FD_ISSET( xdmcpFd, reads )) {
 121                 processRequestSocket( xdmcpFd );
 122                 return True;
 123         }
 124         return False;
 125 }
 126
 127 #endif /* STREAMSCONN && XDMCP */