/* Copyright 1988, 1998 The Open Group Copyright 2001,2003,2005 Oswald Buddenhagen <ossi@kde.org> 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 COPYRIGHT HOLDERS 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 a copyright holder 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 copyright holder. */ /* * xdm - display manager daemon * Author: Keith Packard, MIT X Consortium * * server.c - manage the X server */ #include "dm.h" #include "dm_error.h" #include "dm_socket.h" #include <X11/Xlib.h> #include <stdio.h> #include <stdlib.h> #include <signal.h> struct display *startingServer; time_t serverTimeout = TO_INF; char ** PrepServerArgv( struct display *d, const char *args ) { char **argv; #ifdef HAVE_VTS char vtstr[8]; #endif if (!(argv = parseArgs( 0, d->serverCmd )) || !(argv = parseArgs( argv, args )) || !(argv = addStrArr( argv, d->name, -1 ))) exit( 47 ); #ifdef HAVE_VTS if (d->serverVT && !(argv = addStrArr( argv, vtstr, sprintf( vtstr, "vt%d", d->serverVT ) ))) exit( 47 ); #endif return argv; } static void StartServerOnce( void ) { struct display *d = startingServer; char **argv; int pid; Debug( "StartServerOnce for %s, try %d\n", d->name, ++d->startTries ); d->serverStatus = starting; switch (pid = Fork()) { case 0: argv = PrepServerArgv( d, d->serverArgsLocal ); if (d->authFile) { if (!(argv = addStrArr( argv, "-auth", 5 )) || !(argv = addStrArr( argv, d->authFile, -1 ))) exit( 47 ); } Debug( "exec %\"[s\n", argv ); /* * give the server SIGUSR1 ignored, * it will notice that and send SIGUSR1 * when ready */ (void)Signal( SIGUSR1, SIG_IGN ); (void)execv( argv[0], argv ); LogError( "X server %\"s cannot be executed\n", argv[0] ); /* Let's try again with some standard paths */ argv[0] = (char *)realloc(argv[0], strlen("/usr/X11R6/bin/X") + 1); if (argv[0] != NULL) { argv[0] = "/usr/X11R6/bin/X"; Debug( "exec %\"[s\n", argv ); (void)execv( argv[0], argv ); LogError( "X server %\"s cannot be executed\n", argv[0] ); argv[0] = "/usr/bin/X"; /* Shorter than the previous file name */ Debug( "exec %\"[s\n", argv ); (void)execv( argv[0], argv ); LogError( "X server %\"s cannot be executed\n", argv[0] ); } exit( 47 ); case -1: LogError( "X server fork failed\n" ); StartServerFailed(); break; default: Debug( "X server forked, pid %d\n", pid ); d->serverPid = pid; serverTimeout = d->serverTimeout + now; break; } } void StartServer( struct display *d ) { startingServer = d; d->startTries = 0; StartServerOnce(); } void AbortStartServer( struct display *d ) { if (startingServer == d) { if (d->serverStatus != ignore) { d->serverStatus = ignore; serverTimeout = TO_INF; Debug( "aborting X server start\n" ); } startingServer = 0; } } void StartServerSuccess() { struct display *d = startingServer; d->serverStatus = ignore; serverTimeout = TO_INF; Debug( "X server ready, starting session\n" ); StartDisplayP2( d ); } void StartServerFailed() { struct display *d = startingServer; if (!d->serverAttempts || d->startTries < d->serverAttempts) { d->serverStatus = pausing; serverTimeout = d->openDelay + now; } else { d->serverStatus = ignore; serverTimeout = TO_INF; startingServer = 0; LogError( "X server for display %s can't be started," " session disabled\n", d->name ); StopDisplay( d ); } } void StartServerTimeout() { struct display *d = startingServer; switch (d->serverStatus) { case ignore: case awaiting: break; /* cannot happen */ case starting: LogError( "X server startup timeout, terminating\n" ); kill( d->serverPid, d->termSignal ); d->serverStatus = d->termSignal == SIGKILL ? killed : terminated; serverTimeout = d->serverTimeout + now; break; case terminated: LogInfo( "X server termination timeout, killing\n" ); kill( d->serverPid, SIGKILL ); d->serverStatus = killed; serverTimeout = 10 + now; break; case killed: LogInfo( "X server is stuck in D state; leaving it alone\n" ); StartServerFailed(); break; case pausing: StartServerOnce(); break; } } Display *dpy; /* * this code is complicated by some TCP failings. On * many systems, the connect will occasionally hang forever, * this trouble is avoided by setting up a timeout to Longjmp * out of the connect (possibly leaving piles of garbage around * inside Xlib) and give up, terminating the server. */ static Jmp_buf openAbort; /* ARGSUSED */ static void abortOpen( int n ATTR_UNUSED ) { Longjmp( openAbort, 1 ); } #ifdef XDMCP #ifdef STREAMSCONN # include <tiuser.h> #endif static void GetRemoteAddress( struct display *d, int fd ) { char buf[512]; int len = sizeof(buf); #ifdef STREAMSCONN struct netbuf netb; #endif XdmcpDisposeARRAY8( &d->peer ); #ifdef STREAMSCONN netb.maxlen = sizeof(buf); netb.buf = buf; t_getname( fd, &netb, REMOTENAME ); len = 8; /* lucky for us, t_getname returns something that looks like a sockaddr */ #else getpeername( fd, (struct sockaddr *)buf, (void *)&len ); #endif if (len && XdmcpAllocARRAY8( &d->peer, len )) memmove( (char *)d->peer.data, buf, len ); Debug( "got remote address %s %d\n", d->name, d->peer.length ); } #endif /* XDMCP */ static int openErrorHandler( Display *dspl ATTR_UNUSED ) { LogError( "IO Error in XOpenDisplay\n" ); exit( EX_OPENFAILED_DPY ); /*NOTREACHED*/ return (0); } void WaitForServer( struct display *d ) { volatile int i; /* static int i; */ i = 0; do { (void)Signal( SIGALRM, abortOpen ); (void)alarm( (unsigned)d->openTimeout ); if (!Setjmp( openAbort )) { Debug( "before XOpenDisplay(%s)\n", d->name ); errno = 0; (void)XSetIOErrorHandler( openErrorHandler ); dpy = XOpenDisplay( d->name ); #ifdef STREAMSCONN { /* For some reason, the next XOpenDisplay we do is going to fail, so we might as well get that out of the way. There is something broken here. */ Display *bogusDpy = XOpenDisplay( d->name ); Debug( "bogus XOpenDisplay %s\n", bogusDpy ? "succeeded" : "failed" ); if (bogusDpy) XCloseDisplay( bogusDpy ); /* just in case */ } #endif (void)alarm( (unsigned)0 ); (void)Signal( SIGALRM, SIG_DFL ); (void)XSetIOErrorHandler( (int (*)( Display * )) 0 ); Debug( "after XOpenDisplay(%s)\n", d->name ); if (dpy) { #ifdef XDMCP if ((d->displayType & d_location) == dForeign) GetRemoteAddress( d, ConnectionNumber( dpy ) ); #endif RegisterCloseOnFork( ConnectionNumber( dpy ) ); return; } Debug( "OpenDisplay(%s) attempt %d failed: %m\n", d->name, i + 1 ); sleep( (unsigned)d->openDelay ); } else { LogError( "Hung in XOpenDisplay(%s), aborting\n", d->name ); (void)Signal( SIGALRM, SIG_DFL ); break; } } while (++i < d->openRepeat); LogError( "Cannot connect to %s, giving up\n", d->name ); exit( EX_OPENFAILED_DPY ); } void ResetServer( struct display *d ) { if (dpy && (d->displayType & d_origin) != dFromXDMCP) pseudoReset(); } static Jmp_buf pingTime; static void PingLost( void ) { Longjmp( pingTime, 1 ); } /* ARGSUSED */ static int PingLostIOErr( Display *dspl ATTR_UNUSED ) { PingLost(); return 0; } /* ARGSUSED */ static void PingLostSig( int n ATTR_UNUSED ) { PingLost(); } int PingServer( struct display *d ) { int (*oldError)( Display * ); void (*oldSig)( int ); int oldAlarm; oldError = XSetIOErrorHandler( PingLostIOErr ); oldAlarm = alarm( 0 ); oldSig = Signal( SIGALRM, PingLostSig ); (void)alarm( d->pingTimeout * 60 ); if (!Setjmp( pingTime )) { Debug( "ping X server\n" ); XSync( dpy, 0 ); } else { Debug( "X server dead\n" ); (void)alarm( 0 ); (void)Signal( SIGALRM, SIG_DFL ); XSetIOErrorHandler( oldError ); return 0; } (void)alarm( 0 ); (void)Signal( SIGALRM, oldSig ); (void)alarm( oldAlarm ); Debug( "X server alive\n" ); XSetIOErrorHandler( oldError ); return 1; }