int
main( int argc, char **argv )
{
int oldpid, oldumask, fd, noDaemonMode;
char *pt, *errorLogFile, **opts;
/* make sure at least world write access is disabled */
if (((oldumask = umask( 022 )) & 002) == 002)
(void)umask( oldumask );
/* give /dev/null as stdin */
if ((fd = open( "/dev/null", O_RDONLY )) > 0) {
dup2( fd, 0 );
close( fd );
}
if (fcntl( 1, F_GETFD ) < 0)
dup2( 0, 1 );
if (fcntl( 2, F_GETFD ) < 0)
dup2( 0, 2 );
if (argv[0][0] == '/') {
if (!StrDup( &progpath, argv[0] ))
Panic( "Out of memory" );
} else
#ifdef __linux__
{
/* note that this will resolve symlinks ... */
int len;
char fullpath[PATH_MAX];
if ((len = readlink( "/proc/self/exe", fullpath, sizeof(fullpath) )) < 0)
Panic( "Invoke with full path specification or mount /proc" );
if (!StrNDup( &progpath, fullpath, len ))
Panic( "Out of memory" );
}
#else
# if 0
Panic( "Must be invoked with full path specification" );
# else
{
char directory[PATH_MAX+1];
if (!getcwd( directory, sizeof(directory) ))
Panic( "Can't find myself (getcwd failed)" );
if (strchr( argv[0], '/' ))
StrApp( &progpath, directory, "/", argv[0], (char *)0 );
else {
int len;
char *path, *pathe, *name, *thenam, nambuf[PATH_MAX+1];
if (!(path = getenv( "PATH" )))
Panic( "Can't find myself (no PATH)" );
len = strlen( argv[0] );
name = nambuf + PATH_MAX - len;
memcpy( name, argv[0], len + 1 );
*--name = '/';
do {
if (!(pathe = strchr( path, ':' )))
pathe = path + strlen( path );
len = pathe - path;
if (!len || (len == 1 && *path == '.')) {
len = strlen( directory );
path = directory;
}
thenam = name - len;
if (thenam >= nambuf) {
memcpy( thenam, path, len );
if (!access( thenam, X_OK ))
goto found;
}
path = pathe;
} while (*path++ != '\0');
Panic( "Can't find myself (not in PATH)" );
found:
if (!StrDup( &progpath, thenam ))
Panic( "Out of memory" );
}
}
# endif
#endif
prog = strrchr( progpath, '/' ) + 1;
#if !defined(HAVE_SETPROCTITLE) && !defined(NOXDMTITLE)
Title = argv[0];
TitleLen = (argv[argc - 1] + strlen( argv[argc - 1] )) - Title;
#endif
/*
* Parse command line options
*/
noDaemonMode = getppid();
errorLogFile = 0;
if (!(opts = Malloc( 2 * sizeof(char *) )))
return 1;
opts[0] = (char *)"";
opts[1] = 0;
while (*++argv) {
if (**argv != '-')
break;
pt = *argv + 1;
if (*pt == '-')
pt++;
if (!strcmp( pt, "help" ) || !strcmp( pt, "h" )) {
printf( "Usage: %s [options] [tty]\n"
" -daemon\t - Daemonize even when started by init\n"
" -nodaemon\t - Don't daemonize even when started from command line\n"
" -config <file> - Use alternative master configuration file\n"
" -xrm <res>\t - Override frontend-specific resource\n"
" -error <file>\t - Use alternative log file\n"
" -debug <num>\t - Debug option bitfield:\n"
"\t\t\t0x1 - core log\n"
"\t\t\t0x2 - config reader log\n"
"\t\t\t0x4 - greeter log\n"
"\t\t\t0x8 - IPC log\n"
"\t\t\t0x10 - session sub-daemon post-fork delay\n"
"\t\t\t0x20 - config reader post-start delay\n"
"\t\t\t0x40 - greeter post-start delay\n"
"\t\t\t0x80 - don't use syslog\n"
"\t\t\t0x100 - core Xauth log\n"
"\t\t\t0x400 - valgrind config reader and greeter\n"
"\t\t\t0x800 - strace config reader and greeter\n"
, prog );
exit( 0 );
} else if (!strcmp( pt, "daemon" ))
noDaemonMode = 0;
else if (!strcmp( pt, "nodaemon" ))
noDaemonMode = 1;
else if (argv[1] && !strcmp( pt, "config" ))
StrDup( opts, *++argv );
else if (argv[1] && !strcmp( pt, "xrm" ))
opts = addStrArr( opts, *++argv, -1 );
else if (argv[1] && !strcmp( pt, "debug" ))
sscanf( *++argv, "%i", &debugLevel );
else if (argv[1] && (!strcmp( pt, "error" ) || !strcmp( pt, "logfile" )))
errorLogFile = *++argv;
else {
fprintf( stderr, "\"%s\" is an unknown option or is missing a parameter\n", *argv );
exit( 1 );
}
}
/*
* Only allow root to run in non-debug mode to avoid problems
*/
if (!debugLevel && getuid()) {
fprintf( stderr, "Only root wants to run %s\n", prog );
exit( 1 );
}
InitErrorLog( errorLogFile );
if (noDaemonMode != 1)
BecomeDaemon();
/*
* Step 1 - load configuration parameters
*/
if (!InitResources( opts ) || ScanConfigs( FALSE ) < 0)
LogPanic( "Config reader failed. Aborting ...\n" );
/* SUPPRESS 560 */
if ((oldpid = StorePid())) {
if (oldpid == -1)
LogError( "Can't create/lock pid file %s\n", pidFile );
else
LogError( "Can't lock pid file %s, another xdm is running (pid %d)\n",
pidFile, oldpid );
exit( 1 );
}
#ifdef NEED_ENTROPY
AddOtherEntropy();
#endif
/*
* We used to clean up old authorization files here. As authDir is
* supposed to be /var/run/xauth or /tmp, we needn't to care for it.
*/
#ifdef XDMCP
init_session_id();
#else
Debug( "not compiled for XDMCP\n" );
#endif
if (pipe( signalFds ))
LogPanic( "Unable to create signal notification pipe.\n" );
RegisterInput( signalFds[0] );
RegisterCloseOnFork( signalFds[0] );
RegisterCloseOnFork( signalFds[1] );
(void)Signal( SIGTERM, SigHandler );
(void)Signal( SIGINT, SigHandler );
(void)Signal( SIGHUP, SigHandler );
(void)Signal( SIGCHLD, SigHandler );
(void)Signal( SIGUSR1, SigHandler );
/*
* Step 2 - run a sub-daemon for each entry
*/
#ifdef XDMCP
UpdateListenSockets();
#endif
openCtrl( 0 );
MainLoop();
closeCtrl( 0 );
if (sdRec.how) {
commitBootOption();
if (Fork() <= 0) {
char *cmd = sdRec.how == SHUT_HALT ? cmdHalt : cmdReboot;
execute( parseArgs( (char **)0, cmd ), (char **)0 );
LogError( "Failed to execute shutdown command %\"s\n", cmd );
exit( 1 );
} else {
sigset_t mask;
sigemptyset( &mask );
sigaddset( &mask, SIGCHLD );
sigaddset( &mask, SIGHUP );
sigsuspend( &mask );
}
}
Debug( "nothing left to do, exiting\n" );
return 0;
}
int
main (int argc, char **argv)
{
int oldpid;
mode_t oldumask;
char cmdbuf[1024];
/* make sure at least world write access is disabled */
if (((oldumask = umask(022)) & 002) == 002)
(void) umask (oldumask);
#ifndef NOXDMTITLE
Title = argv[0];
TitleLen = (argv[argc - 1] + strlen(argv[argc - 1])) - Title;
#endif
#ifdef USESECUREWARE
set_auth_parameters (argc, argv);
#endif
/*
* Step 1 - load configuration parameters
*/
InitResources (argc, argv);
SetConfigFileTime ();
LoadDMResources ();
/*
* Only allow root to run in non-debug mode to avoid problems
*/
if (debugLevel == 0 && getuid() != 0)
{
fprintf (stderr, "Only root wants to run %s\n", argv[0]);
exit (1);
}
if (debugLevel == 0 && daemonMode)
BecomeDaemon ();
if (debugLevel == 0)
InitErrorLog ();
if (debugLevel >= 10)
nofork_session = 1;
/* SUPPRESS 560 */
if ((oldpid = StorePid ()))
{
if (oldpid == -1)
LogError ("Can't create/lock pid file %s\n", pidFile);
else
LogError ("Can't lock pid file %s, another xdm is running (pid %d)\n",
pidFile, oldpid);
exit (1);
}
LogInfo ("Starting\n");
if (atexit (RemovePid))
LogError ("could not register RemovePid() with atexit()\n");
if (nofork_session == 0) {
/* Clean up any old Authorization files */
/* AUD: all good? */
snprintf(cmdbuf, sizeof(cmdbuf), "/bin/rm -f %s/authdir/authfiles/A*", authDir);
system(cmdbuf);
}
#if!defined(HAVE_ARC4RANDOM) && !defined(DEV_RANDOM)
AddOtherEntropy ();
#endif
#ifdef XDMCP
init_session_id ();
CreateWellKnownSockets ();
#else
Debug ("xdm: not compiled for XDMCP\n");
#endif
parent_pid = getpid ();
(void) Signal (SIGTERM, StopAll);
(void) Signal (SIGINT, StopAll);
/*
* Step 2 - Read /etc/Xservers and set up
* the socket.
*
* Keep a sub-daemon running
* for each entry
*/
SetAccessFileTime ();
#ifdef XDMCP
ScanAccessDatabase ();
UpdateListenSockets ();
#endif
ScanServers ();
StartDisplays ();
#if !defined(HAVE_ARC4RANDOM) && !defined(DEV_RANDOM)
AddOtherEntropy();
#endif
(void) Signal (SIGHUP, RescanNotify);
#ifndef UNRELIABLE_SIGNALS
(void) Signal (SIGCHLD, ChildNotify);
#endif
Debug ("startup successful; entering main loop\n");
while (
#ifdef XDMCP
AnyWellKnownSockets() ||
#endif
AnyDisplaysLeft ())
{
if (Rescan)
{
RescanServers ();
Rescan = 0;
}
#if defined(UNRELIABLE_SIGNALS) || !defined(XDMCP)
WaitForChild ();
#else
WaitForSomething ();
#endif
}
Debug ("Nothing left to do, exiting\n");
LogInfo ("Exiting\n");
exit(0);
/*NOTREACHED*/
}
