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xenocara/xserver/os/utils.c
matthieu fa710f4099 merge xserver 1.4, 1st pass
2007-11-24 19:04:00 +00:00

2292 lines
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/*
Copyright 1987, 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 1987 by Digital Equipment Corporation, Maynard, Massachusetts,
Copyright 1994 Quarterdeck Office Systems.
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 names of Digital and
Quarterdeck not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior
permission.
DIGITAL AND QUARTERDECK DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS, IN NO EVENT SHALL DIGITAL 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.
*/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#ifdef __CYGWIN__
#include <stdlib.h>
#include <signal.h>
#endif
#if defined(WIN32) && !defined(__CYGWIN__)
#include <X11/Xwinsock.h>
#endif
#include <X11/Xos.h>
#include <stdio.h>
#include <time.h>
#if !defined(WIN32) || !defined(__MINGW32__)
#include <sys/time.h>
#include <sys/resource.h>
#endif
#include "misc.h"
#include <X11/X.h>
#define XSERV_t
#define TRANS_SERVER
#define TRANS_REOPEN
#include <X11/Xtrans/Xtrans.h>
#include "input.h"
#include "dixfont.h"
#include "osdep.h"
#include "extension.h"
#ifdef X_POSIX_C_SOURCE
#define _POSIX_C_SOURCE X_POSIX_C_SOURCE
#include <signal.h>
#undef _POSIX_C_SOURCE
#else
#if defined(X_NOT_POSIX) || defined(_POSIX_SOURCE)
#include <signal.h>
#else
#define _POSIX_SOURCE
#include <signal.h>
#undef _POSIX_SOURCE
#endif
#endif
#ifndef WIN32
#include <sys/wait.h>
#endif
#if !defined(SYSV) && !defined(WIN32) && !defined(Lynx) && !defined(QNX4)
#include <sys/resource.h>
#endif
#include <sys/stat.h>
#include <ctype.h> /* for isspace */
#include <stdarg.h>
#if defined(DGUX)
#include <sys/resource.h>
#include <netdb.h>
#endif
#include <stdlib.h> /* for malloc() */
#if defined(TCPCONN) || defined(STREAMSCONN)
# ifndef WIN32
# include <netdb.h>
# endif
#endif
#include "opaque.h"
#ifdef SMART_SCHEDULE
#include "dixstruct.h"
#endif
#ifdef XKB
#include <xkbsrv.h>
#endif
#ifdef XCSECURITY
#include "securitysrv.h"
#endif
#ifdef RENDER
#include "picture.h"
#endif
#ifdef XPRINT
#include "DiPrint.h"
#endif
_X_EXPORT Bool noTestExtensions;
#ifdef BIGREQS
_X_EXPORT Bool noBigReqExtension = FALSE;
#endif
#ifdef COMPOSITE
_X_EXPORT Bool noCompositeExtension = FALSE;
#endif
#ifdef DAMAGE
_X_EXPORT Bool noDamageExtension = FALSE;
#endif
#ifdef DBE
_X_EXPORT Bool noDbeExtension = FALSE;
#endif
#ifdef DPMSExtension
_X_EXPORT Bool noDPMSExtension = FALSE;
#endif
#ifdef EVI
_X_EXPORT Bool noEVIExtension = FALSE;
#endif
#ifdef FONTCACHE
_X_EXPORT Bool noFontCacheExtension = FALSE;
#endif
#ifdef GLXEXT
_X_EXPORT Bool noGlxExtension = FALSE;
#endif
#ifdef SCREENSAVER
_X_EXPORT Bool noScreenSaverExtension = FALSE;
#endif
#ifdef MITSHM
_X_EXPORT Bool noMITShmExtension = FALSE;
#endif
#ifdef MITMISC
_X_EXPORT Bool noMITMiscExtension = FALSE;
#endif
#ifdef MULTIBUFFER
_X_EXPORT Bool noMultibufferExtension = FALSE;
#endif
#ifdef RANDR
_X_EXPORT Bool noRRExtension = FALSE;
#endif
#ifdef RENDER
_X_EXPORT Bool noRenderExtension = FALSE;
#endif
#ifdef SHAPE
_X_EXPORT Bool noShapeExtension = FALSE;
#endif
#ifdef XCSECURITY
_X_EXPORT Bool noSecurityExtension = FALSE;
#endif
#ifdef XSYNC
_X_EXPORT Bool noSyncExtension = FALSE;
#endif
#ifdef TOGCUP
_X_EXPORT Bool noXcupExtension = FALSE;
#endif
#ifdef RES
_X_EXPORT Bool noResExtension = FALSE;
#endif
#ifdef XAPPGROUP
_X_EXPORT Bool noXagExtension = FALSE;
#endif
#ifdef XCMISC
_X_EXPORT Bool noXCMiscExtension = FALSE;
#endif
#ifdef XEVIE
/* Xevie is disabled by default for now until the
* interface is stable */
_X_EXPORT Bool noXevieExtension = TRUE;
#endif
#ifdef XF86BIGFONT
_X_EXPORT Bool noXFree86BigfontExtension = FALSE;
#endif
#ifdef XFreeXDGA
_X_EXPORT Bool noXFree86DGAExtension = FALSE;
#endif
#ifdef XF86DRI
_X_EXPORT Bool noXFree86DRIExtension = FALSE;
#endif
#ifdef XF86MISC
_X_EXPORT Bool noXFree86MiscExtension = FALSE;
#endif
#ifdef XF86VIDMODE
_X_EXPORT Bool noXFree86VidModeExtension = FALSE;
#endif
#ifdef XFIXES
_X_EXPORT Bool noXFixesExtension = FALSE;
#endif
/* |noXkbExtension| is defined in xc/programs/Xserver/xkb/xkbInit.c */
#ifdef PANORAMIX
/* Xinerama is disabled by default unless enabled via +xinerama */
_X_EXPORT Bool noPanoramiXExtension = TRUE;
#endif
#ifdef XINPUT
_X_EXPORT Bool noXInputExtension = FALSE;
#endif
#ifdef XIDLE
_X_EXPORT Bool noXIdleExtension = FALSE;
#endif
#ifdef XV
_X_EXPORT Bool noXvExtension = FALSE;
#endif
#define X_INCLUDE_NETDB_H
#include <X11/Xos_r.h>
#include <errno.h>
Bool CoreDump;
#ifdef PANORAMIX
Bool PanoramiXExtensionDisabledHack = FALSE;
#endif
int auditTrailLevel = 1;
_X_EXPORT Bool Must_have_memory = FALSE;
#ifdef AIXV3
int SyncOn = 0;
extern int SelectWaitTime;
#endif
#if defined(SVR4) || defined(__linux__) || defined(CSRG_BASED)
#define HAS_SAVED_IDS_AND_SETEUID
#endif
#ifdef MEMBUG
#define MEM_FAIL_SCALE 100000
long Memory_fail = 0;
#include <stdlib.h> /* for random() */
#endif
static char *dev_tty_from_init = NULL; /* since we need to parse it anyway */
OsSigHandlerPtr
OsSignal(sig, handler)
int sig;
OsSigHandlerPtr handler;
{
#ifdef X_NOT_POSIX
return signal(sig, handler);
#else
struct sigaction act, oact;
sigemptyset(&act.sa_mask);
if (handler != SIG_IGN)
sigaddset(&act.sa_mask, sig);
act.sa_flags = 0;
act.sa_handler = handler;
sigaction(sig, &act, &oact);
return oact.sa_handler;
#endif
}
#ifdef SERVER_LOCK
/*
* Explicit support for a server lock file like the ones used for UUCP.
* For architectures with virtual terminals that can run more than one
* server at a time. This keeps the servers from stomping on each other
* if the user forgets to give them different display numbers.
*/
#define LOCK_DIR "/tmp"
#define LOCK_TMP_PREFIX "/.tX"
#define LOCK_PREFIX "/.X"
#define LOCK_SUFFIX "-lock"
#if defined(DGUX)
#include <limits.h>
#include <sys/param.h>
#endif
#ifndef PATH_MAX
#ifndef Lynx
#include <sys/param.h>
#else
#include <param.h>
#endif
#ifndef PATH_MAX
#ifdef MAXPATHLEN
#define PATH_MAX MAXPATHLEN
#else
#define PATH_MAX 1024
#endif
#endif
#endif
static Bool StillLocking = FALSE;
static char LockFile[PATH_MAX];
static Bool nolock = FALSE;
/*
* LockServer --
* Check if the server lock file exists. If so, check if the PID
* contained inside is valid. If so, then die. Otherwise, create
* the lock file containing the PID.
*/
void
LockServer(void)
{
char tmp[PATH_MAX], pid_str[12];
int lfd, i, haslock, l_pid, t;
char *tmppath = NULL;
int len;
char port[20];
if (nolock) return;
/*
* Path names
*/
tmppath = LOCK_DIR;
snprintf(port, sizeof(port), "%d", atoi(display));
len = strlen(LOCK_PREFIX) > strlen(LOCK_TMP_PREFIX) ? strlen(LOCK_PREFIX) :
strlen(LOCK_TMP_PREFIX);
len += strlen(tmppath) + strlen(port) + strlen(LOCK_SUFFIX) + 1;
if (len > sizeof(LockFile))
FatalError("Display name `%s' is too long\n", port);
(void)snprintf(tmp, sizeof(tmp),
"%s" LOCK_TMP_PREFIX "%s" LOCK_SUFFIX, tmppath, port);
(void)snprintf(LockFile, sizeof(LockFile),
"%s" LOCK_PREFIX "%s" LOCK_SUFFIX, tmppath, port);
/*
* Create a temporary file containing our PID. Attempt three times
* to create the file.
*/
StillLocking = TRUE;
i = 0;
do {
i++;
lfd = open(tmp, O_CREAT | O_EXCL | O_WRONLY, 0644);
if (lfd < 0)
sleep(2);
else
break;
} while (i < 3);
if (lfd < 0) {
unlink(tmp);
i = 0;
do {
i++;
lfd = open(tmp, O_CREAT | O_EXCL | O_WRONLY, 0644);
if (lfd < 0)
sleep(2);
else
break;
} while (i < 3);
}
if (lfd < 0)
FatalError("Could not create lock file in %s\n", tmp);
(void) snprintf(pid_str, sizeof(pid_str), "%10ld\n", (long)getpid());
(void) write(lfd, pid_str, 11);
#ifdef __OpenBSD__
/* if possible give away the lock file to the real uid/gid */
fchown(lfd, getuid(), getgid());
#endif
#ifndef USE_CHMOD
(void) fchmod(lfd, 0444);
#else
(void) chmod(tmp, 0444);
#endif
(void) close(lfd);
/*
* OK. Now the tmp file exists. Try three times to move it in place
* for the lock.
*/
i = 0;
haslock = 0;
while ((!haslock) && (i++ < 3)) {
haslock = (link(tmp,LockFile) == 0);
if (haslock) {
/*
* We're done.
*/
break;
}
else {
/*
* Read the pid from the existing file
*/
lfd = open(LockFile, O_RDONLY);
if (lfd < 0) {
unlink(tmp);
FatalError("Can't read lock file %s\n", LockFile);
}
pid_str[0] = '\0';
if (read(lfd, pid_str, 11) != 11) {
/*
* Bogus lock file.
*/
unlink(LockFile);
close(lfd);
continue;
}
pid_str[11] = '\0';
sscanf(pid_str, "%d", &l_pid);
close(lfd);
/*
* Now try to kill the PID to see if it exists.
*/
errno = 0;
t = kill(l_pid, 0);
if ((t< 0) && (errno == ESRCH)) {
/*
* Stale lock file.
*/
unlink(LockFile);
continue;
}
else if (((t < 0) && (errno == EPERM)) || (t == 0)) {
/*
* Process is still active.
*/
unlink(tmp);
FatalError("Server is already active for display %s\n%s %s\n%s\n",
port, "\tIf this server is no longer running, remove",
LockFile, "\tand start again.");
}
}
}
unlink(tmp);
if (!haslock)
FatalError("Could not create server lock file: %s\n", LockFile);
StillLocking = FALSE;
}
/*
* UnlockServer --
* Remove the server lock file.
*/
void
UnlockServer(void)
{
if (nolock) return;
if (!StillLocking){
(void) unlink(LockFile);
}
}
#ifdef X_PRIVSEP
int
ChownLock(uid_t uid, gid_t gid)
{
return chown(LockFile, uid, gid);
}
#endif
#endif /* SERVER_LOCK */
/* Force connections to close on SIGHUP from init */
/*ARGSUSED*/
SIGVAL
AutoResetServer (int sig)
{
int olderrno = errno;
dispatchException |= DE_RESET;
isItTimeToYield = TRUE;
#ifdef GPROF
chdir ("/tmp");
exit (0);
#endif
#if defined(SYSV) && defined(X_NOT_POSIX)
OsSignal (SIGHUP, AutoResetServer);
#endif
errno = olderrno;
}
/* Force connections to close and then exit on SIGTERM, SIGINT */
/*ARGSUSED*/
_X_EXPORT SIGVAL
GiveUp(int sig)
{
int olderrno = errno;
dispatchException |= DE_TERMINATE;
isItTimeToYield = TRUE;
#if defined(SYSV) && defined(X_NOT_POSIX)
if (sig)
OsSignal(sig, SIG_IGN);
#endif
errno = olderrno;
}
#if defined WIN32 && defined __MINGW32__
_X_EXPORT CARD32
GetTimeInMillis (void)
{
return GetTickCount ();
}
#else
_X_EXPORT CARD32
GetTimeInMillis(void)
{
struct timeval tv;
#ifdef MONOTONIC_CLOCK
struct timespec tp;
if (clock_gettime(CLOCK_MONOTONIC, &tp) == 0)
return (tp.tv_sec * 1000) + (tp.tv_nsec / 1000000L);
#endif
X_GETTIMEOFDAY(&tv);
return(tv.tv_sec * 1000) + (tv.tv_usec / 1000);
}
#endif
_X_EXPORT void
AdjustWaitForDelay (pointer waitTime, unsigned long newdelay)
{
static struct timeval delay_val;
struct timeval **wt = (struct timeval **) waitTime;
unsigned long olddelay;
if (*wt == NULL)
{
delay_val.tv_sec = newdelay / 1000;
delay_val.tv_usec = 1000 * (newdelay % 1000);
*wt = &delay_val;
}
else
{
olddelay = (*wt)->tv_sec * 1000 + (*wt)->tv_usec / 1000;
if (newdelay < olddelay)
{
(*wt)->tv_sec = newdelay / 1000;
(*wt)->tv_usec = 1000 * (newdelay % 1000);
}
}
}
void UseMsg(void)
{
#if !defined(AIXrt) && !defined(AIX386)
ErrorF("use: X [:<display>] [option]\n");
ErrorF("-a # mouse acceleration (pixels)\n");
ErrorF("-ac disable access control restrictions\n");
#ifdef MEMBUG
ErrorF("-alloc int chance alloc should fail\n");
#endif
ErrorF("-audit int set audit trail level\n");
ErrorF("-auth file select authorization file\n");
ErrorF("-br create root window with black background\n");
ErrorF("+bs enable any backing store support\n");
ErrorF("-bs disable any backing store support\n");
ErrorF("-c turns off key-click\n");
ErrorF("c # key-click volume (0-100)\n");
ErrorF("-cc int default color visual class\n");
ErrorF("-co file color database file\n");
#ifdef COMMANDLINE_CHALLENGED_OPERATING_SYSTEMS
ErrorF("-config file read options from file\n");
#endif
ErrorF("-core generate core dump on fatal error\n");
ErrorF("-dpi int screen resolution in dots per inch\n");
#ifdef DPMSExtension
ErrorF("dpms enables VESA DPMS monitor control\n");
ErrorF("-dpms disables VESA DPMS monitor control\n");
#endif
ErrorF("-deferglyphs [none|all|16] defer loading of [no|all|16-bit] glyphs\n");
ErrorF("-f # bell base (0-100)\n");
ErrorF("-fc string cursor font\n");
ErrorF("-fn string default font name\n");
ErrorF("-fp string default font path\n");
ErrorF("-help prints message with these options\n");
ErrorF("-I ignore all remaining arguments\n");
#ifdef RLIMIT_DATA
ErrorF("-ld int limit data space to N Kb\n");
#endif
#ifdef RLIMIT_NOFILE
ErrorF("-lf int limit number of open files to N\n");
#endif
#ifdef RLIMIT_STACK
ErrorF("-ls int limit stack space to N Kb\n");
#endif
#ifdef SERVER_LOCK
ErrorF("-nolock disable the locking mechanism\n");
#endif
#ifndef NOLOGOHACK
ErrorF("-logo enable logo in screen saver\n");
ErrorF("nologo disable logo in screen saver\n");
#endif
ErrorF("-nolisten string don't listen on protocol\n");
ErrorF("-noreset don't reset after last client exists\n");
ErrorF("-reset reset after last client exists\n");
ErrorF("-p # screen-saver pattern duration (minutes)\n");
ErrorF("-pn accept failure to listen on all ports\n");
ErrorF("-nopn reject failure to listen on all ports\n");
ErrorF("-r turns off auto-repeat\n");
ErrorF("r turns on auto-repeat \n");
#ifdef RENDER
ErrorF("-render [default|mono|gray|color] set render color alloc policy\n");
#endif
ErrorF("-s # screen-saver timeout (minutes)\n");
#ifdef XCSECURITY
ErrorF("-sp file security policy file\n");
#endif
#ifdef XPRINT
PrinterUseMsg();
#endif
ErrorF("-su disable any save under support\n");
ErrorF("-t # mouse threshold (pixels)\n");
ErrorF("-terminate terminate at server reset\n");
ErrorF("-to # connection time out\n");
ErrorF("-tst disable testing extensions\n");
ErrorF("ttyxx server started from init on /dev/ttyxx\n");
ErrorF("v video blanking for screen-saver\n");
ErrorF("-v screen-saver without video blanking\n");
ErrorF("-wm WhenMapped default backing-store\n");
ErrorF("-wr create root window with white background\n");
ErrorF("-x string loads named extension at init time \n");
ErrorF("-maxbigreqsize set maximal bigrequest size \n");
#ifdef PANORAMIX
ErrorF("+xinerama Enable XINERAMA extension\n");
ErrorF("-xinerama Disable XINERAMA extension\n");
#endif
#ifdef SMART_SCHEDULE
ErrorF("-dumbSched Disable smart scheduling, enable old behavior\n");
ErrorF("-schedInterval int Set scheduler interval in msec\n");
#endif
ErrorF("+extension name Enable extension\n");
ErrorF("-extension name Disable extension\n");
#ifdef XDMCP
XdmcpUseMsg();
#endif
#endif /* !AIXrt && ! AIX386 */
#ifdef XKB
XkbUseMsg();
#endif
ddxUseMsg();
}
/* This function performs a rudimentary sanity check
* on the display name passed in on the command-line,
* since this string is used to generate filenames.
* It is especially important that the display name
* not contain a "/" and not start with a "-".
* --kvajk
*/
static int
VerifyDisplayName(const char *d)
{
if ( d == (char *)0 ) return( 0 ); /* null */
if ( *d == '\0' ) return( 0 ); /* empty */
if ( *d == '-' ) return( 0 ); /* could be confused for an option */
if ( *d == '.' ) return( 0 ); /* must not equal "." or ".." */
if ( strchr(d, '/') != (char *)0 ) return( 0 ); /* very important!!! */
return( 1 );
}
/*
* This function is responsible for doing initalisation of any global
* variables at an very early point of server startup (even before
* |ProcessCommandLine()|.
*/
void InitGlobals(void)
{
ddxInitGlobals();
}
/*
* This function parses the command line. Handles device-independent fields
* and allows ddx to handle additional fields. It is not allowed to modify
* argc or any of the strings pointed to by argv.
*/
void
ProcessCommandLine(int argc, char *argv[])
{
int i, skip;
defaultKeyboardControl.autoRepeat = TRUE;
#ifdef NO_PART_NET
PartialNetwork = FALSE;
#else
PartialNetwork = TRUE;
#endif
for ( i = 1; i < argc; i++ )
{
/* call ddx first, so it can peek/override if it wants */
if((skip = ddxProcessArgument(argc, argv, i)))
{
i += (skip - 1);
}
else if(argv[i][0] == ':')
{
/* initialize display */
display = argv[i];
display++;
if( ! VerifyDisplayName( display ) ) {
ErrorF("Bad display name: %s\n", display);
UseMsg();
FatalError("Bad display name, exiting: %s\n", display);
}
}
else if ( strcmp( argv[i], "-a") == 0)
{
if(++i < argc)
defaultPointerControl.num = atoi(argv[i]);
else
UseMsg();
}
else if ( strcmp( argv[i], "-ac") == 0)
{
defeatAccessControl = TRUE;
}
#ifdef MEMBUG
else if ( strcmp( argv[i], "-alloc") == 0)
{
if(++i < argc)
Memory_fail = atoi(argv[i]);
else
UseMsg();
}
#endif
else if ( strcmp( argv[i], "-audit") == 0)
{
if(++i < argc)
auditTrailLevel = atoi(argv[i]);
else
UseMsg();
}
else if ( strcmp( argv[i], "-auth") == 0)
{
if(++i < argc)
InitAuthorization (argv[i]);
else
UseMsg();
}
else if ( strcmp( argv[i], "-br") == 0)
blackRoot = TRUE;
else if ( strcmp( argv[i], "+bs") == 0)
enableBackingStore = TRUE;
else if ( strcmp( argv[i], "-bs") == 0)
disableBackingStore = TRUE;
else if ( strcmp( argv[i], "c") == 0)
{
if(++i < argc)
defaultKeyboardControl.click = atoi(argv[i]);
else
UseMsg();
}
else if ( strcmp( argv[i], "-c") == 0)
{
defaultKeyboardControl.click = 0;
}
else if ( strcmp( argv[i], "-cc") == 0)
{
if(++i < argc)
defaultColorVisualClass = atoi(argv[i]);
else
UseMsg();
}
else if ( strcmp( argv[i], "-co") == 0)
{
if(++i < argc) {
if (strlen(argv[i]) < MAXPATHLEN)
rgbPath = argv[i];
} else
UseMsg();
}
else if ( strcmp( argv[i], "-core") == 0)
{
CoreDump = TRUE;
#if !defined(WIN32) || !defined(__MINGW32__)
struct rlimit core_limit;
getrlimit (RLIMIT_CORE, &core_limit);
core_limit.rlim_cur = core_limit.rlim_max;
setrlimit (RLIMIT_CORE, &core_limit);
#endif
}
else if ( strcmp( argv[i], "-dpi") == 0)
{
if(++i < argc)
monitorResolution = atoi(argv[i]);
else
UseMsg();
}
#ifdef DPMSExtension
else if ( strcmp( argv[i], "dpms") == 0)
DPMSEnabledSwitch = TRUE;
else if ( strcmp( argv[i], "-dpms") == 0)
DPMSDisabledSwitch = TRUE;
#endif
else if ( strcmp( argv[i], "-deferglyphs") == 0)
{
if(++i >= argc || !ParseGlyphCachingMode(argv[i]))
UseMsg();
}
else if ( strcmp( argv[i], "-f") == 0)
{
if(++i < argc)
defaultKeyboardControl.bell = atoi(argv[i]);
else
UseMsg();
}
else if ( strcmp( argv[i], "-fc") == 0)
{
if(++i < argc)
defaultCursorFont = argv[i];
else
UseMsg();
}
else if ( strcmp( argv[i], "-fn") == 0)
{
if(++i < argc)
defaultTextFont = argv[i];
else
UseMsg();
}
else if ( strcmp( argv[i], "-fp") == 0)
{
if(++i < argc)
{
defaultFontPath = argv[i];
}
else
UseMsg();
}
else if ( strcmp( argv[i], "-help") == 0)
{
UseMsg();
exit(0);
}
#ifdef XKB
else if ( (skip=XkbProcessArguments(argc,argv,i))!=0 ) {
if (skip>0)
i+= skip-1;
else UseMsg();
}
#endif
#ifdef RLIMIT_DATA
else if ( strcmp( argv[i], "-ld") == 0)
{
if(++i < argc)
{
limitDataSpace = atoi(argv[i]);
if (limitDataSpace > 0)
limitDataSpace *= 1024;
}
else
UseMsg();
}
#endif
#ifdef RLIMIT_NOFILE
else if ( strcmp( argv[i], "-lf") == 0)
{
if(++i < argc)
limitNoFile = atoi(argv[i]);
else
UseMsg();
}
#endif
#ifdef RLIMIT_STACK
else if ( strcmp( argv[i], "-ls") == 0)
{
if(++i < argc)
{
limitStackSpace = atoi(argv[i]);
if (limitStackSpace > 0)
limitStackSpace *= 1024;
}
else
UseMsg();
}
#endif
#ifdef SERVER_LOCK
else if ( strcmp ( argv[i], "-nolock") == 0)
{
#if !defined(WIN32) && !defined(__CYGWIN__)
if (getuid() != 0)
ErrorF("Warning: the -nolock option can only be used by root\n");
else
#endif
nolock = TRUE;
}
#endif
#ifndef NOLOGOHACK
else if ( strcmp( argv[i], "-logo") == 0)
{
logoScreenSaver = 1;
}
else if ( strcmp( argv[i], "nologo") == 0)
{
logoScreenSaver = 0;
}
#endif
else if ( strcmp( argv[i], "-nolisten") == 0)
{
if(++i < argc) {
if (_XSERVTransNoListen(argv[i]))
FatalError ("Failed to disable listen for %s transport",
argv[i]);
} else
UseMsg();
}
else if ( strcmp( argv[i], "-noreset") == 0)
{
dispatchExceptionAtReset = 0;
}
else if ( strcmp( argv[i], "-reset") == 0)
{
dispatchExceptionAtReset = DE_RESET;
}
else if ( strcmp( argv[i], "-p") == 0)
{
if(++i < argc)
defaultScreenSaverInterval = ((CARD32)atoi(argv[i])) *
MILLI_PER_MIN;
else
UseMsg();
}
else if ( strcmp( argv[i], "-pn") == 0)
PartialNetwork = TRUE;
else if ( strcmp( argv[i], "-nopn") == 0)
PartialNetwork = FALSE;
else if ( strcmp( argv[i], "r") == 0)
defaultKeyboardControl.autoRepeat = TRUE;
else if ( strcmp( argv[i], "-r") == 0)
defaultKeyboardControl.autoRepeat = FALSE;
else if ( strcmp( argv[i], "-s") == 0)
{
if(++i < argc)
defaultScreenSaverTime = ((CARD32)atoi(argv[i])) *
MILLI_PER_MIN;
else
UseMsg();
}
else if ( strcmp( argv[i], "-su") == 0)
disableSaveUnders = TRUE;
else if ( strcmp( argv[i], "-t") == 0)
{
if(++i < argc)
defaultPointerControl.threshold = atoi(argv[i]);
else
UseMsg();
}
else if ( strcmp( argv[i], "-terminate") == 0)
{
dispatchExceptionAtReset = DE_TERMINATE;
}
else if ( strcmp( argv[i], "-to") == 0)
{
if(++i < argc)
TimeOutValue = ((CARD32)atoi(argv[i])) * MILLI_PER_SECOND;
else
UseMsg();
}
else if ( strcmp( argv[i], "-tst") == 0)
{
noTestExtensions = TRUE;
}
else if ( strcmp( argv[i], "v") == 0)
defaultScreenSaverBlanking = PreferBlanking;
else if ( strcmp( argv[i], "-v") == 0)
defaultScreenSaverBlanking = DontPreferBlanking;
else if ( strcmp( argv[i], "-wm") == 0)
defaultBackingStore = WhenMapped;
else if ( strcmp( argv[i], "-wr") == 0)
whiteRoot = TRUE;
else if ( strcmp( argv[i], "-maxbigreqsize") == 0) {
if(++i < argc) {
long reqSizeArg = atol(argv[i]);
/* Request size > 128MB does not make much sense... */
if( reqSizeArg > 0L && reqSizeArg < 128L ) {
maxBigRequestSize = (reqSizeArg * 1048576L) - 1L;
}
else
{
UseMsg();
}
}
else
{
UseMsg();
}
}
#ifdef PANORAMIX
else if ( strcmp( argv[i], "+xinerama") == 0){
noPanoramiXExtension = FALSE;
}
else if ( strcmp( argv[i], "-xinerama") == 0){
noPanoramiXExtension = TRUE;
}
else if ( strcmp( argv[i], "-disablexineramaextension") == 0){
PanoramiXExtensionDisabledHack = TRUE;
}
#endif
else if ( strcmp( argv[i], "-x") == 0)
{
if(++i >= argc)
UseMsg();
/* For U**x, which doesn't support dynamic loading, there's nothing
* to do when we see a -x. Either the extension is linked in or
* it isn't */
}
else if ( strcmp( argv[i], "-I") == 0)
{
/* ignore all remaining arguments */
break;
}
else if (strncmp (argv[i], "tty", 3) == 0)
{
/* just in case any body is interested */
dev_tty_from_init = argv[i];
}
#ifdef XDMCP
else if ((skip = XdmcpOptions(argc, argv, i)) != i)
{
i = skip - 1;
}
#endif
#ifdef XPRINT
else if ((skip = PrinterOptions(argc, argv, i)) != i)
{
i = skip - 1;
}
#endif
#ifdef XCSECURITY
else if ((skip = XSecurityOptions(argc, argv, i)) != i)
{
i = skip - 1;
}
#endif
#ifdef AIXV3
else if ( strcmp( argv[i], "-timeout") == 0)
{
if(++i < argc)
SelectWaitTime = atoi(argv[i]);
else
UseMsg();
}
else if ( strcmp( argv[i], "-sync") == 0)
{
SyncOn++;
}
#endif
#ifdef SMART_SCHEDULE
else if ( strcmp( argv[i], "-dumbSched") == 0)
{
SmartScheduleDisable = TRUE;
}
else if ( strcmp( argv[i], "-schedInterval") == 0)
{
if (++i < argc)
{
SmartScheduleInterval = atoi(argv[i]);
SmartScheduleSlice = SmartScheduleInterval;
}
else
UseMsg();
}
else if ( strcmp( argv[i], "-schedMax") == 0)
{
if (++i < argc)
{
SmartScheduleMaxSlice = atoi(argv[i]);
}
else
UseMsg();
}
#endif
#ifdef RENDER
else if ( strcmp( argv[i], "-render" ) == 0)
{
if (++i < argc)
{
int policy = PictureParseCmapPolicy (argv[i]);
if (policy != PictureCmapPolicyInvalid)
PictureCmapPolicy = policy;
else
UseMsg ();
}
else
UseMsg ();
}
#endif
else if ( strcmp( argv[i], "+extension") == 0)
{
if (++i < argc)
{
if (!EnableDisableExtension(argv[i], TRUE))
EnableDisableExtensionError(argv[i], TRUE);
}
else
UseMsg();
}
else if ( strcmp( argv[i], "-extension") == 0)
{
if (++i < argc)
{
if (!EnableDisableExtension(argv[i], FALSE))
EnableDisableExtensionError(argv[i], FALSE);
}
else
UseMsg();
}
else
{
ErrorF("Unrecognized option: %s\n", argv[i]);
UseMsg();
FatalError("Unrecognized option: %s\n", argv[i]);
}
}
}
#ifdef COMMANDLINE_CHALLENGED_OPERATING_SYSTEMS
static void
InsertFileIntoCommandLine(
int *resargc, char ***resargv,
int prefix_argc, char **prefix_argv,
char *filename,
int suffix_argc, char **suffix_argv)
{
struct stat st;
FILE *f;
char *p;
char *q;
int insert_argc;
char *buf;
int len;
int i;
f = fopen(filename, "r");
if (!f)
FatalError("Can't open option file %s\n", filename);
fstat(fileno(f), &st);
buf = (char *) xalloc((unsigned) st.st_size + 1);
if (!buf)
FatalError("Out of Memory\n");
len = fread(buf, 1, (unsigned) st.st_size, f);
fclose(f);
if (len < 0)
FatalError("Error reading option file %s\n", filename);
buf[len] = '\0';
p = buf;
q = buf;
insert_argc = 0;
while (*p)
{
while (isspace(*p))
p++;
if (!*p)
break;
if (*p == '#')
{
while (*p && *p != '\n')
p++;
} else
{
while (*p && !isspace(*p))
*q++ = *p++;
/* Since p and q might still be pointing at the same place, we */
/* need to step p over the whitespace now before we add the null. */
if (*p)
p++;
*q++ = '\0';
insert_argc++;
}
}
buf = (char *) xrealloc(buf, q - buf);
if (!buf)
FatalError("Out of memory reallocing option buf\n");
*resargc = prefix_argc + insert_argc + suffix_argc;
*resargv = (char **) xalloc((*resargc + 1) * sizeof(char *));
if (!*resargv)
FatalError("Out of Memory\n");
memcpy(*resargv, prefix_argv, prefix_argc * sizeof(char *));
p = buf;
for (i = 0; i < insert_argc; i++)
{
(*resargv)[prefix_argc + i] = p;
p += strlen(p) + 1;
}
memcpy(*resargv + prefix_argc + insert_argc,
suffix_argv, suffix_argc * sizeof(char *));
(*resargv)[*resargc] = NULL;
} /* end InsertFileIntoCommandLine */
void
ExpandCommandLine(int *pargc, char ***pargv)
{
int i;
#if !defined(WIN32) && !defined(__CYGWIN__)
if (getuid() != geteuid())
return;
#endif
for (i = 1; i < *pargc; i++)
{
if ( (0 == strcmp((*pargv)[i], "-config")) && (i < (*pargc - 1)) )
{
InsertFileIntoCommandLine(pargc, pargv,
i, *pargv,
(*pargv)[i+1], /* filename */
*pargc - i - 2, *pargv + i + 2);
i--;
}
}
} /* end ExpandCommandLine */
#endif
/* Implement a simple-minded font authorization scheme. The authorization
name is "hp-hostname-1", the contents are simply the host name. */
int
set_font_authorizations(char **authorizations, int *authlen, pointer client)
{
#define AUTHORIZATION_NAME "hp-hostname-1"
#if defined(TCPCONN) || defined(STREAMSCONN)
static char *result = NULL;
static char *p = NULL;
if (p == NULL)
{
char hname[1024], *hnameptr;
unsigned int len;
#if defined(IPv6) && defined(AF_INET6)
struct addrinfo hints, *ai = NULL;
#else
struct hostent *host;
#ifdef XTHREADS_NEEDS_BYNAMEPARAMS
_Xgethostbynameparams hparams;
#endif
#endif
gethostname(hname, 1024);
#if defined(IPv6) && defined(AF_INET6)
bzero(&hints, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
if (getaddrinfo(hname, NULL, &hints, &ai) == 0) {
hnameptr = ai->ai_canonname;
} else {
hnameptr = hname;
}
#else
host = _XGethostbyname(hname, hparams);
if (host == NULL)
hnameptr = hname;
else
hnameptr = host->h_name;
#endif
len = strlen(hnameptr) + 1;
result = xalloc(len + sizeof(AUTHORIZATION_NAME) + 4);
p = result;
*p++ = sizeof(AUTHORIZATION_NAME) >> 8;
*p++ = sizeof(AUTHORIZATION_NAME) & 0xff;
*p++ = (len) >> 8;
*p++ = (len & 0xff);
memmove(p, AUTHORIZATION_NAME, sizeof(AUTHORIZATION_NAME));
p += sizeof(AUTHORIZATION_NAME);
memmove(p, hnameptr, len);
p += len;
#if defined(IPv6) && defined(AF_INET6)
if (ai) {
freeaddrinfo(ai);
}
#endif
}
*authlen = p - result;
*authorizations = result;
return 1;
#else /* TCPCONN */
return 0;
#endif /* TCPCONN */
}
/* XALLOC -- X's internal memory allocator. Why does it return unsigned
* long * instead of the more common char *? Well, if you read K&R you'll
* see they say that alloc must return a pointer "suitable for conversion"
* to whatever type you really want. In a full-blown generic allocator
* there's no way to solve the alignment problems without potentially
* wasting lots of space. But we have a more limited problem. We know
* we're only ever returning pointers to structures which will have to
* be long word aligned. So we are making a stronger guarantee. It might
* have made sense to make Xalloc return char * to conform with people's
* expectations of malloc, but this makes lint happier.
*/
#ifndef INTERNAL_MALLOC
_X_EXPORT void *
Xalloc(unsigned long amount)
{
register pointer ptr;
if ((long)amount <= 0) {
return (unsigned long *)NULL;
}
/* aligned extra on long word boundary */
amount = (amount + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
#ifdef MEMBUG
if (!Must_have_memory && Memory_fail &&
((random() % MEM_FAIL_SCALE) < Memory_fail))
return (unsigned long *)NULL;
#endif
if ((ptr = (pointer)malloc(amount))) {
return (unsigned long *)ptr;
}
if (Must_have_memory)
FatalError("Out of memory");
return (unsigned long *)NULL;
}
/*****************
* XNFalloc
* "no failure" realloc, alternate interface to Xalloc w/o Must_have_memory
*****************/
_X_EXPORT void *
XNFalloc(unsigned long amount)
{
register pointer ptr;
if ((long)amount <= 0)
{
return (unsigned long *)NULL;
}
/* aligned extra on long word boundary */
amount = (amount + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
ptr = (pointer)malloc(amount);
if (!ptr)
{
FatalError("Out of memory");
}
return ((unsigned long *)ptr);
}
/*****************
* Xcalloc
*****************/
_X_EXPORT void *
Xcalloc(unsigned long amount)
{
unsigned long *ret;
ret = Xalloc (amount);
if (ret)
bzero ((char *) ret, (int) amount);
return ret;
}
/*****************
* XNFcalloc
*****************/
_X_EXPORT void *
XNFcalloc(unsigned long amount)
{
unsigned long *ret;
ret = Xalloc (amount);
if (ret)
bzero ((char *) ret, (int) amount);
else if ((long)amount > 0)
FatalError("Out of memory");
return ret;
}
/*****************
* Xrealloc
*****************/
_X_EXPORT void *
Xrealloc(pointer ptr, unsigned long amount)
{
#ifdef MEMBUG
if (!Must_have_memory && Memory_fail &&
((random() % MEM_FAIL_SCALE) < Memory_fail))
return (unsigned long *)NULL;
#endif
if ((long)amount <= 0)
{
if (ptr && !amount)
free(ptr);
return (unsigned long *)NULL;
}
amount = (amount + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
if (ptr)
ptr = (pointer)realloc((char *)ptr, amount);
else
ptr = (pointer)malloc(amount);
if (ptr)
return (unsigned long *)ptr;
if (Must_have_memory)
FatalError("Out of memory");
return (unsigned long *)NULL;
}
/*****************
* XNFrealloc
* "no failure" realloc, alternate interface to Xrealloc w/o Must_have_memory
*****************/
_X_EXPORT void *
XNFrealloc(pointer ptr, unsigned long amount)
{
if (( ptr = (pointer)Xrealloc( ptr, amount ) ) == NULL)
{
if ((long)amount > 0)
FatalError( "Out of memory" );
}
return ((unsigned long *)ptr);
}
/*****************
* Xfree
* calls free
*****************/
_X_EXPORT void
Xfree(pointer ptr)
{
if (ptr)
free((char *)ptr);
}
void
OsInitAllocator (void)
{
#ifdef MEMBUG
static int been_here;
/* Check the memory system after each generation */
if (been_here)
CheckMemory ();
else
been_here = 1;
#endif
}
#endif /* !INTERNAL_MALLOC */
char *
Xstrdup(const char *s)
{
char *sd;
size_t len;
if (s == NULL)
return NULL;
len = strlen(s) + 1;
sd = (char *)Xalloc(len);
if (sd != NULL)
strlcpy(sd, s, len);
return sd;
}
_X_EXPORT char *
XNFstrdup(const char *s)
{
char *sd;
size_t len;
if (s == NULL)
return NULL;
len = strlen(s) + 1;
sd = (char *)XNFalloc(len);
strlcpy(sd, s, len);
return sd;
}
#ifdef SMART_SCHEDULE
unsigned long SmartScheduleIdleCount;
Bool SmartScheduleIdle;
Bool SmartScheduleTimerStopped;
#ifdef SIGVTALRM
#define SMART_SCHEDULE_POSSIBLE
#endif
#ifdef SMART_SCHEDULE_POSSIBLE
#define SMART_SCHEDULE_SIGNAL SIGALRM
#define SMART_SCHEDULE_TIMER ITIMER_REAL
#endif
static void
SmartScheduleStopTimer (void)
{
#ifdef SMART_SCHEDULE_POSSIBLE
struct itimerval timer;
timer.it_interval.tv_sec = 0;
timer.it_interval.tv_usec = 0;
timer.it_value.tv_sec = 0;
timer.it_value.tv_usec = 0;
(void) setitimer (ITIMER_REAL, &timer, 0);
SmartScheduleTimerStopped = TRUE;
#endif
}
Bool
SmartScheduleStartTimer (void)
{
#ifdef SMART_SCHEDULE_POSSIBLE
struct itimerval timer;
SmartScheduleTimerStopped = FALSE;
timer.it_interval.tv_sec = 0;
timer.it_interval.tv_usec = SmartScheduleInterval * 1000;
timer.it_value.tv_sec = 0;
timer.it_value.tv_usec = SmartScheduleInterval * 1000;
return setitimer (ITIMER_REAL, &timer, 0) >= 0;
#endif
return FALSE;
}
#ifdef SMART_SCHEDULE_POSSIBLE
static void
SmartScheduleTimer (int sig)
{
int olderrno = errno;
SmartScheduleTime += SmartScheduleInterval;
if (SmartScheduleIdle)
{
SmartScheduleStopTimer ();
}
errno = olderrno;
}
#endif
Bool
SmartScheduleInit (void)
{
#ifdef SMART_SCHEDULE_POSSIBLE
struct sigaction act;
if (SmartScheduleDisable)
return TRUE;
bzero ((char *) &act, sizeof(struct sigaction));
/* Set up the timer signal function */
act.sa_handler = SmartScheduleTimer;
sigemptyset (&act.sa_mask);
sigaddset (&act.sa_mask, SMART_SCHEDULE_SIGNAL);
if (sigaction (SMART_SCHEDULE_SIGNAL, &act, 0) < 0)
{
perror ("sigaction for smart scheduler");
return FALSE;
}
/* Set up the virtual timer */
if (!SmartScheduleStartTimer ())
{
perror ("scheduling timer");
return FALSE;
}
/* stop the timer and wait for WaitForSomething to start it */
SmartScheduleStopTimer ();
return TRUE;
#else
return FALSE;
#endif
}
#endif
#ifdef SIG_BLOCK
static sigset_t PreviousSignalMask;
static int BlockedSignalCount;
#endif
void
OsBlockSignals (void)
{
#ifdef SIG_BLOCK
if (BlockedSignalCount++ == 0)
{
sigset_t set;
sigemptyset (&set);
#ifdef SIGALRM
sigaddset (&set, SIGALRM);
#endif
#ifdef SIGVTALRM
sigaddset (&set, SIGVTALRM);
#endif
#ifdef SIGWINCH
sigaddset (&set, SIGWINCH);
#endif
#ifdef SIGIO
sigaddset (&set, SIGIO);
#endif
#ifdef SIGTSTP
sigaddset (&set, SIGTSTP);
#endif
#ifdef SIGTTIN
sigaddset (&set, SIGTTIN);
#endif
#ifdef SIGTTOU
sigaddset (&set, SIGTTOU);
#endif
#ifdef SIGCHLD
sigaddset (&set, SIGCHLD);
#endif
sigprocmask (SIG_BLOCK, &set, &PreviousSignalMask);
}
#endif
}
void
OsReleaseSignals (void)
{
#ifdef SIG_BLOCK
if (--BlockedSignalCount == 0)
{
sigprocmask (SIG_SETMASK, &PreviousSignalMask, 0);
}
#endif
}
#if !defined(WIN32)
/*
* "safer" versions of system(3), popen(3) and pclose(3) which give up
* all privs before running a command.
*
* This is based on the code in FreeBSD 2.2 libc.
*
* XXX It'd be good to redirect stderr so that it ends up in the log file
* as well. As it is now, xkbcomp messages don't end up in the log file.
*/
int
System(char *command)
{
int pid, p;
#ifdef SIGCHLD
void (*csig)(int);
#endif
int status;
if (!command)
return(1);
#ifdef SIGCHLD
csig = signal(SIGCHLD, SIG_DFL);
#endif
#ifdef DEBUG
ErrorF("System: `%s'\n", command);
#endif
switch (pid = fork()) {
case -1: /* error */
p = -1;
case 0: /* child */
if (setgid(getgid()) == -1)
_exit(127);
if (setuid(getuid()) == -1)
_exit(127);
execl("/bin/sh", "sh", "-c", command, (char *)NULL);
_exit(127);
default: /* parent */
do {
p = waitpid(pid, &status, 0);
} while (p == -1 && errno == EINTR);
}
#ifdef SIGCHLD
signal(SIGCHLD, csig);
#endif
return p == -1 ? -1 : status;
}
static struct pid {
struct pid *next;
FILE *fp;
int pid;
} *pidlist;
pointer
Popen(char *command, char *type)
{
struct pid *cur;
FILE *iop;
int pdes[2], pid;
if (command == NULL || type == NULL)
return NULL;
if ((*type != 'r' && *type != 'w') || type[1])
return NULL;
if ((cur = (struct pid *)xalloc(sizeof(struct pid))) == NULL)
return NULL;
if (pipe(pdes) < 0) {
xfree(cur);
return NULL;
}
switch (pid = fork()) {
case -1: /* error */
close(pdes[0]);
close(pdes[1]);
xfree(cur);
return NULL;
case 0: /* child */
if (setgid(getgid()) == -1)
_exit(127);
if (setuid(getuid()) == -1)
_exit(127);
if (*type == 'r') {
if (pdes[1] != 1) {
/* stdout */
dup2(pdes[1], 1);
close(pdes[1]);
}
close(pdes[0]);
} else {
if (pdes[0] != 0) {
/* stdin */
dup2(pdes[0], 0);
close(pdes[0]);
}
close(pdes[1]);
}
execl("/bin/sh", "sh", "-c", command, (char *)NULL);
_exit(127);
}
/* Avoid EINTR during stdio calls */
OsBlockSignals ();
/* parent */
if (*type == 'r') {
iop = fdopen(pdes[0], type);
close(pdes[1]);
} else {
iop = fdopen(pdes[1], type);
close(pdes[0]);
}
cur->fp = iop;
cur->pid = pid;
cur->next = pidlist;
pidlist = cur;
#ifdef DEBUG
ErrorF("Popen: `%s', fp = %p\n", command, iop);
#endif
return iop;
}
/* fopen that drops privileges */
pointer
Fopen(char *file, char *type)
{
FILE *iop;
#ifndef HAS_SAVED_IDS_AND_SETEUID
struct pid *cur;
int pdes[2], pid;
if (file == NULL || type == NULL)
return NULL;
if ((*type != 'r' && *type != 'w') || type[1])
return NULL;
if ((cur = (struct pid *)xalloc(sizeof(struct pid))) == NULL)
return NULL;
if (pipe(pdes) < 0) {
xfree(cur);
return NULL;
}
switch (pid = fork()) {
case -1: /* error */
close(pdes[0]);
close(pdes[1]);
xfree(cur);
return NULL;
case 0: /* child */
if (setgid(getgid()) == -1)
_exit(127);
if (setuid(getuid()) == -1)
_exit(127);
if (*type == 'r') {
if (pdes[1] != 1) {
/* stdout */
dup2(pdes[1], 1);
close(pdes[1]);
}
close(pdes[0]);
} else {
if (pdes[0] != 0) {
/* stdin */
dup2(pdes[0], 0);
close(pdes[0]);
}
close(pdes[1]);
}
execl("/bin/cat", "cat", file, (char *)NULL);
_exit(127);
}
/* Avoid EINTR during stdio calls */
OsBlockSignals ();
/* parent */
if (*type == 'r') {
iop = fdopen(pdes[0], type);
close(pdes[1]);
} else {
iop = fdopen(pdes[1], type);
close(pdes[0]);
}
cur->fp = iop;
cur->pid = pid;
cur->next = pidlist;
pidlist = cur;
#ifdef DEBUG
ErrorF("Fopen(%s), fp = %p\n", file, iop);
#endif
return iop;
#else
int ruid, euid;
ruid = getuid();
euid = geteuid();
if (seteuid(ruid) == -1) {
return NULL;
}
iop = fopen(file, type);
if (seteuid(euid) == -1) {
fclose(iop);
return NULL;
}
return iop;
#endif /* HAS_SAVED_IDS_AND_SETEUID */
}
int
Pclose(pointer iop)
{
struct pid *cur, *last;
int pstat;
int pid;
#ifdef DEBUG
ErrorF("Pclose: fp = %p\n", iop);
#endif
fclose(iop);
for (last = NULL, cur = pidlist; cur; last = cur, cur = cur->next)
if (cur->fp == iop)
break;
if (cur == NULL)
return -1;
do {
pid = waitpid(cur->pid, &pstat, 0);
} while (pid == -1 && errno == EINTR);
if (last == NULL)
pidlist = cur->next;
else
last->next = cur->next;
xfree(cur);
/* allow EINTR again */
OsReleaseSignals ();
return pid == -1 ? -1 : pstat;
}
int
Fclose(pointer iop)
{
#ifdef HAS_SAVED_IDS_AND_SETEUID
return fclose(iop);
#else
return Pclose(iop);
#endif
}
#endif /* !WIN32 */
/*
* CheckUserParameters: check for long command line arguments and long
* environment variables. By default, these checks are only done when
* the server's euid != ruid. In 3.3.x, these checks were done in an
* external wrapper utility.
*/
/* Consider LD* variables insecure? */
#ifndef REMOVE_ENV_LD
#define REMOVE_ENV_LD 1
#endif
/* Remove long environment variables? */
#ifndef REMOVE_LONG_ENV
#define REMOVE_LONG_ENV 1
#endif
/*
* Disallow stdout or stderr as pipes? It's possible to block the X server
* when piping stdout+stderr to a pipe.
*
* Don't enable this because it looks like it's going to cause problems.
*/
#ifndef NO_OUTPUT_PIPES
#define NO_OUTPUT_PIPES 0
#endif
/* Check args and env only if running setuid (euid == 0 && euid != uid) ? */
#ifndef CHECK_EUID
#ifndef WIN32
#define CHECK_EUID 1
#else
#define CHECK_EUID 0
#endif
#endif
/*
* Maybe the locale can be faked to make isprint(3) report that everything
* is printable? Avoid it by default.
*/
#ifndef USE_ISPRINT
#define USE_ISPRINT 0
#endif
#define MAX_ARG_LENGTH 128
#define MAX_ENV_LENGTH 256
#define MAX_ENV_PATH_LENGTH 2048 /* Limit for *PATH and TERMCAP */
#if USE_ISPRINT
#include <ctype.h>
#define checkPrintable(c) isprint(c)
#else
#define checkPrintable(c) (((c) & 0x7f) >= 0x20 && ((c) & 0x7f) != 0x7f)
#endif
enum BadCode {
NotBad = 0,
UnsafeArg,
ArgTooLong,
UnprintableArg,
EnvTooLong,
OutputIsPipe,
InternalError
};
#if defined(VENDORSUPPORT)
#define BUGADDRESS VENDORSUPPORT
#elif defined(BUILDERADDR)
#define BUGADDRESS BUILDERADDR
#else
#define BUGADDRESS "xorg@freedesktop.org"
#endif
#define ARGMSG \
"\nIf the arguments used are valid, and have been rejected incorrectly\n" \
"please send details of the arguments and why they are valid to\n" \
"%s. In the meantime, you can start the Xserver as\n" \
"the \"super user\" (root).\n"
#define ENVMSG \
"\nIf the environment is valid, and have been rejected incorrectly\n" \
"please send details of the environment and why it is valid to\n" \
"%s. In the meantime, you can start the Xserver as\n" \
"the \"super user\" (root).\n"
void
CheckUserParameters(int argc, char **argv, char **envp)
{
enum BadCode bad = NotBad;
int i = 0, j;
char *a, *e = NULL;
#if defined(__QNX__) && !defined(__QNXNTO__)
char cmd_name[64];
#endif
#if CHECK_EUID
if (geteuid() == 0 && getuid() != geteuid())
#endif
{
/* Check each argv[] */
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-fp") == 0)
{
i++; /* continue with next argument. skip the length check */
if (i >= argc)
break;
} else
{
if (strlen(argv[i]) > MAX_ARG_LENGTH) {
bad = ArgTooLong;
break;
}
}
a = argv[i];
while (*a) {
if (checkPrintable(*a) == 0) {
bad = UnprintableArg;
break;
}
a++;
}
if (bad)
break;
}
if (!bad) {
/* Check each envp[] */
for (i = 0; envp[i]; i++) {
/* Check for bad environment variables and values */
#if REMOVE_ENV_LD
while (envp[i] && (strncmp(envp[i], "LD", 2) == 0)) {
#ifdef ENVDEBUG
ErrorF("CheckUserParameters: removing %s from the "
"environment\n", strtok(envp[i], "="));
#endif
for (j = i; envp[j]; j++) {
envp[j] = envp[j+1];
}
}
#endif
if (envp[i] && (strlen(envp[i]) > MAX_ENV_LENGTH)) {
#if REMOVE_LONG_ENV
#ifdef ENVDEBUG
ErrorF("CheckUserParameters: removing %s from the "
"environment\n", strtok(envp[i], "="));
#endif
for (j = i; envp[j]; j++) {
envp[j] = envp[j+1];
}
i--;
#else
char *eq;
int len;
eq = strchr(envp[i], '=');
if (!eq)
continue;
len = eq - envp[i];
e = malloc(len + 1);
if (!e) {
bad = InternalError;
break;
}
strncpy(e, envp[i], len);
e[len] = 0;
if (len >= 4 &&
(strcmp(e + len - 4, "PATH") == 0 ||
strcmp(e, "TERMCAP") == 0)) {
if (strlen(envp[i]) > MAX_ENV_PATH_LENGTH) {
bad = EnvTooLong;
break;
} else {
free(e);
}
} else {
bad = EnvTooLong;
break;
}
#endif
}
}
}
#if NO_OUTPUT_PIPES
if (!bad) {
struct stat buf;
if (fstat(fileno(stdout), &buf) == 0 && S_ISFIFO(buf.st_mode))
bad = OutputIsPipe;
if (fstat(fileno(stderr), &buf) == 0 && S_ISFIFO(buf.st_mode))
bad = OutputIsPipe;
}
#endif
}
switch (bad) {
case NotBad:
return;
case UnsafeArg:
ErrorF("Command line argument number %d is unsafe\n", i);
ErrorF(ARGMSG, BUGADDRESS);
break;
case ArgTooLong:
ErrorF("Command line argument number %d is too long\n", i);
ErrorF(ARGMSG, BUGADDRESS);
break;
case UnprintableArg:
ErrorF("Command line argument number %d contains unprintable"
" characters\n", i);
ErrorF(ARGMSG, BUGADDRESS);
break;
case EnvTooLong:
ErrorF("Environment variable `%s' is too long\n", e);
ErrorF(ENVMSG, BUGADDRESS);
break;
case OutputIsPipe:
ErrorF("Stdout and/or stderr is a pipe\n");
break;
case InternalError:
ErrorF("Internal Error\n");
break;
default:
ErrorF("Unknown error\n");
ErrorF(ARGMSG, BUGADDRESS);
ErrorF(ENVMSG, BUGADDRESS);
break;
}
FatalError("X server aborted because of unsafe environment\n");
}
/*
* CheckUserAuthorization: check if the user is allowed to start the
* X server. This usually means some sort of PAM checking, and it is
* usually only done for setuid servers (uid != euid).
*/
#ifdef USE_PAM
#include <security/pam_appl.h>
#include <security/pam_misc.h>
#include <pwd.h>
#endif /* USE_PAM */
void
CheckUserAuthorization(void)
{
#ifdef USE_PAM
static struct pam_conv conv = {
misc_conv,
NULL
};
pam_handle_t *pamh = NULL;
struct passwd *pw;
int retval;
if (getuid() != geteuid()) {
pw = getpwuid(getuid());
if (pw == NULL)
FatalError("getpwuid() failed for uid %d\n", getuid());
retval = pam_start("xserver", pw->pw_name, &conv, &pamh);
if (retval != PAM_SUCCESS)
FatalError("pam_start() failed.\n"
"\tMissing or mangled PAM config file or module?\n");
retval = pam_authenticate(pamh, 0);
if (retval != PAM_SUCCESS) {
pam_end(pamh, retval);
FatalError("PAM authentication failed, cannot start X server.\n"
"\tPerhaps you do not have console ownership?\n");
}
retval = pam_acct_mgmt(pamh, 0);
if (retval != PAM_SUCCESS) {
pam_end(pamh, retval);
FatalError("PAM authentication failed, cannot start X server.\n"
"\tPerhaps you do not have console ownership?\n");
}
/* this is not a session, so do not do session management */
pam_end(pamh, PAM_SUCCESS);
}
#endif
}
#ifdef __SCO__
#include <fcntl.h>
static void
lockit (int fd, short what)
{
struct flock lck;
lck.l_whence = 0;
lck.l_start = 0;
lck.l_len = 1;
lck.l_type = what;
(void)fcntl (fd, F_SETLKW, &lck);
}
/* SCO OpenServer 5 lacks pread/pwrite. Emulate them. */
ssize_t
pread (int fd, void *buf, size_t nbytes, off_t offset)
{
off_t saved;
ssize_t ret;
lockit (fd, F_RDLCK);
saved = lseek (fd, 0, SEEK_CUR);
lseek (fd, offset, SEEK_SET);
ret = read (fd, buf, nbytes);
lseek (fd, saved, SEEK_SET);
lockit (fd, F_UNLCK);
return ret;
}
ssize_t
pwrite (int fd, const void *buf, size_t nbytes, off_t offset)
{
off_t saved;
ssize_t ret;
lockit (fd, F_WRLCK);
saved = lseek (fd, 0, SEEK_CUR);
lseek (fd, offset, SEEK_SET);
ret = write (fd, buf, nbytes);
lseek (fd, saved, SEEK_SET);
lockit (fd, F_UNLCK);
return ret;
}
#endif /* __SCO__ */
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