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xenocara/xserver/os/utils.c
matthieu 1a66cad3fb Update to xserver 1.19.5. 
Tested by bru@, jsg@ and others
2017-12-08 15:01:59 +00:00

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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>
/*
Sigh... We really need a prototype for this to know it is stdcall,
but #include-ing <windows.h> here is not a good idea...
*/
__stdcall unsigned long GetTickCount(void);
#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 <X11/fonts/libxfont2.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(_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)
#include <sys/resource.h>
#endif
#include <sys/stat.h>
#include <ctype.h> /* for isspace */
#include <stdarg.h>
#include <stdlib.h> /* for malloc() */
#if defined(TCPCONN)
#ifndef WIN32
#include <netdb.h>
#endif
#endif
#include "opaque.h"
#include "dixstruct.h"
#include "xkbsrv.h"
#include "picture.h"
Bool noTestExtensions;
#ifdef COMPOSITE
Bool noCompositeExtension = FALSE;
#endif
#ifdef DAMAGE
Bool noDamageExtension = FALSE;
#endif
#ifdef DBE
Bool noDbeExtension = FALSE;
#endif
#ifdef DPMSExtension
Bool noDPMSExtension = FALSE;
#endif
#ifdef GLXEXT
Bool noGlxExtension = FALSE;
#endif
#ifdef SCREENSAVER
Bool noScreenSaverExtension = FALSE;
#endif
#ifdef MITSHM
Bool noMITShmExtension = FALSE;
#endif
#ifdef RANDR
Bool noRRExtension = FALSE;
#endif
Bool noRenderExtension = FALSE;
#ifdef XCSECURITY
Bool noSecurityExtension = FALSE;
#endif
#ifdef RES
Bool noResExtension = FALSE;
#endif
#ifdef XF86BIGFONT
Bool noXFree86BigfontExtension = FALSE;
#endif
#ifdef XFreeXDGA
Bool noXFree86DGAExtension = FALSE;
#endif
#ifdef XF86DRI
Bool noXFree86DRIExtension = FALSE;
#endif
#ifdef XF86VIDMODE
Bool noXFree86VidModeExtension = FALSE;
#endif
Bool noXFixesExtension = FALSE;
#ifdef PANORAMIX
/* Xinerama is disabled by default unless enabled via +xinerama */
Bool noPanoramiXExtension = TRUE;
#endif
#ifdef XSELINUX
Bool noSELinuxExtension = FALSE;
int selinuxEnforcingState = SELINUX_MODE_DEFAULT;
#endif
#ifdef XV
Bool noXvExtension = FALSE;
#endif
#ifdef DRI2
Bool noDRI2Extension = FALSE;
#endif
Bool noGEExtension = FALSE;
#define X_INCLUDE_NETDB_H
#include <X11/Xos_r.h>
#include <errno.h>
Bool CoreDump;
Bool enableIndirectGLX = FALSE;
#ifdef PANORAMIX
Bool PanoramiXExtensionDisabledHack = FALSE;
#endif
int auditTrailLevel = 1;
char *SeatId = NULL;
sig_atomic_t inSignalContext = FALSE;
#if defined(SVR4) || defined(__linux__) || defined(CSRG_BASED)
#define HAS_SAVED_IDS_AND_SETEUID
#endif
#ifdef MONOTONIC_CLOCK
static clockid_t clockid;
#endif
OsSigHandlerPtr
OsSignal(int sig, OsSigHandlerPtr handler)
{
#if defined(WIN32) && !defined(__CYGWIN__)
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;
if (sigaction(sig, &act, &oact))
perror("sigaction");
return oact.sa_handler;
#endif
}
/*
* 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(WIN32) || defined(__CYGWIN__)
#define LOCK_SERVER
#endif
#ifndef LOCK_SERVER
void
LockServer(void)
{}
void
UnlockServer(void)
{}
#else /* LOCK_SERVER */
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;
const char *tmppath = LOCK_DIR;
int len;
char port[20];
if (nolock || NoListenAll)
return;
/*
* Path names
*/
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) sprintf(tmp, "%s" LOCK_TMP_PREFIX "%s" LOCK_SUFFIX, tmppath, port);
(void) sprintf(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);
snprintf(pid_str, sizeof(pid_str), "%10lu\n", (unsigned long) getpid());
if (write(lfd, pid_str, 11) != 11)
FatalError("Could not write pid to lock file in %s\n", tmp);
#ifdef __OpenBSD__
/* if possible give away the lock file to the real uid/gid */
fchown(lfd, getuid(), getgid());
#endif
(void) fchmod(lfd, 0444);
(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 | O_NOFOLLOW);
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 || NoListenAll)
return;
if (!StillLocking) {
(void) unlink(LockFile);
}
}
#endif /* LOCK_SERVER */
#ifdef X_PRIVSEP
int
ChownLock(uid_t uid, gid_t gid)
{
return chown(LockFile, uid, gid);
}
#endif
/* Force connections to close on SIGHUP from init */
void
AutoResetServer(int sig)
{
int olderrno = errno;
dispatchException |= DE_RESET;
isItTimeToYield = TRUE;
errno = olderrno;
}
/* Force connections to close and then exit on SIGTERM, SIGINT */
void
GiveUp(int sig)
{
int olderrno = errno;
dispatchException |= DE_TERMINATE;
isItTimeToYield = TRUE;
errno = olderrno;
}
#ifdef MONOTONIC_CLOCK
void
ForceClockId(clockid_t forced_clockid)
{
struct timespec tp;
BUG_RETURN (clockid);
clockid = forced_clockid;
if (clock_gettime(clockid, &tp) != 0) {
FatalError("Forced clock id failed to retrieve current time: %s\n",
strerror(errno));
return;
}
}
#endif
#if (defined WIN32 && defined __MINGW32__) || defined(__CYGWIN__)
CARD32
GetTimeInMillis(void)
{
return GetTickCount();
}
CARD64
GetTimeInMicros(void)
{
return (CARD64) GetTickCount() * 1000;
}
#else
CARD32
GetTimeInMillis(void)
{
struct timeval tv;
#ifdef MONOTONIC_CLOCK
struct timespec tp;
if (!clockid) {
#ifdef CLOCK_MONOTONIC_COARSE
if (clock_getres(CLOCK_MONOTONIC_COARSE, &tp) == 0 &&
(tp.tv_nsec / 1000) <= 1000 &&
clock_gettime(CLOCK_MONOTONIC_COARSE, &tp) == 0)
clockid = CLOCK_MONOTONIC_COARSE;
else
#endif
if (clock_gettime(CLOCK_MONOTONIC, &tp) == 0)
clockid = CLOCK_MONOTONIC;
else
clockid = ~0L;
}
if (clockid != ~0L && clock_gettime(clockid, &tp) == 0)
return (tp.tv_sec * 1000) + (tp.tv_nsec / 1000000L);
#endif
X_GETTIMEOFDAY(&tv);
return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
}
CARD64
GetTimeInMicros(void)
{
struct timeval tv;
#ifdef MONOTONIC_CLOCK
struct timespec tp;
if (!clockid) {
if (clock_gettime(CLOCK_MONOTONIC, &tp) == 0)
clockid = CLOCK_MONOTONIC;
else
clockid = ~0L;
}
if (clockid != ~0L && clock_gettime(clockid, &tp) == 0)
return (CARD64) tp.tv_sec * (CARD64)1000000 + tp.tv_nsec / 1000;
#endif
X_GETTIMEOFDAY(&tv);
return (CARD64) tv.tv_sec * (CARD64)1000000000 + (CARD64) tv.tv_usec * 1000;
}
#endif
void
UseMsg(void)
{
ErrorF("use: X [:<display>] [option]\n");
ErrorF("-a # default pointer acceleration (factor)\n");
ErrorF("-ac disable access control restrictions\n");
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("-nocursor disable the cursor\n");
ErrorF("-core generate core dump on fatal error\n");
ErrorF("-displayfd fd file descriptor to write display number to when ready to connect\n");
ErrorF("-dpi int screen resolution in dots per inch\n");
#ifdef DPMSExtension
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("+iglx Allow creating indirect GLX contexts\n");
ErrorF("-iglx Prohibit creating indirect GLX contexts (default)\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 LOCK_SERVER
ErrorF("-nolock disable the locking mechanism\n");
#endif
ErrorF("-maxclients n set maximum number of clients (power of two)\n");
ErrorF("-nolisten string don't listen on protocol\n");
ErrorF("-listen string listen on protocol\n");
ErrorF("-noreset don't reset after last client exists\n");
ErrorF("-background [none] create root window with no background\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");
ErrorF("-render [default|mono|gray|color] set render color alloc policy\n");
#ifndef __OpenBSD__
ErrorF("-retro start with classic stipple and cursor\n");
#else
ErrorF("-retard start with black background and no cursor\n");
#endif
ErrorF("-s # screen-saver timeout (minutes)\n");
ErrorF("-seat string seat to run on\n");
ErrorF("-t # default pointer threshold (pixels/t)\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("-maxbigreqsize set maximal bigrequest size \n");
#ifdef PANORAMIX
ErrorF("+xinerama Enable XINERAMA extension\n");
ErrorF("-xinerama Disable XINERAMA extension\n");
#endif
ErrorF
("-dumbSched Disable smart scheduling and threaded input, enable old behavior\n");
ErrorF("-schedInterval int Set scheduler interval in msec\n");
ErrorF("-sigstop Enable SIGSTOP based startup\n");
ErrorF("+extension name Enable extension\n");
ErrorF("-extension name Disable extension\n");
#ifdef XDMCP
XdmcpUseMsg();
#endif
XkbUseMsg();
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)
{
int i;
int period_found = FALSE;
int after_period = 0;
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!!! */
/* Since we run atoi() on the display later, only allow
for digits, or exception of :0.0 and similar (two decimal points max)
*/
for (i = 0; i < strlen(d); i++) {
if (!isdigit(d[i])) {
if (d[i] != '.' || period_found)
return 0;
period_found = TRUE;
} else if (period_found)
after_period++;
if (after_period > 2)
return 0;
}
/* don't allow for :0. */
if (period_found && after_period == 0)
return 0;
if (atol(d) > INT_MAX)
return 0;
return 1;
}
static const char *defaultNoListenList[] = {
#ifndef LISTEN_TCP
"tcp",
#endif
#ifndef LISTEN_UNIX
"unix",
#endif
#ifndef LISTEN_LOCAL
"local",
#endif
NULL
};
/*
* 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 = 0; defaultNoListenList[i] != NULL; i++) {
if (_XSERVTransNoListen(defaultNoListenList[i]))
ErrorF("Failed to disable listen for %s transport",
defaultNoListenList[i]);
}
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];
explicit_display = TRUE;
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;
}
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); /* default */
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], "-core") == 0) {
#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
CoreDump = TRUE;
}
else if (strcmp(argv[i], "-nocursor") == 0) {
EnableCursor = FALSE;
}
else if (strcmp(argv[i], "-dpi") == 0) {
if (++i < argc)
monitorResolution = atoi(argv[i]);
else
UseMsg();
}
else if (strcmp(argv[i], "-displayfd") == 0) {
if (++i < argc) {
displayfd = atoi(argv[i]);
#ifdef LOCK_SERVER
nolock = TRUE;
#endif
}
else
UseMsg();
}
#ifdef DPMSExtension
else if (strcmp(argv[i], "dpms") == 0)
/* ignored for compatibility */ ;
else if (strcmp(argv[i], "-dpms") == 0)
DPMSDisabledSwitch = TRUE;
#endif
else if (strcmp(argv[i], "-deferglyphs") == 0) {
if (++i >= argc || !xfont2_parse_glyph_caching_mode(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);
}
else if (strcmp(argv[i], "+iglx") == 0)
enableIndirectGLX = TRUE;
else if (strcmp(argv[i], "-iglx") == 0)
enableIndirectGLX = FALSE;
else if ((skip = XkbProcessArguments(argc, argv, i)) != 0) {
if (skip > 0)
i += skip - 1;
else
UseMsg();
}
#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 LOCK_SERVER
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
else if ( strcmp( argv[i], "-maxclients") == 0)
{
if (++i < argc) {
LimitClients = atoi(argv[i]);
if (LimitClients != 64 &&
LimitClients != 128 &&
LimitClients != 256 &&
LimitClients != 512 &&
LimitClients != 1024 &&
LimitClients != 2048) {
FatalError("maxclients must be one of 64, 128, 256, 512, 1024 or 2048\n");
}
} else
UseMsg();
}
else if (strcmp(argv[i], "-nolisten") == 0) {
if (++i < argc) {
if (_XSERVTransNoListen(argv[i]))
ErrorF("Failed to disable listen for %s transport",
argv[i]);
}
else
UseMsg();
}
else if (strcmp(argv[i], "-listen") == 0) {
if (++i < argc) {
if (_XSERVTransListen(argv[i]))
ErrorF("Failed to enable 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], "-pogo") == 0) {
dispatchException = DE_TERMINATE;
}
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;
#ifndef __OpenBSD__
else if ( strcmp( argv[i], "-retro") == 0)
party_like_its_1989 = TRUE;
#else
else if ( strcmp( argv[i], "-retard") == 0)
party_like_its_1989 = FALSE;
#endif
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], "-seat") == 0) {
if (++i < argc)
SeatId = argv[i];
else
UseMsg();
}
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], "-background") == 0) {
if (++i < argc) {
if (!strcmp(argv[i], "none"))
bgNoneRoot = TRUE;
else
UseMsg();
}
}
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], "-I") == 0) {
/* ignore all remaining arguments */
break;
}
else if (strncmp(argv[i], "tty", 3) == 0) {
/* init supplies us with this useless information */
}
#ifdef XDMCP
else if ((skip = XdmcpOptions(argc, argv, i)) != i) {
i = skip - 1;
}
#endif
else if (strcmp(argv[i], "-dumbSched") == 0) {
InputThreadEnable = FALSE;
#if HAVE_SETITIMER
SmartScheduleSignalEnable = FALSE;
#endif
}
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();
}
else if (strcmp(argv[i], "-render") == 0) {
if (++i < argc) {
int policy = PictureParseCmapPolicy(argv[i]);
if (policy != PictureCmapPolicyInvalid)
PictureCmapPolicy = policy;
else
UseMsg();
}
else
UseMsg();
}
else if (strcmp(argv[i], "-sigstop") == 0) {
RunFromSigStopParent = TRUE;
}
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]);
}
}
}
/* 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, void *client)
{
#define AUTHORIZATION_NAME "hp-hostname-1"
#if defined(TCPCONN)
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)
memset(&hints, 0, 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 = malloc(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 */
}
void *
XNFalloc(unsigned long amount)
{
void *ptr = malloc(amount);
if (!ptr)
FatalError("Out of memory");
return ptr;
}
/* The original XNFcalloc was used with the xnfcalloc macro which multiplied
* the arguments at the call site without allowing calloc to check for overflow.
* XNFcallocarray was added to fix that without breaking ABI.
*/
void *
XNFcalloc(unsigned long amount)
{
return XNFcallocarray(1, amount);
}
void *
XNFcallocarray(size_t nmemb, size_t size)
{
void *ret = calloc(nmemb, size);
if (!ret)
FatalError("XNFcalloc: Out of memory");
return ret;
}
void *
XNFrealloc(void *ptr, unsigned long amount)
{
void *ret = realloc(ptr, amount);
if (!ret)
FatalError("XNFrealloc: Out of memory");
return ret;
}
void *
XNFreallocarray(void *ptr, size_t nmemb, size_t size)
{
void *ret = reallocarray(ptr, nmemb, size);
if (!ret)
FatalError("XNFreallocarray: Out of memory");
return ret;
}
char *
Xstrdup(const char *s)
{
if (s == NULL)
return NULL;
return strdup(s);
}
char *
XNFstrdup(const char *s)
{
char *ret;
if (s == NULL)
return NULL;
ret = strdup(s);
if (!ret)
FatalError("XNFstrdup: Out of memory");
return ret;
}
void
SmartScheduleStopTimer(void)
{
#if HAVE_SETITIMER
struct itimerval timer;
if (!SmartScheduleSignalEnable)
return;
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);
#endif
}
void
SmartScheduleStartTimer(void)
{
#if HAVE_SETITIMER
struct itimerval timer;
if (!SmartScheduleSignalEnable)
return;
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;
setitimer(ITIMER_REAL, &timer, 0);
#endif
}
#if HAVE_SETITIMER
static void
SmartScheduleTimer(int sig)
{
SmartScheduleTime += SmartScheduleInterval;
}
static int
SmartScheduleEnable(void)
{
int ret = 0;
struct sigaction act;
if (!SmartScheduleSignalEnable)
return 0;
memset((char *) &act, 0, sizeof(struct sigaction));
/* Set up the timer signal function */
act.sa_flags = SA_RESTART;
act.sa_handler = SmartScheduleTimer;
sigemptyset(&act.sa_mask);
sigaddset(&act.sa_mask, SIGALRM);
ret = sigaction(SIGALRM, &act, 0);
return ret;
}
static int
SmartSchedulePause(void)
{
int ret = 0;
struct sigaction act;
if (!SmartScheduleSignalEnable)
return 0;
memset((char *) &act, 0, sizeof(struct sigaction));
act.sa_handler = SIG_IGN;
sigemptyset(&act.sa_mask);
ret = sigaction(SIGALRM, &act, 0);
return ret;
}
#endif
void
SmartScheduleInit(void)
{
#if HAVE_SETITIMER
if (SmartScheduleEnable() < 0) {
perror("sigaction for smart scheduler");
SmartScheduleSignalEnable = FALSE;
}
#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);
sigaddset(&set, SIGALRM);
sigaddset(&set, SIGVTALRM);
#ifdef SIGWINCH
sigaddset(&set, SIGWINCH);
#endif
sigaddset(&set, SIGTSTP);
sigaddset(&set, SIGTTIN);
sigaddset(&set, SIGTTOU);
sigaddset(&set, SIGCHLD);
xthread_sigmask(SIG_BLOCK, &set, &PreviousSignalMask);
}
#endif
}
void
OsReleaseSignals(void)
{
#ifdef SIG_BLOCK
if (--BlockedSignalCount == 0) {
xthread_sigmask(SIG_SETMASK, &PreviousSignalMask, 0);
}
#endif
}
void
OsResetSignals(void)
{
#ifdef SIG_BLOCK
while (BlockedSignalCount > 0)
OsReleaseSignals();
input_force_unlock();
#endif
}
/*
* Pending signals may interfere with core dumping. Provide a
* mechanism to block signals when aborting.
*/
void
OsAbort(void)
{
#ifndef __APPLE__
OsBlockSignals();
#endif
#if !defined(WIN32) || defined(__CYGWIN__)
/* abort() raises SIGABRT, so we have to stop handling that to prevent
* recursion
*/
OsSignal(SIGABRT, SIG_DFL);
#endif
abort();
}
#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(const char *command)
{
int pid, p;
void (*csig) (int);
int status;
if (!command)
return 1;
csig = OsSignal(SIGCHLD, SIG_DFL);
if (csig == SIG_ERR) {
perror("signal");
return -1;
}
DebugF("System: `%s'\n", command);
switch (pid = fork()) {
case -1: /* error */
p = -1;
break;
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);
}
if (OsSignal(SIGCHLD, csig) == SIG_ERR) {
perror("signal");
return -1;
}
return p == -1 ? -1 : status;
}
static struct pid {
struct pid *next;
FILE *fp;
int pid;
} *pidlist;
void *
Popen(const char *command, const 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 = malloc(sizeof(struct pid))) == NULL)
return NULL;
if (pipe(pdes) < 0) {
free(cur);
return NULL;
}
/* Ignore the smart scheduler while this is going on */
#if HAVE_SETITIMER
if (SmartSchedulePause() < 0) {
close(pdes[0]);
close(pdes[1]);
free(cur);
perror("signal");
return NULL;
}
#endif
switch (pid = fork()) {
case -1: /* error */
close(pdes[0]);
close(pdes[1]);
free(cur);
#if HAVE_SETITIMER
if (SmartScheduleEnable() < 0)
perror("signal");
#endif
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;
DebugF("Popen: `%s', fp = %p\n", command, iop);
return iop;
}
/* fopen that drops privileges */
void *
Fopen(const char *file, const 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 = malloc(sizeof(struct pid))) == NULL)
return NULL;
if (pipe(pdes) < 0) {
free(cur);
return NULL;
}
switch (pid = fork()) {
case -1: /* error */
close(pdes[0]);
close(pdes[1]);
free(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;
DebugF("Fopen(%s), fp = %p\n", file, iop);
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(void *iop)
{
struct pid *cur, *last;
int pstat;
int pid;
DebugF("Pclose: fp = %p\n", iop);
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;
free(cur);
/* allow EINTR again */
OsReleaseSignals();
#if HAVE_SETITIMER
if (SmartScheduleEnable() < 0) {
perror("signal");
return -1;
}
#endif
return pid == -1 ? -1 : pstat;
}
int
Fclose(void *iop)
{
#ifdef HAS_SAVED_IDS_AND_SETEUID
return fclose(iop);
#else
return Pclose(iop);
#endif
}
#endif /* !WIN32 */
#ifdef WIN32
#include <X11/Xwindows.h>
const char *
Win32TempDir(void)
{
static char buffer[PATH_MAX];
if (GetTempPath(sizeof(buffer), buffer)) {
int len;
buffer[sizeof(buffer) - 1] = 0;
len = strlen(buffer);
if (len > 0)
if (buffer[len - 1] == '\\')
buffer[len - 1] = 0;
return buffer;
}
if (getenv("TEMP") != NULL)
return getenv("TEMP");
else if (getenv("TMP") != NULL)
return getenv("TMP");
else
return "/tmp";
}
int
System(const char *cmdline)
{
STARTUPINFO si;
PROCESS_INFORMATION pi;
DWORD dwExitCode;
char *cmd = strdup(cmdline);
ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
ZeroMemory(&pi, sizeof(pi));
if (!CreateProcess(NULL, cmd, NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi)) {
LPVOID buffer;
if (!FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &buffer, 0, NULL)) {
ErrorF("[xkb] Starting '%s' failed!\n", cmdline);
}
else {
ErrorF("[xkb] Starting '%s' failed: %s", cmdline, (char *) buffer);
LocalFree(buffer);
}
free(cmd);
return -1;
}
/* Wait until child process exits. */
WaitForSingleObject(pi.hProcess, INFINITE);
GetExitCodeProcess(pi.hProcess, &dwExitCode);
/* Close process and thread handles. */
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
free(cmd);
return dwExitCode;
}
#endif
/*
* 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
void
CheckUserParameters(int argc, char **argv, char **envp)
{
enum BadCode bad = NotBad;
int i = 0, j;
char *a, *e = NULL;
#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)) {
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
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 = strndup(envp[i], len);
if (!e) {
bad = InternalError;
break;
}
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);
break;
case ArgTooLong:
ErrorF("Command line argument number %d is too long\n", i);
break;
case UnprintableArg:
ErrorF("Command line argument number %d contains unprintable"
" characters\n", i);
break;
case EnvTooLong:
ErrorF("Environment variable `%s' is too long\n", e);
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");
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
}
/*
* Tokenize a string into a NULL terminated array of strings. Always returns
* an allocated array unless an error occurs.
*/
char **
xstrtokenize(const char *str, const char *separators)
{
char **list, **nlist;
char *tok, *tmp;
unsigned num = 0, n;
if (!str)
return NULL;
list = calloc(1, sizeof(*list));
if (!list)
return NULL;
tmp = strdup(str);
if (!tmp)
goto error;
for (tok = strtok(tmp, separators); tok; tok = strtok(NULL, separators)) {
nlist = reallocarray(list, num + 2, sizeof(*list));
if (!nlist)
goto error;
list = nlist;
list[num] = strdup(tok);
if (!list[num])
goto error;
list[++num] = NULL;
}
free(tmp);
return list;
error:
free(tmp);
for (n = 0; n < num; n++)
free(list[n]);
free(list);
return NULL;
}
/* Format a signed number into a string in a signal safe manner. The string
* should be at least 21 characters in order to handle all int64_t values.
*/
void
FormatInt64(int64_t num, char *string)
{
if (num < 0) {
string[0] = '-';
num *= -1;
string++;
}
FormatUInt64(num, string);
}
/* Format a number into a string in a signal safe manner. The string should be
* at least 21 characters in order to handle all uint64_t values. */
void
FormatUInt64(uint64_t num, char *string)
{
uint64_t divisor;
int len;
int i;
for (len = 1, divisor = 10;
len < 20 && num / divisor;
len++, divisor *= 10);
for (i = len, divisor = 1; i > 0; i--, divisor *= 10)
string[i - 1] = '0' + ((num / divisor) % 10);
string[len] = '\0';
}
/**
* Format a double number as %.2f.
*/
void
FormatDouble(double dbl, char *string)
{
int slen = 0;
uint64_t frac;
frac = (dbl > 0 ? dbl : -dbl) * 100.0 + 0.5;
frac %= 100;
/* write decimal part to string */
if (dbl < 0 && dbl > -1)
string[slen++] = '-';
FormatInt64((int64_t)dbl, &string[slen]);
while(string[slen] != '\0')
slen++;
/* append fractional part, but only if we have enough characters. We
* expect string to be 21 chars (incl trailing \0) */
if (slen <= 17) {
string[slen++] = '.';
if (frac < 10)
string[slen++] = '0';
FormatUInt64(frac, &string[slen]);
}
}
/* Format a number into a hexadecimal string in a signal safe manner. The string
* should be at least 17 characters in order to handle all uint64_t values. */
void
FormatUInt64Hex(uint64_t num, char *string)
{
uint64_t divisor;
int len;
int i;
for (len = 1, divisor = 0x10;
len < 16 && num / divisor;
len++, divisor *= 0x10);
for (i = len, divisor = 1; i > 0; i--, divisor *= 0x10) {
int val = (num / divisor) % 0x10;
if (val < 10)
string[i - 1] = '0' + val;
else
string[i - 1] = 'a' + val - 10;
}
string[len] = '\0';
}
#if !defined(WIN32) || defined(__CYGWIN__)
/* Move a file descriptor out of the way of our select mask; this
* is useful for file descriptors which will never appear in the
* select mask to avoid reducing the number of clients that can
* connect to the server
*/
int
os_move_fd(int fd)
{
int newfd;
#ifdef F_DUPFD_CLOEXEC
newfd = fcntl(fd, F_DUPFD_CLOEXEC, MAXCLIENTS);
#else
newfd = fcntl(fd, F_DUPFD, MAXCLIENTS);
#endif
if (newfd < 0)
return fd;
#ifndef F_DUPFD_CLOEXEC
fcntl(newfd, F_SETFD, FD_CLOEXEC);
#endif
close(fd);
return newfd;
}
#endif
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