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x11vnc: rename -create_x to -create_xsrv. Hopefully done fixing Xdummy.

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pull/1/head
runge 15 years ago
parent 5764cd3fdd
commit a795da8d7b
7 changed files with 955 additions and 829 deletions
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4
x11vnc/ChangeLog
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@ -1,3 +1,7 @@
2009-12-29 Karl Runge <runge@karlrunge.com>
* x11vnc: rename -create_x to -create_xsrv. Hopefully
done fixing Xdummy.
2009-12-28 Karl Runge <runge@karlrunge.com>
* x11vnc: Fix problems in --without-x builds. Fix crash
with -QD query for dbus info. Adjust window size for

1434
x11vnc/README
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File diff suppressed because it is too large Load Diff

3
x11vnc/help.c
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@ -1119,9 +1119,10 @@ void print_help(int mode) {
"-xvnc_redirect As in -create, except Xvnc.redirect instead of Xvfb.\n"
"-xdummy_xvfb Sets WAIT:cmd=FINDCREATEDISPLAY-Xdummy,Xvfb\n"
"\n"
"-create_x str Sets WAIT:cmd=FINDCREATEDISPLAY-<str> Can be on cmdline\n"
"-create_xsrv str Sets WAIT:cmd=FINDCREATEDISPLAY-<str> Can be on cmdline\n"
" after anything that sets WAIT:.. and other things\n"
" (e.g. -svc, -xdmsvc) to adjust the X server list.\n"
" Example: -svc ... -create_xsrv Xdummy,X\n"
"\n"
"-svc Terminal services mode based on SSL access. Alias for\n"
" -display WAIT:cmd=FINDCREATEDISPLAY-Xvfb -unixpw -users\n"

326
x11vnc/misc/Xdummy
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@ -5,17 +5,19 @@
#
# Run "Xdummy -help" for more info.
#
xserver=""
geom=""
geom=""
install=""
uninstall=""
runit=1
prconf=""
notweak=""
root=""
nosudo=""
xserver=""
geom=""
depth=""
debug=""
strace=""
runit=1
prconf=""
noconf=""
cmdline_config=""
PATH=$PATH:/bin:/usr/bin
export PATH
@ -24,55 +26,62 @@ program=`basename "$0"`
help () {
${PAGER:-more} << END
$program:
$program: a hack to run a stock Xorg(1) or XFree86(1) X server with the
"dummy" video driver such that it AVOIDS the Linux VT switching, keyboard
mouse conflicts, etc associated with normal use of "dummy".
A hack to run a stock Xorg(1) or XFree86(1) X server with the "dummy"
(RAM-only framebuffer) video driver such that it AVOIDS the Linux VT
switching, opening device files in /dev, keyboard and mouse conflicts,
and other problems associated with the normal use of "dummy".
In other words, try to make Xorg/XFree86 with the Device "dummy" driver
act more like Xvfb(1).
In other words, it tries to make Xorg/XFree86 with the "dummy"
device driver act more like Xvfb(1).
To achieve this, while running the real Xserver $program intercepts system
and library calls via the LD_PRELOAD method and modifies the behavior
to make it work correctly (i.e. avoid the VT stuff). LD_PRELOAD tricks
are usually "clever hacks" and so might not work in all situations or
break when something changes.
The primary motivation for the Xdummy script is to provide a virtual X
server for x11vnc but with more features than Xvfb (or Xvnc); however
it could be used for other reasons (e.g. better automated testing
than with Xvfb.) One nice thing is the dummy server supports RANDR
dynamic resizing while Xvfb does not.
The primary motivation for the Xdummy script is to provide a virtual X
server for x11vnc but with more features than Xvfb (or Xvnc), however
it could be used for other reasons (e.g. better automated testing than
with Xvfb). A nice by-product is the dummy server supports RANDR dynamic
resizing while Xvfb does not. So, for example x11vnc+Xdummy terminal
services are a little better than x11vnc+Xvfb.
So, for example, x11vnc+Xdummy terminal services are a little better
than x11vnc+Xvfb.
This program does not need to be run as root as of 12/2009. However,
if there are problems for certain situations it may perform better
if run as root (-root option.)
To achieve this, while running the real Xserver $program intercepts
system and library calls via the LD_PRELOAD method and modifies
the behavior to make it work correctly (e.g. avoid the VT stuff.)
LD_PRELOAD tricks are usually "clever hacks" and so might not work
in all situations or break when something changes.
Also, gcc/cc is required to compile the LD_PRELOAD shared object.
See -install and -uninstall described below.
This program does not need to be run as root as of 12/2009. However,
if there are problems for certain situations (usually older servers)
it may perform better if run as root (use the -root option.)
Also, gcc/cc and other build tools are required for this script to
be able to compile the LD_PRELOAD shared object. Be sure they are
installed on the system. See -install and -uninstall described below.
Your Linux distribution may not install the dummy driver by default, e.g:
Your Linux distribution may not install the dummy driver by default,
e.g:
/usr/lib/xorg/modules/drivers/dummy_drv.so
some have it in a package named xserver-xorg-video-dummy you need
to install.
some have it in a package named xserver-xorg-video-dummy you that
need to install.
Usage:
$program <${program}-args> [--] <Xserver-args>
$program <${program}-args> <Xserver-args>
(actually, the arguments can be supplied in any order.)
Examples:
$program -install
$program :1
$program -debug -tmpdir ~/mytmp :1
$program -debug :1
$program -install
$program -tmpdir ~/mytmp :1 -nolisten tcp
startx example:
@ -95,6 +104,8 @@ xdm example:
:1 local /usr/local/dummy/Xdummy :1 -debug
:2 local /usr/local/dummy/Xdummy :2 -debug
(-debug is optional)
gdm/kdm example:
TBD.
@ -102,11 +113,12 @@ gdm/kdm example:
Root permission and x11vnc:
Update: as of 12/2009 this program no longer must be run as root.
So try it as non-root before running it as root and/or the
following schemes.
However, in some circumstances program may need to be run as
root. If so, one could run x11vnc as root with -unixpw (it
switches to the user that logs in) and that may be OK, some
other ideas:
In some circumstances X server program may need to be run as root.
If so, one could run x11vnc as root with -unixpw (it switches
to the user that logs in) and that may be OK, some other ideas:
- add this to sudo via visudo:
@ -145,25 +157,38 @@ Options:
${program}-args:
-install Compile the LD_PRELOAD shared object and install it
next to the $program script file as: $0.so
next to the $program script file as:
$0.so
When that file exists it is used as the LD_PRELOAD
shared object without recompiling. Otherwise,
each time $program is run the LD_PRELOAD shared
object is compiled as a file in /tmp (or -tmpdir).
object is compiled as a file in /tmp (or -tmpdir)
If you set the environment variable
INTERPOSE_GETUID=1 when building, then when
$program is run as an ordinary user, the shared
object will interpose getuid() calls and pretend
to be root. Otherwise it doesn't pretend to
be root.
You can also set the CFLAGS environment variable
to anything else you want on the compile cmdline.
-uninstall Remove the file:
$0.so
-uninstall Remove the file: $0.so
The LD_PRELOAD shared object will then be compiled
each time this program is run.
Note: the X server is not started under -install or -uninstall.
The X server is not started under -install, -uninstall, or -prconf.
:N The DISPLAY can be the first $program argument.
It is passed to the real X server. This is to
aid use with startx(1), xinit(1), xdm(1), etc.
If one is not provided it tries to choose one
automatically.
:N The DISPLAY (e.g. :15) is often the first
argument. It is passed to the real X server and
also used by the Xdummy script as an identifier.
-geom geom1[,geom2...] Take the geometry (e.g. 1024x768) or
list of geometries and insert them into the
@ -171,6 +196,13 @@ Options:
config file. Use this to have a smaller geometry
than the one in the system config file.
-depth n Use pixel color depth n (e.g. 8, 16, or 24). This
makes sure the X config file has a Screen.Display
subsection of this depth. Note this option is
ALSO passed to the X server.
-DEPTH n Same as -depth, except not passed to X server.
-tmpdir dir Specify a temporary directory, owned by you and
only writable by you. This is used in place of
/tmp/Xdummy.\$USER/.. to place the $program.so
@ -179,56 +211,70 @@ Options:
-nonroot Run in non-root mode (working 12/2009, now default)
-root Run as root (may still be needed in some
environments.)
environments.) Same as XDUMMY_RUN_AS_ROOT=1.
-nosudo Do not try to use sudo(1) when re-running as root,
use su(1) instead.
-xserver path Specify the path to the Xserver to use. Default
is to try "Xorg" first and then "XFree86". If
those are not in \$PATH, use these locations:
those are not in \$PATH, it tries these locations:
/usr/bin/Xorg
/usr/X11R6/bin/Xorg
/usr/X11R6/bin/XFree86
-n Do not run the command to start the X server,
just show the command that $program would run.
The LD_PRELOAD shared object will be built,
if needed.
if needed. Also note any XDUMMY* environment
variables that need to be set.
-prconf Print, to stdout, the tweaked Xorg or XFree86
-prconf Print, to stdout, the tweaked Xorg/XFree86
config file (-config and -xf86config server
options, respectively). The Xserver is not
options, respectively.) The Xserver is not
started.
-noconf Do not tweak the Xorg or XFree86 config file
(system or server command line) at all. It is
up to you to make sure it is a working config
file (e.g. "dummy" driver, etc). Perhaps you
want to use a file based on -prconf output.
-notweak Do not tweak (modify) the Xorg/XFree86 config file
(system or server command line) at all. The -geom
and similar config file modifications are ignored.
It is up to you to make sure it is a working
config file (e.g. "dummy" driver, etc.)
Perhaps you want to use a file based on the
-prconf output.
-debug Extra debugging output.
-strace strace(1) the Xserver process (for troubleshooting).
-strace strace(1) the Xserver process (for troubleshooting.)
-ltrace ltrace(1) instead of strace (can be slow.)
-h, -help Print out this help.
Xserver-args:
Most of the Xorg and XFree86 options will work. Important ones
that may be supplied if missing:
Most of the Xorg and XFree86 options will work and are simply
passed along if you supply them. Important ones that may be
supplied if missing:
:N X Display number for server to use.
vtNN Linux virtual terminal (VT) to use (a VT is currently
still used, just not switched to and from).
still used, just not switched to and from.)
-config file Driver "dummy" tweaked config file, a
-xf86config file number of settings are tweaked besides Driver.
If -config/-xf86config is not given, the system one is used.
Any settings in the config file that are not consistent with
"dummy" mode will be overwritten (unless -noconf is used).
If -config/-xf86config is not given, the system one
(e.g. /etc/X11/xorg.conf) is used. If the system one cannot be
found, a built-in one is used. Any settings in the config file
that are not consistent with "dummy" mode will be overwritten
(unless -notweak is specified.)
If "file" is only a basename (e.g. "xorg.dummy.conf") with no /'s,
then no tweaking of it is done: the X server will look for that
basename via its normal search algorithm. If the found file does
not refer to the "dummy" driver, etc, then the X server will fail.
Notes:
@ -236,17 +282,20 @@ Notes:
well in this mode, but it is evidently not intended for end-users.
So it could be removed or broken at any time.
If the display Xserver-arg (e.g. :1) is not given, or ":" or ":9999"
is given that indicates $program should try to find a free one.
If the display Xserver-arg (e.g. :1) is not given, or ":" is given
that indicates $program should try to find a free one (based on
tcp ports.)
If the display virtual terminal, VT, (e.g. vt9) is not given that
indicates $program should try to find a free one (or guess a high one).
indicates $program should try to find a free one (or guess a high one.)
This program is not completely secure WRT files in /tmp (but it tries
to a good degree). Better is to use the -tmpdir option to supply a
to a good degree.) Better is to use the -tmpdir option to supply a
directory only writable by you. Even better is to get rid of users
on the local machine you do not trust :-)
Set XDUMMY_SET_XV=1 to turn on debugging output for this script.
END
}
@ -311,8 +360,6 @@ if [ "X$XDUMMY_SU_EXEC" = "X" -a "X$root" = "X1" -a "X`id -u`" != "X0" ]; then
dosu=""
elif [ "X$arg" = "X-prconf" ]; then
dosu=""
elif [ "X$arg" = "X--" ]; then
break
fi
done
if [ $dosu ]; then
@ -337,6 +384,7 @@ if [ "X$XDUMMY_SU_EXEC" = "X" -a "X$root" = "X1" -a "X`id -u`" != "X0" ]; then
exec su -c "$0 $*"
fi
fi
# DONE:
exit
fi
fi
@ -345,17 +393,21 @@ fi
#
disp=""
args=""
cmdline_config=""
# Process Xdummy args:
#
while [ "X$1" != "X" ]
do
if [ "X$1" = "X-config" -o "X$1" = "X-xf86config" ]; then
cmdline_config="$2"
fi
case $1 in
":"*) disp=$1
;;
"-install") install=1
"-install") install=1; runit=""
;;
"-uninstall") uninstall=1
"-uninstall") uninstall=1; runit=""
;;
"-n") runit=""
;;
@ -363,9 +415,11 @@ do
;;
"-norun") runit=""
;;
"-prconf") prconf=1
"-prconf") prconf=1; runit=""
;;
"-notweak") notweak=1
;;
"-noconf") noconf=1
"-noconf") notweak=1
;;
"-nonroot") root=""
;;
@ -378,9 +432,12 @@ do
"-uid") XDUMMY_UID="$2"; shift
export XDUMMY_UID
;;
"-geom"*) geom="$2"; shift
"-geom") geom="$2"; shift
;;
"-depth") depth="$2"; shift
"-depth") depth="$2"; args="$args -depth $2";
shift
;;
"-DEPTH") depth="$2"; shift
;;
"-tmpdir") XDUMMY_TMPDIR="$2"; shift
;;
@ -390,9 +447,11 @@ do
;;
"-strace") strace=1
;;
"-h"*) help; exit 0
"-ltrace") strace=2
;;
"-h") help; exit 0
;;
"--") shift; break
"-help") help; exit 0
;;
*) args="$args $1"
;;
@ -433,32 +492,45 @@ fi
# Function to compile the LD_PRELOAD shared object:
#
make_so() {
# extract code embedded in this script into a tmp C file:
n1=`grep -n '^#code_begin' $0 | head -1 | awk -F: '{print $1}'`
n2=`grep -n '^#code_end' $0 | head -1 | awk -F: '{print $1}'`
n1=`expr $n1 + 1`
dn=`expr $n2 - $n1`
tmp=$tdir/Xdummy.$$.c
tmp=$tdir/Xdummy.$RANDOM$$.c
rm -f $tmp
if [ -e $tmp -o -h $tmp ]; then
warn "$tmp still exists."
exit 1
fi
touch $tmp || exit 1
tail -n +$n1 $0 | head -n $dn > $tmp
# compile it to Xdummy.so:
if [ -f $SO ]; then
mv $SO $SO.$$
rm -f $SO.$$
fi
rm -f $SO
touch $SO
if [ ! -f $SO ]; then
SO=$tdir/Xdummy.$user.so
warn "warning switching LD_PRELOAD shared object to: $SO"
fi
if [ -f $SO ]; then
mv $SO $SO.$$
rm -f $SO.$$
fi
rm -f $SO
# we assume gcc:
cc -shared -fPIC -o $SO $tmp
if [ "X$INTERPOSE_GETUID" = "X1" ]; then
CFLAGS="$CFLAGS -DINTERPOSE_GETUID"
fi
echo "$program:" cc -shared -fPIC $CFLAGS -o $SO $tmp
cc -shared -fPIC $CFLAGS -o $SO $tmp
rc=$?
rm -f $tmp
if [ $rc != 0 ]; then
@ -485,6 +557,10 @@ if [ "X$install" != "X" -o "X$uninstall" != "X" ]; then
if [ -e $SO -o -h $SO ]; then
warn "$program: removing $SO"
fi
if [ -f $SO ]; then
mv $SO $SO.$$
rm -f $SO.$$
fi
rm -f $SO
if [ -e $SO -o -h $SO ]; then
warn "warning: $SO still exists."
@ -736,37 +812,12 @@ fi
# Decide flavor of Xserver:
#
stype=`basename "$xserver"`
if echo "$stype" | grep -i xorg > /dev/null; then
stype=xorg
else
if echo "$stype" | grep -i xfree86 > /dev/null; then
stype=xfree86
else
stype=xorg
fi
# Work out config file and tweak it.
#
next=""
config=""
got_config=""
for arg in $*
do
if [ $next ]; then
config="$arg"
got_config=1
break
fi
if [ "X$arg" = "X-xf86config" ]; then
if [ "X$stype" = "X" ]; then
stype="xfree86"
fi
next=1
elif [ "X$arg" = "X-config" ]; then
if [ "X$stype" = "X" ]; then
stype="xorg"
fi
next=1
fi
done
tweak_config() {
in="$1"
config2="$XDUMMY_TMPDIR/xdummy_modified_xconfig.conf"
@ -795,6 +846,10 @@ tweak_config() {
$geom = $tmp;
}
while (<>) {
if ($ENV{XDUMMY_NOTWEAK}) {
print $_;
next;
}
$n++;
if (/^\s*#/) {
# pass comments straight thru
@ -967,6 +1022,9 @@ tweak_config() {
}
print;
}
if ($ENV{XDUMMY_NOTWEAK}) {
exit;
}
# create any crucial sections that are missing:
if (! exists($sects{serverflags})) {
print "\n##Xdummy:##\n";
@ -1021,14 +1079,31 @@ tweak_config() {
';
}
if [ ! $noconf ]; then
# Work out config file and tweak it.
#
if [ "X$cmdline_config" = "X" ]; then
:
elif echo "$cmdline_config" | grep '/' > /dev/null; then
:
else
# ignore basename only case (let server handle it)
cmdline_config=""
notweak=1
fi
config=$cmdline_config
if [ "X$notweak" = "X1" -a "X$root" = "X" -a -f "$cmdline_config" ]; then
# if not root we need to copy (but not tweak) the specified config.
XDUMMY_NOTWEAK=1
export XDUMMY_NOTWEAK
notweak=""
fi
if [ ! $notweak ]; then
# tweaked config will be put in $config2:
config2=""
if [ "X$config" != "X" ]; then
if [ ! -f $config ]; then
config="/etc/X11/$config"
fi
else
if [ "X$config" = "X" ]; then
# use the default one:
if [ "X$stype" = "Xxorg" ]; then
config=/etc/X11/xorg.conf
@ -1052,6 +1127,7 @@ if [ ! $noconf ]; then
if [ ! -f $config ]; then
config="$XDUMMY_TMPDIR/xorg.conf"
warn "$program: using minimal built-in xorg.conf settings."
cat > $config <<END
Section "ServerLayout"
@ -1119,7 +1195,7 @@ END
fi
# now we need to get our tweaked config file onto the command line:
if [ ! $got_config ]; then
if [ "X$cmdline_config" = "X" ]; then
# append to cmdline (FUBAR will be substituted below.)
if [ "X$stype" = "Xxorg" ]; then
args="$args -config FUBAR"
@ -1142,7 +1218,7 @@ fi
if [ $prconf ]; then
warn ""
warn "The Xorg/XFree86 server config file is:"
warn "Printing out the Xorg/XFree86 server config file:"
warn ""
if [ "X$config2" = "X" ]; then
warn "NO CONFIG GENERATED."
@ -1195,7 +1271,11 @@ if [ "X$debug" != "X" -o "X$runit" = "X" ]; then
fi
if [ $strace ]; then
if [ "X$strace" = "X2" ]; then
ltrace -f env LD_PRELOAD=$SO $xserver $disp $args $vt
else
strace -f env LD_PRELOAD=$SO $xserver $disp $args $vt
fi
else
exec env LD_PRELOAD=$SO $xserver $disp $args $vt
fi
@ -1597,6 +1677,10 @@ int chown(const char *path, uid_t owner, gid_t group) {
return(real_chown(path, owner, group));
}
extern int *__errno_location (void);
#ifndef ENODEV
#define ENODEV 19
#endif
int ioperm(unsigned long from, unsigned long num, int turn_on) {
static int (*real_ioperm)(unsigned long, unsigned long, int) = NULL;
@ -1610,6 +1694,12 @@ int ioperm(unsigned long from, unsigned long num, int turn_on) {
if (root) {
return(real_ioperm(from, num, turn_on));
}
if (from == 0 && num == 1024 && turn_on == 1) {
/* we want xf86EnableIO to fail */
if (debug) fprintf(stderr, "IOPERM: setting ENODEV.\n");
*__errno_location() = ENODEV;
return -1;
}
return 0;
}
@ -1627,7 +1717,7 @@ int iopl(int level) {
return 0;
}
#if 0
#ifdef INTERPOSE_GETUID
/*
* we got things to work w/o pretending to be root.

5
x11vnc/x11vnc.1
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@ -2,7 +2,7 @@
.TH X11VNC "1" "December 2009" "x11vnc " "User Commands"
.SH NAME
x11vnc - allow VNC connections to real X11 displays
version: 0.9.10, lastmod: 2009-12-27
version: 0.9.10, lastmod: 2009-12-28
.SH SYNOPSIS
.B x11vnc
[OPTION]...
@ -1251,11 +1251,12 @@ As in \fB-create,\fR except Xvnc.redirect instead of Xvfb.
.IP
Sets WAIT:cmd=FINDCREATEDISPLAY-Xdummy,Xvfb
.PP
\fB-create_x\fR \fIstr\fR
\fB-create_xsrv\fR \fIstr\fR
.IP
Sets WAIT:cmd=FINDCREATEDISPLAY-<str> Can be on cmdline
after anything that sets WAIT:.. and other things
(e.g. \fB-svc,\fR \fB-xdmsvc)\fR to adjust the X server list.
Example: \fB-svc\fR ... \fB-create_xsrv\fR Xdummy,X
.PP
\fB-svc\fR
.IP

2
x11vnc/x11vnc.c
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@ -2221,7 +2221,7 @@ int main(int argc, char* argv[]) {
use_dpy = strdup("WAIT:cmd=FINDCREATEDISPLAY-Xvfb");
continue;
}
if (!strcmp(arg, "-create_x")) {
if (!strcmp(arg, "-create_xsrv")) {
CHECK_ARGC
use_dpy = (char *) malloc(strlen(argv[i+1])+100);
sprintf(use_dpy, "WAIT:cmd=FINDCREATEDISPLAY-%s", argv[++i]);

2
x11vnc/x11vnc_defs.c
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@ -47,7 +47,7 @@ int xtrap_base_event_type = 0;
int xdamage_base_event_type = 0;
/* date +'lastmod: %Y-%m-%d' */
char lastmod[] = "0.9.10 lastmod: 2009-12-27";
char lastmod[] = "0.9.10 lastmod: 2009-12-28";
/* X display info */

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