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Upgraded slock to 1.5

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This commit is contained in:
_N0x 2023-09-03 19:50:01 +02:00
parent 11372abf07
commit 162de47245
12 changed files with 1184 additions and 0 deletions
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24
slock-1.5/LICENSE Normal file
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MIT/X Consortium License
© 2015-2016 Markus Teich <markus.teich@stusta.mhn.de>
© 2014 Dimitris Papastamos <sin@2f30.org>
© 2006-2014 Anselm R Garbe <anselm@garbe.us>
© 2014-2016 Laslo Hunhold <dev@frign.de>
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

61
slock-1.5/Makefile Normal file
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# slock - simple screen locker
# See LICENSE file for copyright and license details.
include config.mk
SRC = slock.c ${COMPATSRC}
OBJ = ${SRC:.c=.o}
all: options slock
options:
@echo slock build options:
@echo "CFLAGS = ${CFLAGS}"
@echo "LDFLAGS = ${LDFLAGS}"
@echo "CC = ${CC}"
.c.o:
@echo CC $<
@${CC} -c ${CFLAGS} $<
${OBJ}: config.h config.mk arg.h util.h
config.h:
@echo creating $@ from config.def.h
@cp config.def.h $@
slock: ${OBJ}
@echo CC -o $@
@${CC} -o $@ ${OBJ} ${LDFLAGS}
clean:
@echo cleaning
@rm -f slock ${OBJ} slock-${VERSION}.tar.gz
dist: clean
@echo creating dist tarball
@mkdir -p slock-${VERSION}
@cp -R LICENSE Makefile README slock.1 config.mk \
${SRC} config.def.h arg.h util.h slock-${VERSION}
@tar -cf slock-${VERSION}.tar slock-${VERSION}
@gzip slock-${VERSION}.tar
@rm -rf slock-${VERSION}
install: all
@echo installing executable file to ${DESTDIR}${PREFIX}/bin
@mkdir -p ${DESTDIR}${PREFIX}/bin
@cp -f slock ${DESTDIR}${PREFIX}/bin
@chmod 755 ${DESTDIR}${PREFIX}/bin/slock
@chmod u+s ${DESTDIR}${PREFIX}/bin/slock
@echo installing manual page to ${DESTDIR}${MANPREFIX}/man1
@mkdir -p ${DESTDIR}${MANPREFIX}/man1
@sed "s/VERSION/${VERSION}/g" <slock.1 >${DESTDIR}${MANPREFIX}/man1/slock.1
@chmod 644 ${DESTDIR}${MANPREFIX}/man1/slock.1
uninstall:
@echo removing executable file from ${DESTDIR}${PREFIX}/bin
@rm -f ${DESTDIR}${PREFIX}/bin/slock
@echo removing manual page from ${DESTDIR}${MANPREFIX}/man1
@rm -f ${DESTDIR}${MANPREFIX}/man1/slock.1
.PHONY: all options clean dist install uninstall

24
slock-1.5/README Normal file
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slock - simple screen locker
============================
simple screen locker utility for X.
Requirements
------------
In order to build slock you need the Xlib header files.
Installation
------------
Edit config.mk to match your local setup (slock is installed into
the /usr/local namespace by default).
Afterwards enter the following command to build and install slock
(if necessary as root):
make clean install
Running slock
-------------
Simply invoke the 'slock' command. To get out of it, enter your password.

65
slock-1.5/arg.h Normal file
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/*
* Copy me if you can.
* by 20h
*/
#ifndef ARG_H__
#define ARG_H__
extern char *argv0;
/* use main(int argc, char *argv[]) */
#define ARGBEGIN for (argv0 = *argv, argv++, argc--;\
argv[0] && argv[0][0] == '-'\
&& argv[0][1];\
argc--, argv++) {\
char argc_;\
char **argv_;\
int brk_;\
if (argv[0][1] == '-' && argv[0][2] == '\0') {\
argv++;\
argc--;\
break;\
}\
for (brk_ = 0, argv[0]++, argv_ = argv;\
argv[0][0] && !brk_;\
argv[0]++) {\
if (argv_ != argv)\
break;\
argc_ = argv[0][0];\
switch (argc_)
/* Handles obsolete -NUM syntax */
#define ARGNUM case '0':\
case '1':\
case '2':\
case '3':\
case '4':\
case '5':\
case '6':\
case '7':\
case '8':\
case '9'
#define ARGEND }\
}
#define ARGC() argc_
#define ARGNUMF() (brk_ = 1, estrtonum(argv[0], 0, INT_MAX))
#define EARGF(x) ((argv[0][1] == '\0' && argv[1] == NULL)?\
((x), abort(), (char *)0) :\
(brk_ = 1, (argv[0][1] != '\0')?\
(&argv[0][1]) :\
(argc--, argv++, argv[0])))
#define ARGF() ((argv[0][1] == '\0' && argv[1] == NULL)?\
(char *)0 :\
(brk_ = 1, (argv[0][1] != '\0')?\
(&argv[0][1]) :\
(argc--, argv++, argv[0])))
#define LNGARG() &argv[0][0]
#endif

24
slock-1.5/config.def.h Normal file
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/* user and group to drop privileges to */
static const char *user = "n0x";
static const char *group = "users";
static const char *colorname[NUMCOLS] = {
[INIT] = "black", /* after initialization */
[INPUT] = "#005577", /* during input */
[FAILED] = "#CC3333", /* wrong password */
};
/* treat a cleared input like a wrong password (color) */
static const int failonclear = 1;
/* time in seconds to cancel lock with mouse movement */
static const int timetocancel = 4;
/*Enable blur*/
#define BLUR
/*Set blur radius*/
static const int blurRadius=30;
/*Enable Pixelation*/
#define PIXELATION
/*Set pixelation radius*/
static const int pixelSize=10;

32
slock-1.5/config.mk Normal file
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# slock version
VERSION = 1.5
# Customize below to fit your system
# paths
PREFIX = /usr/local
MANPREFIX = ${PREFIX}/share/man
X11INC = /usr/X11R6/include
X11LIB = /usr/X11R6/lib
# includes and libs
INCS = -I. -I/usr/include -I${X11INC}
LIBS = -L/usr/lib -lc -lcrypt -L${X11LIB} -lX11 -lXext -lXrandr -lImlib2
# flags
CPPFLAGS = -DVERSION=\"${VERSION}\" -D_DEFAULT_SOURCE -DHAVE_SHADOW_H
CFLAGS = -std=c99 -pedantic -Wall -Ofast ${INCS} ${CPPFLAGS}
LDFLAGS = -s ${LIBS}
COMPATSRC = explicit_bzero.c
# On OpenBSD and Darwin remove -lcrypt from LIBS
#LIBS = -L/usr/lib -lc -L${X11LIB} -lX11 -lXext -lXrandr
# On *BSD remove -DHAVE_SHADOW_H from CPPFLAGS
# On NetBSD add -D_NETBSD_SOURCE to CPPFLAGS
#CPPFLAGS = -DVERSION=\"${VERSION}\" -D_BSD_SOURCE -D_NETBSD_SOURCE
# On OpenBSD set COMPATSRC to empty
#COMPATSRC =
# compiler and linker
CC = cc

19
slock-1.5/explicit_bzero.c Normal file
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/* $OpenBSD: explicit_bzero.c,v 1.3 2014/06/21 02:34:26 matthew Exp $ */
/*
* Public domain.
* Written by Matthew Dempsky.
*/
#include <string.h>
__attribute__((weak)) void
__explicit_bzero_hook(void *buf, size_t len)
{
}
void
explicit_bzero(void *buf, size_t len)
{
memset(buf, 0, len);
__explicit_bzero_hook(buf, len);
}

356
slock-1.5/patches/slock-blur_pixelated_screen-1.4.diff Normal file
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From 36a4863f9a399740aaf8b1e01926485c0a055e1c Mon Sep 17 00:00:00 2001
From: Lars Niesen <iah71niesen@gso-koeln.de>
Date: Wed, 29 Apr 2020 13:52:42 +0200
Subject: [PATCH 1/8] Added Bg patch and screenshot capabilities
---
config.mk | 2 +-
slock.c | 35 +++++++++++++++++++++++++++++++----
2 files changed, 32 insertions(+), 5 deletions(-)
diff --git a/config.mk b/config.mk
index 74429ae..987819e 100644
--- a/config.mk
+++ b/config.mk
@@ -12,7 +12,7 @@ X11LIB = /usr/X11R6/lib
# includes and libs
INCS = -I. -I/usr/include -I${X11INC}
-LIBS = -L/usr/lib -lc -lcrypt -L${X11LIB} -lX11 -lXext -lXrandr
+LIBS = -L/usr/lib -lc -lcrypt -L${X11LIB} -lX11 -lXext -lXrandr -lImlib2
# flags
CPPFLAGS = -DVERSION=\"${VERSION}\" -D_DEFAULT_SOURCE -DHAVE_SHADOW_H
diff --git a/slock.c b/slock.c
index 5ae738c..7c63f34 100644
--- a/slock.c
+++ b/slock.c
@@ -18,6 +18,7 @@
#include <X11/keysym.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
+#include <Imlib2.h>
#include "arg.h"
#include "util.h"
@@ -35,6 +36,7 @@ struct lock {
int screen;
Window root, win;
Pixmap pmap;
+ Pixmap bgmap;
unsigned long colors[NUMCOLS];
};
@@ -46,6 +48,8 @@ struct xrandr {
#include "config.h"
+Imlib_Image image;
+
static void
die(const char *errstr, ...)
{
@@ -190,9 +194,10 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
color = len ? INPUT : ((failure || failonclear) ? FAILED : INIT);
if (running && oldc != color) {
for (screen = 0; screen < nscreens; screen++) {
- XSetWindowBackground(dpy,
- locks[screen]->win,
- locks[screen]->colors[color]);
+ if(locks[screen]->bgmap)
+ XSetWindowBackgroundPixmap(dpy, locks[screen]->win, locks[screen]->bgmap);
+ else
+ XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[0]);
XClearWindow(dpy, locks[screen]->win);
}
oldc = color;
@@ -235,6 +240,17 @@ lockscreen(Display *dpy, struct xrandr *rr, int screen)
lock->screen = screen;
lock->root = RootWindow(dpy, lock->screen);
+ if(image)
+ {
+ lock->bgmap = XCreatePixmap(dpy, lock->root, DisplayWidth(dpy, lock->screen), DisplayHeight(dpy, lock->screen), DefaultDepth(dpy, lock->screen));
+ imlib_context_set_image(image);
+ imlib_context_set_display(dpy);
+ imlib_context_set_visual(DefaultVisual(dpy, lock->screen));
+ imlib_context_set_colormap(DefaultColormap(dpy, lock->screen));
+ imlib_context_set_drawable(lock->bgmap);
+ imlib_render_image_on_drawable(0, 0);
+ imlib_free_image();
+ }
for (i = 0; i < NUMCOLS; i++) {
XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen),
colorname[i], &color, &dummy);
@@ -251,6 +267,8 @@ lockscreen(Display *dpy, struct xrandr *rr, int screen)
CopyFromParent,
DefaultVisual(dpy, lock->screen),
CWOverrideRedirect | CWBackPixel, &wa);
+ if(lock->bgmap)
+ XSetWindowBackgroundPixmap(dpy, lock->win, lock->bgmap);
lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap,
&color, &color, 0, 0);
@@ -354,7 +372,16 @@ main(int argc, char **argv) {
die("slock: setgid: %s\n", strerror(errno));
if (setuid(duid) < 0)
die("slock: setuid: %s\n", strerror(errno));
-
+
+ /*Create screenshot Image*/
+ Screen *scr = ScreenOfDisplay(dpy, DefaultScreen(dpy));
+ image = imlib_create_image(scr->width,scr->height);
+ imlib_context_set_image(image);
+ imlib_context_set_display(dpy);
+ imlib_context_set_visual(DefaultVisual(dpy,0));
+ imlib_context_set_drawable(RootWindow(dpy,XScreenNumberOfScreen(scr)));
+ imlib_copy_drawable_to_image(0,0,0,scr->width,scr->height,0,0,1);
+
/* check for Xrandr support */
rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
--
2.27.0
From 9d89604ac52b0949d047dae2f9b78cb5085ee1a2 Mon Sep 17 00:00:00 2001
From: Lars Niesen <iah71niesen@gso-koeln.de>
Date: Wed, 29 Apr 2020 14:15:59 +0200
Subject: [PATCH 2/8] Added blur function
---
config.def.h | 3 +++
slock.c | 3 ++-
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/config.def.h b/config.def.h
index c8e52d6..fcc1b39 100644
--- a/config.def.h
+++ b/config.def.h
@@ -10,3 +10,6 @@ static const char *colorname[NUMCOLS] = {
/* treat a cleared input like a wrong password (color) */
static const int failonclear = 1;
+
+/*Set Blur radius*/
+static const int blurRadius=5;
\ No newline at end of file
diff --git a/slock.c b/slock.c
index 7c63f34..0f24cd7 100644
--- a/slock.c
+++ b/slock.c
@@ -372,7 +372,7 @@ main(int argc, char **argv) {
die("slock: setgid: %s\n", strerror(errno));
if (setuid(duid) < 0)
die("slock: setuid: %s\n", strerror(errno));
-
+
/*Create screenshot Image*/
Screen *scr = ScreenOfDisplay(dpy, DefaultScreen(dpy));
image = imlib_create_image(scr->width,scr->height);
@@ -381,6 +381,7 @@ main(int argc, char **argv) {
imlib_context_set_visual(DefaultVisual(dpy,0));
imlib_context_set_drawable(RootWindow(dpy,XScreenNumberOfScreen(scr)));
imlib_copy_drawable_to_image(0,0,0,scr->width,scr->height,0,0,1);
+ imlib_image_blur(blurRadius);
/* check for Xrandr support */
rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
--
2.27.0
From 069aabd7e30244befd4efe74c85d3468ed076c21 Mon Sep 17 00:00:00 2001
From: Lars Niesen <iah71niesen@gso-koeln.de>
Date: Wed, 29 Apr 2020 17:33:09 +0200
Subject: [PATCH 4/8] added Pixelation
---
config.def.h | 3 ++-
slock.c | 42 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 44 insertions(+), 1 deletion(-)
diff --git a/config.def.h b/config.def.h
index fcc1b39..1c1aef3 100644
--- a/config.def.h
+++ b/config.def.h
@@ -12,4 +12,5 @@ static const char *colorname[NUMCOLS] = {
static const int failonclear = 1;
/*Set Blur radius*/
-static const int blurRadius=5;
\ No newline at end of file
+static const int blurRadius=0;
+static const int pixelSize=5;
diff --git a/slock.c b/slock.c
index 0f24cd7..33ca569 100644
--- a/slock.c
+++ b/slock.c
@@ -381,7 +381,49 @@ main(int argc, char **argv) {
imlib_context_set_visual(DefaultVisual(dpy,0));
imlib_context_set_drawable(RootWindow(dpy,XScreenNumberOfScreen(scr)));
imlib_copy_drawable_to_image(0,0,0,scr->width,scr->height,0,0,1);
+
+ /*Blur function*/
imlib_image_blur(blurRadius);
+
+
+ /*Pixelation*/
+ int width = scr->width;
+ int height = scr->height;
+
+ for(int y = 0; y < height; y += pixelSize)
+ {
+ for(int x = 0; x < width; x += pixelSize)
+ {
+ int red = 0;
+ int green = 0;
+ int blue = 0;
+
+ Imlib_Color pixel;
+ Imlib_Color* pp;
+ pp = &pixel;
+ for(int j = 0; j < pixelSize && j < height; j++)
+ {
+ for(int i = 0; i < pixelSize && i < width; i++)
+ {
+ imlib_image_query_pixel(x+i,y+j,pp);
+ red += pixel.red;
+ green += pixel.green;
+ blue += pixel.blue;
+ }
+ }
+ red /= (pixelSize*pixelSize);
+ green /= (pixelSize*pixelSize);
+ blue /= (pixelSize*pixelSize);
+ printf("R/G/B: %i/%i/%i\n",red,green,blue);
+ imlib_context_set_color(red,green,blue,pixel.alpha);
+ imlib_image_fill_rectangle(x,y,pixelSize,pixelSize);
+ red = 0;
+ green = 0;
+ blue = 0;
+ }
+ }
+
+
/* check for Xrandr support */
rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
--
2.27.0
From 109bac015c1c7fbf8440fb42588fe7e0e9cb5e62 Mon Sep 17 00:00:00 2001
From: Lars Niesen <iah71niesen@gso-koeln.de>
Date: Wed, 29 Apr 2020 17:42:39 +0200
Subject: [PATCH 6/8] removed debug printf
---
slock.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/slock.c b/slock.c
index 33ca569..f54c459 100644
--- a/slock.c
+++ b/slock.c
@@ -414,7 +414,6 @@ main(int argc, char **argv) {
red /= (pixelSize*pixelSize);
green /= (pixelSize*pixelSize);
blue /= (pixelSize*pixelSize);
- printf("R/G/B: %i/%i/%i\n",red,green,blue);
imlib_context_set_color(red,green,blue,pixel.alpha);
imlib_image_fill_rectangle(x,y,pixelSize,pixelSize);
red = 0;
--
2.27.0
From a13a0f4ac86f82e4dff145b7ebd93e52d07492c9 Mon Sep 17 00:00:00 2001
From: Lars Niesen <iah71niesen@gso-koeln.de>
Date: Sun, 3 May 2020 18:03:38 +0200
Subject: [PATCH 7/8] Changed compilerflag to fast
---
config.mk | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/config.mk b/config.mk
index 987819e..d0c2f01 100644
--- a/config.mk
+++ b/config.mk
@@ -16,7 +16,7 @@ LIBS = -L/usr/lib -lc -lcrypt -L${X11LIB} -lX11 -lXext -lXrandr -lImlib2
# flags
CPPFLAGS = -DVERSION=\"${VERSION}\" -D_DEFAULT_SOURCE -DHAVE_SHADOW_H
-CFLAGS = -std=c99 -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
+CFLAGS = -std=c99 -pedantic -Wall -Ofast ${INCS} ${CPPFLAGS}
LDFLAGS = -s ${LIBS}
COMPATSRC = explicit_bzero.c
--
2.27.0
From 31a7001c4954606c066cc3df4318fafd6d216bcd Mon Sep 17 00:00:00 2001
From: Lars Niesen <iah71niesen@gso-koeln.de>
Date: Mon, 4 May 2020 10:00:40 +0200
Subject: [PATCH 8/8] Added defines for BLUR/PIXELATION to remove from code by
compilation
---
config.def.h | 11 ++++++++---
slock.c | 9 ++++++---
2 files changed, 14 insertions(+), 6 deletions(-)
diff --git a/config.def.h b/config.def.h
index 1c1aef3..5407953 100644
--- a/config.def.h
+++ b/config.def.h
@@ -11,6 +11,11 @@ static const char *colorname[NUMCOLS] = {
/* treat a cleared input like a wrong password (color) */
static const int failonclear = 1;
-/*Set Blur radius*/
-static const int blurRadius=0;
-static const int pixelSize=5;
+/*Enable blur*/
+#define BLUR
+/*Set blur radius*/
+static const int blurRadius=5;
+/*Enable Pixelation*/
+//#define PIXELATION
+/*Set pixelation radius*/
+static const int pixelSize=0;
diff --git a/slock.c b/slock.c
index f54c459..1a4d6e3 100644
--- a/slock.c
+++ b/slock.c
@@ -381,11 +381,14 @@ main(int argc, char **argv) {
imlib_context_set_visual(DefaultVisual(dpy,0));
imlib_context_set_drawable(RootWindow(dpy,XScreenNumberOfScreen(scr)));
imlib_copy_drawable_to_image(0,0,0,scr->width,scr->height,0,0,1);
-
+
+#ifdef BLUR
+
/*Blur function*/
imlib_image_blur(blurRadius);
+#endif // BLUR
-
+#ifdef PIXELATION
/*Pixelation*/
int width = scr->width;
int height = scr->height;
@@ -423,7 +426,7 @@ main(int argc, char **argv) {
}
-
+#endif
/* check for Xrandr support */
rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
--
2.27.0

66
slock-1.5/patches/slock-quickcancel-1.4.diff Normal file
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@ -0,0 +1,66 @@
From e37f8981efe54bc620cb2f2280832cdab3959a32 Mon Sep 17 00:00:00 2001
From: aleks <aleks.stier@icloud.com>
Date: Thu, 10 Oct 2019 17:35:27 +0200
Subject: [PATCH] Apply quickcancel
Cancel slock by moving the mouse within a certain time-period after
slock started. The time-period can be defined in seconds with the
setting *timetocancel* in the config.h. This is useful if you forgot to
disable `xautolock` during an activity that requires no input (e.g.
reading text, watching video).
---
config.def.h | 3 +++
slock.c | 5 +++++
2 files changed, 8 insertions(+)
diff --git a/config.def.h b/config.def.h
index 9855e21..e0bf95a 100644
--- a/config.def.h
+++ b/config.def.h
@@ -10,3 +10,6 @@ static const char *colorname[NUMCOLS] = {
/* treat a cleared input like a wrong password (color) */
static const int failonclear = 1;
+
+/* time in seconds to cancel lock with mouse movement */
+static const int timetocancel = 4;
diff --git a/slock.c b/slock.c
index d2f0886..f7462ee 100644
--- a/slock.c
+++ b/slock.c
@@ -13,6 +13,7 @@
#include <stdio.h>
#include <string.h>
#include <unistd.h>
+#include <time.h>
#include <sys/types.h>
#include <X11/extensions/Xrandr.h>
#include <X11/keysym.h>
@@ -24,6 +25,8 @@
char *argv0;
+static time_t locktime;
+
enum {
INIT,
INPUT,
@@ -141,6 +144,7 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
oldc = INIT;
while (running && !XNextEvent(dpy, &ev)) {
+ running = !((time(NULL) - locktime < timetocancel) && (ev.type == MotionNotify));
if (ev.type == KeyPress) {
explicit_bzero(&buf, sizeof(buf));
num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
@@ -268,6 +272,7 @@ lockscreen(Display *dpy, struct xrandr *rr, int screen)
XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
XSelectInput(dpy, lock->root, SubstructureNotifyMask);
+ locktime = time(NULL);
return lock;
}
--
2.23.0

39
slock-1.5/slock.1 Normal file
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@ -0,0 +1,39 @@
.Dd 2016-08-23
.Dt SLOCK 1
.Sh NAME
.Nm slock
.Nd simple X screen locker
.Sh SYNOPSIS
.Nm
.Op Fl v
.Op Ar cmd Op Ar arg ...
.Sh DESCRIPTION
.Nm
is a simple X screen locker. If provided,
.Ar cmd Op Ar arg ...
is executed after the screen has been locked.
.Sh OPTIONS
.Bl -tag -width Ds
.It Fl v
Print version information to stdout and exit.
.El
.Sh SECURITY CONSIDERATIONS
To make sure a locked screen can not be bypassed by switching VTs
or killing the X server with Ctrl+Alt+Backspace, it is recommended
to disable both in
.Xr xorg.conf 5
for maximum security:
.Bd -literal -offset left
Section "ServerFlags"
Option "DontVTSwitch" "True"
Option "DontZap" "True"
EndSection
.Ed
.Sh EXAMPLES
$
.Nm
/usr/sbin/s2ram
.Sh CUSTOMIZATION
.Nm
can be customized by creating a custom config.h from config.def.h and
(re)compiling the source code. This keeps it fast, secure and simple.

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/* See LICENSE file for license details. */
#define _XOPEN_SOURCE 500
#if HAVE_SHADOW_H
#include <shadow.h>
#endif
#include <ctype.h>
#include <errno.h>
#include <grp.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <sys/types.h>
#include <X11/extensions/Xrandr.h>
#include <X11/keysym.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <Imlib2.h>
#include "arg.h"
#include "util.h"
char *argv0;
static time_t locktime;
enum {
INIT,
INPUT,
FAILED,
NUMCOLS
};
struct lock {
int screen;
Window root, win;
Pixmap pmap;
Pixmap bgmap;
unsigned long colors[NUMCOLS];
};
struct xrandr {
int active;
int evbase;
int errbase;
};
#include "config.h"
Imlib_Image image;
static void
die(const char *errstr, ...)
{
va_list ap;
va_start(ap, errstr);
vfprintf(stderr, errstr, ap);
va_end(ap);
exit(1);
}
#ifdef __linux__
#include <fcntl.h>
#include <linux/oom.h>
static void
dontkillme(void)
{
FILE *f;
const char oomfile[] = "/proc/self/oom_score_adj";
if (!(f = fopen(oomfile, "w"))) {
if (errno == ENOENT)
return;
die("slock: fopen %s: %s\n", oomfile, strerror(errno));
}
fprintf(f, "%d", OOM_SCORE_ADJ_MIN);
if (fclose(f)) {
if (errno == EACCES)
die("slock: unable to disable OOM killer. "
"Make sure to suid or sgid slock.\n");
else
die("slock: fclose %s: %s\n", oomfile, strerror(errno));
}
}
#endif
static const char *
gethash(void)
{
const char *hash;
struct passwd *pw;
/* Check if the current user has a password entry */
errno = 0;
if (!(pw = getpwuid(getuid()))) {
if (errno)
die("slock: getpwuid: %s\n", strerror(errno));
else
die("slock: cannot retrieve password entry\n");
}
hash = pw->pw_passwd;
#if HAVE_SHADOW_H
if (!strcmp(hash, "x")) {
struct spwd *sp;
if (!(sp = getspnam(pw->pw_name)))
die("slock: getspnam: cannot retrieve shadow entry. "
"Make sure to suid or sgid slock.\n");
hash = sp->sp_pwdp;
}
#else
if (!strcmp(hash, "*")) {
#ifdef __OpenBSD__
if (!(pw = getpwuid_shadow(getuid())))
die("slock: getpwnam_shadow: cannot retrieve shadow entry. "
"Make sure to suid or sgid slock.\n");
hash = pw->pw_passwd;
#else
die("slock: getpwuid: cannot retrieve shadow entry. "
"Make sure to suid or sgid slock.\n");
#endif /* __OpenBSD__ */
}
#endif /* HAVE_SHADOW_H */
return hash;
}
static void
readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
const char *hash)
{
XRRScreenChangeNotifyEvent *rre;
char buf[32], passwd[256], *inputhash;
int num, screen, running, failure, oldc;
unsigned int len, color;
KeySym ksym;
XEvent ev;
len = 0;
running = 1;
failure = 0;
oldc = INIT;
while (running && !XNextEvent(dpy, &ev)) {
running = !((time(NULL) - locktime < timetocancel) && (ev.type == MotionNotify));
if (ev.type == KeyPress) {
explicit_bzero(&buf, sizeof(buf));
num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
if (IsKeypadKey(ksym)) {
if (ksym == XK_KP_Enter)
ksym = XK_Return;
else if (ksym >= XK_KP_0 && ksym <= XK_KP_9)
ksym = (ksym - XK_KP_0) + XK_0;
}
if (IsFunctionKey(ksym) ||
IsKeypadKey(ksym) ||
IsMiscFunctionKey(ksym) ||
IsPFKey(ksym) ||
IsPrivateKeypadKey(ksym))
continue;
switch (ksym) {
case XK_Return:
passwd[len] = '\0';
errno = 0;
if (!(inputhash = crypt(passwd, hash)))
fprintf(stderr, "slock: crypt: %s\n", strerror(errno));
else
running = !!strcmp(inputhash, hash);
if (running) {
XBell(dpy, 100);
failure = 1;
}
explicit_bzero(&passwd, sizeof(passwd));
len = 0;
break;
case XK_Escape:
explicit_bzero(&passwd, sizeof(passwd));
len = 0;
break;
case XK_BackSpace:
if (len)
passwd[--len] = '\0';
break;
default:
if (num && !iscntrl((int)buf[0]) &&
(len + num < sizeof(passwd))) {
memcpy(passwd + len, buf, num);
len += num;
}
break;
}
color = len ? INPUT : ((failure || failonclear) ? FAILED : INIT);
if (running && oldc != color) {
for (screen = 0; screen < nscreens; screen++) {
if(locks[screen]->bgmap)
XSetWindowBackgroundPixmap(dpy, locks[screen]->win, locks[screen]->bgmap);
else
XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[0]);
XClearWindow(dpy, locks[screen]->win);
}
oldc = color;
}
} else if (rr->active && ev.type == rr->evbase + RRScreenChangeNotify) {
rre = (XRRScreenChangeNotifyEvent*)&ev;
for (screen = 0; screen < nscreens; screen++) {
if (locks[screen]->win == rre->window) {
if (rre->rotation == RR_Rotate_90 ||
rre->rotation == RR_Rotate_270)
XResizeWindow(dpy, locks[screen]->win,
rre->height, rre->width);
else
XResizeWindow(dpy, locks[screen]->win,
rre->width, rre->height);
XClearWindow(dpy, locks[screen]->win);
break;
}
}
} else {
for (screen = 0; screen < nscreens; screen++)
XRaiseWindow(dpy, locks[screen]->win);
}
}
}
static struct lock *
lockscreen(Display *dpy, struct xrandr *rr, int screen)
{
char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
int i, ptgrab, kbgrab;
struct lock *lock;
XColor color, dummy;
XSetWindowAttributes wa;
Cursor invisible;
if (dpy == NULL || screen < 0 || !(lock = malloc(sizeof(struct lock))))
return NULL;
lock->screen = screen;
lock->root = RootWindow(dpy, lock->screen);
if(image)
{
lock->bgmap = XCreatePixmap(dpy, lock->root, DisplayWidth(dpy, lock->screen), DisplayHeight(dpy, lock->screen), DefaultDepth(dpy, lock->screen));
imlib_context_set_image(image);
imlib_context_set_display(dpy);
imlib_context_set_visual(DefaultVisual(dpy, lock->screen));
imlib_context_set_colormap(DefaultColormap(dpy, lock->screen));
imlib_context_set_drawable(lock->bgmap);
imlib_render_image_on_drawable(0, 0);
imlib_free_image();
}
for (i = 0; i < NUMCOLS; i++) {
XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen),
colorname[i], &color, &dummy);
lock->colors[i] = color.pixel;
}
/* init */
wa.override_redirect = 1;
wa.background_pixel = lock->colors[INIT];
lock->win = XCreateWindow(dpy, lock->root, 0, 0,
DisplayWidth(dpy, lock->screen),
DisplayHeight(dpy, lock->screen),
0, DefaultDepth(dpy, lock->screen),
CopyFromParent,
DefaultVisual(dpy, lock->screen),
CWOverrideRedirect | CWBackPixel, &wa);
if(lock->bgmap)
XSetWindowBackgroundPixmap(dpy, lock->win, lock->bgmap);
lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap,
&color, &color, 0, 0);
XDefineCursor(dpy, lock->win, invisible);
/* Try to grab mouse pointer *and* keyboard for 600ms, else fail the lock */
for (i = 0, ptgrab = kbgrab = -1; i < 6; i++) {
if (ptgrab != GrabSuccess) {
ptgrab = XGrabPointer(dpy, lock->root, False,
ButtonPressMask | ButtonReleaseMask |
PointerMotionMask, GrabModeAsync,
GrabModeAsync, None, invisible, CurrentTime);
}
if (kbgrab != GrabSuccess) {
kbgrab = XGrabKeyboard(dpy, lock->root, True,
GrabModeAsync, GrabModeAsync, CurrentTime);
}
/* input is grabbed: we can lock the screen */
if (ptgrab == GrabSuccess && kbgrab == GrabSuccess) {
XMapRaised(dpy, lock->win);
if (rr->active)
XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
XSelectInput(dpy, lock->root, SubstructureNotifyMask);
locktime = time(NULL);
return lock;
}
/* retry on AlreadyGrabbed but fail on other errors */
if ((ptgrab != AlreadyGrabbed && ptgrab != GrabSuccess) ||
(kbgrab != AlreadyGrabbed && kbgrab != GrabSuccess))
break;
usleep(100000);
}
/* we couldn't grab all input: fail out */
if (ptgrab != GrabSuccess)
fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n",
screen);
if (kbgrab != GrabSuccess)
fprintf(stderr, "slock: unable to grab keyboard for screen %d\n",
screen);
return NULL;
}
static void
usage(void)
{
die("usage: slock [-v] [cmd [arg ...]]\n");
}
int
main(int argc, char **argv) {
struct xrandr rr;
struct lock **locks;
struct passwd *pwd;
struct group *grp;
uid_t duid;
gid_t dgid;
const char *hash;
Display *dpy;
int s, nlocks, nscreens;
ARGBEGIN {
case 'v':
fprintf(stderr, "slock-"VERSION"\n");
return 0;
default:
usage();
} ARGEND
/* validate drop-user and -group */
errno = 0;
if (!(pwd = getpwnam(user)))
die("slock: getpwnam %s: %s\n", user,
errno ? strerror(errno) : "user entry not found");
duid = pwd->pw_uid;
errno = 0;
if (!(grp = getgrnam(group)))
die("slock: getgrnam %s: %s\n", group,
errno ? strerror(errno) : "group entry not found");
dgid = grp->gr_gid;
#ifdef __linux__
dontkillme();
#endif
hash = gethash();
errno = 0;
if (!crypt("", hash))
die("slock: crypt: %s\n", strerror(errno));
if (!(dpy = XOpenDisplay(NULL)))
die("slock: cannot open display\n");
/* drop privileges */
if (setgroups(0, NULL) < 0)
die("slock: setgroups: %s\n", strerror(errno));
if (setgid(dgid) < 0)
die("slock: setgid: %s\n", strerror(errno));
if (setuid(duid) < 0)
die("slock: setuid: %s\n", strerror(errno));
/*Create screenshot Image*/
Screen *scr = ScreenOfDisplay(dpy, DefaultScreen(dpy));
image = imlib_create_image(scr->width,scr->height);
imlib_context_set_image(image);
imlib_context_set_display(dpy);
imlib_context_set_visual(DefaultVisual(dpy,0));
imlib_context_set_drawable(RootWindow(dpy,XScreenNumberOfScreen(scr)));
imlib_copy_drawable_to_image(0,0,0,scr->width,scr->height,0,0,1);
#ifdef BLUR
/*Blur function*/
imlib_image_blur(blurRadius);
#endif // BLUR
#ifdef PIXELATION
/*Pixelation*/
int width = scr->width;
int height = scr->height;
for(int y = 0; y < height; y += pixelSize)
{
for(int x = 0; x < width; x += pixelSize)
{
int red = 0;
int green = 0;
int blue = 0;
Imlib_Color pixel;
Imlib_Color* pp;
pp = &pixel;
for(int j = 0; j < pixelSize && j < height; j++)
{
for(int i = 0; i < pixelSize && i < width; i++)
{
imlib_image_query_pixel(x+i,y+j,pp);
red += pixel.red;
green += pixel.green;
blue += pixel.blue;
}
}
red /= (pixelSize*pixelSize);
green /= (pixelSize*pixelSize);
blue /= (pixelSize*pixelSize);
imlib_context_set_color(red,green,blue,pixel.alpha);
imlib_image_fill_rectangle(x,y,pixelSize,pixelSize);
red = 0;
green = 0;
blue = 0;
}
}
#endif
/* check for Xrandr support */
rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
/* get number of screens in display "dpy" and blank them */
nscreens = ScreenCount(dpy);
if (!(locks = calloc(nscreens, sizeof(struct lock *))))
die("slock: out of memory\n");
for (nlocks = 0, s = 0; s < nscreens; s++) {
if ((locks[s] = lockscreen(dpy, &rr, s)) != NULL)
nlocks++;
else
break;
}
XSync(dpy, 0);
/* did we manage to lock everything? */
if (nlocks != nscreens)
return 1;
/* run post-lock command */
if (argc > 0) {
switch (fork()) {
case -1:
die("slock: fork failed: %s\n", strerror(errno));
case 0:
if (close(ConnectionNumber(dpy)) < 0)
die("slock: close: %s\n", strerror(errno));
execvp(argv[0], argv);
fprintf(stderr, "slock: execvp %s: %s\n", argv[0], strerror(errno));
_exit(1);
}
}
/* everything is now blank. Wait for the correct password */
readpw(dpy, &rr, locks, nscreens, hash);
return 0;
}

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#undef explicit_bzero
void explicit_bzero(void *, size_t);