diff options
Diffstat (limited to 'slock')
| -rwxr-xr-x | slock/LICENSE | 25 | ||||
| -rwxr-xr-x | slock/Makefile | 46 | ||||
| -rwxr-xr-x | slock/README | 24 | ||||
| -rwxr-xr-x | slock/arg.h | 65 | ||||
| -rwxr-xr-x | slock/config.def.h | 37 | ||||
| -rwxr-xr-x | slock/config.h | 37 | ||||
| -rwxr-xr-x | slock/config.mk | 37 | ||||
| -rwxr-xr-x | slock/explicit_bzero.c | 19 | ||||
| -rwxr-xr-x | slock/slock.1 | 45 | ||||
| -rwxr-xr-x | slock/slock.c | 512 | ||||
| -rwxr-xr-x | slock/util.h | 2 |
11 files changed, 849 insertions, 0 deletions
diff --git a/slock/LICENSE b/slock/LICENSE new file mode 100755 index 0000000..cb52dba --- /dev/null +++ b/slock/LICENSE @@ -0,0 +1,25 @@ +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> +© 2016-2023 Hiltjo Posthuma <hiltjo@codemadness.org> + +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. diff --git a/slock/Makefile b/slock/Makefile new file mode 100755 index 0000000..6d74b21 --- /dev/null +++ b/slock/Makefile @@ -0,0 +1,46 @@ +# slock - simple screen locker +# See LICENSE file for copyright and license details. + +include config.mk + +SRC = slock.c ${COMPATSRC} +OBJ = ${SRC:.c=.o} + +all: slock + +.c.o: + ${CC} -c ${CFLAGS} $< + +${OBJ}: config.h config.mk arg.h util.h + +config.h: + cp config.def.h $@ + +slock: ${OBJ} + ${CC} -o $@ ${OBJ} ${LDFLAGS} + +clean: + rm -f slock ${OBJ} slock-${VERSION}.tar.gz + +dist: clean + 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 + mkdir -p ${DESTDIR}${PREFIX}/bin + cp -f slock ${DESTDIR}${PREFIX}/bin + chmod 755 ${DESTDIR}${PREFIX}/bin/slock + chmod u+s ${DESTDIR}${PREFIX}/bin/slock + 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: + rm -f ${DESTDIR}${PREFIX}/bin/slock + rm -f ${DESTDIR}${MANPREFIX}/man1/slock.1 + +.PHONY: all clean dist install uninstall diff --git a/slock/README b/slock/README new file mode 100755 index 0000000..dcacd01 --- /dev/null +++ b/slock/README @@ -0,0 +1,24 @@ +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. diff --git a/slock/arg.h b/slock/arg.h new file mode 100755 index 0000000..0b23c53 --- /dev/null +++ b/slock/arg.h @@ -0,0 +1,65 @@ +/* + * 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 diff --git a/slock/config.def.h b/slock/config.def.h new file mode 100755 index 0000000..6b2f461 --- /dev/null +++ b/slock/config.def.h @@ -0,0 +1,37 @@ +/* user and group to drop privileges to */ +static const char *user = "nobody"; +static const char *group = "nogroup"; + +static const char *colorname[NUMCOLS] = { + [INIT] = "black", /* after initialization */ + [INPUT] = "#005577", /* during input */ + [FAILED] = "#CC3333", /* wrong password */ + [CAPS] = "red", /* CapsLock on */ +}; + +/* treat a cleared input like a wrong password (color) */ +static const int failonclear = 1; + +/* time to cancel lock with mouse movement in seconds */ +static const int timetocancel = 3; + +/* insert grid pattern with scale 1:1, the size can be changed with logosize */ +static const int logosize = 75; +/* grid width and height for right center alignment */ +static const int logow = 12; +static const int logoh = 6; + +static XRectangle rectangles[9] = { + /* x y w h */ + {0, 3, 1, 3}, {1, 3, 2, 1}, {0, 5, 8, 1}, {3, 0, 1, 5}, {5, 3, 1, 2}, + {7, 3, 1, 2}, {8, 3, 4, 1}, {9, 4, 1, 2}, {11, 4, 1, 2}, +}; + +/*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/config.h b/slock/config.h new file mode 100755 index 0000000..b347559 --- /dev/null +++ b/slock/config.h @@ -0,0 +1,37 @@ +/* user and group to drop privileges to */ +static const char *user = "nobody"; +static const char *group = "nogroup"; + +static const char *colorname[NUMCOLS] = { + [INIT] = "black", /* after initialization */ + [INPUT] = "#005577", /* during input */ + [FAILED] = "#CC3333", /* wrong password */ + [CAPS] = "orange", /* CapsLock on */ +}; + +/* treat a cleared input like a wrong password (color) */ +static const int failonclear = 1; + +/* time to cancel lock with mouse movement in seconds */ +static const int timetocancel = 3; + +/* insert grid pattern with scale 1:1, the size can be changed with logosize */ +static const int logosize = 75; +/* grid width and height for right center alignment */ +static const int logow = 12; +static const int logoh = 6; + +static XRectangle rectangles[9] = { + /* x y w h */ + {0, 3, 1, 3}, {1, 3, 2, 1}, {0, 5, 8, 1}, {3, 0, 1, 5}, {5, 3, 1, 2}, + {7, 3, 1, 2}, {8, 3, 4, 1}, {9, 4, 1, 2}, {11, 4, 1, 2}, +}; + +/*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/config.mk b/slock/config.mk new file mode 100755 index 0000000..587adb4 --- /dev/null +++ b/slock/config.mk @@ -0,0 +1,37 @@ +# slock version +VERSION = 1.5 + +# Customize below to fit your system + +# paths +PREFIX = /usr/local +MANPREFIX = ${PREFIX}/share/man + +X11INC = /usr/X11R6/include +X11LIB = /usr/X11R6/lib + +# Xinerama +XINERAMALIBS = -lXinerama +XINERAMAFLAGS = -DXINERAMA + +# freetype +FREETYPELIBS = -lXft +FREETYPEINC = /usr/include/freetype2 + +# includes and libs +INCS = -I. -I/usr/include -I${X11INC} -I${FREETYPEINC} +LIBS = -L/usr/lib -lc -lcrypt -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS} -lXext -lXrandr -lImlib2 + +# flags +CPPFLAGS = -DVERSION=\"${VERSION}\" -D_DEFAULT_SOURCE -DHAVE_SHADOW_H ${XINERAMAFLAGS} +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 = diff --git a/slock/explicit_bzero.c b/slock/explicit_bzero.c new file mode 100755 index 0000000..3e33ca8 --- /dev/null +++ b/slock/explicit_bzero.c @@ -0,0 +1,19 @@ +/* $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); +} diff --git a/slock/slock.1 b/slock/slock.1 new file mode 100755 index 0000000..40c15e1 --- /dev/null +++ b/slock/slock.1 @@ -0,0 +1,45 @@ +.Dd October 6, 2023 +.Dt SLOCK 1 +.Os +.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 +is executed after the screen has been locked. +.Pp +The options are as follows: +.Bl -tag -width Ds +.It Fl v +Print version information to stdout and exit. +.El +.Sh EXIT STATUS +.Ex -std +.Sh EXAMPLES +$ +.Nm +/usr/sbin/s2ram +.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 +Section "ServerFlags" + Option "DontVTSwitch" "True" + Option "DontZap" "True" +EndSection +.Ed +.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. diff --git a/slock/slock.c b/slock/slock.c new file mode 100755 index 0000000..4efd4a2 --- /dev/null +++ b/slock/slock.c @@ -0,0 +1,512 @@ +/* See LICENSE file for license details. */ +#define _XOPEN_SOURCE 500 +#define LENGTH(X) (sizeof X / sizeof X[0]) +#if HAVE_SHADOW_H +#include <shadow.h> +#endif + +#include <X11/extensions/Xrandr.h> +#include <ctype.h> +#include <errno.h> +#include <grp.h> +#include <pwd.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/types.h> +#include <time.h> +#include <unistd.h> +#ifdef XINERAMA +#include <X11/extensions/Xinerama.h> +#endif +#include <Imlib2.h> +#include <X11/XKBlib.h> +#include <X11/Xft/Xft.h> +#include <X11/Xlib.h> +#include <X11/Xutil.h> +#include <X11/keysym.h> + +#include "arg.h" +#include "util.h" + +char *argv0; + +enum { INIT, INPUT, FAILED, CAPS, NUMCOLS }; + +#include "config.h" + +struct lock { + int screen; + Window root, win; + Pixmap pmap; + Pixmap bgmap; + unsigned long colors[NUMCOLS]; + unsigned int x, y; + unsigned int xoff, yoff, mw, mh; + Drawable drawable; + GC gc; + XRectangle rectangles[LENGTH(rectangles)]; +}; + +struct xrandr { + int active; + int evbase; + int errbase; +}; + +Imlib_Image image; + +static time_t tim; + +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 resizerectangles(struct lock *lock) { + int i; + + for (i = 0; i < LENGTH(rectangles); i++) { + lock->rectangles[i].x = (rectangles[i].x * logosize) + lock->xoff + + ((lock->mw) / 2) - (logow / 2 * logosize); + lock->rectangles[i].y = (rectangles[i].y * logosize) + lock->yoff + + ((lock->mh) / 2) - (logoh / 2 * logosize); + lock->rectangles[i].width = rectangles[i].width * logosize; + lock->rectangles[i].height = rectangles[i].height * logosize; + } +} + +static void drawlogo(Display *dpy, struct lock *lock, int color) { + /* + XSetForeground(dpy, lock->gc, lock->colors[BACKGROUND]); + XFillRectangle(dpy, lock->drawable, lock->gc, 0, 0, lock->x, lock->y); */ + lock->drawable = lock->bgmap; + XSetForeground(dpy, lock->gc, lock->colors[color]); + XFillRectangles(dpy, lock->drawable, lock->gc, lock->rectangles, + LENGTH(rectangles)); + XCopyArea(dpy, lock->drawable, lock->win, lock->gc, 0, 0, lock->x, lock->y, 0, + 0); + XSync(dpy, False); +} + +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 caps, num, screen, running, failure, oldc; + unsigned int len, color, indicators; + KeySym ksym; + XEvent ev; + + len = 0; + caps = 0; + running = 1; + failure = 0; + oldc = INIT; + + if (!XkbGetIndicatorState(dpy, XkbUseCoreKbd, &indicators)) + caps = indicators & 1; + + while (running && !XNextEvent(dpy, &ev)) { + running = !((time(NULL) - tim < 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; + case XK_Caps_Lock: + caps = !caps; + break; + default: + if (num && !iscntrl((int)buf[0]) && (len + num < sizeof(passwd))) { + memcpy(passwd + len, buf, num); + len += num; + } + break; + } + color = len ? (caps ? CAPS : INPUT) + : (failure || failonclear ? FAILED : INIT); + if (running && oldc != color) { + for (screen = 0; screen < nscreens; screen++) { + drawlogo(dpy, locks[screen], color); + } + 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; +#ifdef XINERAMA + XineramaScreenInfo *info; + int n; +#endif + + 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; + } + + lock->x = DisplayWidth(dpy, lock->screen); + lock->y = DisplayHeight(dpy, lock->screen); +#ifdef XINERAMA + if ((info = XineramaQueryScreens(dpy, &n))) { + lock->xoff = info[0].x_org; + lock->yoff = info[0].y_org; + lock->mw = info[0].width; + lock->mh = info[0].height; + } else +#endif + { + lock->xoff = lock->yoff = 0; + lock->mw = lock->x; + lock->mh = lock->y; + } + lock->drawable = XCreatePixmap(dpy, lock->root, lock->x, lock->y, + DefaultDepth(dpy, screen)); + lock->gc = XCreateGC(dpy, lock->root, 0, NULL); + XSetLineAttributes(dpy, lock->gc, 1, LineSolid, CapButt, JoinMiter); + + /* init */ + wa.override_redirect = 1; + lock->win = XCreateWindow(dpy, lock->root, 0, 0, lock->x, lock->y, 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); + + resizerectangles(lock); + + /* 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); + drawlogo(dpy, lock, INIT); + tim = 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': + puts("slock-" VERSION); + 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); + + for (nlocks = 0, s = 0; s < nscreens; s++) { + XFreePixmap(dpy, locks[s]->drawable); + XFreeGC(dpy, locks[s]->gc); + } + + XSync(dpy, 0); + XCloseDisplay(dpy); + return 0; +} diff --git a/slock/util.h b/slock/util.h new file mode 100755 index 0000000..6f748b8 --- /dev/null +++ b/slock/util.h @@ -0,0 +1,2 @@ +#undef explicit_bzero +void explicit_bzero(void *, size_t); |