X-Git-Url: https://git.xinqibao.xyz/slock.git/blobdiff_plain/75dd7792456d9eb4a4c3142b81fbda5ca39a3a51..c2f975773d720e734dbdab9a1e9ae51b0972ae0c:/slock.c?ds=inline
diff --git a/slock.c b/slock.c
index 6f2e8af..dd32374 100644
--- a/slock.c
+++ b/slock.c
@@ -5,6 +5,7 @@
#endif
#include <ctype.h>
+#include <errno.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdlib.h>
@@ -12,167 +13,363 @@
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
+#include <X11/extensions/Xrandr.h>
#include <X11/keysym.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
-#include <X11/extensions/dpms.h>
#if HAVE_BSD_AUTH
#include <login_cap.h>
#include <bsd_auth.h>
#endif
+#include "arg.h"
+#include "util.h"
+
+char *argv0;
+
+enum {
+ INIT,
+ INPUT,
+ FAILED,
+ NUMCOLS
+};
+
+#include "config.h"
+
+typedef struct {
+ int screen;
+ Window root, win;
+ Pixmap pmap;
+ unsigned long colors[NUMCOLS];
+} Lock;
+
+static Lock **locks;
+static int nscreens;
+static Bool running = True;
+static Bool failure = False;
+static Bool rr;
+static int rrevbase;
+static int rrerrbase;
+
static void
-die(const char *errstr, ...) {
+die(const char *errstr, ...)
+{
va_list ap;
va_start(ap, errstr);
vfprintf(stderr, errstr, ap);
va_end(ap);
- exit(EXIT_FAILURE);
+ exit(1);
+}
+
+#ifdef __linux__
+#include <fcntl.h>
+
+static void
+dontkillme(void)
+{
+ int fd;
+
+ fd = open("/proc/self/oom_score_adj", O_WRONLY);
+ if (fd < 0 && errno == ENOENT) {
+ return;
+ }
+ if (fd < 0 || write(fd, "-1000\n", (sizeof("-1000\n") - 1)) !=
+ (sizeof("-1000\n") - 1) || close(fd) != 0) {
+ die("can't tame the oom-killer. is suid or sgid set?\n");
+ }
}
+#endif
#ifndef HAVE_BSD_AUTH
+/* only run as root */
static const char *
-get_password() { /* only run as root */
+getpw(void)
+{
const char *rval;
struct passwd *pw;
- if(geteuid() != 0)
- die("slock: cannot retrieve password entry (make sure to suid slock)\n");
- pw = getpwuid(getuid());
- endpwent();
- rval = pw->pw_passwd;
+ errno = 0;
+ if (!(pw = getpwuid(getuid()))) {
+ if (errno)
+ die("getpwuid: %s\n", strerror(errno));
+ else
+ die("cannot retrieve password entry\n");
+ }
+ rval = pw->pw_passwd;
#if HAVE_SHADOW_H
- {
+ if (rval[0] == 'x' && rval[1] == '\0') {
struct spwd *sp;
- sp = getspnam(getenv("USER"));
- endspent();
+ if (!(sp = getspnam(getenv("USER"))))
+ die("cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
rval = sp->sp_pwdp;
}
#endif
/* drop privileges */
- if(setgid(pw->pw_gid) < 0 || setuid(pw->pw_uid) < 0)
- die("slock: cannot drop privileges\n");
+ if (geteuid() == 0 &&
+ ((getegid() != pw->pw_gid && setgid(pw->pw_gid) < 0) || setuid(pw->pw_uid) < 0))
+ die("cannot drop privileges\n");
return rval;
}
#endif
-int
-main(int argc, char **argv) {
- char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
+static void
+#ifdef HAVE_BSD_AUTH
+readpw(Display *dpy)
+#else
+readpw(Display *dpy, const char *pws)
+#endif
+{
char buf[32], passwd[256];
int num, screen;
-
-#ifndef HAVE_BSD_AUTH
- const char *pws;
-#endif
- unsigned int len;
- Bool running = True;
- Cursor invisible;
- Display *dpy;
+ unsigned int len, color;
KeySym ksym;
- Pixmap pmap;
- Window root, w;
- XColor black, dummy;
XEvent ev;
- XSetWindowAttributes wa;
-
- if((argc == 2) && !strcmp("-v", argv[1]))
- die("slock-"VERSION", © 2006-2008 Anselm R Garbe\n");
- else if(argc != 1)
- die("usage: slock [-v]\n");
-
-#ifndef HAVE_BSD_AUTH
- pws = get_password();
-#endif
+ static int oldc = INIT;
- if(!(dpy = XOpenDisplay(0)))
- die("slock: cannot open display\n");
- screen = DefaultScreen(dpy);
- root = RootWindow(dpy, screen);
-
- /* init */
- wa.override_redirect = 1;
- wa.background_pixel = BlackPixel(dpy, screen);
- w = XCreateWindow(dpy, root, 0, 0, DisplayWidth(dpy, screen), DisplayHeight(dpy, screen),
- 0, DefaultDepth(dpy, screen), CopyFromParent,
- DefaultVisual(dpy, screen), CWOverrideRedirect | CWBackPixel, &wa);
- XAllocNamedColor(dpy, DefaultColormap(dpy, screen), "black", &black, &dummy);
- pmap = XCreateBitmapFromData(dpy, w, curs, 8, 8);
- invisible = XCreatePixmapCursor(dpy, pmap, pmap, &black, &black, 0, 0);
- XDefineCursor(dpy, w, invisible);
- XMapRaised(dpy, w);
- for(len = 1000; len; len--) {
- if(XGrabPointer(dpy, root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
- GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess)
- break;
- usleep(1000);
- }
- if((running = running && (len > 0))) {
- for(len = 1000; len; len--) {
- if(XGrabKeyboard(dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
- == GrabSuccess)
- break;
- usleep(1000);
- }
- running = (len > 0);
- }
len = 0;
- XSync(dpy, False);
+ running = True;
- /* main event loop */
- while(running && !XNextEvent(dpy, &ev)) {
- if(len == 0 && DPMSCapable(dpy)) {
- DPMSEnable(dpy);
- DPMSForceLevel(dpy, DPMSModeOff);
- }
- if(ev.type == KeyPress) {
- buf[0] = 0;
- num = XLookupString(&ev.xkey, buf, sizeof buf, &ksym, 0);
- if(IsKeypadKey(ksym)) {
- if(ksym == XK_KP_Enter)
+ /* As "slock" stands for "Simple X display locker", the DPMS settings
+ * had been removed and you can set it with "xset" or some other
+ * utility. This way the user can easily set a customized DPMS
+ * timeout. */
+ while (running && !XNextEvent(dpy, &ev)) {
+ 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)
+ 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))
+ if (IsFunctionKey(ksym) ||
+ IsKeypadKey(ksym) ||
+ IsMiscFunctionKey(ksym) ||
+ IsPFKey(ksym) ||
+ IsPrivateKeypadKey(ksym))
continue;
- switch(ksym) {
+ switch (ksym) {
case XK_Return:
passwd[len] = 0;
#ifdef HAVE_BSD_AUTH
running = !auth_userokay(getlogin(), NULL, "auth-xlock", passwd);
#else
- running = strcmp(crypt(passwd, pws), pws);
+ running = !!strcmp(crypt(passwd, pws), pws);
#endif
- if (running != 0)
+ if (running) {
XBell(dpy, 100);
+ failure = True;
+ }
+ explicit_bzero(&passwd, sizeof(passwd));
len = 0;
break;
case XK_Escape:
+ explicit_bzero(&passwd, sizeof(passwd));
len = 0;
break;
case XK_BackSpace:
- if(len)
- --len;
+ if (len)
+ passwd[len--] = 0;
break;
default:
- if(num && !iscntrl((int) buf[0]) && (len + num < sizeof passwd)) {
+ 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++) {
+ XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[color]);
+ XClearWindow(dpy, locks[screen]->win);
+ }
+ oldc = color;
+ }
+ } else if (rr && ev.type == rrevbase + RRScreenChangeNotify) {
+ XRRScreenChangeNotifyEvent *rre = (XRRScreenChangeNotifyEvent*)&ev;
+ for (screen = 0; screen < nscreens; screen++) {
+ if (locks[screen]->win == rre->window) {
+ XResizeWindow(dpy, locks[screen]->win, rre->width, rre->height);
+ XClearWindow(dpy, locks[screen]->win);
+ }
+ }
+ } else for (screen = 0; screen < nscreens; screen++)
+ XRaiseWindow(dpy, locks[screen]->win);
}
+}
+
+static void
+unlockscreen(Display *dpy, Lock *lock)
+{
+ if(dpy == NULL || lock == NULL)
+ return;
+
XUngrabPointer(dpy, CurrentTime);
- XFreePixmap(dpy, pmap);
- XDestroyWindow(dpy, w);
+ XFreeColors(dpy, DefaultColormap(dpy, lock->screen), lock->colors, NUMCOLS, 0);
+ XFreePixmap(dpy, lock->pmap);
+ XDestroyWindow(dpy, lock->win);
+
+ free(lock);
+}
+
+static Lock *
+lockscreen(Display *dpy, int screen)
+{
+ char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
+ int i;
+ Lock *lock;
+ XColor color, dummy;
+ XSetWindowAttributes wa;
+ Cursor invisible;
+
+ if (!running || dpy == NULL || screen < 0 || !(lock = malloc(sizeof(Lock))))
+ return NULL;
+
+ lock->screen = screen;
+ lock->root = RootWindow(dpy, lock->screen);
+
+ 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);
+ 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, else fail the lock */
+ if (XGrabPointer(dpy, lock->root, False, ButtonPressMask |
+ ButtonReleaseMask | PointerMotionMask, GrabModeAsync, GrabModeAsync,
+ None, invisible, CurrentTime) != GrabSuccess) {
+ fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n", screen);
+ running = 0;
+ unlockscreen(dpy, lock);
+ return NULL;
+ }
+
+ if (XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync,
+ CurrentTime) != GrabSuccess) {
+ fprintf(stderr, "slock: unable to grab keyboard for screen %d\n", screen);
+ running = 0;
+ unlockscreen(dpy, lock);
+ return NULL;
+ }
+
+ XMapRaised(dpy, lock->win);
+ if (rr)
+ XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
+
+ XSelectInput(dpy, lock->root, SubstructureNotifyMask);
+ return lock;
+}
+
+static void
+usage(void)
+{
+ die("usage: slock [-v | cmd [arg ...]]\n");
+}
+
+int
+main(int argc, char **argv) {
+#ifndef HAVE_BSD_AUTH
+ const char *pws;
+#endif
+ Display *dpy;
+ int s, nlocks;
+
+ ARGBEGIN {
+ case 'v':
+ fprintf(stderr, "slock-"VERSION"\n");
+ return 0;
+ default:
+ usage();
+ } ARGEND
+
+#ifdef __linux__
+ dontkillme();
+#endif
+
+ /* Check if the current user has a password entry */
+ errno = 0;
+ if (!getpwuid(getuid())) {
+ if (errno == 0)
+ die("slock: no password entry for current user\n");
+ else
+ die("slock: getpwuid: %s\n", strerror(errno));
+ }
+
+#ifndef HAVE_BSD_AUTH
+ pws = getpw();
+#endif
+
+ if (!(dpy = XOpenDisplay(NULL)))
+ die("slock: cannot open display\n");
+
+ /* check for Xrandr support */
+ rr = XRRQueryExtension(dpy, &rrevbase, &rrerrbase);
+
+ /* get number of screens in display "dpy" and blank them */
+ nscreens = ScreenCount(dpy);
+ if (!(locks = malloc(sizeof(Lock *) * nscreens))) {
+ XCloseDisplay(dpy);
+ die("slock: out of memory\n");
+ }
+ for (nlocks = 0, s = 0; s < nscreens; s++) {
+ if ((locks[s] = lockscreen(dpy, s)) != NULL)
+ nlocks++;
+ }
+ XSync(dpy, 0);
+
+ /* did we actually manage to lock anything? */
+ if (nlocks == 0) {
+ /* nothing to protect */
+ free(locks);
+ XCloseDisplay(dpy);
+ return 1;
+ }
+
+ /* run post-lock command */
+ if (argc > 0) {
+ switch (fork()) {
+ case -1:
+ free(locks);
+ XCloseDisplay(dpy);
+ 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 */
+#ifdef HAVE_BSD_AUTH
+ readpw(dpy);
+#else
+ readpw(dpy, pws);
+#endif
+
+ /* password ok, unlock everything and quit */
+ for (s = 0; s < nscreens; s++)
+ unlockscreen(dpy, locks[s]);
+
+ free(locks);
XCloseDisplay(dpy);
+
return 0;
}