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applied Dimitris' style patch from Dec'14, with some minor modifications

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This commit is contained in:
Anselm R Garbe 2015-01-27 22:16:52 +01:00
parent 66e31556db
commit a31b919111
1 changed files with 60 additions and 52 deletions
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112
slock.c
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@ -1,4 +1,3 @@
/* See LICENSE file for license details. */ /* See LICENSE file for license details. */
#define _XOPEN_SOURCE 500 #define _XOPEN_SOURCE 500
#if HAVE_SHADOW_H #if HAVE_SHADOW_H
@ -37,20 +36,22 @@ static int nscreens;
static Bool running = True; static Bool running = True;
static void static void
die(const char *errstr, ...) { die(const char *errstr, ...)
{
va_list ap; va_list ap;
va_start(ap, errstr); va_start(ap, errstr);
vfprintf(stderr, errstr, ap); vfprintf(stderr, errstr, ap);
va_end(ap); va_end(ap);
exit(EXIT_FAILURE); exit(1);
} }
#ifdef __linux__ #ifdef __linux__
#include <fcntl.h> #include <fcntl.h>
static void static void
dontkillme(void) { dontkillme(void)
{
int fd; int fd;
fd = open("/proc/self/oom_score_adj", O_WRONLY); fd = open("/proc/self/oom_score_adj", O_WRONLY);
@ -62,8 +63,10 @@ dontkillme(void) {
#endif #endif
#ifndef HAVE_BSD_AUTH #ifndef HAVE_BSD_AUTH
/* only run as root */
static const char * static const char *
getpw(void) { /* only run as root */ getpw(void)
{
const char *rval; const char *rval;
struct passwd *pw; struct passwd *pw;
@ -73,7 +76,7 @@ getpw(void) { /* only run as root */
if (errno) if (errno)
die("slock: getpwuid: %s\n", strerror(errno)); die("slock: getpwuid: %s\n", strerror(errno));
else else
die("slock: cannot retrieve password entry (make sure to suid or sgid slock)\n"); die("slock: cannot retrieve password entry\n");
} }
rval = pw->pw_passwd; rval = pw->pw_passwd;
@ -81,15 +84,15 @@ getpw(void) { /* only run as root */
if (rval[0] == 'x' && rval[1] == '\0') { if (rval[0] == 'x' && rval[1] == '\0') {
struct spwd *sp; struct spwd *sp;
sp = getspnam(getenv("USER")); sp = getspnam(getenv("USER"));
if(!sp) if (!sp)
die("slock: cannot retrieve shadow entry (make sure to suid or sgid slock)\n"); die("slock: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
rval = sp->sp_pwdp; rval = sp->sp_pwdp;
} }
#endif #endif
/* drop privileges */ /* drop privileges */
if (geteuid() == 0 if (geteuid() == 0 &&
&& ((getegid() != pw->pw_gid && setgid(pw->pw_gid) < 0) || setuid(pw->pw_uid) < 0)) ((getegid() != pw->pw_gid && setgid(pw->pw_gid) < 0) || setuid(pw->pw_uid) < 0))
die("slock: cannot drop privileges\n"); die("slock: cannot drop privileges\n");
return rval; return rval;
} }
@ -115,21 +118,23 @@ readpw(Display *dpy, const char *pws)
* had been removed and you can set it with "xset" or some other * had been removed and you can set it with "xset" or some other
* utility. This way the user can easily set a customized DPMS * utility. This way the user can easily set a customized DPMS
* timeout. */ * timeout. */
while(running && !XNextEvent(dpy, &ev)) { while (running && !XNextEvent(dpy, &ev)) {
if(ev.type == KeyPress) { if (ev.type == KeyPress) {
buf[0] = 0; buf[0] = 0;
num = XLookupString(&ev.xkey, buf, sizeof buf, &ksym, 0); num = XLookupString(&ev.xkey, buf, sizeof buf, &ksym, 0);
if(IsKeypadKey(ksym)) { if (IsKeypadKey(ksym)) {
if(ksym == XK_KP_Enter) if (ksym == XK_KP_Enter)
ksym = XK_Return; 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; ksym = (ksym - XK_KP_0) + XK_0;
} }
if(IsFunctionKey(ksym) || IsKeypadKey(ksym) if (IsFunctionKey(ksym) ||
|| IsMiscFunctionKey(ksym) || IsPFKey(ksym) IsKeypadKey(ksym) ||
|| IsPrivateKeypadKey(ksym)) IsMiscFunctionKey(ksym) ||
IsPFKey(ksym) ||
IsPrivateKeypadKey(ksym))
continue; continue;
switch(ksym) { switch (ksym) {
case XK_Return: case XK_Return:
passwd[len] = 0; passwd[len] = 0;
#ifdef HAVE_BSD_AUTH #ifdef HAVE_BSD_AUTH
@ -137,7 +142,7 @@ readpw(Display *dpy, const char *pws)
#else #else
running = !!strcmp(crypt(passwd, pws), pws); running = !!strcmp(crypt(passwd, pws), pws);
#endif #endif
if(running) if (running)
XBell(dpy, 100); XBell(dpy, 100);
len = 0; len = 0;
break; break;
@ -145,36 +150,37 @@ readpw(Display *dpy, const char *pws)
len = 0; len = 0;
break; break;
case XK_BackSpace: case XK_BackSpace:
if(len) if (len)
--len; --len;
break; break;
default: 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); memcpy(passwd + len, buf, num);
len += num; len += num;
} }
break; break;
} }
if(llen == 0 && len != 0) { if (llen == 0 && len != 0) {
for(screen = 0; screen < nscreens; screen++) { for (screen = 0; screen < nscreens; screen++) {
XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[1]); XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[1]);
XClearWindow(dpy, locks[screen]->win); XClearWindow(dpy, locks[screen]->win);
} }
} else if(llen != 0 && len == 0) { } else if (llen != 0 && len == 0) {
for(screen = 0; screen < nscreens; screen++) { for (screen = 0; screen < nscreens; screen++) {
XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[0]); XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[0]);
XClearWindow(dpy, locks[screen]->win); XClearWindow(dpy, locks[screen]->win);
} }
} }
llen = len; llen = len;
} }
else for(screen = 0; screen < nscreens; screen++) else for (screen = 0; screen < nscreens; screen++)
XRaiseWindow(dpy, locks[screen]->win); XRaiseWindow(dpy, locks[screen]->win);
} }
} }
static void static void
unlockscreen(Display *dpy, Lock *lock) { unlockscreen(Display *dpy, Lock *lock)
{
if(dpy == NULL || lock == NULL) if(dpy == NULL || lock == NULL)
return; return;
@ -187,7 +193,8 @@ unlockscreen(Display *dpy, Lock *lock) {
} }
static Lock * static Lock *
lockscreen(Display *dpy, int screen) { lockscreen(Display *dpy, int screen)
{
char curs[] = {0, 0, 0, 0, 0, 0, 0, 0}; char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
unsigned int len; unsigned int len;
Lock *lock; Lock *lock;
@ -195,11 +202,11 @@ lockscreen(Display *dpy, int screen) {
XSetWindowAttributes wa; XSetWindowAttributes wa;
Cursor invisible; Cursor invisible;
if(dpy == NULL || screen < 0) if (dpy == NULL || screen < 0)
return NULL; return NULL;
lock = malloc(sizeof(Lock)); lock = malloc(sizeof(Lock));
if(lock == NULL) if (lock == NULL)
return NULL; return NULL;
lock->screen = screen; lock->screen = screen;
@ -210,8 +217,8 @@ lockscreen(Display *dpy, int screen) {
wa.override_redirect = 1; wa.override_redirect = 1;
wa.background_pixel = BlackPixel(dpy, lock->screen); wa.background_pixel = BlackPixel(dpy, lock->screen);
lock->win = XCreateWindow(dpy, lock->root, 0, 0, DisplayWidth(dpy, lock->screen), DisplayHeight(dpy, lock->screen), lock->win = XCreateWindow(dpy, lock->root, 0, 0, DisplayWidth(dpy, lock->screen), DisplayHeight(dpy, lock->screen),
0, DefaultDepth(dpy, lock->screen), CopyFromParent, 0, DefaultDepth(dpy, lock->screen), CopyFromParent,
DefaultVisual(dpy, lock->screen), CWOverrideRedirect | CWBackPixel, &wa); DefaultVisual(dpy, lock->screen), CWOverrideRedirect | CWBackPixel, &wa);
XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), COLOR2, &color, &dummy); XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), COLOR2, &color, &dummy);
lock->colors[1] = color.pixel; lock->colors[1] = color.pixel;
XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), COLOR1, &color, &dummy); XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), COLOR1, &color, &dummy);
@ -220,36 +227,37 @@ lockscreen(Display *dpy, int screen) {
invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap, &color, &color, 0, 0); invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap, &color, &color, 0, 0);
XDefineCursor(dpy, lock->win, invisible); XDefineCursor(dpy, lock->win, invisible);
XMapRaised(dpy, lock->win); XMapRaised(dpy, lock->win);
for(len = 1000; len; len--) { for (len = 1000; len; len--) {
if(XGrabPointer(dpy, lock->root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask, if (XGrabPointer(dpy, lock->root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess) GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess)
break; break;
usleep(1000); usleep(1000);
} }
if(running && (len > 0)) { if (running && (len > 0)) {
for(len = 1000; len; len--) { for (len = 1000; len; len--) {
if(XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime) if (XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess)
== GrabSuccess)
break; break;
usleep(1000); usleep(1000);
} }
} }
running &= (len > 0); running &= (len > 0);
if(!running) { if (!running) {
unlockscreen(dpy, lock); unlockscreen(dpy, lock);
lock = NULL; lock = NULL;
} }
else else {
XSelectInput(dpy, lock->root, SubstructureNotifyMask); XSelectInput(dpy, lock->root, SubstructureNotifyMask);
}
return lock; return lock;
} }
static void static void
usage(void) { usage(void)
{
fprintf(stderr, "usage: slock [-v]\n"); fprintf(stderr, "usage: slock [-v]\n");
exit(EXIT_FAILURE); exit(1);
} }
int int
@ -260,38 +268,38 @@ main(int argc, char **argv) {
Display *dpy; Display *dpy;
int screen; int screen;
if((argc == 2) && !strcmp("-v", argv[1])) if ((argc == 2) && !strcmp("-v", argv[1]))
die("slock-%s, © 2006-2014 slock engineers\n", VERSION); die("slock-%s, © 2006-2015 slock engineers\n", VERSION);
else if(argc != 1) else if (argc != 1)
usage(); usage();
#ifdef __linux__ #ifdef __linux__
dontkillme(); dontkillme();
#endif #endif
if(!getpwuid(getuid())) if (!getpwuid(getuid()))
die("slock: no passwd entry for you\n"); die("slock: no passwd entry for you\n");
#ifndef HAVE_BSD_AUTH #ifndef HAVE_BSD_AUTH
pws = getpw(); pws = getpw();
#endif #endif
if(!(dpy = XOpenDisplay(0))) if (!(dpy = XOpenDisplay(0)))
die("slock: cannot open display\n"); die("slock: cannot open display\n");
/* Get the number of screens in display "dpy" and blank them all. */ /* Get the number of screens in display "dpy" and blank them all. */
nscreens = ScreenCount(dpy); nscreens = ScreenCount(dpy);
locks = malloc(sizeof(Lock *) * nscreens); locks = malloc(sizeof(Lock *) * nscreens);
if(locks == NULL) if (locks == NULL)
die("slock: malloc: %s\n", strerror(errno)); die("slock: malloc: %s\n", strerror(errno));
int nlocks = 0; int nlocks = 0;
for(screen = 0; screen < nscreens; screen++) { for (screen = 0; screen < nscreens; screen++) {
if ( (locks[screen] = lockscreen(dpy, screen)) != NULL) if ( (locks[screen] = lockscreen(dpy, screen)) != NULL)
nlocks++; nlocks++;
} }
XSync(dpy, False); XSync(dpy, False);
/* Did we actually manage to lock something? */ /* Did we actually manage to lock something? */
if (nlocks == 0) { // nothing to protect if (nlocks == 0) { /* nothing to protect */
free(locks); free(locks);
XCloseDisplay(dpy); XCloseDisplay(dpy);
return 1; return 1;
@ -305,7 +313,7 @@ main(int argc, char **argv) {
#endif #endif
/* Password ok, unlock everything and quit. */ /* Password ok, unlock everything and quit. */
for(screen = 0; screen < nscreens; screen++) for (screen = 0; screen < nscreens; screen++)
unlockscreen(dpy, locks[screen]); unlockscreen(dpy, locks[screen]);
free(locks); free(locks);