X-Git-Url: https://git.danieliu.xyz/?a=blobdiff_plain;f=slock.c;h=62a9841b4b49516b89a7ca0be75c50088d818d49;hb=9698224090ff2989659717815bfa076d5d436a70;hp=b3bee92db6621586953d821d03fed574e04ca133;hpb=0edbd2e0164a8c6cbad415e38083469041f29996;p=slock.git diff --git a/slock.c b/slock.c index b3bee92..62a9841 100644 --- a/slock.c +++ b/slock.c @@ -23,6 +23,11 @@ #include #endif +#include "arg.h" +#include "util.h" + +char *argv0; + enum { INIT, INPUT, @@ -41,8 +46,6 @@ typedef struct { static Lock **locks; static int nscreens; -static Bool running = True; -static Bool failure = False; static Bool rr; static int rrevbase; static int rrerrbase; @@ -65,23 +68,23 @@ die(const char *errstr, ...) static void dontkillme(void) { - int fd; - int length; - char value[64]; - - fd = open("/proc/self/oom_score_adj", O_WRONLY); - if (fd < 0 && errno == ENOENT) - return; + FILE *f; + const char oomfile[] = "/proc/self/oom_score_adj"; - /* convert OOM_SCORE_ADJ_MIN to string for writing */ - length = snprintf(value, sizeof(value), "%d\n", OOM_SCORE_ADJ_MIN); - - /* bail on truncation */ - if (length >= sizeof(value)) - die("buffer too small\n"); - - if (fd < 0 || write(fd, value, length) != length || close(fd) != 0) - die("cannot disable the out-of-memory killer for this process\n"); + 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. " + "suid or sgid set?\n"); + else + die("slock: fclose %s: %s\n", oomfile, + strerror(errno)); + } } #endif @@ -94,20 +97,18 @@ getpw(void) struct passwd *pw; errno = 0; - pw = getpwuid(getuid()); - if (!pw) { + if (!(pw = getpwuid(getuid()))) { if (errno) die("slock: getpwuid: %s\n", strerror(errno)); else die("slock: cannot retrieve password entry\n"); } - rval = pw->pw_passwd; + rval = pw->pw_passwd; #if HAVE_SHADOW_H if (rval[0] == 'x' && rval[1] == '\0') { struct spwd *sp; - sp = getspnam(getenv("USER")); - if (!sp) + if (!(sp = getspnam(getenv("USER")))) die("slock: cannot retrieve shadow entry (make sure to suid or sgid slock)\n"); rval = sp->sp_pwdp; } @@ -128,15 +129,16 @@ readpw(Display *dpy) readpw(Display *dpy, const char *pws) #endif { - char buf[32], passwd[256]; - int num, screen; + char buf[32], passwd[256], *encrypted; + int num, screen, running, failure; unsigned int len, color; KeySym ksym; XEvent ev; static int oldc = INIT; len = 0; - running = True; + running = 1; + failure = 0; /* As "slock" stands for "Simple X display locker", the DPMS settings * had been removed and you can set it with "xset" or some other @@ -144,7 +146,7 @@ readpw(Display *dpy, const char *pws) * timeout. */ while (running && !XNextEvent(dpy, &ev)) { if (ev.type == KeyPress) { - buf[0] = 0; + explicit_bzero(&buf, sizeof(buf)); num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0); if (IsKeypadKey(ksym)) { if (ksym == XK_KP_Enter) @@ -162,32 +164,38 @@ readpw(Display *dpy, const char *pws) case XK_Return: passwd[len] = 0; #ifdef HAVE_BSD_AUTH - running = !auth_userokay(getlogin(), NULL, "auth-xlock", passwd); + running = !auth_userokay(getlogin(), NULL, "auth-slock", passwd); #else - running = !!strcmp(crypt(passwd, pws), pws); + errno = 0; + if (!(encrypted = crypt(passwd, pws))) + fprintf(stderr, "slock: crypt: %s\n", strerror(errno)); + else + running = !!strcmp(encrypted, pws); #endif 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; + 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 (oldc != color) { + if (running && oldc != color) { for (screen = 0; screen < nscreens; screen++) { XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[color]); XClearWindow(dpy, locks[screen]->win); @@ -214,6 +222,7 @@ unlockscreen(Display *dpy, Lock *lock) return; XUngrabPointer(dpy, CurrentTime); + XUngrabKeyboard(dpy, CurrentTime); XFreeColors(dpy, DefaultColormap(dpy, lock->screen), lock->colors, NUMCOLS, 0); XFreePixmap(dpy, lock->pmap); XDestroyWindow(dpy, lock->win); @@ -221,26 +230,32 @@ unlockscreen(Display *dpy, Lock *lock) free(lock); } +static void +cleanup(Display *dpy) +{ + int s; + + for (s = 0; s < nscreens; ++s) + unlockscreen(dpy, locks[s]); + + free(locks); + XCloseDisplay(dpy); +} + static Lock * lockscreen(Display *dpy, int screen) { char curs[] = {0, 0, 0, 0, 0, 0, 0, 0}; - unsigned int len; - int i; + int i, ptgrab, kbgrab; Lock *lock; XColor color, dummy; XSetWindowAttributes wa; Cursor invisible; - if (dpy == NULL || screen < 0) - return NULL; - - lock = malloc(sizeof(Lock)); - if (lock == NULL) + if (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++) { @@ -257,40 +272,50 @@ lockscreen(Display *dpy, int screen) 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); - XMapRaised(dpy, lock->win); - if (rr) - XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask); - for (len = 1000; len; len--) { - if (XGrabPointer(dpy, lock->root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask, - GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess) - break; - usleep(1000); - } - if (running && (len > 0)) { - for (len = 1000; len; len--) { - if (XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess) - break; - usleep(1000); + + /* 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); } - } - running &= (len > 0); - if (!running) { - unlockscreen(dpy, lock); - lock = NULL; - } - else { - XSelectInput(dpy, lock->root, SubstructureNotifyMask); + /* input is grabbed: we can lock the screen */ + if (ptgrab == GrabSuccess && kbgrab == GrabSuccess) { + XMapRaised(dpy, lock->win); + if (rr) + XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask); + + XSelectInput(dpy, lock->root, SubstructureNotifyMask); + return lock; + } + + /* retry on AlreadyGrabbed but fail on other errors */ + if ((ptgrab != AlreadyGrabbed && ptgrab != GrabSuccess) || + (kbgrab != AlreadyGrabbed && kbgrab != GrabSuccess)) + break; + + usleep(100000); } - return lock; + /* 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) { - fprintf(stderr, "usage: slock [-v]\n"); - exit(1); + die("usage: slock [-v] [cmd [arg ...]]\n"); } int @@ -299,59 +324,86 @@ main(int argc, char **argv) { const char *pws; #endif Display *dpy; - int screen; + int s, nlocks; - if ((argc == 2) && !strcmp("-v", argv[1])) - die("slock-%s, © 2006-2015 slock engineers\n", VERSION); - else if (argc != 1) + ARGBEGIN { + case 'v': + fprintf(stderr, "slock-"VERSION"\n"); + return 0; + default: usage(); + } ARGEND #ifdef __linux__ dontkillme(); #endif - if (!getpwuid(getuid())) - die("slock: no passwd entry for you\n"); + /* 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(); + if (strlen(pws) < 2) + die("slock: failed to get user password hash.\n"); #endif - if (!(dpy = XOpenDisplay(0))) + if (!(dpy = XOpenDisplay(NULL))) die("slock: cannot open display\n"); + + /* check for Xrandr support */ rr = XRRQueryExtension(dpy, &rrevbase, &rrerrbase); - /* Get the number of screens in display "dpy" and blank them all. */ + + /* get number of screens in display "dpy" and blank them */ nscreens = ScreenCount(dpy); - locks = malloc(sizeof(Lock *) * nscreens); - if (locks == NULL) - die("slock: malloc: %s\n", strerror(errno)); - int nlocks = 0; - for (screen = 0; screen < nscreens; screen++) { - if ( (locks[screen] = lockscreen(dpy, screen)) != NULL) + if (!(locks = calloc(nscreens, sizeof(Lock *)))) { + XCloseDisplay(dpy); + die("slock: out of memory\n"); + } + for (nlocks = 0, s = 0; s < nscreens; s++) { + if ((locks[s] = lockscreen(dpy, s)) != NULL) nlocks++; + else + break; } - XSync(dpy, False); + XSync(dpy, 0); - /* Did we actually manage to lock something? */ - if (nlocks == 0) { /* nothing to protect */ - free(locks); - XCloseDisplay(dpy); + /* did we manage to lock everything? */ + if (nlocks != nscreens) { + cleanup(dpy); return 1; } - /* Everything is now blank. Now wait for the correct password. */ + /* run post-lock command */ + if (argc > 0) { + switch (fork()) { + case -1: + cleanup(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 (screen = 0; screen < nscreens; screen++) - unlockscreen(dpy, locks[screen]); - - free(locks); - XCloseDisplay(dpy); + /* password ok, unlock everything and quit */ + cleanup(dpy); return 0; }