initial commit

LICENSE

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+MIT/X Consortium License
+
+(C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
+
+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.

Makefile

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+# slock - simple screen locker
+#   (C)opyright MMVI Anselm R. Garbe
+
+include config.mk
+
+SRC = slock.c
+OBJ = ${SRC:.c=.o}
+
+all: options slock
+
+options:
+	@echo slock build options:
+	@echo "CFLAGS   = ${CFLAGS}"
+	@echo "LDFLAGS  = ${LDFLAGS}"
+	@echo "CC       = ${CC}"
+	@echo "LD       = ${LD}"
+
+.c.o:
+	@echo CC $<
+	@${CC} -c ${CFLAGS} $<
+
+${OBJ}: config.mk
+
+slock: ${OBJ}
+	@echo LD $@
+	@${LD} -o $@ ${OBJ} ${LDFLAGS}
+	@strip $@
+
+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 config.mk ${SRC} slock-${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
+
+uninstall:
+	@echo removing executable file from ${DESTDIR}${PREFIX}/bin
+	@rm -f ${DESTDIR}${PREFIX}/bin/slock
+
+.PHONY: all options clean dist install uninstall

README

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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.

config.mk

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+# slock version
+VERSION = 0.1
+
+# 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
+
+# flags
+CFLAGS = -Os ${INCS} -DVERSION=\"${VERSION}\"
+LDFLAGS = ${LIBS}
+#CFLAGS = -g -Wall -O2 ${INCS} -DVERSION=\"${VERSION}\"
+#LDFLAGS = -g ${LIBS}
+
+# compiler and linker
+CC = cc
+LD = ${CC}

slock.c

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+/* (C)opyright MMIV-MMV Anselm R. Garbe <garbeam at gmail dot com>
+ * See LICENSE file for license details.
+ */
+#define _XOPEN_SOURCE
+#include <shadow.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <X11/keysym.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+int
+main(int argc, char **argv) {
+	char buf[32], passwd[256];
+	int num, prev_nitem;
+	struct spwd *sp;
+	unsigned int i, len;
+	Bool running = True;
+	KeySym ksym;
+	Display *dpy;
+	XEvent ev;
+
+	if((argc > 1) && !strncmp(argv[1], "-v", 3)) {
+		fputs("slock-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
+		exit(EXIT_SUCCESS);
+	}
+	if(!(sp = getspnam(getenv("USER")))) {
+		fputs("slock: cannot retrieve password entry (make sure to suid slock)\n", stderr);
+		exit(EXIT_FAILURE);
+	}
+	endspent();
+	if(!(dpy = XOpenDisplay(0))) {
+		fputs("slock: cannot open display\n", stderr);
+		exit(EXIT_FAILURE);
+	}
+
+	/* init */
+	passwd[0] = 0;
+	while(XGrabKeyboard(dpy, DefaultRootWindow(dpy), True, GrabModeAsync,
+			 GrabModeAsync, CurrentTime) != GrabSuccess)
+		usleep(1000);
+
+	/* main event loop */
+	while(running && !XNextEvent(dpy, &ev))
+		if(ev.type == KeyPress) {
+			len = strlen(passwd);
+			buf[0] = 0;
+			num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
+			if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
+					|| IsMiscFunctionKey(ksym) || IsPFKey(ksym)
+					|| IsPrivateKeypadKey(ksym))
+				continue;
+			/* first check if a control mask is omitted */
+			if(ev.xkey.state & ControlMask) {
+				switch (ksym) {
+				case XK_h:
+				case XK_H: ksym = XK_BackSpace;
+					break;
+				case XK_u:
+				case XK_U: passwd[0] = 0;
+					continue;
+				}
+			}
+			switch(ksym) {
+			case XK_Return:
+				running = strncmp(crypt(passwd, sp->sp_pwdp), sp->sp_pwdp, sizeof(passwd));
+				passwd[0] = 0;
+				break;
+			case XK_Escape:
+				passwd[0] = 0;
+				break;
+			case XK_BackSpace:
+				if(len)
+					passwd[--len] = 0;
+				break;
+			default:
+				if(num && !iscntrl((int) buf[0])) {
+					buf[num] = 0;
+					if(len)
+						strncat(passwd, buf, sizeof(passwd));
+					else
+						strncpy(passwd, buf, sizeof(passwd));
+				}
+				break;
+			}
+		}
+	XCloseDisplay(dpy);
+	return 0;
+}