5 files changed, 214 insertions, 0 deletions

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..aa0a3ab
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+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.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..a84e889
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,52 @@
+# 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
diff --git a/README b/README
new file mode 100644
index 0000000..fc24b27
--- /dev/null
+++ b/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.
diff --git a/config.mk b/config.mk
new file mode 100644
index 0000000..48eef1f
--- /dev/null
+++ b/config.mk
@@ -0,0 +1,25 @@
+# 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}
diff --git a/slock.c b/slock.c
new file mode 100644
index 0000000..824baa2
--- /dev/null
+++ b/slock.c
@@ -0,0 +1,92 @@
+/* (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;
+}