635 lines
16 KiB
C
635 lines
16 KiB
C
/* See LICENSE file for license details. */
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#define _XOPEN_SOURCE 500
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#if HAVE_SHADOW_H
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#include <shadow.h>
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#endif
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#include <ctype.h>
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#include <errno.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <X11/extensions/Xrandr.h>
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#include <X11/extensions/Xinerama.h>
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#include <X11/keysym.h>
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#include <security/pam_appl.h>
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#include <security/pam_misc.h>
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#include <Imlib2.h>
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#include "arg.h"
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#include "util.h"
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char *argv0;
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static int pam_conv(int num_msg, const struct pam_message **msg, struct pam_response **resp, void *appdata_ptr);
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struct pam_conv pamc = {pam_conv, NULL};
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char passwd[256];
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/* global count to prevent repeated error messages */
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int count_error = 0;
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enum {
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INIT,
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INPUT,
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FAILED,
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PAM,
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NUMCOLS
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};
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struct lock {
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int screen;
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Window root, win;
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Pixmap pmap;
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Pixmap bgmap;
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unsigned long colors[NUMCOLS];
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};
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struct xrandr {
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int active;
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int evbase;
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int errbase;
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};
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#include "config.h"
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Imlib_Image image;
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static void
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die(const char *errstr, ...)
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{
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va_list ap;
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va_start(ap, errstr);
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vfprintf(stderr, errstr, ap);
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va_end(ap);
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exit(1);
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}
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static int
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pam_conv(int num_msg, const struct pam_message **msg,
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struct pam_response **resp, void *appdata_ptr)
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{
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int retval = PAM_CONV_ERR;
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for(int i=0; i<num_msg; i++) {
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if (msg[i]->msg_style == PAM_PROMPT_ECHO_OFF &&
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strncmp(msg[i]->msg, "Password: ", 10) == 0) {
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struct pam_response *resp_msg = malloc(sizeof(struct pam_response));
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if (!resp_msg)
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die("malloc failed\n");
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char *password = malloc(strlen(passwd) + 1);
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if (!password)
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die("malloc failed\n");
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memset(password, 0, strlen(passwd) + 1);
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strcpy(password, passwd);
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resp_msg->resp_retcode = 0;
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resp_msg->resp = password;
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resp[i] = resp_msg;
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retval = PAM_SUCCESS;
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}
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}
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return retval;
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}
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#ifdef __linux__
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#include <fcntl.h>
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#include <linux/oom.h>
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static void
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dontkillme(void)
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{
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FILE *f;
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const char oomfile[] = "/proc/self/oom_score_adj";
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if (!(f = fopen(oomfile, "w"))) {
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if (errno == ENOENT)
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return;
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die("slock: fopen %s: %s\n", oomfile, strerror(errno));
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}
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fprintf(f, "%d", OOM_SCORE_ADJ_MIN);
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if (fclose(f)) {
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if (errno == EACCES)
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die("slock: unable to disable OOM killer. "
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"Make sure to suid or sgid slock.\n");
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else
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die("slock: fclose %s: %s\n", oomfile, strerror(errno));
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}
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}
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#endif
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static int
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readescapedint(const char *str, int *i) {
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int n = 0;
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if (str[*i])
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++*i;
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while(str[*i] && str[*i] != ';' && str[*i] != 'm') {
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n = 10 * n + str[*i] - '0';
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++*i;
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}
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return n;
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}
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static void
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writemessage(Display *dpy, Window win, int screen)
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{
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int len, line_len, width, height, s_width, s_height, i, k, tab_size, r, g, b, escaped_int, curr_line_len;
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XGCValues gr_values;
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XFontStruct *fontinfo;
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XColor color, dummy;
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XineramaScreenInfo *xsi;
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GC gc;
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fontinfo = XLoadQueryFont(dpy, font_name);
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if (fontinfo == NULL) {
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if (count_error == 0) {
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fprintf(stderr, "slock: Unable to load font \"%s\"\n", font_name);
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fprintf(stderr, "slock: Try listing fonts with 'slock -f'\n");
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count_error++;
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}
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return;
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}
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tab_size = 8 * XTextWidth(fontinfo, " ", 1);
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XAllocNamedColor(dpy, DefaultColormap(dpy, screen),
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text_color, &color, &dummy);
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gr_values.font = fontinfo->fid;
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gr_values.foreground = color.pixel;
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gc=XCreateGC(dpy,win,GCFont+GCForeground, &gr_values);
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/* To prevent "Uninitialized" warnings. */
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xsi = NULL;
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/*
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* Start formatting and drawing text
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*/
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len = strlen(message);
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/* Max max line length (cut at '\n') */
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line_len = curr_line_len = 0;
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k = 0;
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for (i = 0; i < len; i++) {
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if (message[i] == '\n') {
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curr_line_len = 0;
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k++;
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} else if (message[i] == 0x1b) {
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while (i < len && message[i] != 'm') {
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i++;
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}
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if (i == len)
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die("slock: unclosed escape sequence\n");
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} else {
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curr_line_len += XTextWidth(fontinfo, message + i, 1);
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if (curr_line_len > line_len)
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line_len = curr_line_len;
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}
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}
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/* If there is only one line */
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if (line_len == 0)
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line_len = len;
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if (XineramaIsActive(dpy)) {
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xsi = XineramaQueryScreens(dpy, &i);
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s_width = xsi[0].width;
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s_height = xsi[0].height;
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} else {
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s_width = DisplayWidth(dpy, screen);
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s_height = DisplayHeight(dpy, screen);
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}
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height = s_height*3/7 - (k*20)/3;
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width = (s_width - line_len)/2;
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line_len = 0;
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/* print the text while parsing 24 bit color ANSI escape codes*/
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for (i = k = 0; i < len; i++) {
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switch (message[i]) {
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case '\n':
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line_len = 0;
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while (message[i + 1] == '\t') {
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line_len += tab_size;
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i++;
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}
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k++;
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break;
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case 0x1b:
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i++;
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if (message[i] == '[') {
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escaped_int = readescapedint(message, &i);
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if (escaped_int == 39)
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continue;
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if (escaped_int != 38)
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die("slock: unknown escape sequence%d\n", escaped_int);
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if (readescapedint(message, &i) != 2)
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die("slock: only 24 bit color supported\n");
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r = readescapedint(message, &i) & 0xff;
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g = readescapedint(message, &i) & 0xff;
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b = readescapedint(message, &i) & 0xff;
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XSetForeground(dpy, gc, r << 16 | g << 8 | b);
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} else
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die("slock: unknown escape sequence\n");
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break;
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default:
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XDrawString(dpy, win, gc, width + line_len, height + 20 * k, message + i, 1);
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line_len += XTextWidth(fontinfo, message + i, 1);
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}
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}
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/* xsi should not be NULL anyway if Xinerama is active, but to be safe */
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if (XineramaIsActive(dpy) && xsi != NULL)
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XFree(xsi);
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}
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static const char *
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gethash(void)
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{
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const char *hash;
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struct passwd *pw;
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/* Check if the current user has a password entry */
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errno = 0;
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if (!(pw = getpwuid(getuid()))) {
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if (errno)
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die("slock: getpwuid: %s\n", strerror(errno));
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else
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die("slock: cannot retrieve password entry\n");
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}
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hash = pw->pw_passwd;
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#if HAVE_SHADOW_H
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if (!strcmp(hash, "x")) {
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struct spwd *sp;
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if (!(sp = getspnam(pw->pw_name)))
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die("slock: getspnam: cannot retrieve shadow entry. "
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"Make sure to suid or sgid slock.\n");
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hash = sp->sp_pwdp;
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}
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#else
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if (!strcmp(hash, "*")) {
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#ifdef __OpenBSD__
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if (!(pw = getpwuid_shadow(getuid())))
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die("slock: getpwnam_shadow: cannot retrieve shadow entry. "
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"Make sure to suid or sgid slock.\n");
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hash = pw->pw_passwd;
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#else
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die("slock: getpwuid: cannot retrieve shadow entry. "
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"Make sure to suid or sgid slock.\n");
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#endif /* __OpenBSD__ */
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}
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#endif /* HAVE_SHADOW_H */
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/* pam, store user name */
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hash = pw->pw_name;
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return hash;
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}
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static void
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readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
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const char *hash)
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{
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XRRScreenChangeNotifyEvent *rre;
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char buf[32];
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int num, screen, running, failure, oldc, retval;
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unsigned int len, color;
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KeySym ksym;
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XEvent ev;
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pam_handle_t *pamh;
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len = 0;
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running = 1;
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failure = 0;
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oldc = INIT;
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while (running && !XNextEvent(dpy, &ev)) {
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if (ev.type == KeyPress) {
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explicit_bzero(&buf, sizeof(buf));
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num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
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if (IsKeypadKey(ksym)) {
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if (ksym == XK_KP_Enter)
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ksym = XK_Return;
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else if (ksym >= XK_KP_0 && ksym <= XK_KP_9)
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ksym = (ksym - XK_KP_0) + XK_0;
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}
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if (IsFunctionKey(ksym) ||
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IsKeypadKey(ksym) ||
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IsMiscFunctionKey(ksym) ||
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IsPFKey(ksym) ||
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IsPrivateKeypadKey(ksym))
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continue;
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switch (ksym) {
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case XK_Return:
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passwd[len] = '\0';
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errno = 0;
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retval = pam_start(pam_service, hash, &pamc, &pamh);
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color = PAM;
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for (screen = 0; screen < nscreens; screen++) {
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XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[color]);
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XClearWindow(dpy, locks[screen]->win);
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XRaiseWindow(dpy, locks[screen]->win);
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}
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XSync(dpy, False);
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if (retval == PAM_SUCCESS)
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retval = pam_authenticate(pamh, 0);
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if (retval == PAM_SUCCESS)
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retval = pam_acct_mgmt(pamh, 0);
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running = 1;
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if (retval == PAM_SUCCESS)
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running = 0;
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else
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fprintf(stderr, "slock: %s\n", pam_strerror(pamh, retval));
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pam_end(pamh, retval);
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if (running) {
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XBell(dpy, 100);
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failure = 1;
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}
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explicit_bzero(&passwd, sizeof(passwd));
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len = 0;
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break;
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case XK_Escape:
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explicit_bzero(&passwd, sizeof(passwd));
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len = 0;
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break;
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case XK_BackSpace:
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if (len)
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passwd[--len] = '\0';
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break;
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default:
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if (num && !iscntrl((int)buf[0]) &&
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(len + num < sizeof(passwd))) {
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memcpy(passwd + len, buf, num);
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len += num;
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}
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break;
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}
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color = len ? INPUT : ((failure || failonclear) ? FAILED : INIT);
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if (running && oldc != color) {
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for (screen = 0; screen < nscreens; screen++) {
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if (locks[screen]->bgmap)
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XSetWindowBackgroundPixmap(dpy, locks[screen]->win, locks[screen]->bgmap);
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else
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XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[0]);
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XClearWindow(dpy, locks[screen]->win);
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writemessage(dpy, locks[screen]->win, screen);
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}
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oldc = color;
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}
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} else if (rr->active && ev.type == rr->evbase + RRScreenChangeNotify) {
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rre = (XRRScreenChangeNotifyEvent*)&ev;
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for (screen = 0; screen < nscreens; screen++) {
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if (locks[screen]->win == rre->window) {
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if (rre->rotation == RR_Rotate_90 ||
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rre->rotation == RR_Rotate_270)
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XResizeWindow(dpy, locks[screen]->win,
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rre->height, rre->width);
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else
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XResizeWindow(dpy, locks[screen]->win,
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rre->width, rre->height);
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XClearWindow(dpy, locks[screen]->win);
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break;
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}
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}
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} else {
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for (screen = 0; screen < nscreens; screen++)
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XRaiseWindow(dpy, locks[screen]->win);
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}
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}
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}
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static struct lock *
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lockscreen(Display *dpy, struct xrandr *rr, int screen)
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{
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char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
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int i, ptgrab, kbgrab;
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struct lock *lock;
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XColor color, dummy;
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XSetWindowAttributes wa;
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Cursor invisible;
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if (dpy == NULL || screen < 0 || !(lock = malloc(sizeof(struct lock))))
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return NULL;
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lock->screen = screen;
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lock->root = RootWindow(dpy, lock->screen);
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if(image)
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{
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lock->bgmap = XCreatePixmap(dpy, lock->root, DisplayWidth(dpy, lock->screen), DisplayHeight(dpy, lock->screen), DefaultDepth(dpy, lock->screen));
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imlib_context_set_display(dpy);
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imlib_context_set_visual(DefaultVisual(dpy, lock->screen));
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imlib_context_set_colormap(DefaultColormap(dpy, lock->screen));
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imlib_context_set_drawable(lock->bgmap);
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imlib_render_image_on_drawable(0, 0);
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imlib_free_image();
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}
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for (i = 0; i < NUMCOLS; i++) {
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XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen),
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colorname[i], &color, &dummy);
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lock->colors[i] = color.pixel;
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}
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/* init */
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wa.override_redirect = 1;
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wa.background_pixel = lock->colors[INIT];
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lock->win = XCreateWindow(dpy, lock->root, 0, 0,
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DisplayWidth(dpy, lock->screen),
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DisplayHeight(dpy, lock->screen),
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0, DefaultDepth(dpy, lock->screen),
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CopyFromParent,
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DefaultVisual(dpy, lock->screen),
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CWOverrideRedirect | CWBackPixel, &wa);
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if(lock->bgmap)
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XSetWindowBackgroundPixmap(dpy, lock->win, lock->bgmap);
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lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
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invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap,
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&color, &color, 0, 0);
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XDefineCursor(dpy, lock->win, invisible);
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/* Try to grab mouse pointer *and* keyboard for 600ms, else fail the lock */
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for (i = 0, ptgrab = kbgrab = -1; i < 6; i++) {
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if (ptgrab != GrabSuccess) {
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ptgrab = XGrabPointer(dpy, lock->root, False,
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ButtonPressMask | ButtonReleaseMask |
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PointerMotionMask, GrabModeAsync,
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GrabModeAsync, None, invisible, CurrentTime);
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}
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if (kbgrab != GrabSuccess) {
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kbgrab = XGrabKeyboard(dpy, lock->root, True,
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GrabModeAsync, GrabModeAsync, CurrentTime);
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}
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/* input is grabbed: we can lock the screen */
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if (ptgrab == GrabSuccess && kbgrab == GrabSuccess) {
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XMapRaised(dpy, lock->win);
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if (rr->active)
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XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
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XSelectInput(dpy, lock->root, SubstructureNotifyMask);
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return lock;
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}
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/* retry on AlreadyGrabbed but fail on other errors */
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if ((ptgrab != AlreadyGrabbed && ptgrab != GrabSuccess) ||
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(kbgrab != AlreadyGrabbed && kbgrab != GrabSuccess))
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break;
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usleep(100000);
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}
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/* we couldn't grab all input: fail out */
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if (ptgrab != GrabSuccess)
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fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n",
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screen);
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if (kbgrab != GrabSuccess)
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fprintf(stderr, "slock: unable to grab keyboard for screen %d\n",
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screen);
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return NULL;
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}
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static void
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usage(void)
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{
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die("usage: slock [-v] [-f] [-m message] [cmd [arg ...]]\n");
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}
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int
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main(int argc, char **argv) {
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struct xrandr rr;
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struct lock **locks;
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struct passwd *pwd;
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struct group *grp;
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uid_t duid;
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gid_t dgid;
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const char *hash;
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Display *dpy;
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int i, s, nlocks, nscreens;
|
|
int count_fonts;
|
|
char **font_names;
|
|
|
|
ARGBEGIN {
|
|
case 'v':
|
|
fprintf(stderr, "slock-"VERSION"\n");
|
|
return 0;
|
|
case 'm':
|
|
message = EARGF(usage());
|
|
break;
|
|
case 'f':
|
|
if (!(dpy = XOpenDisplay(NULL)))
|
|
die("slock: cannot open display\n");
|
|
font_names = XListFonts(dpy, "*", 10000 /* list 10000 fonts*/, &count_fonts);
|
|
for (i=0; i<count_fonts; i++) {
|
|
fprintf(stderr, "%s\n", *(font_names+i));
|
|
}
|
|
return 0;
|
|
default:
|
|
usage();
|
|
} ARGEND
|
|
|
|
/* validate drop-user and -group */
|
|
errno = 0;
|
|
if (!(pwd = getpwnam(user)))
|
|
die("slock: getpwnam %s: %s\n", user,
|
|
errno ? strerror(errno) : "user entry not found");
|
|
duid = pwd->pw_uid;
|
|
errno = 0;
|
|
if (!(grp = getgrnam(group)))
|
|
die("slock: getgrnam %s: %s\n", group,
|
|
errno ? strerror(errno) : "group entry not found");
|
|
dgid = grp->gr_gid;
|
|
|
|
#ifdef __linux__
|
|
dontkillme();
|
|
#endif
|
|
|
|
/* the contents of hash are used to transport the current user name */
|
|
hash = gethash();
|
|
errno = 0;
|
|
|
|
if (!(dpy = XOpenDisplay(NULL)))
|
|
die("slock: cannot open display\n");
|
|
|
|
/* drop privileges */
|
|
if (setgroups(0, NULL) < 0)
|
|
die("slock: setgroups: %s\n", strerror(errno));
|
|
if (setgid(dgid) < 0)
|
|
die("slock: setgid: %s\n", strerror(errno));
|
|
if (setuid(duid) < 0)
|
|
die("slock: setuid: %s\n", strerror(errno));
|
|
|
|
/* Load picture */
|
|
Imlib_Image buffer = imlib_load_image(background_image);
|
|
imlib_context_set_image(buffer);
|
|
int background_image_width = imlib_image_get_width();
|
|
int background_image_height = imlib_image_get_height();
|
|
|
|
/* Create an image to be rendered */
|
|
Screen *scr = ScreenOfDisplay(dpy, DefaultScreen(dpy));
|
|
image = imlib_create_image(scr->width, scr->height);
|
|
imlib_context_set_image(image);
|
|
|
|
/* Fill the image for every X monitor */
|
|
XRRMonitorInfo *monitors;
|
|
int number_of_monitors;
|
|
monitors = XRRGetMonitors(dpy, RootWindow(dpy, XScreenNumberOfScreen(scr)), True, &number_of_monitors);
|
|
|
|
int e;
|
|
for (e = 0; e < number_of_monitors; e++) {
|
|
imlib_blend_image_onto_image(buffer, 0, 0, 0, background_image_width, background_image_height, monitors[e].x, monitors[e].y, monitors[e].width, monitors[e].height);
|
|
}
|
|
|
|
/* Clean up */
|
|
imlib_context_set_image(buffer);
|
|
imlib_free_image();
|
|
imlib_context_set_image(image);
|
|
|
|
/* check for Xrandr support */
|
|
rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
|
|
|
|
/* get number of screens in display "dpy" and blank them */
|
|
nscreens = ScreenCount(dpy);
|
|
if (!(locks = calloc(nscreens, sizeof(struct lock *))))
|
|
die("slock: out of memory\n");
|
|
for (nlocks = 0, s = 0; s < nscreens; s++) {
|
|
if ((locks[s] = lockscreen(dpy, &rr, s)) != NULL) {
|
|
writemessage(dpy, locks[s]->win, s);
|
|
nlocks++;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
XSync(dpy, 0);
|
|
|
|
/* did we manage to lock everything? */
|
|
if (nlocks != nscreens)
|
|
return 1;
|
|
|
|
/* run post-lock command */
|
|
if (argc > 0) {
|
|
switch (fork()) {
|
|
case -1:
|
|
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 */
|
|
readpw(dpy, &rr, locks, nscreens, hash);
|
|
|
|
return 0;
|
|
}
|