mirror of https://github.com/i3/i3lock.git
299 lines
9.9 KiB
C
299 lines
9.9 KiB
C
/*
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* vim:ts=8:expandtab
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*
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* i3lock - an improved version of slock
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*
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* i3lock © 2009 Michael Stapelberg and contributors
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* slock © 2006-2008 Anselm R Garbe
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*
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* See file LICENSE for license information.
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*
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* Note that on any error (calloc is out of memory for example)
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* we do not do anything so that the user can fix the error by
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* himself (kill X to get more free memory or stop some other
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* program using SSH/console).
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*
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*/
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#define _XOPEN_SOURCE 500
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#include <ctype.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/keysym.h>
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#include <X11/xpm.h>
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#include <X11/extensions/dpms.h>
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#include <stdbool.h>
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#include <getopt.h>
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#include <security/pam_appl.h>
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static char passwd[256];
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static void die(const char *errstr, ...) {
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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(EXIT_FAILURE);
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}
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/*
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* Check if given file can be opened => exists
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*
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*/
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bool file_exists(const char *filename)
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{
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FILE * file = fopen(filename, "r");
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if(file)
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{
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fclose(file);
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return true;
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}
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return false;
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}
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/*
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* Puts the given XPM error code to stderr
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*
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*/
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void print_xpm_error(int err)
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{
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switch (err) {
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case XpmColorError:
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fprintf(stderr, "XPM: Could not parse or alloc requested color\n");
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break;
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case XpmOpenFailed:
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fprintf(stderr, "XPM: Cannot open file\n");
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break;
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case XpmFileInvalid:
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fprintf(stderr, "XPM: invalid XPM file\n");
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break;
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case XpmNoMemory:
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fprintf(stderr, "XPM: Not enough memory\n");
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break;
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case XpmColorFailed:
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fprintf(stderr, "XPM: Color not found\n");
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break;
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}
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}
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/*
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* Callback function for PAM. We only react on password request callbacks.
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*
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*/
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static int conv_callback(int num_msg, const struct pam_message **msg,
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struct pam_response **resp, void *appdata_ptr) {
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if (num_msg == 0)
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return 1;
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/* PAM expects an arry of responses, one for each message */
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if ((*resp = calloc(num_msg, sizeof(struct pam_message))) == NULL) {
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perror("calloc");
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return 1;
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}
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for (int c = 0; c < num_msg; c++) {
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if (msg[c]->msg_style != PAM_PROMPT_ECHO_OFF &&
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msg[c]->msg_style != PAM_PROMPT_ECHO_ON)
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continue;
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/* return code is currently not used but should be set to zero */
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resp[c]->resp_retcode = 0;
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if ((resp[c]->resp = strdup(passwd)) == NULL) {
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perror("strdup");
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return 1;
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}
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}
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return 0;
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}
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int main(int argc, char *argv[]) {
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char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
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char buf[32];
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char *username;
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int num, screen;
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unsigned int len;
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bool running = true;
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/* By default, fork, don’t beep and don’t turn off monitor */
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bool dont_fork = false;
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bool beep = false;
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bool dpms = false;
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bool xpm_image = false;
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char xpm_image_path[256];
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Cursor invisible;
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Display *dpy;
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KeySym ksym;
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Pixmap pmap;
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Window root, w;
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XColor black, dummy;
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XEvent ev;
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XSetWindowAttributes wa;
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pam_handle_t *handle;
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struct pam_conv conv = {conv_callback, NULL};
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char opt;
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int optind = 0;
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static struct option long_options[] = {
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{"version", no_argument, NULL, 'v'},
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{"nofork", no_argument, NULL, 'n'},
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{"beep", no_argument, NULL, 'b'},
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{"dpms", no_argument, NULL, 'd'},
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{"image", required_argument, NULL, 'i'},
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{NULL, no_argument, NULL, 0}
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};
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while ((opt = getopt_long(argc, argv, "vnbdi:", long_options, &optind)) != -1) {
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switch (opt) {
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case 'v':
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die("i3lock-"VERSION", © 2009 Michael Stapelberg\n"
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"based on slock, which is © 2006-2008 Anselm R Garbe\n");
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case 'n':
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dont_fork = true;
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break;
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case 'b':
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beep = true;
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break;
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case 'd':
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dpms = true;
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break;
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case 'i':
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strncpy(xpm_image_path, optarg, 255);
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xpm_image = true;
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break;
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default:
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die("i3lock: Unknown option. Syntax: i3lock [-v] [-n] [-b] [-d] [-i image.xpm]\n");
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}
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}
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if ((username = getenv("USER")) == NULL)
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die("USER environment variable not set, please set it.\n");
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int ret = pam_start("i3lock", username, &conv, &handle);
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if (ret != PAM_SUCCESS)
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die("PAM: %s\n", pam_strerror(handle, ret));
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if(!(dpy = XOpenDisplay(0)))
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die("i3lock: cannot open display\n");
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screen = DefaultScreen(dpy);
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root = RootWindow(dpy, screen);
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if (!dont_fork) {
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if (fork() != 0)
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return 0;
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}
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/* init */
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wa.override_redirect = 1;
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wa.background_pixel = WhitePixel(dpy, screen);
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w = XCreateWindow(dpy, root, 0, 0, DisplayWidth(dpy, screen), DisplayHeight(dpy, screen),
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0, DefaultDepth(dpy, screen), CopyFromParent,
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DefaultVisual(dpy, screen), CWOverrideRedirect | CWBackPixel, &wa);
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XAllocNamedColor(dpy, DefaultColormap(dpy, screen), "black", &black, &dummy);
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pmap = XCreateBitmapFromData(dpy, w, curs, 8, 8);
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invisible = XCreatePixmapCursor(dpy, pmap, pmap, &black, &black, 0, 0);
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XDefineCursor(dpy, w, invisible);
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XMapRaised(dpy, w);
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if(xpm_image && file_exists(xpm_image_path))
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{
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GC gc = XDefaultGC(dpy, 0);
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int depth = DefaultDepth(dpy, screen);
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int disp_width = DisplayWidth(dpy, screen);
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int disp_height = DisplayHeight(dpy, screen);
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Pixmap pix = XCreatePixmap(dpy, w, disp_width, disp_height, depth);
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int err = XpmReadFileToPixmap(dpy, w, xpm_image_path, &pix, 0, 0);
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if (err != 0) {
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print_xpm_error(err);
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return 1;
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}
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XCopyArea(dpy, pix, w, gc, 0, 0, disp_width, disp_height, 0, 0);
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}
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for(len = 1000; len; len--) {
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if(XGrabPointer(dpy, root, False, ButtonPressMask | ButtonReleaseMask,
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GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess)
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break;
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usleep(1000);
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}
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if((running = running && (len > 0))) {
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for(len = 1000; len; len--) {
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if(XGrabKeyboard(dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
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== GrabSuccess)
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break;
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usleep(1000);
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}
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running = (len > 0);
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}
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len = 0;
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XSync(dpy, False);
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/* main event loop */
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while(running && !XNextEvent(dpy, &ev)) {
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if (len == 0 && dpms && DPMSCapable(dpy)) {
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DPMSEnable(dpy);
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DPMSForceLevel(dpy, DPMSModeOff);
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}
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if(ev.type != KeyPress)
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continue;
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buf[0] = 0;
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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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if ((ret = pam_authenticate(handle, 0)) == PAM_SUCCESS)
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running = false;
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else {
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fprintf(stderr, "PAM: %s\n", pam_strerror(handle, ret));
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if (beep)
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XBell(dpy, 100);
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}
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len = 0;
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break;
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case XK_Escape:
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len = 0;
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break;
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case XK_BackSpace:
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if (len > 0)
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len--;
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break;
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default:
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if(num && !iscntrl((int) buf[0]) && (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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}
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XUngrabPointer(dpy, CurrentTime);
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XFreePixmap(dpy, pmap);
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XDestroyWindow(dpy, w);
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XCloseDisplay(dpy);
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return 0;
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}
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