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466 lines
13 KiB
466 lines
13 KiB
/*
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* vim:ts=4:sw=4:expandtab
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*
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* © 2010-2011 Michael Stapelberg
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*
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* See LICENSE for licensing information
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <xcb/xcb.h>
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#include <xcb/dpms.h>
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#include <xcb/xcb_keysyms.h>
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#include <err.h>
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#include <assert.h>
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#include <security/pam_appl.h>
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/* FIXME: can we get rid of this header? */
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#include <X11/keysym.h>
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#include <getopt.h>
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#include <string.h>
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#ifndef NOLIBCAIRO
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#include <cairo.h>
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#include <cairo/cairo-xcb.h>
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#endif
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#include "keysym2ucs.h"
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#include "ucs2_to_utf8.h"
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#include "xcb.h"
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#include "cursors.h"
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static xcb_connection_t *conn;
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static xcb_cursor_t cursor;
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static xcb_key_symbols_t *symbols;
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static xcb_screen_t *scr;
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static pam_handle_t *pam_handle;
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static int input_position = 0;
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/* holds the password you enter (in UTF-8) */
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static char password[512];
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static bool modeswitch_active = false;
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static int modeswitchmask;
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static int numlockmask;
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static bool beep = false;
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#ifndef NOLIBCAIRO
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static cairo_surface_t *img = NULL;
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static cairo_t *ctx = NULL;
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static bool tile = false;
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#endif
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static void input_done() {
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if (input_position == 0)
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return;
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/* TODO: change cursor during authentication? */
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if (pam_authenticate(pam_handle, 0) == PAM_SUCCESS) {
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printf("successfully authenticated\n");
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exit(0);
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}
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fprintf(stderr, "Authentication failure\n");
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/* beep on authentication failure, if enabled */
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if (beep) {
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xcb_bell(conn, 100);
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xcb_flush(conn);
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}
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}
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/*
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* Called when we should draw the image (if any).
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*
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*/
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static void handle_expose_event() {
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#ifndef NOLIBCAIRO
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if (!ctx)
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return;
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if (tile) {
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/* create a pattern and fill a rectangle as big as the screen */
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cairo_pattern_t *pattern;
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pattern = cairo_pattern_create_for_surface(img);
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cairo_set_source(ctx, pattern);
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cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
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cairo_rectangle(ctx, 0, 0, scr->width_in_pixels, scr->height_in_pixels);
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cairo_fill(ctx);
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} else {
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/* otherwise, just paint the image */
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cairo_paint(ctx);
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}
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#endif
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xcb_flush(conn);
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}
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/*
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* Called when the user releases a key. We need to leave the Mode_switch
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* state when the user releases the Mode_switch key.
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*
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*/
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static void handle_key_release(xcb_key_release_event_t *event) {
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//printf("releasing %d, state raw = %d\n", event->detail, event->state);
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/* fix state */
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event->state &= ~numlockmask;
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xcb_keysym_t sym = xcb_key_press_lookup_keysym(symbols, event, event->state);
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if (sym == XK_Mode_switch) {
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//printf("Mode switch disabled\n");
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modeswitch_active = false;
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}
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}
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/*
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* Handle key presses. Fixes state, then looks up the key symbol for the
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* given keycode, then looks up the key symbol (as UCS-2), converts it to
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* UTF-8 and stores it in the password array.
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*
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*/
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static void handle_key_press(xcb_key_press_event_t *event) {
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//printf("keypress %d, state raw = %d\n", event->detail, event->state);
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xcb_keysym_t sym0, sym1, sym;
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if (modeswitch_active) {
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sym0 = xcb_key_press_lookup_keysym(symbols, event, 4);
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sym1 = xcb_key_press_lookup_keysym(symbols, event, 5);
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} else {
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sym0 = xcb_key_press_lookup_keysym(symbols, event, 0);
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sym1 = xcb_key_press_lookup_keysym(symbols, event, 1);
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}
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switch (sym0) {
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case XK_Mode_switch:
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//printf("Mode switch enabled\n");
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modeswitch_active = true;
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return;
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case XK_Return:
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case XK_KP_Enter:
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input_done();
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case XK_Escape:
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input_position = 0;
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password[input_position] = '\0';
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return;
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case XK_BackSpace:
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if (input_position == 0)
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return;
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/* decrement input_position to point to the previous glyph */
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u8_dec(password, &input_position);
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password[input_position] = '\0';
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//printf("new input position = %d, new password = %s\n", input_position, password);
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return;
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}
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if ((input_position + 8) >= sizeof(password))
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return;
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if ((event->state & numlockmask) && xcb_is_keypad_key(sym1)) {
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/* this key was a keypad key */
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if ((event->state & XCB_MOD_MASK_SHIFT))
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sym = sym0;
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else sym = sym1;
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} else {
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if ((event->state & XCB_MOD_MASK_SHIFT))
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sym = sym1;
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else sym = sym0;
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}
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#if 0
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/* FIXME: handle all of these? */
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printf("is_keypad_key = %d\n", xcb_is_keypad_key(sym));
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printf("is_private_keypad_key = %d\n", xcb_is_private_keypad_key(sym));
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printf("xcb_is_cursor_key = %d\n", xcb_is_cursor_key(sym));
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printf("xcb_is_pf_key = %d\n", xcb_is_pf_key(sym));
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printf("xcb_is_function_key = %d\n", xcb_is_function_key(sym));
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printf("xcb_is_misc_function_key = %d\n", xcb_is_misc_function_key(sym));
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printf("xcb_is_modifier_key = %d\n", xcb_is_modifier_key(sym));
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#endif
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if (xcb_is_modifier_key(sym) || xcb_is_cursor_key(sym))
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return;
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//printf("sym = %c (%d)\n", sym, sym);
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/* convert the keysym to UCS */
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uint16_t ucs = keysym2ucs(sym);
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if ((int16_t)ucs == -1) {
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fprintf(stderr, "Keysym could not be converted to UCS, skipping\n");
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return;
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}
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/* store the UCS in a string to convert it */
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uint8_t inp[3] = {(ucs & 0xFF00) >> 8, (ucs & 0xFF), 0};
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/* store it in the password array as UTF-8 */
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input_position += convert_ucs_to_utf8((char*)inp, password + input_position);
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password[input_position] = '\0';
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//printf("current password = %s\n", password);
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}
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/*
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* A visibility notify event will be received when the visibility (= can the
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* user view the complete window) changes, so for example when a popup overlays
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* some area of the i3lock window.
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*
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* In this case, we raise our window on top so that the popup (or whatever is
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* hiding us) gets hidden.
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*
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*/
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static void handle_visibility_notify(xcb_visibility_notify_event_t *event) {
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if (event->state != XCB_VISIBILITY_UNOBSCURED) {
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uint32_t values[] = { XCB_STACK_MODE_ABOVE };
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xcb_configure_window(conn, event->window, XCB_CONFIG_WINDOW_STACK_MODE, values);
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xcb_flush(conn);
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}
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}
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/*
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* Called when the keyboard mapping changes. We update our symbols and re-grab
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* pointer/keyboard.
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*
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*/
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static void handle_mapping_notify(xcb_mapping_notify_event_t *event) {
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xcb_refresh_keyboard_mapping(symbols, event);
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xcb_ungrab_pointer(conn, XCB_CURRENT_TIME);
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xcb_ungrab_keyboard(conn, XCB_CURRENT_TIME);
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grab_pointer_and_keyboard(conn, scr, cursor);
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modeswitchmask = get_mod_mask(conn, symbols, XK_Mode_switch);
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numlockmask = get_mod_mask(conn, symbols, XK_Num_Lock);
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xcb_flush(conn);
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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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{
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if (num_msg == 0)
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return 1;
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/* PAM expects an array 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(password)) == 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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bool dont_fork = false;
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bool dpms = false;
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char color[7] = "ffffff";
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char *username;
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#ifndef NOLIBCAIRO
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char *image_path = NULL;
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#endif
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int ret;
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struct pam_conv conv = {conv_callback, NULL};
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int screen;
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xcb_visualtype_t *vistype;
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xcb_generic_event_t *event;
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xcb_window_t win;
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int curs_choice = CURS_NONE;
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char o;
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int optind = 0;
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struct option longopts[] = {
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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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{"color", required_argument, NULL, 'c'},
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{"pointer", required_argument, NULL , 'p'},
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#ifndef NOLIBCAIRO
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{"image", required_argument, NULL, 'i'},
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{"tiling", no_argument, NULL, 't'},
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#endif
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{NULL, no_argument, NULL, 0}
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};
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if ((username = getenv("USER")) == NULL)
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errx(1, "USER environment variable not set, please set it.\n");
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while ((o = getopt_long(argc, argv, "vnbdc:p:"
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#ifndef NOLIBCAIRO
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"i:t"
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#endif
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, longopts, &optind)) != -1) {
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switch (o) {
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case 'v':
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errx(EXIT_SUCCESS, "version " VERSION " © 2010-2011 Michael Stapelberg\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 'c': {
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char *arg = optarg;
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/* Skip # if present */
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if (arg[0] == '#')
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arg++;
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if (strlen(arg) != 6 || sscanf(arg, "%06[0-9a-fA-F]", color) != 1)
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errx(1, "color is invalid, color must be given in 6-byte format: rrggbb\n");
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break;
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}
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#ifndef NOLIBCAIRO
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case 'i':
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image_path = strdup(optarg);
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break;
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case 't':
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tile = true;
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break;
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#endif
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case 'p':
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if (!strcmp(optarg, "win")) {
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curs_choice = CURS_WIN;
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}
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if (!strcmp(optarg, "default")) {
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curs_choice = CURS_DEFAULT;
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}
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break;
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default:
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errx(1, "i3lock: Unknown option. Syntax: i3lock [-v] [-n] [-b] [-d] [-c color] [-p win|default]"
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#ifndef NOLIBCAIRO
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" [-i image.png] [-t]"
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#else
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" (compiled with NOLIBCAIRO)"
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#endif
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"\n");
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}
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}
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/* Initialize PAM */
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ret = pam_start("i3lock", username, &conv, &pam_handle);
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if (ret != PAM_SUCCESS)
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errx(EXIT_FAILURE, "PAM: %s\n", pam_strerror(pam_handle, ret));
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/* Initialize connection to X11 */
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if ((conn = xcb_connect(NULL, &screen)) == NULL ||
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xcb_connection_has_error(conn))
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errx(EXIT_FAILURE, "Could not connect to X11, maybe you need to set DISPLAY?");
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if (!dont_fork) {
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/* In the parent process, we exit */
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if (fork() != 0)
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return 0;
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}
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/* if DPMS is enabled, check if the X server really supports it */
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if (dpms) {
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xcb_dpms_capable_cookie_t dpmsc = xcb_dpms_capable(conn);
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xcb_dpms_capable_reply_t *dpmsr;
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if ((dpmsr = xcb_dpms_capable_reply(conn, dpmsc, NULL)) && !dpmsr->capable) {
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fprintf(stderr, "Disabling DPMS, X server not DPMS capable\n");
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dpms = false;
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}
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}
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scr = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
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vistype = get_root_visual_type(scr);
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/* open the fullscreen window and flush immediately afterwards so that X11
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* can generate an expose event while we load the PNG file (so that we are
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* ready to handle the expose event immediately afterwards) */
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win = open_fullscreen_window(conn, scr, color);
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cursor = create_cursor(conn, scr, win, curs_choice);
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grab_pointer_and_keyboard(conn, scr, cursor);
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symbols = xcb_key_symbols_alloc(conn);
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modeswitchmask = get_mod_mask(conn, symbols, XK_Mode_switch);
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numlockmask = get_mod_mask(conn, symbols, XK_Num_Lock);
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#ifndef NOLIBCAIRO
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if (image_path)
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img = cairo_image_surface_create_from_png(image_path);
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if (img) {
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/* Initialize cairo */
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cairo_surface_t *output;
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output = cairo_xcb_surface_create(conn, win, vistype,
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scr->width_in_pixels, scr->height_in_pixels);
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ctx = cairo_create(output);
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if (!tile)
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cairo_set_source_surface(ctx, img, 0, 0);
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handle_expose_event();
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}
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#endif
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if (dpms)
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dpms_turn_off_screen(conn);
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while ((event = xcb_wait_for_event(conn))) {
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if (event->response_type == 0)
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errx(1, "XCB: Invalid event received");
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/* Strip off the highest bit (set if the event is generated) */
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int type = (event->response_type & 0x7F);
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if (type == XCB_EXPOSE) {
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handle_expose_event();
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continue;
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}
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if (type == XCB_KEY_PRESS) {
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handle_key_press((xcb_key_press_event_t*)event);
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continue;
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}
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if (type == XCB_KEY_RELEASE) {
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handle_key_release((xcb_key_release_event_t*)event);
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/* If this was the backspace or escape key we are back at an
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* empty input, so turn off the screen if DPMS is enabled */
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if (dpms && input_position == 0)
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dpms_turn_off_screen(conn);
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continue;
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}
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if (type == XCB_VISIBILITY_NOTIFY) {
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handle_visibility_notify((xcb_visibility_notify_event_t*)event);
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continue;
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}
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if (type == XCB_MAPPING_NOTIFY) {
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handle_mapping_notify((xcb_mapping_notify_event_t*)event);
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continue;
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}
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printf("WARNING: unhandled event of type %d\n", type);
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}
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return 0;
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}
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