2 * vim:ts=4:sw=4:expandtab
4 * © 2010 Michael Stapelberg
6 * See LICENSE for licensing information
17 #include <xcb/xcb_keysyms.h>
21 #include <security/pam_appl.h>
22 /* FIXME: can we get rid of this header? */
23 #include <X11/keysym.h>
27 #include "keysym2ucs.h"
28 #include "ucs2_to_utf8.h"
31 static xcb_connection_t *conn;
32 static xcb_key_symbols_t *symbols;
33 static cairo_t *ctx = NULL;
34 static pam_handle_t *pam_handle;
35 static int input_position = 0;
36 /* holds the password you enter (in UTF-8) */
37 static char password[512];
38 static bool modeswitch_active = false;
39 static int modeswitchmask;
40 static int numlockmask;
41 static bool beep = false;
43 static void input_done() {
44 if (input_position == 0)
47 /* TODO: change cursor during authentication? */
48 if (pam_authenticate(pam_handle, 0) == PAM_SUCCESS) {
49 printf("successfully authenticated\n");
53 /* beep on authentication failure, if enabled */
61 * Called when we should draw the image (if any).
64 static void handle_expose_event() {
73 * Called when the user releases a key. We need to leave the Mode_switch
74 * state when the user releases the Mode_switch key.
77 static void handle_key_release(xcb_key_release_event_t *event) {
78 printf("releasing %d, state raw = %d\n", event->detail, event->state);
81 event->state &= ~numlockmask;
83 xcb_keysym_t sym = xcb_key_press_lookup_keysym(symbols, event, event->state);
84 if (sym == XK_Mode_switch) {
85 printf("Mode switch disabled\n");
86 modeswitch_active = false;
91 * Handle key presses. Fixes state, then looks up the key symbol for the
92 * given keycode, then looks up the key symbol (as UCS-2), converts it to
93 * UTF-8 and stores it in the password array.
96 static void handle_key_press(xcb_key_press_event_t *event) {
97 printf("keypress %d, state raw = %d\n", event->detail, event->state);
100 if (modeswitch_active)
101 event->state |= modeswitchmask;
103 /* Apparantly, after activating numlock once, the numlock modifier
104 * stays turned on (use xev(1) to verify). So, to resolve useful
105 * keysyms, we remove the numlock flag from the event state */
106 event->state &= ~numlockmask;
108 if ((input_position + 8) >= sizeof(password))
111 xcb_keysym_t sym = xcb_key_press_lookup_keysym(symbols, event, event->state);
114 printf("Mode switch enabled\n");
115 modeswitch_active = true;
122 password[input_position] = '\0';
126 if (input_position == 0)
129 /* decrement input_position to point to the previous glyph */
130 u8_dec(password, &input_position);
131 password[input_position] = '\0';
132 printf("new input position = %d, new password = %s\n", input_position, password);
136 /* FIXME: handle all of these? */
137 printf("is_keypad_key = %d\n", xcb_is_keypad_key(sym));
138 printf("is_private_keypad_key = %d\n", xcb_is_private_keypad_key(sym));
139 printf("xcb_is_cursor_key = %d\n", xcb_is_cursor_key(sym));
140 printf("xcb_is_pf_key = %d\n", xcb_is_pf_key(sym));
141 printf("xcb_is_function_key = %d\n", xcb_is_function_key(sym));
142 printf("xcb_is_misc_function_key = %d\n", xcb_is_misc_function_key(sym));
143 printf("xcb_is_modifier_key = %d\n", xcb_is_modifier_key(sym));
145 if (xcb_is_modifier_key(sym) || xcb_is_cursor_key(sym))
148 printf("sym = %c (%d)\n", sym, sym);
150 /* convert the keysym to UCS */
151 uint16_t ucs = keysym2ucs(sym);
152 if ((int16_t)ucs == -1) {
153 fprintf(stderr, "Keysym could not be converted to UCS, skipping\n");
157 /* store the UCS in a string to convert it */
158 uint8_t inp[3] = {(ucs & 0xFF00) >> 8, (ucs & 0xFF), 0};
160 /* store it in the password array as UTF-8 */
161 input_position += convert_ucs_to_utf8((char*)inp, password + input_position);
162 password[input_position] = '\0';
163 printf("current password = %s\n", password);
167 * A visibility notify event will be received when the visibility (= can the
168 * user view the complete window) changes, so for example when a popup overlays
169 * some area of the i3lock window.
171 * In this case, we raise our window on top so that the popup (or whatever is
172 * hiding us) gets hidden.
175 void handle_visibility_notify(xcb_visibility_notify_event_t *event) {
176 printf("visibility notify (window 0x%08x, state %d)\n", event->window, event->state);
177 if (event->state != XCB_VISIBILITY_UNOBSCURED) {
178 printf("window is obscured (not fully visible), raising\n");
179 uint32_t values[] = { XCB_STACK_MODE_ABOVE };
180 xcb_configure_window(conn, event->window, XCB_CONFIG_WINDOW_STACK_MODE, values);
186 * Callback function for PAM. We only react on password request callbacks.
189 static int conv_callback(int num_msg, const struct pam_message **msg,
190 struct pam_response **resp, void *appdata_ptr)
195 /* PAM expects an array of responses, one for each message */
196 if ((*resp = calloc(num_msg, sizeof(struct pam_message))) == NULL) {
201 for (int c = 0; c < num_msg; c++) {
202 if (msg[c]->msg_style != PAM_PROMPT_ECHO_OFF &&
203 msg[c]->msg_style != PAM_PROMPT_ECHO_ON)
206 /* return code is currently not used but should be set to zero */
207 resp[c]->resp_retcode = 0;
208 if ((resp[c]->resp = strdup(password)) == NULL) {
217 int main(int argc, char *argv[]) {
218 bool dont_fork = false;
220 char color[7] = "ffffff";
222 char *image_path = NULL;
224 struct pam_conv conv = {conv_callback, NULL};
226 cairo_surface_t *img = NULL;
227 xcb_visualtype_t *vistype;
228 xcb_generic_event_t *event;
233 struct option longopts[] = {
234 {"version", no_argument, NULL, 'v'},
235 {"nofork", no_argument, NULL, 'n'},
236 {"beep", no_argument, NULL, 'b'},
237 {"dpms", no_argument, NULL, 'd'},
238 {"image", required_argument, NULL, 'i'},
239 {"color", required_argument, NULL, 'c'},
240 {"tiling", no_argument, NULL, 't'},
241 {"pointer", required_argument, NULL , 'p'},
242 {NULL, no_argument, NULL, 0}
245 if ((username = getenv("USER")) == NULL)
246 errx(1, "USER environment variable not set, please set it.\n");
248 while ((o = getopt_long(argc, argv, "vnbdi:c:tp:", longopts, &optind)) != -1) {
251 errx(EXIT_SUCCESS, "i3lock © 2010 Michael Stapelberg\n");
262 image_path = strdup(optarg);
267 /* Skip # if present */
271 if (strlen(arg) != 6 || sscanf(arg, "%06[0-9a-fA-F]", color) != 1)
272 errx(1, "color is invalid, color must be given in 6-byte format: rrggbb\n");
277 /* TODO: tile image */
283 errx(1, "i3lock: Unknown option. Syntax: i3lock [-v] [-n] [-b] [-d] [-i image.png] [-c color] [-t] [-p win|default]\n");
288 ret = pam_start("i3lock", username, &conv, &pam_handle);
289 if (ret != PAM_SUCCESS)
290 errx(EXIT_FAILURE, "PAM: %s\n", pam_strerror(pam_handle, ret));
292 /* Initialize connection to X11 */
293 if ((conn = xcb_connect(NULL, &screen)) == NULL)
294 err(EXIT_FAILURE, "xcb_connect()");
297 /* In the parent process, we exit */
302 /* if DPMS is enabled, check if the X server really supports it */
304 xcb_dpms_capable_cookie_t dpmsc = xcb_dpms_capable(conn);
305 xcb_dpms_capable_reply_t *dpmsr;
306 if ((dpmsr = xcb_dpms_capable_reply(conn, dpmsc, NULL)) && !dpmsr->capable) {
307 fprintf(stderr, "Disabling DPMS, X server not DPMS capable\n");
312 scr = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
313 vistype = get_root_visual_type(scr);
315 /* open the fullscreen window and flush immediately afterwards so that X11
316 * can generate an expose event while we load the PNG file (so that we are
317 * ready to handle the expose event immediately afterwards) */
318 win = open_fullscreen_window(conn, scr, color);
320 grab_pointer_and_keyboard(conn, scr);
323 img = cairo_image_surface_create_from_png(image_path);
325 symbols = xcb_key_symbols_alloc(conn);
326 modeswitchmask = get_mod_mask(conn, symbols, XK_Mode_switch);
327 numlockmask = get_mod_mask(conn, symbols, XK_Num_Lock);
331 /* Initialize cairo */
332 cairo_surface_t *output;
333 output = cairo_xcb_surface_create(conn, win, vistype,
334 scr->width_in_pixels, scr->height_in_pixels);
335 /* TODO: tiling of the image */
336 ctx = cairo_create(output);
337 cairo_set_source_surface(ctx, img, 0, 0);
339 handle_expose_event();
343 dpms_turn_off_screen(conn);
345 while ((event = xcb_wait_for_event(conn))) {
346 if (event->response_type == 0)
347 errx(1, "XCB: Invalid event received");
349 /* Strip off the highest bit (set if the event is generated) */
350 int type = (event->response_type & 0x7F);
352 if (type == XCB_EXPOSE) {
353 handle_expose_event();
357 if (type == XCB_KEY_PRESS) {
358 handle_key_press((xcb_key_press_event_t*)event);
362 if (type == XCB_KEY_RELEASE) {
363 handle_key_release((xcb_key_release_event_t*)event);
365 /* If this was the backspace or escape key we are back at an
366 * empty input, so turn off the screen if DPMS is enabled */
367 if (dpms && input_position == 0)
368 dpms_turn_off_screen(conn);
373 if (type == XCB_VISIBILITY_NOTIFY) {
374 handle_visibility_notify((xcb_visibility_notify_event_t*)event);
378 printf("WARNING: unhandled event of type %d\n", type);