/*

* vim:ts=4:sw=4:expandtab

*

* © 2010 Michael Stapelberg

*

* See LICENSE for licensing information

*

*/

#include <stdio.h>

#include <stdlib.h>

#include <pwd.h>

#include <sys/types.h>

#include <string.h>

#include <unistd.h>

#include <stdbool.h>

#include <stdint.h>

#include <xcb/xcb.h>

#include <xcb/xkb.h>

#include <err.h>

#include <assert.h>

#include <security/pam_appl.h>

#include <getopt.h>

#include <string.h>

#include <ev.h>

#include <sys/mman.h>

#include <xkbcommon/xkbcommon.h>

#include <xkbcommon/xkbcommon-compose.h>

#include <xkbcommon/xkbcommon-x11.h>

#include <cairo.h>

#include <cairo/cairo-xcb.h>

#include <SDL2/SDL_image.h>

#include "i3lock.h"

#include "xcb.h"

#include "cursors.h"

#include "unlock_indicator.h"

#include "xinerama.h"

#define TSTAMP_N_SECS(n) (n * 1.0)

#define TSTAMP_N_MINS(n) (60 * TSTAMP_N_SECS(n))

#define START_TIMER(timer_obj, timeout, callback) \

timer_obj = start_timer(timer_obj, timeout, callback)

#define STOP_TIMER(timer_obj) \

timer_obj = stop_timer(timer_obj)

typedef void (*ev_callback_t)(EV_P_ ev_timer *w, int revents);

char color[7] = "ffffff";

int inactivity_timeout = 30;

uint32_t last_resolution[2];

xcb_window_t win;

static xcb_cursor_t cursor;

static pam_handle_t *pam_handle;

int input_position = 0;

/* Holds the password you enter (in UTF-8). */

static char password[512];

static bool beep = false;

bool debug_mode = false;

bool unlock_indicator = true;

char *modifier_string = NULL;

static bool dont_fork = false;

struct ev_loop *main_loop;

static struct ev_timer *clear_pam_wrong_timeout;

static struct ev_timer *clear_indicator_timeout;

static struct ev_timer *discard_passwd_timeout;

extern unlock_state_t unlock_state;

extern pam_state_t pam_state;

int failed_attempts = 0;

bool show_failed_attempts = false;

static struct xkb_state *xkb_state;

static struct xkb_context *xkb_context;

static struct xkb_keymap *xkb_keymap;

static struct xkb_compose_table *xkb_compose_table;

static struct xkb_compose_state *xkb_compose_state;

static uint8_t xkb_base_event;

static uint8_t xkb_base_error;

SDL_Surface *sdl_surface = NULL;

cairo_surface_t *img = NULL;

bool tile = false;

bool ignore_empty_password = false;

bool skip_repeated_empty_password = false;

/* isutf, u8_dec © 2005 Jeff Bezanson, public domain */

#define isutf(c) (((c)&0xC0) != 0x80)

/*

* Decrements i to point to the previous unicode glyph

*

*/

void u8_dec(char *s, int *i) {

(void)(isutf(s[--(*i)]) || isutf(s[--(*i)]) || isutf(s[--(*i)]) || --(*i));

}

/*

* Loads the XKB keymap from the X11 server and feeds it to xkbcommon.

* Necessary so that we can properly let xkbcommon track the keyboard state and

* translate keypresses to utf-8.

*

*/

static bool load_keymap(void) {

if (xkb_context == NULL) {

if ((xkb_context = xkb_context_new(0)) == NULL) {

fprintf(stderr, "[i3lock] could not create xkbcommon context\n");

return false;

}

}

xkb_keymap_unref(xkb_keymap);

int32_t device_id = xkb_x11_get_core_keyboard_device_id(conn);

DEBUG("device = %d\n", device_id);

if ((xkb_keymap = xkb_x11_keymap_new_from_device(xkb_context, conn, device_id, 0)) == NULL) {

fprintf(stderr, "[i3lock] xkb_x11_keymap_new_from_device failed\n");

return false;

}

struct xkb_state *new_state =

xkb_x11_state_new_from_device(xkb_keymap, conn, device_id);

if (new_state == NULL) {

fprintf(stderr, "[i3lock] xkb_x11_state_new_from_device failed\n");

return false;

}

xkb_state_unref(xkb_state);

xkb_state = new_state;

return true;

}

/*

* Loads the XKB compose table from the given locale.

*

*/

static bool load_compose_table(const char *locale) {

xkb_compose_table_unref(xkb_compose_table);

if ((xkb_compose_table = xkb_compose_table_new_from_locale(xkb_context, locale, 0)) == NULL) {

fprintf(stderr, "[i3lock] xkb_compose_table_new_from_locale failed\n");

return false;

}

struct xkb_compose_state *new_compose_state = xkb_compose_state_new(xkb_compose_table, 0);

if (new_compose_state == NULL) {

fprintf(stderr, "[i3lock] xkb_compose_state_new failed\n");

return false;

}

xkb_compose_state_unref(xkb_compose_state);

xkb_compose_state = new_compose_state;

return true;

}

/*

* Clears the memory which stored the password to be a bit safer against

* cold-boot attacks.

*

*/

static void clear_password_memory(void) {

/* A volatile pointer to the password buffer to prevent the compiler from

* optimizing this out. */

volatile char *vpassword = password;

for (int c = 0; c < sizeof(password); c++)

/* We store a non-random pattern which consists of the (irrelevant)

* index plus (!) the value of the beep variable. This prevents the

* compiler from optimizing the calls away, since the value of 'beep'

* is not known at compile-time. */

vpassword[c] = c + (int)beep;

}

ev_timer *start_timer(ev_timer *timer_obj, ev_tstamp timeout, ev_callback_t callback) {

if (timer_obj) {

ev_timer_stop(main_loop, timer_obj);

ev_timer_set(timer_obj, timeout, 0.);

ev_timer_start(main_loop, timer_obj);

} else {

/* When there is no memory, we just don’t have a timeout. We cannot

* exit() here, since that would effectively unlock the screen. */

timer_obj = calloc(sizeof(struct ev_timer), 1);

if (timer_obj) {

ev_timer_init(timer_obj, callback, timeout, 0.);

ev_timer_start(main_loop, timer_obj);

}

}

return timer_obj;

}

ev_timer *stop_timer(ev_timer *timer_obj) {

if (timer_obj) {

ev_timer_stop(main_loop, timer_obj);

free(timer_obj);

}

return NULL;

}

/*

* Resets pam_state to STATE_PAM_IDLE 2 seconds after an unsuccessful

* authentication event.

*

*/

static void clear_pam_wrong(EV_P_ ev_timer *w, int revents) {

DEBUG("clearing pam wrong\n");

pam_state = STATE_PAM_IDLE;

redraw_screen();

/* Clear modifier string. */

if (modifier_string != NULL) {

free(modifier_string);

modifier_string = NULL;

}

/* Now free this timeout. */

STOP_TIMER(clear_pam_wrong_timeout);

}

static void clear_indicator_cb(EV_P_ ev_timer *w, int revents) {

clear_indicator();

STOP_TIMER(clear_indicator_timeout);

}

static void clear_input(void) {

input_position = 0;

clear_password_memory();

password[input_position] = '\0';

}

static void discard_passwd_cb(EV_P_ ev_timer *w, int revents) {

clear_input();

STOP_TIMER(discard_passwd_timeout);

}

static void input_done(void) {

STOP_TIMER(clear_pam_wrong_timeout);

pam_state = STATE_PAM_VERIFY;

unlock_state = STATE_STARTED;

redraw_screen();

if (pam_authenticate(pam_handle, 0) == PAM_SUCCESS) {

DEBUG("successfully authenticated\n");

clear_password_memory();

/* PAM credentials should be refreshed, this will for example update any kerberos tickets.

* Related to credentials pam_end() needs to be called to cleanup any temporary

* credentials like kerberos /tmp/krb5cc_pam_* files which may of been left behind if the

* refresh of the credentials failed. */

pam_setcred(pam_handle, PAM_REFRESH_CRED);

pam_end(pam_handle, PAM_SUCCESS);

exit(0);

}

if (debug_mode)

fprintf(stderr, "Authentication failure\n");

/* Get state of Caps and Num lock modifiers, to be displayed in

* STATE_PAM_WRONG state */

xkb_mod_index_t idx, num_mods;

const char *mod_name;

num_mods = xkb_keymap_num_mods(xkb_keymap);

for (idx = 0; idx < num_mods; idx++) {

if (!xkb_state_mod_index_is_active(xkb_state, idx, XKB_STATE_MODS_EFFECTIVE))

continue;

mod_name = xkb_keymap_mod_get_name(xkb_keymap, idx);

if (mod_name == NULL)

continue;

/* Replace certain xkb names with nicer, human-readable ones. */

if (strcmp(mod_name, XKB_MOD_NAME_CAPS) == 0)

mod_name = "Caps Lock";

else if (strcmp(mod_name, XKB_MOD_NAME_ALT) == 0)

mod_name = "Alt";

else if (strcmp(mod_name, XKB_MOD_NAME_NUM) == 0)

mod_name = "Num Lock";

else if (strcmp(mod_name, XKB_MOD_NAME_LOGO) == 0)

mod_name = "Win";

char *tmp;

if (modifier_string == NULL) {

if (asprintf(&tmp, "%s", mod_name) != -1)

modifier_string = tmp;

} else if (asprintf(&tmp, "%s, %s", modifier_string, mod_name) != -1) {

free(modifier_string);

modifier_string = tmp;

}

}

pam_state = STATE_PAM_WRONG;

failed_attempts += 1;

clear_input();

if (unlock_indicator)

redraw_screen();

/* Clear this state after 2 seconds (unless the user enters another

* password during that time). */

ev_now_update(main_loop);

START_TIMER(clear_pam_wrong_timeout, TSTAMP_N_SECS(2), clear_pam_wrong);

/* Cancel the clear_indicator_timeout, it would hide the unlock indicator

* too early. */

STOP_TIMER(clear_indicator_timeout);

/* beep on authentication failure, if enabled */

if (beep) {

xcb_bell(conn, 100);

xcb_flush(conn);

}

}

static void redraw_timeout(EV_P_ ev_timer *w, int revents) {

redraw_screen();

STOP_TIMER(w);

}

static bool skip_without_validation(void) {

if (input_position != 0)

return false;

if (skip_repeated_empty_password || ignore_empty_password)

return true;

return false;

}

/*

* Handle key presses. Fixes state, then looks up the key symbol for the

* given keycode, then looks up the key symbol (as UCS-2), converts it to

* UTF-8 and stores it in the password array.

*

*/

static void handle_key_press(xcb_key_press_event_t *event) {

xkb_keysym_t ksym;

char buffer[128];

int n;

bool ctrl;

bool composed = false;

ksym = xkb_state_key_get_one_sym(xkb_state, event->detail);

ctrl = xkb_state_mod_name_is_active(xkb_state, XKB_MOD_NAME_CTRL, XKB_STATE_MODS_DEPRESSED);

/* The buffer will be null-terminated, so n >= 2 for 1 actual character. */

memset(buffer, '\0', sizeof(buffer));

if (xkb_compose_state && xkb_compose_state_feed(xkb_compose_state, ksym) == XKB_COMPOSE_FEED_ACCEPTED) {

switch (xkb_compose_state_get_status(xkb_compose_state)) {

case XKB_COMPOSE_NOTHING:

break;

case XKB_COMPOSE_COMPOSING:

return;

case XKB_COMPOSE_COMPOSED:

/* xkb_compose_state_get_utf8 doesn't include the terminating byte in the return value

* as xkb_keysym_to_utf8 does. Adding one makes the variable n consistent. */

n = xkb_compose_state_get_utf8(xkb_compose_state, buffer, sizeof(buffer)) + 1;

ksym = xkb_compose_state_get_one_sym(xkb_compose_state);

composed = true;

break;

case XKB_COMPOSE_CANCELLED:

xkb_compose_state_reset(xkb_compose_state);

return;

}

}

if (!composed) {

n = xkb_keysym_to_utf8(ksym, buffer, sizeof(buffer));

}

switch (ksym) {

case XKB_KEY_j:

case XKB_KEY_Return:

case XKB_KEY_KP_Enter:

case XKB_KEY_XF86ScreenSaver:

if (ksym == XKB_KEY_j && !ctrl)

break;

if (pam_state == STATE_PAM_WRONG)

return;

if (skip_without_validation()) {

clear_input();

return;

}

password[input_position] = '\0';

unlock_state = STATE_KEY_PRESSED;

redraw_screen();

input_done();

skip_repeated_empty_password = true;

return;

default:

skip_repeated_empty_password = false;

}

switch (ksym) {

case XKB_KEY_u:

case XKB_KEY_Escape:

if ((ksym == XKB_KEY_u && ctrl) ||

ksym == XKB_KEY_Escape) {

DEBUG("C-u pressed\n");

clear_input();

/* Hide the unlock indicator after a bit if the password buffer is

* empty. */

if (unlock_indicator) {

START_TIMER(clear_indicator_timeout, 1.0, clear_indicator_cb);

unlock_state = STATE_BACKSPACE_ACTIVE;

redraw_screen();

unlock_state = STATE_KEY_PRESSED;

}

return;

}

break;

case XKB_KEY_Delete:

case XKB_KEY_KP_Delete:

/* Deleting forward doesn’t make sense, as i3lock doesn’t allow you

* to move the cursor when entering a password. We need to eat this

* key press so that it won’t be treated as part of the password,

* see issue #50. */

return;

case XKB_KEY_h:

case XKB_KEY_BackSpace:

if (ksym == XKB_KEY_h && !ctrl)

break;

if (input_position == 0)

return;

/* decrement input_position to point to the previous glyph */

u8_dec(password, &input_position);

password[input_position] = '\0';

/* Hide the unlock indicator after a bit if the password buffer is

* empty. */

START_TIMER(clear_indicator_timeout, 1.0, clear_indicator_cb);

unlock_state = STATE_BACKSPACE_ACTIVE;

redraw_screen();

unlock_state = STATE_KEY_PRESSED;

return;

}

if ((input_position + 8) >= sizeof(password))

return;

#if 0

/* FIXME: handle all of these? */

printf("is_keypad_key = %d\n", xcb_is_keypad_key(sym));

printf("is_private_keypad_key = %d\n", xcb_is_private_keypad_key(sym));

printf("xcb_is_cursor_key = %d\n", xcb_is_cursor_key(sym));

printf("xcb_is_pf_key = %d\n", xcb_is_pf_key(sym));

printf("xcb_is_function_key = %d\n", xcb_is_function_key(sym));

printf("xcb_is_misc_function_key = %d\n", xcb_is_misc_function_key(sym));

printf("xcb_is_modifier_key = %d\n", xcb_is_modifier_key(sym));

#endif

if (n < 2)

return;

/* store it in the password array as UTF-8 */

memcpy(password + input_position, buffer, n - 1);

input_position += n - 1;

DEBUG("current password = %.*s\n", input_position, password);

if (unlock_indicator) {

unlock_state = STATE_KEY_ACTIVE;

redraw_screen();

unlock_state = STATE_KEY_PRESSED;

struct ev_timer *timeout = NULL;

START_TIMER(timeout, TSTAMP_N_SECS(0.25), redraw_timeout);

STOP_TIMER(clear_indicator_timeout);

}

START_TIMER(discard_passwd_timeout, TSTAMP_N_MINS(3), discard_passwd_cb);

}

/*

* A visibility notify event will be received when the visibility (= can the

* user view the complete window) changes, so for example when a popup overlays

* some area of the i3lock window.

*

* In this case, we raise our window on top so that the popup (or whatever is

* hiding us) gets hidden.

*

*/

static void handle_visibility_notify(xcb_connection_t *conn,

xcb_visibility_notify_event_t *event) {

if (event->state != XCB_VISIBILITY_UNOBSCURED) {

uint32_t values[] = {XCB_STACK_MODE_ABOVE};

xcb_configure_window(conn, event->window, XCB_CONFIG_WINDOW_STACK_MODE, values);

xcb_flush(conn);

}

}

/*

* Called when the keyboard mapping changes. We update our symbols.

*

* We ignore errors — if the new keymap cannot be loaded it’s better if the

* screen stays locked and the user intervenes by using killall i3lock.

*

*/

static void process_xkb_event(xcb_generic_event_t *gevent) {

union xkb_event {

} *event = (union xkb_event *)gevent;

DEBUG("process_xkb_event for device %d\n", event->any.deviceID);

if (event->any.deviceID != xkb_x11_get_core_keyboard_device_id(conn))

return;

/*

* XkbNewKkdNotify and XkbMapNotify together capture all sorts of keymap

* updates (e.g. xmodmap, xkbcomp, setxkbmap), with minimal redundent

* recompilations.

*/

switch (event->any.xkbType) {

case XCB_XKB_NEW_KEYBOARD_NOTIFY:

if (event->new_keyboard_notify.changed & XCB_XKB_NKN_DETAIL_KEYCODES)

(void)load_keymap();

break;

case XCB_XKB_MAP_NOTIFY:

(void)load_keymap();

break;

case XCB_XKB_STATE_NOTIFY:

xkb_state_update_mask(xkb_state,

event->state_notify.baseMods,

event->state_notify.latchedMods,

event->state_notify.lockedMods,

event->state_notify.baseGroup,

event->state_notify.latchedGroup,

event->state_notify.lockedGroup);

break;

}

}

/*

* Called when the properties on the root window change, e.g. when the screen

* resolution changes. If so we update the window to cover the whole screen

* and also redraw the image, if any.

*

*/

void handle_screen_resize(void) {

xcb_get_geometry_cookie_t geomc;

xcb_get_geometry_reply_t *geom;

geomc = xcb_get_geometry(conn, screen->root);

if ((geom = xcb_get_geometry_reply(conn, geomc, 0)) == NULL)

return;

if (last_resolution[0] == geom->width &&

last_resolution[1] == geom->height) {

free(geom);

return;

}

last_resolution[0] = geom->width;

last_resolution[1] = geom->height;

free(geom);

redraw_screen();

uint32_t mask = XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;

xcb_configure_window(conn, win, mask, last_resolution);

xcb_flush(conn);

xinerama_query_screens();

redraw_screen();

}

/*

* Callback function for PAM. We only react on password request callbacks.

*

*/

static int conv_callback(int num_msg, const struct pam_message **msg,

struct pam_response **resp, void *appdata_ptr) {

if (num_msg == 0)

return 1;

/* PAM expects an array of responses, one for each message */

if ((*resp = calloc(num_msg, sizeof(struct pam_response))) == NULL) {

perror("calloc");

return 1;

}

for (int c = 0; c < num_msg; c++) {

if (msg[c]->msg_style != PAM_PROMPT_ECHO_OFF &&

msg[c]->msg_style != PAM_PROMPT_ECHO_ON)

continue;

/* return code is currently not used but should be set to zero */

resp[c]->resp_retcode = 0;

if ((resp[c]->resp = strdup(password)) == NULL) {

perror("strdup");

return 1;

}

}

return 0;

}

/*

* This callback is only a dummy, see xcb_prepare_cb and xcb_check_cb.

* See also man libev(3): "ev_prepare" and "ev_check" - customise your event loop

*

*/

static void xcb_got_event(EV_P_ struct ev_io *w, int revents) {

/* empty, because xcb_prepare_cb and xcb_check_cb are used */

}

/*

* Flush before blocking (and waiting for new events)

*

*/

static void xcb_prepare_cb(EV_P_ ev_prepare *w, int revents) {

xcb_flush(conn);

}

/*

* Instead of polling the X connection socket we leave this to

* xcb_poll_for_event() which knows better than we can ever know.

*

*/

static void xcb_check_cb(EV_P_ ev_check *w, int revents) {

xcb_generic_event_t *event;

if (xcb_connection_has_error(conn))

errx(EXIT_FAILURE, "X11 connection broke, did your server terminate?\n");

while ((event = xcb_poll_for_event(conn)) != NULL) {

if (event->response_type == 0) {

xcb_generic_error_t *error = (xcb_generic_error_t *)event;

if (debug_mode)

fprintf(stderr, "X11 Error received! sequence 0x%x, error_code = %d\n",

error->sequence, error->error_code);

free(event);

continue;

}

/* Strip off the highest bit (set if the event is generated) */

int type = (event->response_type & 0x7F);

switch (type) {

case XCB_KEY_PRESS:

handle_key_press((xcb_key_press_event_t *)event);

break;

case XCB_VISIBILITY_NOTIFY:

handle_visibility_notify(conn, (xcb_visibility_notify_event_t *)event);

break;

case XCB_MAP_NOTIFY:

if (!dont_fork) {

/* After the first MapNotify, we never fork again. We don’t

* expect to get another MapNotify, but better be sure… */

dont_fork = true;

/* In the parent process, we exit */

if (fork() != 0)

exit(0);

ev_loop_fork(EV_DEFAULT);

}

break;

case XCB_CONFIGURE_NOTIFY:

handle_screen_resize();

break;

default:

if (type == xkb_base_event)

process_xkb_event(event);

}

free(event);

}

}

/*

* This function is called from a fork()ed child and will raise the i3lock

* window when the window is obscured, even when the main i3lock process is

* blocked due to PAM.

*

*/

static void raise_loop(xcb_window_t window) {

xcb_connection_t *conn;

xcb_generic_event_t *event;

int screens;

if ((conn = xcb_connect(NULL, &screens)) == NULL ||

xcb_connection_has_error(conn))

errx(EXIT_FAILURE, "Cannot open display\n");

/* We need to know about the window being obscured or getting destroyed. */

xcb_change_window_attributes(conn, window, XCB_CW_EVENT_MASK,

(uint32_t[]){

XCB_EVENT_MASK_VISIBILITY_CHANGE |

XCB_EVENT_MASK_STRUCTURE_NOTIFY});

xcb_flush(conn);

DEBUG("Watching window 0x%08x\n", window);

while ((event = xcb_wait_for_event(conn)) != NULL) {

if (event->response_type == 0) {

xcb_generic_error_t *error = (xcb_generic_error_t *)event;

DEBUG("X11 Error received! sequence 0x%x, error_code = %d\n",

error->sequence, error->error_code);

free(event);

continue;

}

/* Strip off the highest bit (set if the event is generated) */

int type = (event->response_type & 0x7F);

DEBUG("Read event of type %d\n", type);

switch (type) {

case XCB_VISIBILITY_NOTIFY:

handle_visibility_notify(conn, (xcb_visibility_notify_event_t *)event);

break;

case XCB_UNMAP_NOTIFY:

DEBUG("UnmapNotify for 0x%08x\n", (((xcb_unmap_notify_event_t *)event)->window));

if (((xcb_unmap_notify_event_t *)event)->window == window)

exit(EXIT_SUCCESS);

break;

case XCB_DESTROY_NOTIFY:

DEBUG("DestroyNotify for 0x%08x\n", (((xcb_destroy_notify_event_t *)event)->window));

if (((xcb_destroy_notify_event_t *)event)->window == window)

exit(EXIT_SUCCESS);

break;

default:

DEBUG("Unhandled event type %d\n", type);

break;

}

free(event);

}

}

int main(int argc, char *argv[]) {

struct passwd *pw;

char *username;

char *image_path = NULL;

int ret;

struct pam_conv conv = {conv_callback, NULL};

int curs_choice = CURS_NONE;

int o;

int optind = 0;

struct option longopts[] = {

{"version", no_argument, NULL, 'v'},

{"nofork", no_argument, NULL, 'n'},

{"beep", no_argument, NULL, 'b'},

{"dpms", no_argument, NULL, 'd'},

{"color", required_argument, NULL, 'c'},

{"pointer", required_argument, NULL, 'p'},

{"debug", no_argument, NULL, 0},

{"help", no_argument, NULL, 'h'},

{"no-unlock-indicator", no_argument, NULL, 'u'},

{"image", required_argument, NULL, 'i'},

{"tiling", no_argument, NULL, 't'},

{"ignore-empty-password", no_argument, NULL, 'e'},

{"inactivity-timeout", required_argument, NULL, 'I'},

{"show-failed-attempts", no_argument, NULL, 'f'},

{NULL, no_argument, NULL, 0}};

if ((pw = getpwuid(getuid())) == NULL)

err(EXIT_FAILURE, "getpwuid() failed");

if ((username = pw->pw_name) == NULL)

errx(EXIT_FAILURE, "pw->pw_name is NULL.\n");

char *optstring = "hvnbdc:p:ui:teI:f";

while ((o = getopt_long(argc, argv, optstring, longopts, &optind)) != -1) {

switch (o) {

case 'v':

errx(EXIT_SUCCESS, "version " VERSION " © 2010 Michael Stapelberg");

case 'n':

dont_fork = true;

break;

case 'b':

beep = true;

break;

case 'd':

fprintf(stderr, "DPMS support has been removed from i3lock. Please see the manpage i3lock(1).\n");

break;

case 'I': {

int time = 0;

if (sscanf(optarg, "%d", &time) != 1 || time < 0)

errx(EXIT_FAILURE, "invalid timeout, it must be a positive integer\n");

inactivity_timeout = time;

break;

}

case 'c': {

char *arg = optarg;

/* Skip # if present */

if (arg[0] == '#')

arg++;

if (strlen(arg) != 6 || sscanf(arg, "%06[0-9a-fA-F]", color) != 1)

errx(EXIT_FAILURE, "color is invalid, it must be given in 3-byte hexadecimal format: rrggbb\n");

break;

}

case 'u':

unlock_indicator = false;

break;

case 'i':

image_path = strdup(optarg);

break;

case 't':

tile = true;

break;

case 'p':

if (!strcmp(optarg, "win")) {

curs_choice = CURS_WIN;

} else if (!strcmp(optarg, "default")) {

curs_choice = CURS_DEFAULT;

} else {

errx(EXIT_FAILURE, "i3lock: Invalid pointer type given. Expected one of \"win\" or \"default\".\n");

}

break;

case 'e':

ignore_empty_password = true;

break;

case 0:

if (strcmp(longopts[optind].name, "debug") == 0)

debug_mode = true;

break;

case 'f':

show_failed_attempts = true;

break;

default:

errx(EXIT_FAILURE, "Syntax: i3lock [-v] [-n] [-b] [-d] [-c color] [-u] [-p win|default]"

" [-i image.png] [-t] [-e] [-I timeout] [-f]");

}

}

/* We need (relatively) random numbers for highlighting a random part of

* the unlock indicator upon keypresses. */

srand(time(NULL));

/* Initialize PAM */

if ((ret = pam_start("i3lock", username, &conv, &pam_handle)) != PAM_SUCCESS)

errx(EXIT_FAILURE, "PAM: %s", pam_strerror(pam_handle, ret));

if ((ret = pam_set_item(pam_handle, PAM_TTY, getenv("DISPLAY"))) != PAM_SUCCESS)

errx(EXIT_FAILURE, "PAM: %s", pam_strerror(pam_handle, ret));

/* Using mlock() as non-super-user seems only possible in Linux. Users of other

* operating systems should use encrypted swap/no swap (or remove the ifdef and

* run i3lock as super-user). */

#if defined(__linux__)

/* Lock the area where we store the password in memory, we don’t want it to

* be swapped to disk. Since Linux 2.6.9, this does not require any

* privileges, just enough bytes in the RLIMIT_MEMLOCK limit. */

if (mlock(password, sizeof(password)) != 0)

err(EXIT_FAILURE, "Could not lock page in memory, check RLIMIT_MEMLOCK");

#endif

/* Double checking that connection is good and operatable with xcb */

int screennr;

if ((conn = xcb_connect(NULL, &screennr)) == NULL ||

xcb_connection_has_error(conn))

errx(EXIT_FAILURE, "Could not connect to X11, maybe you need to set DISPLAY?");

if (xkb_x11_setup_xkb_extension(conn,

XKB_X11_MIN_MAJOR_XKB_VERSION,

XKB_X11_MIN_MINOR_XKB_VERSION,

0,

NULL,

NULL,

&xkb_base_event,

&xkb_base_error) != 1)

errx(EXIT_FAILURE, "Could not setup XKB extension.");

static const xcb_xkb_map_part_t required_map_parts =

(XCB_XKB_MAP_PART_KEY_TYPES |

XCB_XKB_MAP_PART_KEY_SYMS |

XCB_XKB_MAP_PART_MODIFIER_MAP |

XCB_XKB_MAP_PART_EXPLICIT_COMPONENTS |

XCB_XKB_MAP_PART_KEY_ACTIONS |

XCB_XKB_MAP_PART_VIRTUAL_MODS |

XCB_XKB_MAP_PART_VIRTUAL_MOD_MAP);

static const xcb_xkb_event_type_t required_events =

(XCB_XKB_EVENT_TYPE_NEW_KEYBOARD_NOTIFY |

XCB_XKB_EVENT_TYPE_MAP_NOTIFY |

XCB_XKB_EVENT_TYPE_STATE_NOTIFY);

xcb_xkb_select_events(

conn,

xkb_x11_get_core_keyboard_device_id(conn),

required_events,

0,

required_events,

required_map_parts,

required_map_parts,

0);

/* When we cannot initially load the keymap, we better exit */

if (!load_keymap())

errx(EXIT_FAILURE, "Could not load keymap");

const char *locale = getenv("LC_ALL");

if (!locale)

locale = getenv("LC_CTYPE");

if (!locale)

locale = getenv("LANG");

if (!locale) {

if (debug_mode)

fprintf(stderr, "Can't detect your locale, fallback to C\n");

locale = "C";

}

load_compose_table(locale);

xinerama_init();

xinerama_query_screens();

screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;

last_resolution[0] = screen->width_in_pixels;

last_resolution[1] = screen->height_in_pixels;

xcb_change_window_attributes(conn, screen->root, XCB_CW_EVENT_MASK,

(uint32_t[]){XCB_EVENT_MASK_STRUCTURE_NOTIFY});

if (image_path) {

IMG_Init(IMG_INIT_TIF);

sdl_surface = IMG_Load(image_path);

/* Create a pixmap to render on, fill it with the background color */

img = cairo_image_surface_create_for_data(

(unsigned char*)sdl_surface->pixels,

CAIRO_FORMAT_RGB24,

sdl_surface->w,

sdl_surface->h,

sdl_surface->pitch);

/* In case loading failed, we just pretend no -i was specified. */

if (cairo_surface_status(img) != CAIRO_STATUS_SUCCESS) {

fprintf(stderr, "Could not load image \"%s\": %s\n",

image_path, cairo_status_to_string(cairo_surface_status(img)));

img = NULL;

}

}

/* Pixmap on which the image is rendered to (if any) */

xcb_pixmap_t bg_pixmap = draw_image(last_resolution);

/* open the fullscreen window, already with the correct pixmap in place */

win = open_fullscreen_window(conn, screen, color, bg_pixmap);

xcb_free_pixmap(conn, bg_pixmap);

pid_t pid = fork();

/* The pid == -1 case is intentionally ignored here:

* While the child process is useful for preventing other windows from

* popping up while i3lock blocks, it is not critical. */

if (pid == 0) {

/* Child */

close(xcb_get_file_descriptor(conn));

raise_loop(win);

exit(EXIT_SUCCESS);

}

cursor = create_cursor(conn, screen, win, curs_choice);

grab_pointer_and_keyboard(conn, screen, cursor);

/* Load the keymap again to sync the current modifier state. Since we first

* loaded the keymap, there might have been changes, but starting from now,

* we should get all key presses/releases due to having grabbed the

* keyboard. */

(void)load_keymap();

/* Initialize the libev event loop. */

main_loop = EV_DEFAULT;

if (main_loop == NULL)

errx(EXIT_FAILURE, "Could not initialize libev. Bad LIBEV_FLAGS?\n");

struct ev_io *xcb_watcher = calloc(sizeof(struct ev_io), 1);

struct ev_check *xcb_check = calloc(sizeof(struct ev_check), 1);

struct ev_prepare *xcb_prepare = calloc(sizeof(struct ev_prepare), 1);

ev_io_init(xcb_watcher, xcb_got_event, xcb_get_file_descriptor(conn), EV_READ);

ev_io_start(main_loop, xcb_watcher);

ev_check_init(xcb_check, xcb_check_cb);

ev_check_start(main_loop, xcb_check);

ev_prepare_init(xcb_prepare, xcb_prepare_cb);

ev_prepare_start(main_loop, xcb_prepare);

/* Invoke the event callback once to catch all the events which were

* received up until now. ev will only pick up new events (when the X11