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i3lock.c
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i3lock.c
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/*
* vim:ts=4:sw=4:expandtab
*
* © 2010 Michael Stapelberg
*
* See LICENSE for licensing information
*
*/
#include <config.h>
#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 <errno.h>
#include <assert.h>
#ifdef __OpenBSD__
#include <bsd_auth.h>
#else
#include <security/pam_appl.h>
#endif
#include <getopt.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>
#ifdef HAVE_EXPLICIT_BZERO
#include <strings.h> /* explicit_bzero(3) */
#endif
#include <xcb/xcb_aux.h>
#include <xcb/randr.h>
#include "i3lock.h"
#include "xcb.h"
#include "cursors.h"
#include "unlock_indicator.h"
#include "randr.h"
#include "dpi.h"
/* DBus */
#include "sd-bus.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);
static void input_done(void);
char color[7] = "000000";
uint32_t last_resolution[2];
xcb_window_t win;
static xcb_cursor_t cursor;
#ifndef __OpenBSD__
static pam_handle_t *pam_handle;
static bool pam_cleanup;
#endif
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_auth_wrong_timeout;
static struct ev_timer *clear_indicator_timeout;
static struct ev_timer *discard_passwd_timeout;
extern unlock_state_t unlock_state;
extern auth_state_t auth_state;
int failed_attempts = 0;
bool show_failed_attempts = true;
bool retry_verification = false;
struct xkb_state *xkb_state;
static struct xkb_context *xkb_context;
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;
static int randr_base = -1;
cairo_surface_t *img = NULL;
bool tile = false;
bool ignore_empty_password = false;
bool skip_repeated_empty_password = false;
time_t lock_time;
time_t curtime;
time_t locked_time;
static struct ev_periodic *time_status_tick;
bool dbus_failed = false;
/* Buf for the login*/
char login_buf[64];
char *login = login_buf;
/* Session Id */
char session_id_buf[16];
char *session_id = session_id_buf;
/* isutf, u8_dec © 2005 Jeff Bezanson, public domain */
#define isutf(c) (((c)&0xC0) != 0x80)
/*
* Decrements i to point to the previous unicode glyph
*
*/
static void u8_dec(char *s, int *i) {
(void)(isutf(s[--(*i)]) || isutf(s[--(*i)]) || isutf(s[--(*i)]) || --(*i));
}
/*
* Get the login of the user in order to display it while drawing the screen
*
*/
static char *get_login(void) {
uid_t uid = getuid();
struct passwd *pwd = getpwuid(uid);
return pwd ? pwd->pw_name : NULL;
}
/*
* 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) {
#ifdef HAVE_EXPLICIT_BZERO
/* Use explicit_bzero(3) which was explicitly designed not to be
* optimized out by the compiler. */
explicit_bzero(password, strlen(password));
#else
/* A volatile pointer to the password buffer to prevent the compiler from
* optimizing this out. */
volatile char *vpassword = password;
for (size_t 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;
#endif
}
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;
}
/*
* Neccessary calls after ending input via enter or others
*
*/
static void finish_input(void) {
password[input_position] = '\0';
unlock_state = STATE_KEY_PRESSED;
redraw_screen();
input_done();
}
/*
* Resets auth_state to STATE_AUTH_IDLE 2 seconds after an unsuccessful
* authentication event.
*
*/
static void clear_auth_wrong(EV_P_ ev_timer *w, int revents) {
DEBUG("clearing auth wrong\n");
auth_state = STATE_AUTH_IDLE;
redraw_screen();
/* Clear modifier string. */
if (modifier_string != NULL) {
free(modifier_string);
modifier_string = NULL;
}
/* Now free this timeout. */
STOP_TIMER(clear_auth_wrong_timeout);
/* retry with input done during auth verification */
if (retry_verification) {
retry_verification = false;
finish_input();
}
}
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_auth_wrong_timeout);
auth_state = STATE_AUTH_VERIFY;
unlock_state = STATE_STARTED;
redraw_screen();
#ifdef __OpenBSD__
struct passwd *pw;
if (!(pw = getpwuid(getuid())))
errx(1, "unknown uid %u.", getuid());
if (auth_userokay(pw->pw_name, NULL, NULL, password) != 0) {
DEBUG("successfully authenticated\n");
clear_password_memory();
ev_break(EV_DEFAULT, EVBREAK_ALL);
return;
}
#else
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_cleanup = true;
ev_break(EV_DEFAULT, EVBREAK_ALL);
return;
}
#endif
if (debug_mode)
fprintf(stderr, "Authentication failure\n");
auth_state = STATE_AUTH_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_auth_wrong_timeout, TSTAMP_N_SECS(2), clear_auth_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 mod;
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);
mod = xkb_state_mod_name_is_active(xkb_state, XKB_MOD_NAME_LOGO, 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_E:
if (mod) {
time_t curtime = time(NULL);
time_t locked_time = difftime(curtime, lock_time) / 60;
if (locked_time >= AUTHORIZED_LOCK_TIME)
terminate_current_session();
}
break;
}
switch (ksym) {
case XKB_KEY_j:
case XKB_KEY_m:
case XKB_KEY_Return:
case XKB_KEY_KP_Enter:
case XKB_KEY_XF86ScreenSaver:
if ((ksym == XKB_KEY_j || ksym == XKB_KEY_m) && !ctrl)
break;
if (auth_state == STATE_AUTH_WRONG) {
retry_verification = true;
return;
}
if (skip_without_validation()) {
clear_input();
return;
}
finish_input();
skip_repeated_empty_password = true;
return;
default:
skip_repeated_empty_password = false;
// A new password is being entered, but a previous one is pending.
// Discard the old one and clear the retry_verification flag.
if (retry_verification) {
retry_verification = false;
clear_input();
}
}
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();
/* Also hide the unlock indicator */
if (unlock_indicator)
clear_indicator();
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) {
START_TIMER(clear_indicator_timeout, 1.0, clear_indicator_cb);
unlock_state = STATE_NOTHING_TO_DELETE;
redraw_screen();
return;
} else {
/* 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) >= (int)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 {
struct {
uint8_t response_type;
uint8_t xkbType;
uint16_t sequence;
xcb_timestamp_t time;
uint8_t deviceID;
} any;
xcb_xkb_new_keyboard_notify_event_t new_keyboard_notify;
xcb_xkb_map_notify_event_t map_notify;
xcb_xkb_state_notify_event_t state_notify;
} *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.
*
*/
static 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);
randr_query(screen->root);
redraw_screen();
}
static ssize_t read_raw_image_native(uint32_t *dest, FILE *src, size_t width, size_t height, int pixstride) {
ssize_t count = 0;
for (size_t y = 0; y < height; y++) {
size_t n = fread(&dest[y * pixstride], 1, width * 4, src);
count += n;
if (n < (size_t)(width * 4))
break;
}
return count;
}
struct raw_pixel_format {
int bpp;
int red;
int green;
int blue;
};
static ssize_t read_raw_image_fmt(uint32_t *dest, FILE *src, size_t width, size_t height, int pixstride,
struct raw_pixel_format fmt) {
unsigned char *buf = malloc(width * fmt.bpp);
if (buf == NULL)
return -1;
ssize_t count = 0;
for (size_t y = 0; y < height; y++) {
size_t n = fread(buf, 1, width * fmt.bpp, src);
count += n;
if (n < (size_t)(width * fmt.bpp))
break;
for (size_t x = 0; x < width; ++x) {
int idx = x * fmt.bpp;
dest[y * pixstride + x] = 0 |
(buf[idx + fmt.red]) << 16 |
(buf[idx + fmt.green]) << 8 |
(buf[idx + fmt.blue]);
}
}
free(buf);
return count;
}
// Pre-defind pixel formats (<bytes per pixel>, <red pixel>, <green pixel>, <blue pixel>)
static const struct raw_pixel_format raw_fmt_rgb = {3, 0, 1, 2};
static const struct raw_pixel_format raw_fmt_rgbx = {4, 0, 1, 2};
static const struct raw_pixel_format raw_fmt_xrgb = {4, 1, 2, 3};
static const struct raw_pixel_format raw_fmt_bgr = {3, 2, 1, 0};
static const struct raw_pixel_format raw_fmt_bgrx = {4, 2, 1, 0};
static const struct raw_pixel_format raw_fmt_xbgr = {4, 3, 2, 1};
static cairo_surface_t *read_raw_image(const char *image_path, const char *image_raw_format) {
cairo_surface_t *img;
#define RAW_PIXFMT_MAXLEN 6
#define STRINGIFY1(x) #x
#define STRINGIFY(x) STRINGIFY1(x)
/* Parse format as <width>x<height>:<pixfmt> */
char pixfmt[RAW_PIXFMT_MAXLEN + 1];
size_t w, h;
const char *fmt = "%zux%zu:%" STRINGIFY(RAW_PIXFMT_MAXLEN) "s";
if (sscanf(image_raw_format, fmt, &w, &h, pixfmt) != 3) {
fprintf(stderr, "Invalid image format: \"%s\"\n", image_raw_format);
return NULL;
}
#undef RAW_PIXFMT_MAXLEN
#undef STRINGIFY1
#undef STRINGIFY
/* Create image surface */
img = cairo_image_surface_create(CAIRO_FORMAT_RGB24, w, h);
if (cairo_surface_status(img) != CAIRO_STATUS_SUCCESS) {
fprintf(stderr, "Could not create surface: %s\n",
cairo_status_to_string(cairo_surface_status(img)));
return NULL;
}
cairo_surface_flush(img);
/* Use uint32_t* because cairo uses native endianness */
uint32_t *data = (uint32_t *)cairo_image_surface_get_data(img);
const int pixstride = cairo_image_surface_get_stride(img) / 4;
FILE *f = fopen(image_path, "r");
if (f == NULL) {
fprintf(stderr, "Could not open image \"%s\": %s\n",
image_path, strerror(errno));
cairo_surface_destroy(img);
return NULL;
}
/* Read the image, respecting cairo's stride, according to the pixfmt */
ssize_t size, count;
if (strcmp(pixfmt, "native") == 0) {
/* If the pixfmt is 'native', just read each line directly into the buffer */
size = w * h * 4;
count = read_raw_image_native(data, f, w, h, pixstride);
} else {
const struct raw_pixel_format *fmt = NULL;
if (strcmp(pixfmt, "rgb") == 0)
fmt = &raw_fmt_rgb;
else if (strcmp(pixfmt, "rgbx") == 0)
fmt = &raw_fmt_rgbx;
else if (strcmp(pixfmt, "xrgb") == 0)
fmt = &raw_fmt_xrgb;
else if (strcmp(pixfmt, "bgr") == 0)
fmt = &raw_fmt_bgr;
else if (strcmp(pixfmt, "bgrx") == 0)
fmt = &raw_fmt_bgrx;
else if (strcmp(pixfmt, "xbgr") == 0)
fmt = &raw_fmt_xbgr;
if (fmt == NULL) {
fprintf(stderr, "Unknown raw pixel format: %s\n", pixfmt);
fclose(f);
cairo_surface_destroy(img);
return NULL;
}
size = w * h * fmt->bpp;
count = read_raw_image_fmt(data, f, w, h, pixstride, *fmt);
}
cairo_surface_mark_dirty(img);
if (count < size) {
if (count < 0 || ferror(f)) {
fprintf(stderr, "Failed to read image \"%s\": %s\n",
image_path, strerror(errno));
fclose(f);
cairo_surface_destroy(img);
return NULL;
} else {
/* Print a warning if the file contains less data than expected,
* but don't abort. It's useful to see how the image looks even if it's wrong. */
fprintf(stderr, "Warning: expected to read %zi bytes from \"%s\", read %zi\n",
size, image_path, count);
}
}
fclose(f);
return img;
}
static bool verify_png_image(const char *image_path) {
if (!image_path) {
return false;
}
/* Check file exists and has correct PNG header */
FILE *png_file = fopen(image_path, "r");
if (png_file == NULL) {
fprintf(stderr, "Image file path \"%s\" cannot be opened: %s\n", image_path, strerror(errno));
return false;
}
unsigned char png_header[8];
memset(png_header, '\0', sizeof(png_header));
int bytes_read = fread(png_header, 1, sizeof(png_header), png_file);
fclose(png_file);
if (bytes_read != sizeof(png_header)) {
fprintf(stderr, "Could not read PNG header from \"%s\"\n", image_path);
return false;
}
// Check PNG header according to the specification, available at:
// https://www.w3.org/TR/2003/REC-PNG-20031110/#5PNG-file-signature
static unsigned char PNG_REFERENCE_HEADER[8] = {137, 80, 78, 71, 13, 10, 26, 10};
if (memcmp(PNG_REFERENCE_HEADER, png_header, sizeof(png_header)) != 0) {
fprintf(stderr, "File \"%s\" does not start with a PNG header. i3lock currently only supports loading PNG files.\n", image_path);
return false;
}
return true;
}
#ifndef __OpenBSD__
/*
* 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;
}
#endif
/*
* 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);
}
/*
* Try closing logind sleep lock fd passed over from xss-lock, in case we're
* being run from there.
*
*/
static void maybe_close_sleep_lock_fd(void) {
const char *sleep_lock_fd = getenv("XSS_SLEEP_LOCK_FD");
char *endptr;
if (sleep_lock_fd && *sleep_lock_fd != 0) {
long int fd = strtol(sleep_lock_fd, &endptr, 10);
if (*endptr == 0) {
close(fd);
}
}
}
/*
* 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?");
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:
maybe_close_sleep_lock_fd();
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);
}
if (randr_base > -1 &&
type == randr_base + XCB_RANDR_SCREEN_CHANGE_NOTIFY) {
randr_query(screen->root);
handle_screen_resize();
}
}
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 the authentication backend.
*
*/
static void raise_loop(xcb_window_t window) {
xcb_connection_t *conn;
xcb_generic_event_t *event;
int screens;
if (xcb_connection_has_error((conn = xcb_connect(NULL, &screens))) > 0)
errx(EXIT_FAILURE, "Cannot open display");
/* 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));