147 lines
3.6 KiB
C
147 lines
3.6 KiB
C
/**
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* Copyright 2021 Johannes Marbach
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*
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* This file is part of unl0kr, hereafter referred to as the program.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "terminal.h"
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#include "log.h"
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#include <fcntl.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <linux/kd.h>
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#include <sys/ioctl.h>
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/**
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* Static variables
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*/
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static int current_fd = -1;
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static int original_mode = -1;
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static int original_kb_mode = -1;
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/**
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* Static prototypes
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*/
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/**
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* Close the current file descriptor and reopen /dev/tty0.
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*
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* @return true if opening was successful, false otherwise
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*/
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static bool reopen_current_terminal(void);
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/**
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* Close the current file descriptor.
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*/
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static void close_current_terminal(void);
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/**
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* Static functions
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*/
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static bool reopen_current_terminal(void) {
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close_current_terminal();
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current_fd = open("/dev/tty0", O_RDWR);
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if (current_fd < 0) {
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ul_log(UL_LOG_LEVEL_WARNING, "Could not open /dev/tty0");
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return false;
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}
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return true;
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}
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static void close_current_terminal(void) {
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if (current_fd < 0) {
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return;
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}
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close(current_fd);
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current_fd = -1;
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}
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/**
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* Public functions
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*/
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void ul_terminal_prepare_current_terminal(bool enable_graphics_mode, bool disable_keyboard_input) {
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/* Exit early if there is nothing to do */
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if (!enable_graphics_mode && !disable_keyboard_input) {
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return;
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}
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/* Reopen the current terminal */
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reopen_current_terminal();
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if (current_fd < 0) {
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ul_log(UL_LOG_LEVEL_WARNING, "Could not prepare current terminal");
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return;
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}
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/* Disable terminal keyboard input (hides entered text) */
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if (disable_keyboard_input) {
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if (ioctl(current_fd, KDGKBMODE, &original_kb_mode) != 0) {
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ul_log(UL_LOG_LEVEL_WARNING, "Could not get terminal keyboard mode");
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}
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if (ioctl(current_fd, KDSKBMODE, K_OFF) != 0) {
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ul_log(UL_LOG_LEVEL_WARNING, "Could not set terminal keyboard mode to off");
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}
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}
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/* Switch terminal into graphics mode (hides command prompt) */
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if (enable_graphics_mode) {
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if (ioctl(current_fd, KDGETMODE, &original_mode) != 0) {
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ul_log(UL_LOG_LEVEL_WARNING, "Could not get terminal mode");
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}
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if (ioctl(current_fd, KDSETMODE, KD_GRAPHICS) != 0) {
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ul_log(UL_LOG_LEVEL_WARNING, "Could not set terminal mode to graphics");
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}
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}
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}
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void ul_terminal_reset_current_terminal(void) {
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/* If we haven't previously opened the current terminal, exit */
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if (current_fd < 0) {
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ul_log(UL_LOG_LEVEL_WARNING, "Could not reset current terminal");
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return;
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}
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/* Reset terminal mode if needed */
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if (original_mode >= 0 && ioctl(current_fd, KDSETMODE, original_mode) != 0) {
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ul_log(UL_LOG_LEVEL_WARNING, "Could not reset terminal mode");
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}
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/* Reset terminal keyboard mode if needed */
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if (original_kb_mode >= 0 && ioctl(current_fd, KDSKBMODE, original_kb_mode) != 0) {
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ul_log(UL_LOG_LEVEL_WARNING, "Could not reset terminal keyboard mode");
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}
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close_current_terminal();
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}
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