/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2010 Kay Sievers

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <ctype.h>
#include <stdbool.h>
#include <stdarg.h>
#include <limits.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <linux/tiocl.h>
#include <linux/kd.h>
#include <linux/vt.h>

#include "util.h"
#include "log.h"
#include "macro.h"
#include "virt.h"

static bool is_vconsole(int fd) {
        unsigned char data[1];

        data[0] = TIOCL_GETFGCONSOLE;
        return ioctl(fd, TIOCLINUX, data) >= 0;
}

static int disable_utf8(int fd) {
        int r = 0, k;

        if (ioctl(fd, KDSKBMODE, K_XLATE) < 0)
                r = -errno;

        if (loop_write(fd, "\033%@", 3, false) < 0)
                r = -errno;

        k = write_one_line_file("/sys/module/vt/parameters/default_utf8", "0");
        if (k < 0)
                r = k;

        if (r < 0)
                log_warning("Failed to disable UTF-8: %s", strerror(-r));

        return r;
}

static int enable_utf8(int fd) {
        int r = 0, k;

        if (ioctl(fd, KDSKBMODE, K_UNICODE) < 0)
                r = -errno;

        if (loop_write(fd, "\033%G", 3, false) < 0)
                r = -errno;

        k = write_one_line_file("/sys/module/vt/parameters/default_utf8", "1");
        if (k < 0)
                r = k;

        if (r < 0)
                log_warning("Failed to enable UTF-8: %s", strerror(-r));

        return r;
}

static int keymap_load(const char *vc, const char *map, const char *map_toggle, bool utf8, pid_t *_pid) {
        const char *args[8];
        int i = 0;
        pid_t pid;

        if (isempty(map)) {
                /* An empty map means kernel map */
                *_pid = 0;
                return 0;
        }

        args[i++] = KBD_LOADKEYS;
        args[i++] = "-q";
        args[i++] = "-C";
        args[i++] = vc;
        if (utf8)
                args[i++] = "-u";
        args[i++] = map;
        if (map_toggle)
                args[i++] = map_toggle;
        args[i++] = NULL;

        pid = fork();
        if (pid < 0) {
                log_error("Failed to fork: %m");
                return -errno;
        } else if (pid == 0) {
                execv(args[0], (char **) args);
                _exit(EXIT_FAILURE);
        }

        *_pid = pid;
        return 0;
}

static int font_load(const char *vc, const char *font, const char *map, const char *unimap, pid_t *_pid) {
        const char *args[9];
        int i = 0;
        pid_t pid;

        if (isempty(font)) {
                /* An empty font means kernel font */
                *_pid = 0;
                return 0;
        }

        args[i++] = KBD_SETFONT;
        args[i++] = "-C";
        args[i++] = vc;
        args[i++] = font;
        if (map) {
                args[i++] = "-m";
                args[i++] = map;
        }
        if (unimap) {
                args[i++] = "-u";
                args[i++] = unimap;
        }
        args[i++] = NULL;

        pid = fork();
        if (pid < 0) {
                log_error("Failed to fork: %m");
                return -errno;
        } else if (pid == 0) {
                execv(args[0], (char **) args);
                _exit(EXIT_FAILURE);
        }

        *_pid = pid;
        return 0;
}

static void font_copy_to_all_vts(int fd, int from_vt) {
        struct vt_stat vts;
        unsigned short bits;
        int i;
        int r;

        /* get 16 bit mask of used VT numbers */
        zero(vts);
        r = ioctl(fd, VT_GETSTATE, &vts);
        if (r < 0)
                return;

        bits = vts.v_state;
        for (i = 1; i <= 16; i++) {
                char vtname[16];
                int vtfd;
                struct console_font_op cfo;
                bool used;

                /* skip unused VTs */
                used = bits & 1;
                bits >>= 1;
                if (!used)
                        continue;

                if (i == from_vt)
                        continue;

                snprintf(vtname , sizeof(vtname), "/dev/tty%i", i);
                vtfd = open_terminal(vtname, O_RDWR|O_CLOEXEC);
                if (vtfd < 0)
                        continue;

                /* copy font from from_vt to this VT */
                zero(cfo);
                cfo.op = KD_FONT_OP_COPY;
                /* the index numbers seem to start at 0 for tty1 */
                cfo.height = from_vt - 1;
                ioctl(vtfd, KDFONTOP, &cfo);

                close_nointr_nofail(vtfd);
        }
}

int main(int argc, char **argv) {
        const char *vc;
        char *vc_keymap = NULL;
        char *vc_keymap_toggle = NULL;
        char *vc_font = NULL;
        char *vc_font_map = NULL;
        char *vc_font_unimap = NULL;
        int fd = -1;
        bool utf8;
        pid_t font_pid = 0, keymap_pid = 0;
        int font_copy_from_vt = 0;
        int r = EXIT_FAILURE;

        log_set_target(LOG_TARGET_AUTO);
        log_parse_environment();
        log_open();

        umask(0022);

        if (argv[1])
                vc = argv[1];
        else {
                vc = "/dev/tty1";
                font_copy_from_vt = 1;
        }

        fd = open_terminal(vc, O_RDWR|O_CLOEXEC);
        if (fd < 0) {
                log_error("Failed to open %s: %m", vc);
                goto finish;
        }

        if (!is_vconsole(fd)) {
                log_error("Device %s is not a virtual console.", vc);
                goto finish;
        }

        utf8 = is_locale_utf8();

        r = 0;

        if (detect_container(NULL) <= 0) {
                r = parse_env_file("/proc/cmdline", WHITESPACE,
                                   "vconsole.keymap", &vc_keymap,
                                   "vconsole.keymap.toggle", &vc_keymap_toggle,
                                   "vconsole.font", &vc_font,
                                   "vconsole.font.map", &vc_font_map,
                                   "vconsole.font.unimap", &vc_font_unimap,
                                   NULL);

                if (r < 0 && r != -ENOENT)
                        log_warning("Failed to read /proc/cmdline: %s", strerror(-r));
        }

        /* Hmm, nothing set on the kernel cmd line? Then let's
         * try /etc/vconsole.conf */
        if (r <= 0) {
                r = parse_env_file("/etc/vconsole.conf", NEWLINE,
                                   "KEYMAP", &vc_keymap,
                                   "KEYMAP_TOGGLE", &vc_keymap_toggle,
                                   "FONT", &vc_font,
                                   "FONT_MAP", &vc_font_map,
                                   "FONT_UNIMAP", &vc_font_unimap,
                                   NULL);

                if (r < 0 && r != -ENOENT)
                        log_warning("Failed to read /etc/vconsole.conf: %s", strerror(-r));
        }

        if (utf8)
                enable_utf8(fd);
        else
                disable_utf8(fd);

        r = EXIT_FAILURE;
        if (keymap_load(vc, vc_keymap, vc_keymap_toggle, utf8, &keymap_pid) >= 0 &&
            font_load(vc, vc_font, vc_font_map, vc_font_unimap, &font_pid) >= 0)
                r = EXIT_SUCCESS;

finish:
        if (keymap_pid > 0)
                wait_for_terminate_and_warn(KBD_LOADKEYS, keymap_pid);

        if (font_pid > 0) {
                wait_for_terminate_and_warn(KBD_SETFONT, font_pid);
                if (font_copy_from_vt > 0)
                        font_copy_to_all_vts(fd, font_copy_from_vt);
        }

        free(vc_keymap);
        free(vc_font);
        free(vc_font_map);
        free(vc_font_unimap);

        if (fd >= 0)
                close_nointr_nofail(fd);

        return r;
}