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-rw-r--r--src/vconsole/vconsole-setup.c477
1 files changed, 477 insertions, 0 deletions
diff --git a/src/vconsole/vconsole-setup.c b/src/vconsole/vconsole-setup.c
new file mode 100644
index 0000000..ebdeba3
--- /dev/null
+++ b/src/vconsole/vconsole-setup.c
@@ -0,0 +1,477 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+/***
+ Copyright © 2016 Michal Soltys <soltys@ziu.info>
+***/
+
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <linux/kd.h>
+#include <linux/tiocl.h>
+#include <linux/vt.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <sysexits.h>
+#include <termios.h>
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "env-file.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "io-util.h"
+#include "locale-util.h"
+#include "log.h"
+#include "proc-cmdline.h"
+#include "process-util.h"
+#include "signal-util.h"
+#include "stdio-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "terminal-util.h"
+#include "util.h"
+#include "virt.h"
+
+static int verify_vc_device(int fd) {
+ unsigned char data[] = {
+ TIOCL_GETFGCONSOLE,
+ };
+
+ int r;
+
+ r = ioctl(fd, TIOCLINUX, data);
+ if (r < 0)
+ return -errno;
+
+ return r;
+}
+
+static int verify_vc_allocation(unsigned idx) {
+ char vcname[sizeof("/dev/vcs") + DECIMAL_STR_MAX(unsigned) - 2];
+
+ xsprintf(vcname, "/dev/vcs%u", idx);
+
+ if (access(vcname, F_OK) < 0)
+ return -errno;
+
+ return 0;
+}
+
+static int verify_vc_allocation_byfd(int fd) {
+ struct vt_stat vcs = {};
+
+ if (ioctl(fd, VT_GETSTATE, &vcs) < 0)
+ return -errno;
+
+ return verify_vc_allocation(vcs.v_active);
+}
+
+static int verify_vc_kbmode(int fd) {
+ int curr_mode;
+
+ /*
+ * Make sure we only adjust consoles in K_XLATE or K_UNICODE mode.
+ * Otherwise we would (likely) interfere with X11's processing of the
+ * key events.
+ *
+ * http://lists.freedesktop.org/archives/systemd-devel/2013-February/008573.html
+ */
+
+ if (ioctl(fd, KDGKBMODE, &curr_mode) < 0)
+ return -errno;
+
+ return IN_SET(curr_mode, K_XLATE, K_UNICODE) ? 0 : -EBUSY;
+}
+
+static int toggle_utf8(const char *name, int fd, bool utf8) {
+ int r;
+ struct termios tc = {};
+
+ assert(name);
+
+ r = ioctl(fd, KDSKBMODE, utf8 ? K_UNICODE : K_XLATE);
+ if (r < 0)
+ return log_warning_errno(errno, "Failed to %s UTF-8 kbdmode on %s: %m", enable_disable(utf8), name);
+
+ r = loop_write(fd, utf8 ? "\033%G" : "\033%@", 3, false);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to %s UTF-8 term processing on %s: %m", enable_disable(utf8), name);
+
+ r = tcgetattr(fd, &tc);
+ if (r >= 0) {
+ SET_FLAG(tc.c_iflag, IUTF8, utf8);
+ r = tcsetattr(fd, TCSANOW, &tc);
+ }
+ if (r < 0)
+ return log_warning_errno(errno, "Failed to %s iutf8 flag on %s: %m", enable_disable(utf8), name);
+
+ log_debug("UTF-8 kbdmode %sd on %s", enable_disable(utf8), name);
+ return 0;
+}
+
+static int toggle_utf8_sysfs(bool utf8) {
+ int r;
+
+ r = write_string_file("/sys/module/vt/parameters/default_utf8", one_zero(utf8), WRITE_STRING_FILE_DISABLE_BUFFER);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to %s sysfs UTF-8 flag: %m", enable_disable(utf8));
+
+ log_debug("Sysfs UTF-8 flag %sd", enable_disable(utf8));
+ return 0;
+}
+
+static int keyboard_load_and_wait(const char *vc, const char *map, const char *map_toggle, bool utf8) {
+ const char *args[8];
+ unsigned i = 0;
+ pid_t pid;
+ int r;
+
+ /* An empty map means kernel map */
+ if (isempty(map))
+ 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;
+
+ if (DEBUG_LOGGING) {
+ _cleanup_free_ char *cmd;
+
+ cmd = strv_join((char**) args, " ");
+ log_debug("Executing \"%s\"...", strnull(cmd));
+ }
+
+ r = safe_fork("(loadkeys)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_RLIMIT_NOFILE_SAFE|FORK_LOG, &pid);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ execv(args[0], (char **) args);
+ _exit(EXIT_FAILURE);
+ }
+
+ return wait_for_terminate_and_check(KBD_LOADKEYS, pid, WAIT_LOG);
+}
+
+static int font_load_and_wait(const char *vc, const char *font, const char *map, const char *unimap) {
+ const char *args[9];
+ unsigned i = 0;
+ pid_t pid;
+ int r;
+
+ /* Any part can be set independently */
+ if (isempty(font) && isempty(map) && isempty(unimap))
+ return 0;
+
+ args[i++] = KBD_SETFONT;
+ args[i++] = "-C";
+ args[i++] = vc;
+ if (!isempty(map)) {
+ args[i++] = "-m";
+ args[i++] = map;
+ }
+ if (!isempty(unimap)) {
+ args[i++] = "-u";
+ args[i++] = unimap;
+ }
+ if (!isempty(font))
+ args[i++] = font;
+ args[i++] = NULL;
+
+ if (DEBUG_LOGGING) {
+ _cleanup_free_ char *cmd;
+
+ cmd = strv_join((char**) args, " ");
+ log_debug("Executing \"%s\"...", strnull(cmd));
+ }
+
+ r = safe_fork("(setfont)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_RLIMIT_NOFILE_SAFE|FORK_LOG, &pid);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ execv(args[0], (char **) args);
+ _exit(EXIT_FAILURE);
+ }
+
+ return wait_for_terminate_and_check(KBD_SETFONT, pid, WAIT_LOG);
+}
+
+/*
+ * A newly allocated VT uses the font from the source VT. Here
+ * we update all possibly already allocated VTs with the configured
+ * font. It also allows to restart systemd-vconsole-setup.service,
+ * to apply a new font to all VTs.
+ *
+ * We also setup per-console utf8 related stuff: kbdmode, term
+ * processing, stty iutf8.
+ */
+static void setup_remaining_vcs(int src_fd, unsigned src_idx, bool utf8) {
+ struct console_font_op cfo = {
+ .op = KD_FONT_OP_GET,
+ .width = UINT_MAX, .height = UINT_MAX,
+ .charcount = UINT_MAX,
+ };
+ struct unimapinit adv = {};
+ struct unimapdesc unimapd;
+ _cleanup_free_ struct unipair* unipairs = NULL;
+ _cleanup_free_ void *fontbuf = NULL;
+ unsigned i;
+ int r;
+
+ unipairs = new(struct unipair, USHRT_MAX);
+ if (!unipairs) {
+ log_oom();
+ return;
+ }
+
+ /* get metadata of the current font (width, height, count) */
+ r = ioctl(src_fd, KDFONTOP, &cfo);
+ if (r < 0)
+ log_warning_errno(errno, "KD_FONT_OP_GET failed while trying to get the font metadata: %m");
+ else {
+ /* verify parameter sanity first */
+ if (cfo.width > 32 || cfo.height > 32 || cfo.charcount > 512)
+ log_warning("Invalid font metadata - width: %u (max 32), height: %u (max 32), count: %u (max 512)",
+ cfo.width, cfo.height, cfo.charcount);
+ else {
+ /*
+ * Console fonts supported by the kernel are limited in size to 32 x 32 and maximum 512
+ * characters. Thus with 1 bit per pixel it requires up to 65536 bytes. The height always
+ * requries 32 per glyph, regardless of the actual height - see the comment above #define
+ * max_font_size 65536 in drivers/tty/vt/vt.c for more details.
+ */
+ fontbuf = malloc_multiply((cfo.width + 7) / 8 * 32, cfo.charcount);
+ if (!fontbuf) {
+ log_oom();
+ return;
+ }
+ /* get fonts from the source console */
+ cfo.data = fontbuf;
+ r = ioctl(src_fd, KDFONTOP, &cfo);
+ if (r < 0)
+ log_warning_errno(errno, "KD_FONT_OP_GET failed while trying to read the font data: %m");
+ else {
+ unimapd.entries = unipairs;
+ unimapd.entry_ct = USHRT_MAX;
+ r = ioctl(src_fd, GIO_UNIMAP, &unimapd);
+ if (r < 0)
+ log_warning_errno(errno, "GIO_UNIMAP failed while trying to read unicode mappings: %m");
+ else
+ cfo.op = KD_FONT_OP_SET;
+ }
+ }
+ }
+
+ if (cfo.op != KD_FONT_OP_SET)
+ log_warning("Fonts will not be copied to remaining consoles");
+
+ for (i = 1; i <= 63; i++) {
+ char ttyname[sizeof("/dev/tty63")];
+ _cleanup_close_ int fd_d = -1;
+
+ if (i == src_idx || verify_vc_allocation(i) < 0)
+ continue;
+
+ /* try to open terminal */
+ xsprintf(ttyname, "/dev/tty%u", i);
+ fd_d = open_terminal(ttyname, O_RDWR|O_CLOEXEC|O_NOCTTY);
+ if (fd_d < 0) {
+ log_warning_errno(fd_d, "Unable to open tty%u, fonts will not be copied: %m", i);
+ continue;
+ }
+
+ if (verify_vc_kbmode(fd_d) < 0)
+ continue;
+
+ toggle_utf8(ttyname, fd_d, utf8);
+
+ if (cfo.op != KD_FONT_OP_SET)
+ continue;
+
+ r = ioctl(fd_d, KDFONTOP, &cfo);
+ if (r < 0) {
+ int last_errno, mode;
+
+ /* The fonts couldn't have been copied. It might be due to the
+ * terminal being in graphical mode. In this case the kernel
+ * returns -EINVAL which is too generic for distinguishing this
+ * specific case. So we need to retrieve the terminal mode and if
+ * the graphical mode is in used, let's assume that something else
+ * is using the terminal and the failure was expected as we
+ * shouldn't have tried to copy the fonts. */
+
+ last_errno = errno;
+ if (ioctl(fd_d, KDGETMODE, &mode) >= 0 && mode != KD_TEXT)
+ log_debug("KD_FONT_OP_SET skipped: tty%u is not in text mode", i);
+ else
+ log_warning_errno(last_errno, "KD_FONT_OP_SET failed, fonts will not be copied to tty%u: %m", i);
+
+ continue;
+ }
+
+ /*
+ * copy unicode translation table unimapd is a ushort count and a pointer
+ * to an array of struct unipair { ushort, ushort }
+ */
+ r = ioctl(fd_d, PIO_UNIMAPCLR, &adv);
+ if (r < 0) {
+ log_warning_errno(errno, "PIO_UNIMAPCLR failed, unimaps might be incorrect for tty%u: %m", i);
+ continue;
+ }
+
+ r = ioctl(fd_d, PIO_UNIMAP, &unimapd);
+ if (r < 0) {
+ log_warning_errno(errno, "PIO_UNIMAP failed, unimaps might be incorrect for tty%u: %m", i);
+ continue;
+ }
+
+ log_debug("Font and unimap successfully copied to %s", ttyname);
+ }
+}
+
+static int find_source_vc(char **ret_path, unsigned *ret_idx) {
+ _cleanup_free_ char *path = NULL;
+ int r, err = 0;
+ unsigned i;
+
+ path = new(char, sizeof("/dev/tty63"));
+ if (!path)
+ return log_oom();
+
+ for (i = 1; i <= 63; i++) {
+ _cleanup_close_ int fd = -1;
+
+ r = verify_vc_allocation(i);
+ if (r < 0) {
+ if (!err)
+ err = -r;
+ continue;
+ }
+
+ sprintf(path, "/dev/tty%u", i);
+ fd = open_terminal(path, O_RDWR|O_CLOEXEC|O_NOCTTY);
+ if (fd < 0) {
+ if (!err)
+ err = -fd;
+ continue;
+ }
+ r = verify_vc_kbmode(fd);
+ if (r < 0) {
+ if (!err)
+ err = -r;
+ continue;
+ }
+
+ /* all checks passed, return this one as a source console */
+ *ret_idx = i;
+ *ret_path = TAKE_PTR(path);
+ return TAKE_FD(fd);
+ }
+
+ return log_error_errno(err, "No usable source console found: %m");
+}
+
+static int verify_source_vc(char **ret_path, const char *src_vc) {
+ _cleanup_close_ int fd = -1;
+ char *path;
+ int r;
+
+ fd = open_terminal(src_vc, O_RDWR|O_CLOEXEC|O_NOCTTY);
+ if (fd < 0)
+ return log_error_errno(fd, "Failed to open %s: %m", src_vc);
+
+ r = verify_vc_device(fd);
+ if (r < 0)
+ return log_error_errno(r, "Device %s is not a virtual console: %m", src_vc);
+
+ r = verify_vc_allocation_byfd(fd);
+ if (r < 0)
+ return log_error_errno(r, "Virtual console %s is not allocated: %m", src_vc);
+
+ r = verify_vc_kbmode(fd);
+ if (r < 0)
+ return log_error_errno(r, "Virtual console %s is not in K_XLATE or K_UNICODE: %m", src_vc);
+
+ path = strdup(src_vc);
+ if (!path)
+ return log_oom();
+
+ *ret_path = path;
+ return TAKE_FD(fd);
+}
+
+int main(int argc, char **argv) {
+ _cleanup_free_ char
+ *vc = NULL,
+ *vc_keymap = NULL, *vc_keymap_toggle = NULL,
+ *vc_font = NULL, *vc_font_map = NULL, *vc_font_unimap = NULL;
+ _cleanup_close_ int fd = -1;
+ bool utf8, keyboard_ok;
+ unsigned idx = 0;
+ int r;
+
+ log_setup_service();
+
+ umask(0022);
+
+ if (argv[1])
+ fd = verify_source_vc(&vc, argv[1]);
+ else
+ fd = find_source_vc(&vc, &idx);
+ if (fd < 0)
+ return EXIT_FAILURE;
+
+ utf8 = is_locale_utf8();
+
+ r = parse_env_file(NULL, "/etc/vconsole.conf",
+ "KEYMAP", &vc_keymap,
+ "KEYMAP_TOGGLE", &vc_keymap_toggle,
+ "FONT", &vc_font,
+ "FONT_MAP", &vc_font_map,
+ "FONT_UNIMAP", &vc_font_unimap);
+ if (r < 0 && r != -ENOENT)
+ log_warning_errno(r, "Failed to read /etc/vconsole.conf: %m");
+
+ /* Let the kernel command line override /etc/vconsole.conf */
+ r = proc_cmdline_get_key_many(
+ PROC_CMDLINE_STRIP_RD_PREFIX,
+ "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,
+ /* compatibility with obsolete multiple-dot scheme */
+ "vconsole.keymap.toggle", &vc_keymap_toggle,
+ "vconsole.font.map", &vc_font_map,
+ "vconsole.font.unimap", &vc_font_unimap);
+ if (r < 0 && r != -ENOENT)
+ log_warning_errno(r, "Failed to read /proc/cmdline: %m");
+
+ (void) toggle_utf8_sysfs(utf8);
+ (void) toggle_utf8(vc, fd, utf8);
+
+ r = font_load_and_wait(vc, vc_font, vc_font_map, vc_font_unimap);
+ keyboard_ok = keyboard_load_and_wait(vc, vc_keymap, vc_keymap_toggle, utf8) == 0;
+
+ if (idx > 0) {
+ if (r == 0)
+ setup_remaining_vcs(fd, idx, utf8);
+ else if (r == EX_OSERR)
+ /* setfont returns EX_OSERR when ioctl(KDFONTOP/PIO_FONTX/PIO_FONTX) fails.
+ * This might mean various things, but in particular lack of a graphical
+ * console. Let's be generous and not treat this as an error. */
+ log_notice("Setting fonts failed with a \"system error\", ignoring.");
+ else
+ log_warning("Setting source virtual console failed, ignoring remaining ones");
+ }
+
+ return IN_SET(r, 0, EX_OSERR) && keyboard_ok ? EXIT_SUCCESS : EXIT_FAILURE;
+}
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