* Copyright (C) 2000 by spoon <spoon@ix.netcom.com>
* Written by spoon <spon@ix.netcom.com>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/* Shoutz to Michael K. Johnson <johnsonm@redhat.com>, author of the
/* Fixed by Erik Andersen to do passwords the tinylogin way...
* It now works with md5, sha1, etc passwords. */
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/vt.h>
-#include <signal.h>
-#include <string.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <sys/ioctl.h>
-#include <termios.h>
+//usage:#define vlock_trivial_usage
+//usage: "[-a]"
+//usage:#define vlock_full_usage "\n\n"
+//usage: "Lock a virtual terminal. A password is required to unlock.\n"
+//usage: "\n -a Lock all VTs"
-#include "busybox.h"
+#include "libbb.h"
-static struct passwd *pw;
-static struct vt_mode ovtm;
-static struct termios oterm;
-static int vfd;
-static unsigned long o_lock_all;
-
-static void release_vt(int signo)
-{
- if (!o_lock_all)
- ioctl(vfd, VT_RELDISP, 1);
- else
- ioctl(vfd, VT_RELDISP, 0);
-}
+#ifdef __linux__
+#include <sys/vt.h>
-static void acquire_vt(int signo)
+static void release_vt(int signo UNUSED_PARAM)
{
- ioctl(vfd, VT_RELDISP, VT_ACKACQ);
+ /* If -a, param is 0, which means:
+ * "no, kernel, we don't allow console switch away from us!" */
+ ioctl(STDIN_FILENO, VT_RELDISP, (unsigned long) !option_mask32);
}
-static void restore_terminal(void)
+static void acquire_vt(int signo UNUSED_PARAM)
{
- ioctl(vfd, VT_SETMODE, &ovtm);
- tcsetattr(STDIN_FILENO, TCSANOW, &oterm);
+ /* ACK to kernel that switch to console is successful */
+ ioctl(STDIN_FILENO, VT_RELDISP, VT_ACKACQ);
}
+#endif
-extern int vlock_main(int argc, char **argv)
+int vlock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int vlock_main(int argc UNUSED_PARAM, char **argv)
{
- sigset_t sig;
- struct sigaction sa;
+#ifdef __linux__
struct vt_mode vtm;
+ struct vt_mode ovtm;
+#endif
struct termios term;
-
- if (argc > 2) {
- bb_show_usage();
- }
-
- o_lock_all = bb_getopt_ulflags (argc, argv, "a");
-
- if((pw = getpwuid(getuid())) == NULL) {
- bb_error_msg_and_die("Unknown uid %d", getuid());
- }
-
- vfd = bb_xopen(CURRENT_TTY, O_RDWR);
-
- if (ioctl(vfd, VT_GETMODE, &vtm) < 0) {
- bb_perror_msg_and_die("VT_GETMODE");
- }
-
- /* mask a bunch of signals */
- sigprocmask(SIG_SETMASK, NULL, &sig);
- sigdelset(&sig, SIGUSR1);
- sigdelset(&sig, SIGUSR2);
- sigaddset(&sig, SIGTSTP);
- sigaddset(&sig, SIGTTIN);
- sigaddset(&sig, SIGTTOU);
- sigaddset(&sig, SIGHUP);
- sigaddset(&sig, SIGCHLD);
- sigaddset(&sig, SIGQUIT);
- sigaddset(&sig, SIGINT);
-
- sigemptyset(&(sa.sa_mask));
- sa.sa_flags = SA_RESTART;
- sa.sa_handler = release_vt;
- sigaction(SIGUSR1, &sa, NULL);
- sa.sa_handler = acquire_vt;
- sigaction(SIGUSR2, &sa, NULL);
-
- /* need to handle some signals so that we don't get killed by them */
- sa.sa_handler = SIG_IGN;
- sigaction(SIGHUP, &sa, NULL);
- sigaction(SIGQUIT, &sa, NULL);
- sigaction(SIGINT, &sa, NULL);
- sigaction(SIGTSTP, &sa, NULL);
-
+ struct termios oterm;
+ struct passwd *pw;
+
+ pw = xgetpwuid(getuid());
+ opt_complementary = "=0"; /* no params! */
+ getopt32(argv, "a");
+
+ /* Ignore some signals so that we don't get killed by them */
+ bb_signals(0
+ + (1 << SIGTSTP)
+ + (1 << SIGTTIN)
+ + (1 << SIGTTOU)
+ + (1 << SIGHUP )
+ + (1 << SIGCHLD) /* paranoia :) */
+ + (1 << SIGQUIT)
+ + (1 << SIGINT )
+ , SIG_IGN);
+
+#ifdef __linux__
+ /* We will use SIGUSRx for console switch control: */
+ /* 1: set handlers */
+ signal_SA_RESTART_empty_mask(SIGUSR1, release_vt);
+ signal_SA_RESTART_empty_mask(SIGUSR2, acquire_vt);
+ /* 2: unmask them */
+ sig_unblock(SIGUSR1);
+ sig_unblock(SIGUSR2);
+#endif
+
+ /* Revert stdin/out to our controlling tty
+ * (or die if we have none) */
+ xmove_fd(xopen(CURRENT_TTY, O_RDWR), STDIN_FILENO);
+ xdup2(STDIN_FILENO, STDOUT_FILENO);
+
+#ifdef __linux__
+ xioctl(STDIN_FILENO, VT_GETMODE, &vtm);
ovtm = vtm;
+ /* "console switches are controlled by us, not kernel!" */
vtm.mode = VT_PROCESS;
vtm.relsig = SIGUSR1;
vtm.acqsig = SIGUSR2;
- ioctl(vfd, VT_SETMODE, &vtm);
+ ioctl(STDIN_FILENO, VT_SETMODE, &vtm);
+#endif
tcgetattr(STDIN_FILENO, &oterm);
term = oterm;
term.c_iflag |= IGNBRK;
term.c_lflag &= ~ISIG;
term.c_lflag &= ~(ECHO | ECHOCTL);
- tcsetattr(STDIN_FILENO, TCSANOW, &term);
-
- do {
- printf("Virtual Console%s locked.\n%s's ", (o_lock_all) ? "s" : "", pw->pw_name);
- fflush(stdout);
- if (correct_password (pw)) {
+ tcsetattr_stdin_TCSANOW(&term);
+
+ while (1) {
+ printf("Virtual console%s locked by %s.\n",
+ /* "s" if -a, else "": */ "s" + !option_mask32,
+ pw->pw_name
+ );
+ if (ask_and_check_password(pw) > 0) {
break;
}
- sleep(10);
- puts("Password incorrect.");
- } while (1);
- restore_terminal();
- return 0;
-}
+ bb_do_delay(LOGIN_FAIL_DELAY);
+ puts("Incorrect password");
+ }
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
+#ifdef __linux__
+ ioctl(STDIN_FILENO, VT_SETMODE, &ovtm);
+#endif
+ tcsetattr_stdin_TCSANOW(&oterm);
+ fflush_stdout_and_exit(EXIT_SUCCESS);
+}
projects / oweals / busybox.git / blobdiff