1 /* vi: set sw=4 ts=4: */
3 * vlock implementation for busybox
5 * Copyright (C) 2000 by spoon <spoon@ix.netcom.com>
6 * Written by spoon <spon@ix.netcom.com>
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
11 /* Shoutz to Michael K. Johnson <johnsonm@redhat.com>, author of the
12 * original vlock. I snagged a bunch of his code to write this
15 /* Fixed by Erik Andersen to do passwords the tinylogin way...
16 * It now works with md5, sha1, etc passwords. */
18 //usage:#define vlock_trivial_usage
20 //usage:#define vlock_full_usage "\n\n"
21 //usage: "Lock a virtual terminal. A password is required to unlock.\n"
23 //usage: "\n -a Lock all VTs"
30 static void release_vt(int signo UNUSED_PARAM)
32 /* If -a, param is 0, which means:
33 * "no, kernel, we don't allow console switch away from us!" */
34 ioctl(STDIN_FILENO, VT_RELDISP, (unsigned long) !option_mask32);
37 static void acquire_vt(int signo UNUSED_PARAM)
39 /* ACK to kernel that switch to console is successful */
40 ioctl(STDIN_FILENO, VT_RELDISP, VT_ACKACQ);
44 int vlock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
45 int vlock_main(int argc UNUSED_PARAM, char **argv)
55 pw = xgetpwuid(getuid());
56 opt_complementary = "=0"; /* no params! */
59 /* Ignore some signals so that we don't get killed by them */
65 + (1 << SIGCHLD) /* paranoia :) */
71 /* We will use SIGUSRx for console switch control: */
73 signal_SA_RESTART_empty_mask(SIGUSR1, release_vt);
74 signal_SA_RESTART_empty_mask(SIGUSR2, acquire_vt);
80 /* Revert stdin/out to our controlling tty
81 * (or die if we have none) */
82 xmove_fd(xopen(CURRENT_TTY, O_RDWR), STDIN_FILENO);
83 xdup2(STDIN_FILENO, STDOUT_FILENO);
86 xioctl(STDIN_FILENO, VT_GETMODE, &vtm);
88 /* "console switches are controlled by us, not kernel!" */
89 vtm.mode = VT_PROCESS;
92 ioctl(STDIN_FILENO, VT_SETMODE, &vtm);
95 tcgetattr(STDIN_FILENO, &oterm);
97 term.c_iflag &= ~BRKINT;
98 term.c_iflag |= IGNBRK;
99 term.c_lflag &= ~ISIG;
100 term.c_lflag &= ~(ECHO | ECHOCTL);
101 tcsetattr_stdin_TCSANOW(&term);
104 printf("Virtual console%s locked by %s.\n",
105 /* "s" if -a, else "": */ "s" + !option_mask32,
108 if (correct_password(pw)) {
111 bb_do_delay(LOGIN_FAIL_DELAY);
112 puts("Incorrect password");
116 ioctl(STDIN_FILENO, VT_SETMODE, &ovtm);
118 tcsetattr_stdin_TCSANOW(&oterm);
119 fflush_stdout_and_exit(EXIT_SUCCESS);