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. */
23 static void release_vt(int signo UNUSED_PARAM)
25 /* If -a, param is 0, which means:
26 * "no, kernel, we don't allow console switch away from us!" */
27 ioctl(STDIN_FILENO, VT_RELDISP, (unsigned long) !option_mask32);
30 static void acquire_vt(int signo UNUSED_PARAM)
32 /* ACK to kernel that switch to console is successful */
33 ioctl(STDIN_FILENO, VT_RELDISP, VT_ACKACQ);
37 int vlock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
38 int vlock_main(int argc UNUSED_PARAM, char **argv)
48 pw = xgetpwuid(getuid());
49 opt_complementary = "=0"; /* no params! */
52 /* Ignore some signals so that we don't get killed by them */
58 + (1 << SIGCHLD) /* paranoia :) */
64 /* We will use SIGUSRx for console switch control: */
66 signal_SA_RESTART_empty_mask(SIGUSR1, release_vt);
67 signal_SA_RESTART_empty_mask(SIGUSR2, acquire_vt);
73 /* Revert stdin/out to our controlling tty
74 * (or die if we have none) */
75 xmove_fd(xopen(CURRENT_TTY, O_RDWR), STDIN_FILENO);
76 xdup2(STDIN_FILENO, STDOUT_FILENO);
79 xioctl(STDIN_FILENO, VT_GETMODE, &vtm);
81 /* "console switches are controlled by us, not kernel!" */
82 vtm.mode = VT_PROCESS;
85 ioctl(STDIN_FILENO, VT_SETMODE, &vtm);
88 tcgetattr(STDIN_FILENO, &oterm);
90 term.c_iflag &= ~BRKINT;
91 term.c_iflag |= IGNBRK;
92 term.c_lflag &= ~ISIG;
93 term.c_lflag &= ~(ECHO | ECHOCTL);
94 tcsetattr_stdin_TCSANOW(&term);
97 printf("Virtual console%s locked by %s.\n",
98 option_mask32 /*o_lock_all*/ ? "s" : "",
100 if (correct_password(pw)) {
103 bb_do_delay(FAIL_DELAY);
104 puts("Password incorrect");
108 ioctl(STDIN_FILENO, VT_SETMODE, &ovtm);
110 tcsetattr_stdin_TCSANOW(&oterm);
111 fflush_stdout_and_exit(EXIT_SUCCESS);