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"
22 //usage: "\n -a Lock all VTs"
29 static void release_vt(int signo UNUSED_PARAM
)
31 /* If -a, param is 0, which means:
32 * "no, kernel, we don't allow console switch away from us!" */
33 ioctl(STDIN_FILENO
, VT_RELDISP
, (unsigned long) !option_mask32
);
36 static void acquire_vt(int signo UNUSED_PARAM
)
38 /* ACK to kernel that switch to console is successful */
39 ioctl(STDIN_FILENO
, VT_RELDISP
, VT_ACKACQ
);
43 int vlock_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
44 int vlock_main(int argc UNUSED_PARAM
, char **argv
)
54 pw
= xgetpwuid(getuid());
55 opt_complementary
= "=0"; /* no params! */
58 /* Ignore some signals so that we don't get killed by them */
64 + (1 << SIGCHLD
) /* paranoia :) */
70 /* We will use SIGUSRx for console switch control: */
72 signal_SA_RESTART_empty_mask(SIGUSR1
, release_vt
);
73 signal_SA_RESTART_empty_mask(SIGUSR2
, acquire_vt
);
79 /* Revert stdin/out to our controlling tty
80 * (or die if we have none) */
81 xmove_fd(xopen(CURRENT_TTY
, O_RDWR
), STDIN_FILENO
);
82 xdup2(STDIN_FILENO
, STDOUT_FILENO
);
85 xioctl(STDIN_FILENO
, VT_GETMODE
, &vtm
);
87 /* "console switches are controlled by us, not kernel!" */
88 vtm
.mode
= VT_PROCESS
;
91 ioctl(STDIN_FILENO
, VT_SETMODE
, &vtm
);
94 tcgetattr(STDIN_FILENO
, &oterm
);
96 term
.c_iflag
&= ~BRKINT
;
97 term
.c_iflag
|= IGNBRK
;
98 term
.c_lflag
&= ~ISIG
;
99 term
.c_lflag
&= ~(ECHO
| ECHOCTL
);
100 tcsetattr_stdin_TCSANOW(&term
);
103 printf("Virtual console%s locked by %s.\n",
104 /* "s" if -a, else "": */ "s" + !option_mask32
,
107 if (correct_password(pw
)) {
110 bb_do_delay(LOGIN_FAIL_DELAY
);
111 puts("Incorrect password");
115 ioctl(STDIN_FILENO
, VT_SETMODE
, &ovtm
);
117 tcsetattr_stdin_TCSANOW(&oterm
);
118 fflush_stdout_and_exit(EXIT_SUCCESS
);