source: branches/3.2/mindi-busybox/loginutils/vlock.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 2.9 KB
RevLine 
[821]1/* vi: set sw=4 ts=4: */
2/*
3 * vlock implementation for busybox
4 *
5 * Copyright (C) 2000 by spoon <spoon@ix.netcom.com>
6 * Written by spoon <spon@ix.netcom.com>
7 *
[2725]8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
[821]9 */
10
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
13 * minimalistic vlock.
14 */
15/* Fixed by Erik Andersen to do passwords the tinylogin way...
16 * It now works with md5, sha1, etc passwords. */
17
[3232]18//usage:#define vlock_trivial_usage
19//usage:       "[-a]"
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"
23
[1765]24#include "libbb.h"
[2725]25
26#ifdef __linux__
[821]27#include <sys/vt.h>
28
[2725]29static void release_vt(int signo UNUSED_PARAM)
[821]30{
[2725]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);
[821]34}
35
[2725]36static void acquire_vt(int signo UNUSED_PARAM)
[821]37{
[2725]38    /* ACK to kernel that switch to console is successful */
39    ioctl(STDIN_FILENO, VT_RELDISP, VT_ACKACQ);
[821]40}
[2725]41#endif
[821]42
[2725]43int vlock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
44int vlock_main(int argc UNUSED_PARAM, char **argv)
[821]45{
[2725]46#ifdef __linux__
[821]47    struct vt_mode vtm;
[2725]48    struct vt_mode ovtm;
49#endif
[821]50    struct termios term;
[2725]51    struct termios oterm;
52    struct passwd *pw;
[821]53
[2725]54    pw = xgetpwuid(getuid());
55    opt_complementary = "=0"; /* no params! */
56    getopt32(argv, "a");
[1765]57
[2725]58    /* Ignore some signals so that we don't get killed by them */
59    bb_signals(0
60        + (1 << SIGTSTP)
61        + (1 << SIGTTIN)
62        + (1 << SIGTTOU)
63        + (1 << SIGHUP )
64        + (1 << SIGCHLD) /* paranoia :) */
65        + (1 << SIGQUIT)
66        + (1 << SIGINT )
67        , SIG_IGN);
[821]68
[2725]69#ifdef __linux__
70    /* We will use SIGUSRx for console switch control: */
71    /* 1: set handlers */
72    signal_SA_RESTART_empty_mask(SIGUSR1, release_vt);
73    signal_SA_RESTART_empty_mask(SIGUSR2, acquire_vt);
74    /* 2: unmask them */
75    sig_unblock(SIGUSR1);
76    sig_unblock(SIGUSR2);
77#endif
[821]78
[2725]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);
[821]83
[2725]84#ifdef __linux__
85    xioctl(STDIN_FILENO, VT_GETMODE, &vtm);
[821]86    ovtm = vtm;
[2725]87    /* "console switches are controlled by us, not kernel!" */
[821]88    vtm.mode = VT_PROCESS;
89    vtm.relsig = SIGUSR1;
90    vtm.acqsig = SIGUSR2;
[2725]91    ioctl(STDIN_FILENO, VT_SETMODE, &vtm);
92#endif
[821]93
94    tcgetattr(STDIN_FILENO, &oterm);
95    term = oterm;
96    term.c_iflag &= ~BRKINT;
97    term.c_iflag |= IGNBRK;
98    term.c_lflag &= ~ISIG;
99    term.c_lflag &= ~(ECHO | ECHOCTL);
[2725]100    tcsetattr_stdin_TCSANOW(&term);
[821]101
[3232]102    while (1) {
[2725]103        printf("Virtual console%s locked by %s.\n",
[3232]104                /* "s" if -a, else "": */ "s" + !option_mask32,
105                pw->pw_name
106        );
[1765]107        if (correct_password(pw)) {
[821]108            break;
109        }
[3232]110        bb_do_delay(LOGIN_FAIL_DELAY);
111        puts("Incorrect password");
112    }
[2725]113
114#ifdef __linux__
115    ioctl(STDIN_FILENO, VT_SETMODE, &ovtm);
116#endif
117    tcsetattr_stdin_TCSANOW(&oterm);
118    fflush_stdout_and_exit(EXIT_SUCCESS);
[821]119}
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