source: branches/3.0/mindi-busybox/loginutils/vlock.c @ 2899

Last change on this file since 2899 was 2725, checked in by bruno, 8 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
File size: 2.7 KB
Line 
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 *
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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
18#include "libbb.h"
19
20#ifdef __linux__
21#include <sys/vt.h>
22
23static void release_vt(int signo UNUSED_PARAM)
24{
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);
28}
29
30static void acquire_vt(int signo UNUSED_PARAM)
31{
32    /* ACK to kernel that switch to console is successful */
33    ioctl(STDIN_FILENO, VT_RELDISP, VT_ACKACQ);
34}
35#endif
36
37int vlock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
38int vlock_main(int argc UNUSED_PARAM, char **argv)
39{
40#ifdef __linux__
41    struct vt_mode vtm;
42    struct vt_mode ovtm;
43#endif
44    struct termios term;
45    struct termios oterm;
46    struct passwd *pw;
47
48    pw = xgetpwuid(getuid());
49    opt_complementary = "=0"; /* no params! */
50    getopt32(argv, "a");
51
52    /* Ignore some signals so that we don't get killed by them */
53    bb_signals(0
54        + (1 << SIGTSTP)
55        + (1 << SIGTTIN)
56        + (1 << SIGTTOU)
57        + (1 << SIGHUP )
58        + (1 << SIGCHLD) /* paranoia :) */
59        + (1 << SIGQUIT)
60        + (1 << SIGINT )
61        , SIG_IGN);
62
63#ifdef __linux__
64    /* We will use SIGUSRx for console switch control: */
65    /* 1: set handlers */
66    signal_SA_RESTART_empty_mask(SIGUSR1, release_vt);
67    signal_SA_RESTART_empty_mask(SIGUSR2, acquire_vt);
68    /* 2: unmask them */
69    sig_unblock(SIGUSR1);
70    sig_unblock(SIGUSR2);
71#endif
72
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);
77
78#ifdef __linux__
79    xioctl(STDIN_FILENO, VT_GETMODE, &vtm);
80    ovtm = vtm;
81    /* "console switches are controlled by us, not kernel!" */
82    vtm.mode = VT_PROCESS;
83    vtm.relsig = SIGUSR1;
84    vtm.acqsig = SIGUSR2;
85    ioctl(STDIN_FILENO, VT_SETMODE, &vtm);
86#endif
87
88    tcgetattr(STDIN_FILENO, &oterm);
89    term = 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);
95
96    do {
97        printf("Virtual console%s locked by %s.\n",
98                option_mask32 /*o_lock_all*/ ? "s" : "",
99                pw->pw_name);
100        if (correct_password(pw)) {
101            break;
102        }
103        bb_do_delay(FAIL_DELAY);
104        puts("Password incorrect");
105    } while (1);
106
107#ifdef __linux__
108    ioctl(STDIN_FILENO, VT_SETMODE, &ovtm);
109#endif
110    tcsetattr_stdin_TCSANOW(&oterm);
111    fflush_stdout_and_exit(EXIT_SUCCESS);
112}
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