Contents of /tags/mkinitrd-6_1_0/busybox/loginutils/vlock.c
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Fri Apr 24 19:09:57 2009 UTC (15 years, 5 months ago) by niro
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Fri Apr 24 19:09:57 2009 UTC (15 years, 5 months ago) by niro
File MIME type: text/plain
File size: 2796 byte(s)
tagged 'mkinitrd-6_1_0'
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 tarball for details. |
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 <sys/vt.h> |
19 | #include "libbb.h" |
20 | |
21 | static void release_vt(int signo UNUSED_PARAM) |
22 | { |
23 | /* If -a, param is 0, which means: |
24 | * "no, kernel, we don't allow console switch away from us!" */ |
25 | ioctl(STDIN_FILENO, VT_RELDISP, (unsigned long) !option_mask32); |
26 | } |
27 | |
28 | static void acquire_vt(int signo UNUSED_PARAM) |
29 | { |
30 | /* ACK to kernel that switch to console is successful */ |
31 | ioctl(STDIN_FILENO, VT_RELDISP, VT_ACKACQ); |
32 | } |
33 | |
34 | int vlock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
35 | int vlock_main(int argc UNUSED_PARAM, char **argv) |
36 | { |
37 | struct vt_mode vtm; |
38 | struct termios term; |
39 | struct termios oterm; |
40 | struct vt_mode ovtm; |
41 | uid_t uid; |
42 | struct passwd *pw; |
43 | /* XXX: xgetpwuid */ |
44 | uid = getuid(); |
45 | pw = getpwuid(uid); |
46 | if (pw == NULL) |
47 | bb_error_msg_and_die("unknown uid %d", (int)uid); |
48 | |
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 | /* We will use SIGUSRx for console switch control: */ |
64 | /* 1: set handlers */ |
65 | signal_SA_RESTART_empty_mask(SIGUSR1, release_vt); |
66 | signal_SA_RESTART_empty_mask(SIGUSR2, acquire_vt); |
67 | /* 2: unmask them */ |
68 | sig_unblock(SIGUSR1); |
69 | sig_unblock(SIGUSR2); |
70 | |
71 | /* Revert stdin/out to our controlling tty |
72 | * (or die if we have none) */ |
73 | xmove_fd(xopen(CURRENT_TTY, O_RDWR), STDIN_FILENO); |
74 | xdup2(STDIN_FILENO, STDOUT_FILENO); |
75 | |
76 | xioctl(STDIN_FILENO, VT_GETMODE, &vtm); |
77 | ovtm = vtm; |
78 | /* "console switches are controlled by us, not kernel!" */ |
79 | vtm.mode = VT_PROCESS; |
80 | vtm.relsig = SIGUSR1; |
81 | vtm.acqsig = SIGUSR2; |
82 | ioctl(STDIN_FILENO, VT_SETMODE, &vtm); |
83 | |
84 | tcgetattr(STDIN_FILENO, &oterm); |
85 | term = oterm; |
86 | term.c_iflag &= ~BRKINT; |
87 | term.c_iflag |= IGNBRK; |
88 | term.c_lflag &= ~ISIG; |
89 | term.c_lflag &= ~(ECHO | ECHOCTL); |
90 | tcsetattr_stdin_TCSANOW(&term); |
91 | |
92 | do { |
93 | printf("Virtual console%s locked by %s.\n", |
94 | option_mask32 /*o_lock_all*/ ? "s" : "", |
95 | pw->pw_name); |
96 | if (correct_password(pw)) { |
97 | break; |
98 | } |
99 | bb_do_delay(FAIL_DELAY); |
100 | puts("Password incorrect"); |
101 | } while (1); |
102 | |
103 | ioctl(STDIN_FILENO, VT_SETMODE, &ovtm); |
104 | tcsetattr_stdin_TCSANOW(&oterm); |
105 | fflush_stdout_and_exit(EXIT_SUCCESS); |
106 | } |