Contents of /trunk/mkinitrd-magellan/busybox/loginutils/vlock.c
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Revision 984 -
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 2683 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
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 | struct passwd *pw; |
42 | |
43 | pw = xgetpwuid(getuid()); |
44 | opt_complementary = "=0"; /* no params! */ |
45 | getopt32(argv, "a"); |
46 | |
47 | /* Ignore some signals so that we don't get killed by them */ |
48 | bb_signals(0 |
49 | + (1 << SIGTSTP) |
50 | + (1 << SIGTTIN) |
51 | + (1 << SIGTTOU) |
52 | + (1 << SIGHUP ) |
53 | + (1 << SIGCHLD) /* paranoia :) */ |
54 | + (1 << SIGQUIT) |
55 | + (1 << SIGINT ) |
56 | , SIG_IGN); |
57 | |
58 | /* We will use SIGUSRx for console switch control: */ |
59 | /* 1: set handlers */ |
60 | signal_SA_RESTART_empty_mask(SIGUSR1, release_vt); |
61 | signal_SA_RESTART_empty_mask(SIGUSR2, acquire_vt); |
62 | /* 2: unmask them */ |
63 | sig_unblock(SIGUSR1); |
64 | sig_unblock(SIGUSR2); |
65 | |
66 | /* Revert stdin/out to our controlling tty |
67 | * (or die if we have none) */ |
68 | xmove_fd(xopen(CURRENT_TTY, O_RDWR), STDIN_FILENO); |
69 | xdup2(STDIN_FILENO, STDOUT_FILENO); |
70 | |
71 | xioctl(STDIN_FILENO, VT_GETMODE, &vtm); |
72 | ovtm = vtm; |
73 | /* "console switches are controlled by us, not kernel!" */ |
74 | vtm.mode = VT_PROCESS; |
75 | vtm.relsig = SIGUSR1; |
76 | vtm.acqsig = SIGUSR2; |
77 | ioctl(STDIN_FILENO, VT_SETMODE, &vtm); |
78 | |
79 | tcgetattr(STDIN_FILENO, &oterm); |
80 | term = oterm; |
81 | term.c_iflag &= ~BRKINT; |
82 | term.c_iflag |= IGNBRK; |
83 | term.c_lflag &= ~ISIG; |
84 | term.c_lflag &= ~(ECHO | ECHOCTL); |
85 | tcsetattr_stdin_TCSANOW(&term); |
86 | |
87 | do { |
88 | printf("Virtual console%s locked by %s.\n", |
89 | option_mask32 /*o_lock_all*/ ? "s" : "", |
90 | pw->pw_name); |
91 | if (correct_password(pw)) { |
92 | break; |
93 | } |
94 | bb_do_delay(FAIL_DELAY); |
95 | puts("Password incorrect"); |
96 | } while (1); |
97 | |
98 | ioctl(STDIN_FILENO, VT_SETMODE, &ovtm); |
99 | tcsetattr_stdin_TCSANOW(&oterm); |
100 | fflush_stdout_and_exit(EXIT_SUCCESS); |
101 | } |