source: branches/2.2.5/mindi-busybox/loginutils/vlock.c @ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 13 years ago

Update to busybox 1.7.2

File size: 2.6 KB
Line 
1/* vi: set sw=4 ts=4: */
2
3/*
4 * vlock implementation for busybox
5 *
6 * Copyright (C) 2000 by spoon <spoon@ix.netcom.com>
7 * Written by spoon <spon@ix.netcom.com>
8 *
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10 */
11
12/* Shoutz to Michael K. Johnson <johnsonm@redhat.com>, author of the
13 * original vlock.  I snagged a bunch of his code to write this
14 * minimalistic vlock.
15 */
16/* Fixed by Erik Andersen to do passwords the tinylogin way...
17 * It now works with md5, sha1, etc passwords. */
18
19#include "libbb.h"
20#include <sys/vt.h>
21
22static struct passwd *pw;
23static struct vt_mode ovtm;
24static struct termios oterm;
25static int vfd;
26static unsigned long o_lock_all;
27
28static void release_vt(int signo)
29{
30    ioctl(vfd, VT_RELDISP, !o_lock_all);
31}
32
33static void acquire_vt(int signo)
34{
35    ioctl(vfd, VT_RELDISP, VT_ACKACQ);
36}
37
38static void restore_terminal(void)
39{
40    ioctl(vfd, VT_SETMODE, &ovtm);
41    tcsetattr(STDIN_FILENO, TCSANOW, &oterm);
42}
43
44int vlock_main(int argc, char **argv);
45int vlock_main(int argc, char **argv)
46{
47    sigset_t sig;
48    struct sigaction sa;
49    struct vt_mode vtm;
50    struct termios term;
51    uid_t uid = getuid();
52
53    pw = getpwuid(uid);
54    if (pw == NULL)
55        bb_error_msg_and_die("unknown uid %d", uid);
56
57    if (argc > 2) {
58        bb_show_usage();
59    }
60
61    o_lock_all = getopt32(argv, "a");
62
63    vfd = xopen(CURRENT_TTY, O_RDWR);
64
65    xioctl(vfd, VT_GETMODE, &vtm);
66
67    /* mask a bunch of signals */
68    sigprocmask(SIG_SETMASK, NULL, &sig);
69    sigdelset(&sig, SIGUSR1);
70    sigdelset(&sig, SIGUSR2);
71    sigaddset(&sig, SIGTSTP);
72    sigaddset(&sig, SIGTTIN);
73    sigaddset(&sig, SIGTTOU);
74    sigaddset(&sig, SIGHUP);
75    sigaddset(&sig, SIGCHLD);
76    sigaddset(&sig, SIGQUIT);
77    sigaddset(&sig, SIGINT);
78
79    sigemptyset(&(sa.sa_mask));
80    sa.sa_flags = SA_RESTART;
81    sa.sa_handler = release_vt;
82    sigaction(SIGUSR1, &sa, NULL);
83    sa.sa_handler = acquire_vt;
84    sigaction(SIGUSR2, &sa, NULL);
85
86    /* need to handle some signals so that we don't get killed by them */
87    sa.sa_handler = SIG_IGN;
88    sigaction(SIGHUP, &sa, NULL);
89    sigaction(SIGQUIT, &sa, NULL);
90    sigaction(SIGINT, &sa, NULL);
91    sigaction(SIGTSTP, &sa, NULL);
92
93    ovtm = vtm;
94    vtm.mode = VT_PROCESS;
95    vtm.relsig = SIGUSR1;
96    vtm.acqsig = SIGUSR2;
97    ioctl(vfd, VT_SETMODE, &vtm);
98
99    tcgetattr(STDIN_FILENO, &oterm);
100    term = oterm;
101    term.c_iflag &= ~BRKINT;
102    term.c_iflag |= IGNBRK;
103    term.c_lflag &= ~ISIG;
104    term.c_lflag &= ~(ECHO | ECHOCTL);
105    tcsetattr(STDIN_FILENO, TCSANOW, &term);
106
107    do {
108        printf("Virtual Console%s locked by %s.\n", (o_lock_all) ? "s" : "", pw->pw_name);
109        if (correct_password(pw)) {
110            break;
111        }
112        bb_do_delay(FAIL_DELAY);
113        puts("Password incorrect");
114    } while (1);
115    restore_terminal();
116    fflush_stdout_and_exit(0);
117}
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