source: branches/2.2.2/mindi-busybox/loginutils/vlock.c @ 1247

Last change on this file since 1247 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 2.8 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 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 <stdio.h>
19#include <stdlib.h>
20#include <sys/vt.h>
21#include <signal.h>
22#include <string.h>
23#include <unistd.h>
24#include <fcntl.h>
25#include <errno.h>
26#include <sys/ioctl.h>
27#include <termios.h>
28
29#include "busybox.h"
30
31static struct passwd *pw;
32static struct vt_mode ovtm;
33static struct termios oterm;
34static int vfd;
35static unsigned long o_lock_all;
36
37static void release_vt(int signo)
38{
39    if (!o_lock_all)
40        ioctl(vfd, VT_RELDISP, 1);
41    else
42        ioctl(vfd, VT_RELDISP, 0);
43}
44
45static void acquire_vt(int signo)
46{
47    ioctl(vfd, VT_RELDISP, VT_ACKACQ);
48}
49
50static void restore_terminal(void)
51{
52    ioctl(vfd, VT_SETMODE, &ovtm);
53    tcsetattr(STDIN_FILENO, TCSANOW, &oterm);
54}
55
56int vlock_main(int argc, char **argv)
57{
58    sigset_t sig;
59    struct sigaction sa;
60    struct vt_mode vtm;
61    struct termios term;
62
63    if (argc > 2) {
64        bb_show_usage();
65    }
66
67    o_lock_all = bb_getopt_ulflags (argc, argv, "a");
68
69    if((pw = getpwuid(getuid())) == NULL) {
70        bb_error_msg_and_die("Unknown uid %d", getuid());
71    }
72
73    vfd = bb_xopen(CURRENT_TTY, O_RDWR);
74
75    if (ioctl(vfd, VT_GETMODE, &vtm) < 0) {
76        bb_perror_msg_and_die("VT_GETMODE");
77    }
78
79    /* mask a bunch of signals */
80    sigprocmask(SIG_SETMASK, NULL, &sig);
81    sigdelset(&sig, SIGUSR1);
82    sigdelset(&sig, SIGUSR2);
83    sigaddset(&sig, SIGTSTP);
84    sigaddset(&sig, SIGTTIN);
85    sigaddset(&sig, SIGTTOU);
86    sigaddset(&sig, SIGHUP);
87    sigaddset(&sig, SIGCHLD);
88    sigaddset(&sig, SIGQUIT);
89    sigaddset(&sig, SIGINT);
90
91    sigemptyset(&(sa.sa_mask));
92    sa.sa_flags = SA_RESTART;
93    sa.sa_handler = release_vt;
94    sigaction(SIGUSR1, &sa, NULL);
95    sa.sa_handler = acquire_vt;
96    sigaction(SIGUSR2, &sa, NULL);
97
98    /* need to handle some signals so that we don't get killed by them */
99    sa.sa_handler = SIG_IGN;
100    sigaction(SIGHUP, &sa, NULL);
101    sigaction(SIGQUIT, &sa, NULL);
102    sigaction(SIGINT, &sa, NULL);
103    sigaction(SIGTSTP, &sa, NULL);
104
105    ovtm = vtm;
106    vtm.mode = VT_PROCESS;
107    vtm.relsig = SIGUSR1;
108    vtm.acqsig = SIGUSR2;
109    ioctl(vfd, VT_SETMODE, &vtm);
110
111    tcgetattr(STDIN_FILENO, &oterm);
112    term = oterm;
113    term.c_iflag &= ~BRKINT;
114    term.c_iflag |= IGNBRK;
115    term.c_lflag &= ~ISIG;
116    term.c_lflag &= ~(ECHO | ECHOCTL);
117    tcsetattr(STDIN_FILENO, TCSANOW, &term);
118
119    do {
120        printf("Virtual Console%s locked.\n%s's ", (o_lock_all) ? "s" : "", pw->pw_name);
121        fflush(stdout);
122        if (correct_password (pw)) {
123            break;
124        }
125        bb_do_delay(FAIL_DELAY);
126        puts("Password incorrect.");
127    } while (1);
128    restore_terminal();
129    return 0;
130}
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