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    Contents of /trunk/mkinitrd-magellan/busybox/loginutils/vlock.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
    File MIME type: text/plain
    File size: 2688 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    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 "busybox.h"
    20 #include <sys/vt.h>
    21
    22 static struct passwd *pw;
    23 static struct vt_mode ovtm;
    24 static struct termios oterm;
    25 static int vfd;
    26 static unsigned long o_lock_all;
    27
    28 static void release_vt(int signo)
    29 {
    30 ioctl(vfd, VT_RELDISP, !o_lock_all);
    31 }
    32
    33 static void acquire_vt(int signo)
    34 {
    35 ioctl(vfd, VT_RELDISP, VT_ACKACQ);
    36 }
    37
    38 static void restore_terminal(void)
    39 {
    40 ioctl(vfd, VT_SETMODE, &ovtm);
    41 tcsetattr(STDIN_FILENO, TCSANOW, &oterm);
    42 }
    43
    44 int vlock_main(int argc, char **argv)
    45 {
    46 sigset_t sig;
    47 struct sigaction sa;
    48 struct vt_mode vtm;
    49 struct termios term;
    50 uid_t uid = getuid();
    51
    52 pw = getpwuid(uid);
    53 if (pw == NULL)
    54 bb_error_msg_and_die("unknown uid %d", uid);
    55
    56 if (argc > 2) {
    57 bb_show_usage();
    58 }
    59
    60 o_lock_all = getopt32(argc, argv, "a");
    61
    62 vfd = xopen(CURRENT_TTY, O_RDWR);
    63
    64 if (ioctl(vfd, VT_GETMODE, &vtm) < 0) {
    65 bb_perror_msg_and_die("VT_GETMODE");
    66 }
    67
    68 /* mask a bunch of signals */
    69 sigprocmask(SIG_SETMASK, NULL, &sig);
    70 sigdelset(&sig, SIGUSR1);
    71 sigdelset(&sig, SIGUSR2);
    72 sigaddset(&sig, SIGTSTP);
    73 sigaddset(&sig, SIGTTIN);
    74 sigaddset(&sig, SIGTTOU);
    75 sigaddset(&sig, SIGHUP);
    76 sigaddset(&sig, SIGCHLD);
    77 sigaddset(&sig, SIGQUIT);
    78 sigaddset(&sig, SIGINT);
    79
    80 sigemptyset(&(sa.sa_mask));
    81 sa.sa_flags = SA_RESTART;
    82 sa.sa_handler = release_vt;
    83 sigaction(SIGUSR1, &sa, NULL);
    84 sa.sa_handler = acquire_vt;
    85 sigaction(SIGUSR2, &sa, NULL);
    86
    87 /* need to handle some signals so that we don't get killed by them */
    88 sa.sa_handler = SIG_IGN;
    89 sigaction(SIGHUP, &sa, NULL);
    90 sigaction(SIGQUIT, &sa, NULL);
    91 sigaction(SIGINT, &sa, NULL);
    92 sigaction(SIGTSTP, &sa, NULL);
    93
    94 ovtm = vtm;
    95 vtm.mode = VT_PROCESS;
    96 vtm.relsig = SIGUSR1;
    97 vtm.acqsig = SIGUSR2;
    98 ioctl(vfd, VT_SETMODE, &vtm);
    99
    100 tcgetattr(STDIN_FILENO, &oterm);
    101 term = oterm;
    102 term.c_iflag &= ~BRKINT;
    103 term.c_iflag |= IGNBRK;
    104 term.c_lflag &= ~ISIG;
    105 term.c_lflag &= ~(ECHO | ECHOCTL);
    106 tcsetattr(STDIN_FILENO, TCSANOW, &term);
    107
    108 do {
    109 printf("Virtual Console%s locked by %s.\n", (o_lock_all) ? "s" : "", pw->pw_name);
    110 if (correct_password(pw)) {
    111 break;
    112 }
    113 bb_do_delay(FAIL_DELAY);
    114 puts("Password incorrect");
    115 } while (1);
    116 restore_terminal();
    117 fflush_stdout_and_exit(0);
    118 }