source/lib/replace/getpass.c

   1 /* Copyright (C) 1992-1998 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 /* Modified to use with samba by Jeremy Allison, 8th July 1995. */
  20
  21 #include "replace.h"
  22
  23 #if defined(HAVE_TERMIOS_H)
  24 /* POSIX terminal handling. */
  25 #include <termios.h>
  26 #elif defined(HAVE_TERMIO_H)
  27 /* Older SYSV terminal handling - don't use if we can avoid it. */
  28 #include <termio.h>
  29 #elif defined(HAVE_SYS_TERMIO_H)
  30 /* Older SYSV terminal handling - don't use if we can avoid it. */
  31 #include <sys/termio.h>
  32 #endif
  33
  34 #ifdef HAVE_SYS_WAIT_H
  35 #include <sys/wait.h>
  36 #endif
  37
  38 /*
  39  * Define additional missing types
  40  */
  41 #ifndef HAVE_SIG_ATOMIC_T_TYPE
  42 typedef int sig_atomic_t;
  43 #endif
  44
  45 #ifndef SIGCLD
  46 #define SIGCLD SIGCHLD
  47 #endif
  48
  49 #ifndef SIGNAL_CAST
  50 #define SIGNAL_CAST (RETSIGTYPE (*)(int))
  51 #endif
  52
  53 #ifdef REPLACE_GETPASS
  54
  55 #ifdef SYSV_TERMIO
  56
  57 /* SYSTEM V TERMIO HANDLING */
  58
  59 static struct termio t;
  60
  61 #define ECHO_IS_ON(t) ((t).c_lflag & ECHO)
  62 #define TURN_ECHO_OFF(t) ((t).c_lflag &= ~ECHO)
  63 #define TURN_ECHO_ON(t) ((t).c_lflag |= ECHO)
  64
  65 #ifndef TCSAFLUSH
  66 #define TCSAFLUSH 1
  67 #endif
  68
  69 #ifndef TCSANOW
  70 #define TCSANOW 0
  71 #endif
  72
  73 static int tcgetattr(int fd, struct termio *_t)
  74 {
  75         return ioctl(fd, TCGETA, _t);
  76 }
  77
  78 static int tcsetattr(int fd, int flags, struct termio *_t)
  79 {
  80         if(flags & TCSAFLUSH)
  81                 ioctl(fd, TCFLSH, TCIOFLUSH);
  82         return ioctl(fd, TCSETS, _t);
  83 }
  84
  85 #elif !defined(TCSAFLUSH)
  86
  87 /* BSD TERMIO HANDLING */
  88
  89 static struct sgttyb t;
  90
  91 #define ECHO_IS_ON(t) ((t).sg_flags & ECHO)
  92 #define TURN_ECHO_OFF(t) ((t).sg_flags &= ~ECHO)
  93 #define TURN_ECHO_ON(t) ((t).sg_flags |= ECHO)
  94
  95 #define TCSAFLUSH 1
  96 #define TCSANOW 0
  97
  98 static int tcgetattr(int fd, struct sgttyb *_t)
  99 {
 100         return ioctl(fd, TIOCGETP, (char *)_t);
 101 }
 102
 103 static int tcsetattr(int fd, int flags, struct sgttyb *_t)
 104 {
 105         return ioctl(fd, TIOCSETP, (char *)_t);
 106 }
 107
 108 #else /* POSIX TERMIO HANDLING */
 109 #define ECHO_IS_ON(t) ((t).c_lflag & ECHO)
 110 #define TURN_ECHO_OFF(t) ((t).c_lflag &= ~ECHO)
 111 #define TURN_ECHO_ON(t) ((t).c_lflag |= ECHO)
 112
 113 static struct termios t;
 114 #endif /* SYSV_TERMIO */
 115
 116 static void catch_signal(int signum,void (*handler)(int ))
 117 {
 118 #ifdef HAVE_SIGACTION
 119         struct sigaction act;
 120         struct sigaction oldact;
 121
 122         memset(&act, 0, sizeof(act));
 123
 124         act.sa_handler = handler;
 125 #ifdef SA_RESTART
 126         /*
 127          * We *want* SIGALRM to interrupt a system call.
 128          */
 129         if(signum != SIGALRM)
 130                 act.sa_flags = SA_RESTART;
 131 #endif
 132         sigemptyset(&act.sa_mask);
 133         sigaddset(&act.sa_mask,signum);
 134         sigaction(signum,&act,&oldact);
 135         return oldact.sa_handler;
 136 #else /* !HAVE_SIGACTION */
 137         /* FIXME: need to handle sigvec and systems with broken signal() */
 138         return signal(signum, handler);
 139 #endif
 140 }
 141
 142 char *getsmbpass(const char *prompt)
 143 {
 144   FILE *in, *out;
 145   int echo_off;
 146   static char buf[256];
 147   static size_t bufsize = sizeof(buf);
 148   size_t nread;
 149
 150   /* Catch problematic signals */
 151   catch_signal(SIGINT, SIGNAL_CAST SIG_IGN);
 152
 153   /* Try to write to and read from the terminal if we can.
 154      If we can't open the terminal, use stderr and stdin.  */
 155
 156   in = fopen ("/dev/tty", "w+");
 157   if (in == NULL)
 158     {
 159       in = stdin;
 160       out = stderr;
 161     }
 162   else
 163     out = in;
 164
 165   setvbuf(in, NULL, _IONBF, 0);
 166
 167   /* Turn echoing off if it is on now.  */
 168
 169   if (tcgetattr (fileno (in), &t) == 0)
 170     {
 171           if (ECHO_IS_ON(t))
 172         {
 173                 TURN_ECHO_OFF(t);
 174                 echo_off = tcsetattr (fileno (in), TCSAFLUSH, &t) == 0;
 175                 TURN_ECHO_ON(t);
 176         }
 177       else
 178         echo_off = 0;
 179     }
 180   else
 181     echo_off = 0;
 182
 183   /* Write the prompt.  */
 184   fputs (prompt, out);
 185   fflush (out);
 186
 187   /* Read the password.  */
 188   buf[0] = 0;
 189   fgets(buf, bufsize, in);
 190   nread = strlen(buf);
 191   if (buf[nread - 1] == '\n')
 192     buf[nread - 1] = '\0';
 193
 194   /* Restore echoing.  */
 195   if (echo_off)
 196     (void) tcsetattr (fileno (in), TCSANOW, &t);
 197
 198   if (in != stdin)
 199     /* We opened the terminal; now close it.  */
 200     fclose (in);
 201
 202   /* Catch problematic signals */
 203   catch_signal(SIGINT, SIGNAL_CAST SIG_DFL);
 204
 205   printf("\n");
 206   return buf;
 207 }
 208
 209 #else
 210  void getsmbpasswd_dummy(void);
 211  void getsmbpasswd_dummy(void) {;}
 212 #endif