package/ead/src/tinysrp/t_getpass.c

   1 /*
   2  * Copyright 1990 - 1995, Julianne Frances Haugh
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include "t_defines.h"
  31 #ifdef _WIN32
  32 #include <windows.h>
  33 #include <io.h>
  34 #endif /* _WIN32 */
  35 #ifdef HAVE_UNISTD_H
  36 #include <unistd.h>
  37 #endif /* HAVE_UNISTD_H */
  38 #include <signal.h>
  39 #include <stdio.h>
  40
  41 static  int     sig_caught;
  42 #ifdef HAVE_SIGACTION
  43 static  struct  sigaction sigact;
  44 #endif
  45
  46 /*ARGSUSED*/
  47 static RETSIGTYPE
  48 sig_catch (sig)
  49 int     sig;
  50 {
  51         sig_caught = 1;
  52 }
  53
  54 _TYPE( int )
  55 t_getpass (buf, maxlen, prompt)
  56         char *buf;
  57         unsigned maxlen;
  58         const char *prompt;
  59 {
  60         char    *cp;
  61 #ifdef _WIN32
  62     HANDLE handle = (HANDLE) _get_osfhandle(_fileno(stdin));
  63     DWORD  mode;
  64
  65     GetConsoleMode( handle, &mode );
  66     SetConsoleMode( handle, mode & ~ENABLE_ECHO_INPUT );
  67
  68     if(fputs(prompt, stdout) == EOF ||
  69         fgets(buf, maxlen, stdin) == NULL) {
  70         SetConsoleMode(handle,mode);
  71         return -1;
  72     }
  73     cp = buf + strlen(buf) - 1;
  74     if ( *cp == 0x0a )
  75         *cp = '\0';
  76     printf("\n");
  77     SetConsoleMode(handle,mode);
  78 #else
  79         FILE    *fp;
  80         int     tty_opened = 0;
  81
  82 #ifdef HAVE_SIGACTION
  83         struct  sigaction old_sigact;
  84 #else
  85         RETSIGTYPE      (*old_signal)();
  86 #endif
  87         TERMIO  new_modes;
  88         TERMIO  old_modes;
  89
  90         /*
  91          * set a flag so the SIGINT signal can be re-sent if it
  92          * is caught
  93          */
  94
  95         sig_caught = 0;
  96
  97         /*
  98          * if /dev/tty can't be opened, getpass() needs to read
  99          * from stdin instead.
 100          */
 101
 102         if ((fp = fopen ("/dev/tty", "r")) == 0) {
 103                 fp = stdin;
 104                 setbuf (fp, (char *) 0);
 105         } else {
 106                 tty_opened = 1;
 107         }
 108
 109         /*
 110          * the current tty modes must be saved so they can be
 111          * restored later on.  echo will be turned off, except
 112          * for the newline character (BSD has to punt on this)
 113          */
 114
 115         if (GTTY (fileno (fp), &new_modes))
 116                 return -1;
 117
 118         old_modes = new_modes;
 119
 120 #ifdef HAVE_SIGACTION
 121         sigact.sa_handler = sig_catch;
 122         (void) sigaction (SIGINT, &sigact, &old_sigact);
 123 #else
 124         old_signal = signal (SIGINT, sig_catch);
 125 #endif
 126
 127 #ifdef USE_SGTTY
 128         new_modes.sg_flags &= ~ECHO;
 129 #else
 130         new_modes.c_iflag &= ~IGNCR;
 131         new_modes.c_iflag |= ICRNL;
 132         new_modes.c_oflag |= OPOST|ONLCR;
 133         new_modes.c_lflag &= ~(ECHO|ECHOE|ECHOK);
 134         new_modes.c_lflag |= ICANON|ECHONL;
 135 #endif
 136
 137         if (STTY (fileno (fp), &new_modes))
 138                 goto out;
 139
 140         /*
 141          * the prompt is output, and the response read without
 142          * echoing.  the trailing newline must be removed.  if
 143          * the fgets() returns an error, a NULL pointer is
 144          * returned.
 145          */
 146
 147         if (fputs (prompt, stdout) == EOF)
 148                 goto out;
 149
 150         (void) fflush (stdout);
 151
 152         if (fgets (buf, maxlen, fp) == buf) {
 153                 if ((cp = strchr (buf, '\n')))
 154                         *cp = '\0';
 155                 else
 156                         buf[maxlen - 1] = '\0';
 157
 158 #ifdef USE_SGTTY
 159                 putc ('\n', stdout);
 160 #endif
 161         }
 162         else buf[0] = '\0';
 163 out:
 164         /*
 165          * the old SIGINT handler is restored after the tty
 166          * modes.  then /dev/tty is closed if it was opened in
 167          * the beginning.  finally, if a signal was caught it
 168          * is sent to this process for normal processing.
 169          */
 170
 171         if (STTY (fileno (fp), &old_modes))
 172         { memset (buf, 0, maxlen); return -1; }
 173
 174 #ifdef HAVE_SIGACTION
 175         (void) sigaction (SIGINT, &old_sigact, NULL);
 176 #else
 177         (void) signal (SIGINT, old_signal);
 178 #endif
 179
 180         if (tty_opened)
 181                 (void) fclose (fp);
 182
 183         if (sig_caught) {
 184                 kill (getpid (), SIGINT);
 185                 memset (buf, 0, maxlen);
 186                 return -1;
 187         }
 188 #endif
 189
 190         return 0;
 191 }