gen/getpass.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1988, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58
  59 #include <sys/termios.h>
  60 #include <sys/signal.h>
  61
  62 #include <paths.h>
  63 #include <pwd.h>
  64 #include <stdio.h>
  65 #include <unistd.h>
  66
  67 char *
  68 getpass(prompt)
  69         const char *prompt;
  70 {
  71         struct termios term;
  72         register int ch;
  73         register char *p;
  74         FILE *fp, *outfp;
  75         long omask;
  76         int echo;
  77         static char buf[_PASSWORD_LEN + 1];
  78
  79         /*
  80          * read and write to /dev/tty if possible; else read from
  81          * stdin and write to stderr.
  82          */
  83         if ((outfp = fp = fopen(_PATH_TTY, "w+")) == NULL) {
  84                 outfp = stderr;
  85                 fp = stdin;
  86         }
  87         /*
  88          * note - blocking signals isn't necessarily the
  89          * right thing, but we leave it for now.
  90          */
  91         omask = sigblock(sigmask(SIGINT)|sigmask(SIGTSTP));
  92         (void)tcgetattr(fileno(fp), &term);
  93         if (echo = (term.c_lflag & ECHO)) {
  94                 term.c_lflag &= ~ECHO;
  95                 (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
  96         }
  97         (void)fputs(prompt, outfp);
  98         rewind(outfp);                  /* implied flush */
  99         for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';)
 100                 if (p < buf + _PASSWORD_LEN)
 101                         *p++ = ch;
 102         *p = '\0';
 103         (void)write(fileno(outfp), "\n", 1);
 104         if (echo) {
 105                 term.c_lflag |= ECHO;
 106                 (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
 107         }
 108         (void)sigsetmask(omask);
 109         if (fp != stdin)
 110                 (void)fclose(fp);
 111         return(buf);
 112 }