gen/getpass.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1988, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. All advertising materials mentioning features or use of this software
  35  *    must display the following acknowledgement:
  36  *      This product includes software developed by the University of
  37  *      California, Berkeley and its contributors.
  38  * 4. Neither the name of the University nor the names of its contributors
  39  *    may be used to endorse or promote products derived from this software
  40  *    without specific prior written permission.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  43  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  44  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  45  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  46  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  47  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  48  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  50  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  51  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  52  * SUCH DAMAGE.
  53  */
  54
  55
  56 #include <sys/termios.h>
  57 #include <sys/signal.h>
  58
  59 #include <paths.h>
  60 #include <pwd.h>
  61 #include <stdio.h>
  62 #include <unistd.h>
  63
  64 char *
  65 getpass(prompt)
  66         const char *prompt;
  67 {
  68         struct termios term;
  69         register int ch;
  70         register char *p;
  71         FILE *fp, *outfp;
  72         long omask;
  73         int echo;
  74         static char buf[_PASSWORD_LEN + 1];
  75
  76         /*
  77          * read and write to /dev/tty if possible; else read from
  78          * stdin and write to stderr.
  79          */
  80         if ((outfp = fp = fopen(_PATH_TTY, "w+")) == NULL) {
  81                 outfp = stderr;
  82                 fp = stdin;
  83         }
  84         /*
  85          * note - blocking signals isn't necessarily the
  86          * right thing, but we leave it for now.
  87          */
  88         omask = sigblock(sigmask(SIGINT)|sigmask(SIGTSTP));
  89         (void)tcgetattr(fileno(fp), &term);
  90         if (echo = (term.c_lflag & ECHO)) {
  91                 term.c_lflag &= ~ECHO;
  92                 (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
  93         }
  94         (void)fputs(prompt, outfp);
  95         rewind(outfp);                  /* implied flush */
  96         for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';)
  97                 if (p < buf + _PASSWORD_LEN)
  98                         *p++ = ch;
  99         *p = '\0';
 100         (void)write(fileno(outfp), "\n", 1);
 101         if (echo) {
 102                 term.c_lflag |= ECHO;
 103                 (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
 104         }
 105         (void)sigsetmask(omask);
 106         if (fp != stdin)
 107                 (void)fclose(fp);
 108         return(buf);
 109 }