1 /* $NetBSD: getpass.c,v 1.6 1995/02/28 01:13:50 jtc Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)getpass.c 8.1 (Berkeley) 6/4/93"; 39 #else 40 static char rcsid[] = "$NetBSD: getpass.c,v 1.6 1995/02/28 01:13:50 jtc Exp $"; 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include <sys/termios.h> 45 #include <signal.h> 46 47 #include <paths.h> 48 #include <pwd.h> 49 #include <stdio.h> 50 #include <unistd.h> 51 52 char * 53 getpass(prompt) 54 const char *prompt; 55 { 56 struct termios term; 57 register int ch; 58 register char *p; 59 FILE *fp, *outfp; 60 long omask; 61 int echo; 62 static char buf[_PASSWORD_LEN + 1]; 63 64 /* 65 * read and write to /dev/tty if possible; else read from 66 * stdin and write to stderr. 67 */ 68 if ((outfp = fp = fopen(_PATH_TTY, "w+")) == NULL) { 69 outfp = stderr; 70 fp = stdin; 71 } 72 /* 73 * note - blocking signals isn't necessarily the 74 * right thing, but we leave it for now. 75 */ 76 omask = sigblock(sigmask(SIGINT)|sigmask(SIGTSTP)); 77 (void)tcgetattr(fileno(fp), &term); 78 if (echo = (term.c_lflag & ECHO)) { 79 term.c_lflag &= ~ECHO; 80 (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term); 81 } 82 (void)fputs(prompt, outfp); 83 rewind(outfp); /* implied flush */ 84 for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';) 85 if (p < buf + _PASSWORD_LEN) 86 *p++ = ch; 87 *p = '\0'; 88 (void)write(fileno(outfp), "\n", 1); 89 if (echo) { 90 term.c_lflag |= ECHO; 91 (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term); 92 } 93 (void)sigsetmask(omask); 94 if (fp != stdin) 95 (void)fclose(fp); 96 return(buf); 97 } 98