1 /* $NetBSD: getpass.c,v 1.14 2000/01/22 22:19:11 mycroft 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 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)getpass.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: getpass.c,v 1.14 2000/01/22 22:19:11 mycroft Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 47 #include <assert.h> 48 #include <paths.h> 49 #include <pwd.h> 50 #include <signal.h> 51 #include <stdio.h> 52 #include <termios.h> 53 #include <unistd.h> 54 55 #ifdef __weak_alias 56 __weak_alias(getpass,_getpass) 57 #endif 58 59 char * 60 getpass(prompt) 61 const char *prompt; 62 { 63 struct termios term; 64 int ch; 65 char *p; 66 FILE *fp, *outfp; 67 int echo; 68 static char buf[_PASSWORD_LEN + 1]; 69 sigset_t oset, nset; 70 71 _DIAGASSERT(prompt != NULL); 72 73 /* 74 * read and write to /dev/tty if possible; else read from 75 * stdin and write to stderr. 76 */ 77 if ((outfp = fp = fopen(_PATH_TTY, "w+")) == NULL) { 78 outfp = stderr; 79 fp = stdin; 80 } 81 82 /* 83 * note - blocking signals isn't necessarily the 84 * right thing, but we leave it for now. 85 */ 86 sigemptyset(&nset); 87 sigaddset(&nset, SIGINT); 88 sigaddset(&nset, SIGTSTP); 89 (void)sigprocmask(SIG_BLOCK, &nset, &oset); 90 91 (void)tcgetattr(fileno(fp), &term); 92 if ((echo = (term.c_lflag & ECHO)) != 0) { 93 term.c_lflag &= ~ECHO; 94 (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term); 95 } 96 if (prompt != NULL) 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)sigprocmask(SIG_SETMASK, &oset, NULL); 109 if (fp != stdin) 110 (void)fclose(fp); 111 return(buf); 112 } 113