1 /* $NetBSD: getpass.c,v 1.10 1997/07/13 19:13:01 christos 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 1.10 1997/07/13 19:13:01 christos Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include <termios.h> 46 #include <signal.h> 47 48 #include <paths.h> 49 #include <pwd.h> 50 #include <stdio.h> 51 #include <unistd.h> 52 53 char * 54 getpass(prompt) 55 const char *prompt; 56 { 57 struct termios term; 58 register int ch; 59 register char *p; 60 FILE *fp, *outfp; 61 int echo; 62 static char buf[_PASSWORD_LEN + 1]; 63 sigset_t oset, nset; 64 65 /* 66 * read and write to /dev/tty if possible; else read from 67 * stdin and write to stderr. 68 */ 69 if ((outfp = fp = fopen(_PATH_TTY, "w+")) == NULL) { 70 outfp = stderr; 71 fp = stdin; 72 } 73 74 /* 75 * note - blocking signals isn't necessarily the 76 * right thing, but we leave it for now. 77 */ 78 sigemptyset(&nset); 79 sigaddset(&nset, SIGINT); 80 sigaddset(&nset, SIGTSTP); 81 (void)sigprocmask(SIG_BLOCK, &nset, &oset); 82 83 (void)tcgetattr(fileno(fp), &term); 84 if ((echo = (term.c_lflag & ECHO)) != 0) { 85 term.c_lflag &= ~ECHO; 86 (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term); 87 } 88 (void)fputs(prompt, outfp); 89 rewind(outfp); /* implied flush */ 90 for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';) 91 if (p < buf + _PASSWORD_LEN) 92 *p++ = ch; 93 *p = '\0'; 94 (void)write(fileno(outfp), "\n", 1); 95 if (echo) { 96 term.c_lflag |= ECHO; 97 (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term); 98 } 99 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 100 if (fp != stdin) 101 (void)fclose(fp); 102 return(buf); 103 } 104