1 /* $NetBSD: getpass.c,v 1.9 1996/05/20 06:13:07 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 1.9 1996/05/20 06:13:07 jtc Exp $"; 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include <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 int echo; 61 static char buf[_PASSWORD_LEN + 1]; 62 sigset_t oset, nset; 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 /* 74 * note - blocking signals isn't necessarily the 75 * right thing, but we leave it for now. 76 */ 77 sigemptyset(&nset); 78 sigaddset(&nset, SIGINT); 79 sigaddset(&nset, SIGTSTP); 80 (void)sigprocmask(SIG_BLOCK, &nset, &oset); 81 82 (void)tcgetattr(fileno(fp), &term); 83 if (echo = (term.c_lflag & ECHO)) { 84 term.c_lflag &= ~ECHO; 85 (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term); 86 } 87 (void)fputs(prompt, outfp); 88 rewind(outfp); /* implied flush */ 89 for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';) 90 if (p < buf + _PASSWORD_LEN) 91 *p++ = ch; 92 *p = '\0'; 93 (void)write(fileno(outfp), "\n", 1); 94 if (echo) { 95 term.c_lflag |= ECHO; 96 (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term); 97 } 98 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 99 if (fp != stdin) 100 (void)fclose(fp); 101 return(buf); 102 } 103