1 /* $NetBSD: getpass.c,v 1.16 2008/01/01 21:22:55 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)getpass.c 8.1 (Berkeley) 6/4/93"; 36 #else 37 __RCSID("$NetBSD: getpass.c,v 1.16 2008/01/01 21:22:55 christos Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 43 #include <assert.h> 44 #include <paths.h> 45 #include <pwd.h> 46 #include <signal.h> 47 #include <stdio.h> 48 #include <termios.h> 49 #include <unistd.h> 50 51 #ifdef __weak_alias 52 __weak_alias(getpass,_getpass) 53 #endif 54 55 char * 56 getpass(prompt) 57 const char *prompt; 58 { 59 struct termios term; 60 int ch; 61 char *p; 62 FILE *fp, *outfp; 63 int echo; 64 static char buf[_PASSWORD_LEN + 1]; 65 sigset_t oset, nset; 66 67 _DIAGASSERT(prompt != NULL); 68 69 /* 70 * note - blocking signals isn't necessarily the 71 * right thing, but we leave it for now. 72 */ 73 sigemptyset(&nset); 74 sigaddset(&nset, SIGINT); 75 sigaddset(&nset, SIGTSTP); 76 (void)sigprocmask(SIG_BLOCK, &nset, &oset); 77 78 /* 79 * read and write to /dev/tty if possible; else read from 80 * stdin and write to stderr. 81 */ 82 if ((outfp = fp = fopen(_PATH_TTY, "w+")) == NULL) { 83 outfp = stderr; 84 fp = stdin; 85 } 86 (void)tcgetattr(fileno(fp), &term); 87 if ((echo = (term.c_lflag & ECHO)) != 0) { 88 term.c_lflag &= ~ECHO; 89 (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term); 90 } 91 if (prompt != NULL) 92 (void)fputs(prompt, outfp); 93 rewind(outfp); /* implied flush */ 94 for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';) 95 if (p < buf + _PASSWORD_LEN) 96 *p++ = ch; 97 *p = '\0'; 98 (void)write(fileno(outfp), "\n", 1); 99 if (echo) { 100 term.c_lflag |= ECHO; 101 (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term); 102 } 103 if (fp != stdin) 104 (void)fclose(fp); 105 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 106 return(buf); 107 } 108