1 /* 2 * Copyright (c) 1988 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 /*static char *sccsid = "from: @(#)getpass.c 5.9 (Berkeley) 5/6/91";*/ 36 static char *rcsid = "$Id: getpass.c,v 1.4 1994/01/04 18:27:08 jtc Exp $"; 37 #endif /* LIBC_SCCS and not lint */ 38 39 #include <sys/termios.h> 40 #include <sys/signal.h> 41 #include <stdio.h> 42 #include <unistd.h> 43 #include <pwd.h> 44 #include <paths.h> 45 46 char * 47 getpass(prompt) 48 const char *prompt; 49 { 50 struct termios term; 51 register int ch; 52 register char *p; 53 FILE *fp, *outfp; 54 long omask; 55 int echo; 56 static char buf[_PASSWORD_LEN + 1]; 57 58 /* 59 * read and write to /dev/tty if possible; else read from 60 * stdin and write to stderr. 61 */ 62 if ((outfp = fp = fopen(_PATH_TTY, "w+")) == NULL) { 63 outfp = stderr; 64 fp = stdin; 65 } 66 /* 67 * note - blocking signals isn't necessarily the 68 * right thing, but we leave it for now. 69 */ 70 omask = sigblock(sigmask(SIGINT)|sigmask(SIGTSTP)); 71 (void)tcgetattr(fileno(fp), &term); 72 if (echo = (term.c_lflag & ECHO)) { 73 term.c_lflag &= ~ECHO; 74 (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term); 75 } 76 (void)fputs(prompt, outfp); 77 rewind(outfp); /* implied flush */ 78 for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';) 79 if (p < buf + _PASSWORD_LEN) 80 *p++ = ch; 81 *p = '\0'; 82 (void)write(fileno(outfp), "\n", 1); 83 if (echo) { 84 term.c_lflag |= ECHO; 85 tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term); 86 } 87 (void)sigsetmask(omask); 88 if (fp != stdin) 89 (void)fclose(fp); 90 return(buf); 91 } 92