1 /* $NetBSD: getpass.c,v 1.15 2003/08/07 16:42:50 agc 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 #if 0
33 #include <sys/cdefs.h>
34 #if defined(LIBC_SCCS) && !defined(lint)
35 #if 0
36 static char sccsid[] = "@(#)getpass.c 8.1 (Berkeley) 6/4/93";
37 #else
38 __RCSID("$NetBSD: getpass.c,v 1.15 2003/08/07 16:42:50 agc Exp $");
39 #endif
40 #endif /* LIBC_SCCS and not lint */
41
42 #include "namespace.h"
43 #endif
44
45 #include <assert.h>
46 #include <paths.h>
47 #include <pwd.h>
48 #include <signal.h>
49 #include <stdio.h>
50 #include <termios.h>
51 #include <unistd.h>
52
53 #if 0
54 #ifdef __weak_alias
55 __weak_alias(getpass,_getpass)
56 #endif
57 #endif
58
59 char *
getpass(prompt)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 #if 0
72 _DIAGASSERT(prompt != NULL);
73 #endif
74
75 /*
76 * read and write to /dev/tty if possible; else read from
77 * stdin and write to stderr.
78 */
79 if ((outfp = fp = fopen(_PATH_TTY, "w+")) == NULL) {
80 outfp = stderr;
81 fp = stdin;
82 }
83
84 /*
85 * note - blocking signals isn't necessarily the
86 * right thing, but we leave it for now.
87 */
88 sigemptyset(&nset);
89 sigaddset(&nset, SIGINT);
90 sigaddset(&nset, SIGTSTP);
91 (void)sigprocmask(SIG_BLOCK, &nset, &oset);
92
93 (void)tcgetattr(fileno(fp), &term);
94 if ((echo = (term.c_lflag & ECHO)) != 0) {
95 term.c_lflag &= ~ECHO;
96 (void)tcsetattr(fileno(fp), TCSAFLUSH /*|TCSASOFT*/, &term);
97 }
98 if (prompt != NULL)
99 (void)fputs(prompt, outfp);
100 rewind(outfp); /* implied flush */
101 for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';)
102 if (p < buf + _PASSWORD_LEN)
103 *p++ = ch;
104 *p = '\0';
105 (void)write(fileno(outfp), "\n", 1);
106 if (echo) {
107 term.c_lflag |= ECHO;
108 (void)tcsetattr(fileno(fp), TCSAFLUSH/*|TCSASOFT*/, &term);
109 }
110 (void)sigprocmask(SIG_SETMASK, &oset, NULL);
111 if (fp != stdin)
112 (void)fclose(fp);
113 return(buf);
114 }
115