getpass.c revision 4199:9940d79cb3e0 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#pragma ident	"%Z%%M%	%I%	%E% SMI"
27
28/*	Copyright (c) 1988 AT&T	*/
29/*	  All Rights Reserved  	*/
30
31
32#pragma weak getpass = _getpass
33#pragma weak getpassphrase = _getpassphrase
34
35#include "synonyms.h"
36#include "file64.h"
37#include "mtlib.h"
38#include <stdio.h>
39#include <sys/types.h>
40#include <signal.h>
41#include <unistd.h>
42#include <stropts.h>
43#include <termio.h>
44#include <thread.h>
45#include <synch.h>
46#include "libc.h"
47#include "stdiom.h"
48#include "tsd.h"
49
50static int intrupt;
51static char *__getpass(const char *, int);
52
53#define	MAXPASSWD	256	/* max significant characters in password */
54#define	SMLPASSWD	8	/* unix standard  characters in password */
55
56
57char *
58getpass(const char *prompt)
59{
60	return ((char *)__getpass(prompt, SMLPASSWD));
61}
62
63char *
64getpassphrase(const char *prompt)
65{
66	return ((char *)__getpass(prompt, MAXPASSWD));
67}
68
69static char *
70__getpass(const char *prompt, int size)
71{
72	struct termio ttyb;
73	unsigned short flags;
74	char *p;
75	int c;
76	FILE	*fi;
77	char *pbuf = tsdalloc(_T_GETPASS, MAXPASSWD + 1, NULL);
78	struct sigaction act, osigint, osigtstp;
79	static void catch(int);
80
81	if (pbuf == NULL ||
82	    (fi = fopen("/dev/tty", "r+F")) == NULL)
83		return (NULL);
84	setbuf(fi, NULL);
85
86	intrupt = 0;
87	act.sa_flags = 0;
88	act.sa_handler = catch;
89	(void) sigemptyset(&act.sa_mask);
90	(void) sigaction(SIGINT, &act, &osigint);	/* trap interrupt */
91	act.sa_handler = SIG_IGN;
92	(void) sigaction(SIGTSTP, &act, &osigtstp);	/* ignore stop */
93	(void) ioctl(fileno(fi), TCGETA, &ttyb);
94	flags = ttyb.c_lflag;
95	ttyb.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
96	(void) ioctl(fileno(fi), TCSETAF, &ttyb);
97
98	(void) fputs(prompt, fi);
99	p = pbuf;
100	while (!intrupt &&
101		(c = GETC(fi)) != '\n' && c != '\r' && c != EOF) {
102		if (p < &pbuf[ size ])
103			*p++ = (char)c;
104	}
105	*p = '\0';
106	(void) PUTC('\n', fi);
107
108	ttyb.c_lflag = flags;
109	(void) ioctl(fileno(fi), TCSETAW, &ttyb);
110	(void) sigaction(SIGINT, &osigint, NULL);
111	(void) sigaction(SIGTSTP, &osigtstp, NULL);
112	(void) fclose(fi);
113	if (intrupt) {		/* if interrupted erase the input */
114		pbuf[0] = '\0';
115		(void) kill(getpid(), SIGINT);
116	}
117	return (pbuf);
118}
119
120/* ARGSUSED */
121static void
122catch(int x)
123{
124	intrupt = 1;
125}
126