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, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright (c) 1997, by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30
31#pragma ident	"%Z%%M%	%I%	%E% SMI"	/* SVr4.0 1.3 */
32
33/*LINTLIBRARY*/
34
35#include	<sys/types.h>
36#include	<stdio.h>
37#include	<ctype.h>
38#include	<userdefs.h>
39#include	<users.h>
40#include	<limits.h>
41
42/*
43 * validate string given as login name.
44 */
45int
46valid_login(char *login, struct passwd **pptr, int *warning)
47{
48	struct passwd *t_pptr;
49	char *ptr = login;
50	int bad1char, badc, clower, len;
51	char c;
52
53	len = 0; clower = 0; badc = 0; bad1char = 0;
54	*warning = 0;
55	if (!login || !*login)
56		return (INVALID);
57
58	c = *ptr;
59	if (!isalpha(c))
60		bad1char++;
61	for (; c != NULL; ptr++, c = *ptr) {
62		len++;
63		if (!isprint(c) || (c == ':') || (c == '\n'))
64			return (INVALID);
65		if (!isalnum(c) && c != '_' && c != '-' && c != '.')
66			badc++;
67		if (islower(c))
68			clower++;
69	}
70
71	/*
72	 * XXX length checking causes some operational/compatibility problem.
73	 * This has to be revisited in the future as ARC/standards issue.
74	 */
75	if (len > LOGNAME_MAX)
76		*warning = *warning | WARN_NAME_TOO_LONG;
77	if (clower == 0)
78		*warning = *warning | WARN_NO_LOWERCHAR;
79	if (badc != 0)
80		*warning = *warning | WARN_BAD_LOGNAME_CHAR;
81	if (bad1char != 0)
82		*warning = *warning | WARN_BAD_LOGNAME_FIRST;
83
84	if ((t_pptr = getpwnam(login)) != NULL) {
85		if (pptr) *pptr = t_pptr;
86		return (NOTUNIQUE);
87	}
88	return (UNIQUE);
89}
90