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 2004 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29#include "libuutil_common.h"
30
31#include <string.h>
32
33/*
34 * We require names of the form:
35 *	[provider,]identifier[/[provider,]identifier]...
36 *
37 * Where provider is either a stock symbol (SUNW) or a java-style reversed
38 * domain name (com.sun).
39 *
40 * Both providers and identifiers must start with a letter, and may
41 * only contain alphanumerics, dashes, and underlines.  Providers
42 * may also contain periods.
43 *
44 * Note that we do _not_ use the macros in <ctype.h>, since they are affected
45 * by the current locale settings.
46 */
47
48#define	IS_ALPHA(c) \
49	(((c) >= 'a' && (c) <= 'z') || ((c) >= 'A' && (c) <= 'Z'))
50
51#define	IS_DIGIT(c) \
52	((c) >= '0' && (c) <= '9')
53
54static int
55is_valid_ident(const char *s, const char *e, int allowdot)
56{
57	char c;
58
59	if (s >= e)
60		return (0);		/* name is empty */
61
62	c = *s++;
63	if (!IS_ALPHA(c))
64		return (0);		/* does not start with letter */
65
66	while (s < e && (c = *s++) != 0) {
67		if (IS_ALPHA(c) || IS_DIGIT(c) || c == '-' || c == '_' ||
68		    (allowdot && c == '.'))
69			continue;
70		return (0);		/* invalid character */
71	}
72	return (1);
73}
74
75static int
76is_valid_component(const char *b, const char *e, uint_t flags)
77{
78	char *sp;
79
80	if (flags & UU_NAME_DOMAIN) {
81		sp = strchr(b, ',');
82		if (sp != NULL && sp < e) {
83			if (!is_valid_ident(b, sp, 1))
84				return (0);
85			b = sp + 1;
86		}
87	}
88
89	return (is_valid_ident(b, e, 0));
90}
91
92int
93uu_check_name(const char *name, uint_t flags)
94{
95	const char *end = name + strlen(name);
96	const char *p;
97
98	if (flags & ~(UU_NAME_DOMAIN | UU_NAME_PATH)) {
99		uu_set_error(UU_ERROR_UNKNOWN_FLAG);
100		return (-1);
101	}
102
103	if (!(flags & UU_NAME_PATH)) {
104		if (!is_valid_component(name, end, flags))
105			goto bad;
106		return (0);
107	}
108
109	while ((p = strchr(name, '/')) != NULL) {
110		if (!is_valid_component(name, p - 1, flags))
111			goto bad;
112		name = p + 1;
113	}
114	if (!is_valid_component(name, end, flags))
115		goto bad;
116
117	return (0);
118
119bad:
120	uu_set_error(UU_ERROR_INVALID_ARGUMENT);
121	return (-1);
122}
123