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