1 // SPDX-License-Identifier: CDDL-1.0
2 /*
3 * CDDL HEADER START
4 *
5 * The contents of this file are subject to the terms of the
6 * Common Development and Distribution License, Version 1.0 only
7 * (the "License"). You may not use this file except in compliance
8 * with the License.
9 *
10 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
11 * or https://opensource.org/licenses/CDDL-1.0.
12 * See the License for the specific language governing permissions
13 * and limitations under the License.
14 *
15 * When distributing Covered Code, include this CDDL HEADER in each
16 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
17 * If applicable, add the following below this CDDL HEADER, with the
18 * fields enclosed by brackets "[]" replaced with your own identifying
19 * information: Portions Copyright [yyyy] [name of copyright owner]
20 *
21 * CDDL HEADER END
22 */
23 /*
24 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
25 * Use is subject to license terms.
26 */
27
28
29
30 #include "libuutil_common.h"
31
32 #include <string.h>
33
34 /*
35 * We require names of the form:
36 * [provider,]identifier[/[provider,]identifier]...
37 *
38 * Where provider is either a stock symbol (SUNW) or a java-style reversed
39 * domain name (com.sun).
40 *
41 * Both providers and identifiers must start with a letter, and may
42 * only contain alphanumerics, dashes, and underlines. Providers
43 * may also contain periods.
44 *
45 * Note that we do _not_ use the macros in <ctype.h>, since they are affected
46 * by the current locale settings.
47 */
48
49 #define IS_ALPHA(c) \
50 (((c) >= 'a' && (c) <= 'z') || ((c) >= 'A' && (c) <= 'Z'))
51
52 #define IS_DIGIT(c) \
53 ((c) >= '0' && (c) <= '9')
54
55 static int
is_valid_ident(const char * s,const char * e,int allowdot)56 is_valid_ident(const char *s, const char *e, int allowdot)
57 {
58 char c;
59
60 if (s >= e)
61 return (0); /* name is empty */
62
63 c = *s++;
64 if (!IS_ALPHA(c))
65 return (0); /* does not start with letter */
66
67 while (s < e && (c = *s++) != 0) {
68 if (IS_ALPHA(c) || IS_DIGIT(c) || c == '-' || c == '_' ||
69 (allowdot && c == '.'))
70 continue;
71 return (0); /* invalid character */
72 }
73 return (1);
74 }
75
76 static int
is_valid_component(const char * b,const char * e,uint_t flags)77 is_valid_component(const char *b, const char *e, uint_t flags)
78 {
79 char *sp;
80
81 if (flags & UU_NAME_DOMAIN) {
82 sp = strchr(b, ',');
83 if (sp != NULL && sp < e) {
84 if (!is_valid_ident(b, sp, 1))
85 return (0);
86 b = sp + 1;
87 }
88 }
89
90 return (is_valid_ident(b, e, 0));
91 }
92
93 int
uu_check_name(const char * name,uint_t flags)94 uu_check_name(const char *name, uint_t flags)
95 {
96 const char *end = name + strlen(name);
97 const char *p;
98
99 if (flags & ~(UU_NAME_DOMAIN | UU_NAME_PATH)) {
100 uu_set_error(UU_ERROR_UNKNOWN_FLAG);
101 return (-1);
102 }
103
104 if (!(flags & UU_NAME_PATH)) {
105 if (!is_valid_component(name, end, flags))
106 goto bad;
107 return (0);
108 }
109
110 while ((p = strchr(name, '/')) != NULL) {
111 if (!is_valid_component(name, p - 1, flags))
112 goto bad;
113 name = p + 1;
114 }
115 if (!is_valid_component(name, end, flags))
116 goto bad;
117
118 return (0);
119
120 bad:
121 uu_set_error(UU_ERROR_INVALID_ARGUMENT);
122 return (-1);
123 }
124