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28f540f4 | 1 | /* |
28f540f4 RM |
2 | * Copyright (c) 1985, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
fa0bc87c | 4 | * |
28f540f4 RM |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
28f540f4 RM |
13 | * 4. Neither the name of the University nor the names of its contributors |
14 | * may be used to endorse or promote products derived from this software | |
15 | * without specific prior written permission. | |
fa0bc87c | 16 | * |
28f540f4 RM |
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. | |
28 | * - | |
29 | * Portions Copyright (c) 1993 by Digital Equipment Corporation. | |
fa0bc87c | 30 | * |
28f540f4 RM |
31 | * Permission to use, copy, modify, and distribute this software for any |
32 | * purpose with or without fee is hereby granted, provided that the above | |
33 | * copyright notice and this permission notice appear in all copies, and that | |
34 | * the name of Digital Equipment Corporation not be used in advertising or | |
35 | * publicity pertaining to distribution of the document or software without | |
36 | * specific, written prior permission. | |
fa0bc87c | 37 | * |
28f540f4 RM |
38 | * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL |
39 | * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES | |
40 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT | |
41 | * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL | |
42 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR | |
43 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS | |
44 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
45 | * SOFTWARE. | |
b43b13ac UD |
46 | */ |
47 | ||
48 | /* | |
49 | * Portions Copyright (c) 1996-1999 by Internet Software Consortium. | |
50 | * | |
51 | * Permission to use, copy, modify, and distribute this software for any | |
52 | * purpose with or without fee is hereby granted, provided that the above | |
53 | * copyright notice and this permission notice appear in all copies. | |
54 | * | |
55 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS | |
56 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES | |
57 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE | |
58 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL | |
59 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR | |
60 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS | |
61 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
62 | * SOFTWARE. | |
28f540f4 RM |
63 | */ |
64 | ||
65 | #if defined(LIBC_SCCS) && !defined(lint) | |
b43b13ac UD |
66 | static const char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93"; |
67 | static const char rcsid[] = "$Id$"; | |
28f540f4 RM |
68 | #endif /* LIBC_SCCS and not lint */ |
69 | ||
df21c858 | 70 | #include <sys/types.h> |
28f540f4 RM |
71 | #include <sys/param.h> |
72 | #include <netinet/in.h> | |
73 | #include <arpa/nameser.h> | |
74 | ||
28f540f4 | 75 | #include <ctype.h> |
66715f83 UD |
76 | #include <errno.h> |
77 | #include <resolv.h> | |
78 | #include <stdio.h> | |
28f540f4 | 79 | |
b43b13ac UD |
80 | #include <string.h> |
81 | #include <unistd.h> | |
28f540f4 | 82 | |
28f540f4 RM |
83 | |
84 | /* | |
85 | * Expand compressed domain name 'comp_dn' to full domain name. | |
86 | * 'msg' is a pointer to the begining of the message, | |
87 | * 'eomorig' points to the first location after the message, | |
88 | * 'exp_dn' is a pointer to a buffer of size 'length' for the result. | |
89 | * Return size of compressed name or -1 if there was an error. | |
90 | */ | |
91 | int | |
b43b13ac UD |
92 | dn_expand(const u_char *msg, const u_char *eom, const u_char *src, |
93 | char *dst, int dstsiz) | |
28f540f4 | 94 | { |
66715f83 | 95 | int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz); |
28f540f4 | 96 | |
66715f83 UD |
97 | if (n > 0 && dst[0] == '.') |
98 | dst[0] = '\0'; | |
99 | return (n); | |
28f540f4 RM |
100 | } |
101 | ||
102 | /* | |
66715f83 | 103 | * Pack domain name 'exp_dn' in presentation form into 'comp_dn'. |
28f540f4 RM |
104 | * Return the size of the compressed name or -1. |
105 | * 'length' is the size of the array pointed to by 'comp_dn'. | |
28f540f4 RM |
106 | */ |
107 | int | |
b43b13ac UD |
108 | dn_comp(const char *src, u_char *dst, int dstsiz, |
109 | u_char **dnptrs, u_char **lastdnptr) | |
28f540f4 | 110 | { |
66715f83 UD |
111 | return (ns_name_compress(src, dst, (size_t)dstsiz, |
112 | (const u_char **)dnptrs, | |
113 | (const u_char **)lastdnptr)); | |
28f540f4 RM |
114 | } |
115 | ||
116 | /* | |
117 | * Skip over a compressed domain name. Return the size or -1. | |
118 | */ | |
119 | int | |
b43b13ac | 120 | dn_skipname(const u_char *ptr, const u_char *eom) { |
66715f83 | 121 | const u_char *saveptr = ptr; |
28f540f4 | 122 | |
66715f83 UD |
123 | if (ns_name_skip(&ptr, eom) == -1) |
124 | return (-1); | |
125 | return (ptr - saveptr); | |
28f540f4 RM |
126 | } |
127 | ||
55707265 RM |
128 | /* |
129 | * Verify that a domain name uses an acceptable character set. | |
130 | */ | |
131 | ||
fa0bc87c RM |
132 | /* |
133 | * Note the conspicuous absence of ctype macros in these definitions. On | |
134 | * non-ASCII hosts, we can't depend on string literals or ctype macros to | |
135 | * tell us anything about network-format data. The rest of the BIND system | |
136 | * is not careful about this, but for some reason, we're doing it right here. | |
137 | */ | |
138 | #define PERIOD 0x2e | |
139 | #define hyphenchar(c) ((c) == 0x2d) | |
63bda0c1 | 140 | #define underscorechar(c) ((c) == 0x5f) |
fa0bc87c RM |
141 | #define bslashchar(c) ((c) == 0x5c) |
142 | #define periodchar(c) ((c) == PERIOD) | |
143 | #define asterchar(c) ((c) == 0x2a) | |
144 | #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \ | |
145 | || ((c) >= 0x61 && (c) <= 0x7a)) | |
146 | #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39) | |
147 | ||
148 | #define borderchar(c) (alphachar(c) || digitchar(c)) | |
63bda0c1 | 149 | #define middlechar(c) (borderchar(c) || hyphenchar(c) || underscorechar(c)) |
fa0bc87c | 150 | #define domainchar(c) ((c) > 0x20 && (c) < 0x7f) |
55707265 RM |
151 | |
152 | int | |
b43b13ac | 153 | res_hnok(const char *dn) { |
fa0bc87c | 154 | int ppch = '\0', pch = PERIOD, ch = *dn++; |
55707265 RM |
155 | |
156 | while (ch != '\0') { | |
157 | int nch = *dn++; | |
158 | ||
fa0bc87c | 159 | if (periodchar(ch)) { |
49b98627 | 160 | /* NULL */; |
fa0bc87c RM |
161 | } else if (periodchar(pch)) { |
162 | if (!borderchar(ch)) | |
163 | return (0); | |
164 | } else if (periodchar(nch) || nch == '\0') { | |
165 | if (!borderchar(ch)) | |
55707265 RM |
166 | return (0); |
167 | } else { | |
fa0bc87c | 168 | if (!middlechar(ch)) |
55707265 RM |
169 | return (0); |
170 | } | |
171 | ppch = pch, pch = ch, ch = nch; | |
55707265 RM |
172 | } |
173 | return (1); | |
174 | } | |
175 | ||
fa0bc87c RM |
176 | /* |
177 | * hostname-like (A, MX, WKS) owners can have "*" as their first label | |
178 | * but must otherwise be as a host name. | |
179 | */ | |
180 | int | |
b43b13ac | 181 | res_ownok(const char *dn) { |
1f64ac13 UD |
182 | if (asterchar(dn[0])) { |
183 | if (periodchar(dn[1])) | |
184 | return (res_hnok(dn+2)); | |
185 | if (dn[1] == '\0') | |
186 | return (1); | |
187 | } | |
fa0bc87c RM |
188 | return (res_hnok(dn)); |
189 | } | |
190 | ||
191 | /* | |
192 | * SOA RNAMEs and RP RNAMEs can have any printable character in their first | |
193 | * label, but the rest of the name has to look like a host name. | |
194 | */ | |
195 | int | |
b43b13ac | 196 | res_mailok(const char *dn) { |
df21c858 | 197 | int ch, escaped = 0; |
fa0bc87c | 198 | |
df21c858 UD |
199 | /* "." is a valid missing representation */ |
200 | if (*dn == '\0') | |
201 | return(1); | |
202 | ||
203 | /* otherwise <label>.<hostname> */ | |
fa0bc87c RM |
204 | while ((ch = *dn++) != '\0') { |
205 | if (!domainchar(ch)) | |
206 | return (0); | |
df21c858 | 207 | if (!escaped && periodchar(ch)) |
fa0bc87c | 208 | break; |
df21c858 UD |
209 | if (escaped) |
210 | escaped = 0; | |
211 | else if (bslashchar(ch)) | |
212 | escaped = 1; | |
fa0bc87c | 213 | } |
df21c858 UD |
214 | if (periodchar(ch)) |
215 | return (res_hnok(dn)); | |
b43b13ac | 216 | return (0); |
fa0bc87c RM |
217 | } |
218 | ||
55707265 RM |
219 | /* |
220 | * This function is quite liberal, since RFC 1034's character sets are only | |
221 | * recommendations. | |
55707265 RM |
222 | */ |
223 | int | |
b43b13ac | 224 | res_dnok(const char *dn) { |
55707265 RM |
225 | int ch; |
226 | ||
fa0bc87c RM |
227 | while ((ch = *dn++) != '\0') |
228 | if (!domainchar(ch)) | |
55707265 | 229 | return (0); |
55707265 RM |
230 | return (1); |
231 | } | |
232 | ||
b43b13ac | 233 | #ifdef BIND_4_COMPAT |
28f540f4 | 234 | /* |
b43b13ac UD |
235 | * This module must export the following externally-visible symbols: |
236 | * ___putlong | |
237 | * ___putshort | |
238 | * __getlong | |
239 | * __getshort | |
240 | * Note that one _ comes from C and the others come from us. | |
28f540f4 | 241 | */ |
b43b13ac UD |
242 | void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); } |
243 | void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); } | |
244 | #ifndef __ultrix__ | |
245 | u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); } | |
246 | u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); } | |
247 | #endif /*__ultrix__*/ | |
248 | #endif /*BIND_4_COMPAT*/ |