2 * @(#)res_comp.c 8.1 (Berkeley) 6/4/93
3 * $Id: res_comp.c,v 1.5 2005/07/28 06:51:50 marka Exp $
7 * Copyright (c) 1985, 1993
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56 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
57 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
59 * Permission to use, copy, modify, and distribute this software for any
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67 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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72 #include "port_before.h"
73 #include <sys/types.h>
74 #include <sys/param.h>
75 #include <netinet/in.h>
76 #include <arpa/nameser.h>
82 #include "port_after.h"
85 * Expand compressed domain name 'src' to full domain name.
87 * \li 'msg' is a pointer to the begining of the message,
88 * \li 'eom' points to the first location after the message,
89 * \li 'dst' is a pointer to a buffer of size 'dstsiz' for the result.
90 * \li Return size of compressed name or -1 if there was an error.
93 dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
94 char *dst, int dstsiz)
96 int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
98 if (n > 0 && dst[0] == '.')
104 * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
106 * \li Return the size of the compressed name or -1.
107 * \li 'length' is the size of the array pointed to by 'comp_dn'.
110 dn_comp(const char *src, u_char *dst, int dstsiz,
111 u_char **dnptrs, u_char **lastdnptr)
113 return (ns_name_compress(src, dst, (size_t)dstsiz,
114 (const u_char **)dnptrs,
115 (const u_char **)lastdnptr));
119 * Skip over a compressed domain name. Return the size or -1.
122 dn_skipname(const u_char *ptr, const u_char *eom) {
123 const u_char *saveptr = ptr;
125 if (ns_name_skip(&ptr, eom) == -1)
127 return (ptr - saveptr);
131 * Verify that a domain name uses an acceptable character set.
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.
139 #define hyphenchar(c) ((c) == 0x2d)
140 #define underscorechar(c) ((c) == 0x5f)
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)
148 #define borderchar(c) (alphachar(c) || digitchar(c))
149 #define middlechar(c) (borderchar(c) || hyphenchar(c) || underscorechar(c))
150 #define domainchar(c) ((c) > 0x20 && (c) < 0x7f)
153 res_hnok(const char *dn) {
154 int pch = PERIOD, ch = *dn++;
159 if (periodchar(ch)) {
161 } else if (periodchar(pch)) {
164 } else if (periodchar(nch) || nch == '\0') {
177 * hostname-like (A, MX, WKS) owners can have "*" as their first label
178 * but must otherwise be as a host name.
181 res_ownok(const char *dn) {
182 if (asterchar(dn[0])) {
183 if (periodchar(dn[1]))
184 return (res_hnok(dn+2));
188 return (res_hnok(dn));
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.
196 res_mailok(const char *dn) {
199 /* "." is a valid missing representation */
203 /* otherwise <label>.<hostname> */
204 while ((ch = *dn++) != '\0') {
207 if (!escaped && periodchar(ch))
211 else if (bslashchar(ch))
215 return (res_hnok(dn));
220 * This function is quite liberal, since RFC1034's character sets are only
224 res_dnok(const char *dn) {
227 while ((ch = *dn++) != '\0')
235 * This module must export the following externally-visible symbols:
240 * Note that one _ comes from C and the others come from us.
250 #pragma weak putlong = __putlong
251 #pragma weak putshort = __putshort
252 #endif /* SOLARIS2 */
254 void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }
255 void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
257 u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
258 u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
259 #endif /*__ultrix__*/
260 #endif /*BIND_4_COMPAT*/
264 * Weak aliases for applications that use certain private entry points,
265 * and fail to include <resolv.h>.
268 __weak_reference(__dn_comp, dn_comp);
270 __weak_reference(__dn_expand, dn_expand);