2 * Copyright (c) 1996 by Internet Software Consortium.
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
9 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
10 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
11 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
13 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
14 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
17 * $FreeBSD: src/lib/libc/net/ns_parse.c,v 1.3 1999/08/28 00:00:14 peter Exp $
18 * $DragonFly: src/lib/libc/net/ns_parse.c,v 1.2 2003/06/17 04:26:44 dillon Exp $
21 #include <sys/types.h>
23 #include <netinet/in.h>
24 #include <arpa/nameser.h>
30 /* These need to be in the same order as the nres.h:ns_flag enum. */
31 struct _ns_flagdata _ns_flagdata
[16] = {
32 { 0x8000, 15 }, /* qr. */
33 { 0x7800, 11 }, /* opcode. */
34 { 0x0400, 10 }, /* aa. */
35 { 0x0200, 9 }, /* tc. */
36 { 0x0100, 8 }, /* rd. */
37 { 0x0080, 7 }, /* ra. */
38 { 0x0040, 6 }, /* z. */
39 { 0x0020, 5 }, /* ad. */
40 { 0x0010, 4 }, /* cd. */
41 { 0x000f, 0 }, /* rcode. */
42 { 0x0000, 0 }, /* expansion (1/6). */
43 { 0x0000, 0 }, /* expansion (2/6). */
44 { 0x0000, 0 }, /* expansion (3/6). */
45 { 0x0000, 0 }, /* expansion (4/6). */
46 { 0x0000, 0 }, /* expansion (5/6). */
47 { 0x0000, 0 }, /* expansion (6/6). */
51 skiprr(const u_char
*ptr
, const u_char
*eom
, ns_sect section
, int count
) {
52 const u_char
*optr
= ptr
;
54 for ((void)NULL
; count
> 0; count
--) {
57 b
= dn_skipname(ptr
, eom
);
60 ptr
+= b
/*Name*/ + NS_INT16SZ
/*Type*/ + NS_INT16SZ
/*Class*/;
61 if (section
!= ns_s_qd
) {
62 if (ptr
+ NS_INT32SZ
> eom
)
64 ptr
+= NS_INT32SZ
/*TTL*/;
65 if (ptr
+ NS_INT16SZ
> eom
)
67 NS_GET16(rdlength
, ptr
);
68 ptr
+= rdlength
/*RData*/;
80 ns_initparse(const u_char
*msg
, int msglen
, ns_msg
*handle
) {
81 const u_char
*eom
= msg
+ msglen
;
84 memset(handle
, 0x5e, sizeof *handle
);
87 if (msg
+ NS_INT16SZ
> eom
)
89 NS_GET16(handle
->_id
, msg
);
90 if (msg
+ NS_INT16SZ
> eom
)
92 NS_GET16(handle
->_flags
, msg
);
93 for (i
= 0; i
< ns_s_max
; i
++) {
94 if (msg
+ NS_INT16SZ
> eom
)
96 NS_GET16(handle
->_counts
[i
], msg
);
98 for (i
= 0; i
< ns_s_max
; i
++)
99 if (handle
->_counts
[i
] == 0)
100 handle
->_sections
[i
] = NULL
;
102 int b
= skiprr(msg
, eom
, (ns_sect
)i
,
107 handle
->_sections
[i
] = msg
;
112 handle
->_sect
= ns_s_max
;
122 ns_parserr(ns_msg
*handle
, ns_sect section
, int rrnum
, ns_rr
*rr
) {
125 /* Make section right. */
126 if (section
< 0 || section
>= ns_s_max
)
128 if ((int)section
!= (int)handle
->_sect
) {
129 handle
->_sect
= section
;
131 handle
->_ptr
= handle
->_sections
[(int)section
];
134 /* Make rrnum right. */
136 rrnum
= handle
->_rrnum
;
137 if (rrnum
< 0 || rrnum
>= handle
->_counts
[(int)section
])
139 if (rrnum
< handle
->_rrnum
) {
141 handle
->_ptr
= handle
->_sections
[(int)section
];
144 b
= skiprr(handle
->_msg
, handle
->_eom
, section
,
145 rrnum
- handle
->_rrnum
);
149 handle
->_rrnum
= rrnum
;
152 b
= dn_expand(handle
->_msg
, handle
->_eom
,
153 handle
->_ptr
, rr
->name
, NS_MAXDNAME
);
157 if (handle
->_ptr
+ NS_INT16SZ
> handle
->_eom
)
159 NS_GET16(rr
->type
, handle
->_ptr
);
160 if (handle
->_ptr
+ NS_INT16SZ
> handle
->_eom
)
162 NS_GET16(rr
->rr_class
, handle
->_ptr
);
163 if (section
== ns_s_qd
) {
168 if (handle
->_ptr
+ NS_INT32SZ
> handle
->_eom
)
170 NS_GET32(rr
->ttl
, handle
->_ptr
);
171 if (handle
->_ptr
+ NS_INT16SZ
> handle
->_eom
)
173 NS_GET16(rr
->rdlength
, handle
->_ptr
);
174 if (handle
->_ptr
+ rr
->rdlength
> handle
->_eom
)
176 rr
->rdata
= handle
->_ptr
;
177 handle
->_ptr
+= rr
->rdlength
;