2 * Copyright (c) 1996,1999 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
22 #include <sys/types.h>
24 #ifdef HAVE_NETINET_IN_H
25 # include <netinet/in.h>
27 #ifdef HAVE_ARPA_NAMESER_H
28 # include <arpa/nameser.h>
41 static void setsection(ns_msg
*msg
, ns_sect sect
);
45 #define RETERR(err) do { return (-1); } while (0)
47 #ifdef HAVE_NS_MSG__MSG_PTR
48 # define NS_PTR(ns_msg) ((ns_msg)->_msg_ptr)
50 # define NS_PTR(ns_msg) ((ns_msg)->_ptr)
53 #define DNS_NS_GET16(s, cp) do { \
54 register const u_char *t_cp = (const u_char *)(cp); \
55 (s) = ((WORD)t_cp[0] << 8) \
61 #define DNS_NS_GET32(l, cp) do { \
62 register const u_char *t_cp = (const u_char *)(cp); \
63 (l) = ((DWORD)t_cp[0] << 24) \
64 | ((DWORD)t_cp[1] << 16) \
65 | ((DWORD)t_cp[2] << 8) \
74 dns_ns_skiprr(const u_char
*ptr
, const u_char
*eom
, ns_sect section
, int count
) {
75 const u_char
*optr
= ptr
;
77 for ((void)NULL
; count
> 0; count
--) {
80 b
= dn_skipname(ptr
, eom
);
83 ptr
+= b
/*Name*/ + NS_INT16SZ
/*Type*/ + NS_INT16SZ
/*Class*/;
84 if (section
!= ns_s_qd
) {
85 if (ptr
+ NS_INT32SZ
+ NS_INT16SZ
> eom
)
87 ptr
+= NS_INT32SZ
/*TTL*/;
88 DNS_NS_GET16(rdlength
, ptr
);
89 ptr
+= rdlength
/*RData*/;
98 dns_ns_initparse(const u_char
*msg
, int msglen
, ns_msg
*handle
) {
99 const u_char
*eom
= msg
+ msglen
;
102 memset(handle
, 0x5e, sizeof *handle
);
105 if (msg
+ NS_INT16SZ
> eom
)
107 DNS_NS_GET16(handle
->_id
, msg
);
108 if (msg
+ NS_INT16SZ
> eom
)
110 DNS_NS_GET16(handle
->_flags
, msg
);
111 for (i
= 0; i
< ns_s_max
; i
++) {
112 if (msg
+ NS_INT16SZ
> eom
)
114 DNS_NS_GET16(handle
->_counts
[i
], msg
);
116 for (i
= 0; i
< ns_s_max
; i
++)
117 if (handle
->_counts
[i
] == 0)
118 handle
->_sections
[i
] = NULL
;
120 int b
= dns_ns_skiprr(msg
, eom
, (ns_sect
)i
,
125 handle
->_sections
[i
] = msg
;
130 setsection(handle
, ns_s_max
);
135 dns_ns_parserr(ns_msg
*handle
, ns_sect section
, int rrnum
, ns_rr
*rr
) {
138 /* Make section right. */
139 if (section
< 0 || section
>= ns_s_max
)
141 if (section
!= handle
->_sect
)
142 setsection(handle
, section
);
144 /* Make rrnum right. */
146 rrnum
= handle
->_rrnum
;
147 if (rrnum
< 0 || rrnum
>= handle
->_counts
[(int)section
])
149 if (rrnum
< handle
->_rrnum
)
150 setsection(handle
, section
);
151 if (rrnum
> handle
->_rrnum
) {
152 b
= dns_ns_skiprr(NS_PTR(handle
), handle
->_eom
, section
,
153 rrnum
- handle
->_rrnum
);
158 handle
->_rrnum
= rrnum
;
162 b
= dn_expand(handle
->_msg
, handle
->_eom
,
163 NS_PTR(handle
), rr
->name
, NS_MAXDNAME
);
167 if (NS_PTR(handle
) + NS_INT16SZ
+ NS_INT16SZ
> handle
->_eom
)
169 DNS_NS_GET16(rr
->type
, NS_PTR(handle
));
170 DNS_NS_GET16(rr
->rr_class
, NS_PTR(handle
));
171 if (section
== ns_s_qd
) {
176 if (NS_PTR(handle
) + NS_INT32SZ
+ NS_INT16SZ
> handle
->_eom
)
178 DNS_NS_GET32(rr
->ttl
, NS_PTR(handle
));
179 DNS_NS_GET16(rr
->rdlength
, NS_PTR(handle
));
180 if (NS_PTR(handle
) + rr
->rdlength
> handle
->_eom
)
182 rr
->rdata
= NS_PTR(handle
);
183 NS_PTR(handle
) += rr
->rdlength
;
185 if (++handle
->_rrnum
> handle
->_counts
[(int)section
])
186 setsection(handle
, (ns_sect
)((int)section
+ 1));
195 setsection(ns_msg
*msg
, ns_sect sect
) {
197 if (sect
== ns_s_max
) {
202 NS_PTR(msg
) = msg
->_sections
[(int)sect
];