mshtml: Added IHTMLBodyElement::put_link implementation.
[wine] / dlls / dnsapi / ns_parse.c
1 /*
2  * Copyright (c) 1996,1999 by Internet Software Consortium.
3  *
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.
7  *
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
15  * SOFTWARE.
16  */
17
18 #include "config.h"
19
20 #ifdef HAVE_RESOLV
21
22 #include <sys/types.h>
23
24 #ifdef HAVE_NETINET_IN_H
25 # include <netinet/in.h>
26 #endif
27 #ifdef HAVE_ARPA_NAMESER_H
28 # include <arpa/nameser.h>
29 #endif
30
31 #include <errno.h>
32 #ifdef HAVE_RESOLV_H
33 # include <resolv.h>
34 #endif
35 #include <string.h>
36
37 #include "windef.h"
38
39 /* Forward. */
40
41 static void     setsection(ns_msg *msg, ns_sect sect);
42
43 /* Macros. */
44
45 #define RETERR(err) do { return (-1); } while (0)
46
47 #ifdef HAVE_NS_MSG__MSG_PTR
48 # define NS_PTR(ns_msg) ((ns_msg)->_msg_ptr)
49 #else
50 # define NS_PTR(ns_msg) ((ns_msg)->_ptr)
51 #endif
52
53 #define DNS_NS_GET16(s, cp) do { \
54     register const u_char *t_cp = (cp); \
55     (s) = ((WORD)t_cp[0] << 8) \
56         | ((WORD)t_cp[1]) \
57         ; \
58     (cp) += NS_INT16SZ; \
59 } while (0)
60
61 #define DNS_NS_GET32(l, cp) do { \
62     register const u_char *t_cp = (cp); \
63     (l) = ((DWORD)t_cp[0] << 24) \
64         | ((DWORD)t_cp[1] << 16) \
65         | ((DWORD)t_cp[2] << 8) \
66         | ((DWORD)t_cp[3]) \
67         ; \
68     (cp) += NS_INT32SZ; \
69 } while (0)
70
71 /* Public. */
72
73 static int
74 dns_ns_skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count) {
75         const u_char *optr = ptr;
76
77         for ((void)NULL; count > 0; count--) {
78                 int b, rdlength;
79
80                 b = dn_skipname(ptr, eom);
81                 if (b < 0)
82                         RETERR(EMSGSIZE);
83                 ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/;
84                 if (section != ns_s_qd) {
85                         if (ptr + NS_INT32SZ + NS_INT16SZ > eom)
86                                 RETERR(EMSGSIZE);
87                         ptr += NS_INT32SZ/*TTL*/;
88                         DNS_NS_GET16(rdlength, ptr);
89                         ptr += rdlength/*RData*/;
90                 }
91         }
92         if (ptr > eom)
93                 RETERR(EMSGSIZE);
94         return (ptr - optr);
95 }
96
97 int
98 dns_ns_initparse(const u_char *msg, int msglen, ns_msg *handle) {
99         const u_char *eom = msg + msglen;
100         int i;
101
102         memset(handle, 0x5e, sizeof *handle);
103         handle->_msg = msg;
104         handle->_eom = eom;
105         if (msg + NS_INT16SZ > eom)
106                 RETERR(EMSGSIZE);
107         DNS_NS_GET16(handle->_id, msg);
108         if (msg + NS_INT16SZ > eom)
109                 RETERR(EMSGSIZE);
110         DNS_NS_GET16(handle->_flags, msg);
111         for (i = 0; i < ns_s_max; i++) {
112                 if (msg + NS_INT16SZ > eom)
113                         RETERR(EMSGSIZE);
114                 DNS_NS_GET16(handle->_counts[i], msg);
115         }
116         for (i = 0; i < ns_s_max; i++)
117                 if (handle->_counts[i] == 0)
118                         handle->_sections[i] = NULL;
119                 else {
120                         int b = dns_ns_skiprr(msg, eom, (ns_sect)i,
121                                           handle->_counts[i]);
122
123                         if (b < 0)
124                                 return (-1);
125                         handle->_sections[i] = msg;
126                         msg += b;
127                 }
128         if (msg != eom)
129                 RETERR(EMSGSIZE);
130         setsection(handle, ns_s_max);
131         return (0);
132 }
133
134 int
135 dns_ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) {
136         int b;
137
138         /* Make section right. */
139         if (section < 0 || section >= ns_s_max)
140                 RETERR(ENODEV);
141         if (section != handle->_sect)
142                 setsection(handle, section);
143
144         /* Make rrnum right. */
145         if (rrnum == -1)
146                 rrnum = handle->_rrnum;
147         if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
148                 RETERR(ENODEV);
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);
154
155                 if (b < 0)
156                         return (-1);
157                 NS_PTR(handle) += b;
158                 handle->_rrnum = rrnum;
159         }
160
161         /* Do the parse. */
162         b = dn_expand(handle->_msg, handle->_eom,
163                       NS_PTR(handle), rr->name, NS_MAXDNAME);
164         if (b < 0)
165                 return (-1);
166         NS_PTR(handle) += b;
167         if (NS_PTR(handle) + NS_INT16SZ + NS_INT16SZ > handle->_eom)
168                 RETERR(EMSGSIZE);
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) {
172                 rr->ttl = 0;
173                 rr->rdlength = 0;
174                 rr->rdata = NULL;
175         } else {
176                 if (NS_PTR(handle) + NS_INT32SZ + NS_INT16SZ > handle->_eom)
177                         RETERR(EMSGSIZE);
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)
181                         RETERR(EMSGSIZE);
182                 rr->rdata = NS_PTR(handle);
183                 NS_PTR(handle) += rr->rdlength;
184         }
185         if (++handle->_rrnum > handle->_counts[(int)section])
186                 setsection(handle, (ns_sect)((int)section + 1));
187
188         /* All done. */
189         return (0);
190 }
191
192 /* Private. */
193
194 static void
195 setsection(ns_msg *msg, ns_sect sect) {
196         msg->_sect = sect;
197         if (sect == ns_s_max) {
198                 msg->_rrnum = -1;
199                 NS_PTR(msg) = NULL;
200         } else {
201                 msg->_rrnum = 0;
202                 NS_PTR(msg) = msg->_sections[(int)sect];
203         }
204 }
205
206 #endif