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10 <li><a href="main.html"><span>Main Page</span></a></li>
11 <li><a href="modules.html"><span>Modules</span></a></li>
12 <li><a href="classes.html"><span>Data Structures</span></a></li>
13 <li><a href="files.html"><span>Files</span></a></li>
14 <li><a href="examples.html"><span>Examples</span></a></li>
16 <h1>resolv.c</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class…
17 <a name="l00002"></a>00002 <span class="comment"> * \addtogroup apps</span>
18 <a name="l00003"></a>00003 <span class="comment"> * @{</span>
19 <a name="l00004"></a>00004 <span class="comment"> */</span>
20 <a name="l00005"></a>00005 <span class="comment"></span>
21 <a name="l00006"></a>00006 <span class="comment">/**</span>
22 <a name="l00007"></a>00007 <span class="comment"> * \defgroup resolv DNS resolver</span>
23 <a name="l00008"></a>00008 <span class="comment"> * @{</span>
24 <a name="l00009"></a>00009 <span class="comment"> *</span>
25 <a name="l00010"></a>00010 <span class="comment"> * The uIP DNS resolver functions are used to look…
26 <a name="l00011"></a>00011 <span class="comment"> * map it to a numerical IP address. It maintains …
27 <a name="l00012"></a>00012 <span class="comment"> * hostnames that can be queried with the resolv_l…
28 <a name="l00013"></a>00013 <span class="comment"> * function. New hostnames can be resolved using t…
29 <a name="l00014"></a>00014 <span class="comment"> * function.</span>
30 <a name="l00015"></a>00015 <span class="comment"> *</span>
31 <a name="l00016"></a>00016 <span class="comment"> * When a hostname has been resolved (or found to …
32 <a name="l00017"></a>00017 <span class="comment"> * the resolver code calls a callback function cal…
33 <a name="l00018"></a>00018 <span class="comment"> * that must be implemented by the module that use…
34 <a name="l00019"></a>00019 <span class="comment"> */</span>
35 <a name="l00020"></a>00020 <span class="comment"></span>
36 <a name="l00021"></a>00021 <span class="comment">/**</span>
37 <a name="l00022"></a>00022 <span class="comment"> * \file</span>
38 <a name="l00023"></a>00023 <span class="comment"> * DNS host name to IP address resolver.</span>
39 <a name="l00024"></a>00024 <span class="comment"> * \author Adam Dunkels <[email protected]></…
40 <a name="l00025"></a>00025 <span class="comment"> *</span>
41 <a name="l00026"></a>00026 <span class="comment"> * This file implements a DNS host name to IP addr…
42 <a name="l00027"></a>00027 <span class="comment"> */</span>
43 <a name="l00028"></a>00028
44 <a name="l00029"></a>00029 <span class="comment">/*</span>
45 <a name="l00030"></a>00030 <span class="comment"> * Copyright (c) 2002-2003, Adam Dunkels.</span>
46 <a name="l00031"></a>00031 <span class="comment"> * All rights reserved.</span>
47 <a name="l00032"></a>00032 <span class="comment"> *</span>
48 <a name="l00033"></a>00033 <span class="comment"> * Redistribution and use in source and binary for…
49 <a name="l00034"></a>00034 <span class="comment"> * modification, are permitted provided that the f…
50 <a name="l00035"></a>00035 <span class="comment"> * are met:</span>
51 <a name="l00036"></a>00036 <span class="comment"> * 1. Redistributions of source code must retain t…
52 <a name="l00037"></a>00037 <span class="comment"> * notice, this list of conditions and the foll…
53 <a name="l00038"></a>00038 <span class="comment"> * 2. Redistributions in binary form must reproduc…
54 <a name="l00039"></a>00039 <span class="comment"> * notice, this list of conditions and the foll…
55 <a name="l00040"></a>00040 <span class="comment"> * documentation and/or other materials provide…
56 <a name="l00041"></a>00041 <span class="comment"> * 3. The name of the author may not be used to en…
57 <a name="l00042"></a>00042 <span class="comment"> * products derived from this software without …
58 <a name="l00043"></a>00043 <span class="comment"> * written permission.</span>
59 <a name="l00044"></a>00044 <span class="comment"> *</span>
60 <a name="l00045"></a>00045 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS…
61 <a name="l00046"></a>00046 <span class="comment"> * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMIT…
62 <a name="l00047"></a>00047 <span class="comment"> * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A…
63 <a name="l00048"></a>00048 <span class="comment"> * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR B…
64 <a name="l00049"></a>00049 <span class="comment"> * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLAR…
65 <a name="l00050"></a>00050 <span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCURE…
66 <a name="l00051"></a>00051 <span class="comment"> * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFIT…
67 <a name="l00052"></a>00052 <span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY …
68 <a name="l00053"></a>00053 <span class="comment"> * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT …
69 <a name="l00054"></a>00054 <span class="comment"> * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT…
70 <a name="l00055"></a>00055 <span class="comment"> * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF…
71 <a name="l00056"></a>00056 <span class="comment"> *</span>
72 <a name="l00057"></a>00057 <span class="comment"> * This file is part of the uIP TCP/IP stack.</spa…
73 <a name="l00058"></a>00058 <span class="comment"> *</span>
74 <a name="l00059"></a>00059 <span class="comment"> * $Id: resolv.c,v 1.5 2006/06/11 21:46:37 adam Ex…
75 <a name="l00060"></a>00060 <span class="comment"> *</span>
76 <a name="l00061"></a>00061 <span class="comment"> */</span>
77 <a name="l00062"></a>00062
78 <a name="l00063"></a>00063 <span class="preprocessor">#include "<a class="code" href="a00103.html">…
79 <a name="l00064"></a>00064 <span class="preprocessor">#include "<a class="code" href="a00136.html">…
80 <a name="l00065"></a>00065
81 <a name="l00066"></a>00066 <span class="preprocessor">#include <string.h></span>
82 <a name="l00067"></a>00067
83 <a name="l00068"></a>00068 <span class="preprocessor">#ifndef NULL</span>
84 <a name="l00069"></a>00069 <span class="preprocessor"></span><span class="preprocessor">#define NUL…
85 <a name="l00070"></a>00070 <span class="preprocessor"></span><span class="preprocessor">#endif </sp…
86 <a name="l00071"></a>00071 <span class="comment"></span>
87 <a name="l00072"></a>00072 <span class="comment">/** \internal The maximum number of retries when a…
88 <a name="l00073"></a>00073 <span class="preprocessor">#define MAX_RETRIES 8</span>
89 <a name="l00074"></a>00074 <span class="preprocessor"></span><span class="comment"></span>
90 <a name="l00075"></a>00075 <span class="comment">/** \internal The DNS message header. */</span>
91 <a name="l00076"></a>00076 <span class="keyword">struct </span>dns_hdr {
92 <a name="l00077"></a>00077 <a name="a125"></a><a class="code" href="a00153.html#g77570ac4fcab8686…
93 <a name="l00078"></a>00078 <a name="a126"></a><a class="code" href="a00153.html#g4caecabca98b4391…
94 <a name="l00079"></a>00079 <span class="preprocessor">#define DNS_FLAG1_RESPONSE 0x80</span>
95 <a name="l00080"></a>00080 <span class="preprocessor"></span><span class="preprocessor">#define DNS…
96 <a name="l00081"></a>00081 <span class="preprocessor"></span><span class="preprocessor">#define DNS…
97 <a name="l00082"></a>00082 <span class="preprocessor"></span><span class="preprocessor">#define DNS…
98 <a name="l00083"></a>00083 <span class="preprocessor"></span><span class="preprocessor">#define DNS…
99 <a name="l00084"></a>00084 <span class="preprocessor"></span><span class="preprocessor">#define DNS…
100 <a name="l00085"></a>00085 <span class="preprocessor"></span><span class="preprocessor">#define DNS…
101 <a name="l00086"></a>00086 <span class="preprocessor"></span><span class="preprocessor">#define DNS…
102 <a name="l00087"></a>00087 <span class="preprocessor"></span><span class="preprocessor">#define DNS…
103 <a name="l00088"></a>00088 <span class="preprocessor"></span><span class="preprocessor">#define DNS…
104 <a name="l00089"></a>00089 <span class="preprocessor"></span><span class="preprocessor">#define DNS…
105 <a name="l00090"></a>00090 <span class="preprocessor"></span> <a class="code" href="a00153.html#g7…
106 <a name="l00091"></a>00091 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u…
107 <a name="l00092"></a>00092 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u…
108 <a name="l00093"></a>00093 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u…
109 <a name="l00094"></a>00094 };
110 <a name="l00095"></a>00095 <span class="comment"></span>
111 <a name="l00096"></a>00096 <span class="comment">/** \internal The DNS answer message structure. */…
112 <a name="l00097"></a>00097 <span class="keyword">struct </span>dns_answer {
113 <a name="l00098"></a>00098 <span class="comment">/* DNS answer record starts with either a domain…
114 <a name="l00099"></a>00099 <span class="comment"> to a name already present somewhere in the pa…
115 <a name="l00100"></a>00100 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u…
116 <a name="l00101"></a>00101 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u…
117 <a name="l00102"></a>00102 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u…
118 <a name="l00103"></a>00103 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u…
119 <a name="l00104"></a>00104 <a name="a127"></a><a class="code" href="a00150.html#g1ef35301f43a5bbb…
120 <a name="l00105"></a>00105 };
121 <a name="l00106"></a>00106
122 <a name="l00107"></a>00107 <span class="keyword">struct </span>namemap {
123 <a name="l00108"></a>00108 <span class="preprocessor">#define STATE_UNUSED 0</span>
124 <a name="l00109"></a>00109 <span class="preprocessor"></span><span class="preprocessor">#define STA…
125 <a name="l00110"></a>00110 <span class="preprocessor"></span><span class="preprocessor">#define STA…
126 <a name="l00111"></a>00111 <span class="preprocessor"></span><span class="preprocessor">#define STA…
127 <a name="l00112"></a>00112 <span class="preprocessor"></span><span class="preprocessor">#define STA…
128 <a name="l00113"></a>00113 <span class="preprocessor"></span> <a class="code" href="a00153.html#g4…
129 <a name="l00114"></a>00114 <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u…
130 <a name="l00115"></a>00115 <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u…
131 <a name="l00116"></a>00116 <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u…
132 <a name="l00117"></a>00117 <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u…
133 <a name="l00118"></a>00118 <span class="keywordtype">char</span> name[32];
134 <a name="l00119"></a>00119 <a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">u…
135 <a name="l00120"></a>00120 };
136 <a name="l00121"></a>00121
137 <a name="l00122"></a>00122 <span class="preprocessor">#ifndef UIP_CONF_RESOLV_ENTRIES</span>
138 <a name="l00123"></a>00123 <span class="preprocessor"></span><span class="preprocessor">#define RES…
139 <a name="l00124"></a>00124 <span class="preprocessor"></span><span class="preprocessor">#else </spa…
140 <a name="l00125"></a>00125 <span class="preprocessor">#define RESOLV_ENTRIES UIP_CONF_RESOLV_ENTRIE…
141 <a name="l00126"></a>00126 <span class="preprocessor"></span><span class="preprocessor">#endif </sp…
142 <a name="l00127"></a>00127
143 <a name="l00128"></a>00128
144 …a name="l00129"></a>00129 <span class="keyword">static</span> <span class="keyword">struct </span>…
145 <a name="l00130"></a>00130
146 <a name="l00131"></a>00131 <span class="keyword">static</span> <a class="code" href="a00153.html#g4…
147 <a name="l00132"></a>00132
148 …a name="l00133"></a>00133 <span class="keyword">static</span> <span class="keyword">struct </span>…
149 <a name="l00134"></a>00134
150 <a name="l00135"></a>00135
151 <a name="l00136"></a>00136 <span class="comment">/*------------------------------------------------…
152 <a name="l00137"></a>00137 <span class="comment">/** \internal</span>
153 <a name="l00138"></a>00138 <span class="comment"> * Walk through a compact encoded DNS name and ret…
154 <a name="l00139"></a>00139 <span class="comment"> *</span>
155 <a name="l00140"></a>00140 <span class="comment"> * \return The end of the name.</span>
156 <a name="l00141"></a>00141 <span class="comment"> */</span>
157 <a name="l00142"></a>00142 <span class="comment">/*------------------------------------------------…
158 <a name="l00143"></a>00143 <span class="keyword">static</span> <span class="keywordtype">unsigned</…
159 <a name="l00144"></a>00144 parse_name(<span class="keywordtype">unsigned</span> <span class="keywor…
160 <a name="l00145"></a>00145 {
161 <a name="l00146"></a>00146 <span class="keywordtype">unsigned</span> <span class="keywordtype">ch…
162 <a name="l00147"></a>00147
163 <a name="l00148"></a>00148 <span class="keywordflow">do</span> {
164 <a name="l00149"></a>00149 n = *query++;
165 <a name="l00150"></a>00150
166 <a name="l00151"></a>00151 <span class="keywordflow">while</span>(n > 0) {
167 <a name="l00152"></a>00152 <span class="comment">/* printf("%c", *query);*/</span>
168 <a name="l00153"></a>00153 ++query;
169 <a name="l00154"></a>00154 --n;
170 <a name="l00155"></a>00155 };
171 <a name="l00156"></a>00156 <span class="comment">/* printf(".");*/</span>
172 <a name="l00157"></a>00157 } <span class="keywordflow">while</span>(*query != 0);
173 <a name="l00158"></a>00158 <span class="comment">/* printf("\n");*/</span>
174 <a name="l00159"></a>00159 <span class="keywordflow">return</span> query + 1;
175 <a name="l00160"></a>00160 }
176 <a name="l00161"></a>00161 <span class="comment">/*------------------------------------------------…
177 <a name="l00162"></a>00162 <span class="comment">/** \internal</span>
178 <a name="l00163"></a>00163 <span class="comment"> * Runs through the list of names to see if there …
179 <a name="l00164"></a>00164 <span class="comment"> * not yet been queried and, if so, sends out a qu…
180 <a name="l00165"></a>00165 <span class="comment"> */</span>
181 <a name="l00166"></a>00166 <span class="comment">/*------------------------------------------------…
182 <a name="l00167"></a>00167 <span class="keyword">static</span> <span class="keywordtype">void</span>
183 <a name="l00168"></a>00168 check_entries(<span class="keywordtype">void</span>)
184 <a name="l00169"></a>00169 {
185 <a name="l00170"></a>00170 <span class="keyword">register</span> <span class="keyword">struct </s…
186 <a name="l00171"></a>00171 <span class="keywordtype">char</span> *query, *nptr, *nameptr;
187 <a name="l00172"></a>00172 <span class="keyword">static</span> <a class="code" href="a00153.html#…
188 <a name="l00173"></a>00173 <span class="keyword">static</span> <a class="code" href="a00153.html#…
189 <a name="l00174"></a>00174 <span class="keyword">register</span> <span class="keyword">struct </s…
190 <a name="l00175"></a>00175
191 …a name="l00176"></a>00176 <span class="keywordflow">for</span>(i = 0; i < <a class="code" hre…
192 <a name="l00177"></a>00177 namemapptr = &names[i];
193 …a name="l00178"></a>00178 <span class="keywordflow">if</span>(namemapptr->state == <a name=…
194 …a name="l00179"></a>00179 namemapptr->state == <a name="a132"></a><a class="code" href="…
195 …a name="l00180"></a>00180 <span class="keywordflow">if</span>(namemapptr->state == <a cla…
196 <a name="l00181"></a>00181 <span class="keywordflow">if</span>(--namemapptr->tmr == 0) {
197 …a name="l00182"></a>00182 <span class="keywordflow">if</span>(++namemapptr->retries =…
198 …a name="l00183"></a>00183 namemapptr->state = <a name="a134"></a><a class="code" hr…
199 …a name="l00184"></a>00184 <a name="a135"></a><a class="code" href="a00160.html#g6d9751…
200 <a name="l00185"></a>00185 <span class="keywordflow">continue</span>;
201 <a name="l00186"></a>00186 }
202 <a name="l00187"></a>00187 namemapptr->tmr = namemapptr->retries;
203 <a name="l00188"></a>00188 } <span class="keywordflow">else</span> {
204 <a name="l00189"></a>00189 <span class="comment">/* printf("Timer %d\n", namemapptr-…
205 <a name="l00190"></a>00190 <span class="comment">/* Its timer has not run out, so we move…
206 <a name="l00191"></a>00191 <span class="comment"> entry. */</span>
207 <a name="l00192"></a>00192 <span class="keywordflow">continue</span>;
208 <a name="l00193"></a>00193 }
209 <a name="l00194"></a>00194 } <span class="keywordflow">else</span> {
210 <a name="l00195"></a>00195 namemapptr->state = <a class="code" href="a00102.html#5573565…
211 <a name="l00196"></a>00196 namemapptr->tmr = 1;
212 <a name="l00197"></a>00197 namemapptr->retries = 0;
213 <a name="l00198"></a>00198 }
214 …a name="l00199"></a>00199 hdr = (<span class="keyword">struct </span>dns_hdr *)<a name="a136…
215 <a name="l00200"></a>00200 memset(hdr, 0, <span class="keyword">sizeof</span>(<span class="ke…
216 <a name="l00201"></a>00201 hdr->id = <a name="a137"></a><a class="code" href="a00148.html#…
217 <a name="l00202"></a>00202 hdr->flags1 = <a name="a138"></a><a class="code" href="a00102.h…
218 <a name="l00203"></a>00203 hdr->numquestions = <a name="a139"></a><a class="code" href="a0…
219 …a name="l00204"></a>00204 query = (<span class="keywordtype">char</span> *)<a class="code" h…
220 <a name="l00205"></a>00205 nameptr = namemapptr->name;
221 <a name="l00206"></a>00206 --nameptr;
222 <a name="l00207"></a>00207 <span class="comment">/* Convert hostname into suitable query form…
223 <a name="l00208"></a>00208 <span class="keywordflow">do</span> {
224 <a name="l00209"></a>00209 ++nameptr;
225 <a name="l00210"></a>00210 nptr = query;
226 <a name="l00211"></a>00211 ++query;
227 <a name="l00212"></a>00212 <span class="keywordflow">for</span>(n = 0; *nameptr != <span cl…
228 <a name="l00213"></a>00213 *query = *nameptr;
229 <a name="l00214"></a>00214 ++query;
230 <a name="l00215"></a>00215 ++n;
231 <a name="l00216"></a>00216 }
232 <a name="l00217"></a>00217 *nptr = n;
233 <a name="l00218"></a>00218 } <span class="keywordflow">while</span>(*nameptr != 0);
234 <a name="l00219"></a>00219 {
235 <a name="l00220"></a>00220 <span class="keyword">static</span> <span class="keywordtype">un…
236 <a name="l00221"></a>00221 {0,0,1,0,1};
237 <a name="l00222"></a>00222 memcpy(query, endquery, 5);
238 <a name="l00223"></a>00223 }
239 …a name="l00224"></a>00224 <a name="a140"></a><a class="code" href="a00147.html#ge5ab69d40013…
240 <a name="l00225"></a>00225 <span class="keywordflow">break</span>;
241 <a name="l00226"></a>00226 }
242 <a name="l00227"></a>00227 }
243 <a name="l00228"></a>00228 }
244 <a name="l00229"></a>00229 <span class="comment">/*------------------------------------------------…
245 <a name="l00230"></a>00230 <span class="comment">/** \internal</span>
246 <a name="l00231"></a>00231 <span class="comment"> * Called when new UDP data arrives.</span>
247 <a name="l00232"></a>00232 <span class="comment"> */</span>
248 <a name="l00233"></a>00233 <span class="comment">/*------------------------------------------------…
249 <a name="l00234"></a>00234 <span class="keyword">static</span> <span class="keywordtype">void</span>
250 <a name="l00235"></a>00235 newdata(<span class="keywordtype">void</span>)
251 <a name="l00236"></a>00236 {
252 <a name="l00237"></a>00237 <span class="keywordtype">char</span> *nameptr;
253 <a name="l00238"></a>00238 <span class="keyword">struct </span>dns_answer *ans;
254 <a name="l00239"></a>00239 <span class="keyword">struct </span>dns_hdr *hdr;
255 <a name="l00240"></a>00240 <span class="keyword">static</span> <a class="code" href="a00153.html#…
256 <a name="l00241"></a>00241 <span class="keyword">static</span> <a class="code" href="a00153.html#…
257 <a name="l00242"></a>00242 <span class="keyword">register</span> <span class="keyword">struct </s…
258 <a name="l00243"></a>00243
259 …a name="l00244"></a>00244 hdr = (<span class="keyword">struct </span>dns_hdr *)<a class="code" h…
260 <a name="l00245"></a>00245 <span class="comment">/* printf("ID %d\n", htons(hdr->id));</span>
261 <a name="l00246"></a>00246 <span class="comment"> printf("Query %d\n", hdr->flags1 & DN…
262 <a name="l00247"></a>00247 <span class="comment"> printf("Error %d\n", hdr->flags2 & DN…
263 <a name="l00248"></a>00248 <span class="comment"> printf("Num questions %d, answers %d, authrr…
264 <a name="l00249"></a>00249 <span class="comment"> htons(hdr->numquestions),</span>
265 <a name="l00250"></a>00250 <span class="comment"> htons(hdr->numanswers),</span>
266 <a name="l00251"></a>00251 <span class="comment"> htons(hdr->numauthrr),</span>
267 <a name="l00252"></a>00252 <span class="comment"> htons(hdr->numextrarr));</span>
268 <a name="l00253"></a>00253 <span class="comment"> */</span>
269 <a name="l00254"></a>00254
270 <a name="l00255"></a>00255 <span class="comment">/* The ID in the DNS header should be our entry …
271 <a name="l00256"></a>00256 <span class="comment"> table. */</span>
272 <a name="l00257"></a>00257 i = <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc0…
273 <a name="l00258"></a>00258 namemapptr = &names[i];
274 …a name="l00259"></a>00259 <span class="keywordflow">if</span>(i < <a class="code" href="a0016…
275 <a name="l00260"></a>00260 namemapptr->state == <a class="code" href="a00102.html#55735650f…
276 <a name="l00261"></a>00261
277 <a name="l00262"></a>00262 <span class="comment">/* This entry is now finished. */</span>
278 …a name="l00263"></a>00263 namemapptr->state = <a name="a141"></a><a class="code" href="a001…
279 …a name="l00264"></a>00264 namemapptr->err = hdr->flags2 & <a name="a142"></a><a clas…
280 <a name="l00265"></a>00265
281 <a name="l00266"></a>00266 <span class="comment">/* Check for error. If so, call callback to in…
282 <a name="l00267"></a>00267 <span class="keywordflow">if</span>(namemapptr->err != 0) {
283 <a name="l00268"></a>00268 namemapptr->state = <a class="code" href="a00102.html#7bf0c086c…
284 …a name="l00269"></a>00269 <a class="code" href="a00160.html#g6d9751d534453425c7a5a215d1d4414…
285 <a name="l00270"></a>00270 <span class="keywordflow">return</span>;
286 <a name="l00271"></a>00271 }
287 <a name="l00272"></a>00272
288 <a name="l00273"></a>00273 <span class="comment">/* We only care about the question(s) and the …
289 <a name="l00274"></a>00274 <span class="comment"> and the extrarr are simply discarded. */</s…
290 <a name="l00275"></a>00275 nquestions = <a class="code" href="a00148.html#ga22b04cac8cf283ca12f…
291 <a name="l00276"></a>00276 nanswers = <a class="code" href="a00148.html#ga22b04cac8cf283ca12f02…
292 <a name="l00277"></a>00277
293 <a name="l00278"></a>00278 <span class="comment">/* Skip the name in the question. XXX: This sh…
294 <a name="l00279"></a>00279 <span class="comment"> checked agains the name in the question, to…
295 <a name="l00280"></a>00280 <span class="comment"> match. */</span>
296 …a name="l00281"></a>00281 nameptr = parse_name((<span class="keywordtype">char</span> *)<a cla…
297 <a name="l00282"></a>00282
298 <a name="l00283"></a>00283 <span class="keywordflow">while</span>(nanswers > 0) {
299 <a name="l00284"></a>00284 <span class="comment">/* The first byte in the answer resource rec…
300 <a name="l00285"></a>00285 <span class="comment"> is a compressed record or a normal one. *…
301 <a name="l00286"></a>00286 <span class="keywordflow">if</span>(*nameptr & 0xc0) {
302 <a name="l00287"></a>00287 <span class="comment">/* Compressed name. */</span>
303 <a name="l00288"></a>00288 nameptr +=2;
304 <a name="l00289"></a>00289 <span class="comment">/* printf("Compressed anwser\n");*/</…
305 <a name="l00290"></a>00290 } <span class="keywordflow">else</span> {
306 <a name="l00291"></a>00291 <span class="comment">/* Not compressed name. */</span>
307 <a name="l00292"></a>00292 nameptr = parse_name((<span class="keywordtype">char</span> *)na…
308 <a name="l00293"></a>00293 }
309 <a name="l00294"></a>00294
310 <a name="l00295"></a>00295 ans = (<span class="keyword">struct </span>dns_answer *)nameptr;
311 <a name="l00296"></a>00296 <span class="comment">/* printf("Answer: type %x, class %x, t…
312 <a name="l00297"></a>00297 <span class="comment"> htons(ans->type), htons(ans->cl…
313 <a name="l00298"></a>00298 <span class="comment"> << 16) | htons(ans->ttl[1]),…
314 <a name="l00299"></a>00299
315 <a name="l00300"></a>00300 <span class="comment">/* Check for IP address type and Internet cl…
316 <a name="l00301"></a>00301 <span class="comment"> discarded. */</span>
317 …a name="l00302"></a>00302 <span class="keywordflow">if</span>(ans->type == <a class="code…
318 <a name="l00303"></a>00303 ans->class == <a class="code" href="a00148.html#g69a7a4951ff…
319 <a name="l00304"></a>00304 ans->len == <a class="code" href="a00148.html#g69a7a4951ff21…
320 <a name="l00305"></a>00305 <span class="comment">/* printf("IP address %d.%d.%d.%d\n",…
321 <a name="l00306"></a>00306 <span class="comment"> htons(ans->ipaddr[0]) >> 8…
322 <a name="l00307"></a>00307 <span class="comment"> htons(ans->ipaddr[0]) & 0xff…
323 <a name="l00308"></a>00308 <span class="comment"> htons(ans->ipaddr[1]) >> 8…
324 <a name="l00309"></a>00309 <span class="comment"> htons(ans->ipaddr[1]) & 0xff…
325 <a name="l00310"></a>00310 <span class="comment">/* XXX: we should really check that this I…
326 <a name="l00311"></a>00311 <span class="comment"> we want. */</span>
327 <a name="l00312"></a>00312 namemapptr->ipaddr[0] = ans->ipaddr[0];
328 <a name="l00313"></a>00313 namemapptr->ipaddr[1] = ans->ipaddr[1];
329 <a name="l00314"></a>00314
330 <a name="l00315"></a>00315 <a class="code" href="a00160.html#g6d9751d534453425c7a5a215d1d44…
331 <a name="l00316"></a>00316 <span class="keywordflow">return</span>;
332 <a name="l00317"></a>00317 } <span class="keywordflow">else</span> {
333 <a name="l00318"></a>00318 nameptr = nameptr + 10 + <a class="code" href="a00148.html#ga22b…
334 <a name="l00319"></a>00319 }
335 <a name="l00320"></a>00320 --nanswers;
336 <a name="l00321"></a>00321 }
337 <a name="l00322"></a>00322 }
338 <a name="l00323"></a>00323
339 <a name="l00324"></a>00324 }
340 <a name="l00325"></a>00325 <span class="comment">/*------------------------------------------------…
341 <a name="l00326"></a>00326 <span class="comment">/** \internal</span>
342 <a name="l00327"></a>00327 <span class="comment"> * The main UDP function.</span>
343 <a name="l00328"></a>00328 <span class="comment"> */</span>
344 <a name="l00329"></a>00329 <span class="comment">/*------------------------------------------------…
345 <a name="l00330"></a>00330 <span class="keywordtype">void</span>
346 <a name="l00331"></a>00331 <a name="a143"></a><a class="code" href="a00160.html#g7c5359305008e9183b…
347 <a name="l00332"></a>00332 {
348 …a name="l00333"></a>00333 <span class="keywordflow">if</span>(<a class="code" href="a00095.html"…
349 …a name="l00334"></a>00334 <span class="keywordflow">if</span>(<a name="a144"></a><a class="cod…
350 <a name="l00335"></a>00335 check_entries();
351 <a name="l00336"></a>00336 }
352 …a name="l00337"></a>00337 <span class="keywordflow">if</span>(<a name="a145"></a><a class="cod…
353 <a name="l00338"></a>00338 newdata();
354 <a name="l00339"></a>00339 }
355 <a name="l00340"></a>00340 }
356 <a name="l00341"></a>00341 }
357 <a name="l00342"></a>00342 <span class="comment">/*------------------------------------------------…
358 <a name="l00343"></a>00343 <span class="comment">/**</span>
359 <a name="l00344"></a>00344 <span class="comment"> * Queues a name so that a question for the name w…
360 <a name="l00345"></a>00345 <span class="comment"> *</span>
361 <a name="l00346"></a>00346 <span class="comment"> * \param name The hostname that is to be queried.…
362 <a name="l00347"></a>00347 <span class="comment"> */</span>
363 <a name="l00348"></a>00348 <span class="comment">/*------------------------------------------------…
364 <a name="l00349"></a>00349 <span class="keywordtype">void</span>
365 <a name="l00350"></a>00350 <a name="a146"></a><a class="code" href="a00160.html#ge4dcbbe6c641d2e3b8…
366 <a name="l00351"></a>00351 {
367 <a name="l00352"></a>00352 <span class="keyword">static</span> <a class="code" href="a00153.html#…
368 <a name="l00353"></a>00353 <span class="keyword">static</span> <a class="code" href="a00153.html#…
369 <a name="l00354"></a>00354 <span class="keyword">register</span> <span class="keyword">struct </s…
370 <a name="l00355"></a>00355
371 <a name="l00356"></a>00356 lseq = lseqi = 0;
372 <a name="l00357"></a>00357
373 …a name="l00358"></a>00358 <span class="keywordflow">for</span>(i = 0; i < <a class="code" hre…
374 <a name="l00359"></a>00359 nameptr = &names[i];
375 …a name="l00360"></a>00360 <span class="keywordflow">if</span>(nameptr->state == <a name="a1…
376 <a name="l00361"></a>00361 <span class="keywordflow">break</span>;
377 <a name="l00362"></a>00362 }
378 <a name="l00363"></a>00363 <span class="keywordflow">if</span>(seqno - nameptr->seqno > l…
379 <a name="l00364"></a>00364 lseq = seqno - nameptr->seqno;
380 <a name="l00365"></a>00365 lseqi = i;
381 <a name="l00366"></a>00366 }
382 <a name="l00367"></a>00367 }
383 <a name="l00368"></a>00368
384 …a name="l00369"></a>00369 <span class="keywordflow">if</span>(i == <a class="code" href="a00160.…
385 <a name="l00370"></a>00370 i = lseqi;
386 <a name="l00371"></a>00371 nameptr = &names[i];
387 <a name="l00372"></a>00372 }
388 <a name="l00373"></a>00373
389 <a name="l00374"></a>00374 <span class="comment">/* printf("Using entry %d\n", i);*/</span>
390 <a name="l00375"></a>00375
391 <a name="l00376"></a>00376 strcpy(nameptr->name, name);
392 <a name="l00377"></a>00377 nameptr->state = <a class="code" href="a00102.html#bf4401501f138987…
393 <a name="l00378"></a>00378 nameptr->seqno = seqno;
394 <a name="l00379"></a>00379 ++seqno;
395 <a name="l00380"></a>00380 }
396 <a name="l00381"></a>00381 <span class="comment">/*------------------------------------------------…
397 <a name="l00382"></a>00382 <span class="comment">/**</span>
398 <a name="l00383"></a>00383 <span class="comment"> * Look up a hostname in the array of known hostna…
399 <a name="l00384"></a>00384 <span class="comment"> *</span>
400 <a name="l00385"></a>00385 <span class="comment"> * \note This function only looks in the internal …
401 <a name="l00386"></a>00386 <span class="comment"> * hostnames, it does not send out a query for the…
402 <a name="l00387"></a>00387 <span class="comment"> * was found. The function resolv_query() can be u…
403 <a name="l00388"></a>00388 <span class="comment"> * for a hostname.</span>
404 <a name="l00389"></a>00389 <span class="comment"> *</span>
405 <a name="l00390"></a>00390 <span class="comment"> * \return A pointer to a 4-byte representation of…
406 <a name="l00391"></a>00391 <span class="comment"> * address, or NULL if the hostname was not found …
407 <a name="l00392"></a>00392 <span class="comment"> * hostnames.</span>
408 <a name="l00393"></a>00393 <span class="comment"> */</span>
409 <a name="l00394"></a>00394 <span class="comment">/*------------------------------------------------…
410 <a name="l00395"></a>00395 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16…
411 <a name="l00396"></a>00396 <a name="a148"></a><a class="code" href="a00160.html#g66d19181ad5fe8b8f7…
412 <a name="l00397"></a>00397 {
413 <a name="l00398"></a>00398 <span class="keyword">static</span> <a class="code" href="a00153.html#…
414 <a name="l00399"></a>00399 <span class="keyword">struct </span>namemap *nameptr;
415 <a name="l00400"></a>00400
416 <a name="l00401"></a>00401 <span class="comment">/* Walk through the list to see if the name is i…
417 <a name="l00402"></a>00402 <span class="comment"> not, we return NULL. */</span>
418 …a name="l00403"></a>00403 <span class="keywordflow">for</span>(i = 0; i < <a class="code" hre…
419 <a name="l00404"></a>00404 nameptr = &names[i];
420 …a name="l00405"></a>00405 <span class="keywordflow">if</span>(nameptr->state == <a class="c…
421 <a name="l00406"></a>00406 strcmp(name, nameptr->name) == 0) {
422 <a name="l00407"></a>00407 <span class="keywordflow">return</span> nameptr->ipaddr;
423 <a name="l00408"></a>00408 }
424 <a name="l00409"></a>00409 }
425 <a name="l00410"></a>00410 <span class="keywordflow">return</span> <a class="code" href="a00160.h…
426 <a name="l00411"></a>00411 }
427 <a name="l00412"></a>00412 <span class="comment">/*------------------------------------------------…
428 <a name="l00413"></a>00413 <span class="comment">/**</span>
429 <a name="l00414"></a>00414 <span class="comment"> * Obtain the currently configured DNS server.</sp…
430 <a name="l00415"></a>00415 <span class="comment"> *</span>
431 <a name="l00416"></a>00416 <span class="comment"> * \return A pointer to a 4-byte representation of…
432 <a name="l00417"></a>00417 <span class="comment"> * the currently configured DNS server or NULL if …
433 <a name="l00418"></a>00418 <span class="comment"> * been configured.</span>
434 <a name="l00419"></a>00419 <span class="comment"> */</span>
435 <a name="l00420"></a>00420 <span class="comment">/*------------------------------------------------…
436 <a name="l00421"></a>00421 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16…
437 <a name="l00422"></a>00422 <a name="a149"></a><a class="code" href="a00160.html#g3191066cf8f76bd00b…
438 <a name="l00423"></a>00423 {
439 …a name="l00424"></a>00424 <span class="keywordflow">if</span>(resolv_conn == <a class="code" hre…
440 <a name="l00425"></a>00425 <span class="keywordflow">return</span> <a class="code" href="a00160…
441 <a name="l00426"></a>00426 }
442 …a name="l00427"></a>00427 <span class="keywordflow">return</span> resolv_conn-><a name="a150"…
443 <a name="l00428"></a>00428 }
444 <a name="l00429"></a>00429 <span class="comment">/*------------------------------------------------…
445 <a name="l00430"></a>00430 <span class="comment">/**</span>
446 <a name="l00431"></a>00431 <span class="comment"> * Configure which DNS server to use for queries.<…
447 <a name="l00432"></a>00432 <span class="comment"> *</span>
448 <a name="l00433"></a>00433 <span class="comment"> * \param dnsserver A pointer to a 4-byte represen…
449 <a name="l00434"></a>00434 <span class="comment"> * address of the DNS server to be configured.</sp…
450 <a name="l00435"></a>00435 <span class="comment"> */</span>
451 <a name="l00436"></a>00436 <span class="comment">/*------------------------------------------------…
452 <a name="l00437"></a>00437 <span class="keywordtype">void</span>
453 …a name="l00438"></a>00438 <a name="a151"></a><a class="code" href="a00160.html#gdf916e0c752f5cda70…
454 <a name="l00439"></a>00439 {
455 …a name="l00440"></a>00440 <span class="keywordflow">if</span>(resolv_conn != <a class="code" hre…
456 <a name="l00441"></a>00441 <a name="a152"></a><a class="code" href="a00147.html#gf2dbaceb10c677…
457 <a name="l00442"></a>00442 }
458 <a name="l00443"></a>00443
459 …a name="l00444"></a>00444 resolv_conn = <a name="a153"></a><a class="code" href="a00147.html#g79…
460 <a name="l00445"></a>00445 }
461 <a name="l00446"></a>00446 <span class="comment">/*------------------------------------------------…
462 <a name="l00447"></a>00447 <span class="comment">/**</span>
463 <a name="l00448"></a>00448 <span class="comment"> * Initalize the resolver.</span>
464 <a name="l00449"></a>00449 <span class="comment"> */</span>
465 <a name="l00450"></a>00450 <span class="comment">/*------------------------------------------------…
466 <a name="l00451"></a>00451 <span class="keywordtype">void</span>
467 <a name="l00452"></a>00452 <a name="a154"></a><a class="code" href="a00160.html#gb50f78bbf36d912d69…
468 <a name="l00453"></a>00453 {
469 <a name="l00454"></a>00454 <span class="keyword">static</span> <a class="code" href="a00153.html#…
470 <a name="l00455"></a>00455
471 …a name="l00456"></a>00456 <span class="keywordflow">for</span>(i = 0; i < <a class="code" hre…
472 <a name="l00457"></a>00457 names[i].state = <a class="code" href="a00102.html#876c82c946543cd70…
473 <a name="l00458"></a>00458 }
474 <a name="l00459"></a>00459
475 <a name="l00460"></a>00460 }
476 <a name="l00461"></a>00461 <span class="comment">/*------------------------------------------------…
477 <a name="l00462"></a>00462 <span class="comment"></span>
478 <a name="l00463"></a>00463 <span class="comment">/** @} */</span><span class="comment"></span>
479 <a name="l00464"></a>00464 <span class="comment">/** @} */</span>
481 <a href="http://www.doxygen.org/index.html">
482 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address>