a00172.html

uip-1.0,give everyone who want.

<a name="l00227"></a>00227   }
<a name="l00228"></a>00228 }
<a name="l00229"></a>00229 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
<a name="l00230"></a>00230 <span class="comment">/** \internal</span>
<a name="l00231"></a>00231 <span class="comment"> * Called when new UDP data arrives.</span>
<a name="l00232"></a>00232 <span class="comment"> */</span>
<a name="l00233"></a>00233 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00234"></a>00234 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00235"></a>00235 newdata(<span class="keywordtype">void</span>)
<a name="l00236"></a>00236 {
<a name="l00237"></a>00237   <span class="keywordtype">char</span> *nameptr;
<a name="l00238"></a>00238   <span class="keyword">struct </span>dns_answer *ans;
<a name="l00239"></a>00239   <span class="keyword">struct </span>dns_hdr *hdr;
<a name="l00240"></a>00240   <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> nquestions, nanswers;
<a name="l00241"></a>00241   <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> i;
<a name="l00242"></a>00242   <span class="keyword">register</span> <span class="keyword">struct </span>namemap *namemapptr;
<a name="l00243"></a>00243   
<a name="l00244"></a>00244   hdr = (<span class="keyword">struct </span>dns_hdr *)<a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a>;
<a name="l00245"></a>00245   <span class="comment">/*  printf("ID %d\n", htons(hdr-&gt;id));</span>
<a name="l00246"></a>00246 <span class="comment">      printf("Query %d\n", hdr-&gt;flags1 &amp; DNS_FLAG1_RESPONSE);</span>
<a name="l00247"></a>00247 <span class="comment">      printf("Error %d\n", hdr-&gt;flags2 &amp; DNS_FLAG2_ERR_MASK);</span>
<a name="l00248"></a>00248 <span class="comment">      printf("Num questions %d, answers %d, authrr %d, extrarr %d\n",</span>
<a name="l00249"></a>00249 <span class="comment">      htons(hdr-&gt;numquestions),</span>
<a name="l00250"></a>00250 <span class="comment">      htons(hdr-&gt;numanswers),</span>
<a name="l00251"></a>00251 <span class="comment">      htons(hdr-&gt;numauthrr),</span>
<a name="l00252"></a>00252 <span class="comment">      htons(hdr-&gt;numextrarr));</span>
<a name="l00253"></a>00253 <span class="comment">  */</span>
<a name="l00254"></a>00254 
<a name="l00255"></a>00255   <span class="comment">/* The ID in the DNS header should be our entry into the name</span>
<a name="l00256"></a>00256 <span class="comment">     table. */</span>
<a name="l00257"></a>00257   i = <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(hdr-&gt;id);
<a name="l00258"></a>00258   namemapptr = &amp;names[i];
<a name="l00259"></a>00259   <span class="keywordflow">if</span>(i &lt; <a class="code" href="a00160.html#g221d37ccde7e3fd0dd2c2eb0a6b15493">RESOLV_ENTRIES</a> &amp;&amp;
<a name="l00260"></a>00260      namemapptr-&gt;state == <a class="code" href="a00102.html#55735650f879293d9b7b5fda6753d147">STATE_ASKING</a>) {
<a name="l00261"></a>00261 
<a name="l00262"></a>00262     <span class="comment">/* This entry is now finished. */</span>
<a name="l00263"></a>00263     namemapptr-&gt;state = <a class="code" href="a00102.html#876c82c946543cd70c141e41417138e0">STATE_DONE</a>;
<a name="l00264"></a>00264     namemapptr-&gt;err = hdr-&gt;flags2 &amp; <a class="code" href="a00102.html#9f6c329c04baba17fe0f5b2a6597d713">DNS_FLAG2_ERR_MASK</a>;
<a name="l00265"></a>00265 
<a name="l00266"></a>00266     <span class="comment">/* Check for error. If so, call callback to inform. */</span>
<a name="l00267"></a>00267     <span class="keywordflow">if</span>(namemapptr-&gt;err != 0) {
<a name="l00268"></a>00268       namemapptr-&gt;state = <a class="code" href="a00102.html#7bf0c086c7c41c12cc63324327932d91">STATE_ERROR</a>;
<a name="l00269"></a>00269       <a class="code" href="a00160.html#g6d9751d534453425c7a5a215d1d4414c">resolv_found</a>(namemapptr-&gt;name, <a class="code" href="a00160.html#g070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00270"></a>00270       <span class="keywordflow">return</span>;
<a name="l00271"></a>00271     }
<a name="l00272"></a>00272 
<a name="l00273"></a>00273     <span class="comment">/* We only care about the question(s) and the answers. The authrr</span>
<a name="l00274"></a>00274 <span class="comment">       and the extrarr are simply discarded. */</span>
<a name="l00275"></a>00275     nquestions = <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(hdr-&gt;numquestions);
<a name="l00276"></a>00276     nanswers = <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(hdr-&gt;numanswers);
<a name="l00277"></a>00277 
<a name="l00278"></a>00278     <span class="comment">/* Skip the name in the question. XXX: This should really be</span>
<a name="l00279"></a>00279 <span class="comment">       checked agains the name in the question, to be sure that they</span>
<a name="l00280"></a>00280 <span class="comment">       match. */</span>
<a name="l00281"></a>00281     nameptr = parse_name((<span class="keywordtype">char</span> *)<a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a> + 12) + 4;
<a name="l00282"></a>00282 
<a name="l00283"></a>00283     <span class="keywordflow">while</span>(nanswers &gt; 0) {
<a name="l00284"></a>00284       <span class="comment">/* The first byte in the answer resource record determines if it</span>
<a name="l00285"></a>00285 <span class="comment">         is a compressed record or a normal one. */</span>
<a name="l00286"></a>00286       <span class="keywordflow">if</span>(*nameptr &amp; 0xc0) {
<a name="l00287"></a>00287         <span class="comment">/* Compressed name. */</span>
<a name="l00288"></a>00288         nameptr +=2;
<a name="l00289"></a>00289         <span class="comment">/*      printf("Compressed anwser\n");*/</span>
<a name="l00290"></a>00290       } <span class="keywordflow">else</span> {
<a name="l00291"></a>00291         <span class="comment">/* Not compressed name. */</span>
<a name="l00292"></a>00292         nameptr = parse_name((<span class="keywordtype">char</span> *)nameptr);
<a name="l00293"></a>00293       }
<a name="l00294"></a>00294 
<a name="l00295"></a>00295       ans = (<span class="keyword">struct </span>dns_answer *)nameptr;
<a name="l00296"></a>00296       <span class="comment">/*      printf("Answer: type %x, class %x, ttl %x, length %x\n",</span>
<a name="l00297"></a>00297 <span class="comment">             htons(ans-&gt;type), htons(ans-&gt;class), (htons(ans-&gt;ttl[0])</span>
<a name="l00298"></a>00298 <span class="comment">             &lt;&lt; 16) | htons(ans-&gt;ttl[1]), htons(ans-&gt;len));*/</span>
<a name="l00299"></a>00299 
<a name="l00300"></a>00300       <span class="comment">/* Check for IP address type and Internet class. Others are</span>
<a name="l00301"></a>00301 <span class="comment">         discarded. */</span>
<a name="l00302"></a>00302       <span class="keywordflow">if</span>(ans-&gt;type == <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(1) &amp;&amp;
<a name="l00303"></a>00303          ans-&gt;class == <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(1) &amp;&amp;
<a name="l00304"></a>00304          ans-&gt;len == <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(4)) {
<a name="l00305"></a>00305         <span class="comment">/*      printf("IP address %d.%d.%d.%d\n",</span>
<a name="l00306"></a>00306 <span class="comment">               htons(ans-&gt;ipaddr[0]) &gt;&gt; 8,</span>
<a name="l00307"></a>00307 <span class="comment">               htons(ans-&gt;ipaddr[0]) &amp; 0xff,</span>
<a name="l00308"></a>00308 <span class="comment">               htons(ans-&gt;ipaddr[1]) &gt;&gt; 8,</span>
<a name="l00309"></a>00309 <span class="comment">               htons(ans-&gt;ipaddr[1]) &amp; 0xff);*/</span>
<a name="l00310"></a>00310         <span class="comment">/* XXX: we should really check that this IP address is the one</span>
<a name="l00311"></a>00311 <span class="comment">           we want. */</span>
<a name="l00312"></a>00312         namemapptr-&gt;ipaddr[0] = ans-&gt;ipaddr[0];
<a name="l00313"></a>00313         namemapptr-&gt;ipaddr[1] = ans-&gt;ipaddr[1];
<a name="l00314"></a>00314         
<a name="l00315"></a>00315         <a class="code" href="a00160.html#g6d9751d534453425c7a5a215d1d4414c">resolv_found</a>(namemapptr-&gt;name, namemapptr-&gt;ipaddr);
<a name="l00316"></a>00316         <span class="keywordflow">return</span>;
<a name="l00317"></a>00317       } <span class="keywordflow">else</span> {
<a name="l00318"></a>00318         nameptr = nameptr + 10 + <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(ans-&gt;len);
<a name="l00319"></a>00319       }
<a name="l00320"></a>00320       --nanswers;
<a name="l00321"></a>00321     }
<a name="l00322"></a>00322   }
<a name="l00323"></a>00323 
<a name="l00324"></a>00324 }
<a name="l00325"></a>00325 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
<a name="l00326"></a>00326 <span class="comment">/** \internal</span>
<a name="l00327"></a>00327 <span class="comment"> * The main UDP function.</span>
<a name="l00328"></a>00328 <span class="comment"> */</span>
<a name="l00329"></a>00329 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00330"></a>00330 <span class="keywordtype">void</span>
<a name="l00331"></a><a class="code" href="a00160.html#g7c5359305008e9183b18d6ab75f568bf">00331</a> <a class="code" href="a00160.html#g7c5359305008e9183b18d6ab75f568bf">resolv_appcall</a>(<span class="keywordtype">void</span>)
<a name="l00332"></a>00332 {
<a name="l00333"></a>00333   <span class="keywordflow">if</span>(<a class="code" href="a00095.html">uip_udp_conn</a>-&gt;rport == <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(53)) {
<a name="l00334"></a>00334     <span class="keywordflow">if</span>(<a class="code" href="a00147.html#g58bb90796c1cdad3aac2ecf44d87b20e">uip_poll</a>()) {
<a name="l00335"></a>00335       check_entries();
<a name="l00336"></a>00336     }
<a name="l00337"></a>00337     <span class="keywordflow">if</span>(<a class="code" href="a00147.html#g26a14b8dae3f861830af9e7cf1e03725">uip_newdata</a>()) {
<a name="l00338"></a>00338       newdata();
<a name="l00339"></a>00339     }
<a name="l00340"></a>00340   }
<a name="l00341"></a>00341 }
<a name="l00342"></a>00342 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
<a name="l00343"></a>00343 <span class="comment">/**</span>
<a name="l00344"></a>00344 <span class="comment"> * Queues a name so that a question for the name will be sent out.</span>
<a name="l00345"></a>00345 <span class="comment"> *</span>
<a name="l00346"></a>00346 <span class="comment"> * \param name The hostname that is to be queried.</span>
<a name="l00347"></a>00347 <span class="comment"> */</span>
<a name="l00348"></a>00348 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00349"></a>00349 <span class="keywordtype">void</span>