1*10465441SEvalZero<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 2*10465441SEvalZero<html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"> 3*10465441SEvalZero<title>uIP 1.0: apps/resolv/resolv.c Source File</title> 4*10465441SEvalZero<link href="doxygen.css" rel="stylesheet" type="text/css"> 5*10465441SEvalZero<link href="tabs.css" rel="stylesheet" type="text/css"> 6*10465441SEvalZero</head><body> 7*10465441SEvalZero<!-- Generated by Doxygen 1.4.6 --> 8*10465441SEvalZero<div class="tabs"> 9*10465441SEvalZero <ul> 10*10465441SEvalZero <li><a href="main.html"><span>Main Page</span></a></li> 11*10465441SEvalZero <li><a href="modules.html"><span>Modules</span></a></li> 12*10465441SEvalZero <li><a href="classes.html"><span>Data Structures</span></a></li> 13*10465441SEvalZero <li id="current"><a href="files.html"><span>Files</span></a></li> 14*10465441SEvalZero <li><a href="examples.html"><span>Examples</span></a></li> 15*10465441SEvalZero </ul></div> 16*10465441SEvalZero<div class="tabs"> 17*10465441SEvalZero <ul> 18*10465441SEvalZero <li><a href="files.html"><span>File List</span></a></li> 19*10465441SEvalZero <li><a href="globals.html"><span>Globals</span></a></li> 20*10465441SEvalZero </ul></div> 21*10465441SEvalZero<h1>apps/resolv/resolv.c</h1><a href="a00102.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/**</span> 22*10465441SEvalZero<a name="l00002"></a>00002 <span class="comment"> * \addtogroup apps</span> 23*10465441SEvalZero<a name="l00003"></a>00003 <span class="comment"> * @{</span> 24*10465441SEvalZero<a name="l00004"></a>00004 <span class="comment"> */</span> 25*10465441SEvalZero<a name="l00005"></a>00005 <span class="comment"></span> 26*10465441SEvalZero<a name="l00006"></a>00006 <span class="comment">/**</span> 27*10465441SEvalZero<a name="l00007"></a>00007 <span class="comment"> * \defgroup resolv DNS resolver</span> 28*10465441SEvalZero<a name="l00008"></a>00008 <span class="comment"> * @{</span> 29*10465441SEvalZero<a name="l00009"></a>00009 <span class="comment"> *</span> 30*10465441SEvalZero<a name="l00010"></a>00010 <span class="comment"> * The uIP DNS resolver functions are used to lookup a hostname and</span> 31*10465441SEvalZero<a name="l00011"></a>00011 <span class="comment"> * map it to a numerical IP address. It maintains a list of resolved</span> 32*10465441SEvalZero<a name="l00012"></a>00012 <span class="comment"> * hostnames that can be queried with the resolv_lookup()</span> 33*10465441SEvalZero<a name="l00013"></a>00013 <span class="comment"> * function. New hostnames can be resolved using the resolv_query()</span> 34*10465441SEvalZero<a name="l00014"></a>00014 <span class="comment"> * function.</span> 35*10465441SEvalZero<a name="l00015"></a>00015 <span class="comment"> *</span> 36*10465441SEvalZero<a name="l00016"></a>00016 <span class="comment"> * When a hostname has been resolved (or found to be non-existant),</span> 37*10465441SEvalZero<a name="l00017"></a>00017 <span class="comment"> * the resolver code calls a callback function called resolv_found()</span> 38*10465441SEvalZero<a name="l00018"></a>00018 <span class="comment"> * that must be implemented by the module that uses the resolver.</span> 39*10465441SEvalZero<a name="l00019"></a>00019 <span class="comment"> */</span> 40*10465441SEvalZero<a name="l00020"></a>00020 <span class="comment"></span> 41*10465441SEvalZero<a name="l00021"></a>00021 <span class="comment">/**</span> 42*10465441SEvalZero<a name="l00022"></a>00022 <span class="comment"> * \file</span> 43*10465441SEvalZero<a name="l00023"></a>00023 <span class="comment"> * DNS host name to IP address resolver.</span> 44*10465441SEvalZero<a name="l00024"></a>00024 <span class="comment"> * \author Adam Dunkels <[email protected]></span> 45*10465441SEvalZero<a name="l00025"></a>00025 <span class="comment"> *</span> 46*10465441SEvalZero<a name="l00026"></a>00026 <span class="comment"> * This file implements a DNS host name to IP address resolver.</span> 47*10465441SEvalZero<a name="l00027"></a>00027 <span class="comment"> */</span> 48*10465441SEvalZero<a name="l00028"></a>00028 49*10465441SEvalZero<a name="l00029"></a>00029 <span class="comment">/*</span> 50*10465441SEvalZero<a name="l00030"></a>00030 <span class="comment"> * Copyright (c) 2002-2003, Adam Dunkels.</span> 51*10465441SEvalZero<a name="l00031"></a>00031 <span class="comment"> * All rights reserved.</span> 52*10465441SEvalZero<a name="l00032"></a>00032 <span class="comment"> *</span> 53*10465441SEvalZero<a name="l00033"></a>00033 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span> 54*10465441SEvalZero<a name="l00034"></a>00034 <span class="comment"> * modification, are permitted provided that the following conditions</span> 55*10465441SEvalZero<a name="l00035"></a>00035 <span class="comment"> * are met:</span> 56*10465441SEvalZero<a name="l00036"></a>00036 <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span> 57*10465441SEvalZero<a name="l00037"></a>00037 <span class="comment"> * notice, this list of conditions and the following disclaimer.</span> 58*10465441SEvalZero<a name="l00038"></a>00038 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span> 59*10465441SEvalZero<a name="l00039"></a>00039 <span class="comment"> * notice, this list of conditions and the following disclaimer in the</span> 60*10465441SEvalZero<a name="l00040"></a>00040 <span class="comment"> * documentation and/or other materials provided with the distribution.</span> 61*10465441SEvalZero<a name="l00041"></a>00041 <span class="comment"> * 3. The name of the author may not be used to endorse or promote</span> 62*10465441SEvalZero<a name="l00042"></a>00042 <span class="comment"> * products derived from this software without specific prior</span> 63*10465441SEvalZero<a name="l00043"></a>00043 <span class="comment"> * written permission.</span> 64*10465441SEvalZero<a name="l00044"></a>00044 <span class="comment"> *</span> 65*10465441SEvalZero<a name="l00045"></a>00045 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS</span> 66*10465441SEvalZero<a name="l00046"></a>00046 <span class="comment"> * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED</span> 67*10465441SEvalZero<a name="l00047"></a>00047 <span class="comment"> * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span> 68*10465441SEvalZero<a name="l00048"></a>00048 <span class="comment"> * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY</span> 69*10465441SEvalZero<a name="l00049"></a>00049 <span class="comment"> * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL</span> 70*10465441SEvalZero<a name="l00050"></a>00050 <span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE</span> 71*10465441SEvalZero<a name="l00051"></a>00051 <span class="comment"> * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span> 72*10465441SEvalZero<a name="l00052"></a>00052 <span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,</span> 73*10465441SEvalZero<a name="l00053"></a>00053 <span class="comment"> * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING</span> 74*10465441SEvalZero<a name="l00054"></a>00054 <span class="comment"> * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS</span> 75*10465441SEvalZero<a name="l00055"></a>00055 <span class="comment"> * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span> 76*10465441SEvalZero<a name="l00056"></a>00056 <span class="comment"> *</span> 77*10465441SEvalZero<a name="l00057"></a>00057 <span class="comment"> * This file is part of the uIP TCP/IP stack.</span> 78*10465441SEvalZero<a name="l00058"></a>00058 <span class="comment"> *</span> 79*10465441SEvalZero<a name="l00059"></a>00059 <span class="comment"> * $Id: resolv.c,v 1.5 2006/06/11 21:46:37 adam Exp $</span> 80*10465441SEvalZero<a name="l00060"></a>00060 <span class="comment"> *</span> 81*10465441SEvalZero<a name="l00061"></a>00061 <span class="comment"> */</span> 82*10465441SEvalZero<a name="l00062"></a>00062 83*10465441SEvalZero<a name="l00063"></a>00063 <span class="preprocessor">#include "<a class="code" href="a00103.html">resolv.h</a>"</span> 84*10465441SEvalZero<a name="l00064"></a>00064 <span class="preprocessor">#include "<a class="code" href="a00136.html">uip.h</a>"</span> 85*10465441SEvalZero<a name="l00065"></a>00065 86*10465441SEvalZero<a name="l00066"></a>00066 <span class="preprocessor">#include <string.h></span> 87*10465441SEvalZero<a name="l00067"></a>00067 88*10465441SEvalZero<a name="l00068"></a>00068 <span class="preprocessor">#ifndef NULL</span> 89*10465441SEvalZero<a name="l00069"></a><a class="code" href="a00160.html#g070d2ce7b6bb7e5c05602aa8c308d0c4">00069</a> <span class="preprocessor"></span><span class="preprocessor">#define NULL (void *)0</span> 90*10465441SEvalZero<a name="l00070"></a>00070 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* NULL */</span> 91*10465441SEvalZero<a name="l00071"></a>00071 <span class="comment"></span> 92*10465441SEvalZero<a name="l00072"></a>00072 <span class="comment">/** \internal The maximum number of retries when asking for a name. */</span> 93*10465441SEvalZero<a name="l00073"></a><a class="code" href="a00160.html#gecf13b8dc783db2202ca5c34fe117fc3">00073</a> <span class="preprocessor">#define MAX_RETRIES 8</span> 94*10465441SEvalZero<a name="l00074"></a>00074 <span class="preprocessor"></span><span class="comment"></span> 95*10465441SEvalZero<a name="l00075"></a>00075 <span class="comment">/** \internal The DNS message header. */</span> 96*10465441SEvalZero<a name="l00076"></a>00076 <span class="keyword">struct </span>dns_hdr { 97*10465441SEvalZero<a name="l00077"></a>00077 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> id; 98*10465441SEvalZero<a name="l00078"></a>00078 <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> flags1, flags2; 99*10465441SEvalZero<a name="l00079"></a><a class="code" href="a00102.html#96eb4534b574ece96ed36806039f73d3">00079</a> <span class="preprocessor">#define DNS_FLAG1_RESPONSE 0x80</span> 100*10465441SEvalZero<a name="l00080"></a><a class="code" href="a00102.html#4350350ce0d4595876743d4c0a720bcc">00080</a> <span class="preprocessor"></span><span class="preprocessor">#define DNS_FLAG1_OPCODE_STATUS 0x10</span> 101*10465441SEvalZero<a name="l00081"></a><a class="code" href="a00102.html#e7250008b68d1909d54040515eef8ebb">00081</a> <span class="preprocessor"></span><span class="preprocessor">#define DNS_FLAG1_OPCODE_INVERSE 0x08</span> 102*10465441SEvalZero<a name="l00082"></a><a class="code" href="a00102.html#6a327c0ffd40f69fbcd5f01f12e5745c">00082</a> <span class="preprocessor"></span><span class="preprocessor">#define DNS_FLAG1_OPCODE_STANDARD 0x00</span> 103*10465441SEvalZero<a name="l00083"></a><a class="code" href="a00102.html#dd685a0f8b5e76a2687cc0f306813bfb">00083</a> <span class="preprocessor"></span><span class="preprocessor">#define DNS_FLAG1_AUTHORATIVE 0x04</span> 104*10465441SEvalZero<a name="l00084"></a><a class="code" href="a00102.html#2e52037249bb98d7bbecf42e275beb07">00084</a> <span class="preprocessor"></span><span class="preprocessor">#define DNS_FLAG1_TRUNC 0x02</span> 105*10465441SEvalZero<a name="l00085"></a><a class="code" href="a00102.html#72d99b1623afa14bd58c667b748c2ddc">00085</a> <span class="preprocessor"></span><span class="preprocessor">#define DNS_FLAG1_RD 0x01</span> 106*10465441SEvalZero<a name="l00086"></a><a class="code" href="a00102.html#c72f8777ccc45ae274449ea7a9f3de04">00086</a> <span class="preprocessor"></span><span class="preprocessor">#define DNS_FLAG2_RA 0x80</span> 107*10465441SEvalZero<a name="l00087"></a><a class="code" href="a00102.html#9f6c329c04baba17fe0f5b2a6597d713">00087</a> <span class="preprocessor"></span><span class="preprocessor">#define DNS_FLAG2_ERR_MASK 0x0f</span> 108*10465441SEvalZero<a name="l00088"></a><a class="code" href="a00102.html#6aaa9da3d0f8d4c0799516d46d939942">00088</a> <span class="preprocessor"></span><span class="preprocessor">#define DNS_FLAG2_ERR_NONE 0x00</span> 109*10465441SEvalZero<a name="l00089"></a><a class="code" href="a00102.html#8ee5e2c8e517d6e4f2198057f81e93c6">00089</a> <span class="preprocessor"></span><span class="preprocessor">#define DNS_FLAG2_ERR_NAME 0x03</span> 110*10465441SEvalZero<a name="l00090"></a>00090 <span class="preprocessor"></span> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> numquestions; 111*10465441SEvalZero<a name="l00091"></a>00091 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> numanswers; 112*10465441SEvalZero<a name="l00092"></a>00092 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> numauthrr; 113*10465441SEvalZero<a name="l00093"></a>00093 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> numextrarr; 114*10465441SEvalZero<a name="l00094"></a>00094 }; 115*10465441SEvalZero<a name="l00095"></a>00095 <span class="comment"></span> 116*10465441SEvalZero<a name="l00096"></a>00096 <span class="comment">/** \internal The DNS answer message structure. */</span> 117*10465441SEvalZero<a name="l00097"></a>00097 <span class="keyword">struct </span>dns_answer { 118*10465441SEvalZero<a name="l00098"></a>00098 <span class="comment">/* DNS answer record starts with either a domain name or a pointer</span> 119*10465441SEvalZero<a name="l00099"></a>00099 <span class="comment"> to a name already present somewhere in the packet. */</span> 120*10465441SEvalZero<a name="l00100"></a>00100 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> type; 121*10465441SEvalZero<a name="l00101"></a>00101 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> <span class="keyword">class</span>; 122*10465441SEvalZero<a name="l00102"></a>00102 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> ttl[2]; 123*10465441SEvalZero<a name="l00103"></a>00103 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> len; 124*10465441SEvalZero<a name="l00104"></a>00104 <a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> ipaddr; 125*10465441SEvalZero<a name="l00105"></a>00105 }; 126*10465441SEvalZero<a name="l00106"></a>00106 127*10465441SEvalZero<a name="l00107"></a>00107 <span class="keyword">struct </span>namemap { 128*10465441SEvalZero<a name="l00108"></a><a class="code" href="a00102.html#ee60b8757bacab269b0ccd7c240bf01d">00108</a> <span class="preprocessor">#define STATE_UNUSED 0</span> 129*10465441SEvalZero<a name="l00109"></a><a class="code" href="a00102.html#bf4401501f1389872141a78b63f325a3">00109</a> <span class="preprocessor"></span><span class="preprocessor">#define STATE_NEW 1</span> 130*10465441SEvalZero<a name="l00110"></a><a class="code" href="a00102.html#55735650f879293d9b7b5fda6753d147">00110</a> <span class="preprocessor"></span><span class="preprocessor">#define STATE_ASKING 2</span> 131*10465441SEvalZero<a name="l00111"></a><a class="code" href="a00102.html#876c82c946543cd70c141e41417138e0">00111</a> <span class="preprocessor"></span><span class="preprocessor">#define STATE_DONE 3</span> 132*10465441SEvalZero<a name="l00112"></a><a class="code" href="a00102.html#7bf0c086c7c41c12cc63324327932d91">00112</a> <span class="preprocessor"></span><span class="preprocessor">#define STATE_ERROR 4</span> 133*10465441SEvalZero<a name="l00113"></a>00113 <span class="preprocessor"></span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> state; 134*10465441SEvalZero<a name="l00114"></a>00114 <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> tmr; 135*10465441SEvalZero<a name="l00115"></a>00115 <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> retries; 136*10465441SEvalZero<a name="l00116"></a>00116 <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> seqno; 137*10465441SEvalZero<a name="l00117"></a>00117 <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> err; 138*10465441SEvalZero<a name="l00118"></a>00118 <span class="keywordtype">char</span> name[32]; 139*10465441SEvalZero<a name="l00119"></a>00119 <a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> ipaddr; 140*10465441SEvalZero<a name="l00120"></a>00120 }; 141*10465441SEvalZero<a name="l00121"></a>00121 142*10465441SEvalZero<a name="l00122"></a>00122 <span class="preprocessor">#ifndef UIP_CONF_RESOLV_ENTRIES</span> 143*10465441SEvalZero<a name="l00123"></a><a class="code" href="a00160.html#g221d37ccde7e3fd0dd2c2eb0a6b15493">00123</a> <span class="preprocessor"></span><span class="preprocessor">#define RESOLV_ENTRIES 4</span> 144*10465441SEvalZero<a name="l00124"></a>00124 <span class="preprocessor"></span><span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_RESOLV_ENTRIES */</span> 145*10465441SEvalZero<a name="l00125"></a>00125 <span class="preprocessor">#define RESOLV_ENTRIES UIP_CONF_RESOLV_ENTRIES</span> 146*10465441SEvalZero<a name="l00126"></a>00126 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_RESOLV_ENTRIES */</span> 147*10465441SEvalZero<a name="l00127"></a>00127 148*10465441SEvalZero<a name="l00128"></a>00128 149*10465441SEvalZero<a name="l00129"></a>00129 <span class="keyword">static</span> <span class="keyword">struct </span>namemap names[<a class="code" href="a00160.html#g221d37ccde7e3fd0dd2c2eb0a6b15493">RESOLV_ENTRIES</a>]; 150*10465441SEvalZero<a name="l00130"></a>00130 151*10465441SEvalZero<a name="l00131"></a>00131 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> seqno; 152*10465441SEvalZero<a name="l00132"></a>00132 153*10465441SEvalZero<a name="l00133"></a>00133 <span class="keyword">static</span> <span class="keyword">struct </span><a class="code" href="a00095.html">uip_udp_conn</a> *resolv_conn = <a class="code" href="a00160.html#g070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>; 154*10465441SEvalZero<a name="l00134"></a>00134 155*10465441SEvalZero<a name="l00135"></a>00135 156*10465441SEvalZero<a name="l00136"></a>00136 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span> 157*10465441SEvalZero<a name="l00137"></a>00137 <span class="comment">/** \internal</span> 158*10465441SEvalZero<a name="l00138"></a>00138 <span class="comment"> * Walk through a compact encoded DNS name and return the end of it.</span> 159*10465441SEvalZero<a name="l00139"></a>00139 <span class="comment"> *</span> 160*10465441SEvalZero<a name="l00140"></a>00140 <span class="comment"> * \return The end of the name.</span> 161*10465441SEvalZero<a name="l00141"></a>00141 <span class="comment"> */</span> 162*10465441SEvalZero<a name="l00142"></a>00142 <span class="comment">/*---------------------------------------------------------------------------*/</span> 163*10465441SEvalZero<a name="l00143"></a>00143 <span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> * 164*10465441SEvalZero<a name="l00144"></a>00144 parse_name(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *query) 165*10465441SEvalZero<a name="l00145"></a>00145 { 166*10465441SEvalZero<a name="l00146"></a>00146 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> n; 167*10465441SEvalZero<a name="l00147"></a>00147 168*10465441SEvalZero<a name="l00148"></a>00148 <span class="keywordflow">do</span> { 169*10465441SEvalZero<a name="l00149"></a>00149 n = *query++; 170*10465441SEvalZero<a name="l00150"></a>00150 171*10465441SEvalZero<a name="l00151"></a>00151 <span class="keywordflow">while</span>(n > 0) { 172*10465441SEvalZero<a name="l00152"></a>00152 <span class="comment">/* printf("%c", *query);*/</span> 173*10465441SEvalZero<a name="l00153"></a>00153 ++query; 174*10465441SEvalZero<a name="l00154"></a>00154 --n; 175*10465441SEvalZero<a name="l00155"></a>00155 }; 176*10465441SEvalZero<a name="l00156"></a>00156 <span class="comment">/* printf(".");*/</span> 177*10465441SEvalZero<a name="l00157"></a>00157 } <span class="keywordflow">while</span>(*query != 0); 178*10465441SEvalZero<a name="l00158"></a>00158 <span class="comment">/* printf("\n");*/</span> 179*10465441SEvalZero<a name="l00159"></a>00159 <span class="keywordflow">return</span> query + 1; 180*10465441SEvalZero<a name="l00160"></a>00160 } 181*10465441SEvalZero<a name="l00161"></a>00161 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span> 182*10465441SEvalZero<a name="l00162"></a>00162 <span class="comment">/** \internal</span> 183*10465441SEvalZero<a name="l00163"></a>00163 <span class="comment"> * Runs through the list of names to see if there are any that have</span> 184*10465441SEvalZero<a name="l00164"></a>00164 <span class="comment"> * not yet been queried and, if so, sends out a query.</span> 185*10465441SEvalZero<a name="l00165"></a>00165 <span class="comment"> */</span> 186*10465441SEvalZero<a name="l00166"></a>00166 <span class="comment">/*---------------------------------------------------------------------------*/</span> 187*10465441SEvalZero<a name="l00167"></a>00167 <span class="keyword">static</span> <span class="keywordtype">void</span> 188*10465441SEvalZero<a name="l00168"></a>00168 check_entries(<span class="keywordtype">void</span>) 189*10465441SEvalZero<a name="l00169"></a>00169 { 190*10465441SEvalZero<a name="l00170"></a>00170 <span class="keyword">register</span> <span class="keyword">struct </span>dns_hdr *hdr; 191*10465441SEvalZero<a name="l00171"></a>00171 <span class="keywordtype">char</span> *query, *nptr, *nameptr; 192*10465441SEvalZero<a name="l00172"></a>00172 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> i; 193*10465441SEvalZero<a name="l00173"></a>00173 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> n; 194*10465441SEvalZero<a name="l00174"></a>00174 <span class="keyword">register</span> <span class="keyword">struct </span>namemap *namemapptr; 195*10465441SEvalZero<a name="l00175"></a>00175 196*10465441SEvalZero<a name="l00176"></a>00176 <span class="keywordflow">for</span>(i = 0; i < <a class="code" href="a00160.html#g221d37ccde7e3fd0dd2c2eb0a6b15493">RESOLV_ENTRIES</a>; ++i) { 197*10465441SEvalZero<a name="l00177"></a>00177 namemapptr = &names[i]; 198*10465441SEvalZero<a name="l00178"></a>00178 <span class="keywordflow">if</span>(namemapptr->state == <a class="code" href="a00102.html#bf4401501f1389872141a78b63f325a3">STATE_NEW</a> || 199*10465441SEvalZero<a name="l00179"></a>00179 namemapptr->state == <a class="code" href="a00102.html#55735650f879293d9b7b5fda6753d147">STATE_ASKING</a>) { 200*10465441SEvalZero<a name="l00180"></a>00180 <span class="keywordflow">if</span>(namemapptr->state == <a class="code" href="a00102.html#55735650f879293d9b7b5fda6753d147">STATE_ASKING</a>) { 201*10465441SEvalZero<a name="l00181"></a>00181 <span class="keywordflow">if</span>(--namemapptr->tmr == 0) { 202*10465441SEvalZero<a name="l00182"></a>00182 <span class="keywordflow">if</span>(++namemapptr->retries == <a class="code" href="a00160.html#gecf13b8dc783db2202ca5c34fe117fc3">MAX_RETRIES</a>) { 203*10465441SEvalZero<a name="l00183"></a>00183 namemapptr->state = <a class="code" href="a00102.html#7bf0c086c7c41c12cc63324327932d91">STATE_ERROR</a>; 204*10465441SEvalZero<a name="l00184"></a>00184 <a class="code" href="a00160.html#g6d9751d534453425c7a5a215d1d4414c">resolv_found</a>(namemapptr->name, <a class="code" href="a00160.html#g070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>); 205*10465441SEvalZero<a name="l00185"></a>00185 <span class="keywordflow">continue</span>; 206*10465441SEvalZero<a name="l00186"></a>00186 } 207*10465441SEvalZero<a name="l00187"></a>00187 namemapptr->tmr = namemapptr->retries; 208*10465441SEvalZero<a name="l00188"></a>00188 } <span class="keywordflow">else</span> { 209*10465441SEvalZero<a name="l00189"></a>00189 <span class="comment">/* printf("Timer %d\n", namemapptr->tmr);*/</span> 210*10465441SEvalZero<a name="l00190"></a>00190 <span class="comment">/* Its timer has not run out, so we move on to next</span> 211*10465441SEvalZero<a name="l00191"></a>00191 <span class="comment"> entry. */</span> 212*10465441SEvalZero<a name="l00192"></a>00192 <span class="keywordflow">continue</span>; 213*10465441SEvalZero<a name="l00193"></a>00193 } 214*10465441SEvalZero<a name="l00194"></a>00194 } <span class="keywordflow">else</span> { 215*10465441SEvalZero<a name="l00195"></a>00195 namemapptr->state = <a class="code" href="a00102.html#55735650f879293d9b7b5fda6753d147">STATE_ASKING</a>; 216*10465441SEvalZero<a name="l00196"></a>00196 namemapptr->tmr = 1; 217*10465441SEvalZero<a name="l00197"></a>00197 namemapptr->retries = 0; 218*10465441SEvalZero<a name="l00198"></a>00198 } 219*10465441SEvalZero<a name="l00199"></a>00199 hdr = (<span class="keyword">struct </span>dns_hdr *)<a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a>; 220*10465441SEvalZero<a name="l00200"></a>00200 memset(hdr, 0, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> dns_hdr)); 221*10465441SEvalZero<a name="l00201"></a>00201 hdr->id = <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(i); 222*10465441SEvalZero<a name="l00202"></a>00202 hdr->flags1 = <a class="code" href="a00102.html#72d99b1623afa14bd58c667b748c2ddc">DNS_FLAG1_RD</a>; 223*10465441SEvalZero<a name="l00203"></a>00203 hdr->numquestions = <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(1); 224*10465441SEvalZero<a name="l00204"></a>00204 query = (<span class="keywordtype">char</span> *)<a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a> + 12; 225*10465441SEvalZero<a name="l00205"></a>00205 nameptr = namemapptr->name; 226*10465441SEvalZero<a name="l00206"></a>00206 --nameptr; 227*10465441SEvalZero<a name="l00207"></a>00207 <span class="comment">/* Convert hostname into suitable query format. */</span> 228*10465441SEvalZero<a name="l00208"></a>00208 <span class="keywordflow">do</span> { 229*10465441SEvalZero<a name="l00209"></a>00209 ++nameptr; 230*10465441SEvalZero<a name="l00210"></a>00210 nptr = query; 231*10465441SEvalZero<a name="l00211"></a>00211 ++query; 232*10465441SEvalZero<a name="l00212"></a>00212 <span class="keywordflow">for</span>(n = 0; *nameptr != <span class="charliteral">'.'</span> && *nameptr != 0; ++nameptr) { 233*10465441SEvalZero<a name="l00213"></a>00213 *query = *nameptr; 234*10465441SEvalZero<a name="l00214"></a>00214 ++query; 235*10465441SEvalZero<a name="l00215"></a>00215 ++n; 236*10465441SEvalZero<a name="l00216"></a>00216 } 237*10465441SEvalZero<a name="l00217"></a>00217 *nptr = n; 238*10465441SEvalZero<a name="l00218"></a>00218 } <span class="keywordflow">while</span>(*nameptr != 0); 239*10465441SEvalZero<a name="l00219"></a>00219 { 240*10465441SEvalZero<a name="l00220"></a>00220 <span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> endquery[] = 241*10465441SEvalZero<a name="l00221"></a>00221 {0,0,1,0,1}; 242*10465441SEvalZero<a name="l00222"></a>00222 memcpy(query, endquery, 5); 243*10465441SEvalZero<a name="l00223"></a>00223 } 244*10465441SEvalZero<a name="l00224"></a>00224 <a class="code" href="a00147.html#ge5ab69d40013e6cf86ef1763c95d920e">uip_udp_send</a>((<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>)(query + 5 - (<span class="keywordtype">char</span> *)<a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a>)); 245*10465441SEvalZero<a name="l00225"></a>00225 <span class="keywordflow">break</span>; 246*10465441SEvalZero<a name="l00226"></a>00226 } 247*10465441SEvalZero<a name="l00227"></a>00227 } 248*10465441SEvalZero<a name="l00228"></a>00228 } 249*10465441SEvalZero<a name="l00229"></a>00229 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span> 250*10465441SEvalZero<a name="l00230"></a>00230 <span class="comment">/** \internal</span> 251*10465441SEvalZero<a name="l00231"></a>00231 <span class="comment"> * Called when new UDP data arrives.</span> 252*10465441SEvalZero<a name="l00232"></a>00232 <span class="comment"> */</span> 253*10465441SEvalZero<a name="l00233"></a>00233 <span class="comment">/*---------------------------------------------------------------------------*/</span> 254*10465441SEvalZero<a name="l00234"></a>00234 <span class="keyword">static</span> <span class="keywordtype">void</span> 255*10465441SEvalZero<a name="l00235"></a>00235 newdata(<span class="keywordtype">void</span>) 256*10465441SEvalZero<a name="l00236"></a>00236 { 257*10465441SEvalZero<a name="l00237"></a>00237 <span class="keywordtype">char</span> *nameptr; 258*10465441SEvalZero<a name="l00238"></a>00238 <span class="keyword">struct </span>dns_answer *ans; 259*10465441SEvalZero<a name="l00239"></a>00239 <span class="keyword">struct </span>dns_hdr *hdr; 260*10465441SEvalZero<a name="l00240"></a>00240 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> nquestions, nanswers; 261*10465441SEvalZero<a name="l00241"></a>00241 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> i; 262*10465441SEvalZero<a name="l00242"></a>00242 <span class="keyword">register</span> <span class="keyword">struct </span>namemap *namemapptr; 263*10465441SEvalZero<a name="l00243"></a>00243 264*10465441SEvalZero<a name="l00244"></a>00244 hdr = (<span class="keyword">struct </span>dns_hdr *)<a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a>; 265*10465441SEvalZero<a name="l00245"></a>00245 <span class="comment">/* printf("ID %d\n", htons(hdr->id));</span> 266*10465441SEvalZero<a name="l00246"></a>00246 <span class="comment"> printf("Query %d\n", hdr->flags1 & DNS_FLAG1_RESPONSE);</span> 267*10465441SEvalZero<a name="l00247"></a>00247 <span class="comment"> printf("Error %d\n", hdr->flags2 & DNS_FLAG2_ERR_MASK);</span> 268*10465441SEvalZero<a name="l00248"></a>00248 <span class="comment"> printf("Num questions %d, answers %d, authrr %d, extrarr %d\n",</span> 269*10465441SEvalZero<a name="l00249"></a>00249 <span class="comment"> htons(hdr->numquestions),</span> 270*10465441SEvalZero<a name="l00250"></a>00250 <span class="comment"> htons(hdr->numanswers),</span> 271*10465441SEvalZero<a name="l00251"></a>00251 <span class="comment"> htons(hdr->numauthrr),</span> 272*10465441SEvalZero<a name="l00252"></a>00252 <span class="comment"> htons(hdr->numextrarr));</span> 273*10465441SEvalZero<a name="l00253"></a>00253 <span class="comment"> */</span> 274*10465441SEvalZero<a name="l00254"></a>00254 275*10465441SEvalZero<a name="l00255"></a>00255 <span class="comment">/* The ID in the DNS header should be our entry into the name</span> 276*10465441SEvalZero<a name="l00256"></a>00256 <span class="comment"> table. */</span> 277*10465441SEvalZero<a name="l00257"></a>00257 i = <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(hdr->id); 278*10465441SEvalZero<a name="l00258"></a>00258 namemapptr = &names[i]; 279*10465441SEvalZero<a name="l00259"></a>00259 <span class="keywordflow">if</span>(i < <a class="code" href="a00160.html#g221d37ccde7e3fd0dd2c2eb0a6b15493">RESOLV_ENTRIES</a> && 280*10465441SEvalZero<a name="l00260"></a>00260 namemapptr->state == <a class="code" href="a00102.html#55735650f879293d9b7b5fda6753d147">STATE_ASKING</a>) { 281*10465441SEvalZero<a name="l00261"></a>00261 282*10465441SEvalZero<a name="l00262"></a>00262 <span class="comment">/* This entry is now finished. */</span> 283*10465441SEvalZero<a name="l00263"></a>00263 namemapptr->state = <a class="code" href="a00102.html#876c82c946543cd70c141e41417138e0">STATE_DONE</a>; 284*10465441SEvalZero<a name="l00264"></a>00264 namemapptr->err = hdr->flags2 & <a class="code" href="a00102.html#9f6c329c04baba17fe0f5b2a6597d713">DNS_FLAG2_ERR_MASK</a>; 285*10465441SEvalZero<a name="l00265"></a>00265 286*10465441SEvalZero<a name="l00266"></a>00266 <span class="comment">/* Check for error. If so, call callback to inform. */</span> 287*10465441SEvalZero<a name="l00267"></a>00267 <span class="keywordflow">if</span>(namemapptr->err != 0) { 288*10465441SEvalZero<a name="l00268"></a>00268 namemapptr->state = <a class="code" href="a00102.html#7bf0c086c7c41c12cc63324327932d91">STATE_ERROR</a>; 289*10465441SEvalZero<a name="l00269"></a>00269 <a class="code" href="a00160.html#g6d9751d534453425c7a5a215d1d4414c">resolv_found</a>(namemapptr->name, <a class="code" href="a00160.html#g070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>); 290*10465441SEvalZero<a name="l00270"></a>00270 <span class="keywordflow">return</span>; 291*10465441SEvalZero<a name="l00271"></a>00271 } 292*10465441SEvalZero<a name="l00272"></a>00272 293*10465441SEvalZero<a name="l00273"></a>00273 <span class="comment">/* We only care about the question(s) and the answers. The authrr</span> 294*10465441SEvalZero<a name="l00274"></a>00274 <span class="comment"> and the extrarr are simply discarded. */</span> 295*10465441SEvalZero<a name="l00275"></a>00275 nquestions = <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(hdr->numquestions); 296*10465441SEvalZero<a name="l00276"></a>00276 nanswers = <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(hdr->numanswers); 297*10465441SEvalZero<a name="l00277"></a>00277 298*10465441SEvalZero<a name="l00278"></a>00278 <span class="comment">/* Skip the name in the question. XXX: This should really be</span> 299*10465441SEvalZero<a name="l00279"></a>00279 <span class="comment"> checked agains the name in the question, to be sure that they</span> 300*10465441SEvalZero<a name="l00280"></a>00280 <span class="comment"> match. */</span> 301*10465441SEvalZero<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; 302*10465441SEvalZero<a name="l00282"></a>00282 303*10465441SEvalZero<a name="l00283"></a>00283 <span class="keywordflow">while</span>(nanswers > 0) { 304*10465441SEvalZero<a name="l00284"></a>00284 <span class="comment">/* The first byte in the answer resource record determines if it</span> 305*10465441SEvalZero<a name="l00285"></a>00285 <span class="comment"> is a compressed record or a normal one. */</span> 306*10465441SEvalZero<a name="l00286"></a>00286 <span class="keywordflow">if</span>(*nameptr & 0xc0) { 307*10465441SEvalZero<a name="l00287"></a>00287 <span class="comment">/* Compressed name. */</span> 308*10465441SEvalZero<a name="l00288"></a>00288 nameptr +=2; 309*10465441SEvalZero<a name="l00289"></a>00289 <span class="comment">/* printf("Compressed anwser\n");*/</span> 310*10465441SEvalZero<a name="l00290"></a>00290 } <span class="keywordflow">else</span> { 311*10465441SEvalZero<a name="l00291"></a>00291 <span class="comment">/* Not compressed name. */</span> 312*10465441SEvalZero<a name="l00292"></a>00292 nameptr = parse_name((<span class="keywordtype">char</span> *)nameptr); 313*10465441SEvalZero<a name="l00293"></a>00293 } 314*10465441SEvalZero<a name="l00294"></a>00294 315*10465441SEvalZero<a name="l00295"></a>00295 ans = (<span class="keyword">struct </span>dns_answer *)nameptr; 316*10465441SEvalZero<a name="l00296"></a>00296 <span class="comment">/* printf("Answer: type %x, class %x, ttl %x, length %x\n",</span> 317*10465441SEvalZero<a name="l00297"></a>00297 <span class="comment"> htons(ans->type), htons(ans->class), (htons(ans->ttl[0])</span> 318*10465441SEvalZero<a name="l00298"></a>00298 <span class="comment"> << 16) | htons(ans->ttl[1]), htons(ans->len));*/</span> 319*10465441SEvalZero<a name="l00299"></a>00299 320*10465441SEvalZero<a name="l00300"></a>00300 <span class="comment">/* Check for IP address type and Internet class. Others are</span> 321*10465441SEvalZero<a name="l00301"></a>00301 <span class="comment"> discarded. */</span> 322*10465441SEvalZero<a name="l00302"></a>00302 <span class="keywordflow">if</span>(ans->type == <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(1) && 323*10465441SEvalZero<a name="l00303"></a>00303 ans->class == <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(1) && 324*10465441SEvalZero<a name="l00304"></a>00304 ans->len == <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(4)) { 325*10465441SEvalZero<a name="l00305"></a>00305 <span class="comment">/* printf("IP address %d.%d.%d.%d\n",</span> 326*10465441SEvalZero<a name="l00306"></a>00306 <span class="comment"> htons(ans->ipaddr[0]) >> 8,</span> 327*10465441SEvalZero<a name="l00307"></a>00307 <span class="comment"> htons(ans->ipaddr[0]) & 0xff,</span> 328*10465441SEvalZero<a name="l00308"></a>00308 <span class="comment"> htons(ans->ipaddr[1]) >> 8,</span> 329*10465441SEvalZero<a name="l00309"></a>00309 <span class="comment"> htons(ans->ipaddr[1]) & 0xff);*/</span> 330*10465441SEvalZero<a name="l00310"></a>00310 <span class="comment">/* XXX: we should really check that this IP address is the one</span> 331*10465441SEvalZero<a name="l00311"></a>00311 <span class="comment"> we want. */</span> 332*10465441SEvalZero<a name="l00312"></a>00312 namemapptr->ipaddr[0] = ans->ipaddr[0]; 333*10465441SEvalZero<a name="l00313"></a>00313 namemapptr->ipaddr[1] = ans->ipaddr[1]; 334*10465441SEvalZero<a name="l00314"></a>00314 335*10465441SEvalZero<a name="l00315"></a>00315 <a class="code" href="a00160.html#g6d9751d534453425c7a5a215d1d4414c">resolv_found</a>(namemapptr->name, namemapptr->ipaddr); 336*10465441SEvalZero<a name="l00316"></a>00316 <span class="keywordflow">return</span>; 337*10465441SEvalZero<a name="l00317"></a>00317 } <span class="keywordflow">else</span> { 338*10465441SEvalZero<a name="l00318"></a>00318 nameptr = nameptr + 10 + <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(ans->len); 339*10465441SEvalZero<a name="l00319"></a>00319 } 340*10465441SEvalZero<a name="l00320"></a>00320 --nanswers; 341*10465441SEvalZero<a name="l00321"></a>00321 } 342*10465441SEvalZero<a name="l00322"></a>00322 } 343*10465441SEvalZero<a name="l00323"></a>00323 344*10465441SEvalZero<a name="l00324"></a>00324 } 345*10465441SEvalZero<a name="l00325"></a>00325 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span> 346*10465441SEvalZero<a name="l00326"></a>00326 <span class="comment">/** \internal</span> 347*10465441SEvalZero<a name="l00327"></a>00327 <span class="comment"> * The main UDP function.</span> 348*10465441SEvalZero<a name="l00328"></a>00328 <span class="comment"> */</span> 349*10465441SEvalZero<a name="l00329"></a>00329 <span class="comment">/*---------------------------------------------------------------------------*/</span> 350*10465441SEvalZero<a name="l00330"></a>00330 <span class="keywordtype">void</span> 351*10465441SEvalZero<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>) 352*10465441SEvalZero<a name="l00332"></a>00332 { 353*10465441SEvalZero<a name="l00333"></a>00333 <span class="keywordflow">if</span>(<a class="code" href="a00095.html">uip_udp_conn</a>->rport == <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(53)) { 354*10465441SEvalZero<a name="l00334"></a>00334 <span class="keywordflow">if</span>(<a class="code" href="a00147.html#g58bb90796c1cdad3aac2ecf44d87b20e">uip_poll</a>()) { 355*10465441SEvalZero<a name="l00335"></a>00335 check_entries(); 356*10465441SEvalZero<a name="l00336"></a>00336 } 357*10465441SEvalZero<a name="l00337"></a>00337 <span class="keywordflow">if</span>(<a class="code" href="a00147.html#g26a14b8dae3f861830af9e7cf1e03725">uip_newdata</a>()) { 358*10465441SEvalZero<a name="l00338"></a>00338 newdata(); 359*10465441SEvalZero<a name="l00339"></a>00339 } 360*10465441SEvalZero<a name="l00340"></a>00340 } 361*10465441SEvalZero<a name="l00341"></a>00341 } 362*10465441SEvalZero<a name="l00342"></a>00342 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span> 363*10465441SEvalZero<a name="l00343"></a>00343 <span class="comment">/**</span> 364*10465441SEvalZero<a name="l00344"></a>00344 <span class="comment"> * Queues a name so that a question for the name will be sent out.</span> 365*10465441SEvalZero<a name="l00345"></a>00345 <span class="comment"> *</span> 366*10465441SEvalZero<a name="l00346"></a>00346 <span class="comment"> * \param name The hostname that is to be queried.</span> 367*10465441SEvalZero<a name="l00347"></a>00347 <span class="comment"> */</span> 368*10465441SEvalZero<a name="l00348"></a>00348 <span class="comment">/*---------------------------------------------------------------------------*/</span> 369*10465441SEvalZero<a name="l00349"></a>00349 <span class="keywordtype">void</span> 370*10465441SEvalZero<a name="l00350"></a><a class="code" href="a00160.html#ge4dcbbe6c641d2e3b8537b479df5fc99">00350</a> <a class="code" href="a00160.html#ge4dcbbe6c641d2e3b8537b479df5fc99">resolv_query</a>(<span class="keywordtype">char</span> *name) 371*10465441SEvalZero<a name="l00351"></a>00351 { 372*10465441SEvalZero<a name="l00352"></a>00352 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> i; 373*10465441SEvalZero<a name="l00353"></a>00353 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> lseq, lseqi; 374*10465441SEvalZero<a name="l00354"></a>00354 <span class="keyword">register</span> <span class="keyword">struct </span>namemap *nameptr; 375*10465441SEvalZero<a name="l00355"></a>00355 376*10465441SEvalZero<a name="l00356"></a>00356 lseq = lseqi = 0; 377*10465441SEvalZero<a name="l00357"></a>00357 378*10465441SEvalZero<a name="l00358"></a>00358 <span class="keywordflow">for</span>(i = 0; i < <a class="code" href="a00160.html#g221d37ccde7e3fd0dd2c2eb0a6b15493">RESOLV_ENTRIES</a>; ++i) { 379*10465441SEvalZero<a name="l00359"></a>00359 nameptr = &names[i]; 380*10465441SEvalZero<a name="l00360"></a>00360 <span class="keywordflow">if</span>(nameptr->state == <a class="code" href="a00102.html#ee60b8757bacab269b0ccd7c240bf01d">STATE_UNUSED</a>) { 381*10465441SEvalZero<a name="l00361"></a>00361 <span class="keywordflow">break</span>; 382*10465441SEvalZero<a name="l00362"></a>00362 } 383*10465441SEvalZero<a name="l00363"></a>00363 <span class="keywordflow">if</span>(seqno - nameptr->seqno > lseq) { 384*10465441SEvalZero<a name="l00364"></a>00364 lseq = seqno - nameptr->seqno; 385*10465441SEvalZero<a name="l00365"></a>00365 lseqi = i; 386*10465441SEvalZero<a name="l00366"></a>00366 } 387*10465441SEvalZero<a name="l00367"></a>00367 } 388*10465441SEvalZero<a name="l00368"></a>00368 389*10465441SEvalZero<a name="l00369"></a>00369 <span class="keywordflow">if</span>(i == <a class="code" href="a00160.html#g221d37ccde7e3fd0dd2c2eb0a6b15493">RESOLV_ENTRIES</a>) { 390*10465441SEvalZero<a name="l00370"></a>00370 i = lseqi; 391*10465441SEvalZero<a name="l00371"></a>00371 nameptr = &names[i]; 392*10465441SEvalZero<a name="l00372"></a>00372 } 393*10465441SEvalZero<a name="l00373"></a>00373 394*10465441SEvalZero<a name="l00374"></a>00374 <span class="comment">/* printf("Using entry %d\n", i);*/</span> 395*10465441SEvalZero<a name="l00375"></a>00375 396*10465441SEvalZero<a name="l00376"></a>00376 strcpy(nameptr->name, name); 397*10465441SEvalZero<a name="l00377"></a>00377 nameptr->state = <a class="code" href="a00102.html#bf4401501f1389872141a78b63f325a3">STATE_NEW</a>; 398*10465441SEvalZero<a name="l00378"></a>00378 nameptr->seqno = seqno; 399*10465441SEvalZero<a name="l00379"></a>00379 ++seqno; 400*10465441SEvalZero<a name="l00380"></a>00380 } 401*10465441SEvalZero<a name="l00381"></a>00381 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span> 402*10465441SEvalZero<a name="l00382"></a>00382 <span class="comment">/**</span> 403*10465441SEvalZero<a name="l00383"></a>00383 <span class="comment"> * Look up a hostname in the array of known hostnames.</span> 404*10465441SEvalZero<a name="l00384"></a>00384 <span class="comment"> *</span> 405*10465441SEvalZero<a name="l00385"></a>00385 <span class="comment"> * \note This function only looks in the internal array of known</span> 406*10465441SEvalZero<a name="l00386"></a>00386 <span class="comment"> * hostnames, it does not send out a query for the hostname if none</span> 407*10465441SEvalZero<a name="l00387"></a>00387 <span class="comment"> * was found. The function resolv_query() can be used to send a query</span> 408*10465441SEvalZero<a name="l00388"></a>00388 <span class="comment"> * for a hostname.</span> 409*10465441SEvalZero<a name="l00389"></a>00389 <span class="comment"> *</span> 410*10465441SEvalZero<a name="l00390"></a>00390 <span class="comment"> * \return A pointer to a 4-byte representation of the hostname's IP</span> 411*10465441SEvalZero<a name="l00391"></a>00391 <span class="comment"> * address, or NULL if the hostname was not found in the array of</span> 412*10465441SEvalZero<a name="l00392"></a>00392 <span class="comment"> * hostnames.</span> 413*10465441SEvalZero<a name="l00393"></a>00393 <span class="comment"> */</span> 414*10465441SEvalZero<a name="l00394"></a>00394 <span class="comment">/*---------------------------------------------------------------------------*/</span> 415*10465441SEvalZero<a name="l00395"></a>00395 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> * 416*10465441SEvalZero<a name="l00396"></a><a class="code" href="a00160.html#g66d19181ad5fe8b8f7c84d1f1d46a2ec">00396</a> <a class="code" href="a00160.html#g66d19181ad5fe8b8f7c84d1f1d46a2ec">resolv_lookup</a>(<span class="keywordtype">char</span> *name) 417*10465441SEvalZero<a name="l00397"></a>00397 { 418*10465441SEvalZero<a name="l00398"></a>00398 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> i; 419*10465441SEvalZero<a name="l00399"></a>00399 <span class="keyword">struct </span>namemap *nameptr; 420*10465441SEvalZero<a name="l00400"></a>00400 421*10465441SEvalZero<a name="l00401"></a>00401 <span class="comment">/* Walk through the list to see if the name is in there. If it is</span> 422*10465441SEvalZero<a name="l00402"></a>00402 <span class="comment"> not, we return NULL. */</span> 423*10465441SEvalZero<a name="l00403"></a>00403 <span class="keywordflow">for</span>(i = 0; i < <a class="code" href="a00160.html#g221d37ccde7e3fd0dd2c2eb0a6b15493">RESOLV_ENTRIES</a>; ++i) { 424*10465441SEvalZero<a name="l00404"></a>00404 nameptr = &names[i]; 425*10465441SEvalZero<a name="l00405"></a>00405 <span class="keywordflow">if</span>(nameptr->state == <a class="code" href="a00102.html#876c82c946543cd70c141e41417138e0">STATE_DONE</a> && 426*10465441SEvalZero<a name="l00406"></a>00406 strcmp(name, nameptr->name) == 0) { 427*10465441SEvalZero<a name="l00407"></a>00407 <span class="keywordflow">return</span> nameptr->ipaddr; 428*10465441SEvalZero<a name="l00408"></a>00408 } 429*10465441SEvalZero<a name="l00409"></a>00409 } 430*10465441SEvalZero<a name="l00410"></a>00410 <span class="keywordflow">return</span> <a class="code" href="a00160.html#g070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>; 431*10465441SEvalZero<a name="l00411"></a>00411 } 432*10465441SEvalZero<a name="l00412"></a>00412 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span> 433*10465441SEvalZero<a name="l00413"></a>00413 <span class="comment">/**</span> 434*10465441SEvalZero<a name="l00414"></a>00414 <span class="comment"> * Obtain the currently configured DNS server.</span> 435*10465441SEvalZero<a name="l00415"></a>00415 <span class="comment"> *</span> 436*10465441SEvalZero<a name="l00416"></a>00416 <span class="comment"> * \return A pointer to a 4-byte representation of the IP address of</span> 437*10465441SEvalZero<a name="l00417"></a>00417 <span class="comment"> * the currently configured DNS server or NULL if no DNS server has</span> 438*10465441SEvalZero<a name="l00418"></a>00418 <span class="comment"> * been configured.</span> 439*10465441SEvalZero<a name="l00419"></a>00419 <span class="comment"> */</span> 440*10465441SEvalZero<a name="l00420"></a>00420 <span class="comment">/*---------------------------------------------------------------------------*/</span> 441*10465441SEvalZero<a name="l00421"></a>00421 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> * 442*10465441SEvalZero<a name="l00422"></a><a class="code" href="a00160.html#g3191066cf8f76bd00b6843b77c37068f">00422</a> <a class="code" href="a00160.html#g3191066cf8f76bd00b6843b77c37068f">resolv_getserver</a>(<span class="keywordtype">void</span>) 443*10465441SEvalZero<a name="l00423"></a>00423 { 444*10465441SEvalZero<a name="l00424"></a>00424 <span class="keywordflow">if</span>(resolv_conn == <a class="code" href="a00160.html#g070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) { 445*10465441SEvalZero<a name="l00425"></a>00425 <span class="keywordflow">return</span> <a class="code" href="a00160.html#g070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>; 446*10465441SEvalZero<a name="l00426"></a>00426 } 447*10465441SEvalZero<a name="l00427"></a>00427 <span class="keywordflow">return</span> resolv_conn-><a class="code" href="a00095.html#8a661a2d544100b82d0d14a1985083d5">ripaddr</a>; 448*10465441SEvalZero<a name="l00428"></a>00428 } 449*10465441SEvalZero<a name="l00429"></a>00429 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span> 450*10465441SEvalZero<a name="l00430"></a>00430 <span class="comment">/**</span> 451*10465441SEvalZero<a name="l00431"></a>00431 <span class="comment"> * Configure which DNS server to use for queries.</span> 452*10465441SEvalZero<a name="l00432"></a>00432 <span class="comment"> *</span> 453*10465441SEvalZero<a name="l00433"></a>00433 <span class="comment"> * \param dnsserver A pointer to a 4-byte representation of the IP</span> 454*10465441SEvalZero<a name="l00434"></a>00434 <span class="comment"> * address of the DNS server to be configured.</span> 455*10465441SEvalZero<a name="l00435"></a>00435 <span class="comment"> */</span> 456*10465441SEvalZero<a name="l00436"></a>00436 <span class="comment">/*---------------------------------------------------------------------------*/</span> 457*10465441SEvalZero<a name="l00437"></a>00437 <span class="keywordtype">void</span> 458*10465441SEvalZero<a name="l00438"></a><a class="code" href="a00160.html#gdf916e0c752f5cda70d0bddb2be422ba">00438</a> <a class="code" href="a00160.html#gdf916e0c752f5cda70d0bddb2be422ba">resolv_conf</a>(<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> *dnsserver) 459*10465441SEvalZero<a name="l00439"></a>00439 { 460*10465441SEvalZero<a name="l00440"></a>00440 <span class="keywordflow">if</span>(resolv_conn != <a class="code" href="a00160.html#g070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) { 461*10465441SEvalZero<a name="l00441"></a>00441 <a class="code" href="a00147.html#gf2dbaceb10c67783a115075b5b6d66df">uip_udp_remove</a>(resolv_conn); 462*10465441SEvalZero<a name="l00442"></a>00442 } 463*10465441SEvalZero<a name="l00443"></a>00443 464*10465441SEvalZero<a name="l00444"></a>00444 resolv_conn = <a class="code" href="a00147.html#g79c4110211247df3fb30b8cf1c4c02af">uip_udp_new</a>(dnsserver, <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(53)); 465*10465441SEvalZero<a name="l00445"></a>00445 } 466*10465441SEvalZero<a name="l00446"></a>00446 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span> 467*10465441SEvalZero<a name="l00447"></a>00447 <span class="comment">/**</span> 468*10465441SEvalZero<a name="l00448"></a>00448 <span class="comment"> * Initalize the resolver.</span> 469*10465441SEvalZero<a name="l00449"></a>00449 <span class="comment"> */</span> 470*10465441SEvalZero<a name="l00450"></a>00450 <span class="comment">/*---------------------------------------------------------------------------*/</span> 471*10465441SEvalZero<a name="l00451"></a>00451 <span class="keywordtype">void</span> 472*10465441SEvalZero<a name="l00452"></a><a class="code" href="a00160.html#gb50f78bbf36d912d69f6c1685d0b40e3">00452</a> <a class="code" href="a00160.html#gb50f78bbf36d912d69f6c1685d0b40e3">resolv_init</a>(<span class="keywordtype">void</span>) 473*10465441SEvalZero<a name="l00453"></a>00453 { 474*10465441SEvalZero<a name="l00454"></a>00454 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> i; 475*10465441SEvalZero<a name="l00455"></a>00455 476*10465441SEvalZero<a name="l00456"></a>00456 <span class="keywordflow">for</span>(i = 0; i < <a class="code" href="a00160.html#g221d37ccde7e3fd0dd2c2eb0a6b15493">RESOLV_ENTRIES</a>; ++i) { 477*10465441SEvalZero<a name="l00457"></a>00457 names[i].state = <a class="code" href="a00102.html#876c82c946543cd70c141e41417138e0">STATE_DONE</a>; 478*10465441SEvalZero<a name="l00458"></a>00458 } 479*10465441SEvalZero<a name="l00459"></a>00459 480*10465441SEvalZero<a name="l00460"></a>00460 } 481*10465441SEvalZero<a name="l00461"></a>00461 <span class="comment">/*---------------------------------------------------------------------------*/</span> 482*10465441SEvalZero<a name="l00462"></a>00462 <span class="comment"></span> 483*10465441SEvalZero<a name="l00463"></a>00463 <span class="comment">/** @} */</span><span class="comment"></span> 484*10465441SEvalZero<a name="l00464"></a>00464 <span class="comment">/** @} */</span> 485*10465441SEvalZero</pre></div><hr size="1"><address style="align: right;"><small>Generated on Mon Jun 12 10:23:01 2006 for uIP 1.0 by 486*10465441SEvalZero<a href="http://www.doxygen.org/index.html"> 487*10465441SEvalZero<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address> 488*10465441SEvalZero</body> 489*10465441SEvalZero</html> 490
