dhcp_8c-source.html

avr应用测试程序

00202 
<a name="l00203"></a><a class="code" href="group__dhcp.html#ga5">00203</a> <span class="keywordtype">void</span> <a class="code" href="group__dhcp.html#ga5">dhcpTimer</a>(<span class="keywordtype">void</span>)
00204 {
00205     <span class="comment">// this function to be called once per second</span>
00206 
00207     <span class="comment">// decrement lease time</span>
00208     <span class="keywordflow">if</span>(<a class="code" href="dhcp_8c.html#a2">DhcpLeaseTime</a>)
00209         <a class="code" href="dhcp_8c.html#a2">DhcpLeaseTime</a>--;
00210 }
00211 
<a name="l00212"></a><a class="code" href="group__dhcp.html#ga6">00212</a> uint8_t <a class="code" href="group__dhcp.html#ga6">dhcpGetOption</a>(uint8_t* <a class="code" href="structnetDhcpHeader.html#o2">options</a>, uint8_t optcode, uint8_t optlen, <span class="keywordtype">void</span>* optvalptr)
00213 {
00214     uint8_t i;
00215 
00216     <span class="comment">// parse for desired option</span>
00217     <span class="keywordflow">for</span> (;;)
00218     {
00219         <span class="comment">// skip pad characters</span>
00220         <span class="keywordflow">if</span>(*options == <a class="code" href="group__dhcp.html#ga17">DHCP_OPT_PAD</a>)
00221             options++;
00222         <span class="comment">// break if end reached</span>
00223         <span class="keywordflow">else</span> <span class="keywordflow">if</span>(*options == <a class="code" href="group__dhcp.html#ga32">DHCP_OPT_END</a>)
00224             <span class="keywordflow">break</span>;
00225         <span class="comment">// check for desired option</span>
00226         <span class="keywordflow">else</span> <span class="keywordflow">if</span>(*options == optcode)
00227         {
00228             <span class="comment">// found desired option</span>
00229             <span class="comment">// limit size to actual option length</span>
00230             optlen = MIN(optlen, *(options+1));
00231             <span class="comment">//if(*(options+1) &lt; optlen)</span>
00232             <span class="comment">//  optlen = *(options+1);</span>
00233             
00234             <span class="comment">// copy contents of option</span>
00235             <span class="keywordflow">for</span>(i=0; i&lt;optlen; i++)
00236                 *(((uint8_t*)optvalptr)+i) = *(options+i+2);
00237             <span class="comment">// return length of option</span>
00238             <span class="keywordflow">return</span> *(options+1);
00239         }
00240         <span class="keywordflow">else</span>
00241         {
00242             <span class="comment">// skip to next option</span>
00243             options++;
00244             options+=*options;
00245             options++;
00246         }
00247     }
00248     <span class="comment">// failed to find desired option</span>
00249     <span class="keywordflow">return</span> 0;
00250 }
00251 
00252 
<a name="l00253"></a><a class="code" href="group__dhcp.html#ga7">00253</a> uint8_t* <a class="code" href="group__dhcp.html#ga7">dhcpSetOption</a>(uint8_t* <a class="code" href="structnetDhcpHeader.html#o2">options</a>, uint8_t optcode, uint8_t optlen, <span class="keywordtype">void</span>* optvalptr)
00254 {
00255     <span class="comment">// use current options address as write point</span>
00256 
00257     <span class="comment">// set optcode</span>
00258     *options++ = optcode;
00259     <span class="comment">// set optlen</span>
00260     *options++ = optlen;
00261     <span class="comment">// copy in argument/data</span>
00262     <span class="keywordflow">while</span>(optlen--)
00263     {
00264         *options++ = *(uint8_t*)optvalptr++;
00265     }
00266     <span class="comment">// write end marker</span>
00267     *options = <a class="code" href="group__dhcp.html#ga32">DHCP_OPT_END</a>;
00268 
00269     <span class="comment">// return address of end marker, to be used as a future write point</span>
00270     <span class="keywordflow">return</span> options;
00271 }
00272 
00273 
00274 <span class="preprocessor">#ifdef DHCP_DEBUG_PRINT</span>
00275 <span class="preprocessor"></span><span class="keywordtype">void</span> <a class="code" href="group__dhcp.html#ga8">dhcpPrintHeader</a>(<span class="keyword">struct</span> <a class="code" href="structnetDhcpHeader.html">netDhcpHeader</a>* packet)
00276 {
00277     <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"DHCP Packet:\r\n"</span>);
00278     <span class="comment">// print op</span>
00279     <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"Op      : "</span>);
00280     <span class="keywordflow">switch</span>(packet-&gt;<a class="code" href="structnetDhcpHeader.html#o0">bootp</a>.<a class="code" href="structnetBootpHeader.html#o0">op</a>)
00281     {
00282     <span class="keywordflow">case</span> <a class="code" href="group__dhcp.html#ga10">BOOTP_OP_BOOTREQUEST</a>:  <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"BOOTREQUEST"</span>); <span class="keywordflow">break</span>;
00283     <span class="keywordflow">case</span> <a class="code" href="group__dhcp.html#ga11">BOOTP_OP_BOOTREPLY</a>:    <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"BOOTREPLY"</span>); <span class="keywordflow">break</span>;
00284     <span class="keywordflow">default</span>:                    <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"UNKNOWN"</span>); <span class="keywordflow">break</span>;
00285     }
00286     <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();
00287     <span class="comment">// print transaction ID</span>
00288     <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"XID     : 0x"</span>);    <a class="code" href="group__rprintf.html#ga9">rprintfu32</a>(packet-&gt;<a class="code" href="structnetDhcpHeader.html#o0">bootp</a>.<a class="code" href="structnetBootpHeader.html#o4">xid</a>);              <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();
00289     <span class="comment">// print client IP address</span>
00290     <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"ClIpAddr: "</span>);  <a class="code" href="group__net.html#ga6">netPrintIPAddr</a>(<a class="code" href="group__net.html#ga3">htonl</a>(packet-&gt;<a class="code" href="structnetDhcpHeader.html#o0">bootp</a>.<a class="code" href="structnetBootpHeader.html#o7">ciaddr</a>));    <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();
00291     <span class="comment">// print 'your' IP address</span>
00292     <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"YrIpAddr: "</span>);  <a class="code" href="group__net.html#ga6">netPrintIPAddr</a>(<a class="code" href="group__net.html#ga3">htonl</a>(packet-&gt;<a class="code" href="structnetDhcpHeader.html#o0">bootp</a>.<a class="code" href="structnetBootpHeader.html#o8">yiaddr</a>));    <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();
00293     <span class="comment">// print server IP address</span>
00294     <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"SvIpAddr: "</span>);  <a class="code" href="group__net.html#ga6">netPrintIPAddr</a>(<a class="code" href="group__net.html#ga3">htonl</a>(packet-&gt;<a class="code" href="structnetDhcpHeader.html#o0">bootp</a>.<a class="code" href="structnetBootpHeader.html#o9">siaddr</a>));    <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();
00295     <span class="comment">// print gateway IP address</span>
00296     <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"GwIpAddr: "</span>);  <a class="code" href="group__net.html#ga6">netPrintIPAddr</a>(<a class="code" href="group__net.html#ga3">htonl</a>(packet-&gt;<a class="code" href="structnetDhcpHeader.html#o0">bootp</a>.<a class="code" href="structnetBootpHeader.html#o10">giaddr</a>));    <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();
00297     <span class="comment">// print client hardware address</span>
00298     <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"ClHwAddr: "</span>);  <a class="code" href="group__net.html#ga5">netPrintEthAddr</a>((<span class="keyword">struct</span> netEthAddr*)packet-&gt;<a class="code" href="structnetDhcpHeader.html#o0">bootp</a>.<a class="code" href="structnetBootpHeader.html#o11">chaddr</a>);  <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();
00299 }
00300 <span class="preprocessor">#endif</span>
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