dhcpc_8c-source.html

Freescale mcu OpenTCP-1.0.4.doc.html.zip 文档

00671                                                                 <span class="keywordflow">break</span>;
00672                                                 }
00673                                         }
00674                                         <span class="comment">/* ok, processed all, got what we were looking for ? */</span>
00675                                         <span class="keywordflow">if</span>((!<a class="code" href="dhcpc_8c.html#a6">dhcpc_server_identifier</a>)||(msg_type!=DHCP_OFFER)){
00676                                                 DEBUGOUT(<span class="stringliteral">" Not a DHCP offer or no server identifier; Aborting...\r\n"</span>);
00677                                                 <span class="keywordflow">return</span>(-1);
00678                                         }
00679                                         
00680                                         DEBUGOUT(<span class="stringliteral">" DHCP offer valid, sending DHCP REQUEST; State SELECTING--&gt;REQUESTING\r\n"</span>);
00681                                         <span class="comment">/* we have the offer, contact the server! */</span>
00682                                         <a class="code" href="dhcpc_8c.html#a0">dhcpc_state</a>=DHCP_STATE_REQUESTING;
00683                                         <a class="code" href="dhcpc_8c.html#a7">dhcpc_requested_ip</a>=yiaddr;      <span class="comment">/* offered IP ! */</span>
00684                                         
00685                                         <a class="code" href="dhcpc_8c.html#a9">dhcpc_send_message</a>(DHCP_REQUEST);
00686                                         
00687                                         <a class="code" href="dhcpc_8c.html#a4">dhcpc_t1</a>=4;     <span class="comment">/* 4 secs for first retransmission */</span>
00688                                         <a class="code" href="dhcpc_8c.html#a5">dhcpc_t2</a>=8;     <span class="comment">/* next one after 8 secs */</span>
00689                                         <span class="keywordflow">break</span>;
00690 
00691                                 <span class="keywordflow">case</span> DHCP_STATE_REQUESTING:
00692                                         <span class="comment">/* wait for DHCPACK */</span>
00693                                         
00694                                         DEBUGOUT(<span class="stringliteral">"DHCP Client state=REQUESTING; "</span>);
00695 
00696                                         <span class="comment">/* is message from the same server who sent the offer </span>
00697 <span class="comment">                                         * and assigned IP == offered IP? This will also reject</span>
00698 <span class="comment">                                         * subsequent DHCPOFFERs from slow DHCP servers.</span>
00699 <span class="comment">                                         */</span>
00700                                         <span class="keywordflow">if</span>((<a class="code" href="dhcpc_8c.html#a6">dhcpc_server_identifier</a>!=ipaddr)||(yiaddr!=<a class="code" href="dhcpc_8c.html#a7">dhcpc_requested_ip</a>)){
00701                                                 DEBUGOUT(<span class="stringliteral">"Server or requested IP not the same, dumping..\r\n"</span>);
00702                                                 <span class="keywordflow">return</span> (-1);
00703                                         }
00704                                         
00705                                         <span class="comment">/* ok, go through param list and process them. We expect to get</span>
00706 <span class="comment">                                         * all the params here and that this is DHCPACK message</span>
00707 <span class="comment">                                         */</span>
00708                                         DEBUGOUT(<span class="stringliteral">"Received params: "</span>);
00709                                         <span class="keywordflow">while</span>((i=<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>())!=DHCP_OPT_END){
00710                                                 
00711                                                 <span class="keywordflow">switch</span>(i){
00712                                                         <span class="keywordflow">case</span> DHCP_OPT_PAD:
00713                                                                 <span class="keywordflow">break</span>;
00714                                                         <span class="keywordflow">case</span> DHCP_OPT_SUBNET_MASK:
00715                                                                 temp=<a class="code" href="dhcpc_8c.html#a12">dhcpc_read_n_bytes</a>(<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>());
00716                                                                 <span class="comment">/* temp holds subnet mask, for now just show it and set params*/</span>
00717                                                                 localmachine.netmask=temp;
00718                                                                 DEBUGOUT(<span class="stringliteral">"Subnet mask;"</span>);
00719                                                                 <span class="keywordflow">break</span>;
00720                                                         <span class="keywordflow">case</span> DHCP_OPT_ROUTER:
00721                                                                 temp=<a class="code" href="dhcpc_8c.html#a12">dhcpc_read_n_bytes</a>(<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>());
00722                                                                 <span class="comment">/* temp holds gateway IP */</span>
00723                                                                 localmachine.defgw=temp;
00724                                                                 DEBUGOUT(<span class="stringliteral">"Gateway IP; "</span>);
00725                                                                 <span class="keywordflow">break</span>;
00726                                                         <span class="keywordflow">case</span> DHCP_OPT_DNS_SERVER:
00727                                                                 temp=<a class="code" href="dhcpc_8c.html#a12">dhcpc_read_n_bytes</a>(<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>());
00728                                                                 DEBUGOUT(<span class="stringliteral">"DNS IP;"</span>);
00729                                                                 <span class="keywordflow">break</span>;
00730                                                         <span class="keywordflow">case</span> DHCP_OPT_HOST_NAME:
00731                                                                 <span class="comment">/* Read host name here and store it */</span>
00732                                                                 i=<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();  <span class="comment">/* length of host name */</span>
00733                                                                 <span class="keywordflow">while</span>(i--){
00734                                                                         <span class="comment">/* read host name. Store this if necessary */</span>
00735                                                                         <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();
00736                                                                 }
00737                                                                 DEBUGOUT(<span class="stringliteral">"Host name; "</span>);
00738                                                                 <span class="keywordflow">break</span>;
00739                                                         <span class="keywordflow">case</span> DHCP_OPT_LEASE_TIME:
00740                                                                 temp=<a class="code" href="dhcpc_8c.html#a12">dhcpc_read_n_bytes</a>(<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>());
00741                                                                 <span class="comment">/* time calculation from RFC! These values can also</span>
00742 <span class="comment">                                                                 * be received directly in options</span>
00743 <span class="comment">                                                                 */</span>
00744                                                                 <a class="code" href="dhcpc_8c.html#a4">dhcpc_t1</a>=0.5*temp;
00745                                                                 <a class="code" href="dhcpc_8c.html#a5">dhcpc_t2</a>=0.875*temp;
00746                                                                 DEBUGOUT(<span class="stringliteral">"Lease time;"</span>); 
00747                                                                 <span class="keywordflow">break</span>;
00748                                                         <span class="keywordflow">case</span> DHCP_OPT_OVERLOAD:
00749                                                                 DEBUGOUT(<span class="stringliteral">"Overloaded DHCP message, can't process...\r\n"</span>);
00750                                                                 <span class="keywordflow">return</span> (-1);
00751                                                                 <span class="keywordflow">break</span>;
00752                                                         <span class="keywordflow">case</span> DHCP_OPT_MSG_TYPE:
00753                                                                 <span class="comment">/* if this is DHCPACK we can switch state and assume</span>
00754 <span class="comment">                                                                 * that the parameters are OK</span>
00755 <span class="comment">                                                                 */</span>
00756                                                                 <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();
00757                                                                 <span class="keywordflow">if</span>(<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>()==DHCP_ACK){
00758                                                                         DEBUGOUT(<span class="stringliteral">"DHCP_ACK Message!; State REQUESTING--&gt;BOUND; "</span>);
00759                                                                         <a class="code" href="dhcpc_8c.html#a0">dhcpc_state</a>=DHCP_STATE_BOUND;
00760                                                                         
00761                                                                         <span class="comment">/* we should actually probe the received IP with</span>
00762 <span class="comment">                                                                         * ARP first, but let's wait with that for </span>
00763 <span class="comment">                                                                         * now.....</span>
00764 <span class="comment">                                                                         */</span>
00765                                                                         localmachine.localip=<a class="code" href="dhcpc_8c.html#a7">dhcpc_requested_ip</a>;
00766                                                                         <span class="comment">/* dhcpc_requested_ip holds the assigned IP</span>
00767 <span class="comment">                                                                         * address. USE IT OR LOOSE IT!</span>
00768 <span class="comment">                                                                         */</span>
00769                                                                         DEBUGOUT(<span class="stringliteral">"IP address;"</span>);
00770                                                                 }<span class="keywordflow">else</span>{
00771                                                                         DEBUGOUT(<span class="stringliteral">"NOT DHCPACK message; dumping...\r\n"</span>);
00772                                                                         <span class="keywordflow">return</span>(-1);
00773                                                                 }       
00774                                                                 <span class="keywordflow">break</span>;
00775                                                         <span class="keywordflow">case</span> DHCP_OPT_T1_VALUE:
00776                                                                 DEBUGOUT(<span class="stringliteral">"T1;"</span>);
00777                                                                 <a class="code" href="dhcpc_8c.html#a4">dhcpc_t1</a>=<a class="code" href="dhcpc_8c.html#a12">dhcpc_read_n_bytes</a>(<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>());
00778                                                                 <span class="keywordflow">break</span>;
00779                                                         <span class="keywordflow">case</span> DHCP_OPT_T2_VALUE:
00780                                                                 DEBUGOUT(<span class="stringliteral">"T2; "</span>);
00781                                                                 <a class="code" href="dhcpc_8c.html#a5">dhcpc_t2</a>=<a class="code" href="dhcpc_8c.html#a12">dhcpc_read_n_bytes</a>(<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>());
00782                                                                 <span class="keywordflow">break</span>;
00783                                                         <span class="keywordflow">default</span>:
00784                                                                 <a class="code" href="dhcpc_8c.html#a12">dhcpc_read_n_bytes</a>(<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>());
00785                                                                 <span class="keywordflow">break</span>;
00786                                                 }
00787                                         }
00788                                         DEBUGOUT(<span class="stringliteral">"\r\n"</span>);
00789                                         <span class="keywordflow">break</span>;
00790                                 <span class="keywordflow">case</span> DHCP_STATE_RENEWING:
00791                                 <span class="keywordflow">case</span> DHCP_STATE_REBINDING:
00792                                 <span class="keywordflow">case</span> DHCP_STATE_REBOOTING:
00793                                         <span class="comment">/* wait for DHCPACK. If we get DHCPNAK restart. Here</span>
00794 <span class="comment">                                         * we're only interested in ACK and T1 and T2 parameters.</span>
00795 <span class="comment">                                         * NOTE: other parameters can change as well during time(</span>
00796 <span class="comment">                                         * DNS, gateway etc. Add cases similar to those in</span>
00797 <span class="comment">                                         * REQUESTING state here as well if you want those.</span>
00798 <span class="comment">                                         */</span>
00799                                         DEBUGOUT(<span class="stringliteral">"DHCP Client state=REQUESTING or REBINDING; "</span>);
00800                                         <span class="keywordflow">while</span>((i=<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>())!=DHCP_OPT_END){
00801                                                 <span class="keywordflow">switch</span>(i){
00802                                                         <span class="keywordflow">case</span> DHCP_OPT_PAD:
00803                                                                 <span class="keywordflow">break</span>;
00804                                                         <span class="keywordflow">case</span> DHCP_OPT_LEASE_TIME:
00805                                                                 DEBUGOUT(<span class="stringliteral">"Lease time; "</span>);
00806                                                                 temp=<a class="code" href="dhcpc_8c.html#a12">dhcpc_read_n_bytes</a>(<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>());
00807