dhcpc_8c-source.html

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

00358 <span class="comment">                                         * expired by now. Restart the process</span>
00359 <span class="comment">                                         */</span>
00360                                          <a class="code" href="dhcpc_8c.html#a0">dhcpc_state</a>=DHCP_STATE_INIT;
00361                                          localmachine.localip=0;        <span class="comment">/* can't use this any more */</span>
00362                                 }<span class="keywordflow">else</span>{
00363                                         DEBUGOUT(<span class="stringliteral">"DHCP State=REBINDING; Retransmitting DHCPREQUEST\r\n"</span>);
00364                                         <span class="comment">/* still have some time */</span>
00365                                         <a class="code" href="dhcpc_8c.html#a9">dhcpc_send_message</a>(DHCP_REQUEST);
00366                                 }
00367                         }
00368                         <span class="keywordflow">break</span>;
00369                 <span class="keywordflow">default</span>:
00370                         <span class="keywordflow">break</span>;
00371         }
00372         
00373         <span class="keywordflow">if</span>(sec){
00374                 <a class="code" href="timers_8c.html#a6">init_timer</a>(<a class="code" href="dhcpc_8c.html#a1">dhcpc_timer_handle</a>,<a class="code" href="timers_8h.html#a1">TIMERTIC</a>*1);
00375         }
00376 }
00377 
<a name="l00389"></a><a class="code" href="dhcpc_8c.html#a9">00389</a> INT8 <a class="code" href="dhcpc_8c.html#a9">dhcpc_send_message</a>(UINT8 msg_type)
00390 {
00391 
00392         UINT16 index;
00393         UINT8 *buf_ptr; <span class="comment">/* transmit buffer pointer */</span>
00394         
00395         <span class="comment">/* first clear transmit buffer to all zeroes */</span>
00396         <span class="keywordflow">for</span>(index=<a class="code" href="tcp__ip_8h.html#a62">UDP_APP_OFFSET</a>;index&lt;<a class="code" href="group__opentcp__config.html#a4">NETWORK_TX_BUFFER_SIZE</a>;index++)
00397                 net_buf[index]=0;
00398                 
00399         buf_ptr=net_buf+<a class="code" href="tcp__ip_8h.html#a62">UDP_APP_OFFSET</a>;
00400         
00401         <span class="comment">/* create DHCP message */</span>
00402         
00403         *buf_ptr++=BOOT_REQUEST;
00404         *buf_ptr++=0x01;                <span class="comment">/* htype=ethernet */</span>
00405         *buf_ptr++=0x06;                <span class="comment">/* hlen=6 for ethernet */</span>
00406         *buf_ptr++=0x00;                <span class="comment">/* hops=0 by clients */</span>
00407         
00408         <span class="comment">/* xid, use constant value for all requests (allowed by RFC) */</span>
00409         *buf_ptr++=0xAA;
00410         *buf_ptr++=0xBB;
00411         *buf_ptr++=0xCC;
00412         *buf_ptr++=0xDD;
00413         
00414         <span class="comment">/* seconds from boot. Fixed for now */</span>
00415         *buf_ptr++=0x00;
00416         *buf_ptr++=0x00;
00417         
00418         <span class="comment">/* flags, use broadcast */</span>
00419         *buf_ptr++=0x80;
00420         *buf_ptr++=0x00;
00421         
00422         <span class="comment">/* ciaddr. Sent only if client is in BOUND, RENEW or REBINDING</span>
00423 <span class="comment">         * state (RFC2131)</span>
00424 <span class="comment">         */</span>
00425         <span class="keywordflow">if</span>((<a class="code" href="dhcpc_8c.html#a0">dhcpc_state</a>==DHCP_STATE_BOUND)
00426                 ||(<a class="code" href="dhcpc_8c.html#a0">dhcpc_state</a>==DHCP_STATE_RENEWING)
00427                 ||(<a class="code" href="dhcpc_8c.html#a0">dhcpc_state</a>==DHCP_STATE_REBINDING)){
00428                 *buf_ptr++=(UINT8)(localmachine.localip&gt;&gt;24);
00429                 *buf_ptr++=(UINT8)(localmachine.localip&gt;&gt;16);
00430                 *buf_ptr++=(UINT8)(localmachine.localip&gt;&gt;8);
00431                 *buf_ptr++=(UINT8)(localmachine.localip);               
00432         }<span class="keywordflow">else</span>{
00433                 buf_ptr+=4;     <span class="comment">/* skip 4 bytes, buffer zeroed already */</span>
00434         }
00435         
00436         <span class="comment">/* yiaddr, siaddr, giaddr, skip */</span>
00437         buf_ptr+=12;
00438         
00439         <span class="comment">/* chaddr */</span>
00440         *buf_ptr++=localmachine.localHW[5];
00441         *buf_ptr++=localmachine.localHW[4];
00442         *buf_ptr++=localmachine.localHW[3];
00443         *buf_ptr++=localmachine.localHW[2];
00444         *buf_ptr++=localmachine.localHW[1];
00445         *buf_ptr++=localmachine.localHW[0];
00446         buf_ptr+=10;
00447         
00448         <span class="comment">/* sname and file, skip */</span>
00449         buf_ptr+=192;
00450         
00451         <span class="comment">/* options field. First magic cookie */</span>
00452         *buf_ptr++=99;
00453         *buf_ptr++=130;
00454         *buf_ptr++=83;
00455         *buf_ptr++=99;
00456 
00457         <span class="comment">/* message type */</span>
00458         *buf_ptr++=DHCP_OPT_MSG_TYPE;
00459         *buf_ptr++=1;
00460         *buf_ptr++=msg_type;
00461                 
00462         <span class="comment">/* next depends on what state we're in and message type */</span>
00463         <span class="keywordflow">switch</span>(msg_type){
00464 
00465                 <span class="keywordflow">case</span> DHCP_REQUEST:
00466                 <span class="keywordflow">case</span> DHCP_DECLINE: <span class="comment">/* sent only from REQUESTING state */</span>
00467 
00468                         <span class="comment">/* Requested IP address MUST NOT be sent in RENEWING and</span>
00469 <span class="comment">                         * REBINDING states (RFC2123 page 31)</span>
00470 <span class="comment">                         */</span>
00471                         <span class="keywordflow">if</span>((<a class="code" href="dhcpc_8c.html#a0">dhcpc_state</a>!=DHCP_STATE_RENEWING)
00472                                 &amp;&amp;(<a class="code" href="dhcpc_8c.html#a0">dhcpc_state</a>!=DHCP_STATE_REBINDING)){
00473                                 *buf_ptr++=DHCP_OPT_REQUESTED_IP;
00474                                 *buf_ptr++=4;
00475                                 *buf_ptr++=(UINT8)(<a class="code" href="dhcpc_8c.html#a7">dhcpc_requested_ip</a>&gt;&gt;24);
00476                                 *buf_ptr++=(UINT8)(<a class="code" href="dhcpc_8c.html#a7">dhcpc_requested_ip</a>&gt;&gt;16);
00477                                 *buf_ptr++=(UINT8)(<a class="code" href="dhcpc_8c.html#a7">dhcpc_requested_ip</a>&gt;&gt;8);
00478                                 *buf_ptr++=(UINT8)(dhcpc_requested_ip);
00479                         }       
00480                         <span class="comment">/* server identifier, only when not in INIT_REBOOT state </span>
00481 <span class="comment">                         *(RFC2131, Section 4.3.2) or RENEWING, REBINDING</span>
00482 <span class="comment">                         * state (RFC2131 page 31)</span>
00483 <span class="comment">                         */</span>
00484                         <span class="keywordflow">if</span>((<a class="code" href="dhcpc_8c.html#a0">dhcpc_state</a>!=DHCP_STATE_INIT_REBOOT)
00485                                 &amp;&amp;(<a class="code" href="dhcpc_8c.html#a0">dhcpc_state</a>!=DHCP_STATE_REBOOTING)   <span class="comment">/* for retransmissions */</span>                       
00486                                 &amp;&amp;(<a class="code" href="dhcpc_8c.html#a0">dhcpc_state</a>!=DHCP_STATE_RENEWING)
00487                                 &amp;&amp;(<a class="code" href="dhcpc_8c.html#a0">dhcpc_state</a>!=DHCP_STATE_REBINDING)){
00488                                 *buf_ptr++=DHCP_OPT_SERV_IDENT;
00489                                 *buf_ptr++=4;
00490                                 *buf_ptr++=(UINT8)(<a class="code" href="dhcpc_8c.html#a6">dhcpc_server_identifier</a>&gt;&gt;24);
00491                                 *buf_ptr++=(UINT8)(<a class="code" href="dhcpc_8c.html#a6">dhcpc_server_identifier</a>&gt;&gt;16);
00492                                 *buf_ptr++=(UINT8)(<a class="code" href="dhcpc_8c.html#a6">dhcpc_server_identifier</a>&gt;&gt;8);
00493                                 *buf_ptr++=(UINT8)(dhcpc_server_identifier);
00494                         }       
00495                         <span class="comment">/* go through to request parameters we're interested in, but</span>
00496 <span class="comment">                         * only if we're not sending DECLINE message (parameter list</span>
00497 <span class="comment">                         * MUST NOT be sent in such a message)</span>
00498 <span class="comment">                         */</span>
00499                          <span class="keywordflow">if</span>(msg_type==DHCP_DECLINE)
00500                                 <span class="keywordflow">break</span>;
00501                         
00502                 <span class="keywordflow">case</span> DHCP_DISCOVER:             
00503                         <span class="comment">/* parameter request list. These also MUST be transmitted</span>
00504 <span class="comment">                         * with DHCP REQUEST message */</span>
00505                         *buf_ptr++=DHCP_OPT_PARAM_REQUEST;
00506                         *buf_ptr++=7;   <span class="comment">/* number of parameters we're requesting */</span>
00507                         *buf_ptr++=DHCP_OPT_SUBNET_MASK;
00508                         *buf_ptr++=DHCP_OPT_ROUTER;