[136] | 1 | // DHCP Library v0.3 - April 25, 2009
|
---|
| 2 | // Author: Jordan Terrell - blog.jordanterrell.com
|
---|
| 3 |
|
---|
| 4 | #include "utility/w5500.h"
|
---|
| 5 |
|
---|
| 6 | #include <string.h>
|
---|
| 7 | #include <stdlib.h>
|
---|
| 8 | #include "Dhcp.h"
|
---|
| 9 | #include "Arduino.h"
|
---|
| 10 | #include "utility/util.h"
|
---|
| 11 |
|
---|
| 12 | int DhcpClass::beginWithDHCP(uint8_t *mac, unsigned long timeout, unsigned long responseTimeout)
|
---|
| 13 | {
|
---|
| 14 | _dhcpLeaseTime=0;
|
---|
| 15 | _dhcpT1=0;
|
---|
| 16 | _dhcpT2=0;
|
---|
| 17 | _lastCheck=0;
|
---|
| 18 | _timeout = timeout;
|
---|
| 19 | _responseTimeout = responseTimeout;
|
---|
| 20 |
|
---|
| 21 | // zero out _dhcpMacAddr
|
---|
| 22 | memset(_dhcpMacAddr, 0, 6);
|
---|
| 23 | reset_DHCP_lease();
|
---|
| 24 |
|
---|
| 25 | memcpy((void*)_dhcpMacAddr, (void*)mac, 6);
|
---|
| 26 | _dhcp_state = STATE_DHCP_START;
|
---|
| 27 | return request_DHCP_lease();
|
---|
| 28 | }
|
---|
| 29 |
|
---|
| 30 | void DhcpClass::reset_DHCP_lease(){
|
---|
| 31 | // zero out _dhcpSubnetMask, _dhcpGatewayIp, _dhcpLocalIp, _dhcpDhcpServerIp, _dhcpDnsServerIp
|
---|
| 32 | memset(_dhcpLocalIp, 0, 20);
|
---|
| 33 | }
|
---|
| 34 |
|
---|
| 35 | //return:0 on error, 1 if request is sent and response is received
|
---|
| 36 | int DhcpClass::request_DHCP_lease(){
|
---|
| 37 |
|
---|
| 38 | uint8_t messageType = 0;
|
---|
| 39 |
|
---|
| 40 |
|
---|
| 41 |
|
---|
| 42 | // Pick an initial transaction ID
|
---|
| 43 | _dhcpTransactionId = random(1UL, 2000UL);
|
---|
| 44 | _dhcpInitialTransactionId = _dhcpTransactionId;
|
---|
| 45 |
|
---|
| 46 | _dhcpUdpSocket.stop();
|
---|
| 47 | if (_dhcpUdpSocket.begin(DHCP_CLIENT_PORT) == 0)
|
---|
| 48 | {
|
---|
| 49 | // Couldn't get a socket
|
---|
| 50 | return 0;
|
---|
| 51 | }
|
---|
| 52 |
|
---|
| 53 | presend_DHCP();
|
---|
| 54 |
|
---|
| 55 | int result = 0;
|
---|
| 56 |
|
---|
| 57 | unsigned long startTime = millis();
|
---|
| 58 |
|
---|
| 59 | while(_dhcp_state != STATE_DHCP_LEASED)
|
---|
| 60 | {
|
---|
| 61 | if(_dhcp_state == STATE_DHCP_START)
|
---|
| 62 | {
|
---|
| 63 | //Serial.println("DHCP_START");
|
---|
| 64 | _dhcpTransactionId++;
|
---|
| 65 |
|
---|
| 66 | send_DHCP_MESSAGE(DHCP_DISCOVER, ((millis() - startTime) / 1000));
|
---|
| 67 | _dhcp_state = STATE_DHCP_DISCOVER;
|
---|
| 68 | }
|
---|
| 69 | else if(_dhcp_state == STATE_DHCP_REREQUEST){
|
---|
| 70 | _dhcpTransactionId++;
|
---|
| 71 | send_DHCP_MESSAGE(DHCP_REQUEST, ((millis() - startTime)/1000));
|
---|
| 72 | _dhcp_state = STATE_DHCP_REQUEST;
|
---|
| 73 | }
|
---|
| 74 | else if(_dhcp_state == STATE_DHCP_DISCOVER)
|
---|
| 75 | {
|
---|
| 76 | uint32_t respId;
|
---|
| 77 |
|
---|
| 78 | messageType = parseDHCPResponse(_responseTimeout, respId);
|
---|
| 79 | if(messageType == DHCP_OFFER)
|
---|
| 80 | {
|
---|
| 81 |
|
---|
| 82 | // We'll use the transaction ID that the offer came with,
|
---|
| 83 | // rather than the one we were up to
|
---|
| 84 | _dhcpTransactionId = respId;
|
---|
| 85 | send_DHCP_MESSAGE(DHCP_REQUEST, ((millis() - startTime) / 1000));
|
---|
| 86 | _dhcp_state = STATE_DHCP_REQUEST;
|
---|
| 87 | }
|
---|
| 88 | }
|
---|
| 89 | else if(_dhcp_state == STATE_DHCP_REQUEST)
|
---|
| 90 | {
|
---|
| 91 | uint32_t respId;
|
---|
| 92 | messageType = parseDHCPResponse(_responseTimeout, respId);
|
---|
| 93 | if(messageType == DHCP_ACK)
|
---|
| 94 | {
|
---|
| 95 | _dhcp_state = STATE_DHCP_LEASED;
|
---|
| 96 | result = 1;
|
---|
| 97 | //use default lease time if we didn't get it
|
---|
| 98 | if(_dhcpLeaseTime == 0){
|
---|
| 99 | _dhcpLeaseTime = DEFAULT_LEASE;
|
---|
| 100 | }
|
---|
| 101 | //calculate T1 & T2 if we didn't get it
|
---|
| 102 | if(_dhcpT1 == 0){
|
---|
| 103 | //T1 should be 50% of _dhcpLeaseTime
|
---|
| 104 | _dhcpT1 = _dhcpLeaseTime >> 1;
|
---|
| 105 | }
|
---|
| 106 | if(_dhcpT2 == 0){
|
---|
| 107 | //T2 should be 87.5% (7/8ths) of _dhcpLeaseTime
|
---|
| 108 | _dhcpT2 = _dhcpT1 << 1;
|
---|
| 109 | }
|
---|
| 110 | _renewInSec = _dhcpT1;
|
---|
| 111 | _rebindInSec = _dhcpT2;
|
---|
| 112 | }
|
---|
| 113 | else if(messageType == DHCP_NAK)
|
---|
| 114 | _dhcp_state = STATE_DHCP_START;
|
---|
| 115 | }
|
---|
| 116 |
|
---|
| 117 | if(messageType == 255)
|
---|
| 118 | {
|
---|
| 119 | messageType = 0;
|
---|
| 120 | _dhcp_state = STATE_DHCP_START;
|
---|
| 121 | }
|
---|
| 122 |
|
---|
| 123 | if(result != 1 && ((millis() - startTime) > _timeout))
|
---|
| 124 | break;
|
---|
| 125 | }
|
---|
| 126 |
|
---|
| 127 | // We're done with the socket now
|
---|
| 128 | _dhcpUdpSocket.stop();
|
---|
| 129 | _dhcpTransactionId++;
|
---|
| 130 |
|
---|
| 131 | return result;
|
---|
| 132 | }
|
---|
| 133 |
|
---|
| 134 | void DhcpClass::presend_DHCP()
|
---|
| 135 | {
|
---|
| 136 | }
|
---|
| 137 |
|
---|
| 138 | void DhcpClass::send_DHCP_MESSAGE(uint8_t messageType, uint16_t secondsElapsed)
|
---|
| 139 | {
|
---|
| 140 | uint8_t buffer[32];
|
---|
| 141 | memset(buffer, 0, 32);
|
---|
| 142 | IPAddress dest_addr( 255, 255, 255, 255 ); // Broadcast address
|
---|
| 143 |
|
---|
| 144 | if (-1 == _dhcpUdpSocket.beginPacket(dest_addr, DHCP_SERVER_PORT))
|
---|
| 145 | {
|
---|
| 146 | // FIXME Need to return errors
|
---|
| 147 | return;
|
---|
| 148 | }
|
---|
| 149 |
|
---|
| 150 | buffer[0] = DHCP_BOOTREQUEST; // op
|
---|
| 151 | buffer[1] = DHCP_HTYPE10MB; // htype
|
---|
| 152 | buffer[2] = DHCP_HLENETHERNET; // hlen
|
---|
| 153 | buffer[3] = DHCP_HOPS; // hops
|
---|
| 154 |
|
---|
| 155 | // xid
|
---|
| 156 | unsigned long xid = htonl(_dhcpTransactionId);
|
---|
| 157 | memcpy(buffer + 4, &(xid), 4);
|
---|
| 158 |
|
---|
| 159 | // 8, 9 - seconds elapsed
|
---|
| 160 | buffer[8] = ((secondsElapsed & 0xff00) >> 8);
|
---|
| 161 | buffer[9] = (secondsElapsed & 0x00ff);
|
---|
| 162 |
|
---|
| 163 | // flags
|
---|
| 164 | unsigned short flags = htons(DHCP_FLAGSBROADCAST);
|
---|
| 165 | memcpy(buffer + 10, &(flags), 2);
|
---|
| 166 |
|
---|
| 167 | // ciaddr: already zeroed
|
---|
| 168 | // yiaddr: already zeroed
|
---|
| 169 | // siaddr: already zeroed
|
---|
| 170 | // giaddr: already zeroed
|
---|
| 171 |
|
---|
| 172 | //put data in w5500 transmit buffer
|
---|
| 173 | _dhcpUdpSocket.write(buffer, 28);
|
---|
| 174 |
|
---|
| 175 | memset(buffer, 0, 32); // clear local buffer
|
---|
| 176 |
|
---|
| 177 | memcpy(buffer, _dhcpMacAddr, 6); // chaddr
|
---|
| 178 |
|
---|
| 179 | //put data in w5500 transmit buffer
|
---|
| 180 | _dhcpUdpSocket.write(buffer, 16);
|
---|
| 181 |
|
---|
| 182 | memset(buffer, 0, 32); // clear local buffer
|
---|
| 183 |
|
---|
| 184 | // leave zeroed out for sname && file
|
---|
| 185 | // put in w5500 transmit buffer x 6 (192 bytes)
|
---|
| 186 |
|
---|
| 187 | for(int i = 0; i < 6; i++) {
|
---|
| 188 | _dhcpUdpSocket.write(buffer, 32);
|
---|
| 189 | }
|
---|
| 190 |
|
---|
| 191 | // OPT - Magic Cookie
|
---|
| 192 | buffer[0] = (uint8_t)((MAGIC_COOKIE >> 24)& 0xFF);
|
---|
| 193 | buffer[1] = (uint8_t)((MAGIC_COOKIE >> 16)& 0xFF);
|
---|
| 194 | buffer[2] = (uint8_t)((MAGIC_COOKIE >> 8)& 0xFF);
|
---|
| 195 | buffer[3] = (uint8_t)(MAGIC_COOKIE& 0xFF);
|
---|
| 196 |
|
---|
| 197 | // OPT - message type
|
---|
| 198 | buffer[4] = dhcpMessageType;
|
---|
| 199 | buffer[5] = 0x01;
|
---|
| 200 | buffer[6] = messageType; //DHCP_REQUEST;
|
---|
| 201 |
|
---|
| 202 | // OPT - client identifier
|
---|
| 203 | buffer[7] = dhcpClientIdentifier;
|
---|
| 204 | buffer[8] = 0x07;
|
---|
| 205 | buffer[9] = 0x01;
|
---|
| 206 | memcpy(buffer + 10, _dhcpMacAddr, 6);
|
---|
| 207 |
|
---|
| 208 | // OPT - host name
|
---|
| 209 | buffer[16] = hostName;
|
---|
| 210 | buffer[17] = strlen(HOST_NAME) + 6; // length of hostname + last 3 bytes of mac address
|
---|
| 211 | strcpy((char*)&(buffer[18]), HOST_NAME);
|
---|
| 212 |
|
---|
| 213 | printByte((char*)&(buffer[24]), _dhcpMacAddr[3]);
|
---|
| 214 | printByte((char*)&(buffer[26]), _dhcpMacAddr[4]);
|
---|
| 215 | printByte((char*)&(buffer[28]), _dhcpMacAddr[5]);
|
---|
| 216 |
|
---|
| 217 | //put data in w5500 transmit buffer
|
---|
| 218 | _dhcpUdpSocket.write(buffer, 30);
|
---|
| 219 |
|
---|
| 220 | if(messageType == DHCP_REQUEST)
|
---|
| 221 | {
|
---|
| 222 | buffer[0] = dhcpRequestedIPaddr;
|
---|
| 223 | buffer[1] = 0x04;
|
---|
| 224 | buffer[2] = _dhcpLocalIp[0];
|
---|
| 225 | buffer[3] = _dhcpLocalIp[1];
|
---|
| 226 | buffer[4] = _dhcpLocalIp[2];
|
---|
| 227 | buffer[5] = _dhcpLocalIp[3];
|
---|
| 228 |
|
---|
| 229 | buffer[6] = dhcpServerIdentifier;
|
---|
| 230 | buffer[7] = 0x04;
|
---|
| 231 | buffer[8] = _dhcpDhcpServerIp[0];
|
---|
| 232 | buffer[9] = _dhcpDhcpServerIp[1];
|
---|
| 233 | buffer[10] = _dhcpDhcpServerIp[2];
|
---|
| 234 | buffer[11] = _dhcpDhcpServerIp[3];
|
---|
| 235 |
|
---|
| 236 | //put data in w5500 transmit buffer
|
---|
| 237 | _dhcpUdpSocket.write(buffer, 12);
|
---|
| 238 | }
|
---|
| 239 |
|
---|
| 240 | buffer[0] = dhcpParamRequest;
|
---|
| 241 | buffer[1] = 0x06;
|
---|
| 242 | buffer[2] = subnetMask;
|
---|
| 243 | buffer[3] = routersOnSubnet;
|
---|
| 244 | buffer[4] = dns;
|
---|
| 245 | buffer[5] = domainName;
|
---|
| 246 | buffer[6] = dhcpT1value;
|
---|
| 247 | buffer[7] = dhcpT2value;
|
---|
| 248 | buffer[8] = endOption;
|
---|
| 249 |
|
---|
| 250 | //put data in w5500 transmit buffer
|
---|
| 251 | _dhcpUdpSocket.write(buffer, 9);
|
---|
| 252 |
|
---|
| 253 | _dhcpUdpSocket.endPacket();
|
---|
| 254 | }
|
---|
| 255 |
|
---|
| 256 | uint8_t DhcpClass::parseDHCPResponse(unsigned long responseTimeout, uint32_t& transactionId)
|
---|
| 257 | {
|
---|
| 258 | uint8_t type = 0;
|
---|
| 259 | uint8_t opt_len = 0;
|
---|
| 260 |
|
---|
| 261 | unsigned long startTime = millis();
|
---|
| 262 |
|
---|
| 263 |
|
---|
| 264 |
|
---|
| 265 | while(_dhcpUdpSocket.parsePacket() <= 0)
|
---|
| 266 | {
|
---|
| 267 | if((millis() - startTime) > responseTimeout)
|
---|
| 268 | {
|
---|
| 269 |
|
---|
| 270 | return 255;
|
---|
| 271 | }
|
---|
| 272 | delay(50);
|
---|
| 273 | }
|
---|
| 274 |
|
---|
| 275 | // start reading in the packet
|
---|
| 276 | RIP_MSG_FIXED fixedMsg;
|
---|
| 277 | _dhcpUdpSocket.read((uint8_t*)&fixedMsg, sizeof(RIP_MSG_FIXED));
|
---|
| 278 |
|
---|
| 279 | if(fixedMsg.op == DHCP_BOOTREPLY && _dhcpUdpSocket.remotePort() == DHCP_SERVER_PORT)
|
---|
| 280 | {
|
---|
| 281 | transactionId = ntohl(fixedMsg.xid);
|
---|
| 282 | if(memcmp(fixedMsg.chaddr, _dhcpMacAddr, 6) != 0 || (transactionId < _dhcpInitialTransactionId) || (transactionId > _dhcpTransactionId))
|
---|
| 283 | {
|
---|
| 284 | // Need to read the rest of the packet here regardless
|
---|
| 285 | _dhcpUdpSocket.flush();
|
---|
| 286 | return 0;
|
---|
| 287 | }
|
---|
| 288 |
|
---|
| 289 | memcpy(_dhcpLocalIp, fixedMsg.yiaddr, 4);
|
---|
| 290 |
|
---|
| 291 | // Skip to the option part
|
---|
| 292 | // Doing this a byte at a time so we don't have to put a big buffer
|
---|
| 293 | // on the stack (as we don't have lots of memory lying around)
|
---|
| 294 | for (int i =0; i < (240 - (int)sizeof(RIP_MSG_FIXED)); i++)
|
---|
| 295 | {
|
---|
| 296 | _dhcpUdpSocket.read(); // we don't care about the returned byte
|
---|
| 297 | }
|
---|
| 298 |
|
---|
| 299 | while (_dhcpUdpSocket.available() > 0)
|
---|
| 300 | {
|
---|
| 301 | switch (_dhcpUdpSocket.read())
|
---|
| 302 | {
|
---|
| 303 | case endOption :
|
---|
| 304 |
|
---|
| 305 | break;
|
---|
| 306 |
|
---|
| 307 | case padOption :
|
---|
| 308 |
|
---|
| 309 | break;
|
---|
| 310 |
|
---|
| 311 | case dhcpMessageType :
|
---|
| 312 |
|
---|
| 313 | opt_len = _dhcpUdpSocket.read();
|
---|
| 314 | type = _dhcpUdpSocket.read();
|
---|
| 315 | break;
|
---|
| 316 |
|
---|
| 317 | case subnetMask :
|
---|
| 318 |
|
---|
| 319 | opt_len = _dhcpUdpSocket.read();
|
---|
| 320 | _dhcpUdpSocket.read(_dhcpSubnetMask, 4);
|
---|
| 321 | break;
|
---|
| 322 |
|
---|
| 323 | case routersOnSubnet :
|
---|
| 324 |
|
---|
| 325 | opt_len = _dhcpUdpSocket.read();
|
---|
| 326 | _dhcpUdpSocket.read(_dhcpGatewayIp, 4);
|
---|
| 327 | for (int i = 0; i < opt_len-4; i++)
|
---|
| 328 | {
|
---|
| 329 | _dhcpUdpSocket.read();
|
---|
| 330 | }
|
---|
| 331 | break;
|
---|
| 332 |
|
---|
| 333 | case dns :
|
---|
| 334 |
|
---|
| 335 | opt_len = _dhcpUdpSocket.read();
|
---|
| 336 | _dhcpUdpSocket.read(_dhcpDnsServerIp, 4);
|
---|
| 337 | for (int i = 0; i < opt_len-4; i++)
|
---|
| 338 | {
|
---|
| 339 | _dhcpUdpSocket.read();
|
---|
| 340 | }
|
---|
| 341 | break;
|
---|
| 342 |
|
---|
| 343 | case dhcpServerIdentifier :
|
---|
| 344 |
|
---|
| 345 | opt_len = _dhcpUdpSocket.read();
|
---|
| 346 | if(((_dhcpDhcpServerIp[0] == 0) && (_dhcpDhcpServerIp[1] == 0) && (_dhcpDhcpServerIp[2] == 0) && (_dhcpDhcpServerIp[3] == 0)) || (IPAddress(_dhcpDhcpServerIp) == _dhcpUdpSocket.remoteIP()))
|
---|
| 347 | {
|
---|
| 348 | _dhcpUdpSocket.read(_dhcpDhcpServerIp, sizeof(_dhcpDhcpServerIp));
|
---|
| 349 | }
|
---|
| 350 | else
|
---|
| 351 | {
|
---|
| 352 | // Skip over the rest of this option
|
---|
| 353 | while (opt_len--)
|
---|
| 354 | {
|
---|
| 355 | _dhcpUdpSocket.read();
|
---|
| 356 | }
|
---|
| 357 | }
|
---|
| 358 | break;
|
---|
| 359 |
|
---|
| 360 | case dhcpT1value :
|
---|
| 361 |
|
---|
| 362 | opt_len = _dhcpUdpSocket.read();
|
---|
| 363 | _dhcpUdpSocket.read((uint8_t*)&_dhcpT1, sizeof(_dhcpT1));
|
---|
| 364 | _dhcpT1 = ntohl(_dhcpT1);
|
---|
| 365 | break;
|
---|
| 366 |
|
---|
| 367 | case dhcpT2value :
|
---|
| 368 |
|
---|
| 369 | opt_len = _dhcpUdpSocket.read();
|
---|
| 370 | _dhcpUdpSocket.read((uint8_t*)&_dhcpT2, sizeof(_dhcpT2));
|
---|
| 371 | _dhcpT2 = ntohl(_dhcpT2);
|
---|
| 372 | break;
|
---|
| 373 |
|
---|
| 374 | case dhcpIPaddrLeaseTime :
|
---|
| 375 |
|
---|
| 376 | opt_len = _dhcpUdpSocket.read();
|
---|
| 377 | _dhcpUdpSocket.read((uint8_t*)&_dhcpLeaseTime, sizeof(_dhcpLeaseTime));
|
---|
| 378 | _dhcpLeaseTime = ntohl(_dhcpLeaseTime);
|
---|
| 379 | _renewInSec = _dhcpLeaseTime;
|
---|
| 380 | break;
|
---|
| 381 |
|
---|
| 382 | default :
|
---|
| 383 |
|
---|
| 384 | opt_len = _dhcpUdpSocket.read();
|
---|
| 385 | // Skip over the rest of this option
|
---|
| 386 | while (opt_len--)
|
---|
| 387 | {
|
---|
| 388 | _dhcpUdpSocket.read();
|
---|
| 389 | }
|
---|
| 390 | break;
|
---|
| 391 | }
|
---|
| 392 | }
|
---|
| 393 | }
|
---|
| 394 |
|
---|
| 395 | // Need to skip to end of the packet regardless here
|
---|
| 396 | _dhcpUdpSocket.flush();
|
---|
| 397 |
|
---|
| 398 | return type;
|
---|
| 399 | }
|
---|
| 400 |
|
---|
| 401 |
|
---|
| 402 | /*
|
---|
| 403 | returns:
|
---|
| 404 | 0/DHCP_CHECK_NONE: nothing happened
|
---|
| 405 | 1/DHCP_CHECK_RENEW_FAIL: renew failed
|
---|
| 406 | 2/DHCP_CHECK_RENEW_OK: renew success
|
---|
| 407 | 3/DHCP_CHECK_REBIND_FAIL: rebind fail
|
---|
| 408 | 4/DHCP_CHECK_REBIND_OK: rebind success
|
---|
| 409 | */
|
---|
| 410 | int DhcpClass::checkLease(){
|
---|
| 411 | //this uses a signed / unsigned trick to deal with millis overflow
|
---|
| 412 | unsigned long now = millis();
|
---|
| 413 | signed long snow = (long)now;
|
---|
| 414 | int rc=DHCP_CHECK_NONE;
|
---|
| 415 | if (_lastCheck != 0){
|
---|
| 416 | signed long factor;
|
---|
| 417 | //calc how many ms past the timeout we are
|
---|
| 418 | factor = snow - (long)_secTimeout;
|
---|
| 419 | //if on or passed the timeout, reduce the counters
|
---|
| 420 | if ( factor >= 0 ){
|
---|
| 421 | //next timeout should be now plus 1000 ms minus parts of second in factor
|
---|
| 422 | _secTimeout = snow + 1000 - factor % 1000;
|
---|
| 423 | //how many seconds late are we, minimum 1
|
---|
| 424 | factor = factor / 1000 +1;
|
---|
| 425 |
|
---|
| 426 | //reduce the counters by that mouch
|
---|
| 427 | //if we can assume that the cycle time (factor) is fairly constant
|
---|
| 428 | //and if the remainder is less than cycle time * 2
|
---|
| 429 | //do it early instead of late
|
---|
| 430 | if(_renewInSec < factor*2 )
|
---|
| 431 | _renewInSec = 0;
|
---|
| 432 | else
|
---|
| 433 | _renewInSec -= factor;
|
---|
| 434 |
|
---|
| 435 | if(_rebindInSec < factor*2 )
|
---|
| 436 | _rebindInSec = 0;
|
---|
| 437 | else
|
---|
| 438 | _rebindInSec -= factor;
|
---|
| 439 | }
|
---|
| 440 |
|
---|
| 441 | //if we have a lease but should renew, do it
|
---|
| 442 | if (_dhcp_state == STATE_DHCP_LEASED && _renewInSec <=0){
|
---|
| 443 | _dhcp_state = STATE_DHCP_REREQUEST;
|
---|
| 444 | rc = 1 + request_DHCP_lease();
|
---|
| 445 | }
|
---|
| 446 |
|
---|
| 447 | //if we have a lease or is renewing but should bind, do it
|
---|
| 448 | if( (_dhcp_state == STATE_DHCP_LEASED || _dhcp_state == STATE_DHCP_START) && _rebindInSec <=0){
|
---|
| 449 | //this should basically restart completely
|
---|
| 450 | _dhcp_state = STATE_DHCP_START;
|
---|
| 451 | reset_DHCP_lease();
|
---|
| 452 | rc = 3 + request_DHCP_lease();
|
---|
| 453 | }
|
---|
| 454 | }
|
---|
| 455 | else{
|
---|
| 456 | _secTimeout = snow + 1000;
|
---|
| 457 | }
|
---|
| 458 |
|
---|
| 459 | _lastCheck = now;
|
---|
| 460 | return rc;
|
---|
| 461 | }
|
---|
| 462 |
|
---|
| 463 | IPAddress DhcpClass::getLocalIp()
|
---|
| 464 | {
|
---|
| 465 | return IPAddress(_dhcpLocalIp);
|
---|
| 466 | }
|
---|
| 467 |
|
---|
| 468 | IPAddress DhcpClass::getSubnetMask()
|
---|
| 469 | {
|
---|
| 470 | return IPAddress(_dhcpSubnetMask);
|
---|
| 471 | }
|
---|
| 472 |
|
---|
| 473 | IPAddress DhcpClass::getGatewayIp()
|
---|
| 474 | {
|
---|
| 475 | return IPAddress(_dhcpGatewayIp);
|
---|
| 476 | }
|
---|
| 477 |
|
---|
| 478 | IPAddress DhcpClass::getDhcpServerIp()
|
---|
| 479 | {
|
---|
| 480 | return IPAddress(_dhcpDhcpServerIp);
|
---|
| 481 | }
|
---|
| 482 |
|
---|
| 483 | IPAddress DhcpClass::getDnsServerIp()
|
---|
| 484 | {
|
---|
| 485 | return IPAddress(_dhcpDnsServerIp);
|
---|
| 486 | }
|
---|
| 487 |
|
---|
| 488 | void DhcpClass::printByte(char * buf, uint8_t n ) {
|
---|
| 489 | char *str = &buf[1];
|
---|
| 490 | buf[0]='0';
|
---|
| 491 | do {
|
---|
| 492 | unsigned long m = n;
|
---|
| 493 | n /= 16;
|
---|
| 494 | char c = m - 16 * n;
|
---|
| 495 | *str-- = c < 10 ? c + '0' : c + 'A' - 10;
|
---|
| 496 | } while(n);
|
---|
| 497 | }
|
---|