cassyarduino cassyarduino / UIPEthernet

UIPEthernet library for Arduino IDE, Eclipse with arduino plugin and MBED/SMeshStudio (AVR,STM32F,ESP8266,Intel ARC32,Nordic nRF51,Teensy boards,Realtek Ameba(RTL8195A,RTL8710)), ENC28j60 network chip. Compatible with Wiznet W5100 Ethernet library API. Compiled and tested on Nucleo-F302R8. Master repository is: https://github.com/UIPEthernet/UIPEthernet/

Dhcp.cpp@0:e3fb1267e3c3, 2016-12-21 (annotated)

Committer:
cassyarduino
Date:
Wed Dec 21 16:58:10 2016 +0100
Revision:
0:e3fb1267e3c3
Child:
30:1ec7fa7f2e6a
initial release

Who changed what in which revision?

UserRevisionLine numberNew contents of line
cassyarduino 0:e3fb1267e3c3 1 // DHCP Library v0.3 - April 25, 2009
cassyarduino 0:e3fb1267e3c3 2 // Author: Jordan Terrell - blog.jordanterrell.com
cassyarduino 0:e3fb1267e3c3 3
cassyarduino 0:e3fb1267e3c3 4 #include <string.h>
cassyarduino 0:e3fb1267e3c3 5 #include <stdlib.h>
cassyarduino 0:e3fb1267e3c3 6 #include "Dhcp.h"
cassyarduino 0:e3fb1267e3c3 7 #if defined(ARDUINO)
cassyarduino 0:e3fb1267e3c3 8 #include <Arduino.h>
cassyarduino 0:e3fb1267e3c3 9 #endif
cassyarduino 0:e3fb1267e3c3 10 #if defined(__MBED__)
cassyarduino 0:e3fb1267e3c3 11 #include <mbed.h>
cassyarduino 0:e3fb1267e3c3 12 #include "mbed/millis.h"
cassyarduino 0:e3fb1267e3c3 13 #define delay(x) wait_ms(x)
cassyarduino 0:e3fb1267e3c3 14 #endif
cassyarduino 0:e3fb1267e3c3 15 #include "utility/logging.h"
cassyarduino 0:e3fb1267e3c3 16 #include "utility/uip.h"
cassyarduino 0:e3fb1267e3c3 17
cassyarduino 0:e3fb1267e3c3 18 int DhcpClass::beginWithDHCP(uint8_t *mac, unsigned long timeout, unsigned long responseTimeout)
cassyarduino 0:e3fb1267e3c3 19 {
cassyarduino 0:e3fb1267e3c3 20 _dhcpLeaseTime=0;
cassyarduino 0:e3fb1267e3c3 21 _dhcpT1=0;
cassyarduino 0:e3fb1267e3c3 22 _dhcpT2=0;
cassyarduino 0:e3fb1267e3c3 23 _lastCheck=0;
cassyarduino 0:e3fb1267e3c3 24 _timeout = timeout;
cassyarduino 0:e3fb1267e3c3 25 _responseTimeout = responseTimeout;
cassyarduino 0:e3fb1267e3c3 26
cassyarduino 0:e3fb1267e3c3 27 // zero out _dhcpMacAddr
cassyarduino 0:e3fb1267e3c3 28 memset(_dhcpMacAddr, 0, 6);
cassyarduino 0:e3fb1267e3c3 29 reset_DHCP_lease();
cassyarduino 0:e3fb1267e3c3 30
cassyarduino 0:e3fb1267e3c3 31 memcpy((void*)_dhcpMacAddr, (void*)mac, 6);
cassyarduino 0:e3fb1267e3c3 32 _dhcp_state = STATE_DHCP_START;
cassyarduino 0:e3fb1267e3c3 33 return request_DHCP_lease();
cassyarduino 0:e3fb1267e3c3 34 }
cassyarduino 0:e3fb1267e3c3 35
cassyarduino 0:e3fb1267e3c3 36 void DhcpClass::reset_DHCP_lease(void){
cassyarduino 0:e3fb1267e3c3 37 // zero out _dhcpSubnetMask, _dhcpGatewayIp, _dhcpLocalIp, _dhcpDhcpServerIp, _dhcpDnsServerIp
cassyarduino 0:e3fb1267e3c3 38 memset(_dhcpLocalIp, 0, 20);
cassyarduino 0:e3fb1267e3c3 39 }
cassyarduino 0:e3fb1267e3c3 40
cassyarduino 0:e3fb1267e3c3 41 //return:0 on error, 1 if request is sent and response is received
cassyarduino 0:e3fb1267e3c3 42 int DhcpClass::request_DHCP_lease(void){
cassyarduino 0:e3fb1267e3c3 43
cassyarduino 0:e3fb1267e3c3 44 uint8_t messageType = 0;
cassyarduino 0:e3fb1267e3c3 45
cassyarduino 0:e3fb1267e3c3 46
cassyarduino 0:e3fb1267e3c3 47
cassyarduino 0:e3fb1267e3c3 48 // Pick an initial transaction ID
cassyarduino 0:e3fb1267e3c3 49 #if defined(ARDUINO)
cassyarduino 0:e3fb1267e3c3 50 _dhcpTransactionId = random(1UL, 2000UL);
cassyarduino 0:e3fb1267e3c3 51 #endif
cassyarduino 0:e3fb1267e3c3 52 #if defined(__MBED__)
cassyarduino 0:e3fb1267e3c3 53 _dhcpTransactionId = (rand() % 2000UL) + 1;
cassyarduino 0:e3fb1267e3c3 54 #endif
cassyarduino 0:e3fb1267e3c3 55 _dhcpInitialTransactionId = _dhcpTransactionId;
cassyarduino 0:e3fb1267e3c3 56
cassyarduino 0:e3fb1267e3c3 57 _dhcpUdpSocket.stop();
cassyarduino 0:e3fb1267e3c3 58 if (_dhcpUdpSocket.begin(DHCP_CLIENT_PORT) == 0)
cassyarduino 0:e3fb1267e3c3 59 {
cassyarduino 0:e3fb1267e3c3 60 // Couldn't get a socket
cassyarduino 0:e3fb1267e3c3 61 return 0;
cassyarduino 0:e3fb1267e3c3 62 }
cassyarduino 0:e3fb1267e3c3 63
cassyarduino 0:e3fb1267e3c3 64 presend_DHCP();
cassyarduino 0:e3fb1267e3c3 65
cassyarduino 0:e3fb1267e3c3 66 int result = 0;
cassyarduino 0:e3fb1267e3c3 67
cassyarduino 0:e3fb1267e3c3 68 unsigned long startTime = millis();
cassyarduino 0:e3fb1267e3c3 69
cassyarduino 0:e3fb1267e3c3 70 while(_dhcp_state != STATE_DHCP_LEASED)
cassyarduino 0:e3fb1267e3c3 71 {
cassyarduino 0:e3fb1267e3c3 72 if(_dhcp_state == STATE_DHCP_START)
cassyarduino 0:e3fb1267e3c3 73 {
cassyarduino 0:e3fb1267e3c3 74 _dhcpTransactionId++;
cassyarduino 0:e3fb1267e3c3 75
cassyarduino 0:e3fb1267e3c3 76 send_DHCP_MESSAGE(DHCP_DISCOVER, ((millis() - startTime) / 1000));
cassyarduino 0:e3fb1267e3c3 77 _dhcp_state = STATE_DHCP_DISCOVER;
cassyarduino 0:e3fb1267e3c3 78 }
cassyarduino 0:e3fb1267e3c3 79 else if(_dhcp_state == STATE_DHCP_REREQUEST){
cassyarduino 0:e3fb1267e3c3 80 _dhcpTransactionId++;
cassyarduino 0:e3fb1267e3c3 81 send_DHCP_MESSAGE(DHCP_REQUEST, ((millis() - startTime)/1000));
cassyarduino 0:e3fb1267e3c3 82 _dhcp_state = STATE_DHCP_REQUEST;
cassyarduino 0:e3fb1267e3c3 83 }
cassyarduino 0:e3fb1267e3c3 84 else if(_dhcp_state == STATE_DHCP_DISCOVER)
cassyarduino 0:e3fb1267e3c3 85 {
cassyarduino 0:e3fb1267e3c3 86 uint32_t respId;
cassyarduino 0:e3fb1267e3c3 87 messageType = parseDHCPResponse(_responseTimeout, respId);
cassyarduino 0:e3fb1267e3c3 88 if(messageType == DHCP_OFFER)
cassyarduino 0:e3fb1267e3c3 89 {
cassyarduino 0:e3fb1267e3c3 90 // We'll use the transaction ID that the offer came with,
cassyarduino 0:e3fb1267e3c3 91 // rather than the one we were up to
cassyarduino 0:e3fb1267e3c3 92 _dhcpTransactionId = respId;
cassyarduino 0:e3fb1267e3c3 93 send_DHCP_MESSAGE(DHCP_REQUEST, ((millis() - startTime) / 1000));
cassyarduino 0:e3fb1267e3c3 94 _dhcp_state = STATE_DHCP_REQUEST;
cassyarduino 0:e3fb1267e3c3 95 }
cassyarduino 0:e3fb1267e3c3 96 }
cassyarduino 0:e3fb1267e3c3 97 else if(_dhcp_state == STATE_DHCP_REQUEST)
cassyarduino 0:e3fb1267e3c3 98 {
cassyarduino 0:e3fb1267e3c3 99 uint32_t respId;
cassyarduino 0:e3fb1267e3c3 100 messageType = parseDHCPResponse(_responseTimeout, respId);
cassyarduino 0:e3fb1267e3c3 101 if(messageType == DHCP_ACK)
cassyarduino 0:e3fb1267e3c3 102 {
cassyarduino 0:e3fb1267e3c3 103 _dhcp_state = STATE_DHCP_LEASED;
cassyarduino 0:e3fb1267e3c3 104 result = 1;
cassyarduino 0:e3fb1267e3c3 105 //use default lease time if we didn't get it
cassyarduino 0:e3fb1267e3c3 106 if(_dhcpLeaseTime == 0){
cassyarduino 0:e3fb1267e3c3 107 _dhcpLeaseTime = DEFAULT_LEASE;
cassyarduino 0:e3fb1267e3c3 108 }
cassyarduino 0:e3fb1267e3c3 109 //calculate T1 & T2 if we didn't get it
cassyarduino 0:e3fb1267e3c3 110 if(_dhcpT1 == 0){
cassyarduino 0:e3fb1267e3c3 111 //T1 should be 50% of _dhcpLeaseTime
cassyarduino 0:e3fb1267e3c3 112 _dhcpT1 = _dhcpLeaseTime >> 1;
cassyarduino 0:e3fb1267e3c3 113 }
cassyarduino 0:e3fb1267e3c3 114 if(_dhcpT2 == 0){
cassyarduino 0:e3fb1267e3c3 115 //T2 should be 87.5% (7/8ths) of _dhcpLeaseTime
cassyarduino 0:e3fb1267e3c3 116 _dhcpT2 = _dhcpT1 << 1;
cassyarduino 0:e3fb1267e3c3 117 }
cassyarduino 0:e3fb1267e3c3 118 _renewInSec = _dhcpT1;
cassyarduino 0:e3fb1267e3c3 119 _rebindInSec = _dhcpT2;
cassyarduino 0:e3fb1267e3c3 120 }
cassyarduino 0:e3fb1267e3c3 121 else if(messageType == DHCP_NAK)
cassyarduino 0:e3fb1267e3c3 122 _dhcp_state = STATE_DHCP_START;
cassyarduino 0:e3fb1267e3c3 123 }
cassyarduino 0:e3fb1267e3c3 124
cassyarduino 0:e3fb1267e3c3 125 if(messageType == 255)
cassyarduino 0:e3fb1267e3c3 126 {
cassyarduino 0:e3fb1267e3c3 127 messageType = 0;
cassyarduino 0:e3fb1267e3c3 128 _dhcp_state = STATE_DHCP_START;
cassyarduino 0:e3fb1267e3c3 129 }
cassyarduino 0:e3fb1267e3c3 130
cassyarduino 0:e3fb1267e3c3 131 if(result != 1 && ((millis() - startTime) > _timeout))
cassyarduino 0:e3fb1267e3c3 132 break;
cassyarduino 0:e3fb1267e3c3 133 }
cassyarduino 0:e3fb1267e3c3 134
cassyarduino 0:e3fb1267e3c3 135 // We're done with the socket now
cassyarduino 0:e3fb1267e3c3 136 _dhcpUdpSocket.stop();
cassyarduino 0:e3fb1267e3c3 137 _dhcpTransactionId++;
cassyarduino 0:e3fb1267e3c3 138
cassyarduino 0:e3fb1267e3c3 139 return result;
cassyarduino 0:e3fb1267e3c3 140 }
cassyarduino 0:e3fb1267e3c3 141
cassyarduino 0:e3fb1267e3c3 142 void DhcpClass::presend_DHCP(void)
cassyarduino 0:e3fb1267e3c3 143 {
cassyarduino 0:e3fb1267e3c3 144 }
cassyarduino 0:e3fb1267e3c3 145
cassyarduino 0:e3fb1267e3c3 146 void DhcpClass::send_DHCP_MESSAGE(uint8_t messageType, uint16_t secondsElapsed)
cassyarduino 0:e3fb1267e3c3 147 {
cassyarduino 0:e3fb1267e3c3 148 uint8_t buffer[32];
cassyarduino 0:e3fb1267e3c3 149 memset(buffer, 0, 32);
cassyarduino 0:e3fb1267e3c3 150 IPAddress dest_addr( 255, 255, 255, 255 ); // Broadcast address
cassyarduino 0:e3fb1267e3c3 151
cassyarduino 0:e3fb1267e3c3 152 if (-1 == _dhcpUdpSocket.beginPacket(dest_addr, DHCP_SERVER_PORT))
cassyarduino 0:e3fb1267e3c3 153 {
cassyarduino 0:e3fb1267e3c3 154 // FIXME Need to return errors
cassyarduino 0:e3fb1267e3c3 155 return;
cassyarduino 0:e3fb1267e3c3 156 }
cassyarduino 0:e3fb1267e3c3 157
cassyarduino 0:e3fb1267e3c3 158 buffer[0] = DHCP_BOOTREQUEST; // op
cassyarduino 0:e3fb1267e3c3 159 buffer[1] = DHCP_HTYPE10MB; // htype
cassyarduino 0:e3fb1267e3c3 160 buffer[2] = DHCP_HLENETHERNET; // hlen
cassyarduino 0:e3fb1267e3c3 161 buffer[3] = DHCP_HOPS; // hops
cassyarduino 0:e3fb1267e3c3 162
cassyarduino 0:e3fb1267e3c3 163 // xid
cassyarduino 0:e3fb1267e3c3 164 unsigned long xid = htonl(_dhcpTransactionId);
cassyarduino 0:e3fb1267e3c3 165 memcpy(buffer + 4, &(xid), 4);
cassyarduino 0:e3fb1267e3c3 166
cassyarduino 0:e3fb1267e3c3 167 // 8, 9 - seconds elapsed
cassyarduino 0:e3fb1267e3c3 168 buffer[8] = ((secondsElapsed & 0xff00) >> 8);
cassyarduino 0:e3fb1267e3c3 169 buffer[9] = (secondsElapsed & 0x00ff);
cassyarduino 0:e3fb1267e3c3 170
cassyarduino 0:e3fb1267e3c3 171 // flags
cassyarduino 0:e3fb1267e3c3 172 unsigned short flags = htons(DHCP_FLAGSBROADCAST);
cassyarduino 0:e3fb1267e3c3 173 memcpy(buffer + 10, &(flags), 2);
cassyarduino 0:e3fb1267e3c3 174
cassyarduino 0:e3fb1267e3c3 175 // ciaddr: already zeroed
cassyarduino 0:e3fb1267e3c3 176 // yiaddr: already zeroed
cassyarduino 0:e3fb1267e3c3 177 // siaddr: already zeroed
cassyarduino 0:e3fb1267e3c3 178 // giaddr: already zeroed
cassyarduino 0:e3fb1267e3c3 179
cassyarduino 0:e3fb1267e3c3 180 //put data in W5100 transmit buffer
cassyarduino 0:e3fb1267e3c3 181 _dhcpUdpSocket.write(buffer, 28);
cassyarduino 0:e3fb1267e3c3 182
cassyarduino 0:e3fb1267e3c3 183 memset(buffer, 0, 32); // clear local buffer
cassyarduino 0:e3fb1267e3c3 184
cassyarduino 0:e3fb1267e3c3 185 memcpy(buffer, _dhcpMacAddr, 6); // chaddr
cassyarduino 0:e3fb1267e3c3 186
cassyarduino 0:e3fb1267e3c3 187 //put data in W5100 transmit buffer
cassyarduino 0:e3fb1267e3c3 188 _dhcpUdpSocket.write(buffer, 16);
cassyarduino 0:e3fb1267e3c3 189
cassyarduino 0:e3fb1267e3c3 190 memset(buffer, 0, 32); // clear local buffer
cassyarduino 0:e3fb1267e3c3 191
cassyarduino 0:e3fb1267e3c3 192 // leave zeroed out for sname && file
cassyarduino 0:e3fb1267e3c3 193 // put in W5100 transmit buffer x 6 (192 bytes)
cassyarduino 0:e3fb1267e3c3 194
cassyarduino 0:e3fb1267e3c3 195 for(int i = 0; i < 6; i++) {
cassyarduino 0:e3fb1267e3c3 196 _dhcpUdpSocket.write(buffer, 32);
cassyarduino 0:e3fb1267e3c3 197 }
cassyarduino 0:e3fb1267e3c3 198
cassyarduino 0:e3fb1267e3c3 199 // OPT - Magic Cookie
cassyarduino 0:e3fb1267e3c3 200 buffer[0] = (uint8_t)((MAGIC_COOKIE >> 24)& 0xFF);
cassyarduino 0:e3fb1267e3c3 201 buffer[1] = (uint8_t)((MAGIC_COOKIE >> 16)& 0xFF);
cassyarduino 0:e3fb1267e3c3 202 buffer[2] = (uint8_t)((MAGIC_COOKIE >> 8)& 0xFF);
cassyarduino 0:e3fb1267e3c3 203 buffer[3] = (uint8_t)(MAGIC_COOKIE& 0xFF);
cassyarduino 0:e3fb1267e3c3 204
cassyarduino 0:e3fb1267e3c3 205 // OPT - message type
cassyarduino 0:e3fb1267e3c3 206 buffer[4] = dhcpMessageType;
cassyarduino 0:e3fb1267e3c3 207 buffer[5] = 0x01;
cassyarduino 0:e3fb1267e3c3 208 buffer[6] = messageType; //DHCP_REQUEST;
cassyarduino 0:e3fb1267e3c3 209
cassyarduino 0:e3fb1267e3c3 210 // OPT - client identifier
cassyarduino 0:e3fb1267e3c3 211 buffer[7] = dhcpClientIdentifier;
cassyarduino 0:e3fb1267e3c3 212 buffer[8] = 0x07;
cassyarduino 0:e3fb1267e3c3 213 buffer[9] = 0x01;
cassyarduino 0:e3fb1267e3c3 214 memcpy(buffer + 10, _dhcpMacAddr, 6);
cassyarduino 0:e3fb1267e3c3 215
cassyarduino 0:e3fb1267e3c3 216 // OPT - host name
cassyarduino 0:e3fb1267e3c3 217 buffer[16] = hostName;
cassyarduino 0:e3fb1267e3c3 218 buffer[17] = strlen(HOST_NAME) + 6; // length of hostname + last 3 bytes of mac address
cassyarduino 0:e3fb1267e3c3 219 strcpy((char*)&(buffer[18]), HOST_NAME);
cassyarduino 0:e3fb1267e3c3 220
cassyarduino 0:e3fb1267e3c3 221 printByte((char*)&(buffer[24]), _dhcpMacAddr[3]);
cassyarduino 0:e3fb1267e3c3 222 printByte((char*)&(buffer[26]), _dhcpMacAddr[4]);
cassyarduino 0:e3fb1267e3c3 223 printByte((char*)&(buffer[28]), _dhcpMacAddr[5]);
cassyarduino 0:e3fb1267e3c3 224
cassyarduino 0:e3fb1267e3c3 225 //put data in W5100 transmit buffer
cassyarduino 0:e3fb1267e3c3 226 _dhcpUdpSocket.write(buffer, 30);
cassyarduino 0:e3fb1267e3c3 227
cassyarduino 0:e3fb1267e3c3 228 if(messageType == DHCP_REQUEST)
cassyarduino 0:e3fb1267e3c3 229 {
cassyarduino 0:e3fb1267e3c3 230 buffer[0] = dhcpRequestedIPaddr;
cassyarduino 0:e3fb1267e3c3 231 buffer[1] = 0x04;
cassyarduino 0:e3fb1267e3c3 232 buffer[2] = _dhcpLocalIp[0];
cassyarduino 0:e3fb1267e3c3 233 buffer[3] = _dhcpLocalIp[1];
cassyarduino 0:e3fb1267e3c3 234 buffer[4] = _dhcpLocalIp[2];
cassyarduino 0:e3fb1267e3c3 235 buffer[5] = _dhcpLocalIp[3];
cassyarduino 0:e3fb1267e3c3 236
cassyarduino 0:e3fb1267e3c3 237 buffer[6] = dhcpServerIdentifier;
cassyarduino 0:e3fb1267e3c3 238 buffer[7] = 0x04;
cassyarduino 0:e3fb1267e3c3 239 buffer[8] = _dhcpDhcpServerIp[0];
cassyarduino 0:e3fb1267e3c3 240 buffer[9] = _dhcpDhcpServerIp[1];
cassyarduino 0:e3fb1267e3c3 241 buffer[10] = _dhcpDhcpServerIp[2];
cassyarduino 0:e3fb1267e3c3 242 buffer[11] = _dhcpDhcpServerIp[3];
cassyarduino 0:e3fb1267e3c3 243
cassyarduino 0:e3fb1267e3c3 244 //put data in W5100 transmit buffer
cassyarduino 0:e3fb1267e3c3 245 _dhcpUdpSocket.write(buffer, 12);
cassyarduino 0:e3fb1267e3c3 246 }
cassyarduino 0:e3fb1267e3c3 247
cassyarduino 0:e3fb1267e3c3 248 buffer[0] = dhcpParamRequest;
cassyarduino 0:e3fb1267e3c3 249 buffer[1] = 0x06;
cassyarduino 0:e3fb1267e3c3 250 buffer[2] = subnetMask;
cassyarduino 0:e3fb1267e3c3 251 buffer[3] = routersOnSubnet;
cassyarduino 0:e3fb1267e3c3 252 buffer[4] = dns;
cassyarduino 0:e3fb1267e3c3 253 buffer[5] = domainName;
cassyarduino 0:e3fb1267e3c3 254 buffer[6] = dhcpT1value;
cassyarduino 0:e3fb1267e3c3 255 buffer[7] = dhcpT2value;
cassyarduino 0:e3fb1267e3c3 256 buffer[8] = endOption;
cassyarduino 0:e3fb1267e3c3 257
cassyarduino 0:e3fb1267e3c3 258 //put data in W5100 transmit buffer
cassyarduino 0:e3fb1267e3c3 259 _dhcpUdpSocket.write(buffer, 9);
cassyarduino 0:e3fb1267e3c3 260
cassyarduino 0:e3fb1267e3c3 261 _dhcpUdpSocket.endPacket();
cassyarduino 0:e3fb1267e3c3 262 }
cassyarduino 0:e3fb1267e3c3 263
cassyarduino 0:e3fb1267e3c3 264 uint8_t DhcpClass::parseDHCPResponse(unsigned long responseTimeout, uint32_t& transactionId)
cassyarduino 0:e3fb1267e3c3 265 {
cassyarduino 0:e3fb1267e3c3 266 uint8_t type = 0;
cassyarduino 0:e3fb1267e3c3 267 uint8_t opt_len = 0;
cassyarduino 0:e3fb1267e3c3 268
cassyarduino 0:e3fb1267e3c3 269 unsigned long startTime = millis();
cassyarduino 0:e3fb1267e3c3 270
cassyarduino 0:e3fb1267e3c3 271 while(_dhcpUdpSocket.parsePacket() <= 0)
cassyarduino 0:e3fb1267e3c3 272 {
cassyarduino 0:e3fb1267e3c3 273 if((millis() - startTime) > responseTimeout)
cassyarduino 0:e3fb1267e3c3 274 {
cassyarduino 0:e3fb1267e3c3 275 return 255;
cassyarduino 0:e3fb1267e3c3 276 }
cassyarduino 0:e3fb1267e3c3 277 delay(50);
cassyarduino 0:e3fb1267e3c3 278 }
cassyarduino 0:e3fb1267e3c3 279 // start reading in the packet
cassyarduino 0:e3fb1267e3c3 280 RIP_MSG_FIXED fixedMsg;
cassyarduino 0:e3fb1267e3c3 281 _dhcpUdpSocket.read((char*)&fixedMsg, sizeof(RIP_MSG_FIXED));
cassyarduino 0:e3fb1267e3c3 282
cassyarduino 0:e3fb1267e3c3 283 if(fixedMsg.op == DHCP_BOOTREPLY && _dhcpUdpSocket.remotePort() == DHCP_SERVER_PORT)
cassyarduino 0:e3fb1267e3c3 284 {
cassyarduino 0:e3fb1267e3c3 285 transactionId = ntohl(fixedMsg.xid);
cassyarduino 0:e3fb1267e3c3 286 if(memcmp(fixedMsg.chaddr, _dhcpMacAddr, 6) != 0 || (transactionId < _dhcpInitialTransactionId) || (transactionId > _dhcpTransactionId))
cassyarduino 0:e3fb1267e3c3 287 {
cassyarduino 0:e3fb1267e3c3 288 // Need to read the rest of the packet here regardless
cassyarduino 0:e3fb1267e3c3 289 _dhcpUdpSocket.flush();
cassyarduino 0:e3fb1267e3c3 290 return 0;
cassyarduino 0:e3fb1267e3c3 291 }
cassyarduino 0:e3fb1267e3c3 292
cassyarduino 0:e3fb1267e3c3 293 memcpy(_dhcpLocalIp, fixedMsg.yiaddr, 4);
cassyarduino 0:e3fb1267e3c3 294
cassyarduino 0:e3fb1267e3c3 295 // Skip to the option part
cassyarduino 0:e3fb1267e3c3 296 // Doing this a byte at a time so we don't have to put a big buffer
cassyarduino 0:e3fb1267e3c3 297 // on the stack (as we don't have lots of memory lying around)
cassyarduino 0:e3fb1267e3c3 298 for (int i =0; i < (240 - (int)sizeof(RIP_MSG_FIXED)); i++)
cassyarduino 0:e3fb1267e3c3 299 {
cassyarduino 0:e3fb1267e3c3 300 _dhcpUdpSocket.read(); // we don't care about the returned byte
cassyarduino 0:e3fb1267e3c3 301 }
cassyarduino 0:e3fb1267e3c3 302
cassyarduino 0:e3fb1267e3c3 303 while (_dhcpUdpSocket.available() > 0)
cassyarduino 0:e3fb1267e3c3 304 {
cassyarduino 0:e3fb1267e3c3 305 switch (_dhcpUdpSocket.read())
cassyarduino 0:e3fb1267e3c3 306 {
cassyarduino 0:e3fb1267e3c3 307 case endOption :
cassyarduino 0:e3fb1267e3c3 308 break;
cassyarduino 0:e3fb1267e3c3 309
cassyarduino 0:e3fb1267e3c3 310 case padOption :
cassyarduino 0:e3fb1267e3c3 311 break;
cassyarduino 0:e3fb1267e3c3 312
cassyarduino 0:e3fb1267e3c3 313 case dhcpMessageType :
cassyarduino 0:e3fb1267e3c3 314 opt_len = _dhcpUdpSocket.read();
cassyarduino 0:e3fb1267e3c3 315 type = _dhcpUdpSocket.read();
cassyarduino 0:e3fb1267e3c3 316 break;
cassyarduino 0:e3fb1267e3c3 317
cassyarduino 0:e3fb1267e3c3 318 case subnetMask :
cassyarduino 0:e3fb1267e3c3 319 opt_len = _dhcpUdpSocket.read();
cassyarduino 0:e3fb1267e3c3 320 _dhcpUdpSocket.read((char*)_dhcpSubnetMask, 4);
cassyarduino 0:e3fb1267e3c3 321 break;
cassyarduino 0:e3fb1267e3c3 322
cassyarduino 0:e3fb1267e3c3 323 case routersOnSubnet :
cassyarduino 0:e3fb1267e3c3 324 opt_len = _dhcpUdpSocket.read();
cassyarduino 0:e3fb1267e3c3 325 _dhcpUdpSocket.read((char*)_dhcpGatewayIp, 4);
cassyarduino 0:e3fb1267e3c3 326 for (int i = 0; i < opt_len-4; i++)
cassyarduino 0:e3fb1267e3c3 327 {
cassyarduino 0:e3fb1267e3c3 328 _dhcpUdpSocket.read();
cassyarduino 0:e3fb1267e3c3 329 }
cassyarduino 0:e3fb1267e3c3 330 break;
cassyarduino 0:e3fb1267e3c3 331
cassyarduino 0:e3fb1267e3c3 332 case dns :
cassyarduino 0:e3fb1267e3c3 333 opt_len = _dhcpUdpSocket.read();
cassyarduino 0:e3fb1267e3c3 334 _dhcpUdpSocket.read((char*)_dhcpDnsServerIp, 4);
cassyarduino 0:e3fb1267e3c3 335 for (int i = 0; i < opt_len-4; i++)
cassyarduino 0:e3fb1267e3c3 336 {
cassyarduino 0:e3fb1267e3c3 337 _dhcpUdpSocket.read();
cassyarduino 0:e3fb1267e3c3 338 }
cassyarduino 0:e3fb1267e3c3 339 break;
cassyarduino 0:e3fb1267e3c3 340
cassyarduino 0:e3fb1267e3c3 341 case dhcpServerIdentifier :
cassyarduino 0:e3fb1267e3c3 342 opt_len = _dhcpUdpSocket.read();
cassyarduino 0:e3fb1267e3c3 343 if( *((uint32_t*)_dhcpDhcpServerIp) == 0 ||
cassyarduino 0:e3fb1267e3c3 344 IPAddress(_dhcpDhcpServerIp) == _dhcpUdpSocket.remoteIP() )
cassyarduino 0:e3fb1267e3c3 345 {
cassyarduino 0:e3fb1267e3c3 346 _dhcpUdpSocket.read((char*)_dhcpDhcpServerIp, sizeof(_dhcpDhcpServerIp));
cassyarduino 0:e3fb1267e3c3 347 }
cassyarduino 0:e3fb1267e3c3 348 else
cassyarduino 0:e3fb1267e3c3 349 {
cassyarduino 0:e3fb1267e3c3 350 // Skip over the rest of this option
cassyarduino 0:e3fb1267e3c3 351 while (opt_len--)
cassyarduino 0:e3fb1267e3c3 352 {
cassyarduino 0:e3fb1267e3c3 353 _dhcpUdpSocket.read();
cassyarduino 0:e3fb1267e3c3 354 }
cassyarduino 0:e3fb1267e3c3 355 }
cassyarduino 0:e3fb1267e3c3 356 break;
cassyarduino 0:e3fb1267e3c3 357
cassyarduino 0:e3fb1267e3c3 358 case dhcpT1value :
cassyarduino 0:e3fb1267e3c3 359 opt_len = _dhcpUdpSocket.read();
cassyarduino 0:e3fb1267e3c3 360 _dhcpUdpSocket.read((char*)&_dhcpT1, sizeof(_dhcpT1));
cassyarduino 0:e3fb1267e3c3 361 _dhcpT1 = ntohl(_dhcpT1);
cassyarduino 0:e3fb1267e3c3 362 break;
cassyarduino 0:e3fb1267e3c3 363
cassyarduino 0:e3fb1267e3c3 364 case dhcpT2value :
cassyarduino 0:e3fb1267e3c3 365 opt_len = _dhcpUdpSocket.read();
cassyarduino 0:e3fb1267e3c3 366 _dhcpUdpSocket.read((char*)&_dhcpT2, sizeof(_dhcpT2));
cassyarduino 0:e3fb1267e3c3 367 _dhcpT2 = ntohl(_dhcpT2);
cassyarduino 0:e3fb1267e3c3 368 break;
cassyarduino 0:e3fb1267e3c3 369
cassyarduino 0:e3fb1267e3c3 370 case dhcpIPaddrLeaseTime :
cassyarduino 0:e3fb1267e3c3 371 opt_len = _dhcpUdpSocket.read();
cassyarduino 0:e3fb1267e3c3 372 _dhcpUdpSocket.read((char*)&_dhcpLeaseTime, sizeof(_dhcpLeaseTime));
cassyarduino 0:e3fb1267e3c3 373 _dhcpLeaseTime = ntohl(_dhcpLeaseTime);
cassyarduino 0:e3fb1267e3c3 374 _renewInSec = _dhcpLeaseTime;
cassyarduino 0:e3fb1267e3c3 375 break;
cassyarduino 0:e3fb1267e3c3 376
cassyarduino 0:e3fb1267e3c3 377 default :
cassyarduino 0:e3fb1267e3c3 378 opt_len = _dhcpUdpSocket.read();
cassyarduino 0:e3fb1267e3c3 379 // Skip over the rest of this option
cassyarduino 0:e3fb1267e3c3 380 while (opt_len--)
cassyarduino 0:e3fb1267e3c3 381 {
cassyarduino 0:e3fb1267e3c3 382 _dhcpUdpSocket.read();
cassyarduino 0:e3fb1267e3c3 383 }
cassyarduino 0:e3fb1267e3c3 384 break;
cassyarduino 0:e3fb1267e3c3 385 }
cassyarduino 0:e3fb1267e3c3 386 }
cassyarduino 0:e3fb1267e3c3 387 }
cassyarduino 0:e3fb1267e3c3 388
cassyarduino 0:e3fb1267e3c3 389 // Need to skip to end of the packet regardless here
cassyarduino 0:e3fb1267e3c3 390 _dhcpUdpSocket.flush();
cassyarduino 0:e3fb1267e3c3 391
cassyarduino 0:e3fb1267e3c3 392 return type;
cassyarduino 0:e3fb1267e3c3 393 }
cassyarduino 0:e3fb1267e3c3 394
cassyarduino 0:e3fb1267e3c3 395
cassyarduino 0:e3fb1267e3c3 396 /*
cassyarduino 0:e3fb1267e3c3 397 returns:
cassyarduino 0:e3fb1267e3c3 398 0/DHCP_CHECK_NONE: nothing happened
cassyarduino 0:e3fb1267e3c3 399 1/DHCP_CHECK_RENEW_FAIL: renew failed
cassyarduino 0:e3fb1267e3c3 400 2/DHCP_CHECK_RENEW_OK: renew success
cassyarduino 0:e3fb1267e3c3 401 3/DHCP_CHECK_REBIND_FAIL: rebind fail
cassyarduino 0:e3fb1267e3c3 402 4/DHCP_CHECK_REBIND_OK: rebind success
cassyarduino 0:e3fb1267e3c3 403 */
cassyarduino 0:e3fb1267e3c3 404 int DhcpClass::checkLease(void){
cassyarduino 0:e3fb1267e3c3 405 //this uses a signed / unsigned trick to deal with millis overflow
cassyarduino 0:e3fb1267e3c3 406 unsigned long now = millis();
cassyarduino 0:e3fb1267e3c3 407 signed long snow = (long)now;
cassyarduino 0:e3fb1267e3c3 408 int rc=DHCP_CHECK_NONE;
cassyarduino 0:e3fb1267e3c3 409 if (_lastCheck != 0){
cassyarduino 0:e3fb1267e3c3 410 signed long factor;
cassyarduino 0:e3fb1267e3c3 411 //calc how many ms past the timeout we are
cassyarduino 0:e3fb1267e3c3 412 factor = snow - (long)_secTimeout;
cassyarduino 0:e3fb1267e3c3 413 //if on or passed the timeout, reduce the counters
cassyarduino 0:e3fb1267e3c3 414 if ( factor >= 0 ){
cassyarduino 0:e3fb1267e3c3 415 //next timeout should be now plus 1000 ms minus parts of second in factor
cassyarduino 0:e3fb1267e3c3 416 _secTimeout = snow + 1000 - factor % 1000;
cassyarduino 0:e3fb1267e3c3 417 //how many seconds late are we, minimum 1
cassyarduino 0:e3fb1267e3c3 418 factor = factor / 1000 +1;
cassyarduino 0:e3fb1267e3c3 419
cassyarduino 0:e3fb1267e3c3 420 //reduce the counters by that mouch
cassyarduino 0:e3fb1267e3c3 421 //if we can assume that the cycle time (factor) is fairly constant
cassyarduino 0:e3fb1267e3c3 422 //and if the remainder is less than cycle time * 2
cassyarduino 0:e3fb1267e3c3 423 //do it early instead of late
cassyarduino 0:e3fb1267e3c3 424 if(_renewInSec < factor*2 )
cassyarduino 0:e3fb1267e3c3 425 _renewInSec = 0;
cassyarduino 0:e3fb1267e3c3 426 else
cassyarduino 0:e3fb1267e3c3 427 _renewInSec -= factor;
cassyarduino 0:e3fb1267e3c3 428
cassyarduino 0:e3fb1267e3c3 429 if(_rebindInSec < factor*2 )
cassyarduino 0:e3fb1267e3c3 430 _rebindInSec = 0;
cassyarduino 0:e3fb1267e3c3 431 else
cassyarduino 0:e3fb1267e3c3 432 _rebindInSec -= factor;
cassyarduino 0:e3fb1267e3c3 433 }
cassyarduino 0:e3fb1267e3c3 434
cassyarduino 0:e3fb1267e3c3 435 //if we have a lease but should renew, do it
cassyarduino 0:e3fb1267e3c3 436 if (_dhcp_state == STATE_DHCP_LEASED && _renewInSec <=0){
cassyarduino 0:e3fb1267e3c3 437 _dhcp_state = STATE_DHCP_REREQUEST;
cassyarduino 0:e3fb1267e3c3 438 rc = 1 + request_DHCP_lease();
cassyarduino 0:e3fb1267e3c3 439 }
cassyarduino 0:e3fb1267e3c3 440
cassyarduino 0:e3fb1267e3c3 441 //if we have a lease or is renewing but should bind, do it
cassyarduino 0:e3fb1267e3c3 442 if( (_dhcp_state == STATE_DHCP_LEASED || _dhcp_state == STATE_DHCP_START) && _rebindInSec <=0){
cassyarduino 0:e3fb1267e3c3 443 //this should basically restart completely
cassyarduino 0:e3fb1267e3c3 444 _dhcp_state = STATE_DHCP_START;
cassyarduino 0:e3fb1267e3c3 445 reset_DHCP_lease();
cassyarduino 0:e3fb1267e3c3 446 rc = 3 + request_DHCP_lease();
cassyarduino 0:e3fb1267e3c3 447 }
cassyarduino 0:e3fb1267e3c3 448 }
cassyarduino 0:e3fb1267e3c3 449 else{
cassyarduino 0:e3fb1267e3c3 450 _secTimeout = snow + 1000;
cassyarduino 0:e3fb1267e3c3 451 }
cassyarduino 0:e3fb1267e3c3 452
cassyarduino 0:e3fb1267e3c3 453 _lastCheck = now;
cassyarduino 0:e3fb1267e3c3 454 return rc;
cassyarduino 0:e3fb1267e3c3 455 }
cassyarduino 0:e3fb1267e3c3 456
cassyarduino 0:e3fb1267e3c3 457 IPAddress DhcpClass::getLocalIp(void)
cassyarduino 0:e3fb1267e3c3 458 {
cassyarduino 0:e3fb1267e3c3 459 return IPAddress(_dhcpLocalIp);
cassyarduino 0:e3fb1267e3c3 460 }
cassyarduino 0:e3fb1267e3c3 461
cassyarduino 0:e3fb1267e3c3 462 IPAddress DhcpClass::getSubnetMask(void)
cassyarduino 0:e3fb1267e3c3 463 {
cassyarduino 0:e3fb1267e3c3 464 return IPAddress(_dhcpSubnetMask);
cassyarduino 0:e3fb1267e3c3 465 }
cassyarduino 0:e3fb1267e3c3 466
cassyarduino 0:e3fb1267e3c3 467 IPAddress DhcpClass::getGatewayIp(void)
cassyarduino 0:e3fb1267e3c3 468 {
cassyarduino 0:e3fb1267e3c3 469 return IPAddress(_dhcpGatewayIp);
cassyarduino 0:e3fb1267e3c3 470 }
cassyarduino 0:e3fb1267e3c3 471
cassyarduino 0:e3fb1267e3c3 472 IPAddress DhcpClass::getDhcpServerIp(void)
cassyarduino 0:e3fb1267e3c3 473 {
cassyarduino 0:e3fb1267e3c3 474 return IPAddress(_dhcpDhcpServerIp);
cassyarduino 0:e3fb1267e3c3 475 }
cassyarduino 0:e3fb1267e3c3 476
cassyarduino 0:e3fb1267e3c3 477 IPAddress DhcpClass::getDnsServerIp(void)
cassyarduino 0:e3fb1267e3c3 478 {
cassyarduino 0:e3fb1267e3c3 479 return IPAddress(_dhcpDnsServerIp);
cassyarduino 0:e3fb1267e3c3 480 }
cassyarduino 0:e3fb1267e3c3 481
cassyarduino 0:e3fb1267e3c3 482 void DhcpClass::printByte(char * buf, uint8_t n ) {
cassyarduino 0:e3fb1267e3c3 483 char *str = &buf[1];
cassyarduino 0:e3fb1267e3c3 484 buf[0]='0';
cassyarduino 0:e3fb1267e3c3 485 do {
cassyarduino 0:e3fb1267e3c3 486 unsigned long m = n;
cassyarduino 0:e3fb1267e3c3 487 n /= 16;
cassyarduino 0:e3fb1267e3c3 488 char c = m - 16 * n;
cassyarduino 0:e3fb1267e3c3 489 *str-- = c < 10 ? c + '0' : c + 'A' - 10;
cassyarduino 0:e3fb1267e3c3 490 } while(n);
cassyarduino 0:e3fb1267e3c3 491 }