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342 lines
9.9 KiB
C++
Executable File
342 lines
9.9 KiB
C++
Executable File
// DHCP Library v0.3 - April 25, 2009
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// Author: Jordan Terrell - blog.jordanterrell.com
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#include "w5100.h"
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#include <string.h>
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#include <stdlib.h>
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#include "Dhcp.h"
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#include "Arduino.h"
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#include "util.h"
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int DhcpClass::beginWithDHCP(uint8_t *mac, unsigned long timeout, unsigned long responseTimeout)
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{
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uint8_t dhcp_state = STATE_DHCP_START;
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uint8_t messageType = 0;
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// zero out _dhcpMacAddr, _dhcpSubnetMask, _dhcpGatewayIp, _dhcpLocalIp, _dhcpDhcpServerIp, _dhcpDnsServerIp
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memset(_dhcpMacAddr, 0, 26);
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memcpy((void*)_dhcpMacAddr, (void*)mac, 6);
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// Pick an initial transaction ID
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_dhcpTransactionId = random(1UL, 2000UL);
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_dhcpInitialTransactionId = _dhcpTransactionId;
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if (_dhcpUdpSocket.begin(DHCP_CLIENT_PORT) == 0)
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{
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// Couldn't get a socket
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return 0;
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}
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presend_DHCP();
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int result = 0;
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unsigned long startTime = millis();
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while(dhcp_state != STATE_DHCP_LEASED)
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{
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if(dhcp_state == STATE_DHCP_START)
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{
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_dhcpTransactionId++;
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send_DHCP_MESSAGE(DHCP_DISCOVER, ((millis() - startTime) / 1000));
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dhcp_state = STATE_DHCP_DISCOVER;
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}
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else if(dhcp_state == STATE_DHCP_DISCOVER)
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{
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uint32_t respId;
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messageType = parseDHCPResponse(responseTimeout, respId);
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if(messageType == DHCP_OFFER)
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{
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// We'll use the transaction ID that the offer came with,
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// rather than the one we were up to
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_dhcpTransactionId = respId;
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send_DHCP_MESSAGE(DHCP_REQUEST, ((millis() - startTime) / 1000));
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dhcp_state = STATE_DHCP_REQUEST;
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}
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}
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else if(dhcp_state == STATE_DHCP_REQUEST)
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{
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uint32_t respId;
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messageType = parseDHCPResponse(responseTimeout, respId);
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if(messageType == DHCP_ACK)
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{
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dhcp_state = STATE_DHCP_LEASED;
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result = 1;
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}
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else if(messageType == DHCP_NAK)
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dhcp_state = STATE_DHCP_START;
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}
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if(messageType == 255)
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{
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messageType = 0;
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dhcp_state = STATE_DHCP_START;
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}
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if(result != 1 && ((millis() - startTime) > timeout))
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break;
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}
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// We're done with the socket now
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_dhcpUdpSocket.stop();
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_dhcpTransactionId++;
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return result;
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}
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void DhcpClass::presend_DHCP()
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{
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}
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void DhcpClass::send_DHCP_MESSAGE(uint8_t messageType, uint16_t secondsElapsed)
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{
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uint8_t buffer[32];
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memset(buffer, 0, 32);
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IPAddress dest_addr( 255, 255, 255, 255 ); // Broadcast address
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if (-1 == _dhcpUdpSocket.beginPacket(dest_addr, DHCP_SERVER_PORT))
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{
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// FIXME Need to return errors
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return;
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}
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buffer[0] = DHCP_BOOTREQUEST; // op
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buffer[1] = DHCP_HTYPE10MB; // htype
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buffer[2] = DHCP_HLENETHERNET; // hlen
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buffer[3] = DHCP_HOPS; // hops
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// xid
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unsigned long xid = htonl(_dhcpTransactionId);
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memcpy(buffer + 4, &(xid), 4);
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// 8, 9 - seconds elapsed
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buffer[8] = ((secondsElapsed & 0xff00) >> 8);
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buffer[9] = (secondsElapsed & 0x00ff);
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// flags
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unsigned short flags = htons(DHCP_FLAGSBROADCAST);
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memcpy(buffer + 10, &(flags), 2);
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// ciaddr: already zeroed
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// yiaddr: already zeroed
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// siaddr: already zeroed
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// giaddr: already zeroed
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//put data in W5100 transmit buffer
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_dhcpUdpSocket.write(buffer, 28);
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memset(buffer, 0, 32); // clear local buffer
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memcpy(buffer, _dhcpMacAddr, 6); // chaddr
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//put data in W5100 transmit buffer
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_dhcpUdpSocket.write(buffer, 16);
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memset(buffer, 0, 32); // clear local buffer
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// leave zeroed out for sname && file
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// put in W5100 transmit buffer x 6 (192 bytes)
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for(int i = 0; i < 6; i++) {
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_dhcpUdpSocket.write(buffer, 32);
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}
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// OPT - Magic Cookie
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buffer[0] = (uint8_t)((MAGIC_COOKIE >> 24)& 0xFF);
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buffer[1] = (uint8_t)((MAGIC_COOKIE >> 16)& 0xFF);
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buffer[2] = (uint8_t)((MAGIC_COOKIE >> 8)& 0xFF);
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buffer[3] = (uint8_t)(MAGIC_COOKIE& 0xFF);
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// OPT - message type
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buffer[4] = dhcpMessageType;
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buffer[5] = 0x01;
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buffer[6] = messageType; //DHCP_REQUEST;
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// OPT - client identifier
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buffer[7] = dhcpClientIdentifier;
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buffer[8] = 0x07;
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buffer[9] = 0x01;
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memcpy(buffer + 10, _dhcpMacAddr, 6);
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// OPT - host name
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buffer[16] = hostName;
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buffer[17] = strlen(HOST_NAME) + 3; // length of hostname + last 3 bytes of mac address
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strcpy((char*)&(buffer[18]), HOST_NAME);
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buffer[24] = _dhcpMacAddr[3];
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buffer[25] = _dhcpMacAddr[4];
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buffer[26] = _dhcpMacAddr[5];
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//put data in W5100 transmit buffer
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_dhcpUdpSocket.write(buffer, 27);
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if(messageType == DHCP_REQUEST)
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{
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buffer[0] = dhcpRequestedIPaddr;
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buffer[1] = 0x04;
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buffer[2] = _dhcpLocalIp[0];
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buffer[3] = _dhcpLocalIp[1];
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buffer[4] = _dhcpLocalIp[2];
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buffer[5] = _dhcpLocalIp[3];
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buffer[6] = dhcpServerIdentifier;
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buffer[7] = 0x04;
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buffer[8] = _dhcpDhcpServerIp[0];
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buffer[9] = _dhcpDhcpServerIp[1];
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buffer[10] = _dhcpDhcpServerIp[2];
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buffer[11] = _dhcpDhcpServerIp[3];
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//put data in W5100 transmit buffer
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_dhcpUdpSocket.write(buffer, 12);
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}
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buffer[0] = dhcpParamRequest;
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buffer[1] = 0x06;
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buffer[2] = subnetMask;
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buffer[3] = routersOnSubnet;
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buffer[4] = dns;
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buffer[5] = domainName;
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buffer[6] = dhcpT1value;
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buffer[7] = dhcpT2value;
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buffer[8] = endOption;
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//put data in W5100 transmit buffer
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_dhcpUdpSocket.write(buffer, 9);
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_dhcpUdpSocket.endPacket();
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}
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uint8_t DhcpClass::parseDHCPResponse(unsigned long responseTimeout, uint32_t& transactionId)
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{
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uint8_t type = 0;
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uint8_t opt_len = 0;
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unsigned long startTime = millis();
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while(_dhcpUdpSocket.parsePacket() <= 0)
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{
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if((millis() - startTime) > responseTimeout)
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{
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return 255;
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}
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delay(50);
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}
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// start reading in the packet
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RIP_MSG_FIXED fixedMsg;
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_dhcpUdpSocket.read((uint8_t*)&fixedMsg, sizeof(RIP_MSG_FIXED));
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if(fixedMsg.op == DHCP_BOOTREPLY && _dhcpUdpSocket.remotePort() == DHCP_SERVER_PORT)
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{
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transactionId = ntohl(fixedMsg.xid);
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if(memcmp(fixedMsg.chaddr, _dhcpMacAddr, 6) != 0 || (transactionId < _dhcpInitialTransactionId) || (transactionId > _dhcpTransactionId))
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{
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// Need to read the rest of the packet here regardless
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_dhcpUdpSocket.flush();
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return 0;
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}
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memcpy(_dhcpLocalIp, fixedMsg.yiaddr, 4);
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// Skip to the option part
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// Doing this a byte at a time so we don't have to put a big buffer
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// on the stack (as we don't have lots of memory lying around)
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for (int i =0; i < (240 - sizeof(RIP_MSG_FIXED)); i++)
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{
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_dhcpUdpSocket.read(); // we don't care about the returned byte
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}
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while (_dhcpUdpSocket.available() > 0)
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{
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switch (_dhcpUdpSocket.read())
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{
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case endOption :
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break;
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case padOption :
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break;
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case dhcpMessageType :
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opt_len = _dhcpUdpSocket.read();
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type = _dhcpUdpSocket.read();
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break;
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case subnetMask :
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opt_len = _dhcpUdpSocket.read();
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_dhcpUdpSocket.read(_dhcpSubnetMask, 4);
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break;
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case routersOnSubnet :
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opt_len = _dhcpUdpSocket.read();
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_dhcpUdpSocket.read(_dhcpGatewayIp, 4);
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break;
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case dns :
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opt_len = _dhcpUdpSocket.read();
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_dhcpUdpSocket.read(_dhcpDnsServerIp, 4);
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break;
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case dhcpServerIdentifier :
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opt_len = _dhcpUdpSocket.read();
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if( *((uint32_t*)_dhcpDhcpServerIp) == 0 ||
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IPAddress(_dhcpDhcpServerIp) == _dhcpUdpSocket.remoteIP() )
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{
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_dhcpUdpSocket.read(_dhcpDhcpServerIp, sizeof(_dhcpDhcpServerIp));
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}
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else
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{
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// Skip over the rest of this option
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while (opt_len--)
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{
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_dhcpUdpSocket.read();
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}
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}
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break;
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case dhcpIPaddrLeaseTime :
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default :
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opt_len = _dhcpUdpSocket.read();
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// Skip over the rest of this option
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while (opt_len--)
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{
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_dhcpUdpSocket.read();
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}
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break;
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}
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}
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}
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// Need to skip to end of the packet regardless here
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_dhcpUdpSocket.flush();
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return type;
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}
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IPAddress DhcpClass::getLocalIp()
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{
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return IPAddress(_dhcpLocalIp);
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}
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IPAddress DhcpClass::getSubnetMask()
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{
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return IPAddress(_dhcpSubnetMask);
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}
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IPAddress DhcpClass::getGatewayIp()
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{
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return IPAddress(_dhcpGatewayIp);
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}
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IPAddress DhcpClass::getDhcpServerIp()
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{
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return IPAddress(_dhcpDhcpServerIp);
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}
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IPAddress DhcpClass::getDnsServerIp()
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{
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return IPAddress(_dhcpDnsServerIp);
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}
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