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peteralieb |
// fcpprotocol.cpp
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#include "fcpprotocol.hpp"
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#include "rawethernet.hpp"
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#include <iostream>
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#include <cstring>
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#include <arpa/inet.h>
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using namespace std;
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FCPProtocol::FCPProtocol()
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{
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this->snd_cur = 0;
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this->last_ack = 0;
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this->enet = new RawEthernet();
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}
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FCPProtocol::~FCPProtocol()
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{
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delete this->enet;
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}
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bool FCPProtocol::connect(byte mac[], byte ip[])
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{
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if (!this->enet->connect(mac)) return false;
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memcpy((void*)this->ip, (void*)ip, 4);
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// send connection request
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memcpy((void*)this->buffer, (void*)this->packet_con, 34);
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memcpy((void*)(this->buffer+16), (void*)ip, 4);
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if (!this->enet->sendData(this->buffer, 34)) return false;
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// receive conack
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if (!this->receiveFcpUdpIp(1500, this->buffer)) return false;
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if (this->buffer[28] != (byte)0x1) return false;
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memcpy((void*)(this->sendbuf+16), (void*)this->ip, 4);
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this->snd_cur = 1;
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this->last_ack = 0;
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return true;
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}
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void FCPProtocol::disconnect()
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{
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this->enet->disconnect();
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this->snd_cur = 0;
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this->last_ack = 0;
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}
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bool FCPProtocol::sendData(int channel, byte data[], int len)
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{
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// wrap in packet
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this->wrapFcpUdpIp(FCP_DATA_SND, channel, data, len);
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// send packet
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if (!this->enet->sendData(this->buffer, len+34)) return false;
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// receive ack
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if (!this->receiveFcpUdpIp(1500, this->buffer)) return false;
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int seq = (int) ntohs(*((short*)&this->buffer[30]));
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if ((seq != this->snd_cur) || (this->buffer[28] != 1)) return false;
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this->last_ack = seq;
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this->snd_cur = seq+1;
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//this->snd_cur++;
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return true;
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}
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bool FCPProtocol::requestData(int channel, int len, byte *data)
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{
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// send data request
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wrapFcpUdpIp(FCP_DATA_REQ, channel, NULL, len);
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if (!this->enet->sendData(this->buffer, 34)) return false;
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// receive data response
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if (!this->receiveFcpUdpIp(1500, this->buffer)) return false;
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int seq = (int) ntohs(*((short*)&this->buffer[30]));
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if ((seq != this->snd_cur) || (this->buffer[28] != 5)) return false;
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this->last_ack = seq;
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this->snd_cur = seq+1;
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memcpy((void*)data, (void*)(&this->buffer[34]), len);
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return true;
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}
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bool FCPProtocol::connected()
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{
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return (this->snd_cur > 0);
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}
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void FCPProtocol::wrapFcpUdpIp(byte command, int channel, byte *data, int len)
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{
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memcpy((void*)(this->buffer), (void*)this->ip_header, 20);
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memcpy((void*)(this->buffer+16), (void*)ip, 4);
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*((short*)&buffer[2]) = htons(34+len);
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//*** insert IP header checksum
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memcpy((void*)(this->buffer+20), (void*)this->udp_header, 8);
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*((short*)&buffer[24]) = htons(len+14);
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buffer[26] = 0;
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buffer[27] = 0;
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buffer[28] = command;
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buffer[29] = (byte)channel;
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*((short*)&(this->buffer[30])) = htons(this->snd_cur);
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*((short*)&(this->buffer[32])) = htons(len);
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if (len > 0 && data != NULL)
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memcpy((void*)(this->buffer+34), (void*)data, len);
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this->insertIPChecksum();
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}
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void FCPProtocol::insertIPChecksum()
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{
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int sum = 0;
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short* buf = (short*)this->buffer;
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for (int i=0; i<20; i++)
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{
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sum += (int) ntohs(buf[i]);
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if (sum > 0xffff)
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{
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sum = (sum & 0xffff) + 1;
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}
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}
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buf[5] = ~htons((short)sum&0xffff);
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}
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bool FCPProtocol::receiveFcpUdpIp(int len, byte *data)
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{
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for (int i=0; i<20; i++)
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{
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if (!this->enet->requestData(len, data)) return false;
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if (data[9] != 0x11) continue;
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if (ntohs(*((short*)(data+20))) != 0x3001) continue;
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if (ntohs(*((short*)(data+22))) != 0x3000) continue;
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return true;
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}
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return false;
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}
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const byte FCPProtocol::packet_con[] = {//0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0x45, 0, 0, 34/*len*/, 0, 0, 0, 0, 0x80, 0x11, 0, 0, 0xc0, 0xa8, 1, 0x66, 0, 0, 0, 0,
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0x30, 0, 0x30, 1, 0, 0x0e, 0, 0,
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0x02, 0, 0, 0, 0, 0};// len=34
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const byte FCPProtocol::ip_header[] = {0x45, 0, 0, 34, 0, 0, 0, 0, 0x80, 0x11, 0, 0, 0xc0, 0xa8, 1, 0x66, 0, 0, 0, 0};// len=20
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const byte FCPProtocol::udp_header[] = {0x30, 0, 0x30, 1, 0, 0x06, 0, 0};// len=8
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