AvrNetworkingExample/main.c at master · TheAngusMcFire/AvrNetworkingExample · GitHub

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#include <uart.h>
#include <network_controller.h>
#include <udp.h>
#include <utils.h>
#include <ethernet.h>
#include <arp.h>
#include <string.h>
#include <ip.h>
#include <net_utils.h>
#include <avr/io.h>

uint8_t buffer[900-67];
uint8_t tx_buffer[100];
uint8_t mac_addr[] = {0x80,0xe6,0x00,0x00,0x02,0xff};
uint8_t ip_addr[] = {192,168,1,230};

EthernetHeader eth_header_rcv;
EthernetHeader eth_header_tx;

ArpHeader      arp_header_rcv;
ArpHeader      arp_header_tx;

IpHeader       ip_header_rcv;
IpHeader       ip_header_tx;

void handleIcmp()
{
    //ipPrintHeader(&ip_header_rcv);
    if (ip_header_rcv.payload_ptr[0] != 8)
        return;

    uartWriteString("Echo(ping) recieved from: ");
    utilsPrintIpAddress(ip_header_rcv.src_addr);
    uartWriteString("\r\n");

    uint8_t icmp_size = icmpPrepareResponce(ip_header_rcv.payload_ptr, ip_header_rcv.payload_size, tx_buffer, sizeof(tx_buffer));
    ethernetBuildHeader(&eth_header_tx, eth_header_rcv.src_mac, mac_addr, ETH_TYPE_IPv4);
    ipPrepareHeader(&ip_header_tx, ip_header_rcv.src_addr, ip_addr, 1, icmp_size);

    uint8_t *tmp_buffer = buffer;

    tmp_buffer += ethernetHeaderToBuffer(&eth_header_tx, tmp_buffer);
    tmp_buffer += ipHeaderToBuffer(&ip_header_tx, tmp_buffer);
    memcpy(tmp_buffer, tx_buffer, icmp_size);
    tmp_buffer += icmp_size;
    uint16_t data_size = (uint16_t)(tmp_buffer - buffer);

    //uartWriteString("Data to write: ");
    //utilsPrintHex(buffer, data_size);

    networkControllerWriteByteStream(buffer, data_size);
}

void handleUdp()
{
    ipPrintHeader(&ip_header_rcv);
    uint8_t *udp_data = ip_header_rcv.payload_ptr;

    uint16_t src_port = udp_data[0] << 8 | udp_data[1];
    uint16_t dst_port = udp_data[2] << 8 | udp_data[3];
    uint16_t size =     udp_data[4] << 8 | udp_data[5];
    uint16_t checksum = udp_data[6] << 8 | udp_data[7];

    uartWriteString("\r\nSrc Port: ");
    utilsPrintInt(src_port);
    uartWriteString("\r\nDst Port: ");
    utilsPrintInt(dst_port);
    uartWriteString("\r\nSize: ");
    utilsPrintInt(size);
    uartWriteString("\r\nChecksum: ");
    utilsPrintUint16(checksum);
    uartWriteString("\r\n");

    uint8_t * payload_data = udp_data + 8;
    uint16_t  payload_size = size - 8;
    utilsWriteChars((const char*)payload_data, payload_size);

    DDRA |= _BV(4);

    if(memcmp(payload_data,"ON",2) == 0)
    {
        uartWriteString("led on\r\n");
        PORTA |= _BV(4);
    }

    if(memcmp(payload_data,"OFF",3) == 0)
    {
        uartWriteString("led off\r\n");
        PORTA &= ~_BV(4);
    }

}

int main()
{
    uartInit();
    utilsWriteLine("Startup Net code");
    networkControllerInit(mac_addr);
    utilsWriteLine("NC init fin...");

    while(1)
    {
        uint16_t data_size = networkControllerReadByteStream(buffer, sizeof(buffer));

        if(data_size == 0)
            continue;


        ethernetParseHeader(&eth_header_rcv, buffer, data_size);

        if(eth_header_rcv.eth_type == ETH_TYPE_ARP)
        {
            arpParseHeader(&arp_header_rcv, eth_header_rcv.payload_ptr, eth_header_rcv.payload_size);

            if(memcmp(arp_header_rcv.target_ip, ip_addr, 4))
                continue;

            utilsPrintSeperator();
            ethernetPrintHeader(&eth_header_rcv);
            arpPrintHeader(&arp_header_rcv);

            arpPrepareResponce(&arp_header_rcv, &arp_header_tx, mac_addr);
            arpPrintHeader(&arp_header_tx);

            ethernetBuildHeader(&eth_header_tx, eth_header_rcv.src_mac, mac_addr, ETH_TYPE_ARP);
            ethernetPrintHeader(&eth_header_tx);

            uint8_t * tmp_buffer = buffer;

            tmp_buffer += ethernetHeaderToBuffer(&eth_header_tx, tmp_buffer);
            tmp_buffer += arpHeaderToBuffer(&arp_header_tx, tmp_buffer);

            uint16_t data_size = (uint16_t)(tmp_buffer - buffer);
            uartWriteString("Data to write: ");
            utilsPrintHex(buffer, data_size);
            networkControllerWriteByteStream(buffer, data_size);
        }

        if(eth_header_rcv.eth_type == ETH_TYPE_IPv4)
        {
            ipParseHeader(&ip_header_rcv, eth_header_rcv.payload_ptr, eth_header_rcv.payload_size);

            //ICMP
            if(ip_header_rcv.protocol == 0x01)
            {
                handleIcmp();
            }

            if(ip_header_rcv.protocol == 17)
            {
                handleUdp();
            }
        }
    }

    return 0;
}