Esempio n. 1
0
uint8_t handle_ethernet_packet()
{
  uint16_t packet_size = 0;
  
  packet_size = Enc28j60PacketReceive(sizeof(ethernet_buffer), ethernet_buffer);

  if (packet_size == 0){
    return 0; 
  }
  // char buffer[30];
  // sprintf(buffer, "ETH packet length: %" PRIu16, packet_size);
  // DBG_DYNAMIC(buffer);
  
  struct ethernet_header * header = (struct ethernet_header*)ethernet_buffer;

  packet_size -=sizeof(*header);
  
  uint8_t* data = (uint8_t*)(header +1);
  
  uint8_t ret=1;
  switch(header->type)
  {
    case HTON16(ETHERNET_TYPE_IP):
      //DBG_STATIC("Recieved IP packet.");
      //IP handle packet
      ret = ip_handle_packet((struct ip_header*)data,packet_size,(const ethernet_address*)&header->src);
      break;
    case HTON16(ETHERNET_TYPE_ARP):
      //DBG_STATIC("Recieved ARP packet.");
      //ARP handle packet
      ret = arp_handle_packet((struct arp_header*)data,packet_size);
      // if(ret){
        // DBG_STATIC("ARP packet successfully handled.");
      // } else {
        // DBG_STATIC("ARP packet FAILURE.")
      // }
      break;
    default:
      return 0;
  }
  ethernet_stats.rx_packets++;
  return ret;
}
Esempio n. 2
0
void LanTask (void)
{
   uint16_t plen, dat_p = 0;
   bool send;
   
   while (1)
   {
      plen = Enc28j60PacketReceive(BUFFER_SIZE, buf);
         /*plen will unequal to zero if there is a valid packet (without crc error) */
      if (plen == 0) return;

      // arp is broadcast if unknown but a host may also verify the mac address by sending it to a unicast address.
      if (Eth_type_is_arp_and_my_ip(buf, plen))
      {
         Make_arp_answer_from_request(buf);
         continue;
      }
      // check if the ip packet is for us:
      if (Eth_type_is_ip_and_my_ip(buf, plen) == 0)
      {
         continue;
      }
      // ping
      if((buf[IP_PROTO_P] == IP_PROTO_ICMP_V) && (buf[ICMP_TYPE_P] == ICMP_TYPE_ECHOREQUEST_V))
      {
         Make_echo_reply_from_request(buf, plen);
         continue;
      }

      // tcp port www start, compare only the lower byte
      if ((buf[IP_PROTO_P] == IP_PROTO_TCP_V) && (buf[TCP_DST_PORT_H_P] == 0) && (buf[TCP_DST_PORT_L_P] == mywwwport))
      {
         if (buf[TCP_FLAGS_P] & TCP_FLAGS_SYN_V)
         {
            Make_tcp_synack_from_syn(buf); // make_tcp_synack_from_syn does already send the syn,ack
            continue;
         }
         if (buf[TCP_FLAGS_P] & TCP_FLAGS_ACK_V)
         {
            Init_len_info(buf); // init some data structures
            dat_p = Get_tcp_data_pointer();
            if (dat_p == 0)
            { 
               // we can possibly have no data, just ack:
               if (buf[TCP_FLAGS_P] & TCP_FLAGS_FIN_V)
               {
                  Make_tcp_ack_from_any(buf);
               }
               continue;
            }
         }
         send = false;
         if (strncmp("GET ",(char *) & (buf[dat_p]), 4) != 0)
         {
          	// head, post and other methods for possible status codes see:
            // http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
            plen = Fill_tcp_data_p(buf, 0, PSTR("HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n<h1>200 OK</h1>"));
            send = true;
         }

	      if (!send)
         {
            char *p;
            p = (char*) &(buf[dat_p+4]);  // start of incomming payload
            switch (GetCommand(p))
            {
               case 0:
                  break;
               case 1:
                  countUp0 = false;
                  break;
			   case 2:
                  countUp0 = true;
                  break;
            }
			
            plen = PrintWebpage(buf);
            send = true;
         }

         Make_tcp_ack_from_any(buf); // send ack for http get
         Make_tcp_ack_with_data(buf, plen); // send data
		 continue;       
      }


		// udp interface:
        if (buf[IP_PROTO_P]==IP_PROTO_UDP_V)
		{
        	uint8_t payloadlen=buf[UDP_LEN_L_P]-UDP_HEADER_LEN;
            // the received command has to start with t and be 4 char long
            // e.g "test\0"
            if(payloadlen)
			{
				char msg1[]="Hello";
				Make_udp_reply_from_request(buf,msg1,sizeof(msg1),MYUDPPORT);
			}
         }// End udp interface.

   }// End while(1)

}// End LanTask