void loop(){
plen = es.ES_enc28j60PacketReceive (BUFFER_SIZE, buf);
/*plen will be unequal to zero if there is a valid packet (without crc error) */
if (plen != 0){
if (es.ES_eth_type_is_arp_and_my_ip (buf,plen)) {
es.ES_make_arp_answer_from_request (buf);
}
// check if ip packets (icmp or udp) are for us:
if (es.ES_eth_type_is_ip_and_my_ip (buf,plen)!=0) {
if (buf[IP_PROTO_P] == IP_PROTO_ICMP_V && buf[ICMP_TYPE_P] == ICMP_TYPE_ECHOREQUEST_V) {
// a ping packet, let's send pong
es.ES_make_echo_reply_from_request (buf, plen);
}
}
}
}
char* ETHER_28J60::serviceRequest()
{
uint16_t dat_p;
int8_t cmd;
plen = es.ES_enc28j60PacketReceive(BUFFER_SIZE, buf);
/*plen will ne unequal to zero if there is a valid packet (without crc error) */
if(plen!=0)
{
// arp is broadcast if unknown but a host may also verify the mac address by sending it to a unicast address.
if (es.ES_eth_type_is_arp_and_my_ip(buf, plen))
{
es.ES_make_arp_answer_from_request(buf);
return 0;
}
// check if ip packets are for us:
if (es.ES_eth_type_is_ip_and_my_ip(buf, plen) == 0)
{
return 0;
}
if (buf[IP_PROTO_P]==IP_PROTO_ICMP_V && buf[ICMP_TYPE_P]==ICMP_TYPE_ECHOREQUEST_V)
{
es.ES_make_echo_reply_from_request(buf, plen);
return 0;
}
// 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] == _port)
{
if (buf[TCP_FLAGS_P] & TCP_FLAGS_SYN_V)
{
es.ES_make_tcp_synack_from_syn(buf); // make_tcp_synack_from_syn does already send the syn,ack
return 0;
}
if (buf[TCP_FLAGS_P] & TCP_FLAGS_ACK_V)
{
es.ES_init_len_info(buf); // init some data structures
dat_p=es.ES_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)
{
es.ES_make_tcp_ack_from_any(buf);
}
return 0;
}
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=es.ES_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>"));
plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("<h1>A</h1>"));
respond();
}
if (strncmp("/",(char *)&(buf[dat_p+4]),1)==0) // was "/ " and 2
{
// Copy the request action before we overwrite it with the response
int i = 0;
while (buf[dat_p+5+i] != ' ' && i < STR_BUFFER_SIZE)
{
strbuf[i] = buf[dat_p+5+i];
i++;
}
strbuf[i] = '\0';
plen=es.ES_fill_tcp_data_p(buf,0,PSTR("HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n"));
return (char*)strbuf;
}
}
}
}
}