void flushSockets() {
if (!(packetLength = enc28j60PacketReceive(BUFFER_SIZE, buffer))) { //No packet available for reading!
return;
}
else if (eth_type_is_arp_and_my_ip(buffer, packetLength)) {
if (arp_packet_is_myreply_arp(buffer)) {
#ifdef ETHERSHIELD_DEBUG
ethershieldDebug("Received ARP reply.\r\n");
#endif
// Add it to the arp cache list
add_arpcacheentry(buffer+ETH_SRC_MAC_P, buffer+ETH_ARP_DST_IP_P);
}
else {
make_arp_answer_from_request(buffer);
#ifdef ETHERSHIELD_DEBUG
ethershieldDebug("Answering ARP request.\r\n");
#endif
}
}
else if (!eth_type_is_ip_and_my_ip(buffer, packetLength)) {
#ifdef ETHERSHIELD_DEBUG
ethershieldDebug("Ignoring packet not for me.\r\n");
#endif
return;
}
else if (buffer[IP_PROTO_P] == IP_PROTO_ICMP_V &&
buffer[ICMP_TYPE_P] == ICMP_TYPE_ECHOREQUEST_V) {
make_echo_reply_from_request(buffer, packetLength);
#ifdef ETHERSHIELD_DEBUG
sprintf(debugStr, "Replying ICMP ECHO REQUEST from %d.%d.%d.%d.\r\n",
buffer[IP_SRC_IP_P], buffer[IP_SRC_IP_P + 1],
buffer[IP_SRC_IP_P + 2], buffer[IP_SRC_IP_P + 3]);
ethershieldDebug(debugStr);
#endif
}
else if (buffer[IP_PROTO_P] == IP_PROTO_TCP_V) {
//DEBUG: it's TCP and for me! Do I want it?
uint16_t destinationPort = (buffer[TCP_DST_PORT_H_P] << 8) | buffer[TCP_DST_PORT_L_P];
#ifdef ETHERSHIELD_DEBUG
sprintf(debugStr, "Received TCP packet from %d.%d.%d.%d:%u on port %d\r\n",
buffer[IP_SRC_IP_P], buffer[IP_SRC_IP_P + 1],
buffer[IP_SRC_IP_P + 2], buffer[IP_SRC_IP_P + 3],
(buffer[TCP_SRC_PORT_H_P] << 8) | buffer[TCP_SRC_PORT_L_P],
destinationPort);
ethershieldDebug(debugStr);
#endif
uint8_t i, socketSelected = MAX_SOCK_NUM;
for (i = 0; i < MAX_SOCK_NUM; i++) {
if (_SOCKETS[i].sourcePort == destinationPort) {
socketSelected = i;
if(_SOCKETS[i].state == SOCK_LISTEN) {
_SOCKETS[i].destinationPort = (buffer[TCP_SRC_PORT_H_P] << 8) | buffer[TCP_SRC_PORT_L_P];
memcpy(_SOCKETS[i].destinationIp, &buffer[IP_SRC_IP_P], 4);
}
break;
}
}
#ifdef ETHERSHIELD_DEBUG
ethershieldDebug(" Socket selected: ");
itoa(socketSelected, debugStr, 10);
ethershieldDebug(debugStr);
ethershieldDebug("\r\n");
#endif
if (socketSelected == MAX_SOCK_NUM) {
//TODO: reply and say that nobody is listening on that port
return;
}
//TODO: change next 'if' to 'else if'
//DEBUG: ok, the TCP packet is for me and I want it.
if (buffer[TCP_FLAGS_P] == (TCP_FLAG_SYN_V | TCP_FLAG_ACK_V)) {
#ifdef ETHERSHIELD_DEBUG
ethershieldDebug(" It is TCP SYNACK, sending ACK\r\n");
#endif
make_tcp_ack_from_any(buffer);
//TODO: verify if I'm waiting for this SYN+ACK
_SOCKETS[socketSelected].clientState = SOCK_ESTABLISHED;
return;
}
else if (buffer[TCP_FLAGS_P] & TCP_FLAGS_SYN_V) {
#ifdef ETHERSHIELD_DEBUG
ethershieldDebug(" It is TCP SYN, sending SYNACK\r\n");
#endif
_SOCKETS[socketSelected].state = SOCK_ESTABLISHED;
make_tcp_synack_from_syn(buffer);
}
else if (buffer[TCP_FLAGS_P] & TCP_FLAGS_ACK_V) {
uint16_t data;
#ifdef ETHERSHIELD_DEBUG
ethershieldDebug(" Got an ACK...\r\n");
#endif
init_len_info(buffer);
_SOCKETS[socketSelected].packets = 0;
_SOCKETS[socketSelected].ackNumber = (uint32_t)buffer[TCP_SEQ_H_P] << 24 | (uint32_t)buffer[TCP_SEQ_H_P + 1] << 16 | (uint32_t)buffer[TCP_SEQ_L_P] << 8 | (uint32_t)buffer[TCP_SEQ_L_P + 1];
data = get_tcp_data_pointer();
if (!data) {
#ifdef ETHERSHIELD_DEBUG
ethershieldDebug(" It is ACK with no data\r\n");
#endif
if (buffer[TCP_FLAGS_P] & TCP_FLAGS_FIN_V) {
#ifdef ETHERSHIELD_DEBUG
ethershieldDebug(" It is ACKFIN, closing socket\r\n");
#endif
make_tcp_ack_from_any(buffer);
_SOCKETS[socketSelected].state = SOCK_CLOSED;
_SOCKETS[socketSelected].sendPacketLength = 0;
_SOCKETS[socketSelected].ackNumber = 0;
_SOCKETS[socketSelected].sentData = 0;
_SOCKETS[socketSelected].packets = 0;
free(_SOCKETS[socketSelected].dataBuffer);
_SOCKETS[socketSelected].bytesToRead = 0;
}
return;
}
else {
int dataSize;
make_tcp_ack_from_any(buffer); //TODO-ACK
_SOCKETS[socketSelected].ackNumber = (uint32_t)buffer[TCP_SEQACK_H_P] << 24 | (uint32_t)buffer[TCP_SEQACK_H_P + 1] << 16 | (uint32_t)buffer[TCP_SEQACK_L_P] << 8 | (uint32_t)buffer[TCP_SEQACK_L_P + 1];
dataSize = packetLength - (&buffer[data] - buffer);
#ifdef ETHERSHIELD_DEBUG
itoa(dataSize, debugStr, 10);
ethershieldDebug(" It is ACK with data, ACK sent\r\n");
ethershieldDebug(" # bytes: ");
ethershieldDebug(debugStr);
ethershieldDebug("\r\n");
#endif
_SOCKETS[socketSelected].state = SOCK_ESTABLISHED;
if(_SOCKETS[socketSelected].bytesToRead > 0) {
_SOCKETS[socketSelected].dataBuffer = realloc(_SOCKETS[socketSelected].dataBuffer, _SOCKETS[socketSelected].bytesToRead + (dataSize * sizeof(char))); //TODO: and about the TCP/IP/Ethernet overhead?
memcpy(_SOCKETS[socketSelected].dataBuffer+_SOCKETS[socketSelected].bytesToRead, &buffer[data], dataSize);
} else {
_SOCKETS[socketSelected].dataBuffer = malloc(dataSize * sizeof(char)); //TODO: and about the TCP/IP/Ethernet overhead?
memcpy(_SOCKETS[socketSelected].dataBuffer, &buffer[data], dataSize);
}
//TODO: Add handler to malloc returning: No enough SRAM)
_SOCKETS[socketSelected].bytesToRead += dataSize;
#ifdef ETHERSHIELD_DEBUG
ethershieldDebug(" Data:\r\n");
for (i = 0; i < dataSize; i++) {
serial_write(_SOCKETS[socketSelected].dataBuffer[i]);
}
ethershieldDebug("\r\n");
#endif
return;
}
}
else {
#ifdef ETHERSHIELD_DEBUG
ethershieldDebug("Don't know what to do!\r\n");
#endif
//make_tcp_ack_from_any(buffer); //TODO-ACK: send ACK using tcp_client_send_packet
}
}
}
uint8_t EtherShield::ES_arp_packet_is_myreply_arp ( uint8_t *buf ){
return arp_packet_is_myreply_arp (buf);
}
uint8_t EtherShieldWrapper::ESW_arp_packet_is_myreply_arp ( uint8_t *buf ){
return arp_packet_is_myreply_arp (buf);
}