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/*
* Udp.cpp: Library to send/receive UDP packets with the Arduino ethernet shield.
* This version only offers minimal wrapping of socket.c/socket.h
* Drop Udp.h/.cpp into the Ethernet library directory at hardware/libraries/Ethernet/
*
* MIT License:
* Copyright (c) 2008 Bjoern Hartmann
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* bjoern@cs.stanford.edu 12/30/2008
*/
#include "w5100.h"
#include "socket.h"
#include "Ethernet.h"
#include "Udp.h"
#include "Dns.h"
/* Constructor */
UDP::UDP() : _sock(MAX_SOCK_NUM) {}
/* Start UDP socket, listening at local port PORT */
uint8_t UDP::begin(uint16_t port) {
if (_sock != MAX_SOCK_NUM)
return 0;
for (int i = 0; i < MAX_SOCK_NUM; i++) {
uint8_t s = W5100.readSnSR(i);
if (s == SnSR::CLOSED || s == SnSR::FIN_WAIT) {
_sock = i;
break;
}
}
if (_sock == MAX_SOCK_NUM)
return 0;
_port = port;
socket(_sock, SnMR::UDP, _port, 0);
return 1;
}
/* Is data available in rx buffer? Returns 0 if no, number of available bytes if yes.
* returned value includes 8 byte UDP header!*/
int UDP::available() {
return W5100.getRXReceivedSize(_sock);
}
/* Release any resources being used by this UDP instance */
void UDP::stop()
{
if (_sock == MAX_SOCK_NUM)
return;
close(_sock);
EthernetClass::_server_port[_sock] = 0;
_sock = MAX_SOCK_NUM;
}
int UDP::beginPacket(const char *host, uint16_t port)
{
// Look up the host first
int ret = 0;
DNSClient dns;
IPAddress remote_addr;
dns.begin(Ethernet.dnsServerIP());
ret = dns.getHostByName(host, remote_addr);
if (ret == 1) {
return beginPacket(remote_addr, port);
} else {
return ret;
}
}
int UDP::beginPacket(IPAddress ip, uint16_t port)
{
_offset = 0;
return startUDP(_sock, ip.raw_address(), port);
}
int UDP::endPacket()
{
return sendUDP(_sock);
}
void UDP::write(uint8_t byte)
{
write(&byte, 1);
}
void UDP::write(const char *str)
{
size_t len = strlen(str);
write((const uint8_t *)str, len);
}
void UDP::write(const uint8_t *buffer, size_t size)
{
uint16_t bytes_written = bufferData(_sock, _offset, buffer, size);
_offset += bytes_written;
}
int UDP::parsePacket()
{
if (available() > 0)
{
//HACK - hand-parse the UDP packet using TCP recv method
uint8_t tmpBuf[8];
int ret =0;
//read 8 header bytes and get IP and port from it
ret = recv(_sock,tmpBuf,8);
if (ret > 0)
{
_remoteIP = tmpBuf;
_remotePort = tmpBuf[4];
_remotePort = (_remotePort << 8) + tmpBuf[5];
// When we get here, any remaining bytes are the data
ret = available();
}
return ret;
}
// There aren't any packets available
return 0;
}
int UDP::read()
{
uint8_t byte;
if (recv(_sock, &byte, 1) > 0)
{
// We read things without any problems
return byte;
}
// If we get here, there's no data available
return -1;
}
int UDP::read(unsigned char* buffer, size_t len)
{
/* In the readPacket that copes with truncating packets, the buffer was
filled with this code. Not sure why it loops round reading out a byte
at a time.
int i;
for(i=0;i<(int)bufLen;i++) {
recv(_sock,tmpBuf,1);
buf[i]=tmpBuf[0];
}
*/
return recv(_sock, buffer, len);
}
int UDP::peek()
{
uint8_t b;
// Unlike recv, peek doesn't check to see if there's any data available, so we must
if (!available())
return -1;
::peek(_sock, &b);
return b;
}
void UDP::flush()
{
while (available())
{
read();
}
}
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