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219 lines
5.1 KiB
C++
219 lines
5.1 KiB
C++
/*
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* Udp.cpp: Library to send/receive UDP packets with the Arduino ethernet shield.
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* This version only offers minimal wrapping of socket.c/socket.h
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* Drop Udp.h/.cpp into the Ethernet library directory at hardware/libraries/Ethernet/
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*
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* MIT License:
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* Copyright (c) 2008 Bjoern Hartmann
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* bjoern@cs.stanford.edu 12/30/2008
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*/
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#include "w5100.h"
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#include "socket.h"
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#include "Ethernet.h"
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#include "Udp.h"
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#include "Dns.h"
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/* Constructor */
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EthernetUDP::EthernetUDP() : _sock(MAX_SOCK_NUM) {}
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/* Start EthernetUDP socket, listening at local port PORT */
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uint8_t EthernetUDP::begin(uint16_t port) {
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if (_sock != MAX_SOCK_NUM)
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return 0;
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for (int i = 0; i < MAX_SOCK_NUM; i++) {
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uint8_t s = W5100.readSnSR(i);
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if (s == SnSR::CLOSED || s == SnSR::FIN_WAIT) {
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_sock = i;
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break;
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}
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}
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if (_sock == MAX_SOCK_NUM)
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return 0;
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_port = port;
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_remaining = 0;
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socket(_sock, SnMR::UDP, _port, 0);
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return 1;
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}
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/* return number of bytes available in the current packet,
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will return zero if parsePacket hasn't been called yet */
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int EthernetUDP::available() {
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return _remaining;
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}
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/* Release any resources being used by this EthernetUDP instance */
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void EthernetUDP::stop()
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{
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if (_sock == MAX_SOCK_NUM)
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return;
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close(_sock);
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EthernetClass::_server_port[_sock] = 0;
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_sock = MAX_SOCK_NUM;
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}
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int EthernetUDP::beginPacket(const char *host, uint16_t port)
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{
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// Look up the host first
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int ret = 0;
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DNSClient dns;
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IPAddress remote_addr;
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dns.begin(Ethernet.dnsServerIP());
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ret = dns.getHostByName(host, remote_addr);
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if (ret == 1) {
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return beginPacket(remote_addr, port);
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} else {
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return ret;
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}
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}
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int EthernetUDP::beginPacket(IPAddress ip, uint16_t port)
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{
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_offset = 0;
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return startUDP(_sock, rawIPAddress(ip), port);
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}
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int EthernetUDP::endPacket()
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{
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return sendUDP(_sock);
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}
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size_t EthernetUDP::write(uint8_t byte)
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{
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return write(&byte, 1);
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}
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size_t EthernetUDP::write(const uint8_t *buffer, size_t size)
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{
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uint16_t bytes_written = bufferData(_sock, _offset, buffer, size);
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_offset += bytes_written;
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return bytes_written;
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}
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int EthernetUDP::parsePacket()
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{
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// discard any remaining bytes in the last packet
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flush();
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if (W5100.getRXReceivedSize(_sock) > 0)
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{
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//HACK - hand-parse the UDP packet using TCP recv method
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uint8_t tmpBuf[8];
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int ret =0;
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//read 8 header bytes and get IP and port from it
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ret = recv(_sock,tmpBuf,8);
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if (ret > 0)
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{
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_remoteIP = tmpBuf;
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_remotePort = tmpBuf[4];
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_remotePort = (_remotePort << 8) + tmpBuf[5];
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_remaining = tmpBuf[6];
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_remaining = (_remaining << 8) + tmpBuf[7];
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// When we get here, any remaining bytes are the data
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ret = _remaining;
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}
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return ret;
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}
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// There aren't any packets available
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return 0;
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}
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int EthernetUDP::read()
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{
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uint8_t byte;
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if ((_remaining > 0) && (recv(_sock, &byte, 1) > 0))
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{
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// We read things without any problems
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_remaining--;
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return byte;
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}
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// If we get here, there's no data available
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return -1;
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}
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int EthernetUDP::read(unsigned char* buffer, size_t len)
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{
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if (_remaining > 0)
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{
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int got;
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if (_remaining <= len)
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{
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// data should fit in the buffer
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got = recv(_sock, buffer, _remaining);
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}
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else
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{
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// too much data for the buffer,
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// grab as much as will fit
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got = recv(_sock, buffer, len);
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}
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if (got > 0)
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{
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_remaining -= got;
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return got;
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}
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}
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// If we get here, there's no data available or recv failed
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return -1;
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}
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int EthernetUDP::peek()
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{
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uint8_t b;
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// Unlike recv, peek doesn't check to see if there's any data available, so we must.
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// If the user hasn't called parsePacket yet then return nothing otherwise they
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// may get the UDP header
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if (!_remaining)
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return -1;
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::peek(_sock, &b);
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return b;
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}
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void EthernetUDP::flush()
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{
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// could this fail (loop endlessly) if _remaining > 0 and recv in read fails?
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// should only occur if recv fails after telling us the data is there, lets
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// hope the w5100 always behaves :)
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while (_remaining)
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{
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read();
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}
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}
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