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Arduino-Development / libraries /Ethernet /src /EthernetClient.cpp
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Archive original Arduino development files (part 8)
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/* Copyright 2018 Paul Stoffregen
*
* 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.
*/
#include <Arduino.h>
#include "Ethernet.h"
#include "Dns.h"
#include "utility/w5100.h"
int EthernetClient::connect(const char * host, uint16_t port)
{
DNSClient dns; // Look up the host first
IPAddress remote_addr;
if (sockindex < MAX_SOCK_NUM) {
if (Ethernet.socketStatus(sockindex) != SnSR::CLOSED) {
Ethernet.socketDisconnect(sockindex); // TODO: should we call stop()?
}
sockindex = MAX_SOCK_NUM;
}
dns.begin(Ethernet.dnsServerIP());
if (!dns.getHostByName(host, remote_addr)) return 0; // TODO: use _timeout
return connect(remote_addr, port);
}
int EthernetClient::connect(IPAddress ip, uint16_t port)
{
if (sockindex < MAX_SOCK_NUM) {
if (Ethernet.socketStatus(sockindex) != SnSR::CLOSED) {
Ethernet.socketDisconnect(sockindex); // TODO: should we call stop()?
}
sockindex = MAX_SOCK_NUM;
}
#if defined(ESP8266) || defined(ESP32)
if (ip == IPAddress((uint32_t)0) || ip == IPAddress(0xFFFFFFFFul)) return 0;
#else
if (ip == IPAddress(0ul) || ip == IPAddress(0xFFFFFFFFul)) return 0;
#endif
sockindex = Ethernet.socketBegin(SnMR::TCP, 0);
if (sockindex >= MAX_SOCK_NUM) return 0;
Ethernet.socketConnect(sockindex, rawIPAddress(ip), port);
uint32_t start = millis();
while (1) {
uint8_t stat = Ethernet.socketStatus(sockindex);
if (stat == SnSR::ESTABLISHED) return 1;
if (stat == SnSR::CLOSE_WAIT) return 1;
if (stat == SnSR::CLOSED) return 0;
if (millis() - start > _timeout) break;
delay(1);
}
Ethernet.socketClose(sockindex);
sockindex = MAX_SOCK_NUM;
return 0;
}
int EthernetClient::availableForWrite(void)
{
if (sockindex >= MAX_SOCK_NUM) return 0;
return Ethernet.socketSendAvailable(sockindex);
}
size_t EthernetClient::write(uint8_t b)
{
return write(&b, 1);
}
size_t EthernetClient::write(const uint8_t *buf, size_t size)
{
if (sockindex >= MAX_SOCK_NUM) return 0;
if (Ethernet.socketSend(sockindex, buf, size)) return size;
setWriteError();
return 0;
}
int EthernetClient::available()
{
if (sockindex >= MAX_SOCK_NUM) return 0;
return Ethernet.socketRecvAvailable(sockindex);
// TODO: do the Wiznet chips automatically retransmit TCP ACK
// packets if they are lost by the network? Someday this should
// be checked by a man-in-the-middle test which discards certain
// packets. If ACKs aren't resent, we would need to check for
// returning 0 here and after a timeout do another Sock_RECV
// command to cause the Wiznet chip to resend the ACK packet.
}
int EthernetClient::read(uint8_t *buf, size_t size)
{
if (sockindex >= MAX_SOCK_NUM) return 0;
return Ethernet.socketRecv(sockindex, buf, size);
}
int EthernetClient::peek()
{
if (sockindex >= MAX_SOCK_NUM) return -1;
if (!available()) return -1;
return Ethernet.socketPeek(sockindex);
}
int EthernetClient::read()
{
uint8_t b;
if (Ethernet.socketRecv(sockindex, &b, 1) > 0) return b;
return -1;
}
void EthernetClient::flush()
{
while (sockindex < MAX_SOCK_NUM) {
uint8_t stat = Ethernet.socketStatus(sockindex);
if (stat != SnSR::ESTABLISHED && stat != SnSR::CLOSE_WAIT) return;
if (Ethernet.socketSendAvailable(sockindex) >= W5100.SSIZE) return;
}
}
void EthernetClient::stop()
{
if (sockindex >= MAX_SOCK_NUM) return;
// attempt to close the connection gracefully (send a FIN to other side)
Ethernet.socketDisconnect(sockindex);
unsigned long start = millis();
// wait up to a second for the connection to close
do {
if (Ethernet.socketStatus(sockindex) == SnSR::CLOSED) {
sockindex = MAX_SOCK_NUM;
return; // exit the loop
}
delay(1);
} while (millis() - start < _timeout);
// if it hasn't closed, close it forcefully
Ethernet.socketClose(sockindex);
sockindex = MAX_SOCK_NUM;
}
uint8_t EthernetClient::connected()
{
if (sockindex >= MAX_SOCK_NUM) return 0;
uint8_t s = Ethernet.socketStatus(sockindex);
return !(s == SnSR::LISTEN || s == SnSR::CLOSED || s == SnSR::FIN_WAIT ||
(s == SnSR::CLOSE_WAIT && !available()));
}
uint8_t EthernetClient::status()
{
if (sockindex >= MAX_SOCK_NUM) return SnSR::CLOSED;
return Ethernet.socketStatus(sockindex);
}
// the next function allows us to use the client returned by
// EthernetServer::available() as the condition in an if-statement.
bool EthernetClient::operator==(const EthernetClient& rhs)
{
if (sockindex != rhs.sockindex) return false;
if (sockindex >= MAX_SOCK_NUM) return false;
if (rhs.sockindex >= MAX_SOCK_NUM) return false;
return true;
}
// https://github.com/per1234/EthernetMod
// from: https://github.com/ntruchsess/Arduino-1/commit/937bce1a0bb2567f6d03b15df79525569377dabd
uint16_t EthernetClient::localPort()
{
if (sockindex >= MAX_SOCK_NUM) return 0;
uint16_t port;
SPI.beginTransaction(SPI_ETHERNET_SETTINGS);
port = W5100.readSnPORT(sockindex);
SPI.endTransaction();
return port;
}
// https://github.com/per1234/EthernetMod
// returns the remote IP address: http://forum.arduino.cc/index.php?topic=82416.0
IPAddress EthernetClient::remoteIP()
{
if (sockindex >= MAX_SOCK_NUM) return IPAddress((uint32_t)0);
uint8_t remoteIParray[4];
SPI.beginTransaction(SPI_ETHERNET_SETTINGS);
W5100.readSnDIPR(sockindex, remoteIParray);
SPI.endTransaction();
return IPAddress(remoteIParray);
}
// https://github.com/per1234/EthernetMod
// from: https://github.com/ntruchsess/Arduino-1/commit/ca37de4ba4ecbdb941f14ac1fe7dd40f3008af75
uint16_t EthernetClient::remotePort()
{
if (sockindex >= MAX_SOCK_NUM) return 0;
uint16_t port;
SPI.beginTransaction(SPI_ETHERNET_SETTINGS);
port = W5100.readSnDPORT(sockindex);
SPI.endTransaction();
return port;
}