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etherport.cpp
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etherport.cpp
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/* OpenSprinkler Unified (AVR/RPI/BBB/LINUX) Firmware
* Copyright (C) 2015 by Ray Wang ([email protected])
*
* Linux Ethernet functions
* This file is based on Richard Zimmerman's sprinklers_pi program
* Copyright (c) 2013 Richard Zimmerman
*
* This file is part of the OpenSprinkler library
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*/
#if defined(ARDUINO)
#else
#include "etherport.h"
#include <stdarg.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <string.h>
#include <errno.h>
#include "defines.h"
EthernetServer::EthernetServer(uint16_t port)
: m_port(port), m_sock(0)
{
}
EthernetServer::~EthernetServer()
{
close(m_sock);
}
bool EthernetServer::begin()
{
struct sockaddr_in6 sin = {0};
sin.sin6_family = AF_INET6;
sin.sin6_port = htons(m_port);
sin.sin6_addr = in6addr_any;
if ((m_sock = socket(PF_INET6, SOCK_STREAM, 0)) < 0)
{
DEBUG_PRINTLN("can't create shell listen socket");
return false;
}
int on = 1;
if (setsockopt(m_sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
{
DEBUG_PRINTLN("can't setsockopt SO_REUSEADDR");
return false;
}
int off = 0;
if (setsockopt(m_sock, IPPROTO_IPV6, IPV6_V6ONLY, &off, sizeof(off)) < 0)
{
DEBUG_PRINTLN("can't setsockopt IPV6_V6ONLY");
return false;
}
if (bind(m_sock, (struct sockaddr *) &sin, sizeof(sin)) < 0)
{
DEBUG_PRINTLN("shell bind error");
return false;
}
if (ioctl(m_sock, FIONBIO, (char*) &on) < 0)
{
DEBUG_PRINTLN("setting nonblock failed");
return false;
}
if (listen(m_sock, 2) < 0)
{
DEBUG_PRINTLN("shell listen error");
return false;
}
return true;
}
// This function blocks until we get a client connected.
// It will timeout after 50ms and return a blank client.
// If it succeeds it will return an EthernetClient.
EthernetClient EthernetServer::available()
{
fd_set sock_set;
FD_ZERO(&sock_set);
FD_SET(m_sock, &sock_set);
struct timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = 1000 * 1000; // 1000ms
select(m_sock + 1, &sock_set, NULL, NULL, &timeout);
if (FD_ISSET(m_sock, &sock_set))
{
int client_sock = 0;
struct sockaddr_in6 cli_addr;
unsigned int clilen = sizeof(cli_addr);
if ((client_sock = accept(m_sock, (struct sockaddr *) &cli_addr, &clilen)) <= 0)
return EthernetClient(0);
return EthernetClient(client_sock);
}
return EthernetClient(0);
}
EthernetClient::EthernetClient()
: m_sock(0), m_connected(false)
{
}
EthernetClient::EthernetClient(int sock)
: m_sock(sock), m_connected(true)
{
}
EthernetClient::~EthernetClient()
{
stop();
}
int EthernetClient::connect(uint8_t ip[4], uint16_t port)
{
if (m_sock)
return 0;
struct sockaddr_in sin = {0};
sin.sin_family = AF_INET;
sin.sin_port = htons(port);
sin.sin_addr.s_addr = *(uint32_t*) (ip);
m_sock = socket(AF_INET, SOCK_STREAM, 0);
if (::connect(m_sock, (struct sockaddr *) &sin, sizeof(sin)) < 0)
{
DEBUG_PRINTLN("error connecting to server");
return 0;
}
m_connected = true;
return 1;
}
bool EthernetClient::connected()
{
if (!m_sock)
return false;
int error = 0;
socklen_t len = sizeof(error);
int retval = getsockopt(m_sock, SOL_SOCKET, SO_ERROR, &error, &len);
return (retval == 0) && m_connected;
}
void EthernetClient::stop()
{
if (m_sock)
{
close(m_sock);
m_sock = 0;
m_connected = false;
}
}
EthernetClient::operator bool()
{
return m_sock != 0;
}
// read data from the client into the buffer provided
// This function will block until either data is received OR a timeout happens.
// If an error occurs or a timeout happens, we set the disconnect flag on the socket
// and return 0;
int EthernetClient::read(uint8_t *buf, size_t size)
{
fd_set sock_set;
FD_ZERO(&sock_set);
FD_SET(m_sock, &sock_set);
struct timeval timeout;
timeout.tv_sec = 10;
timeout.tv_usec = 0;
select(m_sock + 1, &sock_set, NULL, NULL, &timeout);
if (FD_ISSET(m_sock, &sock_set))
{
int retval = ::read(m_sock, buf, size);
if (retval <= 0) // socket closed
m_connected = false;
return retval;
}
m_connected = false;
return 0;
}
size_t EthernetClient::write(const uint8_t *buf, size_t size)
{
return ::send(m_sock, buf, size, MSG_NOSIGNAL);
}
#endif