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81 lines
2.4 KiB
81 lines
2.4 KiB
/*
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* Copyright (C) 2009-2011,2013 by Jonathan Naylor G4KLX
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef UDPReaderWriter_H
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#define UDPReaderWriter_H
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#include "StdCompat.h"
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// Platform socket headers — Winsock on Windows, POSIX on everything else.
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#if defined(_WIN32)
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#pragma comment(lib, "ws2_32.lib")
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#else
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#include <netdb.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#endif
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/*
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* Thin wrapper around a single UDP socket.
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*
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* open() creates and binds a SOCK_DGRAM socket to the configured address and
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* port. read() is non-blocking (uses select() with a zero timeout); write()
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* sends to an explicit destination address supplied by the caller.
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*
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* The static lookup() method resolves a hostname or dotted-decimal string to
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* an in_addr, returning INADDR_NONE on failure.
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*/
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class CUDPReaderWriter {
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public:
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CUDPReaderWriter(const std::string& address, unsigned int port);
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~CUDPReaderWriter();
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// Resolves hostname or dotted-decimal IP string to in_addr.
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// Tries inet_addr() first; falls back to getaddrinfo() for hostnames.
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static in_addr lookup(const std::string& hostName);
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bool open();
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// Returns the number of bytes received, 0 if no datagram was ready, or -1 on error.
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int read(unsigned char* buffer, unsigned int length, in_addr& address, unsigned int& port);
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bool write(const unsigned char* buffer, unsigned int length, const in_addr& address, unsigned int port);
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void close();
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unsigned int getPort() const;
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private:
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std::string m_address;
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unsigned short m_port;
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in_addr m_addr;
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#if defined(_WIN32)
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SOCKET m_fd;
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#else
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int m_fd;
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#endif
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};
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#endif
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