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319 lines
9.1 KiB
319 lines
9.1 KiB
/**
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* Digital Voice Modem - Host Software
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* GPLv2 Open Source. Use is subject to license terms.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* @package DVM / Host Software
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*
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*/
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//
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// Based on code from the MMDVMHost project. (https://github.com/g4klx/MMDVMHost)
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// Licensed under the GPLv2 License (https://opensource.org/licenses/GPL-2.0)
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//
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/*
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* Copyright (C) 2006-2016 by Jonathan Naylor G4KLX
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* Copyright (C) 2017-2020 by Bryan Biedenkapp N2PLL
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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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#include "Defines.h"
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#include "network/UDPSocket.h"
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#include "Log.h"
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using namespace network;
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#include <cassert>
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#if !defined(_WIN32) && !defined(_WIN64)
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#include <cerrno>
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#include <cstring>
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#endif
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// ---------------------------------------------------------------------------
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// Public Class Members
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// ---------------------------------------------------------------------------
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/// <summary>
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/// Initializes a new instance of the UDPSocket class.
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/// </summary>
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/// <param name="address">Hostname/IP address to connect to.</param>
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/// <param name="port">Port number.</param>
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UDPSocket::UDPSocket(const std::string& address, uint32_t port) :
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m_address(address),
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m_port(port),
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m_fd(-1)
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{
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assert(!address.empty());
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#if defined(_WIN32) || defined(_WIN64)
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WSAData data;
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int wsaRet = ::WSAStartup(MAKEWORD(2, 2), &data);
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if (wsaRet != 0)
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LogError(LOG_NET, "Error from WSAStartup");
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#endif
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}
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/// <summary>
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/// Initializes a new instance of the UDPSocket class.
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/// </summary>
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/// <param name="port">Port number.</param>
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UDPSocket::UDPSocket(uint32_t port) :
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m_address(),
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m_port(port),
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m_fd(-1)
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{
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#if defined(_WIN32) || defined(_WIN64)
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WSAData data;
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int wsaRet = ::WSAStartup(MAKEWORD(2, 2), &data);
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if (wsaRet != 0)
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LogError(LOG_NET, "Error from WSAStartup");
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#endif
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}
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/// <summary>
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/// Finalizes a instance of the UDPSocket class.
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/// </summary>
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UDPSocket::~UDPSocket()
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{
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#if defined(_WIN32) || defined(_WIN64)
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::WSACleanup();
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#endif
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}
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/// <summary>
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/// Opens UDP socket connection.
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/// </summary>
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/// <returns>True, if UDP socket is opened, otherwise false.</returns>
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bool UDPSocket::open()
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{
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m_fd = ::socket(PF_INET, SOCK_DGRAM, 0);
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if (m_fd < 0) {
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#if defined(_WIN32) || defined(_WIN64)
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LogError(LOG_NET, "Cannot create the UDP socket, err: %lu", ::GetLastError());
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#else
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LogError(LOG_NET, "Cannot create the UDP socket, err: %d", errno);
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#endif
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return false;
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}
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if (m_port > 0U) {
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sockaddr_in addr;
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::memset(&addr, 0x00, sizeof(sockaddr_in));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(m_port);
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addr.sin_addr.s_addr = htonl(INADDR_ANY);
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if (!m_address.empty()) {
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#if defined(_WIN32) || defined(_WIN64)
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addr.sin_addr.s_addr = ::inet_addr(m_address.c_str());
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#else
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addr.sin_addr.s_addr = ::inet_addr(m_address.c_str());
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#endif
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if (addr.sin_addr.s_addr == INADDR_NONE) {
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LogError(LOG_NET, "The local address is invalid - %s", m_address.c_str());
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return false;
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}
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}
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int reuse = 1;
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if (::setsockopt(m_fd, SOL_SOCKET, SO_REUSEADDR, (char *)&reuse, sizeof(reuse)) == -1) {
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#if defined(_WIN32) || defined(_WIN64)
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LogError(LOG_NET, "Cannot set the UDP socket option, err: %lu", ::GetLastError());
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#else
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LogError(LOG_NET, "Cannot set the UDP socket option, err: %d", errno);
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#endif
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return false;
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}
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if (::bind(m_fd, (sockaddr*)&addr, sizeof(sockaddr_in)) == -1) {
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#if defined(_WIN32) || defined(_WIN64)
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LogError(LOG_NET, "Cannot bind the UDP address, err: %lu", ::GetLastError());
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#else
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LogError(LOG_NET, "Cannot bind the UDP address, err: %d", errno);
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#endif
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return false;
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}
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}
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return true;
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}
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/// <summary>
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/// Read data from the UDP socket.
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/// </summary>
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/// <param name="buffer">Buffer to read data into.</param>
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/// <param name="length">Length of data to read.</param>
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/// <param name="address">IP address to read data from.</param>
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/// <param name="port">Port number for remote UDP socket.</param>
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/// <returns>Actual length of data read from remote UDP socket.</returns>
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int UDPSocket::read(uint8_t* buffer, uint32_t length, in_addr& address, uint32_t& port)
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{
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assert(buffer != NULL);
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assert(length > 0U);
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// Check that the readfrom() won't block
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fd_set readFds;
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FD_ZERO(&readFds);
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#if defined(_WIN32) || defined(_WIN64)
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FD_SET((uint32_t)m_fd, &readFds);
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#else
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FD_SET(m_fd, &readFds);
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#endif
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// Return immediately
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timeval tv;
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tv.tv_sec = 0L;
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tv.tv_usec = 0L;
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int ret = ::select(m_fd + 1, &readFds, NULL, NULL, &tv);
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if (ret < 0) {
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#if defined(_WIN32) || defined(_WIN64)
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LogError(LOG_NET, "Error returned from UDP select, err: %lu", ::GetLastError());
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#else
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LogError(LOG_NET, "Error returned from UDP select, err: %d", errno);
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#endif
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return -1;
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}
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if (ret == 0)
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return 0;
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sockaddr_in addr;
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#if defined(_WIN32) || defined(_WIN64)
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int size = sizeof(sockaddr_in);
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#else
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socklen_t size = sizeof(sockaddr_in);
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#endif
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#if defined(_WIN32) || defined(_WIN64)
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int len = ::recvfrom(m_fd, (char*)buffer, length, 0, (sockaddr *)&addr, &size);
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#else
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ssize_t len = ::recvfrom(m_fd, (char*)buffer, length, 0, (sockaddr *)&addr, &size);
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#endif
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if (len <= 0) {
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#if defined(_WIN32) || defined(_WIN64)
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LogError(LOG_NET, "Error returned from recvfrom, err: %lu", ::GetLastError());
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#else
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LogError(LOG_NET, "Error returned from recvfrom, err: %d", errno);
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#endif
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return -1;
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}
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address = addr.sin_addr;
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port = ntohs(addr.sin_port);
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return len;
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}
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/// <summary>
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/// Write data to the UDP socket.
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/// </summary>
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/// <param name="buffer">Buffer containing data to write to socket.</param>
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/// <param name="length">Length of data to write.</param>
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/// <param name="address">IP address to write data to.</param>
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/// <param name="port">Port number for remote UDP socket.</param>
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/// <returns>Actual length of data written to remote UDP socket.</returns>
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bool UDPSocket::write(const uint8_t* buffer, uint32_t length, const in_addr& address, uint32_t port)
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{
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assert(buffer != NULL);
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assert(length > 0U);
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sockaddr_in addr;
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::memset(&addr, 0x00, sizeof(sockaddr_in));
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addr.sin_family = AF_INET;
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addr.sin_addr = address;
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addr.sin_port = htons(port);
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#if defined(_WIN32) || defined(_WIN64)
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int ret = ::sendto(m_fd, (char *)buffer, length, 0, (sockaddr *)&addr, sizeof(sockaddr_in));
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#else
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ssize_t ret = ::sendto(m_fd, (char *)buffer, length, 0, (sockaddr *)&addr, sizeof(sockaddr_in));
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#endif
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if (ret < 0) {
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#if defined(_WIN32) || defined(_WIN64)
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LogError(LOG_NET, "Error returned from sendto, err: %lu", ::GetLastError());
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#else
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LogError(LOG_NET, "Error returned from sendto, err: %d", errno);
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#endif
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return false;
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}
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#if defined(_WIN32) || defined(_WIN64)
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if (ret != int(length))
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return false;
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#else
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if (ret != ssize_t(length))
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return false;
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#endif
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return true;
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}
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/// <summary>
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/// Closes the UDP socket connection.
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/// </summary>
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void UDPSocket::close()
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{
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#if defined(_WIN32) || defined(_WIN64)
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::closesocket(m_fd);
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#else
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::close(m_fd);
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#endif
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}
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/// <summary>
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/// Helper to lookup a hostname and resolve it to an IP address.
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/// </summary>
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/// <param name="hostname">String containing hostname to resolve.</param>
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/// <returns>IP address structure for containing resolved hostname.</returns>
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in_addr UDPSocket::lookup(const std::string& hostname)
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{
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in_addr addr;
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#if defined(_WIN32) || defined(_WIN64)
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unsigned long address = ::inet_addr(hostname.c_str());
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if (address != INADDR_NONE && address != INADDR_ANY) {
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addr.s_addr = address;
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return addr;
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}
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struct hostent* hp = ::gethostbyname(hostname.c_str());
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if (hp != NULL) {
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::memcpy(&addr, hp->h_addr_list[0], sizeof(struct in_addr));
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return addr;
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}
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LogError(LOG_NET, "Cannot find address for host %s", hostname.c_str());
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addr.s_addr = INADDR_NONE;
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return addr;
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#else
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in_addr_t address = ::inet_addr(hostname.c_str());
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if (address != in_addr_t(-1)) {
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addr.s_addr = address;
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return addr;
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}
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struct hostent* hp = ::gethostbyname(hostname.c_str());
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if (hp != NULL) {
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::memcpy(&addr, hp->h_addr_list[0], sizeof(struct in_addr));
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return addr;
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}
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LogError(LOG_NET, "Cannot find address for host %s", hostname.c_str());
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addr.s_addr = INADDR_NONE;
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return addr;
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#endif
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}
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