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279 lines
7.1 KiB
279 lines
7.1 KiB
/*
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* Copyright (C) 2006-2016,2020 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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#include "UDPSocket.h"
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#include "Log.h"
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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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CUDPSocket::CUDPSocket(const std::string& address, unsigned int 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("Error from WSAStartup");
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#endif
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}
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CUDPSocket::CUDPSocket(unsigned int 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("Error from WSAStartup");
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#endif
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}
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CUDPSocket::~CUDPSocket()
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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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int CUDPSocket::lookup(const std::string& hostname, unsigned int port, sockaddr_storage& addr, unsigned int& address_length)
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{
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struct addrinfo hints;
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::memset(&hints, 0, sizeof(hints));
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return lookup(hostname, port, addr, address_length, hints);
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}
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int CUDPSocket::lookup(const std::string& hostname, unsigned int port, sockaddr_storage& addr, unsigned int& address_length, struct addrinfo& hints)
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{
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std::string portstr = std::to_string(port);
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struct addrinfo *res;
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/* port is always digits, no needs to lookup service */
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hints.ai_flags |= AI_NUMERICSERV;
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int err = getaddrinfo(hostname.empty() ? NULL : hostname.c_str(), portstr.c_str(), &hints, &res);
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if (err != 0) {
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sockaddr_in* paddr = (sockaddr_in*)&addr;
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::memset(paddr, 0x00U, address_length = sizeof(sockaddr_in));
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paddr->sin_family = AF_INET;
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paddr->sin_port = htons(port);
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paddr->sin_addr.s_addr = htonl(INADDR_NONE);
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LogError("Cannot find address for host %s", hostname.c_str());
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return err;
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}
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::memcpy(&addr, res->ai_addr, address_length = res->ai_addrlen);
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freeaddrinfo(res);
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return 0;
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}
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bool CUDPSocket::match(const sockaddr_storage& addr1, const sockaddr_storage& addr2)
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{
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if (addr1.ss_family != addr2.ss_family)
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return false;
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switch (addr1.ss_family) {
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case AF_INET:
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struct sockaddr_in *in_1, *in_2;
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in_1 = (struct sockaddr_in*)&addr1;
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in_2 = (struct sockaddr_in*)&addr2;
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return ((in_1->sin_addr.s_addr == in_2->sin_addr.s_addr) && (in_1->sin_port == in_2->sin_port));
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case AF_INET6:
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struct sockaddr_in6 *in6_1, *in6_2;
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in6_1 = (struct sockaddr_in6*)&addr1;
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in6_2 = (struct sockaddr_in6*)&addr2;
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return (IN6_ARE_ADDR_EQUAL(&in6_1->sin6_addr, &in6_2->sin6_addr) && (in6_1->sin6_port == in6_2->sin6_port));
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default:
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return false;
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}
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}
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bool CUDPSocket::isnone(const sockaddr_storage& addr)
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{
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struct sockaddr_in *in = (struct sockaddr_in *)&addr;
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return ((addr.ss_family == AF_INET) && (in->sin_addr.s_addr == htonl(INADDR_NONE)));
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}
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bool CUDPSocket::open()
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{
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return open(AF_UNSPEC);
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}
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bool CUDPSocket::open(const unsigned int af)
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{
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sockaddr_storage addr;
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unsigned int addrlen;
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struct addrinfo hints;
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::memset(&hints, 0, sizeof(hints));
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hints.ai_flags = AI_PASSIVE;
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hints.ai_family = af;
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/* to determine protocol family, call lookup() first. */
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int err = lookup(m_address, m_port, addr, addrlen, hints);
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if (err != 0) {
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LogError("The local address is invalid - %s", m_address.c_str());
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return false;
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}
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m_fd = ::socket(addr.ss_family, 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("Cannot create the UDP socket, err: %lu", ::GetLastError());
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#else
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LogError("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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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("Cannot set the UDP socket option, err: %lu", ::GetLastError());
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#else
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LogError("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, addrlen) == -1) {
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#if defined(_WIN32) || defined(_WIN64)
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LogError("Cannot bind the UDP address, err: %lu", ::GetLastError());
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#else
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LogError("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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LogInfo("Opening UDP port on %u", m_port);
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}
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return true;
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}
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int CUDPSocket::read(unsigned char* buffer, unsigned int length, sockaddr_storage& address, unsigned int &address_length)
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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((unsigned int)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("Error returned from UDP select, err: %lu", ::GetLastError());
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#else
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LogError("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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#if defined(_WIN32) || defined(_WIN64)
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int size = sizeof(sockaddr_storage);
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#else
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socklen_t size = sizeof(sockaddr_storage);
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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 *)&address, &size);
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#else
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ssize_t len = ::recvfrom(m_fd, (char*)buffer, length, 0, (sockaddr *)&address, &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("Error returned from recvfrom, err: %lu", ::GetLastError());
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#else
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LogError("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_length = size;
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return len;
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}
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bool CUDPSocket::write(const unsigned char* buffer, unsigned int length, const sockaddr_storage& address, unsigned int address_length)
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{
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assert(buffer != NULL);
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assert(length > 0U);
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#if defined(_WIN32) || defined(_WIN64)
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int ret = ::sendto(m_fd, (char *)buffer, length, 0, (sockaddr *)&address, address_length);
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#else
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ssize_t ret = ::sendto(m_fd, (char *)buffer, length, 0, (sockaddr *)&address, address_length);
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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("Error returned from sendto, err: %lu", ::GetLastError());
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#else
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LogError("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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void CUDPSocket::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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