Tom Early
8 years ago
parent
53c0596232
commit
398a4fdb87
@ -0,0 +1,172 @@
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/*
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* Copyright (C) 2006-2016 by Jonathan Naylor G4KLX
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* Copyright (c) 2018 by Thomas A. Early N7TAE
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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 <cassert>
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#include <cstdio>
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#include <cerrno>
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#include <cstring>
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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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}
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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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}
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CUDPSocket::~CUDPSocket()
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{
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}
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in_addr CUDPSocket::lookup(const std::string& hostname)
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{
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in_addr addr;
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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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printf("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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}
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bool CUDPSocket::open() // returns false on error
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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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printf("Cannot create the UDP socket, err: %d", errno);
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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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addr.sin_addr.s_addr = ::inet_addr(m_address.c_str());
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if (addr.sin_addr.s_addr == INADDR_NONE) {
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printf("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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printf("Cannot set the UDP socket option, err: %d", errno);
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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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printf("Cannot bind the UDP address, err: %d", errno);
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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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int CUDPSocket::read(unsigned char* buffer, unsigned int length, in_addr& address, unsigned int& 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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FD_SET(m_fd, &readFds);
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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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printf("Error returned from UDP select, err: %d", errno);
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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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socklen_t size = sizeof(sockaddr_in);
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ssize_t len = ::recvfrom(m_fd, (char*)buffer, length, 0, (sockaddr *)&addr, &size);
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if (len <= 0) {
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printf("Error returned from recvfrom, err: %d", errno);
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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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bool CUDPSocket::write(const unsigned char* buffer, unsigned int length, const in_addr& address, unsigned int 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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ssize_t ret = ::sendto(m_fd, (char *)buffer, length, 0, (sockaddr *)&addr, sizeof(sockaddr_in));
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if (ret < 0) {
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printf("Error returned from sendto, err: %d", errno);
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return false;
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}
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if (ret != ssize_t(length))
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return false;
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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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::close(m_fd);
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}
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@ -0,0 +1,53 @@
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/*
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* Copyright (C) 2009-2011,2013,2015,2016 by Jonathan Naylor G4KLX
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* Copyright (c) 2018 by Thomas A. Early N7TAE
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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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#pragma once
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#include <string>
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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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class CUDPSocket {
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public:
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CUDPSocket(const std::string& address, unsigned int port = 0U);
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CUDPSocket(unsigned int port = 0U);
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~CUDPSocket();
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bool open();
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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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static in_addr lookup(const std::string& hostName);
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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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int m_fd;
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};
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