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dvmhost/network/UDPSocket.cpp

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/**
* Digital Voice Modem - Host Software
* GPLv2 Open Source. Use is subject to license terms.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* @package DVM / Host Software
*
*/
//
// Based on code from the MMDVMHost project. (https://github.com/g4klx/MMDVMHost)
// Licensed under the GPLv2 License (https://opensource.org/licenses/GPL-2.0)
//
/*
* Copyright (C) 2006-2016,2020 by Jonathan Naylor G4KLX
* Copyright (C) 2017-2020 by Bryan Biedenkapp N2PLL
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "Defines.h"
#include "network/UDPSocket.h"
#include "Log.h"
#include <cassert>
#if !defined(_WIN32) && !defined(_WIN64)
#include <cerrno>
#include <cstring>
#endif
using namespace network;
// ---------------------------------------------------------------------------
// Public Class Members
// ---------------------------------------------------------------------------
/// <summary>
/// Initializes a new instance of the UDPSocket class.
/// </summary>
/// <param name="address">Hostname/IP address to connect to.</param>
/// <param name="port">Port number.</param>
UDPSocket::UDPSocket(const std::string& address, uint16_t port) :
m_address_save(address),
m_port_save(port),
m_counter(0U)
{
for (int i = 0; i < UDP_SOCKET_MAX; i++) {
m_address[i] = "";
m_port[i] = 0U;
m_af[i] = 0U;
m_fd[i] = -1;
}
}
/// <summary>
/// Initializes a new instance of the UDPSocket class.
/// </summary>
/// <param name="port">Port number.</param>
UDPSocket::UDPSocket(uint16_t port) :
m_address_save(),
m_port_save(port),
m_counter(0U)
{
for (int i = 0; i < UDP_SOCKET_MAX; i++) {
m_address[i] = "";
m_port[i] = 0U;
m_af[i] = 0U;
m_fd[i] = -1;
}
}
/// <summary>
/// Finalizes a instance of the UDPSocket class.
/// </summary>
UDPSocket::~UDPSocket()
{
/* stub */
}
/// <summary>
/// Opens UDP socket connection.
/// </summary>
/// <param name="address"></param>
/// <returns>True, if UDP socket is opened, otherwise false.</returns>
bool UDPSocket::open(const sockaddr_storage& address)
{
return open(address.ss_family);
}
/// <summary>
/// Opens UDP socket connection.
/// </summary>
/// <param name="af"></param>
/// <returns>True, if UDP socket is opened, otherwise false.</returns>
bool UDPSocket::open(uint32_t af)
{
return open(0, af, m_address_save, m_port_save);
}
/// <summary>
/// Opens UDP socket connection.
/// </summary>
/// <param name="index"></param>
/// <param name="af"></param>
/// <param name="address"></param>
/// <param name="port"></param>
/// <returns>True, if UDP socket is opened, otherwise false.</returns>
bool UDPSocket::open(const uint32_t index, const uint32_t af, const std::string& address, const uint16_t port)
{
sockaddr_storage addr;
uint32_t addrlen;
struct addrinfo hints;
::memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_PASSIVE;
hints.ai_family = af;
/* to determine protocol family, call lookup() first. */
int err = lookup(address, port, addr, addrlen, hints);
if (err != 0) {
LogError(LOG_NET, "The local address is invalid - %s", address.c_str());
return false;
}
close(index);
int fd = ::socket(addr.ss_family, SOCK_DGRAM, 0);
if (fd < 0) {
#if defined(_WIN32) || defined(_WIN64)
LogError(LOG_NET, "Cannot create the UDP socket, err: %lu", ::GetLastError());
#else
LogError(LOG_NET, "Cannot create the UDP socket, err: %d", errno);
#endif
return false;
}
m_address[index] = address;
m_port[index] = port;
m_af[index] = addr.ss_family;
m_fd[index] = fd;
if (port > 0U) {
int reuse = 1;
if (::setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char*)& reuse, sizeof(reuse)) == -1) {
#if defined(_WIN32) || defined(_WIN64)
LogError(LOG_NET, "Cannot set the UDP socket option, err: %lu", ::GetLastError());
#else
LogError(LOG_NET, "Cannot set the UDP socket option, err: %d", errno);
#endif
return false;
}
if (::bind(fd, (sockaddr*)& addr, addrlen) == -1) {
#if defined(_WIN32) || defined(_WIN64)
LogError(LOG_NET, "Cannot bind the UDP address, err: %lu", ::GetLastError());
#else
LogError(LOG_NET, "Cannot bind the UDP address, err: %d", errno);
#endif
return false;
}
LogInfoEx(LOG_NET, "Opening UDP port on %u", port);
}
return true;
}
/// <summary>
/// Read data from the UDP socket.
/// </summary>
/// <param name="buffer">Buffer to read data into.</param>
/// <param name="length">Length of data to read.</param>
/// <param name="address">IP address to read data from.</param>
/// <param name="addrLen"></param>
/// <returns>Actual length of data read from remote UDP socket.</returns>
int UDPSocket::read(uint8_t* buffer, uint32_t length, sockaddr_storage& address, uint32_t& addrLen)
{
assert(buffer != nullptr);
assert(length > 0U);
// Check that the readfrom() won't block
int i, n;
struct pollfd pfd[UDP_SOCKET_MAX];
for (i = n = 0; i < UDP_SOCKET_MAX; i++) {
if (m_fd[i] >= 0) {
pfd[n].fd = m_fd[i];
pfd[n].events = POLLIN;
n++;
}
}
// no socket descriptor to receive
if (n == 0)
return 0;
// Return immediately
#if defined(_WIN32) || defined(_WIN64)
int ret = WSAPoll(pfd, n, 0);
#else
int ret = ::poll(pfd, n, 0);
#endif
if (ret < 0) {
#if defined(_WIN32) || defined(_WIN64)
LogError(LOG_NET, "Error returned from UDP poll, err: %lu", ::GetLastError());
#else
LogError(LOG_NET, "Error returned from UDP poll, err: %d", errno);
#endif
return -1;
}
int index;
for (i = 0; i < n; i++) {
// round robin
index = (i + m_counter) % n;
if (pfd[index].revents & POLLIN)
break;
}
if (i == n)
return 0;
#if defined(_WIN32) || defined(_WIN64)
int size = sizeof(sockaddr_storage);
#else
socklen_t size = sizeof(sockaddr_storage);
#endif
#if defined(_WIN32) || defined(_WIN64)
int len = ::recvfrom(pfd[index].fd, (char*)buffer, length, 0, (sockaddr*)& address, &size);
#else
ssize_t len = ::recvfrom(pfd[index].fd, (char*)buffer, length, 0, (sockaddr*)& address, &size);
#endif
if (len <= 0) {
#if defined(_WIN32) || defined(_WIN64)
LogError(LOG_NET, "Error returned from recvfrom, err: %lu", ::GetLastError());
#else
LogError(LOG_NET, "Error returned from recvfrom, err: %d", errno);
if (len == -1 && errno == ENOTSOCK) {
LogMessage(LOG_NET, "Re-opening UDP port on %u", m_port[index]);
close();
open();
}
#endif
return -1;
}
m_counter++;
addrLen = size;
return len;
}
/// <summary>
/// Write data to the UDP socket.
/// </summary>
/// <param name="buffer">Buffer containing data to write to socket.</param>
/// <param name="length">Length of data to write.</param>
/// <param name="address">IP address to write data to.</param>
/// <param name="addrLen"></param>
/// <returns>Actual length of data written to remote UDP socket.</returns>
bool UDPSocket::write(const uint8_t* buffer, uint32_t length, const sockaddr_storage& address, uint32_t addrLen)
{
assert(buffer != nullptr);
assert(length > 0U);
bool result = false;
for (int i = 0; i < UDP_SOCKET_MAX; i++) {
if (m_fd[i] < 0 || m_af[i] != address.ss_family)
continue;
#if defined(_WIN32) || defined(_WIN64)
int ret = ::sendto(m_fd[i], (char*)buffer, length, 0, (sockaddr*)& address, addrLen);
#else
ssize_t ret = ::sendto(m_fd[i], (char*)buffer, length, 0, (sockaddr*)& address, addrLen);
#endif
if (ret < 0) {
#if defined(_WIN32) || defined(_WIN64)
LogError(LOG_NET, "Error returned from sendto, err: %lu", ::GetLastError());
#else
LogError(LOG_NET, "Error returned from sendto, err: %d", errno);
#endif
}
else {
#if defined(_WIN32) || defined(_WIN64)
if (ret == int(length))
result = true;
#else
if (ret == ssize_t(length))
result = true;
#endif
}
}
return result;
}
/// <summary>
/// Closes the UDP socket connection.
/// </summary>
void UDPSocket::close()
{
for (int i = 0; i < UDP_SOCKET_MAX; i++)
close(i);
}
/// <summary>
/// Closes the UDP socket connection.
/// </summary>
/// <param name="index"></param>
void UDPSocket::close(const uint32_t index)
{
if ((index < UDP_SOCKET_MAX) && (m_fd[index] >= 0)) {
#if defined(_WIN32) || defined(_WIN64)
::closesocket(m_fd[index]);
#else
::close(m_fd[index]);
#endif
m_fd[index] = -1;
}
}
/// <summary>
///
/// </summary>
void UDPSocket::startup()
{
#if defined(_WIN32) || defined(_WIN64)
WSAData data;
int wsaRet = ::WSAStartup(MAKEWORD(2, 2), &data);
if (wsaRet != 0) {
LogError(LOG_NET, "Error from WSAStartup");
}
#endif
}
/// <summary>
///
/// </summary>
void UDPSocket::shutdown()
{
#if defined(_WIN32) || defined(_WIN64)
::WSACleanup();
#endif
}
/// <summary>
/// Helper to lookup a hostname and resolve it to an IP address.
/// </summary>
/// <param name="hostname">String containing hostname to resolve.</param>
/// <param name="port">Numeric port number of service to resolve.</param>
/// <param name="addr">Socket address structure.</param>
/// <param name="addrLen"></param>
/// <returns>Zero if no error during lookup, otherwise error.</returns>
int UDPSocket::lookup(const std::string& hostname, uint16_t port, sockaddr_storage& addr, uint32_t& addrLen)
{
struct addrinfo hints;
::memset(&hints, 0, sizeof(hints));
return lookup(hostname, port, addr, addrLen, hints);
}
/// <summary>
/// Helper to lookup a hostname and resolve it to an IP address.
/// </summary>
/// <param name="hostname">String containing hostname to resolve.</param>
/// <param name="port">Numeric port number of service to resolve.</param>
/// <param name="addr">Socket address structure.</param>
/// <param name="addrLen"></param>
/// <param name="hints"></param>
/// <returns>Zero if no error during lookup, otherwise error.</returns>
int UDPSocket::lookup(const std::string& hostname, uint16_t port, sockaddr_storage& addr, uint32_t& addrLen, struct addrinfo& hints)
{
std::string portstr = std::to_string(port);
struct addrinfo* res;
// port is always digits, no needs to lookup service
hints.ai_flags |= AI_NUMERICSERV;
int err = getaddrinfo(hostname.empty() ? NULL : hostname.c_str(), portstr.c_str(), &hints, &res);
if (err != 0) {
sockaddr_in* paddr = (sockaddr_in*)& addr;
::memset(paddr, 0x00U, addrLen = sizeof(sockaddr_in));
paddr->sin_family = AF_INET;
paddr->sin_port = htons(port);
paddr->sin_addr.s_addr = htonl(INADDR_NONE);
LogError(LOG_NET, "Cannot find address for host %s", hostname.c_str());
return err;
}
::memcpy(&addr, res->ai_addr, addrLen = res->ai_addrlen);
freeaddrinfo(res);
return 0;
}
/// <summary>
///
/// </summary>
/// <param name="addr1"></param>
/// <param name="addr2"></param>
/// <param name="type"></param>
/// <returns></returns>
bool UDPSocket::match(const sockaddr_storage& addr1, const sockaddr_storage& addr2, IPMATCHTYPE type)
{
if (addr1.ss_family != addr2.ss_family)
return false;
if (type == IMT_ADDRESS_AND_PORT) {
switch (addr1.ss_family) {
case AF_INET:
struct sockaddr_in* in_1, * in_2;
in_1 = (struct sockaddr_in*) & addr1;
in_2 = (struct sockaddr_in*) & addr2;
return (in_1->sin_addr.s_addr == in_2->sin_addr.s_addr) && (in_1->sin_port == in_2->sin_port);
case AF_INET6:
struct sockaddr_in6* in6_1, *in6_2;
in6_1 = (struct sockaddr_in6*) & addr1;
in6_2 = (struct sockaddr_in6*) & addr2;
return IN6_ARE_ADDR_EQUAL(&in6_1->sin6_addr, &in6_2->sin6_addr) && (in6_1->sin6_port == in6_2->sin6_port);
default:
return false;
}
}
else if (type == IMT_ADDRESS_ONLY) {
switch (addr1.ss_family) {
case AF_INET:
struct sockaddr_in* in_1, * in_2;
in_1 = (struct sockaddr_in*) & addr1;
in_2 = (struct sockaddr_in*) & addr2;
return in_1->sin_addr.s_addr == in_2->sin_addr.s_addr;
case AF_INET6:
struct sockaddr_in6* in6_1, * in6_2;
in6_1 = (struct sockaddr_in6*) & addr1;
in6_2 = (struct sockaddr_in6*) & addr2;
return IN6_ARE_ADDR_EQUAL(&in6_1->sin6_addr, &in6_2->sin6_addr);
default:
return false;
}
}
else {
return false;
}
}
/// <summary>
///
/// </summary>
/// <param name="addr"></param>
/// <returns></returns>
std::string UDPSocket::address(const sockaddr_storage& addr)
{
std::string address = std::string();
char str[INET_ADDRSTRLEN];
switch (addr.ss_family) {
case AF_INET:
{
struct sockaddr_in* in;
in = (struct sockaddr_in*) & addr;
inet_ntop(AF_INET, &(in->sin_addr), str, INET_ADDRSTRLEN);
address = std::string(str);
}
break;
case AF_INET6:
{
struct sockaddr_in6* in6;
in6 = (struct sockaddr_in6*) & addr;
inet_ntop(AF_INET6, &(in6->sin6_addr), str, INET_ADDRSTRLEN);
address = std::string(str);
}
break;
default:
break;
}
return address;
}
/// <summary>
///
/// </summary>
/// <param name="addr"></param>
/// <returns></returns>
bool UDPSocket::isNone(const sockaddr_storage& addr)
{
struct sockaddr_in* in = (struct sockaddr_in*) & addr;
return ((addr.ss_family == AF_INET) && (in->sin_addr.s_addr == htonl(INADDR_NONE)));
}
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