NXDNClients/NXDNReflector/UDPSocket.cpp

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/*
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* Copyright (C) 2006-2016,2020,2021 by Jonathan Naylor G4KLX
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*
* 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 "UDPSocket.h"
#include <cassert>
#if !defined(_WIN32) && !defined(_WIN64)
#include <cerrno>
#include <cstring>
#endif
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#if defined(HAVE_LOG_H)
#include "Log.h"
#else
#define LogMessage(fmt, ...) ::fprintf(stderr, fmt "\n", ## __VA_ARGS__)
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#define LogError(fmt, ...) ::fprintf(stderr, fmt "\n", ## __VA_ARGS__)
#define LogInfo(fmt, ...) ::fprintf(stderr, fmt "\n", ## __VA_ARGS__)
#endif
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CUDPSocket::CUDPSocket(const std::string& address, unsigned short port) :
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m_address_save(address),
m_port_save(port),
m_counter(0U)
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{
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for (int i = 0; i < UDP_SOCKET_MAX; i++) {
m_address[i] = "";
m_port[i] = 0U;
m_af[i] = 0U;
m_fd[i] = -1;
}
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}
CUDPSocket::CUDPSocket(unsigned short port) :
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m_address_save(),
m_port_save(port),
m_counter(0U)
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{
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for (int i = 0; i < UDP_SOCKET_MAX; i++) {
m_address[i] = "";
m_port[i] = 0U;
m_af[i] = 0U;
m_fd[i] = -1;
}
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}
CUDPSocket::~CUDPSocket()
{
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}
void CUDPSocket::startup()
{
#if defined(_WIN32) || defined(_WIN64)
WSAData data;
int wsaRet = ::WSAStartup(MAKEWORD(2, 2), &data);
if (wsaRet != 0)
LogError("Error from WSAStartup");
#endif
}
void CUDPSocket::shutdown()
{
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#if defined(_WIN32) || defined(_WIN64)
::WSACleanup();
#endif
}
int CUDPSocket::lookup(const std::string& hostname, unsigned short port, sockaddr_storage& addr, unsigned int& address_length)
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{
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struct addrinfo hints;
::memset(&hints, 0, sizeof(hints));
return lookup(hostname, port, addr, address_length, hints);
}
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int CUDPSocket::lookup(const std::string& hostname, unsigned short port, sockaddr_storage& addr, unsigned int& address_length, struct addrinfo& hints)
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{
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, address_length = sizeof(sockaddr_in));
paddr->sin_family = AF_INET;
paddr->sin_port = htons(port);
paddr->sin_addr.s_addr = htonl(INADDR_NONE);
LogError("Cannot find address for host %s", hostname.c_str());
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);
return 0;
}
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bool CUDPSocket::match(const sockaddr_storage& addr1, const sockaddr_storage& addr2, IPMATCHTYPE type)
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{
if (addr1.ss_family != addr2.ss_family)
return false;
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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 {
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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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{
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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}
char* CUDPSocket::display(const sockaddr_storage& addr, char* buffer, unsigned int length)
{
assert(buffer != NULL);
assert(length > INET6_ADDRSTRLEN);
switch (addr.ss_family) {
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case AF_INET: {
struct sockaddr_in* in4 = (struct sockaddr_in*)&addr;
::inet_ntop(AF_INET, &in4->sin_addr, buffer, length);
::sprintf(buffer + ::strlen(buffer), ":%u", in4->sin_port);
}
break;
case AF_INET6: {
struct sockaddr_in6* in6 = (struct sockaddr_in6*)&addr;
::inet_ntop(AF_INET6, &in6->sin6_addr, buffer, length);
::sprintf(buffer + ::strlen(buffer), ":%u", in6->sin6_port);
}
break;
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default:
::strcpy(buffer, "Unknown");
break;
}
return buffer;
}
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bool CUDPSocket::open(const sockaddr_storage& address)
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{
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return open(address.ss_family);
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}
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bool CUDPSocket::open(unsigned int af)
{
return open(0, af, m_address_save, m_port_save);
}
bool CUDPSocket::open(const unsigned int index, const unsigned int af, const std::string& address, const unsigned short port)
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{
sockaddr_storage addr;
unsigned int addrlen;
struct addrinfo hints;
::memset(&hints, 0, sizeof(hints));
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hints.ai_flags = AI_PASSIVE;
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hints.ai_family = af;
/* to determine protocol family, call lookup() first. */
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int err = lookup(address, port, addr, addrlen, hints);
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if (err != 0) {
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LogError("The local address is invalid - %s", address.c_str());
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return false;
}
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close(index);
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int fd = ::socket(addr.ss_family, SOCK_DGRAM, 0);
if (fd < 0) {
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#if defined(_WIN32) || defined(_WIN64)
LogError("Cannot create the UDP socket, err: %lu", ::GetLastError());
#else
LogError("Cannot create the UDP socket, err: %d", errno);
#endif
return false;
}
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m_address[index] = address;
m_port[index] = port;
m_af[index] = addr.ss_family;
m_fd[index] = fd;
if (port > 0U) {
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int reuse = 1;
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if (::setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&reuse, sizeof(reuse)) == -1) {
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#if defined(_WIN32) || defined(_WIN64)
LogError("Cannot set the UDP socket option, err: %lu", ::GetLastError());
#else
LogError("Cannot set the UDP socket option, err: %d", errno);
#endif
return false;
}
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if (::bind(fd, (sockaddr*)&addr, addrlen) == -1) {
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#if defined(_WIN32) || defined(_WIN64)
LogError("Cannot bind the UDP address, err: %lu", ::GetLastError());
#else
LogError("Cannot bind the UDP address, err: %d", errno);
#endif
return false;
}
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LogInfo("Opening UDP port on %hu", port);
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}
return true;
}
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int CUDPSocket::read(unsigned char* buffer, unsigned int length, sockaddr_storage& address, unsigned int &address_length)
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{
assert(buffer != NULL);
assert(length > 0U);
// Check that the readfrom() won't block
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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
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#if defined(_WIN32) || defined(_WIN64)
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int ret = WSAPoll(pfd, n, 0);
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#else
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int ret = ::poll(pfd, n, 0);
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#endif
if (ret < 0) {
#if defined(_WIN32) || defined(_WIN64)
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LogError("Error returned from UDP poll, err: %lu", ::GetLastError());
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#else
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LogError("Error returned from UDP poll, err: %d", errno);
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#endif
return -1;
}
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int index;
for (i = 0; i < n; i++) {
// round robin
index = (i + m_counter) % n;
if (pfd[index].revents & POLLIN)
break;
}
if (i == n)
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return 0;
#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
#if defined(_WIN32) || defined(_WIN64)
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int len = ::recvfrom(pfd[index].fd, (char*)buffer, length, 0, (sockaddr *)&address, &size);
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#else
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ssize_t len = ::recvfrom(pfd[index].fd, (char*)buffer, length, 0, (sockaddr *)&address, &size);
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#endif
if (len <= 0) {
#if defined(_WIN32) || defined(_WIN64)
LogError("Error returned from recvfrom, err: %lu", ::GetLastError());
#else
LogError("Error returned from recvfrom, err: %d", errno);
if (len == -1 && errno == ENOTSOCK) {
LogMessage("Re-opening UDP port on %hu", m_port[index]);
close();
open();
}
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#endif
return -1;
}
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m_counter++;
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address_length = size;
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return len;
}
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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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{
assert(buffer != NULL);
assert(length > 0U);
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bool result = false;
for (int i = 0; i < UDP_SOCKET_MAX; i++) {
if (m_fd[i] < 0 || m_af[i] != address.ss_family)
continue;
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#if defined(_WIN32) || defined(_WIN64)
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int ret = ::sendto(m_fd[i], (char *)buffer, length, 0, (sockaddr *)&address, address_length);
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#else
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ssize_t ret = ::sendto(m_fd[i], (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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} else {
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#if defined(_WIN32) || defined(_WIN64)
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if (ret == int(length))
result = true;
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#else
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if (ret == ssize_t(length))
result = true;
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#endif
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}
}
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return result;
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}
void CUDPSocket::close()
{
for (unsigned int i = 0; i < UDP_SOCKET_MAX; i++)
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close(i);
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}
void CUDPSocket::close(const unsigned int index)
{
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if ((index < UDP_SOCKET_MAX) && (m_fd[index] >= 0)) {
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#if defined(_WIN32) || defined(_WIN64)
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::closesocket(m_fd[index]);
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#else
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::close(m_fd[index]);
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#endif
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m_fd[index] = -1;
}
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}