mirror of
https://github.com/ShaYmez/NXDNClients.git
synced 2024-11-22 23:38:37 -05:00
292 lines
6.8 KiB
C++
292 lines
6.8 KiB
C++
/*
|
|
* Copyright (C) 2006-2016,2020 by Jonathan Naylor G4KLX
|
|
*
|
|
* 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 "Log.h"
|
|
|
|
#include <cassert>
|
|
|
|
#if !defined(_WIN32) && !defined(_WIN64)
|
|
#include <cerrno>
|
|
#include <cstring>
|
|
#include <ifaddrs.h>
|
|
#endif
|
|
|
|
|
|
CUDPSocket::CUDPSocket(const std::string& address, unsigned int port) :
|
|
m_address(address),
|
|
m_port(port),
|
|
m_fd(-1)
|
|
{
|
|
assert(!address.empty());
|
|
|
|
#if defined(_WIN32) || defined(_WIN64)
|
|
WSAData data;
|
|
int wsaRet = ::WSAStartup(MAKEWORD(2, 2), &data);
|
|
if (wsaRet != 0)
|
|
LogError("Error from WSAStartup");
|
|
#endif
|
|
}
|
|
|
|
CUDPSocket::CUDPSocket(unsigned int port) :
|
|
m_address(),
|
|
m_port(port),
|
|
m_fd(-1)
|
|
{
|
|
#if defined(_WIN32) || defined(_WIN64)
|
|
WSAData data;
|
|
int wsaRet = ::WSAStartup(MAKEWORD(2, 2), &data);
|
|
if (wsaRet != 0)
|
|
LogError("Error from WSAStartup");
|
|
#endif
|
|
}
|
|
|
|
CUDPSocket::~CUDPSocket()
|
|
{
|
|
#if defined(_WIN32) || defined(_WIN64)
|
|
::WSACleanup();
|
|
#endif
|
|
}
|
|
|
|
in_addr CUDPSocket::lookup(const std::string& hostname)
|
|
{
|
|
in_addr addr;
|
|
#if defined(_WIN32) || defined(_WIN64)
|
|
unsigned long address = ::inet_addr(hostname.c_str());
|
|
if (address != INADDR_NONE && address != INADDR_ANY) {
|
|
addr.s_addr = address;
|
|
return addr;
|
|
}
|
|
|
|
struct hostent* hp = ::gethostbyname(hostname.c_str());
|
|
if (hp != NULL) {
|
|
::memcpy(&addr, hp->h_addr_list[0], sizeof(struct in_addr));
|
|
return addr;
|
|
}
|
|
|
|
LogError("Cannot find address for host %s", hostname.c_str());
|
|
|
|
addr.s_addr = INADDR_NONE;
|
|
return addr;
|
|
#else
|
|
in_addr_t address = ::inet_addr(hostname.c_str());
|
|
if (address != in_addr_t(-1)) {
|
|
addr.s_addr = address;
|
|
return addr;
|
|
}
|
|
|
|
struct hostent* hp = ::gethostbyname(hostname.c_str());
|
|
if (hp != NULL) {
|
|
::memcpy(&addr, hp->h_addr_list[0], sizeof(struct in_addr));
|
|
return addr;
|
|
}
|
|
|
|
LogError("Cannot find address for host %s", hostname.c_str());
|
|
|
|
addr.s_addr = INADDR_NONE;
|
|
return addr;
|
|
#endif
|
|
}
|
|
|
|
bool CUDPSocket::open()
|
|
{
|
|
m_fd = ::socket(PF_INET, SOCK_DGRAM, 0);
|
|
if (m_fd < 0) {
|
|
#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;
|
|
}
|
|
|
|
if (m_port > 0U) {
|
|
sockaddr_in addr;
|
|
::memset(&addr, 0x00, sizeof(sockaddr_in));
|
|
addr.sin_family = AF_INET;
|
|
addr.sin_port = htons(m_port);
|
|
addr.sin_addr.s_addr = htonl(INADDR_ANY);
|
|
|
|
if (!m_address.empty()) {
|
|
#if defined(_WIN32) || defined(_WIN64)
|
|
addr.sin_addr.s_addr = ::inet_addr(m_address.c_str());
|
|
#else
|
|
addr.sin_addr.s_addr = ::inet_addr(m_address.c_str());
|
|
#endif
|
|
if (addr.sin_addr.s_addr == INADDR_NONE) {
|
|
LogError("The local address is invalid - %s", m_address.c_str());
|
|
return false;
|
|
}
|
|
}
|
|
|
|
int reuse = 1;
|
|
if (::setsockopt(m_fd, SOL_SOCKET, SO_REUSEADDR, (char *)&reuse, sizeof(reuse)) == -1) {
|
|
#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;
|
|
}
|
|
|
|
if (::bind(m_fd, (sockaddr*)&addr, sizeof(sockaddr_in)) == -1) {
|
|
#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;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
int CUDPSocket::read(unsigned char* buffer, unsigned int length, in_addr& address, unsigned int& port)
|
|
{
|
|
assert(buffer != NULL);
|
|
assert(length > 0U);
|
|
|
|
// Check that the readfrom() won't block
|
|
fd_set readFds;
|
|
FD_ZERO(&readFds);
|
|
#if defined(_WIN32) || defined(_WIN64)
|
|
FD_SET((unsigned int)m_fd, &readFds);
|
|
#else
|
|
FD_SET(m_fd, &readFds);
|
|
#endif
|
|
|
|
// Return immediately
|
|
timeval tv;
|
|
tv.tv_sec = 0L;
|
|
tv.tv_usec = 0L;
|
|
|
|
int ret = ::select(m_fd + 1, &readFds, NULL, NULL, &tv);
|
|
if (ret < 0) {
|
|
#if defined(_WIN32) || defined(_WIN64)
|
|
LogError("Error returned from UDP select, err: %lu", ::GetLastError());
|
|
#else
|
|
LogError("Error returned from UDP select, err: %d", errno);
|
|
#endif
|
|
return -1;
|
|
}
|
|
|
|
if (ret == 0)
|
|
return 0;
|
|
|
|
sockaddr_in addr;
|
|
#if defined(_WIN32) || defined(_WIN64)
|
|
int size = sizeof(sockaddr_in);
|
|
#else
|
|
socklen_t size = sizeof(sockaddr_in);
|
|
#endif
|
|
|
|
#if defined(_WIN32) || defined(_WIN64)
|
|
int len = ::recvfrom(m_fd, (char*)buffer, length, 0, (sockaddr *)&addr, &size);
|
|
#else
|
|
ssize_t len = ::recvfrom(m_fd, (char*)buffer, length, 0, (sockaddr *)&addr, &size);
|
|
#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);
|
|
#endif
|
|
return -1;
|
|
}
|
|
|
|
address = addr.sin_addr;
|
|
port = ntohs(addr.sin_port);
|
|
|
|
return len;
|
|
}
|
|
|
|
bool CUDPSocket::write(const unsigned char* buffer, unsigned int length, const in_addr& address, unsigned int port)
|
|
{
|
|
assert(buffer != NULL);
|
|
assert(length > 0U);
|
|
|
|
sockaddr_in addr;
|
|
::memset(&addr, 0x00, sizeof(sockaddr_in));
|
|
|
|
addr.sin_family = AF_INET;
|
|
addr.sin_addr = address;
|
|
addr.sin_port = htons(port);
|
|
|
|
#if defined(_WIN32) || defined(_WIN64)
|
|
int ret = ::sendto(m_fd, (char *)buffer, length, 0, (sockaddr *)&addr, sizeof(sockaddr_in));
|
|
#else
|
|
ssize_t ret = ::sendto(m_fd, (char *)buffer, length, 0, (sockaddr *)&addr, sizeof(sockaddr_in));
|
|
#endif
|
|
if (ret < 0) {
|
|
#if defined(_WIN32) || defined(_WIN64)
|
|
LogError("Error returned from sendto, err: %lu", ::GetLastError());
|
|
#else
|
|
LogError("Error returned from sendto, err: %d", errno);
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
#if defined(_WIN32) || defined(_WIN64)
|
|
if (ret != int(length))
|
|
return false;
|
|
#else
|
|
if (ret != ssize_t(length))
|
|
return false;
|
|
#endif
|
|
|
|
return true;
|
|
}
|
|
|
|
void CUDPSocket::close()
|
|
{
|
|
#if defined(_WIN32) || defined(_WIN64)
|
|
::closesocket(m_fd);
|
|
#else
|
|
::close(m_fd);
|
|
#endif
|
|
}
|
|
|
|
unsigned long CUDPSocket::getLocalAddress() const
|
|
{
|
|
unsigned long address = 0UL;
|
|
|
|
char hostname[80U];
|
|
int ret = ::gethostname(hostname, 80);
|
|
if (ret == -1)
|
|
return 0UL;
|
|
|
|
struct hostent* phe = ::gethostbyname(hostname);
|
|
if (phe == NULL)
|
|
return 0UL;
|
|
|
|
if (phe->h_addrtype != AF_INET)
|
|
return 0UL;
|
|
|
|
for (unsigned int i = 0U; phe->h_addr_list[i] != NULL; i++) {
|
|
struct in_addr addr;
|
|
::memcpy(&addr, phe->h_addr_list[i], sizeof(struct in_addr));
|
|
if (addr.s_addr != INADDR_LOOPBACK) {
|
|
address = addr.s_addr;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return address;
|
|
}
|