NXDNClients/NXDNGateway/TCPSocket.cpp
2018-05-22 20:43:04 +01:00

233 lines
5.4 KiB
C++

/*
* Copyright (C) 2010-2013,2016 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 "TCPSocket.h"
#include "UDPSocket.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
#include <cstring>
#if defined(_WIN32) || defined(_WIN64)
typedef int ssize_t;
#else
#include <cerrno>
#endif
CTCPSocket::CTCPSocket(const std::string& address, unsigned int port) :
m_address(address),
m_port(port),
m_fd(-1)
{
assert(!address.empty());
assert(port > 0U);
#if defined(_WIN32) || defined(_WIN64)
WSAData data;
int wsaRet = ::WSAStartup(MAKEWORD(2, 2), &data);
if (wsaRet != 0)
LogError("Error from WSAStartup");
#endif
}
CTCPSocket::~CTCPSocket()
{
#if defined(_WIN32) || defined(_WIN64)
::WSACleanup();
#endif
}
bool CTCPSocket::open()
{
if (m_fd != -1)
return true;
if (m_address.empty() || m_port == 0U)
return false;
m_fd = ::socket(PF_INET, SOCK_STREAM, 0);
if (m_fd < 0) {
#if defined(_WIN32) || defined(_WIN64)
LogError("Cannot create the TCP client socket, err=%d", ::GetLastError());
#else
LogError("Cannot create the TCP client socket, err=%d", errno);
#endif
return false;
}
struct sockaddr_in addr;
::memset(&addr, 0x00, sizeof(struct sockaddr_in));
addr.sin_family = AF_INET;
addr.sin_port = htons(m_port);
addr.sin_addr = CUDPSocket::lookup(m_address);
if (addr.sin_addr.s_addr == INADDR_NONE) {
close();
return false;
}
if (::connect(m_fd, (sockaddr*)&addr, sizeof(struct sockaddr_in)) == -1) {
#if defined(_WIN32) || defined(_WIN64)
LogError("Cannot connect the TCP client socket, err=%d", ::GetLastError());
#else
LogError("Cannot connect the TCP client socket, err=%d", errno);
#endif
close();
return false;
}
int noDelay = 1;
if (::setsockopt(m_fd, IPPROTO_TCP, TCP_NODELAY, (char *)&noDelay, sizeof(noDelay)) == -1) {
#if defined(_WIN32) || defined(_WIN64)
LogError("Cannot set the TCP client socket option, err=%d", ::GetLastError());
#else
LogError("Cannot set the TCP client socket option, err=%d", errno);
#endif
close();
return false;
}
return true;
}
int CTCPSocket::read(unsigned char* buffer, unsigned int length, unsigned int secs, unsigned int msecs)
{
assert(buffer != NULL);
assert(length > 0U);
assert(m_fd != -1);
// Check that the recv() 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 after timeout
timeval tv;
tv.tv_sec = secs;
tv.tv_usec = msecs * 1000;
int ret = ::select(m_fd + 1, &readFds, NULL, NULL, &tv);
if (ret < 0) {
#if defined(_WIN32) || defined(_WIN64)
LogError("Error returned from TCP client select, err=%d", ::GetLastError());
#else
LogError("Error returned from TCP client select, err=%d", errno);
#endif
return -1;
}
#if defined(_WIN32) || defined(_WIN64)
if (!FD_ISSET((unsigned int)m_fd, &readFds))
return 0;
#else
if (!FD_ISSET(m_fd, &readFds))
return 0;
#endif
ssize_t len = ::recv(m_fd, (char*)buffer, length, 0);
if (len == 0) {
return -2;
} else if (len < 0) {
#if defined(_WIN32) || defined(_WIN64)
LogError("Error returned from recv, err=%d", ::GetLastError());
#else
LogError("Error returned from recv, err=%d", errno);
#endif
return -1;
}
return len;
}
int CTCPSocket::readLine(std::string& line, unsigned int secs)
{
// Maybe there is a better way to do this like reading blocks, pushing them for later calls
// Nevermind, we'll read one char at a time for the time being.
int resultCode;
int len = 0;
line.clear();
char c[2U];
c[1U] = 0x00U;
do
{
resultCode = read((unsigned char*)c, 1U, secs);
if (resultCode == 1){
line.append(c);
len++;
}
} while (c[0U] != '\n' && resultCode == 1);
return resultCode <= 0 ? resultCode : len;
}
bool CTCPSocket::write(const unsigned char* buffer, unsigned int length)
{
assert(buffer != NULL);
assert(length > 0U);
assert(m_fd != -1);
ssize_t ret = ::send(m_fd, (char *)buffer, length, 0);
if (ret != ssize_t(length)) {
#if defined(_WIN32) || defined(_WIN64)
LogError("Error returned from send, err=%d", ::GetLastError());
#else
LogError("Error returned from send, err=%d", errno);
#endif
return false;
}
return true;
}
bool CTCPSocket::writeLine(const std::string& line)
{
std::string lineCopy(line);
if (lineCopy.length() > 0 && lineCopy.at(lineCopy.length() - 1) != '\n')
lineCopy.append("\n");
//stupidly write one char after the other
size_t len = lineCopy.length();
bool result = true;
for (size_t i = 0U; i < len && result; i++){
unsigned char c = lineCopy.at(i);
result = write(&c , 1);
}
return result;
}
void CTCPSocket::close()
{
if (m_fd != -1) {
#if defined(_WIN32) || defined(_WIN64)
::closesocket(m_fd);
#else
::close(m_fd);
#endif
m_fd = -1;
}
}