M17 Protocol introduction

reflector/UnixPacketSocket.cpp

@@ -0,0 +1,207 @@
+/*
+ *   Copyright (C) 2020 by Thomas Early N7TAE
+ *
+ *   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 <iostream>
+#include <string>
+#include <thread>
+#include <chrono>
+#include <unistd.h>
+#include <sys/un.h>
+#include <sys/socket.h>
+
+#include "UnixPacketSock.h"
+
+CUnixPacket::CUnixPacket() : m_fd(-1), m_host(NULL) {}
+
+ssize_t CUnixPacket::Read(void *buffer, const ssize_t size)
+{
+	if (0 > m_fd)
+		return -1;
+	ssize_t len = read(m_fd, buffer, size);
+	if (len < 1)
+	{
+		if (-1 == len)
+		{
+			std::cerr << "Read error on '" << m_name << "': " << strerror(errno) << std::endl;
+		}
+		else if (0 == len)
+		{
+			std::cerr << "Read error on '" << m_name << "': EOF" << std::endl;
+		}
+		if (Restart())
+			return -1;
+		else
+			return 0;
+	}
+	return len;
+}
+
+bool CUnixPacket::Write(const void *buffer, const ssize_t size)
+{
+	if (0 > m_fd)
+		return true;
+	ssize_t written = write(m_fd, buffer, size);
+	if (written != size)
+	{
+		if (-1 == written)
+		{
+			std::cerr << "Write error on '" << m_name << "': " << strerror(errno) << std::endl;
+		}
+		else
+		{
+			std::cout << "Write error on '" << m_name << "': Only wrote " << written << " of " << size << " bytes" << std::endl;
+		}
+		return Restart();
+	}
+	return false;
+}
+
+bool CUnixPacket::Restart()
+{
+	if (! m_host->IsRunning())
+		return true;
+	std::cout << "Restarting '" << m_name << "'... " << std::endl;
+	Close();
+	std::string name(m_name);
+	return Open(name.c_str(), m_host);
+}
+
+int CUnixPacket::GetFD()
+{
+	return m_fd;
+}
+
+CUnixPacketServer::CUnixPacketServer() : m_server(-1) {}
+
+CUnixPacketServer::~CUnixPacketServer()
+{
+	Close();
+}
+
+bool CUnixPacketServer::Open(const char *name, CKRBase *host)
+{
+	m_server = socket(AF_UNIX, SOCK_SEQPACKET, 0);
+	m_host = host;
+	if (m_server < 0)
+	{
+		std::cerr << "Cannot open '" << name << "' socket: " << strerror(errno) << std::endl;
+		return true;
+	}
+
+	struct sockaddr_un addr;
+	memset(&addr, 0, sizeof(addr));
+	addr.sun_family = AF_UNIX;
+	memcpy(addr.sun_path+1, name, strlen(name));
+	if (-1 == bind(m_server, (struct sockaddr *)&addr, sizeof(addr)))
+	{
+		std::cerr << "Cannot bind '" << name << "' socket: " << strerror(errno) << std::endl;
+		Close();
+		return true;
+	}
+
+	if (-1 == listen(m_server, 1))
+	{
+		std::cerr << "Cannot listen on '" << name << "' socket: " << strerror(errno) << std::endl;
+		Close();
+		return true;
+	}
+
+	m_fd = accept(m_server, nullptr, 0);
+	if (m_fd < 0)
+	{
+		std::cerr << "Cannot accept on '" << name << "' socket: " << strerror(errno) << std::endl;
+		Close();
+		return true;
+	}
+
+	strncpy(m_name, name, 108);
+	return false;
+}
+
+void CUnixPacketServer::Close()
+{
+	if (m_server >= 0)
+	{
+		close(m_server);
+		m_server = -1;
+	}
+	if (m_fd >= 0)
+	{
+		close(m_fd);
+		m_fd = -1;
+	}
+}
+
+CUnixPacketClient::~CUnixPacketClient()
+{
+	Close();
+}
+
+bool CUnixPacketClient::Open(const char *name, CKRBase *host)
+{
+	m_fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
+	if (m_fd < 0)
+	{
+		std::cerr << "Cannot open unix client socket " << name << std::endl;
+		return true;
+	}
+
+	struct sockaddr_un addr;
+	memset(&addr, 0, sizeof(addr));
+	addr.sun_family = AF_UNIX;
+	memcpy(addr.sun_path+1, name, strlen(name));
+	int rval = -1;
+	int tries = 0;
+	while (rval < 0)
+	{
+		rval = connect(m_fd, (struct sockaddr *)&addr, sizeof(addr));
+		if (rval < 0)
+		{
+			if (ECONNREFUSED == errno)
+			{
+				if (0 == tries++ % 20)
+					std::cout << "Waiting for " << name << " server to start..." << std::endl;
+				std::this_thread::sleep_for(std::chrono::milliseconds(250));
+			}
+			else
+			{
+				std::cerr << "Cannot connect '" << name << "' socket: " << strerror(errno) << std::endl;
+				Close();
+				return true;
+			}
+		}
+		if (! m_host->IsRunning())
+		{
+			Close();
+			return true;
+		}
+	}
+
+	m_host = host;
+	strncpy(m_name, name, 108);
+	return false;
+}
+
+void CUnixPacketClient::Close()
+{
+	if (m_fd >= 0)
+	{
+		close(m_fd);
+		m_fd = -1;
+	}
+}