barrier/src/lib/net/NetworkAddress.cpp

/*
 * synergy -- mouse and keyboard sharing utility
 * Copyright (C) 2012 Synergy Si Ltd.
 * Copyright (C) 2002 Chris Schoeneman
 * 
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file COPYING that should have accompanied this file.
 * 
 * This package 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, see <http://www.gnu.org/licenses/>.
 */

#include "net/NetworkAddress.h"

#include "net/XSocket.h"
#include "arch/Arch.h"
#include "arch/XArch.h"

#include <cstdlib>

//
// NetworkAddress
//

// name re-resolution adapted from a patch by Brent Priddy.

NetworkAddress::NetworkAddress() :
	m_address(NULL),
	m_hostname(),
	m_port(0)
{
	// note -- make no calls to Network socket interface here;
	// we're often called prior to Network::init().
}

NetworkAddress::NetworkAddress(int port) :
	m_address(NULL),
	m_hostname(),
	m_port(port)
{
	checkPort();
	m_address = ARCH->newAnyAddr(IArchNetwork::kINET);
	ARCH->setAddrPort(m_address, m_port);
}

NetworkAddress::NetworkAddress(const NetworkAddress& addr) :
	m_address(addr.m_address != NULL ? ARCH->copyAddr(addr.m_address) : NULL),
	m_hostname(addr.m_hostname),
	m_port(addr.m_port)
{
	// do nothing
}

NetworkAddress::NetworkAddress(const String& hostname, int port) :
	m_address(NULL),
	m_hostname(hostname),
	m_port(port)
{
	// check for port suffix
	String::size_type i = m_hostname.rfind(':');
	if (i != String::npos && i + 1 < m_hostname.size()) {
		// found a colon.  see if it looks like an IPv6 address.
		bool colonNotation = false;
		bool dotNotation   = false;
		bool doubleColon   = false;
		for (String::size_type j = 0; j < i; ++j) {
			if (m_hostname[j] == ':') {
				colonNotation = true;
				dotNotation   = false;
				if (m_hostname[j + 1] == ':') {
					doubleColon = true;
				}
			}
			else if (m_hostname[j] == '.' && colonNotation) {
				dotNotation = true;
			}
		}

		// port suffix is ambiguous with IPv6 notation if there's
		// a double colon and the end of the address is not in dot
		// notation.  in that case we assume it's not a port suffix.
		// the user can replace the double colon with zeros to
		// disambiguate.
		if ((!doubleColon || dotNotation) || !colonNotation) {
			// parse port from hostname
			char* end;
			const char* chostname = m_hostname.c_str();
			long suffixPort = strtol(chostname + i + 1, &end, 10);
			if (end == chostname + i + 1 || *end != '\0') {
				throw XSocketAddress(XSocketAddress::kBadPort,
											m_hostname, m_port);
			}

			// trim port from hostname
			m_hostname.erase(i);

			// save port
			m_port = static_cast<int>(suffixPort);
		}
	}

	// check port number
	checkPort();
}

NetworkAddress::~NetworkAddress()
{
	if (m_address != NULL) {
		ARCH->closeAddr(m_address);
	}
}

NetworkAddress&
NetworkAddress::operator=(const NetworkAddress& addr)
{
	ArchNetAddress newAddr = NULL;
	if (addr.m_address != NULL) {
		newAddr = ARCH->copyAddr(addr.m_address);
	}
	if (m_address != NULL) {
		ARCH->closeAddr(m_address);
	}
	m_address  = newAddr;
	m_hostname = addr.m_hostname;
	m_port     = addr.m_port;
	return *this;
}

void
NetworkAddress::resolve()
{
	// discard previous address
	if (m_address != NULL) {
		ARCH->closeAddr(m_address);
		m_address = NULL;
	}

	try {
		// if hostname is empty then use wildcard address otherwise look
		// up the name.
		if (m_hostname.empty()) {
			m_address = ARCH->newAnyAddr(IArchNetwork::kINET);
		}
		else {
			m_address = ARCH->nameToAddr(m_hostname);
		}
	}
	catch (XArchNetworkNameUnknown&) {
		throw XSocketAddress(XSocketAddress::kNotFound, m_hostname, m_port);
	}
	catch (XArchNetworkNameNoAddress&) {
		throw XSocketAddress(XSocketAddress::kNoAddress, m_hostname, m_port);
	}
	catch (XArchNetworkNameUnsupported&) {
		throw XSocketAddress(XSocketAddress::kUnsupported, m_hostname, m_port);
	}
	catch (XArchNetworkName&) {
		throw XSocketAddress(XSocketAddress::kUnknown, m_hostname, m_port);
	}

	// set port in address
	ARCH->setAddrPort(m_address, m_port);
}

bool
NetworkAddress::operator==(const NetworkAddress& addr) const
{
	return ARCH->isEqualAddr(m_address, addr.m_address);
}

bool
NetworkAddress::operator!=(const NetworkAddress& addr) const
{
	return !operator==(addr);
}

bool
NetworkAddress::isValid() const
{
	return (m_address != NULL);
}

const ArchNetAddress&
NetworkAddress::getAddress() const
{
	return m_address;
}

int
NetworkAddress::getPort() const
{
	return m_port;
}

String
NetworkAddress::getHostname() const
{
	return m_hostname;
}

void
NetworkAddress::checkPort()
{
	// check port number
	if (m_port <= 0 || m_port > 65535) {
		throw XSocketAddress(XSocketAddress::kBadPort, m_hostname, m_port);
	}
}