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/******************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Debug Bridge.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
******************************************************************************/
#include "subnet.h"
#include <QtNetwork/qnetworkinterface.h>
namespace {
std::vector<Subnet> fetchUsedSubnets()
{
std::vector<Subnet> subnets;
for (const QNetworkInterface &interface : QNetworkInterface::allInterfaces())
for (const QNetworkAddressEntry &entry : interface.addressEntries())
subnets.push_back(Subnet{entry.ip(), entry.prefixLength()});
return subnets;
}
} // anonymous namespace
SubnetReservation findUnusedSubnet()
{
SubnetPool *pool = SubnetPool::instance();
const std::vector<Subnet> usedSubnets = fetchUsedSubnets();
const std::pair<Subnet, bool> result = findUnusedSubnet(pool->candidates(),
usedSubnets);
if (!result.second)
return SubnetReservation{};
return pool->reserve(result.first);
}
std::pair<Subnet, bool> findUnusedSubnet(const std::vector<Subnet> &candidateSubnets,
const std::vector<Subnet> &usedSubnets)
{
for (const Subnet &candidate : candidateSubnets) {
auto overlaps = [&candidate](const Subnet &subnet) {
// Subnets are defined by prefix masks, so they can't overlap partially.
// If there is overlap, one is a subset of the other.
return candidate.address.isInSubnet(subnet.address, subnet.prefixLength)
|| subnet.address.isInSubnet(candidate.address, candidate.prefixLength);
};
if (std::none_of(usedSubnets.begin(), usedSubnets.end(), overlaps))
return std::make_pair(candidate, true);
}
return std::make_pair(Subnet{}, false);
}
SubnetPool *SubnetPool::instance()
{
static SubnetPool pool;
return &pool;
}
std::vector<Subnet> SubnetPool::candidates()
{
QMutexLocker locker{&m_lock};
std::vector<Subnet> freeCandidates;
freeCandidates.reserve(m_candidates.size() - m_reserved.size());
std::copy_if(m_candidates.begin(), m_candidates.end(),
std::back_inserter(freeCandidates),
[&](const Subnet &subnet) {
return std::find(m_reserved.begin(), m_reserved.end(), subnet)
== m_reserved.end();
});
return freeCandidates;
}
SubnetReservation SubnetPool::reserve(const Subnet &subnet)
{
QMutexLocker locker{&m_lock};
const auto iter = std::find(m_reserved.begin(), m_reserved.end(), subnet);
if (iter != m_reserved.end()) // Already reserved
return SubnetReservation{};
m_reserved.push_back(subnet);
return std::make_shared<SubnetReservationImpl>(subnet);
}
void SubnetPool::free(const Subnet &subnet)
{
QMutexLocker locker{&m_lock};
const auto iter = std::find(m_reserved.begin(), m_reserved.end(), subnet);
if (iter != m_reserved.end())
m_reserved.erase(iter);
}
SubnetPool::SubnetPool()
: m_lock{},
m_candidates(),
m_reserved{}
{
// MSVC 2013 gave error C2707 when trying to use initializer list for m_candidates
m_candidates.push_back({QHostAddress{"172.16.58.1"}, 30});
m_candidates.push_back({QHostAddress{"172.17.58.1"}, 30});
m_candidates.push_back({QHostAddress{"172.18.58.1"}, 30});
m_candidates.push_back({QHostAddress{"172.19.58.1"}, 30});
m_candidates.push_back({QHostAddress{"172.20.58.1"}, 30});
m_candidates.push_back({QHostAddress{"172.21.58.1"}, 30});
m_candidates.push_back({QHostAddress{"172.22.58.1"}, 30});
m_candidates.push_back({QHostAddress{"172.23.58.1"}, 30});
m_candidates.push_back({QHostAddress{"172.24.58.1"}, 30});
m_candidates.push_back({QHostAddress{"172.25.58.1"}, 30});
m_candidates.push_back({QHostAddress{"172.26.58.1"}, 30});
m_candidates.push_back({QHostAddress{"172.27.58.1"}, 30});
m_candidates.push_back({QHostAddress{"172.28.58.1"}, 30});
m_candidates.push_back({QHostAddress{"172.29.58.1"}, 30});
m_candidates.push_back({QHostAddress{"172.30.58.1"}, 30});
m_candidates.push_back({QHostAddress{"172.31.58.1"}, 30});
m_candidates.push_back({QHostAddress{"192.168.58.1"}, 30});
m_candidates.push_back({QHostAddress{"10.17.20.1"}, 30});
}
bool operator==(const Subnet &lhs, const Subnet &rhs)
{
return lhs.address == rhs.address
&& lhs.prefixLength == rhs.prefixLength;
}
SubnetReservationImpl::SubnetReservationImpl(const Subnet &subnet)
: m_subnet(subnet) // uniform initialization with {} fails in MSVC 2013 with error C2797
{
}
SubnetReservationImpl::~SubnetReservationImpl()
{
SubnetPool::instance()->free(m_subnet);
}
Subnet SubnetReservationImpl::subnet() const
{
return m_subnet;
}
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