forked from premiere/premiere-libtorrent
363 lines
9.8 KiB
C++
363 lines
9.8 KiB
C++
/*
|
|
|
|
Copyright (c) 2005-2013, Arvid Norberg
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in
|
|
the documentation and/or other materials provided with the distribution.
|
|
* Neither the name of the author nor the names of its
|
|
contributors may be used to endorse or promote products derived
|
|
from this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
*/
|
|
|
|
#ifndef TORRENT_IP_FILTER_HPP
|
|
#define TORRENT_IP_FILTER_HPP
|
|
|
|
#include <set>
|
|
#include <vector>
|
|
|
|
#ifdef _MSC_VER
|
|
#pragma warning(push, 1)
|
|
#endif
|
|
|
|
#include <boost/limits.hpp>
|
|
#include <boost/utility.hpp>
|
|
#include <boost/tuple/tuple.hpp>
|
|
|
|
#ifdef _MSC_VER
|
|
#pragma warning(pop)
|
|
#endif
|
|
|
|
|
|
#include "libtorrent/config.hpp"
|
|
#include "libtorrent/address.hpp"
|
|
#include "libtorrent/assert.hpp"
|
|
|
|
namespace libtorrent
|
|
{
|
|
|
|
// hidden
|
|
inline bool operator<=(address const& lhs
|
|
, address const& rhs)
|
|
{
|
|
return lhs < rhs || lhs == rhs;
|
|
}
|
|
|
|
template <class Addr>
|
|
struct ip_range
|
|
{
|
|
Addr first;
|
|
Addr last;
|
|
int flags;
|
|
};
|
|
|
|
namespace detail
|
|
{
|
|
|
|
template<class Addr>
|
|
Addr zero()
|
|
{
|
|
Addr zero;
|
|
std::fill(zero.begin(), zero.end(), 0);
|
|
return zero;
|
|
}
|
|
|
|
template<>
|
|
inline boost::uint16_t zero<boost::uint16_t>() { return 0; }
|
|
|
|
template<class Addr>
|
|
Addr plus_one(Addr const& a)
|
|
{
|
|
Addr tmp(a);
|
|
for (int i = int(tmp.size()) - 1; i >= 0; --i)
|
|
{
|
|
if (tmp[i] < (std::numeric_limits<typename Addr::value_type>::max)())
|
|
{
|
|
tmp[i] += 1;
|
|
break;
|
|
}
|
|
tmp[i] = 0;
|
|
}
|
|
return tmp;
|
|
}
|
|
|
|
inline boost::uint16_t plus_one(boost::uint16_t val) { return val + 1; }
|
|
|
|
template<class Addr>
|
|
Addr minus_one(Addr const& a)
|
|
{
|
|
Addr tmp(a);
|
|
for (int i = int(tmp.size()) - 1; i >= 0; --i)
|
|
{
|
|
if (tmp[i] > 0)
|
|
{
|
|
tmp[i] -= 1;
|
|
break;
|
|
}
|
|
tmp[i] = (std::numeric_limits<typename Addr::value_type>::max)();
|
|
}
|
|
return tmp;
|
|
}
|
|
|
|
inline boost::uint16_t minus_one(boost::uint16_t val) { return val - 1; }
|
|
|
|
template<class Addr>
|
|
Addr max_addr()
|
|
{
|
|
Addr tmp;
|
|
std::fill(tmp.begin(), tmp.end()
|
|
, (std::numeric_limits<typename Addr::value_type>::max)());
|
|
return Addr(tmp);
|
|
}
|
|
|
|
template<>
|
|
inline boost::uint16_t max_addr<boost::uint16_t>()
|
|
{ return (std::numeric_limits<boost::uint16_t>::max)(); }
|
|
|
|
// this is the generic implementation of
|
|
// a filter for a specific address type.
|
|
// it works with IPv4 and IPv6
|
|
template<class Addr>
|
|
class filter_impl
|
|
{
|
|
public:
|
|
|
|
filter_impl()
|
|
{
|
|
// make the entire ip-range non-blocked
|
|
m_access_list.insert(range(zero<Addr>(), 0));
|
|
}
|
|
|
|
void add_rule(Addr first, Addr last, int flags)
|
|
{
|
|
TORRENT_ASSERT(!m_access_list.empty());
|
|
TORRENT_ASSERT(first < last || first == last);
|
|
|
|
typename range_t::iterator i = m_access_list.upper_bound(first);
|
|
typename range_t::iterator j = m_access_list.upper_bound(last);
|
|
|
|
if (i != m_access_list.begin()) --i;
|
|
|
|
TORRENT_ASSERT(j != m_access_list.begin());
|
|
TORRENT_ASSERT(j != i);
|
|
|
|
int first_access = i->access;
|
|
int last_access = boost::prior(j)->access;
|
|
|
|
if (i->start != first && first_access != flags)
|
|
{
|
|
i = m_access_list.insert(i, range(first, flags));
|
|
}
|
|
else if (i != m_access_list.begin() && boost::prior(i)->access == flags)
|
|
{
|
|
--i;
|
|
first_access = i->access;
|
|
}
|
|
TORRENT_ASSERT(!m_access_list.empty());
|
|
TORRENT_ASSERT(i != m_access_list.end());
|
|
|
|
if (i != j) m_access_list.erase(boost::next(i), j);
|
|
if (i->start == first)
|
|
{
|
|
// we can do this const-cast because we know that the new
|
|
// start address will keep the set correctly ordered
|
|
const_cast<Addr&>(i->start) = first;
|
|
const_cast<int&>(i->access) = flags;
|
|
}
|
|
else if (first_access != flags)
|
|
{
|
|
m_access_list.insert(i, range(first, flags));
|
|
}
|
|
|
|
if ((j != m_access_list.end()
|
|
&& minus_one(j->start) != last)
|
|
|| (j == m_access_list.end()
|
|
&& last != max_addr<Addr>()))
|
|
{
|
|
TORRENT_ASSERT(j == m_access_list.end() || last < minus_one(j->start));
|
|
if (last_access != flags)
|
|
j = m_access_list.insert(j, range(plus_one(last), last_access));
|
|
}
|
|
|
|
if (j != m_access_list.end() && j->access == flags) m_access_list.erase(j);
|
|
TORRENT_ASSERT(!m_access_list.empty());
|
|
}
|
|
|
|
int access(Addr const& addr) const
|
|
{
|
|
TORRENT_ASSERT(!m_access_list.empty());
|
|
typename range_t::const_iterator i = m_access_list.upper_bound(addr);
|
|
if (i != m_access_list.begin()) --i;
|
|
TORRENT_ASSERT(i != m_access_list.end());
|
|
TORRENT_ASSERT(i->start <= addr && (boost::next(i) == m_access_list.end()
|
|
|| addr < boost::next(i)->start));
|
|
return i->access;
|
|
}
|
|
|
|
template <class ExternalAddressType>
|
|
std::vector<ip_range<ExternalAddressType> > export_filter() const
|
|
{
|
|
std::vector<ip_range<ExternalAddressType> > ret;
|
|
ret.reserve(m_access_list.size());
|
|
|
|
for (typename range_t::const_iterator i = m_access_list.begin()
|
|
, end(m_access_list.end()); i != end;)
|
|
{
|
|
ip_range<ExternalAddressType> r;
|
|
r.first = ExternalAddressType(i->start);
|
|
r.flags = i->access;
|
|
|
|
++i;
|
|
if (i == end)
|
|
r.last = ExternalAddressType(max_addr<Addr>());
|
|
else
|
|
r.last = ExternalAddressType(minus_one(i->start));
|
|
|
|
ret.push_back(r);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
private:
|
|
|
|
struct range
|
|
{
|
|
range(Addr addr, int a = 0): start(addr), access(a) {}
|
|
bool operator<(range const& r) const
|
|
{ return start < r.start; }
|
|
bool operator<(Addr const& a) const
|
|
{ return start < a; }
|
|
Addr start;
|
|
// the end of the range is implicit
|
|
// and given by the next entry in the set
|
|
int access;
|
|
};
|
|
|
|
typedef std::set<range> range_t;
|
|
range_t m_access_list;
|
|
|
|
};
|
|
|
|
}
|
|
|
|
// The ``ip_filter`` class is a set of rules that uniquely categorizes all
|
|
// ip addresses as allowed or disallowed. The default constructor creates
|
|
// a single rule that allows all addresses (0.0.0.0 - 255.255.255.255 for
|
|
// the IPv4 range, and the equivalent range covering all addresses for the
|
|
// IPv6 range).
|
|
//
|
|
// A default constructed ip_filter does not filter any address.
|
|
struct TORRENT_EXPORT ip_filter
|
|
{
|
|
// the flags defined for an IP range
|
|
enum access_flags
|
|
{
|
|
// indicates that IPs in this range should not be connected
|
|
// to nor accepted as incoming connections
|
|
blocked = 1
|
|
};
|
|
|
|
// Adds a rule to the filter. ``first`` and ``last`` defines a range of
|
|
// ip addresses that will be marked with the given flags. The ``flags``
|
|
// can currently be 0, which means allowed, or ``ip_filter::blocked``, which
|
|
// means disallowed.
|
|
//
|
|
// precondition:
|
|
// ``first.is_v4() == last.is_v4() && first.is_v6() == last.is_v6()``
|
|
//
|
|
// postcondition:
|
|
// ``access(x) == flags`` for every ``x`` in the range [``first``, ``last``]
|
|
//
|
|
// This means that in a case of overlapping ranges, the last one applied takes
|
|
// precedence.
|
|
void add_rule(address first, address last, int flags);
|
|
|
|
// Returns the access permissions for the given address (``addr``). The permission
|
|
// can currently be 0 or ``ip_filter::blocked``. The complexity of this operation
|
|
// is O(``log`` n), where n is the minimum number of non-overlapping ranges to describe
|
|
// the current filter.
|
|
int access(address const& addr) const;
|
|
|
|
#if TORRENT_USE_IPV6
|
|
typedef boost::tuple<std::vector<ip_range<address_v4> >
|
|
, std::vector<ip_range<address_v6> > > filter_tuple_t;
|
|
#else
|
|
typedef std::vector<ip_range<address_v4> > filter_tuple_t;
|
|
#endif
|
|
|
|
// This function will return the current state of the filter in the minimum number of
|
|
// ranges possible. They are sorted from ranges in low addresses to high addresses. Each
|
|
// entry in the returned vector is a range with the access control specified in its
|
|
// ``flags`` field.
|
|
//
|
|
// The return value is a tuple containing two range-lists. One for IPv4 addresses
|
|
// and one for IPv6 addresses.
|
|
filter_tuple_t export_filter() const;
|
|
|
|
// void print() const;
|
|
|
|
private:
|
|
|
|
detail::filter_impl<address_v4::bytes_type> m_filter4;
|
|
#if TORRENT_USE_IPV6
|
|
detail::filter_impl<address_v6::bytes_type> m_filter6;
|
|
#endif
|
|
};
|
|
|
|
// the port filter maps non-overlapping port ranges to flags. This
|
|
// is primarily used to indicate whether a range of ports should
|
|
// be connected to or not. The default is to have the full port
|
|
// range (0-65535) set to flag 0.
|
|
class TORRENT_EXPORT port_filter
|
|
{
|
|
public:
|
|
|
|
// the defined flags for a port range
|
|
enum access_flags
|
|
{
|
|
// this flag indicates that destination ports in the
|
|
// range should not be connected to
|
|
blocked = 1
|
|
};
|
|
|
|
// set the flags for the specified port range (``first``, ``last``) to
|
|
// ``flags`` overwriting any existing rule for those ports. The range
|
|
// is inclusive, i.e. the port ``last`` also has the flag set on it.
|
|
void add_rule(boost::uint16_t first, boost::uint16_t last, int flags);
|
|
|
|
// test the specified port (``port``) for whether it is blocked
|
|
// or not. The returned value is the flags set for this port.
|
|
// see acces_flags.
|
|
int access(boost::uint16_t port) const;
|
|
|
|
private:
|
|
|
|
detail::filter_impl<boost::uint16_t> m_filter;
|
|
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|
|
|