mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-19 04:57:53 +00:00
124 lines
4.2 KiB
C++
124 lines
4.2 KiB
C++
/*
|
|
* ZeroTier One - Network Virtualization Everywhere
|
|
* Copyright (C) 2011-2019 ZeroTier, Inc. https://www.zerotier.com/
|
|
*
|
|
* 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 3 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, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* --
|
|
*
|
|
* You can be released from the requirements of the license by purchasing
|
|
* a commercial license. Buying such a license is mandatory as soon as you
|
|
* develop commercial closed-source software that incorporates or links
|
|
* directly against ZeroTier software without disclosing the source code
|
|
* of your own application.
|
|
*/
|
|
|
|
#ifndef ZT_MULTICASTSUBSCRIPTIONS_HPP
|
|
#define ZT_MULTICASTSUBSCRIPTIONS_HPP
|
|
|
|
#include "Constants.hpp"
|
|
#include "MulticastGroup.hpp"
|
|
#include "Identity.hpp"
|
|
#include "Buffer.hpp"
|
|
|
|
namespace ZeroTier {
|
|
|
|
/**
|
|
* A compact collection of multicast subscriptions identified by 32-bit hash values
|
|
*/
|
|
class MulticastSubscriptions
|
|
{
|
|
public:
|
|
inline MulticastSubscriptions() : _signatureLength(0) {}
|
|
|
|
inline void add(const MulticastGroup &mg)
|
|
{
|
|
if (_subscriptions.size() < ZT_MAX_MULTICAST_SUBSCRIPTIONS)
|
|
_subscriptions.push_back(mg.id32());
|
|
}
|
|
|
|
inline bool sign(const Identity &signer,const int64_t ts)
|
|
{
|
|
_ts = ts;
|
|
std::sort(_subscriptions.begin(),_subscriptions.end());
|
|
_subscriptions.erase(std::unique(_subscriptions.begin(),_subscriptions.end()),_subscriptions.end());
|
|
|
|
_SRec tmp;
|
|
tmp.ts = Utils::hton((uint64_t)ts);
|
|
for(unsigned long i=0,j=(unsigned long)_subscriptions.size();i<j;++i)
|
|
tmp.g[i] = Utils::hton(_subscriptions[i]);
|
|
|
|
_signatureLength = signer.sign(&tmp,(unsigned int)((_subscriptions.size() * sizeof(uint32_t)) + sizeof(uint64_t)),_signature,sizeof(_signature));
|
|
return (_signatureLength > 0);
|
|
}
|
|
|
|
inline bool verify(const Identity &signer)
|
|
{
|
|
if ((_signatureLength == 0)||(_signatureLength > ZT_SIGNATURE_BUFFER_SIZE))
|
|
return false;
|
|
_SRec tmp;
|
|
tmp.ts = Utils::hton((uint64_t)_ts);
|
|
for(unsigned long i=0,j=(unsigned long)_subscriptions.size();i<j;++i)
|
|
tmp.g[i] = Utils::hton(_subscriptions[i]);
|
|
return signer.verify(&tmp,(unsigned int)((_subscriptions.size() * sizeof(uint32_t)) + sizeof(uint64_t)),_signature,_signatureLength);
|
|
}
|
|
|
|
inline int64_t timestamp() const { return _ts; }
|
|
inline unsigned int count() const { return (unsigned int)_subscriptions.size(); }
|
|
inline bool contains(const MulticastGroup &mg) const { return std::binary_search(_subscriptions.begin(),_subscriptions.end(),mg.id32()); }
|
|
|
|
template<unsigned int C>
|
|
inline void serialize(Buffer<C> &b) const
|
|
{
|
|
b.append((uint64_t)_ts);
|
|
b.append((uint16_t)_subscriptions.size());
|
|
for(std::vector<uint32_t>::const_iterator i(_subscriptions.begin());i!=_subscriptions.end();++i)
|
|
b.append(*i);
|
|
b.append((uint16_t)_signatureLength);
|
|
b.append(_signature,_signatureLength);
|
|
}
|
|
|
|
template<unsigned int C>
|
|
inline unsigned int deserialize(const Buffer<C> &b,unsigned int startAt = 0)
|
|
{
|
|
unsigned int p = startAt;
|
|
_ts = (int64_t)(b.template at<uint64_t>(p)); p += 8;
|
|
_subscriptions.resize(b.template at<uint16_t>(p)); p += 2;
|
|
for(std::vector<uint32_t>::iterator i(_subscriptions.begin());i!=_subscriptions.end();++i) {
|
|
*i = b.template at<uint32_t>(p);
|
|
p += 4;
|
|
}
|
|
_signatureLength = b.template at<uint16_t>(p); p += 2;
|
|
if (_signatureLength > ZT_SIGNATURE_BUFFER_SIZE)
|
|
throw ZT_EXCEPTION_INVALID_SERIALIZED_DATA_OVERFLOW;
|
|
memcpy(_signature,b.field(p,_signatureLength),_signatureLength); p += _signatureLength;
|
|
return (p - startAt);
|
|
}
|
|
|
|
private:
|
|
ZT_PACKED_STRUCT(struct _SRec {
|
|
uint64_t ts;
|
|
uint32_t g[ZT_MAX_MULTICAST_SUBSCRIPTIONS];
|
|
});
|
|
|
|
int64_t _ts;
|
|
std::vector<uint32_t> _subscriptions;
|
|
unsigned int _signatureLength;
|
|
uint8_t _signature[ZT_SIGNATURE_BUFFER_SIZE];
|
|
};
|
|
|
|
} // namespace ZeroTier
|
|
|
|
#endif
|