i2pd/LeaseSet.cpp

#include "I2PEndian.h"
#include <cryptopp/dsa.h>
#include "CryptoConst.h"
#include "Log.h"
#include "Timestamp.h"
#include "NetDb.h"
#include "LeaseSet.h"

namespace i2p
{
namespace data
{
	
	LeaseSet::LeaseSet (const uint8_t * buf, int len)
	{
		ReadFromBuffer (buf, len);
	}

	void LeaseSet::Update (const uint8_t * buf, int len)
	{	
		m_Leases.clear ();
		ReadFromBuffer (buf, len);
	}
	
	void LeaseSet::ReadFromBuffer (const uint8_t * buf, int len)	
	{	
#pragma pack(1)
		struct H
		{
			Identity destination;
			uint8_t encryptionKey[256];
			uint8_t signingKey[128];
			uint8_t num;
		};		
#pragma pack ()	

		const H * header = (const H *)buf;
		m_Identity = header->destination;
		m_IdentHash = m_Identity.Hash();
		memcpy (m_EncryptionKey, header->encryptionKey, 256);
		LogPrint ("LeaseSet num=", (int)header->num);

		// process leases
		const uint8_t * leases = buf + sizeof (H);
		for (int i = 0; i < header->num; i++)
		{
			Lease lease = *(Lease *)leases;
			lease.tunnelID = be32toh (lease.tunnelID);
			lease.endDate = be64toh (lease.endDate);
			m_Leases.push_back (lease);
			leases += sizeof (Lease);

			// check if lease's gateway is in our netDb
			if (!netdb.FindRouter (lease.tunnelGateway))
			{
				// if not found request it
				LogPrint ("Lease's tunnel gateway not found. Requested");
				netdb.RequestDestination (lease.tunnelGateway);
			}	
		}	
		
		// verify
		CryptoPP::DSA::PublicKey pubKey;
		pubKey.Initialize (i2p::crypto::dsap, i2p::crypto::dsaq, i2p::crypto::dsag, 
			CryptoPP::Integer (m_Identity.signingKey, 128));
		CryptoPP::DSA::Verifier verifier (pubKey);
		if (!verifier.VerifyMessage (buf, leases - buf, leases, 40))
			LogPrint ("LeaseSet verification failed");
	}				
	
	const std::vector<Lease> LeaseSet::GetNonExpiredLeases () const
	{
		auto ts = i2p::util::GetMillisecondsSinceEpoch ();
		std::vector<Lease> leases;
		for (auto& it: m_Leases)
			if (ts < it.endDate)
				leases.push_back (it);
		return leases;	
	}	

	bool LeaseSet::HasExpiredLeases () const
	{
		auto ts = i2p::util::GetMillisecondsSinceEpoch ();
		for (auto& it: m_Leases)
			if (ts >= it.endDate) return true;
		return false;
	}	

	bool LeaseSet::HasNonExpiredLeases () const
	{
		auto ts = i2p::util::GetMillisecondsSinceEpoch ();
		for (auto& it: m_Leases)
			if (ts < it.endDate) return true;
		return false;
	}	
}		
}