mirror of
https://github.com/PurpleI2P/i2pd.git
synced 2024-11-08 01:10:40 +00:00
126 lines
3.5 KiB
C++
126 lines
3.5 KiB
C++
#include "I2PEndian.h"
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#include <cryptopp/dsa.h>
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#include "CryptoConst.h"
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#include "Log.h"
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#include "Timestamp.h"
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#include "NetDb.h"
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#include "TunnelPool.h"
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#include "LeaseSet.h"
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namespace i2p
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{
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namespace data
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{
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LeaseSet::LeaseSet (const uint8_t * buf, int len, bool unsolicited):
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m_IsUnsolicited (unsolicited)
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{
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memcpy (m_Buffer, buf, len);
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m_BufferLen = len;
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ReadFromBuffer ();
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}
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LeaseSet::LeaseSet (const i2p::tunnel::TunnelPool& pool):
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m_IsUnsolicited (false)
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{
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m_BufferLen = 0;
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// header
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const i2p::data::LocalDestination& localDestination = pool.GetLocalDestination ();
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LeaseSetHeader * header = (LeaseSetHeader *)m_Buffer;
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header->destination = localDestination.GetIdentity ();
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memcpy (header->encryptionKey, localDestination.GetEncryptionPublicKey (), 256);
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memset (header->signingKey, 0, 128);
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auto tunnels = pool.GetInboundTunnels (5); // 5 tunnels maximum
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header->num = tunnels.size (); // num leases
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m_BufferLen += sizeof (LeaseSetHeader);
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// leases
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for (auto it: tunnels)
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{
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Lease * lease = (Lease *)(m_Buffer + m_BufferLen);
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memcpy (lease->tunnelGateway, it->GetNextIdentHash (), 32);
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lease->tunnelID = htobe32 (it->GetNextTunnelID ());
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uint64_t ts = it->GetCreationTime () + i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT - 60; // 1 minute before expiration
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ts *= 1000; // in milliseconds
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lease->endDate = htobe64 (ts);
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m_BufferLen += sizeof (Lease);
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}
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// signature
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localDestination.Sign (m_Buffer, m_BufferLen, m_Buffer + m_BufferLen);
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m_BufferLen += 40;
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LogPrint ("Local LeaseSet of ", tunnels.size (), " leases created");
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ReadFromBuffer ();
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}
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void LeaseSet::Update (const uint8_t * buf, int len)
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{
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m_Leases.clear ();
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memcpy (m_Buffer, buf, len);
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m_BufferLen = len;
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ReadFromBuffer ();
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}
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void LeaseSet::ReadFromBuffer ()
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{
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const LeaseSetHeader * header = (const LeaseSetHeader *)m_Buffer;
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m_Identity = header->destination;
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m_IdentHash = m_Identity.Hash();
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memcpy (m_EncryptionKey, header->encryptionKey, 256);
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LogPrint ("LeaseSet num=", (int)header->num);
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// process leases
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const uint8_t * leases = m_Buffer + sizeof (LeaseSetHeader);
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for (int i = 0; i < header->num; i++)
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{
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Lease lease = *(Lease *)leases;
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lease.tunnelID = be32toh (lease.tunnelID);
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lease.endDate = be64toh (lease.endDate);
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m_Leases.push_back (lease);
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leases += sizeof (Lease);
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// check if lease's gateway is in our netDb
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if (!netdb.FindRouter (lease.tunnelGateway))
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{
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// if not found request it
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LogPrint ("Lease's tunnel gateway not found. Requested");
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netdb.RequestDestination (lease.tunnelGateway);
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}
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}
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// verify
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CryptoPP::DSA::PublicKey pubKey;
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pubKey.Initialize (i2p::crypto::dsap, i2p::crypto::dsaq, i2p::crypto::dsag,
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CryptoPP::Integer (m_Identity.signingKey, 128));
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CryptoPP::DSA::Verifier verifier (pubKey);
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if (!verifier.VerifyMessage (m_Buffer, leases - m_Buffer, leases, 40))
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LogPrint ("LeaseSet verification failed");
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}
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const std::vector<Lease> LeaseSet::GetNonExpiredLeases () const
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{
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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std::vector<Lease> leases;
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for (auto& it: m_Leases)
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if (ts < it.endDate)
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leases.push_back (it);
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return leases;
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}
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bool LeaseSet::HasExpiredLeases () const
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{
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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for (auto& it: m_Leases)
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if (ts >= it.endDate) return true;
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return false;
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}
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bool LeaseSet::HasNonExpiredLeases () const
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{
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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for (auto& it: m_Leases)
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if (ts < it.endDate) return true;
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return false;
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}
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}
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}
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