mirror of
https://github.com/PurpleI2P/i2pd.git
synced 2024-10-31 09:20:38 +00:00
249 lines
7.2 KiB
C++
249 lines
7.2 KiB
C++
#include <string.h>
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#include "I2PEndian.h"
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#include "Crypto.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, size_t len, bool storeLeases):
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m_IsValid (true), m_StoreLeases (storeLeases), m_ExpirationTime (0)
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{
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m_Buffer = new uint8_t[len];
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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 (std::shared_ptr<const i2p::tunnel::TunnelPool> pool):
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m_IsValid (true), m_StoreLeases (true), m_ExpirationTime (0)
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{
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if (!pool) return;
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// header
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auto localDestination = pool->GetLocalDestination ();
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if (!localDestination)
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{
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m_Buffer = nullptr;
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m_BufferLen = 0;
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m_IsValid = false;
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LogPrint (eLogError, "LeaseSet: Destination for local LeaseSet doesn't exist");
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return;
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}
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m_Buffer = new uint8_t[MAX_LS_BUFFER_SIZE];
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m_BufferLen = localDestination->GetIdentity ()->ToBuffer (m_Buffer, MAX_LS_BUFFER_SIZE);
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memcpy (m_Buffer + m_BufferLen, localDestination->GetEncryptionPublicKey (), 256);
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m_BufferLen += 256;
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auto signingKeyLen = localDestination->GetIdentity ()->GetSigningPublicKeyLen ();
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memset (m_Buffer + m_BufferLen, 0, signingKeyLen);
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m_BufferLen += signingKeyLen;
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int numTunnels = pool->GetNumInboundTunnels () + 2; // 2 backup tunnels
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if (numTunnels > 16) numTunnels = 16; // 16 tunnels maximum
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auto tunnels = pool->GetInboundTunnels (numTunnels);
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m_Buffer[m_BufferLen] = tunnels.size (); // num leases
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m_BufferLen++;
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// leases
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auto currentTime = i2p::util::GetMillisecondsSinceEpoch ();
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for (auto it: tunnels)
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{
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memcpy (m_Buffer + m_BufferLen, it->GetNextIdentHash (), 32);
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m_BufferLen += 32; // gateway id
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htobe32buf (m_Buffer + m_BufferLen, it->GetNextTunnelID ());
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m_BufferLen += 4; // tunnel id
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uint64_t ts = it->GetCreationTime () + i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT - i2p::tunnel::TUNNEL_EXPIRATION_THRESHOLD; // 1 minute before expiration
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ts *= 1000; // in milliseconds
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if (ts > m_ExpirationTime) m_ExpirationTime = ts;
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// make sure leaseset is newer than previous, but adding some time to expiration date
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ts += (currentTime - it->GetCreationTime ()*1000LL)*2/i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT; // up to 2 secs
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htobe64buf (m_Buffer + m_BufferLen, ts);
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m_BufferLen += 8; // end date
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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 += localDestination->GetIdentity ()->GetSignatureLen ();
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LogPrint (eLogDebug, "LeaseSet: 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, size_t len)
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{
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if (len > m_BufferLen)
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{
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auto oldBuffer = m_Buffer;
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m_Buffer = new uint8_t[len];
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delete[] oldBuffer;
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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 (false);
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}
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void LeaseSet::PopulateLeases ()
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{
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m_StoreLeases = true;
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ReadFromBuffer (false);
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}
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void LeaseSet::ReadFromBuffer (bool readIdentity)
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{
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if (readIdentity || !m_Identity)
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m_Identity = std::make_shared<IdentityEx>(m_Buffer, m_BufferLen);
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size_t size = m_Identity->GetFullLen ();
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if (size > m_BufferLen)
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{
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LogPrint (eLogError, "LeaseSet: identity length ", size, " exceeds buffer size ", m_BufferLen);
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m_IsValid = false;
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return;
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}
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memcpy (m_EncryptionKey, m_Buffer + size, 256);
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size += 256; // encryption key
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size += m_Identity->GetSigningPublicKeyLen (); // unused signing key
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uint8_t num = m_Buffer[size];
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size++; // num
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LogPrint (eLogDebug, "LeaseSet: read num=", (int)num);
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if (!num || num > MAX_NUM_LEASES)
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{
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LogPrint (eLogError, "LeaseSet: incorrect number of leases", (int)num);
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m_IsValid = false;
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return;
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}
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// reset existing leases
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if (m_StoreLeases)
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for (auto it: m_Leases)
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it->isUpdated = false;
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else
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m_Leases.clear ();
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// process leases
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m_ExpirationTime = 0;
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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const uint8_t * leases = m_Buffer + size;
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for (int i = 0; i < num; i++)
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{
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Lease lease;
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lease.tunnelGateway = leases;
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leases += 32; // gateway
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lease.tunnelID = bufbe32toh (leases);
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leases += 4; // tunnel ID
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lease.endDate = bufbe64toh (leases);
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leases += 8; // end date
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if (ts < lease.endDate + LEASE_ENDDATE_THRESHOLD)
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{
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if (lease.endDate > m_ExpirationTime)
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m_ExpirationTime = lease.endDate;
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if (m_StoreLeases)
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{
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auto ret = m_Leases.insert (std::make_shared<Lease>(lease));
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if (!ret.second) *(*ret.first) = lease; // update existing
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(*ret.first)->isUpdated = true;
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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 (eLogInfo, "LeaseSet: Lease's tunnel gateway not found, requesting");
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netdb.RequestDestination (lease.tunnelGateway);
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}
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}
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}
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else
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LogPrint (eLogWarning, "LeaseSet: Lease is expired already ");
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}
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if (!m_ExpirationTime)
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{
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LogPrint (eLogWarning, "LeaseSet: all leases are expired. Dropped");
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m_IsValid = false;
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return;
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}
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m_ExpirationTime += LEASE_ENDDATE_THRESHOLD;
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// delete old leases
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if (m_StoreLeases)
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{
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for (auto it = m_Leases.begin (); it != m_Leases.end ();)
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{
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if (!(*it)->isUpdated)
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{
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(*it)->endDate = 0; // somebody might still hold it
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m_Leases.erase (it++);
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}
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else
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it++;
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}
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}
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// verify
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if (!m_Identity->Verify (m_Buffer, leases - m_Buffer, leases))
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{
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LogPrint (eLogWarning, "LeaseSet: verification failed");
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m_IsValid = false;
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}
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}
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uint64_t LeaseSet::ExtractTimestamp (const uint8_t * buf, size_t len) const
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{
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if (!m_Identity) return 0;
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size_t size = m_Identity->GetFullLen ();
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if (size > len) return 0;
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size += 256; // encryption key
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size += m_Identity->GetSigningPublicKeyLen (); // unused signing key
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if (size > len) return 0;
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uint8_t num = buf[size];
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size++; // num
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if (size + num*44 > len) return 0;
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uint64_t timestamp= 0 ;
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for (int i = 0; i < num; i++)
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{
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size += 36; // gateway (32) + tunnelId(4)
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auto endDate = bufbe64toh (buf + size);
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size += 8; // end date
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if (!timestamp || endDate < timestamp)
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timestamp = endDate;
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}
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return timestamp;
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}
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bool LeaseSet::IsNewer (const uint8_t * buf, size_t len) const
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{
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return ExtractTimestamp (buf, len) > ExtractTimestamp (m_Buffer, m_BufferLen);
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}
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const std::vector<std::shared_ptr<const Lease> > LeaseSet::GetNonExpiredLeases (bool withThreshold) const
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{
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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std::vector<std::shared_ptr<const Lease> > leases;
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for (auto it: m_Leases)
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{
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auto endDate = it->endDate;
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if (withThreshold)
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endDate += LEASE_ENDDATE_THRESHOLD;
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else
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endDate -= LEASE_ENDDATE_THRESHOLD;
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if (ts < endDate)
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leases.push_back (it);
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}
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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::IsExpired () const
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{
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if (IsEmpty ()) return true;
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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return ts > m_ExpirationTime;
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}
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}
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}
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