mirror of
https://github.com/PurpleI2P/i2pd.git
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205 lines
7.0 KiB
C++
205 lines
7.0 KiB
C++
#ifndef LEASE_SET_H__
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#define LEASE_SET_H__
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#include <inttypes.h>
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#include <string.h>
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#include <vector>
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#include <set>
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#include <memory>
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#include "Identity.h"
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#include "Timestamp.h"
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namespace i2p
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{
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namespace tunnel
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{
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class InboundTunnel;
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}
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namespace data
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{
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const int LEASE_ENDDATE_THRESHOLD = 51000; // in milliseconds
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struct Lease
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{
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IdentHash tunnelGateway;
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uint32_t tunnelID;
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uint64_t endDate; // 0 means invalid
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bool isUpdated; // trasient
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/* return true if this lease expires within t millisecond + fudge factor */
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bool ExpiresWithin( const uint64_t t, const uint64_t fudge = 1000 ) const {
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auto expire = i2p::util::GetMillisecondsSinceEpoch ();
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if(fudge) expire += rand() % fudge;
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if (endDate < expire) return true;
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return (endDate - expire) < t;
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}
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};
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struct LeaseCmp
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{
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bool operator() (std::shared_ptr<const Lease> l1, std::shared_ptr<const Lease> l2) const
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{
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if (l1->tunnelID != l2->tunnelID)
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return l1->tunnelID < l2->tunnelID;
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else
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return l1->tunnelGateway < l2->tunnelGateway;
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};
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};
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typedef std::function<bool(const Lease & l)> LeaseInspectFunc;
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const size_t MAX_LS_BUFFER_SIZE = 3072;
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const size_t LEASE_SIZE = 44; // 32 + 4 + 8
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const size_t LEASE2_SIZE = 40; // 32 + 4 + 4
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const uint8_t MAX_NUM_LEASES = 16;
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const uint8_t NETDB_STORE_TYPE_LEASESET = 1;
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class LeaseSet: public RoutingDestination
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{
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public:
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LeaseSet (const uint8_t * buf, size_t len, bool storeLeases = true);
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virtual ~LeaseSet () { delete[] m_Buffer; };
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void Update (const uint8_t * buf, size_t len, bool verifySignature = true);
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bool IsNewer (const uint8_t * buf, size_t len) const;
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void PopulateLeases (); // from buffer
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const uint8_t * GetBuffer () const { return m_Buffer; };
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size_t GetBufferLen () const { return m_BufferLen; };
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bool IsValid () const { return m_IsValid; };
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const std::vector<std::shared_ptr<const Lease> > GetNonExpiredLeases (bool withThreshold = true) const;
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const std::vector<std::shared_ptr<const Lease> > GetNonExpiredLeasesExcluding (LeaseInspectFunc exclude, bool withThreshold = true) const;
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bool HasExpiredLeases () const;
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bool IsExpired () const;
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bool IsEmpty () const { return m_Leases.empty (); };
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uint64_t GetExpirationTime () const { return m_ExpirationTime; };
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bool ExpiresSoon(const uint64_t dlt=1000 * 5, const uint64_t fudge = 0) const ;
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bool operator== (const LeaseSet& other) const
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{ return m_BufferLen == other.m_BufferLen && !memcmp (m_Buffer, other.m_Buffer, m_BufferLen); };
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virtual uint8_t GetStoreType () const { return NETDB_STORE_TYPE_LEASESET; };
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// implements RoutingDestination
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std::shared_ptr<const IdentityEx> GetIdentity () const { return m_Identity; };
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void Encrypt (const uint8_t * data, uint8_t * encrypted, BN_CTX * ctx) const;
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bool IsDestination () const { return true; };
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protected:
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void UpdateLeasesBegin ();
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void UpdateLeasesEnd ();
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void UpdateLease (const Lease& lease, uint64_t ts);
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// called from LeaseSet2
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LeaseSet (bool storeLeases);
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void SetBuffer (const uint8_t * buf, size_t len);
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void SetIdentity (std::shared_ptr<const IdentityEx> identity) { m_Identity = identity; };
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void SetExpirationTime (uint64_t t) { m_ExpirationTime = t; };
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void SetIsValid (bool isValid) { m_IsValid = isValid; };
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bool IsStoreLeases () const { return m_StoreLeases; };
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private:
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void ReadFromBuffer (bool readIdentity = true, bool verifySignature = true);
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uint64_t ExtractTimestamp (const uint8_t * buf, size_t len) const; // returns max expiration time
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private:
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bool m_IsValid, m_StoreLeases; // we don't need to store leases for floodfill
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std::set<std::shared_ptr<Lease>, LeaseCmp> m_Leases;
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uint64_t m_ExpirationTime; // in milliseconds
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std::shared_ptr<const IdentityEx> m_Identity;
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uint8_t m_EncryptionKey[256];
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uint8_t * m_Buffer;
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size_t m_BufferLen;
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};
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/**
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validate lease set buffer signature and extract expiration timestamp
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@returns true if the leaseset is well formed and signature is valid
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*/
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bool LeaseSetBufferValidate(const uint8_t * ptr, size_t sz, uint64_t & expires);
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const uint8_t NETDB_STORE_TYPE_STANDARD_LEASESET2 = 3;
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const uint8_t NETDB_STORE_TYPE_ENCRYPTED_LEASESET2 = 5;
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const uint8_t NETDB_STORE_TYPE_META_LEASESET2 = 7;
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class LeaseSet2: public LeaseSet
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{
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public:
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LeaseSet2 (uint8_t storeType, const uint8_t * buf, size_t len, bool storeLeases = true);
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uint8_t GetStoreType () const { return m_StoreType; };
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// implements RoutingDestination
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void Encrypt (const uint8_t * data, uint8_t * encrypted, BN_CTX * ctx) const;
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private:
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void ReadFromBuffer (const uint8_t * buf, size_t len);
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void ReadFromBufferEncrypted (const uint8_t * buf, size_t len);
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size_t ReadStandardLS2TypeSpecificPart (const uint8_t * buf, size_t len);
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size_t ReadMetaLS2TypeSpecificPart (const uint8_t * buf, size_t len);
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template<typename Verifier>
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bool VerifySignature (Verifier& verifier, const uint8_t * buf, size_t len, size_t signatureOffset);
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private:
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uint8_t m_StoreType;
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std::shared_ptr<i2p::crypto::CryptoKeyEncryptor> m_Encryptor; // for standardLS2
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};
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class LocalLeaseSet
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{
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public:
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LocalLeaseSet (std::shared_ptr<const IdentityEx> identity, const uint8_t * encryptionPublicKey, std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> > tunnels);
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LocalLeaseSet (std::shared_ptr<const IdentityEx> identity, const uint8_t * buf, size_t len);
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virtual ~LocalLeaseSet () { delete[] m_Buffer; };
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virtual uint8_t * GetBuffer () const { return m_Buffer; };
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uint8_t * GetSignature () { return GetBuffer () + GetBufferLen () - GetSignatureLen (); };
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virtual size_t GetBufferLen () const { return m_BufferLen; };
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size_t GetSignatureLen () const { return m_Identity->GetSignatureLen (); };
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uint8_t * GetLeases () { return m_Leases; };
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const IdentHash& GetIdentHash () const { return m_Identity->GetIdentHash (); };
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bool IsExpired () const;
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uint64_t GetExpirationTime () const { return m_ExpirationTime; };
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void SetExpirationTime (uint64_t expirationTime) { m_ExpirationTime = expirationTime; };
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bool operator== (const LeaseSet& other) const
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{ return GetBufferLen () == other.GetBufferLen () && !memcmp (GetBuffer (), other.GetBuffer (), GetBufferLen ()); };
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virtual uint8_t GetStoreType () const { return NETDB_STORE_TYPE_LEASESET; };
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private:
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uint64_t m_ExpirationTime; // in milliseconds
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std::shared_ptr<const IdentityEx> m_Identity;
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uint8_t * m_Buffer, * m_Leases;
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size_t m_BufferLen;
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};
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class LocalLeaseSet2: public LocalLeaseSet
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{
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public:
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LocalLeaseSet2 (uint8_t storeType, std::shared_ptr<const IdentityEx> identity,
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uint16_t keyType, uint16_t keyLen, const uint8_t * encryptionPublicKey,
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std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> > tunnels);
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virtual ~LocalLeaseSet2 () { delete[] m_Buffer; };
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uint8_t * GetBuffer () const { return m_Buffer + 1; };
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size_t GetBufferLen () const { return m_BufferLen; };
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uint8_t GetStoreType () const { return m_Buffer[0]; };
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private:
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uint8_t * m_Buffer; // 1 byte store type + actual buffer
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size_t m_BufferLen;
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};
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}
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}
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#endif
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