I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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/*
* Copyright (c) 2013-2024, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*/
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#ifndef ROUTER_INFO_H__
#define ROUTER_INFO_H__
#include <inttypes.h>
#include <string>
#include <map>
#include <vector>
#include <array>
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#include <iostream>
#include <boost/asio.hpp>
#include <boost/shared_ptr.hpp>
#include "Identity.h"
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#include "Profiling.h"
#include "Family.h"
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namespace i2p
{
namespace data
{
const char ROUTER_INFO_PROPERTY_LEASESETS[] = "netdb.knownLeaseSets";
const char ROUTER_INFO_PROPERTY_ROUTERS[] = "netdb.knownRouters";
const char ROUTER_INFO_PROPERTY_NETID[] = "netId";
const char ROUTER_INFO_PROPERTY_VERSION[] = "router.version";
const char ROUTER_INFO_PROPERTY_FAMILY[] = "family";
const char ROUTER_INFO_PROPERTY_FAMILY_SIG[] = "family.sig";
const char CAPS_FLAG_FLOODFILL = 'f';
const char CAPS_FLAG_HIDDEN = 'H';
const char CAPS_FLAG_REACHABLE = 'R';
const char CAPS_FLAG_UNREACHABLE = 'U';
/* bandwidth flags */
const char CAPS_FLAG_LOW_BANDWIDTH1 = 'K'; /* < 12 KBps */
const char CAPS_FLAG_LOW_BANDWIDTH2 = 'L'; /* 12-48 KBps */
const char CAPS_FLAG_LOW_BANDWIDTH3 = 'M'; /* 48-64 KBps */
const char CAPS_FLAG_LOW_BANDWIDTH4 = 'N'; /* 64-128 KBps */
const char CAPS_FLAG_HIGH_BANDWIDTH = 'O'; /* 128-256 KBps */
const char CAPS_FLAG_EXTRA_BANDWIDTH1 = 'P'; /* 256-2048 KBps */
const char CAPS_FLAG_EXTRA_BANDWIDTH2 = 'X'; /* > 2048 KBps */
// bandwidth limits in kBps
const uint32_t LOW_BANDWIDTH_LIMIT = 48;
const uint32_t HIGH_BANDWIDTH_LIMIT = 256;
const uint32_t EXTRA_BANDWIDTH_LIMIT = 2048;
// congesion flags
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const char CAPS_FLAG_MEDIUM_CONGESTION = 'D';
const char CAPS_FLAG_HIGH_CONGESTION = 'E';
const char CAPS_FLAG_REJECT_ALL_CONGESTION = 'G';
const char CAPS_FLAG_V4 = '4';
const char CAPS_FLAG_V6 = '6';
const char CAPS_FLAG_SSU2_TESTING = 'B';
const char CAPS_FLAG_SSU2_INTRODUCER = 'C';
const uint8_t COST_NTCP2_PUBLISHED = 3;
const uint8_t COST_NTCP2_NON_PUBLISHED = 14;
const uint8_t COST_SSU2_DIRECT = 8;
const uint8_t COST_SSU2_NON_PUBLISHED = 15;
const size_t MAX_RI_BUFFER_SIZE = 3072; // if RouterInfo exceeds 3K we consider it as malformed, might extend later
const int HIGH_CONGESTION_INTERVAL = 15*60; // in seconds, 15 minutes
const int INTRODUCER_UPDATE_INTERVAL = 20*60*1000; // in milliseconds, 20 minutes
class RouterInfo: public RoutingDestination
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{
public:
enum SupportedTransportsIdx
{
eNTCP2V4Idx = 0,
eNTCP2V6Idx,
eSSU2V4Idx,
eSSU2V6Idx,
eNTCP2V6MeshIdx,
eNumTransports
};
#define TransportBit(tr) e##tr = (1 << e##tr##Idx)
enum SupportedTransports
{
TransportBit(NTCP2V4), // 0x01
TransportBit(NTCP2V6), // 0x02
TransportBit(SSU2V4), // 0x04
TransportBit(SSU2V6), // 0x08
TransportBit(NTCP2V6Mesh), // 0x10
eAllTransports = 0xFF
};
typedef uint8_t CompatibleTransports;
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enum Caps
{
eFloodfill = 0x01,
eHighBandwidth = 0x02,
eExtraBandwidth = 0x04,
eReachable = 0x08,
eHidden = 0x10,
eUnreachable = 0x20
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};
enum Congestion
{
eLowCongestion = 0,
eMediumCongestion,
eHighCongestion,
eRejectAll
};
enum AddressCaps
{
eV4 = 0x01,
eV6 = 0x02,
eSSUTesting = 0x04,
eSSUIntroducer = 0x08
};
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enum TransportStyle
{
eTransportUnknown = 0,
eTransportNTCP2,
eTransportSSU2
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};
struct Introducer
{
Introducer (): iTag (0), iExp (0) { iH.Fill(0); };
IdentHash iH;
uint32_t iTag;
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uint32_t iExp;
};
struct SSUExt
{
int mtu;
std::vector<Introducer> introducers;
};
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struct Address
{
TransportStyle transportStyle;
boost::asio::ip::address host;
Tag<32> s, i; // keys, i is first 16 bytes for NTCP2 and 32 bytes intro key for SSU
int port;
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uint64_t date;
uint8_t caps;
bool published = false;
std::unique_ptr<SSUExt> ssu; // not null for SSU
bool IsCompatible (const boost::asio::ip::address& other) const
{
return (IsV4 () && other.is_v4 ()) ||
(IsV6 () && other.is_v6 ());
}
bool operator==(const Address& other) const
{
return transportStyle == other.transportStyle &&
host == other.host && port == other.port;
}
bool operator!=(const Address& other) const
{
return !(*this == other);
}
bool IsNTCP2 () const { return transportStyle == eTransportNTCP2; };
bool IsSSU2 () const { return transportStyle == eTransportSSU2; };
bool IsPublishedNTCP2 () const { return IsNTCP2 () && published; };
bool IsReachableSSU () const { return (bool)ssu && (published || UsesIntroducer ()); };
bool UsesIntroducer () const { return (bool)ssu && !ssu->introducers.empty (); };
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bool IsIntroducer () const { return caps & eSSUIntroducer; };
bool IsPeerTesting () const { return caps & eSSUTesting; };
bool IsV4 () const { return (caps & AddressCaps::eV4) || (host.is_v4 () && !host.is_unspecified ()); };
bool IsV6 () const { return (caps & AddressCaps::eV6) || (host.is_v6 () && !host.is_unspecified ()); };
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};
class Buffer: public std::array<uint8_t, MAX_RI_BUFFER_SIZE>
{
public:
Buffer () = default;
Buffer (const uint8_t * buf, size_t len);
Buffer (const Buffer& other): Buffer (other.data (), other.m_BufferLen) {};
size_t GetBufferLen () const { return m_BufferLen; };
void SetBufferLen (size_t len) { m_BufferLen = len; };
private:
size_t m_BufferLen = 0;
};
typedef std::array<std::shared_ptr<Address>, eNumTransports> Addresses;
RouterInfo (const std::string& fullPath);
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RouterInfo (const RouterInfo& ) = default;
RouterInfo& operator=(const RouterInfo& ) = default;
RouterInfo (std::shared_ptr<Buffer>&& buf, size_t len);
RouterInfo (const uint8_t * buf, size_t len);
virtual ~RouterInfo ();
std::shared_ptr<const IdentityEx> GetRouterIdentity () const { return m_RouterIdentity; };
void SetRouterIdentity (std::shared_ptr<const IdentityEx> identity);
std::string GetIdentHashBase64 () const { return GetIdentHash ().ToBase64 (); };
uint64_t GetTimestamp () const { return m_Timestamp; };
int GetVersion () const { return m_Version; };
virtual void SetProperty (const std::string& key, const std::string& value) {};
virtual void ClearProperties () {};
boost::shared_ptr<Addresses> GetAddresses () const; // should be called for local RI only, otherwise must return shared_ptr
std::shared_ptr<const Address> GetNTCP2V4Address () const;
std::shared_ptr<const Address> GetNTCP2V6Address () const;
std::shared_ptr<const Address> GetPublishedNTCP2V4Address () const;
std::shared_ptr<const Address> GetPublishedNTCP2V6Address () const;
std::shared_ptr<const Address> GetYggdrasilAddress () const;
std::shared_ptr<const Address> GetSSU2V4Address () const;
std::shared_ptr<const Address> GetSSU2V6Address () const;
std::shared_ptr<const Address> GetSSU2Address (bool v4) const;
void AddNTCP2Address (const uint8_t * staticKey, const uint8_t * iv,int port, uint8_t caps); // non published
void AddNTCP2Address (const uint8_t * staticKey, const uint8_t * iv,
const boost::asio::ip::address& host, int port); // published
void RemoveNTCP2Address (bool v4);
void AddSSU2Address (const uint8_t * staticKey, const uint8_t * introKey, int port, uint8_t caps); // non published
void AddSSU2Address (const uint8_t * staticKey, const uint8_t * introKey,
const boost::asio::ip::address& host, int port); // published
void RemoveSSU2Address (bool v4);
void SetUnreachableAddressesTransportCaps (uint8_t transports); // bitmask of AddressCaps
void UpdateSupportedTransports ();
void UpdateIntroducers (uint64_t ts); // ts in seconds
bool IsFloodfill () const { return m_IsFloodfill; };
void SetFloodfill () { m_IsFloodfill = true; };
void ResetFloodfill () { m_IsFloodfill = false; };
bool IsECIES () const { return m_RouterIdentity->GetCryptoKeyType () == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD; };
bool IsNTCP2 (bool v4only = true) const;
bool IsNTCP2V6 () const { return m_SupportedTransports & eNTCP2V6; };
bool IsSSU2V4 () const { return m_SupportedTransports & eSSU2V4; };
bool IsSSU2V6 () const { return m_SupportedTransports & eSSU2V6; };
bool IsV6 () const { return m_SupportedTransports & (eNTCP2V6 | eSSU2V6); };
bool IsV4 () const { return m_SupportedTransports & (eNTCP2V4 | eSSU2V4); };
bool IsMesh () const { return m_SupportedTransports & eNTCP2V6Mesh; };
void EnableV6 ();
void DisableV6 ();
void EnableV4 ();
void DisableV4 ();
void EnableMesh ();
void DisableMesh ();
bool IsCompatible (const RouterInfo& other) const { return m_SupportedTransports & other.m_SupportedTransports; };
bool IsReachableFrom (const RouterInfo& other) const { return m_ReachableTransports & other.m_SupportedTransports; };
bool IsReachableBy (CompatibleTransports transports) const { return m_ReachableTransports & transports; };
CompatibleTransports GetCompatibleTransports (bool incoming) const { return incoming ? m_ReachableTransports : m_SupportedTransports; };
CompatibleTransports GetPublishedTransports () const { return m_PublishedTransports; };
bool HasValidAddresses () const { return m_SupportedTransports; };
bool IsHidden () const { return m_Caps & eHidden; };
bool IsHighBandwidth () const { return m_Caps & RouterInfo::eHighBandwidth; };
bool IsExtraBandwidth () const { return m_Caps & RouterInfo::eExtraBandwidth; };
bool IsEligibleFloodfill () const;
bool IsDeclaredFloodfill () const { return m_Caps & RouterInfo::eFloodfill; };
bool IsPublished (bool v4) const;
bool IsPublishedOn (CompatibleTransports transports) const;
bool IsNAT2NATOnly (const RouterInfo& other) const; // only NAT-to-NAT connection is possible
bool IsSSU2PeerTesting (bool v4) const;
bool IsSSU2Introducer (bool v4) const;
bool IsHighCongestion (bool highBandwidth) const;
uint8_t GetCaps () const { return m_Caps; };
char GetBandwidthCap() const { return m_BandwidthCap; };
void SetCaps (uint8_t caps) { m_Caps = caps; };
Congestion GetCongestion () const { return m_Congestion; };
void SetUnreachable (bool unreachable) { m_IsUnreachable = unreachable; };
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bool IsUnreachable () const { return m_IsUnreachable; };
void ExcludeReachableTransports (CompatibleTransports transports) { m_ReachableTransports &= ~transports; };
const uint8_t * GetBuffer () const { return m_Buffer ? m_Buffer->data () : nullptr; };
const uint8_t * LoadBuffer (const std::string& fullPath); // load if necessary
size_t GetBufferLen () const { return m_Buffer ? m_Buffer->GetBufferLen () : 0; };
void DeleteBuffer () { m_Buffer = nullptr; };
std::shared_ptr<Buffer> GetSharedBuffer () const { return m_Buffer; };
std::shared_ptr<Buffer> CopyBuffer () const;
bool IsUpdated () const { return m_IsUpdated; };
void SetUpdated (bool updated) { m_IsUpdated = updated; };
bool SaveToFile (const std::string& fullPath);
static bool SaveToFile (const std::string& fullPath, std::shared_ptr<Buffer> buf);
std::shared_ptr<RouterProfile> GetProfile () const;
void DropProfile () { m_Profile = nullptr; };
bool HasProfile () const { return (bool)m_Profile; };
bool Update (const uint8_t * buf, size_t len);
bool IsNewer (const uint8_t * buf, size_t len) const;
/** return true if we are in a router family and the signature is valid */
bool IsFamily (FamilyID famid) const;
// implements RoutingDestination
std::shared_ptr<const IdentityEx> GetIdentity () const { return m_RouterIdentity; };
void Encrypt (const uint8_t * data, uint8_t * encrypted) const;
bool IsDestination () const { return false; };
protected:
RouterInfo ();
uint8_t * GetBufferPointer (size_t offset = 0 ) { return m_Buffer->data () + offset; };
void UpdateBuffer (const uint8_t * buf, size_t len);
void SetBufferLen (size_t len) { if (m_Buffer) m_Buffer->SetBufferLen (len); };
void RefreshTimestamp ();
CompatibleTransports GetReachableTransports () const { return m_ReachableTransports; };
void SetReachableTransports (CompatibleTransports transports) { m_ReachableTransports = transports; };
void SetCongestion (Congestion c) { m_Congestion = c; };
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private:
bool LoadFile (const std::string& fullPath);
void ReadFromFile (const std::string& fullPath);
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void ReadFromStream (std::istream& s);
void ReadFromBuffer (bool verifySignature);
size_t ReadString (char* str, size_t len, std::istream& s) const;
void ExtractCaps (const char * value);
uint8_t ExtractAddressCaps (const char * value) const;
void UpdateIntroducers (std::shared_ptr<Address> address, uint64_t ts);
template<typename Filter>
std::shared_ptr<const Address> GetAddress (Filter filter) const;
virtual std::shared_ptr<Buffer> NewBuffer () const;
virtual std::shared_ptr<Address> NewAddress () const;
virtual boost::shared_ptr<Addresses> NewAddresses () const;
virtual std::shared_ptr<IdentityEx> NewIdentity (const uint8_t * buf, size_t len) const;
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private:
FamilyID m_FamilyID;
std::shared_ptr<const IdentityEx> m_RouterIdentity;
std::shared_ptr<Buffer> m_Buffer;
uint64_t m_Timestamp; // in milliseconds
boost::shared_ptr<Addresses> m_Addresses; // TODO: use std::shared_ptr and std::atomic_store for gcc >= 4.9
bool m_IsUpdated, m_IsUnreachable, m_IsFloodfill;
CompatibleTransports m_SupportedTransports, m_ReachableTransports, m_PublishedTransports;
uint8_t m_Caps;
char m_BandwidthCap;
int m_Version;
Congestion m_Congestion;
mutable std::shared_ptr<RouterProfile> m_Profile;
};
class LocalRouterInfo: public RouterInfo
{
public:
LocalRouterInfo () = default;
void CreateBuffer (const PrivateKeys& privateKeys);
void UpdateCaps (uint8_t caps);
bool UpdateCongestion (Congestion c); // returns true if updated
void SetProperty (const std::string& key, const std::string& value) override;
void DeleteProperty (const std::string& key);
std::string GetProperty (const std::string& key) const;
void ClearProperties () override { m_Properties.clear (); };
void UpdateFloodfillProperty (bool floodfill);
bool AddSSU2Introducer (const Introducer& introducer, bool v4);
bool RemoveSSU2Introducer (const IdentHash& h, bool v4);
private:
void WriteToStream (std::ostream& s) const;
void UpdateCapsProperty ();
void WriteString (const std::string& str, std::ostream& s) const;
std::shared_ptr<Buffer> NewBuffer () const override;
std::shared_ptr<Address> NewAddress () const override;
boost::shared_ptr<Addresses> NewAddresses () const override;
std::shared_ptr<IdentityEx> NewIdentity (const uint8_t * buf, size_t len) const override;
private:
std::map<std::string, std::string> m_Properties;
};
}
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}
#endif