I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include <stdio.h>
#include <string.h>
#include "I2PEndian.h"
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#include <fstream>
#include <boost/lexical_cast.hpp>
#include "version.h"
#include "Crypto.h"
#include "Base.h"
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#include "Timestamp.h"
#include "Log.h"
#include "NetDb.h"
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#include "RouterInfo.h"
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namespace i2p
{
namespace data
{
RouterInfo::RouterInfo (): m_Buffer (nullptr)
{
m_Addresses = std::make_shared<Addresses>(); // create empty list
}
RouterInfo::RouterInfo (const std::string& fullPath):
m_FullPath (fullPath), m_IsUpdated (false), m_IsUnreachable (false),
m_SupportedTransports (0), m_Caps (0)
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{
m_Addresses = std::make_shared<Addresses>(); // create empty list
m_Buffer = new uint8_t[MAX_RI_BUFFER_SIZE];
ReadFromFile ();
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}
RouterInfo::RouterInfo (const uint8_t * buf, int len):
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m_IsUpdated (true), m_IsUnreachable (false), m_SupportedTransports (0), m_Caps (0)
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{
m_Addresses = std::make_shared<Addresses>(); // create empty list
m_Buffer = new uint8_t[MAX_RI_BUFFER_SIZE];
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memcpy (m_Buffer, buf, len);
m_BufferLen = len;
ReadFromBuffer (true);
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}
RouterInfo::~RouterInfo ()
{
delete[] m_Buffer;
}
void RouterInfo::Update (const uint8_t * buf, int len)
{
// verify signature since we have indentity already
int l = len - m_RouterIdentity->GetSignatureLen ();
if (m_RouterIdentity->Verify (buf, l, buf + l))
{
// clean up
m_IsUpdated = true;
m_IsUnreachable = false;
m_SupportedTransports = 0;
m_Caps = 0;
// don't clean up m_Addresses, it will be replaced in ReadFromStream
m_Properties.clear ();
// copy buffer
if (!m_Buffer)
m_Buffer = new uint8_t[MAX_RI_BUFFER_SIZE];
memcpy (m_Buffer, buf, len);
m_BufferLen = len;
// skip identity
size_t identityLen = m_RouterIdentity->GetFullLen ();
// read new RI
std::stringstream str (std::string ((char *)m_Buffer + identityLen, m_BufferLen - identityLen));
ReadFromStream (str);
// don't delete buffer until saved to the file
}
else
{
LogPrint (eLogError, "RouterInfo: signature verification failed");
m_IsUnreachable = true;
}
}
void RouterInfo::SetRouterIdentity (std::shared_ptr<const IdentityEx> identity)
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{
m_RouterIdentity = identity;
m_Timestamp = i2p::util::GetMillisecondsSinceEpoch ();
}
bool RouterInfo::LoadFile ()
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{
std::ifstream s(m_FullPath, std::ifstream::binary);
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if (s.is_open ())
{
s.seekg (0,std::ios::end);
m_BufferLen = s.tellg ();
if (m_BufferLen < 40 || m_BufferLen > MAX_RI_BUFFER_SIZE)
{
LogPrint(eLogError, "RouterInfo: File", m_FullPath, " is malformed");
return false;
}
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s.seekg(0, std::ios::beg);
if (!m_Buffer)
m_Buffer = new uint8_t[MAX_RI_BUFFER_SIZE];
s.read((char *)m_Buffer, m_BufferLen);
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}
else
{
LogPrint (eLogError, "RouterInfo: Can't open file ", m_FullPath);
return false;
}
return true;
}
void RouterInfo::ReadFromFile ()
{
if (LoadFile ())
ReadFromBuffer (false);
else
m_IsUnreachable = true;
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}
void RouterInfo::ReadFromBuffer (bool verifySignature)
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{
m_RouterIdentity = std::make_shared<IdentityEx>(m_Buffer, m_BufferLen);
size_t identityLen = m_RouterIdentity->GetFullLen ();
if (identityLen >= m_BufferLen)
{
LogPrint (eLogError, "RouterInfo: identity length ", identityLen, " exceeds buffer size ", m_BufferLen);
m_IsUnreachable = true;
return;
}
if (verifySignature)
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{
// verify signature
int l = m_BufferLen - m_RouterIdentity->GetSignatureLen ();
if (l < 0 || !m_RouterIdentity->Verify ((uint8_t *)m_Buffer, l, (uint8_t *)m_Buffer + l))
{
LogPrint (eLogError, "RouterInfo: signature verification failed");
m_IsUnreachable = true;
return;
}
m_RouterIdentity->DropVerifier ();
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}
// parse RI
std::stringstream str;
str.write ((const char *)m_Buffer + identityLen, m_BufferLen - identityLen);
ReadFromStream (str);
if (!str)
{
LogPrint (eLogError, "RouterInfo: malformed message");
m_IsUnreachable = true;
}
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}
void RouterInfo::ReadFromStream (std::istream& s)
{
s.read ((char *)&m_Timestamp, sizeof (m_Timestamp));
m_Timestamp = be64toh (m_Timestamp);
// read addresses
auto addresses = std::make_shared<Addresses>();
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uint8_t numAddresses;
s.read ((char *)&numAddresses, sizeof (numAddresses)); if (!s) return;
bool introducers = false;
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for (int i = 0; i < numAddresses; i++)
{
uint8_t supportedTransports = 0;
bool isValidAddress = true;
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Address address;
s.read ((char *)&address.cost, sizeof (address.cost));
s.read ((char *)&address.date, sizeof (address.date));
char transportStyle[5];
ReadString (transportStyle, 5, s);
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if (!strcmp (transportStyle, "NTCP"))
address.transportStyle = eTransportNTCP;
else if (!strcmp (transportStyle, "SSU"))
address.transportStyle = eTransportSSU;
else
address.transportStyle = eTransportUnknown;
address.port = 0;
address.mtu = 0;
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uint16_t size, r = 0;
s.read ((char *)&size, sizeof (size)); if (!s) return;
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size = be16toh (size);
while (r < size)
{
char key[255], value[255];
r += ReadString (key, 255, s);
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s.seekg (1, std::ios_base::cur); r++; // =
r += ReadString (value, 255, s);
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s.seekg (1, std::ios_base::cur); r++; // ;
if (!s) return;
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if (!strcmp (key, "host"))
{
boost::system::error_code ecode;
address.host = boost::asio::ip::address::from_string (value, ecode);
if (ecode)
{
if (address.transportStyle == eTransportNTCP)
{
supportedTransports |= eNTCPV4; // TODO:
address.addressString = value;
}
else
{
supportedTransports |= eSSUV4; // TODO:
address.addressString = value;
}
}
else
{
// add supported protocol
if (address.host.is_v4 ())
supportedTransports |= (address.transportStyle == eTransportNTCP) ? eNTCPV4 : eSSUV4;
else
supportedTransports |= (address.transportStyle == eTransportNTCP) ? eNTCPV6 : eSSUV6;
}
}
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else if (!strcmp (key, "port"))
address.port = boost::lexical_cast<int>(value);
else if (!strcmp (key, "mtu"))
address.mtu = boost::lexical_cast<int>(value);
else if (!strcmp (key, "key"))
Base64ToByteStream (value, strlen (value), address.key, 32);
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else if (!strcmp (key, "caps"))
ExtractCaps (value);
else if (key[0] == 'i')
{
// introducers
introducers = true;
size_t l = strlen(key);
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unsigned char index = key[l-1] - '0'; // TODO:
key[l-1] = 0;
if (index > 9)
{
LogPrint (eLogError, "RouterInfo: Unexpected introducer's index ", index, " skipped");
if (s) continue; else return;
}
if (index >= address.introducers.size ())
address.introducers.resize (index + 1);
Introducer& introducer = address.introducers.at (index);
if (!strcmp (key, "ihost"))
{
boost::system::error_code ecode;
introducer.iHost = boost::asio::ip::address::from_string (value, ecode);
}
else if (!strcmp (key, "iport"))
introducer.iPort = boost::lexical_cast<int>(value);
else if (!strcmp (key, "itag"))
introducer.iTag = boost::lexical_cast<uint32_t>(value);
else if (!strcmp (key, "ikey"))
Base64ToByteStream (value, strlen (value), introducer.iKey, 32);
}
if (!s) return;
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}
if (isValidAddress)
{
addresses->push_back(std::make_shared<Address>(address));
m_SupportedTransports |= supportedTransports;
}
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}
m_Addresses = addresses;
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// read peers
uint8_t numPeers;
s.read ((char *)&numPeers, sizeof (numPeers)); if (!s) return;
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s.seekg (numPeers*32, std::ios_base::cur); // TODO: read peers
// read properties
uint16_t size, r = 0;
s.read ((char *)&size, sizeof (size)); if (!s) return;
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size = be16toh (size);
while (r < size)
{
char key[255], value[255];
r += ReadString (key, 255, s);
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s.seekg (1, std::ios_base::cur); r++; // =
r += ReadString (value, 255, s);
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s.seekg (1, std::ios_base::cur); r++; // ;
if (!s) return;
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m_Properties[key] = value;
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// extract caps
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if (!strcmp (key, "caps"))
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ExtractCaps (value);
// check netId
else if (!strcmp (key, ROUTER_INFO_PROPERTY_NETID) && atoi (value) != I2PD_NET_ID)
{
LogPrint (eLogError, "RouterInfo: Unexpected ", ROUTER_INFO_PROPERTY_NETID, "=", value);
m_IsUnreachable = true;
}
// family
else if (!strcmp (key, ROUTER_INFO_PROPERTY_FAMILY))
{
m_Family = value;
boost::to_lower (m_Family);
}
else if (!strcmp (key, ROUTER_INFO_PROPERTY_FAMILY_SIG))
{
if (!netdb.GetFamilies ().VerifyFamily (m_Family, GetIdentHash (), value))
{
LogPrint (eLogWarning, "RouterInfo: family signature verification failed");
m_Family.clear ();
}
}
if (!s) return;
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}
if (!m_SupportedTransports || !m_Addresses->size() || (UsesIntroducer () && !introducers))
SetUnreachable (true);
}
bool RouterInfo::IsFamily(const std::string & fam) const {
return m_Family == fam;
}
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void RouterInfo::ExtractCaps (const char * value)
{
const char * cap = value;
while (*cap)
{
switch (*cap)
{
case CAPS_FLAG_FLOODFILL:
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m_Caps |= Caps::eFloodfill;
break;
case CAPS_FLAG_HIGH_BANDWIDTH1:
case CAPS_FLAG_HIGH_BANDWIDTH2:
case CAPS_FLAG_HIGH_BANDWIDTH3:
m_Caps |= Caps::eHighBandwidth;
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break;
case CAPS_FLAG_EXTRA_BANDWIDTH1:
case CAPS_FLAG_EXTRA_BANDWIDTH2:
m_Caps |= Caps::eExtraBandwidth;
break;
case CAPS_FLAG_HIDDEN:
m_Caps |= Caps::eHidden;
break;
case CAPS_FLAG_REACHABLE:
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m_Caps |= Caps::eReachable;
break;
case CAPS_FLAG_UNREACHABLE:
m_Caps |= Caps::eUnreachable;
break;
case CAPS_FLAG_SSU_TESTING:
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m_Caps |= Caps::eSSUTesting;
break;
case CAPS_FLAG_SSU_INTRODUCER:
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m_Caps |= Caps::eSSUIntroducer;
break;
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default: ;
}
cap++;
}
}
void RouterInfo::UpdateCapsProperty ()
{
std::string caps;
if (m_Caps & eFloodfill)
{
if (m_Caps & eExtraBandwidth) caps += CAPS_FLAG_EXTRA_BANDWIDTH1; // 'P'
caps += CAPS_FLAG_HIGH_BANDWIDTH3; // 'O'
caps += CAPS_FLAG_FLOODFILL; // floodfill
}
else
{
if (m_Caps & eExtraBandwidth) caps += CAPS_FLAG_EXTRA_BANDWIDTH1; // 'P'
caps += (m_Caps & eHighBandwidth) ? CAPS_FLAG_HIGH_BANDWIDTH3 /* 'O' */: CAPS_FLAG_LOW_BANDWIDTH2 /* 'L' */; // bandwidth
}
if (m_Caps & eHidden) caps += CAPS_FLAG_HIDDEN; // hidden
if (m_Caps & eReachable) caps += CAPS_FLAG_REACHABLE; // reachable
if (m_Caps & eUnreachable) caps += CAPS_FLAG_UNREACHABLE; // unreachable
SetProperty ("caps", caps);
}
void RouterInfo::WriteToStream (std::ostream& s) const
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{
uint64_t ts = htobe64 (m_Timestamp);
s.write ((const char *)&ts, sizeof (ts));
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// addresses
uint8_t numAddresses = m_Addresses->size ();
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s.write ((char *)&numAddresses, sizeof (numAddresses));
for (const auto& addr_ptr : *m_Addresses)
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{
const Address& address = *addr_ptr;
s.write ((const char *)&address.cost, sizeof (address.cost));
s.write ((const char *)&address.date, sizeof (address.date));
std::stringstream properties;
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if (address.transportStyle == eTransportNTCP)
WriteString ("NTCP", s);
else if (address.transportStyle == eTransportSSU)
{
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WriteString ("SSU", s);
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// caps
WriteString ("caps", properties);
properties << '=';
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std::string caps;
if (IsPeerTesting ()) caps += CAPS_FLAG_SSU_TESTING;
if (IsIntroducer ()) caps += CAPS_FLAG_SSU_INTRODUCER;
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WriteString (caps, properties);
properties << ';';
}
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else
WriteString ("", s);
WriteString ("host", properties);
properties << '=';
WriteString (address.host.to_string (), properties);
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properties << ';';
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if (address.transportStyle == eTransportSSU)
{
// write introducers if any
if (address.introducers.size () > 0)
{
int i = 0;
for (const auto& introducer: address.introducers)
{
WriteString ("ihost" + boost::lexical_cast<std::string>(i), properties);
properties << '=';
WriteString (introducer.iHost.to_string (), properties);
properties << ';';
i++;
}
i = 0;
for (const auto& introducer: address.introducers)
{
WriteString ("ikey" + boost::lexical_cast<std::string>(i), properties);
properties << '=';
char value[64];
size_t l = ByteStreamToBase64 (introducer.iKey, 32, value, 64);
value[l] = 0;
WriteString (value, properties);
properties << ';';
i++;
}
i = 0;
for (const auto& introducer: address.introducers)
{
WriteString ("iport" + boost::lexical_cast<std::string>(i), properties);
properties << '=';
WriteString (boost::lexical_cast<std::string>(introducer.iPort), properties);
properties << ';';
i++;
}
i = 0;
for (const auto& introducer: address.introducers)
{
WriteString ("itag" + boost::lexical_cast<std::string>(i), properties);
properties << '=';
WriteString (boost::lexical_cast<std::string>(introducer.iTag), properties);
properties << ';';
i++;
}
}
// write intro key
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WriteString ("key", properties);
properties << '=';
char value[64];
size_t l = ByteStreamToBase64 (address.key, 32, value, 64);
value[l] = 0;
WriteString (value, properties);
properties << ';';
// write mtu
if (address.mtu)
{
WriteString ("mtu", properties);
properties << '=';
WriteString (boost::lexical_cast<std::string>(address.mtu), properties);
properties << ';';
}
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}
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WriteString ("port", properties);
properties << '=';
WriteString (boost::lexical_cast<std::string>(address.port), properties);
properties << ';';
uint16_t size = htobe16 (properties.str ().size ());
s.write ((char *)&size, sizeof (size));
s.write (properties.str ().c_str (), properties.str ().size ());
}
// peers
uint8_t numPeers = 0;
s.write ((char *)&numPeers, sizeof (numPeers));
// properties
std::stringstream properties;
for (const auto& p : m_Properties)
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{
WriteString (p.first, properties);
properties << '=';
WriteString (p.second, properties);
properties << ';';
}
uint16_t size = htobe16 (properties.str ().size ());
s.write ((char *)&size, sizeof (size));
s.write (properties.str ().c_str (), properties.str ().size ());
}
bool RouterInfo::IsNewer (const uint8_t * buf, size_t len) const
{
if (!m_RouterIdentity) return false;
size_t size = m_RouterIdentity->GetFullLen ();
if (size + 8 > len) return false;
return bufbe64toh (buf + size) > m_Timestamp;
}
const uint8_t * RouterInfo::LoadBuffer ()
{
if (!m_Buffer)
{
if (LoadFile ())
LogPrint (eLogDebug, "RouterInfo: Buffer for ", GetIdentHashAbbreviation (GetIdentHash ()), " loaded from file");
}
return m_Buffer;
}
void RouterInfo::CreateBuffer (const PrivateKeys& privateKeys)
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{
m_Timestamp = i2p::util::GetMillisecondsSinceEpoch (); // refresh timstamp
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std::stringstream s;
uint8_t ident[1024];
auto identLen = privateKeys.GetPublic ()->ToBuffer (ident, 1024);
s.write ((char *)ident, identLen);
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WriteToStream (s);
m_BufferLen = s.str ().size ();
if (!m_Buffer)
m_Buffer = new uint8_t[MAX_RI_BUFFER_SIZE];
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memcpy (m_Buffer, s.str ().c_str (), m_BufferLen);
// signature
privateKeys.Sign ((uint8_t *)m_Buffer, m_BufferLen, (uint8_t *)m_Buffer + m_BufferLen);
m_BufferLen += privateKeys.GetPublic ()->GetSignatureLen ();
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}
bool RouterInfo::SaveToFile (const std::string& fullPath)
{
m_FullPath = fullPath;
if (!m_Buffer) {
LogPrint (eLogError, "RouterInfo: Can't save, m_Buffer == NULL");
return false;
}
std::ofstream f (fullPath, std::ofstream::binary | std::ofstream::out);
if (!f.is_open ()) {
LogPrint(eLogError, "RouterInfo: Can't save to ", fullPath);
return false;
}
f.write ((char *)m_Buffer, m_BufferLen);
return true;
}
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size_t RouterInfo::ReadString (char * str, size_t len, std::istream& s) const
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{
uint8_t l;
s.read ((char *)&l, 1);
if (l < len)
{
s.read (str, l);
if (!s) l = 0; // failed, return empty string
str[l] = 0;
}
else
{
LogPrint (eLogWarning, "RouterInfo: string length ", (int)l, " exceeds buffer size ", len);
s.seekg (l, std::ios::cur); // skip
str[0] = 0;
}
return l+1;
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}
void RouterInfo::WriteString (const std::string& str, std::ostream& s) const
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{
uint8_t len = str.size ();
s.write ((char *)&len, 1);
s.write (str.c_str (), len);
}
void RouterInfo::AddNTCPAddress (const char * host, int port)
{
auto addr = std::make_shared<Address>();
addr->host = boost::asio::ip::address::from_string (host);
addr->port = port;
addr->transportStyle = eTransportNTCP;
addr->cost = 2;
addr->date = 0;
addr->mtu = 0;
for (const auto& it: *m_Addresses) // don't insert same address twice
if (*it == *addr) return;
m_SupportedTransports |= addr->host.is_v6 () ? eNTCPV6 : eNTCPV4;
m_Addresses->push_back(std::move(addr));
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}
void RouterInfo::AddSSUAddress (const char * host, int port, const uint8_t * key, int mtu)
{
auto addr = std::make_shared<Address>();
addr->host = boost::asio::ip::address::from_string (host);
addr->port = port;
addr->transportStyle = eTransportSSU;
addr->cost = 10; // NTCP should have priority over SSU
addr->date = 0;
addr->mtu = mtu;
memcpy (addr->key, key, 32);
for (const auto& it: *m_Addresses) // don't insert same address twice
if (*it == *addr) return;
m_SupportedTransports |= addr->host.is_v6 () ? eSSUV6 : eSSUV4;
m_Addresses->push_back(std::move(addr));
m_Caps |= eSSUTesting;
m_Caps |= eSSUIntroducer;
}
bool RouterInfo::AddIntroducer (const Introducer& introducer)
{
for (auto& addr : *m_Addresses)
{
if (addr->transportStyle == eTransportSSU && addr->host.is_v4 ())
{
for (auto& intro: addr->introducers)
if (intro.iTag == introducer.iTag) return false; // already presented
addr->introducers.push_back (introducer);
return true;
}
}
return false;
}
bool RouterInfo::RemoveIntroducer (const boost::asio::ip::udp::endpoint& e)
{
for (auto& addr: *m_Addresses)
{
if (addr->transportStyle == eTransportSSU && addr->host.is_v4 ())
{
for (auto it = addr->introducers.begin (); it != addr->introducers.end (); ++it)
if ( boost::asio::ip::udp::endpoint (it->iHost, it->iPort) == e)
{
addr->introducers.erase (it);
return true;
}
}
}
return false;
}
void RouterInfo::SetCaps (uint8_t caps)
{
m_Caps = caps;
UpdateCapsProperty ();
}
void RouterInfo::SetCaps (const char * caps)
{
SetProperty ("caps", caps);
m_Caps = 0;
ExtractCaps (caps);
}
void RouterInfo::SetProperty (const std::string& key, const std::string& value)
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{
m_Properties[key] = value;
}
void RouterInfo::DeleteProperty (const std::string& key)
{
m_Properties.erase (key);
}
std::string RouterInfo::GetProperty (const std::string& key) const
{
auto it = m_Properties.find (key);
if (it != m_Properties.end ())
return it->second;
return "";
}
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bool RouterInfo::IsNTCP (bool v4only) const
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{
if (v4only)
return m_SupportedTransports & eNTCPV4;
else
return m_SupportedTransports & (eNTCPV4 | eNTCPV6);
}
bool RouterInfo::IsSSU (bool v4only) const
{
if (v4only)
return m_SupportedTransports & eSSUV4;
else
return m_SupportedTransports & (eSSUV4 | eSSUV6);
}
bool RouterInfo::IsV6 () const
{
return m_SupportedTransports & (eNTCPV6 | eSSUV6);
}
bool RouterInfo::IsV4 () const
{
return m_SupportedTransports & (eNTCPV4 | eSSUV4);
}
void RouterInfo::EnableV6 ()
{
if (!IsV6 ())
m_SupportedTransports |= eNTCPV6 | eSSUV6;
}
void RouterInfo::EnableV4 ()
{
if (!IsV4 ())
m_SupportedTransports |= eNTCPV4 | eSSUV4;
}
void RouterInfo::DisableV6 ()
{
if (IsV6 ())
{
m_SupportedTransports &= ~(eNTCPV6 | eSSUV6);
for (auto it = m_Addresses->begin (); it != m_Addresses->end ();)
{
auto addr = *it;
if (addr->host.is_v6 ())
it = m_Addresses->erase (it);
else
++it;
}
}
}
void RouterInfo::DisableV4 ()
{
if (IsV4 ())
{
m_SupportedTransports &= ~(eNTCPV4 | eSSUV4);
for (auto it = m_Addresses->begin (); it != m_Addresses->end ();)
{
auto addr = *it;
if (addr->host.is_v4 ())
it = m_Addresses->erase (it);
else
++it;
}
}
}
bool RouterInfo::UsesIntroducer () const
{
return m_Caps & Caps::eUnreachable; // non-reachable
}
std::shared_ptr<const RouterInfo::Address> RouterInfo::GetNTCPAddress (bool v4only) const
{
return GetAddress (eTransportNTCP, v4only);
}
std::shared_ptr<const RouterInfo::Address> RouterInfo::GetSSUAddress (bool v4only) const
{
return GetAddress (eTransportSSU, v4only);
}
std::shared_ptr<const RouterInfo::Address> RouterInfo::GetSSUV6Address () const
{
return GetAddress (eTransportSSU, false, true);
}
std::shared_ptr<const RouterInfo::Address> RouterInfo::GetAddress (TransportStyle s, bool v4only, bool v6only) const
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{
auto addresses = m_Addresses;
for (const auto& address : *addresses)
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{
if (address->transportStyle == s)
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{
if ((!v4only || address->host.is_v4 ()) && (!v6only || address->host.is_v6 ()))
return address;
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}
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}
return nullptr;
}
std::shared_ptr<RouterProfile> RouterInfo::GetProfile () const
{
if (!m_Profile)
m_Profile = GetRouterProfile (GetIdentHash ());
return m_Profile;
}
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}
}