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 <cryptopp/sha.h>
#include <cryptopp/dsa.h>
#include "CryptoConst.h"
#include "base64.h"
#include "Timestamp.h"
#include "Log.h"
#include "RouterInfo.h"
#include "RouterContext.h"
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namespace i2p
{
namespace data
{
RouterInfo::RouterInfo (const char * filename):
m_IsUpdated (false), m_IsUnreachable (false), m_SupportedTransports (0)
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{
ReadFromFile (filename);
}
RouterInfo::RouterInfo (const uint8_t * buf, int len):
m_IsUpdated (true), m_IsUnreachable (false), m_SupportedTransports (0)
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{
memcpy (m_Buffer, buf, len);
m_BufferLen = len;
ReadFromBuffer ();
}
void RouterInfo::SetRouterIdentity (const Identity& identity)
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{
m_RouterIdentity = identity;
m_IdentHash = CalculateIdentHash (m_RouterIdentity);
UpdateIdentHashBase64 ();
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UpdateRoutingKey ();
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m_Timestamp = i2p::util::GetMillisecondsSinceEpoch ();
}
void RouterInfo::ReadFromFile (const char * filename)
{
std::ifstream s(filename, 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)
{
LogPrint("File", filename, " is malformed");
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return;
}
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s.seekg(0, std::ios::beg);
s.read(m_Buffer,m_BufferLen);
ReadFromBuffer ();
}
else
LogPrint ("Can't open file ", filename);
}
void RouterInfo::ReadFromBuffer ()
{
std::stringstream str (std::string (m_Buffer, m_BufferLen));
ReadFromStream (str);
// verify signature
CryptoPP::DSA::PublicKey pubKey;
pubKey.Initialize (i2p::crypto::dsap, i2p::crypto::dsaq, i2p::crypto::dsag, CryptoPP::Integer (m_RouterIdentity.signingKey, 128));
CryptoPP::DSA::Verifier verifier (pubKey);
int l = m_BufferLen - 40;
if (!verifier.VerifyMessage ((uint8_t *)m_Buffer, l, (uint8_t *)m_Buffer + l, 40))
{
LogPrint ("signature verification failed");
}
}
void RouterInfo::ReadFromStream (std::istream& s)
{
s.read ((char *)&m_RouterIdentity, sizeof (m_RouterIdentity));
s.read ((char *)&m_Timestamp, sizeof (m_Timestamp));
m_Timestamp = be64toh (m_Timestamp);
// read addresses
uint8_t numAddresses;
s.read ((char *)&numAddresses, sizeof (numAddresses));
for (int i = 0; i < numAddresses; i++)
{
Address address;
s.read ((char *)&address.cost, sizeof (address.cost));
s.read ((char *)&address.date, sizeof (address.date));
char transportStyle[5];
ReadString (transportStyle, s);
if (!strcmp (transportStyle, "NTCP"))
address.transportStyle = eTransportNTCP;
else if (!strcmp (transportStyle, "SSU"))
address.transportStyle = eTransportSSU;
else
address.transportStyle = eTransportUnknown;
uint16_t size, r = 0;
s.read ((char *)&size, sizeof (size));
size = be16toh (size);
while (r < size)
{
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char key[500], value[500];
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r += ReadString (key, s);
s.seekg (1, std::ios_base::cur); r++; // =
r += ReadString (value, s);
s.seekg (1, std::ios_base::cur); r++; // ;
if (!strcmp (key, "host"))
{
boost::system::error_code ecode;
address.host = boost::asio::ip::address::from_string (value, ecode);
if (ecode)
{
// TODO: we should try to resolve address here
LogPrint ("Unexpected address ", value);
SetUnreachable (true);
}
else
{
// add supported protocol
if (address.host.is_v4 ())
m_SupportedTransports |= (address.transportStyle == eTransportNTCP) ? eNTCPV4 : eSSUV4;
else
m_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, "key"))
Base64ToByteStream (value, strlen (value), address.key, 32);
else if (key[0] == 'i')
{
// introducers
size_t l = strlen(key);
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unsigned char index = key[l-1] - '0'; // TODO:
key[l-1] = 0;
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);
}
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}
m_Addresses.push_back(address);
}
// read peers
uint8_t numPeers;
s.read ((char *)&numPeers, sizeof (numPeers));
s.seekg (numPeers*32, std::ios_base::cur); // TODO: read peers
// read properties
uint16_t size, r = 0;
s.read ((char *)&size, sizeof (size));
size = be16toh (size);
while (r < size)
{
#ifdef _WIN32
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char key[500], value[500];
// TODO: investigate why properties get read as one long string under Windows
// length should not be more than 44
#else
char key[50], value[50];
#endif
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r += ReadString (key, s);
s.seekg (1, std::ios_base::cur); r++; // =
r += ReadString (value, s);
s.seekg (1, std::ios_base::cur); r++; // ;
m_Properties[key] = value;
}
CryptoPP::SHA256().CalculateDigest(m_IdentHash, (uint8_t *)&m_RouterIdentity, sizeof (m_RouterIdentity));
UpdateIdentHashBase64 ();
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UpdateRoutingKey ();
if (!m_SupportedTransports)
SetUnreachable (true);
}
void RouterInfo::UpdateIdentHashBase64 ()
{
size_t l = i2p::data::ByteStreamToBase64 (m_IdentHash, 32, m_IdentHashBase64, 48);
m_IdentHashBase64[l] = 0;
memcpy (m_IdentHashAbbreviation, m_IdentHashBase64, 4);
m_IdentHashAbbreviation[4] = 0;
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}
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void RouterInfo::UpdateRoutingKey ()
{
m_RoutingKey = CreateRoutingKey (m_IdentHash);
}
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void RouterInfo::WriteToStream (std::ostream& s)
{
s.write ((char *)&m_RouterIdentity, sizeof (m_RouterIdentity));
uint64_t ts = htobe64 (m_Timestamp);
s.write ((char *)&ts, sizeof (ts));
// addresses
uint8_t numAddresses = m_Addresses.size ();
s.write ((char *)&numAddresses, sizeof (numAddresses));
for (auto& address : m_Addresses)
{
s.write ((char *)&address.cost, sizeof (address.cost));
s.write ((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 << '=';
WriteString ("B", properties); // TODO: should be 'BC' for introducers
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)
{
// wtite intro key
WriteString ("key", properties);
properties << '=';
char value[64];
size_t l = ByteStreamToBase64 (address.key, 32, value, 64);
value[l] = 0;
WriteString (value, properties);
properties << ';';
}
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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 (auto& p : m_Properties)
{
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 ());
}
void RouterInfo::CreateBuffer ()
{
m_Timestamp = i2p::util::GetMillisecondsSinceEpoch (); // refresh timstamp
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std::stringstream s;
WriteToStream (s);
m_BufferLen = s.str ().size ();
memcpy (m_Buffer, s.str ().c_str (), m_BufferLen);
// signature
i2p::context.Sign ((uint8_t *)m_Buffer, m_BufferLen, (uint8_t *)m_Buffer + m_BufferLen);
m_BufferLen += 40;
}
size_t RouterInfo::ReadString (char * str, std::istream& s)
{
uint8_t len;
s.read ((char *)&len, 1);
s.read (str, len);
str[len] = 0;
return len+1;
}
void RouterInfo::WriteString (const std::string& str, std::ostream& s)
{
uint8_t len = str.size ();
s.write ((char *)&len, 1);
s.write (str.c_str (), len);
}
void RouterInfo::AddNTCPAddress (const char * host, int port)
{
Address addr;
addr.host = boost::asio::ip::address::from_string (host);
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addr.port = port;
addr.transportStyle = eTransportNTCP;
addr.cost = 2;
addr.date = 0;
m_Addresses.push_back(addr);
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m_SupportedTransports |= eNTCPV4;
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}
void RouterInfo::AddSSUAddress (const char * host, int port, const uint8_t * key)
{
Address addr;
addr.host = boost::asio::ip::address::from_string (host);
addr.port = port;
addr.transportStyle = eTransportSSU;
addr.cost = 10; // NTCP should have prioprity over SSU
addr.date = 0;
memcpy (addr.key, key, 32);
m_Addresses.push_back(addr);
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m_SupportedTransports |= eSSUV4;
}
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void RouterInfo::SetProperty (const char * key, const char * value)
{
m_Properties[key] = value;
}
const char * RouterInfo::GetProperty (const char * key) const
{
auto it = m_Properties.find (key);
if (it != m_Properties.end ())
return it->second.c_str ();
return 0;
}
bool RouterInfo::IsFloodfill () const
{
const char * caps = GetProperty ("caps");
if (caps)
return strchr (caps, 'f');
return false;
}
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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::UsesIntroducer () const
{
if (!IsSSU ()) return false;
auto address = GetSSUAddress (true); // no introducers for v6
return address && !address->introducers.empty ();
}
const RouterInfo::Address * RouterInfo::GetNTCPAddress (bool v4only) const
{
return GetAddress (eTransportNTCP, v4only);
}
const RouterInfo::Address * RouterInfo::GetSSUAddress (bool v4only) const
{
return GetAddress (eTransportSSU, v4only);
}
const RouterInfo::Address * RouterInfo::GetAddress (TransportStyle s, bool v4only) const
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{
for (auto& address : m_Addresses)
{
if (address.transportStyle == s)
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{
if (!v4only || address.host.is_v4 ())
return &address;
}
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}
return nullptr;
}
}
}