I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include <fstream>
#include <cryptopp/dh.h>
#include <cryptopp/dsa.h>
#include <boost/lexical_cast.hpp>
#include "CryptoConst.h"
#include "RouterContext.h"
#include "Timestamp.h"
#include "I2NPProtocol.h"
#include "NetDb.h"
#include "util.h"
#include "version.h"
namespace i2p
{
RouterContext context;
RouterContext::RouterContext ():
m_LastUpdateTime (0), m_AcceptsTunnels (true), m_IsFloodfill (false),
m_StartupTime (0), m_Status (eRouterStatusOK )
{
}
void RouterContext::Init ()
{
m_StartupTime = i2p::util::GetSecondsSinceEpoch ();
if (!Load ())
CreateNewRouter ();
UpdateRouterInfo ();
}
void RouterContext::CreateNewRouter ()
{
m_Keys = i2p::data::CreateRandomKeys ();
SaveKeys ();
NewRouterInfo ();
}
void RouterContext::NewRouterInfo ()
{
i2p::data::RouterInfo routerInfo;
routerInfo.SetRouterIdentity (GetIdentity ());
int port = i2p::util::config::GetArg("-port", 0);
if (!port)
port = m_Rnd.GenerateWord32 (9111, 30777); // I2P network ports range
routerInfo.AddSSUAddress (i2p::util::config::GetCharArg("-host", "127.0.0.1"), port, routerInfo.GetIdentHash ());
routerInfo.AddNTCPAddress (i2p::util::config::GetCharArg("-host", "127.0.0.1"), port);
routerInfo.SetCaps (i2p::data::RouterInfo::eReachable |
i2p::data::RouterInfo::eSSUTesting | i2p::data::RouterInfo::eSSUIntroducer); // LR, BC
routerInfo.SetProperty ("coreVersion", I2P_VERSION);
routerInfo.SetProperty ("netId", "2");
routerInfo.SetProperty ("router.version", I2P_VERSION);
routerInfo.SetProperty ("stat_uptime", "90m");
routerInfo.CreateBuffer (m_Keys);
m_RouterInfo.Update (routerInfo.GetBuffer (), routerInfo.GetBufferLen ());
}
void RouterContext::UpdateRouterInfo ()
{
m_RouterInfo.CreateBuffer (m_Keys);
m_RouterInfo.SaveToFile (i2p::util::filesystem::GetFullPath (ROUTER_INFO));
m_LastUpdateTime = i2p::util::GetSecondsSinceEpoch ();
}
void RouterContext::UpdatePort (int port)
{
bool updated = false;
for (auto& address : m_RouterInfo.GetAddresses ())
{
if (address.port != port)
{
address.port = port;
updated = true;
}
}
if (updated)
UpdateRouterInfo ();
}
void RouterContext::UpdateAddress (const boost::asio::ip::address& host)
{
bool updated = false;
for (auto& address : m_RouterInfo.GetAddresses ())
{
if (address.host != host && address.IsCompatible (host))
{
address.host = host;
updated = true;
}
}
auto ts = i2p::util::GetSecondsSinceEpoch ();
if (updated || ts > m_LastUpdateTime + ROUTER_INFO_UPDATE_INTERVAL)
UpdateRouterInfo ();
}
bool RouterContext::AddIntroducer (const i2p::data::RouterInfo& routerInfo, uint32_t tag)
{
bool ret = false;
auto address = routerInfo.GetSSUAddress ();
if (address)
{
ret = m_RouterInfo.AddIntroducer (address, tag);
if (ret)
UpdateRouterInfo ();
}
return ret;
}
void RouterContext::RemoveIntroducer (const boost::asio::ip::udp::endpoint& e)
{
if (m_RouterInfo.RemoveIntroducer (e))
UpdateRouterInfo ();
}
void RouterContext::SetFloodfill (bool floodfill)
{
m_IsFloodfill = floodfill;
if (floodfill)
m_RouterInfo.SetCaps (m_RouterInfo.GetCaps () | i2p::data::RouterInfo::eFloodfill);
else
{
m_RouterInfo.SetCaps (m_RouterInfo.GetCaps () & ~i2p::data::RouterInfo::eFloodfill);
// we don't publish number of routers and leaseset for non-floodfill
m_RouterInfo.DeleteProperty (ROUTER_INFO_PROPERTY_LEASESETS);
m_RouterInfo.DeleteProperty (ROUTER_INFO_PROPERTY_ROUTERS);
}
UpdateRouterInfo ();
}
void RouterContext::SetHighBandwidth ()
{
if (!m_RouterInfo.IsHighBandwidth ())
{
m_RouterInfo.SetCaps (m_RouterInfo.GetCaps () | i2p::data::RouterInfo::eHighBandwidth);
UpdateRouterInfo ();
}
}
void RouterContext::SetLowBandwidth ()
{
if (m_RouterInfo.IsHighBandwidth ())
{
m_RouterInfo.SetCaps (m_RouterInfo.GetCaps () & ~i2p::data::RouterInfo::eHighBandwidth);
UpdateRouterInfo ();
}
}
bool RouterContext::IsUnreachable () const
{
return m_RouterInfo.GetCaps () & i2p::data::RouterInfo::eUnreachable;
}
void RouterContext::SetUnreachable ()
{
// set caps
m_RouterInfo.SetCaps (i2p::data::RouterInfo::eUnreachable | i2p::data::RouterInfo::eSSUTesting); // LU, B
// remove NTCP address
auto& addresses = m_RouterInfo.GetAddresses ();
for (size_t i = 0; i < addresses.size (); i++)
{
if (addresses[i].transportStyle == i2p::data::RouterInfo::eTransportNTCP)
{
addresses.erase (addresses.begin () + i);
break;
}
}
// delete previous introducers
for (auto& addr : addresses)
addr.introducers.clear ();
// update
UpdateRouterInfo ();
}
void RouterContext::SetReachable ()
{
// update caps
uint8_t caps = m_RouterInfo.GetCaps ();
caps &= ~i2p::data::RouterInfo::eUnreachable;
caps |= i2p::data::RouterInfo::eReachable;
caps |= i2p::data::RouterInfo::eSSUIntroducer;
if (m_IsFloodfill)
caps |= i2p::data::RouterInfo::eFloodfill;
m_RouterInfo.SetCaps (caps);
// insert NTCP back
auto& addresses = m_RouterInfo.GetAddresses ();
for (size_t i = 0; i < addresses.size (); i++)
{
if (addresses[i].transportStyle == i2p::data::RouterInfo::eTransportSSU)
{
// insert NTCP address with host/port form SSU
m_RouterInfo.AddNTCPAddress (addresses[i].host.to_string ().c_str (), addresses[i].port);
break;
}
}
// delete previous introducers
for (auto& addr : addresses)
addr.introducers.clear ();
// update
UpdateRouterInfo ();
}
void RouterContext::SetSupportsV6 (bool supportsV6)
{
if (supportsV6)
m_RouterInfo.EnableV6 ();
else
m_RouterInfo.DisableV6 ();
UpdateRouterInfo ();
}
void RouterContext::UpdateNTCPV6Address (const boost::asio::ip::address& host)
{
bool updated = false, found = false;
int port = 0;
auto& addresses = m_RouterInfo.GetAddresses ();
for (auto& addr : addresses)
{
if (addr.host.is_v6 () && addr.transportStyle == i2p::data::RouterInfo::eTransportNTCP)
{
if (addr.host != host)
{
addr.host = host;
updated = true;
}
found = true;
}
else
port = addr.port;
}
if (!found)
{
// create new address
m_RouterInfo.AddNTCPAddress (host.to_string ().c_str (), port);
auto mtu = i2p::util::net::GetMTU (host);
if (mtu)
{
LogPrint ("Our v6 MTU=", mtu);
if (mtu > 1472) mtu = 1472;
}
m_RouterInfo.AddSSUAddress (host.to_string ().c_str (), port, GetIdentHash (), mtu ? mtu : 1472); // TODO
updated = true;
}
if (updated)
UpdateRouterInfo ();
}
void RouterContext::UpdateStats ()
{
if (m_IsFloodfill)
{
// update routers and leasesets
m_RouterInfo.SetProperty (ROUTER_INFO_PROPERTY_LEASESETS, boost::lexical_cast<std::string>(i2p::data::netdb.GetNumLeaseSets ()));
m_RouterInfo.SetProperty (ROUTER_INFO_PROPERTY_ROUTERS, boost::lexical_cast<std::string>(i2p::data::netdb.GetNumRouters ()));
UpdateRouterInfo ();
}
}
bool RouterContext::Load ()
{
std::ifstream fk (i2p::util::filesystem::GetFullPath (ROUTER_KEYS).c_str (), std::ifstream::binary | std::ofstream::in);
if (!fk.is_open ()) return false;
i2p::data::Keys keys;
fk.read ((char *)&keys, sizeof (keys));
m_Keys = keys;
i2p::data::RouterInfo routerInfo(i2p::util::filesystem::GetFullPath (ROUTER_INFO)); // TODO
m_RouterInfo.Update (routerInfo.GetBuffer (), routerInfo.GetBufferLen ());
m_RouterInfo.SetProperty ("coreVersion", I2P_VERSION);
m_RouterInfo.SetProperty ("router.version", I2P_VERSION);
if (IsUnreachable ())
SetReachable (); // we assume reachable until we discover firewall through peer tests
return true;
}
void RouterContext::SaveKeys ()
{
std::ofstream fk (i2p::util::filesystem::GetFullPath (ROUTER_KEYS).c_str (), std::ofstream::binary | std::ofstream::out);
i2p::data::Keys keys;
memcpy (keys.privateKey, m_Keys.GetPrivateKey (), sizeof (keys.privateKey));
memcpy (keys.signingPrivateKey, m_Keys.GetSigningPrivateKey (), sizeof (keys.signingPrivateKey));
auto& ident = GetIdentity ().GetStandardIdentity ();
memcpy (keys.publicKey, ident.publicKey, sizeof (keys.publicKey));
memcpy (keys.signingKey, ident.signingKey, sizeof (keys.signingKey));
fk.write ((char *)&keys, sizeof (keys));
}
std::shared_ptr<i2p::tunnel::TunnelPool> RouterContext::GetTunnelPool () const
{
return i2p::tunnel::tunnels.GetExploratoryPool ();
}
void RouterContext::HandleI2NPMessage (const uint8_t * buf, size_t len, std::shared_ptr<i2p::tunnel::InboundTunnel> from)
{
i2p::HandleI2NPMessage (CreateI2NPMessage (buf, GetI2NPMessageLength (buf), from));
}
uint32_t RouterContext::GetUptime () const
{
return i2p::util::GetSecondsSinceEpoch () - m_StartupTime;
}
}