I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include <fstream>
#include "Config.h"
#include "Crypto.h"
#include "Timestamp.h"
#include "I2NPProtocol.h"
#include "NetDb.h"
#include "FS.h"
#include "util.h"
#include "version.h"
#include "Log.h"
#include "Family.h"
#include "RouterContext.h"
namespace i2p
{
RouterContext context;
RouterContext::RouterContext ():
m_LastUpdateTime (0), m_AcceptsTunnels (true), m_IsFloodfill (false),
m_StartupTime (0), m_Status (eRouterStatusOK), m_Error (eRouterErrorNone),
m_NetID (I2PD_NET_ID)
{
}
void RouterContext::Init ()
{
srand (i2p::util::GetMillisecondsSinceEpoch () % 1000);
m_StartupTime = i2p::util::GetSecondsSinceEpoch ();
if (!Load ())
CreateNewRouter ();
UpdateRouterInfo ();
}
void RouterContext::CreateNewRouter ()
{
#if defined(__x86_64__) || defined(__i386__) || defined(_MSC_VER)
m_Keys = i2p::data::PrivateKeys::CreateRandomKeys (i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519);
#else
m_Keys = i2p::data::PrivateKeys::CreateRandomKeys (i2p::data::SIGNING_KEY_TYPE_DSA_SHA1);
#endif
SaveKeys ();
NewRouterInfo ();
}
void RouterContext::NewRouterInfo ()
{
i2p::data::RouterInfo routerInfo;
routerInfo.SetRouterIdentity (GetIdentity ());
uint16_t port; i2p::config::GetOption("port", port);
if (!port)
port = rand () % (30777 - 9111) + 9111; // I2P network ports range
bool ipv4; i2p::config::GetOption("ipv4", ipv4);
bool ipv6; i2p::config::GetOption("ipv6", ipv6);
bool nat; i2p::config::GetOption("nat", nat);
std::string ifname; i2p::config::GetOption("ifname", ifname);
std::string ifname4; i2p::config::GetOption("ifname4", ifname4);
std::string ifname6; i2p::config::GetOption("ifname6", ifname6);
if (ipv4)
{
std::string host = "127.0.0.1";
if (!i2p::config::IsDefault("host"))
i2p::config::GetOption("host", host);
else if (!nat && !ifname.empty())
/* bind to interface, we have no NAT so set external address too */
host = i2p::util::net::GetInterfaceAddress(ifname, false).to_string(); // v4
if(ifname4.size())
host = i2p::util::net::GetInterfaceAddress(ifname4, false).to_string();
routerInfo.AddSSUAddress (host.c_str(), port, routerInfo.GetIdentHash ());
routerInfo.AddNTCPAddress (host.c_str(), port);
}
if (ipv6)
{
std::string host = "::";
if (!i2p::config::IsDefault("host") && !ipv4) // override if v6 only
i2p::config::GetOption("host", host);
else if (!ifname.empty())
host = i2p::util::net::GetInterfaceAddress(ifname, true).to_string(); // v6
if(ifname6.size())
host = i2p::util::net::GetInterfaceAddress(ifname6, true).to_string();
routerInfo.AddSSUAddress (host.c_str(), port, routerInfo.GetIdentHash ());
routerInfo.AddNTCPAddress (host.c_str(), port);
}
routerInfo.SetCaps (i2p::data::RouterInfo::eReachable |
i2p::data::RouterInfo::eSSUTesting | i2p::data::RouterInfo::eSSUIntroducer); // LR, BC
routerInfo.SetProperty ("netId", std::to_string (m_NetID));
routerInfo.SetProperty ("router.version", I2P_VERSION);
routerInfo.CreateBuffer (m_Keys);
m_RouterInfo.SetRouterIdentity (GetIdentity ());
m_RouterInfo.Update (routerInfo.GetBuffer (), routerInfo.GetBufferLen ());
}
void RouterContext::UpdateRouterInfo ()
{
m_RouterInfo.CreateBuffer (m_Keys);
m_RouterInfo.SaveToFile (i2p::fs::DataDirPath (ROUTER_INFO));
m_LastUpdateTime = i2p::util::GetSecondsSinceEpoch ();
}
void RouterContext::SetStatus (RouterStatus status)
{
if (status != m_Status)
{
m_Status = status;
m_Error = eRouterErrorNone;
switch (m_Status)
{
case eRouterStatusOK:
SetReachable ();
break;
case eRouterStatusFirewalled:
SetUnreachable ();
break;
default:
;
}
}
}
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::Introducer& introducer)
{
bool ret = m_RouterInfo.AddIntroducer (introducer);
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 (i2p::data::ROUTER_INFO_PROPERTY_LEASESETS);
m_RouterInfo.DeleteProperty (i2p::data::ROUTER_INFO_PROPERTY_ROUTERS);
}
UpdateRouterInfo ();
}
std::string RouterContext::GetFamily () const
{
return m_RouterInfo.GetProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY);
}
void RouterContext::SetFamily (const std::string& family)
{
std::string signature;
if (family.length () > 0)
signature = i2p::data::CreateFamilySignature (family, GetIdentHash ());
if (signature.length () > 0)
{
m_RouterInfo.SetProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY, family);
m_RouterInfo.SetProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY_SIG, signature);
}
else
{
m_RouterInfo.DeleteProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY);
m_RouterInfo.DeleteProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY_SIG);
}
}
void RouterContext::SetBandwidth (char L) {
uint16_t limit = 0;
enum { low, high, extra } type = high;
/* detect parameters */
switch (L)
{
case i2p::data::CAPS_FLAG_LOW_BANDWIDTH1 : limit = 12; type = low; break;
case i2p::data::CAPS_FLAG_LOW_BANDWIDTH2 : limit = 48; type = low; break;
case i2p::data::CAPS_FLAG_HIGH_BANDWIDTH1 : limit = 64; type = high; break;
case i2p::data::CAPS_FLAG_HIGH_BANDWIDTH2 : limit = 128; type = high; break;
case i2p::data::CAPS_FLAG_HIGH_BANDWIDTH3 : limit = 256; type = high; break;
case i2p::data::CAPS_FLAG_EXTRA_BANDWIDTH1 : limit = 2048; type = extra; break;
case i2p::data::CAPS_FLAG_EXTRA_BANDWIDTH2 : limit = 9999; type = extra; break;
default:
limit = 48; type = low;
}
/* update caps & flags in RI */
auto caps = m_RouterInfo.GetCaps ();
caps &= ~i2p::data::RouterInfo::eHighBandwidth;
caps &= ~i2p::data::RouterInfo::eExtraBandwidth;
switch (type)
{
case low : /* not set */; break;
case extra : caps |= i2p::data::RouterInfo::eExtraBandwidth; // no break here
case high : caps |= i2p::data::RouterInfo::eHighBandwidth; break;
}
m_RouterInfo.SetCaps (caps);
UpdateRouterInfo ();
m_BandwidthLimit = limit;
}
void RouterContext::SetBandwidth (int limit)
{
if (limit > 2000) { SetBandwidth('X'); }
else if (limit > 256) { SetBandwidth('P'); }
else if (limit > 128) { SetBandwidth('O'); }
else if (limit > 64) { SetBandwidth('N'); }
else if (limit > 48) { SetBandwidth('M'); }
else if (limit > 12) { SetBandwidth('L'); }
else { SetBandwidth('K'); }
}
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 (auto it = addresses.begin (); it != addresses.end (); ++it)
{
if ((*it)->transportStyle == i2p::data::RouterInfo::eTransportNTCP &&
(*it)->host.is_v4 ())
{
addresses.erase (it);
break;
}
}
// delete previous introducers
for (auto& addr : addresses)
if (addr->ssu)
addr->ssu->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 (const auto& addr : addresses)
{
if (addr->transportStyle == i2p::data::RouterInfo::eTransportSSU &&
addr->host.is_v4 ())
{
// insert NTCP address with host/port from SSU
m_RouterInfo.AddNTCPAddress (addr->host.to_string ().c_str (), addr->port);
break;
}
}
// delete previous introducers
for (auto& addr : addresses)
if (addr->ssu)
addr->ssu->introducers.clear ();
// update
UpdateRouterInfo ();
}
void RouterContext::SetSupportsV6 (bool supportsV6)
{
if (supportsV6)
m_RouterInfo.EnableV6 ();
else
m_RouterInfo.DisableV6 ();
UpdateRouterInfo ();
}
void RouterContext::SetSupportsV4 (bool supportsV4)
{
if (supportsV4)
m_RouterInfo.EnableV4 ();
else
m_RouterInfo.DisableV4 ();
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 (eLogDebug, "Router: Our v6 MTU=", mtu);
if (mtu > 1472) { // TODO: magic constant
mtu = 1472;
LogPrint(eLogWarning, "Router: MTU dropped to upper limit of 1472 bytes");
}
}
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 (i2p::data::ROUTER_INFO_PROPERTY_LEASESETS, std::to_string(i2p::data::netdb.GetNumLeaseSets ()));
m_RouterInfo.SetProperty (i2p::data::ROUTER_INFO_PROPERTY_ROUTERS, std::to_string(i2p::data::netdb.GetNumRouters ()));
UpdateRouterInfo ();
}
}
bool RouterContext::Load ()
{
std::ifstream fk (i2p::fs::DataDirPath (ROUTER_KEYS), std::ifstream::in | std::ifstream::binary);
if (!fk.is_open ()) return false;
fk.seekg (0, std::ios::end);
size_t len = fk.tellg();
fk.seekg (0, std::ios::beg);
if (len == sizeof (i2p::data::Keys)) // old keys file format
{
i2p::data::Keys keys;
fk.read ((char *)&keys, sizeof (keys));
m_Keys = keys;
}
else // new keys file format
{
uint8_t * buf = new uint8_t[len];
fk.read ((char *)buf, len);
m_Keys.FromBuffer (buf, len);
delete[] buf;
}
m_RouterInfo.SetRouterIdentity (GetIdentity ());
i2p::data::RouterInfo routerInfo(i2p::fs::DataDirPath (ROUTER_INFO));
if (!routerInfo.IsUnreachable ()) // router.info looks good
{
m_RouterInfo.Update (routerInfo.GetBuffer (), routerInfo.GetBufferLen ());
m_RouterInfo.SetProperty ("coreVersion", I2P_VERSION);
m_RouterInfo.SetProperty ("router.version", I2P_VERSION);
// Migration to 0.9.24. TODO: remove later
m_RouterInfo.DeleteProperty ("coreVersion");
m_RouterInfo.DeleteProperty ("stat_uptime");
}
else
{
LogPrint (eLogError, ROUTER_INFO, " is malformed. Creating new");
NewRouterInfo ();
}
if (IsUnreachable ())
SetReachable (); // we assume reachable until we discover firewall through peer tests
return true;
}
void RouterContext::SaveKeys ()
{
// save in the same format as .dat files
std::ofstream fk (i2p::fs::DataDirPath (ROUTER_KEYS), std::ofstream::binary | std::ofstream::out);
size_t len = m_Keys.GetFullLen ();
uint8_t * buf = new uint8_t[len];
m_Keys.ToBuffer (buf, len);
fk.write ((char *)buf, len);
delete[] buf;
}
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));
}
void RouterContext::ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg)
{
std::unique_lock<std::mutex> l(m_GarlicMutex);
i2p::garlic::GarlicDestination::ProcessGarlicMessage (msg);
}
void RouterContext::ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg)
{
std::unique_lock<std::mutex> l(m_GarlicMutex);
i2p::garlic::GarlicDestination::ProcessDeliveryStatusMessage (msg);
}
void RouterContext::CleanupDestination ()
{
std::unique_lock<std::mutex> l(m_GarlicMutex);
i2p::garlic::GarlicDestination::CleanupExpiredTags ();
}
uint32_t RouterContext::GetUptime () const
{
return i2p::util::GetSecondsSinceEpoch () - m_StartupTime;
}
}