I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include <fstream>
#include <openssl/rand.h>
#include "Config.h"
#include "Crypto.h"
#include "Ed25519.h"
#include "Timestamp.h"
#include "I2NPProtocol.h"
#include "NetDb.hpp"
#include "FS.h"
#include "util.h"
#include "version.h"
#include "Log.h"
#include "Family.h"
#include "RouterContext.h"
namespace i2p
{
RouterContext context;
RouterContext::RouterContext ():
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m_LastUpdateTime (0), m_AcceptsTunnels (true), m_IsFloodfill (false),
m_StartupTime (0), m_ShareRatio (100), m_Status (eRouterStatusOK),
m_Error (eRouterErrorNone), m_NetID (I2PD_NET_ID)
{
}
void RouterContext::Init ()
{
srand (i2p::util::GetMillisecondsSinceEpoch () % 1000);
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m_StartupTime = i2p::util::GetSecondsSinceEpoch ();
if (!Load ())
CreateNewRouter ();
m_Decryptor = m_Keys.CreateDecryptor (nullptr);
UpdateRouterInfo ();
}
void RouterContext::CreateNewRouter ()
{
m_Keys = i2p::data::PrivateKeys::CreateRandomKeys (i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519);
SaveKeys ();
NewRouterInfo ();
}
void RouterContext::NewRouterInfo ()
{
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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
if (port == 9150) port = 9151; // Tor browser
}
bool ipv4; i2p::config::GetOption("ipv4", ipv4);
bool ipv6; i2p::config::GetOption("ipv6", ipv6);
bool ssu; i2p::config::GetOption("ssu", ssu);
bool ntcp; i2p::config::GetOption("ntcp", ntcp);
bool ntcp2; i2p::config::GetOption("ntcp2.enabled", ntcp2);
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();
if (ssu)
routerInfo.AddSSUAddress (host.c_str(), port, routerInfo.GetIdentHash ());
if (ntcp)
routerInfo.AddNTCPAddress (host.c_str(), port);
}
if (ipv6)
{
std::string host = "::1";
if (!i2p::config::IsDefault("host") && !ipv4) // override if v6 only
i2p::config::GetOption("host", host);
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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();
if (ssu)
routerInfo.AddSSUAddress (host.c_str(), port, routerInfo.GetIdentHash ());
if (ntcp)
routerInfo.AddNTCPAddress (host.c_str(), port);
}
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routerInfo.SetCaps (i2p::data::RouterInfo::eReachable |
i2p::data::RouterInfo::eSSUTesting | i2p::data::RouterInfo::eSSUIntroducer); // LR, BC
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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 ());
if (ntcp2) // we don't store iv in the address if non published so we must update it from keys
{
if (!m_NTCP2Keys) NewNTCP2Keys ();
UpdateNTCP2Address (true);
if (!ntcp) // NTCP2 should replace NTCP
{
bool published; i2p::config::GetOption("ntcp2.published", published);
if (published)
{
PublishNTCP2Address (port, true);
if (ipv6)
{
// add NTCP2 ipv6 address
std::string host = "::1";
if (!i2p::config::IsDefault ("ntcp2.addressv6"))
i2p::config::GetOption ("ntcp2.addressv6", host);
m_RouterInfo.AddNTCP2Address (m_NTCP2Keys->staticPublicKey, m_NTCP2Keys->iv, boost::asio::ip::address_v6::from_string (host), port);
}
}
}
}
}
void RouterContext::UpdateRouterInfo ()
{
m_RouterInfo.CreateBuffer (m_Keys);
m_RouterInfo.SaveToFile (i2p::fs::DataDirPath (ROUTER_INFO));
m_LastUpdateTime = i2p::util::GetSecondsSinceEpoch ();
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}
void RouterContext::NewNTCP2Keys ()
{
m_StaticKeys.reset (new i2p::crypto::X25519Keys ());
m_StaticKeys->GenerateKeys ();
m_NTCP2Keys.reset (new NTCP2PrivateKeys ());
m_StaticKeys->GetPrivateKey (m_NTCP2Keys->staticPrivateKey);
memcpy (m_NTCP2Keys->staticPublicKey, m_StaticKeys->GetPublicKey (), 32);
RAND_bytes (m_NTCP2Keys->iv, 16);
// save
std::ofstream fk (i2p::fs::DataDirPath (NTCP2_KEYS), std::ofstream::binary | std::ofstream::out);
fk.write ((char *)m_NTCP2Keys.get (), sizeof (NTCP2PrivateKeys));
}
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void RouterContext::SetStatus (RouterStatus status)
{
if (status != m_Status)
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{
m_Status = status;
m_Error = eRouterErrorNone;
switch (m_Status)
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{
case eRouterStatusOK:
SetReachable ();
break;
case eRouterStatusFirewalled:
SetUnreachable ();
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break;
default:
;
}
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}
}
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void RouterContext::UpdatePort (int port)
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{
bool updated = false;
for (auto& address : m_RouterInfo.GetAddresses ())
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{
if (!address->IsNTCP2 () && address->port != port)
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{
address->port = port;
updated = true;
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}
}
if (updated)
UpdateRouterInfo ();
}
void RouterContext::PublishNTCP2Address (int port, bool publish)
{
if (!m_NTCP2Keys) return;
if (!port)
{
port = rand () % (30777 - 9111) + 9111; // I2P network ports range
if (port == 9150) port = 9151; // Tor browser
}
bool updated = false;
for (auto& address : m_RouterInfo.GetAddresses ())
{
if (address->IsNTCP2 () && (address->port != port || address->ntcp2->isPublished != publish))
{
address->port = port;
address->cost = publish ? 3 : 14;
address->ntcp2->isPublished = publish;
address->ntcp2->iv = m_NTCP2Keys->iv;
updated = true;
}
}
if (updated)
UpdateRouterInfo ();
}
void RouterContext::UpdateNTCP2Address (bool enable)
{
auto& addresses = m_RouterInfo.GetAddresses ();
bool found = false, updated = false;
for (auto it = addresses.begin (); it != addresses.end (); ++it)
{
if ((*it)->IsNTCP2 ())
{
found = true;
if (!enable)
{
addresses.erase (it);
updated= true;
}
break;
}
}
if (enable && !found)
{
m_RouterInfo.AddNTCP2Address (m_NTCP2Keys->staticPublicKey, m_NTCP2Keys->iv);
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))
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{
address->host = host;
if (host.is_v6 () && address->transportStyle == i2p::data::RouterInfo::eTransportSSU)
{
// update MTU
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");
}
if (address->ssu) address->ssu->mtu = mtu;
}
}
updated = true;
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}
}
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)
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UpdateRouterInfo ();
return ret;
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}
void RouterContext::RemoveIntroducer (const boost::asio::ip::udp::endpoint& e)
{
if (m_RouterInfo.RemoveIntroducer (e))
UpdateRouterInfo ();
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}
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);
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}
else
{
m_RouterInfo.DeleteProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY);
m_RouterInfo.DeleteProperty (i2p::data::ROUTER_INFO_PROPERTY_FAMILY_SIG);
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}
}
void RouterContext::SetBandwidth (char L)
{
uint32_t limit = 0;
enum { low, high, extra, unlim } type = high;
/* detect parameters */
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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 = 1000000; type = unlim; break; // 1Gbyte/s
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;
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switch (type)
{
case low : /* not set */; break;
case extra : caps |= i2p::data::RouterInfo::eExtraBandwidth; break; // 'P'
case unlim : caps |= i2p::data::RouterInfo::eExtraBandwidth; // no break here, extra + high means 'X'
case high : caps |= i2p::data::RouterInfo::eHighBandwidth; break;
}
m_RouterInfo.SetCaps (caps);
UpdateRouterInfo ();
m_BandwidthLimit = limit;
}
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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'); }
}
void RouterContext::SetShareRatio (int percents)
{
if (percents < 0) percents = 0;
if (percents > 100) percents = 100;
m_ShareRatio = percents;
}
bool RouterContext::IsUnreachable () const
{
return m_RouterInfo.GetCaps () & i2p::data::RouterInfo::eUnreachable;
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}
void RouterContext::PublishNTCPAddress (bool publish, bool v4only)
{
auto& addresses = m_RouterInfo.GetAddresses ();
if (publish)
{
for (const auto& addr : addresses) // v4
{
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;
}
}
if (!v4only)
{
for (const auto& addr : addresses) // v6
{
if (addr->transportStyle == i2p::data::RouterInfo::eTransportSSU &&
addr->host.is_v6 ())
{
// insert NTCP address with host/port from SSU
m_RouterInfo.AddNTCPAddress (addr->host.to_string ().c_str (), addr->port);
break;
}
}
}
}
else
{
for (auto it = addresses.begin (); it != addresses.end ();)
{
if ((*it)->transportStyle == i2p::data::RouterInfo::eTransportNTCP && !(*it)->IsNTCP2 () &&
(!v4only || (*it)->host.is_v4 ()))
{
it = addresses.erase (it);
if (v4only) break; // otherwise might be more than one address
}
else
++it;
}
}
}
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void RouterContext::SetUnreachable ()
{
// set caps
uint8_t caps = m_RouterInfo.GetCaps ();
caps &= ~i2p::data::RouterInfo::eReachable;
caps |= i2p::data::RouterInfo::eUnreachable;
caps &= ~i2p::data::RouterInfo::eFloodfill; // can't be floodfill
caps &= ~i2p::data::RouterInfo::eSSUIntroducer; // can't be introducer
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m_RouterInfo.SetCaps (caps);
// remove NTCP v4 address
PublishNTCPAddress (false);
// delete previous introducers
auto& addresses = m_RouterInfo.GetAddresses ();
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for (auto& addr : addresses)
if (addr->ssu)
addr->ssu->introducers.clear ();
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// 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
bool ntcp; i2p::config::GetOption("ntcp", ntcp);
if (ntcp)
PublishNTCPAddress (true);
// delete previous introducers
auto& addresses = m_RouterInfo.GetAddresses ();
for (auto& addr : addresses)
if (addr->ssu)
addr->ssu->introducers.clear ();
// update
UpdateRouterInfo ();
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}
void RouterContext::SetSupportsV6 (bool supportsV6)
{
if (supportsV6)
{
m_RouterInfo.EnableV6 ();
// insert v6 addresses if necessary
bool foundSSU = false, foundNTCP = false, foundNTCP2 = false;
uint16_t port = 0;
auto& addresses = m_RouterInfo.GetAddresses ();
for (auto& addr: addresses)
{
if (addr->host.is_v6 ())
{
if (addr->transportStyle == i2p::data::RouterInfo::eTransportSSU)
foundSSU = true;
else if (addr->IsNTCP2 ())
{
if (addr->IsPublishedNTCP2 ()) foundNTCP2 = true;
}
else
foundNTCP = true;
}
port = addr->port;
}
if (!port) i2p::config::GetOption("port", port);
// SSU
if (!foundSSU)
{
bool ssu; i2p::config::GetOption("ssu", ssu);
if (ssu)
{
std::string host = "::1"; // TODO: read host
m_RouterInfo.AddSSUAddress (host.c_str (), port, GetIdentHash ());
}
}
// NTCP2
if (!foundNTCP2)
{
bool ntcp2; i2p::config::GetOption("ntcp2.enabled", ntcp2);
bool ntcp2Published; i2p::config::GetOption("ntcp2.published", ntcp2Published);
if (ntcp2 && ntcp2Published)
{
std::string ntcp2Host;
if (!i2p::config::IsDefault ("ntcp2.addressv6"))
i2p::config::GetOption ("ntcp2.addressv6", ntcp2Host);
else
ntcp2Host = "::1";
uint16_t ntcp2Port; i2p::config::GetOption ("ntcp2.port", ntcp2Port);
if (!ntcp2Port) ntcp2Port = port;
m_RouterInfo.AddNTCP2Address (m_NTCP2Keys->staticPublicKey, m_NTCP2Keys->iv, boost::asio::ip::address::from_string (ntcp2Host), ntcp2Port);
}
}
// NTCP
if (!foundNTCP)
{
bool ntcp; i2p::config::GetOption("ntcp", ntcp);
if (ntcp)
{
std::string host = "::1";
m_RouterInfo.AddNTCPAddress (host.c_str (), port);
}
}
}
else
m_RouterInfo.DisableV6 ();
UpdateRouterInfo ();
}
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void RouterContext::SetSupportsV4 (bool supportsV4)
{
if (supportsV4)
m_RouterInfo.EnableV4 ();
else
m_RouterInfo.DisableV4 ();
UpdateRouterInfo ();
}
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void RouterContext::UpdateNTCP2V6Address (const boost::asio::ip::address& host)
{
bool updated = false;
auto& addresses = m_RouterInfo.GetAddresses ();
for (auto& addr: addresses)
{
if (addr->IsPublishedNTCP2 ())
{
if (addr->host.is_v6 ())
{
if (addr->host != host)
{
addr->host = host;
updated = true;
}
break;
}
}
}
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 ()));
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UpdateRouterInfo ();
}
}
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void RouterContext::UpdateTimestamp (uint64_t ts)
{
if (ts > m_LastUpdateTime + ROUTER_INFO_UPDATE_INTERVAL)
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();
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fk.seekg (0, std::ios::beg);
if (len == sizeof (i2p::data::Keys)) // old keys file format
{
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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;
}
// read NTCP2 keys if available
std::ifstream n2k (i2p::fs::DataDirPath (NTCP2_KEYS), std::ifstream::in | std::ifstream::binary);
if (n2k)
{
n2k.seekg (0, std::ios::end);
len = n2k.tellg();
n2k.seekg (0, std::ios::beg);
if (len == sizeof (NTCP2PrivateKeys))
{
m_NTCP2Keys.reset (new NTCP2PrivateKeys ());
n2k.read ((char *)m_NTCP2Keys.get (), sizeof (NTCP2PrivateKeys));
}
n2k.close ();
}
// read RouterInfo
m_RouterInfo.SetRouterIdentity (GetIdentity ());
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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 ();
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}
if (IsUnreachable ())
SetReachable (); // we assume reachable until we discover firewall through peer tests
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// read NTCP2
bool ntcp2; i2p::config::GetOption("ntcp2.enabled", ntcp2);
if (ntcp2)
{
if (!m_NTCP2Keys) NewNTCP2Keys ();
UpdateNTCP2Address (true); // enable NTCP2
}
else
UpdateNTCP2Address (false); // disable NTCP2
return true;
}
void RouterContext::SaveKeys ()
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{
// 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
{
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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, len), from));
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}
void RouterContext::ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg)
{
std::unique_lock<std::mutex> l(m_GarlicMutex);
i2p::garlic::GarlicDestination::ProcessGarlicMessage (msg);
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}
void RouterContext::ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg)
{
std::unique_lock<std::mutex> l(m_GarlicMutex);
i2p::garlic::GarlicDestination::ProcessDeliveryStatusMessage (msg);
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}
void RouterContext::CleanupDestination ()
{
std::unique_lock<std::mutex> l(m_GarlicMutex);
i2p::garlic::GarlicDestination::CleanupExpiredTags ();
}
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uint32_t RouterContext::GetUptime () const
{
return i2p::util::GetSecondsSinceEpoch () - m_StartupTime;
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}
bool RouterContext::Decrypt (const uint8_t * encrypted, uint8_t * data, BN_CTX * ctx) const
{
return m_Decryptor ? m_Decryptor->Decrypt (encrypted, data, ctx, true) : false;
}
bool RouterContext::DecryptTunnelBuildRecord (const uint8_t * encrypted, uint8_t * data, BN_CTX * ctx) const
{
return m_Decryptor ? m_Decryptor->Decrypt (encrypted, data, ctx, false) : false;
}
i2p::crypto::X25519Keys& RouterContext::GetStaticKeys ()
{
if (!m_StaticKeys)
{
if (!m_NTCP2Keys) NewNTCP2Keys ();
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auto x = new i2p::crypto::X25519Keys (m_NTCP2Keys->staticPrivateKey, m_NTCP2Keys->staticPublicKey);
if (!m_StaticKeys)
m_StaticKeys.reset (x);
else
delete x;
}
return *m_StaticKeys;
}
}