I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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/*
* Copyright (c) 2013-2023, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*/
#include <sys/stat.h>
#include <unordered_map>
#include <list>
#include <thread>
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#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/ini_parser.hpp>
#include "Base.h"
#include "FS.h"
#include "Log.h"
#include "Timestamp.h"
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#include "Profiling.h"
namespace i2p
{
namespace data
{
static i2p::fs::HashedStorage g_ProfilesStorage("peerProfiles", "p", "profile-", "txt");
static std::unordered_map<i2p::data::IdentHash, std::shared_ptr<RouterProfile> > g_Profiles;
static std::mutex g_ProfilesMutex;
static boost::posix_time::ptime GetTime ()
{
return boost::posix_time::second_clock::local_time();
}
RouterProfile::RouterProfile ():
m_LastUpdateTime (GetTime ()), m_IsUpdated (false),
m_LastDeclineTime (0), m_LastUnreachableTime (0),
m_NumTunnelsAgreed (0), m_NumTunnelsDeclined (0), m_NumTunnelsNonReplied (0),
m_NumTimesTaken (0), m_NumTimesRejected (0)
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{
}
void RouterProfile::UpdateTime ()
{
m_LastUpdateTime = GetTime ();
m_IsUpdated = true;
}
void RouterProfile::Save (const IdentHash& identHash)
{
// fill sections
boost::property_tree::ptree participation;
participation.put (PEER_PROFILE_PARTICIPATION_AGREED, m_NumTunnelsAgreed);
participation.put (PEER_PROFILE_PARTICIPATION_DECLINED, m_NumTunnelsDeclined);
participation.put (PEER_PROFILE_PARTICIPATION_NON_REPLIED, m_NumTunnelsNonReplied);
boost::property_tree::ptree usage;
usage.put (PEER_PROFILE_USAGE_TAKEN, m_NumTimesTaken);
usage.put (PEER_PROFILE_USAGE_REJECTED, m_NumTimesRejected);
// fill property tree
boost::property_tree::ptree pt;
pt.put (PEER_PROFILE_LAST_UPDATE_TIME, boost::posix_time::to_simple_string (m_LastUpdateTime));
if (m_LastUnreachableTime)
pt.put (PEER_PROFILE_LAST_UNREACHABLE_TIME, m_LastUnreachableTime);
pt.put_child (PEER_PROFILE_SECTION_PARTICIPATION, participation);
pt.put_child (PEER_PROFILE_SECTION_USAGE, usage);
// save to file
std::string ident = identHash.ToBase64 ();
std::string path = g_ProfilesStorage.Path(ident);
try {
boost::property_tree::write_ini (path, pt);
} catch (std::exception& ex) {
/* boost exception verbose enough */
LogPrint (eLogError, "Profiling: ", ex.what ());
}
}
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void RouterProfile::Load (const IdentHash& identHash)
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{
std::string ident = identHash.ToBase64 ();
std::string path = g_ProfilesStorage.Path(ident);
boost::property_tree::ptree pt;
if (!i2p::fs::Exists(path))
{
LogPrint(eLogWarning, "Profiling: No profile yet for ", ident);
return;
}
try
{
boost::property_tree::read_ini (path, pt);
} catch (std::exception& ex)
{
/* boost exception verbose enough */
LogPrint (eLogError, "Profiling: ", ex.what ());
return;
}
try
{
auto t = pt.get (PEER_PROFILE_LAST_UPDATE_TIME, "");
if (t.length () > 0)
m_LastUpdateTime = boost::posix_time::time_from_string (t);
if ((GetTime () - m_LastUpdateTime).hours () < PEER_PROFILE_EXPIRATION_TIMEOUT)
{
m_LastUnreachableTime = pt.get (PEER_PROFILE_LAST_UNREACHABLE_TIME, 0);
try
{
// read participations
auto participations = pt.get_child (PEER_PROFILE_SECTION_PARTICIPATION);
m_NumTunnelsAgreed = participations.get (PEER_PROFILE_PARTICIPATION_AGREED, 0);
m_NumTunnelsDeclined = participations.get (PEER_PROFILE_PARTICIPATION_DECLINED, 0);
m_NumTunnelsNonReplied = participations.get (PEER_PROFILE_PARTICIPATION_NON_REPLIED, 0);
}
catch (boost::property_tree::ptree_bad_path& ex)
{
LogPrint (eLogWarning, "Profiling: Missing section ", PEER_PROFILE_SECTION_PARTICIPATION, " in profile for ", ident);
}
try
{
// read usage
auto usage = pt.get_child (PEER_PROFILE_SECTION_USAGE);
m_NumTimesTaken = usage.get (PEER_PROFILE_USAGE_TAKEN, 0);
m_NumTimesRejected = usage.get (PEER_PROFILE_USAGE_REJECTED, 0);
}
catch (boost::property_tree::ptree_bad_path& ex)
{
LogPrint (eLogWarning, "Profiling: Missing section ", PEER_PROFILE_SECTION_USAGE, " in profile for ", ident);
}
}
else
*this = RouterProfile ();
}
catch (std::exception& ex)
{
LogPrint (eLogError, "Profiling: Can't read profile ", ident, " :", ex.what ());
}
}
void RouterProfile::TunnelBuildResponse (uint8_t ret)
{
UpdateTime ();
if (ret > 0)
{
m_NumTunnelsDeclined++;
m_LastDeclineTime = i2p::util::GetSecondsSinceEpoch ();
}
else
{
m_NumTunnelsAgreed++;
m_LastDeclineTime = 0;
}
}
void RouterProfile::TunnelNonReplied ()
{
m_NumTunnelsNonReplied++;
UpdateTime ();
if (m_NumTunnelsNonReplied > 2*m_NumTunnelsAgreed && m_NumTunnelsNonReplied > 3)
m_LastDeclineTime = i2p::util::GetSecondsSinceEpoch ();
}
void RouterProfile::Unreachable ()
{
m_LastUnreachableTime = i2p::util::GetSecondsSinceEpoch ();
UpdateTime ();
}
bool RouterProfile::IsLowPartcipationRate () const
{
return 4*m_NumTunnelsAgreed < m_NumTunnelsDeclined; // < 20% rate
}
bool RouterProfile::IsLowReplyRate () const
{
auto total = m_NumTunnelsAgreed + m_NumTunnelsDeclined;
return m_NumTunnelsNonReplied > 10*(total + 1);
}
bool RouterProfile::IsDeclinedRecently ()
{
if (!m_LastDeclineTime) return false;
auto ts = i2p::util::GetSecondsSinceEpoch ();
if (ts > m_LastDeclineTime + PEER_PROFILE_DECLINED_RECENTLY_INTERVAL ||
ts + PEER_PROFILE_DECLINED_RECENTLY_INTERVAL < m_LastDeclineTime)
m_LastDeclineTime = 0;
return (bool)m_LastDeclineTime;
}
bool RouterProfile::IsBad ()
{
if (IsDeclinedRecently () || IsUnreachable ()) return true;
auto isBad = IsAlwaysDeclining () || IsLowPartcipationRate () /*|| IsLowReplyRate ()*/;
if (isBad && m_NumTimesRejected > 10*(m_NumTimesTaken + 1))
{
// reset profile
m_NumTunnelsAgreed = 0;
m_NumTunnelsDeclined = 0;
m_NumTunnelsNonReplied = 0;
isBad = false;
}
if (isBad) m_NumTimesRejected++; else m_NumTimesTaken++;
return isBad;
}
bool RouterProfile::IsUnreachable ()
{
if (!m_LastUnreachableTime) return false;
auto ts = i2p::util::GetSecondsSinceEpoch ();
if (ts > m_LastUnreachableTime + PEER_PROFILE_UNREACHABLE_INTERVAL ||
ts + PEER_PROFILE_UNREACHABLE_INTERVAL < m_LastUnreachableTime)
m_LastUnreachableTime = 0;
return (bool)m_LastUnreachableTime;
}
std::shared_ptr<RouterProfile> GetRouterProfile (const IdentHash& identHash)
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{
{
std::unique_lock<std::mutex> l(g_ProfilesMutex);
auto it = g_Profiles.find (identHash);
if (it != g_Profiles.end ())
return it->second;
}
auto profile = std::make_shared<RouterProfile> ();
profile->Load (identHash); // if possible
std::unique_lock<std::mutex> l(g_ProfilesMutex);
g_Profiles.emplace (identHash, profile);
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return profile;
}
void InitProfilesStorage ()
{
g_ProfilesStorage.SetPlace(i2p::fs::GetDataDir());
g_ProfilesStorage.Init(i2p::data::GetBase64SubstitutionTable(), 64);
}
void PersistProfiles ()
{
auto ts = GetTime ();
std::list<std::pair<i2p::data::IdentHash, std::shared_ptr<RouterProfile> > > tmp;
{
std::unique_lock<std::mutex> l(g_ProfilesMutex);
for (auto it = g_Profiles.begin (); it != g_Profiles.end ();)
{
if ((ts - it->second->GetLastUpdateTime ()).total_seconds () > PEER_PROFILE_PERSIST_INTERVAL)
{
if (it->second->IsUpdated ())
tmp.push_back (std::make_pair (it->first, it->second));
it = g_Profiles.erase (it);
}
else
it++;
}
}
for (auto& it: tmp)
if (it.second) it.second->Save (it.first);
}
void SaveProfiles ()
{
std::unordered_map<i2p::data::IdentHash, std::shared_ptr<RouterProfile> > tmp;
{
std::unique_lock<std::mutex> l(g_ProfilesMutex);
tmp = g_Profiles;
g_Profiles.clear ();
}
auto ts = GetTime ();
for (auto& it: tmp)
if (it.second->IsUpdated () && (ts - it.second->GetLastUpdateTime ()).total_seconds () < PEER_PROFILE_EXPIRATION_TIMEOUT*3600)
it.second->Save (it.first);
}
void DeleteObsoleteProfiles ()
{
{
auto ts = GetTime ();
std::unique_lock<std::mutex> l(g_ProfilesMutex);
for (auto it = g_Profiles.begin (); it != g_Profiles.end ();)
{
if ((ts - it->second->GetLastUpdateTime ()).total_seconds () >= PEER_PROFILE_EXPIRATION_TIMEOUT*3600)
it = g_Profiles.erase (it);
else
it++;
}
}
struct stat st;
std::time_t now = std::time(nullptr);
std::vector<std::string> files;
g_ProfilesStorage.Traverse(files);
for (const auto& path: files) {
if (stat(path.c_str(), &st) != 0) {
LogPrint(eLogWarning, "Profiling: Can't stat(): ", path);
continue;
}
if (now - st.st_mtime >= PEER_PROFILE_EXPIRATION_TIMEOUT*3600) {
LogPrint(eLogDebug, "Profiling: Removing expired peer profile: ", path);
i2p::fs::Remove(path);
}
}
}
}
}