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I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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i2pd/core/AddressBook.cpp

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#include <string.h>
#include <inttypes.h>
#include <string>
#include <map>
#include <fstream>
#include <chrono>
#include <condition_variable>
#include <boost/filesystem.hpp>
#include <boost/lexical_cast.hpp>
#include <cryptopp/osrng.h>
#include "util/base64.h"
#include "util/util.h"
#include "Identity.h"
#include "util/Log.h"
#include "NetworkDatabase.h"
#include "AddressBook.h"
#include "Destination.h"
namespace i2p
{
namespace client
{
class AddressBookFilesystemStorage: public AddressBookStorage
{
public:
AddressBookFilesystemStorage ();
bool GetAddress (const i2p::data::IdentHash& ident, i2p::data::IdentityEx& address) const;
void AddAddress (const i2p::data::IdentityEx& address);
void RemoveAddress (const i2p::data::IdentHash& ident);
int Load (std::map<std::string, i2p::data::IdentHash>& addresses);
int Save (const std::map<std::string, i2p::data::IdentHash>& addresses);
private:
boost::filesystem::path GetPath () const { return i2p::util::filesystem::GetDefaultDataDir() / "addressbook"; };
};
AddressBookFilesystemStorage::AddressBookFilesystemStorage ()
{
auto path = GetPath ();
if (!boost::filesystem::exists (path))
{
// Create directory is necessary
if (!boost::filesystem::create_directory (path))
LogPrint (eLogError, "Failed to create addressbook directory");
}
}
bool AddressBookFilesystemStorage::GetAddress (const i2p::data::IdentHash& ident, i2p::data::IdentityEx& address) const
{
auto filename = GetPath () / (ident.ToBase32() + ".b32");
std::ifstream f(filename.c_str (), std::ifstream::binary);
if (f.is_open ())
{
f.seekg (0,std::ios::end);
size_t len = f.tellg ();
if (len < i2p::data::DEFAULT_IDENTITY_SIZE)
{
LogPrint (eLogError, "File ", filename, " is too short. ", len);
return false;
}
f.seekg(0, std::ios::beg);
uint8_t * buf = new uint8_t[len];
f.read((char *)buf, len);
address.FromBuffer (buf, len);
delete[] buf;
return true;
}
else
return false;
}
void AddressBookFilesystemStorage::AddAddress (const i2p::data::IdentityEx& address)
{
auto filename = GetPath () / (address.GetIdentHash ().ToBase32() + ".b32");
std::ofstream f (filename.c_str (), std::ofstream::binary | std::ofstream::out);
if (f.is_open ())
{
size_t len = address.GetFullLen ();
uint8_t * buf = new uint8_t[len];
address.ToBuffer (buf, len);
f.write ((char *)buf, len);
delete[] buf;
}
else
LogPrint (eLogError, "Can't open file ", filename);
}
void AddressBookFilesystemStorage::RemoveAddress (const i2p::data::IdentHash& ident)
{
auto filename = GetPath () / (ident.ToBase32() + ".b32");
if (boost::filesystem::exists (filename))
boost::filesystem::remove (filename);
}
int AddressBookFilesystemStorage::Load (std::map<std::string, i2p::data::IdentHash>& addresses)
{
int num = 0;
auto filename = GetPath () / "addresses.csv";
std::ifstream f (filename.c_str (), std::ofstream::in); // in text mode
if (f.is_open ())
{
addresses.clear ();
while (!f.eof ())
{
std::string s;
getline(f, s);
if (!s.length())
continue; // skip empty line
size_t pos = s.find(',');
if (pos != std::string::npos)
{
std::string name = s.substr(0, pos++);
std::string addr = s.substr(pos);
i2p::data::IdentHash ident;
ident.FromBase32 (addr);
addresses[name] = ident;
num++;
}
}
LogPrint (eLogInfo, num, " addresses loaded");
}
else
LogPrint (eLogWarning, filename, " not found");
return num;
}
int AddressBookFilesystemStorage::Save (const std::map<std::string, i2p::data::IdentHash>& addresses)
{
int num = 0;
auto filename = GetPath () / "addresses.csv";
std::ofstream f (filename.c_str (), std::ofstream::out); // in text mode
if (f.is_open ())
{
for (auto it: addresses)
{
f << it.first << "," << it.second.ToBase32 () << std::endl;
num++;
}
LogPrint (eLogInfo, num, " addresses saved");
}
else
LogPrint (eLogError, "Can't open file ", filename);
return num;
}
//---------------------------------------------------------------------
AddressBook::AddressBook ()
: m_Storage (nullptr), m_IsLoaded (false), m_IsDownloading (false),
m_DefaultSubscription (nullptr), m_SubscriptionsUpdateTimer (nullptr),
m_SharedLocalDestination(nullptr)
{
}
AddressBook::~AddressBook ()
{
Stop ();
}
void AddressBook::Start (ClientDestination* local_destination)
{
m_SharedLocalDestination = local_destination;
StartSubscriptions ();
}
void AddressBook::Stop ()
{
StopSubscriptions ();
if (m_SubscriptionsUpdateTimer)
{
delete m_SubscriptionsUpdateTimer;
m_SubscriptionsUpdateTimer = nullptr;
}
if (m_IsDownloading)
{
LogPrint (eLogInfo, "Subscription is downloading. Waiting for temination...");
for (int i = 0; i < 30; i++)
{
if (!m_IsDownloading)
{
LogPrint (eLogInfo, "Subscription download complete");
break;
}
std::this_thread::sleep_for (std::chrono::seconds (1)); // wait for 1 seconds
}
LogPrint (eLogError, "Subscription download hangs");
m_IsDownloading = false;
}
if (m_Storage)
{
m_Storage->Save (m_Addresses);
delete m_Storage;
m_Storage = nullptr;
}
if (m_DefaultSubscription)
{
delete m_DefaultSubscription;
m_DefaultSubscription = nullptr;
}
for (auto it: m_Subscriptions)
delete it;
m_Subscriptions.clear ();
}
AddressBookStorage * AddressBook::CreateStorage ()
{
return new AddressBookFilesystemStorage ();
}
bool AddressBook::GetIdentHash (const std::string& address, i2p::data::IdentHash& ident)
{
auto pos = address.find(".b32.i2p");
if (pos != std::string::npos)
{
i2p::util::Base32ToByteStream (address.c_str(), pos, ident, 32);
return true;
}
else
{
pos = address.find (".i2p");
if (pos != std::string::npos)
{
auto identHash = FindAddress (address);
if (identHash)
{
ident = *identHash;
return true;
}
else
return false;
}
}
// if not .b32 we assume full base64 address
i2p::data::IdentityEx dest;
if (!dest.FromBase64 (address))
return false;
ident = dest.GetIdentHash ();
return true;
}
const i2p::data::IdentHash * AddressBook::FindAddress (const std::string& address)
{
if (!m_IsLoaded)
LoadHosts ();
if (m_IsLoaded)
{
auto it = m_Addresses.find (address);
if (it != m_Addresses.end ())
return &it->second;
}
return nullptr;
}
ClientDestination* AddressBook::getSharedLocalDestination() const
{
return m_SharedLocalDestination;
}
void AddressBook::InsertAddress (const std::string& address, const std::string& base64)
{
i2p::data::IdentityEx ident;
ident.FromBase64 (base64);
if (!m_Storage)
m_Storage = CreateStorage ();
m_Storage->AddAddress (ident);
m_Addresses[address] = ident.GetIdentHash ();
LogPrint (address,"->", ToAddress(ident.GetIdentHash ()), " added");
}
void AddressBook::InsertAddress (const i2p::data::IdentityEx& address)
{
if (!m_Storage)
m_Storage = CreateStorage ();
m_Storage->AddAddress (address);
}
bool AddressBook::GetAddress (const std::string& address, i2p::data::IdentityEx& identity)
{
if (!m_Storage)
m_Storage = CreateStorage ();
i2p::data::IdentHash ident;
if (!GetIdentHash (address, ident)) return false;
return m_Storage->GetAddress (ident, identity);
}
void AddressBook::LoadHosts ()
{
if (!m_Storage)
m_Storage = CreateStorage ();
if (m_Storage->Load (m_Addresses) > 0)
{
m_IsLoaded = true;
return;
}
// try hosts.txt first
std::ifstream f (i2p::util::filesystem::GetFullPath ("hosts.txt").c_str (), std::ofstream::in); // in text mode
if (f.is_open ())
{
LoadHostsFromStream (f);
m_IsLoaded = true;
}
else
{
// if not found download it from http://i2p-projekt.i2p/hosts.txt
LogPrint (eLogInfo, "hosts.txt not found. Try to download it from default subscription...");
if (!m_IsDownloading)
{
m_IsDownloading = true;
if (!m_DefaultSubscription)
m_DefaultSubscription = new AddressBookSubscription (*this, DEFAULT_SUBSCRIPTION_ADDRESS);
m_DefaultSubscription->CheckSubscription ();
}
}
}
void AddressBook::LoadHostsFromStream (std::istream& f)
{
std::unique_lock<std::mutex> l(m_AddressBookMutex);
int numAddresses = 0;
std::string s;
while (!f.eof ())
{
getline(f, s);
if (!s.length())
continue; // skip empty line
size_t pos = s.find('=');
if (pos != std::string::npos)
{
std::string name = s.substr(0, pos++);
std::string addr = s.substr(pos);
i2p::data::IdentityEx ident;
if (ident.FromBase64(addr))
{
m_Addresses[name] = ident.GetIdentHash ();
m_Storage->AddAddress (ident);
numAddresses++;
}
else
LogPrint (eLogError, "Malformed address ", addr, " for ", name);
}
}
LogPrint (eLogInfo, numAddresses, " addresses processed");
if (numAddresses > 0)
{
m_IsLoaded = true;
m_Storage->Save (m_Addresses);
}
}
void AddressBook::LoadSubscriptions ()
{
if (!m_Subscriptions.size ())
{
std::ifstream f (i2p::util::filesystem::GetFullPath ("subscriptions.txt").c_str (), std::ofstream::in); // in text mode
if (f.is_open ())
{
std::string s;
while (!f.eof ())
{
getline(f, s);
if (!s.length()) continue; // skip empty line
m_Subscriptions.push_back (new AddressBookSubscription (*this, s));
}
LogPrint (eLogInfo, m_Subscriptions.size (), " subscriptions loaded");
}
else
LogPrint (eLogWarning, "subscriptions.txt not found");
}
else
LogPrint (eLogError, "Subscriptions already loaded");
}
void AddressBook::DownloadComplete (bool success)
{
m_IsDownloading = false;
if (m_SubscriptionsUpdateTimer)
{
m_SubscriptionsUpdateTimer->expires_from_now (boost::posix_time::minutes(
success ? CONTINIOUS_SUBSCRIPTION_UPDATE_TIMEOUT : CONTINIOUS_SUBSCRIPTION_RETRY_TIMEOUT));
m_SubscriptionsUpdateTimer->async_wait (std::bind (&AddressBook::HandleSubscriptionsUpdateTimer,
this, std::placeholders::_1));
}
}
void AddressBook::StartSubscriptions ()
{
LoadSubscriptions ();
if (!m_Subscriptions.size ()) return;
if (m_SharedLocalDestination)
{
m_SubscriptionsUpdateTimer = new boost::asio::deadline_timer(
m_SharedLocalDestination->GetService()
);
m_SubscriptionsUpdateTimer->expires_from_now(
boost::posix_time::minutes(INITIAL_SUBSCRIPTION_UPDATE_TIMEOUT)
);
m_SubscriptionsUpdateTimer->async_wait(std::bind(
&AddressBook::HandleSubscriptionsUpdateTimer,
this, std::placeholders::_1
));
}
else
LogPrint (eLogError, "Can't start subscriptions: missing shared local destination");
}
void AddressBook::StopSubscriptions ()
{
if (m_SubscriptionsUpdateTimer)
m_SubscriptionsUpdateTimer->cancel ();
}
void AddressBook::HandleSubscriptionsUpdateTimer (const boost::system::error_code& ecode)
{
if (ecode != boost::asio::error::operation_aborted)
{
if (!m_SharedLocalDestination)
return; // TODO: error handling
if (m_IsLoaded && !m_IsDownloading && m_SharedLocalDestination->IsReady ())
{
// pick random subscription
CryptoPP::AutoSeededRandomPool rnd;
auto ind = rnd.GenerateWord32 (0, m_Subscriptions.size() - 1);
m_IsDownloading = true;
m_Subscriptions[ind]->CheckSubscription ();
}
else
{
if (!m_IsLoaded)
LoadHosts ();
// try it again later
m_SubscriptionsUpdateTimer->expires_from_now (boost::posix_time::minutes(INITIAL_SUBSCRIPTION_RETRY_TIMEOUT));
m_SubscriptionsUpdateTimer->async_wait (std::bind (&AddressBook::HandleSubscriptionsUpdateTimer,
this, std::placeholders::_1));
}
}
}
AddressBookSubscription::AddressBookSubscription (AddressBook& book, const std::string& link):
m_Book (book), m_Link (link)
{
}
void AddressBookSubscription::CheckSubscription ()
{
std::thread load_hosts(&AddressBookSubscription::Request, this);
load_hosts.detach(); // TODO: use join
}
void AddressBookSubscription::Request ()
{
// must be run in separate thread
LogPrint (eLogInfo, "Downloading hosts from ", m_Link, " ETag: ", m_Etag, " Last-Modified: ", m_LastModified);
bool success = false;
i2p::util::http::url u (m_Link);
i2p::data::IdentHash ident;
if (m_Book.GetIdentHash (u.host_, ident) && m_Book.getSharedLocalDestination())
{
std::condition_variable newDataReceived;
std::mutex newDataReceivedMutex;
auto leaseSet = m_Book.getSharedLocalDestination()->FindLeaseSet (ident);
if (!leaseSet)
{
std::unique_lock<std::mutex> l(newDataReceivedMutex);
m_Book.getSharedLocalDestination()->RequestDestination (ident,
[&newDataReceived, &leaseSet](std::shared_ptr<i2p::data::LeaseSet> ls)
{
leaseSet = ls;
newDataReceived.notify_all ();
});
if (newDataReceived.wait_for (l, std::chrono::seconds (SUBSCRIPTION_REQUEST_TIMEOUT)) == std::cv_status::timeout)
LogPrint (eLogError, "Subscription LeseseSet request timeout expired");
}
if (leaseSet)
{
std::stringstream request, response;
// standard header
request << "GET " << u.path_ << " HTTP/1.1\r\nHost: " << u.host_
<< "\r\nAccept: */*\r\n" << "User-Agent: Wget/1.11.4\r\n" << "Connection: close\r\n";
if (m_Etag.length () > 0) // etag
request << i2p::util::http::IF_NONE_MATCH << ": \"" << m_Etag << "\"\r\n";
if (m_LastModified.length () > 0) // if-modfief-since
request << i2p::util::http::IF_MODIFIED_SINCE << ": " << m_LastModified << "\r\n";
request << "\r\n"; // end of header
auto stream = m_Book.getSharedLocalDestination()->CreateStream (leaseSet, u.port_);
stream->Send ((uint8_t *)request.str ().c_str (), request.str ().length ());
uint8_t buf[4096];
bool end = false;
while (!end)
{
stream->AsyncReceive (boost::asio::buffer (buf, 4096),
[&](const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (bytes_transferred)
response.write ((char *)buf, bytes_transferred);
if (ecode == boost::asio::error::timed_out || !stream->IsOpen ())
end = true;
newDataReceived.notify_all ();
},
30); // wait for 30 seconds
std::unique_lock<std::mutex> l(newDataReceivedMutex);
if (newDataReceived.wait_for (l, std::chrono::seconds (SUBSCRIPTION_REQUEST_TIMEOUT)) == std::cv_status::timeout)
LogPrint (eLogError, "Subscription timeout expired");
}
// process remaining buffer
while (size_t len = stream->ReadSome (buf, 4096))
response.write ((char *)buf, len);
// parse response
std::string version;
response >> version; // HTTP version
int status = 0;
response >> status; // status
if (status == 200) // OK
{
bool isChunked = false;
std::string header, statusMessage;
std::getline (response, statusMessage);
// read until new line meaning end of header
while (!response.eof () && header != "\r")
{
std::getline (response, header);
auto colon = header.find (':');
if (colon != std::string::npos)
{
std::string field = header.substr (0, colon);
header.resize (header.length () - 1); // delete \r
if (field == i2p::util::http::ETAG)
m_Etag = header.substr (colon + 1);
else if (field == i2p::util::http::LAST_MODIFIED)
m_LastModified = header.substr (colon + 1);
else if (field == i2p::util::http::TRANSFER_ENCODING)
isChunked = !header.compare (colon + 1, std::string::npos, "chunked");
}
}
LogPrint (eLogInfo, m_Link, " ETag: ", m_Etag, " Last-Modified: ", m_LastModified);
if (!response.eof ())
{
success = true;
if (!isChunked)
m_Book.LoadHostsFromStream (response);
else
{
// merge chunks
std::stringstream merged;
i2p::util::http::MergeChunkedResponse (response, merged);
m_Book.LoadHostsFromStream (merged);
}
}
}
else if (status == 304)
{
success = true;
LogPrint (eLogInfo, "No updates from ", m_Link);
}
else
LogPrint (eLogWarning, "Adressbook HTTP response ", status);
}
else
LogPrint (eLogError, "Address ", u.host_, " not found");
}
else
LogPrint (eLogError, "Can't resolve ", u.host_);
LogPrint (eLogInfo, "Download complete ", success ? "Success" : "Failed");
m_Book.DownloadComplete (success);
}
}
}