I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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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 "Base.h"
#include "util.h"
#include "Identity.h"
#include "Log.h"
#include "NetDb.h"
#include "ClientContext.h"
#include "AddressBook.h"
namespace i2p
{
namespace client
{
class AddressBookFilesystemStorage: public AddressBookStorage
{
public:
AddressBookFilesystemStorage ();
std::shared_ptr<const i2p::data::IdentityEx> GetAddress (const i2p::data::IdentHash& ident) const;
void AddAddress (std::shared_ptr<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";
}
boost::filesystem::path GetAddressPath (const i2p::data::IdentHash& ident) const
{
auto b32 = ident.ToBase32();
return GetPath () / (std::string ("b") + b32[0]) / (b32 + ".b32");
}
};
AddressBookFilesystemStorage::AddressBookFilesystemStorage ()
{
auto path = GetPath ();
if (!boost::filesystem::exists (path))
{
// Create directory is necessary
if (!boost::filesystem::create_directory (path))
LogPrint (eLogError, "Addressbook: failed to create addressbook directory");
}
}
std::shared_ptr<const i2p::data::IdentityEx> AddressBookFilesystemStorage::GetAddress (const i2p::data::IdentHash& ident) const
{
auto filename = GetAddressPath (ident);
if (!boost::filesystem::exists (filename))
{
boost::filesystem::create_directory (filename.parent_path ());
// try to find in main folder
auto filename1 = GetPath () / (ident.ToBase32 () + ".b32");
if (!boost::filesystem::exists (filename1))
{
boost::system::error_code ec;
boost::filesystem::rename (filename1, filename, ec);
if (ec)
LogPrint (eLogError, "Addresbook: couldn't move file ", ec.message ());
}
else
return nullptr; // address doesn't exist
}
std::ifstream f(filename.string (), 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, "Addresbook: File ", filename, " is too short. ", len);
return nullptr;
}
f.seekg(0, std::ios::beg);
uint8_t * buf = new uint8_t[len];
f.read((char *)buf, len);
auto address = std::make_shared<i2p::data::IdentityEx>(buf, len);
delete[] buf;
return address;
}
else
return nullptr;
}
void AddressBookFilesystemStorage::AddAddress (std::shared_ptr<const i2p::data::IdentityEx> address)
{
auto filename = GetAddressPath (address->GetIdentHash ());
std::ofstream f (filename.string (), std::ofstream::binary | std::ofstream::out);
if (!f.is_open ())
{
// create subdirectory
if (boost::filesystem::create_directory (filename.parent_path ()))
f.open (filename.string (), std::ofstream::binary | std::ofstream::out); // and try to open again
}
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, "Addresbook: can't open file ", filename);
}
void AddressBookFilesystemStorage::RemoveAddress (const i2p::data::IdentHash& ident)
{
auto filename = GetAddressPath (ident);
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.string (), 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, "Addressbook: ", num, " addresses loaded");
}
else
LogPrint (eLogWarning, "Addressbook: ", filename, " not found");
return num;
}
int AddressBookFilesystemStorage::Save (const std::map<std::string, i2p::data::IdentHash>& addresses)
{
if (addresses.size() == 0) {
LogPrint(eLogWarning, "Addressbook: not saving empty addressbook");
return 0;
}
int num = 0;
auto filename = GetPath () / "addresses.csv";
std::ofstream f (filename.string (), 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, "Addressbook: ", num, " addresses saved");
}
else
LogPrint (eLogError, "Addresbook: can't open file ", filename);
return num;
}
//---------------------------------------------------------------------
AddressBook::AddressBook (): m_Storage (nullptr), m_IsLoaded (false), m_IsDownloading (false),
m_DefaultSubscription (nullptr), m_SubscriptionsUpdateTimer (nullptr)
{
}
AddressBook::~AddressBook ()
{
Stop ();
}
void AddressBook::Start ()
{
LoadHosts (); /* try storage, then hosts.txt, then download */
StartSubscriptions ();
}
void AddressBook::Stop ()
{
StopSubscriptions ();
if (m_SubscriptionsUpdateTimer)
{
delete m_SubscriptionsUpdateTimer;
m_SubscriptionsUpdateTimer = nullptr;
}
if (m_IsDownloading)
{
LogPrint (eLogInfo, "Addresbook: subscriptions is downloading, abort");
for (int i = 0; i < 30; i++)
{
if (!m_IsDownloading)
{
LogPrint (eLogInfo, "Addresbook: subscriptions download complete");
break;
}
std::this_thread::sleep_for (std::chrono::seconds (1)); // wait for 1 seconds
}
LogPrint (eLogError, "Addresbook: subscription download timeout");
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)
{
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)
{
auto it = m_Addresses.find (address);
if (it != m_Addresses.end ())
return &it->second;
return nullptr;
}
void AddressBook::InsertAddress (const std::string& address, const std::string& base64)
{
auto ident = std::make_shared<i2p::data::IdentityEx>();
ident->FromBase64 (base64);
if (!m_Storage)
m_Storage = CreateStorage ();
m_Storage->AddAddress (ident);
m_Addresses[address] = ident->GetIdentHash ();
LogPrint (eLogInfo, "Addressbook: added ", address," -> ", ToAddress(ident->GetIdentHash ()));
}
void AddressBook::InsertAddress (std::shared_ptr<const i2p::data::IdentityEx> address)
{
if (!m_Storage)
m_Storage = CreateStorage ();
m_Storage->AddAddress (address);
}
std::shared_ptr<const i2p::data::IdentityEx> AddressBook::GetAddress (const std::string& address)
{
if (!m_Storage)
m_Storage = CreateStorage ();
i2p::data::IdentHash ident;
if (!GetIdentHash (address, ident)) return nullptr;
return m_Storage->GetAddress (ident);
}
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, "Addressbook: hosts.txt not found, trying 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);
auto ident = std::make_shared<i2p::data::IdentityEx> ();
if (ident->FromBase64(addr))
{
m_Addresses[name] = ident->GetIdentHash ();
m_Storage->AddAddress (ident);
numAddresses++;
}
else
LogPrint (eLogError, "Addresbook: malformed address ", addr, " for ", name);
}
}
LogPrint (eLogInfo, "Addresbook: ", 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, "Addressbook: ", m_Subscriptions.size (), " subscriptions urls loaded");
}
else
LogPrint (eLogWarning, "Addresbook: subscriptions.txt not found in datadir");
}
else
LogPrint (eLogError, "Addressbook: 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;
auto dest = i2p::client::context.GetSharedLocalDestination ();
if (dest)
{
m_SubscriptionsUpdateTimer = new boost::asio::deadline_timer (dest->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, "Addresbook: 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)
{
auto dest = i2p::client::context.GetSharedLocalDestination ();
if (!dest) return;
if (m_IsLoaded && !m_IsDownloading && dest->IsReady () && !m_Subscriptions.empty ())
{
// pick random subscription
auto ind = rand () % m_Subscriptions.size();
m_IsDownloading = true;
m_Subscriptions[ind]->CheckSubscription ();
}
else
{
// 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, "Addresbook: Downloading hosts database 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))
{
std::condition_variable newDataReceived;
std::mutex newDataReceivedMutex;
auto leaseSet = i2p::client::context.GetSharedLocalDestination ()->FindLeaseSet (ident);
if (!leaseSet)
{
std::unique_lock<std::mutex> l(newDataReceivedMutex);
i2p::client::context.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 LeaseSet request timeout expired");
i2p::client::context.GetSharedLocalDestination ()->CancelDestinationRequest (ident);
}
}
if (leaseSet)
{
std::stringstream request, response;
// standard header
request << "GET " << u.path_ << " HTTP/1.1\r\n"
<< "Host: " << u.host_ << "\r\n"
<< "Accept: */*\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 = i2p::client::context.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, "Addresbook: subscriptions request 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, "Addressbook: ", 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, "Addressbook: no updates from ", m_Link);
}
else
LogPrint (eLogWarning, "Adressbook: HTTP response ", status);
}
else
LogPrint (eLogError, "Addressbook: address ", u.host_, " not found");
}
else
LogPrint (eLogError, "Addressbook: Can't resolve ", u.host_);
if (!success)
LogPrint (eLogError, "Addressbook: download failed");
m_Book.DownloadComplete (success);
}
}
}