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SAM.cpp
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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 <string.h>
#include <stdio.h>
#ifdef _MSC_VER
#include <stdlib.h>
#endif
#include "Base.h"
#include "Identity.h"
#include "Log.h"
#include "Destination.h"
#include "ClientContext.h"
#include "util.h"
#include "SAM.h"
namespace i2p
{
namespace client
{
SAMSocket::SAMSocket (SAMBridge& owner):
m_Owner (owner), m_Socket(owner.GetService()), m_Timer (m_Owner.GetService ()),
m_BufferOffset (0),
m_SocketType (eSAMSocketTypeUnknown), m_IsSilent (false),
m_IsAccepting (false), m_Stream (nullptr)
{
}
SAMSocket::~SAMSocket ()
{
m_Stream = nullptr;
}
void SAMSocket::Terminate (const char* reason)
{
if(m_Stream)
{
m_Stream->AsyncClose ();
m_Stream = nullptr;
}
auto Session = m_Owner.FindSession(m_ID);
switch (m_SocketType)
{
case eSAMSocketTypeSession:
m_Owner.CloseSession (m_ID);
break;
case eSAMSocketTypeStream:
{
break;
}
case eSAMSocketTypeAcceptor:
case eSAMSocketTypeForward:
{
if (Session)
{
if (m_IsAccepting && Session->GetLocalDestination ())
Session->GetLocalDestination ()->StopAcceptingStreams ();
}
break;
}
default: ;
}
m_SocketType = eSAMSocketTypeTerminated;
if (m_Socket.is_open ())
{
boost::system::error_code ec;
m_Socket.shutdown (boost::asio::ip::tcp::socket::shutdown_both, ec);
m_Socket.close ();
}
m_Owner.RemoveSocket(shared_from_this());
}
void SAMSocket::ReceiveHandshake ()
{
m_Socket.async_read_some (boost::asio::buffer(m_Buffer, SAM_SOCKET_BUFFER_SIZE),
std::bind(&SAMSocket::HandleHandshakeReceived, shared_from_this (),
std::placeholders::_1, std::placeholders::_2));
}
static bool SAMVersionAcceptable(const std::string & ver)
{
return ver == "3.0" || ver == "3.1";
}
static bool SAMVersionTooLow(const std::string & ver)
{
return ver.size() && ver[0] < '3';
}
static bool SAMVersionTooHigh(const std::string & ver)
{
return ver.size() && ver > "3.1";
}
void SAMSocket::HandleHandshakeReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
LogPrint (eLogError, "SAM: Handshake read error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ("SAM: handshake read error");
}
else
{
m_Buffer[bytes_transferred] = 0;
char * eol = (char *)memchr (m_Buffer, '\n', bytes_transferred);
if (eol)
*eol = 0;
LogPrint (eLogDebug, "SAM: Handshake ", m_Buffer);
char * separator = strchr (m_Buffer, ' ');
if (separator)
{
separator = strchr (separator + 1, ' ');
if (separator)
*separator = 0;
}
if (!strcmp (m_Buffer, SAM_HANDSHAKE))
{
std::string maxver("3.1");
std::string minver("3.0");
// try to find MIN and MAX, 3.0 if not found
if (separator)
{
separator++;
std::map<std::string, std::string> params;
ExtractParams (separator, params);
auto it = params.find (SAM_PARAM_MAX);
if (it != params.end ())
maxver = it->second;
it = params.find(SAM_PARAM_MIN);
if (it != params.end ())
minver = it->second;
}
// version negotiation
std::string version;
if (SAMVersionAcceptable(maxver))
{
version = maxver;
}
else if (SAMVersionAcceptable(minver))
{
version = minver;
}
else if (SAMVersionTooLow(minver) && SAMVersionTooHigh(maxver))
{
version = "3.0";
}
if (SAMVersionAcceptable(version))
{
#ifdef _MSC_VER
size_t l = sprintf_s (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_HANDSHAKE_REPLY, version.c_str ());
#else
size_t l = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_HANDSHAKE_REPLY, version.c_str ());
#endif
boost::asio::async_write (m_Socket, boost::asio::buffer (m_Buffer, l), boost::asio::transfer_all (),
std::bind(&SAMSocket::HandleHandshakeReplySent, shared_from_this (),
std::placeholders::_1, std::placeholders::_2));
}
else
SendMessageReply (SAM_HANDSHAKE_NOVERSION, strlen (SAM_HANDSHAKE_NOVERSION), true);
}
else
{
LogPrint (eLogError, "SAM: Handshake mismatch");
Terminate ("SAM: handshake mismatch");
}
}
}
bool SAMSocket::IsSession(const std::string & id) const
{
return id == m_ID;
}
void SAMSocket::HandleHandshakeReplySent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
LogPrint (eLogError, "SAM: Handshake reply send error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ("SAM: handshake reply send error");
}
else
{
m_Socket.async_read_some (boost::asio::buffer(m_Buffer, SAM_SOCKET_BUFFER_SIZE),
std::bind(&SAMSocket::HandleMessage, shared_from_this (),
std::placeholders::_1, std::placeholders::_2));
}
}
void SAMSocket::SendMessageReply (const char * msg, size_t len, bool close)
{
LogPrint (eLogDebug, "SAMSocket::SendMessageReply, close=",close?"true":"false", " reason: ", msg);
if (!m_IsSilent || m_SocketType == eSAMSocketTypeForward)
boost::asio::async_write (m_Socket, boost::asio::buffer (msg, len), boost::asio::transfer_all (),
std::bind(&SAMSocket::HandleMessageReplySent, shared_from_this (),
std::placeholders::_1, std::placeholders::_2, close));
else
{
if (close)
Terminate ("SAMSocket::SendMessageReply(close=true)");
else
Receive ();
}
}
void SAMSocket::HandleMessageReplySent (const boost::system::error_code& ecode, std::size_t bytes_transferred, bool close)
{
if (ecode)
{
LogPrint (eLogError, "SAM: Reply send error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ("SAM: reply send error");
}
else
{
if (close)
Terminate ("SAMSocket::HandleMessageReplySent(close=true)");
else
Receive ();
}
}
void SAMSocket::HandleMessage (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
LogPrint (eLogError, "SAM: Read error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ("SAM: read error");
}
else if (m_SocketType == eSAMSocketTypeStream)
HandleReceived (ecode, bytes_transferred);
else
{
bytes_transferred += m_BufferOffset;
m_BufferOffset = 0;
m_Buffer[bytes_transferred] = 0;
char * eol = (char *)memchr (m_Buffer, '\n', bytes_transferred);
if (eol)
{
if (eol > m_Buffer && eol[-1] == '\r') eol--;
*eol = 0;
char * separator = strchr (m_Buffer, ' ');
if (separator)
{
separator = strchr (separator + 1, ' ');
if (separator)
*separator = 0;
else
separator = eol;
if (!strcmp (m_Buffer, SAM_SESSION_CREATE))
ProcessSessionCreate (separator + 1, bytes_transferred - (separator - m_Buffer) - 1);
else if (!strcmp (m_Buffer, SAM_STREAM_CONNECT))
ProcessStreamConnect (separator + 1, bytes_transferred - (separator - m_Buffer) - 1, bytes_transferred - (eol - m_Buffer) - 1);
else if (!strcmp (m_Buffer, SAM_STREAM_ACCEPT))
ProcessStreamAccept (separator + 1, bytes_transferred - (separator - m_Buffer) - 1);
else if (!strcmp (m_Buffer, SAM_STREAM_FORWARD))
ProcessStreamForward (separator + 1, bytes_transferred - (separator - m_Buffer) - 1);
else if (!strcmp (m_Buffer, SAM_DEST_GENERATE))
ProcessDestGenerate (separator + 1, bytes_transferred - (separator - m_Buffer) - 1);
else if (!strcmp (m_Buffer, SAM_NAMING_LOOKUP))
ProcessNamingLookup (separator + 1, bytes_transferred - (separator - m_Buffer) - 1);
else if (!strcmp (m_Buffer, SAM_SESSION_ADD))
ProcessSessionAdd (separator + 1, bytes_transferred - (separator - m_Buffer) - 1);
else if (!strcmp (m_Buffer, SAM_SESSION_REMOVE))
ProcessSessionRemove (separator + 1, bytes_transferred - (separator - m_Buffer) - 1);
else if (!strcmp (m_Buffer, SAM_DATAGRAM_SEND) || !strcmp (m_Buffer, SAM_RAW_SEND))
{
size_t len = bytes_transferred - (separator - m_Buffer) - 1;
size_t processed = ProcessDatagramSend (separator + 1, len, eol + 1);
if (processed < len)
{
m_BufferOffset = len - processed;
if (processed > 0)
memmove (m_Buffer, separator + 1 + processed, m_BufferOffset);
else
{
// restore string back
*separator = ' ';
*eol = '\n';
}
}
// since it's SAM v1 reply is not expected
Receive ();
}
else
{
LogPrint (eLogError, "SAM: Unexpected message ", m_Buffer);
Terminate ("SAM: unexpected message");
}
}
else
{
LogPrint (eLogError, "SAM: Malformed message ", m_Buffer);
Terminate ("malformed message");
}
}
else
{
LogPrint (eLogWarning, "SAM: Incomplete message ", bytes_transferred);
m_BufferOffset = bytes_transferred;
// try to receive remaining message
Receive ();
}
}
}
static bool IsAcceptableSessionName(const std::string & str)
{
auto itr = str.begin();
while(itr != str.end())
{
char ch = *itr;
++itr;
if (ch == '<' || ch == '>' || ch == '"' || ch == '\'' || ch == '/')
return false;
}
return true;
}
void SAMSocket::ProcessSessionCreate (char * buf, size_t len)
{
LogPrint (eLogDebug, "SAM: Session create: ", buf);
std::map<std::string, std::string> params;
ExtractParams (buf, params);
std::string& style = params[SAM_PARAM_STYLE];
std::string& id = params[SAM_PARAM_ID];
std::string& destination = params[SAM_PARAM_DESTINATION];
if(!IsAcceptableSessionName(id))
{
// invalid session id
SendMessageReply (SAM_SESSION_CREATE_INVALID_ID, strlen(SAM_SESSION_CREATE_INVALID_ID), true);
return;
}
m_ID = id;
if (m_Owner.FindSession (id))
{
// session exists
SendMessageReply (SAM_SESSION_CREATE_DUPLICATED_ID, strlen(SAM_SESSION_CREATE_DUPLICATED_ID), true);
return;
}
SAMSessionType type = eSAMSessionTypeUnknown;
if (style == SAM_VALUE_STREAM) type = eSAMSessionTypeStream;
else if (style == SAM_VALUE_DATAGRAM) type = eSAMSessionTypeDatagram;
else if (style == SAM_VALUE_RAW) type = eSAMSessionTypeRaw;
else if (style == SAM_VALUE_MASTER) type = eSAMSessionTypeMaster;
if (type == eSAMSessionTypeUnknown)
{
// unknown style
SendSessionI2PError("Unknown STYLE");
return;
}
std::shared_ptr<boost::asio::ip::udp::endpoint> forward = nullptr;
if ((type == eSAMSessionTypeDatagram || type == eSAMSessionTypeRaw) &&
params.find(SAM_PARAM_HOST) != params.end() && params.find(SAM_PARAM_PORT) != params.end())
{
// udp forward selected
boost::system::error_code e;
// TODO: support hostnames in udp forward
auto addr = boost::asio::ip::address::from_string(params[SAM_PARAM_HOST], e);
if (e)
{
// not an ip address
SendSessionI2PError("Invalid IP Address in HOST");
return;
}
auto port = std::stoi(params[SAM_PARAM_PORT]);
if (port == -1)
{
SendSessionI2PError("Invalid port");
return;
}
forward = std::make_shared<boost::asio::ip::udp::endpoint>(addr, port);
}
//ensure we actually received a destination
if (destination.empty())
{
SendMessageReply (SAM_SESSION_STATUS_INVALID_KEY, strlen(SAM_SESSION_STATUS_INVALID_KEY), true);
return;
}
if (destination != SAM_VALUE_TRANSIENT)
{
//ensure it's a base64 string
i2p::data::PrivateKeys keys;
if (!keys.FromBase64(destination))
{
SendMessageReply(SAM_SESSION_STATUS_INVALID_KEY, strlen(SAM_SESSION_STATUS_INVALID_KEY), true);
return;
}
}
// create destination
auto session = m_Owner.CreateSession (id, type, destination == SAM_VALUE_TRANSIENT ? "" : destination, ¶ms);
if (session)
{
m_SocketType = eSAMSocketTypeSession;
if (type == eSAMSessionTypeDatagram || type == eSAMSessionTypeRaw)
{
session->UDPEndpoint = forward;
auto dest = session->GetLocalDestination ()->CreateDatagramDestination ();
if (type == eSAMSessionTypeDatagram)
dest->SetReceiver (std::bind (&SAMSocket::HandleI2PDatagramReceive, shared_from_this (),
std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4, std::placeholders::_5));
else // raw
dest->SetRawReceiver (std::bind (&SAMSocket::HandleI2PRawDatagramReceive, shared_from_this (),
std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4));
}
if (session->GetLocalDestination ()->IsReady ())
SendSessionCreateReplyOk ();
else
{
m_Timer.expires_from_now (boost::posix_time::seconds(SAM_SESSION_READINESS_CHECK_INTERVAL));
m_Timer.async_wait (std::bind (&SAMSocket::HandleSessionReadinessCheckTimer,
shared_from_this (), std::placeholders::_1));
}
}
else
SendMessageReply (SAM_SESSION_CREATE_DUPLICATED_DEST, strlen(SAM_SESSION_CREATE_DUPLICATED_DEST), true);
}
void SAMSocket::HandleSessionReadinessCheckTimer (const boost::system::error_code& ecode)
{
if (ecode != boost::asio::error::operation_aborted)
{
if (m_Socket.is_open ())
{
auto session = m_Owner.FindSession(m_ID);
if(session)
{
if (session->GetLocalDestination ()->IsReady ())
SendSessionCreateReplyOk ();
else
{
m_Timer.expires_from_now (boost::posix_time::seconds(SAM_SESSION_READINESS_CHECK_INTERVAL));
m_Timer.async_wait (std::bind (&SAMSocket::HandleSessionReadinessCheckTimer,
shared_from_this (), std::placeholders::_1));
}
}
}
else
Terminate ("SAM: session socket closed");
}
}
void SAMSocket::SendSessionCreateReplyOk ()
{
auto session = m_Owner.FindSession(m_ID);
if (session)
{
uint8_t buf[1024];
char priv[1024];
size_t l = session->GetLocalDestination ()->GetPrivateKeys ().ToBuffer (buf, 1024);
size_t l1 = i2p::data::ByteStreamToBase64 (buf, l, priv, 1024);
priv[l1] = 0;
#ifdef _MSC_VER
size_t l2 = sprintf_s (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_SESSION_CREATE_REPLY_OK, priv);
#else
size_t l2 = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_SESSION_CREATE_REPLY_OK, priv);
#endif
SendMessageReply (m_Buffer, l2, false);
}
}
void SAMSocket::ProcessStreamConnect (char * buf, size_t len, size_t rem)
{
LogPrint (eLogDebug, "SAM: Stream connect: ", buf);
if ( m_SocketType != eSAMSocketTypeUnknown)
{
SendSessionI2PError ("Socket already in use");
return;
}
std::map<std::string, std::string> params;
ExtractParams (buf, params);
std::string& id = params[SAM_PARAM_ID];
std::string& destination = params[SAM_PARAM_DESTINATION];
std::string& silent = params[SAM_PARAM_SILENT];
if (silent == SAM_VALUE_TRUE) m_IsSilent = true;
m_ID = id;
auto session = m_Owner.FindSession (id);
if (session)
{
if (rem > 0) // handle follow on data
{
memmove (m_Buffer, buf + len + 1, rem); // buf is a pointer to m_Buffer's content
m_BufferOffset = rem;
}
else
m_BufferOffset = 0;
std::shared_ptr<const Address> addr;
if (destination.find(".i2p") != std::string::npos)
addr = context.GetAddressBook().GetAddress (destination);
else
{
auto dest = std::make_shared<i2p::data::IdentityEx> ();
size_t l = dest->FromBase64(destination);
if (l > 0)
{
context.GetAddressBook().InsertFullAddress(dest);
addr = std::make_shared<Address>(dest->GetIdentHash ());
}
}
if (addr && addr->IsValid ())
{
if (addr->IsIdentHash ())
{
auto leaseSet = session->GetLocalDestination ()->FindLeaseSet(addr->identHash);
if (leaseSet)
Connect(leaseSet, session);
else
{
session->GetLocalDestination ()->RequestDestination(addr->identHash,
std::bind(&SAMSocket::HandleConnectLeaseSetRequestComplete,
shared_from_this(), std::placeholders::_1));
}
}
else // B33
session->GetLocalDestination ()->RequestDestinationWithEncryptedLeaseSet (addr->blindedPublicKey,
std::bind(&SAMSocket::HandleConnectLeaseSetRequestComplete,
shared_from_this(), std::placeholders::_1));
}
else
SendMessageReply (SAM_STREAM_STATUS_INVALID_KEY, strlen(SAM_STREAM_STATUS_INVALID_KEY), true);
}
else
SendMessageReply (SAM_STREAM_STATUS_INVALID_ID, strlen(SAM_STREAM_STATUS_INVALID_ID), true);
}
void SAMSocket::Connect (std::shared_ptr<const i2p::data::LeaseSet> remote, std::shared_ptr<SAMSession> session)
{
if (!session) session = m_Owner.FindSession(m_ID);
if (session)
{
m_SocketType = eSAMSocketTypeStream;
m_Stream = session->GetLocalDestination ()->CreateStream (remote);
if (m_Stream)
{
m_Stream->Send ((uint8_t *)m_Buffer, m_BufferOffset); // connect and send
m_BufferOffset = 0;
I2PReceive ();
SendMessageReply (SAM_STREAM_STATUS_OK, strlen(SAM_STREAM_STATUS_OK), false);
}
else
SendMessageReply (SAM_STREAM_STATUS_INVALID_ID, strlen(SAM_STREAM_STATUS_INVALID_ID), true);
}
else
SendMessageReply (SAM_STREAM_STATUS_INVALID_ID, strlen(SAM_STREAM_STATUS_INVALID_ID), true);
}
void SAMSocket::HandleConnectLeaseSetRequestComplete (std::shared_ptr<i2p::data::LeaseSet> leaseSet)
{
if (leaseSet)
Connect (leaseSet);
else
{
LogPrint (eLogError, "SAM: Destination to connect not found");
SendMessageReply (SAM_STREAM_STATUS_CANT_REACH_PEER, strlen(SAM_STREAM_STATUS_CANT_REACH_PEER), true);
}
}
void SAMSocket::ProcessStreamAccept (char * buf, size_t len)
{
LogPrint (eLogDebug, "SAM: Stream accept: ", buf);
if ( m_SocketType != eSAMSocketTypeUnknown)
{
SendSessionI2PError ("Socket already in use");
return;
}
std::map<std::string, std::string> params;
ExtractParams (buf, params);
std::string& id = params[SAM_PARAM_ID];
std::string& silent = params[SAM_PARAM_SILENT];
if (silent == SAM_VALUE_TRUE) m_IsSilent = true;
m_ID = id;
auto session = m_Owner.FindSession (id);
if (session)
{
m_SocketType = eSAMSocketTypeAcceptor;
if (!session->GetLocalDestination ()->IsAcceptingStreams ())
{
m_IsAccepting = true;
SendMessageReply (SAM_STREAM_STATUS_OK, strlen(SAM_STREAM_STATUS_OK), false);
session->GetLocalDestination ()->AcceptOnce (std::bind (&SAMSocket::HandleI2PAccept, shared_from_this (), std::placeholders::_1));
}
else // already accepting
{
// TODO: implement queue
LogPrint (eLogInfo, "SAM: Session ", m_ID, " is already accepting");
SendStreamI2PError ("Already accepting");
}
}
else
SendMessageReply (SAM_STREAM_STATUS_INVALID_ID, strlen(SAM_STREAM_STATUS_INVALID_ID), true);
}
void SAMSocket::ProcessStreamForward (char * buf, size_t len)
{
LogPrint (eLogDebug, "SAM: Stream forward: ", buf);
std::map<std::string, std::string> params;
ExtractParams (buf, params);
std::string& id = params[SAM_PARAM_ID];
auto session = m_Owner.FindSession (id);
if (!session)
{
SendMessageReply (SAM_STREAM_STATUS_INVALID_ID, strlen(SAM_STREAM_STATUS_INVALID_ID), true);
return;
}
if (session->GetLocalDestination ()->IsAcceptingStreams ())
{
SendSessionI2PError ("Already accepting");
return;
}
auto it = params.find (SAM_PARAM_PORT);
if (it == params.end ())
{
SendSessionI2PError ("PORT is missing");
return;
}
auto port = std::stoi (it->second);
if (port <= 0 || port >= 0xFFFF)
{
SendSessionI2PError ("Invalid PORT");
return;
}
boost::system::error_code ec;
auto ep = m_Socket.remote_endpoint (ec);
if (ec)
{
SendSessionI2PError ("Socket error");
return;
}
ep.port (port);
m_SocketType = eSAMSocketTypeForward;
m_ID = id;
m_IsAccepting = true;
std::string& silent = params[SAM_PARAM_SILENT];
if (silent == SAM_VALUE_TRUE) m_IsSilent = true;
session->GetLocalDestination ()->AcceptStreams (std::bind (&SAMSocket::HandleI2PForward,
shared_from_this (), std::placeholders::_1, ep));
SendMessageReply (SAM_STREAM_STATUS_OK, strlen(SAM_STREAM_STATUS_OK), false);
}
size_t SAMSocket::ProcessDatagramSend (char * buf, size_t len, const char * data)
{
LogPrint (eLogDebug, "SAM: Datagram send: ", buf, " ", len);
std::map<std::string, std::string> params;
ExtractParams (buf, params);
size_t size = std::stoi(params[SAM_PARAM_SIZE]), offset = data - buf;
if (offset + size <= len)
{
auto session = m_Owner.FindSession(m_ID);
if (session)
{
auto d = session->GetLocalDestination ()->GetDatagramDestination ();
if (d)
{
i2p::data::IdentityEx dest;
dest.FromBase64 (params[SAM_PARAM_DESTINATION]);
if (session->Type == eSAMSessionTypeDatagram)
d->SendDatagramTo ((const uint8_t *)data, size, dest.GetIdentHash ());
else // raw
d->SendRawDatagramTo ((const uint8_t *)data, size, dest.GetIdentHash ());
}
else
LogPrint (eLogError, "SAM: Missing datagram destination");
}
else
LogPrint (eLogError, "SAM: Session is not created from DATAGRAM SEND");
}
else
{
LogPrint (eLogWarning, "SAM: Sent datagram size ", size, " exceeds buffer ", len - offset);
return 0; // try to receive more
}
return offset + size;
}
void SAMSocket::ProcessDestGenerate (char * buf, size_t len)
{
LogPrint (eLogDebug, "SAM: Dest generate");
std::map<std::string, std::string> params;
ExtractParams (buf, params);
// extract signature type
i2p::data::SigningKeyType signatureType = i2p::data::SIGNING_KEY_TYPE_DSA_SHA1;
i2p::data::CryptoKeyType cryptoType = i2p::data::CRYPTO_KEY_TYPE_ELGAMAL;
auto it = params.find (SAM_PARAM_SIGNATURE_TYPE);
if (it != params.end ())
{
if (!m_Owner.ResolveSignatureType (it->second, signatureType))
LogPrint (eLogWarning, "SAM: ", SAM_PARAM_SIGNATURE_TYPE, " is invalid ", it->second);
}
it = params.find (SAM_PARAM_CRYPTO_TYPE);
if (it != params.end ())
{
try
{
cryptoType = std::stoi(it->second);
}
catch (const std::exception& ex)
{
LogPrint (eLogWarning, "SAM: ", SAM_PARAM_CRYPTO_TYPE, "error: ", ex.what ());
}
}
auto keys = i2p::data::PrivateKeys::CreateRandomKeys (signatureType, cryptoType, true);
#ifdef _MSC_VER
size_t l = sprintf_s (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_DEST_REPLY,
keys.GetPublic ()->ToBase64 ().c_str (), keys.ToBase64 ().c_str ());
#else
size_t l = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_DEST_REPLY,
keys.GetPublic ()->ToBase64 ().c_str (), keys.ToBase64 ().c_str ());
#endif
SendMessageReply (m_Buffer, l, false);
}
void SAMSocket::ProcessNamingLookup (char * buf, size_t len)
{
LogPrint (eLogDebug, "SAM: Naming lookup: ", buf);
std::map<std::string, std::string> params;
ExtractParams (buf, params);
std::string& name = params[SAM_PARAM_NAME];
std::shared_ptr<const i2p::data::IdentityEx> identity;
std::shared_ptr<const Address> addr;
auto session = m_Owner.FindSession(m_ID);
auto dest = session == nullptr ? context.GetSharedLocalDestination() : session->GetLocalDestination ();
if (name == "ME")
SendNamingLookupReply (name, dest->GetIdentity ());
else if ((identity = context.GetAddressBook ().GetFullAddress (name)) != nullptr)
SendNamingLookupReply (name, identity);
else if ((addr = context.GetAddressBook ().GetAddress (name)))
{
if (addr->IsIdentHash ())
{
auto leaseSet = dest->FindLeaseSet (addr->identHash);
if (leaseSet)
SendNamingLookupReply (name, leaseSet->GetIdentity ());
else
dest->RequestDestination (addr->identHash,
std::bind (&SAMSocket::HandleNamingLookupLeaseSetRequestComplete,
shared_from_this (), std::placeholders::_1, name));
}
else
dest->RequestDestinationWithEncryptedLeaseSet (addr->blindedPublicKey,
std::bind (&SAMSocket::HandleNamingLookupLeaseSetRequestComplete,
shared_from_this (), std::placeholders::_1, name));
}
else
{
LogPrint (eLogError, "SAM: Naming failed, unknown address ", name);
#ifdef _MSC_VER
size_t len = sprintf_s (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_NAMING_REPLY_INVALID_KEY, name.c_str());
#else
size_t len = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_NAMING_REPLY_INVALID_KEY, name.c_str());
#endif
SendMessageReply (m_Buffer, len, false);
}
}
void SAMSocket::ProcessSessionAdd (char * buf, size_t len)
{
auto session = m_Owner.FindSession(m_ID);
if (session && session->Type == eSAMSessionTypeMaster)
{
LogPrint (eLogDebug, "SAM: Subsession add: ", buf);
auto masterSession = std::static_pointer_cast<SAMMasterSession>(session);
std::map<std::string, std::string> params;
ExtractParams (buf, params);
std::string& id = params[SAM_PARAM_ID];
if (masterSession->subsessions.count (id) > 1)
{
// session exists
SendMessageReply (SAM_SESSION_CREATE_DUPLICATED_ID, strlen(SAM_SESSION_CREATE_DUPLICATED_ID), false);
return;
}
std::string& style = params[SAM_PARAM_STYLE];
SAMSessionType type = eSAMSessionTypeUnknown;
if (style == SAM_VALUE_STREAM) type = eSAMSessionTypeStream;
// TODO: implement other styles
if (type == eSAMSessionTypeUnknown)
{
// unknown style
SendSessionI2PError("Unsupported STYLE");
return;
}
auto fromPort = std::stoi(params[SAM_PARAM_FROM_PORT]);
if (fromPort == -1)
{
SendSessionI2PError("Invalid from port");
return;
}
auto subsession = std::make_shared<SAMSubSession>(masterSession, id, type, fromPort);
if (m_Owner.AddSession (subsession))
{
masterSession->subsessions.insert (id);
SendSessionCreateReplyOk ();
}
else
SendMessageReply (SAM_SESSION_CREATE_DUPLICATED_ID, strlen(SAM_SESSION_CREATE_DUPLICATED_ID), false);
}
else
SendSessionI2PError ("Wrong session type");
}
void SAMSocket::ProcessSessionRemove (char * buf, size_t len)
{
auto session = m_Owner.FindSession(m_ID);
if (session && session->Type == eSAMSessionTypeMaster)
{
LogPrint (eLogDebug, "SAM: Subsession remove: ", buf);
auto masterSession = std::static_pointer_cast<SAMMasterSession>(session);
std::map<std::string, std::string> params;
ExtractParams (buf, params);
std::string& id = params[SAM_PARAM_ID];
if (!masterSession->subsessions.erase (id))
{
SendMessageReply (SAM_SESSION_STATUS_INVALID_KEY, strlen(SAM_SESSION_STATUS_INVALID_KEY), false);
return;
}
m_Owner.CloseSession (id);
SendSessionCreateReplyOk ();
}
else
SendSessionI2PError ("Wrong session type");
}
void SAMSocket::SendSessionI2PError(const std::string & msg)
{
LogPrint (eLogError, "SAM: Session I2P error: ", msg);
#ifdef _MSC_VER
size_t len = sprintf_s (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_SESSION_STATUS_I2P_ERROR, msg.c_str());
#else
size_t len = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_SESSION_STATUS_I2P_ERROR, msg.c_str());
#endif
SendMessageReply (m_Buffer, len, true);
}
void SAMSocket::SendStreamI2PError(const std::string & msg)
{
LogPrint (eLogError, "SAM: Stream I2P error: ", msg);
#ifdef _MSC_VER
size_t len = sprintf_s (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_STREAM_STATUS_I2P_ERROR, msg.c_str());
#else
size_t len = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_STREAM_STATUS_I2P_ERROR, msg.c_str());
#endif
SendMessageReply (m_Buffer, len, true);
}
void SAMSocket::HandleNamingLookupLeaseSetRequestComplete (std::shared_ptr<i2p::data::LeaseSet> leaseSet, std::string name)
{
if (leaseSet)
{
context.GetAddressBook ().InsertFullAddress (leaseSet->GetIdentity ());
SendNamingLookupReply (name, leaseSet->GetIdentity ());
}
else
{
LogPrint (eLogError, "SAM: Naming lookup failed. LeaseSet for ", name, " not found");
#ifdef _MSC_VER
size_t len = sprintf_s (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_NAMING_REPLY_INVALID_KEY, name.c_str());
#else
size_t len = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_NAMING_REPLY_INVALID_KEY, name.c_str());
#endif
SendMessageReply (m_Buffer, len, false);
}
}
void SAMSocket::SendNamingLookupReply (const std::string& name, std::shared_ptr<const i2p::data::IdentityEx> identity)
{
auto base64 = identity->ToBase64 ();
#ifdef _MSC_VER
size_t l = sprintf_s (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_NAMING_REPLY, name.c_str (), base64.c_str ());
#else
size_t l = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_NAMING_REPLY, name.c_str (), base64.c_str ());
#endif
SendMessageReply (m_Buffer, l, false);
}
void SAMSocket::ExtractParams (char * buf, std::map<std::string, std::string>& params)
{
char * separator;
do
{
separator = strchr (buf, ' ');
if (separator) *separator = 0;
char * value = strchr (buf, '=');
if (value)
{
*value = 0;
value++;
params[buf] = value;
}
buf = separator + 1;
}
while (separator);
}
void SAMSocket::Receive ()
{
m_Socket.async_read_some (boost::asio::buffer(m_Buffer + m_BufferOffset, SAM_SOCKET_BUFFER_SIZE - m_BufferOffset),
std::bind((m_SocketType == eSAMSocketTypeStream) ? &SAMSocket::HandleReceived : &SAMSocket::HandleMessage,
shared_from_this (), std::placeholders::_1, std::placeholders::_2));
}
void SAMSocket::HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
LogPrint (eLogError, "SAM: Read error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ("read error");
}
else
{
if (m_Stream)
{
bytes_transferred += m_BufferOffset;
m_BufferOffset = 0;
m_Stream->AsyncSend ((uint8_t *)m_Buffer, bytes_transferred,
std::bind(&SAMSocket::HandleStreamSend, shared_from_this(), std::placeholders::_1));
}
else
{
Terminate("No Stream Remaining");
}
}
}
void SAMSocket::I2PReceive ()
{
if (m_Stream)
{
if (m_Stream->GetStatus () == i2p::stream::eStreamStatusNew ||
m_Stream->GetStatus () == i2p::stream::eStreamStatusOpen) // regular
{
m_Stream->AsyncReceive (boost::asio::buffer (m_StreamBuffer, SAM_SOCKET_BUFFER_SIZE),
std::bind (&SAMSocket::HandleI2PReceive, shared_from_this(),
std::placeholders::_1, std::placeholders::_2),
SAM_SOCKET_CONNECTION_MAX_IDLE);
}
else // closed by peer
{
uint8_t * buff = new uint8_t[SAM_SOCKET_BUFFER_SIZE];
// get remaining data
auto len = m_Stream->ReadSome (buff, SAM_SOCKET_BUFFER_SIZE);
if (len > 0) // still some data
{
WriteI2PDataImmediate(buff, len);
}
else // no more data
{
delete [] buff;
Terminate ("no more data");
}
}
}
}
void SAMSocket::WriteI2PDataImmediate(uint8_t * buff, size_t sz)
{
boost::asio::async_write (
m_Socket,
boost::asio::buffer (buff, sz),
boost::asio::transfer_all(),
std::bind (&SAMSocket::HandleWriteI2PDataImmediate, shared_from_this (), std::placeholders::_1, buff)); // postpone termination
}
void SAMSocket::HandleWriteI2PDataImmediate(const boost::system::error_code & ec, uint8_t * buff)
{
delete [] buff;
}
void SAMSocket::WriteI2PData(size_t sz)
{
boost::asio::async_write (
m_Socket,
boost::asio::buffer (m_StreamBuffer, sz),
boost::asio::transfer_all(),
std::bind(&SAMSocket::HandleWriteI2PData, shared_from_this(), std::placeholders::_1, std::placeholders::_2));
}
void SAMSocket::HandleI2PReceive (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{