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i2pd/libi2pd_client/SAM.cpp

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#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:
{
if (Session)
{
if (m_IsAccepting && Session->localDestination)
Session->localDestination->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)
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)
{
*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_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_DATAGRAM_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;
}
std::shared_ptr<boost::asio::ip::udp::endpoint> forward = nullptr;
if (style == SAM_VALUE_DATAGRAM && params.find(SAM_VALUE_HOST) != params.end() && params.find(SAM_VALUE_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_VALUE_HOST], e);
if (e)
{
// not an ip address
SendI2PError("Invalid IP Address in HOST");
return;
}
auto port = std::stoi(params[SAM_VALUE_PORT]);
if (port == -1)
{
SendI2PError("Invalid port");
return;
}
forward = std::make_shared<boost::asio::ip::udp::endpoint>(addr, port);
}
// create destination
auto session = m_Owner.CreateSession (id, destination == SAM_VALUE_TRANSIENT ? "" : destination, &params);
if (session)
{
m_SocketType = eSAMSocketTypeSession;
if (style == SAM_VALUE_DATAGRAM)
{
session->UDPEndpoint = forward;
auto dest = session->localDestination->CreateDatagramDestination ();
dest->SetReceiver (std::bind (&SAMSocket::HandleI2PDatagramReceive, shared_from_this (),
std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4, std::placeholders::_5));
}
if (session->localDestination->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)
{
auto session = m_Owner.FindSession(m_ID);
if(session)
{
if (session->localDestination->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));
}
}
}
}
void SAMSocket::SendSessionCreateReplyOk ()
{
auto session = m_Owner.FindSession(m_ID);
if (session)
{
uint8_t buf[1024];
char priv[1024];
size_t l = session->localDestination->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);
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;
auto dest = std::make_shared<i2p::data::IdentityEx> ();
size_t l = dest->FromBase64(destination);
if (l > 0)
{
context.GetAddressBook().InsertAddress(dest);
auto leaseSet = session->localDestination->FindLeaseSet(dest->GetIdentHash());
if (leaseSet)
Connect(leaseSet);
else
{
session->localDestination->RequestDestination(dest->GetIdentHash(),
std::bind(&SAMSocket::HandleConnectLeaseSetRequestComplete,
shared_from_this(), std::placeholders::_1));
}
}
else
SendMessageReply(SAM_SESSION_STATUS_INVALID_KEY, strlen(SAM_SESSION_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)
{
auto session = m_Owner.FindSession(m_ID);
if(session)
{
m_SocketType = eSAMSocketTypeStream;
m_Stream = session->localDestination->CreateStream (remote);
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);
}
}
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);
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->localDestination->IsAcceptingStreams ())
{
m_IsAccepting = true;
session->localDestination->AcceptOnce (std::bind (&SAMSocket::HandleI2PAccept, shared_from_this (), std::placeholders::_1));
}
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);
}
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->localDestination->GetDatagramDestination ();
if (d)
{
i2p::data::IdentityEx dest;
dest.FromBase64 (params[SAM_PARAM_DESTINATION]);
d->SendDatagramTo ((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 ())
// TODO: extract string values
signatureType = std::stoi(it->second);
it = params.find (SAM_PARAM_CRYPTO_TYPE);
if (it != params.end ())
cryptoType = std::stoi(it->second);
auto keys = i2p::data::PrivateKeys::CreateRandomKeys (signatureType, cryptoType);
#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;
i2p::data::IdentHash ident;
auto session = m_Owner.FindSession(m_ID);
auto dest = session == nullptr ? context.GetSharedLocalDestination() : session->localDestination;
if (name == "ME")
SendNamingLookupReply (dest->GetIdentity ());
else if ((identity = context.GetAddressBook ().GetAddress (name)) != nullptr)
SendNamingLookupReply (identity);
else if (context.GetAddressBook ().GetIdentHash (name, ident))
{
auto leaseSet = dest->FindLeaseSet (ident);
if (leaseSet)
SendNamingLookupReply (leaseSet->GetIdentity ());
else
dest->RequestDestination (ident,
std::bind (&SAMSocket::HandleNamingLookupLeaseSetRequestComplete,
shared_from_this (), std::placeholders::_1, ident));
}
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::SendI2PError(const std::string & msg)
{
LogPrint (eLogError, "SAM: 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::HandleNamingLookupLeaseSetRequestComplete (std::shared_ptr<i2p::data::LeaseSet> leaseSet, i2p::data::IdentHash ident)
{
if (leaseSet)
{
context.GetAddressBook ().InsertAddress (leaseSet->GetIdentity ());
SendNamingLookupReply (leaseSet->GetIdentity ());
}
else
{
LogPrint (eLogError, "SAM: naming lookup failed. LeaseSet for ", ident.ToBase32 (), " not found");
#ifdef _MSC_VER
size_t len = sprintf_s (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_NAMING_REPLY_INVALID_KEY,
context.GetAddressBook ().ToAddress (ident).c_str());
#else
size_t len = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_NAMING_REPLY_INVALID_KEY,
context.GetAddressBook ().ToAddress (ident).c_str());
#endif
SendMessageReply (m_Buffer, len, false);
}
}
void SAMSocket::SendNamingLookupReply (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, base64.c_str ());
#else
size_t l = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_NAMING_REPLY, 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 remaning 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)
{
if (ecode)
{
LogPrint (eLogError, "SAM: stream read error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
{
if (bytes_transferred > 0)
{
WriteI2PData(bytes_transferred);
}
else
{
auto s = shared_from_this ();
m_Owner.GetService ().post ([s] { s->Terminate ("stream read error"); });
}
}
else
{
auto s = shared_from_this ();
m_Owner.GetService ().post ([s] { s->Terminate ("stream read error (op aborted)"); });
}
}
else
{
if (m_SocketType != eSAMSocketTypeTerminated)
{
if (bytes_transferred > 0)
{
WriteI2PData(bytes_transferred);
}
else
I2PReceive();
}
}
}
void SAMSocket::HandleWriteI2PData (const boost::system::error_code& ecode, size_t bytes_transferred)
{
if (ecode)
{
LogPrint (eLogError, "SAM: socket write error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ("socket write error at HandleWriteI2PData");
}
else
{
I2PReceive ();
}
}
void SAMSocket::HandleI2PAccept (std::shared_ptr<i2p::stream::Stream> stream)
{
if (stream)
{
LogPrint (eLogDebug, "SAM: incoming I2P connection for session ", m_ID);
m_SocketType = eSAMSocketTypeStream;
m_IsAccepting = false;
m_Stream = stream;
context.GetAddressBook ().InsertAddress (stream->GetRemoteIdentity ());
auto session = m_Owner.FindSession (m_ID);
if (session)
{
// find more pending acceptors
for (auto & it: m_Owner.ListSockets (m_ID))
if (it->m_SocketType == eSAMSocketTypeAcceptor)
{
it->m_IsAccepting = true;
session->localDestination->AcceptOnce (std::bind (&SAMSocket::HandleI2PAccept, it, std::placeholders::_1));
break;
}
}
if (!m_IsSilent)
{
// get remote peer address
auto ident_ptr = stream->GetRemoteIdentity();
const size_t ident_len = ident_ptr->GetFullLen();
uint8_t* ident = new uint8_t[ident_len];
// send remote peer address as base64
const size_t l = ident_ptr->ToBuffer (ident, ident_len);
const size_t l1 = i2p::data::ByteStreamToBase64 (ident, l, (char *)m_StreamBuffer, SAM_SOCKET_BUFFER_SIZE);
delete[] ident;
m_StreamBuffer[l1] = '\n';
HandleI2PReceive (boost::system::error_code (), l1 +1); // we send identity like it has been received from stream
}
else
I2PReceive ();
}
else
LogPrint (eLogWarning, "SAM: I2P acceptor has been reset");
}
void SAMSocket::HandleI2PDatagramReceive (const i2p::data::IdentityEx& from, uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len)
{
LogPrint (eLogDebug, "SAM: datagram received ", len);
auto base64 = from.ToBase64 ();
auto session = m_Owner.FindSession(m_ID);
if(session)
{
auto ep = session->UDPEndpoint;
if (ep)
{
// udp forward enabled
size_t bsz = base64.size();
size_t sz = bsz + 1 + len;
// build datagram body
uint8_t * data = new uint8_t[sz];
// Destination
memcpy(data, base64.c_str(), bsz);
// linefeed
data[bsz] = '\n';
// Payload
memcpy(data+bsz+1, buf, len);
// send to remote endpoint
m_Owner.SendTo(data, sz, ep);
delete [] data;
}
else
{
#ifdef _MSC_VER
size_t l = sprintf_s ((char *)m_StreamBuffer, SAM_SOCKET_BUFFER_SIZE, SAM_DATAGRAM_RECEIVED, base64.c_str (), (long unsigned int)len);
#else
size_t l = snprintf ((char *)m_StreamBuffer, SAM_SOCKET_BUFFER_SIZE, SAM_DATAGRAM_RECEIVED, base64.c_str (), (long unsigned int)len);
#endif
if (len < SAM_SOCKET_BUFFER_SIZE - l)
{
memcpy (m_StreamBuffer + l, buf, len);
WriteI2PData(len + l);
}
else
LogPrint (eLogWarning, "SAM: received datagram size ", len," exceeds buffer");
}
}
}
void SAMSocket::HandleStreamSend(const boost::system::error_code & ec)
{
m_Owner.GetService ().post (std::bind( !ec ? &SAMSocket::Receive : &SAMSocket::TerminateClose, shared_from_this()));
}
SAMSession::SAMSession (SAMBridge & parent, const std::string & id, std::shared_ptr<ClientDestination> dest):
m_Bridge(parent),
localDestination (dest),
UDPEndpoint(nullptr),
Name(id)
{
}
SAMSession::~SAMSession ()
{
i2p::client::context.DeleteLocalDestination (localDestination);
}
void SAMSession::CloseStreams ()
{
for(const auto & itr : m_Bridge.ListSockets(Name))
{
itr->Terminate(nullptr);
}
}
SAMBridge::SAMBridge (const std::string& address, int port):
m_IsRunning (false), m_Thread (nullptr),
m_Acceptor (m_Service, boost::asio::ip::tcp::endpoint(boost::asio::ip::address::from_string(address), port)),
m_DatagramEndpoint (boost::asio::ip::address::from_string(address), port-1), m_DatagramSocket (m_Service, m_DatagramEndpoint)
{
}
SAMBridge::~SAMBridge ()
{
if (m_IsRunning)
Stop ();
}
void SAMBridge::Start ()
{
Accept ();
ReceiveDatagram ();
m_IsRunning = true;
m_Thread = new std::thread (std::bind (&SAMBridge::Run, this));
}
void SAMBridge::Stop ()
{
m_IsRunning = false;
m_Acceptor.cancel ();
for (auto& it: m_Sessions)
it.second->CloseStreams ();
m_Sessions.clear ();
m_Service.stop ();
if (m_Thread)
{
m_Thread->join ();
delete m_Thread;
m_Thread = nullptr;
}
}
void SAMBridge::Run ()
{
while (m_IsRunning)
{
try
{
m_Service.run ();
}
catch (std::exception& ex)
{
LogPrint (eLogError, "SAM: runtime exception: ", ex.what ());
}
}
}
void SAMBridge::Accept ()
{
auto newSocket = std::make_shared<SAMSocket>(*this);
m_Acceptor.async_accept (newSocket->GetSocket(), std::bind (&SAMBridge::HandleAccept, this,
std::placeholders::_1, newSocket));
}
void SAMBridge::RemoveSocket(const std::shared_ptr<SAMSocket> & socket)
{
std::unique_lock<std::mutex> lock(m_OpenSocketsMutex);
m_OpenSockets.remove_if([socket](const std::shared_ptr<SAMSocket> & item) -> bool { return item == socket; });
}
void SAMBridge::HandleAccept(const boost::system::error_code& ecode, std::shared_ptr<SAMSocket> socket)
{
if (!ecode)
{
boost::system::error_code ec;
auto ep = socket->GetSocket ().remote_endpoint (ec);
if (!ec)
{
LogPrint (eLogDebug, "SAM: new connection from ", ep);
{
std::unique_lock<std::mutex> l(m_OpenSocketsMutex);
m_OpenSockets.push_back(socket);
}
socket->ReceiveHandshake ();
}
else
LogPrint (eLogError, "SAM: incoming connection error ", ec.message ());
}
else
LogPrint (eLogError, "SAM: accept error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Accept ();
}
std::shared_ptr<SAMSession> SAMBridge::CreateSession (const std::string& id, const std::string& destination,
const std::map<std::string, std::string> * params)
{
std::shared_ptr<ClientDestination> localDestination = nullptr;
if (destination != "")
{
i2p::data::PrivateKeys keys;
if (!keys.FromBase64 (destination)) return nullptr;
localDestination = i2p::client::context.CreateNewLocalDestination (keys, true, params);
}
else // transient
{
// extract signature type
i2p::data::SigningKeyType signatureType = i2p::data::SIGNING_KEY_TYPE_DSA_SHA1;
i2p::data::CryptoKeyType cryptoType = i2p::data::CRYPTO_KEY_TYPE_ELGAMAL;
if (params)
{
auto it = params->find (SAM_PARAM_SIGNATURE_TYPE);
if (it != params->end ())
{
// TODO: extract string values
try
{
signatureType = std::stoi(it->second);
}
catch (const std::exception& ex)
{
LogPrint (eLogWarning, "SAM: ", SAM_PARAM_SIGNATURE_TYPE, "error: ", ex.what ());
}
}
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 ());
}
}
}
localDestination = i2p::client::context.CreateNewLocalDestination (true, signatureType, cryptoType, params);
}
if (localDestination)
{
localDestination->Acquire ();
auto session = std::make_shared<SAMSession>(*this, id, localDestination);
std::unique_lock<std::mutex> l(m_SessionsMutex);
auto ret = m_Sessions.insert (std::make_pair(id, session));
if (!ret.second)
LogPrint (eLogWarning, "SAM: Session ", id, " already exists");
return ret.first->second;
}
return nullptr;
}
void SAMBridge::CloseSession (const std::string& id)
{
std::shared_ptr<SAMSession> session;
{
std::unique_lock<std::mutex> l(m_SessionsMutex);
auto it = m_Sessions.find (id);
if (it != m_Sessions.end ())
{
session = it->second;
m_Sessions.erase (it);
}
}
if (session)
{
session->localDestination->Release ();
session->localDestination->StopAcceptingStreams ();
session->CloseStreams ();
}
}
std::shared_ptr<SAMSession> SAMBridge::FindSession (const std::string& id) const
{
std::unique_lock<std::mutex> l(m_SessionsMutex);
auto it = m_Sessions.find (id);
if (it != m_Sessions.end ())
return it->second;
return nullptr;
}
std::list<std::shared_ptr<SAMSocket> > SAMBridge::ListSockets(const std::string & id) const
{
std::list<std::shared_ptr<SAMSocket > > list;
{
std::unique_lock<std::mutex> l(m_OpenSocketsMutex);
for (const auto & itr : m_OpenSockets)
if (itr->IsSession(id))
list.push_back(itr);
}
return list;
}
void SAMBridge::SendTo(const uint8_t * buf, size_t len, std::shared_ptr<boost::asio::ip::udp::endpoint> remote)
{
if(remote)
{
m_DatagramSocket.send_to(boost::asio::buffer(buf, len), *remote);
}
}
void SAMBridge::ReceiveDatagram ()
{
m_DatagramSocket.async_receive_from (
boost::asio::buffer (m_DatagramReceiveBuffer, i2p::datagram::MAX_DATAGRAM_SIZE),
m_SenderEndpoint,
std::bind (&SAMBridge::HandleReceivedDatagram, this, std::placeholders::_1, std::placeholders::_2));
}
void SAMBridge::HandleReceivedDatagram (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (!ecode)
{
m_DatagramReceiveBuffer[bytes_transferred] = 0;
char * eol = strchr ((char *)m_DatagramReceiveBuffer, '\n');
if(eol)
{
*eol = 0; eol++;
size_t payloadLen = bytes_transferred - ((uint8_t *)eol - m_DatagramReceiveBuffer);
LogPrint (eLogDebug, "SAM: datagram received ", m_DatagramReceiveBuffer," size=", payloadLen);
char * sessionID = strchr ((char *)m_DatagramReceiveBuffer, ' ');
if (sessionID)
{
sessionID++;
char * destination = strchr (sessionID, ' ');
if (destination)
{
*destination = 0; destination++;
auto session = FindSession (sessionID);
if (session)
{
i2p::data::IdentityEx dest;
dest.FromBase64 (destination);
session->localDestination->GetDatagramDestination ()->
SendDatagramTo ((uint8_t *)eol, payloadLen, dest.GetIdentHash ());
}
else
LogPrint (eLogError, "SAM: Session ", sessionID, " not found");
}
else
LogPrint (eLogError, "SAM: Missing destination key");
}
else
LogPrint (eLogError, "SAM: Missing sessionID");
}
else
LogPrint(eLogError, "SAM: invalid datagram");
ReceiveDatagram ();
}
else
LogPrint (eLogError, "SAM: datagram receive error: ", ecode.message ());
}
}
}
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