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handle UDP packet from proxy relay

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orignal 2022-10-16 22:16:16 -04:00
parent fe25260ee2
commit 39a86ce5c9
2 changed files with 38 additions and 2 deletions
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39
libi2pd/SSU2.cpp
View File

@ -394,7 +394,7 @@ namespace transport
}
return nullptr;
}
void SSU2Server::ProcessNextPacket (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint)
{
if (len < 24) return;
@ -475,7 +475,7 @@ namespace transport
}
}
}
void SSU2Server::Send (const uint8_t * header, size_t headerLen, const uint8_t * payload, size_t payloadLen,
const boost::asio::ip::udp::endpoint& to)
{
@ -1073,5 +1073,40 @@ namespace transport
else
LogPrint (eLogError, "SSU2: Send exception: ", ec.message (), " to ", to);
}
void SSU2Server::ProcessNextPacketFromProxy (uint8_t * buf, size_t len)
{
size_t offset = 0;
boost::asio::ip::udp::endpoint ep;
switch (buf[3]) // ATYP
{
case SOCKS5_ATYP_IPV4:
{
offset = SOCKS5_UDP_IPV4_REQUEST_HEADER_SIZE;
if (offset > len) return;
boost::asio::ip::address_v4::bytes_type bytes;
memcpy (bytes.data (), buf + 4, 4);
uint16_t port = bufbe16toh (buf + 8);
ep = boost::asio::ip::udp::endpoint (boost::asio::ip::address_v4 (bytes), port);
break;
}
case SOCKS5_ATYP_IPV6:
{
offset = SOCKS5_UDP_IPV6_REQUEST_HEADER_SIZE;
if (offset > len) return;
boost::asio::ip::address_v6::bytes_type bytes;
memcpy (bytes.data (), buf + 4, 16);
uint16_t port = bufbe16toh (buf + 20);
ep = boost::asio::ip::udp::endpoint (boost::asio::ip::address_v6 (bytes), port);
break;
}
default:
{
LogPrint (eLogWarning, "SSU2: Unknown ATYP ", (int)buf[3], " from proxy relay");
return;
}
}
ProcessNextPacket (buf + offset, len - offset, ep);
}
}
}

1
libi2pd/SSU2.h
View File

@ -120,6 +120,7 @@ namespace transport
void SendThroughProxy (const uint8_t * header, size_t headerLen, const uint8_t * headerX, size_t headerXLen,
const uint8_t * payload, size_t payloadLen, const boost::asio::ip::udp::endpoint& to);
void ProcessNextPacketFromProxy (uint8_t * buf, size_t len);
private: