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handle ipv6 adrresses

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orignal 2014-10-29 12:28:44 -04:00
parent d84a7ebc7e
commit d513f20225
2 changed files with 97 additions and 32 deletions
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127
SSU.cpp
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@ -237,7 +237,7 @@ namespace transport
if (!s.Verify (m_RemoteIdentity, payload))
LogPrint (eLogError, "SSU signature verification failed");
SendSessionConfirmed (y, ourAddress);
SendSessionConfirmed (y, ourAddress, addressSize + 2);
}
void SSUSession::ProcessSessionConfirmed (uint8_t * buf, size_t len)
@ -269,17 +269,26 @@ namespace transport
return;
}
uint8_t buf[304 + 18]; // 304 bytes for ipv4 (320 for ipv6)
uint8_t buf[320 + 18]; // 304 bytes for ipv4, 320 for ipv6
uint8_t * payload = buf + sizeof (SSUHeader);
memcpy (payload, m_DHKeysPair->publicKey, 256); // x
payload[256] = 4; // we assume ipv4
*(uint32_t *)(payload + 257) = htobe32 (m_RemoteEndpoint.address ().to_v4 ().to_ulong ());
bool isV4 = m_RemoteEndpoint.address ().is_v4 ();
if (isV4)
{
payload[256] = 4;
memcpy (payload + 257, m_RemoteEndpoint.address ().to_v4 ().to_bytes ().data(), 4);
}
else
{
payload[256] = 16;
memcpy (payload + 257, m_RemoteEndpoint.address ().to_v6 ().to_bytes ().data(), 16);
}
uint8_t iv[16];
CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator ();
rnd.GenerateBlock (iv, 16); // random iv
FillHeaderAndEncrypt (PAYLOAD_TYPE_SESSION_REQUEST, buf, 304, introKey, iv, introKey);
m_Server.Send (buf, 304, m_RemoteEndpoint);
FillHeaderAndEncrypt (PAYLOAD_TYPE_SESSION_REQUEST, buf, isV4 ? 304 : 320, introKey, iv, introKey);
m_Server.Send (buf, isV4 ? 304 : 320, m_RemoteEndpoint);
}
void SSUSession::SendRelayRequest (uint32_t iTag, const uint8_t * iKey)
@ -333,14 +342,31 @@ namespace transport
memcpy (payload, m_DHKeysPair->publicKey, 256);
s.Insert (payload, 256); // y
payload += 256;
*payload = 4; // we assume ipv4
payload++;
*(uint32_t *)(payload) = htobe32 (m_RemoteEndpoint.address ().to_v4 ().to_ulong ());
payload += 4;
if (m_RemoteEndpoint.address ().is_v4 ())
{
// ipv4
*payload = 4;
payload++;
memcpy (payload, m_RemoteEndpoint.address ().to_v4 ().to_bytes ().data(), 4);
s.Insert (payload, 4); // remote endpoint IP V4
payload += 4;
}
else
{
// ipv6
*payload = 16;
payload++;
memcpy (payload, m_RemoteEndpoint.address ().to_v6 ().to_bytes ().data(), 16);
s.Insert (payload, 16); // remote endpoint IP V6
payload += 16;
}
*(uint16_t *)(payload) = htobe16 (m_RemoteEndpoint.port ());
s.Insert (payload, 2); // remote port
payload += 2;
s.Insert (payload - 6, 6); // remote endpoint IP and port
s.Insert (htobe32 (address->host.to_v4 ().to_ulong ())); // our IP
if (address->host.is_v4 ())
s.Insert (address->host.to_v4 ().to_bytes ().data (), 4); // our IP V4
else
s.Insert (address->host.to_v6 ().to_bytes ().data (), 16); // our IP V6
s.Insert (htobe16 (address->port)); // our port
uint32_t relayTag = 0;
if (i2p::context.GetRouterInfo ().IsIntroducer ())
@ -373,7 +399,7 @@ namespace transport
Send (buf, msgLen);
}
void SSUSession::SendSessionConfirmed (const uint8_t * y, const uint8_t * ourAddress)
void SSUSession::SendSessionConfirmed (const uint8_t * y, const uint8_t * ourAddress, size_t ourAddressLen)
{
uint8_t buf[512 + 18];
uint8_t * payload = buf + sizeof (SSUHeader);
@ -397,8 +423,11 @@ namespace transport
SignedData s; // x,y, our IP, our port, remote IP, remote port, relayTag, our signed on time
s.Insert (m_DHKeysPair->publicKey, 256); // x
s.Insert (y, 256); // y
s.Insert (ourAddress, 6); // our address/port as seem by party
s.Insert (htobe32 (m_RemoteEndpoint.address ().to_v4 ().to_ulong ())); // remote IP
s.Insert (ourAddress, ourAddressLen); // our address/port as seem by party
if (m_RemoteEndpoint.address ().is_v4 ())
s.Insert (m_RemoteEndpoint.address ().to_v4 ().to_bytes ().data (), 4); // remote IP V4
else
s.Insert (m_RemoteEndpoint.address ().to_v6 ().to_bytes ().data (), 16); // remote IP V6
s.Insert (htobe16 (m_RemoteEndpoint.port ())); // remote port
s.Insert (htobe32 (m_RelayTag)); // relay tag
s.Insert (htobe32 (signedOnTime)); // signed on time
@ -439,9 +468,14 @@ namespace transport
void SSUSession::SendRelayResponse (uint32_t nonce, const boost::asio::ip::udp::endpoint& from,
const uint8_t * introKey, const boost::asio::ip::udp::endpoint& to)
{
uint8_t buf[64 + 18];
uint8_t buf[80 + 18]; // 64 Alice's ipv4 and 80 Alice's ipv6
uint8_t * payload = buf + sizeof (SSUHeader);
// Charlie
// Charlie's address always v4
if (!to.address ().is_v4 ())
{
LogPrint (eLogError, "Charlie's IP must be v4");
return;
}
*payload = 4;
payload++; // size
*(uint32_t *)payload = htobe32 (to.address ().to_v4 ().to_ulong ()); // Charlie's IP
@ -449,10 +483,21 @@ namespace transport
*(uint16_t *)payload = htobe16 (to.port ()); // Charlie's port
payload += 2; // port
// Alice
*payload = 4;
payload++; // size
*(uint32_t *)payload = htobe32 (from.address ().to_v4 ().to_ulong ()); // Alice's IP
payload += 4; // address
bool isV4 = from.address ().is_v4 (); // Alice's
if (isV4)
{
*payload = 4;
payload++; // size
memcpy (payload, from.address ().to_v4 ().to_bytes ().data (), 4); // Alice's IP V4
payload += 4; // address
}
else
{
*payload = 16;
payload++; // size
memcpy (payload, from.address ().to_v6 ().to_bytes ().data (), 16); // Alice's IP V6
payload += 16; // address
}
*(uint16_t *)payload = htobe16 (from.port ()); // Alice's port
payload += 2; // port
*(uint32_t *)payload = htobe32 (nonce);
@ -460,8 +505,8 @@ namespace transport
if (m_State == eSessionStateEstablished)
{
// encrypt with session key
FillHeaderAndEncrypt (PAYLOAD_TYPE_RELAY_RESPONSE, buf, 64);
Send (buf, 64);
FillHeaderAndEncrypt (PAYLOAD_TYPE_RELAY_RESPONSE, buf, isV4 ? 64 : 80);
Send (buf, isV4 ? 64 : 80);
}
else
{
@ -469,8 +514,8 @@ namespace transport
uint8_t iv[16];
CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator ();
rnd.GenerateBlock (iv, 16); // random iv
FillHeaderAndEncrypt (PAYLOAD_TYPE_RELAY_RESPONSE, buf, 64, introKey, iv, introKey);
m_Server.Send (buf, 64, from);
FillHeaderAndEncrypt (PAYLOAD_TYPE_RELAY_RESPONSE, buf, isV4 ? 64 : 80, introKey, iv, introKey);
m_Server.Send (buf, isV4 ? 64 : 80, from);
}
LogPrint (eLogDebug, "SSU relay response sent");
}
@ -478,6 +523,12 @@ namespace transport
void SSUSession::SendRelayIntro (SSUSession * session, const boost::asio::ip::udp::endpoint& from)
{
if (!session) return;
// Alice's address always v4
if (!from.address ().is_v4 ())
{
LogPrint (eLogError, "Alice's IP must be v4");
return;
}
uint8_t buf[48 + 18];
uint8_t * payload = buf + sizeof (SSUHeader);
*payload = 4;
@ -499,14 +550,28 @@ namespace transport
{
LogPrint (eLogDebug, "Relay response received");
uint8_t * payload = buf + sizeof (SSUHeader);
uint8_t remoteSize = *payload;
payload++; // remote size
//boost::asio::ip::address_v4 remoteIP (be32toh (*(uint32_t* )(payload)));
payload += 4; // remote address
payload += remoteSize; // remote address
//uint16_t remotePort = be16toh (*(uint16_t *)(payload));
payload += 2; // remote port
uint8_t ourSize = *payload;
payload++; // our size
boost::asio::ip::address_v4 ourIP (be32toh (*(uint32_t* )(payload)));
payload += 4; // our address
boost::asio::ip::address ourIP;
if (ourSize == 4)
{
boost::asio::ip::address_v4::bytes_type bytes;
memcpy (bytes.data (), payload, 4);
ourIP = boost::asio::ip::address_v4 (bytes);
}
else
{
boost::asio::ip::address_v6::bytes_type bytes;
memcpy (bytes.data (), payload, 16);
ourIP = boost::asio::ip::address_v6 (bytes);
}
payload += ourSize; // our address
uint16_t ourPort = be16toh (*(uint16_t *)(payload));
payload += 2; // our port
LogPrint ("Our external address is ", ourIP.to_string (), ":", ourPort);
@ -924,9 +989,9 @@ namespace transport
void SSUSession::Send (uint8_t type, const uint8_t * payload, size_t len)
{
uint8_t buf[SSU_MTU + 18];
uint8_t buf[SSU_MTU_V4 + 18];
size_t msgSize = len + sizeof (SSUHeader);
if (msgSize > SSU_MTU)
if (msgSize > SSU_MTU_V4)
{
LogPrint (eLogWarning, "SSU payload size ", msgSize, " exceeds MTU");
return;
@ -1016,7 +1081,7 @@ namespace transport
void SSUServer::Receive ()
{
m_Socket.async_receive_from (boost::asio::buffer (m_ReceiveBuffer, SSU_MTU), m_SenderEndpoint,
m_Socket.async_receive_from (boost::asio::buffer (m_ReceiveBuffer, SSU_MTU_V4), m_SenderEndpoint,
boost::bind (&SSUServer::HandleReceivedFrom, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
}

2
SSU.h
View File

@ -96,7 +96,7 @@ namespace transport
void ProcessSessionCreated (uint8_t * buf, size_t len);
void SendSessionCreated (const uint8_t * x);
void ProcessSessionConfirmed (uint8_t * buf, size_t len);
void SendSessionConfirmed (const uint8_t * y, const uint8_t * ourAddress);
void SendSessionConfirmed (const uint8_t * y, const uint8_t * ourAddress, size_t ourAddressLen);
void ProcessRelayRequest (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& from);
void SendRelayResponse (uint32_t nonce, const boost::asio::ip::udp::endpoint& from,
const uint8_t * introKey, const boost::asio::ip::udp::endpoint& to);