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handle DeliveryStatus message

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pull/10/head
orignal 11 years ago
parent 0d9cc12521
commit 869479e566
4 changed files with 83 additions and 40 deletions
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91
Garlic.cpp
Unescape Escape View File

@ -15,9 +15,19 @@ namespace i2p
namespace garlic
{
GarlicRoutingSession::GarlicRoutingSession (const i2p::data::RoutingDestination * destination, int numTags):
m_Destination (destination), m_NumTags (numTags), m_NextTag (-1), m_SessionTags (0)
m_Destination (destination), m_FirstMsgID (0), m_IsAcknowledged (false),
m_NumTags (numTags), m_NextTag (-1), m_SessionTags (0)
{
m_SessionTags = new uint8_t[m_NumTags*32];
// create new session tags and session key
m_Rnd.GenerateBlock (m_SessionKey, 32);
if (m_NumTags > 0)
{
m_SessionTags = new uint8_t[m_NumTags*32];
for (int i = 0; i < m_NumTags; i++)
m_Rnd.GenerateBlock (m_SessionTags + i*32, 32);
}
else
m_SessionTags = nullptr;
}
GarlicRoutingSession::~GarlicRoutingSession ()
@ -27,16 +37,16 @@ namespace garlic
I2NPMessage * GarlicRoutingSession::WrapSingleMessage (I2NPMessage * msg, I2NPMessage * leaseSet)
{
if (GetNumRemainingSessionTags () < 1)
{
LogPrint ("No more session tags");
return nullptr;
}
I2NPMessage * m = NewI2NPMessage ();
size_t len = 0;
uint8_t * buf = m->GetPayload () + 4; // 4 bytes for length
if (m_NextTag < 0 || m_NextTag >= m_NumTags) // new session
if (m_NextTag < 0) // new session
{
// create new session tags and session key
m_Rnd.GenerateBlock (m_SessionKey, 32);
for (int i = 0; i < m_NumTags; i++)
m_Rnd.GenerateBlock (m_SessionTags + i*32, 32);
// create ElGamal block
ElGamalBlock elGamal;
memcpy (elGamal.sessionKey, m_SessionKey, 32);
@ -47,7 +57,7 @@ namespace garlic
buf += 514;
// AES block
m_Encryption.SetKeyWithIV (m_SessionKey, 32, iv);
len += 514 + CreateAESBlock (buf, msg, leaseSet);
len += 514 + CreateAESBlock (buf, msg, leaseSet, true);
}
else // existing session
{
@ -58,7 +68,7 @@ namespace garlic
CryptoPP::SHA256().CalculateDigest(iv, m_SessionTags + m_NextTag*32, 32);
m_Encryption.SetKeyWithIV (m_SessionKey, 32, iv);
// AES block
len += 32 + CreateAESBlock (buf, msg, leaseSet);
len += 32 + CreateAESBlock (buf, msg, leaseSet, false);
}
m_NextTag++;
*(uint32_t *)(m->GetPayload ()) = htobe32 (len);
@ -69,20 +79,23 @@ namespace garlic
return m;
}
size_t GarlicRoutingSession::CreateAESBlock (uint8_t * buf, I2NPMessage * msg, I2NPMessage * leaseSet)
size_t GarlicRoutingSession::CreateAESBlock (uint8_t * buf, I2NPMessage * msg, I2NPMessage * leaseSet, bool isNewSession)
{
size_t blockSize = 0;
*(uint16_t *)buf = htobe16 (m_NumTags); // tag count
*(uint16_t *)buf = isNewSession ? htobe16 (m_NumTags) : 0; // tag count
blockSize += 2;
memcpy (buf + blockSize, m_SessionTags, m_NumTags*32); // tags
blockSize += m_NumTags*32;
if (isNewSession)
{
memcpy (buf + blockSize, m_SessionTags, m_NumTags*32); // tags
blockSize += m_NumTags*32;
}
uint32_t * payloadSize = (uint32_t *)(buf + blockSize);
blockSize += 4;
uint8_t * payloadHash = buf + blockSize;
blockSize += 32;
buf[blockSize] = 0; // flag
blockSize++;
size_t len = CreateGarlicPayload (buf + blockSize, msg, leaseSet);
size_t len = CreateGarlicPayload (buf + blockSize, msg, leaseSet, isNewSession);
*payloadSize = htobe32 (len);
CryptoPP::SHA256().CalculateDigest(payloadHash, buf + blockSize, len);
blockSize += len;
@ -93,21 +106,24 @@ namespace garlic
return blockSize;
}
size_t GarlicRoutingSession::CreateGarlicPayload (uint8_t * payload, I2NPMessage * msg, I2NPMessage * leaseSet)
size_t GarlicRoutingSession::CreateGarlicPayload (uint8_t * payload, I2NPMessage * msg, I2NPMessage * leaseSet, bool isNewSession)
{
uint64_t ts = i2p::util::GetMillisecondsSinceEpoch () + 5000; // 5 sec
uint32_t msgID = m_Rnd.GenerateWord32 ();
uint32_t msgID = m_Rnd.GenerateWord32 ();
size_t size = 0;
uint8_t * numCloves = payload + size;
*numCloves = 0;
size++;
if (leaseSet)
if (isNewSession)
{
// clove is DeliveryStatus is LeaseSet is presented
// clove is DeliveryStatus
size += CreateDeliveryStatusClove (payload + size, msgID);
(*numCloves)++;
m_FirstMsgID = msgID;
}
if (leaseSet)
{
// clove is our leaseSet if presented
size += CreateGarlicClove (payload + size, leaseSet, false);
(*numCloves)++;
@ -212,18 +228,25 @@ namespace garlic
GarlicRoutingSession * session = nullptr;
if (it != m_Sessions.end ())
session = it->second;
if (session && (/*!session->IsAcknowledged () ||*/ session->GetNumRemainingSessionTags () < 1))
{
// we have to create new session
m_Sessions.erase (it);
m_CreatedSessions.erase (session->GetFirstMsgID ());
delete session;
session = nullptr;
}
bool isNewSession = false;
if (!session)
{
session = new GarlicRoutingSession (destination, 4); // TODO: change it later
session = new GarlicRoutingSession (destination, 16); // TODO: change it later
m_Sessions[destination->GetIdentHash ()] = session;
isNewSession = true;
}
I2NPMessage * ret = session->WrapSingleMessage (msg, leaseSet);
if (session->GetNumRemainingSessionTags () <= 0)
{
m_Sessions.erase (destination->GetIdentHash ());
delete session;
}
if (isNewSession)
m_CreatedSessions[session->GetFirstMsgID ()] = session;
return ret;
}
@ -270,7 +293,7 @@ namespace garlic
uint32_t payloadSize = be32toh (*(uint32_t *)buf);
if (payloadSize > len)
{
LogPrint ("Unxpected payload size ", payloadSize);
LogPrint ("Unexpected payload size ", payloadSize);
return;
}
buf += 4;
@ -359,5 +382,17 @@ namespace garlic
buf += 3; // Certificate
}
}
void GarlicRouting::HandleDeliveryStatusMessage (uint8_t * buf, size_t len)
{
I2NPDeliveryStatusMsg * msg = (I2NPDeliveryStatusMsg *)buf;
auto it = m_CreatedSessions.find (be32toh (msg->msgID));
if (it != m_CreatedSessions.end ())
{
it->second->SetAcknowledged (true);
m_CreatedSessions.erase (it);
LogPrint ("Garlic message ", be32toh (msg->msgID), " acknowledged");
}
}
}
}

12
Garlic.h
Unescape Escape View File

@ -41,11 +41,15 @@ namespace garlic
~GarlicRoutingSession ();
I2NPMessage * WrapSingleMessage (I2NPMessage * msg, I2NPMessage * leaseSet);
int GetNumRemainingSessionTags () const { return m_NumTags - m_NextTag; };
uint32_t GetFirstMsgID () const { return m_FirstMsgID; };
bool IsAcknowledged () const { return m_IsAcknowledged; };
void SetAcknowledged (bool acknowledged) { m_IsAcknowledged = acknowledged; };
private:
size_t CreateAESBlock (uint8_t * buf, I2NPMessage * msg, I2NPMessage * leaseSet);
size_t CreateGarlicPayload (uint8_t * payload, I2NPMessage * msg, I2NPMessage * leaseSet);
size_t CreateAESBlock (uint8_t * buf, I2NPMessage * msg, I2NPMessage * leaseSet, bool isNewSession);
size_t CreateGarlicPayload (uint8_t * payload, I2NPMessage * msg, I2NPMessage * leaseSet, bool isNewSession);
size_t CreateGarlicClove (uint8_t * buf, I2NPMessage * msg, bool isDestination);
size_t CreateDeliveryStatusClove (uint8_t * buf, uint32_t msgID);
@ -53,6 +57,8 @@ namespace garlic
const i2p::data::RoutingDestination * m_Destination;
uint8_t m_SessionKey[32];
uint32_t m_FirstMsgID; // first message ID
bool m_IsAcknowledged;
int m_NumTags, m_NextTag;
uint8_t * m_SessionTags; // m_NumTags*32 bytes
@ -68,6 +74,7 @@ namespace garlic
~GarlicRouting ();
void HandleGarlicMessage (uint8_t * buf, size_t len, bool isFromTunnel);
void HandleDeliveryStatusMessage (uint8_t * buf, size_t len);
I2NPMessage * WrapSingleMessage (const i2p::data::RoutingDestination * destination,
I2NPMessage * msg, I2NPMessage * leaseSet = nullptr);
@ -81,6 +88,7 @@ namespace garlic
// outgoing sessions
std::map<i2p::data::IdentHash, GarlicRoutingSession *> m_Sessions;
std::map<uint32_t, GarlicRoutingSession *> m_CreatedSessions; // msgID -> session
// incoming session
std::map<std::string, std::string> m_SessionTags; // tag -> key
CryptoPP::CBC_Mode<CryptoPP::AES>::Decryption m_Decryption;

15
I2NPProtocol.cpp
Unescape Escape View File

@ -1,5 +1,5 @@
#include <string.h>
#include "I2PEndian.h"
#include <endian.h>
#include <cryptopp/sha.h>
#include <cryptopp/modes.h>
#include <cryptopp/aes.h>
@ -63,20 +63,13 @@ namespace i2p
{
I2NPMessage * msg = NewI2NPMessage ();
memcpy (msg->GetBuffer (), buf, len);
msg->len += msg->offset + len;
msg->len = msg->offset + len;
return msg;
}
I2NPMessage * CreateDeliveryStatusMsg (uint32_t msgID)
{
#pragma pack(1)
struct
{
uint32_t msgID;
uint64_t timestamp;
} msg;
#pragma pack ()
I2NPDeliveryStatusMsg msg;
msg.msgID = htobe32 (msgID);
msg.timestamp = htobe64 (i2p::util::GetMillisecondsSinceEpoch ());
return CreateI2NPMessage (eI2NPDeliveryStatus, (uint8_t *)&msg, sizeof (msg));
@ -431,6 +424,8 @@ namespace i2p
break;
case eI2NPDeliveryStatus:
LogPrint ("DeliveryStatus");
// we assume DeliveryStatusMessage is sent with garlic only
i2p::garlic::routing.HandleDeliveryStatusMessage (buf, size);
break;
case eI2NPVariableTunnelBuild:
LogPrint ("VariableTunnelBuild");

5
I2NPProtocol.h
Unescape Escape View File

@ -26,6 +26,11 @@ namespace i2p
uint32_t replyToken;
};
struct I2NPDeliveryStatusMsg
{
uint32_t msgID;
uint64_t timestamp;
};
struct I2NPBuildRequestRecordClearText
{

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