PurpleI2P
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i2pd
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change datagram routing path if nothing comes back in 10 seconds

pull/1560/head
orignal 4 years ago
parent
67b94d3533
commit
c41554109b
4 changed files with 85 additions and 70 deletions
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  1. 7
      libi2pd/Datagram.cpp
  2. 136
      libi2pd/ECIESX25519AEADRatchetSession.cpp
  3. 7
      libi2pd/ECIESX25519AEADRatchetSession.h
  4. 1
      libi2pd/Garlic.h

7
libi2pd/Datagram.cpp
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@ -315,6 +315,13 @@ namespace datagram @@ -315,6 +315,13 @@ namespace datagram
}
auto path = m_RoutingSession->GetSharedRoutingPath();
if (path && m_RoutingSession->IsRatchets () &&
m_LastUse > m_RoutingSession->GetLastActivityTimestamp ()*1000 + DATAGRAM_SESSION_PATH_TIMEOUT)
{
m_RoutingSession->SetSharedRoutingPath (nullptr);
path = nullptr;
}
if (path)
{
if (path->outboundTunnel && !path->outboundTunnel->IsEstablished ())

136
libi2pd/ECIESX25519AEADRatchetSession.cpp
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@ -770,7 +770,7 @@ namespace garlic @@ -770,7 +770,7 @@ namespace garlic
if (m_NextSendRatchet->newKey) payloadLen += 32;
}
uint8_t paddingSize = 0;
if (payloadLen)
if (payloadLen || ts > m_LastSentTimestamp + ECIESX25519_SEND_INACTIVITY_TIMEOUT)
{
int delta = (int)ECIESX25519_OPTIMAL_PAYLOAD_SIZE - (int)payloadLen;
if (delta < 0 || delta > 3) // don't create padding if we are close to optimal size
@ -791,83 +791,87 @@ namespace garlic @@ -791,83 +791,87 @@ namespace garlic
}
}
std::vector<uint8_t> v(payloadLen);
size_t offset = 0;
// DateTime
if (first)
{
v[offset] = eECIESx25519BlkDateTime; offset++;
htobe16buf (v.data () + offset, 4); offset += 2;
htobe32buf (v.data () + offset, ts/1000); offset += 4; // in seconds
}
// LeaseSet
if (leaseSet)
if (payloadLen)
{
offset += CreateLeaseSetClove (leaseSet, ts, v.data () + offset, payloadLen - offset);
if (!first)
m_LastSentTimestamp = ts;
size_t offset = 0;
// DateTime
if (first)
{
// ack request
v[offset] = eECIESx25519BlkAckRequest; offset++;
htobe16buf (v.data () + offset, 1); offset += 2;
v[offset] = 0; offset++; // flags
v[offset] = eECIESx25519BlkDateTime; offset++;
htobe16buf (v.data () + offset, 4); offset += 2;
htobe32buf (v.data () + offset, ts/1000); offset += 4; // in seconds
}
}
// msg
if (msg && m_Destination)
offset += CreateGarlicClove (msg, v.data () + offset, payloadLen - offset, true);
// ack
if (m_AckRequests.size () > 0)
{
v[offset] = eECIESx25519BlkAck; offset++;
htobe16buf (v.data () + offset, m_AckRequests.size () * 4); offset += 2;
for (auto& it: m_AckRequests)
// LeaseSet
if (leaseSet)
{
htobe16buf (v.data () + offset, it.first); offset += 2;
htobe16buf (v.data () + offset, it.second); offset += 2;
offset += CreateLeaseSetClove (leaseSet, ts, v.data () + offset, payloadLen - offset);
if (!first)
{
// ack request
v[offset] = eECIESx25519BlkAckRequest; offset++;
htobe16buf (v.data () + offset, 1); offset += 2;
v[offset] = 0; offset++; // flags
}
}
m_AckRequests.clear ();
}
// next keys
if (m_SendReverseKey)
{
v[offset] = eECIESx25519BlkNextKey; offset++;
htobe16buf (v.data () + offset, m_NextReceiveRatchet->newKey ? 35 : 3); offset += 2;
v[offset] = ECIESX25519_NEXT_KEY_REVERSE_KEY_FLAG;
int keyID = m_NextReceiveRatchet->keyID - 1;
if (m_NextReceiveRatchet->newKey)
// msg
if (msg && m_Destination)
offset += CreateGarlicClove (msg, v.data () + offset, payloadLen - offset, true);
// ack
if (m_AckRequests.size () > 0)
{
v[offset] |= ECIESX25519_NEXT_KEY_KEY_PRESENT_FLAG;
keyID++;
v[offset] = eECIESx25519BlkAck; offset++;
htobe16buf (v.data () + offset, m_AckRequests.size () * 4); offset += 2;
for (auto& it: m_AckRequests)
{
htobe16buf (v.data () + offset, it.first); offset += 2;
htobe16buf (v.data () + offset, it.second); offset += 2;
}
m_AckRequests.clear ();
}
offset++; // flag
htobe16buf (v.data () + offset, keyID); offset += 2; // keyid
if (m_NextReceiveRatchet->newKey)
// next keys
if (m_SendReverseKey)
{
memcpy (v.data () + offset, m_NextReceiveRatchet->key->GetPublicKey (), 32);
offset += 32; // public key
v[offset] = eECIESx25519BlkNextKey; offset++;
htobe16buf (v.data () + offset, m_NextReceiveRatchet->newKey ? 35 : 3); offset += 2;
v[offset] = ECIESX25519_NEXT_KEY_REVERSE_KEY_FLAG;
int keyID = m_NextReceiveRatchet->keyID - 1;
if (m_NextReceiveRatchet->newKey)
{
v[offset] |= ECIESX25519_NEXT_KEY_KEY_PRESENT_FLAG;
keyID++;
}
offset++; // flag
htobe16buf (v.data () + offset, keyID); offset += 2; // keyid
if (m_NextReceiveRatchet->newKey)
{
memcpy (v.data () + offset, m_NextReceiveRatchet->key->GetPublicKey (), 32);
offset += 32; // public key
}
m_SendReverseKey = false;
}
m_SendReverseKey = false;
}
if (m_SendForwardKey)
{
v[offset] = eECIESx25519BlkNextKey; offset++;
htobe16buf (v.data () + offset, m_NextSendRatchet->newKey ? 35 : 3); offset += 2;
v[offset] = m_NextSendRatchet->newKey ? ECIESX25519_NEXT_KEY_KEY_PRESENT_FLAG : ECIESX25519_NEXT_KEY_REQUEST_REVERSE_KEY_FLAG;
if (!m_NextSendRatchet->keyID) v[offset] |= ECIESX25519_NEXT_KEY_REQUEST_REVERSE_KEY_FLAG; // for first key only
offset++; // flag
htobe16buf (v.data () + offset, m_NextSendRatchet->keyID); offset += 2; // keyid
if (m_NextSendRatchet->newKey)
if (m_SendForwardKey)
{
v[offset] = eECIESx25519BlkNextKey; offset++;
htobe16buf (v.data () + offset, m_NextSendRatchet->newKey ? 35 : 3); offset += 2;
v[offset] = m_NextSendRatchet->newKey ? ECIESX25519_NEXT_KEY_KEY_PRESENT_FLAG : ECIESX25519_NEXT_KEY_REQUEST_REVERSE_KEY_FLAG;
if (!m_NextSendRatchet->keyID) v[offset] |= ECIESX25519_NEXT_KEY_REQUEST_REVERSE_KEY_FLAG; // for first key only
offset++; // flag
htobe16buf (v.data () + offset, m_NextSendRatchet->keyID); offset += 2; // keyid
if (m_NextSendRatchet->newKey)
{
memcpy (v.data () + offset, m_NextSendRatchet->key->GetPublicKey (), 32);
offset += 32; // public key
}
}
// padding
if (paddingSize)
{
memcpy (v.data () + offset, m_NextSendRatchet->key->GetPublicKey (), 32);
offset += 32; // public key
v[offset] = eECIESx25519BlkPadding; offset++;
htobe16buf (v.data () + offset, paddingSize); offset += 2;
memset (v.data () + offset, 0, paddingSize); offset += paddingSize;
}
}
// padding
if (paddingSize)
{
v[offset] = eECIESx25519BlkPadding; offset++;
htobe16buf (v.data () + offset, paddingSize); offset += 2;
memset (v.data () + offset, 0, paddingSize); offset += paddingSize;
}
return v;
}

7
libi2pd/ECIESX25519AEADRatchetSession.h
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@ -27,7 +27,8 @@ namespace garlic @@ -27,7 +27,8 @@ namespace garlic
{
const int ECIESX25519_RESTART_TIMEOUT = 120; // number of second since session creation we can restart session after
const int ECIESX25519_EXPIRATION_TIMEOUT = 480; // in seconds
const int ECIESX25519_INACTIVITY_TIMEOUT = 90; // number of second we receive nothing and should restart if we can
const int ECIESX25519_INACTIVITY_TIMEOUT = 90; // number of seconds we receive nothing and should restart if we can
const int ECIESX25519_SEND_INACTIVITY_TIMEOUT = 5000; // number of milliseconds we can send empty(pyaload only) packet after
const int ECIESX25519_INCOMING_TAGS_EXPIRATION_TIMEOUT = 600; // in seconds
const int ECIESX25519_PREVIOUS_TAGSET_EXPIRATION_TIMEOUT = 180; // 180
const int ECIESX25519_TAGSET_MAX_NUM_TAGS = 4096; // number of tags we request new tagset after
@ -148,6 +149,7 @@ namespace garlic @@ -148,6 +149,7 @@ namespace garlic
bool IsInactive (uint64_t ts) const { return ts > m_LastActivityTimestamp + ECIESX25519_INACTIVITY_TIMEOUT && CanBeRestarted (ts); }
bool IsRatchets () const { return true; };
uint64_t GetLastActivityTimestamp () const { return m_LastActivityTimestamp; };
private:
@ -182,7 +184,8 @@ namespace garlic @@ -182,7 +184,8 @@ namespace garlic
uint8_t m_NSREncodedKey[32], m_NSRH[32], m_NSRKey[32]; // new session reply, for incoming only
std::shared_ptr<i2p::crypto::X25519Keys> m_EphemeralKeys;
SessionState m_State = eSessionStateNew;
uint64_t m_SessionCreatedTimestamp = 0, m_LastActivityTimestamp = 0; // incoming
uint64_t m_SessionCreatedTimestamp = 0, m_LastActivityTimestamp = 0, // incoming
m_LastSentTimestamp = 0; // in milliseconds
std::shared_ptr<RatchetTagSet> m_SendTagset, m_NSRSendTagset;
std::unique_ptr<i2p::data::IdentHash> m_Destination;// TODO: might not need it
std::list<std::pair<uint16_t, int> > m_AckRequests; // (tagsetid, index)

1
libi2pd/Garlic.h
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@ -114,6 +114,7 @@ namespace garlic @@ -114,6 +114,7 @@ namespace garlic
virtual bool CleanupUnconfirmedTags () { return false; }; // for I2CP, override in ElGamalAESSession
virtual bool MessageConfirmed (uint32_t msgID);
virtual bool IsRatchets () const { return false; };
virtual uint64_t GetLastActivityTimestamp () const { return 0; }; // non-zero for rathets only
void SetLeaseSetUpdated ()
{

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