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don't rely on order in tunnel build message. assign index to hop instead

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orignal 2014-06-18 19:38:21 -04:00
parent b95caaf219
commit 59439ebf26
2 changed files with 25 additions and 12 deletions
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36
Tunnel.cpp
View File

@ -48,22 +48,27 @@ namespace tunnel
hop->next ? rnd.GenerateWord32 () : replyMsgID, // we set replyMsgID for last hop only
hop->isGateway, hop->isEndpoint),
records[i]);
hop->recordIndex = i; //TODO:
i++;
hop = hop->next;
}
i2p::crypto::CBCDecryption decryption;
hop = m_Config->GetLastHop ()->prev;
size_t ind = numRecords - 1;
while (hop)
{
decryption.SetKey (hop->replyKey);
decryption.SetIV (hop->replyIV);
for (size_t i = ind; i < numRecords; i++)
decryption.Decrypt((uint8_t *)&records[i],
sizeof (I2NPBuildRequestRecordElGamalEncrypted), (uint8_t *)&records[i]);
// decrypt records after current hop
TunnelHopConfig * hop1 = hop->next;
while (hop1)
{
decryption.Decrypt((uint8_t *)&records[hop1->recordIndex],
sizeof (I2NPBuildRequestRecordElGamalEncrypted),
(uint8_t *)&records[hop1->recordIndex]);
hop1 = hop1->next;
}
hop = hop->prev;
ind--;
}
FillI2NPMessageHeader (msg, eI2NPVariableTunnelBuild);
@ -76,21 +81,28 @@ namespace tunnel
bool Tunnel::HandleTunnelBuildResponse (uint8_t * msg, size_t len)
{
LogPrint ("TunnelBuildResponse ", (int)msg[0], " records.");
auto numHops = m_Config->GetNumHops ();
if (msg[0] != numHops)
{
LogPrint ("Number of records in response ", (int)msg[0], " doesn't match ", numHops);
return false;
}
i2p::crypto::CBCDecryption decryption;
TunnelHopConfig * hop = m_Config->GetLastHop ();
int num = msg[0];
while (hop)
{
decryption.SetKey (hop->replyKey);
decryption.SetIV (hop->replyIV);
for (int i = 0; i < num; i++)
{
uint8_t * record = msg + 1 + i*sizeof (I2NPBuildResponseRecord);
// decrypt records before and including current hop
TunnelHopConfig * hop1 = hop;
while (hop1)
{
uint8_t * record = msg + 1 + hop1->recordIndex*sizeof (I2NPBuildResponseRecord);
decryption.Decrypt(record, sizeof (I2NPBuildResponseRecord), record);
}
hop1 = hop1->prev;
}
hop = hop->prev;
num--;
}
m_IsEstablished = true;

1
TunnelConfig.h
View File

@ -24,6 +24,7 @@ namespace tunnel
TunnelHopConfig * next, * prev;
i2p::crypto::TunnelDecryption decryption;
int recordIndex; // record # in tunnel build message
TunnelHopConfig (const i2p::data::RouterInfo * r)
{