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fix off by ones

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This commit is contained in:
Jeff Becker 2016-07-15 12:49:45 -04:00
parent 24aff15752
commit 75fc8202ab
No known key found for this signature in database
GPG Key ID: AB950234D6EA286B
3 changed files with 17 additions and 11 deletions
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4
I2NPProtocol.cpp
View File

@ -165,7 +165,7 @@ namespace i2p
buf += 32;
memcpy (buf, replyTunnel->GetNextIdentHash (), 32); // reply tunnel GW
buf += 32;
*buf = DATABASE_LOOKUP_DELIVERY_FLAG | DATABASE_LOOKUP_ENCYPTION_FLAG | DATABASE_LOOKUP_TYPE_LEASESET_LOOKUP; // flags
*buf = DATABASE_LOOKUP_DELIVERY_FLAG | DATABASE_LOOKUP_ENCRYPTION_FLAG | DATABASE_LOOKUP_TYPE_LEASESET_LOOKUP; // flags
htobe32buf (buf + 1, replyTunnel->GetNextTunnelID ()); // reply tunnel ID
buf += 5;
@ -182,7 +182,7 @@ namespace i2p
}
// encryption
memcpy (buf, replyKey, 32);
buf[32] = 1; // 1 tag
buf[32] = (uint8_t) 1; // 1 tag
memcpy (buf + 33, replyTag, 32);
buf += 65;

2
I2NPProtocol.h
View File

@ -90,7 +90,7 @@ namespace i2p
// DatabaseLookup flags
const uint8_t DATABASE_LOOKUP_DELIVERY_FLAG = 0x01;
const uint8_t DATABASE_LOOKUP_ENCYPTION_FLAG = 0x02;
const uint8_t DATABASE_LOOKUP_ENCRYPTION_FLAG = 0x02;
const uint8_t DATABASE_LOOKUP_TYPE_FLAGS_MASK = 0x0C;
const uint8_t DATABASE_LOOKUP_TYPE_NORMAL_LOOKUP = 0;
const uint8_t DATABASE_LOOKUP_TYPE_LEASESET_LOOKUP = 0x04; // 0100

22
NetDb.cpp
View File

@ -632,17 +632,18 @@ namespace data
char key[48];
int l = i2p::data::ByteStreamToBase64 (buf, 32, key, 48);
key[l] = 0;
uint8_t flag = buf[64];
IdentHash replyIdent(buf + 32);
uint8_t flag = buf[64];
LogPrint (eLogDebug, "NetDb: DatabaseLookup for ", key, " recieved flags=", (int)flag);
uint8_t lookupType = flag & DATABASE_LOOKUP_TYPE_FLAGS_MASK;
const uint8_t * excluded = buf + 65;
uint32_t replyTunnelID = 0;
if (flag & DATABASE_LOOKUP_DELIVERY_FLAG) //reply to tunnel
{
replyTunnelID = bufbe32toh (buf + 65);
replyTunnelID = bufbe32toh (excluded);
excluded += 4;
}
uint16_t numExcluded = bufbe16toh (excluded);
@ -650,7 +651,7 @@ namespace data
if (numExcluded > 512)
{
LogPrint (eLogWarning, "NetDb: number of excluded peers", numExcluded, " exceeds 512");
numExcluded = 0; // TODO:
return;
}
std::shared_ptr<I2NPMessage> replyMsg;
@ -733,6 +734,8 @@ namespace data
if (!numExcluded) // save if no excluded
m_LookupResponses[ident] = std::make_pair(closestFloodfills, i2p::util::GetSecondsSinceEpoch ());
}
else
excluded += numExcluded * 32;
replyMsg = CreateDatabaseSearchReply (ident, closestFloodfills);
}
}
@ -742,16 +745,19 @@ namespace data
if (replyTunnelID)
{
// encryption might be used though tunnel only
if (flag & DATABASE_LOOKUP_ENCYPTION_FLAG) // encrypted reply requested
if (flag & DATABASE_LOOKUP_ENCRYPTION_FLAG) // encrypted reply requested
{
const uint8_t * sessionKey = excluded;
uint8_t numTags = sessionKey[32];
if (numTags > 0)
const uint8_t numTags = excluded[32];
if (numTags)
{
const uint8_t * sessionTag = sessionKey + 33; // take first tag
const i2p::garlic::SessionTag sessionTag(excluded + 33); // take first tag
i2p::garlic::GarlicRoutingSession garlic (sessionKey, sessionTag);
replyMsg = garlic.WrapSingleMessage (replyMsg);
if(replyMsg == nullptr) LogPrint(eLogError, "NetDb: failed to wrap message");
}
else
LogPrint(eLogWarning, "NetDb: encrypted reply requested but no tags provided");
}
auto exploratoryPool = i2p::tunnel::tunnels.GetExploratoryPool ();
auto outbound = exploratoryPool ? exploratoryPool->GetNextOutboundTunnel () : nullptr;