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decline transit tunnel to duplicated router

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orignal 2025-01-31 11:20:39 -05:00
parent eadeea76e7
commit 972b66f9a5
3 changed files with 46 additions and 19 deletions

55
libi2pd/TransitTunnel.cpp
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@ -349,15 +349,23 @@ namespace tunnel
if (!retCode)
{
// create new transit tunnel
transitTunnel = i2p::tunnel::CreateTransitTunnel (
bufbe32toh (clearText + SHORT_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET),
clearText + SHORT_REQUEST_RECORD_NEXT_IDENT_OFFSET,
bufbe32toh (clearText + SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
layerKey, ivKey,
clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_GATEWAY_FLAG,
clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG);
if (!AddTransitTunnel (transitTunnel))
i2p::data::IdentHash nextIdent(clearText + SHORT_REQUEST_RECORD_NEXT_IDENT_OFFSET);
bool isEndpoint = clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG;
if (isEndpoint || !i2p::data::IsRouterDuplicated (nextIdent))
{
// create new transit tunnel
transitTunnel = CreateTransitTunnel (
bufbe32toh (clearText + SHORT_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET),
nextIdent,
bufbe32toh (clearText + SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
layerKey, ivKey,
clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_GATEWAY_FLAG,
isEndpoint);
if (!AddTransitTunnel (transitTunnel))
retCode = 30;
}
else
// decline tunnel going to duplicated router
retCode = 30;
}
@ -477,23 +485,32 @@ namespace tunnel
accept = false;
}
}
// replace record to reply
if (accept)
{
auto transitTunnel = i2p::tunnel::CreateTransitTunnel (
bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET),
clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
clearText + ECIES_BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET,
clearText + ECIES_BUILD_REQUEST_RECORD_IV_KEY_OFFSET,
clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_GATEWAY_FLAG,
clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG);
if (!AddTransitTunnel (transitTunnel))
i2p::data::IdentHash nextIdent(clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET);
bool isEndpoint = clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG;
if (isEndpoint || !i2p::data::IsRouterDuplicated (nextIdent))
{
auto transitTunnel = CreateTransitTunnel (
bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET),
nextIdent,
bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
clearText + ECIES_BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET,
clearText + ECIES_BUILD_REQUEST_RECORD_IV_KEY_OFFSET,
clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_GATEWAY_FLAG,
isEndpoint);
if (!AddTransitTunnel (transitTunnel))
retCode = 30;
}
else
// decline tunnel going to duplicated router
retCode = 30;
}
else
retCode = 30; // always reject with bandwidth reason (30)
// replace record to reply
memset (record + ECIES_BUILD_RESPONSE_RECORD_OPTIONS_OFFSET, 0, 2); // no options
record[ECIES_BUILD_RESPONSE_RECORD_RET_OFFSET] = retCode;
// encrypt reply