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@ -284,45 +284,8 @@ namespace i2p
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FillI2NPMessageHeader (m, eI2NPDatabaseStore);
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return m;
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}
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I2NPBuildRequestRecordClearText CreateBuildRequestRecord (
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const uint8_t * ourIdent, uint32_t receiveTunnelID,
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const uint8_t * nextIdent, uint32_t nextTunnelID,
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const uint8_t * layerKey,const uint8_t * ivKey,
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const uint8_t * replyKey, const uint8_t * replyIV, uint32_t nextMessageID,
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bool isGateway, bool isEndpoint)
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{
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I2NPBuildRequestRecordClearText clearText;
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clearText.receiveTunnel = htobe32 (receiveTunnelID);
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clearText.nextTunnel = htobe32(nextTunnelID);
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memcpy (clearText.layerKey, layerKey, 32);
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memcpy (clearText.ivKey, ivKey, 32);
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memcpy (clearText.replyKey, replyKey, 32);
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memcpy (clearText.replyIV, replyIV, 16);
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clearText.flag = 0;
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if (isGateway) clearText.flag |= 0x80;
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if (isEndpoint) clearText.flag |= 0x40;
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memcpy (clearText.ourIdent, ourIdent, 32);
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memcpy (clearText.nextIdent, nextIdent, 32);
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clearText.requestTime = htobe32 (i2p::util::GetHoursSinceEpoch ());
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clearText.nextMessageID = htobe32(nextMessageID);
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return clearText;
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}
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void EncryptBuildRequestRecord (const i2p::data::RouterInfo& router,
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const I2NPBuildRequestRecordClearText& clearText, uint8_t * record)
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{
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router.GetElGamalEncryption ()->Encrypt ((uint8_t *)&clearText, sizeof(clearText), record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET);
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memcpy (record + BUILD_REQUEST_RECORD_TO_PEER_OFFSET, (const uint8_t *)router.GetIdentHash (), 16);
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}
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void EncryptBuildRequestRecord (const i2p::data::RouterInfo& router, const uint8_t * clearText, uint8_t * record)
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{
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router.GetElGamalEncryption ()->Encrypt (clearText, BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE, record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET);
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memcpy (record + BUILD_REQUEST_RECORD_TO_PEER_OFFSET, (const uint8_t *)router.GetIdentHash (), 16);
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}
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bool HandleBuildRequestRecords (int num, uint8_t * records, I2NPBuildRequestRecordClearText& clearText)
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bool HandleBuildRequestRecords (int num, uint8_t * records, uint8_t * clearText)
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{
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for (int i = 0; i < num; i++)
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{
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@ -331,16 +294,19 @@ namespace i2p
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{
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LogPrint ("Record ",i," is ours");
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i2p::crypto::ElGamalDecrypt (i2p::context.GetEncryptionPrivateKey (), record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, (uint8_t *)&clearText);
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i2p::crypto::ElGamalDecrypt (i2p::context.GetEncryptionPrivateKey (), record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, clearText);
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// replace record to reply
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if (i2p::context.AcceptsTunnels ())
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{
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i2p::tunnel::TransitTunnel * transitTunnel =
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i2p::tunnel::CreateTransitTunnel (
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be32toh (clearText.receiveTunnel),
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clearText.nextIdent, be32toh (clearText.nextTunnel),
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clearText.layerKey, clearText.ivKey,
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clearText.flag & 0x80, clearText.flag & 0x40);
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bufbe32toh (clearText + BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET),
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clearText + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
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bufbe32toh (clearText + BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
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clearText + BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET,
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clearText + BUILD_REQUEST_RECORD_IV_KEY_OFFSET,
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clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET] & 0x80,
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clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET ] & 0x40);
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i2p::tunnel::tunnels.AddTransitTunnel (transitTunnel);
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record[BUILD_RESPONSE_RECORD_RET_OFFSET] = 0;
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}
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@ -354,8 +320,8 @@ namespace i2p
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i2p::crypto::CBCEncryption encryption;
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for (int j = 0; j < num; j++)
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{
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encryption.SetKey (clearText.replyKey);
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encryption.SetIV (clearText.replyIV);
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encryption.SetKey (clearText + BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET);
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encryption.SetIV (clearText + BUILD_REQUEST_RECORD_REPLY_IV_OFFSET);
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uint8_t * reply = records + j*TUNNEL_BUILD_RECORD_SIZE;
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encryption.Encrypt(reply, TUNNEL_BUILD_RECORD_SIZE, reply);
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}
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@ -389,40 +355,42 @@ namespace i2p
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}
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else
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{
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I2NPBuildRequestRecordClearText clearText;
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uint8_t clearText[BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
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if (HandleBuildRequestRecords (num, buf + 1, clearText))
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{
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if (clearText.flag & 0x40) // we are endpoint of outboud tunnel
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if (clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET] & 0x40) // we are endpoint of outboud tunnel
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{
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// so we send it to reply tunnel
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transports.SendMessage (clearText.nextIdent,
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CreateTunnelGatewayMsg (be32toh (clearText.nextTunnel),
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transports.SendMessage (clearText + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
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CreateTunnelGatewayMsg (bufbe32toh (clearText + BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
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eI2NPVariableTunnelBuildReply, buf, len,
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be32toh (clearText.nextMessageID)));
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bufbe32toh (clearText + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
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}
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else
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transports.SendMessage (clearText.nextIdent,
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CreateI2NPMessage (eI2NPVariableTunnelBuild, buf, len, be32toh (clearText.nextMessageID)));
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transports.SendMessage (clearText + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
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CreateI2NPMessage (eI2NPVariableTunnelBuild, buf, len,
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bufbe32toh (clearText + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
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}
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}
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}
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void HandleTunnelBuildMsg (uint8_t * buf, size_t len)
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{
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I2NPBuildRequestRecordClearText clearText;
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uint8_t clearText[BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
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if (HandleBuildRequestRecords (NUM_TUNNEL_BUILD_RECORDS, buf, clearText))
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{
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if (clearText.flag & 0x40) // we are endpoint of outbound tunnel
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if (clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET] & 0x40) // we are endpoint of outbound tunnel
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{
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// so we send it to reply tunnel
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transports.SendMessage (clearText.nextIdent,
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CreateTunnelGatewayMsg (be32toh (clearText.nextTunnel),
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transports.SendMessage (clearText + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
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CreateTunnelGatewayMsg (bufbe32toh (clearText + BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
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eI2NPTunnelBuildReply, buf, len,
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be32toh (clearText.nextMessageID)));
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bufbe32toh (clearText + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
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}
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else
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transports.SendMessage (clearText.nextIdent,
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CreateI2NPMessage (eI2NPTunnelBuild, buf, len, be32toh (clearText.nextMessageID)));
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transports.SendMessage (clearText + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
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CreateI2NPMessage (eI2NPTunnelBuild, buf, len,
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bufbe32toh (clearText + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
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}
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}
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