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fill clear text buffer of BuildRequestRecord

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orignal 2015-01-03 23:13:07 -05:00
parent 7a387b9a9f
commit ecf709cbba
4 changed files with 46 additions and 11 deletions
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8
I2NPProtocol.cpp
View File

@ -314,7 +314,13 @@ namespace i2p
{
router.GetElGamalEncryption ()->Encrypt ((uint8_t *)&clearText, sizeof(clearText), record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET);
memcpy (record + BUILD_REQUEST_RECORD_TO_PEER_OFFSET, (const uint8_t *)router.GetIdentHash (), 16);
}
}
void EncryptBuildRequestRecord (const i2p::data::RouterInfo& router, const uint8_t * clearText, uint8_t * record)
{
router.GetElGamalEncryption ()->Encrypt (clearText, BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE, record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET);
memcpy (record + BUILD_REQUEST_RECORD_TO_PEER_OFFSET, (const uint8_t *)router.GetIdentHash (), 16);
}
bool HandleBuildRequestRecords (int num, uint8_t * records, I2NPBuildRequestRecordClearText& clearText)
{

16
I2NPProtocol.h
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@ -43,6 +43,21 @@ namespace i2p
// TunnelBuild
const size_t TUNNEL_BUILD_RECORD_SIZE = 528;
//BuildRequestRecordClearText
const size_t BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET = 0;
const size_t BUILD_REQUEST_RECORD_OUR_IDENT_OFFSET = BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET + 4;
const size_t BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET = BUILD_REQUEST_RECORD_OUR_IDENT_OFFSET + 32;
const size_t BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET = BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET + 4;
const size_t BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET = BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET + 32;
const size_t BUILD_REQUEST_RECORD_IV_KEY_OFFSET = BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET + 32;
const size_t BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET = BUILD_REQUEST_RECORD_IV_KEY_OFFSET + 32;
const size_t BUILD_REQUEST_RECORD_REPLY_IV_OFFSET = BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET + 32;
const size_t BUILD_REQUEST_RECORD_FLAG_OFFSET = BUILD_REQUEST_RECORD_REPLY_IV_OFFSET + 16;
const size_t BUILD_REQUEST_RECORD_REQUEST_TIME_OFFSET = BUILD_REQUEST_RECORD_FLAG_OFFSET + 1;
const size_t BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET = BUILD_REQUEST_RECORD_REQUEST_TIME_OFFSET + 4;
const size_t BUILD_REQUEST_RECORD_PADDING_OFFSET = BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET + 4;
const size_t BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE = 222;
// BuildRequestRecordEncrypted
const size_t BUILD_REQUEST_RECORD_TO_PEER_OFFSET = 0;
@ -214,6 +229,7 @@ namespace tunnel
bool isGateway, bool isEndpoint);
void EncryptBuildRequestRecord (const i2p::data::RouterInfo& router,
const I2NPBuildRequestRecordClearText& clearText, uint8_t * record);
void EncryptBuildRequestRecord (const i2p::data::RouterInfo& router, const uint8_t * clearText, uint8_t * record);
bool HandleBuildRequestRecords (int num, uint8_t * records, I2NPBuildRequestRecordClearText& clearText);
void HandleVariableTunnelBuildMsg (uint32_t replyMsgID, uint8_t * buf, size_t len);

13
Tunnel.cpp
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@ -48,16 +48,9 @@ namespace tunnel
while (hop)
{
int idx = recordIndicies[i];
EncryptBuildRequestRecord (*hop->router,
CreateBuildRequestRecord (hop->router->GetIdentHash (),
hop->tunnelID,
hop->nextRouter->GetIdentHash (),
hop->nextTunnelID,
hop->layerKey, hop->ivKey,
hop->replyKey, hop->replyIV,
hop->next ? rnd.GenerateWord32 () : replyMsgID, // we set replyMsgID for last hop only
hop->isGateway, hop->isEndpoint),
records + idx*TUNNEL_BUILD_RECORD_SIZE);
uint8_t clearText[BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
hop->CreateBuildRequestRecord (clearText, hop->next ? rnd.GenerateWord32 () : replyMsgID); // we set replyMsgID for last hop only
EncryptBuildRequestRecord (*hop->router, clearText, records + idx*TUNNEL_BUILD_RECORD_SIZE);
hop->recordIndex = idx;
i++;
hop = hop->next;

20
TunnelConfig.h
View File

@ -8,6 +8,7 @@
#include "aes.h"
#include "RouterInfo.h"
#include "RouterContext.h"
#include "Timestamp.h"
namespace i2p
{
@ -82,6 +83,25 @@ namespace tunnel
isGateway = false;
}
}
void CreateBuildRequestRecord (uint8_t * record, uint32_t replyMsgID)
{
htobe32buf (record + BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET, tunnelID);
memcpy (record + BUILD_REQUEST_RECORD_OUR_IDENT_OFFSET, router->GetIdentHash (), 32);
htobe32buf (record + BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET, nextTunnelID);
memcpy (record + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET, nextRouter->GetIdentHash (), 32);
memcpy (record + BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET, layerKey, 32);
memcpy (record + BUILD_REQUEST_RECORD_IV_KEY_OFFSET, ivKey, 32);
memcpy (record + BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET, replyKey, 32);
memcpy (record + BUILD_REQUEST_RECORD_REPLY_IV_OFFSET, replyIV, 16);
uint8_t flag = 0;
if (isGateway) flag |= 0x80;
if (isEndpoint) flag |= 0x40;
record[BUILD_REQUEST_RECORD_FLAG_OFFSET] = flag;
htobe32buf (record + BUILD_REQUEST_RECORD_REQUEST_TIME_OFFSET, i2p::util::GetHoursSinceEpoch ());
htobe32buf (record + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET, replyMsgID);
// TODO: fill padding
}
};
class TunnelConfig