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synced 2024-10-01 02:35:48 -04:00
fixed generation of pseudo-random request ids in p3filelists
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@ -39,7 +39,7 @@
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#define P3FILELISTS_DEBUG() std::cerr << time(NULL) << " : FILE_LISTS : " << __FUNCTION__ << " : "
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#define P3FILELISTS_ERROR() std::cerr << "***ERROR***" << " : FILE_LISTS : " << __FUNCTION__ << " : "
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#define DEBUG_P3FILELISTS 1
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//#define DEBUG_P3FILELISTS 1
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static const uint32_t P3FILELISTS_UPDATE_FLAG_NOTHING_CHANGED = 0x0000 ;
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static const uint32_t P3FILELISTS_UPDATE_FLAG_REMOTE_MAP_CHANGED = 0x0001 ;
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@ -1454,25 +1454,23 @@ void p3FileDatabase::locked_recursSweepRemoteDirectory(RemoteDirectoryStorage *r
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p3FileDatabase::DirSyncRequestId p3FileDatabase::makeDirSyncReqId(const RsPeerId& peer_id,const RsFileHash& hash)
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{
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static uint64_t random_bias = RSRandom::random_u64();
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uint64_t r = 0 ;
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uint8_t mem[RsPeerId::SIZE_IN_BYTES + RsFileHash::SIZE_IN_BYTES];
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memcpy(mem,peer_id.toByteArray(),RsPeerId::SIZE_IN_BYTES) ;
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memcpy(&mem[RsPeerId::SIZE_IN_BYTES],hash.toByteArray(),RsFileHash::SIZE_IN_BYTES) ;
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RsFileHash tmp = RsDirUtil::sha1sum(mem,RsPeerId::SIZE_IN_BYTES + RsFileHash::SIZE_IN_BYTES) ;
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// This is kind of arbitrary. The important thing is that the same ID needs to be generated every time for a given (peer_id,entry index) pair, in a way
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// that cannot be brute-forced or reverse-engineered, which explains the random bias and the usage of the hash, that is itself random.
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for(uint32_t i=0;i<RsPeerId::SIZE_IN_BYTES;++i)
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{
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r ^= (0x011933ff92892a94 + peer_id.toByteArray()[i] * 0x1001fff92ee640f9) ;
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r <<= 8 ;
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r += 0xf392843890321808;
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}
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for(uint32_t i=0;i<RsFileHash::SIZE_IN_BYTES;++i)
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{
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r ^= (0x011933ff92892a94 + hash.toByteArray()[i] * 0x1001fff92ee640f9) ;
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r <<= 8 ;
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r += 0xf392843890321808;
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}
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uint64_t r = random_bias ^ *((uint64_t*)tmp.toByteArray()) ;
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return r ^ random_bias;
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#ifdef DEBUG_P3FILELISTS
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std::cerr << "Creating ID " << std::hex << r << std::dec << " from peer id " << peer_id << " and hash " << hash << std::endl;
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#endif
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return r ;
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}
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bool p3FileDatabase::locked_generateAndSendSyncRequest(RemoteDirectoryStorage *rds,const DirectoryStorage::EntryIndex& e)
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@ -1522,7 +1520,7 @@ bool p3FileDatabase::locked_generateAndSendSyncRequest(RemoteDirectoryStorage *r
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data.flags = item->flags;
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#ifdef DEBUG_P3FILELISTS
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P3FILELISTS_DEBUG() << " Pushing req in pending list with peer id " << data.peer_id << std::endl;
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P3FILELISTS_DEBUG() << " Pushing req " << std::hex << sync_req_id << std::dec << " in pending list with peer id " << data.peer_id << std::endl;
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#endif
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mPendingSyncRequests[sync_req_id] = data ;
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