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Reusable transparent log database
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Tlogdb is a trivial transparent log client and server. It is meant as more a starting point to be customized than a tool to be used directly. A transparent log is a tamper-proof, append-only, immutable log of data records. That is, if the server were to violate the “append-only, immutable” properties, that tampering would be detected by the client. For more about transparent logs, see https://research.swtch.com/tlog. Server Operations To create a new log (new server state): tlogdb [-f file] newlog $servername The newlog command creates a new database in file (default tlog.db) containing an empty log and a newly generated public/private key pair for the server using the given name. The newlog command prints the newly generated public key. To see it again: tlogdb [-f file] publickey To add a record named name to the log: cat data | tlogdb [-f file] add name To serve the authenticated log data: tlogdb [-a addr] [-f file] serve The default server address is localhost:6655. Client Operations The client maintains a cache database both for performance (avoiding duplicate downloads) and for storing the server's public key and the most recently seen log head. To create a new client cache: tlogdb [-c file] newcache key The newcache command creates a new database in file (default tlogclient.db) and stores the given public key for later use. The key should be the output of the tlogdb's server commands newlog or publickey, described above. To look up a record in the log: tlogdb [-a addr] [-c file] lookup name The default server address is again localhost:6655. Example Putting the various commands together in a Unix shell: rm -f tlog.db tlogclient.db go build ./tlogdb newlog myname ./tlogdb publickey echo hello world | ./tlogdb add greeting ./tlogdb serve & ./tlogdb newcache $(./tlogdb publickey) ./tlogdb lookup greeting kill $!