A proxy to sniff postgres wire protocol traffic.

pgroxy sits between a client and a postgres server. It copies data between the client and the server while decoding the passing protocol packets and dumping them on stdout.

+--------+       +--------+        +----------+
| client | <---> | pgroxy |  <---> | postgres |
+--------+       +--------+        +----------+
                     |
                     V
                 +--------+
                 | stdout |
                 +--------+

pgroxy needs both a listen address and an upstream address. E.g. to listen on port 8080 and connect to a postgres server at 5432 run the following:

cargo run -- --listen localhost:8080 --connect localhost:5432

With this pgroxy will start listening on localhost:8080. Now connect your Postgres client to localhost:8080 instead of localhost:5432 to observe the Postgres wire protocol messages.

(from https://www.postgresql.org/docs/current/protocol-message-formats.html):

• AuthenticationOk
• AuthenticationKerberosV5
• AuthenticationCleartextPassword
• AuthenticationMD5Password
• AuthenticationGSS
• AuthenticationGSSContinue
• AuthenticationSSPI
• AuthenticationSASL
• AuthenticationSASLContinue
• AuthenticationSASLFinal
• BackendKeyData
• Bind
• BindComplete
• CancelRequest
• Close
• CloseComplete
• CommandComplete
• CopyData
• CopyDone
• CopyFail
• CopyInResponse
• CopyOutResponse
• CopyBothResponse
• DataRow
• Describe
• EmptyQueryResponse
• ErrorResponse
• Execute
• Flush
• FunctionCall
• FunctionCallResponse
• GSSENCRequest
• GSSResponse
• NegotiateProtocolVersion
• NoData
• NoticeResponse
• NotificationResponse
• ParameterDescription
• ParameterStatus
• Parse
• ParseComplete
• PasswordMessage
• PortalSuspended
• Query
• ReadyForQuery
• RowDescription
• SASLInitialResponse
• SASLResponse
• SSLRequest
• StartupMessage
• Sync
• Terminate