Module pre_startup 

PostgreSQL’s untagged pre-startup protocol.

These packets precede normal message framing. Encryption acceptance is a raw byte, and a successful negotiation changes the connection’s transport type.

Structs

InvalidEncryptionReply

A raw encryption decision byte other than S, N, or legacy E.

SslStrategy

Actions needed to apply an SslMode across connection attempts.

Enums

AwaitingGssReply

Client role awaits the server’s raw GSS encryption decision byte.

AwaitingSslReply

Client role awaits the server’s raw SSL decision byte.

CertificateVerification

Peer-certificate checks required by an SSL mode.

EncryptionReply

The server’s single-byte answer to an SSL request.

GssHandshake

GSS encryption was accepted and the transport must complete its handshake.

Negotiation

A reply whose branches deliberately have different typestates.

PreStartup

Connection awaits the client’s first untagged startup-family packet.

PreStartupMessage

The external choice occupying a new connection’s untagged first packet.

PreStartupOffer

Server-role projection of the client’s first-packet external choice.

ServerGssDecision

Server role must accept or reject a client’s GSSENCRequest.

ServerSslDecision

Server role must accept or reject a client’s SSLRequest.

SslMode

libpq-compatible TLS negotiation policy.

SslModeNegotiation

SSL negotiation after applying plaintext-fallback policy.

Startup

A decoded StartupMessage is ready for protocol validation.

Terminated

Pre-startup processing terminated without entering a normal session.

TlsHandshake

SSL was accepted and the transport must complete a TLS handshake.

Constants

DEFAULT_MAX_PRE_STARTUP_PACKET_LEN

PostgreSQL’s maximum accepted untagged startup packet size.

Functions

decode_pre_startup

Incrementally decodes one raw pre-startup packet without consuming partial input.

decode_pre_startup_with_limit

Incrementally decodes one raw pre-startup packet with an allocation bound.