Enum TlsNegotiationMode 

#[non_exhaustive]
pub enum TlsNegotiationMode {
    PostPreLogin,
    Strict,
}

TDS TLS negotiation mode.

This determines when TLS handshake occurs relative to TDS protocol messages.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

PostPreLogin

TDS 7.x style: TLS handshake occurs after PreLogin exchange.

TCP Connect → PreLogin (cleartext) → TLS Handshake → Login7 (encrypted)

This is the default for SQL Server 2019 and earlier, and for SQL Server 2022+ when Encrypt=true (not strict).

Strict

TDS 8.0 strict mode: TLS handshake occurs immediately after TCP connect.

TCP Connect → TLS Handshake → PreLogin (encrypted) → Login7 (encrypted)

This is required for SQL Server 2022+ when Encrypt=strict is set. All TDS traffic is encrypted, including the PreLogin packet.

Implementations

impl TlsNegotiationMode

pub fn is_tls_first(&self) -> bool

Check if this mode requires TLS before any TDS traffic.

pub fn prelogin_encrypted(&self) -> bool

Check if PreLogin is sent in cleartext.

pub fn from_encrypt_mode(encrypt_strict: bool) -> Self

Get the mode from encryption settings.

Arguments

• encrypt_strict - Whether Encrypt=strict is set (TDS 8.0)

Trait Implementations

impl Clone for TlsNegotiationMode

fn clone(&self) -> TlsNegotiationMode

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TlsNegotiationMode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Hash for TlsNegotiationMode

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for TlsNegotiationMode

fn eq(&self, other: &TlsNegotiationMode) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for TlsNegotiationMode

impl Eq for TlsNegotiationMode

impl StructuralPartialEq for TlsNegotiationMode