package dns

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Module Dns.TsigSource

Transaction signature

A transaction signature is a resource record that authenticates a DNS packet. Its nature is not to persist in databases, but it is handled specially during decoding and encoding.

Sourcetype algorithm =
  1. | SHA1
  2. | SHA224
  3. | SHA256
  4. | SHA384
  5. | SHA512
    (*

    The type of supported signature algorithms.

    *)
Sourceval algorithm_to_name : algorithm -> [ `host ] Domain_name.t

algorithm_to_name a is the hostname of the algorithm.

Sourceval algorithm_of_name : ?off:int -> [ `host ] Domain_name.t -> (algorithm, [> `Not_implemented of int * string ]) result

algorithm_of_name ~off name is the algorithm represented by name, or an Error if no such algorithm exist.

Sourceval pp_algorithm : algorithm Fmt.t

pp_algorithm ppf a pretty-prints the algorithm a on ppf.

Sourcetype t = private {
  1. algorithm : algorithm;
  2. signed : Ptime.t;
  3. fudge : Ptime.Span.t;
  4. mac : string;
  5. original_id : int;
  6. error : Rcode.t;
  7. other : Ptime.t option;
}

The type of a transaction signature: algorithm, timestamp when it was signed, the span it is valid for, the actual signature (mac), the original DNS identifier, a potential error, and optionally the other timestamp (used to signal non-synchronized clocks).

Sourceval tsig : algorithm:algorithm -> signed:Ptime.t -> ?fudge:Ptime.span -> ?mac:string -> ?original_id:int -> ?error:Rcode.t -> ?other:Ptime.t -> unit -> t option

tsig ~algorithm ~signed ~fudge ~mac ~original_id ~error ~other () constructs a transaction signature t if possible (timestamp needs to fit into 48 bit as seconds since Unix epoch).

Sourceval with_mac : t -> string -> t

with_mac t mac updates t with mac.

Sourceval with_error : t -> Rcode.t -> t

with_error t err updates t with err.

Sourceval with_signed : t -> Ptime.t -> t option

with_signed t ts updates t with signed timestamp ts, if ts fits in the representation (seconds since Unix epoch in 48 bit).

Sourceval with_other : t -> Ptime.t option -> t option

with_other t ts updates t with other timestamp ts, if ts fits in the representation (seconds since Unix epoch in 48 bit).

Sourceval pp : t Fmt.t

pp ppf t pretty-prints the transaction signature t on ppf.

Sourceval equal : t -> t -> bool

equal a b compares the transaction signature a with b, and is true if they are equal, false otherwise.

Sourceval encode_raw : [ `raw ] Domain_name.t -> t -> string

encode_raw name t encodes the transaction signature t as resource record using name. The mac is not included, this is used for computing the signature.

Sourceval encode_full : [ `raw ] Domain_name.t -> t -> string

encode_full name t encodes the transaction signature t as resource record using name.

Sourceval dnskey_to_tsig_algo : Dnskey.t -> (algorithm, [> `Msg of string ]) result

dnskey_to_tsig_algo dnskey is the TSIG algorithm of dnskey, or an Error.

Sourceval valid_time : Ptime.t -> t -> bool

valid_time ts t checks whether the signed timestamp (within fudge) matches ts.