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Extra doc for DNS Cookies

This commit is contained in:
Miek Gieben 2016-06-11 09:37:01 +01:00
parent ee126a9f10
commit e048e89b44
1 changed files with 9 additions and 2 deletions
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11
edns.go
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@ -132,8 +132,7 @@ func (rr *OPT) SetDo() {
rr.Hdr.Ttl |= _DO
}
// EDNS0 defines an EDNS0 Option. An OPT RR can have multiple options appended to
// it.
// EDNS0 defines an EDNS0 Option. An OPT RR can have multiple options appended to it.
type EDNS0 interface {
// Option returns the option code for the option.
Option() uint16
@ -300,6 +299,14 @@ func (e *EDNS0_SUBNET) String() (s string) {
// e.Cookie = "24a5ac.."
// o.Option = append(o.Option, e)
//
// The Cookie field consists out of a client cookie (RFC 7873 Section 4), that is
// always 8 bytes. It may then optionally be followed by the server cookie. The server
// cookie is of variable length, 8 to a maximum of 32 bytes. In other words:
//
// cCookie := o.Cookie[:16]
// sCookie := o.Cookie[16:]
//
// There is no guarantee that the Cookie string has a specific length.
type EDNS0_COOKIE struct {
Code uint16 // Always EDNS0COOKIE
Cookie string // Hex-encoded cookie data