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Implement EDNS(0) Padding option code (#520) 

* Implement EDNS(0) Padding option code

* Fix EDNS0_PADDING.String
This commit is contained in:
Roland Bracewell Shoemaker 2017-09-21 05:50:49 -07:00 committed by Miek Gieben
parent e420576857
commit 689d334b01
2 changed files with 22 additions and 0 deletions
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15
edns.go
View File

@ -21,6 +21,7 @@ const (
EDNS0EXPIRE = 0x9 // EDNS0 expire
EDNS0COOKIE = 0xa // EDNS0 Cookie
EDNS0TCPKEEPALIVE = 0xb // EDNS0 tcp keep alive (RFC7828)
EDNS0PADDING = 0xc // EDNS0 padding (RFC7830)
EDNS0SUBNETDRAFT = 0x50fa // Don't use! Use EDNS0SUBNET
EDNS0LOCALSTART = 0xFDE9 // Beginning of range reserved for local/experimental use (RFC6891)
EDNS0LOCALEND = 0xFFFE // End of range reserved for local/experimental use (RFC6891)
@ -74,6 +75,8 @@ func (rr *OPT) String() string {
s += "\n; NSEC3 HASH UNDERSTOOD: " + o.String()
case *EDNS0_LOCAL:
s += "\n; LOCAL OPT: " + o.String()
case *EDNS0_PADDING:
s += "\n; PADDING: " + o.String()
}
}
return s
@ -595,3 +598,15 @@ func (e *EDNS0_TCP_KEEPALIVE) String() (s string) {
}
return
}
// EDNS0_PADDING option is used to add padding to a request/response. The default
// value of padding SHOULD be 0x0 but other values MAY be used, for instance if
// compression is applied before encryption which may break signatures.
type EDNS0_PADDING struct {
Padding []byte
}
func (e *EDNS0_PADDING) pack() ([]byte, error) { return e.Padding, nil }
func (e *EDNS0_PADDING) Option() uint16 { return EDNS0PADDING }
func (e *EDNS0_PADDING) unpack(b []byte) error { e.Padding = b; return nil }
func (e *EDNS0_PADDING) String() string { return fmt.Sprintf("%0X", e.Padding) }

7
msg_helpers.go
View File

@ -458,6 +458,13 @@ Option:
}
edns = append(edns, e)
off += int(optlen)
case EDNS0PADDING:
e := new(EDNS0_PADDING)
if err := e.unpack(msg[off : off+int(optlen)]); err != nil {
return nil, len(msg), err
}
edns = append(edns, e)
off += int(optlen)
default:
e := new(EDNS0_LOCAL)
e.Code = code