diff options
Diffstat (limited to 'vendor/github.com/miekg/dns/dns.go')
| -rw-r--r-- | vendor/github.com/miekg/dns/dns.go | 30 |
1 files changed, 27 insertions, 3 deletions
diff --git a/vendor/github.com/miekg/dns/dns.go b/vendor/github.com/miekg/dns/dns.go index ad83a27ecf..a88484b062 100644 --- a/vendor/github.com/miekg/dns/dns.go +++ b/vendor/github.com/miekg/dns/dns.go @@ -1,6 +1,9 @@ package dns -import "strconv" +import ( + "encoding/hex" + "strconv" +) const ( year68 = 1 << 31 // For RFC1982 (Serial Arithmetic) calculations in 32 bits. @@ -111,7 +114,7 @@ func (h *RR_Header) parse(c *zlexer, origin string) *ParseError { // ToRFC3597 converts a known RR to the unknown RR representation from RFC 3597. func (rr *RFC3597) ToRFC3597(r RR) error { - buf := make([]byte, Len(r)*2) + buf := make([]byte, Len(r)) headerEnd, off, err := packRR(r, buf, 0, compressionMap{}, false) if err != nil { return err @@ -126,9 +129,30 @@ func (rr *RFC3597) ToRFC3597(r RR) error { } _, err = rr.unpack(buf, headerEnd) + return err +} + +// fromRFC3597 converts an unknown RR representation from RFC 3597 to the known RR type. +func (rr *RFC3597) fromRFC3597(r RR) error { + hdr := r.Header() + *hdr = rr.Hdr + + // Can't overflow uint16 as the length of Rdata is validated in (*RFC3597).parse. + // We can only get here when rr was constructed with that method. + hdr.Rdlength = uint16(hex.DecodedLen(len(rr.Rdata))) + + if noRdata(*hdr) { + // Dynamic update. + return nil + } + + // rr.pack requires an extra allocation and a copy so we just decode Rdata + // manually, it's simpler anyway. + msg, err := hex.DecodeString(rr.Rdata) if err != nil { return err } - return nil + _, err = r.unpack(msg, 0) + return err } |