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Name	Size	Permission
.github	[ DIR ]	dr-xr-xr-x
dnsutil	[ DIR ]	dr-xr-xr-x
.codecov.yml	128 B	-r--r--r--
.gitignore	24 B	-r--r--r--
AUTHORS	27 B	-r--r--r--
CODEOWNERS	18 B	-r--r--r--
CONTRIBUTORS	150 B	-r--r--r--
COPYRIGHT	512 B	-r--r--r--
LICENSE	1.58 KB	-r--r--r--
Makefile.fuzz	671 B	-r--r--r--
Makefile.release	992 B	-r--r--r--
README.md	5.83 KB	-r--r--r--
acceptfunc.go	1.83 KB	-r--r--r--
acceptfunc_test.go	859 B	-r--r--r--
client.go	13.88 KB	-r--r--r--
client_test.go	16.25 KB	-r--r--r--
clientconfig.go	3.3 KB	-r--r--r--
clientconfig_test.go	4.63 KB	-r--r--r--
dane.go	997 B	-r--r--r--
defaults.go	10.3 KB	-r--r--r--
dns.go	4.34 KB	-r--r--r--
dns_bench_test.go	9.42 KB	-r--r--r--
dns_test.go	9.95 KB	-r--r--r--
dnssec.go	18.32 KB	-r--r--r--
dnssec_keygen.go	3.1 KB	-r--r--r--
dnssec_keyscan.go	6.16 KB	-r--r--r--
dnssec_privkey.go	2.27 KB	-r--r--r--
dnssec_test.go	28.57 KB	-r--r--r--
doc.go	10.54 KB	-r--r--r--
duplicate.go	953 B	-r--r--r--
duplicate_generate.go	3.95 KB	-r--r--r--
duplicate_test.go	3.77 KB	-r--r--r--
dyn_test.go	37 B	-r--r--r--
edns.go	19.69 KB	-r--r--r--
edns_test.go	3.09 KB	-r--r--r--
example_test.go	3.12 KB	-r--r--r--
format.go	2.4 KB	-r--r--r--
format_test.go	279 B	-r--r--r--
fuzz.go	536 B	-r--r--r--
fuzz_test.go	7.54 KB	-r--r--r--
generate.go	4.97 KB	-r--r--r--
generate_test.go	6.93 KB	-r--r--r--
go.mod	210 B	-r--r--r--
go.sum	1 KB	-r--r--r--
issue_test.go	1.19 KB	-r--r--r--
labels.go	4.11 KB	-r--r--r--
labels_test.go	7.88 KB	-r--r--r--
leak_test.go	1.81 KB	-r--r--r--
length_test.go	20.49 KB	-r--r--r--
listen_go111.go	881 B	-r--r--r--
listen_go_not111.go	485 B	-r--r--r--
msg.go	31.99 KB	-r--r--r--
msg_generate.go	10.22 KB	-r--r--r--
msg_helpers.go	21.54 KB	-r--r--r--
msg_helpers_test.go	11.86 KB	-r--r--r--
msg_test.go	9.12 KB	-r--r--r--
msg_truncate.go	3.4 KB	-r--r--r--
msg_truncate_test.go	5 KB	-r--r--r--
nsecx.go	2.38 KB	-r--r--r--
nsecx_test.go	4.77 KB	-r--r--r--
parse_test.go	65.88 KB	-r--r--r--
privaterr.go	3.23 KB	-r--r--r--
privaterr_test.go	3.51 KB	-r--r--r--
reverse.go	1.32 KB	-r--r--r--
rr_test.go	191 B	-r--r--r--
sanitize.go	1.98 KB	-r--r--r--
sanitize_test.go	2 KB	-r--r--r--
scan.go	29.12 KB	-r--r--r--
scan_rr.go	40.59 KB	-r--r--r--
scan_test.go	8.88 KB	-r--r--r--
serve_mux.go	3.37 KB	-r--r--r--
serve_mux_test.go	1.63 KB	-r--r--r--
server.go	21.53 KB	-r--r--r--
server_test.go	31.38 KB	-r--r--r--
sig0.go	4.59 KB	-r--r--r--
sig0_test.go	2.23 KB	-r--r--r--
singleinflight.go	1.56 KB	-r--r--r--
smimea.go	1.33 KB	-r--r--r--
svcb.go	19.95 KB	-r--r--r--
svcb_test.go	2.48 KB	-r--r--r--
tlsa.go	1.1 KB	-r--r--r--
tsig.go	10.98 KB	-r--r--r--
tsig_test.go	10.75 KB	-r--r--r--
types.go	36.03 KB	-r--r--r--
types_generate.go	8.63 KB	-r--r--r--
types_test.go	4.31 KB	-r--r--r--
udp.go	2.9 KB	-r--r--r--
udp_test.go	4.41 KB	-r--r--r--
udp_windows.go	1.15 KB	-r--r--r--
update.go	3.08 KB	-r--r--r--
update_test.go	4.38 KB	-r--r--r--
version.go	275 B	-r--r--r--
version_test.go	180 B	-r--r--r--
xfr.go	6.57 KB	-r--r--r--
xfr_test.go	2.72 KB	-r--r--r--
zduplicate.go	20.23 KB	-r--r--r--
zmsg.go	59.75 KB	-r--r--r--
ztypes.go	29.52 KB	-r--r--r--

Code Editor : dns.go

package dns

import (
	"encoding/hex"
	"strconv"
)

const (
	year68     = 1 << 31 // For RFC1982 (Serial Arithmetic) calculations in 32 bits.
	defaultTtl = 3600    // Default internal TTL.

// DefaultMsgSize is the standard default for messages larger than 512 bytes.
	DefaultMsgSize = 4096
	// MinMsgSize is the minimal size of a DNS packet.
	MinMsgSize = 512
	// MaxMsgSize is the largest possible DNS packet.
	MaxMsgSize = 65535
)

// Error represents a DNS error.
type Error struct{ err string }

func (e *Error) Error() string {
	if e == nil {
		return "dns: <nil>"
	}
	return "dns: " + e.err
}

// An RR represents a resource record.
type RR interface {
	// Header returns the header of an resource record. The header contains
	// everything up to the rdata.
	Header() *RR_Header
	// String returns the text representation of the resource record.
	String() string

// copy returns a copy of the RR
	copy() RR

// len returns the length (in octets) of the compressed or uncompressed RR in wire format.
	//
	// If compression is nil, the uncompressed size will be returned, otherwise the compressed
	// size will be returned and domain names will be added to the map for future compression.
	len(off int, compression map[string]struct{}) int

// pack packs the records RDATA into wire format. The header will
	// already have been packed into msg.
	pack(msg []byte, off int, compression compressionMap, compress bool) (off1 int, err error)

// unpack unpacks an RR from wire format.
	//
	// This will only be called on a new and empty RR type with only the header populated. It
	// will only be called if the record's RDATA is non-empty.
	unpack(msg []byte, off int) (off1 int, err error)

// parse parses an RR from zone file format.
	//
	// This will only be called on a new and empty RR type with only the header populated.
	parse(c *zlexer, origin string) *ParseError

// isDuplicate returns whether the two RRs are duplicates.
	isDuplicate(r2 RR) bool
}

// RR_Header is the header all DNS resource records share.
type RR_Header struct {
	Name     string `dns:"cdomain-name"`
	Rrtype   uint16
	Class    uint16
	Ttl      uint32
	Rdlength uint16 // Length of data after header.
}

// Header returns itself. This is here to make RR_Header implements the RR interface.
func (h *RR_Header) Header() *RR_Header { return h }

// Just to implement the RR interface.
func (h *RR_Header) copy() RR { return nil }

func (h *RR_Header) String() string {
	var s string

if h.Rrtype == TypeOPT {
		s = ";"
		// and maybe other things
	}

s += sprintName(h.Name) + "\t"
	s += strconv.FormatInt(int64(h.Ttl), 10) + "\t"
	s += Class(h.Class).String() + "\t"
	s += Type(h.Rrtype).String() + "\t"
	return s
}

func (h *RR_Header) len(off int, compression map[string]struct{}) int {
	l := domainNameLen(h.Name, off, compression, true)
	l += 10 // rrtype(2) + class(2) + ttl(4) + rdlength(2)
	return l
}

func (h *RR_Header) pack(msg []byte, off int, compression compressionMap, compress bool) (off1 int, err error) {
	// RR_Header has no RDATA to pack.
	return off, nil
}

func (h *RR_Header) unpack(msg []byte, off int) (int, error) {
	panic("dns: internal error: unpack should never be called on RR_Header")
}

func (h *RR_Header) parse(c *zlexer, origin string) *ParseError {
	panic("dns: internal error: parse should never be called on RR_Header")
}

// 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))
	headerEnd, off, err := packRR(r, buf, 0, compressionMap{}, false)
	if err != nil {
		return err
	}
	buf = buf[:off]

*rr = RFC3597{Hdr: *r.Header()}
	rr.Hdr.Rdlength = uint16(off - headerEnd)

if noRdata(rr.Hdr) {
		return nil
	}

_, 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
	}

_, err = r.unpack(msg, 0)
	return err
}

${this.title}

Code Editor : dns.go