1package dns

2

3import (

4 "net"

5)

6

7// IPDomain is an ip address, a domain, or empty.

8type IPDomain struct {

9 IP net.IP

10 Domain Domain

11}

12

13// IsZero returns if both IP and Domain are zero.

14func (d IPDomain) IsZero() bool {

15 return d.IP == nil && d.Domain == Domain{}

16}

17

18// String returns a string representation of either the IP or domain (with

19// UTF-8).

20func (d IPDomain) String() string {

21 if len(d.IP) > 0 {

22 return d.IP.String()

23 }

24 return d.Domain.Name()

25}

26

27// LogString returns a string with both ASCII-only and optional UTF-8

28// representation.

29func (d IPDomain) LogString() string {

30 if len(d.IP) > 0 {

31 return d.IP.String()

32 }

33 return d.Domain.LogString()

34}

35

36// XString is like String, but only returns UTF-8 domains if utf8 is true.

37func (d IPDomain) XString(utf8 bool) string {

38 if d.IsIP() {

39 // todo: check callers if this is valid syntax for them. should we add [] for ipv6? perhaps also ipv4? probably depends on context. in smtp, the syntax is [<ipv4>] and [IPv6:<ipv6>].

40 return d.IP.String()

41 }

42 return d.Domain.XName(utf8)

43}

44

45func (d IPDomain) IsIP() bool {

46 return len(d.IP) > 0

47}

48

49func (d IPDomain) IsDomain() bool {

50 return !d.Domain.IsZero()

51}

52