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always use full Service Instance Name

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Service instance name is defined in RFC6763 section 4.1 as
  Service Instance Name = <Instance> . <Service> . <Domain>
Use it instead of <Instance> . <Domain> for consistency.
This commit is contained in:
Benoît Ganne 2020-12-08 12:14:20 +01:00 committed by Jordan Whited
parent fd4b7d8879
commit 401ad4ea47
3 changed files with 17 additions and 17 deletions
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8
README.md
View File

@ -74,12 +74,12 @@ _wireguard._udp.example.com. 0 IN PTR yutrled535igkl7bdlerl6m4vjxsxm3uqqpl4nmsn2
_wireguard._udp.example.com. 0 IN PTR wmrid55v4enhxqx2jstyoyvkicj5pihkb2tr7r42smiu3t5l4i5q====._wireguard._udp.example.com.
$
$ dig @127.0.0.1 -p 5353 yutrled535igkl7bdlerl6m4vjxsxm3uqqpl4nmsn27mt56ad4ha====._wireguard._udp.example.com. SRV +noall +answer +additional
yutrled535igkl7bdlerl6m4vjxsxm3uqqpl4nmsn27mt56ad4ha====._wireguard._udp.example.com. 0 IN SRV 0 0 7777 yutrled535igkl7bdlerl6m4vjxsxm3uqqpl4nmsn27mt56ad4ha====.example.com.
yutrled535igkl7bdlerl6m4vjxsxm3uqqpl4nmsn27mt56ad4ha====.example.com. 0 IN A 203.0.113.1
yutrled535igkl7bdlerl6m4vjxsxm3uqqpl4nmsn27mt56ad4ha====._wireguard._udp.example.com. 0 IN SRV 0 0 7777 yutrled535igkl7bdlerl6m4vjxsxm3uqqpl4nmsn27mt56ad4ha====._wireguard._udp.example.com.
yutrled535igkl7bdlerl6m4vjxsxm3uqqpl4nmsn27mt56ad4ha====._wireguard._udp.example.com. 0 IN A 203.0.113.1
$
$ dig @127.0.0.1 -p 5353 wmrid55v4enhxqx2jstyoyvkicj5pihkb2tr7r42smiu3t5l4i5q====._wireguard._udp.example.com. SRV +noall +answer +additional
wmrid55v4enhxqx2jstyoyvkicj5pihkb2tr7r42smiu3t5l4i5q====._wireguard._udp.example.com. 0 IN SRV 0 0 8888 wmrid55v4enhxqx2jstyoyvkicj5pihkb2tr7r42smiu3t5l4i5q====.example.com.
wmrid55v4enhxqx2jstyoyvkicj5pihkb2tr7r42smiu3t5l4i5q====.example.com. 0 IN A 198.51.100.1
wmrid55v4enhxqx2jstyoyvkicj5pihkb2tr7r42smiu3t5l4i5q====._wireguard._udp.example.com. 0 IN SRV 0 0 8888 wmrid55v4enhxqx2jstyoyvkicj5pihkb2tr7r42smiu3t5l4i5q====._wireguard._udp.example.com.
wmrid55v4enhxqx2jstyoyvkicj5pihkb2tr7r42smiu3t5l4i5q====._wireguard._udp.example.com. 0 IN A 198.51.100.1
```
Converting public keys to Base64 with coreutils:

10
wgsd.go
View File

@ -37,7 +37,8 @@ type wgctrlClient interface {
const (
keyLen = 56 // the number of characters in a base32-encoded Wireguard public key
spPrefix = "_wireguard._udp."
serviceInstanceLen = keyLen + len(".") + len(spPrefix)
spSubPrefix = "." + spPrefix
serviceInstanceLen = keyLen + len(spSubPrefix)
)
func (p *WGSD) ServeDNS(ctx context.Context, w dns.ResponseWriter,
@ -114,15 +115,14 @@ func (p *WGSD) ServeDNS(ctx context.Context, w dns.ResponseWriter,
Priority: 0,
Weight: 0,
Port: uint16(endpoint.Port),
Target: fmt.Sprintf("%s.%s",
strings.ToLower(pubKey), p.zone),
Target: strings.ToLower(pubKey) + spSubPrefix + p.zone,
})
w.WriteMsg(m) // nolint: errcheck
return dns.RcodeSuccess, nil
}
}
return nxDomain(p.zone, w, r)
case len(name) == keyLen+1 && (qtype == dns.TypeA ||
case len(name) == len(spSubPrefix)+keyLen && (qtype == dns.TypeA ||
qtype == dns.TypeAAAA):
pubKey := name[:keyLen]
for _, peer := range device.Peers {
@ -148,7 +148,7 @@ func getHostRR(pubKey, zone string, endpoint *net.UDPAddr) dns.RR {
if endpoint == nil || endpoint.IP == nil {
return nil
}
name := fmt.Sprintf("%s.%s", strings.ToLower(pubKey), zone)
name := strings.ToLower(pubKey) + spSubPrefix + zone
switch {
case endpoint.IP.To4() != nil:
return &dns.A{

16
wgsd_test.go
View File

@ -70,10 +70,10 @@ func TestWGSD(t *testing.T) {
Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SRV(fmt.Sprintf("%s._wireguard._udp.example.com. 0 IN SRV 0 0 1 %s.example.com.", peer1b32, peer1b32)),
test.SRV(fmt.Sprintf("%s._wireguard._udp.example.com. 0 IN SRV 0 0 1 %s._wireguard._udp.example.com.", peer1b32, peer1b32)),
},
Extra: []dns.RR{
test.A(fmt.Sprintf("%s.example.com. 0 IN A %s", peer1b32, peer1.Endpoint.IP.String())),
test.A(fmt.Sprintf("%s._wireguard._udp.example.com. 0 IN A %s", peer1b32, peer1.Endpoint.IP.String())),
},
},
{
@ -81,26 +81,26 @@ func TestWGSD(t *testing.T) {
Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SRV(fmt.Sprintf("%s._wireguard._udp.example.com. 0 IN SRV 0 0 2 %s.example.com.", peer2b32, peer2b32)),
test.SRV(fmt.Sprintf("%s._wireguard._udp.example.com. 0 IN SRV 0 0 2 %s._wireguard._udp.example.com.", peer2b32, peer2b32)),
},
Extra: []dns.RR{
test.AAAA(fmt.Sprintf("%s.example.com. 0 IN AAAA %s", peer2b32, peer2.Endpoint.IP.String())),
test.AAAA(fmt.Sprintf("%s._wireguard._udp.example.com. 0 IN AAAA %s", peer2b32, peer2.Endpoint.IP.String())),
},
},
{
Qname: fmt.Sprintf("%s.example.com.", peer1b32),
Qname: fmt.Sprintf("%s._wireguard._udp.example.com.", peer1b32),
Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A(fmt.Sprintf("%s.example.com. 0 IN A %s", peer1b32, peer1.Endpoint.IP.String())),
test.A(fmt.Sprintf("%s._wireguard._udp.example.com. 0 IN A %s", peer1b32, peer1.Endpoint.IP.String())),
},
},
{
Qname: fmt.Sprintf("%s.example.com.", peer2b32),
Qname: fmt.Sprintf("%s._wireguard._udp.example.com.", peer2b32),
Qtype: dns.TypeAAAA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.AAAA(fmt.Sprintf("%s.example.com. 0 IN AAAA %s", peer2b32, peer2.Endpoint.IP.String())),
test.AAAA(fmt.Sprintf("%s._wireguard._udp.example.com. 0 IN AAAA %s", peer2b32, peer2.Endpoint.IP.String())),
},
},
{