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Support for an additional EDNS client subnet for AAAA queries #21

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Support for an additional EDNS client subnet for AAAA queries #21

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efd81c9
add support for an additional EDNS client subnet for AAAA queries
denisu Dec 7, 2016
c66b570
update Readme for edns6 support
denisu Dec 7, 2016
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2 changes: 2 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,8 @@ Usage of dingo-linux-amd64:
Google DNS: try to lookup the closest IPv4 server
-gdns:edns string
Google DNS: EDNS client subnet (set 0.0.0.0/0 to disable)
-gdns:edns6 string
Google DNS: Optional IPv6 EDNS client subnet for AAAA queries
-gdns:host string
Google DNS: HTTP 'Host' header (real FQDN, encrypted in TLS) (default "dns.google.com")
-gdns:nopad
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9 changes: 8 additions & 1 deletion gdns.go
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Expand Up @@ -23,6 +23,7 @@ type Gdns struct {
sni *string
host *string
edns *string
edns6 *string
nopad *bool
}

Expand All @@ -40,6 +41,8 @@ func (r *Gdns) Init() {
"Google DNS: HTTP 'Host' header (real FQDN, encrypted in TLS)")
r.edns = flag.String("gdns:edns", "",
"Google DNS: EDNS client subnet (set 0.0.0.0/0 to disable)")
r.edns6 = flag.String("gdns:edns6", "",
"Google DNS: Optional IPv6 EDNS client subnet for AAAA queries")
r.nopad = flag.Bool("gdns:nopad", false,
"Google DNS: disable random padding")
}
Expand Down Expand Up @@ -76,9 +79,13 @@ func (R *Gdns) resolve(https *Https, server string, qname string, qtype int) *Re
/* prepare */
v.Set("name", qname)
v.Set("type", fmt.Sprintf("%d", qtype))
if len(*R.edns) > 0 {

if (qtype == 28 && len(*R.edns6) > 0) {
v.Set("edns_client_subnet", *R.edns6)
} else if (len(*R.edns) > 0) {
v.Set("edns_client_subnet", *R.edns)
}

if !*R.nopad {
v.Set("random_padding", strings.Repeat(string(65+rand.Intn(26)), rand.Intn(500)))
}
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