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Google DNS: try to lookup the closest IPv6 server #32

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Google DNS: try to lookup the closest IPv6 server #32

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c8f41b1
Google DNS: try to lookup the closest IPv6 server
Opensourcecommunitydevelopment Jul 31, 2017
f263039
Update README.md
Opensourcecommunitydevelopment Jul 31, 2017
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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 @@ -50,6 +50,8 @@ Usage of dingo-linux-amd64:
debugging level (default 2)
-gdns:auto
Google DNS: try to lookup the closest IPv4 server
-gdns:auto6
Google DNS: try to lookup the closest IPv6 server
-gdns:edns string
Google DNS: EDNS client subnet (set 0.0.0.0/0 to disable)
-gdns:host string
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10 changes: 10 additions & 0 deletions gdns.go
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Expand Up @@ -20,6 +20,7 @@ type Gdns struct {
workers *int
server *string
auto *bool
auto6 *bool
sni *string
host *string
edns *string
Expand All @@ -34,6 +35,8 @@ func (r *Gdns) Init() {
"Google DNS: server address")
r.auto = flag.Bool("gdns:auto", false,
"Google DNS: try to lookup the closest IPv4 server")
r.auto6 = flag.Bool("gdns:auto6", false,
"Google DNS: try to lookup the closest IPv6 server")
r.sni = flag.String("gdns:sni", "www.google.com",
"Google DNS: SNI string to send (should match server certificate)")
r.host = flag.String("gdns:host", "dns.google.com",
Expand All @@ -56,6 +59,13 @@ func (R *Gdns) Start() {
R.server = &r4.Answer[0].Data
}
}
if *R.auto6 {
dbg(1, "resolving dns.google.com...")
r6 := R.resolve(NewHttps(*R.sni, false), *R.server, "dns.google.com", 28)
if r6.Status == 0 && len(r6.Answer) > 0 {
R.server = &r6.Answer[0].Data
}
}

dbg(1, "starting %d Google Public DNS client(s) querying server %s",
*R.workers, *R.server)
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