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Add option to use custom DNS server for client

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This is useful for systems like Android which doesn't follow
normal DNS conventions like /etc/resolv.conf, so normal golang
DNS (ie when CGO_ENABLED=0) fails on Android.
This commit is contained in:
Anders Pitman 2020-11-27 21:31:32 -07:00
parent 738a637385
commit d09391cc75
1 changed files with 13 additions and 0 deletions
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13
client.go
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@ -40,8 +40,21 @@ func NewBoringProxyClient() *BoringProxyClient {
name := flagSet.String("client-name", "", "Client name")
user := flagSet.String("user", "admin", "user")
certDir := flagSet.String("cert-dir", "", "TLS cert directory")
dnsServer := flagSet.String("dns-server", "", "Custom DNS server")
flagSet.Parse(os.Args[2:])
if *dnsServer != "" {
net.DefaultResolver = &net.Resolver{
PreferGo: true,
Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
d := net.Dialer{
Timeout: time.Millisecond * time.Duration(10000),
}
return d.DialContext(ctx, "udp", fmt.Sprintf("%s:53", *dnsServer))
},
}
}
certmagic.DefaultACME.DisableHTTPChallenge = true
if *certDir != "" {