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55 lines
1.4 KiB
Go
55 lines
1.4 KiB
Go
// +build go1.9
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/*
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*
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* Copyright 2018 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package dns
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import (
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"net"
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"golang.org/x/net/context"
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)
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var (
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defaultResolver netResolver = net.DefaultResolver
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)
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const defaultDNSSvrPort = "53"
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var customAuthorityDialler = func(authority string) func(ctx context.Context, network, address string) (net.Conn, error) {
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return func(ctx context.Context, network, address string) (net.Conn, error) {
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var dialer net.Dialer
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return dialer.DialContext(ctx, network, authority)
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}
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}
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var customAuthorityResolver = func(authority string) (netResolver, error) {
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host, port, err := parseTarget(authority, defaultDNSSvrPort)
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if err != nil {
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return nil, err
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}
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authorityWithPort := net.JoinHostPort(host, port)
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return &net.Resolver{
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PreferGo: true,
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Dial: customAuthorityDialler(authorityWithPort),
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}, nil
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}
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