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https://github.com/etcd-io/etcd.git
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705ec45083
etcd resolves DNS hostnames to IP addresses for client and peer URLs
before creating any listening sockets.
The following messages are logged during startup:
etcd: Resolving infra0.coreos.com:2380 to 10.0.1.10:2380
Fixes #1991
58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
/*
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Copyright 2014 CoreOS, Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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package netutil
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import (
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"log"
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"net"
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"net/url"
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)
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var (
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// indirection for testing
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resolveTCPAddr = net.ResolveTCPAddr
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)
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// ResolveTCPAddrs is a convenience wrapper for net.ResolveTCPAddr.
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// ResolveTCPAddrs resolves all DNS hostnames in-place for the given set of
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// url.URLs.
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func ResolveTCPAddrs(urls ...[]url.URL) error {
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for _, us := range urls {
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for i, u := range us {
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host, _, err := net.SplitHostPort(u.Host)
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if err != nil {
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log.Printf("netutil: Could not parse url %s during tcp resolving.", u.Host)
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return err
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}
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if host == "localhost" {
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continue
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}
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if net.ParseIP(host) != nil {
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continue
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}
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tcpAddr, err := resolveTCPAddr("tcp", u.Host)
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if err != nil {
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log.Printf("netutil: Could not resolve host: %s", u.Host)
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return err
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}
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log.Printf("netutil: Resolving %s to %s", u.Host, tcpAddr.String())
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us[i].Host = tcpAddr.String()
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}
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}
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return nil
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}
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