mirror of https://github.com/kubernetes/kops.git
69 lines
2.0 KiB
Go
69 lines
2.0 KiB
Go
/*
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Copyright 2020 The Kubernetes Authors.
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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 util
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import (
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"bytes"
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"fmt"
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"log"
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"net"
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"strings"
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"time"
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)
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const externalIPMetadataURL = "http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/0/access-configs/0/external-ip"
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var externalIPServiceURLs = []string{
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"https://ip.jsb.workers.dev",
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"https://v4.ifconfig.co",
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}
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// ExternalIPRange returns the CIDR block for the public IP
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// in front of the kubetest2 client
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func ExternalIPRange() (string, error) {
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var b bytes.Buffer
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err := HTTPGETWithHeaders(externalIPMetadataURL, map[string]string{"Metadata-Flavor": "Google"}, &b)
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if err != nil {
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// This often fails due to workload identity
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log.Printf("failed to get external ip from metadata service: %v", err)
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} else if ip := net.ParseIP(strings.TrimSpace(b.String())); ip != nil {
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return ip.String() + "/32", nil
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} else {
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log.Printf("metadata service returned invalid ip %q", b.String())
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}
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for attempt := 0; attempt < 5; attempt++ {
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for _, u := range externalIPServiceURLs {
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b.Reset()
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err = HTTPGETWithHeaders(u, nil, &b)
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if err != nil {
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// The external service may well be down
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log.Printf("failed to get external ip from %s: %v", u, err)
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} else if ip := net.ParseIP(strings.TrimSpace(b.String())); ip != nil {
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return ip.String() + "/32", nil
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} else {
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log.Printf("service %s returned invalid ip %q", u, b.String())
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}
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}
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time.Sleep(2 * time.Second)
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}
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return "", fmt.Errorf("external IP cannot be retrieved")
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}
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