mirror of https://github.com/kubernetes/kops.git
83 lines
2.8 KiB
Go
83 lines
2.8 KiB
Go
/*
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Copyright 2023 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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"fmt"
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"net"
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"strings"
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"k8s.io/klog/v2"
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netutils "k8s.io/utils/net"
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)
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const (
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cloudProviderNone = ""
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cloudProviderExternal = "external"
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)
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// parseNodeIP implements ParseNodeIPArgument and ParseNodeIPAnnotation
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func parseNodeIP(nodeIP string, allowDual, sloppy bool) ([]net.IP, error) {
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var nodeIPs []net.IP
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if nodeIP != "" || !sloppy {
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for _, ip := range strings.Split(nodeIP, ",") {
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if sloppy {
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ip = strings.TrimSpace(ip)
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}
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parsedNodeIP := netutils.ParseIPSloppy(ip)
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if parsedNodeIP == nil {
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if sloppy {
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klog.InfoS("Could not parse node IP. Ignoring", "IP", ip)
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} else {
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return nil, fmt.Errorf("could not parse %q", ip)
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}
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} else {
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nodeIPs = append(nodeIPs, parsedNodeIP)
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}
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}
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}
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if len(nodeIPs) > 2 || (len(nodeIPs) == 2 && netutils.IsIPv6(nodeIPs[0]) == netutils.IsIPv6(nodeIPs[1])) {
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return nil, fmt.Errorf("must contain either a single IP or a dual-stack pair of IPs")
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} else if len(nodeIPs) == 2 && !allowDual {
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return nil, fmt.Errorf("dual-stack not supported in this configuration")
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} else if len(nodeIPs) == 2 && (nodeIPs[0].IsUnspecified() || nodeIPs[1].IsUnspecified()) {
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return nil, fmt.Errorf("dual-stack node IP cannot include '0.0.0.0' or '::'")
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}
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return nodeIPs, nil
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}
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// ParseNodeIPArgument parses kubelet's --node-ip argument. If nodeIP contains invalid
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// values, they will be logged and ignored. Dual-stack node IPs are allowed if
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// cloudProvider is unset, or if it is `"external"` and allowCloudDualStack is true.
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func ParseNodeIPArgument(nodeIP, cloudProvider string, allowCloudDualStack bool) ([]net.IP, error) {
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var allowDualStack bool
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if (cloudProvider == cloudProviderNone) || (cloudProvider == cloudProviderExternal && allowCloudDualStack) {
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allowDualStack = true
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}
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return parseNodeIP(nodeIP, allowDualStack, true)
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}
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// ParseNodeIPAnnotation parses the `alpha.kubernetes.io/provided-node-ip` annotation,
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// which can be either a single IP address or (if allowDualStack is true) a
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// comma-separated pair of IP addresses. Unlike with ParseNodeIPArgument, invalid values
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// are considered an error.
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func ParseNodeIPAnnotation(nodeIP string, allowDualStack bool) ([]net.IP, error) {
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return parseNodeIP(nodeIP, allowDualStack, false)
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}
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