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https://github.com/k3s-io/kubernetes.git
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75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
/*
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Copyright 2017 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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"strconv"
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"k8s.io/klog/v2"
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)
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// IPPart returns just the IP part of an IP or IP:port or endpoint string. If the IP
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// part is an IPv6 address enclosed in brackets (e.g. "[fd00:1::5]:9999"),
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// then the brackets are stripped as well.
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func IPPart(s string) string {
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if ip := net.ParseIP(s); ip != nil {
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// IP address without port
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return s
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}
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// Must be IP:port
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host, _, err := net.SplitHostPort(s)
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if err != nil {
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klog.Errorf("Error parsing '%s': %v", s, err)
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return ""
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}
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// Check if host string is a valid IP address
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ip := net.ParseIP(host)
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if ip == nil {
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klog.Errorf("invalid IP part '%s'", host)
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return ""
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}
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return ip.String()
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}
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// PortPart returns just the port part of an endpoint string.
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func PortPart(s string) (int, error) {
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// Must be IP:port
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_, port, err := net.SplitHostPort(s)
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if err != nil {
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klog.Errorf("Error parsing '%s': %v", s, err)
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return -1, err
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}
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portNumber, err := strconv.Atoi(port)
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if err != nil {
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klog.Errorf("Error parsing '%s': %v", port, err)
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return -1, err
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}
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return portNumber, nil
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}
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// ToCIDR returns a host address of the form <ip-address>/32 for
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// IPv4 and <ip-address>/128 for IPv6
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func ToCIDR(ip net.IP) string {
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len := 32
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if ip.To4() == nil {
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len = 128
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}
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return fmt.Sprintf("%s/%d", ip.String(), len)
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}
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