k8s.io/kubernetes@v1.31.0-alpha.0.0.20240520171757-56147500dadc/pkg/proxy/util/endpoints.go (about)

     1  /*
     2  Copyright 2017 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package util
    18  
    19  import (
    20  	"net"
    21  
    22  	"k8s.io/klog/v2"
    23  	netutils "k8s.io/utils/net"
    24  )
    25  
    26  // IPPart returns just the IP part of an IP or IP:port or endpoint string. If the IP
    27  // part is an IPv6 address enclosed in brackets (e.g. "[fd00:1::5]:9999"),
    28  // then the brackets are stripped as well.
    29  func IPPart(s string) string {
    30  	if ip := netutils.ParseIPSloppy(s); ip != nil {
    31  		// IP address without port
    32  		return s
    33  	}
    34  	// Must be IP:port
    35  	host, _, err := net.SplitHostPort(s)
    36  	if err != nil {
    37  		klog.ErrorS(err, "Failed to parse host-port", "input", s)
    38  		return ""
    39  	}
    40  	// Check if host string is a valid IP address
    41  	ip := netutils.ParseIPSloppy(host)
    42  	if ip == nil {
    43  		klog.ErrorS(nil, "Failed to parse IP", "input", host)
    44  		return ""
    45  	}
    46  	return ip.String()
    47  }