1 /* 2 Copyright 2016 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 net 18 19 import ( 20 "errors" 21 "net" 22 "reflect" 23 "strings" 24 "syscall" 25 ) 26 27 // IPNetEqual checks if the two input IPNets are representing the same subnet. 28 // For example, 29 // 30 // 10.0.0.1/24 and 10.0.0.0/24 are the same subnet. 31 // 10.0.0.1/24 and 10.0.0.0/25 are not the same subnet. 32 func IPNetEqual(ipnet1, ipnet2 *net.IPNet) bool { 33 if ipnet1 == nil || ipnet2 == nil { 34 return false 35 } 36 if reflect.DeepEqual(ipnet1.Mask, ipnet2.Mask) && ipnet1.Contains(ipnet2.IP) && ipnet2.Contains(ipnet1.IP) { 37 return true 38 } 39 return false 40 } 41 42 // Returns if the given err is "connection reset by peer" error. 43 func IsConnectionReset(err error) bool { 44 var errno syscall.Errno 45 if errors.As(err, &errno) { 46 return errno == syscall.ECONNRESET 47 } 48 return false 49 } 50 51 // Returns if the given err is "http2: client connection lost" error. 52 func IsHTTP2ConnectionLost(err error) bool { 53 return err != nil && strings.Contains(err.Error(), "http2: client connection lost") 54 } 55 56 // Returns if the given err is "connection refused" error 57 func IsConnectionRefused(err error) bool { 58 var errno syscall.Errno 59 if errors.As(err, &errno) { 60 return errno == syscall.ECONNREFUSED 61 } 62 return false 63 } 64