| /* |
| Copyright 2017 The Kubernetes Authors. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| */ |
| |
| package util |
| |
| import ( |
| "fmt" |
| "net" |
| "strconv" |
| |
| "k8s.io/klog" |
| ) |
| |
| // IPPart returns just the IP part of an IP or IP:port or endpoint string. If the IP |
| // part is an IPv6 address enclosed in brackets (e.g. "[fd00:1::5]:9999"), |
| // then the brackets are stripped as well. |
| func IPPart(s string) string { |
| if ip := net.ParseIP(s); ip != nil { |
| // IP address without port |
| return s |
| } |
| // Must be IP:port |
| host, _, err := net.SplitHostPort(s) |
| if err != nil { |
| klog.Errorf("Error parsing '%s': %v", s, err) |
| return "" |
| } |
| // Check if host string is a valid IP address |
| if ip := net.ParseIP(host); ip != nil { |
| return ip.String() |
| } else { |
| klog.Errorf("invalid IP part '%s'", host) |
| } |
| return "" |
| } |
| |
| // PortPart returns just the port part of an endpoint string. |
| func PortPart(s string) (int, error) { |
| // Must be IP:port |
| _, port, err := net.SplitHostPort(s) |
| if err != nil { |
| klog.Errorf("Error parsing '%s': %v", s, err) |
| return -1, err |
| } |
| portNumber, err := strconv.Atoi(port) |
| if err != nil { |
| klog.Errorf("Error parsing '%s': %v", port, err) |
| return -1, err |
| } |
| return portNumber, nil |
| } |
| |
| // ToCIDR returns a host address of the form <ip-address>/32 for |
| // IPv4 and <ip-address>/128 for IPv6 |
| func ToCIDR(ip net.IP) string { |
| len := 32 |
| if ip.To4() == nil { |
| len = 128 |
| } |
| return fmt.Sprintf("%s/%d", ip.String(), len) |
| } |