Matthias Andreas Benkard | 832a54e | 2019-01-29 09:27:38 +0100 | [diff] [blame] | 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 discovery |
| 18 | |
| 19 | import ( |
| 20 | "net" |
| 21 | |
| 22 | metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" |
| 23 | ) |
| 24 | |
| 25 | type Addresses interface { |
| 26 | ServerAddressByClientCIDRs(net.IP) []metav1.ServerAddressByClientCIDR |
| 27 | } |
| 28 | |
| 29 | // DefaultAddresses is a default implementation of Addresses that will work in most cases |
| 30 | type DefaultAddresses struct { |
| 31 | // CIDRRules is a list of CIDRs and Addresses to use if a client is in the range |
| 32 | CIDRRules []CIDRRule |
| 33 | |
| 34 | // DefaultAddress is the address (hostname or IP and port) that should be used in |
| 35 | // if no CIDR matches more specifically. |
| 36 | DefaultAddress string |
| 37 | } |
| 38 | |
| 39 | // CIDRRule is a rule for adding an alternate path to the master based on matching CIDR |
| 40 | type CIDRRule struct { |
| 41 | IPRange net.IPNet |
| 42 | |
| 43 | // Address is the address (hostname or IP and port) that should be used in |
| 44 | // if this CIDR matches |
| 45 | Address string |
| 46 | } |
| 47 | |
| 48 | func (d DefaultAddresses) ServerAddressByClientCIDRs(clientIP net.IP) []metav1.ServerAddressByClientCIDR { |
| 49 | addressCIDRMap := []metav1.ServerAddressByClientCIDR{ |
| 50 | { |
| 51 | ClientCIDR: "0.0.0.0/0", |
| 52 | ServerAddress: d.DefaultAddress, |
| 53 | }, |
| 54 | } |
| 55 | |
| 56 | for _, rule := range d.CIDRRules { |
| 57 | addressCIDRMap = append(addressCIDRMap, rule.ServerAddressByClientCIDRs(clientIP)...) |
| 58 | } |
| 59 | return addressCIDRMap |
| 60 | } |
| 61 | |
| 62 | func (d CIDRRule) ServerAddressByClientCIDRs(clientIP net.IP) []metav1.ServerAddressByClientCIDR { |
| 63 | addressCIDRMap := []metav1.ServerAddressByClientCIDR{} |
| 64 | |
| 65 | if d.IPRange.Contains(clientIP) { |
| 66 | addressCIDRMap = append(addressCIDRMap, metav1.ServerAddressByClientCIDR{ |
| 67 | ClientCIDR: d.IPRange.String(), |
| 68 | ServerAddress: d.Address, |
| 69 | }) |
| 70 | } |
| 71 | return addressCIDRMap |
| 72 | } |