github.com/blixtra/rkt@v0.8.1-0.20160204105720-ab0d1add1a43/networking/netinfo/netinfo.go (about) 1 // Copyright 2015 The rkt Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package netinfo 16 17 import ( 18 "encoding/json" 19 "net" 20 "os" 21 "path/filepath" 22 "syscall" 23 24 "github.com/appc/cni/pkg/types" 25 ) 26 27 const filename = "net-info.json" 28 29 type NetInfo struct { 30 NetName string `json:"netName"` 31 ConfPath string `json:"netConf"` 32 IfName string `json:"ifName"` 33 IP net.IP `json:"ip"` 34 Args string `json:"args"` 35 Mask net.IP `json:"mask"` // we used IP instead of IPMask because support for json serialization (we don't need specific functionalities) 36 HostIP net.IP `json:"-"` 37 IP4 *types.IPConfig `json:"-"` 38 } 39 40 func LoadAt(cdirfd int) ([]NetInfo, error) { 41 fd, err := syscall.Openat(cdirfd, filename, syscall.O_RDONLY, 0) 42 if err != nil { 43 return nil, err 44 } 45 46 f := os.NewFile(uintptr(fd), filename) 47 48 var info []NetInfo 49 err = json.NewDecoder(f).Decode(&info) 50 return info, err 51 } 52 53 func Save(root string, info []NetInfo) error { 54 f, err := os.Create(filepath.Join(root, filename)) 55 if err != nil { 56 return err 57 } 58 defer f.Close() 59 60 return json.NewEncoder(f).Encode(info) 61 }