mirror of https://github.com/k3s-io/k3s
100 lines
2.8 KiB
Go
100 lines
2.8 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package ipconfig
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import (
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"runtime"
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"strings"
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"sync"
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"k8s.io/klog"
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utilexec "k8s.io/utils/exec"
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)
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// Interface is an injectable interface for running ipconfig commands. Implementations must be goroutine-safe.
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type Interface interface {
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// GetDNSSuffixSearchList returns the list of DNS suffix to search
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GetDNSSuffixSearchList() ([]string, error)
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}
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const (
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cmdIpconfig string = "ipconfig"
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cmdDefaultArgs string = "/all"
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dnsSuffixSearchLisLabel string = "DNS Suffix Search List"
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)
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// runner implements Interface in terms of exec("ipconfig").
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type runner struct {
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mu sync.Mutex
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exec utilexec.Interface
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}
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// New returns a new Interface which will exec ipconfig.
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func New(exec utilexec.Interface) Interface {
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runner := &runner{
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exec: exec,
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}
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return runner
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}
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// GetDNSSuffixSearchList returns the list of DNS suffix to search
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func (runner *runner) GetDNSSuffixSearchList() ([]string, error) {
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// Parse the DNS suffix search list from ipconfig output
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// ipconfig /all on Windows displays the entry of DNS suffix search list
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// An example output contains:
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//
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// DNS Suffix Search List. . . . . . : example1.com
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// example2.com
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//
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// TODO: this does not work when the label is localized
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suffixList := []string{}
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if runtime.GOOS != "windows" {
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klog.V(1).Infof("ipconfig not supported on GOOS=%s", runtime.GOOS)
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return suffixList, nil
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}
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out, err := runner.exec.Command(cmdIpconfig, cmdDefaultArgs).Output()
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if err == nil {
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lines := strings.Split(string(out), "\n")
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for i, line := range lines {
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if trimmed := strings.TrimSpace(line); strings.HasPrefix(trimmed, dnsSuffixSearchLisLabel) {
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if parts := strings.Split(trimmed, ":"); len(parts) > 1 {
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if trimmed := strings.TrimSpace(parts[1]); trimmed != "" {
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suffixList = append(suffixList, strings.TrimSpace(parts[1]))
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}
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for j := i + 1; j < len(lines); j++ {
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if trimmed := strings.TrimSpace(lines[j]); trimmed != "" && !strings.Contains(trimmed, ":") {
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suffixList = append(suffixList, trimmed)
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} else {
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break
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}
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}
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}
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break
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}
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}
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} else {
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klog.V(1).Infof("Running %s %s failed: %v", cmdIpconfig, cmdDefaultArgs, err)
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}
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return suffixList, err
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}
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