203 lines
7.2 KiB
Go
203 lines
7.2 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 netsh
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import (
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"fmt"
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"net"
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"os"
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"strings"
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"sync"
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"time"
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"github.com/golang/glog"
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utilexec "k8s.io/kubernetes/pkg/util/exec"
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)
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// Interface is an injectable interface for running netsh commands. Implementations must be goroutine-safe.
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type Interface interface {
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// EnsurePortProxyRule checks if the specified redirect exists, if not creates it
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EnsurePortProxyRule(args []string) (bool, error)
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// DeletePortProxyRule deletes the specified portproxy rule. If the rule did not exist, return error.
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DeletePortProxyRule(args []string) error
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// EnsureIPAddress checks if the specified IP Address is added to vEthernet (HNSTransparent) interface, if not, add it. If the address existed, return true.
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EnsureIPAddress(args []string, ip net.IP) (bool, error)
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// DeleteIPAddress checks if the specified IP address is present and, if so, deletes it.
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DeleteIPAddress(args []string) error
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// Restore runs `netsh exec` to restore portproxy or addresses using a file.
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// TODO Check if this is required, most likely not
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Restore(args []string) error
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// GetInterfaceToAddIP returns the interface name where Service IP needs to be added
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// IP Address needs to be added for netsh portproxy to redirect traffic
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// Reads Environment variable INTERFACE_TO_ADD_SERVICE_IP, if it is not defined then "vEthernet (HNSTransparent)" is returned
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GetInterfaceToAddIP() string
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}
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const (
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cmdNetsh string = "netsh"
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)
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// runner implements Interface in terms of exec("netsh").
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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 netsh.
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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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// EnsurePortProxyRule checks if the specified redirect exists, if not creates it.
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func (runner *runner) EnsurePortProxyRule(args []string) (bool, error) {
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glog.V(4).Infof("running netsh interface portproxy add v4tov4 %v", args)
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out, err := runner.exec.Command(cmdNetsh, args...).CombinedOutput()
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if err == nil {
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return true, nil
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}
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if ee, ok := err.(utilexec.ExitError); ok {
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// netsh uses exit(0) to indicate a success of the operation,
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// as compared to a malformed commandline, for example.
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if ee.Exited() && ee.ExitStatus() != 0 {
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return false, nil
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}
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}
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return false, fmt.Errorf("error checking portproxy rule: %v: %s", err, out)
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}
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// DeletePortProxyRule deletes the specified portproxy rule. If the rule did not exist, return error.
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func (runner *runner) DeletePortProxyRule(args []string) error {
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glog.V(4).Infof("running netsh interface portproxy delete v4tov4 %v", args)
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out, err := runner.exec.Command(cmdNetsh, args...).CombinedOutput()
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if err == nil {
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return nil
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}
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if ee, ok := err.(utilexec.ExitError); ok {
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// netsh uses exit(0) to indicate a success of the operation,
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// as compared to a malformed commandline, for example.
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if ee.Exited() && ee.ExitStatus() == 0 {
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return nil
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}
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}
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return fmt.Errorf("error deleting portproxy rule: %v: %s", err, out)
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}
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// EnsureIPAddress checks if the specified IP Address is added to interface identified by Environment variable INTERFACE_TO_ADD_SERVICE_IP, if not, add it. If the address existed, return true.
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func (runner *runner) EnsureIPAddress(args []string, ip net.IP) (bool, error) {
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// Check if the ip address exists
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intName := runner.GetInterfaceToAddIP()
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argsShowAddress := []string{
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"interface", "ipv4", "show", "address",
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"name=" + intName,
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}
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ipToCheck := ip.String()
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exists, _ := checkIPExists(ipToCheck, argsShowAddress, runner)
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if exists == true {
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glog.V(4).Infof("not adding IP address %q as it already exists", ipToCheck)
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return true, nil
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}
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// IP Address is not already added, add it now
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glog.V(4).Infof("running netsh interface ipv4 add address %v", args)
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out, err := runner.exec.Command(cmdNetsh, args...).CombinedOutput()
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if err == nil {
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// Once the IP Address is added, it takes a bit to initialize and show up when querying for it
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// Query all the IP addresses and see if the one we added is present
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// PS: We are using netsh interface ipv4 show address here to query all the IP addresses, instead of
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// querying net.InterfaceAddrs() as it returns the IP address as soon as it is added even though it is uninitialized
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glog.V(3).Infof("Waiting until IP: %v is added to the network adapter", ipToCheck)
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for {
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if exists, _ := checkIPExists(ipToCheck, argsShowAddress, runner); exists {
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return true, nil
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}
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time.Sleep(500 * time.Millisecond)
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}
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}
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if ee, ok := err.(utilexec.ExitError); ok {
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// netsh uses exit(0) to indicate a success of the operation,
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// as compared to a malformed commandline, for example.
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if ee.Exited() && ee.ExitStatus() != 0 {
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return false, nil
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}
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}
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return false, fmt.Errorf("error adding ipv4 address: %v: %s", err, out)
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}
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// DeleteIPAddress checks if the specified IP address is present and, if so, deletes it.
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func (runner *runner) DeleteIPAddress(args []string) error {
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glog.V(4).Infof("running netsh interface ipv4 delete address %v", args)
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out, err := runner.exec.Command(cmdNetsh, args...).CombinedOutput()
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if err == nil {
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return nil
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}
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if ee, ok := err.(utilexec.ExitError); ok {
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// netsh uses exit(0) to indicate a success of the operation,
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// as compared to a malformed commandline, for example.
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if ee.Exited() && ee.ExitStatus() == 0 {
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return nil
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}
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}
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return fmt.Errorf("error deleting ipv4 address: %v: %s", err, out)
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}
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// GetInterfaceToAddIP returns the interface name where Service IP needs to be added
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// IP Address needs to be added for netsh portproxy to redirect traffic
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// Reads Environment variable INTERFACE_TO_ADD_SERVICE_IP, if it is not defined then "vEthernet (HNS Internal NIC)" is returned
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func (runner *runner) GetInterfaceToAddIP() string {
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if iface := os.Getenv("INTERFACE_TO_ADD_SERVICE_IP"); len(iface) > 0 {
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return iface
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}
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return "vEthernet (HNS Internal NIC)"
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}
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// Restore is part of Interface.
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func (runner *runner) Restore(args []string) error {
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return nil
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}
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// checkIPExists checks if an IP address exists in 'netsh interface ipv4 show address' output
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func checkIPExists(ipToCheck string, args []string, runner *runner) (bool, error) {
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ipAddress, err := runner.exec.Command(cmdNetsh, args...).CombinedOutput()
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if err != nil {
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return false, err
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}
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ipAddressString := string(ipAddress[:])
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glog.V(3).Infof("Searching for IP: %v in IP dump: %v", ipToCheck, ipAddressString)
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showAddressArray := strings.Split(ipAddressString, "\n")
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for _, showAddress := range showAddressArray {
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if strings.Contains(showAddress, "IP Address:") {
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ipFromNetsh := strings.TrimLeft(showAddress, "IP Address:")
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ipFromNetsh = strings.TrimSpace(ipFromNetsh)
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if ipFromNetsh == ipToCheck {
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return true, nil
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}
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}
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}
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return false, nil
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}
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