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package libpod
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"strconv"
"strings"
"time"
"github.com/containers/common/libnetwork/types"
"github.com/containers/common/pkg/machine"
"github.com/sirupsen/logrus"
)
const machineGvproxyEndpoint = "gateway.containers.internal"
// machineExpose is the struct for the gvproxy port forwarding api send via json
type machineExpose struct {
// Local is the local address on the vm host, format is ip:port
Local string `json:"local"`
// Remote is used to specify the vm ip:port
Remote string `json:"remote,omitempty"`
// Protocol to forward, tcp or udp
Protocol string `json:"protocol"`
}
func requestMachinePorts(expose bool, ports []types.PortMapping) error {
url := "http://" + machineGvproxyEndpoint + "/services/forwarder/"
if expose {
url += "expose"
} else {
url += "unexpose"
}
ctx := context.Background()
client := &http.Client{
Transport: &http.Transport{
// make sure to not set a proxy here so explicitly ignore the proxy
// since we want to talk directly to gvproxy
// https://github.com/containers/podman/issues/13628
Proxy: nil,
MaxIdleConns: 50,
IdleConnTimeout: 30 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
},
}
buf := new(bytes.Buffer)
for num, port := range ports {
protocols := strings.Split(port.Protocol, ",")
for _, protocol := range protocols {
for i := uint16(0); i < port.Range; i++ {
machinePort := machineExpose{
Local: net.JoinHostPort(port.HostIP, strconv.FormatInt(int64(port.HostPort+i), 10)),
Protocol: protocol,
}
if expose {
// only set the remote port the ip will be automatically be set by gvproxy
machinePort.Remote = ":" + strconv.FormatInt(int64(port.HostPort+i), 10)
}
// post request
if err := json.NewEncoder(buf).Encode(machinePort); err != nil {
if expose {
// in case of an error make sure to unexpose the other ports
if cerr := requestMachinePorts(false, ports[:num]); cerr != nil {
logrus.Errorf("failed to free gvproxy machine ports: %v", cerr)
}
}
return err
}
if err := makeMachineRequest(ctx, client, url, buf); err != nil {
if expose {
// in case of an error make sure to unexpose the other ports
if cerr := requestMachinePorts(false, ports[:num]); cerr != nil {
logrus.Errorf("failed to free gvproxy machine ports: %v", cerr)
}
}
return err
}
buf.Reset()
}
}
}
return nil
}
func makeMachineRequest(ctx context.Context, client *http.Client, url string, buf io.Reader) error {
req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, buf)
if err != nil {
return err
}
req.Header.Add("Accept", "application/json")
req.Header.Add("Content-Type", "application/json")
resp, err := client.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return annotateGvproxyResponseError(resp.Body)
}
return nil
}
func annotateGvproxyResponseError(r io.Reader) error {
b, err := ioutil.ReadAll(r)
if err == nil && len(b) > 0 {
return fmt.Errorf("something went wrong with the request: %q", string(b))
}
return errors.New("something went wrong with the request, could not read response")
}
// exposeMachinePorts exposes the ports for podman machine via gvproxy
func (r *Runtime) exposeMachinePorts(ports []types.PortMapping) error {
if !machine.IsGvProxyBased() {
return nil
}
return requestMachinePorts(true, ports)
}
// unexposeMachinePorts closes the ports for podman machine via gvproxy
func (r *Runtime) unexposeMachinePorts(ports []types.PortMapping) error {
if !machine.IsGvProxyBased() {
return nil
}
return requestMachinePorts(false, ports)
}
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