111 lines
3.4 KiB
Go
111 lines
3.4 KiB
Go
/*
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Copyright The containerd 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 server
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import (
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"context"
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"fmt"
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"io"
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"net"
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"time"
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"github.com/containerd/log"
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)
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func (c *criService) portForward(ctx context.Context, id string, port int32, stream io.ReadWriter) error {
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sandbox, err := c.sandboxStore.Get(id)
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if err != nil {
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return fmt.Errorf("failed to find sandbox %q in store: %w", id, err)
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}
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var podIP string
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if !hostNetwork(sandbox.Config) {
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// get ip address of the sandbox
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podIP, _, err = c.getIPs(sandbox)
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if err != nil {
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return fmt.Errorf("failed to get sandbox ip: %w", err)
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}
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} else {
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// HPCs use the host networking namespace.
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// Therefore, dial to localhost.
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podIP = "localhost"
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}
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err = func() error {
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var conn net.Conn
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conn, err = net.Dial("tcp", net.JoinHostPort(podIP, fmt.Sprintf("%d", port)))
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if err != nil {
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return fmt.Errorf("failed to connect to %s:%d for pod %q: %v", podIP, port, id, err)
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}
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log.G(ctx).Debugf("Connection to ip %s and port %d was successful", podIP, port)
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defer conn.Close()
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// copy stream
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errCh := make(chan error, 2)
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// Copy from the namespace port connection to the client stream
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go func() {
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log.G(ctx).Debugf("PortForward copying data from namespace %q port %d to the client stream", id, port)
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_, err := io.Copy(stream, conn)
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errCh <- err
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}()
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// Copy from the client stream to the namespace port connection
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go func() {
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log.G(ctx).Debugf("PortForward copying data from client stream to namespace %q port %d", id, port)
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_, err := io.Copy(conn, stream)
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errCh <- err
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}()
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// Wait until the first error is returned by one of the connections
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// we use errFwd to store the result of the port forwarding operation
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// if the context is cancelled close everything and return
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var errFwd error
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select {
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case errFwd = <-errCh:
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log.G(ctx).Debugf("PortForward stop forwarding in one direction in network namespace %q port %d: %v", id, port, errFwd)
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case <-ctx.Done():
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log.G(ctx).Debugf("PortForward cancelled in network namespace %q port %d: %v", id, port, ctx.Err())
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return ctx.Err()
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}
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// give a chance to terminate gracefully or timeout
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// after 1s
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const timeout = time.Second
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select {
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case e := <-errCh:
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if errFwd == nil {
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errFwd = e
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}
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log.G(ctx).Debugf("PortForward stopped forwarding in both directions in network namespace %q port %d: %v", id, port, e)
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case <-time.After(timeout):
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log.G(ctx).Debugf("PortForward timed out waiting to close the connection in network namespace %q port %d", id, port)
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case <-ctx.Done():
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log.G(ctx).Debugf("PortForward cancelled in network namespace %q port %d: %v", id, port, ctx.Err())
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errFwd = ctx.Err()
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}
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return errFwd
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}()
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if err != nil {
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return fmt.Errorf("failed to execute portforward for podId %v, podIp %v, err: %w", id, podIP, err)
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}
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log.G(ctx).Debugf("Finish port forwarding for windows %q port %d", id, port)
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return nil
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}
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