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forward.go
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forward.go
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package ssh
import (
"context"
"io"
"net"
"sync"
"time"
"github.com/loft-sh/log"
"golang.org/x/crypto/ssh"
)
func PortForward(ctx context.Context, client *ssh.Client, localNetwork, localAddr, remoteNetwork, remoteAddr string, exitAfterTimeout time.Duration, log log.Logger) error {
listener, err := net.Listen(localNetwork, localAddr)
if err != nil {
return err
}
defer listener.Close()
done := make(chan struct{})
defer close(done)
go func() {
select {
case <-done:
case <-ctx.Done():
_ = listener.Close()
}
}()
counter := newConnectionCounter(ctx, exitAfterTimeout, func() {
log.Fatalf("Stopping devpod up, because it stayed idle for a while. You can disable this via 'devpod context set-options -o EXIT_AFTER_TIMEOUT=false'")
}, localAddr, log)
for {
// waiting for a new connection
local, err := listener.Accept()
if err != nil {
return err
}
// tell the counter there is a connection
counter.Add()
// forward connection
go func() {
defer counter.Dec()
forward(local, client, remoteNetwork, remoteAddr, log)
}()
}
}
func forward(localConn net.Conn, client *ssh.Client, remoteNetwork, remoteAddr string, log log.Logger) {
// Setup sshConn (type net.Conn)
sshConn, err := client.Dial(remoteNetwork, remoteAddr)
if err != nil {
log.Debugf("error dialing remote: %v", err)
return
}
defer sshConn.Close()
// Copy localConn.Reader to sshConn.Writer
waitGroup := sync.WaitGroup{}
go func() {
defer waitGroup.Done()
defer sshConn.Close()
_, err = io.Copy(sshConn, localConn)
if err != nil {
log.Debugf("error copying to remote: %v", err)
}
}()
waitGroup.Add(1)
// Copy sshConn.Reader to localConn.Writer
go func() {
defer waitGroup.Done()
defer localConn.Close()
_, err = io.Copy(localConn, sshConn)
if err != nil {
log.Debugf("error copying to local: %v", err)
}
}()
waitGroup.Add(1)
waitGroup.Wait()
}