/
ssh.go
53 lines (44 loc) · 1.57 KB
/
ssh.go
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// Copyright 2023 Flant JSC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package preflight
import (
"fmt"
"strconv"
"strings"
"github.com/deckhouse/deckhouse/dhctl/pkg/app"
"github.com/deckhouse/deckhouse/dhctl/pkg/log"
)
const (
DefaultTunnelLocalPort = 22322
DefaultTunnelRemotePort = 22322
)
func (pc *Checker) CheckSSHTunnel() error {
if app.PreflightSkipSSHForword {
log.InfoLn("SSH forward preflight check was skipped")
return nil
}
log.DebugF("Checking ssh tunnel with remote port %d and local port %d\n", DefaultTunnelRemotePort, DefaultTunnelLocalPort)
builder := strings.Builder{}
builder.WriteString(strconv.Itoa(DefaultTunnelLocalPort))
builder.WriteString(":localhost:")
builder.WriteString(strconv.Itoa(DefaultTunnelRemotePort))
tun := pc.sshClient.Tunnel("L", builder.String())
err := tun.Up()
if err != nil {
return fmt.Errorf(`Cannot setup tunnel to control-plane host: %w.
Please check connectivity to control-plane host and that the sshd config parameter 'AllowTcpForwarding' set to 'yes' on control-plane node.`, err)
}
tun.Stop()
return nil
}