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ssh_helpers.go
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/
ssh_helpers.go
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/*
* Copyright 2018-2021, CS Systemes d'Information, http://csgroup.eu
*
* 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 sshtunnel
import (
"fmt"
"time"
"golang.org/x/crypto/ssh"
)
func RunCommandInSSHSessionWithTimeout(se *ssh.Session, cmd string, timeout time.Duration) (err error) {
defer OnPanic(&err)
if se == nil {
return fmt.Errorf("session se cannot be nil")
}
type result struct {
resErr error
}
resChan := make(chan result)
go func() {
var crash error
defer OnPanic(&crash)
theErr := se.Run(cmd)
defer close(resChan)
resChan <- result{
resErr: theErr,
}
return // nolint
}()
if timeout != 0 {
select {
case res := <-resChan:
return res.resErr
case <-time.After(timeout):
return tunnelError{
error: fmt.Errorf(fmt.Sprintf("timeout of %s running command %s", timeout, cmd)),
isTimeout: true,
isTemporary: false,
}
}
}
res := <-resChan
return res.resErr
}
func DialSSHWithTimeout(network, addr string, config *ssh.ClientConfig, timeout time.Duration) (
_ *ssh.Client, err error,
) {
defer OnPanic(&err)
type result struct {
resCli *ssh.Client
resErr error
}
resChan := make(chan result)
go func() {
var crash error
defer OnPanic(&crash)
theCli, theErr := sshDial(network, addr, config)
defer close(resChan)
resChan <- result{
resCli: theCli,
resErr: theErr,
}
return // nolint
}()
if timeout != 0 {
select {
case res := <-resChan:
return res.resCli, res.resErr
case <-time.After(timeout):
return nil, tunnelError{
error: fmt.Errorf(fmt.Sprintf("timeout of %s dialing", timeout)),
isTimeout: true,
isTemporary: false,
}
}
}
res := <-resChan
return res.resCli, res.resErr
}
func sshDial(network, addr string, config *ssh.ClientConfig) (_ *ssh.Client, err error) {
defer OnPanic(&err)
cl, err := ssh.Dial(network, addr, config)
if err != nil {
err = convertErrorToTunnelError(err)
return nil, err
}
return cl, nil
}