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proxy.go
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proxy.go
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/*
* Tencent is pleased to support the open source community by making TKEStack
* available.
*
* Copyright (C) 2012-2022 Tencent. All Rights Reserved.
*
* 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
*
* https://opensource.org/licenses/Apache-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 OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package ssh
import (
"fmt"
"net"
"time"
"tkestack.io/tke/pkg/util/log"
)
type Proxy interface {
ProxyConn(targetAddr string) (conn net.Conn, closer func(), err error)
CheckTunnel() (err error)
}
var _ Proxy = JumpServer{}
type JumpServer struct {
Config
}
func (sj JumpServer) ProxyConn(targetAddr string) (net.Conn, func(), error) {
sshstruct, err := New(&sj.Config)
if err != nil {
return nil, nil, err
}
// do not use sudo in jump server
sshstruct.Sudo = false
if sshstruct.DialTimeOut == 0 {
sshstruct.DialTimeOut = time.Second
}
jumperClient, closer, err := sshstruct.newClient()
if err != nil {
return nil, nil, err
}
type result struct {
conn net.Conn
err error
}
ch := make(chan result, 1)
go func() {
conn, err := jumperClient.Dial("tcp", targetAddr)
if err != nil {
closer()
log.Errorf("proxy %s dial %s failed: %v", sj.Host, targetAddr)
} else {
log.Debugf("proxy %s dial %s sucess", sj.Host, targetAddr)
}
r := result{conn: conn, err: err}
ch <- r
}()
select {
case r := <-ch:
return r.conn,
func() {
closer()
},
r.err
case <-time.After(sshstruct.DialTimeOut):
return nil, nil, fmt.Errorf("proxy %s dial %s time out in %s", sshstruct.Host, targetAddr, sshstruct.DialTimeOut.String())
}
}
func (sj JumpServer) CheckTunnel() error {
sshstruct, err := New(&sj.Config)
if err != nil {
return err
}
if sshstruct.DialTimeOut == 0 {
sshstruct.DialTimeOut = time.Second
}
_, closer, err := sshstruct.newClient()
if err != nil {
return err
}
closer()
return nil
}