forked from heketi/heketi
/
ssh.go
143 lines (117 loc) · 3.16 KB
/
ssh.go
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//
// Copyright (c) 2014 The heketi Authors
//
// 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 ssh
// :TODO: This file needs logging
import (
"bytes"
"fmt"
"golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/agent"
"io/ioutil"
"log"
"net"
"os"
"sync"
)
type SshExec struct {
clientConfig *ssh.ClientConfig
}
func getKeyFile(file string) (key ssh.Signer, err error) {
buf, err := ioutil.ReadFile(file)
if err != nil {
return
}
key, err = ssh.ParsePrivateKey(buf)
if err != nil {
fmt.Print(err)
return
}
return
}
func NewSshExecWithAuth(user string) *SshExec {
sshexec := &SshExec{}
authSocket := os.Getenv("SSH_AUTH_SOCK")
if authSocket == "" {
log.Fatal("SSH_AUTH_SOCK required, check that your ssh agent is running")
return nil
}
agentUnixSock, err := net.Dial("unix", authSocket)
if err != nil {
log.Fatal(err)
return nil
}
agent := agent.NewClient(agentUnixSock)
signers, err := agent.Signers()
if err != nil {
log.Fatal(err)
return nil
}
sshexec.clientConfig = &ssh.ClientConfig{
User: user,
Auth: []ssh.AuthMethod{ssh.PublicKeys(signers...)},
}
return sshexec
}
func NewSshExecWithKeyFile(user string, file string) *SshExec {
var key ssh.Signer
var err error
sshexec := &SshExec{}
// Now in the main function DO:
if key, err = getKeyFile(file); err != nil {
fmt.Println("Unable to get keyfile")
return nil
}
// Define the Client Config as :
sshexec.clientConfig = &ssh.ClientConfig{
User: user,
Auth: []ssh.AuthMethod{
ssh.PublicKeys(key),
},
}
return sshexec
}
// This function was taken from https://github.com/coreos/etcd-manager/blob/master/main.go
func (s *SshExec) ConnectAndExec(host string, commands []string, wg *sync.WaitGroup) ([]string, error) {
if wg != nil {
defer wg.Done()
}
buffers := make([]string, len(commands))
// :TODO: Will need a timeout here in case the server does not respond
client, err := ssh.Dial("tcp", host, s.clientConfig)
if err != nil {
//logStderr(host, fmt.Sprintf("failed to create SSH connection: %s\n", err))
return nil, err
}
for index, command := range commands {
session, err := client.NewSession()
if err != nil {
fmt.Printf("Unable to connect to [%v]: %v\n", command, err)
//logStderr(host, fmt.Sprintf("failed to create SSH session: %s", err))
return nil, err
}
defer session.Close()
var b bytes.Buffer
session.Stdout = &b
// Save the buffer for the caller
if err := session.Run(command); err != nil {
fmt.Printf("Failed to run command [%v] on [%v]: %v\n", command, host, err)
// logStderr(host, fmt.Sprintf("error running command: %s", err))
return nil, err
}
buffers[index] = b.String()
}
return buffers, nil
}