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go ssh client(2) shell

2023-07-13

package main

import (
“bytes”
“context”
“fmt”
“io”
“strings”
“time”

"golang.org/x/crypto/ssh"

)

type Shell struct {
session *ssh.Session
ctx context.Context
inPipe io.WriteCloser
outPipe io.Reader
outputChan chan string
}

func CreateShell(ctx context.Context, cli *Client) (*Shell, string, error) {
session, err := cli.client.NewSession()
if err != nil {
return nil, “”, err
}
modes := ssh.TerminalModes{
ssh.ECHO: 0,
ssh.TTY_OP_ISPEED: 14400,
ssh.TTY_OP_OSPEED: 14400,
}
err = session.RequestPty(“xterm”, 40, 80, modes)
if err != nil {
fmt.Println("RequestPty failed ,err = ", err.Error())
return nil, “”, err
}
inPipe, err := session.StdinPipe()
if err != nil {
fmt.Printf(“error %v \n”, err.Error())
return nil, “”, err
}
outPipe, err := session.StdoutPipe()
if err != nil {
fmt.Printf(“error %v \n”, err.Error())
return nil, “”, err
}
outBuf := bytes.NewBuffer(make([]byte, 0))
session.Stdout = outBuf
if err := session.Shell(); err != nil {
fmt.Println("shell failed ,err = ", err.Error())
return nil, “”, err
}
shell := &Shell{
ctx: ctx,
session: session,
inPipe: inPipe,
outPipe: outPipe,
}
// 添加管道
shell.outputChan = make(chan string, 0)
go func(ch chan string) {
for {
output, ok := <-ch
if !ok {
return
}
fmt.Println(output)
}
}(shell.outputChan)
var prompt = “$”
if cli.user == “root” {
prompt = “#”
}

output, err := shell.ReadCmdOutputByte(true, prompt)
if err != nil {
	fmt.Println("read output error :", err)
	return nil, "", err
}
return shell, output, nil

}

func (s *Shell) Close() error {
if s.outputChan != nil {
close(s.outputChan)
}
return s.session.Close()
}

func (s *Shell) ReadCmdOutputByte(IsInteractive bool, EndPrompt string) (string, error) {
output := “”
for {
select {
case <-s.ctx.Done():
return “”, s.ctx.Err()
default:
byt := make([]byte, 1024)
n, err := s.outPipe.Read(byt)
if err != nil && err != io.EOF {
return “”, err
}
if n == 0 {
continue
}
line := string(byt)
if s.outputChan != nil {
s.outputChan <- line
}
output += line
if IsInteractive && EndPrompt != “” {
if strings.Contains(output, EndPrompt) {
return output, nil
}
} else {
if strings.Contains(output, “$”) || strings.Contains(output, “#”) {
return output, nil
}
}
}
time.Sleep(100 * time.Millisecond)
}
}

func (s *Shell) execute(cmd CommandInfo) (string, error) {
if cmd.Cmd == “” {
fmt.Println(“empty cmd”)
return “”, nil
}

_, err := s.inPipe.Write([]byte(cmd.Cmd + "\n"))
if err != nil {
	fmt.Println(err)
	return "", err
}

output, err := s.ReadCmdOutputByte(cmd.IsInteractive, cmd.EndPoint)
if err != nil {
	fmt.Println(err)
	return "", err
}

return output, nil

}

func (s *Shell) ExecuteCommands(cmds []CommandInfo) ([]CommandResult, error) {
out := make([]CommandResult, 0, len(cmds))
for _, cmd := range cmds {
select {
case <-s.ctx.Done():
return nil, s.ctx.Err()
default:
output, err := s.execute(cmd)
if err != nil {
fmt.Println(err)
return nil, err
}
ret := CommandResult{
Cmd: cmd,
Result: output,
}
out = append(out, ret)
}
}

return out, nil

}

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