Create SSH Manager with Go

This slide for Go(Un)Conference #1
https://gounconference.connpass.com/event/83112

Transcript

1. $SFBUF
   44)
   .BOBHFS
   XJUI
   (P Shota Inoue Go (Un) Conference #1
2. I’m Shota Inoue (@syossan27) Golang Beginner
 
 ʕ ◔ϖ◔ʔ < Write simple code !
5. Create this
6. Why? ɾOn business ɾCreate SSH Client with Go is simple!
7. Feature ɾManage ssh connection informations ɾConnect using by connection information ɾCrypt for connection information by AES key ɾBash completion
8. Search Github… Only this! But…
9. Implement ssh client Use this package. golang.org/x/crypto/ssh golang.org/x/crypto/ssh/terminal
10. 1 client, err := ssh.Dial("tcp", "root@192.168.0.1") 2 session, err := client.NewSession() 3 fd := int(os.Stdin.Fd() 4 oldState, err := terminal.MakeRaw(fd)) 5 session.Stdout = os.Stdout 6 session.Stderr = os.Stderr 7 session.Stdin = os.Stdin 8 modes := ssh.TerminalModes{ 9 ssh.ECHO: 1, 10 ssh.TTY_OP_ISPEED: 14400, 11 ssh.TTY_OP_OSPEED: 14400, 12 } 13 err = session.RequestPty("xterm-256color", h, w, modes) 14 err = session.Shell() 15 err = session.Wait() Can implement by 15 line !
11. ! Important processing 3 fd := int(os.Stdin.Fd() 4 oldState, err := terminal.MakeRaw(fd)) Important to exec ssh terminal in raw mode. If execute ssh terminal in cooked mode, buffering input. Therefore not work editor etc...
13. Manage connection informations 1. Input connection information 2. Crypt for using by AES key 
 (ex. ~/.ssh/id_rsa) 3. Write to file
14. Another way… Use boltdb for store connection informations. but…
15. Bash completion Put bash_completion file by manual operation is easily, but it is not cool ! Therefore…
16. 1 completionFileContent := ` 2 _cli_bash_autocomplete() { 3 local cur opts base 4 COMPREPLY=() 5 cur="${COMP_WORDS[COMP_CWORD]}" 6 opts=$( ${COMP_WORDS[@]:0:$COMP_CWORD} --generate-bash- completion ) 7 COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) ) 8 return 0 9 } 10 complete -F _cli_bash_autocomplete en 11 ` 12 13 f, err := os.Create(completionFile) 14 _, err = f.Write([]byte(completionFileContent)) 15 16 loadConfigFileContent := "if [ -f '/etc/bash_completion.d/en' ]; then source '/etc/bash_completion.d/en'; fi” 17 18 f, err := os.OpenFile(“~/.bashrc”, os.O_APPEND|os.O_WRONLY, 0600) 19 fmt.Fprintln(f, loadConfigFileContent)
17. ʕ ◔ϖ◔ʔ < Go is God Fin.