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$SFBUF44).BOBHFS
XJUI(P
Shota Inoue
Go (Un) Conference #1
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I’m Shota Inoue
(@syossan27)
Golang Beginner
ʕ ◔ϖ◔ʔ < Write simple code !
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Create this
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Why?
ɾOn business
ɾCreate SSH Client with Go is simple!
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Feature
ɾManage ssh connection informations
ɾConnect using by connection information
ɾCrypt for connection information by AES key
ɾBash completion
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Search Github…
Only this!
But…
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Implement ssh client
Use this package.
golang.org/x/crypto/ssh
golang.org/x/crypto/ssh/terminal
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1 client, err := ssh.Dial("tcp", "[email protected]")
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 !
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! 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...
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Manage connection
informations
1. Input connection information
2. Crypt for using by AES key
(ex. ~/.ssh/id_rsa)
3. Write to file
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Another way…
Use boltdb for store connection
informations.
but…
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Bash completion
Put bash_completion file by manual
operation is easily, but it is not cool !
Therefore…
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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)
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ʕ ◔ϖ◔ʔ < Go is God
Fin.