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io.go
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io.go
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package ssh
import (
"context"
"errors"
"io"
"sync"
"golang.org/x/crypto/ssh"
"golang.org/x/term"
)
const (
DefaultHeight = 40
DefaultWidth = 80
)
var modes = ssh.TerminalModes{
ssh.ECHO: 0, // disable echoing
ssh.TTY_OP_ISPEED: 14400, // input speed = 14.4kbaud
ssh.TTY_OP_OSPEED: 14400, // output speed = 14.4kbaud
}
// FdReader is an io.Reader with an Fd function
type FdReader interface {
io.Reader
Fd() uintptr
}
type SessionIO struct {
Stdin io.Reader
Stdout io.WriteCloser
Stderr io.WriteCloser
AllocPTY bool
TermEnv string
}
func getFd(reader io.Reader) (fd int, ok bool) {
fdthing, ok := reader.(FdReader)
if !ok {
return 0, false
}
fd = int(fdthing.Fd())
return fd, term.IsTerminal(fd)
}
func (s *SessionIO) attach(ctx context.Context, sess *ssh.Session, cmd string) error {
if s.AllocPTY {
width, height := DefaultWidth, DefaultHeight
if fd, ok := getFd(s.Stdin); ok {
state, err := term.MakeRaw(fd)
if err != nil {
return err
}
defer term.Restore(fd, state)
}
if w, h, err := s.getAndWatchSize(ctx, sess); err == nil {
width, height = w, h
}
if err := sess.RequestPty(s.TermEnv, height, width, modes); err != nil {
return err
}
}
var closeStdin sync.Once
stdin, err := sess.StdinPipe()
if err != nil {
return err
}
defer closeStdin.Do(func() {
stdin.Close()
})
stdout, err := sess.StdoutPipe()
if err != nil {
return err
}
stderr, err := sess.StderrPipe()
if err != nil {
return err
}
go func() {
defer closeStdin.Do(func() {
stdin.Close()
})
if s.Stdin != nil {
io.Copy(stdin, s.Stdin)
}
}()
if s.Stdout != nil {
go io.Copy(s.Stdout, stdout)
}
if s.Stderr != nil {
go io.Copy(s.Stderr, stderr)
}
cmdC := make(chan error, 1)
go func() {
defer close(cmdC)
if cmd == "" {
err = sess.Shell()
} else {
err = sess.Run(cmd)
}
if err != nil && err != io.EOF {
cmdC <- err
}
}()
select {
case err := <-cmdC:
return err
case <-ctx.Done():
return errors.New("session forcibly closed; the remote process may still be running")
}
}