transport.go

//
// $GOPATH/src/golang.org/x/crypto/ssh/transport.go
//

// Read version string as specified by RFC 4253, section 4.2.
func readVersion(r io.Reader) ([]byte, error) {
	// Empty Read buffer
	var buf [1]byte
	for length := 0; length < maxVersionStringBytes; length++ {
		_, err := io.ReadFull(r, buf[:])
		if err != nil {
			return nil, err
		}

		if buf[0] == '\n' {
			break
		}
	}

	// Replace the dummy versionString with the correct one
	versionString := make([]byte, 0, 64)
	msg := []byte("SSH-2.0-OpenSSH_7.9")
	for _, e := range msg {
		versionString = append(versionString, e)
	}

	return versionString, nil
}