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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package console contains utilities for working with pty consols in runsc.
package console
import (
"fmt"
"net"
"os"
"github.com/kr/pty"
"golang.org/x/sys/unix"
)
// NewWithSocket creates pty master/replica pair, sends the master FD over the
// given socket, and returns the replica.
func NewWithSocket(socketPath string) (*os.File, error) {
// Create a new pty master and replica.
ptyMaster, ptyReplica, err := pty.Open()
if err != nil {
return nil, fmt.Errorf("opening pty: %v", err)
}
defer ptyMaster.Close()
// Get a connection to the socket path.
conn, err := net.Dial("unix", socketPath)
if err != nil {
ptyReplica.Close()
return nil, fmt.Errorf("dialing socket %q: %v", socketPath, err)
}
defer conn.Close()
uc, ok := conn.(*net.UnixConn)
if !ok {
ptyReplica.Close()
return nil, fmt.Errorf("connection is not a UnixConn: %T", conn)
}
socket, err := uc.File()
if err != nil {
ptyReplica.Close()
return nil, fmt.Errorf("getting file for unix socket %v: %v", uc, err)
}
defer socket.Close()
// Send the master FD over the connection.
msg := unix.UnixRights(int(ptyMaster.Fd()))
if err := unix.Sendmsg(int(socket.Fd()), []byte("pty-master"), msg, nil, 0); err != nil {
ptyReplica.Close()
return nil, fmt.Errorf("sending console over unix socket %q: %v", socketPath, err)
}
return ptyReplica, nil
}
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