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