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-rw-r--r--runsc/console/console.go63
1 files changed, 63 insertions, 0 deletions
diff --git a/runsc/console/console.go b/runsc/console/console.go
new file mode 100644
index 000000000..64b23639a
--- /dev/null
+++ b/runsc/console/console.go
@@ -0,0 +1,63 @@
+// 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/slave pair, sends the master FD over the given
+// socket, and returns the slave.
+func NewWithSocket(socketPath string) (*os.File, error) {
+ // Create a new pty master and slave.
+ ptyMaster, ptySlave, 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 {
+ ptySlave.Close()
+ return nil, fmt.Errorf("dialing socket %q: %v", socketPath, err)
+ }
+ defer conn.Close()
+ uc, ok := conn.(*net.UnixConn)
+ if !ok {
+ ptySlave.Close()
+ return nil, fmt.Errorf("connection is not a UnixConn: %T", conn)
+ }
+ socket, err := uc.File()
+ if err != nil {
+ ptySlave.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 {
+ ptySlave.Close()
+ return nil, fmt.Errorf("sending console over unix socket %q: %v", socketPath, err)
+ }
+ return ptySlave, nil
+}