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// Copyright 2018 Google Inc.
//
// 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 gofer
import (
"gvisor.googlesource.com/gvisor/pkg/p9"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs/host"
"gvisor.googlesource.com/gvisor/pkg/tcpip"
"gvisor.googlesource.com/gvisor/pkg/tcpip/transport/unix"
"gvisor.googlesource.com/gvisor/pkg/waiter"
)
// BoundEndpoint returns a gofer-backed unix.BoundEndpoint.
func (i *inodeOperations) BoundEndpoint(inode *fs.Inode, path string) unix.BoundEndpoint {
if !fs.IsSocket(i.fileState.sattr) {
return nil
}
if i.session().endpoints != nil {
ep := i.session().endpoints.get(i.fileState.key)
if ep != nil {
return ep
}
// Not found in endpoints map, it may be a gofer backed unix socket...
}
inode.IncRef()
return &endpoint{inode, i.fileState.file.file, path}
}
// endpoint is a Gofer-backed unix.BoundEndpoint.
//
// An endpoint's lifetime is the time between when InodeOperations.BoundEndpoint()
// is called and either BoundEndpoint.BidirectionalConnect or
// BoundEndpoint.UnidirectionalConnect is called.
type endpoint struct {
// inode is the filesystem inode which produced this endpoint.
inode *fs.Inode
// file is the p9 file that contains a single unopened fid.
file p9.File
// path is the sentry path where this endpoint is bound.
path string
}
func unixSockToP9(t unix.SockType) (p9.ConnectFlags, bool) {
switch t {
case unix.SockStream:
return p9.StreamSocket, true
case unix.SockSeqpacket:
return p9.SeqpacketSocket, true
case unix.SockDgram:
return p9.DgramSocket, true
}
return 0, false
}
// BidirectionalConnect implements ConnectableEndpoint.BidirectionalConnect.
func (e *endpoint) BidirectionalConnect(ce unix.ConnectingEndpoint, returnConnect func(unix.Receiver, unix.ConnectedEndpoint)) *tcpip.Error {
cf, ok := unixSockToP9(ce.Type())
if !ok {
return tcpip.ErrConnectionRefused
}
// No lock ordering required as only the ConnectingEndpoint has a mutex.
ce.Lock()
defer ce.Unlock()
// Check connecting state.
if ce.Connected() {
return tcpip.ErrAlreadyConnected
}
if ce.Listening() {
return tcpip.ErrInvalidEndpointState
}
hostFile, err := e.file.Connect(cf)
if err != nil {
return tcpip.ErrConnectionRefused
}
r, c, terr := host.NewConnectedEndpoint(hostFile, ce.WaiterQueue(), e.path)
if terr != nil {
return terr
}
returnConnect(r, c)
return nil
}
// UnidirectionalConnect implements unix.BoundEndpoint.UnidirectionalConnect.
func (e *endpoint) UnidirectionalConnect() (unix.ConnectedEndpoint, *tcpip.Error) {
hostFile, err := e.file.Connect(p9.DgramSocket)
if err != nil {
return nil, tcpip.ErrConnectionRefused
}
r, c, terr := host.NewConnectedEndpoint(hostFile, &waiter.Queue{}, e.path)
if terr != nil {
return nil, terr
}
// We don't need the receiver.
r.CloseRecv()
r.Release()
return c, nil
}
// Release implements unix.BoundEndpoint.Release.
func (e *endpoint) Release() {
e.inode.DecRef()
}
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