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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 ramfs
import (
"gvisor.googlesource.com/gvisor/pkg/abi/linux"
"gvisor.googlesource.com/gvisor/pkg/sentry/context"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs/fsutil"
"gvisor.googlesource.com/gvisor/pkg/sentry/socket/unix/transport"
"gvisor.googlesource.com/gvisor/pkg/waiter"
)
// Socket represents a socket.
//
// +stateify savable
type Socket struct {
fsutil.InodeGenericChecker `state:"nosave"`
fsutil.InodeNoopRelease `state:"nosave"`
fsutil.InodeNoopWriteOut `state:"nosave"`
fsutil.InodeNotDirectory `state:"nosave"`
fsutil.InodeNotMappable `state:"nosave"`
fsutil.InodeNotSymlink `state:"nosave"`
fsutil.InodeNotTruncatable `state:"nosave"`
fsutil.InodeVirtual `state:"nosave"`
fsutil.InodeSimpleAttributes
fsutil.InodeSimpleExtendedAttributes
// ep is the bound endpoint.
ep transport.BoundEndpoint
}
var _ fs.InodeOperations = (*Socket)(nil)
// NewSocket returns a new Socket.
func NewSocket(ctx context.Context, ep transport.BoundEndpoint, owner fs.FileOwner, perms fs.FilePermissions) *Socket {
return &Socket{
InodeSimpleAttributes: fsutil.NewInodeSimpleAttributes(ctx, owner, perms, linux.SOCKFS_MAGIC),
ep: ep,
}
}
// BoundEndpoint returns the socket data.
func (s *Socket) BoundEndpoint(*fs.Inode, string) transport.BoundEndpoint {
// ramfs only supports stored sentry internal sockets. Only gofer sockets
// care about the path argument.
return s.ep
}
// GetFile implements fs.FileOperations.GetFile.
func (s *Socket) GetFile(ctx context.Context, dirent *fs.Dirent, flags fs.FileFlags) (*fs.File, error) {
return fs.NewFile(ctx, dirent, flags, &socketFileOperations{}), nil
}
// +stateify savable
type socketFileOperations struct {
waiter.AlwaysReady `state:"nosave"`
fsutil.FileNoIoctl `state:"nosave"`
fsutil.FileNoMMap `state:"nosave"`
fsutil.FileNoopFlush `state:"nosave"`
fsutil.FileNoopFsync `state:"nosave"`
fsutil.FileNoopRelease `state:"nosave"`
fsutil.FileNoRead `state:"nosave"`
fsutil.FileNoSeek `state:"nosave"`
fsutil.FileNotDirReaddir `state:"nosave"`
fsutil.FileNoWrite `state:"nosave"`
fsutil.FileUseInodeUnstableAttr `state:"nosave"`
}
var _ fs.FileOperations = (*socketFileOperations)(nil)
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