89 lines
2.7 KiB
Go
89 lines
2.7 KiB
Go
// Copyright 2018 Google Inc.
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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 unix
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import (
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"gvisor.googlesource.com/gvisor/pkg/sentry/safemem"
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"gvisor.googlesource.com/gvisor/pkg/syserr"
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"gvisor.googlesource.com/gvisor/pkg/tcpip"
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"gvisor.googlesource.com/gvisor/pkg/tcpip/transport/unix"
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)
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// EndpointWriter implements safemem.Writer that writes to a unix.Endpoint.
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//
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// EndpointWriter is not thread-safe.
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type EndpointWriter struct {
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// Endpoint is the unix.Endpoint to write to.
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Endpoint unix.Endpoint
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// Control is the control messages to send.
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Control unix.ControlMessages
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// To is the endpoint to send to. May be nil.
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To unix.BoundEndpoint
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}
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// WriteFromBlocks implements safemem.Writer.WriteFromBlocks.
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func (w *EndpointWriter) WriteFromBlocks(srcs safemem.BlockSeq) (uint64, error) {
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return safemem.FromVecWriterFunc{func(bufs [][]byte) (int64, error) {
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n, err := w.Endpoint.SendMsg(bufs, w.Control, w.To)
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if err != nil {
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return int64(n), syserr.TranslateNetstackError(err).ToError()
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}
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return int64(n), nil
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}}.WriteFromBlocks(srcs)
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}
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// EndpointReader implements safemem.Reader that reads from a unix.Endpoint.
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//
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// EndpointReader is not thread-safe.
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type EndpointReader struct {
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// Endpoint is the unix.Endpoint to read from.
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Endpoint unix.Endpoint
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// Creds indicates if credential control messages are requested.
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Creds bool
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// NumRights is the number of SCM_RIGHTS FDs requested.
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NumRights uintptr
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// Peek indicates that the data should not be consumed from the
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// endpoint.
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Peek bool
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// MsgSize is the size of the message that was read from. For stream
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// sockets, it is the amount read.
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MsgSize uintptr
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// From, if not nil, will be set with the address read from.
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From *tcpip.FullAddress
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// Control contains the received control messages.
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Control unix.ControlMessages
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}
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// ReadToBlocks implements safemem.Reader.ReadToBlocks.
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func (r *EndpointReader) ReadToBlocks(dsts safemem.BlockSeq) (uint64, error) {
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return safemem.FromVecReaderFunc{func(bufs [][]byte) (int64, error) {
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n, ms, c, err := r.Endpoint.RecvMsg(bufs, r.Creds, r.NumRights, r.Peek, r.From)
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r.Control = c
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r.MsgSize = ms
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if err != nil {
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return int64(n), syserr.TranslateNetstackError(err).ToError()
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}
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return int64(n), nil
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}}.ReadToBlocks(dsts)
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}
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