1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
// 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 gofer
import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/log"
"gvisor.dev/gvisor/pkg/p9"
"gvisor.dev/gvisor/pkg/sentry/fs"
"gvisor.dev/gvisor/pkg/sentry/fs/host"
"gvisor.dev/gvisor/pkg/sentry/socket/unix/transport"
"gvisor.dev/gvisor/pkg/syserr"
"gvisor.dev/gvisor/pkg/waiter"
)
// BoundEndpoint returns a gofer-backed transport.BoundEndpoint.
func (i *inodeOperations) BoundEndpoint(inode *fs.Inode, path string) transport.BoundEndpoint {
if !fs.IsSocket(i.fileState.sattr) {
return nil
}
if i.session().overrides != nil {
unlock := i.session().overrides.lock()
defer unlock()
ep := i.session().overrides.getBoundEndpoint(i.fileState.key)
if ep != nil {
return ep
}
// Not found in overrides map, it may be a gofer backed unix socket...
}
inode.IncRef()
return &endpoint{inode, i.fileState.file.file, path}
}
// endpoint is a Gofer-backed transport.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 sockTypeToP9(t linux.SockType) (p9.ConnectFlags, bool) {
switch t {
case linux.SOCK_STREAM:
return p9.StreamSocket, true
case linux.SOCK_SEQPACKET:
return p9.SeqpacketSocket, true
case linux.SOCK_DGRAM:
return p9.DgramSocket, true
}
return 0, false
}
// BidirectionalConnect implements ConnectableEndpoint.BidirectionalConnect.
func (e *endpoint) BidirectionalConnect(ctx context.Context, ce transport.ConnectingEndpoint, returnConnect func(transport.Receiver, transport.ConnectedEndpoint)) *syserr.Error {
cf, ok := sockTypeToP9(ce.Type())
if !ok {
return syserr.ErrConnectionRefused
}
// No lock ordering required as only the ConnectingEndpoint has a mutex.
ce.Lock()
// Check connecting state.
if ce.Connected() {
ce.Unlock()
return syserr.ErrAlreadyConnected
}
if ce.Listening() {
ce.Unlock()
return syserr.ErrInvalidEndpointState
}
hostFile, err := e.file.Connect(cf)
if err != nil {
ce.Unlock()
return syserr.ErrConnectionRefused
}
c, serr := host.NewConnectedEndpoint(ctx, hostFile, ce.WaiterQueue(), e.path)
if serr != nil {
ce.Unlock()
log.Warningf("Gofer returned invalid host socket for BidirectionalConnect; file %+v flags %+v: %v", e.file, cf, serr)
return serr
}
returnConnect(c, c)
ce.Unlock()
c.Init()
return nil
}
// UnidirectionalConnect implements
// transport.BoundEndpoint.UnidirectionalConnect.
func (e *endpoint) UnidirectionalConnect(ctx context.Context) (transport.ConnectedEndpoint, *syserr.Error) {
hostFile, err := e.file.Connect(p9.DgramSocket)
if err != nil {
return nil, syserr.ErrConnectionRefused
}
c, serr := host.NewConnectedEndpoint(ctx, hostFile, &waiter.Queue{}, e.path)
if serr != nil {
log.Warningf("Gofer returned invalid host socket for UnidirectionalConnect; file %+v: %v", e.file, serr)
return nil, serr
}
c.Init()
// We don't need the receiver.
c.CloseRecv()
c.Release()
return c, nil
}
// Release implements transport.BoundEndpoint.Release.
func (e *endpoint) Release() {
e.inode.DecRef()
}
// Passcred implements transport.BoundEndpoint.Passcred.
func (e *endpoint) Passcred() bool {
return false
}
|
