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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
//go:build linux || freebsd
// +build linux freebsd
package libnetwork
import (
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"net"
"os"
"path/filepath"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/libnetwork/types"
"github.com/opencontainers/runtime-spec/specs-go"
"github.com/sirupsen/logrus"
)
const (
execSubdir = "libnetwork"
defaultExecRoot = "/run/docker"
success = "success"
)
// processSetKeyReexec is a private function that must be called only on an reexec path
// It expects 3 args { [0] = "libnetwork-setkey", [1] = <container-id>, [2] = <short-controller-id> }
// It also expects specs.State as a json string in <stdin>
// Refer to https://github.com/opencontainers/runc/pull/160/ for more information
// The docker exec-root can be specified as "-exec-root" flag. The default value is "/run/docker".
func processSetKeyReexec() {
var err error
// Return a failure to the calling process via ExitCode
defer func() {
if err != nil {
logrus.Fatalf("%v", err)
}
}()
execRoot := flag.String("exec-root", defaultExecRoot, "docker exec root")
flag.Parse()
// expecting 3 os.Args {[0]="libnetwork-setkey", [1]=<container-id>, [2]=<short-controller-id> }
// (i.e. expecting 2 flag.Args())
args := flag.Args()
if len(args) < 2 {
err = fmt.Errorf("Re-exec expects 2 args (after parsing flags), received : %d", len(args))
return
}
containerID, shortCtlrID := args[0], args[1]
// We expect specs.State as a json string in <stdin>
stateBuf, err := ioutil.ReadAll(os.Stdin)
if err != nil {
return
}
var state specs.State
if err = json.Unmarshal(stateBuf, &state); err != nil {
return
}
err = SetExternalKey(shortCtlrID, containerID, fmt.Sprintf("/proc/%d/ns/net", state.Pid), *execRoot)
}
// SetExternalKey provides a convenient way to set an External key to a sandbox
func SetExternalKey(shortCtlrID string, containerID string, key string, execRoot string) error {
keyData := setKeyData{
ContainerID: containerID,
Key: key}
uds := filepath.Join(execRoot, execSubdir, shortCtlrID+".sock")
c, err := net.Dial("unix", uds)
if err != nil {
return err
}
defer c.Close()
if err = sendKey(c, keyData); err != nil {
return fmt.Errorf("sendKey failed with : %v", err)
}
return processReturn(c)
}
func sendKey(c net.Conn, data setKeyData) error {
var err error
defer func() {
if err != nil {
c.Close()
}
}()
var b []byte
if b, err = json.Marshal(data); err != nil {
return err
}
_, err = c.Write(b)
return err
}
func processReturn(r io.Reader) error {
buf := make([]byte, 1024)
n, err := r.Read(buf[:])
if err != nil {
return fmt.Errorf("failed to read buf in processReturn : %v", err)
}
if string(buf[0:n]) != success {
return fmt.Errorf(string(buf[0:n]))
}
return nil
}
func (c *controller) startExternalKeyListener() error {
execRoot := defaultExecRoot
if v := c.Config().Daemon.ExecRoot; v != "" {
execRoot = v
}
udsBase := filepath.Join(execRoot, execSubdir)
if err := os.MkdirAll(udsBase, 0600); err != nil {
return err
}
shortCtlrID := stringid.TruncateID(c.id)
uds := filepath.Join(udsBase, shortCtlrID+".sock")
l, err := net.Listen("unix", uds)
if err != nil {
return err
}
if err := os.Chmod(uds, 0600); err != nil {
l.Close()
return err
}
c.Lock()
c.extKeyListener = l
c.Unlock()
go c.acceptClientConnections(uds, l)
return nil
}
func (c *controller) acceptClientConnections(sock string, l net.Listener) {
for {
conn, err := l.Accept()
if err != nil {
if _, err1 := os.Stat(sock); os.IsNotExist(err1) {
logrus.Debugf("Unix socket %s doesn't exist. cannot accept client connections", sock)
return
}
logrus.Errorf("Error accepting connection %v", err)
continue
}
go func() {
defer conn.Close()
err := c.processExternalKey(conn)
ret := success
if err != nil {
ret = err.Error()
}
_, err = conn.Write([]byte(ret))
if err != nil {
logrus.Errorf("Error returning to the client %v", err)
}
}()
}
}
func (c *controller) processExternalKey(conn net.Conn) error {
buf := make([]byte, 1280)
nr, err := conn.Read(buf)
if err != nil {
return err
}
var s setKeyData
if err = json.Unmarshal(buf[0:nr], &s); err != nil {
return err
}
var sandbox Sandbox
search := SandboxContainerWalker(&sandbox, s.ContainerID)
c.WalkSandboxes(search)
if sandbox == nil {
return types.BadRequestErrorf("no sandbox present for %s", s.ContainerID)
}
return sandbox.SetKey(s.Key)
}
func (c *controller) stopExternalKeyListener() {
c.extKeyListener.Close()
}
|
