aboutsummaryrefslogtreecommitdiff
path: root/pkg/namespaces/namespaces.go
blob: ec92763440170d1f8bce163425f9c7bca822e6f9 (plain)
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
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
package namespaces

import (
	"strings"
)

// UsernsMode represents userns mode in the container.
type UsernsMode string

// IsHost indicates whether the container uses the host's userns.
func (n UsernsMode) IsHost() bool {
	return n == "host"
}

// IsKeepID indicates whether container uses a mapping where the (uid, gid) on the host is lept inside of the namespace.
func (n UsernsMode) IsKeepID() bool {
	return n == "keep-id"
}

// IsPrivate indicates whether the container uses the a private userns.
func (n UsernsMode) IsPrivate() bool {
	return !(n.IsHost())
}

// Valid indicates whether the userns is valid.
func (n UsernsMode) Valid() bool {
	parts := strings.Split(string(n), ":")
	switch mode := parts[0]; mode {
	case "", "host", "keep-id":
	default:
		return false
	}
	return true
}

// IsContainer indicates whether container uses a container userns.
func (n UsernsMode) IsContainer() bool {
	return false
}

// Container is the id of the container which network this container is connected to.
func (n UsernsMode) Container() string {
	return ""
}

// UTSMode represents the UTS namespace of the container.
type UTSMode string

// IsPrivate indicates whether the container uses its private UTS namespace.
func (n UTSMode) IsPrivate() bool {
	return !(n.IsHost())
}

// IsHost indicates whether the container uses the host's UTS namespace.
func (n UTSMode) IsHost() bool {
	return n == "host"
}

// IsContainer indicates whether the container uses a container's UTS namespace.
func (n UTSMode) IsContainer() bool {
	parts := strings.SplitN(string(n), ":", 2)
	return len(parts) > 1 && parts[0] == "container"
}

// Container returns the name of the container whose uts namespace is going to be used.
func (n UTSMode) Container() string {
	parts := strings.SplitN(string(n), ":", 2)
	if len(parts) > 1 {
		return parts[1]
	}
	return ""
}

// Valid indicates whether the UTS namespace is valid.
func (n UTSMode) Valid() bool {
	parts := strings.Split(string(n), ":")
	switch mode := parts[0]; mode {
	case "", "host":
	case "container":
		if len(parts) != 2 || parts[1] == "" {
			return false
		}
	default:
		return false
	}
	return true
}

// IpcMode represents the container ipc stack.
type IpcMode string

// IsPrivate indicates whether the container uses its own private ipc namespace which cannot be shared.
func (n IpcMode) IsPrivate() bool {
	return n == "private"
}

// IsHost indicates whether the container shares the host's ipc namespace.
func (n IpcMode) IsHost() bool {
	return n == "host"
}

// IsShareable indicates whether the container's ipc namespace can be shared with another container.
func (n IpcMode) IsShareable() bool {
	return n == "shareable"
}

// IsContainer indicates whether the container uses another container's ipc namespace.
func (n IpcMode) IsContainer() bool {
	parts := strings.SplitN(string(n), ":", 2)
	return len(parts) > 1 && parts[0] == "container"
}

// IsNone indicates whether container IpcMode is set to "none".
func (n IpcMode) IsNone() bool {
	return n == "none"
}

// IsEmpty indicates whether container IpcMode is empty
func (n IpcMode) IsEmpty() bool {
	return n == ""
}

// Valid indicates whether the ipc mode is valid.
func (n IpcMode) Valid() bool {
	return n.IsEmpty() || n.IsNone() || n.IsPrivate() || n.IsHost() || n.IsShareable() || n.IsContainer()
}

// Container returns the name of the container ipc stack is going to be used.
func (n IpcMode) Container() string {
	parts := strings.SplitN(string(n), ":", 2)
	if len(parts) > 1 && parts[0] == "container" {
		return parts[1]
	}
	return ""
}

// PidMode represents the pid namespace of the container.
type PidMode string

// IsPrivate indicates whether the container uses its own new pid namespace.
func (n PidMode) IsPrivate() bool {
	return !(n.IsHost() || n.IsContainer())
}

// IsHost indicates whether the container uses the host's pid namespace.
func (n PidMode) IsHost() bool {
	return n == "host"
}

// IsContainer indicates whether the container uses a container's pid namespace.
func (n PidMode) IsContainer() bool {
	parts := strings.SplitN(string(n), ":", 2)
	return len(parts) > 1 && parts[0] == "container"
}

// Valid indicates whether the pid namespace is valid.
func (n PidMode) Valid() bool {
	parts := strings.Split(string(n), ":")
	switch mode := parts[0]; mode {
	case "", "host":
	case "container":
		if len(parts) != 2 || parts[1] == "" {
			return false
		}
	default:
		return false
	}
	return true
}

// Container returns the name of the container whose pid namespace is going to be used.
func (n PidMode) Container() string {
	parts := strings.SplitN(string(n), ":", 2)
	if len(parts) > 1 {
		return parts[1]
	}
	return ""
}

// NetworkMode represents the container network stack.
type NetworkMode string

// IsNone indicates whether container isn't using a network stack.
func (n NetworkMode) IsNone() bool {
	return n == "none"
}

// IsHost indicates whether the container uses the host's network stack.
func (n NetworkMode) IsHost() bool {
	return n == "host"
}

// IsDefault indicates whether container uses the default network stack.
func (n NetworkMode) IsDefault() bool {
	return n == "default"
}

// IsPrivate indicates whether container uses its private network stack.
func (n NetworkMode) IsPrivate() bool {
	return !(n.IsHost() || n.IsContainer())
}

// IsContainer indicates whether container uses a container network stack.
func (n NetworkMode) IsContainer() bool {
	parts := strings.SplitN(string(n), ":", 2)
	return len(parts) > 1 && parts[0] == "container"
}

// Container is the id of the container which network this container is connected to.
func (n NetworkMode) Container() string {
	parts := strings.SplitN(string(n), ":", 2)
	if len(parts) > 1 {
		return parts[1]
	}
	return ""
}

//UserDefined indicates user-created network
func (n NetworkMode) UserDefined() string {
	if n.IsUserDefined() {
		return string(n)
	}
	return ""
}

// IsBridge indicates whether container uses the bridge network stack
func (n NetworkMode) IsBridge() bool {
	return n == "bridge"
}

// IsSlirp4netns indicates if we are running a rootless network stack
func (n NetworkMode) IsSlirp4netns() bool {
	return n == "slirp4netns"
}

// IsNS indicates a network namespace passed in by path (ns:<path>)
func (n NetworkMode) IsNS() bool {
	return strings.HasPrefix(string(n), "ns:")
}

// NS gets the path associated with a ns:<path> network ns
func (n NetworkMode) NS() string {
	parts := strings.SplitN(string(n), ":", 2)
	if len(parts) > 1 {
		return parts[1]
	}
	return ""
}

// IsPod returns whether the network refers to pod networking
func (n NetworkMode) IsPod() bool {
	return n == "pod"
}

// IsUserDefined indicates user-created network
func (n NetworkMode) IsUserDefined() bool {
	return !n.IsDefault() && !n.IsBridge() && !n.IsHost() && !n.IsNone() && !n.IsContainer() && !n.IsSlirp4netns() && !n.IsNS()
}