/
endpoint.go
197 lines (162 loc) · 4.16 KB
/
endpoint.go
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
package main
import (
"fmt"
"log"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"github.com/docker/libnetwork/drivers/remote/api"
"github.com/fsouza/go-dockerclient"
"github.com/vishvananda/netlink"
)
type Endpoint struct {
*api.CreateEndpointRequest
Name string
EndpointShortID string
IPStr string
SubnetStr string
SandboxKey string
NetNS string
}
func NewEndpoint(req *api.CreateEndpointRequest) *Endpoint {
e := &Endpoint{req, "", "", "", "", "", ""}
if len(e.EndpointID) < 5 {
e.EndpointShortID = e.EndpointID
} else {
e.EndpointShortID = e.EndpointID[:5]
}
return e
}
func (e *Endpoint) Create(network *Network) error {
e.updateNetworkInfo(network)
return nil
}
func (e *Endpoint) makeIface(network *Network, netns string) error {
if vethLink, _ := netlink.LinkByName("veth" + e.EndpointShortID); vethLink != nil {
log.Println("veth"+e.EndpointShortID, "already exist")
} else {
ethLink, err := netlink.LinkByName(network.Eth)
if err != nil {
fmt.Println("[Err] LinkByName:", err)
return err
}
attrs := netlink.NewLinkAttrs()
attrs.Name = "veth" + e.EndpointShortID
attrs.ParentIndex = ethLink.Attrs().Index
vlan := &netlink.Vlan{
attrs, network.VLanID,
}
if err := netlink.LinkAdd(vlan); err != nil {
log.Println("Err: ", err, "LinkAdd")
return err
}
}
if err := exec.Command("ip", "link", "set", "veth"+e.EndpointShortID, "netns", netns).Run(); err != nil {
log.Println("Err: ", err, "LinkSet NS")
return err
}
return nil
}
func (e *Endpoint) activate(network *Network, netns string) error {
networkInfo, err := e.getNetworkInfoFromDocker(network.NetworkID)
if err != nil {
return err
}
for _, eInfo := range networkInfo.Endpoints {
if eInfo.ID == e.EndpointID {
e.Name = eInfo.Name
break
}
}
fmt.Println("Activate: name:", e.Name, "endpointID", e.EndpointID)
_name := strings.Split(e.Name, "-")
e.IPStr = strings.Replace(_name[0], "_", ".", -1)
e.SubnetStr = _name[1]
ipstr := e.IPStr + "/" + e.SubnetStr
fmt.Println("ip:", e.IPStr, "subnet:", e.SubnetStr)
cmd := []string{
"netns", "exec", netns,
"ip", "addr", "add", ipstr, "dev", "veth" + e.EndpointShortID}
if err := exec.Command("ip", cmd...).Run(); err != nil {
return err
}
cmd2 := []string{
"netns", "exec", netns,
"ip", "link", "set", "veth" + e.EndpointShortID, "up"}
if err := exec.Command("ip", cmd2...).Run(); err != nil {
return err
}
return nil
}
func (Endpoint) getNetworkInfoFromDocker(networkID string) (*docker.Network, error) {
//TODO:
dockerEp := "unix:///var/run/docker.sock"
client, err := docker.NewClient(dockerEp)
if err != nil {
return nil, err
}
nwInfo, err := client.NetworkInfo(networkID)
if err != nil {
return nil, err
}
return nwInfo, nil
}
func (e *Endpoint) updateNetworkInfo(network *Network) error {
//TODO:
nwInfo, err := e.getNetworkInfoFromDocker(network.NetworkID)
if err != nil {
return err
}
network.Name = nwInfo.Name
if name := strings.Split(network.Name, "-"); len(name) >= 2 {
network.Eth = name[0]
network.VLanID, err = strconv.Atoi(name[1])
if err != nil {
return err
}
} else {
network.Eth = "eth1"
network.VLanID = 100
}
return nil
}
func (e *Endpoint) Delete() error {
if err := exec.Command("ip", "netns", "delete", e.EndpointShortID).Run(); err != nil {
return err
}
return nil
}
func (e *Endpoint) Join(network *Network, sandboxKey string) error {
e.SandboxKey = sandboxKey
if e.SandboxKey == "" {
return fmt.Errorf("SandboxKey is empty!")
}
e.NetNS = filepath.Base(e.SandboxKey)
log.Println("netns:", e.NetNS)
//ln -sf to /var/run/netns
if err := os.MkdirAll("/var/run/netns", 0777); err != nil {
return err
}
if err := exec.Command("ln", "-sf", e.SandboxKey, "/var/run/netns").Run(); err != nil {
return err
}
if err := e.makeIface(network, e.NetNS); err != nil {
return err
}
if err := e.activate(network, e.NetNS); err != nil {
return err
}
return nil
}
func (e *Endpoint) Leave() error {
cmd := []string{
"netns", "exec", e.EndpointShortID,
"ip", "link", "delete", "veth0",
}
if err := exec.Command("ip", cmd...).Run(); err != nil {
return err
}
return nil
}