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
|
package main
import (
"context"
"fmt"
"log"
"os"
"time"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/mount"
"github.com/docker/docker/api/types/network"
"github.com/docker/docker/client"
"github.com/docker/go-connections/nat"
)
const (
fixedDockerVersion = "1.38"
)
var (
dockerCtx context.Context
dockerCLI *client.Client
currentVpnRemptePort = 1194
)
func setupContext() {
if dockerCtx == nil {
dockerCtx = context.Background()
}
}
func setupDockerCLI() (err error) {
os.Setenv("DOCKER_API_VERSION", "1.27")
if dockerCLI == nil {
dockerCLI, err = client.NewEnvClient()
}
return err
}
func spawnCompanion(username string, accesscode string) {
log.Println("Spwaning a new companion container")
// setup the context and the docker cli connection
setupContext()
setupDockerCLI()
sessionSalt := generateSessionSalt()
vpnRemoteAddress := os.Getenv("HOSTNAME")
// get the vpnRemoteport and increment it
vpnRemotePort := currentVpnRemptePort
log.Println("vpnRemptePort ", currentVpnRemptePort)
currentVpnRemptePort++
log.Println("Generating the container config")
Config := &container.Config{
Image: "circus-companion:latest",
Cmd: []string{"-username", username, "-accessCode", accesscode, "-sessionSalt", sessionSalt, "-vpnRemoteAddress", vpnRemoteAddress, "-vpnRemotePort", fmt.Sprintf("%d", vpnRemotePort)},
ExposedPorts: nat.PortSet{
"8080/tcp": struct{}{},
},
// Container labels used by traefik
Labels: map[string]string{
"traefik.enable": "true",
fmt.Sprintf("traefik.http.routers.%s.entrypoints", username): "web",
fmt.Sprintf("traefik.http.routers.%s.rule", username): fmt.Sprintf("Host(`%s.%s`)", username, os.Getenv("HOSTNAME")),
fmt.Sprintf("traefik.http.middlewares.%s-https-redirect.redirectscheme.scheme", username): "https",
fmt.Sprintf("traefik.http.routers.%s.middlewares", username): fmt.Sprintf("%s-https-redirect", username),
fmt.Sprintf("traefik.http.routers.%s-secure.entrypoints", username): "websecure",
fmt.Sprintf("traefik.http.routers.%s-secure.rule", username): fmt.Sprintf("Host(`%s.%s`)", username, os.Getenv("HOSTNAME")),
fmt.Sprintf("traefik.http.routers.%s-secure.tls", username): "true",
fmt.Sprintf("traefik.http.routers.%s-secure.tls.certresolver", username): "mytlschallenge",
fmt.Sprintf("traefik.http.routers.%s-secure.service", username): fmt.Sprintf("%s", username),
fmt.Sprintf("traefik.http.services.%s.loadbalancer.server.port", username): "8080",
"traefik.docker.network": "circus",
},
}
// configure the host
// this mounts the docker socket and the companion seed file into the
// container
HostConfig := &container.HostConfig{
Mounts: []mount.Mount{
{
Type: mount.TypeBind,
Source: "/var/run/docker.sock",
Target: "/var/run/docker.sock",
},
{
Type: mount.TypeBind,
Source: "/etc/companion.json",
Target: "/etc/companion.json",
},
},
}
circusNetworkID, err := getCircusNetworkID(dockerCtx, dockerCLI)
NetworkingConfig := &network.NetworkingConfig{
EndpointsConfig: map[string]*network.EndpointSettings{
"circus": {
NetworkID: circusNetworkID,
},
},
}
log.Println("Creating the container")
// create the docker container
resp, err := dockerCLI.ContainerCreate(dockerCtx, Config, HostConfig, NetworkingConfig, "")
if err != nil {
panic(err)
}
log.Println("Container created!")
// id of the created container
containerID := resp.ID
// start the docker container
err = dockerCLI.ContainerStart(dockerCtx, containerID, types.ContainerStartOptions{})
if err != nil {
fmt.Println(err)
}
log.Printf("Adding the container (%s) to the circus network", containerID)
// get the circus network id
circusNetworkID, err = getCircusNetworkID(dockerCtx, dockerCLI)
if err != nil {
log.Println("error: could not get CircusNetworkID", err)
}
log.Printf("circus network ID: %s", circusNetworkID)
// connect the companion container to the circus network
connectContainerToNetwork(containerID, circusNetworkID)
log.Println("Container added to the circus network")
// Get IP Address of that container
inspectJSON, err := dockerCLI.ContainerInspect(dockerCtx, containerID)
if err != nil {
log.Println("inspectJsonErr: ", err)
}
fmt.Println("---")
fmt.Printf("%#v", inspectJSON.NetworkSettings.Networks)
fmt.Printf("companion IP: %#v", inspectJSON.NetworkSettings.Networks["circus"].IPAddress)
}
func generateSessionSalt() string {
return fmt.Sprintf("%d", time.Now().UnixNano())
}
// listDockerNetworks lists the docker networks
func listDockerNetworks(dockerCtx context.Context, dockerCLI *client.Client) ([]types.NetworkResource, error) {
// list the docker networks
networks, err := dockerCLI.NetworkList(dockerCtx, types.NetworkListOptions{})
if err != nil {
return nil, fmt.Errorf("network list err: %s", err)
}
return networks, nil
}
// searchDockerNetworkIDFromName returns the docker network ID using the given name
// to find it.
func searchDockerNetworkIDFromName(networks []types.NetworkResource, NetworkNameToFind string) (string, error) {
for _, network := range networks {
if network.Name == NetworkNameToFind {
return network.ID, nil
}
}
return "", fmt.Errorf("could not find the network id for the network %s: %s", NetworkNameToFind)
}
// connectContainerToNetwork inserts the container with the given ID into the
// network with the given ID
func connectContainerToNetwork(containerID string, networkID string) {
err := dockerCLI.NetworkConnect(dockerCtx, networkID, containerID, nil)
if err != nil {
log.Printf("Could not connect container %s to network %s: %s", containerID[:10], networkID[:10], err)
}
log.Println("connectContainerToNetwork err: ", err)
}
func getCircusNetworkID(dockerCtx context.Context, dockerCLI *client.Client) (string, error) {
networks, err := listDockerNetworks(dockerCtx, dockerCLI)
if err != nil {
return "", err
}
circusNetworkID, err := searchDockerNetworkIDFromName(networks, "circus")
if err != nil {
return "", err
}
return circusNetworkID, nil
}
|
