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package main
import (
"fmt"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/network"
"time"
)
const (
VPNNetworkName = "circus-vpnnet"
)
type ChallengeContainer struct {
Challenge *Challenge
ContainerID string
IP string
}
// Starts the container and returns its address and containerID if successful
func (cc ChallengeContainer) startContainer() (address string, containerID string, err error) {
// Set up our context and Docker CLI connection
setupContext()
setupDockerCLI()
// Set up network
err = setupNetwork()
if err != nil {
return "", "", err
}
// Create container
resp, err := dockerCli.ContainerCreate(dockerCtx, &container.Config{
Image: cc.Challenge.Container,
Env: []string{fmt.Sprintf("FLAG=%s", cc.Challenge.Flag)},
Tty: false,
}, nil, &network.NetworkingConfig{
EndpointsConfig: map[string]*network.EndpointSettings{
VPNNetworkName: {
NetworkID: vpnNetworkID,
},
},
}, "")
if err != nil {
return "", "", err
}
// Start container
err = dockerCli.ContainerStart(dockerCtx, resp.ID, types.ContainerStartOptions{})
if err != nil {
return "", "", err
}
// Get IP Address of that container
inspectJSON, err := dockerCli.ContainerInspect(dockerCtx, resp.ID)
if err != nil {
return "", "", err
}
// Return IP, Container ID and error
return inspectJSON.NetworkSettings.Networks[VPNNetworkName].IPAddress, resp.ID,nil
}
// Stops the container with a timeout of one second
func (cc ChallengeContainer) stopContainer() {
timeout := time.Second
dockerCli.ContainerStop(dockerCtx, cc.ContainerID, &timeout)
}
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