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netsetgo.go
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netsetgo.go
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package main
import (
"flag"
"fmt"
"net"
"os"
"code.cloudfoundry.org/guardian/kawasaki/netns"
"github.com/teddyking/netsetgo"
"github.com/teddyking/netsetgo/configurer"
"github.com/teddyking/netsetgo/device"
)
func main() {
var bridgeName, bridgeAddress, containerAddress, vethNamePrefix string
var pid int
flag.StringVar(&bridgeName, "bridgeName", "brg0", "Name to assign to bridge device")
flag.StringVar(&bridgeAddress, "bridgeAddress", "10.10.10.1/24", "Address to assign to bridge device (CIDR notation)")
flag.StringVar(&vethNamePrefix, "vethNamePrefix", "veth", "Name prefix for veth devices")
flag.StringVar(&containerAddress, "containerAddress", "10.10.10.2/24", "Address to assign to the container (CIDR notation)")
flag.IntVar(&pid, "pid", 0, "pid of a process in the container's network namespace")
flag.Parse()
if pid == 0 {
fmt.Println("ERROR - netsetgo needs a pid")
os.Exit(1)
}
bridgeCreator := device.NewBridge()
vethCreator := device.NewVeth()
netnsExecer := &netns.Execer{}
hostConfigurer := configurer.NewHostConfigurer(bridgeCreator, vethCreator)
containerConfigurer := configurer.NewContainerConfigurer(netnsExecer)
netset := netsetgo.New(hostConfigurer, containerConfigurer)
bridgeIP, bridgeSubnet, err := net.ParseCIDR(bridgeAddress)
check(err)
containerIP, _, err := net.ParseCIDR(containerAddress)
check(err)
netConfig := netsetgo.NetworkConfig{
BridgeName: bridgeName,
BridgeIP: bridgeIP,
ContainerIP: containerIP,
Subnet: bridgeSubnet,
VethNamePrefix: vethNamePrefix,
}
check(netset.ConfigureHost(netConfig, pid))
check(netset.ConfigureContainer(netConfig, pid))
}
func check(err error) {
if err != nil {
fmt.Printf("ERROR - %s\n", err.Error())
os.Exit(1)
}
}