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network.go
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network.go
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package main
import (
"fmt"
"os"
"os/exec"
"strconv"
"time"
"github.com/sirupsen/logrus"
"github.com/vishvananda/netlink"
)
const suidNet = "unet"
func waitForIface() (netlink.Link, error) {
logrus.Debugf("Starting to wait for network interface")
start := time.Now()
for {
fmt.Printf(".")
if time.Since(start) > 5*time.Second {
fmt.Printf("\n")
return nil, fmt.Errorf("failed to find veth interface in 5 seconds")
}
// get list of all interfaces
lst, err := netlink.LinkList()
if err != nil {
fmt.Printf("\n")
return nil, err
}
for _, l := range lst {
// if we found "veth" interface - it's time to continue setup
if l.Type() == "veth" {
fmt.Printf("\n")
return l, nil
}
}
time.Sleep(100 * time.Millisecond)
}
}
func putIface(pid int) error {
logrus.Debugf("Putting veth interface into container")
cmd := exec.Command(suidNet, strconv.Itoa(pid))
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err := cmd.Run()
if err != nil {
return fmt.Errorf("unet: err: %v", err)
}
logrus.Debugf("Network setup done")
return nil
}
func setupIface(link netlink.Link, cfg Cfg) error {
// up loopback
lo, err := netlink.LinkByName("lo")
if err != nil {
return fmt.Errorf("lo interface: %v", err)
}
if err := netlink.LinkSetUp(lo); err != nil {
return fmt.Errorf("up veth: %v", err)
}
addr, err := netlink.ParseAddr(cfg.IP)
if err != nil {
return fmt.Errorf("parse IP: %v", err)
}
return netlink.AddrAdd(link, addr)
}