85 lines
1.8 KiB
Go
85 lines
1.8 KiB
Go
package main
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import (
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"fmt"
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"log"
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"net"
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"os"
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"strconv"
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"strings"
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"text/tabwriter"
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"github.com/docker/libcontainer"
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"github.com/docker/libcontainer/devices"
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"github.com/docker/libcontainer/mount/nodes"
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"github.com/docker/libcontainer/namespaces"
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_ "github.com/docker/libcontainer/namespaces/nsenter"
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)
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// nsenterExec exec's a process inside an existing container
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func nsenterExec(config *libcontainer.Config, args []string) {
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if err := namespaces.FinalizeSetns(config, args); err != nil {
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log.Fatalf("failed to nsenter: %s", err)
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}
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}
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// nsenterMknod runs mknod inside an existing container
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//
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// mknod <path> <type> <major> <minor>
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func nsenterMknod(config *libcontainer.Config, args []string) {
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if len(args) != 4 {
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log.Fatalf("expected mknod to have 4 arguments not %d", len(args))
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}
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t := rune(args[1][0])
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major, err := strconv.Atoi(args[2])
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if err != nil {
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log.Fatal(err)
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}
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minor, err := strconv.Atoi(args[3])
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if err != nil {
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log.Fatal(err)
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}
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n := &devices.Device{
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Path: args[0],
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Type: t,
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MajorNumber: int64(major),
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MinorNumber: int64(minor),
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}
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if err := nodes.CreateDeviceNode("/", n); err != nil {
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log.Fatal(err)
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}
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}
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// nsenterIp displays the network interfaces inside a container's net namespace
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func nsenterIp(config *libcontainer.Config, args []string) {
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interfaces, err := net.Interfaces()
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if err != nil {
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log.Fatal(err)
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}
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w := tabwriter.NewWriter(os.Stdout, 10, 1, 3, ' ', 0)
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fmt.Fprint(w, "NAME\tMTU\tMAC\tFLAG\tADDRS\n")
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for _, iface := range interfaces {
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addrs, err := iface.Addrs()
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if err != nil {
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log.Fatal(err)
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}
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o := []string{}
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for _, a := range addrs {
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o = append(o, a.String())
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}
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fmt.Fprintf(w, "%s\t%d\t%s\t%s\t%s\n", iface.Name, iface.MTU, iface.HardwareAddr, iface.Flags, strings.Join(o, ","))
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}
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w.Flush()
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}
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