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listid.go
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listid.go
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// Copyright © 2015-2016 Platina Systems, Inc. All rights reserved.
// Use of this source code is governed by the GPL-2 license described in the
// LICENSE file.
package listid
import (
"fmt"
"io/ioutil"
"github.com/platinasystems/goes/cmd/ip/internal/options"
"github.com/platinasystems/goes/lang"
"github.com/platinasystems/goes/internal/nl"
"github.com/platinasystems/goes/internal/nl/rtnl"
)
type Command struct{}
func (Command) String() string { return "list-id" }
func (Command) Usage() string {
return `ip netns list-id`
}
func (Command) Apropos() lang.Alt {
return lang.Alt{
lang.EnUS: "list network namespace identifiers",
}
}
func (Command) Man() lang.Alt {
return lang.Alt{
lang.EnUS: `
SEE ALSO
ip man netns || ip netns -man
man ip || ip -man`,
}
}
func (Command) Main(args ...string) error {
_, args = options.New(args)
if len(args) > 0 {
return fmt.Errorf("%v: unexpected", args)
}
namebyid := make(map[int32]string)
sock, err := nl.NewSock()
if err != nil {
return err
}
defer sock.Close()
sr := nl.NewSockReceiver(sock)
varRunNetns, err := ioutil.ReadDir(rtnl.VarRunNetns)
if err == nil {
for _, fi := range varRunNetns {
nsid, err := rtnl.Nsid(sr, fi.Name())
if err == nil && nsid >= 0 {
namebyid[nsid] = fi.Name()
}
}
}
req, err := nl.NewMessage(
nl.Hdr{
Type: rtnl.RTM_GETNSID,
Flags: nl.NLM_F_REQUEST | nl.NLM_F_DUMP,
},
rtnl.RtGenMsg{
Family: rtnl.AF_UNSPEC,
},
)
if err != nil {
return err
}
return sr.UntilDone(req, func(b []byte) {
var netnsa rtnl.Netnsa
t := nl.HdrPtr(b).Type
if t != rtnl.RTM_DELNSID && t != rtnl.RTM_NEWNSID {
return
}
if n, err := netnsa.Write(b); err != nil || n == 0 {
return
}
if t == rtnl.RTM_DELNSID {
fmt.Print("Deleted ")
}
nsid := int32(-1)
if val := netnsa[rtnl.NETNSA_NSID]; len(val) > 0 {
nsid = nl.Int32(val)
}
fmt.Print(nsid)
if name, found := namebyid[nsid]; found {
fmt.Print(": ", name)
}
fmt.Println()
})
}