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iface.go
39 lines (32 loc) · 927 Bytes
/
iface.go
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// Copyright 2019 the u-root Authors. All rights reserved
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package dhclient
import (
"fmt"
"regexp"
"github.com/vishvananda/netlink"
)
// Interfaces takes an RE and returns a
// []netlink.Link that matches it, or an error. It is an error
// for the returned list to be empty.
func Interfaces(ifName string) ([]netlink.Link, error) {
ifRE, err := regexp.CompilePOSIX(ifName)
if err != nil {
return nil, err
}
ifnames, err := netlink.LinkList()
if err != nil {
return nil, fmt.Errorf("can not get list of link names: %v", err)
}
var filteredIfs []netlink.Link
for _, iface := range ifnames {
if ifRE.MatchString(iface.Attrs().Name) {
filteredIfs = append(filteredIfs, iface)
}
}
if len(filteredIfs) == 0 {
return nil, fmt.Errorf("no interfaces match %s", ifName)
}
return filteredIfs, nil
}