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package main
import (
"net"
"github.com/vishvananda/netlink"
"fmt"
"log"
)
type AddrSet struct {
addrs map[string]net.IP
}
func (as *AddrSet) ScanInterface(iface string, family Family) error {
link, err := netlink.LinkByName(iface)
if err != nil {
return fmt.Errorf("netlink.LinkByName %v: %v", iface, err)
}
addrList, err := netlink.AddrList(link, int(family))
if err != nil {
return fmt.Errorf("netlink.AddrList %v: %v", link, err)
}
// set
as.addrs = make(map[string]net.IP)
for _, addr := range addrList {
as.applyLinkAddr(link, addr)
}
return nil
}
func (as *AddrSet) applyLinkAddr(link netlink.Link, addr netlink.Addr) {
linkUp := link.Attrs().Flags & net.FlagUp != 0
if addr.Scope >= int(netlink.SCOPE_LINK) {
return
}
as.applyAddr(addr.IP, linkUp)
}
// Update state for address
func (as *AddrSet) applyAddr(ip net.IP, up bool) {
if up {
log.Printf("update: up %v", ip)
as.addrs[ip.String()] = ip
} else {
log.Printf("update: down %v", ip)
delete(as.addrs, ip.String())
}
}
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