func main() {
flag.Parse()
// Attempt to discover a specific neighbor by IP address
if *ipFlag != "" {
n, err := neighbor.Lookup(net.ParseIP(*ipFlag))
if err != nil {
log.Fatal(err)
}
printNeighbor(n)
return
}
// Determine network address family by flags
var family neighbor.Family
switch {
case *ip4Flag:
family = neighbor.FamilyIPv4
case *ip6Flag:
family = neighbor.FamilyIPv6
default:
family = neighbor.FamilyUnspec
}
// Attempt to show neighbors with matching family
neighbors, err := neighbor.Show(family)
if err != nil {
log.Fatal(err)
}
for _, n := range neighbors {
printNeighbor(n)
}
}
func main() {
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
// Retrieve host only for neighbor lookup
host, _, err := net.SplitHostPort(r.RemoteAddr)
if err != nil {
log.Println(err)
return
}
// Attempt to find neighbor
n, err := neighbor.Lookup(net.ParseIP(host))
if err != nil {
log.Println(err)
return
}
// Log neighbor and return information to client
msg := fmt.Sprintf("%s -> %s [%s] %s",
n.IP,
n.HardwareAddr,
n.State,
n.Flags,
)
log.Println(msg)
w.Write([]byte(msg))
})
// Serve HTTP on specified host
if err := http.ListenAndServe(*hostFlag, nil); err != nil {
log.Fatal(err)
}
}