try rdns, add hostname column

main.go

@@ -33,6 +33,7 @@ type route struct {
 	UnreachableDuration time.Duration
 	UnreachableSince    time.Time
 	ReachableSince      time.Time
+	Hostname            string
 }
 
 func (r route) DurationUntilRounded(t time.Time) time.Duration {
@@ -98,6 +99,15 @@ func (rs *routeStats) add(rm rtnetlink.RouteMessage) {
 	r := rs.stats[key]
 	if r == nil {
 		r = &route{Dst: dst}
+		go func(r *route, rs *routeStats) {
+			names, err := net.LookupAddr(r.Dst.IP.String())
+			if err != nil || len(names) == 0 {
+				return
+			}
+			rs.Lock()
+			r.Hostname = strings.TrimRight(names[0], ".")
+			rs.Unlock()
+		}(r, rs)
 	}
 
 	r.Counter++
@@ -226,7 +236,7 @@ func render(w io.Writer, rs []route) error {
 			padding: 0.1em 2em;
 			font-family: monospace;
 		}
-		.dst {
+		.dst, .hostname {
 			text-align: left;
 		}
 		.unreachable {
@@ -236,7 +246,7 @@ func render(w io.Writer, rs []route) error {
 		table tr.noise {
 			display: none;
 		}
-		tbody tr:hover {
+		tbody tr:nth-child(n+2):hover {
 			background-color: silver;
 		}
 		#showAll:checked ~ table tr.noise {
@@ -259,9 +269,11 @@ func render(w io.Writer, rs []route) error {
 			<thead>
 				<tr>
 					<th>Net</th>
+					<th>Hostname</th>
 					<th colspan="3">Downtime</th>
 				</tr>
 				<tr>
+					<th></th>
 					<th></th>
 					<th>Counts</th>
 					<th>rel</th>
@@ -269,7 +281,7 @@ func render(w io.Writer, rs []route) error {
 				</tr>
 			</thead>
 			<tbody>
-				<tr><td colspan="4"><hr/></td></tr>
+				<tr><td colspan="5"><hr/></td></tr>
 				{{- $now := .Now -}}
 				{{- range .R }}
 				<tr class="
@@ -277,6 +289,7 @@ func render(w io.Writer, rs []route) error {
 				{{- if .Noise $now }} noise{{end -}}
 				">
 					<td class="dst">{{.Dst}}</td>
+					<td class="hostname">{{with .Hostname}}<a href="//{{.}}" target="_blank">{{.}}</a>{{end}}</td>
 					<td class="counter">{{.Counter}}</td>
 					<td class="downtime">{{.Downtime $now | printf "%.3f%%"}}</td>
 					<td class="duration">{{.DurationUntilRounded $now}}</td>