From ecce458caaf09c6f4fc2656077d70f8587d81cbc Mon Sep 17 00:00:00 2001
From: Dirk Alders <dirk@mount-mockery.de>
Date: Mon, 11 Sep 2023 20:48:25 +0200
Subject: [PATCH] dnsleases pimped - joined output of leases file and ip nx

---
 dnsleases | 89 ++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 78 insertions(+), 11 deletions(-)

diff --git a/dnsleases b/dnsleases
index ad8c243..41273e9 100755
--- a/dnsleases
+++ b/dnsleases
@@ -1,14 +1,81 @@
-#!/bin/bash
+#!/bin/python3
+#
+import subprocess
+import time
 
-LEASES_FILE=/var/lib/misc/dnsmasq.leases
+class host(object):
+    def __init__(self):
+        self.mac = ''
+        self.ip = ''
+        self.vlan = 0
+        self.state = ''
+        self.hostname = ''
+        self.lease_tm = 0
 
-print_vlan()
-{
-    echo "Hosts in VLAN $1"
-    grep 192.168.$1. $LEASES_FILE | sed 's/^/  * /'
-}
+    def __str__(self):
+        return "%-16s - %17s - %-10s - %15s - %s" % (self.ip, self.mac, self.state, time.asctime(time.localtime(self.lease_tm)), self.hostname)
 
-for vl in 20 30 40 50 60 90
-do
-    print_vlan $vl
-done
+
+class hostlist(dict):
+    def __init__(self):
+        dict.__init__(self)
+
+    def append(self, host):
+        if host.mac in self:
+            if host.state < self[host.mac].state:
+                self[host.mac] = host
+        else:
+            self[host.mac] = host
+
+    def __str__(self):
+        rv = ""
+        for key in self:
+            rv += str(self[key]) + '\n'
+        return rv
+
+
+hl = hostlist()
+
+#
+# ip n
+#
+for line in subprocess.check_output(['ip', 'n']).decode('utf-8').split('\n'):
+    data = line.split(" ")
+    h = host()
+    h.ip = data[0]
+    try:
+        h.vlan = int(h.ip.split('.')[2])
+    except IndexError:
+        pass
+    if len(data) == 6:
+        h. mac = data[4]
+        h.state = data[5]
+    else:
+        continue
+    hl.append(h)
+
+#
+# leases
+#
+with open('/var/lib/misc/dnsmasq.leases', 'r') as fh:
+    for line in fh.read().split('\n'):
+        data = line.split(' ')
+        if len(data) == 5:
+            h = hl.get(data[1], host())
+            h.lease_tm = int(data[0])
+            h.mac = data[1]
+            h.ip = data[2]
+            try:
+                h.vlan = int(h.ip.split('.')[2])
+            except IndexError:
+                pass
+            h.hostname = data[3]
+            if h.mac not in hl:
+                hl.append(h)
+
+for vlan in [20, 30, 40, 50, 60, 90]:
+    print("Hosts in VLAN %d" % vlan)
+    for host in hl.values():
+        if host.vlan == vlan:
+            print("  *", host)
+    print()