Sample script for mac to ipv6 translation

Useful for some generic applications where nodediscover
does not have full support, but must be used with care
as it doesn't guarantee the mac address is what we expect
it to be.

confluent_client/samples/nodeattrib_from_switch.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python
+
+# This is a sample python script for going through all observed mac addresses
+# and assuming they are BMC related and printing nodeattrib commands
+# for each node to access the bmc using the interface specified on the command
+# line
+
+# Not necessarily as useful if there may be mistakes in the
+# net.switch/net.switchport attributes, but a handy utility in a pinch when
+# you really know
+
+
+import confluent.client as cl
+import socket
+import struct
+c = cl.Command()
+macs = []
+interface = sys.argv[1]
+for mac in c.read('/networking/macs/by-mac/'):
+    macs.append(mac['item']['href'])
+for mac in macs:
+    macinfo = list(c.read('/networking/macs/by-mac/{0}'.format(mac)))[0]
+    if 'possiblenode' in macinfo and macinfo['possiblenode']:
+        if macinfo['macsonport'] > 1:
+            print('Ambiguous set of macs on port for ' + macinfo[
+                'possiblenode'])
+        prefix = int(mac.replace('-', '')[:6], 16) ^ 0b100000000000000000
+        prefix = prefix << 8
+        prefix |= 0xff
+        suffix = int(mac.replace('-', '')[6:], 16)
+        suffix |= 0xfe000000
+        rawn = struct.pack('!QLL', 0xfe80000000000000, prefix, suffix)
+        bmc = socket.inet_ntop(socket.AF_INET6, rawn)
+        print('nodeattrib {0} bmc={1}%{2}'.format(macinfo['possiblenode'],
+                                                  bmc, interface))