added utility for extracting a relevant snmp community string

inventory_provider/juniper.py

@@ -339,3 +339,13 @@ def local_interfaces(
                 mask = a['netmask']
             yield ipaddress.ip_interface('%s/%s' % (addr, mask))
 
+
+def snmp_community_string(netconf_config):
+    my_addressess = list([i.ip for i in local_interfaces()])
+    for community in netconf_config.xpath('//configuration/snmp/community'):
+        for subnet in community.xpath('./clients/name/text()'):
+            allowed_network = ipaddress.ip_network(subnet, strict=False)
+            for me in my_addressess:
+                if me in allowed_network:
+                    return community.xpath('./name/text()')[0]
+    return None

test/per_router/test_juniper_data.py

@@ -98,3 +98,20 @@ def test_bgp_list(netconf_doc):
 
     routes = list(juniper.list_bgp_routes(netconf_doc))
     jsonschema.validate(routes, schema)
+
+
+NETIFACES_TEST_DATA = {
+    'lo0':  {2: [{'addr': '127.0.0.1', 'netmask': '255.0.0.0', 'peer': '127.0.0.1'}],
+             30: [{'addr': '::1', 'netmask': 'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128', 'peer': '::1', 'flags': 0},
+                 {'addr': 'fe80::1%lo0', 'netmask': 'ffff:ffff:ffff:ffff::/64', 'flags': 0}]},
+    'eth0': {18: [{'addr': '78:4f:43:76:73:ba'}],
+             2: [{'addr': '83.97.92.239', 'netmask': '255.255.252.0', 'broadcast': '83.97.95.255'}],
+             30: [{'addr': 'fe80::250:56ff:fea1:8340', 'netmask': 'ffff:ffff:ffff:ffff::/64', 'flags': 1024},
+                 {'addr': '2001:798:3::104', 'netmask': 'ffff:ffff:ffff:ffff::/64', 'flags': 1088}]}
+}
+
+
+def test_snmp_community_string(mocker, netconf_doc):
+    mocker.patch('netifaces.interfaces', lambda: NETIFACES_TEST_DATA.keys())
+    mocker.patch('netifaces.ifaddresses', lambda n: NETIFACES_TEST_DATA[n])
+    assert juniper.snmp_community_string(netconf_doc) == '0pBiFbD'