tests: sample snmp test to check infra

Simple test which creates a router running snmp and bgpd and
checks we can read the correct bgpVersion using snmp.

Signed-off-by: Pat Ruddy <pat@voltanet.io>

tests/topotests/simple-snmp-test/r1/bgpd.conf

@@ -0,0 +1,6 @@
+log file /tmp/bgpd.log debugging
+!
+router bgp 100
+ bgp router-id 1.1.1.1
+
+agentx

tests/topotests/simple-snmp-test/r1/isisd.conf

@@ -0,0 +1,46 @@
+log stdout debugging
+!
+debug isis route-events
+debug isis events
+!
+interface r1-eth0
+  ip router isis ISIS1
+  ipv6 router isis ISIS1
+  isis circuit-type level-1
+  no isis hello padding
+  isis hello-interval 1
+  isis hello-multiplier 3
+  isis network point-to-point
+!
+interface r1-eth1
+  ip router isis ISIS1
+  ipv6 router isis ISIS1
+  isis circuit-type level-1
+  no isis hello padding
+  isis hello-interval 1
+  isis hello-multiplier 3
+  isis network point-to-point
+!
+interface r1-eth2
+  ip router isis ISIS1
+  ipv6 router isis ISIS1
+  isis circuit-type level-1
+  no isis hello padding
+  isis hello-interval 1
+  isis hello-multiplier 3
+  isis network point-to-point
+!
+interface lo
+  ip router isis ISIS1
+  ipv6 router isis ISIS1
+  isis circuit-type level-1
+  isis passive
+  no isis hello padding
+!
+router isis ISIS1
+ net 01.1111.0000.0000.0001.00
+ is-type level-1
+ topology ipv6-unicast
+!
+line vty
+!

tests/topotests/simple-snmp-test/r1/snmpd.conf

@@ -0,0 +1,15 @@
+agentAddress udp:1.1.1.1:161
+
+com2sec public 1.1.1.1 public
+
+group public_group v1 public
+group public_group v2c public
+
+access public_group "" any noauth prefix all all none
+
+view all included .1
+
+iquerySecName frr
+rouser frr
+
+master agentx

tests/topotests/simple-snmp-test/r1/zebra.conf

@@ -0,0 +1,22 @@
+log file zebra.log
+!
+interface r1-eth0
+ ip address 192.168.12.12/24
+ ipv6 address 2000:1:1:12::12/64 
+!
+interface r1-eth1
+ ip address 192.168.13.13/24
+ ipv6 address 2000:1:1:13::13/64 
+!
+interface r1-eth2
+ ip address 192.168.14.14/24
+ ipv6 address 2000:1:1:14::14/64 
+!
+!
+interface lo
+ ip address 1.1.1.1/32
+ ipv6 address 2000:1:1:1::1/128
+!
+!
+!
+line vty

tests/topotests/simple-snmp-test/test_simple_snmp.py

@@ -0,0 +1,132 @@
+#!/usr/bin/env python
+
+#
+# test_simple_snmp.py
+# Part of NetDEF Topology Tests
+#
+# Copyright (c) 2020 by Volta Networks
+#
+# Permission to use, copy, modify, and/or distribute this software
+# for any purpose with or without fee is hereby granted, provided
+# that the above copyright notice and this permission notice appear
+# in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
+# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+#
+
+"""
+test_bgp_simple snmp.py: Test snmp infrastructure.
+"""
+
+import os
+import sys
+import json
+from functools import partial
+from time import sleep
+import pytest
+
+# Save the Current Working Directory to find configuration files.
+CWD = os.path.dirname(os.path.realpath(__file__))
+sys.path.append(os.path.join(CWD, "../"))
+
+# pylint: disable=C0413
+# Import topogen and topotest helpers
+from lib import topotest
+from lib.topogen import Topogen, TopoRouter, get_topogen
+from lib.topolog import logger
+from lib.snmptest import SnmpTester
+
+# Required to instantiate the topology builder class.
+from mininet.topo import Topo
+
+
+class TemplateTopo(Topo):
+    "Test topology builder"
+
+    def build(self, *_args, **_opts):
+        "Build function"
+        tgen = get_topogen(self)
+
+        # This function only purpose is to define allocation and relationship
+        # between routers, switches and hosts.
+        #
+        #
+        # Create routers
+        tgen.add_router("r1")
+
+        # r1-eth0
+        switch = tgen.add_switch("s1")
+        switch.add_link(tgen.gears["r1"])
+
+        # r1-eth1
+        switch = tgen.add_switch("s2")
+        switch.add_link(tgen.gears["r1"])
+
+        # r1-eth2
+        switch = tgen.add_switch("s3")
+        switch.add_link(tgen.gears["r1"])
+
+
+def setup_module(mod):
+    "Sets up the pytest environment"
+    # This function initiates the topology build with Topogen...
+    tgen = Topogen(TemplateTopo, mod.__name__)
+    # ... and here it calls Mininet initialization functions.
+    tgen.start_topology()
+
+    r1 = tgen.gears["r1"]
+
+    router_list = tgen.routers()
+
+    # For all registred routers, load the zebra configuration file
+    for rname, router in router_list.items():
+        router.load_config(
+            TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
+        )
+        router.load_config(
+            TopoRouter.RD_ISIS, os.path.join(CWD, "{}/isisd.conf".format(rname))
+        )
+        router.load_config(
+            TopoRouter.RD_BGP,
+            os.path.join(CWD, "{}/bgpd.conf".format(rname)),
+            "-M snmp",
+        )
+        router.load_config(
+            TopoRouter.RD_SNMP,
+            os.path.join(CWD, "{}/snmpd.conf".format(rname)),
+            "-Le -Ivacm_conf,usmConf,iquery -V -DAgentX,trap",
+        )
+
+    # After loading the configurations, this function loads configured daemons.
+    tgen.start_router()
+
+
+def teardown_module(mod):
+    "Teardown the pytest environment"
+    tgen = get_topogen()
+
+    # This function tears down the whole topology.
+    tgen.stop_topology()
+
+
+def test_r1_bgp_version():
+    "Wait for protocol convergence"
+    tgen = get_topogen()
+
+    #tgen.mininet_cli()
+    r1 = tgen.net.get("r1")
+    r1_snmp = SnmpTester(r1, "1.1.1.1", "public", "2c")
+    assert r1_snmp.test_oid("bgpVersin", None)
+    assert r1_snmp.test_oid("bgpVersion", "10")
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))