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| -rw-r--r-- | tests/topotests/lib/topojson.py | 405 |
1 files changed, 405 insertions, 0 deletions
diff --git a/tests/topotests/lib/topojson.py b/tests/topotests/lib/topojson.py new file mode 100644 index 0000000..901e4f6 --- /dev/null +++ b/tests/topotests/lib/topojson.py @@ -0,0 +1,405 @@ +# SPDX-License-Identifier: ISC +# +# Modified work Copyright (c) 2019 by VMware, Inc. ("VMware") +# Original work Copyright (c) 2018 by Network Device Education +# Foundation, Inc. ("NetDEF") +# + +import json +import ipaddress +import os +from collections import OrderedDict +from copy import deepcopy +from re import search as re_search + +import pytest + +from lib.bgp import create_router_bgp +from lib.common_config import ( + create_bgp_community_lists, + create_interfaces_cfg, + create_prefix_lists, + create_route_maps, + create_static_routes, + create_vrf_cfg, + load_config_to_routers, + start_topology, + topo_daemons, + number_to_column, +) +from lib.ospf import create_router_ospf +from lib.pim import ( + create_igmp_config, + create_pim_config, + create_mld_config, +) +from lib.topolog import logger + + +def build_topo_from_json(tgen, topo=None): + """ + Reads configuration from JSON file. Adds routers, creates interface + names dynamically and link routers as defined in JSON to create + topology. Assigns IPs dynamically to all interfaces of each router. + * `tgen`: Topogen object + * `topo`: json file data, or use tgen.json_topo if None + """ + if topo is None: + topo = tgen.json_topo + + router_list = sorted( + topo["routers"].keys(), key=lambda x: int(re_search(r"\d+", x).group(0)) + ) + + switch_list = [] + if "switches" in topo: + switch_list = sorted( + topo["switches"].keys(), key=lambda x: int(re_search(r"\d+", x).group(0)) + ) + + listRouters = sorted(router_list[:]) + listSwitches = sorted(switch_list[:]) + listAllRouters = deepcopy(listRouters) + dictSwitches = {} + + for routerN in router_list: + logger.info("Topo: Add router {}".format(routerN)) + tgen.add_router(routerN) + + for switchN in switch_list: + logger.info("Topo: Add switch {}".format(switchN)) + dictSwitches[switchN] = tgen.add_switch(switchN) + + if "ipv4base" in topo: + ipv4Next = ipaddress.IPv4Address(topo["link_ip_start"]["ipv4"]) + ipv4Step = 2 ** (32 - topo["link_ip_start"]["v4mask"]) + if topo["link_ip_start"]["v4mask"] < 32: + ipv4Next += 1 + if "ipv6base" in topo: + ipv6Next = ipaddress.IPv6Address(topo["link_ip_start"]["ipv6"]) + ipv6Step = 2 ** (128 - topo["link_ip_start"]["v6mask"]) + if topo["link_ip_start"]["v6mask"] < 127: + ipv6Next += 1 + for router in listRouters: + topo["routers"][router]["nextIfname"] = 0 + + router_count = 0 + while listRouters != []: + curRouter = listRouters.pop(0) + # Physical Interfaces + if "links" in topo["routers"][curRouter]: + for destRouterLink, data in sorted( + topo["routers"][curRouter]["links"].items() + ): + currRouter_lo_json = topo["routers"][curRouter]["links"][destRouterLink] + # Loopback interfaces + if "type" in data and data["type"] == "loopback": + router_count += 1 + if ( + "ipv4" in currRouter_lo_json + and currRouter_lo_json["ipv4"] == "auto" + ): + currRouter_lo_json["ipv4"] = "{}{}.{}/{}".format( + topo["lo_prefix"]["ipv4"], + router_count, + number_to_column(curRouter), + topo["lo_prefix"]["v4mask"], + ) + if ( + "ipv6" in currRouter_lo_json + and currRouter_lo_json["ipv6"] == "auto" + ): + currRouter_lo_json["ipv6"] = "{}{}:{}/{}".format( + topo["lo_prefix"]["ipv6"], + router_count, + number_to_column(curRouter), + topo["lo_prefix"]["v6mask"], + ) + + if "-" in destRouterLink: + # Spliting and storing destRouterLink data in tempList + tempList = destRouterLink.split("-") + + # destRouter + destRouter = tempList.pop(0) + + # Current Router Link + tempList.insert(0, curRouter) + curRouterLink = "-".join(tempList) + else: + destRouter = destRouterLink + curRouterLink = curRouter + + if destRouter in listRouters: + currRouter_link_json = topo["routers"][curRouter]["links"][ + destRouterLink + ] + destRouter_link_json = topo["routers"][destRouter]["links"][ + curRouterLink + ] + + # Assigning name to interfaces + currRouter_link_json["interface"] = "{}-{}-eth{}".format( + curRouter, destRouter, topo["routers"][curRouter]["nextIfname"] + ) + destRouter_link_json["interface"] = "{}-{}-eth{}".format( + destRouter, curRouter, topo["routers"][destRouter]["nextIfname"] + ) + + # add link interface + destRouter_link_json["peer-interface"] = "{}-{}-eth{}".format( + curRouter, destRouter, topo["routers"][curRouter]["nextIfname"] + ) + currRouter_link_json["peer-interface"] = "{}-{}-eth{}".format( + destRouter, curRouter, topo["routers"][destRouter]["nextIfname"] + ) + + topo["routers"][curRouter]["nextIfname"] += 1 + topo["routers"][destRouter]["nextIfname"] += 1 + + # Linking routers to each other as defined in JSON file + tgen.gears[curRouter].add_link( + tgen.gears[destRouter], + topo["routers"][curRouter]["links"][destRouterLink][ + "interface" + ], + topo["routers"][destRouter]["links"][curRouterLink][ + "interface" + ], + ) + + # IPv4 + if "ipv4" in currRouter_link_json: + if currRouter_link_json["ipv4"] == "auto": + currRouter_link_json["ipv4"] = "{}/{}".format( + ipv4Next, topo["link_ip_start"]["v4mask"] + ) + destRouter_link_json["ipv4"] = "{}/{}".format( + ipv4Next + 1, topo["link_ip_start"]["v4mask"] + ) + ipv4Next += ipv4Step + # IPv6 + if "ipv6" in currRouter_link_json: + if currRouter_link_json["ipv6"] == "auto": + currRouter_link_json["ipv6"] = "{}/{}".format( + ipv6Next, topo["link_ip_start"]["v6mask"] + ) + destRouter_link_json["ipv6"] = "{}/{}".format( + ipv6Next + 1, topo["link_ip_start"]["v6mask"] + ) + ipv6Next = ipaddress.IPv6Address(int(ipv6Next) + ipv6Step) + + logger.debug( + "Generated link data for router: %s\n%s", + curRouter, + json.dumps( + topo["routers"][curRouter]["links"], indent=4, sort_keys=True + ), + ) + + switch_count = 0 + add_switch_to_topo = [] + while listSwitches != []: + curSwitch = listSwitches.pop(0) + # Physical Interfaces + if "links" in topo["switches"][curSwitch]: + for destRouterLink, data in sorted( + topo["switches"][curSwitch]["links"].items() + ): + # Loopback interfaces + if "dst_node" in data: + destRouter = data["dst_node"] + + elif "-" in destRouterLink: + # Spliting and storing destRouterLink data in tempList + tempList = destRouterLink.split("-") + # destRouter + destRouter = tempList.pop(0) + else: + destRouter = destRouterLink + + if destRouter in listAllRouters: + topo["routers"][destRouter]["links"][curSwitch] = deepcopy( + topo["switches"][curSwitch]["links"][destRouterLink] + ) + + # Assigning name to interfaces + topo["routers"][destRouter]["links"][curSwitch][ + "interface" + ] = "{}-{}-eth{}".format( + destRouter, curSwitch, topo["routers"][destRouter]["nextIfname"] + ) + + topo["switches"][curSwitch]["links"][destRouter][ + "interface" + ] = "{}-{}-eth{}".format( + curSwitch, destRouter, topo["routers"][destRouter]["nextIfname"] + ) + + topo["routers"][destRouter]["nextIfname"] += 1 + + # Add links + dictSwitches[curSwitch].add_link( + tgen.gears[destRouter], + topo["switches"][curSwitch]["links"][destRouter]["interface"], + topo["routers"][destRouter]["links"][curSwitch]["interface"], + ) + + # IPv4 + if "ipv4" in topo["routers"][destRouter]["links"][curSwitch]: + if ( + topo["routers"][destRouter]["links"][curSwitch]["ipv4"] + == "auto" + ): + topo["routers"][destRouter]["links"][curSwitch][ + "ipv4" + ] = "{}/{}".format( + ipv4Next, topo["link_ip_start"]["v4mask"] + ) + ipv4Next += 1 + # IPv6 + if "ipv6" in topo["routers"][destRouter]["links"][curSwitch]: + if ( + topo["routers"][destRouter]["links"][curSwitch]["ipv6"] + == "auto" + ): + topo["routers"][destRouter]["links"][curSwitch][ + "ipv6" + ] = "{}/{}".format( + ipv6Next, topo["link_ip_start"]["v6mask"] + ) + ipv6Next = ipaddress.IPv6Address(int(ipv6Next) + ipv6Step) + + logger.debug( + "Generated link data for router: %s\n%s", + curRouter, + json.dumps( + topo["routers"][curRouter]["links"], indent=4, sort_keys=True + ), + ) + + +def linux_intf_config_from_json(tgen, topo=None): + """Configure interfaces from linux based on topo.""" + if topo is None: + topo = tgen.json_topo + + routers = topo["routers"] + for rname in routers: + router = tgen.net[rname] + links = routers[rname]["links"] + for rrname in links: + link = links[rrname] + if rrname == "lo": + lname = "lo" + else: + lname = link["interface"] + if "ipv4" in link: + router.cmd_raises("ip addr add {} dev {}".format(link["ipv4"], lname)) + if "ipv6" in link: + router.cmd_raises( + "ip -6 addr add {} dev {}".format(link["ipv6"], lname) + ) + + +def build_config_from_json(tgen, topo=None, save_bkup=True): + """ + Reads initial configuraiton from JSON for each router, builds + configuration and loads its to router. + + * `tgen`: Topogen object + * `topo`: json file data, or use tgen.json_topo if None + """ + + func_dict = OrderedDict( + [ + ("vrfs", create_vrf_cfg), + ("ospf", create_router_ospf), + ("links", create_interfaces_cfg), + ("static_routes", create_static_routes), + ("prefix_lists", create_prefix_lists), + ("bgp_community_list", create_bgp_community_lists), + ("route_maps", create_route_maps), + ("pim", create_pim_config), + ("igmp", create_igmp_config), + ("mld", create_mld_config), + ("bgp", create_router_bgp), + ] + ) + + if topo is None: + topo = tgen.json_topo + + data = topo["routers"] + for func_type in func_dict.keys(): + logger.info("Checking for {} configuration in input data".format(func_type)) + + func_dict.get(func_type)(tgen, data, build=True) + + routers = sorted(topo["routers"].keys()) + result = load_config_to_routers(tgen, routers, save_bkup) + if not result: + logger.info("build_config_from_json: failed to configure topology") + assert False + + logger.info( + "Built config now clearing ospf neighbors as that router-id might not be what is used" + ) + for ospf in ["ospf", "ospf6"]: + for router in data: + if ospf not in data[router]: + continue + + r = tgen.gears[router] + if ospf == "ospf": + r.vtysh_cmd("clear ip ospf process") + else: + r.vtysh_cmd("clear ipv6 ospf6 process") + + +def create_tgen_from_json(testfile, json_file=None): + """Create a topogen object given a testfile. + + - `testfile` : The path to the testfile. + - `json_file` : The path to the json config file. If None the pathname is derived + from the `testfile` first by trying to replace `.py` by `.json` and if that isn't + present then by removing `test_` prefix as well. + """ + from lib.topogen import Topogen # Topogen imports this module too + + thisdir = os.path.dirname(os.path.realpath(testfile)) + basename = os.path.basename(testfile) + logger.debug("starting standard JSON based module setup for %s", basename) + + assert basename.startswith("test_") + assert basename.endswith(".py") + json_file = os.path.join(thisdir, basename[:-3] + ".json") + if not os.path.exists(json_file): + json_file = os.path.join(thisdir, basename[5:-3] + ".json") + assert os.path.exists(json_file) + with open(json_file, "r") as topof: + topo = json.load(topof) + + # Create topology + tgen = Topogen(lambda tgen: build_topo_from_json(tgen, topo), basename[:-3]) + tgen.json_topo = topo + return tgen + + +def setup_module_from_json(testfile, json_file=None): + """Do the standard module setup for JSON based test. + + * `testfile` : The path to the testfile. The name is used to derive the json config + file name as well (removing `test_` prefix and replacing `.py` suffix with `.json` + """ + # Create topology object + tgen = create_tgen_from_json(testfile, json_file) + + # Start routers (and their daemons) + start_topology(tgen) + + # Configure routers + build_config_from_json(tgen) + assert not tgen.routers_have_failure() + + return tgen |