71 lines
2.9 KiB
Python
71 lines
2.9 KiB
Python
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import networkx as nx
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import yaml
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from networkx.drawing.nx_agraph import to_agraph
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class Topology(object):
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def __init__(self):
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self.G = nx.MultiGraph()
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def render(self):
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'''
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Summary:
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Builds a network topology from the topology.yaml file into memory, stored in a networkx Graph object.
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Once the networkx Graph object has been built, it's drawn and saved as topology.png.
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Nodes: network devices
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Edges: links between network devices
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Edge attributes: dict of attributes assigned to a specific edge
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'''
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topology_data = yaml.load(open('topology.yaml'), Loader=yaml.SafeLoader)
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for topology_name, topology_vars in topology_data.items():
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for node in topology_vars['nodes']:
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self.G.add_node(node)
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self.G.nodes[node]['shape'] = 'box'
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for edge_number, edge_attributes in topology_vars['edges'].items():
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self.G.add_edge(edge_attributes['a_end'], edge_attributes['b_end'])
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nx.set_edge_attributes(
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self.G,
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{
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(edge_attributes['a_end'],
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edge_attributes['b_end'],
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edge_attributes['edge_index']): edge_attributes
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}
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)
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for node1, node2, edge_attributes in self.G.edges(data=True):
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edge_attributes['label'] = f"""
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{edge_attributes['a_end']}
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{edge_attributes['a_end_ip']}, {edge_attributes['a_end_interface']}\n
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{edge_attributes['b_end']}
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{edge_attributes['b_end_ip']}, {edge_attributes['b_end_interface']}
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"""
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vis = to_agraph(self.G)
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vis.layout('dot')
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vis_path = 'topology/topology.png'
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vis.draw(vis_path)
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def get_dns_records(self):
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'''
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Summary:
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Creates & outputs Ubuntu DNS entries for each edge IP in the networkx Graph object.
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Enabling operators to easily visualise the path traffic has taken across a network.
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dom@upsrv01:~/Python/T2DNS$ traceroute 10.0.0.3 --resolve -I
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traceroute to 10.0.0.3 (10.0.0.3), 64 hops max
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1 192.168.0.249 (UBUNTU_eth0-->GigabitEthernet8_LAB-RELAY) 0.864ms 0.688ms 0.720ms
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2 10.0.0.3 (LAB-RELAY_GigabitEthernet1-->GigabitEthernet8_LAB-897VA) 1.431ms 1.372ms 1.363ms
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'''
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records = {}
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print('Creating DNS records...')
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for node1, node2, edge_attributes in self.G.edges(data=True):
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records.update({edge_attributes['b_end_ip']: f"{node1}_{edge_attributes['a_end_interface']}-->{edge_attributes['b_end_interface']}_{node2}"})
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records.update({edge_attributes['a_end_ip']: f"{node2}_{edge_attributes['b_end_interface']}-->{edge_attributes['a_end_interface']}_{node1}"})
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for ip, record in records.items():
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print(f'{ip} {record}')
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