6Gen-optimization/aliases-lpm.py at main · xuanling22/6Gen-optimization · GitHub

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#!/usr/bin/env python
'''
python aliases-lpm.py -a [aliasedprefix.txt] -n [nap.txt] -i [input filename] --non-aliased-result [non-aliased.txt] --aliased-result [aliased.txt]
python aliases-lpm.py -a [aliasedprefix.txt] -n [nap.txt] -i [input filename] --simple
'''
from __future__ import print_function

import argparse
import sys

try:
    import SubnetTree
except Exception as e:
    print(e, file=sys.stderr)
    print("Use `pip install pysubnettree` to install the required module", file=sys.stderr)
    sys.exit(1)


def read_non_aliased(tree, fh):
    return fill_tree(tree, fh, ",0")

def read_aliased(tree, fh):
    return fill_tree(tree, fh, ",1")

def fill_tree(tree, fh, suffix):
    for line in fh:
        line = line.strip()
        try:
            tree[line] = line + suffix
        except ValueError as e:
            print("Skipped line '" + line + "'", file=sys.stderr)
    return tree


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("-a", "--aliased-file", required=True, type=argparse.FileType('r'), help="File containing aliased prefixes")
    parser.add_argument("-n", "--non-aliased-file", required=True, type=argparse.FileType('r'), help="File containing non-aliased prefixes")
    parser.add_argument("-i", "--ip-address-file", required=True, type=argparse.FileType('r'), help="File containing IP addresses to be matched against (non-)aliased prefixes")
    parser.add_argument("--non-aliased-result", type=str, help="File")
    parser.add_argument("--aliased-result", type=str, help="File")
    parser.add_argument("--simple", action="store_true", help="File")
    args = parser.parse_args()

    # Store aliased and non-aliased prefixes in a single subnet tree
    tree = SubnetTree.SubnetTree()

    # Read aliased and non-aliased prefixes
    tree = read_aliased(tree, args.aliased_file)
    tree = read_non_aliased(tree, args.non_aliased_file)
    skipcount = 0
    if args.simple:
        aliased_count = 0
        non_count = 0
        for line in args.ip_address_file:
            line = line.strip()
            if line[0] == '#': continue
            try:
                if line in tree:
                    isAliased = tree[line]
                    if isAliased[-1]=='1':
                        aliased_count += 1
                    elif isAliased[-1]=='0':
                        non_count += 1
                    else:
                        print(line + isAliased)
                        skipcount += 1
                else:
                    skipcount += 1
            except KeyError as e:
                print("Skipped line '" + line + "'", file=sys.stderr)
        print('aliased {} non-aliased {} skip {}'.format(aliased_count, non_count, skipcount))
        exit(0)
    f_non = open(args.non_aliased_result, 'w')
    f_alias = open(args.aliased_result, 'w')
    # Read IP address file, match each address to longest prefix and print output
    for line in args.ip_address_file:
        line = line.strip()
        try:
            #if line in tree:
            #    f_alias.write(line + '\n')
            #else:
            #    f_non.write(line + '\n')
            if line in tree:
                isAliased = tree[line]
                if isAliased[-1]=='1':
                    f_alias.write(line + '\n')
                elif isAliased[-1]=='0':
                    f_non.write(line + '\n')
                else:
                    print(line + isAliased)
                    skipcount += 1
            else:
                skipcount += 1

        except KeyError as e:
            print("Skipped line '" + line + "'", file=sys.stderr)
    f_non.close()
    f_alias.close()
    print('skip count {}'.format(skipcount))
if __name__ == "__main__":
    main()