Need help with python code

Step 1: Download the compressed table DB_091803_v1.txt and test input file: IPlist.txt. Upload them to your Colab space using the code below.

from google.colab import files

uploaded = files.upload()

DB = next(iter(uploaded))

print(DB, "uploaded")

uploaded = files.upload()

IP_LIST = next(iter(uploaded))

print(IP_LIST, "uploaded")

Step 2: Develop the IP2AS tool - This tool maps an IP address to an AS. It uses static table address prefix to AS number collected from whois DB and BGP tables. This table is stored in a file and should be given to the tool as a parameter. It will perform longest prefix matching and will map the IP to an AS number. The tool should print out the longest prefix that the IP address is matched to, and the corresponding AS number.

Steps:

1. Put the set of IP addresses you want to map to ASes into the . You can list one IP address per line.

For example, look at IPlist.txt file, which contains the following:

 169.237.33.90 208.30.172.70

2. The has data about which address block belongs to a particular AS (look at DB_091803_v1.txt file, for example). The is constructed based on IRR database and BGP routing table.

3. Run ip2as and specify the and

For example, if you run your code, the output should look like the following:

169.237.0.0/16 1852 169.237.33.90 208.0.0.0/11 1239 208.30.172.70

My code is below:

def ip2as(ip, prefix_asn_list): ip_num = struct.unpack("!I", socket.inet_aton(ip))[0] max_prefix = 0 max_prefix_asn = None for prefix, asn in prefix_asn_list: if prefix <= ip_num < prefix + (1 << 32 - prefix.bit_length()): if prefix > max_prefix: max_prefix = prefix max_prefix_asn = asn return max_prefix, max_prefix_asn

def read_db_file(filename): prefix_asn_list = [] with open(filename) as f: for line in f: values = line.strip().split() if len(values) >= 2: prefix, asn = values[:2] try: prefix = struct.unpack("!I", socket.inet_aton(prefix))[0] prefix_asn_list.append((prefix, int(asn))) except OSError: print(f"Invalid IP address string: {prefix}") return prefix_asn_list

def main(db_filename, input_filename): prefix_asn_list = read_db_file(db_filename) with open(input_filename) as f: for line in f: ip = line.strip() prefix, asn = ip2as(ip, prefix_asn_list) prefix = socket.inet_ntoa(struct.pack("!I", prefix)) print(f"{prefix}/{32 - prefix.bit_length()} {asn} {ip}")

if __name__ == "__main__": db_filename = "DB_091803_v1.txt" input_filename = "IPlist.txt" main(db_filename, input_filename)

This error pops up

Traceback (most recent call last): File "C:\Users\varun\Desktop\P\MS\CN\ip2as5.py", line 42, in main(db_filename, input_filename) File "C:\Users\varun\Desktop\P\MS\CN\ip2as5.py", line 37, in main print(f"{prefix}/{32 - prefix.bit_length()} {asn} {ip}") AttributeError: 'str' object has no attribute 'bit_length