[location/libloc.git] / src / scripts / location-importer.in

#!/usr/bin/python3
###############################################################################
#                                                                             #
# libloc - A library to determine the location of someone on the Internet     #
#                                                                             #
# Copyright (C) 2020-2022 IPFire Development Team <info@ipfire.org>           #
#                                                                             #
# This library is free software; you can redistribute it and/or               #
# modify it under the terms of the GNU Lesser General Public                  #
# License as published by the Free Software Foundation; either                #
# version 2.1 of the License, or (at your option) any later version.          #
#                                                                             #
# This library is distributed in the hope that it will be useful,             #
# but WITHOUT ANY WARRANTY; without even the implied warranty of              #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU           #
# Lesser General Public License for more details.                             #
#                                                                             #
###############################################################################

import argparse
import ipaddress
import json
import logging
import math
import re
import socket
import sys
import telnetlib
import urllib.error

# Load our location module
import location
import location.database
import location.importer
from location.i18n import _

# Initialise logging
log = logging.getLogger("location.importer")
log.propagate = 1

# Define constants
VALID_ASN_RANGES = (
        (1, 23455),
        (23457, 64495),
        (131072, 4199999999),
)


class CLI(object):
        def parse_cli(self):
                parser = argparse.ArgumentParser(
                        description=_("Location Importer Command Line Interface"),
                )
                subparsers = parser.add_subparsers()

                # Global configuration flags
                parser.add_argument("--debug", action="store_true",
                        help=_("Enable debug output"))
                parser.add_argument("--quiet", action="store_true",
                        help=_("Enable quiet mode"))

                # version
                parser.add_argument("--version", action="version",
                        version="%(prog)s @VERSION@")

                # Database
                parser.add_argument("--database-host", required=True,
                        help=_("Database Hostname"), metavar=_("HOST"))
                parser.add_argument("--database-name", required=True,
                        help=_("Database Name"), metavar=_("NAME"))
                parser.add_argument("--database-username", required=True,
                        help=_("Database Username"), metavar=_("USERNAME"))
                parser.add_argument("--database-password", required=True,
                        help=_("Database Password"), metavar=_("PASSWORD"))

                # Write Database
                write = subparsers.add_parser("write", help=_("Write database to file"))
                write.set_defaults(func=self.handle_write)
                write.add_argument("file", nargs=1, help=_("Database File"))
                write.add_argument("--signing-key", nargs="?", type=open, help=_("Signing Key"))
                write.add_argument("--backup-signing-key", nargs="?", type=open, help=_("Backup Signing Key"))
                write.add_argument("--vendor", nargs="?", help=_("Sets the vendor"))
                write.add_argument("--description", nargs="?", help=_("Sets a description"))
                write.add_argument("--license", nargs="?", help=_("Sets the license"))
                write.add_argument("--version", type=int, help=_("Database Format Version"))

                # Update WHOIS
                update_whois = subparsers.add_parser("update-whois", help=_("Update WHOIS Information"))
                update_whois.set_defaults(func=self.handle_update_whois)

                # Update announcements
                update_announcements = subparsers.add_parser("update-announcements",
                        help=_("Update BGP Annoucements"))
                update_announcements.set_defaults(func=self.handle_update_announcements)
                update_announcements.add_argument("server", nargs=1,
                        help=_("Route Server to connect to"), metavar=_("SERVER"))

                # Update overrides
                update_overrides = subparsers.add_parser("update-overrides",
                        help=_("Update overrides"),
                )
                update_overrides.add_argument(
                        "files", nargs="+", help=_("Files to import"),
                )
                update_overrides.set_defaults(func=self.handle_update_overrides)

                # Import countries
                import_countries = subparsers.add_parser("import-countries",
                        help=_("Import countries"),
                )
                import_countries.add_argument("file", nargs=1, type=argparse.FileType("r"),
                        help=_("File to import"))
                import_countries.set_defaults(func=self.handle_import_countries)

                args = parser.parse_args()

                # Configure logging
                if args.debug:
                        location.logger.set_level(logging.DEBUG)
                elif args.quiet:
                        location.logger.set_level(logging.WARNING)

                # Print usage if no action was given
                if not "func" in args:
                        parser.print_usage()
                        sys.exit(2)

                return args

        def run(self):
                # Parse command line arguments
                args = self.parse_cli()

                # Initialise database
                self.db = self._setup_database(args)

                # Call function
                ret = args.func(args)

                # Return with exit code
                if ret:
                        sys.exit(ret)

                # Otherwise just exit
                sys.exit(0)

        def _setup_database(self, ns):
                """
                        Initialise the database
                """
                # Connect to database
                db = location.database.Connection(
                        host=ns.database_host, database=ns.database_name,
                        user=ns.database_username, password=ns.database_password,
                )

                with db.transaction():
                        db.execute("""
                                -- announcements
                                CREATE TABLE IF NOT EXISTS announcements(network inet, autnum bigint,
                                        first_seen_at timestamp without time zone DEFAULT CURRENT_TIMESTAMP,
                                        last_seen_at timestamp without time zone DEFAULT CURRENT_TIMESTAMP);
                                CREATE UNIQUE INDEX IF NOT EXISTS announcements_networks ON announcements(network);
                                CREATE INDEX IF NOT EXISTS announcements_family ON announcements(family(network));
                                CREATE INDEX IF NOT EXISTS announcements_search ON announcements USING GIST(network inet_ops);

                                -- autnums
                                CREATE TABLE IF NOT EXISTS autnums(number bigint, name text NOT NULL);
                                ALTER TABLE autnums ADD COLUMN IF NOT EXISTS source text;
                                CREATE UNIQUE INDEX IF NOT EXISTS autnums_number ON autnums(number);

                                -- countries
                                CREATE TABLE IF NOT EXISTS countries(
                                        country_code text NOT NULL, name text NOT NULL, continent_code text NOT NULL);
                                CREATE UNIQUE INDEX IF NOT EXISTS countries_country_code ON countries(country_code);

                                -- networks
                                CREATE TABLE IF NOT EXISTS networks(network inet, country text);
                                ALTER TABLE networks ADD COLUMN IF NOT EXISTS original_countries text[];
                                ALTER TABLE networks ADD COLUMN IF NOT EXISTS source text;
                                CREATE UNIQUE INDEX IF NOT EXISTS networks_network ON networks(network);
                                CREATE INDEX IF NOT EXISTS networks_family ON networks USING BTREE(family(network));
                                CREATE INDEX IF NOT EXISTS networks_search ON networks USING GIST(network inet_ops);

                                -- overrides
                                CREATE TABLE IF NOT EXISTS autnum_overrides(
                                        number bigint NOT NULL,
                                        name text,
                                        country text,
                                        is_anonymous_proxy boolean,
                                        is_satellite_provider boolean,
                                        is_anycast boolean
                                );
                                CREATE UNIQUE INDEX IF NOT EXISTS autnum_overrides_number
                                        ON autnum_overrides(number);
                                ALTER TABLE autnum_overrides ADD COLUMN IF NOT EXISTS source text;
                                ALTER TABLE autnum_overrides ADD COLUMN IF NOT EXISTS is_drop boolean;

                                CREATE TABLE IF NOT EXISTS network_overrides(
                                        network inet NOT NULL,
                                        country text,
                                        is_anonymous_proxy boolean,
                                        is_satellite_provider boolean,
                                        is_anycast boolean
                                );
                                CREATE UNIQUE INDEX IF NOT EXISTS network_overrides_network
                                        ON network_overrides(network);
                                CREATE INDEX IF NOT EXISTS network_overrides_search
                                        ON network_overrides USING GIST(network inet_ops);
                                ALTER TABLE network_overrides ADD COLUMN IF NOT EXISTS source text;
                                ALTER TABLE network_overrides ADD COLUMN IF NOT EXISTS is_drop boolean;
                        """)

                return db

        def handle_write(self, ns):
                """
                        Compiles a database in libloc format out of what is in the database
                """
                # Allocate a writer
                writer = location.Writer(ns.signing_key, ns.backup_signing_key)

                # Set all metadata
                if ns.vendor:
                        writer.vendor = ns.vendor

                if ns.description:
                        writer.description = ns.description

                if ns.license:
                        writer.license = ns.license

                # Add all Autonomous Systems
                log.info("Writing Autonomous Systems...")

                # Select all ASes with a name
                rows = self.db.query("""
                        SELECT
                                autnums.number AS number,
                                COALESCE(
                                        (SELECT overrides.name FROM autnum_overrides overrides
                                                WHERE overrides.number = autnums.number),
                                        autnums.name
                                ) AS name
                                FROM autnums
                                WHERE name <> %s ORDER BY number
                        """, "")

                for row in rows:
                        a = writer.add_as(row.number)
                        a.name = row.name

                # Add all networks
                log.info("Writing networks...")

                # Select all known networks
                rows = self.db.query("""
                        WITH known_networks AS (
                                SELECT network FROM announcements
                                UNION
                                SELECT network FROM networks
                                UNION
                                SELECT network FROM network_overrides
                        ),

                        ordered_networks AS (
                                SELECT
                                        known_networks.network AS network,
                                        announcements.autnum AS autnum,
                                        networks.country AS country,

                                        -- Must be part of returned values for ORDER BY clause
                                        masklen(announcements.network) AS sort_a,
                                        masklen(networks.network) AS sort_b
                                FROM
                                        known_networks
                                LEFT JOIN
                                        announcements ON known_networks.network <<= announcements.network
                                LEFT JOIN
                                        networks ON known_networks.network <<= networks.network
                                ORDER BY
                                        known_networks.network,
                                        sort_a DESC,
                                        sort_b DESC
                        )

                        -- Return a list of those networks enriched with all
                        -- other information that we store in the database
                        SELECT
                                DISTINCT ON (network)
                                network,
                                autnum,

                                -- Country
                                COALESCE(
                                        (
                                                SELECT country FROM network_overrides overrides
                                                        WHERE networks.network <<= overrides.network
                                                        ORDER BY masklen(overrides.network) DESC
                                                        LIMIT 1
                                        ),
                                        (
                                                SELECT country FROM autnum_overrides overrides
                                                        WHERE networks.autnum = overrides.number
                                        ),
                                        networks.country
                                ) AS country,

                                -- Flags
                                COALESCE(
                                        (
                                                SELECT is_anonymous_proxy FROM network_overrides overrides
                                                        WHERE networks.network <<= overrides.network
                                                        ORDER BY masklen(overrides.network) DESC
                                                        LIMIT 1
                                        ),
                                        (
                                                SELECT is_anonymous_proxy FROM autnum_overrides overrides
                                                        WHERE networks.autnum = overrides.number
                                        ),
                                        FALSE
                                ) AS is_anonymous_proxy,
                                COALESCE(
                                        (
                                                SELECT is_satellite_provider FROM network_overrides overrides
                                                        WHERE networks.network <<= overrides.network
                                                        ORDER BY masklen(overrides.network) DESC
                                                        LIMIT 1
                                        ),
                                        (
                                                SELECT is_satellite_provider FROM autnum_overrides overrides
                                                        WHERE networks.autnum = overrides.number
                                        ),
                                        FALSE
                                ) AS is_satellite_provider,
                                COALESCE(
                                        (
                                                SELECT is_anycast FROM network_overrides overrides
                                                        WHERE networks.network <<= overrides.network
                                                        ORDER BY masklen(overrides.network) DESC
                                                        LIMIT 1
                                        ),
                                        (
                                                SELECT is_anycast FROM autnum_overrides overrides
                                                        WHERE networks.autnum = overrides.number
                                        ),
                                        FALSE
                                ) AS is_anycast,
                                COALESCE(
                                        (
                                                SELECT is_drop FROM network_overrides overrides
                                                        WHERE networks.network <<= overrides.network
                                                        ORDER BY masklen(overrides.network) DESC
                                                        LIMIT 1
                                        ),
                                        (
                                                SELECT is_drop FROM autnum_overrides overrides
                                                        WHERE networks.autnum = overrides.number
                                        ),
                                        FALSE
                                ) AS is_drop
                        FROM
                                ordered_networks networks
                """)

                for row in rows:
                        network = writer.add_network(row.network)

                        # Save country
                        if row.country:
                                network.country_code = row.country

                        # Save ASN
                        if row.autnum:
                                network.asn = row.autnum

                        # Set flags
                        if row.is_anonymous_proxy:
                                network.set_flag(location.NETWORK_FLAG_ANONYMOUS_PROXY)

                        if row.is_satellite_provider:
                                network.set_flag(location.NETWORK_FLAG_SATELLITE_PROVIDER)

                        if row.is_anycast:
                                network.set_flag(location.NETWORK_FLAG_ANYCAST)

                        if row.is_drop:
                                network.set_flag(location.NETWORK_FLAG_DROP)

                # Add all countries
                log.info("Writing countries...")
                rows = self.db.query("SELECT * FROM countries ORDER BY country_code")

                for row in rows:
                        c = writer.add_country(row.country_code)
                        c.continent_code = row.continent_code
                        c.name = row.name

                # Write everything to file
                log.info("Writing database to file...")
                for file in ns.file:
                        writer.write(file)

        def handle_update_whois(self, ns):
                downloader = location.importer.Downloader()

                # Did we run successfully?
                error = False

                # Fetch all valid country codes to check parsed networks aganist
                validcountries = self.countries

                # Iterate over all potential sources
                for source in sorted(location.importer.SOURCES):
                        with self.db.transaction():
                                # Create some temporary tables to store parsed data
                                self.db.execute("""
                                        CREATE TEMPORARY TABLE _autnums(number integer NOT NULL,
                                                organization text NOT NULL, source text NOT NULL) ON COMMIT DROP;
                                        CREATE UNIQUE INDEX _autnums_number ON _autnums(number);

                                        CREATE TEMPORARY TABLE _organizations(handle text NOT NULL,
                                                name text NOT NULL, source text NOT NULL) ON COMMIT DROP;
                                        CREATE UNIQUE INDEX _organizations_handle ON _organizations(handle);

                                        CREATE TEMPORARY TABLE _rirdata(network inet NOT NULL, country text NOT NULL,
                                                original_countries text[] NOT NULL, source text NOT NULL)
                                                ON COMMIT DROP;
                                        CREATE INDEX _rirdata_search ON _rirdata
                                                USING BTREE(family(network), masklen(network));
                                        CREATE UNIQUE INDEX _rirdata_network ON _rirdata(network);
                                """)

                                # Remove all previously imported content
                                self.db.execute("DELETE FROM networks WHERE source = %s", source)

                                try:
                                        # Fetch WHOIS sources
                                        for url in location.importer.WHOIS_SOURCES.get(source, []):
                                                for block in downloader.request_blocks(url):
                                                        self._parse_block(block, source, validcountries)

                                        # Fetch extended sources
                                        for url in location.importer.EXTENDED_SOURCES.get(source, []):
                                                for line in downloader.request_lines(url):
                                                        self._parse_line(line, source, validcountries)
                                except urllib.error.URLError as e:
                                        log.error("Could not retrieve data from %s: %s" % (source, e))
                                        error = True

                                        # Continue with the next source
                                        continue

                                # Process all parsed networks from every RIR we happen to have access to,
                                # insert the largest network chunks into the networks table immediately...
                                families = self.db.query("SELECT DISTINCT family(network) AS family FROM _rirdata \
                                        ORDER BY family(network)")

                                for family in (row.family for row in families):
                                        # Fetch the smallest mask length in our data set
                                        smallest = self.db.get("""
                                                SELECT
                                                        MIN(
                                                                masklen(network)
                                                        ) AS prefix
                                                FROM
                                                        _rirdata
                                                WHERE
                                                        family(network) = %s""",
                                                family,
                                        )

                                        # Copy all networks
                                        self.db.execute("""
                                                INSERT INTO
                                                        networks
                                                (
                                                        network,
                                                        country,
                                                        original_countries,
                                                        source
                                                )
                                                SELECT
                                                        network,
                                                        country,
                                                        original_countries,
                                                        source
                                                FROM
                                                        _rirdata
                                                WHERE
                                                        masklen(network) = %s
                                                AND
                                                        family(network) = %s
                                                ON CONFLICT DO
                                                        NOTHING""",
                                                smallest.prefix,
                                                family,
                                        )

                                        # ... determine any other prefixes for this network family, ...
                                        prefixes = self.db.query("""
                                                SELECT
                                                        DISTINCT masklen(network) AS prefix
                                                FROM
                                                        _rirdata
                                                WHERE
                                                        family(network) = %s
                                                ORDER BY
                                                        masklen(network) ASC
                                                OFFSET 1""",
                                                family,
                                        )

                                        # ... and insert networks with this prefix in case they provide additional
                                        # information (i. e. subnet of a larger chunk with a different country)
                                        for prefix in (row.prefix for row in prefixes):
                                                self.db.execute("""
                                                        WITH candidates AS (
                                                                SELECT
                                                                        _rirdata.network,
                                                                        _rirdata.country,
                                                                        _rirdata.original_countries,
                                                                        _rirdata.source
                                                                FROM
                                                                        _rirdata
                                                                WHERE
                                                                        family(_rirdata.network) = %s
                                                                AND
                                                                        masklen(_rirdata.network) = %s
                                                        ),
                                                        filtered AS (
                                                                SELECT
                                                                        DISTINCT ON (c.network)
                                                                        c.network,
                                                                        c.country,
                                                                        c.original_countries,
                                                                        c.source,
                                                                        masklen(networks.network),
                                                                        networks.country AS parent_country
                                                                FROM
                                                                        candidates c
                                                                LEFT JOIN
                                                                        networks
                                                                ON
                                                                        c.network << networks.network
                                                                ORDER BY
                                                                        c.network,
                                                                        masklen(networks.network) DESC NULLS LAST
                                                        )
                                                        INSERT INTO
                                                                networks(network, country, original_countries, source)
                                                        SELECT
                                                                network,
                                                                country,
                                                                original_countries,
                                                                source
                                                        FROM
                                                                filtered
                                                        WHERE
                                                                parent_country IS NULL
                                                        OR
                                                                country <> parent_country
                                                        ON CONFLICT DO NOTHING""",
                                                        family, prefix,
                                                )

                                self.db.execute("""
                                        INSERT INTO autnums(number, name, source)
                                                SELECT _autnums.number, _organizations.name, _organizations.source FROM _autnums
                                                        JOIN _organizations ON _autnums.organization = _organizations.handle
                                        ON CONFLICT (number) DO UPDATE SET name = excluded.name;
                                """)

                # Download and import (technical) AS names from ARIN
                with self.db.transaction():
                        self._import_as_names_from_arin()

                # Return a non-zero exit code for errors
                return 1 if error else 0

        def _check_parsed_network(self, network):
                """
                        Assistive function to detect and subsequently sort out parsed
                        networks from RIR data (both Whois and so-called "extended sources"),
                        which are or have...

                        (a) not globally routable (RFC 1918 space, et al.)
                        (b) covering a too large chunk of the IP address space (prefix length
                                is < 7 for IPv4 networks, and < 10 for IPv6)
                        (c) "0.0.0.0" or "::" as a network address
                        (d) are too small for being publicly announced (we have decided not to
                                process them at the moment, as they significantly enlarge our
                                database without providing very helpful additional information)

                        This unfortunately is necessary due to brain-dead clutter across
                        various RIR databases, causing mismatches and eventually disruptions.

                        We will return False in case a network is not suitable for adding
                        it to our database, and True otherwise.
                """

                if not network or not (isinstance(network, ipaddress.IPv4Network) or isinstance(network, ipaddress.IPv6Network)):
                        return False

                if not network.is_global:
                        log.debug("Skipping non-globally routable network: %s" % network)
                        return False

                if network.version == 4:
                        if network.prefixlen < 7:
                                log.debug("Skipping too big IP chunk: %s" % network)
                                return False

                        if network.prefixlen > 24:
                                log.debug("Skipping network too small to be publicly announced: %s" % network)
                                return False

                        if str(network.network_address) == "0.0.0.0":
                                log.debug("Skipping network based on 0.0.0.0: %s" % network)
                                return False

                elif network.version == 6:
                        if network.prefixlen < 10:
                                log.debug("Skipping too big IP chunk: %s" % network)
                                return False

                        if network.prefixlen > 48:
                                log.debug("Skipping network too small to be publicly announced: %s" % network)
                                return False

                        if str(network.network_address) == "::":
                                log.debug("Skipping network based on '::': %s" % network)
                                return False

                else:
                        # This should not happen...
                        log.warning("Skipping network of unknown family, this should not happen: %s" % network)
                        return False

                # In case we have made it here, the network is considered to
                # be suitable for libloc consumption...
                return True

        def _check_parsed_asn(self, asn):
                """
                        Assistive function to filter Autonomous System Numbers not being suitable
                        for adding to our database. Returns False in such cases, and True otherwise.
                """

                for start, end in VALID_ASN_RANGES:
                        if start <= asn and end >= asn:
                                return True

                log.info("Supplied ASN %s out of publicly routable ASN ranges" % asn)
                return False

        def _parse_block(self, block, source_key, validcountries = None):
                # Get first line to find out what type of block this is
                line = block[0]

                # aut-num
                if line.startswith("aut-num:"):
                        return self._parse_autnum_block(block, source_key)

                # inetnum
                if line.startswith("inet6num:") or line.startswith("inetnum:"):
                        return self._parse_inetnum_block(block, source_key, validcountries)

                # organisation
                elif line.startswith("organisation:"):
                        return self._parse_org_block(block, source_key)

        def _parse_autnum_block(self, block, source_key):
                autnum = {}
                for line in block:
                        # Split line
                        key, val = split_line(line)

                        if key == "aut-num":
                                m = re.match(r"^(AS|as)(\d+)", val)
                                if m:
                                        autnum["asn"] = m.group(2)

                        elif key == "org":
                                autnum[key] = val.upper()

                        elif key == "descr":
                                # Save the first description line as well...
                                if not key in autnum:
                                        autnum[key] = val

                # Skip empty objects
                if not autnum or not "asn" in autnum:
                        return

                # Insert a dummy organisation handle into our temporary organisations
                # table in case the AS does not have an organisation handle set, but
                # has a description (a quirk often observed in APNIC area), so we can
                # later display at least some string for this AS.
                if not "org" in autnum:
                        if "descr" in autnum:
                                autnum["org"] = "LIBLOC-%s-ORGHANDLE" % autnum.get("asn")

                                self.db.execute("INSERT INTO _organizations(handle, name, source) \
                                        VALUES(%s, %s, %s) ON CONFLICT (handle) DO NOTHING",
                                        autnum.get("org"), autnum.get("descr"), source_key,
                                )
                        else:
                                log.warning("ASN %s neither has an organisation handle nor a description line set, omitting" % \
                                                autnum.get("asn"))
                                return

                # Insert into database
                self.db.execute("INSERT INTO _autnums(number, organization, source) \
                        VALUES(%s, %s, %s) ON CONFLICT (number) DO UPDATE SET \
                                organization = excluded.organization",
                        autnum.get("asn"), autnum.get("org"), source_key,
                )

        def _parse_inetnum_block(self, block, source_key, validcountries = None):
                log.debug("Parsing inetnum block:")

                inetnum = {}
                for line in block:
                        log.debug(line)

                        # Split line
                        key, val = split_line(line)

                        # Filter any inetnum records which are only referring to IP space
                        # not managed by that specific RIR...
                        if key == "netname":
                                if re.match(r"^(ERX-NETBLOCK|(AFRINIC|ARIN|LACNIC|RIPE)-CIDR-BLOCK|IANA-NETBLOCK-\d{1,3}|NON-RIPE-NCC-MANAGED-ADDRESS-BLOCK|STUB-[\d-]{3,}SLASH\d{1,2})", val.strip()):
                                        log.debug("Skipping record indicating historic/orphaned data: %s" % val.strip())
                                        return

                        if key == "inetnum":
                                start_address, delim, end_address = val.partition("-")

                                # Strip any excess space
                                start_address, end_address = start_address.rstrip(), end_address.strip()

                                # Handle "inetnum" formatting in LACNIC DB (e.g. "24.152.8/22" instead of "24.152.8.0/22")
                                if start_address and not (delim or end_address):
                                        try:
                                                start_address = ipaddress.ip_network(start_address, strict=False)
                                        except ValueError:
                                                start_address = start_address.split("/")
                                                ldigits = start_address[0].count(".")

                                                # How many octets do we need to add?
                                                # (LACNIC does not seem to have a /8 or greater assigned, so the following should suffice.)
                                                if ldigits == 1:
                                                        start_address = start_address[0] + ".0.0/" + start_address[1]
                                                elif ldigits == 2:
                                                        start_address = start_address[0] + ".0/" + start_address[1]
                                                else:
                                                        log.warning("Could not recover IPv4 address from line in LACNIC DB format: %s" % line)
                                                        return

                                                try:
                                                        start_address = ipaddress.ip_network(start_address, strict=False)
                                                except ValueError:
                                                        log.warning("Could not parse line in LACNIC DB format: %s" % line)
                                                        return

                                        # Enumerate first and last IP address of this network
                                        end_address = start_address[-1]
                                        start_address = start_address[0]

                                else:
                                        # Convert to IP address
                                        try:
                                                start_address = ipaddress.ip_address(start_address)
                                                end_address   = ipaddress.ip_address(end_address)
                                        except ValueError:
                                                log.warning("Could not parse line: %s" % line)
                                                return

                                inetnum["inetnum"] = list(ipaddress.summarize_address_range(start_address, end_address))

                        elif key == "inet6num":
                                inetnum[key] = [ipaddress.ip_network(val, strict=False)]

                        elif key == "country":
                                val = val.upper()

                                # Catch RIR data objects with more than one country code...
                                if not key in inetnum:
                                        inetnum[key] = []
                                else:
                                        if val in inetnum.get("country"):
                                                # ... but keep this list distinct...
                                                continue

                                # When people set country codes to "UK", they actually mean "GB"
                                if val == "UK":
                                        val = "GB"

                                inetnum[key].append(val)

                # Skip empty objects
                if not inetnum or not "country" in inetnum:
                        return

                # Prepare skipping objects with unknown country codes...
                invalidcountries = [singlecountry for singlecountry in inetnum.get("country") if singlecountry not in validcountries]

                # Iterate through all networks enumerated from above, check them for plausibility and insert
                # them into the database, if _check_parsed_network() succeeded
                for single_network in inetnum.get("inet6num") or inetnum.get("inetnum"):
                        if self._check_parsed_network(single_network):

                                # Skip objects with unknown country codes if they are valid to avoid log spam...
                                if validcountries and invalidcountries:
                                        log.warning("Skipping network with bogus countr(y|ies) %s (original countries: %s): %s" % \
                                                (invalidcountries, inetnum.get("country"), inetnum.get("inet6num") or inetnum.get("inetnum")))
                                        break

                                # Everything is fine here, run INSERT statement...
                                self.db.execute("INSERT INTO _rirdata(network, country, original_countries, source) \
                                        VALUES(%s, %s, %s, %s) ON CONFLICT (network) DO UPDATE SET country = excluded.country",
                                        "%s" % single_network, inetnum.get("country")[0], inetnum.get("country"), source_key,
                                )

        def _parse_org_block(self, block, source_key):
                org = {}
                for line in block:
                        # Split line
                        key, val = split_line(line)

                        if key == "organisation":
                                org[key] = val.upper()
                        elif key == "org-name":
                                org[key] = val

                # Skip empty objects
                if not org:
                        return

                self.db.execute("INSERT INTO _organizations(handle, name, source) \
                        VALUES(%s, %s, %s) ON CONFLICT (handle) DO \
                        UPDATE SET name = excluded.name",
                        org.get("organisation"), org.get("org-name"), source_key,
                )

        def _parse_line(self, line, source_key, validcountries = None):
                # Skip version line
                if line.startswith("2"):
                        return

                # Skip comments
                if line.startswith("#"):
                        return

                try:
                        registry, country_code, type, line = line.split("|", 3)
                except:
                        log.warning("Could not parse line: %s" % line)
                        return

                # Skip any lines that are for stats only or do not have a country
                # code at all (avoids log spam below)
                if not country_code or country_code == '*':
                        return

                # Skip objects with unknown country codes
                if validcountries and country_code not in validcountries:
                        log.warning("Skipping line with bogus country '%s': %s" % \
                                (country_code, line))
                        return

                if type in ("ipv6", "ipv4"):
                        return self._parse_ip_line(country_code, type, line, source_key)

        def _parse_ip_line(self, country, type, line, source_key):
                try:
                        address, prefix, date, status, organization = line.split("|")
                except ValueError:
                        organization = None

                        # Try parsing the line without organization
                        try:
                                address, prefix, date, status = line.split("|")
                        except ValueError:
                                log.warning("Unhandled line format: %s" % line)
                                return

                # Skip anything that isn't properly assigned
                if not status in ("assigned", "allocated"):
                        return

                # Cast prefix into an integer
                try:
                        prefix = int(prefix)
                except:
                        log.warning("Invalid prefix: %s" % prefix)
                        return

                # Fix prefix length for IPv4
                if type == "ipv4":
                        prefix = 32 - int(math.log(prefix, 2))

                # Try to parse the address
                try:
                        network = ipaddress.ip_network("%s/%s" % (address, prefix), strict=False)
                except ValueError:
                        log.warning("Invalid IP address: %s" % address)
                        return

                if not self._check_parsed_network(network):
                        return

                self.db.execute("INSERT INTO networks(network, country, original_countries, source) \
                        VALUES(%s, %s, %s, %s) ON CONFLICT (network) DO \
                        UPDATE SET country = excluded.country",
                        "%s" % network, country, [country], source_key,
                )

        def _import_as_names_from_arin(self):
                downloader = location.importer.Downloader()

                # XXX: Download AS names file from ARIN (note that these names appear to be quite
                # technical, not intended for human consumption, as description fields in
                # organisation handles for other RIRs are - however, this is what we have got,
                # and in some cases, it might be still better than nothing)
                for line in downloader.request_lines("https://ftp.arin.net/info/asn.txt"):
                        # Valid lines start with a space, followed by the number of the Autonomous System ...
                        if not line.startswith(" "):
                                continue

                        # Split line and check if there is a valid ASN in it...
                        asn, name = line.split()[0:2]

                        try:
                                asn = int(asn)
                        except ValueError:
                                log.debug("Skipping ARIN AS names line not containing an integer for ASN")
                                continue

                        # Filter invalid ASNs...
                        if not self._check_parsed_asn(asn):
                                continue

                        # Skip any AS name that appears to be a placeholder for a different RIR or entity...
                        if re.match(r"^(ASN-BLK|)(AFCONC|AFRINIC|APNIC|ASNBLK|LACNIC|RIPE|IANA)(?:\d?$|\-)", name):
                                continue

                        # Bail out in case the AS name contains anything we do not expect here...
                        if re.search(r"[^a-zA-Z0-9-_]", name):
                                log.debug("Skipping ARIN AS name for %s containing invalid characters: %s" % \
                                                (asn, name))

                        # Things look good here, run INSERT statement and skip this one if we already have
                        # a (better?) name for this Autonomous System...
                        self.db.execute("""
                                INSERT INTO autnums(
                                        number,
                                        name,
                                        source
                                ) VALUES (%s, %s, %s)
                                ON CONFLICT (number) DO NOTHING""",
                                asn,
                                name,
                                "ARIN",
                        )

        def handle_update_announcements(self, ns):
                server = ns.server[0]

                with self.db.transaction():
                        if server.startswith("/"):
                                self._handle_update_announcements_from_bird(server)
                        else:
                                self._handle_update_announcements_from_telnet(server)

                        # Purge anything we never want here
                        self.db.execute("""
                                -- Delete default routes
                                DELETE FROM announcements WHERE network = '::/0' OR network = '0.0.0.0/0';

                                -- Delete anything that is not global unicast address space
                                DELETE FROM announcements WHERE family(network) = 6 AND NOT network <<= '2000::/3';

                                -- DELETE "current network" address space
                                DELETE FROM announcements WHERE family(network) = 4 AND network <<= '0.0.0.0/8';

                                -- DELETE local loopback address space
                                DELETE FROM announcements WHERE family(network) = 4 AND network <<= '127.0.0.0/8';

                                -- DELETE RFC 1918 address space
                                DELETE FROM announcements WHERE family(network) = 4 AND network <<= '10.0.0.0/8';
                                DELETE FROM announcements WHERE family(network) = 4 AND network <<= '172.16.0.0/12';
                                DELETE FROM announcements WHERE family(network) = 4 AND network <<= '192.168.0.0/16';

                                -- DELETE test, benchmark and documentation address space
                                DELETE FROM announcements WHERE family(network) = 4 AND network <<= '192.0.0.0/24';
                                DELETE FROM announcements WHERE family(network) = 4 AND network <<= '192.0.2.0/24';
                                DELETE FROM announcements WHERE family(network) = 4 AND network <<= '198.18.0.0/15';
                                DELETE FROM announcements WHERE family(network) = 4 AND network <<= '198.51.100.0/24';
                                DELETE FROM announcements WHERE family(network) = 4 AND network <<= '203.0.113.0/24';

                                -- DELETE CGNAT address space (RFC 6598)
                                DELETE FROM announcements WHERE family(network) = 4 AND network <<= '100.64.0.0/10';

                                -- DELETE link local address space
                                DELETE FROM announcements WHERE family(network) = 4 AND network <<= '169.254.0.0/16';

                                -- DELETE IPv6 to IPv4 (6to4) address space (RFC 3068)
                                DELETE FROM announcements WHERE family(network) = 4 AND network <<= '192.88.99.0/24';
                                DELETE FROM announcements WHERE family(network) = 6 AND network <<= '2002::/16';

                                -- DELETE multicast and reserved address space
                                DELETE FROM announcements WHERE family(network) = 4 AND network <<= '224.0.0.0/4';
                                DELETE FROM announcements WHERE family(network) = 4 AND network <<= '240.0.0.0/4';

                                -- Delete networks that are too small to be in the global routing table
                                DELETE FROM announcements WHERE family(network) = 6 AND masklen(network) > 48;
                                DELETE FROM announcements WHERE family(network) = 4 AND masklen(network) > 24;

                                -- Delete any non-public or reserved ASNs
                                DELETE FROM announcements WHERE NOT (
                                        (autnum >= 1 AND autnum <= 23455)
                                        OR
                                        (autnum >= 23457 AND autnum <= 64495)
                                        OR
                                        (autnum >= 131072 AND autnum <= 4199999999)
                                );

                                -- Delete everything that we have not seen for 14 days
                                DELETE FROM announcements WHERE last_seen_at <= CURRENT_TIMESTAMP - INTERVAL '14 days';
                        """)

        def _handle_update_announcements_from_bird(self, server):
                # Pre-compile the regular expression for faster searching
                route = re.compile(b"^\s(.+?)\s+.+?\[(?:AS(.*?))?.\]$")

                log.info("Requesting routing table from Bird (%s)" % server)

                aggregated_networks = []

                # Send command to list all routes
                for line in self._bird_cmd(server, "show route"):
                        m = route.match(line)
                        if not m:
                                # Skip empty lines
                                if not line:
                                        pass

                                # Ignore any header lines with the name of the routing table
                                elif line.startswith(b"Table"):
                                        pass

                                # Log anything else
                                else:
                                        log.debug("Could not parse line: %s" % line.decode())

                                continue

                        # Fetch the extracted network and ASN
                        network, autnum = m.groups()

                        # Decode into strings
                        if network:
                                network = network.decode()
                        if autnum:
                                autnum = autnum.decode()

                        # Collect all aggregated networks
                        if not autnum:
                                log.debug("%s is an aggregated network" % network)
                                aggregated_networks.append(network)
                                continue

                        # Insert it into the database
                        self.db.execute("INSERT INTO announcements(network, autnum) \
                                VALUES(%s, %s) ON CONFLICT (network) DO \
                                UPDATE SET autnum = excluded.autnum, last_seen_at = CURRENT_TIMESTAMP",
                                network, autnum,
                        )

                # Process any aggregated networks
                for network in aggregated_networks:
                        log.debug("Processing aggregated network %s" % network)

                        # Run "show route all" for each network
                        for line in self._bird_cmd(server, "show route %s all" % network):
                                # Try finding the path
                                m = re.match(b"\s+BGP\.as_path:.* (\d+) {\d+}$", line)
                                if m:
                                        # Select the last AS number in the path
                                        autnum = m.group(1).decode()

                                        # Insert it into the database
                                        self.db.execute("INSERT INTO announcements(network, autnum) \
                                                VALUES(%s, %s) ON CONFLICT (network) DO \
                                                UPDATE SET autnum = excluded.autnum, last_seen_at = CURRENT_TIMESTAMP",
                                                network, autnum,
                                        )

                                        # We don't need to process any more
                                        break

        def _handle_update_announcements_from_telnet(self, server):
                # Pre-compile regular expression for routes
                route = re.compile(b"^\*[\s\>]i([^\s]+).+?(\d+)\si\r\n", re.MULTILINE|re.DOTALL)

                with telnetlib.Telnet(server) as t:
                        # Enable debug mode
                        #if ns.debug:
                        #       t.set_debuglevel(10)

                        # Wait for console greeting
                        greeting = t.read_until(b"> ", timeout=30)
                        if not greeting:
                                log.error("Could not get a console prompt")
                                return 1

                        # Disable pagination
                        t.write(b"terminal length 0\n")

                        # Wait for the prompt to return
                        t.read_until(b"> ")

                        # Fetch the routing tables
                        for protocol in ("ipv6", "ipv4"):
                                log.info("Requesting %s routing table" % protocol)

                                # Request the full unicast routing table
                                t.write(b"show bgp %s unicast\n" % protocol.encode())

                                # Read entire header which ends with "Path"
                                t.read_until(b"Path\r\n")

                                while True:
                                        # Try reading a full entry
                                        # Those might be broken across multiple lines but ends with i
                                        line = t.read_until(b"i\r\n", timeout=5)
                                        if not line:
                                                break

                                        # Show line for debugging
                                        #log.debug(repr(line))

                                        # Try finding a route in here
                                        m = route.match(line)
                                        if m:
                                                network, autnum = m.groups()

                                                # Convert network to string
                                                network = network.decode()

                                                # Append /24 for IPv4 addresses
                                                if not "/" in network and not ":" in network:
                                                        network = "%s/24" % network

                                                # Convert AS number to integer
                                                autnum = int(autnum)

                                                log.info("Found announcement for %s by %s" % (network, autnum))

                                                self.db.execute("INSERT INTO announcements(network, autnum) \
                                                        VALUES(%s, %s) ON CONFLICT (network) DO \
                                                        UPDATE SET autnum = excluded.autnum, last_seen_at = CURRENT_TIMESTAMP",
                                                        network, autnum,
                                                )

                                log.info("Finished reading the %s routing table" % protocol)

        def _bird_cmd(self, socket_path, command):
                # Connect to the socket
                s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
                s.connect(socket_path)

                # Allocate some buffer
                buffer = b""

                log.debug("Sending Bird command: %s" % command)

                # Send the command
                s.send(b"%s\n" % command.encode())

                while True:
                        # Fill up the buffer
                        buffer += s.recv(4096)

                        while True:
                                # Search for the next newline
                                pos = buffer.find(b"\n")

                                # If we cannot find one, we go back and read more data
                                if pos <= 0:
                                        break

                                # Cut after the newline character
                                pos += 1

                                # Split the line we want and keep the rest in buffer
                                line, buffer = buffer[:pos], buffer[pos:]

                                # Try parsing any status lines
                                if len(line) > 4 and line[:4].isdigit() and line[4] in (32, 45):
                                        code, delim, line = int(line[:4]), line[4], line[5:]

                                        log.debug("Received response code %s from bird" % code)

                                        # End of output
                                        if code == 0:
                                                return

                                        # Ignore hello line
                                        elif code == 1:
                                                continue

                                # Otherwise return the line
                                yield line

        def handle_update_overrides(self, ns):
                with self.db.transaction():
                        # Only drop manually created overrides, as we can be reasonably sure to have them,
                        # and preserve the rest. If appropriate, it is deleted by correspondent functions.
                        self.db.execute("""
                                DELETE FROM autnum_overrides WHERE source = 'manual';
                                DELETE FROM network_overrides WHERE source = 'manual';
                        """)

                        # Update overrides for various cloud providers big enough to publish their own IP
                        # network allocation lists in a machine-readable format...
                        self._update_overrides_for_aws()

                        # Update overrides for Spamhaus DROP feeds...
                        self._update_overrides_for_spamhaus_drop()

                        for file in ns.files:
                                log.info("Reading %s..." % file)

                                with open(file, "rb") as f:
                                        for type, block in location.importer.read_blocks(f):
                                                if type == "net":
                                                        network = block.get("net")
                                                        # Try to parse and normalise the network
                                                        try:
                                                                network = ipaddress.ip_network(network, strict=False)
                                                        except ValueError as e:
                                                                log.warning("Invalid IP network: %s: %s" % (network, e))
                                                                continue

                                                        # Prevent that we overwrite all networks
                                                        if network.prefixlen == 0:
                                                                log.warning("Skipping %s: You cannot overwrite default" % network)
                                                                continue

                                                        self.db.execute("""
                                                                INSERT INTO network_overrides(
                                                                        network,
                                                                        country,
                                                                        source,
                                                                        is_anonymous_proxy,
                                                                        is_satellite_provider,
                                                                        is_anycast,
                                                                        is_drop
                                                                ) VALUES (%s, %s, %s, %s, %s, %s, %s)
                                                                ON CONFLICT (network) DO NOTHING""",
                                                                "%s" % network,
                                                                block.get("country"),
                                                                "manual",
                                                                self._parse_bool(block, "is-anonymous-proxy"),
                                                                self._parse_bool(block, "is-satellite-provider"),
                                                                self._parse_bool(block, "is-anycast"),
                                                                self._parse_bool(block, "drop"),
                                                        )

                                                elif type == "aut-num":
                                                        autnum = block.get("aut-num")

                                                        # Check if AS number begins with "AS"
                                                        if not autnum.startswith("AS"):
                                                                log.warning("Invalid AS number: %s" % autnum)
                                                                continue

                                                        # Strip "AS"
                                                        autnum = autnum[2:]

                                                        self.db.execute("""
                                                                INSERT INTO autnum_overrides(
                                                                        number,
                                                                        name,
                                                                        country,
                                                                        source,
                                                                        is_anonymous_proxy,
                                                                        is_satellite_provider,
                                                                        is_anycast,
                                                                        is_drop
                                                                ) VALUES(%s, %s, %s, %s, %s, %s, %s, %s)
                                                                ON CONFLICT DO NOTHING""",
                                                                autnum,
                                                                block.get("name"),
                                                                block.get("country"),
                                                                "manual",
                                                                self._parse_bool(block, "is-anonymous-proxy"),
                                                                self._parse_bool(block, "is-satellite-provider"),
                                                                self._parse_bool(block, "is-anycast"),
                                                                self._parse_bool(block, "drop"),
                                                        )

                                                else:
                                                        log.warning("Unsupported type: %s" % type)

        def _update_overrides_for_aws(self):
                # Download Amazon AWS IP allocation file to create overrides...
                downloader = location.importer.Downloader()

                try:
                        # Fetch IP ranges
                        f = downloader.retrieve("https://ip-ranges.amazonaws.com/ip-ranges.json")

                        # Parse downloaded file
                        aws_ip_dump = json.load(f)
                except Exception as e:
                        log.error("unable to preprocess Amazon AWS IP ranges: %s" % e)
                        return

                # At this point, we can assume the downloaded file to be valid
                self.db.execute("""
                        DELETE FROM network_overrides WHERE source = 'Amazon AWS IP feed';
                """)

                # XXX: Set up a dictionary for mapping a region name to a country. Unfortunately,
                # there seems to be no machine-readable version available of this other than
                # https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html
                # (worse, it seems to be incomplete :-/ ); https://www.cloudping.cloud/endpoints
                # was helpful here as well.
                aws_region_country_map = {
                                "af-south-1": "ZA",
                                "ap-east-1": "HK",
                                "ap-south-1": "IN",
                                "ap-south-2": "IN",
                                "ap-northeast-3": "JP",
                                "ap-northeast-2": "KR",
                                "ap-southeast-1": "SG",
                                "ap-southeast-2": "AU",
                                "ap-southeast-3": "MY",
                                "ap-southeast-4": "AU",
                                "ap-northeast-1": "JP",
                                "ca-central-1": "CA",
                                "eu-central-1": "DE",
                                "eu-central-2": "CH",
                                "eu-west-1": "IE",
                                "eu-west-2": "GB",
                                "eu-south-1": "IT",
                                "eu-south-2": "ES",
                                "eu-west-3": "FR",
                                "eu-north-1": "SE",
                                "il-central-1": "IL", # XXX: This one is not documented anywhere except for ip-ranges.json itself
                                "me-central-1": "AE",
                                "me-south-1": "BH",
                                "sa-east-1": "BR"
                                }

                # Fetch all valid country codes to check parsed networks aganist...
                rows = self.db.query("SELECT * FROM countries ORDER BY country_code")
                validcountries = []

                for row in rows:
                        validcountries.append(row.country_code)

                with self.db.transaction():
                        for snetwork in aws_ip_dump["prefixes"] + aws_ip_dump["ipv6_prefixes"]:
                                try:
                                        network = ipaddress.ip_network(snetwork.get("ip_prefix") or snetwork.get("ipv6_prefix"), strict=False)
                                except ValueError:
                                        log.warning("Unable to parse line: %s" % snetwork)
                                        continue

                                # Sanitize parsed networks...
                                if not self._check_parsed_network(network):
                                        continue

                                # Determine region of this network...
                                region = snetwork["region"]
                                cc = None
                                is_anycast = False

                                # Any region name starting with "us-" will get "US" country code assigned straight away...
                                if region.startswith("us-"):
                                        cc = "US"
                                elif region.startswith("cn-"):
                                        # ... same goes for China ...
                                        cc = "CN"
                                elif region == "GLOBAL":
                                        # ... funny region name for anycast-like networks ...
                                        is_anycast = True
                                elif region in aws_region_country_map:
                                        # ... assign looked up country code otherwise ...
                                        cc = aws_region_country_map[region]
                                else:
                                        # ... and bail out if we are missing something here
                                        log.warning("Unable to determine country code for line: %s" % snetwork)
                                        continue

                                # Skip networks with unknown country codes
                                if not is_anycast and validcountries and cc not in validcountries:
                                        log.warning("Skipping Amazon AWS network with bogus country '%s': %s" % \
                                                (cc, network))
                                        return

                                # Conduct SQL statement...
                                self.db.execute("""
                                        INSERT INTO network_overrides(
                                                network,
                                                country,
                                                source,
                                                is_anonymous_proxy,
                                                is_satellite_provider,
                                                is_anycast
                                        ) VALUES (%s, %s, %s, %s, %s, %s)
                                        ON CONFLICT (network) DO NOTHING""",
                                        "%s" % network,
                                        cc,
                                        "Amazon AWS IP feed",
                                        None,
                                        None,
                                        is_anycast,
                                )


        def _update_overrides_for_spamhaus_drop(self):
                downloader = location.importer.Downloader()

                ip_urls = [
                                        "https://www.spamhaus.org/drop/drop.txt",
                                        "https://www.spamhaus.org/drop/edrop.txt",
                                        "https://www.spamhaus.org/drop/dropv6.txt"
                                ]

                asn_urls = [
                                        "https://www.spamhaus.org/drop/asndrop.txt"
                                ]

                for url in ip_urls:
                        # Fetch IP list
                        f = downloader.retrieve(url)

                        # Split into lines
                        fcontent = f.readlines()

                        # Conduct a very basic sanity check to rule out CDN issues causing bogus DROP
                        # downloads.
                        if len(fcontent) > 10:
                                self.db.execute("""
                                        DELETE FROM autnum_overrides WHERE source = 'Spamhaus ASN-DROP list';
                                        DELETE FROM network_overrides WHERE source = 'Spamhaus DROP lists';
                                """)
                        else:
                                log.error("Spamhaus DROP URL %s returned likely bogus file, ignored" % url)
                                continue

                        # Iterate through every line, filter comments and add remaining networks to
                        # the override table in case they are valid...
                        with self.db.transaction():
                                for sline in fcontent:
                                        # The response is assumed to be encoded in UTF-8...
                                        sline = sline.decode("utf-8")

                                        # Comments start with a semicolon...
                                        if sline.startswith(";"):
                                                continue

                                        # Extract network and ignore anything afterwards...
                                        try:
                                                network = ipaddress.ip_network(sline.split()[0], strict=False)
                                        except ValueError:
                                                log.error("Unable to parse line: %s" % sline)
                                                continue

                                        # Sanitize parsed networks...
                                        if not self._check_parsed_network(network):
                                                log.warning("Skipping bogus network found in Spamhaus DROP URL %s: %s" % \
                                                        (url, network))
                                                continue

                                        # Conduct SQL statement...
                                        self.db.execute("""
                                                INSERT INTO network_overrides(
                                                        network,
                                                        source,
                                                        is_drop
                                                ) VALUES (%s, %s, %s)
                                                ON CONFLICT (network) DO UPDATE SET is_drop = True""",
                                                "%s" % network,
                                                "Spamhaus DROP lists",
                                                True
                                        )

                for url in asn_urls:
                        # Fetch URL
                        f = downloader.retrieve(url)

                        # Iterate through every line, filter comments and add remaining ASNs to
                        # the override table in case they are valid...
                        with self.db.transaction():
                                for sline in f.readlines():
                                        # The response is assumed to be encoded in UTF-8...
                                        sline = sline.decode("utf-8")

                                        # Comments start with a semicolon...
                                        if sline.startswith(";"):
                                                continue

                                        # Throw away anything after the first space...
                                        sline = sline.split()[0]

                                        # ... strip the "AS" prefix from it ...
                                        sline = sline.strip("AS")

                                        # ... and convert it into an integer. Voila.
                                        asn = int(sline)

                                        # Filter invalid ASNs...
                                        if not self._check_parsed_asn(asn):
                                                log.warning("Skipping bogus ASN found in Spamhaus DROP URL %s: %s" % \
                                                        (url, asn))
                                                continue

                                        # Conduct SQL statement...
                                        self.db.execute("""
                                                INSERT INTO autnum_overrides(
                                                        number,
                                                        source,
                                                        is_drop
                                                ) VALUES (%s, %s, %s)
                                                ON CONFLICT (number) DO UPDATE SET is_drop = True""",
                                                "%s" % asn,
                                                "Spamhaus ASN-DROP list",
                                                True
                                        )

        @staticmethod
        def _parse_bool(block, key):
                val = block.get(key)

                # There is no point to proceed when we got None
                if val is None:
                        return

                # Convert to lowercase
                val = val.lower()

                # True
                if val in ("yes", "1"):
                        return True

                # False
                if val in ("no", "0"):
                        return False

                # Default to None
                return None

        @property
        def countries(self):
                # Fetch all valid country codes to check parsed networks aganist
                rows = self.db.query("SELECT * FROM countries ORDER BY country_code")

                # Return all countries
                return [row.country_code for row in rows]

        def handle_import_countries(self, ns):
                with self.db.transaction():
                        # Drop all data that we have
                        self.db.execute("TRUNCATE TABLE countries")

                        for file in ns.file:
                                for line in file:
                                        line = line.rstrip()

                                        # Ignore any comments
                                        if line.startswith("#"):
                                                continue

                                        try:
                                                country_code, continent_code, name = line.split(maxsplit=2)
                                        except:
                                                log.warning("Could not parse line: %s" % line)
                                                continue

                                        self.db.execute("INSERT INTO countries(country_code, name, continent_code) \
                                                VALUES(%s, %s, %s) ON CONFLICT DO NOTHING", country_code, name, continent_code)


def split_line(line):
        key, colon, val = line.partition(":")

        # Strip any excess space
        key = key.strip()
        val = val.strip()

        return key, val

def main():
        # Run the command line interface
        c = CLI()
        c.run()

main()