Process LACNIC geofeed as well

This improves country code accurarcy for suballocations within IP space
managed by LACNIC, as the delegated-extended-latest file only provides
country code information at the top level of an allocated network.

Sadly, lacnic.db.gz does not contain descriptions or names of Autonomous
Systems within the space maintained by LACNIC.
Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

src/python/importer.py

@@ -53,7 +53,9 @@ WHOIS_SOURCES = {
 		],
 
 	# Latin America and Caribbean Network Information Centre
-	# XXX ???
+	"LACNIC": [
+		"https://ftp.lacnic.net/lacnic/dbase/lacnic.db.gz"
+		],
 
 	# Réseaux IP Européens
 	"RIPE": [

src/python/location-importer.in

@@ -681,6 +681,35 @@ class CLI(object):
 				# 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 = len(start_address[0].split("."))
+
+						# 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 == 2:
+							start_address = start_address[0] + ".0.0/" + start_address[1]
+						elif ldigits == 3:
+							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)