Switch GeoIP database from MaxMind to IP2Location.

The IP2Location data is licensed under CC BY-SA, which
allows us to distribute the database with releases.

fetch-geoip.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+# Download the IP2Location country database for use by the game server
+
+####
+# This file must stay /bin/sh and POSIX compliant for macOS and BSD portability.
+# Copy-paste the entire script into http://shellcheck.net to check.
+####
+
+# Set the working directory to the location of this script
+cd "$(dirname "$0")" || exit 1
+
+# Database does not exist or is older than 30 days.
+if [ -z "$(find . -path ./IP2LOCATION-LITE-DB1.IPV6.BIN.ZIP -mtime -30 -print)" ]; then
+	rm -f IP2LOCATION-LITE-DB1.IPV6.BIN.ZIP
+	echo "Downloading IP2Location GeoIP database."
+	if command -v curl >/dev/null 2>&1; then
+		curl -s -L -O https://download.ip2location.com/lite/IP2LOCATION-LITE-DB1.IPV6.BIN.ZIP || echo "Warning: Download failed"
+	else
+		wget -cq https://download.ip2location.com/lite/IP2LOCATION-LITE-DB1.IPV6.BIN.ZIP || echo "Warning: Download failed"
+	fi
+fi