add ipset script

cf-ipset.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+TEMP=$(mktemp)
+IPSET_NAME="$1"
+
+ipset_exists() {
+	ipset -L "$1" >/dev/null 2>/dev/null
+}
+
+die() {
+	echo "error: $@"
+	[ -f "$TEMP" ] && rm "$TEMP"
+	exit 1
+}
+
+[ -z "$IPSET_NAME" ] && {
+	echo "usage: $0 IPSET_NAME"
+	exit
+}
+
+if ! ipset_exists "$IPSET_NAME"; then
+	echo "warn: set $IPSET_NAME doesn't exists, creating it for you..."
+	ipset create $IPSET_NAME hash:net || die "failed to create ipset"
+fi
+
+list=$(curl -s "https://www.cloudflare.com/ips-v4")
+[ -z "$list" ] && die "failed to fetch cf networks"
+
+ipset flush $IPSET_NAME || die "failed to flush $IPSET_NAME"
+for net in $list; do
+	ipset add $IPSET_NAME $net || echo "error: failed to add $net to $IPSET_NAME"
+done