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#!/bin/bash
### Simple shell script to create a list of IPs suitable for the Nginx
### geo module http://nginx.org/en/docs/http/ngx_http_geo_module.html
### based on the Spamhaus DROP and EDROP lists. See
### http://www.spamhaus.org/drop.
SCRIPTNAME=${0##*/}
CURL=$(command -v curl) || exit 0
## The lists URIs and respective filenames.
DROP_URI=http://www.spamhaus.org/drop/drop.txt
DROP_FILENAME=$(basename $DROP_URI)
EDROP_URI=http://www.spamhaus.org/drop/edrop.txt
EDROP_FILENAME=$(basename $EDROP_URI)
function print_usage() {
echo "Usage: $SCRIPTNAME [output file]"
}
## Get the drop list using cURL.
## $1: the list URI.
function get_drop_list() {
$CURL -s -O $1
}
## Get the expire date in UNIX epoch format.
## $1: the list file.
function get_list_expire_date() {
echo $(date --date="$(sed -n 's/^.*Expires:\(.*\)$/\1/p' $1)" '+%s')
}
## Get the list date.
## $1: the list file.
function get_list_date() {
echo $(date --date="$(sed -n 's/^.*Last-Modified:\(.*\)$/\1/p' $1)" '+%s')
}
## Format the list according to Nginx geo module format.
## $1: the list file.
function format_geo_ips() {
sed -e '/^;/d' -e 's/;/1; #/g' $1
}
## Get the list headers. Last-Modified and Expires date.
## $1: the list file.
function print_list_headers() {
sed -n 's/^; \(.*\)$/# \1/p' $1
}
## Process each list.
## $1: output filename.
## $2: list filename.
## $3: list URI.
function process_lists() {
get_drop_list $3
## Write the DROP/EDROP list file for Nginx geo.
if [ "$4" = "append" ]; then
print_list_headers $2 >> $1
else
print_list_headers $2 > $1
fi
format_geo_ips $2 >> $1
}
## Echo the number of added lines to a particular file.
## #1: drop list file.
function print_added_lines() {
echo $(wc -l $1) | awk '{print "File " $2 " adding " $1 - 3 " networks"}'
}
## Check the number of arguments.
if [ $# -gt 1 ]; then
print_usage
exit 1
fi
## Get the output filename.
OUTPUT_FILE=${1-/etc/nginx/drop_list.conf}
WRITTEN_FILE="no"
## If the file doesn't exist create it and process the lists.
if [ ! -f $OUTPUT_FILE ]; then
process_lists $OUTPUT_FILE $DROP_FILENAME $DROP_URI
print_added_lines $DROP_FILENAME
process_lists $OUTPUT_FILE $EDROP_FILENAME $EDROP_URI "append"
print_added_lines $EDROP_FILENAME
WRITTEN_FILE="yes"
fi
## Grab the drop files if the Expire date of the current list has
## passed already.
if [ "$(get_list_expire_date $DROP_FILENAME)" -lt "$(date '+%s')" ]; then
process_lists $OUTPUT_FILE $DROP_FILENAME $DROP_URI
print_added_lines $DROP_FILENAME
WRITTEN_FILE="yes"
fi
## Ditto for the extended drop list.
if [ "$(get_list_expire_date $EDROP_FILENAME)" -lt "$(date '+%s')" ]; then
process_lists $OUTPUT_FILE $EDROP_FILENAME $EDROP_URI "append"
print_added_lines $EDROP_FILENAME
WRITTEN_FILE="yes"
fi
## Write a message about the writing of the file.
if [ "$WRITTEN_FILE" = "yes" ]; then
echo "File $OUTPUT_FILE written."
fi
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