hblock

#!/usr/bin/env bash
#
# Simple ad- and malware-blocking-list builder for dnsmasq.
#
# Inspired by hostblock (http://gaenserich.github.com/hostsblock)

(($#)) &&
    exec -- sudo -- "$(type -P "${BASH_SOURCE[0]}")"

typeset -x \
    LC_ALL=C \
    hblock_cachedir=${TMPDIR:-/tmp}/hostfiles \
    hblock_tmpdir=${TMPDIR:-/tmp}/hblock \
    hblock_white=/home/user1/etc/hblock/white.txt

#hostfile_regular=/etc/hosts.regular
hblock_hlist=/home/user1/etc/hblock/hlist.txt
hblock_black=/home/user1/etc/hblock/black.txt
hostfile_block=/etc/hosts.block

function __hblock_do {
    typeset outfile=${1//http:\/\//}
    outfile=${outfile//[\/\%\&\+\?\=\\]/\.}

    exec -- wget --no-verbose \
        --connect-timeout=3 \
        --content-on-error \
        --dns-timeout=3 \
        --ignore-length \
        --inet4-only \
        --no-cache \
        --no-cookies \
        --no-http-keep-alive \
        --read-timeout=3 \
        --tries=1 \
        -O - \
        "$1" |
        exec -- tee "$hblock_cachedir/$outfile.dirty" |
        exec -- sed -rn '
            /^(0.0.0.0|127.0.0.1)/ {
                s/^127.0.0.1/0.0.0.0/;
                s/[[:space:]][[:space:]]*/ /g;
                s/[[:space:]]#.*$//;
                s/[[:space:]]*$//;
                s/^$//;
                p
            }
        ' |
        exec -- grep -E -v -f "$hblock_white" >"$hblock_tmpdir/$outfile.clean"
}
typeset -xf __hblock_do

trap "exec -- rm -fr -- '$hblock_tmpdir'; exit 0" INT TERM QUIT EXIT
command -- mkdir -p -- "$hblock_cachedir" "$hblock_tmpdir"

## Do the thing.
command -- xargs \
    -a "$hblock_hlist" \
    -n 1 \
    -P 0 \
    bash -c '__hblock_do "$@"' --

command -- cat -- "$hblock_black" <(
    echo
    echo
    exec -- sort -u -- "$hblock_tmpdir/"*.clean
) >"$hostfile_block"

command -- chmod 644 "$hostfile_block" /etc/resolv-dnsmasq.conf
command -- rm -f /var/run/dnsmasq/resolv.conf /run/dnsmasq/resolv.conf

exec -- systemctl restart dnsmasq

# vim: set ft=zsh :