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|
#!/bin/sh
# adblock cgi remote script - dns based ad/abuse domain blocking
# Copyright (c) 2026 Dirk Brenken
# This is free software, licensed under the GNU General Public License v3.
# (s)hellcheck exceptions
# shellcheck disable=all
# load relevant uci options
#
nft_remote="$(uci -q get adblock.global.adb_nftremote)"
nft_macremote="$(uci -q get adblock.global.adb_nftmacremote)"
nft_remotetimeout="$(uci -q get adblock.global.adb_nftremotetimeout)"
nft_authorized="0"
# parse query
#
query_str="${QUERY_STRING}"
query_mac="${query_str#*mac=}"
query_mac="${query_mac%%&*}"
query_mode="${query_str#*mode=}"
query_mode="${query_mode%%&*}"
[ "${query_mac}" = "${query_str}" ] && query_mac=""
[ "${query_mode}" = "${query_str}" ] && query_mode=""
# URL decode helper
#
urldecode() {
printf '%b' "${1//%/\\x}"
}
# lowercase helper
#
tolower() {
local low="${1}"
low="${low//A/a}"
low="${low//B/b}"
low="${low//C/c}"
low="${low//D/d}"
low="${low//E/e}"
low="${low//F/f}"
printf '%s' "${low}"
}
# determine MAC if not provided
#
if [ -z "${query_mac}" ]; then
query_ip="${REMOTE_ADDR}"
query_mac="$(ip neigh show 2>/dev/null | awk -v ip="${query_ip}" '$1==ip {print $5; exit}' 2>/dev/null)"
else
query_mac="$(urldecode "${query_mac}")"
fi
# validate MAC address
#
case "${query_mac}" in
[0-9A-Fa-f][0-9A-Fa-f]:[0-9A-Fa-f][0-9A-Fa-f]:[0-9A-Fa-f][0-9A-Fa-f]:[0-9A-Fa-f][0-9A-Fa-f]:[0-9A-Fa-f][0-9A-Fa-f]:[0-9A-Fa-f][0-9A-Fa-f])
query_mac="$(tolower "${query_mac}")"
;;
*)
query_mac=""
;;
esac
# validate mode
#
[ "${query_mode}" = "renew" ] || query_mode=""
# output header and start html
#
printf '%s\n\n' "Content-Type: text/html"
printf '%s\n' "<!DOCTYPE html>
<html>
<head>
<meta charset=\"utf-8\">
<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">
<title>Adblock Remote Allow</title>
<style>
body {
margin: 0;
padding: 0;
background: #1a1a1a;
color: #e5e5e5;
font-family: 'Open Sans', sans-serif;
text-align: center;
}
.container {
max-width: 600px;
margin: 2rem auto;
padding: 1.5rem;
background: #2b2b2b;
border-radius: 10px;
box-shadow: 0 0 10px rgba(0,0,0,0.4);
}
h1 {
font-size: 1.6rem;
margin-bottom: 1rem;
color: #5fa8ff;
}
.msg {
padding: 1rem;
border-radius: 8px;
margin-bottom: 1.5rem;
font-size: 1.2rem;
line-height: 1.5;
}
.ok {
background: #223344;
color: #8fc7ff;
}
.err {
background: #442222;
color: #ff8f8f;
}
.btn {
display: inline-block;
padding: 0.8rem 1.2rem;
background: #4da3ff;
color: #1a1a1a;
border-radius: 8px;
text-decoration: none;
font-size: 1.1rem;
font-weight: bold;
margin-top: 1rem;
}
.btn:hover {
background: #6bb6ff;
}
.spinner {
margin: 1.5rem auto;
width: 40px;
height: 40px;
border: 4px solid #4da3ff33;
border-top-color: #4da3ff;
border-radius: 50%;
animation: spin 0.8s linear infinite;
}
@keyframes spin {
to { transform: rotate(360deg); }
}
</style>
<script>
let refreshTimer = null;
function startRefresh() {
stopRefresh();
refreshTimer = setTimeout(function() { window.location.reload(); }, 5000);
}
function stopRefresh() {
if (refreshTimer !== null) {
clearTimeout(refreshTimer);
refreshTimer = null;
}
}
</script>
</head>
<body>
<div class=\"container\">
<h1>Adblock Remote Allow</h1>
"
# check if remote allow is enabled and MAC addresses are configured
#
if [ "${nft_remote}" != "1" ] || [ -z "${nft_macremote}" ]; then
printf '%s\n' "
<div class=\"msg err\">
Adblock Remote Allow is not enabled or no MAC addresses configured
</div>
</div></body></html>"
exit 0
fi
if [ -z "${query_mac}" ]; then
printf '%s\n' "
<div class=\"msg err\">
MAC address could not be determined
</div>
</div></body></html>"
exit 0
fi
# check MAC authorization
#
nft_macremote="$(tolower "${nft_macremote}")"
case " ${nft_macremote} " in
*" ${query_mac} "*)
nft_authorized="1"
;;
esac
if [ "${nft_authorized}" = "0" ]; then
printf '%s\n' "
<div class=\"msg err\">
This device (${query_mac}) is not registered for Adblock Remote Allow
</div>
</div></body></html>"
exit 0
fi
# extract remaining timeout
#
remaining="$(nft list set inet adblock mac_remote 2>/dev/null |
awk -v mac="${query_mac}" '
$0 ~ mac {
for (i = 1; i <= NF; i++) {
if ($i == "expires") {
val = $(i+1)
gsub(/[,}]/, "", val)
sub(/s.*/, "s", val)
print val
exit
}
}
}
')"
# show renew option
#
if [ -z "${query_mode}" ] && [ -z "${remaining}" ]; then
printf '%s\n' "<script>stopRefresh();</script>
<div class=\"msg ok\">
This device currently does not bypass ad blocking<br>
<a class=\"btn\" href=\"?mac=${query_mac}&mode=renew\">Bypass</a>
</div>
</div></body></html>"
exit 0
fi
# add MAC and redirect to main page to show remaining time
#
if [ -z "${remaining}" ] && [ "${query_mode}" = "renew" ]; then
printf '%s\n' "
<div class=\"msg ok\">
Adding device...<br>
<div class=\"spinner\"></div>
</div>
</div></body></html>"
nft add element inet adblock mac_remote "{ ${query_mac//[!0-9a-f:]/} }" >/dev/null 2>&1
printf '%s\n' "<script>window.location.href='?mac=${query_mac}';</script>"
exit 0
fi
# show remaining time
#
printf '%s\n' "
<div class=\"msg ok\">
This device temporarily bypasses ad blocking<br>
Remaining time: ${remaining:-${nft_remotetimeout}m}
</div>
<script>startRefresh();</script>
</div></body></html>"
exit 0
|
