zapret/blockcheck.sh
2021-12-08 16:30:21 +03:00

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#!/bin/sh
EXEDIR="$(dirname "$0")"
EXEDIR="$(cd "$EXEDIR"; pwd)"
ZAPRET_BASE="$EXEDIR"
[ -n "$QNUM" ] || QNUM=59780
[ -n "$NFQWS" ] || NFQWS="$ZAPRET_BASE/nfq/nfqws"
[ -n "$MDIG" ] || MDIG="$ZAPRET_BASE/mdig/mdig"
[ -n "$DESYNC_MARK" ] || DESYNC_MARK=0x40000000
DOMAIN=rutracker.org
CURL_MAX_TIME=5
MIN_TTL=1
MAX_TTL=12
HDRTEMP=/tmp/zapret-hdr.txt
ECHON="echo -n"
DNSCHECK_DNS="8.8.8.8 1.1.1.1 77.88.8.8"
DNSCHECK_DOM="pornhub.com putinhuylo.com rutracker.org nnmclub.to protonmail.com"
DNSCHECK_DIG1=/tmp/dig1.txt
DNSCHECK_DIG2=/tmp/dig2.txt
DNSCHECK_DIGS=/tmp/digs.txt
exists()
{
which $1 >/dev/null 2>/dev/null
}
killwait()
{
# $1 - signal (-9, -2, ...)
# $2 - pid
kill $1 $2
# suppress job kill message
wait $2 2>/dev/null
}
exitp()
{
local A
echo
echo press enter to continue
read A
exit $1
}
read_yes_no()
{
# $1 - default (Y/N)
local A
read A
[ -z "$A" ] || ([ "$A" != "Y" ] && [ "$A" != "y" ] && [ "$A" != "N" ] && [ "$A" != "n" ]) && A=$1
[ "$A" = "Y" ] || [ "$A" = "y" ] || [ "$A" = "1" ]
}
ask_yes_no()
{
# $1 - default (Y/N or 0/1)
# $2 - text
local DEFAULT=$1
[ "$1" = "1" ] && DEFAULT=Y
[ "$1" = "0" ] && DEFAULT=N
[ -z "$DEFAULT" ] && DEFAULT=N
$ECHON "$2 (default : $DEFAULT) (Y/N) ? "
read_yes_no $DEFAULT
}
ask_yes_no_var()
{
# $1 - variable name for answer : 0/1
# $2 - text
local DEFAULT
eval DEFAULT="\$$1"
if ask_yes_no "$DEFAULT" "$2"; then
eval $1=1
else
eval $1=0
fi
}
require_root()
{
echo \* checking privileges
[ $(id -u) -ne "0" ] && {
echo root is required
exists sudo && exec sudo "$0"
exists su && exec su -c "$0"
echo su or sudo not found
exitp 2
}
}
IPT()
{
$IPTABLES -C "$@" >/dev/null 2>/dev/null || $IPTABLES -I "$@"
}
IPT_DEL()
{
$IPTABLES -C "$@" >/dev/null 2>/dev/null && $IPTABLES -D "$@"
}
check_system()
{
echo \* checking system
local UNAME=$(uname)
[ "$UNAME" = "Linux" ] || {
echo not supported
exitp 5
}
}
check_prerequisites()
{
echo \* checking prerequisites
[ -x "$NFQWS" ] && [ -x "$MDIG" ] || {
echo $NFQWS or $MDIG is not available. run $ZAPRET_BASE/install_bin.sh
exitp 6
}
for prog in iptables ip6tables curl; do
exists $prog || {
echo $prog does not exist. please install
exitp 6
}
done
}
hdrfile_http_code()
{
# $1 - hdr file
sed -nre '1,1 s/^HTTP\/1\.[0,1] ([0-9]+) .*$/\1/p' "$1"
}
hdrfile_location()
{
# $1 - hdr file
# some DPIs return CRLF line ending
tr -d '\015' <"$1" | sed -nre 's/^[L|l][O|o][C|c][A|a][T|t][I|i][O|o][N|n]:[ \t]*([^ \t]*)[ \t]*$/\1/p'
}
curl_test_http()
{
# $1 - ip version : 4/6
# $2 - domain name
local code loc
curl -${1}SsD "$HDRTEMP" --max-time $CURL_MAX_TIME $CURL_OPT "http://$2" -o /dev/null 2>&1 || {
code=$?
rm -f "$HDRTEMP"
return $code
}
code=$(hdrfile_http_code "$HDRTEMP")
[ "$code" = 301 -o "$code" = 302 -o "$code" = 307 -o "$code" = 308 ] && {
loc=$(hdrfile_location "$HDRTEMP")
[ "${loc#*$2}" = "$loc" ] && {
echo suspicious redirection to : $loc
rm -f "$HDRTEMP"
return 254
}
}
rm -f "$HDRTEMP"
return 0
}
curl_test_https()
{
# $1 - ip version : 4/6
# $2 - domain name
# prevent using QUIC if available in curl
curl -${1}Ss --max-time $CURL_MAX_TIME $CURL_OPT --http1.1 "https://$2" -o /dev/null 2>&1
}
nfqws_ipt_prepare()
{
# $1 - port
IPT POSTROUTING -t mangle -p tcp --dport $1 -m mark ! --mark $DESYNC_MARK/$DESYNC_MARK -j NFQUEUE --queue-num $QNUM
}
nfqws_ipt_unprepare()
{
# $1 - port
IPT_DEL POSTROUTING -t mangle -p tcp --dport $1 -m mark ! --mark $DESYNC_MARK/$DESYNC_MARK -j NFQUEUE --queue-num $QNUM
}
nfqws_start()
{
"$NFQWS" --dpi-desync-fwmark=$DESYNC_MARK --qnum=$QNUM "$@" >/dev/null &
}
curl_test()
{
# $1 - test function
# $2 - domain
$1 $IPV $2 && {
echo '!!!!! AVAILABLE !!!!!'
return 0
}
local code=$?
if [ $code = 254 ]; then
echo UNAVAILABLE
else
echo UNAVAILABLE code=$code
fi
return $code
}
nfqws_curl_test()
{
# $1 - test function
# $2 - domain
# $3,$4,$5, ... - nfqws params
local code pid testf=$1 dom=$2
shift
shift
echo - checking nfqws "$@"
nfqws_start "$@"
pid=$!
curl_test $testf $dom
code=$?
killwait -9 $pid
return $code
}
check_domain_bypass()
{
# $1 - test function
# $2 - domain
local pid strategy tests='fake' ttls
if nfqws_curl_test $1 $2 --dpi-desync=split2; then
strategy='--dpi-desync=split2'
else
tests="$tests split fake,split"
fi
if nfqws_curl_test $1 $2 --dpi-desync=disorder2; then
[ -n "$strategy" ] || strategy='--dpi-desync=disorder2'
else
tests="$tests disorder fake,disorder"
fi
ttls=$(seq -s ' ' $MIN_TTL $MAX_TTL)
for desync in $tests; do
for ttl in $ttls; do
nfqws_curl_test $1 $2 --dpi-desync=$desync --dpi-desync-ttl=$ttl && {
[ -n "$strategy" ] || strategy="--dpi-desync=$desync --dpi-desync-ttl=$ttl"
break
}
done
done
echo
if [ -n "$strategy" ]; then
echo "!!!!! working strategy found : nfqws $strategy !!!!!"
return 0
else
echo 'working strategy not found'
return 1
fi
}
check_domain()
{
# $1 - test function
# $2 - port
# $3 - domain
echo
echo \* $1 $3
# in case was interrupted before
nfqws_ipt_unprepare $2
killall nfqws 2>/dev/null
echo "- checking without DPI bypass"
curl_test $1 $3 && return 0
echo preparing nfqws redirection
nfqws_ipt_prepare $2
check_domain_bypass $1 $3
echo clearing nfqws redirection
nfqws_ipt_unprepare $2
}
check_domain_http()
{
# $1 - domain
check_domain curl_test_http 80 $1
}
check_domain_https()
{
# $1 - domain
check_domain curl_test_https 443 $1
}
ask_params()
{
echo
echo NOTE ! this test should be run with zapret or any other bypass software disabled, without VPN
echo NOTE ! this test will kill all nfqws processes. if you have already set up zapret you will need to restart it after test is complete.
$ECHON "test this domain [ $DOMAIN ] : "
local dom
read dom
[ -n "$dom" ] && DOMAIN=$dom
$ECHON "ip protocol version [ 4 ] : "
read IPV
[ -n "$IPV" ] || IPV=4
[ "$IPV" = 4 -o "$IPV" = 6 ] || {
echo invalid ip version. should be 4 or 6.
exitp 1
}
IPTABLES=iptables
[ "$IPV" = 6 ] && IPTABLES=ip6tables
ENABLE_HTTP=1
ask_yes_no_var ENABLE_HTTP "check http"
ENABLE_HTTPS=1
ask_yes_no_var ENABLE_HTTPS "check https"
IGNORE_CA=0
CURL_OPT=
[ "$ENABLE_HTTPS" = "1" ] && {
echo on limited systems like openwrt CA certificates might not be installed to preserve space
echo in such a case curl cannot verify server certificate and you should either install ca-bundle or disable verification
echo however disabling verification will break https check if ISP does MitM attack and substitutes server certificate
ask_yes_no_var IGNORE_CA "do not verify server certificate"
[ "$IGNORE_CA" = 1 ] && CURL_OPT=-k
}
}
pingtest()
{
ping -c 1 -W 1 $1 >/dev/null
}
dnstest()
{
# $1 - dns server. empty for system resolver
nslookup w3.org $1 >/dev/null 2>/dev/null
}
find_working_public_dns()
{
for dns in $DNSCHECK_DNS; do
pingtest $dns && dnstest $dns && {
PUBDNS=$dns
return 0
}
done
return 1
}
check_dns_spoof()
{
# $1 - domain
# $2 - public DNS
echo $1 | "$EXEDIR/mdig/mdig" --family=4 >"$DNSCHECK_DIG1"
nslookup $1 $2 | sed -n '/Name:/,$p' | grep ^Address | grep -oE '([0-9]{1,3}\.){3}[0-9]{1,3}' >"$DNSCHECK_DIG2"
# check whether system resolver returns anything other than public DNS
grep -qvFf "$DNSCHECK_DIG2" "$DNSCHECK_DIG1"
}
check_dns_cleanup()
{
rm -f "$DNSCHECK_DIG1" "$DNSCHECK_DIG2" "$DNSCHECK_DIGS" 2>/dev/null
}
check_dns()
{
local C1 C2
echo \* checking DNS
[ -f "$DNSCHECK_DIGS" ] && rm -f "$DNSCHECK_DIGS"
dnstest || {
echo -- DNS is not working. It's either misconfigured or blocked or you don't have inet access.
return 1
}
echo system DNS is working
if find_working_public_dns ; then
echo comparing system resolver to public DNS : $PUBDNS
for dom in $DNSCHECK_DOM; do
if check_dns_spoof $dom $PUBDNS ; then
echo $dom : MISMATCH
echo -- system resolver :
cat "$DNSCHECK_DIG1"
echo -- $PUBDNS :
cat "$DNSCHECK_DIG2"
check_dns_cleanup
echo -- POSSIBLE DNS HIJACK DETECTED. ZAPRET WILL NOT HELP YOU IN CASE DNS IS SPOOFED !!!
echo -- DNS CHANGE OR DNSCRYPT MAY BE REQUIRED
return 1
else
echo $dom : OK
cat "$DNSCHECK_DIG1" >>"$DNSCHECK_DIGS"
fi
done
else
echo no working public DNS was found. looks like public DNS blocked.
for dom in $DNSCHECK_DOM; do echo $dom; done | "$EXEDIR/mdig/mdig" --threads=10 --family=4 >"$DNSCHECK_DIGS"
fi
echo checking resolved IP uniqueness for : $DNSCHECK_DOM
echo censor\'s DNS can return equal result for multiple blocked domains.
C1=$(wc -l <"$DNSCHECK_DIGS")
C2=$(sort -u "$DNSCHECK_DIGS" | wc -l)
[ "$C1" -eq 0 ] &&
{
echo -- DNS is not working. It's either misconfigured or blocked or you don't have inet access.
check_dns_cleanup
return 1
}
[ "$C1" = "$C2" ] ||
{
echo system dns resolver has returned equal IPs for some domains checked above \($C1 total, $C2 unique\)
echo non-unique IPs :
sort "$DNSCHECK_DIGS" | uniq -d
echo -- POSSIBLE DNS HIJACK DETECTED. ZAPRET WILL NOT HELP YOU IN CASE DNS IS SPOOFED !!!
echo -- DNSCRYPT MAY BE REQUIRED
check_dns_cleanup
return 1
}
echo all resolved IPs are unique
echo -- DNS looks good
echo -- NOTE this check is Russia targeted. In your country other domains may be blocked.
check_dns_cleanup
return 0
}
sigint()
{
# make sure we are not in a middle state that impacts connectivity
echo
echo terminating...
nfqws_ipt_unprepare 80
nfqws_ipt_unprepare 443
killall nfqws 2>/dev/null
exit 1
}
trap 'sigint' 2
check_system
check_prerequisites
require_root
check_dns
ask_params
[ "$ENABLE_HTTP" = 1 ] && check_domain_http $DOMAIN
[ "$ENABLE_HTTPS" = 1 ] && check_domain_https $DOMAIN