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4e77f514a6
zapret/blockcheck.sh
bol-van 4e77f514a6 blockcheck: windows compatible nslookup
2024-04-28 11:32:38 +03:00

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#!/bin/sh
EXEDIR="$(dirname "$0")"
EXEDIR="$(cd "$EXEDIR"; pwd)"
ZAPRET_BASE="$EXEDIR"
[ -f "$ZAPRET_BASE/config" ] && . "$ZAPRET_BASE/config"
. "$ZAPRET_BASE/common/base.sh"
. "$ZAPRET_BASE/common/dialog.sh"
. "$ZAPRET_BASE/common/elevate.sh"
. "$ZAPRET_BASE/common/fwtype.sh"
. "$ZAPRET_BASE/common/virt.sh"
QNUM=${QNUM:-59780}
SOCKS_PORT=${SOCKS_PORT:-1993}
TPWS_UID=${TPWS_UID:-1}
TPWS_GID=${TPWS_GID:-3003}
NFQWS=${NFQWS:-${ZAPRET_BASE}/nfq/nfqws}
DVTWS=${DVTWS:-${ZAPRET_BASE}/nfq/dvtws}
WINWS=${WINWS:-${ZAPRET_BASE}/nfq/winws}
TPWS=${TPWS:-${ZAPRET_BASE}/tpws/tpws}
MDIG=${MDIG:-${ZAPRET_BASE}/mdig/mdig}
DESYNC_MARK=0x10000000
IPFW_RULE_NUM=${IPFW_RULE_NUM:-1}
IPFW_DIVERT_PORT=${IPFW_DIVERT_PORT:-59780}
DOMAINS=${DOMAINS:-rutracker.org}
CURL_MAX_TIME=${CURL_MAX_TIME:-3}
CURL_MAX_TIME_QUIC=${CURL_MAX_TIME_QUIC:-$CURL_MAX_TIME}
MIN_TTL=${MIN_TTL:-1}
MAX_TTL=${MAX_TTL:-12}
USER_AGENT=${USER_AGENT:-Mozilla}
HTTP_PORT=${HTTP_PORT:-80}
HTTPS_PORT=${HTTPS_PORT:-443}
QUIC_PORT=${QUIC_PORT:-443}
HDRTEMP=/tmp/zapret-hdr.txt
NFT_TABLE=blockcheck
DNSCHECK_DNS=${DNSCHECK_DNS:-8.8.8.8 1.1.1.1 77.88.8.1}
DNSCHECK_DOM=${DNSCHECK_DOM:-pornhub.com putinhuylo.com rutracker.org www.torproject.org bbc.com}
DNSCHECK_DIG1=/tmp/dig1.txt
DNSCHECK_DIG2=/tmp/dig2.txt
DNSCHECK_DIGS=/tmp/digs.txt
unset PF_STATUS
PF_RULES_SAVE=/tmp/pf-zapret-save.conf
unset ALL_PROXY
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 $1
}
pf_is_avail()
{
[ -c /dev/pf ]
}
pf_status()
{
pfctl -qsi | sed -nre "s/^Status: ([^ ]+).*$/\1/p"
}
pf_is_enabled()
{
[ "$(pf_status)" = Enabled ]
}
pf_save()
{
PF_STATUS=0
pf_is_enabled && PF_STATUS=1
[ "$UNAME" = "OpenBSD" ] && pfctl -sr >"$PF_RULES_SAVE"
}
pf_restore()
{
[ -n "$PF_STATUS" ] || return
case "$UNAME" in
OpenBSD)
if [ -f "$PF_RULES_SAVE" ]; then
pfctl -qf "$PF_RULES_SAVE"
else
echo | pfctl -qf -
fi
;;
Darwin)
# it's not possible to save all rules in the right order. hard to reorder. if not ordered pf will refuse to load conf.
pfctl -qf /etc/pf.conf
;;
esac
if [ "$PF_STATUS" = 1 ]; then
pfctl -qe
else
pfctl -qd
fi
}
pf_clean()
{
rm -f "$PF_RULES_SAVE"
}
opf_dvtws_anchor()
{
# $1 - tcp/udp
# $2 - port
local family=inet
[ "$IPV" = 6 ] && family=inet6
echo "set reassemble no"
[ "$1" = tcp ] && echo "pass in quick $family proto $1 from port $2 flags SA/SA divert-packet port $IPFW_DIVERT_PORT no state"
echo "pass in quick $family proto $1 from port $2 no state"
echo "pass out quick $family proto $1 to port $2 divert-packet port $IPFW_DIVERT_PORT no state"
echo "pass"
}
opf_prepare_dvtws()
{
# $1 - tcp/udp
# $2 - port
opf_dvtws_anchor $1 $2 | pfctl -qf -
pfctl -qe
}
cleanup()
{
case "$UNAME" in
OpenBSD)
pf_clean
;;
esac
}
IPT()
{
$IPTABLES -C "$@" >/dev/null 2>/dev/null || $IPTABLES -I "$@"
}
IPT_DEL()
{
$IPTABLES -C "$@" >/dev/null 2>/dev/null && $IPTABLES -D "$@"
}
IPT_ADD_DEL()
{
on_off_function IPT IPT_DEL "$@"
}
IPFW_ADD()
{
ipfw -qf add $IPFW_RULE_NUM "$@"
}
IPFW_DEL()
{
ipfw -qf delete $IPFW_RULE_NUM 2>/dev/null
}
ipt6_has_raw()
{
ip6tables -nL -t raw >/dev/null 2>/dev/null
}
ipt6_has_frag()
{
ip6tables -A OUTPUT -m frag 2>/dev/null || return 1
ip6tables -D OUTPUT -m frag 2>/dev/null
}
ipt_has_nfq()
{
# cannot just check /proc/net/ip_tables_targets because of iptables-nft or modules not loaded yet
iptables -A OUTPUT -t mangle -p 255 -j NFQUEUE --queue-num $QNUM --queue-bypass 2>/dev/null || return 1
iptables -D OUTPUT -t mangle -p 255 -j NFQUEUE --queue-num $QNUM --queue-bypass 2>/dev/null
return 0
}
nft_has_nfq()
{
local res=1
nft delete table ${NFT_TABLE}_test 2>/dev/null
nft add table ${NFT_TABLE}_test 2>/dev/null && {
nft add chain ${NFT_TABLE}_test test
nft add rule ${NFT_TABLE}_test test queue num $QNUM bypass 2>/dev/null && res=0
nft delete table ${NFT_TABLE}_test
}
return $res
}
mdig_resolve()
{
# $1 - ip version 4/6
# $2 - hostname
# windows version of mdig outputs 0D0A line ending. remove 0D.
echo "$2" | "$MDIG" --family=$1 | head -n 1 | tr -d '\r'
}
check_system()
{
echo \* checking system
UNAME=$(uname)
SUBSYS=
local s
# can be passed FWTYPE=iptables to override default nftables preference
case "$UNAME" in
Linux)
PKTWS="$NFQWS"
PKTWSD=nfqws
linux_fwtype
[ "$FWTYPE" = iptables -o "$FWTYPE" = nftables ] || {
echo firewall type $FWTYPE not supported in $UNAME
exitp 5
}
;;
FreeBSD)
PKTWS="$DVTWS"
PKTWSD=dvtws
FWTYPE=ipfw
[ -f /etc/platform ] && read SUBSYS </etc/platform
;;
OpenBSD)
PKTWS="$DVTWS"
PKTWSD=dvtws
FWTYPE=opf
;;
Darwin)
PKTWS="$DVTWS"
PKTWSD=dvtws
FWTYPE=mpf
;;
CYGWIN*)
UNAME=CYGWIN
PKTWS="$WINWS"
PKTWSD=winws
FWTYPE=windivert
;;
*)
echo $UNAME not supported
exitp 5
esac
echo $UNAME${SUBSYS:+/$SUBSYS} detected
echo firewall type is $FWTYPE
}
freebsd_module_loaded()
{
# $1 - module name
kldstat -qm "${1}"
}
freebsd_modules_loaded()
{
# $1,$2,$3, ... - module names
while [ -n "$1" ]; do
freebsd_module_loaded $1 || return 1
shift
done
return 0
}
check_prerequisites()
{
echo \* checking prerequisites
[ "$UNAME" = Darwin -o -x "$PKTWS" ] && [ "$UNAME" = CYGWIN -o -x "$TPWS" ] && [ -x "$MDIG" ] || {
local target
case $UNAME in
Darwin)
target="mac"
;;
OpenBSD)
target="bsd"
;;
esac
echo $PKTWS or $TPWS or $MDIG is not available. run \"$ZAPRET_BASE/install_bin.sh\" or \`make -C \"$ZAPRET_BASE\" $target\`
exitp 6
}
local prog progs='curl'
case "$UNAME" in
Linux)
case "$FWTYPE" in
iptables)
progs="$progs iptables ip6tables"
ipt_has_nfq || {
echo NFQUEUE iptables or ip6tables target is missing. pls install modules.
exitp 6
}
;;
nftables)
nft_has_nfq || {
echo nftables queue support is not available. pls install modules.
exitp 6
}
;;
esac
;;
FreeBSD)
progs="$progs ipfw"
freebsd_modules_loaded ipfw ipdivert || {
echo ipfw or ipdivert kernel module not loaded
exitp 6
}
[ "$(sysctl -qn net.inet.ip.fw.enable)" = 0 -o "$(sysctl -qn net.inet6.ip6.fw.enable)" = 0 ] && {
echo ipfw is disabled. use : ipfw enable firewall
exitp 6
}
pf_is_avail && {
pf_save
[ "$SUBSYS" = "pfSense" ] && {
# pfsense's ipfw may not work without these workarounds
sysctl net.inet.ip.pfil.outbound=ipfw,pf 2>/dev/null
sysctl net.inet.ip.pfil.inbound=ipfw,pf 2>/dev/null
sysctl net.inet6.ip6.pfil.outbound=ipfw,pf 2>/dev/null
sysctl net.inet6.ip6.pfil.inbound=ipfw,pf 2>/dev/null
pfctl -qd
pfctl -qe
pf_restore
}
}
;;
OpenBSD|Darwin)
progs="$progs pfctl"
pf_is_avail || {
echo pf is not available
exitp 6
}
# no divert sockets in MacOS
[ "$UNAME" = "Darwin" ] && SKIP_PKTWS=1
pf_save
;;
CYGWIN)
SKIP_TPWS=1
;;
esac
for prog in $progs; do
exists $prog || {
echo $prog does not exist. please install
exitp 6
}
done
if exists nslookup; then
LOOKUP=nslookup
elif exists host; then
LOOKUP=host
else
echo nslookup or host does not exist. please install
exitp 6
fi
}
curl_translate_code()
{
# $1 - code
printf $1
case $1 in
0) printf ": ok"
;;
1) printf ": unsupported protocol"
;;
2) printf ": early initialization code failed"
;;
3) printf ": the URL was not properly formatted"
;;
4) printf ": feature not supported by libcurl"
;;
5) printf ": could not resolve proxy"
;;
6) printf ": could not resolve host"
;;
7) printf ": could not connect"
;;
8) printf ": invalid server reply"
;;
9) printf ": remote access denied"
;;
27) printf ": out of memory"
;;
28) printf ": operation timed out"
;;
35) printf ": SSL connect error"
;;
esac
}
curl_supports_tls13()
{
local r
curl --tlsv1.3 -Is -o /dev/null --max-time 1 http://127.0.0.1:65535 2>/dev/null
# return code 2 = init failed. likely bad command line options
[ $? = 2 ] && return 1
# curl can have tlsv1.3 key present but ssl library without TLS 1.3 support
# this is online test because there's no other way to trigger library incompatibility case
curl --tlsv1.3 --max-time $CURL_MAX_TIME -Is -o /dev/null https://w3.org 2>/dev/null
r=$?
[ $r != 4 -a $r != 35 ]
}
curl_supports_tlsmax()
{
# supported only in OpenSSL and LibreSSL
curl --version | grep -Fq -e OpenSSL -e LibreSSL -e GnuTLS || return 1
# supported since curl 7.54
curl --tls-max 1.2 -Is -o /dev/null --max-time 1 http://127.0.0.1:65535 2>/dev/null
# return code 2 = init failed. likely bad command line options
[ $? != 2 ]
}
curl_supports_connect_to()
{
curl --connect-to 127.0.0.1:: -o /dev/null --max-time 1 http://127.0.0.1:65535 2>/dev/null
[ "$?" != 2 ]
}
curl_supports_http3()
{
# if it has http3 : curl: (3) HTTP/3 requested for non-HTTPS URL
# otherwise : curl: (2) option --http3-only: is unknown
curl --connect-to 127.0.0.1:: -o /dev/null --max-time 1 --http3-only http://127.0.0.1:65535 2>/dev/null
[ "$?" != 2 ]
}
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' <"$1" | sed -nre 's/^[Ll][Oo][Cc][Aa][Tt][Ii][Oo][Nn]:[ ]*([^ ]*)[ ]*$/\1/p'
}
curl_connect_to()
{
# $1 - ip version : 4/6
# $2 - domain name
# $3 - port
local ip=$(mdig_resolve $1 $2)
[ -n "$ip" ] && echo "--connect-to $2::[$ip]${3:+:$3}"
}
curl_with_dig()
{
# $1 - ip version : 4/6
# $2 - domain name
# $3 - port
# $4+ - curl params
local connect_to=$(curl_connect_to $1 $2 $3)
[ -n "$connect_to" ] || {
echo "could not resolve ipv$1 $2"
return 6
}
shift ; shift ; shift
ALL_PROXY="$ALL_PROXY" curl $connect_to "$@"
}
curl_test_http()
{
# $1 - ip version : 4/6
# $2 - domain name
local code loc
curl_with_dig $1 $2 $HTTP_PORT -SsD "$HDRTEMP" -A "$USER_AGENT" --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 "$HDRTEMP")
echo "$loc" | grep -qE "^https?://.*$2(/|$)" ||
echo "$loc" | grep -vqE '^https?://' || {
echo suspicious redirection $code to : $loc
rm -f "$HDRTEMP"
return 254
}
}
rm -f "$HDRTEMP"
[ "$code" = 400 ] && {
# this can often happen if the server receives fake packets it should not receive
echo http code $code. likely the server receives fakes.
return 254
}
return 0
}
curl_test_https_tls12()
{
# $1 - ip version : 4/6
# $2 - domain name
# do not use tls 1.3 to make sure server certificate is not encrypted
curl_with_dig $1 $2 $HTTPS_PORT -ISs -A "$USER_AGENT" --max-time $CURL_MAX_TIME $CURL_OPT --tlsv1.2 $TLSMAX12 "https://$2" -o /dev/null 2>&1
}
curl_test_https_tls13()
{
# $1 - ip version : 4/6
# $2 - domain name
# force TLS1.3 mode
curl_with_dig $1 $2 $HTTPS_PORT -ISs -A "$USER_AGENT" --max-time $CURL_MAX_TIME $CURL_OPT --tlsv1.3 $TLSMAX13 "https://$2" -o /dev/null 2>&1
}
curl_test_http3()
{
# $1 - ip version : 4/6
# $2 - domain name
# force QUIC only mode without tcp
curl_with_dig $1 $2 $QUIC_PORT -ISs -A "$USER_AGENT" --max-time $CURL_MAX_TIME_QUIC --http3-only $CURL_OPT "https://$2" -o /dev/null 2>&1
}
ipt_scheme()
{
# $1 - 1 - add , 0 - del
# $2 - tcp/udp
# $3 - port
IPT_ADD_DEL $1 OUTPUT -t mangle -p $2 --dport $3 -m mark ! --mark $DESYNC_MARK/$DESYNC_MARK -j NFQUEUE --queue-num $QNUM
# to avoid possible INVALID state drop
[ "$2" = tcp ] && IPT_ADD_DEL $1 INPUT -p $2 --sport $3 ! --syn -j ACCEPT
# for strategies with incoming packets involved (autottl)
IPT_ADD_DEL $1 OUTPUT -p $2 --dport $3 -m conntrack --ctstate INVALID -j ACCEPT
if [ "$IPV" = 6 -a -n "$IP6_DEFRAG_DISABLE" ]; then
# the only way to reliable disable ipv6 defrag. works only in 4.16+ kernels
IPT_ADD_DEL $1 OUTPUT -t raw -p $2 -m frag -j CT --notrack
elif [ "$IPV" = 4 ]; then
# enable fragments
IPT_ADD_DEL $1 OUTPUT -f -j ACCEPT
fi
# enable everything generated by nfqws (works only in OUTPUT, not in FORWARD)
# raw table may not be present
IPT_ADD_DEL $1 OUTPUT -t raw -m mark --mark $DESYNC_MARK/$DESYNC_MARK -j CT --notrack
}
nft_scheme()
{
# $1 - tcp/udp
# $2 - port
nft add table inet $NFT_TABLE
nft "add chain inet $NFT_TABLE postnat { type filter hook output priority 102; }"
nft "add rule inet $NFT_TABLE postnat meta nfproto ipv${IPV} $1 dport $2 mark and $DESYNC_MARK != $DESYNC_MARK queue num $QNUM"
# for strategies with incoming packets involved (autottl)
nft "add chain inet $NFT_TABLE prenat { type filter hook prerouting priority -102; }"
# enable everything generated by nfqws (works only in OUTPUT, not in FORWARD)
nft "add chain inet $NFT_TABLE predefrag { type filter hook output priority -402; }"
nft "add rule inet $NFT_TABLE predefrag meta nfproto ipv${IPV} mark and $DESYNC_MARK !=0 notrack"
}
pktws_ipt_prepare()
{
# $1 - tcp/udp
# $2 - port
case "$FWTYPE" in
iptables)
ipt_scheme 1 $1 $2
;;
nftables)
nft_scheme $1 $2
;;
ipfw)
# disable PF to avoid interferences
pf_is_avail && pfctl -qd
IPFW_ADD divert $IPFW_DIVERT_PORT $1 from me to any $2 proto ip${IPV} out not diverted not sockarg
;;
opf)
opf_prepare_dvtws $1 $2
;;
windivert)
WF="--wf-l3=ipv${IPV} --wf-${1}=$2"
;;
esac
}
pktws_ipt_unprepare()
{
# $1 - tcp/udp
# $2 - port
case "$FWTYPE" in
iptables)
ipt_scheme 0 $1 $2
;;
nftables)
nft delete table inet $NFT_TABLE 2>/dev/null
;;
ipfw)
IPFW_DEL
pf_is_avail && pf_restore
;;
opf)
pf_restore
;;
windivert)
unset WF
;;
esac
}
pktws_ipt_prepare_tcp()
{
# $1 - port
pktws_ipt_prepare tcp $1
case "$FWTYPE" in
iptables)
# for autottl
IPT INPUT -t mangle -p tcp --sport $1 -m connbytes --connbytes-dir=original --connbytes-mode=packets --connbytes 1:1 -j NFQUEUE --queue-num $QNUM
;;
nftables)
# for autottl
nft "add rule inet $NFT_TABLE prenat meta nfproto ipv${IPV} tcp sport $1 ct original packets 1 queue num $QNUM"
;;
ipfw)
# for autottl mode
IPFW_ADD divert $IPFW_DIVERT_PORT tcp from any $1 to me proto ip${IPV} tcpflags syn,ack in not diverted not sockarg
;;
esac
}
pktws_ipt_unprepare_tcp()
{
# $1 - port
pktws_ipt_unprepare tcp $1
case "$FWTYPE" in
iptables)
IPT_DEL INPUT -t mangle -p tcp --sport $1 -m connbytes --connbytes-dir=original --connbytes-mode=packets --connbytes 1:1 -j NFQUEUE --queue-num $QNUM
;;
esac
}
pktws_ipt_prepare_udp()
{
# $1 - port
pktws_ipt_prepare udp $1
}
pktws_ipt_unprepare_udp()
{
# $1 - port
pktws_ipt_unprepare udp $1
}
pktws_start()
{
case "$UNAME" in
Linux)
"$NFQWS" --uid $TPWS_UID:$TPWS_GID --dpi-desync-fwmark=$DESYNC_MARK --qnum=$QNUM "$@" >/dev/null &
;;
FreeBSD|OpenBSD)
"$DVTWS" --port=$IPFW_DIVERT_PORT "$@" >/dev/null &
;;
CYGWIN)
"$WINWS" $WF "$@" >/dev/null &
;;
esac
PID=$!
# give some time to initialize
minsleep
}
tpws_start()
{
"$TPWS" --uid $TPWS_UID:$TPWS_GID --socks --bind-addr=127.0.0.1 --port=$SOCKS_PORT "$@" >/dev/null &
PID=$!
# give some time to initialize
minsleep
}
ws_kill()
{
[ -z "$PID" ] || {
killwait -9 $PID 2>/dev/null
PID=
}
}
curl_test()
{
# $1 - test function
# $2 - domain
local code=0 n=0
while [ $n -lt $REPEATS ]; do
n=$(($n+1))
[ $REPEATS -gt 1 ] && printf "[attempt $n] "
if $1 "$IPV" $2 ; then
[ $REPEATS -gt 1 ] && echo 'AVAILABLE'
else
code=$?
[ "$SCANLEVEL" = quick ] && break
fi
done
if [ $code = 254 ]; then
echo "UNAVAILABLE"
elif [ $code = 0 ]; then
echo '!!!!! AVAILABLE !!!!!'
else
echo "UNAVAILABLE code=$code"
fi
return $code
}
ws_curl_test()
{
# $1 - ws start function
# $2 - test function
# $3 - domain
# $4,$5,$6, ... - ws params
local code ws_start=$1 testf=$2 dom=$3
shift
shift
shift
$ws_start "$@"
curl_test $testf $dom
code=$?
ws_kill
return $code
}
tpws_curl_test()
{
# $1 - test function
# $2 - domain
# $3,$4,$5, ... - tpws params
echo - checking tpws $3 $4 $5 $6 $7 $8 $9
local ALL_PROXY="socks5://127.0.0.1:$SOCKS_PORT"
ws_curl_test tpws_start "$@"
}
pktws_curl_test()
{
# $1 - test function
# $2 - domain
# $3,$4,$5, ... - nfqws/dvtws params
echo - checking $PKTWSD ${WF:+$WF }$3 $4 $5 $6 $7 $8 $9
ws_curl_test pktws_start "$@"
}
xxxws_curl_test_update()
{
# $1 - xxx_curl_test function
# $2 - test function
# $3 - domain
# $4,$5,$6, ... - nfqws/dvtws params
local code xxxf=$1 testf=$2 dom=$3
shift
shift
shift
$xxxf $testf $dom "$@"
code=$?
[ $code = 0 ] && strategy="${WF:+$WF }${strategy:-$@}"
return $code
}
pktws_curl_test_update()
{
xxxws_curl_test_update pktws_curl_test "$@"
}
tpws_curl_test_update()
{
xxxws_curl_test_update tpws_curl_test "$@"
}
report_append()
{
NREPORT=${NREPORT:-0}
eval REPORT_${NREPORT}=\"$@\"
NREPORT=$(($NREPORT+1))
}
report_print()
{
local n=0 s
NREPORT=${NREPORT:-0}
while [ $n -lt $NREPORT ]; do
eval s=\"\${REPORT_$n}\"
echo $s
n=$(($n+1))
done
}
report_strategy()
{
# $1 - test function
# $2 - domain
# $3 - daemon
echo
if [ -n "$strategy" ]; then
echo "!!!!! $1: working strategy found for ipv${IPV} $2 : $3 $strategy !!!!!"
echo
report_append "ipv${IPV} $2 $1 : $3 $strategy"
return 0
else
echo "$1: $3 strategy for ipv${IPV} $2 not found"
echo
report_append "ipv${IPV} $2 $1 : $3 not working"
return 1
fi
}
test_has_split()
{
contains "$1" split || contains "$1" disorder
}
test_has_fake()
{
contains "$1" fake
}
warn_fool()
{
case "$1" in
md5sig) echo 'WARNING ! although md5sig fooling worked it will not work on all sites. it typically works only on linux servers.' ;;
datanoack) echo 'WARNING ! although datanoack fooling worked it may break NAT and may only work with external IP. Additionally it may require nftables to work correctly.' ;;
esac
}
pktws_curl_test_update_vary()
{
# $1 - test function
# $2 - encrypted test : 0 = plain, 1 - encrypted with server reply risk, 2 - encrypted without server reply risk
# $3 - domain
# $4 - desync mode
# $5,$6,... - strategy
local testf=$1 sec=$2 domain=$3 desync=$4 zerofake split fake
shift; shift; shift; shift
zerofake=http
[ "$sec" = 0 ] || zerofake=tls
zerofake="--dpi-desync-fake-$zerofake=0x00000000"
for fake in '' $zerofake ; do
for split in '' '--dpi-desync-split-pos=1' ; do
pktws_curl_test_update $testf $domain --dpi-desync=$desync "$@" $fake $split && return 0
# split-pos=1 is meaningful for DPIs searching for 16 03 in TLS. no reason to apply to http
[ "$sec" = 1 ] || break
test_has_split $desync || break
done
test_has_fake $desync || break
done
return 1
}
pktws_check_domain_http_bypass_()
{
# $1 - test function
# $2 - encrypted test : 0 = plain, 1 - encrypted with server reply risk, 2 - encrypted without server reply risk
# $3 - domain
local tests='fake' ret ok ttls s f e desync pos fooling frag sec="$2" delta
[ "$sec" = 0 ] && {
for s in '--hostcase' '--hostspell=hoSt' '--hostnospace' '--domcase'; do
pktws_curl_test_update $1 $3 $s
done
}
s="--dpi-desync=split2"
ok=0
pktws_curl_test_update $1 $3 $s
ret=$?
[ "$ret" = 0 ] && {
[ "$SCANLEVEL" = quick ] && return
ok=1
}
[ "$ret" != 0 -o "$SCANLEVEL" = force ] && {
[ "$sec" = 0 ] && pktws_curl_test_update $1 $3 $s --hostcase && [ "$SCANLEVEL" = quick ] && return
for pos in 1 3 4 5 10 50; do
s="--dpi-desync=split2 --dpi-desync-split-pos=$pos"
if pktws_curl_test_update $1 $3 $s; then
[ "$SCANLEVEL" = quick ] && return
ok=1
[ "$SCANLEVEL" = force ] || break
elif [ "$sec" = 0 ]; then
pktws_curl_test_update $1 $3 $s --hostcase && [ "$SCANLEVEL" = quick ] && return
fi
done
}
[ "$ok" = 1 -a "$SCANLEVEL" != force ] || tests="$tests split fake,split2 fake,split"
pktws_curl_test_update $1 $3 --dpi-desync=disorder2
ret=$?
[ "$ret" = 0 -a "$SCANLEVEL" = quick ] && return
[ "$ret" != 0 -o "$SCANLEVEL" = force ] && {
pktws_curl_test_update $1 $3 --dpi-desync=disorder2 --dpi-desync-split-pos=1
ret=$?
[ "$ret" = 0 -a "$SCANLEVEL" = quick ] && return
}
[ "$ret" != 0 -o "$SCANLEVEL" = force ] && tests="$tests disorder fake,disorder2 fake,disorder"
ttls=$(seq -s ' ' $MIN_TTL $MAX_TTL)
for e in '' '--wssize 1:6'; do
[ -n "$e" ] && {
pktws_curl_test_update $1 $3 $e && [ "$SCANLEVEL" = quick ] && return
for desync in split2 disorder2; do
pktws_curl_test_update_vary $1 $2 $3 $desync $e && [ "$SCANLEVEL" = quick ] && return
done
}
for desync in $tests; do
for ttl in $ttls; do
pktws_curl_test_update_vary $1 $2 $3 $desync --dpi-desync-ttl=$ttl $e && {
[ "$SCANLEVEL" = quick ] && return
break
}
done
f=
[ "$UNAME" = "OpenBSD" ] || f="badsum"
f="$f badseq datanoack md5sig"
[ "$IPV" = 6 ] && f="$f hopbyhop hopbyhop2"
for fooling in $f; do
pktws_curl_test_update_vary $1 $2 $3 $desync --dpi-desync-fooling=$fooling $e && {
warn_fool $fooling
[ "$SCANLEVEL" = quick ] && return
}
done
done
[ "$IPV" = 6 ] && {
f="hopbyhop hopbyhop,split2 hopbyhop,disorder2 destopt destopt,split2 destopt,disorder2"
[ -n "$IP6_DEFRAG_DISABLE" ] && f="$f ipfrag1 ipfrag1,split2 ipfrag1,disorder2"
for desync in $f; do
pktws_curl_test_update_vary $1 $2 $3 $desync $e && [ "$SCANLEVEL" = quick ] && return
done
}
for desync in $tests; do
ok=0
for delta in 1 2 3 4 5; do
pktws_curl_test_update_vary $1 $2 $3 $desync --dpi-desync-ttl=1 --dpi-desync-autottl=$delta $e && ok=1
done
[ "$ok" = 1 ] &&
{
echo "WARNING ! although autottl worked it requires testing on multiple domains to find out reliable delta"
echo "WARNING ! if a reliable delta cannot be found it's a good idea not to use autottl"
[ "$SCANLEVEL" = quick ] && return
}
done
s="http_iana_org.bin"
[ "$sec" = 0 ] || s="tls_clienthello_iana_org.bin"
for desync in syndata syndata,split2 syndata,disorder2 syndata,split2 syndata,disorder2 ; do
pktws_curl_test_update_vary $1 $2 $3 $desync $e && [ "$SCANLEVEL" = quick ] && return
pktws_curl_test_update_vary $1 $2 $3 $desync --dpi-desync-fake-syndata="$ZAPRET_BASE/files/fake/$s" $e && [ "$SCANLEVEL" = quick ] && return
done
# do not do wssize test for http and TLS 1.3. it's useless
[ "$sec" = 1 ] || break
done
}
pktws_check_domain_http_bypass()
{
# $1 - test function
# $2 - encrypted test : 0 = plain, 1 - encrypted with server reply risk, 2 - encrypted without server reply risk
# $3 - domain
local strategy
pktws_check_domain_http_bypass_ "$@"
report_strategy $1 $3 $PKTWSD
}
pktws_check_domain_http3_bypass_()
{
# $1 - test function
# $2 - domain
local f desync frag tests rep
for rep in '' 2 5 10 20; do
pktws_curl_test_update $1 $2 --dpi-desync=fake ${rep:+--dpi-desync-repeats=$rep} && [ "$SCANLEVEL" != force ] && {
[ "$SCANLEVEL" = quick ] && return
break
}
done
[ "$IPV" = 6 ] && {
f="hopbyhop destopt"
[ -n "$IP6_DEFRAG_DISABLE" ] && f="$f ipfrag1"
for desync in $f; do
pktws_curl_test_update $1 $2 --dpi-desync=$desync && [ "$SCANLEVEL" = quick ] && return
done
}
# OpenBSD has checksum issues with fragmented packets
[ "$UNAME" != "OpenBSD" ] && [ "$IPV" = 4 -o -n "$IP6_DEFRAG_DISABLE" ] && {
for frag in 8 16 24 32 40 64; do
tests="ipfrag2"
[ "$IPV" = 6 ] && tests="$tests hopbyhop,ipfrag2 destopt,ipfrag2"
for desync in $tests; do
pktws_curl_test_update $1 $2 --dpi-desync=$desync --dpi-desync-ipfrag-pos-udp=$frag && [ "$SCANLEVEL" = quick ] && return
done
done
}
}
pktws_check_domain_http3_bypass()
{
# $1 - test function
# $2 - domain
local strategy
pktws_check_domain_http3_bypass_ "$@"
report_strategy $1 $2 $PKTWSD
}
warn_mss()
{
echo 'WARNING ! although mss worked it may not work on all sites and will likely cause significant slowdown. it may only be required for TLS1.2, not TLS1.3'
}
tpws_check_domain_http_bypass_()
{
# $1 - test function
# $2 - encrypted test : 0 = plain, 1 - encrypted with server reply risk, 2 - encrypted without server reply risk
# $3 - domain
local s mss s2 s3 pos sec="$2"
if [ "$sec" = 0 ]; then
for s in '--hostcase' '--hostspell=hoSt' '--hostdot' '--hosttab' '--hostnospace' '--domcase' \
'--hostpad=1024' '--hostpad=2048' '--hostpad=4096' '--hostpad=8192' '--hostpad=16384' ; do
tpws_curl_test_update $1 $3 $s && [ "$SCANLEVEL" = quick ] && return
done
for s2 in '' '--oob' '--disorder' '--oob --disorder'; do
for s in '--split-http-req=method' '--split-http-req=method --hostcase' '--split-http-req=host' '--split-http-req=host --hostcase' ; do
tpws_curl_test_update $1 $3 $s $s2 && [ "$SCANLEVEL" = quick ] && return
done
done
for s in '--methodspace' '--unixeol' '--methodeol'; do
tpws_curl_test_update $1 $3 $s && [ "$SCANLEVEL" = quick ] && return
done
else
for mss in '' 88; do
s3=${mss:+--mss=$mss --mss-pf=$HTTPS_PORT}
for s2 in '' '--oob' '--disorder' '--oob --disorder'; do
for pos in 1 2 3 4 5 10 50; do
s="--split-pos=$pos"
tpws_curl_test_update $1 $3 $s $s2 $s3 && warn_mss && [ "$SCANLEVEL" != force ] && {
[ "$SCANLEVEL" = quick ] && return
break
}
done
done
for s2 in '--tlsrec=sni' '--tlsrec=sni --split-pos=10' '--tlsrec=sni --split-pos=10 --oob' \
'--tlsrec=sni --split-pos=10 --disorder' '--tlsrec=sni --split-pos=10 --oob --disorder' \
'--tlsrec=sni --split-pos=1' '--tlsrec=sni --split-pos=1 --oob' '--tlsrec=sni --split-pos=1 --disorder' \
'--tlsrec=sni --split-pos=1 --oob --disorder'; do
tpws_curl_test_update $1 $3 $s2 $s3 && warn_mss && [ "$SCANLEVEL" != force ] && {
[ "$SCANLEVEL" = quick ] && return
break
}
done
# only linux supports mss
[ "$UNAME" = Linux -a "$sec" = 1 ] || break
done
fi
}
tpws_check_domain_http_bypass()
{
# $1 - test function
# $2 - encrypted test : 0 = plain, 1 - encrypted with server reply risk, 2 - encrypted without server reply risk
# $3 - domain
local strategy
tpws_check_domain_http_bypass_ "$@"
report_strategy $1 $3 tpws
}
curl_has_reason_to_continue()
{
# $1 - curl return code
for c in 1 2 3 4 6 27 ; do
[ $1 = $c ] && return 1
done
return 0
}
check_domain_prolog()
{
# $1 - test function
# $2 - port
# $3 - domain
local code
echo
echo \* $1 ipv$IPV $3
echo "- checking without DPI bypass"
curl_test $1 $3 && {
report_append "ipv${IPV} $3 $1 : working without bypass"
[ "$SCANLEVEL" = force ] || return 1
}
code=$?
curl_has_reason_to_continue $code || {
report_append "ipv${IPV} $3 $1 : test aborted, no reason to continue. curl code $(curl_translate_code $code)"
return 1
}
return 0
}
check_domain_http_tcp()
{
# $1 - test function
# $2 - port
# $3 - encrypted test : 0 = plain, 1 - encrypted with server reply risk, 2 - encrypted without server reply risk
# $4 - domain
# in case was interrupted before
pktws_ipt_unprepare_tcp $2
ws_kill
check_domain_prolog $1 $2 $4 || return
[ "$SKIP_TPWS" = 1 ] || {
echo
tpws_check_domain_http_bypass $1 $3 $4
}
[ "$SKIP_PKTWS" = 1 ] || {
echo
echo preparing $PKTWSD redirection
pktws_ipt_prepare_tcp $2
pktws_check_domain_http_bypass $1 $3 $4
echo clearing $PKTWSD redirection
pktws_ipt_unprepare_tcp $2
}
}
check_domain_http_udp()
{
# $1 - test function
# $2 - port
# $3 - domain
# in case was interrupted before
pktws_ipt_unprepare_udp $2
ws_kill
check_domain_prolog $1 $2 $3 || return
[ "$SKIP_PKTWS" = 1 ] || {
echo
echo preparing $PKTWSD redirection
pktws_ipt_prepare_udp $2
pktws_check_domain_http3_bypass $1 $3
echo clearing $PKTWSD redirection
pktws_ipt_unprepare_udp $2
}
}
check_domain_http()
{
# $1 - domain
check_domain_http_tcp curl_test_http 80 0 $1
}
check_domain_https_tls12()
{
# $1 - domain
check_domain_http_tcp curl_test_https_tls12 443 1 $1
}
check_domain_https_tls13()
{
# $1 - domain
check_domain_http_tcp curl_test_https_tls13 443 2 $1
}
check_domain_http3()
{
# $1 - domain
check_domain_http_udp curl_test_http3 443 $1
}
configure_ip_version()
{
if [ "$IPV" = 6 ]; then
LOCALHOST=::1
LOCALHOST_IPT=[${LOCALHOST}]
IPVV=6
else
IPTABLES=iptables
LOCALHOST=127.0.0.1
LOCALHOST_IPT=$LOCALHOST
IPVV=
fi
IPTABLES=ip${IPVV}tables
}
configure_curl_opt()
{
# wolfssl : --tlsv1.x mandates exact ssl version, tls-max not supported
# openssl : --tlsv1.x means "version equal or greater", tls-max supported
TLSMAX12=
TLSMAX13=
curl_supports_tlsmax && {
TLSMAX12="--tls-max 1.2"
TLSMAX13="--tls-max 1.3"
}
TLS13=
curl_supports_tls13 && TLS13=1
HTTP3=
curl_supports_http3 && HTTP3=1
}
linux_ipv6_defrag_can_be_disabled()
{
linux_min_version 4 16
}
configure_defrag()
{
IP6_DEFRAG_DISABLE=
[ "$IPVS" = 4 ] && return
[ "$UNAME" = "Linux" ] && {
linux_ipv6_defrag_can_be_disabled || {
echo "WARNING ! ipv6 defrag can only be effectively disabled in linux kernel 4.16+"
echo "WARNING ! ipv6 ipfrag tests are disabled"
echo
return
}
}
case "$FWTYPE" in
iptables)
if ipt6_has_raw ; then
if ipt6_has_frag; then
IP6_DEFRAG_DISABLE=1
else
echo "WARNING ! ip6tables does not have '-m frag' module, ipv6 ipfrag tests are disabled"
echo
fi
else
echo "WARNING ! ip6tables raw table is not available, ipv6 ipfrag tests are disabled"
echo
fi
[ -n "$IP6_DEFRAG_DISABLE" ] && {
local ipexe="$(readlink -f $(whichq ip6tables))"
if contains "$ipexe" nft; then
echo "WARNING ! ipv6 ipfrag tests may have no effect if ip6tables-nft is used. current ip6tables point to : $ipexe"
else
echo "WARNING ! ipv6 ipfrag tests may have no effect if ip6table_raw kernel module is not loaded with parameter : raw_before_defrag=1"
fi
echo
}
;;
*)
IP6_DEFRAG_DISABLE=1
;;
esac
}
ask_params()
{
echo
echo NOTE ! this test should be run with zapret or any other bypass software disabled, without VPN
echo
curl_supports_connect_to || {
echo "installed curl does not support --connect-to option. pls install at least curl 7.49"
echo "current curl version:"
curl --version
exitp 1
}
echo "specify domain(s) to test. multiple domains are space separated."
printf "domain(s) (default: $DOMAINS) : "
local dom
read dom
[ -n "$dom" ] && DOMAINS="$dom"
printf "ip protocol version(s) - 4, 6 or 46 for both (default: 4) : "
read IPVS
[ -n "$IPVS" ] || IPVS=4
[ "$IPVS" = 4 -o "$IPVS" = 6 -o "$IPVS" = 46 ] || {
echo 'invalid ip version(s). should be 4, 6 or 46.'
exitp 1
}
[ "$IPVS" = 46 ] && IPVS="4 6"
configure_curl_opt
ENABLE_HTTP=1
echo
ask_yes_no_var ENABLE_HTTP "check http"
ENABLE_HTTPS_TLS12=1
echo
ask_yes_no_var ENABLE_HTTPS_TLS12 "check https tls 1.2"
ENABLE_HTTPS_TLS13=0
echo
if [ -n "$TLS13" ]; then
echo "TLS 1.3 is the new standard for encrypted communications over TCP"
echo "its the most important feature for DPI bypass is encrypted TLS ServerHello"
echo "more and more sites enable TLS 1.3 but still there're many sites with only TLS 1.2 support"
echo "with TLS 1.3 more DPI bypass strategies can work but they may not apply to all sites"
echo "if a strategy works with TLS 1.2 it will also work with TLS 1.3"
echo "if nothing works with TLS 1.2 this test may find TLS1.3 only strategies"
echo "make sure that $DOMAINS support TLS 1.3 otherwise all test will return an error"
ask_yes_no_var ENABLE_HTTPS_TLS13 "check https tls 1.3"
else
echo "installed curl version does not support TLS 1.3 . tests disabled."
fi
ENABLE_HTTP3=0
echo
if [ -n "$HTTP3" ]; then
echo "make sure target domain(s) support QUIC or result will be negative in any case"
ENABLE_HTTP3=1
ask_yes_no_var ENABLE_HTTP3 "check http3 QUIC"
else
echo "installed curl version does not support http3 QUIC. tests disabled."
fi
IGNORE_CA=0
CURL_OPT=
[ $ENABLE_HTTPS_TLS13 = 1 -o $ENABLE_HTTPS_TLS12 = 1 ] && {
echo
echo "on limited systems like openwrt CA certificates might not be installed to preserve space"
echo "in such a case curl cannot verify server certificate and you should either install ca-bundle or disable verification"
echo "however disabling verification will break https check if ISP does MitM attack and substitutes server certificate"
ask_yes_no_var IGNORE_CA "do not verify server certificate"
[ "$IGNORE_CA" = 1 ] && CURL_OPT=-k
}
echo
echo "sometimes ISPs use multiple DPIs or load balancing. bypass strategies may work unstable."
printf "how many times to repeat each test (default: 1) : "
read REPEATS
REPEATS=$((0+${REPEATS:-1}))
[ "$REPEATS" = 0 ] && {
echo invalid repeat count
exitp 1
}
echo
echo quick - scan as fast as possible to reveal any working strategy
echo standard - do investigation what works on your DPI
echo force - scan maximum despite of result
SCANLEVEL=${SCANLEVEL:-standard}
ask_list SCANLEVEL "quick standard force" "$SCANLEVEL"
# disable tpws checks by default in quick mode
[ "$SCANLEVEL" = quick -a -z "$SKIP_TPWS" ] && SKIP_TPWS=1
echo
configure_defrag
}
pingtest()
{
case "$UNAME" in
OpenBSD)
ping -c 1 -w 1 $1 >/dev/null
;;
CYGWIN)
# cygwin does not have own PING by default. use windows PING.
ping -n 1 -w 1000 $1 >/dev/null
;;
*)
ping -c 1 -W 1 $1 >/dev/null
;;
esac
}
dnstest()
{
# $1 - dns server. empty for system resolver
"$LOOKUP" w3.org $1 >/dev/null 2>/dev/null
}
find_working_public_dns()
{
local dns
for dns in $DNSCHECK_DNS; do
pingtest $dns && dnstest $dns && {
PUBDNS=$dns
return 0
}
done
return 1
}
lookup4()
{
# $1 - domain
# $2 - DNS
case "$LOOKUP" in
nslookup)
nslookup $1 $2 2>/dev/null | sed -e '1,3d' -nre 's/^[^0-9]*(([0-9]{1,3}\.){3}[0-9]{1,3}).*$/\1/p'
;;
host)
host -t A $1 $2 | grep "has address" | grep -oE '([0-9]{1,3}\.){3}[0-9]{1,3}'
;;
esac
}
check_dns_spoof()
{
# $1 - domain
# $2 - public DNS
# windows version of mdig outputs 0D0A line ending. remove 0D.
echo $1 | "$MDIG" --family=4 | tr -d '\r' >"$DNSCHECK_DIG1"
lookup4 $1 $2 >"$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" "$DNSCHECK_DIGS" 2>/dev/null
}
check_dns()
{
local C1 C2 dom
echo \* checking DNS
[ -f "$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 $dom; done | "$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 "$DNSCHECK_DIGS" | uniq -d
echo -- POSSIBLE DNS HIJACK DETECTED. ZAPRET WILL NOT HELP YOU IN CASE DNS IS SPOOFED !!!
echo -- DNSCRYPT MAY BE REQUIRED
check_dns_cleanup
return 1
}
echo all resolved IPs are unique
echo -- DNS looks good
echo -- NOTE this check is Russia targeted. In your country other domains may be blocked.
check_dns_cleanup
return 0
}
unprepare_all()
{
# make sure we are not in a middle state that impacts connectivity
rm -f "$HDRTEMP"
[ -n "$IPV" ] && {
pktws_ipt_unprepare_tcp 80
pktws_ipt_unprepare_tcp 443
pktws_ipt_unprepare_udp 443
}
ws_kill
cleanup
}
sigint()
{
echo
echo terminating...
unprepare_all
exitp 1
}
sigint_cleanup()
{
cleanup
exit 1
}
sigpipe()
{
# must not write anything here to stdout
unprepare_all
exit 1
}
fsleep_setup
fix_sbin_path
check_system
[ "$UNAME" = CYGWIN ] || require_root
check_prerequisites
trap sigint_cleanup INT
check_dns
check_virt
ask_params
trap - INT
PID=
NREPORT=
unset WF
trap sigint INT
trap sigpipe PIPE
for dom in $DOMAINS; do
for IPV in $IPVS; do
configure_ip_version
[ "$ENABLE_HTTP" = 1 ] && check_domain_http $dom
[ "$ENABLE_HTTPS_TLS12" = 1 ] && check_domain_https_tls12 $dom
[ "$ENABLE_HTTPS_TLS13" = 1 ] && check_domain_https_tls13 $dom
[ "$ENABLE_HTTP3" = 1 ] && check_domain_http3 $dom
done
done
trap - PIPE
trap - INT
cleanup
echo
echo \* SUMMARY
report_print
echo
echo "Please note this SUMMARY does not guarantee a magic pill for you to copy/paste and be happy."
echo "Understanding how strategies work is very desirable."
echo "This knowledge allows to understand better which strategies to prefer and which to avoid if possible, how to combine strategies."
echo "Blockcheck does it's best to prioritize good strategies but it's not bullet-proof."
echo "It was designed not as magic pill maker but as a DPI bypass test tool."
exitp 0
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