mirror of
https://github.com/bol-van/zapret.git
synced 2024-12-23 23:04:23 +00:00
505 lines
11 KiB
Bash
Executable File
505 lines
11 KiB
Bash
Executable File
#!/bin/sh
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EXEDIR="$(dirname "$0")"
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EXEDIR="$(cd "$EXEDIR"; pwd)"
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ZAPRET_BASE="$EXEDIR"
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[ -n "$QNUM" ] || QNUM=59780
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[ -n "$NFQWS" ] || NFQWS="$ZAPRET_BASE/nfq/nfqws"
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[ -n "$MDIG" ] || MDIG="$ZAPRET_BASE/mdig/mdig"
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[ -n "$DESYNC_MARK" ] || DESYNC_MARK=0x40000000
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DOMAIN=rutracker.org
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CURL_MAX_TIME=5
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MIN_TTL=1
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MAX_TTL=12
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HDRTEMP=/tmp/zapret-hdr.txt
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ECHON="echo -n"
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DNSCHECK_DNS="8.8.8.8 1.1.1.1 77.88.8.8"
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DNSCHECK_DOM="pornhub.com putinhuylo.com rutracker.org nnmclub.to protonmail.com"
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DNSCHECK_DIG1=/tmp/dig1.txt
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DNSCHECK_DIG2=/tmp/dig2.txt
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DNSCHECK_DIGS=/tmp/digs.txt
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exists()
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{
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which $1 >/dev/null 2>/dev/null
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}
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killwait()
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{
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# $1 - signal (-9, -2, ...)
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# $2 - pid
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kill $1 $2
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# suppress job kill message
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wait $2 2>/dev/null
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}
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exitp()
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{
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local A
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echo
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echo press enter to continue
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read A
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exit $1
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}
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read_yes_no()
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{
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# $1 - default (Y/N)
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local A
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read A
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[ -z "$A" ] || ([ "$A" != "Y" ] && [ "$A" != "y" ] && [ "$A" != "N" ] && [ "$A" != "n" ]) && A=$1
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[ "$A" = "Y" ] || [ "$A" = "y" ] || [ "$A" = "1" ]
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}
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ask_yes_no()
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{
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# $1 - default (Y/N or 0/1)
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# $2 - text
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local DEFAULT=$1
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[ "$1" = "1" ] && DEFAULT=Y
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[ "$1" = "0" ] && DEFAULT=N
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[ -z "$DEFAULT" ] && DEFAULT=N
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$ECHON "$2 (default : $DEFAULT) (Y/N) ? "
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read_yes_no $DEFAULT
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}
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ask_yes_no_var()
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{
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# $1 - variable name for answer : 0/1
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# $2 - text
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local DEFAULT
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eval DEFAULT="\$$1"
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if ask_yes_no "$DEFAULT" "$2"; then
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eval $1=1
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else
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eval $1=0
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fi
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}
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require_root()
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{
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echo \* checking privileges
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[ $(id -u) -ne "0" ] && {
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echo root is required
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exists sudo && exec sudo "$0"
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exists su && exec su -c "$0"
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echo su or sudo not found
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exitp 2
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}
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}
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IPT()
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{
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$IPTABLES -C "$@" >/dev/null 2>/dev/null || $IPTABLES -I "$@"
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}
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IPT_DEL()
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{
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$IPTABLES -C "$@" >/dev/null 2>/dev/null && $IPTABLES -D "$@"
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}
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check_system()
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{
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echo \* checking system
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local UNAME=$(uname)
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[ "$UNAME" = "Linux" ] || {
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echo not supported
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exitp 5
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}
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}
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check_prerequisites()
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{
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echo \* checking prerequisites
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[ -x "$NFQWS" ] && [ -x "$MDIG" ] || {
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echo $NFQWS or $MDIG is not available. run $ZAPRET_BASE/install_bin.sh
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exitp 6
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}
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for prog in iptables ip6tables curl; do
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exists $prog || {
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echo $prog does not exist. please install
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exitp 6
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}
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done
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}
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hdrfile_http_code()
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{
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# $1 - hdr file
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sed -nre '1,1 s/^HTTP\/1\.[0,1] ([0-9]+) .*$/\1/p' "$1"
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}
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hdrfile_location()
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{
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# $1 - hdr file
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# some DPIs return CRLF line ending
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tr -d '\015' <"$1" | sed -nre 's/^[Ll][Oo][Cc][Aa][Tt][Ii][Oo][Nn]:[ \t]*([^ \t]*)[ \t]*$/\1/p'
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}
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curl_test_http()
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{
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# $1 - ip version : 4/6
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# $2 - domain name
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local code loc
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curl -${1}SsD "$HDRTEMP" --max-time $CURL_MAX_TIME $CURL_OPT "http://$2" -o /dev/null 2>&1 || {
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code=$?
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rm -f "$HDRTEMP"
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return $code
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}
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code=$(hdrfile_http_code "$HDRTEMP")
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[ "$code" = 301 -o "$code" = 302 -o "$code" = 307 -o "$code" = 308 ] && {
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loc=$(hdrfile_location "$HDRTEMP")
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echo "$loc" | grep -qE "^https?://.*$2(/|$)" ||
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echo "$loc" | grep -vqE '^https?://' || {
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echo suspicious redirection to : $loc
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rm -f "$HDRTEMP"
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return 254
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}
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}
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rm -f "$HDRTEMP"
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return 0
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}
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curl_test_https()
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{
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# $1 - ip version : 4/6
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# $2 - domain name
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# prevent using QUIC if available in curl
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curl -${1}Ss --max-time $CURL_MAX_TIME $CURL_OPT --http1.1 "https://$2" -o /dev/null 2>&1
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}
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nfqws_ipt_prepare()
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{
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# $1 - port
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IPT POSTROUTING -t mangle -p tcp --dport $1 -m mark ! --mark $DESYNC_MARK/$DESYNC_MARK -j NFQUEUE --queue-num $QNUM
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}
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nfqws_ipt_unprepare()
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{
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# $1 - port
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IPT_DEL POSTROUTING -t mangle -p tcp --dport $1 -m mark ! --mark $DESYNC_MARK/$DESYNC_MARK -j NFQUEUE --queue-num $QNUM
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}
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nfqws_start()
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{
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"$NFQWS" --dpi-desync-fwmark=$DESYNC_MARK --qnum=$QNUM "$@" >/dev/null &
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}
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curl_test()
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{
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# $1 - test function
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# $2 - domain
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$1 $IPV $2 && {
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echo '!!!!! AVAILABLE !!!!!'
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return 0
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}
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local code=$?
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if [ $code = 254 ]; then
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echo UNAVAILABLE
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else
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echo UNAVAILABLE code=$code
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fi
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return $code
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}
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nfqws_curl_test()
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{
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# $1 - test function
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# $2 - domain
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# $3,$4,$5, ... - nfqws params
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local code pid testf=$1 dom=$2
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shift
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shift
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echo - checking nfqws "$@"
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nfqws_start "$@"
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pid=$!
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curl_test $testf $dom
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code=$?
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killwait -9 $pid
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return $code
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}
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check_domain_bypass()
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{
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# $1 - test function
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# $2 - encrypted test : 1/0
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# $3 - domain
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local pid strategy tests='fake' ttls s sec="$2" found
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[ "$sec" = 0 ] && {
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s="--hostcase"
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nfqws_curl_test $1 $3 $s && strategy="${strategy:-$s}"
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s="--hostnospace"
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nfqws_curl_test $1 $3 $s && strategy="${strategy:-$s}"
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s="--domcase"
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nfqws_curl_test $1 $3 $s && strategy="${strategy:-$s}"
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}
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s="--dpi-desync=split2"
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if nfqws_curl_test $1 $3 $s; then
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strategy="${strategy:-$s}"
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else
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tests="$tests split fake,split"
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[ "$sec" = 0 ] && {
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s="$s --hostcase"
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nfqws_curl_test $1 $3 $s && strategy="${strategy:-$s}"
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}
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fi
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s="--dpi-desync=disorder2"
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if nfqws_curl_test $1 $3 $s; then
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strategy="${strategy:-$s}"
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else
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tests="$tests disorder fake,disorder"
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fi
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ttls=$(seq -s ' ' $MIN_TTL $MAX_TTL)
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for desync in $tests; do
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found=0
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for ttl in $ttls; do
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s="--dpi-desync=$desync --dpi-desync-ttl=$ttl"
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nfqws_curl_test $1 $3 $s && {
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found=1
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strategy="${strategy:-$s}"
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break
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}
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done
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[ "$sec" = 1 ] && [ "$found" = 0 ] && {
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for ttl in $ttls; do
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s="--dpi-desync=$desync --dpi-desync-ttl=$ttl --wssize 1:6"
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nfqws_curl_test $1 $3 $s && {
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found=1
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strategy="${strategy:-$s}"
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break
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}
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done
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}
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s="--dpi-desync=$desync --dpi-desync-fooling=badsum"
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nfqws_curl_test $1 $3 $s && strategy="${strategy:-$s}"
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s="--dpi-desync=$desync --dpi-desync-fooling=md5sig"
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nfqws_curl_test $1 $3 $s && {
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strategy="${strategy:-$s}"
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echo WARNING ! although md5sig fooling worked it will not work on all sites. it typically works only on linux servers.
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}
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s="--dpi-desync=$desync --dpi-desync-fooling=badseq"
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nfqws_curl_test $1 $3 $s && strategy="${strategy:-$s}"
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done
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echo
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if [ -n "$strategy" ]; then
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echo "!!!!! working strategy found : nfqws $strategy !!!!!"
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return 0
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else
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echo 'working strategy not found'
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return 1
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fi
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}
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check_domain()
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{
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# $1 - test function
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# $2 - port
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# $3 - encrypted test : 1/0
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# $4 - domain
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local code
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echo
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echo \* $1 $4
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# in case was interrupted before
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nfqws_ipt_unprepare $2
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killall nfqws 2>/dev/null
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echo "- checking without DPI bypass"
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curl_test $1 $4 && return
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code=$?
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for c in 1 2 3 4 6 27 ; do
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[ $code = $c ] && return
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done
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echo preparing nfqws redirection
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nfqws_ipt_prepare $2
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check_domain_bypass $1 $3 $4
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echo clearing nfqws redirection
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nfqws_ipt_unprepare $2
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}
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check_domain_http()
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{
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# $1 - domain
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check_domain curl_test_http 80 0 $1
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}
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check_domain_https()
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{
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# $1 - domain
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check_domain curl_test_https 443 1 $1
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}
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ask_params()
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{
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echo
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echo NOTE ! this test should be run with zapret or any other bypass software disabled, without VPN
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echo NOTE ! this test will kill all nfqws processes. if you have already set up zapret you will need to restart it after test is complete.
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$ECHON "test this domain (default: $DOMAIN) : "
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local dom
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read dom
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[ -n "$dom" ] && DOMAIN=$dom
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$ECHON "ip protocol version - 4 or 6 (default: 4) : "
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read IPV
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[ -n "$IPV" ] || IPV=4
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[ "$IPV" = 4 -o "$IPV" = 6 ] || {
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echo invalid ip version. should be 4 or 6.
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exitp 1
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}
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IPTABLES=iptables
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[ "$IPV" = 6 ] && IPTABLES=ip6tables
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ENABLE_HTTP=1
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ask_yes_no_var ENABLE_HTTP "check http"
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ENABLE_HTTPS=1
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ask_yes_no_var ENABLE_HTTPS "check https"
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IGNORE_CA=0
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CURL_OPT=
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[ "$ENABLE_HTTPS" = "1" ] && {
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echo on limited systems like openwrt CA certificates might not be installed to preserve space
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echo in such a case curl cannot verify server certificate and you should either install ca-bundle or disable verification
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echo however disabling verification will break https check if ISP does MitM attack and substitutes server certificate
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ask_yes_no_var IGNORE_CA "do not verify server certificate"
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[ "$IGNORE_CA" = 1 ] && CURL_OPT=-k
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}
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}
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pingtest()
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{
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ping -c 1 -W 1 $1 >/dev/null
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}
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dnstest()
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{
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# $1 - dns server. empty for system resolver
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nslookup w3.org $1 >/dev/null 2>/dev/null
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}
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find_working_public_dns()
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{
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for dns in $DNSCHECK_DNS; do
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pingtest $dns && dnstest $dns && {
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PUBDNS=$dns
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return 0
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}
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done
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return 1
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}
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check_dns_spoof()
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{
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# $1 - domain
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# $2 - public DNS
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echo $1 | "$EXEDIR/mdig/mdig" --family=4 >"$DNSCHECK_DIG1"
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nslookup $1 $2 | sed -n '/Name:/,$p' | grep ^Address | grep -oE '([0-9]{1,3}\.){3}[0-9]{1,3}' >"$DNSCHECK_DIG2"
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# check whether system resolver returns anything other than public DNS
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grep -qvFf "$DNSCHECK_DIG2" "$DNSCHECK_DIG1"
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}
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check_dns_cleanup()
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{
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rm -f "$DNSCHECK_DIG1" "$DNSCHECK_DIG2" "$DNSCHECK_DIGS" 2>/dev/null
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}
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check_dns()
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{
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local C1 C2
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echo \* checking DNS
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[ -f "$DNSCHECK_DIGS" ] && rm -f "$DNSCHECK_DIGS"
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dnstest || {
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echo -- DNS is not working. It's either misconfigured or blocked or you don't have inet access.
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return 1
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}
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echo system DNS is working
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if find_working_public_dns ; then
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echo comparing system resolver to public DNS : $PUBDNS
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for dom in $DNSCHECK_DOM; do
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if check_dns_spoof $dom $PUBDNS ; then
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echo $dom : MISMATCH
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echo -- system resolver :
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cat "$DNSCHECK_DIG1"
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echo -- $PUBDNS :
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cat "$DNSCHECK_DIG2"
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check_dns_cleanup
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echo -- POSSIBLE DNS HIJACK DETECTED. ZAPRET WILL NOT HELP YOU IN CASE DNS IS SPOOFED !!!
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echo -- DNS CHANGE OR DNSCRYPT MAY BE REQUIRED
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return 1
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else
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echo $dom : OK
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cat "$DNSCHECK_DIG1" >>"$DNSCHECK_DIGS"
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fi
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done
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else
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echo no working public DNS was found. looks like public DNS blocked.
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for dom in $DNSCHECK_DOM; do echo $dom; done | "$EXEDIR/mdig/mdig" --threads=10 --family=4 >"$DNSCHECK_DIGS"
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fi
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echo checking resolved IP uniqueness for : $DNSCHECK_DOM
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echo censor\'s DNS can return equal result for multiple blocked domains.
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C1=$(wc -l <"$DNSCHECK_DIGS")
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C2=$(sort -u "$DNSCHECK_DIGS" | wc -l)
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[ "$C1" -eq 0 ] &&
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{
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echo -- DNS is not working. It's either misconfigured or blocked or you don't have inet access.
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check_dns_cleanup
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return 1
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}
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[ "$C1" = "$C2" ] ||
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{
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echo system dns resolver has returned equal IPs for some domains checked above \($C1 total, $C2 unique\)
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echo non-unique IPs :
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sort "$DNSCHECK_DIGS" | uniq -d
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echo -- POSSIBLE DNS HIJACK DETECTED. ZAPRET WILL NOT HELP YOU IN CASE DNS IS SPOOFED !!!
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echo -- DNSCRYPT MAY BE REQUIRED
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check_dns_cleanup
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return 1
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}
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echo all resolved IPs are unique
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echo -- DNS looks good
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echo -- NOTE this check is Russia targeted. In your country other domains may be blocked.
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check_dns_cleanup
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return 0
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}
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sigint()
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{
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# make sure we are not in a middle state that impacts connectivity
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echo
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echo terminating...
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nfqws_ipt_unprepare 80
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nfqws_ipt_unprepare 443
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killall nfqws 2>/dev/null
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exitp 1
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}
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trap 'sigint' 2
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check_system
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check_prerequisites
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require_root
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check_dns
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ask_params
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[ "$ENABLE_HTTP" = 1 ] && check_domain_http $DOMAIN
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[ "$ENABLE_HTTPS" = 1 ] && check_domain_https $DOMAIN
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exitp 0
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