custom.d: Add Stun4ALL script (50-script.sh)

zapret/custom.d/50-script.sh

@@ -0,0 +1,31 @@
+# Stun4ALL (discord audio, discord video, telegram call, etc)
+# this custom script runs desync to all stun packets
+# NOTE: @ih requires nft 1.0.1+ and updated kernel version. it's confirmed to work on 5.15 (openwrt 23) and not work on 5.10 (openwrt 22)
+
+# can override in config :
+NFQWS_OPT_DESYNC_STUN="${NFQWS_OPT_DESYNC_STUN:---dpi-desync=fake --dpi-desync-repeats=2}"
+
+alloc_dnum DNUM_STUN4ALL
+alloc_qnum QNUM_STUN4ALL
+
+zapret_custom_daemons()
+{
+	# $1 - 1 - add, 0 - stop
+
+	local opt="--qnum=$QNUM_STUN4ALL $NFQWS_OPT_DESYNC_STUN"
+	do_nfqws $1 $DNUM_STUN4ALL "$opt"
+}
+zapret_custom_firewall()
+{
+        # $1 - 1 - run, 0 - stop
+
+	local f='-p udp -m u32 --u32'
+	fw_nfqws_post $1 "$f 0>>22&0x3C@4>>16=28:65535&&0>>22&0x3C@12=0x2112A442&&0>>22&0x3C@8&0xC0000003=0" "$f 44>>16=28:65535&&52=0x2112A442&&48&0xC0000003=0" $QNUM_STUN4ALL
+}
+zapret_custom_firewall_nft()
+{
+        # stop logic is not required
+
+	local f="udp length >= 28 @ih,32,32 0x2112A442 @ih,0,2 0 @ih,30,2 0"
+	nft_fw_nfqws_post "$f" "$f" $QNUM_STUN4ALL
+}