zapret-lib,zapret-antidpi: delay parameter in 'send' desync function

lua/zapret-antidpi.lua

@@ -86,6 +86,7 @@ end
 
 -- nfqws1 : "--dup"
 -- standard args : direction, fooling, ip_id, ipfrag, rawsend, reconstruct
+-- arg : delay=<msec> - drop and send delayed
 function send(ctx, desync)
 	direction_cutoff_opposite(ctx, desync, "any")
 	if direction_check(desync, "any") then
@@ -93,10 +94,20 @@ function send(ctx, desync)
 		local dis = deepcopy(desync.dis)
 		apply_fooling(desync, dis)
 		apply_ip_id(desync, dis, nil, "none")
-		-- it uses rawsend, reconstruct and ipfrag options
-		rawsend_dissect_ipfrag(dis, desync_opts(desync))
+		if desync.arg.delay then
+			local tname = "send_"..desync_timer_name(desync)
+			timer_set(tname, "send_timer_delayed", tonumber(desync.arg.delay), true, {dis = desync.dis, opts = desync_opts(desync)})
+			return VERDICT_DROP
+		else
+			-- it uses rawsend, reconstruct and ipfrag options
+			rawsend_dissect_ipfrag(dis, desync_opts(desync))
+		end
 	end
 end
+function send_timer_delayed(name, data)
+	-- oneshot timer, auto deletes
+	rawsend_dissect_ipfrag(data.dis, data.opts)
+end
 
 -- nfqws1 : "--orig"
 -- apply modification to current packet

lua/zapret-lib.lua

@@ -761,6 +761,63 @@ function fix_ip6_next(ip6, last_proto)
 	end
 end
 
+function dis_ipsrc(dis)
+	if dis.ip then
+		return dis.ip.ip_src
+	elseif dis.ip6 then
+		return dis.ip6.ip6_src
+	end
+end
+function dis_ipdst(dis)
+	if dis.ip then
+		return dis.ip.ip_dst
+	elseif dis.ip6 then
+		return dis.ip6.ip6_dst
+	end
+end
+
+function dis_l4_name(dis)
+	local l4
+	if dis.tcp then
+		l4="tcp"
+	elseif dis.udp then
+		l4="udp"
+	elseif dis.icmp then
+		l4="icmp"
+	else
+		l4="raw"..ip_proto_l3(dis)
+	end
+	return l4
+end
+function dis_l4_ports(dis)
+	local p1,p2
+	if dis.tcp then
+		p1=dis.tcp.th_sport
+		p2=dis.tcp.th_dport
+	elseif dis.udp then
+		p1=dis.udp.uh_sport
+		p2=dis.udp.uh_dport
+	elseif dis.icmp then
+		p1=dis.icmp.icmp_type
+		p2=dis.icmp.icmp_code
+	end
+	return p1 and (p1..":"..p2) or "?"
+end
+
+function dis_timer_name(dis)
+	return table.concat({ntop(dis_ipsrc(dis)),"->",ntop(dis_ipdst(dis)),"_",dis_l4_name(dis),"_",dis_l4_ports(dis)})
+end
+function desync_timer_name(desync)
+	local name = dis_timer_name(desync.dis)
+	if desync.track then
+		name = name.."_n"..desync.track.pos.direct.pcounter
+	else
+		name = name.."_"..brandom_az09(10)
+	end
+	return name
+end
+
+
 -- reverses ip addresses, ports and seq/ack
 function dis_reverse(dis)
 	if dis.ip then
@@ -1690,6 +1747,7 @@ function writefile(filename, data)
 	end
 end
 
+
 -- DISSECTORS
 
 function http_dissect_header(header)