From 664bc601751b655e31c0ebd204f1337499e41dd5 Mon Sep 17 00:00:00 2001
From: bol-van <none@none.none>
Date: Tue, 23 Dec 2025 23:01:36 +0300
Subject: [PATCH] winws2: send to interface 1.0 if no ifname given

---
 nfq2/darkmagic.c | 17 ++++++++++++-----
 nfq2/desync.c    |  3 ++-
 nfq2/nfqws.c     |  2 +-
 3 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/nfq2/darkmagic.c b/nfq2/darkmagic.c
index 07e7172..abbfe8a 100644
--- a/nfq2/darkmagic.c
+++ b/nfq2/darkmagic.c
@@ -1304,14 +1304,21 @@ bool rawsend(const struct sockaddr* dst,uint32_t fwmark,const char *ifout,const
 {
 	WINDIVERT_ADDRESS wa;
 
-	if (!ifout) return false;
-
 	memset(&wa,0,sizeof(wa));
 	// pseudo interface id IfIdx.SubIfIdx
-	if (sscanf(ifout,"%u.%u",&wa.Network.IfIdx,&wa.Network.SubIfIdx)!=2)
+	if (ifout && *ifout)
 	{
-		errno = EINVAL;
-		return false;
+		if (sscanf(ifout,"%u.%u",&wa.Network.IfIdx,&wa.Network.SubIfIdx)!=2)
+		{
+			errno = EINVAL;
+			return false;
+		}
+	}
+	else
+	{
+		// 1 - typically loopback
+		wa.Network.IfIdx=1;
+		wa.Network.SubIfIdx=0;
 	}
 	wa.Outbound=1;
 	wa.IPChecksum=1;
diff --git a/nfq2/desync.c b/nfq2/desync.c
index 68ad7eb..6ecd101 100644
--- a/nfq2/desync.c
+++ b/nfq2/desync.c
@@ -308,7 +308,7 @@ static bool auto_hostlist_retrans
 				tcp->th_win = ctrack->pos.server.winsize;
 				tcp_fix_checksum(tcp, sizeof(struct tcphdr), ip, ip6);
 
-				DLOG("sending RST to retransmitter\n");
+				DLOG("sending RST to retransmitter. ifname=%s\n", ifclient ? ifclient : "");
 				rawsend(client,0,ifclient,pkt,pktlen);
 			}
 			return true;
@@ -1271,6 +1271,7 @@ static uint8_t dpi_desync_tcp_packet_play(
 		}
 
 		process_retrans_fail(ctrack, dis, (struct sockaddr*)&src, ifin);
+
 		if (IsHttp(rdata_payload, rlen_payload))
 		{
 			DLOG("packet contains HTTP request\n");
diff --git a/nfq2/nfqws.c b/nfq2/nfqws.c
index 3c4637f..c75fcd5 100644
--- a/nfq2/nfqws.c
+++ b/nfq2/nfqws.c
@@ -538,7 +538,7 @@ static int dvt_main(void)
 
 					DLOG("\npacket: id=%u len=%zu ifin=%s ifout=%s\n", id, len, ifin, ifout);
 					modlen = sizeof(buf);
-					verdict = processPacketData(&mark, NULL, NULL, buf, len, buf, &modlen);
+					verdict = processPacketData(&mark, ifin, ifout, buf, len, buf, &modlen);
 					switch (verdict & VERDICT_MASK)
 					{
 					case VERDICT_PASS: