From 9bd68008df9e761cbf8014362ed07c9188e37878 Mon Sep 17 00:00:00 2001
From: dmiller <dmiller@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Thu, 28 Aug 2025 19:28:41 +0000
Subject: [PATCH] Ensure we don't use --send-eth for localhost

---
 scan_engine.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/scan_engine.cc b/scan_engine.cc
index 3f96e51d7..2087202cb 100644
--- a/scan_engine.cc
+++ b/scan_engine.cc
@@ -956,6 +956,13 @@ void UltraScanInfo::Init(std::vector<Target *> &Targets, const struct scan_lists
       assert(!(sendpref & PACKET_SEND_IP_STRONG));
       sendpref = PACKET_SEND_ETH;
     }
+#ifndef WIN32
+    /* Windows does loopback via Npcap (eth),
+     * but we want to avoid that for everyone else. */
+    if (Targets[0]->ifType() == devt_loopback) {
+      sendpref = PACKET_SEND_IP;
+    }
+#endif
     if (!raw_socket_or_eth(sendpref, Targets[0]->deviceName(), &rawsd, &ethsd)) {
       fatal("Couldn't open a raw socket or eth handle.");
     }