From 489229f3da3ba35265a1ce6fe626dce624bb8000 Mon Sep 17 00:00:00 2001
From: Francesco Chemolli <5175948+kinkie@users.noreply.github.com>
Date: Sat, 31 May 2025 18:40:35 +0000
Subject: [PATCH] Disable EUI when arpreq is missing and cannot be defined
 (#2070)

OpenBSD 7.7 provides a net/if_arp.h header file,
but it doesn't provide a `struct arpreq`, which
is necessary for our EUI implementation to work.

Disable EUI when arpreq definition is missing,
except on Windows where we provide our own.
---
 configure.ac | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/configure.ac b/configure.ac
index 163dd9622a..91d933b640 100644
--- a/configure.ac
+++ b/configure.ac
@@ -986,6 +986,21 @@ include <windows.h>
   [], [], [[
 #if HAVE_SYS_PARAM_H
 #include <sys/param.h>
+#endif
+  ]])
+  AC_CHECK_MEMBER([struct arpreq.arp_pa],[],[
+    AS_IF([test "x$squid_host_os" != "xmingw" -a "x$squid_host_os" != "xcygwin"],[
+      AC_MSG_NOTICE([OS support for EUI seems incomplete, disabling it])
+      enable_eui=no
+    ])],[[
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#if HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#if HAVE_NET_IF_ARP_H
+#include <net/if_arp.h>
 #endif
   ]])
   SQUID_STATE_ROLLBACK(LIBEUI)
-- 
2.47.2