From 4bd4d2b2927c87b65de915d42ebd7c082ae13ff8 Mon Sep 17 00:00:00 2001
From: Yuri Sevatz <yuri_sevatz@hotmail.com>
Date: Thu, 17 Dec 2020 04:52:58 -0500
Subject: Fix gateway detection when gateway in routing table with all null's

---
 netifaces.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/netifaces.c b/netifaces.c
index bf18c80..ffaf8c8 100644
--- a/netifaces.c
+++ b/netifaces.c
@@ -1894,8 +1894,14 @@ gateways (PyObject *self)
           attr = RTA_NEXT(attr, len);
         }
 
+        static const unsigned char ipv4_default[4] = {};
+        static const unsigned char ipv6_default[16] = {};
+
         /* We're looking for gateways with no destination */
-        if (!dst && gw && ifndx >= 0) {
+        if ((!dst
+            || (pmsg->rt.rtm_family == AF_INET && !memcmp(dst, ipv4_default, sizeof(ipv4_default)))
+            || (pmsg->rt.rtm_family == AF_INET6 && !memcmp(dst, ipv6_default, sizeof(ipv6_default)))
+        ) && gw && ifndx >= 0) {
           char buffer[256];
           char ifnamebuf[IF_NAMESIZE];
           char *ifname;
-- 
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