From 0e35fb2f99ce4c249c0a42ad93a597835ae742b5 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Tue, 4 Feb 2025 14:23:14 -0800
Subject: [PATCH] net: ignore unnamed interfaces on DragonFly

On DragonFly it seems that we can see an unnamed interface,
but be unable to retrieve it. Skip unnamed interface cases.

For #71064

Change-Id: Ie9af74bd656d403ddc19cc5f14062cd8e0fa2571
Reviewed-on: https://go-review.googlesource.com/c/go/+/646675
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Damien Neil <dneil@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Commit-Queue: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
---
 src/internal/routebsd/interface_classic.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/internal/routebsd/interface_classic.go b/src/internal/routebsd/interface_classic.go
index af9531c0df..2599e5dd59 100644
--- a/src/internal/routebsd/interface_classic.go
+++ b/src/internal/routebsd/interface_classic.go
@@ -41,6 +41,12 @@ func (w *wireFormat) parseInterfaceMessage(b []byte) (Message, error) {
 		}
 		m.Addrs[syscall.RTAX_IFP] = a
 		m.Name = a.(*LinkAddr).Name
+	} else {
+		// DragonFly seems to have unnamed interfaces
+		// that we can't look up again. Just skip them.
+		if runtime.GOOS == "dragonfly" {
+			return nil, nil
+		}
 	}
 
 	return m, nil
-- 
2.51.0