From b586c66baf4824d175d051b3f5b06588c9aa2bc8 Mon Sep 17 00:00:00 2001
From: Alan Somers <asomers@FreeBSD.org>
Date: Fri, 1 Jan 2021 10:25:49 -0700
Subject: [PATCH] ping: fix ping when the kernel was built without INET6

If the kernel was built without INET6, default to ICMP.  Or, if it was
built without INET, default to ICMPv6.

PR:		251725
Reported by:	jbeich
Reviewed by:	jbeich
Tested by:	jbeich
MFC with:	368045
---
 sbin/ping/main.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/sbin/ping/main.c b/sbin/ping/main.c
index 5d28a2b4a5cd..01442679efff 100644
--- a/sbin/ping/main.c
+++ b/sbin/ping/main.c
@@ -126,15 +126,21 @@ main(int argc, char *argv[])
 	else if (ipv4)
 		hints.ai_family = AF_INET;
 	else {
-		struct addrinfo *res;
+		if (!feature_present("inet6"))
+			hints.ai_family = AF_INET;
+		else if (!feature_present("inet"))
+			hints.ai_family = AF_INET6;
+		else {
+			struct addrinfo *res;
 
-		memset(&hints, 0, sizeof(hints));
-		hints.ai_socktype = SOCK_RAW;
-		hints.ai_family = AF_UNSPEC;
-		getaddrinfo(argv[argc - 1], NULL, &hints, &res);
-		if (res != NULL) {
-			hints.ai_family = res[0].ai_family;
-			freeaddrinfo(res);
+			memset(&hints, 0, sizeof(hints));
+			hints.ai_socktype = SOCK_RAW;
+			hints.ai_family = AF_UNSPEC;
+			getaddrinfo(argv[argc - 1], NULL, &hints, &res);
+			if (res != NULL) {
+				hints.ai_family = res[0].ai_family;
+				freeaddrinfo(res);
+			}
 		}
 	}
 #elif defined(INET)