#1:

From b5c5091d0214dd2c6cc504c02e2f78907abdee00 Mon Sep 17 00:00:00 2001
From: Gert Doering <gert@greenie.muc.de>
Date: Fri, 29 May 2020 12:40:17 +0200
Subject: [PATCH] Handle BSD specific error case (EHOSTDOWN) in ping_sendto()

Others:

https://github.com/tfheen/liboping/commit/a88c51f38dafa1fba9118045176754bec05d3c94.patch

Index: src/liboping.c
--- src/liboping.c.orig
+++ src/liboping.c
@@ -668,6 +668,11 @@ static ssize_t ping_sendto (pingobj_t *obj, pinghost_t
 		if (errno == ENETUNREACH)
 			return (0);
 #endif
+		/* BSDs return EHOSTDOWN on ARP/ND failure */
+#if defined(EHOSTDOWN)
+		if (errno == EHOSTDOWN)
+			return (0);
+#endif
 		ping_set_errno (obj, errno);
 	}
 
@@ -1344,43 +1349,12 @@ int ping_send (pingobj_t *obj)
 	struct timeval nowtime;
 	struct timeval timeout;
 
-	_Bool need_ipv4_socket = 0;
-	_Bool need_ipv6_socket = 0;
-
 	for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
 	{
 		ptr->latency  = -1.0;
 		ptr->recv_ttl = -1;
-
-		if (ptr->addrfamily == AF_INET)
-			need_ipv4_socket = 1;
-		else if (ptr->addrfamily == AF_INET6)
-			need_ipv6_socket = 1;
 	}
 
-	if (!need_ipv4_socket && !need_ipv6_socket)
-	{
-		ping_set_error (obj, "ping_send", "No hosts to ping");
-		return (-1);
-	}
-
-	if (need_ipv4_socket && obj->fd4 == -1)
-	{
-		obj->fd4 = ping_open_socket(obj, AF_INET);
-		if (obj->fd4 == -1)
-			return (-1);
-		ping_set_ttl (obj, obj->ttl);
-		ping_set_qos (obj, obj->qos);
-	}
-	if (need_ipv6_socket && obj->fd6 == -1)
-	{
-		obj->fd6 = ping_open_socket(obj, AF_INET6);
-		if (obj->fd6 == -1)
-			return (-1);
-		ping_set_ttl (obj, obj->ttl);
-		ping_set_qos (obj, obj->qos);
-	}
-
 	if (gettimeofday (&nowtime, NULL) == -1)
 	{
 		ping_set_errno (obj, errno);
@@ -1699,6 +1673,23 @@ int ping_host_add (pingobj_t *obj, const char *host)
 
 	ph->table_next = obj->table[ph->ident % PING_TABLE_LEN];
 	obj->table[ph->ident % PING_TABLE_LEN] = ph;
+
+	if (ph->addrfamily == AF_INET && obj->fd4 == -1)
+	{
+		obj->fd4 = ping_open_socket(obj, AF_INET);
+		if (obj->fd4 == -1)
+			return (-1);
+		ping_set_ttl (obj, obj->ttl);
+		ping_set_qos (obj, obj->qos);
+	}
+	if (ph->addrfamily == AF_INET6 && obj->fd6 == -1)
+	{
+		obj->fd6 = ping_open_socket(obj, AF_INET6);
+		if (obj->fd6 == -1)
+			return (-1);
+		ping_set_ttl (obj, obj->ttl);
+		ping_set_qos (obj, obj->qos);
+	}
 
 	return (0);
 } /* int ping_host_add */