Modify ping so that it increases the send socket buffer size if the

user runs with privilege, allowing the sending of icmp packets with
larger size (up to 48k, the default receive buffer size in ping),
which is useful for network driver development testing, as well
as experimentation with fragmentation.

Reviewed by:	wpaul

sbin/ping/ping.c

@@ -565,6 +565,11 @@ main(argc, argv)
 	(void)setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&hold,
 	    sizeof(hold));
 
+	if (!uid) {
+		(void)setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&hold,
+		    sizeof(hold));
+	}
+
 	if (to->sin_family == AF_INET) {
 		(void)printf("PING %s (%s)", hostname,
 		    inet_ntoa(to->sin_addr));