[iputils][ping] ip address resolution bug

[iputils][ping] ip address resolution bug

[Quentin RAMEAU]

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Ping does not ensure it is resolving a hostname to an IPv4 address.
i.e. when setting 'options inet6' in resolv.conf, gethostbyname(3)
returns an IPv6 address, but ping handles it as in IPv4 address.
I attached a simple patch which replaces gethostbyname() with
gethostbyname2(), I'm not sure that is the best way to do it, feel
free to comment.

Quentin Rameau

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diff --git a/ping.c b/ping.c
index c0366cd..4989760 100644
--- a/ping.c
+++ b/ping.c
@@ -279,7 +279,7 @@ main(int argc, char **argv)
 #else
 			idn = target;
 #endif
-			hp = gethostbyname(idn);
+			hp = gethostbyname2(idn, AF_INET);
 			if (!hp) {
 				fprintf(stderr, "ping: unknown host %s\n", target);
 				exit(2);