sniped from Fedora and made to not suck

http://bugs.gentoo.org/218638

--- iputils-s20070202/Makefile
+++ iputils-s20070202/Makefile
@@ -22,6 +22,11 @@
 
 all: $(TARGETS)
 
+ifeq ($(IDN),yes)
+CPPFLAGS += -DIDN
+ping: LDLIBS += -lidn
+ping6: LDLIBS += -lidn
+endif
 
 tftpd: tftpd.o tftpsubs.o
 ping: ping.o ping_common.o
--- iputils-s20070202/ping.c
+++ iputils-s20070202/ping.c
@@ -58,6 +58,11 @@
  *	This program has to run SUID to ROOT to access the ICMP socket.
  */
 
+#ifdef IDN
+#include <idna.h>
+#include <locale.h>
+#endif
+
 #include "ping_common.h"
 
 #include <netinet/ip.h>
@@ -122,6 +128,12 @@
 	char *target, hnamebuf[MAXHOSTNAMELEN];
 	char rspace[3 + 4 * NROUTES + 1];	/* record route space */
 
+#ifdef IDN
+	char *idn;
+	int rc = 0;
+	setlocale(LC_ALL, "");
+#endif
+
 	icmp_sock = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
 	socket_errno = errno;
 
@@ -242,13 +254,35 @@
 			if (argc == 1)
 				options |= F_NUMERIC;
 		} else {
+#ifdef IDN
+			rc = idna_to_ascii_lz (target, &idn, 0);
+			if (rc == IDNA_SUCCESS)
+				hp = gethostbyname (idn);
+			else {
+				fprintf(stderr, "ping: IDN encoding of '%s' failed with error code %d\n", target, rc);
+				exit(2);
+			}
+			free(idn);
+#else
 			hp = gethostbyname(target);
+#endif
 			if (!hp) {
 				fprintf(stderr, "ping: unknown host %s\n", target);
 				exit(2);
 			}
 			memcpy(&whereto.sin_addr, hp->h_addr, 4);
+#ifdef IDN
+			rc = idna_to_unicode_lzlz (hp->h_name, &idn, 0);
+			if (rc == IDNA_SUCCESS)
+				strncpy(hnamebuf, idn, sizeof(hnamebuf) - 1);
+			else {
+				fprintf(stderr, "ping: IDN encoding of '%s' failed with error code %d\n", hp->h_name, rc);
+				exit(2);
+			}
+			free(idn);
+#else
 			strncpy(hnamebuf, hp->h_name, sizeof(hnamebuf) - 1);
+#endif
 			hnamebuf[sizeof(hnamebuf) - 1] = 0;
 			hostname = hnamebuf;
 		}
--- iputils-s20070202/ping6.c
+++ iputils-s20070202/ping6.c
@@ -66,6 +66,13 @@
  *	More statistics could always be gathered.
  *	This program has to run SUID to ROOT to access the ICMP socket.
  */
+#ifdef IDN
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#include <locale.h>
+#endif
+
 #include "ping_common.h"
 
 #include <linux/filter.h>
@@ -210,6 +216,10 @@
 	int err, csum_offset, sz_opt;
 	static uint32_t scope_id = 0;
 
+#ifdef IDN
+	setlocale(LC_ALL, "");
+#endif
+
 	icmp_sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
 	socket_errno = errno;
 
@@ -296,6 +306,9 @@
 
 		memset(&hints, 0, sizeof(hints));
 		hints.ai_family = AF_INET6;
+#ifdef IDN
+		hints.ai_flags = AI_IDN;
+#endif
 		gai = getaddrinfo(target, NULL, &hints, &ai);
 		if (gai) {
 			fprintf(stderr, "unknown host\n");
@@ -328,6 +341,9 @@
 
 	memset(&hints, 0, sizeof(hints));
 	hints.ai_family = AF_INET6;
+#ifdef IDN
+	hints.ai_flags = AI_IDN;
+#endif
 	gai = getaddrinfo(target, NULL, &hints, &ai);
 	if (gai) {
 		fprintf(stderr, "unknown host\n");
--- iputils-s20070202/ping_common.c
+++ iputils-s20070202/ping_common.c
@@ -1,3 +1,7 @@
+#ifdef IDN
+#include <locale.h>
+#endif
+
 #include "ping_common.h"
 #include <ctype.h>
 #include <sched.h>
@@ -97,6 +102,9 @@
 
 void common_options(int ch)
 {
+#ifdef IDN
+	setlocale(LC_ALL, "C");
+#endif
 	switch(ch) {
 	case 'a':
 		options |= F_AUDIBLE;
@@ -222,6 +230,9 @@
 	default:
 		abort();
 	}
+#ifdef IDN
+	setlocale(LC_ALL, "");
+#endif
 }