From 714e2b458c151c5bdfe93647445cd00dd8e36fff Mon Sep 17 00:00:00 2001
From: Petr Vorel <petr.vorel@gmail.com>
Date: Sat, 21 Jul 2018 17:46:14 +0200
Subject: [PATCH] ping: Fix AI_CANONIDN usage on some systems

Upstream-Status: Backport
Signed-off-by: Ross Burton <ross.burton@intel.com>

Commit 99f67db used AI_CANONIDN in a way, which broke compilation on
systems where AI_CANONIDN is not defined in netdb.h (e.g. glibc < 2.3.4,
alternative libcs that don't support IDN: e.g. current musl 1.1.19 and
uClibc-ng 1.0.30) when not using the system libidn2.

Fixes: 99f67db ping: Fix ping name encoded using ACE on C locale

Reported-by: Nicholas Fish
Signed-off-by: Petr Vorel <petr.vorel@gmail.com>

---
 ping.c | 2 +-
 ping.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/ping.c b/ping.c
index 733477f..b241815 100644
--- a/ping.c
+++ b/ping.c
@@ -207,9 +207,9 @@ main(int argc, char **argv)
 
 #ifdef USE_IDN
 	setlocale(LC_ALL, "");
-#endif
 	if (!strcmp(setlocale(LC_ALL, NULL), "C"))
 		hints.ai_flags &= ~ AI_CANONIDN;
+#endif
 
 	/* Support being called using `ping4` or `ping6` symlinks */
 	if (argv[0][strlen(argv[0])-1] == '4')
diff --git a/ping.h b/ping.h
index 3e09685..8a0c4ef 100644
--- a/ping.h
+++ b/ping.h
@@ -28,7 +28,6 @@
 #include <netinet/icmp6.h>
 #include <linux/filter.h>
 #include <resolv.h>
-#include <locale.h>
 
 #ifdef CAPABILITIES
 #include <sys/prctl.h>
@@ -36,6 +35,7 @@
 #endif
 
 #ifdef USE_IDN
+#include <locale.h>
 #include <idn2.h>
 #define getaddrinfo_flags (AI_CANONNAME | AI_IDN | AI_CANONIDN)
 #define getnameinfo_flags NI_IDN