From 455fe96e7dcadd433973b1709ee79cdb58ffe428 Mon Sep 17 00:00:00 2001
From: Jan Wagner <waja@cyconet.org>
Date: Fri, 24 Jan 2014 18:33:37 +0100
Subject: check_ping: Fixing "time of day goes back" by Geoff Oakham <goakham
 at oanda.com>

Patch of check_ping that allows it to gracefully handle when ping outputs
to stderr "Warning: time of day goes back (-XXXXus), taking countermeasures."

Closes: #809 and #1195

diff --git a/THANKS.in b/THANKS.in
index c5e6057..a77ecd4 100644
--- a/THANKS.in
+++ b/THANKS.in
@@ -301,4 +301,5 @@ Pall Sigurdsson
 Sebastian Schmidt
 Simon Kainz
 Steve Weinreich
+Geoff Oakham
 Tim Laszlo
diff --git a/plugins/check_ping.c b/plugins/check_ping.c
index c0bb32f..95ac7b4 100644
--- a/plugins/check_ping.c
+++ b/plugins/check_ping.c
@@ -482,7 +482,11 @@ run_ping (const char *cmd, const char *addr)
 	/* check stderr, setting at least WARNING if there is output here */
 	/* Add warning into warn_text */
 	while (fgets (buf, MAX_INPUT_BUFFER - 1, child_stderr)) {
-		if (! strstr(buf,"WARNING - no SO_TIMESTAMP support, falling back to SIOCGSTAMP")) {
+		if (
+			! strstr(buf,"WARNING - no SO_TIMESTAMP support, falling back to SIOCGSTAMP")
+			&& ! strstr(buf,"Warning: time of day goes back")
+
+		) {
 			if (verbose >= 3) {
 				printf("Got stderr: %s", buf);
 			}
-- 
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