From d3b918437ab91f7ad9c12f9157c6a19f973a64c4 Mon Sep 17 00:00:00 2001
From: octo <octo>
Date: Fri, 20 Jan 2006 09:46:10 +0000
Subject: [PATCH] Changed the ping-module so it doesn't give up on
 socket-errors.

---
 ChangeLog      |  3 +++
 src/collectd.c |  5 -----
 src/ping.c     | 62 +++++++++++++++++++++++++++++++++++-----------------------
 3 files changed, 41 insertions(+), 29 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index ea681cfe..838d16f6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,9 @@
 	  plugins.
 	* A `df' plugin has been added.
 	* A `mysql' plugin has been added.
+	* The `plugin' module doesn't entirely give up hope when a socket
+	  error occured, but will back of and increase the intervals between
+	  tries.
 
 2005-12-18, Version 3.5.1
 	* The PID-file is now deleted correctly when shutting down the daemon.
diff --git a/src/collectd.c b/src/collectd.c
index 38ff1567..c2c6dc0e 100644
--- a/src/collectd.c
+++ b/src/collectd.c
@@ -37,11 +37,6 @@ static int loop = 0;
 kstat_ctl_t *kc;
 #endif /* HAVE_LIBKSTAT */
 
-#if COLLECT_PING
-char *pinghosts[MAX_PINGHOSTS];
-int   num_pinghosts = 0;
-#endif
-
 /*
  * exported variables
  */
diff --git a/src/ping.c b/src/ping.c
index bdb8de96..661aa65f 100644
--- a/src/ping.c
+++ b/src/ping.c
@@ -32,9 +32,11 @@
 
 #define MAX_PINGHOSTS 32
 
-extern char *pinghosts[MAX_PINGHOSTS];
-extern int   num_pinghosts;
-static int   pingerrors[MAX_PINGHOSTS];
+static char *hosts[MAX_PINGHOSTS];
+static int   hosts_flags[MAX_PINGHOSTS];
+static int   hosts_disable[MAX_PINGHOSTS];
+static int   hosts_backoff[MAX_PINGHOSTS];
+static int   num_pinghosts;
 
 static char *file_template = "ping-%s.rrd";
 
@@ -56,8 +58,12 @@ static void ping_init (void)
 {
 	int i;
 
-	for (i = 0; i < num_pinghosts; i++)
-		pingerrors[i] = 0;
+	for (i = 0; i < MAX_PINGHOSTS; i++)
+	{
+		hosts_flags[i] = 0;
+		hosts_disable[i] = 0;
+		hosts_backoff[i] = 1;
+	}
 
 	return;
 }
@@ -72,13 +78,13 @@ static int ping_config (char *key, char *value)
 	{
 		return (1);
 	}
-	else if ((pinghosts[num_pinghosts] = strdup (value)) == NULL)
+	else if ((hosts[num_pinghosts] = strdup (value)) == NULL)
 	{
 		return (2);
 	}
 	else
 	{
-		pingerrors[num_pinghosts] = 0;
+		hosts_flags[num_pinghosts] = 0;
 		num_pinghosts++;
 		return (0);
 	}
@@ -117,41 +123,49 @@ static void ping_read (void)
 
 	for (i = 0; i < num_pinghosts; i++)
 	{
-		if (pingerrors[i] & 0x30)
+		if (hosts_disable[i] > 0)
+		{
+			hosts_disable[i]--;
 			continue;
+		}
 		
-		ping = tpinghost (pinghosts[i]);
+		ping = tpinghost (hosts[i]);
 
 		switch (ping)
 		{
 			case 0:
-				if (!(pingerrors[i] & 0x01))
-					syslog (LOG_WARNING, "ping %s: Connection timed out.", pinghosts[i]);
-				pingerrors[i] |= 0x01;
+				if (!(hosts_flags[i] & 0x01))
+					syslog (LOG_WARNING, "ping %s: Connection timed out.", hosts[i]);
+				hosts_flags[i] |= 0x01;
 				break;
 
 			case -1:
-				if (!(pingerrors[i] & 0x02))
-					syslog (LOG_WARNING, "ping %s: Host or service is not reachable.", pinghosts[i]);
-				pingerrors[i] |= 0x02;
+				if (!(hosts_flags[i] & 0x02))
+					syslog (LOG_WARNING, "ping %s: Host or service is not reachable.", hosts[i]);
+				hosts_flags[i] |= 0x02;
 				break;
 
 			case -2:
-				syslog (LOG_ERR, "ping %s: Socket error. Ping will be disabled.", pinghosts[i]);
-				pingerrors[i] |= 0x10;
+				syslog (LOG_ERR, "ping %s: Socket error. Ping will be disabled for %i iteration(s).",
+						hosts[i], hosts_backoff[i]);
+				hosts_disable[i] = hosts_backoff[i];
+				if (hosts_backoff[i] < 8192) /* 22 3/4 hours */
+					hosts_backoff[i] *= 2;
+				hosts_flags[i] |= 0x10;
 				break;
 
 			case -3:
-				if (!(pingerrors[i] & 0x04))
-					syslog (LOG_WARNING, "ping %s: Connection refused.", pinghosts[i]);
-				pingerrors[i] |= 0x04;
+				if (!(hosts_flags[i] & 0x04))
+					syslog (LOG_WARNING, "ping %s: Connection refused.", hosts[i]);
+				hosts_flags[i] |= 0x04;
 				break;
 
 			default:
-				if (pingerrors[i] != 0x00)
-					syslog (LOG_NOTICE, "ping %s: Back to normal: %ims.", pinghosts[i], ping);
-				pingerrors[i] = 0x00;
-				ping_submit (ping, pinghosts[i]);
+				if (hosts_flags[i] != 0x00)
+					syslog (LOG_NOTICE, "ping %s: Back to normal: %ims.", hosts[i], ping);
+				hosts_flags[i] = 0x00;
+				hosts_backoff[i] = 1;
+				ping_submit (ping, hosts[i]);
 		} /* switch (ping) */
 	} /* for (i = 0; i < num_pinghosts; i++) */
 }
-- 
2.11.0