commit d3557114c74a96710e0612fb1aed77513835ee90
Author: Christine Caulfield <ccaulfie@redhat.com>
Date:   Thu Jun 4 16:55:39 2009 +0100

    fence: Allow IP addresses as node names
    
    When checking if a node is a member of the cluster, fenced does a full-string
    check of the name. If that doesn't match it then assumes that one of the
    names is a FQDN and one is truncated so it starts checking the bit before the
    first dot.
    
    If the node names are IP addresses then this will match all of the time for
    most clusters. eg: 192.168.2.1 will match 192.168.2.2 because it just
    matches the 192. This makes fenced think that the node has rejoined the cluster
    because it sees the name in the list of active nodes, and won't fence it.
    
    This patch abandons the match check afer the full-string one if the node
    name is found to be an IP address.
    
    bz#504158
    
    Signed-off-by: Christine Caulfield <ccaulfie@redhat.com>

diff --git a/fence/fenced/member_cman.c b/fence/fenced/member_cman.c
index 3994283..9e22ece 100644
--- a/fence/fenced/member_cman.c
+++ b/fence/fenced/member_cman.c
@@ -1,7 +1,7 @@
 /******************************************************************************
 *******************************************************************************
 **
-**  Copyright (C) 2005 Red Hat, Inc.  All rights reserved.
+**  Copyright (C) 2005-2009 Red Hat, Inc.  All rights reserved.
 **
 **  This copyrighted material is made available to anyone wishing to use,
 **  modify, copy, or redistribute it subject to the terms and conditions
@@ -11,6 +11,7 @@
 ******************************************************************************/
 
 #include <libcman.h>
+#include <arpa/inet.h>
 #include "fd.h"
 
 #define BUFLEN		128
@@ -30,6 +31,7 @@ int			our_nodeid;
 static int name_equal(char *name1, char *name2)
 {
 	char name3[BUFLEN], name4[BUFLEN];
+	char addr1[INET6_ADDRSTRLEN];
 	int i, len1, len2;
 
 	len1 = strlen(name1);
@@ -38,6 +40,16 @@ static int name_equal(char *name1, char *name2)
 	if (len1 == len2 && !strncmp(name1, name2, len1))
 		return TRUE;
 
+	/*
+	 * If the names are IP addresses then don't compare
+	 * what is in front of the dots.
+	 */
+	if (inet_pton(AF_INET, name1, addr1) == 0)
+		return FALSE;
+
+	if (inet_pton(AF_INET6, name1, addr1) == 0)
+		return FALSE;
+
 	memset(name3, 0, BUFLEN);
 	memset(name4, 0, BUFLEN);