netdev - [PATCH] iputils/ping_common.c: avoid gethostbyaddr during ping flood

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Date:	Wed, 6 Feb 2008 13:02:28 +0000 (UTC)
From:	Chris Caputo <ccaputo@....net>
To:	netdev@...r.kernel.org
Subject: [PATCH] iputils/ping_common.c: avoid gethostbyaddr during ping flood

Unless a destination is specified by IP address, a ping flood results in a 
gethostbyaddr() for every echo reply.  Thus a DNS flood can accompany a 
ping flood.

This patch makes it so a gethostbyaddr() is not performed with each echo 
reply during a ping flood.

Signed-off-by: Chris Caputo <ccaputo@....net>
---
 ping_common.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

===================================================================
diff -ur iputils-s20071127/ping_common.c iputils/ping_common.c
--- iputils-s20071127/ping_common.c     2007-11-27 00:57:27.000000000 +0000
+++ iputils/ping_common.c       2008-02-06 12:38:01.000000000 +0000
@@ -114,10 +114,6 @@
        case 'd':
                options |= F_SO_DEBUG;
                break;
-       case 'f':
-               options |= F_FLOOD;
-               setbuf(stdout, (char *)NULL);
-               break;
        case 'i':               /* wait between sending packets */
        {
                if (strchr(optarg, '.')) {
@@ -168,6 +164,10 @@
                        exit(2);
                }
                break;
+       case 'f':
+               options |= F_FLOOD;
+               setbuf(stdout, (char *)NULL);
+               /* fallthrough to numeric - avoid gethostbyaddr during flood */
        case 'n':
                options |= F_NUMERIC;
                break;
--
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