Date: Fri, 07 Jan 2011 21:01:01 -0500 From: Boris Kochergin <spawk@acm.poly.edu> To: Sergey Kandaurov <pluknet@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: NDP Ethernet address display Message-ID: <4D27C55D.8070200@acm.poly.edu> In-Reply-To: <AANLkTinhoqTsjrgYqZZVFJ610L7eHqfjU-vzPVqcHXpt@mail.gmail.com> References: <4D27AF1D.2030505@acm.poly.edu> <AANLkTinhoqTsjrgYqZZVFJ610L7eHqfjU-vzPVqcHXpt@mail.gmail.com>
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On 01/07/11 20:26, Sergey Kandaurov wrote:
> On 8 January 2011 03:26, Boris Kochergin<spawk@acm.poly.edu> wrote:
>> Hi. I noticed that ndp(8) doesn't zero-pad Ethernet addresses, which is
>> inconsistent with arp(8):
>>
>> # ndp -an
>> ...
>> 2001:470:897b::1 0:30:48:b1:1b:9c em0 permanent R
>>
>> # arp -an
>> ...
>> ? (128.238.9.201) at 00:30:48:b1:1b:9c on em0 permanent [ethernet]
>>
>> As everything else I can think of zero-pads them, this makes it a little
>> annoying to grep for addresses, etc. Is this intentional? It is the case in
>> 7.x through CURRENT and the fix is quite simple:
>>
>> --- /usr/src/usr.sbin/ndp/ndp.c.orig 2011-01-07 19:16:17.000000000 -0500
>> +++ /usr/src/usr.sbin/ndp/ndp.c 2011-01-07 19:15:36.000000000 -0500
>> @@ -828,7 +828,7 @@
>>
>> if (sdl->sdl_alen) {
>> cp = (u_char *)LLADDR(sdl);
>> - snprintf(hbuf, sizeof(hbuf), "%x:%x:%x:%x:%x:%x",
>> + snprintf(hbuf, sizeof(hbuf),
>> "%02x:%02x:%02x:%02x:%02x:%02x",
>> cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]);
>> } else
>> snprintf(hbuf, sizeof(hbuf), "(incomplete)");
>>
> Or rather use getnameinfo() for that as NetBSD/KAME does, and
> NetBSD's getnameinfo() AF_LINK support was merged at 6.3 time.
>
> (See ndp.c#rev1.87 at KAME, ndp.c#rev1.35 at NetBSD).
>
Sure.
-Boris
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name="ndp.patch"
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filename="ndp.patch"
--- /usr/src/usr.sbin/ndp/ndp.c.orig 2011-01-07 19:16:17.000000000 -0500
+++ /usr/src/usr.sbin/ndp/ndp.c 2011-01-07 21:00:20.000000000 -0500
@@ -80,6 +80,7 @@
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/time.h>
+#include <sys/types.h>
#include <sys/queue.h>
#include <net/if.h>
@@ -824,12 +825,12 @@
struct sockaddr_dl *sdl;
{
static char hbuf[NI_MAXHOST];
- u_char *cp;
if (sdl->sdl_alen) {
- cp = (u_char *)LLADDR(sdl);
- snprintf(hbuf, sizeof(hbuf), "%x:%x:%x:%x:%x:%x",
- cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]);
+ if (getnameinfo((struct sockaddr *)(void *)sdl,
+ (socklen_t)sdl->sdl_len,
+ hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
+ snprintf(hbuf, sizeof(hbuf), "<invalid>");
} else
snprintf(hbuf, sizeof(hbuf), "(incomplete)");
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