xinetd.d listening twice on port 69

[Mark Sargent]

Andy Green wrote:

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> Radek Vokál wrote:
> | On Tue, 2005-04-05 at 07:20 +0100, Andy Green wrote:
> |
> |
> |>| udp        0      0 0.0.0.0:69                  0.0.0.0:*
> |>| 4995/xinetd
> |>| udp        0      0 0.0.0.0:69                  0.0.0.0:*
> |>| 4995/xinetd
> |>
> |>Lol... well, I learnt something today already.
> |>
> |
> |
> | This might be a bug in netstat. I was fixing an issue recently that 
> some
> | entries appeard twice in tcp section. I didn't thought that this can
> | happen also with udp stuff. Will try to investigate it ..
>
> Hi Radek -
>
> I would find it a nice explanation if it is a bug, because my
> understanding of how the  sockets work will not allow this scenario of a
> single process binding two sockets to the same port and listen()-ing to
> both.  Of course my understanding can easily be broken and often is ;-)
>
> Here's an idea for Mark, run lsof -n | grep xinetd and see if you can
> see two IPv4 sockets open in there or one.  It's another way to look at
> the question of how many sockets are open and by whom.  Here's what I
> get with tftp up in xinetd
>
> [root at server root]# lsof -n | grep xinetd
> xinetd     3674    root  cwd       DIR      253,0       4096          2 /
> xinetd     3674    root  rtd       DIR      253,0       4096          2 /
> xinetd     3674    root  txt       REG      253,0     152348    7218038
> /usr/sbin/xinetd
> xinetd     3674    root  mem       REG      253,0      47496    4587569
> /lib/libnss_files-2.3.4.so
> xinetd     3674    root  mem       REG      253,0      97736    4587567
> /lib/libnsl-2.3.4.so
> xinetd     3674    root  mem       REG      253,0     108332    4587529
> /lib/ld-2.3.4.so
> xinetd     3674    root  mem       REG      253,0     215272    4587573
> /lib/tls/libm-2.3.4.so
> xinetd     3674    root  mem       REG      253,0      28632    4587552
> /lib/libcrypt-2.3.4.so
> xinetd     3674    root  mem       REG      253,0      28504    7217911
> /usr/lib/libwrap.so.0.7.6
> xinetd     3674    root  mem       REG      253,0    1524828    4587533
> /lib/tls/libc-2.3.4.so
> xinetd     3674    root    0r      CHR        1,3                  1806
> /dev/null
> xinetd     3674    root    1r      CHR        1,3                  1806
> /dev/null
> xinetd     3674    root    2r      CHR        1,3                  1806
> /dev/null
> xinetd     3674    root    3r     FIFO        0,5                  
> 7715 pipe
> xinetd     3674    root    4w     FIFO        0,5                  
> 7715 pipe
> xinetd     3674    root    5u     IPv4       7837                   UDP
> *:tftp
> xinetd     3674    root    7u     unix 0xef733dc0                  7719
> socket
>
> - -Andy
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Hi All,

ok, will do this at work tomorrow, as the machne is there. Cheers.

Mark Sargent.