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Re: xinetd.d listening twice on port 69



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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 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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