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Re: xinetd.d listening twice on port 69



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 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.


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