Writing FCC hangs under HP-UX 10.20

Writing FCC hangs under HP-UX 10.20

Post by Dave Grube » Thu, 22 Jan 1998 04:00:00



Greetings,

Latetly when using Pine 3.95 under HP-UX 10.20, when writing
fcc appears, pine will hang.  Is this a known problem, or is
there a fix available?

Any help would be greatly appreciated!

Thanks!
-Dave

--
Dave Gruber                             |

Altair Computing Inc.                   | http://www.altair.com
1757 Maplelawn Dr., Troy, MI  48084     |

 
 
 

Writing FCC hangs under HP-UX 10.20

Post by Chris Gr » Thu, 22 Jan 1998 04:00:00



Quote: writes:
> Latetly when using Pine 3.95 under HP-UX 10.20, when writing
> fcc appears, pine will hang.  Is this a known problem, or is
> there a fix available?

Probably Pine is configured in such a way that it starts up sendmail
every time you hit "send"; this can take some time.  It's generally
better to let Pine just write to the outgoing spool, and let sendmail
run periodically to send stuff out.

Then again, it could be something else entirely. :)

--

  Chris Gray

 
 
 

1. Hung sendmail-8.9.1 processes on HP-UX 10.20

I was testing out the access_db feature with sendmail-8.9.1 which I
compiled under HP-UX 10.20 and I have noticed a problem.

I'm using /etc/mail/access.db, with the source containing the following
for testing purposes:




I telneted to port 25 after running makemap and this is what my session
looked like after the EHLO command:



rset
250 Reset state

At this point, the connection 'hangs'. From the client side, I can kill
the connection, but on the machine running the sendmail daemon, the
sendmail process continues to run. It's been running for almost 24 hours
now.

I can send it a SIGUSR1 with kill, resulting in the following syslog
entries:

Jul 15 15:06:46 xyz0 sendmail[12528]: NOQUEUE: --- dumping state on user
signal: $j = xyz0.cc.uic.edu ---
Jul 15 15:06:46 xyz0 sendmail[12528]: NOQUEUE: CurChildren = 0
Jul 15 15:06:46 xyz0 sendmail[12528]: NOQUEUE: --- open file
descriptors: ---
Jul 15 15:06:46 xyz0 sendmail[12528]: NOQUEUE:   0: fl=0x0, mode=20666:
CHR: size=0
Jul 15 15:06:46 xyz0 sendmail[12528]: NOQUEUE:   1: CANNOT STAT (Invalid
argument)
Jul 15 15:06:46 xyz0 sendmail[12528]: NOQUEUE:   2: fl=0x1, mode=20666:
CHR: size=0
Jul 15 15:06:46 xyz0 sendmail[12528]: NOQUEUE:   3: fl=0x10001,
mode=10666: FIFO: size=4096
Jul 15 15:06:46 xyz0 sendmail[12528]: NOQUEUE:   4: CANNOT STAT (Invalid
argument)
Jul 15 15:06:46 xyz0 sendmail[12528]: NOQUEUE:   5: CANNOT STAT (Invalid
argument)
Jul 15 15:06:46 xyz0 sendmail[12528]: NOQUEUE:   7: fl=0x0, mode=100600:
size=40960
Jul 15 15:06:46 xyz0 sendmail[12528]: NOQUEUE:   8: fl=0x0, mode=100644:
size=40960
Jul 15 15:06:46 xyz0 sendmail[12528]: NOQUEUE: --- connection cache: ---
Jul 15 15:06:46 xyz0 sendmail[12528]: NOQUEUE: --- end of state dump ---

NB: I've set Timeout.command=20m using confTO_COMMAND in my m4 source.

I just tried a similar SMTP conversation with a valid MAIL FROM: ....
command (i.e. passes access_db checks) and it seems the RSET followed by
a new and valid MAIL FROM: ... also hangs.

Has anyone seen this? Seems like an easy way to create a DOS attack. I
have yet to try this on another OS.

Thanks,
Vinod Kutty.

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