[Dovecot] [sfs at tc.umn.edu: Re: dovecot-auth file descriptor usage]

[Steven F Siirila]

I hate to be a pest, but are there any revelations on file descriptor
"overusage" by dovecot-auth?

----- Forwarded message from Steven F Siirila <sfs at tc.umn.edu> -----

Date: Sat, 20 Jan 2007 12:42:50 -0600
From: Steven F Siirila <sfs at tc.umn.edu>
To: Dovecot Mailing List <dovecot at dovecot.org>
User-Agent: Mutt/1.4.2.1i
Subject: Re: [Dovecot] dovecot-auth file descriptor usage

Okay, here is one which has closed fds 0 and 1, so I presume it is
proxying SSL:

11988:  imap-login
  Current rlimit: unlimited file descriptors
   2: S_IFIFO mode:0000 dev:295,0 ino:2692866 uid:0 gid:1 size:0
      O_RDWR
   4: S_IFCHR mode:0644 dev:287,0 ino:99614726 uid:0 gid:3 rdev:190,1
      O_RDONLY|O_LARGEFILE FD_CLOEXEC
      /devices/pseudo/random at 0:urandom
   5: S_IFIFO mode:0000 dev:295,0 ino:2692868 uid:65 gid:65 size:0
      O_RDWR FD_CLOEXEC
   6: S_IFIFO mode:0000 dev:295,0 ino:2692868 uid:65 gid:65 size:0
      O_RDWR FD_CLOEXEC
   7: S_IFSOCK mode:0666 dev:293,0 ino:33376 uid:0 gid:0 size:0
      O_RDWR|O_NONBLOCK
        SOCK_STREAM
        SO_REUSEADDR,SO_KEEPALIVE,SO_SNDBUF(49152),SO_RCVBUF(49640),IP_NEXTHOP(0.0.193.232)
        sockname: AF_INET 134.84.119.102  port: 143
        peername: AF_INET 160.94.23.17  port: 38847
   8: S_IFSOCK mode:0666 dev:293,0 ino:63591 uid:0 gid:0 size:0
      O_RDWR|O_NONBLOCK
        SOCK_STREAM
        SO_SNDBUF(16384),SO_RCVBUF(5120)
        sockname: AF_UNIX
        peername: AF_UNIX default
   9: S_IFSOCK mode:0666 dev:293,0 ino:43728 uid:0 gid:0 size:0
      O_RDWR|O_NONBLOCK
        SOCK_STREAM
        SO_SNDBUF(16384),SO_RCVBUF(5120)
        sockname: AF_UNIX


On Fri, Jan 19, 2007 at 11:34:44PM +0200, Timo Sirainen wrote:
> On Wed, 2007-01-17 at 12:57 -0600, Steven F Siirila wrote:
> > Doh!  Here's another one (took 3 more trials to nab one):
> > 
> > 29058:	imap-login
> >   Current rlimit: unlimited file descriptors
> >    0: S_IFSOCK mode:0666 dev:293,0 ino:63436 uid:0 gid:0 size:0
> >       O_RDWR|O_NONBLOCK
> > 	SOCK_STREAM
> > 	SO_REUSEADDR,SO_KEEPALIVE,SO_SNDBUF(49152),SO_RCVBUF(49152),IP_NEXTHOP(0.0.192.0)
> > 	sockname: AF_INET 0.0.0.0  port: 143
> >    1: S_IFSOCK mode:0666 dev:293,0 ino:42189 uid:0 gid:0 size:0
> >       O_RDWR|O_NONBLOCK
> > 	SOCK_STREAM
> > 	SO_REUSEADDR,SO_KEEPALIVE,SO_SNDBUF(49152),SO_RCVBUF(49152),IP_NEXTHOP(0.0.192.0)
> > 	sockname: AF_INET 0.0.0.0  port: 993
> 
> Almost, but not quite :) File descriptors 0 and 1 are open only when the
> process is listening for new connections (for ports 143 and 993). So
> this process wasn't proxying SSL.
> 
> >    2: S_IFIFO mode:0000 dev:295,0 ino:2456463 uid:0 gid:1 size:0
> >       O_RDWR
> 
> This is logging pipe.
> 
> >    3: S_IFSOCK mode:0666 dev:293,0 ino:37418 uid:0 gid:0 size:0
> >       O_RDWR
> > 	SOCK_STREAM
> > 	SO_SNDBUF(16384),SO_RCVBUF(5120)
> > 	sockname: AF_UNIX 
> 
> Connection to master process.
> 
> >    4: S_IFCHR mode:0644 dev:287,0 ino:99614726 uid:0 gid:3 rdev:190,1
> >       O_RDONLY|O_LARGEFILE FD_CLOEXEC
> >       /devices/pseudo/random at 0:urandom
> 
> /dev/urandom.
> 
> So it hasn't actually yet even connected to dovecot-auth.



-- 

Steven F. Siirila			Office: Lind Hall, Room 130B
Internet Services			E-mail: sfs at umn.edu
Office of Information Technology	Voice: (612) 626-0244
University of Minnesota			Fax: (612) 626-7593

----- End forwarded message -----

-- 

Steven F. Siirila			Office: Lind Hall, Room 130B
Internet Services			E-mail: sfs at umn.edu
Office of Information Technology	Voice: (612) 626-0244
University of Minnesota			Fax: (612) 626-7593