Re: [Openslp-users] slpd seems to hijack the port I'm using in my application
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Re: [Openslp-users] slpd seems to hijack the port I'm using in my application
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From: Nick W. <ne...@wi...> - 2012-10-17 15:24:56
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What does your slpd.log show?
On Wed, Oct 17, 2012 at 5:50 AM, Robert Hegner <rh...@hs...> wrote:
> Ok I managed to setup the latest SVN revision of OpenSLP now. I had to
> modify the start script a little bit, like this:
>
> start-stop-daemon --pidfile /var/run/$NAME.pid \
> --exec $DAEMON --start -- -p /var/run/$NAME.pid
>
> Now the bad news is that I'm experiencing exactly the same port
> hijacking behaviour as before :(
>
>
>
> Am 16.10.2012 08:59, schrieb Robert Hegner:
> > Yes it happens with any port.
> >
> > I want to try it with version 2.0 but I have some problems getting it to
> > work (I'm new to the Linux world...). I managed to build it but I
> > couldn't start/stop slpd properly. I'll have a look at this again today.
> >
> > You might have noticed in the lsof -i listings in my original post that
> > the PID of slpd changes. The reason is that my application restarts slpd
> > under certain conditions to make sure its service is published on all
> > available network interfaces. The application starts and stops slpd by
> > calling (as root):
> > int ret = system("/bin/sh -e /etc/init.d/slpd stop");
> > int ret = system("/bin/sh -e /etc/init.d/slpd start");
> >
> > Do you think this could cause the problem? Is this the proper way to
> > programmatically restart slpd under Linux (Debian)? Under Windows I use
> > the scmanager API and it works like a charm (with version 2.0, I've
> > never tested it with version 1.x under Windows). I'll try and check how
> > version 2.0 behaves in this scenario later today.
> >
> > Gavin Lambert posted a patch in the developers newsgroup to make slpd
> > re-initialize its interfaces by sending it a signal. It would be great
> > if some mechanism like this made it into the release version of OpenSLP
> > 2.0. In my scenario I would not have to restart spld anymore.
> >
> > PS: It would make things much easier if version 2.0 came as a prebuilt
> > Debian package, so I'm glad to hear that it will soon reach release
> > status. Do you think it will make it into Debian Wheezy (which I think
> > will soon change from testing to stable)?
> >
> > Thanks,
> > Robert
> >
> >
> > Am 15.10.2012 16:51, schrieb Nick Wagner:
> >> If you try some other port, does SLP hijack that too? We're nearing
> >> release on version 2.0, would you like to try that and see if if you
> >> have a similar problem? I don't believe we're doing anything in the
> >> current code that would cause that side effect, and 1.2.1 was a long
> >> time ago.
> >>
> >> --Nick
> >>
> >> On Fri, Oct 12, 2012 at 3:35 AM, Robert Hegner
> >> <rh...@hs... <mailto:rh...@hs...>> wrote:
> >>
> >> I recently ported my application from Windows to Linux and now I'm
> >> experiencing some strange problem when running it under Debian
> >> together with OpenSLP 1.2.1-9 (this is the version that comes out
> of
> >> the box with Debian).
> >>
> >> The problem is that slpd seems to occupy the port I'm using for my
> >> application. Let me explain...
> >>
> >> Before I start my application, "lsof -i" lists the following spld
> >> related entries:
> >>
> >> COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
> >> slpd 2786 daemon 4u IPv4 6415 0t0 TCP
> >> localhost:svrloc (LISTEN)
> >> slpd 2786 daemon 5u IPv4 6416 0t0 TCP
> >> DebianWheezy.local:svrloc (LISTEN)
> >> slpd 2786 daemon 6u IPv4 6417 0t0 UDP
> >> 239.255.255.253:svrloc
> >> slpd 2786 daemon 7u IPv4 6418 0t0 UDP
> >> DebianWheezy.local:svrloc
> >> slpd 2786 daemon 8u IPv4 6419 0t0 TCP
> >> 3724G-21104-2.hsr.ch:svrloc (LISTEN)
> >> slpd 2786 daemon 9u IPv4 6420 0t0 UDP
> >> 239.255.255.253:svrloc
> >> slpd 2786 daemon 10u IPv4 6421 0t0 UDP
> >> 3724G-21104-2.hsr.ch:svrloc
> >>
> >> Then I start my application which registers the following two
> >> services with SLP:
> >> service:TrackingNode.ADEC:CP://
> 10.0.2.15:1234/1c736ed2-e8b7-545c-998a-2ce095e600ea
> >> <http://10.0.2.15:1234/1c736ed2-e8b7-545c-998a-2ce095e600ea>
> >> service:TrackingNode.ADEC:CP://
> 192.168.0.24:1234/1c736ed2-e8b7-545c-998a-2ce095e600ea
> >> <http://192.168.0.24:1234/1c736ed2-e8b7-545c-998a-2ce095e600ea>
> >>
> >> Of course my application opens a socket to listen to port 1234. Now
> >> comes the part that surprised me: slpd also begins to listen to
> port
> >> 1234 (why??). "lsof -i" shows this:
> >>
> >> COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
> >> *TrackingN 4795 root 6u IPv4 12170 0t0 TCP *:1234
> >> (LISTEN)*
> >> TrackingN 4795 root 7u IPv4 12186 0t0 TCP
> >> localhost:45272->localhost:svrloc (ESTABLISHED)
> >> slpd 4805 daemon 0u IPv4 12189 0t0 TCP
> >> localhost:svrloc->localhost:45272 (ESTABLISHED)
> >> slpd 4805 daemon 1u IPv4 12204 0t0 UDP *:37734
> >> slpd 4805 daemon 2u IPv4 12199 0t0 UDP *:49554
> >> slpd 4805 daemon 4u IPv4 12176 0t0 TCP
> >> localhost:svrloc (LISTEN)
> >> slpd 4805 daemon 5u IPv4 12177 0t0 TCP
> >> DebianWheezy.local:svrloc (LISTEN)
> >> *slpd 4805 daemon 6u IPv4 12170 0t0 TCP *:1234
> >> (LISTEN)*
> >> slpd 4805 daemon 7u IPv4 12178 0t0 UDP
> >> 239.255.255.253:svrloc
> >> slpd 4805 daemon 8u IPv4 12179 0t0 UDP
> >> DebianWheezy.local:svrloc
> >> slpd 4805 daemon 9u IPv4 12180 0t0 TCP
> >> 3724G-21104-2.hsr.ch:svrloc (LISTEN)
> >> slpd 4805 daemon 10u IPv4 12181 0t0 UDP
> >> 239.255.255.253:svrloc
> >> slpd 4805 daemon 11u IPv4 12182 0t0 UDP
> >> 3724G-21104-2.hsr.ch:svrloc
> >>
> >> And then, when I quit my application, slpd keeps listening on port
> 1234:
> >>
> >> COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
> >> slpd 4816 daemon 4u IPv4 12317 0t0 TCP
> >> localhost:svrloc (LISTEN)
> >> slpd 4816 daemon 5u IPv4 12318 0t0 TCP
> >> DebianWheezy.local:svrloc (LISTEN)
> >> *slpd 4816 daemon 6u IPv4 12170 0t0 TCP *:1234
> >> (LISTEN)*
> >> slpd 4816 daemon 7u IPv4 12319 0t0 UDP
> >> 239.255.255.253:svrloc
> >> slpd 4816 daemon 8u IPv4 12320 0t0 UDP
> >> DebianWheezy.local:svrloc
> >> slpd 4816 daemon 9u IPv4 12321 0t0 TCP
> >> 3724G-21104-2.hsr.ch:svrloc (LISTEN)
> >> slpd 4816 daemon 10u IPv4 12322 0t0 UDP
> >> 239.255.255.253:svrloc
> >> slpd 4816 daemon 11u IPv4 12323 0t0 UDP
> >> 3724G-21104-2.hsr.ch:svrloc
> >> slpd 4816 daemon 13u IPv4 12326 0t0 UDP *:47496
> >>
> >> Now when I restart my application and it tries to open a socket to
> >> listen to port 1234 again, I get an "Address already in use" error,
> >> since slpd still occupies that port.
> >>
> >> Can anyone explain what's happening here? Why does slpd hijack my
> port?
> >>
> >>
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> >>
> >>
> >>
> >>
> >>
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> >>
> >>
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> >>
> >
> >
> >
> >
> ------------------------------------------------------------------------------
> > Don't let slow site performance ruin your business. Deploy New Relic APM
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> >
>
>
>
>
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