11 Jun
2018
11 Jun
'18
12:26 a.m.
here's a quick hack. Run this detached from a privileged account, and
telnet to port 1234 will cause an immediate halt.
I actually did not run this from a system account; tested that I did get
a %SYSTEM-F-NOPRIV from a regular account.
Possibilities are endless; you might want to listen to private IPs only :)
EXE is at QCOCAL::REMOTE-SHUTDOWN-LISTENER.ZIP or
https://www.dropbox.com/s/kg1vs8zsf2jqn48/remote-shutdown-listener.zip?dl=0
:)
On 6/10/2018 18:20, Supratim Sanyal wrote:
On 6/10/2018 16:00, Mark J. Blair wrote:
> I'm not sure if the HECnet list is the best place to ask this, but hopefully
it's not too far off topic.
>
> Let's say that I want to run a full-time SIMH emulation of a VAX running VMS
(because I do). This would be my full-time DECnet presence on my local network, my primary
means of moving things between my DECnet-speaking computers and my modern machines, and my
full-time HECnet presence if I ever find a good way to have persistent internet access at
my rural home. The SIMH emulation would be hosted on a Linux server.
>
> It's easy enough to set up the host server to automatically launch a SIMH
emulation at boot time, but I don't know yet how to deal with automatically and
cleanly shutting down the emulation when the host server needs to shut down. In
particular, I'd want to somehow trigger an orderly VMS shutdown when the host server
needs to perform an unattended shutdown, such as when the UPS signals a power failure. If
there's a way to checkpoint the entire emulation and then restore it later, that might
also be a good option, as long as I can prevent corrupting the emulated system's
filesystems by suddenly yanking the virtual power plug.
>
> Is there any prior art for setting up an unattended SIMH-based VAX/VMS emulation like
this?
>
--
Sent via Thunderbird for Windows 10 on Lenovo Legion Y720
11 Jun
11 Jun
6:17 p.m.
Thanks for all of the suggestions. They give me some ideas to work with.
I particularly like the idea of using dntask on the Linux side, but unfortunately that one
breaks the "If you already have a working DECnet network..." requirement. Unless
something has changed more recently than I am aware of, the DECnet support in Linux has
been broken for quite a long time. I had to install a very old distribution on the Linux
VM that I set up for doing some DECnet stuff, but this server would be running a very
recent distribution. It would be very nice if the Linux DECnet code started getting
attention again and could be updated to work in the latest kernels, but that's not a
task that I can take on at this time.
Alternately, it would be neat if there was a DECnet client implementation that could run
entirely in user space. Is there anything like that which I'm not aware of?
I think that the suggestions involving kludging something together to shut down the
emulated system via one of its terminal ports should give me something to work with.
I'll need to experiment to see if I can come up with something that doesn't let
any random user on (or off!) the system to trivially shut it down.
Hmm, I should look at the SIMH source to see if I can come up with a clean way to let SIMH
trigger the shutdown when it receives a SIGHUP.
--
Mark J. Blair <nf6x at nf6x.net>
http://www.nf6x.net/
6:43 p.m.
On Jun 11, 2018, at 12:17 PM, Mark J. Blair <nf6x
at nf6x.net> wrote:
Thanks for all of the suggestions. They give me some ideas to work with.
I particularly like the idea of using dntask on the Linux side, but unfortunately that
one breaks the "If you already have a working DECnet network..." requirement.
Unless something has changed more recently than I am aware of, the DECnet support in Linux
has been broken for quite a long time. I had to install a very old distribution on the
Linux VM that I set up for doing some DECnet stuff, but this server would be running a
very recent distribution. It would be very nice if the Linux DECnet code started getting
attention again and could be updated to work in the latest kernels, but that's not a
task that I can take on at this time.
Alternately, it would be neat if there was a DECnet client implementation that could run
entirely in user space. Is there anything like that which I'm not aware of?
My implementation in Python aims to do that, but so far I only have up to layer 3. I
wonder if Robert Jarrett's C router does.
paul
6:49 p.m.
On Jun 11, 2018, at 9:43 AM, Paul Koning
<paulkoning at comcast.net> wrote:
My implementation in Python aims to do that, but so far I only have up to layer 3. I
wonder if Robert Jarrett's C router does.
Cool! That sounds very promising. I'm looking forward to seeing where that goes.
--
Mark J. Blair <nf6x at nf6x.net>
http://www.nf6x.net/
7:20 p.m.
New subject: Automatic Orderly Shutdown of Emulated VAX/VMS System in SIMH
-----Original Message-----
From: owner-hecnet at Update.UU.SE [mailto:owner-
hecnet at Update.UU.SE] On Behalf Of Mark J. Blair
Sent: 11 June 2018 17:49
To: hecnet at Update.UU.SE
Subject: Re: [HECnet] Automatic Orderly Shutdown of Emulated VAX/VMS
System in SIMH
to
On Jun 11, 2018, at 9:43 AM, Paul Koning
<paulkoning at comcast.net>
wrote:
>
> My implementation in Python aims to do that, but so far I only have up layer 3. I wonder if Robert Jarrett's C router
does.
Cool! That sounds very promising. I'm looking forward to seeing where that
goes.
My user mode router does not go much beyond layer 3 either. I did a little
bit to support some NSP and NetMan, just enough to support a couple of
commands (SHOW KNOWN CIRCUITS and SHOW ADJACENT NODES).
Regards
Rob
8:58 p.m.
On Jun 11, 2018, at 12:17 PM, Mark J. Blair <nf6x
at nf6x.net> wrote:
Thanks for all of the suggestions. They give me some ideas to work with.
I particularly like the idea of using dntask on the Linux side, but unfortunately that
one breaks the "If you already have a working DECnet network..." requirement.
Unless something has changed more recently than I am aware of, the DECnet support in Linux
has been broken for quite a long time. I had to install a very old distribution on the
Linux VM that I set up for doing some DECnet stuff, but this server would be running a
very recent distribution. It would be very nice if the Linux DECnet code started getting
attention again and could be updated to work in the latest kernels, but that's not a
task that I can take on at this time.
Alternately, it would be neat if there was a DECnet client implementation that could run
entirely in user space. Is there anything like that which I'm not aware of?
I think that the suggestions involving kludging something together to shut down the
emulated system via one of its terminal ports should give me something to work with.
I'll need to experiment to see if I can come up with something that doesn't let
any random user on (or off!) the system to trivially shut it down.
Hmm, I should look at the SIMH source to see if I can come up with a clean way to let
SIMH trigger the shutdown when it receives a SIGHUP.
--
Mark J. Blair <nf6x at nf6x.net>
http://www.nf6x.net/
Erik Olofson (e.olofsen at xs4all.nl <mailto:e.olofsen at xs4all.nl>) has a version
of the DECnet code (both kernel and utilities) code updated for a recent Linux kernel - I
have it running on a Raspberry Pi 3B+ running Stretch (kernel 4.14.34-v7+). I recently
submitted a number of patches (CTERM and DAP) to allow it to interoperate with TOPS-10 but
I don?t know if he?s made those available yet.
John.
11:10 p.m.
Please see http://rullf2.xs4all.nl/decnet/
On Mon, Jun 11, 2018 at 02:58:11PM -0400, John Forecast wrote:
On Jun 11, 2018, at 12:17 PM, Mark J. Blair
<nf6x at nf6x.net> wrote:
Thanks for all of the suggestions. They give me some ideas to work with.
I particularly like the idea of using dntask on the Linux side, but unfortunately that
one breaks the "If you already have a working DECnet network..." requirement.
Unless something has changed more recently than I am aware of, the DECnet support in Linux
has been broken for quite a long time. I had to install a very old distribution on the
Linux VM that I set up for doing some DECnet stuff, but this server would be running a
very recent distribution. It would be very nice if the Linux DECnet code started getting
attention again and could be updated to work in the latest kernels, but that's not a
task that I can take on at this time.
Alternately, it would be neat if there was a DECnet client implementation that could run
entirely in user space. Is there anything like that which I'm not aware of?
I think that the suggestions involving kludging something together to shut down the
emulated system via one of its terminal ports should give me something to work with.
I'll need to experiment to see if I can come up with something that doesn't let
any random user on (or off!) the system to trivially shut it down.
Hmm, I should look at the SIMH source to see if I can come up with a clean way to let
SIMH trigger the shutdown when it receives a SIGHUP.
--
Mark J. Blair <nf6x at nf6x.net>
http://www.nf6x.net/
Erik Olofson (e.olofsen at xs4all.nl <mailto:e.olofsen at xs4all.nl>) has a
version of the DECnet code (both kernel and utilities) code updated for a recent Linux
kernel - I have it running on a Raspberry Pi 3B+ running Stretch (kernel 4.14.34-v7+). I
recently submitted a number of patches (CTERM and DAP) to allow it to interoperate with
TOPS-10 but I don???t know if he???s made those available yet.
John.
12 Jun
12 Jun
6:48 p.m.
I'm going to set up a VM and give this a try this weekend. Thank you
SO much for working on this.
-Dave
On 06/11/2018 05:10 PM, Erik Olofsen wrote:
Please see http://rullf2.xs4all.nl/decnet/
On Mon, Jun 11, 2018 at 02:58:11PM -0400, John Forecast wrote:
>
>> On Jun 11, 2018, at 12:17 PM, Mark J. Blair <nf6x at nf6x.net> wrote:
>>
>> Thanks for all of the suggestions. They give me some ideas to work with.
>>
>> I particularly like the idea of using dntask on the Linux side, but unfortunately
that one breaks the "If you already have a working DECnet network..."
requirement. Unless something has changed more recently than I am aware of, the DECnet
support in Linux has been broken for quite a long time. I had to install a very old
distribution on the Linux VM that I set up for doing some DECnet stuff, but this server
would be running a very recent distribution. It would be very nice if the Linux DECnet
code started getting attention again and could be updated to work in the latest kernels,
but that's not a task that I can take on at this time.
>>
>> Alternately, it would be neat if there was a DECnet client implementation that
could run entirely in user space. Is there anything like that which I'm not aware of?
>>
>> I think that the suggestions involving kludging something together to shut down
the emulated system via one of its terminal ports should give me something to work with.
I'll need to experiment to see if I can come up with something that doesn't let
any random user on (or off!) the system to trivially shut it down.
>>
>> Hmm, I should look at the SIMH source to see if I can come up with a clean way to
let SIMH trigger the shutdown when it receives a SIGHUP.
>>
>> --
>> Mark J. Blair <nf6x at nf6x.net>
>> http://www.nf6x.net/
>>
>
> Erik Olofson (e.olofsen at xs4all.nl <mailto:e.olofsen at xs4all.nl>) has a
version of the DECnet code (both kernel and utilities) code updated for a recent Linux
kernel - I have it running on a Raspberry Pi 3B+ running Stretch (kernel 4.14.34-v7+). I
recently submitted a number of patches (CTERM and DAP) to allow it to interoperate with
TOPS-10 but I don???t know if he???s made those available yet.
>
> John.
>
--
Dave McGuire, AK4HZ
New Kensington, PA
2155
days inactive
2157
days old
7 comments
7 participants
participants (7)
-
e.olofsen＠xs4all.nl -
john＠forecast.name -
mcguire＠neurotica.com -
nf6x＠nf6x.net -
paulkoning＠comcast.net -
robert.jarratt＠ntlworld.com -
supratim＠riseup.net