12 Nov
2021
12 Nov
'21
8:46 p.m.
My network scanner is getting very strange responses from three different nodes all
misbehaving the same way: CAIR, MAGPIE, and FARGO.
What I see is:
1. The connection to object 19 (NICE, the network management listener) is accepted, but
the version number that is supposed to be sent as part of the accept is missing.
2. When I send a NICE request to the node, I get back a message with this content:
<28>Nov 12 20:35:16 dnetd[1688]: Cannot chdir to /nonexistent : No such file or
directory\n\xff\x00\x00
All three nodes do this. Configuration error that just happens to exist on all three?
paul
12 Nov
12 Nov
9:26 p.m.
MAGPIE is running John Forecast?s RaspbianDECnet. I?ll shut it down. I
think it tries to use the nobody account - when it should probably have its
own decent account. Later on today I?ll have a look into this.
Tony
On Sat, 13 Nov 2021 at 06:46, Paul Koning <paulkoning at comcast.net> wrote:
My network scanner is getting very strange responses
from three different
nodes all misbehaving the same way: CAIR, MAGPIE, and FARGO.
What I see is:
1. The connection to object 19 (NICE, the network management listener) is
accepted, but the version number that is supposed to be sent as part of the
accept is missing.
2. When I send a NICE request to the node, I get back a message with this
content:
<28>Nov 12 20:35:16 dnetd[1688]: Cannot chdir to /nonexistent : No such
file or directory\n\xff\x00\x00
All three nodes do this. Configuration error that just happens to exist
on all three?
paul
--
Tony Nicholson <tony.nicholson at computer.org>
9:28 p.m.
*decnet account.
On Sat, 13 Nov 2021 at 07:26, Tony Nicholson <tony.nicholson at computer.org>
wrote:
MAGPIE is running John Forecast?s RaspbianDECnet.
I?ll shut it down. I
think it tries to use the nobody account - when it should probably have its
own decent account. Later on today I?ll have a look into this.
--
Tony Nicholson <tony.nicholson at computer.org>
9:54 p.m.
Just to be clear: this isn't causing any problems, it's just an oddity in the scan
processing. I wanted to make sure I'm not doing something incorrect.
The only part that's at all a (future) concern is the connect accept with no data,
because that's supposed to be the version number and I'm working on some
enhancements that will actually care about what the version number is.
paul
On Nov 12, 2021, at 3:26 PM, Tony Nicholson
<tony.nicholson at computer.org> wrote:
MAGPIE is running John Forecast?s RaspbianDECnet. I?ll shut it down. I think it tries
to use the nobody account - when it should probably have its own decent account. Later on
today I?ll have a look into this.
Tony
On Sat, 13 Nov 2021 at 06:46, Paul Koning <paulkoning at comcast.net
<mailto:paulkoning at comcast.net>> wrote:
My network scanner is getting very strange responses from three different nodes all
misbehaving the same way: CAIR, MAGPIE, and FARGO.
What I see is:
1. The connection to object 19 (NICE, the network management listener) is accepted, but
the version number that is supposed to be sent as part of the accept is missing.
2. When I send a NICE request to the node, I get back a message with this content:
<28>Nov 12 20:35:16 dnetd[1688]: Cannot chdir to /nonexistent : No such file or
directory\n\xff\x00\x00
All three nodes do this. Configuration error that just happens to exist on all three?
paul
--
Tony Nicholson <tony.nicholson at computer.org <mailto:tony.nicholson at
computer.org>>
10:03 p.m.
Try 29.115 - it?s also running the raspbian DECnet with nml2 and fal2 code.
On 12 Nov 2021, at 20:54, Paul Koning <paulkoning at comcast.net> wrote:
? Just to be clear: this isn't causing any problems, it's just an oddity in the
scan processing. I wanted to make sure I'm not doing something incorrect.
The only part that's at all a (future) concern is the connect accept with no data,
because that's supposed to be the version number and I'm working on some
enhancements that will actually care about what the version number is.
paul
On Nov 12, 2021, at 3:26 PM, Tony Nicholson <tony.nicholson at
computer.org<mailto:tony.nicholson at computer.org>> wrote:
MAGPIE is running John Forecast?s RaspbianDECnet. I?ll shut it down. I think it tries to
use the nobody account - when it should probably have its own decent account. Later on
today I?ll have a look into this.
Tony
On Sat, 13 Nov 2021 at 06:46, Paul Koning <paulkoning at
comcast.net<mailto:paulkoning at comcast.net>> wrote:
My network scanner is getting very strange responses from three different nodes all
misbehaving the same way: CAIR, MAGPIE, and FARGO.
What I see is:
1. The connection to object 19 (NICE, the network management listener) is accepted, but
the version number that is supposed to be sent as part of the accept is missing.
2. When I send a NICE request to the node, I get back a message with this content:
<28>Nov 12 20:35:16 dnetd[1688]: Cannot chdir to /nonexistent : No such file or
directory\n\xff\x00\x00
All three nodes do this. Configuration error that just happens to exist on all three?
paul
--
Tony Nicholson <tony.nicholson at computer.org<mailto:tony.nicholson at
computer.org>>
13 Nov
13 Nov
2:24 a.m.
That one is fine, it reports being an endnote and I see the right version number
paul
On Nov 12, 2021, at 4:03 PM, Keith Halewood
<Keith.Halewood at pitbulluk.org> wrote:
Try 29.115 - it?s also running the raspbian DECnet with nml2 and fal2 code.
> On 12 Nov 2021, at 20:54, Paul Koning <paulkoning at comcast.net> wrote:
>
> ? Just to be clear: this isn't causing any problems, it's just an oddity in
the scan processing. I wanted to make sure I'm not doing something incorrect.
>
> The only part that's at all a (future) concern is the connect accept with no
data, because that's supposed to be the version number and I'm working on some
enhancements that will actually care about what the version number is.
>
> paul
>
>> On Nov 12, 2021, at 3:26 PM, Tony Nicholson <tony.nicholson at computer.org
<mailto:tony.nicholson at computer.org>> wrote:
>>
>> MAGPIE is running John Forecast?s RaspbianDECnet. I?ll shut it down. I think it
tries to use the nobody account - when it should probably have its own decent account.
Later on today I?ll have a look into this.
>>
>> Tony
>>
>> On Sat, 13 Nov 2021 at 06:46, Paul Koning <paulkoning at comcast.net
<mailto:paulkoning at comcast.net>> wrote:
>> My network scanner is getting very strange responses from three different nodes
all misbehaving the same way: CAIR, MAGPIE, and FARGO.
>>
>> What I see is:
>>
>> 1. The connection to object 19 (NICE, the network management listener) is
accepted, but the version number that is supposed to be sent as part of the accept is
missing.
>>
>> 2. When I send a NICE request to the node, I get back a message with this
content:
>>
>> <28>Nov 12 20:35:16 dnetd[1688]: Cannot chdir to /nonexistent : No such
file or directory\n\xff\x00\x00
>>
>> All three nodes do this. Configuration error that just happens to exist on all
three?
>>
>> paul
>>
>> --
>> Tony Nicholson <tony.nicholson at computer.org <mailto:tony.nicholson at
computer.org>>
>
12 Nov
12 Nov
10:18 p.m.
On Nov 12, 2021, at 2:46 PM, Paul Koning
<paulkoning at comcast.net> wrote:
My network scanner is getting very strange responses from three different nodes all
misbehaving the same way: CAIR, MAGPIE, and FARGO.
What I see is:
1. The connection to object 19 (NICE, the network management listener) is accepted, but
the version number that is supposed to be sent as part of the accept is missing.
2. When I send a NICE request to the node, I get back a message with this content:
<28>Nov 12 20:35:16 dnetd[1688]: Cannot chdir to /nonexistent : No such file or
directory\n\xff\x00\x00
All three nodes do this. Configuration error that just happens to exist on all three?
paul
Those systems must be running DECnet for Linux. dnetd performs the mapping from an inbound
connect request and runs the appropriate daemon/user application. Assuming the object
database (/etc/dnetd.conf) has not been changed from the default, user ?nobody? has a home
directory of /nonexistent (which does not exist). The warning should be benign since it
will default running with the current directory of ?/?, although I?m not sure that?s good
- ?/tmp? may be a better default. I?m not sure where the extra hex values are coming from.
Are you seeing this as the reply to the NICE request? It should only be written to
syslog.
John.
10:43 p.m.
On Nov 12, 2021, at 4:18 PM, John Forecast <john at
forecast.name> wrote:
Yes, it appears in response to a NICE request. What's strange is that the connection
is accepted. If there's something wrong with the object, it shouldn't result in
a connect confirm but rather a connect reject (a.k.a., disconnect initiate with a suitable
reason code). The connect confirm tells the requesting end that the object is operational
and ready to accept requests. If something then goes wrong, that's ok but in that
case the requesting end expects an error reply according to the protocol. In this case
that would be some sort of NICE error message reporting a problem executing the request.
paul
On Nov 12, 2021, at 2:46 PM, Paul Koning
<paulkoning at comcast.net> wrote:
My network scanner is getting very strange responses from three different nodes all
misbehaving the same way: CAIR, MAGPIE, and FARGO.
What I see is:
1. The connection to object 19 (NICE, the network management listener) is accepted, but
the version number that is supposed to be sent as part of the accept is missing.
2. When I send a NICE request to the node, I get back a message with this content:
<28>Nov 12 20:35:16 dnetd[1688]: Cannot chdir to /nonexistent : No such file or
directory\n\xff\x00\x00
All three nodes do this. Configuration error that just happens to exist on all three?
paul
Those systems must be running DECnet for Linux. dnetd performs the mapping from an
inbound connect request and runs the appropriate daemon/user application. Assuming the
object database (/etc/dnetd.conf) has not been changed from the default, user ?nobody? has
a home directory of /nonexistent (which does not exist). The warning should be benign
since it will default running with the current directory of ?/?, although I?m not sure
that?s good - ?/tmp? may be a better default. I?m not sure where the extra hex values are
coming from. Are you seeing this as the reply to the NICE request? It should only be
written to syslog.
John.
11:52 p.m.
Just out of curiosity - what are FEDACH and FOMFOR telling your scanner?
On Nov 12, 2021, at 2:46 PM, Paul Koning
<paulkoning at comcast.net> wrote:
?My network scanner is getting very strange responses from three different nodes all
misbehaving the same way: CAIR, MAGPIE, and FARGO.
What I see is:
1. The connection to object 19 (NICE, the network management listener) is accepted, but
the version number that is supposed to be sent as part of the accept is missing.
2. When I send a NICE request to the node, I get back a message with this content:
<28>Nov 12 20:35:16 dnetd[1688]: Cannot chdir to /nonexistent : No such file or
directory\n\xff\x00\x00
All three nodes do this. Configuration error that just happens to exist on all three?
paul
13 Nov
13 Nov
2:22 a.m.
You can see the answer here: http://akdesign.dyndns.org:8080/map/data
<http://akdesign.dyndns.org:8080/map/data> . They show as type "unknown"
because Linux (at least with the NML version you're using) does not send a valid reply
to the "show executor characteristics" request -- the node type is missing.
paul
On Nov 12, 2021, at 5:52 PM, Supratim Sanyal
<supratim at riseup.net> wrote:
Just out of curiosity - what are FEDACH and FOMFOR telling your scanner?
> On Nov 12, 2021, at 2:46 PM, Paul Koning <paulkoning at comcast.net> wrote:
>
> ?My network scanner is getting very strange responses from three different nodes all
misbehaving the same way: CAIR, MAGPIE, and FARGO.
>
> What I see is:
>
> 1. The connection to object 19 (NICE, the network management listener) is accepted,
but the version number that is supposed to be sent as part of the accept is missing.
>
> 2. When I send a NICE request to the node, I get back a message with this content:
>
> <28>Nov 12 20:35:16 dnetd[1688]: Cannot chdir to /nonexistent : No such file or
directory\n\xff\x00\x00
>
> All three nodes do this. Configuration error that just happens to exist on all
three?
>
> paul
>
2:25 a.m.
On 11/12/21 8:22 PM, Paul Koning wrote:
You can see the answer here:
http://akdesign.dyndns.org:8080/map/data?. ?They show as type
"unknown" because Linux (at least with the NML version you're using)
does not send a valid reply to the "show executor characteristics"
request -- the node type is missing.
Got it. Neat. Something needs to be done about it. Thanks Paul.
paul
--
On Nov 12, 2021, at 5:52 PM, Supratim Sanyal
<supratim at riseup.net> wrote:
Just out of curiosity - what are FEDACH and FOMFOR telling your scanner?
> On Nov 12, 2021, at 2:46 PM, Paul Koning <paulkoning at comcast.net> wrote:
>
> ?My network scanner is getting very strange responses from three
> different nodes all misbehaving the same way: CAIR, MAGPIE, and FARGO.
>
> What I see is:
>
> 1. The connection to object 19 (NICE, the network management
> listener) is accepted, but the version number that is supposed to be
> sent as part of the accept is missing.
>
> 2. When I send a NICE request to the node, I get back a message with
> this content:
>
> <28>Nov 12 20:35:16 dnetd[1688]: Cannot chdir to /nonexistent : No
> such file or directory\n\xff\x00\x00
>
> All three nodes do this. ?Configuration error that just happens to
> exist on all three?
>
> ??paul
>
14 Nov
14 Nov
3:35 p.m.
On Fri, Nov 12, 2021 at 08:25:17PM -0500, Supratim Sanyal wrote:
On 11/12/21 8:22 PM, Paul Koning wrote:
This may be fixed in a later/current version of nml2.
You can see the answer here:
http://akdesign.dyndns.org:8080/map/data??.
??They show as type "unknown" because Linux (at least with the NML
version you're using) does not send a valid reply to the "show executor
characteristics" request -- the node type is missing.
Got it. Neat. Something needs to be done about it. Thanks Paul.
paul
-- On Nov 12, 2021, at 5:52 PM, Supratim Sanyal
<supratim at riseup.net> wrote:
Just out of curiosity - what are FEDACH and FOMFOR telling your scanner?
> On Nov 12, 2021, at 2:46 PM, Paul Koning <paulkoning at comcast.net> wrote:
>
> ???My network scanner is getting very strange responses from
> three different nodes all misbehaving the same way: CAIR,
> MAGPIE, and FARGO.
>
> What I see is:
>
> 1. The connection to object 19 (NICE, the network management
> listener) is accepted, but the version number that is supposed
> to be sent as part of the accept is missing.
>
> 2. When I send a NICE request to the node, I get back a message
> with this content:
>
> <28>Nov 12 20:35:16 dnetd[1688]: Cannot chdir to /nonexistent :
> No such file or directory\n\xff\x00\x00
>
> All three nodes do this. ??Configuration error that just happens
> to exist on all three?
>
> ????paul
>
1104
days inactive
1106
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11 comments
6 participants
participants (6)
-
e.olofsen＠xs4all.nl -
john＠forecast.name -
Keith.Halewood＠pitbulluk.org -
paulkoning＠comcast.net -
supratim＠riseup.net -
tony.nicholson＠computer.org