Re: Quectel EC200T USB: Problems with context activation
Hi Sergei, I still cannot understand why ofono does not try to use PAP if the authentication method is set to CHAP by default (because no method set while context creation) and it is "obvious" that PAP should be used. pppd does this BTW, that's why I assumed that it could be "obvious". I am not an expert in this field. Maybe someone could shed a light on the fact that pppd chooses a correct authentication method without a problem and ofono does not? It has been a very long time since we developed PPP (about 10 years now), so my memory may be fuzzy now. But the answer to your question is that it isn't possible to auto-detect this. The issue is, that the 'PPP server' running in the firmware has no clue what the authentication should be. It is literally taking auth frames from the client and forwarding them to the network. The network is the one that actually knows what the authentication details are. 3GPP mandates that CHAP is the 'default' method for such cases. But seems some providers had legacy software that demanded PAP, and instead of fixing the backend they pushed all these details out to the front-end. Hence why you have a need of provisioning data bases like 'mobile-broadband-provider-info' or the android APN db, etc. So, the LCP configuration stage (where the auth options are chosen) is performed prior to any of the frames being exchanged between the modem and the network. You can see this in your log 'ppp_dump_single_port.txt', where gsmdial is configured for CHAP, NAKs the PAP auth proto and the modem firmware happily switches to CHAP. Why the subsequent CHALLENGE messages from the modem go unanswered by gsmdial is not clear to me. Am I correct that my SW has to know which authentication must be used before it attempts to activate context for the first time? This is a big inconvenience. Actually the fact that the context must be activated manually at the first time is the big inconvenience too for embedded systems. But this is not the biggest issue for me right now of course. Unfortunately yes. Look into provisioning contexts automatically. See plugin/provision.c, plugins/file-provision.c > Never tried this myself, but I never really had a reason to. Not sure if there > is an easy way of doing that given you're running over a MUX. If you come up > with a nice way, please share. Sorry, I have not got your point about MUX. I have successfully obtained the dumps. I have 2 ttyUSB devices and gsmdial works fine with one tty as well as with both. Could you elaborate a little bit more on the MUX issue? Didn't you say you have a Quectel device? Some of those are a serial port based modem and require a multiplexer. I guess you have the USB variant so what I said doesn't apply. Please find the dumps attached. I did not find any problems in them. DTE sent a termination request but why? I tried to use the CHAP, PAP and NONE auth metnods but NONE hands with gsm dial. I don't see pppd getting any IPCP protocol going, so I'm not really sure any of this is working. I am going to debug ofono as you suggested: > Maybe put a few debug statements in ppp_auth.c, ppp_pap_start, ppp_pap_timeout > and ppp_pap_process_packet. See if PAP even occurs. Also I have made a small patch for gsmdial that helps to choose auth method. Please find it attached. Feel free to send this in using git send-email. I don't review patches in attachments. Note that the last time I looked at gsmdial was ~9 years ago, so not sure how up to date it is compared to the ppp based gprs context code in drivers/atmodem. You may want to use g_at_ppp_set_recording (maybe via environment variable) from drivers/atmodem/gprs-context.c directly in order to obtain dumps of what is happening when oFono is attempting to activate the context. I use cf9e6d048d65ff4a87f5707b0cc4fd3c036d62fb in my patch because the last commit in master de0d5a19c16bbb3eaba473e0eaaade7f55c48bcb does not build for me because of goto was left in a function without any label. Please see the error below and in the file attached: | ../git/ofono/drivers/gemaltomodem/gprs-context.c: In function 'gemalto_gprs_activate_primary': | ../git/ofono/drivers/gemaltomodem/gprs-context.c:156:3: error: label 'error' used but not defined | goto error; | ^~~~ Please git pull --rebase. I fixed this several days ago and there have been other commits applied since. Maybe I should add some "properties" to context for this modem before activation? Also I am not happy with the idea that I probably need to set an authentication method by hand. Could this really be necessary with ofono in some situations? I added the pppd configuration files of the modem vendor which work fine. Do I need to add something to the context in ofono before activation? See above about provisioning. I strongly believe that ofono as embedded system software has to be as automated as possible. Do you
Re: Quectel EC200T USB: Problems with context activation
Hi Denis,
Thank you for your reply. I still cannot activate the context neither with
ofono nor with gsmdial but pppd does this fine. But, I have not tested pppd
with CHAP, I think it is impossible. I was getting the error below when I
tried:
root@131D2F4C5254324B:/mnt/data# pppd call quectel-ppp &
[1] 18583
root@131D2F4C5254324B:/mnt/data# pppd: The remote system (3gppp) is
required to authenticate itself
pppd: but I couldn't find any suitable secret (password) for it to use to
do so.
^C
[1]+ Done(1) pppd call quectel-ppp
> Looks fine...
I still cannot understand why ofono does not try to use PAP if the
authentication method is set to CHAP by default (because no method set
while context creation) and it is "obvious" that PAP should be used. pppd
does this BTW, that's why I assumed that it could be "obvious". I am not an
expert in this field. Maybe someone could shed a light on the fact that
pppd chooses a correct authentication method without a problem and ofono
does not?
Am I correct that my SW has to know which authentication must be used
before it attempts to activate context for the first time? This is a big
inconvenience. Actually the fact that the context must be activated
manually at the first time is the big inconvenience too for embedded
systems. But this is not the biggest issue for me right now of course.
> Never tried this myself, but I never really had a reason to. Not sure if
there
> is an easy way of doing that given you're running over a MUX. If you
come up
> with a nice way, please share.
Sorry, I have not got your point about MUX. I have successfully obtained
the dumps. I have 2 ttyUSB devices and gsmdial works fine with one tty as
well as with both. Could you elaborate a little bit more on the MUX issue?
Please find the dumps attached. I did not find any problems in them. DTE
sent a termination request but why? I tried to use the CHAP, PAP and NONE
auth metnods but NONE hands with gsm dial.
I am going to debug ofono as you suggested:
> Maybe put a few debug statements in ppp_auth.c, ppp_pap_start,
ppp_pap_timeout
> and ppp_pap_process_packet. See if PAP even occurs.
Also I have made a small patch for gsmdial that helps to choose auth
method. Please find it attached.
I use cf9e6d048d65ff4a87f5707b0cc4fd3c036d62fb in my patch because the last
commit in master de0d5a19c16bbb3eaba473e0eaaade7f55c48bcb does not build
for me because of goto was left in a function without any label. Please
see the error below and in the file attached:
| ../git/ofono/drivers/gemaltomodem/gprs-context.c: In function
'gemalto_gprs_activate_primary':
| ../git/ofono/drivers/gemaltomodem/gprs-context.c:156:3: error: label
'error' used but not defined
|goto error;
|^~~~
Maybe I should add some "properties" to context for this modem before
activation? Also I am not happy with the idea that I probably need to set
an authentication method by hand. Could this really be necessary with ofono
in some situations? I added the pppd configuration files of the modem
vendor which work fine. Do I need to add something to the context in ofono
before activation?
I strongly believe that ofono as embedded system software has to be as
automated as possible. Do you agree?
Any suggestions will be appreciated. I really stuck with this. I do not
want to stop using ofono because of the new modem.
Yours sincerely,
Sergei Golubtsov.
On Wed, Dec 30, 2020 at 5:51 PM Denis Kenzior wrote:
> Hi Sergei,
>
> On 12/30/20 4:00 AM, Sergei Golubtsov wrote:
> > Hello Denis,
> >
> > > Are the username and password set properly on the context?
> >
> > Yes, they are.
> > root@131D2F4C5254324B:~# /usr/lib/ofono/test/list-contexts
> > [ /quectel_0 ]
> > [ /quectel_0/context1 ]
> > Name = Россия
> > Active = 0
> > Type = internet
> > Protocol = ip
> > AccessPointName = internet
> > Username = gdata
> > Password = gdata
> > AuthenticationMethod = pap
> > Settings = { }
> > IPv6.Settings = { }
> >
> > [ /quectel_0/context2 ]
> > Name = МегаФон MMS
> > Active = 0
> > Type = mms
> > Protocol = ip
> > AccessPointName = mms
> > Username = mms
> > Password = mms
> > AuthenticationMethod = pap
> > MessageProxy = 10.10.10.10:8080
> > MessageCenter = http://mmsc:8002
> > Settings = { }
> > IPv6.Settings = { }
> >
>
> Looks fine...
>
> > > And you may want to share the log of oFono activating the context
> configured
> > for PAP.
> >
> > I have added the PAP context activation log file from ofono to
> this email as
> > well as I did in the previous email. Please find it attached. It also
> fails at
>
> It wasn't clear whether the previous log was pap or chap. With chap the
> PPP
> implementation would stop and wait for the chap challenge. So if that
> never
> comes, that would explain why
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