It did show connect ---> /dev/pts/3 or so, but then timed out.
I really wanted just to make sure I understood correctly too that pppd
communicates to ppp_relay via stdin and stdout. And I understand
pppd_relay talks to the phone and then sends whatever, via stdout, to pppd
and then ppp_relay also reads from pppd and converts and does whatever
and sends back to the phone:
pppd <-----> ppp_relay <===============> phone
??
-----Original Message-----
From: Bill Unruh [mailto:unruh@xxxxxxxxxxxxxx]
Sent: Wednesday, October 28, 2009 03:23 PM
To: tony.chamberlain@xxxxxxxxx
Cc: 'ppp, Linux'
Subject: Re: pty
I presume that you have the program ppp_relay which you say he wrote. You will
have to look into that to see what it does.
man pppd
pty script
Specifies that the command script is to be used to commu-
nicate rather than a specific terminal device. Pppd will
allocate itself a pseudo-tty master/slave pair and use
the slave as its terminal device. The script will be run
in a child process with the pseudo-tty master as its
standard input and output. An explicit device name may
not be given if this option is used. (Note: if the
record option is used in conjuction with the pty option,
the child process will have pipes on its standard input
and output.)
pppd connects it stdout to that program's stdin, and stdin to that program's
stdout. Ie, that program is responsible for all communications with the phone.
You will have to look at it to see why no responses are generated. ( you could
also look at the debug output of pppd to see what pppd is seeing-- you can up
the log level to get more detailed info.
pppd uses the daemon log facility of syslog for its error messages.
iYou need something like
daemon.* /var/log/daemonlog
in /etc/syslog.conf
to get the stuff output to the file /var/log/daemonlog.
See the entry for "debug" in man pppd
On Wed, 28 Oct 2009, tony.chamberlain@xxxxxxxxx wrote:
> This is somewhat different from my other question and is on a different
> system and of course the person who developed it left.
>
> There is a mobile phone which connects to a CDMA BTS and then from there
> to a Linux machine. A process called pdsn is running on the linux machine
> and detects when the mobile phone calls. It then spawns a process with
> a bunch of parameters (port, ip, etc) like this
>
> pppd pty 'ppp_relay -p port -a address ...'
>
> So pppd uses ppp_relay (which is also something he wrote) to handle the
> ppp stuff.
>
> Now this worked on Red Hat 9 but there seems to be a problem on CentOS 4.5.
>> From what I can tell, ppp_relay receives a TCP port number (I guess from
> pdsn?) and tries to communicate to the pppd process through this port.
> It sends a message but never gets a response.
>
> I am curious how the pppd pty process (in this case ppp_relay) communicates
> to pppd? We did a netstat and found pppd but no TCP nor UDP ports were
> associated with it. It was just a UNIX-type process.
>
> Is ppp_relay attempting to talk through a port when it should be using
> some kind of Linux message?
>
>
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--
William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273
Physics&Astronomy | Advanced Research | Fax: +1(604)822-5324
UBC, Vancouver,BC | Program in Cosmology | unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1 | and Gravity | www.theory.physics.ubc.ca/
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