[CLUE-Tech] mgetty and ppp troubles on linux dialin server

[Jim Ockers]

Hi Daniel,

Please consider turning on debug in ppp.  Add "debug" as a line in your
pppd options file.

Do this on both ends, if they are both Linux.  You should see a nice
record of the PPP conversation, if pppd is talking.  You will also 
see why the conversation is terminated, if that's what's happening.

If you are concerned about the authentication try "noauth" as an
option.  In particular the "client" should not try to authenticate
the server, unless you are seriously paranoid and clueful about
PPP and Linux pppd.  Also FYI I have noauth on my server as well,
and require-pap.

You should also spend some time reading the pppd man page.

As far as passwords go, here is the /etc/ppp/pap-secrets file for 
the server, so that the /etc/passwd file is checked for the password,
and all users listed in /etc/passwd can log in:

# Secrets for authentication using PAP
# client        server  secret                  IP addresses
*               *       ""

For some reason it is hard to get that information on the 'net
and it's not in the man page.  That works for me, YMMV.

Don't forget to put "noauth" as an option for the client, unless
you are sure you know what you are doing.

Hope this helps,
Jim

daniel wrote:
> 
> Hi Jim,
> 
> I got to do some major testing after I got the new modem all set up.  The
> modems can CONNECT perfectly now. Hopefully the last snag that I am running
> into is that PAP authentication does not seem to succeed.
> 
> Here is what I see from the client using minicom to dial into the server:
> ---
> ATZ
> OK
> atdt 3034840000
> CONNECT 24000
> 
> PROTOCOL:LAPM
> 
> ns1 login: carol
> Looking for secret in /etc/ppp/pap-secrets for client (null) server ns1
> Got client carol
> Got server *
> Got secret *
> Got auth_addr *
> Got client *~b???^\^F^F|FE}xD||E}~Y{EE~ilg&^\CCGzE}|Dd||AYy1}g&H|zE}|Dd|1AYy~}g&H|
> zE}|Dd|1AYy~}g>^\^F^F|FE}xD||E}~Y{
> 
> ~hlg6^\CC|zE}|Dt||AYy1}g&H|zE}|DD|1AYy}g6^\^F^F}xDt||A}~Yy1}g6^\CC|zE}xDt||A}~Yy1}
> NO CARRIER 
> ---
> 
> It takes 30 seconds to drop to NO CARRIER after login. No ppp0 interface is
> set up.
> (Side questions: does that "client (null)" just mean no hostname is known for
> the client? Should the "Got secret *" line actually print the password instead
> of a *?)
> Here is the messages log from the server:
> ---
> Apr 22 15:57:59 ns1 mgetty[22833]: data dev=ttyS0, pid=22833, caller='none',
> conn='38400', name='', cmd='/usr/sbin/pppd', user='/AutoPPP/'
> Apr 22 15:58:00 ns1 pppd[22833]: pppd 2.4.1 started by root, uid 0
> Apr 22 15:58:00 ns1 pppd[22833]: Using interface ppp0
> Apr 22 15:58:00 ns1 pppd[22833]: Connect: ppp0 <--> /dev/tts/0
> Apr 22 15:58:30 ns1 pppd[22833]: LCP: timeout sending Config-Requests 
> Apr 22 15:58:30 ns1 pppd[22833]: Connection terminated.
> Apr 22 15:58:30 ns1 pppd[22833]: Exit.
> ---
> 
> The server's mgetty.log.ttyS0 file shows:
> ---
> 04/22 15:54:26 yS0  send: ATA[0d]
> 04/22 15:54:26 yS0  waiting for ``CONNECT''
> 04/22 15:54:26 yS0   got: ATA[0d]
> 04/22 15:54:26 yS0    CND: OKATA[0d][0a]CONNECT ** found **
> 04/22 15:54:47 yS0  send: 
> 04/22 15:54:47 yS0  waiting for ``_''
> 04/22 15:54:47 yS0   got:  38400[0d]
> 04/22 15:54:47 yS0    CND: CONNECT 38400
> 04/22 15:54:47 yS0    CND: found: 38400[0a] ** found **
> 04/22 15:54:47 yS0   waiting for line to clear (VTIME), read: 
> 04/22 15:54:47 yS0    looking for utmp entry... (my PID: 21987)
> 04/22 15:54:47 yS0   utmp + wtmp entry made
> 04/22 15:54:48 yS0   tio_set_flow_control( HARD )
> 04/22 15:54:48 yS0   print welcome banner (/etc/issue)
> 04/22 15:54:48 yS0   getlogname (AUTO_PPP), read:~[ff]}#[c0]!
> 04/22 15:54:48 yS0   input finished with '\r', setting ICRNL ONLCR
> 04/22 15:54:48 yS0   tio_get_rs232_lines: status: RTS CTS DSR DTR DCD
> 04/22 15:54:48 yS0    login: use login config file
> /etc/mgetty+sendfax/login.config
> 04/22 15:54:48 yS0   match: user='/AutoPPP/', key=''
> 04/22 15:54:48 yS0   match: user='/AutoPPP/', key=''
> 04/22 15:54:48 yS0   match: user='/AutoPPP/', key='/AutoPPP/'*** hit!
> 04/22 15:54:48 yS0   calling login: cmd='/usr/sbin/pppd', argv[]='pppd file
> /etc/ppp/options.server'
> 04/22 15:54:48 yS0   setenv: 'CALLER_ID=none'
> 04/22 15:54:48 yS0   setenv: 'CONNECT=38400'
> 04/22 15:54:48 yS0   setenv: 'DEVICE=ttyS0'
> 04/22 15:54:48 ##### data dev=ttyS0, pid=21987, caller='none', conn='38400',
> name='', cmd='/usr/sbin/pppd', user='/AutoPPP/'
> 04/22 15:55:18 yS0  mgetty: experimental test release 1.1.30-Dec16
> 04/22 15:55:18 yS0  check for lockfiles
> 04/22 15:55:18 yS0   checklock: no active process has lock, will remove
> 04/22 15:55:18 yS0  locking the line
> 04/22 15:55:18 yS0   makelock(ttyS0) called
> 04/22 15:55:18 yS0   do_makelock: lock='/var/lock/LCK..ttyS0'
> 04/22 15:55:18 yS0   lock made
> 04/22 15:55:19 yS0   tio_get_rs232_lines: status: RTS CTS DSR DTR
> 04/22 15:55:19 yS0  lowering DTR to reset Modem
> 04/22 15:55:19 yS0   tss: set speed to 38400 (017)
> 04/22 15:55:19 yS0   tio_set_flow_control( HARD )
> 04/22 15:55:19 yS0   waiting for line to clear (VTIME), read: [0a][0a]NO
> CARRIER[0a][0a]
> 04/22 15:55:20 yS0  send: \dATQ0V1H0[0d]
> 04/22 15:55:20 yS0  waiting for ``OK''
> 04/22 15:55:20 yS0   got: ATQ0V1H0[0d]
> 04/22 15:55:20 yS0    CND: ATQ0V1H0[0d][0a]OK ** found **
> 04/22 15:55:20 yS0  send: ATS0=0Q0&D3&C1[0d]
> 04/22 15:55:20 yS0  waiting for ``OK''
> 04/22 15:55:20 yS0   got: [0d]
> 04/22 15:55:20 yS0    CND: OK[0a]ATS0=0Q0&D3&C1[0d]
> 04/22 15:55:20 yS0    CND: ATS0=0Q0&D3&C1[0d][0a]OK ** found **
> 04/22 15:55:20 yS0   waiting for line to clear (VTIME), read: [0d][0a]
> 04/22 15:55:21 yS0   removing lock file
> 04/22 15:55:21 yS0  waiting...
> ---
> 
> This is the server's login.config file:
> ---
> /AutoPPP/ - - /usr/sbin/pppd file /etc/ppp/options.server
> *       -       -       /bin/login @
> #*      -       ppp     /usr/sbin/pppd file /etc/ppp/options.server
> ---
> At one point I tried commenting out the "/bin/login" line and adding the last
> line (which is now commented out) "* - ppp /usr/sbin/pppd file
> /etc/ppp/options.server" when I was continually being logged into the command
> line. The change caused pppd to be started upon login, though the same 30
> seconds of modem barf and NO CARRIER resulted.
> 
> Here is the server's pap-secrets file entry:
> #client  server  secret      ip addresses
> carol          *        "testing"          *
> 
> Here is the client's pap-secrets file entry:
> #client  server  secret      ip addresses
> carol          *        "testing"          *
> 
> Should I have the "s around the password?  And does including/excluding the
> last * for "ip addresses" make much difference if I would like to be able to
> dial in from any ip address?
> (auto-generated entries do not seem to put the last * I noticed)
> 
> Thanks again,
> -Daniel Stickney