chat for ppp, from ppp 2.1.2
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lars
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5
usr.bin/chat/Example
Normal file
5
usr.bin/chat/Example
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#
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../pppd/pppd -d connect 'chat "" ATDT5551212 CONNECT "" ogin: ppp' netmask 255.255.255.0 /dev/com1 38400
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../pppd/pppd connect 'chat "" AATDT5551212 CONNECT "" ogin: ppp' netmask 255.255.255.0 /dev/com1 38400
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169
usr.bin/chat/README
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169
usr.bin/chat/README
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I run PPP between crappie.morningstar.com (137.175.6.3, my home
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machine) and remora.morningstar.com (137.175.2.7, my workstation at
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the office). This document describes how I use it. The installation
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of PPP itself is covered in the PPP distribution.
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I put a line like this in remora's /etc/passwd:
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Pkarl:2y4613BDaQD3x:51:10:Karl's PPP login:/tmp:/usr/local/etc/pppstart
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I created a login shell script on remora called
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/usr/local/etc/pppstart:
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#!/bin/sh
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/usr/bin/mesg n
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stty -tostop
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exec /usr/local/etc/ppp 137.175.2.7:
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I use the ppp-on command to bring up a connection, and ppp-off to shut
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it down. These shell scripts, plus the unlock and fix-cua scripts and
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the source to the chat program are included. You will need to heavily
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modify these to suit your own situation, including Internet addresses,
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machine names, telephone numbers, modem dialing commands, baud rates,
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login names and passwords. Make the "ppp..." command in the ppp-on
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script look something like this:
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ppp 137.175.6.3: /dev/cua &
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The "137.175.6.3:" is of the format "local-addr:remote-addr" with the
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remote address null (it will be negotiated by PPP). Look at the login
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shell script above; it can be common to all dial-in PPP users on your
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machine because it only specifies the address of the remora
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(receiving) end of the link.
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If you use the enclosed chat and unlock programs, be sure they are
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suid uucp, and fix-cua should be suid root. The ppp-on script should
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be chmod 700, owner yourself, to keep the password (semi-) secure.
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I use the following eeprom settings and /dev and /etc/ttytab entries
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in order to support dial-in and dial-out on a single phone line:
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crappie 12% eeprom | grep ttya
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ttya-mode=19200,8,1,n,h
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ttya-rts-dtr-off=false
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ttya-ignore-cd=false
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crappie 13% ls -lg /dev/cua /dev/ttya
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crw-rw-rw- 1 root staff 12, 128 Nov 20 09:14 /dev/cua
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crw--w--w- 1 root wheel 12, 0 Nov 20 08:25 /dev/ttya
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crappie 14% grep ttya /etc/ttytab
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ttya "/usr/etc/getty std.19200" unknown on
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crappie 15%
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On SunOS 4.1 and later, make sure that the /etc/ttytab line for ttya
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doesn't say "local":
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ttya "/usr/etc/getty std.38400" unknown on
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Make sure your modem passes data transparently; watch out especially
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for ^S, ^Q, ^P (UUCP spoofing) and parity problems. I have a Telebit
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Trailblazer+ attached to /dev/ttya with the following register
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settings:
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aaatz
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OK
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aat&n
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E1 F1 M1 Q6 P V1 X0 Version BA4.00
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S00=001 S01=000 S02=043 S03=013 S04=010 S05=008 S06=002 S07=060 S08=002 S09=006
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S10=007 S11=070 S12=050
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S45=000 S47=004 S48=000 S49=000
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S50=000 S51=005 S52=002 S53=003 S54=001 S55=000 S56=017 S57=019 S58=002 S59=000
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S60=000 S61=000 S62=003 S63=001 S64=000 S65=000 S66=001 S67=000 S68=255
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S90=000 S91=000 S92=001 S95=000
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S100=000 S101=000 S102=000 S104=000
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S110=001 S111=030 S112=001
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S121=000
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N0:
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N1:
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N2:
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N3:
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N4:
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N5:
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N6:
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N7:
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N8:
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N9:
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OK
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And, the following entry is in /etc/gettytab:
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#
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# 19200/2400 dialin for Telebit Trailblazer+ modem
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#
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T|T19200:dial-19200:\
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:nx=T2400:sp#19200:
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T2400|dial-2400:\
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:nx=T19200:sp#2400:
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My chat script dialing command looks like "ATs50=255s111=0DT4515678"
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instead of just "ATDT4515678" in order to force a PEP mode connection
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and to disable the UUCP spoofing (otherwise, the modem swallows or
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delays ^P characters).
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I run /usr/etc/in.routed on crappie (the calling end) and have this in
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my /etc/gateways file:
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net 0.0.0.0 gateway remora metric 1 passive
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host crappie gateway crappie metric 0 passive
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Routed is started in /etc/rc.local. This way, I don't have to
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manually add or delete routes when links come up. I ifconfig the ppp0
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interface on crappie at boot time like this (in /etc/rc.local with the
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other ifconfig's):
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ifconfig ppp0 crappie remora netmask 0xffffff00 down
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I put "init ppp_attach" in my /sys/sun4c/conf/CRAPPIE file so that the
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above ifconfig down will work:
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pseudo-device ppp1 init ppp_attach # Point-to-Point Protocol, 1 line
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Routed now keeps my routes sane at the crappie.MorningStar.Com end.
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My ethernet (le0) and PPP (ppp0) interfaces are configured with the
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same address and netmask. IP is smart enough to figure out (via the
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routes in /etc/gateways) that everything useful needs to go out ppp0.
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Also, the remora end of my PPP link is configured the same way -- the
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ppp0 interface there is configured with the same address and netmask
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as remora's le0 ethernet. This means that separate interface names
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like "remora-ppp" are not needed; point-to-point links (whether PPP,
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Xerox Synchronous Point-to-Point Protocol, SLIP, IGP or whatever) have
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(apparently) been used this (seemingly bizarre) way for some time.
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This works because when IP looks at a POINTOPOINT link it ignores the
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local address (unlike an ethernet interface) and only looks at the
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remote address.
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Here's what netstat shows for me:
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crappie 109% netstat -r
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Routing tables
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Destination Gateway Flags Refcnt Use Interface
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localhost localhost UH 0 0 lo0
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crappie crappie UH 1 11339 le0
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default remora UG 0 1266 ppp0
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mstar-net-ppp-remora crappie U 0 0 le0
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crappie 110% netstat -rn
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Routing tables
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Destination Gateway Flags Refcnt Use Interface
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127.0.0.1 127.0.0.1 UH 0 0 lo0
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137.175.6.3 137.175.6.3 UH 1 11339 le0
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default 137.175.2.7 UG 0 1266 ppp0
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137.175.6.0 137.175.6.3 U 0 0 le0
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crappie 111%
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The default route to remora is a result of the first line in the
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/etc/gateways file ("default" can't be used there; you have to say
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"0.0.0.0").
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On the network at work, I add a static route in our gateway machine's
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/etc/rc.local file:
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/usr/etc/route add net 137.175.6 remora 1
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All the other machines in the office have default routes pointing at
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the gateway machine, and all PPP-connected external machines are on the
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137.175.6 subnet.
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Send me mail or post to the newsgroup comp.protocols.ppp if you have
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any questions.
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Karl Fox <karl@MorningStar.Com>
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129
usr.bin/chat/connect-ppp
Executable file
129
usr.bin/chat/connect-ppp
Executable file
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#!/bin/sh
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#
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# USAGE: connect-ppp <host>
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#
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# Set up a PPP link to host.
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#
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# This script locks the tty so that faxd and uucp will not
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# interfere. If you are running with faxd as you "getty" then
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# faxd will remove the lock once it notices that pppd is gone.
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# This is the reason for pppd running in with the -detach flag,
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# and you probably would run this script in the background.
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#
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# I had to create the nodropdtr option to pppd in order to be
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# able to do what the script is doing here. Pathces has been
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# sent to the respective people, but I don't know if they like
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# them :-).
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#
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# Look for comments with <LOCAL> in the string. They identify
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# things that you want to set for your system
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#<LOCAL> define whatever your config file is.
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CON_DB=/etc/ppp-connections
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#<LOCAL> define whatever your device is.
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DEVICE=tty00
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#<LOCAL> define whatever your device speed is.
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DEVICESPEED=57600
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#<LOCAL> define whatever your lock directory is.
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LOCKDIR=/var/spool/lock
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LOCKFILE=$LOCKDIR/LCK..$DEVICE
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#<LOCAL> define whatever debug level you want.
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DEBUG="-d -d -d -d"
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# Check that we got a name to connect to. This need not be an actuall hostname
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# just the name you specified in the config file.
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if [ $# -ne 1 ] ; then
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echo "Usage: $0 <host> &"
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exit 1
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fi
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# Get the configuration that is in effect for <name>
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LINE=`grep "^$1" $CON_DB`
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if [ -z "$LINE" ] ; then
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echo "Unknow host $1"
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exit 1
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fi
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# parse the CON_DB. The format is:
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#
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# <hostname>:<phone number>:<user id>:<password>:<local ip address>:\
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# <remove_ip_address><netmask>:<pppd options>
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#
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# The last three are optional. But I would recomend specifying a netmask also
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# when you specify a ip address.
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IP_ADDR=""
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IFS=':'
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set $LINE
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IFS=' '
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HOST=$1
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PHONE=$2
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USER=$3
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PASSWORD=$4
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OUR_IP_ADDR=$5
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THEIR_IP_ADDR=$6
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NETMASK=$7
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shift 7
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OPTIONS=$*
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if [ -f $LOCKFILE ] ; then
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echo "PPP device is locked"
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exit 1
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else
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# Lock the device
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# faxd and UUCP wants 10 character lock id.
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echo "$$" | awk '{printf("%10s",$0)}' > $LOCKFILE
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fi
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#Do we know our local ip address? If so pppd needs a : at the end of it.
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if [ ! -z "$OUR_IP_ADDR" ] ; then
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IP_ADDR=${OUR_IP_ADDR}:${THEIR_IP_ADDR}
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fi
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#Did we specify a netmask? If so convert to pppd format.
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if [ ! -z "$NETMASK" ] ; then
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NETMASK="netmask ${NETMASK}"
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fi
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# Do the actual work in a subshell so that we can turn off tostop and set
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# the tty speed before chat dials. The second reason for doing in like
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# is that if you aren't running BIDIR, and you are running faxd, clocal
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# doesn't get turned on from pppd so chat will never work if you exec
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# it from within pppd. I found that I needed to run uucp with the
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# HAVE_CLOCAL_BUG flag set to 1 in order to get it to work in conjunction
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# with faxd. Anyway, this setup seem to work.
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(
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stty $DEVICESPEED -tostop hupcl 2> /dev/null
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# <LOCAL> Modify the Modem initialization strings to be whatever works for you
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if chat -v ABORT "NO CARRIER" ABORT BUSY "" ATZ0E1 OK ATS50=255DT$PHONE \
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CONNECT "" ogin: $USER ssword: \\q$PASSWORD
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then
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# We got connected.
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/usr/libexec/pppd $DEBUG $OPTIONS -detach modem defaultroute \
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crtscts $NETMASK $DEVICE $DEVICESPEED $IP_ADDR
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else
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echo "PPP call failed" 1>&2
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exit 1
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fi
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) < /dev/$DEVICE > /dev/$DEVICE
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# Get the return code from the subshell.
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RC=$?
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# Clear the lock. Slight window here where someone could detect that
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# pppd is no longer running, remove its lock file and create its own.
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# How to fix??
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rm -f $LOCKFILE
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#Pass on the exit code.
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exit $RC
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5
usr.bin/chat/ppp-off
Executable file
5
usr.bin/chat/ppp-off
Executable file
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#!/bin/sh
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kill -INT `ps -ax | egrep " ppp " | egrep -v "egrep" | sed 's/^\([ 0-9]*\) .*/\1'/`
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exit 0
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37
usr.bin/chat/ppp-on
Executable file
37
usr.bin/chat/ppp-on
Executable file
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#!/bin/sh
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#
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# ppp-on
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#
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# Set up a PPP link
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#
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LOCKDIR=/var/spool/lock
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DEVICE=com1
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PHONE=4511234
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USER=Pkarl
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PASSWORD=password
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OUR_IP_ADDR=137.175.6.3
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if [ -f $LOCKDIR/LCK..$DEVICE ]
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then
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echo "PPP device is locked"
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exit 1
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fi
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fix-cua $DEVICE
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(
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stty 19200 -tostop
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if chat -l LCK..$DEVICE ABORT "NO CARRIER" ABORT BUSY "" ATZ OK ATs50=255s111=0DT$PHONE CONNECT "" ogin: $USER ssword: \\q$PASSWORD
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then
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ppp mru 1500 $OUR_IP_ADDR: /dev/$DEVICE &
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sleep 10
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exit 0
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else
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echo "PPP call failed" 1>&2
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exit 1
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fi
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) < /dev/$DEVICE > /dev/$DEVICE
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23
usr.bin/chat/unlock
Executable file
23
usr.bin/chat/unlock
Executable file
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#!/bin/sh
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LOCKDIR=/var/spool/lock
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case "$1" in
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"") echo "Usage: unlock lockfile"; exit 1 ;;
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.*) echo "Usage: unlock lockfile"; exit 1 ;;
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esac
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if [ -f $LOCKDIR/$1 ]
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then
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if [ `wc -c < $LOCKDIR/$1` -eq 4 ]
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then
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rm -f $LOCKDIR/$1
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exit 0
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else
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echo "Usage: unlock lockfile"
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exit 1
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fi
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else
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echo "lockfile" $LOCKDIR/$1 "does not exist"
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exit 1
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fi
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Block a user