Since uugetty is part of getty_ps you'll first have to install
getty_ps. If you don't have it, get the latest version from
sunsite.unc.edu:/pub/Linux/system/serial. In particular,
if you want to use high speeds (57600 and 115200 bps), you must get
version 2.0.7j or later. You must also have libc 5.x or greater.
By default, getty_ps will be configured to be Linux FSSTND
(File System Standard) compliant, which means
that the binaries will be in /sbin, and the config files
will be named /etc/conf.{uu}getty.ttySN. This is not
apparent from the documentation! It will also expect lock files to go
in /var/lock. Make sure you have the /var/lock
directory.
If you don't want FSSTND compliance, binaries will go
in /etc, config files will go in
/etc/default/{uu}getty.ttySN, and lock files will go in
/usr/spool/uucp. I recommend doing things this way if you
are using UUCP, because UUCP will have problems if you move
the lock files to where it isn't looking for them.
getty_ps can also use syslogd to log messages. See the man
pages for syslogd(1) and syslog.conf(5) for setting up
syslogd, if you don't have it running already. Messages
are logged with priority LOG_AUTH, errors use LOG_ERR, and debugging
uses LOG_DEBUG. If you don't want to use syslogd you
can edit tune.h in the getty_ps source files to use a log
file for messages instead, namely /var/adm/getty.log by
default.
Decide on if you want FSSTND compliance and syslog capability.
You can also choose a combination of the two. Edit the Makefile,
tune.h and config.h to reflect your decisions. Then
compile and install according to the instructions included with the
package.
>From this point on, all references to getty will refer to
getty_ps. References to uugetty will refer to the
uugetty that comes with the getty_ps package. These
instructions will not work for mgetty or agetty.
Make sure that you have an outgoing and incoming device for the
serial port your modem is on. If you have your modem on ttyS3 you will need the /dev/cua3, and /dev/ttyS3 devices. If
you don't have the correct devices, see section
Creating Devices In <tt>/dev</tt> on how to create
devices, and create the devices. If you want to be able to dial out
with your modem while uugetty is watching the port for logins,
use the /dev/cuaN device instead of the
/dev/ttySN device [One wouldn't need cua if the software
was written to avoid it.]
uugetty does important lock file checking. Update
/etc/gettydefs to include an entry for your modem.
When you are done editing /etc/gettydefs, you can verify
that the syntax is correct by doing:
linux# getty -c /etc/gettydefs
If you have a 9600 bps or faster modem with data compression, you can lock your serial port to one speed. For example:
# 115200 fixed speed
F115200# B115200 CS8 # B115200 SANE -ISTRIP HUPCL #@S @L @B login: #F115200
If you have your modem set up to do RTS/CTS hardware flow control, you
can add CRTSCTS to the entries:
# 115200 fixed speed with hardware flow control
F115200# B115200 CS8 CRTSCTS # B115200 SANE -ISTRIP HUPCL CRTSCTS #@S @L @B login: #F115200
If you have a slow modem (under 9600 bps) Then, instead of one line for a single speed, your need several lines to try a number of speeds. Note the these lines are linked to each other by the last "word" in the line such as #38400. Blank lines are needed between each entry.
# Modem entries
115200# B115200 CS8 # B115200 SANE -ISTRIP HUPCL #@S @L @B login: #57600
57600# B57600 CS8 # B57600 SANE -ISTRIP HUPCL #@S @L @B login: #38400
38400# B38400 CS8 # B38400 SANE -ISTRIP HUPCL #@S @L @B login: #19200
19200# B19200 CS8 # B19200 SANE -ISTRIP HUPCL #@S @L @B login: #9600
9600# B9600 CS8 # B9600 SANE -ISTRIP HUPCL #@S @L @B login: #2400
2400# B2400 CS8 # B2400 SANE -ISTRIP HUPCL #@S @L @B login: #115200
If you want, you can make uugetty print interesting things in
the login banner. In Greg's examples, he has the system name, the
serial line, and the current bps rate. You can add other things:
@B The current (evaluated at the time the @B is seen) bps rate.
@D The current date, in MM/DD/YY.
@L The serial line to which getty is attached.
@S The system name.
@T The current time, in HH:MM:SS (24-hour).
@U The number of currently signed-on users. This is a
count of the number of entries in the /etc/utmp file
that have a non-null ut_name field.
@V The value of VERSION, as given in the defaults file.
To display a single '@' character, use either '\@' or '@@'.
There are lots of parameters you can tweak for each port you have.
These are implemented in separate config files for each port.
The file /etc/conf.uugetty will be used by all
instances of uugetty, and /etc/conf.uugetty.ttySN
will only be used by that one port. Sample default config files can
be found with the getty_ps source files, which come with most
Linux distributions. Due to space concerns,
they are not listed here. Note that if you are using older versions
of getty (older than 2.0.7e), or aren't using FSSTND, then the
default file will be /etc/default/uugetty.ttySN. Greg's
/etc/conf.uugetty.ttyS3 looked like this:
# sample uugetty configuration file for a Hayes compatible modem to allow
# incoming modem connections
#
# alternate lock file to check... if this lock file exists, then uugetty is
# restarted so that the modem is re-initialized
ALTLOCK=cua3
ALTLINE=cua3
# line to initialize
INITLINE=cua3
# timeout to disconnect if idle...
TIMEOUT=60
# modem initialization string...
# format: <expect> <send> ... (chat sequence)
INIT="" AT\r OK\r\n
WAITFOR=RING
CONNECT="" ATA\r CONNECT\s\A
# this line sets the time to delay before sending the login banner
DELAY=1
#DEBUG=010
Add the following line to your /etc/inittab, so that
uugetty is run on your serial port (substituting in the
correct information for your environment - config file location,
port, speed, and default terminal type):
S3:456:respawn:/sbin/uugetty -d /etc/default/uugetty.ttyS3 ttyS3 F115200 vt100
init:
linux# init q
/etc/inittab, you want to use
the highest bps rate that your modem supports.
Now Linux will be watching your serial port for connections. Dial in from another machine and login to you Linux system.
uugetty has a lot more options, see the man
page for getty(1m) for a full description. Among other things
there is a scheduling feature, and a ringback feature.