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.TH EXPECT 1
.SH NAME
at, drain, expect, pass \- dialer scripting tools
.SH SYNOPSIS
.B dial/at
[
.B -q
] [
.B -t
.I seconds
]
atcommand
.br
.B dial/expect
[
.B -iq
] [
.B -t
.I seconds
]
.I goodstring
[
.IR badstring ...
]
.br
.B dial/drain
.br
.B dial/pass
[
.B -q
]
.SH DESCRIPTION
These commands are used to write telephone dialing
scripts, mostly for PPP sessions.  They all expect standard input and
output to be connected to a communications device, e.g,
a serial line to a modem.  They communicate with the user using
.BR /dev/cons .
.PP
.I At
sends
.B atcommand
to the modem prefixed with the string
.BR at .
It then reads from the modem expecting an AT response. 
.I At
will return success if it gets and
.B OK
of
.B CONNECT
response.  Otherwise it will return the response as an
error status.  The options are:
.TP
.B -t
set the timeout to
.IR seconds .
The default is 300.
.TP
.B -q
don't write to
.B /dev/cons
what is read from standard in.  The default is
to copy everything through.
.PD
.PP
.I Expect
reads standard input looking for one of the strings given
as arguments.  Reading the first string causes a successul exit
status.  Reading any of the others causes an exit status equal to
the string.  The command also terminates on a timeout.  The options
are:
.TP
.B -t
set the timeout to
.IR seconds .
The default is 300.
.TP
.B -i
ignore case when doing the matches.
.TP
.B -q
don't write to
.B /dev/cons
what is read from standard in.  The default is
to copy everything through.
.PD
.PP
.I Pass
copies input from
.B /dev/cons
to standard output.
It terminates on a newline.  The only flag is
.B -q
and means the same as it does for
.IR expect .
.PP
.I Drain
discards any input waiting on standard input.  It
is used to sync up the stream at the start of dialing
or after an error.
.SH EXAMPLE
The following
.B rc
script dials out through a Hayes compatible modem on
.B /dev/eia1
and lets the user type in a user name and password
before starting
.BR ppp .
.EX
#!/bin/rc
dev=/dev/eia1
telno=18005551212

fn initfn {
        dial/drain
        echo +++
        dial/at zh0
}

fn dialfn {
        dial/drain
        dial/at dt^$telno
}
{
        # set up uart
        if( test -e $dev^ctl ){
                echo -n b^$baud
                echo -n m1      # cts/rts flow control
                echo -n q64000  # big buffer
                echo -n n1      # nonblocking writes
                echo -n r1      # rts on
                echo -n d1      # dtr on
                echo -n c1      # handup when we lose dcd
        } > $dev^ctl

        # get the modem's attention
        while( ! initfn )
                sleep 1

        # dial
        while( ! dialfn )
                sleep 30
                
        if( ! dial/expect -it 60 'username:' ){
                echo can''t connect >[1=2]
                exit connect
        }
        dial/pass
        if( ! dial/expect -it 60 'password:' ){
                echo can''t connect >[1=2]
                exit connect
        }
        dial/pass
        if( ! dial/expect -t 60 'ppp or telnet:' ){
                echo can''t connect >[1=2]
                exit connect
        }
        echo ppp
        dial/expect -t 5 something
        echo connected >[1=2]

        # start ppp
        ip/ppp $primary -f
} < $dev > $dev
.EE
.SH FILES
.B /rc/bin/ipconf/*
example dialer scripts for ppp
.SH SOURCE
.B /sys/src/cmd/dial/*.c
.SH SEE ALSO
.IR ppp (8),
.IR telco (4)