ref: bc8c31dbd506731813a62b220ae544f2eb239c5f
dir: /sys/man/1/expect/
.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)