at, drain, expect, pass - dialer scripting tools dial/at [ -q ] [ -t seconds ] atcommand

dial/expect [ -iq ] [ -t seconds ] goodstring [ badstring ... ]

dial/drain

dial/pass [ -q ]

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 /dev/cons .

At sends atcommand to the modem prefixed with the string at . It then reads from the modem expecting an AT response. At will return success if it gets and OK of CONNECT response. Otherwise it will return the response as an error status. The options are:

-t set the timeout to seconds . The default is 300.

-q don't write to /dev/cons what is read from standard in. The default is to copy everything through.

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:

-t set the timeout to seconds . The default is 300.

-i ignore case when doing the matches.

-q don't write to /dev/cons what is read from standard in. The default is to copy everything through.

Pass copies input from /dev/cons to standard output. It terminates on a newline. The only flag is -q and means the same as it does for expect .

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.

The following rc script dials out through a Hayes compatible modem on /dev/eia1 and lets the user type in a user name and password before starting 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 /rc/bin/ipconf/* example dialer scripts for ppp /sys/src/cmd/dial/*.c ppp (8), telco (4)