freebsd-skq/usr.sbin/bluetooth/rfcomm_pppd/rfcomm_pppd.8

.\" Copyright (c) 2001-2003 Maksim Yevmenkin <m_evmenkin@yahoo.com>
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.\" $Id: rfcomm_pppd.8,v 1.7 2003/09/07 18:32:11 max Exp $
.\" $FreeBSD$
.\"
.Dd February 4, 2003
.Dt RFCOMM_PPPD 8
.Os
.Sh NAME
.Nm rfcomm_pppd
.Nd RFCOMM PPP daemon
.Sh SYNOPSIS
.Nm
.Fl c
.Op Fl dh
.Fl a Ar address
.Fl C Ar channel
.Fl l Ar label
.Fl u Ar N
.Nm
.Fl s
.Op Fl dhS
.Op Fl a Ar address
.Fl C Ar channel
.Fl l Ar label
.Sh DESCRIPTION
The
.Nm
daemon is a simple wrapper daemon that allows to use standard
.Xr ppp 8
on RFCOMM connection.
It can operate in two modes: client and server.
.Pp
In the client mode,
.Nm
opens an RFCOMM connection to the specified server's
.Ar BD_ADRR
and
.Ar channel .
Once RFCOMM connection is established,
.Nm
executes
.Xr ppp 8
in
.Fl direct
mode with the specified
.Ar label .
The
.Xr ppp 8
in its turn operates over the RFCOMM connection just like it would operate
over the standard serial port thus allowing user to
.Dq "dial out"
and connect to the Internet.
.Pp
In the server mode,
.Nm
opens an RFCOMM socket and listens for incomming connections from remote clients.
Once the new incomming connection is accepted,
.Nm
forks and executes
.Xr ppp 8
in
.Fl direct
mode with the specified
.Ar label .
The
.Xr ppp 8
in its turn operates over the RFCOMM connection just like it would operate over
the standard serial port thus providing network connectivity to remote clients.
.Pp
The options are as follows:
.Bl -tag -width indent
.It Fl a Ar address
In the client mode, this required option specifies the address of the remote
RFCOMM server.
In the server mode, this option can be used to specify the local
address to listen on.
By default, server will listen on
.Dv ANY
address.
The address can be specified as BD_ADDR or name.
If name was specified then the
.Nm
utility will attempt to resolve the name via
.Xr bt_gethostbyname 3 .
.It Fl C Ar channel
In both client and server modes, this required option specifies RFCOMM channel
to connect to or listen on.
In the server mode, RFCOMM channel should be a number between 1 and 30.
In the client mode, RFCOMM channel could either be a number between 1 and 30
or a service name.
Supported service names are:
.Cm DUN
(for DialUp Networking service) and
.Cm LAN
(for LAN Access Using PPP service).
If service name was specified instead of numeric RFCOMM channel then
.Nm
utility will try to obtain RFCOMM channel for the service via Service
Discovery Protocol.
.It Fl c
Act as an RFCOMM client.
This is the default mode.
.It Fl d
Do not detach from the controlling terminal, i.e., run in foreground.
.It Fl h
Display usage message and exit.
.It Fl l Ar label
In both client and server modes, this required option specifies which
.Xr ppp 8
label will be used.
.It Fl S
In the server mode register the Serial Port (SP) service in addition to the
LAN Access Using PPP (LAN) service.
It appears that some cell phones are using so called
.Dq callback mechanism .
In this scenario the user is trying to connect his cell phone to the Internet,
and, user's host computer is acting as the gateway server.
It seems that it is not possible to tell the phone to just connect and start
using the LAN service.
Instead the user's host computer must
.Dq jump start
the phone by connecting to the phone's SP service.
What happens next is the phone kills the existing connection and opens another
connection back to the user's host computer.
The phone really wants to use LAN service, but for whatever reason it looks
for the SP service on the user's host computer.
This brain damaged behavior was reported for Nokia 6600 and Sony/Ericsson P900.
.It Fl s
Act as an RFCOMM server.
.It Fl u Ar N
This option maps directly onto
.Fl unit
.Xr ppp 8
command line option and tells
.Nm
to instruct
.Xr ppp 8
to only attempt to open
.Pa /dev/tun Ns Ar N .
This option only works in the client mode.
.El
.Sh PPP CONFIGURATION
.Ss Important Notes on PPP Configuration
Special attention is required when adding new RFCOMM configurations to the
existing PPP configuration.
Please keep in mind that PPP will
.Em always
execute commands in the
.Dq Li default
label of your
.Pa /etc/ppp/ppp.conf
file.
Please make sure that the
.Dq Li default
label
.Em only
contains commands that apply to
.Em every
other label.
If you need to use PPP for both dialing out and accepting incoming
RFCOMM connections, please make sure you have moved all commands related to
dialing out from the
.Dq Li default
section into an appropriate outgoing label.
.Ss RFCOMM Server
One of the typical examples is the LAN access.
In this example, RFCOMM connection
is used as a null-modem connection between client and server.
Both client
and server will start talking PPP right after RFCOMM connection was established.
.Bd -literal -offset indent
rfcomm-server:
 set timeout 0
 set lqrperiod 10
 set ifaddr 10.0.0.1 10.0.0.2 255.255.255.0
 enable lqr
 accept lqr
 # Do not use PPP authentication. Assume that
 # Bluetooth connection was authenticated already
 disable pap
 deny pap
 disable chap
 deny chap
.Ed
.Ss RFCOMM Client
The
.Nm
utility
supports both LAN and DUN (Dial-Up Networking) access.
The client's configuration for the LAN access is very similar to server's and
might look like this.
.Bd -literal -offset indent
rfcomm-client:
 enable lqr
 accept lqr
 set dial
 set timeout 0
 disable iface-alias
 set ifaddr 10.0.0.1/0 10.0.0.2/0 255.255.255.0 0.0.0.0
 # Do not use PPP authentication. Assume that
 # Bluetooth connection was authenticated already
 deny pap
 disable pap
 deny chap
 disable chap
.Ed
.Pp
The client's configuration for the DUN access is different.
In this scenario, the client gets connected to the virtual serial port on the
server.
To open a PPP session, client must dial a number.
Note that by default
.Xr ppp 8
will not execute any configured chat scripts.
The
.Ic force-scripts
option can be used to override this behavior.
The example of such configuration is shown below.
.Bd -literal -offset indent
rfcomm-dialup:
 # This is IMPORTANT option
 enable force-scripts

 # You might want to change these
 set authname
 set authkey
 set phone "*99***1#"

 # You might want to adjust dial string as well
 set dial "ABORT BUSY ABORT NO\\\\sCARRIER TIMEOUT 5 \\
           \\"\\" AT OK-AT-OK ATE1Q0 OK \\\\dATD\\\\T TIMEOUT 40 CONNECT"
 set login
 set timeout 30
 enable dns
 resolv rewrite

 set ifaddr 10.0.0.1/0 10.0.0.2/0 255.255.255.0 0.0.0.0
 add default HISADDR
.Ed
.Pp
Note that by adjusting the initialization string, one can make CSD (Circuit
Switched Data), HSCSD (High Speed Circuit Switched Data) or GPRS (General
Packet Radio Service) connection.
The availability of the particular connection
type depends on the phone model and service plan activated on the phone.
.Sh EXAMPLES
.Dl "rfcomm_pppd -s -a 00:01:02:03:04:05 -C 1 -l rfcomm-server"
.Pp
This command will start
.Nm
in the server mode.
The RFCOMM server will listen on local address
.Li 00:01:02:03:04:05
and channel
.Li 1 .
Once the incomming connection has been accepted,
.Nm
will execute
.Xr ppp 8
in
.Fl direct
mode with
.Dq Li rfcomm-server
label.
.Pp
.Dl "rfcomm_pppd -c -a 00:01:02:03:04:05 -C 1 -l rfcomm-client"
.Pp
This command will start
.Nm
in the client mode.
.Nm
will try to connect to the RFCOMM server at
.Li 00:01:02:03:04:05
address and channel
.Li 1 .
Once connected, the
.Nm
will execute
.Xr ppp 8
in
.Fl direct
mode with
.Dq Li rfcomm-client
label.
.Sh DIAGNOSTICS
.Ex -std
.Sh CAVEAT
The
.Nm
utility in server mode will try to register Bluetooth LAN Access Over PPP
service with local SPD daemon.
If local SDP daemon is not running the
.Nm
utility will exit with error.
.Sh SEE ALSO
.Xr rfcomm_sppd 1 ,
.Xr bluetooth 3 ,
.Xr ng_btsocket 4 ,
.Xr ppp 8 ,
.Xr sdpcontrol 8 ,
.Xr sdpd 8
.Sh AUTHORS
.An Maksim Yevmenkin Aq m_evmenkin@yahoo.com