.\" Copyright (c) 2001-2003 Maksim Yevmenkin .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" $Id: rfcomm_pppd.8,v 1.7 2003/09/07 18:32:11 max Exp $ .\" .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 dDhS .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 the use of .Xr ppp 8 via an RFCOMM connection. It can operate in two modes: client and server. .Pp In client mode, .Nm opens an RFCOMM connection to the specified server's .Ar BD_ADRR and .Ar channel . Once the RFCOMM connection is established, .Nm executes .Xr ppp 8 in .Fl direct mode with the specified .Ar label . Likewise, .Xr ppp 8 operates over the RFCOMM connection just like it would over a standard serial port, thus allowing a user to .Dq "dial out" and connect to the Internet. .Pp In server mode, .Nm opens an RFCOMM socket and listens for incoming connections from remote clients. Once the new incoming connection is accepted, .Nm forks and executes .Xr ppp 8 in .Fl direct mode with the specified .Ar label . Likewise, .Xr ppp 8 operates over the RFCOMM connection just like it would over a 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 client mode, this required option specifies the address of the remote RFCOMM server. In server mode, this option can be used to specify the local address to listen on. By default, in server mode, the daemon will listen on .Dv ANY address. The address can be specified as BD_ADDR or name. If a name was specified, the .Nm utility will attempt to resolve the name via .Xr bt_gethostbyname 3 . .It Fl C Ar channel In both client and server mode, this required option specifies the RFCOMM channel to connect to or listen on. In server mode, the channel should be a number between 1 and 30. In client mode, the channel could either be a number between 1 and 30 or a service name. Supported service names are: .Cm DUN (Dial-Up Networking) and .Cm LAN (LAN Access Using PPP). If a service name is used instead of a numeric channel number, then .Nm will try to obtain an RFCOMM channel number via SDP (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 D In server mode, register the .Cm DUN (Dial-Up Networking) service in addition to the .Cm LAN (LAN Access Using PPP) service. AT-command exchange can be faked with .Xr ppp 8 chat script. .It Fl h Display usage message and exit. .It Fl l Ar label In both client and server mode, this required option specifies which .Xr ppp 8 label will be used. .It Fl S In server mode, register the .Cm SP (Serial Port) service in addition to the .Cm LAN (LAN Access Using PPP) service. .Pp It appears that some cell phones are using the so-called .Dq "callback mechanism" . In this scenario, the user is trying to connect his cell phone to the Internet, while the 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 .Cm LAN service. Instead, the user's host computer must .Dq "jump start" the phone by connecting to the phone's .Cm 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 the .Cm LAN service, but for whatever reason it looks for the .Cm SP service on the user's host computer. This brain-damaged behavior was reported for the Nokia 6600 and the Sony/Ericsson P900. .It Fl s Act as an RFCOMM server. .It Fl u Ar N This option maps directly to the .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 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, an RFCOMM connection is used as a null-modem connection between a client and a server. Both client and server will start talking PPP right after the RFCOMM connection has been 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 accept dns # 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 .Cm LAN (LAN Access Using PPP) and .Cm DUN (Dial-Up Networking) access. The client's configuration for .Cm LAN access is very similar to the 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 .Cm DUN access is different. In this scenario, the client gets connected to the virtual serial port on the server. To open a PPP session, the 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. An example 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 \\\\dATDT\\\\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 a 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 EXIT STATUS .Ex -std .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 incoming connection has been accepted, .Nm will execute .Xr ppp 8 in .Fl direct mode with the .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, .Nm will execute .Xr ppp 8 in .Fl direct mode with the .Dq Li rfcomm-client label. .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 Mt m_evmenkin@yahoo.com .Sh CAVEATS The .Nm utility in server mode will try to register the Bluetooth LAN Access Over PPP service with the local SDP daemon. If the local SDP daemon is not running, .Nm will exit with an error.