RFCOMM_PPPD(8) BSD System Manager's Manual RFCOMM_PPPD(8)
NAME
rfcomm_pppd -- RFCOMM PPP daemon
SYNOPSIS
rfcomm_pppd -c [-dh] -a address -C channel -l label -u N
rfcomm_pppd -s [-dDhS] [-a address] -C channel -l label
DESCRIPTION
The rfcomm_pppd daemon is a simple wrapper daemon that allows the use of ppp(8) via an RFCOMM connection. It can operate in two modes:
client and server.
In client mode, rfcomm_pppd opens an RFCOMM connection to the specified server's BD_ADRR and channel. Once the RFCOMM connection is estab-
lished, rfcomm_pppd executes ppp(8) in -direct mode with the specified label. Likewise, ppp(8) operates over the RFCOMM connection just like
it would over a standard serial port, thus allowing a user to ``dial out'' and connect to the Internet.
In server mode, rfcomm_pppd opens an RFCOMM socket and listens for incoming connections from remote clients. Once the new incoming connec-
tion is accepted, rfcomm_pppd forks and executes ppp(8) in -direct mode with the specified label. Likewise, ppp(8) operates over the RFCOMM
connection just like it would over a standard serial port, thus providing network connectivity to remote clients.
The options are as follows:
-a 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 ANY address. The address can be spec-
ified as BD_ADDR or name. If a name was specified, the rfcomm_pppd utility will attempt to resolve the name via bt_gethostbyname(3).
-C 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: DUN (Dial-Up Networking) and LAN (LAN Access Using PPP). If a service name is used instead of a
numeric channel number, then rfcomm_pppd will try to obtain an RFCOMM channel number via SDP (Service Discovery Protocol).
-c Act as an RFCOMM client. This is the default mode.
-d Do not detach from the controlling terminal, i.e., run in foreground.
-D In server mode, register the DUN (Dial-Up Networking) service in addition to the LAN (LAN Access Using PPP) service. AT-command
exchange can be faked with ppp(8) chat script.
-h Display usage message and exit.
-l label
In both client and server mode, this required option specifies which ppp(8) label will be used.
-S In server mode, register the SP (Serial Port) service in addition to the LAN (LAN Access Using PPP) service.
It appears that some cell phones are using the so-called ``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 LAN service. Instead, the user's host computer must ``jump start'' the phone by con-
necting 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 the 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 the Nokia 6600 and the Sony/Ericsson P900.
-s Act as an RFCOMM server.
-u N This option maps directly to the -unit ppp(8) command-line option and tells rfcomm_pppd to instruct ppp(8) to only attempt to open
/dev/tunN. This option only works in client mode.
PPP CONFIGURATION
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
always execute commands in the ``default'' label of your /etc/ppp/ppp.conf file. Please make sure that the ``default'' label only contains
commands that apply to 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 ``default'' section into an appropriate outgoing label.
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.
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
RFCOMM Client
The rfcomm_pppd utility supports both LAN (LAN Access Using PPP) and DUN (Dial-Up Networking) access. The client's configuration for LAN
access is very similar to the server's and might look like this:
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
The client's configuration for 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 ppp(8) will not execute any configured chat scripts.
The force-scripts option can be used to override this behavior. An example configuration is shown below:
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
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.
EXIT STATUS
The rfcomm_pppd utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
rfcomm_pppd -s -a 00:01:02:03:04:05 -C 1 -l rfcomm-server
This command will start rfcomm_pppd in the server mode. The RFCOMM server will listen on local address 00:01:02:03:04:05 and channel 1.
Once the incoming connection has been accepted, rfcomm_pppd will execute ppp(8) in -direct mode with the ``rfcomm-server'' label.
rfcomm_pppd -c -a 00:01:02:03:04:05 -C 1 -l rfcomm-client
This command will start rfcomm_pppd in the client mode. rfcomm_pppd will try to connect to the RFCOMM server at 00:01:02:03:04:05 address
and channel 1. Once connected, rfcomm_pppd will execute ppp(8) in -direct mode with the ``rfcomm-client'' label.
SEE ALSO
rfcomm_sppd(1), bluetooth(3), ng_btsocket(4), ppp(8), sdpcontrol(8), sdpd(8)
AUTHORS
Maksim Yevmenkin <m_evmenkin@yahoo.com>
CAVEATS
The rfcomm_pppd utility in server mode will try to register the Bluetooth LAN Access Over PPP service with the local SPD daemon. If the
local SDP daemon is not running, rfcomm_pppd will exit with an error.
BSD
February 4, 2003 BSD