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The (BT)SAP (Bluetooth SIM Access Profile) is a part of Bluetooth
specifications, that defines the protocol and procedures that
shall be used to access a smart card (usually GSM SIM) via
a Bluetooth link.
The profile defines two roles:
- Server - the side that has direct access to a smart card.
It acts as a SIM card reader, which assists the Client
in accessing and controlling the smart card.
- Client - the side that accesses and controls the smart card
inside the Server through the connection with Server.
Typical examples of a Server are a simple SIM card holder or
a portable phone in the car environment. A typical example of
a Client is a car phone, which uses a subscription module in
the Server for a connection to the cellular network.
OsmocomBB implements the Client role providing abstract SAP
interface API to the higher layers. Instead of Bluetooth,
a UNIX socket is used to communicate with a Server.
The previous implementation of (BT)SAP interface was incomplete
and hard to maintain. This change (re)implements it almost from
scratch on top of the Osmocom FSM framework.
Besides that, the most significant changes are:
- The implementation is separated into three parts:
- sap_interface.{c|h} - public SAP interface API,
- sap_proto.{c|h} - SAP protocol definition,
- sap_fsm.{c|h} - SAP FSM implementation.
- Both 'sap_message' and 'sap_param' structures follow the
SAP message format definition according to 5.1 and 5.2.
- The message parsing is done more carefully in order to
prevent buffer overflow and NULL-pointer dereference.
- Introduced public API for getting / adding message
parameters, and checking the ResultCode.
- Introduced public API for opening / closing a connection
with the server, powering on / off and resetting the SIM
card, sending ATR and APDU.
- Introduced a call-back for handling the response message.
- Card reader state is also a part of the public API.
The new implementation was tested against softsim [1]. The
only limitation is Server-initiated Release, that allows the
Server to 'ask' a Client to release connection as soon as
communication with the smart card is finished. This is not
implemented (yet), and leads to immediate release.
[1] https://git.osmocom.org/softsim/
Change-Id: I77bb108615bb2c94c441568f195b04e0a5421643
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Change-Id: Iad9b3d88b02cc7ec4cf64483bbc85e3a61c9ad10
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The 'osmo' prefix is usually used by libosmo-* symbols.
Change-Id: Id37d8553c2f2c20012fb1b729967b92a9a03f612
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Change-Id: I4ba5a8a42bf25d04b152ac3f1f0e4d7eac7f068f
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Change-Id: Ib3aa81986987027718e2a8b461afd28787bda4c2
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Change-Id: I408b3e1fa40e9b5daf88fa6ed5f3930b83dffe6f
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Change-Id: Ie3040c75bb61094b9b601aef9d699db603d292f4
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Change-Id: I98e407c2b6604438d2495700cb62753ad55369ea
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1) Now the SAP interface is selectable as SIM source using the 'sim sap'
command in VTY.
2) SAP connection starts only if it is configured as SIM source.
3) Fixed sap_socket_path configuration r/w errors.
Written-by: Яницкий Ва дим <axilirator@gmail.com>
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
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Patch mostly written by Nico Golde
and some cleanup/testing by Domonkos Tomcsanyi
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
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