licpcsc pcscd communication

libpcsc pcscd communication

1.0 Connection sequence

When an application is started that uses the lipcsc library, the connection sequence is started to connect the application to pcscd. Here is the connection sequence.

libpcsc		pcscd
CMD_VERSION with header	>>	CMD_VERSION with header
CMD_VERSION	<<	CMD_VERSION

1.1 Message Header The header is attached before all messages going from libpcsc to pcscd. The header includes.

type	description
UINT32	Size - Message bytes
UINT32	Command - Message command see 1.3

1.2 Environment variables

The environment variable PCSCLITE_CSOCK_NAME is used to tell the pcsc library what unix domain socket to connect to.

example export PCSCLITE_CSOCK_NAME=/tmp/pcsc_test pcsc_scan

The will cause pcsc_scan to try to connect to /tmp/pcsc_test through the libpcsclite library.

1.3 List of commands

command	hex	source
SCARD_ESTABLISH_CONTEXT	0x01	SCardEstablishContext()
SCARD_RELEASE_CONTEXT	0x02	SCardReleaseContext()
SCARD_LIST_READERS	0x03	SCardListReaders()
SCARD_CONNECT	0x04	SCardConnect()
SCARD_RECONNECT	0x05	SCardReconnect()
SCARD_DISCONNECT	0x06	SCardDisconnect()
SCARD_BEGIN_TRANSACTION	0x07	SCardBeginTransaction()
SCARD_END_TRANSACTION	0x08	SCardEndTransaction()
SCARD_TRANSMIT	0x09	SCardTransmit()
SCARD_CONTROL	0x0A	SCardControl()
SCARD_STATUS	0x0B	SCardStatus()
SCARD_GET_STATUS_CHANGE	0x0C	Not used
SCARD_CANCEL	0x0D	SCardCancel()
SCARD_CANCEL_TRANSACTION	0x0E	Not used
SCARD_GET_ATTRIB	0x0F	SCardGetAttrib()
SCARD_SET_ATTRIB	0x10
CMD_VERSION	0x11
CMD_GET_READERS_STATE	0x12
CMD_WAIT_READER_STATE_CHANGE	0x13
CMD_STOP_WAITING_READER_STATE_CHANGE	0x14

CMD_VERSION

name	size
major	UINT32
minor	UINT32