ccid/src/ccid_serial.c

/*
 * ccid_serial.c: communicate with a GemPC Twin smart card reader
 * Copyright (C) 2001-2004 Ludovic Rousseau <ludovic.rousseau@free.fr>
 *
 * Thanks to Niki W. Waibel <niki.waibel@gmx.net> for a prototype version
 * 
 * This program is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along 
 * with this program; if not, write to the Free Software Foundation, Inc., 
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
 */

/*
 * $Id$
 */

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#include <string.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include <PCSC/ifdhandler.h>

#include "defs.h"
#include "ccid_ifdhandler.h"
#include "config.h"
#include "debug.h"
#include "ccid.h"
#include "utils.h"
#include "commands.h"

/* communication timeout in seconds
 * the value is set at the end of OpenSerialByName() */
int SerialTimeout;

#define SYNC 0x03
#define CTRL_ACK 0x06
#define CTRL_NAK 0x15
#define RDR_to_PC_NotifySlotChange 0x50
#define CARD_ABSENT 0x02
#define CARD_PRESENT 0x03

/*
 * normal command:
 * 1 : SYNC
 * 1 : CTRL
 * 10 +data length : CCID command
 * 1 : LRC
 *
 * SYNC : 0x03
 * CTRL : ACK (0x06) or NAK (0x15)
 * CCID command : see USB CCID specs
 * LRC : xor of all the previous byes
 *
 * Error message:
 * 1 : SYNC (0x03)
 * 1 : CTRL (NAK: 0x15)
 * 1 : LRC (0x16)
 *
 * Card insertion/withdrawal
 * 1 : RDR_to_PC_NotifySlotChange (0x50)
 * 1 : bmSlotIccState
 *     0x02 if card absent
 *     0x03 is card present
 *
 * Time request
 * T=1 : normal CCID command
 * T=0 : 1 byte (value between 0x80 and 0xFF)
 *
 */

/*
 * You may get read timeout after a card movement.
 * This is because you will get the echo of the CCID command
 * but not the result of the command.
 *
 * This is not an applicative issue since the card is either removed (and
 * powered off) or just inserted (and not yet powered on).
 */

/* 271 = max size for short APDU
 * 2 bytes for header
 * 1 byte checksum
 * doubled for echo
 */
#define GEMPCTWIN_MAXBUF (271 +2 +1) * 2

typedef struct
{
        /*
         * File handle on the serial port
         */
        int fd;

        /*
         * device used ("/dev/ttyS?" under Linux)
         */
        /*@null@*/ char *device;

        /*
         * serial communication buffer
         */
        unsigned char buffer[GEMPCTWIN_MAXBUF];

        /*
         * next available byte
         */
        int buffer_offset;

        /*
         * number of available bytes
         */
        int buffer_offset_last;

        /*
         * CCID infos common to USB and serial
         */
        _ccid_descriptor ccid;

} _serialDevice;

/* The _serialDevice structure must be defined before including ccid_serial.h */
#include "ccid_serial.h"

/* no need to initialize to 0 since it is static */
static _serialDevice serialDevice[CCID_DRIVER_MAX_READERS];

/* unexported functions */
static int ReadChunk(unsigned int reader_index, unsigned char *buffer,
        int buffer_length, int min_length);

static int get_bytes(unsigned int reader_index, unsigned char *buffer,
        int length);


/*****************************************************************************
 * 
 *                              WriteSerial: Send bytes to the card reader
 *
 *****************************************************************************/
status_t WriteSerial(unsigned int reader_index, unsigned int length,
        unsigned char *buffer)
{
        int i;
        unsigned char lrc;
        unsigned char low_level_buffer[GEMPCTWIN_MAXBUF];

#ifdef DEBUG_LEVEL_COMM
        char debug_header[] = "-> 123456 ";

        sprintf(debug_header, "-> %06X ", reader_index);
#endif

        if (length > GEMPCTWIN_MAXBUF-3)
        {
                DEBUG_CRITICAL3("command too long: %d for max %d",
                        length, GEMPCTWIN_MAXBUF-3);
                return STATUS_UNSUCCESSFUL;
        }

        /* header */
        low_level_buffer[0] = 0x03;     /* SYNC */
        low_level_buffer[1] = 0x06;     /* ACK */

        /* CCID command */
        memcpy(low_level_buffer+2, buffer, length);

        /* checksum */
        lrc = 0;
        for(i=0; i<length+2; i++)
                lrc ^= low_level_buffer[i];
        low_level_buffer[length+2] = lrc;

#ifdef DEBUG_LEVEL_COMM
        DEBUG_XXD(debug_header, low_level_buffer, length+3);
#endif

        if (write(serialDevice[reader_index].fd, low_level_buffer,
                length+3) != length+3)
        {
                DEBUG_CRITICAL2("write error: %s", strerror(errno));
                return STATUS_UNSUCCESSFUL;
        }

        return STATUS_SUCCESS;
} /* WriteSerial */


/*****************************************************************************
 * 
 *                              ReadSerial: Receive bytes from the card reader
 *
 *****************************************************************************/
status_t ReadSerial(unsigned int reader_index,
        /*@unused@*/ unsigned int *length, unsigned char *buffer)
{
        unsigned char c;
        int rv;
        int echo;
        int to_read;
        int i;

        /* we get the echo first */
        echo = TRUE;

start:
        DEBUG_COMM("start");
        if ((rv = get_bytes(reader_index, &c, 1)) != STATUS_SUCCESS)
                return rv;

        if (c == RDR_to_PC_NotifySlotChange)
                goto slot_change;

        if (c == SYNC)
                goto sync;

        if (c >= 0x80)
        {       
                DEBUG_COMM2("time request: 0x%02X", c);
                goto start;
        }

        DEBUG_CRITICAL2("Got 0x%02X", c);
        return STATUS_COMM_ERROR;

slot_change:
        DEBUG_COMM("slot change");
        if ((rv = get_bytes(reader_index, &c, 1)) != STATUS_SUCCESS)
                return rv;

        if (c == CARD_ABSENT)
        {
                DEBUG_COMM("Card removed");
        }
        else
                if (c == CARD_PRESENT)
                {
                        DEBUG_COMM("Card inserted");
                }
                else
                {
                        DEBUG_COMM2("Unknown card movement: %d", c);
                }
        goto start;

sync:
        DEBUG_COMM("sync");
        if ((rv = get_bytes(reader_index, &c, 1)) != STATUS_SUCCESS)
                return rv;

        if (c == CTRL_ACK)
                goto ack;

        if (c == CTRL_NAK)
                goto nak;

        DEBUG_CRITICAL2("Got 0x%02X instead of ACK/NAK", c);
        return STATUS_COMM_ERROR;

nak:
        DEBUG_COMM("nak");
        if ((rv = get_bytes(reader_index, &c, 1)) != STATUS_SUCCESS)
                return rv;

        if (c != (SYNC ^ CTRL_NAK))
        {
                DEBUG_CRITICAL2("Wrong LRC: 0x%02X", c);
                return STATUS_COMM_ERROR;
        }
        else
                goto start;

ack:
        DEBUG_COMM("ack");
        /* normal CCID frame */
        if ((rv = get_bytes(reader_index, buffer, 5)) != STATUS_SUCCESS)
                return rv;

        /* total frame size */
        to_read = 10+dw2i(buffer, 1);

        DEBUG_COMM2("frame size: %d", to_read);
        if ((rv = get_bytes(reader_index, buffer+5, to_read-5)) != STATUS_SUCCESS)
                return rv;

#ifdef DEBUG_LEVEL_COMM
                DEBUG_XXD("frame: ", buffer, to_read);
#endif

        /* lrc */
        DEBUG_COMM("lrc");
        if ((rv = get_bytes(reader_index, &c, 1)) != STATUS_SUCCESS)
                return rv;

        DEBUG_COMM2("lrc: 0x%02X", c);
        for (i=0; i<to_read; i++)
                c ^= buffer[i];

        if (c != (SYNC ^ CTRL_ACK))
                DEBUG_CRITICAL2("Wrong LRC: 0x%02X", c);

        if (echo)
        {
                echo = FALSE;
                goto start;
        }

        return STATUS_SUCCESS;
} /* ReadSerial */


/*****************************************************************************
 * 
 *                              get_bytes: get n bytes
 *
 *****************************************************************************/
int get_bytes(unsigned int reader_index, unsigned char *buffer, int length)
{
        int offset = serialDevice[reader_index].buffer_offset;
        int offset_last = serialDevice[reader_index].buffer_offset_last;

        DEBUG_COMM3("available: %d, needed: %d", offset_last-offset,
                length);
        /* enough data are available */
        if (offset + length <= offset_last)
        {
                DEBUG_COMM("data available");
                memcpy(buffer, serialDevice[reader_index].buffer + offset, length);
                serialDevice[reader_index].buffer_offset += length;
        }
        else
        {
                int present, rv;

                /* copy available data */
                present = offset_last - offset;

                if (present > 0)
                {
                        DEBUG_COMM2("some data available: %d", present);
                        memcpy(buffer, serialDevice[reader_index].buffer + offset,
                                present);
                }

                /* get fresh data */
                DEBUG_COMM2("get more data: %d", length - present);
                rv = ReadChunk(reader_index, serialDevice[reader_index].buffer,
                        sizeof(serialDevice[reader_index].buffer), length - present);
                if (rv < 0)
                        return STATUS_COMM_ERROR;

                /* fill the buffer */
                memcpy(buffer + present, serialDevice[reader_index].buffer,
                        length - present);
                serialDevice[reader_index].buffer_offset = length - present;
                serialDevice[reader_index].buffer_offset_last = rv;
                DEBUG_COMM3("offset: %d, last_offset: %d",
                        serialDevice[reader_index].buffer_offset,
                        serialDevice[reader_index].buffer_offset_last);
        }

        return STATUS_SUCCESS;
} /* get_bytes */


/*****************************************************************************
 * 
 *                              ReadChunk: read a minimum number of bytes
 *
 *****************************************************************************/
static int ReadChunk(unsigned int reader_index, unsigned char *buffer,
        int buffer_length, int min_length)
{
        int fd = serialDevice[reader_index].fd;
# ifndef S_SPLINT_S
        fd_set fdset;
# endif
        struct timeval t;
        int i, rv = 0;
        int already_read;
#ifdef DEBUG_LEVEL_COMM
        char debug_header[] = "<- 123456 ";

        sprintf(debug_header, "<- %06X ", reader_index);
#endif

        already_read = 0;
        while (already_read < min_length)
        {
                /* use select() to, eventually, timeout */
                FD_ZERO(&fdset);
                FD_SET(fd, &fdset);
                t.tv_sec = SerialTimeout;
                t.tv_usec = 0;

                i = select(fd+1, &fdset, NULL, NULL, &t);
                if (i == -1)
                {
                        DEBUG_CRITICAL2("select: %s", strerror(errno));
                        return -1;
                }
                else
                        if (i == 0)
                        {
                                DEBUG_COMM2("Timeout! (%d sec)", SerialTimeout);
                                return -1;
                        }

                rv = read(fd, buffer + already_read, buffer_length - already_read);
                if (rv < 0)
                {
                        DEBUG_COMM2("read error: %s", strerror(errno));
                        return -1;
                }

#ifdef DEBUG_LEVEL_COMM
                DEBUG_XXD(debug_header, buffer + already_read, rv);
#endif

                already_read += rv;
                DEBUG_COMM3("read: %d, to read: %d", already_read,
                        min_length);
        }

        return already_read;
} /* ReadChunk */


/*****************************************************************************
 * 
 *                              OpenSerial: open the port
 *
 *****************************************************************************/
status_t OpenSerial(unsigned int reader_index, int channel)
{
        char dev_name[FILENAME_MAX];

        DEBUG_COMM3("Reader index: %X, Channel: %d", reader_index, channel);

        /*
         * Conversion of old-style ifd-hanler 1.0 CHANNELID 
         */
        if (channel == 0x0103F8)
                channel = 1;
        else
                if (channel == 0x0102F8)
                        channel = 2;
                else
                        if (channel == 0x0103E8)
                                channel = 3;
                        else
                                if (channel == 0x0102E8)
                                        channel = 4;

        if (channel < 0)
        {
                DEBUG_CRITICAL2("wrong port number: %d", (int) channel);
                return STATUS_UNSUCCESSFUL;
        }

        sprintf(dev_name, "/dev/pcsc/%d", (int) channel);

        return OpenSerialByName(reader_index, dev_name);
} /* OpenSerial */

/*****************************************************************************
 * 
 *                              OpenSerialByName: open the port
 *
 *****************************************************************************/
status_t OpenSerialByName(unsigned int reader_index, char *dev_name)
{
        struct termios current_termios;
        int i;
        unsigned int reader = reader_index;

        DEBUG_COMM3("Reader index: %X, Device: %s", reader_index, dev_name);

        /* check if the same channel is not already used */
        for (i=0; i<CCID_DRIVER_MAX_READERS; i++)
        {
                if (serialDevice[i].device &&
                        strcmp(serialDevice[i].device, dev_name) == 0)
                {
                        DEBUG_CRITICAL2("Device %s already in use", dev_name);
                        return STATUS_UNSUCCESSFUL;
                }
        }

        serialDevice[reader].fd = open(dev_name, O_RDWR | O_NOCTTY);

        if (-1 == serialDevice[reader].fd)
        {
                DEBUG_CRITICAL3("open %s: %s", dev_name, strerror(errno));
                return STATUS_UNSUCCESSFUL;
        }

        /* set channel used */
        serialDevice[reader].device = strdup(dev_name);

        /* empty in and out serial buffers */
        if (tcflush(serialDevice[reader].fd, TCIOFLUSH))
                        DEBUG_INFO2("tcflush() function error: %s", strerror(errno));

        /* get config attributes */
        if (tcgetattr(serialDevice[reader].fd, &current_termios) == -1)
        {
                DEBUG_INFO2("tcgetattr() function error: %s", strerror(errno));
                close(serialDevice[reader].fd);
                serialDevice[reader].fd = -1;

                return STATUS_UNSUCCESSFUL;
        }

        /* IGNBRK: ignore BREAK condition on input
         * IGNPAR: ignore framing errors and parity errors. */
        current_termios.c_iflag = IGNBRK | IGNPAR;
        current_termios.c_oflag = 0;    /* Raw output modes */
        /* CS8: 8-bits character size
         * CSTOPB: set two stop bits
         * CREAD: enable receiver
         * CLOCAL: ignore modem control lines */
        current_termios.c_cflag = CS8 | CSTOPB | CREAD | CLOCAL;

        /* Do not echo characters because if you connect to a host it or your modem
         * will echo characters for you.  Don't generate signals. */
        current_termios.c_lflag = 0;

        /* set serial port speed to 115200 bauds */
        cfsetspeed(&current_termios, B115200);

        DEBUG_INFO("Set serial port baudrate to 115200 and correct configuration");
        if (tcsetattr(serialDevice[reader].fd, TCSANOW, &current_termios) == -1)
        {
                close(serialDevice[reader].fd);
                serialDevice[reader].fd = -1;
                DEBUG_INFO2("tcsetattr error: %s", strerror(errno));

                return STATUS_UNSUCCESSFUL;
        }

        serialDevice[reader].ccid.real_bSeq = 0;
        serialDevice[reader].ccid.pbSeq = &serialDevice[reader].ccid.real_bSeq;
        serialDevice[reader].ccid.readerID = GEMPCTWIN;
        serialDevice[reader].ccid.dwMaxCCIDMessageLength = 271;
        serialDevice[reader].ccid.dwMaxIFSD = 254;
        serialDevice[reader].ccid.dwFeatures = 0x00010230;
        serialDevice[reader].ccid.bPINSupport = 0x0;
        serialDevice[reader].ccid.dwDefaultClock = 4000;
        serialDevice[reader].ccid.dwMaxDataRate = 344086;
        serialDevice[reader].ccid.bMaxSlotIndex = 0;
        serialDevice[reader].ccid.bCurrentSlotIndex = 0;

        serialDevice[reader].buffer_offset = 0;
        serialDevice[reader].buffer_offset_last = 0;

        /* perform a command to be sure a GemPC Twin reader is connected
         * get the reader firmware */
        {
                unsigned char tx_buffer[] = "\x02";
                unsigned char rx_buffer[50];
                unsigned int rx_length = sizeof(rx_buffer);

                /* 2 seconds timeout to not wait too long if no reader is connected */
                SerialTimeout = 2;

                if (IFD_SUCCESS != CmdEscape(reader_index, tx_buffer, sizeof(tx_buffer),
                        rx_buffer, &rx_length))
                {
                        DEBUG_CRITICAL("Get firmware failed. Maybe the reader is not connected");
                        return STATUS_UNSUCCESSFUL;
                }

                /* normal timeout: 1 minute to allow long time APDU */
                SerialTimeout = 60;

                rx_buffer[rx_length] = '\0';
                DEBUG_INFO2("Firmware: %s", rx_buffer);
        }

        return STATUS_SUCCESS;
} /* OpenSerialByName */


/*****************************************************************************
 * 
 *                              CloseSerial: close the port
 *
 *****************************************************************************/
status_t CloseSerial(unsigned int reader_index)
{
        unsigned int reader = reader_index;

        close(serialDevice[reader].fd);
        serialDevice[reader].fd = -1;

        free(serialDevice[reader].device);
        serialDevice[reader].device = NULL;

        return STATUS_SUCCESS;
} /* CloseSerial */


/*****************************************************************************
 *
 *                                      get_ccid_descriptor
 *
 ****************************************************************************/
_ccid_descriptor *get_ccid_descriptor(unsigned int reader_index)
{
        return &serialDevice[reader_index].ccid;
} /* get_ccid_descriptor */


1	/*
2	* ccid_serial.c: communicate with a GemPC Twin smart card reader
3	* Copyright (C) 2001-2004 Ludovic Rousseau <ludovic.rousseau@free.fr>
4	*
5	* Thanks to Niki W. Waibel <niki.waibel@gmx.net> for a prototype version
6	*
7	* This program is free software; you can redistribute it and/or modify it
8	* under the terms of the GNU General Public License as published by the
9	* Free Software Foundation; either version 2 of the License, or (at your
10	* option) any later version.
11	*
12	* This program is distributed in the hope that it will be useful, but
13	* WITHOUT ANY WARRANTY; without even the implied warranty of
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15	* General Public License for more details.
16	*
17	* You should have received a copy of the GNU General Public License along
18	* with this program; if not, write to the Free Software Foundation, Inc.,
19	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20	*/
21
22	/*
23	* $Id$
24	*/
25
26	#include <stdio.h>
27	#include <stdlib.h>
28	#include <fcntl.h>
29	#include <unistd.h>
30	#include <termios.h>
31	#include <string.h>
32	#include <errno.h>
33	#include <sys/time.h>
34	#include <sys/types.h>
35	#include <PCSC/ifdhandler.h>
36
37	#include "defs.h"
38	#include "ccid_ifdhandler.h"
39	#include "config.h"
40	#include "debug.h"
41	#include "ccid.h"
42	#include "utils.h"
43	#include "commands.h"
44
45	/* communication timeout in seconds
46	* the value is set at the end of OpenSerialByName() */
47	int SerialTimeout;
48
49	#define SYNC 0x03
50	#define CTRL_ACK 0x06
51	#define CTRL_NAK 0x15
52	#define RDR_to_PC_NotifySlotChange 0x50
53	#define CARD_ABSENT 0x02
54	#define CARD_PRESENT 0x03
55
56	/*
57	* normal command:
58	* 1 : SYNC
59	* 1 : CTRL
60	* 10 +data length : CCID command
61	* 1 : LRC
62	*
63	* SYNC : 0x03
64	* CTRL : ACK (0x06) or NAK (0x15)
65	* CCID command : see USB CCID specs
66	* LRC : xor of all the previous byes
67	*
68	* Error message:
69	* 1 : SYNC (0x03)
70	* 1 : CTRL (NAK: 0x15)
71	* 1 : LRC (0x16)
72	*
73	* Card insertion/withdrawal
74	* 1 : RDR_to_PC_NotifySlotChange (0x50)
75	* 1 : bmSlotIccState
76	* 0x02 if card absent
77	* 0x03 is card present
78	*
79	* Time request
80	* T=1 : normal CCID command
81	* T=0 : 1 byte (value between 0x80 and 0xFF)
82	*
83	*/
84
85	/*
86	* You may get read timeout after a card movement.
87	* This is because you will get the echo of the CCID command
88	* but not the result of the command.
89	*
90	* This is not an applicative issue since the card is either removed (and
91	* powered off) or just inserted (and not yet powered on).
92	*/
93
94	/* 271 = max size for short APDU
95	* 2 bytes for header
96	* 1 byte checksum
97	* doubled for echo
98	*/
99	#define GEMPCTWIN_MAXBUF (271 +2 +1) * 2
100
101	typedef struct
102	{
103	/*
104	* File handle on the serial port
105	*/
106	int fd;
107
108	/*
109	* device used ("/dev/ttyS?" under Linux)
110	*/
111	/@null@/ char *device;
112
113	/*
114	* serial communication buffer
115	*/
116	unsigned char buffer[GEMPCTWIN_MAXBUF];
117
118	/*
119	* next available byte
120	*/
121	int buffer_offset;
122
123	/*
124	* number of available bytes
125	*/
126	int buffer_offset_last;
127
128	/*
129	* CCID infos common to USB and serial
130	*/
131	_ccid_descriptor ccid;
132
133	} _serialDevice;
134
135	/* The _serialDevice structure must be defined before including ccid_serial.h */
136	#include "ccid_serial.h"
137
138	/* no need to initialize to 0 since it is static */
139	static _serialDevice serialDevice[CCID_DRIVER_MAX_READERS];
140
141	/* unexported functions */
142	static int ReadChunk(unsigned int reader_index, unsigned char *buffer,
143	int buffer_length, int min_length);
144
145	static int get_bytes(unsigned int reader_index, unsigned char *buffer,
146	int length);
147
148
149	/*****************************************************************************
150	*
151	* WriteSerial: Send bytes to the card reader
152	*
153	*****************************************************************************/
154	status_t WriteSerial(unsigned int reader_index, unsigned int length,
155	unsigned char *buffer)
156	{
157	int i;
158	unsigned char lrc;
159	unsigned char low_level_buffer[GEMPCTWIN_MAXBUF];
160
161	#ifdef DEBUG_LEVEL_COMM
162	char debug_header[] = "-> 123456 ";
163
164	sprintf(debug_header, "-> %06X ", reader_index);
165	#endif
166
167	if (length > GEMPCTWIN_MAXBUF-3)
168	{
169	DEBUG_CRITICAL3("command too long: %d for max %d",
170	length, GEMPCTWIN_MAXBUF-3);
171	return STATUS_UNSUCCESSFUL;
172	}
173
174	/* header */
175	low_level_buffer[0] = 0x03; /* SYNC */
176	low_level_buffer[1] = 0x06; /* ACK */
177
178	/* CCID command */
179	memcpy(low_level_buffer+2, buffer, length);
180
181	/* checksum */
182	lrc = 0;
183	for(i=0; i<length+2; i++)
184	lrc ^= low_level_buffer[i];
185	low_level_buffer[length+2] = lrc;
186
187	#ifdef DEBUG_LEVEL_COMM
188	DEBUG_XXD(debug_header, low_level_buffer, length+3);
189	#endif
190
191	if (write(serialDevice[reader_index].fd, low_level_buffer,
192	length+3) != length+3)
193	{
194	DEBUG_CRITICAL2("write error: %s", strerror(errno));
195	return STATUS_UNSUCCESSFUL;
196	}
197
198	return STATUS_SUCCESS;
199	} /* WriteSerial */
200
201
202	/*****************************************************************************
203	*
204	* ReadSerial: Receive bytes from the card reader
205	*
206	*****************************************************************************/
207	status_t ReadSerial(unsigned int reader_index,
208	/@unused@/ unsigned int length, unsigned char buffer)
209	{
210	unsigned char c;
211	int rv;
212	int echo;
213	int to_read;
214	int i;
215
216	/* we get the echo first */
217	echo = TRUE;
218
219	start:
220	DEBUG_COMM("start");
221	if ((rv = get_bytes(reader_index, &c, 1)) != STATUS_SUCCESS)
222	return rv;
223
224	if (c == RDR_to_PC_NotifySlotChange)
225	goto slot_change;
226
227	if (c == SYNC)
228	goto sync;
229
230	if (c >= 0x80)
231	{
232	DEBUG_COMM2("time request: 0x%02X", c);
233	goto start;
234	}
235
236	DEBUG_CRITICAL2("Got 0x%02X", c);
237	return STATUS_COMM_ERROR;
238
239	slot_change:
240	DEBUG_COMM("slot change");
241	if ((rv = get_bytes(reader_index, &c, 1)) != STATUS_SUCCESS)
242	return rv;
243
244	if (c == CARD_ABSENT)
245	{
246	DEBUG_COMM("Card removed");
247	}
248	else
249	if (c == CARD_PRESENT)
250	{
251	DEBUG_COMM("Card inserted");
252	}
253	else
254	{
255	DEBUG_COMM2("Unknown card movement: %d", c);
256	}
257	goto start;
258
259	sync:
260	DEBUG_COMM("sync");
261	if ((rv = get_bytes(reader_index, &c, 1)) != STATUS_SUCCESS)
262	return rv;
263
264	if (c == CTRL_ACK)
265	goto ack;
266
267	if (c == CTRL_NAK)
268	goto nak;
269
270	DEBUG_CRITICAL2("Got 0x%02X instead of ACK/NAK", c);
271	return STATUS_COMM_ERROR;
272
273	nak:
274	DEBUG_COMM("nak");
275	if ((rv = get_bytes(reader_index, &c, 1)) != STATUS_SUCCESS)
276	return rv;
277
278	if (c != (SYNC ^ CTRL_NAK))
279	{
280	DEBUG_CRITICAL2("Wrong LRC: 0x%02X", c);
281	return STATUS_COMM_ERROR;
282	}
283	else
284	goto start;
285
286	ack:
287	DEBUG_COMM("ack");
288	/* normal CCID frame */
289	if ((rv = get_bytes(reader_index, buffer, 5)) != STATUS_SUCCESS)
290	return rv;
291
292	/* total frame size */
293	to_read = 10+dw2i(buffer, 1);
294
295	DEBUG_COMM2("frame size: %d", to_read);
296	if ((rv = get_bytes(reader_index, buffer+5, to_read-5)) != STATUS_SUCCESS)
297	return rv;
298
299	#ifdef DEBUG_LEVEL_COMM
300	DEBUG_XXD("frame: ", buffer, to_read);
301	#endif
302
303	/* lrc */
304	DEBUG_COMM("lrc");
305	if ((rv = get_bytes(reader_index, &c, 1)) != STATUS_SUCCESS)
306	return rv;
307
308	DEBUG_COMM2("lrc: 0x%02X", c);
309	for (i=0; i<to_read; i++)
310	c ^= buffer[i];
311
312	if (c != (SYNC ^ CTRL_ACK))
313	DEBUG_CRITICAL2("Wrong LRC: 0x%02X", c);
314
315	if (echo)
316	{
317	echo = FALSE;
318	goto start;
319	}
320
321	return STATUS_SUCCESS;
322	} /* ReadSerial */
323
324
325	/*****************************************************************************
326	*
327	* get_bytes: get n bytes
328	*
329	*****************************************************************************/
330	int get_bytes(unsigned int reader_index, unsigned char *buffer, int length)
331	{
332	int offset = serialDevice[reader_index].buffer_offset;
333	int offset_last = serialDevice[reader_index].buffer_offset_last;
334
335	DEBUG_COMM3("available: %d, needed: %d", offset_last-offset,
336	length);
337	/* enough data are available */
338	if (offset + length <= offset_last)
339	{
340	DEBUG_COMM("data available");
341	memcpy(buffer, serialDevice[reader_index].buffer + offset, length);
342	serialDevice[reader_index].buffer_offset += length;
343	}
344	else
345	{
346	int present, rv;
347
348	/* copy available data */
349	present = offset_last - offset;
350
351	if (present > 0)
352	{
353	DEBUG_COMM2("some data available: %d", present);
354	memcpy(buffer, serialDevice[reader_index].buffer + offset,
355	present);
356	}
357
358	/* get fresh data */
359	DEBUG_COMM2("get more data: %d", length - present);
360	rv = ReadChunk(reader_index, serialDevice[reader_index].buffer,
361	sizeof(serialDevice[reader_index].buffer), length - present);
362	if (rv < 0)
363	return STATUS_COMM_ERROR;
364
365	/* fill the buffer */
366	memcpy(buffer + present, serialDevice[reader_index].buffer,
367	length - present);
368	serialDevice[reader_index].buffer_offset = length - present;
369	serialDevice[reader_index].buffer_offset_last = rv;
370	DEBUG_COMM3("offset: %d, last_offset: %d",
371	serialDevice[reader_index].buffer_offset,
372	serialDevice[reader_index].buffer_offset_last);
373	}
374
375	return STATUS_SUCCESS;
376	} /* get_bytes */
377
378
379	/*****************************************************************************
380	*
381	* ReadChunk: read a minimum number of bytes
382	*
383	*****************************************************************************/
384	static int ReadChunk(unsigned int reader_index, unsigned char *buffer,
385	int buffer_length, int min_length)
386	{
387	int fd = serialDevice[reader_index].fd;
388	# ifndef S_SPLINT_S
389	fd_set fdset;
390	# endif
391	struct timeval t;
392	int i, rv = 0;
393	int already_read;
394	#ifdef DEBUG_LEVEL_COMM
395	char debug_header[] = "<- 123456 ";
396
397	sprintf(debug_header, "<- %06X ", reader_index);
398	#endif
399
400	already_read = 0;
401	while (already_read < min_length)
402	{
403	/* use select() to, eventually, timeout */
404	FD_ZERO(&fdset);
405	FD_SET(fd, &fdset);
406	t.tv_sec = SerialTimeout;
407	t.tv_usec = 0;
408
409	i = select(fd+1, &fdset, NULL, NULL, &t);
410	if (i == -1)
411	{
412	DEBUG_CRITICAL2("select: %s", strerror(errno));
413	return -1;
414	}
415	else
416	if (i == 0)
417	{
418	DEBUG_COMM2("Timeout! (%d sec)", SerialTimeout);
419	return -1;
420	}
421
422	rv = read(fd, buffer + already_read, buffer_length - already_read);
423	if (rv < 0)
424	{
425	DEBUG_COMM2("read error: %s", strerror(errno));
426	return -1;
427	}
428
429	#ifdef DEBUG_LEVEL_COMM
430	DEBUG_XXD(debug_header, buffer + already_read, rv);
431	#endif
432
433	already_read += rv;
434	DEBUG_COMM3("read: %d, to read: %d", already_read,
435	min_length);
436	}
437
438	return already_read;
439	} /* ReadChunk */
440
441
442	/*****************************************************************************
443	*
444	* OpenSerial: open the port
445	*
446	*****************************************************************************/
447	status_t OpenSerial(unsigned int reader_index, int channel)
448	{
449	char dev_name[FILENAME_MAX];
450
451	DEBUG_COMM3("Reader index: %X, Channel: %d", reader_index, channel);
452
453	/*
454	* Conversion of old-style ifd-hanler 1.0 CHANNELID
455	*/
456	if (channel == 0x0103F8)
457	channel = 1;
458	else
459	if (channel == 0x0102F8)
460	channel = 2;
461	else
462	if (channel == 0x0103E8)
463	channel = 3;
464	else
465	if (channel == 0x0102E8)
466	channel = 4;
467
468	if (channel < 0)
469	{
470	DEBUG_CRITICAL2("wrong port number: %d", (int) channel);
471	return STATUS_UNSUCCESSFUL;
472	}
473
474	sprintf(dev_name, "/dev/pcsc/%d", (int) channel);
475
476	return OpenSerialByName(reader_index, dev_name);
477	} /* OpenSerial */
478
479	/*****************************************************************************
480	*
481	* OpenSerialByName: open the port
482	*
483	*****************************************************************************/
484	status_t OpenSerialByName(unsigned int reader_index, char *dev_name)
485	{
486	struct termios current_termios;
487	int i;
488	unsigned int reader = reader_index;
489
490	DEBUG_COMM3("Reader index: %X, Device: %s", reader_index, dev_name);
491
492	/* check if the same channel is not already used */
493	for (i=0; i<CCID_DRIVER_MAX_READERS; i++)
494	{
495	if (serialDevice[i].device &&
496	strcmp(serialDevice[i].device, dev_name) == 0)
497	{
498	DEBUG_CRITICAL2("Device %s already in use", dev_name);
499	return STATUS_UNSUCCESSFUL;
500	}
501	}
502
503	serialDevice[reader].fd = open(dev_name, O_RDWR \| O_NOCTTY);
504
505	if (-1 == serialDevice[reader].fd)
506	{
507	DEBUG_CRITICAL3("open %s: %s", dev_name, strerror(errno));
508	return STATUS_UNSUCCESSFUL;
509	}
510
511	/* set channel used */
512	serialDevice[reader].device = strdup(dev_name);
513
514	/* empty in and out serial buffers */
515	if (tcflush(serialDevice[reader].fd, TCIOFLUSH))
516	DEBUG_INFO2("tcflush() function error: %s", strerror(errno));
517
518	/* get config attributes */
519	if (tcgetattr(serialDevice[reader].fd, &current_termios) == -1)
520	{
521	DEBUG_INFO2("tcgetattr() function error: %s", strerror(errno));
522	close(serialDevice[reader].fd);
523	serialDevice[reader].fd = -1;
524
525	return STATUS_UNSUCCESSFUL;
526	}
527
528	/* IGNBRK: ignore BREAK condition on input
529	* IGNPAR: ignore framing errors and parity errors. */
530	current_termios.c_iflag = IGNBRK \| IGNPAR;
531	current_termios.c_oflag = 0; /* Raw output modes */
532	/* CS8: 8-bits character size
533	* CSTOPB: set two stop bits
534	* CREAD: enable receiver
535	* CLOCAL: ignore modem control lines */
536	current_termios.c_cflag = CS8 \| CSTOPB \| CREAD \| CLOCAL;
537
538	/* Do not echo characters because if you connect to a host it or your modem
539	* will echo characters for you. Don't generate signals. */
540	current_termios.c_lflag = 0;
541
542	/* set serial port speed to 115200 bauds */
543	cfsetspeed(&current_termios, B115200);
544
545	DEBUG_INFO("Set serial port baudrate to 115200 and correct configuration");
546	if (tcsetattr(serialDevice[reader].fd, TCSANOW, &current_termios) == -1)
547	{
548	close(serialDevice[reader].fd);
549	serialDevice[reader].fd = -1;
550	DEBUG_INFO2("tcsetattr error: %s", strerror(errno));
551
552	return STATUS_UNSUCCESSFUL;
553	}
554
555	serialDevice[reader].ccid.real_bSeq = 0;
556	serialDevice[reader].ccid.pbSeq = &serialDevice[reader].ccid.real_bSeq;
557	serialDevice[reader].ccid.readerID = GEMPCTWIN;
558	serialDevice[reader].ccid.dwMaxCCIDMessageLength = 271;
559	serialDevice[reader].ccid.dwMaxIFSD = 254;
560	serialDevice[reader].ccid.dwFeatures = 0x00010230;
561	serialDevice[reader].ccid.bPINSupport = 0x0;
562	serialDevice[reader].ccid.dwDefaultClock = 4000;
563	serialDevice[reader].ccid.dwMaxDataRate = 344086;
564	serialDevice[reader].ccid.bMaxSlotIndex = 0;
565	serialDevice[reader].ccid.bCurrentSlotIndex = 0;
566
567	serialDevice[reader].buffer_offset = 0;
568	serialDevice[reader].buffer_offset_last = 0;
569
570	/* perform a command to be sure a GemPC Twin reader is connected
571	* get the reader firmware */
572	{
573	unsigned char tx_buffer[] = "\x02";
574	unsigned char rx_buffer[50];
575	unsigned int rx_length = sizeof(rx_buffer);
576
577	/* 2 seconds timeout to not wait too long if no reader is connected */
578	SerialTimeout = 2;
579
580	if (IFD_SUCCESS != CmdEscape(reader_index, tx_buffer, sizeof(tx_buffer),
581	rx_buffer, &rx_length))
582	{
583	DEBUG_CRITICAL("Get firmware failed. Maybe the reader is not connected");
584	return STATUS_UNSUCCESSFUL;
585	}
586
587	/* normal timeout: 1 minute to allow long time APDU */
588	SerialTimeout = 60;
589
590	rx_buffer[rx_length] = '\0';
591	DEBUG_INFO2("Firmware: %s", rx_buffer);
592	}
593
594	return STATUS_SUCCESS;
595	} /* OpenSerialByName */
596
597
598	/*****************************************************************************
599	*
600	* CloseSerial: close the port
601	*
602	*****************************************************************************/
603	status_t CloseSerial(unsigned int reader_index)
604	{
605	unsigned int reader = reader_index;
606
607	close(serialDevice[reader].fd);
608	serialDevice[reader].fd = -1;
609
610	free(serialDevice[reader].device);
611	serialDevice[reader].device = NULL;
612
613	return STATUS_SUCCESS;
614	} /* CloseSerial */
615
616
617	/*****************************************************************************
618	*
619	* get_ccid_descriptor
620	*
621	****************************************************************************/
622	_ccid_descriptor *get_ccid_descriptor(unsigned int reader_index)
623	{
624	return &serialDevice[reader_index].ccid;
625	} /* get_ccid_descriptor */
626
627
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svn:keywords	Author Date Id Revision