Logo Search packages:      
Sourcecode: yubikey-personalization version File versions

ykcore_libusb-1.0.c

/* -*- mode:C; c-file-style: "bsd" -*- */
/*
 * Copyright (c) 2009, Tollef Fog Heen <tfheen@err.no>
 * Copyright (c) 2008, 2009, Yubico AB
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * 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 COPYRIGHT HOLDERS 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 COPYRIGHT
 * OWNER 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.
 */

#include <libusb.h>
#include <stdio.h>
#include <string.h>

#include "ykcore.h"
#include "ykdef.h"
#include "ykcore_backend.h"

#define HID_GET_REPORT              0x01
#define HID_SET_REPORT              0x09

static int ykl_errno;

/*************************************************************************
 **  function _ykusb_write                                  **
 **  Set HID report                                         **
 **                                                   **
 **  int _ykusb_write(YUBIKEY *yk, int report_type, int report_number,  **
 **               char *buffer, int size)                   **
 **                                                   **
 **  Where:                                           **
 **  "yk" is handle to open Yubikey                         **
 **  "report_type" is HID report type (in, out or feature)        **
 **  "report_number" is report identifier                   **
 **  "buffer" is pointer to in buffer                             **
 **  "size" is size of the buffer                           **
 **                                                   **
 **  Returns: Nonzero if successful, zero otherwise               **
 **                                                   **
 *************************************************************************/

int _ykusb_write(void *dev, int report_type, int report_number,
             char *buffer, int size)
{
      ykl_errno = libusb_claim_interface((libusb_device_handle *)dev, 0);

      if (ykl_errno == 0) {
            int rc2;
            ykl_errno = libusb_control_transfer((libusb_device_handle *)dev,
                                   LIBUSB_REQUEST_TYPE_CLASS |
                                   LIBUSB_RECIPIENT_INTERFACE |
                                   LIBUSB_ENDPOINT_OUT,
                                   HID_SET_REPORT,
                                   report_type << 8 | report_number, 0,
                                   buffer, size,
                                   1000);
            /* preserve a control message error over an interface
               release one */
            rc2 = libusb_release_interface((libusb_device_handle *)dev, 0);
            if (ykl_errno > 0 && rc2 < 0)
                  ykl_errno = rc2;
      }
      if (ykl_errno > 0)
            return 1;
      yk_errno = YK_EUSBERR;
      return 0;
}

/*************************************************************************
**  function _ykusb_read                                    **
**  Get HID report                                          **
**                                                                      **
**  int _ykusb_read(YUBIKEY *dev, int report_type, int report_number,   **
**                 char *buffer, int size)                        **
**                                                                      **
**  Where:                                                              **
**  "dev" is handle to open Yubikey                         **
**  "report_type" is HID report type (in, out or feature)         **
**  "report_number" is report identifier                          **
**  "buffer" is pointer to in buffer                              **
**  "size" is size of the buffer                            **
**                                                    **
**  Returns: Number of bytes read. Zero if failure                **
**                                                                      **
*************************************************************************/

int _ykusb_read(void *dev, int report_type, int report_number,
            char *buffer, int size)
{
      ykl_errno = libusb_claim_interface((libusb_device_handle *)dev, 0);

      if (ykl_errno == 0) {
            int rc2;
            ykl_errno = libusb_control_transfer((libusb_device_handle *)dev,
                                   LIBUSB_REQUEST_TYPE_CLASS |
                                   LIBUSB_RECIPIENT_INTERFACE | 
                                   LIBUSB_ENDPOINT_IN,
                                   HID_GET_REPORT,
                                   report_type << 8 | report_number, 0,
                             buffer, size,
                             1000);
            /* preserve a control message error over an interface
               release one */
            rc2 = libusb_release_interface((libusb_device_handle *)dev, 0);
            if (ykl_errno > 0 && rc2 < 0)
                  ykl_errno = rc2;
      }
      if (ykl_errno > 0)
            return ykl_errno;
      yk_errno = YK_EUSBERR;
      return 0;
}

int _ykusb_start(void)
{
      int rc;
      libusb_init(NULL);
      return 1;
}

extern int _ykusb_stop(void)
{
      libusb_exit(NULL);
      return 1;
}

void *_ykusb_open_device(int vendor_id, int product_id)
{
      libusb_device *dev;
      libusb_device_handle *h = NULL;
      struct libusb_device_descriptor desc;
      libusb_device **list;
      size_t cnt = libusb_get_device_list(NULL, &list);
      size_t i = 0;
      int rc = YK_ENOKEY;

      for (i = 0; i < cnt; i++) {
            dev = list[i];
            ykl_errno = libusb_get_device_descriptor(dev, &desc);
            if (ykl_errno != 0)
                  goto done;

            if (desc.idVendor == YUBICO_VID && desc.idProduct == YUBIKEY_PID) {
                  rc = YK_EUSBERR;
                  ykl_errno = libusb_open(dev, &h);
                  if (ykl_errno != 0)
                        goto done;
                  ykl_errno = libusb_detach_kernel_driver(h, 0);
                  goto done;
            }
      }
 done:
      libusb_free_device_list(list, 1);
      if (h == NULL)
            yk_errno = rc;
      return h;
}

int _ykusb_close_device(void *yk)
{
      libusb_attach_kernel_driver(yk, 0);
      libusb_close((libusb_device_handle *) yk);
      return 1;
}

const char *_ykusb_strerror()
{
      static char *buf;
      switch (ykl_errno) {
      case LIBUSB_SUCCESS:
            buf = "Success (no error)";
            break;
      case LIBUSB_ERROR_IO:
            buf = "Input/output error";
            break;
      case LIBUSB_ERROR_INVALID_PARAM:
            buf = "Invalid parameter";
            break;
      case LIBUSB_ERROR_ACCESS:
            buf = "Access denied (insufficient permissions)";
            break;
      case LIBUSB_ERROR_NO_DEVICE:
            buf = "No such device (it may have been disconnected)";
            break;
      case LIBUSB_ERROR_NOT_FOUND:
            buf = "Entity not found";
            break;
      case LIBUSB_ERROR_BUSY:
            buf = "Resource busy";
            break;
      case LIBUSB_ERROR_TIMEOUT:
            buf = "Operation timed out";
            break;
      case LIBUSB_ERROR_OVERFLOW:
            buf = "Overflow";
            break;
      case LIBUSB_ERROR_PIPE:
            buf = "Pipe error";
            break;
      case LIBUSB_ERROR_INTERRUPTED:
            buf = "System call interrupted (perhaps due to signal)";
            break;
      case LIBUSB_ERROR_NO_MEM:
            buf = "Insufficient memory";
            break;
      case LIBUSB_ERROR_NOT_SUPPORTED:
            buf = "Operation not supported or unimplemented on this platform";
            break;
      case LIBUSB_ERROR_OTHER:
            buf = "Other/unknown error";
            break;
      }
      return buf;
}

Generated by  Doxygen 1.6.0   Back to index