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Sourcecode: yubikey-personalization version File versions

ykcore_libusb.c

/* -*- mode:C; c-file-style: "bsd" -*- */
/*
 * 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 <usb.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

/*************************************************************************
 **  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)
{
      int rc = usb_claim_interface((usb_dev_handle *)dev, 0);

      if (rc >= 0) {
            int rc2;
            rc = usb_control_msg((usb_dev_handle *)dev,
                             USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_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 = usb_release_interface((usb_dev_handle *)dev, 0);
            if (rc >= 0 && rc2 < 0)
                  rc = rc2;
      }
      if (rc >= 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)
{
      int rc = usb_claim_interface((usb_dev_handle *)dev, 0);

      if (rc >= 0) {
            int rc2;
            rc = usb_control_msg((usb_dev_handle *)dev,
                             USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_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 = usb_release_interface((usb_dev_handle *)dev, 0);
            if (rc >= 0 && rc2 < 0)
                  rc = rc2;
      }
      if (rc >= 0)
            return rc;
      yk_errno = YK_EUSBERR;
      return 0;
}

int _ykusb_start(void)
{
      int rc;
      usb_init();

      rc = usb_find_busses();
      if (rc >= 0)
            rc = usb_find_devices();

      if (rc >= 0)
            return 1;
      yk_errno = YK_EUSBERR;
      return 0;
}

extern int _ykusb_stop(void)
{
      return 1;
}

void *_ykusb_open_device(int vendor_id, int product_id)
{
      struct usb_bus *bus;
      struct usb_device *dev;
      struct usb_dev_handle *h = NULL;
      int rc = YK_EUSBERR;

      for (bus = usb_get_busses(); bus; bus = bus->next) {
            rc = YK_ENOKEY;
            for (dev = bus->devices; dev; dev = dev->next)
                  if (dev->descriptor.idVendor == YUBICO_VID
                      && dev->descriptor.idProduct == YUBIKEY_PID) {
                        rc = YK_EUSBERR;
                        h = usb_open(dev);
                        goto done;
                  }
      }
 done:
      if (h == NULL)
            yk_errno = rc;
      return h;
}

int _ykusb_close_device(void *yk)
{
      int rc = usb_close((usb_dev_handle *) yk);

      if (rc >= 0)
            return 1;
      yk_errno = YK_EUSBERR;
      return 0;
}

const char *_ykusb_strerror()
{
      return usb_strerror();
}

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