wps_nfc.c

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/*
 * NFC routines for Wi-Fi Protected Setup
 * Copyright (c) 2009, Masashi Honma <honma@ictec.co.jp>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"
#include "common.h"

#include "wps/wps.h"
#include "wps_i.h"


struct wps_nfc_data {
        struct oob_nfc_device_data *oob_nfc_dev;
};


static void * init_nfc(struct wps_context *wps,
                       struct oob_device_data *oob_dev, int registrar)
{
        struct oob_nfc_device_data *oob_nfc_dev;
        struct wps_nfc_data *data;

        oob_nfc_dev = wps_get_oob_nfc_device(oob_dev->device_name);
        if (oob_nfc_dev == NULL) {
                wpa_printf(MSG_ERROR, "WPS (NFC): Unknown NFC device (%s)",
                           oob_dev->device_name);
                return NULL;
        }

        if (oob_nfc_dev->init_func(oob_dev->device_path) < 0)
                return NULL;

        data = os_zalloc(sizeof(*data));
        if (data == NULL) {
                wpa_printf(MSG_ERROR, "WPS (NFC): Failed to allocate "
                           "nfc data area");
                return NULL;
        }
        data->oob_nfc_dev = oob_nfc_dev;
        return data;
}


static struct wpabuf * read_nfc(void *priv)
{
        struct wps_nfc_data *data = priv;
        struct wpabuf *wifi, *buf;
        char *raw_data;
        size_t len;

        raw_data = data->oob_nfc_dev->read_func(&len);
        if (raw_data == NULL)
                return NULL;

        wifi = wpabuf_alloc_copy(raw_data, len);
        os_free(raw_data);
        if (wifi == NULL) {
                wpa_printf(MSG_ERROR, "WPS (NFC): Failed to allocate "
                           "nfc read area");
                return NULL;
        }

        buf = ndef_parse_wifi(wifi);
        wpabuf_free(wifi);
        if (buf == NULL)
                wpa_printf(MSG_ERROR, "WPS (NFC): Failed to unwrap");
        return buf;
}


static int write_nfc(void *priv, struct wpabuf *buf)
{
        struct wps_nfc_data *data = priv;
        struct wpabuf *wifi;
        int ret;

        wifi = ndef_build_wifi(buf);
        if (wifi == NULL) {
                wpa_printf(MSG_ERROR, "WPS (NFC): Failed to wrap");
                return -1;
        }

        ret = data->oob_nfc_dev->write_func(wpabuf_mhead(wifi),
                                            wpabuf_len(wifi));
        wpabuf_free(wifi);
        return ret;
}


static void deinit_nfc(void *priv)
{
        struct wps_nfc_data *data = priv;

        data->oob_nfc_dev->deinit_func();

        os_free(data);
}


struct oob_device_data oob_nfc_device_data = {
        .device_name    = NULL,
        .device_path    = NULL,
        .init_func      = init_nfc,
        .read_func      = read_nfc,
        .write_func     = write_nfc,
        .deinit_func    = deinit_nfc,
};