src/wps/wps_nfc.c

   1 /*
   2  * NFC routines for Wi-Fi Protected Setup
   3  * Copyright (c) 2009-2012, Masashi Honma <masashi.honma@gmail.com>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10 #include "common.h"
  11
  12 #include "wps/wps.h"
  13 #include "wps_i.h"
  14
  15
  16 struct wps_nfc_data {
  17         struct oob_nfc_device_data *oob_nfc_dev;
  18 };
  19
  20
  21 static void * init_nfc(struct wps_context *wps,
  22                        struct oob_device_data *oob_dev, int registrar)
  23 {
  24         struct oob_nfc_device_data *oob_nfc_dev;
  25         struct wps_nfc_data *data;
  26
  27         oob_nfc_dev = wps_get_oob_nfc_device(oob_dev->device_name);
  28         if (oob_nfc_dev == NULL) {
  29                 wpa_printf(MSG_ERROR, "WPS (NFC): Unknown NFC device (%s)",
  30                            oob_dev->device_name);
  31                 return NULL;
  32         }
  33
  34         if (oob_nfc_dev->init_func(oob_dev->device_path) < 0)
  35                 return NULL;
  36
  37         data = os_zalloc(sizeof(*data));
  38         if (data == NULL) {
  39                 wpa_printf(MSG_ERROR, "WPS (NFC): Failed to allocate "
  40                            "nfc data area");
  41                 return NULL;
  42         }
  43         data->oob_nfc_dev = oob_nfc_dev;
  44         return data;
  45 }
  46
  47
  48 static struct wpabuf * read_nfc(void *priv)
  49 {
  50         struct wps_nfc_data *data = priv;
  51         struct wpabuf *wifi, *buf;
  52         char *raw_data;
  53         size_t len;
  54
  55         raw_data = data->oob_nfc_dev->read_func(&len);
  56         if (raw_data == NULL)
  57                 return NULL;
  58
  59         wifi = wpabuf_alloc_copy(raw_data, len);
  60         os_free(raw_data);
  61         if (wifi == NULL) {
  62                 wpa_printf(MSG_ERROR, "WPS (NFC): Failed to allocate "
  63                            "nfc read area");
  64                 return NULL;
  65         }
  66
  67         buf = ndef_parse_wifi(wifi);
  68         wpabuf_free(wifi);
  69         if (buf == NULL)
  70                 wpa_printf(MSG_ERROR, "WPS (NFC): Failed to unwrap");
  71         return buf;
  72 }
  73
  74
  75 static int write_nfc(void *priv, struct wpabuf *buf)
  76 {
  77         struct wps_nfc_data *data = priv;
  78         struct wpabuf *wifi;
  79         int ret;
  80
  81         wifi = ndef_build_wifi(buf);
  82         if (wifi == NULL) {
  83                 wpa_printf(MSG_ERROR, "WPS (NFC): Failed to wrap");
  84                 return -1;
  85         }
  86
  87         ret = data->oob_nfc_dev->write_func(wpabuf_mhead(wifi),
  88                                             wpabuf_len(wifi));
  89         wpabuf_free(wifi);
  90         return ret;
  91 }
  92
  93
  94 static void deinit_nfc(void *priv)
  95 {
  96         struct wps_nfc_data *data = priv;
  97
  98         data->oob_nfc_dev->deinit_func();
  99
 100         os_free(data);
 101 }
 102
 103
 104 struct oob_device_data oob_nfc_device_data = {
 105         .device_name    = NULL,
 106         .device_path    = NULL,
 107         .init_func      = init_nfc,
 108         .read_func      = read_nfc,
 109         .write_func     = write_nfc,
 110         .deinit_func    = deinit_nfc,
 111 };