www.project-moonshot.org Git - mech_eap.orig/blob - libeap/src/wps/wps_ufd.c

   1 /*
   2  * UFD routines for Wi-Fi Protected Setup
   3  * Copyright (c) 2009, Masashi Honma <honma@ictec.co.jp>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16 #include "common.h"
  17 #include <sys/types.h>
  18 #include <sys/stat.h>
  19 #include <sys/wait.h>
  20 #include <fcntl.h>
  21 #include <dirent.h>
  22
  23 #include "wps/wps.h"
  24 #include "wps/wps_i.h"
  25
  26 #ifdef CONFIG_NATIVE_WINDOWS
  27 #define UFD_DIR1 "%s\\SMRTNTKY"
  28 #define UFD_DIR2 UFD_DIR1 "\\WFAWSC"
  29 #define UFD_FILE UFD_DIR2 "\\%s"
  30 #else /* CONFIG_NATIVE_WINDOWS */
  31 #define UFD_DIR1 "%s/SMRTNTKY"
  32 #define UFD_DIR2 UFD_DIR1 "/WFAWSC"
  33 #define UFD_FILE UFD_DIR2 "/%s"
  34 #endif /* CONFIG_NATIVE_WINDOWS */
  35
  36
  37 struct wps_ufd_data {
  38         int ufd_fd;
  39 };
  40
  41
  42 static int dev_pwd_e_file_filter(const struct dirent *entry)
  43 {
  44         unsigned int prefix;
  45         char ext[5];
  46
  47         if (sscanf(entry->d_name, "%8x.%4s", &prefix, ext) != 2)
  48                 return 0;
  49         if (prefix == 0)
  50                 return 0;
  51         if (os_strcasecmp(ext, "WFA") != 0)
  52                 return 0;
  53
  54         return 1;
  55 }
  56
  57
  58 static int wps_get_dev_pwd_e_file_name(char *path, char *file_name)
  59 {
  60         struct dirent **namelist;
  61         int i, file_num;
  62
  63         file_num = scandir(path, &namelist, &dev_pwd_e_file_filter,
  64                            alphasort);
  65         if (file_num < 0) {
  66                 wpa_printf(MSG_ERROR, "WPS: OOB file not found: %d (%s)",
  67                            errno, strerror(errno));
  68                 return -1;
  69         }
  70         if (file_num == 0) {
  71                 wpa_printf(MSG_ERROR, "WPS: OOB file not found");
  72                 os_free(namelist);
  73                 return -1;
  74         }
  75         os_strlcpy(file_name, namelist[0]->d_name, 13);
  76         for (i = 0; i < file_num; i++)
  77                 os_free(namelist[i]);
  78         os_free(namelist);
  79         return 0;
  80 }
  81
  82
  83 static int get_file_name(struct wps_context *wps, int registrar,
  84                          const char *path, char *file_name)
  85 {
  86         switch (wps->oob_conf.oob_method) {
  87         case OOB_METHOD_CRED:
  88                 os_snprintf(file_name, 13, "00000000.WSC");
  89                 break;
  90         case OOB_METHOD_DEV_PWD_E:
  91                 if (registrar) {
  92                         char temp[128];
  93                         os_snprintf(temp, sizeof(temp), UFD_DIR2, path);
  94                         if (wps_get_dev_pwd_e_file_name(temp, file_name) < 0)
  95                                 return -1;
  96                 } else {
  97                         u8 *mac_addr = wps->dev.mac_addr;
  98
  99                         os_snprintf(file_name, 13, "%02X%02X%02X%02X.WFA",
 100                                     mac_addr[2], mac_addr[3], mac_addr[4],
 101                                     mac_addr[5]);
 102                 }
 103                 break;
 104         case OOB_METHOD_DEV_PWD_R:
 105                 os_snprintf(file_name, 13, "00000000.WFA");
 106                 break;
 107         default:
 108                 wpa_printf(MSG_ERROR, "WPS: Invalid USBA OOB method");
 109                 return -1;
 110         }
 111         return 0;
 112 }
 113
 114
 115 static int ufd_mkdir(const char *path)
 116 {
 117         if (mkdir(path, S_IRWXU) < 0 && errno != EEXIST) {
 118                 wpa_printf(MSG_ERROR, "WPS (UFD): Failed to create directory "
 119                            "'%s': %d (%s)", path, errno, strerror(errno));
 120                 return -1;
 121         }
 122         return 0;
 123 }
 124
 125
 126 static void * init_ufd(struct wps_context *wps,
 127                        struct oob_device_data *oob_dev, int registrar)
 128 {
 129         int write_f;
 130         char temp[128];
 131         char *path = oob_dev->device_path;
 132         char filename[13];
 133         struct wps_ufd_data *data;
 134         int ufd_fd;
 135
 136         if (path == NULL)
 137                 return NULL;
 138
 139         write_f = wps->oob_conf.oob_method == OOB_METHOD_DEV_PWD_E ?
 140                 !registrar : registrar;
 141
 142         if (get_file_name(wps, registrar, path, filename) < 0) {
 143                 wpa_printf(MSG_ERROR, "WPS (UFD): Failed to get file name");
 144                 return NULL;
 145         }
 146
 147         if (write_f) {
 148                 os_snprintf(temp, sizeof(temp), UFD_DIR1, path);
 149                 if (ufd_mkdir(temp))
 150                         return NULL;
 151                 os_snprintf(temp, sizeof(temp), UFD_DIR2, path);
 152                 if (ufd_mkdir(temp))
 153                         return NULL;
 154         }
 155
 156         os_snprintf(temp, sizeof(temp), UFD_FILE, path, filename);
 157         if (write_f)
 158                 ufd_fd = open(temp, O_WRONLY | O_CREAT | O_TRUNC,
 159                               S_IRUSR | S_IWUSR);
 160         else
 161                 ufd_fd = open(temp, O_RDONLY);
 162         if (ufd_fd < 0) {
 163                 wpa_printf(MSG_ERROR, "WPS (UFD): Failed to open %s: %s",
 164                            temp, strerror(errno));
 165                 return NULL;
 166         }
 167
 168         data = os_zalloc(sizeof(*data));
 169         if (data == NULL)
 170                 return NULL;
 171         data->ufd_fd = ufd_fd;
 172         return data;
 173 }
 174
 175
 176 static struct wpabuf * read_ufd(void *priv)
 177 {
 178         struct wps_ufd_data *data = priv;
 179         struct wpabuf *buf;
 180         struct stat s;
 181         size_t file_size;
 182
 183         if (fstat(data->ufd_fd, &s) < 0) {
 184                 wpa_printf(MSG_ERROR, "WPS (UFD): Failed to get file size");
 185                 return NULL;
 186         }
 187
 188         file_size = s.st_size;
 189         buf = wpabuf_alloc(file_size);
 190         if (buf == NULL) {
 191                 wpa_printf(MSG_ERROR, "WPS (UFD): Failed to alloc read "
 192                            "buffer");
 193                 return NULL;
 194         }
 195
 196         if (read(data->ufd_fd, wpabuf_mhead(buf), file_size) !=
 197             (int) file_size) {
 198                 wpabuf_free(buf);
 199                 wpa_printf(MSG_ERROR, "WPS (UFD): Failed to read");
 200                 return NULL;
 201         }
 202         wpabuf_put(buf, file_size);
 203         return buf;
 204 }
 205
 206
 207 static int write_ufd(void *priv, struct wpabuf *buf)
 208 {
 209         struct wps_ufd_data *data = priv;
 210
 211         if (write(data->ufd_fd, wpabuf_mhead(buf), wpabuf_len(buf)) !=
 212             (int) wpabuf_len(buf)) {
 213                 wpa_printf(MSG_ERROR, "WPS (UFD): Failed to write");
 214                 return -1;
 215         }
 216         return 0;
 217 }
 218
 219
 220 static void deinit_ufd(void *priv)
 221 {
 222         struct wps_ufd_data *data = priv;
 223         close(data->ufd_fd);
 224         os_free(data);
 225 }
 226
 227
 228 struct oob_device_data oob_ufd_device_data = {
 229         .device_name    = NULL,
 230         .device_path    = NULL,
 231         .init_func      = init_ufd,
 232         .read_func      = read_ufd,
 233         .write_func     = write_ufd,
 234         .deinit_func    = deinit_ufd,
 235 };