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