contrib/wpa_supplicant-0.5.8/config.h

   1 /*
   2  * WPA Supplicant / Configuration file structures
   3  * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
   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 #ifndef CONFIG_H
  16 #define CONFIG_H
  17
  18 #define DEFAULT_EAPOL_VERSION 1
  19 #define DEFAULT_AP_SCAN 1
  20 #define DEFAULT_FAST_REAUTH 1
  21
  22 #include "config_ssid.h"
  23
  24 /**
  25  * struct wpa_config_blob - Named configuration blob
  26  *
  27  * This data structure is used to provide storage for binary objects to store
  28  * abstract information like certificates and private keys inlined with the
  29  * configuration data.
  30  */
  31 struct wpa_config_blob {
  32         /**
  33          * name - Blob name
  34          */
  35         char *name;
  36
  37         /**
  38          * data - Pointer to binary data
  39          */
  40         u8 *data;
  41
  42         /**
  43          * len - Length of binary data
  44          */
  45         size_t len;
  46
  47         /**
  48          * next - Pointer to next blob in the configuration
  49          */
  50         struct wpa_config_blob *next;
  51 };
  52
  53
  54 /**
  55  * struct wpa_config - wpa_supplicant configuration data
  56  *
  57  * This data structure is presents the per-interface (radio) configuration
  58  * data. In many cases, there is only one struct wpa_config instance, but if
  59  * more than one network interface is being controlled, one instance is used
  60  * for each.
  61  */
  62 struct wpa_config {
  63         /**
  64          * ssid - Head of the global network list
  65          *
  66          * This is the head for the list of all the configured networks.
  67          */
  68         struct wpa_ssid *ssid;
  69
  70         /**
  71          * pssid - Per-priority network lists (in priority order)
  72          */
  73         struct wpa_ssid **pssid;
  74
  75         /**
  76          * num_prio - Number of different priorities used in the pssid lists
  77          *
  78          * This indicates how many per-priority network lists are included in
  79          * pssid.
  80          */
  81         int num_prio;
  82
  83         /**
  84          * eapol_version - IEEE 802.1X/EAPOL version number
  85          *
  86          * wpa_supplicant is implemented based on IEEE Std 802.1X-2004 which
  87          * defines EAPOL version 2. However, there are many APs that do not
  88          * handle the new version number correctly (they seem to drop the
  89          * frames completely). In order to make wpa_supplicant interoperate
  90          * with these APs, the version number is set to 1 by default. This
  91          * configuration value can be used to set it to the new version (2).
  92          */
  93         int eapol_version;
  94
  95         /**
  96          * ap_scan - AP scanning/selection
  97          *
  98          * By default, wpa_supplicant requests driver to perform AP
  99          * scanning and then uses the scan results to select a
 100          * suitable AP. Another alternative is to allow the driver to
 101          * take care of AP scanning and selection and use
 102          * wpa_supplicant just to process EAPOL frames based on IEEE
 103          * 802.11 association information from the driver.
 104          *
 105          * 1: wpa_supplicant initiates scanning and AP selection (default).
 106          *
 107          * 0: Driver takes care of scanning, AP selection, and IEEE 802.11
 108          * association parameters (e.g., WPA IE generation); this mode can
 109          * also be used with non-WPA drivers when using IEEE 802.1X mode;
 110          * do not try to associate with APs (i.e., external program needs
 111          * to control association). This mode must also be used when using
 112          * wired Ethernet drivers.
 113          *
 114          * 2: like 0, but associate with APs using security policy and SSID
 115          * (but not BSSID); this can be used, e.g., with ndiswrapper and NDIS
 116          * drivers to enable operation with hidden SSIDs and optimized roaming;
 117          * in this mode, the network blocks in the configuration are tried
 118          * one by one until the driver reports successful association; each
 119          * network block should have explicit security policy (i.e., only one
 120          * option in the lists) for key_mgmt, pairwise, group, proto variables.
 121          */
 122         int ap_scan;
 123
 124         /**
 125          * ctrl_interface - Parameters for the control interface
 126          *
 127          * If this is specified, %wpa_supplicant will open a control interface
 128          * that is available for external programs to manage %wpa_supplicant.
 129          * The meaning of this string depends on which control interface
 130          * mechanism is used. For all cases, the existance of this parameter
 131          * in configuration is used to determine whether the control interface
 132          * is enabled.
 133          *
 134          * For UNIX domain sockets (default on Linux and BSD): This is a
 135          * directory that will be created for UNIX domain sockets for listening
 136          * to requests from external programs (CLI/GUI, etc.) for status
 137          * information and configuration. The socket file will be named based
 138          * on the interface name, so multiple %wpa_supplicant processes can be
 139          * run at the same time if more than one interface is used.
 140          * /var/run/wpa_supplicant is the recommended directory for sockets and
 141          * by default, wpa_cli will use it when trying to connect with
 142          * %wpa_supplicant.
 143          *
 144          * Access control for the control interface can be configured
 145          * by setting the directory to allow only members of a group
 146          * to use sockets. This way, it is possible to run
 147          * %wpa_supplicant as root (since it needs to change network
 148          * configuration and open raw sockets) and still allow GUI/CLI
 149          * components to be run as non-root users. However, since the
 150          * control interface can be used to change the network
 151          * configuration, this access needs to be protected in many
 152          * cases. By default, %wpa_supplicant is configured to use gid
 153          * 0 (root). If you want to allow non-root users to use the
 154          * control interface, add a new group and change this value to
 155          * match with that group. Add users that should have control
 156          * interface access to this group.
 157          *
 158          * When configuring both the directory and group, use following format:
 159          * DIR=/var/run/wpa_supplicant GROUP=wheel
 160          * DIR=/var/run/wpa_supplicant GROUP=0
 161          * (group can be either group name or gid)
 162          *
 163          * For UDP connections (default on Windows): The value will be ignored.
 164          * This variable is just used to select that the control interface is
 165          * to be created. The value can be set to, e.g., udp
 166          * (ctrl_interface=udp).
 167          *
 168          * For Windows Named Pipe: This value can be used to set the security
 169          * descriptor for controlling access to the control interface. Security
 170          * descriptor can be set using Security Descriptor String Format (see
 171          * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthz/security/security_descriptor_string_format.asp).
 172          * The descriptor string needs to be prefixed with SDDL=. For example,
 173          * ctrl_interface=SDDL=D: would set an empty DACL (which will reject
 174          * all connections).
 175          */
 176         char *ctrl_interface;
 177
 178         /**
 179          * ctrl_interface_group - Control interface group (DEPRECATED)
 180          *
 181          * This variable is only used for backwards compatibility. Group for
 182          * UNIX domain sockets should now be specified using GROUP=<group> in
 183          * ctrl_interface variable.
 184          */
 185         char *ctrl_interface_group;
 186
 187         /**
 188          * fast_reauth - EAP fast re-authentication (session resumption)
 189          *
 190          * By default, fast re-authentication is enabled for all EAP methods
 191          * that support it. This variable can be used to disable fast
 192          * re-authentication (by setting fast_reauth=0). Normally, there is no
 193          * need to disable fast re-authentication.
 194          */
 195         int fast_reauth;
 196
 197         /**
 198          * opensc_engine_path - Path to the OpenSSL engine for opensc
 199          *
 200          * This is an OpenSSL specific configuration option for loading OpenSC
 201          * engine (engine_opensc.so); if %NULL, this engine is not loaded.
 202          */
 203         char *opensc_engine_path;
 204
 205         /**
 206          * pkcs11_engine_path - Path to the OpenSSL engine for PKCS#11
 207          *
 208          * This is an OpenSSL specific configuration option for loading PKCS#11
 209          * engine (engine_pkcs11.so); if %NULL, this engine is not loaded.
 210          */
 211         char *pkcs11_engine_path;
 212
 213         /**
 214          * pkcs11_module_path - Path to the OpenSSL OpenSC/PKCS#11 module
 215          *
 216          * This is an OpenSSL specific configuration option for configuring
 217          * path to OpenSC/PKCS#11 engine (opensc-pkcs11.so); if %NULL, this
 218          * module is not loaded.
 219          */
 220         char *pkcs11_module_path;
 221
 222         /**
 223          * driver_param - Driver interface parameters
 224          *
 225          * This text string is passed to the selected driver interface with the
 226          * optional struct wpa_driver_ops::set_param() handler. This can be
 227          * used to configure driver specific options without having to add new
 228          * driver interface functionality.
 229          */
 230         char *driver_param;
 231
 232         /**
 233          * dot11RSNAConfigPMKLifetime - Maximum lifetime of a PMK
 234          *
 235          * dot11 MIB variable for the maximum lifetime of a PMK in the PMK
 236          * cache (unit: seconds).
 237          */
 238         unsigned int dot11RSNAConfigPMKLifetime;
 239
 240         /**
 241          * dot11RSNAConfigPMKReauthThreshold - PMK re-authentication threshold
 242          *
 243          * dot11 MIB variable for the percentage of the PMK lifetime
 244          * that should expire before an IEEE 802.1X reauthentication occurs.
 245          */
 246         unsigned int dot11RSNAConfigPMKReauthThreshold;
 247
 248         /**
 249          * dot11RSNAConfigSATimeout - Security association timeout
 250          *
 251          * dot11 MIB variable for the maximum time a security association
 252          * shall take to set up (unit: seconds).
 253          */
 254         unsigned int dot11RSNAConfigSATimeout;
 255
 256         /**
 257          * update_config - Is wpa_supplicant allowed to update configuration
 258          *
 259          * This variable control whether wpa_supplicant is allow to re-write
 260          * its configuration with wpa_config_write(). If this is zero,
 261          * configuration data is only changed in memory and the external data
 262          * is not overriden. If this is non-zero, wpa_supplicant will update
 263          * the configuration data (e.g., a file) whenever configuration is
 264          * changed. This update may replace the old configuration which can
 265          * remove comments from it in case of a text file configuration.
 266          */
 267         int update_config;
 268
 269         /**
 270          * blobs - Configuration blobs
 271          */
 272         struct wpa_config_blob *blobs;
 273 };
 274
 275
 276 /* Prototypes for common functions from config.c */
 277
 278 void wpa_config_free(struct wpa_config *ssid);
 279 void wpa_config_free_ssid(struct wpa_ssid *ssid);
 280 struct wpa_ssid * wpa_config_get_network(struct wpa_config *config, int id);
 281 struct wpa_ssid * wpa_config_add_network(struct wpa_config *config);
 282 int wpa_config_remove_network(struct wpa_config *config, int id);
 283 void wpa_config_set_network_defaults(struct wpa_ssid *ssid);
 284 int wpa_config_set(struct wpa_ssid *ssid, const char *var, const char *value,
 285                    int line);
 286 char * wpa_config_get(struct wpa_ssid *ssid, const char *var);
 287 char * wpa_config_get_no_key(struct wpa_ssid *ssid, const char *var);
 288 void wpa_config_update_psk(struct wpa_ssid *ssid);
 289 int wpa_config_add_prio_network(struct wpa_config *config,
 290                                 struct wpa_ssid *ssid);
 291
 292 const struct wpa_config_blob * wpa_config_get_blob(struct wpa_config *config,
 293                                                    const char *name);
 294 void wpa_config_set_blob(struct wpa_config *config,
 295                          struct wpa_config_blob *blob);
 296 void wpa_config_free_blob(struct wpa_config_blob *blob);
 297 int wpa_config_remove_blob(struct wpa_config *config, const char *name);
 298 struct wpa_config * wpa_config_alloc_empty(const char *ctrl_interface,
 299                                            const char *driver_param);
 300 #ifndef CONFIG_NO_STDOUT_DEBUG
 301 void wpa_config_debug_dump_networks(struct wpa_config *config);
 302 #else /* CONFIG_NO_STDOUT_DEBUG */
 303 #define wpa_config_debug_dump_networks(c) do { } while (0)
 304 #endif /* CONFIG_NO_STDOUT_DEBUG */
 305
 306
 307 /* Prototypes for backend specific functions from the selected config_*.c */
 308
 309 /**
 310  * wpa_config_read - Read and parse configuration database
 311  * @name: Name of the configuration (e.g., path and file name for the
 312  * configuration file)
 313  * Returns: Pointer to allocated configuration data or %NULL on failure
 314  *
 315  * This function reads configuration data, parses its contents, and allocates
 316  * data structures needed for storing configuration information. The allocated
 317  * data can be freed with wpa_config_free().
 318  *
 319  * Each configuration backend needs to implement this function.
 320  */
 321 struct wpa_config * wpa_config_read(const char *name);
 322
 323 /**
 324  * wpa_config_write - Write or update configuration data
 325  * @name: Name of the configuration (e.g., path and file name for the
 326  * configuration file)
 327  * @config: Configuration data from wpa_config_read()
 328  * Returns: 0 on success, -1 on failure
 329  *
 330  * This function write all configuration data into an external database (e.g.,
 331  * a text file) in a format that can be read with wpa_config_read(). This can
 332  * be used to allow wpa_supplicant to update its configuration, e.g., when a
 333  * new network is added or a password is changed.
 334  *
 335  * Each configuration backend needs to implement this function.
 336  */
 337 int wpa_config_write(const char *name, struct wpa_config *config);
 338
 339 #endif /* CONFIG_H */