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/*
* wpa_supplicant/hostapd control interface library
* Copyright (c) 2004-2005, Jouni Malinen <jkmaline@cc.hut.fi>
*
* 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.
*/
#ifndef WPA_CTRL_H
#define WPA_CTRL_H
#ifdef __cplusplus
extern "C" {
#endif
/* wpa_supplicant control interface - fixed message prefixes */
/** Interactive request for identity/password/pin */
#define WPA_CTRL_REQ "CTRL-REQ-"
/** Response to identity/password/pin request */
#define WPA_CTRL_RSP "CTRL-RSP-"
/* Event messages with fixed prefix */
/** Authentication completed successfully and data connection enabled */
#define WPA_EVENT_CONNECTED "CTRL-EVENT-CONNECTED "
/** Disconnected, data connection is not available */
#define WPA_EVENT_DISCONNECTED "CTRL-EVENT-DISCONNECTED "
/** wpa_supplicant is exiting */
#define WPA_EVENT_TERMINATING "CTRL-EVENT-TERMINATING "
/** Password change was completed successfully */
#define WPA_EVENT_PASSWORD_CHANGED "CTRL-EVENT-PASSWORD-CHANGED "
/** EAP-Request/Notification received */
#define WPA_EVENT_EAP_NOTIFICATION "CTRL-EVENT-EAP-NOTIFICATION "
/** EAP authentication started (EAP-Request/Identity received) */
#define WPA_EVENT_EAP_STARTED "CTRL-EVENT-EAP-STARTED "
/** EAP method selected */
#define WPA_EVENT_EAP_METHOD "CTRL-EVENT-EAP-METHOD "
/** EAP authentication completed successfully */
#define WPA_EVENT_EAP_SUCCESS "CTRL-EVENT-EAP-SUCCESS "
/** EAP authentication failed (EAP-Failure received) */
#define WPA_EVENT_EAP_FAILURE "CTRL-EVENT-EAP-FAILURE "
/* wpa_supplicant/hostapd control interface access */
/**
* wpa_ctrl_open - Open a control interface to wpa_supplicant/hostapd
* @ctrl_path: Path for UNIX domain sockets; ignored if UDP sockets are used.
* Returns: Pointer to abstract control interface data or %NULL on failure
*
* This function is used to open a control interface to wpa_supplicant/hostapd.
* ctrl_path is usually /var/run/wpa_supplicant or /var/run/hostapd. This path
* is configured in wpa_supplicant/hostapd and other programs using the control
* interface need to use matching path configuration.
*/
struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path);
/**
* wpa_ctrl_close - Close a control interface to wpa_supplicant/hostapd
* @ctrl: Control interface data from wpa_ctrl_open()
*
* This function is used to close a control interface.
*/
void wpa_ctrl_close(struct wpa_ctrl *ctrl);
/**
* wpa_ctrl_request - Send a command to wpa_supplicant/hostapd
* @ctrl: Control interface data from wpa_ctrl_open()
* @cmd: Command; usually, ASCII text, e.g., "PING"
* @cmd_len: Length of the cmd in bytes
* @reply: Buffer for the response
* @reply_len: Reply buffer length
* @msg_cb: Callback function for unsolicited messages or %NULL if not used
* Returns: 0 on success, -1 on error (send or receive failed), -2 on timeout
*
* This function is used to send commands to wpa_supplicant/hostapd. Received
* response will be written to reply and reply_len is set to the actual length
* of the reply. This function will block for up to two seconds while waiting
* for the reply. If unsolicited messages are received, the blocking time may
* be longer.
*
* msg_cb can be used to register a callback function that will be called for
* unsolicited messages received while waiting for the command response. These
* messages may be received if wpa_ctrl_request() is called at the same time as
* wpa_supplicant/hostapd is sending such a message. This can happen only if
* the program has used wpa_ctrl_attach() to register itself as a monitor for
* event messages. Alternatively to msg_cb, programs can register two control
* interface connections and use one of them for commands and the other one for
* receiving event messages, in other words, call wpa_ctrl_attach() only for
* the control interface connection that will be used for event messages.
*/
int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,
char *reply, size_t *reply_len,
void (*msg_cb)(char *msg, size_t len));
/**
* wpa_ctrl_attach - Register as an event monitor for the control interface
* @ctrl: Control interface data from wpa_ctrl_open()
* Returns: 0 on success, -1 on failure, -2 on timeout
*
* This function registers the control interface connection as a monitor for
* wpa_supplicant/hostapd events. After a success wpa_ctrl_attach() call, the
* control interface connection starts receiving event messages that can be
* read with wpa_ctrl_recv().
*/
int wpa_ctrl_attach(struct wpa_ctrl *ctrl);
/**
* wpa_ctrl_detach - Unregister event monitor from the control interface
* @ctrl: Control interface data from wpa_ctrl_open()
* Returns: 0 on success, -1 on failure, -2 on timeout
*
* This function unregisters the control interface connection as a monitor for
* wpa_supplicant/hostapd events, i.e., cancels the registration done with
* wpa_ctrl_attach().
*/
int wpa_ctrl_detach(struct wpa_ctrl *ctrl);
/**
* wpa_ctrl_recv - Receive a pending control interface message
* @ctrl: Control interface data from wpa_ctrl_open()
* @reply: Buffer for the message data
* @reply_len: Length of the reply buffer
* Returns: 0 on success, -1 on failure
*
* This function will receive a pending control interface message. This
* function will block if no messages are available. The received response will
* be written to reply and reply_len is set to the actual length of the reply.
* wpa_ctrl_recv() is only used for event messages, i.e., wpa_ctrl_attach()
* must have been used to register the control interface as an event monitor.
*/
int wpa_ctrl_recv(struct wpa_ctrl *ctrl, char *reply, size_t *reply_len);
/**
* wpa_ctrl_pending - Check whether there are pending event messages
* @ctrl: Control interface data from wpa_ctrl_open()
* Returns: Non-zero if there are pending messages
*
* This function will check whether there are any pending control interface
* message available to be received with wpa_ctrl_recv(). wpa_ctrl_pending() is
* only used for event messages, i.e., wpa_ctrl_attach() must have been used to
* register the control interface as an event monitor.
*/
int wpa_ctrl_pending(struct wpa_ctrl *ctrl);
/**
* wpa_ctrl_get_fd - Get file descriptor used by the control interface
* @ctrl: Control interface data from wpa_ctrl_open()
* Returns: File descriptor used for the connection
*
* This function can be used to get the file descriptor that is used for the
* control interface connection. The returned value can be used, e.g., with
* select() while waiting for multiple events.
*
* The returned file descriptor must not be used directly for sending or
* receiving packets; instead, the library functions wpa_ctrl_request() and
* wpa_ctrl_recv() must be used for this.
*/
int wpa_ctrl_get_fd(struct wpa_ctrl *ctrl);
#ifdef __cplusplus
}
#endif
#endif /* WPA_CTRL_H */
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