hostap/wpa_supplicant/dbus/dbus_old.c
Michael Chang ade74830b4 Add dbus signal for information about server certification
In general, this patch attemps to extend commit
00468b4650 with dbus support.

This can be used by dbus client to implement subject match text
entry with preset value probed from server. This preset value, if
user accepts it, is remembered and passed to subject_match config
for any future authentication.

Signed-off-by: Michael Chang <mchang@novell.com>
2011-07-05 12:22:32 +03:00

750 lines
22 KiB
C

/*
* WPA Supplicant / dbus-based control interface
* Copyright (c) 2006, Dan Williams <dcbw@redhat.com> and Red Hat, Inc.
*
* 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.
*/
#include "includes.h"
#include <dbus/dbus.h>
#include "common.h"
#include "eloop.h"
#include "wps/wps.h"
#include "../config.h"
#include "../wpa_supplicant_i.h"
#include "../bss.h"
#include "dbus_old.h"
#include "dbus_old_handlers.h"
#include "dbus_common.h"
#include "dbus_common_i.h"
/**
* wpas_dbus_decompose_object_path - Decompose an interface object path into parts
* @path: The dbus object path
* @network: (out) the configured network this object path refers to, if any
* @bssid: (out) the scanned bssid this object path refers to, if any
* Returns: The object path of the network interface this path refers to
*
* For a given object path, decomposes the object path into object id, network,
* and BSSID parts, if those parts exist.
*/
char * wpas_dbus_decompose_object_path(const char *path, char **network,
char **bssid)
{
const unsigned int dev_path_prefix_len =
strlen(WPAS_DBUS_PATH_INTERFACES "/");
char *obj_path_only;
char *next_sep;
/* Be a bit paranoid about path */
if (!path || strncmp(path, WPAS_DBUS_PATH_INTERFACES "/",
dev_path_prefix_len))
return NULL;
/* Ensure there's something at the end of the path */
if ((path + dev_path_prefix_len)[0] == '\0')
return NULL;
obj_path_only = os_strdup(path);
if (obj_path_only == NULL)
return NULL;
next_sep = strchr(obj_path_only + dev_path_prefix_len, '/');
if (next_sep != NULL) {
const char *net_part = strstr(next_sep,
WPAS_DBUS_NETWORKS_PART "/");
const char *bssid_part = strstr(next_sep,
WPAS_DBUS_BSSIDS_PART "/");
if (network && net_part) {
/* Deal with a request for a configured network */
const char *net_name = net_part +
strlen(WPAS_DBUS_NETWORKS_PART "/");
*network = NULL;
if (strlen(net_name))
*network = os_strdup(net_name);
} else if (bssid && bssid_part) {
/* Deal with a request for a scanned BSSID */
const char *bssid_name = bssid_part +
strlen(WPAS_DBUS_BSSIDS_PART "/");
if (strlen(bssid_name))
*bssid = os_strdup(bssid_name);
else
*bssid = NULL;
}
/* Cut off interface object path before "/" */
*next_sep = '\0';
}
return obj_path_only;
}
/**
* wpas_dbus_new_invalid_iface_error - Return a new invalid interface error message
* @message: Pointer to incoming dbus message this error refers to
* Returns: A dbus error message
*
* Convenience function to create and return an invalid interface error
*/
DBusMessage * wpas_dbus_new_invalid_iface_error(DBusMessage *message)
{
return dbus_message_new_error(message, WPAS_ERROR_INVALID_IFACE,
"wpa_supplicant knows nothing about "
"this interface.");
}
/**
* wpas_dbus_new_invalid_network_error - Return a new invalid network error message
* @message: Pointer to incoming dbus message this error refers to
* Returns: a dbus error message
*
* Convenience function to create and return an invalid network error
*/
DBusMessage * wpas_dbus_new_invalid_network_error(DBusMessage *message)
{
return dbus_message_new_error(message, WPAS_ERROR_INVALID_NETWORK,
"The requested network does not exist.");
}
/**
* wpas_dbus_new_invalid_bssid_error - Return a new invalid bssid error message
* @message: Pointer to incoming dbus message this error refers to
* Returns: a dbus error message
*
* Convenience function to create and return an invalid bssid error
*/
static DBusMessage * wpas_dbus_new_invalid_bssid_error(DBusMessage *message)
{
return dbus_message_new_error(message, WPAS_ERROR_INVALID_BSSID,
"The BSSID requested was invalid.");
}
/**
* wpas_dispatch_network_method - dispatch messages for configured networks
* @message: the incoming dbus message
* @wpa_s: a network interface's data
* @network_id: id of the configured network we're interested in
* Returns: a reply dbus message, or a dbus error message
*
* This function dispatches all incoming dbus messages for configured networks.
*/
static DBusMessage * wpas_dispatch_network_method(DBusMessage *message,
struct wpa_supplicant *wpa_s,
int network_id)
{
DBusMessage *reply = NULL;
const char *method = dbus_message_get_member(message);
struct wpa_ssid *ssid;
ssid = wpa_config_get_network(wpa_s->conf, network_id);
if (ssid == NULL)
return wpas_dbus_new_invalid_network_error(message);
if (!strcmp(method, "set"))
reply = wpas_dbus_iface_set_network(message, wpa_s, ssid);
else if (!strcmp(method, "enable"))
reply = wpas_dbus_iface_enable_network(message, wpa_s, ssid);
else if (!strcmp(method, "disable"))
reply = wpas_dbus_iface_disable_network(message, wpa_s, ssid);
return reply;
}
/**
* wpas_dispatch_bssid_method - dispatch messages for scanned networks
* @message: the incoming dbus message
* @wpa_s: a network interface's data
* @bssid: bssid of the scanned network we're interested in
* Returns: a reply dbus message, or a dbus error message
*
* This function dispatches all incoming dbus messages for scanned networks.
*/
static DBusMessage * wpas_dispatch_bssid_method(DBusMessage *message,
struct wpa_supplicant *wpa_s,
const char *bssid_txt)
{
u8 bssid[ETH_ALEN];
struct wpa_bss *bss;
if (hexstr2bin(bssid_txt, bssid, ETH_ALEN) < 0)
return wpas_dbus_new_invalid_bssid_error(message);
bss = wpa_bss_get_bssid(wpa_s, bssid);
if (bss == NULL)
return wpas_dbus_new_invalid_bssid_error(message);
/* Dispatch the method call against the scanned bssid */
if (os_strcmp(dbus_message_get_member(message), "properties") == 0)
return wpas_dbus_bssid_properties(message, wpa_s, bss);
return NULL;
}
/**
* wpas_iface_message_handler - Dispatch messages for interfaces or networks
* @connection: Connection to the system message bus
* @message: An incoming dbus message
* @user_data: A pointer to a dbus control interface data structure
* Returns: Whether or not the message was handled
*
* This function dispatches all incoming dbus messages for network interfaces,
* or objects owned by them, such as scanned BSSIDs and configured networks.
*/
static DBusHandlerResult wpas_iface_message_handler(DBusConnection *connection,
DBusMessage *message,
void *user_data)
{
struct wpa_supplicant *wpa_s = user_data;
const char *method = dbus_message_get_member(message);
const char *path = dbus_message_get_path(message);
const char *msg_interface = dbus_message_get_interface(message);
char *iface_obj_path = NULL;
char *network = NULL;
char *bssid = NULL;
DBusMessage *reply = NULL;
/* Caller must specify a message interface */
if (!msg_interface)
goto out;
iface_obj_path = wpas_dbus_decompose_object_path(path, &network,
&bssid);
if (iface_obj_path == NULL) {
reply = wpas_dbus_new_invalid_iface_error(message);
goto out;
}
/* Make sure the message's object path actually refers to the
* wpa_supplicant structure it's supposed to (which is wpa_s)
*/
if (wpa_supplicant_get_iface_by_dbus_path(wpa_s->global,
iface_obj_path) != wpa_s) {
reply = wpas_dbus_new_invalid_iface_error(message);
goto out;
}
if (network && !strcmp(msg_interface, WPAS_DBUS_IFACE_NETWORK)) {
/* A method for one of this interface's configured networks */
int nid = strtoul(network, NULL, 10);
if (errno != EINVAL)
reply = wpas_dispatch_network_method(message, wpa_s,
nid);
else
reply = wpas_dbus_new_invalid_network_error(message);
} else if (bssid && !strcmp(msg_interface, WPAS_DBUS_IFACE_BSSID)) {
/* A method for one of this interface's scanned BSSIDs */
reply = wpas_dispatch_bssid_method(message, wpa_s, bssid);
} else if (!strcmp(msg_interface, WPAS_DBUS_IFACE_INTERFACE)) {
/* A method for an interface only. */
if (!strcmp(method, "scan"))
reply = wpas_dbus_iface_scan(message, wpa_s);
else if (!strcmp(method, "scanResults"))
reply = wpas_dbus_iface_scan_results(message, wpa_s);
else if (!strcmp(method, "addNetwork"))
reply = wpas_dbus_iface_add_network(message, wpa_s);
else if (!strcmp(method, "removeNetwork"))
reply = wpas_dbus_iface_remove_network(message, wpa_s);
else if (!strcmp(method, "selectNetwork"))
reply = wpas_dbus_iface_select_network(message, wpa_s);
else if (!strcmp(method, "capabilities"))
reply = wpas_dbus_iface_capabilities(message, wpa_s);
else if (!strcmp(method, "disconnect"))
reply = wpas_dbus_iface_disconnect(message, wpa_s);
else if (!strcmp(method, "setAPScan"))
reply = wpas_dbus_iface_set_ap_scan(message, wpa_s);
else if (!strcmp(method, "setSmartcardModules"))
reply = wpas_dbus_iface_set_smartcard_modules(message,
wpa_s);
else if (!strcmp(method, "state"))
reply = wpas_dbus_iface_get_state(message, wpa_s);
else if (!strcmp(method, "scanning"))
reply = wpas_dbus_iface_get_scanning(message, wpa_s);
else if (!strcmp(method, "setBlobs"))
reply = wpas_dbus_iface_set_blobs(message, wpa_s);
else if (!strcmp(method, "removeBlobs"))
reply = wpas_dbus_iface_remove_blobs(message, wpa_s);
#ifdef CONFIG_WPS
else if (!os_strcmp(method, "wpsPbc"))
reply = wpas_dbus_iface_wps_pbc(message, wpa_s);
else if (!os_strcmp(method, "wpsPin"))
reply = wpas_dbus_iface_wps_pin(message, wpa_s);
else if (!os_strcmp(method, "wpsReg"))
reply = wpas_dbus_iface_wps_reg(message, wpa_s);
#endif /* CONFIG_WPS */
else if (!os_strcmp(method, "flush"))
reply = wpas_dbus_iface_flush(message, wpa_s);
}
/* If the message was handled, send back the reply */
if (reply) {
if (!dbus_message_get_no_reply(message))
dbus_connection_send(connection, reply, NULL);
dbus_message_unref(reply);
}
out:
os_free(iface_obj_path);
os_free(network);
os_free(bssid);
return reply ? DBUS_HANDLER_RESULT_HANDLED :
DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
/**
* wpas_message_handler - dispatch incoming dbus messages
* @connection: connection to the system message bus
* @message: an incoming dbus message
* @user_data: a pointer to a dbus control interface data structure
* Returns: whether or not the message was handled
*
* This function dispatches all incoming dbus messages to the correct
* handlers, depending on what the message's target object path is,
* and what the method call is.
*/
static DBusHandlerResult wpas_message_handler(DBusConnection *connection,
DBusMessage *message, void *user_data)
{
struct wpas_dbus_priv *ctrl_iface = user_data;
const char *method;
const char *path;
const char *msg_interface;
DBusMessage *reply = NULL;
method = dbus_message_get_member(message);
path = dbus_message_get_path(message);
msg_interface = dbus_message_get_interface(message);
if (!method || !path || !ctrl_iface || !msg_interface)
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
/* Validate the method interface */
if (strcmp(msg_interface, WPAS_DBUS_INTERFACE) != 0)
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
if (!strcmp(path, WPAS_DBUS_PATH)) {
/* dispatch methods against our global dbus interface here */
if (!strcmp(method, "addInterface")) {
reply = wpas_dbus_global_add_interface(
message, ctrl_iface->global);
} else if (!strcmp(method, "removeInterface")) {
reply = wpas_dbus_global_remove_interface(
message, ctrl_iface->global);
} else if (!strcmp(method, "getInterface")) {
reply = wpas_dbus_global_get_interface(
message, ctrl_iface->global);
} else if (!strcmp(method, "setDebugParams")) {
reply = wpas_dbus_global_set_debugparams(
message, ctrl_iface->global);
}
}
/* If the message was handled, send back the reply */
if (reply) {
if (!dbus_message_get_no_reply(message))
dbus_connection_send(connection, reply, NULL);
dbus_message_unref(reply);
}
return reply ? DBUS_HANDLER_RESULT_HANDLED :
DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
/**
* wpa_supplicant_dbus_notify_scan_results - Send a scan results signal
* @wpa_s: %wpa_supplicant network interface data
* Returns: 0 on success, -1 on failure
*
* Notify listeners that this interface has updated scan results.
*/
void wpa_supplicant_dbus_notify_scan_results(struct wpa_supplicant *wpa_s)
{
struct wpas_dbus_priv *iface = wpa_s->global->dbus;
DBusMessage *_signal;
/* Do nothing if the control interface is not turned on */
if (iface == NULL)
return;
_signal = dbus_message_new_signal(wpa_s->dbus_path,
WPAS_DBUS_IFACE_INTERFACE,
"ScanResultsAvailable");
if (_signal == NULL) {
wpa_printf(MSG_ERROR, "dbus: Not enough memory to send scan "
"results signal");
return;
}
dbus_connection_send(iface->con, _signal, NULL);
dbus_message_unref(_signal);
}
/**
* wpa_supplicant_dbus_notify_state_change - Send a state change signal
* @wpa_s: %wpa_supplicant network interface data
* @new_state: new state wpa_supplicant is entering
* @old_state: old state wpa_supplicant is leaving
* Returns: 0 on success, -1 on failure
*
* Notify listeners that wpa_supplicant has changed state
*/
void wpa_supplicant_dbus_notify_state_change(struct wpa_supplicant *wpa_s,
enum wpa_states new_state,
enum wpa_states old_state)
{
struct wpas_dbus_priv *iface;
DBusMessage *_signal = NULL;
const char *new_state_str, *old_state_str;
if (wpa_s->dbus_path == NULL)
return; /* Skip signal since D-Bus setup is not yet ready */
/* Do nothing if the control interface is not turned on */
if (wpa_s->global == NULL)
return;
iface = wpa_s->global->dbus;
if (iface == NULL)
return;
/* Only send signal if state really changed */
if (new_state == old_state)
return;
_signal = dbus_message_new_signal(wpa_s->dbus_path,
WPAS_DBUS_IFACE_INTERFACE,
"StateChange");
if (_signal == NULL) {
wpa_printf(MSG_ERROR,
"dbus: wpa_supplicant_dbus_notify_state_change: "
"could not create dbus signal; likely out of "
"memory");
return;
}
new_state_str = wpa_supplicant_state_txt(new_state);
old_state_str = wpa_supplicant_state_txt(old_state);
if (new_state_str == NULL || old_state_str == NULL) {
wpa_printf(MSG_ERROR,
"dbus: wpa_supplicant_dbus_notify_state_change: "
"Could not convert state strings");
goto out;
}
if (!dbus_message_append_args(_signal,
DBUS_TYPE_STRING, &new_state_str,
DBUS_TYPE_STRING, &old_state_str,
DBUS_TYPE_INVALID)) {
wpa_printf(MSG_ERROR,
"dbus: wpa_supplicant_dbus_notify_state_change: "
"Not enough memory to construct state change "
"signal");
goto out;
}
dbus_connection_send(iface->con, _signal, NULL);
out:
dbus_message_unref(_signal);
}
/**
* wpa_supplicant_dbus_notify_scanning - send scanning status
* @wpa_s: %wpa_supplicant network interface data
* Returns: 0 on success, -1 on failure
*
* Notify listeners of interface scanning state changes
*/
void wpa_supplicant_dbus_notify_scanning(struct wpa_supplicant *wpa_s)
{
struct wpas_dbus_priv *iface = wpa_s->global->dbus;
DBusMessage *_signal;
dbus_bool_t scanning = wpa_s->scanning ? TRUE : FALSE;
/* Do nothing if the control interface is not turned on */
if (iface == NULL)
return;
_signal = dbus_message_new_signal(wpa_s->dbus_path,
WPAS_DBUS_IFACE_INTERFACE,
"Scanning");
if (_signal == NULL) {
wpa_printf(MSG_ERROR, "dbus: Not enough memory to send scan "
"results signal");
return;
}
if (dbus_message_append_args(_signal,
DBUS_TYPE_BOOLEAN, &scanning,
DBUS_TYPE_INVALID)) {
dbus_connection_send(iface->con, _signal, NULL);
} else {
wpa_printf(MSG_ERROR, "dbus: Not enough memory to construct "
"signal");
}
dbus_message_unref(_signal);
}
#ifdef CONFIG_WPS
void wpa_supplicant_dbus_notify_wps_cred(struct wpa_supplicant *wpa_s,
const struct wps_credential *cred)
{
struct wpas_dbus_priv *iface;
DBusMessage *_signal = NULL;
/* Do nothing if the control interface is not turned on */
if (wpa_s->global == NULL)
return;
iface = wpa_s->global->dbus;
if (iface == NULL)
return;
_signal = dbus_message_new_signal(wpa_s->dbus_path,
WPAS_DBUS_IFACE_INTERFACE,
"WpsCred");
if (_signal == NULL) {
wpa_printf(MSG_ERROR,
"dbus: wpa_supplicant_dbus_notify_wps_cred: "
"Could not create dbus signal; likely out of "
"memory");
return;
}
if (!dbus_message_append_args(_signal,
DBUS_TYPE_ARRAY, DBUS_TYPE_BYTE,
&cred->cred_attr, cred->cred_attr_len,
DBUS_TYPE_INVALID)) {
wpa_printf(MSG_ERROR,
"dbus: wpa_supplicant_dbus_notify_wps_cred: "
"Not enough memory to construct signal");
goto out;
}
dbus_connection_send(iface->con, _signal, NULL);
out:
dbus_message_unref(_signal);
}
#else /* CONFIG_WPS */
void wpa_supplicant_dbus_notify_wps_cred(struct wpa_supplicant *wpa_s,
const struct wps_credential *cred)
{
}
#endif /* CONFIG_WPS */
void wpa_supplicant_dbus_notify_certification(struct wpa_supplicant *wpa_s,
int depth, const char *subject,
const char *cert_hash,
const struct wpabuf *cert)
{
struct wpas_dbus_priv *iface;
DBusMessage *_signal = NULL;
const char *hash;
const char *cert_hex;
int cert_hex_len;
/* Do nothing if the control interface is not turned on */
if (wpa_s->global == NULL)
return;
iface = wpa_s->global->dbus;
if (iface == NULL)
return;
_signal = dbus_message_new_signal(wpa_s->dbus_path,
WPAS_DBUS_IFACE_INTERFACE,
"Certification");
if (_signal == NULL) {
wpa_printf(MSG_ERROR,
"dbus: wpa_supplicant_dbus_notify_certification: "
"Could not create dbus signal; likely out of "
"memory");
return;
}
hash = cert_hash ? cert_hash : "";
cert_hex = cert ? wpabuf_head(cert) : "";
cert_hex_len = cert ? wpabuf_len(cert) : 0;
if (!dbus_message_append_args(_signal,
DBUS_TYPE_INT32,&depth,
DBUS_TYPE_STRING, &subject,
DBUS_TYPE_STRING, &hash,
DBUS_TYPE_ARRAY, DBUS_TYPE_BYTE,
&cert_hex, cert_hex_len,
DBUS_TYPE_INVALID)) {
wpa_printf(MSG_ERROR,
"dbus: wpa_supplicant_dbus_notify_certification: "
"Not enough memory to construct signal");
goto out;
}
dbus_connection_send(iface->con, _signal, NULL);
out:
dbus_message_unref(_signal);
}
/**
* wpa_supplicant_dbus_ctrl_iface_init - Initialize dbus control interface
* @global: Pointer to global data from wpa_supplicant_init()
* Returns: 0 on success, -1 on failure
*
* Initialize the dbus control interface and start receiving commands from
* external programs over the bus.
*/
int wpa_supplicant_dbus_ctrl_iface_init(struct wpas_dbus_priv *iface)
{
DBusError error;
int ret = -1;
DBusObjectPathVTable wpas_vtable = {
NULL, &wpas_message_handler, NULL, NULL, NULL, NULL
};
/* Register the message handler for the global dbus interface */
if (!dbus_connection_register_object_path(iface->con,
WPAS_DBUS_PATH, &wpas_vtable,
iface)) {
wpa_printf(MSG_ERROR, "dbus: Could not set up message "
"handler");
return -1;
}
/* Register our service with the message bus */
dbus_error_init(&error);
switch (dbus_bus_request_name(iface->con, WPAS_DBUS_SERVICE,
0, &error)) {
case DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER:
ret = 0;
break;
case DBUS_REQUEST_NAME_REPLY_EXISTS:
case DBUS_REQUEST_NAME_REPLY_IN_QUEUE:
case DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER:
wpa_printf(MSG_ERROR, "dbus: Could not request service name: "
"already registered");
break;
default:
wpa_printf(MSG_ERROR, "dbus: Could not request service name: "
"%s %s", error.name, error.message);
break;
}
dbus_error_free(&error);
if (ret != 0)
return -1;
wpa_printf(MSG_DEBUG, "Providing DBus service '" WPAS_DBUS_SERVICE
"'.");
return 0;
}
/**
* wpas_dbus_register_new_iface - Register a new interface with dbus
* @wpa_s: %wpa_supplicant interface description structure to register
* Returns: 0 on success, -1 on error
*
* Registers a new interface with dbus and assigns it a dbus object path.
*/
int wpas_dbus_register_iface(struct wpa_supplicant *wpa_s)
{
struct wpas_dbus_priv *ctrl_iface = wpa_s->global->dbus;
DBusConnection * con;
u32 next;
DBusObjectPathVTable vtable = {
NULL, &wpas_iface_message_handler, NULL, NULL, NULL, NULL
};
/* Do nothing if the control interface is not turned on */
if (ctrl_iface == NULL)
return 0;
con = ctrl_iface->con;
next = ctrl_iface->next_objid++;
/* Create and set the interface's object path */
wpa_s->dbus_path = os_zalloc(WPAS_DBUS_OBJECT_PATH_MAX);
if (wpa_s->dbus_path == NULL)
return -1;
os_snprintf(wpa_s->dbus_path, WPAS_DBUS_OBJECT_PATH_MAX,
WPAS_DBUS_PATH_INTERFACES "/%u",
next);
/* Register the message handler for the interface functions */
if (!dbus_connection_register_fallback(con, wpa_s->dbus_path, &vtable,
wpa_s)) {
wpa_printf(MSG_ERROR, "dbus: Could not set up message "
"handler for interface %s", wpa_s->ifname);
return -1;
}
return 0;
}
/**
* wpas_dbus_unregister_iface - Unregister an interface from dbus
* @wpa_s: wpa_supplicant interface structure
* Returns: 0 on success, -1 on failure
*
* Unregisters the interface with dbus
*/
int wpas_dbus_unregister_iface(struct wpa_supplicant *wpa_s)
{
struct wpas_dbus_priv *ctrl_iface;
DBusConnection *con;
/* Do nothing if the control interface is not turned on */
if (wpa_s == NULL || wpa_s->global == NULL)
return 0;
ctrl_iface = wpa_s->global->dbus;
if (ctrl_iface == NULL)
return 0;
con = ctrl_iface->con;
if (!dbus_connection_unregister_object_path(con, wpa_s->dbus_path))
return -1;
os_free(wpa_s->dbus_path);
wpa_s->dbus_path = NULL;
return 0;
}
/**
* wpa_supplicant_get_iface_by_dbus_path - Get a new network interface
* @global: Pointer to global data from wpa_supplicant_init()
* @path: Pointer to a dbus object path representing an interface
* Returns: Pointer to the interface or %NULL if not found
*/
struct wpa_supplicant * wpa_supplicant_get_iface_by_dbus_path(
struct wpa_global *global, const char *path)
{
struct wpa_supplicant *wpa_s;
for (wpa_s = global->ifaces; wpa_s; wpa_s = wpa_s->next) {
if (strcmp(wpa_s->dbus_path, path) == 0)
return wpa_s;
}
return NULL;
}