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NetBSD/dist/wpa/wpa_supplicant/ctrl_iface_dbus.c

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/*
* 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 "common.h"
#include "eloop.h"
#include "config.h"
#include "wpa_supplicant_i.h"
#include "ctrl_iface_dbus.h"
#include "ctrl_iface_dbus_handlers.h"
#define _DBUS_VERSION (DBUS_VERSION_MAJOR << 8 | DBUS_VERSION_MINOR)
#define DBUS_VER(major, minor) ((major) << 8 | (minor))
#if _DBUS_VERSION < DBUS_VER(1,1)
#define dbus_watch_get_unix_fd dbus_watch_get_fd
#endif
struct ctrl_iface_dbus_priv {
DBusConnection *con;
int should_dispatch;
struct wpa_global *global;
u32 next_objid;
};
static void process_watch(struct ctrl_iface_dbus_priv *iface,
DBusWatch *watch, eloop_event_type type)
{
dbus_connection_ref(iface->con);
iface->should_dispatch = 0;
if (type == EVENT_TYPE_READ)
dbus_watch_handle(watch, DBUS_WATCH_READABLE);
else if (type == EVENT_TYPE_WRITE)
dbus_watch_handle(watch, DBUS_WATCH_WRITABLE);
else if (type == EVENT_TYPE_EXCEPTION)
dbus_watch_handle(watch, DBUS_WATCH_ERROR);
if (iface->should_dispatch) {
while (dbus_connection_get_dispatch_status(iface->con) ==
DBUS_DISPATCH_DATA_REMAINS)
dbus_connection_dispatch(iface->con);
iface->should_dispatch = 0;
}
dbus_connection_unref(iface->con);
}
static void process_watch_exception(int sock, void *eloop_ctx, void *sock_ctx)
{
process_watch(eloop_ctx, sock_ctx, EVENT_TYPE_EXCEPTION);
}
static void process_watch_read(int sock, void *eloop_ctx, void *sock_ctx)
{
process_watch(eloop_ctx, sock_ctx, EVENT_TYPE_READ);
}
static void process_watch_write(int sock, void *eloop_ctx, void *sock_ctx)
{
process_watch(eloop_ctx, sock_ctx, EVENT_TYPE_WRITE);
}
static void connection_setup_add_watch(struct ctrl_iface_dbus_priv *iface,
DBusWatch *watch)
{
unsigned int flags;
int fd;
if (!dbus_watch_get_enabled(watch))
return;
flags = dbus_watch_get_flags(watch);
fd = dbus_watch_get_unix_fd(watch);
eloop_register_sock(fd, EVENT_TYPE_EXCEPTION, process_watch_exception,
iface, watch);
if (flags & DBUS_WATCH_READABLE) {
eloop_register_sock(fd, EVENT_TYPE_READ, process_watch_read,
iface, watch);
}
if (flags & DBUS_WATCH_WRITABLE) {
eloop_register_sock(fd, EVENT_TYPE_WRITE, process_watch_write,
iface, watch);
}
dbus_watch_set_data(watch, iface, NULL);
}
static void connection_setup_remove_watch(struct ctrl_iface_dbus_priv *iface,
DBusWatch *watch)
{
unsigned int flags;
int fd;
flags = dbus_watch_get_flags(watch);
fd = dbus_watch_get_unix_fd(watch);
eloop_unregister_sock(fd, EVENT_TYPE_EXCEPTION);
if (flags & DBUS_WATCH_READABLE)
eloop_unregister_sock(fd, EVENT_TYPE_READ);
if (flags & DBUS_WATCH_WRITABLE)
eloop_unregister_sock(fd, EVENT_TYPE_WRITE);
dbus_watch_set_data(watch, NULL, NULL);
}
static dbus_bool_t add_watch(DBusWatch *watch, void *data)
{
connection_setup_add_watch(data, watch);
return TRUE;
}
static void remove_watch(DBusWatch *watch, void *data)
{
connection_setup_remove_watch(data, watch);
}
static void watch_toggled(DBusWatch *watch, void *data)
{
if (dbus_watch_get_enabled(watch))
add_watch(watch, data);
else
remove_watch(watch, data);
}
static void process_timeout(void *eloop_ctx, void *sock_ctx)
{
DBusTimeout *timeout = sock_ctx;
dbus_timeout_handle(timeout);
}
static void connection_setup_add_timeout(struct ctrl_iface_dbus_priv *iface,
DBusTimeout *timeout)
{
if (!dbus_timeout_get_enabled(timeout))
return;
eloop_register_timeout(0, dbus_timeout_get_interval(timeout) * 1000,
process_timeout, iface, timeout);
dbus_timeout_set_data(timeout, iface, NULL);
}
static void connection_setup_remove_timeout(struct ctrl_iface_dbus_priv *iface,
DBusTimeout *timeout)
{
eloop_cancel_timeout(process_timeout, iface, timeout);
dbus_timeout_set_data(timeout, NULL, NULL);
}
static dbus_bool_t add_timeout(DBusTimeout *timeout, void *data)
{
if (!dbus_timeout_get_enabled(timeout))
return TRUE;
connection_setup_add_timeout(data, timeout);
return TRUE;
}
static void remove_timeout(DBusTimeout *timeout, void *data)
{
connection_setup_remove_timeout(data, timeout);
}
static void timeout_toggled(DBusTimeout *timeout, void *data)
{
if (dbus_timeout_get_enabled(timeout))
add_timeout(timeout, data);
else
remove_timeout(timeout, data);
}
static void process_wakeup_main(int sig, void *eloop_ctx, void *signal_ctx)
{
struct ctrl_iface_dbus_priv *iface = signal_ctx;
if (sig != SIGPOLL || !iface->con)
return;
if (dbus_connection_get_dispatch_status(iface->con) !=
DBUS_DISPATCH_DATA_REMAINS)
return;
/* Only dispatch once - we do not want to starve other events */
dbus_connection_ref(iface->con);
dbus_connection_dispatch(iface->con);
dbus_connection_unref(iface->con);
}
/**
* wakeup_main - Attempt to wake our mainloop up
* @data: dbus control interface private data
*
* Try to wake up the main eloop so it will process
* dbus events that may have happened.
*/
static void wakeup_main(void *data)
{
struct ctrl_iface_dbus_priv *iface = data;
/* Use SIGPOLL to break out of the eloop select() */
raise(SIGPOLL);
iface->should_dispatch = 1;
}
/**
* connection_setup_wakeup_main - Tell dbus about our wakeup_main function
* @iface: dbus control interface private data
* Returns: 0 on success, -1 on failure
*
* Register our wakeup_main handler with dbus
*/
static int connection_setup_wakeup_main(struct ctrl_iface_dbus_priv *iface)
{
if (eloop_register_signal(SIGPOLL, process_wakeup_main, iface))
return -1;
dbus_connection_set_wakeup_main_function(iface->con, wakeup_main,
iface, NULL);
return 0;
}
/**
* wpa_supplicant_dbus_next_objid - Return next available object id
* @iface: dbus control interface private data
* Returns: Object id
*/
u32 wpa_supplicant_dbus_next_objid (struct ctrl_iface_dbus_priv *iface)
{
return iface->next_objid++;
}
/**
* 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 = 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 = 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 = 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)
{
DBusMessage *reply = NULL;
const char *method = dbus_message_get_member(message);
struct wpa_scan_res *res = NULL;
size_t i;
/* Ensure we actually have scan data */
if (wpa_s->scan_res == NULL &&
wpa_supplicant_get_scan_results(wpa_s) < 0) {
reply = wpas_dbus_new_invalid_bssid_error(message);
goto out;
}
/* Find the bssid's scan data */
for (i = 0; i < wpa_s->scan_res->num; i++) {
struct wpa_scan_res *search_res = wpa_s->scan_res->res[i];
char mac_str[18];
memset(mac_str, 0, sizeof(mac_str));
snprintf(mac_str, sizeof(mac_str) - 1, WPAS_DBUS_BSSID_FORMAT,
MAC2STR(search_res->bssid));
if (!strcmp(bssid, mac_str)) {
res = search_res;
break;
}
}
if (!res) {
reply = wpas_dbus_new_invalid_bssid_error(message);
goto out;
}
/* Dispatch the method call against the scanned bssid */
if (!strcmp(method, "properties"))
reply = wpas_dbus_bssid_properties(message, wpa_s, res);
out:
return reply;
}
/**
* 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, "setBlobs"))
reply = wpas_dbus_iface_set_blobs(message, wpa_s);
else if (!strcmp(method, "removeBlobs"))
reply = wpas_dbus_iface_remove_blobs(message, wpa_s);
}
/* If the message was handled, send back the reply */
if (reply) {
dbus_connection_send(connection, reply, NULL);
dbus_message_unref(reply);
}
out:
free(iface_obj_path);
free(network);
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 ctrl_iface_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);
}
}
/* If the message was handled, send back the reply */
if (reply) {
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 ctrl_iface_dbus_priv *iface = wpa_s->global->dbus_ctrl_iface;
DBusMessage *_signal;
const char *path;
/* Do nothing if the control interface is not turned on */
if (iface == NULL)
return;
path = wpa_supplicant_get_dbus_path(wpa_s);
if (path == NULL) {
perror("wpa_supplicant_dbus_notify_scan_results[dbus]: "
"interface didn't have a dbus path");
wpa_printf(MSG_ERROR,
"wpa_supplicant_dbus_notify_scan_results[dbus]: "
"interface didn't have a dbus path; can't send "
"scan result signal.");
return;
}
_signal = dbus_message_new_signal(path, WPAS_DBUS_IFACE_INTERFACE,
"ScanResultsAvailable");
if (_signal == NULL) {
perror("wpa_supplicant_dbus_notify_scan_results[dbus]: "
"couldn't create dbus signal; likely out of memory");
wpa_printf(MSG_ERROR, "dbus control interface: 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,
wpa_states new_state,
wpa_states old_state)
{
struct ctrl_iface_dbus_priv *iface;
DBusMessage *_signal = NULL;
const char *path;
const char *new_state_str, *old_state_str;
/* Do nothing if the control interface is not turned on */
if (wpa_s->global == NULL)
return;
iface = wpa_s->global->dbus_ctrl_iface;
if (iface == NULL)
return;
/* Only send signal if state really changed */
if (new_state == old_state)
return;
path = wpa_supplicant_get_dbus_path(wpa_s);
if (path == NULL) {
perror("wpa_supplicant_dbus_notify_state_change[dbus]: "
"interface didn't have a dbus path");
wpa_printf(MSG_ERROR,
"wpa_supplicant_dbus_notify_state_change[dbus]: "
"interface didn't have a dbus path; can't send "
"signal.");
return;
}
_signal = dbus_message_new_signal(path, WPAS_DBUS_IFACE_INTERFACE,
"StateChange");
if (_signal == NULL) {
perror("wpa_supplicant_dbus_notify_state_change[dbus]: "
"couldn't create dbus signal; likely out of memory");
wpa_printf(MSG_ERROR,
"wpa_supplicant_dbus_notify_state_change[dbus]: "
"couldn't 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) {
perror("wpa_supplicant_dbus_notify_state_change[dbus]: "
"couldn't convert state strings");
wpa_printf(MSG_ERROR,
"wpa_supplicant_dbus_notify_state_change[dbus]: "
"couldn't 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)) {
perror("wpa_supplicant_dbus_notify_state_change[dbus]: "
"not enough memory to construct state change signal.");
wpa_printf(MSG_ERROR,
"wpa_supplicant_dbus_notify_state_change[dbus]: "
"not enough memory to construct state change "
"signal.");
goto out;
}
dbus_connection_send(iface->con, _signal, NULL);
out:
dbus_message_unref(_signal);
}
/**
* integrate_with_eloop - Register our mainloop integration with dbus
* @connection: connection to the system message bus
* @iface: a dbus control interface data structure
* Returns: 0 on success, -1 on failure
*
* We register our mainloop integration functions with dbus here.
*/
static int integrate_with_eloop(DBusConnection *connection,
struct ctrl_iface_dbus_priv *iface)
{
if (!dbus_connection_set_watch_functions(connection, add_watch,
remove_watch, watch_toggled,
iface, NULL)) {
perror("dbus_connection_set_watch_functions[dbus]");
wpa_printf(MSG_ERROR, "Not enough memory to set up dbus.");
return -1;
}
if (!dbus_connection_set_timeout_functions(connection, add_timeout,
remove_timeout,
timeout_toggled, iface,
NULL)) {
perror("dbus_connection_set_timeout_functions[dbus]");
wpa_printf(MSG_ERROR, "Not enough memory to set up dbus.");
return -1;
}
if (connection_setup_wakeup_main(iface) < 0) {
perror("connection_setup_wakeup_main[dbus]");
wpa_printf(MSG_ERROR, "Could not setup main wakeup function.");
return -1;
}
return 0;
}
/**
* dispatch_initial_dbus_messages - Dispatch initial dbus messages after
* claiming bus name
* @eloop_ctx: the DBusConnection to dispatch on
* @timeout_ctx: unused
*
* If clients are quick to notice that wpa_supplicant claimed its bus name,
* there may have been messages that came in before initialization was
* all finished. Dispatch those here.
*/
static void dispatch_initial_dbus_messages(void *eloop_ctx, void *timeout_ctx)
{
DBusConnection *con = eloop_ctx;
while (dbus_connection_get_dispatch_status(con) ==
DBUS_DISPATCH_DATA_REMAINS)
dbus_connection_dispatch(con);
}
/**
* wpa_supplicant_dbus_ctrl_iface_init - Initialize dbus control interface
* @global: Pointer to global data from wpa_supplicant_init()
* Returns: Pointer to dbus_ctrl_iface date or %NULL on failure
*
* Initialize the dbus control interface and start receiving commands from
* external programs over the bus.
*/
struct ctrl_iface_dbus_priv *
wpa_supplicant_dbus_ctrl_iface_init(struct wpa_global *global)
{
struct ctrl_iface_dbus_priv *iface;
DBusError error;
int ret = -1;
DBusObjectPathVTable wpas_vtable = {
NULL, &wpas_message_handler, NULL, NULL, NULL, NULL
};
iface = os_zalloc(sizeof(struct ctrl_iface_dbus_priv));
if (iface == NULL)
return NULL;
iface->global = global;
/* Get a reference to the system bus */
dbus_error_init(&error);
iface->con = dbus_bus_get(DBUS_BUS_SYSTEM, &error);
dbus_error_free(&error);
if (!iface->con) {
perror("dbus_bus_get[ctrl_iface_dbus]");
wpa_printf(MSG_ERROR, "Could not acquire the system bus.");
goto fail;
}
/* Tell dbus about our mainloop integration functions */
if (integrate_with_eloop(iface->con, iface))
goto fail;
/* Register the message handler for the global dbus interface */
if (!dbus_connection_register_object_path(iface->con,
WPAS_DBUS_PATH, &wpas_vtable,
iface)) {
perror("dbus_connection_register_object_path[dbus]");
wpa_printf(MSG_ERROR, "Could not set up DBus message "
"handler.");
goto fail;
}
/* 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:
perror("dbus_bus_request_name[dbus]");
wpa_printf(MSG_ERROR, "Could not request DBus service name: "
"already registered.");
break;
default:
perror("dbus_bus_request_name[dbus]");
wpa_printf(MSG_ERROR, "Could not request DBus service name: "
"%s %s.", error.name, error.message);
break;
}
dbus_error_free(&error);
if (ret != 0)
goto fail;
wpa_printf(MSG_DEBUG, "Providing DBus service '" WPAS_DBUS_SERVICE
"'.");
/*
* Dispatch initial DBus messages that may have come in since the bus
* name was claimed above. Happens when clients are quick to notice the
* wpa_supplicant service.
*
* FIXME: is there a better solution to this problem?
*/
eloop_register_timeout(0, 50, dispatch_initial_dbus_messages,
iface->con, NULL);
return iface;
fail:
wpa_supplicant_dbus_ctrl_iface_deinit(iface);
return NULL;
}
/**
* wpa_supplicant_dbus_ctrl_iface_deinit - Deinitialize dbus ctrl interface
* @iface: Pointer to dbus private data from
* wpa_supplicant_dbus_ctrl_iface_init()
*
* Deinitialize the dbus control interface that was initialized with
* wpa_supplicant_dbus_ctrl_iface_init().
*/
void wpa_supplicant_dbus_ctrl_iface_deinit(struct ctrl_iface_dbus_priv *iface)
{
if (iface == NULL)
return;
if (iface->con) {
eloop_cancel_timeout(dispatch_initial_dbus_messages,
iface->con, NULL);
dbus_connection_set_watch_functions(iface->con, NULL, NULL,
NULL, NULL, NULL);
dbus_connection_set_timeout_functions(iface->con, NULL, NULL,
NULL, NULL, NULL);
dbus_connection_unref(iface->con);
}
memset(iface, 0, sizeof(struct ctrl_iface_dbus_priv));
free(iface);
}
/**
* wpas_dbus_register_new_iface - Register a new interface with dbus
* @global: Global %wpa_supplicant data
* @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 ctrl_iface_dbus_priv *ctrl_iface =
wpa_s->global->dbus_ctrl_iface;
DBusConnection * con;
u32 next;
DBusObjectPathVTable vtable = {
NULL, &wpas_iface_message_handler, NULL, NULL, NULL, NULL
};
char *path;
int ret = -1;
/* Do nothing if the control interface is not turned on */
if (ctrl_iface == NULL)
return 0;
con = ctrl_iface->con;
next = wpa_supplicant_dbus_next_objid(ctrl_iface);
/* Create and set the interface's object path */
path = os_zalloc(WPAS_DBUS_OBJECT_PATH_MAX);
if (path == NULL)
return -1;
snprintf(path, WPAS_DBUS_OBJECT_PATH_MAX,
WPAS_DBUS_PATH_INTERFACES "/%u",
next);
if (wpa_supplicant_set_dbus_path(wpa_s, path)) {
wpa_printf(MSG_DEBUG,
"Failed to set dbus path for interface %s",
wpa_s->ifname);
goto out;
}
/* Register the message handler for the interface functions */
if (!dbus_connection_register_fallback(con, path, &vtable, wpa_s)) {
perror("wpas_dbus_register_iface [dbus]");
wpa_printf(MSG_ERROR, "Could not set up DBus message "
"handler for interface %s.", wpa_s->ifname);
goto out;
}
ret = 0;
out:
free(path);
return ret;
}
/**
* 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 ctrl_iface_dbus_priv *ctrl_iface;
DBusConnection *con;
const char *path;
/* 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_ctrl_iface;
if (ctrl_iface == NULL)
return 0;
con = ctrl_iface->con;
path = wpa_supplicant_get_dbus_path(wpa_s);
if (!dbus_connection_unregister_object_path(con, path))
return -1;
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;
}
/**
* wpa_supplicant_set_dbus_path - Assign a dbus path to an interface
* @wpa_s: wpa_supplicant interface structure
* @path: dbus path to set on the interface
* Returns: 0 on succes, -1 on error
*/
int wpa_supplicant_set_dbus_path(struct wpa_supplicant *wpa_s,
const char *path)
{
u32 len = strlen (path);
if (len >= WPAS_DBUS_OBJECT_PATH_MAX)
return -1;
if (wpa_s->dbus_path)
return -1;
wpa_s->dbus_path = strdup(path);
return 0;
}
/**
* wpa_supplicant_get_dbus_path - Get an interface's dbus path
* @wpa_s: %wpa_supplicant interface structure
* Returns: Interface's dbus object path, or %NULL on error
*/
const char * wpa_supplicant_get_dbus_path(struct wpa_supplicant *wpa_s)
{
return wpa_s->dbus_path;
}
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