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hostapd/wpa_supplicant/dbus/ctrl_iface_dbus_new_helpers.c

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/*
* WPA Supplicant / dbus-based control interface
* Copyright (c) 2006, Dan Williams <dcbw@redhat.com> and Red Hat, Inc.
* Copyright (c) 2009, Witold Sowa <witold.sowa@gmail.com>
*
* 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 "ctrl_iface_dbus_new_helpers.h"
/**
* struct wpa_dbus_method_desc - DBus method description
*/
struct wpa_dbus_method_desc {
/* pointer to next description in list */
struct wpa_dbus_method_desc *next;
/* method interface */
char *dbus_interface;
/* method name */
char *dbus_method;
/* method handling function */
WPADBusMethodHandler method_handler;
/* handler function argument */
void *handler_argument;
/* function used to free handler argument */
WPADBusArgumentFreeFunction argument_free_func;
/* number of method arguments */
int args_num;
/* array of arguments */
struct wpa_dbus_argument args[];
};
/**
* struct wpa_dbus_signal_desc - DBus signal description
*/
struct wpa_dbus_signal_desc {
/* pointer to next description in list */
struct wpa_dbus_signal_desc *next;
/* signal interface */
char *dbus_interface;
/* signal name */
char *dbus_signal;
/* number of signal arguments */
int args_num;
/* array of arguments */
struct wpa_dbus_argument args[0];
};
/**
* struct wpa_dbus_property_desc - DBus property description
*/
struct wpa_dbus_property_desc {
/* pointer to next description in list */
struct wpa_dbus_property_desc *next;
/* property interface */
char *dbus_interface;
/* property name */
char *dbus_property;
/* property type signature in DBus type notation */
char *type;
/* property access permissions */
enum dbus_prop_access access;
/* property getter function */
WPADBusPropertyAccessor getter;
/* property setter function */
WPADBusPropertyAccessor setter;
/* argument for getter and setter functions */
void *user_data;
/* function used to free accessors argument */
WPADBusArgumentFreeFunction user_data_free_func;
};
#ifdef CONFIG_CTRL_IFACE_DBUS_INTRO
#include <libxml/tree.h>
struct interfaces {
struct interfaces *next;
char *dbus_interface;
xmlNodePtr interface_node;
};
#endif /* CONFIG_CTRL_IFACE_DBUS_INTRO */
static void process_watch(struct ctrl_iface_dbus_new_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_new_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_new_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_new_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_new_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 *signal_ctx)
{
struct ctrl_iface_dbus_new_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_new_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_new_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_dbus_next_objid - Return next available object id
* @iface: dbus control interface private data
* Returns: Object id
*/
u32 wpa_dbus_next_objid(struct ctrl_iface_dbus_new_priv *iface)
{
return iface->next_objid++;
}
/**
* 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_new_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 service 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);
}
#ifdef CONFIG_CTRL_IFACE_DBUS_INTRO
/**
* extract_interfaces - Extract interfaces from methods, signals and props
* @obj_dsc: Description of object from which interfaces will be extracted
* @root_node: root node of XML introspection document
* Returns: List of interfaces found in object description
*
* Iterates over all methods, signals and properties registered with
* object and collects all declared DBus interfaces and create interface's
* node in XML root node for each. Returned list elements contains interface
* name and XML node of corresponding interface.
*/
static struct interfaces * extract_interfaces(
struct wpa_dbus_object_desc *obj_dsc, xmlNodePtr root_node)
{
struct wpa_dbus_method_desc *method_dsc = obj_dsc->methods;
struct wpa_dbus_signal_desc *signal_dsc = obj_dsc->signals;
struct wpa_dbus_property_desc *property_dsc = obj_dsc->properties;
struct interfaces *head = NULL;
struct interfaces *iface, *last;
int len;
/* extract interfaces from methods */
while (method_dsc) {
iface = head;
last = NULL;
/* go to next method if its interface is already extracted */
while (iface) {
if (!os_strcmp(iface->dbus_interface,
method_dsc->dbus_interface))
break;
last = iface;
iface = iface->next;
}
if (iface) {
method_dsc = method_dsc->next;
continue;
}
iface = os_zalloc(sizeof(struct interfaces));
if (!iface) {
wpa_printf(MSG_ERROR, "Not enough memory to create "
"interface introspection data");
method_dsc = method_dsc->next;
continue;
}
if (last)
last->next = iface;
else
head = iface;
len = os_strlen(method_dsc->dbus_interface) + 1;
iface->dbus_interface = os_malloc(len);
if (!iface->dbus_interface) {
wpa_printf(MSG_ERROR, "Not enough memory to create "
"interface introspection data (interface "
"name)");
method_dsc = method_dsc->next;
continue;
}
os_strncpy(iface->dbus_interface, method_dsc->dbus_interface,
len);
iface->interface_node = xmlNewChild(root_node, NULL,
BAD_CAST "interface",
NULL);
xmlNewProp(iface->interface_node, BAD_CAST "name",
BAD_CAST method_dsc->dbus_interface);
method_dsc = method_dsc->next;
}
/* extract interfaces from signals */
while (signal_dsc) {
iface = head;
last = NULL;
/* go to next signal if its interface is already extracted */
while (iface) {
if (!os_strcmp(iface->dbus_interface,
signal_dsc->dbus_interface))
break;
last = iface;
iface = iface->next;
}
if (iface) {
signal_dsc = signal_dsc->next;
continue;
}
iface = os_zalloc(sizeof(struct interfaces));
if (!iface) {
wpa_printf(MSG_ERROR, "Not enough memory to create "
"interface introspection data");
signal_dsc = signal_dsc->next;
continue;
}
if (last)
last->next = iface;
else
head = iface;
len = os_strlen(signal_dsc->dbus_interface) + 1;
iface->dbus_interface = os_malloc(len);
if (!iface->dbus_interface) {
wpa_printf(MSG_ERROR, "Not enough memory to create "
"interface introspection data (interface "
"name)");
signal_dsc = signal_dsc->next;
continue;
}
os_strncpy(iface->dbus_interface, signal_dsc->dbus_interface,
len);
iface->interface_node = xmlNewChild(root_node, NULL,
BAD_CAST "interface",
NULL);
xmlNewProp(iface->interface_node, BAD_CAST "name",
BAD_CAST signal_dsc->dbus_interface);
signal_dsc = signal_dsc->next;
}
/* extract interfaces from properties */
while (property_dsc) {
iface = head;
last = NULL;
/* go to next property if its interface is already extracted */
while (iface) {
if (!os_strcmp(iface->dbus_interface,
property_dsc->dbus_interface))
break;
last = iface;
iface = iface->next;
}
if (iface) {
property_dsc = property_dsc->next;
continue;
}
iface = os_zalloc(sizeof(struct interfaces));
if (!iface) {
wpa_printf(MSG_ERROR, "Not enough memory to create "
"interface introspection data");
property_dsc = property_dsc->next;
continue;
}
if (last)
last->next = iface;
else
head = iface;
len = os_strlen(property_dsc->dbus_interface) + 1;
iface->dbus_interface = os_malloc(len);
if (!iface->dbus_interface) {
wpa_printf(MSG_ERROR, "Not enough memory to create "
"interface introspection data (interface "
"name)");
property_dsc = property_dsc->next;
continue;
}
os_strncpy(iface->dbus_interface, property_dsc->dbus_interface,
len);
iface->interface_node = xmlNewChild(root_node, NULL,
BAD_CAST "interface",
NULL);
xmlNewProp(iface->interface_node, BAD_CAST "name",
BAD_CAST property_dsc->dbus_interface);
property_dsc = property_dsc->next;
}
return head;
}
/**
* introspect - Responds for Introspect calls on object
* @message: Message with Introspect call
* @obj_dsc: Object description on which Introspect was called
* Returns: Message with introspection result XML string as only argument
*
* Iterates over all methods, signals and properties registered with
* object and generates introspection data for the object as XML string.
*/
static DBusMessage * introspect(DBusMessage *message,
struct wpa_dbus_object_desc *obj_dsc)
{
DBusMessage *reply = NULL;
struct interfaces *ifaces, *tmp;
struct wpa_dbus_signal_desc *signal_dsc;
struct wpa_dbus_method_desc *method_dsc;
struct wpa_dbus_property_desc *property_dsc;
xmlChar *intro_str;
char **children;
int i, s;
xmlDocPtr doc = NULL;
xmlNodePtr root_node = NULL, node = NULL, iface_node = NULL;
xmlNodePtr method_node = NULL, signal_node = NULL;
xmlNodePtr property_node = NULL, arg_node = NULL;
/* Create and initialize the return message */
reply = dbus_message_new_method_return(message);
/* root node and dtd */
doc = xmlNewDoc(BAD_CAST "1.0");
root_node = xmlNewNode(NULL, BAD_CAST "node");
xmlDocSetRootElement(doc, root_node);
xmlCreateIntSubset(doc, BAD_CAST "node",
BAD_CAST DBUS_INTROSPECT_1_0_XML_PUBLIC_IDENTIFIER,
BAD_CAST DBUS_INTROSPECT_1_0_XML_SYSTEM_IDENTIFIER);
/* Add Introspectable interface */
iface_node = xmlNewChild(root_node, NULL, BAD_CAST "interface", NULL);
xmlNewProp(iface_node, BAD_CAST "name",
BAD_CAST WPA_DBUS_INTROSPECTION_INTERFACE);
/* Add Introspect method */
method_node = xmlNewChild(iface_node, NULL, BAD_CAST "method", NULL);
xmlNewProp(method_node, BAD_CAST "name",
BAD_CAST WPA_DBUS_INTROSPECTION_METHOD);
arg_node = xmlNewChild(method_node, NULL, BAD_CAST "arg", NULL);
xmlNewProp(arg_node, BAD_CAST "name", BAD_CAST "data");
xmlNewProp(arg_node, BAD_CAST "type", BAD_CAST "s");
xmlNewProp(arg_node, BAD_CAST "direction", BAD_CAST "out");
/* Add Properties interface */
iface_node = xmlNewChild(root_node, NULL,
BAD_CAST "interface", NULL);
xmlNewProp(iface_node, BAD_CAST "name",
BAD_CAST WPA_DBUS_PROPERTIES_INTERFACE);
/* Add Get method */
method_node = xmlNewChild(iface_node, NULL, BAD_CAST "method", NULL);
xmlNewProp(method_node, BAD_CAST "name",
BAD_CAST WPA_DBUS_PROPERTIES_GET);
arg_node = xmlNewChild(method_node, NULL, BAD_CAST "arg", NULL);
xmlNewProp(arg_node, BAD_CAST "name", BAD_CAST "interface");
xmlNewProp(arg_node, BAD_CAST "type", BAD_CAST "s");
xmlNewProp(arg_node, BAD_CAST "direction", BAD_CAST "in");
arg_node = xmlNewChild(method_node, NULL, BAD_CAST "arg", NULL);
xmlNewProp(arg_node, BAD_CAST "name", BAD_CAST "propname");
xmlNewProp(arg_node, BAD_CAST "type", BAD_CAST "s");
xmlNewProp(arg_node, BAD_CAST "direction", BAD_CAST "in");
arg_node = xmlNewChild(method_node, NULL, BAD_CAST "arg", NULL);
xmlNewProp(arg_node, BAD_CAST "name", BAD_CAST "value");
xmlNewProp(arg_node, BAD_CAST "type", BAD_CAST "v");
xmlNewProp(arg_node, BAD_CAST "direction", BAD_CAST "out");
method_node = xmlNewChild(iface_node, NULL, BAD_CAST "method", NULL);
/* Add GetAll method */
xmlNewProp(method_node, BAD_CAST "name",
BAD_CAST WPA_DBUS_PROPERTIES_GETALL);
arg_node = xmlNewChild(method_node, NULL, BAD_CAST "arg", NULL);
xmlNewProp(arg_node, BAD_CAST "name", BAD_CAST "interface");
xmlNewProp(arg_node, BAD_CAST "type", BAD_CAST "s");
xmlNewProp(arg_node, BAD_CAST "direction", BAD_CAST "in");
arg_node = xmlNewChild(method_node, NULL, BAD_CAST "arg", NULL);
xmlNewProp(arg_node, BAD_CAST "name", BAD_CAST "props");
xmlNewProp(arg_node, BAD_CAST "type", BAD_CAST "a{sv}");
xmlNewProp(arg_node, BAD_CAST "direction", BAD_CAST "out");
method_node = xmlNewChild(iface_node, NULL, BAD_CAST "method", NULL);
/* Add Set method */
xmlNewProp(method_node, BAD_CAST "name",
BAD_CAST WPA_DBUS_PROPERTIES_SET);
arg_node = xmlNewChild(method_node, NULL, BAD_CAST "arg", NULL);
xmlNewProp(arg_node, BAD_CAST "name", BAD_CAST "interface");
xmlNewProp(arg_node, BAD_CAST "type", BAD_CAST "s");
xmlNewProp(arg_node, BAD_CAST "direction", BAD_CAST "in");
arg_node = xmlNewChild(method_node, NULL, BAD_CAST "arg", NULL);
xmlNewProp(arg_node, BAD_CAST "name", BAD_CAST "propname");
xmlNewProp(arg_node, BAD_CAST "type", BAD_CAST "s");
xmlNewProp(arg_node, BAD_CAST "direction", BAD_CAST "in");
arg_node = xmlNewChild(method_node, NULL, BAD_CAST "arg", NULL);
xmlNewProp(arg_node, BAD_CAST "name", BAD_CAST "value");
xmlNewProp(arg_node, BAD_CAST "type", BAD_CAST "v");
xmlNewProp(arg_node, BAD_CAST "direction", BAD_CAST "in");
/* get all interfaces registered with object */
ifaces = extract_interfaces(obj_dsc, root_node);
/* create methods' nodes */
method_dsc = obj_dsc->methods;
while (method_dsc) {
struct interfaces *iface = ifaces;
while (iface) {
if (!os_strcmp(iface->dbus_interface,
method_dsc->dbus_interface))
break;
iface = iface->next;
}
if (!iface)
continue;
iface_node = iface->interface_node;
method_node = xmlNewChild(iface_node, NULL, BAD_CAST "method",
NULL);
xmlNewProp(method_node, BAD_CAST "name",
BAD_CAST method_dsc->dbus_method);
/* create args' nodes */
for (i = 0; i < method_dsc->args_num; i++) {
struct wpa_dbus_argument arg = method_dsc->args[i];
arg_node = xmlNewChild(method_node, NULL,
BAD_CAST "arg", NULL);
if (arg.name && strlen(arg.name)) {
xmlNewProp(arg_node, BAD_CAST "name",
BAD_CAST arg.name);
}
xmlNewProp(arg_node, BAD_CAST "type",
BAD_CAST arg.type);
xmlNewProp(arg_node, BAD_CAST "direction",
BAD_CAST (arg.dir == ARG_IN ?
"in" : "out"));
}
method_dsc = method_dsc->next;
}
/* create signals' nodes */
signal_dsc = obj_dsc->signals;
while (signal_dsc) {
struct interfaces *iface = ifaces;
while (iface) {
if (!os_strcmp(iface->dbus_interface,
signal_dsc->dbus_interface))
break;
iface = iface->next;
}
if (!iface)
continue;
iface_node = iface->interface_node;
signal_node = xmlNewChild(iface_node, NULL, BAD_CAST "signal",
NULL);
xmlNewProp(signal_node, BAD_CAST "name",
BAD_CAST signal_dsc->dbus_signal);
/* create args' nodes */
for (i = 0; i < signal_dsc->args_num; i++) {
struct wpa_dbus_argument arg = signal_dsc->args[i];
arg_node = xmlNewChild(signal_node, NULL,
BAD_CAST "arg", NULL);
if (arg.name && strlen(arg.name)) {
xmlNewProp(arg_node, BAD_CAST "name",
BAD_CAST arg.name);
}
xmlNewProp(arg_node, BAD_CAST "type",
BAD_CAST arg.type);
}
signal_dsc = signal_dsc->next;
}
/* create properties' nodes */
property_dsc = obj_dsc->properties;
while (property_dsc) {
struct interfaces *iface = ifaces;
while (iface) {
if (!os_strcmp(iface->dbus_interface,
property_dsc->dbus_interface))
break;
iface = iface->next;
}
if (!iface)
continue;
iface_node = iface->interface_node;
property_node = xmlNewChild(iface_node, NULL,
BAD_CAST "property", NULL);
xmlNewProp(property_node, BAD_CAST "name",
BAD_CAST property_dsc->dbus_property);
xmlNewProp(property_node, BAD_CAST "type",
BAD_CAST property_dsc->type);
xmlNewProp(property_node, BAD_CAST "access", BAD_CAST
(property_dsc->access == R ? "read" :
(property_dsc->access == W ?
"write" : "readwrite")));
property_dsc = property_dsc->next;
}
/* add child nodes to introspection tree; */
dbus_connection_list_registered(obj_dsc->connection,
dbus_message_get_path(message),
&children);
for (i = 0; children[i]; i++) {
node = xmlNewChild(root_node, NULL, BAD_CAST "node", NULL);
xmlNewProp(node, BAD_CAST "name", BAD_CAST children[i]);
}
dbus_free_string_array(children);
xmlDocDumpFormatMemory(doc, &intro_str, &s, 1);
xmlFreeDoc(doc);
while (ifaces) {
tmp = ifaces;
ifaces = ifaces->next;
os_free(tmp->dbus_interface);
os_free(tmp);
}
dbus_message_append_args(reply, DBUS_TYPE_STRING, &intro_str,
DBUS_TYPE_INVALID);
xmlFree(intro_str);
return reply;
}
#else /* CONFIG_CTRL_IFACE_DBUS_INTRO */
/**
* introspect - Responds for Introspect calls on object
* @message: Message with Introspect call
* @obj_dsc: Object description on which Introspect was called
* Returns: Message with introspection result XML string as only argument
*
* Returns error informing that introspection support was not compiled.
*/
static DBusMessage * introspect(DBusMessage *message,
struct wpa_dbus_object_desc *obj_dsc)
{
return dbus_message_new_error(message, DBUS_ERROR_UNKNOWN_METHOD,
"wpa_supplicant was compiled without "
"introspection support.");
}
#endif /* CONFIG_CTRL_IFACE_DBUS_INTRO */
/**
* recursive_iter_copy - Reads arguments from one iterator and
* writes to another recursively
* @from: iterator to read from
* @to: iterator to write to
*
* Copies one iterator's elements to another. If any element in
* iterator is of container type, its content is copied recursively
*/
static void recursive_iter_copy(DBusMessageIter *from, DBusMessageIter *to)
{
char *subtype = NULL;
int type;
/* iterate over iterator to copy */
while ((type = dbus_message_iter_get_arg_type (from)) !=
DBUS_TYPE_INVALID) {
/* simply copy basic type entries */
if (dbus_type_is_basic(type)) {
if (dbus_type_is_fixed(type)) {
/*
* According to DBus documentation all
* fixed-length types are guaranteed to fit
* 8 bytes
*/
dbus_uint64_t v;
dbus_message_iter_get_basic (from, &v);
dbus_message_iter_append_basic (to, type, &v);
} else {
char *v;
dbus_message_iter_get_basic (from, &v);
dbus_message_iter_append_basic (to, type, &v);
}
} else {
/* recursively copy container type entries */
DBusMessageIter write_subiter, read_subiter;
dbus_message_iter_recurse(from, &read_subiter);
if (type == DBUS_TYPE_VARIANT ||
type == DBUS_TYPE_ARRAY) {
subtype = dbus_message_iter_get_signature(
&read_subiter);
}
dbus_message_iter_open_container(to, type, subtype,
&write_subiter);
recursive_iter_copy(&read_subiter, &write_subiter);
dbus_message_iter_close_container(to, &write_subiter);
if (subtype)
dbus_free(subtype);
}
dbus_message_iter_next(from);
}
}
/**
* get_all_properties - Responds for GetAll properties calls on object
* @message: Message with GetAll call
* @interface: interface name which properties will be returned
* @property_dsc: list of object's properties
* Returns: Message with dict of variants as argument with properties values
*
* Iterates over all properties registered with object and execute getters
* of those, which are readable and which interface matches interface
* specified as argument. Returned message contains one dict argument
* with properties names as keys and theirs values as values.
*/
static DBusMessage * get_all_properties(
DBusMessage *message, char *interface,
struct wpa_dbus_property_desc *property_dsc)
{
/* Create and initialize the return message */
DBusMessage *reply = dbus_message_new_method_return(message);
DBusMessage *getterReply = NULL;
DBusMessageIter iter, dict_iter, entry_iter, ret_iter;
int counter = 0;
dbus_message_iter_init_append(reply, &iter);
dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY,
DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
DBUS_TYPE_STRING_AS_STRING
DBUS_TYPE_VARIANT_AS_STRING
DBUS_DICT_ENTRY_END_CHAR_AS_STRING,
&dict_iter);
while (property_dsc) {
if (!os_strncmp(property_dsc->dbus_interface, interface,
WPAS_DBUS_INTERFACE_MAX) &&
property_dsc->access != W && property_dsc->getter) {
getterReply = property_dsc->getter(
message, property_dsc->user_data);
dbus_message_iter_init(getterReply, &ret_iter);
dbus_message_iter_open_container(&dict_iter,
DBUS_TYPE_DICT_ENTRY,
NULL, &entry_iter);
dbus_message_iter_append_basic(
&entry_iter, DBUS_TYPE_STRING,
&(property_dsc->dbus_property));
recursive_iter_copy(&ret_iter, &entry_iter);
dbus_message_iter_close_container(&dict_iter,
&entry_iter);
dbus_message_unref(getterReply);
counter++;
}
property_dsc = property_dsc->next;
}
dbus_message_iter_close_container(&iter, &dict_iter);
if (counter == 0) {
dbus_message_unref(reply);
reply = dbus_message_new_error(message,
DBUS_ERROR_INVALID_ARGS,
"No readable properties in "
"this interface");
}
return reply;
}
static int is_signature_correct(DBusMessage *message,
struct wpa_dbus_method_desc *method_dsc)
{
/* According to DBus documentation max length of signature is 255 */
#define MAX_SIG_LEN 256
char registered_sig[MAX_SIG_LEN], *pos;
const char *sig = dbus_message_get_signature(message);
int i, ret;
pos = registered_sig;
*pos = '\0';
for (i = 0; i < method_dsc->args_num; i++) {
struct wpa_dbus_argument arg = method_dsc->args[i];
if (arg.dir == ARG_IN) {
size_t blen = registered_sig + MAX_SIG_LEN - pos;
ret = os_snprintf(pos, blen, "%s", arg.type);
if (ret < 0 || (size_t) ret >= blen)
return 0;
pos += ret;
}
}
return !os_strncmp(registered_sig, sig, MAX_SIG_LEN);
}
/**
* message_handler - Handles incoming DBus messages
* @connection: DBus connection on which message was received
* @message: Received message
* @user_data: pointer to description of object to which message was sent
* Returns: Returns information whether message was handled or not
*
* Reads message interface and method name, then checks if they matches one
* of the special cases i.e. introspection call or properties get/getall/set
* methods and handles it. Else it iterates over registered methods list
* and tries to match method's name and interface to those read from message
* If appropriate method was found it's handler function is called and
* response is sent. Otherwise the DBUS_ERROR_UNKNOWN_METHOD error message
* will be sent.
*/
static DBusHandlerResult message_handler(DBusConnection *connection,
DBusMessage *message, void *user_data)
{
struct wpa_dbus_object_desc *obj_dsc = user_data;
const char *method;
const char *path;
const char *msg_interface;
#define MESSAGE_UNHANDLED (DBusMessage *) 1
DBusMessage *reply = MESSAGE_UNHANDLED;
/* get method, interface and path the message is addressed to */
method = dbus_message_get_member(message);
path = dbus_message_get_path(message);
msg_interface = dbus_message_get_interface(message);
if (!method || !path || !msg_interface)
goto out;
/* if message is introspection method call */
if (!os_strncmp(WPA_DBUS_INTROSPECTION_METHOD, method,
WPAS_DBUS_METHOD_SIGNAL_PROP_MAX) &&
!os_strncmp(WPA_DBUS_INTROSPECTION_INTERFACE, msg_interface,
WPAS_DBUS_INTERFACE_MAX))
reply = introspect(message, obj_dsc);
else if (!strncmp(WPA_DBUS_PROPERTIES_INTERFACE, msg_interface,
WPAS_DBUS_INTERFACE_MAX)) {
/* if message is properties method call */
DBusMessageIter iter;
char *interface;
char *property;
dbus_message_iter_init(message, &iter);
if (!os_strncmp(WPA_DBUS_PROPERTIES_GET, method,
WPAS_DBUS_METHOD_SIGNAL_PROP_MAX) ||
!os_strncmp(WPA_DBUS_PROPERTIES_SET, method,
WPAS_DBUS_METHOD_SIGNAL_PROP_MAX) ||
!os_strncmp(WPA_DBUS_PROPERTIES_GETALL, method,
WPAS_DBUS_METHOD_SIGNAL_PROP_MAX)) {
/* First argument: interface name (DBUS_TYPE_STRING) */
if (dbus_message_iter_get_arg_type(&iter) !=
DBUS_TYPE_STRING) {
reply = dbus_message_new_error(
message, DBUS_ERROR_INVALID_ARGS,
NULL);
goto out;
}
dbus_message_iter_get_basic(&iter, &interface);
/* GetAll */
if (!os_strncmp(WPA_DBUS_PROPERTIES_GETALL, method,
WPAS_DBUS_METHOD_SIGNAL_PROP_MAX)) {
if (os_strcmp(dbus_message_get_signature(
message), "s"))
reply = dbus_message_new_error(
message,
DBUS_ERROR_INVALID_ARGS, NULL);
else
reply = get_all_properties(
message, interface,
obj_dsc->properties);
} else {
/* Get or Set */
struct wpa_dbus_property_desc *property_dsc;
property_dsc = obj_dsc->properties;
/* Second argument: property name
* (DBUS_TYPE_STRING) */
if (!dbus_message_iter_next(&iter) ||
dbus_message_iter_get_arg_type(&iter) !=
DBUS_TYPE_STRING) {
reply = dbus_message_new_error(
message,
DBUS_ERROR_INVALID_ARGS, NULL);
goto out;
}
dbus_message_iter_get_basic(&iter, &property);
while (property_dsc) {
/* compare property names and
* interfaces */
if (!os_strncmp(property_dsc->dbus_property,
property,
WPAS_DBUS_METHOD_SIGNAL_PROP_MAX) &&
!os_strncmp(property_dsc->dbus_interface, interface,
WPAS_DBUS_INTERFACE_MAX))
break;
property_dsc = property_dsc->next;
}
if (property_dsc) {
/* Get */
if (!os_strncmp(WPA_DBUS_PROPERTIES_GET, method,
WPAS_DBUS_METHOD_SIGNAL_PROP_MAX)) {
if (os_strcmp(dbus_message_get_signature(message), "ss"))
reply = dbus_message_new_error(message,
DBUS_ERROR_INVALID_ARGS, NULL);
else if (property_dsc->access != W &&
property_dsc->getter)
reply = property_dsc->getter(message,
property_dsc->user_data);
else
reply = dbus_message_new_error(message,
DBUS_ERROR_INVALID_ARGS,
"Property is write-only");
} else {
/* Set */
if (os_strcmp(dbus_message_get_signature(message), "ssv"))
reply = dbus_message_new_error(message,
DBUS_ERROR_INVALID_ARGS, NULL);
else if (property_dsc->access != R &&
property_dsc->setter) {
reply = property_dsc->setter
(message, property_dsc->user_data);
} else {
reply = dbus_message_new_error(message,
DBUS_ERROR_INVALID_ARGS,
"Property is read-only");
}
}
} else {
wpa_printf(MSG_DEBUG, "no property handler for %s.%s\n"
"on %s", interface, property, path);
reply = dbus_message_new_error(message,
DBUS_ERROR_INVALID_ARGS,
"No such property");
}
}
} else {
reply = dbus_message_new_error(
message, DBUS_ERROR_UNKNOWN_METHOD, NULL);
goto out;
}
} else {
struct wpa_dbus_method_desc *method_dsc = obj_dsc->methods;
/* try match call to any registered method */
while (method_dsc) {
/* compare method names and interfaces */
if (!os_strncmp(method_dsc->dbus_method, method,
WPAS_DBUS_METHOD_SIGNAL_PROP_MAX) &&
!os_strncmp(method_dsc->dbus_interface,
msg_interface,
WPAS_DBUS_INTERFACE_MAX))
break;
method_dsc = method_dsc->next;
}
if (method_dsc) {
if (is_signature_correct(message, method_dsc)) {
reply = method_dsc->method_handler(
message, method_dsc->handler_argument);
} else {
reply = dbus_message_new_error(
message, DBUS_ERROR_INVALID_ARGS,
NULL);
}
} else {
wpa_printf(MSG_DEBUG, "no method handler for %s.%s "
"on %s", msg_interface, method, path);
reply = dbus_message_new_error(
message, DBUS_ERROR_UNKNOWN_METHOD, NULL);
}
}
out:
/* If the message was handled, send back the reply */
if (reply != MESSAGE_UNHANDLED) {
/* If handler succeed returning NULL, reply empty message */
if (!reply)
reply = dbus_message_new_method_return(message);
if (reply) {
if (!dbus_message_get_no_reply(message))
dbus_connection_send(connection, reply, NULL);
dbus_message_unref(reply);
}
return DBUS_HANDLER_RESULT_HANDLED;
} else
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
/**
* free_dbus_object_desc - Frees object description data structure
* @connection: DBus connection
* @obj_dsc: Object description to free
*
* Frees each of properties, methods and signals description lists and
* the object description structure itself.
*/
void free_dbus_object_desc(struct wpa_dbus_object_desc *obj_dsc)
{
struct wpa_dbus_method_desc *method_dsc, *tmp_met_dsc;
struct wpa_dbus_signal_desc *signal_dsc, *tmp_sig_dsc;
struct wpa_dbus_property_desc *property_dsc, *tmp_prop_dsc;
int i;
if (!obj_dsc)
return;
/* free methods */
method_dsc = obj_dsc->methods;
while (method_dsc) {
tmp_met_dsc = method_dsc;
method_dsc = method_dsc->next;
os_free(tmp_met_dsc->dbus_interface);
os_free(tmp_met_dsc->dbus_method);
for (i = 0; i < tmp_met_dsc->args_num; i++) {
os_free(tmp_met_dsc->args[i].name);
os_free(tmp_met_dsc->args[i].type);
}
if (tmp_met_dsc->argument_free_func)
tmp_met_dsc->argument_free_func(
tmp_met_dsc->handler_argument);
os_free(tmp_met_dsc);
}
/* free signals */
signal_dsc = obj_dsc->signals;
while (signal_dsc) {
tmp_sig_dsc = signal_dsc;
signal_dsc = signal_dsc->next;
os_free(tmp_sig_dsc->dbus_interface);
os_free(tmp_sig_dsc->dbus_signal);
for (i = 0; i < tmp_sig_dsc->args_num; i++) {
os_free(tmp_sig_dsc->args[i].name);
os_free(tmp_sig_dsc->args[i].type);
}
os_free(tmp_sig_dsc);
}
/* free properties */
property_dsc = obj_dsc->properties;
while (property_dsc) {
tmp_prop_dsc = property_dsc;
property_dsc = property_dsc->next;
os_free(tmp_prop_dsc->dbus_interface);
os_free(tmp_prop_dsc->dbus_property);
os_free(tmp_prop_dsc->type);
if (tmp_prop_dsc->user_data_free_func)
tmp_prop_dsc->user_data_free_func(
tmp_prop_dsc->user_data);
os_free(tmp_prop_dsc);
}
os_free(obj_dsc);
}
static void free_dbus_object_desc_cb(DBusConnection *connection, void *obj_dsc)
{
free_dbus_object_desc(obj_dsc);
}
/**
* wpa_dbus_ctrl_iface_init - Initialize dbus control interface
* @application_data: Pointer to application specific data structure
* @dbus_path: DBus path to interface object
* @dbus_service: DBus service name to register with
* @messageHandler: a pointer to function which will handle dbus messages
* coming on interface
* Returns: Pointer to dbus_new_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_new_priv *
wpa_dbus_ctrl_iface_init(void *application_data,
char *dbus_path, char *dbus_service,
struct wpa_dbus_object_desc *obj_desc)
{
struct ctrl_iface_dbus_new_priv *iface;
DBusError error;
int ret = -1;
DBusObjectPathVTable wpa_vtable = {
&free_dbus_object_desc_cb, &message_handler,
NULL, NULL, NULL, NULL
};
iface = os_zalloc(sizeof(struct ctrl_iface_dbus_new_priv));
if (iface == NULL)
return NULL;
iface->application_data = application_data;
/* 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;
}
obj_desc->connection = iface->con;
/* 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,
dbus_path, &wpa_vtable,
obj_desc)) {
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, 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 '%s'.", 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
* 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_dbus_ctrl_iface_deinit(iface);
return NULL;
}
/**
* wpa_dbus_ctrl_iface_deinit - Deinitialize dbus ctrl interface
* @iface: Pointer to dbus private data from wpa_dbus_ctrl_iface_init()
*
* Deinitialize the dbus control interface that was initialized with
* wpa_dbus_ctrl_iface_init().
*/
void wpa_dbus_ctrl_iface_deinit(struct ctrl_iface_dbus_new_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);
}
os_memset(iface, 0, sizeof(struct ctrl_iface_dbus_new_priv));
os_free(iface);
}
/**
* wpa_dbus_register_object_per_iface - Register a new object with dbus
* @ctrl_iface: pointer to dbus private data
* @path: DBus path to object
* @ifname: interface name
* @obj_desc: description of object's methods, signals and properties
* Returns: 0 on success, -1 on error
*
* Registers a new interface with dbus and assigns it a dbus object path.
*/
int wpa_dbus_register_object_per_iface(
struct ctrl_iface_dbus_new_priv *ctrl_iface,
const char *path, const char *ifname,
struct wpa_dbus_object_desc *obj_desc)
{
DBusConnection *con;
DBusObjectPathVTable vtable = {
&free_dbus_object_desc_cb, &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;
obj_desc->connection = con;
/* Register the message handler for the interface functions */
if (!dbus_connection_register_object_path(con, path, &vtable,
obj_desc)) {
perror("wpa_dbus_register_iface [dbus]");
wpa_printf(MSG_ERROR, "Could not set up DBus message "
"handler for interface %s\n"
"and object %s.", ifname, path);
return -1;
}
return 0;
}
/**
* wpa_dbus_unregister_object_per_iface - Unregisters DBus object
* @ctrl_iface: Pointer to dbus private data
* @path: DBus path to object which will be unregistered
* Returns: Zero on success and -1 on failure
*
* Unregisters DBus object given by its path
*/
int wpa_dbus_unregister_object_per_iface(
struct ctrl_iface_dbus_new_priv *ctrl_iface, const char *path)
{
DBusConnection *con = ctrl_iface->con;
if (!dbus_connection_unregister_object_path(con, path))
return -1;
return 0;
}
/**
* wpa_dbus_method_register - Registers DBus method for given object
* @obj_dsc: Object description for which a method will be registered
* @dbus_interface: DBus interface under which method will be registered
* @dbus_method: a name the method will be registered with
* @method_handler: a function which will be called to handle this method call
* @handler_argument: an additional argument passed to handler function
* @argument_free_func: function used to free handler argument
* @args: method arguments list
* Returns: Zero on success and -1 on failure
*
* Registers DBus method under given name and interface for the object.
* Method calls will be handled with given handling function and optional
* argument passed to this function. Handler function is required to return
* a DBusMessage pointer which will be response to method call. Any method
* call before being handled must have registered appropriate handler by
* using this function.
*/
int wpa_dbus_method_register(struct wpa_dbus_object_desc *obj_dsc,
const char *dbus_interface,
const char *dbus_method,
WPADBusMethodHandler method_handler,
void *handler_argument,
WPADBusArgumentFreeFunction argument_free_func,
const struct wpa_dbus_argument args[])
{
struct wpa_dbus_method_desc *method_dsc = obj_dsc->methods;
struct wpa_dbus_method_desc *prev_desc;
int args_num = 0;
int interface_len, method_len, i, len, error;
prev_desc = NULL;
while (method_dsc) {
prev_desc = method_dsc;
method_dsc = method_dsc->next;
}
/* count args */
if (args) {
while (args[args_num].name && args[args_num].type)
args_num++;
}
method_dsc = os_zalloc(sizeof(struct wpa_dbus_method_desc) +
args_num * sizeof(struct wpa_dbus_argument));
if (!method_dsc)
goto err;
if (prev_desc == NULL)
obj_dsc->methods = method_dsc;
else
prev_desc->next = method_dsc;
/* copy interface name */
interface_len = os_strlen(dbus_interface) + 1;
method_dsc->dbus_interface = os_malloc(interface_len);
if (!method_dsc->dbus_interface)
goto err;
os_strncpy(method_dsc->dbus_interface, dbus_interface, interface_len);
/* copy method name */
method_len = os_strlen(dbus_method) + 1;
method_dsc->dbus_method = os_malloc(method_len);
if (!method_dsc->dbus_method)
goto err;
os_strncpy(method_dsc->dbus_method, dbus_method, method_len);
/* copy arguments */
error = 0;
method_dsc->args_num = args_num;
for (i = 0; i < args_num; i++) {
len = os_strlen(args[i].name) + 1;
method_dsc->args[i].name = os_malloc(len);
if (!method_dsc->args[i].name) {
error = 1;
continue;
}
os_strncpy(method_dsc->args[i].name, args[i].name, len);
len = os_strlen(args[i].type) + 1;
method_dsc->args[i].type = os_malloc(len);
if (!method_dsc->args[i].type) {
error = 1;
continue;
}
os_strncpy(method_dsc->args[i].type, args[i].type, len);
method_dsc->args[i].dir = args[i].dir;
}
if (error)
goto err;
method_dsc->method_handler = method_handler;
method_dsc->handler_argument = handler_argument;
method_dsc->argument_free_func = argument_free_func;
method_dsc->next = NULL;
return 0;
err:
wpa_printf(MSG_WARNING, "Failed to register dbus method %s in "
"interface %s", dbus_method, dbus_interface);
if (method_dsc) {
os_free(method_dsc->dbus_interface);
os_free(method_dsc->dbus_method);
for (i = 0; i < method_dsc->args_num; i++) {
os_free(method_dsc->args[i].name);
os_free(method_dsc->args[i].type);
}
if (prev_desc == NULL)
obj_dsc->methods = NULL;
else
prev_desc->next = NULL;
os_free(method_dsc);
}
return -1;
}
/**
* wpa_dbus_signal_register - Registers DBus signal for given object
* @obj_dsc: Object description for which a signal will be registered
* @dbus_interface: DBus interface under which signal will be registered
* @dbus_signal: a name the signal will be registered with
* @args: signal arguments list
* Returns: Zero on success and -1 on failure
*
* Registers DBus signal under given name and interface for the object.
* Signal registration is NOT required in order to send signals, but not
* registered signals will not be respected in introspection data
* therefore it is highly recommended to register every signal before
* using it.
*/
int wpa_dbus_signal_register(struct wpa_dbus_object_desc *obj_dsc,
const char *dbus_interface,
const char *dbus_signal,
const struct wpa_dbus_argument args[])
{
struct wpa_dbus_signal_desc *signal_dsc = obj_dsc->signals;
struct wpa_dbus_signal_desc *prev_desc;
int args_num = 0;
int interface_len, signal_len, i, len, error = 0;
prev_desc = NULL;
while (signal_dsc) {
prev_desc = signal_dsc;
signal_dsc = signal_dsc->next;
}
/* count args */
if (args) {
while (args[args_num].name && args[args_num].type)
args_num++;
}
signal_dsc = os_zalloc(sizeof(struct wpa_dbus_signal_desc) +
args_num * sizeof(struct wpa_dbus_argument));
if (!signal_dsc)
goto err;
if (prev_desc == NULL)
obj_dsc->signals = signal_dsc;
else
prev_desc->next = signal_dsc;
/* copy interface name */
interface_len = strlen(dbus_interface) + 1;
signal_dsc->dbus_interface = os_malloc(interface_len);
if (!signal_dsc->dbus_interface)
goto err;
os_strncpy(signal_dsc->dbus_interface, dbus_interface, interface_len);
/* copy signal name */
signal_len = strlen(dbus_signal) + 1;
signal_dsc->dbus_signal = os_malloc(signal_len);
if (!signal_dsc->dbus_signal)
goto err;
os_strncpy(signal_dsc->dbus_signal, dbus_signal, signal_len);
/* copy arguments */
signal_dsc->args_num = args_num;
for (i = 0; i < args_num; i++) {
len = os_strlen(args[i].name) + 1;
signal_dsc->args[i].name = os_malloc(len);
if (!signal_dsc->args[i].name) {
error = 1;
continue;
}
os_strncpy(signal_dsc->args[i].name, args[i].name, len);
len = strlen(args[i].type) + 1;
signal_dsc->args[i].type = os_malloc(len);
if (!signal_dsc->args[i].type) {
error = 1;
continue;
}
os_strncpy(signal_dsc->args[i].type, args[i].type, len);
}
if (error)
goto err;
signal_dsc->next = NULL;
return 0;
err:
wpa_printf(MSG_WARNING, "Failed to register dbus signal %s in "
"interface %s", dbus_signal, dbus_interface);
if (signal_dsc) {
os_free(signal_dsc->dbus_interface);
os_free(signal_dsc->dbus_signal);
for (i = 0; i < signal_dsc->args_num; i++) {
os_free(signal_dsc->args[i].name);
os_free(signal_dsc->args[i].type);
}
if (prev_desc == NULL)
obj_dsc->signals = NULL;
else
prev_desc->next = NULL;
os_free(signal_dsc);
}
return -1;
}
/**
* wpa_dbus_property_register - Registers DBus property for given object
* @obj_dsc: Object description for which a property will be registered
* @dbus_interface: DBus interface under which method will be registered
* @dbus_property: a name the property will be registered with
* @type: a property type signature in form of DBus type description
* @getter: a function called in order to get property value
* @setter: a function called in order to set property value
* @user_data: additional argument passed to setter or getter
* @user_data_free_func: function used to free additional argument
* @access: property access permissions specifier (R, W or RW)
* Returns: Zero on success and -1 on failure
*
* Registers DBus property under given name and interface for the object.
* Property are set with giver setter function and get with getter.
* Additional argument is passed to getter or setter. Getter or setter
* are required to return DBusMessage which is response to Set/Get method
* calls. Every property must be registered by this function before being
* used.
*/
int wpa_dbus_property_register(struct wpa_dbus_object_desc *obj_dsc,
const char *dbus_interface,
const char *dbus_property,
const char *type,
WPADBusPropertyAccessor getter,
WPADBusPropertyAccessor setter,
void *user_data,
WPADBusArgumentFreeFunction user_data_free_func,
enum dbus_prop_access _access)
{
struct wpa_dbus_property_desc *property_dsc = obj_dsc->properties;
struct wpa_dbus_property_desc *prev_desc;
int interface_len, property_len, type_len;
prev_desc = NULL;
while (property_dsc) {
prev_desc = property_dsc;
property_dsc = property_dsc->next;
}
property_dsc = os_zalloc(sizeof(struct wpa_dbus_property_desc));
if (!property_dsc)
goto err;
if (prev_desc == NULL)
obj_dsc->properties = property_dsc;
else
prev_desc->next = property_dsc;
/* copy interface name */
interface_len = os_strlen(dbus_interface) + 1;
property_dsc->dbus_interface = os_malloc(interface_len);
if (!property_dsc->dbus_interface)
goto err;
os_strncpy(property_dsc->dbus_interface, dbus_interface,
interface_len);
/* copy property name */
property_len = os_strlen(dbus_property) + 1;
property_dsc->dbus_property = os_malloc(property_len);
if (!property_dsc->dbus_property)
goto err;
os_strncpy(property_dsc->dbus_property, dbus_property, property_len);
/* copy property type */
type_len = os_strlen(type) + 1;
property_dsc->type = os_malloc(type_len);
if (!property_dsc->type)
goto err;
os_strncpy(property_dsc->type, type, type_len);
property_dsc->getter = getter;
property_dsc->setter = setter;
property_dsc->user_data = user_data;
property_dsc->user_data_free_func = user_data_free_func;
property_dsc->access = _access;
property_dsc->next = NULL;
return 0;
err:
wpa_printf(MSG_WARNING, "Failed to register dbus property %s in "
"interface %s", dbus_property, dbus_interface);
if (property_dsc) {
os_free(property_dsc->dbus_interface);
os_free(property_dsc->dbus_property);
os_free(property_dsc->type);
if (prev_desc == NULL)
obj_dsc->properties = NULL;
else
prev_desc->next = NULL;
os_free(property_dsc);
}
return -1;
}
/**
* wpas_dbus_signal_network_added - Send a property changed signal
* @iface: dbus priv struct
* @property_getter: propperty getter used to fetch new property value
* @getter_arg: argument passed to property getter
* @path: path to object which property has changed
* @interface_name: signal and property interface
* @property_name: name of property which has changed
*
* Notify listeners about changing value of some property. Signal
* contains property name and its value fetched using given property
* getter.
*/
void wpa_dbus_signal_property_changed(struct ctrl_iface_dbus_new_priv *iface,
WPADBusPropertyAccessor property_getter,
void *getter_arg,
const char *path,
const char *interface_name,
const char *property_name)
{
DBusConnection *connection;
DBusMessage *_signal, *getter_reply;
DBusMessageIter prop_iter, signal_iter, dict_iter, entry_iter;
if (!iface)
return;
connection = iface->con;
if (!property_getter) {
wpa_printf(MSG_ERROR, "wpa_dbus_signal_property_changed"
"[dbus]: property getter not specified");
return;
}
if (!path || !interface_name || !property_name) {
wpa_printf(MSG_ERROR, "wpa_dbus_signal_property_changed"
"[dbus]: path interface of property not specified");
return;
}
getter_reply = property_getter(NULL, getter_arg);
if (!getter_reply ||
dbus_message_get_type(getter_reply) == DBUS_MESSAGE_TYPE_ERROR) {
wpa_printf(MSG_ERROR, "wpa_dbus_signal_property_changed"
"[dbus]: cannot get new value of property %s",
property_name);
return;
}
_signal = dbus_message_new_signal(path, interface_name,
"PropertiesChanged");
if (!_signal) {
wpa_printf(MSG_ERROR, "wpa_dbus_signal_property_changed"
"[dbus]: cannot allocate signal");
dbus_message_unref(getter_reply);
return;
}
dbus_message_iter_init(getter_reply, &prop_iter);
dbus_message_iter_init_append(_signal, &signal_iter);
if (!dbus_message_iter_open_container(&signal_iter, DBUS_TYPE_ARRAY,
"{sv}", &dict_iter)) {
wpa_printf(MSG_ERROR, "wpa_dbus_signal_property_changed"
"[dbus]: out of memory. cannot open dictionary");
goto err;
}
if (!dbus_message_iter_open_container(&dict_iter, DBUS_TYPE_DICT_ENTRY,
NULL, &entry_iter)) {
wpa_printf(MSG_ERROR, "iwpa_dbus_signal_property_changed"
"[dbus]: out of memory. cannot open dictionary "
"element");
goto err;
}
if (!dbus_message_iter_append_basic(&entry_iter, DBUS_TYPE_STRING,
&property_name)) {
wpa_printf(MSG_ERROR, "wpa_dbus_signal_property_changed"
"[dbus]: out of memory. cannot open add property "
"name");
goto err;
}
recursive_iter_copy(&prop_iter, &entry_iter);
if (!dbus_message_iter_close_container(&dict_iter, &entry_iter)) {
wpa_printf(MSG_ERROR, "wpa_dbus_signal_property_changed"
"[dbus]: out of memory. cannot close dictionary "
"element");
goto err;
}
if (!dbus_message_iter_close_container(&signal_iter, &dict_iter)) {
wpa_printf(MSG_ERROR, "wpa_dbus_signal_property_changed"
"[dbus]: out of memory. cannot close dictionary");
goto err;
}
dbus_connection_send(connection, _signal, NULL);
err:
dbus_message_unref(getter_reply);
dbus_message_unref(_signal);
}
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