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hostapd/wpa_supplicant/dbus/dbus_new_introspect.c
Jouni Malinen de7a79ceb6 dbus: Cleanup and fix loops 
Simpler to use for loops instead of handling next pointer selection
in all places. In addition, couple of functions could have ended up
in an infinite loop on error path since the pointer update was missed.
2010-01-01 14:25:25 +02:00

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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 "utils/includes.h"
#include <libxml/tree.h>
#include "utils/common.h"
#include "dbus_common_i.h"
#include "dbus_new_helpers.h"
struct interfaces {
struct interfaces *next;
char *dbus_interface;
xmlNodePtr interface_node;
};
/**
* 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;
struct wpa_dbus_signal_desc *signal_dsc;
struct wpa_dbus_property_desc *property_dsc;
struct interfaces *head = NULL;
struct interfaces *iface, *last;
/* extract interfaces from methods */
for (method_dsc = obj_dsc->methods; method_dsc;
method_dsc = method_dsc->next) {
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)
continue;
iface = os_zalloc(sizeof(struct interfaces));
if (!iface)
continue;
if (last)
last->next = iface;
else
head = iface;
iface->dbus_interface = os_strdup(method_dsc->dbus_interface);
if (!iface->dbus_interface)
continue;
iface->interface_node = xmlNewChild(root_node, NULL,
BAD_CAST "interface",
NULL);
xmlNewProp(iface->interface_node, BAD_CAST "name",
BAD_CAST method_dsc->dbus_interface);
}
/* extract interfaces from signals */
for (signal_dsc = obj_dsc->signals; signal_dsc;
signal_dsc = signal_dsc->next) {
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)
continue;
iface = os_zalloc(sizeof(struct interfaces));
if (!iface)
continue;
if (last)
last->next = iface;
else
head = iface;
iface->dbus_interface = os_strdup(signal_dsc->dbus_interface);
if (!iface->dbus_interface)
continue;
iface->interface_node = xmlNewChild(root_node, NULL,
BAD_CAST "interface",
NULL);
xmlNewProp(iface->interface_node, BAD_CAST "name",
BAD_CAST signal_dsc->dbus_interface);
}
/* extract interfaces from properties */
for (property_dsc = obj_dsc->properties; property_dsc;
property_dsc = property_dsc->next) {
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)
continue;
iface = os_zalloc(sizeof(struct interfaces));
if (!iface)
continue;
if (last)
last->next = iface;
else
head = iface;
iface->dbus_interface =
os_strdup(property_dsc->dbus_interface);
if (!iface->dbus_interface)
continue;
iface->interface_node = xmlNewChild(root_node, NULL,
BAD_CAST "interface",
NULL);
xmlNewProp(iface->interface_node, BAD_CAST "name",
BAD_CAST property_dsc->dbus_interface);
}
return head;
}
/**
* wpa_dbus_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.
*/
DBusMessage * wpa_dbus_introspect(DBusMessage *message,
struct wpa_dbus_object_desc *obj_dsc)
{
DBusMessage *reply;
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;
/* 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 */
for (method_dsc = obj_dsc->methods; method_dsc;
method_dsc = method_dsc->next) {
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"));
}
}
/* create signals' nodes */
for (signal_dsc = obj_dsc->signals; signal_dsc;
signal_dsc = signal_dsc->next) {
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);
}
}
/* create properties' nodes */
for (property_dsc = obj_dsc->properties; property_dsc;
property_dsc = property_dsc->next) {
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")));
}
/* 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);
}
reply = dbus_message_new_method_return(message);
if (reply == NULL) {
xmlFree(intro_str);
return NULL;
}
dbus_message_append_args(reply, DBUS_TYPE_STRING, &intro_str,
DBUS_TYPE_INVALID);
xmlFree(intro_str);
return reply;
}
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