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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "bus-internal.h"
#include "bus-introspect.h"
#include "bus-objects.h"
#include "bus-protocol.h"
#include "bus-signature.h"
#include "fd-util.h"
#include "fileio.h"
#include "memory-util.h"
#include "string-util.h"
#define BUS_INTROSPECT_DOCTYPE \
"<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\"\n" \
"\"https://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
#define BUS_INTROSPECT_INTERFACE_PEER \
" <interface name=\"org.freedesktop.DBus.Peer\">\n" \
" <method name=\"Ping\"/>\n" \
" <method name=\"GetMachineId\">\n" \
" <arg type=\"s\" name=\"machine_uuid\" direction=\"out\"/>\n" \
" </method>\n" \
" </interface>\n"
#define BUS_INTROSPECT_INTERFACE_INTROSPECTABLE \
" <interface name=\"org.freedesktop.DBus.Introspectable\">\n" \
" <method name=\"Introspect\">\n" \
" <arg name=\"xml_data\" type=\"s\" direction=\"out\"/>\n" \
" </method>\n" \
" </interface>\n"
#define BUS_INTROSPECT_INTERFACE_PROPERTIES \
" <interface name=\"org.freedesktop.DBus.Properties\">\n" \
" <method name=\"Get\">\n" \
" <arg name=\"interface_name\" direction=\"in\" type=\"s\"/>\n" \
" <arg name=\"property_name\" direction=\"in\" type=\"s\"/>\n" \
" <arg name=\"value\" direction=\"out\" type=\"v\"/>\n" \
" </method>\n" \
" <method name=\"GetAll\">\n" \
" <arg name=\"interface_name\" direction=\"in\" type=\"s\"/>\n" \
" <arg name=\"props\" direction=\"out\" type=\"a{sv}\"/>\n" \
" </method>\n" \
" <method name=\"Set\">\n" \
" <arg name=\"interface_name\" direction=\"in\" type=\"s\"/>\n" \
" <arg name=\"property_name\" direction=\"in\" type=\"s\"/>\n" \
" <arg name=\"value\" direction=\"in\" type=\"v\"/>\n" \
" </method>\n" \
" <signal name=\"PropertiesChanged\">\n" \
" <arg type=\"s\" name=\"interface_name\"/>\n" \
" <arg type=\"a{sv}\" name=\"changed_properties\"/>\n" \
" <arg type=\"as\" name=\"invalidated_properties\"/>\n" \
" </signal>\n" \
" </interface>\n"
#define BUS_INTROSPECT_INTERFACE_OBJECT_MANAGER \
" <interface name=\"org.freedesktop.DBus.ObjectManager\">\n" \
" <method name=\"GetManagedObjects\">\n" \
" <arg type=\"a{oa{sa{sv}}}\" name=\"object_paths_interfaces_and_properties\" direction=\"out\"/>\n" \
" </method>\n" \
" <signal name=\"InterfacesAdded\">\n" \
" <arg type=\"o\" name=\"object_path\"/>\n" \
" <arg type=\"a{sa{sv}}\" name=\"interfaces_and_properties\"/>\n" \
" </signal>\n" \
" <signal name=\"InterfacesRemoved\">\n" \
" <arg type=\"o\" name=\"object_path\"/>\n" \
" <arg type=\"as\" name=\"interfaces\"/>\n" \
" </signal>\n" \
" </interface>\n"
int introspect_begin(struct introspect *i, bool trusted) {
assert(i);
*i = (struct introspect) {
.trusted = trusted,
};
i->f = open_memstream_unlocked(&i->introspection, &i->size);
if (!i->f)
return -ENOMEM;
fputs(BUS_INTROSPECT_DOCTYPE
"<node>\n", i->f);
return 0;
}
int introspect_write_default_interfaces(struct introspect *i, bool object_manager) {
assert(i);
fputs(BUS_INTROSPECT_INTERFACE_PEER
BUS_INTROSPECT_INTERFACE_INTROSPECTABLE
BUS_INTROSPECT_INTERFACE_PROPERTIES, i->f);
if (object_manager)
fputs(BUS_INTROSPECT_INTERFACE_OBJECT_MANAGER, i->f);
return 0;
}
static int set_interface_name(struct introspect *intro, const char *interface_name) {
if (streq_ptr(intro->interface_name, interface_name))
return 0;
if (intro->interface_name)
fputs(" </interface>\n", intro->f);
if (interface_name)
fprintf(intro->f, " <interface name=\"%s\">\n", interface_name);
return free_and_strdup(&intro->interface_name, interface_name);
}
int introspect_write_child_nodes(struct introspect *i, OrderedSet *s, const char *prefix) {
char *node;
assert(i);
assert(prefix);
assert_se(set_interface_name(i, NULL) >= 0);
while ((node = ordered_set_steal_first(s))) {
const char *e;
e = object_path_startswith(node, prefix);
if (e && e[0])
fprintf(i->f, " <node name=\"%s\"/>\n", e);
free(node);
}
return 0;
}
static void introspect_write_flags(struct introspect *i, int type, uint64_t flags) {
if (flags & SD_BUS_VTABLE_DEPRECATED)
fputs(" <annotation name=\"org.freedesktop.DBus.Deprecated\" value=\"true\"/>\n", i->f);
if (type == _SD_BUS_VTABLE_METHOD && (flags & SD_BUS_VTABLE_METHOD_NO_REPLY))
fputs(" <annotation name=\"org.freedesktop.DBus.Method.NoReply\" value=\"true\"/>\n", i->f);
if (IN_SET(type, _SD_BUS_VTABLE_PROPERTY, _SD_BUS_VTABLE_WRITABLE_PROPERTY)) {
if (flags & SD_BUS_VTABLE_PROPERTY_EXPLICIT)
fputs(" <annotation name=\"org.freedesktop.systemd1.Explicit\" value=\"true\"/>\n", i->f);
if (flags & SD_BUS_VTABLE_PROPERTY_CONST)
fputs(" <annotation name=\"org.freedesktop.DBus.Property.EmitsChangedSignal\" value=\"const\"/>\n", i->f);
else if (flags & SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION)
fputs(" <annotation name=\"org.freedesktop.DBus.Property.EmitsChangedSignal\" value=\"invalidates\"/>\n", i->f);
else if (!(flags & SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE))
fputs(" <annotation name=\"org.freedesktop.DBus.Property.EmitsChangedSignal\" value=\"false\"/>\n", i->f);
}
if (!i->trusted &&
IN_SET(type, _SD_BUS_VTABLE_METHOD, _SD_BUS_VTABLE_WRITABLE_PROPERTY) &&
!(flags & SD_BUS_VTABLE_UNPRIVILEGED))
fputs(" <annotation name=\"org.freedesktop.systemd1.Privileged\" value=\"true\"/>\n", i->f);
}
/* Note that "names" is both an input and an output parameter. It initially points to the first argument name in a
NULL-separated list of strings, and is then advanced with each argument, and the resulting pointer is returned. */
static int introspect_write_arguments(struct introspect *i, const char *signature, const char **names, const char *direction) {
int r;
for (;;) {
size_t l;
if (!*signature)
return 0;
r = signature_element_length(signature, &l);
if (r < 0)
return r;
fprintf(i->f, " <arg type=\"%.*s\"", (int) l, signature);
if (**names != '\0') {
fprintf(i->f, " name=\"%s\"", *names);
*names += strlen(*names) + 1;
}
if (direction)
fprintf(i->f, " direction=\"%s\"/>\n", direction);
else
fputs("/>\n", i->f);
signature += l;
}
}
int introspect_write_interface(
struct introspect *i,
const char *interface_name,
const sd_bus_vtable *v) {
const sd_bus_vtable *vtable = ASSERT_PTR(v);
const char *names = "";
int r;
assert(i);
assert(interface_name);
r = set_interface_name(i, interface_name);
if (r < 0)
return r;
for (; v->type != _SD_BUS_VTABLE_END; v = bus_vtable_next(vtable, v)) {
/* Ignore methods, signals and properties that are
* marked "hidden", but do show the interface
* itself */
if (v->type != _SD_BUS_VTABLE_START && (v->flags & SD_BUS_VTABLE_HIDDEN))
continue;
switch (v->type) {
case _SD_BUS_VTABLE_START:
if (v->flags & SD_BUS_VTABLE_DEPRECATED)
fputs(" <annotation name=\"org.freedesktop.DBus.Deprecated\" value=\"true\"/>\n", i->f);
break;
case _SD_BUS_VTABLE_METHOD:
fprintf(i->f, " <method name=\"%s\">\n", v->x.method.member);
if (bus_vtable_has_names(vtable))
names = strempty(v->x.method.names);
introspect_write_arguments(i, strempty(v->x.method.signature), &names, "in");
introspect_write_arguments(i, strempty(v->x.method.result), &names, "out");
introspect_write_flags(i, v->type, v->flags);
fputs(" </method>\n", i->f);
break;
case _SD_BUS_VTABLE_PROPERTY:
case _SD_BUS_VTABLE_WRITABLE_PROPERTY:
fprintf(i->f, " <property name=\"%s\" type=\"%s\" access=\"%s\">\n",
v->x.property.member,
v->x.property.signature,
v->type == _SD_BUS_VTABLE_WRITABLE_PROPERTY ? "readwrite" : "read");
introspect_write_flags(i, v->type, v->flags);
fputs(" </property>\n", i->f);
break;
case _SD_BUS_VTABLE_SIGNAL:
fprintf(i->f, " <signal name=\"%s\">\n", v->x.signal.member);
if (bus_vtable_has_names(vtable))
names = strempty(v->x.signal.names);
introspect_write_arguments(i, strempty(v->x.signal.signature), &names, NULL);
introspect_write_flags(i, v->type, v->flags);
fputs(" </signal>\n", i->f);
break;
}
}
return 0;
}
int introspect_finish(struct introspect *i, char **ret) {
int r;
assert(i);
assert_se(set_interface_name(i, NULL) >= 0);
fputs("</node>\n", i->f);
r = fflush_and_check(i->f);
if (r < 0)
return r;
i->f = safe_fclose(i->f);
*ret = TAKE_PTR(i->introspection);
return 0;
}
void introspect_free(struct introspect *i) {
assert(i);
/* Normally introspect_finish() does all the work, this is just a backup for error paths */
safe_fclose(i->f);
free(i->interface_name);
free(i->introspection);
}
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