Adding upstream version 252.22.upstream/252.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

5 files changed, 3712 insertions, 0 deletions

diff --git a/src/busctl/busctl-introspect.c b/src/busctl/busctl-introspect.c
new file mode 100644
index 0000000..6002af5
--- /dev/null
+++ b/src/busctl/busctl-introspect.c
@@ -0,0 +1,728 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "sd-bus.h"
+
+#include "alloc-util.h"
+#include "busctl-introspect.h"
+#include "path-util.h"
+#include "string-util.h"
+#include "util.h"
+#include "xml.h"
+
+#define NODE_DEPTH_MAX 16
+
+typedef struct Context {
+        const XMLIntrospectOps *ops;
+        void *userdata;
+
+        char *interface_name;
+        uint64_t interface_flags;
+
+        char *member_name;
+        char *member_signature;
+        char *member_result;
+        uint64_t member_flags;
+        bool member_writable;
+
+        const char *current;
+        void *xml_state;
+} Context;
+
+static void context_reset_member(Context *c) {
+        free(c->member_name);
+        free(c->member_signature);
+        free(c->member_result);
+
+        c->member_name = c->member_signature = c->member_result = NULL;
+        c->member_flags = 0;
+        c->member_writable = false;
+}
+
+static void context_reset_interface(Context *c) {
+        c->interface_name = mfree(c->interface_name);
+        c->interface_flags = 0;
+
+        context_reset_member(c);
+}
+
+static int parse_xml_annotation(Context *context, uint64_t *flags) {
+
+        enum {
+                STATE_ANNOTATION,
+                STATE_NAME,
+                STATE_VALUE
+        } state = STATE_ANNOTATION;
+
+        _cleanup_free_ char *field = NULL, *value = NULL;
+
+        assert(context);
+
+        for (;;) {
+                _cleanup_free_ char *name = NULL;
+
+                int t;
+
+                t = xml_tokenize(&context->current, &name, &context->xml_state, NULL);
+                if (t < 0) {
+                        log_error("XML parse error.");
+                        return t;
+                }
+
+                if (t == XML_END)
+                        return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
+                                               "Premature end of XML data.");
+
+                switch (state) {
+
+                case STATE_ANNOTATION:
+
+                        if (t == XML_ATTRIBUTE_NAME) {
+
+                                if (streq_ptr(name, "name"))
+                                        state = STATE_NAME;
+
+                                else if (streq_ptr(name, "value"))
+                                        state = STATE_VALUE;
+
+                                else
+                                        return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
+                                                               "Unexpected <annotation> attribute %s.",
+                                                               name);
+
+                        } else if (t == XML_TAG_CLOSE_EMPTY ||
+                                   (t == XML_TAG_CLOSE && streq_ptr(name, "annotation"))) {
+
+                                if (flags) {
+                                        if (streq_ptr(field, "org.freedesktop.DBus.Deprecated")) {
+
+                                                if (streq_ptr(value, "true"))
+                                                        *flags |= SD_BUS_VTABLE_DEPRECATED;
+
+                                        } else if (streq_ptr(field, "org.freedesktop.DBus.Method.NoReply")) {
+
+                                                if (streq_ptr(value, "true"))
+                                                        *flags |= SD_BUS_VTABLE_METHOD_NO_REPLY;
+
+                                        } else if (streq_ptr(field, "org.freedesktop.DBus.Property.EmitsChangedSignal")) {
+
+                                                if (streq_ptr(value, "const"))
+                                                        *flags = (*flags & ~(SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION|SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE)) | SD_BUS_VTABLE_PROPERTY_CONST;
+                                                else if (streq_ptr(value, "invalidates"))
+                                                        *flags = (*flags & ~(SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE|SD_BUS_VTABLE_PROPERTY_CONST)) | SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION;
+                                                else if (streq_ptr(value, "false"))
+                                                        *flags = *flags & ~(SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE|SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION);
+                                        }
+                                }
+
+                                return 0;
+
+                        } else if (t != XML_TEXT || !in_charset(name, WHITESPACE))
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in <annotation>. (1)");
+
+                        break;
+
+                case STATE_NAME:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                free_and_replace(field, name);
+
+                                state = STATE_ANNOTATION;
+                        } else
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in <annotation>. (2)");
+
+                        break;
+
+                case STATE_VALUE:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                free_and_replace(value, name);
+
+                                state = STATE_ANNOTATION;
+                        } else
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in <annotation>. (3)");
+
+                        break;
+
+                default:
+                        assert_not_reached();
+                }
+        }
+}
+
+static int parse_xml_node(Context *context, const char *prefix, unsigned n_depth) {
+
+        enum {
+                STATE_NODE,
+                STATE_NODE_NAME,
+                STATE_INTERFACE,
+                STATE_INTERFACE_NAME,
+                STATE_METHOD,
+                STATE_METHOD_NAME,
+                STATE_METHOD_ARG,
+                STATE_METHOD_ARG_NAME,
+                STATE_METHOD_ARG_TYPE,
+                STATE_METHOD_ARG_DIRECTION,
+                STATE_SIGNAL,
+                STATE_SIGNAL_NAME,
+                STATE_SIGNAL_ARG,
+                STATE_SIGNAL_ARG_NAME,
+                STATE_SIGNAL_ARG_TYPE,
+                STATE_SIGNAL_ARG_DIRECTION,
+                STATE_PROPERTY,
+                STATE_PROPERTY_NAME,
+                STATE_PROPERTY_TYPE,
+                STATE_PROPERTY_ACCESS,
+        } state = STATE_NODE;
+
+        _cleanup_free_ char *node_path = NULL, *argument_type = NULL, *argument_direction = NULL;
+        const char *np = ASSERT_PTR(prefix);
+        int r;
+
+        assert(context);
+
+        if (n_depth > NODE_DEPTH_MAX)
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "<node> depth too high.");
+
+        for (;;) {
+                _cleanup_free_ char *name = NULL;
+                int t;
+
+                t = xml_tokenize(&context->current, &name, &context->xml_state, NULL);
+                if (t < 0) {
+                        log_error("XML parse error.");
+                        return t;
+                }
+
+                if (t == XML_END)
+                        return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), "Premature end of XML data.");
+
+                switch (state) {
+
+                case STATE_NODE:
+                        if (t == XML_ATTRIBUTE_NAME) {
+
+                                if (streq_ptr(name, "name"))
+                                        state = STATE_NODE_NAME;
+                                else
+                                        return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
+                                                               "Unexpected <node> attribute %s.", name);
+
+                        } else if (t == XML_TAG_OPEN) {
+
+                                if (streq_ptr(name, "interface"))
+                                        state = STATE_INTERFACE;
+                                else if (streq_ptr(name, "node")) {
+
+                                        r = parse_xml_node(context, np, n_depth+1);
+                                        if (r < 0)
+                                                return r;
+                                } else
+                                        return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
+                                                               "Unexpected <node> tag %s.", name);
+
+                        } else if (t == XML_TAG_CLOSE_EMPTY ||
+                                   (t == XML_TAG_CLOSE && streq_ptr(name, "node"))) {
+
+                                if (context->ops->on_path) {
+                                        r = context->ops->on_path(node_path ?: np, context->userdata);
+                                        if (r < 0)
+                                                return r;
+                                }
+
+                                return 0;
+
+                        } else if (t != XML_TEXT || !in_charset(name, WHITESPACE))
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in <node>. (1)");
+
+                        break;
+
+                case STATE_NODE_NAME:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+
+                                free(node_path);
+
+                                if (name[0] == '/')
+                                        node_path = TAKE_PTR(name);
+                                else {
+                                        node_path = path_join(prefix, name);
+                                        if (!node_path)
+                                                return log_oom();
+                                }
+
+                                np = node_path;
+                                state = STATE_NODE;
+                        } else
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in <node>. (2)");
+
+                        break;
+
+                case STATE_INTERFACE:
+
+                        if (t == XML_ATTRIBUTE_NAME) {
+                                if (streq_ptr(name, "name"))
+                                        state = STATE_INTERFACE_NAME;
+                                else
+                                        return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
+                                                               "Unexpected <interface> attribute %s.",
+                                                               name);
+
+                        } else if (t == XML_TAG_OPEN) {
+                                if (streq_ptr(name, "method"))
+                                        state = STATE_METHOD;
+                                else if (streq_ptr(name, "signal"))
+                                        state = STATE_SIGNAL;
+                                else if (streq_ptr(name, "property")) {
+                                        context->member_flags |= SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE;
+                                        state = STATE_PROPERTY;
+                                } else if (streq_ptr(name, "annotation")) {
+                                        r = parse_xml_annotation(context, &context->interface_flags);
+                                        if (r < 0)
+                                                return r;
+                                } else
+                                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                               "Unexpected <interface> tag %s.", name);
+                        } else if (t == XML_TAG_CLOSE_EMPTY ||
+                                   (t == XML_TAG_CLOSE && streq_ptr(name, "interface"))) {
+
+                                if (n_depth == 0) {
+                                        if (context->ops->on_interface) {
+                                                r = context->ops->on_interface(context->interface_name, context->interface_flags, context->userdata);
+                                                if (r < 0)
+                                                        return r;
+                                        }
+
+                                        context_reset_interface(context);
+                                }
+
+                                state = STATE_NODE;
+
+                        } else if (t != XML_TEXT || !in_charset(name, WHITESPACE))
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in <interface>. (1)");
+
+                        break;
+
+                case STATE_INTERFACE_NAME:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                if (n_depth == 0)
+                                        free_and_replace(context->interface_name, name);
+
+                                state = STATE_INTERFACE;
+                        } else
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in <interface>. (2)");
+
+                        break;
+
+                case STATE_METHOD:
+
+                        if (t == XML_ATTRIBUTE_NAME) {
+                                if (streq_ptr(name, "name"))
+                                        state = STATE_METHOD_NAME;
+                                else
+                                        return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
+                                                               "Unexpected <method> attribute %s",
+                                                               name);
+                        } else if (t == XML_TAG_OPEN) {
+                                if (streq_ptr(name, "arg"))
+                                        state = STATE_METHOD_ARG;
+                                else if (streq_ptr(name, "annotation")) {
+                                        r = parse_xml_annotation(context, &context->member_flags);
+                                        if (r < 0)
+                                                return r;
+                                } else
+                                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                               "Unexpected <method> tag %s.",
+                                                               name);
+                        } else if (t == XML_TAG_CLOSE_EMPTY ||
+                                   (t == XML_TAG_CLOSE && streq_ptr(name, "method"))) {
+
+                                if (n_depth == 0) {
+                                        if (context->ops->on_method) {
+                                                r = context->ops->on_method(context->interface_name, context->member_name, context->member_signature, context->member_result, context->member_flags, context->userdata);
+                                                if (r < 0)
+                                                        return r;
+                                        }
+
+                                        context_reset_member(context);
+                                }
+
+                                state = STATE_INTERFACE;
+
+                        } else if (t != XML_TEXT || !in_charset(name, WHITESPACE))
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in <method> (1).");
+
+                        break;
+
+                case STATE_METHOD_NAME:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                if (n_depth == 0)
+                                        free_and_replace(context->member_name, name);
+
+                                state = STATE_METHOD;
+                        } else
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in <method> (2).");
+
+                        break;
+
+                case STATE_METHOD_ARG:
+
+                        if (t == XML_ATTRIBUTE_NAME) {
+                                if (streq_ptr(name, "name"))
+                                        state = STATE_METHOD_ARG_NAME;
+                                else if (streq_ptr(name, "type"))
+                                        state = STATE_METHOD_ARG_TYPE;
+                                else if (streq_ptr(name, "direction"))
+                                        state = STATE_METHOD_ARG_DIRECTION;
+                                else
+                                        return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
+                                                               "Unexpected method <arg> attribute %s.",
+                                                               name);
+                        } else if (t == XML_TAG_OPEN) {
+                                if (streq_ptr(name, "annotation")) {
+                                        r = parse_xml_annotation(context, NULL);
+                                        if (r < 0)
+                                                return r;
+                                } else
+                                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                               "Unexpected method <arg> tag %s.",
+                                                               name);
+                        } else if (t == XML_TAG_CLOSE_EMPTY ||
+                                   (t == XML_TAG_CLOSE && streq_ptr(name, "arg"))) {
+
+                                if (n_depth == 0) {
+
+                                        if (argument_type) {
+                                                if (!argument_direction || streq(argument_direction, "in")) {
+                                                        if (!strextend(&context->member_signature, argument_type))
+                                                                return log_oom();
+                                                } else if (streq(argument_direction, "out")) {
+                                                        if (!strextend(&context->member_result, argument_type))
+                                                                return log_oom();
+                                                } else
+                                                        log_error("Unexpected method <arg> direction value '%s'.", argument_direction);
+                                        }
+
+                                        argument_type = mfree(argument_type);
+                                        argument_direction = mfree(argument_direction);
+                                }
+
+                                state = STATE_METHOD;
+                        } else if (t != XML_TEXT || !in_charset(name, WHITESPACE))
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in method <arg>. (1)");
+
+                        break;
+
+                case STATE_METHOD_ARG_NAME:
+
+                        if (t == XML_ATTRIBUTE_VALUE)
+                                state = STATE_METHOD_ARG;
+                        else
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in method <arg>. (2)");
+
+                        break;
+
+                case STATE_METHOD_ARG_TYPE:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                free_and_replace(argument_type, name);
+
+                                state = STATE_METHOD_ARG;
+                        } else
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in method <arg>. (3)");
+
+                        break;
+
+                case STATE_METHOD_ARG_DIRECTION:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                free_and_replace(argument_direction, name);
+
+                                state = STATE_METHOD_ARG;
+                        } else
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in method <arg>. (4)");
+
+                        break;
+
+                case STATE_SIGNAL:
+
+                        if (t == XML_ATTRIBUTE_NAME) {
+                                if (streq_ptr(name, "name"))
+                                        state = STATE_SIGNAL_NAME;
+                                else
+                                        return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
+                                                               "Unexpected <signal> attribute %s.",
+                                                               name);
+                        } else if (t == XML_TAG_OPEN) {
+                                if (streq_ptr(name, "arg"))
+                                        state = STATE_SIGNAL_ARG;
+                                else if (streq_ptr(name, "annotation")) {
+                                        r = parse_xml_annotation(context, &context->member_flags);
+                                        if (r < 0)
+                                                return r;
+                                } else
+                                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                               "Unexpected <signal> tag %s.",
+                                                               name);
+                        } else if (t == XML_TAG_CLOSE_EMPTY ||
+                                   (t == XML_TAG_CLOSE && streq_ptr(name, "signal"))) {
+
+                                if (n_depth == 0) {
+                                        if (context->ops->on_signal) {
+                                                r = context->ops->on_signal(context->interface_name, context->member_name, context->member_signature, context->member_flags, context->userdata);
+                                                if (r < 0)
+                                                        return r;
+                                        }
+
+                                        context_reset_member(context);
+                                }
+
+                                state = STATE_INTERFACE;
+
+                        } else if (t != XML_TEXT || !in_charset(name, WHITESPACE))
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in <signal>. (1)");
+
+                        break;
+
+                case STATE_SIGNAL_NAME:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                if (n_depth == 0)
+                                        free_and_replace(context->member_name, name);
+
+                                state = STATE_SIGNAL;
+                        } else
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in <signal>. (2)");
+
+                        break;
+
+                case STATE_SIGNAL_ARG:
+
+                        if (t == XML_ATTRIBUTE_NAME) {
+                                if (streq_ptr(name, "name"))
+                                        state = STATE_SIGNAL_ARG_NAME;
+                                else if (streq_ptr(name, "type"))
+                                        state = STATE_SIGNAL_ARG_TYPE;
+                                else if (streq_ptr(name, "direction"))
+                                        state = STATE_SIGNAL_ARG_DIRECTION;
+                                else
+                                        return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
+                                                               "Unexpected signal <arg> attribute %s.",
+                                                               name);
+                        } else if (t == XML_TAG_OPEN) {
+                                if (streq_ptr(name, "annotation")) {
+                                        r = parse_xml_annotation(context, NULL);
+                                        if (r < 0)
+                                                return r;
+                                } else
+                                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                               "Unexpected signal <arg> tag %s.",
+                                                               name);
+                        } else if (t == XML_TAG_CLOSE_EMPTY ||
+                                   (t == XML_TAG_CLOSE && streq_ptr(name, "arg"))) {
+
+                                if (argument_type) {
+                                        if (!argument_direction || streq(argument_direction, "out")) {
+                                                if (!strextend(&context->member_signature, argument_type))
+                                                        return log_oom();
+                                        } else
+                                                log_error("Unexpected signal <arg> direction value '%s'.", argument_direction);
+
+                                        argument_type = mfree(argument_type);
+                                }
+
+                                state = STATE_SIGNAL;
+                        } else if (t != XML_TEXT || !in_charset(name, WHITESPACE))
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in signal <arg> (1).");
+
+                        break;
+
+                case STATE_SIGNAL_ARG_NAME:
+
+                        if (t == XML_ATTRIBUTE_VALUE)
+                                state = STATE_SIGNAL_ARG;
+                        else
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in signal <arg> (2).");
+
+                        break;
+
+                case STATE_SIGNAL_ARG_TYPE:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                free_and_replace(argument_type, name);
+
+                                state = STATE_SIGNAL_ARG;
+                        } else
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in signal <arg> (3).");
+
+                        break;
+
+                case STATE_SIGNAL_ARG_DIRECTION:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                free_and_replace(argument_direction, name);
+
+                                state = STATE_SIGNAL_ARG;
+                        } else
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in signal <arg>. (4)");
+
+                        break;
+
+                case STATE_PROPERTY:
+
+                        if (t == XML_ATTRIBUTE_NAME) {
+                                if (streq_ptr(name, "name"))
+                                        state = STATE_PROPERTY_NAME;
+                                else if (streq_ptr(name, "type"))
+                                        state  = STATE_PROPERTY_TYPE;
+                                else if (streq_ptr(name, "access"))
+                                        state  = STATE_PROPERTY_ACCESS;
+                                else
+                                        return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
+                                                               "Unexpected <property> attribute %s.",
+                                                               name);
+                        } else if (t == XML_TAG_OPEN) {
+
+                                if (streq_ptr(name, "annotation")) {
+                                        r = parse_xml_annotation(context, &context->member_flags);
+                                        if (r < 0)
+                                                return r;
+                                } else
+                                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                               "Unexpected <property> tag %s.",
+                                                               name);
+
+                        } else if (t == XML_TAG_CLOSE_EMPTY ||
+                                   (t == XML_TAG_CLOSE && streq_ptr(name, "property"))) {
+
+                                if (n_depth == 0) {
+                                        if (context->ops->on_property) {
+                                                r = context->ops->on_property(context->interface_name, context->member_name, context->member_signature, context->member_writable, context->member_flags, context->userdata);
+                                                if (r < 0)
+                                                        return r;
+                                        }
+
+                                        context_reset_member(context);
+                                }
+
+                                state = STATE_INTERFACE;
+
+                        } else if (t != XML_TEXT || !in_charset(name, WHITESPACE))
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in <property>. (1)");
+
+                        break;
+
+                case STATE_PROPERTY_NAME:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                if (n_depth == 0)
+                                        free_and_replace(context->member_name, name);
+
+                                state = STATE_PROPERTY;
+                        } else
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in <property>. (2)");
+
+                        break;
+
+                case STATE_PROPERTY_TYPE:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                if (n_depth == 0)
+                                        free_and_replace(context->member_signature, name);
+
+                                state = STATE_PROPERTY;
+                        } else
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in <property>. (3)");
+
+                        break;
+
+                case STATE_PROPERTY_ACCESS:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+
+                                if (streq(name, "readwrite") || streq(name, "write"))
+                                        context->member_writable = true;
+
+                                state = STATE_PROPERTY;
+                        } else
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Unexpected token in <property>. (4)");
+
+                        break;
+                }
+        }
+}
+
+int parse_xml_introspect(const char *prefix, const char *xml, const XMLIntrospectOps *ops, void *userdata) {
+        Context context = {
+                .ops = ops,
+                .userdata = userdata,
+                .current = xml,
+        };
+
+        int r;
+
+        assert(prefix);
+        assert(xml);
+        assert(ops);
+
+        for (;;) {
+                _cleanup_free_ char *name = NULL;
+
+                r = xml_tokenize(&context.current, &name, &context.xml_state, NULL);
+                if (r < 0) {
+                        log_error("XML parse error");
+                        goto finish;
+                }
+
+                if (r == XML_END) {
+                        r = 0;
+                        break;
+                }
+
+                if (r == XML_TAG_OPEN) {
+
+                        if (streq(name, "node")) {
+                                r = parse_xml_node(&context, prefix, 0);
+                                if (r < 0)
+                                        goto finish;
+                        } else {
+                                log_error("Unexpected tag '%s' in introspection data.", name);
+                                r = -EBADMSG;
+                                goto finish;
+                        }
+                } else if (r != XML_TEXT || !in_charset(name, WHITESPACE)) {
+                        log_error("Unexpected token.");
+                        r = -EBADMSG;
+                        goto finish;
+                }
+        }
+
+finish:
+        context_reset_interface(&context);
+
+        return r;
+}
diff --git a/src/busctl/busctl-introspect.h b/src/busctl/busctl-introspect.h
new file mode 100644
index 0000000..720a0df
--- /dev/null
+++ b/src/busctl/busctl-introspect.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+
+typedef struct XMLIntrospectOps {
+        int (*on_path)(const char *path, void *userdata);
+        int (*on_interface)(const char *name, uint64_t flags, void *userdata);
+        int (*on_method)(const char *interface, const char *name, const char *signature, const char *result, uint64_t flags, void *userdata);
+        int (*on_signal)(const char *interface, const char *name, const char *signature, uint64_t flags, void *userdata);
+        int (*on_property)(const char *interface, const char *name, const char *signature, bool writable, uint64_t flags, void *userdata);
+} XMLIntrospectOps;
+
+int parse_xml_introspect(const char *prefix, const char *xml, const XMLIntrospectOps *ops, void *userdata);
diff --git a/src/busctl/busctl.c b/src/busctl/busctl.c
new file mode 100644
index 0000000..ad69edf
--- /dev/null
+++ b/src/busctl/busctl.c
@@ -0,0 +1,2593 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <getopt.h>
+
+#include "sd-bus.h"
+
+#include "alloc-util.h"
+#include "bus-dump.h"
+#include "bus-internal.h"
+#include "bus-message.h"
+#include "bus-signature.h"
+#include "bus-type.h"
+#include "bus-util.h"
+#include "busctl-introspect.h"
+#include "escape.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "format-table.h"
+#include "glyph-util.h"
+#include "json.h"
+#include "log.h"
+#include "main-func.h"
+#include "os-util.h"
+#include "pager.h"
+#include "parse-argument.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "pretty-print.h"
+#include "set.h"
+#include "sort-util.h"
+#include "strv.h"
+#include "terminal-util.h"
+#include "user-util.h"
+#include "verbs.h"
+#include "version.h"
+
+static JsonFormatFlags arg_json_format_flags = JSON_FORMAT_OFF;
+static PagerFlags arg_pager_flags = 0;
+static bool arg_legend = true;
+static int arg_full = -1;
+static const char *arg_address = NULL;
+static bool arg_unique = false;
+static bool arg_acquired = false;
+static bool arg_activatable = false;
+static bool arg_show_machine = false;
+static char **arg_matches = NULL;
+static BusTransport arg_transport = BUS_TRANSPORT_LOCAL;
+static const char *arg_host = NULL;
+static bool arg_user = false;
+static size_t arg_snaplen = 4096;
+static bool arg_list = false;
+static bool arg_quiet = false;
+static bool arg_verbose = false;
+static bool arg_xml_interface = false;
+static bool arg_expect_reply = true;
+static bool arg_auto_start = true;
+static bool arg_allow_interactive_authorization = true;
+static bool arg_augment_creds = true;
+static bool arg_watch_bind = false;
+static usec_t arg_timeout = 0;
+static const char *arg_destination = NULL;
+
+STATIC_DESTRUCTOR_REGISTER(arg_matches, strv_freep);
+
+#define NAME_IS_ACQUIRED INT_TO_PTR(1)
+#define NAME_IS_ACTIVATABLE INT_TO_PTR(2)
+
+static int json_transform_message(sd_bus_message *m, JsonVariant **ret);
+
+static int acquire_bus(bool set_monitor, sd_bus **ret) {
+        _cleanup_(sd_bus_close_unrefp) sd_bus *bus = NULL;
+        int r;
+
+        r = sd_bus_new(&bus);
+        if (r < 0)
+                return log_error_errno(r, "Failed to allocate bus: %m");
+
+        (void) sd_bus_set_description(bus, "busctl");
+
+        if (set_monitor) {
+                r = sd_bus_set_monitor(bus, true);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to set monitor mode: %m");
+
+                r = sd_bus_negotiate_creds(bus, true, _SD_BUS_CREDS_ALL);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to enable credentials: %m");
+
+                r = sd_bus_negotiate_timestamp(bus, true);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to enable timestamps: %m");
+
+                r = sd_bus_negotiate_fds(bus, true);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to enable fds: %m");
+        }
+
+        r = sd_bus_set_bus_client(bus, true);
+        if (r < 0)
+                return log_error_errno(r, "Failed to set bus client: %m");
+
+        r = sd_bus_set_watch_bind(bus, arg_watch_bind);
+        if (r < 0)
+                return log_error_errno(r, "Failed to set watch-bind setting to '%s': %m",
+                                       yes_no(arg_watch_bind));
+
+        if (arg_address)
+                r = sd_bus_set_address(bus, arg_address);
+        else
+                switch (arg_transport) {
+
+                case BUS_TRANSPORT_LOCAL:
+                        if (arg_user)
+                                r = bus_set_address_user(bus);
+                        else
+                                r = bus_set_address_system(bus);
+                        break;
+
+                case BUS_TRANSPORT_REMOTE:
+                        r = bus_set_address_system_remote(bus, arg_host);
+                        break;
+
+                case BUS_TRANSPORT_MACHINE:
+                        r = bus_set_address_machine(bus, arg_user, arg_host);
+                        break;
+
+                default:
+                        assert_not_reached();
+                }
+
+        if (r < 0)
+                return bus_log_address_error(r, arg_transport);
+
+        r = sd_bus_start(bus);
+        if (r < 0)
+                return bus_log_connect_error(r, arg_transport);
+
+        *ret = TAKE_PTR(bus);
+
+        return 0;
+}
+
+static int list_bus_names(int argc, char **argv, void *userdata) {
+        _cleanup_strv_free_ char **acquired = NULL, **activatable = NULL;
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        _cleanup_hashmap_free_ Hashmap *names = NULL;
+        _cleanup_(table_unrefp) Table *table = NULL;
+        char *k;
+        void *v;
+        int r;
+
+        enum {
+                COLUMN_ACTIVATABLE,
+                COLUMN_NAME,
+                COLUMN_PID,
+                COLUMN_PROCESS,
+                COLUMN_USER,
+                COLUMN_CONNECTION,
+                COLUMN_UNIT,
+                COLUMN_SESSION,
+                COLUMN_DESCRIPTION,
+                COLUMN_MACHINE,
+        };
+
+        if (!arg_unique && !arg_acquired && !arg_activatable)
+                arg_unique = arg_acquired = arg_activatable = true;
+
+        r = acquire_bus(false, &bus);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_list_names(bus,
+                              (arg_acquired || arg_unique) ? &acquired : NULL,
+                              arg_activatable ? &activatable : NULL);
+        if (r < 0)
+                return log_error_errno(r, "Failed to list names: %m");
+
+        names = hashmap_new(&string_hash_ops);
+        if (!names)
+                return log_oom();
+
+        STRV_FOREACH(i, acquired) {
+                r = hashmap_put(names, *i, NAME_IS_ACQUIRED);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to add to hashmap: %m");
+        }
+
+        STRV_FOREACH(i, activatable) {
+                r = hashmap_put(names, *i, NAME_IS_ACTIVATABLE);
+                if (r < 0 && r != -EEXIST)
+                        return log_error_errno(r, "Failed to add to hashmap: %m");
+        }
+
+        table = table_new("activatable",
+                          "name",
+                          "pid",
+                          "process",
+                          "user",
+                          "connection",
+                          "unit",
+                          "session",
+                          "description",
+                          "machine");
+        if (!table)
+                return log_oom();
+
+        if (arg_full > 0)
+                table_set_width(table, 0);
+
+        r = table_set_align_percent(table, table_get_cell(table, 0, COLUMN_PID), 100);
+        if (r < 0)
+                return log_error_errno(r, "Failed to set alignment: %m");
+
+        table_set_ersatz_string(table, TABLE_ERSATZ_DASH);
+
+        r = table_set_sort(table, (size_t) COLUMN_NAME);
+        if (r < 0)
+                return log_error_errno(r, "Failed to set sort column: %m");
+
+        if (arg_show_machine)
+                r = table_set_display(table, (size_t) COLUMN_NAME,
+                                             (size_t) COLUMN_PID,
+                                             (size_t) COLUMN_PROCESS,
+                                             (size_t) COLUMN_USER,
+                                             (size_t) COLUMN_CONNECTION,
+                                             (size_t) COLUMN_UNIT,
+                                             (size_t) COLUMN_SESSION,
+                                             (size_t) COLUMN_DESCRIPTION,
+                                             (size_t) COLUMN_MACHINE);
+        else
+                r = table_set_display(table, (size_t) COLUMN_NAME,
+                                             (size_t) COLUMN_PID,
+                                             (size_t) COLUMN_PROCESS,
+                                             (size_t) COLUMN_USER,
+                                             (size_t) COLUMN_CONNECTION,
+                                             (size_t) COLUMN_UNIT,
+                                             (size_t) COLUMN_SESSION,
+                                             (size_t) COLUMN_DESCRIPTION);
+
+        if (r < 0)
+                return log_error_errno(r, "Failed to set columns to display: %m");
+
+        HASHMAP_FOREACH_KEY(v, k, names) {
+                _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
+
+                if (v == NAME_IS_ACTIVATABLE) {
+                        r = table_add_many(
+                                        table,
+                                        TABLE_INT, PTR_TO_INT(v),
+                                        TABLE_STRING, k,
+                                        TABLE_EMPTY,
+                                        TABLE_EMPTY,
+                                        TABLE_EMPTY,
+                                        TABLE_STRING, "(activatable)", TABLE_SET_COLOR, ansi_grey(),
+                                        TABLE_EMPTY,
+                                        TABLE_EMPTY,
+                                        TABLE_EMPTY,
+                                        TABLE_EMPTY);
+                        if (r < 0)
+                                return table_log_add_error(r);
+
+                        continue;
+                }
+
+                assert(v == NAME_IS_ACQUIRED);
+
+                if (!arg_unique && k[0] == ':')
+                        continue;
+
+                if (!arg_acquired && k[0] != ':')
+                        continue;
+
+                r = table_add_many(table,
+                                   TABLE_INT, PTR_TO_INT(v),
+                                   TABLE_STRING, k);
+                if (r < 0)
+                        return table_log_add_error(r);
+
+                r = sd_bus_get_name_creds(
+                                bus, k,
+                                (arg_augment_creds ? SD_BUS_CREDS_AUGMENT : 0) |
+                                SD_BUS_CREDS_EUID|SD_BUS_CREDS_PID|SD_BUS_CREDS_COMM|
+                                SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_SESSION|
+                                SD_BUS_CREDS_DESCRIPTION, &creds);
+                if (r < 0) {
+                        log_debug_errno(r, "Failed to acquire credentials of service %s, ignoring: %m", k);
+
+                        r = table_fill_empty(table, COLUMN_MACHINE);
+                } else {
+                        const char *unique = NULL, *session = NULL, *unit = NULL, *cn = NULL;
+                        pid_t pid;
+                        uid_t uid;
+
+                        r = sd_bus_creds_get_pid(creds, &pid);
+                        if (r >= 0) {
+                                const char *comm = NULL;
+
+                                (void) sd_bus_creds_get_comm(creds, &comm);
+
+                                r = table_add_many(table,
+                                                   TABLE_PID, pid,
+                                                   TABLE_STRING, strna(comm));
+                        } else
+                                r = table_add_many(table, TABLE_EMPTY, TABLE_EMPTY);
+                        if (r < 0)
+                                return table_log_add_error(r);
+
+                        r = sd_bus_creds_get_euid(creds, &uid);
+                        if (r >= 0) {
+                                _cleanup_free_ char *u = NULL;
+
+                                u = uid_to_name(uid);
+                                if (!u)
+                                        return log_oom();
+
+                                r = table_add_cell(table, NULL, TABLE_STRING, u);
+                        } else
+                                r = table_add_cell(table, NULL, TABLE_EMPTY, NULL);
+                        if (r < 0)
+                                return table_log_add_error(r);
+
+                        (void) sd_bus_creds_get_unique_name(creds, &unique);
+                        (void) sd_bus_creds_get_unit(creds, &unit);
+                        (void) sd_bus_creds_get_session(creds, &session);
+                        (void) sd_bus_creds_get_description(creds, &cn);
+
+                        r = table_add_many(
+                                        table,
+                                        TABLE_STRING, unique,
+                                        TABLE_STRING, unit,
+                                        TABLE_STRING, session,
+                                        TABLE_STRING, cn);
+                }
+                if (r < 0)
+                        return table_log_add_error(r);
+
+                if (arg_show_machine) {
+                        sd_id128_t mid;
+
+                        r = sd_bus_get_name_machine_id(bus, k, &mid);
+                        if (r < 0)
+                                log_debug_errno(r, "Failed to acquire credentials of service %s, ignoring: %m", k);
+                        else {
+                                r = table_add_cell(table, NULL, TABLE_ID128, &mid);
+                                if (r < 0)
+                                        return table_log_add_error(r);
+
+                                continue; /* line fully filled, no need to fill the remainder below */
+                        }
+                }
+
+                r = table_fill_empty(table, 0);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to fill line: %m");
+        }
+
+        return table_print_with_pager(table, arg_json_format_flags, arg_pager_flags, arg_legend);
+}
+
+static void print_subtree(const char *prefix, const char *path, char **l) {
+        /* We assume the list is sorted. Let's first skip over the
+         * entry we are looking at. */
+        for (;;) {
+                if (!*l)
+                        return;
+
+                if (!streq(*l, path))
+                        break;
+
+                l++;
+        }
+
+        const char
+                *vertical = strjoina(prefix, special_glyph(SPECIAL_GLYPH_TREE_VERTICAL)),
+                *space = strjoina(prefix, special_glyph(SPECIAL_GLYPH_TREE_SPACE));
+
+        for (;;) {
+                bool has_more = false;
+                char **n;
+
+                if (!*l || !path_startswith(*l, path))
+                        break;
+
+                n = l + 1;
+                for (;;) {
+                        if (!*n || !path_startswith(*n, path))
+                                break;
+
+                        if (!path_startswith(*n, *l)) {
+                                has_more = true;
+                                break;
+                        }
+
+                        n++;
+                }
+
+                printf("%s%s%s\n",
+                       prefix,
+                       special_glyph(has_more ? SPECIAL_GLYPH_TREE_BRANCH : SPECIAL_GLYPH_TREE_RIGHT),
+                       *l);
+
+                print_subtree(has_more ? vertical : space, *l, l);
+                l = n;
+        }
+}
+
+static void print_tree(char **l) {
+        if (arg_list)
+                strv_print(l);
+        else if (strv_isempty(l))
+                printf("No objects discovered.\n");
+        else if (streq(l[0], "/") && !l[1])
+                printf("Only root object discovered.\n");
+        else
+                print_subtree("", "/", l);
+}
+
+static int on_path(const char *path, void *userdata) {
+        Set *paths = ASSERT_PTR(userdata);
+        int r;
+
+        r = set_put_strdup(&paths, path);
+        if (r < 0)
+                return log_oom();
+
+        return 0;
+}
+
+static int find_nodes(sd_bus *bus, const char *service, const char *path, Set *paths) {
+        static const XMLIntrospectOps ops = {
+                .on_path = on_path,
+        };
+
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        const char *xml;
+        int r;
+
+        r = sd_bus_call_method(bus, service, path,
+                               "org.freedesktop.DBus.Introspectable", "Introspect",
+                               &error, &reply, NULL);
+        if (r < 0) {
+                printf("%sFailed to introspect object %s of service %s: %s%s\n",
+                       ansi_highlight_red(),
+                       path, service, bus_error_message(&error, r),
+                       ansi_normal());
+                return r;
+        }
+
+        r = sd_bus_message_read(reply, "s", &xml);
+        if (r < 0)
+                return bus_log_parse_error(r);
+
+        return parse_xml_introspect(path, xml, &ops, paths);
+}
+
+static int tree_one(sd_bus *bus, const char *service) {
+        _cleanup_set_free_ Set *paths = NULL, *done = NULL, *failed = NULL;
+        _cleanup_free_ char **l = NULL;
+        int r;
+
+        r = set_put_strdup(&paths, "/");
+        if (r < 0)
+                return log_oom();
+
+        for (;;) {
+                _cleanup_free_ char *p = NULL;
+                int q;
+
+                p = set_steal_first(paths);
+                if (!p)
+                        break;
+
+                if (set_contains(done, p) ||
+                    set_contains(failed, p))
+                        continue;
+
+                q = find_nodes(bus, service, p, paths);
+                if (q < 0 && r >= 0)
+                        r = q;
+
+                q = set_ensure_consume(q < 0 ? &failed : &done, &string_hash_ops_free, TAKE_PTR(p));
+                assert(q != 0);
+                if (q < 0)
+                        return log_oom();
+        }
+
+        pager_open(arg_pager_flags);
+
+        l = set_get_strv(done);
+        if (!l)
+                return log_oom();
+
+        strv_sort(l);
+        print_tree(l);
+
+        fflush(stdout);
+
+        return r;
+}
+
+static int tree(int argc, char **argv, void *userdata) {
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        int r;
+
+        /* Do superficial verification of arguments before even opening the bus */
+        STRV_FOREACH(i, strv_skip(argv, 1))
+                if (!sd_bus_service_name_is_valid(*i))
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                               "Invalid bus service name: %s", *i);
+
+        if (!arg_unique && !arg_acquired)
+                arg_acquired = true;
+
+        r = acquire_bus(false, &bus);
+        if (r < 0)
+                return r;
+
+        if (argc <= 1) {
+                _cleanup_strv_free_ char **names = NULL;
+                bool not_first = false;
+
+                r = sd_bus_list_names(bus, &names, NULL);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to get name list: %m");
+
+                pager_open(arg_pager_flags);
+
+                STRV_FOREACH(i, names) {
+                        int q;
+
+                        if (!arg_unique && (*i)[0] == ':')
+                                continue;
+
+                        if (!arg_acquired && (*i)[0] == ':')
+                                continue;
+
+                        if (not_first)
+                                printf("\n");
+
+                        printf("Service %s%s%s:\n", ansi_highlight(), *i, ansi_normal());
+
+                        q = tree_one(bus, *i);
+                        if (q < 0 && r >= 0)
+                                r = q;
+
+                        not_first = true;
+                }
+        } else
+                STRV_FOREACH(i, strv_skip(argv, 1)) {
+                        int q;
+
+                        if (i > argv+1)
+                                printf("\n");
+
+                        if (argv[2]) {
+                                pager_open(arg_pager_flags);
+                                printf("Service %s%s%s:\n", ansi_highlight(), *i, ansi_normal());
+                        }
+
+                        q = tree_one(bus, *i);
+                        if (q < 0 && r >= 0)
+                                r = q;
+                }
+
+        return r;
+}
+
+static int format_cmdline(sd_bus_message *m, FILE *f, bool needs_space) {
+        int r;
+
+        for (;;) {
+                const char *contents = NULL;
+                char type;
+                union {
+                        uint8_t u8;
+                        uint16_t u16;
+                        int16_t s16;
+                        uint32_t u32;
+                        int32_t s32;
+                        uint64_t u64;
+                        int64_t s64;
+                        double d64;
+                        const char *string;
+                        int i;
+                } basic;
+
+                r = sd_bus_message_peek_type(m, &type, &contents);
+                if (r < 0)
+                        return r;
+                if (r == 0)
+                        return needs_space;
+
+                if (bus_type_is_container(type) > 0) {
+
+                        r = sd_bus_message_enter_container(m, type, contents);
+                        if (r < 0)
+                                return r;
+
+                        if (type == SD_BUS_TYPE_ARRAY) {
+                                unsigned n = 0;
+
+                                /* count array entries */
+                                for (;;) {
+
+                                        r = sd_bus_message_skip(m, contents);
+                                        if (r < 0)
+                                                return r;
+                                        if (r == 0)
+                                                break;
+
+                                        n++;
+                                }
+
+                                r = sd_bus_message_rewind(m, false);
+                                if (r < 0)
+                                        return r;
+
+                                if (needs_space)
+                                        fputc(' ', f);
+
+                                fprintf(f, "%u", n);
+                                needs_space = true;
+
+                        } else if (type == SD_BUS_TYPE_VARIANT) {
+
+                                if (needs_space)
+                                        fputc(' ', f);
+
+                                fprintf(f, "%s", contents);
+                                needs_space = true;
+                        }
+
+                        r = format_cmdline(m, f, needs_space);
+                        if (r < 0)
+                                return r;
+
+                        needs_space = r > 0;
+
+                        r = sd_bus_message_exit_container(m);
+                        if (r < 0)
+                                return r;
+
+                        continue;
+                }
+
+                r = sd_bus_message_read_basic(m, type, &basic);
+                if (r < 0)
+                        return r;
+
+                if (needs_space)
+                        fputc(' ', f);
+
+                switch (type) {
+                case SD_BUS_TYPE_BYTE:
+                        fprintf(f, "%u", basic.u8);
+                        break;
+
+                case SD_BUS_TYPE_BOOLEAN:
+                        fputs(true_false(basic.i), f);
+                        break;
+
+                case SD_BUS_TYPE_INT16:
+                        fprintf(f, "%i", basic.s16);
+                        break;
+
+                case SD_BUS_TYPE_UINT16:
+                        fprintf(f, "%u", basic.u16);
+                        break;
+
+                case SD_BUS_TYPE_INT32:
+                        fprintf(f, "%i", basic.s32);
+                        break;
+
+                case SD_BUS_TYPE_UINT32:
+                        fprintf(f, "%u", basic.u32);
+                        break;
+
+                case SD_BUS_TYPE_INT64:
+                        fprintf(f, "%" PRIi64, basic.s64);
+                        break;
+
+                case SD_BUS_TYPE_UINT64:
+                        fprintf(f, "%" PRIu64, basic.u64);
+                        break;
+
+                case SD_BUS_TYPE_DOUBLE:
+                        fprintf(f, "%g", basic.d64);
+                        break;
+
+                case SD_BUS_TYPE_STRING:
+                case SD_BUS_TYPE_OBJECT_PATH:
+                case SD_BUS_TYPE_SIGNATURE: {
+                        _cleanup_free_ char *b = NULL;
+
+                        b = cescape(basic.string);
+                        if (!b)
+                                return -ENOMEM;
+
+                        fprintf(f, "\"%s\"", b);
+                        break;
+                }
+
+                case SD_BUS_TYPE_UNIX_FD:
+                        fprintf(f, "%i", basic.i);
+                        break;
+
+                default:
+                        assert_not_reached();
+                }
+
+                needs_space = true;
+        }
+}
+
+typedef struct Member {
+        const char *type;
+        char *interface;
+        char *name;
+        char *signature;
+        char *result;
+        char *value;
+        bool writable;
+        uint64_t flags;
+} Member;
+
+static void member_hash_func(const Member *m, struct siphash *state) {
+        uint64_t arity = 1;
+
+        assert(m);
+        assert(m->type);
+
+        string_hash_func(m->type, state);
+
+        arity += !!m->name + !!m->interface;
+
+        uint64_hash_func(&arity, state);
+
+        if (m->name)
+                string_hash_func(m->name, state);
+
+        if (m->signature)
+                string_hash_func(m->signature, state);
+
+        if (m->interface)
+                string_hash_func(m->interface, state);
+}
+
+static int member_compare_func(const Member *x, const Member *y) {
+        int d;
+
+        assert(x);
+        assert(y);
+        assert(x->type);
+        assert(y->type);
+
+        d = strcmp_ptr(x->interface, y->interface);
+        if (d != 0)
+                return d;
+
+        d = strcmp(x->type, y->type);
+        if (d != 0)
+                return d;
+
+        d = strcmp_ptr(x->name, y->name);
+        if (d != 0)
+                return d;
+
+        return strcmp_ptr(x->signature, y->signature);
+}
+
+static int member_compare_funcp(Member * const *a, Member * const *b) {
+        return member_compare_func(*a, *b);
+}
+
+static Member* member_free(Member *m) {
+        if (!m)
+                return NULL;
+
+        free(m->interface);
+        free(m->name);
+        free(m->signature);
+        free(m->result);
+        free(m->value);
+        return mfree(m);
+}
+DEFINE_TRIVIAL_CLEANUP_FUNC(Member*, member_free);
+
+static Set* member_set_free(Set *s) {
+        return set_free_with_destructor(s, member_free);
+}
+DEFINE_TRIVIAL_CLEANUP_FUNC(Set*, member_set_free);
+
+static int on_interface(const char *interface, uint64_t flags, void *userdata) {
+        _cleanup_(member_freep) Member *m = NULL;
+        Set *members = ASSERT_PTR(userdata);
+        int r;
+
+        assert(interface);
+
+        m = new(Member, 1);
+        if (!m)
+                return log_oom();
+
+        *m = (Member) {
+                .type = "interface",
+                .flags = flags,
+        };
+
+        r = free_and_strdup(&m->interface, interface);
+        if (r < 0)
+                return log_oom();
+
+        r = set_put(members, m);
+        if (r == 0)
+                return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
+                                       "Invalid introspection data: duplicate interface '%s'.", interface);
+        if (r < 0)
+                return log_oom();
+
+        m = NULL;
+        return 0;
+}
+
+static int on_method(const char *interface, const char *name, const char *signature, const char *result, uint64_t flags, void *userdata) {
+        _cleanup_(member_freep) Member *m = NULL;
+        Set *members = userdata;
+        int r;
+
+        assert(interface);
+        assert(name);
+
+        m = new(Member, 1);
+        if (!m)
+                return log_oom();
+
+        *m = (Member) {
+                .type = "method",
+                .flags = flags,
+        };
+
+        r = free_and_strdup(&m->interface, interface);
+        if (r < 0)
+                return log_oom();
+
+        r = free_and_strdup(&m->name, name);
+        if (r < 0)
+                return log_oom();
+
+        r = free_and_strdup(&m->signature, signature);
+        if (r < 0)
+                return log_oom();
+
+        r = free_and_strdup(&m->result, result);
+        if (r < 0)
+                return log_oom();
+
+        r = set_put(members, m);
+        if (r == 0)
+                return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
+                                       "Invalid introspection data: duplicate method '%s' on interface '%s'.", name, interface);
+        if (r < 0)
+                return log_oom();
+
+        m = NULL;
+        return 0;
+}
+
+static int on_signal(const char *interface, const char *name, const char *signature, uint64_t flags, void *userdata) {
+        _cleanup_(member_freep) Member *m = NULL;
+        Set *members = userdata;
+        int r;
+
+        assert(interface);
+        assert(name);
+
+        m = new(Member, 1);
+        if (!m)
+                return log_oom();
+
+        *m = (Member) {
+                .type = "signal",
+                .flags = flags,
+        };
+
+        r = free_and_strdup(&m->interface, interface);
+        if (r < 0)
+                return log_oom();
+
+        r = free_and_strdup(&m->name, name);
+        if (r < 0)
+                return log_oom();
+
+        r = free_and_strdup(&m->signature, signature);
+        if (r < 0)
+                return log_oom();
+
+        r = set_put(members, m);
+        if (r == 0)
+                return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
+                                       "Invalid introspection data: duplicate signal '%s' on interface '%s'.", name, interface);
+        if (r < 0)
+                return log_oom();
+
+        m = NULL;
+        return 0;
+}
+
+static int on_property(const char *interface, const char *name, const char *signature, bool writable, uint64_t flags, void *userdata) {
+        _cleanup_(member_freep) Member *m = NULL;
+        Set *members = userdata;
+        int r;
+
+        assert(interface);
+        assert(name);
+
+        m = new(Member, 1);
+        if (!m)
+                return log_oom();
+
+        *m = (Member) {
+                .type = "property",
+                .flags = flags,
+                .writable = writable,
+        };
+
+        r = free_and_strdup(&m->interface, interface);
+        if (r < 0)
+                return log_oom();
+
+        r = free_and_strdup(&m->name, name);
+        if (r < 0)
+                return log_oom();
+
+        r = free_and_strdup(&m->signature, signature);
+        if (r < 0)
+                return log_oom();
+
+        r = set_put(members, m);
+        if (r == 0)
+                return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
+                                       "Invalid introspection data: duplicate property '%s' on interface '%s'.", name, interface);
+        if (r < 0)
+                return log_oom();
+
+        m = NULL;
+        return 0;
+}
+
+DEFINE_PRIVATE_HASH_OPS(member_hash_ops, Member, member_hash_func, member_compare_func);
+
+static int introspect(int argc, char **argv, void *userdata) {
+        static const XMLIntrospectOps ops = {
+                .on_interface = on_interface,
+                .on_method = on_method,
+                .on_signal = on_signal,
+                .on_property = on_property,
+        };
+
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply_xml = NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(member_set_freep) Set *members = NULL;
+        unsigned name_width, type_width, signature_width, result_width;
+        Member *m;
+        const char *xml;
+        int r;
+
+        r = acquire_bus(false, &bus);
+        if (r < 0)
+                return r;
+
+        members = set_new(&member_hash_ops);
+        if (!members)
+                return log_oom();
+
+        r = sd_bus_call_method(bus, argv[1], argv[2],
+                               "org.freedesktop.DBus.Introspectable", "Introspect",
+                               &error, &reply_xml, NULL);
+        if (r < 0)
+                return log_error_errno(r, "Failed to introspect object %s of service %s: %s",
+                                       argv[2], argv[1], bus_error_message(&error, r));
+
+        r = sd_bus_message_read(reply_xml, "s", &xml);
+        if (r < 0)
+                return bus_log_parse_error(r);
+
+        if (arg_xml_interface) {
+                /* Just dump the received XML and finish */
+                pager_open(arg_pager_flags);
+                puts(xml);
+                return 0;
+        }
+
+        /* First, get list of all properties */
+        r = parse_xml_introspect(argv[2], xml, &ops, members);
+        if (r < 0)
+                return r;
+
+        /* Second, find the current values for them */
+        SET_FOREACH(m, members) {
+                _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
+
+                if (!streq(m->type, "property"))
+                        continue;
+
+                if (m->value)
+                        continue;
+
+                if (argv[3] && !streq(argv[3], m->interface))
+                        continue;
+
+                r = sd_bus_call_method(bus, argv[1], argv[2],
+                                       "org.freedesktop.DBus.Properties", "GetAll",
+                                       &error, &reply, "s", m->interface);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to get all properties on interface %s: %s",
+                                               m->interface, bus_error_message(&error, r));
+
+                r = sd_bus_message_enter_container(reply, 'a', "{sv}");
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                for (;;) {
+                        Member *z;
+                        _cleanup_free_ char *buf = NULL, *signature = NULL;
+                        _cleanup_fclose_ FILE *mf = NULL;
+                        size_t sz = 0;
+                        const char *name, *contents;
+                        char type;
+
+                        r = sd_bus_message_enter_container(reply, 'e', "sv");
+                        if (r < 0)
+                                return bus_log_parse_error(r);
+
+                        if (r == 0)
+                                break;
+
+                        r = sd_bus_message_read(reply, "s", &name);
+                        if (r < 0)
+                                return bus_log_parse_error(r);
+
+                        r = sd_bus_message_enter_container(reply, 'v', NULL);
+                        if (r < 0)
+                                return bus_log_parse_error(r);
+
+                        r = sd_bus_message_peek_type(reply, &type, &contents);
+                        if (r <= 0)
+                                return bus_log_parse_error(r == 0 ? EINVAL : r);
+
+                        if (type == SD_BUS_TYPE_STRUCT_BEGIN)
+                                signature = strjoin(CHAR_TO_STR(SD_BUS_TYPE_STRUCT_BEGIN), contents, CHAR_TO_STR(SD_BUS_TYPE_STRUCT_END));
+                        else if (type == SD_BUS_TYPE_DICT_ENTRY_BEGIN)
+                                signature = strjoin(CHAR_TO_STR(SD_BUS_TYPE_DICT_ENTRY_BEGIN), contents, CHAR_TO_STR(SD_BUS_TYPE_DICT_ENTRY_END));
+                        else if (contents)
+                                signature = strjoin(CHAR_TO_STR(type), contents);
+                        else
+                                signature = strdup(CHAR_TO_STR(type));
+                        if (!signature)
+                                return log_oom();
+
+                        mf = open_memstream_unlocked(&buf, &sz);
+                        if (!mf)
+                                return log_oom();
+
+                        r = format_cmdline(reply, mf, false);
+                        if (r < 0)
+                                return bus_log_parse_error(r);
+
+                        mf = safe_fclose(mf);
+
+                        z = set_get(members, &((Member) {
+                                                .type = "property",
+                                                .interface = m->interface,
+                                                .signature = signature,
+                                                .name = (char*) name }));
+                        if (z)
+                                free_and_replace(z->value, buf);
+
+                        r = sd_bus_message_exit_container(reply);
+                        if (r < 0)
+                                return bus_log_parse_error(r);
+
+                        r = sd_bus_message_exit_container(reply);
+                        if (r < 0)
+                                return bus_log_parse_error(r);
+                }
+
+                r = sd_bus_message_exit_container(reply);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+        }
+
+        name_width = strlen("NAME");
+        type_width = strlen("TYPE");
+        signature_width = strlen("SIGNATURE");
+        result_width = strlen("RESULT/VALUE");
+
+        Member **sorted = newa(Member*, set_size(members));
+        size_t k = 0;
+
+        SET_FOREACH(m, members) {
+                if (argv[3] && !streq(argv[3], m->interface))
+                        continue;
+
+                if (m->interface)
+                        name_width = MAX(name_width, strlen(m->interface));
+                if (m->name)
+                        name_width = MAX(name_width, strlen(m->name) + 1);
+                if (m->type)
+                        type_width = MAX(type_width, strlen(m->type));
+                if (m->signature)
+                        signature_width = MAX(signature_width, strlen(m->signature));
+                if (m->result)
+                        result_width = MAX(result_width, strlen(m->result));
+                if (m->value)
+                        result_width = MAX(result_width, strlen(m->value));
+
+                sorted[k++] = m;
+        }
+
+        if (result_width > 40 && arg_full <= 0)
+                result_width = 40;
+
+        typesafe_qsort(sorted, k, member_compare_funcp);
+
+        pager_open(arg_pager_flags);
+
+        if (arg_legend)
+                printf("%-*s %-*s %-*s %-*s %s\n",
+                       (int) name_width, "NAME",
+                       (int) type_width, "TYPE",
+                       (int) signature_width, "SIGNATURE",
+                       (int) result_width, "RESULT/VALUE",
+                       "FLAGS");
+
+        for (size_t j = 0; j < k; j++) {
+                _cleanup_free_ char *ellipsized = NULL;
+                const char *rv;
+                bool is_interface;
+
+                m = sorted[j];
+
+                if (argv[3] && !streq(argv[3], m->interface))
+                        continue;
+
+                is_interface = streq(m->type, "interface");
+
+                if (argv[3] && is_interface)
+                        continue;
+
+                if (m->value) {
+                        ellipsized = ellipsize(m->value, result_width, 100);
+                        if (!ellipsized)
+                                return log_oom();
+
+                        rv = ellipsized;
+                } else
+                        rv = empty_to_dash(m->result);
+
+                printf("%s%s%-*s%s %-*s %-*s %-*s%s%s%s%s%s%s\n",
+                       is_interface ? ansi_highlight() : "",
+                       is_interface ? "" : ".",
+                       - !is_interface + (int) name_width,
+                       empty_to_dash(streq_ptr(m->type, "interface") ? m->interface : m->name),
+                       is_interface ? ansi_normal() : "",
+                       (int) type_width, empty_to_dash(m->type),
+                       (int) signature_width, empty_to_dash(m->signature),
+                       (int) result_width, rv,
+                       (m->flags & SD_BUS_VTABLE_DEPRECATED) ? " deprecated" : (m->flags || m->writable ? "" : " -"),
+                       (m->flags & SD_BUS_VTABLE_METHOD_NO_REPLY) ? " no-reply" : "",
+                       (m->flags & SD_BUS_VTABLE_PROPERTY_CONST) ? " const" : "",
+                       (m->flags & SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE) ? " emits-change" : "",
+                       (m->flags & SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION) ? " emits-invalidation" : "",
+                       m->writable ? " writable" : "");
+        }
+
+        return 0;
+}
+
+static int message_dump(sd_bus_message *m, FILE *f) {
+        return sd_bus_message_dump(m, f, SD_BUS_MESSAGE_DUMP_WITH_HEADER);
+}
+
+static int message_pcap(sd_bus_message *m, FILE *f) {
+        return bus_message_pcap_frame(m, arg_snaplen, f);
+}
+
+static int message_json(sd_bus_message *m, FILE *f) {
+        _cleanup_(json_variant_unrefp) JsonVariant *v = NULL, *w = NULL;
+        char e[2];
+        int r;
+        usec_t ts;
+
+        r = json_transform_message(m, &v);
+        if (r < 0)
+                return r;
+
+        e[0] = m->header->endian;
+        e[1] = 0;
+
+        ts = m->realtime;
+        if (ts == 0)
+                ts = now(CLOCK_REALTIME);
+
+        r = json_build(&w, JSON_BUILD_OBJECT(
+                JSON_BUILD_PAIR("type", JSON_BUILD_STRING(bus_message_type_to_string(m->header->type))),
+                JSON_BUILD_PAIR("endian", JSON_BUILD_STRING(e)),
+                JSON_BUILD_PAIR("flags", JSON_BUILD_INTEGER(m->header->flags)),
+                JSON_BUILD_PAIR("version", JSON_BUILD_INTEGER(m->header->version)),
+                JSON_BUILD_PAIR("cookie", JSON_BUILD_INTEGER(BUS_MESSAGE_COOKIE(m))),
+                JSON_BUILD_PAIR_CONDITION(m->reply_cookie != 0, "reply_cookie", JSON_BUILD_INTEGER(m->reply_cookie)),
+                JSON_BUILD_PAIR("timestamp-realtime", JSON_BUILD_UNSIGNED(ts)),
+                JSON_BUILD_PAIR_CONDITION(m->sender, "sender", JSON_BUILD_STRING(m->sender)),
+                JSON_BUILD_PAIR_CONDITION(m->destination, "destination", JSON_BUILD_STRING(m->destination)),
+                JSON_BUILD_PAIR_CONDITION(m->path, "path", JSON_BUILD_STRING(m->path)),
+                JSON_BUILD_PAIR_CONDITION(m->interface, "interface", JSON_BUILD_STRING(m->interface)),
+                JSON_BUILD_PAIR_CONDITION(m->member, "member", JSON_BUILD_STRING(m->member)),
+                JSON_BUILD_PAIR_CONDITION(m->monotonic != 0, "monotonic", JSON_BUILD_INTEGER(m->monotonic)),
+                JSON_BUILD_PAIR_CONDITION(m->realtime != 0, "realtime", JSON_BUILD_INTEGER(m->realtime)),
+                JSON_BUILD_PAIR_CONDITION(m->seqnum != 0, "seqnum", JSON_BUILD_INTEGER(m->seqnum)),
+                JSON_BUILD_PAIR_CONDITION(m->error.name, "error_name", JSON_BUILD_STRING(m->error.name)),
+                JSON_BUILD_PAIR("payload", JSON_BUILD_VARIANT(v))));
+        if (r < 0)
+                return log_error_errno(r, "Failed to build JSON object: %m");
+
+        json_variant_dump(w, arg_json_format_flags, f, NULL);
+        return 0;
+}
+
+static int monitor(int argc, char **argv, int (*dump)(sd_bus_message *m, FILE *f)) {
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *message = NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        uint32_t flags = 0;
+        const char *unique_name;
+        bool is_monitor = false;
+        int r;
+
+        r = acquire_bus(true, &bus);
+        if (r < 0)
+                return r;
+
+        /* upgrade connection; it's not used for anything else after this call */
+        r = sd_bus_message_new_method_call(bus,
+                                           &message,
+                                           "org.freedesktop.DBus",
+                                           "/org/freedesktop/DBus",
+                                           "org.freedesktop.DBus.Monitoring",
+                                           "BecomeMonitor");
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_message_open_container(message, 'a', "s");
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        STRV_FOREACH(i, argv+1) {
+                _cleanup_free_ char *m = NULL;
+
+                if (!sd_bus_service_name_is_valid(*i))
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid service name '%s'", *i);
+
+                m = strjoin("sender='", *i, "'");
+                if (!m)
+                        return log_oom();
+
+                r = sd_bus_message_append_basic(message, 's', m);
+                if (r < 0)
+                        return bus_log_create_error(r);
+
+                free(m);
+                m = strjoin("destination='", *i, "'");
+                if (!m)
+                        return log_oom();
+
+                r = sd_bus_message_append_basic(message, 's', m);
+                if (r < 0)
+                        return bus_log_create_error(r);
+        }
+
+        STRV_FOREACH(i, arg_matches) {
+                r = sd_bus_message_append_basic(message, 's', *i);
+                if (r < 0)
+                        return bus_log_create_error(r);
+        }
+
+        r = sd_bus_message_close_container(message);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_message_append_basic(message, 'u', &flags);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_call(bus, message, arg_timeout, &error, NULL);
+        if (r < 0)
+                return log_error_errno(r, "Call to org.freedesktop.DBus.Monitoring.BecomeMonitor failed: %s",
+                                       bus_error_message(&error, r));
+
+        r = sd_bus_get_unique_name(bus, &unique_name);
+        if (r < 0)
+                return log_error_errno(r, "Failed to get unique name: %m");
+
+        log_info("Monitoring bus message stream.");
+
+        for (;;) {
+                _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
+
+                r = sd_bus_process(bus, &m);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to process bus: %m");
+
+                if (m) {
+                        if (!is_monitor) {
+                                const char *name;
+
+                                /* wait until we lose our unique name */
+                                if (sd_bus_message_is_signal(m, "org.freedesktop.DBus", "NameLost") <= 0)
+                                        continue;
+
+                                r = sd_bus_message_read(m, "s", &name);
+                                if (r < 0)
+                                        return bus_log_parse_error(r);
+
+                                if (streq(name, unique_name))
+                                        is_monitor = true;
+
+                                continue;
+                        }
+
+                        dump(m, stdout);
+                        fflush(stdout);
+
+                        if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected") > 0) {
+                                log_info("Connection terminated, exiting.");
+                                return 0;
+                        }
+
+                        continue;
+                }
+
+                if (r > 0)
+                        continue;
+
+                r = sd_bus_wait(bus, UINT64_MAX);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to wait for bus: %m");
+        }
+}
+
+static int verb_monitor(int argc, char **argv, void *userdata) {
+        return monitor(argc, argv, (arg_json_format_flags & JSON_FORMAT_OFF) ? message_dump : message_json);
+}
+
+static int verb_capture(int argc, char **argv, void *userdata) {
+        _cleanup_free_ char *osname = NULL;
+        static const char info[] =
+                "busctl (systemd) " STRINGIFY(PROJECT_VERSION) " (Git " GIT_VERSION ")";
+        int r;
+
+        if (isatty(fileno(stdout)) > 0)
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "Refusing to write message data to console, please redirect output to a file.");
+
+        r = parse_os_release(NULL, "PRETTY_NAME", &osname);
+        if (r < 0)
+                log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_INFO, r,
+                               "Failed to read os-release file, ignoring: %m");
+        bus_pcap_header(arg_snaplen, osname, info, stdout);
+
+        r = monitor(argc, argv, message_pcap);
+        if (r < 0)
+                return r;
+
+        r = fflush_and_check(stdout);
+        if (r < 0)
+                return log_error_errno(r, "Couldn't write capture file: %m");
+
+        return r;
+}
+
+static int status(int argc, char **argv, void *userdata) {
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
+        pid_t pid;
+        int r;
+
+        r = acquire_bus(false, &bus);
+        if (r < 0)
+                return r;
+
+        pager_open(arg_pager_flags);
+
+        if (!isempty(argv[1])) {
+                r = parse_pid(argv[1], &pid);
+                if (r < 0)
+                        r = sd_bus_get_name_creds(
+                                        bus,
+                                        argv[1],
+                                        (arg_augment_creds ? SD_BUS_CREDS_AUGMENT : 0) | _SD_BUS_CREDS_ALL,
+                                        &creds);
+                else
+                        r = sd_bus_creds_new_from_pid(
+                                        &creds,
+                                        pid,
+                                        _SD_BUS_CREDS_ALL);
+        } else {
+                const char *scope, *address;
+                sd_id128_t bus_id;
+
+                r = sd_bus_get_address(bus, &address);
+                if (r >= 0)
+                        printf("BusAddress=%s%s%s\n", ansi_highlight(), address, ansi_normal());
+
+                r = sd_bus_get_scope(bus, &scope);
+                if (r >= 0)
+                        printf("BusScope=%s%s%s\n", ansi_highlight(), scope, ansi_normal());
+
+                r = sd_bus_get_bus_id(bus, &bus_id);
+                if (r >= 0)
+                        printf("BusID=%s" SD_ID128_FORMAT_STR "%s\n",
+                               ansi_highlight(), SD_ID128_FORMAT_VAL(bus_id), ansi_normal());
+
+                r = sd_bus_get_owner_creds(
+                                bus,
+                                (arg_augment_creds ? SD_BUS_CREDS_AUGMENT : 0) | _SD_BUS_CREDS_ALL,
+                                &creds);
+        }
+
+        if (r < 0)
+                return log_error_errno(r, "Failed to get credentials: %m");
+
+        bus_creds_dump(creds, NULL, false);
+        return 0;
+}
+
+static int message_append_cmdline(sd_bus_message *m, const char *signature, char ***x) {
+        char **p;
+        int r;
+
+        assert(m);
+        assert(signature);
+        assert(x);
+
+        p = *x;
+
+        for (;;) {
+                const char *v;
+                char t;
+
+                t = *signature;
+                v = *p;
+
+                if (t == 0)
+                        break;
+                if (!v)
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                               "Too few parameters for signature.");
+
+                signature++;
+                p++;
+
+                switch (t) {
+
+                case SD_BUS_TYPE_BOOLEAN:
+
+                        r = parse_boolean(v);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse '%s' as boolean: %m", v);
+
+                        r = sd_bus_message_append_basic(m, t, &r);
+                        break;
+
+                case SD_BUS_TYPE_BYTE: {
+                        uint8_t z;
+
+                        r = safe_atou8(v, &z);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse '%s' as byte (unsigned 8bit integer): %m", v);
+
+                        r = sd_bus_message_append_basic(m, t, &z);
+                        break;
+                }
+
+                case SD_BUS_TYPE_INT16: {
+                        int16_t z;
+
+                        r = safe_atoi16(v, &z);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse '%s' as signed 16bit integer: %m", v);
+
+                        r = sd_bus_message_append_basic(m, t, &z);
+                        break;
+                }
+
+                case SD_BUS_TYPE_UINT16: {
+                        uint16_t z;
+
+                        r = safe_atou16(v, &z);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse '%s' as unsigned 16bit integer: %m", v);
+
+                        r = sd_bus_message_append_basic(m, t, &z);
+                        break;
+                }
+
+                case SD_BUS_TYPE_INT32: {
+                        int32_t z;
+
+                        r = safe_atoi32(v, &z);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse '%s' as signed 32bit integer: %m", v);
+
+                        r = sd_bus_message_append_basic(m, t, &z);
+                        break;
+                }
+
+                case SD_BUS_TYPE_UINT32: {
+                        uint32_t z;
+
+                        r = safe_atou32(v, &z);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse '%s' as unsigned 32bit integer: %m", v);
+
+                        r = sd_bus_message_append_basic(m, t, &z);
+                        break;
+                }
+
+                case SD_BUS_TYPE_INT64: {
+                        int64_t z;
+
+                        r = safe_atoi64(v, &z);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse '%s' as signed 64bit integer: %m", v);
+
+                        r = sd_bus_message_append_basic(m, t, &z);
+                        break;
+                }
+
+                case SD_BUS_TYPE_UINT64: {
+                        uint64_t z;
+
+                        r = safe_atou64(v, &z);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse '%s' as unsigned 64bit integer: %m", v);
+
+                        r = sd_bus_message_append_basic(m, t, &z);
+                        break;
+                }
+
+                case SD_BUS_TYPE_DOUBLE: {
+                        double z;
+
+                        r = safe_atod(v, &z);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse '%s' as double precision floating point: %m", v);
+
+                        r = sd_bus_message_append_basic(m, t, &z);
+                        break;
+                }
+
+                case SD_BUS_TYPE_STRING:
+                case SD_BUS_TYPE_OBJECT_PATH:
+                case SD_BUS_TYPE_SIGNATURE:
+
+                        r = sd_bus_message_append_basic(m, t, v);
+                        break;
+
+                case SD_BUS_TYPE_ARRAY: {
+                        uint32_t n;
+                        size_t k;
+
+                        r = safe_atou32(v, &n);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse '%s' number of array entries: %m", v);
+
+                        r = signature_element_length(signature, &k);
+                        if (r < 0)
+                                return log_error_errno(r, "Invalid array signature: %m");
+
+                        {
+                                char s[k + 1];
+                                memcpy(s, signature, k);
+                                s[k] = 0;
+
+                                r = sd_bus_message_open_container(m, SD_BUS_TYPE_ARRAY, s);
+                                if (r < 0)
+                                        return bus_log_create_error(r);
+
+                                for (unsigned i = 0; i < n; i++) {
+                                        r = message_append_cmdline(m, s, &p);
+                                        if (r < 0)
+                                                return r;
+                                }
+                        }
+
+                        signature += k;
+
+                        r = sd_bus_message_close_container(m);
+                        break;
+                }
+
+                case SD_BUS_TYPE_VARIANT:
+                        r = sd_bus_message_open_container(m, SD_BUS_TYPE_VARIANT, v);
+                        if (r < 0)
+                                return bus_log_create_error(r);
+
+                        r = message_append_cmdline(m, v, &p);
+                        if (r < 0)
+                                return r;
+
+                        r = sd_bus_message_close_container(m);
+                        break;
+
+                case SD_BUS_TYPE_STRUCT_BEGIN:
+                case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
+                        size_t k;
+
+                        signature--;
+                        p--;
+
+                        r = signature_element_length(signature, &k);
+                        if (r < 0 || k < 2) {
+                                if (r >= 0 && k < 2)
+                                        r = -ERANGE;
+                                return log_error_errno(r, "Invalid struct/dict entry signature: %m");
+                        }
+
+                        {
+                                char s[k-1];
+                                memcpy(s, signature + 1, k - 2);
+                                s[k - 2] = 0;
+
+                                const char ctype = t == SD_BUS_TYPE_STRUCT_BEGIN ?
+                                        SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY;
+                                r = sd_bus_message_open_container(m, ctype, s);
+                                if (r < 0)
+                                        return bus_log_create_error(r);
+
+                                r = message_append_cmdline(m, s, &p);
+                                if (r < 0)
+                                        return r;
+                        }
+
+                        signature += k;
+
+                        r = sd_bus_message_close_container(m);
+                        break;
+                }
+
+                case SD_BUS_TYPE_UNIX_FD:
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                               "UNIX file descriptor not supported as type.");
+
+                default:
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                               "Unknown signature type %c.", t);
+                }
+
+                if (r < 0)
+                        return bus_log_create_error(r);
+        }
+
+        *x = p;
+        return 0;
+}
+
+static int json_transform_one(sd_bus_message *m, JsonVariant **ret);
+
+static int json_transform_array_or_struct(sd_bus_message *m, JsonVariant **ret) {
+        JsonVariant **elements = NULL;
+        size_t n_elements = 0;
+        int r;
+
+        assert(m);
+        assert(ret);
+
+        for (;;) {
+                r = sd_bus_message_at_end(m, false);
+                if (r < 0) {
+                        bus_log_parse_error(r);
+                        goto finish;
+                }
+                if (r > 0)
+                        break;
+
+                if (!GREEDY_REALLOC(elements, n_elements + 1)) {
+                        r = log_oom();
+                        goto finish;
+                }
+
+                r = json_transform_one(m, elements + n_elements);
+                if (r < 0)
+                        goto finish;
+
+                n_elements++;
+        }
+
+        r = json_variant_new_array(ret, elements, n_elements);
+
+finish:
+        json_variant_unref_many(elements, n_elements);
+        free(elements);
+
+        return r;
+}
+
+static int json_transform_variant(sd_bus_message *m, const char *contents, JsonVariant **ret) {
+        _cleanup_(json_variant_unrefp) JsonVariant *value = NULL;
+        int r;
+
+        assert(m);
+        assert(contents);
+        assert(ret);
+
+        r = json_transform_one(m, &value);
+        if (r < 0)
+                return r;
+
+        r = json_build(ret, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("type", JSON_BUILD_STRING(contents)),
+                                              JSON_BUILD_PAIR("data", JSON_BUILD_VARIANT(value))));
+        if (r < 0)
+                return log_oom();
+
+        return r;
+}
+
+static int json_transform_dict_array(sd_bus_message *m, JsonVariant **ret) {
+        JsonVariant **elements = NULL;
+        size_t n_elements = 0;
+        int r;
+
+        assert(m);
+        assert(ret);
+
+        for (;;) {
+                const char *contents;
+                char type;
+
+                r = sd_bus_message_at_end(m, false);
+                if (r < 0) {
+                        bus_log_parse_error(r);
+                        goto finish;
+                }
+                if (r > 0)
+                        break;
+
+                r = sd_bus_message_peek_type(m, &type, &contents);
+                if (r < 0)
+                        return r;
+
+                assert(type == 'e');
+
+                if (!GREEDY_REALLOC(elements, n_elements + 2)) {
+                        r = log_oom();
+                        goto finish;
+                }
+
+                r = sd_bus_message_enter_container(m, type, contents);
+                if (r < 0) {
+                        bus_log_parse_error(r);
+                        goto finish;
+                }
+
+                r = json_transform_one(m, elements + n_elements);
+                if (r < 0)
+                        goto finish;
+
+                n_elements++;
+
+                r = json_transform_one(m, elements + n_elements);
+                if (r < 0)
+                        goto finish;
+
+                n_elements++;
+
+                r = sd_bus_message_exit_container(m);
+                if (r < 0) {
+                        bus_log_parse_error(r);
+                        goto finish;
+                }
+        }
+
+        r = json_variant_new_object(ret, elements, n_elements);
+
+finish:
+        json_variant_unref_many(elements, n_elements);
+        free(elements);
+
+        return r;
+}
+
+static int json_transform_one(sd_bus_message *m, JsonVariant **ret) {
+        _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
+        const char *contents;
+        char type;
+        int r;
+
+        assert(m);
+        assert(ret);
+
+        r = sd_bus_message_peek_type(m, &type, &contents);
+        if (r < 0)
+                return bus_log_parse_error(r);
+
+        switch (type) {
+
+        case SD_BUS_TYPE_BYTE: {
+                uint8_t b;
+
+                r = sd_bus_message_read_basic(m, type, &b);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = json_variant_new_unsigned(&v, b);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to transform byte: %m");
+
+                break;
+        }
+
+        case SD_BUS_TYPE_BOOLEAN: {
+                int b;
+
+                r = sd_bus_message_read_basic(m, type, &b);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = json_variant_new_boolean(&v, b);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to transform boolean: %m");
+
+                break;
+        }
+
+        case SD_BUS_TYPE_INT16: {
+                int16_t b;
+
+                r = sd_bus_message_read_basic(m, type, &b);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = json_variant_new_integer(&v, b);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to transform int16: %m");
+
+                break;
+        }
+
+        case SD_BUS_TYPE_UINT16: {
+                uint16_t b;
+
+                r = sd_bus_message_read_basic(m, type, &b);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = json_variant_new_unsigned(&v, b);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to transform uint16: %m");
+
+                break;
+        }
+
+        case SD_BUS_TYPE_INT32: {
+                int32_t b;
+
+                r = sd_bus_message_read_basic(m, type, &b);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = json_variant_new_integer(&v, b);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to transform int32: %m");
+
+                break;
+        }
+
+        case SD_BUS_TYPE_UINT32: {
+                uint32_t b;
+
+                r = sd_bus_message_read_basic(m, type, &b);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = json_variant_new_unsigned(&v, b);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to transform uint32: %m");
+
+                break;
+        }
+
+        case SD_BUS_TYPE_INT64: {
+                int64_t b;
+
+                r = sd_bus_message_read_basic(m, type, &b);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = json_variant_new_integer(&v, b);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to transform int64: %m");
+
+                break;
+        }
+
+        case SD_BUS_TYPE_UINT64: {
+                uint64_t b;
+
+                r = sd_bus_message_read_basic(m, type, &b);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = json_variant_new_unsigned(&v, b);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to transform uint64: %m");
+
+                break;
+        }
+
+        case SD_BUS_TYPE_DOUBLE: {
+                double d;
+
+                r = sd_bus_message_read_basic(m, type, &d);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = json_variant_new_real(&v, d);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to transform double: %m");
+
+                break;
+        }
+
+        case SD_BUS_TYPE_STRING:
+        case SD_BUS_TYPE_OBJECT_PATH:
+        case SD_BUS_TYPE_SIGNATURE: {
+                const char *s;
+
+                r = sd_bus_message_read_basic(m, type, &s);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = json_variant_new_string(&v, s);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to transform double: %m");
+
+                break;
+        }
+
+        case SD_BUS_TYPE_UNIX_FD:
+                r = sd_bus_message_read_basic(m, type, NULL);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = json_variant_new_null(&v);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to transform fd: %m");
+
+                break;
+
+        case SD_BUS_TYPE_ARRAY:
+        case SD_BUS_TYPE_VARIANT:
+        case SD_BUS_TYPE_STRUCT:
+                r = sd_bus_message_enter_container(m, type, contents);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                if (type == SD_BUS_TYPE_VARIANT)
+                        r = json_transform_variant(m, contents, &v);
+                else if (type == SD_BUS_TYPE_ARRAY && contents[0] == '{')
+                        r = json_transform_dict_array(m, &v);
+                else
+                        r = json_transform_array_or_struct(m, &v);
+                if (r < 0)
+                        return r;
+
+                r = sd_bus_message_exit_container(m);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                break;
+
+        default:
+                assert_not_reached();
+        }
+
+        *ret = TAKE_PTR(v);
+        return 0;
+}
+
+static int json_transform_message(sd_bus_message *m, JsonVariant **ret) {
+        _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
+        const char *type;
+        int r;
+
+        assert(m);
+        assert(ret);
+
+        assert_se(type = sd_bus_message_get_signature(m, false));
+
+        r = json_transform_array_or_struct(m, &v);
+        if (r < 0)
+                return r;
+
+        r = json_build(ret, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("type",  JSON_BUILD_STRING(type)),
+                                              JSON_BUILD_PAIR("data", JSON_BUILD_VARIANT(v))));
+        if (r < 0)
+                return log_oom();
+
+        return 0;
+}
+
+static int call(int argc, char **argv, void *userdata) {
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL;
+        int r;
+
+        r = acquire_bus(false, &bus);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_new_method_call(bus, &m, argv[1], argv[2], argv[3], argv[4]);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_message_set_expect_reply(m, arg_expect_reply);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_message_set_auto_start(m, arg_auto_start);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_message_set_allow_interactive_authorization(m, arg_allow_interactive_authorization);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        if (!isempty(argv[5])) {
+                char **p;
+
+                p = argv+6;
+
+                r = message_append_cmdline(m, argv[5], &p);
+                if (r < 0)
+                        return r;
+
+                if (*p)
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                               "Too many parameters for signature.");
+        }
+
+        if (!arg_expect_reply) {
+                r = sd_bus_send(bus, m, NULL);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to send message: %m");
+
+                return 0;
+        }
+
+        r = sd_bus_call(bus, m, arg_timeout, &error, &reply);
+        if (r < 0)
+                return log_error_errno(r, "Call failed: %s", bus_error_message(&error, r));
+
+        r = sd_bus_message_is_empty(reply);
+        if (r < 0)
+                return bus_log_parse_error(r);
+
+        if (r == 0 && !arg_quiet) {
+
+                if (!FLAGS_SET(arg_json_format_flags, JSON_FORMAT_OFF)) {
+                        _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
+
+                        if (arg_json_format_flags & (JSON_FORMAT_PRETTY|JSON_FORMAT_PRETTY_AUTO))
+                                pager_open(arg_pager_flags);
+
+                        r = json_transform_message(reply, &v);
+                        if (r < 0)
+                                return r;
+
+                        json_variant_dump(v, arg_json_format_flags, NULL, NULL);
+
+                } else if (arg_verbose) {
+                        pager_open(arg_pager_flags);
+
+                        r = sd_bus_message_dump(reply, stdout, 0);
+                        if (r < 0)
+                                return r;
+                } else {
+
+                        fputs(sd_bus_message_get_signature(reply, true), stdout);
+                        fputc(' ', stdout);
+
+                        r = format_cmdline(reply, stdout, false);
+                        if (r < 0)
+                                return bus_log_parse_error(r);
+
+                        fputc('\n', stdout);
+                }
+        }
+
+        return 0;
+}
+
+static int emit_signal(int argc, char **argv, void *userdata) {
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
+        int r;
+
+        r = acquire_bus(false, &bus);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_new_signal(bus, &m, argv[1], argv[2], argv[3]);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        if (arg_destination) {
+                r = sd_bus_message_set_destination(m, arg_destination);
+                if (r < 0)
+                        return bus_log_create_error(r);
+        }
+
+        r = sd_bus_message_set_auto_start(m, arg_auto_start);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        if (!isempty(argv[4])) {
+                char **p;
+
+                p = argv+5;
+
+                r = message_append_cmdline(m, argv[4], &p);
+                if (r < 0)
+                        return r;
+
+                if (*p)
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                               "Too many parameters for signature.");
+        }
+
+        r = sd_bus_send(bus, m, NULL);
+        if (r < 0)
+                return log_error_errno(r, "Failed to send signal: %m");
+
+        return 0;
+}
+
+static int get_property(int argc, char **argv, void *userdata) {
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        int r;
+
+        r = acquire_bus(false, &bus);
+        if (r < 0)
+                return r;
+
+        STRV_FOREACH(i, argv + 4) {
+                _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
+                const char *contents = NULL;
+                char type;
+
+                r = sd_bus_call_method(bus, argv[1], argv[2],
+                                       "org.freedesktop.DBus.Properties", "Get",
+                                       &error, &reply, "ss", argv[3], *i);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to get property %s on interface %s: %s",
+                                               *i, argv[3],
+                                               bus_error_message(&error, r));
+
+                r = sd_bus_message_peek_type(reply, &type, &contents);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = sd_bus_message_enter_container(reply, 'v', contents);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                if (!FLAGS_SET(arg_json_format_flags, JSON_FORMAT_OFF)) {
+                        _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
+
+                        if (arg_json_format_flags & (JSON_FORMAT_PRETTY|JSON_FORMAT_PRETTY_AUTO))
+                                pager_open(arg_pager_flags);
+
+                        r = json_transform_variant(reply, contents, &v);
+                        if (r < 0)
+                                return r;
+
+                        json_variant_dump(v, arg_json_format_flags, NULL, NULL);
+
+                } else if (arg_verbose) {
+                        pager_open(arg_pager_flags);
+
+                        r = sd_bus_message_dump(reply, stdout, SD_BUS_MESSAGE_DUMP_SUBTREE_ONLY);
+                        if (r < 0)
+                                return r;
+                } else {
+                        fputs(contents, stdout);
+                        fputc(' ', stdout);
+
+                        r = format_cmdline(reply, stdout, false);
+                        if (r < 0)
+                                return bus_log_parse_error(r);
+
+                        fputc('\n', stdout);
+                }
+
+                r = sd_bus_message_exit_container(reply);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+        }
+
+        return 0;
+}
+
+static int set_property(int argc, char **argv, void *userdata) {
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        char **p;
+        int r;
+
+        r = acquire_bus(false, &bus);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_new_method_call(bus, &m, argv[1], argv[2],
+                                           "org.freedesktop.DBus.Properties", "Set");
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_message_append(m, "ss", argv[3], argv[4]);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_message_open_container(m, 'v', argv[5]);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        p = argv + 6;
+        r = message_append_cmdline(m, argv[5], &p);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_close_container(m);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        if (*p)
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Too many parameters for signature.");
+
+        r = sd_bus_call(bus, m, arg_timeout, &error, NULL);
+        if (r < 0)
+                return log_error_errno(r, "Failed to set property %s on interface %s: %s",
+                                       argv[4], argv[3],
+                                       bus_error_message(&error, r));
+
+        return 0;
+}
+
+static int help(void) {
+        _cleanup_free_ char *link = NULL;
+        int r;
+
+        r = terminal_urlify_man("busctl", "1", &link);
+        if (r < 0)
+                return log_oom();
+
+        pager_open(arg_pager_flags);
+
+        printf("%s [OPTIONS...] COMMAND ...\n\n"
+               "%sIntrospect the D-Bus IPC bus.%s\n"
+               "\nCommands:\n"
+               "  list                     List bus names\n"
+               "  status [SERVICE]         Show bus service, process or bus owner credentials\n"
+               "  monitor [SERVICE...]     Show bus traffic\n"
+               "  capture [SERVICE...]     Capture bus traffic as pcap\n"
+               "  tree [SERVICE...]        Show object tree of service\n"
+               "  introspect SERVICE OBJECT [INTERFACE]\n"
+               "  call SERVICE OBJECT INTERFACE METHOD [SIGNATURE [ARGUMENT...]]\n"
+               "                           Call a method\n"
+               "  emit OBJECT INTERFACE SIGNAL [SIGNATURE [ARGUMENT...]]\n"
+               "                           Emit a signal\n"
+               "  get-property SERVICE OBJECT INTERFACE PROPERTY...\n"
+               "                           Get property value\n"
+               "  set-property SERVICE OBJECT INTERFACE PROPERTY SIGNATURE ARGUMENT...\n"
+               "                           Set property value\n"
+               "  help                     Show this help\n"
+               "\nOptions:\n"
+               "  -h --help                Show this help\n"
+               "     --version             Show package version\n"
+               "     --no-pager            Do not pipe output into a pager\n"
+               "     --no-legend           Do not show the headers and footers\n"
+               "  -l --full                Do not ellipsize output\n"
+               "     --system              Connect to system bus\n"
+               "     --user                Connect to user bus\n"
+               "  -H --host=[USER@]HOST    Operate on remote host\n"
+               "  -M --machine=CONTAINER   Operate on local container\n"
+               "     --address=ADDRESS     Connect to bus specified by address\n"
+               "     --show-machine        Show machine ID column in list\n"
+               "     --unique              Only show unique names\n"
+               "     --acquired            Only show acquired names\n"
+               "     --activatable         Only show activatable names\n"
+               "     --match=MATCH         Only show matching messages\n"
+               "     --size=SIZE           Maximum length of captured packet\n"
+               "     --list                Don't show tree, but simple object path list\n"
+               "  -q --quiet               Don't show method call reply\n"
+               "     --verbose             Show result values in long format\n"
+               "     --json=MODE           Output as JSON\n"
+               "  -j                       Same as --json=pretty on tty, --json=short otherwise\n"
+               "     --xml-interface       Dump the XML description in introspect command\n"
+               "     --expect-reply=BOOL   Expect a method call reply\n"
+               "     --auto-start=BOOL     Auto-start destination service\n"
+               "     --allow-interactive-authorization=BOOL\n"
+               "                           Allow interactive authorization for operation\n"
+               "     --timeout=SECS        Maximum time to wait for method call completion\n"
+               "     --augment-creds=BOOL  Extend credential data with data read from /proc/$PID\n"
+               "     --watch-bind=BOOL     Wait for bus AF_UNIX socket to be bound in the file\n"
+               "                           system\n"
+               "     --destination=SERVICE Destination service of a signal\n"
+               "\nSee the %s for details.\n",
+               program_invocation_short_name,
+               ansi_highlight(),
+               ansi_normal(),
+               link);
+
+        return 0;
+}
+
+static int verb_help(int argc, char **argv, void *userdata) {
+        return help();
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+        enum {
+                ARG_VERSION = 0x100,
+                ARG_NO_PAGER,
+                ARG_NO_LEGEND,
+                ARG_SYSTEM,
+                ARG_USER,
+                ARG_ADDRESS,
+                ARG_MATCH,
+                ARG_SHOW_MACHINE,
+                ARG_UNIQUE,
+                ARG_ACQUIRED,
+                ARG_ACTIVATABLE,
+                ARG_SIZE,
+                ARG_LIST,
+                ARG_VERBOSE,
+                ARG_XML_INTERFACE,
+                ARG_EXPECT_REPLY,
+                ARG_AUTO_START,
+                ARG_ALLOW_INTERACTIVE_AUTHORIZATION,
+                ARG_TIMEOUT,
+                ARG_AUGMENT_CREDS,
+                ARG_WATCH_BIND,
+                ARG_JSON,
+                ARG_DESTINATION,
+        };
+
+        static const struct option options[] = {
+                { "help",                            no_argument,       NULL, 'h'                                 },
+                { "version",                         no_argument,       NULL, ARG_VERSION                         },
+                { "no-pager",                        no_argument,       NULL, ARG_NO_PAGER                        },
+                { "no-legend",                       no_argument,       NULL, ARG_NO_LEGEND                       },
+                { "full",                            no_argument,       NULL, 'l'                                 },
+                { "system",                          no_argument,       NULL, ARG_SYSTEM                          },
+                { "user",                            no_argument,       NULL, ARG_USER                            },
+                { "address",                         required_argument, NULL, ARG_ADDRESS                         },
+                { "show-machine",                    no_argument,       NULL, ARG_SHOW_MACHINE                    },
+                { "unique",                          no_argument,       NULL, ARG_UNIQUE                          },
+                { "acquired",                        no_argument,       NULL, ARG_ACQUIRED                        },
+                { "activatable",                     no_argument,       NULL, ARG_ACTIVATABLE                     },
+                { "match",                           required_argument, NULL, ARG_MATCH                           },
+                { "host",                            required_argument, NULL, 'H'                                 },
+                { "machine",                         required_argument, NULL, 'M'                                 },
+                { "size",                            required_argument, NULL, ARG_SIZE                            },
+                { "list",                            no_argument,       NULL, ARG_LIST                            },
+                { "quiet",                           no_argument,       NULL, 'q'                                 },
+                { "verbose",                         no_argument,       NULL, ARG_VERBOSE                         },
+                { "xml-interface",                   no_argument,       NULL, ARG_XML_INTERFACE                   },
+                { "expect-reply",                    required_argument, NULL, ARG_EXPECT_REPLY                    },
+                { "auto-start",                      required_argument, NULL, ARG_AUTO_START                      },
+                { "allow-interactive-authorization", required_argument, NULL, ARG_ALLOW_INTERACTIVE_AUTHORIZATION },
+                { "timeout",                         required_argument, NULL, ARG_TIMEOUT                         },
+                { "augment-creds",                   required_argument, NULL, ARG_AUGMENT_CREDS                   },
+                { "watch-bind",                      required_argument, NULL, ARG_WATCH_BIND                      },
+                { "json",                            required_argument, NULL, ARG_JSON                            },
+                { "destination",                     required_argument, NULL, ARG_DESTINATION                     },
+                {},
+        };
+
+        int c, r;
+
+        assert(argc >= 0);
+        assert(argv);
+
+        while ((c = getopt_long(argc, argv, "hH:M:qjl", options, NULL)) >= 0)
+
+                switch (c) {
+
+                case 'h':
+                        return help();
+
+                case ARG_VERSION:
+                        return version();
+
+                case ARG_NO_PAGER:
+                        arg_pager_flags |= PAGER_DISABLE;
+                        break;
+
+                case ARG_NO_LEGEND:
+                        arg_legend = false;
+                        break;
+
+                case 'l':
+                        arg_full = true;
+                        break;
+
+                case ARG_USER:
+                        arg_user = true;
+                        break;
+
+                case ARG_SYSTEM:
+                        arg_user = false;
+                        break;
+
+                case ARG_ADDRESS:
+                        arg_address = optarg;
+                        break;
+
+                case ARG_SHOW_MACHINE:
+                        arg_show_machine = true;
+                        break;
+
+                case ARG_UNIQUE:
+                        arg_unique = true;
+                        break;
+
+                case ARG_ACQUIRED:
+                        arg_acquired = true;
+                        break;
+
+                case ARG_ACTIVATABLE:
+                        arg_activatable = true;
+                        break;
+
+                case ARG_MATCH:
+                        if (strv_extend(&arg_matches, optarg) < 0)
+                                return log_oom();
+                        break;
+
+                case ARG_SIZE: {
+                        uint64_t sz;
+
+                        r = parse_size(optarg, 1024, &sz);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse size '%s': %m", optarg);
+
+                        if ((uint64_t) (size_t) sz !=  sz)
+                                return log_error_errno(SYNTHETIC_ERRNO(E2BIG),
+                                                       "Size out of range.");
+
+                        arg_snaplen = (size_t) sz;
+                        break;
+                }
+
+                case ARG_LIST:
+                        arg_list = true;
+                        break;
+
+                case 'H':
+                        arg_transport = BUS_TRANSPORT_REMOTE;
+                        arg_host = optarg;
+                        break;
+
+                case 'M':
+                        arg_transport = BUS_TRANSPORT_MACHINE;
+                        arg_host = optarg;
+                        break;
+
+                case 'q':
+                        arg_quiet = true;
+                        break;
+
+                case ARG_VERBOSE:
+                        arg_verbose = true;
+                        break;
+
+                case ARG_XML_INTERFACE:
+                        arg_xml_interface = true;
+                        break;
+
+                case ARG_EXPECT_REPLY:
+                        r = parse_boolean_argument("--expect-reply=", optarg, &arg_expect_reply);
+                        if (r < 0)
+                                return r;
+                        break;
+
+                case ARG_AUTO_START:
+                        r = parse_boolean_argument("--auto-start=", optarg, &arg_auto_start);
+                        if (r < 0)
+                                return r;
+                        break;
+
+                case ARG_ALLOW_INTERACTIVE_AUTHORIZATION:
+                        r = parse_boolean_argument("--allow-interactive-authorization=", optarg,
+                                                   &arg_allow_interactive_authorization);
+                        if (r < 0)
+                                return r;
+                        break;
+
+                case ARG_TIMEOUT:
+                        r = parse_sec(optarg, &arg_timeout);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse --timeout= parameter '%s': %m", optarg);
+
+                        break;
+
+                case ARG_AUGMENT_CREDS:
+                        r = parse_boolean_argument("--augment-creds=", optarg, &arg_augment_creds);
+                        if (r < 0)
+                                return r;
+                        break;
+
+                case ARG_WATCH_BIND:
+                        r = parse_boolean_argument("--watch-bind=", optarg, &arg_watch_bind);
+                        if (r < 0)
+                                return r;
+                        break;
+
+                case 'j':
+                        arg_json_format_flags = JSON_FORMAT_PRETTY_AUTO|JSON_FORMAT_COLOR_AUTO;
+                        break;
+
+                case ARG_JSON:
+                        r = parse_json_argument(optarg, &arg_json_format_flags);
+                        if (r <= 0)
+                                return r;
+
+                        break;
+
+                case ARG_DESTINATION:
+                        arg_destination = optarg;
+                        break;
+
+                case '?':
+                        return -EINVAL;
+
+                default:
+                        assert_not_reached();
+                }
+
+        if (arg_full < 0)
+                arg_full = terminal_is_dumb();
+
+        return 1;
+}
+
+static int busctl_main(int argc, char *argv[]) {
+        static const Verb verbs[] = {
+                { "list",         VERB_ANY, 1,        VERB_DEFAULT, list_bus_names },
+                { "status",       VERB_ANY, 2,        0,            status         },
+                { "monitor",      VERB_ANY, VERB_ANY, 0,            verb_monitor   },
+                { "capture",      VERB_ANY, VERB_ANY, 0,            verb_capture   },
+                { "tree",         VERB_ANY, VERB_ANY, 0,            tree           },
+                { "introspect",   3,        4,        0,            introspect     },
+                { "call",         5,        VERB_ANY, 0,            call           },
+                { "emit",         4,        VERB_ANY, 0,            emit_signal    },
+                { "get-property", 5,        VERB_ANY, 0,            get_property   },
+                { "set-property", 6,        VERB_ANY, 0,            set_property   },
+                { "help",         VERB_ANY, VERB_ANY, 0,            verb_help      },
+                {}
+        };
+
+        return dispatch_verb(argc, argv, verbs, NULL);
+}
+
+static int run(int argc, char *argv[]) {
+        int r;
+
+        log_setup();
+
+        r = parse_argv(argc, argv);
+        if (r <= 0)
+                return r;
+
+        return busctl_main(argc, argv);
+}
+
+DEFINE_MAIN_FUNCTION(run);
diff --git a/src/busctl/meson.build b/src/busctl/meson.build
new file mode 100644
index 0000000..295dc09
--- /dev/null
+++ b/src/busctl/meson.build
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+busctl_sources = files(
+        'busctl-introspect.c',
+        'busctl-introspect.h',
+        'busctl.c')
+
+tests += [
+        [files('test-busctl-introspect.c',
+               'busctl-introspect.c',
+               'busctl-introspect.h')],
+]
diff --git a/src/busctl/test-busctl-introspect.c b/src/busctl/test-busctl-introspect.c
new file mode 100644
index 0000000..859ca71
--- /dev/null
+++ b/src/busctl/test-busctl-introspect.c
@@ -0,0 +1,364 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "busctl-introspect.h"
+#include "set.h"
+#include "strv.h"
+#include "tests.h"
+
+static const char *xml_root =
+        "<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\"\n\"https://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
+                  "<node>\n"
+                  " <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"
+                  " <interface name=\"org.freedesktop.DBus.Introspectable\">\n"
+                  "  <method name=\"Introspect\">\n"
+                  "   <arg name=\"data\" type=\"s\" direction=\"out\"/>\n"
+                  "  </method>\n"
+                  " </interface>\n"
+                  " <interface name=\"org.freedesktop.DBus.Properties\">\n"
+                  "  <method name=\"Get\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"value\" direction=\"out\" type=\"v\"/>\n"
+                  "  </method>\n"
+                  "  <method name=\"GetAll\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"properties\" direction=\"out\" type=\"a{sv}\"/>\n"
+                  "  </method>\n"
+                  "  <method name=\"Set\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"value\" direction=\"in\" type=\"v\"/>\n"
+                  "  </method>\n"
+                  "  <signal name=\"PropertiesChanged\">\n"
+                  "   <arg type=\"s\" name=\"interface\"/>\n"
+                  "   <arg type=\"a{sv}\" name=\"changed_properties\"/>\n"
+                  "   <arg type=\"as\" name=\"invalidated_properties\"/>\n"
+                  "  </signal>\n"
+                  " </interface>\n"
+                  " <node name=\"org\"/>\n"
+                  "</node>\n";
+
+static const char *xml_org =
+        "<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\"\n\"https://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
+                  "<node>\n"
+                  " <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"
+                  " <interface name=\"org.freedesktop.DBus.Introspectable\">\n"
+                  "  <method name=\"Introspect\">\n"
+                  "   <arg name=\"data\" type=\"s\" direction=\"out\"/>\n"
+                  "  </method>\n"
+                  " </interface>\n"
+                  " <interface name=\"org.freedesktop.DBus.Properties\">\n"
+                  "  <method name=\"Get\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"value\" direction=\"out\" type=\"v\"/>\n"
+                  "  </method>\n"
+                  "  <method name=\"GetAll\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"properties\" direction=\"out\" type=\"a{sv}\"/>\n"
+                  "  </method>\n"
+                  "  <method name=\"Set\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"value\" direction=\"in\" type=\"v\"/>\n"
+                  "  </method>\n"
+                  "  <signal name=\"PropertiesChanged\">\n"
+                  "   <arg type=\"s\" name=\"interface\"/>\n"
+                  "   <arg type=\"a{sv}\" name=\"changed_properties\"/>\n"
+                  "   <arg type=\"as\" name=\"invalidated_properties\"/>\n"
+                  "  </signal>\n"
+                  " </interface>\n"
+                  " <node name=\"freedesktop\"/>\n"
+                  "</node>\n";
+
+static const char *xml_org_freedesktop =
+        "<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\"\n\"https://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
+                  "<node>\n"
+                  " <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"
+                  " <interface name=\"org.freedesktop.DBus.Introspectable\">\n"
+                  "  <method name=\"Introspect\">\n"
+                  "   <arg name=\"data\" type=\"s\" direction=\"out\"/>\n"
+                  "  </method>\n"
+                  " </interface>\n"
+                  " <interface name=\"org.freedesktop.DBus.Properties\">\n"
+                  "  <method name=\"Get\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"value\" direction=\"out\" type=\"v\"/>\n"
+                  "  </method>\n"
+                  "  <method name=\"GetAll\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"properties\" direction=\"out\" type=\"a{sv}\"/>\n"
+                  "  </method>\n"
+                  "  <method name=\"Set\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"value\" direction=\"in\" type=\"v\"/>\n"
+                  "  </method>\n"
+                  "  <signal name=\"PropertiesChanged\">\n"
+                  "   <arg type=\"s\" name=\"interface\"/>\n"
+                  "   <arg type=\"a{sv}\" name=\"changed_properties\"/>\n"
+                  "   <arg type=\"as\" name=\"invalidated_properties\"/>\n"
+                  "  </signal>\n"
+                  " </interface>\n"
+                  " <node name=\"LogControl1\"/>\n"
+                  " <node name=\"network1\"/>\n"
+                  "</node>\n";
+
+static const char *xml_org_freedesktop_LogControl1 =
+        "<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\"\n\"https://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
+                  "<node>\n"
+                  " <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"
+                  " <interface name=\"org.freedesktop.DBus.Introspectable\">\n"
+                  "  <method name=\"Introspect\">\n"
+                  "   <arg name=\"data\" type=\"s\" direction=\"out\"/>\n"
+                  "  </method>\n"
+                  " </interface>\n"
+                  " <interface name=\"org.freedesktop.DBus.Properties\">\n"
+                  "  <method name=\"Get\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"value\" direction=\"out\" type=\"v\"/>\n"
+                  "  </method>\n"
+                  "  <method name=\"GetAll\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"properties\" direction=\"out\" type=\"a{sv}\"/>\n"
+                  "  </method>\n"
+                  "  <method name=\"Set\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"value\" direction=\"in\" type=\"v\"/>\n"
+                  "  </method>\n"
+                  "  <signal name=\"PropertiesChanged\">\n"
+                  "   <arg type=\"s\" name=\"interface\"/>\n"
+                  "   <arg type=\"a{sv}\" name=\"changed_properties\"/>\n"
+                  "   <arg type=\"as\" name=\"invalidated_properties\"/>\n"
+                  "  </signal>\n"
+                  " </interface>\n"
+                  "<interface name=\"org.freedesktop.LogControl1\">\n"
+                  "  <property name=\"LogLevel\" type=\"s\" access=\"readwrite\">\n"
+                  "   <annotation name=\"org.freedesktop.DBus.Property.EmitsChangedSignal\" value=\"false\"/>\n"
+                  "   <annotation name=\"org.freedesktop.systemd1.Privileged\" value=\"true\"/>\n"
+                  "  </property>\n"
+                  "  <property name=\"LogTarget\" type=\"s\" access=\"readwrite\">\n"
+                  "   <annotation name=\"org.freedesktop.DBus.Property.EmitsChangedSignal\" value=\"false\"/>\n"
+                  "   <annotation name=\"org.freedesktop.systemd1.Privileged\" value=\"true\"/>\n"
+                  "  </property>\n"
+                  "  <property name=\"SyslogIdentifier\" type=\"s\" access=\"read\">\n"
+                  "   <annotation name=\"org.freedesktop.DBus.Property.EmitsChangedSignal\" value=\"false\"/>\n"
+                  "  </property>\n"
+                  " </interface>\n"
+                  "</node>\n";
+
+static const char *xml_org_freedesktop_network1 =
+        "<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\"\n\"https://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
+                  "<node>\n"
+                  " <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"
+                  " <interface name=\"org.freedesktop.DBus.Introspectable\">\n"
+                  "  <method name=\"Introspect\">\n"
+                  "   <arg name=\"data\" type=\"s\" direction=\"out\"/>\n"
+                  "  </method>\n"
+                  " </interface>\n"
+                  " <interface name=\"org.freedesktop.DBus.Properties\">\n"
+                  "  <method name=\"Get\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"value\" direction=\"out\" type=\"v\"/>\n"
+                  "  </method>\n"
+                  "  <method name=\"GetAll\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"properties\" direction=\"out\" type=\"a{sv}\"/>\n"
+                  "  </method>\n"
+                  "  <method name=\"Set\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"value\" direction=\"in\" type=\"v\"/>\n"
+                  "  </method>\n"
+                  "  <signal name=\"PropertiesChanged\">\n"
+                  "   <arg type=\"s\" name=\"interface\"/>\n"
+                  "   <arg type=\"a{sv}\" name=\"changed_properties\"/>\n"
+                  "   <arg type=\"as\" name=\"invalidated_properties\"/>\n"
+                  "  </signal>\n"
+                  " </interface>\n"
+                  " <node name=\"network\"/>\n"
+                  "</node>\n";
+
+static const char *xml_org_freedesktop_network1_network =
+        "<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\"\n\"https://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
+                  "<node>\n"
+                  " <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"
+                  " <interface name=\"org.freedesktop.DBus.Introspectable\">\n"
+                  "  <method name=\"Introspect\">\n"
+                  "   <arg name=\"data\" type=\"s\" direction=\"out\"/>\n"
+                  "  </method>\n"
+                  " </interface>\n"
+                  " <interface name=\"org.freedesktop.DBus.Properties\">\n"
+                  "  <method name=\"Get\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"value\" direction=\"out\" type=\"v\"/>\n"
+                  "  </method>\n"
+                  "  <method name=\"GetAll\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"properties\" direction=\"out\" type=\"a{sv}\"/>\n"
+                  "  </method>\n"
+                  "  <method name=\"Set\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"value\" direction=\"in\" type=\"v\"/>\n"
+                  "  </method>\n"
+                  "  <signal name=\"PropertiesChanged\">\n"
+                  "   <arg type=\"s\" name=\"interface\"/>\n"
+                  "   <arg type=\"a{sv}\" name=\"changed_properties\"/>\n"
+                  "   <arg type=\"as\" name=\"invalidated_properties\"/>\n"
+                  "  </signal>\n"
+                  " </interface>\n"
+                  " <node name=\"0\"/>\n"
+                  " <node name=\"1\"/>\n"
+                  " <node name=\"2\"/>\n"
+                  " <node name=\"3\"/>\n"
+                  " <node name=\"4\"/>\n"
+                  " <node name=\"5\"/>\n"
+                  " <node name=\"6\"/>\n"
+                  " <node name=\"7\"/>\n"
+                  " <node name=\"8\"/>\n"
+                  " <node name=\"9\"/>\n"
+                  " <node name=\"10\"/>\n"
+                  " <node name=\"11\"/>\n"
+                  " <node name=\"12\"/>\n"
+                  " <node name=\"13\"/>\n"
+                  " <node name=\"14\"/>\n"
+                  " <node name=\"15\"/>\n"
+                  " <node name=\"16\"/>\n"
+                  " <node name=\"17\"/>\n"
+                  " <node name=\"18\"/>\n"
+                  " <node name=\"19\"/>\n"
+                  " <node name=\"20\"/>\n"
+                  "</node>\n";
+
+static const char *xml_org_freedesktop_network1_network_unsigned =
+        "<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\"\n\"https://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
+                  "<node>\n"
+                  " <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"
+                  " <interface name=\"org.freedesktop.DBus.Introspectable\">\n"
+                  "  <method name=\"Introspect\">\n"
+                  "   <arg name=\"data\" type=\"s\" direction=\"out\"/>\n"
+                  "  </method>\n"
+                  " </interface>\n"
+                  " <interface name=\"org.freedesktop.DBus.Properties\">\n"
+                  "  <method name=\"Get\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"value\" direction=\"out\" type=\"v\"/>\n"
+                  "  </method>\n"
+                  "  <method name=\"GetAll\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"properties\" direction=\"out\" type=\"a{sv}\"/>\n"
+                  "  </method>\n"
+                  "  <method name=\"Set\">\n"
+                  "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"
+                  "   <arg name=\"value\" direction=\"in\" type=\"v\"/>\n"
+                  "  </method>\n"
+                  "  <signal name=\"PropertiesChanged\">\n"
+                  "   <arg type=\"s\" name=\"interface\"/>\n"
+                  "   <arg type=\"a{sv}\" name=\"changed_properties\"/>\n"
+                  "   <arg type=\"as\" name=\"invalidated_properties\"/>\n"
+                  "  </signal>\n"
+                  " </interface>\n"
+                  " <node name=\"hoge\"/>\n"
+                  "</node>\n";
+
+static int on_path(const char *path, void *userdata) {
+        Set *paths = userdata;
+
+        assert_se(paths);
+        assert_se(set_put_strdup(&paths, path) >= 0);
+
+        return 0;
+}
+
+TEST(introspect_on_path) {
+        static const XMLIntrospectOps ops = {
+                .on_path = on_path,
+        };
+        _cleanup_strv_free_ char **expected = NULL;
+        _cleanup_set_free_ Set *paths = NULL;
+        _cleanup_free_ char **l = NULL;
+
+        assert_se(set_put_strdup(&paths, "/") > 0);
+
+        log_debug("/* parse_xml_introspect(\"/\") */");
+        assert_se(parse_xml_introspect("/", xml_root, &ops, paths) >= 0);
+        log_debug("/* parse_xml_introspect(\"/org\") */");
+        assert_se(parse_xml_introspect("/org", xml_org, &ops, paths) >= 0);
+        log_debug("/* parse_xml_introspect(\"/org/freedesktop\") */");
+        assert_se(parse_xml_introspect("/org/freedesktop", xml_org_freedesktop, &ops, paths) >= 0);
+        log_debug("/* parse_xml_introspect(\"/org/freedesktop/LogControl1\") */");
+        assert_se(parse_xml_introspect("/org/freedesktop/LogControl1", xml_org_freedesktop_LogControl1, &ops, paths) >= 0);
+        log_debug("/* parse_xml_introspect(\"/org/freedesktop/network1\") */");
+        assert_se(parse_xml_introspect("/org/freedesktop/network1", xml_org_freedesktop_network1, &ops, paths) >= 0);
+        log_debug("/* parse_xml_introspect(\"/org/freedesktop/network1/network\") */");
+        assert_se(parse_xml_introspect("/org/freedesktop/network1/network", xml_org_freedesktop_network1_network, &ops, paths) >= 0);
+        for (unsigned i = 0; i <= 20; i++) {
+                _cleanup_free_ char *path = NULL;
+
+                assert_se(asprintf(&path, "/org/freedesktop/network1/network/%u", i) >= 0);
+                log_debug("/* parse_xml_introspect(\"%s\") */", path);
+                assert_se(parse_xml_introspect(path, xml_org_freedesktop_network1_network_unsigned, &ops, paths) >= 0);
+        }
+
+        assert_se(l = set_get_strv(paths));
+        strv_sort(l);
+
+        assert_se(strv_extend(&expected, "/") >= 0);
+        assert_se(strv_extend(&expected, "/org") >= 0);
+        assert_se(strv_extend(&expected, "/org/freedesktop") >= 0);
+        assert_se(strv_extend(&expected, "/org/freedesktop/LogControl1") >= 0);
+        assert_se(strv_extend(&expected, "/org/freedesktop/network1") >= 0);
+        assert_se(strv_extend(&expected, "/org/freedesktop/network1/network") >= 0);
+        for (unsigned i = 0; i <= 20; i++) {
+                assert_se(strv_extendf(&expected, "/org/freedesktop/network1/network/%u", i) >= 0);
+                assert_se(strv_extendf(&expected, "/org/freedesktop/network1/network/%u/hoge", i) >= 0);
+        }
+
+        strv_sort(expected);
+        assert_se(strv_equal(l, expected));
+}
+
+DEFINE_TEST_MAIN(LOG_DEBUG);