bus: calculate bloom filter for match

Yay! Filtering using kernel bloom filter matches works now! Yippieh!

11 files changed, 306 insertions, 132 deletions

diff --git a/TODO b/TODO
index fb5f0c3813..561e7ceb39 100644
--- a/TODO
+++ b/TODO
@@ -43,6 +43,8 @@ Features:
   - move to gvariant
   - merge busctl into systemctl or so?
   - synthesize sd_bus_message objects from kernel messages
+  - properly implement name registry ioctls for kdbus
+  - get rid of object hash table, use decision tree instead?
 
 * in the final killing spree, detect processes from the root directory, and
   complain loudly if they have argv[0][0] == '@' set.
diff --git a/src/libsystemd-bus/bus-control.c b/src/libsystemd-bus/bus-control.c
index 177bd882ad..ae0d7f9767 100644
--- a/src/libsystemd-bus/bus-control.c
+++ b/src/libsystemd-bus/bus-control.c
@@ -32,6 +32,7 @@
 #include "bus-internal.h"
 #include "bus-message.h"
 #include "bus-control.h"
+#include "bus-bloom.h"
 
 int sd_bus_get_unique_name(sd_bus *bus, const char **unique) {
         int r;
@@ -339,36 +340,174 @@ int sd_bus_get_owner_pid(sd_bus *bus, const char *name, pid_t *pid) {
         return 0;
 }
 
-int bus_add_match_internal(sd_bus *bus, const char *match) {
+int bus_add_match_internal(
+                sd_bus *bus,
+                const char *match,
+                struct bus_match_component *components,
+                unsigned n_components,
+                uint64_t cookie) {
+
+        int r;
+
         assert(bus);
         assert(match);
 
-        return sd_bus_call_method(
-                        bus,
-                        "org.freedesktop.DBus",
-                        "/",
-                        "org.freedesktop.DBus",
-                        "AddMatch",
-                        NULL,
-                        NULL,
-                        "s",
-                        match);
+        if (bus->is_kernel) {
+                struct kdbus_cmd_match *m;
+                struct kdbus_item *item;
+                uint64_t bloom[BLOOM_SIZE/8];
+                size_t sz;
+                const char *sender = NULL;
+                size_t sender_length = 0;
+                uint64_t src_id = KDBUS_MATCH_SRC_ID_ANY;
+                bool using_bloom = false;
+                unsigned i;
+
+                zero(bloom);
+
+                sz = offsetof(struct kdbus_cmd_match, items);
+
+                for (i = 0; i < n_components; i++) {
+                        struct bus_match_component *c = &components[i];
+
+                        switch (c->type) {
+
+                        case BUS_MATCH_SENDER:
+                                r = bus_kernel_parse_unique_name(c->value_str, &src_id);
+                                if (r < 0)
+                                        return r;
+
+                                if (r > 0) {
+                                        sender = c->value_str;
+                                        sender_length = strlen(sender);
+                                        sz += ALIGN8(offsetof(struct kdbus_item, str) + sender_length + 1);
+                                }
+
+                                break;
+
+                        case BUS_MATCH_DESTINATION:
+                                /* The bloom filter does not include
+                                   the destination, since it is only
+                                   available for broadcast messages
+                                   which do not carry a destination
+                                   since they are undirected. */
+                                break;
+
+                        case BUS_MATCH_INTERFACE:
+                                bloom_add_pair(bloom, "interface", c->value_str);
+                                using_bloom = true;
+                                break;
+
+                        case BUS_MATCH_MEMBER:
+                                bloom_add_pair(bloom, "member", c->value_str);
+                                using_bloom = true;
+                                break;
+
+                        case BUS_MATCH_PATH:
+                                bloom_add_pair(bloom, "path", c->value_str);
+                                using_bloom = true;
+                                break;
+
+                        case BUS_MATCH_PATH_NAMESPACE:
+                                bloom_add_pair(bloom, "path-slash-prefix", c->value_str);
+                                using_bloom = true;
+                                break;
+
+                        case BUS_MATCH_ARG...BUS_MATCH_ARG_LAST:
+                        case BUS_MATCH_ARG_PATH...BUS_MATCH_ARG_PATH_LAST:
+                        case BUS_MATCH_ARG_NAMESPACE...BUS_MATCH_ARG_NAMESPACE_LAST:
+                        case BUS_MATCH_MESSAGE_TYPE:
+                                assert_not_reached("FIXME!");
+                                break;
+
+                        case BUS_MATCH_ROOT:
+                        case BUS_MATCH_VALUE:
+                        case BUS_MATCH_LEAF:
+                        case _BUS_MATCH_NODE_TYPE_MAX:
+                        case _BUS_MATCH_NODE_TYPE_INVALID:
+                                assert_not_reached("Invalid match type?");
+                        }
+                }
+
+                if (using_bloom)
+                        sz += ALIGN8(offsetof(struct kdbus_item, data64) + BLOOM_SIZE);
+
+                m = alloca0(sz);
+                m->size = sz;
+                m->cookie = cookie;
+                m->src_id = src_id;
+
+                item = m->items;
+
+                if (using_bloom) {
+                        item->size = offsetof(struct kdbus_item, data64) + BLOOM_SIZE;
+                        item->type = KDBUS_MATCH_BLOOM;
+                        memcpy(item->data64, bloom, BLOOM_SIZE);
+
+                        item = KDBUS_ITEM_NEXT(item);
+                }
+
+                if (sender) {
+                        item->size = offsetof(struct kdbus_item, str) + sender_length + 1;
+                        item->type = KDBUS_MATCH_SRC_NAME;
+                        memcpy(item->str, sender, sender_length + 1);
+                }
+
+                r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
+                if (r < 0)
+                        return -errno;
+
+        } else {
+                return sd_bus_call_method(
+                                bus,
+                                "org.freedesktop.DBus",
+                                "/",
+                                "org.freedesktop.DBus",
+                                "AddMatch",
+                                NULL,
+                                NULL,
+                                "s",
+                                match);
+        }
+
+        return 0;
 }
 
-int bus_remove_match_internal(sd_bus *bus, const char *match) {
+int bus_remove_match_internal(
+                sd_bus *bus,
+                const char *match,
+                uint64_t cookie) {
+
+        int r;
+
         assert(bus);
         assert(match);
 
-        return sd_bus_call_method(
-                        bus,
-                        "org.freedesktop.DBus",
-                        "/",
-                        "org.freedesktop.DBus",
-                        "RemoveMatch",
-                        NULL,
-                        NULL,
-                        "s",
-                        match);
+        if (bus->is_kernel) {
+                struct kdbus_cmd_match m;
+
+                zero(m);
+                m.size = offsetof(struct kdbus_cmd_match, items);
+                m.cookie = cookie;
+
+                r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_REMOVE, &m);
+                if (r < 0)
+                        return -errno;
+
+        } else {
+                return sd_bus_call_method(
+                                bus,
+                                "org.freedesktop.DBus",
+                                "/",
+                                "org.freedesktop.DBus",
+                                "RemoveMatch",
+                                NULL,
+                                NULL,
+                                "s",
+                                match);
+        }
+
+        return 0;
 }
 
 int sd_bus_get_owner_machine_id(sd_bus *bus, const char *name, sd_id128_t *machine) {
diff --git a/src/libsystemd-bus/bus-control.h b/src/libsystemd-bus/bus-control.h
index 34ecb260c3..2cac5d83ae 100644
--- a/src/libsystemd-bus/bus-control.h
+++ b/src/libsystemd-bus/bus-control.h
@@ -23,5 +23,5 @@
 
 #include "sd-bus.h"
 
-int bus_add_match_internal(sd_bus *bus, const char *match);
-int bus_remove_match_internal(sd_bus *bus, const char *match);
+int bus_add_match_internal(sd_bus *bus, const char *match, struct bus_match_component *components, unsigned n_components, uint64_t cookie);
+int bus_remove_match_internal(sd_bus *bus, const char *match, uint64_t cookie);
diff --git a/src/libsystemd-bus/bus-internal.h b/src/libsystemd-bus/bus-internal.h
index e775b09419..147a83c045 100644
--- a/src/libsystemd-bus/bus-internal.h
+++ b/src/libsystemd-bus/bus-internal.h
@@ -182,6 +182,8 @@ struct sd_bus {
         pid_t original_pid;
 
         uint64_t hello_flags;
+
+        uint64_t match_cookie;
 };
 
 static inline void bus_unrefp(sd_bus **b) {
diff --git a/src/libsystemd-bus/bus-kernel.c b/src/libsystemd-bus/bus-kernel.c
index 50b28e7281..33c25a4fd9 100644
--- a/src/libsystemd-bus/bus-kernel.c
+++ b/src/libsystemd-bus/bus-kernel.c
@@ -34,18 +34,7 @@
 #include "bus-kernel.h"
 #include "bus-bloom.h"
 
-#define KDBUS_ITEM_NEXT(item) \
-        (typeof(item))(((uint8_t *)item) + ALIGN8((item)->size))
-
-#define KDBUS_ITEM_FOREACH(item, head)                                          \
-        for (item = (head)->items;                                              \
-             (uint8_t *)(item) < (uint8_t *)(head) + (head)->size;              \
-             item = KDBUS_ITEM_NEXT(item))
-
-#define KDBUS_ITEM_HEADER_SIZE offsetof(struct kdbus_item, data)
-#define KDBUS_ITEM_SIZE(s) ALIGN8((s) + KDBUS_ITEM_HEADER_SIZE)
-
-static int parse_unique_name(const char *s, uint64_t *id) {
+int bus_kernel_parse_unique_name(const char *s, uint64_t *id) {
         int r;
 
         assert(s);
@@ -215,7 +204,7 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
                 return 0;
 
         if (m->destination) {
-                r = parse_unique_name(m->destination, &unique);
+                r = bus_kernel_parse_unique_name(m->destination, &unique);
                 if (r < 0)
                         return r;
 
diff --git a/src/libsystemd-bus/bus-kernel.h b/src/libsystemd-bus/bus-kernel.h
index 8cf153ab41..dddecfb210 100644
--- a/src/libsystemd-bus/bus-kernel.h
+++ b/src/libsystemd-bus/bus-kernel.h
@@ -23,6 +23,17 @@
 
 #include "sd-bus.h"
 
+#define KDBUS_ITEM_NEXT(item) \
+        (typeof(item))(((uint8_t *)item) + ALIGN8((item)->size))
+
+#define KDBUS_ITEM_FOREACH(item, head)                                          \
+        for (item = (head)->items;                                              \
+             (uint8_t *)(item) < (uint8_t *)(head) + (head)->size;              \
+             item = KDBUS_ITEM_NEXT(item))
+
+#define KDBUS_ITEM_HEADER_SIZE offsetof(struct kdbus_item, data)
+#define KDBUS_ITEM_SIZE(s) ALIGN8((s) + KDBUS_ITEM_HEADER_SIZE)
+
 #define MEMFD_CACHE_MAX 32
 
 /* When we cache a memfd block for reuse, we will truncate blocks
@@ -55,3 +66,5 @@ int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *size);
 void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t size);
 
 void bus_kernel_flush_memfd(sd_bus *bus);
+
+int bus_kernel_parse_unique_name(const char *s, uint64_t *id);
diff --git a/src/libsystemd-bus/bus-match.c b/src/libsystemd-bus/bus-match.c
index ed871d9d77..95e625be09 100644
--- a/src/libsystemd-bus/bus-match.c
+++ b/src/libsystemd-bus/bus-match.c
@@ -255,10 +255,11 @@ int bus_match_run(
                         return r;
 
                 /* Run the callback. And then invoke siblings. */
-                assert(node->leaf.callback);
-                r = node->leaf.callback(bus, m, node->leaf.userdata);
-                if (r != 0)
-                        return r;
+                if (node->leaf.callback) {
+                        r = node->leaf.callback(bus, m, node->leaf.userdata);
+                        if (r != 0)
+                                return r;
+                }
 
                 return bus_match_run(bus, node->next, m);
 
@@ -499,6 +500,7 @@ static int bus_match_add_leaf(
                 struct bus_match_node *where,
                 sd_bus_message_handler_t callback,
                 void *userdata,
+                uint64_t cookie,
                 struct bus_match_node **ret) {
 
         struct bus_match_node *n;
@@ -518,6 +520,7 @@ static int bus_match_add_leaf(
                 n->next->prev = n;
         n->leaf.callback = callback;
         n->leaf.userdata = userdata;
+        n->leaf.cookie = cookie;
 
         where->child = n;
 
@@ -648,14 +651,8 @@ enum bus_match_node_type bus_match_node_type_from_string(const char *k, size_t n
         return -EINVAL;
 }
 
-struct match_component {
-        enum bus_match_node_type type;
-        uint8_t value_u8;
-        char *value_str;
-};
-
 static int match_component_compare(const void *a, const void *b) {
-        const struct match_component *x = a, *y = b;
+        const struct bus_match_component *x = a, *y = b;
 
         if (x->type < y->type)
                 return -1;
@@ -665,7 +662,7 @@ static int match_component_compare(const void *a, const void *b) {
         return 0;
 }
 
-static void free_components(struct match_component *components, unsigned n_components) {
+void bus_match_parse_free(struct bus_match_component *components, unsigned n_components) {
         unsigned i;
 
         for (i = 0; i < n_components; i++)
@@ -674,13 +671,13 @@ static void free_components(struct match_component *components, unsigned n_compo
         free(components);
 }
 
-static int parse_match(
+int bus_match_parse(
                 const char *match,
-                struct match_component **_components,
+                struct bus_match_component **_components,
                 unsigned *_n_components) {
 
         const char *p = match;
-        struct match_component *components = NULL;
+        struct bus_match_component *components = NULL;
         size_t components_allocated = 0;
         unsigned n_components = 0, i;
         _cleanup_free_ char *value = NULL;
@@ -771,7 +768,7 @@ static int parse_match(
         }
 
         /* Order the whole thing, so that we always generate the same tree */
-        qsort(components, n_components, sizeof(struct match_component), match_component_compare);
+        qsort(components, n_components, sizeof(struct bus_match_component), match_component_compare);
 
         /* Check for duplicates */
         for (i = 0; i+1 < n_components; i++)
@@ -786,29 +783,24 @@ static int parse_match(
         return 0;
 
 fail:
-        free_components(components, n_components);
+        bus_match_parse_free(components, n_components);
         return r;
 }
 
 int bus_match_add(
                 struct bus_match_node *root,
-                const char *match,
+                struct bus_match_component *components,
+                unsigned n_components,
                 sd_bus_message_handler_t callback,
                 void *userdata,
+                uint64_t cookie,
                 struct bus_match_node **ret) {
 
-        struct match_component *components = NULL;
-        unsigned n_components = 0, i;
+        unsigned i;
         struct bus_match_node *n;
         int r;
 
         assert(root);
-        assert(match);
-        assert(callback);
-
-        r = parse_match(match, &components, &n_components);
-        if (r < 0)
-                return r;
 
         n = root;
         for (i = 0; i < n_components; i++) {
@@ -816,38 +808,32 @@ int bus_match_add(
                                 n, components[i].type,
                                 components[i].value_u8, components[i].value_str, &n);
                 if (r < 0)
-                        goto finish;
+                        return r;
         }
 
-        r = bus_match_add_leaf(n, callback, userdata, &n);
+        r = bus_match_add_leaf(n, callback, userdata, cookie, &n);
         if (r < 0)
-                goto finish;
+                return r;
 
         if (ret)
                 *ret = n;
 
-finish:
-        free_components(components, n_components);
-        return r;
+        return 0;
 }
 
 int bus_match_remove(
                 struct bus_match_node *root,
-                const char *match,
+                struct bus_match_component *components,
+                unsigned n_components,
                 sd_bus_message_handler_t callback,
-                void *userdata) {
+                void *userdata,
+                uint64_t *cookie) {
 
-        struct match_component *components = NULL;
-        unsigned n_components = 0, i;
+        unsigned i;
         struct bus_match_node *n, **gc;
         int r;
 
         assert(root);
-        assert(match);
-
-        r = parse_match(match, &components, &n_components);
-        if (r < 0)
-                return r;
 
         gc = newa(struct bus_match_node*, n_components);
 
@@ -858,14 +844,17 @@ int bus_match_remove(
                                 components[i].value_u8, components[i].value_str,
                                 &n);
                 if (r <= 0)
-                        goto finish;
+                        return r;
 
                 gc[i] = n;
         }
 
         r = bus_match_find_leaf(n, callback, userdata, &n);
         if (r <= 0)
-                goto finish;
+                return r;
+
+        if (cookie)
+                *cookie = n->leaf.cookie;
 
         /* Free the leaf */
         bus_match_node_free(n);
@@ -881,8 +870,6 @@ int bus_match_remove(
                         break;
         }
 
-finish:
-        free_components(components, n_components);
         return r;
 }
 
diff --git a/src/libsystemd-bus/bus-match.h b/src/libsystemd-bus/bus-match.h
index 4d46cf9aff..d24aeec43d 100644
--- a/src/libsystemd-bus/bus-match.h
+++ b/src/libsystemd-bus/bus-match.h
@@ -61,6 +61,7 @@ struct bus_match_node {
                         sd_bus_message_handler_t callback;
                         void *userdata;
                         unsigned last_iteration;
+                        uint64_t cookie;
                 } leaf;
                 struct {
                         /* If this is set, then the child is NULL */
@@ -69,10 +70,16 @@ struct bus_match_node {
         };
 };
 
+struct bus_match_component {
+        enum bus_match_node_type type;
+        uint8_t value_u8;
+        char *value_str;
+};
+
 int bus_match_run(sd_bus *bus, struct bus_match_node *root, sd_bus_message *m);
 
-int bus_match_add(struct bus_match_node *root, const char *match, sd_bus_message_handler_t callback, void *userdata, struct bus_match_node **ret);
-int bus_match_remove(struct bus_match_node *root, const char *match, sd_bus_message_handler_t callback, void *userdata);
+int bus_match_add(struct bus_match_node *root, struct bus_match_component *components, unsigned n_components, sd_bus_message_handler_t callback, void *userdata, uint64_t cookie, struct bus_match_node **ret);
+int bus_match_remove(struct bus_match_node *root, struct bus_match_component *components, unsigned n_components, sd_bus_message_handler_t callback, void *userdata, uint64_t *cookie);
 
 void bus_match_free(struct bus_match_node *node);
 
@@ -80,3 +87,6 @@ void bus_match_dump(struct bus_match_node *node, unsigned level);
 
 const char* bus_match_node_type_to_string(enum bus_match_node_type t, char buf[], size_t l);
 enum bus_match_node_type bus_match_node_type_from_string(const char *k, size_t n);
+
+int bus_match_parse(const char *match, struct bus_match_component **_components, unsigned *_n_components);
+void bus_match_parse_free(struct bus_match_component *components, unsigned n_components);
diff --git a/src/libsystemd-bus/sd-bus.c b/src/libsystemd-bus/sd-bus.c
index 6033aa744f..7ae32036bd 100644
--- a/src/libsystemd-bus/sd-bus.c
+++ b/src/libsystemd-bus/sd-bus.c
@@ -2404,6 +2404,9 @@ int sd_bus_remove_fallback(sd_bus *bus, const char *prefix, sd_bus_message_handl
 }
 
 int sd_bus_add_match(sd_bus *bus, const char *match, sd_bus_message_handler_t callback, void *userdata) {
+        struct bus_match_component *components = NULL;
+        unsigned n_components = 0;
+        uint64_t cookie = 0;
         int r = 0;
 
         if (!bus)
@@ -2413,27 +2416,35 @@ int sd_bus_add_match(sd_bus *bus, const char *match, sd_bus_message_handler_t ca
         if (bus_pid_changed(bus))
                 return -ECHILD;
 
+        r = bus_match_parse(match, &components, &n_components);
+        if (r < 0)
+                goto finish;
+
         if (bus->bus_client) {
-                r = bus_add_match_internal(bus, match);
+                cookie = ++bus->match_cookie;
+
+                r = bus_add_match_internal(bus, match, components, n_components, cookie);
                 if (r < 0)
-                        return r;
+                        goto finish;
         }
 
-        if (callback) {
-                bus->match_callbacks_modified = true;
-                r = bus_match_add(&bus->match_callbacks, match, callback, userdata, NULL);
-                if (r < 0) {
-
-                        if (bus->bus_client)
-                                bus_remove_match_internal(bus, match);
-                }
+        bus->match_callbacks_modified = true;
+        r = bus_match_add(&bus->match_callbacks, components, n_components, callback, userdata, cookie, NULL);
+        if (r < 0) {
+                if (bus->bus_client)
+                        bus_remove_match_internal(bus, match, cookie);
         }
 
+finish:
+        bus_match_parse_free(components, n_components);
         return r;
 }
 
 int sd_bus_remove_match(sd_bus *bus, const char *match, sd_bus_message_handler_t callback, void *userdata) {
+        struct bus_match_component *components = NULL;
+        unsigned n_components = 0;
         int r = 0, q = 0;
+        uint64_t cookie = 0;
 
         if (!bus)
                 return -EINVAL;
@@ -2442,17 +2453,19 @@ int sd_bus_remove_match(sd_bus *bus, const char *match, sd_bus_message_handler_t
         if (bus_pid_changed(bus))
                 return -ECHILD;
 
+        r = bus_match_parse(match, &components, &n_components);
+        if (r < 0)
+                return r;
+
+        bus->match_callbacks_modified = true;
+        r = bus_match_remove(&bus->match_callbacks, components, n_components, callback, userdata, &cookie);
+
         if (bus->bus_client)
-                r = bus_remove_match_internal(bus, match);
+                q = bus_remove_match_internal(bus, match, cookie);
 
-        if (callback) {
-                bus->match_callbacks_modified = true;
-                q = bus_match_remove(&bus->match_callbacks, match, callback, userdata);
-        }
+        bus_match_parse_free(components, n_components);
 
-        if (r < 0)
-                return r;
-        return q;
+        return r < 0 ? r : q;
 }
 
 int sd_bus_emit_signal(
diff --git a/src/libsystemd-bus/test-bus-kernel.c b/src/libsystemd-bus/test-bus-kernel.c
index b8e89e41bc..0a2457a6dc 100644
--- a/src/libsystemd-bus/test-bus-kernel.c
+++ b/src/libsystemd-bus/test-bus-kernel.c
@@ -92,19 +92,8 @@ int main(int argc, char *argv[]) {
 
         printf("unique b: %s\n", ub);
 
-        {
-                //FIXME:
-                struct kdbus_cmd_match cmd_match;
-
-                cmd_match.size = sizeof(cmd_match);
-                cmd_match.src_id = KDBUS_MATCH_SRC_ID_ANY;
-
-                r = ioctl(sd_bus_get_fd(a), KDBUS_CMD_MATCH_ADD, &cmd_match);
-                assert_se(r >= 0);
-
-                r = ioctl(sd_bus_get_fd(b), KDBUS_CMD_MATCH_ADD, &cmd_match);
-                assert_se(r >= 0);
-        }
+        /* interface='waldo.com',member='Piep' */
+        assert_se(sd_bus_add_match(b, "interface='waldo.com'", NULL, NULL) >= 0);
 
         r = sd_bus_emit_signal(a, "/foo/bar/waldo", "waldo.com", "Piep", "sss", "I am a string", "/this/is/a/path", "and.this.a.domain.name");
         assert_se(r >= 0);
diff --git a/src/libsystemd-bus/test-bus-match.c b/src/libsystemd-bus/test-bus-match.c
index 605d86a85c..db977f726e 100644
--- a/src/libsystemd-bus/test-bus-match.c
+++ b/src/libsystemd-bus/test-bus-match.c
@@ -55,6 +55,36 @@ static bool mask_contains(unsigned a[], unsigned n) {
         return true;
 }
 
+static int match_add(struct bus_match_node *root, const char *match, int value) {
+        struct bus_match_component *components = NULL;
+        unsigned n_components = 0;
+        int r;
+
+        r = bus_match_parse(match, &components, &n_components);
+        if (r < 0)
+                return r;
+
+        r = bus_match_add(root, components, n_components, filter, INT_TO_PTR(value), 0, NULL);
+        bus_match_parse_free(components, n_components);
+
+        return r;
+}
+
+static int match_remove(struct bus_match_node *root, const char *match, int value) {
+        struct bus_match_component *components = NULL;
+        unsigned n_components = 0;
+        int r;
+
+        r = bus_match_parse(match, &components, &n_components);
+        if (r < 0)
+                return r;
+
+        r = bus_match_remove(root, components, n_components, filter, INT_TO_PTR(value), 0);
+        bus_match_parse_free(components, n_components);
+
+        return r;
+}
+
 int main(int argc, char *argv[]) {
         struct bus_match_node root;
         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
@@ -63,20 +93,20 @@ int main(int argc, char *argv[]) {
         zero(root);
         root.type = BUS_MATCH_ROOT;
 
-        assert_se(bus_match_add(&root, "arg2='wal\\'do',sender='foo',type='signal',interface='bar',", filter, INT_TO_PTR(1), NULL) >= 0);
-        assert_se(bus_match_add(&root, "arg2='wal\\'do2',sender='foo',type='signal',interface='bar',", filter, INT_TO_PTR(2), NULL) >= 0);
-        assert_se(bus_match_add(&root, "arg3='test',sender='foo',type='signal',interface='bar',", filter, INT_TO_PTR(3), NULL) >= 0);
-        assert_se(bus_match_add(&root, "arg3='test',sender='foo',type='method_call',interface='bar',", filter, INT_TO_PTR(4), NULL) >= 0);
-        assert_se(bus_match_add(&root, "", filter, INT_TO_PTR(5), NULL) >= 0);
-        assert_se(bus_match_add(&root, "interface='quux'", filter, INT_TO_PTR(6), NULL) >= 0);
-        assert_se(bus_match_add(&root, "interface='bar'", filter, INT_TO_PTR(7), NULL) >= 0);
-        assert_se(bus_match_add(&root, "member='waldo',path='/foo/bar'", filter, INT_TO_PTR(8), NULL) >= 0);
-        assert_se(bus_match_add(&root, "path='/foo/bar'", filter, INT_TO_PTR(9), NULL) >= 0);
-        assert_se(bus_match_add(&root, "path_namespace='/foo'", filter, INT_TO_PTR(10), NULL) >= 0);
-        assert_se(bus_match_add(&root, "path_namespace='/foo/quux'", filter, INT_TO_PTR(11), NULL) >= 0);
-        assert_se(bus_match_add(&root, "arg1='two'", filter, INT_TO_PTR(12), NULL) >= 0);
-        assert_se(bus_match_add(&root, "member='waldo',arg2path='/prefix/'", filter, INT_TO_PTR(13), NULL) >= 0);
-        assert_se(bus_match_add(&root, "member='waldo',path='/foo/bar',arg3namespace='prefix'", filter, INT_TO_PTR(14), NULL) >= 0);
+        assert_se(match_add(&root, "arg2='wal\\'do',sender='foo',type='signal',interface='bar',", 1) >= 0);
+        assert_se(match_add(&root, "arg2='wal\\'do2',sender='foo',type='signal',interface='bar',", 2) >= 0);
+        assert_se(match_add(&root, "arg3='test',sender='foo',type='signal',interface='bar',", 3) >= 0);
+        assert_se(match_add(&root, "arg3='test',sender='foo',type='method_call',interface='bar',", 4) >= 0);
+        assert_se(match_add(&root, "", 5) >= 0);
+        assert_se(match_add(&root, "interface='quux'", 6) >= 0);
+        assert_se(match_add(&root, "interface='bar'", 7) >= 0);
+        assert_se(match_add(&root, "member='waldo',path='/foo/bar'", 8) >= 0);
+        assert_se(match_add(&root, "path='/foo/bar'", 9) >= 0);
+        assert_se(match_add(&root, "path_namespace='/foo'", 10) >= 0);
+        assert_se(match_add(&root, "path_namespace='/foo/quux'", 11) >= 0);
+        assert_se(match_add(&root, "arg1='two'", 12) >= 0);
+        assert_se(match_add(&root, "member='waldo',arg2path='/prefix/'", 13) >= 0);
+        assert_se(match_add(&root, "member='waldo',path='/foo/bar',arg3namespace='prefix'", 14) >= 0);
 
         bus_match_dump(&root, 0);
 
@@ -88,9 +118,9 @@ int main(int argc, char *argv[]) {
         assert_se(bus_match_run(NULL, &root, m) == 0);
         assert_se(mask_contains((unsigned[]) { 9, 8, 7, 5, 10, 12, 13, 14 }, 8));
 
-        assert_se(bus_match_remove(&root, "member='waldo',path='/foo/bar'", filter, INT_TO_PTR(8)) > 0);
-        assert_se(bus_match_remove(&root, "arg2path='/prefix/',member='waldo'", filter, INT_TO_PTR(13)) > 0);
-        assert_se(bus_match_remove(&root, "interface='barxx'", filter, INT_TO_PTR(7)) == 0);
+        assert_se(match_remove(&root, "member='waldo',path='/foo/bar'", 8) > 0);
+        assert_se(match_remove(&root, "arg2path='/prefix/',member='waldo'", 13) > 0);
+        assert_se(match_remove(&root, "interface='barxx'", 7) == 0);
 
         bus_match_dump(&root, 0);