bus: parse matches locally and allow registration of callbacks for them

This includes code to parse and split up match strings which will also
be useful to calculate bloom filter masks when the time comes.

1 files changed, 114 insertions, 0 deletions

diff --git a/src/libsystemd-bus/test-bus-match.c b/src/libsystemd-bus/test-bus-match.c
new file mode 100644
index 0000000000..ccbea815e7
--- /dev/null
+++ b/src/libsystemd-bus/test-bus-match.c
@@ -0,0 +1,114 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2013 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <assert.h>
+
+#include "log.h"
+#include "util.h"
+#include "macro.h"
+
+#include "bus-match.h"
+#include "bus-message.h"
+
+static bool mask[32];
+
+static int filter(sd_bus *b, int ret, sd_bus_message *m, void *userdata) {
+        log_info("Ran %i", PTR_TO_INT(userdata));
+        mask[PTR_TO_INT(userdata)] = true;
+        return 0;
+}
+
+static bool mask_contains(unsigned a[], unsigned n) {
+        unsigned i, j;
+
+        for (i = 0; i < ELEMENTSOF(mask); i++) {
+                bool found = false;
+
+                for (j = 0; j < n; j++)
+                        if (a[j] == i) {
+                                found = true;
+                                break;
+                        }
+
+                if (found != mask[i])
+                        return false;
+        }
+
+        return true;
+}
+
+int main(int argc, char *argv[]) {
+        struct bus_match_node root;
+        _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+        enum bus_match_node_type i;
+
+        zero(root);
+        root.type = BUS_MATCH_ROOT;
+
+        assert_se(bus_match_add(&root, "arg3='wal\\'do',sender='foo',type='signal',interface='bar',", filter, INT_TO_PTR(1), NULL) >= 0);
+        assert_se(bus_match_add(&root, "arg3='wal\\'do2',sender='foo',type='signal',interface='bar',", filter, INT_TO_PTR(2), NULL) >= 0);
+        assert_se(bus_match_add(&root, "arg4='test',sender='foo',type='signal',interface='bar',", filter, INT_TO_PTR(3), NULL) >= 0);
+        assert_se(bus_match_add(&root, "arg4='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, "arg2='two'", filter, INT_TO_PTR(12), NULL) >= 0);
+        assert_se(bus_match_add(&root, "member='waldo',arg3path='/prefix/'", filter, INT_TO_PTR(13), NULL) >= 0);
+        assert_se(bus_match_add(&root, "member='waldo',path='/foo/bar',arg4namespace='prefix'", filter, INT_TO_PTR(14), NULL) >= 0);
+
+        bus_match_dump(&root, 0);
+
+        assert_se(sd_bus_message_new_signal(NULL, "/foo/bar", "bar", "waldo", &m) >= 0);
+        assert_se(sd_bus_message_append(m, "ssss", "one", "two", "/prefix/three", "prefix.four") >= 0);
+        assert_se(bus_message_seal(m, 1) >= 0);
+
+        zero(mask);
+        assert_se(bus_match_run(NULL, &root, 0, 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, "arg3path='/prefix/',member='waldo'", filter, INT_TO_PTR(13)) > 0);
+        assert_se(bus_match_remove(&root, "interface='barxx'", filter, INT_TO_PTR(7)) == 0);
+
+        bus_match_dump(&root, 0);
+
+        zero(mask);
+        assert_se(bus_match_run(NULL, &root, 0, m) == 0);
+        assert_se(mask_contains((unsigned[]) { 9, 5, 10, 12, 14, 7 }, 6));
+
+        for (i = 0; i < _BUS_MATCH_NODE_TYPE_MAX; i++) {
+                char buf[32];
+                const char *x;
+
+                assert_se(x = bus_match_node_type_to_string(i, buf, sizeof(buf)));
+
+                if (i >= BUS_MATCH_MESSAGE_TYPE)
+                        assert_se(bus_match_node_type_from_string(x, strlen(x)) == i);
+        }
+
+        bus_match_free(&root);
+
+        return 0;
+}