bus: add basic implementation of a native bus client library

1 files changed, 322 insertions, 0 deletions

diff --git a/src/libsystemd-bus/bus-control.c b/src/libsystemd-bus/bus-control.c
new file mode 100644
index 0000000000..e4cc251a4b
--- /dev/null
+++ b/src/libsystemd-bus/bus-control.c
@@ -0,0 +1,322 @@
+/*-*- 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 <stddef.h>
+#include <errno.h>
+
+#include "strv.h"
+
+#include "sd-bus.h"
+#include "bus-internal.h"
+#include "bus-message.h"
+
+const char *sd_bus_get_unique_name(sd_bus *bus) {
+        if (!bus)
+                return NULL;
+
+        return bus->unique_name;
+}
+
+int sd_bus_request_name(sd_bus *bus, const char *name, int flags) {
+        _cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL;
+        uint32_t ret;
+        int r;
+
+        if (!bus)
+                return -EINVAL;
+        if (!name)
+                return -EINVAL;
+
+        r = sd_bus_message_new_method_call(
+                        bus,
+                        "org.freedesktop.DBus",
+                        "/",
+                        "org.freedesktop.DBus",
+                        "RequestName",
+                        &m);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_append(m, "su", name, flags);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_send_with_reply_and_block(bus, m, (uint64_t) -1, NULL, &reply);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_read(reply, "u", &ret);
+        if (r < 0)
+                return r;
+
+        return ret;
+}
+
+int sd_bus_release_name(sd_bus *bus, const char *name) {
+        _cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL;
+        uint32_t ret;
+        int r;
+
+        if (!bus)
+                return -EINVAL;
+        if (!name)
+                return -EINVAL;
+
+        r = sd_bus_message_new_method_call(
+                        bus,
+                        "org.freedesktop.DBus",
+                        "/",
+                        "org.freedesktop.DBus",
+                        "ReleaseName",
+                        &m);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_append(m, "s", name);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_send_with_reply_and_block(bus, m, (uint64_t) -1, NULL, &reply);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_read(reply, "u", &ret);
+        if (r < 0)
+                return r;
+
+        return ret;
+}
+
+int sd_bus_list_names(sd_bus *bus, char ***l) {
+        _cleanup_bus_message_unref_ sd_bus_message *m1 = NULL, *reply1 = NULL, *m2 = NULL, *reply2 = NULL;
+        _cleanup_strv_free_ char **a = NULL, **b = NULL;
+        char **x = NULL;
+        int r;
+
+        if (!bus)
+                return -EINVAL;
+        if (!l)
+                return -EINVAL;
+
+        r = sd_bus_message_new_method_call(
+                        bus,
+                        "org.freedesktop.DBus",
+                        "/",
+                        "org.freedesktop.DBus",
+                        "ListNames",
+                        &m1);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_new_method_call(
+                        bus,
+                        "org.freedesktop.DBus",
+                        "/",
+                        "org.freedesktop.DBus",
+                        "ListActivatableNames",
+                        &m2);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_send_with_reply_and_block(bus, m1, (uint64_t) -1, NULL, &reply1);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_send_with_reply_and_block(bus, m2, (uint64_t) -1, NULL, &reply2);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_read(reply1, "as", &a);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_read(reply2, "as", &b);
+        if (r < 0)
+                return r;
+
+        x = strv_merge(a, b);
+        if (!x)
+                return -ENOMEM;
+
+        *l = strv_uniq(x);
+        return 0;
+}
+
+int sd_bus_get_owner(sd_bus *bus, const char *name, char **owner) {
+        _cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL;
+        int r;
+
+        if (!bus)
+                return -EINVAL;
+        if (!name)
+                return -EINVAL;
+
+        r = sd_bus_message_new_method_call(
+                        bus,
+                        "org.freedesktop.DBus",
+                        "/",
+                        "org.freedesktop.DBus",
+                        "GetNameOwner",
+                        &m);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_append(m, "s", name);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_send_with_reply_and_block(bus, m, (uint64_t) -1, NULL, &reply);
+        if (r < 0)
+                return r;
+
+        return sd_bus_message_read(reply, "s", owner);
+}
+
+int sd_bus_get_owner_uid(sd_bus *bus, const char *name, uid_t *uid) {
+        _cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL;
+        uint32_t u;
+        int r;
+
+        if (!bus)
+                return -EINVAL;
+        if (!name)
+                return -EINVAL;
+        if (!uid)
+                return -EINVAL;
+
+        r = sd_bus_message_new_method_call(
+                        bus,
+                        "org.freedesktop.DBus",
+                        "/",
+                        "org.freedesktop.DBus",
+                        "GetConnectionUnixUser",
+                        &m);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_append(m, "s", name);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_send_with_reply_and_block(bus, m, (uint64_t) -1, NULL, &reply);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_read(reply, "u", &u);
+        if (r < 0)
+                return r;
+
+        *uid = (uid_t) u;
+        return 0;
+}
+
+int sd_bus_get_owner_pid(sd_bus *bus, const char *name, pid_t *pid) {
+        _cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL;
+        uint32_t u;
+        int r;
+
+        if (!bus)
+                return -EINVAL;
+        if (!name)
+                return -EINVAL;
+        if (!pid)
+                return -EINVAL;
+
+        r = sd_bus_message_new_method_call(
+                        bus,
+                        "org.freedesktop.DBus",
+                        "/",
+                        "org.freedesktop.DBus",
+                        "GetConnectionUnixUser",
+                        &m);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_append(m, "s", name);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_send_with_reply_and_block(bus, m, (uint64_t) -1, NULL, &reply);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_read(reply, "u", &u);
+        if (r < 0)
+                return r;
+
+        if (u == 0)
+                return -EIO;
+
+        *pid = (uid_t) u;
+        return 0;
+}
+
+int sd_bus_add_match(sd_bus *bus, const char *match) {
+        _cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL;
+        int r;
+
+        if (!bus)
+                return -EINVAL;
+        if (!match)
+                return -EINVAL;
+
+        r = sd_bus_message_new_method_call(
+                        bus,
+                        "org.freedesktop.DBus",
+                        "/",
+                        "org.freedesktop.DBus",
+                        "AddMatch",
+                        &m);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_append(m, "s", match);
+        if (r < 0)
+                return r;
+
+        return sd_bus_send_with_reply_and_block(bus, m, (uint64_t) -1, NULL, &reply);
+}
+
+int sd_bus_remove_match(sd_bus *bus, const char *match) {
+        _cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL;
+        int r;
+
+        if (!bus)
+                return -EINVAL;
+        if (!match)
+                return -EINVAL;
+
+        r = sd_bus_message_new_method_call(
+                        bus,
+                        "org.freedesktop.DBus",
+                        "/",
+                        "org.freedesktop.DBus",
+                        "RemoveMatch",
+                        &m);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_append(m, "s", match);
+        if (r < 0)
+                return r;
+
+        return sd_bus_send_with_reply_and_block(bus, m, (uint64_t) -1, NULL, &reply);
+}