networkd: add a basic network daemon

This daemon listens for and configures network devices tagged with
'systemd-networkd'. By default, no devices are tagged so this daemon
can safely run in parallel with existing network daemons/scripts.

Networks are configured in /etc/systemd/network/*.network. The first .network
file that matches a given link is applied. The matching logic is similar to
the one for .link files, but additionally supports matching on interface name.

The mid-term aim is to provide an alternative to ad-hoc scripts currently used
in initrd's and for wired setups that don't change much (e.g., as seen on
servers/and some embedded systems).

Currently, static addresses and a gateway can be configured.

Example .network file:

[Match]
Name=wlp2s0

[Network]
Description=My Network
Gateway=192.168.1.1
Address=192.168.1.23/24
Address=fe80::9aee:94ff:fe3f:c618/64

1 files changed, 58 insertions, 0 deletions

diff --git a/src/network/networkd.c b/src/network/networkd.c
new file mode 100644
index 0000000000..ed93ffb3fc
--- /dev/null
+++ b/src/network/networkd.c
@@ -0,0 +1,58 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2013 Tom Gundersen <teg@jklm.no>
+
+  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 "sd-event.h"
+
+#include "networkd.h"
+
+int main(int argc, char *argv[]) {
+        _cleanup_manager_free_ Manager *m;
+        int r;
+
+        log_set_target(LOG_TARGET_AUTO);
+        log_parse_environment();
+        log_open();
+
+        umask(0022);
+
+        if (argc != 1) {
+                log_error("This program takes no arguments.");
+                return EXIT_FAILURE;
+        }
+
+        r = manager_new(&m);
+        if (r < 0)
+                return EXIT_FAILURE;
+
+        r = manager_udev_listen(m);
+        if (r < 0)
+                return EXIT_FAILURE;
+
+        r = manager_udev_enumerate_links(m);
+        if (r < 0)
+                return EXIT_FAILURE;
+
+        r = sd_event_loop(m->event);
+        if (r < 0)
+                return EXIT_FAILURE;
+
+        return  EXIT_SUCCESS;
+}