networkd: add basic dbus API

Only the very basics, more to come.

For now:

$ busctl tree org.freedesktop.network1
└─/org/freedesktop/network1
  └─/org/freedesktop/network1/link
    ├─/org/freedesktop/network1/link/1
    ├─/org/freedesktop/network1/link/2
    ├─/org/freedesktop/network1/link/3
    ├─/org/freedesktop/network1/link/4
    ├─/org/freedesktop/network1/link/5
    ├─/org/freedesktop/network1/link/6
    ├─/org/freedesktop/network1/link/7
    ├─/org/freedesktop/network1/link/8
    └─/org/freedesktop/network1/link/9

$ busctl introspect org.freedesktop.network1 /org/freedesktop/network1
NAME                                TYPE      SIGNATURE RESULT/VALUE FLAGS
org.freedesktop.network1.Manager    interface -         -            -
.OperationalState                   property  s         "carrier" emits-change

$ busctl introspect org.freedesktop.network1 /org/freedesktop/network1/link/1
NAME                                TYPE      SIGNATURE RESULT/VALUE FLAGS
org.freedesktop.network1.Link       interface -         -            -
.AdministrativeState                property  s         "unmanaged" emits-change
.OperationalState                   property  s         "carrier" emits-change

10 files changed, 334 insertions, 32 deletions

diff --git a/Makefile.am b/Makefile.am
index 14f682755a..53ad568d70 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -5585,6 +5585,7 @@ libsystemd_networkd_core_la_SOURCES = \
 	src/network/networkd-netdev-bond.c \
 	src/network/networkd-netdev-bridge.c \
 	src/network/networkd-link.c \
+	src/network/networkd-link-bus.c \
 	src/network/networkd-ipv4ll.c \
 	src/network/networkd-dhcp4.c \
 	src/network/networkd-dhcp6.c \
@@ -5592,6 +5593,7 @@ libsystemd_networkd_core_la_SOURCES = \
 	src/network/networkd-address.c \
 	src/network/networkd-route.c \
 	src/network/networkd-manager.c \
+	src/network/networkd-manager-bus.c \
 	src/network/networkd-fdb.c \
 	src/network/networkd-address-pool.c
 
@@ -5673,6 +5675,15 @@ nodist_systemunit_DATA += \
 	units/systemd-networkd.service \
 	units/systemd-networkd-wait-online.service
 
+dist_systemunit_DATA_busnames += \
+	units/org.freedesktop.network1.busname
+
+dist_dbussystemservice_DATA += \
+	src/network/org.freedesktop.network1.service
+
+dist_dbuspolicy_DATA += \
+	src/network/org.freedesktop.network1.conf
+
 GENERAL_ALIASES += \
 	$(systemunitdir)/systemd-networkd.socket $(pkgsysconfdir)/system/sockets.target.wants/systemd-networkd.socket \
 	$(systemunitdir)/systemd-networkd.service $(pkgsysconfdir)/system/multi-user.target.wants/systemd-networkd.service \
diff --git a/src/network/networkd-link-bus.c b/src/network/networkd-link-bus.c
new file mode 100644
index 0000000000..645c47ae8c
--- /dev/null
+++ b/src/network/networkd-link-bus.c
@@ -0,0 +1,122 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2015 Tom Gundersen
+
+  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 "bus-util.h"
+#include "strv.h"
+
+#include "networkd.h"
+#include "networkd-link.h"
+
+static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_operational_state, link_operstate, LinkOperationalState);
+static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_administrative_state, link_state, LinkState);
+
+const sd_bus_vtable link_vtable[] = {
+        SD_BUS_VTABLE_START(0),
+
+        SD_BUS_PROPERTY("OperationalState", "s", property_get_operational_state, offsetof(Link, operstate), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
+        SD_BUS_PROPERTY("AdministrativeState", "s", property_get_administrative_state, offsetof(Link, state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
+
+        SD_BUS_VTABLE_END
+};
+
+static char *link_bus_path(Link *link) {
+        char *p;
+
+        assert(link);
+        assert(link->ifindex > 0);
+
+        asprintf(&p, "/org/freedesktop/network1/link/%d", link->ifindex);
+
+        return p;
+}
+
+int link_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
+        _cleanup_strv_free_ char **l = NULL;
+        Manager *m = userdata;
+        Link *link;
+        Iterator i;
+        int r;
+
+        assert(bus);
+        assert(path);
+        assert(m);
+        assert(nodes);
+
+        HASHMAP_FOREACH(link, m->links, i) {
+                char *p;
+
+                p = link_bus_path(link);
+                if (!p)
+                        return -ENOMEM;
+
+                r = strv_consume(&l, p);
+                if (r < 0)
+                        return r;
+        }
+
+        *nodes = l;
+        l = NULL;
+
+        return 1;
+}
+
+int link_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
+        Manager *m = userdata;
+        Link *link;
+        int ifindex, r;
+
+        assert(bus);
+        assert(path);
+        assert(interface);
+        assert(m);
+        assert(found);
+
+        if (sscanf(path, "/org/freedesktop/network1/link/%d", &ifindex) != 1)
+                return 0;
+
+        r = link_get(m, ifindex, &link);
+        if (r < 0)
+                return 0;
+
+        *found = link;
+
+        return 1;
+}
+
+int link_send_changed(Link *link, const char *property, ...) {
+        _cleanup_free_ char *p = NULL;
+        char **l;
+
+        assert(link);
+        assert(link->manager);
+
+        l = strv_from_stdarg_alloca(property);
+
+        p = link_bus_path(link);
+        if (!p)
+                return -ENOMEM;
+
+        return sd_bus_emit_properties_changed_strv(
+                        link->manager->bus,
+                        p,
+                        "org.freedesktop.network1.Link",
+                        l);
+}
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 077626cd17..f4ab97fb17 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -338,11 +338,24 @@ int link_get(Manager *m, int ifindex, Link **ret) {
         return 0;
 }
 
+static void link_set_state(Link *link, LinkState state) {
+        assert(link);
+
+        if (link->state == state)
+                return;
+
+        link->state = state;
+
+        link_send_changed(link, "AdministrativeState", NULL);
+
+        return;
+}
+
 void link_drop(Link *link) {
         if (!link || link->state == LINK_STATE_LINGER)
                 return;
 
-        link->state = LINK_STATE_LINGER;
+        link_set_state(link, LINK_STATE_LINGER);
 
         log_link_debug(link, "link removed");
 
@@ -356,7 +369,7 @@ static void link_enter_unmanaged(Link *link) {
 
         log_link_debug(link, "unmanaged");
 
-        link->state = LINK_STATE_UNMANAGED;
+        link_set_state(link, LINK_STATE_UNMANAGED);
 
         link_save(link);
 }
@@ -430,7 +443,7 @@ void link_enter_failed(Link *link) {
 
         log_link_warning(link, "failed");
 
-        link->state = LINK_STATE_FAILED;
+        link_set_state(link, LINK_STATE_FAILED);
 
         link_stop_clients(link);
 
@@ -473,7 +486,7 @@ static int link_enter_configured(Link *link) {
 
         log_link_info(link, "link configured");
 
-        link->state = LINK_STATE_CONFIGURED;
+        link_set_state(link, LINK_STATE_CONFIGURED);
 
         link_save(link);
 
@@ -536,7 +549,7 @@ static int link_enter_set_routes(Link *link) {
         assert(link->network);
         assert(link->state == LINK_STATE_SETTING_ADDRESSES);
 
-        link->state = LINK_STATE_SETTING_ROUTES;
+        link_set_state(link, LINK_STATE_SETTING_ROUTES);
 
         LIST_FOREACH(routes, rt, link->network->static_routes) {
                 r = route_configure(rt, link, &route_handler);
@@ -617,7 +630,7 @@ static int link_enter_set_addresses(Link *link) {
         assert(link->network);
         assert(link->state != _LINK_STATE_INVALID);
 
-        link->state = LINK_STATE_SETTING_ADDRESSES;
+        link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
 
         LIST_FOREACH(addresses, ad, link->network->static_addresses) {
                 r = address_configure(ad, link, &address_handler);
@@ -1153,7 +1166,7 @@ static int link_enter_join_netdev(Link *link) {
         assert(link->network);
         assert(link->state == LINK_STATE_PENDING);
 
-        link->state = LINK_STATE_ENSLAVING;
+        link_set_state(link, LINK_STATE_ENSLAVING);
 
         link_save(link);
 
@@ -1724,7 +1737,7 @@ int link_update(Link *link, sd_rtnl_message *m) {
         if (link->state == LINK_STATE_LINGER) {
                 link_ref(link);
                 log_link_info(link, "link readded");
-                link->state = LINK_STATE_ENSLAVING;
+                link_set_state(link, LINK_STATE_ENSLAVING);
         }
 
         r = sd_rtnl_message_read_string(m, IFLA_IFNAME, &ifname);
@@ -1843,11 +1856,11 @@ int link_update(Link *link, sd_rtnl_message *m) {
 }
 
 static void link_update_operstate(Link *link) {
-
+        LinkOperationalState operstate;
         assert(link);
 
         if (link->kernel_operstate == IF_OPER_DORMANT)
-                link->operstate = LINK_OPERSTATE_DORMANT;
+                operstate = LINK_OPERSTATE_DORMANT;
         else if (link_has_carrier(link)) {
                 Address *address;
                 uint8_t scope = RT_SCOPE_NOWHERE;
@@ -1863,17 +1876,22 @@ static void link_update_operstate(Link *link) {
 
                 if (scope < RT_SCOPE_SITE)
                         /* universally accessible addresses found */
-                        link->operstate = LINK_OPERSTATE_ROUTABLE;
+                        operstate = LINK_OPERSTATE_ROUTABLE;
                 else if (scope < RT_SCOPE_HOST)
                         /* only link or site local addresses found */
-                        link->operstate = LINK_OPERSTATE_DEGRADED;
+                        operstate = LINK_OPERSTATE_DEGRADED;
                 else
                         /* no useful addresses found */
-                        link->operstate = LINK_OPERSTATE_CARRIER;
+                        operstate = LINK_OPERSTATE_CARRIER;
         } else if (link->flags & IFF_UP)
-                link->operstate = LINK_OPERSTATE_NO_CARRIER;
+                operstate = LINK_OPERSTATE_NO_CARRIER;
         else
-                link->operstate = LINK_OPERSTATE_OFF;
+                operstate = LINK_OPERSTATE_OFF;
+
+        if (link->operstate != operstate) {
+                link->operstate = operstate;
+                link_send_changed(link, "OperationalState", NULL);
+        }
 }
 
 int link_save(Link *link) {
diff --git a/src/network/networkd-link.h b/src/network/networkd-link.h
index 81e97fa951..b23712011e 100644
--- a/src/network/networkd-link.h
+++ b/src/network/networkd-link.h
@@ -36,17 +36,6 @@ typedef enum LinkState {
         _LINK_STATE_INVALID = -1
 } LinkState;
 
-typedef enum LinkOperationalState {
-        LINK_OPERSTATE_OFF,
-        LINK_OPERSTATE_NO_CARRIER,
-        LINK_OPERSTATE_DORMANT,
-        LINK_OPERSTATE_CARRIER,
-        LINK_OPERSTATE_DEGRADED,
-        LINK_OPERSTATE_ROUTABLE,
-        _LINK_OPERSTATE_MAX,
-        _LINK_OPERSTATE_INVALID = -1
-} LinkOperationalState;
-
 struct Link {
         Manager *manager;
 
@@ -128,8 +117,11 @@ int icmp6_configure(Link *link);
 const char* link_state_to_string(LinkState s) _const_;
 LinkState link_state_from_string(const char *s) _pure_;
 
-const char* link_operstate_to_string(LinkOperationalState s) _const_;
-LinkOperationalState link_operstate_from_string(const char *s) _pure_;
+extern const sd_bus_vtable link_vtable[];
+
+int link_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error);
+int link_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error);
+int link_send_changed(Link *link, const char *property, ...) _sentinel_;
 
 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_unref);
 #define _cleanup_link_unref_ _cleanup_(link_unrefp)
diff --git a/src/network/networkd-manager-bus.c b/src/network/networkd-manager-bus.c
new file mode 100644
index 0000000000..7753c5dbc9
--- /dev/null
+++ b/src/network/networkd-manager-bus.c
@@ -0,0 +1,48 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2015 Tom Gundersen
+
+  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 "bus-util.h"
+
+#include "networkd.h"
+
+static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_operational_state, link_operstate, LinkOperationalState);
+
+const sd_bus_vtable manager_vtable[] = {
+        SD_BUS_VTABLE_START(0),
+
+        SD_BUS_PROPERTY("OperationalState", "s", property_get_operational_state, offsetof(Manager, operational_state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
+
+        SD_BUS_VTABLE_END
+};
+
+int manager_send_changed(Manager *manager, const char *property, ...) {
+        char **l;
+
+        assert(manager);
+
+        l = strv_from_stdarg_alloca(property);
+
+        return sd_bus_emit_properties_changed_strv(
+                        manager->bus,
+                        "/org/freedesktop/network1",
+                        "org.freedesktop.network1.Manager",
+                        l);
+}
diff --git a/src/network/networkd-manager.c b/src/network/networkd-manager.c
index 4d27272b3b..40328a36c9 100644
--- a/src/network/networkd-manager.c
+++ b/src/network/networkd-manager.c
@@ -151,10 +151,6 @@ int manager_connect_bus(Manager *m) {
         } if (r < 0)
                 return r;
 
-        r = sd_bus_attach_event(m->bus, m->event, 0);
-        if (r < 0)
-                return r;
-
         r = sd_bus_add_match(m->bus, &m->prepare_for_sleep_slot,
                              "type='signal',"
                              "sender='org.freedesktop.login1',"
@@ -166,6 +162,26 @@ int manager_connect_bus(Manager *m) {
         if (r < 0)
                 return log_error_errno(r, "Failed to add match for PrepareForSleep: %m");
 
+        r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/network1", "org.freedesktop.network1.Manager", manager_vtable, m);
+        if (r < 0)
+                return log_error_errno(r, "Failed to add manager object vtable: %m");
+
+        r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/link", "org.freedesktop.network1.Link", link_vtable, link_object_find, m);
+        if (r < 0)
+               return log_error_errno(r, "Failed to add link object vtable: %m");
+
+        r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/link", link_node_enumerator, m);
+        if (r < 0)
+                return log_error_errno(r, "Failed to add link enumerator: %m");
+
+        r = sd_bus_request_name(m->bus, "org.freedesktop.network1", 0);
+        if (r < 0)
+                return log_error_errno(r, "Failed to register name: %m");
+
+        r = sd_bus_attach_event(m->bus, m->event, 0);
+        if (r < 0)
+                return log_error_errno(r, "Failed to attach bus to event loop: %m");
+
         return 0;
 }
 
@@ -741,6 +757,13 @@ int manager_save(Manager *m) {
                 goto fail;
         }
 
+        if (m->operational_state != operstate) {
+                m->operational_state = operstate;
+                r = manager_send_changed(m, "OperationalState", NULL);
+                if (r < 0)
+                        log_error_errno(r, "Could not emit changed OperationalState: %m");
+        }
+
         return 0;
 
 fail:
diff --git a/src/network/networkd.h b/src/network/networkd.h
index e053bd624a..9f3a5ea9d5 100644
--- a/src/network/networkd.h
+++ b/src/network/networkd.h
@@ -72,6 +72,17 @@ typedef enum LLMNRSupport {
         _LLMNR_SUPPORT_INVALID = -1,
 } LLMNRSupport;
 
+typedef enum LinkOperationalState {
+        LINK_OPERSTATE_OFF,
+        LINK_OPERSTATE_NO_CARRIER,
+        LINK_OPERSTATE_DORMANT,
+        LINK_OPERSTATE_CARRIER,
+        LINK_OPERSTATE_DEGRADED,
+        LINK_OPERSTATE_ROUTABLE,
+        _LINK_OPERSTATE_MAX,
+        _LINK_OPERSTATE_INVALID = -1
+} LinkOperationalState;
+
 struct FdbEntry {
         Network *network;
         unsigned section;
@@ -209,6 +220,7 @@ struct Manager {
         bool enumerating;
 
         char *state_file;
+        LinkOperationalState operational_state;
 
         Hashmap *links;
         Hashmap *netdevs;
@@ -222,6 +234,8 @@ extern const char* const network_dirs[];
 
 /* Manager */
 
+extern const sd_bus_vtable manager_vtable[];
+
 int manager_new(Manager **ret);
 void manager_free(Manager *m);
 
@@ -231,6 +245,7 @@ bool manager_should_reload(Manager *m);
 int manager_rtnl_enumerate_links(Manager *m);
 int manager_rtnl_enumerate_addresses(Manager *m);
 
+int manager_send_changed(Manager *m, const char *property, ...) _sentinel_;
 int manager_save(Manager *m);
 
 int manager_address_pool_acquire(Manager *m, int family, unsigned prefixlen, union in_addr_union *found);
@@ -394,3 +409,8 @@ const char *address_family_boolean_to_string(AddressFamilyBoolean b) _const_;
 AddressFamilyBoolean address_family_boolean_from_string(const char *s) _const_;
 
 int config_parse_address_family_boolean(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+
+/* Opeartional State */
+
+const char* link_operstate_to_string(LinkOperationalState s) _const_;
+LinkOperationalState link_operstate_from_string(const char *s) _pure_;
diff --git a/src/network/org.freedesktop.network1.conf b/src/network/org.freedesktop.network1.conf
new file mode 100644
index 0000000000..52dad33668
--- /dev/null
+++ b/src/network/org.freedesktop.network1.conf
@@ -0,0 +1,42 @@
+<?xml version="1.0"?> <!--*-nxml-*-->
+<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
+        "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
+
+<!--
+  This file is part of systemd.
+
+  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.
+-->
+
+<busconfig>
+
+        <policy user="systemd-network">
+                <allow own="org.freedesktop.network1"/>
+                <allow send_destination="org.freedesktop.network1"/>
+                <allow receive_sender="org.freedesktop.network1"/>
+        </policy>
+
+        <policy context="default">
+                <deny send_destination="org.freedesktop.network1"/>
+
+                <allow send_destination="org.freedesktop.network1"
+                       send_interface="org.freedesktop.DBus.Introspectable"/>
+
+                <allow send_destination="org.freedesktop.network1"
+                       send_interface="org.freedesktop.DBus.Peer"/>
+
+                <allow send_destination="org.freedesktop.network1"
+                       send_interface="org.freedesktop.DBus.Properties"
+                       send_member="Get"/>
+
+                <allow send_destination="org.freedesktop.network1"
+                       send_interface="org.freedesktop.DBus.Properties"
+                       send_member="GetAll"/>
+
+                <allow receive_sender="org.freedesktop.network1"/>
+        </policy>
+
+</busconfig>
diff --git a/src/network/org.freedesktop.network1.service b/src/network/org.freedesktop.network1.service
new file mode 100644
index 0000000000..bea885fe53
--- /dev/null
+++ b/src/network/org.freedesktop.network1.service
@@ -0,0 +1,12 @@
+#  This file is part of systemd.
+#
+#  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.
+
+[D-BUS Service]
+Name=org.freedesktop.network1
+Exec=/bin/false
+User=root
+SystemdService=dbus-org.freedesktop.network1.service
diff --git a/units/org.freedesktop.network1.busname b/units/org.freedesktop.network1.busname
new file mode 100644
index 0000000000..c68f4ade36
--- /dev/null
+++ b/units/org.freedesktop.network1.busname
@@ -0,0 +1,14 @@
+#  This file is part of systemd.
+#
+#  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.
+
+[Unit]
+Description=Network Service Bus Name
+Documentation=man:systemd-networkd.service(8)
+
+[BusName]
+Service=systemd-networkd.service
+AllowWorld=talk