+ assert(m);
+
+ /* First, subscibe to interfaces coming and going */
+ r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_attach_event(m->rtnl, m->event, 0);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, manager_process_link, m);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, manager_process_link, m);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_add_match(m->rtnl, RTM_NEWADDR, manager_process_address, m);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_add_match(m->rtnl, RTM_DELADDR, manager_process_address, m);
+ if (r < 0)
+ return r;
+
+ /* Then, enumerate all links */
+ r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_message_request_dump(req, true);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_call(m->rtnl, req, 0, &reply);
+ if (r < 0)
+ return r;
+
+ for (i = reply; i; i = sd_rtnl_message_next(i)) {
+ r = manager_process_link(m->rtnl, i, m);
+ if (r < 0)
+ return r;
+ }
+
+ req = sd_rtnl_message_unref(req);
+ reply = sd_rtnl_message_unref(reply);
+
+ /* Finally, enumerate all addresses, too */
+ r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_message_request_dump(req, true);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_call(m->rtnl, req, 0, &reply);
+ if (r < 0)
+ return r;
+
+ for (i = reply; i; i = sd_rtnl_message_next(i)) {
+ r = manager_process_address(m->rtnl, i, m);
+ if (r < 0)
+ return r;
+ }
+
+ return r;
+}
+
+static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+ Manager *m = userdata;
+ Iterator i;
+ Link *l;
+ int r;
+
+ assert(m);
+
+ sd_network_monitor_flush(m->network_monitor);
+
+ HASHMAP_FOREACH(l, m->links, i) {
+ r = link_update_monitor(l);
+ if (r < 0)
+ log_warning("Failed to update monitor information for %i: %s", l->ifindex, strerror(-r));
+ }
+
+ r = manager_write_resolv_conf(m);
+ if (r < 0)
+ log_warning("Could not update resolv.conf: %s", strerror(-r));
+
+ return 0;
+}
+
+static int manager_network_monitor_listen(Manager *m) {
+ int r, fd, events;
+
+ assert(m);
+
+ r = sd_network_monitor_new(NULL, &m->network_monitor);
+ if (r < 0)
+ return r;
+
+ fd = sd_network_monitor_get_fd(m->network_monitor);
+ if (fd < 0)
+ return fd;
+
+ events = sd_network_monitor_get_events(m->network_monitor);
+ if (events < 0)
+ return events;
+
+ r = sd_event_add_io(m->event, &m->network_event_source, fd, events, &on_network_event, m);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static int parse_dns_server_string(Manager *m, const char *string) {