+static Address* link_find_dhcp_server_address(Link *link) {
+ Address *address;
+
+ assert(link);
+ assert(link->network);
+
+ /* The the first statically configured address if there is any */
+ LIST_FOREACH(addresses, address, link->network->static_addresses) {
+
+ if (address->family != AF_INET)
+ continue;
+
+ if (in_addr_null(address->family, &address->in_addr))
+ continue;
+
+ return address;
+ }
+
+ /* If that didn't work, find a suitable address we got from the pool */
+ LIST_FOREACH(addresses, address, link->pool_addresses) {
+ if (address->family != AF_INET)
+ continue;
+
+ return address;
+ }
+
+ return NULL;
+}
+
+static int link_enter_configured(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->state == LINK_STATE_SETTING_ROUTES);
+
+ if (link->network->dhcp_server) {
+ struct in_addr pool_start;
+ Address *address;
+
+ address = link_find_dhcp_server_address(link);
+ if (!address) {
+ log_warning_link(link, "Failed to find suitable address for DHCPv4 server instance.");
+ link_enter_failed(link);
+ return 0;
+ }
+
+ log_debug_link(link, "offering DHCPv4 leases");
+
+ r = sd_dhcp_server_set_address(link->dhcp_server, &address->in_addr.in);
+ if (r < 0)
+ return r;
+
+ /* offer 32 addresses starting from the address following the server address */
+ pool_start.s_addr = htobe32(be32toh(address->in_addr.in.s_addr) + 1);
+ r = sd_dhcp_server_set_lease_pool(link->dhcp_server,
+ &pool_start, 32);
+ if (r < 0)
+ return r;
+
+ /* TODO:
+ r = sd_dhcp_server_set_router(link->dhcp_server,
+ &main_address->in_addr.in);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_server_set_prefixlen(link->dhcp_server,
+ main_address->prefixlen);
+ if (r < 0)
+ return r;
+ */
+
+ r = sd_dhcp_server_start(link->dhcp_server);
+ if (r < 0) {
+ log_warning_link(link, "could not start DHCPv4 server "
+ "instance: %s", strerror(-r));
+
+ link_enter_failed(link);
+
+ return 0;
+ }
+ }
+
+ log_info_link(link, "link configured");
+
+ link->state = LINK_STATE_CONFIGURED;
+
+ link_save(link);
+
+ return 0;
+}
+