netconfig: Obtain all currently assigned IPv4 addresses

src/netconfig.c

@@ -195,6 +195,22 @@ static void netconfig_ifaddr_notify(uint16_t type, const void *data,
 	}
 }
 
+static void netconfig_ifaddr_cmd_cb(int error, uint16_t type,
+						const void *data, uint32_t len,
+						void *user_data)
+{
+	if (error) {
+		l_error("netconfig: ifaddr command failure. "
+				"Error %d: %s", error, strerror(-error));
+		return;
+	}
+
+	if (type != RTM_NEWADDR)
+		return;
+
+	netconfig_ifaddr_notify(type, data, len, user_data);
+}
+
 bool netconfig_ifindex_add(uint32_t ifindex)
 {
 	struct netconfig *netconfig;
@@ -272,6 +288,15 @@ static int netconfig_init(void)
 		return r;
 	}
 
+	r = rtnl_ifaddr_get(rtnl, netconfig_ifaddr_cmd_cb, NULL, NULL);
+	if (!r) {
+		l_error("netconfig: Failed to get addresses from RTNL link.");
+		l_netlink_destroy(rtnl);
+		rtnl = NULL;
+
+		return r;
+	}
+
 	netconfig_list = l_queue_new();
 
 	return 0;

src/rtnlutil.c

@@ -110,3 +110,24 @@ void rtnl_ifaddr_extract(const struct ifaddrmsg *ifa, int bytes,
 		}
 	}
 }
+
+uint32_t rtnl_ifaddr_get(struct l_netlink *rtnl, l_netlink_command_func_t cb,
+					void *user_data,
+					l_netlink_destroy_func_t destroy)
+{
+	struct ifaddrmsg *rtmmsg;
+	uint32_t id;
+
+	rtmmsg = l_malloc(sizeof(struct ifaddrmsg));
+	explicit_bzero(rtmmsg, sizeof(struct ifaddrmsg));
+
+	rtmmsg->ifa_family = AF_INET;
+
+	id = l_netlink_send(rtnl, RTM_GETADDR, NLM_F_DUMP, rtmmsg,
+				sizeof(struct ifaddrmsg), cb, user_data,
+				destroy);
+
+	l_free(rtmmsg);
+
+	return id;
+}

src/rtnlutil.h

@@ -28,3 +28,6 @@ uint32_t rtnl_set_linkmode_and_operstate(struct l_netlink *rtnl, int ifindex,
 
 void rtnl_ifaddr_extract(const struct ifaddrmsg *ifa, int bytes,
 				char **label, char **ip, char **broadcast);
+uint32_t rtnl_ifaddr_get(struct l_netlink *rtnl, l_netlink_command_func_t cb,
+				void *user_data,
+				l_netlink_destroy_func_t destroy);