[Project] Support fuzzy protocol over TCP

It seems that we need to use TCP for bulk requests in terms of performance
and network secureity. This project is intended to track all work in these
terms.

src/fuzzy_storage.c

@@ -62,8 +62,8 @@ worker_t fuzzy_worker = {
 	init_fuzzy,  /* Init function */
 	start_fuzzy, /* Start function */
 	RSPAMD_WORKER_HAS_SOCKET | RSPAMD_WORKER_NO_STRICT_CONFIG,
-	RSPAMD_WORKER_SOCKET_UDP, /* UDP socket */
-	RSPAMD_WORKER_VER         /* Version info */
+	RSPAMD_WORKER_SOCKET_UDP | RSPAMD_WORKER_SOCKET_TCP, /* UDP + TCP socket */
+	RSPAMD_WORKER_VER                                    /* Version info */
 };
 
 struct fuzzy_global_stat {
@@ -1970,11 +1970,41 @@ union sa_union {
 	struct sockaddr_un su;
 	struct sockaddr_storage ss;
 };
+
+static void
+accept_tcp_fuzzy_socket(EV_P_ ev_io *w, int revents)
+{
+	struct rspamd_worker *worker = (struct rspamd_worker *) w->data;
+	struct rspamd_fuzzy_storage_ctx *ctx;
+	struct fuzzy_session *session;
+
+	ctx = (struct rspamd_fuzzy_storage_ctx *) worker->ctx;
+
+	int nfd;
+	rspamd_inet_addr_t *addr = NULL;
+
+	if ((nfd =
+			 rspamd_accept_from_socket(w->fd, &addr,
+									   rspamd_worker_throttle_accept_events, worker->accept_events)) == -1) {
+		msg_err("accept failed: %s", strerror(errno));
+		return;
+	}
+
+	if (!rspamd_fuzzy_check_client(worker->ctx, addr)) {
+		/* Disallow forbidden clients silently (maybe we should even tarpit?) */
+		rspamd_inet_address_free(addr);
+		close(nfd);
+
+		return;
+	}
+}
+
+
 /*
  * Accept new connection and construct task
  */
 static void
-accept_fuzzy_socket(EV_P_ ev_io *w, int revents)
+accept_udp_fuzzy_socket(EV_P_ ev_io *w, int revents)
 {
 	struct rspamd_worker *worker = (struct rspamd_worker *) w->data;
 	struct rspamd_fuzzy_storage_ctx *ctx;
@@ -3207,14 +3237,19 @@ fuzzy_peer_rep(struct rspamd_worker *worker,
 				ac_ev = g_malloc0(sizeof(*ac_ev));
 				ac_ev->accept_ev.data = worker;
 				ac_ev->event_loop = ctx->event_loop;
-				ev_io_init(&ac_ev->accept_ev, accept_fuzzy_socket, ls->fd,
+				ev_io_init(&ac_ev->accept_ev, accept_udp_fuzzy_socket, ls->fd,
 						   EV_READ);
 				ev_io_start(ctx->event_loop, &ac_ev->accept_ev);
 				DL_APPEND(worker->accept_events, ac_ev);
 			}
 			else {
-				/* We allow TCP listeners only for a update worker */
-				g_assert_not_reached();
+				ac_ev = g_malloc0(sizeof(*ac_ev));
+				ac_ev->accept_ev.data = worker;
+				ac_ev->event_loop = ctx->event_loop;
+				ev_io_init(&ac_ev->accept_ev, accept_tcp_fuzzy_socket, ls->fd,
+						   EV_READ);
+				ev_io_start(ctx->event_loop, &ac_ev->accept_ev);
+				DL_APPEND(worker->accept_events, ac_ev);
 			}
 		}