server: fix uninitialized listen address

Signed-off-by: hexian000 <[email protected]>

README.md

@@ -283,6 +283,8 @@ Rendezvous mode may be useful for accessing servers behind NAT. The rendezvous s
 
 rendezvous_server : server : client = 1 : 1 : n
 
+Peers should be all IPv4 or all IPv6.
+
 ## Tunables
 
 *kcptun-libev works out of the box. In most cases, the default options are recommended.*

src/server.h

@@ -31,12 +31,13 @@ struct pktconn {
 	struct pktqueue *queue;
 	int fd;
 	int domain;
-	bool connected;
 	union sockaddr_max kcp_connect;
 	ev_tstamp last_send_time;
 	ev_tstamp last_recv_time;
 	ev_tstamp inflight_ping;
 
+	bool listened : 1;
+	bool connected : 1;
 	union sockaddr_max server_addr[2];
 	union sockaddr_max rendezvous_server;
 };

src/session.c

@@ -641,6 +641,7 @@ ss0_on_listen(struct server *restrict s, struct msgframe *restrict msg)
 		LOG_F(DEBUG, "rendezvous listen: (%s, %s)", addr1_str,
 		      addr2_str);
 	}
+	s->pkt.listened = true;
 	return true;
 }
 
@@ -657,19 +658,23 @@ ss0_on_connect(struct server *restrict s, struct msgframe *restrict msg)
 		return false;
 	}
 	if (LOGLEVEL(INFO)) {
+		char caddr1_str[64], caddr2_str[64];
+		format_sa(&addr.sa, caddr1_str, sizeof(caddr1_str));
+		format_sa(&msg->addr.sa, caddr2_str, sizeof(caddr2_str));
 		char saddr1_str[64], saddr2_str[64];
 		format_sa(
 			&s->pkt.server_addr[0].sa, saddr1_str,
 			sizeof(saddr1_str));
 		format_sa(
 			&s->pkt.server_addr[1].sa, saddr2_str,
 			sizeof(saddr2_str));
-		char caddr1_str[64], caddr2_str[64];
-		format_sa(&addr.sa, caddr1_str, sizeof(caddr1_str));
-		format_sa(&msg->addr.sa, caddr2_str, sizeof(caddr2_str));
 		LOG_F(INFO, "rendezvous connect: (%s, %s) -> (%s, %s)",
 		      caddr1_str, caddr2_str, saddr1_str, saddr2_str);
 	}
+	if (!s->pkt.listened) {
+		LOGE("rendezvous connect: no server available");
+		return true;
+	}
 
 	/* notify the server */
 	unsigned char b[INET6ADDR_LENGTH + INET6ADDR_LENGTH];