modules/websocket: Fix connection leaks

- Decrease the TCP connection reference count after each use
(cherry picked from commit 27474179bdeef0ddaba05389f510446a387d85e1)

Resolved conflicts due to new feeatures in master:

	modules/websocket/ws_conn.c
	modules/websocket/ws_handshake.c

modules/websocket/ws_conn.c

@@ -325,6 +325,7 @@ void wsconn_close_now(ws_connection_t *wsc)
 		return;
 	}
 
+	tcpconn_put(con);
 	con->send_flags.f |= SND_F_CON_CLOSE;
 	con->state = S_CONN_BAD;
 	con->timeout = get_ticks_raw();
@@ -383,8 +384,12 @@ static int add_node(struct mi_root *tree, ws_connection_t *wsc)
 					wsconn_state_str[wsc->state],
 					pong,
 					interval) == 0)
+		{
+			tcpconn_put(con);
 			return -1;
+		}
 
+		tcpconn_put(con);
 		return 1;
 	}
 	else

modules/websocket/ws_frame.c

@@ -231,6 +231,7 @@ static int encode_and_send_ws_frame(ws_frame_t *frame, conn_close_t conn_close)
 		if (wsconn_rm(frame->wsc, WSCONN_EVENTROUTE_YES) < 0)
 		{
 			LM_ERR("removing WebSocket connection\n");
+			tcpconn_put(con);
 			pkg_free(send_buf);
 			return -1;
 		}
@@ -243,6 +244,7 @@ static int encode_and_send_ws_frame(ws_frame_t *frame, conn_close_t conn_close)
 			STATS_TX_DROPS;
 			LM_WARN("TCP disabled\n");
 			pkg_free(send_buf);
+			tcpconn_put(con);
 			return -1;
 		}		
 	}
@@ -254,6 +256,7 @@ static int encode_and_send_ws_frame(ws_frame_t *frame, conn_close_t conn_close)
 			STATS_TX_DROPS;
 			LM_WARN("TLS disabled\n");
 			pkg_free(send_buf);
+			tcpconn_put(con);
 			return -1;
 		}		
 	}
@@ -280,12 +283,14 @@ static int encode_and_send_ws_frame(ws_frame_t *frame, conn_close_t conn_close)
 		update_stat(ws_failed_connections, 1);
 		if (wsconn_rm(frame->wsc, WSCONN_EVENTROUTE_YES) < 0)
 			LM_ERR("removing WebSocket connection\n");
+		tcpconn_put(con);
 		return -1;
 	}
 
 	update_stat(ws_transmitted_frames, 1);
 
 	pkg_free(send_buf);
+	tcpconn_put(con);
 	return 0;
 }
 

modules/websocket/ws_handshake.c

@@ -146,7 +146,7 @@ int ws_handle_handshake(struct sip_msg *msg)
 	if (con->type != PROTO_TCP && con->type != PROTO_TLS)
 	{
 		LM_ERR("unsupported transport: %d", con->type);
-		return 0;
+		goto end;
 	}
 
 	if (parse_headers(msg, HDR_EOH_F, 0) < 0)
@@ -154,7 +154,7 @@ int ws_handle_handshake(struct sip_msg *msg)
 		LM_ERR("error parsing headers\n");
 		ws_send_reply(msg, 500, &str_status_internal_server_error,
 				NULL);
-		return 0;
+		goto end;
 	}
 
 	/* Process HTTP headers */
@@ -201,7 +201,7 @@ int ws_handle_handshake(struct sip_msg *msg)
 				ws_send_reply(msg, 400,
 						&str_status_bad_request,
 						NULL);
-				return 0;
+				goto end;
 			}
 
 			LM_DBG("found %.*s: %.*s\n",
@@ -245,7 +245,7 @@ int ws_handle_handshake(struct sip_msg *msg)
 				ws_send_reply(msg, 400,
 						&str_status_bad_request,
 						NULL);
-				return 0;
+				goto end;
 			}
 
 			str2sint(&hdr->body, &version);
@@ -263,7 +263,7 @@ int ws_handle_handshake(struct sip_msg *msg)
 				ws_send_reply(msg, 426,
 						&str_status_upgrade_required,
 						&headers);
-				return 0;
+				goto end;
 			}
 
 			LM_DBG("found %.*s: %.*s\n",
@@ -308,7 +308,7 @@ int ws_handle_handshake(struct sip_msg *msg)
 					str_hdr_sec_websocket_version.s,
 					WS_VERSION);
 		ws_send_reply(msg, 400, &str_status_bad_request, &headers);
-		return 0;
+		goto end;
 	}
 
 	/* Construct reply_key */
@@ -319,7 +319,7 @@ int ws_handle_handshake(struct sip_msg *msg)
 		LM_ERR("allocating pkg memory\n");
 		ws_send_reply(msg, 500, &str_status_internal_server_error,
 				NULL);
-		return 0;
+		goto end;
 	}
 	memcpy(reply_key.s, key.s, key.len);
 	memcpy(reply_key.s + key.len, str_ws_guid.s, str_ws_guid.len);
@@ -380,10 +380,15 @@ int ws_handle_handshake(struct sip_msg *msg)
 		if ((wsc = wsconn_get(msg->rcv.proto_reserved1)) != NULL)
 			wsconn_rm(wsc, WSCONN_EVENTROUTE_NO);
 
-		return 0;
+		goto end;
 	}
 
+	tcpconn_put(con);
 	return 1;
+end:
+	if (con)
+		tcpconn_put(con);
+	return 0;
 }
 
 struct mi_root *ws_mi_disable(struct mi_root *cmd, void *param)