/*
This file is part of GNUnet.
- Copyright (C) 2007-2014 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2007-2014 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
*/
/**
- * @file include/gnunet_nat_lib.h
- * @brief Library handling UPnP and NAT-PMP port forwarding and
- * external IP address retrieval
* @author Christian Grothoff
* @author Milan Bouchet-Valat
+ *
+ * @file
+ * Library handling UPnP and NAT-PMP port forwarding
+ * and external IP address retrieval
+ *
+ * @defgroup nat NAT library
+ * Library handling UPnP and NAT-PMP port forwarding
+ * and external IP address retrieval
+ *
+ * @{
*/
#ifndef GNUNET_NAT_LIB_H
struct GNUNET_NAT_Handle;
+
+/**
+ * What the situation of the NAT connectivity
+ */
+enum GNUNET_NAT_Type
+{
+ /**
+ * We have a direct connection
+ */
+ GNUNET_NAT_TYPE_NO_NAT = GNUNET_OK,
+
+ /**
+ * We are under a NAT but cannot traverse it
+ */
+ GNUNET_NAT_TYPE_UNREACHABLE_NAT,
+
+ /**
+ * We can traverse using STUN
+ */
+ GNUNET_NAT_TYPE_STUN_PUNCHED_NAT,
+
+ /**
+ * WE can traverse using UPNP
+ */
+ GNUNET_NAT_TYPE_UPNP_NAT
+
+};
+
/**
* Error Types for the NAT subsystem (which can then later be converted/resolved to a string)
*/
const socklen_t *addrlens,
GNUNET_NAT_AddressCallback address_callback,
GNUNET_NAT_ReversalCallback reversal_callback,
- void *callback_cls);
+ void *callback_cls,
+ struct GNUNET_NETWORK_Handle* sock);
/**
* @param addr the address, NULL on errors
* @param result #GNUNET_NAT_ERROR_SUCCESS on success, otherwise the specific error code
*/
-typedef void (*GNUNET_NAT_IPCallback) (void *cls,
- const struct in_addr *addr,
- enum GNUNET_NAT_StatusCode result);
-
+typedef void
+(*GNUNET_NAT_IPCallback) (void *cls,
+ const struct in_addr *addr,
+ enum GNUNET_NAT_StatusCode result);
/**
* @param diff minimal suggested changes to the original configuration
* to make it work (as best as we can)
* @param result #GNUNET_NAT_ERROR_SUCCESS on success, otherwise the specific error code
+ * @param type what the situation of the NAT
*/
typedef void
(*GNUNET_NAT_AutoResultCallback)(void *cls,
const struct GNUNET_CONFIGURATION_Handle *diff,
- enum GNUNET_NAT_StatusCode result);
+ enum GNUNET_NAT_StatusCode result,
+ enum GNUNET_NAT_Type type);
/**
void
GNUNET_NAT_autoconfig_cancel (struct GNUNET_NAT_AutoHandle *ah);
+/**
+ * Handle for active STUN Requests.
+ */
+struct GNUNET_NAT_STUN_Handle;
-struct GNUNET_NAT_StunRequestHandle;
/**
- * Make Generic STUN request and
- * Send a generic stun request to the server specified using the specified socket.
- * possibly waiting for a reply and filling the 'reply' field with
- * the externally visible address.
- *c
- * @param server, the address of the stun server
- * @param port, port of the stun server
+ * Function called with the result if an error happened during STUN request.
+ *
+ * @param cls closure
+ * @param result the specific error code
+ */
+typedef void
+(*GNUNET_NAT_STUN_ErrorCallback)(void *cls,
+ enum GNUNET_NAT_StatusCode error);
+
+
+/**
+ * Handle to a request given to the resolver. Can be used to cancel
+ * the request prior to the timeout or successful execution. Also
+ * used to track our internal state for the request.
+ */
+struct GNUNET_NAT_STUN_Handle;
+
+
+/**
+ * Make generic STUN request. Sends a generic stun request to the
+ * server specified using the specified socket. The caller must
+ * wait for a reply on the @a sock and call
+ * #GNUNET_NAT_stun_handle_packet() if a reply is received.
+ *
+ * @param server the address of the stun server
+ * @param port port of the stun server
* @param sock the socket used to send the request
- * @return GNUNET_NAT_StunRequestHandle on success, NULL on error.
+ * @param cb callback in case of error (or completion)
+ * @param cb_cls closure for @a cb
+ * @return NULL on error
*/
-struct GNUNET_NAT_StunRequestHandle *
-GNUNET_NAT_stun_make_request(char * server, int port, struct GNUNET_NETWORK_Handle * sock);
+struct GNUNET_NAT_STUN_Handle *
+GNUNET_NAT_stun_make_request (const char *server,
+ uint16_t port,
+ struct GNUNET_NETWORK_Handle *sock,
+ GNUNET_NAT_STUN_ErrorCallback cb,
+ void *cb_cls);
/**
- * Handle an incoming STUN message, Do some basic sanity checks on packet size and content,
- * try to extract a bit of information, and possibly reply.
- * At the moment this only processes BIND requests, and returns
- * the externally visible address of the request.
- * If a callback is specified, invoke it with the attribute.
+ * Cancel active STUN request. Frees associated resources
+ * and ensures that the callback is no longer invoked.
*
- * @param data, pointer where we will set the type
- * @param len, pointer where we will set the type
- * @param st, pointer where we will set the type
+ * @param rh request to cancel
+ */
+void
+GNUNET_NAT_stun_make_request_cancel (struct GNUNET_NAT_STUN_Handle *rh);
+
+
+/**
+ * Handle an incoming STUN message. Do some basic sanity checks on
+ * packet size and content, try to extract a bit of information, and
+ * possibly reply. At the moment this only processes BIND requests,
+ * and returns the externally visible address of the request. If a
+ * callback is specified, invoke it with the attribute.
+ *
+ * @param data the packet
+ * @param len the length of the packet
+ * @param arg sockaddr_in where we will set our discovered packet
+ * @return #GNUNET_OK on OK,
+ * #GNUNET_NO if the packet is not a stun packet
+ */
+int
+GNUNET_NAT_stun_handle_packet (const void *data,
+ size_t len,
+ struct sockaddr_in *arg);
+
+
+/**
+ * CHECK if is a valid STUN packet sending to #GNUNET_NAT_stun_handle_packet().
+ * It also check if it can handle the packet based on the NAT handler.
+ * You don't need to call anything else to check if the packet is valid,
*
- * @return, 0 on IGNORE, -1 if the packet is invalid ( not a stun packet)
+ * @param cls the NAT handle
+ * @param data packet
+ * @param len length of @a data
+ * @return #GNUNET_NO if it can't decode, #GNUNET_YES if is a packet
*/
int
-GNUNET_NAT_stun_handle_packet(const uint8_t *data, size_t len,struct sockaddr_in *arg);
+GNUNET_NAT_is_valid_stun_packet (void *cls,
+ const void *data,
+ size_t len);
#endif
+/** @} */ /* end of group */
+
/* end of gnunet_nat_lib.h */
projects / oweals / gnunet.git / blobdiff