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/* $Id: stun_sock.h 2966 2009-10-25 09:02:07Z bennylp $ */
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* Copyright (C) 2008-2009 Teluu Inc. (http://www.teluu.com)
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* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* Additional permission under GNU GPL version 3 section 7:
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* If you modify this program, or any covered work, by linking or
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* combining it with the OpenSSL project's OpenSSL library (or a
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* modified version of that library), containing parts covered by the
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* terms of the OpenSSL or SSLeay licenses, Teluu Inc. (http://www.teluu.com)
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* grants you additional permission to convey the resulting work.
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* Corresponding Source for a non-source form of such a combination
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* shall include the source code for the parts of OpenSSL used as well
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* as that of the covered work.
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#ifndef __PJNATH_STUN_SOCK_H__
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#define __PJNATH_STUN_SOCK_H__
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* @brief STUN aware socket transport
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#include <pjnath/stun_config.h>
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#include <pjlib-util/resolver.h>
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#include <pj/ioqueue.h>
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#include <pj/sock_qos.h>
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* @addtogroup PJNATH_STUN_SOCK
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* The STUN transport provides asynchronous UDP like socket transport
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* with the additional STUN capability. It has the following features:
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* - API to send and receive UDP packets
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* - multiplex STUN and non-STUN incoming packets and distinguish between
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* STUN responses that belong to internal requests with application data
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* (the application data may be STUN packets as well)
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* - DNS SRV resolution to the STUN server (if wanted), along with fallback
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* to DNS A resolution if SRV record is not found.
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* - STUN keep-alive maintenance, and handle changes to the mapped address
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* (when the NAT binding changes)
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* Opaque type to represent a STUN transport.
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typedef struct pj_stun_sock pj_stun_sock;
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* Types of operation being reported in \a on_status() callback of
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* pj_stun_sock_cb. Application may retrieve the string representation
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* of these constants with pj_stun_sock_op_name().
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typedef enum pj_stun_sock_op
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* Asynchronous DNS resolution.
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PJ_STUN_SOCK_DNS_OP = 1,
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* Initial STUN Binding request.
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PJ_STUN_SOCK_BINDING_OP,
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* Subsequent STUN Binding request for keeping the binding
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PJ_STUN_SOCK_KEEP_ALIVE_OP,
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* IP address change notification from the keep-alive operation.
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PJ_STUN_SOCK_MAPPED_ADDR_CHANGE
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* This structure contains callbacks that will be called by the STUN
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* transport to notify application about various events.
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typedef struct pj_stun_sock_cb
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* Notification when incoming packet has been received.
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* @param stun_sock The STUN transport.
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* @param data The packet.
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* @param data_len Length of the packet.
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* @param src_addr The source address of the packet.
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* @param addr_len The length of the source address.
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* @return Application should normally return PJ_TRUE to let
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* the STUN transport continue its operation. However
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* it must return PJ_FALSE if it has destroyed the
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* STUN transport in this callback.
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pj_bool_t (*on_rx_data)(pj_stun_sock *stun_sock,
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const pj_sockaddr_t *src_addr,
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* Notifification when asynchronous send operation has completed.
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* @param stun_sock The STUN transport.
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* @param send_key The send operation key that was given in
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* #pj_stun_sock_sendto().
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* @param sent If value is positive non-zero it indicates the
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* number of data sent. When the value is negative,
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* it contains the error code which can be retrieved
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* by negating the value (i.e. status=-sent).
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* @return Application should normally return PJ_TRUE to let
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* the STUN transport continue its operation. However
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* it must return PJ_FALSE if it has destroyed the
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* STUN transport in this callback.
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pj_bool_t (*on_data_sent)(pj_stun_sock *stun_sock,
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pj_ioqueue_op_key_t *send_key,
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* Notification when the status of the STUN transport has changed. This
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* callback may be called for the following conditions:
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* - the first time the publicly mapped address has been resolved from
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* the STUN server, this callback will be called with \a op argument
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* set to PJ_STUN_SOCK_BINDING_OP \a status argument set to
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* - anytime when the transport has detected that the publicly mapped
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* address has changed, this callback will be called with \a op
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* argument set to PJ_STUN_SOCK_KEEP_ALIVE_OP and \a status
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* argument set to PJ_SUCCESS. On this case and the case above,
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* application will get the resolved public address in the
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* #pj_stun_sock_info structure.
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* - for any terminal error (such as STUN time-out, DNS resolution
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* failure, or keep-alive failure), this callback will be called
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* with the \a status argument set to non-PJ_SUCCESS.
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* @param stun_sock The STUN transport.
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* @param op The operation that triggers the callback.
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* @param status The status.
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* @return Must return PJ_FALSE if it has destroyed the
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* STUN transport in this callback. Application should
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* normally destroy the socket and return PJ_FALSE
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* upon encountering terminal error, otherwise it
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* should return PJ_TRUE to let the STUN socket operation
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pj_bool_t (*on_status)(pj_stun_sock *stun_sock,
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* This structure contains information about the STUN transport. Application
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* may query this information by calling #pj_stun_sock_get_info().
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typedef struct pj_stun_sock_info
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* The bound address of the socket.
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pj_sockaddr bound_addr;
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* IP address of the STUN server.
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pj_sockaddr srv_addr;
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* The publicly mapped address. It may contain zero address when the
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* mapped address has not been resolved. Application may query whether
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* this field contains valid address with pj_sockaddr_has_addr().
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pj_sockaddr mapped_addr;
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* Number of interface address aliases. The interface address aliases
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* are list of all interface addresses in this host.
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* Array of interface address aliases.
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pj_sockaddr aliases[PJ_ICE_ST_MAX_CAND];
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* This describe the settings to be given to the STUN transport during its
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* creation. Application should initialize this structure by calling
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* #pj_stun_sock_cfg_default().
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typedef struct pj_stun_sock_cfg
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* Packet buffer size. Default value is PJ_STUN_SOCK_PKT_LEN.
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unsigned max_pkt_size;
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* Specify the number of simultaneous asynchronous read operations to
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* be invoked to the ioqueue. Having more than one read operations will
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* increase performance on multiprocessor systems since the application
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* will be able to process more than one incoming packets simultaneously.
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* Default value is 1.
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* Specify the interface where the socket should be bound to. If the
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* address is zero, socket will be bound to INADDR_ANY. If the address
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* is non-zero, socket will be bound to this address only, and the
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* transport will have only one address alias (the \a alias_cnt field
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* in #pj_stun_sock_info structure.
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pj_sockaddr bound_addr;
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* Specify the STUN keep-alive duration, in seconds. The STUN transport
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* does keep-alive by sending STUN Binding request to the STUN server.
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* If this value is zero, the PJ_STUN_KEEP_ALIVE_SEC value will be used.
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* If the value is negative, it will disable STUN keep-alive.
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* QoS traffic type to be set on this transport. When application wants
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* to apply QoS tagging to the transport, it's preferable to set this
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* field rather than \a qos_param fields since this is more portable.
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* Default value is PJ_QOS_TYPE_BEST_EFFORT.
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pj_qos_type qos_type;
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* Set the low level QoS parameters to the transport. This is a lower
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* level operation than setting the \a qos_type field and may not be
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* supported on all platforms.
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* By default all settings in this structure are disabled.
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pj_qos_params qos_params;
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* Specify if STUN socket should ignore any errors when setting the QoS
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* traffic type/parameters.
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pj_bool_t qos_ignore_error;
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* Retrieve the name representing the specified operation.
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PJ_DECL(const char*) pj_stun_sock_op_name(pj_stun_sock_op op);
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* Initialize the STUN transport setting with its default values.
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* @param cfg The STUN transport config.
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PJ_DECL(void) pj_stun_sock_cfg_default(pj_stun_sock_cfg *cfg);
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* Create the STUN transport using the specified configuration. Once
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* the STUN transport has been create, application should call
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* #pj_stun_sock_start() to start the transport.
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* @param stun_cfg The STUN configuration which contains among other
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* things the ioqueue and timer heap instance for
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* the operation of this transport.
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* @param af Address family of socket. Currently pj_AF_INET()
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* and pj_AF_INET6() are supported.
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* @param name Optional name to be given to this transport to
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* @param cb Callback to receive events/data from the transport.
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* @param cfg Optional transport settings.
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* @param user_data Arbitrary application data to be associated with
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* @param p_sock Pointer to receive the created transport instance.
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* @return PJ_SUCCESS if the operation has been successful,
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* or the appropriate error code on failure.
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PJ_DECL(pj_status_t) pj_stun_sock_create(pj_stun_config *stun_cfg,
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const pj_stun_sock_cb *cb,
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const pj_stun_sock_cfg *cfg,
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pj_stun_sock **p_sock);
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* Start the STUN transport. This will start the DNS SRV resolution for
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* the STUN server (if desired), and once the server is resolved, STUN
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* Binding request will be sent to resolve the publicly mapped address.
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* Once the initial STUN Binding response is received, the keep-alive
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* timer will be started.
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* @param stun_sock The STUN transport instance.
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* @param domain The domain, hostname, or IP address of the TURN
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* server. When this parameter contains domain name,
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* the \a resolver parameter must be set to activate
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* DNS SRV resolution.
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* @param default_port The default STUN port number to use when DNS SRV
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* resolution is not used. If DNS SRV resolution is
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* used, the server port number will be set from the
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* DNS SRV records. The recommended value for this
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* parameter is PJ_STUN_PORT.
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* @param resolver If this parameter is not NULL, then the \a domain
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* parameter will be first resolved with DNS SRV and
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* then fallback to using DNS A/AAAA resolution when
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* DNS SRV resolution fails. If this parameter is
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* NULL, the \a domain parameter will be resolved as
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* @return PJ_SUCCESS if the operation has been successfully
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* queued, or the appropriate error code on failure.
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* When this function returns PJ_SUCCESS, the final
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* result of the allocation process will be notified
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* to application in \a on_state() callback.
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PJ_DECL(pj_status_t) pj_stun_sock_start(pj_stun_sock *stun_sock,
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const pj_str_t *domain,
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pj_uint16_t default_port,
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pj_dns_resolver *resolver);
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* Destroy the STUN transport.
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* @param sock The STUN transport socket.
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* @return PJ_SUCCESS if the operation has been successful,
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* or the appropriate error code on failure.
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PJ_DECL(pj_status_t) pj_stun_sock_destroy(pj_stun_sock *sock);
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* Associate a user data with this STUN transport. The user data may then
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* be retrieved later with #pj_stun_sock_get_user_data().
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* @param stun_sock The STUN transport instance.
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* @param user_data Arbitrary data.
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* @return PJ_SUCCESS if the operation has been successful,
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* or the appropriate error code on failure.
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PJ_DECL(pj_status_t) pj_stun_sock_set_user_data(pj_stun_sock *stun_sock,
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* Retrieve the previously assigned user data associated with this STUN
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* @param stun_sock The STUN transport instance.
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* @return The user/application data.
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PJ_DECL(void*) pj_stun_sock_get_user_data(pj_stun_sock *stun_sock);
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* Get the STUN transport info. The transport info contains, among other
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* things, the allocated relay address.
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* @param stun_sock The STUN transport instance.
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* @param info Pointer to be filled with STUN transport info.
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* @return PJ_SUCCESS if the operation has been successful,
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* or the appropriate error code on failure.
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PJ_DECL(pj_status_t) pj_stun_sock_get_info(pj_stun_sock *stun_sock,
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pj_stun_sock_info *info);
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* Send a data to the specified address. This function may complete
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* asynchronously and in this case \a on_data_sent() will be called.
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* @param stun_sock The STUN transport instance.
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* @param send_key Optional send key for sending the packet down to
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* the ioqueue. This value will be given back to
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* \a on_data_sent() callback
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* @param pkt The data/packet to be sent to peer.
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* @param pkt_len Length of the data.
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* @param flag pj_ioqueue_sendto() flag.
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* @param dst_addr The remote address.
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* @param addr_len Length of the address.
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* @return PJ_SUCCESS if data has been sent immediately, or
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* PJ_EPENDING if data cannot be sent immediately. In
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* this case the \a on_data_sent() callback will be
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* called when data is actually sent. Any other return
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* value indicates error condition.
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PJ_DECL(pj_status_t) pj_stun_sock_sendto(pj_stun_sock *stun_sock,
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pj_ioqueue_op_key_t *send_key,
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const pj_sockaddr_t *dst_addr,
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#endif /* __PJNATH_STUN_SOCK_H__ */