nes-proj/apps/servreg-hack/servreg-hack.h

151 lines
5.5 KiB
C

/** \addtogroup apps
* @{ */
/**
* \defgroup servreghack A service registration and diseemination hack
* @{
*
* This application is a quick'n'dirty hack for registering,
* disseminating, and looking up services. A service is identified by
* an 8-bit integer between 1 and 255. Integers below 128 are reserved
* for system services.
*
* A service is registered with the function
* servreg_hack_register(). Registered services will be transmitted to
* all neighbors that run the servreg-hack application. These will in
* turn resend the registration to their neighbors.
*
* Services from neighbors are stored in a local table. Services
* stored in the table can be looked up using a combination of the
* servreg_hack_list() and servreg_hack_item_match() functions.
*
*/
/*
* Copyright (c) 2010, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
/**
* \file
* Header file for the servreg-hack application
* \author
* Adam Dunkels <adam@sics.se>
*/
#ifndef SERVREG_HACK_H
#define SERVREG_HACK_H
#include "contiki-conf.h"
#include "net/ip/uip.h"
typedef uint8_t servreg_hack_id_t;
typedef void servreg_hack_item_t;
/**
* \brief Initialize and start the servreg-hack application
*
* This function initializes and starts the servreg-hack
* application and daemon.
*/
void servreg_hack_init(void);
/**
* \brief Register that this node provides a service
* \param service_id The 8-bit ID for the service
* \param addr The address associated with the service
*
* This function is used to register a
* service. Registering a service means that other nodes
* in the network will become aware that this node
* provides this service. The servreg-hack application
* does not specify what this service means, nor does it
* provide any mechanism by which the service can be
* reached: this is up to the application that uses the
* servreg-hack application.
*/
void servreg_hack_register(servreg_hack_id_t service_id, const uip_ipaddr_t *addr);
/**
* \brief Get the IP address of a node offering a service
* \param service_id The service ID of the service
* \return A pointer to the IP address of the node, or NULL if the service was not known
*
* This function returns the address of the node offering
* a specific service. If the service is not known, the
* function returns NULL. If there are more than one nodes
* offering the service, this function returns the address
* of the node that most recently announced its service.
*
* To get a list of all nodes offering a specific service,
* use the servreg_hack_list_head() function to get the
* full list of offered services.
*/
uip_ipaddr_t * servreg_hack_lookup(servreg_hack_id_t service_id);
/**
* \brief Obtain the list of services provided by neighbors
* \return The list of services
*
* This function returns a list of services registered by
* other nodes. To find a specific service, the caller
* needs to iterate through the list and check each list
* item with the servreg_hack_item_match() function.
*/
servreg_hack_item_t *servreg_hack_list_head(void);
/**
* \brief Get the service ID for a list item
* \param item The list item
* \return The service ID for a list item
*
* This function is used when iterating through the list
* of registered services.
*/
servreg_hack_id_t servreg_hack_item_id(servreg_hack_item_t *item);
/**
* \brief Get the IP address for a list item
* \param item The list item
* \return The IP address
*
* This function is used when iterating through the list
* of registered services.
*/
uip_ipaddr_t * servreg_hack_item_address(servreg_hack_item_t *item);
#endif /* SERVREG_HACK_H */
/** @} */
/** @} */