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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef ISC_INTERFACEITER_H
#define ISC_INTERFACEITER_H 1
/*****
***** Module Info
*****/
/*! \file isc/interfaceiter.h
* \brief Iterates over the list of network interfaces.
*
* Interfaces whose address family is not supported are ignored and never
* returned by the iterator. Interfaces whose netmask, interface flags,
* or similar cannot be obtained are also ignored, and the failure is logged.
*
* Standards:
* The API for scanning varies greatly among operating systems.
* This module attempts to hide the differences.
*/
/***
*** Imports
***/
#include <isc/lang.h>
#include <isc/netaddr.h>
#include <isc/types.h>
/*!
* \brief Public structure describing a network interface.
*/
struct isc_interface {
char name[32]; /*%< Interface name, null-terminated. */
unsigned int af; /*%< Address family. */
isc_netaddr_t address; /*%< Local address. */
isc_netaddr_t netmask; /*%< Network mask. */
isc_netaddr_t dstaddress; /*%< Destination address (point-to-point only). */
isc_uint32_t flags; /*%< Flags; see INTERFACE flags. */
};
/*@{*/
/*! Interface flags. */
#define INTERFACE_F_UP 0x00000001U
#define INTERFACE_F_POINTTOPOINT 0x00000002U
#define INTERFACE_F_LOOPBACK 0x00000004U
/*@}*/
/***
*** Functions
***/
ISC_LANG_BEGINDECLS
isc_result_t
isc_interfaceiter_create(isc_mem_t *mctx, isc_interfaceiter_t **iterp);
/*!<
* \brief Create an iterator for traversing the operating system's list
* of network interfaces.
*
* Returns:
*\li #ISC_R_SUCCESS
* \li #ISC_R_NOMEMORY
*\li Various network-related errors
*/
isc_result_t
isc_interfaceiter_first(isc_interfaceiter_t *iter);
/*!<
* \brief Position the iterator on the first interface.
*
* Returns:
*\li #ISC_R_SUCCESS Success.
*\li #ISC_R_NOMORE There are no interfaces.
*/
isc_result_t
isc_interfaceiter_current(isc_interfaceiter_t *iter,
isc_interface_t *ifdata);
/*!<
* \brief Get information about the interface the iterator is currently
* positioned at and store it at *ifdata.
*
* Requires:
*\li The iterator has been successfully positioned using
* isc_interface_iter_first() / isc_interface_iter_next().
*
* Returns:
*\li #ISC_R_SUCCESS Success.
*/
isc_result_t
isc_interfaceiter_next(isc_interfaceiter_t *iter);
/*!<
* \brief Position the iterator on the next interface.
*
* Requires:
* \li The iterator has been successfully positioned using
* isc_interface_iter_first() / isc_interface_iter_next().
*
* Returns:
*\li #ISC_R_SUCCESS Success.
*\li #ISC_R_NOMORE There are no more interfaces.
*/
void
isc_interfaceiter_destroy(isc_interfaceiter_t **iterp);
/*!<
* \brief Destroy the iterator.
*/
ISC_LANG_ENDDECLS
#endif /* ISC_INTERFACEITER_H */