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interfaceiter.h
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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 https://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 <inttypes.h> #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). */ 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 */