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Diffstat (limited to 'lib/isc/include/isc/interfaceiter.h')
| -rw-r--r-- | lib/isc/include/isc/interfaceiter.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/lib/isc/include/isc/interfaceiter.h b/lib/isc/include/isc/interfaceiter.h new file mode 100644 index 0000000..c696091 --- /dev/null +++ b/lib/isc/include/isc/interfaceiter.h @@ -0,0 +1,127 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * SPDX-License-Identifier: MPL-2.0 + * + * 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. + */ + +#pragma once + +/***** +***** 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 |