685 lines
21 KiB
C
685 lines
21 KiB
C
/* $NetBSD: util.h,v 1.2 2013/04/11 16:56:42 christos Exp $ */
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/*
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* Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _EVENT2_UTIL_H_
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#define _EVENT2_UTIL_H_
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/** @file event2/util.h
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Common convenience functions for cross-platform portability and
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related socket manipulations.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <event2/event-config.h>
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#ifdef _EVENT_HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#ifdef _EVENT_HAVE_STDINT_H
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#include <stdint.h>
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#elif defined(_EVENT_HAVE_INTTYPES_H)
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#include <inttypes.h>
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#endif
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#ifdef _EVENT_HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef _EVENT_HAVE_STDDEF_H
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#include <stddef.h>
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#endif
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#ifdef _MSC_VER
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#include <BaseTsd.h>
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#endif
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#include <stdarg.h>
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#ifdef _EVENT_HAVE_NETDB_H
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#if !defined(_GNU_SOURCE)
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#define _GNU_SOURCE
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#endif
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#include <netdb.h>
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#endif
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#ifdef WIN32
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#include <winsock2.h>
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#else
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#include <sys/socket.h>
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#endif
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/* Some openbsd autoconf versions get the name of this macro wrong. */
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#if defined(_EVENT_SIZEOF_VOID__) && !defined(_EVENT_SIZEOF_VOID_P)
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#define _EVENT_SIZEOF_VOID_P _EVENT_SIZEOF_VOID__
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#endif
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/**
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* @name Standard integer types.
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*
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* Integer type definitions for types that are supposed to be defined in the
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* C99-specified stdint.h. Shamefully, some platforms do not include
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* stdint.h, so we need to replace it. (If you are on a platform like this,
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* your C headers are now over 10 years out of date. You should bug them to
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* do something about this.)
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*
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* We define:
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*
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* <dl>
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* <dt>ev_uint64_t, ev_uint32_t, ev_uint16_t, ev_uint8_t</dt>
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* <dd>unsigned integer types of exactly 64, 32, 16, and 8 bits
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* respectively.</dd>
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* <dt>ev_int64_t, ev_int32_t, ev_int16_t, ev_int8_t</dt>
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* <dd>signed integer types of exactly 64, 32, 16, and 8 bits
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* respectively.</dd>
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* <dt>ev_uintptr_t, ev_intptr_t</dt>
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* <dd>unsigned/signed integers large enough
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* to hold a pointer without loss of bits.</dd>
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* <dt>ev_ssize_t</dt>
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* <dd>A signed type of the same size as size_t</dd>
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* <dt>ev_off_t</dt>
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* <dd>A signed type typically used to represent offsets within a
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* (potentially large) file</dd>
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*
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* @{
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*/
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#ifdef _EVENT_HAVE_UINT64_T
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#define ev_uint64_t uint64_t
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#define ev_int64_t int64_t
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#elif defined(WIN32)
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#define ev_uint64_t unsigned __int64
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#define ev_int64_t signed __int64
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#elif _EVENT_SIZEOF_LONG_LONG == 8
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#define ev_uint64_t unsigned long long
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#define ev_int64_t long long
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#elif _EVENT_SIZEOF_LONG == 8
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#define ev_uint64_t unsigned long
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#define ev_int64_t long
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#elif defined(_EVENT_IN_DOXYGEN)
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#define ev_uint64_t ...
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#define ev_int64_t ...
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#else
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#error "No way to define ev_uint64_t"
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#endif
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#ifdef _EVENT_HAVE_UINT32_T
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#define ev_uint32_t uint32_t
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#define ev_int32_t int32_t
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#elif defined(WIN32)
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#define ev_uint32_t unsigned int
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#define ev_int32_t signed int
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#elif _EVENT_SIZEOF_LONG == 4
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#define ev_uint32_t unsigned long
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#define ev_int32_t signed long
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#elif _EVENT_SIZEOF_INT == 4
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#define ev_uint32_t unsigned int
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#define ev_int32_t signed int
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#elif defined(_EVENT_IN_DOXYGEN)
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#define ev_uint32_t ...
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#define ev_int32_t ...
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#else
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#error "No way to define ev_uint32_t"
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#endif
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#ifdef _EVENT_HAVE_UINT16_T
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#define ev_uint16_t uint16_t
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#define ev_int16_t int16_t
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#elif defined(WIN32)
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#define ev_uint16_t unsigned short
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#define ev_int16_t signed short
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#elif _EVENT_SIZEOF_INT == 2
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#define ev_uint16_t unsigned int
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#define ev_int16_t signed int
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#elif _EVENT_SIZEOF_SHORT == 2
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#define ev_uint16_t unsigned short
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#define ev_int16_t signed short
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#elif defined(_EVENT_IN_DOXYGEN)
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#define ev_uint16_t ...
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#define ev_int16_t ...
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#else
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#error "No way to define ev_uint16_t"
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#endif
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#ifdef _EVENT_HAVE_UINT8_T
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#define ev_uint8_t uint8_t
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#define ev_int8_t int8_t
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#elif defined(_EVENT_IN_DOXYGEN)
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#define ev_uint8_t ...
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#define ev_int8_t ...
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#else
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#define ev_uint8_t unsigned char
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#define ev_int8_t signed char
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#endif
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#ifdef _EVENT_HAVE_UINTPTR_T
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#define ev_uintptr_t uintptr_t
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#define ev_intptr_t intptr_t
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#elif _EVENT_SIZEOF_VOID_P <= 4
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#define ev_uintptr_t ev_uint32_t
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#define ev_intptr_t ev_int32_t
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#elif _EVENT_SIZEOF_VOID_P <= 8
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#define ev_uintptr_t ev_uint64_t
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#define ev_intptr_t ev_int64_t
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#elif defined(_EVENT_IN_DOXYGEN)
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#define ev_uintptr_t ...
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#define ev_intptr_t ...
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#else
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#error "No way to define ev_uintptr_t"
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#endif
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#ifdef _EVENT_ssize_t
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#define ev_ssize_t _EVENT_ssize_t
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#else
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#define ev_ssize_t ssize_t
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#endif
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#ifdef WIN32
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#define ev_off_t ev_int64_t
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#else
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#define ev_off_t off_t
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#endif
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/**@}*/
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/* Limits for integer types.
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We're making two assumptions here:
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- The compiler does constant folding properly.
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- The platform does signed arithmetic in two's complement.
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*/
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/**
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@name Limits for integer types
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These macros hold the largest or smallest values possible for the
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ev_[u]int*_t types.
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@{
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*/
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#define EV_UINT64_MAX UINT64_MAX
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#define EV_INT64_MAX INT64_MAX
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#define EV_INT64_MIN INT64_MIN
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#define EV_UINT32_MAX UINT32_MAX
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#define EV_INT32_MAX INT32_MAX
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#define EV_INT32_MIN INT32_MIN
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#define EV_UINT16_MAX UINT16_MAX
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#define EV_INT16_MAX INT16_MAX
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#define EV_INT16_MIN INT16_MIN
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#define EV_UINT8_MAX UINT8_MAX
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#define EV_INT8_MAX INT8_MAX
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#define EV_INT8_MIN INT8_MIN
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/** @} */
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/**
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@name Limits for SIZE_T and SSIZE_T
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@{
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*/
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#define EV_SIZE_MAX SIZE_MAX
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#define EV_SSIZE_MAX SSIZE_MAX
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#define EV_SSIZE_MIN SSIZE_MIN
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/**@}*/
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#ifdef WIN32
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#define ev_socklen_t int
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#elif defined(_EVENT_socklen_t)
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#define ev_socklen_t _EVENT_socklen_t
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#else
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#define ev_socklen_t socklen_t
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#endif
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#ifdef _EVENT_HAVE_STRUCT_SOCKADDR_STORAGE___SS_FAMILY
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#if !defined(_EVENT_HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY) \
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&& !defined(ss_family)
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#define ss_family __ss_family
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#endif
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#endif
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/**
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* A type wide enough to hold the output of "socket()" or "accept()". On
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* Windows, this is an intptr_t; elsewhere, it is an int. */
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#ifdef WIN32
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#define evutil_socket_t intptr_t
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#else
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#define evutil_socket_t int
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#endif
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/** Create two new sockets that are connected to each other.
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On Unix, this simply calls socketpair(). On Windows, it uses the
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loopback network interface on 127.0.0.1, and only
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AF_INET,SOCK_STREAM are supported.
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(This may fail on some Windows hosts where firewall software has cleverly
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decided to keep 127.0.0.1 from talking to itself.)
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Parameters and return values are as for socketpair()
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*/
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int evutil_socketpair(int d, int type, int protocol, evutil_socket_t sv[2]);
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/** Do platform-specific operations as needed to make a socket nonblocking.
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@param sock The socket to make nonblocking
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@return 0 on success, -1 on failure
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*/
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int evutil_make_socket_nonblocking(evutil_socket_t sock);
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/** Do platform-specific operations to make a listener socket reusable.
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Specifically, we want to make sure that another program will be able
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to bind this address right after we've closed the listener.
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This differs from Windows's interpretation of "reusable", which
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allows multiple listeners to bind the same address at the same time.
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@param sock The socket to make reusable
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@return 0 on success, -1 on failure
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*/
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int evutil_make_listen_socket_reuseable(evutil_socket_t sock);
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/** Do platform-specific operations as needed to close a socket upon a
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successful execution of one of the exec*() functions.
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@param sock The socket to be closed
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@return 0 on success, -1 on failure
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*/
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int evutil_make_socket_closeonexec(evutil_socket_t sock);
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/** Do the platform-specific call needed to close a socket returned from
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socket() or accept().
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@param sock The socket to be closed
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@return 0 on success, -1 on failure
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*/
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int evutil_closesocket(evutil_socket_t sock);
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#define EVUTIL_CLOSESOCKET(s) evutil_closesocket(s)
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#ifdef WIN32
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/** Return the most recent socket error. Not idempotent on all platforms. */
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#define EVUTIL_SOCKET_ERROR() WSAGetLastError()
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/** Replace the most recent socket error with errcode */
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#define EVUTIL_SET_SOCKET_ERROR(errcode) \
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do { WSASetLastError(errcode); } while (/*CONSTCOND*/0)
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/** Return the most recent socket error to occur on sock. */
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int evutil_socket_geterror(evutil_socket_t sock);
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/** Convert a socket error to a string. */
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const char *evutil_socket_error_to_string(int errcode);
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#elif defined(_EVENT_IN_DOXYGEN)
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/**
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@name Socket error functions
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These functions are needed for making programs compatible between
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Windows and Unix-like platforms.
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You see, Winsock handles socket errors differently from the rest of
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the world. Elsewhere, a socket error is like any other error and is
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stored in errno. But winsock functions require you to retrieve the
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error with a special function, and don't let you use strerror for
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the error codes. And handling EWOULDBLOCK is ... different.
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@{
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*/
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/** Return the most recent socket error. Not idempotent on all platforms. */
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#define EVUTIL_SOCKET_ERROR() ...
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/** Replace the most recent socket error with errcode */
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#define EVUTIL_SET_SOCKET_ERROR(errcode) ...
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/** Return the most recent socket error to occur on sock. */
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#define evutil_socket_geterror(sock) ...
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/** Convert a socket error to a string. */
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#define evutil_socket_error_to_string(errcode) ...
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/**@}*/
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#else
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#define EVUTIL_SOCKET_ERROR() (errno)
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#define EVUTIL_SET_SOCKET_ERROR(errcode) \
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do { errno = (errcode); } while (/*CONSTCOND*/0)
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#define evutil_socket_geterror(sock) (errno)
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#define evutil_socket_error_to_string(errcode) (strerror(errcode))
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#endif
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/**
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* @name Manipulation macros for struct timeval.
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*
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* We define replacements
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* for timeradd, timersub, timerclear, timercmp, and timerisset.
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*
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* @{
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*/
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#ifdef _EVENT_HAVE_TIMERADD
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#define evutil_timeradd(tvp, uvp, vvp) timeradd((tvp), (uvp), (vvp))
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#define evutil_timersub(tvp, uvp, vvp) timersub((tvp), (uvp), (vvp))
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#else
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#define evutil_timeradd(tvp, uvp, vvp) \
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do { \
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(vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec; \
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(vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
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if ((vvp)->tv_usec >= 1000000) { \
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(vvp)->tv_sec++; \
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(vvp)->tv_usec -= 1000000; \
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} \
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} while (/*CONSTCOND*/0)
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#define evutil_timersub(tvp, uvp, vvp) \
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do { \
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(vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
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(vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
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if ((vvp)->tv_usec < 0) { \
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(vvp)->tv_sec--; \
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(vvp)->tv_usec += 1000000; \
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} \
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} while (/*CONSTCOND*/0)
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#endif /* !_EVENT_HAVE_HAVE_TIMERADD */
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#ifdef _EVENT_HAVE_TIMERCLEAR
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#define evutil_timerclear(tvp) timerclear(tvp)
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#else
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#define evutil_timerclear(tvp) (tvp)->tv_sec = (tvp)->tv_usec = 0
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#endif
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/**@}*/
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/** Return true iff the tvp is related to uvp according to the relational
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* operator cmp. Recognized values for cmp are ==, <=, <, >=, and >. */
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#define evutil_timercmp(tvp, uvp, cmp) \
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(((tvp)->tv_sec == (uvp)->tv_sec) ? \
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((tvp)->tv_usec cmp (uvp)->tv_usec) : \
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((tvp)->tv_sec cmp (uvp)->tv_sec))
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#ifdef _EVENT_HAVE_TIMERISSET
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#define evutil_timerisset(tvp) timerisset(tvp)
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#else
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#define evutil_timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
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#endif
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/** Replacement for offsetof on platforms that don't define it. */
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#ifdef offsetof
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#define evutil_offsetof(type, field) offsetof(type, field)
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#else
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#define evutil_offsetof(type, field) ((off_t)(&((type *)0)->field))
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#endif
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/* big-int related functions */
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/** Parse a 64-bit value from a string. Arguments are as for strtol. */
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ev_int64_t evutil_strtoll(const char *s, char **endptr, int base);
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/** Replacement for gettimeofday on platforms that lack it. */
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#ifdef _EVENT_HAVE_GETTIMEOFDAY
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#define evutil_gettimeofday(tv, tz) gettimeofday((tv), (tz))
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#else
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struct timezone;
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int evutil_gettimeofday(struct timeval *tv, struct timezone *tz);
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#endif
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/** Replacement for snprintf to get consistent behavior on platforms for
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which the return value of snprintf does not conform to C99.
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*/
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int evutil_snprintf(char *buf, size_t buflen, const char *format, ...)
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#ifdef __GNUC__
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__attribute__((format(printf, 3, 4)))
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#endif
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;
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/** Replacement for vsnprintf to get consistent behavior on platforms for
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which the return value of snprintf does not conform to C99.
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*/
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int evutil_vsnprintf(char *buf, size_t buflen, const char *format, va_list ap)
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#ifdef __GNUC__
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__attribute__((format(printf, 3, 0)))
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#endif
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;
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/** Replacement for inet_ntop for platforms which lack it. */
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const char *evutil_inet_ntop(int af, const void *src, char *dst, size_t len);
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/** Replacement for inet_pton for platforms which lack it. */
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int evutil_inet_pton(int af, const char *src, void *dst);
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struct sockaddr;
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/** Parse an IPv4 or IPv6 address, with optional port, from a string.
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Recognized formats are:
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- [IPv6Address]:port
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- [IPv6Address]
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- IPv6Address
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- IPv4Address:port
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- IPv4Address
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If no port is specified, the port in the output is set to 0.
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@param str The string to parse.
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@param out A struct sockaddr to hold the result. This should probably be
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a struct sockaddr_storage.
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@param outlen A pointer to the number of bytes that that 'out' can safely
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hold. Set to the number of bytes used in 'out' on success.
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@return -1 if the address is not well-formed, if the port is out of range,
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or if out is not large enough to hold the result. Otherwise returns
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0 on success.
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*/
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int evutil_parse_sockaddr_port(const char *str, struct sockaddr *out, int *outlen);
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/** Compare two sockaddrs; return 0 if they are equal, or less than 0 if sa1
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* preceeds sa2, or greater than 0 if sa1 follows sa2. If include_port is
|
|
* true, consider the port as well as the address. Only implemented for
|
|
* AF_INET and AF_INET6 addresses. The ordering is not guaranteed to remain
|
|
* the same between Libevent versions. */
|
|
int evutil_sockaddr_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2,
|
|
int include_port);
|
|
|
|
/** As strcasecmp, but always compares the characters in locale-independent
|
|
ASCII. That's useful if you're handling data in ASCII-based protocols.
|
|
*/
|
|
int evutil_ascii_strcasecmp(const char *str1, const char *str2);
|
|
/** As strncasecmp, but always compares the characters in locale-independent
|
|
ASCII. That's useful if you're handling data in ASCII-based protocols.
|
|
*/
|
|
int evutil_ascii_strncasecmp(const char *str1, const char *str2, size_t n);
|
|
|
|
/* Here we define evutil_addrinfo to the native addrinfo type, or redefine it
|
|
* if this system has no getaddrinfo(). */
|
|
#ifdef _EVENT_HAVE_STRUCT_ADDRINFO
|
|
#define evutil_addrinfo addrinfo
|
|
#else
|
|
/** A definition of struct addrinfo for systems that lack it.
|
|
|
|
(This is just an alias for struct addrinfo if the system defines
|
|
struct addrinfo.)
|
|
*/
|
|
struct evutil_addrinfo {
|
|
int ai_flags; /* AI_PASSIVE, AI_CANONNAME, AI_NUMERICHOST */
|
|
int ai_family; /* PF_xxx */
|
|
int ai_socktype; /* SOCK_xxx */
|
|
int ai_protocol; /* 0 or IPPROTO_xxx for IPv4 and IPv6 */
|
|
size_t ai_addrlen; /* length of ai_addr */
|
|
char *ai_canonname; /* canonical name for nodename */
|
|
struct sockaddr *ai_addr; /* binary address */
|
|
struct evutil_addrinfo *ai_next; /* next structure in linked list */
|
|
};
|
|
#endif
|
|
/** @name evutil_getaddrinfo() error codes
|
|
|
|
These values are possible error codes for evutil_getaddrinfo() and
|
|
related functions.
|
|
|
|
@{
|
|
*/
|
|
#ifdef EAI_ADDRFAMILY
|
|
#define EVUTIL_EAI_ADDRFAMILY EAI_ADDRFAMILY
|
|
#else
|
|
#define EVUTIL_EAI_ADDRFAMILY -901
|
|
#endif
|
|
#ifdef EAI_AGAIN
|
|
#define EVUTIL_EAI_AGAIN EAI_AGAIN
|
|
#else
|
|
#define EVUTIL_EAI_AGAIN -902
|
|
#endif
|
|
#ifdef EAI_BADFLAGS
|
|
#define EVUTIL_EAI_BADFLAGS EAI_BADFLAGS
|
|
#else
|
|
#define EVUTIL_EAI_BADFLAGS -903
|
|
#endif
|
|
#ifdef EAI_FAIL
|
|
#define EVUTIL_EAI_FAIL EAI_FAIL
|
|
#else
|
|
#define EVUTIL_EAI_FAIL -904
|
|
#endif
|
|
#ifdef EAI_FAMILY
|
|
#define EVUTIL_EAI_FAMILY EAI_FAMILY
|
|
#else
|
|
#define EVUTIL_EAI_FAMILY -905
|
|
#endif
|
|
#ifdef EAI_MEMORY
|
|
#define EVUTIL_EAI_MEMORY EAI_MEMORY
|
|
#else
|
|
#define EVUTIL_EAI_MEMORY -906
|
|
#endif
|
|
/* This test is a bit complicated, since some MS SDKs decide to
|
|
* remove NODATA or redefine it to be the same as NONAME, in a
|
|
* fun interpretation of RFC 2553 and RFC 3493. */
|
|
#if defined(EAI_NODATA) && (!defined(EAI_NONAME) || EAI_NODATA != EAI_NONAME)
|
|
#define EVUTIL_EAI_NODATA EAI_NODATA
|
|
#else
|
|
#define EVUTIL_EAI_NODATA -907
|
|
#endif
|
|
#ifdef EAI_NONAME
|
|
#define EVUTIL_EAI_NONAME EAI_NONAME
|
|
#else
|
|
#define EVUTIL_EAI_NONAME -908
|
|
#endif
|
|
#ifdef EAI_SERVICE
|
|
#define EVUTIL_EAI_SERVICE EAI_SERVICE
|
|
#else
|
|
#define EVUTIL_EAI_SERVICE -909
|
|
#endif
|
|
#ifdef EAI_SOCKTYPE
|
|
#define EVUTIL_EAI_SOCKTYPE EAI_SOCKTYPE
|
|
#else
|
|
#define EVUTIL_EAI_SOCKTYPE -910
|
|
#endif
|
|
#ifdef EAI_SYSTEM
|
|
#define EVUTIL_EAI_SYSTEM EAI_SYSTEM
|
|
#else
|
|
#define EVUTIL_EAI_SYSTEM -911
|
|
#endif
|
|
|
|
#define EVUTIL_EAI_CANCEL -90001
|
|
|
|
#ifdef AI_PASSIVE
|
|
#define EVUTIL_AI_PASSIVE AI_PASSIVE
|
|
#else
|
|
#define EVUTIL_AI_PASSIVE 0x1000
|
|
#endif
|
|
#ifdef AI_CANONNAME
|
|
#define EVUTIL_AI_CANONNAME AI_CANONNAME
|
|
#else
|
|
#define EVUTIL_AI_CANONNAME 0x2000
|
|
#endif
|
|
#ifdef AI_NUMERICHOST
|
|
#define EVUTIL_AI_NUMERICHOST AI_NUMERICHOST
|
|
#else
|
|
#define EVUTIL_AI_NUMERICHOST 0x4000
|
|
#endif
|
|
#ifdef AI_NUMERICSERV
|
|
#define EVUTIL_AI_NUMERICSERV AI_NUMERICSERV
|
|
#else
|
|
#define EVUTIL_AI_NUMERICSERV 0x8000
|
|
#endif
|
|
#ifdef AI_V4MAPPED
|
|
#define EVUTIL_AI_V4MAPPED AI_V4MAPPED
|
|
#else
|
|
#define EVUTIL_AI_V4MAPPED 0x10000
|
|
#endif
|
|
#ifdef AI_ALL
|
|
#define EVUTIL_AI_ALL AI_ALL
|
|
#else
|
|
#define EVUTIL_AI_ALL 0x20000
|
|
#endif
|
|
#ifdef AI_ADDRCONFIG
|
|
#define EVUTIL_AI_ADDRCONFIG AI_ADDRCONFIG
|
|
#else
|
|
#define EVUTIL_AI_ADDRCONFIG 0x40000
|
|
#endif
|
|
/**@}*/
|
|
|
|
struct evutil_addrinfo;
|
|
/**
|
|
* This function clones getaddrinfo for systems that don't have it. For full
|
|
* details, see RFC 3493, section 6.1.
|
|
*
|
|
* Limitations:
|
|
* - When the system has no getaddrinfo, we fall back to gethostbyname_r or
|
|
* gethostbyname, with their attendant issues.
|
|
* - The AI_V4MAPPED and AI_ALL flags are not currently implemented.
|
|
*
|
|
* For a nonblocking variant, see evdns_getaddrinfo.
|
|
*/
|
|
int evutil_getaddrinfo(const char *nodename, const char *servname,
|
|
const struct evutil_addrinfo *hints_in, struct evutil_addrinfo **res);
|
|
|
|
/** Release storage allocated by evutil_getaddrinfo or evdns_getaddrinfo. */
|
|
void evutil_freeaddrinfo(struct evutil_addrinfo *ai);
|
|
|
|
const char *evutil_gai_strerror(int err);
|
|
|
|
/** Generate n bytes of secure pseudorandom data, and store them in buf.
|
|
*
|
|
* By default, Libevent uses an ARC4-based random number generator, seeded
|
|
* using the platform's entropy source (/dev/urandom on Unix-like systems;
|
|
* CryptGenRandom on Windows).
|
|
*/
|
|
void evutil_secure_rng_get_bytes(void *buf, size_t n);
|
|
|
|
/**
|
|
* Seed the secure random number generator if needed, and return 0 on
|
|
* success or -1 on failure.
|
|
*
|
|
* It is okay to call this function more than once; it will still return
|
|
* 0 if the RNG has been successfully seeded and -1 if it can't be
|
|
* seeded.
|
|
*
|
|
* Ordinarily you don't need to call this function from your own code;
|
|
* Libevent will seed the RNG itself the first time it needs good random
|
|
* numbers. You only need to call it if (a) you want to double-check
|
|
* that one of the seeding methods did succeed, or (b) you plan to drop
|
|
* the capability to seed (by chrooting, or dropping capabilities, or
|
|
* whatever), and you want to make sure that seeding happens before your
|
|
* program loses the ability to do it.
|
|
*/
|
|
int evutil_secure_rng_init(void);
|
|
|
|
/** Seed the random number generator with extra random bytes.
|
|
|
|
You should almost never need to call this function; it should be
|
|
sufficient to invoke evutil_secure_rng_init(), or let Libevent take
|
|
care of calling evutil_secure_rng_init() on its own.
|
|
|
|
If you call this function as a _replacement_ for the regular
|
|
entropy sources, then you need to be sure that your input
|
|
contains a fairly large amount of strong entropy. Doing so is
|
|
notoriously hard: most people who try get it wrong. Watch out!
|
|
|
|
@param dat a buffer full of a strong source of random numbers
|
|
@param datlen the number of bytes to read from datlen
|
|
*/
|
|
void evutil_secure_rng_add_bytes(const char *dat, size_t datlen);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* _EVUTIL_H_ */
|