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haproxy/include/common/compat.h
Willy Tarreau 9a85a1700b MINOR: compat: define a new empty type empty_t for non-implemented fields 
Some structures have optional fields which depend on availability of
certain features on certain platforms, and having to stuff lots of
ifdefs in these structs makes them unreadable. Using real values like
ints requires some initialization and adds even more confusion.

Here we take a different approach : we create an empty type called
empty_t to use as a substitute for the real type that is not implemented
and which doesn't contain any value (it's an empty struct). Thus it has
a size of zero but an address, thus a pointer may point to it. It will
not have to be initialized though. Some initialization code might even
continue to work and do nothing like initializing it using memset with
its sizeof which is zero.
2019-05-21 20:03:03 +02:00

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/*
* include/common/compat.h
* Operating system compatibility interface.
*
* Copyright (C) 2000-2010 Willy Tarreau - w@1wt.eu
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, version 2.1
* exclusively.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _COMMON_COMPAT_H
#define _COMMON_COMPAT_H
#include <limits.h>
#include <time.h>
#include <unistd.h>
/* This is needed on Linux for Netfilter includes */
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
/* set any optional field in a struct to this type to save ifdefs. Its address
* will still be valid but it will not reserve any room nor require any
* initialization.
*/
typedef struct { } empty_t;
// Redefine some limits that are not present everywhere
#ifndef LLONG_MAX
# define LLONG_MAX 9223372036854775807LL
# define LLONG_MIN (-LLONG_MAX - 1LL)
#endif
#ifndef ULLONG_MAX
# define ULLONG_MAX (LLONG_MAX * 2ULL + 1)
#endif
#ifndef LONGBITS
#define LONGBITS ((unsigned int)sizeof(long) * 8)
#endif
#ifndef BITS_PER_INT
#define BITS_PER_INT (8*sizeof(int))
#endif
/* this is for libc5 for example */
#ifndef TCP_NODELAY
#define TCP_NODELAY 1
#endif
#ifndef SHUT_RD
#define SHUT_RD 0
#endif
#ifndef SHUT_WR
#define SHUT_WR 1
#endif
/* only Linux defines it */
#ifndef MSG_NOSIGNAL
#define MSG_NOSIGNAL 0
#endif
/* AIX does not define MSG_DONTWAIT. We'll define it to zero, and test it
* wherever appropriate.
*/
#ifndef MSG_DONTWAIT
#define MSG_DONTWAIT 0
#endif
/* Only Linux defines MSG_MORE */
#ifndef MSG_MORE
#define MSG_MORE 0
#endif
/* On Linux 2.4 and above, MSG_TRUNC can be used on TCP sockets to drop any
* pending data. Let's rely on NETFILTER to detect if this is supported.
*/
#ifdef NETFILTER
#define MSG_TRUNC_CLEARS_INPUT
#endif
/* Maximum path length, OS-dependant */
#ifndef MAXPATHLEN
#define MAXPATHLEN 128
#endif
/* On Linux, allows pipes to be resized */
#ifndef F_SETPIPE_SZ
#define F_SETPIPE_SZ (1024 + 7)
#endif
/* systems without such defines do not know clockid_t */
#if !(_POSIX_TIMERS > 0) || (_POSIX_C_SOURCE < 199309L)
#define clockid_t int
#undef CLOCK_REALTIME
#undef CLOCK_MONOTONIC
#undef CLOCK_THREAD_CPUTIME_ID
#define CLOCK_REALTIME 0
#define CLOCK_MONOTONIC 1
#define CLOCK_THREAD_CPUTIME_ID 2
#endif
#if defined(TPROXY) && defined(NETFILTER)
#include <linux/types.h>
#include <linux/netfilter_ipv6.h>
#include <linux/netfilter_ipv4.h>
#endif
/* On Linux, IP_TRANSPARENT and/or IP_FREEBIND generally require a kernel patch */
#if defined(CONFIG_HAP_LINUX_TPROXY)
#if !defined(IP_FREEBIND)
#define IP_FREEBIND 15
#endif /* !IP_FREEBIND */
#if !defined(IP_TRANSPARENT)
#define IP_TRANSPARENT 19
#endif /* !IP_TRANSPARENT */
#if !defined(IPV6_TRANSPARENT)
#define IPV6_TRANSPARENT 75
#endif /* !IPV6_TRANSPARENT */
#endif /* CONFIG_HAP_LINUX_TPROXY */
#if defined(IP_FREEBIND) \
|| defined(IP_BINDANY) \
|| defined(IPV6_BINDANY) \
|| defined(SO_BINDANY) \
|| defined(IP_TRANSPARENT) \
|| defined(IPV6_TRANSPARENT)
#define CONFIG_HAP_TRANSPARENT
#endif
/* We'll try to enable SO_REUSEPORT on Linux 2.4 and 2.6 if not defined.
* There are two families of values depending on the architecture. Those
* are at least valid on Linux 2.4 and 2.6, reason why we'll rely on the
* NETFILTER define.
*/
#if !defined(SO_REUSEPORT) && defined(NETFILTER)
#if (SO_REUSEADDR == 2)
#define SO_REUSEPORT 15
#elif (SO_REUSEADDR == 0x0004)
#define SO_REUSEPORT 0x0200
#endif /* SO_REUSEADDR */
#endif /* SO_REUSEPORT */
/* only Linux defines TCP_FASTOPEN */
#ifdef USE_TFO
#ifndef TCP_FASTOPEN
#define TCP_FASTOPEN 23
#endif
#ifndef TCP_FASTOPEN_CONNECT
#define TCP_FASTOPEN_CONNECT 30
#endif
#endif
/* FreeBSD doesn't define SOL_IP and prefers IPPROTO_IP */
#ifndef SOL_IP
#define SOL_IP IPPROTO_IP
#endif
/* same for SOL_TCP */
#ifndef SOL_TCP
#define SOL_TCP IPPROTO_TCP
#endif
/* If IPv6 is supported, define IN6_IS_ADDR_V4MAPPED() if missing. */
#if defined(IPV6_TCLASS) && !defined(IN6_IS_ADDR_V4MAPPED)
#define IN6_IS_ADDR_V4MAPPED(a) \
((((const uint32_t *) (a))[0] == 0) \
&& (((const uint32_t *) (a))[1] == 0) \
&& (((const uint32_t *) (a))[2] == htonl (0xffff)))
#endif
#if defined(__dietlibc__)
#include <strings.h>
#endif
/* crypt_r() has been present in glibc since 2.2 and on FreeBSD since 12.0
* (12000002). No other OS makes any mention of it for now. Feel free to add
* valid known combinations below if needed to relax the crypt() lock when
* using threads.
*/
#if (defined(__GNU_LIBRARY__) && (__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 2)) \
|| (defined(__FreeBSD__) && __FreeBSD_version >= 1200002)
#define HA_HAVE_CRYPT_R
#endif
#endif /* _COMMON_COMPAT_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
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