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/* $Id: socket.h 8894 2010-01-17 13:04:04Z iulius $
**
** Portability wrapper around <sys/socket.h> and friends.
**
** This header file is the equivalent of:
**
** #include <arpa/inet.h>
** #include <netinet/in.h>
** #include <netdb.h>
** #include <sys/socket.h>
**
** but also cleans up various messes, mostly related to IPv6 support. It
** ensures that inet_aton, inet_ntoa, and inet_ntop are available and
** properly prototyped.
*/
#ifndef PORTABLE_SOCKET_H
#define PORTABLE_SOCKET_H 1
#include "config.h"
#include <errno.h>
#include <sys/types.h>
/* BSDI needs <netinet/in.h> before <arpa/inet.h>. */
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/socket.h>
/* Pick up definitions of getaddrinfo and getnameinfo if not otherwise
available. */
#include "portable/getaddrinfo.h"
#include "portable/getnameinfo.h"
BEGIN_DECLS
/* Provide prototypes for inet_aton and inet_ntoa if not prototyped in the
system header files since they're occasionally available without proper
prototypes. */
#if !HAVE_DECL_INET_ATON
extern int inet_aton(const char *, struct in_addr *);
#endif
#if !HAVE_DECL_INET_NTOA
extern const char * inet_ntoa(const struct in_addr);
#endif
#if !HAVE_INET_NTOP
extern const char * inet_ntop(int, const void *, char *, socklen_t);
#endif
/* Some systems don't define INADDR_LOOPBACK. */
#ifndef INADDR_LOOPBACK
# define INADDR_LOOPBACK 0x7f000001UL
#endif
/* Defined by RFC 3493, used to store a generic address. Note that this
doesn't do the alignment mangling that RFC 3493 does; it's not clear if
that should be added.... */
#if !HAVE_STRUCT_SOCKADDR_STORAGE
# if HAVE_STRUCT_SOCKADDR_SA_LEN
struct sockaddr_storage {
unsigned char ss_len;
unsigned char ss_family;
unsigned char __padding[128 - 2];
};
# else
struct sockaddr_storage {
unsigned short ss_family;
unsigned char __padding[128 - 2];
};
# endif
#endif
/* Use convenient, non-uglified names for the fields since we use them quite a
bit in code. */
#if HAVE_STRUCT_SOCKADDR_STORAGE && !HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY
# define ss_family __ss_family
# define ss_len __ss_len
#endif
/* Fix IN6_ARE_ADDR_EQUAL if required. */
#ifdef HAVE_BROKEN_IN6_ARE_ADDR_EQUAL
# undef IN6_ARE_ADDR_EQUAL
# define IN6_ARE_ADDR_EQUAL(a, b) \
(memcmp((a), (b), sizeof(struct in6_addr)) == 0)
#endif
/* Define an SA_LEN macro that gives us the length of a sockaddr. */
#if !HAVE_SA_LEN
# if HAVE_STRUCT_SOCKADDR_SA_LEN
# define SA_LEN(s) ((s)->sa_len)
# else
/* Hack courtesy of the USAGI project. */
# if HAVE_INET6
# define SA_LEN(s) \
((((const struct sockaddr *)(s))->sa_family == AF_INET6) \
? sizeof(struct sockaddr_in6) \
: ((((const struct sockaddr *)(s))->sa_family == AF_INET) \
? sizeof(struct sockaddr_in) \
: sizeof(struct sockaddr)))
# else
# define SA_LEN(s) \
((((const struct sockaddr *)(s))->sa_family == AF_INET) \
? sizeof(struct sockaddr_in) \
: sizeof(struct sockaddr))
# endif
# endif /* HAVE_SOCKADDR_LEN */
#endif /* !HAVE_SA_LEN_MACRO */
/* Make sure we have access to h_errno and hstrerror to print out name
resolution error messages. */
#if !HAVE_DECL_H_ERRNO
extern int h_errno;
#endif
#if !HAVE_HSTRERROR
extern const char *hstrerror(int);
#endif
/* The netdb constants, which aren't always defined (particularly if h_errno
isn't declared. We also make sure that a few of the less-used ones are
defined so that we can deal with them in case statements. */
#ifndef NETDB_SUCCESS
# define NETDB_SUCCESS 0
#endif
#ifndef HOST_NOT_FOUND
# define HOST_NOT_FOUND 1
# define TRY_AGAIN 2
# define NO_RECOVERY 3
# define NO_DATA 4
#endif
#ifndef NETDB_INTERNAL
# define NETDB_INTERNAL -1
#endif
/* AI_ADDRCONFIG results in an error from getaddrinfo on BSD/OS and
possibly other platforms. If configure determined it didn't work,
pretend it doesn't exist. */
#if !defined(HAVE_GETADDRINFO_ADDRCONFIG) && defined(AI_ADDRCONFIG)
# undef AI_ADDRCONFIG
#endif
/* POSIX requires AI_ADDRCONFIG and AI_NUMERICSERV, but some implementations
don't have them yet. It's only used in a bitwise OR of flags, so defining
them to 0 makes them harmlessly go away. */
#ifndef AI_ADDRCONFIG
# define AI_ADDRCONFIG 0
#endif
#ifndef AI_NUMERICSERV
# define AI_NUMERICSERV 0
#endif
/* Constants required by the IPv6 API. The buffer size required to hold any
nul-terminated text representation of the given address type. */
#ifndef INET_ADDRSTRLEN
# define INET_ADDRSTRLEN 16
#endif
#ifndef INET6_ADDRSTRLEN
# define INET6_ADDRSTRLEN 46
#endif
/* This is one of the defined error codes from inet_ntop, but it may not be
available on systems too old to have that function. */
#ifndef EAFNOSUPPORT
# define EAFNOSUPPORT EDOM
#endif
/* EAI_ADDRFAMILY was made obsolete by RFC 3493, but it may still be
* used by obsolete IPv6 stacks. */
#ifndef EAI_ADDRFAMILY
# define EAI_ADDRFAMILY EAI_FAMILY
#endif
END_DECLS
#endif /* PORTABLE_SOCKET_H */
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