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nuttx/include/netdb.h
YAMAMOTO Takashi 33005897ba netdb.h: Add NI_MAXHOST and NI_MAXSERV 
* These are not parts of the standards as far as I know.
* These are provided by many platforms. (GLIBC, BSD, Windows, etc)
* These are convenient.
2021-02-19 09:34:09 -08:00

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/****************************************************************************
* include/netdb.h
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
#ifndef __INCLUDE_NETDB_H
#define __INCLUDE_NETDB_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/compiler.h>
/* Inclusion of the <netdb.h> header may also make visible all symbols from
* <netinet/in.h>, <sys/socket.h>, and <inttypes.h>.
*/
#include <inttypes.h>
#include <netinet/in.h>
#include <sys/socket.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* The <netdb.h> header shall define the IPPORT_RESERVED macro with the
* value of the highest reserved Internet port number.
*/
#define IPPORT_RESERVED 0xffff /* No reserved port numbers */
/* The <netdb.h> header shall define the following macros that evaluate to
* bitwise-distinct integer constants for use in the flags field of the
* addrinfo structure:
*
* AI_PASSIVE - Socket address is intended for bind().
* AI_CANONNAME - Request for canonical name.
* AI_NUMERICHOST - Return numeric host address as name.
* AI_NUMERICSERV - Inhibit service name resolution.
* AI_V4MAPPED - If no IPv6 addresses are found, query for IPv4
* addresses and return them to the caller as IPv4-mapped
* IPv6 addresses.
* AI_ALL - Query for both IPv4 and IPv6 addresses.
* AI_ADDRCONFIG - Query for IPv4 addresses only when an IPv4 address is
* configured; query for IPv6 addresses only when an IPv6
* address is configured.
*/
#define AI_PASSIVE (1 << 0)
#define AI_CANONNAME (1 << 1)
#define AI_NUMERICHOST (1 << 2)
#define AI_NUMERICSERV (1 << 3)
#define AI_V4MAPPED (1 << 4)
#define AI_ALL (1 << 5)
#define AI_ADDRCONFIG (1 << 6)
/* The <netdb.h> header shall define the following macros that evaluate to
* bitwise-distinct integer constants for use in the flags argument to
* getnameinfo():
*
* NI_NOFQDN - Only the nodename portion of the FQDN is returned for
* local hosts.
* NI_NUMERICHOST - The numeric form of the node's address is returned
* instead of its name.
* NI_NAMEREQD - Return an error if the node's name cannot be located
* in the database.
* NI_NUMERICSERV - The numeric form of the service address is returned
* instead of its name.
* NI_NUMERICSCOPE - For IPv6 addresses, the numeric form of the scope
* identifier is returned instead of its name.
* NI_DGRAM - Indicates that the service is a datagram service
* (SOCK_DGRAM).
*/
#define NI_NOFQDN (1 << 0)
#define NI_NUMERICHOST (1 << 1)
#define NI_NAMEREQD (1 << 2)
#define NI_NUMERICSERV (1 << 3)
#define NI_NUMERICSCOPE (1 << 4)
#define NI_DGRAM (1 << 5)
/* Address Information Errors. The <netdb.h> header shall define the
* following macros for use as error values for getaddrinfo() and
* getnameinfo():
*
* EAI_AGAIN - The name could not be resolved at this time. Future
* attempts may succeed.
* EAI_BADFLAGS - The flags had an invalid value.
* EAI_FAIL - A non-recoverable error occurred.
* EAI_FAMILY - The address family was not recognized or the address
* length was invalid for the specified family.
* EAI_MEMORY - There was a memory allocation failure.
* EAI_NONAME - The name does not resolve for the supplied
* parameters. NI_NAMEREQD is set and the host's name
* cannot be located, or both nodename and servname were
* null.
* EAI_SERVICE - The service passed was not recognized for the
* specified socket type.
* EAI_SOCKTYPE - The intended socket type was not recognized.
* EAI_SYSTEM - A system error occurred. The error code can be found
* in errno.
* EAI_OVERFLOW - An argument buffer overflowed.
*/
#define EAI_AGAIN 1
#define EAI_BADFLAGS 2
#define EAI_FAIL 3
#define EAI_FAMILY 4
#define EAI_MEMORY 5
#define EAI_NONAME 6
#define EAI_SERVICE 7
#define EAI_SOCKTYPE 8
#define EAI_SYSTEM 9
#define EAI_OVERFLOW 10
/* h_errno values that may be returned by gethosbyname(), gethostbyname_r(),
* gethostbyaddr(), or gethostbyaddr_r()
*
* HOST_NOT_FOUND - No such host is known.
*
* NO_DATA - The server recognized the request and the name, but no
* address is available. Another type of request to the name server
* for the domain might return an answer.
*
* NO_RECOVERY - An unexpected server failure occurred which cannot be
* recovered.
*
* TRY_AGAIN - A temporary and possibly transient error occurred, such as
* a failure of a server to respond.
*
* These are obsolete and were removed in the Open Group Base Specifications
* Issue 7, 2018 edition.
*/
#define HOST_NOT_FOUND 1
#define NO_DATA 2
#define NO_ADDRESS NO_DATA
#define NO_RECOVERY 3
#define TRY_AGAIN 4
/* NI_MAXHOST is the max of
*
* CONFIG_NETDB_DNSCLIENT_NAMESIZE + 1
* INET6_ADDRSTRLEN
* INET_ADDRSTRLEN
*
* Note: INETxxx_ADDRSTRLEN already includes the terminating NUL.
* Note: INET6_ADDRSTRLEN > INET_ADDRSTRLEN is assumed.
*/
#if defined(CONFIG_NET_IPv6)
#define _INET_ADDRSTRLEN INET6_ADDRSTRLEN
#else
#define _INET_ADDRSTRLEN INET_ADDRSTRLEN
#endif
#if defined(CONFIG_NETDB_DNSCLIENT) && \
(CONFIG_NETDB_DNSCLIENT_NAMESIZE + 1) > _INET_ADDRSTRLEN
#define NI_MAXHOST (CONFIG_NETDB_DNSCLIENT_NAMESIZE + 1)
#else
#define NI_MAXHOST _INET_ADDRSTRLEN
#endif
/* Right now, g_services_db[] only has "ntp".
* 16 should be large enough.
*/
#define NI_MAXSERV 16
/****************************************************************************
* Public Types
****************************************************************************/
struct hostent
{
FAR char *h_name; /* Official name of the host. */
FAR char **h_aliases; /* A pointer to an array of pointers to the
* alternative host names, terminated by a
* null pointer. */
int h_addrtype; /* Address type. */
int h_length; /* The length, in bytes, of the address. */
FAR char **h_addr_list; /* A pointer to an array of pointers to network
* addresses (in network byte order) for the host,
* terminated by a null pointer. */
};
#define h_addr h_addr_list[0] /* For backward compatibility */
struct netent
{
FAR char *n_name; /* Official, fully-qualified(including the domain)
* name of the host. */
FAR char **n_aliases; /* A pointer to an array of pointers to the
* alternative network names, terminated by a
* null pointer. */
int n_addrtype; /* The address type of the network. */
uint32_t n_net; /* The network number, in host byte order. */
};
struct protoent
{
FAR char *p_name; /* Official name of the protocol. */
FAR char **p_aliases; /* A pointer to an array of pointers to
* alternative protocol names, terminated by a
* null pointer. */
int p_proto; /* The protocol number. */
};
struct servent
{
FAR char *s_name; /* Official name of the service. */
FAR char **s_aliases; /* A pointer to an array of pointers to
* alternative service names, terminated by a
* null pointer. */
int s_port; /* The port number at which the service resides,
* in network byte order. */
FAR char *s_proto; /* The name of the protocol to use when
* contacting the service. */
};
struct addrinfo
{
int ai_flags; /* Input flags. */
int ai_family; /* Address family of socket. */
int ai_socktype; /* Socket type. */
int ai_protocol; /* Protocol of socket. */
socklen_t ai_addrlen; /* Length of socket address. */
FAR struct sockaddr *ai_addr; /* Socket address of socket. */
FAR char *ai_canonname; /* Canonical name of service location. */
FAR struct addrinfo *ai_next; /* Pointer to next in list. */
};
/****************************************************************************
* Public Data
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/* When the <netdb.h> header is included, h_errno shall be available as a
* modifiable lvalue of type int. It is unspecified whether h_errno is a
* macro or an identifier declared with external linkage.
*
* h_errno is obsolete and was removed in the Open Group Base Specifications
* Issue 7, 2018 edition.
*/
/* REVISIT: This should at least be per-task? */
EXTERN int h_errno;
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifdef CONFIG_LIBC_NETDB
#if 0 /* None of these are yet supported */
void endhostent(void);
void endnetent(void);
void endprotoent(void);
void endservent(void);
#endif
void freeaddrinfo(FAR struct addrinfo *ai);
FAR const char *gai_strerror(int);
int getaddrinfo(FAR const char *nodename,
FAR const char *servname,
FAR const struct addrinfo *hints,
FAR struct addrinfo **res);
int getnameinfo(FAR const struct sockaddr *sa,
socklen_t salen, FAR char *node,
socklen_t nodelen, FAR char *service,
socklen_t servicelen, int flags);
FAR struct hostent *gethostbyaddr(FAR const void *addr, socklen_t len,
int type);
FAR struct hostent *gethostbyname(FAR const char *name);
FAR struct hostent *gethostbyname2(FAR const char *name, int type);
FAR struct servent *getservbyport(int port, FAR const char *proto);
FAR struct servent *getservbyname(FAR const char *name,
FAR const char *proto);
#if 0 /* None of these are yet supported */
FAR struct hostent *gethostent(void);
FAR struct netent *getnetbyaddr(uint32_t net, int type);
FAR struct netent *getnetbyname(FAR const char *name);
FAR struct netent *getnetent(void);
FAR struct protoent *getprotobyname(FAR const char *name);
FAR struct protoent *getprotobynumber(int proto);
FAR struct protoent *getprotoent(void);
FAR struct servent *getservent(void);
void sethostent(int);
void setnetent(int stayopen);
void setprotoent(int stayopen);
void setservent(int);
#endif /* None of these are yet supported */
/* Non-standard interfaces similar to Glibc 2 interfaces */
int gethostbyaddr_r(FAR const void *addr, socklen_t len, int type,
FAR struct hostent *host, FAR char *buf,
size_t buflen, FAR struct hostent **result,
FAR int *h_errnop);
int gethostbyname_r(FAR const char *name,
FAR struct hostent *host, FAR char *buf,
size_t buflen, FAR struct hostent **result,
FAR int *h_errnop);
int gethostbyname2_r(FAR const char *name, int type,
FAR struct hostent *host, FAR char *buf,
size_t buflen, FAR struct hostent **result,
FAR int *h_errnop);
int getservbyport_r(int port, FAR const char *proto,
FAR struct servent *result_buf, FAR char *buf,
size_t buflen, FAR struct servent **result);
int getservbyname_r(FAR const char *name, FAR const char *proto,
FAR struct servent *result_buf, FAR char *buf,
size_t buflen, FAR struct servent **result);
#endif /* CONFIG_LIBC_NETDB */
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __INCLUDE_NETDB_H */
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