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/* $Id$ */

/* Copyright 1998 by the Massachusetts Institute of Technology.
*
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting
* documentation, and that the name of M.I.T. not be used in
* advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is"
* without express or implied warranty.
*/

#ifndef ARES__H
#define ARES__H

#include <sys/types.h>

#if defined(_AIX) || defined(NETWARE)
/* HP-UX systems version 9, 10 and 11 lack sys/select.h and so does oldish
libc5-based Linux systems. Only include it on system that are known to
require it! */
#include <sys/select.h>
#endif

#if defined(WATT32)
#include <netinet/in.h>
#include <tcp.h>
#elif defined(WIN32)
#include <winsock.h>
#include <windows.h>
#else
#include <netinet/in.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif

#define ARES_SUCCESS 0

/* Server error codes (ARES_ENODATA indicates no relevant answer) */
#define ARES_ENODATA 1
#define ARES_EFORMERR 2
#define ARES_ESERVFAIL 3
#define ARES_ENOTFOUND 4
#define ARES_ENOTIMP 5
#define ARES_EREFUSED 6

/* Locally generated error codes */
#define ARES_EBADQUERY 7
#define ARES_EBADNAME 8
#define ARES_EBADFAMILY 9
#define ARES_EBADRESP 10
#define ARES_ECONNREFUSED 11
#define ARES_ETIMEOUT 12
#define ARES_EOF 13
#define ARES_EFILE 14
#define ARES_ENOMEM 15
#define ARES_EDESTRUCTION 16
#define ARES_EBADSTR 17

/* Flag values */
#define ARES_FLAG_USEVC (1 << 0)
#define ARES_FLAG_PRIMARY (1 << 1)
#define ARES_FLAG_IGNTC (1 << 2)
#define ARES_FLAG_NORECURSE (1 << 3)
#define ARES_FLAG_STAYOPEN (1 << 4)
#define ARES_FLAG_NOSEARCH (1 << 5)
#define ARES_FLAG_NOALIASES (1 << 6)
#define ARES_FLAG_NOCHECKRESP (1 << 7)

/* Option mask values */
#define ARES_OPT_FLAGS (1 << 0)
#define ARES_OPT_TIMEOUT (1 << 1)
#define ARES_OPT_TRIES (1 << 2)
#define ARES_OPT_NDOTS (1 << 3)
#define ARES_OPT_UDP_PORT (1 << 4)
#define ARES_OPT_TCP_PORT (1 << 5)
#define ARES_OPT_SERVERS (1 << 6)
#define ARES_OPT_DOMAINS (1 << 7)
#define ARES_OPT_LOOKUPS (1 << 8)

struct ares_options {
  int flags;
  int timeout;
  int tries;
  int ndots;
  unsigned short udp_port;
  unsigned short tcp_port;
  struct in_addr *servers;
  int nservers;
  char **domains;
  int ndomains;
  char *lookups;
};

struct hostent;
struct timeval;
struct ares_channeldata;
typedef struct ares_channeldata *ares_channel;
typedef void (*ares_callback)(void *arg, int status, unsigned char *abuf,
                              int alen);
typedef void (*ares_host_callback)(void *arg, int status,
                                   struct hostent *hostent);

int ares_init(ares_channel *channelptr);
int ares_init_options(ares_channel *channelptr, struct ares_options *options,
                      int optmask);
void ares_destroy(ares_channel channel);
void ares_cancel(ares_channel channel);
void ares_send(ares_channel channel, const unsigned char *qbuf, int qlen,
               ares_callback callback, void *arg);
void ares_query(ares_channel channel, const char *name, int dnsclass,
                int type, ares_callback callback, void *arg);
void ares_search(ares_channel channel, const char *name, int dnsclass,
                 int type, ares_callback callback, void *arg);
void ares_gethostbyname(ares_channel channel, const char *name, int family,
                        ares_host_callback callback, void *arg);
void ares_gethostbyaddr(ares_channel channel, const void *addr, int addrlen,
                        int family, ares_host_callback callback, void *arg);

int ares_fds(ares_channel channel, fd_set *read_fds, fd_set *write_fds);
struct timeval *ares_timeout(ares_channel channel, struct timeval *maxtv,
                             struct timeval *tv);
void ares_process(ares_channel channel, fd_set *read_fds, fd_set *write_fds);

int ares_mkquery(const char *name, int dnsclass, int type, unsigned short id,
                 int rd, unsigned char **buf, int *buflen);
int ares_expand_name(const unsigned char *encoded, const unsigned char *abuf,
                     int alen, char **s, long *enclen);
int ares_expand_string(const unsigned char *encoded, const unsigned char *abuf,
                     int alen, unsigned char **s, long *enclen);
int ares_parse_a_reply(const unsigned char *abuf, int alen,
                       struct hostent **host);
int ares_parse_aaaa_reply(const unsigned char *abuf, int alen,
                       struct hostent **host);
int ares_parse_ptr_reply(const unsigned char *abuf, int alen, const void *addr,
                         int addrlen, int family, struct hostent **host);
void ares_free_string(void *str);
void ares_free_hostent(struct hostent *host);
const char *ares_strerror(int code);

#ifdef __cplusplus
}
#endif

#endif /* ARES__H */
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