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/* $OpenBSD: asr.h,v 1.2 2019/10/24 05:57:41 otto Exp $ */
/*
* Copyright (c) 2012-2014 Eric Faurot <eric@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Expected fd conditions
*/
#define ASR_WANT_READ 1
#define ASR_WANT_WRITE 2
/*
* Structure through which asynchronous query results are returned when
* calling asr_run().
*/
struct asr_result {
/* Fields set if the query is not done yet (asr_run returns 0) */
int ar_cond; /* ASR_WANT_READ or ASR_WANT_WRITE */
int ar_fd; /* the fd waiting for io condition */
int ar_timeout; /* time to wait for in milliseconds */
/* Error fields. Depends on the query type. */
int ar_errno;
int ar_h_errno;
int ar_gai_errno;
int ar_rrset_errno;
/* Result for res_*_async() calls */
int ar_count; /* number of answers in the dns reply */
int ar_rcode; /* response code in the dns reply */
void *ar_data; /* raw reply packet (must be freed) */
int ar_datalen; /* reply packet length */
struct sockaddr_storage ar_ns; /* nameserver that responded */
/* Result for other calls. Must be freed properly. */
struct addrinfo *ar_addrinfo;
struct rrsetinfo *ar_rrsetinfo;
struct hostent *ar_hostent;
struct netent *ar_netent;
};
/*
* Asynchronous query management.
*/
/* Forward declaration. The API uses opaque pointers as query handles. */
struct asr_query;
void *asr_resolver_from_string(const char *);
void asr_resolver_free(void *);
int asr_run(struct asr_query *, struct asr_result *);
int asr_run_sync(struct asr_query *, struct asr_result *);
void asr_abort(struct asr_query *);
/*
* Asynchronous version of the resolver functions. Similar prototypes, with
* an extra context parameter at the end which must currently be set to NULL.
* All functions return a handle suitable for use with the management functions
* above.
*/
struct asr_query *res_send_async(const unsigned char *, int, void *);
struct asr_query *res_query_async(const char *, int, int, void *);
struct asr_query *res_search_async(const char *, int, int, void *);
struct asr_query *getrrsetbyname_async(const char *, unsigned int, unsigned int,
unsigned int, void *);
struct asr_query *gethostbyname_async(const char *, void *);
struct asr_query *gethostbyname2_async(const char *, int, void *);
struct asr_query *gethostbyaddr_async(const void *, socklen_t, int, void *);
struct asr_query *getnetbyname_async(const char *, void *);
struct asr_query *getnetbyaddr_async(in_addr_t, int, void *);
struct asr_query *getaddrinfo_async(const char *, const char *,
const struct addrinfo *, void *);
struct asr_query *getnameinfo_async(const struct sockaddr *, socklen_t, char *,
size_t, char *, size_t, int, void *);
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