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