1 /* $OpenBSD: asr.h,v 1.2 2019/10/24 05:57:41 otto Exp $ */ 2 /* 3 * Copyright (c) 2012-2014 Eric Faurot <eric@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 /* 19 * Expected fd conditions 20 */ 21 #define ASR_WANT_READ 1 22 #define ASR_WANT_WRITE 2 23 24 /* 25 * Structure through which asynchronous query results are returned when 26 * calling asr_run(). 27 */ 28 struct asr_result { 29 /* Fields set if the query is not done yet (asr_run returns 0) */ 30 int ar_cond; /* ASR_WANT_READ or ASR_WANT_WRITE */ 31 int ar_fd; /* the fd waiting for io condition */ 32 int ar_timeout; /* time to wait for in milliseconds */ 33 34 /* Error fields. Depends on the query type. */ 35 int ar_errno; 36 int ar_h_errno; 37 int ar_gai_errno; 38 int ar_rrset_errno; 39 40 /* Result for res_*_async() calls */ 41 int ar_count; /* number of answers in the dns reply */ 42 int ar_rcode; /* response code in the dns reply */ 43 void *ar_data; /* raw reply packet (must be freed) */ 44 int ar_datalen; /* reply packet length */ 45 struct sockaddr_storage ar_ns; /* nameserver that responded */ 46 47 /* Result for other calls. Must be freed properly. */ 48 struct addrinfo *ar_addrinfo; 49 struct rrsetinfo *ar_rrsetinfo; 50 struct hostent *ar_hostent; 51 struct netent *ar_netent; 52 }; 53 54 /* 55 * Asynchronous query management. 56 */ 57 58 /* Forward declaration. The API uses opaque pointers as query handles. */ 59 struct asr_query; 60 61 void *asr_resolver_from_string(const char *); 62 void asr_resolver_free(void *); 63 int asr_run(struct asr_query *, struct asr_result *); 64 int asr_run_sync(struct asr_query *, struct asr_result *); 65 void asr_abort(struct asr_query *); 66 67 /* 68 * Asynchronous version of the resolver functions. Similar prototypes, with 69 * an extra context parameter at the end which must currently be set to NULL. 70 * All functions return a handle suitable for use with the management functions 71 * above. 72 */ 73 struct asr_query *res_send_async(const unsigned char *, int, void *); 74 struct asr_query *res_query_async(const char *, int, int, void *); 75 struct asr_query *res_search_async(const char *, int, int, void *); 76 77 struct asr_query *getrrsetbyname_async(const char *, unsigned int, unsigned int, 78 unsigned int, void *); 79 80 struct asr_query *gethostbyname_async(const char *, void *); 81 struct asr_query *gethostbyname2_async(const char *, int, void *); 82 struct asr_query *gethostbyaddr_async(const void *, socklen_t, int, void *); 83 84 struct asr_query *getnetbyname_async(const char *, void *); 85 struct asr_query *getnetbyaddr_async(in_addr_t, int, void *); 86 87 struct asr_query *getaddrinfo_async(const char *, const char *, 88 const struct addrinfo *, void *); 89 struct asr_query *getnameinfo_async(const struct sockaddr *, socklen_t, char *, 90 size_t, char *, size_t, int, void *); 91