authd/dns.h

   1 /* authd/dns.h - header for authd DNS functions
   2  * Copyright (c) 2016 Ariadne Conill <ariadne@dereferenced.org>
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice is present in all copies.
   7  *
   8  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   9  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  10  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  11  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  12  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  13  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  14  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  15  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  16  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  17  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  18  * POSSIBILITY OF SUCH DAMAGE.
  19  */
  20
  21 #ifndef _AUTHD_DNS_H
  22 #define _AUTHD_DNS_H
  23
  24 #define DNS_REQ_IDLEN 10
  25
  26 #include "stdinc.h"
  27 #include "res.h"
  28 #include "reslib.h"
  29
  30 typedef enum
  31 {
  32         QUERY_INVALID = 0,
  33         QUERY_A = '4',
  34         QUERY_AAAA = '6',
  35         QUERY_PTR_A = 'R',
  36         QUERY_PTR_AAAA = 'S',
  37 } query_type;
  38
  39 /* Similar to that in ircd */
  40 typedef void (*DNSCB)(const char *res, bool status, query_type type, void *data);
  41
  42 struct dns_query
  43 {
  44         struct DNSQuery query;
  45         query_type type;
  46         struct rb_sockaddr_storage addr;
  47         uint64_t id;
  48
  49         DNSCB callback;
  50         void *data;
  51 };
  52
  53 extern struct dns_query *lookup_hostname(const char *ip, DNSCB callback, void *data);
  54 extern struct dns_query *lookup_ip(const char *host, int aftype, DNSCB callback, void *data);
  55 extern void cancel_query(struct dns_query *query);
  56
  57 extern void handle_resolve_dns(int parc, char *parv[]);
  58 extern void enumerate_nameservers(uint32_t rid, const char letter);
  59 extern void reload_nameservers(const char letter);
  60
  61 #endif