3 /* Copyright 1998 by the Massachusetts Institute of Technology.
5 * Permission to use, copy, modify, and distribute this
6 * software and its documentation for any purpose and without
7 * fee is hereby granted, provided that the above copyright
8 * notice appear in all copies and that both that copyright
9 * notice and this permission notice appear in supporting
10 * documentation, and that the name of M.I.T. not be used in
11 * advertising or publicity pertaining to distribution of the
12 * software without specific, written prior permission.
13 * M.I.T. makes no representations about the suitability of
14 * this software for any purpose. It is provided "as is"
15 * without express or implied warranty.
21 #include <sys/types.h>
23 #if defined(_AIX) || defined(NETWARE)
24 /* HP-UX systems version 9, 10 and 11 lack sys/select.h and so does oldish
25 libc5-based Linux systems. Only include it on system that are known to
27 #include <sys/select.h>
31 #include <netinet/in.h>
37 #include <netinet/in.h>
44 #define ARES_SUCCESS 0
46 /* Server error codes (ARES_ENODATA indicates no relevant answer) */
47 #define ARES_ENODATA 1
48 #define ARES_EFORMERR 2
49 #define ARES_ESERVFAIL 3
50 #define ARES_ENOTFOUND 4
51 #define ARES_ENOTIMP 5
52 #define ARES_EREFUSED 6
54 /* Locally generated error codes */
55 #define ARES_EBADQUERY 7
56 #define ARES_EBADNAME 8
57 #define ARES_EBADFAMILY 9
58 #define ARES_EBADRESP 10
59 #define ARES_ECONNREFUSED 11
60 #define ARES_ETIMEOUT 12
63 #define ARES_ENOMEM 15
64 #define ARES_EDESTRUCTION 16
65 #define ARES_EBADSTR 17
68 #define ARES_FLAG_USEVC (1 << 0)
69 #define ARES_FLAG_PRIMARY (1 << 1)
70 #define ARES_FLAG_IGNTC (1 << 2)
71 #define ARES_FLAG_NORECURSE (1 << 3)
72 #define ARES_FLAG_STAYOPEN (1 << 4)
73 #define ARES_FLAG_NOSEARCH (1 << 5)
74 #define ARES_FLAG_NOALIASES (1 << 6)
75 #define ARES_FLAG_NOCHECKRESP (1 << 7)
77 /* Option mask values */
78 #define ARES_OPT_FLAGS (1 << 0)
79 #define ARES_OPT_TIMEOUT (1 << 1)
80 #define ARES_OPT_TRIES (1 << 2)
81 #define ARES_OPT_NDOTS (1 << 3)
82 #define ARES_OPT_UDP_PORT (1 << 4)
83 #define ARES_OPT_TCP_PORT (1 << 5)
84 #define ARES_OPT_SERVERS (1 << 6)
85 #define ARES_OPT_DOMAINS (1 << 7)
86 #define ARES_OPT_LOOKUPS (1 << 8)
93 unsigned short udp_port;
94 unsigned short tcp_port;
95 struct in_addr *servers;
104 struct ares_channeldata;
105 typedef struct ares_channeldata *ares_channel;
106 typedef void (*ares_callback)(void *arg, int status, unsigned char *abuf,
108 typedef void (*ares_host_callback)(void *arg, int status,
109 struct hostent *hostent);
111 int ares_init(ares_channel *channelptr);
112 int ares_init_options(ares_channel *channelptr, struct ares_options *options,
114 void ares_destroy(ares_channel channel);
115 void ares_cancel(ares_channel channel);
116 void ares_send(ares_channel channel, const unsigned char *qbuf, int qlen,
117 ares_callback callback, void *arg);
118 void ares_query(ares_channel channel, const char *name, int dnsclass,
119 int type, ares_callback callback, void *arg);
120 void ares_search(ares_channel channel, const char *name, int dnsclass,
121 int type, ares_callback callback, void *arg);
122 void ares_gethostbyname(ares_channel channel, const char *name, int family,
123 ares_host_callback callback, void *arg);
124 void ares_gethostbyaddr(ares_channel channel, const void *addr, int addrlen,
125 int family, ares_host_callback callback, void *arg);
127 int ares_fds(ares_channel channel, fd_set *read_fds, fd_set *write_fds);
128 struct timeval *ares_timeout(ares_channel channel, struct timeval *maxtv,
130 void ares_process(ares_channel channel, fd_set *read_fds, fd_set *write_fds);
132 int ares_mkquery(const char *name, int dnsclass, int type, unsigned short id,
133 int rd, unsigned char **buf, int *buflen);
134 int ares_expand_name(const unsigned char *encoded, const unsigned char *abuf,
135 int alen, char **s, long *enclen);
136 int ares_expand_string(const unsigned char *encoded, const unsigned char *abuf,
137 int alen, unsigned char **s, long *enclen);
138 int ares_parse_a_reply(const unsigned char *abuf, int alen,
139 struct hostent **host);
140 int ares_parse_aaaa_reply(const unsigned char *abuf, int alen,
141 struct hostent **host);
142 int ares_parse_ptr_reply(const unsigned char *abuf, int alen, const void *addr,
143 int addrlen, int family, struct hostent **host);
144 void ares_free_string(void *str);
145 void ares_free_hostent(struct hostent *host);
146 const char *ares_strerror(int code);