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>
27 #include <netinet/in.h>
30 #define ARES_SUCCESS 0
32 /* Server error codes (ARES_ENODATA indicates no relevant answer) */
33 #define ARES_ENODATA 1
34 #define ARES_EFORMERR 2
35 #define ARES_ESERVFAIL 3
36 #define ARES_ENOTFOUND 4
37 #define ARES_ENOTIMP 5
38 #define ARES_EREFUSED 6
40 /* Locally generated error codes */
41 #define ARES_EBADQUERY 7
42 #define ARES_EBADNAME 8
43 #define ARES_EBADFAMILY 9
44 #define ARES_EBADRESP 10
45 #define ARES_ECONNREFUSED 11
46 #define ARES_ETIMEOUT 12
49 #define ARES_ENOMEM 15
50 #define ARES_EDESTRUCTION 16
53 #define ARES_FLAG_USEVC (1 << 0)
54 #define ARES_FLAG_PRIMARY (1 << 1)
55 #define ARES_FLAG_IGNTC (1 << 2)
56 #define ARES_FLAG_NORECURSE (1 << 3)
57 #define ARES_FLAG_STAYOPEN (1 << 4)
58 #define ARES_FLAG_NOSEARCH (1 << 5)
59 #define ARES_FLAG_NOALIASES (1 << 6)
60 #define ARES_FLAG_NOCHECKRESP (1 << 7)
62 /* Option mask values */
63 #define ARES_OPT_FLAGS (1 << 0)
64 #define ARES_OPT_TIMEOUT (1 << 1)
65 #define ARES_OPT_TRIES (1 << 2)
66 #define ARES_OPT_NDOTS (1 << 3)
67 #define ARES_OPT_UDP_PORT (1 << 4)
68 #define ARES_OPT_TCP_PORT (1 << 5)
69 #define ARES_OPT_SERVERS (1 << 6)
70 #define ARES_OPT_DOMAINS (1 << 7)
71 #define ARES_OPT_LOOKUPS (1 << 8)
78 unsigned short udp_port;
79 unsigned short tcp_port;
80 struct in_addr *servers;
89 struct ares_channeldata;
90 typedef struct ares_channeldata *ares_channel;
91 typedef void (*ares_callback)(void *arg, int status, unsigned char *abuf,
93 typedef void (*ares_host_callback)(void *arg, int status,
94 struct hostent *hostent);
96 int ares_init(ares_channel *channelptr);
97 int ares_init_options(ares_channel *channelptr, struct ares_options *options,
99 void ares_destroy(ares_channel channel);
101 void ares_send(ares_channel channel, const unsigned char *qbuf, int qlen,
102 ares_callback callback, void *arg);
103 void ares_query(ares_channel channel, const char *name, int dnsclass,
104 int type, ares_callback callback, void *arg);
105 void ares_search(ares_channel channel, const char *name, int dnsclass,
106 int type, ares_callback callback, void *arg);
107 void ares_gethostbyname(ares_channel channel, const char *name, int family,
108 ares_host_callback callback, void *arg);
109 void ares_gethostbyaddr(ares_channel channel, const void *addr, int addrlen,
110 int family, ares_host_callback callback, void *arg);
112 int ares_fds(ares_channel channel, fd_set *read_fds, fd_set *write_fds);
113 struct timeval *ares_timeout(ares_channel channel, struct timeval *maxtv,
115 void ares_process(ares_channel channel, fd_set *read_fds, fd_set *write_fds);
117 int ares_mkquery(const char *name, int dnsclass, int type, unsigned short id,
118 int rd, unsigned char **buf, int *buflen);
119 int ares_expand_name(const unsigned char *encoded, const unsigned char *abuf,
120 int alen, char **s, int *enclen);
121 int ares_parse_a_reply(const unsigned char *abuf, int alen,
122 struct hostent **host);
123 int ares_parse_ptr_reply(const unsigned char *abuf, int alen, const void *addr,
124 int addrlen, int family, struct hostent **host);
125 void ares_free_string(char *str);
126 void ares_free_hostent(struct hostent *host);
127 const char *ares_strerror(int code);
128 void ares_free_errmem(char *mem);