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 #ifdef HAVE_SYS_SELECT_H
24 #include <sys/select.h>
31 #include <netinet/in.h>
34 #define ARES_SUCCESS 0
36 /* Server error codes (ARES_ENODATA indicates no relevant answer) */
37 #define ARES_ENODATA 1
38 #define ARES_EFORMERR 2
39 #define ARES_ESERVFAIL 3
40 #define ARES_ENOTFOUND 4
41 #define ARES_ENOTIMP 5
42 #define ARES_EREFUSED 6
44 /* Locally generated error codes */
45 #define ARES_EBADQUERY 7
46 #define ARES_EBADNAME 8
47 #define ARES_EBADFAMILY 9
48 #define ARES_EBADRESP 10
49 #define ARES_ECONNREFUSED 11
50 #define ARES_ETIMEOUT 12
53 #define ARES_ENOMEM 15
54 #define ARES_EDESTRUCTION 16
57 #define ARES_FLAG_USEVC (1 << 0)
58 #define ARES_FLAG_PRIMARY (1 << 1)
59 #define ARES_FLAG_IGNTC (1 << 2)
60 #define ARES_FLAG_NORECURSE (1 << 3)
61 #define ARES_FLAG_STAYOPEN (1 << 4)
62 #define ARES_FLAG_NOSEARCH (1 << 5)
63 #define ARES_FLAG_NOALIASES (1 << 6)
64 #define ARES_FLAG_NOCHECKRESP (1 << 7)
66 /* Option mask values */
67 #define ARES_OPT_FLAGS (1 << 0)
68 #define ARES_OPT_TIMEOUT (1 << 1)
69 #define ARES_OPT_TRIES (1 << 2)
70 #define ARES_OPT_NDOTS (1 << 3)
71 #define ARES_OPT_UDP_PORT (1 << 4)
72 #define ARES_OPT_TCP_PORT (1 << 5)
73 #define ARES_OPT_SERVERS (1 << 6)
74 #define ARES_OPT_DOMAINS (1 << 7)
75 #define ARES_OPT_LOOKUPS (1 << 8)
82 unsigned short udp_port;
83 unsigned short tcp_port;
84 struct in_addr *servers;
93 struct ares_channeldata;
94 typedef struct ares_channeldata *ares_channel;
95 typedef void (*ares_callback)(void *arg, int status, unsigned char *abuf,
97 typedef void (*ares_host_callback)(void *arg, int status,
98 struct hostent *hostent);
100 int ares_init(ares_channel *channelptr);
101 int ares_init_options(ares_channel *channelptr, struct ares_options *options,
103 void ares_destroy(ares_channel channel);
105 void ares_send(ares_channel channel, const unsigned char *qbuf, int qlen,
106 ares_callback callback, void *arg);
107 void ares_query(ares_channel channel, const char *name, int dnsclass,
108 int type, ares_callback callback, void *arg);
109 void ares_search(ares_channel channel, const char *name, int dnsclass,
110 int type, ares_callback callback, void *arg);
111 void ares_gethostbyname(ares_channel channel, const char *name, int family,
112 ares_host_callback callback, void *arg);
113 void ares_gethostbyaddr(ares_channel channel, const void *addr, int addrlen,
114 int family, ares_host_callback callback, void *arg);
116 int ares_fds(ares_channel channel, fd_set *read_fds, fd_set *write_fds);
117 struct timeval *ares_timeout(ares_channel channel, struct timeval *maxtv,
119 void ares_process(ares_channel channel, fd_set *read_fds, fd_set *write_fds);
121 int ares_mkquery(const char *name, int dnsclass, int type, unsigned short id,
122 int rd, unsigned char **buf, int *buflen);
123 int ares_expand_name(const unsigned char *encoded, const unsigned char *abuf,
124 int alen, char **s, long *enclen);
125 int ares_parse_a_reply(const unsigned char *abuf, int alen,
126 struct hostent **host);
127 int ares_parse_ptr_reply(const unsigned char *abuf, int alen, const void *addr,
128 int addrlen, int family, struct hostent **host);
129 void ares_free_string(void *str);
130 void ares_free_hostent(struct hostent *host);
131 const char *ares_strerror(int code);
132 void ares_free_errmem(char *mem);