2 /* Copyright 1998 by the Massachusetts Institute of Technology.
3 * Copyright (C) 2007-2013 by Daniel Stenberg
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 "ares_version.h" /* c-ares version defines */
22 #include "ares_build.h" /* c-ares build definitions */
23 #include "ares_rules.h" /* c-ares rules enforcement */
26 * Define WIN32 when build target is Win32 API
29 #if (defined(_WIN32) || defined(__WIN32__)) && \
30 !defined(WIN32) && !defined(__SYMBIAN32__)
34 #include <sys/types.h>
36 /* HP-UX systems version 9, 10 and 11 lack sys/select.h and so does oldish
37 libc5-based Linux systems. Only include it on system that are known to
39 #if defined(_AIX) || defined(__NOVELL_LIBC__) || defined(__NetBSD__) || \
40 defined(__minix) || defined(__SYMBIAN32__) || defined(__INTEGRITY) || \
41 defined(ANDROID) || defined(__ANDROID__)
42 #include <sys/select.h>
44 #if (defined(NETWARE) && !defined(__NOVELL_LIBC__))
45 #include <sys/bsdskt.h>
49 # include <netinet/in.h>
50 # include <sys/socket.h>
52 #elif defined(_WIN32_WCE)
53 # ifndef WIN32_LEAN_AND_MEAN
54 # define WIN32_LEAN_AND_MEAN
59 # ifndef WIN32_LEAN_AND_MEAN
60 # define WIN32_LEAN_AND_MEAN
63 # include <winsock2.h>
64 # include <ws2tcpip.h>
66 # include <sys/socket.h>
67 # include <netinet/in.h>
75 ** c-ares external API function linkage decorations.
78 #ifdef CARES_STATICLIB
80 #elif defined(WIN32) || defined(_WIN32) || defined(__SYMBIAN32__)
81 # if defined(CARES_BUILDING_LIBRARY)
82 # define CARES_EXTERN __declspec(dllexport)
84 # define CARES_EXTERN __declspec(dllimport)
86 #elif defined(CARES_BUILDING_LIBRARY) && defined(CARES_SYMBOL_HIDING)
87 # define CARES_EXTERN CARES_SYMBOL_SCOPE_EXTERN
93 #define ARES_SUCCESS 0
95 /* Server error codes (ARES_ENODATA indicates no relevant answer) */
96 #define ARES_ENODATA 1
97 #define ARES_EFORMERR 2
98 #define ARES_ESERVFAIL 3
99 #define ARES_ENOTFOUND 4
100 #define ARES_ENOTIMP 5
101 #define ARES_EREFUSED 6
103 /* Locally generated error codes */
104 #define ARES_EBADQUERY 7
105 #define ARES_EBADNAME 8
106 #define ARES_EBADFAMILY 9
107 #define ARES_EBADRESP 10
108 #define ARES_ECONNREFUSED 11
109 #define ARES_ETIMEOUT 12
111 #define ARES_EFILE 14
112 #define ARES_ENOMEM 15
113 #define ARES_EDESTRUCTION 16
114 #define ARES_EBADSTR 17
116 /* ares_getnameinfo error codes */
117 #define ARES_EBADFLAGS 18
119 /* ares_getaddrinfo error codes */
120 #define ARES_ENONAME 19
121 #define ARES_EBADHINTS 20
123 /* Uninitialized library error code */
124 #define ARES_ENOTINITIALIZED 21 /* introduced in 1.7.0 */
126 /* ares_library_init error codes */
127 #define ARES_ELOADIPHLPAPI 22 /* introduced in 1.7.0 */
128 #define ARES_EADDRGETNETWORKPARAMS 23 /* introduced in 1.7.0 */
130 /* More error codes */
131 #define ARES_ECANCELLED 24 /* introduced in 1.7.0 */
134 #define ARES_FLAG_USEVC (1 << 0)
135 #define ARES_FLAG_PRIMARY (1 << 1)
136 #define ARES_FLAG_IGNTC (1 << 2)
137 #define ARES_FLAG_NORECURSE (1 << 3)
138 #define ARES_FLAG_STAYOPEN (1 << 4)
139 #define ARES_FLAG_NOSEARCH (1 << 5)
140 #define ARES_FLAG_NOALIASES (1 << 6)
141 #define ARES_FLAG_NOCHECKRESP (1 << 7)
142 #define ARES_FLAG_EDNS (1 << 8)
144 /* Option mask values */
145 #define ARES_OPT_FLAGS (1 << 0)
146 #define ARES_OPT_TIMEOUT (1 << 1)
147 #define ARES_OPT_TRIES (1 << 2)
148 #define ARES_OPT_NDOTS (1 << 3)
149 #define ARES_OPT_UDP_PORT (1 << 4)
150 #define ARES_OPT_TCP_PORT (1 << 5)
151 #define ARES_OPT_SERVERS (1 << 6)
152 #define ARES_OPT_DOMAINS (1 << 7)
153 #define ARES_OPT_LOOKUPS (1 << 8)
154 #define ARES_OPT_SOCK_STATE_CB (1 << 9)
155 #define ARES_OPT_SORTLIST (1 << 10)
156 #define ARES_OPT_SOCK_SNDBUF (1 << 11)
157 #define ARES_OPT_SOCK_RCVBUF (1 << 12)
158 #define ARES_OPT_TIMEOUTMS (1 << 13)
159 #define ARES_OPT_ROTATE (1 << 14)
160 #define ARES_OPT_EDNSPSZ (1 << 15)
162 /* Nameinfo flag values */
163 #define ARES_NI_NOFQDN (1 << 0)
164 #define ARES_NI_NUMERICHOST (1 << 1)
165 #define ARES_NI_NAMEREQD (1 << 2)
166 #define ARES_NI_NUMERICSERV (1 << 3)
167 #define ARES_NI_DGRAM (1 << 4)
168 #define ARES_NI_TCP 0
169 #define ARES_NI_UDP ARES_NI_DGRAM
170 #define ARES_NI_SCTP (1 << 5)
171 #define ARES_NI_DCCP (1 << 6)
172 #define ARES_NI_NUMERICSCOPE (1 << 7)
173 #define ARES_NI_LOOKUPHOST (1 << 8)
174 #define ARES_NI_LOOKUPSERVICE (1 << 9)
175 /* Reserved for future use */
176 #define ARES_NI_IDN (1 << 10)
177 #define ARES_NI_IDN_ALLOW_UNASSIGNED (1 << 11)
178 #define ARES_NI_IDN_USE_STD3_ASCII_RULES (1 << 12)
180 /* Addrinfo flag values */
181 #define ARES_AI_CANONNAME (1 << 0)
182 #define ARES_AI_NUMERICHOST (1 << 1)
183 #define ARES_AI_PASSIVE (1 << 2)
184 #define ARES_AI_NUMERICSERV (1 << 3)
185 #define ARES_AI_V4MAPPED (1 << 4)
186 #define ARES_AI_ALL (1 << 5)
187 #define ARES_AI_ADDRCONFIG (1 << 6)
188 /* Reserved for future use */
189 #define ARES_AI_IDN (1 << 10)
190 #define ARES_AI_IDN_ALLOW_UNASSIGNED (1 << 11)
191 #define ARES_AI_IDN_USE_STD3_ASCII_RULES (1 << 12)
192 #define ARES_AI_CANONIDN (1 << 13)
194 #define ARES_AI_MASK (ARES_AI_CANONNAME|ARES_AI_NUMERICHOST|ARES_AI_PASSIVE| \
195 ARES_AI_NUMERICSERV|ARES_AI_V4MAPPED|ARES_AI_ALL| \
197 #define ARES_GETSOCK_MAXNUM 16 /* ares_getsock() can return info about this
199 #define ARES_GETSOCK_READABLE(bits,num) (bits & (1<< (num)))
200 #define ARES_GETSOCK_WRITABLE(bits,num) (bits & (1 << ((num) + \
201 ARES_GETSOCK_MAXNUM)))
203 /* c-ares library initialization flag values */
204 #define ARES_LIB_INIT_NONE (0)
205 #define ARES_LIB_INIT_WIN32 (1 << 0)
206 #define ARES_LIB_INIT_ALL (ARES_LIB_INIT_WIN32)
210 * Typedef our socket type
213 #ifndef ares_socket_typedef
215 typedef SOCKET ares_socket_t;
216 #define ARES_SOCKET_BAD INVALID_SOCKET
218 typedef int ares_socket_t;
219 #define ARES_SOCKET_BAD -1
221 #define ares_socket_typedef
222 #endif /* ares_socket_typedef */
224 typedef void (*ares_sock_state_cb)(void *data,
225 ares_socket_t socket_fd,
231 /* NOTE about the ares_options struct to users and developers.
233 This struct will remain looking like this. It will not be extended nor
234 shrunk in future releases, but all new options will be set by ares_set_*()
235 options instead of with the ares_init_options() function.
237 Eventually (in a galaxy far far away), all options will be settable by
238 ares_set_*() options and the ares_init_options() function will become
241 When new options are added to c-ares, they are not added to this
242 struct. And they are not "saved" with the ares_save_options() function but
243 instead we encourage the use of the ares_dup() function. Needless to say,
244 if you add config options to c-ares you need to make sure ares_dup()
245 duplicates this new option.
248 struct ares_options {
250 int timeout; /* in seconds or milliseconds, depending on options */
253 unsigned short udp_port;
254 unsigned short tcp_port;
255 int socket_send_buffer_size;
256 int socket_receive_buffer_size;
257 struct in_addr *servers;
262 ares_sock_state_cb sock_state_cb;
263 void *sock_state_cb_data;
264 struct apattern *sortlist;
272 struct ares_channeldata;
274 typedef struct ares_channeldata *ares_channel;
276 typedef void (*ares_callback)(void *arg,
282 typedef void (*ares_host_callback)(void *arg,
285 struct hostent *hostent);
287 typedef void (*ares_nameinfo_callback)(void *arg,
293 typedef int (*ares_sock_create_callback)(ares_socket_t socket_fd,
297 CARES_EXTERN int ares_library_init(int flags);
299 CARES_EXTERN void ares_library_cleanup(void);
301 CARES_EXTERN const char *ares_version(int *version);
303 CARES_EXTERN int ares_init(ares_channel *channelptr);
305 CARES_EXTERN int ares_init_options(ares_channel *channelptr,
306 struct ares_options *options,
309 CARES_EXTERN int ares_save_options(ares_channel channel,
310 struct ares_options *options,
313 CARES_EXTERN void ares_destroy_options(struct ares_options *options);
315 CARES_EXTERN int ares_dup(ares_channel *dest,
318 CARES_EXTERN void ares_destroy(ares_channel channel);
320 CARES_EXTERN void ares_cancel(ares_channel channel);
322 /* These next 3 configure local binding for the out-going socket
323 * connection. Use these to specify source IP and/or network device
324 * on multi-homed systems.
326 CARES_EXTERN void ares_set_local_ip4(ares_channel channel, unsigned int local_ip);
328 /* local_ip6 should be 16 bytes in length */
329 CARES_EXTERN void ares_set_local_ip6(ares_channel channel,
330 const unsigned char* local_ip6);
332 /* local_dev_name should be null terminated. */
333 CARES_EXTERN void ares_set_local_dev(ares_channel channel,
334 const char* local_dev_name);
336 CARES_EXTERN void ares_set_socket_callback(ares_channel channel,
337 ares_sock_create_callback callback,
340 CARES_EXTERN void ares_send(ares_channel channel,
341 const unsigned char *qbuf,
343 ares_callback callback,
346 CARES_EXTERN void ares_query(ares_channel channel,
350 ares_callback callback,
353 CARES_EXTERN void ares_search(ares_channel channel,
357 ares_callback callback,
360 CARES_EXTERN void ares_gethostbyname(ares_channel channel,
363 ares_host_callback callback,
366 CARES_EXTERN int ares_gethostbyname_file(ares_channel channel,
369 struct hostent **host);
371 CARES_EXTERN void ares_gethostbyaddr(ares_channel channel,
375 ares_host_callback callback,
378 CARES_EXTERN void ares_getnameinfo(ares_channel channel,
379 const struct sockaddr *sa,
380 ares_socklen_t salen,
382 ares_nameinfo_callback callback,
385 CARES_EXTERN int ares_fds(ares_channel channel,
389 CARES_EXTERN int ares_getsock(ares_channel channel,
390 ares_socket_t *socks,
393 CARES_EXTERN struct timeval *ares_timeout(ares_channel channel,
394 struct timeval *maxtv,
397 CARES_EXTERN void ares_process(ares_channel channel,
401 CARES_EXTERN void ares_process_fd(ares_channel channel,
402 ares_socket_t read_fd,
403 ares_socket_t write_fd);
405 CARES_EXTERN int ares_create_query(const char *name,
414 CARES_EXTERN int ares_mkquery(const char *name,
422 CARES_EXTERN int ares_expand_name(const unsigned char *encoded,
423 const unsigned char *abuf,
428 CARES_EXTERN int ares_expand_string(const unsigned char *encoded,
429 const unsigned char *abuf,
435 * NOTE: before c-ares 1.7.0 we would most often use the system in6_addr
436 * struct below when ares itself was built, but many apps would use this
437 * private version since the header checked a HAVE_* define for it. Starting
438 * with 1.7.0 we always declare and use our own to stop relying on the
441 struct ares_in6_addr {
443 unsigned char _S6_u8[16];
447 struct ares_addrttl {
448 struct in_addr ipaddr;
452 struct ares_addr6ttl {
453 struct ares_in6_addr ip6addr;
457 struct ares_srv_reply {
458 struct ares_srv_reply *next;
460 unsigned short priority;
461 unsigned short weight;
465 struct ares_mx_reply {
466 struct ares_mx_reply *next;
468 unsigned short priority;
471 struct ares_txt_reply {
472 struct ares_txt_reply *next;
474 size_t length; /* length excludes null termination */
477 struct ares_naptr_reply {
478 struct ares_naptr_reply *next;
479 unsigned char *flags;
480 unsigned char *service;
481 unsigned char *regexp;
483 unsigned short order;
484 unsigned short preference;
487 struct ares_soa_reply {
491 unsigned int refresh;
498 ** Parse the buffer, starting at *abuf and of length alen bytes, previously
499 ** obtained from an ares_search call. Put the results in *host, if nonnull.
500 ** Also, if addrttls is nonnull, put up to *naddrttls IPv4 addresses along with
501 ** their TTLs in that array, and set *naddrttls to the number of addresses
505 CARES_EXTERN int ares_parse_a_reply(const unsigned char *abuf,
507 struct hostent **host,
508 struct ares_addrttl *addrttls,
511 CARES_EXTERN int ares_parse_aaaa_reply(const unsigned char *abuf,
513 struct hostent **host,
514 struct ares_addr6ttl *addrttls,
517 CARES_EXTERN int ares_parse_ptr_reply(const unsigned char *abuf,
522 struct hostent **host);
524 CARES_EXTERN int ares_parse_ns_reply(const unsigned char *abuf,
526 struct hostent **host);
528 CARES_EXTERN int ares_parse_srv_reply(const unsigned char* abuf,
530 struct ares_srv_reply** srv_out);
532 CARES_EXTERN int ares_parse_mx_reply(const unsigned char* abuf,
534 struct ares_mx_reply** mx_out);
536 CARES_EXTERN int ares_parse_txt_reply(const unsigned char* abuf,
538 struct ares_txt_reply** txt_out);
540 CARES_EXTERN int ares_parse_naptr_reply(const unsigned char* abuf,
542 struct ares_naptr_reply** naptr_out);
544 CARES_EXTERN int ares_parse_soa_reply(const unsigned char* abuf,
546 struct ares_soa_reply** soa_out);
548 CARES_EXTERN void ares_free_string(void *str);
550 CARES_EXTERN void ares_free_hostent(struct hostent *host);
552 CARES_EXTERN void ares_free_data(void *dataptr);
554 CARES_EXTERN const char *ares_strerror(int code);
556 /* TODO: Hold port here as well. */
557 struct ares_addr_node {
558 struct ares_addr_node *next;
561 struct in_addr addr4;
562 struct ares_in6_addr addr6;
566 CARES_EXTERN int ares_set_servers(ares_channel channel,
567 struct ares_addr_node *servers);
569 /* Incomming string format: host[:port][,host[:port]]... */
570 CARES_EXTERN int ares_set_servers_csv(ares_channel channel,
571 const char* servers);
573 CARES_EXTERN int ares_get_servers(ares_channel channel,
574 struct ares_addr_node **servers);
576 CARES_EXTERN const char *ares_inet_ntop(int af, const void *src, char *dst,
577 ares_socklen_t size);
579 CARES_EXTERN int ares_inet_pton(int af, const char *src, void *dst);