5628df75 |
1 | /* |
2 | * Copyright (C)1998 Ian Jackson. |
3 | * This version provided for review and comment only. |
4 | * |
5 | * $Id$ |
6 | */ |
e576be50 |
7 | /* |
8 | * This file is part of adns, which is Copyright (C) 1997, 1998 Ian Jackson |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License as published by |
12 | * the Free Software Foundation; either version 2, or (at your option) |
13 | * any later version. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
18 | * GNU General Public License for more details. |
19 | * |
20 | * You should have received a copy of the GNU General Public License |
21 | * along with this program; if not, write to the Free Software Foundation, |
22 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
23 | */ |
a17d3a1d |
24 | |
25 | #ifndef ADNS_H_INCLUDED |
26 | #define ADNS_H_INCLUDED |
27 | |
4353a5c4 |
28 | #include <stdio.h> |
29 | |
964344fc |
30 | #include <sys/socket.h> |
31 | #include <netinet/in.h> |
32 | |
33 | typedef struct adns__state *adns_state; |
34 | typedef struct adns__query *adns_query; |
a17d3a1d |
35 | |
36 | typedef enum { |
37e28fde |
37 | adns_if_noenv= 0x0001, /* do not look at environment */ |
38 | adns_if_noerrprint= 0x0002, /* never print output to stderr (_debug overrides) */ |
39 | adns_if_noserverwarn= 0x0004, /* do not warn to stderr about duff nameservers etc */ |
ddfda861 |
40 | adns_if_debug= 0x0008, /* enable all output to stderr plus debug msgs */ |
37e28fde |
41 | adns_if_noautosys= 0x0010, /* do not make syscalls at every opportunity */ |
88372443 |
42 | adns_if_eintr= 0x0020, /* allow _wait and _synchronous to return EINTR */ |
a17d3a1d |
43 | } adns_initflags; |
44 | |
45 | typedef enum { |
828d89bd |
46 | adns_qf_search= 0x000001, /* use the searchlist */ |
47 | adns_qf_usevc= 0x000002, /* use a virtual circuit (TCP connection) */ |
48 | adns_qf_quoteok_query= 0x000010, /* allow quote-requiring chars in query domain */ |
49 | adns_qf_quoteok_cname= 0x000020, /* allow ... in CNAME we go via */ |
50 | adns_qf_quoteok_anshost= 0x000040, /* allow ... in answers expected to be hostnames */ |
51 | adns_qf_cname_loose= 0x000100, /* allow refs to CNAMEs - without, get _s_cname */ |
52 | adns_qf_cname_forbid= 0x000200, /* don't follow CNAMEs, instead give _s_cname */ |
53 | adns__qf_internalmask= 0x0ff000 |
a17d3a1d |
54 | } adns_queryflags; |
55 | |
56 | typedef enum { |
350d37d9 |
57 | adns__rrt_typemask= 0x0ffff, |
ddfda861 |
58 | adns__qtf_deref= 0x10000, /* dereference domains and perhaps produce extra data */ |
59 | adns__qtf_mail822= 0x20000, /* make mailboxes be in RFC822 rcpt field format */ |
ddfda861 |
60 | |
350d37d9 |
61 | adns_r_none= 0, |
ddfda861 |
62 | |
350d37d9 |
63 | adns_r_a= 1, |
ddfda861 |
64 | |
350d37d9 |
65 | adns_r_ns_raw= 2, |
66 | adns_r_ns= adns_r_ns_raw|adns__qtf_deref, |
ddfda861 |
67 | |
350d37d9 |
68 | adns_r_cname= 5, |
ddfda861 |
69 | |
350d37d9 |
70 | adns_r_soa_raw= 6, |
ddfda861 |
71 | adns_r_soa= adns_r_soa_raw|adns__qtf_mail822, |
ddfda861 |
72 | |
350d37d9 |
73 | adns_r_ptr_raw= 12, |
74 | adns_r_ptr= adns_r_ptr_raw|adns__qtf_deref, |
ddfda861 |
75 | |
350d37d9 |
76 | adns_r_hinfo= 13, |
ddfda861 |
77 | |
350d37d9 |
78 | adns_r_mx_raw= 15, |
79 | adns_r_mx= adns_r_mx_raw|adns__qtf_deref, |
ddfda861 |
80 | |
350d37d9 |
81 | adns_r_txt= 16, |
ddfda861 |
82 | |
350d37d9 |
83 | adns_r_rp_raw= 17, |
4353a5c4 |
84 | adns_r_rp= adns_r_rp_raw|adns__qtf_mail822, |
828d89bd |
85 | |
86 | adns_r_addr= adns_r_a|adns__qtf_deref |
ddfda861 |
87 | |
a17d3a1d |
88 | } adns_rrtype; |
89 | |
964344fc |
90 | /* In queries without qtf_anyquote, all domains must have standard |
91 | * legal syntax. In queries _with_ qtf_anyquote, domains in the query |
92 | * or response may contain any characters, quoted according to |
93 | * RFC1035 5.1. On input to adns, the char* is a pointer to the |
94 | * interior of a " delimited string, except that " may appear in it, |
95 | * and on output, the char* is a pointer to a string which would be |
96 | * legal either inside or outside " delimiters, and any characters |
97 | * not usually legal in domain names will be quoted as \X |
98 | * (if the character is 33-126 except \ and ") or \DDD. |
99 | * |
ddfda861 |
100 | * Do not ask for _raw records containing mailboxes without |
101 | * specifying _qf_anyquote. |
964344fc |
102 | */ |
103 | |
a17d3a1d |
104 | typedef enum { |
e062dcae |
105 | /* fixme: think about error codes */ |
a17d3a1d |
106 | adns_s_ok, |
37e28fde |
107 | adns_s_timeout, |
350d37d9 |
108 | adns_s_nolocalmem, |
4bec51a4 |
109 | adns_s_allservfail, |
0ba0614a |
110 | adns_s_servfail, |
b9de380c |
111 | adns_s_notimplemented, |
112 | adns_s_refused, |
113 | adns_s_reasonunknown, |
ec477b9e |
114 | adns_s_norecurse, |
115 | adns_s_serverfaulty, |
b9de380c |
116 | adns_s_unknownreply, |
e7a9ca47 |
117 | adns_s_invaliddata, |
b9de380c |
118 | adns_s_max_tempfail= 99, |
37e28fde |
119 | adns_s_inconsistent, /* PTR gives domain whose A does not match */ |
ddfda861 |
120 | adns_s_cname, /* CNAME found where data eg A expected (not if _qf_loosecname) */ |
ffbda80c |
121 | adns_s_invalidanswerdomain, |
b9de380c |
122 | /* fixme: implement _s_cname */ |
123 | adns_s_max_remotemisconfig= 199, |
a17d3a1d |
124 | adns_s_nxdomain, |
0ba0614a |
125 | adns_s_nodata, |
ffbda80c |
126 | adns_s_invalidquerydomain, |
0ba0614a |
127 | adns_s_domaintoolong, |
a17d3a1d |
128 | } adns_status; |
129 | |
e8c505a5 |
130 | typedef struct { |
828d89bd |
131 | int len; |
132 | union { |
133 | struct sockaddr sa; |
134 | struct sockaddr_in inet; |
135 | } addr; |
136 | } adns_addr; |
137 | |
138 | typedef struct { |
1dfe95d8 |
139 | char *host; |
84fe28db |
140 | adns_status astatus; |
141 | int naddrs; /* temp fail => -1, perm fail => 0, s_ok => >0 */ |
828d89bd |
142 | adns_addr *addrs; |
c7836bc9 |
143 | } adns_rr_hostaddr; |
4353a5c4 |
144 | |
145 | typedef struct { |
146 | char *a, *b; |
147 | } adns_rr_strpair; |
148 | |
149 | typedef struct { |
150 | int i; |
1dfe95d8 |
151 | adns_rr_hostaddr ha; |
c7836bc9 |
152 | } adns_rr_inthostaddr; |
4353a5c4 |
153 | |
154 | typedef struct { |
e062dcae |
155 | /* Used both for mx_raw, in which case i is the preference and str the domain, |
156 | * and for txt, in which case each entry has i for the `text' length, |
157 | * and str for the data (which will have had an extra nul appended |
158 | * so that if it was plain text it is now a null-terminated string). |
159 | */ |
4353a5c4 |
160 | int i; |
161 | char *str; |
162 | } adns_rr_intstr; |
163 | |
164 | typedef struct { |
165 | char *ns0, *rp; |
166 | unsigned long serial, refresh, retry, expire, minimum; |
167 | } adns_rr_soa; |
84fe28db |
168 | |
169 | typedef struct { |
a17d3a1d |
170 | adns_status status; |
171 | char *cname; /* always NULL if query was for CNAME records */ |
86e7b8d9 |
172 | adns_rrtype type; /* guaranteed to be same as in query */ |
8e5b0abb |
173 | int nrrs, rrsz; |
a17d3a1d |
174 | union { |
8e5b0abb |
175 | void *untyped; |
176 | unsigned char *bytes; |
c7836bc9 |
177 | char *(*str); /* ns_raw, cname, ptr, ptr_raw */ |
178 | adns_rr_intstr *(*manyistr); /* txt (list of strings ends with i=-1, str=0) */ |
179 | adns_addr *addr; /* addr */ |
180 | struct in_addr *inaddr; /* a */ |
181 | adns_rr_hostaddr *hostaddr; /* ns */ |
182 | adns_rr_strpair *strpair; /* hinfo ??fixme, rp, rp_raw */ |
183 | adns_rr_inthostaddr *inthostaddr; /* mx */ |
184 | adns_rr_intstr *intstr; /* mx_raw */ |
185 | adns_rr_soa *soa; /* soa, soa_raw */ |
a17d3a1d |
186 | } rrs; |
e8c505a5 |
187 | } adns_answer; |
a17d3a1d |
188 | |
189 | /* Memory management: |
190 | * adns_state and adns_query are actually pointers to malloc'd state; |
191 | * On submission questions are copied, including the owner domain; |
4353a5c4 |
192 | * Answers are malloc'd as a single piece of memory; pointers in the |
193 | * answer struct point into further memory in the answer. |
a17d3a1d |
194 | * query_io: |
195 | * Must always be non-null pointer; |
196 | * If *query_io is 0 to start with then any query may be returned; |
197 | * If *query_io is !0 adns_query then only that query may be returned. |
d3eea642 |
198 | * If the call is successful, *query_io, *answer_r, and *context_r |
199 | * will all be set. |
a17d3a1d |
200 | * Errors: |
201 | * Return values are 0 or an errno value; |
202 | * Seriously fatal system errors (eg, failure to create sockets, |
203 | * malloc failure, etc.) return errno values; |
204 | * Other errors (nameserver failure, timed out connections, &c) |
205 | * are returned in the status field of the answer. If status is |
206 | * nonzero then nrrs will be 0, otherwise it will be >0. |
207 | * type will always be the type requested; |
e8c505a5 |
208 | * If no (appropriate) requests are done adns_check returns EWOULDBLOCK; |
209 | * If no (appropriate) requests are outstanding adns_query and adns_wait return ESRCH; |
a17d3a1d |
210 | */ |
211 | |
bd6deb35 |
212 | /* fixme: separate parsing from instantiation */ |
37e28fde |
213 | int adns_init(adns_state *newstate_r, adns_initflags flags, FILE *diagfile/*0=>stderr*/); |
a17d3a1d |
214 | |
215 | int adns_synchronous(adns_state ads, |
216 | const char *owner, |
217 | adns_rrtype type, |
72934832 |
218 | adns_queryflags flags, |
9d95094c |
219 | adns_answer **answer_r); |
e8c505a5 |
220 | |
221 | /* NB: if you set adns_if_noautosys then _submit and _check do not |
222 | * make any system calls; you must use adns_callback (possibly after |
223 | * adns_interest) to actually get things to happen. |
224 | */ |
a17d3a1d |
225 | |
226 | int adns_submit(adns_state ads, |
227 | const char *owner, |
228 | adns_rrtype type, |
72934832 |
229 | adns_queryflags flags, |
a17d3a1d |
230 | void *context, |
964344fc |
231 | adns_query *query_r); |
a17d3a1d |
232 | |
964344fc |
233 | int adns_check(adns_state ads, |
a17d3a1d |
234 | adns_query *query_io, |
9d95094c |
235 | adns_answer **answer_r, |
236 | void **context_r); |
a17d3a1d |
237 | |
238 | int adns_wait(adns_state ads, |
239 | adns_query *query_io, |
9d95094c |
240 | adns_answer **answer_r, |
241 | void **context_r); |
a17d3a1d |
242 | |
3955725c |
243 | void adns_cancel(adns_query query); |
a17d3a1d |
244 | |
245 | int adns_finish(adns_state); |
e576be50 |
246 | /* You may call this even if you have queries outstanding; |
247 | * they will be cancelled. |
248 | */ |
a17d3a1d |
249 | |
e8c505a5 |
250 | int adns_callback(adns_state, int maxfd, const fd_set *readfds, const fd_set *writefds, |
251 | const fd_set *exceptfds); |
252 | /* Gives adns flow-of-control for a bit. This will never block. |
253 | * If maxfd == -1 then adns will check (make nonblocking system calls on) |
254 | * all of its own filedescriptors; otherwise it will only use those |
255 | * < maxfd and specified in the fd_set's, as if select had returned them. |
256 | * Other fd's may be in the fd_sets, and will be ignored. |
257 | * _callback returns how many adns fd's were in the various sets, so |
258 | * you can tell if your select handling code has missed something and is going awol. |
4353a5c4 |
259 | * |
260 | * May also return -1 if a critical syscall failed, setting errno. |
964344fc |
261 | */ |
262 | |
e8c505a5 |
263 | void adns_interest(adns_state, int *maxfd_io, fd_set *readfds_io, |
264 | fd_set *writefds_io, fd_set *exceptfds_io, |
265 | struct timeval **tv_mod, struct timeval *tv_buf); |
266 | /* Find out file descriptors adns is interested in, and when it |
267 | * would like the opportunity to time something out. If you do not plan to |
268 | * block then tv_mod may be 0. Otherwise, tv_mod may point to 0 meaning |
269 | * you have no timeout of your own, in which case tv_buf must be non-null and |
270 | * _interest may fill it in and set *tv_mod=tv_buf. |
271 | * readfds, writefds, exceptfds and maxfd may not be 0. |
964344fc |
272 | */ |
a17d3a1d |
273 | |
274 | /* Example expected/legal calling sequences: |
275 | * adns_init |
276 | * adns_submit 1 |
277 | * adns_submit 2 |
278 | * adns_submit 3 |
279 | * adns_wait 1 |
964344fc |
280 | * adns_check 3 -> EWOULDBLOCK |
a17d3a1d |
281 | * adns_wait 2 |
282 | * adns_wait 3 |
283 | * .... |
284 | * adns_finish |
285 | * |
e8c505a5 |
286 | * adns_init _noautosys |
a17d3a1d |
287 | * loop { |
a17d3a1d |
288 | * adns_interest |
289 | * select |
290 | * adns_callback |
e8c505a5 |
291 | * ... |
292 | * adns_submit / adns_check |
293 | * ... |
a17d3a1d |
294 | * } |
295 | */ |
296 | |
86e7b8d9 |
297 | adns_status adns_rr_info(adns_rrtype type, |
298 | const char **rrtname_r, const char **fmtname_r, |
299 | int *len_r, |
300 | const void *datap, char **data_r); |
301 | /* Gets information in human-readable (but non-i18n) form |
302 | * for eg debugging purposes. type must be specified, |
303 | * and the official name of the corresponding RR type will |
304 | * be returned in *rrtname_r, and information about the processing |
305 | * style in *fmtname_r. The length of the table entry in an answer |
306 | * for that type will be returned in in *len_r. |
307 | * Any or all of rrtname_r, fmtname_r and len_r may be 0. |
308 | * If fmtname_r is non-null then *fmtname_r may be |
309 | * null on return, indicating that no special processing is |
310 | * involved. |
311 | * |
312 | * data_r be must be non-null iff datap is. In this case |
313 | * *data_r will be set to point to a human-readable text |
314 | * string representing the RR data. The text will have |
315 | * been obtained from malloc() and must be freed by the caller. |
316 | * |
317 | * Usually this routine will succeed. Possible errors include: |
318 | * adns_s_nomemory |
319 | * adns_s_notimplemented (RR type not known) |
320 | * adns_s_invaliddata (*datap contained garbage) |
321 | * If an error occurs then no memory has been allocated, |
322 | * and *rrtname_r, *fmtname_r, *len_r and *data_r are undefined. |
323 | */ |
324 | |
31144a72 |
325 | const char *adns_strerror(adns_status st); |
326 | |
a17d3a1d |
327 | #endif |