5628df75 |
1 | /* |
2 | * Copyright (C)1998 Ian Jackson. |
3 | * This version provided for review and comment only. |
4 | * |
5 | * $Id$ |
6 | */ |
a17d3a1d |
7 | |
8 | #ifndef ADNS_H_INCLUDED |
9 | #define ADNS_H_INCLUDED |
10 | |
4353a5c4 |
11 | #include <stdio.h> |
12 | |
964344fc |
13 | #include <sys/socket.h> |
14 | #include <netinet/in.h> |
15 | |
16 | typedef struct adns__state *adns_state; |
17 | typedef struct adns__query *adns_query; |
a17d3a1d |
18 | |
19 | typedef enum { |
37e28fde |
20 | adns_if_noenv= 0x0001, /* do not look at environment */ |
21 | adns_if_noerrprint= 0x0002, /* never print output to stderr (_debug overrides) */ |
22 | adns_if_noserverwarn= 0x0004, /* do not warn to stderr about duff nameservers etc */ |
ddfda861 |
23 | adns_if_debug= 0x0008, /* enable all output to stderr plus debug msgs */ |
37e28fde |
24 | adns_if_noautosys= 0x0010, /* do not make syscalls at every opportunity */ |
a17d3a1d |
25 | } adns_initflags; |
26 | |
27 | typedef enum { |
ddfda861 |
28 | adns_qf_search= 0x0001, /* use the searchlist */ |
29 | adns_qf_usevc= 0x0002, /* use a virtual circuit (TCP connection) */ |
30 | adns_qf_anyquote= 0x0004, |
31 | adns_qf_loosecname= 0x0008, /* allow refs to CNAMEs - without, get _s_cname */ |
32 | adns_qf_nocname= 0x0010, /* don't follow CNAMEs, instead give _s_cname */ |
a17d3a1d |
33 | } adns_queryflags; |
34 | |
35 | typedef enum { |
350d37d9 |
36 | adns__rrt_typemask= 0x0ffff, |
ddfda861 |
37 | adns__qtf_deref= 0x10000, /* dereference domains and perhaps produce extra data */ |
38 | adns__qtf_mail822= 0x20000, /* make mailboxes be in RFC822 rcpt field format */ |
39 | adns__qtf_masterfmt= 0x80000, /* convert RRs to master file format, return as str */ |
40 | |
350d37d9 |
41 | adns_r_none= 0, |
ddfda861 |
42 | |
350d37d9 |
43 | adns_r_a= 1, |
4353a5c4 |
44 | adns_r_a_mf= adns_r_a|adns__qtf_masterfmt, |
ddfda861 |
45 | |
350d37d9 |
46 | adns_r_ns_raw= 2, |
47 | adns_r_ns= adns_r_ns_raw|adns__qtf_deref, |
4353a5c4 |
48 | adns_r_ns_mf= adns_r_ns_raw|adns__qtf_masterfmt, |
ddfda861 |
49 | |
350d37d9 |
50 | adns_r_cname= 5, |
4353a5c4 |
51 | adns_r_cname_mf= adns_r_cname|adns__qtf_masterfmt, |
ddfda861 |
52 | |
350d37d9 |
53 | adns_r_soa_raw= 6, |
ddfda861 |
54 | adns_r_soa= adns_r_soa_raw|adns__qtf_mail822, |
4353a5c4 |
55 | adns_r_soa_mf= adns_r_soa_raw|adns__qtf_masterfmt, |
ddfda861 |
56 | |
350d37d9 |
57 | adns_r_null= 10, |
4353a5c4 |
58 | adns_r_null_mf= adns_r_null|adns__qtf_masterfmt, |
ddfda861 |
59 | |
350d37d9 |
60 | adns_r_ptr_raw= 12, |
61 | adns_r_ptr= adns_r_ptr_raw|adns__qtf_deref, |
4353a5c4 |
62 | adns_r_ptr_mf= adns_r_ptr_raw|adns__qtf_masterfmt, |
ddfda861 |
63 | |
350d37d9 |
64 | adns_r_hinfo= 13, |
4353a5c4 |
65 | adns_r_hinfo_mf= adns_r_hinfo|adns__qtf_masterfmt, |
ddfda861 |
66 | |
350d37d9 |
67 | adns_r_mx_raw= 15, |
68 | adns_r_mx= adns_r_mx_raw|adns__qtf_deref, |
4353a5c4 |
69 | adns_r_mx_mf= adns_r_mx_raw|adns__qtf_masterfmt, |
ddfda861 |
70 | |
350d37d9 |
71 | adns_r_txt= 16, |
4353a5c4 |
72 | adns_r_txt_mf= adns_r_txt|adns__qtf_masterfmt, |
ddfda861 |
73 | |
350d37d9 |
74 | adns_r_rp_raw= 17, |
4353a5c4 |
75 | adns_r_rp= adns_r_rp_raw|adns__qtf_mail822, |
76 | adns_r_rp_mf= adns_r_rp_raw|adns__qtf_masterfmt |
ddfda861 |
77 | |
a17d3a1d |
78 | } adns_rrtype; |
79 | |
964344fc |
80 | /* In queries without qtf_anyquote, all domains must have standard |
81 | * legal syntax. In queries _with_ qtf_anyquote, domains in the query |
82 | * or response may contain any characters, quoted according to |
83 | * RFC1035 5.1. On input to adns, the char* is a pointer to the |
84 | * interior of a " delimited string, except that " may appear in it, |
85 | * and on output, the char* is a pointer to a string which would be |
86 | * legal either inside or outside " delimiters, and any characters |
87 | * not usually legal in domain names will be quoted as \X |
88 | * (if the character is 33-126 except \ and ") or \DDD. |
89 | * |
ddfda861 |
90 | * _qtf_anyquote is ignored for _mf queries. |
91 | * |
92 | * Do not ask for _raw records containing mailboxes without |
93 | * specifying _qf_anyquote. |
964344fc |
94 | */ |
95 | |
a17d3a1d |
96 | typedef enum { |
97 | adns_s_ok, |
37e28fde |
98 | adns_s_timeout, |
350d37d9 |
99 | adns_s_nolocalmem, |
4bec51a4 |
100 | adns_s_allservfail, |
0ba0614a |
101 | adns_s_servfail, |
b9de380c |
102 | adns_s_notimplemented, |
103 | adns_s_refused, |
104 | adns_s_reasonunknown, |
ec477b9e |
105 | adns_s_norecurse, |
106 | adns_s_serverfaulty, |
b9de380c |
107 | adns_s_unknownreply, |
108 | adns_s_max_tempfail= 99, |
37e28fde |
109 | adns_s_inconsistent, /* PTR gives domain whose A does not match */ |
ddfda861 |
110 | adns_s_cname, /* CNAME found where data eg A expected (not if _qf_loosecname) */ |
b9de380c |
111 | /* fixme: implement _s_cname */ |
112 | adns_s_max_remotemisconfig= 199, |
a17d3a1d |
113 | adns_s_nxdomain, |
0ba0614a |
114 | adns_s_nodata, |
115 | adns_s_invaliddomain, |
116 | adns_s_domaintoolong, |
a17d3a1d |
117 | } adns_status; |
118 | |
e8c505a5 |
119 | typedef struct { |
84fe28db |
120 | char *dm; |
121 | adns_status astatus; |
122 | int naddrs; /* temp fail => -1, perm fail => 0, s_ok => >0 */ |
123 | struct in_addr *addrs; |
4353a5c4 |
124 | } adns_rr_dmaddr; |
125 | |
126 | typedef struct { |
127 | char *a, *b; |
128 | } adns_rr_strpair; |
129 | |
130 | typedef struct { |
131 | int i; |
132 | adns_rr_dmaddr dmaddr; |
133 | } adns_rr_intdmaddr; |
134 | |
135 | typedef struct { |
136 | int i; |
137 | char *str; |
138 | } adns_rr_intstr; |
139 | |
140 | typedef struct { |
141 | char *ns0, *rp; |
142 | unsigned long serial, refresh, retry, expire, minimum; |
143 | } adns_rr_soa; |
84fe28db |
144 | |
145 | typedef struct { |
a17d3a1d |
146 | adns_status status; |
147 | char *cname; /* always NULL if query was for CNAME records */ |
148 | adns_rrtype type; |
149 | int nrrs; |
150 | union { |
4353a5c4 |
151 | char *(*str); /* ns_raw, cname, ptr, ptr_raw, txt, <any>_mf */ |
98a3f706 |
152 | struct in_addr *inaddr; /* a */ |
4353a5c4 |
153 | adns_rr_dmaddr *dmaddr; /* ns */ |
154 | adns_rr_strpair *strpair; /* hinfo, rp, rp_raw */ |
155 | adns_rr_intdmaddr *intdmaddr; /* mx */ |
156 | adns_rr_intstr *intstr; /* mx_raw */ |
157 | adns_rr_soa *soa; /* soa, soa_raw */ |
a17d3a1d |
158 | /* NULL is empty */ |
159 | } rrs; |
e8c505a5 |
160 | } adns_answer; |
a17d3a1d |
161 | |
162 | /* Memory management: |
163 | * adns_state and adns_query are actually pointers to malloc'd state; |
164 | * On submission questions are copied, including the owner domain; |
4353a5c4 |
165 | * Answers are malloc'd as a single piece of memory; pointers in the |
166 | * answer struct point into further memory in the answer. |
a17d3a1d |
167 | * query_io: |
168 | * Must always be non-null pointer; |
169 | * If *query_io is 0 to start with then any query may be returned; |
170 | * If *query_io is !0 adns_query then only that query may be returned. |
171 | * Errors: |
172 | * Return values are 0 or an errno value; |
173 | * Seriously fatal system errors (eg, failure to create sockets, |
174 | * malloc failure, etc.) return errno values; |
175 | * Other errors (nameserver failure, timed out connections, &c) |
176 | * are returned in the status field of the answer. If status is |
177 | * nonzero then nrrs will be 0, otherwise it will be >0. |
178 | * type will always be the type requested; |
e8c505a5 |
179 | * If no (appropriate) requests are done adns_check returns EWOULDBLOCK; |
180 | * If no (appropriate) requests are outstanding adns_query and adns_wait return ESRCH; |
a17d3a1d |
181 | */ |
182 | |
37e28fde |
183 | int adns_init(adns_state *newstate_r, adns_initflags flags, FILE *diagfile/*0=>stderr*/); |
a17d3a1d |
184 | |
185 | int adns_synchronous(adns_state ads, |
186 | const char *owner, |
187 | adns_rrtype type, |
72934832 |
188 | adns_queryflags flags, |
9d95094c |
189 | adns_answer **answer_r); |
72934832 |
190 | /* Will not return EINTR. */ |
e8c505a5 |
191 | |
192 | /* NB: if you set adns_if_noautosys then _submit and _check do not |
193 | * make any system calls; you must use adns_callback (possibly after |
194 | * adns_interest) to actually get things to happen. |
195 | */ |
a17d3a1d |
196 | |
197 | int adns_submit(adns_state ads, |
198 | const char *owner, |
199 | adns_rrtype type, |
72934832 |
200 | adns_queryflags flags, |
a17d3a1d |
201 | void *context, |
964344fc |
202 | adns_query *query_r); |
a17d3a1d |
203 | |
964344fc |
204 | int adns_check(adns_state ads, |
a17d3a1d |
205 | adns_query *query_io, |
9d95094c |
206 | adns_answer **answer_r, |
207 | void **context_r); |
a17d3a1d |
208 | |
209 | int adns_wait(adns_state ads, |
210 | adns_query *query_io, |
9d95094c |
211 | adns_answer **answer_r, |
212 | void **context_r); |
72934832 |
213 | /* Might return EINTR - if so, try again */ |
a17d3a1d |
214 | |
e8c505a5 |
215 | void adns_cancel(adns_state ads, adns_query query); |
a17d3a1d |
216 | |
217 | int adns_finish(adns_state); |
218 | |
e8c505a5 |
219 | int adns_callback(adns_state, int maxfd, const fd_set *readfds, const fd_set *writefds, |
220 | const fd_set *exceptfds); |
221 | /* Gives adns flow-of-control for a bit. This will never block. |
222 | * If maxfd == -1 then adns will check (make nonblocking system calls on) |
223 | * all of its own filedescriptors; otherwise it will only use those |
224 | * < maxfd and specified in the fd_set's, as if select had returned them. |
225 | * Other fd's may be in the fd_sets, and will be ignored. |
226 | * _callback returns how many adns fd's were in the various sets, so |
227 | * you can tell if your select handling code has missed something and is going awol. |
4353a5c4 |
228 | * |
229 | * May also return -1 if a critical syscall failed, setting errno. |
964344fc |
230 | */ |
231 | |
e8c505a5 |
232 | void adns_interest(adns_state, int *maxfd_io, fd_set *readfds_io, |
233 | fd_set *writefds_io, fd_set *exceptfds_io, |
234 | struct timeval **tv_mod, struct timeval *tv_buf); |
235 | /* Find out file descriptors adns is interested in, and when it |
236 | * would like the opportunity to time something out. If you do not plan to |
237 | * block then tv_mod may be 0. Otherwise, tv_mod may point to 0 meaning |
238 | * you have no timeout of your own, in which case tv_buf must be non-null and |
239 | * _interest may fill it in and set *tv_mod=tv_buf. |
240 | * readfds, writefds, exceptfds and maxfd may not be 0. |
964344fc |
241 | */ |
a17d3a1d |
242 | |
243 | /* Example expected/legal calling sequences: |
244 | * adns_init |
245 | * adns_submit 1 |
246 | * adns_submit 2 |
247 | * adns_submit 3 |
248 | * adns_wait 1 |
964344fc |
249 | * adns_check 3 -> EWOULDBLOCK |
a17d3a1d |
250 | * adns_wait 2 |
251 | * adns_wait 3 |
252 | * .... |
253 | * adns_finish |
254 | * |
e8c505a5 |
255 | * adns_init _noautosys |
a17d3a1d |
256 | * loop { |
a17d3a1d |
257 | * adns_interest |
258 | * select |
259 | * adns_callback |
e8c505a5 |
260 | * ... |
261 | * adns_submit / adns_check |
262 | * ... |
a17d3a1d |
263 | * } |
264 | */ |
265 | |
266 | #endif |