e576be50 |
1 | /* |
2 | * internal.h |
3 | * - declarations of private objects with external linkage (adns__*) |
4 | * - definitons of internal macros |
5 | * - comments regarding library data structures |
6 | */ |
7 | /* |
a719a4be |
8 | * This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson |
e576be50 |
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 | */ |
37e28fde |
24 | |
25 | #ifndef ADNS_INTERNAL_H_INCLUDED |
26 | #define ADNS_INTERNAL_H_INCLUDED |
27 | |
11b35193 |
28 | #include "config.h" |
4353a5c4 |
29 | typedef unsigned char byte; |
30 | |
31 | #include <stdarg.h> |
32 | #include <assert.h> |
33 | #include <unistd.h> |
34 | |
37e28fde |
35 | #include <sys/time.h> |
36 | |
37 | #include "adns.h" |
38 | |
39 | /* Configuration and constants */ |
40 | |
41 | #define MAXSERVERS 5 |
09957b1c |
42 | #define MAXSORTLIST 15 |
4b707d8b |
43 | #define UDPMAXRETRIES 15 |
37e28fde |
44 | #define UDPRETRYMS 2000 |
45 | #define TCPMS 30000 |
46 | #define LOCALRESOURCEMS 20 |
b9de380c |
47 | |
98a3f706 |
48 | #define DNS_PORT 53 |
b9de380c |
49 | #define DNS_MAXUDP 512 |
50 | #define DNS_MAXDOMAIN 255 |
51 | #define DNS_HDRSIZE 12 |
52 | #define DNS_CLASS_IN 1 |
37e28fde |
53 | |
a6536d8b |
54 | #define DNS_INADDR_ARPA "in-addr", "arpa" |
55 | |
98a3f706 |
56 | typedef enum { |
57 | rcode_noerror, |
58 | rcode_formaterror, |
59 | rcode_servfail, |
60 | rcode_nxdomain, |
61 | rcode_notimp, |
62 | rcode_refused |
63 | } dns_rcode; |
64 | |
37e28fde |
65 | /* Shared data structures */ |
66 | |
4353a5c4 |
67 | typedef union { |
37e28fde |
68 | adns_status status; |
69 | char *cp; |
70 | adns_rrtype type; |
4353a5c4 |
71 | int i; |
37e28fde |
72 | struct in_addr ia; |
73 | unsigned long ul; |
4353a5c4 |
74 | } rr_align; |
75 | |
76 | typedef struct { |
77 | int used, avail; |
78 | byte *buf; |
79 | } vbuf; |
80 | |
0ba0614a |
81 | typedef struct { |
1dfe95d8 |
82 | adns_state ads; |
c7836bc9 |
83 | adns_query qu; |
1dfe95d8 |
84 | int serv; |
c7836bc9 |
85 | const byte *dgram; |
1dfe95d8 |
86 | int dglen, nsstart, nscount, arcount; |
7da21070 |
87 | struct timeval now; |
c7836bc9 |
88 | } parseinfo; |
89 | |
90 | typedef struct { |
0ba0614a |
91 | adns_rrtype type; |
86e7b8d9 |
92 | const char *rrtname; |
93 | const char *fmtname; |
98a3f706 |
94 | int rrsz; |
8e5b0abb |
95 | |
86e7b8d9 |
96 | void (*makefinal)(adns_query qu, void *data); |
97 | /* Change memory management of *data. |
98 | * Previously, used alloc_interim, now use alloc_final. |
99 | */ |
100 | |
101 | adns_status (*convstring)(vbuf *vb, const void *data); |
102 | /* Converts the RR data to a string representation in vbuf. |
103 | * vbuf will be appended to (it must have been initialised), |
104 | * and will not be null-terminated by convstring. |
105 | */ |
106 | |
1dfe95d8 |
107 | adns_status (*parse)(const parseinfo *pai, int cbyte, int max, void *store_r); |
31144a72 |
108 | /* Parse one RR, in dgram of length dglen, starting at cbyte and |
109 | * extending until at most max. |
110 | * |
111 | * The RR should be stored at *store_r, of length qu->typei->rrsz. |
112 | * |
113 | * If there is an overrun which might indicate truncation, it should set |
114 | * *rdstart to -1; otherwise it may set it to anything else positive. |
88372443 |
115 | * |
c7836bc9 |
116 | * nsstart is the offset of the authority section. |
8e5b0abb |
117 | */ |
e062dcae |
118 | |
09957b1c |
119 | int (*diff_needswap)(adns_state ads, const void *datap_a, const void *datap_b); |
88372443 |
120 | /* Returns !0 if RR a should be strictly after RR b in the sort order, |
e062dcae |
121 | * 0 otherwise. Must not fail. |
122 | */ |
5ed1b7e7 |
123 | |
124 | /* Now come a number of hooks which are usually zero. They are used by |
125 | * query types which need special processing, like adns_rr_addr. |
126 | */ |
127 | |
128 | int (*initqtype)(adns_state ads, adns_queryflags flags); |
129 | /* Returns the typecode (DNS, not adns_rr_type) for the initial |
130 | * query. The general code will always construct a query datagram |
131 | * for the owner domain specified in _submit. |
132 | * If !initqtype then (typeinfo->type & adns__rrt_typemask) is used. |
133 | */ |
134 | |
135 | adns_status (*begin)(adns_state ads, adns_query qu, struct timeval now); |
136 | /* Alternative `query start' function. If !begin then the general code |
137 | * will try to send the initial query datagram by UDP to a nameserver. |
138 | * If it returns an error then the original _submit will too; it may |
139 | * also choose to fail the query. |
140 | */ |
0ba0614a |
141 | } typeinfo; |
142 | |
8e5b0abb |
143 | typedef struct allocnode { |
551ff40f |
144 | struct allocnode *next, *back; |
8e5b0abb |
145 | } allocnode; |
146 | |
147 | union maxalign { |
148 | byte d[1]; |
149 | struct in_addr ia; |
150 | long l; |
151 | void *p; |
152 | void (*fp)(void); |
153 | union maxalign *up; |
154 | } data; |
155 | |
a6536d8b |
156 | typedef struct { |
157 | void *ext; |
158 | void (*callback)(adns_query parent, adns_query child); |
159 | union { |
160 | adns_rr_addr ptr_parent_addr; |
161 | adns_rr_hostaddr *hostaddr; |
162 | } info; |
163 | } qcontext; |
164 | |
37e28fde |
165 | struct adns__query { |
3955725c |
166 | adns_state ads; |
ddfda861 |
167 | enum { query_udp, query_tcpwait, query_tcpsent, query_child, query_done } state; |
4353a5c4 |
168 | adns_query back, next, parent; |
37e28fde |
169 | struct { adns_query head, tail; } children; |
170 | struct { adns_query back, next; } siblings; |
551ff40f |
171 | struct { allocnode *head, *tail; } allocations; |
68442019 |
172 | int interim_allocd; |
173 | void *final_allocspace; |
0ba0614a |
174 | |
175 | const typeinfo *typei; |
e062dcae |
176 | byte *query_dgram; |
8e5b0abb |
177 | int query_dglen; |
31144a72 |
178 | |
8e5b0abb |
179 | vbuf vb; |
180 | /* General-purpose messing-about buffer. |
181 | * Wherever a `big' interface is crossed, this may be corrupted/changed |
182 | * unless otherwise specified. |
183 | */ |
184 | |
185 | adns_answer *answer; |
186 | /* This is allocated when a query is submitted, to avoid being unable |
187 | * to relate errors to queries if we run out of memory. During |
188 | * query processing status, rrs is 0. cname is set if |
189 | * we found a cname (this corresponds to cname_dgram in the query |
190 | * structure). type is set from the word go. nrrs and rrs |
191 | * are set together, when we find how many rrs there are. |
192 | */ |
31144a72 |
193 | |
31144a72 |
194 | byte *cname_dgram; |
195 | int cname_dglen, cname_begin; |
3955725c |
196 | /* If non-0, has been allocated using . */ |
31144a72 |
197 | |
ddfda861 |
198 | int id, flags, udpretries; |
4353a5c4 |
199 | int udpnextserver; |
200 | unsigned long udpsent, tcpfailed; /* bitmap indexed by server */ |
37e28fde |
201 | struct timeval timeout; |
a6536d8b |
202 | |
203 | qcontext ctx; |
ddfda861 |
204 | |
37e28fde |
205 | /* Possible states: |
ddfda861 |
206 | * |
8e5b0abb |
207 | * state Queue child id nextudpserver sentudp failedtcp |
208 | * |
209 | * udp NONE null >=0 0 zero zero |
210 | * udp timew null >=0 any nonzero zero |
211 | * udp NONE null >=0 any nonzero zero |
212 | * |
213 | * tcpwait timew null >=0 irrelevant zero any |
214 | * tcpsent timew null >=0 irrelevant zero any |
215 | * |
216 | * child childw set >=0 irrelevant irrelevant irrelevant |
217 | * done output null -1 irrelevant irrelevant irrelevant |
ddfda861 |
218 | * |
219 | * +------------------------+ |
220 | * START -----> | udp/NONE | |
221 | * +------------------------+ |
222 | * / |\ \ |
223 | * too big for UDP / UDP timeout \ \ send via UDP |
224 | * do this ASAP! / more retries \ \ do this ASAP! |
225 | * |_ desired \ _| |
226 | * +---------------+ +-----------+ |
227 | * | tcpwait/timew | ____ | udp/timew | |
228 | * +---------------+ \ +-----------+ |
229 | * | ^ | | | |
230 | * TCP conn'd; | | TCP died | | | |
231 | * send via TCP | | more | UDP timeout | | |
232 | * do this ASAP! | | servers | no more | | |
233 | * v | to try | retries | | |
234 | * +---------------+ | desired | | |
235 | * | tcpsent/timew | ____ | | | |
236 | * +---------------+ \| | | |
237 | * \ \ TCP died | TCP | | |
238 | * \ \ no more | timeout / | |
239 | * \ \ servers | / | |
240 | * \ \ to try | / | |
241 | * got \ \ v |_ / got |
242 | * reply \ _| +------------------+ / reply |
243 | * \ | done/output FAIL | / |
244 | * \ +------------------+ / |
245 | * \ / |
246 | * _| |_ |
247 | * (..... got reply ....) |
248 | * / \ |
249 | * need child query/ies / \ no child query |
250 | * / \ |
251 | * |_ _| |
252 | * +--------------+ +----------------+ |
253 | * | child/childw | ----------------> | done/output OK | |
254 | * +--------------+ children done +----------------+ |
37e28fde |
255 | */ |
256 | }; |
257 | |
37e28fde |
258 | struct adns__state { |
37e28fde |
259 | adns_initflags iflags; |
260 | FILE *diagfile; |
36369543 |
261 | int configerrno; |
ddfda861 |
262 | struct { adns_query head, tail; } timew, childw, output; |
4353a5c4 |
263 | int nextid, udpsocket, tcpsocket; |
8e5b0abb |
264 | vbuf tcpsend, tcprecv; |
09957b1c |
265 | int nservers, nsortlist, tcpserver; |
8402e34c |
266 | enum adns__tcpstate { server_disconnected, server_connecting, server_ok } tcpstate; |
37e28fde |
267 | struct timeval tcptimeout; |
5ed1b7e7 |
268 | adns_rr_addr servers[MAXSERVERS]; /* port fields will be 53 here */ |
09957b1c |
269 | struct sortlist { |
5ed1b7e7 |
270 | struct in_addr6 base, mask; |
09957b1c |
271 | } sortlist[MAXSORTLIST]; |
37e28fde |
272 | }; |
273 | |
274 | /* From setup.c: */ |
275 | |
e576be50 |
276 | int adns__setnonblock(adns_state ads, int fd); /* => errno value */ |
277 | |
278 | /* From general.c: */ |
279 | |
4353a5c4 |
280 | void adns__vdiag(adns_state ads, const char *pfx, adns_initflags prevent, |
68442019 |
281 | int serv, adns_query qu, const char *fmt, va_list al); |
31144a72 |
282 | |
283 | void adns__debug(adns_state ads, int serv, adns_query qu, |
68442019 |
284 | const char *fmt, ...) PRINTFFORMAT(4,5); |
31144a72 |
285 | void adns__warn(adns_state ads, int serv, adns_query qu, |
68442019 |
286 | const char *fmt, ...) PRINTFFORMAT(4,5); |
31144a72 |
287 | void adns__diag(adns_state ads, int serv, adns_query qu, |
68442019 |
288 | const char *fmt, ...) PRINTFFORMAT(4,5); |
37e28fde |
289 | |
4353a5c4 |
290 | int adns__vbuf_ensure(vbuf *vb, int want); |
9557e604 |
291 | int adns__vbuf_appendstr(vbuf *vb, const char *data); /* does not include nul */ |
4353a5c4 |
292 | int adns__vbuf_append(vbuf *vb, const byte *data, int len); |
ddfda861 |
293 | /* 1=>success, 0=>realloc failed */ |
4353a5c4 |
294 | void adns__vbuf_appendq(vbuf *vb, const byte *data, int len); |
295 | void adns__vbuf_init(vbuf *vb); |
8e5b0abb |
296 | void adns__vbuf_free(vbuf *vb); |
4353a5c4 |
297 | |
828d89bd |
298 | const char *adns__diag_domain(adns_state ads, int serv, adns_query qu, |
299 | vbuf *vb, const byte *dgram, int dglen, int cbyte); |
e576be50 |
300 | /* Unpicks a domain in a datagram and returns a string suitable for |
301 | * printing it as. Never fails - if an error occurs, it will |
302 | * return some kind of string describing the error. |
303 | * |
3955725c |
304 | * serv may be -1 and qu may be 0. vb must have been initialised, |
e576be50 |
305 | * and will be left in an arbitrary consistent state. |
306 | * |
307 | * Returns either vb->buf, or a pointer to a string literal. Do not modify |
308 | * vb before using the return value. |
309 | */ |
310 | |
88372443 |
311 | void adns__isort(void *array, int nobjs, int sz, void *tempbuf, |
09957b1c |
312 | int (*needswap)(void *context, const void *a, const void *b), |
313 | void *context); |
88372443 |
314 | /* Does an insertion sort of array which must contain nobjs objects |
315 | * each sz bytes long. tempbuf must point to a buffer at least |
316 | * sz bytes long. needswap should return !0 if a>b (strictly, ie |
317 | * wrong order) 0 if a<=b (ie, order is fine). |
318 | */ |
319 | |
e576be50 |
320 | /* From transmit.c: */ |
ddfda861 |
321 | |
3955725c |
322 | adns_status adns__mkquery(adns_state ads, vbuf *vb, int *id_r, |
323 | const char *owner, int ol, |
e576be50 |
324 | const typeinfo *typei, adns_queryflags flags); |
325 | /* Assembles a query packet in vb, and returns id at *id_r. */ |
326 | |
e062dcae |
327 | adns_status adns__mkquery_frdgram(adns_state ads, vbuf *vb, int *id_r, |
328 | const byte *qd_dgram, int qd_dglen, int qd_begin, |
329 | adns_rrtype type, adns_queryflags flags); |
330 | /* Same as adns__mkquery, but takes the owner domain from an existing datagram. |
331 | * That domain must be correct and untruncated. |
332 | */ |
333 | |
5ed1b7e7 |
334 | adns_status adns__subquery(adns_state ads, adns_query parent, vbuf *vb, |
335 | const byte *qd_dgram, int qd_dglen, int qd_begin, |
336 | adns_rrtype type, adns_queryflags flags, |
337 | struct timeval now, const qcontext *ctx); |
338 | /* Constructs a query datagram using _mkquery_frdgram, as above, and then |
339 | * makes the query an internal one with parent qu and sends it off. |
340 | * vbuf is used as a buffer to construct the query, and will be overwritten. |
341 | */ |
342 | |
3955725c |
343 | void adns__query_tcp(adns_query qu, struct timeval now); |
e576be50 |
344 | /* Query must be in state tcpwait/timew; it will be moved to a new state |
345 | * if possible and no further processing can be done on it for now. |
346 | * (Resulting state is one of tcpwait/timew (if server not connected), |
347 | * tcpsent/timew, child/childw or done/output.) |
348 | * |
349 | * adns__tcp_tryconnect should already have been called - _tcp |
350 | * will only use an existing connection (if there is one), which it |
5ed1b7e7 |
351 | * may break. If the conn is lost then the caller is responsible for any |
e576be50 |
352 | * reestablishment and retry. |
353 | */ |
354 | |
3955725c |
355 | void adns__query_udp(adns_query qu, struct timeval now); |
e576be50 |
356 | /* Query must be in state udp/NONE; it will be moved to a new state, |
357 | * and no further processing can be done on it for now. |
358 | * (Resulting state is one of udp/timew, tcpwait/timew (if server not connected), |
359 | * tcpsent/timew, child/childw or done/output.) |
360 | */ |
361 | |
362 | /* From query.c: */ |
37e28fde |
363 | |
8e5b0abb |
364 | int adns__internal_submit(adns_state ads, adns_query *query_r, |
3955725c |
365 | const typeinfo *typei, vbuf *qumsg_vb, int id, |
8e5b0abb |
366 | adns_queryflags flags, struct timeval now, |
367 | adns_status failstat, const qcontext *ctx); |
368 | /* Submits a query (for internal use, called during external submits). |
369 | * |
370 | * The new query is returned in *query_r, or we return adns_s_nomemory. |
371 | * |
68442019 |
372 | * The query datagram should already have been assembled in qumsg_vb; |
373 | * the memory for it is _taken over_ by this routine whether it |
374 | * succeeds or fails (if it succeeds, the vbuf is reused for qu->vb). |
8e5b0abb |
375 | * |
376 | * If failstat is nonzero then if we are successful in creating the query |
377 | * it is immediately failed with code failstat (but _submit still succeds). |
378 | * |
7da21070 |
379 | * *ctx is copied byte-for-byte into the query. |
8e5b0abb |
380 | */ |
381 | |
382 | void *adns__alloc_interim(adns_query qu, size_t sz); |
383 | /* Allocates some memory, and records which query it came from |
384 | * and how much there was. |
385 | * |
386 | * If an error occurs in the query, all its memory is simply freed. |
387 | * |
388 | * If the query succeeds, one large buffer will be made which is |
389 | * big enough for all these allocations, and then adns__alloc_final |
390 | * will get memory from this buffer. |
391 | * |
e062dcae |
392 | * _alloc_interim can fail (and return 0). |
393 | * The caller must ensure that the query is failed. |
a49a6d7b |
394 | * |
e062dcae |
395 | * adns__alloc_interim_{only,fail}(qu,0) will not return 0, |
396 | * but it will not necessarily return a distinct pointer each time. |
8e5b0abb |
397 | */ |
398 | |
551ff40f |
399 | void adns__transfer_interim(adns_query from, adns_query to, void *block, size_t sz); |
400 | /* Transfers an interim allocation from one query to another, so that |
401 | * the `to' query will have room for the data when we get to makefinal |
402 | * and so that the free will happen when the `to' query is freed |
403 | * rather than the `from' query. |
404 | * |
405 | * It is legal to call adns__transfer_interim with a null pointer; this |
406 | * has no effect. |
407 | */ |
408 | |
3955725c |
409 | void *adns__alloc_mine(adns_query qu, size_t sz); |
410 | /* Like _interim, but does not record the length for later |
411 | * copying into the answer. This just ensures that the memory |
412 | * will be freed when we're done with the query. |
413 | */ |
414 | |
8e5b0abb |
415 | void *adns__alloc_final(adns_query qu, size_t sz); |
a49a6d7b |
416 | /* Cannot fail, and cannot return 0. |
8e5b0abb |
417 | */ |
37e28fde |
418 | |
68442019 |
419 | void adns__makefinal_block(adns_query qu, void **blpp, size_t sz); |
420 | void adns__makefinal_str(adns_query qu, char **strp); |
421 | |
3955725c |
422 | void adns__reset_cnameonly(adns_query qu); |
68442019 |
423 | /* Resets all of the memory management stuff etc. to |
424 | * take account of only the CNAME. Used when we find an error somewhere |
425 | * and want to just report the error (with perhaps CNAME info), and also |
426 | * when we're halfway through RRs in a datagram and discover that we |
427 | * need to retry the query. |
428 | */ |
e576be50 |
429 | |
3955725c |
430 | void adns__query_done(adns_query qu); |
431 | void adns__query_fail(adns_query qu, adns_status stat); |
68442019 |
432 | |
4353a5c4 |
433 | /* From reply.c: */ |
434 | |
98a3f706 |
435 | void adns__procdgram(adns_state ads, const byte *dgram, int len, |
436 | int serv, struct timeval now); |
437 | |
438 | /* From types.c: */ |
439 | |
440 | const typeinfo *adns__findtype(adns_rrtype type); |
441 | |
442 | /* From parse.c: */ |
443 | |
f1e474dd |
444 | typedef struct { |
68442019 |
445 | adns_state ads; |
3955725c |
446 | adns_query qu; |
68442019 |
447 | int serv; |
f1e474dd |
448 | const byte *dgram; |
449 | int dglen, max, cbyte, namelen; |
3955725c |
450 | int *dmend_r; |
f1e474dd |
451 | } findlabel_state; |
452 | |
3955725c |
453 | void adns__findlabel_start(findlabel_state *fls, adns_state ads, |
454 | int serv, adns_query qu, |
f1e474dd |
455 | const byte *dgram, int dglen, int max, |
456 | int dmbegin, int *dmend_rlater); |
457 | /* Finds labels in a domain in a datagram. |
458 | * |
459 | * Call this routine first. |
3955725c |
460 | * dmend_rlater may be null. ads (and of course fls) may not be. |
461 | * serv may be -1, qu may be null - they are for error reporting. |
f1e474dd |
462 | */ |
463 | |
3955725c |
464 | adns_status adns__findlabel_next(findlabel_state *fls, int *lablen_r, int *labstart_r); |
f1e474dd |
465 | /* Then, call this one repeatedly. |
466 | * |
467 | * It will return adns_s_ok if all is well, and tell you the length |
468 | * and start of successive labels. labstart_r may be null, but |
469 | * lablen_r must not be. |
470 | * |
471 | * After the last label, it will return with *lablen_r zero. |
472 | * Do not then call it again; instead, just throw away the findlabel_state. |
473 | * |
474 | * *dmend_rlater will have been set to point to the next part of |
475 | * the datagram after the label (or after the uncompressed part, |
476 | * if compression was used). *namelen_rlater will have been set |
477 | * to the length of the domain name (total length of labels plus |
478 | * 1 for each intervening dot). |
479 | * |
480 | * If the datagram appears to be truncated, *lablen_r will be -1. |
481 | * *dmend_rlater, *labstart_r and *namelen_r may contain garbage. |
482 | * Do not call _next again. |
483 | * |
484 | * There may also be errors, in which case *dmend_rlater, |
485 | * *namelen_rlater, *lablen_r and *labstart_r may contain garbage. |
486 | * Do not then call findlabel_next again. |
487 | */ |
488 | |
828d89bd |
489 | typedef enum { |
490 | pdf_quoteok= 0x001 |
491 | } parsedomain_flags; |
492 | |
3955725c |
493 | adns_status adns__parse_domain(adns_state ads, int serv, adns_query qu, |
828d89bd |
494 | vbuf *vb, parsedomain_flags flags, |
3955725c |
495 | const byte *dgram, int dglen, int *cbyte_io, int max); |
f1e474dd |
496 | /* vb must already have been initialised; it will be reset if necessary. |
497 | * If there is truncation, vb->used will be set to 0; otherwise |
498 | * (if there is no error) vb will be null-terminated. |
499 | * If there is an error vb and *cbyte_io may be left indeterminate. |
3955725c |
500 | * |
501 | * serv may be -1 and qu may be 0 - they are used for error reporting only. |
f1e474dd |
502 | */ |
503 | |
3955725c |
504 | adns_status adns__findrr(adns_query qu, int serv, |
f1e474dd |
505 | const byte *dgram, int dglen, int *cbyte_io, |
506 | int *type_r, int *class_r, int *rdlen_r, int *rdstart_r, |
3955725c |
507 | int *ownermatchedquery_r); |
c7836bc9 |
508 | /* Finds the extent and some of the contents of an RR in a datagram |
509 | * and does some checks. The datagram is *dgram, length dglen, and |
510 | * the RR starts at *cbyte_io (which is updated afterwards to point |
511 | * to the end of the RR). |
512 | * |
513 | * The type, class and RRdata length and start are returned iff |
514 | * the corresponding pointer variables are not null. type_r and |
515 | * class_r may not be null. |
516 | * |
517 | * If ownermatchedquery_r != 0 then the owner domain of this |
518 | * RR will be compared with that in the query (or, if the query |
519 | * has gone to a CNAME lookup, with the canonical name). |
520 | * In this case, *ownermatchedquery_r will be set to 0 or 1. |
521 | * The query datagram (or CNAME datagram) MUST be valid and not truncated. |
522 | * |
523 | * If there is truncation then *type_r will be set to -1 and |
524 | * *cbyte_io, *class_r, *rdlen_r, *rdstart_r and *eo_matched_r will be |
525 | * undefined. |
526 | * |
527 | * qu must obviously be non-null. |
528 | * |
529 | * If an error is returned then *type_r will be undefined too. |
530 | */ |
531 | |
1dfe95d8 |
532 | adns_status adns__findrr_anychk(adns_query qu, int serv, |
533 | const byte *dgram, int dglen, int *cbyte_io, |
534 | int *type_r, int *class_r, int *rdlen_r, int *rdstart_r, |
535 | const byte *eo_dgram, int eo_dglen, int eo_cbyte, |
536 | int *eo_matched_r); |
c7836bc9 |
537 | /* Like adns__findrr_checked, except that the datagram and |
538 | * owner to compare with can be specified explicitly. |
539 | * |
540 | * If the caller thinks they know what the owner of the RR ought to |
541 | * be they can pass in details in eo_*: this is another (or perhaps |
542 | * the same datagram), and a pointer to where the putative owner |
543 | * starts in that datagram. In this case *eo_matched_r will be set |
544 | * to 1 if the datagram matched or 0 if it did not. Either |
545 | * both eo_dgram and eo_matched_r must both be non-null, or they |
546 | * must both be null (in which case eo_dglen and eo_cbyte will be ignored). |
547 | * The eo datagram and contained owner domain MUST be valid and |
548 | * untruncated. |
549 | */ |
98a3f706 |
550 | |
f1e474dd |
551 | int vbuf__append_quoted1035(vbuf *vb, const byte *buf, int len); |
8402e34c |
552 | |
553 | /* From event.c: */ |
4353a5c4 |
554 | |
8402e34c |
555 | void adns__tcp_broken(adns_state ads, const char *what, const char *why); |
4353a5c4 |
556 | void adns__tcp_tryconnect(adns_state ads, struct timeval now); |
e576be50 |
557 | |
4353a5c4 |
558 | void adns__autosys(adns_state ads, struct timeval now); |
e576be50 |
559 | /* Make all the system calls we want to if the application wants us to. */ |
37e28fde |
560 | |
561 | /* Useful static inline functions: */ |
562 | |
563 | static inline void timevaladd(struct timeval *tv_io, long ms) { |
564 | struct timeval tmp; |
565 | assert(ms>=0); |
566 | tmp= *tv_io; |
94436798 |
567 | tmp.tv_usec += (ms%1000)*1000000; |
37e28fde |
568 | tmp.tv_sec += ms/1000; |
94436798 |
569 | if (tmp.tv_usec >= 1000000) { tmp.tv_sec++; tmp.tv_usec -= 1000; } |
37e28fde |
570 | *tv_io= tmp; |
ddfda861 |
571 | } |
37e28fde |
572 | |
573 | static inline int ctype_whitespace(int c) { return c==' ' || c=='\n' || c=='\t'; } |
574 | static inline int ctype_digit(int c) { return c>='0' && c<='9'; } |
98a3f706 |
575 | static inline int ctype_alpha(int c) { |
576 | return (c >= 'a' && c <= 'z') || (c >= 'A' || c <= 'Z'); |
577 | } |
37e28fde |
578 | |
579 | /* Useful macros */ |
580 | |
8e5b0abb |
581 | #define MEM_ROUND(sz) \ |
582 | (( ((sz)+sizeof(union maxalign)-1) / sizeof(union maxalign) ) \ |
583 | * sizeof(union maxalign) ) |
584 | |
4353a5c4 |
585 | #define LIST_INIT(list) ((list).head= (list).tail= 0) |
586 | |
37e28fde |
587 | #define LIST_UNLINK_PART(list,node,part) \ |
588 | do { \ |
551ff40f |
589 | if ((node)->part back) (node)->part back->part next= (node)->part next; \ |
590 | else (list).head= (node)->part next; \ |
591 | if ((node)->part next) (node)->part next->part back= (node)->part back; \ |
592 | else (list).tail= (node)->part back; \ |
37e28fde |
593 | } while(0) |
594 | |
595 | #define LIST_LINK_TAIL_PART(list,node,part) \ |
596 | do { \ |
86e7b8d9 |
597 | (node)->part next= 0; \ |
598 | (node)->part back= (list).tail; \ |
7da21070 |
599 | if ((list).tail) (list).tail->part next= (node); else (list).head= (node); \ |
37e28fde |
600 | (list).tail= (node); \ |
601 | } while(0) |
602 | |
603 | #define LIST_UNLINK(list,node) LIST_UNLINK_PART(list,node,) |
4353a5c4 |
604 | #define LIST_LINK_TAIL(list,node) LIST_LINK_TAIL_PART(list,node,) |
37e28fde |
605 | |
86e7b8d9 |
606 | #define GETIL_B(cb) (((dgram)[(cb)++]) & 0x0ff) |
98a3f706 |
607 | #define GET_B(cb,tv) ((tv)= GETIL_B((cb))) |
608 | #define GET_W(cb,tv) ((tv)=0, (tv)|=(GETIL_B((cb))<<8), (tv)|=GETIL_B(cb), (tv)) |
609 | |
37e28fde |
610 | #endif |