e576be50 |
1 | /* |
2 | * general.c |
3 | * - diagnostic functions |
4 | * - vbuf handling |
5 | */ |
6 | /* |
d942707d |
7 | * This file is |
3d5cde09 |
8 | * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk> |
d942707d |
9 | * |
10 | * It is part of adns, which is |
3d5cde09 |
11 | * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk> |
bef232ae |
12 | * Copyright (C) 1999-2000 Tony Finch <dot@dotat.at> |
e576be50 |
13 | * |
14 | * This program is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2, or (at your option) |
17 | * any later version. |
18 | * |
19 | * This program is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with this program; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
3955725c |
29 | #include <stdlib.h> |
5f67bb7b |
30 | #include <unistd.h> |
3955725c |
31 | |
0f091044 |
32 | #include <sys/types.h> |
eec1d9c8 |
33 | #include <sys/socket.h> |
34 | #include <netinet/in.h> |
3955725c |
35 | #include <arpa/inet.h> |
36 | |
e576be50 |
37 | #include "internal.h" |
38 | |
39 | /* Core diagnostic functions */ |
40 | |
d3a102c4 |
41 | void adns__vlprintf(adns_state ads, const char *fmt, va_list al) { |
42 | ads->logfn(ads,ads->logfndata,fmt,al); |
43 | } |
44 | |
45 | void adns__lprintf(adns_state ads, const char *fmt, ...) { |
46 | va_list al; |
47 | va_start(al,fmt); |
48 | adns__vlprintf(ads,fmt,al); |
49 | va_end(al); |
50 | } |
51 | |
e576be50 |
52 | void adns__vdiag(adns_state ads, const char *pfx, adns_initflags prevent, |
3955725c |
53 | int serv, adns_query qu, const char *fmt, va_list al) { |
e576be50 |
54 | const char *bef, *aft; |
55 | vbuf vb; |
36369543 |
56 | |
d3a102c4 |
57 | if (!ads->logfn || |
609133ee |
58 | (!(ads->iflags & adns_if_debug) |
59 | && (!prevent || (ads->iflags & prevent)))) |
36369543 |
60 | return; |
e576be50 |
61 | |
5f67bb7b |
62 | if (ads->iflags & adns_if_logpid) { |
d3a102c4 |
63 | adns__lprintf(ads,"adns%s [%ld]: ",pfx,(long)getpid()); |
5f67bb7b |
64 | } else { |
d3a102c4 |
65 | adns__lprintf(ads,"adns%s: ",pfx); |
5f67bb7b |
66 | } |
e576be50 |
67 | |
d3a102c4 |
68 | adns__vlprintf(ads,fmt,al); |
e576be50 |
69 | |
70 | bef= " ("; |
71 | aft= "\n"; |
72 | |
73 | if (qu && qu->query_dgram) { |
74 | adns__vbuf_init(&vb); |
d3a102c4 |
75 | adns__lprintf(ads,"%sQNAME=%s, QTYPE=%s", |
e576be50 |
76 | bef, |
828d89bd |
77 | adns__diag_domain(qu->ads,-1,0, &vb, |
3955725c |
78 | qu->query_dgram,qu->query_dglen,DNS_HDRSIZE), |
86e7b8d9 |
79 | qu->typei ? qu->typei->rrtname : "<unknown>"); |
80 | if (qu->typei && qu->typei->fmtname) |
d3a102c4 |
81 | adns__lprintf(ads,"(%s)",qu->typei->fmtname); |
e576be50 |
82 | bef=", "; aft=")\n"; |
914a5ff5 |
83 | adns__vbuf_free(&vb); |
e576be50 |
84 | } |
85 | |
86 | if (serv>=0) { |
d3a102c4 |
87 | adns__lprintf(ads,"%sNS=%s",bef,inet_ntoa(ads->servers[serv].addr)); |
e576be50 |
88 | bef=", "; aft=")\n"; |
89 | } |
90 | |
d3a102c4 |
91 | adns__lprintf(ads,"%s",aft); |
e576be50 |
92 | } |
93 | |
609133ee |
94 | void adns__debug(adns_state ads, int serv, adns_query qu, |
95 | const char *fmt, ...) { |
e576be50 |
96 | va_list al; |
97 | |
98 | va_start(al,fmt); |
99 | adns__vdiag(ads," debug",0,serv,qu,fmt,al); |
100 | va_end(al); |
101 | } |
102 | |
609133ee |
103 | void adns__warn(adns_state ads, int serv, adns_query qu, |
104 | const char *fmt, ...) { |
e576be50 |
105 | va_list al; |
106 | |
107 | va_start(al,fmt); |
609133ee |
108 | adns__vdiag(ads," warning", |
109 | adns_if_noerrprint|adns_if_noserverwarn, serv,qu,fmt,al); |
e576be50 |
110 | va_end(al); |
111 | } |
112 | |
609133ee |
113 | void adns__diag(adns_state ads, int serv, adns_query qu, |
114 | const char *fmt, ...) { |
e576be50 |
115 | va_list al; |
116 | |
117 | va_start(al,fmt); |
118 | adns__vdiag(ads,"",adns_if_noerrprint,serv,qu,fmt,al); |
119 | va_end(al); |
120 | } |
121 | |
122 | /* vbuf functions */ |
123 | |
124 | void adns__vbuf_init(vbuf *vb) { |
125 | vb->used= vb->avail= 0; vb->buf= 0; |
126 | } |
127 | |
128 | int adns__vbuf_ensure(vbuf *vb, int want) { |
129 | void *nb; |
130 | |
131 | if (vb->avail >= want) return 1; |
132 | nb= realloc(vb->buf,want); if (!nb) return 0; |
133 | vb->buf= nb; |
134 | vb->avail= want; |
135 | return 1; |
136 | } |
137 | |
138 | void adns__vbuf_appendq(vbuf *vb, const byte *data, int len) { |
139 | memcpy(vb->buf+vb->used,data,len); |
140 | vb->used+= len; |
141 | } |
142 | |
143 | int adns__vbuf_append(vbuf *vb, const byte *data, int len) { |
144 | int newlen; |
145 | void *nb; |
146 | |
147 | newlen= vb->used+len; |
148 | if (vb->avail < newlen) { |
a49a6d7b |
149 | if (newlen<20) newlen= 20; |
e576be50 |
150 | newlen <<= 1; |
151 | nb= realloc(vb->buf,newlen); |
a49a6d7b |
152 | if (!nb) { newlen= vb->used+len; nb= realloc(vb->buf,newlen); } |
e576be50 |
153 | if (!nb) return 0; |
154 | vb->buf= nb; |
155 | vb->avail= newlen; |
156 | } |
157 | adns__vbuf_appendq(vb,data,len); |
158 | return 1; |
159 | } |
160 | |
f759e52e |
161 | int adns__vbuf_appendstr(vbuf *vb, const char *data) { |
162 | int l; |
9557e604 |
163 | l= strlen(data); |
f759e52e |
164 | return adns__vbuf_append(vb,data,l); |
165 | } |
166 | |
a49a6d7b |
167 | void adns__vbuf_free(vbuf *vb) { |
168 | free(vb->buf); |
169 | adns__vbuf_init(vb); |
170 | } |
171 | |
e576be50 |
172 | /* Additional diagnostic functions */ |
173 | |
828d89bd |
174 | const char *adns__diag_domain(adns_state ads, int serv, adns_query qu, |
609133ee |
175 | vbuf *vb, const byte *dgram, |
176 | int dglen, int cbyte) { |
e576be50 |
177 | adns_status st; |
178 | |
609133ee |
179 | st= adns__parse_domain(ads,serv,qu,vb, pdf_quoteok, |
180 | dgram,dglen,&cbyte,dglen); |
ea1e31e3 |
181 | if (st == adns_s_nomemory) { |
e576be50 |
182 | return "<cannot report domain... out of memory>"; |
183 | } |
184 | if (st) { |
185 | vb->used= 0; |
186 | if (!(adns__vbuf_appendstr(vb,"<bad format... ") && |
187 | adns__vbuf_appendstr(vb,adns_strerror(st)) && |
188 | adns__vbuf_appendstr(vb,">") && |
189 | adns__vbuf_append(vb,"",1))) { |
190 | return "<cannot report bad format... out of memory>"; |
191 | } |
192 | } |
3955725c |
193 | if (!vb->used) { |
e576be50 |
194 | adns__vbuf_appendstr(vb,"<truncated ...>"); |
195 | adns__vbuf_append(vb,"",1); |
196 | } |
197 | return vb->buf; |
198 | } |
86e7b8d9 |
199 | |
200 | adns_status adns_rr_info(adns_rrtype type, |
201 | const char **rrtname_r, const char **fmtname_r, |
202 | int *len_r, |
203 | const void *datap, char **data_r) { |
204 | const typeinfo *typei; |
205 | vbuf vb; |
206 | adns_status st; |
207 | |
208 | typei= adns__findtype(type); |
ea1e31e3 |
209 | if (!typei) return adns_s_unknownrrtype; |
86e7b8d9 |
210 | |
211 | if (rrtname_r) *rrtname_r= typei->rrtname; |
212 | if (fmtname_r) *fmtname_r= typei->fmtname; |
213 | if (len_r) *len_r= typei->rrsz; |
214 | |
215 | if (!datap) return adns_s_ok; |
216 | |
217 | adns__vbuf_init(&vb); |
218 | st= typei->convstring(&vb,datap); |
219 | if (st) goto x_freevb; |
ea1e31e3 |
220 | if (!adns__vbuf_append(&vb,"",1)) { st= adns_s_nomemory; goto x_freevb; } |
86e7b8d9 |
221 | assert(strlen(vb.buf) == vb.used-1); |
222 | *data_r= realloc(vb.buf,vb.used); |
223 | if (!*data_r) *data_r= vb.buf; |
224 | return adns_s_ok; |
225 | |
226 | x_freevb: |
227 | adns__vbuf_free(&vb); |
228 | return st; |
229 | } |
230 | |
ac77ffc1 |
231 | |
9da4a044 |
232 | #define SINFO(n,s) { adns_s_##n, #n, s } |
86e7b8d9 |
233 | |
234 | static const struct sinfo { |
235 | adns_status st; |
9da4a044 |
236 | const char *abbrev; |
86e7b8d9 |
237 | const char *string; |
238 | } sinfos[]= { |
609133ee |
239 | SINFO( ok, "OK" ), |
240 | |
241 | SINFO( nomemory, "Out of memory" ), |
242 | SINFO( unknownrrtype, "Query not implemented in DNS library" ), |
243 | SINFO( systemfail, "General resolver or system failure" ), |
244 | |
245 | SINFO( timeout, "DNS query timed out" ), |
246 | SINFO( allservfail, "All nameservers failed" ), |
247 | SINFO( norecurse, "Recursion denied by nameserver" ), |
248 | SINFO( invalidresponse, "Nameserver sent bad response" ), |
249 | SINFO( unknownformat, "Nameserver used unknown format" ), |
250 | |
251 | SINFO( rcodeservfail, "Nameserver reports failure" ), |
252 | SINFO( rcodeformaterror, "Query not understood by nameserver" ), |
253 | SINFO( rcodenotimplemented, "Query not implemented by nameserver" ), |
254 | SINFO( rcoderefused, "Query refused by nameserver" ), |
255 | SINFO( rcodeunknown, "Nameserver sent unknown response code" ), |
256 | |
257 | SINFO( inconsistent, "Inconsistent resource records in DNS" ), |
258 | SINFO( prohibitedcname, "DNS alias found where canonical name wanted" ), |
259 | SINFO( answerdomaininvalid, "Found syntactically invalid domain name" ), |
260 | SINFO( answerdomaintoolong, "Found overly-long domain name" ), |
261 | SINFO( invaliddata, "Found invalid DNS data" ), |
262 | |
263 | SINFO( querydomainwrong, "Domain invalid for particular DNS query type" ), |
264 | SINFO( querydomaininvalid, "Domain name is syntactically invalid" ), |
265 | SINFO( querydomaintoolong, "Domain name or component is too long" ), |
266 | |
267 | SINFO( nxdomain, "No such domain" ), |
268 | SINFO( nodata, "No such data" ) |
86e7b8d9 |
269 | }; |
270 | |
271 | static int si_compar(const void *key, const void *elem) { |
272 | const adns_status *st= key; |
273 | const struct sinfo *si= elem; |
274 | |
275 | return *st < si->st ? -1 : *st > si->st ? 1 : 0; |
276 | } |
277 | |
9da4a044 |
278 | static const struct sinfo *findsinfo(adns_status st) { |
609133ee |
279 | return bsearch(&st,sinfos, sizeof(sinfos)/sizeof(*sinfos), |
280 | sizeof(*sinfos), si_compar); |
9da4a044 |
281 | } |
282 | |
e576be50 |
283 | const char *adns_strerror(adns_status st) { |
9da4a044 |
284 | const struct sinfo *si; |
86e7b8d9 |
285 | |
9da4a044 |
286 | si= findsinfo(st); |
287 | return si->string; |
288 | } |
289 | |
290 | const char *adns_errabbrev(adns_status st) { |
86e7b8d9 |
291 | const struct sinfo *si; |
292 | |
9da4a044 |
293 | si= findsinfo(st); |
294 | return si->abbrev; |
e576be50 |
295 | } |
88372443 |
296 | |
ac77ffc1 |
297 | |
298 | #define STINFO(max) { adns_s_max_##max, #max } |
299 | |
300 | static const struct stinfo { |
301 | adns_status stmax; |
302 | const char *abbrev; |
303 | } stinfos[]= { |
304 | { adns_s_ok, "ok" }, |
305 | STINFO( localfail ), |
306 | STINFO( remotefail ), |
307 | STINFO( tempfail ), |
308 | STINFO( misconfig ), |
309 | STINFO( misquery ), |
310 | STINFO( permfail ) |
311 | }; |
312 | |
313 | static int sti_compar(const void *key, const void *elem) { |
314 | const adns_status *st= key; |
315 | const struct stinfo *sti= elem; |
316 | |
317 | adns_status here, min, max; |
318 | |
319 | here= *st; |
320 | min= (sti==stinfos) ? 0 : sti[-1].stmax+1; |
321 | max= sti->stmax; |
322 | |
323 | return here < min ? -1 : here > max ? 1 : 0; |
324 | } |
325 | |
326 | const char *adns_errtypeabbrev(adns_status st) { |
327 | const struct stinfo *sti; |
328 | |
609133ee |
329 | sti= bsearch(&st,stinfos, sizeof(stinfos)/sizeof(*stinfos), |
330 | sizeof(*stinfos), sti_compar); |
ac77ffc1 |
331 | return sti->abbrev; |
332 | } |
333 | |
334 | |
88372443 |
335 | void adns__isort(void *array, int nobjs, int sz, void *tempbuf, |
09957b1c |
336 | int (*needswap)(void *context, const void *a, const void *b), |
337 | void *context) { |
88372443 |
338 | byte *data= array; |
339 | int i, place; |
340 | |
341 | for (i=0; i<nobjs; i++) { |
09957b1c |
342 | for (place= i; |
343 | place>0 && needswap(context, data + (place-1)*sz, data + i*sz); |
344 | place--); |
88372443 |
345 | if (place != i) { |
346 | memcpy(tempbuf, data + i*sz, sz); |
347 | memmove(data + (place+1)*sz, data + place*sz, (i-place)*sz); |
348 | memcpy(data + place*sz, tempbuf, sz); |
349 | } |
350 | } |
351 | } |
ac868fa8 |
352 | |
353 | /* SIGPIPE protection. */ |
354 | |
355 | void adns__sigpipe_protect(adns_state ads) { |
356 | sigset_t toblock; |
357 | struct sigaction sa; |
358 | int r; |
359 | |
360 | if (ads->iflags & adns_if_nosigpipe) return; |
361 | |
362 | sigfillset(&toblock); |
363 | sigdelset(&toblock,SIGPIPE); |
364 | |
365 | sa.sa_handler= SIG_IGN; |
366 | sigfillset(&sa.sa_mask); |
367 | sa.sa_flags= 0; |
368 | |
369 | r= sigprocmask(SIG_SETMASK,&toblock,&ads->stdsigmask); assert(!r); |
370 | r= sigaction(SIGPIPE,&sa,&ads->stdsigpipe); assert(!r); |
371 | } |
372 | |
373 | void adns__sigpipe_unprotect(adns_state ads) { |
374 | int r; |
375 | |
376 | if (ads->iflags & adns_if_nosigpipe) return; |
377 | |
378 | r= sigaction(SIGPIPE,&ads->stdsigpipe,0); assert(!r); |
379 | r= sigprocmask(SIG_SETMASK,&ads->stdsigmask,0); assert(!r); |
380 | } |