Commit | Line | Data |
---|---|---|
e576be50 | 1 | /* |
2 | * general.c | |
3 | * - diagnostic functions | |
4 | * - vbuf handling | |
5 | */ | |
6 | /* | |
ae8cc977 | 7 | * This file is part of adns, which is |
8 | * Copyright (C) 1997-2000,2003,2006 Ian Jackson | |
9 | * Copyright (C) 1999-2000,2003,2006 Tony Finch | |
10 | * Copyright (C) 1991 Massachusetts Institute of Technology | |
11 | * (See the file INSTALL for full details.) | |
e576be50 | 12 | * |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2, or (at your option) | |
16 | * any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software Foundation, | |
25 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
26 | */ | |
27 | ||
3955725c | 28 | #include <stdlib.h> |
5f67bb7b | 29 | #include <unistd.h> |
3955725c | 30 | |
0f091044 | 31 | #include <sys/types.h> |
eec1d9c8 | 32 | #include <sys/socket.h> |
33 | #include <netinet/in.h> | |
3955725c | 34 | #include <arpa/inet.h> |
35 | ||
e576be50 | 36 | #include "internal.h" |
37 | ||
38 | /* Core diagnostic functions */ | |
39 | ||
d3a102c4 | 40 | void adns__vlprintf(adns_state ads, const char *fmt, va_list al) { |
41 | ads->logfn(ads,ads->logfndata,fmt,al); | |
42 | } | |
43 | ||
44 | void adns__lprintf(adns_state ads, const char *fmt, ...) { | |
45 | va_list al; | |
46 | va_start(al,fmt); | |
47 | adns__vlprintf(ads,fmt,al); | |
48 | va_end(al); | |
49 | } | |
50 | ||
e576be50 | 51 | void adns__vdiag(adns_state ads, const char *pfx, adns_initflags prevent, |
3955725c | 52 | int serv, adns_query qu, const char *fmt, va_list al) { |
e576be50 | 53 | const char *bef, *aft; |
54 | vbuf vb; | |
36369543 | 55 | |
d3a102c4 | 56 | if (!ads->logfn || |
609133ee | 57 | (!(ads->iflags & adns_if_debug) |
58 | && (!prevent || (ads->iflags & prevent)))) | |
36369543 | 59 | return; |
e576be50 | 60 | |
5f67bb7b | 61 | if (ads->iflags & adns_if_logpid) { |
d3a102c4 | 62 | adns__lprintf(ads,"adns%s [%ld]: ",pfx,(long)getpid()); |
5f67bb7b | 63 | } else { |
d3a102c4 | 64 | adns__lprintf(ads,"adns%s: ",pfx); |
5f67bb7b | 65 | } |
e576be50 | 66 | |
d3a102c4 | 67 | adns__vlprintf(ads,fmt,al); |
e576be50 | 68 | |
69 | bef= " ("; | |
70 | aft= "\n"; | |
71 | ||
72 | if (qu && qu->query_dgram) { | |
73 | adns__vbuf_init(&vb); | |
d3a102c4 | 74 | adns__lprintf(ads,"%sQNAME=%s, QTYPE=%s", |
e576be50 | 75 | bef, |
828d89bd | 76 | adns__diag_domain(qu->ads,-1,0, &vb, |
3955725c | 77 | qu->query_dgram,qu->query_dglen,DNS_HDRSIZE), |
86e7b8d9 | 78 | qu->typei ? qu->typei->rrtname : "<unknown>"); |
79 | if (qu->typei && qu->typei->fmtname) | |
d3a102c4 | 80 | adns__lprintf(ads,"(%s)",qu->typei->fmtname); |
e576be50 | 81 | bef=", "; aft=")\n"; |
914a5ff5 | 82 | adns__vbuf_free(&vb); |
e576be50 | 83 | } |
84 | ||
85 | if (serv>=0) { | |
d3a102c4 | 86 | adns__lprintf(ads,"%sNS=%s",bef,inet_ntoa(ads->servers[serv].addr)); |
e576be50 | 87 | bef=", "; aft=")\n"; |
88 | } | |
89 | ||
d3a102c4 | 90 | adns__lprintf(ads,"%s",aft); |
e576be50 | 91 | } |
92 | ||
609133ee | 93 | void adns__debug(adns_state ads, int serv, adns_query qu, |
94 | const char *fmt, ...) { | |
e576be50 | 95 | va_list al; |
96 | ||
97 | va_start(al,fmt); | |
98 | adns__vdiag(ads," debug",0,serv,qu,fmt,al); | |
99 | va_end(al); | |
100 | } | |
101 | ||
609133ee | 102 | void adns__warn(adns_state ads, int serv, adns_query qu, |
103 | const char *fmt, ...) { | |
e576be50 | 104 | va_list al; |
105 | ||
106 | va_start(al,fmt); | |
609133ee | 107 | adns__vdiag(ads," warning", |
108 | adns_if_noerrprint|adns_if_noserverwarn, serv,qu,fmt,al); | |
e576be50 | 109 | va_end(al); |
110 | } | |
111 | ||
609133ee | 112 | void adns__diag(adns_state ads, int serv, adns_query qu, |
113 | const char *fmt, ...) { | |
e576be50 | 114 | va_list al; |
115 | ||
116 | va_start(al,fmt); | |
117 | adns__vdiag(ads,"",adns_if_noerrprint,serv,qu,fmt,al); | |
118 | va_end(al); | |
119 | } | |
120 | ||
121 | /* vbuf functions */ | |
122 | ||
123 | void adns__vbuf_init(vbuf *vb) { | |
124 | vb->used= vb->avail= 0; vb->buf= 0; | |
125 | } | |
126 | ||
127 | int adns__vbuf_ensure(vbuf *vb, int want) { | |
128 | void *nb; | |
129 | ||
130 | if (vb->avail >= want) return 1; | |
131 | nb= realloc(vb->buf,want); if (!nb) return 0; | |
132 | vb->buf= nb; | |
133 | vb->avail= want; | |
134 | return 1; | |
135 | } | |
136 | ||
137 | void adns__vbuf_appendq(vbuf *vb, const byte *data, int len) { | |
138 | memcpy(vb->buf+vb->used,data,len); | |
139 | vb->used+= len; | |
140 | } | |
141 | ||
142 | int adns__vbuf_append(vbuf *vb, const byte *data, int len) { | |
143 | int newlen; | |
144 | void *nb; | |
145 | ||
146 | newlen= vb->used+len; | |
147 | if (vb->avail < newlen) { | |
a49a6d7b | 148 | if (newlen<20) newlen= 20; |
e576be50 | 149 | newlen <<= 1; |
150 | nb= realloc(vb->buf,newlen); | |
a49a6d7b | 151 | if (!nb) { newlen= vb->used+len; nb= realloc(vb->buf,newlen); } |
e576be50 | 152 | if (!nb) return 0; |
153 | vb->buf= nb; | |
154 | vb->avail= newlen; | |
155 | } | |
156 | adns__vbuf_appendq(vb,data,len); | |
157 | return 1; | |
158 | } | |
159 | ||
f759e52e | 160 | int adns__vbuf_appendstr(vbuf *vb, const char *data) { |
161 | int l; | |
9557e604 | 162 | l= strlen(data); |
f759e52e | 163 | return adns__vbuf_append(vb,data,l); |
164 | } | |
165 | ||
a49a6d7b | 166 | void adns__vbuf_free(vbuf *vb) { |
167 | free(vb->buf); | |
168 | adns__vbuf_init(vb); | |
169 | } | |
170 | ||
e576be50 | 171 | /* Additional diagnostic functions */ |
172 | ||
828d89bd | 173 | const char *adns__diag_domain(adns_state ads, int serv, adns_query qu, |
609133ee | 174 | vbuf *vb, const byte *dgram, |
175 | int dglen, int cbyte) { | |
e576be50 | 176 | adns_status st; |
177 | ||
609133ee | 178 | st= adns__parse_domain(ads,serv,qu,vb, pdf_quoteok, |
179 | dgram,dglen,&cbyte,dglen); | |
ea1e31e3 | 180 | if (st == adns_s_nomemory) { |
e576be50 | 181 | return "<cannot report domain... out of memory>"; |
182 | } | |
183 | if (st) { | |
184 | vb->used= 0; | |
185 | if (!(adns__vbuf_appendstr(vb,"<bad format... ") && | |
186 | adns__vbuf_appendstr(vb,adns_strerror(st)) && | |
187 | adns__vbuf_appendstr(vb,">") && | |
188 | adns__vbuf_append(vb,"",1))) { | |
189 | return "<cannot report bad format... out of memory>"; | |
190 | } | |
191 | } | |
3955725c | 192 | if (!vb->used) { |
e576be50 | 193 | adns__vbuf_appendstr(vb,"<truncated ...>"); |
194 | adns__vbuf_append(vb,"",1); | |
195 | } | |
196 | return vb->buf; | |
197 | } | |
86e7b8d9 | 198 | |
042b0909 MW |
199 | int adns__getrrsz_default(const typeinfo *typei, adns_rrtype type) |
200 | { return typei->fixed_rrsz; } | |
201 | ||
86e7b8d9 | 202 | adns_status adns_rr_info(adns_rrtype type, |
203 | const char **rrtname_r, const char **fmtname_r, | |
204 | int *len_r, | |
205 | const void *datap, char **data_r) { | |
206 | const typeinfo *typei; | |
207 | vbuf vb; | |
208 | adns_status st; | |
209 | ||
210 | typei= adns__findtype(type); | |
ea1e31e3 | 211 | if (!typei) return adns_s_unknownrrtype; |
86e7b8d9 | 212 | |
213 | if (rrtname_r) *rrtname_r= typei->rrtname; | |
214 | if (fmtname_r) *fmtname_r= typei->fmtname; | |
042b0909 | 215 | if (len_r) *len_r= typei->getrrsz(typei, type); |
86e7b8d9 | 216 | |
217 | if (!datap) return adns_s_ok; | |
218 | ||
219 | adns__vbuf_init(&vb); | |
220 | st= typei->convstring(&vb,datap); | |
221 | if (st) goto x_freevb; | |
ea1e31e3 | 222 | if (!adns__vbuf_append(&vb,"",1)) { st= adns_s_nomemory; goto x_freevb; } |
86e7b8d9 | 223 | assert(strlen(vb.buf) == vb.used-1); |
224 | *data_r= realloc(vb.buf,vb.used); | |
225 | if (!*data_r) *data_r= vb.buf; | |
226 | return adns_s_ok; | |
227 | ||
228 | x_freevb: | |
229 | adns__vbuf_free(&vb); | |
230 | return st; | |
231 | } | |
232 | ||
ac77ffc1 | 233 | |
9da4a044 | 234 | #define SINFO(n,s) { adns_s_##n, #n, s } |
86e7b8d9 | 235 | |
236 | static const struct sinfo { | |
237 | adns_status st; | |
9da4a044 | 238 | const char *abbrev; |
86e7b8d9 | 239 | const char *string; |
240 | } sinfos[]= { | |
609133ee | 241 | SINFO( ok, "OK" ), |
242 | ||
243 | SINFO( nomemory, "Out of memory" ), | |
244 | SINFO( unknownrrtype, "Query not implemented in DNS library" ), | |
245 | SINFO( systemfail, "General resolver or system failure" ), | |
246 | ||
247 | SINFO( timeout, "DNS query timed out" ), | |
248 | SINFO( allservfail, "All nameservers failed" ), | |
249 | SINFO( norecurse, "Recursion denied by nameserver" ), | |
250 | SINFO( invalidresponse, "Nameserver sent bad response" ), | |
251 | SINFO( unknownformat, "Nameserver used unknown format" ), | |
252 | ||
253 | SINFO( rcodeservfail, "Nameserver reports failure" ), | |
254 | SINFO( rcodeformaterror, "Query not understood by nameserver" ), | |
255 | SINFO( rcodenotimplemented, "Query not implemented by nameserver" ), | |
256 | SINFO( rcoderefused, "Query refused by nameserver" ), | |
257 | SINFO( rcodeunknown, "Nameserver sent unknown response code" ), | |
258 | ||
259 | SINFO( inconsistent, "Inconsistent resource records in DNS" ), | |
260 | SINFO( prohibitedcname, "DNS alias found where canonical name wanted" ), | |
261 | SINFO( answerdomaininvalid, "Found syntactically invalid domain name" ), | |
262 | SINFO( answerdomaintoolong, "Found overly-long domain name" ), | |
263 | SINFO( invaliddata, "Found invalid DNS data" ), | |
264 | ||
265 | SINFO( querydomainwrong, "Domain invalid for particular DNS query type" ), | |
266 | SINFO( querydomaininvalid, "Domain name is syntactically invalid" ), | |
267 | SINFO( querydomaintoolong, "Domain name or component is too long" ), | |
268 | ||
269 | SINFO( nxdomain, "No such domain" ), | |
270 | SINFO( nodata, "No such data" ) | |
86e7b8d9 | 271 | }; |
272 | ||
273 | static int si_compar(const void *key, const void *elem) { | |
274 | const adns_status *st= key; | |
275 | const struct sinfo *si= elem; | |
276 | ||
277 | return *st < si->st ? -1 : *st > si->st ? 1 : 0; | |
278 | } | |
279 | ||
9da4a044 | 280 | static const struct sinfo *findsinfo(adns_status st) { |
609133ee | 281 | return bsearch(&st,sinfos, sizeof(sinfos)/sizeof(*sinfos), |
282 | sizeof(*sinfos), si_compar); | |
9da4a044 | 283 | } |
284 | ||
e576be50 | 285 | const char *adns_strerror(adns_status st) { |
9da4a044 | 286 | const struct sinfo *si; |
86e7b8d9 | 287 | |
9da4a044 | 288 | si= findsinfo(st); |
289 | return si->string; | |
290 | } | |
291 | ||
292 | const char *adns_errabbrev(adns_status st) { | |
86e7b8d9 | 293 | const struct sinfo *si; |
294 | ||
9da4a044 | 295 | si= findsinfo(st); |
296 | return si->abbrev; | |
e576be50 | 297 | } |
88372443 | 298 | |
ac77ffc1 | 299 | |
300 | #define STINFO(max) { adns_s_max_##max, #max } | |
301 | ||
302 | static const struct stinfo { | |
303 | adns_status stmax; | |
304 | const char *abbrev; | |
305 | } stinfos[]= { | |
306 | { adns_s_ok, "ok" }, | |
307 | STINFO( localfail ), | |
308 | STINFO( remotefail ), | |
309 | STINFO( tempfail ), | |
310 | STINFO( misconfig ), | |
311 | STINFO( misquery ), | |
312 | STINFO( permfail ) | |
313 | }; | |
314 | ||
315 | static int sti_compar(const void *key, const void *elem) { | |
316 | const adns_status *st= key; | |
317 | const struct stinfo *sti= elem; | |
318 | ||
319 | adns_status here, min, max; | |
320 | ||
321 | here= *st; | |
322 | min= (sti==stinfos) ? 0 : sti[-1].stmax+1; | |
323 | max= sti->stmax; | |
324 | ||
325 | return here < min ? -1 : here > max ? 1 : 0; | |
326 | } | |
327 | ||
328 | const char *adns_errtypeabbrev(adns_status st) { | |
329 | const struct stinfo *sti; | |
330 | ||
609133ee | 331 | sti= bsearch(&st,stinfos, sizeof(stinfos)/sizeof(*stinfos), |
332 | sizeof(*stinfos), sti_compar); | |
ac77ffc1 | 333 | return sti->abbrev; |
334 | } | |
335 | ||
336 | ||
88372443 | 337 | void adns__isort(void *array, int nobjs, int sz, void *tempbuf, |
09957b1c | 338 | int (*needswap)(void *context, const void *a, const void *b), |
339 | void *context) { | |
88372443 | 340 | byte *data= array; |
341 | int i, place; | |
342 | ||
343 | for (i=0; i<nobjs; i++) { | |
09957b1c | 344 | for (place= i; |
345 | place>0 && needswap(context, data + (place-1)*sz, data + i*sz); | |
346 | place--); | |
88372443 | 347 | if (place != i) { |
348 | memcpy(tempbuf, data + i*sz, sz); | |
349 | memmove(data + (place+1)*sz, data + place*sz, (i-place)*sz); | |
350 | memcpy(data + place*sz, tempbuf, sz); | |
351 | } | |
352 | } | |
353 | } | |
ac868fa8 | 354 | |
355 | /* SIGPIPE protection. */ | |
356 | ||
357 | void adns__sigpipe_protect(adns_state ads) { | |
358 | sigset_t toblock; | |
359 | struct sigaction sa; | |
360 | int r; | |
361 | ||
362 | if (ads->iflags & adns_if_nosigpipe) return; | |
363 | ||
364 | sigfillset(&toblock); | |
365 | sigdelset(&toblock,SIGPIPE); | |
366 | ||
367 | sa.sa_handler= SIG_IGN; | |
368 | sigfillset(&sa.sa_mask); | |
369 | sa.sa_flags= 0; | |
370 | ||
371 | r= sigprocmask(SIG_SETMASK,&toblock,&ads->stdsigmask); assert(!r); | |
372 | r= sigaction(SIGPIPE,&sa,&ads->stdsigpipe); assert(!r); | |
373 | } | |
374 | ||
375 | void adns__sigpipe_unprotect(adns_state ads) { | |
376 | int r; | |
377 | ||
378 | if (ads->iflags & adns_if_nosigpipe) return; | |
379 | ||
380 | r= sigaction(SIGPIPE,&ads->stdsigpipe,0); assert(!r); | |
381 | r= sigprocmask(SIG_SETMASK,&ads->stdsigmask,0); assert(!r); | |
382 | } |