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 | |
199 | adns_status adns_rr_info(adns_rrtype type, |
200 | const char **rrtname_r, const char **fmtname_r, |
201 | int *len_r, |
202 | const void *datap, char **data_r) { |
203 | const typeinfo *typei; |
204 | vbuf vb; |
205 | adns_status st; |
206 | |
207 | typei= adns__findtype(type); |
ea1e31e3 |
208 | if (!typei) return adns_s_unknownrrtype; |
86e7b8d9 |
209 | |
210 | if (rrtname_r) *rrtname_r= typei->rrtname; |
211 | if (fmtname_r) *fmtname_r= typei->fmtname; |
212 | if (len_r) *len_r= typei->rrsz; |
213 | |
214 | if (!datap) return adns_s_ok; |
215 | |
216 | adns__vbuf_init(&vb); |
217 | st= typei->convstring(&vb,datap); |
218 | if (st) goto x_freevb; |
ea1e31e3 |
219 | if (!adns__vbuf_append(&vb,"",1)) { st= adns_s_nomemory; goto x_freevb; } |
86e7b8d9 |
220 | assert(strlen(vb.buf) == vb.used-1); |
221 | *data_r= realloc(vb.buf,vb.used); |
222 | if (!*data_r) *data_r= vb.buf; |
223 | return adns_s_ok; |
224 | |
225 | x_freevb: |
226 | adns__vbuf_free(&vb); |
227 | return st; |
228 | } |
229 | |
ac77ffc1 |
230 | |
9da4a044 |
231 | #define SINFO(n,s) { adns_s_##n, #n, s } |
86e7b8d9 |
232 | |
233 | static const struct sinfo { |
234 | adns_status st; |
9da4a044 |
235 | const char *abbrev; |
86e7b8d9 |
236 | const char *string; |
237 | } sinfos[]= { |
609133ee |
238 | SINFO( ok, "OK" ), |
239 | |
240 | SINFO( nomemory, "Out of memory" ), |
241 | SINFO( unknownrrtype, "Query not implemented in DNS library" ), |
242 | SINFO( systemfail, "General resolver or system failure" ), |
243 | |
244 | SINFO( timeout, "DNS query timed out" ), |
245 | SINFO( allservfail, "All nameservers failed" ), |
246 | SINFO( norecurse, "Recursion denied by nameserver" ), |
247 | SINFO( invalidresponse, "Nameserver sent bad response" ), |
248 | SINFO( unknownformat, "Nameserver used unknown format" ), |
249 | |
250 | SINFO( rcodeservfail, "Nameserver reports failure" ), |
251 | SINFO( rcodeformaterror, "Query not understood by nameserver" ), |
252 | SINFO( rcodenotimplemented, "Query not implemented by nameserver" ), |
253 | SINFO( rcoderefused, "Query refused by nameserver" ), |
254 | SINFO( rcodeunknown, "Nameserver sent unknown response code" ), |
255 | |
256 | SINFO( inconsistent, "Inconsistent resource records in DNS" ), |
257 | SINFO( prohibitedcname, "DNS alias found where canonical name wanted" ), |
258 | SINFO( answerdomaininvalid, "Found syntactically invalid domain name" ), |
259 | SINFO( answerdomaintoolong, "Found overly-long domain name" ), |
260 | SINFO( invaliddata, "Found invalid DNS data" ), |
261 | |
262 | SINFO( querydomainwrong, "Domain invalid for particular DNS query type" ), |
263 | SINFO( querydomaininvalid, "Domain name is syntactically invalid" ), |
264 | SINFO( querydomaintoolong, "Domain name or component is too long" ), |
265 | |
266 | SINFO( nxdomain, "No such domain" ), |
267 | SINFO( nodata, "No such data" ) |
86e7b8d9 |
268 | }; |
269 | |
270 | static int si_compar(const void *key, const void *elem) { |
271 | const adns_status *st= key; |
272 | const struct sinfo *si= elem; |
273 | |
274 | return *st < si->st ? -1 : *st > si->st ? 1 : 0; |
275 | } |
276 | |
9da4a044 |
277 | static const struct sinfo *findsinfo(adns_status st) { |
609133ee |
278 | return bsearch(&st,sinfos, sizeof(sinfos)/sizeof(*sinfos), |
279 | sizeof(*sinfos), si_compar); |
9da4a044 |
280 | } |
281 | |
e576be50 |
282 | const char *adns_strerror(adns_status st) { |
9da4a044 |
283 | const struct sinfo *si; |
86e7b8d9 |
284 | |
9da4a044 |
285 | si= findsinfo(st); |
286 | return si->string; |
287 | } |
288 | |
289 | const char *adns_errabbrev(adns_status st) { |
86e7b8d9 |
290 | const struct sinfo *si; |
291 | |
9da4a044 |
292 | si= findsinfo(st); |
293 | return si->abbrev; |
e576be50 |
294 | } |
88372443 |
295 | |
ac77ffc1 |
296 | |
297 | #define STINFO(max) { adns_s_max_##max, #max } |
298 | |
299 | static const struct stinfo { |
300 | adns_status stmax; |
301 | const char *abbrev; |
302 | } stinfos[]= { |
303 | { adns_s_ok, "ok" }, |
304 | STINFO( localfail ), |
305 | STINFO( remotefail ), |
306 | STINFO( tempfail ), |
307 | STINFO( misconfig ), |
308 | STINFO( misquery ), |
309 | STINFO( permfail ) |
310 | }; |
311 | |
312 | static int sti_compar(const void *key, const void *elem) { |
313 | const adns_status *st= key; |
314 | const struct stinfo *sti= elem; |
315 | |
316 | adns_status here, min, max; |
317 | |
318 | here= *st; |
319 | min= (sti==stinfos) ? 0 : sti[-1].stmax+1; |
320 | max= sti->stmax; |
321 | |
322 | return here < min ? -1 : here > max ? 1 : 0; |
323 | } |
324 | |
325 | const char *adns_errtypeabbrev(adns_status st) { |
326 | const struct stinfo *sti; |
327 | |
609133ee |
328 | sti= bsearch(&st,stinfos, sizeof(stinfos)/sizeof(*stinfos), |
329 | sizeof(*stinfos), sti_compar); |
ac77ffc1 |
330 | return sti->abbrev; |
331 | } |
332 | |
333 | |
88372443 |
334 | void adns__isort(void *array, int nobjs, int sz, void *tempbuf, |
09957b1c |
335 | int (*needswap)(void *context, const void *a, const void *b), |
336 | void *context) { |
88372443 |
337 | byte *data= array; |
338 | int i, place; |
339 | |
340 | for (i=0; i<nobjs; i++) { |
09957b1c |
341 | for (place= i; |
342 | place>0 && needswap(context, data + (place-1)*sz, data + i*sz); |
343 | place--); |
88372443 |
344 | if (place != i) { |
345 | memcpy(tempbuf, data + i*sz, sz); |
346 | memmove(data + (place+1)*sz, data + place*sz, (i-place)*sz); |
347 | memcpy(data + place*sz, tempbuf, sz); |
348 | } |
349 | } |
350 | } |
ac868fa8 |
351 | |
352 | /* SIGPIPE protection. */ |
353 | |
354 | void adns__sigpipe_protect(adns_state ads) { |
355 | sigset_t toblock; |
356 | struct sigaction sa; |
357 | int r; |
358 | |
359 | if (ads->iflags & adns_if_nosigpipe) return; |
360 | |
361 | sigfillset(&toblock); |
362 | sigdelset(&toblock,SIGPIPE); |
363 | |
364 | sa.sa_handler= SIG_IGN; |
365 | sigfillset(&sa.sa_mask); |
366 | sa.sa_flags= 0; |
367 | |
368 | r= sigprocmask(SIG_SETMASK,&toblock,&ads->stdsigmask); assert(!r); |
369 | r= sigaction(SIGPIPE,&sa,&ads->stdsigpipe); assert(!r); |
370 | } |
371 | |
372 | void adns__sigpipe_unprotect(adns_state ads) { |
373 | int r; |
374 | |
375 | if (ads->iflags & adns_if_nosigpipe) return; |
376 | |
377 | r= sigaction(SIGPIPE,&ads->stdsigpipe,0); assert(!r); |
378 | r= sigprocmask(SIG_SETMASK,&ads->stdsigmask,0); assert(!r); |
379 | } |