98db6da3 |
1 | /* |
2 | * general.c |
3 | * - diagnostic functions |
4 | * - vbuf handling |
5 | */ |
6 | /* |
a79ac5ba |
7 | * This file is |
89435c42 |
8 | * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk> |
a79ac5ba |
9 | * |
10 | * It is part of adns, which is |
89435c42 |
11 | * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk> |
c6826df6 |
12 | * Copyright (C) 1999-2000 Tony Finch <dot@dotat.at> |
98db6da3 |
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 | |
11c8bf9b |
29 | #include <stdlib.h> |
a122e99d |
30 | #include <unistd.h> |
11c8bf9b |
31 | |
b6b3ac61 |
32 | #include <sys/types.h> |
29cf9c44 |
33 | #include <sys/socket.h> |
34 | #include <netinet/in.h> |
11c8bf9b |
35 | #include <arpa/inet.h> |
36 | |
98db6da3 |
37 | #include "internal.h" |
38 | |
39 | /* Core diagnostic functions */ |
40 | |
41 | void adns__vdiag(adns_state ads, const char *pfx, adns_initflags prevent, |
11c8bf9b |
42 | int serv, adns_query qu, const char *fmt, va_list al) { |
98db6da3 |
43 | const char *bef, *aft; |
44 | vbuf vb; |
d6b271ae |
45 | |
46 | if (!ads->diagfile || |
9c344a42 |
47 | (!(ads->iflags & adns_if_debug) |
48 | && (!prevent || (ads->iflags & prevent)))) |
d6b271ae |
49 | return; |
98db6da3 |
50 | |
a122e99d |
51 | if (ads->iflags & adns_if_logpid) { |
52 | fprintf(ads->diagfile,"adns%s [%ld]: ",pfx,(long)getpid()); |
53 | } else { |
54 | fprintf(ads->diagfile,"adns%s: ",pfx); |
55 | } |
98db6da3 |
56 | |
d6b271ae |
57 | vfprintf(ads->diagfile,fmt,al); |
98db6da3 |
58 | |
59 | bef= " ("; |
60 | aft= "\n"; |
61 | |
62 | if (qu && qu->query_dgram) { |
63 | adns__vbuf_init(&vb); |
d6b271ae |
64 | fprintf(ads->diagfile,"%sQNAME=%s, QTYPE=%s", |
98db6da3 |
65 | bef, |
cd363ffd |
66 | adns__diag_domain(qu->ads,-1,0, &vb, |
11c8bf9b |
67 | qu->query_dgram,qu->query_dglen,DNS_HDRSIZE), |
1e9efa71 |
68 | qu->typei ? qu->typei->rrtname : "<unknown>"); |
69 | if (qu->typei && qu->typei->fmtname) |
d6b271ae |
70 | fprintf(ads->diagfile,"(%s)",qu->typei->fmtname); |
98db6da3 |
71 | bef=", "; aft=")\n"; |
fc86e61f |
72 | adns__vbuf_free(&vb); |
98db6da3 |
73 | } |
74 | |
75 | if (serv>=0) { |
d6b271ae |
76 | fprintf(ads->diagfile,"%sNS=%s",bef,inet_ntoa(ads->servers[serv].addr)); |
98db6da3 |
77 | bef=", "; aft=")\n"; |
78 | } |
79 | |
d6b271ae |
80 | fputs(aft,ads->diagfile); |
98db6da3 |
81 | } |
82 | |
9c344a42 |
83 | void adns__debug(adns_state ads, int serv, adns_query qu, |
84 | const char *fmt, ...) { |
98db6da3 |
85 | va_list al; |
86 | |
87 | va_start(al,fmt); |
88 | adns__vdiag(ads," debug",0,serv,qu,fmt,al); |
89 | va_end(al); |
90 | } |
91 | |
9c344a42 |
92 | void adns__warn(adns_state ads, int serv, adns_query qu, |
93 | const char *fmt, ...) { |
98db6da3 |
94 | va_list al; |
95 | |
96 | va_start(al,fmt); |
9c344a42 |
97 | adns__vdiag(ads," warning", |
98 | adns_if_noerrprint|adns_if_noserverwarn, serv,qu,fmt,al); |
98db6da3 |
99 | va_end(al); |
100 | } |
101 | |
9c344a42 |
102 | void adns__diag(adns_state ads, int serv, adns_query qu, |
103 | const char *fmt, ...) { |
98db6da3 |
104 | va_list al; |
105 | |
106 | va_start(al,fmt); |
107 | adns__vdiag(ads,"",adns_if_noerrprint,serv,qu,fmt,al); |
108 | va_end(al); |
109 | } |
110 | |
111 | /* vbuf functions */ |
112 | |
113 | void adns__vbuf_init(vbuf *vb) { |
114 | vb->used= vb->avail= 0; vb->buf= 0; |
115 | } |
116 | |
117 | int adns__vbuf_ensure(vbuf *vb, int want) { |
118 | void *nb; |
119 | |
120 | if (vb->avail >= want) return 1; |
121 | nb= realloc(vb->buf,want); if (!nb) return 0; |
122 | vb->buf= nb; |
123 | vb->avail= want; |
124 | return 1; |
125 | } |
126 | |
127 | void adns__vbuf_appendq(vbuf *vb, const byte *data, int len) { |
128 | memcpy(vb->buf+vb->used,data,len); |
129 | vb->used+= len; |
130 | } |
131 | |
132 | int adns__vbuf_append(vbuf *vb, const byte *data, int len) { |
133 | int newlen; |
134 | void *nb; |
135 | |
136 | newlen= vb->used+len; |
137 | if (vb->avail < newlen) { |
f47cdeec |
138 | if (newlen<20) newlen= 20; |
98db6da3 |
139 | newlen <<= 1; |
140 | nb= realloc(vb->buf,newlen); |
f47cdeec |
141 | if (!nb) { newlen= vb->used+len; nb= realloc(vb->buf,newlen); } |
98db6da3 |
142 | if (!nb) return 0; |
143 | vb->buf= nb; |
144 | vb->avail= newlen; |
145 | } |
146 | adns__vbuf_appendq(vb,data,len); |
147 | return 1; |
148 | } |
149 | |
c9afe7bb |
150 | int adns__vbuf_appendstr(vbuf *vb, const char *data) { |
151 | int l; |
9a2b67d4 |
152 | l= strlen(data); |
c9afe7bb |
153 | return adns__vbuf_append(vb,data,l); |
154 | } |
155 | |
f47cdeec |
156 | void adns__vbuf_free(vbuf *vb) { |
157 | free(vb->buf); |
158 | adns__vbuf_init(vb); |
159 | } |
160 | |
98db6da3 |
161 | /* Additional diagnostic functions */ |
162 | |
cd363ffd |
163 | const char *adns__diag_domain(adns_state ads, int serv, adns_query qu, |
9c344a42 |
164 | vbuf *vb, const byte *dgram, |
165 | int dglen, int cbyte) { |
98db6da3 |
166 | adns_status st; |
167 | |
9c344a42 |
168 | st= adns__parse_domain(ads,serv,qu,vb, pdf_quoteok, |
169 | dgram,dglen,&cbyte,dglen); |
9b86645c |
170 | if (st == adns_s_nomemory) { |
98db6da3 |
171 | return "<cannot report domain... out of memory>"; |
172 | } |
173 | if (st) { |
174 | vb->used= 0; |
175 | if (!(adns__vbuf_appendstr(vb,"<bad format... ") && |
176 | adns__vbuf_appendstr(vb,adns_strerror(st)) && |
177 | adns__vbuf_appendstr(vb,">") && |
178 | adns__vbuf_append(vb,"",1))) { |
179 | return "<cannot report bad format... out of memory>"; |
180 | } |
181 | } |
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182 | if (!vb->used) { |
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183 | adns__vbuf_appendstr(vb,"<truncated ...>"); |
184 | adns__vbuf_append(vb,"",1); |
185 | } |
186 | return vb->buf; |
187 | } |
1e9efa71 |
188 | |
189 | adns_status adns_rr_info(adns_rrtype type, |
190 | const char **rrtname_r, const char **fmtname_r, |
191 | int *len_r, |
192 | const void *datap, char **data_r) { |
193 | const typeinfo *typei; |
194 | vbuf vb; |
195 | adns_status st; |
196 | |
197 | typei= adns__findtype(type); |
9b86645c |
198 | if (!typei) return adns_s_unknownrrtype; |
1e9efa71 |
199 | |
200 | if (rrtname_r) *rrtname_r= typei->rrtname; |
201 | if (fmtname_r) *fmtname_r= typei->fmtname; |
202 | if (len_r) *len_r= typei->rrsz; |
203 | |
204 | if (!datap) return adns_s_ok; |
205 | |
206 | adns__vbuf_init(&vb); |
207 | st= typei->convstring(&vb,datap); |
208 | if (st) goto x_freevb; |
9b86645c |
209 | if (!adns__vbuf_append(&vb,"",1)) { st= adns_s_nomemory; goto x_freevb; } |
1e9efa71 |
210 | assert(strlen(vb.buf) == vb.used-1); |
211 | *data_r= realloc(vb.buf,vb.used); |
212 | if (!*data_r) *data_r= vb.buf; |
213 | return adns_s_ok; |
214 | |
215 | x_freevb: |
216 | adns__vbuf_free(&vb); |
217 | return st; |
218 | } |
219 | |
9e50e3ac |
220 | |
c2875680 |
221 | #define SINFO(n,s) { adns_s_##n, #n, s } |
1e9efa71 |
222 | |
223 | static const struct sinfo { |
224 | adns_status st; |
c2875680 |
225 | const char *abbrev; |
1e9efa71 |
226 | const char *string; |
227 | } sinfos[]= { |
9c344a42 |
228 | SINFO( ok, "OK" ), |
229 | |
230 | SINFO( nomemory, "Out of memory" ), |
231 | SINFO( unknownrrtype, "Query not implemented in DNS library" ), |
232 | SINFO( systemfail, "General resolver or system failure" ), |
233 | |
234 | SINFO( timeout, "DNS query timed out" ), |
235 | SINFO( allservfail, "All nameservers failed" ), |
236 | SINFO( norecurse, "Recursion denied by nameserver" ), |
237 | SINFO( invalidresponse, "Nameserver sent bad response" ), |
238 | SINFO( unknownformat, "Nameserver used unknown format" ), |
239 | |
240 | SINFO( rcodeservfail, "Nameserver reports failure" ), |
241 | SINFO( rcodeformaterror, "Query not understood by nameserver" ), |
242 | SINFO( rcodenotimplemented, "Query not implemented by nameserver" ), |
243 | SINFO( rcoderefused, "Query refused by nameserver" ), |
244 | SINFO( rcodeunknown, "Nameserver sent unknown response code" ), |
245 | |
246 | SINFO( inconsistent, "Inconsistent resource records in DNS" ), |
247 | SINFO( prohibitedcname, "DNS alias found where canonical name wanted" ), |
248 | SINFO( answerdomaininvalid, "Found syntactically invalid domain name" ), |
249 | SINFO( answerdomaintoolong, "Found overly-long domain name" ), |
250 | SINFO( invaliddata, "Found invalid DNS data" ), |
251 | |
252 | SINFO( querydomainwrong, "Domain invalid for particular DNS query type" ), |
253 | SINFO( querydomaininvalid, "Domain name is syntactically invalid" ), |
254 | SINFO( querydomaintoolong, "Domain name or component is too long" ), |
255 | |
256 | SINFO( nxdomain, "No such domain" ), |
257 | SINFO( nodata, "No such data" ) |
1e9efa71 |
258 | }; |
259 | |
260 | static int si_compar(const void *key, const void *elem) { |
261 | const adns_status *st= key; |
262 | const struct sinfo *si= elem; |
263 | |
264 | return *st < si->st ? -1 : *st > si->st ? 1 : 0; |
265 | } |
266 | |
c2875680 |
267 | static const struct sinfo *findsinfo(adns_status st) { |
9c344a42 |
268 | return bsearch(&st,sinfos, sizeof(sinfos)/sizeof(*sinfos), |
269 | sizeof(*sinfos), si_compar); |
c2875680 |
270 | } |
271 | |
98db6da3 |
272 | const char *adns_strerror(adns_status st) { |
c2875680 |
273 | const struct sinfo *si; |
1e9efa71 |
274 | |
c2875680 |
275 | si= findsinfo(st); |
276 | return si->string; |
277 | } |
278 | |
279 | const char *adns_errabbrev(adns_status st) { |
1e9efa71 |
280 | const struct sinfo *si; |
281 | |
c2875680 |
282 | si= findsinfo(st); |
283 | return si->abbrev; |
98db6da3 |
284 | } |
f318f883 |
285 | |
9e50e3ac |
286 | |
287 | #define STINFO(max) { adns_s_max_##max, #max } |
288 | |
289 | static const struct stinfo { |
290 | adns_status stmax; |
291 | const char *abbrev; |
292 | } stinfos[]= { |
293 | { adns_s_ok, "ok" }, |
294 | STINFO( localfail ), |
295 | STINFO( remotefail ), |
296 | STINFO( tempfail ), |
297 | STINFO( misconfig ), |
298 | STINFO( misquery ), |
299 | STINFO( permfail ) |
300 | }; |
301 | |
302 | static int sti_compar(const void *key, const void *elem) { |
303 | const adns_status *st= key; |
304 | const struct stinfo *sti= elem; |
305 | |
306 | adns_status here, min, max; |
307 | |
308 | here= *st; |
309 | min= (sti==stinfos) ? 0 : sti[-1].stmax+1; |
310 | max= sti->stmax; |
311 | |
312 | return here < min ? -1 : here > max ? 1 : 0; |
313 | } |
314 | |
315 | const char *adns_errtypeabbrev(adns_status st) { |
316 | const struct stinfo *sti; |
317 | |
9c344a42 |
318 | sti= bsearch(&st,stinfos, sizeof(stinfos)/sizeof(*stinfos), |
319 | sizeof(*stinfos), sti_compar); |
9e50e3ac |
320 | return sti->abbrev; |
321 | } |
322 | |
323 | |
f318f883 |
324 | void adns__isort(void *array, int nobjs, int sz, void *tempbuf, |
8c3aa944 |
325 | int (*needswap)(void *context, const void *a, const void *b), |
326 | void *context) { |
f318f883 |
327 | byte *data= array; |
328 | int i, place; |
329 | |
330 | for (i=0; i<nobjs; i++) { |
8c3aa944 |
331 | for (place= i; |
332 | place>0 && needswap(context, data + (place-1)*sz, data + i*sz); |
333 | place--); |
f318f883 |
334 | if (place != i) { |
335 | memcpy(tempbuf, data + i*sz, sz); |
336 | memmove(data + (place+1)*sz, data + place*sz, (i-place)*sz); |
337 | memcpy(data + place*sz, tempbuf, sz); |
338 | } |
339 | } |
340 | } |
87e46054 |
341 | |
342 | /* SIGPIPE protection. */ |
343 | |
344 | void adns__sigpipe_protect(adns_state ads) { |
345 | sigset_t toblock; |
346 | struct sigaction sa; |
347 | int r; |
348 | |
349 | if (ads->iflags & adns_if_nosigpipe) return; |
350 | |
351 | sigfillset(&toblock); |
352 | sigdelset(&toblock,SIGPIPE); |
353 | |
354 | sa.sa_handler= SIG_IGN; |
355 | sigfillset(&sa.sa_mask); |
356 | sa.sa_flags= 0; |
357 | |
358 | r= sigprocmask(SIG_SETMASK,&toblock,&ads->stdsigmask); assert(!r); |
359 | r= sigaction(SIGPIPE,&sa,&ads->stdsigpipe); assert(!r); |
360 | } |
361 | |
362 | void adns__sigpipe_unprotect(adns_state ads) { |
363 | int r; |
364 | |
365 | if (ads->iflags & adns_if_nosigpipe) return; |
366 | |
367 | r= sigaction(SIGPIPE,&ads->stdsigpipe,0); assert(!r); |
368 | r= sigprocmask(SIG_SETMASK,&ads->stdsigmask,0); assert(!r); |
369 | } |