98db6da3 |
1 | /* |
2 | * general.c |
3 | * - diagnostic functions |
4 | * - vbuf handling |
5 | */ |
6 | /* |
a79ac5ba |
7 | * This file is |
8 | * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk> |
9 | * |
10 | * It is part of adns, which is |
11 | * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk> |
12 | * Copyright (C) 1999 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 || |
47 | (!(ads->iflags & adns_if_debug) && (!prevent || (ads->iflags & prevent)))) |
48 | return; |
98db6da3 |
49 | |
a122e99d |
50 | if (ads->iflags & adns_if_logpid) { |
51 | fprintf(ads->diagfile,"adns%s [%ld]: ",pfx,(long)getpid()); |
52 | } else { |
53 | fprintf(ads->diagfile,"adns%s: ",pfx); |
54 | } |
98db6da3 |
55 | |
d6b271ae |
56 | vfprintf(ads->diagfile,fmt,al); |
98db6da3 |
57 | |
58 | bef= " ("; |
59 | aft= "\n"; |
60 | |
61 | if (qu && qu->query_dgram) { |
62 | adns__vbuf_init(&vb); |
d6b271ae |
63 | fprintf(ads->diagfile,"%sQNAME=%s, QTYPE=%s", |
98db6da3 |
64 | bef, |
cd363ffd |
65 | adns__diag_domain(qu->ads,-1,0, &vb, |
11c8bf9b |
66 | qu->query_dgram,qu->query_dglen,DNS_HDRSIZE), |
1e9efa71 |
67 | qu->typei ? qu->typei->rrtname : "<unknown>"); |
68 | if (qu->typei && qu->typei->fmtname) |
d6b271ae |
69 | fprintf(ads->diagfile,"(%s)",qu->typei->fmtname); |
98db6da3 |
70 | bef=", "; aft=")\n"; |
71 | } |
72 | |
73 | if (serv>=0) { |
d6b271ae |
74 | fprintf(ads->diagfile,"%sNS=%s",bef,inet_ntoa(ads->servers[serv].addr)); |
98db6da3 |
75 | bef=", "; aft=")\n"; |
76 | } |
77 | |
d6b271ae |
78 | fputs(aft,ads->diagfile); |
98db6da3 |
79 | } |
80 | |
81 | void adns__debug(adns_state ads, int serv, adns_query qu, const char *fmt, ...) { |
82 | va_list al; |
83 | |
84 | va_start(al,fmt); |
85 | adns__vdiag(ads," debug",0,serv,qu,fmt,al); |
86 | va_end(al); |
87 | } |
88 | |
89 | void adns__warn(adns_state ads, int serv, adns_query qu, const char *fmt, ...) { |
90 | va_list al; |
91 | |
92 | va_start(al,fmt); |
93 | adns__vdiag(ads," warning",adns_if_noerrprint|adns_if_noserverwarn,serv,qu,fmt,al); |
94 | va_end(al); |
95 | } |
96 | |
97 | void adns__diag(adns_state ads, int serv, adns_query qu, const char *fmt, ...) { |
98 | va_list al; |
99 | |
100 | va_start(al,fmt); |
101 | adns__vdiag(ads,"",adns_if_noerrprint,serv,qu,fmt,al); |
102 | va_end(al); |
103 | } |
104 | |
105 | /* vbuf functions */ |
106 | |
107 | void adns__vbuf_init(vbuf *vb) { |
108 | vb->used= vb->avail= 0; vb->buf= 0; |
109 | } |
110 | |
111 | int adns__vbuf_ensure(vbuf *vb, int want) { |
112 | void *nb; |
113 | |
114 | if (vb->avail >= want) return 1; |
115 | nb= realloc(vb->buf,want); if (!nb) return 0; |
116 | vb->buf= nb; |
117 | vb->avail= want; |
118 | return 1; |
119 | } |
120 | |
121 | void adns__vbuf_appendq(vbuf *vb, const byte *data, int len) { |
122 | memcpy(vb->buf+vb->used,data,len); |
123 | vb->used+= len; |
124 | } |
125 | |
126 | int adns__vbuf_append(vbuf *vb, const byte *data, int len) { |
127 | int newlen; |
128 | void *nb; |
129 | |
130 | newlen= vb->used+len; |
131 | if (vb->avail < newlen) { |
f47cdeec |
132 | if (newlen<20) newlen= 20; |
98db6da3 |
133 | newlen <<= 1; |
134 | nb= realloc(vb->buf,newlen); |
f47cdeec |
135 | if (!nb) { newlen= vb->used+len; nb= realloc(vb->buf,newlen); } |
98db6da3 |
136 | if (!nb) return 0; |
137 | vb->buf= nb; |
138 | vb->avail= newlen; |
139 | } |
140 | adns__vbuf_appendq(vb,data,len); |
141 | return 1; |
142 | } |
143 | |
c9afe7bb |
144 | int adns__vbuf_appendstr(vbuf *vb, const char *data) { |
145 | int l; |
9a2b67d4 |
146 | l= strlen(data); |
c9afe7bb |
147 | return adns__vbuf_append(vb,data,l); |
148 | } |
149 | |
f47cdeec |
150 | void adns__vbuf_free(vbuf *vb) { |
151 | free(vb->buf); |
152 | adns__vbuf_init(vb); |
153 | } |
154 | |
98db6da3 |
155 | /* Additional diagnostic functions */ |
156 | |
cd363ffd |
157 | const char *adns__diag_domain(adns_state ads, int serv, adns_query qu, |
158 | vbuf *vb, const byte *dgram, int dglen, int cbyte) { |
98db6da3 |
159 | adns_status st; |
160 | |
cd363ffd |
161 | st= adns__parse_domain(ads,serv,qu,vb, pdf_quoteok, dgram,dglen,&cbyte,dglen); |
9b86645c |
162 | if (st == adns_s_nomemory) { |
98db6da3 |
163 | return "<cannot report domain... out of memory>"; |
164 | } |
165 | if (st) { |
166 | vb->used= 0; |
167 | if (!(adns__vbuf_appendstr(vb,"<bad format... ") && |
168 | adns__vbuf_appendstr(vb,adns_strerror(st)) && |
169 | adns__vbuf_appendstr(vb,">") && |
170 | adns__vbuf_append(vb,"",1))) { |
171 | return "<cannot report bad format... out of memory>"; |
172 | } |
173 | } |
11c8bf9b |
174 | if (!vb->used) { |
98db6da3 |
175 | adns__vbuf_appendstr(vb,"<truncated ...>"); |
176 | adns__vbuf_append(vb,"",1); |
177 | } |
178 | return vb->buf; |
179 | } |
1e9efa71 |
180 | |
181 | adns_status adns_rr_info(adns_rrtype type, |
182 | const char **rrtname_r, const char **fmtname_r, |
183 | int *len_r, |
184 | const void *datap, char **data_r) { |
185 | const typeinfo *typei; |
186 | vbuf vb; |
187 | adns_status st; |
188 | |
189 | typei= adns__findtype(type); |
9b86645c |
190 | if (!typei) return adns_s_unknownrrtype; |
1e9efa71 |
191 | |
192 | if (rrtname_r) *rrtname_r= typei->rrtname; |
193 | if (fmtname_r) *fmtname_r= typei->fmtname; |
194 | if (len_r) *len_r= typei->rrsz; |
195 | |
196 | if (!datap) return adns_s_ok; |
197 | |
198 | adns__vbuf_init(&vb); |
199 | st= typei->convstring(&vb,datap); |
200 | if (st) goto x_freevb; |
9b86645c |
201 | if (!adns__vbuf_append(&vb,"",1)) { st= adns_s_nomemory; goto x_freevb; } |
1e9efa71 |
202 | assert(strlen(vb.buf) == vb.used-1); |
203 | *data_r= realloc(vb.buf,vb.used); |
204 | if (!*data_r) *data_r= vb.buf; |
205 | return adns_s_ok; |
206 | |
207 | x_freevb: |
208 | adns__vbuf_free(&vb); |
209 | return st; |
210 | } |
211 | |
9e50e3ac |
212 | |
c2875680 |
213 | #define SINFO(n,s) { adns_s_##n, #n, s } |
1e9efa71 |
214 | |
215 | static const struct sinfo { |
216 | adns_status st; |
c2875680 |
217 | const char *abbrev; |
1e9efa71 |
218 | const char *string; |
219 | } sinfos[]= { |
9b86645c |
220 | SINFO( ok, "OK" ), |
221 | |
222 | SINFO( nomemory, "Out of memory" ), |
223 | SINFO( unknownrrtype, "Query not implemented in DNS library" ), |
e7e89cca |
224 | SINFO( systemfail, "General resolver or system failure" ), |
9b86645c |
225 | |
226 | SINFO( timeout, "DNS query timed out" ), |
227 | SINFO( allservfail, "All nameservers failed" ), |
228 | SINFO( norecurse, "Recursion denied by nameserver" ), |
229 | SINFO( invalidresponse, "Nameserver sent bad response" ), |
230 | SINFO( unknownformat, "Nameserver used unknown format" ), |
231 | |
232 | SINFO( rcodeservfail, "Nameserver reports failure" ), |
233 | SINFO( rcodeformaterror, "Query not understood by nameserver" ), |
234 | SINFO( rcodenotimplemented, "Query not implemented by nameserver" ), |
235 | SINFO( rcoderefused, "Query refused by nameserver" ), |
236 | SINFO( rcodeunknown, "Nameserver sent unknown response code" ), |
237 | |
238 | SINFO( inconsistent, "Inconsistent resource records in DNS" ), |
c1716cb3 |
239 | SINFO( prohibitedcname, "DNS alias found where canonical name wanted" ), |
9b86645c |
240 | SINFO( answerdomaininvalid, "Found syntactically invalid domain name" ), |
241 | SINFO( answerdomaintoolong, "Found overly-long domain name" ), |
242 | SINFO( invaliddata, "Found invalid DNS data" ), |
243 | |
244 | SINFO( querydomainwrong, "Domain invalid for particular DNS query type" ), |
245 | SINFO( querydomaininvalid, "Domain name is syntactically invalid" ), |
246 | SINFO( querydomaintoolong, "Domain name is too long" ), |
247 | |
248 | SINFO( nxdomain, "No such domain" ), |
9e50e3ac |
249 | SINFO( nodata, "No such data" ) |
1e9efa71 |
250 | }; |
251 | |
252 | static int si_compar(const void *key, const void *elem) { |
253 | const adns_status *st= key; |
254 | const struct sinfo *si= elem; |
255 | |
256 | return *st < si->st ? -1 : *st > si->st ? 1 : 0; |
257 | } |
258 | |
c2875680 |
259 | static const struct sinfo *findsinfo(adns_status st) { |
260 | return bsearch(&st,sinfos,sizeof(sinfos)/sizeof(*sinfos),sizeof(*sinfos),si_compar); |
261 | } |
262 | |
98db6da3 |
263 | const char *adns_strerror(adns_status st) { |
c2875680 |
264 | const struct sinfo *si; |
1e9efa71 |
265 | |
c2875680 |
266 | si= findsinfo(st); |
267 | return si->string; |
268 | } |
269 | |
270 | const char *adns_errabbrev(adns_status st) { |
1e9efa71 |
271 | const struct sinfo *si; |
272 | |
c2875680 |
273 | si= findsinfo(st); |
274 | return si->abbrev; |
98db6da3 |
275 | } |
f318f883 |
276 | |
9e50e3ac |
277 | |
278 | #define STINFO(max) { adns_s_max_##max, #max } |
279 | |
280 | static const struct stinfo { |
281 | adns_status stmax; |
282 | const char *abbrev; |
283 | } stinfos[]= { |
284 | { adns_s_ok, "ok" }, |
285 | STINFO( localfail ), |
286 | STINFO( remotefail ), |
287 | STINFO( tempfail ), |
288 | STINFO( misconfig ), |
289 | STINFO( misquery ), |
290 | STINFO( permfail ) |
291 | }; |
292 | |
293 | static int sti_compar(const void *key, const void *elem) { |
294 | const adns_status *st= key; |
295 | const struct stinfo *sti= elem; |
296 | |
297 | adns_status here, min, max; |
298 | |
299 | here= *st; |
300 | min= (sti==stinfos) ? 0 : sti[-1].stmax+1; |
301 | max= sti->stmax; |
302 | |
303 | return here < min ? -1 : here > max ? 1 : 0; |
304 | } |
305 | |
306 | const char *adns_errtypeabbrev(adns_status st) { |
307 | const struct stinfo *sti; |
308 | |
309 | sti= bsearch(&st,stinfos,sizeof(stinfos)/sizeof(*stinfos),sizeof(*stinfos),sti_compar); |
310 | return sti->abbrev; |
311 | } |
312 | |
313 | |
f318f883 |
314 | void adns__isort(void *array, int nobjs, int sz, void *tempbuf, |
8c3aa944 |
315 | int (*needswap)(void *context, const void *a, const void *b), |
316 | void *context) { |
f318f883 |
317 | byte *data= array; |
318 | int i, place; |
319 | |
320 | for (i=0; i<nobjs; i++) { |
8c3aa944 |
321 | for (place= i; |
322 | place>0 && needswap(context, data + (place-1)*sz, data + i*sz); |
323 | place--); |
f318f883 |
324 | if (place != i) { |
325 | memcpy(tempbuf, data + i*sz, sz); |
326 | memmove(data + (place+1)*sz, data + place*sz, (i-place)*sz); |
327 | memcpy(data + place*sz, tempbuf, sz); |
328 | } |
329 | } |
330 | } |
87e46054 |
331 | |
332 | /* SIGPIPE protection. */ |
333 | |
334 | void adns__sigpipe_protect(adns_state ads) { |
335 | sigset_t toblock; |
336 | struct sigaction sa; |
337 | int r; |
338 | |
339 | if (ads->iflags & adns_if_nosigpipe) return; |
340 | |
341 | sigfillset(&toblock); |
342 | sigdelset(&toblock,SIGPIPE); |
343 | |
344 | sa.sa_handler= SIG_IGN; |
345 | sigfillset(&sa.sa_mask); |
346 | sa.sa_flags= 0; |
347 | |
348 | r= sigprocmask(SIG_SETMASK,&toblock,&ads->stdsigmask); assert(!r); |
349 | r= sigaction(SIGPIPE,&sa,&ads->stdsigpipe); assert(!r); |
350 | } |
351 | |
352 | void adns__sigpipe_unprotect(adns_state ads) { |
353 | int r; |
354 | |
355 | if (ads->iflags & adns_if_nosigpipe) return; |
356 | |
357 | r= sigaction(SIGPIPE,&ads->stdsigpipe,0); assert(!r); |
358 | r= sigprocmask(SIG_SETMASK,&ads->stdsigmask,0); assert(!r); |
359 | } |