3 * - diagnostic functions
8 * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
10 * It is part of adns, which is
11 * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
12 * Copyright (C) 1999 Tony Finch <dot@dotat.at>
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)
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.
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.
32 #include <sys/types.h>
33 #include <sys/socket.h>
34 #include <netinet/in.h>
35 #include <arpa/inet.h>
39 /* Core diagnostic functions */
41 void adns__vdiag(adns_state ads
, const char *pfx
, adns_initflags prevent
,
42 int serv
, adns_query qu
, const char *fmt
, va_list al
) {
43 const char *bef
, *aft
;
47 (!(ads
->iflags
& adns_if_debug
) && (!prevent
|| (ads
->iflags
& prevent
))))
50 if (ads
->iflags
& adns_if_logpid
) {
51 fprintf(ads
->diagfile
,"adns%s [%ld]: ",pfx
,(long)getpid());
53 fprintf(ads
->diagfile
,"adns%s: ",pfx
);
56 vfprintf(ads
->diagfile
,fmt
,al
);
61 if (qu
&& qu
->query_dgram
) {
63 fprintf(ads
->diagfile
,"%sQNAME=%s, QTYPE=%s",
65 adns__diag_domain(qu
->ads
,-1,0, &vb
,
66 qu
->query_dgram
,qu
->query_dglen
,DNS_HDRSIZE
),
67 qu
->typei ? qu
->typei
->rrtname
: "<unknown>");
68 if (qu
->typei
&& qu
->typei
->fmtname
)
69 fprintf(ads
->diagfile
,"(%s)",qu
->typei
->fmtname
);
75 fprintf(ads
->diagfile
,"%sNS=%s",bef
,inet_ntoa(ads
->servers
[serv
].addr
));
79 fputs(aft
,ads
->diagfile
);
82 void adns__debug(adns_state ads
, int serv
, adns_query qu
, const char *fmt
, ...) {
86 adns__vdiag(ads
," debug",0,serv
,qu
,fmt
,al
);
90 void adns__warn(adns_state ads
, int serv
, adns_query qu
, const char *fmt
, ...) {
94 adns__vdiag(ads
," warning",adns_if_noerrprint
|adns_if_noserverwarn
,serv
,qu
,fmt
,al
);
98 void adns__diag(adns_state ads
, int serv
, adns_query qu
, const char *fmt
, ...) {
102 adns__vdiag(ads
,"",adns_if_noerrprint
,serv
,qu
,fmt
,al
);
108 void adns__vbuf_init(vbuf
*vb
) {
109 vb
->used
= vb
->avail
= 0; vb
->buf
= 0;
112 int adns__vbuf_ensure(vbuf
*vb
, int want
) {
115 if (vb
->avail
>= want
) return 1;
116 nb
= realloc(vb
->buf
,want
); if (!nb
) return 0;
122 void adns__vbuf_appendq(vbuf
*vb
, const byte
*data
, int len
) {
123 memcpy(vb
->buf
+vb
->used
,data
,len
);
127 int adns__vbuf_append(vbuf
*vb
, const byte
*data
, int len
) {
131 newlen
= vb
->used
+len
;
132 if (vb
->avail
< newlen
) {
133 if (newlen
<20) newlen
= 20;
135 nb
= realloc(vb
->buf
,newlen
);
136 if (!nb
) { newlen
= vb
->used
+len
; nb
= realloc(vb
->buf
,newlen
); }
141 adns__vbuf_appendq(vb
,data
,len
);
145 int adns__vbuf_appendstr(vbuf
*vb
, const char *data
) {
148 return adns__vbuf_append(vb
,data
,l
);
151 void adns__vbuf_free(vbuf
*vb
) {
156 /* Additional diagnostic functions */
158 const char *adns__diag_domain(adns_state ads
, int serv
, adns_query qu
,
159 vbuf
*vb
, const byte
*dgram
, int dglen
, int cbyte
) {
162 st
= adns__parse_domain(ads
,serv
,qu
,vb
, pdf_quoteok
, dgram
,dglen
,&cbyte
,dglen
);
163 if (st
== adns_s_nomemory
) {
164 return "<cannot report domain... out of memory>";
168 if (!(adns__vbuf_appendstr(vb
,"<bad format... ") &&
169 adns__vbuf_appendstr(vb
,adns_strerror(st
)) &&
170 adns__vbuf_appendstr(vb
,">") &&
171 adns__vbuf_append(vb
,"",1))) {
172 return "<cannot report bad format... out of memory>";
176 adns__vbuf_appendstr(vb
,"<truncated ...>");
177 adns__vbuf_append(vb
,"",1);
182 adns_status
adns_rr_info(adns_rrtype type
,
183 const char **rrtname_r
, const char **fmtname_r
,
185 const void *datap
, char **data_r
) {
186 const typeinfo
*typei
;
190 typei
= adns__findtype(type
);
191 if (!typei
) return adns_s_unknownrrtype
;
193 if (rrtname_r
) *rrtname_r
= typei
->rrtname
;
194 if (fmtname_r
) *fmtname_r
= typei
->fmtname
;
195 if (len_r
) *len_r
= typei
->rrsz
;
197 if (!datap
) return adns_s_ok
;
199 adns__vbuf_init(&vb
);
200 st
= typei
->convstring(&vb
,datap
);
201 if (st
) goto x_freevb
;
202 if (!adns__vbuf_append(&vb
,"",1)) { st
= adns_s_nomemory
; goto x_freevb
; }
203 assert(strlen(vb
.buf
) == vb
.used
-1);
204 *data_r
= realloc(vb
.buf
,vb
.used
);
205 if (!*data_r
) *data_r
= vb
.buf
;
209 adns__vbuf_free(&vb
);
214 #define SINFO(n,s) { adns_s_##n, #n, s }
216 static const struct sinfo
{
223 SINFO( nomemory
, "Out of memory" ),
224 SINFO( unknownrrtype
, "Query not implemented in DNS library" ),
225 SINFO( systemfail
, "General resolver or system failure" ),
227 SINFO( timeout
, "DNS query timed out" ),
228 SINFO( allservfail
, "All nameservers failed" ),
229 SINFO( norecurse
, "Recursion denied by nameserver" ),
230 SINFO( invalidresponse
, "Nameserver sent bad response" ),
231 SINFO( unknownformat
, "Nameserver used unknown format" ),
233 SINFO( rcodeservfail
, "Nameserver reports failure" ),
234 SINFO( rcodeformaterror
, "Query not understood by nameserver" ),
235 SINFO( rcodenotimplemented
, "Query not implemented by nameserver" ),
236 SINFO( rcoderefused
, "Query refused by nameserver" ),
237 SINFO( rcodeunknown
, "Nameserver sent unknown response code" ),
239 SINFO( inconsistent
, "Inconsistent resource records in DNS" ),
240 SINFO( prohibitedcname
, "DNS alias found where canonical name wanted" ),
241 SINFO( answerdomaininvalid
, "Found syntactically invalid domain name" ),
242 SINFO( answerdomaintoolong
, "Found overly-long domain name" ),
243 SINFO( invaliddata
, "Found invalid DNS data" ),
245 SINFO( querydomainwrong
, "Domain invalid for particular DNS query type" ),
246 SINFO( querydomaininvalid
, "Domain name is syntactically invalid" ),
247 SINFO( querydomaintoolong
, "Domain name or component is too long" ),
249 SINFO( nxdomain
, "No such domain" ),
250 SINFO( nodata
, "No such data" )
253 static int si_compar(const void *key
, const void *elem
) {
254 const adns_status
*st
= key
;
255 const struct sinfo
*si
= elem
;
257 return *st
< si
->st ?
-1 : *st
> si
->st ?
1 : 0;
260 static const struct sinfo
*findsinfo(adns_status st
) {
261 return bsearch(&st
,sinfos
,sizeof(sinfos
)/sizeof(*sinfos
),sizeof(*sinfos
),si_compar
);
264 const char *adns_strerror(adns_status st
) {
265 const struct sinfo
*si
;
271 const char *adns_errabbrev(adns_status st
) {
272 const struct sinfo
*si
;
279 #define STINFO(max) { adns_s_max_##max, #max }
281 static const struct stinfo
{
287 STINFO( remotefail
),
294 static int sti_compar(const void *key
, const void *elem
) {
295 const adns_status
*st
= key
;
296 const struct stinfo
*sti
= elem
;
298 adns_status here
, min
, max
;
301 min
= (sti
==stinfos
) ?
0 : sti
[-1].stmax
+1;
304 return here
< min ?
-1 : here
> max ?
1 : 0;
307 const char *adns_errtypeabbrev(adns_status st
) {
308 const struct stinfo
*sti
;
310 sti
= bsearch(&st
,stinfos
,sizeof(stinfos
)/sizeof(*stinfos
),sizeof(*stinfos
),sti_compar
);
315 void adns__isort(void *array
, int nobjs
, int sz
, void *tempbuf
,
316 int (*needswap
)(void *context
, const void *a
, const void *b
),
321 for (i
=0; i
<nobjs
; i
++) {
323 place
>0 && needswap(context
, data
+ (place
-1)*sz
, data
+ i
*sz
);
326 memcpy(tempbuf
, data
+ i
*sz
, sz
);
327 memmove(data
+ (place
+1)*sz
, data
+ place
*sz
, (i
-place
)*sz
);
328 memcpy(data
+ place
*sz
, tempbuf
, sz
);
333 /* SIGPIPE protection. */
335 void adns__sigpipe_protect(adns_state ads
) {
340 if (ads
->iflags
& adns_if_nosigpipe
) return;
342 sigfillset(&toblock
);
343 sigdelset(&toblock
,SIGPIPE
);
345 sa
.sa_handler
= SIG_IGN
;
346 sigfillset(&sa
.sa_mask
);
349 r
= sigprocmask(SIG_SETMASK
,&toblock
,&ads
->stdsigmask
); assert(!r
);
350 r
= sigaction(SIGPIPE
,&sa
,&ads
->stdsigpipe
); assert(!r
);
353 void adns__sigpipe_unprotect(adns_state ads
) {
356 if (ads
->iflags
& adns_if_nosigpipe
) return;
358 r
= sigaction(SIGPIPE
,&ads
->stdsigpipe
,0); assert(!r
);
359 r
= sigprocmask(SIG_SETMASK
,&ads
->stdsigmask
,0); assert(!r
);