3 * - diagnostic functions
7 * This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 #include <arpa/inet.h>
31 /* Core diagnostic functions */
33 void adns__vdiag(adns_state ads
, const char *pfx
, adns_initflags prevent
,
34 int serv
, adns_query qu
, const char *fmt
, va_list al
) {
35 const char *bef
, *aft
;
39 (!(ads
->iflags
& adns_if_debug
) && (!prevent
|| (ads
->iflags
& prevent
))))
42 fprintf(ads
->diagfile
,"adns%s: ",pfx
);
44 vfprintf(ads
->diagfile
,fmt
,al
);
49 if (qu
&& qu
->query_dgram
) {
51 fprintf(ads
->diagfile
,"%sQNAME=%s, QTYPE=%s",
53 adns__diag_domain(qu
->ads
,-1,0, &vb
,
54 qu
->query_dgram
,qu
->query_dglen
,DNS_HDRSIZE
),
55 qu
->typei ? qu
->typei
->rrtname
: "<unknown>");
56 if (qu
->typei
&& qu
->typei
->fmtname
)
57 fprintf(ads
->diagfile
,"(%s)",qu
->typei
->fmtname
);
62 fprintf(ads
->diagfile
,"%sNS=%s",bef
,inet_ntoa(ads
->servers
[serv
].addr
));
66 fputs(aft
,ads
->diagfile
);
69 void adns__debug(adns_state ads
, int serv
, adns_query qu
, const char *fmt
, ...) {
73 adns__vdiag(ads
," debug",0,serv
,qu
,fmt
,al
);
77 void adns__warn(adns_state ads
, int serv
, adns_query qu
, const char *fmt
, ...) {
81 adns__vdiag(ads
," warning",adns_if_noerrprint
|adns_if_noserverwarn
,serv
,qu
,fmt
,al
);
85 void adns__diag(adns_state ads
, int serv
, adns_query qu
, const char *fmt
, ...) {
89 adns__vdiag(ads
,"",adns_if_noerrprint
,serv
,qu
,fmt
,al
);
95 void adns__vbuf_init(vbuf
*vb
) {
96 vb
->used
= vb
->avail
= 0; vb
->buf
= 0;
99 int adns__vbuf_ensure(vbuf
*vb
, int want
) {
102 if (vb
->avail
>= want
) return 1;
103 nb
= realloc(vb
->buf
,want
); if (!nb
) return 0;
109 void adns__vbuf_appendq(vbuf
*vb
, const byte
*data
, int len
) {
110 memcpy(vb
->buf
+vb
->used
,data
,len
);
114 int adns__vbuf_append(vbuf
*vb
, const byte
*data
, int len
) {
118 newlen
= vb
->used
+len
;
119 if (vb
->avail
< newlen
) {
120 if (newlen
<20) newlen
= 20;
122 nb
= realloc(vb
->buf
,newlen
);
123 if (!nb
) { newlen
= vb
->used
+len
; nb
= realloc(vb
->buf
,newlen
); }
128 adns__vbuf_appendq(vb
,data
,len
);
132 int adns__vbuf_appendstr(vbuf
*vb
, const char *data
) {
135 return adns__vbuf_append(vb
,data
,l
);
138 void adns__vbuf_free(vbuf
*vb
) {
143 /* Additional diagnostic functions */
145 const char *adns__diag_domain(adns_state ads
, int serv
, adns_query qu
,
146 vbuf
*vb
, const byte
*dgram
, int dglen
, int cbyte
) {
149 st
= adns__parse_domain(ads
,serv
,qu
,vb
, pdf_quoteok
, dgram
,dglen
,&cbyte
,dglen
);
150 if (st
== adns_s_nomemory
) {
151 return "<cannot report domain... out of memory>";
155 if (!(adns__vbuf_appendstr(vb
,"<bad format... ") &&
156 adns__vbuf_appendstr(vb
,adns_strerror(st
)) &&
157 adns__vbuf_appendstr(vb
,">") &&
158 adns__vbuf_append(vb
,"",1))) {
159 return "<cannot report bad format... out of memory>";
163 adns__vbuf_appendstr(vb
,"<truncated ...>");
164 adns__vbuf_append(vb
,"",1);
169 adns_status
adns_rr_info(adns_rrtype type
,
170 const char **rrtname_r
, const char **fmtname_r
,
172 const void *datap
, char **data_r
) {
173 const typeinfo
*typei
;
177 typei
= adns__findtype(type
);
178 if (!typei
) return adns_s_unknownrrtype
;
180 if (rrtname_r
) *rrtname_r
= typei
->rrtname
;
181 if (fmtname_r
) *fmtname_r
= typei
->fmtname
;
182 if (len_r
) *len_r
= typei
->rrsz
;
184 if (!datap
) return adns_s_ok
;
186 adns__vbuf_init(&vb
);
187 st
= typei
->convstring(&vb
,datap
);
188 if (st
) goto x_freevb
;
189 if (!adns__vbuf_append(&vb
,"",1)) { st
= adns_s_nomemory
; goto x_freevb
; }
190 assert(strlen(vb
.buf
) == vb
.used
-1);
191 *data_r
= realloc(vb
.buf
,vb
.used
);
192 if (!*data_r
) *data_r
= vb
.buf
;
196 adns__vbuf_free(&vb
);
200 #define SINFO(n,s) { adns_s_##n, s }
202 static const struct sinfo
{
208 SINFO( nomemory
, "Out of memory" ),
209 SINFO( unknownrrtype
, "Query not implemented in DNS library" ),
211 SINFO( timeout
, "DNS query timed out" ),
212 SINFO( allservfail
, "All nameservers failed" ),
213 SINFO( norecurse
, "Recursion denied by nameserver" ),
214 SINFO( invalidresponse
, "Nameserver sent bad response" ),
215 SINFO( unknownformat
, "Nameserver used unknown format" ),
217 SINFO( rcodeservfail
, "Nameserver reports failure" ),
218 SINFO( rcodeformaterror
, "Query not understood by nameserver" ),
219 SINFO( rcodenotimplemented
, "Query not implemented by nameserver" ),
220 SINFO( rcoderefused
, "Query refused by nameserver" ),
221 SINFO( rcodeunknown
, "Nameserver sent unknown response code" ),
223 SINFO( inconsistent
, "Inconsistent resource records in DNS" ),
224 SINFO( prohibitedcname
, "DNS data refers to an alias" ),
225 SINFO( answerdomaininvalid
, "Found syntactically invalid domain name" ),
226 SINFO( answerdomaintoolong
, "Found overly-long domain name" ),
227 SINFO( invaliddata
, "Found invalid DNS data" ),
229 SINFO( querydomainwrong
, "Domain invalid for particular DNS query type" ),
230 SINFO( querydomaininvalid
, "Domain name is syntactically invalid" ),
231 SINFO( querydomaintoolong
, "Domain name is too long" ),
233 SINFO( nxdomain
, "No such domain" ),
234 SINFO( nodata
, "No such data" ),
237 static int si_compar(const void *key
, const void *elem
) {
238 const adns_status
*st
= key
;
239 const struct sinfo
*si
= elem
;
241 return *st
< si
->st ?
-1 : *st
> si
->st ?
1 : 0;
244 const char *adns_strerror(adns_status st
) {
245 static char buf
[100];
247 const struct sinfo
*si
;
249 si
= bsearch(&st
,sinfos
,sizeof(sinfos
)/sizeof(*si
),sizeof(*si
),si_compar
);
250 if (si
) return si
->string
;
252 snprintf(buf
,sizeof(buf
),"code %d",st
);
256 void adns__isort(void *array
, int nobjs
, int sz
, void *tempbuf
,
257 int (*needswap
)(void *context
, const void *a
, const void *b
),
262 for (i
=0; i
<nobjs
; i
++) {
264 place
>0 && needswap(context
, data
+ (place
-1)*sz
, data
+ i
*sz
);
267 memcpy(tempbuf
, data
+ i
*sz
, sz
);
268 memmove(data
+ (place
+1)*sz
, data
+ place
*sz
, (i
-place
)*sz
);
269 memcpy(data
+ place
*sz
, tempbuf
, sz
);
274 /* SIGPIPE protection. */
276 void adns__sigpipe_protect(adns_state ads
) {
281 if (ads
->iflags
& adns_if_nosigpipe
) return;
283 sigfillset(&toblock
);
284 sigdelset(&toblock
,SIGPIPE
);
286 sa
.sa_handler
= SIG_IGN
;
287 sigfillset(&sa
.sa_mask
);
290 r
= sigprocmask(SIG_SETMASK
,&toblock
,&ads
->stdsigmask
); assert(!r
);
291 r
= sigaction(SIGPIPE
,&sa
,&ads
->stdsigpipe
); assert(!r
);
294 void adns__sigpipe_unprotect(adns_state ads
) {
297 if (ads
->iflags
& adns_if_nosigpipe
) return;
299 r
= sigaction(SIGPIPE
,&ads
->stdsigpipe
,0); assert(!r
);
300 r
= sigprocmask(SIG_SETMASK
,&ads
->stdsigmask
,0); assert(!r
);