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.
26 #include <sys/types.h>
27 #include <sys/socket.h>
28 #include <netinet/in.h>
29 #include <arpa/inet.h>
33 /* Core diagnostic functions */
35 void adns__vdiag(adns_state ads
, const char *pfx
, adns_initflags prevent
,
36 int serv
, adns_query qu
, const char *fmt
, va_list al
) {
37 const char *bef
, *aft
;
41 (!(ads
->iflags
& adns_if_debug
) && (!prevent
|| (ads
->iflags
& prevent
))))
44 fprintf(ads
->diagfile
,"adns%s: ",pfx
);
46 vfprintf(ads
->diagfile
,fmt
,al
);
51 if (qu
&& qu
->query_dgram
) {
53 fprintf(ads
->diagfile
,"%sQNAME=%s, QTYPE=%s",
55 adns__diag_domain(qu
->ads
,-1,0, &vb
,
56 qu
->query_dgram
,qu
->query_dglen
,DNS_HDRSIZE
),
57 qu
->typei ? qu
->typei
->rrtname
: "<unknown>");
58 if (qu
->typei
&& qu
->typei
->fmtname
)
59 fprintf(ads
->diagfile
,"(%s)",qu
->typei
->fmtname
);
64 fprintf(ads
->diagfile
,"%sNS=%s",bef
,inet_ntoa(ads
->servers
[serv
].addr
));
68 fputs(aft
,ads
->diagfile
);
71 void adns__debug(adns_state ads
, int serv
, adns_query qu
, const char *fmt
, ...) {
75 adns__vdiag(ads
," debug",0,serv
,qu
,fmt
,al
);
79 void adns__warn(adns_state ads
, int serv
, adns_query qu
, const char *fmt
, ...) {
83 adns__vdiag(ads
," warning",adns_if_noerrprint
|adns_if_noserverwarn
,serv
,qu
,fmt
,al
);
87 void adns__diag(adns_state ads
, int serv
, adns_query qu
, const char *fmt
, ...) {
91 adns__vdiag(ads
,"",adns_if_noerrprint
,serv
,qu
,fmt
,al
);
97 void adns__vbuf_init(vbuf
*vb
) {
98 vb
->used
= vb
->avail
= 0; vb
->buf
= 0;
101 int adns__vbuf_ensure(vbuf
*vb
, int want
) {
104 if (vb
->avail
>= want
) return 1;
105 nb
= realloc(vb
->buf
,want
); if (!nb
) return 0;
111 void adns__vbuf_appendq(vbuf
*vb
, const byte
*data
, int len
) {
112 memcpy(vb
->buf
+vb
->used
,data
,len
);
116 int adns__vbuf_append(vbuf
*vb
, const byte
*data
, int len
) {
120 newlen
= vb
->used
+len
;
121 if (vb
->avail
< newlen
) {
122 if (newlen
<20) newlen
= 20;
124 nb
= realloc(vb
->buf
,newlen
);
125 if (!nb
) { newlen
= vb
->used
+len
; nb
= realloc(vb
->buf
,newlen
); }
130 adns__vbuf_appendq(vb
,data
,len
);
134 int adns__vbuf_appendstr(vbuf
*vb
, const char *data
) {
137 return adns__vbuf_append(vb
,data
,l
);
140 void adns__vbuf_free(vbuf
*vb
) {
145 /* Additional diagnostic functions */
147 const char *adns__diag_domain(adns_state ads
, int serv
, adns_query qu
,
148 vbuf
*vb
, const byte
*dgram
, int dglen
, int cbyte
) {
151 st
= adns__parse_domain(ads
,serv
,qu
,vb
, pdf_quoteok
, dgram
,dglen
,&cbyte
,dglen
);
152 if (st
== adns_s_nomemory
) {
153 return "<cannot report domain... out of memory>";
157 if (!(adns__vbuf_appendstr(vb
,"<bad format... ") &&
158 adns__vbuf_appendstr(vb
,adns_strerror(st
)) &&
159 adns__vbuf_appendstr(vb
,">") &&
160 adns__vbuf_append(vb
,"",1))) {
161 return "<cannot report bad format... out of memory>";
165 adns__vbuf_appendstr(vb
,"<truncated ...>");
166 adns__vbuf_append(vb
,"",1);
171 adns_status
adns_rr_info(adns_rrtype type
,
172 const char **rrtname_r
, const char **fmtname_r
,
174 const void *datap
, char **data_r
) {
175 const typeinfo
*typei
;
179 typei
= adns__findtype(type
);
180 if (!typei
) return adns_s_unknownrrtype
;
182 if (rrtname_r
) *rrtname_r
= typei
->rrtname
;
183 if (fmtname_r
) *fmtname_r
= typei
->fmtname
;
184 if (len_r
) *len_r
= typei
->rrsz
;
186 if (!datap
) return adns_s_ok
;
188 adns__vbuf_init(&vb
);
189 st
= typei
->convstring(&vb
,datap
);
190 if (st
) goto x_freevb
;
191 if (!adns__vbuf_append(&vb
,"",1)) { st
= adns_s_nomemory
; goto x_freevb
; }
192 assert(strlen(vb
.buf
) == vb
.used
-1);
193 *data_r
= realloc(vb
.buf
,vb
.used
);
194 if (!*data_r
) *data_r
= vb
.buf
;
198 adns__vbuf_free(&vb
);
202 #define SINFO(n,s) { adns_s_##n, #n, s }
204 static const struct sinfo
{
211 SINFO( nomemory
, "Out of memory" ),
212 SINFO( unknownrrtype
, "Query not implemented in DNS library" ),
213 SINFO( systemfail
, "General resolver or system failure" ),
215 SINFO( timeout
, "DNS query timed out" ),
216 SINFO( allservfail
, "All nameservers failed" ),
217 SINFO( norecurse
, "Recursion denied by nameserver" ),
218 SINFO( invalidresponse
, "Nameserver sent bad response" ),
219 SINFO( unknownformat
, "Nameserver used unknown format" ),
221 SINFO( rcodeservfail
, "Nameserver reports failure" ),
222 SINFO( rcodeformaterror
, "Query not understood by nameserver" ),
223 SINFO( rcodenotimplemented
, "Query not implemented by nameserver" ),
224 SINFO( rcoderefused
, "Query refused by nameserver" ),
225 SINFO( rcodeunknown
, "Nameserver sent unknown response code" ),
227 SINFO( inconsistent
, "Inconsistent resource records in DNS" ),
228 SINFO( prohibitedcname
, "DNS data refers to an alias" ),
229 SINFO( answerdomaininvalid
, "Found syntactically invalid domain name" ),
230 SINFO( answerdomaintoolong
, "Found overly-long domain name" ),
231 SINFO( invaliddata
, "Found invalid DNS data" ),
233 SINFO( querydomainwrong
, "Domain invalid for particular DNS query type" ),
234 SINFO( querydomaininvalid
, "Domain name is syntactically invalid" ),
235 SINFO( querydomaintoolong
, "Domain name is too long" ),
237 SINFO( nxdomain
, "No such domain" ),
238 SINFO( nodata
, "No such data" ),
241 static int si_compar(const void *key
, const void *elem
) {
242 const adns_status
*st
= key
;
243 const struct sinfo
*si
= elem
;
245 return *st
< si
->st ?
-1 : *st
> si
->st ?
1 : 0;
248 static const struct sinfo
*findsinfo(adns_status st
) {
249 return bsearch(&st
,sinfos
,sizeof(sinfos
)/sizeof(*sinfos
),sizeof(*sinfos
),si_compar
);
252 const char *adns_strerror(adns_status st
) {
253 const struct sinfo
*si
;
259 const char *adns_errabbrev(adns_status st
) {
260 const struct sinfo
*si
;
266 void adns__isort(void *array
, int nobjs
, int sz
, void *tempbuf
,
267 int (*needswap
)(void *context
, const void *a
, const void *b
),
272 for (i
=0; i
<nobjs
; i
++) {
274 place
>0 && needswap(context
, data
+ (place
-1)*sz
, data
+ i
*sz
);
277 memcpy(tempbuf
, data
+ i
*sz
, sz
);
278 memmove(data
+ (place
+1)*sz
, data
+ place
*sz
, (i
-place
)*sz
);
279 memcpy(data
+ place
*sz
, tempbuf
, sz
);
284 /* SIGPIPE protection. */
286 void adns__sigpipe_protect(adns_state ads
) {
291 if (ads
->iflags
& adns_if_nosigpipe
) return;
293 sigfillset(&toblock
);
294 sigdelset(&toblock
,SIGPIPE
);
296 sa
.sa_handler
= SIG_IGN
;
297 sigfillset(&sa
.sa_mask
);
300 r
= sigprocmask(SIG_SETMASK
,&toblock
,&ads
->stdsigmask
); assert(!r
);
301 r
= sigaction(SIGPIPE
,&sa
,&ads
->stdsigpipe
); assert(!r
);
304 void adns__sigpipe_unprotect(adns_state ads
) {
307 if (ads
->iflags
& adns_if_nosigpipe
) return;
309 r
= sigaction(SIGPIPE
,&ads
->stdsigpipe
,0); assert(!r
);
310 r
= sigprocmask(SIG_SETMASK
,&ads
->stdsigmask
,0); assert(!r
);