3 * - diagnostic functions
7 * This file is part of adns, which is
8 * Copyright (C) 1997-2000,2003,2006 Ian Jackson
9 * Copyright (C) 1999-2000,2003,2006 Tony Finch
10 * Copyright (C) 1991 Massachusetts Institute of Technology
11 * (See the file INSTALL for full details.)
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 3, or (at your option)
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software Foundation.
30 #include <sys/types.h>
31 #include <sys/socket.h>
32 #include <netinet/in.h>
33 #include <arpa/inet.h>
37 /* Core diagnostic functions */
39 void adns__vlprintf(adns_state ads
, const char *fmt
, va_list al
) {
40 ads
->logfn(ads
,ads
->logfndata
,fmt
,al
);
43 void adns__lprintf(adns_state ads
, const char *fmt
, ...) {
46 adns__vlprintf(ads
,fmt
,al
);
50 void adns__vdiag(adns_state ads
, const char *pfx
, adns_initflags prevent
,
51 int serv
, adns_query qu
, const char *fmt
, va_list al
) {
52 char buf
[ADNS_ADDR2TEXT_BUFLEN
];
53 const char *bef
, *aft
;
57 (!(ads
->iflags
& adns_if_debug
)
58 && (!prevent
|| (ads
->iflags
& prevent
))))
61 if (ads
->iflags
& adns_if_logpid
) {
62 adns__lprintf(ads
,"adns%s [%ld]: ",pfx
,(long)getpid());
64 adns__lprintf(ads
,"adns%s: ",pfx
);
67 adns__vlprintf(ads
,fmt
,al
);
72 if (qu
&& qu
->query_dgram
) {
74 adns__lprintf(ads
,"%sQNAME=%s, QTYPE=%s",
76 adns__diag_domain(qu
->ads
,-1,0, &vb
,
77 qu
->query_dgram
,qu
->query_dglen
,DNS_HDRSIZE
),
78 qu
->typei ? qu
->typei
->rrtname
: "<unknown>");
79 if (qu
->typei
&& qu
->typei
->fmtname
)
80 adns__lprintf(ads
,"(%s)",qu
->typei
->fmtname
);
86 adns__lprintf(ads
,"%sNS=%s",bef
,
87 adns__sockaddr_ntoa(&ads
->servers
[serv
].addr
.sa
, buf
));
91 adns__lprintf(ads
,"%s",aft
);
94 void adns__debug(adns_state ads
, int serv
, adns_query qu
,
95 const char *fmt
, ...) {
99 adns__vdiag(ads
," debug",0,serv
,qu
,fmt
,al
);
103 void adns__warn(adns_state ads
, int serv
, adns_query qu
,
104 const char *fmt
, ...) {
108 adns__vdiag(ads
," warning",
109 adns_if_noerrprint
|adns_if_noserverwarn
, serv
,qu
,fmt
,al
);
113 void adns__diag(adns_state ads
, int serv
, adns_query qu
,
114 const char *fmt
, ...) {
118 adns__vdiag(ads
,"",adns_if_noerrprint
,serv
,qu
,fmt
,al
);
124 void adns__vbuf_init(vbuf
*vb
) {
125 vb
->used
= vb
->avail
= 0; vb
->buf
= 0;
128 int adns__vbuf_ensure(vbuf
*vb
, int want
) {
131 if (vb
->avail
>= want
) return 1;
132 nb
= realloc(vb
->buf
,want
); if (!nb
) return 0;
138 void adns__vbuf_appendq(vbuf
*vb
, const byte
*data
, int len
) {
139 memcpy(vb
->buf
+vb
->used
,data
,len
);
143 int adns__vbuf_append(vbuf
*vb
, const byte
*data
, int len
) {
147 newlen
= vb
->used
+len
;
148 if (vb
->avail
< newlen
) {
149 if (newlen
<20) newlen
= 20;
151 nb
= realloc(vb
->buf
,newlen
);
152 if (!nb
) { newlen
= vb
->used
+len
; nb
= realloc(vb
->buf
,newlen
); }
157 adns__vbuf_appendq(vb
,data
,len
);
161 int adns__vbuf_appendstr(vbuf
*vb
, const char *data
) {
164 return adns__vbuf_append(vb
,data
,l
);
167 void adns__vbuf_free(vbuf
*vb
) {
172 /* Additional diagnostic functions */
174 const char *adns__diag_domain(adns_state ads
, int serv
, adns_query qu
,
175 vbuf
*vb
, const byte
*dgram
,
176 int dglen
, int cbyte
) {
179 st
= adns__parse_domain(ads
,serv
,qu
,vb
, pdf_quoteok
,
180 dgram
,dglen
,&cbyte
,dglen
);
181 if (st
== adns_s_nomemory
) {
182 return "<cannot report domain... out of memory>";
186 if (!(adns__vbuf_appendstr(vb
,"<bad format... ") &&
187 adns__vbuf_appendstr(vb
,adns_strerror(st
)) &&
188 adns__vbuf_appendstr(vb
,">") &&
189 adns__vbuf_append(vb
,"",1))) {
190 return "<cannot report bad format... out of memory>";
194 adns__vbuf_appendstr(vb
,"<truncated ...>");
195 adns__vbuf_append(vb
,"",1);
200 int adns__getrrsz_default(const typeinfo
*typei
, adns_rrtype type
)
201 { return typei
->fixed_rrsz
; }
203 adns_status
adns_rr_info(adns_rrtype type
,
204 const char **rrtname_r
, const char **fmtname_r
,
206 const void *datap
, char **data_r
) {
207 const typeinfo
*typei
;
211 typei
= adns__findtype(type
);
212 if (!typei
) return adns_s_unknownrrtype
;
214 if (rrtname_r
) *rrtname_r
= typei
->rrtname
;
215 if (fmtname_r
) *fmtname_r
= typei
->fmtname
;
216 if (len_r
) *len_r
= typei
->getrrsz(typei
, type
);
218 if (!datap
) return adns_s_ok
;
220 adns__vbuf_init(&vb
);
221 st
= typei
->convstring(&vb
,datap
);
222 if (st
) goto x_freevb
;
223 if (!adns__vbuf_append(&vb
,"",1)) { st
= adns_s_nomemory
; goto x_freevb
; }
224 assert(strlen(vb
.buf
) == vb
.used
-1);
225 *data_r
= realloc(vb
.buf
,vb
.used
);
226 if (!*data_r
) *data_r
= vb
.buf
;
230 adns__vbuf_free(&vb
);
235 #define SINFO(n,s) { adns_s_##n, #n, s }
237 static const struct sinfo
{
244 SINFO( nomemory
, "Out of memory" ),
245 SINFO( unknownrrtype
, "Query not implemented in DNS library" ),
246 SINFO( systemfail
, "General resolver or system failure" ),
248 SINFO( timeout
, "DNS query timed out" ),
249 SINFO( allservfail
, "All nameservers failed" ),
250 SINFO( norecurse
, "Recursion denied by nameserver" ),
251 SINFO( invalidresponse
, "Nameserver sent bad response" ),
252 SINFO( unknownformat
, "Nameserver used unknown format" ),
254 SINFO( rcodeservfail
, "Nameserver reports failure" ),
255 SINFO( rcodeformaterror
, "Query not understood by nameserver" ),
256 SINFO( rcodenotimplemented
, "Query not implemented by nameserver" ),
257 SINFO( rcoderefused
, "Query refused by nameserver" ),
258 SINFO( rcodeunknown
, "Nameserver sent unknown response code" ),
260 SINFO( inconsistent
, "Inconsistent resource records in DNS" ),
261 SINFO( prohibitedcname
, "DNS alias found where canonical name wanted" ),
262 SINFO( answerdomaininvalid
, "Found syntactically invalid domain name" ),
263 SINFO( answerdomaintoolong
, "Found overly-long domain name" ),
264 SINFO( invaliddata
, "Found invalid DNS data" ),
266 SINFO( querydomainwrong
, "Domain invalid for particular DNS query type" ),
267 SINFO( querydomaininvalid
, "Domain name is syntactically invalid" ),
268 SINFO( querydomaintoolong
, "Domain name or component is too long" ),
270 SINFO( nxdomain
, "No such domain" ),
271 SINFO( nodata
, "No such data" )
274 static int si_compar(const void *key
, const void *elem
) {
275 const adns_status
*st
= key
;
276 const struct sinfo
*si
= elem
;
278 return *st
< si
->st ?
-1 : *st
> si
->st ?
1 : 0;
281 static const struct sinfo
*findsinfo(adns_status st
) {
282 return bsearch(&st
,sinfos
, sizeof(sinfos
)/sizeof(*sinfos
),
283 sizeof(*sinfos
), si_compar
);
286 const char *adns_strerror(adns_status st
) {
287 const struct sinfo
*si
;
293 const char *adns_errabbrev(adns_status st
) {
294 const struct sinfo
*si
;
301 #define STINFO(max) { adns_s_max_##max, #max }
303 static const struct stinfo
{
309 STINFO( remotefail
),
316 static int sti_compar(const void *key
, const void *elem
) {
317 const adns_status
*st
= key
;
318 const struct stinfo
*sti
= elem
;
320 adns_status here
, min
, max
;
323 min
= (sti
==stinfos
) ?
0 : sti
[-1].stmax
+1;
326 return here
< min ?
-1 : here
> max ?
1 : 0;
329 const char *adns_errtypeabbrev(adns_status st
) {
330 const struct stinfo
*sti
;
332 sti
= bsearch(&st
,stinfos
, sizeof(stinfos
)/sizeof(*stinfos
),
333 sizeof(*stinfos
), sti_compar
);
338 void adns__isort(void *array
, int nobjs
, int sz
, void *tempbuf
,
339 int (*needswap
)(void *context
, const void *a
, const void *b
),
344 for (i
=0; i
<nobjs
; i
++) {
346 place
>0 && needswap(context
, data
+ (place
-1)*sz
, data
+ i
*sz
);
349 memcpy(tempbuf
, data
+ i
*sz
, sz
);
350 memmove(data
+ (place
+1)*sz
, data
+ place
*sz
, (i
-place
)*sz
);
351 memcpy(data
+ place
*sz
, tempbuf
, sz
);
356 /* SIGPIPE protection. */
358 void adns__sigpipe_protect(adns_state ads
) {
363 if (ads
->iflags
& adns_if_nosigpipe
) return;
365 sigfillset(&toblock
);
366 sigdelset(&toblock
,SIGPIPE
);
368 sa
.sa_handler
= SIG_IGN
;
369 sigfillset(&sa
.sa_mask
);
372 r
= sigprocmask(SIG_SETMASK
,&toblock
,&ads
->stdsigmask
); assert(!r
);
373 r
= sigaction(SIGPIPE
,&sa
,&ads
->stdsigpipe
); assert(!r
);
376 void adns__sigpipe_unprotect(adns_state ads
) {
379 if (ads
->iflags
& adns_if_nosigpipe
) return;
381 r
= sigaction(SIGPIPE
,&ads
->stdsigpipe
,0); assert(!r
);
382 r
= sigprocmask(SIG_SETMASK
,&ads
->stdsigmask
,0); assert(!r
);