3 * - configuration file parsing
4 * - management of global state
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 2, 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,
25 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
34 #include <sys/types.h>
36 #include <sys/socket.h>
37 #include <netinet/in.h>
38 #include <arpa/inet.h>
42 static void readconfig(adns_state ads
, const char *filename
, int warnmissing
);
44 static void addserver(adns_state ads
, struct in_addr addr
) {
48 for (i
=0; i
<ads
->nservers
; i
++) {
49 if (ads
->servers
[i
].addr
.s_addr
== addr
.s_addr
) {
50 adns__debug(ads
,-1,0,"duplicate nameserver %s ignored",inet_ntoa(addr
));
55 if (ads
->nservers
>=MAXSERVERS
) {
56 adns__diag(ads
,-1,0,"too many nameservers, ignoring %s",inet_ntoa(addr
));
60 ss
= ads
->servers
+ads
->nservers
;
65 static void freesearchlist(adns_state ads
) {
66 if (ads
->nsearchlist
) free(*ads
->searchlist
);
67 free(ads
->searchlist
);
70 static void saveerr(adns_state ads
, int en
) {
71 if (!ads
->configerrno
) ads
->configerrno
= en
;
74 static void configparseerr(adns_state ads
, const char *fn
, int lno
,
75 const char *fmt
, ...) {
79 if (!ads
->logfn
|| (ads
->iflags
& adns_if_noerrprint
)) return;
81 if (lno
==-1) adns__lprintf(ads
,"adns: %s: ",fn
);
82 else adns__lprintf(ads
,"adns: %s:%d: ",fn
,lno
);
84 adns__vlprintf(ads
,fmt
,al
);
86 adns__lprintf(ads
,"\n");
89 static int nextword(const char **bufp_io
, const char **word_r
, int *l_r
) {
93 while (ctype_whitespace(*p
)) p
++;
97 while (*q
&& !ctype_whitespace(*q
)) q
++;
106 static void ccf_nameserver(adns_state ads
, const char *fn
,
107 int lno
, const char *buf
) {
110 if (!inet_aton(buf
,&ia
)) {
111 configparseerr(ads
,fn
,lno
,"invalid nameserver address `%s'",buf
);
114 adns__debug(ads
,-1,0,"using nameserver %s",inet_ntoa(ia
));
118 static void ccf_search(adns_state ads
, const char *fn
,
119 int lno
, const char *buf
) {
120 const char *bufp
, *word
;
121 char *newchars
, **newptrs
, **pp
;
129 while (nextword(&bufp
,&word
,&l
)) { count
++; tl
+= l
+1; }
131 newptrs
= malloc(sizeof(char*)*count
);
132 if (!newptrs
) { saveerr(ads
,errno
); return; }
134 newchars
= malloc(tl
);
135 if (!newchars
) { saveerr(ads
,errno
); free(newptrs
); return; }
139 while (nextword(&bufp
,&word
,&l
)) {
141 memcpy(newchars
,word
,l
);
147 ads
->nsearchlist
= count
;
148 ads
->searchlist
= newptrs
;
151 static void ccf_sortlist(adns_state ads
, const char *fn
,
152 int lno
, const char *buf
) {
154 char tbuf
[200], *slash
, *ep
;
155 const char *maskwhat
;
156 struct in_addr base
, mask
;
158 unsigned long initial
, baselocal
;
163 while (nextword(&buf
,&word
,&l
)) {
164 if (ads
->nsortlist
>= MAXSORTLIST
) {
165 adns__diag(ads
,-1,0,"too many sortlist entries,"
166 " ignoring %.*s onwards",l
,word
);
170 if (l
>= sizeof(tbuf
)) {
171 configparseerr(ads
,fn
,lno
,"sortlist entry `%.*s' too long",l
,word
);
175 memcpy(tbuf
,word
,l
); tbuf
[l
]= 0;
176 slash
= strchr(tbuf
,'/');
177 if (slash
) *slash
++= 0;
179 if (!inet_aton(tbuf
,&base
)) {
180 configparseerr(ads
,fn
,lno
,"invalid address `%s' in sortlist",tbuf
);
185 if (strchr(slash
,'.')) {
187 if (!inet_aton(slash
,&mask
)) {
188 configparseerr(ads
,fn
,lno
,"invalid mask `%s' in sortlist",slash
);
192 maskwhat
= "prefix length";
193 initial
= strtoul(slash
,&ep
,10);
194 if (*ep
|| initial
>32) {
195 configparseerr(ads
,fn
,lno
,"mask length `%s' invalid",slash
);
198 mask
.s_addr
= htonl((0x0ffffffffUL
) << (32-initial
));
201 maskwhat
= "implied mask";
202 baselocal
= ntohl(base
.s_addr
);
203 if (!(baselocal
& 0x080000000UL
)) /* class A */
204 mask
.s_addr
= htonl(0x0ff000000UL
);
205 else if ((baselocal
& 0x0c0000000UL
) == 0x080000000UL
)
206 mask
.s_addr
= htonl(0x0ffff0000UL
); /* class B */
207 else if ((baselocal
& 0x0f0000000UL
) == 0x0e0000000UL
)
208 mask
.s_addr
= htonl(0x0ff000000UL
); /* class C */
210 configparseerr(ads
,fn
,lno
, "network address `%s'"
211 " in sortlist is not in classed ranges,"
212 " must specify mask explicitly", tbuf
);
217 if (base
.s_addr
& ~mask
.s_addr
) {
218 configparseerr(ads
,fn
,lno
, "%s `%s' in sortlist"
219 " overlaps address `%s'",maskwhat
,
220 slash ? slash
: inet_ntoa(mask
), tbuf
);
224 ads
->sortlist
[ads
->nsortlist
].base
= base
;
225 ads
->sortlist
[ads
->nsortlist
].mask
= mask
;
230 static void ccf_options(adns_state ads
, const char *fn
,
231 int lno
, const char *buf
) {
239 while (nextword(&buf
,&word
,&l
)) {
240 if (l
==5 && !memcmp(word
,"debug",5)) {
241 ads
->iflags
|= adns_if_debug
;
244 if (l
>=6 && !memcmp(word
,"ndots:",6)) {
245 v
= strtoul(word
+6,&ep
,10);
246 if (l
==6 || ep
!= word
+l
|| v
> INT_MAX
) {
247 configparseerr(ads
,fn
,lno
,"option `%.*s' malformed"
248 " or has bad value",l
,word
);
254 if (l
>=12 && !memcmp(word
,"adns_checkc:",12)) {
255 if (!strcmp(word
+12,"none")) {
256 ads
->iflags
&= ~adns_if_checkc_freq
;
257 ads
->iflags
|= adns_if_checkc_entex
;
258 } else if (!strcmp(word
+12,"entex")) {
259 ads
->iflags
&= ~adns_if_checkc_freq
;
260 ads
->iflags
|= adns_if_checkc_entex
;
261 } else if (!strcmp(word
+12,"freq")) {
262 ads
->iflags
|= adns_if_checkc_freq
;
264 configparseerr(ads
,fn
,lno
, "option adns_checkc has bad value `%s' "
265 "(must be none, entex or freq", word
+12);
269 adns__diag(ads
,-1,0,"%s:%d: unknown option `%.*s'", fn
,lno
, l
,word
);
273 static void ccf_clearnss(adns_state ads
, const char *fn
,
274 int lno
, const char *buf
) {
278 static void ccf_include(adns_state ads
, const char *fn
,
279 int lno
, const char *buf
) {
281 configparseerr(ads
,fn
,lno
,"`include' directive with no filename");
284 readconfig(ads
,buf
,1);
287 static void ccf_lookup(adns_state ads
, const char *fn
, int lno
,
294 configparseerr(ads
,fn
,lno
,"`lookup' directive with no databases");
298 while (nextword(&buf
,&word
,&l
)) {
299 if (l
==4 && !memcmp(word
,"bind",4)) {
301 } else if (l
==4 && !memcmp(word
,"file",4)) {
302 /* ignore this and hope /etc/hosts is not essential */
303 } else if (l
==2 && !memcmp(word
,"yp",2)) {
304 adns__diag(ads
,-1,0,"%s:%d: yp lookups not supported by adns", fn
,lno
);
307 adns__diag(ads
,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
313 adns__diag(ads
,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn
,lno
);
316 static const struct configcommandinfo
{
318 void (*fn
)(adns_state ads
, const char *fn
, int lno
, const char *buf
);
319 } configcommandinfos
[]= {
320 { "nameserver", ccf_nameserver
},
321 { "domain", ccf_search
},
322 { "search", ccf_search
},
323 { "sortlist", ccf_sortlist
},
324 { "options", ccf_options
},
325 { "clearnameservers", ccf_clearnss
},
326 { "include", ccf_include
},
327 { "lookup", ccf_lookup
}, /* OpenBSD */
336 static int gl_file(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
337 int lno
, char *buf
, int buflen
) {
338 FILE *file
= src_io
->file
;
346 for (;;) { /* loop over chars */
348 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
353 adns__diag(ads
,-1,0,"%s:%d: line contains nul, ignored",filename
,lno
);
355 } else if (c
== '\n') {
357 } else if (c
== EOF
) {
360 adns__diag(ads
,-1,0,"%s:%d: read error: %s",
361 filename
,lno
,strerror(errno
));
377 while ((c
= getc(file
)) != EOF
&& c
!= '\n');
381 static int gl_text(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
382 int lno
, char *buf
, int buflen
) {
383 const char *cp
= src_io
->text
;
386 if (!cp
|| !*cp
) return -1;
388 if (*cp
== ';' || *cp
== '\n') cp
++;
389 l
= strcspn(cp
,";\n");
393 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
403 static void readconfiggeneric(adns_state ads
, const char *filename
,
404 int (*getline
)(adns_state ads
, getline_ctx
*,
405 const char *filename
, int lno
,
406 char *buf
, int buflen
),
407 /* Returns >=0 for success, -1 for EOF or error
408 * (error will have been reported), or -2 for
409 * bad line was encountered, try again.
411 getline_ctx gl_ctx
) {
412 char linebuf
[2000], *p
, *q
;
414 const struct configcommandinfo
*ccip
;
417 (l
= getline(ads
,&gl_ctx
, filename
,lno
, linebuf
,sizeof(linebuf
))) != -1;
419 if (l
== -2) continue;
420 while (l
>0 && ctype_whitespace(linebuf
[l
-1])) l
--;
423 while (ctype_whitespace(*p
)) p
++;
424 if (*p
== '#' || *p
== ';' || !*p
) continue;
426 while (*q
&& !ctype_whitespace(*q
)) q
++;
428 for (ccip
=configcommandinfos
;
430 !(strlen(ccip
->name
)==dirl
&& !memcmp(ccip
->name
,p
,q
-p
));
433 adns__diag(ads
,-1,0,"%s:%d: unknown configuration directive `%.*s'",
434 filename
,lno
,(int)(q
-p
),p
);
437 while (ctype_whitespace(*q
)) q
++;
438 ccip
->fn(ads
,filename
,lno
,q
);
442 static const char *instrum_getenv(adns_state ads
, const char *envvar
) {
445 value
= getenv(envvar
);
446 if (!value
) adns__debug(ads
,-1,0,"environment variable %s not set",envvar
);
447 else adns__debug(ads
,-1,0,"environment variable %s"
448 " set to `%s'",envvar
,value
);
452 static void readconfig(adns_state ads
, const char *filename
, int warnmissing
) {
455 gl_ctx
.file
= fopen(filename
,"r");
457 if (errno
== ENOENT
) {
459 adns__debug(ads
,-1,0, "configuration file"
460 " `%s' does not exist",filename
);
464 adns__diag(ads
,-1,0,"cannot open configuration file `%s': %s",
465 filename
,strerror(errno
));
469 readconfiggeneric(ads
,filename
,gl_file
,gl_ctx
);
474 static void readconfigtext(adns_state ads
, const char *text
,
475 const char *showname
) {
479 readconfiggeneric(ads
,showname
,gl_text
,gl_ctx
);
482 static void readconfigenv(adns_state ads
, const char *envvar
) {
483 const char *filename
;
485 if (ads
->iflags
& adns_if_noenv
) {
486 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
489 filename
= instrum_getenv(ads
,envvar
);
490 if (filename
) readconfig(ads
,filename
,1);
493 static void readconfigenvtext(adns_state ads
, const char *envvar
) {
494 const char *textdata
;
496 if (ads
->iflags
& adns_if_noenv
) {
497 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
500 textdata
= instrum_getenv(ads
,envvar
);
501 if (textdata
) readconfigtext(ads
,textdata
,envvar
);
505 int adns__setnonblock(adns_state ads
, int fd
) {
508 r
= fcntl(fd
,F_GETFL
,0); if (r
<0) return errno
;
510 r
= fcntl(fd
,F_SETFL
,r
); if (r
<0) return errno
;
514 static int init_begin(adns_state
*ads_r
, adns_initflags flags
,
515 adns_logcallbackfn
*logfn
, void *logfndata
) {
519 ads
= malloc(sizeof(*ads
)); if (!ads
) return errno
;
523 ads
->logfndata
= logfndata
;
525 LIST_INIT(ads
->udpw
);
526 LIST_INIT(ads
->tcpw
);
527 LIST_INIT(ads
->childw
);
528 LIST_INIT(ads
->output
);
531 ads
->udpsocket
= ads
->tcpsocket
= -1;
532 adns__vbuf_init(&ads
->tcpsend
);
533 adns__vbuf_init(&ads
->tcprecv
);
534 ads
->tcprecv_skip
= 0;
535 ads
->nservers
= ads
->nsortlist
= ads
->nsearchlist
= ads
->tcpserver
= 0;
537 ads
->tcpstate
= server_disconnected
;
538 timerclear(&ads
->tcptimeout
);
542 ads
->rand48xsubi
[0]= pid
;
543 ads
->rand48xsubi
[1]= (unsigned long)pid
>> 16;
544 ads
->rand48xsubi
[2]= pid
^ ((unsigned long)pid
>> 16);
550 static int init_finish(adns_state ads
) {
552 struct protoent
*proto
;
555 if (!ads
->nservers
) {
556 if (ads
->logfn
&& ads
->iflags
& adns_if_debug
)
557 adns__lprintf(ads
,"adns: no nameservers, using localhost\n");
558 ia
.s_addr
= htonl(INADDR_LOOPBACK
);
562 proto
= getprotobyname("udp"); if (!proto
) { r
= ENOPROTOOPT
; goto x_free
; }
563 ads
->udpsocket
= socket(AF_INET
,SOCK_DGRAM
,proto
->p_proto
);
564 if (ads
->udpsocket
<0) { r
= errno
; goto x_free
; }
566 r
= adns__setnonblock(ads
,ads
->udpsocket
);
567 if (r
) { r
= errno
; goto x_closeudp
; }
572 close(ads
->udpsocket
);
578 static void init_abort(adns_state ads
) {
579 if (ads
->nsearchlist
) {
580 free(ads
->searchlist
[0]);
581 free(ads
->searchlist
);
586 static void logfn_file(adns_state ads
, void *logfndata
,
587 const char *fmt
, va_list al
) {
588 vfprintf(logfndata
,fmt
,al
);
591 static int init_files(adns_state
*ads_r
, adns_initflags flags
,
592 adns_logcallbackfn
*logfn
, void *logfndata
) {
594 const char *res_options
, *adns_res_options
;
597 r
= init_begin(&ads
, flags
, logfn
, logfndata
);
600 res_options
= instrum_getenv(ads
,"RES_OPTIONS");
601 adns_res_options
= instrum_getenv(ads
,"ADNS_RES_OPTIONS");
602 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
603 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
605 readconfig(ads
,"/etc/resolv.conf",1);
606 readconfig(ads
,"/etc/resolv-adns.conf",0);
607 readconfigenv(ads
,"RES_CONF");
608 readconfigenv(ads
,"ADNS_RES_CONF");
610 readconfigenvtext(ads
,"RES_CONF_TEXT");
611 readconfigenvtext(ads
,"ADNS_RES_CONF_TEXT");
613 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
614 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
616 ccf_search(ads
,"LOCALDOMAIN",-1,instrum_getenv(ads
,"LOCALDOMAIN"));
617 ccf_search(ads
,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads
,"ADNS_LOCALDOMAIN"));
619 if (ads
->configerrno
&& ads
->configerrno
!= EINVAL
) {
628 adns__consistency(ads
,0,cc_entex
);
633 int adns_init(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
634 return init_files(ads_r
, flags
, logfn_file
, diagfile ? diagfile
: stderr
);
637 static int init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
638 adns_logcallbackfn
*logfn
, void *logfndata
,
639 const char *configtext
) {
643 r
= init_begin(&ads
, flags
, logfn
, logfndata
);
646 readconfigtext(ads
,configtext
,"<supplied configuration text>");
647 if (ads
->configerrno
) {
653 r
= init_finish(ads
); if (r
) return r
;
654 adns__consistency(ads
,0,cc_entex
);
659 int adns_init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
660 FILE *diagfile
, const char *configtext
) {
661 return init_strcfg(ads_r
, flags
,
662 diagfile ? logfn_file
: 0, diagfile
,
666 int adns_init_logfn(adns_state
*newstate_r
, adns_initflags flags
,
667 const char *configtext
/*0=>use default config files*/,
668 adns_logcallbackfn
*logfn
/*0=>logfndata is a FILE* */,
669 void *logfndata
/*0 with logfn==0 => discard*/) {
670 if (!logfn
&& logfndata
)
673 return init_strcfg(newstate_r
, flags
, logfn
, logfndata
, configtext
);
675 return init_files(newstate_r
, flags
, logfn
, logfndata
);
678 void adns_finish(adns_state ads
) {
679 adns__consistency(ads
,0,cc_entex
);
681 if (ads
->udpw
.head
) adns_cancel(ads
->udpw
.head
);
682 else if (ads
->tcpw
.head
) adns_cancel(ads
->tcpw
.head
);
683 else if (ads
->childw
.head
) adns_cancel(ads
->childw
.head
);
684 else if (ads
->output
.head
) adns_cancel(ads
->output
.head
);
687 close(ads
->udpsocket
);
688 if (ads
->tcpsocket
>= 0) close(ads
->tcpsocket
);
689 adns__vbuf_free(&ads
->tcpsend
);
690 adns__vbuf_free(&ads
->tcprecv
);
695 void adns_forallqueries_begin(adns_state ads
) {
696 adns__consistency(ads
,0,cc_entex
);
698 ads
->udpw
.head ? ads
->udpw
.head
:
699 ads
->tcpw
.head ? ads
->tcpw
.head
:
700 ads
->childw
.head ? ads
->childw
.head
:
704 adns_query
adns_forallqueries_next(adns_state ads
, void **context_r
) {
707 adns__consistency(ads
,0,cc_entex
);
708 nqu
= ads
->forallnext
;
714 } else if (qu
== ads
->udpw
.tail
) {
716 ads
->tcpw
.head ? ads
->tcpw
.head
:
717 ads
->childw
.head ? ads
->childw
.head
:
719 } else if (qu
== ads
->tcpw
.tail
) {
721 ads
->childw
.head ? ads
->childw
.head
:
723 } else if (qu
== ads
->childw
.tail
) {
724 nqu
= ads
->output
.head
;
728 if (!qu
->parent
) break;
730 ads
->forallnext
= nqu
;
731 if (context_r
) *context_r
= qu
->ctx
.ext
;