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 struct in_addr base
, mask
;
157 unsigned long initial
, baselocal
;
162 while (nextword(&buf
,&word
,&l
)) {
163 if (ads
->nsortlist
>= MAXSORTLIST
) {
164 adns__diag(ads
,-1,0,"too many sortlist entries,"
165 " ignoring %.*s onwards",l
,word
);
169 if (l
>= sizeof(tbuf
)) {
170 configparseerr(ads
,fn
,lno
,"sortlist entry `%.*s' too long",l
,word
);
174 memcpy(tbuf
,word
,l
); tbuf
[l
]= 0;
175 slash
= strchr(tbuf
,'/');
176 if (slash
) *slash
++= 0;
178 if (!inet_aton(tbuf
,&base
)) {
179 configparseerr(ads
,fn
,lno
,"invalid address `%s' in sortlist",tbuf
);
184 if (strchr(slash
,'.')) {
185 if (!inet_aton(slash
,&mask
)) {
186 configparseerr(ads
,fn
,lno
,"invalid mask `%s' in sortlist",slash
);
189 if (base
.s_addr
& ~mask
.s_addr
) {
190 configparseerr(ads
,fn
,lno
, "mask `%s' in sortlist"
191 " overlaps address `%s'",slash
,tbuf
);
195 initial
= strtoul(slash
,&ep
,10);
196 if (*ep
|| initial
>32) {
197 configparseerr(ads
,fn
,lno
,"mask length `%s' invalid",slash
);
200 mask
.s_addr
= htonl((0x0ffffffffUL
) << (32-initial
));
203 baselocal
= ntohl(base
.s_addr
);
204 if (!baselocal
& 0x080000000UL
) /* class A */
205 mask
.s_addr
= htonl(0x0ff000000UL
);
206 else if ((baselocal
& 0x0c0000000UL
) == 0x080000000UL
)
207 mask
.s_addr
= htonl(0x0ffff0000UL
); /* class B */
208 else if ((baselocal
& 0x0f0000000UL
) == 0x0e0000000UL
)
209 mask
.s_addr
= htonl(0x0ff000000UL
); /* class C */
211 configparseerr(ads
,fn
,lno
, "network address `%s'"
212 " in sortlist is not in classed ranges,"
213 " must specify mask explicitly", tbuf
);
218 ads
->sortlist
[ads
->nsortlist
].base
= base
;
219 ads
->sortlist
[ads
->nsortlist
].mask
= mask
;
224 static void ccf_options(adns_state ads
, const char *fn
,
225 int lno
, const char *buf
) {
233 while (nextword(&buf
,&word
,&l
)) {
234 if (l
==5 && !memcmp(word
,"debug",5)) {
235 ads
->iflags
|= adns_if_debug
;
238 if (l
>=6 && !memcmp(word
,"ndots:",6)) {
239 v
= strtoul(word
+6,&ep
,10);
240 if (l
==6 || ep
!= word
+l
|| v
> INT_MAX
) {
241 configparseerr(ads
,fn
,lno
,"option `%.*s' malformed"
242 " or has bad value",l
,word
);
248 if (l
>=12 && !memcmp(word
,"adns_checkc:",12)) {
249 if (!strcmp(word
+12,"none")) {
250 ads
->iflags
&= ~adns_if_checkc_freq
;
251 ads
->iflags
|= adns_if_checkc_entex
;
252 } else if (!strcmp(word
+12,"entex")) {
253 ads
->iflags
&= ~adns_if_checkc_freq
;
254 ads
->iflags
|= adns_if_checkc_entex
;
255 } else if (!strcmp(word
+12,"freq")) {
256 ads
->iflags
|= adns_if_checkc_freq
;
258 configparseerr(ads
,fn
,lno
, "option adns_checkc has bad value `%s' "
259 "(must be none, entex or freq", word
+12);
263 adns__diag(ads
,-1,0,"%s:%d: unknown option `%.*s'", fn
,lno
, l
,word
);
267 static void ccf_clearnss(adns_state ads
, const char *fn
,
268 int lno
, const char *buf
) {
272 static void ccf_include(adns_state ads
, const char *fn
,
273 int lno
, const char *buf
) {
275 configparseerr(ads
,fn
,lno
,"`include' directive with no filename");
278 readconfig(ads
,buf
,1);
281 static void ccf_lookup(adns_state ads
, const char *fn
, int lno
,
288 configparseerr(ads
,fn
,lno
,"`lookup' directive with no databases");
292 while (nextword(&buf
,&word
,&l
)) {
293 if (l
==4 && !memcmp(word
,"bind",4)) {
295 } else if (l
==4 && !memcmp(word
,"file",4)) {
296 /* ignore this and hope /etc/hosts is not essential */
297 } else if (l
==2 && !memcmp(word
,"yp",2)) {
298 adns__diag(ads
,-1,0,"%s:%d: yp lookups not supported by adns", fn
,lno
);
301 adns__diag(ads
,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
307 adns__diag(ads
,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn
,lno
);
310 static const struct configcommandinfo
{
312 void (*fn
)(adns_state ads
, const char *fn
, int lno
, const char *buf
);
313 } configcommandinfos
[]= {
314 { "nameserver", ccf_nameserver
},
315 { "domain", ccf_search
},
316 { "search", ccf_search
},
317 { "sortlist", ccf_sortlist
},
318 { "options", ccf_options
},
319 { "clearnameservers", ccf_clearnss
},
320 { "include", ccf_include
},
321 { "lookup", ccf_lookup
}, /* OpenBSD */
330 static int gl_file(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
331 int lno
, char *buf
, int buflen
) {
332 FILE *file
= src_io
->file
;
340 for (;;) { /* loop over chars */
342 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
347 adns__diag(ads
,-1,0,"%s:%d: line contains nul, ignored",filename
,lno
);
349 } else if (c
== '\n') {
351 } else if (c
== EOF
) {
354 adns__diag(ads
,-1,0,"%s:%d: read error: %s",
355 filename
,lno
,strerror(errno
));
371 while ((c
= getc(file
)) != EOF
&& c
!= '\n');
375 static int gl_text(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
376 int lno
, char *buf
, int buflen
) {
377 const char *cp
= src_io
->text
;
380 if (!cp
|| !*cp
) return -1;
382 if (*cp
== ';' || *cp
== '\n') cp
++;
383 l
= strcspn(cp
,";\n");
387 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
397 static void readconfiggeneric(adns_state ads
, const char *filename
,
398 int (*getline
)(adns_state ads
, getline_ctx
*,
399 const char *filename
, int lno
,
400 char *buf
, int buflen
),
401 /* Returns >=0 for success, -1 for EOF or error
402 * (error will have been reported), or -2 for
403 * bad line was encountered, try again.
405 getline_ctx gl_ctx
) {
406 char linebuf
[2000], *p
, *q
;
408 const struct configcommandinfo
*ccip
;
411 (l
= getline(ads
,&gl_ctx
, filename
,lno
, linebuf
,sizeof(linebuf
))) != -1;
413 if (l
== -2) continue;
414 while (l
>0 && ctype_whitespace(linebuf
[l
-1])) l
--;
417 while (ctype_whitespace(*p
)) p
++;
418 if (*p
== '#' || *p
== ';' || !*p
) continue;
420 while (*q
&& !ctype_whitespace(*q
)) q
++;
422 for (ccip
=configcommandinfos
;
424 !(strlen(ccip
->name
)==dirl
&& !memcmp(ccip
->name
,p
,q
-p
));
427 adns__diag(ads
,-1,0,"%s:%d: unknown configuration directive `%.*s'",
428 filename
,lno
,(int)(q
-p
),p
);
431 while (ctype_whitespace(*q
)) q
++;
432 ccip
->fn(ads
,filename
,lno
,q
);
436 static const char *instrum_getenv(adns_state ads
, const char *envvar
) {
439 value
= getenv(envvar
);
440 if (!value
) adns__debug(ads
,-1,0,"environment variable %s not set",envvar
);
441 else adns__debug(ads
,-1,0,"environment variable %s"
442 " set to `%s'",envvar
,value
);
446 static void readconfig(adns_state ads
, const char *filename
, int warnmissing
) {
449 gl_ctx
.file
= fopen(filename
,"r");
451 if (errno
== ENOENT
) {
453 adns__debug(ads
,-1,0, "configuration file"
454 " `%s' does not exist",filename
);
458 adns__diag(ads
,-1,0,"cannot open configuration file `%s': %s",
459 filename
,strerror(errno
));
463 readconfiggeneric(ads
,filename
,gl_file
,gl_ctx
);
468 static void readconfigtext(adns_state ads
, const char *text
,
469 const char *showname
) {
473 readconfiggeneric(ads
,showname
,gl_text
,gl_ctx
);
476 static void readconfigenv(adns_state ads
, const char *envvar
) {
477 const char *filename
;
479 if (ads
->iflags
& adns_if_noenv
) {
480 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
483 filename
= instrum_getenv(ads
,envvar
);
484 if (filename
) readconfig(ads
,filename
,1);
487 static void readconfigenvtext(adns_state ads
, const char *envvar
) {
488 const char *textdata
;
490 if (ads
->iflags
& adns_if_noenv
) {
491 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
494 textdata
= instrum_getenv(ads
,envvar
);
495 if (textdata
) readconfigtext(ads
,textdata
,envvar
);
499 int adns__setnonblock(adns_state ads
, int fd
) {
502 r
= fcntl(fd
,F_GETFL
,0); if (r
<0) return errno
;
504 r
= fcntl(fd
,F_SETFL
,r
); if (r
<0) return errno
;
508 static int init_begin(adns_state
*ads_r
, adns_initflags flags
,
509 adns_logcallbackfn
*logfn
, void *logfndata
) {
513 ads
= malloc(sizeof(*ads
)); if (!ads
) return errno
;
517 ads
->logfndata
= logfndata
;
519 LIST_INIT(ads
->udpw
);
520 LIST_INIT(ads
->tcpw
);
521 LIST_INIT(ads
->childw
);
522 LIST_INIT(ads
->output
);
525 ads
->udpsocket
= ads
->tcpsocket
= -1;
526 adns__vbuf_init(&ads
->tcpsend
);
527 adns__vbuf_init(&ads
->tcprecv
);
528 ads
->tcprecv_skip
= 0;
529 ads
->nservers
= ads
->nsortlist
= ads
->nsearchlist
= ads
->tcpserver
= 0;
531 ads
->tcpstate
= server_disconnected
;
532 timerclear(&ads
->tcptimeout
);
536 ads
->rand48xsubi
[0]= pid
;
537 ads
->rand48xsubi
[1]= (unsigned long)pid
>> 16;
538 ads
->rand48xsubi
[2]= pid
^ ((unsigned long)pid
>> 16);
544 static int init_finish(adns_state ads
) {
546 struct protoent
*proto
;
549 if (!ads
->nservers
) {
550 if (ads
->logfn
&& ads
->iflags
& adns_if_debug
)
551 adns__lprintf(ads
,"adns: no nameservers, using localhost\n");
552 ia
.s_addr
= htonl(INADDR_LOOPBACK
);
556 proto
= getprotobyname("udp"); if (!proto
) { r
= ENOPROTOOPT
; goto x_free
; }
557 ads
->udpsocket
= socket(AF_INET
,SOCK_DGRAM
,proto
->p_proto
);
558 if (ads
->udpsocket
<0) { r
= errno
; goto x_free
; }
560 r
= adns__setnonblock(ads
,ads
->udpsocket
);
561 if (r
) { r
= errno
; goto x_closeudp
; }
566 close(ads
->udpsocket
);
572 static void init_abort(adns_state ads
) {
573 if (ads
->nsearchlist
) {
574 free(ads
->searchlist
[0]);
575 free(ads
->searchlist
);
580 static void logfn_file(adns_state ads
, void *logfndata
,
581 const char *fmt
, va_list al
) {
582 vfprintf(logfndata
,fmt
,al
);
585 static int init_files(adns_state
*ads_r
, adns_initflags flags
,
586 adns_logcallbackfn
*logfn
, void *logfndata
) {
588 const char *res_options
, *adns_res_options
;
591 r
= init_begin(&ads
, flags
, logfn
, logfndata
);
594 res_options
= instrum_getenv(ads
,"RES_OPTIONS");
595 adns_res_options
= instrum_getenv(ads
,"ADNS_RES_OPTIONS");
596 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
597 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
599 readconfig(ads
,"/etc/resolv.conf",1);
600 readconfig(ads
,"/etc/resolv-adns.conf",0);
601 readconfigenv(ads
,"RES_CONF");
602 readconfigenv(ads
,"ADNS_RES_CONF");
604 readconfigenvtext(ads
,"RES_CONF_TEXT");
605 readconfigenvtext(ads
,"ADNS_RES_CONF_TEXT");
607 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
608 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
610 ccf_search(ads
,"LOCALDOMAIN",-1,instrum_getenv(ads
,"LOCALDOMAIN"));
611 ccf_search(ads
,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads
,"ADNS_LOCALDOMAIN"));
613 if (ads
->configerrno
&& ads
->configerrno
!= EINVAL
) {
622 adns__consistency(ads
,0,cc_entex
);
627 int adns_init(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
628 return init_files(ads_r
, flags
, logfn_file
, diagfile ? diagfile
: stderr
);
631 static int init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
632 adns_logcallbackfn
*logfn
, void *logfndata
,
633 const char *configtext
) {
637 r
= init_begin(&ads
, flags
, logfn
, logfndata
);
640 readconfigtext(ads
,configtext
,"<supplied configuration text>");
641 if (ads
->configerrno
) {
647 r
= init_finish(ads
); if (r
) return r
;
648 adns__consistency(ads
,0,cc_entex
);
653 int adns_init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
654 FILE *diagfile
, const char *configtext
) {
655 return init_strcfg(ads_r
, flags
,
656 diagfile ? logfn_file
: 0, diagfile
,
660 int adns_init_logfn(adns_state
*newstate_r
, adns_initflags flags
,
661 const char *configtext
/*0=>use default config files*/,
662 adns_logcallbackfn
*logfn
/*0=>logfndata is a FILE* */,
663 void *logfndata
/*0 with logfn==0 => discard*/) {
664 if (!logfn
&& logfndata
)
667 return init_strcfg(newstate_r
, flags
, logfn
, logfndata
, configtext
);
669 return init_files(newstate_r
, flags
, logfn
, logfndata
);
672 void adns_finish(adns_state ads
) {
673 adns__consistency(ads
,0,cc_entex
);
675 if (ads
->udpw
.head
) adns_cancel(ads
->udpw
.head
);
676 else if (ads
->tcpw
.head
) adns_cancel(ads
->tcpw
.head
);
677 else if (ads
->childw
.head
) adns_cancel(ads
->childw
.head
);
678 else if (ads
->output
.head
) adns_cancel(ads
->output
.head
);
681 close(ads
->udpsocket
);
682 if (ads
->tcpsocket
>= 0) close(ads
->tcpsocket
);
683 adns__vbuf_free(&ads
->tcpsend
);
684 adns__vbuf_free(&ads
->tcprecv
);
689 void adns_forallqueries_begin(adns_state ads
) {
690 adns__consistency(ads
,0,cc_entex
);
692 ads
->udpw
.head ? ads
->udpw
.head
:
693 ads
->tcpw
.head ? ads
->tcpw
.head
:
694 ads
->childw
.head ? ads
->childw
.head
:
698 adns_query
adns_forallqueries_next(adns_state ads
, void **context_r
) {
701 adns__consistency(ads
,0,cc_entex
);
702 nqu
= ads
->forallnext
;
708 } else if (qu
== ads
->udpw
.tail
) {
710 ads
->tcpw
.head ? ads
->tcpw
.head
:
711 ads
->childw
.head ? ads
->childw
.head
:
713 } else if (qu
== ads
->tcpw
.tail
) {
715 ads
->childw
.head ? ads
->childw
.head
:
717 } else if (qu
== ads
->childw
.tail
) {
718 nqu
= ads
->output
.head
;
722 if (!qu
->parent
) break;
724 ads
->forallnext
= nqu
;
725 if (context_r
) *context_r
= qu
->ctx
.ext
;