3 * - configuration file parsing
4 * - management of global state
8 * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
10 * It is part of adns, which is
11 * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
12 * Copyright (C) 1999-2000 Tony Finch <dot@dotat.at>
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
35 #include <sys/types.h>
37 #include <sys/socket.h>
38 #include <netinet/in.h>
39 #include <arpa/inet.h>
43 static void readconfig(adns_state ads
, const char *filename
, int warnmissing
);
45 static void addserver(adns_state ads
, struct in_addr addr
) {
49 for (i
=0; i
<ads
->nservers
; i
++) {
50 if (ads
->servers
[i
].addr
.s_addr
== addr
.s_addr
) {
51 adns__debug(ads
,-1,0,"duplicate nameserver %s ignored",inet_ntoa(addr
));
56 if (ads
->nservers
>=MAXSERVERS
) {
57 adns__diag(ads
,-1,0,"too many nameservers, ignoring %s",inet_ntoa(addr
));
61 ss
= ads
->servers
+ads
->nservers
;
66 static void freesearchlist(adns_state ads
) {
67 if (ads
->nsearchlist
) free(*ads
->searchlist
);
68 free(ads
->searchlist
);
71 static void saveerr(adns_state ads
, int en
) {
72 if (!ads
->configerrno
) ads
->configerrno
= en
;
75 static void configparseerr(adns_state ads
, const char *fn
, int lno
,
76 const char *fmt
, ...) {
80 if (!ads
->logfn
|| (ads
->iflags
& adns_if_noerrprint
)) return;
82 if (lno
==-1) adns__lprintf(ads
,"adns: %s: ",fn
);
83 else adns__lprintf(ads
,"adns: %s:%d: ",fn
,lno
);
85 adns__vlprintf(ads
,fmt
,al
);
87 adns__lprintf(ads
,"\n");
90 static int nextword(const char **bufp_io
, const char **word_r
, int *l_r
) {
94 while (ctype_whitespace(*p
)) p
++;
98 while (*q
&& !ctype_whitespace(*q
)) q
++;
107 static void ccf_nameserver(adns_state ads
, const char *fn
,
108 int lno
, const char *buf
) {
111 if (!inet_aton(buf
,&ia
)) {
112 configparseerr(ads
,fn
,lno
,"invalid nameserver address `%s'",buf
);
115 adns__debug(ads
,-1,0,"using nameserver %s",inet_ntoa(ia
));
119 static void ccf_search(adns_state ads
, const char *fn
,
120 int lno
, const char *buf
) {
121 const char *bufp
, *word
;
122 char *newchars
, **newptrs
, **pp
;
130 while (nextword(&bufp
,&word
,&l
)) { count
++; tl
+= l
+1; }
132 newptrs
= malloc(sizeof(char*)*count
);
133 if (!newptrs
) { saveerr(ads
,errno
); return; }
135 newchars
= malloc(tl
);
136 if (!newchars
) { saveerr(ads
,errno
); free(newptrs
); return; }
140 while (nextword(&bufp
,&word
,&l
)) {
142 memcpy(newchars
,word
,l
);
148 ads
->nsearchlist
= count
;
149 ads
->searchlist
= newptrs
;
152 static void ccf_sortlist(adns_state ads
, const char *fn
,
153 int lno
, const char *buf
) {
155 char tbuf
[200], *slash
, *ep
;
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
,'.')) {
186 if (!inet_aton(slash
,&mask
)) {
187 configparseerr(ads
,fn
,lno
,"invalid mask `%s' in sortlist",slash
);
190 if (base
.s_addr
& ~mask
.s_addr
) {
191 configparseerr(ads
,fn
,lno
, "mask `%s' in sortlist"
192 " overlaps address `%s'",slash
,tbuf
);
196 initial
= strtoul(slash
,&ep
,10);
197 if (*ep
|| initial
>32) {
198 configparseerr(ads
,fn
,lno
,"mask length `%s' invalid",slash
);
201 mask
.s_addr
= htonl((0x0ffffffffUL
) << (32-initial
));
204 baselocal
= ntohl(base
.s_addr
);
205 if (!baselocal
& 0x080000000UL
) /* class A */
206 mask
.s_addr
= htonl(0x0ff000000UL
);
207 else if ((baselocal
& 0x0c0000000UL
) == 0x080000000UL
)
208 mask
.s_addr
= htonl(0x0ffff0000UL
); /* class B */
209 else if ((baselocal
& 0x0f0000000UL
) == 0x0e0000000UL
)
210 mask
.s_addr
= htonl(0x0ff000000UL
); /* class C */
212 configparseerr(ads
,fn
,lno
, "network address `%s'"
213 " in sortlist is not in classed ranges,"
214 " must specify mask explicitly", tbuf
);
219 ads
->sortlist
[ads
->nsortlist
].base
= base
;
220 ads
->sortlist
[ads
->nsortlist
].mask
= mask
;
225 static void ccf_options(adns_state ads
, const char *fn
,
226 int lno
, const char *buf
) {
234 while (nextword(&buf
,&word
,&l
)) {
235 if (l
==5 && !memcmp(word
,"debug",5)) {
236 ads
->iflags
|= adns_if_debug
;
239 if (l
>=6 && !memcmp(word
,"ndots:",6)) {
240 v
= strtoul(word
+6,&ep
,10);
241 if (l
==6 || ep
!= word
+l
|| v
> INT_MAX
) {
242 configparseerr(ads
,fn
,lno
,"option `%.*s' malformed"
243 " or has bad value",l
,word
);
249 if (l
>=12 && !memcmp(word
,"adns_checkc:",12)) {
250 if (!strcmp(word
+12,"none")) {
251 ads
->iflags
&= ~adns_if_checkc_freq
;
252 ads
->iflags
|= adns_if_checkc_entex
;
253 } else if (!strcmp(word
+12,"entex")) {
254 ads
->iflags
&= ~adns_if_checkc_freq
;
255 ads
->iflags
|= adns_if_checkc_entex
;
256 } else if (!strcmp(word
+12,"freq")) {
257 ads
->iflags
|= adns_if_checkc_freq
;
259 configparseerr(ads
,fn
,lno
, "option adns_checkc has bad value `%s' "
260 "(must be none, entex or freq", word
+12);
264 adns__diag(ads
,-1,0,"%s:%d: unknown option `%.*s'", fn
,lno
, l
,word
);
268 static void ccf_clearnss(adns_state ads
, const char *fn
,
269 int lno
, const char *buf
) {
273 static void ccf_include(adns_state ads
, const char *fn
,
274 int lno
, const char *buf
) {
276 configparseerr(ads
,fn
,lno
,"`include' directive with no filename");
279 readconfig(ads
,buf
,1);
282 static void ccf_lookup(adns_state ads
, const char *fn
, int lno
,
289 configparseerr(ads
,fn
,lno
,"`lookup' directive with no databases");
293 while (nextword(&buf
,&word
,&l
)) {
294 if (l
==4 && !memcmp(word
,"bind",4)) {
296 } else if (l
==4 && !memcmp(word
,"file",4)) {
297 /* ignore this and hope /etc/hosts is not essential */
298 } else if (l
==2 && !memcmp(word
,"yp",2)) {
299 adns__diag(ads
,-1,0,"%s:%d: yp lookups not supported by adns", fn
,lno
);
302 adns__diag(ads
,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
308 adns__diag(ads
,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn
,lno
);
311 static const struct configcommandinfo
{
313 void (*fn
)(adns_state ads
, const char *fn
, int lno
, const char *buf
);
314 } configcommandinfos
[]= {
315 { "nameserver", ccf_nameserver
},
316 { "domain", ccf_search
},
317 { "search", ccf_search
},
318 { "sortlist", ccf_sortlist
},
319 { "options", ccf_options
},
320 { "clearnameservers", ccf_clearnss
},
321 { "include", ccf_include
},
322 { "lookup", ccf_lookup
}, /* OpenBSD */
331 static int gl_file(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
332 int lno
, char *buf
, int buflen
) {
333 FILE *file
= src_io
->file
;
341 for (;;) { /* loop over chars */
343 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
348 adns__diag(ads
,-1,0,"%s:%d: line contains nul, ignored",filename
,lno
);
350 } else if (c
== '\n') {
352 } else if (c
== EOF
) {
355 adns__diag(ads
,-1,0,"%s:%d: read error: %s",
356 filename
,lno
,strerror(errno
));
372 while ((c
= getc(file
)) != EOF
&& c
!= '\n');
376 static int gl_text(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
377 int lno
, char *buf
, int buflen
) {
378 const char *cp
= src_io
->text
;
381 if (!cp
|| !*cp
) return -1;
383 if (*cp
== ';' || *cp
== '\n') cp
++;
384 l
= strcspn(cp
,";\n");
388 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
398 static void readconfiggeneric(adns_state ads
, const char *filename
,
399 int (*getline
)(adns_state ads
, getline_ctx
*,
400 const char *filename
, int lno
,
401 char *buf
, int buflen
),
402 /* Returns >=0 for success, -1 for EOF or error
403 * (error will have been reported), or -2 for
404 * bad line was encountered, try again.
406 getline_ctx gl_ctx
) {
407 char linebuf
[2000], *p
, *q
;
409 const struct configcommandinfo
*ccip
;
412 (l
= getline(ads
,&gl_ctx
, filename
,lno
, linebuf
,sizeof(linebuf
))) != -1;
414 if (l
== -2) continue;
415 while (l
>0 && ctype_whitespace(linebuf
[l
-1])) l
--;
418 while (ctype_whitespace(*p
)) p
++;
419 if (*p
== '#' || *p
== ';' || !*p
) continue;
421 while (*q
&& !ctype_whitespace(*q
)) q
++;
423 for (ccip
=configcommandinfos
;
425 !(strlen(ccip
->name
)==dirl
&& !memcmp(ccip
->name
,p
,q
-p
));
428 adns__diag(ads
,-1,0,"%s:%d: unknown configuration directive `%.*s'",
429 filename
,lno
,(int)(q
-p
),p
);
432 while (ctype_whitespace(*q
)) q
++;
433 ccip
->fn(ads
,filename
,lno
,q
);
437 static const char *instrum_getenv(adns_state ads
, const char *envvar
) {
440 value
= getenv(envvar
);
441 if (!value
) adns__debug(ads
,-1,0,"environment variable %s not set",envvar
);
442 else adns__debug(ads
,-1,0,"environment variable %s"
443 " set to `%s'",envvar
,value
);
447 static void readconfig(adns_state ads
, const char *filename
, int warnmissing
) {
450 gl_ctx
.file
= fopen(filename
,"r");
452 if (errno
== ENOENT
) {
454 adns__debug(ads
,-1,0, "configuration file"
455 " `%s' does not exist",filename
);
459 adns__diag(ads
,-1,0,"cannot open configuration file `%s': %s",
460 filename
,strerror(errno
));
464 readconfiggeneric(ads
,filename
,gl_file
,gl_ctx
);
469 static void readconfigtext(adns_state ads
, const char *text
,
470 const char *showname
) {
474 readconfiggeneric(ads
,showname
,gl_text
,gl_ctx
);
477 static void readconfigenv(adns_state ads
, const char *envvar
) {
478 const char *filename
;
480 if (ads
->iflags
& adns_if_noenv
) {
481 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
484 filename
= instrum_getenv(ads
,envvar
);
485 if (filename
) readconfig(ads
,filename
,1);
488 static void readconfigenvtext(adns_state ads
, const char *envvar
) {
489 const char *textdata
;
491 if (ads
->iflags
& adns_if_noenv
) {
492 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
495 textdata
= instrum_getenv(ads
,envvar
);
496 if (textdata
) readconfigtext(ads
,textdata
,envvar
);
500 int adns__setnonblock(adns_state ads
, int fd
) {
503 r
= fcntl(fd
,F_GETFL
,0); if (r
<0) return errno
;
505 r
= fcntl(fd
,F_SETFL
,r
); if (r
<0) return errno
;
509 static int init_begin(adns_state
*ads_r
, adns_initflags flags
,
510 adns_logcallbackfn
*logfn
, void *logfndata
) {
514 ads
= malloc(sizeof(*ads
)); if (!ads
) return errno
;
518 ads
->logfndata
= logfndata
;
520 LIST_INIT(ads
->udpw
);
521 LIST_INIT(ads
->tcpw
);
522 LIST_INIT(ads
->childw
);
523 LIST_INIT(ads
->output
);
526 ads
->udpsocket
= ads
->tcpsocket
= -1;
527 adns__vbuf_init(&ads
->tcpsend
);
528 adns__vbuf_init(&ads
->tcprecv
);
529 ads
->tcprecv_skip
= 0;
530 ads
->nservers
= ads
->nsortlist
= ads
->nsearchlist
= ads
->tcpserver
= 0;
532 ads
->tcpstate
= server_disconnected
;
533 timerclear(&ads
->tcptimeout
);
537 ads
->rand48xsubi
[0]= pid
;
538 ads
->rand48xsubi
[1]= (unsigned long)pid
>> 16;
539 ads
->rand48xsubi
[2]= pid
^ ((unsigned long)pid
>> 16);
545 static int init_finish(adns_state ads
) {
547 struct protoent
*proto
;
550 if (!ads
->nservers
) {
551 if (ads
->logfn
&& ads
->iflags
& adns_if_debug
)
552 adns__lprintf(ads
,"adns: no nameservers, using localhost\n");
553 ia
.s_addr
= htonl(INADDR_LOOPBACK
);
557 proto
= getprotobyname("udp"); if (!proto
) { r
= ENOPROTOOPT
; goto x_free
; }
558 ads
->udpsocket
= socket(AF_INET
,SOCK_DGRAM
,proto
->p_proto
);
559 if (ads
->udpsocket
<0) { r
= errno
; goto x_free
; }
561 r
= adns__setnonblock(ads
,ads
->udpsocket
);
562 if (r
) { r
= errno
; goto x_closeudp
; }
567 close(ads
->udpsocket
);
573 static void init_abort(adns_state ads
) {
574 if (ads
->nsearchlist
) {
575 free(ads
->searchlist
[0]);
576 free(ads
->searchlist
);
581 static void logfn_file(adns_state ads
, void *logfndata
,
582 const char *fmt
, va_list al
) {
583 vfprintf(logfndata
,fmt
,al
);
586 static int init_files(adns_state
*ads_r
, adns_initflags flags
,
587 adns_logcallbackfn
*logfn
, void *logfndata
) {
589 const char *res_options
, *adns_res_options
;
592 r
= init_begin(&ads
, flags
, logfn
, logfndata
);
595 res_options
= instrum_getenv(ads
,"RES_OPTIONS");
596 adns_res_options
= instrum_getenv(ads
,"ADNS_RES_OPTIONS");
597 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
598 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
600 readconfig(ads
,"/etc/resolv.conf",1);
601 readconfig(ads
,"/etc/resolv-adns.conf",0);
602 readconfigenv(ads
,"RES_CONF");
603 readconfigenv(ads
,"ADNS_RES_CONF");
605 readconfigenvtext(ads
,"RES_CONF_TEXT");
606 readconfigenvtext(ads
,"ADNS_RES_CONF_TEXT");
608 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
609 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
611 ccf_search(ads
,"LOCALDOMAIN",-1,instrum_getenv(ads
,"LOCALDOMAIN"));
612 ccf_search(ads
,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads
,"ADNS_LOCALDOMAIN"));
614 if (ads
->configerrno
&& ads
->configerrno
!= EINVAL
) {
623 adns__consistency(ads
,0,cc_entex
);
628 int adns_init(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
629 return init_files(ads_r
, flags
, logfn_file
, diagfile ? diagfile
: stderr
);
632 static int init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
633 adns_logcallbackfn
*logfn
, void *logfndata
,
634 const char *configtext
) {
638 r
= init_begin(&ads
, flags
, logfn
, logfndata
);
641 readconfigtext(ads
,configtext
,"<supplied configuration text>");
642 if (ads
->configerrno
) {
648 r
= init_finish(ads
); if (r
) return r
;
649 adns__consistency(ads
,0,cc_entex
);
654 int adns_init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
655 FILE *diagfile
, const char *configtext
) {
656 return init_strcfg(ads_r
, flags
,
657 diagfile ? logfn_file
: 0, diagfile
,
661 int adns_init_logfn(adns_state
*newstate_r
, adns_initflags flags
,
662 const char *configtext
/*0=>use default config files*/,
663 adns_logcallbackfn
*logfn
/*0=>logfndata is a FILE* */,
664 void *logfndata
/*0 with logfn==0 => discard*/) {
665 if (!logfn
&& logfndata
)
668 return init_strcfg(newstate_r
, flags
, logfn
, logfndata
, configtext
);
670 return init_files(newstate_r
, flags
, logfn
, logfndata
);
673 void adns_finish(adns_state ads
) {
674 adns__consistency(ads
,0,cc_entex
);
676 if (ads
->udpw
.head
) adns_cancel(ads
->udpw
.head
);
677 else if (ads
->tcpw
.head
) adns_cancel(ads
->tcpw
.head
);
678 else if (ads
->childw
.head
) adns_cancel(ads
->childw
.head
);
679 else if (ads
->output
.head
) adns_cancel(ads
->output
.head
);
682 close(ads
->udpsocket
);
683 if (ads
->tcpsocket
>= 0) close(ads
->tcpsocket
);
684 adns__vbuf_free(&ads
->tcpsend
);
685 adns__vbuf_free(&ads
->tcprecv
);
690 void adns_forallqueries_begin(adns_state ads
) {
691 adns__consistency(ads
,0,cc_entex
);
693 ads
->udpw
.head ? ads
->udpw
.head
:
694 ads
->tcpw
.head ? ads
->tcpw
.head
:
695 ads
->childw
.head ? ads
->childw
.head
:
699 adns_query
adns_forallqueries_next(adns_state ads
, void **context_r
) {
702 adns__consistency(ads
,0,cc_entex
);
703 nqu
= ads
->forallnext
;
709 } else if (qu
== ads
->udpw
.tail
) {
711 ads
->tcpw
.head ? ads
->tcpw
.head
:
712 ads
->childw
.head ? ads
->childw
.head
:
714 } else if (qu
== ads
->tcpw
.tail
) {
716 ads
->childw
.head ? ads
->childw
.head
:
718 } else if (qu
== ads
->childw
.tail
) {
719 nqu
= ads
->output
.head
;
723 if (!qu
->parent
) break;
725 ads
->forallnext
= nqu
;
726 if (context_r
) *context_r
= qu
->ctx
.ext
;