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 sockaddr
*sa
, int n
) {
47 char buf
[MAX_ADDRSTRLEN
];
49 if (!adns__af_supported_p(sa
->sa_family
)) {
51 "nameserver %s for unknown address family %d ignored",
52 adns__sockaddr_ntoa(sa
, n
, buf
), sa
->sa_family
);
55 for (i
=0; i
<ads
->nservers
; i
++) {
56 if (adns__sockaddr_equal_p(sa
, &ads
->servers
[i
].addr
.sa
)) {
57 adns__debug(ads
,-1,0,"duplicate nameserver %s ignored",
58 adns__sockaddr_ntoa(sa
, n
, buf
));
63 if (ads
->nservers
>=MAXSERVERS
) {
64 adns__diag(ads
,-1,0,"too many nameservers, ignoring %s",
65 adns__sockaddr_ntoa(sa
, n
, buf
));
69 ss
= ads
->servers
+ads
->nservers
;
70 assert(n
<= sizeof(ss
->addr
));
72 memcpy(&ss
->addr
, sa
, n
);
76 static void freesearchlist(adns_state ads
) {
77 if (ads
->nsearchlist
) free(*ads
->searchlist
);
78 free(ads
->searchlist
);
81 static void saveerr(adns_state ads
, int en
) {
82 if (!ads
->configerrno
) ads
->configerrno
= en
;
85 static void configparseerr(adns_state ads
, const char *fn
, int lno
,
86 const char *fmt
, ...) {
90 if (!ads
->logfn
|| (ads
->iflags
& adns_if_noerrprint
)) return;
92 if (lno
==-1) adns__lprintf(ads
,"adns: %s: ",fn
);
93 else adns__lprintf(ads
,"adns: %s:%d: ",fn
,lno
);
95 adns__vlprintf(ads
,fmt
,al
);
97 adns__lprintf(ads
,"\n");
100 static int nextword(const char **bufp_io
, const char **word_r
, int *l_r
) {
104 while (ctype_whitespace(*p
)) p
++;
108 while (*q
&& !ctype_whitespace(*q
)) q
++;
117 static void ccf_nameserver(adns_state ads
, const char *fn
,
118 int lno
, const char *buf
) {
119 struct addrinfo
*ai
, ai_hint
= { 0 };
120 char addrbuf
[MAX_ADDRSTRLEN
];
123 ai_hint
.ai_family
= AF_UNSPEC
;
124 ai_hint
.ai_socktype
= SOCK_DGRAM
;
125 ai_hint
.ai_flags
= AI_NUMERICHOST
| AI_NUMERICSERV
;
127 err
= getaddrinfo(buf
, STRINGIFY(DNS_PORT
), &ai_hint
, &ai
);
129 configparseerr(ads
,fn
,lno
,"invalid nameserver address `%s' (%s)",
130 buf
, gai_strerror(err
));
134 adns__debug(ads
,-1,0,"using nameserver %s",
135 adns__sockaddr_ntoa(ai
->ai_addr
, ai
->ai_addrlen
, addrbuf
));
136 addserver(ads
, ai
->ai_addr
, ai
->ai_addrlen
);
140 static void ccf_search(adns_state ads
, const char *fn
,
141 int lno
, const char *buf
) {
142 const char *bufp
, *word
;
143 char *newchars
, **newptrs
, **pp
;
151 while (nextword(&bufp
,&word
,&l
)) { count
++; tl
+= l
+1; }
153 newptrs
= malloc(sizeof(char*)*count
);
154 if (!newptrs
) { saveerr(ads
,errno
); return; }
156 newchars
= malloc(tl
);
157 if (!newchars
) { saveerr(ads
,errno
); free(newptrs
); return; }
161 while (nextword(&bufp
,&word
,&l
)) {
163 memcpy(newchars
,word
,l
);
169 ads
->nsearchlist
= count
;
170 ads
->searchlist
= newptrs
;
173 static void ccf_sortlist(adns_state ads
, const char *fn
,
174 int lno
, const char *buf
) {
176 char tbuf
[200], *slash
, *ep
;
177 const char *maskwhat
;
186 while (nextword(&buf
,&word
,&l
)) {
187 if (ads
->nsortlist
>= MAXSORTLIST
) {
188 adns__diag(ads
,-1,0,"too many sortlist entries,"
189 " ignoring %.*s onwards",l
,word
);
193 if (l
>= sizeof(tbuf
)) {
194 configparseerr(ads
,fn
,lno
,"sortlist entry `%.*s' too long",l
,word
);
198 memcpy(tbuf
,word
,l
); tbuf
[l
]= 0;
199 slash
= strchr(tbuf
,'/');
200 if (slash
) *slash
++= 0;
202 sl
= &ads
->sortlist
[ads
->nsortlist
];
204 if (!adns__gen_pton(tbuf
, &af
, &sl
->base
)) {
205 configparseerr(ads
,fn
,lno
,"invalid address `%s' in sortlist",tbuf
);
210 if (slash
[strspn(slash
, "0123456789")]) {
212 if (!inet_pton(af
,slash
,&sl
->mask
)) {
213 configparseerr(ads
,fn
,lno
,"invalid mask `%s' in sortlist",slash
);
217 maskwhat
= "prefix length";
218 initial
= strtoul(slash
,&ep
,10);
219 if (*ep
|| initial
>adns__addr_width(af
)) {
220 configparseerr(ads
,fn
,lno
,"mask length `%s' invalid",slash
);
223 adns__prefix_mask(af
, initial
, &sl
->mask
);
226 maskwhat
= "implied prefix length";
227 initial
= adns__guess_prefix_length(af
, &sl
->base
);
229 configparseerr(ads
,fn
,lno
, "network address `%s'"
230 " in sortlist is not in classed ranges,"
231 " must specify mask explicitly", tbuf
);
234 adns__prefix_mask(af
, initial
, &sl
->mask
);
237 if (!adns__addr_match_p(af
,&sl
->base
, af
,&sl
->base
,&sl
->mask
)) {
239 configparseerr(ads
,fn
,lno
, "%s %d in sortlist"
240 " overlaps address `%s'",maskwhat
,initial
,tbuf
);
242 configparseerr(ads
,fn
,lno
, "%s `%s' in sortlist"
243 " overlaps address `%s'",maskwhat
,slash
,tbuf
);
253 static void ccf_options(adns_state ads
, const char *fn
,
254 int lno
, const char *buf
) {
262 while (nextword(&buf
,&word
,&l
)) {
263 if (l
==5 && !memcmp(word
,"debug",5)) {
264 ads
->iflags
|= adns_if_debug
;
267 if (l
>=6 && !memcmp(word
,"ndots:",6)) {
268 v
= strtoul(word
+6,&ep
,10);
269 if (l
==6 || ep
!= word
+l
|| v
> INT_MAX
) {
270 configparseerr(ads
,fn
,lno
,"option `%.*s' malformed"
271 " or has bad value",l
,word
);
277 if (l
>=12 && !memcmp(word
,"adns_checkc:",12)) {
278 if (!strcmp(word
+12,"none")) {
279 ads
->iflags
&= ~adns_if_checkc_freq
;
280 ads
->iflags
|= adns_if_checkc_entex
;
281 } else if (!strcmp(word
+12,"entex")) {
282 ads
->iflags
&= ~adns_if_checkc_freq
;
283 ads
->iflags
|= adns_if_checkc_entex
;
284 } else if (!strcmp(word
+12,"freq")) {
285 ads
->iflags
|= adns_if_checkc_freq
;
287 configparseerr(ads
,fn
,lno
, "option adns_checkc has bad value `%s' "
288 "(must be none, entex or freq", word
+12);
292 if (l
>=8 && !memcmp(word
,"adns_af:",8)) {
293 if (!strcmp(word
+8,"v4only"))
294 ads
->iflags
= (ads
->iflags
& ~adns_if_afmask
) | adns_if_af_v4only
;
295 else if (!strcmp(word
+8,"v6only"))
296 ads
->iflags
= (ads
->iflags
& ~adns_if_afmask
) | adns_if_af_v6only
;
297 else if (!strcmp(word
+8,"any"))
298 ads
->iflags
= (ads
->iflags
& ~adns_if_afmask
);
300 configparseerr(ads
,fn
,lno
, "option adns_af has bad value `%s' "
301 "(must be any, v4only or v6only", word
+8);
305 adns__diag(ads
,-1,0,"%s:%d: unknown option `%.*s'", fn
,lno
, l
,word
);
309 static void ccf_clearnss(adns_state ads
, const char *fn
,
310 int lno
, const char *buf
) {
314 static void ccf_include(adns_state ads
, const char *fn
,
315 int lno
, const char *buf
) {
317 configparseerr(ads
,fn
,lno
,"`include' directive with no filename");
320 readconfig(ads
,buf
,1);
323 static void ccf_lookup(adns_state ads
, const char *fn
, int lno
,
330 configparseerr(ads
,fn
,lno
,"`lookup' directive with no databases");
334 while (nextword(&buf
,&word
,&l
)) {
335 if (l
==4 && !memcmp(word
,"bind",4)) {
337 } else if (l
==4 && !memcmp(word
,"file",4)) {
338 /* ignore this and hope /etc/hosts is not essential */
339 } else if (l
==2 && !memcmp(word
,"yp",2)) {
340 adns__diag(ads
,-1,0,"%s:%d: yp lookups not supported by adns", fn
,lno
);
343 adns__diag(ads
,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
349 adns__diag(ads
,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn
,lno
);
352 static const struct configcommandinfo
{
354 void (*fn
)(adns_state ads
, const char *fn
, int lno
, const char *buf
);
355 } configcommandinfos
[]= {
356 { "nameserver", ccf_nameserver
},
357 { "domain", ccf_search
},
358 { "search", ccf_search
},
359 { "sortlist", ccf_sortlist
},
360 { "options", ccf_options
},
361 { "clearnameservers", ccf_clearnss
},
362 { "include", ccf_include
},
363 { "lookup", ccf_lookup
}, /* OpenBSD */
372 static int gl_file(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
373 int lno
, char *buf
, int buflen
) {
374 FILE *file
= src_io
->file
;
382 for (;;) { /* loop over chars */
384 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
389 adns__diag(ads
,-1,0,"%s:%d: line contains nul, ignored",filename
,lno
);
391 } else if (c
== '\n') {
393 } else if (c
== EOF
) {
396 adns__diag(ads
,-1,0,"%s:%d: read error: %s",
397 filename
,lno
,strerror(errno
));
413 while ((c
= getc(file
)) != EOF
&& c
!= '\n');
417 static int gl_text(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
418 int lno
, char *buf
, int buflen
) {
419 const char *cp
= src_io
->text
;
422 if (!cp
|| !*cp
) return -1;
424 if (*cp
== ';' || *cp
== '\n') cp
++;
425 l
= strcspn(cp
,";\n");
429 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
439 static void readconfiggeneric(adns_state ads
, const char *filename
,
440 int (*getline
)(adns_state ads
, getline_ctx
*,
441 const char *filename
, int lno
,
442 char *buf
, int buflen
),
443 /* Returns >=0 for success, -1 for EOF or error
444 * (error will have been reported), or -2 for
445 * bad line was encountered, try again.
447 getline_ctx gl_ctx
) {
448 char linebuf
[2000], *p
, *q
;
450 const struct configcommandinfo
*ccip
;
453 (l
= getline(ads
,&gl_ctx
, filename
,lno
, linebuf
,sizeof(linebuf
))) != -1;
455 if (l
== -2) continue;
456 while (l
>0 && ctype_whitespace(linebuf
[l
-1])) l
--;
459 while (ctype_whitespace(*p
)) p
++;
460 if (*p
== '#' || *p
== ';' || !*p
) continue;
462 while (*q
&& !ctype_whitespace(*q
)) q
++;
464 for (ccip
=configcommandinfos
;
466 !(strlen(ccip
->name
)==dirl
&& !memcmp(ccip
->name
,p
,q
-p
));
469 adns__diag(ads
,-1,0,"%s:%d: unknown configuration directive `%.*s'",
470 filename
,lno
,(int)(q
-p
),p
);
473 while (ctype_whitespace(*q
)) q
++;
474 ccip
->fn(ads
,filename
,lno
,q
);
478 static const char *instrum_getenv(adns_state ads
, const char *envvar
) {
481 value
= getenv(envvar
);
482 if (!value
) adns__debug(ads
,-1,0,"environment variable %s not set",envvar
);
483 else adns__debug(ads
,-1,0,"environment variable %s"
484 " set to `%s'",envvar
,value
);
488 static void readconfig(adns_state ads
, const char *filename
, int warnmissing
) {
491 gl_ctx
.file
= fopen(filename
,"r");
493 if (errno
== ENOENT
) {
495 adns__debug(ads
,-1,0, "configuration file"
496 " `%s' does not exist",filename
);
500 adns__diag(ads
,-1,0,"cannot open configuration file `%s': %s",
501 filename
,strerror(errno
));
505 readconfiggeneric(ads
,filename
,gl_file
,gl_ctx
);
510 static void readconfigtext(adns_state ads
, const char *text
,
511 const char *showname
) {
515 readconfiggeneric(ads
,showname
,gl_text
,gl_ctx
);
518 static void readconfigenv(adns_state ads
, const char *envvar
) {
519 const char *filename
;
521 if (ads
->iflags
& adns_if_noenv
) {
522 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
525 filename
= instrum_getenv(ads
,envvar
);
526 if (filename
) readconfig(ads
,filename
,1);
529 static void readconfigenvtext(adns_state ads
, const char *envvar
) {
530 const char *textdata
;
532 if (ads
->iflags
& adns_if_noenv
) {
533 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
536 textdata
= instrum_getenv(ads
,envvar
);
537 if (textdata
) readconfigtext(ads
,textdata
,envvar
);
541 int adns__setnonblock(adns_state ads
, int fd
) {
544 r
= fcntl(fd
,F_GETFL
,0); if (r
<0) return errno
;
546 r
= fcntl(fd
,F_SETFL
,r
); if (r
<0) return errno
;
550 static int init_begin(adns_state
*ads_r
, adns_initflags flags
,
551 adns_logcallbackfn
*logfn
, void *logfndata
) {
555 ads
= malloc(sizeof(*ads
)); if (!ads
) return errno
;
559 ads
->logfndata
= logfndata
;
561 LIST_INIT(ads
->udpw
);
562 LIST_INIT(ads
->tcpw
);
563 LIST_INIT(ads
->childw
);
564 LIST_INIT(ads
->output
);
569 adns__vbuf_init(&ads
->tcpsend
);
570 adns__vbuf_init(&ads
->tcprecv
);
571 ads
->tcprecv_skip
= 0;
572 ads
->nservers
= ads
->nsortlist
= ads
->nsearchlist
= ads
->tcpserver
= 0;
574 ads
->tcpstate
= server_disconnected
;
575 timerclear(&ads
->tcptimeout
);
579 ads
->rand48xsubi
[0]= pid
;
580 ads
->rand48xsubi
[1]= (unsigned long)pid
>> 16;
581 ads
->rand48xsubi
[2]= pid
^ ((unsigned long)pid
>> 16);
587 static int init_finish(adns_state ads
) {
588 struct sockaddr_in sin
;
589 struct protoent
*proto
;
590 struct udpsocket
*udp
;
594 if (!ads
->nservers
) {
595 if (ads
->logfn
&& ads
->iflags
& adns_if_debug
)
596 adns__lprintf(ads
,"adns: no nameservers, using IPv4 localhost\n");
597 memset(&sin
, 0, sizeof(sin
));
598 sin
.sin_family
= AF_INET
;
599 sin
.sin_port
= htons(DNS_PORT
);
600 sin
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
601 addserver(ads
,(struct sockaddr
*)&sin
, sizeof(sin
));
604 proto
= getprotobyname("udp"); if (!proto
) { r
= ENOPROTOOPT
; goto x_free
; }
606 for (i
= 0; i
< ads
->nservers
; i
++) {
607 if (adns__udpsocket_by_af(ads
, ads
->servers
[i
].addr
.sa
.sa_family
))
609 assert(ads
->nudp
< MAXUDP
);
610 udp
= &ads
->udpsocket
[ads
->nudp
];
611 udp
->af
= ads
->servers
[i
].addr
.sa
.sa_family
;
612 udp
->fd
= socket(udp
->af
,SOCK_DGRAM
,proto
->p_proto
);
613 if (udp
->fd
< 0) { r
= errno
; goto x_free
; }
614 r
= adns__setnonblock(ads
,udp
->fd
);
615 if (r
) { r
= errno
; goto x_closeudp
; }
622 for (j
= 0; j
< ads
->nudp
; j
++) close(ads
->udpsocket
[j
].fd
);
628 static void init_abort(adns_state ads
) {
629 if (ads
->nsearchlist
) {
630 free(ads
->searchlist
[0]);
631 free(ads
->searchlist
);
636 static void logfn_file(adns_state ads
, void *logfndata
,
637 const char *fmt
, va_list al
) {
638 vfprintf(logfndata
,fmt
,al
);
641 static int init_files(adns_state
*ads_r
, adns_initflags flags
,
642 adns_logcallbackfn
*logfn
, void *logfndata
) {
644 const char *res_options
, *adns_res_options
;
647 r
= init_begin(&ads
, flags
, logfn
, logfndata
);
650 res_options
= instrum_getenv(ads
,"RES_OPTIONS");
651 adns_res_options
= instrum_getenv(ads
,"ADNS_RES_OPTIONS");
652 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
653 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
655 readconfig(ads
,"/etc/resolv.conf",1);
656 readconfig(ads
,"/etc/resolv-adns.conf",0);
657 readconfigenv(ads
,"RES_CONF");
658 readconfigenv(ads
,"ADNS_RES_CONF");
660 readconfigenvtext(ads
,"RES_CONF_TEXT");
661 readconfigenvtext(ads
,"ADNS_RES_CONF_TEXT");
663 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
664 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
666 ccf_search(ads
,"LOCALDOMAIN",-1,instrum_getenv(ads
,"LOCALDOMAIN"));
667 ccf_search(ads
,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads
,"ADNS_LOCALDOMAIN"));
669 if (ads
->configerrno
&& ads
->configerrno
!= EINVAL
) {
678 adns__consistency(ads
,0,cc_entex
);
683 int adns_init(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
684 return init_files(ads_r
, flags
, logfn_file
, diagfile ? diagfile
: stderr
);
687 static int init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
688 adns_logcallbackfn
*logfn
, void *logfndata
,
689 const char *configtext
) {
693 r
= init_begin(&ads
, flags
, logfn
, logfndata
);
696 readconfigtext(ads
,configtext
,"<supplied configuration text>");
697 if (ads
->configerrno
) {
703 r
= init_finish(ads
); if (r
) return r
;
704 adns__consistency(ads
,0,cc_entex
);
709 int adns_init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
710 FILE *diagfile
, const char *configtext
) {
711 return init_strcfg(ads_r
, flags
,
712 diagfile ? logfn_file
: 0, diagfile
,
716 int adns_init_logfn(adns_state
*newstate_r
, adns_initflags flags
,
717 const char *configtext
/*0=>use default config files*/,
718 adns_logcallbackfn
*logfn
/*0=>logfndata is a FILE* */,
719 void *logfndata
/*0 with logfn==0 => discard*/) {
720 if (!logfn
&& logfndata
)
723 return init_strcfg(newstate_r
, flags
, logfn
, logfndata
, configtext
);
725 return init_files(newstate_r
, flags
, logfn
, logfndata
);
728 void adns_finish(adns_state ads
) {
730 adns__consistency(ads
,0,cc_entex
);
732 if (ads
->udpw
.head
) adns_cancel(ads
->udpw
.head
);
733 else if (ads
->tcpw
.head
) adns_cancel(ads
->tcpw
.head
);
734 else if (ads
->childw
.head
) adns_cancel(ads
->childw
.head
);
735 else if (ads
->output
.head
) adns_cancel(ads
->output
.head
);
738 for (i
= 0; i
< ads
->nudp
; i
++) close(ads
->udpsocket
[i
].fd
);
739 if (ads
->tcpsocket
>= 0) close(ads
->tcpsocket
);
740 adns__vbuf_free(&ads
->tcpsend
);
741 adns__vbuf_free(&ads
->tcprecv
);
746 void adns_forallqueries_begin(adns_state ads
) {
747 adns__consistency(ads
,0,cc_entex
);
749 ads
->udpw
.head ? ads
->udpw
.head
:
750 ads
->tcpw
.head ? ads
->tcpw
.head
:
751 ads
->childw
.head ? ads
->childw
.head
:
755 adns_query
adns_forallqueries_next(adns_state ads
, void **context_r
) {
758 adns__consistency(ads
,0,cc_entex
);
759 nqu
= ads
->forallnext
;
765 } else if (qu
== ads
->udpw
.tail
) {
767 ads
->tcpw
.head ? ads
->tcpw
.head
:
768 ads
->childw
.head ? ads
->childw
.head
:
770 } else if (qu
== ads
->tcpw
.tail
) {
772 ads
->childw
.head ? ads
->childw
.head
:
774 } else if (qu
== ads
->childw
.tail
) {
775 nqu
= ads
->output
.head
;
779 if (!qu
->parent
) break;
781 ads
->forallnext
= nqu
;
782 if (context_r
) *context_r
= qu
->ctx
.ext
;