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 const afinfo
*const transport_aftab
[] = {
50 static const afinfo
*find_afinfo(int af
)
54 for (i
= 0; transport_aftab
[i
]; i
++)
55 if (transport_aftab
[i
]->af
== af
) return transport_aftab
[i
];
59 static void addserver(adns_state ads
, struct sockaddr
*sa
, int n
) {
64 ai
= find_afinfo(sa
->sa_family
);
67 "nameserver %s for unknown address family %d ignored",
68 adns__sockaddr_ntoa(sa
, n
), sa
->sa_family
);
71 for (i
=0; i
<ads
->nservers
; i
++) {
72 if (ads
->servers
[i
].addr
.sa
.sa_family
== sa
->sa_family
&&
73 ai
->sockaddr_equalp(sa
, &ads
->servers
[i
].addr
.sa
)) {
74 adns__debug(ads
,-1,0,"duplicate nameserver %s ignored",
75 adns__sockaddr_ntoa(sa
, n
));
80 if (ads
->nservers
>=MAXSERVERS
) {
81 adns__diag(ads
,-1,0,"too many nameservers, ignoring %s",
82 adns__sockaddr_ntoa(sa
, n
));
86 ss
= ads
->servers
+ads
->nservers
;
87 assert(n
<= sizeof(ss
->addr
));
89 memcpy(&ss
->addr
, sa
, n
);
93 static void freesearchlist(adns_state ads
) {
94 if (ads
->nsearchlist
) free(*ads
->searchlist
);
95 free(ads
->searchlist
);
98 static void saveerr(adns_state ads
, int en
) {
99 if (!ads
->configerrno
) ads
->configerrno
= en
;
102 static void configparseerr(adns_state ads
, const char *fn
, int lno
,
103 const char *fmt
, ...) {
107 if (!ads
->logfn
|| (ads
->iflags
& adns_if_noerrprint
)) return;
109 if (lno
==-1) adns__lprintf(ads
,"adns: %s: ",fn
);
110 else adns__lprintf(ads
,"adns: %s:%d: ",fn
,lno
);
112 adns__vlprintf(ads
,fmt
,al
);
114 adns__lprintf(ads
,"\n");
117 static int nextword(const char **bufp_io
, const char **word_r
, int *l_r
) {
121 while (ctype_whitespace(*p
)) p
++;
125 while (*q
&& !ctype_whitespace(*q
)) q
++;
134 static void ccf_nameserver(adns_state ads
, const char *fn
,
135 int lno
, const char *buf
) {
136 struct addrinfo
*ai
, ai_hint
= { 0 };
139 ai_hint
.ai_family
= AF_UNSPEC
;
140 ai_hint
.ai_socktype
= SOCK_DGRAM
;
141 ai_hint
.ai_flags
= AI_NUMERICHOST
| AI_NUMERICSERV
;
143 err
= getaddrinfo(buf
, STRINGIFY(DNS_PORT
), &ai_hint
, &ai
);
145 configparseerr(ads
,fn
,lno
,"invalid nameserver address `%s' (%s)",
146 buf
, gai_strerror(err
));
150 adns__debug(ads
,-1,0,"using nameserver %s",
151 adns__sockaddr_ntoa(ai
->ai_addr
, ai
->ai_addrlen
));
152 addserver(ads
, ai
->ai_addr
, ai
->ai_addrlen
);
156 static void ccf_search(adns_state ads
, const char *fn
,
157 int lno
, const char *buf
) {
158 const char *bufp
, *word
;
159 char *newchars
, **newptrs
, **pp
;
167 while (nextword(&bufp
,&word
,&l
)) { count
++; tl
+= l
+1; }
169 newptrs
= malloc(sizeof(char*)*count
);
170 if (!newptrs
) { saveerr(ads
,errno
); return; }
172 newchars
= malloc(tl
);
173 if (!newchars
) { saveerr(ads
,errno
); free(newptrs
); return; }
177 while (nextword(&bufp
,&word
,&l
)) {
179 memcpy(newchars
,word
,l
);
185 ads
->nsearchlist
= count
;
186 ads
->searchlist
= newptrs
;
189 static void ccf_sortlist(adns_state ads
, const char *fn
,
190 int lno
, const char *buf
) {
192 char tbuf
[200], *slash
, *ep
;
193 const char *maskwhat
;
202 while (nextword(&buf
,&word
,&l
)) {
203 if (ads
->nsortlist
>= MAXSORTLIST
) {
204 adns__diag(ads
,-1,0,"too many sortlist entries,"
205 " ignoring %.*s onwards",l
,word
);
209 if (l
>= sizeof(tbuf
)) {
210 configparseerr(ads
,fn
,lno
,"sortlist entry `%.*s' too long",l
,word
);
214 memcpy(tbuf
,word
,l
); tbuf
[l
]= 0;
215 slash
= strchr(tbuf
,'/');
216 if (slash
) *slash
++= 0;
218 sl
= &ads
->sortlist
[ads
->nsortlist
];
220 if (strchr(tbuf
, ':'))
221 ai
= &adns__inet6_afinfo
;
223 ai
= &adns__inet_afinfo
;
225 if (!inet_pton(ai
->af
, tbuf
, &sl
->base
)) {
226 configparseerr(ads
,fn
,lno
,"invalid address `%s' in sortlist",tbuf
);
231 if (strchr(slash
,ai
->delim
)) {
233 if (!inet_pton(ai
->af
,slash
,&sl
->mask
)) {
234 configparseerr(ads
,fn
,lno
,"invalid mask `%s' in sortlist",slash
);
238 maskwhat
= "prefix length";
239 initial
= strtoul(slash
,&ep
,10);
240 if (*ep
|| initial
>ai
->width
) {
241 configparseerr(ads
,fn
,lno
,"mask length `%s' invalid",slash
);
244 ai
->prefix_mask(initial
, &sl
->mask
);
247 maskwhat
= "implied prefix length";
248 initial
= ai
->guess_len(&sl
->base
);
250 configparseerr(ads
,fn
,lno
, "network address `%s'"
251 " in sortlist is not in classed ranges,"
252 " must specify mask explicitly", tbuf
);
255 ai
->prefix_mask(initial
, &sl
->mask
);
258 if (!ai
->matchp(&sl
->base
, &sl
->base
, &sl
->mask
)) {
260 configparseerr(ads
,fn
,lno
, "%s %d in sortlist"
261 " overlaps address `%s'",maskwhat
,initial
,tbuf
);
263 configparseerr(ads
,fn
,lno
, "%s `%s' in sortlist"
264 " overlaps address `%s'",maskwhat
,slash
,tbuf
);
274 static void ccf_options(adns_state ads
, const char *fn
,
275 int lno
, const char *buf
) {
283 while (nextword(&buf
,&word
,&l
)) {
284 if (l
==5 && !memcmp(word
,"debug",5)) {
285 ads
->iflags
|= adns_if_debug
;
288 if (l
>=6 && !memcmp(word
,"ndots:",6)) {
289 v
= strtoul(word
+6,&ep
,10);
290 if (l
==6 || ep
!= word
+l
|| v
> INT_MAX
) {
291 configparseerr(ads
,fn
,lno
,"option `%.*s' malformed"
292 " or has bad value",l
,word
);
298 if (l
>=12 && !memcmp(word
,"adns_checkc:",12)) {
299 if (!strcmp(word
+12,"none")) {
300 ads
->iflags
&= ~adns_if_checkc_freq
;
301 ads
->iflags
|= adns_if_checkc_entex
;
302 } else if (!strcmp(word
+12,"entex")) {
303 ads
->iflags
&= ~adns_if_checkc_freq
;
304 ads
->iflags
|= adns_if_checkc_entex
;
305 } else if (!strcmp(word
+12,"freq")) {
306 ads
->iflags
|= adns_if_checkc_freq
;
308 configparseerr(ads
,fn
,lno
, "option adns_checkc has bad value `%s' "
309 "(must be none, entex or freq", word
+12);
313 if (l
>=8 && !memcmp(word
,"adns_af:",8)) {
314 if (!strcmp(word
+8,"v4only"))
315 ads
->iflags
= (ads
->iflags
& ~adns_if_afmask
) | adns_if_af_v4only
;
316 else if (!strcmp(word
+8,"v6only"))
317 ads
->iflags
= (ads
->iflags
& ~adns_if_afmask
) | adns_if_af_v6only
;
318 else if (!strcmp(word
+8,"any"))
319 ads
->iflags
= (ads
->iflags
& ~adns_if_afmask
);
321 configparseerr(ads
,fn
,lno
, "option adns_af has bad value `%s' "
322 "(must be any, v4only or v6only", word
+8);
326 adns__diag(ads
,-1,0,"%s:%d: unknown option `%.*s'", fn
,lno
, l
,word
);
330 static void ccf_clearnss(adns_state ads
, const char *fn
,
331 int lno
, const char *buf
) {
335 static void ccf_include(adns_state ads
, const char *fn
,
336 int lno
, const char *buf
) {
338 configparseerr(ads
,fn
,lno
,"`include' directive with no filename");
341 readconfig(ads
,buf
,1);
344 static void ccf_lookup(adns_state ads
, const char *fn
, int lno
,
351 configparseerr(ads
,fn
,lno
,"`lookup' directive with no databases");
355 while (nextword(&buf
,&word
,&l
)) {
356 if (l
==4 && !memcmp(word
,"bind",4)) {
358 } else if (l
==4 && !memcmp(word
,"file",4)) {
359 /* ignore this and hope /etc/hosts is not essential */
360 } else if (l
==2 && !memcmp(word
,"yp",2)) {
361 adns__diag(ads
,-1,0,"%s:%d: yp lookups not supported by adns", fn
,lno
);
364 adns__diag(ads
,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
370 adns__diag(ads
,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn
,lno
);
373 static const struct configcommandinfo
{
375 void (*fn
)(adns_state ads
, const char *fn
, int lno
, const char *buf
);
376 } configcommandinfos
[]= {
377 { "nameserver", ccf_nameserver
},
378 { "domain", ccf_search
},
379 { "search", ccf_search
},
380 { "sortlist", ccf_sortlist
},
381 { "options", ccf_options
},
382 { "clearnameservers", ccf_clearnss
},
383 { "include", ccf_include
},
384 { "lookup", ccf_lookup
}, /* OpenBSD */
393 static int gl_file(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
394 int lno
, char *buf
, int buflen
) {
395 FILE *file
= src_io
->file
;
403 for (;;) { /* loop over chars */
405 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
410 adns__diag(ads
,-1,0,"%s:%d: line contains nul, ignored",filename
,lno
);
412 } else if (c
== '\n') {
414 } else if (c
== EOF
) {
417 adns__diag(ads
,-1,0,"%s:%d: read error: %s",
418 filename
,lno
,strerror(errno
));
434 while ((c
= getc(file
)) != EOF
&& c
!= '\n');
438 static int gl_text(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
439 int lno
, char *buf
, int buflen
) {
440 const char *cp
= src_io
->text
;
443 if (!cp
|| !*cp
) return -1;
445 if (*cp
== ';' || *cp
== '\n') cp
++;
446 l
= strcspn(cp
,";\n");
450 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
460 static void readconfiggeneric(adns_state ads
, const char *filename
,
461 int (*getline
)(adns_state ads
, getline_ctx
*,
462 const char *filename
, int lno
,
463 char *buf
, int buflen
),
464 /* Returns >=0 for success, -1 for EOF or error
465 * (error will have been reported), or -2 for
466 * bad line was encountered, try again.
468 getline_ctx gl_ctx
) {
469 char linebuf
[2000], *p
, *q
;
471 const struct configcommandinfo
*ccip
;
474 (l
= getline(ads
,&gl_ctx
, filename
,lno
, linebuf
,sizeof(linebuf
))) != -1;
476 if (l
== -2) continue;
477 while (l
>0 && ctype_whitespace(linebuf
[l
-1])) l
--;
480 while (ctype_whitespace(*p
)) p
++;
481 if (*p
== '#' || *p
== ';' || !*p
) continue;
483 while (*q
&& !ctype_whitespace(*q
)) q
++;
485 for (ccip
=configcommandinfos
;
487 !(strlen(ccip
->name
)==dirl
&& !memcmp(ccip
->name
,p
,q
-p
));
490 adns__diag(ads
,-1,0,"%s:%d: unknown configuration directive `%.*s'",
491 filename
,lno
,(int)(q
-p
),p
);
494 while (ctype_whitespace(*q
)) q
++;
495 ccip
->fn(ads
,filename
,lno
,q
);
499 static const char *instrum_getenv(adns_state ads
, const char *envvar
) {
502 value
= getenv(envvar
);
503 if (!value
) adns__debug(ads
,-1,0,"environment variable %s not set",envvar
);
504 else adns__debug(ads
,-1,0,"environment variable %s"
505 " set to `%s'",envvar
,value
);
509 static void readconfig(adns_state ads
, const char *filename
, int warnmissing
) {
512 gl_ctx
.file
= fopen(filename
,"r");
514 if (errno
== ENOENT
) {
516 adns__debug(ads
,-1,0, "configuration file"
517 " `%s' does not exist",filename
);
521 adns__diag(ads
,-1,0,"cannot open configuration file `%s': %s",
522 filename
,strerror(errno
));
526 readconfiggeneric(ads
,filename
,gl_file
,gl_ctx
);
531 static void readconfigtext(adns_state ads
, const char *text
,
532 const char *showname
) {
536 readconfiggeneric(ads
,showname
,gl_text
,gl_ctx
);
539 static void readconfigenv(adns_state ads
, const char *envvar
) {
540 const char *filename
;
542 if (ads
->iflags
& adns_if_noenv
) {
543 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
546 filename
= instrum_getenv(ads
,envvar
);
547 if (filename
) readconfig(ads
,filename
,1);
550 static void readconfigenvtext(adns_state ads
, const char *envvar
) {
551 const char *textdata
;
553 if (ads
->iflags
& adns_if_noenv
) {
554 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
557 textdata
= instrum_getenv(ads
,envvar
);
558 if (textdata
) readconfigtext(ads
,textdata
,envvar
);
562 int adns__setnonblock(adns_state ads
, int fd
) {
565 r
= fcntl(fd
,F_GETFL
,0); if (r
<0) return errno
;
567 r
= fcntl(fd
,F_SETFL
,r
); if (r
<0) return errno
;
571 static int init_begin(adns_state
*ads_r
, adns_initflags flags
,
572 adns_logcallbackfn
*logfn
, void *logfndata
) {
576 ads
= malloc(sizeof(*ads
)); if (!ads
) return errno
;
580 ads
->logfndata
= logfndata
;
582 LIST_INIT(ads
->udpw
);
583 LIST_INIT(ads
->tcpw
);
584 LIST_INIT(ads
->childw
);
585 LIST_INIT(ads
->output
);
590 adns__vbuf_init(&ads
->tcpsend
);
591 adns__vbuf_init(&ads
->tcprecv
);
592 ads
->tcprecv_skip
= 0;
593 ads
->nservers
= ads
->nsortlist
= ads
->nsearchlist
= ads
->tcpserver
= 0;
595 ads
->tcpstate
= server_disconnected
;
596 timerclear(&ads
->tcptimeout
);
600 ads
->rand48xsubi
[0]= pid
;
601 ads
->rand48xsubi
[1]= (unsigned long)pid
>> 16;
602 ads
->rand48xsubi
[2]= pid
^ ((unsigned long)pid
>> 16);
608 static int init_finish(adns_state ads
) {
609 struct sockaddr_in sin
;
610 struct protoent
*proto
;
611 struct udpsocket
*udp
;
615 if (!ads
->nservers
) {
616 if (ads
->logfn
&& ads
->iflags
& adns_if_debug
)
617 adns__lprintf(ads
,"adns: no nameservers, using IPv4 localhost\n");
618 memset(&sin
, 0, sizeof(sin
));
619 sin
.sin_port
= htons(DNS_PORT
);
620 sin
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
621 addserver(ads
,(struct sockaddr
*)&sin
, sizeof(sin
));
624 proto
= getprotobyname("udp"); if (!proto
) { r
= ENOPROTOOPT
; goto x_free
; }
626 for (i
= 0; i
< ads
->nservers
; i
++) {
627 for (j
= 0; j
< ads
->nudp
; j
++) {
628 if (ads
->udpsocket
[j
].ai
->af
== ads
->servers
[i
].addr
.sa
.sa_family
)
632 assert(ads
->nudp
< MAXUDP
);
633 udp
= &ads
->udpsocket
[ads
->nudp
];
634 udp
->ai
= find_afinfo(ads
->servers
[i
].addr
.sa
.sa_family
);
636 udp
->fd
= socket(udp
->ai
->af
,SOCK_DGRAM
,proto
->p_proto
);
637 if (udp
->fd
< 0) { r
= errno
; goto x_free
; }
638 r
= adns__setnonblock(ads
,udp
->fd
);
639 if (r
) { r
= errno
; goto x_closeudp
; }
648 for (j
= 0; j
< ads
->nudp
; j
++) close(ads
->udpsocket
[j
].fd
);
654 static void init_abort(adns_state ads
) {
655 if (ads
->nsearchlist
) {
656 free(ads
->searchlist
[0]);
657 free(ads
->searchlist
);
662 static void logfn_file(adns_state ads
, void *logfndata
,
663 const char *fmt
, va_list al
) {
664 vfprintf(logfndata
,fmt
,al
);
667 static int init_files(adns_state
*ads_r
, adns_initflags flags
,
668 adns_logcallbackfn
*logfn
, void *logfndata
) {
670 const char *res_options
, *adns_res_options
;
673 r
= init_begin(&ads
, flags
, logfn
, logfndata
);
676 res_options
= instrum_getenv(ads
,"RES_OPTIONS");
677 adns_res_options
= instrum_getenv(ads
,"ADNS_RES_OPTIONS");
678 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
679 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
681 readconfig(ads
,"/etc/resolv.conf",1);
682 readconfig(ads
,"/etc/resolv-adns.conf",0);
683 readconfigenv(ads
,"RES_CONF");
684 readconfigenv(ads
,"ADNS_RES_CONF");
686 readconfigenvtext(ads
,"RES_CONF_TEXT");
687 readconfigenvtext(ads
,"ADNS_RES_CONF_TEXT");
689 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
690 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
692 ccf_search(ads
,"LOCALDOMAIN",-1,instrum_getenv(ads
,"LOCALDOMAIN"));
693 ccf_search(ads
,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads
,"ADNS_LOCALDOMAIN"));
695 if (ads
->configerrno
&& ads
->configerrno
!= EINVAL
) {
704 adns__consistency(ads
,0,cc_entex
);
709 int adns_init(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
710 return init_files(ads_r
, flags
, logfn_file
, diagfile ? diagfile
: stderr
);
713 static int init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
714 adns_logcallbackfn
*logfn
, void *logfndata
,
715 const char *configtext
) {
719 r
= init_begin(&ads
, flags
, logfn
, logfndata
);
722 readconfigtext(ads
,configtext
,"<supplied configuration text>");
723 if (ads
->configerrno
) {
729 r
= init_finish(ads
); if (r
) return r
;
730 adns__consistency(ads
,0,cc_entex
);
735 int adns_init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
736 FILE *diagfile
, const char *configtext
) {
737 return init_strcfg(ads_r
, flags
,
738 diagfile ? logfn_file
: 0, diagfile
,
742 int adns_init_logfn(adns_state
*newstate_r
, adns_initflags flags
,
743 const char *configtext
/*0=>use default config files*/,
744 adns_logcallbackfn
*logfn
/*0=>logfndata is a FILE* */,
745 void *logfndata
/*0 with logfn==0 => discard*/) {
746 if (!logfn
&& logfndata
)
749 return init_strcfg(newstate_r
, flags
, logfn
, logfndata
, configtext
);
751 return init_files(newstate_r
, flags
, logfn
, logfndata
);
754 void adns_finish(adns_state ads
) {
756 adns__consistency(ads
,0,cc_entex
);
758 if (ads
->udpw
.head
) adns_cancel(ads
->udpw
.head
);
759 else if (ads
->tcpw
.head
) adns_cancel(ads
->tcpw
.head
);
760 else if (ads
->childw
.head
) adns_cancel(ads
->childw
.head
);
761 else if (ads
->output
.head
) adns_cancel(ads
->output
.head
);
764 for (i
= 0; i
< ads
->nudp
; i
++) close(ads
->udpsocket
[i
].fd
);
765 if (ads
->tcpsocket
>= 0) close(ads
->tcpsocket
);
766 adns__vbuf_free(&ads
->tcpsend
);
767 adns__vbuf_free(&ads
->tcprecv
);
772 void adns_forallqueries_begin(adns_state ads
) {
773 adns__consistency(ads
,0,cc_entex
);
775 ads
->udpw
.head ? ads
->udpw
.head
:
776 ads
->tcpw
.head ? ads
->tcpw
.head
:
777 ads
->childw
.head ? ads
->childw
.head
:
781 adns_query
adns_forallqueries_next(adns_state ads
, void **context_r
) {
784 adns__consistency(ads
,0,cc_entex
);
785 nqu
= ads
->forallnext
;
791 } else if (qu
== ads
->udpw
.tail
) {
793 ads
->tcpw
.head ? ads
->tcpw
.head
:
794 ads
->childw
.head ? ads
->childw
.head
:
796 } else if (qu
== ads
->tcpw
.tail
) {
798 ads
->childw
.head ? ads
->childw
.head
:
800 } else if (qu
== ads
->childw
.tail
) {
801 nqu
= ads
->output
.head
;
805 if (!qu
->parent
) break;
807 ads
->forallnext
= nqu
;
808 if (context_r
) *context_r
= qu
->ctx
.ext
;