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
) {
63 char buf
[MAX_ADDRSTRLEN
];
65 ai
= find_afinfo(sa
->sa_family
);
68 "nameserver %s for unknown address family %d ignored",
69 adns__sockaddr_ntoa(sa
, n
, buf
), sa
->sa_family
);
72 for (i
=0; i
<ads
->nservers
; i
++) {
73 if (ads
->servers
[i
].addr
.sa
.sa_family
== sa
->sa_family
&&
74 ai
->sockaddr_equalp(sa
, &ads
->servers
[i
].addr
.sa
)) {
75 adns__debug(ads
,-1,0,"duplicate nameserver %s ignored",
76 adns__sockaddr_ntoa(sa
, n
, buf
));
81 if (ads
->nservers
>=MAXSERVERS
) {
82 adns__diag(ads
,-1,0,"too many nameservers, ignoring %s",
83 adns__sockaddr_ntoa(sa
, n
, buf
));
87 ss
= ads
->servers
+ads
->nservers
;
88 assert(n
<= sizeof(ss
->addr
));
90 memcpy(&ss
->addr
, sa
, n
);
94 static void freesearchlist(adns_state ads
) {
95 if (ads
->nsearchlist
) free(*ads
->searchlist
);
96 free(ads
->searchlist
);
99 static void saveerr(adns_state ads
, int en
) {
100 if (!ads
->configerrno
) ads
->configerrno
= en
;
103 static void configparseerr(adns_state ads
, const char *fn
, int lno
,
104 const char *fmt
, ...) {
108 if (!ads
->logfn
|| (ads
->iflags
& adns_if_noerrprint
)) return;
110 if (lno
==-1) adns__lprintf(ads
,"adns: %s: ",fn
);
111 else adns__lprintf(ads
,"adns: %s:%d: ",fn
,lno
);
113 adns__vlprintf(ads
,fmt
,al
);
115 adns__lprintf(ads
,"\n");
118 static int nextword(const char **bufp_io
, const char **word_r
, int *l_r
) {
122 while (ctype_whitespace(*p
)) p
++;
126 while (*q
&& !ctype_whitespace(*q
)) q
++;
135 static void ccf_nameserver(adns_state ads
, const char *fn
,
136 int lno
, const char *buf
) {
137 struct addrinfo
*ai
, ai_hint
= { 0 };
138 char addrbuf
[MAX_ADDRSTRLEN
];
141 ai_hint
.ai_family
= AF_UNSPEC
;
142 ai_hint
.ai_socktype
= SOCK_DGRAM
;
143 ai_hint
.ai_flags
= AI_NUMERICHOST
| AI_NUMERICSERV
;
145 err
= getaddrinfo(buf
, STRINGIFY(DNS_PORT
), &ai_hint
, &ai
);
147 configparseerr(ads
,fn
,lno
,"invalid nameserver address `%s' (%s)",
148 buf
, gai_strerror(err
));
152 adns__debug(ads
,-1,0,"using nameserver %s",
153 adns__sockaddr_ntoa(ai
->ai_addr
, ai
->ai_addrlen
, addrbuf
));
154 addserver(ads
, ai
->ai_addr
, ai
->ai_addrlen
);
158 static void ccf_search(adns_state ads
, const char *fn
,
159 int lno
, const char *buf
) {
160 const char *bufp
, *word
;
161 char *newchars
, **newptrs
, **pp
;
169 while (nextword(&bufp
,&word
,&l
)) { count
++; tl
+= l
+1; }
171 newptrs
= malloc(sizeof(char*)*count
);
172 if (!newptrs
) { saveerr(ads
,errno
); return; }
174 newchars
= malloc(tl
);
175 if (!newchars
) { saveerr(ads
,errno
); free(newptrs
); return; }
179 while (nextword(&bufp
,&word
,&l
)) {
181 memcpy(newchars
,word
,l
);
187 ads
->nsearchlist
= count
;
188 ads
->searchlist
= newptrs
;
191 static void ccf_sortlist(adns_state ads
, const char *fn
,
192 int lno
, const char *buf
) {
194 char tbuf
[200], *slash
, *ep
;
195 const char *maskwhat
;
204 while (nextword(&buf
,&word
,&l
)) {
205 if (ads
->nsortlist
>= MAXSORTLIST
) {
206 adns__diag(ads
,-1,0,"too many sortlist entries,"
207 " ignoring %.*s onwards",l
,word
);
211 if (l
>= sizeof(tbuf
)) {
212 configparseerr(ads
,fn
,lno
,"sortlist entry `%.*s' too long",l
,word
);
216 memcpy(tbuf
,word
,l
); tbuf
[l
]= 0;
217 slash
= strchr(tbuf
,'/');
218 if (slash
) *slash
++= 0;
220 sl
= &ads
->sortlist
[ads
->nsortlist
];
222 if (strchr(tbuf
, ':'))
223 ai
= &adns__inet6_afinfo
;
225 ai
= &adns__inet_afinfo
;
227 if (!inet_pton(ai
->af
, tbuf
, &sl
->base
)) {
228 configparseerr(ads
,fn
,lno
,"invalid address `%s' in sortlist",tbuf
);
233 if (strchr(slash
,ai
->delim
)) {
235 if (!inet_pton(ai
->af
,slash
,&sl
->mask
)) {
236 configparseerr(ads
,fn
,lno
,"invalid mask `%s' in sortlist",slash
);
240 maskwhat
= "prefix length";
241 initial
= strtoul(slash
,&ep
,10);
242 if (*ep
|| initial
>ai
->width
) {
243 configparseerr(ads
,fn
,lno
,"mask length `%s' invalid",slash
);
246 ai
->prefix_mask(initial
, &sl
->mask
);
249 maskwhat
= "implied prefix length";
250 initial
= ai
->guess_len(&sl
->base
);
252 configparseerr(ads
,fn
,lno
, "network address `%s'"
253 " in sortlist is not in classed ranges,"
254 " must specify mask explicitly", tbuf
);
257 ai
->prefix_mask(initial
, &sl
->mask
);
260 if (!ai
->matchp(&sl
->base
, &sl
->base
, &sl
->mask
)) {
262 configparseerr(ads
,fn
,lno
, "%s %d in sortlist"
263 " overlaps address `%s'",maskwhat
,initial
,tbuf
);
265 configparseerr(ads
,fn
,lno
, "%s `%s' in sortlist"
266 " overlaps address `%s'",maskwhat
,slash
,tbuf
);
276 static void ccf_options(adns_state ads
, const char *fn
,
277 int lno
, const char *buf
) {
285 while (nextword(&buf
,&word
,&l
)) {
286 if (l
==5 && !memcmp(word
,"debug",5)) {
287 ads
->iflags
|= adns_if_debug
;
290 if (l
>=6 && !memcmp(word
,"ndots:",6)) {
291 v
= strtoul(word
+6,&ep
,10);
292 if (l
==6 || ep
!= word
+l
|| v
> INT_MAX
) {
293 configparseerr(ads
,fn
,lno
,"option `%.*s' malformed"
294 " or has bad value",l
,word
);
300 if (l
>=12 && !memcmp(word
,"adns_checkc:",12)) {
301 if (!strcmp(word
+12,"none")) {
302 ads
->iflags
&= ~adns_if_checkc_freq
;
303 ads
->iflags
|= adns_if_checkc_entex
;
304 } else if (!strcmp(word
+12,"entex")) {
305 ads
->iflags
&= ~adns_if_checkc_freq
;
306 ads
->iflags
|= adns_if_checkc_entex
;
307 } else if (!strcmp(word
+12,"freq")) {
308 ads
->iflags
|= adns_if_checkc_freq
;
310 configparseerr(ads
,fn
,lno
, "option adns_checkc has bad value `%s' "
311 "(must be none, entex or freq", word
+12);
315 if (l
>=8 && !memcmp(word
,"adns_af:",8)) {
316 if (!strcmp(word
+8,"v4only"))
317 ads
->iflags
= (ads
->iflags
& ~adns_if_afmask
) | adns_if_af_v4only
;
318 else if (!strcmp(word
+8,"v6only"))
319 ads
->iflags
= (ads
->iflags
& ~adns_if_afmask
) | adns_if_af_v6only
;
320 else if (!strcmp(word
+8,"any"))
321 ads
->iflags
= (ads
->iflags
& ~adns_if_afmask
);
323 configparseerr(ads
,fn
,lno
, "option adns_af has bad value `%s' "
324 "(must be any, v4only or v6only", word
+8);
328 adns__diag(ads
,-1,0,"%s:%d: unknown option `%.*s'", fn
,lno
, l
,word
);
332 static void ccf_clearnss(adns_state ads
, const char *fn
,
333 int lno
, const char *buf
) {
337 static void ccf_include(adns_state ads
, const char *fn
,
338 int lno
, const char *buf
) {
340 configparseerr(ads
,fn
,lno
,"`include' directive with no filename");
343 readconfig(ads
,buf
,1);
346 static void ccf_lookup(adns_state ads
, const char *fn
, int lno
,
353 configparseerr(ads
,fn
,lno
,"`lookup' directive with no databases");
357 while (nextword(&buf
,&word
,&l
)) {
358 if (l
==4 && !memcmp(word
,"bind",4)) {
360 } else if (l
==4 && !memcmp(word
,"file",4)) {
361 /* ignore this and hope /etc/hosts is not essential */
362 } else if (l
==2 && !memcmp(word
,"yp",2)) {
363 adns__diag(ads
,-1,0,"%s:%d: yp lookups not supported by adns", fn
,lno
);
366 adns__diag(ads
,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
372 adns__diag(ads
,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn
,lno
);
375 static const struct configcommandinfo
{
377 void (*fn
)(adns_state ads
, const char *fn
, int lno
, const char *buf
);
378 } configcommandinfos
[]= {
379 { "nameserver", ccf_nameserver
},
380 { "domain", ccf_search
},
381 { "search", ccf_search
},
382 { "sortlist", ccf_sortlist
},
383 { "options", ccf_options
},
384 { "clearnameservers", ccf_clearnss
},
385 { "include", ccf_include
},
386 { "lookup", ccf_lookup
}, /* OpenBSD */
395 static int gl_file(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
396 int lno
, char *buf
, int buflen
) {
397 FILE *file
= src_io
->file
;
405 for (;;) { /* loop over chars */
407 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
412 adns__diag(ads
,-1,0,"%s:%d: line contains nul, ignored",filename
,lno
);
414 } else if (c
== '\n') {
416 } else if (c
== EOF
) {
419 adns__diag(ads
,-1,0,"%s:%d: read error: %s",
420 filename
,lno
,strerror(errno
));
436 while ((c
= getc(file
)) != EOF
&& c
!= '\n');
440 static int gl_text(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
441 int lno
, char *buf
, int buflen
) {
442 const char *cp
= src_io
->text
;
445 if (!cp
|| !*cp
) return -1;
447 if (*cp
== ';' || *cp
== '\n') cp
++;
448 l
= strcspn(cp
,";\n");
452 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
462 static void readconfiggeneric(adns_state ads
, const char *filename
,
463 int (*getline
)(adns_state ads
, getline_ctx
*,
464 const char *filename
, int lno
,
465 char *buf
, int buflen
),
466 /* Returns >=0 for success, -1 for EOF or error
467 * (error will have been reported), or -2 for
468 * bad line was encountered, try again.
470 getline_ctx gl_ctx
) {
471 char linebuf
[2000], *p
, *q
;
473 const struct configcommandinfo
*ccip
;
476 (l
= getline(ads
,&gl_ctx
, filename
,lno
, linebuf
,sizeof(linebuf
))) != -1;
478 if (l
== -2) continue;
479 while (l
>0 && ctype_whitespace(linebuf
[l
-1])) l
--;
482 while (ctype_whitespace(*p
)) p
++;
483 if (*p
== '#' || *p
== ';' || !*p
) continue;
485 while (*q
&& !ctype_whitespace(*q
)) q
++;
487 for (ccip
=configcommandinfos
;
489 !(strlen(ccip
->name
)==dirl
&& !memcmp(ccip
->name
,p
,q
-p
));
492 adns__diag(ads
,-1,0,"%s:%d: unknown configuration directive `%.*s'",
493 filename
,lno
,(int)(q
-p
),p
);
496 while (ctype_whitespace(*q
)) q
++;
497 ccip
->fn(ads
,filename
,lno
,q
);
501 static const char *instrum_getenv(adns_state ads
, const char *envvar
) {
504 value
= getenv(envvar
);
505 if (!value
) adns__debug(ads
,-1,0,"environment variable %s not set",envvar
);
506 else adns__debug(ads
,-1,0,"environment variable %s"
507 " set to `%s'",envvar
,value
);
511 static void readconfig(adns_state ads
, const char *filename
, int warnmissing
) {
514 gl_ctx
.file
= fopen(filename
,"r");
516 if (errno
== ENOENT
) {
518 adns__debug(ads
,-1,0, "configuration file"
519 " `%s' does not exist",filename
);
523 adns__diag(ads
,-1,0,"cannot open configuration file `%s': %s",
524 filename
,strerror(errno
));
528 readconfiggeneric(ads
,filename
,gl_file
,gl_ctx
);
533 static void readconfigtext(adns_state ads
, const char *text
,
534 const char *showname
) {
538 readconfiggeneric(ads
,showname
,gl_text
,gl_ctx
);
541 static void readconfigenv(adns_state ads
, const char *envvar
) {
542 const char *filename
;
544 if (ads
->iflags
& adns_if_noenv
) {
545 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
548 filename
= instrum_getenv(ads
,envvar
);
549 if (filename
) readconfig(ads
,filename
,1);
552 static void readconfigenvtext(adns_state ads
, const char *envvar
) {
553 const char *textdata
;
555 if (ads
->iflags
& adns_if_noenv
) {
556 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
559 textdata
= instrum_getenv(ads
,envvar
);
560 if (textdata
) readconfigtext(ads
,textdata
,envvar
);
564 int adns__setnonblock(adns_state ads
, int fd
) {
567 r
= fcntl(fd
,F_GETFL
,0); if (r
<0) return errno
;
569 r
= fcntl(fd
,F_SETFL
,r
); if (r
<0) return errno
;
573 static int init_begin(adns_state
*ads_r
, adns_initflags flags
,
574 adns_logcallbackfn
*logfn
, void *logfndata
) {
578 ads
= malloc(sizeof(*ads
)); if (!ads
) return errno
;
582 ads
->logfndata
= logfndata
;
584 LIST_INIT(ads
->udpw
);
585 LIST_INIT(ads
->tcpw
);
586 LIST_INIT(ads
->childw
);
587 LIST_INIT(ads
->output
);
592 adns__vbuf_init(&ads
->tcpsend
);
593 adns__vbuf_init(&ads
->tcprecv
);
594 ads
->tcprecv_skip
= 0;
595 ads
->nservers
= ads
->nsortlist
= ads
->nsearchlist
= ads
->tcpserver
= 0;
597 ads
->tcpstate
= server_disconnected
;
598 timerclear(&ads
->tcptimeout
);
602 ads
->rand48xsubi
[0]= pid
;
603 ads
->rand48xsubi
[1]= (unsigned long)pid
>> 16;
604 ads
->rand48xsubi
[2]= pid
^ ((unsigned long)pid
>> 16);
610 static int init_finish(adns_state ads
) {
611 struct sockaddr_in sin
;
612 struct protoent
*proto
;
613 struct udpsocket
*udp
;
617 if (!ads
->nservers
) {
618 if (ads
->logfn
&& ads
->iflags
& adns_if_debug
)
619 adns__lprintf(ads
,"adns: no nameservers, using IPv4 localhost\n");
620 memset(&sin
, 0, sizeof(sin
));
621 sin
.sin_family
= AF_INET
;
622 sin
.sin_port
= htons(DNS_PORT
);
623 sin
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
624 addserver(ads
,(struct sockaddr
*)&sin
, sizeof(sin
));
627 proto
= getprotobyname("udp"); if (!proto
) { r
= ENOPROTOOPT
; goto x_free
; }
629 for (i
= 0; i
< ads
->nservers
; i
++) {
630 for (j
= 0; j
< ads
->nudp
; j
++) {
631 if (ads
->udpsocket
[j
].ai
->af
== ads
->servers
[i
].addr
.sa
.sa_family
)
635 assert(ads
->nudp
< MAXUDP
);
636 udp
= &ads
->udpsocket
[ads
->nudp
];
637 udp
->ai
= find_afinfo(ads
->servers
[i
].addr
.sa
.sa_family
);
639 udp
->fd
= socket(udp
->ai
->af
,SOCK_DGRAM
,proto
->p_proto
);
640 if (udp
->fd
< 0) { r
= errno
; goto x_free
; }
641 r
= adns__setnonblock(ads
,udp
->fd
);
642 if (r
) { r
= errno
; goto x_closeudp
; }
651 for (j
= 0; j
< ads
->nudp
; j
++) close(ads
->udpsocket
[j
].fd
);
657 static void init_abort(adns_state ads
) {
658 if (ads
->nsearchlist
) {
659 free(ads
->searchlist
[0]);
660 free(ads
->searchlist
);
665 static void logfn_file(adns_state ads
, void *logfndata
,
666 const char *fmt
, va_list al
) {
667 vfprintf(logfndata
,fmt
,al
);
670 static int init_files(adns_state
*ads_r
, adns_initflags flags
,
671 adns_logcallbackfn
*logfn
, void *logfndata
) {
673 const char *res_options
, *adns_res_options
;
676 r
= init_begin(&ads
, flags
, logfn
, logfndata
);
679 res_options
= instrum_getenv(ads
,"RES_OPTIONS");
680 adns_res_options
= instrum_getenv(ads
,"ADNS_RES_OPTIONS");
681 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
682 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
684 readconfig(ads
,"/etc/resolv.conf",1);
685 readconfig(ads
,"/etc/resolv-adns.conf",0);
686 readconfigenv(ads
,"RES_CONF");
687 readconfigenv(ads
,"ADNS_RES_CONF");
689 readconfigenvtext(ads
,"RES_CONF_TEXT");
690 readconfigenvtext(ads
,"ADNS_RES_CONF_TEXT");
692 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
693 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
695 ccf_search(ads
,"LOCALDOMAIN",-1,instrum_getenv(ads
,"LOCALDOMAIN"));
696 ccf_search(ads
,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads
,"ADNS_LOCALDOMAIN"));
698 if (ads
->configerrno
&& ads
->configerrno
!= EINVAL
) {
707 adns__consistency(ads
,0,cc_entex
);
712 int adns_init(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
713 return init_files(ads_r
, flags
, logfn_file
, diagfile ? diagfile
: stderr
);
716 static int init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
717 adns_logcallbackfn
*logfn
, void *logfndata
,
718 const char *configtext
) {
722 r
= init_begin(&ads
, flags
, logfn
, logfndata
);
725 readconfigtext(ads
,configtext
,"<supplied configuration text>");
726 if (ads
->configerrno
) {
732 r
= init_finish(ads
); if (r
) return r
;
733 adns__consistency(ads
,0,cc_entex
);
738 int adns_init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
739 FILE *diagfile
, const char *configtext
) {
740 return init_strcfg(ads_r
, flags
,
741 diagfile ? logfn_file
: 0, diagfile
,
745 int adns_init_logfn(adns_state
*newstate_r
, adns_initflags flags
,
746 const char *configtext
/*0=>use default config files*/,
747 adns_logcallbackfn
*logfn
/*0=>logfndata is a FILE* */,
748 void *logfndata
/*0 with logfn==0 => discard*/) {
749 if (!logfn
&& logfndata
)
752 return init_strcfg(newstate_r
, flags
, logfn
, logfndata
, configtext
);
754 return init_files(newstate_r
, flags
, logfn
, logfndata
);
757 void adns_finish(adns_state ads
) {
759 adns__consistency(ads
,0,cc_entex
);
761 if (ads
->udpw
.head
) adns_cancel(ads
->udpw
.head
);
762 else if (ads
->tcpw
.head
) adns_cancel(ads
->tcpw
.head
);
763 else if (ads
->childw
.head
) adns_cancel(ads
->childw
.head
);
764 else if (ads
->output
.head
) adns_cancel(ads
->output
.head
);
767 for (i
= 0; i
< ads
->nudp
; i
++) close(ads
->udpsocket
[i
].fd
);
768 if (ads
->tcpsocket
>= 0) close(ads
->tcpsocket
);
769 adns__vbuf_free(&ads
->tcpsend
);
770 adns__vbuf_free(&ads
->tcprecv
);
775 void adns_forallqueries_begin(adns_state ads
) {
776 adns__consistency(ads
,0,cc_entex
);
778 ads
->udpw
.head ? ads
->udpw
.head
:
779 ads
->tcpw
.head ? ads
->tcpw
.head
:
780 ads
->childw
.head ? ads
->childw
.head
:
784 adns_query
adns_forallqueries_next(adns_state ads
, void **context_r
) {
787 adns__consistency(ads
,0,cc_entex
);
788 nqu
= ads
->forallnext
;
794 } else if (qu
== ads
->udpw
.tail
) {
796 ads
->tcpw
.head ? ads
->tcpw
.head
:
797 ads
->childw
.head ? ads
->childw
.head
:
799 } else if (qu
== ads
->tcpw
.tail
) {
801 ads
->childw
.head ? ads
->childw
.head
:
803 } else if (qu
== ads
->childw
.tail
) {
804 nqu
= ads
->output
.head
;
808 if (!qu
->parent
) break;
810 ads
->forallnext
= nqu
;
811 if (context_r
) *context_r
= qu
->ctx
.ext
;