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
, const struct sockaddr
*sa
, int n
) {
47 char buf
[ADNS_ADDR2TEXT_BUFLEN
];
49 if (sa
->sa_family
!= AF_INET
) {
50 adns__debug(ads
,-1,0,"non-IPv4 nameserver %s ignored",
51 adns__sockaddr_ntoa(sa
, buf
));
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
, buf
));
63 if (ads
->nservers
>=MAXSERVERS
) {
64 adns__diag(ads
,-1,0,"too many nameservers, ignoring %s",
65 adns__sockaddr_ntoa(sa
, 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
) {
120 char addrbuf
[ADNS_ADDR2TEXT_BUFLEN
];
123 a
.len
= sizeof(a
.addr
);
124 err
= adns_text2addr(buf
,DNS_PORT
, 0, &a
.addr
.sa
,&a
.len
);
129 configparseerr(ads
,fn
,lno
,"invalid nameserver address `%s'",buf
);
132 configparseerr(ads
,fn
,lno
,"failed to parse nameserver address `%s': %s",
136 adns__debug(ads
,-1,0,"using nameserver %s",
137 adns__sockaddr_ntoa(&a
.addr
.sa
, addrbuf
));
138 addserver(ads
,&a
.addr
.sa
,a
.len
);
141 static void ccf_search(adns_state ads
, const char *fn
,
142 int lno
, const char *buf
) {
143 const char *bufp
, *word
;
144 char *newchars
, **newptrs
, **pp
;
152 while (nextword(&bufp
,&word
,&l
)) { count
++; tl
+= l
+1; }
154 newptrs
= malloc(sizeof(char*)*count
);
155 if (!newptrs
) { saveerr(ads
,errno
); return; }
157 newchars
= malloc(tl
);
158 if (!newchars
) { saveerr(ads
,errno
); free(newptrs
); return; }
162 while (nextword(&bufp
,&word
,&l
)) {
164 memcpy(newchars
,word
,l
);
170 ads
->nsearchlist
= count
;
171 ads
->searchlist
= newptrs
;
174 static int gen_pton(const char *text
, int *af_io
, union gen_addr
*a
) {
178 addr
.len
= sizeof(addr
.addr
);
179 err
= adns_text2addr(text
,0, adns_qf_addrlit_scope_forbid
,
180 &addr
.addr
.sa
, &addr
.len
);
181 if (err
) { assert(err
== EINVAL
); return 0; }
182 if (*af_io
== AF_UNSPEC
) *af_io
= addr
.addr
.sa
.sa_family
;
183 else if (*af_io
!= addr
.addr
.sa
.sa_family
) return 0;
184 adns__sockaddr_extract(&addr
.addr
.sa
, a
, 0);
188 static void ccf_sortlist(adns_state ads
, const char *fn
,
189 int lno
, const char *buf
) {
191 char tbuf
[200], *slash
, *ep
;
192 const char *maskwhat
;
201 while (nextword(&buf
,&word
,&l
)) {
202 if (ads
->nsortlist
>= MAXSORTLIST
) {
203 adns__diag(ads
,-1,0,"too many sortlist entries,"
204 " ignoring %.*s onwards",l
,word
);
208 if (l
>= sizeof(tbuf
)) {
209 configparseerr(ads
,fn
,lno
,"sortlist entry `%.*s' too long",l
,word
);
213 memcpy(tbuf
,word
,l
); tbuf
[l
]= 0;
214 slash
= strchr(tbuf
,'/');
215 if (slash
) *slash
++= 0;
217 sl
= &ads
->sortlist
[ads
->nsortlist
];
219 if (!gen_pton(tbuf
, &af
, &sl
->base
)) {
220 configparseerr(ads
,fn
,lno
,"invalid address `%s' in sortlist",tbuf
);
225 if (slash
[strspn(slash
, "0123456789")]) {
227 if (!gen_pton(slash
,&af
,&sl
->mask
)) {
228 configparseerr(ads
,fn
,lno
,"invalid mask `%s' in sortlist",slash
);
232 maskwhat
= "prefix length";
233 initial
= strtoul(slash
,&ep
,10);
234 if (*ep
|| initial
>adns__addr_width(af
)) {
235 configparseerr(ads
,fn
,lno
,"mask length `%s' invalid",slash
);
238 adns__prefix_mask(af
, initial
, &sl
->mask
);
241 maskwhat
= "implied prefix length";
242 initial
= adns__guess_prefix_length(af
, &sl
->base
);
244 configparseerr(ads
,fn
,lno
, "network address `%s'"
245 " in sortlist is not in classed ranges,"
246 " must specify mask explicitly", tbuf
);
249 adns__prefix_mask(af
, initial
, &sl
->mask
);
252 if (!adns__addr_match_p(af
,&sl
->base
, af
,&sl
->base
,&sl
->mask
)) {
254 configparseerr(ads
,fn
,lno
, "%s %d in sortlist"
255 " overlaps address `%s'",maskwhat
,initial
,tbuf
);
257 configparseerr(ads
,fn
,lno
, "%s `%s' in sortlist"
258 " overlaps address `%s'",maskwhat
,slash
,tbuf
);
268 static void ccf_options(adns_state ads
, const char *fn
,
269 int lno
, const char *buf
) {
277 while (nextword(&buf
,&word
,&l
)) {
278 if (l
==5 && !memcmp(word
,"debug",5)) {
279 ads
->iflags
|= adns_if_debug
;
282 if (l
>=6 && !memcmp(word
,"ndots:",6)) {
283 v
= strtoul(word
+6,&ep
,10);
284 if (l
==6 || ep
!= word
+l
|| v
> INT_MAX
) {
285 configparseerr(ads
,fn
,lno
,"option `%.*s' malformed"
286 " or has bad value",l
,word
);
292 if (l
>=12 && !memcmp(word
,"adns_checkc:",12)) {
293 if (!strcmp(word
+12,"none")) {
294 ads
->iflags
&= ~adns_if_checkc_freq
;
295 ads
->iflags
|= adns_if_checkc_entex
;
296 } else if (!strcmp(word
+12,"entex")) {
297 ads
->iflags
&= ~adns_if_checkc_freq
;
298 ads
->iflags
|= adns_if_checkc_entex
;
299 } else if (!strcmp(word
+12,"freq")) {
300 ads
->iflags
|= adns_if_checkc_freq
;
302 configparseerr(ads
,fn
,lno
, "option adns_checkc has bad value `%s' "
303 "(must be none, entex or freq", word
+12);
307 adns__diag(ads
,-1,0,"%s:%d: unknown option `%.*s'", fn
,lno
, l
,word
);
311 static void ccf_clearnss(adns_state ads
, const char *fn
,
312 int lno
, const char *buf
) {
316 static void ccf_include(adns_state ads
, const char *fn
,
317 int lno
, const char *buf
) {
319 configparseerr(ads
,fn
,lno
,"`include' directive with no filename");
322 readconfig(ads
,buf
,1);
325 static void ccf_lookup(adns_state ads
, const char *fn
, int lno
,
332 configparseerr(ads
,fn
,lno
,"`lookup' directive with no databases");
336 while (nextword(&buf
,&word
,&l
)) {
337 if (l
==4 && !memcmp(word
,"bind",4)) {
339 } else if (l
==4 && !memcmp(word
,"file",4)) {
340 /* ignore this and hope /etc/hosts is not essential */
341 } else if (l
==2 && !memcmp(word
,"yp",2)) {
342 adns__diag(ads
,-1,0,"%s:%d: yp lookups not supported by adns", fn
,lno
);
345 adns__diag(ads
,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
351 adns__diag(ads
,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn
,lno
);
354 static const struct configcommandinfo
{
356 void (*fn
)(adns_state ads
, const char *fn
, int lno
, const char *buf
);
357 } configcommandinfos
[]= {
358 { "nameserver", ccf_nameserver
},
359 { "domain", ccf_search
},
360 { "search", ccf_search
},
361 { "sortlist", ccf_sortlist
},
362 { "options", ccf_options
},
363 { "clearnameservers", ccf_clearnss
},
364 { "include", ccf_include
},
365 { "lookup", ccf_lookup
}, /* OpenBSD */
374 static int gl_file(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
375 int lno
, char *buf
, int buflen
) {
376 FILE *file
= src_io
->file
;
384 for (;;) { /* loop over chars */
386 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
391 adns__diag(ads
,-1,0,"%s:%d: line contains nul, ignored",filename
,lno
);
393 } else if (c
== '\n') {
395 } else if (c
== EOF
) {
398 adns__diag(ads
,-1,0,"%s:%d: read error: %s",
399 filename
,lno
,strerror(errno
));
415 while ((c
= getc(file
)) != EOF
&& c
!= '\n');
419 static int gl_text(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
420 int lno
, char *buf
, int buflen
) {
421 const char *cp
= src_io
->text
;
424 if (!cp
|| !*cp
) return -1;
426 if (*cp
== ';' || *cp
== '\n') cp
++;
427 l
= strcspn(cp
,";\n");
431 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
441 static void readconfiggeneric(adns_state ads
, const char *filename
,
442 int (*getline
)(adns_state ads
, getline_ctx
*,
443 const char *filename
, int lno
,
444 char *buf
, int buflen
),
445 /* Returns >=0 for success, -1 for EOF or error
446 * (error will have been reported), or -2 for
447 * bad line was encountered, try again.
449 getline_ctx gl_ctx
) {
450 char linebuf
[2000], *p
, *q
;
452 const struct configcommandinfo
*ccip
;
455 (l
= getline(ads
,&gl_ctx
, filename
,lno
, linebuf
,sizeof(linebuf
))) != -1;
457 if (l
== -2) continue;
458 while (l
>0 && ctype_whitespace(linebuf
[l
-1])) l
--;
461 while (ctype_whitespace(*p
)) p
++;
462 if (*p
== '#' || *p
== ';' || !*p
) continue;
464 while (*q
&& !ctype_whitespace(*q
)) q
++;
466 for (ccip
=configcommandinfos
;
468 !(strlen(ccip
->name
)==dirl
&& !memcmp(ccip
->name
,p
,q
-p
));
471 adns__diag(ads
,-1,0,"%s:%d: unknown configuration directive `%.*s'",
472 filename
,lno
,(int)(q
-p
),p
);
475 while (ctype_whitespace(*q
)) q
++;
476 ccip
->fn(ads
,filename
,lno
,q
);
480 static const char *instrum_getenv(adns_state ads
, const char *envvar
) {
483 value
= getenv(envvar
);
484 if (!value
) adns__debug(ads
,-1,0,"environment variable %s not set",envvar
);
485 else adns__debug(ads
,-1,0,"environment variable %s"
486 " set to `%s'",envvar
,value
);
490 static void readconfig(adns_state ads
, const char *filename
, int warnmissing
) {
493 gl_ctx
.file
= fopen(filename
,"r");
495 if (errno
== ENOENT
) {
497 adns__debug(ads
,-1,0, "configuration file"
498 " `%s' does not exist",filename
);
502 adns__diag(ads
,-1,0,"cannot open configuration file `%s': %s",
503 filename
,strerror(errno
));
507 readconfiggeneric(ads
,filename
,gl_file
,gl_ctx
);
512 static void readconfigtext(adns_state ads
, const char *text
,
513 const char *showname
) {
517 readconfiggeneric(ads
,showname
,gl_text
,gl_ctx
);
520 static void readconfigenv(adns_state ads
, const char *envvar
) {
521 const char *filename
;
523 if (ads
->iflags
& adns_if_noenv
) {
524 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
527 filename
= instrum_getenv(ads
,envvar
);
528 if (filename
) readconfig(ads
,filename
,1);
531 static void readconfigenvtext(adns_state ads
, const char *envvar
) {
532 const char *textdata
;
534 if (ads
->iflags
& adns_if_noenv
) {
535 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
538 textdata
= instrum_getenv(ads
,envvar
);
539 if (textdata
) readconfigtext(ads
,textdata
,envvar
);
543 int adns__setnonblock(adns_state ads
, int fd
) {
546 r
= fcntl(fd
,F_GETFL
,0); if (r
<0) return errno
;
548 r
= fcntl(fd
,F_SETFL
,r
); if (r
<0) return errno
;
552 static int init_begin(adns_state
*ads_r
, adns_initflags flags
,
553 adns_logcallbackfn
*logfn
, void *logfndata
) {
557 ads
= malloc(sizeof(*ads
)); if (!ads
) return errno
;
561 ads
->logfndata
= logfndata
;
563 LIST_INIT(ads
->udpw
);
564 LIST_INIT(ads
->tcpw
);
565 LIST_INIT(ads
->childw
);
566 LIST_INIT(ads
->output
);
569 ads
->udpsocket
= ads
->tcpsocket
= -1;
570 adns__vbuf_init(&ads
->tcpsend
);
571 adns__vbuf_init(&ads
->tcprecv
);
572 ads
->tcprecv_skip
= 0;
573 ads
->nservers
= ads
->nsortlist
= ads
->nsearchlist
= ads
->tcpserver
= 0;
575 ads
->tcpstate
= server_disconnected
;
576 timerclear(&ads
->tcptimeout
);
580 ads
->rand48xsubi
[0]= pid
;
581 ads
->rand48xsubi
[1]= (unsigned long)pid
>> 16;
582 ads
->rand48xsubi
[2]= pid
^ ((unsigned long)pid
>> 16);
588 static int init_finish(adns_state ads
) {
589 struct sockaddr_in sin
;
590 struct protoent
*proto
;
593 if (!ads
->nservers
) {
594 if (ads
->logfn
&& ads
->iflags
& adns_if_debug
)
595 adns__lprintf(ads
,"adns: no nameservers, using IPv4 localhost\n");
596 memset(&sin
, 0, sizeof(sin
));
597 sin
.sin_family
= AF_INET
;
598 sin
.sin_port
= htons(DNS_PORT
);
599 sin
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
600 addserver(ads
,(struct sockaddr
*)&sin
, sizeof(sin
));
603 /* we can't cope with multiple transport address families yet */
604 for (i
=0; i
<ads
->nservers
; i
++)
605 assert(ads
->servers
[i
].addr
.sa
.sa_family
==AF_INET
);
607 proto
= getprotobyname("udp"); if (!proto
) { r
= ENOPROTOOPT
; goto x_free
; }
608 ads
->udpsocket
= socket(AF_INET
,SOCK_DGRAM
,proto
->p_proto
);
609 if (ads
->udpsocket
<0) { r
= errno
; goto x_free
; }
611 r
= adns__setnonblock(ads
,ads
->udpsocket
);
612 if (r
) { r
= errno
; goto x_closeudp
; }
617 close(ads
->udpsocket
);
623 static void init_abort(adns_state ads
) {
624 if (ads
->nsearchlist
) {
625 free(ads
->searchlist
[0]);
626 free(ads
->searchlist
);
631 static void logfn_file(adns_state ads
, void *logfndata
,
632 const char *fmt
, va_list al
) {
633 vfprintf(logfndata
,fmt
,al
);
636 static int init_files(adns_state
*ads_r
, adns_initflags flags
,
637 adns_logcallbackfn
*logfn
, void *logfndata
) {
639 const char *res_options
, *adns_res_options
;
642 r
= init_begin(&ads
, flags
, logfn
, logfndata
);
645 res_options
= instrum_getenv(ads
,"RES_OPTIONS");
646 adns_res_options
= instrum_getenv(ads
,"ADNS_RES_OPTIONS");
647 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
648 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
650 readconfig(ads
,"/etc/resolv.conf",1);
651 readconfig(ads
,"/etc/resolv-adns.conf",0);
652 readconfigenv(ads
,"RES_CONF");
653 readconfigenv(ads
,"ADNS_RES_CONF");
655 readconfigenvtext(ads
,"RES_CONF_TEXT");
656 readconfigenvtext(ads
,"ADNS_RES_CONF_TEXT");
658 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
659 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
661 ccf_search(ads
,"LOCALDOMAIN",-1,instrum_getenv(ads
,"LOCALDOMAIN"));
662 ccf_search(ads
,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads
,"ADNS_LOCALDOMAIN"));
664 if (ads
->configerrno
&& ads
->configerrno
!= EINVAL
) {
673 adns__consistency(ads
,0,cc_entex
);
678 int adns_init(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
679 return init_files(ads_r
, flags
, logfn_file
, diagfile ? diagfile
: stderr
);
682 static int init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
683 adns_logcallbackfn
*logfn
, void *logfndata
,
684 const char *configtext
) {
688 r
= init_begin(&ads
, flags
, logfn
, logfndata
);
691 readconfigtext(ads
,configtext
,"<supplied configuration text>");
692 if (ads
->configerrno
) {
698 r
= init_finish(ads
); if (r
) return r
;
699 adns__consistency(ads
,0,cc_entex
);
704 int adns_init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
705 FILE *diagfile
, const char *configtext
) {
706 return init_strcfg(ads_r
, flags
,
707 diagfile ? logfn_file
: 0, diagfile
,
711 int adns_init_logfn(adns_state
*newstate_r
, adns_initflags flags
,
712 const char *configtext
/*0=>use default config files*/,
713 adns_logcallbackfn
*logfn
/*0=>logfndata is a FILE* */,
714 void *logfndata
/*0 with logfn==0 => discard*/) {
715 if (!logfn
&& logfndata
)
718 return init_strcfg(newstate_r
, flags
, logfn
, logfndata
, configtext
);
720 return init_files(newstate_r
, flags
, logfn
, logfndata
);
723 void adns_finish(adns_state ads
) {
724 adns__consistency(ads
,0,cc_entex
);
726 if (ads
->udpw
.head
) adns_cancel(ads
->udpw
.head
);
727 else if (ads
->tcpw
.head
) adns_cancel(ads
->tcpw
.head
);
728 else if (ads
->childw
.head
) adns_cancel(ads
->childw
.head
);
729 else if (ads
->output
.head
) adns_cancel(ads
->output
.head
);
732 close(ads
->udpsocket
);
733 if (ads
->tcpsocket
>= 0) close(ads
->tcpsocket
);
734 adns__vbuf_free(&ads
->tcpsend
);
735 adns__vbuf_free(&ads
->tcprecv
);
740 void adns_forallqueries_begin(adns_state ads
) {
741 adns__consistency(ads
,0,cc_entex
);
743 ads
->udpw
.head ? ads
->udpw
.head
:
744 ads
->tcpw
.head ? ads
->tcpw
.head
:
745 ads
->childw
.head ? ads
->childw
.head
:
749 adns_query
adns_forallqueries_next(adns_state ads
, void **context_r
) {
752 adns__consistency(ads
,0,cc_entex
);
753 nqu
= ads
->forallnext
;
759 } else if (qu
== ads
->udpw
.tail
) {
761 ads
->tcpw
.head ? ads
->tcpw
.head
:
762 ads
->childw
.head ? ads
->childw
.head
:
764 } else if (qu
== ads
->tcpw
.tail
) {
766 ads
->childw
.head ? ads
->childw
.head
:
768 } else if (qu
== ads
->childw
.tail
) {
769 nqu
= ads
->output
.head
;
773 if (!qu
->parent
) break;
775 ads
->forallnext
= nqu
;
776 if (context_r
) *context_r
= qu
->ctx
.ext
;