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 const struct sockaddr_in
*sin
;
49 assert(sa
->sa_family
==AF_INET
); assert(n
>=sizeof(*sin
));
50 sin
= (const void *)sa
;
52 for (i
=0; i
<ads
->nservers
; i
++) {
53 assert(ads
->servers
[i
].addr
.sa
.sa_family
==AF_INET
);
54 if (ads
->servers
[i
].addr
.inet
.sin_addr
.s_addr
== sin
->sin_addr
.s_addr
) {
55 adns__debug(ads
,-1,0,"duplicate nameserver %s ignored",
56 inet_ntoa(sin
->sin_addr
));
61 if (ads
->nservers
>=MAXSERVERS
) {
62 adns__diag(ads
,-1,0,"too many nameservers, ignoring %s",
63 inet_ntoa(sin
->sin_addr
));
67 ss
= ads
->servers
+ads
->nservers
;
68 assert(n
<= sizeof(ss
->addr
));
70 memcpy(&ss
->addr
, sa
, n
);
74 static void freesearchlist(adns_state ads
) {
75 if (ads
->nsearchlist
) free(*ads
->searchlist
);
76 free(ads
->searchlist
);
79 static void saveerr(adns_state ads
, int en
) {
80 if (!ads
->configerrno
) ads
->configerrno
= en
;
83 static void configparseerr(adns_state ads
, const char *fn
, int lno
,
84 const char *fmt
, ...) {
88 if (!ads
->logfn
|| (ads
->iflags
& adns_if_noerrprint
)) return;
90 if (lno
==-1) adns__lprintf(ads
,"adns: %s: ",fn
);
91 else adns__lprintf(ads
,"adns: %s:%d: ",fn
,lno
);
93 adns__vlprintf(ads
,fmt
,al
);
95 adns__lprintf(ads
,"\n");
98 static int nextword(const char **bufp_io
, const char **word_r
, int *l_r
) {
102 while (ctype_whitespace(*p
)) p
++;
106 while (*q
&& !ctype_whitespace(*q
)) q
++;
115 static void ccf_nameserver(adns_state ads
, const char *fn
,
116 int lno
, const char *buf
) {
117 struct sockaddr_in sin
;
119 memset(&sin
,0,sizeof(sin
));
120 sin
.sin_family
= AF_INET
;
121 sin
.sin_port
= htons(DNS_PORT
);
122 if (!inet_aton(buf
,&sin
.sin_addr
)) {
123 configparseerr(ads
,fn
,lno
,"invalid nameserver address `%s'",buf
);
126 adns__debug(ads
,-1,0,"using nameserver %s",inet_ntoa(sin
.sin_addr
));
127 addserver(ads
,(const struct sockaddr
*)&sin
,sizeof(sin
));
130 static void ccf_search(adns_state ads
, const char *fn
,
131 int lno
, const char *buf
) {
132 const char *bufp
, *word
;
133 char *newchars
, **newptrs
, **pp
;
141 while (nextword(&bufp
,&word
,&l
)) { count
++; tl
+= l
+1; }
143 newptrs
= malloc(sizeof(char*)*count
);
144 if (!newptrs
) { saveerr(ads
,errno
); return; }
146 newchars
= malloc(tl
);
147 if (!newchars
) { saveerr(ads
,errno
); free(newptrs
); return; }
151 while (nextword(&bufp
,&word
,&l
)) {
153 memcpy(newchars
,word
,l
);
159 ads
->nsearchlist
= count
;
160 ads
->searchlist
= newptrs
;
163 static void ccf_sortlist(adns_state ads
, const char *fn
,
164 int lno
, const char *buf
) {
166 char tbuf
[200], *slash
, *ep
;
167 const char *maskwhat
;
168 struct in_addr base
, mask
;
170 unsigned long initial
, baselocal
;
175 while (nextword(&buf
,&word
,&l
)) {
176 if (ads
->nsortlist
>= MAXSORTLIST
) {
177 adns__diag(ads
,-1,0,"too many sortlist entries,"
178 " ignoring %.*s onwards",l
,word
);
182 if (l
>= sizeof(tbuf
)) {
183 configparseerr(ads
,fn
,lno
,"sortlist entry `%.*s' too long",l
,word
);
187 memcpy(tbuf
,word
,l
); tbuf
[l
]= 0;
188 slash
= strchr(tbuf
,'/');
189 if (slash
) *slash
++= 0;
191 if (!inet_aton(tbuf
,&base
)) {
192 configparseerr(ads
,fn
,lno
,"invalid address `%s' in sortlist",tbuf
);
197 if (strchr(slash
,'.')) {
199 if (!inet_aton(slash
,&mask
)) {
200 configparseerr(ads
,fn
,lno
,"invalid mask `%s' in sortlist",slash
);
204 maskwhat
= "prefix length";
205 initial
= strtoul(slash
,&ep
,10);
206 if (*ep
|| initial
>32) {
207 configparseerr(ads
,fn
,lno
,"mask length `%s' invalid",slash
);
210 mask
.s_addr
= htonl((0x0ffffffffUL
) << (32-initial
));
213 maskwhat
= "implied mask";
214 baselocal
= ntohl(base
.s_addr
);
215 if (!(baselocal
& 0x080000000UL
)) /* class A */
216 mask
.s_addr
= htonl(0x0ff000000UL
);
217 else if ((baselocal
& 0x0c0000000UL
) == 0x080000000UL
)
218 mask
.s_addr
= htonl(0x0ffff0000UL
); /* class B */
219 else if ((baselocal
& 0x0f0000000UL
) == 0x0e0000000UL
)
220 mask
.s_addr
= htonl(0x0ff000000UL
); /* class C */
222 configparseerr(ads
,fn
,lno
, "network address `%s'"
223 " in sortlist is not in classed ranges,"
224 " must specify mask explicitly", tbuf
);
229 if (base
.s_addr
& ~mask
.s_addr
) {
230 configparseerr(ads
,fn
,lno
, "%s `%s' in sortlist"
231 " overlaps address `%s'",maskwhat
,
232 slash ? slash
: inet_ntoa(mask
), tbuf
);
236 ads
->sortlist
[ads
->nsortlist
].af
= AF_INET
;
237 ads
->sortlist
[ads
->nsortlist
].base
.v4
= base
;
238 ads
->sortlist
[ads
->nsortlist
].mask
.v4
= mask
;
243 static void ccf_options(adns_state ads
, const char *fn
,
244 int lno
, const char *buf
) {
252 while (nextword(&buf
,&word
,&l
)) {
253 if (l
==5 && !memcmp(word
,"debug",5)) {
254 ads
->iflags
|= adns_if_debug
;
257 if (l
>=6 && !memcmp(word
,"ndots:",6)) {
258 v
= strtoul(word
+6,&ep
,10);
259 if (l
==6 || ep
!= word
+l
|| v
> INT_MAX
) {
260 configparseerr(ads
,fn
,lno
,"option `%.*s' malformed"
261 " or has bad value",l
,word
);
267 if (l
>=12 && !memcmp(word
,"adns_checkc:",12)) {
268 if (!strcmp(word
+12,"none")) {
269 ads
->iflags
&= ~adns_if_checkc_freq
;
270 ads
->iflags
|= adns_if_checkc_entex
;
271 } else if (!strcmp(word
+12,"entex")) {
272 ads
->iflags
&= ~adns_if_checkc_freq
;
273 ads
->iflags
|= adns_if_checkc_entex
;
274 } else if (!strcmp(word
+12,"freq")) {
275 ads
->iflags
|= adns_if_checkc_freq
;
277 configparseerr(ads
,fn
,lno
, "option adns_checkc has bad value `%s' "
278 "(must be none, entex or freq", word
+12);
282 adns__diag(ads
,-1,0,"%s:%d: unknown option `%.*s'", fn
,lno
, l
,word
);
286 static void ccf_clearnss(adns_state ads
, const char *fn
,
287 int lno
, const char *buf
) {
291 static void ccf_include(adns_state ads
, const char *fn
,
292 int lno
, const char *buf
) {
294 configparseerr(ads
,fn
,lno
,"`include' directive with no filename");
297 readconfig(ads
,buf
,1);
300 static void ccf_lookup(adns_state ads
, const char *fn
, int lno
,
307 configparseerr(ads
,fn
,lno
,"`lookup' directive with no databases");
311 while (nextword(&buf
,&word
,&l
)) {
312 if (l
==4 && !memcmp(word
,"bind",4)) {
314 } else if (l
==4 && !memcmp(word
,"file",4)) {
315 /* ignore this and hope /etc/hosts is not essential */
316 } else if (l
==2 && !memcmp(word
,"yp",2)) {
317 adns__diag(ads
,-1,0,"%s:%d: yp lookups not supported by adns", fn
,lno
);
320 adns__diag(ads
,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
326 adns__diag(ads
,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn
,lno
);
329 static const struct configcommandinfo
{
331 void (*fn
)(adns_state ads
, const char *fn
, int lno
, const char *buf
);
332 } configcommandinfos
[]= {
333 { "nameserver", ccf_nameserver
},
334 { "domain", ccf_search
},
335 { "search", ccf_search
},
336 { "sortlist", ccf_sortlist
},
337 { "options", ccf_options
},
338 { "clearnameservers", ccf_clearnss
},
339 { "include", ccf_include
},
340 { "lookup", ccf_lookup
}, /* OpenBSD */
349 static int gl_file(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
350 int lno
, char *buf
, int buflen
) {
351 FILE *file
= src_io
->file
;
359 for (;;) { /* loop over chars */
361 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
366 adns__diag(ads
,-1,0,"%s:%d: line contains nul, ignored",filename
,lno
);
368 } else if (c
== '\n') {
370 } else if (c
== EOF
) {
373 adns__diag(ads
,-1,0,"%s:%d: read error: %s",
374 filename
,lno
,strerror(errno
));
390 while ((c
= getc(file
)) != EOF
&& c
!= '\n');
394 static int gl_text(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
395 int lno
, char *buf
, int buflen
) {
396 const char *cp
= src_io
->text
;
399 if (!cp
|| !*cp
) return -1;
401 if (*cp
== ';' || *cp
== '\n') cp
++;
402 l
= strcspn(cp
,";\n");
406 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
416 static void readconfiggeneric(adns_state ads
, const char *filename
,
417 int (*getline
)(adns_state ads
, getline_ctx
*,
418 const char *filename
, int lno
,
419 char *buf
, int buflen
),
420 /* Returns >=0 for success, -1 for EOF or error
421 * (error will have been reported), or -2 for
422 * bad line was encountered, try again.
424 getline_ctx gl_ctx
) {
425 char linebuf
[2000], *p
, *q
;
427 const struct configcommandinfo
*ccip
;
430 (l
= getline(ads
,&gl_ctx
, filename
,lno
, linebuf
,sizeof(linebuf
))) != -1;
432 if (l
== -2) continue;
433 while (l
>0 && ctype_whitespace(linebuf
[l
-1])) l
--;
436 while (ctype_whitespace(*p
)) p
++;
437 if (*p
== '#' || *p
== ';' || !*p
) continue;
439 while (*q
&& !ctype_whitespace(*q
)) q
++;
441 for (ccip
=configcommandinfos
;
443 !(strlen(ccip
->name
)==dirl
&& !memcmp(ccip
->name
,p
,q
-p
));
446 adns__diag(ads
,-1,0,"%s:%d: unknown configuration directive `%.*s'",
447 filename
,lno
,(int)(q
-p
),p
);
450 while (ctype_whitespace(*q
)) q
++;
451 ccip
->fn(ads
,filename
,lno
,q
);
455 static const char *instrum_getenv(adns_state ads
, const char *envvar
) {
458 value
= getenv(envvar
);
459 if (!value
) adns__debug(ads
,-1,0,"environment variable %s not set",envvar
);
460 else adns__debug(ads
,-1,0,"environment variable %s"
461 " set to `%s'",envvar
,value
);
465 static void readconfig(adns_state ads
, const char *filename
, int warnmissing
) {
468 gl_ctx
.file
= fopen(filename
,"r");
470 if (errno
== ENOENT
) {
472 adns__debug(ads
,-1,0, "configuration file"
473 " `%s' does not exist",filename
);
477 adns__diag(ads
,-1,0,"cannot open configuration file `%s': %s",
478 filename
,strerror(errno
));
482 readconfiggeneric(ads
,filename
,gl_file
,gl_ctx
);
487 static void readconfigtext(adns_state ads
, const char *text
,
488 const char *showname
) {
492 readconfiggeneric(ads
,showname
,gl_text
,gl_ctx
);
495 static void readconfigenv(adns_state ads
, const char *envvar
) {
496 const char *filename
;
498 if (ads
->iflags
& adns_if_noenv
) {
499 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
502 filename
= instrum_getenv(ads
,envvar
);
503 if (filename
) readconfig(ads
,filename
,1);
506 static void readconfigenvtext(adns_state ads
, const char *envvar
) {
507 const char *textdata
;
509 if (ads
->iflags
& adns_if_noenv
) {
510 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
513 textdata
= instrum_getenv(ads
,envvar
);
514 if (textdata
) readconfigtext(ads
,textdata
,envvar
);
518 int adns__setnonblock(adns_state ads
, int fd
) {
521 r
= fcntl(fd
,F_GETFL
,0); if (r
<0) return errno
;
523 r
= fcntl(fd
,F_SETFL
,r
); if (r
<0) return errno
;
527 static int init_begin(adns_state
*ads_r
, adns_initflags flags
,
528 adns_logcallbackfn
*logfn
, void *logfndata
) {
532 ads
= malloc(sizeof(*ads
)); if (!ads
) return errno
;
536 ads
->logfndata
= logfndata
;
538 LIST_INIT(ads
->udpw
);
539 LIST_INIT(ads
->tcpw
);
540 LIST_INIT(ads
->childw
);
541 LIST_INIT(ads
->output
);
544 ads
->udpsocket
= ads
->tcpsocket
= -1;
545 adns__vbuf_init(&ads
->tcpsend
);
546 adns__vbuf_init(&ads
->tcprecv
);
547 ads
->tcprecv_skip
= 0;
548 ads
->nservers
= ads
->nsortlist
= ads
->nsearchlist
= ads
->tcpserver
= 0;
550 ads
->tcpstate
= server_disconnected
;
551 timerclear(&ads
->tcptimeout
);
555 ads
->rand48xsubi
[0]= pid
;
556 ads
->rand48xsubi
[1]= (unsigned long)pid
>> 16;
557 ads
->rand48xsubi
[2]= pid
^ ((unsigned long)pid
>> 16);
563 static int init_finish(adns_state ads
) {
564 struct sockaddr_in sin
;
565 struct protoent
*proto
;
568 if (!ads
->nservers
) {
569 if (ads
->logfn
&& ads
->iflags
& adns_if_debug
)
570 adns__lprintf(ads
,"adns: no nameservers, using IPv4 localhost\n");
571 memset(&sin
, 0, sizeof(sin
));
572 sin
.sin_family
= AF_INET
;
573 sin
.sin_port
= htons(DNS_PORT
);
574 sin
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
575 addserver(ads
,(struct sockaddr
*)&sin
, sizeof(sin
));
578 /* we can't cope with multiple transport address families yet */
579 for (i
=0; i
<ads
->nservers
; i
++)
580 assert(ads
->servers
[i
].addr
.sa
.sa_family
==AF_INET
);
582 proto
= getprotobyname("udp"); if (!proto
) { r
= ENOPROTOOPT
; goto x_free
; }
583 ads
->udpsocket
= socket(AF_INET
,SOCK_DGRAM
,proto
->p_proto
);
584 if (ads
->udpsocket
<0) { r
= errno
; goto x_free
; }
586 r
= adns__setnonblock(ads
,ads
->udpsocket
);
587 if (r
) { r
= errno
; goto x_closeudp
; }
592 close(ads
->udpsocket
);
598 static void init_abort(adns_state ads
) {
599 if (ads
->nsearchlist
) {
600 free(ads
->searchlist
[0]);
601 free(ads
->searchlist
);
606 static void logfn_file(adns_state ads
, void *logfndata
,
607 const char *fmt
, va_list al
) {
608 vfprintf(logfndata
,fmt
,al
);
611 static int init_files(adns_state
*ads_r
, adns_initflags flags
,
612 adns_logcallbackfn
*logfn
, void *logfndata
) {
614 const char *res_options
, *adns_res_options
;
617 r
= init_begin(&ads
, flags
, logfn
, logfndata
);
620 res_options
= instrum_getenv(ads
,"RES_OPTIONS");
621 adns_res_options
= instrum_getenv(ads
,"ADNS_RES_OPTIONS");
622 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
623 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
625 readconfig(ads
,"/etc/resolv.conf",1);
626 readconfig(ads
,"/etc/resolv-adns.conf",0);
627 readconfigenv(ads
,"RES_CONF");
628 readconfigenv(ads
,"ADNS_RES_CONF");
630 readconfigenvtext(ads
,"RES_CONF_TEXT");
631 readconfigenvtext(ads
,"ADNS_RES_CONF_TEXT");
633 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
634 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
636 ccf_search(ads
,"LOCALDOMAIN",-1,instrum_getenv(ads
,"LOCALDOMAIN"));
637 ccf_search(ads
,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads
,"ADNS_LOCALDOMAIN"));
639 if (ads
->configerrno
&& ads
->configerrno
!= EINVAL
) {
648 adns__consistency(ads
,0,cc_entex
);
653 int adns_init(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
654 return init_files(ads_r
, flags
, logfn_file
, diagfile ? diagfile
: stderr
);
657 static int init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
658 adns_logcallbackfn
*logfn
, void *logfndata
,
659 const char *configtext
) {
663 r
= init_begin(&ads
, flags
, logfn
, logfndata
);
666 readconfigtext(ads
,configtext
,"<supplied configuration text>");
667 if (ads
->configerrno
) {
673 r
= init_finish(ads
); if (r
) return r
;
674 adns__consistency(ads
,0,cc_entex
);
679 int adns_init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
680 FILE *diagfile
, const char *configtext
) {
681 return init_strcfg(ads_r
, flags
,
682 diagfile ? logfn_file
: 0, diagfile
,
686 int adns_init_logfn(adns_state
*newstate_r
, adns_initflags flags
,
687 const char *configtext
/*0=>use default config files*/,
688 adns_logcallbackfn
*logfn
/*0=>logfndata is a FILE* */,
689 void *logfndata
/*0 with logfn==0 => discard*/) {
690 if (!logfn
&& logfndata
)
693 return init_strcfg(newstate_r
, flags
, logfn
, logfndata
, configtext
);
695 return init_files(newstate_r
, flags
, logfn
, logfndata
);
698 void adns_finish(adns_state ads
) {
699 adns__consistency(ads
,0,cc_entex
);
701 if (ads
->udpw
.head
) adns_cancel(ads
->udpw
.head
);
702 else if (ads
->tcpw
.head
) adns_cancel(ads
->tcpw
.head
);
703 else if (ads
->childw
.head
) adns_cancel(ads
->childw
.head
);
704 else if (ads
->output
.head
) adns_cancel(ads
->output
.head
);
707 close(ads
->udpsocket
);
708 if (ads
->tcpsocket
>= 0) close(ads
->tcpsocket
);
709 adns__vbuf_free(&ads
->tcpsend
);
710 adns__vbuf_free(&ads
->tcprecv
);
715 void adns_forallqueries_begin(adns_state ads
) {
716 adns__consistency(ads
,0,cc_entex
);
718 ads
->udpw
.head ? ads
->udpw
.head
:
719 ads
->tcpw
.head ? ads
->tcpw
.head
:
720 ads
->childw
.head ? ads
->childw
.head
:
724 adns_query
adns_forallqueries_next(adns_state ads
, void **context_r
) {
727 adns__consistency(ads
,0,cc_entex
);
728 nqu
= ads
->forallnext
;
734 } else if (qu
== ads
->udpw
.tail
) {
736 ads
->tcpw
.head ? ads
->tcpw
.head
:
737 ads
->childw
.head ? ads
->childw
.head
:
739 } else if (qu
== ads
->tcpw
.tail
) {
741 ads
->childw
.head ? ads
->childw
.head
:
743 } else if (qu
== ads
->childw
.tail
) {
744 nqu
= ads
->output
.head
;
748 if (!qu
->parent
) break;
750 ads
->forallnext
= nqu
;
751 if (context_r
) *context_r
= qu
->ctx
.ext
;