3 * - configuration file parsing
4 * - management of global state
8 * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
10 * It is part of adns, which is
11 * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
12 * Copyright (C) 1999 Tony Finch <dot@dotat.at>
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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 in_addr addr
) {
48 for (i
=0; i
<ads
->nservers
; i
++) {
49 if (ads
->servers
[i
].addr
.s_addr
== addr
.s_addr
) {
50 adns__debug(ads
,-1,0,"duplicate nameserver %s ignored",inet_ntoa(addr
));
55 if (ads
->nservers
>=MAXSERVERS
) {
56 adns__diag(ads
,-1,0,"too many nameservers, ignoring %s",inet_ntoa(addr
));
60 ss
= ads
->servers
+ads
->nservers
;
65 static void freesearchlist(adns_state ads
) {
66 if (ads
->nsearchlist
) free(*ads
->searchlist
);
67 free(ads
->searchlist
);
70 static void saveerr(adns_state ads
, int en
) {
71 if (!ads
->configerrno
) ads
->configerrno
= en
;
74 static void configparseerr(adns_state ads
, const char *fn
, int lno
,
75 const char *fmt
, ...) {
79 if (!ads
->diagfile
|| (ads
->iflags
& adns_if_noerrprint
)) return;
81 if (lno
==-1) fprintf(ads
->diagfile
,"adns: %s: ",fn
);
82 else fprintf(ads
->diagfile
,"adns: %s:%d: ",fn
,lno
);
84 vfprintf(ads
->diagfile
,fmt
,al
);
86 fputc('\n',ads
->diagfile
);
89 static int nextword(const char **bufp_io
, const char **word_r
, int *l_r
) {
93 while (ctype_whitespace(*p
)) p
++;
97 while (*q
&& !ctype_whitespace(*q
)) q
++;
106 static void ccf_nameserver(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
109 if (!inet_aton(buf
,&ia
)) {
110 configparseerr(ads
,fn
,lno
,"invalid nameserver address `%s'",buf
);
113 adns__debug(ads
,-1,0,"using nameserver %s",inet_ntoa(ia
));
117 static void ccf_search(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
118 const char *bufp
, *word
;
119 char *newchars
, **newptrs
, **pp
;
127 while (nextword(&bufp
,&word
,&l
)) { count
++; tl
+= l
+1; }
129 newptrs
= malloc(sizeof(char*)*count
); if (!newptrs
) { saveerr(ads
,errno
); return; }
130 newchars
= malloc(tl
); if (!newchars
) { saveerr(ads
,errno
); free(newptrs
); return; }
134 while (nextword(&bufp
,&word
,&l
)) {
136 memcpy(newchars
,word
,l
);
142 ads
->nsearchlist
= count
;
143 ads
->searchlist
= newptrs
;
146 static void ccf_sortlist(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
148 char tbuf
[200], *slash
, *ep
;
149 struct in_addr base
, mask
;
151 unsigned long initial
, baselocal
;
156 while (nextword(&buf
,&word
,&l
)) {
157 if (ads
->nsortlist
>= MAXSORTLIST
) {
158 adns__diag(ads
,-1,0,"too many sortlist entries, ignoring %.*s onwards",l
,word
);
162 if (l
>= sizeof(tbuf
)) {
163 configparseerr(ads
,fn
,lno
,"sortlist entry `%.*s' too long",l
,word
);
167 memcpy(tbuf
,word
,l
); tbuf
[l
]= 0;
168 slash
= strchr(tbuf
,'/');
169 if (slash
) *slash
++= 0;
171 if (!inet_aton(tbuf
,&base
)) {
172 configparseerr(ads
,fn
,lno
,"invalid address `%s' in sortlist",tbuf
);
177 if (strchr(slash
,'.')) {
178 if (!inet_aton(slash
,&mask
)) {
179 configparseerr(ads
,fn
,lno
,"invalid mask `%s' in sortlist",slash
);
182 if (base
.s_addr
& ~mask
.s_addr
) {
183 configparseerr(ads
,fn
,lno
,
184 "mask `%s' in sortlist overlaps address `%s'",slash
,tbuf
);
188 initial
= strtoul(slash
,&ep
,10);
189 if (*ep
|| initial
>32) {
190 configparseerr(ads
,fn
,lno
,"mask length `%s' invalid",slash
);
193 mask
.s_addr
= htonl((0x0ffffffffUL
) << (32-initial
));
196 baselocal
= ntohl(base
.s_addr
);
197 if (!baselocal
& 0x080000000UL
) /* class A */
198 mask
.s_addr
= htonl(0x0ff000000UL
);
199 else if ((baselocal
& 0x0c0000000UL
) == 0x080000000UL
)
200 mask
.s_addr
= htonl(0x0ffff0000UL
); /* class B */
201 else if ((baselocal
& 0x0f0000000UL
) == 0x0e0000000UL
)
202 mask
.s_addr
= htonl(0x0ff000000UL
); /* class C */
204 configparseerr(ads
,fn
,lno
,
205 "network address `%s' in sortlist is not in classed ranges,"
206 " must specify mask explicitly", tbuf
);
211 ads
->sortlist
[ads
->nsortlist
].base
= base
;
212 ads
->sortlist
[ads
->nsortlist
].mask
= mask
;
217 static void ccf_options(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
225 while (nextword(&buf
,&word
,&l
)) {
226 if (l
==5 && !memcmp(word
,"debug",5)) {
227 ads
->iflags
|= adns_if_debug
;
230 if (l
>=6 && !memcmp(word
,"ndots:",6)) {
231 v
= strtoul(word
+6,&ep
,10);
232 if (l
==6 || ep
!= word
+l
|| v
> INT_MAX
) {
233 configparseerr(ads
,fn
,lno
,"option `%.*s' malformed or has bad value",l
,word
);
239 if (l
>=12 && !memcmp(word
,"adns_checkc:",12)) {
240 if (!strcmp(word
+12,"none")) {
241 ads
->iflags
&= ~adns_if_checkc_freq
;
242 ads
->iflags
|= adns_if_checkc_entex
;
243 } else if (!strcmp(word
+12,"entex")) {
244 ads
->iflags
&= ~adns_if_checkc_freq
;
245 ads
->iflags
|= adns_if_checkc_entex
;
246 } else if (!strcmp(word
+12,"freq")) {
247 ads
->iflags
|= adns_if_checkc_freq
;
249 configparseerr(ads
,fn
,lno
, "option adns_checkc has bad value `%s' "
250 "(must be none, entex or freq", word
+12);
254 adns__diag(ads
,-1,0,"%s:%d: unknown option `%.*s'", fn
,lno
, l
,word
);
258 static void ccf_clearnss(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
262 static void ccf_include(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
264 configparseerr(ads
,fn
,lno
,"`include' directive with no filename");
267 readconfig(ads
,buf
,1);
270 static const struct configcommandinfo
{
272 void (*fn
)(adns_state ads
, const char *fn
, int lno
, const char *buf
);
273 } configcommandinfos
[]= {
274 { "nameserver", ccf_nameserver
},
275 { "domain", ccf_search
},
276 { "search", ccf_search
},
277 { "sortlist", ccf_sortlist
},
278 { "options", ccf_options
},
279 { "clearnameservers", ccf_clearnss
},
280 { "include", ccf_include
},
289 static int gl_file(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
290 int lno
, char *buf
, int buflen
) {
291 FILE *file
= src_io
->file
;
299 for (;;) { /* loop over chars */
301 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
306 adns__diag(ads
,-1,0,"%s:%d: line contains nul, ignored",filename
,lno
);
308 } else if (c
== '\n') {
310 } else if (c
== EOF
) {
313 adns__diag(ads
,-1,0,"%s:%d: read error: %s",filename
,lno
,strerror(errno
));
329 while ((c
= getc(file
)) != EOF
&& c
!= '\n');
333 static int gl_text(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
334 int lno
, char *buf
, int buflen
) {
335 const char *cp
= src_io
->text
;
338 if (!cp
|| !*cp
) return -1;
340 if (*cp
== ';' || *cp
== '\n') cp
++;
341 l
= strcspn(cp
,";\n");
345 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
355 static void readconfiggeneric(adns_state ads
, const char *filename
,
356 int (*getline
)(adns_state ads
, getline_ctx
*,
357 const char *filename
, int lno
,
358 char *buf
, int buflen
),
359 /* Returns >=0 for success, -1 for EOF or error
360 * (error will have been reported), or -2 for
361 * bad line was encountered, try again.
363 getline_ctx gl_ctx
) {
364 char linebuf
[2000], *p
, *q
;
366 const struct configcommandinfo
*ccip
;
369 (l
= getline(ads
,&gl_ctx
, filename
,lno
, linebuf
,sizeof(linebuf
))) != -1;
371 if (l
== -2) continue;
372 while (l
>0 && ctype_whitespace(linebuf
[l
-1])) l
--;
375 while (ctype_whitespace(*p
)) p
++;
376 if (*p
== '#' || !*p
) continue;
378 while (*q
&& !ctype_whitespace(*q
)) q
++;
380 for (ccip
=configcommandinfos
;
381 ccip
->name
&& !(strlen(ccip
->name
)==dirl
&& !memcmp(ccip
->name
,p
,q
-p
));
384 adns__diag(ads
,-1,0,"%s:%d: unknown configuration directive `%.*s'",
388 while (ctype_whitespace(*q
)) q
++;
389 ccip
->fn(ads
,filename
,lno
,q
);
393 static const char *instrum_getenv(adns_state ads
, const char *envvar
) {
396 value
= getenv(envvar
);
397 if (!value
) adns__debug(ads
,-1,0,"environment variable %s not set",envvar
);
398 else adns__debug(ads
,-1,0,"environment variable %s set to `%s'",envvar
,value
);
402 static void readconfig(adns_state ads
, const char *filename
, int warnmissing
) {
405 gl_ctx
.file
= fopen(filename
,"r");
407 if (errno
== ENOENT
) {
409 adns__debug(ads
,-1,0,"configuration file `%s' does not exist",filename
);
413 adns__diag(ads
,-1,0,"cannot open configuration file `%s': %s",
414 filename
,strerror(errno
));
418 readconfiggeneric(ads
,filename
,gl_file
,gl_ctx
);
423 static void readconfigtext(adns_state ads
, const char *text
, const char *showname
) {
427 readconfiggeneric(ads
,showname
,gl_text
,gl_ctx
);
430 static void readconfigenv(adns_state ads
, const char *envvar
) {
431 const char *filename
;
433 if (ads
->iflags
& adns_if_noenv
) {
434 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
437 filename
= instrum_getenv(ads
,envvar
);
438 if (filename
) readconfig(ads
,filename
,1);
441 static void readconfigenvtext(adns_state ads
, const char *envvar
) {
442 const char *textdata
;
444 if (ads
->iflags
& adns_if_noenv
) {
445 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
448 textdata
= instrum_getenv(ads
,envvar
);
449 if (textdata
) readconfigtext(ads
,textdata
,envvar
);
453 int adns__setnonblock(adns_state ads
, int fd
) {
456 r
= fcntl(fd
,F_GETFL
,0); if (r
<0) return errno
;
458 r
= fcntl(fd
,F_SETFL
,r
); if (r
<0) return errno
;
462 static int init_begin(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
465 ads
= malloc(sizeof(*ads
)); if (!ads
) return errno
;
468 ads
->diagfile
= diagfile
;
470 LIST_INIT(ads
->udpw
);
471 LIST_INIT(ads
->tcpw
);
472 LIST_INIT(ads
->childw
);
473 LIST_INIT(ads
->output
);
476 ads
->udpsocket
= ads
->tcpsocket
= -1;
477 ads
->bug_if_query_done_now
= 0;
478 adns__vbuf_init(&ads
->tcpsend
);
479 adns__vbuf_init(&ads
->tcprecv
);
480 ads
->tcprecv_skip
= 0;
481 ads
->nservers
= ads
->nsortlist
= ads
->nsearchlist
= ads
->tcpserver
= 0;
483 ads
->tcpstate
= server_disconnected
;
484 timerclear(&ads
->tcptimeout
);
491 static int init_finish(adns_state ads
) {
493 struct protoent
*proto
;
496 if (!ads
->nservers
) {
497 if (ads
->diagfile
&& ads
->iflags
& adns_if_debug
)
498 fprintf(ads
->diagfile
,"adns: no nameservers, using localhost\n");
499 ia
.s_addr
= htonl(INADDR_LOOPBACK
);
503 proto
= getprotobyname("udp"); if (!proto
) { r
= ENOPROTOOPT
; goto x_free
; }
504 ads
->udpsocket
= socket(AF_INET
,SOCK_DGRAM
,proto
->p_proto
);
505 if (ads
->udpsocket
<0) { r
= errno
; goto x_free
; }
507 r
= adns__setnonblock(ads
,ads
->udpsocket
);
508 if (r
) { r
= errno
; goto x_closeudp
; }
513 close(ads
->udpsocket
);
519 static void init_abort(adns_state ads
) {
520 if (ads
->nsearchlist
) {
521 free(ads
->searchlist
[0]);
522 free(ads
->searchlist
);
527 int adns_init(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
529 const char *res_options
, *adns_res_options
;
532 r
= init_begin(&ads
, flags
, diagfile ? diagfile
: stderr
);
535 res_options
= instrum_getenv(ads
,"RES_OPTIONS");
536 adns_res_options
= instrum_getenv(ads
,"ADNS_RES_OPTIONS");
537 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
538 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
540 readconfig(ads
,"/etc/resolv.conf",1);
541 readconfig(ads
,"/etc/resolv-adns.conf",0);
542 readconfigenv(ads
,"RES_CONF");
543 readconfigenv(ads
,"ADNS_RES_CONF");
545 readconfigenvtext(ads
,"RES_CONF_TEXT");
546 readconfigenvtext(ads
,"ADNS_RES_CONF_TEXT");
548 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
549 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
551 ccf_search(ads
,"LOCALDOMAIN",-1,instrum_getenv(ads
,"LOCALDOMAIN"));
552 ccf_search(ads
,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads
,"ADNS_LOCALDOMAIN"));
554 if (ads
->configerrno
&& ads
->configerrno
!= EINVAL
) {
563 adns__consistency(ads
,0,cc_entex
);
568 int adns_init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
569 FILE *diagfile
, const char *configtext
) {
573 r
= init_begin(&ads
, flags
, diagfile
); if (r
) return r
;
575 readconfigtext(ads
,configtext
,"<supplied configuration text>");
576 if (ads
->configerrno
) {
582 r
= init_finish(ads
); if (r
) return r
;
583 adns__consistency(ads
,0,cc_entex
);
589 void adns_finish(adns_state ads
) {
590 adns__consistency(ads
,0,cc_entex
);
592 if (ads
->udpw
.head
) adns_cancel(ads
->udpw
.head
);
593 else if (ads
->tcpw
.head
) adns_cancel(ads
->tcpw
.head
);
594 else if (ads
->childw
.head
) adns_cancel(ads
->childw
.head
);
595 else if (ads
->output
.head
) adns_cancel(ads
->output
.head
);
598 close(ads
->udpsocket
);
599 if (ads
->tcpsocket
>= 0) close(ads
->tcpsocket
);
600 adns__vbuf_free(&ads
->tcpsend
);
601 adns__vbuf_free(&ads
->tcprecv
);
606 void adns_forallqueries_begin(adns_state ads
) {
607 adns__consistency(ads
,0,cc_entex
);
609 ads
->udpw
.head ? ads
->udpw
.head
:
610 ads
->tcpw
.head ? ads
->tcpw
.head
:
611 ads
->childw
.head ? ads
->childw
.head
:
615 adns_query
adns_forallqueries_next(adns_state ads
, void **context_r
) {
618 adns__consistency(ads
,0,cc_entex
);
619 nqu
= ads
->forallnext
;
625 } else if (qu
== ads
->udpw
.tail
) {
627 ads
->tcpw
.head ? ads
->tcpw
.head
:
628 ads
->childw
.head ? ads
->childw
.head
:
630 } else if (qu
== ads
->tcpw
.tail
) {
632 ads
->childw
.head ? ads
->childw
.head
:
634 } else if (qu
== ads
->childw
.tail
) {
635 nqu
= ads
->output
.head
;
639 if (!qu
->parent
) break;
641 ads
->forallnext
= nqu
;
642 if (context_r
) *context_r
= qu
->ctx
.ext
;