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
);
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 saveerr(adns_state ads
, int en
) {
66 if (!ads
->configerrno
) ads
->configerrno
= en
;
69 static void configparseerr(adns_state ads
, const char *fn
, int lno
,
70 const char *fmt
, ...) {
74 if (!ads
->diagfile
|| (ads
->iflags
& adns_if_noerrprint
)) return;
76 if (lno
==-1) fprintf(ads
->diagfile
,"adns: %s: ",fn
);
77 else fprintf(ads
->diagfile
,"adns: %s:%d: ",fn
,lno
);
79 vfprintf(ads
->diagfile
,fmt
,al
);
81 fputc('\n',ads
->diagfile
);
84 static int nextword(const char **bufp_io
, const char **word_r
, int *l_r
) {
88 while (ctype_whitespace(*p
)) p
++;
92 while (*q
&& !ctype_whitespace(*q
)) q
++;
101 static void ccf_nameserver(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
104 if (!inet_aton(buf
,&ia
)) {
105 configparseerr(ads
,fn
,lno
,"invalid nameserver address `%s'",buf
);
108 adns__debug(ads
,-1,0,"using nameserver %s",inet_ntoa(ia
));
112 static void ccf_search(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
113 const char *bufp
, *word
;
114 char *newchars
, **newptrs
, **pp
;
122 while (nextword(&bufp
,&word
,&l
)) { count
++; tl
+= l
+1; }
124 newptrs
= malloc(sizeof(char*)*count
); if (!newptrs
) { saveerr(ads
,errno
); return; }
125 newchars
= malloc(tl
); if (!newchars
) { saveerr(ads
,errno
); free(newptrs
); return; }
129 while (nextword(&bufp
,&word
,&l
)) {
131 memcpy(newchars
,word
,l
);
136 free(ads
->searchlist
);
137 ads
->nsearchlist
= count
;
138 ads
->searchlist
= newptrs
;
141 static void ccf_sortlist(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
143 char tbuf
[200], *slash
, *ep
;
144 struct in_addr base
, mask
;
146 unsigned long initial
, baselocal
;
151 while (nextword(&buf
,&word
,&l
)) {
152 if (ads
->nsortlist
>= MAXSORTLIST
) {
153 adns__diag(ads
,-1,0,"too many sortlist entries, ignoring %.*s onwards",l
,word
);
157 if (l
>= sizeof(tbuf
)) {
158 configparseerr(ads
,fn
,lno
,"sortlist entry `%.*s' too long",l
,word
);
162 memcpy(tbuf
,word
,l
); tbuf
[l
]= 0;
163 slash
= strchr(tbuf
,'/');
164 if (slash
) *slash
++= 0;
166 if (!inet_aton(tbuf
,&base
)) {
167 configparseerr(ads
,fn
,lno
,"invalid address `%s' in sortlist",tbuf
);
172 if (strchr(slash
,'.')) {
173 if (!inet_aton(slash
,&mask
)) {
174 configparseerr(ads
,fn
,lno
,"invalid mask `%s' in sortlist",slash
);
177 if (base
.s_addr
& ~mask
.s_addr
) {
178 configparseerr(ads
,fn
,lno
,
179 "mask `%s' in sortlist overlaps address `%s'",slash
,tbuf
);
183 initial
= strtoul(slash
,&ep
,10);
184 if (*ep
|| initial
>32) {
185 configparseerr(ads
,fn
,lno
,"mask length `%s' invalid",slash
);
188 mask
.s_addr
= htonl((0x0ffffffffUL
) << (32-initial
));
191 baselocal
= ntohl(base
.s_addr
);
192 if (!baselocal
& 0x080000000UL
) /* class A */
193 mask
.s_addr
= htonl(0x0ff000000UL
);
194 else if ((baselocal
& 0x0c0000000UL
) == 0x080000000UL
)
195 mask
.s_addr
= htonl(0x0ffff0000UL
); /* class B */
196 else if ((baselocal
& 0x0f0000000UL
) == 0x0e0000000UL
)
197 mask
.s_addr
= htonl(0x0ff000000UL
); /* class C */
199 configparseerr(ads
,fn
,lno
,
200 "network address `%s' in sortlist is not in classed ranges,"
201 " must specify mask explicitly", tbuf
);
206 ads
->sortlist
[ads
->nsortlist
].base
= base
;
207 ads
->sortlist
[ads
->nsortlist
].mask
= mask
;
212 static void ccf_options(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
220 while (nextword(&buf
,&word
,&l
)) {
221 if (l
==5 && !memcmp(word
,"debug",5)) {
222 ads
->iflags
|= adns_if_debug
;
225 if (l
>=6 && !memcmp(word
,"ndots:",6)) {
226 v
= strtoul(word
+6,&ep
,10);
227 if (l
==6 || ep
!= word
+l
|| v
> INT_MAX
) {
228 configparseerr(ads
,fn
,lno
,"option `%.*s' malformed or has bad value",l
,word
);
234 if (l
>=12 && !memcmp(word
,"adns_checkc:",12)) {
235 if (!strcmp(word
+12,"none")) {
236 ads
->iflags
&= ~adns_if_checkc_freq
;
237 ads
->iflags
|= adns_if_checkc_entex
;
238 } else if (!strcmp(word
+12,"entex")) {
239 ads
->iflags
&= ~adns_if_checkc_freq
;
240 ads
->iflags
|= adns_if_checkc_entex
;
241 } else if (!strcmp(word
+12,"freq")) {
242 ads
->iflags
|= adns_if_checkc_freq
;
244 configparseerr(ads
,fn
,lno
, "option adns_checkc has bad value `%s' "
245 "(must be none, entex or freq", word
+12);
249 adns__diag(ads
,-1,0,"%s:%d: unknown option `%.*s'", fn
,lno
, l
,word
);
253 static void ccf_clearnss(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
257 static void ccf_include(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
259 configparseerr(ads
,fn
,lno
,"`include' directive with no filename");
265 static const struct configcommandinfo
{
267 void (*fn
)(adns_state ads
, const char *fn
, int lno
, const char *buf
);
268 } configcommandinfos
[]= {
269 { "nameserver", ccf_nameserver
},
270 { "domain", ccf_search
},
271 { "search", ccf_search
},
272 { "sortlist", ccf_sortlist
},
273 { "options", ccf_options
},
274 { "clearnameservers", ccf_clearnss
},
275 { "include", ccf_include
},
284 static int gl_file(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
285 int lno
, char *buf
, int buflen
) {
286 FILE *file
= src_io
->file
;
294 for (;;) { /* loop over chars */
296 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
301 adns__diag(ads
,-1,0,"%s:%d: line contains nul, ignored",filename
,lno
);
303 } else if (c
== '\n') {
305 } else if (c
== EOF
) {
308 adns__diag(ads
,-1,0,"%s:%d: read error: %s",filename
,lno
,strerror(errno
));
324 while ((c
= getc(file
)) != EOF
&& c
!= '\n');
328 static int gl_text(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
329 int lno
, char *buf
, int buflen
) {
330 const char *cp
= src_io
->text
;
333 if (!cp
|| !*cp
) return -1;
335 if (*cp
== ';' || *cp
== '\n') cp
++;
336 l
= strcspn(cp
,";\n");
340 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
350 static void readconfiggeneric(adns_state ads
, const char *filename
,
351 int (*getline
)(adns_state ads
, getline_ctx
*,
352 const char *filename
, int lno
,
353 char *buf
, int buflen
),
354 /* Returns >=0 for success, -1 for EOF or error
355 * (error will have been reported), or -2 for
356 * bad line was encountered, try again.
358 getline_ctx gl_ctx
) {
359 char linebuf
[2000], *p
, *q
;
361 const struct configcommandinfo
*ccip
;
364 (l
= getline(ads
,&gl_ctx
, filename
,lno
, linebuf
,sizeof(linebuf
))) != -1;
366 if (l
== -2) continue;
367 while (l
>0 && ctype_whitespace(linebuf
[l
-1])) l
--;
370 while (ctype_whitespace(*p
)) p
++;
371 if (*p
== '#' || !*p
) continue;
373 while (*q
&& !ctype_whitespace(*q
)) q
++;
375 for (ccip
=configcommandinfos
;
376 ccip
->name
&& !(strlen(ccip
->name
)==dirl
&& !memcmp(ccip
->name
,p
,q
-p
));
379 adns__diag(ads
,-1,0,"%s:%d: unknown configuration directive `%.*s'",
383 while (ctype_whitespace(*q
)) q
++;
384 ccip
->fn(ads
,filename
,lno
,q
);
388 static const char *instrum_getenv(adns_state ads
, const char *envvar
) {
391 value
= getenv(envvar
);
392 if (!value
) adns__debug(ads
,-1,0,"environment variable %s not set",envvar
);
393 else adns__debug(ads
,-1,0,"environment variable %s set to `%s'",envvar
,value
);
397 static void readconfig(adns_state ads
, const char *filename
) {
400 gl_ctx
.file
= fopen(filename
,"r");
402 if (errno
== ENOENT
) {
403 adns__debug(ads
,-1,0,"configuration file `%s' does not exist",filename
);
407 adns__diag(ads
,-1,0,"cannot open configuration file `%s': %s",
408 filename
,strerror(errno
));
412 readconfiggeneric(ads
,filename
,gl_file
,gl_ctx
);
417 static void readconfigtext(adns_state ads
, const char *text
, const char *showname
) {
421 readconfiggeneric(ads
,showname
,gl_text
,gl_ctx
);
424 static void readconfigenv(adns_state ads
, const char *envvar
) {
425 const char *filename
;
427 if (ads
->iflags
& adns_if_noenv
) {
428 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
431 filename
= instrum_getenv(ads
,envvar
);
432 if (filename
) readconfig(ads
,filename
);
435 static void readconfigenvtext(adns_state ads
, const char *envvar
) {
436 const char *textdata
;
438 if (ads
->iflags
& adns_if_noenv
) {
439 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
442 textdata
= instrum_getenv(ads
,envvar
);
443 if (textdata
) readconfigtext(ads
,textdata
,envvar
);
447 int adns__setnonblock(adns_state ads
, int fd
) {
450 r
= fcntl(fd
,F_GETFL
,0); if (r
<0) return errno
;
452 r
= fcntl(fd
,F_SETFL
,r
); if (r
<0) return errno
;
456 static int init_begin(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
459 ads
= malloc(sizeof(*ads
)); if (!ads
) return errno
;
462 ads
->diagfile
= diagfile
;
464 LIST_INIT(ads
->udpw
);
465 LIST_INIT(ads
->tcpw
);
466 LIST_INIT(ads
->childw
);
467 LIST_INIT(ads
->output
);
470 ads
->udpsocket
= ads
->tcpsocket
= -1;
471 adns__vbuf_init(&ads
->tcpsend
);
472 adns__vbuf_init(&ads
->tcprecv
);
473 ads
->tcprecv_skip
= 0;
474 ads
->nservers
= ads
->nsortlist
= ads
->nsearchlist
= ads
->tcpserver
= 0;
476 ads
->tcpstate
= server_disconnected
;
477 timerclear(&ads
->tcptimeout
);
484 static int init_finish(adns_state ads
) {
486 struct protoent
*proto
;
489 if (!ads
->nservers
) {
490 if (ads
->diagfile
&& ads
->iflags
& adns_if_debug
)
491 fprintf(ads
->diagfile
,"adns: no nameservers, using localhost\n");
492 ia
.s_addr
= htonl(INADDR_LOOPBACK
);
496 proto
= getprotobyname("udp"); if (!proto
) { r
= ENOPROTOOPT
; goto x_free
; }
497 ads
->udpsocket
= socket(AF_INET
,SOCK_DGRAM
,proto
->p_proto
);
498 if (ads
->udpsocket
<0) { r
= errno
; goto x_free
; }
500 r
= adns__setnonblock(ads
,ads
->udpsocket
);
501 if (r
) { r
= errno
; goto x_closeudp
; }
506 close(ads
->udpsocket
);
512 static void init_abort(adns_state ads
) {
513 if (ads
->nsearchlist
) {
514 free(ads
->searchlist
[0]);
515 free(ads
->searchlist
);
520 int adns_init(adns_state
*ads_r
, int flags
, FILE *diagfile
) {
522 const char *res_options
, *adns_res_options
;
525 r
= init_begin(&ads
, flags
, diagfile ? diagfile
: stderr
);
528 res_options
= instrum_getenv(ads
,"RES_OPTIONS");
529 adns_res_options
= instrum_getenv(ads
,"ADNS_RES_OPTIONS");
530 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
531 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
533 readconfig(ads
,"/etc/resolv.conf");
534 readconfigenv(ads
,"RES_CONF");
535 readconfigenv(ads
,"ADNS_RES_CONF");
537 readconfigenvtext(ads
,"RES_CONF_TEXT");
538 readconfigenvtext(ads
,"ADNS_RES_CONF_TEXT");
540 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
541 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
543 ccf_search(ads
,"LOCALDOMAIN",-1,instrum_getenv(ads
,"LOCALDOMAIN"));
544 ccf_search(ads
,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads
,"ADNS_LOCALDOMAIN"));
546 if (ads
->configerrno
&& ads
->configerrno
!= EINVAL
) {
555 adns__consistency(ads
,0,cc_entex
);
560 int adns_init_strcfg(adns_state
*ads_r
, int flags
,
561 FILE *diagfile
, const char *configtext
) {
565 r
= init_begin(&ads
, flags
, diagfile
); if (r
) return r
;
567 readconfigtext(ads
,configtext
,"<supplied configuration text>");
568 if (ads
->configerrno
) {
574 r
= init_finish(ads
); if (r
) return r
;
575 adns__consistency(ads
,0,cc_entex
);
581 void adns_finish(adns_state ads
) {
582 adns__consistency(ads
,0,cc_entex
);
584 if (ads
->udpw
.head
) adns_cancel(ads
->udpw
.head
);
585 else if (ads
->tcpw
.head
) adns_cancel(ads
->tcpw
.head
);
586 else if (ads
->childw
.head
) adns_cancel(ads
->childw
.head
);
587 else if (ads
->output
.head
) adns_cancel(ads
->output
.head
);
590 close(ads
->udpsocket
);
591 if (ads
->tcpsocket
>= 0) close(ads
->tcpsocket
);
592 adns__vbuf_free(&ads
->tcpsend
);
593 adns__vbuf_free(&ads
->tcprecv
);
597 void adns_forallqueries_begin(adns_state ads
) {
598 adns__consistency(ads
,0,cc_entex
);
600 ads
->udpw
.head ? ads
->udpw
.head
:
601 ads
->tcpw
.head ? ads
->tcpw
.head
:
602 ads
->childw
.head ? ads
->childw
.head
:
606 adns_query
adns_forallqueries_next(adns_state ads
, void **context_r
) {
609 adns__consistency(ads
,0,cc_entex
);
610 nqu
= ads
->forallnext
;
616 } else if (qu
== ads
->udpw
.tail
) {
618 ads
->tcpw
.head ? ads
->tcpw
.head
:
619 ads
->childw
.head ? ads
->childw
.head
:
621 } else if (qu
== ads
->tcpw
.tail
) {
623 ads
->childw
.head ? ads
->childw
.head
:
625 } else if (qu
== ads
->childw
.tail
) {
626 nqu
= ads
->output
.head
;
630 if (!qu
->parent
) break;
632 ads
->forallnext
= nqu
;
633 if (context_r
) *context_r
= qu
->ctx
.ext
;