3 * - configuration file parsing
4 * - management of global state
7 * This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
31 #include <sys/socket.h>
32 #include <netinet/in.h>
33 #include <arpa/inet.h>
37 static void readconfig(adns_state ads
, const char *filename
);
39 static void addserver(adns_state ads
, struct in_addr addr
) {
43 for (i
=0; i
<ads
->nservers
; i
++) {
44 if (ads
->servers
[i
].addr
.s_addr
== addr
.s_addr
) {
45 adns__debug(ads
,-1,0,"duplicate nameserver %s ignored",inet_ntoa(addr
));
50 if (ads
->nservers
>=MAXSERVERS
) {
51 adns__diag(ads
,-1,0,"too many nameservers, ignoring %s",inet_ntoa(addr
));
55 ss
= ads
->servers
+ads
->nservers
;
60 static void saveerr(adns_state ads
, int en
) {
61 if (!ads
->configerrno
) ads
->configerrno
= en
;
64 static void configparseerr(adns_state ads
, const char *fn
, int lno
,
65 const char *fmt
, ...) {
69 if (!ads
->diagfile
|| (ads
->iflags
& adns_if_noerrprint
)) return;
71 if (lno
==-1) fprintf(ads
->diagfile
,"adns: %s: ",fn
);
72 else fprintf(ads
->diagfile
,"adns: %s:%d: ",fn
,lno
);
74 vfprintf(ads
->diagfile
,fmt
,al
);
76 fputc('\n',ads
->diagfile
);
79 static int nextword(const char **bufp_io
, const char **word_r
, int *l_r
) {
83 while (ctype_whitespace(*p
)) p
++;
87 while (*q
&& !ctype_whitespace(*q
)) q
++;
96 static void ccf_nameserver(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
99 if (!inet_aton(buf
,&ia
)) {
100 configparseerr(ads
,fn
,lno
,"invalid nameserver address `%s'",buf
);
103 adns__debug(ads
,-1,0,"using nameserver %s",inet_ntoa(ia
));
107 static void ccf_search(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
108 const char *bufp
, *word
;
109 char *newchars
, **newptrs
, **pp
;
117 while (nextword(&bufp
,&word
,&l
)) { count
++; tl
+= l
+1; }
119 newptrs
= malloc(sizeof(char*)*count
); if (!newptrs
) { saveerr(ads
,errno
); return; }
120 newchars
= malloc(tl
); if (!newchars
) { saveerr(ads
,errno
); free(newptrs
); return; }
124 while (nextword(&bufp
,&word
,&l
)) {
126 memcpy(newchars
,word
,l
);
131 free(ads
->searchlist
);
132 ads
->nsearchlist
= count
;
133 ads
->searchlist
= newptrs
;
136 static void ccf_sortlist(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
138 char tbuf
[200], *slash
, *ep
;
139 struct in_addr base
, mask
;
141 unsigned long initial
, baselocal
;
146 while (nextword(&buf
,&word
,&l
)) {
147 if (ads
->nsortlist
>= MAXSORTLIST
) {
148 adns__diag(ads
,-1,0,"too many sortlist entries, ignoring %.*s onwards",l
,word
);
152 if (l
>= sizeof(tbuf
)) {
153 configparseerr(ads
,fn
,lno
,"sortlist entry `%.*s' too long",l
,word
);
157 memcpy(tbuf
,word
,l
); tbuf
[l
]= 0;
158 slash
= strchr(tbuf
,'/');
159 if (slash
) *slash
++= 0;
161 if (!inet_aton(tbuf
,&base
)) {
162 configparseerr(ads
,fn
,lno
,"invalid address `%s' in sortlist",tbuf
);
167 if (strchr(slash
,'.')) {
168 if (!inet_aton(slash
,&mask
)) {
169 configparseerr(ads
,fn
,lno
,"invalid mask `%s' in sortlist",slash
);
172 if (base
.s_addr
& ~mask
.s_addr
) {
173 configparseerr(ads
,fn
,lno
,
174 "mask `%s' in sortlist overlaps address `%s'",slash
,tbuf
);
178 initial
= strtoul(slash
,&ep
,10);
179 if (*ep
|| initial
>32) {
180 configparseerr(ads
,fn
,lno
,"mask length `%s' invalid",slash
);
183 mask
.s_addr
= htonl((0x0ffffffffUL
) << (32-initial
));
186 baselocal
= ntohl(base
.s_addr
);
187 if (!baselocal
& 0x080000000UL
) /* class A */
188 mask
.s_addr
= htonl(0x0ff000000UL
);
189 else if ((baselocal
& 0x0c0000000UL
) == 0x080000000UL
)
190 mask
.s_addr
= htonl(0x0ffff0000UL
); /* class B */
191 else if ((baselocal
& 0x0f0000000UL
) == 0x0e0000000UL
)
192 mask
.s_addr
= htonl(0x0ff000000UL
); /* class C */
194 configparseerr(ads
,fn
,lno
,
195 "network address `%s' in sortlist is not in classed ranges,"
196 " must specify mask explicitly", tbuf
);
201 ads
->sortlist
[ads
->nsortlist
].base
= base
;
202 ads
->sortlist
[ads
->nsortlist
].mask
= mask
;
207 static void ccf_options(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
215 while (nextword(&buf
,&word
,&l
)) {
216 if (l
==5 && !memcmp(word
,"debug",5)) {
217 ads
->iflags
|= adns_if_debug
;
220 if (l
>=6 && !memcmp(word
,"ndots:",6)) {
221 v
= strtoul(word
+6,&ep
,10);
222 if (l
==6 || ep
!= word
+l
|| v
> INT_MAX
) {
223 configparseerr(ads
,fn
,lno
,"option `%.*s' malformed or has bad value",l
,word
);
229 adns__diag(ads
,-1,0,"%s:%d: unknown option `%.*s'", fn
,lno
, l
,word
);
233 static void ccf_clearnss(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
237 static void ccf_include(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
239 configparseerr(ads
,fn
,lno
,"`include' directive with no filename");
245 static const struct configcommandinfo
{
247 void (*fn
)(adns_state ads
, const char *fn
, int lno
, const char *buf
);
248 } configcommandinfos
[]= {
249 { "nameserver", ccf_nameserver
},
250 { "domain", ccf_search
},
251 { "search", ccf_search
},
252 { "sortlist", ccf_sortlist
},
253 { "options", ccf_options
},
254 { "clearnameservers", ccf_clearnss
},
255 { "include", ccf_include
},
264 static int gl_file(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
265 int lno
, char *buf
, int buflen
) {
266 FILE *file
= src_io
->file
;
274 for (;;) { /* loop over chars */
276 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
281 adns__diag(ads
,-1,0,"%s:%d: line contains nul, ignored",filename
,lno
);
283 } else if (c
== '\n') {
285 } else if (c
== EOF
) {
288 adns__diag(ads
,-1,0,"%s:%d: read error: %s",filename
,lno
,strerror(errno
));
304 while ((c
= getc(file
)) != EOF
&& c
!= '\n');
308 static int gl_text(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
309 int lno
, char *buf
, int buflen
) {
310 const char *cp
= src_io
->text
;
313 if (!cp
|| !*cp
) return -1;
315 if (*cp
== ';' || *cp
== '\n') cp
++;
316 l
= strcspn(cp
,";\n");
320 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
330 static void readconfiggeneric(adns_state ads
, const char *filename
,
331 int (*getline
)(adns_state ads
, getline_ctx
*,
332 const char *filename
, int lno
,
333 char *buf
, int buflen
),
334 /* Returns >=0 for success, -1 for EOF or error
335 * (error will have been reported), or -2 for
336 * bad line was encountered, try again.
338 getline_ctx gl_ctx
) {
339 char linebuf
[2000], *p
, *q
;
341 const struct configcommandinfo
*ccip
;
344 (l
= getline(ads
,&gl_ctx
, filename
,lno
, linebuf
,sizeof(linebuf
))) != -1;
346 if (l
== -2) continue;
347 while (l
>0 && ctype_whitespace(linebuf
[l
-1])) l
--;
350 while (ctype_whitespace(*p
)) p
++;
351 if (*p
== '#' || !*p
) continue;
353 while (*q
&& !ctype_whitespace(*q
)) q
++;
355 for (ccip
=configcommandinfos
;
356 ccip
->name
&& !(strlen(ccip
->name
)==dirl
&& !memcmp(ccip
->name
,p
,q
-p
));
359 adns__diag(ads
,-1,0,"%s:%d: unknown configuration directive `%.*s'",
363 while (ctype_whitespace(*q
)) q
++;
364 ccip
->fn(ads
,filename
,lno
,q
);
368 static const char *instrum_getenv(adns_state ads
, const char *envvar
) {
371 value
= getenv(envvar
);
372 if (!value
) adns__debug(ads
,-1,0,"environment variable %s not set",envvar
);
373 else adns__debug(ads
,-1,0,"environment variable %s set to `%s'",envvar
,value
);
377 static void readconfig(adns_state ads
, const char *filename
) {
380 gl_ctx
.file
= fopen(filename
,"r");
382 if (errno
== ENOENT
) {
383 adns__debug(ads
,-1,0,"configuration file `%s' does not exist",filename
);
387 adns__diag(ads
,-1,0,"cannot open configuration file `%s': %s",
388 filename
,strerror(errno
));
392 readconfiggeneric(ads
,filename
,gl_file
,gl_ctx
);
397 static void readconfigtext(adns_state ads
, const char *text
, const char *showname
) {
401 readconfiggeneric(ads
,showname
,gl_text
,gl_ctx
);
404 static void readconfigenv(adns_state ads
, const char *envvar
) {
405 const char *filename
;
407 if (ads
->iflags
& adns_if_noenv
) {
408 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
411 filename
= instrum_getenv(ads
,envvar
);
412 if (filename
) readconfig(ads
,filename
);
415 static void readconfigenvtext(adns_state ads
, const char *envvar
) {
416 const char *textdata
;
418 if (ads
->iflags
& adns_if_noenv
) {
419 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
422 textdata
= instrum_getenv(ads
,envvar
);
423 if (textdata
) readconfigtext(ads
,textdata
,envvar
);
427 int adns__setnonblock(adns_state ads
, int fd
) {
430 r
= fcntl(fd
,F_GETFL
,0); if (r
<0) return errno
;
432 r
= fcntl(fd
,F_SETFL
,r
); if (r
<0) return errno
;
436 static int init_begin(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
439 ads
= malloc(sizeof(*ads
)); if (!ads
) return errno
;
442 ads
->diagfile
= diagfile
;
444 LIST_INIT(ads
->timew
);
445 LIST_INIT(ads
->childw
);
446 LIST_INIT(ads
->output
);
449 ads
->udpsocket
= ads
->tcpsocket
= -1;
450 adns__vbuf_init(&ads
->tcpsend
);
451 adns__vbuf_init(&ads
->tcprecv
);
452 ads
->nservers
= ads
->nsortlist
= ads
->nsearchlist
= ads
->tcpserver
= 0;
454 ads
->tcpstate
= server_disconnected
;
455 timerclear(&ads
->tcptimeout
);
462 static int init_finish(adns_state ads
) {
464 struct protoent
*proto
;
467 if (!ads
->nservers
) {
468 if (ads
->diagfile
&& ads
->iflags
& adns_if_debug
)
469 fprintf(ads
->diagfile
,"adns: no nameservers, using localhost\n");
470 ia
.s_addr
= htonl(INADDR_LOOPBACK
);
474 proto
= getprotobyname("udp"); if (!proto
) { r
= ENOPROTOOPT
; goto x_free
; }
475 ads
->udpsocket
= socket(AF_INET
,SOCK_DGRAM
,proto
->p_proto
);
476 if (ads
->udpsocket
<0) { r
= errno
; goto x_free
; }
478 r
= adns__setnonblock(ads
,ads
->udpsocket
);
479 if (r
) { r
= errno
; goto x_closeudp
; }
484 close(ads
->udpsocket
);
490 static void init_abort(adns_state ads
) {
491 if (ads
->nsearchlist
) {
492 free(ads
->searchlist
[0]);
493 free(ads
->searchlist
);
498 int adns_init(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
500 const char *res_options
, *adns_res_options
;
503 r
= init_begin(&ads
, flags
, diagfile ? diagfile
: stderr
);
506 res_options
= instrum_getenv(ads
,"RES_OPTIONS");
507 adns_res_options
= instrum_getenv(ads
,"ADNS_RES_OPTIONS");
508 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
509 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
511 readconfig(ads
,"/etc/resolv.conf");
512 readconfigenv(ads
,"RES_CONF");
513 readconfigenv(ads
,"ADNS_RES_CONF");
515 readconfigenvtext(ads
,"RES_CONF_TEXT");
516 readconfigenvtext(ads
,"ADNS_RES_CONF_TEXT");
518 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
519 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
521 ccf_search(ads
,"LOCALDOMAIN",-1,instrum_getenv(ads
,"LOCALDOMAIN"));
522 ccf_search(ads
,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads
,"ADNS_LOCALDOMAIN"));
524 if (ads
->configerrno
&& ads
->configerrno
!= EINVAL
) {
537 int adns_init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
538 FILE *diagfile
, const char *configtext
) {
542 r
= init_begin(&ads
, flags
, diagfile
); if (r
) return r
;
544 readconfigtext(ads
,configtext
,"<supplied configuration text>");
545 if (ads
->configerrno
) {
551 r
= init_finish(ads
); if (r
) return r
;
556 void adns_finish(adns_state ads
) {
558 if (ads
->timew
.head
) adns_cancel(ads
->timew
.head
);
559 else if (ads
->childw
.head
) adns_cancel(ads
->childw
.head
);
560 else if (ads
->output
.head
) adns_cancel(ads
->output
.head
);
563 close(ads
->udpsocket
);
564 if (ads
->tcpsocket
>= 0) close(ads
->tcpsocket
);
565 adns__vbuf_free(&ads
->tcpsend
);
566 adns__vbuf_free(&ads
->tcprecv
);
570 void adns_forallqueries_begin(adns_state ads
) {
572 ads
->timew
.head ? ads
->timew
.head
:
573 ads
->childw
.head ? ads
->childw
.head
:
577 adns_query
adns_forallqueries_next(adns_state ads
, void **context_r
) {
580 nqu
= ads
->forallnext
;
586 } else if (qu
== ads
->timew
.tail
) {
587 if (ads
->childw
.head
) {
588 nqu
= ads
->childw
.head
;
590 nqu
= ads
->output
.head
;
592 } else if (qu
== ads
->childw
.tail
) {
593 nqu
= ads
->output
.head
;
597 if (!qu
->parent
) break;
599 ads
->forallnext
= nqu
;
600 if (context_r
) *context_r
= qu
->ctx
.ext
;
604 void adns__checkqueues(adns_state ads
) {
605 adns_forallqueries_begin(ads
);
606 while (adns_forallqueries_next(ads
,0));