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.
32 #include <arpa/inet.h>
36 static void readconfig(adns_state ads
, const char *filename
);
38 static void addserver(adns_state ads
, struct in_addr addr
) {
42 for (i
=0; i
<ads
->nservers
; i
++) {
43 if (ads
->servers
[i
].addr
.s_addr
== addr
.s_addr
) {
44 adns__debug(ads
,-1,0,"duplicate nameserver %s ignored",inet_ntoa(addr
));
49 if (ads
->nservers
>=MAXSERVERS
) {
50 adns__diag(ads
,-1,0,"too many nameservers, ignoring %s",inet_ntoa(addr
));
54 ss
= ads
->servers
+ads
->nservers
;
59 static void saveerr(adns_state ads
, int en
) {
60 if (!ads
->configerrno
) ads
->configerrno
= en
;
63 static void configparseerr(adns_state ads
, const char *fn
, int lno
,
64 const char *fmt
, ...) {
68 if (!ads
->diagfile
|| (ads
->iflags
& adns_if_noerrprint
)) return;
70 if (lno
==-1) fprintf(ads
->diagfile
,"adns: %s: ",fn
);
71 else fprintf(ads
->diagfile
,"adns: %s:%d: ",fn
,lno
);
73 vfprintf(ads
->diagfile
,fmt
,al
);
75 fputc('\n',ads
->diagfile
);
78 static int nextword(const char **bufp_io
, const char **word_r
, int *l_r
) {
82 while (ctype_whitespace(*p
)) p
++;
86 while (*q
&& !ctype_whitespace(*q
)) q
++;
95 static void ccf_nameserver(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
98 if (!inet_aton(buf
,&ia
)) {
99 configparseerr(ads
,fn
,lno
,"invalid nameserver address `%s'",buf
);
102 adns__debug(ads
,-1,0,"using nameserver %s",inet_ntoa(ia
));
106 static void ccf_search(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
107 const char *bufp
, *word
;
108 char *newchars
, **newptrs
, **pp
;
116 while (nextword(&bufp
,&word
,&l
)) { count
++; tl
+= l
+1; }
118 newptrs
= malloc(sizeof(char*)*count
); if (!newptrs
) { saveerr(ads
,errno
); return; }
119 newchars
= malloc(tl
); if (!newchars
) { saveerr(ads
,errno
); free(newptrs
); return; }
123 while (nextword(&bufp
,&word
,&l
)) {
125 memcpy(newchars
,word
,l
);
130 free(ads
->searchlist
);
131 ads
->nsearchlist
= count
;
132 ads
->searchlist
= newptrs
;
135 static void ccf_sortlist(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
137 char tbuf
[200], *slash
, *ep
;
138 struct in_addr base
, mask
;
140 unsigned long initial
, baselocal
;
145 while (nextword(&buf
,&word
,&l
)) {
146 if (ads
->nsortlist
>= MAXSORTLIST
) {
147 adns__diag(ads
,-1,0,"too many sortlist entries, ignoring %.*s onwards",l
,word
);
151 if (l
>= sizeof(tbuf
)) {
152 configparseerr(ads
,fn
,lno
,"sortlist entry `%.*s' too long",l
,word
);
156 memcpy(tbuf
,word
,l
); tbuf
[l
]= 0;
157 slash
= strchr(tbuf
,'/');
158 if (slash
) *slash
++= 0;
160 if (!inet_aton(tbuf
,&base
)) {
161 configparseerr(ads
,fn
,lno
,"invalid address `%s' in sortlist",tbuf
);
166 if (strchr(slash
,'.')) {
167 if (!inet_aton(slash
,&mask
)) {
168 configparseerr(ads
,fn
,lno
,"invalid mask `%s' in sortlist",slash
);
171 if (base
.s_addr
& ~mask
.s_addr
) {
172 configparseerr(ads
,fn
,lno
,
173 "mask `%s' in sortlist overlaps address `%s'",slash
,tbuf
);
177 initial
= strtoul(slash
,&ep
,10);
178 if (*ep
|| initial
>32) {
179 configparseerr(ads
,fn
,lno
,"mask length `%s' invalid",slash
);
182 mask
.s_addr
= htonl((0x0ffffffffUL
) << (32-initial
));
185 baselocal
= ntohl(base
.s_addr
);
186 if (!baselocal
& 0x080000000UL
) /* class A */
187 mask
.s_addr
= htonl(0x0ff000000UL
);
188 else if ((baselocal
& 0x0c0000000UL
) == 0x080000000UL
)
189 mask
.s_addr
= htonl(0x0ffff0000UL
); /* class B */
190 else if ((baselocal
& 0x0f0000000UL
) == 0x0e0000000UL
)
191 mask
.s_addr
= htonl(0x0ff000000UL
); /* class C */
193 configparseerr(ads
,fn
,lno
,
194 "network address `%s' in sortlist is not in classed ranges,"
195 " must specify mask explicitly", tbuf
);
200 ads
->sortlist
[ads
->nsortlist
].base
= base
;
201 ads
->sortlist
[ads
->nsortlist
].mask
= mask
;
206 static void ccf_options(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
214 while (nextword(&buf
,&word
,&l
)) {
215 if (l
==5 && !memcmp(word
,"debug",5)) {
216 ads
->iflags
|= adns_if_debug
;
219 if (l
>=6 && !memcmp(word
,"ndots:",6)) {
220 v
= strtoul(word
+6,&ep
,10);
221 if (l
==6 || ep
!= word
+l
|| v
> INT_MAX
) {
222 configparseerr(ads
,fn
,lno
,"option `%.*s' malformed or has bad value",l
,word
);
228 adns__diag(ads
,-1,0,"%s:%d: unknown option `%.*s'", fn
,lno
, l
,word
);
232 static void ccf_clearnss(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
236 static void ccf_include(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
238 configparseerr(ads
,fn
,lno
,"`include' directive with no filename");
244 static const struct configcommandinfo
{
246 void (*fn
)(adns_state ads
, const char *fn
, int lno
, const char *buf
);
247 } configcommandinfos
[]= {
248 { "nameserver", ccf_nameserver
},
249 { "domain", ccf_search
},
250 { "search", ccf_search
},
251 { "sortlist", ccf_sortlist
},
252 { "options", ccf_options
},
253 { "clearnameservers", ccf_clearnss
},
254 { "include", ccf_include
},
263 static int gl_file(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
264 int lno
, char *buf
, int buflen
) {
265 FILE *file
= src_io
->file
;
273 for (;;) { /* loop over chars */
275 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
280 adns__diag(ads
,-1,0,"%s:%d: line contains nul, ignored",filename
,lno
);
282 } else if (c
== '\n') {
284 } else if (c
== EOF
) {
287 adns__diag(ads
,-1,0,"%s:%d: read error: %s",filename
,lno
,strerror(errno
));
303 while ((c
= getc(file
)) != EOF
&& c
!= '\n');
307 static int gl_text(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
308 int lno
, char *buf
, int buflen
) {
309 const char *cp
= src_io
->text
;
312 if (!cp
|| !*cp
) return -1;
314 if (*cp
== ';' || *cp
== '\n') cp
++;
315 l
= strcspn(cp
,";\n");
319 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
329 static void readconfiggeneric(adns_state ads
, const char *filename
,
330 int (*getline
)(adns_state ads
, getline_ctx
*,
331 const char *filename
, int lno
,
332 char *buf
, int buflen
),
333 /* Returns >=0 for success, -1 for EOF or error
334 * (error will have been reported), or -2 for
335 * bad line was encountered, try again.
337 getline_ctx gl_ctx
) {
338 char linebuf
[2000], *p
, *q
;
340 const struct configcommandinfo
*ccip
;
343 (l
= getline(ads
,&gl_ctx
, filename
,lno
, linebuf
,sizeof(linebuf
))) != -1;
345 if (l
== -2) continue;
346 while (l
>0 && ctype_whitespace(linebuf
[l
-1])) l
--;
349 while (ctype_whitespace(*p
)) p
++;
350 if (*p
== '#' || !*p
) continue;
352 while (*q
&& !ctype_whitespace(*q
)) q
++;
354 for (ccip
=configcommandinfos
;
355 ccip
->name
&& !(strlen(ccip
->name
)==dirl
&& !memcmp(ccip
->name
,p
,q
-p
));
358 adns__diag(ads
,-1,0,"%s:%d: unknown configuration directive `%.*s'",
362 while (ctype_whitespace(*q
)) q
++;
363 ccip
->fn(ads
,filename
,lno
,q
);
367 static const char *instrum_getenv(adns_state ads
, const char *envvar
) {
370 value
= getenv(envvar
);
371 if (!value
) adns__debug(ads
,-1,0,"environment variable %s not set",envvar
);
372 else adns__debug(ads
,-1,0,"environment variable %s set to `%s'",envvar
,value
);
376 static void readconfig(adns_state ads
, const char *filename
) {
379 gl_ctx
.file
= fopen(filename
,"r");
381 if (errno
== ENOENT
) {
382 adns__debug(ads
,-1,0,"configuration file `%s' does not exist",filename
);
386 adns__diag(ads
,-1,0,"cannot open configuration file `%s': %s",
387 filename
,strerror(errno
));
391 readconfiggeneric(ads
,filename
,gl_file
,gl_ctx
);
396 static void readconfigtext(adns_state ads
, const char *text
, const char *showname
) {
400 readconfiggeneric(ads
,showname
,gl_text
,gl_ctx
);
403 static void readconfigenv(adns_state ads
, const char *envvar
) {
404 const char *filename
;
406 if (ads
->iflags
& adns_if_noenv
) {
407 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
410 filename
= instrum_getenv(ads
,envvar
);
411 if (filename
) readconfig(ads
,filename
);
414 static void readconfigenvtext(adns_state ads
, const char *envvar
) {
415 const char *textdata
;
417 if (ads
->iflags
& adns_if_noenv
) {
418 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
421 textdata
= instrum_getenv(ads
,envvar
);
422 if (textdata
) readconfigtext(ads
,textdata
,envvar
);
426 int adns__setnonblock(adns_state ads
, int fd
) {
429 r
= fcntl(fd
,F_GETFL
,0); if (r
<0) return errno
;
431 r
= fcntl(fd
,F_SETFL
,r
); if (r
<0) return errno
;
435 static int init_begin(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
438 ads
= malloc(sizeof(*ads
)); if (!ads
) return errno
;
441 ads
->diagfile
= diagfile
;
442 LIST_INIT(ads
->timew
);
443 LIST_INIT(ads
->childw
);
444 LIST_INIT(ads
->output
);
446 ads
->udpsocket
= ads
->tcpsocket
= -1;
447 adns__vbuf_init(&ads
->tcpsend
);
448 adns__vbuf_init(&ads
->tcprecv
);
449 ads
->nservers
= ads
->nsortlist
= ads
->nsearchlist
= ads
->tcpserver
= 0;
450 ads
->tcpstate
= server_disconnected
;
453 timerclear(&ads
->tcptimeout
);
459 static int init_finish(adns_state ads
) {
461 struct protoent
*proto
;
464 if (!ads
->nservers
) {
465 if (ads
->diagfile
&& ads
->iflags
& adns_if_debug
)
466 fprintf(ads
->diagfile
,"adns: no nameservers, using localhost\n");
467 ia
.s_addr
= htonl(INADDR_LOOPBACK
);
471 proto
= getprotobyname("udp"); if (!proto
) { r
= ENOPROTOOPT
; goto x_free
; }
472 ads
->udpsocket
= socket(AF_INET
,SOCK_DGRAM
,proto
->p_proto
);
473 if (ads
->udpsocket
<0) { r
= errno
; goto x_free
; }
475 r
= adns__setnonblock(ads
,ads
->udpsocket
);
476 if (r
) { r
= errno
; goto x_closeudp
; }
481 close(ads
->udpsocket
);
487 static void init_abort(adns_state ads
) {
488 if (ads
->nsearchlist
) {
489 free(ads
->searchlist
[0]);
490 free(ads
->searchlist
);
495 int adns_init(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
497 const char *res_options
, *adns_res_options
;
500 r
= init_begin(&ads
, flags
, diagfile ? diagfile
: stderr
);
503 res_options
= instrum_getenv(ads
,"RES_OPTIONS");
504 adns_res_options
= instrum_getenv(ads
,"ADNS_RES_OPTIONS");
505 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
506 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
508 readconfig(ads
,"/etc/resolv.conf");
509 readconfigenv(ads
,"RES_CONF");
510 readconfigenv(ads
,"ADNS_RES_CONF");
512 readconfigenvtext(ads
,"RES_CONF_TEXT");
513 readconfigenvtext(ads
,"ADNS_RES_CONF_TEXT");
515 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
516 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
518 ccf_search(ads
,"LOCALDOMAIN",-1,instrum_getenv(ads
,"LOCALDOMAIN"));
519 ccf_search(ads
,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads
,"ADNS_LOCALDOMAIN"));
521 if (ads
->configerrno
&& ads
->configerrno
!= EINVAL
) {
534 int adns_init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
535 FILE *diagfile
, const char *configtext
) {
539 r
= init_begin(&ads
, flags
, diagfile
); if (r
) return r
;
541 readconfigtext(ads
,configtext
,"<supplied configuration text>");
542 if (ads
->configerrno
) {
548 r
= init_finish(ads
); if (r
) return r
;
553 void adns_finish(adns_state ads
) {
555 if (ads
->timew
.head
) adns_cancel(ads
->timew
.head
);
556 else if (ads
->childw
.head
) adns_cancel(ads
->childw
.head
);
557 else if (ads
->output
.head
) adns_cancel(ads
->output
.head
);
560 close(ads
->udpsocket
);
561 if (ads
->tcpsocket
>= 0) close(ads
->tcpsocket
);
562 adns__vbuf_free(&ads
->tcpsend
);
563 adns__vbuf_free(&ads
->tcprecv
);