3 * - configuration file parsing
4 * - management of global state
7 * This file is part of adns, which is Copyright (C) 1997, 1998 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 <arpa/inet.h>
35 static void readconfig(adns_state ads
, const char *filename
);
37 static void addserver(adns_state ads
, struct in_addr addr
) {
41 for (i
=0; i
<ads
->nservers
; i
++) {
42 if (ads
->servers
[i
].addr
.s_addr
== addr
.s_addr
) {
43 adns__debug(ads
,-1,0,"duplicate nameserver %s ignored",inet_ntoa(addr
));
48 if (ads
->nservers
>=MAXSERVERS
) {
49 adns__diag(ads
,-1,0,"too many nameservers, ignoring %s",inet_ntoa(addr
));
53 ss
= ads
->servers
+ads
->nservers
;
58 static void saveerr(adns_state ads
, int en
) {
59 if (!ads
->configerrno
) ads
->configerrno
= en
;
62 static void configparseerr(adns_state ads
, const char *fn
, int lno
,
63 const char *fmt
, ...) {
67 if (!ads
->diagfile
|| (ads
->iflags
& adns_if_noerrprint
)) return;
69 if (lno
==-1) fprintf(ads
->diagfile
,"adns: %s: ",fn
);
70 else fprintf(ads
->diagfile
,"adns: %s:%d: ",fn
,lno
);
72 vfprintf(ads
->diagfile
,fmt
,al
);
74 fputc('\n',ads
->diagfile
);
77 static void ccf_nameserver(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
80 if (!inet_aton(buf
,&ia
)) {
81 configparseerr(ads
,fn
,lno
,"invalid nameserver address `%s'",buf
);
84 adns__debug(ads
,-1,0,"using nameserver %s",inet_ntoa(ia
));
88 static void ccf_search(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
90 adns__diag(ads
,-1,0,"warning - `search' ignored fixme");
93 static void ccf_sortlist(adns_state ads
, const char *fn
, int lno
, const char *bufp
) {
95 char tbuf
[200], *slash
, *ep
;
96 struct in_addr base
, mask
;
98 unsigned long initial
, baselocal
;
104 while (ctype_whitespace(*bufp
)) bufp
++;
108 while (*q
&& !ctype_whitespace(*q
)) q
++;
114 if (ads
->nsortlist
>= MAXSORTLIST
) {
115 adns__diag(ads
,-1,0,"too many sortlist entries, ignoring %.*s onwards",l
,p
);
119 if (l
>= sizeof(tbuf
)) {
120 configparseerr(ads
,fn
,lno
,"sortlist entry `%.*s' too long",l
,p
);
125 slash
= strchr(tbuf
,'/');
126 if (slash
) *slash
++= 0;
128 if (!inet_aton(tbuf
,&base
)) {
129 configparseerr(ads
,fn
,lno
,"invalid address `%s' in sortlist",tbuf
);
134 if (strchr(slash
,'.')) {
135 if (!inet_aton(slash
,&mask
)) {
136 configparseerr(ads
,fn
,lno
,"invalid mask `%s' in sortlist",slash
);
139 if (base
.s_addr
& ~mask
.s_addr
) {
140 configparseerr(ads
,fn
,lno
,
141 "mask `%s' in sortlist overlaps address `%s'",slash
,tbuf
);
145 initial
= strtoul(slash
,&ep
,10);
146 if (*ep
|| initial
>32) {
147 configparseerr(ads
,fn
,lno
,"mask length `%s' invalid",slash
);
150 mask
.s_addr
= htonl((0x0ffffffffUL
) << (32-initial
));
153 baselocal
= ntohl(base
.s_addr
);
154 if (!baselocal
& 0x080000000UL
) /* class A */
155 mask
.s_addr
= htonl(0x0ff000000UL
);
156 else if ((baselocal
& 0x0c0000000UL
) == 0x080000000UL
)
157 mask
.s_addr
= htonl(0x0ffff0000UL
); /* class B */
158 else if ((baselocal
& 0x0f0000000UL
) == 0x0e0000000UL
)
159 mask
.s_addr
= htonl(0x0ff000000UL
); /* class C */
161 configparseerr(ads
,fn
,lno
,
162 "network address `%s' in sortlist is not in classed ranges,"
163 " must specify mask explicitly", tbuf
);
168 ads
->sortlist
[ads
->nsortlist
].base
= base
;
169 ads
->sortlist
[ads
->nsortlist
].mask
= mask
;
174 static void ccf_options(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
176 adns__diag(ads
,-1,0,"warning - `options' ignored fixme");
179 static void ccf_clearnss(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
183 static void ccf_include(adns_state ads
, const char *fn
, int lno
, const char *buf
) {
185 configparseerr(ads
,fn
,lno
,"`include' directive with no filename");
191 static const struct configcommandinfo
{
193 void (*fn
)(adns_state ads
, const char *fn
, int lno
, const char *buf
);
194 } configcommandinfos
[]= {
195 { "nameserver", ccf_nameserver
},
196 { "domain", ccf_search
},
197 { "search", ccf_search
},
198 { "sortlist", ccf_sortlist
},
199 { "options", ccf_options
},
200 { "clearnameservers", ccf_clearnss
},
201 { "include", ccf_include
},
210 static int gl_file(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
211 int lno
, char *buf
, int buflen
) {
212 FILE *file
= src_io
->file
;
220 for (;;) { /* loop over chars */
222 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
227 adns__diag(ads
,-1,0,"%s:%d: line contains nul, ignored",filename
,lno
);
229 } else if (c
== '\n') {
231 } else if (c
== EOF
) {
234 adns__diag(ads
,-1,0,"%s:%d: read error: %s",filename
,lno
,strerror(errno
));
250 while ((c
= getc(file
)) != EOF
&& c
!= '\n');
254 static int gl_text(adns_state ads
, getline_ctx
*src_io
, const char *filename
,
255 int lno
, char *buf
, int buflen
) {
256 const char *cp
= src_io
->text
;
259 if (!cp
|| !*cp
) return -1;
261 if (*cp
== ';' || *cp
== '\n') cp
++;
262 l
= strcspn(cp
,";\n");
266 adns__diag(ads
,-1,0,"%s:%d: line too long, ignored",filename
,lno
);
276 static void readconfiggeneric(adns_state ads
, const char *filename
,
277 int (*getline
)(adns_state ads
, getline_ctx
*,
278 const char *filename
, int lno
,
279 char *buf
, int buflen
),
280 /* Returns >=0 for success, -1 for EOF or error
281 * (error will have been reported), or -2 for
282 * bad line was encountered, try again.
284 getline_ctx gl_ctx
) {
285 char linebuf
[2000], *p
, *q
;
287 const struct configcommandinfo
*ccip
;
290 (l
= getline(ads
,&gl_ctx
, filename
,lno
, linebuf
,sizeof(linebuf
))) != -1;
292 if (l
== -2) continue;
293 while (l
>0 && ctype_whitespace(linebuf
[l
-1])) l
--;
296 while (ctype_whitespace(*p
)) p
++;
297 if (*p
== '#' || !*p
) continue;
299 while (*q
&& !ctype_whitespace(*q
)) q
++;
301 for (ccip
=configcommandinfos
;
302 ccip
->name
&& !(strlen(ccip
->name
)==dirl
&& !memcmp(ccip
->name
,p
,q
-p
));
305 adns__diag(ads
,-1,0,"%s:%d: unknown configuration directive `%.*s'",
309 while (ctype_whitespace(*q
)) q
++;
310 ccip
->fn(ads
,filename
,lno
,q
);
314 static const char *instrum_getenv(adns_state ads
, const char *envvar
) {
317 value
= getenv(envvar
);
318 if (!value
) adns__debug(ads
,-1,0,"environment variable %s not set",envvar
);
319 else adns__debug(ads
,-1,0,"environment variable %s set to `%s'",envvar
,value
);
323 static void readconfig(adns_state ads
, const char *filename
) {
326 gl_ctx
.file
= fopen(filename
,"r");
328 if (errno
== ENOENT
) {
329 adns__debug(ads
,-1,0,"configuration file `%s' does not exist",filename
);
333 adns__diag(ads
,-1,0,"cannot open configuration file `%s': %s",
334 filename
,strerror(errno
));
338 readconfiggeneric(ads
,filename
,gl_file
,gl_ctx
);
343 static void readconfigtext(adns_state ads
, const char *text
, const char *showname
) {
347 readconfiggeneric(ads
,showname
,gl_text
,gl_ctx
);
350 static void readconfigenv(adns_state ads
, const char *envvar
) {
351 const char *filename
;
353 if (ads
->iflags
& adns_if_noenv
) {
354 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
357 filename
= instrum_getenv(ads
,envvar
);
358 if (filename
) readconfig(ads
,filename
);
361 static void readconfigenvtext(adns_state ads
, const char *envvar
) {
362 const char *textdata
;
364 if (ads
->iflags
& adns_if_noenv
) {
365 adns__debug(ads
,-1,0,"not checking environment variable `%s'",envvar
);
368 textdata
= instrum_getenv(ads
,envvar
);
369 if (textdata
) readconfigtext(ads
,textdata
,envvar
);
373 int adns__setnonblock(adns_state ads
, int fd
) {
376 r
= fcntl(fd
,F_GETFL
,0); if (r
<0) return errno
;
378 r
= fcntl(fd
,F_SETFL
,r
); if (r
<0) return errno
;
382 static int init_begin(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
385 ads
= malloc(sizeof(*ads
)); if (!ads
) return errno
;
388 ads
->diagfile
= diagfile
;
389 LIST_INIT(ads
->timew
);
390 LIST_INIT(ads
->childw
);
391 LIST_INIT(ads
->output
);
393 ads
->udpsocket
= ads
->tcpsocket
= -1;
394 adns__vbuf_init(&ads
->tcpsend
);
395 adns__vbuf_init(&ads
->tcprecv
);
396 ads
->nservers
= ads
->nsortlist
= ads
->tcpserver
= 0;
397 ads
->tcpstate
= server_disconnected
;
398 timerclear(&ads
->tcptimeout
);
404 static int init_finish(adns_state ads
) {
406 struct protoent
*proto
;
409 if (!ads
->nservers
) {
410 if (ads
->diagfile
&& ads
->iflags
& adns_if_debug
)
411 fprintf(ads
->diagfile
,"adns: no nameservers, using localhost\n");
412 ia
.s_addr
= htonl(INADDR_LOOPBACK
);
416 proto
= getprotobyname("udp"); if (!proto
) { r
= ENOPROTOOPT
; goto x_free
; }
417 ads
->udpsocket
= socket(AF_INET
,SOCK_DGRAM
,proto
->p_proto
);
418 if (ads
->udpsocket
<0) { r
= errno
; goto x_free
; }
420 r
= adns__setnonblock(ads
,ads
->udpsocket
);
421 if (r
) { r
= errno
; goto x_closeudp
; }
426 close(ads
->udpsocket
);
432 int adns_init(adns_state
*ads_r
, adns_initflags flags
, FILE *diagfile
) {
434 const char *res_options
, *adns_res_options
;
437 r
= init_begin(&ads
, flags
, diagfile ? diagfile
: stderr
);
440 res_options
= instrum_getenv(ads
,"RES_OPTIONS");
441 adns_res_options
= instrum_getenv(ads
,"ADNS_RES_OPTIONS");
442 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
443 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
445 readconfig(ads
,"/etc/resolv.conf");
446 readconfigenv(ads
,"RES_CONF");
447 readconfigenv(ads
,"ADNS_RES_CONF");
449 readconfigenvtext(ads
,"RES_CONF_TEXT");
450 readconfigenvtext(ads
,"ADNS_RES_CONF_TEXT");
452 ccf_options(ads
,"RES_OPTIONS",-1,res_options
);
453 ccf_options(ads
,"ADNS_RES_OPTIONS",-1,adns_res_options
);
455 ccf_search(ads
,"LOCALDOMAIN",-1,instrum_getenv(ads
,"LOCALDOMAIN"));
456 ccf_search(ads
,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads
,"ADNS_LOCALDOMAIN"));
465 int adns_init_strcfg(adns_state
*ads_r
, adns_initflags flags
,
466 FILE *diagfile
, const char *configtext
) {
470 r
= init_begin(&ads
, flags
, diagfile
); if (r
) return r
;
472 readconfigtext(ads
,configtext
,"<supplied configuration text>");
473 if (ads
->configerrno
) {
479 r
= init_finish(ads
); if (r
) return r
;
484 void adns_finish(adns_state ads
) {
486 if (ads
->timew
.head
) adns_cancel(ads
->timew
.head
);
487 else if (ads
->childw
.head
) adns_cancel(ads
->childw
.head
);
488 else if (ads
->output
.head
) adns_cancel(ads
->output
.head
);
491 close(ads
->udpsocket
);
492 if (ads
->tcpsocket
>= 0) close(ads
->tcpsocket
);
493 adns__vbuf_free(&ads
->tcpsend
);
494 adns__vbuf_free(&ads
->tcprecv
);