3 * - configuration file parsing
4 * - management of global state
7 * This file is part of adns, which is
8 * Copyright (C) 1997-2000,2003,2006 Ian Jackson
9 * Copyright (C) 1999-2000,2003,2006 Tony Finch
10 * Copyright (C) 1991 Massachusetts Institute of Technology
11 * (See the file INSTALL for full details.)
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2, or (at your option)
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software Foundation,
25 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
34 #include <sys/types.h>
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->logfn || (ads->iflags & adns_if_noerrprint)) return;
81 if (lno==-1) adns__lprintf(ads,"adns: %s: ",fn);
82 else adns__lprintf(ads,"adns: %s:%d: ",fn,lno);
84 adns__vlprintf(ads,fmt,al);
86 adns__lprintf(ads,"\n");
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,
107 int lno, const char *buf) {
110 if (!inet_aton(buf,&ia)) {
111 configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf);
114 adns__debug(ads,-1,0,"using nameserver %s",inet_ntoa(ia));
118 static void ccf_search(adns_state ads, const char *fn,
119 int lno, const char *buf) {
120 const char *bufp, *word;
121 char *newchars, **newptrs, **pp;
129 while (nextword(&bufp,&word,&l)) { count++; tl += l+1; }
131 newptrs= malloc(sizeof(char*)*count);
132 if (!newptrs) { saveerr(ads,errno); return; }
134 newchars= malloc(tl);
135 if (!newchars) { saveerr(ads,errno); free(newptrs); return; }
139 while (nextword(&bufp,&word,&l)) {
141 memcpy(newchars,word,l);
147 ads->nsearchlist= count;
148 ads->searchlist= newptrs;
151 static void ccf_sortlist(adns_state ads, const char *fn,
152 int lno, const char *buf) {
154 char tbuf[200], *slash, *ep;
155 const char *maskwhat;
164 while (nextword(&buf,&word,&l)) {
165 if (ads->nsortlist >= MAXSORTLIST) {
166 adns__diag(ads,-1,0,"too many sortlist entries,"
167 " ignoring %.*s onwards",l,word);
171 if (l >= sizeof(tbuf)) {
172 configparseerr(ads,fn,lno,"sortlist entry `%.*s' too long",l,word);
176 memcpy(tbuf,word,l); tbuf[l]= 0;
177 slash= strchr(tbuf,'/');
178 if (slash) *slash++= 0;
180 sl= &ads->sortlist[ads->nsortlist];
182 if (strchr(tbuf, ':'))
183 ai= &adns__inet6_afinfo;
185 ai= &adns__inet_afinfo;
187 if (!inet_pton(ai->af, tbuf, &sl->base)) {
188 configparseerr(ads,fn,lno,"invalid address `%s' in sortlist",tbuf);
193 if (strchr(slash,ai->delim)) {
195 if (!inet_pton(ai->af,slash,&sl->mask)) {
196 configparseerr(ads,fn,lno,"invalid mask `%s' in sortlist",slash);
200 maskwhat = "prefix length";
201 initial= strtoul(slash,&ep,10);
202 if (*ep || initial>ai->width) {
203 configparseerr(ads,fn,lno,"mask length `%s' invalid",slash);
206 ai->prefix_mask(initial, &sl->mask);
209 maskwhat = "implied prefix length";
210 initial = ai->guess_len(&sl->base);
212 configparseerr(ads,fn,lno, "network address `%s'"
213 " in sortlist is not in classed ranges,"
214 " must specify mask explicitly", tbuf);
217 ai->prefix_mask(initial, &sl->mask);
220 if (!ai->matchp(&sl->base, &sl->base, &sl->mask)) {
222 configparseerr(ads,fn,lno, "%s %d in sortlist"
223 " overlaps address `%s'",maskwhat,initial,tbuf);
225 configparseerr(ads,fn,lno, "%s `%s' in sortlist"
226 " overlaps address `%s'",maskwhat,slash,tbuf);
236 static void ccf_options(adns_state ads, const char *fn,
237 int lno, const char *buf) {
245 while (nextword(&buf,&word,&l)) {
246 if (l==5 && !memcmp(word,"debug",5)) {
247 ads->iflags |= adns_if_debug;
250 if (l>=6 && !memcmp(word,"ndots:",6)) {
251 v= strtoul(word+6,&ep,10);
252 if (l==6 || ep != word+l || v > INT_MAX) {
253 configparseerr(ads,fn,lno,"option `%.*s' malformed"
254 " or has bad value",l,word);
260 if (l>=12 && !memcmp(word,"adns_checkc:",12)) {
261 if (!strcmp(word+12,"none")) {
262 ads->iflags &= ~adns_if_checkc_freq;
263 ads->iflags |= adns_if_checkc_entex;
264 } else if (!strcmp(word+12,"entex")) {
265 ads->iflags &= ~adns_if_checkc_freq;
266 ads->iflags |= adns_if_checkc_entex;
267 } else if (!strcmp(word+12,"freq")) {
268 ads->iflags |= adns_if_checkc_freq;
270 configparseerr(ads,fn,lno, "option adns_checkc has bad value `%s' "
271 "(must be none, entex or freq", word+12);
275 adns__diag(ads,-1,0,"%s:%d: unknown option `%.*s'", fn,lno, l,word);
279 static void ccf_clearnss(adns_state ads, const char *fn,
280 int lno, const char *buf) {
284 static void ccf_include(adns_state ads, const char *fn,
285 int lno, const char *buf) {
287 configparseerr(ads,fn,lno,"`include' directive with no filename");
290 readconfig(ads,buf,1);
293 static void ccf_lookup(adns_state ads, const char *fn, int lno,
300 configparseerr(ads,fn,lno,"`lookup' directive with no databases");
304 while (nextword(&buf,&word,&l)) {
305 if (l==4 && !memcmp(word,"bind",4)) {
307 } else if (l==4 && !memcmp(word,"file",4)) {
308 /* ignore this and hope /etc/hosts is not essential */
309 } else if (l==2 && !memcmp(word,"yp",2)) {
310 adns__diag(ads,-1,0,"%s:%d: yp lookups not supported by adns", fn,lno);
313 adns__diag(ads,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
319 adns__diag(ads,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn,lno);
322 static const struct configcommandinfo {
324 void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
325 } configcommandinfos[]= {
326 { "nameserver", ccf_nameserver },
327 { "domain", ccf_search },
328 { "search", ccf_search },
329 { "sortlist", ccf_sortlist },
330 { "options", ccf_options },
331 { "clearnameservers", ccf_clearnss },
332 { "include", ccf_include },
333 { "lookup", ccf_lookup }, /* OpenBSD */
342 static int gl_file(adns_state ads, getline_ctx *src_io, const char *filename,
343 int lno, char *buf, int buflen) {
344 FILE *file= src_io->file;
352 for (;;) { /* loop over chars */
354 adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
359 adns__diag(ads,-1,0,"%s:%d: line contains nul, ignored",filename,lno);
361 } else if (c == '\n') {
363 } else if (c == EOF) {
366 adns__diag(ads,-1,0,"%s:%d: read error: %s",
367 filename,lno,strerror(errno));
383 while ((c= getc(file)) != EOF && c != '\n');
387 static int gl_text(adns_state ads, getline_ctx *src_io, const char *filename,
388 int lno, char *buf, int buflen) {
389 const char *cp= src_io->text;
392 if (!cp || !*cp) return -1;
394 if (*cp == ';' || *cp == '\n') cp++;
395 l= strcspn(cp,";\n");
399 adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
409 static void readconfiggeneric(adns_state ads, const char *filename,
410 int (*getline)(adns_state ads, getline_ctx*,
411 const char *filename, int lno,
412 char *buf, int buflen),
413 /* Returns >=0 for success, -1 for EOF or error
414 * (error will have been reported), or -2 for
415 * bad line was encountered, try again.
417 getline_ctx gl_ctx) {
418 char linebuf[2000], *p, *q;
420 const struct configcommandinfo *ccip;
423 (l= getline(ads,&gl_ctx, filename,lno, linebuf,sizeof(linebuf))) != -1;
425 if (l == -2) continue;
426 while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
429 while (ctype_whitespace(*p)) p++;
430 if (*p == '#' || *p == ';' || !*p) continue;
432 while (*q && !ctype_whitespace(*q)) q++;
434 for (ccip=configcommandinfos;
436 !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p));
439 adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'",
440 filename,lno,(int)(q-p),p);
443 while (ctype_whitespace(*q)) q++;
444 ccip->fn(ads,filename,lno,q);
448 static const char *instrum_getenv(adns_state ads, const char *envvar) {
451 value= getenv(envvar);
452 if (!value) adns__debug(ads,-1,0,"environment variable %s not set",envvar);
453 else adns__debug(ads,-1,0,"environment variable %s"
454 " set to `%s'",envvar,value);
458 static void readconfig(adns_state ads, const char *filename, int warnmissing) {
461 gl_ctx.file= fopen(filename,"r");
463 if (errno == ENOENT) {
465 adns__debug(ads,-1,0, "configuration file"
466 " `%s' does not exist",filename);
470 adns__diag(ads,-1,0,"cannot open configuration file `%s': %s",
471 filename,strerror(errno));
475 readconfiggeneric(ads,filename,gl_file,gl_ctx);
480 static void readconfigtext(adns_state ads, const char *text,
481 const char *showname) {
485 readconfiggeneric(ads,showname,gl_text,gl_ctx);
488 static void readconfigenv(adns_state ads, const char *envvar) {
489 const char *filename;
491 if (ads->iflags & adns_if_noenv) {
492 adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
495 filename= instrum_getenv(ads,envvar);
496 if (filename) readconfig(ads,filename,1);
499 static void readconfigenvtext(adns_state ads, const char *envvar) {
500 const char *textdata;
502 if (ads->iflags & adns_if_noenv) {
503 adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
506 textdata= instrum_getenv(ads,envvar);
507 if (textdata) readconfigtext(ads,textdata,envvar);
511 int adns__setnonblock(adns_state ads, int fd) {
514 r= fcntl(fd,F_GETFL,0); if (r<0) return errno;
516 r= fcntl(fd,F_SETFL,r); if (r<0) return errno;
520 static int init_begin(adns_state *ads_r, adns_initflags flags,
521 adns_logcallbackfn *logfn, void *logfndata) {
525 ads= malloc(sizeof(*ads)); if (!ads) return errno;
529 ads->logfndata= logfndata;
531 LIST_INIT(ads->udpw);
532 LIST_INIT(ads->tcpw);
533 LIST_INIT(ads->childw);
534 LIST_INIT(ads->output);
537 ads->udpsocket= ads->tcpsocket= -1;
538 adns__vbuf_init(&ads->tcpsend);
539 adns__vbuf_init(&ads->tcprecv);
540 ads->tcprecv_skip= 0;
541 ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0;
543 ads->tcpstate= server_disconnected;
544 timerclear(&ads->tcptimeout);
548 ads->rand48xsubi[0]= pid;
549 ads->rand48xsubi[1]= (unsigned long)pid >> 16;
550 ads->rand48xsubi[2]= pid ^ ((unsigned long)pid >> 16);
556 static int init_finish(adns_state ads) {
558 struct protoent *proto;
561 if (!ads->nservers) {
562 if (ads->logfn && ads->iflags & adns_if_debug)
563 adns__lprintf(ads,"adns: no nameservers, using localhost\n");
564 ia.s_addr= htonl(INADDR_LOOPBACK);
568 proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
569 ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto);
570 if (ads->udpsocket<0) { r= errno; goto x_free; }
572 r= adns__setnonblock(ads,ads->udpsocket);
573 if (r) { r= errno; goto x_closeudp; }
578 close(ads->udpsocket);
584 static void init_abort(adns_state ads) {
585 if (ads->nsearchlist) {
586 free(ads->searchlist[0]);
587 free(ads->searchlist);
592 static void logfn_file(adns_state ads, void *logfndata,
593 const char *fmt, va_list al) {
594 vfprintf(logfndata,fmt,al);
597 static int init_files(adns_state *ads_r, adns_initflags flags,
598 adns_logcallbackfn *logfn, void *logfndata) {
600 const char *res_options, *adns_res_options;
603 r= init_begin(&ads, flags, logfn, logfndata);
606 res_options= instrum_getenv(ads,"RES_OPTIONS");
607 adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
608 ccf_options(ads,"RES_OPTIONS",-1,res_options);
609 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
611 readconfig(ads,"/etc/resolv.conf",1);
612 readconfig(ads,"/etc/resolv-adns.conf",0);
613 readconfigenv(ads,"RES_CONF");
614 readconfigenv(ads,"ADNS_RES_CONF");
616 readconfigenvtext(ads,"RES_CONF_TEXT");
617 readconfigenvtext(ads,"ADNS_RES_CONF_TEXT");
619 ccf_options(ads,"RES_OPTIONS",-1,res_options);
620 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
622 ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
623 ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
625 if (ads->configerrno && ads->configerrno != EINVAL) {
634 adns__consistency(ads,0,cc_entex);
639 int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
640 return init_files(ads_r, flags, logfn_file, diagfile ? diagfile : stderr);
643 static int init_strcfg(adns_state *ads_r, adns_initflags flags,
644 adns_logcallbackfn *logfn, void *logfndata,
645 const char *configtext) {
649 r= init_begin(&ads, flags, logfn, logfndata);
652 readconfigtext(ads,configtext,"<supplied configuration text>");
653 if (ads->configerrno) {
659 r= init_finish(ads); if (r) return r;
660 adns__consistency(ads,0,cc_entex);
665 int adns_init_strcfg(adns_state *ads_r, adns_initflags flags,
666 FILE *diagfile, const char *configtext) {
667 return init_strcfg(ads_r, flags,
668 diagfile ? logfn_file : 0, diagfile,
672 int adns_init_logfn(adns_state *newstate_r, adns_initflags flags,
673 const char *configtext /*0=>use default config files*/,
674 adns_logcallbackfn *logfn /*0=>logfndata is a FILE* */,
675 void *logfndata /*0 with logfn==0 => discard*/) {
676 if (!logfn && logfndata)
679 return init_strcfg(newstate_r, flags, logfn, logfndata, configtext);
681 return init_files(newstate_r, flags, logfn, logfndata);
684 void adns_finish(adns_state ads) {
685 adns__consistency(ads,0,cc_entex);
687 if (ads->udpw.head) adns_cancel(ads->udpw.head);
688 else if (ads->tcpw.head) adns_cancel(ads->tcpw.head);
689 else if (ads->childw.head) adns_cancel(ads->childw.head);
690 else if (ads->output.head) adns_cancel(ads->output.head);
693 close(ads->udpsocket);
694 if (ads->tcpsocket >= 0) close(ads->tcpsocket);
695 adns__vbuf_free(&ads->tcpsend);
696 adns__vbuf_free(&ads->tcprecv);
701 void adns_forallqueries_begin(adns_state ads) {
702 adns__consistency(ads,0,cc_entex);
704 ads->udpw.head ? ads->udpw.head :
705 ads->tcpw.head ? ads->tcpw.head :
706 ads->childw.head ? ads->childw.head :
710 adns_query adns_forallqueries_next(adns_state ads, void **context_r) {
713 adns__consistency(ads,0,cc_entex);
714 nqu= ads->forallnext;
720 } else if (qu == ads->udpw.tail) {
722 ads->tcpw.head ? ads->tcpw.head :
723 ads->childw.head ? ads->childw.head :
725 } else if (qu == ads->tcpw.tail) {
727 ads->childw.head ? ads->childw.head :
729 } else if (qu == ads->childw.tail) {
730 nqu= ads->output.head;
734 if (!qu->parent) break;
736 ads->forallnext= nqu;
737 if (context_r) *context_r= qu->ctx.ext;