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 sockaddr *sa, int n) {
47 char buf[MAX_ADDRSTRLEN];
49 if (!adns__af_supported_p(sa->sa_family)) {
51 "nameserver %s for unknown address family %d ignored",
52 adns__sockaddr_ntoa(sa, n, buf), sa->sa_family);
55 for (i=0; i<ads->nservers; i++) {
56 if (adns__sockaddr_equal_p(sa, &ads->servers[i].addr.sa)) {
57 adns__debug(ads,-1,0,"duplicate nameserver %s ignored",
58 adns__sockaddr_ntoa(sa, n, buf));
63 if (ads->nservers>=MAXSERVERS) {
64 adns__diag(ads,-1,0,"too many nameservers, ignoring %s",
65 adns__sockaddr_ntoa(sa, n, buf));
69 ss= ads->servers+ads->nservers;
70 assert(n <= sizeof(ss->addr));
72 memcpy(&ss->addr, sa, n);
76 static void freesearchlist(adns_state ads) {
77 if (ads->nsearchlist) free(*ads->searchlist);
78 free(ads->searchlist);
81 static void saveerr(adns_state ads, int en) {
82 if (!ads->configerrno) ads->configerrno= en;
85 static void configparseerr(adns_state ads, const char *fn, int lno,
86 const char *fmt, ...) {
90 if (!ads->logfn || (ads->iflags & adns_if_noerrprint)) return;
92 if (lno==-1) adns__lprintf(ads,"adns: %s: ",fn);
93 else adns__lprintf(ads,"adns: %s:%d: ",fn,lno);
95 adns__vlprintf(ads,fmt,al);
97 adns__lprintf(ads,"\n");
100 static int nextword(const char **bufp_io, const char **word_r, int *l_r) {
104 while (ctype_whitespace(*p)) p++;
108 while (*q && !ctype_whitespace(*q)) q++;
117 static void ccf_nameserver(adns_state ads, const char *fn,
118 int lno, const char *buf) {
119 struct addrinfo *ai, ai_hint = { 0 };
120 char addrbuf[MAX_ADDRSTRLEN];
123 ai_hint.ai_family = AF_UNSPEC;
124 ai_hint.ai_socktype = SOCK_DGRAM;
125 ai_hint.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV;
127 err = getaddrinfo(buf, STRINGIFY(DNS_PORT), &ai_hint, &ai);
129 configparseerr(ads,fn,lno,"invalid nameserver address `%s' (%s)",
130 buf, gai_strerror(err));
134 adns__debug(ads,-1,0,"using nameserver %s",
135 adns__sockaddr_ntoa(ai->ai_addr, ai->ai_addrlen, addrbuf));
136 addserver(ads, ai->ai_addr, ai->ai_addrlen);
140 static void ccf_search(adns_state ads, const char *fn,
141 int lno, const char *buf) {
142 const char *bufp, *word;
143 char *newchars, **newptrs, **pp;
151 while (nextword(&bufp,&word,&l)) { count++; tl += l+1; }
153 newptrs= malloc(sizeof(char*)*count);
154 if (!newptrs) { saveerr(ads,errno); return; }
156 newchars= malloc(tl);
157 if (!newchars) { saveerr(ads,errno); free(newptrs); return; }
161 while (nextword(&bufp,&word,&l)) {
163 memcpy(newchars,word,l);
169 ads->nsearchlist= count;
170 ads->searchlist= newptrs;
173 static void ccf_sortlist(adns_state ads, const char *fn,
174 int lno, const char *buf) {
176 char tbuf[200], *slash, *ep;
177 const char *maskwhat;
186 while (nextword(&buf,&word,&l)) {
187 if (ads->nsortlist >= MAXSORTLIST) {
188 adns__diag(ads,-1,0,"too many sortlist entries,"
189 " ignoring %.*s onwards",l,word);
193 if (l >= sizeof(tbuf)) {
194 configparseerr(ads,fn,lno,"sortlist entry `%.*s' too long",l,word);
198 memcpy(tbuf,word,l); tbuf[l]= 0;
199 slash= strchr(tbuf,'/');
200 if (slash) *slash++= 0;
202 sl= &ads->sortlist[ads->nsortlist];
204 if (!adns__gen_pton(tbuf, &af, &sl->base)) {
205 configparseerr(ads,fn,lno,"invalid address `%s' in sortlist",tbuf);
210 if (slash[strspn(slash, "0123456789")]) {
212 if (!inet_pton(af,slash,&sl->mask)) {
213 configparseerr(ads,fn,lno,"invalid mask `%s' in sortlist",slash);
217 maskwhat = "prefix length";
218 initial= strtoul(slash,&ep,10);
219 if (*ep || initial>adns__addr_width(af)) {
220 configparseerr(ads,fn,lno,"mask length `%s' invalid",slash);
223 adns__prefix_mask(af, initial, &sl->mask);
226 maskwhat = "implied prefix length";
227 initial = adns__guess_prefix_length(af, &sl->base);
229 configparseerr(ads,fn,lno, "network address `%s'"
230 " in sortlist is not in classed ranges,"
231 " must specify mask explicitly", tbuf);
234 adns__prefix_mask(af, initial, &sl->mask);
237 if (!adns__addr_match_p(af,&sl->base, af,&sl->base,&sl->mask)) {
239 configparseerr(ads,fn,lno, "%s %d in sortlist"
240 " overlaps address `%s'",maskwhat,initial,tbuf);
242 configparseerr(ads,fn,lno, "%s `%s' in sortlist"
243 " overlaps address `%s'",maskwhat,slash,tbuf);
253 static void ccf_options(adns_state ads, const char *fn,
254 int lno, const char *buf) {
262 while (nextword(&buf,&word,&l)) {
263 if (l==5 && !memcmp(word,"debug",5)) {
264 ads->iflags |= adns_if_debug;
267 if (l>=6 && !memcmp(word,"ndots:",6)) {
268 v= strtoul(word+6,&ep,10);
269 if (l==6 || ep != word+l || v > INT_MAX) {
270 configparseerr(ads,fn,lno,"option `%.*s' malformed"
271 " or has bad value",l,word);
277 if (l>=12 && !memcmp(word,"adns_checkc:",12)) {
278 if (!strcmp(word+12,"none")) {
279 ads->iflags &= ~adns_if_checkc_freq;
280 ads->iflags |= adns_if_checkc_entex;
281 } else if (!strcmp(word+12,"entex")) {
282 ads->iflags &= ~adns_if_checkc_freq;
283 ads->iflags |= adns_if_checkc_entex;
284 } else if (!strcmp(word+12,"freq")) {
285 ads->iflags |= adns_if_checkc_freq;
287 configparseerr(ads,fn,lno, "option adns_checkc has bad value `%s' "
288 "(must be none, entex or freq", word+12);
292 if (l>=8 && !memcmp(word,"adns_af:",8)) {
293 if (!strcmp(word+8,"v4only"))
294 ads->iflags = (ads->iflags & ~adns_if_afmask) | adns_if_af_v4only;
295 else if (!strcmp(word+8,"v6only"))
296 ads->iflags = (ads->iflags & ~adns_if_afmask) | adns_if_af_v6only;
297 else if (!strcmp(word+8,"any"))
298 ads->iflags = (ads->iflags & ~adns_if_afmask);
300 configparseerr(ads,fn,lno, "option adns_af has bad value `%s' "
301 "(must be any, v4only or v6only", word+8);
305 adns__diag(ads,-1,0,"%s:%d: unknown option `%.*s'", fn,lno, l,word);
309 static void ccf_clearnss(adns_state ads, const char *fn,
310 int lno, const char *buf) {
314 static void ccf_include(adns_state ads, const char *fn,
315 int lno, const char *buf) {
317 configparseerr(ads,fn,lno,"`include' directive with no filename");
320 readconfig(ads,buf,1);
323 static void ccf_lookup(adns_state ads, const char *fn, int lno,
330 configparseerr(ads,fn,lno,"`lookup' directive with no databases");
334 while (nextword(&buf,&word,&l)) {
335 if (l==4 && !memcmp(word,"bind",4)) {
337 } else if (l==4 && !memcmp(word,"file",4)) {
338 /* ignore this and hope /etc/hosts is not essential */
339 } else if (l==2 && !memcmp(word,"yp",2)) {
340 adns__diag(ads,-1,0,"%s:%d: yp lookups not supported by adns", fn,lno);
343 adns__diag(ads,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
349 adns__diag(ads,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn,lno);
352 static const struct configcommandinfo {
354 void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
355 } configcommandinfos[]= {
356 { "nameserver", ccf_nameserver },
357 { "domain", ccf_search },
358 { "search", ccf_search },
359 { "sortlist", ccf_sortlist },
360 { "options", ccf_options },
361 { "clearnameservers", ccf_clearnss },
362 { "include", ccf_include },
363 { "lookup", ccf_lookup }, /* OpenBSD */
372 static int gl_file(adns_state ads, getline_ctx *src_io, const char *filename,
373 int lno, char *buf, int buflen) {
374 FILE *file= src_io->file;
382 for (;;) { /* loop over chars */
384 adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
389 adns__diag(ads,-1,0,"%s:%d: line contains nul, ignored",filename,lno);
391 } else if (c == '\n') {
393 } else if (c == EOF) {
396 adns__diag(ads,-1,0,"%s:%d: read error: %s",
397 filename,lno,strerror(errno));
413 while ((c= getc(file)) != EOF && c != '\n');
417 static int gl_text(adns_state ads, getline_ctx *src_io, const char *filename,
418 int lno, char *buf, int buflen) {
419 const char *cp= src_io->text;
422 if (!cp || !*cp) return -1;
424 if (*cp == ';' || *cp == '\n') cp++;
425 l= strcspn(cp,";\n");
429 adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
439 static void readconfiggeneric(adns_state ads, const char *filename,
440 int (*getline)(adns_state ads, getline_ctx*,
441 const char *filename, int lno,
442 char *buf, int buflen),
443 /* Returns >=0 for success, -1 for EOF or error
444 * (error will have been reported), or -2 for
445 * bad line was encountered, try again.
447 getline_ctx gl_ctx) {
448 char linebuf[2000], *p, *q;
450 const struct configcommandinfo *ccip;
453 (l= getline(ads,&gl_ctx, filename,lno, linebuf,sizeof(linebuf))) != -1;
455 if (l == -2) continue;
456 while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
459 while (ctype_whitespace(*p)) p++;
460 if (*p == '#' || *p == ';' || !*p) continue;
462 while (*q && !ctype_whitespace(*q)) q++;
464 for (ccip=configcommandinfos;
466 !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p));
469 adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'",
470 filename,lno,(int)(q-p),p);
473 while (ctype_whitespace(*q)) q++;
474 ccip->fn(ads,filename,lno,q);
478 static const char *instrum_getenv(adns_state ads, const char *envvar) {
481 value= getenv(envvar);
482 if (!value) adns__debug(ads,-1,0,"environment variable %s not set",envvar);
483 else adns__debug(ads,-1,0,"environment variable %s"
484 " set to `%s'",envvar,value);
488 static void readconfig(adns_state ads, const char *filename, int warnmissing) {
491 gl_ctx.file= fopen(filename,"r");
493 if (errno == ENOENT) {
495 adns__debug(ads,-1,0, "configuration file"
496 " `%s' does not exist",filename);
500 adns__diag(ads,-1,0,"cannot open configuration file `%s': %s",
501 filename,strerror(errno));
505 readconfiggeneric(ads,filename,gl_file,gl_ctx);
510 static void readconfigtext(adns_state ads, const char *text,
511 const char *showname) {
515 readconfiggeneric(ads,showname,gl_text,gl_ctx);
518 static void readconfigenv(adns_state ads, const char *envvar) {
519 const char *filename;
521 if (ads->iflags & adns_if_noenv) {
522 adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
525 filename= instrum_getenv(ads,envvar);
526 if (filename) readconfig(ads,filename,1);
529 static void readconfigenvtext(adns_state ads, const char *envvar) {
530 const char *textdata;
532 if (ads->iflags & adns_if_noenv) {
533 adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
536 textdata= instrum_getenv(ads,envvar);
537 if (textdata) readconfigtext(ads,textdata,envvar);
541 int adns__setnonblock(adns_state ads, int fd) {
544 r= fcntl(fd,F_GETFL,0); if (r<0) return errno;
546 r= fcntl(fd,F_SETFL,r); if (r<0) return errno;
550 static int init_begin(adns_state *ads_r, adns_initflags flags,
551 adns_logcallbackfn *logfn, void *logfndata) {
555 ads= malloc(sizeof(*ads)); if (!ads) return errno;
559 ads->logfndata= logfndata;
561 LIST_INIT(ads->udpw);
562 LIST_INIT(ads->tcpw);
563 LIST_INIT(ads->childw);
564 LIST_INIT(ads->output);
569 adns__vbuf_init(&ads->tcpsend);
570 adns__vbuf_init(&ads->tcprecv);
571 ads->tcprecv_skip= 0;
572 ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0;
574 ads->tcpstate= server_disconnected;
575 timerclear(&ads->tcptimeout);
579 ads->rand48xsubi[0]= pid;
580 ads->rand48xsubi[1]= (unsigned long)pid >> 16;
581 ads->rand48xsubi[2]= pid ^ ((unsigned long)pid >> 16);
587 static int init_finish(adns_state ads) {
588 struct sockaddr_in sin;
589 struct protoent *proto;
590 struct udpsocket *udp;
594 if (!ads->nservers) {
595 if (ads->logfn && ads->iflags & adns_if_debug)
596 adns__lprintf(ads,"adns: no nameservers, using IPv4 localhost\n");
597 memset(&sin, 0, sizeof(sin));
598 sin.sin_family = AF_INET;
599 sin.sin_port = htons(DNS_PORT);
600 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
601 addserver(ads,(struct sockaddr *)&sin, sizeof(sin));
604 proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
606 for (i = 0; i < ads->nservers; i++) {
607 if (adns__udpsocket_by_af(ads, ads->servers[i].addr.sa.sa_family))
609 assert(ads->nudp < MAXUDP);
610 udp = &ads->udpsocket[ads->nudp];
611 udp->af = ads->servers[i].addr.sa.sa_family;
612 udp->fd = socket(udp->af,SOCK_DGRAM,proto->p_proto);
613 if (udp->fd < 0) { r= errno; goto x_free; }
614 r= adns__setnonblock(ads,udp->fd);
615 if (r) { r= errno; goto x_closeudp; }
622 for (j = 0; j < ads->nudp; j++) close(ads->udpsocket[j].fd);
628 static void init_abort(adns_state ads) {
629 if (ads->nsearchlist) {
630 free(ads->searchlist[0]);
631 free(ads->searchlist);
636 static void logfn_file(adns_state ads, void *logfndata,
637 const char *fmt, va_list al) {
638 vfprintf(logfndata,fmt,al);
641 static int init_files(adns_state *ads_r, adns_initflags flags,
642 adns_logcallbackfn *logfn, void *logfndata) {
644 const char *res_options, *adns_res_options;
647 r= init_begin(&ads, flags, logfn, logfndata);
650 res_options= instrum_getenv(ads,"RES_OPTIONS");
651 adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
652 ccf_options(ads,"RES_OPTIONS",-1,res_options);
653 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
655 readconfig(ads,"/etc/resolv.conf",1);
656 readconfig(ads,"/etc/resolv-adns.conf",0);
657 readconfigenv(ads,"RES_CONF");
658 readconfigenv(ads,"ADNS_RES_CONF");
660 readconfigenvtext(ads,"RES_CONF_TEXT");
661 readconfigenvtext(ads,"ADNS_RES_CONF_TEXT");
663 ccf_options(ads,"RES_OPTIONS",-1,res_options);
664 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
666 ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
667 ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
669 if (ads->configerrno && ads->configerrno != EINVAL) {
678 adns__consistency(ads,0,cc_entex);
683 int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
684 return init_files(ads_r, flags, logfn_file, diagfile ? diagfile : stderr);
687 static int init_strcfg(adns_state *ads_r, adns_initflags flags,
688 adns_logcallbackfn *logfn, void *logfndata,
689 const char *configtext) {
693 r= init_begin(&ads, flags, logfn, logfndata);
696 readconfigtext(ads,configtext,"<supplied configuration text>");
697 if (ads->configerrno) {
703 r= init_finish(ads); if (r) return r;
704 adns__consistency(ads,0,cc_entex);
709 int adns_init_strcfg(adns_state *ads_r, adns_initflags flags,
710 FILE *diagfile, const char *configtext) {
711 return init_strcfg(ads_r, flags,
712 diagfile ? logfn_file : 0, diagfile,
716 int adns_init_logfn(adns_state *newstate_r, adns_initflags flags,
717 const char *configtext /*0=>use default config files*/,
718 adns_logcallbackfn *logfn /*0=>logfndata is a FILE* */,
719 void *logfndata /*0 with logfn==0 => discard*/) {
720 if (!logfn && logfndata)
723 return init_strcfg(newstate_r, flags, logfn, logfndata, configtext);
725 return init_files(newstate_r, flags, logfn, logfndata);
728 void adns_finish(adns_state ads) {
730 adns__consistency(ads,0,cc_entex);
732 if (ads->udpw.head) adns_cancel(ads->udpw.head);
733 else if (ads->tcpw.head) adns_cancel(ads->tcpw.head);
734 else if (ads->childw.head) adns_cancel(ads->childw.head);
735 else if (ads->output.head) adns_cancel(ads->output.head);
738 for (i = 0; i < ads->nudp; i++) close(ads->udpsocket[i].fd);
739 if (ads->tcpsocket >= 0) close(ads->tcpsocket);
740 adns__vbuf_free(&ads->tcpsend);
741 adns__vbuf_free(&ads->tcprecv);
746 void adns_forallqueries_begin(adns_state ads) {
747 adns__consistency(ads,0,cc_entex);
749 ads->udpw.head ? ads->udpw.head :
750 ads->tcpw.head ? ads->tcpw.head :
751 ads->childw.head ? ads->childw.head :
755 adns_query adns_forallqueries_next(adns_state ads, void **context_r) {
758 adns__consistency(ads,0,cc_entex);
759 nqu= ads->forallnext;
765 } else if (qu == ads->udpw.tail) {
767 ads->tcpw.head ? ads->tcpw.head :
768 ads->childw.head ? ads->childw.head :
770 } else if (qu == ads->tcpw.tail) {
772 ads->childw.head ? ads->childw.head :
774 } else if (qu == ads->childw.tail) {
775 nqu= ads->output.head;
779 if (!qu->parent) break;
781 ads->forallnext= nqu;
782 if (context_r) *context_r= qu->ctx.ext;