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 const afinfo *const transport_aftab[] = {
50 static const afinfo *find_afinfo(int af)
54 for (i = 0; transport_aftab[i]; i++)
55 if (transport_aftab[i]->af == af) return transport_aftab[i];
59 static void addserver(adns_state ads, struct sockaddr *sa, int n) {
63 char buf[MAX_ADDRSTRLEN];
65 ai = find_afinfo(sa->sa_family);
68 "nameserver %s for unknown address family %d ignored",
69 adns__sockaddr_ntoa(sa, n, buf), sa->sa_family);
72 for (i=0; i<ads->nservers; i++) {
73 if (ads->servers[i].addr.sa.sa_family == sa->sa_family &&
74 ai->sockaddr_equalp(sa, &ads->servers[i].addr.sa)) {
75 adns__debug(ads,-1,0,"duplicate nameserver %s ignored",
76 adns__sockaddr_ntoa(sa, n, buf));
81 if (ads->nservers>=MAXSERVERS) {
82 adns__diag(ads,-1,0,"too many nameservers, ignoring %s",
83 adns__sockaddr_ntoa(sa, n, buf));
87 ss= ads->servers+ads->nservers;
88 assert(n <= sizeof(ss->addr));
90 memcpy(&ss->addr, sa, n);
94 static void freesearchlist(adns_state ads) {
95 if (ads->nsearchlist) free(*ads->searchlist);
96 free(ads->searchlist);
99 static void saveerr(adns_state ads, int en) {
100 if (!ads->configerrno) ads->configerrno= en;
103 static void configparseerr(adns_state ads, const char *fn, int lno,
104 const char *fmt, ...) {
108 if (!ads->logfn || (ads->iflags & adns_if_noerrprint)) return;
110 if (lno==-1) adns__lprintf(ads,"adns: %s: ",fn);
111 else adns__lprintf(ads,"adns: %s:%d: ",fn,lno);
113 adns__vlprintf(ads,fmt,al);
115 adns__lprintf(ads,"\n");
118 static int nextword(const char **bufp_io, const char **word_r, int *l_r) {
122 while (ctype_whitespace(*p)) p++;
126 while (*q && !ctype_whitespace(*q)) q++;
135 static void ccf_nameserver(adns_state ads, const char *fn,
136 int lno, const char *buf) {
137 struct addrinfo *ai, ai_hint = { 0 };
138 char addrbuf[MAX_ADDRSTRLEN];
141 ai_hint.ai_family = AF_UNSPEC;
142 ai_hint.ai_socktype = SOCK_DGRAM;
143 ai_hint.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV;
145 err = getaddrinfo(buf, STRINGIFY(DNS_PORT), &ai_hint, &ai);
147 configparseerr(ads,fn,lno,"invalid nameserver address `%s' (%s)",
148 buf, gai_strerror(err));
152 adns__debug(ads,-1,0,"using nameserver %s",
153 adns__sockaddr_ntoa(ai->ai_addr, ai->ai_addrlen, addrbuf));
154 addserver(ads, ai->ai_addr, ai->ai_addrlen);
158 static void ccf_search(adns_state ads, const char *fn,
159 int lno, const char *buf) {
160 const char *bufp, *word;
161 char *newchars, **newptrs, **pp;
169 while (nextword(&bufp,&word,&l)) { count++; tl += l+1; }
171 newptrs= malloc(sizeof(char*)*count);
172 if (!newptrs) { saveerr(ads,errno); return; }
174 newchars= malloc(tl);
175 if (!newchars) { saveerr(ads,errno); free(newptrs); return; }
179 while (nextword(&bufp,&word,&l)) {
181 memcpy(newchars,word,l);
187 ads->nsearchlist= count;
188 ads->searchlist= newptrs;
191 static void ccf_sortlist(adns_state ads, const char *fn,
192 int lno, const char *buf) {
194 char tbuf[200], *slash, *ep;
195 const char *maskwhat;
204 while (nextword(&buf,&word,&l)) {
205 if (ads->nsortlist >= MAXSORTLIST) {
206 adns__diag(ads,-1,0,"too many sortlist entries,"
207 " ignoring %.*s onwards",l,word);
211 if (l >= sizeof(tbuf)) {
212 configparseerr(ads,fn,lno,"sortlist entry `%.*s' too long",l,word);
216 memcpy(tbuf,word,l); tbuf[l]= 0;
217 slash= strchr(tbuf,'/');
218 if (slash) *slash++= 0;
220 sl= &ads->sortlist[ads->nsortlist];
222 if (strchr(tbuf, ':'))
223 ai= &adns__inet6_afinfo;
225 ai= &adns__inet_afinfo;
227 if (!inet_pton(ai->af, tbuf, &sl->base)) {
228 configparseerr(ads,fn,lno,"invalid address `%s' in sortlist",tbuf);
233 if (strchr(slash,ai->delim)) {
235 if (!inet_pton(ai->af,slash,&sl->mask)) {
236 configparseerr(ads,fn,lno,"invalid mask `%s' in sortlist",slash);
240 maskwhat = "prefix length";
241 initial= strtoul(slash,&ep,10);
242 if (*ep || initial>ai->width) {
243 configparseerr(ads,fn,lno,"mask length `%s' invalid",slash);
246 ai->prefix_mask(initial, &sl->mask);
249 maskwhat = "implied prefix length";
250 initial = ai->guess_len(&sl->base);
252 configparseerr(ads,fn,lno, "network address `%s'"
253 " in sortlist is not in classed ranges,"
254 " must specify mask explicitly", tbuf);
257 ai->prefix_mask(initial, &sl->mask);
260 if (!ai->matchp(&sl->base, &sl->base, &sl->mask)) {
262 configparseerr(ads,fn,lno, "%s %d in sortlist"
263 " overlaps address `%s'",maskwhat,initial,tbuf);
265 configparseerr(ads,fn,lno, "%s `%s' in sortlist"
266 " overlaps address `%s'",maskwhat,slash,tbuf);
276 static void ccf_options(adns_state ads, const char *fn,
277 int lno, const char *buf) {
285 while (nextword(&buf,&word,&l)) {
286 if (l==5 && !memcmp(word,"debug",5)) {
287 ads->iflags |= adns_if_debug;
290 if (l>=6 && !memcmp(word,"ndots:",6)) {
291 v= strtoul(word+6,&ep,10);
292 if (l==6 || ep != word+l || v > INT_MAX) {
293 configparseerr(ads,fn,lno,"option `%.*s' malformed"
294 " or has bad value",l,word);
300 if (l>=12 && !memcmp(word,"adns_checkc:",12)) {
301 if (!strcmp(word+12,"none")) {
302 ads->iflags &= ~adns_if_checkc_freq;
303 ads->iflags |= adns_if_checkc_entex;
304 } else if (!strcmp(word+12,"entex")) {
305 ads->iflags &= ~adns_if_checkc_freq;
306 ads->iflags |= adns_if_checkc_entex;
307 } else if (!strcmp(word+12,"freq")) {
308 ads->iflags |= adns_if_checkc_freq;
310 configparseerr(ads,fn,lno, "option adns_checkc has bad value `%s' "
311 "(must be none, entex or freq", word+12);
315 if (l>=8 && !memcmp(word,"adns_af:",8)) {
316 if (!strcmp(word+8,"v4only"))
317 ads->iflags = (ads->iflags & ~adns_if_afmask) | adns_if_af_v4only;
318 else if (!strcmp(word+8,"v6only"))
319 ads->iflags = (ads->iflags & ~adns_if_afmask) | adns_if_af_v6only;
320 else if (!strcmp(word+8,"any"))
321 ads->iflags = (ads->iflags & ~adns_if_afmask);
323 configparseerr(ads,fn,lno, "option adns_af has bad value `%s' "
324 "(must be any, v4only or v6only", word+8);
328 adns__diag(ads,-1,0,"%s:%d: unknown option `%.*s'", fn,lno, l,word);
332 static void ccf_clearnss(adns_state ads, const char *fn,
333 int lno, const char *buf) {
337 static void ccf_include(adns_state ads, const char *fn,
338 int lno, const char *buf) {
340 configparseerr(ads,fn,lno,"`include' directive with no filename");
343 readconfig(ads,buf,1);
346 static void ccf_lookup(adns_state ads, const char *fn, int lno,
353 configparseerr(ads,fn,lno,"`lookup' directive with no databases");
357 while (nextword(&buf,&word,&l)) {
358 if (l==4 && !memcmp(word,"bind",4)) {
360 } else if (l==4 && !memcmp(word,"file",4)) {
361 /* ignore this and hope /etc/hosts is not essential */
362 } else if (l==2 && !memcmp(word,"yp",2)) {
363 adns__diag(ads,-1,0,"%s:%d: yp lookups not supported by adns", fn,lno);
366 adns__diag(ads,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
372 adns__diag(ads,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn,lno);
375 static const struct configcommandinfo {
377 void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
378 } configcommandinfos[]= {
379 { "nameserver", ccf_nameserver },
380 { "domain", ccf_search },
381 { "search", ccf_search },
382 { "sortlist", ccf_sortlist },
383 { "options", ccf_options },
384 { "clearnameservers", ccf_clearnss },
385 { "include", ccf_include },
386 { "lookup", ccf_lookup }, /* OpenBSD */
395 static int gl_file(adns_state ads, getline_ctx *src_io, const char *filename,
396 int lno, char *buf, int buflen) {
397 FILE *file= src_io->file;
405 for (;;) { /* loop over chars */
407 adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
412 adns__diag(ads,-1,0,"%s:%d: line contains nul, ignored",filename,lno);
414 } else if (c == '\n') {
416 } else if (c == EOF) {
419 adns__diag(ads,-1,0,"%s:%d: read error: %s",
420 filename,lno,strerror(errno));
436 while ((c= getc(file)) != EOF && c != '\n');
440 static int gl_text(adns_state ads, getline_ctx *src_io, const char *filename,
441 int lno, char *buf, int buflen) {
442 const char *cp= src_io->text;
445 if (!cp || !*cp) return -1;
447 if (*cp == ';' || *cp == '\n') cp++;
448 l= strcspn(cp,";\n");
452 adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
462 static void readconfiggeneric(adns_state ads, const char *filename,
463 int (*getline)(adns_state ads, getline_ctx*,
464 const char *filename, int lno,
465 char *buf, int buflen),
466 /* Returns >=0 for success, -1 for EOF or error
467 * (error will have been reported), or -2 for
468 * bad line was encountered, try again.
470 getline_ctx gl_ctx) {
471 char linebuf[2000], *p, *q;
473 const struct configcommandinfo *ccip;
476 (l= getline(ads,&gl_ctx, filename,lno, linebuf,sizeof(linebuf))) != -1;
478 if (l == -2) continue;
479 while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
482 while (ctype_whitespace(*p)) p++;
483 if (*p == '#' || *p == ';' || !*p) continue;
485 while (*q && !ctype_whitespace(*q)) q++;
487 for (ccip=configcommandinfos;
489 !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p));
492 adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'",
493 filename,lno,(int)(q-p),p);
496 while (ctype_whitespace(*q)) q++;
497 ccip->fn(ads,filename,lno,q);
501 static const char *instrum_getenv(adns_state ads, const char *envvar) {
504 value= getenv(envvar);
505 if (!value) adns__debug(ads,-1,0,"environment variable %s not set",envvar);
506 else adns__debug(ads,-1,0,"environment variable %s"
507 " set to `%s'",envvar,value);
511 static void readconfig(adns_state ads, const char *filename, int warnmissing) {
514 gl_ctx.file= fopen(filename,"r");
516 if (errno == ENOENT) {
518 adns__debug(ads,-1,0, "configuration file"
519 " `%s' does not exist",filename);
523 adns__diag(ads,-1,0,"cannot open configuration file `%s': %s",
524 filename,strerror(errno));
528 readconfiggeneric(ads,filename,gl_file,gl_ctx);
533 static void readconfigtext(adns_state ads, const char *text,
534 const char *showname) {
538 readconfiggeneric(ads,showname,gl_text,gl_ctx);
541 static void readconfigenv(adns_state ads, const char *envvar) {
542 const char *filename;
544 if (ads->iflags & adns_if_noenv) {
545 adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
548 filename= instrum_getenv(ads,envvar);
549 if (filename) readconfig(ads,filename,1);
552 static void readconfigenvtext(adns_state ads, const char *envvar) {
553 const char *textdata;
555 if (ads->iflags & adns_if_noenv) {
556 adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
559 textdata= instrum_getenv(ads,envvar);
560 if (textdata) readconfigtext(ads,textdata,envvar);
564 int adns__setnonblock(adns_state ads, int fd) {
567 r= fcntl(fd,F_GETFL,0); if (r<0) return errno;
569 r= fcntl(fd,F_SETFL,r); if (r<0) return errno;
573 static int init_begin(adns_state *ads_r, adns_initflags flags,
574 adns_logcallbackfn *logfn, void *logfndata) {
578 ads= malloc(sizeof(*ads)); if (!ads) return errno;
582 ads->logfndata= logfndata;
584 LIST_INIT(ads->udpw);
585 LIST_INIT(ads->tcpw);
586 LIST_INIT(ads->childw);
587 LIST_INIT(ads->output);
592 adns__vbuf_init(&ads->tcpsend);
593 adns__vbuf_init(&ads->tcprecv);
594 ads->tcprecv_skip= 0;
595 ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0;
597 ads->tcpstate= server_disconnected;
598 timerclear(&ads->tcptimeout);
602 ads->rand48xsubi[0]= pid;
603 ads->rand48xsubi[1]= (unsigned long)pid >> 16;
604 ads->rand48xsubi[2]= pid ^ ((unsigned long)pid >> 16);
610 static int init_finish(adns_state ads) {
611 struct sockaddr_in sin;
612 struct protoent *proto;
613 struct udpsocket *udp;
617 if (!ads->nservers) {
618 if (ads->logfn && ads->iflags & adns_if_debug)
619 adns__lprintf(ads,"adns: no nameservers, using IPv4 localhost\n");
620 memset(&sin, 0, sizeof(sin));
621 sin.sin_family = AF_INET;
622 sin.sin_port = htons(DNS_PORT);
623 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
624 addserver(ads,(struct sockaddr *)&sin, sizeof(sin));
627 proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
629 for (i = 0; i < ads->nservers; i++) {
630 for (j = 0; j < ads->nudp; j++) {
631 if (ads->udpsocket[j].ai->af == ads->servers[i].addr.sa.sa_family)
635 assert(ads->nudp < MAXUDP);
636 udp = &ads->udpsocket[ads->nudp];
637 udp->ai = find_afinfo(ads->servers[i].addr.sa.sa_family);
639 udp->fd = socket(udp->ai->af,SOCK_DGRAM,proto->p_proto);
640 if (udp->fd < 0) { r= errno; goto x_free; }
641 r= adns__setnonblock(ads,udp->fd);
642 if (r) { r= errno; goto x_closeudp; }
651 for (j = 0; j < ads->nudp; j++) close(ads->udpsocket[j].fd);
657 static void init_abort(adns_state ads) {
658 if (ads->nsearchlist) {
659 free(ads->searchlist[0]);
660 free(ads->searchlist);
665 static void logfn_file(adns_state ads, void *logfndata,
666 const char *fmt, va_list al) {
667 vfprintf(logfndata,fmt,al);
670 static int init_files(adns_state *ads_r, adns_initflags flags,
671 adns_logcallbackfn *logfn, void *logfndata) {
673 const char *res_options, *adns_res_options;
676 r= init_begin(&ads, flags, logfn, logfndata);
679 res_options= instrum_getenv(ads,"RES_OPTIONS");
680 adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
681 ccf_options(ads,"RES_OPTIONS",-1,res_options);
682 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
684 readconfig(ads,"/etc/resolv.conf",1);
685 readconfig(ads,"/etc/resolv-adns.conf",0);
686 readconfigenv(ads,"RES_CONF");
687 readconfigenv(ads,"ADNS_RES_CONF");
689 readconfigenvtext(ads,"RES_CONF_TEXT");
690 readconfigenvtext(ads,"ADNS_RES_CONF_TEXT");
692 ccf_options(ads,"RES_OPTIONS",-1,res_options);
693 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
695 ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
696 ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
698 if (ads->configerrno && ads->configerrno != EINVAL) {
707 adns__consistency(ads,0,cc_entex);
712 int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
713 return init_files(ads_r, flags, logfn_file, diagfile ? diagfile : stderr);
716 static int init_strcfg(adns_state *ads_r, adns_initflags flags,
717 adns_logcallbackfn *logfn, void *logfndata,
718 const char *configtext) {
722 r= init_begin(&ads, flags, logfn, logfndata);
725 readconfigtext(ads,configtext,"<supplied configuration text>");
726 if (ads->configerrno) {
732 r= init_finish(ads); if (r) return r;
733 adns__consistency(ads,0,cc_entex);
738 int adns_init_strcfg(adns_state *ads_r, adns_initflags flags,
739 FILE *diagfile, const char *configtext) {
740 return init_strcfg(ads_r, flags,
741 diagfile ? logfn_file : 0, diagfile,
745 int adns_init_logfn(adns_state *newstate_r, adns_initflags flags,
746 const char *configtext /*0=>use default config files*/,
747 adns_logcallbackfn *logfn /*0=>logfndata is a FILE* */,
748 void *logfndata /*0 with logfn==0 => discard*/) {
749 if (!logfn && logfndata)
752 return init_strcfg(newstate_r, flags, logfn, logfndata, configtext);
754 return init_files(newstate_r, flags, logfn, logfndata);
757 void adns_finish(adns_state ads) {
759 adns__consistency(ads,0,cc_entex);
761 if (ads->udpw.head) adns_cancel(ads->udpw.head);
762 else if (ads->tcpw.head) adns_cancel(ads->tcpw.head);
763 else if (ads->childw.head) adns_cancel(ads->childw.head);
764 else if (ads->output.head) adns_cancel(ads->output.head);
767 for (i = 0; i < ads->nudp; i++) close(ads->udpsocket[i].fd);
768 if (ads->tcpsocket >= 0) close(ads->tcpsocket);
769 adns__vbuf_free(&ads->tcpsend);
770 adns__vbuf_free(&ads->tcprecv);
775 void adns_forallqueries_begin(adns_state ads) {
776 adns__consistency(ads,0,cc_entex);
778 ads->udpw.head ? ads->udpw.head :
779 ads->tcpw.head ? ads->tcpw.head :
780 ads->childw.head ? ads->childw.head :
784 adns_query adns_forallqueries_next(adns_state ads, void **context_r) {
787 adns__consistency(ads,0,cc_entex);
788 nqu= ads->forallnext;
794 } else if (qu == ads->udpw.tail) {
796 ads->tcpw.head ? ads->tcpw.head :
797 ads->childw.head ? ads->childw.head :
799 } else if (qu == ads->tcpw.tail) {
801 ads->childw.head ? ads->childw.head :
803 } else if (qu == ads->childw.tail) {
804 nqu= ads->output.head;
808 if (!qu->parent) break;
810 ads->forallnext= nqu;
811 if (context_r) *context_r= qu->ctx.ext;