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 3, 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.
33 #include <sys/types.h>
35 #include <sys/socket.h>
36 #include <netinet/in.h>
37 #include <arpa/inet.h>
41 static void readconfig(adns_state ads, const char *filename, int warnmissing);
43 static void addserver(adns_state ads, const struct sockaddr *sa, int salen) {
46 char buf[ADNS_ADDR2TEXT_BUFLEN];
48 for (i=0; i<ads->nservers; i++) {
49 if (adns__sockaddrs_equal(sa, &ads->servers[i].addr.sa)) {
50 adns__debug(ads,-1,0,"duplicate nameserver %s ignored",
51 adns__sockaddr_ntoa(sa, buf));
56 if (ads->nservers>=MAXSERVERS) {
57 adns__diag(ads,-1,0,"too many nameservers, ignoring %s",
58 adns__sockaddr_ntoa(sa, buf));
62 ss= ads->servers+ads->nservers;
63 assert(salen <= sizeof(ss->addr));
65 memcpy(&ss->addr, sa, salen);
69 static void freesearchlist(adns_state ads) {
70 if (ads->nsearchlist) free(*ads->searchlist);
71 free(ads->searchlist);
74 static void saveerr(adns_state ads, int en) {
75 if (!ads->configerrno) ads->configerrno= en;
78 static void configparseerr(adns_state ads, const char *fn, int lno,
79 const char *fmt, ...) {
83 if (!ads->logfn || (ads->iflags & adns_if_noerrprint)) return;
85 if (lno==-1) adns__lprintf(ads,"adns: %s: ",fn);
86 else adns__lprintf(ads,"adns: %s:%d: ",fn,lno);
88 adns__vlprintf(ads,fmt,al);
90 adns__lprintf(ads,"\n");
93 static int nextword(const char **bufp_io, const char **word_r, int *l_r) {
97 while (ctype_whitespace(*p)) p++;
101 while (*q && !ctype_whitespace(*q)) q++;
110 static void ccf_nameserver(adns_state ads, const char *fn,
111 int lno, const char *buf) {
113 char addrbuf[ADNS_ADDR2TEXT_BUFLEN];
116 a.len= sizeof(a.addr);
117 err= adns_text2addr(buf,DNS_PORT, 0, &a.addr.sa,&a.len);
122 configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf);
125 configparseerr(ads,fn,lno,"failed to parse nameserver address `%s': %s",
129 adns__debug(ads,-1,0,"using nameserver %s",
130 adns__sockaddr_ntoa(&a.addr.sa, addrbuf));
131 addserver(ads,&a.addr.sa,a.len);
134 static void ccf_search(adns_state ads, const char *fn,
135 int lno, const char *buf) {
136 const char *bufp, *word;
137 char *newchars, **newptrs, **pp;
145 while (nextword(&bufp,&word,&l)) { count++; tl += l+1; }
147 newptrs= malloc(sizeof(char*)*count);
148 if (!newptrs) { saveerr(ads,errno); return; }
150 newchars= malloc(tl);
151 if (!newchars) { saveerr(ads,errno); free(newptrs); return; }
155 while (nextword(&bufp,&word,&l)) {
157 memcpy(newchars,word,l);
163 ads->nsearchlist= count;
164 ads->searchlist= newptrs;
167 static int gen_pton(const char *text, int want_af, adns_sockaddr *a) {
172 err= adns_text2addr(text,0, adns_qf_addrlit_scope_forbid,
174 if (err) { assert(err == EINVAL); return 0; }
175 if (want_af != AF_UNSPEC && a->sa.sa_family != want_af) return 0;
179 static void ccf_sortlist(adns_state ads, const char *fn,
180 int lno, const char *buf) {
182 char tbuf[200], *slash, *ep;
183 const char *maskwhat;
191 while (nextword(&buf,&word,&l)) {
192 if (ads->nsortlist >= MAXSORTLIST) {
193 adns__diag(ads,-1,0,"too many sortlist entries,"
194 " ignoring %.*s onwards",l,word);
198 if (l >= sizeof(tbuf)) {
199 configparseerr(ads,fn,lno,"sortlist entry `%.*s' too long",l,word);
203 memcpy(tbuf,word,l); tbuf[l]= 0;
204 slash= strchr(tbuf,'/');
205 if (slash) *slash++= 0;
207 sl= &ads->sortlist[ads->nsortlist];
208 if (!gen_pton(tbuf, AF_UNSPEC, &sl->base)) {
209 configparseerr(ads,fn,lno,"invalid address `%s' in sortlist",tbuf);
214 if (slash[strspn(slash, "0123456789")]) {
216 if (!gen_pton(slash, sl->base.sa.sa_family, &sl->mask)) {
217 configparseerr(ads,fn,lno,"invalid mask `%s' in sortlist",slash);
221 maskwhat = "prefix length";
222 initial= strtoul(slash,&ep,10);
223 if (*ep || initial>adns__addr_width(sl->base.sa.sa_family)) {
224 configparseerr(ads,fn,lno,"mask length `%s' invalid",slash);
227 sl->mask.sa.sa_family= sl->base.sa.sa_family;
228 adns__prefix_mask(&sl->mask, initial);
231 maskwhat = "implied prefix length";
232 initial= adns__guess_prefix_length(&sl->base);
234 configparseerr(ads,fn,lno, "network address `%s'"
235 " in sortlist is not in classed ranges,"
236 " must specify mask explicitly", tbuf);
239 sl->mask.sa.sa_family= sl->base.sa.sa_family;
240 adns__prefix_mask(&sl->mask, initial);
243 if (!adns__addr_matches(sl->base.sa.sa_family,
244 adns__sockaddr_addr(&sl->base.sa),
245 &sl->base,&sl->mask)) {
247 configparseerr(ads,fn,lno, "%s %d in sortlist"
248 " overlaps address `%s'",maskwhat,initial,tbuf);
250 configparseerr(ads,fn,lno, "%s `%s' in sortlist"
251 " overlaps address `%s'",maskwhat,slash,tbuf);
260 static void ccf_options(adns_state ads, const char *fn,
261 int lno, const char *buf) {
269 while (nextword(&buf,&word,&l)) {
270 if (l==5 && !memcmp(word,"debug",5)) {
271 ads->iflags |= adns_if_debug;
274 if (l>=6 && !memcmp(word,"ndots:",6)) {
275 v= strtoul(word+6,&ep,10);
276 if (l==6 || ep != word+l || v > INT_MAX) {
277 configparseerr(ads,fn,lno,"option `%.*s' malformed"
278 " or has bad value",l,word);
284 if (l>=12 && !memcmp(word,"adns_checkc:",12)) {
285 if (!strcmp(word+12,"none")) {
286 ads->iflags &= ~adns_if_checkc_freq;
287 ads->iflags |= adns_if_checkc_entex;
288 } else if (!strcmp(word+12,"entex")) {
289 ads->iflags &= ~adns_if_checkc_freq;
290 ads->iflags |= adns_if_checkc_entex;
291 } else if (!strcmp(word+12,"freq")) {
292 ads->iflags |= adns_if_checkc_freq;
294 configparseerr(ads,fn,lno, "option adns_checkc has bad value `%s' "
295 "(must be none, entex or freq", word+12);
299 if (l>=8 && !memcmp(word,"adns_af:",8)) {
301 ads->iflags &= ~adns_if_afmask;
302 if (strcmp(word,"any")) for (;;) {
303 i= strcspn(word,",");
304 if (i>=4 && !memcmp(word,"ipv4",4))
305 ads->iflags |= adns_if_permit_ipv4;
306 else if (i>=4 && !memcmp(word,"ipv6",4))
307 ads->iflags |= adns_if_permit_ipv6;
309 configparseerr(ads,fn,lno, "option adns_af has bad value `%.*s' "
310 "(must be `any' or list {`ipv4',`ipv6'},...)",
319 adns__diag(ads,-1,0,"%s:%d: unknown option `%.*s'", fn,lno, l,word);
323 static void ccf_clearnss(adns_state ads, const char *fn,
324 int lno, const char *buf) {
328 static void ccf_include(adns_state ads, const char *fn,
329 int lno, const char *buf) {
331 configparseerr(ads,fn,lno,"`include' directive with no filename");
334 readconfig(ads,buf,1);
337 static void ccf_lookup(adns_state ads, const char *fn, int lno,
344 configparseerr(ads,fn,lno,"`lookup' directive with no databases");
348 while (nextword(&buf,&word,&l)) {
349 if (l==4 && !memcmp(word,"bind",4)) {
351 } else if (l==4 && !memcmp(word,"file",4)) {
352 /* ignore this and hope /etc/hosts is not essential */
353 } else if (l==2 && !memcmp(word,"yp",2)) {
354 adns__diag(ads,-1,0,"%s:%d: yp lookups not supported by adns", fn,lno);
357 adns__diag(ads,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
363 adns__diag(ads,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn,lno);
366 static const struct configcommandinfo {
368 void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
369 } configcommandinfos[]= {
370 { "nameserver", ccf_nameserver },
371 { "domain", ccf_search },
372 { "search", ccf_search },
373 { "sortlist", ccf_sortlist },
374 { "options", ccf_options },
375 { "clearnameservers", ccf_clearnss },
376 { "include", ccf_include },
377 { "lookup", ccf_lookup }, /* OpenBSD */
386 static int gl_file(adns_state ads, getline_ctx *src_io, const char *filename,
387 int lno, char *buf, int buflen) {
388 FILE *file= src_io->file;
396 for (;;) { /* loop over chars */
398 adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
403 adns__diag(ads,-1,0,"%s:%d: line contains nul, ignored",filename,lno);
405 } else if (c == '\n') {
407 } else if (c == EOF) {
410 adns__diag(ads,-1,0,"%s:%d: read error: %s",
411 filename,lno,strerror(errno));
427 while ((c= getc(file)) != EOF && c != '\n');
431 static int gl_text(adns_state ads, getline_ctx *src_io, const char *filename,
432 int lno, char *buf, int buflen) {
433 const char *cp= src_io->text;
436 if (!cp || !*cp) return -1;
438 if (*cp == ';' || *cp == '\n') cp++;
439 l= strcspn(cp,";\n");
443 adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
453 static void readconfiggeneric(adns_state ads, const char *filename,
454 int (*getline)(adns_state ads, getline_ctx*,
455 const char *filename, int lno,
456 char *buf, int buflen),
457 /* Returns >=0 for success, -1 for EOF or error
458 * (error will have been reported), or -2 for
459 * bad line was encountered, try again.
461 getline_ctx gl_ctx) {
462 char linebuf[2000], *p, *q;
464 const struct configcommandinfo *ccip;
467 (l= getline(ads,&gl_ctx, filename,lno, linebuf,sizeof(linebuf))) != -1;
469 if (l == -2) continue;
470 while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
473 while (ctype_whitespace(*p)) p++;
474 if (*p == '#' || *p == ';' || !*p) continue;
476 while (*q && !ctype_whitespace(*q)) q++;
478 for (ccip=configcommandinfos;
480 !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p));
483 adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'",
484 filename,lno,(int)(q-p),p);
487 while (ctype_whitespace(*q)) q++;
488 ccip->fn(ads,filename,lno,q);
492 static const char *instrum_getenv(adns_state ads, const char *envvar) {
495 value= getenv(envvar);
496 if (!value) adns__debug(ads,-1,0,"environment variable %s not set",envvar);
497 else adns__debug(ads,-1,0,"environment variable %s"
498 " set to `%s'",envvar,value);
502 static void readconfig(adns_state ads, const char *filename, int warnmissing) {
505 gl_ctx.file= fopen(filename,"r");
507 if (errno == ENOENT) {
509 adns__debug(ads,-1,0, "configuration file"
510 " `%s' does not exist",filename);
514 adns__diag(ads,-1,0,"cannot open configuration file `%s': %s",
515 filename,strerror(errno));
519 readconfiggeneric(ads,filename,gl_file,gl_ctx);
524 static void readconfigtext(adns_state ads, const char *text,
525 const char *showname) {
529 readconfiggeneric(ads,showname,gl_text,gl_ctx);
532 static void readconfigenv(adns_state ads, const char *envvar) {
533 const char *filename;
535 if (ads->iflags & adns_if_noenv) {
536 adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
539 filename= instrum_getenv(ads,envvar);
540 if (filename) readconfig(ads,filename,1);
543 static void readconfigenvtext(adns_state ads, const char *envvar) {
544 const char *textdata;
546 if (ads->iflags & adns_if_noenv) {
547 adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
550 textdata= instrum_getenv(ads,envvar);
551 if (textdata) readconfigtext(ads,textdata,envvar);
555 int adns__setnonblock(adns_state ads, int fd) {
558 r= fcntl(fd,F_GETFL,0); if (r<0) return errno;
560 r= fcntl(fd,F_SETFL,r); if (r<0) return errno;
564 static int init_begin(adns_state *ads_r, adns_initflags flags,
565 adns_logcallbackfn *logfn, void *logfndata) {
569 ads= malloc(sizeof(*ads)); if (!ads) return errno;
573 ads->logfndata= logfndata;
575 LIST_INIT(ads->udpw);
576 LIST_INIT(ads->tcpw);
577 LIST_INIT(ads->childw);
578 LIST_INIT(ads->output);
579 LIST_INIT(ads->intdone);
584 adns__vbuf_init(&ads->tcpsend);
585 adns__vbuf_init(&ads->tcprecv);
586 ads->tcprecv_skip= 0;
587 ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0;
589 ads->tcpstate= server_disconnected;
590 timerclear(&ads->tcptimeout);
594 ads->rand48xsubi[0]= pid;
595 ads->rand48xsubi[1]= (unsigned long)pid >> 16;
596 ads->rand48xsubi[2]= pid ^ ((unsigned long)pid >> 16);
602 static int init_finish(adns_state ads) {
603 struct sockaddr_in sin;
604 struct protoent *proto;
605 struct udpsocket *udp;
609 if (!ads->nservers) {
610 if (ads->logfn && ads->iflags & adns_if_debug)
611 adns__lprintf(ads,"adns: no nameservers, using IPv4 localhost\n");
612 memset(&sin, 0, sizeof(sin));
613 sin.sin_family = AF_INET;
614 sin.sin_port = htons(DNS_PORT);
615 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
616 addserver(ads,(struct sockaddr *)&sin, sizeof(sin));
619 proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
621 for (i=0; i<ads->nservers; i++) {
622 if (adns__udpsocket_by_af(ads, ads->servers[i].addr.sa.sa_family))
624 assert(ads->nudpsockets < MAXUDP);
625 udp= &ads->udpsockets[ads->nudpsockets];
626 udp->af= ads->servers[i].addr.sa.sa_family;
627 udp->fd= socket(udp->af,SOCK_DGRAM,proto->p_proto);
628 if (udp->fd < 0) { r= errno; goto x_free; }
630 r= adns__setnonblock(ads,udp->fd);
631 if (r) { r= errno; goto x_closeudp; }
637 for (i=0; i<ads->nudpsockets; i++) close(ads->udpsockets[i].fd);
643 static void init_abort(adns_state ads) {
644 if (ads->nsearchlist) {
645 free(ads->searchlist[0]);
646 free(ads->searchlist);
651 static void logfn_file(adns_state ads, void *logfndata,
652 const char *fmt, va_list al) {
653 vfprintf(logfndata,fmt,al);
656 static int init_files(adns_state *ads_r, adns_initflags flags,
657 adns_logcallbackfn *logfn, void *logfndata) {
659 const char *res_options, *adns_res_options;
662 r= init_begin(&ads, flags, logfn, logfndata);
665 res_options= instrum_getenv(ads,"RES_OPTIONS");
666 adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
667 ccf_options(ads,"RES_OPTIONS",-1,res_options);
668 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
670 readconfig(ads,"/etc/resolv.conf",1);
671 readconfig(ads,"/etc/resolv-adns.conf",0);
672 readconfigenv(ads,"RES_CONF");
673 readconfigenv(ads,"ADNS_RES_CONF");
675 readconfigenvtext(ads,"RES_CONF_TEXT");
676 readconfigenvtext(ads,"ADNS_RES_CONF_TEXT");
678 ccf_options(ads,"RES_OPTIONS",-1,res_options);
679 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
681 ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
682 ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
684 if (ads->configerrno && ads->configerrno != EINVAL) {
693 adns__consistency(ads,0,cc_entex);
698 int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
699 return init_files(ads_r, flags, logfn_file, diagfile ? diagfile : stderr);
702 static int init_strcfg(adns_state *ads_r, adns_initflags flags,
703 adns_logcallbackfn *logfn, void *logfndata,
704 const char *configtext) {
708 r= init_begin(&ads, flags, logfn, logfndata);
711 readconfigtext(ads,configtext,"<supplied configuration text>");
712 if (ads->configerrno) {
718 r= init_finish(ads); if (r) return r;
719 adns__consistency(ads,0,cc_entex);
724 int adns_init_strcfg(adns_state *ads_r, adns_initflags flags,
725 FILE *diagfile, const char *configtext) {
726 return init_strcfg(ads_r, flags,
727 diagfile ? logfn_file : 0, diagfile,
731 int adns_init_logfn(adns_state *newstate_r, adns_initflags flags,
732 const char *configtext /*0=>use default config files*/,
733 adns_logcallbackfn *logfn /*0=>logfndata is a FILE* */,
734 void *logfndata /*0 with logfn==0 => discard*/) {
735 if (!logfn && logfndata)
738 return init_strcfg(newstate_r, flags, logfn, logfndata, configtext);
740 return init_files(newstate_r, flags, logfn, logfndata);
743 void adns_finish(adns_state ads) {
745 adns__consistency(ads,0,cc_entex);
747 if (ads->udpw.head) adns__cancel(ads->udpw.head);
748 else if (ads->tcpw.head) adns__cancel(ads->tcpw.head);
749 else if (ads->childw.head) adns__cancel(ads->childw.head);
750 else if (ads->output.head) adns__cancel(ads->output.head);
751 else if (ads->intdone.head) adns__cancel(ads->output.head);
754 for (i=0; i<ads->nudpsockets; i++) close(ads->udpsockets[i].fd);
755 if (ads->tcpsocket >= 0) close(ads->tcpsocket);
756 adns__vbuf_free(&ads->tcpsend);
757 adns__vbuf_free(&ads->tcprecv);
762 void adns_forallqueries_begin(adns_state ads) {
763 adns__consistency(ads,0,cc_entex);
765 ads->udpw.head ? ads->udpw.head :
766 ads->tcpw.head ? ads->tcpw.head :
767 ads->childw.head ? ads->childw.head :
771 adns_query adns_forallqueries_next(adns_state ads, void **context_r) {
774 adns__consistency(ads,0,cc_entex);
775 nqu= ads->forallnext;
781 } else if (qu == ads->udpw.tail) {
783 ads->tcpw.head ? ads->tcpw.head :
784 ads->childw.head ? ads->childw.head :
786 } else if (qu == ads->tcpw.tail) {
788 ads->childw.head ? ads->childw.head :
790 } else if (qu == ads->childw.tail) {
791 nqu= ads->output.head;
795 if (!qu->parent) break;
797 ads->forallnext= nqu;
798 if (context_r) *context_r= qu->ctx.ext;