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, const struct sockaddr *sa, int n) {
47 const struct sockaddr_in *sin;
49 assert(sa->sa_family==AF_INET); assert(n>=sizeof(*sin));
50 sin= (const void *)sa;
52 for (i=0; i<ads->nservers; i++) {
53 assert(ads->servers[i].addr.sa.sa_family==AF_INET);
54 if (ads->servers[i].addr.inet.sin_addr.s_addr == sin->sin_addr.s_addr) {
55 adns__debug(ads,-1,0,"duplicate nameserver %s ignored",
56 inet_ntoa(sin->sin_addr));
61 if (ads->nservers>=MAXSERVERS) {
62 adns__diag(ads,-1,0,"too many nameservers, ignoring %s",
63 inet_ntoa(sin->sin_addr));
67 ss= ads->servers+ads->nservers;
68 assert(n <= sizeof(ss->addr));
70 memcpy(&ss->addr, sa, n);
74 static void freesearchlist(adns_state ads) {
75 if (ads->nsearchlist) free(*ads->searchlist);
76 free(ads->searchlist);
79 static void saveerr(adns_state ads, int en) {
80 if (!ads->configerrno) ads->configerrno= en;
83 static void configparseerr(adns_state ads, const char *fn, int lno,
84 const char *fmt, ...) {
88 if (!ads->logfn || (ads->iflags & adns_if_noerrprint)) return;
90 if (lno==-1) adns__lprintf(ads,"adns: %s: ",fn);
91 else adns__lprintf(ads,"adns: %s:%d: ",fn,lno);
93 adns__vlprintf(ads,fmt,al);
95 adns__lprintf(ads,"\n");
98 static int nextword(const char **bufp_io, const char **word_r, int *l_r) {
102 while (ctype_whitespace(*p)) p++;
106 while (*q && !ctype_whitespace(*q)) q++;
115 static void ccf_nameserver(adns_state ads, const char *fn,
116 int lno, const char *buf) {
117 struct sockaddr_in sin;
119 memset(&sin,0,sizeof(sin));
120 sin.sin_family= AF_INET;
121 sin.sin_port= htons(DNS_PORT);
122 if (!inet_aton(buf,&sin.sin_addr)) {
123 configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf);
126 adns__debug(ads,-1,0,"using nameserver %s",inet_ntoa(sin.sin_addr));
127 addserver(ads,(const struct sockaddr *)&sin,sizeof(sin));
130 static void ccf_search(adns_state ads, const char *fn,
131 int lno, const char *buf) {
132 const char *bufp, *word;
133 char *newchars, **newptrs, **pp;
141 while (nextword(&bufp,&word,&l)) { count++; tl += l+1; }
143 newptrs= malloc(sizeof(char*)*count);
144 if (!newptrs) { saveerr(ads,errno); return; }
146 newchars= malloc(tl);
147 if (!newchars) { saveerr(ads,errno); free(newptrs); return; }
151 while (nextword(&bufp,&word,&l)) {
153 memcpy(newchars,word,l);
159 ads->nsearchlist= count;
160 ads->searchlist= newptrs;
163 static void ccf_sortlist(adns_state ads, const char *fn,
164 int lno, const char *buf) {
166 char tbuf[200], *slash, *ep;
167 const char *maskwhat;
168 struct in_addr base, mask;
170 unsigned long initial, baselocal;
175 while (nextword(&buf,&word,&l)) {
176 if (ads->nsortlist >= MAXSORTLIST) {
177 adns__diag(ads,-1,0,"too many sortlist entries,"
178 " ignoring %.*s onwards",l,word);
182 if (l >= sizeof(tbuf)) {
183 configparseerr(ads,fn,lno,"sortlist entry `%.*s' too long",l,word);
187 memcpy(tbuf,word,l); tbuf[l]= 0;
188 slash= strchr(tbuf,'/');
189 if (slash) *slash++= 0;
191 if (!inet_aton(tbuf,&base)) {
192 configparseerr(ads,fn,lno,"invalid address `%s' in sortlist",tbuf);
197 if (strchr(slash,'.')) {
199 if (!inet_aton(slash,&mask)) {
200 configparseerr(ads,fn,lno,"invalid mask `%s' in sortlist",slash);
204 maskwhat = "prefix length";
205 initial= strtoul(slash,&ep,10);
206 if (*ep || initial>32) {
207 configparseerr(ads,fn,lno,"mask length `%s' invalid",slash);
210 mask.s_addr= htonl((0x0ffffffffUL) << (32-initial));
213 maskwhat = "implied mask";
214 baselocal= ntohl(base.s_addr);
215 if (!(baselocal & 0x080000000UL)) /* class A */
216 mask.s_addr= htonl(0x0ff000000UL);
217 else if ((baselocal & 0x0c0000000UL) == 0x080000000UL)
218 mask.s_addr= htonl(0x0ffff0000UL); /* class B */
219 else if ((baselocal & 0x0f0000000UL) == 0x0e0000000UL)
220 mask.s_addr= htonl(0x0ff000000UL); /* class C */
222 configparseerr(ads,fn,lno, "network address `%s'"
223 " in sortlist is not in classed ranges,"
224 " must specify mask explicitly", tbuf);
229 if (base.s_addr & ~mask.s_addr) {
230 configparseerr(ads,fn,lno, "%s `%s' in sortlist"
231 " overlaps address `%s'",maskwhat,
232 slash ? slash : inet_ntoa(mask), tbuf);
236 ads->sortlist[ads->nsortlist].af= AF_INET;
237 ads->sortlist[ads->nsortlist].base.v4= base;
238 ads->sortlist[ads->nsortlist].mask.v4= mask;
243 static void ccf_options(adns_state ads, const char *fn,
244 int lno, const char *buf) {
252 while (nextword(&buf,&word,&l)) {
253 if (l==5 && !memcmp(word,"debug",5)) {
254 ads->iflags |= adns_if_debug;
257 if (l>=6 && !memcmp(word,"ndots:",6)) {
258 v= strtoul(word+6,&ep,10);
259 if (l==6 || ep != word+l || v > INT_MAX) {
260 configparseerr(ads,fn,lno,"option `%.*s' malformed"
261 " or has bad value",l,word);
267 if (l>=12 && !memcmp(word,"adns_checkc:",12)) {
268 if (!strcmp(word+12,"none")) {
269 ads->iflags &= ~adns_if_checkc_freq;
270 ads->iflags |= adns_if_checkc_entex;
271 } else if (!strcmp(word+12,"entex")) {
272 ads->iflags &= ~adns_if_checkc_freq;
273 ads->iflags |= adns_if_checkc_entex;
274 } else if (!strcmp(word+12,"freq")) {
275 ads->iflags |= adns_if_checkc_freq;
277 configparseerr(ads,fn,lno, "option adns_checkc has bad value `%s' "
278 "(must be none, entex or freq", word+12);
282 adns__diag(ads,-1,0,"%s:%d: unknown option `%.*s'", fn,lno, l,word);
286 static void ccf_clearnss(adns_state ads, const char *fn,
287 int lno, const char *buf) {
291 static void ccf_include(adns_state ads, const char *fn,
292 int lno, const char *buf) {
294 configparseerr(ads,fn,lno,"`include' directive with no filename");
297 readconfig(ads,buf,1);
300 static void ccf_lookup(adns_state ads, const char *fn, int lno,
307 configparseerr(ads,fn,lno,"`lookup' directive with no databases");
311 while (nextword(&buf,&word,&l)) {
312 if (l==4 && !memcmp(word,"bind",4)) {
314 } else if (l==4 && !memcmp(word,"file",4)) {
315 /* ignore this and hope /etc/hosts is not essential */
316 } else if (l==2 && !memcmp(word,"yp",2)) {
317 adns__diag(ads,-1,0,"%s:%d: yp lookups not supported by adns", fn,lno);
320 adns__diag(ads,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
326 adns__diag(ads,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn,lno);
329 static const struct configcommandinfo {
331 void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
332 } configcommandinfos[]= {
333 { "nameserver", ccf_nameserver },
334 { "domain", ccf_search },
335 { "search", ccf_search },
336 { "sortlist", ccf_sortlist },
337 { "options", ccf_options },
338 { "clearnameservers", ccf_clearnss },
339 { "include", ccf_include },
340 { "lookup", ccf_lookup }, /* OpenBSD */
349 static int gl_file(adns_state ads, getline_ctx *src_io, const char *filename,
350 int lno, char *buf, int buflen) {
351 FILE *file= src_io->file;
359 for (;;) { /* loop over chars */
361 adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
366 adns__diag(ads,-1,0,"%s:%d: line contains nul, ignored",filename,lno);
368 } else if (c == '\n') {
370 } else if (c == EOF) {
373 adns__diag(ads,-1,0,"%s:%d: read error: %s",
374 filename,lno,strerror(errno));
390 while ((c= getc(file)) != EOF && c != '\n');
394 static int gl_text(adns_state ads, getline_ctx *src_io, const char *filename,
395 int lno, char *buf, int buflen) {
396 const char *cp= src_io->text;
399 if (!cp || !*cp) return -1;
401 if (*cp == ';' || *cp == '\n') cp++;
402 l= strcspn(cp,";\n");
406 adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
416 static void readconfiggeneric(adns_state ads, const char *filename,
417 int (*getline)(adns_state ads, getline_ctx*,
418 const char *filename, int lno,
419 char *buf, int buflen),
420 /* Returns >=0 for success, -1 for EOF or error
421 * (error will have been reported), or -2 for
422 * bad line was encountered, try again.
424 getline_ctx gl_ctx) {
425 char linebuf[2000], *p, *q;
427 const struct configcommandinfo *ccip;
430 (l= getline(ads,&gl_ctx, filename,lno, linebuf,sizeof(linebuf))) != -1;
432 if (l == -2) continue;
433 while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
436 while (ctype_whitespace(*p)) p++;
437 if (*p == '#' || *p == ';' || !*p) continue;
439 while (*q && !ctype_whitespace(*q)) q++;
441 for (ccip=configcommandinfos;
443 !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p));
446 adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'",
447 filename,lno,(int)(q-p),p);
450 while (ctype_whitespace(*q)) q++;
451 ccip->fn(ads,filename,lno,q);
455 static const char *instrum_getenv(adns_state ads, const char *envvar) {
458 value= getenv(envvar);
459 if (!value) adns__debug(ads,-1,0,"environment variable %s not set",envvar);
460 else adns__debug(ads,-1,0,"environment variable %s"
461 " set to `%s'",envvar,value);
465 static void readconfig(adns_state ads, const char *filename, int warnmissing) {
468 gl_ctx.file= fopen(filename,"r");
470 if (errno == ENOENT) {
472 adns__debug(ads,-1,0, "configuration file"
473 " `%s' does not exist",filename);
477 adns__diag(ads,-1,0,"cannot open configuration file `%s': %s",
478 filename,strerror(errno));
482 readconfiggeneric(ads,filename,gl_file,gl_ctx);
487 static void readconfigtext(adns_state ads, const char *text,
488 const char *showname) {
492 readconfiggeneric(ads,showname,gl_text,gl_ctx);
495 static void readconfigenv(adns_state ads, const char *envvar) {
496 const char *filename;
498 if (ads->iflags & adns_if_noenv) {
499 adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
502 filename= instrum_getenv(ads,envvar);
503 if (filename) readconfig(ads,filename,1);
506 static void readconfigenvtext(adns_state ads, const char *envvar) {
507 const char *textdata;
509 if (ads->iflags & adns_if_noenv) {
510 adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
513 textdata= instrum_getenv(ads,envvar);
514 if (textdata) readconfigtext(ads,textdata,envvar);
518 int adns__setnonblock(adns_state ads, int fd) {
521 r= fcntl(fd,F_GETFL,0); if (r<0) return errno;
523 r= fcntl(fd,F_SETFL,r); if (r<0) return errno;
527 static int init_begin(adns_state *ads_r, adns_initflags flags,
528 adns_logcallbackfn *logfn, void *logfndata) {
532 ads= malloc(sizeof(*ads)); if (!ads) return errno;
536 ads->logfndata= logfndata;
538 LIST_INIT(ads->udpw);
539 LIST_INIT(ads->tcpw);
540 LIST_INIT(ads->childw);
541 LIST_INIT(ads->output);
544 ads->udpsocket= ads->tcpsocket= -1;
545 adns__vbuf_init(&ads->tcpsend);
546 adns__vbuf_init(&ads->tcprecv);
547 ads->tcprecv_skip= 0;
548 ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0;
550 ads->tcpstate= server_disconnected;
551 timerclear(&ads->tcptimeout);
555 ads->rand48xsubi[0]= pid;
556 ads->rand48xsubi[1]= (unsigned long)pid >> 16;
557 ads->rand48xsubi[2]= pid ^ ((unsigned long)pid >> 16);
563 static int init_finish(adns_state ads) {
564 struct sockaddr_in sin;
565 struct protoent *proto;
568 if (!ads->nservers) {
569 if (ads->logfn && ads->iflags & adns_if_debug)
570 adns__lprintf(ads,"adns: no nameservers, using IPv4 localhost\n");
571 memset(&sin, 0, sizeof(sin));
572 sin.sin_family = AF_INET;
573 sin.sin_port = htons(DNS_PORT);
574 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
575 addserver(ads,(struct sockaddr *)&sin, sizeof(sin));
578 /* we can't cope with multiple transport address families yet */
579 for (i=0; i<ads->nservers; i++)
580 assert(ads->servers[i].addr.sa.sa_family==AF_INET);
582 proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
583 ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto);
584 if (ads->udpsocket<0) { r= errno; goto x_free; }
586 r= adns__setnonblock(ads,ads->udpsocket);
587 if (r) { r= errno; goto x_closeudp; }
592 close(ads->udpsocket);
598 static void init_abort(adns_state ads) {
599 if (ads->nsearchlist) {
600 free(ads->searchlist[0]);
601 free(ads->searchlist);
606 static void logfn_file(adns_state ads, void *logfndata,
607 const char *fmt, va_list al) {
608 vfprintf(logfndata,fmt,al);
611 static int init_files(adns_state *ads_r, adns_initflags flags,
612 adns_logcallbackfn *logfn, void *logfndata) {
614 const char *res_options, *adns_res_options;
617 r= init_begin(&ads, flags, logfn, logfndata);
620 res_options= instrum_getenv(ads,"RES_OPTIONS");
621 adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
622 ccf_options(ads,"RES_OPTIONS",-1,res_options);
623 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
625 readconfig(ads,"/etc/resolv.conf",1);
626 readconfig(ads,"/etc/resolv-adns.conf",0);
627 readconfigenv(ads,"RES_CONF");
628 readconfigenv(ads,"ADNS_RES_CONF");
630 readconfigenvtext(ads,"RES_CONF_TEXT");
631 readconfigenvtext(ads,"ADNS_RES_CONF_TEXT");
633 ccf_options(ads,"RES_OPTIONS",-1,res_options);
634 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
636 ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
637 ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
639 if (ads->configerrno && ads->configerrno != EINVAL) {
648 adns__consistency(ads,0,cc_entex);
653 int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
654 return init_files(ads_r, flags, logfn_file, diagfile ? diagfile : stderr);
657 static int init_strcfg(adns_state *ads_r, adns_initflags flags,
658 adns_logcallbackfn *logfn, void *logfndata,
659 const char *configtext) {
663 r= init_begin(&ads, flags, logfn, logfndata);
666 readconfigtext(ads,configtext,"<supplied configuration text>");
667 if (ads->configerrno) {
673 r= init_finish(ads); if (r) return r;
674 adns__consistency(ads,0,cc_entex);
679 int adns_init_strcfg(adns_state *ads_r, adns_initflags flags,
680 FILE *diagfile, const char *configtext) {
681 return init_strcfg(ads_r, flags,
682 diagfile ? logfn_file : 0, diagfile,
686 int adns_init_logfn(adns_state *newstate_r, adns_initflags flags,
687 const char *configtext /*0=>use default config files*/,
688 adns_logcallbackfn *logfn /*0=>logfndata is a FILE* */,
689 void *logfndata /*0 with logfn==0 => discard*/) {
690 if (!logfn && logfndata)
693 return init_strcfg(newstate_r, flags, logfn, logfndata, configtext);
695 return init_files(newstate_r, flags, logfn, logfndata);
698 void adns_finish(adns_state ads) {
699 adns__consistency(ads,0,cc_entex);
701 if (ads->udpw.head) adns_cancel(ads->udpw.head);
702 else if (ads->tcpw.head) adns_cancel(ads->tcpw.head);
703 else if (ads->childw.head) adns_cancel(ads->childw.head);
704 else if (ads->output.head) adns_cancel(ads->output.head);
707 close(ads->udpsocket);
708 if (ads->tcpsocket >= 0) close(ads->tcpsocket);
709 adns__vbuf_free(&ads->tcpsend);
710 adns__vbuf_free(&ads->tcprecv);
715 void adns_forallqueries_begin(adns_state ads) {
716 adns__consistency(ads,0,cc_entex);
718 ads->udpw.head ? ads->udpw.head :
719 ads->tcpw.head ? ads->tcpw.head :
720 ads->childw.head ? ads->childw.head :
724 adns_query adns_forallqueries_next(adns_state ads, void **context_r) {
727 adns__consistency(ads,0,cc_entex);
728 nqu= ads->forallnext;
734 } else if (qu == ads->udpw.tail) {
736 ads->tcpw.head ? ads->tcpw.head :
737 ads->childw.head ? ads->childw.head :
739 } else if (qu == ads->tcpw.tail) {
741 ads->childw.head ? ads->childw.head :
743 } else if (qu == ads->childw.tail) {
744 nqu= ads->output.head;
748 if (!qu->parent) break;
750 ads->forallnext= nqu;
751 if (context_r) *context_r= qu->ctx.ext;