3 * - configuration file parsing
4 * - management of global state
8 * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
10 * It is part of adns, which is
11 * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
12 * Copyright (C) 1999-2000 Tony Finch <dot@dotat.at>
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
35 #include <sys/types.h>
37 #include <sys/socket.h>
38 #include <netinet/in.h>
39 #include <arpa/inet.h>
43 static void readconfig(adns_state ads, const char *filename, int warnmissing);
45 static void addserver(adns_state ads, struct in_addr addr) {
49 for (i=0; i<ads->nservers; i++) {
50 if (ads->servers[i].addr.s_addr == addr.s_addr) {
51 adns__debug(ads,-1,0,"duplicate nameserver %s ignored",inet_ntoa(addr));
56 if (ads->nservers>=MAXSERVERS) {
57 adns__diag(ads,-1,0,"too many nameservers, ignoring %s",inet_ntoa(addr));
61 ss= ads->servers+ads->nservers;
66 static void freesearchlist(adns_state ads) {
67 if (ads->nsearchlist) free(*ads->searchlist);
68 free(ads->searchlist);
71 static void saveerr(adns_state ads, int en) {
72 if (!ads->configerrno) ads->configerrno= en;
75 static void configparseerr(adns_state ads, const char *fn, int lno,
76 const char *fmt, ...) {
80 if (!ads->diagfile || (ads->iflags & adns_if_noerrprint)) return;
82 if (lno==-1) fprintf(ads->diagfile,"adns: %s: ",fn);
83 else fprintf(ads->diagfile,"adns: %s:%d: ",fn,lno);
85 vfprintf(ads->diagfile,fmt,al);
87 fputc('\n',ads->diagfile);
90 static int nextword(const char **bufp_io, const char **word_r, int *l_r) {
94 while (ctype_whitespace(*p)) p++;
98 while (*q && !ctype_whitespace(*q)) q++;
107 static void ccf_nameserver(adns_state ads, const char *fn, 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, int lno, const char *buf) {
119 const char *bufp, *word;
120 char *newchars, **newptrs, **pp;
128 while (nextword(&bufp,&word,&l)) { count++; tl += l+1; }
130 newptrs= malloc(sizeof(char*)*count); if (!newptrs) { saveerr(ads,errno); return; }
131 newchars= malloc(tl); if (!newchars) { saveerr(ads,errno); free(newptrs); return; }
135 while (nextword(&bufp,&word,&l)) {
137 memcpy(newchars,word,l);
143 ads->nsearchlist= count;
144 ads->searchlist= newptrs;
147 static void ccf_sortlist(adns_state ads, const char *fn, int lno, const char *buf) {
149 char tbuf[200], *slash, *ep;
150 struct in_addr base, mask;
152 unsigned long initial, baselocal;
157 while (nextword(&buf,&word,&l)) {
158 if (ads->nsortlist >= MAXSORTLIST) {
159 adns__diag(ads,-1,0,"too many sortlist entries, ignoring %.*s onwards",l,word);
163 if (l >= sizeof(tbuf)) {
164 configparseerr(ads,fn,lno,"sortlist entry `%.*s' too long",l,word);
168 memcpy(tbuf,word,l); tbuf[l]= 0;
169 slash= strchr(tbuf,'/');
170 if (slash) *slash++= 0;
172 if (!inet_aton(tbuf,&base)) {
173 configparseerr(ads,fn,lno,"invalid address `%s' in sortlist",tbuf);
178 if (strchr(slash,'.')) {
179 if (!inet_aton(slash,&mask)) {
180 configparseerr(ads,fn,lno,"invalid mask `%s' in sortlist",slash);
183 if (base.s_addr & ~mask.s_addr) {
184 configparseerr(ads,fn,lno,
185 "mask `%s' in sortlist overlaps address `%s'",slash,tbuf);
189 initial= strtoul(slash,&ep,10);
190 if (*ep || initial>32) {
191 configparseerr(ads,fn,lno,"mask length `%s' invalid",slash);
194 mask.s_addr= htonl((0x0ffffffffUL) << (32-initial));
197 baselocal= ntohl(base.s_addr);
198 if (!baselocal & 0x080000000UL) /* class A */
199 mask.s_addr= htonl(0x0ff000000UL);
200 else if ((baselocal & 0x0c0000000UL) == 0x080000000UL)
201 mask.s_addr= htonl(0x0ffff0000UL); /* class B */
202 else if ((baselocal & 0x0f0000000UL) == 0x0e0000000UL)
203 mask.s_addr= htonl(0x0ff000000UL); /* class C */
205 configparseerr(ads,fn,lno,
206 "network address `%s' in sortlist is not in classed ranges,"
207 " must specify mask explicitly", tbuf);
212 ads->sortlist[ads->nsortlist].base= base;
213 ads->sortlist[ads->nsortlist].mask= mask;
218 static void ccf_options(adns_state ads, const char *fn, int lno, const char *buf) {
226 while (nextword(&buf,&word,&l)) {
227 if (l==5 && !memcmp(word,"debug",5)) {
228 ads->iflags |= adns_if_debug;
231 if (l>=6 && !memcmp(word,"ndots:",6)) {
232 v= strtoul(word+6,&ep,10);
233 if (l==6 || ep != word+l || v > INT_MAX) {
234 configparseerr(ads,fn,lno,"option `%.*s' malformed or has bad value",l,word);
240 if (l>=12 && !memcmp(word,"adns_checkc:",12)) {
241 if (!strcmp(word+12,"none")) {
242 ads->iflags &= ~adns_if_checkc_freq;
243 ads->iflags |= adns_if_checkc_entex;
244 } else if (!strcmp(word+12,"entex")) {
245 ads->iflags &= ~adns_if_checkc_freq;
246 ads->iflags |= adns_if_checkc_entex;
247 } else if (!strcmp(word+12,"freq")) {
248 ads->iflags |= adns_if_checkc_freq;
250 configparseerr(ads,fn,lno, "option adns_checkc has bad value `%s' "
251 "(must be none, entex or freq", word+12);
255 adns__diag(ads,-1,0,"%s:%d: unknown option `%.*s'", fn,lno, l,word);
259 static void ccf_clearnss(adns_state ads, const char *fn, int lno, const char *buf) {
263 static void ccf_include(adns_state ads, const char *fn, int lno, const char *buf) {
265 configparseerr(ads,fn,lno,"`include' directive with no filename");
268 readconfig(ads,buf,1);
271 static void ccf_lookup(adns_state ads, const char *fn, int lno,
278 configparseerr(ads,fn,lno,"`lookup' directive with no databases");
282 while (nextword(&buf,&word,&l)) {
283 if (l==4 && !memcmp(word,"bind",4)) {
285 } else if (l==4 && !memcmp(word,"file",4)) {
286 /* ignore this and hope /etc/hosts is not essential */
287 } else if (l==2 && !memcmp(word,"yp",2)) {
288 adns__diag(ads,-1,0,"%s:%d: yp lookups not supported by adns", fn,lno);
291 adns__diag(ads,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
297 adns__diag(ads,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn,lno);
300 static const struct configcommandinfo {
302 void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
303 } configcommandinfos[]= {
304 { "nameserver", ccf_nameserver },
305 { "domain", ccf_search },
306 { "search", ccf_search },
307 { "sortlist", ccf_sortlist },
308 { "options", ccf_options },
309 { "clearnameservers", ccf_clearnss },
310 { "include", ccf_include },
311 { "lookup", ccf_lookup }, /* OpenBSD */
320 static int gl_file(adns_state ads, getline_ctx *src_io, const char *filename,
321 int lno, char *buf, int buflen) {
322 FILE *file= src_io->file;
330 for (;;) { /* loop over chars */
332 adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
337 adns__diag(ads,-1,0,"%s:%d: line contains nul, ignored",filename,lno);
339 } else if (c == '\n') {
341 } else if (c == EOF) {
344 adns__diag(ads,-1,0,"%s:%d: read error: %s",filename,lno,strerror(errno));
360 while ((c= getc(file)) != EOF && c != '\n');
364 static int gl_text(adns_state ads, getline_ctx *src_io, const char *filename,
365 int lno, char *buf, int buflen) {
366 const char *cp= src_io->text;
369 if (!cp || !*cp) return -1;
371 if (*cp == ';' || *cp == '\n') cp++;
372 l= strcspn(cp,";\n");
376 adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
386 static void readconfiggeneric(adns_state ads, const char *filename,
387 int (*getline)(adns_state ads, getline_ctx*,
388 const char *filename, int lno,
389 char *buf, int buflen),
390 /* Returns >=0 for success, -1 for EOF or error
391 * (error will have been reported), or -2 for
392 * bad line was encountered, try again.
394 getline_ctx gl_ctx) {
395 char linebuf[2000], *p, *q;
397 const struct configcommandinfo *ccip;
400 (l= getline(ads,&gl_ctx, filename,lno, linebuf,sizeof(linebuf))) != -1;
402 if (l == -2) continue;
403 while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
406 while (ctype_whitespace(*p)) p++;
407 if (*p == '#' || !*p) continue;
409 while (*q && !ctype_whitespace(*q)) q++;
411 for (ccip=configcommandinfos;
412 ccip->name && !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p));
415 adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'",
419 while (ctype_whitespace(*q)) q++;
420 ccip->fn(ads,filename,lno,q);
424 static const char *instrum_getenv(adns_state ads, const char *envvar) {
427 value= getenv(envvar);
428 if (!value) adns__debug(ads,-1,0,"environment variable %s not set",envvar);
429 else adns__debug(ads,-1,0,"environment variable %s set to `%s'",envvar,value);
433 static void readconfig(adns_state ads, const char *filename, int warnmissing) {
436 gl_ctx.file= fopen(filename,"r");
438 if (errno == ENOENT) {
440 adns__debug(ads,-1,0,"configuration file `%s' does not exist",filename);
444 adns__diag(ads,-1,0,"cannot open configuration file `%s': %s",
445 filename,strerror(errno));
449 readconfiggeneric(ads,filename,gl_file,gl_ctx);
454 static void readconfigtext(adns_state ads, const char *text, const char *showname) {
458 readconfiggeneric(ads,showname,gl_text,gl_ctx);
461 static void readconfigenv(adns_state ads, const char *envvar) {
462 const char *filename;
464 if (ads->iflags & adns_if_noenv) {
465 adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
468 filename= instrum_getenv(ads,envvar);
469 if (filename) readconfig(ads,filename,1);
472 static void readconfigenvtext(adns_state ads, const char *envvar) {
473 const char *textdata;
475 if (ads->iflags & adns_if_noenv) {
476 adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
479 textdata= instrum_getenv(ads,envvar);
480 if (textdata) readconfigtext(ads,textdata,envvar);
484 int adns__setnonblock(adns_state ads, int fd) {
487 r= fcntl(fd,F_GETFL,0); if (r<0) return errno;
489 r= fcntl(fd,F_SETFL,r); if (r<0) return errno;
493 static int init_begin(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
496 ads= malloc(sizeof(*ads)); if (!ads) return errno;
499 ads->diagfile= diagfile;
501 LIST_INIT(ads->udpw);
502 LIST_INIT(ads->tcpw);
503 LIST_INIT(ads->childw);
504 LIST_INIT(ads->output);
507 ads->udpsocket= ads->tcpsocket= -1;
508 adns__vbuf_init(&ads->tcpsend);
509 adns__vbuf_init(&ads->tcprecv);
510 ads->tcprecv_skip= 0;
511 ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0;
513 ads->tcpstate= server_disconnected;
514 timerclear(&ads->tcptimeout);
521 static int init_finish(adns_state ads) {
523 struct protoent *proto;
526 if (!ads->nservers) {
527 if (ads->diagfile && ads->iflags & adns_if_debug)
528 fprintf(ads->diagfile,"adns: no nameservers, using localhost\n");
529 ia.s_addr= htonl(INADDR_LOOPBACK);
533 proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
534 ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto);
535 if (ads->udpsocket<0) { r= errno; goto x_free; }
537 r= adns__setnonblock(ads,ads->udpsocket);
538 if (r) { r= errno; goto x_closeudp; }
543 close(ads->udpsocket);
549 static void init_abort(adns_state ads) {
550 if (ads->nsearchlist) {
551 free(ads->searchlist[0]);
552 free(ads->searchlist);
557 int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
559 const char *res_options, *adns_res_options;
562 r= init_begin(&ads, flags, diagfile ? diagfile : stderr);
565 res_options= instrum_getenv(ads,"RES_OPTIONS");
566 adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
567 ccf_options(ads,"RES_OPTIONS",-1,res_options);
568 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
570 readconfig(ads,"/etc/resolv.conf",1);
571 readconfig(ads,"/etc/resolv-adns.conf",0);
572 readconfigenv(ads,"RES_CONF");
573 readconfigenv(ads,"ADNS_RES_CONF");
575 readconfigenvtext(ads,"RES_CONF_TEXT");
576 readconfigenvtext(ads,"ADNS_RES_CONF_TEXT");
578 ccf_options(ads,"RES_OPTIONS",-1,res_options);
579 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
581 ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
582 ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
584 if (ads->configerrno && ads->configerrno != EINVAL) {
593 adns__consistency(ads,0,cc_entex);
598 int adns_init_strcfg(adns_state *ads_r, adns_initflags flags,
599 FILE *diagfile, const char *configtext) {
603 r= init_begin(&ads, flags, diagfile); if (r) return r;
605 readconfigtext(ads,configtext,"<supplied configuration text>");
606 if (ads->configerrno) {
612 r= init_finish(ads); if (r) return r;
613 adns__consistency(ads,0,cc_entex);
619 void adns_finish(adns_state ads) {
620 adns__consistency(ads,0,cc_entex);
622 if (ads->udpw.head) adns_cancel(ads->udpw.head);
623 else if (ads->tcpw.head) adns_cancel(ads->tcpw.head);
624 else if (ads->childw.head) adns_cancel(ads->childw.head);
625 else if (ads->output.head) adns_cancel(ads->output.head);
628 close(ads->udpsocket);
629 if (ads->tcpsocket >= 0) close(ads->tcpsocket);
630 adns__vbuf_free(&ads->tcpsend);
631 adns__vbuf_free(&ads->tcprecv);
636 void adns_forallqueries_begin(adns_state ads) {
637 adns__consistency(ads,0,cc_entex);
639 ads->udpw.head ? ads->udpw.head :
640 ads->tcpw.head ? ads->tcpw.head :
641 ads->childw.head ? ads->childw.head :
645 adns_query adns_forallqueries_next(adns_state ads, void **context_r) {
648 adns__consistency(ads,0,cc_entex);
649 nqu= ads->forallnext;
655 } else if (qu == ads->udpw.tail) {
657 ads->tcpw.head ? ads->tcpw.head :
658 ads->childw.head ? ads->childw.head :
660 } else if (qu == ads->tcpw.tail) {
662 ads->childw.head ? ads->childw.head :
664 } else if (qu == ads->childw.tail) {
665 nqu= ads->output.head;
669 if (!qu->parent) break;
671 ads->forallnext= nqu;
672 if (context_r) *context_r= qu->ctx.ext;