3 * - configuration file parsing
4 * - management of global state
7 * This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
31 #include <arpa/inet.h>
35 static void readconfig(adns_state ads, const char *filename);
37 static void addserver(adns_state ads, struct in_addr addr) {
41 for (i=0; i<ads->nservers; i++) {
42 if (ads->servers[i].addr.s_addr == addr.s_addr) {
43 adns__debug(ads,-1,0,"duplicate nameserver %s ignored",inet_ntoa(addr));
48 if (ads->nservers>=MAXSERVERS) {
49 adns__diag(ads,-1,0,"too many nameservers, ignoring %s",inet_ntoa(addr));
53 ss= ads->servers+ads->nservers;
58 static void saveerr(adns_state ads, int en) {
59 if (!ads->configerrno) ads->configerrno= en;
62 static void configparseerr(adns_state ads, const char *fn, int lno,
63 const char *fmt, ...) {
67 if (!ads->diagfile || (ads->iflags & adns_if_noerrprint)) return;
69 if (lno==-1) fprintf(ads->diagfile,"adns: %s: ",fn);
70 else fprintf(ads->diagfile,"adns: %s:%d: ",fn,lno);
72 vfprintf(ads->diagfile,fmt,al);
74 fputc('\n',ads->diagfile);
77 static int nextword(const char **bufp_io, const char **word_r, int *l_r) {
81 while (ctype_whitespace(*p)) p++;
85 while (*q && !ctype_whitespace(*q)) q++;
94 static void ccf_nameserver(adns_state ads, const char *fn, int lno, const char *buf) {
97 if (!inet_aton(buf,&ia)) {
98 configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf);
101 adns__debug(ads,-1,0,"using nameserver %s",inet_ntoa(ia));
105 static void ccf_search(adns_state ads, const char *fn, int lno, const char *buf) {
106 const char *bufp, *word;
107 char *newchars, **newptrs, **pp;
115 while (nextword(&bufp,&word,&l)) { count++; tl += l+1; }
117 newptrs= malloc(sizeof(char*)*count); if (!newptrs) { saveerr(ads,errno); return; }
118 newchars= malloc(tl); if (!newchars) { saveerr(ads,errno); free(newptrs); return; }
122 while (nextword(&bufp,&word,&l)) {
124 memcpy(newchars,word,l);
129 free(ads->searchlist);
130 ads->nsearchlist= count;
131 ads->searchlist= newptrs;
132 /* fixme: actually pay attention */
135 static void ccf_sortlist(adns_state ads, const char *fn, int lno, const char *buf) {
137 char tbuf[200], *slash, *ep;
138 struct in_addr base, mask;
140 unsigned long initial, baselocal;
145 while (nextword(&buf,&word,&l)) {
146 if (ads->nsortlist >= MAXSORTLIST) {
147 adns__diag(ads,-1,0,"too many sortlist entries, ignoring %.*s onwards",l,word);
151 if (l >= sizeof(tbuf)) {
152 configparseerr(ads,fn,lno,"sortlist entry `%.*s' too long",l,word);
157 slash= strchr(tbuf,'/');
158 if (slash) *slash++= 0;
160 if (!inet_aton(tbuf,&base)) {
161 configparseerr(ads,fn,lno,"invalid address `%s' in sortlist",tbuf);
166 if (strchr(slash,'.')) {
167 if (!inet_aton(slash,&mask)) {
168 configparseerr(ads,fn,lno,"invalid mask `%s' in sortlist",slash);
171 if (base.s_addr & ~mask.s_addr) {
172 configparseerr(ads,fn,lno,
173 "mask `%s' in sortlist overlaps address `%s'",slash,tbuf);
177 initial= strtoul(slash,&ep,10);
178 if (*ep || initial>32) {
179 configparseerr(ads,fn,lno,"mask length `%s' invalid",slash);
182 mask.s_addr= htonl((0x0ffffffffUL) << (32-initial));
185 baselocal= ntohl(base.s_addr);
186 if (!baselocal & 0x080000000UL) /* class A */
187 mask.s_addr= htonl(0x0ff000000UL);
188 else if ((baselocal & 0x0c0000000UL) == 0x080000000UL)
189 mask.s_addr= htonl(0x0ffff0000UL); /* class B */
190 else if ((baselocal & 0x0f0000000UL) == 0x0e0000000UL)
191 mask.s_addr= htonl(0x0ff000000UL); /* class C */
193 configparseerr(ads,fn,lno,
194 "network address `%s' in sortlist is not in classed ranges,"
195 " must specify mask explicitly", tbuf);
200 ads->sortlist[ads->nsortlist].base= base;
201 ads->sortlist[ads->nsortlist].mask= mask;
206 static void ccf_options(adns_state ads, const char *fn, int lno, const char *buf) {
208 adns__diag(ads,-1,0,"warning - `options' ignored fixme");
211 static void ccf_clearnss(adns_state ads, const char *fn, int lno, const char *buf) {
215 static void ccf_include(adns_state ads, const char *fn, int lno, const char *buf) {
217 configparseerr(ads,fn,lno,"`include' directive with no filename");
223 static const struct configcommandinfo {
225 void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
226 } configcommandinfos[]= {
227 { "nameserver", ccf_nameserver },
228 { "domain", ccf_search },
229 { "search", ccf_search },
230 { "sortlist", ccf_sortlist },
231 { "options", ccf_options },
232 { "clearnameservers", ccf_clearnss },
233 { "include", ccf_include },
242 static int gl_file(adns_state ads, getline_ctx *src_io, const char *filename,
243 int lno, char *buf, int buflen) {
244 FILE *file= src_io->file;
252 for (;;) { /* loop over chars */
254 adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
259 adns__diag(ads,-1,0,"%s:%d: line contains nul, ignored",filename,lno);
261 } else if (c == '\n') {
263 } else if (c == EOF) {
266 adns__diag(ads,-1,0,"%s:%d: read error: %s",filename,lno,strerror(errno));
282 while ((c= getc(file)) != EOF && c != '\n');
286 static int gl_text(adns_state ads, getline_ctx *src_io, const char *filename,
287 int lno, char *buf, int buflen) {
288 const char *cp= src_io->text;
291 if (!cp || !*cp) return -1;
293 if (*cp == ';' || *cp == '\n') cp++;
294 l= strcspn(cp,";\n");
298 adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
308 static void readconfiggeneric(adns_state ads, const char *filename,
309 int (*getline)(adns_state ads, getline_ctx*,
310 const char *filename, int lno,
311 char *buf, int buflen),
312 /* Returns >=0 for success, -1 for EOF or error
313 * (error will have been reported), or -2 for
314 * bad line was encountered, try again.
316 getline_ctx gl_ctx) {
317 char linebuf[2000], *p, *q;
319 const struct configcommandinfo *ccip;
322 (l= getline(ads,&gl_ctx, filename,lno, linebuf,sizeof(linebuf))) != -1;
324 if (l == -2) continue;
325 while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
328 while (ctype_whitespace(*p)) p++;
329 if (*p == '#' || !*p) continue;
331 while (*q && !ctype_whitespace(*q)) q++;
333 for (ccip=configcommandinfos;
334 ccip->name && !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p));
337 adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'",
341 while (ctype_whitespace(*q)) q++;
342 ccip->fn(ads,filename,lno,q);
346 static const char *instrum_getenv(adns_state ads, const char *envvar) {
349 value= getenv(envvar);
350 if (!value) adns__debug(ads,-1,0,"environment variable %s not set",envvar);
351 else adns__debug(ads,-1,0,"environment variable %s set to `%s'",envvar,value);
355 static void readconfig(adns_state ads, const char *filename) {
358 gl_ctx.file= fopen(filename,"r");
360 if (errno == ENOENT) {
361 adns__debug(ads,-1,0,"configuration file `%s' does not exist",filename);
365 adns__diag(ads,-1,0,"cannot open configuration file `%s': %s",
366 filename,strerror(errno));
370 readconfiggeneric(ads,filename,gl_file,gl_ctx);
375 static void readconfigtext(adns_state ads, const char *text, const char *showname) {
379 readconfiggeneric(ads,showname,gl_text,gl_ctx);
382 static void readconfigenv(adns_state ads, const char *envvar) {
383 const char *filename;
385 if (ads->iflags & adns_if_noenv) {
386 adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
389 filename= instrum_getenv(ads,envvar);
390 if (filename) readconfig(ads,filename);
393 static void readconfigenvtext(adns_state ads, const char *envvar) {
394 const char *textdata;
396 if (ads->iflags & adns_if_noenv) {
397 adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
400 textdata= instrum_getenv(ads,envvar);
401 if (textdata) readconfigtext(ads,textdata,envvar);
405 int adns__setnonblock(adns_state ads, int fd) {
408 r= fcntl(fd,F_GETFL,0); if (r<0) return errno;
410 r= fcntl(fd,F_SETFL,r); if (r<0) return errno;
414 static int init_begin(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
417 ads= malloc(sizeof(*ads)); if (!ads) return errno;
420 ads->diagfile= diagfile;
421 LIST_INIT(ads->timew);
422 LIST_INIT(ads->childw);
423 LIST_INIT(ads->output);
425 ads->udpsocket= ads->tcpsocket= -1;
426 adns__vbuf_init(&ads->tcpsend);
427 adns__vbuf_init(&ads->tcprecv);
428 ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0;
429 ads->tcpstate= server_disconnected;
432 timerclear(&ads->tcptimeout);
438 static int init_finish(adns_state ads) {
440 struct protoent *proto;
443 if (!ads->nservers) {
444 if (ads->diagfile && ads->iflags & adns_if_debug)
445 fprintf(ads->diagfile,"adns: no nameservers, using localhost\n");
446 ia.s_addr= htonl(INADDR_LOOPBACK);
450 proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
451 ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto);
452 if (ads->udpsocket<0) { r= errno; goto x_free; }
454 r= adns__setnonblock(ads,ads->udpsocket);
455 if (r) { r= errno; goto x_closeudp; }
460 close(ads->udpsocket);
466 static void init_abort(adns_state ads) {
467 if (ads->nsearchlist) {
468 free(ads->searchlist[0]);
469 free(ads->searchlist);
474 int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
476 const char *res_options, *adns_res_options;
479 r= init_begin(&ads, flags, diagfile ? diagfile : stderr);
482 res_options= instrum_getenv(ads,"RES_OPTIONS");
483 adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
484 ccf_options(ads,"RES_OPTIONS",-1,res_options);
485 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
487 readconfig(ads,"/etc/resolv.conf");
488 readconfigenv(ads,"RES_CONF");
489 readconfigenv(ads,"ADNS_RES_CONF");
491 readconfigenvtext(ads,"RES_CONF_TEXT");
492 readconfigenvtext(ads,"ADNS_RES_CONF_TEXT");
494 ccf_options(ads,"RES_OPTIONS",-1,res_options);
495 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
497 ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
498 ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
500 if (ads->configerrno && ads->configerrno != EINVAL) {
513 int adns_init_strcfg(adns_state *ads_r, adns_initflags flags,
514 FILE *diagfile, const char *configtext) {
518 r= init_begin(&ads, flags, diagfile); if (r) return r;
520 readconfigtext(ads,configtext,"<supplied configuration text>");
521 if (ads->configerrno) {
527 r= init_finish(ads); if (r) return r;
532 void adns_finish(adns_state ads) {
534 if (ads->timew.head) adns_cancel(ads->timew.head);
535 else if (ads->childw.head) adns_cancel(ads->childw.head);
536 else if (ads->output.head) adns_cancel(ads->output.head);
539 close(ads->udpsocket);
540 if (ads->tcpsocket >= 0) close(ads->tcpsocket);
541 adns__vbuf_free(&ads->tcpsend);
542 adns__vbuf_free(&ads->tcprecv);