Commit | Line | Data |
---|---|---|
e576be50 | 1 | /* |
2 | * setup.c | |
3 | * - configuration file parsing | |
4 | * - management of global state | |
5 | */ | |
6 | /* | |
ae8cc977 | 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.) | |
e576be50 | 12 | * |
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 | |
7f8bbe29 | 15 | * the Free Software Foundation; either version 3, or (at your option) |
e576be50 | 16 | * any later version. |
17 | * | |
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. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
8c09a4c6 | 24 | * along with this program; if not, write to the Free Software Foundation. |
e576be50 | 25 | */ |
656b2da9 | 26 | |
4353a5c4 | 27 | #include <stdlib.h> |
28 | #include <errno.h> | |
78bcc172 | 29 | #include <limits.h> |
4353a5c4 | 30 | #include <unistd.h> |
31 | #include <fcntl.h> | |
656b2da9 | 32 | |
5aabad0d | 33 | #include <sys/types.h> |
4353a5c4 | 34 | #include <netdb.h> |
71a6ff46 | 35 | #include <sys/socket.h> |
36 | #include <netinet/in.h> | |
4353a5c4 | 37 | #include <arpa/inet.h> |
38 | ||
39 | #include "internal.h" | |
40 | ||
fb7fbb66 | 41 | static void readconfig(adns_state ads, const char *filename, int warnmissing); |
36369543 | 42 | |
c32f3e30 | 43 | static void addserver(adns_state ads, const struct sockaddr *sa, int salen) { |
656b2da9 | 44 | int i; |
f930c455 | 45 | adns_rr_addr *ss; |
b0e8338a | 46 | char buf[ADNS_ADDR2TEXT_BUFLEN]; |
656b2da9 | 47 | |
48 | for (i=0; i<ads->nservers; i++) { | |
82ae109e | 49 | if (adns__sockaddrs_equal(sa, &ads->servers[i].addr.sa)) { |
f930c455 | 50 | adns__debug(ads,-1,0,"duplicate nameserver %s ignored", |
b0e8338a | 51 | adns__sockaddr_ntoa(sa, buf)); |
656b2da9 | 52 | return; |
53 | } | |
54 | } | |
55 | ||
56 | if (ads->nservers>=MAXSERVERS) { | |
f930c455 | 57 | adns__diag(ads,-1,0,"too many nameservers, ignoring %s", |
b0e8338a | 58 | adns__sockaddr_ntoa(sa, buf)); |
656b2da9 | 59 | return; |
60 | } | |
61 | ||
62 | ss= ads->servers+ads->nservers; | |
c32f3e30 IJ |
63 | assert(salen <= sizeof(ss->addr)); |
64 | ss->len = salen; | |
65 | memcpy(&ss->addr, sa, salen); | |
656b2da9 | 66 | ads->nservers++; |
67 | } | |
68 | ||
914a5ff5 | 69 | static void freesearchlist(adns_state ads) { |
70 | if (ads->nsearchlist) free(*ads->searchlist); | |
71 | free(ads->searchlist); | |
72 | } | |
73 | ||
36369543 | 74 | static void saveerr(adns_state ads, int en) { |
75 | if (!ads->configerrno) ads->configerrno= en; | |
76 | } | |
77 | ||
656b2da9 | 78 | static void configparseerr(adns_state ads, const char *fn, int lno, |
79 | const char *fmt, ...) { | |
80 | va_list al; | |
36369543 | 81 | |
82 | saveerr(ads,EINVAL); | |
d3a102c4 | 83 | if (!ads->logfn || (ads->iflags & adns_if_noerrprint)) return; |
36369543 | 84 | |
d3a102c4 | 85 | if (lno==-1) adns__lprintf(ads,"adns: %s: ",fn); |
86 | else adns__lprintf(ads,"adns: %s:%d: ",fn,lno); | |
656b2da9 | 87 | va_start(al,fmt); |
d3a102c4 | 88 | adns__vlprintf(ads,fmt,al); |
656b2da9 | 89 | va_end(al); |
d3a102c4 | 90 | adns__lprintf(ads,"\n"); |
656b2da9 | 91 | } |
92 | ||
32af6b2a | 93 | static int nextword(const char **bufp_io, const char **word_r, int *l_r) { |
94 | const char *p, *q; | |
95 | ||
96 | p= *bufp_io; | |
97 | while (ctype_whitespace(*p)) p++; | |
98 | if (!*p) return 0; | |
99 | ||
100 | q= p; | |
101 | while (*q && !ctype_whitespace(*q)) q++; | |
102 | ||
103 | *l_r= q-p; | |
104 | *word_r= p; | |
105 | *bufp_io= q; | |
106 | ||
107 | return 1; | |
108 | } | |
109 | ||
609133ee | 110 | static void ccf_nameserver(adns_state ads, const char *fn, |
111 | int lno, const char *buf) { | |
b0e8338a MW |
112 | adns_rr_addr a; |
113 | char addrbuf[ADNS_ADDR2TEXT_BUFLEN]; | |
114 | int err; | |
115 | ||
116 | a.len= sizeof(a.addr); | |
117 | err= adns_text2addr(buf,DNS_PORT, 0, &a.addr.sa,&a.len); | |
118 | switch (err) { | |
119 | case 0: | |
120 | break; | |
121 | case EINVAL: | |
656b2da9 | 122 | configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf); |
123 | return; | |
b0e8338a MW |
124 | default: |
125 | configparseerr(ads,fn,lno,"failed to parse nameserver address `%s': %s", | |
126 | buf,strerror(err)); | |
127 | return; | |
656b2da9 | 128 | } |
b0e8338a MW |
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); | |
656b2da9 | 132 | } |
133 | ||
609133ee | 134 | static void ccf_search(adns_state ads, const char *fn, |
135 | int lno, const char *buf) { | |
32af6b2a | 136 | const char *bufp, *word; |
137 | char *newchars, **newptrs, **pp; | |
138 | int count, tl, l; | |
139 | ||
656b2da9 | 140 | if (!buf) return; |
32af6b2a | 141 | |
142 | bufp= buf; | |
143 | count= 0; | |
144 | tl= 0; | |
145 | while (nextword(&bufp,&word,&l)) { count++; tl += l+1; } | |
146 | ||
609133ee | 147 | newptrs= malloc(sizeof(char*)*count); |
148 | if (!newptrs) { saveerr(ads,errno); return; } | |
149 | ||
150 | newchars= malloc(tl); | |
151 | if (!newchars) { saveerr(ads,errno); free(newptrs); return; } | |
32af6b2a | 152 | |
153 | bufp= buf; | |
154 | pp= newptrs; | |
155 | while (nextword(&bufp,&word,&l)) { | |
156 | *pp++= newchars; | |
157 | memcpy(newchars,word,l); | |
158 | newchars += l; | |
159 | *newchars++ = 0; | |
160 | } | |
161 | ||
914a5ff5 | 162 | freesearchlist(ads); |
32af6b2a | 163 | ads->nsearchlist= count; |
164 | ads->searchlist= newptrs; | |
656b2da9 | 165 | } |
166 | ||
82ae109e | 167 | static int gen_pton(const char *text, int want_af, adns_sockaddr *a) { |
b0e8338a | 168 | int err; |
82ae109e | 169 | int len; |
b0e8338a | 170 | |
82ae109e | 171 | len= sizeof(*a); |
b0e8338a | 172 | err= adns_text2addr(text,0, adns_qf_addrlit_scope_forbid, |
82ae109e | 173 | &a->sa, &len); |
b0e8338a | 174 | if (err) { assert(err == EINVAL); return 0; } |
82ae109e | 175 | if (want_af != AF_UNSPEC && a->sa.sa_family != want_af) return 0; |
b0e8338a MW |
176 | return 1; |
177 | } | |
178 | ||
609133ee | 179 | static void ccf_sortlist(adns_state ads, const char *fn, |
180 | int lno, const char *buf) { | |
32af6b2a | 181 | const char *word; |
09957b1c | 182 | char tbuf[200], *slash, *ep; |
95bee3e1 | 183 | const char *maskwhat; |
07554ccd | 184 | struct sortlist *sl; |
09957b1c | 185 | int l; |
07554ccd | 186 | int initial= -1; |
09957b1c | 187 | |
32af6b2a | 188 | if (!buf) return; |
189 | ||
09957b1c | 190 | ads->nsortlist= 0; |
32af6b2a | 191 | while (nextword(&buf,&word,&l)) { |
09957b1c | 192 | if (ads->nsortlist >= MAXSORTLIST) { |
609133ee | 193 | adns__diag(ads,-1,0,"too many sortlist entries," |
194 | " ignoring %.*s onwards",l,word); | |
09957b1c | 195 | return; |
196 | } | |
197 | ||
198 | if (l >= sizeof(tbuf)) { | |
32af6b2a | 199 | configparseerr(ads,fn,lno,"sortlist entry `%.*s' too long",l,word); |
09957b1c | 200 | continue; |
201 | } | |
202 | ||
78bcc172 | 203 | memcpy(tbuf,word,l); tbuf[l]= 0; |
09957b1c | 204 | slash= strchr(tbuf,'/'); |
205 | if (slash) *slash++= 0; | |
07554ccd MW |
206 | |
207 | sl= &ads->sortlist[ads->nsortlist]; | |
82ae109e | 208 | if (!gen_pton(tbuf, AF_UNSPEC, &sl->base)) { |
09957b1c | 209 | configparseerr(ads,fn,lno,"invalid address `%s' in sortlist",tbuf); |
210 | continue; | |
211 | } | |
212 | ||
213 | if (slash) { | |
07554ccd | 214 | if (slash[strspn(slash, "0123456789")]) { |
95bee3e1 | 215 | maskwhat = "mask"; |
82ae109e | 216 | if (!gen_pton(slash, sl->base.sa.sa_family, &sl->mask)) { |
09957b1c | 217 | configparseerr(ads,fn,lno,"invalid mask `%s' in sortlist",slash); |
218 | continue; | |
219 | } | |
09957b1c | 220 | } else { |
95bee3e1 | 221 | maskwhat = "prefix length"; |
09957b1c | 222 | initial= strtoul(slash,&ep,10); |
82ae109e | 223 | if (*ep || initial>adns__addr_width(sl->base.sa.sa_family)) { |
09957b1c | 224 | configparseerr(ads,fn,lno,"mask length `%s' invalid",slash); |
225 | continue; | |
226 | } | |
82ae109e IJ |
227 | sl->mask.sa.sa_family= sl->base.sa.sa_family; |
228 | adns__prefix_mask(&sl->mask, initial); | |
09957b1c | 229 | } |
230 | } else { | |
07554ccd | 231 | maskwhat = "implied prefix length"; |
82ae109e | 232 | initial= adns__guess_prefix_length(&sl->base); |
07554ccd | 233 | if (initial < 0) { |
609133ee | 234 | configparseerr(ads,fn,lno, "network address `%s'" |
235 | " in sortlist is not in classed ranges," | |
09957b1c | 236 | " must specify mask explicitly", tbuf); |
237 | continue; | |
238 | } | |
82ae109e IJ |
239 | sl->mask.sa.sa_family= sl->base.sa.sa_family; |
240 | adns__prefix_mask(&sl->mask, initial); | |
09957b1c | 241 | } |
242 | ||
82ae109e IJ |
243 | if (!adns__addr_matches(sl->base.sa.sa_family, |
244 | adns__sockaddr_addr(&sl->base.sa), | |
245 | &sl->base,&sl->mask)) { | |
07554ccd MW |
246 | if (initial >= 0) { |
247 | configparseerr(ads,fn,lno, "%s %d in sortlist" | |
248 | " overlaps address `%s'",maskwhat,initial,tbuf); | |
249 | } else { | |
250 | configparseerr(ads,fn,lno, "%s `%s' in sortlist" | |
251 | " overlaps address `%s'",maskwhat,slash,tbuf); | |
252 | } | |
95bee3e1 MW |
253 | continue; |
254 | } | |
255 | ||
09957b1c | 256 | ads->nsortlist++; |
257 | } | |
656b2da9 | 258 | } |
259 | ||
609133ee | 260 | static void ccf_options(adns_state ads, const char *fn, |
261 | int lno, const char *buf) { | |
78bcc172 | 262 | const char *word; |
263 | char *ep; | |
264 | unsigned long v; | |
138722f0 | 265 | int i,l; |
78bcc172 | 266 | |
656b2da9 | 267 | if (!buf) return; |
78bcc172 | 268 | |
269 | while (nextword(&buf,&word,&l)) { | |
270 | if (l==5 && !memcmp(word,"debug",5)) { | |
271 | ads->iflags |= adns_if_debug; | |
272 | continue; | |
273 | } | |
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) { | |
609133ee | 277 | configparseerr(ads,fn,lno,"option `%.*s' malformed" |
278 | " or has bad value",l,word); | |
78bcc172 | 279 | continue; |
280 | } | |
281 | ads->searchndots= v; | |
282 | continue; | |
283 | } | |
3e2e5fab | 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; | |
293 | } else { | |
294 | configparseerr(ads,fn,lno, "option adns_checkc has bad value `%s' " | |
295 | "(must be none, entex or freq", word+12); | |
296 | } | |
297 | continue; | |
298 | } | |
138722f0 MW |
299 | if (l>=8 && !memcmp(word,"adns_af:",8)) { |
300 | word += 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; | |
308 | else { | |
309 | configparseerr(ads,fn,lno, "option adns_af has bad value `%.*s' " | |
310 | "(must be `any' or list {`ipv4',`ipv6'},...)", | |
311 | i, word); | |
312 | break; | |
313 | } | |
314 | if (!word[i]) break; | |
315 | word= word + i + 1; | |
316 | } | |
317 | continue; | |
318 | } | |
78bcc172 | 319 | adns__diag(ads,-1,0,"%s:%d: unknown option `%.*s'", fn,lno, l,word); |
320 | } | |
656b2da9 | 321 | } |
322 | ||
609133ee | 323 | static void ccf_clearnss(adns_state ads, const char *fn, |
324 | int lno, const char *buf) { | |
656b2da9 | 325 | ads->nservers= 0; |
326 | } | |
327 | ||
609133ee | 328 | static void ccf_include(adns_state ads, const char *fn, |
329 | int lno, const char *buf) { | |
36369543 | 330 | if (!*buf) { |
331 | configparseerr(ads,fn,lno,"`include' directive with no filename"); | |
332 | return; | |
333 | } | |
fb7fbb66 | 334 | readconfig(ads,buf,1); |
36369543 | 335 | } |
336 | ||
0f15dd7b | 337 | static void ccf_lookup(adns_state ads, const char *fn, int lno, |
338 | const char *buf) { | |
339 | int found_bind=0; | |
340 | const char *word; | |
341 | int l; | |
342 | ||
343 | if (!*buf) { | |
344 | configparseerr(ads,fn,lno,"`lookup' directive with no databases"); | |
345 | return; | |
346 | } | |
347 | ||
348 | while (nextword(&buf,&word,&l)) { | |
349 | if (l==4 && !memcmp(word,"bind",4)) { | |
350 | found_bind=1; | |
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); | |
355 | found_bind=-1; | |
356 | } else { | |
357 | adns__diag(ads,-1,0,"%s:%d: unknown `lookup' database `%.*s'", | |
358 | fn,lno, l,word); | |
359 | found_bind=-1; | |
360 | } | |
361 | } | |
362 | if (!found_bind) | |
363 | adns__diag(ads,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn,lno); | |
364 | } | |
365 | ||
656b2da9 | 366 | static const struct configcommandinfo { |
367 | const char *name; | |
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 }, | |
36369543 | 376 | { "include", ccf_include }, |
0f15dd7b | 377 | { "lookup", ccf_lookup }, /* OpenBSD */ |
656b2da9 | 378 | { 0 } |
379 | }; | |
380 | ||
36369543 | 381 | typedef union { |
656b2da9 | 382 | FILE *file; |
36369543 | 383 | const char *text; |
384 | } getline_ctx; | |
656b2da9 | 385 | |
36369543 | 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; | |
389 | int c, i; | |
390 | char *p; | |
391 | ||
392 | p= buf; | |
393 | buflen--; | |
394 | i= 0; | |
395 | ||
396 | for (;;) { /* loop over chars */ | |
397 | if (i == buflen) { | |
398 | adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno); | |
399 | goto x_badline; | |
400 | } | |
401 | c= getc(file); | |
402 | if (!c) { | |
403 | adns__diag(ads,-1,0,"%s:%d: line contains nul, ignored",filename,lno); | |
404 | goto x_badline; | |
405 | } else if (c == '\n') { | |
406 | break; | |
407 | } else if (c == EOF) { | |
408 | if (ferror(file)) { | |
409 | saveerr(ads,errno); | |
609133ee | 410 | adns__diag(ads,-1,0,"%s:%d: read error: %s", |
411 | filename,lno,strerror(errno)); | |
36369543 | 412 | return -1; |
413 | } | |
414 | if (!i) return -1; | |
415 | break; | |
416 | } else { | |
417 | *p++= c; | |
418 | i++; | |
656b2da9 | 419 | } |
656b2da9 | 420 | } |
421 | ||
36369543 | 422 | *p++= 0; |
423 | return i; | |
424 | ||
425 | x_badline: | |
426 | saveerr(ads,EINVAL); | |
427 | while ((c= getc(file)) != EOF && c != '\n'); | |
428 | return -2; | |
429 | } | |
430 | ||
431 | static int gl_text(adns_state ads, getline_ctx *src_io, const char *filename, | |
432 | int lno, char *buf, int buflen) { | |
09957b1c | 433 | const char *cp= src_io->text; |
36369543 | 434 | int l; |
435 | ||
09957b1c | 436 | if (!cp || !*cp) return -1; |
36369543 | 437 | |
09957b1c | 438 | if (*cp == ';' || *cp == '\n') cp++; |
439 | l= strcspn(cp,";\n"); | |
440 | src_io->text = cp+l; | |
36369543 | 441 | |
442 | if (l >= buflen) { | |
443 | adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno); | |
444 | saveerr(ads,EINVAL); | |
445 | return -2; | |
446 | } | |
447 | ||
448 | memcpy(buf,cp,l); | |
449 | buf[l]= 0; | |
450 | return l; | |
451 | } | |
452 | ||
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. | |
460 | */ | |
461 | getline_ctx gl_ctx) { | |
462 | char linebuf[2000], *p, *q; | |
463 | int lno, l, dirl; | |
464 | const struct configcommandinfo *ccip; | |
465 | ||
466 | for (lno=1; | |
467 | (l= getline(ads,&gl_ctx, filename,lno, linebuf,sizeof(linebuf))) != -1; | |
468 | lno++) { | |
469 | if (l == -2) continue; | |
656b2da9 | 470 | while (l>0 && ctype_whitespace(linebuf[l-1])) l--; |
471 | linebuf[l]= 0; | |
472 | p= linebuf; | |
473 | while (ctype_whitespace(*p)) p++; | |
2d230487 | 474 | if (*p == '#' || *p == ';' || !*p) continue; |
656b2da9 | 475 | q= p; |
476 | while (*q && !ctype_whitespace(*q)) q++; | |
36369543 | 477 | dirl= q-p; |
656b2da9 | 478 | for (ccip=configcommandinfos; |
609133ee | 479 | ccip->name && |
480 | !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p)); | |
656b2da9 | 481 | ccip++); |
482 | if (!ccip->name) { | |
3955725c | 483 | adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'", |
0ca555c6 | 484 | filename,lno,(int)(q-p),p); |
656b2da9 | 485 | continue; |
486 | } | |
487 | while (ctype_whitespace(*q)) q++; | |
488 | ccip->fn(ads,filename,lno,q); | |
489 | } | |
656b2da9 | 490 | } |
491 | ||
492 | static const char *instrum_getenv(adns_state ads, const char *envvar) { | |
493 | const char *value; | |
494 | ||
495 | value= getenv(envvar); | |
3955725c | 496 | if (!value) adns__debug(ads,-1,0,"environment variable %s not set",envvar); |
609133ee | 497 | else adns__debug(ads,-1,0,"environment variable %s" |
498 | " set to `%s'",envvar,value); | |
656b2da9 | 499 | return value; |
500 | } | |
501 | ||
fb7fbb66 | 502 | static void readconfig(adns_state ads, const char *filename, int warnmissing) { |
36369543 | 503 | getline_ctx gl_ctx; |
504 | ||
505 | gl_ctx.file= fopen(filename,"r"); | |
506 | if (!gl_ctx.file) { | |
507 | if (errno == ENOENT) { | |
fb7fbb66 | 508 | if (warnmissing) |
609133ee | 509 | adns__debug(ads,-1,0, "configuration file" |
510 | " `%s' does not exist",filename); | |
36369543 | 511 | return; |
512 | } | |
513 | saveerr(ads,errno); | |
514 | adns__diag(ads,-1,0,"cannot open configuration file `%s': %s", | |
515 | filename,strerror(errno)); | |
516 | return; | |
517 | } | |
518 | ||
519 | readconfiggeneric(ads,filename,gl_file,gl_ctx); | |
520 | ||
521 | fclose(gl_ctx.file); | |
522 | } | |
523 | ||
609133ee | 524 | static void readconfigtext(adns_state ads, const char *text, |
525 | const char *showname) { | |
36369543 | 526 | getline_ctx gl_ctx; |
527 | ||
528 | gl_ctx.text= text; | |
529 | readconfiggeneric(ads,showname,gl_text,gl_ctx); | |
530 | } | |
531 | ||
656b2da9 | 532 | static void readconfigenv(adns_state ads, const char *envvar) { |
533 | const char *filename; | |
534 | ||
535 | if (ads->iflags & adns_if_noenv) { | |
3955725c | 536 | adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar); |
656b2da9 | 537 | return; |
538 | } | |
539 | filename= instrum_getenv(ads,envvar); | |
fb7fbb66 | 540 | if (filename) readconfig(ads,filename,1); |
656b2da9 | 541 | } |
4353a5c4 | 542 | |
09957b1c | 543 | static void readconfigenvtext(adns_state ads, const char *envvar) { |
544 | const char *textdata; | |
545 | ||
546 | if (ads->iflags & adns_if_noenv) { | |
547 | adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar); | |
548 | return; | |
549 | } | |
550 | textdata= instrum_getenv(ads,envvar); | |
551 | if (textdata) readconfigtext(ads,textdata,envvar); | |
552 | } | |
553 | ||
4353a5c4 | 554 | |
555 | int adns__setnonblock(adns_state ads, int fd) { | |
556 | int r; | |
656b2da9 | 557 | |
4353a5c4 | 558 | r= fcntl(fd,F_GETFL,0); if (r<0) return errno; |
559 | r |= O_NONBLOCK; | |
560 | r= fcntl(fd,F_SETFL,r); if (r<0) return errno; | |
561 | return 0; | |
562 | } | |
563 | ||
609133ee | 564 | static int init_begin(adns_state *ads_r, adns_initflags flags, |
d3a102c4 | 565 | adns_logcallbackfn *logfn, void *logfndata) { |
656b2da9 | 566 | adns_state ads; |
0e45654b | 567 | pid_t pid; |
656b2da9 | 568 | |
569 | ads= malloc(sizeof(*ads)); if (!ads) return errno; | |
36369543 | 570 | |
656b2da9 | 571 | ads->iflags= flags; |
d3a102c4 | 572 | ads->logfn= logfn; |
573 | ads->logfndata= logfndata; | |
d855b532 | 574 | ads->configerrno= 0; |
f7f83b4a | 575 | LIST_INIT(ads->udpw); |
576 | LIST_INIT(ads->tcpw); | |
4353a5c4 | 577 | LIST_INIT(ads->childw); |
578 | LIST_INIT(ads->output); | |
b582ca0f | 579 | LIST_INIT(ads->intdone); |
8ce38e76 | 580 | ads->forallnext= 0; |
4353a5c4 | 581 | ads->nextid= 0x311f; |
97a937c8 | 582 | ads->nudpsockets= 0; |
3eb20edd | 583 | ads->tcpsocket= -1; |
4353a5c4 | 584 | adns__vbuf_init(&ads->tcpsend); |
585 | adns__vbuf_init(&ads->tcprecv); | |
70ad7a2a | 586 | ads->tcprecv_skip= 0; |
32af6b2a | 587 | ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0; |
660d7d3b | 588 | ads->searchndots= 1; |
d855b532 | 589 | ads->tcpstate= server_disconnected; |
4353a5c4 | 590 | timerclear(&ads->tcptimeout); |
d855b532 | 591 | ads->searchlist= 0; |
656b2da9 | 592 | |
0e45654b | 593 | pid= getpid(); |
594 | ads->rand48xsubi[0]= pid; | |
595 | ads->rand48xsubi[1]= (unsigned long)pid >> 16; | |
596 | ads->rand48xsubi[2]= pid ^ ((unsigned long)pid >> 16); | |
597 | ||
36369543 | 598 | *ads_r= ads; |
599 | return 0; | |
600 | } | |
656b2da9 | 601 | |
36369543 | 602 | static int init_finish(adns_state ads) { |
f930c455 | 603 | struct sockaddr_in sin; |
36369543 | 604 | struct protoent *proto; |
3eb20edd | 605 | struct udpsocket *udp; |
27c763d5 | 606 | int i; |
3eb20edd | 607 | int r; |
36369543 | 608 | |
656b2da9 | 609 | if (!ads->nservers) { |
d3a102c4 | 610 | if (ads->logfn && ads->iflags & adns_if_debug) |
f930c455 MW |
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)); | |
656b2da9 | 617 | } |
618 | ||
619 | proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; } | |
97a937c8 | 620 | ads->nudpsockets= 0; |
3eb20edd MW |
621 | for (i=0; i<ads->nservers; i++) { |
622 | if (adns__udpsocket_by_af(ads, ads->servers[i].addr.sa.sa_family)) | |
623 | continue; | |
97a937c8 IJ |
624 | assert(ads->nudpsockets < MAXUDP); |
625 | udp= &ads->udpsockets[ads->nudpsockets]; | |
3eb20edd MW |
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; } | |
97a937c8 | 629 | ads->nudpsockets++; |
3eb20edd MW |
630 | r= adns__setnonblock(ads,udp->fd); |
631 | if (r) { r= errno; goto x_closeudp; } | |
632 | } | |
656b2da9 | 633 | |
656b2da9 | 634 | return 0; |
635 | ||
94436798 | 636 | x_closeudp: |
27c763d5 | 637 | for (i=0; i<ads->nudpsockets; i++) close(ads->udpsockets[i].fd); |
656b2da9 | 638 | x_free: |
639 | free(ads); | |
640 | return r; | |
641 | } | |
642 | ||
32af6b2a | 643 | static void init_abort(adns_state ads) { |
644 | if (ads->nsearchlist) { | |
645 | free(ads->searchlist[0]); | |
646 | free(ads->searchlist); | |
647 | } | |
648 | free(ads); | |
649 | } | |
650 | ||
d3a102c4 | 651 | static void logfn_file(adns_state ads, void *logfndata, |
652 | const char *fmt, va_list al) { | |
653 | vfprintf(logfndata,fmt,al); | |
654 | } | |
655 | ||
656 | static int init_files(adns_state *ads_r, adns_initflags flags, | |
657 | adns_logcallbackfn *logfn, void *logfndata) { | |
36369543 | 658 | adns_state ads; |
659 | const char *res_options, *adns_res_options; | |
660 | int r; | |
661 | ||
d3a102c4 | 662 | r= init_begin(&ads, flags, logfn, logfndata); |
36369543 | 663 | if (r) return r; |
664 | ||
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); | |
669 | ||
fb7fbb66 | 670 | readconfig(ads,"/etc/resolv.conf",1); |
671 | readconfig(ads,"/etc/resolv-adns.conf",0); | |
36369543 | 672 | readconfigenv(ads,"RES_CONF"); |
673 | readconfigenv(ads,"ADNS_RES_CONF"); | |
674 | ||
09957b1c | 675 | readconfigenvtext(ads,"RES_CONF_TEXT"); |
676 | readconfigenvtext(ads,"ADNS_RES_CONF_TEXT"); | |
677 | ||
36369543 | 678 | ccf_options(ads,"RES_OPTIONS",-1,res_options); |
679 | ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options); | |
680 | ||
681 | ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN")); | |
682 | ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN")); | |
683 | ||
32af6b2a | 684 | if (ads->configerrno && ads->configerrno != EINVAL) { |
685 | r= ads->configerrno; | |
686 | init_abort(ads); | |
687 | return r; | |
688 | } | |
689 | ||
36369543 | 690 | r= init_finish(ads); |
691 | if (r) return r; | |
692 | ||
28de6442 | 693 | adns__consistency(ads,0,cc_entex); |
36369543 | 694 | *ads_r= ads; |
695 | return 0; | |
696 | } | |
697 | ||
d3a102c4 | 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); | |
700 | } | |
701 | ||
702 | static int init_strcfg(adns_state *ads_r, adns_initflags flags, | |
703 | adns_logcallbackfn *logfn, void *logfndata, | |
704 | const char *configtext) { | |
36369543 | 705 | adns_state ads; |
706 | int r; | |
707 | ||
d3a102c4 | 708 | r= init_begin(&ads, flags, logfn, logfndata); |
709 | if (r) return r; | |
36369543 | 710 | |
711 | readconfigtext(ads,configtext,"<supplied configuration text>"); | |
712 | if (ads->configerrno) { | |
713 | r= ads->configerrno; | |
32af6b2a | 714 | init_abort(ads); |
36369543 | 715 | return r; |
716 | } | |
717 | ||
718 | r= init_finish(ads); if (r) return r; | |
28de6442 | 719 | adns__consistency(ads,0,cc_entex); |
36369543 | 720 | *ads_r= ads; |
721 | return 0; | |
722 | } | |
723 | ||
d3a102c4 | 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, | |
728 | configtext); | |
729 | } | |
730 | ||
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) | |
736 | logfn= logfn_file; | |
737 | if (configtext) | |
738 | return init_strcfg(newstate_r, flags, logfn, logfndata, configtext); | |
739 | else | |
740 | return init_files(newstate_r, flags, logfn, logfndata); | |
741 | } | |
3e2e5fab | 742 | |
9ec44266 | 743 | void adns_finish(adns_state ads) { |
3eb20edd | 744 | int i; |
28de6442 | 745 | adns__consistency(ads,0,cc_entex); |
9ec44266 | 746 | for (;;) { |
64aae7c8 IJ |
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); | |
b582ca0f | 751 | else if (ads->intdone.head) adns__cancel(ads->output.head); |
9ec44266 | 752 | else break; |
753 | } | |
97a937c8 | 754 | for (i=0; i<ads->nudpsockets; i++) close(ads->udpsockets[i].fd); |
9ec44266 | 755 | if (ads->tcpsocket >= 0) close(ads->tcpsocket); |
756 | adns__vbuf_free(&ads->tcpsend); | |
757 | adns__vbuf_free(&ads->tcprecv); | |
914a5ff5 | 758 | freesearchlist(ads); |
9ec44266 | 759 | free(ads); |
656b2da9 | 760 | } |
8ce38e76 | 761 | |
762 | void adns_forallqueries_begin(adns_state ads) { | |
28de6442 | 763 | adns__consistency(ads,0,cc_entex); |
8ce38e76 | 764 | ads->forallnext= |
f7f83b4a | 765 | ads->udpw.head ? ads->udpw.head : |
766 | ads->tcpw.head ? ads->tcpw.head : | |
8ce38e76 | 767 | ads->childw.head ? ads->childw.head : |
768 | ads->output.head; | |
769 | } | |
770 | ||
771 | adns_query adns_forallqueries_next(adns_state ads, void **context_r) { | |
772 | adns_query qu, nqu; | |
773 | ||
28de6442 | 774 | adns__consistency(ads,0,cc_entex); |
8ce38e76 | 775 | nqu= ads->forallnext; |
776 | for (;;) { | |
777 | qu= nqu; | |
778 | if (!qu) return 0; | |
4218fb9a | 779 | if (qu->next) { |
780 | nqu= qu->next; | |
f7f83b4a | 781 | } else if (qu == ads->udpw.tail) { |
782 | nqu= | |
783 | ads->tcpw.head ? ads->tcpw.head : | |
784 | ads->childw.head ? ads->childw.head : | |
785 | ads->output.head; | |
786 | } else if (qu == ads->tcpw.tail) { | |
787 | nqu= | |
788 | ads->childw.head ? ads->childw.head : | |
789 | ads->output.head; | |
4218fb9a | 790 | } else if (qu == ads->childw.tail) { |
791 | nqu= ads->output.head; | |
792 | } else { | |
793 | nqu= 0; | |
794 | } | |
8ce38e76 | 795 | if (!qu->parent) break; |
796 | } | |
797 | ads->forallnext= nqu; | |
798 | if (context_r) *context_r= qu->ctx.ext; | |
799 | return qu; | |
800 | } |