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Commit | Line | Data |
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28f540f4 RM |
1 | /* |
2 | * ++Copyright++ 1985, 1988, 1993 | |
3 | * - | |
4 | * Copyright (c) 1985, 1988, 1993 | |
5 | * The Regents of the University of California. All rights reserved. | |
fa0bc87c | 6 | * |
28f540f4 RM |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * 1. Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions and the following disclaimer. | |
12 | * 2. Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in the | |
14 | * documentation and/or other materials provided with the distribution. | |
28f540f4 RM |
15 | * 4. Neither the name of the University nor the names of its contributors |
16 | * may be used to endorse or promote products derived from this software | |
17 | * without specific prior written permission. | |
fa0bc87c | 18 | * |
28f540f4 RM |
19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
29 | * SUCH DAMAGE. | |
30 | * - | |
31 | * Portions Copyright (c) 1993 by Digital Equipment Corporation. | |
fa0bc87c | 32 | * |
28f540f4 RM |
33 | * Permission to use, copy, modify, and distribute this software for any |
34 | * purpose with or without fee is hereby granted, provided that the above | |
35 | * copyright notice and this permission notice appear in all copies, and that | |
36 | * the name of Digital Equipment Corporation not be used in advertising or | |
37 | * publicity pertaining to distribution of the document or software without | |
38 | * specific, written prior permission. | |
fa0bc87c | 39 | * |
28f540f4 RM |
40 | * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL |
41 | * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES | |
42 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT | |
43 | * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL | |
44 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR | |
45 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS | |
46 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
47 | * SOFTWARE. | |
48 | * - | |
49 | * --Copyright-- | |
50 | */ | |
51 | ||
e1e041c4 SP |
52 | /* XXX This file is not used by any of the resolver functions implemented by |
53 | glibc (i.e. get*info and gethostby*). It cannot be removed however because | |
54 | it exports symbols in the libresolv ABI. The file is not maintained any | |
55 | more, nor are these functions. */ | |
56 | ||
e7eceec0 FW |
57 | #include <shlib-compat.h> |
58 | #if SHLIB_COMPAT (libresolv, GLIBC_2_0, GLIBC_2_25) | |
59 | ||
60 | # include <sys/types.h> | |
61 | # include <sys/param.h> | |
62 | # include <sys/socket.h> | |
63 | # include <netinet/in.h> | |
64 | # include <arpa/inet.h> | |
65 | # include <arpa/nameser.h> | |
66 | ||
67 | # include <stdio.h> | |
68 | # include <netdb.h> | |
b76e0659 | 69 | # include <resolv/resolv-internal.h> |
352f4ff9 | 70 | # include <resolv/resolv_context.h> |
e7eceec0 FW |
71 | # include <ctype.h> |
72 | # include <errno.h> | |
73 | # include <stdlib.h> | |
74 | # include <string.h> | |
75 | ||
76 | # define MAXALIASES 35 | |
77 | # define MAXADDRS 35 | |
28f540f4 | 78 | |
28f540f4 RM |
79 | static char *h_addr_ptrs[MAXADDRS + 1]; |
80 | ||
81 | static struct hostent host; | |
82 | static char *host_aliases[MAXALIASES]; | |
5f0e6fc7 | 83 | static char hostbuf[8*1024]; |
fa0bc87c | 84 | static u_char host_addr[16]; /* IPv4 or IPv6 */ |
28f540f4 RM |
85 | static FILE *hostf = NULL; |
86 | static int stayopen = 0; | |
87 | ||
352f4ff9 FW |
88 | static struct hostent *res_gethostbyname2_context (struct resolv_context *, |
89 | const char *name, int af); | |
90 | ||
79937577 UD |
91 | static void map_v4v6_address (const char *src, char *dst) __THROW; |
92 | static void map_v4v6_hostent (struct hostent *hp, char **bp, int *len) __THROW; | |
fa0bc87c | 93 | |
79937577 | 94 | extern void addrsort (char **, int) __THROW; |
28f540f4 | 95 | |
e7eceec0 FW |
96 | # if PACKETSZ > 65536 |
97 | # define MAXPACKET PACKETSZ | |
98 | # else | |
99 | # define MAXPACKET 65536 | |
100 | # endif | |
28f540f4 | 101 | |
1522c368 | 102 | /* As per RFC 1034 and 1035 a host name cannot exceed 255 octets in length. */ |
e7eceec0 FW |
103 | # ifdef MAXHOSTNAMELEN |
104 | # undef MAXHOSTNAMELEN | |
105 | # endif | |
106 | # define MAXHOSTNAMELEN 256 | |
1522c368 | 107 | |
28f540f4 RM |
108 | typedef union { |
109 | HEADER hdr; | |
110 | u_char buf[MAXPACKET]; | |
111 | } querybuf; | |
112 | ||
113 | typedef union { | |
114 | int32_t al; | |
115 | char ac; | |
116 | } align; | |
117 | ||
e7eceec0 | 118 | # ifndef h_errno |
28f540f4 | 119 | extern int h_errno; |
e7eceec0 | 120 | # endif |
28f540f4 | 121 | |
e7eceec0 | 122 | # define BOUNDED_INCR(x) \ |
66715f83 UD |
123 | do { \ |
124 | cp += x; \ | |
125 | if (cp > eom) { \ | |
126 | __set_h_errno (NO_RECOVERY); \ | |
127 | return (NULL); \ | |
128 | } \ | |
129 | } while (0) | |
130 | ||
e7eceec0 | 131 | # define BOUNDS_CHECK(ptr, count) \ |
66715f83 UD |
132 | do { \ |
133 | if ((ptr) + (count) > eom) { \ | |
134 | __set_h_errno (NO_RECOVERY); \ | |
135 | return (NULL); \ | |
136 | } \ | |
137 | } while (0) | |
138 | ||
139 | ||
28f540f4 | 140 | static struct hostent * |
db0a00d3 | 141 | getanswer (const querybuf *answer, int anslen, const char *qname, int qtype) |
28f540f4 | 142 | { |
2e09a79a JM |
143 | const HEADER *hp; |
144 | const u_char *cp; | |
145 | int n; | |
66715f83 | 146 | const u_char *eom, *erdata; |
28f540f4 RM |
147 | char *bp, **ap, **hap; |
148 | int type, class, buflen, ancount, qdcount; | |
149 | int haveanswer, had_error; | |
845dcb57 | 150 | char tbuf[MAXDNAME]; |
3cf595e5 | 151 | const char *tname; |
0cf12a6a | 152 | int (*name_ok) (const char *); |
28f540f4 | 153 | |
3cf595e5 | 154 | tname = qname; |
28f540f4 RM |
155 | host.h_name = NULL; |
156 | eom = answer->buf + anslen; | |
55707265 RM |
157 | switch (qtype) { |
158 | case T_A: | |
fa0bc87c | 159 | case T_AAAA: |
55707265 RM |
160 | name_ok = res_hnok; |
161 | break; | |
162 | case T_PTR: | |
fa0bc87c | 163 | name_ok = res_dnok; |
55707265 RM |
164 | break; |
165 | default: | |
fa0bc87c | 166 | return (NULL); /* XXX should be abort(); */ |
55707265 | 167 | } |
28f540f4 RM |
168 | /* |
169 | * find first satisfactory answer | |
170 | */ | |
171 | hp = &answer->hdr; | |
172 | ancount = ntohs(hp->ancount); | |
173 | qdcount = ntohs(hp->qdcount); | |
174 | bp = hostbuf; | |
175 | buflen = sizeof hostbuf; | |
66715f83 UD |
176 | cp = answer->buf; |
177 | BOUNDED_INCR(HFIXEDSZ); | |
28f540f4 | 178 | if (qdcount != 1) { |
a68b0d31 | 179 | __set_h_errno (NO_RECOVERY); |
28f540f4 RM |
180 | return (NULL); |
181 | } | |
55707265 RM |
182 | n = dn_expand(answer->buf, eom, cp, bp, buflen); |
183 | if ((n < 0) || !(*name_ok)(bp)) { | |
a68b0d31 | 184 | __set_h_errno (NO_RECOVERY); |
28f540f4 RM |
185 | return (NULL); |
186 | } | |
66715f83 | 187 | BOUNDED_INCR(n + QFIXEDSZ); |
fa0bc87c | 188 | if (qtype == T_A || qtype == T_AAAA) { |
28f540f4 RM |
189 | /* res_send() has already verified that the query name is the |
190 | * same as the one we sent; this just gets the expanded name | |
191 | * (i.e., with the succeeding search-domain tacked on). | |
192 | */ | |
193 | n = strlen(bp) + 1; /* for the \0 */ | |
76b87c03 UD |
194 | if (n >= MAXHOSTNAMELEN) { |
195 | __set_h_errno (NO_RECOVERY); | |
196 | return (NULL); | |
197 | } | |
28f540f4 RM |
198 | host.h_name = bp; |
199 | bp += n; | |
200 | buflen -= n; | |
201 | /* The qname can be abbreviated, but h_name is now absolute. */ | |
202 | qname = host.h_name; | |
203 | } | |
204 | ap = host_aliases; | |
205 | *ap = NULL; | |
206 | host.h_aliases = host_aliases; | |
207 | hap = h_addr_ptrs; | |
208 | *hap = NULL; | |
28f540f4 | 209 | host.h_addr_list = h_addr_ptrs; |
28f540f4 RM |
210 | haveanswer = 0; |
211 | had_error = 0; | |
212 | while (ancount-- > 0 && cp < eom && !had_error) { | |
213 | n = dn_expand(answer->buf, eom, cp, bp, buflen); | |
55707265 | 214 | if ((n < 0) || !(*name_ok)(bp)) { |
28f540f4 RM |
215 | had_error++; |
216 | continue; | |
217 | } | |
218 | cp += n; /* name */ | |
66715f83 | 219 | BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ); |
b43b13ac | 220 | type = ns_get16(cp); |
16b66062 | 221 | cp += INT16SZ; /* type */ |
b43b13ac | 222 | class = ns_get16(cp); |
16b66062 | 223 | cp += INT16SZ + INT32SZ; /* class, TTL */ |
b43b13ac | 224 | n = ns_get16(cp); |
28f540f4 | 225 | cp += INT16SZ; /* len */ |
66715f83 UD |
226 | BOUNDS_CHECK(cp, n); |
227 | erdata = cp + n; | |
fa0bc87c | 228 | if (class != C_IN) { |
28f540f4 RM |
229 | /* XXX - debug? syslog? */ |
230 | cp += n; | |
231 | continue; /* XXX - had_error++ ? */ | |
232 | } | |
fa0bc87c | 233 | if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) { |
28f540f4 RM |
234 | if (ap >= &host_aliases[MAXALIASES-1]) |
235 | continue; | |
236 | n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); | |
55707265 | 237 | if ((n < 0) || !(*name_ok)(tbuf)) { |
28f540f4 RM |
238 | had_error++; |
239 | continue; | |
240 | } | |
241 | cp += n; | |
66715f83 UD |
242 | if (cp != erdata) { |
243 | __set_h_errno (NO_RECOVERY); | |
244 | return (NULL); | |
245 | } | |
28f540f4 RM |
246 | /* Store alias. */ |
247 | *ap++ = bp; | |
248 | n = strlen(bp) + 1; /* for the \0 */ | |
76b87c03 UD |
249 | if (n >= MAXHOSTNAMELEN) { |
250 | had_error++; | |
251 | continue; | |
252 | } | |
28f540f4 RM |
253 | bp += n; |
254 | buflen -= n; | |
255 | /* Get canonical name. */ | |
256 | n = strlen(tbuf) + 1; /* for the \0 */ | |
76b87c03 | 257 | if (n > buflen || n >= MAXHOSTNAMELEN) { |
28f540f4 RM |
258 | had_error++; |
259 | continue; | |
260 | } | |
261 | strcpy(bp, tbuf); | |
262 | host.h_name = bp; | |
263 | bp += n; | |
264 | buflen -= n; | |
265 | continue; | |
266 | } | |
3cf595e5 RM |
267 | if (qtype == T_PTR && type == T_CNAME) { |
268 | n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); | |
da2d1bc5 | 269 | if (n < 0 || !res_dnok(tbuf)) { |
3cf595e5 RM |
270 | had_error++; |
271 | continue; | |
272 | } | |
273 | cp += n; | |
66715f83 UD |
274 | if (cp != erdata) { |
275 | __set_h_errno (NO_RECOVERY); | |
276 | return (NULL); | |
277 | } | |
3cf595e5 RM |
278 | /* Get canonical name. */ |
279 | n = strlen(tbuf) + 1; /* for the \0 */ | |
76b87c03 | 280 | if (n > buflen || n >= MAXHOSTNAMELEN) { |
3cf595e5 RM |
281 | had_error++; |
282 | continue; | |
283 | } | |
284 | strcpy(bp, tbuf); | |
285 | tname = bp; | |
286 | bp += n; | |
287 | buflen -= n; | |
288 | continue; | |
289 | } | |
28f540f4 | 290 | if (type != qtype) { |
3e3002ff SP |
291 | /* Log a low priority message if we get an unexpected |
292 | * record, but skip it if we are using DNSSEC since it | |
293 | * uses many different types in responses that do not | |
294 | * match QTYPE. | |
295 | */ | |
28f540f4 RM |
296 | cp += n; |
297 | continue; /* XXX - had_error++ ? */ | |
298 | } | |
299 | switch (type) { | |
300 | case T_PTR: | |
3cf595e5 | 301 | if (strcasecmp(tname, bp) != 0) { |
28f540f4 RM |
302 | cp += n; |
303 | continue; /* XXX - had_error++ ? */ | |
304 | } | |
305 | n = dn_expand(answer->buf, eom, cp, bp, buflen); | |
55707265 | 306 | if ((n < 0) || !res_hnok(bp)) { |
28f540f4 RM |
307 | had_error++; |
308 | break; | |
309 | } | |
28f540f4 | 310 | cp += n; |
66715f83 UD |
311 | if (cp != erdata) { |
312 | __set_h_errno (NO_RECOVERY); | |
313 | return (NULL); | |
314 | } | |
28f540f4 RM |
315 | if (!haveanswer) |
316 | host.h_name = bp; | |
317 | else if (ap < &host_aliases[MAXALIASES-1]) | |
318 | *ap++ = bp; | |
319 | else | |
320 | n = -1; | |
321 | if (n != -1) { | |
322 | n = strlen(bp) + 1; /* for the \0 */ | |
76b87c03 UD |
323 | if (n >= MAXHOSTNAMELEN) { |
324 | had_error++; | |
325 | break; | |
326 | } | |
28f540f4 RM |
327 | bp += n; |
328 | buflen -= n; | |
329 | } | |
330 | break; | |
28f540f4 | 331 | case T_A: |
fa0bc87c | 332 | case T_AAAA: |
28f540f4 | 333 | if (strcasecmp(host.h_name, bp) != 0) { |
28f540f4 RM |
334 | cp += n; |
335 | continue; /* XXX - had_error++ ? */ | |
336 | } | |
1f64ac13 UD |
337 | if (n != host.h_length) { |
338 | cp += n; | |
339 | continue; | |
340 | } | |
341 | if (!haveanswer) { | |
2e09a79a | 342 | int nn; |
28f540f4 | 343 | |
28f540f4 RM |
344 | host.h_name = bp; |
345 | nn = strlen(bp) + 1; /* for the \0 */ | |
346 | bp += nn; | |
347 | buflen -= nn; | |
348 | } | |
349 | ||
31a13ab3 UD |
350 | /* XXX: when incrementing bp, we have to decrement |
351 | * buflen by the same amount --okir */ | |
352 | buflen -= sizeof(align) - ((u_long)bp % sizeof(align)); | |
353 | ||
28f540f4 RM |
354 | bp += sizeof(align) - ((u_long)bp % sizeof(align)); |
355 | ||
356 | if (bp + n >= &hostbuf[sizeof hostbuf]) { | |
28f540f4 RM |
357 | had_error++; |
358 | continue; | |
359 | } | |
360 | if (hap >= &h_addr_ptrs[MAXADDRS-1]) { | |
28f540f4 RM |
361 | cp += n; |
362 | continue; | |
363 | } | |
9596d0dd | 364 | memmove(*hap++ = bp, cp, n); |
28f540f4 | 365 | bp += n; |
df21c858 | 366 | buflen -= n; |
28f540f4 | 367 | cp += n; |
66715f83 UD |
368 | if (cp != erdata) { |
369 | __set_h_errno (NO_RECOVERY); | |
370 | return (NULL); | |
371 | } | |
28f540f4 RM |
372 | break; |
373 | default: | |
fa0bc87c RM |
374 | abort(); |
375 | } | |
28f540f4 RM |
376 | if (!had_error) |
377 | haveanswer++; | |
fa0bc87c | 378 | } |
28f540f4 RM |
379 | if (haveanswer) { |
380 | *ap = NULL; | |
381 | *hap = NULL; | |
28f540f4 RM |
382 | /* |
383 | * Note: we sort even if host can take only one address | |
384 | * in its return structures - should give it the "best" | |
385 | * address in that case, not some random one | |
386 | */ | |
fa0bc87c | 387 | if (_res.nsort && haveanswer > 1 && qtype == T_A) |
28f540f4 | 388 | addrsort(h_addr_ptrs, haveanswer); |
28f540f4 RM |
389 | if (!host.h_name) { |
390 | n = strlen(qname) + 1; /* for the \0 */ | |
76b87c03 UD |
391 | if (n > buflen || n >= MAXHOSTNAMELEN) |
392 | goto no_recovery; | |
28f540f4 RM |
393 | strcpy(bp, qname); |
394 | host.h_name = bp; | |
fa0bc87c RM |
395 | bp += n; |
396 | buflen -= n; | |
28f540f4 | 397 | } |
b76e0659 | 398 | if (res_use_inet6 ()) |
fa0bc87c | 399 | map_v4v6_hostent(&host, &bp, &buflen); |
a68b0d31 | 400 | __set_h_errno (NETDB_SUCCESS); |
28f540f4 | 401 | return (&host); |
28f540f4 | 402 | } |
76b87c03 UD |
403 | no_recovery: |
404 | __set_h_errno (NO_RECOVERY); | |
fa0bc87c | 405 | return (NULL); |
28f540f4 RM |
406 | } |
407 | ||
e7eceec0 FW |
408 | extern struct hostent *res_gethostbyname2(const char *name, int af); |
409 | libresolv_hidden_proto (res_gethostbyname2) | |
6f9d8e68 | 410 | |
28f540f4 | 411 | struct hostent * |
e7eceec0 | 412 | res_gethostbyname (const char *name) |
3cf595e5 | 413 | { |
352f4ff9 FW |
414 | struct resolv_context *ctx = __resolv_context_get (); |
415 | if (ctx == NULL) | |
416 | { | |
417 | __set_h_errno (NETDB_INTERNAL); | |
418 | return NULL; | |
419 | } | |
420 | ||
421 | if (res_use_inet6 ()) | |
422 | { | |
423 | struct hostent *hp = res_gethostbyname2_context (ctx, name, AF_INET6); | |
424 | if (hp != NULL) | |
425 | { | |
426 | __resolv_context_put (ctx); | |
427 | return hp; | |
3cf595e5 | 428 | } |
352f4ff9 FW |
429 | } |
430 | struct hostent *hp = res_gethostbyname2_context (ctx, name, AF_INET); | |
431 | __resolv_context_put (ctx); | |
432 | return hp; | |
3cf595e5 | 433 | } |
e7eceec0 | 434 | compat_symbol (libresolv, res_gethostbyname, res_gethostbyname, GLIBC_2_0); |
3cf595e5 | 435 | |
352f4ff9 FW |
436 | static struct hostent * |
437 | res_gethostbyname2_context (struct resolv_context *ctx, | |
438 | const char *name, int af) | |
28f540f4 | 439 | { |
16b66062 AJ |
440 | union |
441 | { | |
442 | querybuf *buf; | |
443 | u_char *ptr; | |
444 | } buf; | |
445 | querybuf *origbuf; | |
2e09a79a | 446 | const char *cp; |
fa0bc87c | 447 | char *bp; |
0420d888 | 448 | int n, size, type, len; |
6166815d | 449 | struct hostent *ret; |
28f540f4 | 450 | |
fa0bc87c RM |
451 | switch (af) { |
452 | case AF_INET: | |
453 | size = INADDRSZ; | |
454 | type = T_A; | |
455 | break; | |
456 | case AF_INET6: | |
457 | size = IN6ADDRSZ; | |
458 | type = T_AAAA; | |
459 | break; | |
460 | default: | |
a68b0d31 | 461 | __set_h_errno (NETDB_INTERNAL); |
ba1ffaa1 | 462 | __set_errno (EAFNOSUPPORT); |
fa0bc87c RM |
463 | return (NULL); |
464 | } | |
465 | ||
466 | host.h_addrtype = af; | |
467 | host.h_length = size; | |
468 | ||
28f540f4 RM |
469 | /* |
470 | * if there aren't any dots, it could be a user-level alias. | |
471 | * this is also done in res_query() since we are not the only | |
472 | * function that looks up host names. | |
473 | */ | |
352f4ff9 FW |
474 | char abuf[MAXDNAME]; |
475 | if (strchr (name, '.') != NULL | |
476 | && (cp = __res_context_hostalias (ctx, name, abuf, sizeof (abuf)))) | |
477 | name = cp; | |
28f540f4 RM |
478 | |
479 | /* | |
480 | * disallow names consisting only of digits/dots, unless | |
481 | * they end in a dot. | |
482 | */ | |
483 | if (isdigit(name[0])) | |
484 | for (cp = name;; ++cp) { | |
485 | if (!*cp) { | |
486 | if (*--cp == '.') | |
487 | break; | |
488 | /* | |
489 | * All-numeric, no dot at the end. | |
490 | * Fake up a hostent as if we'd actually | |
491 | * done a lookup. | |
492 | */ | |
613a76ff | 493 | if (inet_pton(af, name, host_addr) <= 0) { |
a68b0d31 | 494 | __set_h_errno (HOST_NOT_FOUND); |
28f540f4 RM |
495 | return (NULL); |
496 | } | |
3d61b63c RM |
497 | strncpy(hostbuf, name, MAXDNAME); |
498 | hostbuf[MAXDNAME] = '\0'; | |
fa0bc87c RM |
499 | bp = hostbuf + MAXDNAME; |
500 | len = sizeof hostbuf - MAXDNAME; | |
3d61b63c | 501 | host.h_name = hostbuf; |
28f540f4 RM |
502 | host.h_aliases = host_aliases; |
503 | host_aliases[0] = NULL; | |
613a76ff | 504 | h_addr_ptrs[0] = (char *)host_addr; |
28f540f4 | 505 | h_addr_ptrs[1] = NULL; |
28f540f4 | 506 | host.h_addr_list = h_addr_ptrs; |
b76e0659 | 507 | if (res_use_inet6 ()) |
fa0bc87c | 508 | map_v4v6_hostent(&host, &bp, &len); |
a68b0d31 | 509 | __set_h_errno (NETDB_SUCCESS); |
28f540f4 RM |
510 | return (&host); |
511 | } | |
fa0bc87c | 512 | if (!isdigit(*cp) && *cp != '.') |
28f540f4 | 513 | break; |
312be3f9 | 514 | } |
76b87c03 UD |
515 | if ((isxdigit(name[0]) && strchr(name, ':') != NULL) || |
516 | name[0] == ':') | |
845dcb57 UD |
517 | for (cp = name;; ++cp) { |
518 | if (!*cp) { | |
519 | if (*--cp == '.') | |
520 | break; | |
521 | /* | |
522 | * All-IPv6-legal, no dot at the end. | |
523 | * Fake up a hostent as if we'd actually | |
524 | * done a lookup. | |
525 | */ | |
526 | if (inet_pton(af, name, host_addr) <= 0) { | |
a68b0d31 | 527 | __set_h_errno (HOST_NOT_FOUND); |
845dcb57 UD |
528 | return (NULL); |
529 | } | |
530 | strncpy(hostbuf, name, MAXDNAME); | |
531 | hostbuf[MAXDNAME] = '\0'; | |
532 | bp = hostbuf + MAXDNAME; | |
533 | len = sizeof hostbuf - MAXDNAME; | |
534 | host.h_name = hostbuf; | |
535 | host.h_aliases = host_aliases; | |
536 | host_aliases[0] = NULL; | |
537 | h_addr_ptrs[0] = (char *)host_addr; | |
538 | h_addr_ptrs[1] = NULL; | |
539 | host.h_addr_list = h_addr_ptrs; | |
a68b0d31 | 540 | __set_h_errno (NETDB_SUCCESS); |
845dcb57 UD |
541 | return (&host); |
542 | } | |
543 | if (!isxdigit(*cp) && *cp != ':' && *cp != '.') | |
544 | break; | |
28f540f4 RM |
545 | } |
546 | ||
16b66062 | 547 | buf.buf = origbuf = (querybuf *) alloca (1024); |
6166815d | 548 | |
352f4ff9 FW |
549 | if ((n = __res_context_search |
550 | (ctx, name, C_IN, type, buf.buf->buf, 1024, | |
551 | &buf.ptr, NULL, NULL, NULL, NULL)) < 0) { | |
16b66062 AJ |
552 | if (buf.buf != origbuf) |
553 | free (buf.buf); | |
5f0e6fc7 RM |
554 | if (errno == ECONNREFUSED) |
555 | return (_gethtbyname2(name, af)); | |
556 | return (NULL); | |
28f540f4 | 557 | } |
16b66062 AJ |
558 | ret = getanswer(buf.buf, n, name, type); |
559 | if (buf.buf != origbuf) | |
560 | free (buf.buf); | |
6166815d | 561 | return ret; |
28f540f4 | 562 | } |
352f4ff9 FW |
563 | |
564 | struct hostent * | |
565 | res_gethostbyname2 (const char *name, int af) | |
566 | { | |
567 | struct resolv_context *ctx = __resolv_context_get (); | |
568 | if (ctx == NULL) | |
569 | { | |
570 | __set_h_errno (NETDB_INTERNAL); | |
571 | return NULL; | |
572 | } | |
573 | struct hostent *hp = res_gethostbyname2_context (ctx, name, AF_INET); | |
574 | __resolv_context_put (ctx); | |
575 | return hp; | |
576 | } | |
e7eceec0 FW |
577 | libresolv_hidden_def (res_gethostbyname2) |
578 | compat_symbol (libresolv, res_gethostbyname2, res_gethostbyname2, GLIBC_2_0); | |
28f540f4 | 579 | |
352f4ff9 FW |
580 | static struct hostent * |
581 | res_gethostbyaddr_context (struct resolv_context *ctx, | |
582 | const void *addr, socklen_t len, int af) | |
28f540f4 | 583 | { |
fa0bc87c RM |
584 | const u_char *uaddr = (const u_char *)addr; |
585 | static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff }; | |
586 | static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 }; | |
0420d888 | 587 | int n; |
160bb409 | 588 | socklen_t size; |
16b66062 AJ |
589 | union |
590 | { | |
591 | querybuf *buf; | |
592 | u_char *ptr; | |
593 | } buf; | |
594 | querybuf *orig_buf; | |
2e09a79a | 595 | struct hostent *hp; |
3db04c6f | 596 | char qbuf[MAXDNAME+1], *qp = NULL; |
fa0bc87c | 597 | |
fa0bc87c | 598 | if (af == AF_INET6 && len == IN6ADDRSZ && |
1c6e6f23 RM |
599 | (!memcmp(uaddr, mapped, sizeof mapped) || |
600 | !memcmp(uaddr, tunnelled, sizeof tunnelled))) { | |
fa0bc87c RM |
601 | /* Unmap. */ |
602 | addr += sizeof mapped; | |
603 | uaddr += sizeof mapped; | |
604 | af = AF_INET; | |
605 | len = INADDRSZ; | |
606 | } | |
607 | switch (af) { | |
608 | case AF_INET: | |
609 | size = INADDRSZ; | |
610 | break; | |
611 | case AF_INET6: | |
612 | size = IN6ADDRSZ; | |
613 | break; | |
614 | default: | |
a68b0d31 UD |
615 | __set_errno (EAFNOSUPPORT); |
616 | __set_h_errno (NETDB_INTERNAL); | |
28f540f4 RM |
617 | return (NULL); |
618 | } | |
fa0bc87c | 619 | if (size != len) { |
a68b0d31 UD |
620 | __set_errno (EINVAL); |
621 | __set_h_errno (NETDB_INTERNAL); | |
28f540f4 RM |
622 | return (NULL); |
623 | } | |
5f0e6fc7 RM |
624 | switch (af) { |
625 | case AF_INET: | |
626 | (void) sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", | |
627 | (uaddr[3] & 0xff), | |
628 | (uaddr[2] & 0xff), | |
629 | (uaddr[1] & 0xff), | |
630 | (uaddr[0] & 0xff)); | |
631 | break; | |
632 | case AF_INET6: | |
633 | qp = qbuf; | |
634 | for (n = IN6ADDRSZ - 1; n >= 0; n--) { | |
e01eef67 FW |
635 | qp += sprintf(qp, "%x.%x.", |
636 | uaddr[n] & 0xf, | |
637 | (uaddr[n] >> 4) & 0xf); | |
fa0bc87c | 638 | } |
ca6c7389 | 639 | strcpy(qp, "ip6.arpa"); |
5f0e6fc7 RM |
640 | break; |
641 | default: | |
642 | abort(); | |
643 | } | |
6166815d | 644 | |
16b66062 | 645 | buf.buf = orig_buf = (querybuf *) alloca (1024); |
6166815d | 646 | |
352f4ff9 FW |
647 | n = __res_context_query (ctx, qbuf, C_IN, T_PTR, buf.buf->buf, 1024, |
648 | &buf.ptr, NULL, NULL, NULL, NULL); | |
5f0e6fc7 | 649 | if (n < 0) { |
16b66062 AJ |
650 | if (buf.buf != orig_buf) |
651 | free (buf.buf); | |
5f0e6fc7 RM |
652 | if (errno == ECONNREFUSED) |
653 | return (_gethtbyaddr(addr, len, af)); | |
654 | return (NULL); | |
28f540f4 | 655 | } |
16b66062 AJ |
656 | hp = getanswer(buf.buf, n, qbuf, T_PTR); |
657 | if (buf.buf != orig_buf) | |
658 | free (buf.buf); | |
6166815d | 659 | if (!hp) |
5f0e6fc7 | 660 | return (NULL); /* h_errno was set by getanswer() */ |
5f0e6fc7 RM |
661 | hp->h_addrtype = af; |
662 | hp->h_length = len; | |
9596d0dd | 663 | memmove(host_addr, addr, len); |
5f0e6fc7 RM |
664 | h_addr_ptrs[0] = (char *)host_addr; |
665 | h_addr_ptrs[1] = NULL; | |
b76e0659 | 666 | if (af == AF_INET && res_use_inet6 ()) { |
5f0e6fc7 RM |
667 | map_v4v6_address((char*)host_addr, (char*)host_addr); |
668 | hp->h_addrtype = AF_INET6; | |
669 | hp->h_length = IN6ADDRSZ; | |
670 | } | |
a68b0d31 | 671 | __set_h_errno (NETDB_SUCCESS); |
5f0e6fc7 | 672 | return (hp); |
28f540f4 | 673 | } |
352f4ff9 FW |
674 | |
675 | struct hostent * | |
676 | res_gethostbyaddr (const void *addr, socklen_t len, int af) | |
677 | { | |
678 | struct resolv_context *ctx = __resolv_context_get (); | |
679 | if (ctx == NULL) | |
680 | { | |
681 | __set_h_errno (NETDB_INTERNAL); | |
682 | return NULL; | |
683 | } | |
684 | struct hostent *hp = res_gethostbyaddr_context (ctx, addr, len, af); | |
685 | __resolv_context_put (ctx); | |
686 | return hp; | |
687 | } | |
e7eceec0 | 688 | compat_symbol (libresolv, res_gethostbyaddr, res_gethostbyaddr, GLIBC_2_0); |
28f540f4 RM |
689 | |
690 | void | |
9d46370c | 691 | _sethtent (int f) |
28f540f4 RM |
692 | { |
693 | if (!hostf) | |
312be3f9 | 694 | hostf = fopen(_PATH_HOSTS, "rce" ); |
28f540f4 RM |
695 | else |
696 | rewind(hostf); | |
697 | stayopen = f; | |
698 | } | |
6f9d8e68 | 699 | libresolv_hidden_def (_sethtent) |
e7eceec0 | 700 | compat_symbol (libresolv, _sethtent, _sethtent, GLIBC_2_0); |
28f540f4 | 701 | |
e7eceec0 | 702 | static void |
60d2f8f3 | 703 | _endhtent (void) |
28f540f4 RM |
704 | { |
705 | if (hostf && !stayopen) { | |
706 | (void) fclose(hostf); | |
707 | hostf = NULL; | |
708 | } | |
709 | } | |
710 | ||
711 | struct hostent * | |
60d2f8f3 | 712 | _gethtent (void) |
28f540f4 RM |
713 | { |
714 | char *p; | |
2e09a79a | 715 | char *cp, **q; |
fa0bc87c | 716 | int af, len; |
28f540f4 | 717 | |
312be3f9 | 718 | if (!hostf && !(hostf = fopen(_PATH_HOSTS, "rce" ))) { |
a68b0d31 | 719 | __set_h_errno (NETDB_INTERNAL); |
28f540f4 RM |
720 | return (NULL); |
721 | } | |
fa0bc87c | 722 | again: |
28f540f4 | 723 | if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) { |
a68b0d31 | 724 | __set_h_errno (HOST_NOT_FOUND); |
28f540f4 RM |
725 | return (NULL); |
726 | } | |
727 | if (*p == '#') | |
728 | goto again; | |
729 | if (!(cp = strpbrk(p, "#\n"))) | |
730 | goto again; | |
731 | *cp = '\0'; | |
732 | if (!(cp = strpbrk(p, " \t"))) | |
733 | goto again; | |
734 | *cp++ = '\0'; | |
76b87c03 | 735 | if (inet_pton(AF_INET6, p, host_addr) > 0) { |
fa0bc87c RM |
736 | af = AF_INET6; |
737 | len = IN6ADDRSZ; | |
613a76ff | 738 | } else if (inet_pton(AF_INET, p, host_addr) > 0) { |
b76e0659 | 739 | if (res_use_inet6 ()) { |
613a76ff | 740 | map_v4v6_address((char*)host_addr, (char*)host_addr); |
fa0bc87c RM |
741 | af = AF_INET6; |
742 | len = IN6ADDRSZ; | |
743 | } else { | |
744 | af = AF_INET; | |
745 | len = INADDRSZ; | |
746 | } | |
747 | } else { | |
28f540f4 | 748 | goto again; |
fa0bc87c | 749 | } |
613a76ff | 750 | h_addr_ptrs[0] = (char *)host_addr; |
28f540f4 | 751 | h_addr_ptrs[1] = NULL; |
28f540f4 | 752 | host.h_addr_list = h_addr_ptrs; |
fa0bc87c RM |
753 | host.h_length = len; |
754 | host.h_addrtype = af; | |
28f540f4 RM |
755 | while (*cp == ' ' || *cp == '\t') |
756 | cp++; | |
757 | host.h_name = cp; | |
758 | q = host.h_aliases = host_aliases; | |
6796bc80 | 759 | if ((cp = strpbrk(cp, " \t"))) |
28f540f4 RM |
760 | *cp++ = '\0'; |
761 | while (cp && *cp) { | |
762 | if (*cp == ' ' || *cp == '\t') { | |
763 | cp++; | |
764 | continue; | |
765 | } | |
766 | if (q < &host_aliases[MAXALIASES - 1]) | |
767 | *q++ = cp; | |
6796bc80 | 768 | if ((cp = strpbrk(cp, " \t"))) |
28f540f4 RM |
769 | *cp++ = '\0'; |
770 | } | |
771 | *q = NULL; | |
a68b0d31 | 772 | __set_h_errno (NETDB_SUCCESS); |
28f540f4 RM |
773 | return (&host); |
774 | } | |
6f9d8e68 | 775 | libresolv_hidden_def (_gethtent) |
e7eceec0 | 776 | compat_symbol (libresolv, _gethtent, _gethtent, GLIBC_2_0); |
28f540f4 RM |
777 | |
778 | struct hostent * | |
9d46370c | 779 | _gethtbyname (const char *name) |
fa0bc87c | 780 | { |
fa0bc87c RM |
781 | struct hostent *hp; |
782 | ||
b76e0659 | 783 | if (res_use_inet6 ()) { |
fa0bc87c RM |
784 | hp = _gethtbyname2(name, AF_INET6); |
785 | if (hp) | |
786 | return (hp); | |
787 | } | |
788 | return (_gethtbyname2(name, AF_INET)); | |
789 | } | |
e7eceec0 | 790 | compat_symbol (libresolv, _gethtbyname, _gethtbyname, GLIBC_2_0); |
fa0bc87c RM |
791 | |
792 | struct hostent * | |
9d46370c | 793 | _gethtbyname2 (const char *name, int af) |
28f540f4 | 794 | { |
2e09a79a JM |
795 | struct hostent *p; |
796 | char **cp; | |
fa0bc87c | 797 | |
28f540f4 | 798 | _sethtent(0); |
6796bc80 | 799 | while ((p = _gethtent())) { |
5f0e6fc7 RM |
800 | if (p->h_addrtype != af) |
801 | continue; | |
802 | if (strcasecmp(p->h_name, name) == 0) | |
803 | break; | |
804 | for (cp = p->h_aliases; *cp != 0; cp++) | |
805 | if (strcasecmp(*cp, name) == 0) | |
806 | goto found; | |
28f540f4 | 807 | } |
fa0bc87c | 808 | found: |
28f540f4 RM |
809 | _endhtent(); |
810 | return (p); | |
811 | } | |
6f9d8e68 | 812 | libresolv_hidden_def (_gethtbyname2) |
e7eceec0 | 813 | compat_symbol (libresolv, _gethtbyname2, _gethtbyname2, GLIBC_2_0); |
28f540f4 RM |
814 | |
815 | struct hostent * | |
9d46370c | 816 | _gethtbyaddr (const char *addr, size_t len, int af) |
28f540f4 | 817 | { |
2e09a79a | 818 | struct hostent *p; |
28f540f4 RM |
819 | |
820 | _sethtent(0); | |
6796bc80 | 821 | while ((p = _gethtent())) |
1c6e6f23 | 822 | if (p->h_addrtype == af && !memcmp(p->h_addr, addr, len)) |
28f540f4 RM |
823 | break; |
824 | _endhtent(); | |
825 | return (p); | |
826 | } | |
6f9d8e68 | 827 | libresolv_hidden_def (_gethtbyaddr) |
e7eceec0 | 828 | compat_symbol (libresolv, _gethtbyaddr, _gethtbyaddr, GLIBC_2_0); |
28f540f4 | 829 | |
fa0bc87c | 830 | static void |
9d46370c | 831 | map_v4v6_address (const char *src, char *dst) |
fa0bc87c RM |
832 | { |
833 | u_char *p = (u_char *)dst; | |
834 | char tmp[INADDRSZ]; | |
835 | int i; | |
836 | ||
837 | /* Stash a temporary copy so our caller can update in place. */ | |
9596d0dd | 838 | memcpy(tmp, src, INADDRSZ); |
fa0bc87c RM |
839 | /* Mark this ipv6 addr as a mapped ipv4. */ |
840 | for (i = 0; i < 10; i++) | |
841 | *p++ = 0x00; | |
842 | *p++ = 0xff; | |
843 | *p++ = 0xff; | |
844 | /* Retrieve the saved copy and we're done. */ | |
9596d0dd | 845 | memcpy((void*)p, tmp, INADDRSZ); |
fa0bc87c RM |
846 | } |
847 | ||
848 | static void | |
9d46370c | 849 | map_v4v6_hostent (struct hostent *hp, char **bpp, int *lenp) |
fa0bc87c RM |
850 | { |
851 | char **ap; | |
852 | ||
853 | if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ) | |
854 | return; | |
855 | hp->h_addrtype = AF_INET6; | |
856 | hp->h_length = IN6ADDRSZ; | |
857 | for (ap = hp->h_addr_list; *ap; ap++) { | |
858 | int i = sizeof(align) - ((u_long)*bpp % sizeof(align)); | |
859 | ||
860 | if (*lenp < (i + IN6ADDRSZ)) { | |
861 | /* Out of memory. Truncate address list here. XXX */ | |
862 | *ap = NULL; | |
863 | return; | |
864 | } | |
865 | *bpp += i; | |
866 | *lenp -= i; | |
867 | map_v4v6_address(*ap, *bpp); | |
868 | *ap = *bpp; | |
869 | *bpp += IN6ADDRSZ; | |
870 | *lenp -= IN6ADDRSZ; | |
871 | } | |
872 | } | |
873 | ||
03e4219e | 874 | extern void |
9d46370c | 875 | addrsort (char **ap, int num) |
28f540f4 RM |
876 | { |
877 | int i, j; | |
878 | char **p; | |
879 | short aval[MAXADDRS]; | |
880 | int needsort = 0; | |
881 | ||
882 | p = ap; | |
883 | for (i = 0; i < num; i++, p++) { | |
884 | for (j = 0 ; (unsigned)j < _res.nsort; j++) | |
fa0bc87c | 885 | if (_res.sort_list[j].addr.s_addr == |
28f540f4 RM |
886 | (((struct in_addr *)(*p))->s_addr & _res.sort_list[j].mask)) |
887 | break; | |
888 | aval[i] = j; | |
889 | if (needsort == 0 && i > 0 && j < aval[i-1]) | |
890 | needsort = i; | |
891 | } | |
892 | if (!needsort) | |
893 | return; | |
894 | ||
895 | while (needsort < num) { | |
896 | for (j = needsort - 1; j >= 0; j--) { | |
897 | if (aval[j] > aval[j+1]) { | |
898 | char *hp; | |
899 | ||
900 | i = aval[j]; | |
901 | aval[j] = aval[j+1]; | |
902 | aval[j+1] = i; | |
903 | ||
904 | hp = ap[j]; | |
905 | ap[j] = ap[j+1]; | |
906 | ap[j+1] = hp; | |
907 | ||
908 | } else | |
909 | break; | |
910 | } | |
911 | needsort++; | |
912 | } | |
913 | } | |
e7eceec0 FW |
914 | |
915 | #endif /* SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_25) */ |