]>
Commit | Line | Data |
---|---|---|
da2d1bc5 | 1 | /* Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc. |
84384f5b UD |
2 | This file is part of the GNU C Library. |
3 | Extended from original form by Ulrich Drepper <drepper@cygnus.com>, 1996. | |
5f0e6fc7 | 4 | |
84384f5b UD |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
5f0e6fc7 | 9 | |
84384f5b UD |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
5f0e6fc7 | 14 | |
84384f5b UD |
15 | You should have received a copy of the GNU Library General Public |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
5f0e6fc7 | 19 | |
df21c858 | 20 | /* Parts of this file are plain copies of the file `gethtnamadr.c' from |
5f0e6fc7 RM |
21 | the bind package and it has the following copyright. */ |
22 | ||
5f0e6fc7 | 23 | /* |
df21c858 UD |
24 | * ++Copyright++ 1985, 1988, 1993 |
25 | * - | |
26 | * Copyright (c) 1985, 1988, 1993 | |
27 | * The Regents of the University of California. All rights reserved. | |
5f0e6fc7 RM |
28 | * |
29 | * Redistribution and use in source and binary forms, with or without | |
30 | * modification, are permitted provided that the following conditions | |
31 | * are met: | |
32 | * 1. Redistributions of source code must retain the above copyright | |
33 | * notice, this list of conditions and the following disclaimer. | |
34 | * 2. Redistributions in binary form must reproduce the above copyright | |
35 | * notice, this list of conditions and the following disclaimer in the | |
36 | * documentation and/or other materials provided with the distribution. | |
37 | * 3. All advertising materials mentioning features or use of this software | |
38 | * must display the following acknowledgement: | |
df21c858 UD |
39 | * This product includes software developed by the University of |
40 | * California, Berkeley and its contributors. | |
5f0e6fc7 RM |
41 | * 4. Neither the name of the University nor the names of its contributors |
42 | * may be used to endorse or promote products derived from this software | |
43 | * without specific prior written permission. | |
44 | * | |
45 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
46 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
47 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
48 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
49 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
50 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
51 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
52 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
53 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
54 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
55 | * SUCH DAMAGE. | |
df21c858 UD |
56 | * - |
57 | * Portions Copyright (c) 1993 by Digital Equipment Corporation. | |
58 | * | |
59 | * Permission to use, copy, modify, and distribute this software for any | |
60 | * purpose with or without fee is hereby granted, provided that the above | |
61 | * copyright notice and this permission notice appear in all copies, and that | |
62 | * the name of Digital Equipment Corporation not be used in advertising or | |
63 | * publicity pertaining to distribution of the document or software without | |
64 | * specific, written prior permission. | |
65 | * | |
66 | * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL | |
67 | * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES | |
68 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT | |
69 | * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL | |
70 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR | |
71 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS | |
72 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
73 | * SOFTWARE. | |
74 | * - | |
75 | * --Copyright-- | |
5f0e6fc7 RM |
76 | */ |
77 | ||
78 | #include <ctype.h> | |
79 | #include <errno.h> | |
80 | #include <netdb.h> | |
81 | #include <stdio.h> | |
82 | #include <stdlib.h> | |
83 | #include <stddef.h> | |
84 | #include <string.h> | |
85 | #include <sys/syslog.h> | |
86 | ||
5f0e6fc7 RM |
87 | #include "nsswitch.h" |
88 | ||
89 | /* Get implementation for some internal functions. */ | |
da2d1bc5 UD |
90 | #include <resolv/mapv4v6addr.h> |
91 | #include <resolv/mapv4v6hostent.h> | |
5f0e6fc7 RM |
92 | |
93 | /* Maximum number of aliases we allow. */ | |
94 | #define MAX_NR_ALIASES 48 | |
95 | #define MAX_NR_ADDRS 48 | |
96 | ||
97 | #if PACKETSZ > 1024 | |
98 | # define MAXPACKET PACKETSZ | |
99 | #else | |
100 | # define MAXPACKET 1024 | |
101 | #endif | |
1522c368 UD |
102 | /* As per RFC 1034 and 1035 a host name cannot exceed 255 octets in length. */ |
103 | #ifdef MAXHOSTNAMELEN | |
104 | # undef MAXHOSTNAMELEN | |
105 | #endif | |
106 | #define MAXHOSTNAMELEN 256 | |
5f0e6fc7 RM |
107 | |
108 | static const char AskedForGot[] = "\ | |
109 | gethostby*.getanswer: asked for \"%s\", got \"%s\""; | |
110 | ||
111 | ||
112 | /* We need this time later. */ | |
113 | typedef union querybuf | |
114 | { | |
115 | HEADER hdr; | |
116 | u_char buf[MAXPACKET]; | |
117 | } querybuf; | |
118 | ||
119 | ||
120 | static enum nss_status getanswer_r (const querybuf *answer, int anslen, | |
121 | const char *qname, int qtype, | |
df4ef2ab UD |
122 | struct hostent *result, char *buffer, |
123 | size_t buflen, int *h_errnop); | |
5f0e6fc7 RM |
124 | |
125 | enum nss_status | |
126 | _nss_dns_gethostbyname2_r (const char *name, int af, struct hostent *result, | |
df4ef2ab | 127 | char *buffer, size_t buflen, int *h_errnop) |
5f0e6fc7 | 128 | { |
5f0e6fc7 RM |
129 | querybuf host_buffer; |
130 | int size, type, n; | |
131 | const char *cp; | |
132 | ||
133 | switch (af) { | |
134 | case AF_INET: | |
135 | size = INADDRSZ; | |
136 | type = T_A; | |
137 | break; | |
138 | case AF_INET6: | |
139 | size = IN6ADDRSZ; | |
140 | type = T_AAAA; | |
141 | break; | |
142 | default: | |
143 | *h_errnop = NETDB_INTERNAL; | |
c4029823 | 144 | __set_errno (EAFNOSUPPORT); |
5f0e6fc7 RM |
145 | return NSS_STATUS_UNAVAIL; |
146 | } | |
147 | ||
148 | result->h_addrtype = af; | |
149 | result->h_length = size; | |
150 | ||
151 | /* | |
152 | * if there aren't any dots, it could be a user-level alias. | |
153 | * this is also done in res_query() since we are not the only | |
154 | * function that looks up host names. | |
155 | */ | |
156 | if (strchr (name, '.') == NULL && (cp = __hostalias (name)) != NULL) | |
157 | name = cp; | |
158 | ||
795fbc9a | 159 | n = res_search (name, C_IN, type, host_buffer.buf, sizeof (host_buffer.buf)); |
5f0e6fc7 | 160 | if (n < 0) |
dd7d45e8 UD |
161 | { |
162 | *h_errnop = h_errno; | |
163 | return errno == ECONNREFUSED ? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND; | |
164 | } | |
5f0e6fc7 RM |
165 | |
166 | return getanswer_r (&host_buffer, n, name, type, result, buffer, buflen, | |
167 | h_errnop); | |
168 | } | |
169 | ||
170 | ||
171 | enum nss_status | |
172 | _nss_dns_gethostbyname_r (const char *name, struct hostent *result, | |
df4ef2ab | 173 | char *buffer, size_t buflen, int *h_errnop) |
5f0e6fc7 RM |
174 | { |
175 | enum nss_status status = NSS_STATUS_NOTFOUND; | |
176 | ||
177 | if (_res.options & RES_USE_INET6) | |
178 | status = _nss_dns_gethostbyname2_r (name, AF_INET6, result, buffer, | |
179 | buflen, h_errnop); | |
180 | if (status == NSS_STATUS_NOTFOUND) | |
181 | status = _nss_dns_gethostbyname2_r (name, AF_INET, result, buffer, | |
182 | buflen, h_errnop); | |
183 | ||
184 | return status; | |
185 | } | |
186 | ||
187 | ||
188 | enum nss_status | |
189 | _nss_dns_gethostbyaddr_r (const char *addr, int len, int af, | |
df4ef2ab | 190 | struct hostent *result, char *buffer, size_t buflen, |
5f0e6fc7 RM |
191 | int *h_errnop) |
192 | { | |
193 | static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff }; | |
194 | static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 }; | |
195 | const u_char *uaddr = (const u_char *)addr; | |
196 | struct host_data | |
197 | { | |
198 | char *aliases[MAX_NR_ALIASES]; | |
199 | unsigned char host_addr[16]; /* IPv4 or IPv6 */ | |
200 | char *h_addr_ptrs[MAX_NR_ADDRS + 1]; | |
201 | char linebuffer[0]; | |
202 | } *host_data = (struct host_data *) buffer; | |
203 | querybuf host_buffer; | |
204 | char qbuf[MAXDNAME+1], *qp; | |
205 | int size, n, status; | |
206 | ||
207 | if (af == AF_INET6 && len == IN6ADDRSZ && | |
63551311 UD |
208 | (memcmp (uaddr, mapped, sizeof mapped) == 0 |
209 | || memcmp (uaddr, tunnelled, sizeof tunnelled) == 0)) | |
5f0e6fc7 RM |
210 | { |
211 | /* Unmap. */ | |
212 | addr += sizeof mapped; | |
213 | uaddr += sizeof mapped; | |
214 | af = AF_INET; | |
215 | len = INADDRSZ; | |
216 | } | |
217 | ||
218 | switch (af) | |
219 | { | |
220 | case AF_INET: | |
221 | size = INADDRSZ; | |
222 | break; | |
223 | case AF_INET6: | |
224 | size = IN6ADDRSZ; | |
225 | break; | |
226 | default: | |
c4029823 | 227 | __set_errno (EAFNOSUPPORT); |
5f0e6fc7 RM |
228 | *h_errnop = NETDB_INTERNAL; |
229 | return NSS_STATUS_UNAVAIL; | |
230 | } | |
231 | if (size != len) | |
232 | { | |
c4029823 | 233 | __set_errno (EAFNOSUPPORT); |
5f0e6fc7 RM |
234 | *h_errnop = NETDB_INTERNAL; |
235 | return NSS_STATUS_UNAVAIL; | |
236 | } | |
237 | ||
238 | switch (af) | |
239 | { | |
240 | case AF_INET: | |
241 | sprintf (qbuf, "%u.%u.%u.%u.in-addr.arpa", (uaddr[3] & 0xff), | |
242 | (uaddr[2] & 0xff), (uaddr[1] & 0xff), (uaddr[0] & 0xff)); | |
243 | break; | |
244 | case AF_INET6: | |
245 | qp = qbuf; | |
246 | for (n = IN6ADDRSZ - 1; n >= 0; n--) | |
247 | qp += sprintf (qp, "%x.%x.", uaddr[n] & 0xf, (uaddr[n] >> 4) & 0xf); | |
da2d1bc5 | 248 | strcpy (qp, "ip6.int"); |
5f0e6fc7 RM |
249 | break; |
250 | default: | |
251 | /* Cannot happen. */ | |
252 | } | |
253 | ||
254 | n = res_query (qbuf, C_IN, T_PTR, (u_char *)host_buffer.buf, | |
255 | sizeof host_buffer); | |
256 | if (n < 0) | |
dd7d45e8 UD |
257 | { |
258 | *h_errnop = h_errno; | |
259 | return errno == ECONNREFUSED ? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND; | |
260 | } | |
5f0e6fc7 RM |
261 | |
262 | status = getanswer_r (&host_buffer, n, qbuf, T_PTR, result, buffer, buflen, | |
263 | h_errnop); | |
264 | if (status != NSS_STATUS_SUCCESS) | |
dd7d45e8 UD |
265 | { |
266 | *h_errnop = h_errno; | |
267 | return status; | |
268 | } | |
5f0e6fc7 RM |
269 | |
270 | #ifdef SUNSECURITY | |
271 | This is not implemented because it is not possible to use the current | |
272 | source from bind in a multi-threaded program. | |
273 | #endif | |
274 | ||
275 | result->h_addrtype = af; | |
276 | result->h_length = len; | |
63551311 | 277 | memcpy (host_data->host_addr, addr, len); |
5f0e6fc7 RM |
278 | host_data->h_addr_ptrs[0] = (char *) host_data->host_addr; |
279 | host_data->h_addr_ptrs[1] = NULL; | |
280 | if (af == AF_INET && (_res.options & RES_USE_INET6)) | |
281 | { | |
282 | map_v4v6_address ((char *) host_data->host_addr, | |
283 | (char *) host_data->host_addr); | |
284 | result->h_addrtype = AF_INET6; | |
285 | result->h_length = IN6ADDRSZ; | |
286 | } | |
287 | *h_errnop = NETDB_SUCCESS; | |
288 | return NSS_STATUS_SUCCESS; | |
289 | } | |
290 | ||
291 | ||
292 | static enum nss_status | |
293 | getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, | |
df4ef2ab UD |
294 | struct hostent *result, char *buffer, size_t buflen, |
295 | int *h_errnop) | |
5f0e6fc7 RM |
296 | { |
297 | struct host_data | |
298 | { | |
299 | char *aliases[MAX_NR_ALIASES]; | |
300 | unsigned char host_addr[16]; /* IPv4 or IPv6 */ | |
301 | char *h_addr_ptrs[MAX_NR_ADDRS + 1]; | |
302 | char linebuffer[0]; | |
303 | } *host_data = (struct host_data *) buffer; | |
304 | int linebuflen = buflen - offsetof (struct host_data, linebuffer); | |
305 | register const HEADER *hp; | |
306 | const u_char *end_of_message, *cp; | |
307 | int n, ancount, qdcount; | |
308 | int haveanswer, had_error; | |
309 | char *bp, **ap, **hap; | |
845dcb57 | 310 | char tbuf[MAXDNAME]; |
5f0e6fc7 RM |
311 | const char *tname; |
312 | int (*name_ok) __P ((const char *)); | |
313 | ||
314 | tname = qname; | |
315 | result->h_name = NULL; | |
316 | end_of_message = answer->buf + anslen; | |
317 | switch (qtype) | |
318 | { | |
319 | case T_A: | |
320 | case T_AAAA: | |
321 | name_ok = res_hnok; | |
322 | break; | |
323 | case T_PTR: | |
324 | name_ok = res_dnok; | |
325 | break; | |
326 | default: | |
327 | return NSS_STATUS_UNAVAIL; /* XXX should be abort(); */ | |
328 | } | |
329 | ||
330 | /* | |
331 | * find first satisfactory answer | |
332 | */ | |
333 | hp = &answer->hdr; | |
334 | bp = host_data->linebuffer; | |
335 | ancount = ntohs (hp->ancount); | |
336 | qdcount = ntohs (hp->qdcount); | |
337 | cp = answer->buf + HFIXEDSZ; | |
338 | if (qdcount != 1) | |
339 | { | |
340 | *h_errnop = NO_RECOVERY; | |
341 | return NSS_STATUS_UNAVAIL; | |
342 | } | |
343 | ||
344 | n = dn_expand (answer->buf, end_of_message, cp, bp, linebuflen); | |
345 | if (n < 0 || (*name_ok) (bp) == 0) | |
346 | { | |
347 | *h_errnop = NO_RECOVERY; | |
348 | return NSS_STATUS_UNAVAIL; | |
349 | } | |
350 | cp += n + QFIXEDSZ; | |
351 | ||
352 | if (qtype == T_A || qtype == T_AAAA) | |
353 | { | |
354 | /* res_send() has already verified that the query name is the | |
355 | * same as the one we sent; this just gets the expanded name | |
356 | * (i.e., with the succeeding search-domain tacked on). | |
357 | */ | |
358 | n = strlen (bp) + 1; /* for the \0 */ | |
76b87c03 UD |
359 | if (n >= MAXHOSTNAMELEN) |
360 | { | |
361 | __set_h_errno (NO_RECOVERY); | |
362 | return NSS_STATUS_TRYAGAIN; | |
363 | } | |
5f0e6fc7 RM |
364 | result->h_name = bp; |
365 | bp += n; | |
366 | linebuflen -= n; | |
367 | /* The qname can be abbreviated, but h_name is now absolute. */ | |
368 | qname = result->h_name; | |
369 | } | |
370 | ||
371 | ap = host_data->aliases; | |
372 | *ap = NULL; | |
373 | result->h_aliases = host_data->aliases; | |
374 | hap = host_data->h_addr_ptrs; | |
375 | *hap = NULL; | |
376 | result->h_addr_list = host_data->h_addr_ptrs; | |
377 | haveanswer = 0; | |
378 | had_error = 0; | |
379 | ||
380 | while (ancount-- > 0 && cp < end_of_message && had_error == 0) | |
381 | { | |
382 | int type, class; | |
383 | ||
384 | n = dn_expand (answer->buf, end_of_message, cp, bp, linebuflen); | |
385 | if (n < 0 || (*name_ok) (bp) == 0) | |
386 | { | |
387 | ++had_error; | |
388 | continue; | |
389 | } | |
390 | cp += n; /* name */ | |
391 | type = _getshort (cp); | |
392 | cp += INT16SZ; /* type */ | |
393 | class = _getshort(cp); | |
394 | cp += INT16SZ + INT32SZ; /* class, TTL */ | |
395 | n = _getshort(cp); | |
396 | cp += INT16SZ; /* len */ | |
397 | if (class != C_IN) | |
398 | { | |
399 | /* XXX - debug? syslog? */ | |
400 | cp += n; | |
401 | continue; /* XXX - had_error++ ? */ | |
402 | } | |
403 | ||
404 | if ((qtype ==T_A || qtype == T_AAAA) && type == T_CNAME) | |
405 | { | |
406 | if (ap >= &host_data->aliases[MAX_NR_ALIASES - 1]) | |
407 | continue; | |
408 | n = dn_expand (answer->buf, end_of_message, cp, tbuf, sizeof tbuf); | |
409 | if (n < 0 || (*name_ok) (tbuf) == 0) | |
410 | { | |
411 | ++had_error; | |
412 | continue; | |
413 | } | |
414 | cp += n; | |
415 | /* Store alias. */ | |
416 | *ap++ = bp; | |
417 | n = strlen (bp) + 1; /* For the \0. */ | |
76b87c03 UD |
418 | if (n >= MAXHOSTNAMELEN) |
419 | { | |
420 | ++had_error; | |
421 | continue; | |
422 | } | |
5f0e6fc7 RM |
423 | bp += n; |
424 | linebuflen -= n; | |
425 | /* Get canonical name. */ | |
426 | n = strlen (tbuf) + 1; /* For the \0. */ | |
76b87c03 | 427 | if ((size_t) n > buflen || n >= MAXHOSTNAMELEN) |
5f0e6fc7 RM |
428 | { |
429 | ++had_error; | |
430 | continue; | |
431 | } | |
da2d1bc5 | 432 | result->h_name = strcpy (bp, tbuf); /* Cannot overflow. */ |
5f0e6fc7 RM |
433 | bp += n; |
434 | linebuflen -= n; | |
435 | continue; | |
436 | } | |
437 | ||
438 | if (qtype == T_PTR && type == T_CNAME) | |
439 | { | |
440 | n = dn_expand (answer->buf, end_of_message, cp, tbuf, sizeof tbuf); | |
da2d1bc5 | 441 | if (n < 0 || res_dnok (tbuf) == 0) |
5f0e6fc7 RM |
442 | { |
443 | ++had_error; | |
444 | continue; | |
445 | } | |
446 | cp += n; | |
da2d1bc5 | 447 | /* Get canonical name. */ |
5f0e6fc7 | 448 | n = strlen (tbuf) + 1; /* For the \0. */ |
76b87c03 | 449 | if ((size_t) n > buflen || n >= MAXHOSTNAMELEN) |
5f0e6fc7 RM |
450 | { |
451 | ++had_error; | |
452 | continue; | |
453 | } | |
da2d1bc5 | 454 | tname = strcpy (bp, tbuf); /* Cannot overflow. */ |
5f0e6fc7 RM |
455 | bp += n; |
456 | linebuflen -= n; | |
457 | continue; | |
458 | } | |
459 | if (type != qtype) | |
460 | { | |
461 | syslog (LOG_NOTICE | LOG_AUTH, | |
462 | "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"", | |
463 | qname, p_class (C_IN), p_type (qtype), p_type (type)); | |
464 | cp += n; | |
465 | continue; /* XXX - had_error++ ? */ | |
466 | } | |
467 | ||
468 | switch (type) | |
469 | { | |
470 | case T_PTR: | |
471 | if (strcasecmp (tname, bp) != 0) | |
472 | { | |
473 | syslog (LOG_NOTICE | LOG_AUTH, AskedForGot, qname, bp); | |
474 | cp += n; | |
475 | continue; /* XXX - had_error++ ? */ | |
476 | } | |
477 | n = dn_expand (answer->buf, end_of_message, cp, bp, linebuflen); | |
478 | if (n < 0 || res_hnok (bp) == 0) | |
479 | { | |
480 | ++had_error; | |
481 | break; | |
482 | } | |
483 | #if MULTI_PTRS_ARE_ALIASES | |
484 | cp += n; | |
485 | if (haveanswer == 0) | |
486 | result->h_name = bp; | |
487 | else if (ap < &host_data->aliases[MAXALIASES-1]) | |
488 | *ap++ = bp; | |
489 | else | |
490 | n = -1; | |
491 | if (n != -1) | |
492 | { | |
493 | n = strlen (bp) + 1; /* for the \0 */ | |
76b87c03 UD |
494 | if (n >= MAXHOSTNAMELEN) |
495 | { | |
496 | ++had_error; | |
497 | break; | |
498 | } | |
5f0e6fc7 RM |
499 | bp += n; |
500 | linebuflen -= n; | |
501 | } | |
502 | break; | |
503 | #else | |
504 | result->h_name = bp; | |
505 | if (_res.options & RES_USE_INET6) | |
506 | { | |
507 | n = strlen (bp) + 1; /* for the \0 */ | |
76b87c03 UD |
508 | if (n >= MAXHOSTNAMELEN) |
509 | { | |
510 | ++had_error; | |
511 | break; | |
512 | } | |
5f0e6fc7 RM |
513 | bp += n; |
514 | linebuflen -= n; | |
515 | map_v4v6_hostent (result, &bp, &linebuflen); | |
516 | } | |
517 | *h_errnop = NETDB_SUCCESS; | |
518 | return NSS_STATUS_SUCCESS; | |
519 | #endif | |
520 | case T_A: | |
521 | case T_AAAA: | |
522 | if (strcasecmp (result->h_name, bp) != 0) | |
523 | { | |
524 | syslog (LOG_NOTICE | LOG_AUTH, AskedForGot, result->h_name, bp); | |
525 | cp += n; | |
526 | continue; /* XXX - had_error++ ? */ | |
527 | } | |
1f64ac13 | 528 | if (n != result->h_length) |
5f0e6fc7 | 529 | { |
1f64ac13 UD |
530 | cp += n; |
531 | continue; | |
5f0e6fc7 | 532 | } |
1f64ac13 | 533 | if (!haveanswer) |
5f0e6fc7 RM |
534 | { |
535 | register int nn; | |
536 | ||
537 | result->h_name = bp; | |
538 | nn = strlen (bp) + 1; /* for the \0 */ | |
539 | bp += nn; | |
540 | linebuflen -= nn; | |
541 | } | |
542 | ||
543 | bp += sizeof (align) - ((u_long) bp % sizeof (align)); | |
544 | ||
545 | if (n >= linebuflen) | |
546 | { | |
547 | ++had_error; | |
548 | continue; | |
549 | } | |
550 | if (hap >= &host_data->h_addr_ptrs[MAX_NR_ADDRS-1]) | |
551 | { | |
552 | cp += n; | |
553 | continue; | |
554 | } | |
63551311 | 555 | memcpy (*hap++ = bp, cp, n); |
5f0e6fc7 RM |
556 | bp += n; |
557 | cp += n; | |
558 | linebuflen -= n; | |
559 | break; | |
560 | default: | |
561 | abort (); | |
562 | } | |
563 | if (had_error == 0) | |
564 | ++haveanswer; | |
565 | } | |
566 | ||
567 | if (haveanswer > 0) | |
568 | { | |
569 | *ap = NULL; | |
570 | *hap = NULL; | |
da2d1bc5 | 571 | #if defined RESOLVSORT |
5f0e6fc7 RM |
572 | /* |
573 | * Note: we sort even if host can take only one address | |
574 | * in its return structures - should give it the "best" | |
575 | * address in that case, not some random one | |
576 | */ | |
577 | if (_res.nsort && haveanswer > 1 && qtype == T_A) | |
578 | addrsort (host_data->h_addr_ptrs, haveanswer); | |
579 | #endif /*RESOLVSORT*/ | |
580 | ||
581 | if (result->h_name == NULL) | |
582 | { | |
583 | n = strlen (qname) + 1; /* For the \0. */ | |
76b87c03 UD |
584 | if (n > linebuflen || n >= MAXHOSTNAMELEN) |
585 | goto no_recovery; | |
da2d1bc5 | 586 | result->h_name = strcpy (bp, qname); /* Cannot overflow. */ |
5f0e6fc7 RM |
587 | bp += n; |
588 | linebuflen -= n; | |
589 | } | |
590 | ||
591 | if (_res.options & RES_USE_INET6) | |
592 | map_v4v6_hostent (result, &bp, &linebuflen); | |
593 | *h_errnop = NETDB_SUCCESS; | |
594 | return NSS_STATUS_SUCCESS; | |
595 | } | |
76b87c03 UD |
596 | no_recovery: |
597 | *h_errnop = NO_RECOVERY; | |
5f0e6fc7 RM |
598 | return NSS_STATUS_TRYAGAIN; |
599 | } |