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Commit | Line | Data |
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8d8c6efa | 1 | /* Copyright (C) 1996, 1997, 1998, 1999 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. | |
5f0e6fc7 RM |
37 | * 4. Neither the name of the University nor the names of its contributors |
38 | * may be used to endorse or promote products derived from this software | |
39 | * without specific prior written permission. | |
40 | * | |
41 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 | * SUCH DAMAGE. | |
df21c858 UD |
52 | * - |
53 | * Portions Copyright (c) 1993 by Digital Equipment Corporation. | |
54 | * | |
55 | * Permission to use, copy, modify, and distribute this software for any | |
56 | * purpose with or without fee is hereby granted, provided that the above | |
57 | * copyright notice and this permission notice appear in all copies, and that | |
58 | * the name of Digital Equipment Corporation not be used in advertising or | |
59 | * publicity pertaining to distribution of the document or software without | |
60 | * specific, written prior permission. | |
61 | * | |
62 | * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL | |
63 | * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES | |
64 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT | |
65 | * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL | |
66 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR | |
67 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS | |
68 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
69 | * SOFTWARE. | |
70 | * - | |
71 | * --Copyright-- | |
5f0e6fc7 RM |
72 | */ |
73 | ||
74 | #include <ctype.h> | |
75 | #include <errno.h> | |
76 | #include <netdb.h> | |
77 | #include <stdio.h> | |
78 | #include <stdlib.h> | |
79 | #include <stddef.h> | |
80 | #include <string.h> | |
81 | #include <sys/syslog.h> | |
82 | ||
5f0e6fc7 RM |
83 | #include "nsswitch.h" |
84 | ||
85 | /* Get implementation for some internal functions. */ | |
da2d1bc5 UD |
86 | #include <resolv/mapv4v6addr.h> |
87 | #include <resolv/mapv4v6hostent.h> | |
5f0e6fc7 RM |
88 | |
89 | /* Maximum number of aliases we allow. */ | |
90 | #define MAX_NR_ALIASES 48 | |
91 | #define MAX_NR_ADDRS 48 | |
92 | ||
93 | #if PACKETSZ > 1024 | |
94 | # define MAXPACKET PACKETSZ | |
95 | #else | |
96 | # define MAXPACKET 1024 | |
97 | #endif | |
1522c368 UD |
98 | /* As per RFC 1034 and 1035 a host name cannot exceed 255 octets in length. */ |
99 | #ifdef MAXHOSTNAMELEN | |
100 | # undef MAXHOSTNAMELEN | |
101 | #endif | |
102 | #define MAXHOSTNAMELEN 256 | |
5f0e6fc7 RM |
103 | |
104 | static const char AskedForGot[] = "\ | |
105 | gethostby*.getanswer: asked for \"%s\", got \"%s\""; | |
106 | ||
107 | ||
108 | /* We need this time later. */ | |
109 | typedef union querybuf | |
110 | { | |
111 | HEADER hdr; | |
112 | u_char buf[MAXPACKET]; | |
113 | } querybuf; | |
114 | ||
8d8c6efa UD |
115 | /* These functions are defined in res_comp.c. */ |
116 | #define NS_MAXCDNAME 255 /* maximum compressed domain name */ | |
117 | extern int __ns_name_ntop __P ((const u_char *, char *, size_t)); | |
118 | extern int __ns_name_unpack __P ((const u_char *, const u_char *, | |
119 | const u_char *, u_char *, size_t)); | |
120 | ||
5f0e6fc7 RM |
121 | |
122 | static enum nss_status getanswer_r (const querybuf *answer, int anslen, | |
123 | const char *qname, int qtype, | |
df4ef2ab | 124 | struct hostent *result, char *buffer, |
67479a70 | 125 | size_t buflen, int *errnop, int *h_errnop); |
5f0e6fc7 RM |
126 | |
127 | enum nss_status | |
128 | _nss_dns_gethostbyname2_r (const char *name, int af, struct hostent *result, | |
67479a70 UD |
129 | char *buffer, size_t buflen, int *errnop, |
130 | int *h_errnop) | |
5f0e6fc7 | 131 | { |
5f0e6fc7 RM |
132 | querybuf host_buffer; |
133 | int size, type, n; | |
134 | const char *cp; | |
135 | ||
136 | switch (af) { | |
137 | case AF_INET: | |
138 | size = INADDRSZ; | |
139 | type = T_A; | |
140 | break; | |
141 | case AF_INET6: | |
142 | size = IN6ADDRSZ; | |
143 | type = T_AAAA; | |
144 | break; | |
145 | default: | |
146 | *h_errnop = NETDB_INTERNAL; | |
67479a70 | 147 | *errnop = EAFNOSUPPORT; |
5f0e6fc7 RM |
148 | return NSS_STATUS_UNAVAIL; |
149 | } | |
150 | ||
151 | result->h_addrtype = af; | |
152 | result->h_length = size; | |
153 | ||
154 | /* | |
155 | * if there aren't any dots, it could be a user-level alias. | |
156 | * this is also done in res_query() since we are not the only | |
157 | * function that looks up host names. | |
158 | */ | |
159 | if (strchr (name, '.') == NULL && (cp = __hostalias (name)) != NULL) | |
160 | name = cp; | |
161 | ||
795fbc9a | 162 | n = res_search (name, C_IN, type, host_buffer.buf, sizeof (host_buffer.buf)); |
5f0e6fc7 | 163 | if (n < 0) |
dd7d45e8 UD |
164 | { |
165 | *h_errnop = h_errno; | |
67479a70 | 166 | *errnop = errno; |
dd7d45e8 UD |
167 | return errno == ECONNREFUSED ? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND; |
168 | } | |
5f0e6fc7 RM |
169 | |
170 | return getanswer_r (&host_buffer, n, name, type, result, buffer, buflen, | |
67479a70 | 171 | errnop, h_errnop); |
5f0e6fc7 RM |
172 | } |
173 | ||
174 | ||
175 | enum nss_status | |
176 | _nss_dns_gethostbyname_r (const char *name, struct hostent *result, | |
67479a70 UD |
177 | char *buffer, size_t buflen, int *errnop, |
178 | int *h_errnop) | |
5f0e6fc7 RM |
179 | { |
180 | enum nss_status status = NSS_STATUS_NOTFOUND; | |
181 | ||
182 | if (_res.options & RES_USE_INET6) | |
183 | status = _nss_dns_gethostbyname2_r (name, AF_INET6, result, buffer, | |
67479a70 | 184 | buflen, errnop, h_errnop); |
5f0e6fc7 RM |
185 | if (status == NSS_STATUS_NOTFOUND) |
186 | status = _nss_dns_gethostbyname2_r (name, AF_INET, result, buffer, | |
67479a70 | 187 | buflen, errnop, h_errnop); |
5f0e6fc7 RM |
188 | |
189 | return status; | |
190 | } | |
191 | ||
192 | ||
193 | enum nss_status | |
194 | _nss_dns_gethostbyaddr_r (const char *addr, int len, int af, | |
df4ef2ab | 195 | struct hostent *result, char *buffer, size_t buflen, |
67479a70 | 196 | int *errnop, int *h_errnop) |
5f0e6fc7 RM |
197 | { |
198 | static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff }; | |
199 | static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 }; | |
200 | const u_char *uaddr = (const u_char *)addr; | |
201 | struct host_data | |
202 | { | |
203 | char *aliases[MAX_NR_ALIASES]; | |
204 | unsigned char host_addr[16]; /* IPv4 or IPv6 */ | |
205 | char *h_addr_ptrs[MAX_NR_ADDRS + 1]; | |
206 | char linebuffer[0]; | |
207 | } *host_data = (struct host_data *) buffer; | |
208 | querybuf host_buffer; | |
209 | char qbuf[MAXDNAME+1], *qp; | |
210 | int size, n, status; | |
211 | ||
212 | if (af == AF_INET6 && len == IN6ADDRSZ && | |
63551311 UD |
213 | (memcmp (uaddr, mapped, sizeof mapped) == 0 |
214 | || memcmp (uaddr, tunnelled, sizeof tunnelled) == 0)) | |
5f0e6fc7 RM |
215 | { |
216 | /* Unmap. */ | |
217 | addr += sizeof mapped; | |
218 | uaddr += sizeof mapped; | |
219 | af = AF_INET; | |
220 | len = INADDRSZ; | |
221 | } | |
222 | ||
223 | switch (af) | |
224 | { | |
225 | case AF_INET: | |
226 | size = INADDRSZ; | |
227 | break; | |
228 | case AF_INET6: | |
229 | size = IN6ADDRSZ; | |
230 | break; | |
231 | default: | |
67479a70 | 232 | *errnop = EAFNOSUPPORT; |
5f0e6fc7 RM |
233 | *h_errnop = NETDB_INTERNAL; |
234 | return NSS_STATUS_UNAVAIL; | |
235 | } | |
236 | if (size != len) | |
237 | { | |
67479a70 | 238 | *errnop = EAFNOSUPPORT; |
5f0e6fc7 RM |
239 | *h_errnop = NETDB_INTERNAL; |
240 | return NSS_STATUS_UNAVAIL; | |
241 | } | |
242 | ||
243 | switch (af) | |
244 | { | |
245 | case AF_INET: | |
246 | sprintf (qbuf, "%u.%u.%u.%u.in-addr.arpa", (uaddr[3] & 0xff), | |
247 | (uaddr[2] & 0xff), (uaddr[1] & 0xff), (uaddr[0] & 0xff)); | |
248 | break; | |
249 | case AF_INET6: | |
250 | qp = qbuf; | |
251 | for (n = IN6ADDRSZ - 1; n >= 0; n--) | |
252 | qp += sprintf (qp, "%x.%x.", uaddr[n] & 0xf, (uaddr[n] >> 4) & 0xf); | |
da2d1bc5 | 253 | strcpy (qp, "ip6.int"); |
5f0e6fc7 RM |
254 | break; |
255 | default: | |
256 | /* Cannot happen. */ | |
257 | } | |
258 | ||
259 | n = res_query (qbuf, C_IN, T_PTR, (u_char *)host_buffer.buf, | |
260 | sizeof host_buffer); | |
261 | if (n < 0) | |
dd7d45e8 UD |
262 | { |
263 | *h_errnop = h_errno; | |
67479a70 | 264 | *errnop = errno; |
dd7d45e8 UD |
265 | return errno == ECONNREFUSED ? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND; |
266 | } | |
5f0e6fc7 RM |
267 | |
268 | status = getanswer_r (&host_buffer, n, qbuf, T_PTR, result, buffer, buflen, | |
67479a70 | 269 | errnop, h_errnop); |
5f0e6fc7 | 270 | if (status != NSS_STATUS_SUCCESS) |
dd7d45e8 UD |
271 | { |
272 | *h_errnop = h_errno; | |
67479a70 | 273 | *errnop = errno; |
dd7d45e8 UD |
274 | return status; |
275 | } | |
5f0e6fc7 RM |
276 | |
277 | #ifdef SUNSECURITY | |
278 | This is not implemented because it is not possible to use the current | |
279 | source from bind in a multi-threaded program. | |
280 | #endif | |
281 | ||
282 | result->h_addrtype = af; | |
283 | result->h_length = len; | |
63551311 | 284 | memcpy (host_data->host_addr, addr, len); |
5f0e6fc7 RM |
285 | host_data->h_addr_ptrs[0] = (char *) host_data->host_addr; |
286 | host_data->h_addr_ptrs[1] = NULL; | |
287 | if (af == AF_INET && (_res.options & RES_USE_INET6)) | |
288 | { | |
289 | map_v4v6_address ((char *) host_data->host_addr, | |
290 | (char *) host_data->host_addr); | |
291 | result->h_addrtype = AF_INET6; | |
292 | result->h_length = IN6ADDRSZ; | |
293 | } | |
294 | *h_errnop = NETDB_SUCCESS; | |
295 | return NSS_STATUS_SUCCESS; | |
296 | } | |
297 | ||
298 | ||
299 | static enum nss_status | |
300 | getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, | |
df4ef2ab | 301 | struct hostent *result, char *buffer, size_t buflen, |
67479a70 | 302 | int *errnop, int *h_errnop) |
5f0e6fc7 RM |
303 | { |
304 | struct host_data | |
305 | { | |
306 | char *aliases[MAX_NR_ALIASES]; | |
307 | unsigned char host_addr[16]; /* IPv4 or IPv6 */ | |
308 | char *h_addr_ptrs[MAX_NR_ADDRS + 1]; | |
309 | char linebuffer[0]; | |
310 | } *host_data = (struct host_data *) buffer; | |
311 | int linebuflen = buflen - offsetof (struct host_data, linebuffer); | |
312 | register const HEADER *hp; | |
313 | const u_char *end_of_message, *cp; | |
314 | int n, ancount, qdcount; | |
315 | int haveanswer, had_error; | |
316 | char *bp, **ap, **hap; | |
845dcb57 | 317 | char tbuf[MAXDNAME]; |
5f0e6fc7 RM |
318 | const char *tname; |
319 | int (*name_ok) __P ((const char *)); | |
8d8c6efa | 320 | u_char packtmp[NS_MAXCDNAME]; |
5f0e6fc7 RM |
321 | |
322 | tname = qname; | |
323 | result->h_name = NULL; | |
324 | end_of_message = answer->buf + anslen; | |
325 | switch (qtype) | |
326 | { | |
327 | case T_A: | |
328 | case T_AAAA: | |
329 | name_ok = res_hnok; | |
330 | break; | |
331 | case T_PTR: | |
332 | name_ok = res_dnok; | |
333 | break; | |
334 | default: | |
335 | return NSS_STATUS_UNAVAIL; /* XXX should be abort(); */ | |
336 | } | |
337 | ||
338 | /* | |
339 | * find first satisfactory answer | |
340 | */ | |
341 | hp = &answer->hdr; | |
342 | bp = host_data->linebuffer; | |
343 | ancount = ntohs (hp->ancount); | |
344 | qdcount = ntohs (hp->qdcount); | |
345 | cp = answer->buf + HFIXEDSZ; | |
346 | if (qdcount != 1) | |
347 | { | |
348 | *h_errnop = NO_RECOVERY; | |
349 | return NSS_STATUS_UNAVAIL; | |
350 | } | |
351 | ||
8d8c6efa UD |
352 | n = __ns_name_unpack (answer->buf, end_of_message, cp, |
353 | packtmp, sizeof packtmp); | |
354 | if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) | |
5f0e6fc7 | 355 | { |
67479a70 UD |
356 | if (errno == EMSGSIZE) |
357 | { | |
67479a70 UD |
358 | *errnop = ERANGE; |
359 | *h_errnop = NETDB_INTERNAL; | |
8d8c6efa | 360 | return NSS_STATUS_TRYAGAIN; |
67479a70 | 361 | } |
8d8c6efa UD |
362 | |
363 | n = -1; | |
364 | } | |
365 | ||
366 | if (n > 0 && bp[0] == '.') | |
367 | bp[0] = '\0'; | |
368 | ||
369 | if (n < 0 || (*name_ok) (bp) == 0) | |
370 | { | |
371 | *errnop = errno; | |
372 | *h_errnop = NO_RECOVERY; | |
5f0e6fc7 RM |
373 | return NSS_STATUS_UNAVAIL; |
374 | } | |
375 | cp += n + QFIXEDSZ; | |
376 | ||
377 | if (qtype == T_A || qtype == T_AAAA) | |
378 | { | |
379 | /* res_send() has already verified that the query name is the | |
380 | * same as the one we sent; this just gets the expanded name | |
381 | * (i.e., with the succeeding search-domain tacked on). | |
382 | */ | |
383 | n = strlen (bp) + 1; /* for the \0 */ | |
76b87c03 UD |
384 | if (n >= MAXHOSTNAMELEN) |
385 | { | |
67479a70 | 386 | *h_errnop = NO_RECOVERY; |
76b87c03 UD |
387 | return NSS_STATUS_TRYAGAIN; |
388 | } | |
5f0e6fc7 RM |
389 | result->h_name = bp; |
390 | bp += n; | |
391 | linebuflen -= n; | |
392 | /* The qname can be abbreviated, but h_name is now absolute. */ | |
393 | qname = result->h_name; | |
394 | } | |
395 | ||
396 | ap = host_data->aliases; | |
397 | *ap = NULL; | |
398 | result->h_aliases = host_data->aliases; | |
399 | hap = host_data->h_addr_ptrs; | |
400 | *hap = NULL; | |
401 | result->h_addr_list = host_data->h_addr_ptrs; | |
402 | haveanswer = 0; | |
403 | had_error = 0; | |
404 | ||
405 | while (ancount-- > 0 && cp < end_of_message && had_error == 0) | |
406 | { | |
407 | int type, class; | |
408 | ||
8d8c6efa UD |
409 | n = __ns_name_unpack (answer->buf, end_of_message, cp, |
410 | packtmp, sizeof packtmp); | |
411 | if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) | |
412 | { | |
413 | if (errno == EMSGSIZE) | |
414 | { | |
415 | *errnop = ERANGE; | |
416 | *h_errnop = NETDB_INTERNAL; | |
417 | return NSS_STATUS_TRYAGAIN; | |
418 | } | |
419 | ||
420 | n = -1; | |
421 | } | |
422 | ||
5f0e6fc7 RM |
423 | if (n < 0 || (*name_ok) (bp) == 0) |
424 | { | |
425 | ++had_error; | |
426 | continue; | |
427 | } | |
428 | cp += n; /* name */ | |
429 | type = _getshort (cp); | |
430 | cp += INT16SZ; /* type */ | |
8d8c6efa | 431 | class = _getshort (cp); |
5f0e6fc7 | 432 | cp += INT16SZ + INT32SZ; /* class, TTL */ |
8d8c6efa | 433 | n = _getshort (cp); |
5f0e6fc7 RM |
434 | cp += INT16SZ; /* len */ |
435 | if (class != C_IN) | |
436 | { | |
437 | /* XXX - debug? syslog? */ | |
438 | cp += n; | |
439 | continue; /* XXX - had_error++ ? */ | |
440 | } | |
441 | ||
442 | if ((qtype ==T_A || qtype == T_AAAA) && type == T_CNAME) | |
443 | { | |
444 | if (ap >= &host_data->aliases[MAX_NR_ALIASES - 1]) | |
445 | continue; | |
446 | n = dn_expand (answer->buf, end_of_message, cp, tbuf, sizeof tbuf); | |
447 | if (n < 0 || (*name_ok) (tbuf) == 0) | |
448 | { | |
449 | ++had_error; | |
450 | continue; | |
451 | } | |
452 | cp += n; | |
453 | /* Store alias. */ | |
454 | *ap++ = bp; | |
455 | n = strlen (bp) + 1; /* For the \0. */ | |
76b87c03 UD |
456 | if (n >= MAXHOSTNAMELEN) |
457 | { | |
458 | ++had_error; | |
459 | continue; | |
460 | } | |
5f0e6fc7 RM |
461 | bp += n; |
462 | linebuflen -= n; | |
463 | /* Get canonical name. */ | |
464 | n = strlen (tbuf) + 1; /* For the \0. */ | |
76b87c03 | 465 | if ((size_t) n > buflen || n >= MAXHOSTNAMELEN) |
5f0e6fc7 RM |
466 | { |
467 | ++had_error; | |
468 | continue; | |
469 | } | |
8d8c6efa UD |
470 | result->h_name = bp; |
471 | bp = __mempcpy (bp, tbuf, n); /* Cannot overflow. */ | |
5f0e6fc7 RM |
472 | linebuflen -= n; |
473 | continue; | |
474 | } | |
475 | ||
476 | if (qtype == T_PTR && type == T_CNAME) | |
477 | { | |
478 | n = dn_expand (answer->buf, end_of_message, cp, tbuf, sizeof tbuf); | |
da2d1bc5 | 479 | if (n < 0 || res_dnok (tbuf) == 0) |
5f0e6fc7 RM |
480 | { |
481 | ++had_error; | |
482 | continue; | |
483 | } | |
484 | cp += n; | |
da2d1bc5 | 485 | /* Get canonical name. */ |
5f0e6fc7 | 486 | n = strlen (tbuf) + 1; /* For the \0. */ |
76b87c03 | 487 | if ((size_t) n > buflen || n >= MAXHOSTNAMELEN) |
5f0e6fc7 RM |
488 | { |
489 | ++had_error; | |
490 | continue; | |
491 | } | |
8d8c6efa UD |
492 | tname = bp; |
493 | bp = __mempcpy (bp, tbuf, n); /* Cannot overflow. */ | |
5f0e6fc7 RM |
494 | linebuflen -= n; |
495 | continue; | |
496 | } | |
1bc21e7a UD |
497 | if (type == T_SIG || type == T_KEY || type == T_NXT) |
498 | { | |
499 | /* We don't support DNSSEC yet. For now, ignore the record | |
500 | and send a low priority message to syslog. */ | |
501 | syslog (LOG_DEBUG | LOG_AUTH, | |
502 | "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"", | |
503 | qname, p_class (C_IN), p_type(qtype), p_type (type)); | |
504 | cp += n; | |
505 | continue; | |
506 | } | |
5f0e6fc7 RM |
507 | if (type != qtype) |
508 | { | |
509 | syslog (LOG_NOTICE | LOG_AUTH, | |
510 | "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"", | |
511 | qname, p_class (C_IN), p_type (qtype), p_type (type)); | |
512 | cp += n; | |
513 | continue; /* XXX - had_error++ ? */ | |
514 | } | |
515 | ||
516 | switch (type) | |
517 | { | |
518 | case T_PTR: | |
8d8c6efa | 519 | if (__strcasecmp (tname, bp) != 0) |
5f0e6fc7 RM |
520 | { |
521 | syslog (LOG_NOTICE | LOG_AUTH, AskedForGot, qname, bp); | |
522 | cp += n; | |
523 | continue; /* XXX - had_error++ ? */ | |
524 | } | |
8d8c6efa UD |
525 | |
526 | n = __ns_name_unpack (answer->buf, end_of_message, cp, | |
527 | packtmp, sizeof packtmp); | |
528 | if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) | |
529 | { | |
530 | if (errno == EMSGSIZE) | |
531 | { | |
532 | *errnop = ERANGE; | |
533 | *h_errnop = NETDB_INTERNAL; | |
534 | return NSS_STATUS_TRYAGAIN; | |
535 | } | |
536 | ||
537 | n = -1; | |
538 | } | |
539 | ||
5f0e6fc7 RM |
540 | if (n < 0 || res_hnok (bp) == 0) |
541 | { | |
542 | ++had_error; | |
543 | break; | |
544 | } | |
545 | #if MULTI_PTRS_ARE_ALIASES | |
546 | cp += n; | |
547 | if (haveanswer == 0) | |
548 | result->h_name = bp; | |
549 | else if (ap < &host_data->aliases[MAXALIASES-1]) | |
550 | *ap++ = bp; | |
551 | else | |
552 | n = -1; | |
553 | if (n != -1) | |
554 | { | |
555 | n = strlen (bp) + 1; /* for the \0 */ | |
76b87c03 UD |
556 | if (n >= MAXHOSTNAMELEN) |
557 | { | |
558 | ++had_error; | |
559 | break; | |
560 | } | |
5f0e6fc7 RM |
561 | bp += n; |
562 | linebuflen -= n; | |
563 | } | |
564 | break; | |
565 | #else | |
566 | result->h_name = bp; | |
567 | if (_res.options & RES_USE_INET6) | |
568 | { | |
569 | n = strlen (bp) + 1; /* for the \0 */ | |
76b87c03 UD |
570 | if (n >= MAXHOSTNAMELEN) |
571 | { | |
572 | ++had_error; | |
573 | break; | |
574 | } | |
5f0e6fc7 RM |
575 | bp += n; |
576 | linebuflen -= n; | |
577 | map_v4v6_hostent (result, &bp, &linebuflen); | |
578 | } | |
579 | *h_errnop = NETDB_SUCCESS; | |
580 | return NSS_STATUS_SUCCESS; | |
581 | #endif | |
582 | case T_A: | |
583 | case T_AAAA: | |
584 | if (strcasecmp (result->h_name, bp) != 0) | |
585 | { | |
586 | syslog (LOG_NOTICE | LOG_AUTH, AskedForGot, result->h_name, bp); | |
587 | cp += n; | |
588 | continue; /* XXX - had_error++ ? */ | |
589 | } | |
1f64ac13 | 590 | if (n != result->h_length) |
5f0e6fc7 | 591 | { |
1f64ac13 UD |
592 | cp += n; |
593 | continue; | |
5f0e6fc7 | 594 | } |
1f64ac13 | 595 | if (!haveanswer) |
5f0e6fc7 RM |
596 | { |
597 | register int nn; | |
598 | ||
599 | result->h_name = bp; | |
600 | nn = strlen (bp) + 1; /* for the \0 */ | |
601 | bp += nn; | |
602 | linebuflen -= nn; | |
603 | } | |
604 | ||
605 | bp += sizeof (align) - ((u_long) bp % sizeof (align)); | |
606 | ||
607 | if (n >= linebuflen) | |
608 | { | |
609 | ++had_error; | |
610 | continue; | |
611 | } | |
612 | if (hap >= &host_data->h_addr_ptrs[MAX_NR_ADDRS-1]) | |
613 | { | |
614 | cp += n; | |
615 | continue; | |
616 | } | |
8d8c6efa | 617 | bp = __mempcpy (*hap++ = bp, cp, n); |
5f0e6fc7 RM |
618 | cp += n; |
619 | linebuflen -= n; | |
620 | break; | |
621 | default: | |
622 | abort (); | |
623 | } | |
624 | if (had_error == 0) | |
625 | ++haveanswer; | |
626 | } | |
627 | ||
628 | if (haveanswer > 0) | |
629 | { | |
630 | *ap = NULL; | |
631 | *hap = NULL; | |
da2d1bc5 | 632 | #if defined RESOLVSORT |
5f0e6fc7 RM |
633 | /* |
634 | * Note: we sort even if host can take only one address | |
635 | * in its return structures - should give it the "best" | |
636 | * address in that case, not some random one | |
637 | */ | |
638 | if (_res.nsort && haveanswer > 1 && qtype == T_A) | |
639 | addrsort (host_data->h_addr_ptrs, haveanswer); | |
640 | #endif /*RESOLVSORT*/ | |
641 | ||
642 | if (result->h_name == NULL) | |
643 | { | |
644 | n = strlen (qname) + 1; /* For the \0. */ | |
8d8c6efa UD |
645 | if (n > linebuflen) |
646 | { | |
647 | *errnop = ERANGE; | |
648 | *h_errnop = NETDB_INTERNAL; | |
649 | return NSS_STATUS_TRYAGAIN; | |
650 | } | |
651 | if (n >= MAXHOSTNAMELEN) | |
76b87c03 | 652 | goto no_recovery; |
8d8c6efa UD |
653 | result->h_name = bp; |
654 | bp = __mempcpy (bp, qname, n); /* Cannot overflow. */ | |
5f0e6fc7 RM |
655 | linebuflen -= n; |
656 | } | |
657 | ||
658 | if (_res.options & RES_USE_INET6) | |
659 | map_v4v6_hostent (result, &bp, &linebuflen); | |
660 | *h_errnop = NETDB_SUCCESS; | |
661 | return NSS_STATUS_SUCCESS; | |
662 | } | |
76b87c03 UD |
663 | no_recovery: |
664 | *h_errnop = NO_RECOVERY; | |
5f0e6fc7 RM |
665 | return NSS_STATUS_TRYAGAIN; |
666 | } |