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Commit | Line | Data |
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65b4743a | 1 | /* Copyright (C) 1996-2004, 2007, 2008 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 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the 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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
5f0e6fc7 | 14 | |
41bdb6e2 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 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 | 88 | |
5db91571 UD |
89 | #define RESOLVSORT |
90 | ||
5f0e6fc7 RM |
91 | /* Maximum number of aliases we allow. */ |
92 | #define MAX_NR_ALIASES 48 | |
93 | #define MAX_NR_ADDRS 48 | |
94 | ||
e2dced82 | 95 | #if PACKETSZ > 65536 |
5f0e6fc7 RM |
96 | # define MAXPACKET PACKETSZ |
97 | #else | |
e2dced82 | 98 | # define MAXPACKET 65536 |
5f0e6fc7 | 99 | #endif |
1522c368 UD |
100 | /* As per RFC 1034 and 1035 a host name cannot exceed 255 octets in length. */ |
101 | #ifdef MAXHOSTNAMELEN | |
102 | # undef MAXHOSTNAMELEN | |
103 | #endif | |
104 | #define MAXHOSTNAMELEN 256 | |
5f0e6fc7 RM |
105 | |
106 | static const char AskedForGot[] = "\ | |
107 | gethostby*.getanswer: asked for \"%s\", got \"%s\""; | |
108 | ||
109 | ||
110 | /* We need this time later. */ | |
111 | typedef union querybuf | |
112 | { | |
113 | HEADER hdr; | |
114 | u_char buf[MAXPACKET]; | |
115 | } querybuf; | |
116 | ||
8d8c6efa UD |
117 | /* These functions are defined in res_comp.c. */ |
118 | #define NS_MAXCDNAME 255 /* maximum compressed domain name */ | |
b455972f UD |
119 | extern int __ns_name_ntop (const u_char *, char *, size_t); |
120 | extern int __ns_name_unpack (const u_char *, const u_char *, | |
121 | const u_char *, u_char *, size_t); | |
8d8c6efa | 122 | |
5f0e6fc7 RM |
123 | |
124 | static enum nss_status getanswer_r (const querybuf *answer, int anslen, | |
125 | const char *qname, int qtype, | |
df4ef2ab | 126 | struct hostent *result, char *buffer, |
b455972f | 127 | size_t buflen, int *errnop, int *h_errnop, |
d1fe1f22 | 128 | int map, int32_t *ttlp, char **canonp); |
5f0e6fc7 | 129 | |
78d8d211 UD |
130 | extern enum nss_status _nss_dns_gethostbyname3_r (const char *name, int af, |
131 | struct hostent *result, | |
132 | char *buffer, size_t buflen, | |
133 | int *errnop, int *h_errnop, | |
134 | int32_t *ttlp, | |
135 | char **canonp); | |
136 | hidden_proto (_nss_dns_gethostbyname3_r) | |
137 | ||
5f0e6fc7 | 138 | enum nss_status |
d1fe1f22 | 139 | _nss_dns_gethostbyname3_r (const char *name, int af, struct hostent *result, |
67479a70 | 140 | char *buffer, size_t buflen, int *errnop, |
d1fe1f22 | 141 | int *h_errnop, int32_t *ttlp, char **canonp) |
5f0e6fc7 | 142 | { |
16b66062 AJ |
143 | union |
144 | { | |
145 | querybuf *buf; | |
146 | u_char *ptr; | |
147 | } host_buffer; | |
148 | querybuf *orig_host_buffer; | |
f80f1a4a | 149 | char tmp[NS_MAXDNAME]; |
5f0e6fc7 RM |
150 | int size, type, n; |
151 | const char *cp; | |
0420d888 | 152 | int map = 0; |
34816665 | 153 | int olderr = errno; |
6166815d | 154 | enum nss_status status; |
5f0e6fc7 | 155 | |
87bb6b6c | 156 | if (__res_maybe_init (&_res, 0) == -1) |
b43b13ac UD |
157 | return NSS_STATUS_UNAVAIL; |
158 | ||
5f0e6fc7 RM |
159 | switch (af) { |
160 | case AF_INET: | |
161 | size = INADDRSZ; | |
162 | type = T_A; | |
163 | break; | |
164 | case AF_INET6: | |
165 | size = IN6ADDRSZ; | |
166 | type = T_AAAA; | |
167 | break; | |
168 | default: | |
0cc70fcf | 169 | *h_errnop = NO_DATA; |
67479a70 | 170 | *errnop = EAFNOSUPPORT; |
5f0e6fc7 RM |
171 | return NSS_STATUS_UNAVAIL; |
172 | } | |
173 | ||
174 | result->h_addrtype = af; | |
175 | result->h_length = size; | |
176 | ||
177 | /* | |
178 | * if there aren't any dots, it could be a user-level alias. | |
179 | * this is also done in res_query() since we are not the only | |
180 | * function that looks up host names. | |
181 | */ | |
f80f1a4a UD |
182 | if (strchr (name, '.') == NULL |
183 | && (cp = res_hostalias (&_res, name, tmp, sizeof (tmp))) != NULL) | |
5f0e6fc7 RM |
184 | name = cp; |
185 | ||
16b66062 | 186 | host_buffer.buf = orig_host_buffer = (querybuf *) alloca (1024); |
6166815d | 187 | |
16b66062 AJ |
188 | n = __libc_res_nsearch (&_res, name, C_IN, type, host_buffer.buf->buf, |
189 | 1024, &host_buffer.ptr); | |
5f0e6fc7 | 190 | if (n < 0) |
dd7d45e8 | 191 | { |
b455972f UD |
192 | enum nss_status status = (errno == ECONNREFUSED |
193 | ? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND); | |
dd7d45e8 | 194 | *h_errnop = h_errno; |
34816665 UD |
195 | if (h_errno == TRY_AGAIN) |
196 | *errnop = EAGAIN; | |
197 | else | |
198 | __set_errno (olderr); | |
b455972f UD |
199 | |
200 | /* If we are looking for a IPv6 address and mapping is enabled | |
201 | by having the RES_USE_INET6 bit in _res.options set, we try | |
202 | another lookup. */ | |
203 | if (af == AF_INET6 && (_res.options & RES_USE_INET6)) | |
16b66062 AJ |
204 | n = __libc_res_nsearch (&_res, name, C_IN, T_A, host_buffer.buf->buf, |
205 | host_buffer.buf != orig_host_buffer | |
206 | ? MAXPACKET : 1024, &host_buffer.ptr); | |
b455972f UD |
207 | |
208 | if (n < 0) | |
6166815d | 209 | { |
16b66062 AJ |
210 | if (host_buffer.buf != orig_host_buffer) |
211 | free (host_buffer.buf); | |
6166815d UD |
212 | return status; |
213 | } | |
b455972f UD |
214 | |
215 | map = 1; | |
216 | ||
217 | result->h_addrtype = AF_INET; | |
2884dad4 | 218 | result->h_length = INADDRSZ; |
dd7d45e8 | 219 | } |
5f0e6fc7 | 220 | |
16b66062 | 221 | status = getanswer_r (host_buffer.buf, n, name, type, result, buffer, buflen, |
d1fe1f22 | 222 | errnop, h_errnop, map, ttlp, canonp); |
16b66062 AJ |
223 | if (host_buffer.buf != orig_host_buffer) |
224 | free (host_buffer.buf); | |
6166815d | 225 | return status; |
5f0e6fc7 | 226 | } |
78d8d211 | 227 | hidden_def (_nss_dns_gethostbyname3_r) |
5f0e6fc7 RM |
228 | |
229 | ||
d1fe1f22 UD |
230 | enum nss_status |
231 | _nss_dns_gethostbyname2_r (const char *name, int af, struct hostent *result, | |
232 | char *buffer, size_t buflen, int *errnop, | |
233 | int *h_errnop) | |
234 | { | |
235 | return _nss_dns_gethostbyname3_r (name, af, result, buffer, buflen, errnop, | |
236 | h_errnop, NULL, NULL); | |
237 | } | |
238 | ||
239 | ||
5f0e6fc7 RM |
240 | enum nss_status |
241 | _nss_dns_gethostbyname_r (const char *name, struct hostent *result, | |
67479a70 UD |
242 | char *buffer, size_t buflen, int *errnop, |
243 | int *h_errnop) | |
5f0e6fc7 RM |
244 | { |
245 | enum nss_status status = NSS_STATUS_NOTFOUND; | |
246 | ||
247 | if (_res.options & RES_USE_INET6) | |
78d8d211 UD |
248 | status = _nss_dns_gethostbyname3_r (name, AF_INET6, result, buffer, |
249 | buflen, errnop, h_errnop, NULL, NULL); | |
5f0e6fc7 | 250 | if (status == NSS_STATUS_NOTFOUND) |
78d8d211 UD |
251 | status = _nss_dns_gethostbyname3_r (name, AF_INET, result, buffer, |
252 | buflen, errnop, h_errnop, NULL, NULL); | |
5f0e6fc7 RM |
253 | |
254 | return status; | |
255 | } | |
256 | ||
257 | ||
31e2791c UD |
258 | extern enum nss_status _nss_dns_gethostbyaddr2_r (const void *addr, |
259 | socklen_t len, int af, | |
260 | struct hostent *result, | |
261 | char *buffer, size_t buflen, | |
262 | int *errnop, int *h_errnop, | |
263 | int32_t *ttlp); | |
264 | hidden_proto (_nss_dns_gethostbyaddr2_r) | |
265 | ||
5f0e6fc7 | 266 | enum nss_status |
31e2791c UD |
267 | _nss_dns_gethostbyaddr2_r (const void *addr, socklen_t len, int af, |
268 | struct hostent *result, char *buffer, size_t buflen, | |
269 | int *errnop, int *h_errnop, int32_t *ttlp) | |
5f0e6fc7 RM |
270 | { |
271 | static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff }; | |
272 | static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 }; | |
20cc4c87 | 273 | static const u_char v6local[] = { 0,0, 0,1 }; |
5f0e6fc7 RM |
274 | const u_char *uaddr = (const u_char *)addr; |
275 | struct host_data | |
276 | { | |
277 | char *aliases[MAX_NR_ALIASES]; | |
278 | unsigned char host_addr[16]; /* IPv4 or IPv6 */ | |
279 | char *h_addr_ptrs[MAX_NR_ADDRS + 1]; | |
280 | char linebuffer[0]; | |
281 | } *host_data = (struct host_data *) buffer; | |
16b66062 AJ |
282 | union |
283 | { | |
284 | querybuf *buf; | |
285 | u_char *ptr; | |
286 | } host_buffer; | |
287 | querybuf *orig_host_buffer; | |
1f3f143e | 288 | char qbuf[MAXDNAME+1], *qp = NULL; |
30f22ab1 | 289 | size_t size; |
0420d888 | 290 | int n, status; |
34816665 | 291 | int olderr = errno; |
5f0e6fc7 | 292 | |
87bb6b6c | 293 | if (__res_maybe_init (&_res, 0) == -1) |
b43b13ac UD |
294 | return NSS_STATUS_UNAVAIL; |
295 | ||
20cc4c87 UD |
296 | if (af == AF_INET6 && len == IN6ADDRSZ |
297 | && (memcmp (uaddr, mapped, sizeof mapped) == 0 | |
298 | || (memcmp (uaddr, tunnelled, sizeof tunnelled) == 0 | |
299 | && memcmp (&uaddr[sizeof tunnelled], v6local, sizeof v6local)))) | |
5f0e6fc7 RM |
300 | { |
301 | /* Unmap. */ | |
302 | addr += sizeof mapped; | |
303 | uaddr += sizeof mapped; | |
304 | af = AF_INET; | |
305 | len = INADDRSZ; | |
306 | } | |
307 | ||
308 | switch (af) | |
309 | { | |
310 | case AF_INET: | |
311 | size = INADDRSZ; | |
312 | break; | |
313 | case AF_INET6: | |
314 | size = IN6ADDRSZ; | |
315 | break; | |
316 | default: | |
67479a70 | 317 | *errnop = EAFNOSUPPORT; |
5f0e6fc7 RM |
318 | *h_errnop = NETDB_INTERNAL; |
319 | return NSS_STATUS_UNAVAIL; | |
320 | } | |
20cc4c87 | 321 | if (size > len) |
5f0e6fc7 | 322 | { |
67479a70 | 323 | *errnop = EAFNOSUPPORT; |
5f0e6fc7 RM |
324 | *h_errnop = NETDB_INTERNAL; |
325 | return NSS_STATUS_UNAVAIL; | |
326 | } | |
327 | ||
ee778b56 UD |
328 | host_buffer.buf = orig_host_buffer = (querybuf *) alloca (1024); |
329 | ||
5f0e6fc7 RM |
330 | switch (af) |
331 | { | |
332 | case AF_INET: | |
333 | sprintf (qbuf, "%u.%u.%u.%u.in-addr.arpa", (uaddr[3] & 0xff), | |
334 | (uaddr[2] & 0xff), (uaddr[1] & 0xff), (uaddr[0] & 0xff)); | |
335 | break; | |
336 | case AF_INET6: | |
ee778b56 UD |
337 | /* Only lookup with the byte string format if the user wants it. */ |
338 | if (__builtin_expect (_res.options & RES_USEBSTRING, 0)) | |
339 | { | |
340 | qp = stpcpy (qbuf, "\\[x"); | |
341 | for (n = 0; n < IN6ADDRSZ; ++n) | |
342 | qp += sprintf (qp, "%02hhx", uaddr[n]); | |
343 | strcpy (qp, "].ip6.arpa"); | |
344 | n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, | |
345 | host_buffer.buf->buf, 1024, &host_buffer.ptr); | |
346 | if (n >= 0) | |
347 | goto got_it_already; | |
348 | } | |
5f0e6fc7 | 349 | qp = qbuf; |
ee778b56 UD |
350 | for (n = IN6ADDRSZ - 1; n >= 0; n--) |
351 | { | |
352 | static const char nibblechar[16] = "0123456789abcdef"; | |
353 | *qp++ = nibblechar[uaddr[n] & 0xf]; | |
354 | *qp++ = '.'; | |
355 | *qp++ = nibblechar[(uaddr[n] >> 4) & 0xf]; | |
356 | *qp++ = '.'; | |
357 | } | |
358 | strcpy(qp, "ip6.arpa"); | |
5f0e6fc7 RM |
359 | break; |
360 | default: | |
361 | /* Cannot happen. */ | |
9fea9ed6 | 362 | break; |
5f0e6fc7 RM |
363 | } |
364 | ||
16b66062 AJ |
365 | n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, host_buffer.buf->buf, |
366 | 1024, &host_buffer.ptr); | |
340ef046 | 367 | if (n < 0 && af == AF_INET6 && (_res.options & RES_NOIP6DOTINT) == 0) |
62a08e44 UD |
368 | { |
369 | strcpy (qp, "ip6.int"); | |
16b66062 AJ |
370 | n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, host_buffer.buf->buf, |
371 | host_buffer.buf != orig_host_buffer | |
372 | ? MAXPACKET : 1024, &host_buffer.ptr); | |
62a08e44 | 373 | } |
5f0e6fc7 | 374 | if (n < 0) |
dd7d45e8 UD |
375 | { |
376 | *h_errnop = h_errno; | |
34816665 | 377 | __set_errno (olderr); |
16b66062 AJ |
378 | if (host_buffer.buf != orig_host_buffer) |
379 | free (host_buffer.buf); | |
dd7d45e8 UD |
380 | return errno == ECONNREFUSED ? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND; |
381 | } | |
5f0e6fc7 | 382 | |
ee778b56 | 383 | got_it_already: |
16b66062 | 384 | status = getanswer_r (host_buffer.buf, n, qbuf, T_PTR, result, buffer, buflen, |
31e2791c | 385 | errnop, h_errnop, 0 /* XXX */, ttlp, NULL); |
16b66062 AJ |
386 | if (host_buffer.buf != orig_host_buffer) |
387 | free (host_buffer.buf); | |
5f0e6fc7 | 388 | if (status != NSS_STATUS_SUCCESS) |
65b4743a | 389 | return status; |
5f0e6fc7 RM |
390 | |
391 | #ifdef SUNSECURITY | |
392 | This is not implemented because it is not possible to use the current | |
393 | source from bind in a multi-threaded program. | |
394 | #endif | |
395 | ||
396 | result->h_addrtype = af; | |
397 | result->h_length = len; | |
63551311 | 398 | memcpy (host_data->host_addr, addr, len); |
5f0e6fc7 RM |
399 | host_data->h_addr_ptrs[0] = (char *) host_data->host_addr; |
400 | host_data->h_addr_ptrs[1] = NULL; | |
b455972f UD |
401 | #if 0 |
402 | /* XXX I think this is wrong. Why should an IPv4 address be | |
403 | converted to IPv6 if the user explicitly asked for IPv4? */ | |
5f0e6fc7 RM |
404 | if (af == AF_INET && (_res.options & RES_USE_INET6)) |
405 | { | |
406 | map_v4v6_address ((char *) host_data->host_addr, | |
407 | (char *) host_data->host_addr); | |
408 | result->h_addrtype = AF_INET6; | |
409 | result->h_length = IN6ADDRSZ; | |
410 | } | |
b455972f | 411 | #endif |
5f0e6fc7 RM |
412 | *h_errnop = NETDB_SUCCESS; |
413 | return NSS_STATUS_SUCCESS; | |
414 | } | |
31e2791c UD |
415 | hidden_def (_nss_dns_gethostbyaddr2_r) |
416 | ||
417 | ||
418 | enum nss_status | |
419 | _nss_dns_gethostbyaddr_r (const void *addr, socklen_t len, int af, | |
420 | struct hostent *result, char *buffer, size_t buflen, | |
421 | int *errnop, int *h_errnop) | |
422 | { | |
423 | return _nss_dns_gethostbyaddr2_r (addr, len, af, result, buffer, buflen, | |
424 | errnop, h_errnop, NULL); | |
425 | } | |
5f0e6fc7 | 426 | |
5db91571 UD |
427 | #ifdef RESOLVSORT |
428 | static void addrsort (char **ap, int num); | |
429 | ||
430 | static void | |
431 | addrsort (char **ap, int num) | |
432 | { | |
433 | int i, j; | |
434 | char **p; | |
435 | short aval[MAX_NR_ADDRS]; | |
436 | int needsort = 0; | |
437 | ||
438 | p = ap; | |
439 | if (num > MAX_NR_ADDRS) | |
440 | num = MAX_NR_ADDRS; | |
441 | for (i = 0; i < num; i++, p++) | |
442 | { | |
443 | for (j = 0 ; (unsigned)j < _res.nsort; j++) | |
444 | if (_res.sort_list[j].addr.s_addr == | |
445 | (((struct in_addr *)(*p))->s_addr & _res.sort_list[j].mask)) | |
446 | break; | |
447 | aval[i] = j; | |
448 | if (needsort == 0 && i > 0 && j < aval[i-1]) | |
449 | needsort = i; | |
450 | } | |
451 | if (!needsort) | |
452 | return; | |
453 | ||
454 | while (needsort++ < num) | |
455 | for (j = needsort - 2; j >= 0; j--) | |
456 | if (aval[j] > aval[j+1]) | |
457 | { | |
458 | char *hp; | |
459 | ||
460 | i = aval[j]; | |
461 | aval[j] = aval[j+1]; | |
462 | aval[j+1] = i; | |
463 | ||
464 | hp = ap[j]; | |
465 | ap[j] = ap[j+1]; | |
466 | ap[j+1] = hp; | |
467 | } | |
468 | else | |
469 | break; | |
470 | } | |
471 | #endif | |
5f0e6fc7 RM |
472 | |
473 | static enum nss_status | |
474 | getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, | |
df4ef2ab | 475 | struct hostent *result, char *buffer, size_t buflen, |
d1fe1f22 | 476 | int *errnop, int *h_errnop, int map, int32_t *ttlp, char **canonp) |
5f0e6fc7 RM |
477 | { |
478 | struct host_data | |
479 | { | |
480 | char *aliases[MAX_NR_ALIASES]; | |
481 | unsigned char host_addr[16]; /* IPv4 or IPv6 */ | |
88a96b81 | 482 | char *h_addr_ptrs[0]; |
2f1687b9 UD |
483 | } *host_data; |
484 | int linebuflen; | |
5f0e6fc7 RM |
485 | register const HEADER *hp; |
486 | const u_char *end_of_message, *cp; | |
487 | int n, ancount, qdcount; | |
488 | int haveanswer, had_error; | |
489 | char *bp, **ap, **hap; | |
845dcb57 | 490 | char tbuf[MAXDNAME]; |
5f0e6fc7 | 491 | const char *tname; |
b455972f | 492 | int (*name_ok) (const char *); |
8d8c6efa | 493 | u_char packtmp[NS_MAXCDNAME]; |
b455972f | 494 | int have_to_map = 0; |
d1fe1f22 | 495 | int32_t ttl = 0; |
2f1687b9 UD |
496 | uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct host_data); |
497 | buffer += pad; | |
498 | if (__builtin_expect (buflen < sizeof (struct host_data) + pad, 0)) | |
560d3b76 UD |
499 | { |
500 | /* The buffer is too small. */ | |
501 | too_small: | |
502 | *errnop = ERANGE; | |
503 | *h_errnop = NETDB_INTERNAL; | |
504 | return NSS_STATUS_TRYAGAIN; | |
505 | } | |
2f1687b9 UD |
506 | host_data = (struct host_data *) buffer; |
507 | linebuflen = buflen - sizeof (struct host_data); | |
508 | if (buflen - sizeof (struct host_data) != linebuflen) | |
509 | linebuflen = INT_MAX; | |
560d3b76 | 510 | |
5f0e6fc7 RM |
511 | tname = qname; |
512 | result->h_name = NULL; | |
513 | end_of_message = answer->buf + anslen; | |
514 | switch (qtype) | |
515 | { | |
516 | case T_A: | |
517 | case T_AAAA: | |
518 | name_ok = res_hnok; | |
519 | break; | |
520 | case T_PTR: | |
521 | name_ok = res_dnok; | |
522 | break; | |
523 | default: | |
a0bf6ac7 | 524 | *errnop = ENOENT; |
5f0e6fc7 RM |
525 | return NSS_STATUS_UNAVAIL; /* XXX should be abort(); */ |
526 | } | |
527 | ||
528 | /* | |
529 | * find first satisfactory answer | |
530 | */ | |
531 | hp = &answer->hdr; | |
5f0e6fc7 RM |
532 | ancount = ntohs (hp->ancount); |
533 | qdcount = ntohs (hp->qdcount); | |
534 | cp = answer->buf + HFIXEDSZ; | |
b455972f | 535 | if (__builtin_expect (qdcount, 1) != 1) |
5f0e6fc7 RM |
536 | { |
537 | *h_errnop = NO_RECOVERY; | |
538 | return NSS_STATUS_UNAVAIL; | |
539 | } | |
88a96b81 UD |
540 | if (sizeof (struct host_data) + (ancount + 1) * sizeof (char *) >= buflen) |
541 | goto too_small; | |
542 | bp = (char *) &host_data->h_addr_ptrs[ancount + 1]; | |
543 | linebuflen -= (ancount + 1) * sizeof (char *); | |
5f0e6fc7 | 544 | |
8d8c6efa UD |
545 | n = __ns_name_unpack (answer->buf, end_of_message, cp, |
546 | packtmp, sizeof packtmp); | |
547 | if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) | |
5f0e6fc7 | 548 | { |
b455972f | 549 | if (__builtin_expect (errno, 0) == EMSGSIZE) |
560d3b76 | 550 | goto too_small; |
8d8c6efa UD |
551 | |
552 | n = -1; | |
553 | } | |
554 | ||
555 | if (n > 0 && bp[0] == '.') | |
556 | bp[0] = '\0'; | |
557 | ||
558 | if (n < 0 || (*name_ok) (bp) == 0) | |
559 | { | |
560 | *errnop = errno; | |
561 | *h_errnop = NO_RECOVERY; | |
5f0e6fc7 RM |
562 | return NSS_STATUS_UNAVAIL; |
563 | } | |
564 | cp += n + QFIXEDSZ; | |
565 | ||
566 | if (qtype == T_A || qtype == T_AAAA) | |
567 | { | |
568 | /* res_send() has already verified that the query name is the | |
569 | * same as the one we sent; this just gets the expanded name | |
570 | * (i.e., with the succeeding search-domain tacked on). | |
571 | */ | |
572 | n = strlen (bp) + 1; /* for the \0 */ | |
76b87c03 UD |
573 | if (n >= MAXHOSTNAMELEN) |
574 | { | |
67479a70 | 575 | *h_errnop = NO_RECOVERY; |
a0bf6ac7 | 576 | *errnop = ENOENT; |
76b87c03 UD |
577 | return NSS_STATUS_TRYAGAIN; |
578 | } | |
5f0e6fc7 RM |
579 | result->h_name = bp; |
580 | bp += n; | |
581 | linebuflen -= n; | |
560d3b76 UD |
582 | if (linebuflen < 0) |
583 | goto too_small; | |
5f0e6fc7 RM |
584 | /* The qname can be abbreviated, but h_name is now absolute. */ |
585 | qname = result->h_name; | |
586 | } | |
587 | ||
588 | ap = host_data->aliases; | |
589 | *ap = NULL; | |
590 | result->h_aliases = host_data->aliases; | |
591 | hap = host_data->h_addr_ptrs; | |
592 | *hap = NULL; | |
593 | result->h_addr_list = host_data->h_addr_ptrs; | |
594 | haveanswer = 0; | |
595 | had_error = 0; | |
596 | ||
597 | while (ancount-- > 0 && cp < end_of_message && had_error == 0) | |
598 | { | |
599 | int type, class; | |
600 | ||
8d8c6efa UD |
601 | n = __ns_name_unpack (answer->buf, end_of_message, cp, |
602 | packtmp, sizeof packtmp); | |
603 | if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) | |
604 | { | |
b455972f | 605 | if (__builtin_expect (errno, 0) == EMSGSIZE) |
0cc70fcf | 606 | goto too_small; |
8d8c6efa UD |
607 | |
608 | n = -1; | |
609 | } | |
610 | ||
5f0e6fc7 RM |
611 | if (n < 0 || (*name_ok) (bp) == 0) |
612 | { | |
613 | ++had_error; | |
614 | continue; | |
615 | } | |
616 | cp += n; /* name */ | |
b43b13ac | 617 | type = ns_get16 (cp); |
5f0e6fc7 | 618 | cp += INT16SZ; /* type */ |
b43b13ac | 619 | class = ns_get16 (cp); |
d1fe1f22 UD |
620 | cp += INT16SZ; /* class */ |
621 | ttl = ns_get32 (cp); | |
622 | cp += INT32SZ; /* TTL */ | |
b43b13ac | 623 | n = ns_get16 (cp); |
5f0e6fc7 RM |
624 | cp += INT16SZ; /* len */ |
625 | if (class != C_IN) | |
626 | { | |
627 | /* XXX - debug? syslog? */ | |
628 | cp += n; | |
629 | continue; /* XXX - had_error++ ? */ | |
630 | } | |
631 | ||
632 | if ((qtype ==T_A || qtype == T_AAAA) && type == T_CNAME) | |
633 | { | |
634 | if (ap >= &host_data->aliases[MAX_NR_ALIASES - 1]) | |
635 | continue; | |
636 | n = dn_expand (answer->buf, end_of_message, cp, tbuf, sizeof tbuf); | |
637 | if (n < 0 || (*name_ok) (tbuf) == 0) | |
638 | { | |
639 | ++had_error; | |
640 | continue; | |
641 | } | |
642 | cp += n; | |
643 | /* Store alias. */ | |
644 | *ap++ = bp; | |
645 | n = strlen (bp) + 1; /* For the \0. */ | |
b455972f | 646 | if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN) |
76b87c03 UD |
647 | { |
648 | ++had_error; | |
649 | continue; | |
650 | } | |
5f0e6fc7 RM |
651 | bp += n; |
652 | linebuflen -= n; | |
653 | /* Get canonical name. */ | |
654 | n = strlen (tbuf) + 1; /* For the \0. */ | |
b455972f | 655 | if (__builtin_expect (n > linebuflen, 0)) |
0cc70fcf | 656 | goto too_small; |
b455972f | 657 | if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN) |
5f0e6fc7 RM |
658 | { |
659 | ++had_error; | |
660 | continue; | |
661 | } | |
8d8c6efa UD |
662 | result->h_name = bp; |
663 | bp = __mempcpy (bp, tbuf, n); /* Cannot overflow. */ | |
5f0e6fc7 RM |
664 | linebuflen -= n; |
665 | continue; | |
666 | } | |
667 | ||
668 | if (qtype == T_PTR && type == T_CNAME) | |
669 | { | |
670 | n = dn_expand (answer->buf, end_of_message, cp, tbuf, sizeof tbuf); | |
da2d1bc5 | 671 | if (n < 0 || res_dnok (tbuf) == 0) |
5f0e6fc7 RM |
672 | { |
673 | ++had_error; | |
674 | continue; | |
675 | } | |
676 | cp += n; | |
da2d1bc5 | 677 | /* Get canonical name. */ |
5f0e6fc7 | 678 | n = strlen (tbuf) + 1; /* For the \0. */ |
b455972f | 679 | if (__builtin_expect (n > linebuflen, 0)) |
0cc70fcf | 680 | goto too_small; |
b455972f | 681 | if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN) |
5f0e6fc7 RM |
682 | { |
683 | ++had_error; | |
684 | continue; | |
685 | } | |
8d8c6efa UD |
686 | tname = bp; |
687 | bp = __mempcpy (bp, tbuf, n); /* Cannot overflow. */ | |
5f0e6fc7 RM |
688 | linebuflen -= n; |
689 | continue; | |
690 | } | |
b455972f UD |
691 | if (__builtin_expect (type == T_SIG, 0) |
692 | || __builtin_expect (type == T_KEY, 0) | |
693 | || __builtin_expect (type == T_NXT, 0)) | |
1bc21e7a UD |
694 | { |
695 | /* We don't support DNSSEC yet. For now, ignore the record | |
696 | and send a low priority message to syslog. */ | |
697 | syslog (LOG_DEBUG | LOG_AUTH, | |
698 | "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"", | |
699 | qname, p_class (C_IN), p_type(qtype), p_type (type)); | |
700 | cp += n; | |
701 | continue; | |
702 | } | |
b455972f UD |
703 | |
704 | if (type == T_A && qtype == T_AAAA && map) | |
705 | have_to_map = 1; | |
706 | else if (__builtin_expect (type != qtype, 0)) | |
5f0e6fc7 RM |
707 | { |
708 | syslog (LOG_NOTICE | LOG_AUTH, | |
709 | "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"", | |
710 | qname, p_class (C_IN), p_type (qtype), p_type (type)); | |
711 | cp += n; | |
712 | continue; /* XXX - had_error++ ? */ | |
713 | } | |
714 | ||
715 | switch (type) | |
716 | { | |
717 | case T_PTR: | |
8d8c6efa | 718 | if (__strcasecmp (tname, bp) != 0) |
5f0e6fc7 RM |
719 | { |
720 | syslog (LOG_NOTICE | LOG_AUTH, AskedForGot, qname, bp); | |
721 | cp += n; | |
722 | continue; /* XXX - had_error++ ? */ | |
723 | } | |
8d8c6efa UD |
724 | |
725 | n = __ns_name_unpack (answer->buf, end_of_message, cp, | |
726 | packtmp, sizeof packtmp); | |
727 | if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) | |
728 | { | |
b455972f | 729 | if (__builtin_expect (errno, 0) == EMSGSIZE) |
0cc70fcf | 730 | goto too_small; |
8d8c6efa UD |
731 | |
732 | n = -1; | |
733 | } | |
734 | ||
5f0e6fc7 RM |
735 | if (n < 0 || res_hnok (bp) == 0) |
736 | { | |
737 | ++had_error; | |
738 | break; | |
739 | } | |
740 | #if MULTI_PTRS_ARE_ALIASES | |
741 | cp += n; | |
742 | if (haveanswer == 0) | |
743 | result->h_name = bp; | |
744 | else if (ap < &host_data->aliases[MAXALIASES-1]) | |
745 | *ap++ = bp; | |
746 | else | |
747 | n = -1; | |
748 | if (n != -1) | |
749 | { | |
750 | n = strlen (bp) + 1; /* for the \0 */ | |
b455972f | 751 | if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN) |
76b87c03 UD |
752 | { |
753 | ++had_error; | |
754 | break; | |
755 | } | |
5f0e6fc7 RM |
756 | bp += n; |
757 | linebuflen -= n; | |
758 | } | |
759 | break; | |
760 | #else | |
761 | result->h_name = bp; | |
b455972f | 762 | if (have_to_map) |
5f0e6fc7 RM |
763 | { |
764 | n = strlen (bp) + 1; /* for the \0 */ | |
76b87c03 UD |
765 | if (n >= MAXHOSTNAMELEN) |
766 | { | |
767 | ++had_error; | |
768 | break; | |
769 | } | |
5f0e6fc7 RM |
770 | bp += n; |
771 | linebuflen -= n; | |
772 | map_v4v6_hostent (result, &bp, &linebuflen); | |
773 | } | |
774 | *h_errnop = NETDB_SUCCESS; | |
775 | return NSS_STATUS_SUCCESS; | |
776 | #endif | |
777 | case T_A: | |
778 | case T_AAAA: | |
b455972f | 779 | if (__builtin_expect (strcasecmp (result->h_name, bp), 0) != 0) |
5f0e6fc7 RM |
780 | { |
781 | syslog (LOG_NOTICE | LOG_AUTH, AskedForGot, result->h_name, bp); | |
782 | cp += n; | |
783 | continue; /* XXX - had_error++ ? */ | |
784 | } | |
1f64ac13 | 785 | if (n != result->h_length) |
5f0e6fc7 | 786 | { |
1f64ac13 UD |
787 | cp += n; |
788 | continue; | |
5f0e6fc7 | 789 | } |
1f64ac13 | 790 | if (!haveanswer) |
5f0e6fc7 RM |
791 | { |
792 | register int nn; | |
793 | ||
d1fe1f22 UD |
794 | if (ttlp != NULL && ttl != 0) |
795 | *ttlp = ttl; | |
796 | if (canonp != NULL) | |
797 | *canonp = bp; | |
5f0e6fc7 RM |
798 | result->h_name = bp; |
799 | nn = strlen (bp) + 1; /* for the \0 */ | |
800 | bp += nn; | |
801 | linebuflen -= nn; | |
802 | } | |
803 | ||
560d3b76 | 804 | linebuflen -= sizeof (align) - ((u_long) bp % sizeof (align)); |
5f0e6fc7 RM |
805 | bp += sizeof (align) - ((u_long) bp % sizeof (align)); |
806 | ||
b455972f | 807 | if (__builtin_expect (n > linebuflen, 0)) |
0cc70fcf | 808 | goto too_small; |
8d8c6efa | 809 | bp = __mempcpy (*hap++ = bp, cp, n); |
5f0e6fc7 RM |
810 | cp += n; |
811 | linebuflen -= n; | |
812 | break; | |
813 | default: | |
814 | abort (); | |
815 | } | |
816 | if (had_error == 0) | |
817 | ++haveanswer; | |
818 | } | |
819 | ||
820 | if (haveanswer > 0) | |
821 | { | |
822 | *ap = NULL; | |
823 | *hap = NULL; | |
da2d1bc5 | 824 | #if defined RESOLVSORT |
5f0e6fc7 RM |
825 | /* |
826 | * Note: we sort even if host can take only one address | |
827 | * in its return structures - should give it the "best" | |
828 | * address in that case, not some random one | |
829 | */ | |
830 | if (_res.nsort && haveanswer > 1 && qtype == T_A) | |
831 | addrsort (host_data->h_addr_ptrs, haveanswer); | |
832 | #endif /*RESOLVSORT*/ | |
833 | ||
834 | if (result->h_name == NULL) | |
835 | { | |
836 | n = strlen (qname) + 1; /* For the \0. */ | |
8d8c6efa | 837 | if (n > linebuflen) |
0cc70fcf | 838 | goto too_small; |
8d8c6efa | 839 | if (n >= MAXHOSTNAMELEN) |
76b87c03 | 840 | goto no_recovery; |
8d8c6efa UD |
841 | result->h_name = bp; |
842 | bp = __mempcpy (bp, qname, n); /* Cannot overflow. */ | |
5f0e6fc7 RM |
843 | linebuflen -= n; |
844 | } | |
845 | ||
b455972f | 846 | if (have_to_map) |
5f0e6fc7 RM |
847 | map_v4v6_hostent (result, &bp, &linebuflen); |
848 | *h_errnop = NETDB_SUCCESS; | |
849 | return NSS_STATUS_SUCCESS; | |
850 | } | |
76b87c03 UD |
851 | no_recovery: |
852 | *h_errnop = NO_RECOVERY; | |
a0bf6ac7 | 853 | *errnop = ENOENT; |
2884dad4 UD |
854 | /* Special case here: if the resolver sent a result but it only |
855 | contains a CNAME while we are looking for a T_A or T_AAAA record, | |
856 | we fail with NOTFOUND instead of TRYAGAIN. */ | |
857 | return ((qtype == T_A || qtype == T_AAAA) && ap != host_data->aliases | |
858 | ? NSS_STATUS_NOTFOUND : NSS_STATUS_TRYAGAIN); | |
5f0e6fc7 | 859 | } |