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Commit | Line | Data |
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ee778b56 | 1 | /* Copyright (C) 1996-2003, 2004 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 UD |
127 | size_t buflen, int *errnop, int *h_errnop, |
128 | int map); | |
5f0e6fc7 RM |
129 | |
130 | enum nss_status | |
131 | _nss_dns_gethostbyname2_r (const char *name, int af, struct hostent *result, | |
67479a70 UD |
132 | char *buffer, size_t buflen, int *errnop, |
133 | int *h_errnop) | |
5f0e6fc7 | 134 | { |
16b66062 AJ |
135 | union |
136 | { | |
137 | querybuf *buf; | |
138 | u_char *ptr; | |
139 | } host_buffer; | |
140 | querybuf *orig_host_buffer; | |
f80f1a4a | 141 | char tmp[NS_MAXDNAME]; |
5f0e6fc7 RM |
142 | int size, type, n; |
143 | const char *cp; | |
0420d888 | 144 | int map = 0; |
34816665 | 145 | int olderr = errno; |
6166815d | 146 | enum nss_status status; |
5f0e6fc7 | 147 | |
b43b13ac UD |
148 | if ((_res.options & RES_INIT) == 0 && __res_ninit (&_res) == -1) |
149 | return NSS_STATUS_UNAVAIL; | |
150 | ||
5f0e6fc7 RM |
151 | switch (af) { |
152 | case AF_INET: | |
153 | size = INADDRSZ; | |
154 | type = T_A; | |
155 | break; | |
156 | case AF_INET6: | |
157 | size = IN6ADDRSZ; | |
158 | type = T_AAAA; | |
159 | break; | |
160 | default: | |
0cc70fcf | 161 | *h_errnop = NO_DATA; |
67479a70 | 162 | *errnop = EAFNOSUPPORT; |
5f0e6fc7 RM |
163 | return NSS_STATUS_UNAVAIL; |
164 | } | |
165 | ||
166 | result->h_addrtype = af; | |
167 | result->h_length = size; | |
168 | ||
169 | /* | |
170 | * if there aren't any dots, it could be a user-level alias. | |
171 | * this is also done in res_query() since we are not the only | |
172 | * function that looks up host names. | |
173 | */ | |
f80f1a4a UD |
174 | if (strchr (name, '.') == NULL |
175 | && (cp = res_hostalias (&_res, name, tmp, sizeof (tmp))) != NULL) | |
5f0e6fc7 RM |
176 | name = cp; |
177 | ||
16b66062 | 178 | host_buffer.buf = orig_host_buffer = (querybuf *) alloca (1024); |
6166815d | 179 | |
16b66062 AJ |
180 | n = __libc_res_nsearch (&_res, name, C_IN, type, host_buffer.buf->buf, |
181 | 1024, &host_buffer.ptr); | |
5f0e6fc7 | 182 | if (n < 0) |
dd7d45e8 | 183 | { |
b455972f UD |
184 | enum nss_status status = (errno == ECONNREFUSED |
185 | ? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND); | |
dd7d45e8 | 186 | *h_errnop = h_errno; |
34816665 UD |
187 | if (h_errno == TRY_AGAIN) |
188 | *errnop = EAGAIN; | |
189 | else | |
190 | __set_errno (olderr); | |
b455972f UD |
191 | |
192 | /* If we are looking for a IPv6 address and mapping is enabled | |
193 | by having the RES_USE_INET6 bit in _res.options set, we try | |
194 | another lookup. */ | |
195 | if (af == AF_INET6 && (_res.options & RES_USE_INET6)) | |
16b66062 AJ |
196 | n = __libc_res_nsearch (&_res, name, C_IN, T_A, host_buffer.buf->buf, |
197 | host_buffer.buf != orig_host_buffer | |
198 | ? MAXPACKET : 1024, &host_buffer.ptr); | |
b455972f UD |
199 | |
200 | if (n < 0) | |
6166815d | 201 | { |
16b66062 AJ |
202 | if (host_buffer.buf != orig_host_buffer) |
203 | free (host_buffer.buf); | |
6166815d UD |
204 | return status; |
205 | } | |
b455972f UD |
206 | |
207 | map = 1; | |
208 | ||
209 | result->h_addrtype = AF_INET; | |
210 | result->h_length = INADDRSZ;; | |
dd7d45e8 | 211 | } |
5f0e6fc7 | 212 | |
16b66062 | 213 | status = getanswer_r (host_buffer.buf, n, name, type, result, buffer, buflen, |
6166815d | 214 | errnop, h_errnop, map); |
16b66062 AJ |
215 | if (host_buffer.buf != orig_host_buffer) |
216 | free (host_buffer.buf); | |
6166815d | 217 | return status; |
5f0e6fc7 RM |
218 | } |
219 | ||
220 | ||
221 | enum nss_status | |
222 | _nss_dns_gethostbyname_r (const char *name, struct hostent *result, | |
67479a70 UD |
223 | char *buffer, size_t buflen, int *errnop, |
224 | int *h_errnop) | |
5f0e6fc7 RM |
225 | { |
226 | enum nss_status status = NSS_STATUS_NOTFOUND; | |
227 | ||
228 | if (_res.options & RES_USE_INET6) | |
229 | status = _nss_dns_gethostbyname2_r (name, AF_INET6, result, buffer, | |
67479a70 | 230 | buflen, errnop, h_errnop); |
5f0e6fc7 RM |
231 | if (status == NSS_STATUS_NOTFOUND) |
232 | status = _nss_dns_gethostbyname2_r (name, AF_INET, result, buffer, | |
67479a70 | 233 | buflen, errnop, h_errnop); |
5f0e6fc7 RM |
234 | |
235 | return status; | |
236 | } | |
237 | ||
238 | ||
239 | enum nss_status | |
51eecc4a | 240 | _nss_dns_gethostbyaddr_r (const void *addr, socklen_t len, int af, |
df4ef2ab | 241 | struct hostent *result, char *buffer, size_t buflen, |
67479a70 | 242 | int *errnop, int *h_errnop) |
5f0e6fc7 RM |
243 | { |
244 | static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff }; | |
245 | static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 }; | |
20cc4c87 | 246 | static const u_char v6local[] = { 0,0, 0,1 }; |
5f0e6fc7 RM |
247 | const u_char *uaddr = (const u_char *)addr; |
248 | struct host_data | |
249 | { | |
250 | char *aliases[MAX_NR_ALIASES]; | |
251 | unsigned char host_addr[16]; /* IPv4 or IPv6 */ | |
252 | char *h_addr_ptrs[MAX_NR_ADDRS + 1]; | |
253 | char linebuffer[0]; | |
254 | } *host_data = (struct host_data *) buffer; | |
16b66062 AJ |
255 | union |
256 | { | |
257 | querybuf *buf; | |
258 | u_char *ptr; | |
259 | } host_buffer; | |
260 | querybuf *orig_host_buffer; | |
1f3f143e | 261 | char qbuf[MAXDNAME+1], *qp = NULL; |
30f22ab1 | 262 | size_t size; |
0420d888 | 263 | int n, status; |
34816665 | 264 | int olderr = errno; |
5f0e6fc7 | 265 | |
b43b13ac UD |
266 | if ((_res.options & RES_INIT) == 0 && __res_ninit (&_res) == -1) |
267 | return NSS_STATUS_UNAVAIL; | |
268 | ||
20cc4c87 UD |
269 | if (af == AF_INET6 && len == IN6ADDRSZ |
270 | && (memcmp (uaddr, mapped, sizeof mapped) == 0 | |
271 | || (memcmp (uaddr, tunnelled, sizeof tunnelled) == 0 | |
272 | && memcmp (&uaddr[sizeof tunnelled], v6local, sizeof v6local)))) | |
5f0e6fc7 RM |
273 | { |
274 | /* Unmap. */ | |
275 | addr += sizeof mapped; | |
276 | uaddr += sizeof mapped; | |
277 | af = AF_INET; | |
278 | len = INADDRSZ; | |
279 | } | |
280 | ||
281 | switch (af) | |
282 | { | |
283 | case AF_INET: | |
284 | size = INADDRSZ; | |
285 | break; | |
286 | case AF_INET6: | |
287 | size = IN6ADDRSZ; | |
288 | break; | |
289 | default: | |
67479a70 | 290 | *errnop = EAFNOSUPPORT; |
5f0e6fc7 RM |
291 | *h_errnop = NETDB_INTERNAL; |
292 | return NSS_STATUS_UNAVAIL; | |
293 | } | |
20cc4c87 | 294 | if (size > len) |
5f0e6fc7 | 295 | { |
67479a70 | 296 | *errnop = EAFNOSUPPORT; |
5f0e6fc7 RM |
297 | *h_errnop = NETDB_INTERNAL; |
298 | return NSS_STATUS_UNAVAIL; | |
299 | } | |
300 | ||
ee778b56 UD |
301 | host_buffer.buf = orig_host_buffer = (querybuf *) alloca (1024); |
302 | ||
5f0e6fc7 RM |
303 | switch (af) |
304 | { | |
305 | case AF_INET: | |
306 | sprintf (qbuf, "%u.%u.%u.%u.in-addr.arpa", (uaddr[3] & 0xff), | |
307 | (uaddr[2] & 0xff), (uaddr[1] & 0xff), (uaddr[0] & 0xff)); | |
308 | break; | |
309 | case AF_INET6: | |
ee778b56 UD |
310 | /* Only lookup with the byte string format if the user wants it. */ |
311 | if (__builtin_expect (_res.options & RES_USEBSTRING, 0)) | |
312 | { | |
313 | qp = stpcpy (qbuf, "\\[x"); | |
314 | for (n = 0; n < IN6ADDRSZ; ++n) | |
315 | qp += sprintf (qp, "%02hhx", uaddr[n]); | |
316 | strcpy (qp, "].ip6.arpa"); | |
317 | n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, | |
318 | host_buffer.buf->buf, 1024, &host_buffer.ptr); | |
319 | if (n >= 0) | |
320 | goto got_it_already; | |
321 | } | |
5f0e6fc7 | 322 | qp = qbuf; |
ee778b56 UD |
323 | for (n = IN6ADDRSZ - 1; n >= 0; n--) |
324 | { | |
325 | static const char nibblechar[16] = "0123456789abcdef"; | |
326 | *qp++ = nibblechar[uaddr[n] & 0xf]; | |
327 | *qp++ = '.'; | |
328 | *qp++ = nibblechar[(uaddr[n] >> 4) & 0xf]; | |
329 | *qp++ = '.'; | |
330 | } | |
331 | strcpy(qp, "ip6.arpa"); | |
5f0e6fc7 RM |
332 | break; |
333 | default: | |
334 | /* Cannot happen. */ | |
9fea9ed6 | 335 | break; |
5f0e6fc7 RM |
336 | } |
337 | ||
16b66062 AJ |
338 | n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, host_buffer.buf->buf, |
339 | 1024, &host_buffer.ptr); | |
340ef046 | 340 | if (n < 0 && af == AF_INET6 && (_res.options & RES_NOIP6DOTINT) == 0) |
62a08e44 UD |
341 | { |
342 | strcpy (qp, "ip6.int"); | |
16b66062 AJ |
343 | n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, host_buffer.buf->buf, |
344 | host_buffer.buf != orig_host_buffer | |
345 | ? MAXPACKET : 1024, &host_buffer.ptr); | |
62a08e44 | 346 | } |
5f0e6fc7 | 347 | if (n < 0) |
dd7d45e8 UD |
348 | { |
349 | *h_errnop = h_errno; | |
34816665 | 350 | __set_errno (olderr); |
16b66062 AJ |
351 | if (host_buffer.buf != orig_host_buffer) |
352 | free (host_buffer.buf); | |
dd7d45e8 UD |
353 | return errno == ECONNREFUSED ? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND; |
354 | } | |
5f0e6fc7 | 355 | |
ee778b56 | 356 | got_it_already: |
16b66062 | 357 | status = getanswer_r (host_buffer.buf, n, qbuf, T_PTR, result, buffer, buflen, |
b455972f | 358 | errnop, h_errnop, 0 /* XXX */); |
16b66062 AJ |
359 | if (host_buffer.buf != orig_host_buffer) |
360 | free (host_buffer.buf); | |
5f0e6fc7 | 361 | if (status != NSS_STATUS_SUCCESS) |
dd7d45e8 UD |
362 | { |
363 | *h_errnop = h_errno; | |
67479a70 | 364 | *errnop = errno; |
dd7d45e8 UD |
365 | return status; |
366 | } | |
5f0e6fc7 RM |
367 | |
368 | #ifdef SUNSECURITY | |
369 | This is not implemented because it is not possible to use the current | |
370 | source from bind in a multi-threaded program. | |
371 | #endif | |
372 | ||
373 | result->h_addrtype = af; | |
374 | result->h_length = len; | |
63551311 | 375 | memcpy (host_data->host_addr, addr, len); |
5f0e6fc7 RM |
376 | host_data->h_addr_ptrs[0] = (char *) host_data->host_addr; |
377 | host_data->h_addr_ptrs[1] = NULL; | |
b455972f UD |
378 | #if 0 |
379 | /* XXX I think this is wrong. Why should an IPv4 address be | |
380 | converted to IPv6 if the user explicitly asked for IPv4? */ | |
5f0e6fc7 RM |
381 | if (af == AF_INET && (_res.options & RES_USE_INET6)) |
382 | { | |
383 | map_v4v6_address ((char *) host_data->host_addr, | |
384 | (char *) host_data->host_addr); | |
385 | result->h_addrtype = AF_INET6; | |
386 | result->h_length = IN6ADDRSZ; | |
387 | } | |
b455972f | 388 | #endif |
5f0e6fc7 RM |
389 | *h_errnop = NETDB_SUCCESS; |
390 | return NSS_STATUS_SUCCESS; | |
391 | } | |
392 | ||
5db91571 UD |
393 | #ifdef RESOLVSORT |
394 | static void addrsort (char **ap, int num); | |
395 | ||
396 | static void | |
397 | addrsort (char **ap, int num) | |
398 | { | |
399 | int i, j; | |
400 | char **p; | |
401 | short aval[MAX_NR_ADDRS]; | |
402 | int needsort = 0; | |
403 | ||
404 | p = ap; | |
405 | if (num > MAX_NR_ADDRS) | |
406 | num = MAX_NR_ADDRS; | |
407 | for (i = 0; i < num; i++, p++) | |
408 | { | |
409 | for (j = 0 ; (unsigned)j < _res.nsort; j++) | |
410 | if (_res.sort_list[j].addr.s_addr == | |
411 | (((struct in_addr *)(*p))->s_addr & _res.sort_list[j].mask)) | |
412 | break; | |
413 | aval[i] = j; | |
414 | if (needsort == 0 && i > 0 && j < aval[i-1]) | |
415 | needsort = i; | |
416 | } | |
417 | if (!needsort) | |
418 | return; | |
419 | ||
420 | while (needsort++ < num) | |
421 | for (j = needsort - 2; j >= 0; j--) | |
422 | if (aval[j] > aval[j+1]) | |
423 | { | |
424 | char *hp; | |
425 | ||
426 | i = aval[j]; | |
427 | aval[j] = aval[j+1]; | |
428 | aval[j+1] = i; | |
429 | ||
430 | hp = ap[j]; | |
431 | ap[j] = ap[j+1]; | |
432 | ap[j+1] = hp; | |
433 | } | |
434 | else | |
435 | break; | |
436 | } | |
437 | #endif | |
5f0e6fc7 RM |
438 | |
439 | static enum nss_status | |
440 | getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, | |
df4ef2ab | 441 | struct hostent *result, char *buffer, size_t buflen, |
b455972f | 442 | int *errnop, int *h_errnop, int map) |
5f0e6fc7 RM |
443 | { |
444 | struct host_data | |
445 | { | |
446 | char *aliases[MAX_NR_ALIASES]; | |
447 | unsigned char host_addr[16]; /* IPv4 or IPv6 */ | |
88a96b81 | 448 | char *h_addr_ptrs[0]; |
5f0e6fc7 | 449 | } *host_data = (struct host_data *) buffer; |
88a96b81 | 450 | int linebuflen = buflen - sizeof (struct host_data); |
5f0e6fc7 RM |
451 | register const HEADER *hp; |
452 | const u_char *end_of_message, *cp; | |
453 | int n, ancount, qdcount; | |
454 | int haveanswer, had_error; | |
455 | char *bp, **ap, **hap; | |
845dcb57 | 456 | char tbuf[MAXDNAME]; |
5f0e6fc7 | 457 | const char *tname; |
b455972f | 458 | int (*name_ok) (const char *); |
8d8c6efa | 459 | u_char packtmp[NS_MAXCDNAME]; |
b455972f | 460 | int have_to_map = 0; |
5f0e6fc7 | 461 | |
b455972f | 462 | if (__builtin_expect (linebuflen, 0) < 0) |
560d3b76 UD |
463 | { |
464 | /* The buffer is too small. */ | |
465 | too_small: | |
466 | *errnop = ERANGE; | |
467 | *h_errnop = NETDB_INTERNAL; | |
468 | return NSS_STATUS_TRYAGAIN; | |
469 | } | |
470 | ||
5f0e6fc7 RM |
471 | tname = qname; |
472 | result->h_name = NULL; | |
473 | end_of_message = answer->buf + anslen; | |
474 | switch (qtype) | |
475 | { | |
476 | case T_A: | |
477 | case T_AAAA: | |
478 | name_ok = res_hnok; | |
479 | break; | |
480 | case T_PTR: | |
481 | name_ok = res_dnok; | |
482 | break; | |
483 | default: | |
a0bf6ac7 | 484 | *errnop = ENOENT; |
5f0e6fc7 RM |
485 | return NSS_STATUS_UNAVAIL; /* XXX should be abort(); */ |
486 | } | |
487 | ||
488 | /* | |
489 | * find first satisfactory answer | |
490 | */ | |
491 | hp = &answer->hdr; | |
5f0e6fc7 RM |
492 | ancount = ntohs (hp->ancount); |
493 | qdcount = ntohs (hp->qdcount); | |
494 | cp = answer->buf + HFIXEDSZ; | |
b455972f | 495 | if (__builtin_expect (qdcount, 1) != 1) |
5f0e6fc7 RM |
496 | { |
497 | *h_errnop = NO_RECOVERY; | |
498 | return NSS_STATUS_UNAVAIL; | |
499 | } | |
88a96b81 UD |
500 | if (sizeof (struct host_data) + (ancount + 1) * sizeof (char *) >= buflen) |
501 | goto too_small; | |
502 | bp = (char *) &host_data->h_addr_ptrs[ancount + 1]; | |
503 | linebuflen -= (ancount + 1) * sizeof (char *); | |
5f0e6fc7 | 504 | |
8d8c6efa UD |
505 | n = __ns_name_unpack (answer->buf, end_of_message, cp, |
506 | packtmp, sizeof packtmp); | |
507 | if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) | |
5f0e6fc7 | 508 | { |
b455972f | 509 | if (__builtin_expect (errno, 0) == EMSGSIZE) |
560d3b76 | 510 | goto too_small; |
8d8c6efa UD |
511 | |
512 | n = -1; | |
513 | } | |
514 | ||
515 | if (n > 0 && bp[0] == '.') | |
516 | bp[0] = '\0'; | |
517 | ||
518 | if (n < 0 || (*name_ok) (bp) == 0) | |
519 | { | |
520 | *errnop = errno; | |
521 | *h_errnop = NO_RECOVERY; | |
5f0e6fc7 RM |
522 | return NSS_STATUS_UNAVAIL; |
523 | } | |
524 | cp += n + QFIXEDSZ; | |
525 | ||
526 | if (qtype == T_A || qtype == T_AAAA) | |
527 | { | |
528 | /* res_send() has already verified that the query name is the | |
529 | * same as the one we sent; this just gets the expanded name | |
530 | * (i.e., with the succeeding search-domain tacked on). | |
531 | */ | |
532 | n = strlen (bp) + 1; /* for the \0 */ | |
76b87c03 UD |
533 | if (n >= MAXHOSTNAMELEN) |
534 | { | |
67479a70 | 535 | *h_errnop = NO_RECOVERY; |
a0bf6ac7 | 536 | *errnop = ENOENT; |
76b87c03 UD |
537 | return NSS_STATUS_TRYAGAIN; |
538 | } | |
5f0e6fc7 RM |
539 | result->h_name = bp; |
540 | bp += n; | |
541 | linebuflen -= n; | |
560d3b76 UD |
542 | if (linebuflen < 0) |
543 | goto too_small; | |
5f0e6fc7 RM |
544 | /* The qname can be abbreviated, but h_name is now absolute. */ |
545 | qname = result->h_name; | |
546 | } | |
547 | ||
548 | ap = host_data->aliases; | |
549 | *ap = NULL; | |
550 | result->h_aliases = host_data->aliases; | |
551 | hap = host_data->h_addr_ptrs; | |
552 | *hap = NULL; | |
553 | result->h_addr_list = host_data->h_addr_ptrs; | |
554 | haveanswer = 0; | |
555 | had_error = 0; | |
556 | ||
557 | while (ancount-- > 0 && cp < end_of_message && had_error == 0) | |
558 | { | |
559 | int type, class; | |
560 | ||
8d8c6efa UD |
561 | n = __ns_name_unpack (answer->buf, end_of_message, cp, |
562 | packtmp, sizeof packtmp); | |
563 | if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) | |
564 | { | |
b455972f | 565 | if (__builtin_expect (errno, 0) == EMSGSIZE) |
0cc70fcf | 566 | goto too_small; |
8d8c6efa UD |
567 | |
568 | n = -1; | |
569 | } | |
570 | ||
5f0e6fc7 RM |
571 | if (n < 0 || (*name_ok) (bp) == 0) |
572 | { | |
573 | ++had_error; | |
574 | continue; | |
575 | } | |
576 | cp += n; /* name */ | |
b43b13ac | 577 | type = ns_get16 (cp); |
5f0e6fc7 | 578 | cp += INT16SZ; /* type */ |
b43b13ac | 579 | class = ns_get16 (cp); |
5f0e6fc7 | 580 | cp += INT16SZ + INT32SZ; /* class, TTL */ |
b43b13ac | 581 | n = ns_get16 (cp); |
5f0e6fc7 RM |
582 | cp += INT16SZ; /* len */ |
583 | if (class != C_IN) | |
584 | { | |
585 | /* XXX - debug? syslog? */ | |
586 | cp += n; | |
587 | continue; /* XXX - had_error++ ? */ | |
588 | } | |
589 | ||
590 | if ((qtype ==T_A || qtype == T_AAAA) && type == T_CNAME) | |
591 | { | |
592 | if (ap >= &host_data->aliases[MAX_NR_ALIASES - 1]) | |
593 | continue; | |
594 | n = dn_expand (answer->buf, end_of_message, cp, tbuf, sizeof tbuf); | |
595 | if (n < 0 || (*name_ok) (tbuf) == 0) | |
596 | { | |
597 | ++had_error; | |
598 | continue; | |
599 | } | |
600 | cp += n; | |
601 | /* Store alias. */ | |
602 | *ap++ = bp; | |
603 | n = strlen (bp) + 1; /* For the \0. */ | |
b455972f | 604 | if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN) |
76b87c03 UD |
605 | { |
606 | ++had_error; | |
607 | continue; | |
608 | } | |
5f0e6fc7 RM |
609 | bp += n; |
610 | linebuflen -= n; | |
611 | /* Get canonical name. */ | |
612 | n = strlen (tbuf) + 1; /* For the \0. */ | |
b455972f | 613 | if (__builtin_expect (n > linebuflen, 0)) |
0cc70fcf | 614 | goto too_small; |
b455972f | 615 | if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN) |
5f0e6fc7 RM |
616 | { |
617 | ++had_error; | |
618 | continue; | |
619 | } | |
8d8c6efa UD |
620 | result->h_name = bp; |
621 | bp = __mempcpy (bp, tbuf, n); /* Cannot overflow. */ | |
5f0e6fc7 RM |
622 | linebuflen -= n; |
623 | continue; | |
624 | } | |
625 | ||
626 | if (qtype == T_PTR && type == T_CNAME) | |
627 | { | |
628 | n = dn_expand (answer->buf, end_of_message, cp, tbuf, sizeof tbuf); | |
da2d1bc5 | 629 | if (n < 0 || res_dnok (tbuf) == 0) |
5f0e6fc7 RM |
630 | { |
631 | ++had_error; | |
632 | continue; | |
633 | } | |
634 | cp += n; | |
da2d1bc5 | 635 | /* Get canonical name. */ |
5f0e6fc7 | 636 | n = strlen (tbuf) + 1; /* For the \0. */ |
b455972f | 637 | if (__builtin_expect (n > linebuflen, 0)) |
0cc70fcf | 638 | goto too_small; |
b455972f | 639 | if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN) |
5f0e6fc7 RM |
640 | { |
641 | ++had_error; | |
642 | continue; | |
643 | } | |
8d8c6efa UD |
644 | tname = bp; |
645 | bp = __mempcpy (bp, tbuf, n); /* Cannot overflow. */ | |
5f0e6fc7 RM |
646 | linebuflen -= n; |
647 | continue; | |
648 | } | |
b455972f UD |
649 | if (__builtin_expect (type == T_SIG, 0) |
650 | || __builtin_expect (type == T_KEY, 0) | |
651 | || __builtin_expect (type == T_NXT, 0)) | |
1bc21e7a UD |
652 | { |
653 | /* We don't support DNSSEC yet. For now, ignore the record | |
654 | and send a low priority message to syslog. */ | |
655 | syslog (LOG_DEBUG | LOG_AUTH, | |
656 | "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"", | |
657 | qname, p_class (C_IN), p_type(qtype), p_type (type)); | |
658 | cp += n; | |
659 | continue; | |
660 | } | |
b455972f UD |
661 | |
662 | if (type == T_A && qtype == T_AAAA && map) | |
663 | have_to_map = 1; | |
664 | else if (__builtin_expect (type != qtype, 0)) | |
5f0e6fc7 RM |
665 | { |
666 | syslog (LOG_NOTICE | LOG_AUTH, | |
667 | "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"", | |
668 | qname, p_class (C_IN), p_type (qtype), p_type (type)); | |
669 | cp += n; | |
670 | continue; /* XXX - had_error++ ? */ | |
671 | } | |
672 | ||
673 | switch (type) | |
674 | { | |
675 | case T_PTR: | |
8d8c6efa | 676 | if (__strcasecmp (tname, bp) != 0) |
5f0e6fc7 RM |
677 | { |
678 | syslog (LOG_NOTICE | LOG_AUTH, AskedForGot, qname, bp); | |
679 | cp += n; | |
680 | continue; /* XXX - had_error++ ? */ | |
681 | } | |
8d8c6efa UD |
682 | |
683 | n = __ns_name_unpack (answer->buf, end_of_message, cp, | |
684 | packtmp, sizeof packtmp); | |
685 | if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) | |
686 | { | |
b455972f | 687 | if (__builtin_expect (errno, 0) == EMSGSIZE) |
0cc70fcf | 688 | goto too_small; |
8d8c6efa UD |
689 | |
690 | n = -1; | |
691 | } | |
692 | ||
5f0e6fc7 RM |
693 | if (n < 0 || res_hnok (bp) == 0) |
694 | { | |
695 | ++had_error; | |
696 | break; | |
697 | } | |
698 | #if MULTI_PTRS_ARE_ALIASES | |
699 | cp += n; | |
700 | if (haveanswer == 0) | |
701 | result->h_name = bp; | |
702 | else if (ap < &host_data->aliases[MAXALIASES-1]) | |
703 | *ap++ = bp; | |
704 | else | |
705 | n = -1; | |
706 | if (n != -1) | |
707 | { | |
708 | n = strlen (bp) + 1; /* for the \0 */ | |
b455972f | 709 | if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN) |
76b87c03 UD |
710 | { |
711 | ++had_error; | |
712 | break; | |
713 | } | |
5f0e6fc7 RM |
714 | bp += n; |
715 | linebuflen -= n; | |
716 | } | |
717 | break; | |
718 | #else | |
719 | result->h_name = bp; | |
b455972f | 720 | if (have_to_map) |
5f0e6fc7 RM |
721 | { |
722 | n = strlen (bp) + 1; /* for the \0 */ | |
76b87c03 UD |
723 | if (n >= MAXHOSTNAMELEN) |
724 | { | |
725 | ++had_error; | |
726 | break; | |
727 | } | |
5f0e6fc7 RM |
728 | bp += n; |
729 | linebuflen -= n; | |
730 | map_v4v6_hostent (result, &bp, &linebuflen); | |
731 | } | |
732 | *h_errnop = NETDB_SUCCESS; | |
733 | return NSS_STATUS_SUCCESS; | |
734 | #endif | |
735 | case T_A: | |
736 | case T_AAAA: | |
b455972f | 737 | if (__builtin_expect (strcasecmp (result->h_name, bp), 0) != 0) |
5f0e6fc7 RM |
738 | { |
739 | syslog (LOG_NOTICE | LOG_AUTH, AskedForGot, result->h_name, bp); | |
740 | cp += n; | |
741 | continue; /* XXX - had_error++ ? */ | |
742 | } | |
1f64ac13 | 743 | if (n != result->h_length) |
5f0e6fc7 | 744 | { |
1f64ac13 UD |
745 | cp += n; |
746 | continue; | |
5f0e6fc7 | 747 | } |
1f64ac13 | 748 | if (!haveanswer) |
5f0e6fc7 RM |
749 | { |
750 | register int nn; | |
751 | ||
752 | result->h_name = bp; | |
753 | nn = strlen (bp) + 1; /* for the \0 */ | |
754 | bp += nn; | |
755 | linebuflen -= nn; | |
756 | } | |
757 | ||
560d3b76 | 758 | linebuflen -= sizeof (align) - ((u_long) bp % sizeof (align)); |
5f0e6fc7 RM |
759 | bp += sizeof (align) - ((u_long) bp % sizeof (align)); |
760 | ||
b455972f | 761 | if (__builtin_expect (n > linebuflen, 0)) |
0cc70fcf | 762 | goto too_small; |
8d8c6efa | 763 | bp = __mempcpy (*hap++ = bp, cp, n); |
5f0e6fc7 RM |
764 | cp += n; |
765 | linebuflen -= n; | |
766 | break; | |
767 | default: | |
768 | abort (); | |
769 | } | |
770 | if (had_error == 0) | |
771 | ++haveanswer; | |
772 | } | |
773 | ||
774 | if (haveanswer > 0) | |
775 | { | |
776 | *ap = NULL; | |
777 | *hap = NULL; | |
da2d1bc5 | 778 | #if defined RESOLVSORT |
5f0e6fc7 RM |
779 | /* |
780 | * Note: we sort even if host can take only one address | |
781 | * in its return structures - should give it the "best" | |
782 | * address in that case, not some random one | |
783 | */ | |
784 | if (_res.nsort && haveanswer > 1 && qtype == T_A) | |
785 | addrsort (host_data->h_addr_ptrs, haveanswer); | |
786 | #endif /*RESOLVSORT*/ | |
787 | ||
788 | if (result->h_name == NULL) | |
789 | { | |
790 | n = strlen (qname) + 1; /* For the \0. */ | |
8d8c6efa | 791 | if (n > linebuflen) |
0cc70fcf | 792 | goto too_small; |
8d8c6efa | 793 | if (n >= MAXHOSTNAMELEN) |
76b87c03 | 794 | goto no_recovery; |
8d8c6efa UD |
795 | result->h_name = bp; |
796 | bp = __mempcpy (bp, qname, n); /* Cannot overflow. */ | |
5f0e6fc7 RM |
797 | linebuflen -= n; |
798 | } | |
799 | ||
b455972f | 800 | if (have_to_map) |
5f0e6fc7 RM |
801 | map_v4v6_hostent (result, &bp, &linebuflen); |
802 | *h_errnop = NETDB_SUCCESS; | |
803 | return NSS_STATUS_SUCCESS; | |
804 | } | |
76b87c03 UD |
805 | no_recovery: |
806 | *h_errnop = NO_RECOVERY; | |
a0bf6ac7 | 807 | *errnop = ENOENT; |
5f0e6fc7 RM |
808 | return NSS_STATUS_TRYAGAIN; |
809 | } |