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a334319f | 1 | /* Copyright (C) 1996, 1997, 1998, 1999, 2002, 2004 |
87bb6b6c | 2 | Free Software Foundation, Inc. |
84384f5b UD |
3 | This file is part of the GNU C Library. |
4 | Extended from original form by Ulrich Drepper <drepper@cygnus.com>, 1996. | |
5f0e6fc7 | 5 | |
84384f5b | 6 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
5f0e6fc7 | 10 | |
84384f5b UD |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
5f0e6fc7 | 15 | |
41bdb6e2 AJ |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
19 | 02111-1307 USA. */ | |
5f0e6fc7 RM |
20 | |
21 | /* Parts of this file are plain copies of the file `getnetnamadr.c' from | |
22 | the bind package and it has the following copyright. */ | |
23 | ||
24 | /* Copyright (c) 1993 Carlos Leandro and Rui Salgueiro | |
25 | * Dep. Matematica Universidade de Coimbra, Portugal, Europe | |
26 | * | |
27 | * Permission to use, copy, modify, and distribute this software for any | |
28 | * purpose with or without fee is hereby granted, provided that the above | |
29 | * copyright notice and this permission notice appear in all copies. | |
30 | */ | |
31 | /* | |
32 | * Copyright (c) 1983, 1993 | |
33 | * The Regents of the University of California. All rights reserved. | |
34 | * | |
35 | * Redistribution and use in source and binary forms, with or without | |
36 | * modification, are permitted provided that the following conditions | |
37 | * are met: | |
38 | * 1. Redistributions of source code must retain the above copyright | |
39 | * notice, this list of conditions and the following disclaimer. | |
40 | * 2. Redistributions in binary form must reproduce the above copyright | |
41 | * notice, this list of conditions and the following disclaimer in the | |
42 | * documentation and/or other materials provided with the distribution. | |
5f0e6fc7 RM |
43 | * 4. Neither the name of the University nor the names of its contributors |
44 | * may be used to endorse or promote products derived from this software | |
45 | * without specific prior written permission. | |
46 | * | |
47 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
48 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
49 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
50 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
51 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
52 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
53 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
54 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
55 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
56 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
57 | * SUCH DAMAGE. | |
58 | */ | |
59 | ||
60 | #include <ctype.h> | |
61 | #include <errno.h> | |
62 | #include <netdb.h> | |
63 | #include <stdio.h> | |
64 | #include <stdlib.h> | |
65 | #include <string.h> | |
66 | ||
67 | #include "nsswitch.h" | |
68 | #include <arpa/inet.h> | |
69 | ||
70 | /* Maximum number of aliases we allow. */ | |
71 | #define MAX_NR_ALIASES 48 | |
72 | ||
73 | ||
870d19de RM |
74 | #if PACKETSZ > 65536 |
75 | # define MAXPACKET PACKETSZ | |
5f0e6fc7 | 76 | #else |
870d19de | 77 | # define MAXPACKET 65536 |
5f0e6fc7 RM |
78 | #endif |
79 | ||
80 | ||
81 | typedef enum | |
82 | { | |
83 | BYADDR, | |
84 | BYNAME | |
85 | } lookup_method; | |
86 | ||
87 | ||
88 | /* We need this time later. */ | |
89 | typedef union querybuf | |
90 | { | |
91 | HEADER hdr; | |
92 | u_char buf[MAXPACKET]; | |
93 | } querybuf; | |
94 | ||
8d8c6efa UD |
95 | /* These functions are defined in res_comp.c. */ |
96 | #define NS_MAXCDNAME 255 /* maximum compressed domain name */ | |
79937577 UD |
97 | extern int __ns_name_ntop (const u_char *, char *, size_t) __THROW; |
98 | extern int __ns_name_unpack (const u_char *, const u_char *, | |
99 | const u_char *, u_char *, size_t) __THROW; | |
8d8c6efa | 100 | |
5f0e6fc7 | 101 | |
6d52618b | 102 | /* Prototypes for local functions. */ |
84384f5b UD |
103 | static enum nss_status getanswer_r (const querybuf *answer, int anslen, |
104 | struct netent *result, char *buffer, | |
a334319f | 105 | size_t buflen, lookup_method net_i); |
5f0e6fc7 RM |
106 | |
107 | ||
84384f5b | 108 | enum nss_status |
5f0e6fc7 | 109 | _nss_dns_getnetbyname_r (const char *name, struct netent *result, |
51eecc4a AJ |
110 | char *buffer, size_t buflen, int *errnop, |
111 | int *herrnop) | |
5f0e6fc7 RM |
112 | { |
113 | /* Return entry for network with NAME. */ | |
16b66062 AJ |
114 | union |
115 | { | |
116 | querybuf *buf; | |
117 | u_char *ptr; | |
118 | } net_buffer; | |
119 | querybuf *orig_net_buffer; | |
0420d888 | 120 | int anslen; |
5f0e6fc7 | 121 | char *qbuf; |
6166815d | 122 | enum nss_status status; |
5f0e6fc7 | 123 | |
87bb6b6c | 124 | if (__res_maybe_init (&_res, 0) == -1) |
b43b13ac UD |
125 | return NSS_STATUS_UNAVAIL; |
126 | ||
5f0e6fc7 | 127 | qbuf = strdupa (name); |
6166815d | 128 | |
16b66062 | 129 | net_buffer.buf = orig_net_buffer = (querybuf *) alloca (1024); |
6166815d | 130 | |
16b66062 AJ |
131 | anslen = __libc_res_nsearch (&_res, qbuf, C_IN, T_PTR, net_buffer.buf->buf, |
132 | 1024, &net_buffer.ptr); | |
5f0e6fc7 | 133 | if (anslen < 0) |
67479a70 UD |
134 | { |
135 | /* Nothing found. */ | |
136 | *errnop = errno; | |
16b66062 AJ |
137 | if (net_buffer.buf != orig_net_buffer) |
138 | free (net_buffer.buf); | |
67479a70 UD |
139 | return (errno == ECONNREFUSED |
140 | || errno == EPFNOSUPPORT | |
141 | || errno == EAFNOSUPPORT) | |
142 | ? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND; | |
143 | } | |
5f0e6fc7 | 144 | |
a334319f | 145 | status = getanswer_r (net_buffer.buf, anslen, result, buffer, buflen, BYNAME); |
16b66062 AJ |
146 | if (net_buffer.buf != orig_net_buffer) |
147 | free (net_buffer.buf); | |
6166815d | 148 | return status; |
5f0e6fc7 RM |
149 | } |
150 | ||
151 | ||
84384f5b | 152 | enum nss_status |
51eecc4a AJ |
153 | _nss_dns_getnetbyaddr_r (uint32_t net, int type, struct netent *result, |
154 | char *buffer, size_t buflen, int *errnop, | |
155 | int *herrnop) | |
5f0e6fc7 RM |
156 | { |
157 | /* Return entry for network with NAME. */ | |
84384f5b | 158 | enum nss_status status; |
16b66062 AJ |
159 | union |
160 | { | |
161 | querybuf *buf; | |
162 | u_char *ptr; | |
163 | } net_buffer; | |
164 | querybuf *orig_net_buffer; | |
5f0e6fc7 RM |
165 | unsigned int net_bytes[4]; |
166 | char qbuf[MAXDNAME]; | |
0420d888 | 167 | int cnt, anslen; |
5f0e6fc7 | 168 | u_int32_t net2; |
34816665 | 169 | int olderr = errno; |
5f0e6fc7 RM |
170 | |
171 | /* No net address lookup for IPv6 yet. */ | |
172 | if (type != AF_INET) | |
173 | return NSS_STATUS_UNAVAIL; | |
174 | ||
87bb6b6c | 175 | if (__res_maybe_init (&_res, 0) == -1) |
b43b13ac | 176 | return NSS_STATUS_UNAVAIL; |
51eecc4a | 177 | |
5f0e6fc7 RM |
178 | net2 = (u_int32_t) net; |
179 | for (cnt = 4; net2 != 0; net2 >>= 8) | |
180 | net_bytes[--cnt] = net2 & 0xff; | |
181 | ||
182 | switch (cnt) | |
183 | { | |
184 | case 3: | |
185 | /* Class A network. */ | |
186 | sprintf (qbuf, "0.0.0.%u.in-addr.arpa", net_bytes[3]); | |
187 | break; | |
188 | case 2: | |
189 | /* Class B network. */ | |
190 | sprintf (qbuf, "0.0.%u.%u.in-addr.arpa", net_bytes[3], net_bytes[2]); | |
191 | break; | |
192 | case 1: | |
193 | /* Class C network. */ | |
194 | sprintf (qbuf, "0.%u.%u.%u.in-addr.arpa", net_bytes[3], net_bytes[2], | |
195 | net_bytes[1]); | |
196 | break; | |
197 | case 0: | |
198 | /* Class D - E network. */ | |
199 | sprintf (qbuf, "%u.%u.%u.%u.in-addr.arpa", net_bytes[3], net_bytes[2], | |
200 | net_bytes[1], net_bytes[0]); | |
201 | break; | |
202 | } | |
203 | ||
16b66062 | 204 | net_buffer.buf = orig_net_buffer = (querybuf *) alloca (1024); |
6166815d | 205 | |
16b66062 AJ |
206 | anslen = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, net_buffer.buf->buf, |
207 | 1024, &net_buffer.ptr); | |
5f0e6fc7 | 208 | if (anslen < 0) |
67479a70 UD |
209 | { |
210 | /* Nothing found. */ | |
34816665 UD |
211 | int err = errno; |
212 | __set_errno (olderr); | |
16b66062 AJ |
213 | if (net_buffer.buf != orig_net_buffer) |
214 | free (net_buffer.buf); | |
34816665 UD |
215 | return (err == ECONNREFUSED |
216 | || err == EPFNOSUPPORT | |
217 | || err == EAFNOSUPPORT) | |
67479a70 UD |
218 | ? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND; |
219 | } | |
5f0e6fc7 | 220 | |
a334319f | 221 | status = getanswer_r (net_buffer.buf, anslen, result, buffer, buflen, BYADDR); |
16b66062 AJ |
222 | if (net_buffer.buf != orig_net_buffer) |
223 | free (net_buffer.buf); | |
5f0e6fc7 RM |
224 | if (status == NSS_STATUS_SUCCESS) |
225 | { | |
226 | /* Strip trailing zeros. */ | |
227 | unsigned int u_net = net; /* Maybe net should be unsigned? */ | |
228 | ||
229 | while ((u_net & 0xff) == 0 && u_net != 0) | |
230 | u_net >>= 8; | |
231 | result->n_net = u_net; | |
232 | } | |
233 | ||
234 | return status; | |
235 | } | |
236 | ||
237 | ||
238 | #undef offsetof | |
239 | #define offsetof(Type, Member) ((size_t) &((Type *) NULL)->Member) | |
240 | ||
84384f5b | 241 | static enum nss_status |
5f0e6fc7 | 242 | getanswer_r (const querybuf *answer, int anslen, struct netent *result, |
a334319f | 243 | char *buffer, size_t buflen, lookup_method net_i) |
5f0e6fc7 RM |
244 | { |
245 | /* | |
246 | * Find first satisfactory answer | |
247 | * | |
248 | * answer --> +------------+ ( MESSAGE ) | |
249 | * | Header | | |
250 | * +------------+ | |
251 | * | Question | the question for the name server | |
252 | * +------------+ | |
253 | * | Answer | RRs answering the question | |
254 | * +------------+ | |
255 | * | Authority | RRs pointing toward an authority | |
256 | * | Additional | RRs holding additional information | |
257 | * +------------+ | |
258 | */ | |
259 | struct net_data | |
260 | { | |
261 | char *aliases[MAX_NR_ALIASES]; | |
262 | char linebuffer[0]; | |
a334319f | 263 | } *net_data = (struct net_data *) buffer; |
5f0e6fc7 | 264 | int linebuflen = buflen - offsetof (struct net_data, linebuffer); |
a334319f | 265 | const char *end_of_message = &answer->buf[anslen]; |
5f0e6fc7 RM |
266 | const HEADER *header_pointer = &answer->hdr; |
267 | /* #/records in the answer section. */ | |
268 | int answer_count = ntohs (header_pointer->ancount); | |
269 | /* #/entries in the question section. */ | |
270 | int question_count = ntohs (header_pointer->qdcount); | |
271 | char *bp = net_data->linebuffer; | |
a334319f | 272 | const char *cp = &answer->buf[HFIXEDSZ]; |
5f0e6fc7 RM |
273 | char **alias_pointer; |
274 | int have_answer; | |
275 | char *ans; | |
8d8c6efa | 276 | u_char packtmp[NS_MAXCDNAME]; |
5f0e6fc7 RM |
277 | |
278 | if (question_count == 0) | |
7ef90c15 UD |
279 | { |
280 | /* FIXME: the Sun version uses for host name lookup an additional | |
281 | parameter for pointing to h_errno. this is missing here. | |
282 | OSF/1 has a per-thread h_errno variable. */ | |
283 | if (header_pointer->aa != 0) | |
284 | { | |
285 | __set_h_errno (HOST_NOT_FOUND); | |
286 | return NSS_STATUS_NOTFOUND; | |
287 | } | |
288 | else | |
289 | { | |
290 | __set_h_errno (TRY_AGAIN); | |
291 | return NSS_STATUS_TRYAGAIN; | |
292 | } | |
293 | } | |
5f0e6fc7 RM |
294 | |
295 | /* Skip the question part. */ | |
296 | while (question_count-- > 0) | |
9b57c1c1 RM |
297 | { |
298 | int n = __dn_skipname (cp, end_of_message); | |
299 | if (n < 0 || end_of_message - (cp + n) < QFIXEDSZ) | |
300 | { | |
301 | __set_h_errno (NO_RECOVERY); | |
302 | return NSS_STATUS_UNAVAIL; | |
303 | } | |
304 | cp += n + QFIXEDSZ; | |
305 | } | |
5f0e6fc7 RM |
306 | |
307 | alias_pointer = result->n_aliases = &net_data->aliases[0]; | |
308 | *alias_pointer = NULL; | |
309 | have_answer = 0; | |
310 | ans = NULL; | |
311 | ||
312 | while (--answer_count >= 0 && cp < end_of_message) | |
313 | { | |
314 | int n = dn_expand (answer->buf, end_of_message, cp, bp, linebuflen); | |
315 | int type, class; | |
316 | ||
8d8c6efa UD |
317 | n = __ns_name_unpack (answer->buf, end_of_message, cp, |
318 | packtmp, sizeof packtmp); | |
319 | if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) | |
320 | { | |
321 | if (errno == EMSGSIZE) | |
a334319f UD |
322 | { |
323 | errno = ERANGE; | |
324 | return NSS_STATUS_TRYAGAIN; | |
325 | } | |
8d8c6efa UD |
326 | |
327 | n = -1; | |
328 | } | |
329 | ||
330 | if (n > 0 && bp[0] == '.') | |
331 | bp[0] = '\0'; | |
332 | ||
5f0e6fc7 RM |
333 | if (n < 0 || res_dnok (bp) == 0) |
334 | break; | |
335 | cp += n; | |
336 | ans = strdupa (bp); | |
337 | GETSHORT (type, cp); | |
338 | GETSHORT (class, cp); | |
339 | cp += INT32SZ; /* TTL */ | |
340 | GETSHORT (n, cp); | |
341 | ||
342 | if (class == C_IN && type == T_PTR) | |
343 | { | |
8d8c6efa UD |
344 | n = __ns_name_unpack (answer->buf, end_of_message, cp, |
345 | packtmp, sizeof packtmp); | |
346 | if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) | |
347 | { | |
348 | if (errno == EMSGSIZE) | |
a334319f UD |
349 | { |
350 | errno = ERANGE; | |
351 | return NSS_STATUS_TRYAGAIN; | |
352 | } | |
8d8c6efa UD |
353 | |
354 | n = -1; | |
355 | } | |
356 | ||
5f0e6fc7 RM |
357 | if (n < 0 || !res_hnok (bp)) |
358 | { | |
359 | /* XXX What does this mean? The original form from bind | |
360 | returns NULL. Incrementing cp has no effect in any case. | |
361 | What should I return here. ??? */ | |
362 | cp += n; | |
363 | return NSS_STATUS_UNAVAIL; | |
364 | } | |
365 | cp += n; | |
9b57c1c1 RM |
366 | if (alias_pointer + 2 < &net_data->aliases[MAX_NR_ALIASES]) |
367 | { | |
368 | *alias_pointer++ = bp; | |
369 | n = strlen (bp) + 1; | |
370 | bp += n; | |
371 | linebuflen -= n; | |
372 | result->n_addrtype = class == C_IN ? AF_INET : AF_UNSPEC; | |
373 | ++have_answer; | |
374 | } | |
5f0e6fc7 RM |
375 | } |
376 | } | |
377 | ||
378 | if (have_answer) | |
379 | { | |
5f0e6fc7 RM |
380 | *alias_pointer = NULL; |
381 | switch (net_i) | |
382 | { | |
383 | case BYADDR: | |
0bf5c050 | 384 | result->n_name = *result->n_aliases++; |
5f0e6fc7 | 385 | result->n_net = 0L; |
0bf5c050 | 386 | return NSS_STATUS_SUCCESS; |
5f0e6fc7 | 387 | |
0bf5c050 RM |
388 | case BYNAME: |
389 | { | |
390 | char **ap = result->n_aliases++; | |
391 | while (*ap != NULL) | |
392 | { | |
393 | /* Check each alias name for being of the forms: | |
394 | 4.3.2.1.in-addr.arpa = net 1.2.3.4 | |
395 | 3.2.1.in-addr.arpa = net 0.1.2.3 | |
396 | 2.1.in-addr.arpa = net 0.0.1.2 | |
397 | 1.in-addr.arpa = net 0.0.0.1 | |
398 | */ | |
399 | uint32_t val = 0; /* Accumulator for n_net value. */ | |
400 | unsigned int shift = 0; /* Which part we are parsing now. */ | |
401 | const char *p = *ap; /* Consuming the string. */ | |
402 | do | |
403 | { | |
404 | /* Match the leading 0 or 0[xX] base indicator. */ | |
405 | unsigned int base = 10; | |
406 | if (*p == '0' && p[1] != '.') | |
407 | { | |
408 | base = 8; | |
409 | ++p; | |
410 | if (*p == 'x' || *p == 'X') | |
411 | { | |
412 | base = 16; | |
413 | ++p; | |
414 | if (*p == '.') | |
415 | break; /* No digit here. Give up on alias. */ | |
416 | } | |
417 | if (*p == '\0') | |
418 | break; | |
419 | } | |
420 | ||
421 | uint32_t part = 0; /* Accumulates this part's number. */ | |
422 | do | |
423 | { | |
424 | if (isdigit (*p) && (*p - '0' < base)) | |
425 | part = (part * base) + (*p - '0'); | |
426 | else if (base == 16 && isxdigit (*p)) | |
427 | part = (part << 4) + 10 + (tolower (*p) - 'a'); | |
428 | ++p; | |
429 | } while (*p != '\0' && *p != '.'); | |
430 | ||
431 | if (*p != '.') | |
432 | break; /* Bad form. Give up on this name. */ | |
433 | ||
434 | /* Install this as the next more significant byte. */ | |
435 | val |= part << shift; | |
436 | shift += 8; | |
437 | ++p; | |
438 | ||
439 | /* If we are out of digits now, there are two cases: | |
440 | 1. We are done with digits and now see "in-addr.arpa". | |
441 | 2. This is not the droid we are looking for. */ | |
442 | if (!isdigit (*p) && !strcasecmp (p, "in-addr.arpa")) | |
443 | { | |
444 | result->n_net = val; | |
445 | return NSS_STATUS_SUCCESS; | |
446 | } | |
447 | ||
448 | /* Keep going when we have seen fewer than 4 parts. */ | |
449 | } while (shift < 32); | |
450 | } | |
451 | } | |
5f0e6fc7 RM |
452 | break; |
453 | } | |
5f0e6fc7 RM |
454 | } |
455 | ||
a68b0d31 | 456 | __set_h_errno (TRY_AGAIN); |
5f0e6fc7 RM |
457 | return NSS_STATUS_TRYAGAIN; |
458 | } |