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Commit | Line | Data |
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d7ce7006 | 1 | /*\r |
2 | * ++Copyright++ 1985, 1988, 1993\r | |
3 | * -\r | |
4 | * Copyright (c) 1985, 1988, 1993\r | |
5 | * The Regents of the University of California. All rights reserved.\r | |
6 | *\r | |
7 | * Redistribution and use in source and binary forms, with or without\r | |
8 | * modification, are permitted provided that the following conditions\r | |
9 | * are met:\r | |
10 | * 1. Redistributions of source code must retain the above copyright\r | |
11 | * notice, this list of conditions and the following disclaimer.\r | |
12 | * 2. Redistributions in binary form must reproduce the above copyright\r | |
13 | * notice, this list of conditions and the following disclaimer in the\r | |
14 | * documentation and/or other materials provided with the distribution.\r | |
15 | * 3. All advertising materials mentioning features or use of this software\r | |
16 | * must display the following acknowledgement:\r | |
17 | * This product includes software developed by the University of\r | |
18 | * California, Berkeley and its contributors.\r | |
19 | * 4. Neither the name of the University nor the names of its contributors\r | |
20 | * may be used to endorse or promote products derived from this software\r | |
21 | * without specific prior written permission.\r | |
22 | *\r | |
23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r | |
24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r | |
25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r | |
26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r | |
27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r | |
28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r | |
29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r | |
30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r | |
31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r | |
32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r | |
33 | * SUCH DAMAGE.\r | |
34 | * -\r | |
35 | * Portions Copyright (c) 1993 by Digital Equipment Corporation.\r | |
36 | *\r | |
37 | * Permission to use, copy, modify, and distribute this software for any\r | |
38 | * purpose with or without fee is hereby granted, provided that the above\r | |
39 | * copyright notice and this permission notice appear in all copies, and that\r | |
40 | * the name of Digital Equipment Corporation not be used in advertising or\r | |
41 | * publicity pertaining to distribution of the document or software without\r | |
42 | * specific, written prior permission.\r | |
43 | *\r | |
44 | * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL\r | |
45 | * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES\r | |
46 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT\r | |
47 | * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL\r | |
48 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR\r | |
49 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS\r | |
50 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS\r | |
51 | * SOFTWARE.\r | |
52 | * -\r | |
53 | * --Copyright--\r | |
54 | */\r | |
55 | \r | |
56 | /*\r | |
57 | * Portions copyright (c) 1999, 2000\r | |
58 | * Intel Corporation.\r | |
59 | * All rights reserved.\r | |
60 | * \r | |
61 | * Redistribution and use in source and binary forms, with or without\r | |
62 | * modification, are permitted provided that the following conditions\r | |
63 | * are met:\r | |
64 | * \r | |
65 | * 1. Redistributions of source code must retain the above copyright\r | |
66 | * notice, this list of conditions and the following disclaimer.\r | |
67 | * \r | |
68 | * 2. Redistributions in binary form must reproduce the above copyright\r | |
69 | * notice, this list of conditions and the following disclaimer in the\r | |
70 | * documentation and/or other materials provided with the distribution.\r | |
71 | * \r | |
72 | * 3. All advertising materials mentioning features or use of this software\r | |
73 | * must display the following acknowledgement:\r | |
74 | * \r | |
75 | * This product includes software developed by Intel Corporation and\r | |
76 | * its contributors.\r | |
77 | * \r | |
78 | * 4. Neither the name of Intel Corporation or its contributors may be\r | |
79 | * used to endorse or promote products derived from this software\r | |
80 | * without specific prior written permission.\r | |
81 | * \r | |
82 | * THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION AND CONTRIBUTORS ``AS IS''\r | |
83 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r | |
84 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r | |
85 | * ARE DISCLAIMED. IN NO EVENT SHALL INTEL CORPORATION OR CONTRIBUTORS BE\r | |
86 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR\r | |
87 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF\r | |
88 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\r | |
89 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\r | |
90 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\r | |
91 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF\r | |
92 | * THE POSSIBILITY OF SUCH DAMAGE.\r | |
93 | * \r | |
94 | */\r | |
95 | \r | |
96 | #if defined(LIBC_SCCS) && !defined(lint)\r | |
97 | static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";\r | |
98 | static char fromrcsid[] = "From: Id: gethnamaddr.c,v 8.23 1998/04/07 04:59:46 vixie Exp $";\r | |
99 | static char rcsid[] = "$Id: gethostbydns.c,v 1.1.1.1 2003/11/19 01:51:27 kyu3 Exp $";\r | |
100 | #endif /* LIBC_SCCS and not lint */\r | |
101 | \r | |
102 | #include <sys/types.h>\r | |
103 | #include <sys/param.h>\r | |
104 | #include <sys/socket.h>\r | |
105 | #include <netinet/in.h>\r | |
106 | #include <arpa/inet.h>\r | |
107 | #include <arpa/nameser.h>\r | |
108 | \r | |
109 | #include <stdio.h>\r | |
110 | #include <unistd.h>\r | |
111 | #include <string.h>\r | |
112 | #include <netdb.h>\r | |
113 | #include <resolv.h>\r | |
114 | #include <ctype.h>\r | |
115 | #include <errno.h>\r | |
116 | #ifdef _ORG_FREEBSD_\r | |
117 | #include <syslog.h>\r | |
118 | #else\r | |
119 | #include <stdlib.h>\r | |
120 | u_int32_t _getlong(const u_char *src);\r | |
121 | u_int16_t _getshort(const u_char *src);\r | |
122 | #endif\r | |
123 | \r | |
124 | #include "res_config.h"\r | |
125 | #include "Socklib_internals.h"\r | |
126 | \r | |
127 | #define SPRINTF(x) ((size_t)sprintf x)\r | |
128 | \r | |
129 | #define MAXALIASES 35\r | |
130 | #define MAXADDRS 35\r | |
131 | \r | |
132 | static const char AskedForGot[] =\r | |
133 | "gethostby*.gethostanswer: asked for \"%s\", got \"%s\"";\r | |
134 | \r | |
135 | static char *h_addr_ptrs[MAXADDRS + 1];\r | |
136 | \r | |
137 | static struct hostent host;\r | |
138 | static char *host_aliases[MAXALIASES];\r | |
139 | static char hostbuf[8*1024];\r | |
140 | static u_char host_addr[16]; /* IPv4 or IPv6 */\r | |
141 | \r | |
142 | #ifdef RESOLVSORT\r | |
143 | static void addrsort(char **, int);\r | |
144 | #endif\r | |
145 | \r | |
146 | #if PACKETSZ > 1024\r | |
147 | #define MAXPACKET PACKETSZ\r | |
148 | #else\r | |
149 | #define MAXPACKET 1024\r | |
150 | #endif\r | |
151 | \r | |
152 | typedef union {\r | |
153 | HEADER hdr;\r | |
154 | u_char buf[MAXPACKET];\r | |
155 | } querybuf;\r | |
156 | \r | |
157 | typedef union {\r | |
158 | int32_t al;\r | |
159 | char ac;\r | |
160 | } align;\r | |
161 | \r | |
162 | extern int h_errno;\r | |
163 | int _dns_ttl_;\r | |
164 | \r | |
165 | #ifdef DEBUG_RES\r | |
166 | static void\r | |
167 | dprintf(char *msg, int num)\r | |
168 | {\r | |
169 | if (_res.options & RES_DEBUG) {\r | |
170 | int save = errno;\r | |
171 | \r | |
172 | printf(msg, num);\r | |
173 | errno = save;\r | |
174 | }\r | |
175 | }\r | |
176 | #else\r | |
177 | # define dprintf(msg, num) /*nada*/\r | |
178 | #endif\r | |
179 | \r | |
180 | #define BOUNDED_INCR(x) \\r | |
181 | do { \\r | |
182 | cp += x; \\r | |
183 | if (cp > eom) { \\r | |
184 | h_errno = NO_RECOVERY; \\r | |
185 | return (NULL); \\r | |
186 | } \\r | |
187 | } while (0)\r | |
188 | \r | |
189 | #define BOUNDS_CHECK(ptr, count) \\r | |
190 | do { \\r | |
191 | if ((ptr) + (count) > eom) { \\r | |
192 | h_errno = NO_RECOVERY; \\r | |
193 | return (NULL); \\r | |
194 | } \\r | |
195 | } while (0)\r | |
196 | \r | |
197 | static struct hostent *\r | |
198 | gethostanswer(const querybuf *answer, int anslen, const char *qname, int qtype)\r | |
199 | {\r | |
200 | register const HEADER *hp;\r | |
201 | register const u_char *cp;\r | |
202 | register int n;\r | |
203 | const u_char *eom, *erdata;\r | |
204 | char *bp, **ap, **hap;\r | |
205 | int type, class, buflen, ancount, qdcount;\r | |
206 | int haveanswer, had_error;\r | |
207 | int toobig = 0;\r | |
208 | char tbuf[MAXDNAME];\r | |
209 | const char *tname;\r | |
210 | int (*name_ok)(const char *);\r | |
211 | \r | |
212 | tname = qname;\r | |
213 | host.h_name = NULL;\r | |
214 | eom = answer->buf + anslen;\r | |
215 | switch (qtype) {\r | |
216 | case T_A:\r | |
217 | case T_AAAA:\r | |
218 | name_ok = res_hnok;\r | |
219 | break;\r | |
220 | case T_PTR:\r | |
221 | name_ok = res_dnok;\r | |
222 | break;\r | |
223 | default:\r | |
224 | h_errno = NO_RECOVERY;\r | |
225 | return (NULL); /* XXX should be abort(); */\r | |
226 | }\r | |
227 | /*\r | |
228 | * find first satisfactory answer\r | |
229 | */\r | |
230 | hp = &answer->hdr;\r | |
231 | ancount = ntohs(hp->ancount);\r | |
232 | qdcount = ntohs(hp->qdcount);\r | |
233 | bp = hostbuf;\r | |
234 | buflen = sizeof hostbuf;\r | |
235 | cp = answer->buf;\r | |
236 | BOUNDED_INCR(HFIXEDSZ);\r | |
237 | if (qdcount != 1) {\r | |
238 | h_errno = NO_RECOVERY;\r | |
239 | return (NULL);\r | |
240 | }\r | |
241 | n = dn_expand(answer->buf, eom, cp, bp, buflen);\r | |
242 | if ((n < 0) || !(*name_ok)(bp)) {\r | |
243 | h_errno = NO_RECOVERY;\r | |
244 | return (NULL);\r | |
245 | }\r | |
246 | BOUNDED_INCR(n + QFIXEDSZ);\r | |
247 | if (qtype == T_A || qtype == T_AAAA) {\r | |
248 | /* res_send() has already verified that the query name is the\r | |
249 | * same as the one we sent; this just gets the expanded name\r | |
250 | * (i.e., with the succeeding search-domain tacked on).\r | |
251 | */\r | |
252 | n = (int)strlen(bp) + 1; /* for the \0 */\r | |
253 | if (n >= MAXHOSTNAMELEN) {\r | |
254 | h_errno = NO_RECOVERY;\r | |
255 | return (NULL);\r | |
256 | }\r | |
257 | host.h_name = bp;\r | |
258 | bp += n;\r | |
259 | buflen -= n;\r | |
260 | /* The qname can be abbreviated, but h_name is now absolute. */\r | |
261 | qname = host.h_name;\r | |
262 | }\r | |
263 | ap = host_aliases;\r | |
264 | *ap = NULL;\r | |
265 | host.h_aliases = host_aliases;\r | |
266 | hap = h_addr_ptrs;\r | |
267 | *hap = NULL;\r | |
268 | host.h_addr_list = h_addr_ptrs;\r | |
269 | haveanswer = 0;\r | |
270 | had_error = 0;\r | |
271 | _dns_ttl_ = -1;\r | |
272 | while (ancount-- > 0 && cp < eom && !had_error) {\r | |
273 | n = dn_expand(answer->buf, eom, cp, bp, buflen);\r | |
274 | if ((n < 0) || !(*name_ok)(bp)) {\r | |
275 | had_error++;\r | |
276 | continue;\r | |
277 | }\r | |
278 | cp += n; /* name */\r | |
279 | BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ);\r | |
280 | type = _getshort(cp);\r | |
281 | cp += INT16SZ; /* type */\r | |
282 | class = _getshort(cp);\r | |
283 | cp += INT16SZ; /* class */\r | |
284 | if (qtype == T_A && type == T_A)\r | |
285 | _dns_ttl_ = _getlong(cp);\r | |
286 | cp += INT32SZ; /* TTL */\r | |
287 | n = _getshort(cp);\r | |
288 | cp += INT16SZ; /* len */\r | |
289 | BOUNDS_CHECK(cp, n);\r | |
290 | erdata = cp + n;\r | |
291 | if (class != C_IN) {\r | |
292 | /* XXX - debug? syslog? */\r | |
293 | cp += n;\r | |
294 | continue; /* XXX - had_error++ ? */\r | |
295 | }\r | |
296 | if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) {\r | |
297 | if (ap >= &host_aliases[MAXALIASES-1])\r | |
298 | continue;\r | |
299 | n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);\r | |
300 | if ((n < 0) || !(*name_ok)(tbuf)) {\r | |
301 | had_error++;\r | |
302 | continue;\r | |
303 | }\r | |
304 | cp += n;\r | |
305 | if (cp != erdata) {\r | |
306 | h_errno = NO_RECOVERY;\r | |
307 | return (NULL);\r | |
308 | }\r | |
309 | /* Store alias. */\r | |
310 | *ap++ = bp;\r | |
311 | n = (int)strlen(bp) + 1; /* for the \0 */\r | |
312 | if (n >= MAXHOSTNAMELEN) {\r | |
313 | had_error++;\r | |
314 | continue;\r | |
315 | }\r | |
316 | bp += n;\r | |
317 | buflen -= n;\r | |
318 | /* Get canonical name. */\r | |
319 | n = (int)strlen(tbuf) + 1; /* for the \0 */\r | |
320 | if (n > buflen || n >= MAXHOSTNAMELEN) {\r | |
321 | had_error++;\r | |
322 | continue;\r | |
323 | }\r | |
324 | strcpy(bp, tbuf);\r | |
325 | host.h_name = bp;\r | |
326 | bp += n;\r | |
327 | buflen -= n;\r | |
328 | continue;\r | |
329 | }\r | |
330 | if (qtype == T_PTR && type == T_CNAME) {\r | |
331 | n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);\r | |
332 | if (n < 0 || !res_dnok(tbuf)) {\r | |
333 | had_error++;\r | |
334 | continue;\r | |
335 | }\r | |
336 | cp += n;\r | |
337 | if (cp != erdata) {\r | |
338 | h_errno = NO_RECOVERY;\r | |
339 | return (NULL);\r | |
340 | }\r | |
341 | /* Get canonical name. */\r | |
342 | n = (int)strlen(tbuf) + 1; /* for the \0 */\r | |
343 | if (n > buflen || n >= MAXHOSTNAMELEN) {\r | |
344 | had_error++;\r | |
345 | continue;\r | |
346 | }\r | |
347 | strcpy(bp, tbuf);\r | |
348 | tname = bp;\r | |
349 | bp += n;\r | |
350 | buflen -= n;\r | |
351 | continue;\r | |
352 | }\r | |
353 | if (type != qtype) {\r | |
354 | #ifdef _ORG_FREEBSD_\r | |
355 | syslog(LOG_NOTICE|LOG_AUTH,\r | |
356 | "gethostby*.gethostanswer: asked for \"%s %s %s\", got type \"%s\"",\r | |
357 | qname, p_class(C_IN), p_type(qtype),\r | |
358 | p_type(type));\r | |
359 | #endif\r | |
360 | cp += n;\r | |
361 | continue; /* XXX - had_error++ ? */\r | |
362 | }\r | |
363 | switch (type) {\r | |
364 | case T_PTR:\r | |
365 | if (strcasecmp(tname, bp) != 0) {\r | |
366 | #ifdef _ORG_FREEBSD_\r | |
367 | syslog(LOG_NOTICE|LOG_AUTH,\r | |
368 | AskedForGot, qname, bp);\r | |
369 | #endif\r | |
370 | cp += n;\r | |
371 | continue; /* XXX - had_error++ ? */\r | |
372 | }\r | |
373 | n = dn_expand(answer->buf, eom, cp, bp, buflen);\r | |
374 | if ((n < 0) || !res_hnok(bp)) {\r | |
375 | had_error++;\r | |
376 | break;\r | |
377 | }\r | |
378 | #if MULTI_PTRS_ARE_ALIASES\r | |
379 | cp += n;\r | |
380 | if (cp != erdata) {\r | |
381 | h_errno = NO_RECOVERY;\r | |
382 | return (NULL);\r | |
383 | }\r | |
384 | if (!haveanswer)\r | |
385 | host.h_name = bp;\r | |
386 | else if (ap < &host_aliases[MAXALIASES-1])\r | |
387 | *ap++ = bp;\r | |
388 | else\r | |
389 | n = -1;\r | |
390 | if (n != -1) {\r | |
391 | n = (int)strlen(bp) + 1; /* for the \0 */\r | |
392 | if (n >= MAXHOSTNAMELEN) {\r | |
393 | had_error++;\r | |
394 | break;\r | |
395 | }\r | |
396 | bp += n;\r | |
397 | buflen -= n;\r | |
398 | }\r | |
399 | break;\r | |
400 | #else\r | |
401 | host.h_name = bp;\r | |
402 | if (_res.options & RES_USE_INET6) {\r | |
403 | n = strlen(bp) + 1; /* for the \0 */\r | |
404 | if (n >= MAXHOSTNAMELEN) {\r | |
405 | had_error++;\r | |
406 | break;\r | |
407 | }\r | |
408 | bp += n;\r | |
409 | buflen -= n;\r | |
410 | _map_v4v6_hostent(&host, &bp, &buflen);\r | |
411 | }\r | |
412 | h_errno = NETDB_SUCCESS;\r | |
413 | return (&host);\r | |
414 | #endif\r | |
415 | case T_A:\r | |
416 | case T_AAAA:\r | |
417 | if (strcasecmp(host.h_name, bp) != 0) {\r | |
418 | #ifdef _ORG_FREEBSD_\r | |
419 | syslog(LOG_NOTICE|LOG_AUTH,\r | |
420 | AskedForGot, host.h_name, bp);\r | |
421 | #endif\r | |
422 | cp += n;\r | |
423 | continue; /* XXX - had_error++ ? */\r | |
424 | }\r | |
425 | if (n != host.h_length) {\r | |
426 | cp += n;\r | |
427 | continue;\r | |
428 | }\r | |
429 | if (!haveanswer) {\r | |
430 | register int nn;\r | |
431 | \r | |
432 | host.h_name = bp;\r | |
433 | nn = (int)strlen(bp) + 1; /* for the \0 */\r | |
434 | bp += nn;\r | |
435 | buflen -= nn;\r | |
436 | }\r | |
437 | \r | |
438 | bp += sizeof(align) - ((size_t)bp % sizeof(align));\r | |
439 | \r | |
440 | if (bp + n >= &hostbuf[sizeof hostbuf]) {\r | |
441 | dprintf("size (%d) too big\n", n);\r | |
442 | had_error++;\r | |
443 | continue;\r | |
444 | }\r | |
445 | if (hap >= &h_addr_ptrs[MAXADDRS-1]) {\r | |
446 | if (!toobig++)\r | |
447 | dprintf("Too many addresses (%d)\n",\r | |
448 | MAXADDRS);\r | |
449 | cp += n;\r | |
450 | continue;\r | |
451 | }\r | |
452 | *hap++ = bp;\r | |
453 | bcopy(cp, bp, n);\r | |
454 | bp += n;\r | |
455 | buflen -= n;\r | |
456 | cp += n;\r | |
457 | if (cp != erdata) {\r | |
458 | h_errno = NO_RECOVERY;\r | |
459 | return (NULL);\r | |
460 | }\r | |
461 | break;\r | |
462 | default:\r | |
463 | dprintf("Impossible condition (type=%d)\n", type);\r | |
464 | h_errno = NO_RECOVERY;\r | |
465 | return (NULL);\r | |
466 | /* BIND has abort() here, too risky on bad data */\r | |
467 | }\r | |
468 | if (!had_error)\r | |
469 | haveanswer++;\r | |
470 | }\r | |
471 | if (haveanswer) {\r | |
472 | *ap = NULL;\r | |
473 | *hap = NULL;\r | |
474 | # if defined(RESOLVSORT)\r | |
475 | /*\r | |
476 | * Note: we sort even if host can take only one address\r | |
477 | * in its return structures - should give it the "best"\r | |
478 | * address in that case, not some random one\r | |
479 | */\r | |
480 | if (_res.nsort && haveanswer > 1 && qtype == T_A)\r | |
481 | addrsort(h_addr_ptrs, haveanswer);\r | |
482 | # endif /*RESOLVSORT*/\r | |
483 | if (!host.h_name) {\r | |
484 | n = (int)strlen(qname) + 1; /* for the \0 */\r | |
485 | if (n > buflen || n >= MAXHOSTNAMELEN)\r | |
486 | goto no_recovery;\r | |
487 | strcpy(bp, qname);\r | |
488 | host.h_name = bp;\r | |
489 | bp += n;\r | |
490 | buflen -= n;\r | |
491 | }\r | |
492 | if (_res.options & RES_USE_INET6)\r | |
493 | _map_v4v6_hostent(&host, &bp, &buflen);\r | |
494 | h_errno = NETDB_SUCCESS;\r | |
495 | return (&host);\r | |
496 | }\r | |
497 | no_recovery:\r | |
498 | h_errno = NO_RECOVERY;\r | |
499 | return (NULL);\r | |
500 | }\r | |
501 | \r | |
502 | struct hostent *\r | |
503 | __dns_getanswer(const char *answer, int anslen, const char *qname, int qtype)\r | |
504 | {\r | |
505 | switch(qtype) {\r | |
506 | case T_AAAA:\r | |
507 | host.h_addrtype = AF_INET6;\r | |
508 | host.h_length = IN6ADDRSZ;\r | |
509 | break;\r | |
510 | case T_A:\r | |
511 | default:\r | |
512 | host.h_addrtype = AF_INET;\r | |
513 | host.h_length = INADDRSZ;\r | |
514 | break;\r | |
515 | }\r | |
516 | \r | |
517 | return(gethostanswer((const querybuf *)answer, anslen, qname, qtype));\r | |
518 | }\r | |
519 | \r | |
520 | struct hostent *\r | |
521 | _gethostbydnsname(const char *name, int af)\r | |
522 | {\r | |
523 | querybuf buf;\r | |
524 | register const char *cp;\r | |
525 | char *bp;\r | |
526 | int n, size, type, len;\r | |
527 | \r | |
528 | if ((_res.options & RES_INIT) == 0 && res_init() == -1) {\r | |
529 | h_errno = NETDB_INTERNAL;\r | |
530 | return (NULL);\r | |
531 | }\r | |
532 | \r | |
533 | switch (af) {\r | |
534 | case AF_INET:\r | |
535 | size = INADDRSZ;\r | |
536 | type = T_A;\r | |
537 | break;\r | |
538 | case AF_INET6:\r | |
539 | size = IN6ADDRSZ;\r | |
540 | type = T_AAAA;\r | |
541 | break;\r | |
542 | default:\r | |
543 | h_errno = NETDB_INTERNAL;\r | |
544 | errno = EAFNOSUPPORT;\r | |
545 | return (NULL);\r | |
546 | }\r | |
547 | \r | |
548 | host.h_addrtype = af;\r | |
549 | host.h_length = size;\r | |
550 | \r | |
551 | /*\r | |
552 | * if there aren't any dots, it could be a user-level alias.\r | |
553 | * this is also done in res_query() since we are not the only\r | |
554 | * function that looks up host names.\r | |
555 | */\r | |
556 | if (!strchr(name, '.') && ( NULL != (cp = __hostalias(name))))\r | |
557 | name = cp;\r | |
558 | \r | |
559 | /*\r | |
560 | * disallow names consisting only of digits/dots, unless\r | |
561 | * they end in a dot.\r | |
562 | */\r | |
563 | if (isdigit(name[0]))\r | |
564 | for (cp = name;; ++cp) {\r | |
565 | if (!*cp) {\r | |
566 | if (*--cp == '.')\r | |
567 | break;\r | |
568 | /*\r | |
569 | * All-numeric, no dot at the end.\r | |
570 | * Fake up a hostent as if we'd actually\r | |
571 | * done a lookup.\r | |
572 | */\r | |
573 | if (inet_pton(af, name, host_addr) <= 0) {\r | |
574 | h_errno = HOST_NOT_FOUND;\r | |
575 | return (NULL);\r | |
576 | }\r | |
577 | strncpy(hostbuf, name, MAXDNAME);\r | |
578 | hostbuf[MAXDNAME] = '\0';\r | |
579 | bp = hostbuf + MAXDNAME;\r | |
580 | len = sizeof hostbuf - MAXDNAME;\r | |
581 | host.h_name = hostbuf;\r | |
582 | host.h_aliases = host_aliases;\r | |
583 | host_aliases[0] = NULL;\r | |
584 | h_addr_ptrs[0] = (char *)host_addr;\r | |
585 | h_addr_ptrs[1] = NULL;\r | |
586 | host.h_addr_list = h_addr_ptrs;\r | |
587 | if (_res.options & RES_USE_INET6)\r | |
588 | _map_v4v6_hostent(&host, &bp, &len);\r | |
589 | h_errno = NETDB_SUCCESS;\r | |
590 | return (&host);\r | |
591 | }\r | |
592 | if (!isdigit(*cp) && *cp != '.') \r | |
593 | break;\r | |
594 | }\r | |
595 | if ((isxdigit(name[0]) && strchr(name, ':') != NULL) ||\r | |
596 | name[0] == ':')\r | |
597 | for (cp = name;; ++cp) {\r | |
598 | if (!*cp) {\r | |
599 | if (*--cp == '.')\r | |
600 | break;\r | |
601 | /*\r | |
602 | * All-IPv6-legal, no dot at the end.\r | |
603 | * Fake up a hostent as if we'd actually\r | |
604 | * done a lookup.\r | |
605 | */\r | |
606 | if (inet_pton(af, name, host_addr) <= 0) {\r | |
607 | h_errno = HOST_NOT_FOUND;\r | |
608 | return (NULL);\r | |
609 | }\r | |
610 | strncpy(hostbuf, name, MAXDNAME);\r | |
611 | hostbuf[MAXDNAME] = '\0';\r | |
612 | bp = hostbuf + MAXDNAME;\r | |
613 | len = sizeof hostbuf - MAXDNAME;\r | |
614 | host.h_name = hostbuf;\r | |
615 | host.h_aliases = host_aliases;\r | |
616 | host_aliases[0] = NULL;\r | |
617 | h_addr_ptrs[0] = (char *)host_addr;\r | |
618 | h_addr_ptrs[1] = NULL;\r | |
619 | host.h_addr_list = h_addr_ptrs;\r | |
620 | h_errno = NETDB_SUCCESS;\r | |
621 | return (&host);\r | |
622 | }\r | |
623 | if (!isxdigit(*cp) && *cp != ':' && *cp != '.') \r | |
624 | break;\r | |
625 | }\r | |
626 | \r | |
627 | if ((n = res_search(name, C_IN, type, buf.buf, sizeof(buf))) < 0) {\r | |
628 | dprintf("res_search failed (%d)\n", n);\r | |
629 | return (NULL);\r | |
630 | }\r | |
631 | return (gethostanswer(&buf, n, name, type));\r | |
632 | }\r | |
633 | \r | |
634 | struct hostent *\r | |
635 | _gethostbydnsaddr(const char *addr, int len, int af)\r | |
636 | {\r | |
637 | const u_char *uaddr = (const u_char *)addr;\r | |
638 | static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff };\r | |
639 | static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 };\r | |
640 | int n, size;\r | |
641 | querybuf buf;\r | |
642 | register struct hostent *hp;\r | |
643 | char qbuf[MAXDNAME+1], *qp;\r | |
644 | #ifdef SUNSECURITY\r | |
645 | register struct hostent *rhp;\r | |
646 | char **haddr;\r | |
647 | u_long old_options;\r | |
648 | char hname2[MAXDNAME+1];\r | |
649 | #endif /*SUNSECURITY*/\r | |
650 | \r | |
651 | if ((_res.options & RES_INIT) == 0 && res_init() == -1) {\r | |
652 | h_errno = NETDB_INTERNAL;\r | |
653 | return (NULL);\r | |
654 | }\r | |
655 | if (af == AF_INET6 && len == IN6ADDRSZ &&\r | |
656 | (!bcmp(uaddr, mapped, sizeof mapped) ||\r | |
657 | !bcmp(uaddr, tunnelled, sizeof tunnelled))) {\r | |
658 | /* Unmap. */\r | |
659 | addr += sizeof mapped;\r | |
660 | uaddr += sizeof mapped;\r | |
661 | af = AF_INET;\r | |
662 | len = INADDRSZ;\r | |
663 | }\r | |
664 | switch (af) {\r | |
665 | case AF_INET:\r | |
666 | size = INADDRSZ;\r | |
667 | break;\r | |
668 | case AF_INET6:\r | |
669 | size = IN6ADDRSZ;\r | |
670 | break;\r | |
671 | default:\r | |
672 | errno = EAFNOSUPPORT;\r | |
673 | h_errno = NETDB_INTERNAL;\r | |
674 | return (NULL);\r | |
675 | }\r | |
676 | if (size != len) {\r | |
677 | errno = EINVAL;\r | |
678 | h_errno = NETDB_INTERNAL;\r | |
679 | return (NULL);\r | |
680 | }\r | |
681 | switch (af) {\r | |
682 | case AF_INET:\r | |
683 | (void) sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa",\r | |
684 | (uaddr[3] & 0xff),\r | |
685 | (uaddr[2] & 0xff),\r | |
686 | (uaddr[1] & 0xff),\r | |
687 | (uaddr[0] & 0xff));\r | |
688 | break;\r | |
689 | case AF_INET6:\r | |
690 | qp = qbuf;\r | |
691 | for (n = IN6ADDRSZ - 1; n >= 0; n--) {\r | |
692 | qp += SPRINTF((qp, "%x.%x.",\r | |
693 | uaddr[n] & 0xf,\r | |
694 | (uaddr[n] >> 4) & 0xf));\r | |
695 | }\r | |
696 | strcpy(qp, "ip6.int");\r | |
697 | break;\r | |
698 | default:\r | |
699 | abort();\r | |
700 | }\r | |
701 | n = res_query(qbuf, C_IN, T_PTR, (u_char *)buf.buf, sizeof buf.buf);\r | |
702 | if (n < 0) {\r | |
703 | dprintf("res_query failed (%d)\n", n);\r | |
704 | return (NULL);\r | |
705 | }\r | |
706 | if ( NULL == (hp = gethostanswer(&buf, n, qbuf, T_PTR)))\r | |
707 | return (NULL); /* h_errno was set by gethostanswer() */\r | |
708 | #ifdef SUNSECURITY\r | |
709 | if (af == AF_INET) {\r | |
710 | /*\r | |
711 | * turn off search as the name should be absolute,\r | |
712 | * 'localhost' should be matched by defnames\r | |
713 | */\r | |
714 | strncpy(hname2, hp->h_name, MAXDNAME);\r | |
715 | hname2[MAXDNAME] = '\0';\r | |
716 | old_options = _res.options;\r | |
717 | _res.options &= ~RES_DNSRCH;\r | |
718 | _res.options |= RES_DEFNAMES;\r | |
719 | if (!(rhp = gethostbyname(hname2))) {\r | |
720 | #ifdef _ORG_FREEBSD_\r | |
721 | syslog(LOG_NOTICE|LOG_AUTH,\r | |
722 | "gethostbyaddr: No A record for %s (verifying [%s])",\r | |
723 | hname2, inet_ntoa(*((struct in_addr *)addr)));\r | |
724 | #endif\r | |
725 | _res.options = old_options;\r | |
726 | h_errno = HOST_NOT_FOUND;\r | |
727 | return (NULL);\r | |
728 | }\r | |
729 | _res.options = old_options;\r | |
730 | for (haddr = rhp->h_addr_list; *haddr; haddr++)\r | |
731 | if (!memcmp(*haddr, addr, INADDRSZ))\r | |
732 | break;\r | |
733 | if (!*haddr) {\r | |
734 | #ifdef _ORG_FREEBSD_\r | |
735 | syslog(LOG_NOTICE|LOG_AUTH,\r | |
736 | "gethostbyaddr: A record of %s != PTR record [%s]",\r | |
737 | hname2, inet_ntoa(*((struct in_addr *)addr)));\r | |
738 | #endif\r | |
739 | h_errno = HOST_NOT_FOUND;\r | |
740 | return (NULL);\r | |
741 | }\r | |
742 | }\r | |
743 | #endif /*SUNSECURITY*/\r | |
744 | hp->h_addrtype = af;\r | |
745 | hp->h_length = len;\r | |
746 | bcopy(addr, host_addr, len);\r | |
747 | h_addr_ptrs[0] = (char *)host_addr;\r | |
748 | h_addr_ptrs[1] = NULL;\r | |
749 | if (af == AF_INET && (_res.options & RES_USE_INET6)) {\r | |
750 | _map_v4v6_address((char*)host_addr, (char*)host_addr);\r | |
751 | hp->h_addrtype = AF_INET6;\r | |
752 | hp->h_length = IN6ADDRSZ;\r | |
753 | }\r | |
754 | h_errno = NETDB_SUCCESS;\r | |
755 | return (hp);\r | |
756 | }\r | |
757 | \r | |
758 | #ifdef RESOLVSORT\r | |
759 | static void\r | |
760 | addrsort(char **ap, int num)\r | |
761 | {\r | |
762 | short i, j;\r | |
763 | char **p;\r | |
764 | short aval[MAXADDRS];\r | |
765 | short needsort = 0;\r | |
766 | \r | |
767 | p = ap;\r | |
768 | for (i = 0; i < num; i++, p++) {\r | |
769 | for (j = 0 ; (unsigned)j < _res.nsort; j++)\r | |
770 | if (_res.sort_list[j].addr.s_addr == \r | |
771 | (((struct in_addr *)(*p))->s_addr & _res.sort_list[j].mask))\r | |
772 | break;\r | |
773 | aval[i] = j;\r | |
774 | if (needsort == 0 && i > 0 && j < aval[i-1])\r | |
775 | needsort = i;\r | |
776 | }\r | |
777 | if (!needsort)\r | |
778 | return;\r | |
779 | \r | |
780 | while (needsort < num) {\r | |
781 | for (j = needsort - 1; j >= 0; j--) {\r | |
782 | if (aval[j] > aval[j+1]) {\r | |
783 | char *hp;\r | |
784 | \r | |
785 | i = aval[j];\r | |
786 | aval[j] = aval[j+1];\r | |
787 | aval[j+1] = i;\r | |
788 | \r | |
789 | hp = ap[j];\r | |
790 | ap[j] = ap[j+1];\r | |
791 | ap[j+1] = hp;\r | |
792 | \r | |
793 | } else\r | |
794 | break;\r | |
795 | }\r | |
796 | needsort++;\r | |
797 | }\r | |
798 | }\r | |
799 | #endif\r | |
800 | void\r | |
801 | _sethostdnsent(int stayopen)\r | |
802 | {\r | |
803 | if ((_res.options & RES_INIT) == 0 && res_init() == -1)\r | |
804 | return;\r | |
805 | if (stayopen)\r | |
806 | _res.options |= RES_STAYOPEN | RES_USEVC;\r | |
807 | }\r | |
808 | \r | |
809 | void\r | |
810 | _endhostdnsent()\r | |
811 | {\r | |
812 | _res.options &= ~(RES_STAYOPEN | RES_USEVC);\r | |
813 | res_close();\r | |
814 | }\r |