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vm: fix a null dereference on out-of-memory
[minix.git] / lib / libc / resolv / res_debug.c
blob4d9ec37dcd6d5827b8d764414389e38e6e69953a
1 /* $NetBSD: res_debug.c,v 1.11 2009/04/12 17:07:17 christos Exp $ */
2
3 /*
4 * Portions Copyright (C) 2004, 2005, 2008, 2009 Internet Systems Consortium, Inc. ("ISC")
5 * Portions Copyright (C) 1996-2003 Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
13 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
17 * PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 /*
21 * Copyright (c) 1985
22 * The Regents of the University of California. All rights reserved.
23 *
24 * Redistribution and use in source and binary forms, with or without
25 * modification, are permitted provided that the following conditions
26 * are met:
27 * 1. Redistributions of source code must retain the above copyright
28 * notice, this list of conditions and the following disclaimer.
29 * 2. Redistributions in binary form must reproduce the above copyright
30 * notice, this list of conditions and the following disclaimer in the
31 * documentation and/or other materials provided with the distribution.
32 * 3. All advertising materials mentioning features or use of this software
33 * must display the following acknowledgement:
34 * This product includes software developed by the University of
35 * California, Berkeley and its contributors.
36 * 4. Neither the name of the University nor the names of its contributors
37 * may be used to endorse or promote products derived from this software
38 * without specific prior written permission.
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 */
52
53 /*
54 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
55 *
56 * Permission to use, copy, modify, and distribute this software for any
57 * purpose with or without fee is hereby granted, provided that the above
58 * copyright notice and this permission notice appear in all copies, and that
59 * the name of Digital Equipment Corporation not be used in advertising or
60 * publicity pertaining to distribution of the document or software without
61 * specific, written prior permission.
62 *
63 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
64 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
65 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
66 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
67 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
68 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
69 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
70 * SOFTWARE.
71 */
72
73 /*
74 * Portions Copyright (c) 1995 by International Business Machines, Inc.
75 *
76 * International Business Machines, Inc. (hereinafter called IBM) grants
77 * permission under its copyrights to use, copy, modify, and distribute this
78 * Software with or without fee, provided that the above copyright notice and
79 * all paragraphs of this notice appear in all copies, and that the name of IBM
80 * not be used in connection with the marketing of any product incorporating
81 * the Software or modifications thereof, without specific, written prior
82 * permission.
83 *
84 * To the extent it has a right to do so, IBM grants an immunity from suit
85 * under its patents, if any, for the use, sale or manufacture of products to
86 * the extent that such products are used for performing Domain Name System
87 * dynamic updates in TCP/IP networks by means of the Software. No immunity is
88 * granted for any product per se or for any other function of any product.
89 *
90 * THE SOFTWARE IS PROVIDED "AS IS", AND IBM DISCLAIMS ALL WARRANTIES,
91 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
92 * PARTICULAR PURPOSE. IN NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL,
93 * DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER ARISING
94 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE, EVEN
95 * IF IBM IS APPRISED OF THE POSSIBILITY OF SUCH DAMAGES.
96 */
97
98 #include <sys/cdefs.h>
99 #if defined(LIBC_SCCS) && !defined(lint)
100 #ifdef notdef
101 static const char sccsid[] = "@(#)res_debug.c 8.1 (Berkeley) 6/4/93";
102 static const char rcsid[] = "Id: res_debug.c,v 1.19 2009/02/26 11:20:20 tbox Exp";
103 #else
104 __RCSID("$NetBSD: res_debug.c,v 1.11 2009/04/12 17:07:17 christos Exp $");
105 #endif
106 #endif /* LIBC_SCCS and not lint */
107
108 #include "port_before.h"
109
110 #include "namespace.h"
111 #include <sys/types.h>
112 #include <sys/param.h>
113 #include <sys/socket.h>
114
115 #include <netinet/in.h>
116 #include <arpa/inet.h>
117 #include <arpa/nameser.h>
118
119 #include <ctype.h>
120 #include <errno.h>
121 #include <math.h>
122 #include <netdb.h>
123 #include <resolv.h>
124 #include <resolv_mt.h>
125 #include <stdio.h>
126 #include <stdlib.h>
127 #include <string.h>
128 #include <time.h>
129
130 #include "port_after.h"
131
132 #ifdef SPRINTF_CHAR
133 # define SPRINTF(x) strlen(sprintf/**/x)
134 #else
135 # define SPRINTF(x) sprintf x
136 #endif
137
138 extern const char *_res_opcodes[];
139 extern const char *_res_sectioncodes[];
140
141 #if 0
142 #ifdef __weak_alias
143 __weak_alias(res_pquery,__res_pquery)
144 __weak_alias(res_nametoclass,__res_nametoclass)
145 __weak_alias(res_nametotype,__res_nametotype)
146 #endif
147 #endif
148
149 #ifndef _LIBC
150 /*%
151 * Print the current options.
152 */
153 void
154 fp_resstat(const res_state statp, FILE *file) {
155 u_long mask;
156
157 fprintf(file, ";; res options:");
158 for (mask = 1; mask != 0U; mask <<= 1)
159 if (statp->options & mask)
160 fprintf(file, " %s", p_option(mask));
161 putc('\n', file);
162 }
163 #endif
164
165 static void
166 do_section(const res_state statp,
167 ns_msg *handle, ns_sect section,
168 int pflag, FILE *file)
169 {
170 int n, sflag, rrnum;
171 static int buflen = 2048;
172 char *buf;
173 ns_opcode opcode;
174 ns_rr rr;
175
176 /*
177 * Print answer records.
178 */
179 sflag = (statp->pfcode & pflag);
180 if (statp->pfcode && !sflag)
181 return;
182
183 buf = malloc((size_t)buflen);
184 if (buf == NULL) {
185 fprintf(file, ";; memory allocation failure\n");
186 return;
187 }
188
189 opcode = (ns_opcode) ns_msg_getflag(*handle, ns_f_opcode);
190 rrnum = 0;
191 for (;;) {
192 if (ns_parserr(handle, section, rrnum, &rr)) {
193 if (errno != ENODEV)
194 fprintf(file, ";; ns_parserr: %s\n",
195 strerror(errno));
196 else if (rrnum > 0 && sflag != 0 &&
197 (statp->pfcode & RES_PRF_HEAD1))
198 putc('\n', file);
199 goto cleanup;
200 }
201 if (rrnum == 0 && sflag != 0 && (statp->pfcode & RES_PRF_HEAD1))
202 fprintf(file, ";; %s SECTION:\n",
203 p_section(section, opcode));
204 if (section == ns_s_qd)
205 fprintf(file, ";;\t%s, type = %s, class = %s\n",
206 ns_rr_name(rr),
207 p_type(ns_rr_type(rr)),
208 p_class(ns_rr_class(rr)));
209 else if (section == ns_s_ar && ns_rr_type(rr) == ns_t_opt) {
210 u_int16_t optcode, optlen, rdatalen = ns_rr_rdlen(rr);
211 u_int32_t ttl = ns_rr_ttl(rr);
212
213 fprintf(file,
214 "; EDNS: version: %u, udp=%u, flags=%04x\n",
215 (ttl>>16)&0xff, ns_rr_class(rr), ttl&0xffff);
216
217 while (rdatalen >= 4) {
218 const u_char *cp = ns_rr_rdata(rr);
219 int i;
220
221 GETSHORT(optcode, cp);
222 GETSHORT(optlen, cp);
223
224 if (optcode == NS_OPT_NSID) {
225 fputs("; NSID: ", file);
226 if (optlen == 0) {
227 fputs("; NSID\n", file);
228 } else {
229 fputs("; NSID: ", file);
230 for (i = 0; i < optlen; i++)
231 fprintf(file, "%02x ",
232 cp[i]);
233 fputs(" (",file);
234 for (i = 0; i < optlen; i++)
235 fprintf(file, "%c",
236 isprint(cp[i])?
237 cp[i] : '.');
238 fputs(")\n", file);
239 }
240 } else {
241 if (optlen == 0) {
242 fprintf(file, "; OPT=%u\n",
243 optcode);
244 } else {
245 fprintf(file, "; OPT=%u: ",
246 optcode);
247 for (i = 0; i < optlen; i++)
248 fprintf(file, "%02x ",
249 cp[i]);
250 fputs(" (",file);
251 for (i = 0; i < optlen; i++)
252 fprintf(file, "%c",
253 isprint(cp[i]) ?
254 cp[i] : '.');
255 fputs(")\n", file);
256 }
257 }
258 rdatalen -= 4 + optlen;
259 }
260 } else {
261 n = ns_sprintrr(handle, &rr, NULL, NULL,
262 buf, (u_int)buflen);
263 if (n < 0) {
264 if (errno == ENOSPC) {
265 free(buf);
266 buf = NULL;
267 if (buflen < 131072)
268 buf = malloc((size_t)(buflen += 1024));
269 if (buf == NULL) {
270 fprintf(file,
271 ";; memory allocation failure\n");
272 return;
273 }
274 continue;
275 }
276 fprintf(file, ";; ns_sprintrr: %s\n",
277 strerror(errno));
278 goto cleanup;
279 }
280 fputs(buf, file);
281 fputc('\n', file);
282 }
283 rrnum++;
284 }
285 cleanup:
286 if (buf != NULL)
287 free(buf);
288 }
289
290 /*%
291 * Print the contents of a query.
292 * This is intended to be primarily a debugging routine.
293 */
294 void
295 res_pquery(const res_state statp, const u_char *msg, int len, FILE *file) {
296 ns_msg handle;
297 int qdcount, ancount, nscount, arcount;
298 u_int opcode, rcode, id;
299
300 if (ns_initparse(msg, len, &handle) < 0) {
301 fprintf(file, ";; ns_initparse: %s\n", strerror(errno));
302 return;
303 }
304 opcode = ns_msg_getflag(handle, ns_f_opcode);
305 rcode = ns_msg_getflag(handle, ns_f_rcode);
306 id = ns_msg_id(handle);
307 qdcount = ns_msg_count(handle, ns_s_qd);
308 ancount = ns_msg_count(handle, ns_s_an);
309 nscount = ns_msg_count(handle, ns_s_ns);
310 arcount = ns_msg_count(handle, ns_s_ar);
311
312 /*
313 * Print header fields.
314 */
315 if ((!statp->pfcode) || (statp->pfcode & RES_PRF_HEADX) || rcode)
316 fprintf(file,
317 ";; ->>HEADER<<- opcode: %s, status: %s, id: %d\n",
318 _res_opcodes[opcode], p_rcode((int)rcode), id);
319 if ((!statp->pfcode) || (statp->pfcode & RES_PRF_HEADX))
320 putc(';', file);
321 if ((!statp->pfcode) || (statp->pfcode & RES_PRF_HEAD2)) {
322 fprintf(file, "; flags:");
323 if (ns_msg_getflag(handle, ns_f_qr))
324 fprintf(file, " qr");
325 if (ns_msg_getflag(handle, ns_f_aa))
326 fprintf(file, " aa");
327 if (ns_msg_getflag(handle, ns_f_tc))
328 fprintf(file, " tc");
329 if (ns_msg_getflag(handle, ns_f_rd))
330 fprintf(file, " rd");
331 if (ns_msg_getflag(handle, ns_f_ra))
332 fprintf(file, " ra");
333 if (ns_msg_getflag(handle, ns_f_z))
334 fprintf(file, " ??");
335 if (ns_msg_getflag(handle, ns_f_ad))
336 fprintf(file, " ad");
337 if (ns_msg_getflag(handle, ns_f_cd))
338 fprintf(file, " cd");
339 }
340 if ((!statp->pfcode) || (statp->pfcode & RES_PRF_HEAD1)) {
341 fprintf(file, "; %s: %d",
342 p_section(ns_s_qd, (int)opcode), qdcount);
343 fprintf(file, ", %s: %d",
344 p_section(ns_s_an, (int)opcode), ancount);
345 fprintf(file, ", %s: %d",
346 p_section(ns_s_ns, (int)opcode), nscount);
347 fprintf(file, ", %s: %d",
348 p_section(ns_s_ar, (int)opcode), arcount);
349 }
350 if ((!statp->pfcode) || (statp->pfcode &
351 (RES_PRF_HEADX | RES_PRF_HEAD2 | RES_PRF_HEAD1))) {
352 putc('\n',file);
353 }
354 /*
355 * Print the various sections.
356 */
357 do_section(statp, &handle, ns_s_qd, RES_PRF_QUES, file);
358 do_section(statp, &handle, ns_s_an, RES_PRF_ANS, file);
359 do_section(statp, &handle, ns_s_ns, RES_PRF_AUTH, file);
360 do_section(statp, &handle, ns_s_ar, RES_PRF_ADD, file);
361 if (qdcount == 0 && ancount == 0 &&
362 nscount == 0 && arcount == 0)
363 putc('\n', file);
364 }
365
366 const u_char *
367 p_cdnname(const u_char *cp, const u_char *msg, int len, FILE *file) {
368 char name[MAXDNAME];
369 int n;
370
371 if ((n = dn_expand(msg, msg + len, cp, name, sizeof name)) < 0)
372 return (NULL);
373 if (name[0] == '\0')
374 putc('.', file);
375 else
376 fputs(name, file);
377 return (cp + n);
378 }
379
380 const u_char *
381 p_cdname(const u_char *cp, const u_char *msg, FILE *file) {
382 return (p_cdnname(cp, msg, PACKETSZ, file));
383 }
384
385 /*%
386 * Return a fully-qualified domain name from a compressed name (with
387 length supplied). */
388
389 const u_char *
390 p_fqnname(cp, msg, msglen, name, namelen)
391 const u_char *cp, *msg;
392 int msglen;
393 char *name;
394 int namelen;
395 {
396 int n, newlen;
397
398 if ((n = dn_expand(msg, cp + msglen, cp, name, namelen)) < 0)
399 return (NULL);
400 newlen = strlen(name);
401 if (newlen == 0 || name[newlen - 1] != '.') {
402 if (newlen + 1 >= namelen) /*%< Lack space for final dot */
403 return (NULL);
404 else
405 strcpy(name + newlen, ".");
406 }
407 return (cp + n);
408 }
409
410 /* XXX: the rest of these functions need to become length-limited, too. */
411
412 const u_char *
413 p_fqname(const u_char *cp, const u_char *msg, FILE *file) {
414 char name[MAXDNAME];
415 const u_char *n;
416
417 n = p_fqnname(cp, msg, MAXCDNAME, name, sizeof name);
418 if (n == NULL)
419 return (NULL);
420 fputs(name, file);
421 return (n);
422 }
423
424 /*%
425 * Names of RR classes and qclasses. Classes and qclasses are the same, except
426 * that C_ANY is a qclass but not a class. (You can ask for records of class
427 * C_ANY, but you can't have any records of that class in the database.)
428 */
429 const struct res_sym __p_class_syms[] = {
430 {C_IN, "IN", (char *)0},
431 {C_CHAOS, "CH", (char *)0},
432 {C_CHAOS, "CHAOS", (char *)0},
433 {C_HS, "HS", (char *)0},
434 {C_HS, "HESIOD", (char *)0},
435 {C_ANY, "ANY", (char *)0},
436 {C_NONE, "NONE", (char *)0},
437 {C_IN, (char *)0, (char *)0}
438 };
439
440 /*%
441 * Names of message sections.
442 */
443 const struct res_sym __p_default_section_syms[] = {
444 {ns_s_qd, "QUERY", (char *)0},
445 {ns_s_an, "ANSWER", (char *)0},
446 {ns_s_ns, "AUTHORITY", (char *)0},
447 {ns_s_ar, "ADDITIONAL", (char *)0},
448 {0, (char *)0, (char *)0}
449 };
450
451 const struct res_sym __p_update_section_syms[] = {
452 {S_ZONE, "ZONE", (char *)0},
453 {S_PREREQ, "PREREQUISITE", (char *)0},
454 {S_UPDATE, "UPDATE", (char *)0},
455 {S_ADDT, "ADDITIONAL", (char *)0},
456 {0, (char *)0, (char *)0}
457 };
458
459 const struct res_sym __p_key_syms[] = {
460 {NS_ALG_MD5RSA, "RSA", "RSA KEY with MD5 hash"},
461 {NS_ALG_DH, "DH", "Diffie Hellman"},
462 {NS_ALG_DSA, "DSA", "Digital Signature Algorithm"},
463 {NS_ALG_EXPIRE_ONLY, "EXPIREONLY", "No algorithm"},
464 {NS_ALG_PRIVATE_OID, "PRIVATE", "Algorithm obtained from OID"},
465 {0, NULL, NULL}
466 };
467
468 const struct res_sym __p_cert_syms[] = {
469 {cert_t_pkix, "PKIX", "PKIX (X.509v3) Certificate"},
470 {cert_t_spki, "SPKI", "SPKI certificate"},
471 {cert_t_pgp, "PGP", "PGP certificate"},
472 {cert_t_url, "URL", "URL Private"},
473 {cert_t_oid, "OID", "OID Private"},
474 {0, NULL, NULL}
475 };
476
477 /*%
478 * Names of RR types and qtypes. Types and qtypes are the same, except
479 * that T_ANY is a qtype but not a type. (You can ask for records of type
480 * T_ANY, but you can't have any records of that type in the database.)
481 */
482 const struct res_sym __p_type_syms[] = {
483 {ns_t_a, "A", "address"},
484 {ns_t_ns, "NS", "name server"},
485 {ns_t_md, "MD", "mail destination (deprecated)"},
486 {ns_t_mf, "MF", "mail forwarder (deprecated)"},
487 {ns_t_cname, "CNAME", "canonical name"},
488 {ns_t_soa, "SOA", "start of authority"},
489 {ns_t_mb, "MB", "mailbox"},
490 {ns_t_mg, "MG", "mail group member"},
491 {ns_t_mr, "MR", "mail rename"},
492 {ns_t_null, "NULL", "null"},
493 {ns_t_wks, "WKS", "well-known service (deprecated)"},
494 {ns_t_ptr, "PTR", "domain name pointer"},
495 {ns_t_hinfo, "HINFO", "host information"},
496 {ns_t_minfo, "MINFO", "mailbox information"},
497 {ns_t_mx, "MX", "mail exchanger"},
498 {ns_t_txt, "TXT", "text"},
499 {ns_t_rp, "RP", "responsible person"},
500 {ns_t_afsdb, "AFSDB", "DCE or AFS server"},
501 {ns_t_x25, "X25", "X25 address"},
502 {ns_t_isdn, "ISDN", "ISDN address"},
503 {ns_t_rt, "RT", "router"},
504 {ns_t_nsap, "NSAP", "nsap address"},
505 {ns_t_nsap_ptr, "NSAP_PTR", "domain name pointer"},
506 {ns_t_sig, "SIG", "signature"},
507 {ns_t_key, "KEY", "key"},
508 {ns_t_px, "PX", "mapping information"},
509 {ns_t_gpos, "GPOS", "geographical position (withdrawn)"},
510 {ns_t_aaaa, "AAAA", "IPv6 address"},
511 {ns_t_loc, "LOC", "location"},
512 {ns_t_nxt, "NXT", "next valid name (unimplemented)"},
513 {ns_t_eid, "EID", "endpoint identifier (unimplemented)"},
514 {ns_t_nimloc, "NIMLOC", "NIMROD locator (unimplemented)"},
515 {ns_t_srv, "SRV", "server selection"},
516 {ns_t_atma, "ATMA", "ATM address (unimplemented)"},
517 {ns_t_naptr, "NAPTR", "naptr"},
518 {ns_t_kx, "KX", "key exchange"},
519 {ns_t_cert, "CERT", "certificate"},
520 {ns_t_a6, "A", "IPv6 address (experminental)"},
521 {ns_t_dname, "DNAME", "non-terminal redirection"},
522 {ns_t_opt, "OPT", "opt"},
523 {ns_t_apl, "apl", "apl"},
524 {ns_t_ds, "DS", "delegation signer"},
525 {ns_t_sshfp, "SSFP", "SSH fingerprint"},
526 {ns_t_ipseckey, "IPSECKEY", "IPSEC key"},
527 {ns_t_rrsig, "RRSIG", "rrsig"},
528 {ns_t_nsec, "NSEC", "nsec"},
529 {ns_t_dnskey, "DNSKEY", "DNS key"},
530 {ns_t_dhcid, "DHCID", "dynamic host configuration identifier"},
531 {ns_t_nsec3, "NSEC3", "nsec3"},
532 {ns_t_nsec3param, "NSEC3PARAM", "NSEC3 parameters"},
533 {ns_t_hip, "HIP", "host identity protocol"},
534 {ns_t_spf, "SPF", "sender policy framework"},
535 {ns_t_tkey, "TKEY", "tkey"},
536 {ns_t_tsig, "TSIG", "transaction signature"},
537 {ns_t_ixfr, "IXFR", "incremental zone transfer"},
538 {ns_t_axfr, "AXFR", "zone transfer"},
539 {ns_t_zxfr, "ZXFR", "compressed zone transfer"},
540 {ns_t_mailb, "MAILB", "mailbox-related data (deprecated)"},
541 {ns_t_maila, "MAILA", "mail agent (deprecated)"},
542 {ns_t_naptr, "NAPTR", "URN Naming Authority"},
543 {ns_t_kx, "KX", "Key Exchange"},
544 {ns_t_cert, "CERT", "Certificate"},
545 {ns_t_a6, "A6", "IPv6 Address"},
546 {ns_t_dname, "DNAME", "dname"},
547 {ns_t_sink, "SINK", "Kitchen Sink (experimental)"},
548 {ns_t_opt, "OPT", "EDNS Options"},
549 {ns_t_any, "ANY", "\"any\""},
550 {ns_t_dlv, "DLV", "DNSSEC look-aside validation"},
551 {0, NULL, NULL}
552 };
553
554 /*%
555 * Names of DNS rcodes.
556 */
557 const struct res_sym __p_rcode_syms[] = {
558 {ns_r_noerror, "NOERROR", "no error"},
559 {ns_r_formerr, "FORMERR", "format error"},
560 {ns_r_servfail, "SERVFAIL", "server failed"},
561 {ns_r_nxdomain, "NXDOMAIN", "no such domain name"},
562 {ns_r_notimpl, "NOTIMP", "not implemented"},
563 {ns_r_refused, "REFUSED", "refused"},
564 {ns_r_yxdomain, "YXDOMAIN", "domain name exists"},
565 {ns_r_yxrrset, "YXRRSET", "rrset exists"},
566 {ns_r_nxrrset, "NXRRSET", "rrset doesn't exist"},
567 {ns_r_notauth, "NOTAUTH", "not authoritative"},
568 {ns_r_notzone, "NOTZONE", "Not in zone"},
569 {ns_r_max, "", ""},
570 {ns_r_badsig, "BADSIG", "bad signature"},
571 {ns_r_badkey, "BADKEY", "bad key"},
572 {ns_r_badtime, "BADTIME", "bad time"},
573 {0, NULL, NULL}
574 };
575
576 int
577 sym_ston(const struct res_sym *syms, const char *name, int *success) {
578 for (; syms->name != 0; syms++) {
579 if (strcasecmp (name, syms->name) == 0) {
580 if (success)
581 *success = 1;
582 return (syms->number);
583 }
584 }
585 if (success)
586 *success = 0;
587 return (syms->number); /*%< The default value. */
588 }
589
590 const char *
591 sym_ntos(const struct res_sym *syms, int number, int *success) {
592 char *unname = sym_ntos_unname;
593
594 for (; syms->name != 0; syms++) {
595 if (number == syms->number) {
596 if (success)
597 *success = 1;
598 return (syms->name);
599 }
600 }
601
602 sprintf(unname, "%d", number); /*%< XXX nonreentrant */
603 if (success)
604 *success = 0;
605 return (unname);
606 }
607
608 const char *
609 sym_ntop(const struct res_sym *syms, int number, int *success) {
610 char *unname = sym_ntop_unname;
611
612 for (; syms->name != 0; syms++) {
613 if (number == syms->number) {
614 if (success)
615 *success = 1;
616 return (syms->humanname);
617 }
618 }
619 sprintf(unname, "%d", number); /*%< XXX nonreentrant */
620 if (success)
621 *success = 0;
622 return (unname);
623 }
624
625 /*%
626 * Return a string for the type.
627 */
628 const char *
629 p_type(int type) {
630 int success;
631 const char *result;
632 static char typebuf[20];
633
634 result = sym_ntos(__p_type_syms, type, &success);
635 if (success)
636 return (result);
637 if (type < 0 || type > 0xffff)
638 return ("BADTYPE");
639 sprintf(typebuf, "TYPE%d", type);
640 return (typebuf);
641 }
642
643 /*%
644 * Return a string for the type.
645 */
646 const char *
647 p_section(int section, int opcode) {
648 const struct res_sym *symbols;
649
650 switch (opcode) {
651 case ns_o_update:
652 symbols = __p_update_section_syms;
653 break;
654 default:
655 symbols = __p_default_section_syms;
656 break;
657 }
658 return (sym_ntos(symbols, section, (int *)0));
659 }
660
661 /*%
662 * Return a mnemonic for class.
663 */
664 const char *
665 p_class(int class) {
666 int success;
667 const char *result;
668 static char classbuf[20];
669
670 result = sym_ntos(__p_class_syms, class, &success);
671 if (success)
672 return (result);
673 if (class < 0 || class > 0xffff)
674 return ("BADCLASS");
675 sprintf(classbuf, "CLASS%d", class);
676 return (classbuf);
677 }
678
679 /*%
680 * Return a mnemonic for an option
681 */
682 const char *
683 p_option(u_long option) {
684 char *nbuf = p_option_nbuf;
685
686 switch (option) {
687 case RES_INIT: return "init";
688 case RES_DEBUG: return "debug";
689 case RES_AAONLY: return "aaonly(unimpl)";
690 case RES_USEVC: return "usevc";
691 case RES_PRIMARY: return "primry(unimpl)";
692 case RES_IGNTC: return "igntc";
693 case RES_RECURSE: return "recurs";
694 case RES_DEFNAMES: return "defnam";
695 case RES_STAYOPEN: return "styopn";
696 case RES_DNSRCH: return "dnsrch";
697 case RES_INSECURE1: return "insecure1";
698 case RES_INSECURE2: return "insecure2";
699 case RES_NOALIASES: return "noaliases";
700 case RES_USE_INET6: return "inet6";
701 #ifdef RES_USE_EDNS0 /*%< KAME extension */
702 case RES_USE_EDNS0: return "edns0";
703 case RES_NSID: return "nsid";
704 #endif
705 #ifdef RES_USE_DNAME
706 case RES_USE_DNAME: return "dname";
707 #endif
708 #ifdef RES_USE_DNSSEC
709 case RES_USE_DNSSEC: return "dnssec";
710 #endif
711 #ifdef RES_NOTLDQUERY
712 case RES_NOTLDQUERY: return "no-tld-query";
713 #endif
714 #ifdef RES_NO_NIBBLE2
715 case RES_NO_NIBBLE2: return "no-nibble2";
716 #endif
717 /* XXX nonreentrant */
718 default: sprintf(nbuf, "?0x%lx?", (u_long)option);
719 return (nbuf);
720 }
721 }
722
723 /*%
724 * Return a mnemonic for a time to live.
725 */
726 const char *
727 p_time(u_int32_t value) {
728 char *nbuf = p_time_nbuf;
729
730 if (ns_format_ttl((u_long)value, nbuf, sizeof nbuf) < 0)
731 sprintf(nbuf, "%u", value);
732 return (nbuf);
733 }
734
735 /*%
736 * Return a string for the rcode.
737 */
738 const char *
739 p_rcode(int rcode) {
740 return (sym_ntos(__p_rcode_syms, rcode, (int *)0));
741 }
742
743 /*%
744 * Return a string for a res_sockaddr_union.
745 */
746 const char *
747 p_sockun(union res_sockaddr_union u, char *buf, size_t size) {
748 char ret[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:123.123.123.123"];
749
750 switch (u.sin.sin_family) {
751 case AF_INET:
752 inet_ntop(AF_INET, &u.sin.sin_addr, ret, sizeof ret);
753 break;
754 #ifdef HAS_INET6_STRUCTS
755 case AF_INET6:
756 inet_ntop(AF_INET6, &u.sin6.sin6_addr, ret, sizeof ret);
757 break;
758 #endif
759 default:
760 sprintf(ret, "[af%d]", u.sin.sin_family);
761 break;
762 }
763 if (size > 0U) {
764 strncpy(buf, ret, size - 1);
765 buf[size - 1] = '0';
766 }
767 return (buf);
768 }
769
770 /*%
771 * routines to convert between on-the-wire RR format and zone file format.
772 * Does not contain conversion to/from decimal degrees; divide or multiply
773 * by 60*60*1000 for that.
774 */
775
776 static unsigned int poweroften[10] = {1, 10, 100, 1000, 10000, 100000,
777 1000000,10000000,100000000,1000000000};
778
779 /*% takes an XeY precision/size value, returns a string representation. */
780 static const char *
781 precsize_ntoa(u_int32_t prec)
782 {
783 char *retbuf = precsize_ntoa_retbuf;
784 unsigned long val;
785 int mantissa, exponent;
786
787 mantissa = (int)((prec >> 4) & 0x0f) % 10;
788 exponent = (int)((prec >> 0) & 0x0f) % 10;
789
790 val = mantissa * poweroften[exponent];
791
792 (void) sprintf(retbuf, "%lu.%.2lu", val/100, val%100);
793 return (retbuf);
794 }
795
796 /*% converts ascii size/precision X * 10**Y(cm) to 0xXY. moves pointer. */
797 static u_int8_t
798 precsize_aton(const char **strptr) {
799 unsigned int mval = 0, cmval = 0;
800 u_int8_t retval = 0;
801 const char *cp;
802 int exponent;
803 int mantissa;
804
805 cp = *strptr;
806
807 while (isdigit((unsigned char)*cp))
808 mval = mval * 10 + (*cp++ - '0');
809
810 if (*cp == '.') { /*%< centimeters */
811 cp++;
812 if (isdigit((unsigned char)*cp)) {
813 cmval = (*cp++ - '0') * 10;
814 if (isdigit((unsigned char)*cp)) {
815 cmval += (*cp++ - '0');
816 }
817 }
818 }
819 cmval = (mval * 100) + cmval;
820
821 for (exponent = 0; exponent < 9; exponent++)
822 if (cmval < poweroften[exponent+1])
823 break;
824
825 mantissa = cmval / poweroften[exponent];
826 if (mantissa > 9)
827 mantissa = 9;
828
829 retval = (mantissa << 4) | exponent;
830
831 *strptr = cp;
832
833 return (retval);
834 }
835
836 /*% converts ascii lat/lon to unsigned encoded 32-bit number. moves pointer. */
837 static u_int32_t
838 latlon2ul(const char **latlonstrptr, int *which) {
839 const char *cp;
840 u_int32_t retval;
841 int deg = 0, min = 0, secs = 0, secsfrac = 0;
842
843 cp = *latlonstrptr;
844
845 while (isdigit((unsigned char)*cp))
846 deg = deg * 10 + (*cp++ - '0');
847
848 while (isspace((unsigned char)*cp))
849 cp++;
850
851 if (!(isdigit((unsigned char)*cp)))
852 goto fndhemi;
853
854 while (isdigit((unsigned char)*cp))
855 min = min * 10 + (*cp++ - '0');
856
857 while (isspace((unsigned char)*cp))
858 cp++;
859
860 if (!(isdigit((unsigned char)*cp)))
861 goto fndhemi;
862
863 while (isdigit((unsigned char)*cp))
864 secs = secs * 10 + (*cp++ - '0');
865
866 if (*cp == '.') { /*%< decimal seconds */
867 cp++;
868 if (isdigit((unsigned char)*cp)) {
869 secsfrac = (*cp++ - '0') * 100;
870 if (isdigit((unsigned char)*cp)) {
871 secsfrac += (*cp++ - '0') * 10;
872 if (isdigit((unsigned char)*cp)) {
873 secsfrac += (*cp++ - '0');
874 }
875 }
876 }
877 }
878
879 while (!isspace((unsigned char)*cp)) /*%< if any trailing garbage */
880 cp++;
881
882 while (isspace((unsigned char)*cp))
883 cp++;
884
885 fndhemi:
886 switch (*cp) {
887 case 'N': case 'n':
888 case 'E': case 'e':
889 retval = ((unsigned)1<<31)
890 + (((((deg * 60) + min) * 60) + secs) * 1000)
891 + secsfrac;
892 break;
893 case 'S': case 's':
894 case 'W': case 'w':
895 retval = ((unsigned)1<<31)
896 - (((((deg * 60) + min) * 60) + secs) * 1000)
897 - secsfrac;
898 break;
899 default:
900 retval = 0; /*%< invalid value -- indicates error */
901 break;
902 }
903
904 switch (*cp) {
905 case 'N': case 'n':
906 case 'S': case 's':
907 *which = 1; /*%< latitude */
908 break;
909 case 'E': case 'e':
910 case 'W': case 'w':
911 *which = 2; /*%< longitude */
912 break;
913 default:
914 *which = 0; /*%< error */
915 break;
916 }
917
918 cp++; /*%< skip the hemisphere */
919 while (!isspace((unsigned char)*cp)) /*%< if any trailing garbage */
920 cp++;
921
922 while (isspace((unsigned char)*cp)) /*%< move to next field */
923 cp++;
924
925 *latlonstrptr = cp;
926
927 return (retval);
928 }
929
930 /*%
931 * converts a zone file representation in a string to an RDATA on-the-wire
932 * representation. */
933 int
934 loc_aton(ascii, binary)
935 const char *ascii;
936 u_char *binary;
937 {
938 const char *cp, *maxcp;
939 u_char *bcp;
940
941 u_int32_t latit = 0, longit = 0, alt = 0;
942 u_int32_t lltemp1 = 0, lltemp2 = 0;
943 int altmeters = 0, altfrac = 0, altsign = 1;
944 u_int8_t hp = 0x16; /*%< default = 1e6 cm = 10000.00m = 10km */
945 u_int8_t vp = 0x13; /*%< default = 1e3 cm = 10.00m */
946 u_int8_t siz = 0x12; /*%< default = 1e2 cm = 1.00m */
947 int which1 = 0, which2 = 0;
948
949 cp = ascii;
950 maxcp = cp + strlen(ascii);
951
952 lltemp1 = latlon2ul(&cp, &which1);
953
954 lltemp2 = latlon2ul(&cp, &which2);
955
956 switch (which1 + which2) {
957 case 3: /*%< 1 + 2, the only valid combination */
958 if ((which1 == 1) && (which2 == 2)) { /*%< normal case */
959 latit = lltemp1;
960 longit = lltemp2;
961 } else if ((which1 == 2) && (which2 == 1)) { /*%< reversed */
962 longit = lltemp1;
963 latit = lltemp2;
964 } else { /*%< some kind of brokenness */
965 return (0);
966 }
967 break;
968 default: /*%< we didn't get one of each */
969 return (0);
970 }
971
972 /* altitude */
973 if (*cp == '-') {
974 altsign = -1;
975 cp++;
976 }
977
978 if (*cp == '+')
979 cp++;
980
981 while (isdigit((unsigned char)*cp))
982 altmeters = altmeters * 10 + (*cp++ - '0');
983
984 if (*cp == '.') { /*%< decimal meters */
985 cp++;
986 if (isdigit((unsigned char)*cp)) {
987 altfrac = (*cp++ - '0') * 10;
988 if (isdigit((unsigned char)*cp)) {
989 altfrac += (*cp++ - '0');
990 }
991 }
992 }
993
994 alt = (10000000 + (altsign * (altmeters * 100 + altfrac)));
995
996 while (!isspace((unsigned char)*cp) && (cp < maxcp)) /*%< if trailing garbage or m */
997 cp++;
998
999 while (isspace((unsigned char)*cp) && (cp < maxcp))
1000 cp++;
1001
1002 if (cp >= maxcp)
1003 goto defaults;
1004
1005 siz = precsize_aton(&cp);
1006
1007 while (!isspace((unsigned char)*cp) && (cp < maxcp)) /*%< if trailing garbage or m */
1008 cp++;
1009
1010 while (isspace((unsigned char)*cp) && (cp < maxcp))
1011 cp++;
1012
1013 if (cp >= maxcp)
1014 goto defaults;
1015
1016 hp = precsize_aton(&cp);
1017
1018 while (!isspace((unsigned char)*cp) && (cp < maxcp)) /*%< if trailing garbage or m */
1019 cp++;
1020
1021 while (isspace((unsigned char)*cp) && (cp < maxcp))
1022 cp++;
1023
1024 if (cp >= maxcp)
1025 goto defaults;
1026
1027 vp = precsize_aton(&cp);
1028
1029 defaults:
1030
1031 bcp = binary;
1032 *bcp++ = (u_int8_t) 0; /*%< version byte */
1033 *bcp++ = siz;
1034 *bcp++ = hp;
1035 *bcp++ = vp;
1036 PUTLONG(latit,bcp);
1037 PUTLONG(longit,bcp);
1038 PUTLONG(alt,bcp);
1039
1040 return (16); /*%< size of RR in octets */
1041 }
1042
1043 /*% takes an on-the-wire LOC RR and formats it in a human readable format. */
1044 const char *
1045 loc_ntoa(binary, ascii)
1046 const u_char *binary;
1047 char *ascii;
1048 {
1049 static const char *error = "?";
1050 static char tmpbuf[sizeof
1051 "1000 60 60.000 N 1000 60 60.000 W -12345678.00m 90000000.00m 90000000.00m 90000000.00m"];
1052 const u_char *cp = binary;
1053
1054 int latdeg, latmin, latsec, latsecfrac;
1055 int longdeg, longmin, longsec, longsecfrac;
1056 char northsouth, eastwest;
1057 const char *altsign;
1058 int altmeters, altfrac;
1059
1060 const u_int32_t referencealt = 100000 * 100;
1061
1062 int32_t latval, longval, altval;
1063 u_int32_t templ;
1064 u_int8_t sizeval, hpval, vpval, versionval;
1065
1066 char *sizestr, *hpstr, *vpstr;
1067
1068 versionval = *cp++;
1069
1070 if (ascii == NULL)
1071 ascii = tmpbuf;
1072
1073 if (versionval) {
1074 (void) sprintf(ascii, "; error: unknown LOC RR version");
1075 return (ascii);
1076 }
1077
1078 sizeval = *cp++;
1079
1080 hpval = *cp++;
1081 vpval = *cp++;
1082
1083 GETLONG(templ, cp);
1084 latval = (templ - ((unsigned)1<<31));
1085
1086 GETLONG(templ, cp);
1087 longval = (templ - ((unsigned)1<<31));
1088
1089 GETLONG(templ, cp);
1090 if (templ < referencealt) { /*%< below WGS 84 spheroid */
1091 altval = referencealt - templ;
1092 altsign = "-";
1093 } else {
1094 altval = templ - referencealt;
1095 altsign = "";
1096 }
1097
1098 if (latval < 0) {
1099 northsouth = 'S';
1100 latval = -latval;
1101 } else
1102 northsouth = 'N';
1103
1104 latsecfrac = latval % 1000;
1105 latval = latval / 1000;
1106 latsec = latval % 60;
1107 latval = latval / 60;
1108 latmin = latval % 60;
1109 latval = latval / 60;
1110 latdeg = latval;
1111
1112 if (longval < 0) {
1113 eastwest = 'W';
1114 longval = -longval;
1115 } else
1116 eastwest = 'E';
1117
1118 longsecfrac = longval % 1000;
1119 longval = longval / 1000;
1120 longsec = longval % 60;
1121 longval = longval / 60;
1122 longmin = longval % 60;
1123 longval = longval / 60;
1124 longdeg = longval;
1125
1126 altfrac = altval % 100;
1127 altmeters = (altval / 100);
1128
1129 sizestr = strdup(precsize_ntoa((u_int32_t)sizeval));
1130 hpstr = strdup(precsize_ntoa((u_int32_t)hpval));
1131 vpstr = strdup(precsize_ntoa((u_int32_t)vpval));
1132
1133 sprintf(ascii,
1134 "%d %.2d %.2d.%.3d %c %d %.2d %.2d.%.3d %c %s%d.%.2dm %sm %sm %sm",
1135 latdeg, latmin, latsec, latsecfrac, northsouth,
1136 longdeg, longmin, longsec, longsecfrac, eastwest,
1137 altsign, altmeters, altfrac,
1138 (sizestr != NULL) ? sizestr : error,
1139 (hpstr != NULL) ? hpstr : error,
1140 (vpstr != NULL) ? vpstr : error);
1141
1142 if (sizestr != NULL)
1143 free(sizestr);
1144 if (hpstr != NULL)
1145 free(hpstr);
1146 if (vpstr != NULL)
1147 free(vpstr);
1148
1149 return (ascii);
1150 }
1151
1152
1153 /*% Return the number of DNS hierarchy levels in the name. */
1154 int
1155 dn_count_labels(const char *name) {
1156 int i, len, count;
1157
1158 len = strlen(name);
1159 for (i = 0, count = 0; i < len; i++) {
1160 /* XXX need to check for \. or use named's nlabels(). */
1161 if (name[i] == '.')
1162 count++;
1163 }
1164
1165 /* don't count initial wildcard */
1166 if (name[0] == '*')
1167 if (count)
1168 count--;
1169
1170 /* don't count the null label for root. */
1171 /* if terminating '.' not found, must adjust */
1172 /* count to include last label */
1173 if (len > 0 && name[len-1] != '.')
1174 count++;
1175 return (count);
1176 }
1177
1178 /*%
1179 * Make dates expressed in seconds-since-Jan-1-1970 easy to read.
1180 * SIG records are required to be printed like this, by the Secure DNS RFC.
1181 */
1182 char *
1183 p_secstodate (u_long secs) {
1184 /* XXX nonreentrant */
1185 char *output = p_secstodate_output;
1186 time_t myclock = secs;
1187 struct tm *mytime;
1188 #ifdef HAVE_TIME_R
1189 struct tm res;
1190
1191 mytime = gmtime_r(&myclock, &res);
1192 #else
1193 mytime = gmtime(&myclock);
1194 #endif
1195 mytime->tm_year += 1900;
1196 mytime->tm_mon += 1;
1197 sprintf(output, "%04d%02d%02d%02d%02d%02d",
1198 mytime->tm_year, mytime->tm_mon, mytime->tm_mday,
1199 mytime->tm_hour, mytime->tm_min, mytime->tm_sec);
1200 return (output);
1201 }
1202
1203 u_int16_t
1204 res_nametoclass(const char *buf, int *successp) {
1205 unsigned long result;
1206 char *endptr;
1207 int success;
1208
1209 result = sym_ston(__p_class_syms, buf, &success);
1210 if (success)
1211 goto done;
1212
1213 if (strncasecmp(buf, "CLASS", 5) != 0 ||
1214 !isdigit((unsigned char)buf[5]))
1215 goto done;
1216 errno = 0;
1217 result = strtoul(buf + 5, &endptr, 10);
1218 if (errno == 0 && *endptr == '\0' && result <= 0xffffU)
1219 success = 1;
1220 done:
1221 if (successp)
1222 *successp = success;
1223 return (u_int16_t)(result);
1224 }
1225
1226 u_int16_t
1227 res_nametotype(const char *buf, int *successp) {
1228 unsigned long result;
1229 char *endptr;
1230 int success;
1231
1232 result = sym_ston(__p_type_syms, buf, &success);
1233 if (success)
1234 goto done;
1235
1236 if (strncasecmp(buf, "type", 4) != 0 ||
1237 !isdigit((unsigned char)buf[4]))
1238 goto done;
1239 errno = 0;
1240 result = strtoul(buf + 4, &endptr, 10);
1241 if (errno == 0 && *endptr == '\0' && result <= 0xffffU)
1242 success = 1;
1243 done:
1244 if (successp)
1245 *successp = success;
1246 return (u_int16_t)(result);
1247 }
1248
1249 /*! \file */
MINIX 3 (repo.or.cz mirror)