1 /* $NetBSD: res_debug.c,v 1.14 2015/02/24 17:56:20 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. Neither the name of the University nor the names of its contributors
33 * may be used to endorse or promote products derived from this software
34 * without specific prior written permission.
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
37 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
39 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
40 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
41 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
42 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
44 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
45 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 */
48
49 /*
50 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
51 *
52 * Permission to use, copy, modify, and distribute this software for any
53 * purpose with or without fee is hereby granted, provided that the above
54 * copyright notice and this permission notice appear in all copies, and that
55 * the name of Digital Equipment Corporation not be used in advertising or
56 * publicity pertaining to distribution of the document or software without
57 * specific, written prior permission.
58 *
59 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
60 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
61 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
62 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
63 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
64 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
65 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
66 * SOFTWARE.
67 */
68
69 /*
70 * Portions Copyright (c) 1995 by International Business Machines, Inc.
71 *
72 * International Business Machines, Inc. (hereinafter called IBM) grants
73 * permission under its copyrights to use, copy, modify, and distribute this
74 * Software with or without fee, provided that the above copyright notice and
75 * all paragraphs of this notice appear in all copies, and that the name of IBM
76 * not be used in connection with the marketing of any product incorporating
77 * the Software or modifications thereof, without specific, written prior
78 * permission.
79 *
80 * To the extent it has a right to do so, IBM grants an immunity from suit
81 * under its patents, if any, for the use, sale or manufacture of products to
82 * the extent that such products are used for performing Domain Name System
83 * dynamic updates in TCP/IP networks by means of the Software. No immunity is
84 * granted for any product per se or for any other function of any product.
85 *
86 * THE SOFTWARE IS PROVIDED "AS IS", AND IBM DISCLAIMS ALL WARRANTIES,
87 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
88 * PARTICULAR PURPOSE. IN NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL,
89 * DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER ARISING
90 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE, EVEN
91 * IF IBM IS APPRISED OF THE POSSIBILITY OF SUCH DAMAGES.
92 */
93
94 #include <sys/cdefs.h>
95 #if defined(LIBC_SCCS) && !defined(lint)
96 #ifdef notdef
97 static const char sccsid[] = "@(#)res_debug.c 8.1 (Berkeley) 6/4/93";
98 static const char rcsid[] = "Id: res_debug.c,v 1.19 2009/02/26 11:20:20 tbox Exp";
99 #else
100 __RCSID("$NetBSD: res_debug.c,v 1.14 2015/02/24 17:56:20 christos Exp $");
101 #endif
102 #endif /* LIBC_SCCS and not lint */
103
104 #include "port_before.h"
105
106 #include "namespace.h"
107 #include <sys/types.h>
108 #include <sys/param.h>
109 #include <sys/socket.h>
110
111 #include <netinet/in.h>
112 #include <arpa/inet.h>
113 #include <arpa/nameser.h>
114
115 #include <assert.h>
116 #include <ctype.h>
117 #include <errno.h>
118 #include <math.h>
119 #include <netdb.h>
120 #include <resolv.h>
121 #include <resolv_mt.h>
122 #include <stdio.h>
123 #include <stdlib.h>
124 #include <string.h>
125 #include <time.h>
126
127 #include "port_after.h"
128
129 #ifdef SPRINTF_CHAR
130 # define SPRINTF(x) strlen(sprintf/**/x)
131 #else
132 # define SPRINTF(x) sprintf x
133 #endif
134
135 extern const char *_res_opcodes[];
136 extern const char *_res_sectioncodes[];
137
138 #if 0
139 #ifdef __weak_alias
140 __weak_alias(res_pquery,__res_pquery)
141 __weak_alias(res_nametoclass,__res_nametoclass)
142 __weak_alias(res_nametotype,__res_nametotype)
143 #endif
144 #endif
145
146 #ifndef _LIBC
147 /*%
148 * Print the current options.
149 */
150 void
fp_resstat(const res_state statp,FILE * file)151 fp_resstat(const res_state statp, FILE *file) {
152 u_long mask;
153
154 fprintf(file, ";; res options:");
155 for (mask = 1; mask != 0U; mask <<= 1)
156 if (statp->options & mask)
157 fprintf(file, " %s", p_option(mask));
158 putc('\n', file);
159 }
160 #endif
161
162 static void
do_section(const res_state statp,ns_msg * handle,ns_sect section,int pflag,FILE * file)163 do_section(const res_state statp,
164 ns_msg *handle, ns_sect section,
165 int pflag, FILE *file)
166 {
167 int n, sflag, rrnum;
168 static int buflen = 2048;
169 char *buf;
170 ns_opcode opcode;
171 ns_rr rr;
172
173 /*
174 * Print answer records.
175 */
176 sflag = (int)(statp->pfcode & pflag);
177 if (statp->pfcode && !sflag)
178 return;
179
180 buf = malloc((size_t)buflen);
181 if (buf == NULL) {
182 fprintf(file, ";; memory allocation failure\n");
183 return;
184 }
185
186 opcode = (ns_opcode) ns_msg_getflag(*handle, ns_f_opcode);
187 rrnum = 0;
188 for (;;) {
189 if (ns_parserr(handle, section, rrnum, &rr)) {
190 if (errno != ENODEV)
191 fprintf(file, ";; ns_parserr: %s\n",
192 strerror(errno));
193 else if (rrnum > 0 && sflag != 0 &&
194 (statp->pfcode & RES_PRF_HEAD1))
195 putc('\n', file);
196 goto cleanup;
197 }
198 if (rrnum == 0 && sflag != 0 && (statp->pfcode & RES_PRF_HEAD1))
199 fprintf(file, ";; %s SECTION:\n",
200 p_section(section, opcode));
201 if (section == ns_s_qd)
202 fprintf(file, ";;\t%s, type = %s, class = %s\n",
203 ns_rr_name(rr),
204 p_type(ns_rr_type(rr)),
205 p_class(ns_rr_class(rr)));
206 else if (section == ns_s_ar && ns_rr_type(rr) == ns_t_opt) {
207 size_t rdatalen, ttl;
208 uint16_t optcode, optlen;
209
210 rdatalen = ns_rr_rdlen(rr);
211 ttl = ns_rr_ttl(rr);
212
213 fprintf(file,
214 "; EDNS: version: %zu, udp=%u, flags=%04zx\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
res_pquery(const res_state statp,const u_char * msg,int len,FILE * file)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 *
p_cdnname(const u_char * cp,const u_char * msg,int len,FILE * file)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, (int)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 *
p_cdname(const u_char * cp,const u_char * msg,FILE * file)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 *
p_fqnname(const u_char * cp,const u_char * msg,int msglen,char * name,int namelen)390 p_fqnname(const u_char *cp, const u_char *msg, int msglen, char *name,
391 int namelen)
392 {
393 int n;
394 size_t newlen;
395
396 if ((n = dn_expand(msg, cp + msglen, cp, name, namelen)) < 0)
397 return (NULL);
398 newlen = strlen(name);
399 if (newlen == 0 || name[newlen - 1] != '.') {
400 if ((int)newlen + 1 >= namelen) /*%< Lack space for final dot */
401 return (NULL);
402 else
403 strcpy(name + newlen, ".");
404 }
405 return (cp + n);
406 }
407
408 /* XXX: the rest of these functions need to become length-limited, too. */
409
410 const u_char *
p_fqname(const u_char * cp,const u_char * msg,FILE * file)411 p_fqname(const u_char *cp, const u_char *msg, FILE *file) {
412 char name[MAXDNAME];
413 const u_char *n;
414
415 n = p_fqnname(cp, msg, MAXCDNAME, name, (int)sizeof name);
416 if (n == NULL)
417 return (NULL);
418 fputs(name, file);
419 return (n);
420 }
421
422 /*%
423 * Names of RR classes and qclasses. Classes and qclasses are the same, except
424 * that C_ANY is a qclass but not a class. (You can ask for records of class
425 * C_ANY, but you can't have any records of that class in the database.)
426 */
427 const struct res_sym __p_class_syms[] = {
428 {C_IN, "IN", (char *)0},
429 {C_CHAOS, "CH", (char *)0},
430 {C_CHAOS, "CHAOS", (char *)0},
431 {C_HS, "HS", (char *)0},
432 {C_HS, "HESIOD", (char *)0},
433 {C_ANY, "ANY", (char *)0},
434 {C_NONE, "NONE", (char *)0},
435 {C_IN, (char *)0, (char *)0}
436 };
437
438 /*%
439 * Names of message sections.
440 */
441 const struct res_sym __p_default_section_syms[] = {
442 {ns_s_qd, "QUERY", (char *)0},
443 {ns_s_an, "ANSWER", (char *)0},
444 {ns_s_ns, "AUTHORITY", (char *)0},
445 {ns_s_ar, "ADDITIONAL", (char *)0},
446 {0, (char *)0, (char *)0}
447 };
448
449 const struct res_sym __p_update_section_syms[] = {
450 {S_ZONE, "ZONE", (char *)0},
451 {S_PREREQ, "PREREQUISITE", (char *)0},
452 {S_UPDATE, "UPDATE", (char *)0},
453 {S_ADDT, "ADDITIONAL", (char *)0},
454 {0, (char *)0, (char *)0}
455 };
456
457 const struct res_sym __p_key_syms[] = {
458 {NS_ALG_MD5RSA, "RSA", "RSA KEY with MD5 hash"},
459 {NS_ALG_DH, "DH", "Diffie Hellman"},
460 {NS_ALG_DSA, "DSA", "Digital Signature Algorithm"},
461 {NS_ALG_EXPIRE_ONLY, "EXPIREONLY", "No algorithm"},
462 {NS_ALG_PRIVATE_OID, "PRIVATE", "Algorithm obtained from OID"},
463 {0, NULL, NULL}
464 };
465
466 const struct res_sym __p_cert_syms[] = {
467 {cert_t_pkix, "PKIX", "PKIX (X.509v3) Certificate"},
468 {cert_t_spki, "SPKI", "SPKI certificate"},
469 {cert_t_pgp, "PGP", "PGP certificate"},
470 {cert_t_url, "URL", "URL Private"},
471 {cert_t_oid, "OID", "OID Private"},
472 {0, NULL, NULL}
473 };
474
475 /*%
476 * Names of RR types and qtypes. Types and qtypes are the same, except
477 * that T_ANY is a qtype but not a type. (You can ask for records of type
478 * T_ANY, but you can't have any records of that type in the database.)
479 */
480 const struct res_sym __p_type_syms[] = {
481 {ns_t_a, "A", "address"},
482 {ns_t_ns, "NS", "name server"},
483 {ns_t_md, "MD", "mail destination (deprecated)"},
484 {ns_t_mf, "MF", "mail forwarder (deprecated)"},
485 {ns_t_cname, "CNAME", "canonical name"},
486 {ns_t_soa, "SOA", "start of authority"},
487 {ns_t_mb, "MB", "mailbox"},
488 {ns_t_mg, "MG", "mail group member"},
489 {ns_t_mr, "MR", "mail rename"},
490 {ns_t_null, "NULL", "null"},
491 {ns_t_wks, "WKS", "well-known service (deprecated)"},
492 {ns_t_ptr, "PTR", "domain name pointer"},
493 {ns_t_hinfo, "HINFO", "host information"},
494 {ns_t_minfo, "MINFO", "mailbox information"},
495 {ns_t_mx, "MX", "mail exchanger"},
496 {ns_t_txt, "TXT", "text"},
497 {ns_t_rp, "RP", "responsible person"},
498 {ns_t_afsdb, "AFSDB", "DCE or AFS server"},
499 {ns_t_x25, "X25", "X25 address"},
500 {ns_t_isdn, "ISDN", "ISDN address"},
501 {ns_t_rt, "RT", "router"},
502 {ns_t_nsap, "NSAP", "nsap address"},
503 {ns_t_nsap_ptr, "NSAP_PTR", "domain name pointer"},
504 {ns_t_sig, "SIG", "signature"},
505 {ns_t_key, "KEY", "key"},
506 {ns_t_px, "PX", "mapping information"},
507 {ns_t_gpos, "GPOS", "geographical position (withdrawn)"},
508 {ns_t_aaaa, "AAAA", "IPv6 address"},
509 {ns_t_loc, "LOC", "location"},
510 {ns_t_nxt, "NXT", "next valid name (unimplemented)"},
511 {ns_t_eid, "EID", "endpoint identifier (unimplemented)"},
512 {ns_t_nimloc, "NIMLOC", "NIMROD locator (unimplemented)"},
513 {ns_t_srv, "SRV", "server selection"},
514 {ns_t_atma, "ATMA", "ATM address (unimplemented)"},
515 {ns_t_naptr, "NAPTR", "naptr"},
516 {ns_t_kx, "KX", "key exchange"},
517 {ns_t_cert, "CERT", "certificate"},
518 {ns_t_a6, "A", "IPv6 address (experminental)"},
519 {ns_t_dname, "DNAME", "non-terminal redirection"},
520 {ns_t_opt, "OPT", "opt"},
521 {ns_t_apl, "apl", "apl"},
522 {ns_t_ds, "DS", "delegation signer"},
523 {ns_t_sshfp, "SSFP", "SSH fingerprint"},
524 {ns_t_ipseckey, "IPSECKEY", "IPSEC key"},
525 {ns_t_rrsig, "RRSIG", "rrsig"},
526 {ns_t_nsec, "NSEC", "nsec"},
527 {ns_t_dnskey, "DNSKEY", "DNS key"},
528 {ns_t_dhcid, "DHCID", "dynamic host configuration identifier"},
529 {ns_t_nsec3, "NSEC3", "nsec3"},
530 {ns_t_nsec3param, "NSEC3PARAM", "NSEC3 parameters"},
531 {ns_t_hip, "HIP", "host identity protocol"},
532 {ns_t_spf, "SPF", "sender policy framework"},
533 {ns_t_tkey, "TKEY", "tkey"},
534 {ns_t_tsig, "TSIG", "transaction signature"},
535 {ns_t_ixfr, "IXFR", "incremental zone transfer"},
536 {ns_t_axfr, "AXFR", "zone transfer"},
537 {ns_t_zxfr, "ZXFR", "compressed zone transfer"},
538 {ns_t_mailb, "MAILB", "mailbox-related data (deprecated)"},
539 {ns_t_maila, "MAILA", "mail agent (deprecated)"},
540 {ns_t_naptr, "NAPTR", "URN Naming Authority"},
541 {ns_t_kx, "KX", "Key Exchange"},
542 {ns_t_cert, "CERT", "Certificate"},
543 {ns_t_a6, "A6", "IPv6 Address"},
544 {ns_t_dname, "DNAME", "dname"},
545 {ns_t_sink, "SINK", "Kitchen Sink (experimental)"},
546 {ns_t_opt, "OPT", "EDNS Options"},
547 {ns_t_any, "ANY", "\"any\""},
548 {ns_t_dlv, "DLV", "DNSSEC look-aside validation"},
549 {0, NULL, NULL}
550 };
551
552 /*%
553 * Names of DNS rcodes.
554 */
555 const struct res_sym __p_rcode_syms[] = {
556 {ns_r_noerror, "NOERROR", "no error"},
557 {ns_r_formerr, "FORMERR", "format error"},
558 {ns_r_servfail, "SERVFAIL", "server failed"},
559 {ns_r_nxdomain, "NXDOMAIN", "no such domain name"},
560 {ns_r_notimpl, "NOTIMP", "not implemented"},
561 {ns_r_refused, "REFUSED", "refused"},
562 {ns_r_yxdomain, "YXDOMAIN", "domain name exists"},
563 {ns_r_yxrrset, "YXRRSET", "rrset exists"},
564 {ns_r_nxrrset, "NXRRSET", "rrset doesn't exist"},
565 {ns_r_notauth, "NOTAUTH", "not authoritative"},
566 {ns_r_notzone, "NOTZONE", "Not in zone"},
567 {ns_r_max, "", ""},
568 {ns_r_badsig, "BADSIG", "bad signature"},
569 {ns_r_badkey, "BADKEY", "bad key"},
570 {ns_r_badtime, "BADTIME", "bad time"},
571 {0, NULL, NULL}
572 };
573
574 int
sym_ston(const struct res_sym * syms,const char * name,int * success)575 sym_ston(const struct res_sym *syms, const char *name, int *success) {
576 for (; syms->name != 0; syms++) {
577 if (strcasecmp (name, syms->name) == 0) {
578 if (success)
579 *success = 1;
580 return (syms->number);
581 }
582 }
583 if (success)
584 *success = 0;
585 return (syms->number); /*%< The default value. */
586 }
587
588 const char *
sym_ntos(const struct res_sym * syms,int number,int * success)589 sym_ntos(const struct res_sym *syms, int number, int *success) {
590 char *unname = sym_ntos_unname;
591
592 for (; syms->name != 0; syms++) {
593 if (number == syms->number) {
594 if (success)
595 *success = 1;
596 return (syms->name);
597 }
598 }
599
600 sprintf(unname, "%d", number); /*%< XXX nonreentrant */
601 if (success)
602 *success = 0;
603 return (unname);
604 }
605
606 const char *
sym_ntop(const struct res_sym * syms,int number,int * success)607 sym_ntop(const struct res_sym *syms, int number, int *success) {
608 char *unname = sym_ntop_unname;
609
610 for (; syms->name != 0; syms++) {
611 if (number == syms->number) {
612 if (success)
613 *success = 1;
614 return (syms->humanname);
615 }
616 }
617 sprintf(unname, "%d", number); /*%< XXX nonreentrant */
618 if (success)
619 *success = 0;
620 return (unname);
621 }
622
623 /*%
624 * Return a string for the type.
625 */
626 const char *
p_type(int type)627 p_type(int type) {
628 int success;
629 const char *result;
630 static char typebuf[20];
631
632 result = sym_ntos(__p_type_syms, type, &success);
633 if (success)
634 return (result);
635 if (type < 0 || type > 0xffff)
636 return ("BADTYPE");
637 sprintf(typebuf, "TYPE%d", type);
638 return (typebuf);
639 }
640
641 /*%
642 * Return a string for the type.
643 */
644 const char *
p_section(int section,int opcode)645 p_section(int section, int opcode) {
646 const struct res_sym *symbols;
647
648 switch (opcode) {
649 case ns_o_update:
650 symbols = __p_update_section_syms;
651 break;
652 default:
653 symbols = __p_default_section_syms;
654 break;
655 }
656 return (sym_ntos(symbols, section, (int *)0));
657 }
658
659 /*%
660 * Return a mnemonic for class.
661 */
662 const char *
p_class(int class)663 p_class(int class) {
664 int success;
665 const char *result;
666 static char classbuf[20];
667
668 result = sym_ntos(__p_class_syms, class, &success);
669 if (success)
670 return (result);
671 if (class < 0 || class > 0xffff)
672 return ("BADCLASS");
673 sprintf(classbuf, "CLASS%d", class);
674 return (classbuf);
675 }
676
677 /*%
678 * Return a mnemonic for an option
679 */
680 const char *
p_option(u_long option)681 p_option(u_long option) {
682 char *nbuf = p_option_nbuf;
683
684 switch (option) {
685 case RES_INIT: return "init";
686 case RES_DEBUG: return "debug";
687 case RES_AAONLY: return "aaonly(unimpl)";
688 case RES_USEVC: return "usevc";
689 case RES_PRIMARY: return "primry(unimpl)";
690 case RES_IGNTC: return "igntc";
691 case RES_RECURSE: return "recurs";
692 case RES_DEFNAMES: return "defnam";
693 case RES_STAYOPEN: return "styopn";
694 case RES_DNSRCH: return "dnsrch";
695 case RES_INSECURE1: return "insecure1";
696 case RES_INSECURE2: return "insecure2";
697 case RES_NOALIASES: return "noaliases";
698 case RES_USE_INET6: return "inet6";
699 #ifdef RES_USE_EDNS0 /*%< KAME extension */
700 case RES_USE_EDNS0: return "edns0";
701 case RES_NSID: return "nsid";
702 #endif
703 #ifdef RES_USE_DNAME
704 case RES_USE_DNAME: return "dname";
705 #endif
706 #ifdef RES_USE_DNSSEC
707 case RES_USE_DNSSEC: return "dnssec";
708 #endif
709 #ifdef RES_NOTLDQUERY
710 case RES_NOTLDQUERY: return "no-tld-query";
711 #endif
712 #ifdef RES_NO_NIBBLE2
713 case RES_NO_NIBBLE2: return "no-nibble2";
714 #endif
715 /* XXX nonreentrant */
716 default: sprintf(nbuf, "?0x%lx?", (u_long)option);
717 return (nbuf);
718 }
719 }
720
721 /*%
722 * Return a mnemonic for a time to live.
723 */
724 const char *
p_time(u_int32_t value)725 p_time(u_int32_t value) {
726 char *nbuf = p_time_nbuf;
727
728 if (ns_format_ttl((u_long)value, nbuf, sizeof nbuf) < 0)
729 sprintf(nbuf, "%u", value);
730 return (nbuf);
731 }
732
733 /*%
734 * Return a string for the rcode.
735 */
736 const char *
p_rcode(int rcode)737 p_rcode(int rcode) {
738 return (sym_ntos(__p_rcode_syms, rcode, (int *)0));
739 }
740
741 /*%
742 * Return a string for a res_sockaddr_union.
743 */
744 const char *
p_sockun(union res_sockaddr_union u,char * buf,size_t size)745 p_sockun(union res_sockaddr_union u, char *buf, size_t size) {
746 char ret[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:123.123.123.123"];
747
748 switch (u.sin.sin_family) {
749 case AF_INET:
750 inet_ntop(AF_INET, &u.sin.sin_addr, ret, (socklen_t)sizeof ret);
751 break;
752 #ifdef HAS_INET6_STRUCTS
753 case AF_INET6:
754 inet_ntop(AF_INET6, &u.sin6.sin6_addr, ret, sizeof ret);
755 break;
756 #endif
757 default:
758 sprintf(ret, "[af%d]", u.sin.sin_family);
759 break;
760 }
761 if (size > 0U) {
762 strncpy(buf, ret, size - 1);
763 buf[size - 1] = '0';
764 }
765 return (buf);
766 }
767
768 /*%
769 * routines to convert between on-the-wire RR format and zone file format.
770 * Does not contain conversion to/from decimal degrees; divide or multiply
771 * by 60*60*1000 for that.
772 */
773
774 static unsigned int poweroften[10] = {1, 10, 100, 1000, 10000, 100000,
775 1000000,10000000,100000000,1000000000};
776
777 /*% takes an XeY precision/size value, returns a string representation. */
778 static const char *
precsize_ntoa(u_int32_t prec)779 precsize_ntoa(u_int32_t prec)
780 {
781 char *retbuf = precsize_ntoa_retbuf;
782 unsigned long val;
783 int mantissa, exponent;
784
785 mantissa = (int)((prec >> 4) & 0x0f) % 10;
786 exponent = (int)((prec >> 0) & 0x0f) % 10;
787
788 val = mantissa * poweroften[exponent];
789
790 (void) sprintf(retbuf, "%lu.%.2lu", val/100, val%100);
791 return (retbuf);
792 }
793
794 /*% converts ascii size/precision X * 10**Y(cm) to 0xXY. moves pointer. */
795 static u_int8_t
precsize_aton(const char ** strptr)796 precsize_aton(const char **strptr) {
797 unsigned int mval = 0, cmval = 0;
798 u_int8_t retval = 0;
799 const char *cp;
800 int exponent;
801 int mantissa;
802
803 cp = *strptr;
804
805 while (isdigit((unsigned char)*cp))
806 mval = mval * 10 + (*cp++ - '0');
807
808 if (*cp == '.') { /*%< centimeters */
809 cp++;
810 if (isdigit((unsigned char)*cp)) {
811 cmval = (*cp++ - '0') * 10;
812 if (isdigit((unsigned char)*cp)) {
813 cmval += (*cp++ - '0');
814 }
815 }
816 }
817 cmval = (mval * 100) + cmval;
818
819 for (exponent = 0; exponent < 9; exponent++)
820 if (cmval < poweroften[exponent+1])
821 break;
822
823 mantissa = cmval / poweroften[exponent];
824 if (mantissa > 9)
825 mantissa = 9;
826
827 retval = (mantissa << 4) | exponent;
828
829 *strptr = cp;
830
831 return (retval);
832 }
833
834 /*% converts ascii lat/lon to unsigned encoded 32-bit number. moves pointer. */
835 static u_int32_t
latlon2ul(const char ** latlonstrptr,int * which)836 latlon2ul(const char **latlonstrptr, int *which) {
837 const char *cp;
838 u_int32_t retval;
839 int deg = 0, min = 0, secs = 0, secsfrac = 0;
840
841 cp = *latlonstrptr;
842
843 while (isdigit((unsigned char)*cp))
844 deg = deg * 10 + (*cp++ - '0');
845
846 while (isspace((unsigned char)*cp))
847 cp++;
848
849 if (!(isdigit((unsigned char)*cp)))
850 goto fndhemi;
851
852 while (isdigit((unsigned char)*cp))
853 min = min * 10 + (*cp++ - '0');
854
855 while (isspace((unsigned char)*cp))
856 cp++;
857
858 if (!(isdigit((unsigned char)*cp)))
859 goto fndhemi;
860
861 while (isdigit((unsigned char)*cp))
862 secs = secs * 10 + (*cp++ - '0');
863
864 if (*cp == '.') { /*%< decimal seconds */
865 cp++;
866 if (isdigit((unsigned char)*cp)) {
867 secsfrac = (*cp++ - '0') * 100;
868 if (isdigit((unsigned char)*cp)) {
869 secsfrac += (*cp++ - '0') * 10;
870 if (isdigit((unsigned char)*cp)) {
871 secsfrac += (*cp++ - '0');
872 }
873 }
874 }
875 }
876
877 while (!isspace((unsigned char)*cp)) /*%< if any trailing garbage */
878 cp++;
879
880 while (isspace((unsigned char)*cp))
881 cp++;
882
883 fndhemi:
884 switch (*cp) {
885 case 'N': case 'n':
886 case 'E': case 'e':
887 retval = ((unsigned)1<<31)
888 + (((((deg * 60) + min) * 60) + secs) * 1000)
889 + secsfrac;
890 break;
891 case 'S': case 's':
892 case 'W': case 'w':
893 retval = ((unsigned)1<<31)
894 - (((((deg * 60) + min) * 60) + secs) * 1000)
895 - secsfrac;
896 break;
897 default:
898 retval = 0; /*%< invalid value -- indicates error */
899 break;
900 }
901
902 switch (*cp) {
903 case 'N': case 'n':
904 case 'S': case 's':
905 *which = 1; /*%< latitude */
906 break;
907 case 'E': case 'e':
908 case 'W': case 'w':
909 *which = 2; /*%< longitude */
910 break;
911 default:
912 *which = 0; /*%< error */
913 break;
914 }
915
916 cp++; /*%< skip the hemisphere */
917 while (!isspace((unsigned char)*cp)) /*%< if any trailing garbage */
918 cp++;
919
920 while (isspace((unsigned char)*cp)) /*%< move to next field */
921 cp++;
922
923 *latlonstrptr = cp;
924
925 return (retval);
926 }
927
928 /*%
929 * converts a zone file representation in a string to an RDATA on-the-wire
930 * representation. */
931 int
loc_aton(const char * ascii,u_char * binary)932 loc_aton(const char *ascii, u_char *binary)
933 {
934 const char *cp, *maxcp;
935 u_char *bcp;
936
937 u_int32_t latit = 0, longit = 0, alt = 0;
938 u_int32_t lltemp1 = 0, lltemp2 = 0;
939 int altmeters = 0, altfrac = 0, altsign = 1;
940 u_int8_t hp = 0x16; /*%< default = 1e6 cm = 10000.00m = 10km */
941 u_int8_t vp = 0x13; /*%< default = 1e3 cm = 10.00m */
942 u_int8_t siz = 0x12; /*%< default = 1e2 cm = 1.00m */
943 int which1 = 0, which2 = 0;
944
945 cp = ascii;
946 maxcp = cp + strlen(ascii);
947
948 lltemp1 = latlon2ul(&cp, &which1);
949
950 lltemp2 = latlon2ul(&cp, &which2);
951
952 switch (which1 + which2) {
953 case 3: /*%< 1 + 2, the only valid combination */
954 if ((which1 == 1) && (which2 == 2)) { /*%< normal case */
955 latit = lltemp1;
956 longit = lltemp2;
957 } else if ((which1 == 2) && (which2 == 1)) { /*%< reversed */
958 longit = lltemp1;
959 latit = lltemp2;
960 } else { /*%< some kind of brokenness */
961 return (0);
962 }
963 break;
964 default: /*%< we didn't get one of each */
965 return (0);
966 }
967
968 /* altitude */
969 if (*cp == '-') {
970 altsign = -1;
971 cp++;
972 }
973
974 if (*cp == '+')
975 cp++;
976
977 while (isdigit((unsigned char)*cp))
978 altmeters = altmeters * 10 + (*cp++ - '0');
979
980 if (*cp == '.') { /*%< decimal meters */
981 cp++;
982 if (isdigit((unsigned char)*cp)) {
983 altfrac = (*cp++ - '0') * 10;
984 if (isdigit((unsigned char)*cp)) {
985 altfrac += (*cp++ - '0');
986 }
987 }
988 }
989
990 alt = (10000000 + (altsign * (altmeters * 100 + altfrac)));
991
992 while (!isspace((unsigned char)*cp) && (cp < maxcp)) /*%< if trailing garbage or m */
993 cp++;
994
995 while (isspace((unsigned char)*cp) && (cp < maxcp))
996 cp++;
997
998 if (cp >= maxcp)
999 goto defaults;
1000
1001 siz = precsize_aton(&cp);
1002
1003 while (!isspace((unsigned char)*cp) && (cp < maxcp)) /*%< if trailing garbage or m */
1004 cp++;
1005
1006 while (isspace((unsigned char)*cp) && (cp < maxcp))
1007 cp++;
1008
1009 if (cp >= maxcp)
1010 goto defaults;
1011
1012 hp = precsize_aton(&cp);
1013
1014 while (!isspace((unsigned char)*cp) && (cp < maxcp)) /*%< if trailing garbage or m */
1015 cp++;
1016
1017 while (isspace((unsigned char)*cp) && (cp < maxcp))
1018 cp++;
1019
1020 if (cp >= maxcp)
1021 goto defaults;
1022
1023 vp = precsize_aton(&cp);
1024
1025 defaults:
1026
1027 bcp = binary;
1028 *bcp++ = (u_int8_t) 0; /*%< version byte */
1029 *bcp++ = siz;
1030 *bcp++ = hp;
1031 *bcp++ = vp;
1032 PUTLONG(latit,bcp);
1033 PUTLONG(longit,bcp);
1034 PUTLONG(alt,bcp);
1035
1036 return (16); /*%< size of RR in octets */
1037 }
1038
1039 /*% takes an on-the-wire LOC RR and formats it in a human readable format. */
1040 const char *
loc_ntoa(const u_char * binary,char * ascii)1041 loc_ntoa(const u_char *binary, char *ascii)
1042 {
1043 static const char *error = "?";
1044 static char tmpbuf[sizeof
1045 "1000 60 60.000 N 1000 60 60.000 W -12345678.00m 90000000.00m 90000000.00m 90000000.00m"];
1046 const u_char *cp = binary;
1047
1048 int latdeg, latmin, latsec, latsecfrac;
1049 int longdeg, longmin, longsec, longsecfrac;
1050 char northsouth, eastwest;
1051 const char *altsign;
1052 int altmeters, altfrac;
1053
1054 const u_int32_t referencealt = 100000 * 100;
1055
1056 int32_t latval, longval, altval;
1057 u_int32_t templ;
1058 u_int8_t sizeval, hpval, vpval, versionval;
1059
1060 char *sizestr, *hpstr, *vpstr;
1061
1062 versionval = *cp++;
1063
1064 if (ascii == NULL)
1065 ascii = tmpbuf;
1066
1067 if (versionval) {
1068 (void) sprintf(ascii, "; error: unknown LOC RR version");
1069 return (ascii);
1070 }
1071
1072 sizeval = *cp++;
1073
1074 hpval = *cp++;
1075 vpval = *cp++;
1076
1077 GETLONG(templ, cp);
1078 latval = (templ - ((unsigned)1<<31));
1079
1080 GETLONG(templ, cp);
1081 longval = (templ - ((unsigned)1<<31));
1082
1083 GETLONG(templ, cp);
1084 if (templ < referencealt) { /*%< below WGS 84 spheroid */
1085 altval = referencealt - templ;
1086 altsign = "-";
1087 } else {
1088 altval = templ - referencealt;
1089 altsign = "";
1090 }
1091
1092 if (latval < 0) {
1093 northsouth = 'S';
1094 latval = -latval;
1095 } else
1096 northsouth = 'N';
1097
1098 latsecfrac = latval % 1000;
1099 latval = latval / 1000;
1100 latsec = latval % 60;
1101 latval = latval / 60;
1102 latmin = latval % 60;
1103 latval = latval / 60;
1104 latdeg = latval;
1105
1106 if (longval < 0) {
1107 eastwest = 'W';
1108 longval = -longval;
1109 } else
1110 eastwest = 'E';
1111
1112 longsecfrac = longval % 1000;
1113 longval = longval / 1000;
1114 longsec = longval % 60;
1115 longval = longval / 60;
1116 longmin = longval % 60;
1117 longval = longval / 60;
1118 longdeg = longval;
1119
1120 altfrac = altval % 100;
1121 altmeters = (altval / 100);
1122
1123 sizestr = strdup(precsize_ntoa((u_int32_t)sizeval));
1124 hpstr = strdup(precsize_ntoa((u_int32_t)hpval));
1125 vpstr = strdup(precsize_ntoa((u_int32_t)vpval));
1126
1127 sprintf(ascii,
1128 "%d %.2d %.2d.%.3d %c %d %.2d %.2d.%.3d %c %s%d.%.2dm %sm %sm %sm",
1129 latdeg, latmin, latsec, latsecfrac, northsouth,
1130 longdeg, longmin, longsec, longsecfrac, eastwest,
1131 altsign, altmeters, altfrac,
1132 (sizestr != NULL) ? sizestr : error,
1133 (hpstr != NULL) ? hpstr : error,
1134 (vpstr != NULL) ? vpstr : error);
1135
1136 if (sizestr != NULL)
1137 free(sizestr);
1138 if (hpstr != NULL)
1139 free(hpstr);
1140 if (vpstr != NULL)
1141 free(vpstr);
1142
1143 return (ascii);
1144 }
1145
1146
1147 /*% Return the number of DNS hierarchy levels in the name. */
1148 int
dn_count_labels(const char * name)1149 dn_count_labels(const char *name) {
1150 size_t len, i, count;
1151
1152 len = strlen(name);
1153 for (i = 0, count = 0; i < len; i++) {
1154 /* XXX need to check for \. or use named's nlabels(). */
1155 if (name[i] == '.')
1156 count++;
1157 }
1158
1159 /* don't count initial wildcard */
1160 if (name[0] == '*')
1161 if (count)
1162 count--;
1163
1164 /* don't count the null label for root. */
1165 /* if terminating '.' not found, must adjust */
1166 /* count to include last label */
1167 if (len > 0 && name[len-1] != '.')
1168 count++;
1169 _DIAGASSERT(__type_fit(int, count));
1170 return (int)count;
1171 }
1172
1173 /*%
1174 * Make dates expressed in seconds-since-Jan-1-1970 easy to read.
1175 * SIG records are required to be printed like this, by the Secure DNS RFC.
1176 */
1177 char *
p_secstodate(u_long secs)1178 p_secstodate (u_long secs) {
1179 /* XXX nonreentrant */
1180 char *output = p_secstodate_output;
1181 time_t myclock = secs;
1182 struct tm *mytime;
1183 #ifdef HAVE_TIME_R
1184 struct tm res;
1185
1186 mytime = gmtime_r(&myclock, &res);
1187 #else
1188 mytime = gmtime(&myclock);
1189 #endif
1190 mytime->tm_year += 1900;
1191 mytime->tm_mon += 1;
1192 sprintf(output, "%04d%02d%02d%02d%02d%02d",
1193 mytime->tm_year, mytime->tm_mon, mytime->tm_mday,
1194 mytime->tm_hour, mytime->tm_min, mytime->tm_sec);
1195 return (output);
1196 }
1197
1198 u_int16_t
res_nametoclass(const char * buf,int * successp)1199 res_nametoclass(const char *buf, int *successp) {
1200 unsigned long result;
1201 char *endptr;
1202 int success;
1203
1204 result = sym_ston(__p_class_syms, buf, &success);
1205 if (success)
1206 goto done;
1207
1208 if (strncasecmp(buf, "CLASS", 5) != 0 ||
1209 !isdigit((unsigned char)buf[5]))
1210 goto done;
1211 errno = 0;
1212 result = strtoul(buf + 5, &endptr, 10);
1213 if (errno == 0 && *endptr == '\0' && result <= 0xffffU)
1214 success = 1;
1215 done:
1216 if (successp)
1217 *successp = success;
1218 return (u_int16_t)(result);
1219 }
1220
1221 u_int16_t
res_nametotype(const char * buf,int * successp)1222 res_nametotype(const char *buf, int *successp) {
1223 unsigned long result;
1224 char *endptr;
1225 int success;
1226
1227 result = sym_ston(__p_type_syms, buf, &success);
1228 if (success)
1229 goto done;
1230
1231 if (strncasecmp(buf, "type", 4) != 0 ||
1232 !isdigit((unsigned char)buf[4]))
1233 goto done;
1234 errno = 0;
1235 result = strtoul(buf + 4, &endptr, 10);
1236 if (errno == 0 && *endptr == '\0' && result <= 0xffffU)
1237 success = 1;
1238 done:
1239 if (successp)
1240 *successp = success;
1241 return (u_int16_t)(result);
1242 }
1243
1244 /*! \file */
1245