1 /* $NetBSD: res_debug.c,v 1.13 2012/06/25 22:32:45 abs 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 1.13 2012/06/25 22:32:45 abs Exp $");
105 #endif
106 #endif /* LIBC_SCCS and not lint */
107
108
109
110 #include <sys/types.h>
111 #include <sys/param.h>
112 #include <sys/socket.h>
113
114 #include <netinet/in.h>
115 #include <arpa/inet.h>
116 #include <arpa/nameser.h>
117
118 #include <ctype.h>
119 #include <errno.h>
120 #include <math.h>
121 #include <netdb.h>
122 #include "resolv_private.h"
123 #include <stdio.h>
124 #include <stdlib.h>
125 #include <string.h>
126 #include <strings.h>
127 #include <time.h>
128
129 extern const char * const _res_sectioncodes[];
130
131 __LIBC_HIDDEN__ const char* const _res_opcodes[] = {
132 "QUERY",
133 "IQUERY",
134 "CQUERYM",
135 "CQUERYU", /* experimental */
136 "NOTIFY", /* experimental */
137 "UPDATE",
138 "6",
139 "7",
140 "8",
141 "9",
142 "10",
143 "11",
144 "12",
145 "13",
146 "ZONEINIT",
147 "ZONEREF",
148 };
149
150 #ifndef _LIBC
151 /*
152 * Print the current options.
153 */
154 void
fp_resstat(const res_state statp,FILE * file)155 fp_resstat(const res_state statp, FILE *file) {
156 u_long mask;
157
158 fprintf(file, ";; res options:");
159 for (mask = 1; mask != 0U; mask <<= 1)
160 if (statp->options & mask)
161 fprintf(file, " %s", p_option(mask));
162 putc('\n', file);
163 }
164 #endif
165
166 static void
do_section(const res_state statp,ns_msg * handle,ns_sect section,int pflag,FILE * file)167 do_section(const res_state statp,
168 ns_msg *handle, ns_sect section,
169 int pflag, FILE *file)
170 {
171 int n, sflag, rrnum;
172 int buflen = 2048;
173 char *buf;
174 ns_opcode opcode;
175 ns_rr rr;
176
177 /*
178 * Print answer records.
179 */
180 sflag = (int)(statp->pfcode & pflag);
181 if (statp->pfcode && !sflag)
182 return;
183
184 buf = malloc((size_t)buflen);
185 if (buf == NULL) {
186 fprintf(file, ";; memory allocation failure\n");
187 return;
188 }
189
190 opcode = (ns_opcode) ns_msg_getflag(*handle, ns_f_opcode);
191 rrnum = 0;
192 for (;;) {
193 if (ns_parserr(handle, section, rrnum, &rr)) {
194 if (errno != ENODEV)
195 fprintf(file, ";; ns_parserr: %s\n",
196 strerror(errno));
197 else if (rrnum > 0 && sflag != 0 &&
198 (statp->pfcode & RES_PRF_HEAD1))
199 putc('\n', file);
200 goto cleanup;
201 }
202 if (rrnum == 0 && sflag != 0 && (statp->pfcode & RES_PRF_HEAD1))
203 fprintf(file, ";; %s SECTION:\n",
204 p_section(section, opcode));
205 if (section == ns_s_qd)
206 fprintf(file, ";;\t%s, type = %s, class = %s\n",
207 ns_rr_name(rr),
208 p_type(ns_rr_type(rr)),
209 p_class(ns_rr_class(rr)));
210 else if (section == ns_s_ar && ns_rr_type(rr) == ns_t_opt) {
211 size_t rdatalen, ttl;
212 uint16_t optcode, optlen;
213
214 rdatalen = ns_rr_rdlen(rr);
215 ttl = ns_rr_ttl(rr);
216 fprintf(file,
217 "; EDNS: version: %zu, udp=%u, flags=%04zx\n",
218 (ttl>>16)&0xff, ns_rr_class(rr), ttl&0xffff);
219 while (rdatalen >= 4) {
220 const u_char *cp = ns_rr_rdata(rr);
221 int i;
222
223 GETSHORT(optcode, cp);
224 GETSHORT(optlen, cp);
225
226 if (optcode == NS_OPT_NSID) {
227 fputs("; NSID: ", file);
228 if (optlen == 0) {
229 fputs("; NSID\n", file);
230 } else {
231 fputs("; NSID: ", file);
232 for (i = 0; i < optlen; i++)
233 fprintf(file, "%02x ",
234 cp[i]);
235 fputs(" (",file);
236 for (i = 0; i < optlen; i++)
237 fprintf(file, "%c",
238 isprint(cp[i])?
239 cp[i] : '.');
240 fputs(")\n", file);
241 }
242 } else {
243 if (optlen == 0) {
244 fprintf(file, "; OPT=%u\n",
245 optcode);
246 } else {
247 fprintf(file, "; OPT=%u: ",
248 optcode);
249 for (i = 0; i < optlen; i++)
250 fprintf(file, "%02x ",
251 cp[i]);
252 fputs(" (",file);
253 for (i = 0; i < optlen; i++)
254 fprintf(file, "%c",
255 isprint(cp[i]) ?
256 cp[i] : '.');
257 fputs(")\n", file);
258 }
259 }
260 rdatalen -= 4 + optlen;
261 }
262 } else {
263 n = ns_sprintrr(handle, &rr, NULL, NULL,
264 buf, (u_int)buflen);
265 if (n < 0) {
266 if (errno == ENOSPC) {
267 free(buf);
268 buf = NULL;
269 if (buflen < 131072)
270 buf = malloc((size_t)(buflen += 1024));
271 if (buf == NULL) {
272 fprintf(file,
273 ";; memory allocation failure\n");
274 return;
275 }
276 continue;
277 }
278 fprintf(file, ";; ns_sprintrr: %s\n",
279 strerror(errno));
280 goto cleanup;
281 }
282 fputs(buf, file);
283 fputc('\n', file);
284 }
285 rrnum++;
286 }
287 cleanup:
288 if (buf != NULL)
289 free(buf);
290 }
291
292 /*
293 * Print the contents of a query.
294 * This is intended to be primarily a debugging routine.
295 */
296 void
res_pquery(const res_state statp,const u_char * msg,int len,FILE * file)297 res_pquery(const res_state statp, const u_char *msg, int len, FILE *file) {
298 ns_msg handle;
299 int qdcount, ancount, nscount, arcount;
300 u_int opcode, rcode, id;
301
302 if (ns_initparse(msg, len, &handle) < 0) {
303 fprintf(file, ";; ns_initparse: %s\n", strerror(errno));
304 return;
305 }
306 opcode = ns_msg_getflag(handle, ns_f_opcode);
307 rcode = ns_msg_getflag(handle, ns_f_rcode);
308 id = ns_msg_id(handle);
309 qdcount = ns_msg_count(handle, ns_s_qd);
310 ancount = ns_msg_count(handle, ns_s_an);
311 nscount = ns_msg_count(handle, ns_s_ns);
312 arcount = ns_msg_count(handle, ns_s_ar);
313
314 /*
315 * Print header fields.
316 */
317 if ((!statp->pfcode) || (statp->pfcode & RES_PRF_HEADX) || rcode)
318 fprintf(file,
319 ";; ->>HEADER<<- opcode: %s, status: %s, id: %d\n",
320 _res_opcodes[opcode], p_rcode((int)rcode), id);
321 if ((!statp->pfcode) || (statp->pfcode & RES_PRF_HEADX))
322 putc(';', file);
323 if ((!statp->pfcode) || (statp->pfcode & RES_PRF_HEAD2)) {
324 fprintf(file, "; flags:");
325 if (ns_msg_getflag(handle, ns_f_qr))
326 fprintf(file, " qr");
327 if (ns_msg_getflag(handle, ns_f_aa))
328 fprintf(file, " aa");
329 if (ns_msg_getflag(handle, ns_f_tc))
330 fprintf(file, " tc");
331 if (ns_msg_getflag(handle, ns_f_rd))
332 fprintf(file, " rd");
333 if (ns_msg_getflag(handle, ns_f_ra))
334 fprintf(file, " ra");
335 if (ns_msg_getflag(handle, ns_f_z))
336 fprintf(file, " ??");
337 if (ns_msg_getflag(handle, ns_f_ad))
338 fprintf(file, " ad");
339 if (ns_msg_getflag(handle, ns_f_cd))
340 fprintf(file, " cd");
341 }
342 if ((!statp->pfcode) || (statp->pfcode & RES_PRF_HEAD1)) {
343 fprintf(file, "; %s: %d",
344 p_section(ns_s_qd, (int)opcode), qdcount);
345 fprintf(file, ", %s: %d",
346 p_section(ns_s_an, (int)opcode), ancount);
347 fprintf(file, ", %s: %d",
348 p_section(ns_s_ns, (int)opcode), nscount);
349 fprintf(file, ", %s: %d",
350 p_section(ns_s_ar, (int)opcode), arcount);
351 }
352 if ((!statp->pfcode) || (statp->pfcode &
353 (RES_PRF_HEADX | RES_PRF_HEAD2 | RES_PRF_HEAD1))) {
354 putc('\n',file);
355 }
356 /*
357 * Print the various sections.
358 */
359 do_section(statp, &handle, ns_s_qd, RES_PRF_QUES, file);
360 do_section(statp, &handle, ns_s_an, RES_PRF_ANS, file);
361 do_section(statp, &handle, ns_s_ns, RES_PRF_AUTH, file);
362 do_section(statp, &handle, ns_s_ar, RES_PRF_ADD, file);
363 if (qdcount == 0 && ancount == 0 &&
364 nscount == 0 && arcount == 0)
365 putc('\n', file);
366 }
367
368 const u_char *
p_cdnname(const u_char * cp,const u_char * msg,int len,FILE * file)369 p_cdnname(const u_char *cp, const u_char *msg, int len, FILE *file) {
370 char name[MAXDNAME];
371 int n;
372
373 if ((n = dn_expand(msg, msg + len, cp, name, (int)sizeof name)) < 0)
374 return (NULL);
375 if (name[0] == '\0')
376 putc('.', file);
377 else
378 fputs(name, file);
379 return (cp + n);
380 }
381
382 const u_char *
p_cdname(const u_char * cp,const u_char * msg,FILE * file)383 p_cdname(const u_char *cp, const u_char *msg, FILE *file) {
384 return (p_cdnname(cp, msg, PACKETSZ, file));
385 }
386
387 /* Return a fully-qualified domain name from a compressed name (with
388 length supplied). */
389
390 const u_char *
p_fqnname(const u_char * cp,const u_char * msg,int msglen,char * name,int namelen)391 p_fqnname(const u_char *cp, const u_char *msg, int msglen, char *name,
392 int namelen)
393 {
394 int n;
395 size_t newlen;
396
397 if ((n = dn_expand(msg, cp + msglen, cp, name, namelen)) < 0)
398 return (NULL);
399 newlen = strlen(name);
400 if (newlen == 0 || name[newlen - 1] != '.') {
401 if ((int)newlen + 1 >= namelen) /* Lack space for final dot */
402 return (NULL);
403 else
404 strcpy(name + newlen, ".");
405 }
406 return (cp + n);
407 }
408
409 /* XXX: the rest of these functions need to become length-limited, too. */
410
411 const u_char *
p_fqname(const u_char * cp,const u_char * msg,FILE * file)412 p_fqname(const u_char *cp, const u_char *msg, FILE *file) {
413 char name[MAXDNAME];
414 const u_char *n;
415
416 n = p_fqnname(cp, msg, MAXCDNAME, name, (int)sizeof name);
417 if (n == NULL)
418 return (NULL);
419 fputs(name, file);
420 return (n);
421 }
422
423 /*
424 * Names of RR classes and qclasses. Classes and qclasses are the same, except
425 * that C_ANY is a qclass but not a class. (You can ask for records of class
426 * C_ANY, but you can't have any records of that class in the database.)
427 */
428 const struct res_sym __p_class_syms[] = {
429 {C_IN, "IN", (char *)0},
430 {C_CHAOS, "CH", (char *)0},
431 {C_CHAOS, "CHAOS", (char *)0},
432 {C_HS, "HS", (char *)0},
433 {C_HS, "HESIOD", (char *)0},
434 {C_ANY, "ANY", (char *)0},
435 {C_NONE, "NONE", (char *)0},
436 {C_IN, (char *)0, (char *)0}
437 };
438
439 /*
440 * Names of message sections.
441 */
442 static const struct res_sym __p_default_section_syms[] = {
443 {ns_s_qd, "QUERY", (char *)0},
444 {ns_s_an, "ANSWER", (char *)0},
445 {ns_s_ns, "AUTHORITY", (char *)0},
446 {ns_s_ar, "ADDITIONAL", (char *)0},
447 {0, (char *)0, (char *)0}
448 };
449
450 static const struct res_sym __p_update_section_syms[] = {
451 {S_ZONE, "ZONE", (char *)0},
452 {S_PREREQ, "PREREQUISITE", (char *)0},
453 {S_UPDATE, "UPDATE", (char *)0},
454 {S_ADDT, "ADDITIONAL", (char *)0},
455 {0, (char *)0, (char *)0}
456 };
457
458 const struct res_sym __p_key_syms[] = {
459 {NS_ALG_MD5RSA, "RSA", "RSA KEY with MD5 hash"},
460 {NS_ALG_DH, "DH", "Diffie Hellman"},
461 {NS_ALG_DSA, "DSA", "Digital Signature Algorithm"},
462 {NS_ALG_EXPIRE_ONLY, "EXPIREONLY", "No algorithm"},
463 {NS_ALG_PRIVATE_OID, "PRIVATE", "Algorithm obtained from OID"},
464 {0, NULL, NULL}
465 };
466
467 const struct res_sym __p_cert_syms[] = {
468 {cert_t_pkix, "PKIX", "PKIX (X.509v3) Certificate"},
469 {cert_t_spki, "SPKI", "SPKI certificate"},
470 {cert_t_pgp, "PGP", "PGP certificate"},
471 {cert_t_url, "URL", "URL Private"},
472 {cert_t_oid, "OID", "OID Private"},
473 {0, NULL, NULL}
474 };
475
476 /*
477 * Names of RR types and qtypes. Types and qtypes are the same, except
478 * that T_ANY is a qtype but not a type. (You can ask for records of type
479 * T_ANY, but you can't have any records of that type in the database.)
480 */
481 const struct res_sym __p_type_syms[] = {
482 {ns_t_a, "A", "address"},
483 {ns_t_ns, "NS", "name server"},
484 {ns_t_md, "MD", "mail destination (deprecated)"},
485 {ns_t_mf, "MF", "mail forwarder (deprecated)"},
486 {ns_t_cname, "CNAME", "canonical name"},
487 {ns_t_soa, "SOA", "start of authority"},
488 {ns_t_mb, "MB", "mailbox"},
489 {ns_t_mg, "MG", "mail group member"},
490 {ns_t_mr, "MR", "mail rename"},
491 {ns_t_null, "NULL", "null"},
492 {ns_t_wks, "WKS", "well-known service (deprecated)"},
493 {ns_t_ptr, "PTR", "domain name pointer"},
494 {ns_t_hinfo, "HINFO", "host information"},
495 {ns_t_minfo, "MINFO", "mailbox information"},
496 {ns_t_mx, "MX", "mail exchanger"},
497 {ns_t_txt, "TXT", "text"},
498 {ns_t_rp, "RP", "responsible person"},
499 {ns_t_afsdb, "AFSDB", "DCE or AFS server"},
500 {ns_t_x25, "X25", "X25 address"},
501 {ns_t_isdn, "ISDN", "ISDN address"},
502 {ns_t_rt, "RT", "router"},
503 {ns_t_nsap, "NSAP", "nsap address"},
504 {ns_t_nsap_ptr, "NSAP_PTR", "domain name pointer"},
505 {ns_t_sig, "SIG", "signature"},
506 {ns_t_key, "KEY", "key"},
507 {ns_t_px, "PX", "mapping information"},
508 {ns_t_gpos, "GPOS", "geographical position (withdrawn)"},
509 {ns_t_aaaa, "AAAA", "IPv6 address"},
510 {ns_t_loc, "LOC", "location"},
511 {ns_t_nxt, "NXT", "next valid name (unimplemented)"},
512 {ns_t_eid, "EID", "endpoint identifier (unimplemented)"},
513 {ns_t_nimloc, "NIMLOC", "NIMROD locator (unimplemented)"},
514 {ns_t_srv, "SRV", "server selection"},
515 {ns_t_atma, "ATMA", "ATM address (unimplemented)"},
516 {ns_t_naptr, "NAPTR", "naptr"},
517 {ns_t_kx, "KX", "key exchange"},
518 {ns_t_cert, "CERT", "certificate"},
519 {ns_t_a6, "A", "IPv6 address (experminental)"},
520 {ns_t_dname, "DNAME", "non-terminal redirection"},
521 {ns_t_opt, "OPT", "opt"},
522 {ns_t_apl, "apl", "apl"},
523 {ns_t_ds, "DS", "delegation signer"},
524 {ns_t_sshfp, "SSFP", "SSH fingerprint"},
525 {ns_t_ipseckey, "IPSECKEY", "IPSEC key"},
526 {ns_t_rrsig, "RRSIG", "rrsig"},
527 {ns_t_nsec, "NSEC", "nsec"},
528 {ns_t_dnskey, "DNSKEY", "DNS key"},
529 {ns_t_dhcid, "DHCID", "dynamic host configuration identifier"},
530 {ns_t_nsec3, "NSEC3", "nsec3"},
531 {ns_t_nsec3param, "NSEC3PARAM", "NSEC3 parameters"},
532 {ns_t_hip, "HIP", "host identity protocol"},
533 {ns_t_spf, "SPF", "sender policy framework"},
534 {ns_t_tkey, "TKEY", "tkey"},
535 {ns_t_tsig, "TSIG", "transaction signature"},
536 {ns_t_ixfr, "IXFR", "incremental zone transfer"},
537 {ns_t_axfr, "AXFR", "zone transfer"},
538 {ns_t_zxfr, "ZXFR", "compressed zone transfer"},
539 {ns_t_mailb, "MAILB", "mailbox-related data (deprecated)"},
540 {ns_t_maila, "MAILA", "mail agent (deprecated)"},
541 {ns_t_naptr, "NAPTR", "URN Naming Authority"},
542 {ns_t_kx, "KX", "Key Exchange"},
543 {ns_t_cert, "CERT", "Certificate"},
544 {ns_t_a6, "A6", "IPv6 Address"},
545 {ns_t_dname, "DNAME", "dname"},
546 {ns_t_sink, "SINK", "Kitchen Sink (experimental)"},
547 {ns_t_opt, "OPT", "EDNS Options"},
548 {ns_t_any, "ANY", "\"any\""},
549 {ns_t_dlv, "DLV", "DNSSEC look-aside validation"},
550 {0, NULL, NULL}
551 };
552
553 /*
554 * Names of DNS rcodes.
555 */
556 const struct res_sym __p_rcode_syms[] = {
557 {ns_r_noerror, "NOERROR", "no error"},
558 {ns_r_formerr, "FORMERR", "format error"},
559 {ns_r_servfail, "SERVFAIL", "server failed"},
560 {ns_r_nxdomain, "NXDOMAIN", "no such domain name"},
561 {ns_r_notimpl, "NOTIMP", "not implemented"},
562 {ns_r_refused, "REFUSED", "refused"},
563 {ns_r_yxdomain, "YXDOMAIN", "domain name exists"},
564 {ns_r_yxrrset, "YXRRSET", "rrset exists"},
565 {ns_r_nxrrset, "NXRRSET", "rrset doesn't exist"},
566 {ns_r_notauth, "NOTAUTH", "not authoritative"},
567 {ns_r_notzone, "NOTZONE", "Not in zone"},
568 {ns_r_max, "", ""},
569 {ns_r_badsig, "BADSIG", "bad signature"},
570 {ns_r_badkey, "BADKEY", "bad key"},
571 {ns_r_badtime, "BADTIME", "bad time"},
572 {0, NULL, NULL}
573 };
574
575 int
sym_ston(const struct res_sym * syms,const char * name,int * success)576 sym_ston(const struct res_sym *syms, const char *name, int *success) {
577 for (; syms->name != 0; syms++) {
578 if (strcasecmp (name, syms->name) == 0) {
579 if (success)
580 *success = 1;
581 return (syms->number);
582 }
583 }
584 if (success)
585 *success = 0;
586 return (syms->number); /* The default value. */
587 }
588
589 const char *
sym_ntos(const struct res_sym * syms,int number,int * success)590 sym_ntos(const struct res_sym *syms, int number, int *success) {
591 static char unname[20];
592
593 for (; syms->name != 0; syms++) {
594 if (number == syms->number) {
595 if (success)
596 *success = 1;
597 return (syms->name);
598 }
599 }
600
601 snprintf(unname, sizeof(unname), "%d", number); /* XXX nonreentrant */
602 if (success)
603 *success = 0;
604 return (unname);
605 }
606
607 const char *
sym_ntop(const struct res_sym * syms,int number,int * success)608 sym_ntop(const struct res_sym *syms, int number, int *success) {
609 static char unname[20];
610
611 for (; syms->name != 0; syms++) {
612 if (number == syms->number) {
613 if (success)
614 *success = 1;
615 return (syms->humanname);
616 }
617 }
618 snprintf(unname, sizeof(unname), "%d", number); /* XXX nonreentrant */
619 if (success)
620 *success = 0;
621 return (unname);
622 }
623
624 /*
625 * Return a string for the type.
626 */
627 const char *
p_type(int type)628 p_type(int type) {
629 int success;
630 const char *result;
631 static char typebuf[20];
632
633 result = sym_ntos(__p_type_syms, type, &success);
634 if (success)
635 return (result);
636 if (type < 0 || type > 0xffff)
637 return ("BADTYPE");
638 snprintf(typebuf, sizeof(typebuf), "TYPE%d", type);
639 return (typebuf);
640 }
641
642 /*
643 * Return a string for the type.
644 */
645 const char *
p_section(int section,int opcode)646 p_section(int section, int opcode) {
647 const struct res_sym *symbols;
648
649 switch (opcode) {
650 case ns_o_update:
651 symbols = __p_update_section_syms;
652 break;
653 default:
654 symbols = __p_default_section_syms;
655 break;
656 }
657 return (sym_ntos(symbols, section, (int *)0));
658 }
659
660 /*
661 * Return a mnemonic for class.
662 */
663 const char *
p_class(int class)664 p_class(int class) {
665 int success;
666 const char *result;
667 static char classbuf[20];
668
669 result = sym_ntos(__p_class_syms, class, &success);
670 if (success)
671 return (result);
672 if (class < 0 || class > 0xffff)
673 return ("BADCLASS");
674 snprintf(classbuf, sizeof(classbuf), "CLASS%d", class);
675 return (classbuf);
676 }
677
678 /*
679 * Return a mnemonic for an option
680 */
681 const char *
p_option(u_long option)682 p_option(u_long option) {
683 static char nbuf[40];
684
685 switch (option) {
686 case RES_INIT: return "init";
687 case RES_DEBUG: return "debug";
688 case RES_AAONLY: return "aaonly(unimpl)";
689 case RES_USEVC: return "usevc";
690 case RES_PRIMARY: return "primry(unimpl)";
691 case RES_IGNTC: return "igntc";
692 case RES_RECURSE: return "recurs";
693 case RES_DEFNAMES: return "defnam";
694 case RES_STAYOPEN: return "styopn";
695 case RES_DNSRCH: return "dnsrch";
696 case RES_INSECURE1: return "insecure1";
697 case RES_INSECURE2: return "insecure2";
698 case RES_NOALIASES: return "noaliases";
699 case RES_USE_INET6: return "inet6";
700 #ifdef RES_USE_EDNS0 /* KAME extension */
701 case RES_USE_EDNS0: return "edns0";
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: snprintf(nbuf, sizeof(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 static char nbuf[40]; /* XXX nonreentrant */
727
728 if (ns_format_ttl((u_long)value, nbuf, sizeof nbuf) < 0)
729 snprintf(nbuf, sizeof(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 snprintf(ret, sizeof(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 const 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 static char retbuf[sizeof "90000000.00"]; /* XXX nonreentrant */
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) snprintf(retbuf, sizeof(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
918 while (!isspace((unsigned char)*cp)) /* if any trailing garbage */
919 cp++;
920
921 while (isspace((unsigned char)*cp)) /* move to next field */
922 cp++;
923
924 *latlonstrptr = cp;
925
926 return (retval);
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,size_t bufsiz)1041 loc_ntoa(const u_char *binary, char *ascii, size_t bufsiz)
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) snprintf(ascii, bufsiz, "; 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 snprintf(ascii, bufsiz,
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 /*
1175 * Make dates expressed in seconds-since-Jan-1-1970 easy to read.
1176 * SIG records are required to be printed like this, by the Secure DNS RFC.
1177 */
1178 char *
p_secstodate(u_long secs)1179 p_secstodate (u_long secs) {
1180 /* XXX nonreentrant */
1181 static char output[15]; /* YYYYMMDDHHMMSS and null */
1182 time_t myclock = secs;
1183 struct tm *mytime;
1184 #ifdef HAVE_TIME_R
1185 struct tm res;
1186
1187 mytime = gmtime_r(&myclock, &res);
1188 #else
1189 mytime = gmtime(&myclock);
1190 #endif
1191 mytime->tm_year += 1900;
1192 mytime->tm_mon += 1;
1193 snprintf(output, sizeof(output), "%04d%02d%02d%02d%02d%02d",
1194 mytime->tm_year, mytime->tm_mon, mytime->tm_mday,
1195 mytime->tm_hour, mytime->tm_min, mytime->tm_sec);
1196 return (output);
1197 }
1198
1199 u_int16_t
res_nametoclass(const char * buf,int * successp)1200 res_nametoclass(const char *buf, int *successp) {
1201 unsigned long result;
1202 char *endptr;
1203 int success;
1204
1205 result = sym_ston(__p_class_syms, buf, &success);
1206 if (success)
1207 goto done;
1208
1209 if (strncasecmp(buf, "CLASS", 5) != 0 ||
1210 !isdigit((unsigned char)buf[5]))
1211 goto done;
1212 errno = 0;
1213 result = strtoul(buf + 5, &endptr, 10);
1214 if (errno == 0 && *endptr == '\0' && result <= 0xffffU)
1215 success = 1;
1216 done:
1217 if (successp)
1218 *successp = success;
1219 return (u_int16_t)(result);
1220 }
1221
1222 u_int16_t
res_nametotype(const char * buf,int * successp)1223 res_nametotype(const char *buf, int *successp) {
1224 unsigned long result;
1225 char *endptr;
1226 int success;
1227
1228 result = sym_ston(__p_type_syms, buf, &success);
1229 if (success)
1230 goto done;
1231
1232 if (strncasecmp(buf, "type", 4) != 0 ||
1233 !isdigit((unsigned char)buf[4]))
1234 goto done;
1235 errno = 0;
1236 result = strtoul(buf + 4, &endptr, 10);
1237 if (errno == 0 && *endptr == '\0' && result <= 0xffffU)
1238 success = 1;
1239 done:
1240 if (successp)
1241 *successp = success;
1242 return (u_int16_t)(result);
1243 }
1244