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