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 #define LOG_TAG "res_debug"
99
100 #include <sys/param.h>
101 #include <sys/socket.h>
102 #include <sys/types.h>
103
104 #include <arpa/inet.h>
105 #include <arpa/nameser.h>
106 #include <netinet/in.h>
107
108 #include <aidl/android/net/IDnsResolver.h>
109 #include <android-base/logging.h>
110 #include <ctype.h>
111 #include <errno.h>
112 #include <math.h>
113 #include <netdb.h>
114 #include <stdlib.h>
115 #include <string.h>
116 #include <strings.h>
117 #include <time.h>
118
119 #include "resolv_private.h"
120
121 // Default to disabling verbose logging unless overridden by Android.bp
122 // for debuggable builds.
123 //
124 // NOTE: Verbose resolver logs could contain PII -- do NOT enable in production builds
125 #ifndef RESOLV_ALLOW_VERBOSE_LOGGING
126 #define RESOLV_ALLOW_VERBOSE_LOGGING 0
127 #endif
128
129 struct res_sym {
130 int number; /* Identifying number, like T_MX */
131 const char* name; /* Its symbolic name, like "MX" */
132 const char* humanname; /* Its fun name, like "mail exchanger" */
133 };
134
135 // add a formatted string to a bounded buffer
136 // TODO: convert to std::string
dbprint(char * p,char * end,const char * format,...)137 static char* dbprint(char* p, char* end, const char* format, ...) {
138 int avail, n;
139 va_list args;
140
141 avail = end - p;
142
143 if (avail <= 0) return p;
144
145 va_start(args, format);
146 n = vsnprintf(p, avail, format, args);
147 va_end(args);
148
149 /* certain C libraries return -1 in case of truncation */
150 if (n < 0 || n > avail) n = avail;
151
152 p += n;
153 /* certain C libraries do not zero-terminate in case of truncation */
154 if (p == end) p[-1] = 0;
155
156 return p;
157 }
158
do_section(ns_msg * handle,ns_sect section)159 static void do_section(ns_msg* handle, ns_sect section) {
160 int n, rrnum;
161 int buflen = 2048;
162 ns_opcode opcode;
163 ns_rr rr;
164 char temp[2048], *p = temp, *end = p + sizeof(temp);
165
166 /*
167 * Print answer records.
168 */
169
170 char* buf = (char*) malloc((size_t) buflen);
171 if (buf == NULL) {
172 dbprint(p, end, ";; memory allocation failure\n");
173 LOG(VERBOSE) << __func__ << ": " << temp;
174 return;
175 }
176
177 opcode = (ns_opcode) ns_msg_getflag(*handle, ns_f_opcode);
178 rrnum = 0;
179 for (;;) {
180 if (ns_parserr(handle, section, rrnum, &rr)) {
181 if (errno != ENODEV)
182 dbprint(p, end, ";; ns_parserr: %s", strerror(errno));
183 goto cleanup;
184 }
185 if (section == ns_s_qd)
186 dbprint(p, end, ";;\t%s, type = %s, class = %s\n", ns_rr_name(rr),
187 p_type(ns_rr_type(rr)), p_class(ns_rr_class(rr)));
188 else if (section == ns_s_ar && ns_rr_type(rr) == ns_t_opt) {
189 size_t rdatalen, ttl;
190 uint16_t optcode, optlen;
191
192 rdatalen = ns_rr_rdlen(rr);
193 ttl = ns_rr_ttl(rr);
194 dbprint(p, end, "; EDNS: version: %zu, udp=%u, flags=%04zx\n", (ttl >> 16) & 0xff,
195 ns_rr_class(rr), ttl & 0xffff);
196 const u_char* cp = ns_rr_rdata(rr);
197 while (rdatalen <= ns_rr_rdlen(rr) && rdatalen >= 4) {
198 int i;
199
200 GETSHORT(optcode, cp);
201 GETSHORT(optlen, cp);
202
203 if (optcode == NS_OPT_NSID) {
204 p = dbprint(p, end, "; NSID: ");
205 if (optlen == 0) {
206 p = dbprint(p, end, "; NSID\n");
207 } else {
208 p = dbprint(p, end, "; NSID: ");
209 for (i = 0; i < optlen; i++) {
210 p = dbprint(p, end, "%02x ", cp[i]);
211 }
212 p = dbprint(p, end, " (");
213 for (i = 0; i < optlen; i++) {
214 p = dbprint(p, end, "%c", isprint(cp[i]) ? cp[i] : '.');
215 }
216 p = dbprint(p, end, ")\n");
217 }
218 } else {
219 if (optlen == 0) {
220 p = dbprint(p, end, "; OPT=%u\n", optcode);
221 } else {
222 p = dbprint(p, end, "; OPT=%u: ", optcode);
223 for (i = 0; i < optlen; i++) {
224 p = dbprint(p, end, "%02x ", cp[i]);
225 }
226 p = dbprint(p, end, " (");
227 for (i = 0; i < optlen; i++) {
228 p = dbprint(p, end, "%c", isprint(cp[i]) ? cp[i] : '.');
229 }
230 p = dbprint(p, end, ")\n");
231 }
232 }
233 rdatalen -= 4 + optlen;
234 cp += optlen;
235 }
236 } else {
237 n = ns_sprintrr(handle, &rr, NULL, NULL, buf, (u_int) buflen);
238 if (n < 0) {
239 if (errno == ENOSPC) {
240 free(buf);
241 buf = NULL;
242 if (buflen < 131072) {
243 buf = (char*) malloc((size_t)(buflen += 1024));
244 }
245 if (buf == NULL) {
246 p = dbprint(p, end, ";; memory allocation failure\n");
247 LOG(VERBOSE) << __func__ << ": " << temp;
248 return;
249 }
250 continue;
251 }
252 p = dbprint(p, end, ";; ns_sprintrr: %s\n", strerror(errno));
253 goto cleanup;
254 }
255 p = dbprint(p, end, ";; %s\n", buf);
256 }
257 rrnum++;
258 }
259 cleanup:
260 free(buf);
261 LOG(VERBOSE) << temp;
262 }
263
264 /*
265 * Print the contents of a query.
266 * This is intended to be primarily a debugging routine.
267 */
res_pquery(const u_char * msg,int len)268 void res_pquery(const u_char* msg, int len) {
269 if (!WOULD_LOG(VERBOSE)) return;
270
271 ns_msg handle;
272 int qdcount, ancount, nscount, arcount;
273 u_int opcode, rcode, id;
274 char temp[2048], *p = temp, *end = p + sizeof(temp);
275
276 if (ns_initparse(msg, len, &handle) < 0) {
277 dbprint(p, end, ";; ns_initparse: %s\n", strerror(errno));
278 return;
279 }
280 opcode = ns_msg_getflag(handle, ns_f_opcode);
281 rcode = ns_msg_getflag(handle, ns_f_rcode);
282 id = ns_msg_id(handle);
283 qdcount = ns_msg_count(handle, ns_s_qd);
284 ancount = ns_msg_count(handle, ns_s_an);
285 nscount = ns_msg_count(handle, ns_s_ns);
286 arcount = ns_msg_count(handle, ns_s_ar);
287
288 /*
289 * Print header fields.
290 */
291 dbprint(p, end, ";; ->>HEADER<<- opcode: %s, status: %s, id: %d\n", _res_opcodes[opcode],
292 p_rcode((int)rcode), id);
293 p = dbprint(p, end, ";");
294 p = dbprint(p, end, "; flags:");
295 if (ns_msg_getflag(handle, ns_f_qr)) p = dbprint(p, end, " qr");
296 if (ns_msg_getflag(handle, ns_f_aa)) p = dbprint(p, end, " aa");
297 if (ns_msg_getflag(handle, ns_f_tc)) p = dbprint(p, end, " tc");
298 if (ns_msg_getflag(handle, ns_f_rd)) p = dbprint(p, end, " rd");
299 if (ns_msg_getflag(handle, ns_f_ra)) p = dbprint(p, end, " ra");
300 if (ns_msg_getflag(handle, ns_f_z)) p = dbprint(p, end, " ??");
301 if (ns_msg_getflag(handle, ns_f_ad)) p = dbprint(p, end, " ad");
302 if (ns_msg_getflag(handle, ns_f_cd)) p = dbprint(p, end, " cd");
303 p = dbprint(p, end, "; %s: %d", p_section(ns_s_qd, (int)opcode), qdcount);
304 p = dbprint(p, end, ", %s: %d", p_section(ns_s_an, (int)opcode), ancount);
305 p = dbprint(p, end, ", %s: %d", p_section(ns_s_ns, (int)opcode), nscount);
306 p = dbprint(p, end, ", %s: %d", p_section(ns_s_ar, (int)opcode), arcount);
307
308 LOG(VERBOSE) << temp;
309
310 /*
311 * Print the various sections.
312 */
313 do_section(&handle, ns_s_qd);
314 do_section(&handle, ns_s_an);
315 do_section(&handle, ns_s_ns);
316 do_section(&handle, ns_s_ar);
317 if (qdcount == 0 && ancount == 0 && nscount == 0 && arcount == 0) LOG(VERBOSE) << ";;";
318 }
319
320 /*
321 * Names of RR classes and qclasses. Classes and qclasses are the same, except
322 * that C_ANY is a qclass but not a class. (You can ask for records of class
323 * C_ANY, but you can't have any records of that class in the database.)
324 */
325 static const struct res_sym p_class_syms[] = {
326 {C_IN, "IN", (char*) 0}, {C_CHAOS, "CH", (char*) 0}, {C_CHAOS, "CHAOS", (char*) 0},
327 {C_HS, "HS", (char*) 0}, {C_HS, "HESIOD", (char*) 0}, {C_ANY, "ANY", (char*) 0},
328 {C_NONE, "NONE", (char*) 0}, {C_IN, (char*) 0, (char*) 0}};
329
330 /*
331 * Names of message sections.
332 */
333 static const struct res_sym p_default_section_syms[] = {{ns_s_qd, "QUERY", (char*) 0},
334 {ns_s_an, "ANSWER", (char*) 0},
335 {ns_s_ns, "AUTHORITY", (char*) 0},
336 {ns_s_ar, "ADDITIONAL", (char*) 0},
337 {0, (char*) 0, (char*) 0}};
338
339 static const struct res_sym p_update_section_syms[] = {{S_ZONE, "ZONE", (char*) 0},
340 {S_PREREQ, "PREREQUISITE", (char*) 0},
341 {S_UPDATE, "UPDATE", (char*) 0},
342 {S_ADDT, "ADDITIONAL", (char*) 0},
343 {0, (char*) 0, (char*) 0}};
344
345 /*
346 * Names of RR types and qtypes. Types and qtypes are the same, except
347 * that T_ANY is a qtype but not a type. (You can ask for records of type
348 * T_ANY, but you can't have any records of that type in the database.)
349 */
350 const struct res_sym p_type_syms[] = {
351 {ns_t_a, "A", "address"},
352 {ns_t_ns, "NS", "name server"},
353 {ns_t_md, "MD", "mail destination (deprecated)"},
354 {ns_t_mf, "MF", "mail forwarder (deprecated)"},
355 {ns_t_cname, "CNAME", "canonical name"},
356 {ns_t_soa, "SOA", "start of authority"},
357 {ns_t_mb, "MB", "mailbox"},
358 {ns_t_mg, "MG", "mail group member"},
359 {ns_t_mr, "MR", "mail rename"},
360 {ns_t_null, "NULL", "null"},
361 {ns_t_wks, "WKS", "well-known service (deprecated)"},
362 {ns_t_ptr, "PTR", "domain name pointer"},
363 {ns_t_hinfo, "HINFO", "host information"},
364 {ns_t_minfo, "MINFO", "mailbox information"},
365 {ns_t_mx, "MX", "mail exchanger"},
366 {ns_t_txt, "TXT", "text"},
367 {ns_t_rp, "RP", "responsible person"},
368 {ns_t_afsdb, "AFSDB", "DCE or AFS server"},
369 {ns_t_x25, "X25", "X25 address"},
370 {ns_t_isdn, "ISDN", "ISDN address"},
371 {ns_t_rt, "RT", "router"},
372 {ns_t_nsap, "NSAP", "nsap address"},
373 {ns_t_nsap_ptr, "NSAP_PTR", "domain name pointer"},
374 {ns_t_sig, "SIG", "signature"},
375 {ns_t_key, "KEY", "key"},
376 {ns_t_px, "PX", "mapping information"},
377 {ns_t_gpos, "GPOS", "geographical position (withdrawn)"},
378 {ns_t_aaaa, "AAAA", "IPv6 address"},
379 {ns_t_loc, "LOC", "location"},
380 {ns_t_nxt, "NXT", "next valid name (unimplemented)"},
381 {ns_t_eid, "EID", "endpoint identifier (unimplemented)"},
382 {ns_t_nimloc, "NIMLOC", "NIMROD locator (unimplemented)"},
383 {ns_t_srv, "SRV", "server selection"},
384 {ns_t_atma, "ATMA", "ATM address (unimplemented)"},
385 {ns_t_naptr, "NAPTR", "naptr"},
386 {ns_t_kx, "KX", "key exchange"},
387 {ns_t_cert, "CERT", "certificate"},
388 {ns_t_a6, "A", "IPv6 address (experminental)"},
389 {ns_t_dname, "DNAME", "non-terminal redirection"},
390 {ns_t_opt, "OPT", "opt"},
391 {ns_t_apl, "apl", "apl"},
392 {ns_t_ds, "DS", "delegation signer"},
393 {ns_t_sshfp, "SSFP", "SSH fingerprint"},
394 {ns_t_ipseckey, "IPSECKEY", "IPSEC key"},
395 {ns_t_rrsig, "RRSIG", "rrsig"},
396 {ns_t_nsec, "NSEC", "nsec"},
397 {ns_t_dnskey, "DNSKEY", "DNS key"},
398 {ns_t_dhcid, "DHCID", "dynamic host configuration identifier"},
399 {ns_t_nsec3, "NSEC3", "nsec3"},
400 {ns_t_nsec3param, "NSEC3PARAM", "NSEC3 parameters"},
401 {ns_t_hip, "HIP", "host identity protocol"},
402 {ns_t_spf, "SPF", "sender policy framework"},
403 {ns_t_tkey, "TKEY", "tkey"},
404 {ns_t_tsig, "TSIG", "transaction signature"},
405 {ns_t_ixfr, "IXFR", "incremental zone transfer"},
406 {ns_t_axfr, "AXFR", "zone transfer"},
407 {ns_t_zxfr, "ZXFR", "compressed zone transfer"},
408 {ns_t_mailb, "MAILB", "mailbox-related data (deprecated)"},
409 {ns_t_maila, "MAILA", "mail agent (deprecated)"},
410 {ns_t_naptr, "NAPTR", "URN Naming Authority"},
411 {ns_t_kx, "KX", "Key Exchange"},
412 {ns_t_cert, "CERT", "Certificate"},
413 {ns_t_a6, "A6", "IPv6 Address"},
414 {ns_t_dname, "DNAME", "dname"},
415 {ns_t_sink, "SINK", "Kitchen Sink (experimental)"},
416 {ns_t_opt, "OPT", "EDNS Options"},
417 {ns_t_any, "ANY", "\"any\""},
418 {ns_t_dlv, "DLV", "DNSSEC look-aside validation"},
419 {0, NULL, NULL}};
420
421 /*
422 * Names of DNS rcodes.
423 */
424 static const struct res_sym p_rcode_syms[] = {{ns_r_noerror, "NOERROR", "no error"},
425 {ns_r_formerr, "FORMERR", "format error"},
426 {ns_r_servfail, "SERVFAIL", "server failed"},
427 {ns_r_nxdomain, "NXDOMAIN", "no such domain name"},
428 {ns_r_notimpl, "NOTIMP", "not implemented"},
429 {ns_r_refused, "REFUSED", "refused"},
430 {ns_r_yxdomain, "YXDOMAIN", "domain name exists"},
431 {ns_r_yxrrset, "YXRRSET", "rrset exists"},
432 {ns_r_nxrrset, "NXRRSET", "rrset doesn't exist"},
433 {ns_r_notauth, "NOTAUTH", "not authoritative"},
434 {ns_r_notzone, "NOTZONE", "Not in zone"},
435 {ns_r_max, "", ""},
436 {ns_r_badsig, "BADSIG", "bad signature"},
437 {ns_r_badkey, "BADKEY", "bad key"},
438 {ns_r_badtime, "BADTIME", "bad time"},
439 {0, NULL, NULL}};
440
sym_ntos(const struct res_sym * syms,int number,int * success)441 static const char* sym_ntos(const struct res_sym* syms, int number, int* success) {
442 static char unname[20];
443
444 for (; syms->name != 0; syms++) {
445 if (number == syms->number) {
446 if (success) *success = 1;
447 return (syms->name);
448 }
449 }
450
451 snprintf(unname, sizeof(unname), "%d", number); /* XXX nonreentrant */
452 if (success) *success = 0;
453 return (unname);
454 }
455
456 /*
457 * Return a string for the type.
458 */
p_type(int type)459 const char* p_type(int type) {
460 int success;
461 const char* result;
462 static char typebuf[20];
463
464 result = sym_ntos(p_type_syms, type, &success);
465 if (success) return (result);
466 if (type < 0 || type > 0xffff) return ("BADTYPE");
467 snprintf(typebuf, sizeof(typebuf), "TYPE%d", type);
468 return (typebuf);
469 }
470
471 /*
472 * Return a string for the type.
473 */
p_section(int section,int opcode)474 const char* p_section(int section, int opcode) {
475 const struct res_sym* symbols;
476
477 switch (opcode) {
478 case ns_o_update:
479 symbols = p_update_section_syms;
480 break;
481 default:
482 symbols = p_default_section_syms;
483 break;
484 }
485 return (sym_ntos(symbols, section, (int*) 0));
486 }
487
488 /*
489 * Return a mnemonic for class.
490 */
p_class(int cl)491 const char* p_class(int cl) {
492 int success;
493 const char* result;
494 static char classbuf[20];
495
496 result = sym_ntos(p_class_syms, cl, &success);
497 if (success) return (result);
498 if (cl < 0 || cl > 0xffff) return ("BADCLASS");
499 snprintf(classbuf, sizeof(classbuf), "CLASS%d", cl);
500 return (classbuf);
501 }
502
503 /*
504 * Return a string for the rcode.
505 */
p_rcode(int rcode)506 const char* p_rcode(int rcode) {
507 return (sym_ntos(p_rcode_syms, rcode, (int*) 0));
508 }
509
resolv_set_log_severity(uint32_t logSeverity)510 int resolv_set_log_severity(uint32_t logSeverity) {
511 switch (logSeverity) {
512 case aidl::android::net::IDnsResolver::DNS_RESOLVER_LOG_VERBOSE:
513 logSeverity = android::base::VERBOSE;
514 // *** enable verbose logging only when DBG is set. It prints sensitive data ***
515 if (RESOLV_ALLOW_VERBOSE_LOGGING == false) {
516 logSeverity = android::base::DEBUG;
517 LOG(ERROR) << "Refusing to set VERBOSE logging in non-debuggable build";
518 // TODO: Return EACCES then callers could know if the log
519 // severity is acceptable
520 }
521 break;
522 case aidl::android::net::IDnsResolver::DNS_RESOLVER_LOG_DEBUG:
523 logSeverity = android::base::DEBUG;
524 break;
525 case aidl::android::net::IDnsResolver::DNS_RESOLVER_LOG_INFO:
526 logSeverity = android::base::INFO;
527 break;
528 case aidl::android::net::IDnsResolver::DNS_RESOLVER_LOG_WARNING:
529 logSeverity = android::base::WARNING;
530 break;
531 case aidl::android::net::IDnsResolver::DNS_RESOLVER_LOG_ERROR:
532 logSeverity = android::base::ERROR;
533 break;
534 default:
535 LOG(ERROR) << __func__ << ": invalid log severity: " << logSeverity;
536 return -EINVAL;
537 }
538 android::base::SetMinimumLogSeverity(static_cast<android::base::LogSeverity>(logSeverity));
539 return 0;
540 }
541