531 lines
22 KiB
C++
531 lines
22 KiB
C++
/* $NetBSD: res_debug.c,v 1.13 2012/06/25 22:32:45 abs Exp $ */
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/*
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* Portions Copyright (C) 2004, 2005, 2008, 2009 Internet Systems Consortium, Inc. ("ISC")
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* Portions Copyright (C) 1996-2003 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Copyright (c) 1985
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Portions Copyright (c) 1993 by Digital Equipment Corporation.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies, and that
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* the name of Digital Equipment Corporation not be used in advertising or
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* publicity pertaining to distribution of the document or software without
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* specific, written prior permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/*
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* Portions Copyright (c) 1995 by International Business Machines, Inc.
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*
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* International Business Machines, Inc. (hereinafter called IBM) grants
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* permission under its copyrights to use, copy, modify, and distribute this
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* Software with or without fee, provided that the above copyright notice and
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* all paragraphs of this notice appear in all copies, and that the name of IBM
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* not be used in connection with the marketing of any product incorporating
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* the Software or modifications thereof, without specific, written prior
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* permission.
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*
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* To the extent it has a right to do so, IBM grants an immunity from suit
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* under its patents, if any, for the use, sale or manufacture of products to
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* the extent that such products are used for performing Domain Name System
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* dynamic updates in TCP/IP networks by means of the Software. No immunity is
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* granted for any product per se or for any other function of any product.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", AND IBM DISCLAIMS ALL WARRANTIES,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE. IN NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL,
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* DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE, EVEN
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* IF IBM IS APPRISED OF THE POSSIBILITY OF SUCH DAMAGES.
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*/
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#define LOG_TAG "resolv"
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#include "res_debug.h"
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <arpa/nameser.h>
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#include <netinet/in.h>
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#include <aidl/android/net/IDnsResolver.h>
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#include <android-base/logging.h>
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#include <ctype.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <math.h>
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#include <netdb.h>
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#include <stdlib.h>
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#include <string.h>
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#include <strings.h>
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#include <time.h>
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#include "doh.h"
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#include "resolv_private.h"
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// Default to disabling verbose logging unless overridden by Android.bp
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// for debuggable builds.
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//
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// NOTE: Verbose resolver logs could contain PII -- do NOT enable in production builds
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#ifndef RESOLV_ALLOW_VERBOSE_LOGGING
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#define RESOLV_ALLOW_VERBOSE_LOGGING 0
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#endif
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using fmt::format_to;
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struct res_sym {
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int number; /* Identifying number, like T_MX */
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const char* name; /* Its symbolic name, like "MX" */
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const char* humanname; /* Its fun name, like "mail exchanger" */
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};
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static void do_section(ns_msg* handle, ns_sect section) {
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int n, rrnum = 0;
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int buflen = 2048;
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ns_rr rr;
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std::string s;
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auto out = std::back_inserter(s);
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/*
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* Print answer records.
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*/
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for (;;) {
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if (ns_parserr(handle, section, rrnum, &rr)) {
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if (errno != ENODEV) format_to(out, "ns_parserr: {}", strerror(errno));
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LOG(VERBOSE) << s;
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return;
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}
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if (rrnum == 0) {
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int opcode = ns_msg_getflag(*handle, ns_f_opcode);
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format_to(out, ";; {} SECTION:\n", p_section(section, opcode));
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}
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if (section == ns_s_qd)
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format_to(out, ";;\t{}, type = {}, class = {}\n", ns_rr_name(rr),
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p_type(ns_rr_type(rr)), p_class(ns_rr_class(rr)));
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else if (section == ns_s_ar && ns_rr_type(rr) == ns_t_opt) {
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size_t rdatalen;
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uint16_t optcode, optlen;
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rdatalen = ns_rr_rdlen(rr);
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format_to(out, "; EDNS: version: {}, udp={}, flags={}\n", (rr.ttl >> 16) & 0xff,
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ns_rr_class(rr), rr.ttl & 0xffff);
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const uint8_t* cp = ns_rr_rdata(rr);
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while (rdatalen <= ns_rr_rdlen(rr) && rdatalen >= 4) {
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int i;
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GETSHORT(optcode, cp);
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GETSHORT(optlen, cp);
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if (optcode == NS_OPT_NSID) {
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format_to(out, "; NSID: ");
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if (optlen == 0) {
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format_to(out, "; NSID\n");
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} else {
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format_to(out, "; NSID: ");
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for (i = 0; i < optlen; i++) {
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format_to(out, "{:02x} ", cp[i]);
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}
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format_to(out, " (");
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for (i = 0; i < optlen; i++) {
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format_to(out, "{} ", isprint(cp[i]) ? cp[i] : '.');
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}
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format_to(out, ")\n");
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}
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} else {
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if (optlen == 0) {
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format_to(out, "; OPT={}\n", optcode);
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} else {
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format_to(out, "; OPT={}: ", optcode);
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for (i = 0; i < optlen; i++) {
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format_to(out, "{:02x} ", cp[i]);
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}
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format_to(out, " (");
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for (i = 0; i < optlen; i++) {
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format_to(out, "{}", isprint(cp[i]) ? cp[i] : '.');
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}
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format_to(out, ")\n");
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}
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}
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rdatalen -= 4 + optlen;
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cp += optlen;
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}
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} else {
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auto buf = std::make_unique<char[]>(buflen);
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n = ns_sprintrr(handle, &rr, NULL, NULL, buf.get(), (uint32_t)buflen);
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if (n < 0) {
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if (errno == ENOSPC) {
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if (buflen < 131072) {
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buflen += 1024;
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continue;
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} else {
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format_to(out, "buflen over 131072");
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PLOG(VERBOSE) << s;
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return;
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}
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}
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format_to(out, "ns_sprintrr failed");
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PLOG(VERBOSE) << s;
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return;
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}
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format_to(out, ";; {}\n", buf.get());
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}
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rrnum++;
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}
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}
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// Convert bytes to its hexadecimal representation.
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// The returned string is double the size of input.
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std::string bytesToHexStr(std::span<const uint8_t> bytes) {
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static char const hex[16] = {'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
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std::string str;
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str.reserve(bytes.size() * 2);
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for (uint8_t ch : bytes) {
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str.append({hex[(ch & 0xf0) >> 4], hex[ch & 0xf]});
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}
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return str;
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}
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/*
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* Print the contents of a query.
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* This is intended to be primarily a debugging routine.
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*/
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void res_pquery(std::span<const uint8_t> msg) {
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if (!WOULD_LOG(VERBOSE)) return;
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ns_msg handle;
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int qdcount, ancount, nscount, arcount;
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uint32_t opcode, rcode, id;
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if (ns_initparse(msg.data(), msg.size(), &handle) < 0) {
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PLOG(VERBOSE) << "ns_initparse failed";
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return;
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}
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opcode = ns_msg_getflag(handle, ns_f_opcode);
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rcode = ns_msg_getflag(handle, ns_f_rcode);
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id = ns_msg_id(handle);
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qdcount = ns_msg_count(handle, ns_s_qd);
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ancount = ns_msg_count(handle, ns_s_an);
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nscount = ns_msg_count(handle, ns_s_ns);
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arcount = ns_msg_count(handle, ns_s_ar);
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/*
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* Print header fields.
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*/
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std::string s = fmt::format(";; ->>HEADER<<- opcode: {}, status: {}, id: {}\n",
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_res_opcodes[opcode], p_rcode((int)rcode), id);
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auto out = std::back_inserter(s);
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format_to(out, ";; flags:");
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if (ns_msg_getflag(handle, ns_f_qr)) format_to(out, " qr");
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if (ns_msg_getflag(handle, ns_f_aa)) format_to(out, " aa");
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if (ns_msg_getflag(handle, ns_f_tc)) format_to(out, " tc");
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if (ns_msg_getflag(handle, ns_f_rd)) format_to(out, " rd");
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if (ns_msg_getflag(handle, ns_f_ra)) format_to(out, " ra");
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if (ns_msg_getflag(handle, ns_f_z)) format_to(out, " ??");
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if (ns_msg_getflag(handle, ns_f_ad)) format_to(out, " ad");
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if (ns_msg_getflag(handle, ns_f_cd)) format_to(out, " cd");
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format_to(out, "; {}: {}", p_section(ns_s_qd, (int)opcode), qdcount);
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format_to(out, ", {}: {}", p_section(ns_s_an, (int)opcode), ancount);
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format_to(out, ", {}: {}", p_section(ns_s_ns, (int)opcode), nscount);
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format_to(out, ", {}: {}", p_section(ns_s_ar, (int)opcode), arcount);
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LOG(VERBOSE) << s;
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/*
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* Print the various sections.
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*/
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do_section(&handle, ns_s_qd);
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do_section(&handle, ns_s_an);
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do_section(&handle, ns_s_ns);
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do_section(&handle, ns_s_ar);
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LOG(VERBOSE) << "Hex dump:";
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LOG(VERBOSE) << bytesToHexStr(msg);
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}
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/*
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* Names of RR classes and qclasses. Classes and qclasses are the same, except
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* that C_ANY is a qclass but not a class. (You can ask for records of class
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* C_ANY, but you can't have any records of that class in the database.)
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*/
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static const struct res_sym p_class_syms[] = {
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{C_IN, "IN", (char*) 0}, {C_CHAOS, "CH", (char*) 0}, {C_CHAOS, "CHAOS", (char*) 0},
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{C_HS, "HS", (char*) 0}, {C_HS, "HESIOD", (char*) 0}, {C_ANY, "ANY", (char*) 0},
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{C_NONE, "NONE", (char*) 0}, {C_IN, (char*) 0, (char*) 0}};
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/*
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* Names of message sections.
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*/
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static const struct res_sym p_default_section_syms[] = {{ns_s_qd, "QUERY", (char*) 0},
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{ns_s_an, "ANSWER", (char*) 0},
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{ns_s_ns, "AUTHORITY", (char*) 0},
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{ns_s_ar, "ADDITIONAL", (char*) 0},
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{0, (char*) 0, (char*) 0}};
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static const struct res_sym p_update_section_syms[] = {{S_ZONE, "ZONE", (char*) 0},
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{S_PREREQ, "PREREQUISITE", (char*) 0},
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{S_UPDATE, "UPDATE", (char*) 0},
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{S_ADDT, "ADDITIONAL", (char*) 0},
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{0, (char*) 0, (char*) 0}};
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/*
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* Names of RR types and qtypes. Types and qtypes are the same, except
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* that T_ANY is a qtype but not a type. (You can ask for records of type
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* T_ANY, but you can't have any records of that type in the database.)
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*/
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const struct res_sym p_type_syms[] = {
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{ns_t_a, "A", "address"},
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{ns_t_ns, "NS", "name server"},
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{ns_t_md, "MD", "mail destination (deprecated)"},
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{ns_t_mf, "MF", "mail forwarder (deprecated)"},
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{ns_t_cname, "CNAME", "canonical name"},
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{ns_t_soa, "SOA", "start of authority"},
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{ns_t_mb, "MB", "mailbox"},
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{ns_t_mg, "MG", "mail group member"},
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{ns_t_mr, "MR", "mail rename"},
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{ns_t_null, "NULL", "null"},
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{ns_t_wks, "WKS", "well-known service (deprecated)"},
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{ns_t_ptr, "PTR", "domain name pointer"},
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{ns_t_hinfo, "HINFO", "host information"},
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{ns_t_minfo, "MINFO", "mailbox information"},
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{ns_t_mx, "MX", "mail exchanger"},
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{ns_t_txt, "TXT", "text"},
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{ns_t_rp, "RP", "responsible person"},
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{ns_t_afsdb, "AFSDB", "DCE or AFS server"},
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{ns_t_x25, "X25", "X25 address"},
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{ns_t_isdn, "ISDN", "ISDN address"},
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{ns_t_rt, "RT", "router"},
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{ns_t_nsap, "NSAP", "nsap address"},
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{ns_t_nsap_ptr, "NSAP_PTR", "domain name pointer"},
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{ns_t_sig, "SIG", "signature"},
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{ns_t_key, "KEY", "key"},
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{ns_t_px, "PX", "mapping information"},
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{ns_t_gpos, "GPOS", "geographical position (withdrawn)"},
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{ns_t_aaaa, "AAAA", "IPv6 address"},
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{ns_t_loc, "LOC", "location"},
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{ns_t_nxt, "NXT", "next valid name (unimplemented)"},
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{ns_t_eid, "EID", "endpoint identifier (unimplemented)"},
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{ns_t_nimloc, "NIMLOC", "NIMROD locator (unimplemented)"},
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{ns_t_srv, "SRV", "server selection"},
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{ns_t_atma, "ATMA", "ATM address (unimplemented)"},
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{ns_t_naptr, "NAPTR", "naptr"},
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{ns_t_kx, "KX", "key exchange"},
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{ns_t_cert, "CERT", "certificate"},
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{ns_t_a6, "A", "IPv6 address (experminental)"},
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{ns_t_dname, "DNAME", "non-terminal redirection"},
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{ns_t_opt, "OPT", "opt"},
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{ns_t_apl, "apl", "apl"},
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{ns_t_ds, "DS", "delegation signer"},
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{ns_t_sshfp, "SSFP", "SSH fingerprint"},
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{ns_t_ipseckey, "IPSECKEY", "IPSEC key"},
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{ns_t_rrsig, "RRSIG", "rrsig"},
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{ns_t_nsec, "NSEC", "nsec"},
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{ns_t_dnskey, "DNSKEY", "DNS key"},
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{ns_t_dhcid, "DHCID", "dynamic host configuration identifier"},
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{ns_t_nsec3, "NSEC3", "nsec3"},
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{ns_t_nsec3param, "NSEC3PARAM", "NSEC3 parameters"},
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{ns_t_hip, "HIP", "host identity protocol"},
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{ns_t_spf, "SPF", "sender policy framework"},
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{ns_t_tkey, "TKEY", "tkey"},
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{ns_t_tsig, "TSIG", "transaction signature"},
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{ns_t_ixfr, "IXFR", "incremental zone transfer"},
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{ns_t_axfr, "AXFR", "zone transfer"},
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{ns_t_zxfr, "ZXFR", "compressed zone transfer"},
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{ns_t_mailb, "MAILB", "mailbox-related data (deprecated)"},
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{ns_t_maila, "MAILA", "mail agent (deprecated)"},
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{ns_t_naptr, "NAPTR", "URN Naming Authority"},
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{ns_t_kx, "KX", "Key Exchange"},
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{ns_t_cert, "CERT", "Certificate"},
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{ns_t_a6, "A6", "IPv6 Address"},
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{ns_t_dname, "DNAME", "dname"},
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{ns_t_sink, "SINK", "Kitchen Sink (experimental)"},
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{ns_t_opt, "OPT", "EDNS Options"},
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{ns_t_any, "ANY", "\"any\""},
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{ns_t_dlv, "DLV", "DNSSEC look-aside validation"},
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{0, NULL, NULL}};
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/*
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* Names of DNS rcodes.
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*/
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static const struct res_sym p_rcode_syms[] = {{ns_r_noerror, "NOERROR", "no error"},
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{ns_r_formerr, "FORMERR", "format error"},
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{ns_r_servfail, "SERVFAIL", "server failed"},
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{ns_r_nxdomain, "NXDOMAIN", "no such domain name"},
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{ns_r_notimpl, "NOTIMP", "not implemented"},
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|
{ns_r_refused, "REFUSED", "refused"},
|
|
{ns_r_yxdomain, "YXDOMAIN", "domain name exists"},
|
|
{ns_r_yxrrset, "YXRRSET", "rrset exists"},
|
|
{ns_r_nxrrset, "NXRRSET", "rrset doesn't exist"},
|
|
{ns_r_notauth, "NOTAUTH", "not authoritative"},
|
|
{ns_r_notzone, "NOTZONE", "Not in zone"},
|
|
{ns_r_max, "", ""},
|
|
{ns_r_badsig, "BADSIG", "bad signature"},
|
|
{ns_r_badkey, "BADKEY", "bad key"},
|
|
{ns_r_badtime, "BADTIME", "bad time"},
|
|
{0, NULL, NULL}};
|
|
|
|
static const char* sym_ntos(const struct res_sym* syms, int number, int* success) {
|
|
static char unname[20];
|
|
|
|
for (; syms->name != 0; syms++) {
|
|
if (number == syms->number) {
|
|
if (success) *success = 1;
|
|
return (syms->name);
|
|
}
|
|
}
|
|
|
|
snprintf(unname, sizeof(unname), "%d", number); /* XXX nonreentrant */
|
|
if (success) *success = 0;
|
|
return (unname);
|
|
}
|
|
|
|
/*
|
|
* Return a string for the type.
|
|
*/
|
|
const char* p_type(int type) {
|
|
int success;
|
|
const char* result;
|
|
static char typebuf[20];
|
|
|
|
result = sym_ntos(p_type_syms, type, &success);
|
|
if (success) return (result);
|
|
if (type < 0 || type > 0xffff) return ("BADTYPE");
|
|
snprintf(typebuf, sizeof(typebuf), "TYPE%d", type);
|
|
return (typebuf);
|
|
}
|
|
|
|
/*
|
|
* Return a string for the type.
|
|
*/
|
|
const char* p_section(int section, int opcode) {
|
|
const struct res_sym* symbols;
|
|
|
|
switch (opcode) {
|
|
case ns_o_update:
|
|
symbols = p_update_section_syms;
|
|
break;
|
|
default:
|
|
symbols = p_default_section_syms;
|
|
break;
|
|
}
|
|
return (sym_ntos(symbols, section, (int*) 0));
|
|
}
|
|
|
|
/*
|
|
* Return a mnemonic for class.
|
|
*/
|
|
const char* p_class(int cl) {
|
|
int success;
|
|
const char* result;
|
|
static char classbuf[20];
|
|
|
|
result = sym_ntos(p_class_syms, cl, &success);
|
|
if (success) return (result);
|
|
if (cl < 0 || cl > 0xffff) return ("BADCLASS");
|
|
snprintf(classbuf, sizeof(classbuf), "CLASS%d", cl);
|
|
return (classbuf);
|
|
}
|
|
|
|
/*
|
|
* Return a string for the rcode.
|
|
*/
|
|
const char* p_rcode(int rcode) {
|
|
return (sym_ntos(p_rcode_syms, rcode, (int*) 0));
|
|
}
|
|
|
|
int resolv_set_log_severity(uint32_t logSeverity) {
|
|
switch (logSeverity) {
|
|
case aidl::android::net::IDnsResolver::DNS_RESOLVER_LOG_VERBOSE:
|
|
logSeverity = android::base::VERBOSE;
|
|
doh_set_log_level(DOH_LOG_LEVEL_TRACE);
|
|
// *** enable verbose logging only when DBG is set. It prints sensitive data ***
|
|
if (RESOLV_ALLOW_VERBOSE_LOGGING == false) {
|
|
logSeverity = android::base::DEBUG;
|
|
doh_set_log_level(DOH_LOG_LEVEL_DEBUG);
|
|
LOG(ERROR) << "Refusing to set VERBOSE logging in non-debuggable build";
|
|
// TODO: Return EACCES then callers could know if the log
|
|
// severity is acceptable
|
|
}
|
|
break;
|
|
case aidl::android::net::IDnsResolver::DNS_RESOLVER_LOG_DEBUG:
|
|
logSeverity = android::base::DEBUG;
|
|
doh_set_log_level(DOH_LOG_LEVEL_DEBUG);
|
|
break;
|
|
case aidl::android::net::IDnsResolver::DNS_RESOLVER_LOG_INFO:
|
|
logSeverity = android::base::INFO;
|
|
doh_set_log_level(DOH_LOG_LEVEL_INFO);
|
|
break;
|
|
case aidl::android::net::IDnsResolver::DNS_RESOLVER_LOG_WARNING:
|
|
logSeverity = android::base::WARNING;
|
|
doh_set_log_level(DOH_LOG_LEVEL_WARN);
|
|
break;
|
|
case aidl::android::net::IDnsResolver::DNS_RESOLVER_LOG_ERROR:
|
|
logSeverity = android::base::ERROR;
|
|
doh_set_log_level(DOH_LOG_LEVEL_ERROR);
|
|
break;
|
|
default:
|
|
LOG(ERROR) << __func__ << ": invalid log severity: " << logSeverity;
|
|
return -EINVAL;
|
|
}
|
|
android::base::SetMinimumLogSeverity(static_cast<android::base::LogSeverity>(logSeverity));
|
|
return 0;
|
|
}
|