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authorPeter Wemm <peter@FreeBSD.org>2008-07-12 05:47:40 +0000
committerPeter Wemm <peter@FreeBSD.org>2008-07-12 05:47:40 +0000
commita2fb3b4fea07ff46e8b265b9495d82380edfc484 (patch)
tree06bae50e9f9d87fa78e718cf3dd1669ebc994a16 /contrib/bind9/lib/dns/resolver.c
parentfa5fb0343e2347012cf980b8273e2cba6c36de4a (diff)
downloadsrc-a2fb3b4fea07ff46e8b265b9495d82380edfc484.tar.gz
src-a2fb3b4fea07ff46e8b265b9495d82380edfc484.zip
Split off the dist/ tree right before the 9.4 imports started. We can
use this as a work area for 9.3.* imports for stable branches.
Notes
Notes: svn path=/vendor/bind9/dist-9.3/; revision=180458
Diffstat (limited to 'contrib/bind9/lib/dns/resolver.c')
-rw-r--r--contrib/bind9/lib/dns/resolver.c6708
1 files changed, 0 insertions, 6708 deletions
diff --git a/contrib/bind9/lib/dns/resolver.c b/contrib/bind9/lib/dns/resolver.c
deleted file mode 100644
index a56fecfd3ce1..000000000000
--- a/contrib/bind9/lib/dns/resolver.c
+++ /dev/null
@@ -1,6708 +0,0 @@
-/*
- * Copyright (C) 2004-2006 Internet Systems Consortium, Inc. ("ISC")
- * Copyright (C) 1999-2003 Internet Software Consortium.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
- * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
- * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
- * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
- * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
- * PERFORMANCE OF THIS SOFTWARE.
- */
-
-/* $Id: resolver.c,v 1.218.2.18.4.64.4.2 2007/01/11 05:05:10 marka Exp $ */
-
-#include <config.h>
-
-#include <isc/print.h>
-#include <isc/string.h>
-#include <isc/task.h>
-#include <isc/timer.h>
-#include <isc/util.h>
-
-#include <dns/acl.h>
-#include <dns/adb.h>
-#include <dns/cache.h>
-#include <dns/db.h>
-#include <dns/dispatch.h>
-#include <dns/ds.h>
-#include <dns/events.h>
-#include <dns/forward.h>
-#include <dns/keytable.h>
-#include <dns/log.h>
-#include <dns/message.h>
-#include <dns/ncache.h>
-#include <dns/opcode.h>
-#include <dns/peer.h>
-#include <dns/rbt.h>
-#include <dns/rcode.h>
-#include <dns/rdata.h>
-#include <dns/rdataclass.h>
-#include <dns/rdatalist.h>
-#include <dns/rdataset.h>
-#include <dns/rdatastruct.h>
-#include <dns/rdatatype.h>
-#include <dns/resolver.h>
-#include <dns/result.h>
-#include <dns/rootns.h>
-#include <dns/tsig.h>
-#include <dns/validator.h>
-
-#define DNS_RESOLVER_TRACE
-#ifdef DNS_RESOLVER_TRACE
-#define RTRACE(m) isc_log_write(dns_lctx, \
- DNS_LOGCATEGORY_RESOLVER, \
- DNS_LOGMODULE_RESOLVER, \
- ISC_LOG_DEBUG(3), \
- "res %p: %s", res, (m))
-#define RRTRACE(r, m) isc_log_write(dns_lctx, \
- DNS_LOGCATEGORY_RESOLVER, \
- DNS_LOGMODULE_RESOLVER, \
- ISC_LOG_DEBUG(3), \
- "res %p: %s", (r), (m))
-#define FCTXTRACE(m) isc_log_write(dns_lctx, \
- DNS_LOGCATEGORY_RESOLVER, \
- DNS_LOGMODULE_RESOLVER, \
- ISC_LOG_DEBUG(3), \
- "fctx %p(%s'): %s", fctx, fctx->info, (m))
-#define FCTXTRACE2(m1, m2) \
- isc_log_write(dns_lctx, \
- DNS_LOGCATEGORY_RESOLVER, \
- DNS_LOGMODULE_RESOLVER, \
- ISC_LOG_DEBUG(3), \
- "fctx %p(%s): %s %s", \
- fctx, fctx->info, (m1), (m2))
-#define FTRACE(m) isc_log_write(dns_lctx, \
- DNS_LOGCATEGORY_RESOLVER, \
- DNS_LOGMODULE_RESOLVER, \
- ISC_LOG_DEBUG(3), \
- "fetch %p (fctx %p(%s)): %s", \
- fetch, fetch->private, \
- fetch->private->info, (m))
-#define QTRACE(m) isc_log_write(dns_lctx, \
- DNS_LOGCATEGORY_RESOLVER, \
- DNS_LOGMODULE_RESOLVER, \
- ISC_LOG_DEBUG(3), \
- "resquery %p (fctx %p(%s)): %s", \
- query, query->fctx, \
- query->fctx->info, (m))
-#else
-#define RTRACE(m)
-#define RRTRACE(r, m)
-#define FCTXTRACE(m)
-#define FTRACE(m)
-#define QTRACE(m)
-#endif
-
-/*
- * Maximum EDNS0 input packet size.
- */
-#define RECV_BUFFER_SIZE 4096 /* XXXRTH Constant. */
-
-/*
- * This defines the maximum number of timeouts we will permit before we
- * disable EDNS0 on the query.
- */
-#define MAX_EDNS0_TIMEOUTS 3
-
-typedef struct fetchctx fetchctx_t;
-
-typedef struct query {
- /* Locked by task event serialization. */
- unsigned int magic;
- fetchctx_t * fctx;
- isc_mem_t * mctx;
- dns_dispatchmgr_t * dispatchmgr;
- dns_dispatch_t * dispatch;
- dns_adbaddrinfo_t * addrinfo;
- isc_socket_t * tcpsocket;
- isc_time_t start;
- dns_messageid_t id;
- dns_dispentry_t * dispentry;
- ISC_LINK(struct query) link;
- isc_buffer_t buffer;
- isc_buffer_t *tsig;
- dns_tsigkey_t *tsigkey;
- unsigned int options;
- unsigned int attributes;
- unsigned int sends;
- unsigned int connects;
- unsigned char data[512];
-} resquery_t;
-
-#define QUERY_MAGIC ISC_MAGIC('Q', '!', '!', '!')
-#define VALID_QUERY(query) ISC_MAGIC_VALID(query, QUERY_MAGIC)
-
-#define RESQUERY_ATTR_CANCELED 0x02
-
-#define RESQUERY_CONNECTING(q) ((q)->connects > 0)
-#define RESQUERY_CANCELED(q) (((q)->attributes & \
- RESQUERY_ATTR_CANCELED) != 0)
-#define RESQUERY_SENDING(q) ((q)->sends > 0)
-
-typedef enum {
- fetchstate_init = 0, /* Start event has not run yet. */
- fetchstate_active,
- fetchstate_done /* FETCHDONE events posted. */
-} fetchstate;
-
-struct fetchctx {
- /* Not locked. */
- unsigned int magic;
- dns_resolver_t * res;
- dns_name_t name;
- dns_rdatatype_t type;
- unsigned int options;
- unsigned int bucketnum;
- char * info;
- /* Locked by appropriate bucket lock. */
- fetchstate state;
- isc_boolean_t want_shutdown;
- isc_boolean_t cloned;
- unsigned int references;
- isc_event_t control_event;
- ISC_LINK(struct fetchctx) link;
- ISC_LIST(dns_fetchevent_t) events;
- /* Locked by task event serialization. */
- dns_name_t domain;
- dns_rdataset_t nameservers;
- unsigned int attributes;
- isc_timer_t * timer;
- isc_time_t expires;
- isc_interval_t interval;
- dns_message_t * qmessage;
- dns_message_t * rmessage;
- ISC_LIST(resquery_t) queries;
- dns_adbfindlist_t finds;
- dns_adbfind_t * find;
- dns_adbfindlist_t altfinds;
- dns_adbfind_t * altfind;
- dns_adbaddrinfolist_t forwaddrs;
- dns_adbaddrinfolist_t altaddrs;
- isc_sockaddrlist_t forwarders;
- dns_fwdpolicy_t fwdpolicy;
- isc_sockaddrlist_t bad;
- ISC_LIST(dns_validator_t) validators;
- dns_db_t * cache;
- dns_adb_t * adb;
-
- /*
- * The number of events we're waiting for.
- */
- unsigned int pending;
-
- /*
- * The number of times we've "restarted" the current
- * nameserver set. This acts as a failsafe to prevent
- * us from pounding constantly on a particular set of
- * servers that, for whatever reason, are not giving
- * us useful responses, but are responding in such a
- * way that they are not marked "bad".
- */
- unsigned int restarts;
-
- /*
- * The number of timeouts that have occurred since we
- * last successfully received a response packet. This
- * is used for EDNS0 black hole detection.
- */
- unsigned int timeouts;
- /*
- * Look aside state for DS lookups.
- */
- dns_name_t nsname;
- dns_fetch_t * nsfetch;
- dns_rdataset_t nsrrset;
-
- /*%
- * Number of queries that reference this context.
- */
- unsigned int nqueries;
-};
-
-#define FCTX_MAGIC ISC_MAGIC('F', '!', '!', '!')
-#define VALID_FCTX(fctx) ISC_MAGIC_VALID(fctx, FCTX_MAGIC)
-
-#define FCTX_ATTR_HAVEANSWER 0x0001
-#define FCTX_ATTR_GLUING 0x0002
-#define FCTX_ATTR_ADDRWAIT 0x0004
-#define FCTX_ATTR_SHUTTINGDOWN 0x0008
-#define FCTX_ATTR_WANTCACHE 0x0010
-#define FCTX_ATTR_WANTNCACHE 0x0020
-#define FCTX_ATTR_NEEDEDNS0 0x0040
-#define FCTX_ATTR_TRIEDFIND 0x0080
-#define FCTX_ATTR_TRIEDALT 0x0100
-
-#define HAVE_ANSWER(f) (((f)->attributes & FCTX_ATTR_HAVEANSWER) != \
- 0)
-#define GLUING(f) (((f)->attributes & FCTX_ATTR_GLUING) != \
- 0)
-#define ADDRWAIT(f) (((f)->attributes & FCTX_ATTR_ADDRWAIT) != \
- 0)
-#define SHUTTINGDOWN(f) (((f)->attributes & FCTX_ATTR_SHUTTINGDOWN) \
- != 0)
-#define WANTCACHE(f) (((f)->attributes & FCTX_ATTR_WANTCACHE) != 0)
-#define WANTNCACHE(f) (((f)->attributes & FCTX_ATTR_WANTNCACHE) != 0)
-#define NEEDEDNS0(f) (((f)->attributes & FCTX_ATTR_NEEDEDNS0) != 0)
-#define TRIEDFIND(f) (((f)->attributes & FCTX_ATTR_TRIEDFIND) != 0)
-#define TRIEDALT(f) (((f)->attributes & FCTX_ATTR_TRIEDALT) != 0)
-
-typedef struct {
- dns_adbaddrinfo_t * addrinfo;
- fetchctx_t * fctx;
-} dns_valarg_t;
-
-struct dns_fetch {
- unsigned int magic;
- fetchctx_t * private;
-};
-
-#define DNS_FETCH_MAGIC ISC_MAGIC('F', 't', 'c', 'h')
-#define DNS_FETCH_VALID(fetch) ISC_MAGIC_VALID(fetch, DNS_FETCH_MAGIC)
-
-typedef struct fctxbucket {
- isc_task_t * task;
- isc_mutex_t lock;
- ISC_LIST(fetchctx_t) fctxs;
- isc_boolean_t exiting;
-} fctxbucket_t;
-
-typedef struct alternate {
- isc_boolean_t isaddress;
- union {
- isc_sockaddr_t addr;
- struct {
- dns_name_t name;
- in_port_t port;
- } _n;
- } _u;
- ISC_LINK(struct alternate) link;
-} alternate_t;
-
-struct dns_resolver {
- /* Unlocked. */
- unsigned int magic;
- isc_mem_t * mctx;
- isc_mutex_t lock;
- isc_mutex_t nlock;
- isc_mutex_t primelock;
- dns_rdataclass_t rdclass;
- isc_socketmgr_t * socketmgr;
- isc_timermgr_t * timermgr;
- isc_taskmgr_t * taskmgr;
- dns_view_t * view;
- isc_boolean_t frozen;
- unsigned int options;
- dns_dispatchmgr_t * dispatchmgr;
- dns_dispatch_t * dispatchv4;
- dns_dispatch_t * dispatchv6;
- unsigned int nbuckets;
- fctxbucket_t * buckets;
- isc_uint32_t lame_ttl;
- ISC_LIST(alternate_t) alternates;
- isc_uint16_t udpsize;
-#if USE_ALGLOCK
- isc_rwlock_t alglock;
-#endif
- dns_rbt_t * algorithms;
-#if USE_MBSLOCK
- isc_rwlock_t mbslock;
-#endif
- dns_rbt_t * mustbesecure;
- /* Locked by lock. */
- unsigned int references;
- isc_boolean_t exiting;
- isc_eventlist_t whenshutdown;
- unsigned int activebuckets;
- isc_boolean_t priming;
- /* Locked by primelock. */
- dns_fetch_t * primefetch;
- /* Locked by nlock. */
- unsigned int nfctx;
-};
-
-#define RES_MAGIC ISC_MAGIC('R', 'e', 's', '!')
-#define VALID_RESOLVER(res) ISC_MAGIC_VALID(res, RES_MAGIC)
-
-/*
- * Private addrinfo flags. These must not conflict with DNS_FETCHOPT_NOEDNS0,
- * which we also use as an addrinfo flag.
- */
-#define FCTX_ADDRINFO_MARK 0x0001
-#define FCTX_ADDRINFO_FORWARDER 0x1000
-#define UNMARKED(a) (((a)->flags & FCTX_ADDRINFO_MARK) \
- == 0)
-#define ISFORWARDER(a) (((a)->flags & \
- FCTX_ADDRINFO_FORWARDER) != 0)
-
-#define NXDOMAIN(r) (((r)->attributes & DNS_RDATASETATTR_NXDOMAIN) != 0)
-
-static void destroy(dns_resolver_t *res);
-static void empty_bucket(dns_resolver_t *res);
-static isc_result_t resquery_send(resquery_t *query);
-static void resquery_response(isc_task_t *task, isc_event_t *event);
-static void resquery_connected(isc_task_t *task, isc_event_t *event);
-static void fctx_try(fetchctx_t *fctx);
-static isc_boolean_t fctx_destroy(fetchctx_t *fctx);
-static isc_result_t ncache_adderesult(dns_message_t *message,
- dns_db_t *cache, dns_dbnode_t *node,
- dns_rdatatype_t covers,
- isc_stdtime_t now, dns_ttl_t maxttl,
- dns_rdataset_t *ardataset,
- isc_result_t *eresultp);
-static void validated(isc_task_t *task, isc_event_t *event);
-static void maybe_destroy(fetchctx_t *fctx);
-
-static isc_result_t
-valcreate(fetchctx_t *fctx, dns_adbaddrinfo_t *addrinfo, dns_name_t *name,
- dns_rdatatype_t type, dns_rdataset_t *rdataset,
- dns_rdataset_t *sigrdataset, unsigned int valoptions,
- isc_task_t *task)
-{
- dns_validator_t *validator = NULL;
- dns_valarg_t *valarg;
- isc_result_t result;
-
- valarg = isc_mem_get(fctx->res->mctx, sizeof(*valarg));
- if (valarg == NULL)
- return (ISC_R_NOMEMORY);
-
- valarg->fctx = fctx;
- valarg->addrinfo = addrinfo;
-
- if (!ISC_LIST_EMPTY(fctx->validators))
- INSIST((valoptions & DNS_VALIDATOR_DEFER) != 0);
-
- result = dns_validator_create(fctx->res->view, name, type, rdataset,
- sigrdataset, fctx->rmessage,
- valoptions, task, validated, valarg,
- &validator);
- if (result == ISC_R_SUCCESS)
- ISC_LIST_APPEND(fctx->validators, validator, link);
- else
- isc_mem_put(fctx->res->mctx, valarg, sizeof(*valarg));
- return (result);
-}
-
-static isc_boolean_t
-fix_mustbedelegationornxdomain(dns_message_t *message, fetchctx_t *fctx) {
- dns_name_t *name;
- dns_name_t *domain = &fctx->domain;
- dns_rdataset_t *rdataset;
- dns_rdatatype_t type;
- isc_result_t result;
- isc_boolean_t keep_auth = ISC_FALSE;
-
- if (message->rcode == dns_rcode_nxdomain)
- return (ISC_FALSE);
-
- /*
- * Look for BIND 8 style delegations.
- * Also look for answers to ANY queries where the duplicate NS RRset
- * may have been stripped from the authority section.
- */
- if (message->counts[DNS_SECTION_ANSWER] != 0 &&
- (fctx->type == dns_rdatatype_ns ||
- fctx->type == dns_rdatatype_any)) {
- result = dns_message_firstname(message, DNS_SECTION_ANSWER);
- while (result == ISC_R_SUCCESS) {
- name = NULL;
- dns_message_currentname(message, DNS_SECTION_ANSWER,
- &name);
- for (rdataset = ISC_LIST_HEAD(name->list);
- rdataset != NULL;
- rdataset = ISC_LIST_NEXT(rdataset, link)) {
- type = rdataset->type;
- if (type != dns_rdatatype_ns)
- continue;
- if (dns_name_issubdomain(name, domain))
- return (ISC_FALSE);
- }
- result = dns_message_nextname(message,
- DNS_SECTION_ANSWER);
- }
- }
-
- /* Look for referral. */
- if (message->counts[DNS_SECTION_AUTHORITY] == 0)
- goto munge;
-
- result = dns_message_firstname(message, DNS_SECTION_AUTHORITY);
- while (result == ISC_R_SUCCESS) {
- name = NULL;
- dns_message_currentname(message, DNS_SECTION_AUTHORITY, &name);
- for (rdataset = ISC_LIST_HEAD(name->list);
- rdataset != NULL;
- rdataset = ISC_LIST_NEXT(rdataset, link)) {
- type = rdataset->type;
- if (type == dns_rdatatype_soa &&
- dns_name_equal(name, domain))
- keep_auth = ISC_TRUE;
- if (type != dns_rdatatype_ns &&
- type != dns_rdatatype_soa)
- continue;
- if (dns_name_equal(name, domain))
- goto munge;
- if (dns_name_issubdomain(name, domain))
- return (ISC_FALSE);
- }
- result = dns_message_nextname(message, DNS_SECTION_AUTHORITY);
- }
-
- munge:
- message->rcode = dns_rcode_nxdomain;
- message->counts[DNS_SECTION_ANSWER] = 0;
- if (!keep_auth)
- message->counts[DNS_SECTION_AUTHORITY] = 0;
- message->counts[DNS_SECTION_ADDITIONAL] = 0;
- return (ISC_TRUE);
-}
-
-static inline isc_result_t
-fctx_starttimer(fetchctx_t *fctx) {
- /*
- * Start the lifetime timer for fctx.
- *
- * This is also used for stopping the idle timer; in that
- * case we must purge events already posted to ensure that
- * no further idle events are delivered.
- */
- return (isc_timer_reset(fctx->timer, isc_timertype_once,
- &fctx->expires, NULL, ISC_TRUE));
-}
-
-static inline void
-fctx_stoptimer(fetchctx_t *fctx) {
- isc_result_t result;
-
- /*
- * We don't return a result if resetting the timer to inactive fails
- * since there's nothing to be done about it. Resetting to inactive
- * should never fail anyway, since the code as currently written
- * cannot fail in that case.
- */
- result = isc_timer_reset(fctx->timer, isc_timertype_inactive,
- NULL, NULL, ISC_TRUE);
- if (result != ISC_R_SUCCESS) {
- UNEXPECTED_ERROR(__FILE__, __LINE__,
- "isc_timer_reset(): %s",
- isc_result_totext(result));
- }
-}
-
-
-static inline isc_result_t
-fctx_startidletimer(fetchctx_t *fctx) {
- /*
- * Start the idle timer for fctx. The lifetime timer continues
- * to be in effect.
- */
- return (isc_timer_reset(fctx->timer, isc_timertype_once,
- &fctx->expires, &fctx->interval,
- ISC_FALSE));
-}
-
-/*
- * Stopping the idle timer is equivalent to calling fctx_starttimer(), but
- * we use fctx_stopidletimer for readability in the code below.
- */
-#define fctx_stopidletimer fctx_starttimer
-
-
-static inline void
-resquery_destroy(resquery_t **queryp) {
- resquery_t *query;
-
- REQUIRE(queryp != NULL);
- query = *queryp;
- REQUIRE(!ISC_LINK_LINKED(query, link));
-
- INSIST(query->tcpsocket == NULL);
-
- query->fctx->nqueries--;
- if (SHUTTINGDOWN(query->fctx))
- maybe_destroy(query->fctx); /* Locks bucket. */
- query->magic = 0;
- isc_mem_put(query->mctx, query, sizeof(*query));
- *queryp = NULL;
-}
-
-static void
-fctx_cancelquery(resquery_t **queryp, dns_dispatchevent_t **deventp,
- isc_time_t *finish, isc_boolean_t no_response)
-{
- fetchctx_t *fctx;
- resquery_t *query;
- unsigned int rtt;
- unsigned int factor;
- dns_adbfind_t *find;
- dns_adbaddrinfo_t *addrinfo;
-
- query = *queryp;
- fctx = query->fctx;
-
- FCTXTRACE("cancelquery");
-
- REQUIRE(!RESQUERY_CANCELED(query));
-
- query->attributes |= RESQUERY_ATTR_CANCELED;
-
- /*
- * Should we update the RTT?
- */
- if (finish != NULL || no_response) {
- if (finish != NULL) {
- /*
- * We have both the start and finish times for this
- * packet, so we can compute a real RTT.
- */
- rtt = (unsigned int)isc_time_microdiff(finish,
- &query->start);
- factor = DNS_ADB_RTTADJDEFAULT;
- } else {
- /*
- * We don't have an RTT for this query. Maybe the
- * packet was lost, or maybe this server is very
- * slow. We don't know. Increase the RTT.
- */
- INSIST(no_response);
- rtt = query->addrinfo->srtt +
- (200000 * fctx->restarts);
- if (rtt > 10000000)
- rtt = 10000000;
- /*
- * Replace the current RTT with our value.
- */
- factor = DNS_ADB_RTTADJREPLACE;
- }
- dns_adb_adjustsrtt(fctx->adb, query->addrinfo, rtt, factor);
- }
-
- /*
- * Age RTTs of servers not tried.
- */
- factor = DNS_ADB_RTTADJAGE;
- if (finish != NULL)
- for (addrinfo = ISC_LIST_HEAD(fctx->forwaddrs);
- addrinfo != NULL;
- addrinfo = ISC_LIST_NEXT(addrinfo, publink))
- if (UNMARKED(addrinfo))
- dns_adb_adjustsrtt(fctx->adb, addrinfo,
- 0, factor);
-
- if (finish != NULL && TRIEDFIND(fctx))
- for (find = ISC_LIST_HEAD(fctx->finds);
- find != NULL;
- find = ISC_LIST_NEXT(find, publink))
- for (addrinfo = ISC_LIST_HEAD(find->list);
- addrinfo != NULL;
- addrinfo = ISC_LIST_NEXT(addrinfo, publink))
- if (UNMARKED(addrinfo))
- dns_adb_adjustsrtt(fctx->adb, addrinfo,
- 0, factor);
-
- if (finish != NULL && TRIEDALT(fctx)) {
- for (addrinfo = ISC_LIST_HEAD(fctx->altaddrs);
- addrinfo != NULL;
- addrinfo = ISC_LIST_NEXT(addrinfo, publink))
- if (UNMARKED(addrinfo))
- dns_adb_adjustsrtt(fctx->adb, addrinfo,
- 0, factor);
- for (find = ISC_LIST_HEAD(fctx->altfinds);
- find != NULL;
- find = ISC_LIST_NEXT(find, publink))
- for (addrinfo = ISC_LIST_HEAD(find->list);
- addrinfo != NULL;
- addrinfo = ISC_LIST_NEXT(addrinfo, publink))
- if (UNMARKED(addrinfo))
- dns_adb_adjustsrtt(fctx->adb, addrinfo,
- 0, factor);
- }
-
- if (query->dispentry != NULL)
- dns_dispatch_removeresponse(&query->dispentry, deventp);
-
- ISC_LIST_UNLINK(fctx->queries, query, link);
-
- if (query->tsig != NULL)
- isc_buffer_free(&query->tsig);
-
- if (query->tsigkey != NULL)
- dns_tsigkey_detach(&query->tsigkey);
-
- /*
- * Check for any outstanding socket events. If they exist, cancel
- * them and let the event handlers finish the cleanup. The resolver
- * only needs to worry about managing the connect and send events;
- * the dispatcher manages the recv events.
- */
- if (RESQUERY_CONNECTING(query))
- /*
- * Cancel the connect.
- */
- isc_socket_cancel(query->tcpsocket, NULL,
- ISC_SOCKCANCEL_CONNECT);
- else if (RESQUERY_SENDING(query))
- /*
- * Cancel the pending send.
- */
- isc_socket_cancel(dns_dispatch_getsocket(query->dispatch),
- NULL, ISC_SOCKCANCEL_SEND);
-
- if (query->dispatch != NULL)
- dns_dispatch_detach(&query->dispatch);
-
- if (! (RESQUERY_CONNECTING(query) || RESQUERY_SENDING(query)))
- /*
- * It's safe to destroy the query now.
- */
- resquery_destroy(&query);
-}
-
-static void
-fctx_cancelqueries(fetchctx_t *fctx, isc_boolean_t no_response) {
- resquery_t *query, *next_query;
-
- FCTXTRACE("cancelqueries");
-
- for (query = ISC_LIST_HEAD(fctx->queries);
- query != NULL;
- query = next_query) {
- next_query = ISC_LIST_NEXT(query, link);
- fctx_cancelquery(&query, NULL, NULL, no_response);
- }
-}
-
-static void
-fctx_cleanupfinds(fetchctx_t *fctx) {
- dns_adbfind_t *find, *next_find;
-
- REQUIRE(ISC_LIST_EMPTY(fctx->queries));
-
- for (find = ISC_LIST_HEAD(fctx->finds);
- find != NULL;
- find = next_find) {
- next_find = ISC_LIST_NEXT(find, publink);
- ISC_LIST_UNLINK(fctx->finds, find, publink);
- dns_adb_destroyfind(&find);
- }
- fctx->find = NULL;
-}
-
-static void
-fctx_cleanupaltfinds(fetchctx_t *fctx) {
- dns_adbfind_t *find, *next_find;
-
- REQUIRE(ISC_LIST_EMPTY(fctx->queries));
-
- for (find = ISC_LIST_HEAD(fctx->altfinds);
- find != NULL;
- find = next_find) {
- next_find = ISC_LIST_NEXT(find, publink);
- ISC_LIST_UNLINK(fctx->altfinds, find, publink);
- dns_adb_destroyfind(&find);
- }
- fctx->altfind = NULL;
-}
-
-static void
-fctx_cleanupforwaddrs(fetchctx_t *fctx) {
- dns_adbaddrinfo_t *addr, *next_addr;
-
- REQUIRE(ISC_LIST_EMPTY(fctx->queries));
-
- for (addr = ISC_LIST_HEAD(fctx->forwaddrs);
- addr != NULL;
- addr = next_addr) {
- next_addr = ISC_LIST_NEXT(addr, publink);
- ISC_LIST_UNLINK(fctx->forwaddrs, addr, publink);
- dns_adb_freeaddrinfo(fctx->adb, &addr);
- }
-}
-
-static void
-fctx_cleanupaltaddrs(fetchctx_t *fctx) {
- dns_adbaddrinfo_t *addr, *next_addr;
-
- REQUIRE(ISC_LIST_EMPTY(fctx->queries));
-
- for (addr = ISC_LIST_HEAD(fctx->altaddrs);
- addr != NULL;
- addr = next_addr) {
- next_addr = ISC_LIST_NEXT(addr, publink);
- ISC_LIST_UNLINK(fctx->altaddrs, addr, publink);
- dns_adb_freeaddrinfo(fctx->adb, &addr);
- }
-}
-
-static inline void
-fctx_stopeverything(fetchctx_t *fctx, isc_boolean_t no_response) {
- FCTXTRACE("stopeverything");
- fctx_cancelqueries(fctx, no_response);
- fctx_cleanupfinds(fctx);
- fctx_cleanupaltfinds(fctx);
- fctx_cleanupforwaddrs(fctx);
- fctx_cleanupaltaddrs(fctx);
- fctx_stoptimer(fctx);
-}
-
-static inline void
-fctx_sendevents(fetchctx_t *fctx, isc_result_t result) {
- dns_fetchevent_t *event, *next_event;
- isc_task_t *task;
-
- /*
- * Caller must be holding the appropriate bucket lock.
- */
- REQUIRE(fctx->state == fetchstate_done);
-
- FCTXTRACE("sendevents");
-
- for (event = ISC_LIST_HEAD(fctx->events);
- event != NULL;
- event = next_event) {
- next_event = ISC_LIST_NEXT(event, ev_link);
- ISC_LIST_UNLINK(fctx->events, event, ev_link);
- task = event->ev_sender;
- event->ev_sender = fctx;
- if (!HAVE_ANSWER(fctx))
- event->result = result;
-
- INSIST(result != ISC_R_SUCCESS ||
- dns_rdataset_isassociated(event->rdataset) ||
- fctx->type == dns_rdatatype_any ||
- fctx->type == dns_rdatatype_rrsig ||
- fctx->type == dns_rdatatype_sig);
-
- isc_task_sendanddetach(&task, ISC_EVENT_PTR(&event));
- }
-}
-
-static void
-fctx_done(fetchctx_t *fctx, isc_result_t result) {
- dns_resolver_t *res;
- isc_boolean_t no_response;
-
- FCTXTRACE("done");
-
- res = fctx->res;
-
- if (result == ISC_R_SUCCESS)
- no_response = ISC_TRUE;
- else
- no_response = ISC_FALSE;
- fctx_stopeverything(fctx, no_response);
-
- LOCK(&res->buckets[fctx->bucketnum].lock);
-
- fctx->state = fetchstate_done;
- fctx->attributes &= ~FCTX_ATTR_ADDRWAIT;
- fctx_sendevents(fctx, result);
-
- UNLOCK(&res->buckets[fctx->bucketnum].lock);
-}
-
-static void
-resquery_senddone(isc_task_t *task, isc_event_t *event) {
- isc_socketevent_t *sevent = (isc_socketevent_t *)event;
- resquery_t *query = event->ev_arg;
- isc_boolean_t retry = ISC_FALSE;
- isc_result_t result;
- fetchctx_t *fctx;
-
- REQUIRE(event->ev_type == ISC_SOCKEVENT_SENDDONE);
-
- QTRACE("senddone");
-
- /*
- * XXXRTH
- *
- * Currently we don't wait for the senddone event before retrying
- * a query. This means that if we get really behind, we may end
- * up doing extra work!
- */
-
- UNUSED(task);
-
- INSIST(RESQUERY_SENDING(query));
-
- query->sends--;
- fctx = query->fctx;
-
- if (RESQUERY_CANCELED(query)) {
- if (query->sends == 0) {
- /*
- * This query was canceled while the
- * isc_socket_sendto() was in progress.
- */
- if (query->tcpsocket != NULL)
- isc_socket_detach(&query->tcpsocket);
- resquery_destroy(&query);
- }
- } else
- switch (sevent->result) {
- case ISC_R_SUCCESS:
- break;
-
- case ISC_R_HOSTUNREACH:
- case ISC_R_NETUNREACH:
- case ISC_R_NOPERM:
- case ISC_R_ADDRNOTAVAIL:
- case ISC_R_CONNREFUSED:
-
- /*
- * No route to remote.
- */
- fctx_cancelquery(&query, NULL, NULL, ISC_TRUE);
- retry = ISC_TRUE;
- break;
-
- default:
- fctx_cancelquery(&query, NULL, NULL, ISC_FALSE);
- break;
- }
-
- isc_event_free(&event);
-
- if (retry) {
- /*
- * Behave as if the idle timer has expired. For TCP
- * this may not actually reflect the latest timer.
- */
- fctx->attributes &= ~FCTX_ATTR_ADDRWAIT;
- result = fctx_stopidletimer(fctx);
- if (result != ISC_R_SUCCESS)
- fctx_done(fctx, result);
- else
- fctx_try(fctx);
- }
-}
-
-static inline isc_result_t
-fctx_addopt(dns_message_t *message, dns_resolver_t *res) {
- dns_rdataset_t *rdataset;
- dns_rdatalist_t *rdatalist;
- dns_rdata_t *rdata;
- isc_result_t result;
-
- rdatalist = NULL;
- result = dns_message_gettemprdatalist(message, &rdatalist);
- if (result != ISC_R_SUCCESS)
- return (result);
- rdata = NULL;
- result = dns_message_gettemprdata(message, &rdata);
- if (result != ISC_R_SUCCESS)
- return (result);
- rdataset = NULL;
- result = dns_message_gettemprdataset(message, &rdataset);
- if (result != ISC_R_SUCCESS)
- return (result);
- dns_rdataset_init(rdataset);
-
- rdatalist->type = dns_rdatatype_opt;
- rdatalist->covers = 0;
-
- /*
- * Set Maximum UDP buffer size.
- */
- rdatalist->rdclass = res->udpsize;
-
- /*
- * Set EXTENDED-RCODE, VERSION, and Z to 0, and the DO bit to 1.
- */
- rdatalist->ttl = DNS_MESSAGEEXTFLAG_DO;
-
- /*
- * No EDNS options.
- */
- rdata->data = NULL;
- rdata->length = 0;
- rdata->rdclass = rdatalist->rdclass;
- rdata->type = rdatalist->type;
- rdata->flags = 0;
-
- ISC_LIST_INIT(rdatalist->rdata);
- ISC_LIST_APPEND(rdatalist->rdata, rdata, link);
- RUNTIME_CHECK(dns_rdatalist_tordataset(rdatalist, rdataset) == ISC_R_SUCCESS);
-
- return (dns_message_setopt(message, rdataset));
-}
-
-static inline void
-fctx_setretryinterval(fetchctx_t *fctx, unsigned int rtt) {
- unsigned int seconds;
-
- /*
- * We retry every 2 seconds the first two times through the address
- * list, and then we do exponential back-off.
- */
- if (fctx->restarts < 3)
- seconds = 2;
- else
- seconds = (2 << (fctx->restarts - 1));
-
- /*
- * Double the round-trip time and convert to seconds.
- */
- rtt /= 500000;
-
- /*
- * Always wait for at least the doubled round-trip time.
- */
- if (seconds < rtt)
- seconds = rtt;
-
- /*
- * But don't ever wait for more than 30 seconds.
- */
- if (seconds > 30)
- seconds = 30;
-
- isc_interval_set(&fctx->interval, seconds, 0);
-}
-
-static isc_result_t
-fctx_query(fetchctx_t *fctx, dns_adbaddrinfo_t *addrinfo,
- unsigned int options)
-{
- dns_resolver_t *res;
- isc_task_t *task;
- isc_result_t result;
- resquery_t *query;
-
- FCTXTRACE("query");
-
- res = fctx->res;
- task = res->buckets[fctx->bucketnum].task;
-
- fctx_setretryinterval(fctx, addrinfo->srtt);
- result = fctx_startidletimer(fctx);
- if (result != ISC_R_SUCCESS)
- return (result);
-
- INSIST(ISC_LIST_EMPTY(fctx->validators));
-
- dns_message_reset(fctx->rmessage, DNS_MESSAGE_INTENTPARSE);
-
- query = isc_mem_get(res->mctx, sizeof(*query));
- if (query == NULL) {
- result = ISC_R_NOMEMORY;
- goto stop_idle_timer;
- }
- query->mctx = res->mctx;
- query->options = options;
- query->attributes = 0;
- query->sends = 0;
- query->connects = 0;
- /*
- * Note that the caller MUST guarantee that 'addrinfo' will remain
- * valid until this query is canceled.
- */
- query->addrinfo = addrinfo;
- TIME_NOW(&query->start);
-
- /*
- * If this is a TCP query, then we need to make a socket and
- * a dispatch for it here. Otherwise we use the resolver's
- * shared dispatch.
- */
- query->dispatchmgr = res->dispatchmgr;
- query->dispatch = NULL;
- query->tcpsocket = NULL;
- if ((query->options & DNS_FETCHOPT_TCP) != 0) {
- isc_sockaddr_t addr;
- int pf;
-
- pf = isc_sockaddr_pf(&addrinfo->sockaddr);
-
- switch (pf) {
- case PF_INET:
- result = dns_dispatch_getlocaladdress(res->dispatchv4,
- &addr);
- break;
- case PF_INET6:
- result = dns_dispatch_getlocaladdress(res->dispatchv6,
- &addr);
- break;
- default:
- result = ISC_R_NOTIMPLEMENTED;
- break;
- }
- if (result != ISC_R_SUCCESS)
- goto cleanup_query;
-
- isc_sockaddr_setport(&addr, 0);
-
- result = isc_socket_create(res->socketmgr, pf,
- isc_sockettype_tcp,
- &query->tcpsocket);
- if (result != ISC_R_SUCCESS)
- goto cleanup_query;
-
-#ifndef BROKEN_TCP_BIND_BEFORE_CONNECT
- result = isc_socket_bind(query->tcpsocket, &addr);
- if (result != ISC_R_SUCCESS)
- goto cleanup_socket;
-#endif
-
- /*
- * A dispatch will be created once the connect succeeds.
- */
- } else {
- switch (isc_sockaddr_pf(&addrinfo->sockaddr)) {
- case PF_INET:
- dns_dispatch_attach(res->dispatchv4, &query->dispatch);
- break;
- case PF_INET6:
- dns_dispatch_attach(res->dispatchv6, &query->dispatch);
- break;
- default:
- result = ISC_R_NOTIMPLEMENTED;
- goto cleanup_query;
- }
- /*
- * We should always have a valid dispatcher here. If we
- * don't support a protocol family, then its dispatcher
- * will be NULL, but we shouldn't be finding addresses for
- * protocol types we don't support, so the dispatcher
- * we found should never be NULL.
- */
- INSIST(query->dispatch != NULL);
- }
-
- query->dispentry = NULL;
- query->fctx = fctx;
- query->tsig = NULL;
- query->tsigkey = NULL;
- ISC_LINK_INIT(query, link);
- query->magic = QUERY_MAGIC;
-
- if ((query->options & DNS_FETCHOPT_TCP) != 0) {
- /*
- * Connect to the remote server.
- *
- * XXXRTH Should we attach to the socket?
- */
- result = isc_socket_connect(query->tcpsocket,
- &addrinfo->sockaddr, task,
- resquery_connected, query);
- if (result != ISC_R_SUCCESS)
- goto cleanup_socket;
- query->connects++;
- QTRACE("connecting via TCP");
- } else {
- result = resquery_send(query);
- if (result != ISC_R_SUCCESS)
- goto cleanup_dispatch;
- }
-
- ISC_LIST_APPEND(fctx->queries, query, link);
- query->fctx->nqueries++;
-
- return (ISC_R_SUCCESS);
-
- cleanup_socket:
- isc_socket_detach(&query->tcpsocket);
-
- cleanup_dispatch:
- if (query->dispatch != NULL)
- dns_dispatch_detach(&query->dispatch);
-
- cleanup_query:
- query->magic = 0;
- isc_mem_put(res->mctx, query, sizeof(*query));
-
- stop_idle_timer:
- RUNTIME_CHECK(fctx_stopidletimer(fctx) == ISC_R_SUCCESS);
-
- return (result);
-}
-
-static isc_result_t
-resquery_send(resquery_t *query) {
- fetchctx_t *fctx;
- isc_result_t result;
- dns_name_t *qname = NULL;
- dns_rdataset_t *qrdataset = NULL;
- isc_region_t r;
- dns_resolver_t *res;
- isc_task_t *task;
- isc_socket_t *socket;
- isc_buffer_t tcpbuffer;
- isc_sockaddr_t *address;
- isc_buffer_t *buffer;
- isc_netaddr_t ipaddr;
- dns_tsigkey_t *tsigkey = NULL;
- dns_peer_t *peer = NULL;
- isc_boolean_t useedns;
- dns_compress_t cctx;
- isc_boolean_t cleanup_cctx = ISC_FALSE;
- isc_boolean_t secure_domain;
-
- fctx = query->fctx;
- QTRACE("send");
-
- res = fctx->res;
- task = res->buckets[fctx->bucketnum].task;
- address = NULL;
-
- if ((query->options & DNS_FETCHOPT_TCP) != 0) {
- /*
- * Reserve space for the TCP message length.
- */
- isc_buffer_init(&tcpbuffer, query->data, sizeof(query->data));
- isc_buffer_init(&query->buffer, query->data + 2,
- sizeof(query->data) - 2);
- buffer = &tcpbuffer;
- } else {
- isc_buffer_init(&query->buffer, query->data,
- sizeof(query->data));
- buffer = &query->buffer;
- }
-
- result = dns_message_gettempname(fctx->qmessage, &qname);
- if (result != ISC_R_SUCCESS)
- goto cleanup_temps;
- result = dns_message_gettemprdataset(fctx->qmessage, &qrdataset);
- if (result != ISC_R_SUCCESS)
- goto cleanup_temps;
-
- /*
- * Get a query id from the dispatch.
- */
- result = dns_dispatch_addresponse(query->dispatch,
- &query->addrinfo->sockaddr,
- task,
- resquery_response,
- query,
- &query->id,
- &query->dispentry);
- if (result != ISC_R_SUCCESS)
- goto cleanup_temps;
-
- fctx->qmessage->opcode = dns_opcode_query;
-
- /*
- * Set up question.
- */
- dns_name_init(qname, NULL);
- dns_name_clone(&fctx->name, qname);
- dns_rdataset_init(qrdataset);
- dns_rdataset_makequestion(qrdataset, res->rdclass, fctx->type);
- ISC_LIST_APPEND(qname->list, qrdataset, link);
- dns_message_addname(fctx->qmessage, qname, DNS_SECTION_QUESTION);
- qname = NULL;
- qrdataset = NULL;
-
- /*
- * Set RD if the client has requested that we do a recursive query,
- * or if we're sending to a forwarder.
- */
- if ((query->options & DNS_FETCHOPT_RECURSIVE) != 0 ||
- ISFORWARDER(query->addrinfo))
- fctx->qmessage->flags |= DNS_MESSAGEFLAG_RD;
-
- /*
- * Set CD if the client says don't validate or the question is
- * under a secure entry point.
- */
- if ((query->options & DNS_FETCHOPT_NOVALIDATE) == 0) {
- result = dns_keytable_issecuredomain(res->view->secroots,
- &fctx->name,
- &secure_domain);
- if (result != ISC_R_SUCCESS)
- secure_domain = ISC_FALSE;
- if (res->view->dlv != NULL)
- secure_domain = ISC_TRUE;
- if (secure_domain)
- fctx->qmessage->flags |= DNS_MESSAGEFLAG_CD;
- } else
- fctx->qmessage->flags |= DNS_MESSAGEFLAG_CD;
-
- /*
- * We don't have to set opcode because it defaults to query.
- */
- fctx->qmessage->id = query->id;
-
- /*
- * Convert the question to wire format.
- */
- result = dns_compress_init(&cctx, -1, fctx->res->mctx);
- if (result != ISC_R_SUCCESS)
- goto cleanup_message;
- cleanup_cctx = ISC_TRUE;
-
- result = dns_message_renderbegin(fctx->qmessage, &cctx,
- &query->buffer);
- if (result != ISC_R_SUCCESS)
- goto cleanup_message;
-
- result = dns_message_rendersection(fctx->qmessage,
- DNS_SECTION_QUESTION, 0);
- if (result != ISC_R_SUCCESS)
- goto cleanup_message;
-
- peer = NULL;
- isc_netaddr_fromsockaddr(&ipaddr, &query->addrinfo->sockaddr);
- (void) dns_peerlist_peerbyaddr(fctx->res->view->peers, &ipaddr, &peer);
-
- /*
- * The ADB does not know about servers with "edns no". Check this,
- * and then inform the ADB for future use.
- */
- if ((query->addrinfo->flags & DNS_FETCHOPT_NOEDNS0) == 0 &&
- peer != NULL &&
- dns_peer_getsupportedns(peer, &useedns) == ISC_R_SUCCESS &&
- !useedns)
- {
- query->options |= DNS_FETCHOPT_NOEDNS0;
- dns_adb_changeflags(fctx->adb,
- query->addrinfo,
- DNS_FETCHOPT_NOEDNS0,
- DNS_FETCHOPT_NOEDNS0);
- }
-
- /*
- * Use EDNS0, unless the caller doesn't want it, or we know that
- * the remote server doesn't like it.
- */
- if (fctx->timeouts >= MAX_EDNS0_TIMEOUTS &&
- (query->options & DNS_FETCHOPT_NOEDNS0) == 0) {
- query->options |= DNS_FETCHOPT_NOEDNS0;
- FCTXTRACE("too many timeouts, disabling EDNS0");
- }
-
- if ((query->options & DNS_FETCHOPT_NOEDNS0) == 0) {
- if ((query->addrinfo->flags & DNS_FETCHOPT_NOEDNS0) == 0) {
- result = fctx_addopt(fctx->qmessage, res);
- if (result != ISC_R_SUCCESS) {
- /*
- * We couldn't add the OPT, but we'll press on.
- * We're not using EDNS0, so set the NOEDNS0
- * bit.
- */
- query->options |= DNS_FETCHOPT_NOEDNS0;
- }
- } else {
- /*
- * We know this server doesn't like EDNS0, so we
- * won't use it. Set the NOEDNS0 bit since we're
- * not using EDNS0.
- */
- query->options |= DNS_FETCHOPT_NOEDNS0;
- }
- }
-
- /*
- * If we need EDNS0 to do this query and aren't using it, we lose.
- */
- if (NEEDEDNS0(fctx) && (query->options & DNS_FETCHOPT_NOEDNS0) != 0) {
- result = DNS_R_SERVFAIL;
- goto cleanup_message;
- }
-
- /*
- * Clear CD if EDNS is not in use.
- */
- if ((query->options & DNS_FETCHOPT_NOEDNS0) != 0)
- fctx->qmessage->flags &= ~DNS_MESSAGEFLAG_CD;
-
- /*
- * Add TSIG record tailored to the current recipient.
- */
- result = dns_view_getpeertsig(fctx->res->view, &ipaddr, &tsigkey);
- if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND)
- goto cleanup_message;
-
- if (tsigkey != NULL) {
- result = dns_message_settsigkey(fctx->qmessage, tsigkey);
- dns_tsigkey_detach(&tsigkey);
- if (result != ISC_R_SUCCESS)
- goto cleanup_message;
- }
-
- result = dns_message_rendersection(fctx->qmessage,
- DNS_SECTION_ADDITIONAL, 0);
- if (result != ISC_R_SUCCESS)
- goto cleanup_message;
-
- result = dns_message_renderend(fctx->qmessage);
- if (result != ISC_R_SUCCESS)
- goto cleanup_message;
-
- dns_compress_invalidate(&cctx);
- cleanup_cctx = ISC_FALSE;
-
- if (dns_message_gettsigkey(fctx->qmessage) != NULL) {
- dns_tsigkey_attach(dns_message_gettsigkey(fctx->qmessage),
- &query->tsigkey);
- result = dns_message_getquerytsig(fctx->qmessage,
- fctx->res->mctx,
- &query->tsig);
- if (result != ISC_R_SUCCESS)
- goto cleanup_message;
- }
-
- /*
- * If using TCP, write the length of the message at the beginning
- * of the buffer.
- */
- if ((query->options & DNS_FETCHOPT_TCP) != 0) {
- isc_buffer_usedregion(&query->buffer, &r);
- isc_buffer_putuint16(&tcpbuffer, (isc_uint16_t)r.length);
- isc_buffer_add(&tcpbuffer, r.length);
- }
-
- /*
- * We're now done with the query message.
- */
- dns_message_reset(fctx->qmessage, DNS_MESSAGE_INTENTRENDER);
-
- socket = dns_dispatch_getsocket(query->dispatch);
- /*
- * Send the query!
- */
- if ((query->options & DNS_FETCHOPT_TCP) == 0)
- address = &query->addrinfo->sockaddr;
- isc_buffer_usedregion(buffer, &r);
-
- /*
- * XXXRTH Make sure we don't send to ourselves! We should probably
- * prune out these addresses when we get them from the ADB.
- */
- result = isc_socket_sendto(socket, &r, task, resquery_senddone,
- query, address, NULL);
- if (result != ISC_R_SUCCESS)
- goto cleanup_message;
- query->sends++;
- QTRACE("sent");
-
- return (ISC_R_SUCCESS);
-
- cleanup_message:
- if (cleanup_cctx)
- dns_compress_invalidate(&cctx);
-
- dns_message_reset(fctx->qmessage, DNS_MESSAGE_INTENTRENDER);
-
- /*
- * Stop the dispatcher from listening.
- */
- dns_dispatch_removeresponse(&query->dispentry, NULL);
-
- cleanup_temps:
- if (qname != NULL)
- dns_message_puttempname(fctx->qmessage, &qname);
- if (qrdataset != NULL)
- dns_message_puttemprdataset(fctx->qmessage, &qrdataset);
-
- return (result);
-}
-
-static void
-resquery_connected(isc_task_t *task, isc_event_t *event) {
- isc_socketevent_t *sevent = (isc_socketevent_t *)event;
- resquery_t *query = event->ev_arg;
- isc_boolean_t retry = ISC_FALSE;
- isc_result_t result;
- unsigned int attrs;
- fetchctx_t *fctx;
-
- REQUIRE(event->ev_type == ISC_SOCKEVENT_CONNECT);
- REQUIRE(VALID_QUERY(query));
-
- QTRACE("connected");
-
- UNUSED(task);
-
- /*
- * XXXRTH
- *
- * Currently we don't wait for the connect event before retrying
- * a query. This means that if we get really behind, we may end
- * up doing extra work!
- */
-
- query->connects--;
- fctx = query->fctx;
-
- if (RESQUERY_CANCELED(query)) {
- /*
- * This query was canceled while the connect() was in
- * progress.
- */
- isc_socket_detach(&query->tcpsocket);
- resquery_destroy(&query);
- } else {
- switch (sevent->result) {
- case ISC_R_SUCCESS:
- /*
- * We are connected. Create a dispatcher and
- * send the query.
- */
- attrs = 0;
- attrs |= DNS_DISPATCHATTR_TCP;
- attrs |= DNS_DISPATCHATTR_PRIVATE;
- attrs |= DNS_DISPATCHATTR_CONNECTED;
- if (isc_sockaddr_pf(&query->addrinfo->sockaddr) ==
- AF_INET)
- attrs |= DNS_DISPATCHATTR_IPV4;
- else
- attrs |= DNS_DISPATCHATTR_IPV6;
- attrs |= DNS_DISPATCHATTR_MAKEQUERY;
-
- result = dns_dispatch_createtcp(query->dispatchmgr,
- query->tcpsocket,
- query->fctx->res->taskmgr,
- 4096, 2, 1, 1, 3, attrs,
- &query->dispatch);
-
- /*
- * Regardless of whether dns_dispatch_create()
- * succeeded or not, we don't need our reference
- * to the socket anymore.
- */
- isc_socket_detach(&query->tcpsocket);
-
- if (result == ISC_R_SUCCESS)
- result = resquery_send(query);
-
- if (result != ISC_R_SUCCESS) {
- fctx_cancelquery(&query, NULL, NULL,
- ISC_FALSE);
- fctx_done(fctx, result);
- }
- break;
-
- case ISC_R_NETUNREACH:
- case ISC_R_HOSTUNREACH:
- case ISC_R_CONNREFUSED:
- case ISC_R_NOPERM:
- case ISC_R_ADDRNOTAVAIL:
- case ISC_R_CONNECTIONRESET:
- /*
- * No route to remote.
- */
- isc_socket_detach(&query->tcpsocket);
- fctx_cancelquery(&query, NULL, NULL, ISC_TRUE);
- retry = ISC_TRUE;
- break;
-
- default:
- isc_socket_detach(&query->tcpsocket);
- fctx_cancelquery(&query, NULL, NULL, ISC_FALSE);
- break;
- }
- }
-
- isc_event_free(&event);
-
- if (retry) {
- /*
- * Behave as if the idle timer has expired. For TCP
- * connections this may not actually reflect the latest timer.
- */
- fctx->attributes &= ~FCTX_ATTR_ADDRWAIT;
- result = fctx_stopidletimer(fctx);
- if (result != ISC_R_SUCCESS)
- fctx_done(fctx, result);
- else
- fctx_try(fctx);
- }
-}
-
-static void
-fctx_finddone(isc_task_t *task, isc_event_t *event) {
- fetchctx_t *fctx;
- dns_adbfind_t *find;
- dns_resolver_t *res;
- isc_boolean_t want_try = ISC_FALSE;
- isc_boolean_t want_done = ISC_FALSE;
- isc_boolean_t bucket_empty = ISC_FALSE;
- unsigned int bucketnum;
-
- find = event->ev_sender;
- fctx = event->ev_arg;
- REQUIRE(VALID_FCTX(fctx));
- res = fctx->res;
-
- UNUSED(task);
-
- FCTXTRACE("finddone");
-
- INSIST(fctx->pending > 0);
- fctx->pending--;
-
- if (ADDRWAIT(fctx)) {
- /*
- * The fetch is waiting for a name to be found.
- */
- INSIST(!SHUTTINGDOWN(fctx));
- fctx->attributes &= ~FCTX_ATTR_ADDRWAIT;
- if (event->ev_type == DNS_EVENT_ADBMOREADDRESSES)
- want_try = ISC_TRUE;
- else if (fctx->pending == 0) {
- /*
- * We've got nothing else to wait for and don't
- * know the answer. There's nothing to do but
- * fail the fctx.
- */
- want_done = ISC_TRUE;
- }
- } else if (SHUTTINGDOWN(fctx) && fctx->pending == 0 &&
- fctx->nqueries == 0 && ISC_LIST_EMPTY(fctx->validators)) {
- bucketnum = fctx->bucketnum;
- LOCK(&res->buckets[bucketnum].lock);
- /*
- * Note that we had to wait until we had the lock before
- * looking at fctx->references.
- */
- if (fctx->references == 0)
- bucket_empty = fctx_destroy(fctx);
- UNLOCK(&res->buckets[bucketnum].lock);
- }
-
- isc_event_free(&event);
- dns_adb_destroyfind(&find);
-
- if (want_try)
- fctx_try(fctx);
- else if (want_done)
- fctx_done(fctx, ISC_R_FAILURE);
- else if (bucket_empty)
- empty_bucket(res);
-}
-
-
-static inline isc_boolean_t
-bad_server(fetchctx_t *fctx, isc_sockaddr_t *address) {
- isc_sockaddr_t *sa;
-
- for (sa = ISC_LIST_HEAD(fctx->bad);
- sa != NULL;
- sa = ISC_LIST_NEXT(sa, link)) {
- if (isc_sockaddr_equal(sa, address))
- return (ISC_TRUE);
- }
-
- return (ISC_FALSE);
-}
-
-static inline isc_boolean_t
-mark_bad(fetchctx_t *fctx) {
- dns_adbfind_t *curr;
- dns_adbaddrinfo_t *addrinfo;
- isc_boolean_t all_bad = ISC_TRUE;
-
- /*
- * Mark all known bad servers, so we don't try to talk to them
- * again.
- */
-
- /*
- * Mark any bad nameservers.
- */
- for (curr = ISC_LIST_HEAD(fctx->finds);
- curr != NULL;
- curr = ISC_LIST_NEXT(curr, publink)) {
- for (addrinfo = ISC_LIST_HEAD(curr->list);
- addrinfo != NULL;
- addrinfo = ISC_LIST_NEXT(addrinfo, publink)) {
- if (bad_server(fctx, &addrinfo->sockaddr))
- addrinfo->flags |= FCTX_ADDRINFO_MARK;
- else
- all_bad = ISC_FALSE;
- }
- }
-
- /*
- * Mark any bad forwarders.
- */
- for (addrinfo = ISC_LIST_HEAD(fctx->forwaddrs);
- addrinfo != NULL;
- addrinfo = ISC_LIST_NEXT(addrinfo, publink)) {
- if (bad_server(fctx, &addrinfo->sockaddr))
- addrinfo->flags |= FCTX_ADDRINFO_MARK;
- else
- all_bad = ISC_FALSE;
- }
-
- /*
- * Mark any bad alternates.
- */
- for (curr = ISC_LIST_HEAD(fctx->altfinds);
- curr != NULL;
- curr = ISC_LIST_NEXT(curr, publink)) {
- for (addrinfo = ISC_LIST_HEAD(curr->list);
- addrinfo != NULL;
- addrinfo = ISC_LIST_NEXT(addrinfo, publink)) {
- if (bad_server(fctx, &addrinfo->sockaddr))
- addrinfo->flags |= FCTX_ADDRINFO_MARK;
- else
- all_bad = ISC_FALSE;
- }
- }
-
- for (addrinfo = ISC_LIST_HEAD(fctx->altaddrs);
- addrinfo != NULL;
- addrinfo = ISC_LIST_NEXT(addrinfo, publink)) {
- if (bad_server(fctx, &addrinfo->sockaddr))
- addrinfo->flags |= FCTX_ADDRINFO_MARK;
- else
- all_bad = ISC_FALSE;
- }
-
- return (all_bad);
-}
-
-static void
-add_bad(fetchctx_t *fctx, isc_sockaddr_t *address, isc_result_t reason) {
- char namebuf[DNS_NAME_FORMATSIZE];
- char addrbuf[ISC_SOCKADDR_FORMATSIZE];
- char classbuf[64];
- char typebuf[64];
- char code[64];
- isc_buffer_t b;
- isc_sockaddr_t *sa;
- const char *sep1, *sep2;
-
- if (bad_server(fctx, address)) {
- /*
- * We already know this server is bad.
- */
- return;
- }
-
- FCTXTRACE("add_bad");
-
- sa = isc_mem_get(fctx->res->mctx, sizeof(*sa));
- if (sa == NULL)
- return;
- *sa = *address;
- ISC_LIST_INITANDAPPEND(fctx->bad, sa, link);
-
- if (reason == DNS_R_LAME) /* already logged */
- return;
-
- if (reason == DNS_R_UNEXPECTEDRCODE) {
- isc_buffer_init(&b, code, sizeof(code) - 1);
- dns_rcode_totext(fctx->rmessage->rcode, &b);
- code[isc_buffer_usedlength(&b)] = '\0';
- sep1 = "(";
- sep2 = ") ";
- } else if (reason == DNS_R_UNEXPECTEDOPCODE) {
- isc_buffer_init(&b, code, sizeof(code) - 1);
- dns_opcode_totext((dns_opcode_t)fctx->rmessage->opcode, &b);
- code[isc_buffer_usedlength(&b)] = '\0';
- sep1 = "(";
- sep2 = ") ";
- } else {
- code[0] = '\0';
- sep1 = "";
- sep2 = "";
- }
- dns_name_format(&fctx->name, namebuf, sizeof(namebuf));
- dns_rdatatype_format(fctx->type, typebuf, sizeof(typebuf));
- dns_rdataclass_format(fctx->res->rdclass, classbuf, sizeof(classbuf));
- isc_sockaddr_format(address, addrbuf, sizeof(addrbuf));
- isc_log_write(dns_lctx, DNS_LOGCATEGORY_LAME_SERVERS,
- DNS_LOGMODULE_RESOLVER, ISC_LOG_INFO,
- "%s %s%s%sresolving '%s/%s/%s': %s",
- dns_result_totext(reason), sep1, code, sep2,
- namebuf, typebuf, classbuf, addrbuf);
-}
-
-static void
-sort_adbfind(dns_adbfind_t *find) {
- dns_adbaddrinfo_t *best, *curr;
- dns_adbaddrinfolist_t sorted;
-
- /*
- * Lame N^2 bubble sort.
- */
-
- ISC_LIST_INIT(sorted);
- while (!ISC_LIST_EMPTY(find->list)) {
- best = ISC_LIST_HEAD(find->list);
- curr = ISC_LIST_NEXT(best, publink);
- while (curr != NULL) {
- if (curr->srtt < best->srtt)
- best = curr;
- curr = ISC_LIST_NEXT(curr, publink);
- }
- ISC_LIST_UNLINK(find->list, best, publink);
- ISC_LIST_APPEND(sorted, best, publink);
- }
- find->list = sorted;
-}
-
-static void
-sort_finds(fetchctx_t *fctx) {
- dns_adbfind_t *best, *curr;
- dns_adbfindlist_t sorted;
- dns_adbaddrinfo_t *addrinfo, *bestaddrinfo;
-
- /*
- * Lame N^2 bubble sort.
- */
-
- ISC_LIST_INIT(sorted);
- while (!ISC_LIST_EMPTY(fctx->finds)) {
- best = ISC_LIST_HEAD(fctx->finds);
- bestaddrinfo = ISC_LIST_HEAD(best->list);
- INSIST(bestaddrinfo != NULL);
- curr = ISC_LIST_NEXT(best, publink);
- while (curr != NULL) {
- addrinfo = ISC_LIST_HEAD(curr->list);
- INSIST(addrinfo != NULL);
- if (addrinfo->srtt < bestaddrinfo->srtt) {
- best = curr;
- bestaddrinfo = addrinfo;
- }
- curr = ISC_LIST_NEXT(curr, publink);
- }
- ISC_LIST_UNLINK(fctx->finds, best, publink);
- ISC_LIST_APPEND(sorted, best, publink);
- }
- fctx->finds = sorted;
-
- ISC_LIST_INIT(sorted);
- while (!ISC_LIST_EMPTY(fctx->altfinds)) {
- best = ISC_LIST_HEAD(fctx->altfinds);
- bestaddrinfo = ISC_LIST_HEAD(best->list);
- INSIST(bestaddrinfo != NULL);
- curr = ISC_LIST_NEXT(best, publink);
- while (curr != NULL) {
- addrinfo = ISC_LIST_HEAD(curr->list);
- INSIST(addrinfo != NULL);
- if (addrinfo->srtt < bestaddrinfo->srtt) {
- best = curr;
- bestaddrinfo = addrinfo;
- }
- curr = ISC_LIST_NEXT(curr, publink);
- }
- ISC_LIST_UNLINK(fctx->altfinds, best, publink);
- ISC_LIST_APPEND(sorted, best, publink);
- }
- fctx->altfinds = sorted;
-}
-
-static void
-findname(fetchctx_t *fctx, dns_name_t *name, in_port_t port,
- unsigned int options, unsigned int flags, isc_stdtime_t now,
- isc_boolean_t *pruned, isc_boolean_t *need_alternate)
-{
- dns_adbaddrinfo_t *ai;
- dns_adbfind_t *find;
- dns_resolver_t *res;
- isc_boolean_t unshared;
- isc_result_t result;
-
- res = fctx->res;
- unshared = ISC_TF((fctx->options | DNS_FETCHOPT_UNSHARED) != 0);
- /*
- * If this name is a subdomain of the query domain, tell
- * the ADB to start looking using zone/hint data. This keeps us
- * from getting stuck if the nameserver is beneath the zone cut
- * and we don't know its address (e.g. because the A record has
- * expired).
- */
- if (dns_name_issubdomain(name, &fctx->domain))
- options |= DNS_ADBFIND_STARTATZONE;
- options |= DNS_ADBFIND_GLUEOK;
- options |= DNS_ADBFIND_HINTOK;
-
- /*
- * See what we know about this address.
- */
- find = NULL;
- result = dns_adb_createfind(fctx->adb,
- res->buckets[fctx->bucketnum].task,
- fctx_finddone, fctx, name,
- &fctx->domain, options, now, NULL,
- res->view->dstport, &find);
- if (result != ISC_R_SUCCESS) {
- if (result == DNS_R_ALIAS) {
- /*
- * XXXRTH Follow the CNAME/DNAME chain?
- */
- dns_adb_destroyfind(&find);
- }
- } else if (!ISC_LIST_EMPTY(find->list)) {
- /*
- * We have at least some of the addresses for the
- * name.
- */
- INSIST((find->options & DNS_ADBFIND_WANTEVENT) == 0);
- sort_adbfind(find);
- if (flags != 0 || port != 0) {
- for (ai = ISC_LIST_HEAD(find->list);
- ai != NULL;
- ai = ISC_LIST_NEXT(ai, publink)) {
- ai->flags |= flags;
- if (port != 0)
- isc_sockaddr_setport(&ai->sockaddr,
- port);
- }
- }
- if ((flags & FCTX_ADDRINFO_FORWARDER) != 0)
- ISC_LIST_APPEND(fctx->altfinds, find, publink);
- else
- ISC_LIST_APPEND(fctx->finds, find, publink);
- } else {
- /*
- * We don't know any of the addresses for this
- * name.
- */
- if ((find->options & DNS_ADBFIND_WANTEVENT) != 0) {
- /*
- * We're looking for them and will get an
- * event about it later.
- */
- fctx->pending++;
- /*
- * Bootstrap.
- */
- if (need_alternate != NULL &&
- !*need_alternate && unshared &&
- ((res->dispatchv4 == NULL &&
- find->result_v6 != DNS_R_NXDOMAIN) ||
- (res->dispatchv6 == NULL &&
- find->result_v4 != DNS_R_NXDOMAIN)))
- *need_alternate = ISC_TRUE;
- } else {
- /*
- * If we know there are no addresses for
- * the family we are using then try to add
- * an alternative server.
- */
- if (need_alternate != NULL && !*need_alternate &&
- ((res->dispatchv4 == NULL &&
- find->result_v6 == DNS_R_NXRRSET) ||
- (res->dispatchv6 == NULL &&
- find->result_v4 == DNS_R_NXRRSET)))
- *need_alternate = ISC_TRUE;
- /*
- * And ADB isn't going to send us any events
- * either. This find loses.
- */
- if ((find->options & DNS_ADBFIND_LAMEPRUNED) != 0) {
- /*
- * The ADB pruned lame servers for
- * this name. Remember that in case
- * we get desperate later on.
- */
- *pruned = ISC_TRUE;
- }
- dns_adb_destroyfind(&find);
- }
- }
-}
-
-static isc_result_t
-fctx_getaddresses(fetchctx_t *fctx) {
- dns_rdata_t rdata = DNS_RDATA_INIT;
- isc_result_t result;
- dns_resolver_t *res;
- isc_stdtime_t now;
- unsigned int stdoptions;
- isc_sockaddr_t *sa;
- dns_adbaddrinfo_t *ai;
- isc_boolean_t pruned, all_bad;
- dns_rdata_ns_t ns;
- isc_boolean_t need_alternate = ISC_FALSE;
-
- FCTXTRACE("getaddresses");
-
- /*
- * Don't pound on remote servers. (Failsafe!)
- */
- fctx->restarts++;
- if (fctx->restarts > 10) {
- FCTXTRACE("too many restarts");
- return (DNS_R_SERVFAIL);
- }
-
- res = fctx->res;
- pruned = ISC_FALSE;
- stdoptions = 0; /* Keep compiler happy. */
-
- /*
- * Forwarders.
- */
-
- INSIST(ISC_LIST_EMPTY(fctx->forwaddrs));
- INSIST(ISC_LIST_EMPTY(fctx->altaddrs));
-
- /*
- * If this fctx has forwarders, use them; otherwise use any
- * selective forwarders specified in the view; otherwise use the
- * resolver's forwarders (if any).
- */
- sa = ISC_LIST_HEAD(fctx->forwarders);
- if (sa == NULL) {
- dns_forwarders_t *forwarders = NULL;
- dns_name_t *name = &fctx->name;
- dns_name_t suffix;
- unsigned int labels;
-
- /*
- * DS records are found in the parent server.
- * Strip label to get the correct forwarder (if any).
- */
- if (fctx->type == dns_rdatatype_ds &&
- dns_name_countlabels(name) > 1) {
- dns_name_init(&suffix, NULL);
- labels = dns_name_countlabels(name);
- dns_name_getlabelsequence(name, 1, labels - 1, &suffix);
- name = &suffix;
- }
- result = dns_fwdtable_find(fctx->res->view->fwdtable, name,
- &forwarders);
- if (result == ISC_R_SUCCESS) {
- sa = ISC_LIST_HEAD(forwarders->addrs);
- fctx->fwdpolicy = forwarders->fwdpolicy;
- }
- }
-
- while (sa != NULL) {
- ai = NULL;
- result = dns_adb_findaddrinfo(fctx->adb,
- sa, &ai, 0); /* XXXMLG */
- if (result == ISC_R_SUCCESS) {
- dns_adbaddrinfo_t *cur;
- ai->flags |= FCTX_ADDRINFO_FORWARDER;
- cur = ISC_LIST_HEAD(fctx->forwaddrs);
- while (cur != NULL && cur->srtt < ai->srtt)
- cur = ISC_LIST_NEXT(cur, publink);
- if (cur != NULL)
- ISC_LIST_INSERTBEFORE(fctx->forwaddrs, cur,
- ai, publink);
- else
- ISC_LIST_APPEND(fctx->forwaddrs, ai, publink);
- }
- sa = ISC_LIST_NEXT(sa, link);
- }
-
- /*
- * If the forwarding policy is "only", we don't need the addresses
- * of the nameservers.
- */
- if (fctx->fwdpolicy == dns_fwdpolicy_only)
- goto out;
-
- /*
- * Normal nameservers.
- */
-
- stdoptions = DNS_ADBFIND_WANTEVENT | DNS_ADBFIND_EMPTYEVENT;
- if (fctx->restarts == 1) {
- /*
- * To avoid sending out a flood of queries likely to
- * result in NXRRSET, we suppress fetches for address
- * families we don't have the first time through,
- * provided that we have addresses in some family we
- * can use.
- *
- * We don't want to set this option all the time, since
- * if fctx->restarts > 1, we've clearly been having trouble
- * with the addresses we had, so getting more could help.
- */
- stdoptions |= DNS_ADBFIND_AVOIDFETCHES;
- }
- if (res->dispatchv4 != NULL)
- stdoptions |= DNS_ADBFIND_INET;
- if (res->dispatchv6 != NULL)
- stdoptions |= DNS_ADBFIND_INET6;
- isc_stdtime_get(&now);
-
- restart:
- INSIST(ISC_LIST_EMPTY(fctx->finds));
- INSIST(ISC_LIST_EMPTY(fctx->altfinds));
-
- for (result = dns_rdataset_first(&fctx->nameservers);
- result == ISC_R_SUCCESS;
- result = dns_rdataset_next(&fctx->nameservers))
- {
- dns_rdataset_current(&fctx->nameservers, &rdata);
- /*
- * Extract the name from the NS record.
- */
- result = dns_rdata_tostruct(&rdata, &ns, NULL);
- if (result != ISC_R_SUCCESS)
- continue;
-
- findname(fctx, &ns.name, 0, stdoptions, 0, now,
- &pruned, &need_alternate);
- dns_rdata_reset(&rdata);
- dns_rdata_freestruct(&ns);
- }
- if (result != ISC_R_NOMORE)
- return (result);
-
- /*
- * Do we need to use 6 to 4?
- */
- if (need_alternate) {
- int family;
- alternate_t *a;
- family = (res->dispatchv6 != NULL) ? AF_INET6 : AF_INET;
- for (a = ISC_LIST_HEAD(fctx->res->alternates);
- a != NULL;
- a = ISC_LIST_NEXT(a, link)) {
- if (!a->isaddress) {
- findname(fctx, &a->_u._n.name, a->_u._n.port,
- stdoptions, FCTX_ADDRINFO_FORWARDER,
- now, &pruned, NULL);
- continue;
- }
- if (isc_sockaddr_pf(&a->_u.addr) != family)
- continue;
- ai = NULL;
- result = dns_adb_findaddrinfo(fctx->adb, &a->_u.addr,
- &ai, 0);
- if (result == ISC_R_SUCCESS) {
- dns_adbaddrinfo_t *cur;
- ai->flags |= FCTX_ADDRINFO_FORWARDER;
- cur = ISC_LIST_HEAD(fctx->altaddrs);
- while (cur != NULL && cur->srtt < ai->srtt)
- cur = ISC_LIST_NEXT(cur, publink);
- if (cur != NULL)
- ISC_LIST_INSERTBEFORE(fctx->altaddrs,
- cur, ai, publink);
- else
- ISC_LIST_APPEND(fctx->altaddrs, ai,
- publink);
- }
- }
- }
-
- out:
- /*
- * Mark all known bad servers.
- */
- all_bad = mark_bad(fctx);
-
- /*
- * How are we doing?
- */
- if (all_bad) {
- /*
- * We've got no addresses.
- */
- if (fctx->pending > 0) {
- /*
- * We're fetching the addresses, but don't have any
- * yet. Tell the caller to wait for an answer.
- */
- result = DNS_R_WAIT;
- } else if (pruned) {
- /*
- * Some addresses were removed by lame pruning.
- * Turn pruning off and try again.
- */
- FCTXTRACE("restarting with returnlame");
- INSIST((stdoptions & DNS_ADBFIND_RETURNLAME) == 0);
- stdoptions |= DNS_ADBFIND_RETURNLAME;
- pruned = ISC_FALSE;
- fctx_cleanupaltfinds(fctx);
- fctx_cleanupfinds(fctx);
- goto restart;
- } else {
- /*
- * We've lost completely. We don't know any
- * addresses, and the ADB has told us it can't get
- * them.
- */
- FCTXTRACE("no addresses");
- result = ISC_R_FAILURE;
- }
- } else {
- /*
- * We've found some addresses. We might still be looking
- * for more addresses.
- */
- sort_finds(fctx);
- result = ISC_R_SUCCESS;
- }
-
- return (result);
-}
-
-static inline void
-possibly_mark(fetchctx_t *fctx, dns_adbaddrinfo_t *addr)
-{
- isc_netaddr_t na;
- char buf[ISC_NETADDR_FORMATSIZE];
- isc_sockaddr_t *sa;
- isc_boolean_t aborted = ISC_FALSE;
- isc_boolean_t bogus;
- dns_acl_t *blackhole;
- isc_netaddr_t ipaddr;
- dns_peer_t *peer = NULL;
- dns_resolver_t *res;
- const char *msg = NULL;
-
- sa = &addr->sockaddr;
-
- res = fctx->res;
- isc_netaddr_fromsockaddr(&ipaddr, sa);
- blackhole = dns_dispatchmgr_getblackhole(res->dispatchmgr);
- (void) dns_peerlist_peerbyaddr(res->view->peers, &ipaddr, &peer);
-
- if (blackhole != NULL) {
- int match;
-
- if (dns_acl_match(&ipaddr, NULL, blackhole,
- &res->view->aclenv,
- &match, NULL) == ISC_R_SUCCESS &&
- match > 0)
- aborted = ISC_TRUE;
- }
-
- if (peer != NULL &&
- dns_peer_getbogus(peer, &bogus) == ISC_R_SUCCESS &&
- bogus)
- aborted = ISC_TRUE;
-
- if (aborted) {
- addr->flags |= FCTX_ADDRINFO_MARK;
- msg = "ignoring blackholed / bogus server: ";
- } else if (isc_sockaddr_ismulticast(sa)) {
- addr->flags |= FCTX_ADDRINFO_MARK;
- msg = "ignoring multicast address: ";
- } else if (isc_sockaddr_isexperimental(sa)) {
- addr->flags |= FCTX_ADDRINFO_MARK;
- msg = "ignoring experimental address: ";
- } else if (sa->type.sa.sa_family != AF_INET6) {
- return;
- } else if (IN6_IS_ADDR_V4MAPPED(&sa->type.sin6.sin6_addr)) {
- addr->flags |= FCTX_ADDRINFO_MARK;
- msg = "ignoring IPv6 mapped IPV4 address: ";
- } else if (IN6_IS_ADDR_V4COMPAT(&sa->type.sin6.sin6_addr)) {
- addr->flags |= FCTX_ADDRINFO_MARK;
- msg = "ignoring IPv6 compatibility IPV4 address: ";
- } else
- return;
-
- if (!isc_log_wouldlog(dns_lctx, ISC_LOG_DEBUG(3)))
- return;
-
- isc_netaddr_fromsockaddr(&na, sa);
- isc_netaddr_format(&na, buf, sizeof(buf));
- FCTXTRACE2(msg, buf);
-}
-
-static inline dns_adbaddrinfo_t *
-fctx_nextaddress(fetchctx_t *fctx) {
- dns_adbfind_t *find, *start;
- dns_adbaddrinfo_t *addrinfo;
- dns_adbaddrinfo_t *faddrinfo;
-
- /*
- * Return the next untried address, if any.
- */
-
- /*
- * Find the first unmarked forwarder (if any).
- */
- for (addrinfo = ISC_LIST_HEAD(fctx->forwaddrs);
- addrinfo != NULL;
- addrinfo = ISC_LIST_NEXT(addrinfo, publink)) {
- if (!UNMARKED(addrinfo))
- continue;
- possibly_mark(fctx, addrinfo);
- if (UNMARKED(addrinfo)) {
- addrinfo->flags |= FCTX_ADDRINFO_MARK;
- fctx->find = NULL;
- return (addrinfo);
- }
- }
-
- /*
- * No forwarders. Move to the next find.
- */
-
- fctx->attributes |= FCTX_ATTR_TRIEDFIND;
-
- find = fctx->find;
- if (find == NULL)
- find = ISC_LIST_HEAD(fctx->finds);
- else {
- find = ISC_LIST_NEXT(find, publink);
- if (find == NULL)
- find = ISC_LIST_HEAD(fctx->finds);
- }
-
- /*
- * Find the first unmarked addrinfo.
- */
- addrinfo = NULL;
- if (find != NULL) {
- start = find;
- do {
- for (addrinfo = ISC_LIST_HEAD(find->list);
- addrinfo != NULL;
- addrinfo = ISC_LIST_NEXT(addrinfo, publink)) {
- if (!UNMARKED(addrinfo))
- continue;
- possibly_mark(fctx, addrinfo);
- if (UNMARKED(addrinfo)) {
- addrinfo->flags |= FCTX_ADDRINFO_MARK;
- break;
- }
- }
- if (addrinfo != NULL)
- break;
- find = ISC_LIST_NEXT(find, publink);
- if (find == NULL)
- find = ISC_LIST_HEAD(fctx->finds);
- } while (find != start);
- }
-
- fctx->find = find;
- if (addrinfo != NULL)
- return (addrinfo);
-
- /*
- * No nameservers left. Try alternates.
- */
-
- fctx->attributes |= FCTX_ATTR_TRIEDALT;
-
- find = fctx->altfind;
- if (find == NULL)
- find = ISC_LIST_HEAD(fctx->altfinds);
- else {
- find = ISC_LIST_NEXT(find, publink);
- if (find == NULL)
- find = ISC_LIST_HEAD(fctx->altfinds);
- }
-
- /*
- * Find the first unmarked addrinfo.
- */
- addrinfo = NULL;
- if (find != NULL) {
- start = find;
- do {
- for (addrinfo = ISC_LIST_HEAD(find->list);
- addrinfo != NULL;
- addrinfo = ISC_LIST_NEXT(addrinfo, publink)) {
- if (!UNMARKED(addrinfo))
- continue;
- possibly_mark(fctx, addrinfo);
- if (UNMARKED(addrinfo)) {
- addrinfo->flags |= FCTX_ADDRINFO_MARK;
- break;
- }
- }
- if (addrinfo != NULL)
- break;
- find = ISC_LIST_NEXT(find, publink);
- if (find == NULL)
- find = ISC_LIST_HEAD(fctx->altfinds);
- } while (find != start);
- }
-
- faddrinfo = addrinfo;
-
- /*
- * See if we have a better alternate server by address.
- */
-
- for (addrinfo = ISC_LIST_HEAD(fctx->altaddrs);
- addrinfo != NULL;
- addrinfo = ISC_LIST_NEXT(addrinfo, publink)) {
- if (!UNMARKED(addrinfo))
- continue;
- possibly_mark(fctx, addrinfo);
- if (UNMARKED(addrinfo) &&
- (faddrinfo == NULL ||
- addrinfo->srtt < faddrinfo->srtt)) {
- if (faddrinfo != NULL)
- faddrinfo->flags &= ~FCTX_ADDRINFO_MARK;
- addrinfo->flags |= FCTX_ADDRINFO_MARK;
- break;
- }
- }
-
- if (addrinfo == NULL) {
- addrinfo = faddrinfo;
- fctx->altfind = find;
- }
-
- return (addrinfo);
-}
-
-static void
-fctx_try(fetchctx_t *fctx) {
- isc_result_t result;
- dns_adbaddrinfo_t *addrinfo;
-
- FCTXTRACE("try");
-
- REQUIRE(!ADDRWAIT(fctx));
-
- addrinfo = fctx_nextaddress(fctx);
- if (addrinfo == NULL) {
- /*
- * We have no more addresses. Start over.
- */
- fctx_cancelqueries(fctx, ISC_TRUE);
- fctx_cleanupfinds(fctx);
- fctx_cleanupaltfinds(fctx);
- fctx_cleanupforwaddrs(fctx);
- fctx_cleanupaltaddrs(fctx);
- result = fctx_getaddresses(fctx);
- if (result == DNS_R_WAIT) {
- /*
- * Sleep waiting for addresses.
- */
- FCTXTRACE("addrwait");
- fctx->attributes |= FCTX_ATTR_ADDRWAIT;
- return;
- } else if (result != ISC_R_SUCCESS) {
- /*
- * Something bad happened.
- */
- fctx_done(fctx, result);
- return;
- }
-
- addrinfo = fctx_nextaddress(fctx);
- /*
- * While we may have addresses from the ADB, they
- * might be bad ones. In this case, return SERVFAIL.
- */
- if (addrinfo == NULL) {
- fctx_done(fctx, DNS_R_SERVFAIL);
- return;
- }
- }
-
- result = fctx_query(fctx, addrinfo, fctx->options);
- if (result != ISC_R_SUCCESS)
- fctx_done(fctx, result);
-}
-
-static isc_boolean_t
-fctx_destroy(fetchctx_t *fctx) {
- dns_resolver_t *res;
- unsigned int bucketnum;
- isc_sockaddr_t *sa, *next_sa;
-
- /*
- * Caller must be holding the bucket lock.
- */
-
- REQUIRE(VALID_FCTX(fctx));
- REQUIRE(fctx->state == fetchstate_done ||
- fctx->state == fetchstate_init);
- REQUIRE(ISC_LIST_EMPTY(fctx->events));
- REQUIRE(ISC_LIST_EMPTY(fctx->queries));
- REQUIRE(ISC_LIST_EMPTY(fctx->finds));
- REQUIRE(ISC_LIST_EMPTY(fctx->altfinds));
- REQUIRE(fctx->pending == 0);
- REQUIRE(fctx->references == 0);
- REQUIRE(ISC_LIST_EMPTY(fctx->validators));
-
- FCTXTRACE("destroy");
-
- res = fctx->res;
- bucketnum = fctx->bucketnum;
-
- ISC_LIST_UNLINK(res->buckets[bucketnum].fctxs, fctx, link);
-
- /*
- * Free bad.
- */
- for (sa = ISC_LIST_HEAD(fctx->bad);
- sa != NULL;
- sa = next_sa) {
- next_sa = ISC_LIST_NEXT(sa, link);
- ISC_LIST_UNLINK(fctx->bad, sa, link);
- isc_mem_put(res->mctx, sa, sizeof(*sa));
- }
-
- isc_timer_detach(&fctx->timer);
- dns_message_destroy(&fctx->rmessage);
- dns_message_destroy(&fctx->qmessage);
- if (dns_name_countlabels(&fctx->domain) > 0)
- dns_name_free(&fctx->domain, res->mctx);
- if (dns_rdataset_isassociated(&fctx->nameservers))
- dns_rdataset_disassociate(&fctx->nameservers);
- dns_name_free(&fctx->name, res->mctx);
- dns_db_detach(&fctx->cache);
- dns_adb_detach(&fctx->adb);
- isc_mem_free(res->mctx, fctx->info);
- isc_mem_put(res->mctx, fctx, sizeof(*fctx));
-
- LOCK(&res->nlock);
- res->nfctx--;
- UNLOCK(&res->nlock);
-
- if (res->buckets[bucketnum].exiting &&
- ISC_LIST_EMPTY(res->buckets[bucketnum].fctxs))
- return (ISC_TRUE);
-
- return (ISC_FALSE);
-}
-
-/*
- * Fetch event handlers.
- */
-
-static void
-fctx_timeout(isc_task_t *task, isc_event_t *event) {
- fetchctx_t *fctx = event->ev_arg;
-
- REQUIRE(VALID_FCTX(fctx));
-
- UNUSED(task);
-
- FCTXTRACE("timeout");
-
- if (event->ev_type == ISC_TIMEREVENT_LIFE) {
- fctx_done(fctx, ISC_R_TIMEDOUT);
- } else {
- isc_result_t result;
-
- fctx->timeouts++;
- /*
- * We could cancel the running queries here, or we could let
- * them keep going. Right now we choose the latter...
- */
- fctx->attributes &= ~FCTX_ATTR_ADDRWAIT;
- /*
- * Our timer has triggered. Reestablish the fctx lifetime
- * timer.
- */
- result = fctx_starttimer(fctx);
- if (result != ISC_R_SUCCESS)
- fctx_done(fctx, result);
- else
- /*
- * Keep trying.
- */
- fctx_try(fctx);
- }
-
- isc_event_free(&event);
-}
-
-static void
-fctx_shutdown(fetchctx_t *fctx) {
- isc_event_t *cevent;
-
- /*
- * Start the shutdown process for fctx, if it isn't already underway.
- */
-
- FCTXTRACE("shutdown");
-
- /*
- * The caller must be holding the appropriate bucket lock.
- */
-
- if (fctx->want_shutdown)
- return;
-
- fctx->want_shutdown = ISC_TRUE;
-
- /*
- * Unless we're still initializing (in which case the
- * control event is still outstanding), we need to post
- * the control event to tell the fetch we want it to
- * exit.
- */
- if (fctx->state != fetchstate_init) {
- cevent = &fctx->control_event;
- isc_task_send(fctx->res->buckets[fctx->bucketnum].task,
- &cevent);
- }
-}
-
-static void
-fctx_doshutdown(isc_task_t *task, isc_event_t *event) {
- fetchctx_t *fctx = event->ev_arg;
- isc_boolean_t bucket_empty = ISC_FALSE;
- dns_resolver_t *res;
- unsigned int bucketnum;
- dns_validator_t *validator;
-
- REQUIRE(VALID_FCTX(fctx));
-
- UNUSED(task);
-
- res = fctx->res;
- bucketnum = fctx->bucketnum;
-
- FCTXTRACE("doshutdown");
-
- /*
- * An fctx that is shutting down is no longer in ADDRWAIT mode.
- */
- fctx->attributes &= ~FCTX_ATTR_ADDRWAIT;
-
- /*
- * Cancel all pending validators. Note that this must be done
- * without the bucket lock held, since that could cause deadlock.
- */
- validator = ISC_LIST_HEAD(fctx->validators);
- while (validator != NULL) {
- dns_validator_cancel(validator);
- validator = ISC_LIST_NEXT(validator, link);
- }
-
- if (fctx->nsfetch != NULL)
- dns_resolver_cancelfetch(fctx->nsfetch);
-
- /*
- * Shut down anything that is still running on behalf of this
- * fetch. To avoid deadlock with the ADB, we must do this
- * before we lock the bucket lock.
- */
- fctx_stopeverything(fctx, ISC_FALSE);
-
- LOCK(&res->buckets[bucketnum].lock);
-
- fctx->attributes |= FCTX_ATTR_SHUTTINGDOWN;
-
- INSIST(fctx->state == fetchstate_active ||
- fctx->state == fetchstate_done);
- INSIST(fctx->want_shutdown);
-
- if (fctx->state != fetchstate_done) {
- fctx->state = fetchstate_done;
- fctx_sendevents(fctx, ISC_R_CANCELED);
- }
-
- if (fctx->references == 0 && fctx->pending == 0 &&
- fctx->nqueries == 0 && ISC_LIST_EMPTY(fctx->validators))
- bucket_empty = fctx_destroy(fctx);
-
- UNLOCK(&res->buckets[bucketnum].lock);
-
- if (bucket_empty)
- empty_bucket(res);
-}
-
-static void
-fctx_start(isc_task_t *task, isc_event_t *event) {
- fetchctx_t *fctx = event->ev_arg;
- isc_boolean_t done = ISC_FALSE, bucket_empty = ISC_FALSE;
- dns_resolver_t *res;
- unsigned int bucketnum;
-
- REQUIRE(VALID_FCTX(fctx));
-
- UNUSED(task);
-
- res = fctx->res;
- bucketnum = fctx->bucketnum;
-
- FCTXTRACE("start");
-
- LOCK(&res->buckets[bucketnum].lock);
-
- INSIST(fctx->state == fetchstate_init);
- if (fctx->want_shutdown) {
- /*
- * We haven't started this fctx yet, and we've been requested
- * to shut it down.
- */
- fctx->attributes |= FCTX_ATTR_SHUTTINGDOWN;
- fctx->state = fetchstate_done;
- fctx_sendevents(fctx, ISC_R_CANCELED);
- /*
- * Since we haven't started, we INSIST that we have no
- * pending ADB finds and no pending validations.
- */
- INSIST(fctx->pending == 0);
- INSIST(fctx->nqueries == 0);
- INSIST(ISC_LIST_EMPTY(fctx->validators));
- if (fctx->references == 0) {
- /*
- * It's now safe to destroy this fctx.
- */
- bucket_empty = fctx_destroy(fctx);
- }
- done = ISC_TRUE;
- } else {
- /*
- * Normal fctx startup.
- */
- fctx->state = fetchstate_active;
- /*
- * Reset the control event for later use in shutting down
- * the fctx.
- */
- ISC_EVENT_INIT(event, sizeof(*event), 0, NULL,
- DNS_EVENT_FETCHCONTROL, fctx_doshutdown, fctx,
- NULL, NULL, NULL);
- }
-
- UNLOCK(&res->buckets[bucketnum].lock);
-
- if (!done) {
- isc_result_t result;
-
- /*
- * All is well. Start working on the fetch.
- */
- result = fctx_starttimer(fctx);
- if (result != ISC_R_SUCCESS)
- fctx_done(fctx, result);
- else
- fctx_try(fctx);
- } else if (bucket_empty)
- empty_bucket(res);
-}
-
-/*
- * Fetch Creation, Joining, and Cancelation.
- */
-
-static inline isc_result_t
-fctx_join(fetchctx_t *fctx, isc_task_t *task, isc_taskaction_t action,
- void *arg, dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset,
- dns_fetch_t *fetch)
-{
- isc_task_t *clone;
- dns_fetchevent_t *event;
-
- FCTXTRACE("join");
-
- /*
- * We store the task we're going to send this event to in the
- * sender field. We'll make the fetch the sender when we actually
- * send the event.
- */
- clone = NULL;
- isc_task_attach(task, &clone);
- event = (dns_fetchevent_t *)
- isc_event_allocate(fctx->res->mctx, clone,
- DNS_EVENT_FETCHDONE,
- action, arg, sizeof(*event));
- if (event == NULL) {
- isc_task_detach(&clone);
- return (ISC_R_NOMEMORY);
- }
- event->result = DNS_R_SERVFAIL;
- event->qtype = fctx->type;
- event->db = NULL;
- event->node = NULL;
- event->rdataset = rdataset;
- event->sigrdataset = sigrdataset;
- event->fetch = fetch;
- dns_fixedname_init(&event->foundname);
-
- /*
- * Make sure that we can store the sigrdataset in the
- * first event if it is needed by any of the events.
- */
- if (event->sigrdataset != NULL)
- ISC_LIST_PREPEND(fctx->events, event, ev_link);
- else
- ISC_LIST_APPEND(fctx->events, event, ev_link);
- fctx->references++;
-
- fetch->magic = DNS_FETCH_MAGIC;
- fetch->private = fctx;
-
- return (ISC_R_SUCCESS);
-}
-
-static isc_result_t
-fctx_create(dns_resolver_t *res, dns_name_t *name, dns_rdatatype_t type,
- dns_name_t *domain, dns_rdataset_t *nameservers,
- unsigned int options, unsigned int bucketnum, fetchctx_t **fctxp)
-{
- fetchctx_t *fctx;
- isc_result_t result;
- isc_result_t iresult;
- isc_interval_t interval;
- dns_fixedname_t fixed;
- unsigned int findoptions = 0;
- char buf[DNS_NAME_FORMATSIZE + DNS_RDATATYPE_FORMATSIZE];
- char typebuf[DNS_RDATATYPE_FORMATSIZE];
- dns_name_t suffix;
-
- /*
- * Caller must be holding the lock for bucket number 'bucketnum'.
- */
- REQUIRE(fctxp != NULL && *fctxp == NULL);
-
- fctx = isc_mem_get(res->mctx, sizeof(*fctx));
- if (fctx == NULL)
- return (ISC_R_NOMEMORY);
- dns_name_format(name, buf, sizeof(buf));
- dns_rdatatype_format(type, typebuf, sizeof(typebuf));
- strcat(buf, "/"); /* checked */
- strcat(buf, typebuf); /* checked */
- fctx->info = isc_mem_strdup(res->mctx, buf);
- if (fctx->info == NULL) {
- result = ISC_R_NOMEMORY;
- goto cleanup_fetch;
- }
- FCTXTRACE("create");
- dns_name_init(&fctx->name, NULL);
- result = dns_name_dup(name, res->mctx, &fctx->name);
- if (result != ISC_R_SUCCESS)
- goto cleanup_info;
- dns_name_init(&fctx->domain, NULL);
- dns_rdataset_init(&fctx->nameservers);
-
- fctx->type = type;
- fctx->options = options;
- /*
- * Note! We do not attach to the task. We are relying on the
- * resolver to ensure that this task doesn't go away while we are
- * using it.
- */
- fctx->res = res;
- fctx->references = 0;
- fctx->bucketnum = bucketnum;
- fctx->state = fetchstate_init;
- fctx->want_shutdown = ISC_FALSE;
- fctx->cloned = ISC_FALSE;
- ISC_LIST_INIT(fctx->queries);
- ISC_LIST_INIT(fctx->finds);
- ISC_LIST_INIT(fctx->altfinds);
- ISC_LIST_INIT(fctx->forwaddrs);
- ISC_LIST_INIT(fctx->altaddrs);
- ISC_LIST_INIT(fctx->forwarders);
- fctx->fwdpolicy = dns_fwdpolicy_none;
- ISC_LIST_INIT(fctx->bad);
- ISC_LIST_INIT(fctx->validators);
- fctx->find = NULL;
- fctx->altfind = NULL;
- fctx->pending = 0;
- fctx->restarts = 0;
- fctx->timeouts = 0;
- fctx->attributes = 0;
- fctx->nqueries = 0;
-
- dns_name_init(&fctx->nsname, NULL);
- fctx->nsfetch = NULL;
- dns_rdataset_init(&fctx->nsrrset);
-
- if (domain == NULL) {
- dns_forwarders_t *forwarders = NULL;
- unsigned int labels;
-
- /*
- * DS records are found in the parent server.
- * Strip label to get the correct forwarder (if any).
- */
- if (fctx->type == dns_rdatatype_ds &&
- dns_name_countlabels(name) > 1) {
- dns_name_init(&suffix, NULL);
- labels = dns_name_countlabels(name);
- dns_name_getlabelsequence(name, 1, labels - 1, &suffix);
- name = &suffix;
- }
- dns_fixedname_init(&fixed);
- domain = dns_fixedname_name(&fixed);
- result = dns_fwdtable_find2(fctx->res->view->fwdtable, name,
- domain, &forwarders);
- if (result == ISC_R_SUCCESS)
- fctx->fwdpolicy = forwarders->fwdpolicy;
-
- if (fctx->fwdpolicy != dns_fwdpolicy_only) {
- /*
- * The caller didn't supply a query domain and
- * nameservers, and we're not in forward-only mode,
- * so find the best nameservers to use.
- */
- if (dns_rdatatype_atparent(type))
- findoptions |= DNS_DBFIND_NOEXACT;
- result = dns_view_findzonecut(res->view, name, domain,
- 0, findoptions, ISC_TRUE,
- &fctx->nameservers,
- NULL);
- if (result != ISC_R_SUCCESS)
- goto cleanup_name;
- result = dns_name_dup(domain, res->mctx, &fctx->domain);
- if (result != ISC_R_SUCCESS) {
- dns_rdataset_disassociate(&fctx->nameservers);
- goto cleanup_name;
- }
- } else {
- /*
- * We're in forward-only mode. Set the query domain.
- */
- result = dns_name_dup(domain, res->mctx, &fctx->domain);
- if (result != ISC_R_SUCCESS)
- goto cleanup_name;
- }
- } else {
- result = dns_name_dup(domain, res->mctx, &fctx->domain);
- if (result != ISC_R_SUCCESS)
- goto cleanup_name;
- dns_rdataset_clone(nameservers, &fctx->nameservers);
- }
-
- INSIST(dns_name_issubdomain(&fctx->name, &fctx->domain));
-
- fctx->qmessage = NULL;
- result = dns_message_create(res->mctx, DNS_MESSAGE_INTENTRENDER,
- &fctx->qmessage);
-
- if (result != ISC_R_SUCCESS)
- goto cleanup_domain;
-
- fctx->rmessage = NULL;
- result = dns_message_create(res->mctx, DNS_MESSAGE_INTENTPARSE,
- &fctx->rmessage);
-
- if (result != ISC_R_SUCCESS)
- goto cleanup_qmessage;
-
- /*
- * Compute an expiration time for the entire fetch.
- */
- isc_interval_set(&interval, 30, 0); /* XXXRTH constant */
- iresult = isc_time_nowplusinterval(&fctx->expires, &interval);
- if (iresult != ISC_R_SUCCESS) {
- UNEXPECTED_ERROR(__FILE__, __LINE__,
- "isc_time_nowplusinterval: %s",
- isc_result_totext(iresult));
- result = ISC_R_UNEXPECTED;
- goto cleanup_rmessage;
- }
-
- /*
- * Default retry interval initialization. We set the interval now
- * mostly so it won't be uninitialized. It will be set to the
- * correct value before a query is issued.
- */
- isc_interval_set(&fctx->interval, 2, 0);
-
- /*
- * Create an inactive timer. It will be made active when the fetch
- * is actually started.
- */
- fctx->timer = NULL;
- iresult = isc_timer_create(res->timermgr, isc_timertype_inactive,
- NULL, NULL,
- res->buckets[bucketnum].task, fctx_timeout,
- fctx, &fctx->timer);
- if (iresult != ISC_R_SUCCESS) {
- UNEXPECTED_ERROR(__FILE__, __LINE__,
- "isc_timer_create: %s",
- isc_result_totext(iresult));
- result = ISC_R_UNEXPECTED;
- goto cleanup_rmessage;
- }
-
- /*
- * Attach to the view's cache and adb.
- */
- fctx->cache = NULL;
- dns_db_attach(res->view->cachedb, &fctx->cache);
- fctx->adb = NULL;
- dns_adb_attach(res->view->adb, &fctx->adb);
-
- ISC_LIST_INIT(fctx->events);
- ISC_LINK_INIT(fctx, link);
- fctx->magic = FCTX_MAGIC;
-
- ISC_LIST_APPEND(res->buckets[bucketnum].fctxs, fctx, link);
-
- LOCK(&res->nlock);
- res->nfctx++;
- UNLOCK(&res->nlock);
-
- *fctxp = fctx;
-
- return (ISC_R_SUCCESS);
-
- cleanup_rmessage:
- dns_message_destroy(&fctx->rmessage);
-
- cleanup_qmessage:
- dns_message_destroy(&fctx->qmessage);
-
- cleanup_domain:
- if (dns_name_countlabels(&fctx->domain) > 0)
- dns_name_free(&fctx->domain, res->mctx);
- if (dns_rdataset_isassociated(&fctx->nameservers))
- dns_rdataset_disassociate(&fctx->nameservers);
-
- cleanup_name:
- dns_name_free(&fctx->name, res->mctx);
-
- cleanup_info:
- isc_mem_free(res->mctx, fctx->info);
-
- cleanup_fetch:
- isc_mem_put(res->mctx, fctx, sizeof(*fctx));
-
- return (result);
-}
-
-/*
- * Handle Responses
- */
-static inline isc_boolean_t
-is_lame(fetchctx_t *fctx) {
- dns_message_t *message = fctx->rmessage;
- dns_name_t *name;
- dns_rdataset_t *rdataset;
- isc_result_t result;
-
- if (message->rcode != dns_rcode_noerror &&
- message->rcode != dns_rcode_nxdomain)
- return (ISC_FALSE);
-
- if (message->counts[DNS_SECTION_ANSWER] != 0)
- return (ISC_FALSE);
-
- if (message->counts[DNS_SECTION_AUTHORITY] == 0)
- return (ISC_FALSE);
-
- result = dns_message_firstname(message, DNS_SECTION_AUTHORITY);
- while (result == ISC_R_SUCCESS) {
- name = NULL;
- dns_message_currentname(message, DNS_SECTION_AUTHORITY, &name);
- for (rdataset = ISC_LIST_HEAD(name->list);
- rdataset != NULL;
- rdataset = ISC_LIST_NEXT(rdataset, link)) {
- dns_namereln_t namereln;
- int order;
- unsigned int labels;
- if (rdataset->type != dns_rdatatype_ns)
- continue;
- namereln = dns_name_fullcompare(name, &fctx->domain,
- &order, &labels);
- if (namereln == dns_namereln_equal &&
- (message->flags & DNS_MESSAGEFLAG_AA) != 0)
- return (ISC_FALSE);
- if (namereln == dns_namereln_subdomain)
- return (ISC_FALSE);
- return (ISC_TRUE);
- }
- result = dns_message_nextname(message, DNS_SECTION_AUTHORITY);
- }
-
- return (ISC_FALSE);
-}
-
-static inline void
-log_lame(fetchctx_t *fctx, dns_adbaddrinfo_t *addrinfo) {
- char namebuf[DNS_NAME_FORMATSIZE];
- char domainbuf[DNS_NAME_FORMATSIZE];
- char addrbuf[ISC_SOCKADDR_FORMATSIZE];
-
- dns_name_format(&fctx->name, namebuf, sizeof(namebuf));
- dns_name_format(&fctx->domain, domainbuf, sizeof(domainbuf));
- isc_sockaddr_format(&addrinfo->sockaddr, addrbuf, sizeof(addrbuf));
- isc_log_write(dns_lctx, DNS_LOGCATEGORY_LAME_SERVERS,
- DNS_LOGMODULE_RESOLVER, ISC_LOG_INFO,
- "lame server resolving '%s' (in '%s'?): %s",
- namebuf, domainbuf, addrbuf);
-}
-
-static inline isc_result_t
-same_question(fetchctx_t *fctx) {
- isc_result_t result;
- dns_message_t *message = fctx->rmessage;
- dns_name_t *name;
- dns_rdataset_t *rdataset;
-
- /*
- * Caller must be holding the fctx lock.
- */
-
- /*
- * XXXRTH Currently we support only one question.
- */
- if (message->counts[DNS_SECTION_QUESTION] != 1)
- return (DNS_R_FORMERR);
-
- result = dns_message_firstname(message, DNS_SECTION_QUESTION);
- if (result != ISC_R_SUCCESS)
- return (result);
- name = NULL;
- dns_message_currentname(message, DNS_SECTION_QUESTION, &name);
- rdataset = ISC_LIST_HEAD(name->list);
- INSIST(rdataset != NULL);
- INSIST(ISC_LIST_NEXT(rdataset, link) == NULL);
- if (fctx->type != rdataset->type ||
- fctx->res->rdclass != rdataset->rdclass ||
- !dns_name_equal(&fctx->name, name))
- return (DNS_R_FORMERR);
-
- return (ISC_R_SUCCESS);
-}
-
-static void
-clone_results(fetchctx_t *fctx) {
- dns_fetchevent_t *event, *hevent;
- isc_result_t result;
- dns_name_t *name, *hname;
-
- FCTXTRACE("clone_results");
-
- /*
- * Set up any other events to have the same data as the first
- * event.
- *
- * Caller must be holding the appropriate lock.
- */
-
- fctx->cloned = ISC_TRUE;
- hevent = ISC_LIST_HEAD(fctx->events);
- if (hevent == NULL)
- return;
- hname = dns_fixedname_name(&hevent->foundname);
- for (event = ISC_LIST_NEXT(hevent, ev_link);
- event != NULL;
- event = ISC_LIST_NEXT(event, ev_link)) {
- name = dns_fixedname_name(&event->foundname);
- result = dns_name_copy(hname, name, NULL);
- if (result != ISC_R_SUCCESS)
- event->result = result;
- else
- event->result = hevent->result;
- dns_db_attach(hevent->db, &event->db);
- dns_db_attachnode(hevent->db, hevent->node, &event->node);
- INSIST(hevent->rdataset != NULL);
- INSIST(event->rdataset != NULL);
- if (dns_rdataset_isassociated(hevent->rdataset))
- dns_rdataset_clone(hevent->rdataset, event->rdataset);
- INSIST(! (hevent->sigrdataset == NULL &&
- event->sigrdataset != NULL));
- if (hevent->sigrdataset != NULL &&
- dns_rdataset_isassociated(hevent->sigrdataset) &&
- event->sigrdataset != NULL)
- dns_rdataset_clone(hevent->sigrdataset,
- event->sigrdataset);
- }
-}
-
-#define CACHE(r) (((r)->attributes & DNS_RDATASETATTR_CACHE) != 0)
-#define ANSWER(r) (((r)->attributes & DNS_RDATASETATTR_ANSWER) != 0)
-#define ANSWERSIG(r) (((r)->attributes & DNS_RDATASETATTR_ANSWERSIG) != 0)
-#define EXTERNAL(r) (((r)->attributes & DNS_RDATASETATTR_EXTERNAL) != 0)
-#define CHAINING(r) (((r)->attributes & DNS_RDATASETATTR_CHAINING) != 0)
-#define CHASE(r) (((r)->attributes & DNS_RDATASETATTR_CHASE) != 0)
-#define CHECKNAMES(r) (((r)->attributes & DNS_RDATASETATTR_CHECKNAMES) != 0)
-
-
-/*
- * Destroy '*fctx' if it is ready to be destroyed (i.e., if it has
- * no references and is no longer waiting for any events). If this
- * was the last fctx in the resolver, destroy the resolver.
- *
- * Requires:
- * '*fctx' is shutting down.
- */
-static void
-maybe_destroy(fetchctx_t *fctx) {
- unsigned int bucketnum;
- isc_boolean_t bucket_empty = ISC_FALSE;
- dns_resolver_t *res = fctx->res;
- dns_validator_t *validator;
-
- REQUIRE(SHUTTINGDOWN(fctx));
-
- if (fctx->pending != 0 || fctx->nqueries != 0)
- return;
-
- for (validator = ISC_LIST_HEAD(fctx->validators);
- validator != NULL;
- validator = ISC_LIST_HEAD(fctx->validators)) {
- ISC_LIST_UNLINK(fctx->validators, validator, link);
- dns_validator_cancel(validator);
- dns_validator_destroy(&validator);
- }
-
- bucketnum = fctx->bucketnum;
- LOCK(&res->buckets[bucketnum].lock);
- if (fctx->references == 0)
- bucket_empty = fctx_destroy(fctx);
- UNLOCK(&res->buckets[bucketnum].lock);
-
- if (bucket_empty)
- empty_bucket(res);
-}
-
-/*
- * The validator has finished.
- */
-static void
-validated(isc_task_t *task, isc_event_t *event) {
- isc_result_t result = ISC_R_SUCCESS;
- isc_result_t eresult = ISC_R_SUCCESS;
- isc_stdtime_t now;
- fetchctx_t *fctx;
- dns_validatorevent_t *vevent;
- dns_fetchevent_t *hevent;
- dns_rdataset_t *ardataset = NULL;
- dns_rdataset_t *asigrdataset = NULL;
- dns_dbnode_t *node = NULL;
- isc_boolean_t negative;
- isc_boolean_t chaining;
- isc_boolean_t sentresponse;
- isc_uint32_t ttl;
- dns_dbnode_t *nsnode = NULL;
- dns_name_t *name;
- dns_rdataset_t *rdataset;
- dns_rdataset_t *sigrdataset;
- dns_valarg_t *valarg;
- dns_adbaddrinfo_t *addrinfo;
-
- UNUSED(task); /* for now */
-
- REQUIRE(event->ev_type == DNS_EVENT_VALIDATORDONE);
- valarg = event->ev_arg;
- fctx = valarg->fctx;
- addrinfo = valarg->addrinfo;
- REQUIRE(VALID_FCTX(fctx));
- REQUIRE(!ISC_LIST_EMPTY(fctx->validators));
-
- vevent = (dns_validatorevent_t *)event;
-
- FCTXTRACE("received validation completion event");
-
- ISC_LIST_UNLINK(fctx->validators, vevent->validator, link);
-
- /*
- * Destroy the validator early so that we can
- * destroy the fctx if necessary.
- */
- dns_validator_destroy(&vevent->validator);
- isc_mem_put(fctx->res->mctx, valarg, sizeof(*valarg));
-
- negative = ISC_TF(vevent->rdataset == NULL);
-
- sentresponse = ISC_TF((fctx->options & DNS_FETCHOPT_NOVALIDATE) != 0);
-
- /*
- * If shutting down, ignore the results. Check to see if we're
- * done waiting for validator completions and ADB pending events; if
- * so, destroy the fctx.
- */
- if (SHUTTINGDOWN(fctx) && !sentresponse) {
- maybe_destroy(fctx); /* Locks bucket. */
- goto cleanup_event;
- }
-
- LOCK(&fctx->res->buckets[fctx->bucketnum].lock);
-
- /*
- * If chaining, we need to make sure that the right result code is
- * returned, and that the rdatasets are bound.
- */
- if (vevent->result == ISC_R_SUCCESS &&
- !negative &&
- vevent->rdataset != NULL &&
- CHAINING(vevent->rdataset))
- {
- if (vevent->rdataset->type == dns_rdatatype_cname)
- eresult = DNS_R_CNAME;
- else {
- INSIST(vevent->rdataset->type == dns_rdatatype_dname);
- eresult = DNS_R_DNAME;
- }
- chaining = ISC_TRUE;
- } else
- chaining = ISC_FALSE;
-
- /*
- * Either we're not shutting down, or we are shutting down but want
- * to cache the result anyway (if this was a validation started by
- * a query with cd set)
- */
-
- hevent = ISC_LIST_HEAD(fctx->events);
- if (hevent != NULL) {
- if (!negative && !chaining &&
- (fctx->type == dns_rdatatype_any ||
- fctx->type == dns_rdatatype_rrsig ||
- fctx->type == dns_rdatatype_sig)) {
- /*
- * Don't bind rdatasets; the caller
- * will iterate the node.
- */
- } else {
- ardataset = hevent->rdataset;
- asigrdataset = hevent->sigrdataset;
- }
- }
-
- if (vevent->result != ISC_R_SUCCESS) {
- FCTXTRACE("validation failed");
- result = ISC_R_NOTFOUND;
- if (vevent->rdataset != NULL)
- result = dns_db_findnode(fctx->cache, vevent->name,
- ISC_TRUE, &node);
- if (result == ISC_R_SUCCESS)
- (void)dns_db_deleterdataset(fctx->cache, node, NULL,
- vevent->type, 0);
- if (result == ISC_R_SUCCESS && vevent->sigrdataset != NULL)
- (void)dns_db_deleterdataset(fctx->cache, node, NULL,
- dns_rdatatype_rrsig,
- vevent->type);
- if (result == ISC_R_SUCCESS)
- dns_db_detachnode(fctx->cache, &node);
- result = vevent->result;
- add_bad(fctx, &addrinfo->sockaddr, result);
- isc_event_free(&event);
- UNLOCK(&fctx->res->buckets[fctx->bucketnum].lock);
- if (!ISC_LIST_EMPTY(fctx->validators))
- dns_validator_send(ISC_LIST_HEAD(fctx->validators));
- else if (sentresponse)
- fctx_done(fctx, result); /* Locks bucket. */
- else
- fctx_try(fctx); /* Locks bucket. */
- return;
- }
-
- isc_stdtime_get(&now);
-
- if (negative) {
- dns_rdatatype_t covers;
- FCTXTRACE("nonexistence validation OK");
-
- if (fctx->rmessage->rcode == dns_rcode_nxdomain)
- covers = dns_rdatatype_any;
- else
- covers = fctx->type;
-
- result = dns_db_findnode(fctx->cache, vevent->name, ISC_TRUE,
- &node);
- if (result != ISC_R_SUCCESS)
- goto noanswer_response;
-
- /*
- * If we are asking for a SOA record set the cache time
- * to zero to facilitate locating the containing zone of
- * a arbitary zone.
- */
- ttl = fctx->res->view->maxncachettl;
- if (fctx->type == dns_rdatatype_soa &&
- covers == dns_rdatatype_any)
- ttl = 0;
-
- result = ncache_adderesult(fctx->rmessage, fctx->cache, node,
- covers, now, ttl,
- ardataset, &eresult);
- if (result != ISC_R_SUCCESS)
- goto noanswer_response;
- goto answer_response;
- }
-
- FCTXTRACE("validation OK");
-
- if (vevent->proofs[DNS_VALIDATOR_NOQNAMEPROOF] != NULL) {
-
- result = dns_rdataset_addnoqname(vevent->rdataset,
- vevent->proofs[DNS_VALIDATOR_NOQNAMEPROOF]);
- RUNTIME_CHECK(result == ISC_R_SUCCESS);
- INSIST(vevent->sigrdataset != NULL);
- vevent->sigrdataset->ttl = vevent->rdataset->ttl;
- }
-
- /*
- * The data was already cached as pending data.
- * Re-cache it as secure and bind the cached
- * rdatasets to the first event on the fetch
- * event list.
- */
- result = dns_db_findnode(fctx->cache, vevent->name, ISC_TRUE, &node);
- if (result != ISC_R_SUCCESS)
- goto noanswer_response;
-
- result = dns_db_addrdataset(fctx->cache, node, NULL, now,
- vevent->rdataset, 0, ardataset);
- if (result != ISC_R_SUCCESS &&
- result != DNS_R_UNCHANGED)
- goto noanswer_response;
- if (vevent->sigrdataset != NULL) {
- result = dns_db_addrdataset(fctx->cache, node, NULL, now,
- vevent->sigrdataset, 0,
- asigrdataset);
- if (result != ISC_R_SUCCESS &&
- result != DNS_R_UNCHANGED)
- goto noanswer_response;
- }
-
- if (sentresponse) {
- /*
- * If we only deferred the destroy because we wanted to cache
- * the data, destroy now.
- */
- UNLOCK(&fctx->res->buckets[fctx->bucketnum].lock);
- if (SHUTTINGDOWN(fctx))
- maybe_destroy(fctx); /* Locks bucket. */
- goto cleanup_event;
- }
-
- if (!ISC_LIST_EMPTY(fctx->validators)) {
- INSIST(!negative);
- INSIST(fctx->type == dns_rdatatype_any ||
- fctx->type == dns_rdatatype_rrsig ||
- fctx->type == dns_rdatatype_sig);
- /*
- * Don't send a response yet - we have
- * more rdatasets that still need to
- * be validated.
- */
- UNLOCK(&fctx->res->buckets[fctx->bucketnum].lock);
- dns_validator_send(ISC_LIST_HEAD(fctx->validators));
- goto cleanup_event;
- }
-
- answer_response:
- /*
- * Cache any NS/NSEC records that happened to be validated.
- */
- result = dns_message_firstname(fctx->rmessage, DNS_SECTION_AUTHORITY);
- while (result == ISC_R_SUCCESS) {
- name = NULL;
- dns_message_currentname(fctx->rmessage, DNS_SECTION_AUTHORITY,
- &name);
- for (rdataset = ISC_LIST_HEAD(name->list);
- rdataset != NULL;
- rdataset = ISC_LIST_NEXT(rdataset, link)) {
- if ((rdataset->type != dns_rdatatype_ns &&
- rdataset->type != dns_rdatatype_nsec) ||
- rdataset->trust != dns_trust_secure)
- continue;
- for (sigrdataset = ISC_LIST_HEAD(name->list);
- sigrdataset != NULL;
- sigrdataset = ISC_LIST_NEXT(sigrdataset, link)) {
- if (sigrdataset->type != dns_rdatatype_rrsig ||
- sigrdataset->covers != rdataset->type)
- continue;
- break;
- }
- if (sigrdataset == NULL ||
- sigrdataset->trust != dns_trust_secure)
- continue;
- result = dns_db_findnode(fctx->cache, name, ISC_TRUE,
- &nsnode);
- if (result != ISC_R_SUCCESS)
- continue;
-
- result = dns_db_addrdataset(fctx->cache, nsnode, NULL,
- now, rdataset, 0, NULL);
- if (result == ISC_R_SUCCESS)
- result = dns_db_addrdataset(fctx->cache, nsnode,
- NULL, now,
- sigrdataset, 0,
- NULL);
- dns_db_detachnode(fctx->cache, &nsnode);
- }
- result = dns_message_nextname(fctx->rmessage,
- DNS_SECTION_AUTHORITY);
- }
-
- result = ISC_R_SUCCESS;
-
- /*
- * Respond with an answer, positive or negative,
- * as opposed to an error. 'node' must be non-NULL.
- */
-
- fctx->attributes |= FCTX_ATTR_HAVEANSWER;
-
- if (hevent != NULL) {
- hevent->result = eresult;
- RUNTIME_CHECK(dns_name_copy(vevent->name,
- dns_fixedname_name(&hevent->foundname), NULL)
- == ISC_R_SUCCESS);
- dns_db_attach(fctx->cache, &hevent->db);
- hevent->node = node;
- node = NULL;
- clone_results(fctx);
- }
-
- noanswer_response:
- if (node != NULL)
- dns_db_detachnode(fctx->cache, &node);
-
- UNLOCK(&fctx->res->buckets[fctx->bucketnum].lock);
-
- fctx_done(fctx, result); /* Locks bucket. */
-
- cleanup_event:
- isc_event_free(&event);
-}
-
-static inline isc_result_t
-cache_name(fetchctx_t *fctx, dns_name_t *name, dns_adbaddrinfo_t *addrinfo,
- isc_stdtime_t now) {
- dns_rdataset_t *rdataset, *sigrdataset;
- dns_rdataset_t *addedrdataset, *ardataset, *asigrdataset;
- dns_rdataset_t *valrdataset = NULL, *valsigrdataset = NULL;
- dns_dbnode_t *node, **anodep;
- dns_db_t **adbp;
- dns_name_t *aname;
- dns_resolver_t *res;
- isc_boolean_t need_validation, secure_domain, have_answer;
- isc_result_t result, eresult;
- dns_fetchevent_t *event;
- unsigned int options;
- isc_task_t *task;
- isc_boolean_t fail;
- unsigned int valoptions = 0;
-
- /*
- * The appropriate bucket lock must be held.
- */
-
- res = fctx->res;
- need_validation = ISC_FALSE;
- secure_domain = ISC_FALSE;
- have_answer = ISC_FALSE;
- eresult = ISC_R_SUCCESS;
- task = res->buckets[fctx->bucketnum].task;
-
- /*
- * Is DNSSEC validation required for this name?
- */
- result = dns_keytable_issecuredomain(res->view->secroots, name,
- &secure_domain);
- if (result != ISC_R_SUCCESS)
- return (result);
-
- if (!secure_domain && res->view->dlv != NULL) {
- valoptions = DNS_VALIDATOR_DLV;
- secure_domain = ISC_TRUE;
- }
-
- if ((fctx->options & DNS_FETCHOPT_NOVALIDATE) != 0)
- need_validation = ISC_FALSE;
- else
- need_validation = secure_domain;
-
- adbp = NULL;
- aname = NULL;
- anodep = NULL;
- ardataset = NULL;
- asigrdataset = NULL;
- event = NULL;
- if ((name->attributes & DNS_NAMEATTR_ANSWER) != 0 &&
- !need_validation) {
- have_answer = ISC_TRUE;
- event = ISC_LIST_HEAD(fctx->events);
- if (event != NULL) {
- adbp = &event->db;
- aname = dns_fixedname_name(&event->foundname);
- result = dns_name_copy(name, aname, NULL);
- if (result != ISC_R_SUCCESS)
- return (result);
- anodep = &event->node;
- /*
- * If this is an ANY, SIG or RRSIG query, we're not
- * going to return any rdatasets, unless we encountered
- * a CNAME or DNAME as "the answer". In this case,
- * we're going to return DNS_R_CNAME or DNS_R_DNAME
- * and we must set up the rdatasets.
- */
- if ((fctx->type != dns_rdatatype_any &&
- fctx->type != dns_rdatatype_rrsig &&
- fctx->type != dns_rdatatype_sig) ||
- (name->attributes & DNS_NAMEATTR_CHAINING) != 0) {
- ardataset = event->rdataset;
- asigrdataset = event->sigrdataset;
- }
- }
- }
-
- /*
- * Find or create the cache node.
- */
- node = NULL;
- result = dns_db_findnode(fctx->cache, name, ISC_TRUE, &node);
- if (result != ISC_R_SUCCESS)
- return (result);
-
- /*
- * Cache or validate each cacheable rdataset.
- */
- fail = ISC_TF((fctx->res->options & DNS_RESOLVER_CHECKNAMESFAIL) != 0);
- for (rdataset = ISC_LIST_HEAD(name->list);
- rdataset != NULL;
- rdataset = ISC_LIST_NEXT(rdataset, link)) {
- if (!CACHE(rdataset))
- continue;
- if (CHECKNAMES(rdataset)) {
- char namebuf[DNS_NAME_FORMATSIZE];
- char typebuf[DNS_RDATATYPE_FORMATSIZE];
- char classbuf[DNS_RDATATYPE_FORMATSIZE];
-
- dns_name_format(name, namebuf, sizeof(namebuf));
- dns_rdatatype_format(rdataset->type, typebuf,
- sizeof(typebuf));
- dns_rdataclass_format(rdataset->rdclass, classbuf,
- sizeof(classbuf));
- isc_log_write(dns_lctx, DNS_LOGCATEGORY_RESOLVER,
- DNS_LOGMODULE_RESOLVER, ISC_LOG_NOTICE,
- "check-names %s %s/%s/%s",
- fail ? "failure" : "warning",
- namebuf, typebuf, classbuf);
- if (fail) {
- if (ANSWER(rdataset))
- return (DNS_R_BADNAME);
- continue;
- }
- }
-
- /*
- * Enforce the configure maximum cache TTL.
- */
- if (rdataset->ttl > res->view->maxcachettl)
- rdataset->ttl = res->view->maxcachettl;
-
- /*
- * If this rrset is in a secure domain, do DNSSEC validation
- * for it, unless it is glue.
- */
- if (secure_domain && rdataset->trust != dns_trust_glue) {
- /*
- * RRSIGs are validated as part of validating the
- * type they cover.
- */
- if (rdataset->type == dns_rdatatype_rrsig)
- continue;
- /*
- * Find the SIG for this rdataset, if we have it.
- */
- for (sigrdataset = ISC_LIST_HEAD(name->list);
- sigrdataset != NULL;
- sigrdataset = ISC_LIST_NEXT(sigrdataset, link)) {
- if (sigrdataset->type == dns_rdatatype_rrsig &&
- sigrdataset->covers == rdataset->type)
- break;
- }
- if (sigrdataset == NULL) {
- if (!ANSWER(rdataset) && need_validation) {
- /*
- * Ignore non-answer rdatasets that
- * are missing signatures.
- */
- continue;
- }
- }
-
- /*
- * Normalize the rdataset and sigrdataset TTLs.
- */
- if (sigrdataset != NULL) {
- rdataset->ttl = ISC_MIN(rdataset->ttl,
- sigrdataset->ttl);
- sigrdataset->ttl = rdataset->ttl;
- }
-
- /*
- * Cache this rdataset/sigrdataset pair as
- * pending data.
- */
- rdataset->trust = dns_trust_pending;
- if (sigrdataset != NULL)
- sigrdataset->trust = dns_trust_pending;
- if (!need_validation)
- addedrdataset = ardataset;
- else
- addedrdataset = NULL;
- result = dns_db_addrdataset(fctx->cache, node, NULL,
- now, rdataset, 0,
- addedrdataset);
- if (result == DNS_R_UNCHANGED)
- result = ISC_R_SUCCESS;
- if (result != ISC_R_SUCCESS)
- break;
- if (sigrdataset != NULL) {
- if (!need_validation)
- addedrdataset = asigrdataset;
- else
- addedrdataset = NULL;
- result = dns_db_addrdataset(fctx->cache,
- node, NULL, now,
- sigrdataset, 0,
- addedrdataset);
- if (result == DNS_R_UNCHANGED)
- result = ISC_R_SUCCESS;
- if (result != ISC_R_SUCCESS)
- break;
- } else if (!ANSWER(rdataset))
- continue;
-
- if (ANSWER(rdataset) && need_validation) {
- if (fctx->type != dns_rdatatype_any &&
- fctx->type != dns_rdatatype_rrsig &&
- fctx->type != dns_rdatatype_sig) {
- /*
- * This is The Answer. We will
- * validate it, but first we cache
- * the rest of the response - it may
- * contain useful keys.
- */
- INSIST(valrdataset == NULL &&
- valsigrdataset == NULL);
- valrdataset = rdataset;
- valsigrdataset = sigrdataset;
- } else {
- /*
- * This is one of (potentially)
- * multiple answers to an ANY
- * or SIG query. To keep things
- * simple, we just start the
- * validator right away rather
- * than caching first and
- * having to remember which
- * rdatasets needed validation.
- */
- result = valcreate(fctx, addrinfo,
- name, rdataset->type,
- rdataset,
- sigrdataset,
- valoptions, task);
- /*
- * Defer any further validations.
- * This prevents multiple validators
- * from manipulating fctx->rmessage
- * simultaniously.
- */
- valoptions |= DNS_VALIDATOR_DEFER;
- }
- } else if (CHAINING(rdataset)) {
- if (rdataset->type == dns_rdatatype_cname)
- eresult = DNS_R_CNAME;
- else {
- INSIST(rdataset->type ==
- dns_rdatatype_dname);
- eresult = DNS_R_DNAME;
- }
- }
- } else if (!EXTERNAL(rdataset)) {
- /*
- * It's OK to cache this rdataset now.
- */
- if (ANSWER(rdataset))
- addedrdataset = ardataset;
- else if (ANSWERSIG(rdataset))
- addedrdataset = asigrdataset;
- else
- addedrdataset = NULL;
- if (CHAINING(rdataset)) {
- if (rdataset->type == dns_rdatatype_cname)
- eresult = DNS_R_CNAME;
- else {
- INSIST(rdataset->type ==
- dns_rdatatype_dname);
- eresult = DNS_R_DNAME;
- }
- }
- if (rdataset->trust == dns_trust_glue &&
- (rdataset->type == dns_rdatatype_ns ||
- (rdataset->type == dns_rdatatype_rrsig &&
- rdataset->covers == dns_rdatatype_ns))) {
- /*
- * If the trust level is 'dns_trust_glue'
- * then we are adding data from a referral
- * we got while executing the search algorithm.
- * New referral data always takes precedence
- * over the existing cache contents.
- */
- options = DNS_DBADD_FORCE;
- } else
- options = 0;
- /*
- * Now we can add the rdataset.
- */
- result = dns_db_addrdataset(fctx->cache,
- node, NULL, now,
- rdataset,
- options,
- addedrdataset);
- if (result == DNS_R_UNCHANGED) {
- if (ANSWER(rdataset) &&
- ardataset != NULL &&
- ardataset->type == 0) {
- /*
- * The answer in the cache is better
- * than the answer we found, and is
- * a negative cache entry, so we
- * must set eresult appropriately.
- */
- if (NXDOMAIN(ardataset))
- eresult =
- DNS_R_NCACHENXDOMAIN;
- else
- eresult =
- DNS_R_NCACHENXRRSET;
- }
- result = ISC_R_SUCCESS;
- } else if (result != ISC_R_SUCCESS)
- break;
- }
- }
-
- if (valrdataset != NULL)
- result = valcreate(fctx, addrinfo, name, fctx->type,
- valrdataset, valsigrdataset, valoptions,
- task);
-
- if (result == ISC_R_SUCCESS && have_answer) {
- fctx->attributes |= FCTX_ATTR_HAVEANSWER;
- if (event != NULL) {
- event->result = eresult;
- dns_db_attach(fctx->cache, adbp);
- *anodep = node;
- node = NULL;
- clone_results(fctx);
- }
- }
-
- if (node != NULL)
- dns_db_detachnode(fctx->cache, &node);
-
- return (result);
-}
-
-static inline isc_result_t
-cache_message(fetchctx_t *fctx, dns_adbaddrinfo_t *addrinfo, isc_stdtime_t now)
-{
- isc_result_t result;
- dns_section_t section;
- dns_name_t *name;
-
- FCTXTRACE("cache_message");
-
- fctx->attributes &= ~FCTX_ATTR_WANTCACHE;
-
- LOCK(&fctx->res->buckets[fctx->bucketnum].lock);
-
- for (section = DNS_SECTION_ANSWER;
- section <= DNS_SECTION_ADDITIONAL;
- section++) {
- result = dns_message_firstname(fctx->rmessage, section);
- while (result == ISC_R_SUCCESS) {
- name = NULL;
- dns_message_currentname(fctx->rmessage, section,
- &name);
- if ((name->attributes & DNS_NAMEATTR_CACHE) != 0) {
- result = cache_name(fctx, name, addrinfo, now);
- if (result != ISC_R_SUCCESS)
- break;
- }
- result = dns_message_nextname(fctx->rmessage, section);
- }
- if (result != ISC_R_NOMORE)
- break;
- }
- if (result == ISC_R_NOMORE)
- result = ISC_R_SUCCESS;
-
- UNLOCK(&fctx->res->buckets[fctx->bucketnum].lock);
-
- return (result);
-}
-
-/*
- * Do what dns_ncache_add() does, and then compute an appropriate eresult.
- */
-static isc_result_t
-ncache_adderesult(dns_message_t *message, dns_db_t *cache, dns_dbnode_t *node,
- dns_rdatatype_t covers, isc_stdtime_t now, dns_ttl_t maxttl,
- dns_rdataset_t *ardataset,
- isc_result_t *eresultp)
-{
- isc_result_t result;
- dns_rdataset_t rdataset;
-
- if (ardataset == NULL) {
- dns_rdataset_init(&rdataset);
- ardataset = &rdataset;
- }
- result = dns_ncache_add(message, cache, node, covers, now,
- maxttl, ardataset);
- if (result == DNS_R_UNCHANGED || result == ISC_R_SUCCESS) {
- /*
- * If the cache now contains a negative entry and we
- * care about whether it is DNS_R_NCACHENXDOMAIN or
- * DNS_R_NCACHENXRRSET then extract it.
- */
- if (ardataset->type == 0) {
- /*
- * The cache data is a negative cache entry.
- */
- if (NXDOMAIN(ardataset))
- *eresultp = DNS_R_NCACHENXDOMAIN;
- else
- *eresultp = DNS_R_NCACHENXRRSET;
- } else {
- /*
- * Either we don't care about the nature of the
- * cache rdataset (because no fetch is interested
- * in the outcome), or the cache rdataset is not
- * a negative cache entry. Whichever case it is,
- * we can return success.
- *
- * XXXRTH There's a CNAME/DNAME problem here.
- */
- *eresultp = ISC_R_SUCCESS;
- }
- result = ISC_R_SUCCESS;
- }
- if (ardataset == &rdataset && dns_rdataset_isassociated(ardataset))
- dns_rdataset_disassociate(ardataset);
-
- return (result);
-}
-
-static inline isc_result_t
-ncache_message(fetchctx_t *fctx, dns_adbaddrinfo_t *addrinfo,
- dns_rdatatype_t covers, isc_stdtime_t now)
-{
- isc_result_t result, eresult;
- dns_name_t *name;
- dns_resolver_t *res;
- dns_db_t **adbp;
- dns_dbnode_t *node, **anodep;
- dns_rdataset_t *ardataset;
- isc_boolean_t need_validation, secure_domain;
- dns_name_t *aname;
- dns_fetchevent_t *event;
- isc_uint32_t ttl;
- unsigned int valoptions = 0;
-
- FCTXTRACE("ncache_message");
-
- fctx->attributes &= ~FCTX_ATTR_WANTNCACHE;
-
- res = fctx->res;
- need_validation = ISC_FALSE;
- secure_domain = ISC_FALSE;
- eresult = ISC_R_SUCCESS;
- name = &fctx->name;
- node = NULL;
-
- /*
- * XXXMPA remove when we follow cnames and adjust the setting
- * of FCTX_ATTR_WANTNCACHE in noanswer_response().
- */
- INSIST(fctx->rmessage->counts[DNS_SECTION_ANSWER] == 0);
-
- /*
- * Is DNSSEC validation required for this name?
- */
- result = dns_keytable_issecuredomain(res->view->secroots, name,
- &secure_domain);
- if (result != ISC_R_SUCCESS)
- return (result);
-
- if (!secure_domain && res->view->dlv != NULL) {
- valoptions = DNS_VALIDATOR_DLV;
- secure_domain = ISC_TRUE;
- }
-
- if ((fctx->options & DNS_FETCHOPT_NOVALIDATE) != 0)
- need_validation = ISC_FALSE;
- else
- need_validation = secure_domain;
-
- if (secure_domain) {
- /*
- * Mark all rdatasets as pending.
- */
- dns_rdataset_t *trdataset;
- dns_name_t *tname;
-
- result = dns_message_firstname(fctx->rmessage,
- DNS_SECTION_AUTHORITY);
- while (result == ISC_R_SUCCESS) {
- tname = NULL;
- dns_message_currentname(fctx->rmessage,
- DNS_SECTION_AUTHORITY,
- &tname);
- for (trdataset = ISC_LIST_HEAD(tname->list);
- trdataset != NULL;
- trdataset = ISC_LIST_NEXT(trdataset, link))
- trdataset->trust = dns_trust_pending;
- result = dns_message_nextname(fctx->rmessage,
- DNS_SECTION_AUTHORITY);
- }
- if (result != ISC_R_NOMORE)
- return (result);
-
- }
-
- if (need_validation) {
- /*
- * Do negative response validation.
- */
- result = valcreate(fctx, addrinfo, name, fctx->type,
- NULL, NULL, valoptions,
- res->buckets[fctx->bucketnum].task);
- /*
- * If validation is necessary, return now. Otherwise continue
- * to process the message, letting the validation complete
- * in its own good time.
- */
- return (result);
- }
-
- LOCK(&res->buckets[fctx->bucketnum].lock);
-
- adbp = NULL;
- aname = NULL;
- anodep = NULL;
- ardataset = NULL;
- if (!HAVE_ANSWER(fctx)) {
- event = ISC_LIST_HEAD(fctx->events);
- if (event != NULL) {
- adbp = &event->db;
- aname = dns_fixedname_name(&event->foundname);
- result = dns_name_copy(name, aname, NULL);
- if (result != ISC_R_SUCCESS)
- goto unlock;
- anodep = &event->node;
- ardataset = event->rdataset;
- }
- } else
- event = NULL;
-
- result = dns_db_findnode(fctx->cache, name, ISC_TRUE, &node);
- if (result != ISC_R_SUCCESS)
- goto unlock;
-
- /*
- * If we are asking for a SOA record set the cache time
- * to zero to facilitate locating the containing zone of
- * a arbitary zone.
- */
- ttl = fctx->res->view->maxncachettl;
- if (fctx->type == dns_rdatatype_soa &&
- covers == dns_rdatatype_any)
- ttl = 0;
-
- result = ncache_adderesult(fctx->rmessage, fctx->cache, node,
- covers, now, ttl, ardataset, &eresult);
- if (result != ISC_R_SUCCESS)
- goto unlock;
-
- if (!HAVE_ANSWER(fctx)) {
- fctx->attributes |= FCTX_ATTR_HAVEANSWER;
- if (event != NULL) {
- event->result = eresult;
- dns_db_attach(fctx->cache, adbp);
- *anodep = node;
- node = NULL;
- clone_results(fctx);
- }
- }
-
- unlock:
- UNLOCK(&res->buckets[fctx->bucketnum].lock);
-
- if (node != NULL)
- dns_db_detachnode(fctx->cache, &node);
-
- return (result);
-}
-
-static inline void
-mark_related(dns_name_t *name, dns_rdataset_t *rdataset,
- isc_boolean_t external, isc_boolean_t gluing)
-{
- name->attributes |= DNS_NAMEATTR_CACHE;
- if (gluing) {
- rdataset->trust = dns_trust_glue;
- /*
- * Glue with 0 TTL causes problems. We force the TTL to
- * 1 second to prevent this.
- */
- if (rdataset->ttl == 0)
- rdataset->ttl = 1;
- } else
- rdataset->trust = dns_trust_additional;
- /*
- * Avoid infinite loops by only marking new rdatasets.
- */
- if (!CACHE(rdataset)) {
- name->attributes |= DNS_NAMEATTR_CHASE;
- rdataset->attributes |= DNS_RDATASETATTR_CHASE;
- }
- rdataset->attributes |= DNS_RDATASETATTR_CACHE;
- if (external)
- rdataset->attributes |= DNS_RDATASETATTR_EXTERNAL;
-}
-
-static isc_result_t
-check_related(void *arg, dns_name_t *addname, dns_rdatatype_t type) {
- fetchctx_t *fctx = arg;
- isc_result_t result;
- dns_name_t *name;
- dns_rdataset_t *rdataset;
- isc_boolean_t external;
- dns_rdatatype_t rtype;
- isc_boolean_t gluing;
-
- REQUIRE(VALID_FCTX(fctx));
-
- if (GLUING(fctx))
- gluing = ISC_TRUE;
- else
- gluing = ISC_FALSE;
- name = NULL;
- rdataset = NULL;
- result = dns_message_findname(fctx->rmessage, DNS_SECTION_ADDITIONAL,
- addname, dns_rdatatype_any, 0, &name,
- NULL);
- if (result == ISC_R_SUCCESS) {
- external = ISC_TF(!dns_name_issubdomain(name, &fctx->domain));
- if (type == dns_rdatatype_a) {
- for (rdataset = ISC_LIST_HEAD(name->list);
- rdataset != NULL;
- rdataset = ISC_LIST_NEXT(rdataset, link)) {
- if (rdataset->type == dns_rdatatype_rrsig)
- rtype = rdataset->covers;
- else
- rtype = rdataset->type;
- if (rtype == dns_rdatatype_a ||
- rtype == dns_rdatatype_aaaa)
- mark_related(name, rdataset, external,
- gluing);
- }
- } else {
- result = dns_message_findtype(name, type, 0,
- &rdataset);
- if (result == ISC_R_SUCCESS) {
- mark_related(name, rdataset, external, gluing);
- /*
- * Do we have its SIG too?
- */
- rdataset = NULL;
- result = dns_message_findtype(name,
- dns_rdatatype_rrsig,
- type, &rdataset);
- if (result == ISC_R_SUCCESS)
- mark_related(name, rdataset, external,
- gluing);
- }
- }
- }
-
- return (ISC_R_SUCCESS);
-}
-
-static void
-chase_additional(fetchctx_t *fctx) {
- isc_boolean_t rescan;
- dns_section_t section = DNS_SECTION_ADDITIONAL;
- isc_result_t result;
-
- again:
- rescan = ISC_FALSE;
-
- for (result = dns_message_firstname(fctx->rmessage, section);
- result == ISC_R_SUCCESS;
- result = dns_message_nextname(fctx->rmessage, section)) {
- dns_name_t *name = NULL;
- dns_rdataset_t *rdataset;
- dns_message_currentname(fctx->rmessage, DNS_SECTION_ADDITIONAL,
- &name);
- if ((name->attributes & DNS_NAMEATTR_CHASE) == 0)
- continue;
- name->attributes &= ~DNS_NAMEATTR_CHASE;
- for (rdataset = ISC_LIST_HEAD(name->list);
- rdataset != NULL;
- rdataset = ISC_LIST_NEXT(rdataset, link)) {
- if (CHASE(rdataset)) {
- rdataset->attributes &= ~DNS_RDATASETATTR_CHASE;
- (void)dns_rdataset_additionaldata(rdataset,
- check_related,
- fctx);
- rescan = ISC_TRUE;
- }
- }
- }
- if (rescan)
- goto again;
-}
-
-static inline isc_result_t
-cname_target(dns_rdataset_t *rdataset, dns_name_t *tname) {
- isc_result_t result;
- dns_rdata_t rdata = DNS_RDATA_INIT;
- dns_rdata_cname_t cname;
-
- result = dns_rdataset_first(rdataset);
- if (result != ISC_R_SUCCESS)
- return (result);
- dns_rdataset_current(rdataset, &rdata);
- result = dns_rdata_tostruct(&rdata, &cname, NULL);
- if (result != ISC_R_SUCCESS)
- return (result);
- dns_name_init(tname, NULL);
- dns_name_clone(&cname.cname, tname);
- dns_rdata_freestruct(&cname);
-
- return (ISC_R_SUCCESS);
-}
-
-static inline isc_result_t
-dname_target(dns_rdataset_t *rdataset, dns_name_t *qname, dns_name_t *oname,
- dns_fixedname_t *fixeddname)
-{
- isc_result_t result;
- dns_rdata_t rdata = DNS_RDATA_INIT;
- unsigned int nlabels;
- int order;
- dns_namereln_t namereln;
- dns_rdata_dname_t dname;
- dns_fixedname_t prefix;
-
- /*
- * Get the target name of the DNAME.
- */
-
- result = dns_rdataset_first(rdataset);
- if (result != ISC_R_SUCCESS)
- return (result);
- dns_rdataset_current(rdataset, &rdata);
- result = dns_rdata_tostruct(&rdata, &dname, NULL);
- if (result != ISC_R_SUCCESS)
- return (result);
-
- /*
- * Get the prefix of qname.
- */
- namereln = dns_name_fullcompare(qname, oname, &order, &nlabels);
- if (namereln != dns_namereln_subdomain) {
- dns_rdata_freestruct(&dname);
- return (DNS_R_FORMERR);
- }
- dns_fixedname_init(&prefix);
- dns_name_split(qname, nlabels, dns_fixedname_name(&prefix), NULL);
- dns_fixedname_init(fixeddname);
- result = dns_name_concatenate(dns_fixedname_name(&prefix),
- &dname.dname,
- dns_fixedname_name(fixeddname), NULL);
- dns_rdata_freestruct(&dname);
- return (result);
-}
-
-/*
- * Handle a no-answer response (NXDOMAIN, NXRRSET, or referral).
- * If bind8_ns_resp is ISC_TRUE, this is a suspected BIND 8
- * response to an NS query that should be treated as a referral
- * even though the NS records occur in the answer section
- * rather than the authority section.
- */
-static isc_result_t
-noanswer_response(fetchctx_t *fctx, dns_name_t *oqname,
- isc_boolean_t bind8_ns_resp)
-{
- isc_result_t result;
- dns_message_t *message;
- dns_name_t *name, *qname, *ns_name, *soa_name, *ds_name;
- dns_rdataset_t *rdataset, *ns_rdataset;
- isc_boolean_t done, aa, negative_response;
- dns_rdatatype_t type;
- dns_section_t section =
- bind8_ns_resp ? DNS_SECTION_ANSWER : DNS_SECTION_AUTHORITY;
-
- FCTXTRACE("noanswer_response");
-
- message = fctx->rmessage;
-
- /*
- * Setup qname.
- */
- if (oqname == NULL) {
- /*
- * We have a normal, non-chained negative response or
- * referral.
- */
- if ((message->flags & DNS_MESSAGEFLAG_AA) != 0)
- aa = ISC_TRUE;
- else
- aa = ISC_FALSE;
- qname = &fctx->name;
- } else {
- /*
- * We're being invoked by answer_response() after it has
- * followed a CNAME/DNAME chain.
- */
- qname = oqname;
- aa = ISC_FALSE;
- /*
- * If the current qname is not a subdomain of the query
- * domain, there's no point in looking at the authority
- * section without doing DNSSEC validation.
- *
- * Until we do that validation, we'll just return success
- * in this case.
- */
- if (!dns_name_issubdomain(qname, &fctx->domain))
- return (ISC_R_SUCCESS);
- }
-
- /*
- * We have to figure out if this is a negative response, or a
- * referral.
- */
-
- /*
- * Sometimes we can tell if its a negative response by looking at
- * the message header.
- */
- negative_response = ISC_FALSE;
- if (message->rcode == dns_rcode_nxdomain ||
- (message->counts[DNS_SECTION_ANSWER] == 0 &&
- message->counts[DNS_SECTION_AUTHORITY] == 0))
- negative_response = ISC_TRUE;
-
- /*
- * Process the authority section.
- */
- done = ISC_FALSE;
- ns_name = NULL;
- ns_rdataset = NULL;
- soa_name = NULL;
- ds_name = NULL;
- result = dns_message_firstname(message, section);
- while (!done && result == ISC_R_SUCCESS) {
- name = NULL;
- dns_message_currentname(message, section, &name);
- if (dns_name_issubdomain(name, &fctx->domain)) {
- /*
- * Look for NS/SOA RRsets first.
- */
- for (rdataset = ISC_LIST_HEAD(name->list);
- rdataset != NULL;
- rdataset = ISC_LIST_NEXT(rdataset, link)) {
- type = rdataset->type;
- if (type == dns_rdatatype_rrsig)
- type = rdataset->covers;
- if (((type == dns_rdatatype_ns ||
- type == dns_rdatatype_soa) &&
- !dns_name_issubdomain(qname, name)))
- return (DNS_R_FORMERR);
- if (type == dns_rdatatype_ns) {
- /*
- * NS or RRSIG NS.
- *
- * Only one set of NS RRs is allowed.
- */
- if (rdataset->type ==
- dns_rdatatype_ns) {
- if (ns_name != NULL &&
- name != ns_name)
- return (DNS_R_FORMERR);
- ns_name = name;
- ns_rdataset = rdataset;
- }
- name->attributes |=
- DNS_NAMEATTR_CACHE;
- rdataset->attributes |=
- DNS_RDATASETATTR_CACHE;
- rdataset->trust = dns_trust_glue;
- }
- if (type == dns_rdatatype_soa) {
- /*
- * SOA, or RRSIG SOA.
- *
- * Only one SOA is allowed.
- */
- if (rdataset->type ==
- dns_rdatatype_soa) {
- if (soa_name != NULL &&
- name != soa_name)
- return (DNS_R_FORMERR);
- soa_name = name;
- }
- name->attributes |=
- DNS_NAMEATTR_NCACHE;
- rdataset->attributes |=
- DNS_RDATASETATTR_NCACHE;
- if (aa)
- rdataset->trust =
- dns_trust_authauthority;
- else
- rdataset->trust =
- dns_trust_additional;
- }
- }
- /*
- * A negative response has a SOA record (Type 2)
- * and a optional NS RRset (Type 1) or it has neither
- * a SOA or a NS RRset (Type 3, handled above) or
- * rcode is NXDOMAIN (handled above) in which case
- * the NS RRset is allowed (Type 4).
- */
- if (soa_name != NULL)
- negative_response = ISC_TRUE;
- for (rdataset = ISC_LIST_HEAD(name->list);
- rdataset != NULL;
- rdataset = ISC_LIST_NEXT(rdataset, link)) {
- type = rdataset->type;
- if (type == dns_rdatatype_rrsig)
- type = rdataset->covers;
- if (type == dns_rdatatype_nsec) {
- /*
- * NSEC or RRSIG NSEC.
- */
- if (negative_response) {
- name->attributes |=
- DNS_NAMEATTR_NCACHE;
- rdataset->attributes |=
- DNS_RDATASETATTR_NCACHE;
- } else {
- name->attributes |=
- DNS_NAMEATTR_CACHE;
- rdataset->attributes |=
- DNS_RDATASETATTR_CACHE;
- }
- if (aa)
- rdataset->trust =
- dns_trust_authauthority;
- else
- rdataset->trust =
- dns_trust_additional;
- /*
- * No additional data needs to be
- * marked.
- */
- } else if (type == dns_rdatatype_ds) {
- /*
- * DS or SIG DS.
- *
- * These should only be here if
- * this is a referral, and there
- * should only be one DS.
- */
- if (ns_name == NULL)
- return (DNS_R_FORMERR);
- if (rdataset->type ==
- dns_rdatatype_ds) {
- if (ds_name != NULL &&
- name != ds_name)
- return (DNS_R_FORMERR);
- ds_name = name;
- }
- name->attributes |=
- DNS_NAMEATTR_CACHE;
- rdataset->attributes |=
- DNS_RDATASETATTR_CACHE;
- if (aa)
- rdataset->trust =
- dns_trust_authauthority;
- else
- rdataset->trust =
- dns_trust_additional;
- }
- }
- }
- result = dns_message_nextname(message, section);
- if (result == ISC_R_NOMORE)
- break;
- else if (result != ISC_R_SUCCESS)
- return (result);
- }
-
- /*
- * Trigger lookups for DNS nameservers.
- */
- if (negative_response && message->rcode == dns_rcode_noerror &&
- fctx->type == dns_rdatatype_ds && soa_name != NULL &&
- dns_name_equal(soa_name, qname) &&
- !dns_name_equal(qname, dns_rootname))
- return (DNS_R_CHASEDSSERVERS);
-
- /*
- * Did we find anything?
- */
- if (!negative_response && ns_name == NULL) {
- /*
- * Nope.
- */
- if (oqname != NULL) {
- /*
- * We've already got a partial CNAME/DNAME chain,
- * and haven't found else anything useful here, but
- * no error has occurred since we have an answer.
- */
- return (ISC_R_SUCCESS);
- } else {
- /*
- * The responder is insane.
- */
- return (DNS_R_FORMERR);
- }
- }
-
- /*
- * If we found both NS and SOA, they should be the same name.
- */
- if (ns_name != NULL && soa_name != NULL && ns_name != soa_name)
- return (DNS_R_FORMERR);
-
- /*
- * Do we have a referral? (We only want to follow a referral if
- * we're not following a chain.)
- */
- if (!negative_response && ns_name != NULL && oqname == NULL) {
- /*
- * We already know ns_name is a subdomain of fctx->domain.
- * If ns_name is equal to fctx->domain, we're not making
- * progress. We return DNS_R_FORMERR so that we'll keep
- * trying other servers.
- */
- if (dns_name_equal(ns_name, &fctx->domain))
- return (DNS_R_FORMERR);
-
- /*
- * If the referral name is not a parent of the query
- * name, consider the responder insane.
- */
- if (! dns_name_issubdomain(&fctx->name, ns_name)) {
- FCTXTRACE("referral to non-parent");
- return (DNS_R_FORMERR);
- }
-
- /*
- * Mark any additional data related to this rdataset.
- * It's important that we do this before we change the
- * query domain.
- */
- INSIST(ns_rdataset != NULL);
- fctx->attributes |= FCTX_ATTR_GLUING;
- (void)dns_rdataset_additionaldata(ns_rdataset, check_related,
- fctx);
- fctx->attributes &= ~FCTX_ATTR_GLUING;
- /*
- * NS rdatasets with 0 TTL cause problems.
- * dns_view_findzonecut() will not find them when we
- * try to follow the referral, and we'll SERVFAIL
- * because the best nameservers are now above QDOMAIN.
- * We force the TTL to 1 second to prevent this.
- */
- if (ns_rdataset->ttl == 0)
- ns_rdataset->ttl = 1;
- /*
- * Set the current query domain to the referral name.
- *
- * XXXRTH We should check if we're in forward-only mode, and
- * if so we should bail out.
- */
- INSIST(dns_name_countlabels(&fctx->domain) > 0);
- dns_name_free(&fctx->domain, fctx->res->mctx);
- if (dns_rdataset_isassociated(&fctx->nameservers))
- dns_rdataset_disassociate(&fctx->nameservers);
- dns_name_init(&fctx->domain, NULL);
- result = dns_name_dup(ns_name, fctx->res->mctx, &fctx->domain);
- if (result != ISC_R_SUCCESS)
- return (result);
- fctx->attributes |= FCTX_ATTR_WANTCACHE;
- return (DNS_R_DELEGATION);
- }
-
- /*
- * Since we're not doing a referral, we don't want to cache any
- * NS RRs we may have found.
- */
- if (ns_name != NULL)
- ns_name->attributes &= ~DNS_NAMEATTR_CACHE;
-
- if (negative_response && oqname == NULL)
- fctx->attributes |= FCTX_ATTR_WANTNCACHE;
-
- return (ISC_R_SUCCESS);
-}
-
-static isc_result_t
-answer_response(fetchctx_t *fctx) {
- isc_result_t result;
- dns_message_t *message;
- dns_name_t *name, *qname, tname;
- dns_rdataset_t *rdataset;
- isc_boolean_t done, external, chaining, aa, found, want_chaining;
- isc_boolean_t have_answer, found_cname, found_type, wanted_chaining;
- unsigned int aflag;
- dns_rdatatype_t type;
- dns_fixedname_t dname, fqname;
-
- FCTXTRACE("answer_response");
-
- message = fctx->rmessage;
-
- /*
- * Examine the answer section, marking those rdatasets which are
- * part of the answer and should be cached.
- */
-
- done = ISC_FALSE;
- found_cname = ISC_FALSE;
- found_type = ISC_FALSE;
- chaining = ISC_FALSE;
- have_answer = ISC_FALSE;
- want_chaining = ISC_FALSE;
- if ((message->flags & DNS_MESSAGEFLAG_AA) != 0)
- aa = ISC_TRUE;
- else
- aa = ISC_FALSE;
- qname = &fctx->name;
- type = fctx->type;
- result = dns_message_firstname(message, DNS_SECTION_ANSWER);
- while (!done && result == ISC_R_SUCCESS) {
- name = NULL;
- dns_message_currentname(message, DNS_SECTION_ANSWER, &name);
- external = ISC_TF(!dns_name_issubdomain(name, &fctx->domain));
- if (dns_name_equal(name, qname)) {
- wanted_chaining = ISC_FALSE;
- for (rdataset = ISC_LIST_HEAD(name->list);
- rdataset != NULL;
- rdataset = ISC_LIST_NEXT(rdataset, link)) {
- found = ISC_FALSE;
- want_chaining = ISC_FALSE;
- aflag = 0;
- if (rdataset->type == type && !found_cname) {
- /*
- * We've found an ordinary answer.
- */
- found = ISC_TRUE;
- found_type = ISC_TRUE;
- done = ISC_TRUE;
- aflag = DNS_RDATASETATTR_ANSWER;
- } else if (type == dns_rdatatype_any) {
- /*
- * We've found an answer matching
- * an ANY query. There may be
- * more.
- */
- found = ISC_TRUE;
- aflag = DNS_RDATASETATTR_ANSWER;
- } else if (rdataset->type == dns_rdatatype_rrsig
- && rdataset->covers == type
- && !found_cname) {
- /*
- * We've found a signature that
- * covers the type we're looking for.
- */
- found = ISC_TRUE;
- found_type = ISC_TRUE;
- aflag = DNS_RDATASETATTR_ANSWERSIG;
- } else if (rdataset->type ==
- dns_rdatatype_cname
- && !found_type) {
- /*
- * We're looking for something else,
- * but we found a CNAME.
- *
- * Getting a CNAME response for some
- * query types is an error.
- */
- if (type == dns_rdatatype_rrsig ||
- type == dns_rdatatype_dnskey ||
- type == dns_rdatatype_nsec)
- return (DNS_R_FORMERR);
- found = ISC_TRUE;
- found_cname = ISC_TRUE;
- want_chaining = ISC_TRUE;
- aflag = DNS_RDATASETATTR_ANSWER;
- result = cname_target(rdataset,
- &tname);
- if (result != ISC_R_SUCCESS)
- return (result);
- } else if (rdataset->type == dns_rdatatype_rrsig
- && rdataset->covers ==
- dns_rdatatype_cname
- && !found_type) {
- /*
- * We're looking for something else,
- * but we found a SIG CNAME.
- */
- found = ISC_TRUE;
- found_cname = ISC_TRUE;
- aflag = DNS_RDATASETATTR_ANSWERSIG;
- }
-
- if (found) {
- /*
- * We've found an answer to our
- * question.
- */
- name->attributes |=
- DNS_NAMEATTR_CACHE;
- rdataset->attributes |=
- DNS_RDATASETATTR_CACHE;
- rdataset->trust = dns_trust_answer;
- if (!chaining) {
- /*
- * This data is "the" answer
- * to our question only if
- * we're not chaining (i.e.
- * if we haven't followed
- * a CNAME or DNAME).
- */
- INSIST(!external);
- if (aflag ==
- DNS_RDATASETATTR_ANSWER)
- have_answer = ISC_TRUE;
- name->attributes |=
- DNS_NAMEATTR_ANSWER;
- rdataset->attributes |= aflag;
- if (aa)
- rdataset->trust =
- dns_trust_authanswer;
- } else if (external) {
- /*
- * This data is outside of
- * our query domain, and
- * may only be cached if it
- * comes from a secure zone
- * and validates.
- */
- rdataset->attributes |=
- DNS_RDATASETATTR_EXTERNAL;
- }
-
- /*
- * Mark any additional data related
- * to this rdataset.
- */
- (void)dns_rdataset_additionaldata(
- rdataset,
- check_related,
- fctx);
-
- /*
- * CNAME chaining.
- */
- if (want_chaining) {
- wanted_chaining = ISC_TRUE;
- name->attributes |=
- DNS_NAMEATTR_CHAINING;
- rdataset->attributes |=
- DNS_RDATASETATTR_CHAINING;
- qname = &tname;
- }
- }
- /*
- * We could add an "else" clause here and
- * log that we're ignoring this rdataset.
- */
- }
- /*
- * If wanted_chaining is true, we've done
- * some chaining as the result of processing
- * this node, and thus we need to set
- * chaining to true.
- *
- * We don't set chaining inside of the
- * rdataset loop because doing that would
- * cause us to ignore the signatures of
- * CNAMEs.
- */
- if (wanted_chaining)
- chaining = ISC_TRUE;
- } else {
- /*
- * Look for a DNAME (or its SIG). Anything else is
- * ignored.
- */
- wanted_chaining = ISC_FALSE;
- for (rdataset = ISC_LIST_HEAD(name->list);
- rdataset != NULL;
- rdataset = ISC_LIST_NEXT(rdataset, link)) {
- isc_boolean_t found_dname = ISC_FALSE;
- found = ISC_FALSE;
- aflag = 0;
- if (rdataset->type == dns_rdatatype_dname) {
- /*
- * We're looking for something else,
- * but we found a DNAME.
- *
- * If we're not chaining, then the
- * DNAME should not be external.
- */
- if (!chaining && external)
- return (DNS_R_FORMERR);
- found = ISC_TRUE;
- want_chaining = ISC_TRUE;
- aflag = DNS_RDATASETATTR_ANSWER;
- result = dname_target(rdataset,
- qname, name,
- &dname);
- if (result == ISC_R_NOSPACE) {
- /*
- * We can't construct the
- * DNAME target. Do not
- * try to continue.
- */
- want_chaining = ISC_FALSE;
- } else if (result != ISC_R_SUCCESS)
- return (result);
- else
- found_dname = ISC_TRUE;
- } else if (rdataset->type == dns_rdatatype_rrsig
- && rdataset->covers ==
- dns_rdatatype_dname) {
- /*
- * We've found a signature that
- * covers the DNAME.
- */
- found = ISC_TRUE;
- aflag = DNS_RDATASETATTR_ANSWERSIG;
- }
-
- if (found) {
- /*
- * We've found an answer to our
- * question.
- */
- name->attributes |=
- DNS_NAMEATTR_CACHE;
- rdataset->attributes |=
- DNS_RDATASETATTR_CACHE;
- rdataset->trust = dns_trust_answer;
- if (!chaining) {
- /*
- * This data is "the" answer
- * to our question only if
- * we're not chaining.
- */
- INSIST(!external);
- if (aflag ==
- DNS_RDATASETATTR_ANSWER)
- have_answer = ISC_TRUE;
- name->attributes |=
- DNS_NAMEATTR_ANSWER;
- rdataset->attributes |= aflag;
- if (aa)
- rdataset->trust =
- dns_trust_authanswer;
- } else if (external) {
- rdataset->attributes |=
- DNS_RDATASETATTR_EXTERNAL;
- }
-
- /*
- * DNAME chaining.
- */
- if (found_dname) {
- /*
- * Copy the the dname into the
- * qname fixed name.
- *
- * Although we check for
- * failure of the copy
- * operation, in practice it
- * should never fail since
- * we already know that the
- * result fits in a fixedname.
- */
- dns_fixedname_init(&fqname);
- result = dns_name_copy(
- dns_fixedname_name(&dname),
- dns_fixedname_name(&fqname),
- NULL);
- if (result != ISC_R_SUCCESS)
- return (result);
- wanted_chaining = ISC_TRUE;
- name->attributes |=
- DNS_NAMEATTR_CHAINING;
- rdataset->attributes |=
- DNS_RDATASETATTR_CHAINING;
- qname = dns_fixedname_name(
- &fqname);
- }
- }
- }
- if (wanted_chaining)
- chaining = ISC_TRUE;
- }
- result = dns_message_nextname(message, DNS_SECTION_ANSWER);
- }
- if (result == ISC_R_NOMORE)
- result = ISC_R_SUCCESS;
- if (result != ISC_R_SUCCESS)
- return (result);
-
- /*
- * We should have found an answer.
- */
- if (!have_answer)
- return (DNS_R_FORMERR);
-
- /*
- * This response is now potentially cacheable.
- */
- fctx->attributes |= FCTX_ATTR_WANTCACHE;
-
- /*
- * Did chaining end before we got the final answer?
- */
- if (chaining) {
- /*
- * Yes. This may be a negative reply, so hand off
- * authority section processing to the noanswer code.
- * If it isn't a noanswer response, no harm will be
- * done.
- */
- return (noanswer_response(fctx, qname, ISC_FALSE));
- }
-
- /*
- * We didn't end with an incomplete chain, so the rcode should be
- * "no error".
- */
- if (message->rcode != dns_rcode_noerror)
- return (DNS_R_FORMERR);
-
- /*
- * Examine the authority section (if there is one).
- *
- * We expect there to be only one owner name for all the rdatasets
- * in this section, and we expect that it is not external.
- */
- done = ISC_FALSE;
- result = dns_message_firstname(message, DNS_SECTION_AUTHORITY);
- while (!done && result == ISC_R_SUCCESS) {
- name = NULL;
- dns_message_currentname(message, DNS_SECTION_AUTHORITY, &name);
- external = ISC_TF(!dns_name_issubdomain(name, &fctx->domain));
- if (!external) {
- /*
- * We expect to find NS or SIG NS rdatasets, and
- * nothing else.
- */
- for (rdataset = ISC_LIST_HEAD(name->list);
- rdataset != NULL;
- rdataset = ISC_LIST_NEXT(rdataset, link)) {
- if (rdataset->type == dns_rdatatype_ns ||
- (rdataset->type == dns_rdatatype_rrsig &&
- rdataset->covers == dns_rdatatype_ns)) {
- name->attributes |=
- DNS_NAMEATTR_CACHE;
- rdataset->attributes |=
- DNS_RDATASETATTR_CACHE;
- if (aa && !chaining)
- rdataset->trust =
- dns_trust_authauthority;
- else
- rdataset->trust =
- dns_trust_additional;
-
- /*
- * Mark any additional data related
- * to this rdataset.
- */
- (void)dns_rdataset_additionaldata(
- rdataset,
- check_related,
- fctx);
- done = ISC_TRUE;
- }
- }
- }
- result = dns_message_nextname(message, DNS_SECTION_AUTHORITY);
- }
- if (result == ISC_R_NOMORE)
- result = ISC_R_SUCCESS;
-
- return (result);
-}
-
-static void
-resume_dslookup(isc_task_t *task, isc_event_t *event) {
- dns_fetchevent_t *fevent;
- dns_resolver_t *res;
- fetchctx_t *fctx;
- isc_result_t result;
- isc_boolean_t bucket_empty = ISC_FALSE;
- isc_boolean_t locked = ISC_FALSE;
- unsigned int bucketnum;
- dns_rdataset_t nameservers;
- dns_fixedname_t fixed;
- dns_name_t *domain;
-
- REQUIRE(event->ev_type == DNS_EVENT_FETCHDONE);
- fevent = (dns_fetchevent_t *)event;
- fctx = event->ev_arg;
- REQUIRE(VALID_FCTX(fctx));
- res = fctx->res;
-
- UNUSED(task);
- FCTXTRACE("resume_dslookup");
-
- if (fevent->node != NULL)
- dns_db_detachnode(fevent->db, &fevent->node);
- if (fevent->db != NULL)
- dns_db_detach(&fevent->db);
-
- dns_rdataset_init(&nameservers);
-
- bucketnum = fctx->bucketnum;
- if (fevent->result == ISC_R_CANCELED) {
- dns_resolver_destroyfetch(&fctx->nsfetch);
- fctx_done(fctx, ISC_R_CANCELED);
- } else if (fevent->result == ISC_R_SUCCESS) {
-
- FCTXTRACE("resuming DS lookup");
-
- dns_resolver_destroyfetch(&fctx->nsfetch);
- if (dns_rdataset_isassociated(&fctx->nameservers))
- dns_rdataset_disassociate(&fctx->nameservers);
- dns_rdataset_clone(fevent->rdataset, &fctx->nameservers);
- dns_name_free(&fctx->domain, fctx->res->mctx);
- dns_name_init(&fctx->domain, NULL);
- result = dns_name_dup(&fctx->nsname, fctx->res->mctx,
- &fctx->domain);
- if (result != ISC_R_SUCCESS) {
- fctx_done(fctx, DNS_R_SERVFAIL);
- goto cleanup;
- }
- /*
- * Try again.
- */
- fctx_try(fctx);
- } else {
- unsigned int n;
- dns_rdataset_t *nsrdataset = NULL;
-
- /*
- * Retrieve state from fctx->nsfetch before we destroy it.
- */
- dns_fixedname_init(&fixed);
- domain = dns_fixedname_name(&fixed);
- dns_name_copy(&fctx->nsfetch->private->domain, domain, NULL);
- if (dns_name_equal(&fctx->nsname, domain)) {
- fctx_done(fctx, DNS_R_SERVFAIL);
- dns_resolver_destroyfetch(&fctx->nsfetch);
- goto cleanup;
- }
- if (dns_rdataset_isassociated(
- &fctx->nsfetch->private->nameservers)) {
- dns_rdataset_clone(
- &fctx->nsfetch->private->nameservers,
- &nameservers);
- nsrdataset = &nameservers;
- } else
- domain = NULL;
- dns_resolver_destroyfetch(&fctx->nsfetch);
- n = dns_name_countlabels(&fctx->nsname);
- dns_name_getlabelsequence(&fctx->nsname, 1, n - 1,
- &fctx->nsname);
-
- if (dns_rdataset_isassociated(fevent->rdataset))
- dns_rdataset_disassociate(fevent->rdataset);
- FCTXTRACE("continuing to look for parent's NS records");
- result = dns_resolver_createfetch(fctx->res, &fctx->nsname,
- dns_rdatatype_ns, domain,
- nsrdataset, NULL, 0, task,
- resume_dslookup, fctx,
- &fctx->nsrrset, NULL,
- &fctx->nsfetch);
- if (result != ISC_R_SUCCESS)
- fctx_done(fctx, result);
- else {
- LOCK(&res->buckets[bucketnum].lock);
- locked = ISC_TRUE;
- fctx->references++;
- }
- }
-
- cleanup:
- if (dns_rdataset_isassociated(&nameservers))
- dns_rdataset_disassociate(&nameservers);
- if (dns_rdataset_isassociated(fevent->rdataset))
- dns_rdataset_disassociate(fevent->rdataset);
- INSIST(fevent->sigrdataset == NULL);
- isc_event_free(&event);
- if (!locked)
- LOCK(&res->buckets[bucketnum].lock);
- fctx->references--;
- if (fctx->references == 0)
- bucket_empty = fctx_destroy(fctx);
- UNLOCK(&res->buckets[bucketnum].lock);
- if (bucket_empty)
- empty_bucket(res);
-}
-
-static inline void
-checknamessection(dns_message_t *message, dns_section_t section) {
- isc_result_t result;
- dns_name_t *name;
- dns_rdata_t rdata = DNS_RDATA_INIT;
- dns_rdataset_t *rdataset;
-
- for (result = dns_message_firstname(message, section);
- result == ISC_R_SUCCESS;
- result = dns_message_nextname(message, section))
- {
- name = NULL;
- dns_message_currentname(message, section, &name);
- for (rdataset = ISC_LIST_HEAD(name->list);
- rdataset != NULL;
- rdataset = ISC_LIST_NEXT(rdataset, link)) {
- for (result = dns_rdataset_first(rdataset);
- result == ISC_R_SUCCESS;
- result = dns_rdataset_next(rdataset)) {
- dns_rdataset_current(rdataset, &rdata);
- if (!dns_rdata_checkowner(name, rdata.rdclass,
- rdata.type,
- ISC_FALSE) ||
- !dns_rdata_checknames(&rdata, name, NULL))
- {
- rdataset->attributes |=
- DNS_RDATASETATTR_CHECKNAMES;
- }
- dns_rdata_reset(&rdata);
- }
- }
- }
-}
-
-static void
-checknames(dns_message_t *message) {
-
- checknamessection(message, DNS_SECTION_ANSWER);
- checknamessection(message, DNS_SECTION_AUTHORITY);
- checknamessection(message, DNS_SECTION_ADDITIONAL);
-}
-
-static void
-log_packet(dns_message_t *message, int level, isc_mem_t *mctx) {
- isc_buffer_t buffer;
- char *buf = NULL;
- int len = 1024;
- isc_result_t result;
-
- if (! isc_log_wouldlog(dns_lctx, level))
- return;
-
- /*
- * Note that these are multiline debug messages. We want a newline
- * to appear in the log after each message.
- */
-
- do {
- buf = isc_mem_get(mctx, len);
- if (buf == NULL)
- break;
- isc_buffer_init(&buffer, buf, len);
- result = dns_message_totext(message, &dns_master_style_debug,
- 0, &buffer);
- if (result == ISC_R_NOSPACE) {
- isc_mem_put(mctx, buf, len);
- len += 1024;
- } else if (result == ISC_R_SUCCESS)
- isc_log_write(dns_lctx, DNS_LOGCATEGORY_RESOLVER,
- DNS_LOGMODULE_RESOLVER, level,
- "received packet:\n%.*s",
- (int)isc_buffer_usedlength(&buffer),
- buf);
- } while (result == ISC_R_NOSPACE);
-
- if (buf != NULL)
- isc_mem_put(mctx, buf, len);
-}
-
-static void
-resquery_response(isc_task_t *task, isc_event_t *event) {
- isc_result_t result = ISC_R_SUCCESS;
- resquery_t *query = event->ev_arg;
- dns_dispatchevent_t *devent = (dns_dispatchevent_t *)event;
- isc_boolean_t keep_trying, get_nameservers, resend;
- isc_boolean_t truncated;
- dns_message_t *message;
- fetchctx_t *fctx;
- dns_name_t *fname;
- dns_fixedname_t foundname;
- isc_stdtime_t now;
- isc_time_t tnow, *finish;
- dns_adbaddrinfo_t *addrinfo;
- unsigned int options;
- unsigned int findoptions;
- isc_result_t broken_server;
-
- REQUIRE(VALID_QUERY(query));
- fctx = query->fctx;
- options = query->options;
- REQUIRE(VALID_FCTX(fctx));
- REQUIRE(event->ev_type == DNS_EVENT_DISPATCH);
-
- QTRACE("response");
-
- (void)isc_timer_touch(fctx->timer);
-
- keep_trying = ISC_FALSE;
- broken_server = ISC_R_SUCCESS;
- get_nameservers = ISC_FALSE;
- resend = ISC_FALSE;
- truncated = ISC_FALSE;
- finish = NULL;
-
- if (fctx->res->exiting) {
- result = ISC_R_SHUTTINGDOWN;
- goto done;
- }
-
- fctx->timeouts = 0;
-
- /*
- * XXXRTH We should really get the current time just once. We
- * need a routine to convert from an isc_time_t to an
- * isc_stdtime_t.
- */
- TIME_NOW(&tnow);
- finish = &tnow;
- isc_stdtime_get(&now);
-
- /*
- * Did the dispatcher have a problem?
- */
- if (devent->result != ISC_R_SUCCESS) {
- if (devent->result == ISC_R_EOF &&
- (query->options & DNS_FETCHOPT_NOEDNS0) == 0) {
- /*
- * The problem might be that they
- * don't understand EDNS0. Turn it
- * off and try again.
- */
- options |= DNS_FETCHOPT_NOEDNS0;
- resend = ISC_TRUE;
- /*
- * Remember that they don't like EDNS0.
- */
- dns_adb_changeflags(fctx->adb,
- query->addrinfo,
- DNS_FETCHOPT_NOEDNS0,
- DNS_FETCHOPT_NOEDNS0);
- } else {
- /*
- * There's no hope for this query.
- */
- keep_trying = ISC_TRUE;
- }
- goto done;
- }
-
- message = fctx->rmessage;
-
- if (query->tsig != NULL) {
- result = dns_message_setquerytsig(message, query->tsig);
- if (result != ISC_R_SUCCESS)
- goto done;
- }
-
- if (query->tsigkey) {
- result = dns_message_settsigkey(message, query->tsigkey);
- if (result != ISC_R_SUCCESS)
- goto done;
- }
-
- result = dns_message_parse(message, &devent->buffer, 0);
- if (result != ISC_R_SUCCESS) {
- switch (result) {
- case ISC_R_UNEXPECTEDEND:
- if (!message->question_ok ||
- (message->flags & DNS_MESSAGEFLAG_TC) == 0 ||
- (options & DNS_FETCHOPT_TCP) != 0) {
- /*
- * Either the message ended prematurely,
- * and/or wasn't marked as being truncated,
- * and/or this is a response to a query we
- * sent over TCP. In all of these cases,
- * something is wrong with the remote
- * server and we don't want to retry using
- * TCP.
- */
- if ((query->options & DNS_FETCHOPT_NOEDNS0)
- == 0) {
- /*
- * The problem might be that they
- * don't understand EDNS0. Turn it
- * off and try again.
- */
- options |= DNS_FETCHOPT_NOEDNS0;
- resend = ISC_TRUE;
- /*
- * Remember that they don't like EDNS0.
- */
- dns_adb_changeflags(
- fctx->adb,
- query->addrinfo,
- DNS_FETCHOPT_NOEDNS0,
- DNS_FETCHOPT_NOEDNS0);
- } else {
- broken_server = result;
- keep_trying = ISC_TRUE;
- }
- goto done;
- }
- /*
- * We defer retrying via TCP for a bit so we can
- * check out this message further.
- */
- truncated = ISC_TRUE;
- break;
- case DNS_R_FORMERR:
- if ((query->options & DNS_FETCHOPT_NOEDNS0) == 0) {
- /*
- * The problem might be that they
- * don't understand EDNS0. Turn it
- * off and try again.
- */
- options |= DNS_FETCHOPT_NOEDNS0;
- resend = ISC_TRUE;
- /*
- * Remember that they don't like EDNS0.
- */
- dns_adb_changeflags(fctx->adb,
- query->addrinfo,
- DNS_FETCHOPT_NOEDNS0,
- DNS_FETCHOPT_NOEDNS0);
- } else {
- broken_server = DNS_R_UNEXPECTEDRCODE;
- keep_trying = ISC_TRUE;
- }
- goto done;
- default:
- /*
- * Something bad has happened.
- */
- goto done;
- }
- }
-
- /*
- * Log the incoming packet.
- */
- log_packet(message, ISC_LOG_DEBUG(10), fctx->res->mctx);
-
- /*
- * If the message is signed, check the signature. If not, this
- * returns success anyway.
- */
- result = dns_message_checksig(message, fctx->res->view);
- if (result != ISC_R_SUCCESS)
- goto done;
-
- /*
- * The dispatcher should ensure we only get responses with QR set.
- */
- INSIST((message->flags & DNS_MESSAGEFLAG_QR) != 0);
- /*
- * INSIST() that the message comes from the place we sent it to,
- * since the dispatch code should ensure this.
- *
- * INSIST() that the message id is correct (this should also be
- * ensured by the dispatch code).
- */
-
-
- /*
- * Deal with truncated responses by retrying using TCP.
- */
- if ((message->flags & DNS_MESSAGEFLAG_TC) != 0)
- truncated = ISC_TRUE;
-
- if (truncated) {
- if ((options & DNS_FETCHOPT_TCP) != 0) {
- broken_server = DNS_R_TRUNCATEDTCP;
- keep_trying = ISC_TRUE;
- } else {
- options |= DNS_FETCHOPT_TCP;
- resend = ISC_TRUE;
- }
- goto done;
- }
-
- /*
- * Is it a query response?
- */
- if (message->opcode != dns_opcode_query) {
- /* XXXRTH Log */
- broken_server = DNS_R_UNEXPECTEDOPCODE;
- keep_trying = ISC_TRUE;
- goto done;
- }
-
- /*
- * Is the remote server broken, or does it dislike us?
- */
- if (message->rcode != dns_rcode_noerror &&
- message->rcode != dns_rcode_nxdomain) {
- if ((message->rcode == dns_rcode_formerr ||
- message->rcode == dns_rcode_notimp ||
- message->rcode == dns_rcode_servfail) &&
- (query->options & DNS_FETCHOPT_NOEDNS0) == 0) {
- /*
- * It's very likely they don't like EDNS0.
- *
- * XXXRTH We should check if the question
- * we're asking requires EDNS0, and
- * if so, we should bail out.
- */
- options |= DNS_FETCHOPT_NOEDNS0;
- resend = ISC_TRUE;
- /*
- * Remember that they don't like EDNS0.
- */
- if (message->rcode != dns_rcode_servfail)
- dns_adb_changeflags(fctx->adb, query->addrinfo,
- DNS_FETCHOPT_NOEDNS0,
- DNS_FETCHOPT_NOEDNS0);
- } else if (message->rcode == dns_rcode_formerr) {
- if (ISFORWARDER(query->addrinfo)) {
- /*
- * This forwarder doesn't understand us,
- * but other forwarders might. Keep trying.
- */
- broken_server = DNS_R_REMOTEFORMERR;
- keep_trying = ISC_TRUE;
- } else {
- /*
- * The server doesn't understand us. Since
- * all servers for a zone need similar
- * capabilities, we assume that we will get
- * FORMERR from all servers, and thus we
- * cannot make any more progress with this
- * fetch.
- */
- result = DNS_R_FORMERR;
- }
- } else if (message->rcode == dns_rcode_yxdomain) {
- /*
- * DNAME mapping failed because the new name
- * was too long. There's no chance of success
- * for this fetch.
- */
- result = DNS_R_YXDOMAIN;
- } else {
- /*
- * XXXRTH log.
- */
- broken_server = DNS_R_UNEXPECTEDRCODE;
- INSIST(broken_server != ISC_R_SUCCESS);
- keep_trying = ISC_TRUE;
- }
- goto done;
- }
-
- /*
- * Is the question the same as the one we asked?
- */
- result = same_question(fctx);
- if (result != ISC_R_SUCCESS) {
- /* XXXRTH Log */
- if (result == DNS_R_FORMERR)
- keep_trying = ISC_TRUE;
- goto done;
- }
-
- /*
- * Is the server lame?
- */
- if (fctx->res->lame_ttl != 0 && !ISFORWARDER(query->addrinfo) &&
- is_lame(fctx)) {
- log_lame(fctx, query->addrinfo);
- result = dns_adb_marklame(fctx->adb, query->addrinfo,
- &fctx->domain,
- now + fctx->res->lame_ttl);
- if (result != ISC_R_SUCCESS)
- isc_log_write(dns_lctx, DNS_LOGCATEGORY_RESOLVER,
- DNS_LOGMODULE_RESOLVER, ISC_LOG_ERROR,
- "could not mark server as lame: %s",
- isc_result_totext(result));
- broken_server = DNS_R_LAME;
- keep_trying = ISC_TRUE;
- goto done;
- }
-
- /*
- * Enforce delegations only zones like NET and COM.
- */
- if (!ISFORWARDER(query->addrinfo) &&
- dns_view_isdelegationonly(fctx->res->view, &fctx->domain) &&
- !dns_name_equal(&fctx->domain, &fctx->name) &&
- fix_mustbedelegationornxdomain(message, fctx)) {
- char namebuf[DNS_NAME_FORMATSIZE];
- char domainbuf[DNS_NAME_FORMATSIZE];
- char addrbuf[ISC_SOCKADDR_FORMATSIZE];
- char classbuf[64];
- char typebuf[64];
-
- dns_name_format(&fctx->name, namebuf, sizeof(namebuf));
- dns_name_format(&fctx->domain, domainbuf, sizeof(domainbuf));
- dns_rdatatype_format(fctx->type, typebuf, sizeof(typebuf));
- dns_rdataclass_format(fctx->res->rdclass, classbuf,
- sizeof(classbuf));
- isc_sockaddr_format(&query->addrinfo->sockaddr, addrbuf,
- sizeof(addrbuf));
-
- isc_log_write(dns_lctx, DNS_LOGCATEGORY_DELEGATION_ONLY,
- DNS_LOGMODULE_RESOLVER, ISC_LOG_NOTICE,
- "enforced delegation-only for '%s' (%s/%s/%s) "
- "from %s",
- domainbuf, namebuf, typebuf, classbuf, addrbuf);
- }
-
- if ((fctx->res->options & DNS_RESOLVER_CHECKNAMES) != 0)
- checknames(message);
-
- /*
- * Clear cache bits.
- */
- fctx->attributes &= ~(FCTX_ATTR_WANTNCACHE | FCTX_ATTR_WANTCACHE);
-
- /*
- * Did we get any answers?
- */
- if (message->counts[DNS_SECTION_ANSWER] > 0 &&
- (message->rcode == dns_rcode_noerror ||
- message->rcode == dns_rcode_nxdomain)) {
- /*
- * We've got answers. However, if we sent
- * a BIND 8 server an NS query, it may have
- * incorrectly responded with a non-authoritative
- * answer instead of a referral. Since this
- * answer lacks the SIGs necessary to do DNSSEC
- * validation, we must invoke the following special
- * kludge to treat it as a referral.
- */
- if (fctx->type == dns_rdatatype_ns &&
- (message->flags & DNS_MESSAGEFLAG_AA) == 0 &&
- !ISFORWARDER(query->addrinfo))
- {
- result = noanswer_response(fctx, NULL, ISC_TRUE);
- if (result != DNS_R_DELEGATION) {
- /*
- * The answer section must have contained
- * something other than the NS records
- * we asked for. Since AA is not set
- * and the server is not a forwarder,
- * it is technically lame and it's easier
- * to treat it as such than to figure out
- * some more elaborate course of action.
- */
- broken_server = DNS_R_LAME;
- keep_trying = ISC_TRUE;
- goto done;
- }
- goto force_referral;
- }
- result = answer_response(fctx);
- if (result != ISC_R_SUCCESS) {
- if (result == DNS_R_FORMERR)
- keep_trying = ISC_TRUE;
- goto done;
- }
- } else if (message->counts[DNS_SECTION_AUTHORITY] > 0 ||
- message->rcode == dns_rcode_noerror ||
- message->rcode == dns_rcode_nxdomain) {
- /*
- * NXDOMAIN, NXRDATASET, or referral.
- */
- result = noanswer_response(fctx, NULL, ISC_FALSE);
- if (result == DNS_R_CHASEDSSERVERS) {
- } else if (result == DNS_R_DELEGATION) {
- force_referral:
- /*
- * We don't have the answer, but we know a better
- * place to look.
- */
- get_nameservers = ISC_TRUE;
- keep_trying = ISC_TRUE;
- /*
- * We have a new set of name servers, and it
- * has not experienced any restarts yet.
- */
- fctx->restarts = 0;
- result = ISC_R_SUCCESS;
- } else if (result != ISC_R_SUCCESS) {
- /*
- * Something has gone wrong.
- */
- if (result == DNS_R_FORMERR)
- keep_trying = ISC_TRUE;
- goto done;
- }
- } else {
- /*
- * The server is insane.
- */
- /* XXXRTH Log */
- broken_server = DNS_R_UNEXPECTEDRCODE;
- keep_trying = ISC_TRUE;
- goto done;
- }
-
- /*
- * Follow additional section data chains.
- */
- chase_additional(fctx);
-
- /*
- * Cache the cacheable parts of the message. This may also cause
- * work to be queued to the DNSSEC validator.
- */
- if (WANTCACHE(fctx)) {
- result = cache_message(fctx, query->addrinfo, now);
- if (result != ISC_R_SUCCESS)
- goto done;
- }
-
- /*
- * Ncache the negatively cacheable parts of the message. This may
- * also cause work to be queued to the DNSSEC validator.
- */
- if (WANTNCACHE(fctx)) {
- dns_rdatatype_t covers;
- if (message->rcode == dns_rcode_nxdomain)
- covers = dns_rdatatype_any;
- else
- covers = fctx->type;
-
- /*
- * Cache any negative cache entries in the message.
- */
- result = ncache_message(fctx, query->addrinfo, covers, now);
- }
-
- done:
- /*
- * Remember the query's addrinfo, in case we need to mark the
- * server as broken.
- */
- addrinfo = query->addrinfo;
-
- /*
- * Cancel the query.
- *
- * XXXRTH Don't cancel the query if waiting for validation?
- */
- fctx_cancelquery(&query, &devent, finish, ISC_FALSE);
-
- if (keep_trying) {
- if (result == DNS_R_FORMERR)
- broken_server = DNS_R_FORMERR;
- if (broken_server != ISC_R_SUCCESS) {
- /*
- * Add this server to the list of bad servers for
- * this fctx.
- */
- add_bad(fctx, &addrinfo->sockaddr, broken_server);
- }
-
- if (get_nameservers) {
- dns_name_t *name;
- dns_fixedname_init(&foundname);
- fname = dns_fixedname_name(&foundname);
- if (result != ISC_R_SUCCESS) {
- fctx_done(fctx, DNS_R_SERVFAIL);
- return;
- }
- findoptions = 0;
- if (dns_rdatatype_atparent(fctx->type))
- findoptions |= DNS_DBFIND_NOEXACT;
- if ((options & DNS_FETCHOPT_UNSHARED) == 0)
- name = &fctx->name;
- else
- name = &fctx->domain;
- result = dns_view_findzonecut(fctx->res->view,
- name, fname,
- now, findoptions,
- ISC_TRUE,
- &fctx->nameservers,
- NULL);
- if (result != ISC_R_SUCCESS) {
- FCTXTRACE("couldn't find a zonecut");
- fctx_done(fctx, DNS_R_SERVFAIL);
- return;
- }
- if (!dns_name_issubdomain(fname, &fctx->domain)) {
- /*
- * The best nameservers are now above our
- * QDOMAIN.
- */
- FCTXTRACE("nameservers now above QDOMAIN");
- fctx_done(fctx, DNS_R_SERVFAIL);
- return;
- }
- dns_name_free(&fctx->domain, fctx->res->mctx);
- dns_name_init(&fctx->domain, NULL);
- result = dns_name_dup(fname, fctx->res->mctx,
- &fctx->domain);
- if (result != ISC_R_SUCCESS) {
- fctx_done(fctx, DNS_R_SERVFAIL);
- return;
- }
- fctx_cancelqueries(fctx, ISC_TRUE);
- fctx_cleanupfinds(fctx);
- fctx_cleanupaltfinds(fctx);
- fctx_cleanupforwaddrs(fctx);
- fctx_cleanupaltaddrs(fctx);
- }
- /*
- * Try again.
- */
- fctx_try(fctx);
- } else if (resend) {
- /*
- * Resend (probably with changed options).
- */
- FCTXTRACE("resend");
- result = fctx_query(fctx, addrinfo, options);
- if (result != ISC_R_SUCCESS)
- fctx_done(fctx, result);
- } else if (result == ISC_R_SUCCESS && !HAVE_ANSWER(fctx)) {
- /*
- * All has gone well so far, but we are waiting for the
- * DNSSEC validator to validate the answer.
- */
- FCTXTRACE("wait for validator");
- fctx_cancelqueries(fctx, ISC_TRUE);
- /*
- * We must not retransmit while the validator is working;
- * it has references to the current rmessage.
- */
- result = fctx_stopidletimer(fctx);
- if (result != ISC_R_SUCCESS)
- fctx_done(fctx, result);
- } else if (result == DNS_R_CHASEDSSERVERS) {
- unsigned int n;
- add_bad(fctx, &addrinfo->sockaddr, result);
- fctx_cancelqueries(fctx, ISC_TRUE);
- fctx_cleanupfinds(fctx);
- fctx_cleanupforwaddrs(fctx);
-
- n = dns_name_countlabels(&fctx->name);
- dns_name_getlabelsequence(&fctx->name, 1, n - 1, &fctx->nsname);
-
- FCTXTRACE("suspending DS lookup to find parent's NS records");
-
- result = dns_resolver_createfetch(fctx->res, &fctx->nsname,
- dns_rdatatype_ns,
- NULL, NULL, NULL, 0, task,
- resume_dslookup, fctx,
- &fctx->nsrrset, NULL,
- &fctx->nsfetch);
- if (result != ISC_R_SUCCESS)
- fctx_done(fctx, result);
- LOCK(&fctx->res->buckets[fctx->bucketnum].lock);
- fctx->references++;
- UNLOCK(&fctx->res->buckets[fctx->bucketnum].lock);
- result = fctx_stopidletimer(fctx);
- if (result != ISC_R_SUCCESS)
- fctx_done(fctx, result);
- } else {
- /*
- * We're done.
- */
- fctx_done(fctx, result);
- }
-}
-
-
-/***
- *** Resolver Methods
- ***/
-
-static void
-destroy(dns_resolver_t *res) {
- unsigned int i;
- alternate_t *a;
-
- REQUIRE(res->references == 0);
- REQUIRE(!res->priming);
- REQUIRE(res->primefetch == NULL);
-
- RTRACE("destroy");
-
- INSIST(res->nfctx == 0);
-
- DESTROYLOCK(&res->primelock);
- DESTROYLOCK(&res->nlock);
- DESTROYLOCK(&res->lock);
- for (i = 0; i < res->nbuckets; i++) {
- INSIST(ISC_LIST_EMPTY(res->buckets[i].fctxs));
- isc_task_shutdown(res->buckets[i].task);
- isc_task_detach(&res->buckets[i].task);
- DESTROYLOCK(&res->buckets[i].lock);
- }
- isc_mem_put(res->mctx, res->buckets,
- res->nbuckets * sizeof(fctxbucket_t));
- if (res->dispatchv4 != NULL)
- dns_dispatch_detach(&res->dispatchv4);
- if (res->dispatchv6 != NULL)
- dns_dispatch_detach(&res->dispatchv6);
- while ((a = ISC_LIST_HEAD(res->alternates)) != NULL) {
- ISC_LIST_UNLINK(res->alternates, a, link);
- if (!a->isaddress)
- dns_name_free(&a->_u._n.name, res->mctx);
- isc_mem_put(res->mctx, a, sizeof(*a));
- }
- dns_resolver_reset_algorithms(res);
- dns_resolver_resetmustbesecure(res);
-#if USE_ALGLOCK
- isc_rwlock_destroy(&res->alglock);
-#endif
-#if USE_MBSLOCK
- isc_rwlock_destroy(&res->mbslock);
-#endif
- res->magic = 0;
- isc_mem_put(res->mctx, res, sizeof(*res));
-}
-
-static void
-send_shutdown_events(dns_resolver_t *res) {
- isc_event_t *event, *next_event;
- isc_task_t *etask;
-
- /*
- * Caller must be holding the resolver lock.
- */
-
- for (event = ISC_LIST_HEAD(res->whenshutdown);
- event != NULL;
- event = next_event) {
- next_event = ISC_LIST_NEXT(event, ev_link);
- ISC_LIST_UNLINK(res->whenshutdown, event, ev_link);
- etask = event->ev_sender;
- event->ev_sender = res;
- isc_task_sendanddetach(&etask, &event);
- }
-}
-
-static void
-empty_bucket(dns_resolver_t *res) {
- RTRACE("empty_bucket");
-
- LOCK(&res->lock);
-
- INSIST(res->activebuckets > 0);
- res->activebuckets--;
- if (res->activebuckets == 0)
- send_shutdown_events(res);
-
- UNLOCK(&res->lock);
-}
-
-isc_result_t
-dns_resolver_create(dns_view_t *view,
- isc_taskmgr_t *taskmgr, unsigned int ntasks,
- isc_socketmgr_t *socketmgr,
- isc_timermgr_t *timermgr,
- unsigned int options,
- dns_dispatchmgr_t *dispatchmgr,
- dns_dispatch_t *dispatchv4,
- dns_dispatch_t *dispatchv6,
- dns_resolver_t **resp)
-{
- dns_resolver_t *res;
- isc_result_t result = ISC_R_SUCCESS;
- unsigned int i, buckets_created = 0;
- char name[16];
-
- /*
- * Create a resolver.
- */
-
- REQUIRE(DNS_VIEW_VALID(view));
- REQUIRE(ntasks > 0);
- REQUIRE(resp != NULL && *resp == NULL);
- REQUIRE(dispatchmgr != NULL);
- REQUIRE(dispatchv4 != NULL || dispatchv6 != NULL);
-
- res = isc_mem_get(view->mctx, sizeof(*res));
- if (res == NULL)
- return (ISC_R_NOMEMORY);
- RTRACE("create");
- res->mctx = view->mctx;
- res->rdclass = view->rdclass;
- res->socketmgr = socketmgr;
- res->timermgr = timermgr;
- res->taskmgr = taskmgr;
- res->dispatchmgr = dispatchmgr;
- res->view = view;
- res->options = options;
- res->lame_ttl = 0;
- ISC_LIST_INIT(res->alternates);
- res->udpsize = RECV_BUFFER_SIZE;
- res->algorithms = NULL;
- res->mustbesecure = NULL;
-
- res->nbuckets = ntasks;
- res->activebuckets = ntasks;
- res->buckets = isc_mem_get(view->mctx,
- ntasks * sizeof(fctxbucket_t));
- if (res->buckets == NULL) {
- result = ISC_R_NOMEMORY;
- goto cleanup_res;
- }
- for (i = 0; i < ntasks; i++) {
- result = isc_mutex_init(&res->buckets[i].lock);
- if (result != ISC_R_SUCCESS)
- goto cleanup_buckets;
- res->buckets[i].task = NULL;
- result = isc_task_create(taskmgr, 0, &res->buckets[i].task);
- if (result != ISC_R_SUCCESS) {
- DESTROYLOCK(&res->buckets[i].lock);
- goto cleanup_buckets;
- }
- snprintf(name, sizeof(name), "res%u", i);
- isc_task_setname(res->buckets[i].task, name, res);
- ISC_LIST_INIT(res->buckets[i].fctxs);
- res->buckets[i].exiting = ISC_FALSE;
- buckets_created++;
- }
-
- res->dispatchv4 = NULL;
- if (dispatchv4 != NULL)
- dns_dispatch_attach(dispatchv4, &res->dispatchv4);
- res->dispatchv6 = NULL;
- if (dispatchv6 != NULL)
- dns_dispatch_attach(dispatchv6, &res->dispatchv6);
-
- res->references = 1;
- res->exiting = ISC_FALSE;
- res->frozen = ISC_FALSE;
- ISC_LIST_INIT(res->whenshutdown);
- res->priming = ISC_FALSE;
- res->primefetch = NULL;
- res->nfctx = 0;
-
- result = isc_mutex_init(&res->lock);
- if (result != ISC_R_SUCCESS)
- goto cleanup_dispatches;
-
- result = isc_mutex_init(&res->nlock);
- if (result != ISC_R_SUCCESS)
- goto cleanup_lock;
-
- result = isc_mutex_init(&res->primelock);
- if (result != ISC_R_SUCCESS)
- goto cleanup_nlock;
-
-#if USE_ALGLOCK
- result = isc_rwlock_init(&res->alglock, 0, 0);
- if (result != ISC_R_SUCCESS)
- goto cleanup_primelock;
-#endif
-#if USE_MBSLOCK
- result = isc_rwlock_init(&res->mbslock, 0, 0);
- if (result != ISC_R_SUCCESS)
- goto cleanup_alglock;
-#endif
-
- res->magic = RES_MAGIC;
-
- *resp = res;
-
- return (ISC_R_SUCCESS);
-
-#if USE_MBSLOCK
- cleanup_alglock:
-#if USE_ALGLOCK
- isc_rwlock_destroy(&res->alglock);
-#endif
-#endif
-#if USE_ALGLOCK || USE_MBSLOCK
- cleanup_primelock:
- DESTROYLOCK(&res->primelock);
-#endif
-
- cleanup_nlock:
- DESTROYLOCK(&res->nlock);
-
- cleanup_lock:
- DESTROYLOCK(&res->lock);
-
- cleanup_dispatches:
- if (res->dispatchv6 != NULL)
- dns_dispatch_detach(&res->dispatchv6);
- if (res->dispatchv4 != NULL)
- dns_dispatch_detach(&res->dispatchv4);
-
- cleanup_buckets:
- for (i = 0; i < buckets_created; i++) {
- DESTROYLOCK(&res->buckets[i].lock);
- isc_task_shutdown(res->buckets[i].task);
- isc_task_detach(&res->buckets[i].task);
- }
- isc_mem_put(view->mctx, res->buckets,
- res->nbuckets * sizeof(fctxbucket_t));
-
- cleanup_res:
- isc_mem_put(view->mctx, res, sizeof(*res));
-
- return (result);
-}
-
-static void
-prime_done(isc_task_t *task, isc_event_t *event) {
- dns_resolver_t *res;
- dns_fetchevent_t *fevent;
- dns_fetch_t *fetch;
-
- REQUIRE(event->ev_type == DNS_EVENT_FETCHDONE);
- fevent = (dns_fetchevent_t *)event;
- res = event->ev_arg;
- REQUIRE(VALID_RESOLVER(res));
-
- UNUSED(task);
-
- LOCK(&res->lock);
-
- INSIST(res->priming);
- res->priming = ISC_FALSE;
- LOCK(&res->primelock);
- fetch = res->primefetch;
- res->primefetch = NULL;
- UNLOCK(&res->primelock);
-
- UNLOCK(&res->lock);
-
- if (fevent->node != NULL)
- dns_db_detachnode(fevent->db, &fevent->node);
- if (fevent->db != NULL)
- dns_db_detach(&fevent->db);
- if (dns_rdataset_isassociated(fevent->rdataset))
- dns_rdataset_disassociate(fevent->rdataset);
- INSIST(fevent->sigrdataset == NULL);
-
- isc_mem_put(res->mctx, fevent->rdataset, sizeof(*fevent->rdataset));
-
- isc_event_free(&event);
- dns_resolver_destroyfetch(&fetch);
-}
-
-void
-dns_resolver_prime(dns_resolver_t *res) {
- isc_boolean_t want_priming = ISC_FALSE;
- dns_rdataset_t *rdataset;
- isc_result_t result;
-
- REQUIRE(VALID_RESOLVER(res));
- REQUIRE(res->frozen);
-
- RTRACE("dns_resolver_prime");
-
- LOCK(&res->lock);
-
- if (!res->exiting && !res->priming) {
- INSIST(res->primefetch == NULL);
- res->priming = ISC_TRUE;
- want_priming = ISC_TRUE;
- }
-
- UNLOCK(&res->lock);
-
- if (want_priming) {
- /*
- * To avoid any possible recursive locking problems, we
- * start the priming fetch like any other fetch, and holding
- * no resolver locks. No one else will try to start it
- * because we're the ones who set res->priming to true.
- * Any other callers of dns_resolver_prime() while we're
- * running will see that res->priming is already true and
- * do nothing.
- */
- RTRACE("priming");
- rdataset = isc_mem_get(res->mctx, sizeof(*rdataset));
- if (rdataset == NULL) {
- LOCK(&res->lock);
- INSIST(res->priming);
- INSIST(res->primefetch == NULL);
- res->priming = ISC_FALSE;
- UNLOCK(&res->lock);
- return;
- }
- dns_rdataset_init(rdataset);
- LOCK(&res->primelock);
- result = dns_resolver_createfetch(res, dns_rootname,
- dns_rdatatype_ns,
- NULL, NULL, NULL, 0,
- res->buckets[0].task,
- prime_done,
- res, rdataset, NULL,
- &res->primefetch);
- UNLOCK(&res->primelock);
- if (result != ISC_R_SUCCESS) {
- LOCK(&res->lock);
- INSIST(res->priming);
- res->priming = ISC_FALSE;
- UNLOCK(&res->lock);
- }
- }
-}
-
-void
-dns_resolver_freeze(dns_resolver_t *res) {
-
- /*
- * Freeze resolver.
- */
-
- REQUIRE(VALID_RESOLVER(res));
- REQUIRE(!res->frozen);
-
- res->frozen = ISC_TRUE;
-}
-
-void
-dns_resolver_attach(dns_resolver_t *source, dns_resolver_t **targetp) {
- REQUIRE(VALID_RESOLVER(source));
- REQUIRE(targetp != NULL && *targetp == NULL);
-
- RRTRACE(source, "attach");
- LOCK(&source->lock);
- REQUIRE(!source->exiting);
-
- INSIST(source->references > 0);
- source->references++;
- INSIST(source->references != 0);
- UNLOCK(&source->lock);
-
- *targetp = source;
-}
-
-void
-dns_resolver_whenshutdown(dns_resolver_t *res, isc_task_t *task,
- isc_event_t **eventp)
-{
- isc_task_t *clone;
- isc_event_t *event;
-
- REQUIRE(VALID_RESOLVER(res));
- REQUIRE(eventp != NULL);
-
- event = *eventp;
- *eventp = NULL;
-
- LOCK(&res->lock);
-
- if (res->exiting && res->activebuckets == 0) {
- /*
- * We're already shutdown. Send the event.
- */
- event->ev_sender = res;
- isc_task_send(task, &event);
- } else {
- clone = NULL;
- isc_task_attach(task, &clone);
- event->ev_sender = clone;
- ISC_LIST_APPEND(res->whenshutdown, event, ev_link);
- }
-
- UNLOCK(&res->lock);
-}
-
-void
-dns_resolver_shutdown(dns_resolver_t *res) {
- unsigned int i;
- fetchctx_t *fctx;
- isc_socket_t *sock;
-
- REQUIRE(VALID_RESOLVER(res));
-
- RTRACE("shutdown");
-
- LOCK(&res->lock);
-
- if (!res->exiting) {
- RTRACE("exiting");
- res->exiting = ISC_TRUE;
-
- for (i = 0; i < res->nbuckets; i++) {
- LOCK(&res->buckets[i].lock);
- for (fctx = ISC_LIST_HEAD(res->buckets[i].fctxs);
- fctx != NULL;
- fctx = ISC_LIST_NEXT(fctx, link))
- fctx_shutdown(fctx);
- if (res->dispatchv4 != NULL) {
- sock = dns_dispatch_getsocket(res->dispatchv4);
- isc_socket_cancel(sock, res->buckets[i].task,
- ISC_SOCKCANCEL_ALL);
- }
- if (res->dispatchv6 != NULL) {
- sock = dns_dispatch_getsocket(res->dispatchv6);
- isc_socket_cancel(sock, res->buckets[i].task,
- ISC_SOCKCANCEL_ALL);
- }
- res->buckets[i].exiting = ISC_TRUE;
- if (ISC_LIST_EMPTY(res->buckets[i].fctxs)) {
- INSIST(res->activebuckets > 0);
- res->activebuckets--;
- }
- UNLOCK(&res->buckets[i].lock);
- }
- if (res->activebuckets == 0)
- send_shutdown_events(res);
- }
-
- UNLOCK(&res->lock);
-}
-
-void
-dns_resolver_detach(dns_resolver_t **resp) {
- dns_resolver_t *res;
- isc_boolean_t need_destroy = ISC_FALSE;
-
- REQUIRE(resp != NULL);
- res = *resp;
- REQUIRE(VALID_RESOLVER(res));
-
- RTRACE("detach");
-
- LOCK(&res->lock);
-
- INSIST(res->references > 0);
- res->references--;
- if (res->references == 0) {
- INSIST(res->exiting && res->activebuckets == 0);
- need_destroy = ISC_TRUE;
- }
-
- UNLOCK(&res->lock);
-
- if (need_destroy)
- destroy(res);
-
- *resp = NULL;
-}
-
-static inline isc_boolean_t
-fctx_match(fetchctx_t *fctx, dns_name_t *name, dns_rdatatype_t type,
- unsigned int options)
-{
- if (fctx->type != type || fctx->options != options)
- return (ISC_FALSE);
- return (dns_name_equal(&fctx->name, name));
-}
-
-static inline void
-log_fetch(dns_name_t *name, dns_rdatatype_t type) {
- char namebuf[DNS_NAME_FORMATSIZE];
- char typebuf[DNS_RDATATYPE_FORMATSIZE];
- int level = ISC_LOG_DEBUG(1);
-
- if (! isc_log_wouldlog(dns_lctx, level))
- return;
-
- dns_name_format(name, namebuf, sizeof(namebuf));
- dns_rdatatype_format(type, typebuf, sizeof(typebuf));
-
- isc_log_write(dns_lctx, DNS_LOGCATEGORY_RESOLVER,
- DNS_LOGMODULE_RESOLVER, level,
- "createfetch: %s %s", namebuf, typebuf);
-}
-
-isc_result_t
-dns_resolver_createfetch(dns_resolver_t *res, dns_name_t *name,
- dns_rdatatype_t type,
- dns_name_t *domain, dns_rdataset_t *nameservers,
- dns_forwarders_t *forwarders,
- unsigned int options, isc_task_t *task,
- isc_taskaction_t action, void *arg,
- dns_rdataset_t *rdataset,
- dns_rdataset_t *sigrdataset,
- dns_fetch_t **fetchp)
-{
- dns_fetch_t *fetch;
- fetchctx_t *fctx = NULL;
- isc_result_t result;
- unsigned int bucketnum;
- isc_boolean_t new_fctx = ISC_FALSE;
- isc_event_t *event;
-
- UNUSED(forwarders);
-
- REQUIRE(VALID_RESOLVER(res));
- REQUIRE(res->frozen);
- /* XXXRTH Check for meta type */
- if (domain != NULL) {
- REQUIRE(DNS_RDATASET_VALID(nameservers));
- REQUIRE(nameservers->type == dns_rdatatype_ns);
- } else
- REQUIRE(nameservers == NULL);
- REQUIRE(forwarders == NULL);
- REQUIRE(!dns_rdataset_isassociated(rdataset));
- REQUIRE(sigrdataset == NULL ||
- !dns_rdataset_isassociated(sigrdataset));
- REQUIRE(fetchp != NULL && *fetchp == NULL);
-
- log_fetch(name, type);
-
- /*
- * XXXRTH use a mempool?
- */
- fetch = isc_mem_get(res->mctx, sizeof(*fetch));
- if (fetch == NULL)
- return (ISC_R_NOMEMORY);
-
- bucketnum = dns_name_hash(name, ISC_FALSE) % res->nbuckets;
-
- LOCK(&res->buckets[bucketnum].lock);
-
- if (res->buckets[bucketnum].exiting) {
- result = ISC_R_SHUTTINGDOWN;
- goto unlock;
- }
-
- if ((options & DNS_FETCHOPT_UNSHARED) == 0) {
- for (fctx = ISC_LIST_HEAD(res->buckets[bucketnum].fctxs);
- fctx != NULL;
- fctx = ISC_LIST_NEXT(fctx, link)) {
- if (fctx_match(fctx, name, type, options))
- break;
- }
- }
-
- /*
- * If we didn't have a fetch, would attach to a done fetch, this
- * fetch has already cloned its results, or if the fetch has gone
- * "idle" (no one was interested in it), we need to start a new
- * fetch instead of joining with the existing one.
- */
- if (fctx == NULL ||
- fctx->state == fetchstate_done ||
- fctx->cloned ||
- ISC_LIST_EMPTY(fctx->events)) {
- fctx = NULL;
- result = fctx_create(res, name, type, domain, nameservers,
- options, bucketnum, &fctx);
- if (result != ISC_R_SUCCESS)
- goto unlock;
- new_fctx = ISC_TRUE;
- }
-
- result = fctx_join(fctx, task, action, arg,
- rdataset, sigrdataset, fetch);
- if (new_fctx) {
- if (result == ISC_R_SUCCESS) {
- /*
- * Launch this fctx.
- */
- event = &fctx->control_event;
- ISC_EVENT_INIT(event, sizeof(*event), 0, NULL,
- DNS_EVENT_FETCHCONTROL,
- fctx_start, fctx, NULL,
- NULL, NULL);
- isc_task_send(res->buckets[bucketnum].task, &event);
- } else {
- /*
- * We don't care about the result of fctx_destroy()
- * since we know we're not exiting.
- */
- (void)fctx_destroy(fctx);
- }
- }
-
- unlock:
- UNLOCK(&res->buckets[bucketnum].lock);
-
- if (result == ISC_R_SUCCESS) {
- FTRACE("created");
- *fetchp = fetch;
- } else
- isc_mem_put(res->mctx, fetch, sizeof(*fetch));
-
- return (result);
-}
-
-void
-dns_resolver_cancelfetch(dns_fetch_t *fetch) {
- fetchctx_t *fctx;
- dns_resolver_t *res;
- dns_fetchevent_t *event, *next_event;
- isc_task_t *etask;
-
- REQUIRE(DNS_FETCH_VALID(fetch));
- fctx = fetch->private;
- REQUIRE(VALID_FCTX(fctx));
- res = fctx->res;
-
- FTRACE("cancelfetch");
-
- LOCK(&res->buckets[fctx->bucketnum].lock);
-
- /*
- * Find the completion event for this fetch (as opposed
- * to those for other fetches that have joined the same
- * fctx) and send it with result = ISC_R_CANCELED.
- */
- event = NULL;
- if (fctx->state != fetchstate_done) {
- for (event = ISC_LIST_HEAD(fctx->events);
- event != NULL;
- event = next_event) {
- next_event = ISC_LIST_NEXT(event, ev_link);
- if (event->fetch == fetch) {
- ISC_LIST_UNLINK(fctx->events, event, ev_link);
- break;
- }
- }
- }
- if (event != NULL) {
- etask = event->ev_sender;
- event->ev_sender = fctx;
- event->result = ISC_R_CANCELED;
- isc_task_sendanddetach(&etask, ISC_EVENT_PTR(&event));
- }
- /*
- * The fctx continues running even if no fetches remain;
- * the answer is still cached.
- */
-
- UNLOCK(&res->buckets[fctx->bucketnum].lock);
-}
-
-void
-dns_resolver_destroyfetch(dns_fetch_t **fetchp) {
- dns_fetch_t *fetch;
- dns_resolver_t *res;
- dns_fetchevent_t *event, *next_event;
- fetchctx_t *fctx;
- unsigned int bucketnum;
- isc_boolean_t bucket_empty = ISC_FALSE;
-
- REQUIRE(fetchp != NULL);
- fetch = *fetchp;
- REQUIRE(DNS_FETCH_VALID(fetch));
- fctx = fetch->private;
- REQUIRE(VALID_FCTX(fctx));
- res = fctx->res;
-
- FTRACE("destroyfetch");
-
- bucketnum = fctx->bucketnum;
- LOCK(&res->buckets[bucketnum].lock);
-
- /*
- * Sanity check: the caller should have gotten its event before
- * trying to destroy the fetch.
- */
- event = NULL;
- if (fctx->state != fetchstate_done) {
- for (event = ISC_LIST_HEAD(fctx->events);
- event != NULL;
- event = next_event) {
- next_event = ISC_LIST_NEXT(event, ev_link);
- RUNTIME_CHECK(event->fetch != fetch);
- }
- }
-
- INSIST(fctx->references > 0);
- fctx->references--;
- if (fctx->references == 0) {
- /*
- * No one cares about the result of this fetch anymore.
- */
- if (fctx->pending == 0 && fctx->nqueries == 0 &&
- ISC_LIST_EMPTY(fctx->validators) &&
- SHUTTINGDOWN(fctx)) {
- /*
- * This fctx is already shutdown; we were just
- * waiting for the last reference to go away.
- */
- bucket_empty = fctx_destroy(fctx);
- } else {
- /*
- * Initiate shutdown.
- */
- fctx_shutdown(fctx);
- }
- }
-
- UNLOCK(&res->buckets[bucketnum].lock);
-
- isc_mem_put(res->mctx, fetch, sizeof(*fetch));
- *fetchp = NULL;
-
- if (bucket_empty)
- empty_bucket(res);
-}
-
-dns_dispatchmgr_t *
-dns_resolver_dispatchmgr(dns_resolver_t *resolver) {
- REQUIRE(VALID_RESOLVER(resolver));
- return (resolver->dispatchmgr);
-}
-
-dns_dispatch_t *
-dns_resolver_dispatchv4(dns_resolver_t *resolver) {
- REQUIRE(VALID_RESOLVER(resolver));
- return (resolver->dispatchv4);
-}
-
-dns_dispatch_t *
-dns_resolver_dispatchv6(dns_resolver_t *resolver) {
- REQUIRE(VALID_RESOLVER(resolver));
- return (resolver->dispatchv6);
-}
-
-isc_socketmgr_t *
-dns_resolver_socketmgr(dns_resolver_t *resolver) {
- REQUIRE(VALID_RESOLVER(resolver));
- return (resolver->socketmgr);
-}
-
-isc_taskmgr_t *
-dns_resolver_taskmgr(dns_resolver_t *resolver) {
- REQUIRE(VALID_RESOLVER(resolver));
- return (resolver->taskmgr);
-}
-
-isc_uint32_t
-dns_resolver_getlamettl(dns_resolver_t *resolver) {
- REQUIRE(VALID_RESOLVER(resolver));
- return (resolver->lame_ttl);
-}
-
-void
-dns_resolver_setlamettl(dns_resolver_t *resolver, isc_uint32_t lame_ttl) {
- REQUIRE(VALID_RESOLVER(resolver));
- resolver->lame_ttl = lame_ttl;
-}
-
-unsigned int
-dns_resolver_nrunning(dns_resolver_t *resolver) {
- unsigned int n;
- LOCK(&resolver->nlock);
- n = resolver->nfctx;
- UNLOCK(&resolver->nlock);
- return (n);
-}
-
-isc_result_t
-dns_resolver_addalternate(dns_resolver_t *resolver, isc_sockaddr_t *alt,
- dns_name_t *name, in_port_t port) {
- alternate_t *a;
- isc_result_t result;
-
- REQUIRE(VALID_RESOLVER(resolver));
- REQUIRE(!resolver->frozen);
- REQUIRE((alt == NULL) ^ (name == NULL));
-
- a = isc_mem_get(resolver->mctx, sizeof(*a));
- if (a == NULL)
- return (ISC_R_NOMEMORY);
- if (alt != NULL) {
- a->isaddress = ISC_TRUE;
- a->_u.addr = *alt;
- } else {
- a->isaddress = ISC_FALSE;
- a->_u._n.port = port;
- dns_name_init(&a->_u._n.name, NULL);
- result = dns_name_dup(name, resolver->mctx, &a->_u._n.name);
- if (result != ISC_R_SUCCESS) {
- isc_mem_put(resolver->mctx, a, sizeof(*a));
- return (result);
- }
- }
- ISC_LINK_INIT(a, link);
- ISC_LIST_APPEND(resolver->alternates, a, link);
-
- return (ISC_R_SUCCESS);
-}
-
-void
-dns_resolver_setudpsize(dns_resolver_t *resolver, isc_uint16_t udpsize) {
- REQUIRE(VALID_RESOLVER(resolver));
- resolver->udpsize = udpsize;
-}
-
-isc_uint16_t
-dns_resolver_getudpsize(dns_resolver_t *resolver) {
- REQUIRE(VALID_RESOLVER(resolver));
- return (resolver->udpsize);
-}
-
-static void
-free_algorithm(void *node, void *arg) {
- unsigned char *algorithms = node;
- isc_mem_t *mctx = arg;
-
- isc_mem_put(mctx, algorithms, *algorithms);
-}
-
-void
-dns_resolver_reset_algorithms(dns_resolver_t *resolver) {
-
- REQUIRE(VALID_RESOLVER(resolver));
-
-#if USE_ALGLOCK
- RWLOCK(&resolver->alglock, isc_rwlocktype_write);
-#endif
- if (resolver->algorithms != NULL)
- dns_rbt_destroy(&resolver->algorithms);
-#if USE_ALGLOCK
- RWUNLOCK(&resolver->alglock, isc_rwlocktype_write);
-#endif
-}
-
-isc_result_t
-dns_resolver_disable_algorithm(dns_resolver_t *resolver, dns_name_t *name,
- unsigned int alg)
-{
- unsigned int len, mask;
- unsigned char *new;
- unsigned char *algorithms;
- isc_result_t result;
- dns_rbtnode_t *node = NULL;
-
- REQUIRE(VALID_RESOLVER(resolver));
- if (alg > 255)
- return (ISC_R_RANGE);
-
-#if USE_ALGLOCK
- RWLOCK(&resolver->alglock, isc_rwlocktype_write);
-#endif
- if (resolver->algorithms == NULL) {
- result = dns_rbt_create(resolver->mctx, free_algorithm,
- resolver->mctx, &resolver->algorithms);
- if (result != ISC_R_SUCCESS)
- goto cleanup;
- }
-
- len = alg/8 + 2;
- mask = 1 << (alg%8);
-
- result = dns_rbt_addnode(resolver->algorithms, name, &node);
-
- if (result == ISC_R_SUCCESS || result == ISC_R_EXISTS) {
- algorithms = node->data;
- if (algorithms == NULL || len > *algorithms) {
- new = isc_mem_get(resolver->mctx, len);
- if (new == NULL) {
- result = ISC_R_NOMEMORY;
- goto cleanup;
- }
- memset(new, 0, len);
- if (algorithms != NULL)
- memcpy(new, algorithms, *algorithms);
- new[len-1] |= mask;
- *new = len;
- node->data = new;
- if (algorithms != NULL)
- isc_mem_put(resolver->mctx, algorithms,
- *algorithms);
- } else
- algorithms[len-1] |= mask;
- }
- result = ISC_R_SUCCESS;
- cleanup:
-#if USE_ALGLOCK
- RWUNLOCK(&resolver->alglock, isc_rwlocktype_write);
-#endif
- return (result);
-}
-
-isc_boolean_t
-dns_resolver_algorithm_supported(dns_resolver_t *resolver, dns_name_t *name,
- unsigned int alg)
-{
- unsigned int len, mask;
- unsigned char *algorithms;
- void *data = NULL;
- isc_result_t result;
- isc_boolean_t found = ISC_FALSE;
-
- REQUIRE(VALID_RESOLVER(resolver));
-
-#if USE_ALGLOCK
- RWLOCK(&resolver->alglock, isc_rwlocktype_read);
-#endif
- if (resolver->algorithms == NULL)
- goto unlock;
- result = dns_rbt_findname(resolver->algorithms, name, 0, NULL, &data);
- if (result == ISC_R_SUCCESS || result == DNS_R_PARTIALMATCH) {
- len = alg/8 + 2;
- mask = 1 << (alg%8);
- algorithms = data;
- if (len <= *algorithms && (algorithms[len-1] & mask) != 0)
- found = ISC_TRUE;
- }
- unlock:
-#if USE_ALGLOCK
- RWUNLOCK(&resolver->alglock, isc_rwlocktype_read);
-#endif
- if (found)
- return (ISC_FALSE);
- return (dst_algorithm_supported(alg));
-}
-
-void
-dns_resolver_resetmustbesecure(dns_resolver_t *resolver) {
-
- REQUIRE(VALID_RESOLVER(resolver));
-
-#if USE_MBSLOCK
- RWLOCK(&resolver->mbslock, isc_rwlocktype_write);
-#endif
- if (resolver->mustbesecure != NULL)
- dns_rbt_destroy(&resolver->mustbesecure);
-#if USE_MBSLOCK
- RWUNLOCK(&resolver->mbslock, isc_rwlocktype_write);
-#endif
-}
-
-static isc_boolean_t yes = ISC_TRUE, no = ISC_FALSE;
-
-isc_result_t
-dns_resolver_setmustbesecure(dns_resolver_t *resolver, dns_name_t *name,
- isc_boolean_t value)
-{
- isc_result_t result;
-
- REQUIRE(VALID_RESOLVER(resolver));
-
-#if USE_MBSLOCK
- RWLOCK(&resolver->mbslock, isc_rwlocktype_write);
-#endif
- if (resolver->mustbesecure == NULL) {
- result = dns_rbt_create(resolver->mctx, NULL, NULL,
- &resolver->mustbesecure);
- if (result != ISC_R_SUCCESS)
- goto cleanup;
- }
- result = dns_rbt_addname(resolver->mustbesecure, name,
- value ? &yes : &no);
- cleanup:
-#if USE_MBSLOCK
- RWUNLOCK(&resolver->mbslock, isc_rwlocktype_write);
-#endif
- return (result);
-}
-
-isc_boolean_t
-dns_resolver_getmustbesecure(dns_resolver_t *resolver, dns_name_t *name) {
- void *data = NULL;
- isc_boolean_t value = ISC_FALSE;
- isc_result_t result;
-
- REQUIRE(VALID_RESOLVER(resolver));
-
-#if USE_MBSLOCK
- RWLOCK(&resolver->mbslock, isc_rwlocktype_read);
-#endif
- if (resolver->mustbesecure == NULL)
- goto unlock;
- result = dns_rbt_findname(resolver->mustbesecure, name, 0, NULL, &data);
- if (result == ISC_R_SUCCESS || result == DNS_R_PARTIALMATCH)
- value = *(isc_boolean_t*)data;
- unlock:
-#if USE_MBSLOCK
- RWUNLOCK(&resolver->mbslock, isc_rwlocktype_read);
-#endif
- return (value);
-}