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gecko-dev/netwerk/dns/nsHostResolver.cpp

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/* vim:set ts=4 sw=4 sts=4 et cin: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#if defined(HAVE_RES_NINIT)
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <resolv.h>
#define RES_RETRY_ON_FAILURE
#endif
#include <stdlib.h>
#include <ctime>
#include "nsHostResolver.h"
#include "nsError.h"
#include "nsISupportsBase.h"
#include "nsISupportsUtils.h"
#include "nsAutoPtr.h"
#include "nsPrintfCString.h"
#include "prthread.h"
#include "prerror.h"
#include "prtime.h"
#include "mozilla/Logging.h"
#include "PLDHashTable.h"
#include "plstr.h"
#include "nsURLHelper.h"
#include "nsThreadUtils.h"
#include "GetAddrInfo.h"
#include "mozilla/HashFunctions.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/Telemetry.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/Preferences.h"
using namespace mozilla;
using namespace mozilla::net;
// None of our implementations expose a TTL for negative responses, so we use a
// constant always.
static const unsigned int NEGATIVE_RECORD_LIFETIME = 60;
//----------------------------------------------------------------------------
// Use a persistent thread pool in order to avoid spinning up new threads all the time.
// In particular, thread creation results in a res_init() call from libc which is
// quite expensive.
//
// The pool dynamically grows between 0 and MAX_RESOLVER_THREADS in size. New requests
// go first to an idle thread. If that cannot be found and there are fewer than MAX_RESOLVER_THREADS
// currently in the pool a new thread is created for high priority requests. If
// the new request is at a lower priority a new thread will only be created if
// there are fewer than HighThreadThreshold currently outstanding. If a thread cannot be
// created or an idle thread located for the request it is queued.
//
// When the pool is greater than HighThreadThreshold in size a thread will be destroyed after
// ShortIdleTimeoutSeconds of idle time. Smaller pools use LongIdleTimeoutSeconds for a
// timeout period.
#define HighThreadThreshold MAX_RESOLVER_THREADS_FOR_ANY_PRIORITY
#define LongIdleTimeoutSeconds 300 // for threads 1 -> HighThreadThreshold
#define ShortIdleTimeoutSeconds 60 // for threads HighThreadThreshold+1 -> MAX_RESOLVER_THREADS
PR_STATIC_ASSERT (HighThreadThreshold <= MAX_RESOLVER_THREADS);
//----------------------------------------------------------------------------
static LazyLogModule gHostResolverLog("nsHostResolver");
#define LOG(args) MOZ_LOG(gHostResolverLog, mozilla::LogLevel::Debug, args)
#define LOG_HOST(host, interface) host, \
(interface && interface[0] != '\0') ? " on interface " : "", \
(interface && interface[0] != '\0') ? interface : ""
//----------------------------------------------------------------------------
static inline void
MoveCList(PRCList &from, PRCList &to)
{
if (!PR_CLIST_IS_EMPTY(&from)) {
to.next = from.next;
to.prev = from.prev;
to.next->prev = &to;
to.prev->next = &to;
PR_INIT_CLIST(&from);
}
}
//----------------------------------------------------------------------------
#if defined(RES_RETRY_ON_FAILURE)
// this class represents the resolver state for a given thread. if we
// encounter a lookup failure, then we can invoke the Reset method on an
// instance of this class to reset the resolver (in case /etc/resolv.conf
// for example changed). this is mainly an issue on GNU systems since glibc
// only reads in /etc/resolv.conf once per thread. it may be an issue on
// other systems as well.
class nsResState
{
public:
nsResState()
// initialize mLastReset to the time when this object
// is created. this means that a reset will not occur
// if a thread is too young. the alternative would be
// to initialize this to the beginning of time, so that
// the first failure would cause a reset, but since the
// thread would have just started up, it likely would
// already have current /etc/resolv.conf info.
: mLastReset(PR_IntervalNow())
{
}
bool Reset()
{
// reset no more than once per second
if (PR_IntervalToSeconds(PR_IntervalNow() - mLastReset) < 1)
return false;
LOG(("Calling 'res_ninit'.\n"));
mLastReset = PR_IntervalNow();
return (res_ninit(&_res) == 0);
}
private:
PRIntervalTime mLastReset;
};
#endif // RES_RETRY_ON_FAILURE
//----------------------------------------------------------------------------
static inline bool
IsHighPriority(uint16_t flags)
{
return !(flags & (nsHostResolver::RES_PRIORITY_LOW | nsHostResolver::RES_PRIORITY_MEDIUM));
}
static inline bool
IsMediumPriority(uint16_t flags)
{
return flags & nsHostResolver::RES_PRIORITY_MEDIUM;
}
static inline bool
IsLowPriority(uint16_t flags)
{
return flags & nsHostResolver::RES_PRIORITY_LOW;
}
//----------------------------------------------------------------------------
// this macro filters out any flags that are not used when constructing the
// host key. the significant flags are those that would affect the resulting
// host record (i.e., the flags that are passed down to PR_GetAddrInfoByName).
#define RES_KEY_FLAGS(_f) ((_f) & nsHostResolver::RES_CANON_NAME)
nsHostRecord::nsHostRecord(const nsHostKey *key)
: addr_info_lock("nsHostRecord.addr_info_lock")
, addr_info_gencnt(0)
, addr_info(nullptr)
, addr(nullptr)
, negative(false)
, resolving(false)
, onQueue(false)
, usingAnyThread(false)
, mDoomed(false)
#if TTL_AVAILABLE
, mGetTtl(false)
#endif
, mBlacklistedCount(0)
, mResolveAgain(false)
{
host = ((char *) this) + sizeof(nsHostRecord);
memcpy((char *) host, key->host, strlen(key->host) + 1);
flags = key->flags;
af = key->af;
netInterface = host + strlen(key->host) + 1;
memcpy((char *) netInterface, key->netInterface,
strlen(key->netInterface) + 1);
PR_INIT_CLIST(this);
PR_INIT_CLIST(&callbacks);
}
nsresult
nsHostRecord::Create(const nsHostKey *key, nsHostRecord **result)
{
size_t hostLen = strlen(key->host) + 1;
size_t netInterfaceLen = strlen(key->netInterface) + 1;
size_t size = hostLen + netInterfaceLen + sizeof(nsHostRecord);
// Use placement new to create the object with room for the hostname and
// network interface name allocated after it.
void *place = ::operator new(size);
*result = new(place) nsHostRecord(key);
NS_ADDREF(*result);
return NS_OK;
}
void
nsHostRecord::SetExpiration(const mozilla::TimeStamp& now, unsigned int valid, unsigned int grace)
{
mValidStart = now;
mGraceStart = now + TimeDuration::FromSeconds(valid);
mValidEnd = now + TimeDuration::FromSeconds(valid + grace);
}
void
nsHostRecord::CopyExpirationTimesAndFlagsFrom(const nsHostRecord *aFromHostRecord)
{
// This is used to copy information from a cache entry to a record. All
// information necessary for HasUsableRecord needs to be copied.
mValidStart = aFromHostRecord->mValidStart;
mValidEnd = aFromHostRecord->mValidEnd;
mGraceStart = aFromHostRecord->mGraceStart;
mDoomed = aFromHostRecord->mDoomed;
}
nsHostRecord::~nsHostRecord()
{
Telemetry::Accumulate(Telemetry::DNS_BLACKLIST_COUNT, mBlacklistedCount);
delete addr_info;
delete addr;
}
bool
nsHostRecord::Blacklisted(NetAddr *aQuery)
{
// must call locked
LOG(("Checking blacklist for host [%s%s%s], host record [%p].\n",
LOG_HOST(host, netInterface), this));
// skip the string conversion for the common case of no blacklist
if (!mBlacklistedItems.Length()) {
return false;
}
char buf[kIPv6CStrBufSize];
if (!NetAddrToString(aQuery, buf, sizeof(buf))) {
return false;
}
nsDependentCString strQuery(buf);
for (uint32_t i = 0; i < mBlacklistedItems.Length(); i++) {
if (mBlacklistedItems.ElementAt(i).Equals(strQuery)) {
LOG(("Address [%s] is blacklisted for host [%s%s%s].\n", buf,
LOG_HOST(host, netInterface)));
return true;
}
}
return false;
}
void
nsHostRecord::ReportUnusable(NetAddr *aAddress)
{
// must call locked
LOG(("Adding address to blacklist for host [%s%s%s], host record [%p].\n",
LOG_HOST(host, netInterface), this));
++mBlacklistedCount;
if (negative)
mDoomed = true;
char buf[kIPv6CStrBufSize];
if (NetAddrToString(aAddress, buf, sizeof(buf))) {
LOG(("Successfully adding address [%s] to blacklist for host "
"[%s%s%s].\n", buf, LOG_HOST(host, netInterface)));
mBlacklistedItems.AppendElement(nsCString(buf));
}
}
void
nsHostRecord::ResetBlacklist()
{
// must call locked
LOG(("Resetting blacklist for host [%s%s%s], host record [%p].\n",
LOG_HOST(host, netInterface), this));
mBlacklistedItems.Clear();
}
nsHostRecord::ExpirationStatus
nsHostRecord::CheckExpiration(const mozilla::TimeStamp& now) const {
if (!mGraceStart.IsNull() && now >= mGraceStart
&& !mValidEnd.IsNull() && now < mValidEnd) {
return nsHostRecord::EXP_GRACE;
} else if (!mValidEnd.IsNull() && now < mValidEnd) {
return nsHostRecord::EXP_VALID;
}
return nsHostRecord::EXP_EXPIRED;
}
bool
nsHostRecord::HasUsableResult(const mozilla::TimeStamp& now, uint16_t queryFlags) const
{
if (mDoomed) {
return false;
}
// don't use cached negative results for high priority queries.
if (negative && IsHighPriority(queryFlags)) {
return false;
}
if (CheckExpiration(now) == EXP_EXPIRED) {
return false;
}
return addr_info || addr || negative;
}
static size_t
SizeOfResolveHostCallbackListExcludingHead(const PRCList *head,
MallocSizeOf mallocSizeOf)
{
size_t n = 0;
PRCList *curr = head->next;
while (curr != head) {
nsResolveHostCallback *callback =
static_cast<nsResolveHostCallback*>(curr);
n += callback->SizeOfIncludingThis(mallocSizeOf);
curr = curr->next;
}
return n;
}
size_t
nsHostRecord::SizeOfIncludingThis(MallocSizeOf mallocSizeOf) const
{
size_t n = mallocSizeOf(this);
// The |host| field (inherited from nsHostKey) actually points to extra
// memory that is allocated beyond the end of the nsHostRecord (see
// nsHostRecord::Create()). So it will be included in the
// |mallocSizeOf(this)| call above.
n += SizeOfResolveHostCallbackListExcludingHead(&callbacks, mallocSizeOf);
n += addr_info ? addr_info->SizeOfIncludingThis(mallocSizeOf) : 0;
n += mallocSizeOf(addr);
n += mBlacklistedItems.ShallowSizeOfExcludingThis(mallocSizeOf);
for (size_t i = 0; i < mBlacklistedItems.Length(); i++) {
n += mBlacklistedItems[i].SizeOfExcludingThisIfUnshared(mallocSizeOf);
}
return n;
}
nsHostRecord::DnsPriority
nsHostRecord::GetPriority(uint16_t aFlags)
{
if (IsHighPriority(aFlags)){
return nsHostRecord::DNS_PRIORITY_HIGH;
} else if (IsMediumPriority(aFlags)) {
return nsHostRecord::DNS_PRIORITY_MEDIUM;
}
return nsHostRecord::DNS_PRIORITY_LOW;
}
// Returns true if the entry can be removed, or false if it should be left.
// Sets mResolveAgain true for entries being resolved right now.
bool
nsHostRecord::RemoveOrRefresh()
{
if (resolving) {
if (!onQueue) {
// The request has been passed to the OS resolver. The resultant DNS
// record should be considered stale and not trusted; set a flag to
// ensure it is called again.
mResolveAgain = true;
}
// if Onqueue is true, the host entry is already added to the cache
// but is still pending to get resolved: just leave it in hash.
return false;
}
// Already resolved; not in a pending state; remove from cache.
return true;
}
//----------------------------------------------------------------------------
struct nsHostDBEnt : PLDHashEntryHdr
{
nsHostRecord *rec;
};
static PLDHashNumber
HostDB_HashKey(const void *key)
{
const nsHostKey *hk = static_cast<const nsHostKey *>(key);
return AddToHash(HashString(hk->host), RES_KEY_FLAGS(hk->flags), hk->af,
HashString(hk->netInterface));
}
static bool
HostDB_MatchEntry(const PLDHashEntryHdr *entry,
const void *key)
{
const nsHostDBEnt *he = static_cast<const nsHostDBEnt *>(entry);
const nsHostKey *hk = static_cast<const nsHostKey *>(key);
return !strcmp(he->rec->host ? he->rec->host : "",
hk->host ? hk->host : "") &&
RES_KEY_FLAGS (he->rec->flags) == RES_KEY_FLAGS(hk->flags) &&
he->rec->af == hk->af &&
!strcmp(he->rec->netInterface, hk->netInterface);
}
static void
HostDB_MoveEntry(PLDHashTable *table,
const PLDHashEntryHdr *from,
PLDHashEntryHdr *to)
{
static_cast<nsHostDBEnt *>(to)->rec =
static_cast<const nsHostDBEnt *>(from)->rec;
}
static void
HostDB_ClearEntry(PLDHashTable *table,
PLDHashEntryHdr *entry)
{
nsHostDBEnt *he = static_cast<nsHostDBEnt*>(entry);
MOZ_ASSERT(he, "nsHostDBEnt is null!");
nsHostRecord *hr = he->rec;
MOZ_ASSERT(hr, "nsHostDBEnt has null host record!");
LOG(("Clearing cache db entry for host [%s%s%s].\n",
LOG_HOST(hr->host, hr->netInterface)));
#if defined(DEBUG)
{
MutexAutoLock lock(hr->addr_info_lock);
if (!hr->addr_info) {
LOG(("No address info for host [%s%s%s].\n",
LOG_HOST(hr->host, hr->netInterface)));
} else {
if (!hr->mValidEnd.IsNull()) {
TimeDuration diff = hr->mValidEnd - TimeStamp::NowLoRes();
LOG(("Record for host [%s%s%s] expires in %f seconds.\n",
LOG_HOST(hr->host, hr->netInterface),
diff.ToSeconds()));
} else {
LOG(("Record for host [%s%s%s] not yet valid.\n",
LOG_HOST(hr->host, hr->netInterface)));
}
NetAddrElement *addrElement = nullptr;
char buf[kIPv6CStrBufSize];
do {
if (!addrElement) {
addrElement = hr->addr_info->mAddresses.getFirst();
} else {
addrElement = addrElement->getNext();
}
if (addrElement) {
NetAddrToString(&addrElement->mAddress, buf, sizeof(buf));
LOG((" [%s]\n", buf));
}
}
while (addrElement);
}
}
#endif
NS_RELEASE(he->rec);
}
static void
HostDB_InitEntry(PLDHashEntryHdr *entry,
const void *key)
{
nsHostDBEnt *he = static_cast<nsHostDBEnt *>(entry);
nsHostRecord::Create(static_cast<const nsHostKey *>(key), &he->rec);
}
static const PLDHashTableOps gHostDB_ops =
{
HostDB_HashKey,
HostDB_MatchEntry,
HostDB_MoveEntry,
HostDB_ClearEntry,
HostDB_InitEntry,
};
//----------------------------------------------------------------------------
#if TTL_AVAILABLE
static const char kPrefGetTtl[] = "network.dns.get-ttl";
static bool sGetTtlEnabled = false;
static void DnsPrefChanged(const char* aPref, void* aClosure)
{
MOZ_ASSERT(NS_IsMainThread(),
"Should be getting pref changed notification on main thread!");
if (strcmp(aPref, kPrefGetTtl) != 0) {
LOG(("DnsPrefChanged ignoring pref \"%s\"", aPref));
return;
}
auto self = static_cast<nsHostResolver*>(aClosure);
MOZ_ASSERT(self);
sGetTtlEnabled = Preferences::GetBool(kPrefGetTtl);
}
#endif
nsHostResolver::nsHostResolver(uint32_t maxCacheEntries,
uint32_t defaultCacheEntryLifetime,
uint32_t defaultGracePeriod)
: mMaxCacheEntries(maxCacheEntries)
, mDefaultCacheLifetime(defaultCacheEntryLifetime)
, mDefaultGracePeriod(defaultGracePeriod)
, mLock("nsHostResolver.mLock")
, mIdleThreadCV(mLock, "nsHostResolver.mIdleThreadCV")
, mDB(&gHostDB_ops, sizeof(nsHostDBEnt), 0)
, mEvictionQSize(0)
, mShutdown(true)
, mNumIdleThreads(0)
, mThreadCount(0)
, mActiveAnyThreadCount(0)
, mPendingCount(0)
{
mCreationTime = PR_Now();
PR_INIT_CLIST(&mHighQ);
PR_INIT_CLIST(&mMediumQ);
PR_INIT_CLIST(&mLowQ);
PR_INIT_CLIST(&mEvictionQ);
mLongIdleTimeout = PR_SecondsToInterval(LongIdleTimeoutSeconds);
mShortIdleTimeout = PR_SecondsToInterval(ShortIdleTimeoutSeconds);
}
nsHostResolver::~nsHostResolver()
{
}
nsresult
nsHostResolver::Init()
{
if (NS_FAILED(GetAddrInfoInit())) {
return NS_ERROR_FAILURE;
}
mShutdown = false;
#if TTL_AVAILABLE
// The preferences probably haven't been loaded from the disk yet, so we
// need to register a callback that will set up the experiment once they
// are. We also need to explicitly set a value for the props otherwise the
// callback won't be called.
{
DebugOnly<nsresult> rv = Preferences::RegisterCallbackAndCall(
&DnsPrefChanged, kPrefGetTtl, this);
NS_WARN_IF_FALSE(NS_SUCCEEDED(rv),
"Could not register DNS TTL pref callback.");
}
#endif
#if defined(HAVE_RES_NINIT)
// We want to make sure the system is using the correct resolver settings,
// so we force it to reload those settings whenever we startup a subsequent
// nsHostResolver instance. We assume that there is no reason to do this
// for the first nsHostResolver instance since that is usually created
// during application startup.
static int initCount = 0;
if (initCount++ > 0) {
LOG(("Calling 'res_ninit'.\n"));
res_ninit(&_res);
}
#endif
return NS_OK;
}
void
nsHostResolver::ClearPendingQueue(PRCList *aPendingQ)
{
// loop through pending queue, erroring out pending lookups.
if (!PR_CLIST_IS_EMPTY(aPendingQ)) {
PRCList *node = aPendingQ->next;
while (node != aPendingQ) {
nsHostRecord *rec = static_cast<nsHostRecord *>(node);
node = node->next;
OnLookupComplete(rec, NS_ERROR_ABORT, nullptr);
}
}
}
//
// FlushCache() is what we call when the network has changed. We must not
// trust names that were resolved before this change. They may resolve
// differently now.
//
// This function removes all existing resolved host entries from the hash.
// Names that are in the pending queues can be left there. Entries in the
// cache that have 'Resolve' set true but not 'onQueue' are being resolved
// right now, so we need to mark them to get re-resolved on completion!
void
nsHostResolver::FlushCache()
{
MutexAutoLock lock(mLock);
mEvictionQSize = 0;
// Clear the evictionQ and remove all its corresponding entries from
// the cache first
if (!PR_CLIST_IS_EMPTY(&mEvictionQ)) {
PRCList *node = mEvictionQ.next;
while (node != &mEvictionQ) {
nsHostRecord *rec = static_cast<nsHostRecord *>(node);
node = node->next;
PR_REMOVE_AND_INIT_LINK(rec);
mDB.Remove((nsHostKey *) rec);
NS_RELEASE(rec);
}
}
// Refresh the cache entries that are resolving RIGHT now, remove the rest.
for (auto iter = mDB.Iter(); !iter.Done(); iter.Next()) {
auto entry = static_cast<nsHostDBEnt *>(iter.Get());
// Try to remove the record, or mark it for refresh.
if (entry->rec->RemoveOrRefresh()) {
PR_REMOVE_LINK(entry->rec);
iter.Remove();
}
}
}
void
nsHostResolver::Shutdown()
{
LOG(("Shutting down host resolver.\n"));
#if TTL_AVAILABLE
{
DebugOnly<nsresult> rv = Preferences::UnregisterCallback(
&DnsPrefChanged, kPrefGetTtl, this);
NS_WARN_IF_FALSE(NS_SUCCEEDED(rv),
"Could not unregister DNS TTL pref callback.");
}
#endif
PRCList pendingQHigh, pendingQMed, pendingQLow, evictionQ;
PR_INIT_CLIST(&pendingQHigh);
PR_INIT_CLIST(&pendingQMed);
PR_INIT_CLIST(&pendingQLow);
PR_INIT_CLIST(&evictionQ);
{
MutexAutoLock lock(mLock);
mShutdown = true;
MoveCList(mHighQ, pendingQHigh);
MoveCList(mMediumQ, pendingQMed);
MoveCList(mLowQ, pendingQLow);
MoveCList(mEvictionQ, evictionQ);
mEvictionQSize = 0;
mPendingCount = 0;
if (mNumIdleThreads)
mIdleThreadCV.NotifyAll();
// empty host database
mDB.Clear();
}
ClearPendingQueue(&pendingQHigh);
ClearPendingQueue(&pendingQMed);
ClearPendingQueue(&pendingQLow);
if (!PR_CLIST_IS_EMPTY(&evictionQ)) {
PRCList *node = evictionQ.next;
while (node != &evictionQ) {
nsHostRecord *rec = static_cast<nsHostRecord *>(node);
node = node->next;
NS_RELEASE(rec);
}
}
#ifdef NS_BUILD_REFCNT_LOGGING
// Logically join the outstanding worker threads with a timeout.
// Use this approach instead of PR_JoinThread() because that does
// not allow a timeout which may be necessary for a semi-responsive
// shutdown if the thread is blocked on a very slow DNS resolution.
// mThreadCount is read outside of mLock, but the worst case
// scenario for that race is one extra 25ms sleep.
PRIntervalTime delay = PR_MillisecondsToInterval(25);
PRIntervalTime stopTime = PR_IntervalNow() + PR_SecondsToInterval(20);
while (mThreadCount && PR_IntervalNow() < stopTime)
PR_Sleep(delay);
#endif
{
mozilla::DebugOnly<nsresult> rv = GetAddrInfoShutdown();
NS_WARN_IF_FALSE(NS_SUCCEEDED(rv), "Failed to shutdown GetAddrInfo");
}
}
void
nsHostResolver::MoveQueue(nsHostRecord *aRec, PRCList &aDestQ)
{
NS_ASSERTION(aRec->onQueue, "Moving Host Record Not Currently Queued");
PR_REMOVE_LINK(aRec);
PR_APPEND_LINK(aRec, &aDestQ);
}
nsresult
nsHostResolver::ResolveHost(const char *host,
uint16_t flags,
uint16_t af,
const char *netInterface,
nsResolveHostCallback *callback)
{
NS_ENSURE_TRUE(host && *host, NS_ERROR_UNEXPECTED);
NS_ENSURE_TRUE(netInterface, NS_ERROR_UNEXPECTED);
LOG(("Resolving host [%s%s%s]%s.\n", LOG_HOST(host, netInterface),
flags & RES_BYPASS_CACHE ? " - bypassing cache" : ""));
// ensure that we are working with a valid hostname before proceeding. see
// bug 304904 for details.
if (!net_IsValidHostName(nsDependentCString(host)))
return NS_ERROR_UNKNOWN_HOST;
// if result is set inside the lock, then we need to issue the
// callback before returning.
RefPtr<nsHostRecord> result;
nsresult status = NS_OK, rv = NS_OK;
{
MutexAutoLock lock(mLock);
if (mShutdown)
rv = NS_ERROR_NOT_INITIALIZED;
else {
// Used to try to parse to an IP address literal.
PRNetAddr tempAddr;
// Unfortunately, PR_StringToNetAddr does not properly initialize
// the output buffer in the case of IPv6 input. See bug 223145.
memset(&tempAddr, 0, sizeof(PRNetAddr));
// check to see if there is already an entry for this |host|
// in the hash table. if so, then check to see if we can't
// just reuse the lookup result. otherwise, if there are
// any pending callbacks, then add to pending callbacks queue,
// and return. otherwise, add ourselves as first pending
// callback, and proceed to do the lookup.
nsHostKey key = { host, flags, af, netInterface };
auto he = static_cast<nsHostDBEnt*>(mDB.Add(&key, fallible));
// if the record is null, the hash table OOM'd.
if (!he) {
LOG((" Out of memory: no cache entry for host [%s%s%s].\n",
LOG_HOST(host, netInterface)));
rv = NS_ERROR_OUT_OF_MEMORY;
}
// do we have a cached result that we can reuse?
else if (!(flags & RES_BYPASS_CACHE) &&
he->rec->HasUsableResult(TimeStamp::NowLoRes(), flags)) {
LOG((" Using cached record for host [%s%s%s].\n",
LOG_HOST(host, netInterface)));
// put reference to host record on stack...
result = he->rec;
Telemetry::Accumulate(Telemetry::DNS_LOOKUP_METHOD2, METHOD_HIT);
// For entries that are in the grace period
// or all cached negative entries, use the cache but start a new
// lookup in the background
ConditionallyRefreshRecord(he->rec, host);
if (he->rec->negative) {
LOG((" Negative cache entry for host [%s%s%s].\n",
LOG_HOST(host, netInterface)));
Telemetry::Accumulate(Telemetry::DNS_LOOKUP_METHOD2,
METHOD_NEGATIVE_HIT);
status = NS_ERROR_UNKNOWN_HOST;
}
}
// if the host name is an IP address literal and has been parsed,
// go ahead and use it.
else if (he->rec->addr) {
LOG((" Using cached address for IP Literal [%s].\n", host));
Telemetry::Accumulate(Telemetry::DNS_LOOKUP_METHOD2,
METHOD_LITERAL);
result = he->rec;
}
// try parsing the host name as an IP address literal to short
// circuit full host resolution. (this is necessary on some
// platforms like Win9x. see bug 219376 for more details.)
else if (PR_StringToNetAddr(host, &tempAddr) == PR_SUCCESS) {
LOG((" Host is IP Literal [%s].\n", host));
// ok, just copy the result into the host record, and be done
// with it! ;-)
he->rec->addr = new NetAddr();
PRNetAddrToNetAddr(&tempAddr, he->rec->addr);
// put reference to host record on stack...
Telemetry::Accumulate(Telemetry::DNS_LOOKUP_METHOD2,
METHOD_LITERAL);
result = he->rec;
}
else if (mPendingCount >= MAX_NON_PRIORITY_REQUESTS &&
!IsHighPriority(flags) &&
!he->rec->resolving) {
LOG((" Lookup queue full: dropping %s priority request for "
"host [%s%s%s].\n",
IsMediumPriority(flags) ? "medium" : "low",
LOG_HOST(host, netInterface)));
Telemetry::Accumulate(Telemetry::DNS_LOOKUP_METHOD2,
METHOD_OVERFLOW);
// This is a lower priority request and we are swamped, so refuse it.
rv = NS_ERROR_DNS_LOOKUP_QUEUE_FULL;
}
else if (flags & RES_OFFLINE) {
LOG((" Offline request for host [%s%s%s]; ignoring.\n",
LOG_HOST(host, netInterface)));
rv = NS_ERROR_OFFLINE;
}
// If this is an IPV4 or IPV6 specific request, check if there is
// an AF_UNSPEC entry we can use. Otherwise, hit the resolver...
else if (!he->rec->resolving) {
if (!(flags & RES_BYPASS_CACHE) &&
((af == PR_AF_INET) || (af == PR_AF_INET6))) {
// First, search for an entry with AF_UNSPEC
const nsHostKey unspecKey = { host, flags, PR_AF_UNSPEC,
netInterface };
auto unspecHe =
static_cast<nsHostDBEnt*>(mDB.Search(&unspecKey));
NS_ASSERTION(!unspecHe ||
(unspecHe && unspecHe->rec),
"Valid host entries should contain a record");
TimeStamp now = TimeStamp::NowLoRes();
if (unspecHe &&
unspecHe->rec->HasUsableResult(now, flags)) {
MOZ_ASSERT(unspecHe->rec->addr_info || unspecHe->rec->negative,
"Entry should be resolved or negative.");
LOG((" Trying AF_UNSPEC entry for host [%s%s%s] af: %s.\n",
LOG_HOST(host, netInterface),
(af == PR_AF_INET) ? "AF_INET" : "AF_INET6"));
he->rec->addr_info = nullptr;
if (unspecHe->rec->negative) {
he->rec->negative = unspecHe->rec->negative;
he->rec->CopyExpirationTimesAndFlagsFrom(unspecHe->rec);
} else if (unspecHe->rec->addr_info) {
// Search for any valid address in the AF_UNSPEC entry
// in the cache (not blacklisted and from the right
// family).
NetAddrElement *addrIter =
unspecHe->rec->addr_info->mAddresses.getFirst();
while (addrIter) {
if ((af == addrIter->mAddress.inet.family) &&
!unspecHe->rec->Blacklisted(&addrIter->mAddress)) {
if (!he->rec->addr_info) {
he->rec->addr_info = new AddrInfo(
unspecHe->rec->addr_info->mHostName,
unspecHe->rec->addr_info->mCanonicalName);
he->rec->CopyExpirationTimesAndFlagsFrom(unspecHe->rec);
}
he->rec->addr_info->AddAddress(
new NetAddrElement(*addrIter));
}
addrIter = addrIter->getNext();
}
}
// Now check if we have a new record.
if (he->rec->HasUsableResult(now, flags)) {
result = he->rec;
if (he->rec->negative) {
status = NS_ERROR_UNKNOWN_HOST;
}
Telemetry::Accumulate(Telemetry::DNS_LOOKUP_METHOD2,
METHOD_HIT);
ConditionallyRefreshRecord(he->rec, host);
}
// For AF_INET6, a new lookup means another AF_UNSPEC
// lookup. We have already iterated through the
// AF_UNSPEC addresses, so we mark this record as
// negative.
else if (af == PR_AF_INET6) {
LOG((" No AF_INET6 in AF_UNSPEC entry: "
"host [%s%s%s] unknown host.",
LOG_HOST(host, netInterface)));
result = he->rec;
he->rec->negative = true;
status = NS_ERROR_UNKNOWN_HOST;
Telemetry::Accumulate(Telemetry::DNS_LOOKUP_METHOD2,
METHOD_NEGATIVE_HIT);
}
}
}
// If no valid address was found in the cache or this is an
// AF_UNSPEC request, then start a new lookup.
if (!result) {
LOG((" No usable address in cache for host [%s%s%s].",
LOG_HOST(host, netInterface)));
// Add callback to the list of pending callbacks.
PR_APPEND_LINK(callback, &he->rec->callbacks);
he->rec->flags = flags;
rv = IssueLookup(he->rec);
Telemetry::Accumulate(Telemetry::DNS_LOOKUP_METHOD2,
METHOD_NETWORK_FIRST);
if (NS_FAILED(rv)) {
PR_REMOVE_AND_INIT_LINK(callback);
}
else {
LOG((" DNS lookup for host [%s%s%s] blocking "
"pending 'getaddrinfo' query: callback [%p]",
LOG_HOST(host, netInterface), callback));
}
}
}
else {
LOG((" Host [%s%s%s] is being resolved. Appending callback "
"[%p].", LOG_HOST(host, netInterface), callback));
PR_APPEND_LINK(callback, &he->rec->callbacks);
if (he->rec->onQueue) {
Telemetry::Accumulate(Telemetry::DNS_LOOKUP_METHOD2,
METHOD_NETWORK_SHARED);
// Consider the case where we are on a pending queue of
// lower priority than the request is being made at.
// In that case we should upgrade to the higher queue.
if (IsHighPriority(flags) &&
!IsHighPriority(he->rec->flags)) {
// Move from (low|med) to high.
MoveQueue(he->rec, mHighQ);
he->rec->flags = flags;
ConditionallyCreateThread(he->rec);
} else if (IsMediumPriority(flags) &&
IsLowPriority(he->rec->flags)) {
// Move from low to med.
MoveQueue(he->rec, mMediumQ);
he->rec->flags = flags;
mIdleThreadCV.Notify();
}
}
}
}
}
if (result) {
callback->OnLookupComplete(this, result, status);
}
return rv;
}
void
nsHostResolver::DetachCallback(const char *host,
uint16_t flags,
uint16_t af,
const char *netInterface,
nsResolveHostCallback *callback,
nsresult status)
{
RefPtr<nsHostRecord> rec;
{
MutexAutoLock lock(mLock);
nsHostKey key = { host, flags, af, netInterface };
auto he = static_cast<nsHostDBEnt*>(mDB.Search(&key));
if (he) {
// walk list looking for |callback|... we cannot assume
// that it will be there!
PRCList *node = he->rec->callbacks.next;
while (node != &he->rec->callbacks) {
if (static_cast<nsResolveHostCallback *>(node) == callback) {
PR_REMOVE_LINK(callback);
rec = he->rec;
break;
}
node = node->next;
}
}
}
// complete callback with the given status code; this would only be done if
// the record was in the process of being resolved.
if (rec)
callback->OnLookupComplete(this, rec, status);
}
nsresult
nsHostResolver::ConditionallyCreateThread(nsHostRecord *rec)
{
if (mNumIdleThreads) {
// wake up idle thread to process this lookup
mIdleThreadCV.Notify();
}
else if ((mThreadCount < HighThreadThreshold) ||
(IsHighPriority(rec->flags) && mThreadCount < MAX_RESOLVER_THREADS)) {
// dispatch new worker thread
NS_ADDREF_THIS(); // owning reference passed to thread
mThreadCount++;
PRThread *thr = PR_CreateThread(PR_SYSTEM_THREAD,
ThreadFunc,
this,
PR_PRIORITY_NORMAL,
PR_GLOBAL_THREAD,
PR_UNJOINABLE_THREAD,
0);
if (!thr) {
mThreadCount--;
NS_RELEASE_THIS();
return NS_ERROR_OUT_OF_MEMORY;
}
}
else {
LOG((" Unable to find a thread for looking up host [%s%s%s].\n",
LOG_HOST(rec->host, rec->netInterface)));
}
return NS_OK;
}
nsresult
nsHostResolver::IssueLookup(nsHostRecord *rec)
{
nsresult rv = NS_OK;
NS_ASSERTION(!rec->resolving, "record is already being resolved");
// Add rec to one of the pending queues, possibly removing it from mEvictionQ.
// If rec is on mEvictionQ, then we can just move the owning
// reference over to the new active queue.
if (rec->next == rec)
NS_ADDREF(rec);
else {
PR_REMOVE_LINK(rec);
mEvictionQSize--;
}
switch (nsHostRecord::GetPriority(rec->flags)) {
case nsHostRecord::DNS_PRIORITY_HIGH:
PR_APPEND_LINK(rec, &mHighQ);
break;
case nsHostRecord::DNS_PRIORITY_MEDIUM:
PR_APPEND_LINK(rec, &mMediumQ);
break;
case nsHostRecord::DNS_PRIORITY_LOW:
PR_APPEND_LINK(rec, &mLowQ);
break;
}
mPendingCount++;
rec->resolving = true;
rec->onQueue = true;
rv = ConditionallyCreateThread(rec);
LOG ((" DNS thread counters: total=%d any-live=%d idle=%d pending=%d\n",
static_cast<uint32_t>(mThreadCount),
static_cast<uint32_t>(mActiveAnyThreadCount),
static_cast<uint32_t>(mNumIdleThreads),
static_cast<uint32_t>(mPendingCount)));
return rv;
}
nsresult
nsHostResolver::ConditionallyRefreshRecord(nsHostRecord *rec, const char *host)
{
if ((rec->CheckExpiration(TimeStamp::NowLoRes()) != nsHostRecord::EXP_VALID
|| rec->negative) && !rec->resolving) {
LOG((" Using %s cache entry for host [%s] but starting async renewal.",
rec->negative ? "negative" :"positive", host));
IssueLookup(rec);
if (!rec->negative) {
// negative entries are constantly being refreshed, only
// track positive grace period induced renewals
Telemetry::Accumulate(Telemetry::DNS_LOOKUP_METHOD2,
METHOD_RENEWAL);
}
}
return NS_OK;
}
void
nsHostResolver::DeQueue(PRCList &aQ, nsHostRecord **aResult)
{
*aResult = static_cast<nsHostRecord *>(aQ.next);
PR_REMOVE_AND_INIT_LINK(*aResult);
mPendingCount--;
(*aResult)->onQueue = false;
}
bool
nsHostResolver::GetHostToLookup(nsHostRecord **result)
{
bool timedOut = false;
PRIntervalTime epoch, now, timeout;
MutexAutoLock lock(mLock);
timeout = (mNumIdleThreads >= HighThreadThreshold) ? mShortIdleTimeout : mLongIdleTimeout;
epoch = PR_IntervalNow();
while (!mShutdown) {
// remove next record from Q; hand over owning reference. Check high, then med, then low
#if TTL_AVAILABLE
#define SET_GET_TTL(var, val) \
(var)->mGetTtl = sGetTtlEnabled && (val)
#else
#define SET_GET_TTL(var, val)
#endif
if (!PR_CLIST_IS_EMPTY(&mHighQ)) {
DeQueue (mHighQ, result);
SET_GET_TTL(*result, false);
return true;
}
if (mActiveAnyThreadCount < HighThreadThreshold) {
if (!PR_CLIST_IS_EMPTY(&mMediumQ)) {
DeQueue (mMediumQ, result);
mActiveAnyThreadCount++;
(*result)->usingAnyThread = true;
SET_GET_TTL(*result, true);
return true;
}
if (!PR_CLIST_IS_EMPTY(&mLowQ)) {
DeQueue (mLowQ, result);
mActiveAnyThreadCount++;
(*result)->usingAnyThread = true;
SET_GET_TTL(*result, true);
return true;
}
}
// Determining timeout is racy, so allow one cycle through checking the queues
// before exiting.
if (timedOut)
break;
// wait for one or more of the following to occur:
// (1) the pending queue has a host record to process
// (2) the shutdown flag has been set
// (3) the thread has been idle for too long
mNumIdleThreads++;
mIdleThreadCV.Wait(timeout);
mNumIdleThreads--;
now = PR_IntervalNow();
if ((PRIntervalTime)(now - epoch) >= timeout)
timedOut = true;
else {
// It is possible that PR_WaitCondVar() was interrupted and returned early,
// in which case we will loop back and re-enter it. In that case we want to
// do so with the new timeout reduced to reflect time already spent waiting.
timeout -= (PRIntervalTime)(now - epoch);
epoch = now;
}
}
// tell thread to exit...
return false;
}
void
nsHostResolver::PrepareRecordExpiration(nsHostRecord* rec) const
{
MOZ_ASSERT(((bool)rec->addr_info) != rec->negative);
if (!rec->addr_info) {
rec->SetExpiration(TimeStamp::NowLoRes(),
NEGATIVE_RECORD_LIFETIME, 0);
LOG(("Caching host [%s%s%s] negative record for %u seconds.\n",
LOG_HOST(rec->host, rec->netInterface),
NEGATIVE_RECORD_LIFETIME));
return;
}
unsigned int lifetime = mDefaultCacheLifetime;
unsigned int grace = mDefaultGracePeriod;
#if TTL_AVAILABLE
unsigned int ttl = mDefaultCacheLifetime;
if (sGetTtlEnabled) {
MutexAutoLock lock(rec->addr_info_lock);
if (rec->addr_info && rec->addr_info->ttl != AddrInfo::NO_TTL_DATA) {
ttl = rec->addr_info->ttl;
}
lifetime = ttl;
grace = 0;
}
#endif
rec->SetExpiration(TimeStamp::NowLoRes(), lifetime, grace);
LOG(("Caching host [%s%s%s] record for %u seconds (grace %d).",
LOG_HOST(rec->host, rec->netInterface), lifetime, grace));
}
//
// OnLookupComplete() checks if the resolving should be redone and if so it
// returns LOOKUP_RESOLVEAGAIN, but only if 'status' is not NS_ERROR_ABORT.
//
nsHostResolver::LookupStatus
nsHostResolver::OnLookupComplete(nsHostRecord* rec, nsresult status, AddrInfo* result)
{
// get the list of pending callbacks for this lookup, and notify
// them that the lookup is complete.
PRCList cbs;
PR_INIT_CLIST(&cbs);
{
MutexAutoLock lock(mLock);
if (rec->mResolveAgain && (status != NS_ERROR_ABORT)) {
rec->mResolveAgain = false;
return LOOKUP_RESOLVEAGAIN;
}
// grab list of callbacks to notify
MoveCList(rec->callbacks, cbs);
// update record fields. We might have a rec->addr_info already if a
// previous lookup result expired and we're reresolving it..
AddrInfo *old_addr_info;
{
MutexAutoLock lock(rec->addr_info_lock);
old_addr_info = rec->addr_info;
rec->addr_info = result;
rec->addr_info_gencnt++;
}
delete old_addr_info;
rec->negative = !rec->addr_info;
PrepareRecordExpiration(rec);
rec->resolving = false;
if (rec->usingAnyThread) {
mActiveAnyThreadCount--;
rec->usingAnyThread = false;
}
if (!mShutdown) {
// add to mEvictionQ
PR_APPEND_LINK(rec, &mEvictionQ);
NS_ADDREF(rec);
if (mEvictionQSize < mMaxCacheEntries)
mEvictionQSize++;
else {
// remove first element on mEvictionQ
nsHostRecord *head =
static_cast<nsHostRecord *>(PR_LIST_HEAD(&mEvictionQ));
PR_REMOVE_AND_INIT_LINK(head);
mDB.Remove((nsHostKey *) head);
if (!head->negative) {
// record the age of the entry upon eviction.
TimeDuration age = TimeStamp::NowLoRes() - head->mValidStart;
Telemetry::Accumulate(Telemetry::DNS_CLEANUP_AGE,
static_cast<uint32_t>(age.ToSeconds() / 60));
}
// release reference to rec owned by mEvictionQ
NS_RELEASE(head);
}
#if TTL_AVAILABLE
if (!rec->mGetTtl && !rec->resolving && sGetTtlEnabled) {
LOG(("Issuing second async lookup for TTL for host [%s%s%s].",
LOG_HOST(rec->host, rec->netInterface)));
rec->flags =
(rec->flags & ~RES_PRIORITY_MEDIUM) | RES_PRIORITY_LOW;
DebugOnly<nsresult> rv = IssueLookup(rec);
NS_WARN_IF_FALSE(NS_SUCCEEDED(rv),
"Could not issue second async lookup for TTL.");
}
#endif
}
}
if (!PR_CLIST_IS_EMPTY(&cbs)) {
PRCList *node = cbs.next;
while (node != &cbs) {
nsResolveHostCallback *callback =
static_cast<nsResolveHostCallback *>(node);
node = node->next;
callback->OnLookupComplete(this, rec, status);
// NOTE: callback must not be dereferenced after this point!!
}
}
NS_RELEASE(rec);
return LOOKUP_OK;
}
void
nsHostResolver::CancelAsyncRequest(const char *host,
uint16_t flags,
uint16_t af,
const char *netInterface,
nsIDNSListener *aListener,
nsresult status)
{
MutexAutoLock lock(mLock);
// Lookup the host record associated with host, flags & address family
nsHostKey key = { host, flags, af, netInterface };
auto he = static_cast<nsHostDBEnt*>(mDB.Search(&key));
if (he) {
nsHostRecord* recPtr = nullptr;
PRCList *node = he->rec->callbacks.next;
// Remove the first nsDNSAsyncRequest callback which matches the
// supplied listener object
while (node != &he->rec->callbacks) {
nsResolveHostCallback *callback
= static_cast<nsResolveHostCallback *>(node);
if (callback && (callback->EqualsAsyncListener(aListener))) {
// Remove from the list of callbacks
PR_REMOVE_LINK(callback);
recPtr = he->rec;
callback->OnLookupComplete(this, recPtr, status);
break;
}
node = node->next;
}
// If there are no more callbacks, remove the hash table entry
if (recPtr && PR_CLIST_IS_EMPTY(&recPtr->callbacks)) {
mDB.Remove((nsHostKey *)recPtr);
// If record is on a Queue, remove it and then deref it
if (recPtr->next != recPtr) {
PR_REMOVE_LINK(recPtr);
NS_RELEASE(recPtr);
}
}
}
}
size_t
nsHostResolver::SizeOfIncludingThis(MallocSizeOf mallocSizeOf) const
{
MutexAutoLock lock(mLock);
size_t n = mallocSizeOf(this);
n += mDB.ShallowSizeOfExcludingThis(mallocSizeOf);
for (auto iter = mDB.ConstIter(); !iter.Done(); iter.Next()) {
auto entry = static_cast<nsHostDBEnt*>(iter.Get());
n += entry->rec->SizeOfIncludingThis(mallocSizeOf);
}
// The following fields aren't measured.
// - mHighQ, mMediumQ, mLowQ, mEvictionQ, because they just point to
// nsHostRecords that also pointed to by entries |mDB|, and measured when
// |mDB| is measured.
return n;
}
void
nsHostResolver::ThreadFunc(void *arg)
{
LOG(("DNS lookup thread - starting execution.\n"));
static nsThreadPoolNaming naming;
naming.SetThreadPoolName(NS_LITERAL_CSTRING("DNS Resolver"));
#if defined(RES_RETRY_ON_FAILURE)
nsResState rs;
#endif
nsHostResolver *resolver = (nsHostResolver *)arg;
nsHostRecord *rec = nullptr;
AddrInfo *ai = nullptr;
while (rec || resolver->GetHostToLookup(&rec)) {
LOG(("DNS lookup thread - Calling getaddrinfo for host [%s%s%s].\n",
LOG_HOST(rec->host, rec->netInterface)));
TimeStamp startTime = TimeStamp::Now();
#if TTL_AVAILABLE
bool getTtl = rec->mGetTtl;
#else
bool getTtl = false;
#endif
nsresult status = GetAddrInfo(rec->host, rec->af, rec->flags, rec->netInterface,
&ai, getTtl);
#if defined(RES_RETRY_ON_FAILURE)
if (NS_FAILED(status) && rs.Reset()) {
status = GetAddrInfo(rec->host, rec->af, rec->flags, rec->netInterface, &ai,
getTtl);
}
#endif
{ // obtain lock to check shutdown and manage inter-module telemetry
MutexAutoLock lock(resolver->mLock);
if (!resolver->mShutdown) {
TimeDuration elapsed = TimeStamp::Now() - startTime;
uint32_t millis = static_cast<uint32_t>(elapsed.ToMilliseconds());
if (NS_SUCCEEDED(status)) {
Telemetry::ID histogramID;
if (!rec->addr_info_gencnt) {
// Time for initial lookup.
histogramID = Telemetry::DNS_LOOKUP_TIME;
} else if (!getTtl) {
// Time for renewal; categorized by expiration strategy.
histogramID = Telemetry::DNS_RENEWAL_TIME;
} else {
// Time to get TTL; categorized by expiration strategy.
histogramID = Telemetry::DNS_RENEWAL_TIME_FOR_TTL;
}
Telemetry::Accumulate(histogramID, millis);
} else {
Telemetry::Accumulate(Telemetry::DNS_FAILED_LOOKUP_TIME, millis);
}
}
}
// OnLookupComplete may release "rec", long before we lose it.
LOG(("DNS lookup thread - lookup completed for host [%s%s%s]: %s.\n",
LOG_HOST(rec->host, rec->netInterface),
ai ? "success" : "failure: unknown host"));
if (LOOKUP_RESOLVEAGAIN == resolver->OnLookupComplete(rec, status, ai)) {
// leave 'rec' assigned and loop to make a renewed host resolve
LOG(("DNS lookup thread - Re-resolving host [%s%s%s].\n",
LOG_HOST(rec->host, rec->netInterface)));
} else {
rec = nullptr;
}
}
resolver->mThreadCount--;
NS_RELEASE(resolver);
LOG(("DNS lookup thread - queue empty, thread finished.\n"));
}
nsresult
nsHostResolver::Create(uint32_t maxCacheEntries,
uint32_t defaultCacheEntryLifetime,
uint32_t defaultGracePeriod,
nsHostResolver **result)
{
nsHostResolver *res = new nsHostResolver(maxCacheEntries, defaultCacheEntryLifetime,
defaultGracePeriod);
NS_ADDREF(res);
nsresult rv = res->Init();
if (NS_FAILED(rv))
NS_RELEASE(res);
*result = res;
return rv;
}
void
nsHostResolver::GetDNSCacheEntries(nsTArray<DNSCacheEntries> *args)
{
for (auto iter = mDB.Iter(); !iter.Done(); iter.Next()) {
// We don't pay attention to address literals, only resolved domains.
// Also require a host.
auto entry = static_cast<nsHostDBEnt*>(iter.Get());
nsHostRecord* rec = entry->rec;
MOZ_ASSERT(rec, "rec should never be null here!");
if (!rec || !rec->addr_info || !rec->host) {
continue;
}
DNSCacheEntries info;
info.hostname = rec->host;
info.family = rec->af;
info.netInterface = rec->netInterface;
info.expiration =
(int64_t)(rec->mValidEnd - TimeStamp::NowLoRes()).ToSeconds();
if (info.expiration <= 0) {
// We only need valid DNS cache entries
continue;
}
{
MutexAutoLock lock(rec->addr_info_lock);
NetAddr *addr = nullptr;
NetAddrElement *addrElement = rec->addr_info->mAddresses.getFirst();
if (addrElement) {
addr = &addrElement->mAddress;
}
while (addr) {
char buf[kIPv6CStrBufSize];
if (NetAddrToString(addr, buf, sizeof(buf))) {
info.hostaddr.AppendElement(buf);
}
addr = nullptr;
addrElement = addrElement->getNext();
if (addrElement) {
addr = &addrElement->mAddress;
}
}
}
args->AppendElement(info);
}
}
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