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rtems-libbsd/mDNSResponder/mDNSMacOSX/daemon.c
Sebastian Huber dac4628cd0 mDNSResponder: Update to v878.270.2 
The sources can be obtained via:

https://opensource.apple.com/tarballs/mDNSResponder/mDNSResponder-878.270.2.tar.gz

Update #4010.
2020-06-23 18:17:22 +02:00

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/* -*- Mode: C; tab-width: 4 -*-
*
* Copyright (c) 2002-2015 Apple Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <mach/mach.h>
#include <mach/mach_error.h>
#include <sys/types.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <paths.h>
#include <fcntl.h>
#include <launch.h>
#include <launch_priv.h> // for launch_socket_service_check_in()
#include <pwd.h>
#include <sys/event.h>
#include <pthread.h>
#include <sandbox.h>
#include <SystemConfiguration/SCDynamicStoreCopyDHCPInfo.h>
#include <err.h>
#include <sysexits.h>
#ifdef UNIT_TEST
#include "unittest.h"
#endif
#include "uDNS.h"
#include "DNSCommon.h"
#include "mDNSMacOSX.h" // Defines the specific types needed to run mDNS on this platform
#include "uds_daemon.h" // Interface to the server side implementation of dns_sd.h
#include "xpc_services.h" // Interface to XPC services
#include "helper.h"
#if AWD_METRICS
#include "Metrics.h"
#endif
#if APPLE_OSX_mDNSResponder
static os_log_t log_general = NULL;
#endif
// Used on OSX(10.11.x onwards) for manipulating mDNSResponder program arguments
#if APPLE_OSX_mDNSResponder
// plist file to read the user's preferences
#define kProgramArguments CFSTR("com.apple.mDNSResponder")
// possible arguments for external customers
#define kPreferencesKey_DebugLogging CFSTR("DebugLogging")
#define kPreferencesKey_UnicastPacketLogging CFSTR("UnicastPacketLogging")
#define kPreferencesKey_AlwaysAppendSearchDomains CFSTR("AlwaysAppendSearchDomains")
#define kPreferencesKey_EnableAllowExpired CFSTR("EnableAllowExpired")
#define kPreferencesKey_NoMulticastAdvertisements CFSTR("NoMulticastAdvertisements")
#define kPreferencesKey_StrictUnicastOrdering CFSTR("StrictUnicastOrdering")
#define kPreferencesKey_OfferSleepProxyService CFSTR("OfferSleepProxyService")
#define kPreferencesKey_UseInternalSleepProxy CFSTR("UseInternalSleepProxy")
#if ENABLE_BLE_TRIGGERED_BONJOUR
#define kPreferencesKey_EnableBLEBasedDiscovery CFSTR("EnableBLEBasedDiscovery")
#define kPreferencesKey_DefaultToBLETriggered CFSTR("DefaultToBLETriggered")
#endif // ENABLE_BLE_TRIGGERED_BONJOUR
#if TARGET_OS_IPHONE
#define kPreferencesKey_PreallocateCacheMemory CFSTR("PreallocateCacheMemory")
#endif
#endif
//*************************************************************************************************************
#if COMPILER_LIKES_PRAGMA_MARK
#pragma mark - Globals
#endif
static mDNS_PlatformSupport PlatformStorage;
// Start off with a default cache of 32K (136 records of 240 bytes each)
// Each time we grow the cache we add another 136 records
// 136 * 240 = 32640 bytes.
// This fits in eight 4kB pages, with 128 bytes spare for memory block headers and similar overhead
#define RR_CACHE_SIZE ((32*1024) / sizeof(CacheRecord))
static CacheEntity rrcachestorage[RR_CACHE_SIZE];
struct CompileTimeAssertionChecks_RR_CACHE_SIZE { char a[(RR_CACHE_SIZE >= 136) ? 1 : -1]; };
#define kRRCacheGrowSize (sizeof(CacheEntity) * RR_CACHE_SIZE)
#ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
mDNSlocal void PrepareForIdle(void *m_param);
#else // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
static mach_port_t signal_port = MACH_PORT_NULL;
#endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
static dnssd_sock_t *launchd_fds = mDNSNULL;
static size_t launchd_fds_count = 0;
static mDNSBool NoMulticastAdvertisements = mDNSfalse; // By default, advertise addresses (& other records) via multicast
extern mDNSBool StrictUnicastOrdering;
extern mDNSBool AlwaysAppendSearchDomains;
extern mDNSBool EnableAllowExpired;
#if ENABLE_BLE_TRIGGERED_BONJOUR
extern mDNSBool EnableBLEBasedDiscovery;
extern mDNSBool DefaultToBLETriggered;
#endif // ENABLE_BLE_TRIGGERED_BONJOUR
#if TARGET_OS_IPHONE
static mDNSBool PreallocateCacheMemory = mDNSfalse;
#define kRRCacheMemoryLimit 1000000 // For now, we limit the cache to at most 1MB on iOS devices.
#endif
// We keep a list of client-supplied event sources in KQSocketEventSource records
typedef struct KQSocketEventSource
{
struct KQSocketEventSource *next;
int fd;
KQueueEntry kqs;
udsEventCallback callback;
void *context;
} KQSocketEventSource;
static KQSocketEventSource *gEventSources;
//*************************************************************************************************************
#if COMPILER_LIKES_PRAGMA_MARK
#pragma mark -
#pragma mark - General Utility Functions
#endif
#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING
char _malloc_options[] = "AXZ";
mDNSlocal void validatelists(mDNS *const m)
{
#if BONJOUR_ON_DEMAND
mDNSu32 NumAllInterfaceRecords = 0;
mDNSu32 NumAllInterfaceQuestions = 0;
#endif // BONJOUR_ON_DEMAND
// Check local lists
KQSocketEventSource *k;
for (k = gEventSources; k; k=k->next)
if (k->next == (KQSocketEventSource *)~0 || k->fd < 0)
LogMemCorruption("gEventSources: %p is garbage (%d)", k, k->fd);
// Check Unix Domain Socket client lists (uds_daemon.c)
uds_validatelists();
// Check core mDNS lists
AuthRecord *rr;
for (rr = m->ResourceRecords; rr; rr=rr->next)
{
if (rr->next == (AuthRecord *)~0 || rr->resrec.RecordType == 0 || rr->resrec.RecordType == 0xFF)
LogMemCorruption("ResourceRecords list: %p is garbage (%X)", rr, rr->resrec.RecordType);
if (rr->resrec.name != &rr->namestorage)
LogMemCorruption("ResourceRecords list: %p name %p does not point to namestorage %p %##s",
rr, rr->resrec.name->c, rr->namestorage.c, rr->namestorage.c);
#if BONJOUR_ON_DEMAND
if (!AuthRecord_uDNS(rr) && !RRLocalOnly(rr)) NumAllInterfaceRecords++;
#endif // BONJOUR_ON_DEMAND
}
for (rr = m->DuplicateRecords; rr; rr=rr->next)
{
if (rr->next == (AuthRecord *)~0 || rr->resrec.RecordType == 0 || rr->resrec.RecordType == 0xFF)
LogMemCorruption("DuplicateRecords list: %p is garbage (%X)", rr, rr->resrec.RecordType);
#if BONJOUR_ON_DEMAND
if (!AuthRecord_uDNS(rr) && !RRLocalOnly(rr)) NumAllInterfaceRecords++;
#endif // BONJOUR_ON_DEMAND
}
rr = m->NewLocalRecords;
if (rr)
if (rr->next == (AuthRecord *)~0 || rr->resrec.RecordType == 0 || rr->resrec.RecordType == 0xFF)
LogMemCorruption("NewLocalRecords: %p is garbage (%X)", rr, rr->resrec.RecordType);
rr = m->CurrentRecord;
if (rr)
if (rr->next == (AuthRecord *)~0 || rr->resrec.RecordType == 0 || rr->resrec.RecordType == 0xFF)
LogMemCorruption("CurrentRecord: %p is garbage (%X)", rr, rr->resrec.RecordType);
DNSQuestion *q;
for (q = m->Questions; q; q=q->next)
{
if (q->next == (DNSQuestion*)~0 || q->ThisQInterval == (mDNSs32) ~0)
LogMemCorruption("Questions list: %p is garbage (%lX %p)", q, q->ThisQInterval, q->next);
if (q->DuplicateOf && q->LocalSocket)
LogMemCorruption("Questions list: Duplicate Question %p should not have LocalSocket set %##s (%s)", q, q->qname.c, DNSTypeName(q->qtype));
#if BONJOUR_ON_DEMAND
if (!LocalOnlyOrP2PInterface(q->InterfaceID) && mDNSOpaque16IsZero(q->TargetQID))
NumAllInterfaceQuestions++;
#endif // BONJOUR_ON_DEMAND
}
CacheGroup *cg;
CacheRecord *cr;
mDNSu32 slot;
FORALL_CACHERECORDS(slot, cg, cr)
{
if (cr->resrec.RecordType == 0 || cr->resrec.RecordType == 0xFF)
LogMemCorruption("Cache slot %lu: %p is garbage (%X)", slot, cr, cr->resrec.RecordType);
if (cr->CRActiveQuestion)
{
for (q = m->Questions; q; q=q->next) if (q == cr->CRActiveQuestion) break;
if (!q) LogMemCorruption("Cache slot %lu: CRActiveQuestion %p not in m->Questions list %s", slot, cr->CRActiveQuestion, CRDisplayString(m, cr));
}
}
// Check core uDNS lists
udns_validatelists(m);
// Check platform-layer lists
NetworkInterfaceInfoOSX *i;
for (i = m->p->InterfaceList; i; i = i->next)
if (i->next == (NetworkInterfaceInfoOSX *)~0 || !i->m || i->m == (mDNS *)~0)
LogMemCorruption("m->p->InterfaceList: %p is garbage (%p)", i, i->ifinfo.ifname);
ClientTunnel *t;
for (t = m->TunnelClients; t; t=t->next)
if (t->next == (ClientTunnel *)~0 || t->dstname.c[0] > 63)
LogMemCorruption("m->TunnelClients: %p is garbage (%d)", t, t->dstname.c[0]);
#if BONJOUR_ON_DEMAND
if (m->NumAllInterfaceRecords != NumAllInterfaceRecords)
LogMemCorruption("NumAllInterfaceRecords is %d should be %d", m->NumAllInterfaceRecords, NumAllInterfaceRecords);
if (m->NumAllInterfaceQuestions != NumAllInterfaceQuestions)
LogMemCorruption("NumAllInterfaceQuestions is %d should be %d", m->NumAllInterfaceQuestions, NumAllInterfaceQuestions);
#endif // BONJOUR_ON_DEMAND
}
mDNSexport void *mallocL(char *msg, unsigned int size)
{
// Allocate space for two words of sanity checking data before the requested block
mDNSu32 *mem = malloc(sizeof(mDNSu32) * 2 + size);
if (!mem)
{ LogMsg("malloc( %s : %d ) failed", msg, size); return(NULL); }
else
{
if (size > 32768) LogMsg("malloc( %s : %lu ) @ %p suspiciously large", msg, size, &mem[2]);
else if (MACOSX_MDNS_MALLOC_DEBUGGING >= 2) LogMsg("malloc( %s : %lu ) @ %p", msg, size, &mem[2]);
mem[0] = 0xDEAD1234;
mem[1] = size;
//mDNSPlatformMemZero(&mem[2], size);
memset(&mem[2], 0xFF, size);
validatelists(&mDNSStorage);
return(&mem[2]);
}
}
mDNSexport void freeL(char *msg, void *x)
{
if (!x)
LogMsg("free( %s @ NULL )!", msg);
else
{
mDNSu32 *mem = ((mDNSu32 *)x) - 2;
if (mem[0] == 0xDEADDEAD) { LogMemCorruption("free( %s : %lu @ %p ) !!!! ALREADY DISPOSED !!!!", msg, mem[1], &mem[2]); return; }
if (mem[0] != 0xDEAD1234) { LogMemCorruption("free( %s : %lu @ %p ) !!!! NEVER ALLOCATED !!!!", msg, mem[1], &mem[2]); return; }
if (mem[1] > 32768) LogMsg("free( %s : %lu @ %p) suspiciously large", msg, mem[1], &mem[2]);
else if (MACOSX_MDNS_MALLOC_DEBUGGING >= 2) LogMsg("free( %s : %ld @ %p)", msg, mem[1], &mem[2]);
mem[0] = 0xDEADDEAD;
memset(mem+2, 0xFF, mem[1]);
validatelists(&mDNSStorage);
free(mem);
}
}
#endif
//*************************************************************************************************************
// Registration
mDNSexport void RecordUpdatedNiceLabel(mDNSs32 delay)
{
mDNSStorage.p->NotifyUser = NonZeroTime(mDNSStorage.timenow + delay);
}
mDNSlocal void mDNSPreferencesSetNames(int key, domainlabel *old, domainlabel *new)
{
mDNS *const m = &mDNSStorage;
domainlabel *prevold, *prevnew;
switch (key)
{
case kmDNSComputerName:
case kmDNSLocalHostName:
if (key == kmDNSComputerName)
{
prevold = &m->p->prevoldnicelabel;
prevnew = &m->p->prevnewnicelabel;
}
else
{
prevold = &m->p->prevoldhostlabel;
prevnew = &m->p->prevnewhostlabel;
}
// There are a few cases where we need to invoke the helper.
//
// 1. If the "old" label and "new" label are not same, it means there is a conflict. We need
// to invoke the helper so that it pops up a dialogue to inform the user about the
// conflict
//
// 2. If the "old" label and "new" label are same, it means the user has set the host/nice label
// through the preferences pane. We may have to inform the helper as it may have popped up
// a dialogue previously (due to a conflict) and it needs to suppress it now. We can avoid invoking
// the helper in this case if the previous values (old and new) that we told helper last time
// are same. If the previous old and new values are same, helper does not care.
//
// Note: "new" can be NULL when we have repeated conflicts and we are asking helper to give up. "old"
// is not called with NULL today, but this makes it future proof.
if (!old || !new || !SameDomainLabelCS(old->c, new->c) ||
!SameDomainLabelCS(old->c, prevold->c) ||
!SameDomainLabelCS(new->c, prevnew->c))
{
// Work around bug radar:21397654
#ifndef __clang_analyzer__
if (old)
*prevold = *old;
else
prevold->c[0] = 0;
if (new)
*prevnew = *new;
else
prevnew->c[0] = 0;
#endif
mDNSPreferencesSetName(key, old, new);
}
else
{
LogInfo("mDNSPreferencesSetNames not invoking helper %s %#s, %s %#s, old %#s, new %#s",
(key == kmDNSComputerName ? "prevoldnicelabel" : "prevoldhostlabel"), prevold->c,
(key == kmDNSComputerName ? "prevnewnicelabel" : "prevnewhostlabel"), prevnew->c,
old->c, new->c);
}
break;
default:
LogMsg("mDNSPreferencesSetNames: unrecognized key: %d", key);
return;
}
}
mDNSlocal void mDNS_StatusCallback(mDNS *const m, mStatus result)
{
if (result == mStatus_NoError)
{
if (!SameDomainLabelCS(m->p->userhostlabel.c, m->hostlabel.c))
LogInfo("Local Hostname changed from \"%#s.local\" to \"%#s.local\"", m->p->userhostlabel.c, m->hostlabel.c);
// One second pause in case we get a Computer Name update too -- don't want to alert the user twice
RecordUpdatedNiceLabel(mDNSPlatformOneSecond);
}
else if (result == mStatus_NameConflict)
{
LogInfo("Local Hostname conflict for \"%#s.local\"", m->hostlabel.c);
if (!m->p->HostNameConflict) m->p->HostNameConflict = NonZeroTime(m->timenow);
else if (m->timenow - m->p->HostNameConflict > 60 * mDNSPlatformOneSecond)
{
// Tell the helper we've given up
mDNSPreferencesSetNames(kmDNSLocalHostName, &m->p->userhostlabel, NULL);
}
}
else if (result == mStatus_GrowCache)
{
// Allocate another chunk of cache storage
static unsigned int allocated = 0;
#if TARGET_OS_IPHONE
if (allocated >= kRRCacheMemoryLimit) return; // For now we limit the cache to at most 1MB on iOS devices
#endif
allocated += kRRCacheGrowSize;
// LogMsg("GrowCache %d * %d = %d; total so far %6u", sizeof(CacheEntity), RR_CACHE_SIZE, sizeof(CacheEntity) * RR_CACHE_SIZE, allocated);
CacheEntity *storage = mallocL("mStatus_GrowCache", sizeof(CacheEntity) * RR_CACHE_SIZE);
//LogInfo("GrowCache %d * %d = %d", sizeof(CacheEntity), RR_CACHE_SIZE, sizeof(CacheEntity) * RR_CACHE_SIZE);
if (storage) mDNS_GrowCache(m, storage, RR_CACHE_SIZE);
}
else if (result == mStatus_ConfigChanged)
{
// Tell the helper we've seen a change in the labels. It will dismiss the name conflict alert if needed.
mDNSPreferencesSetNames(kmDNSComputerName, &m->p->usernicelabel, &m->nicelabel);
mDNSPreferencesSetNames(kmDNSLocalHostName, &m->p->userhostlabel, &m->hostlabel);
// Then we call into the UDS daemon code, to let it do the same
udsserver_handle_configchange(m);
}
}
//*************************************************************************************************************
#if COMPILER_LIKES_PRAGMA_MARK
#pragma mark -
#pragma mark - Startup, shutdown, and supporting code
#endif
mDNSlocal void ExitCallback(int sig)
{
(void)sig; // Unused
LogMsg("%s stopping", mDNSResponderVersionString);
if (udsserver_exit() < 0)
LogMsg("ExitCallback: udsserver_exit failed");
debugf("ExitCallback: mDNS_StartExit");
mDNS_StartExit(&mDNSStorage);
}
#ifndef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
// Send a mach_msg to ourselves (since that is signal safe) telling us to cleanup and exit
mDNSlocal void HandleSIG(int sig)
{
kern_return_t status;
mach_msg_header_t header;
// WARNING: can't call syslog or fprintf from signal handler
header.msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_MAKE_SEND, 0);
header.msgh_remote_port = signal_port;
header.msgh_local_port = MACH_PORT_NULL;
header.msgh_size = sizeof(header);
header.msgh_id = sig;
status = mach_msg(&header, MACH_SEND_MSG | MACH_SEND_TIMEOUT, header.msgh_size,
0, MACH_PORT_NULL, 0, MACH_PORT_NULL);
if (status != MACH_MSG_SUCCESS)
{
if (status == MACH_SEND_TIMED_OUT) mach_msg_destroy(&header);
if (sig == SIGTERM || sig == SIGINT) exit(-1);
}
}
#endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
mDNSexport void INFOCallback(void)
{
mDNSs32 utc = mDNSPlatformUTC();
const mDNSs32 now = mDNS_TimeNow(&mDNSStorage);
NetworkInterfaceInfoOSX *i;
DNSServer *s;
McastResolver *mr;
LogMsg("---- BEGIN STATE LOG ---- %s %s %d", mDNSResponderVersionString, OSXVers ? "OSXVers" : "iOSVers", OSXVers ? OSXVers : iOSVers);
udsserver_info();
LogMsgNoIdent("----- Platform Timers -----");
LogTimer("m->NextCacheCheck ", mDNSStorage.NextCacheCheck);
LogTimer("m->NetworkChanged ", mDNSStorage.NetworkChanged);
LogTimer("m->p->NotifyUser ", mDNSStorage.p->NotifyUser);
LogTimer("m->p->HostNameConflict ", mDNSStorage.p->HostNameConflict);
LogTimer("m->p->KeyChainTimer ", mDNSStorage.p->KeyChainTimer);
xpcserver_info(&mDNSStorage);
LogMsgNoIdent("----- KQSocketEventSources -----");
if (!gEventSources) LogMsgNoIdent("<None>");
else
{
KQSocketEventSource *k;
for (k = gEventSources; k; k=k->next)
LogMsgNoIdent("%3d %s %s", k->fd, k->kqs.KQtask, k->fd == mDNSStorage.uds_listener_skt ? "Listener for incoming UDS clients" : " ");
}
LogMsgNoIdent("------ Network Interfaces ------");
if (!mDNSStorage.p->InterfaceList) LogMsgNoIdent("<None>");
else
{
LogMsgNoIdent(" Struct addr Registered MAC BSSID Interface Address");
for (i = mDNSStorage.p->InterfaceList; i; i = i->next)
{
// Allow six characters for interface name, for names like "vmnet8"
if (!i->Exists)
LogMsgNoIdent("%p %2ld, %p, %s %-6s %.6a %.6a %#-14a dormant for %d seconds",
i, i->ifinfo.InterfaceID, i->Registered,
i->sa_family == AF_INET ? "v4" : i->sa_family == AF_INET6 ? "v6" : "??", i->ifinfo.ifname, &i->ifinfo.MAC, &i->BSSID,
&i->ifinfo.ip, utc - i->LastSeen);
else
{
const CacheRecord *sps[3];
FindSPSInCache(&mDNSStorage, &i->ifinfo.NetWakeBrowse, sps);
LogMsgNoIdent("%p %2ld, %p, %s %-6s %.6a %.6a %s %s %s %s %s %s %#a",
i, i->ifinfo.InterfaceID, i->Registered,
i->sa_family == AF_INET ? "v4" : i->sa_family == AF_INET6 ? "v6" : "??", i->ifinfo.ifname, &i->ifinfo.MAC, &i->BSSID,
i->ifinfo.InterfaceActive ? "Active" : " ",
i->ifinfo.IPv4Available ? "v4" : " ",
i->ifinfo.IPv6Available ? "v6" : " ",
i->ifinfo.Advertise ? "A" : " ",
i->ifinfo.McastTxRx ? "M" : " ",
!(i->ifinfo.InterfaceActive && i->ifinfo.NetWake) ? " " : !sps[0] ? "p" : "P",
&i->ifinfo.ip);
// Only print the discovered sleep proxies once for the lead/active interface of an interface set.
if (i == i->Registered && (sps[0] || sps[1] || sps[2]))
{
LogMsgNoIdent(" Sleep Proxy Metric Name");
if (sps[0]) LogMsgNoIdent(" %13d %#s", SPSMetric(sps[0]->resrec.rdata->u.name.c), sps[0]->resrec.rdata->u.name.c);
if (sps[1]) LogMsgNoIdent(" %13d %#s", SPSMetric(sps[1]->resrec.rdata->u.name.c), sps[1]->resrec.rdata->u.name.c);
if (sps[2]) LogMsgNoIdent(" %13d %#s", SPSMetric(sps[2]->resrec.rdata->u.name.c), sps[2]->resrec.rdata->u.name.c);
}
}
}
}
LogMsgNoIdent("--------- DNS Servers(%d) ----------", NumUnicastDNSServers);
if (!mDNSStorage.DNSServers) LogMsgNoIdent("<None>");
else
{
for (s = mDNSStorage.DNSServers; s; s = s->next)
{
NetworkInterfaceInfoOSX *ifx = IfindexToInterfaceInfoOSX(s->interface);
LogMsgNoIdent("DNS Server %##s %s%s%#a:%d %d %s %d %u %s %s %s %s %s %s",
s->domain.c, ifx ? ifx->ifinfo.ifname : "", ifx ? " " : "", &s->addr, mDNSVal16(s->port),
s->penaltyTime ? (s->penaltyTime - mDNS_TimeNow(&mDNSStorage)) : 0, DNSScopeToString(s->scopeType),
s->timeout, s->resGroupID,
s->req_A ? "v4" : "!v4",
s->req_AAAA ? "v6" : "!v6",
s->isCell ? "cell" : "!cell",
s->isExpensive ? "exp" : "!exp",
s->isCLAT46 ? "clat46" : "!clat46",
s->DNSSECAware ? "DNSSECAware" : "!DNSSECAware");
}
}
LogMsgNoIdent("v4answers %d", mDNSStorage.p->v4answers);
LogMsgNoIdent("v6answers %d", mDNSStorage.p->v6answers);
LogMsgNoIdent("Last DNS Trigger: %d ms ago", (now - mDNSStorage.p->DNSTrigger));
LogMsgNoIdent("--------- Mcast Resolvers ----------");
if (!mDNSStorage.McastResolvers) LogMsgNoIdent("<None>");
else
{
for (mr = mDNSStorage.McastResolvers; mr; mr = mr->next)
LogMsgNoIdent("Mcast Resolver %##s timeout %u", mr->domain.c, mr->timeout);
}
LogMsgNoIdent("------------ Hostnames -------------");
if (!mDNSStorage.Hostnames) LogMsgNoIdent("<None>");
else
{
HostnameInfo *hi;
for (hi = mDNSStorage.Hostnames; hi; hi = hi->next)
{
LogMsgNoIdent("%##s v4 %d %s", hi->fqdn.c, hi->arv4.state, ARDisplayString(&mDNSStorage, &hi->arv4));
LogMsgNoIdent("%##s v6 %d %s", hi->fqdn.c, hi->arv6.state, ARDisplayString(&mDNSStorage, &hi->arv6));
}
}
LogMsgNoIdent("--------------- FQDN ---------------");
if (!mDNSStorage.FQDN.c[0]) LogMsgNoIdent("<None>");
else
{
LogMsgNoIdent("%##s", mDNSStorage.FQDN.c);
}
#if AWD_METRICS
LogMetrics();
#endif
LogMsgNoIdent("Timenow 0x%08lX (%d)", (mDNSu32)now, now);
LogMsg("---- END STATE LOG ---- %s %s %d", mDNSResponderVersionString, OSXVers ? "OSXVers" : "iOSVers", OSXVers ? OSXVers : iOSVers);
}
mDNSexport void mDNSPlatformLogToFile(int log_level, const char *buffer)
{
if (!log_general)
os_log_error(OS_LOG_DEFAULT, "Could NOT create log handle in init_logging()");
else
os_log_with_type(log_general, log_level, "%{private}s", buffer);
}
// Writes the state out to the dynamic store and also affects the ASL filter level
mDNSexport void UpdateDebugState()
{
mDNSu32 one = 1;
mDNSu32 zero = 0;
CFMutableDictionaryRef dict = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
if (!dict)
{
LogMsg("UpdateDebugState: Could not create dict");
return;
}
CFNumberRef numOne = CFNumberCreate(NULL, kCFNumberSInt32Type, &one);
if (!numOne)
{
LogMsg("UpdateDebugState: Could not create CFNumber one");
return;
}
CFNumberRef numZero = CFNumberCreate(NULL, kCFNumberSInt32Type, &zero);
if (!numZero)
{
LogMsg("UpdateDebugState: Could not create CFNumber zero");
CFRelease(numOne);
return;
}
if (mDNS_LoggingEnabled)
CFDictionarySetValue(dict, CFSTR("VerboseLogging"), numOne);
else
CFDictionarySetValue(dict, CFSTR("VerboseLogging"), numZero);
if (mDNS_PacketLoggingEnabled)
CFDictionarySetValue(dict, CFSTR("PacketLogging"), numOne);
else
CFDictionarySetValue(dict, CFSTR("PacketLogging"), numZero);
if (mDNS_McastLoggingEnabled)
CFDictionarySetValue(dict, CFSTR("McastLogging"), numOne);
else
CFDictionarySetValue(dict, CFSTR("McastLogging"), numZero);
if (mDNS_McastTracingEnabled)
CFDictionarySetValue(dict, CFSTR("McastTracing"), numOne);
else
CFDictionarySetValue(dict, CFSTR("McastTracing"), numZero);
CFRelease(numOne);
CFRelease(numZero);
mDNSDynamicStoreSetConfig(kmDNSDebugState, mDNSNULL, dict);
CFRelease(dict);
}
#ifndef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
mDNSlocal void SignalCallback(CFMachPortRef port, void *msg, CFIndex size, void *info)
{
(void)port; // Unused
(void)size; // Unused
(void)info; // Unused
mach_msg_header_t *msg_header = (mach_msg_header_t *)msg;
mDNS *const m = &mDNSStorage;
// We're running on the CFRunLoop (Mach port) thread, not the kqueue thread, so we need to grab the KQueueLock before proceeding
KQueueLock();
switch(msg_header->msgh_id)
{
case SIGHUP: {
mDNSu32 slot;
CacheGroup *cg;
CacheRecord *rr;
LogMsg("SIGHUP: Purge cache");
mDNS_Lock(m);
FORALL_CACHERECORDS(slot, cg, rr)
{
rr->resrec.mortality = Mortality_Mortal;
mDNS_PurgeCacheResourceRecord(m, rr);
}
// Restart unicast and multicast queries
mDNSCoreRestartQueries(m);
mDNS_Unlock(m);
} break;
case SIGINT:
case SIGTERM: ExitCallback(msg_header->msgh_id); break;
case SIGINFO: INFOCallback(); break;
case SIGUSR1:
#if APPLE_OSX_mDNSResponder
mDNS_LoggingEnabled = 1;
LogMsg("SIGUSR1: Logging %s on Apple Platforms", mDNS_LoggingEnabled ? "Enabled" : "Disabled");
#else
mDNS_LoggingEnabled = mDNS_LoggingEnabled ? 0 : 1;
LogMsg("SIGUSR1: Logging %s", mDNS_LoggingEnabled ? "Enabled" : "Disabled");
#endif
WatchDogReportingThreshold = mDNS_LoggingEnabled ? 50 : 250;
UpdateDebugState();
LogInfo("USR1 Logging Enabled");
break;
case SIGUSR2:
#if APPLE_OSX_mDNSResponder
mDNS_PacketLoggingEnabled = 1;
LogMsg("SIGUSR2: Packet Logging %s on Apple Platforms", mDNS_PacketLoggingEnabled ? "Enabled" : "Disabled");
#else
mDNS_PacketLoggingEnabled = mDNS_PacketLoggingEnabled ? 0 : 1;
LogMsg("SIGUSR2: Packet Logging %s", mDNS_PacketLoggingEnabled ? "Enabled" : "Disabled");
#endif
mDNS_McastTracingEnabled = (mDNS_PacketLoggingEnabled && mDNS_McastLoggingEnabled) ? mDNStrue : mDNSfalse;
LogInfo("SIGUSR2: Multicast Tracing is %s", mDNS_McastTracingEnabled ? "Enabled" : "Disabled");
UpdateDebugState();
break;
case SIGPROF: mDNS_McastLoggingEnabled = mDNS_McastLoggingEnabled ? mDNSfalse : mDNStrue;
LogMsg("SIGPROF: Multicast Logging %s", mDNS_McastLoggingEnabled ? "Enabled" : "Disabled");
LogMcastStateInfo(mDNSfalse, mDNStrue, mDNStrue);
mDNS_McastTracingEnabled = (mDNS_PacketLoggingEnabled && mDNS_McastLoggingEnabled) ? mDNStrue : mDNSfalse;
LogMsg("SIGPROF: Multicast Tracing is %s", mDNS_McastTracingEnabled ? "Enabled" : "Disabled");
UpdateDebugState();
break;
case SIGTSTP: mDNS_LoggingEnabled = mDNS_PacketLoggingEnabled = mDNS_McastLoggingEnabled = mDNS_McastTracingEnabled = mDNSfalse;
LogMsg("All mDNSResponder Debug Logging/Tracing Disabled (USR1/USR2/PROF)");
UpdateDebugState();
break;
default: LogMsg("SignalCallback: Unknown signal %d", msg_header->msgh_id); break;
}
KQueueUnlock("Unix Signal");
}
// MachServerName is com.apple.mDNSResponder (Supported only till 10.9.x)
mDNSlocal kern_return_t mDNSDaemonInitialize(void)
{
mStatus err;
err = mDNS_Init(&mDNSStorage, &PlatformStorage,
rrcachestorage, RR_CACHE_SIZE,
!NoMulticastAdvertisements,
mDNS_StatusCallback, mDNS_Init_NoInitCallbackContext);
if (err)
{
LogMsg("Daemon start: mDNS_Init failed %d", err);
return(err);
}
#if TARGET_OS_IPHONE
if (PreallocateCacheMemory)
{
const int growCount = (kRRCacheMemoryLimit + kRRCacheGrowSize - 1) / kRRCacheGrowSize;
int i;
for (i = 0; i < growCount; ++i)
{
mDNS_StatusCallback(&mDNSStorage, mStatus_GrowCache);
}
}
#endif
CFMachPortRef i_port = CFMachPortCreate(NULL, SignalCallback, NULL, NULL);
CFRunLoopSourceRef i_rls = CFMachPortCreateRunLoopSource(NULL, i_port, 0);
signal_port = CFMachPortGetPort(i_port);
CFRunLoopAddSource(CFRunLoopGetMain(), i_rls, kCFRunLoopDefaultMode);
CFRelease(i_rls);
return(err);
}
#else // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
// SignalDispatch is mostly just a copy/paste of entire code block from SignalCallback above.
// The common code should be a subroutine, or we end up having to fix bugs in two places all the time.
// The same applies to mDNSDaemonInitialize, much of which is just a copy/paste of chunks
// of code from above. Alternatively we could remove the duplicated source code by having
// single routines, with the few differing parts bracketed with "#ifndef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM"
mDNSlocal void SignalDispatch(dispatch_source_t source)
{
int sig = (int)dispatch_source_get_handle(source);
mDNS *const m = &mDNSStorage;
KQueueLock();
switch(sig)
{
case SIGHUP: {
mDNSu32 slot;
CacheGroup *cg;
CacheRecord *rr;
LogMsg("SIGHUP: Purge cache");
mDNS_Lock(m);
FORALL_CACHERECORDS(slot, cg, rr)
{
rr->resrec.mortality = Mortality_Mortal;
mDNS_PurgeCacheResourceRecord(m, rr);
}
// Restart unicast and multicast queries
mDNSCoreRestartQueries(m);
mDNS_Unlock(m);
} break;
case SIGINT:
case SIGTERM: ExitCallback(sig); break;
case SIGINFO: INFOCallback(); break;
case SIGUSR1: mDNS_LoggingEnabled = mDNS_LoggingEnabled ? 0 : 1;
LogMsg("SIGUSR1: Logging %s", mDNS_LoggingEnabled ? "Enabled" : "Disabled");
WatchDogReportingThreshold = mDNS_LoggingEnabled ? 50 : 250;
UpdateDebugState();
break;
case SIGUSR2: mDNS_PacketLoggingEnabled = mDNS_PacketLoggingEnabled ? 0 : 1;
LogMsg("SIGUSR2: Packet Logging %s", mDNS_PacketLoggingEnabled ? "Enabled" : "Disabled");
UpdateDebugState();
break;
default: LogMsg("SignalCallback: Unknown signal %d", sig); break;
}
KQueueUnlock("Unix Signal");
}
mDNSlocal void mDNSSetupSignal(dispatch_queue_t queue, int sig)
{
signal(sig, SIG_IGN);
dispatch_source_t source = dispatch_source_create(DISPATCH_SOURCE_TYPE_SIGNAL, sig, 0, queue);
if (source)
{
dispatch_source_set_event_handler(source, ^{SignalDispatch(source);});
// Start processing signals
dispatch_resume(source);
}
else
{
LogMsg("mDNSSetupSignal: Cannot setup signal %d", sig);
}
}
mDNSlocal kern_return_t mDNSDaemonInitialize(void)
{
mStatus err;
dispatch_queue_t queue = dispatch_get_main_queue();
err = mDNS_Init(&mDNSStorage, &PlatformStorage,
rrcachestorage, RR_CACHE_SIZE,
!NoMulticastAdvertisements,
mDNS_StatusCallback, mDNS_Init_NoInitCallbackContext);
if (err)
{
LogMsg("Daemon start: mDNS_Init failed %d", err);
return(err);
}
mDNSSetupSignal(queue, SIGHUP);
mDNSSetupSignal(queue, SIGINT);
mDNSSetupSignal(queue, SIGTERM);
mDNSSetupSignal(queue, SIGINFO);
mDNSSetupSignal(queue, SIGUSR1);
mDNSSetupSignal(queue, SIGUSR2);
// Create a custom handler for doing the housekeeping work. This is either triggered
// by the timer or an event source
PlatformStorage.custom = dispatch_source_create(DISPATCH_SOURCE_TYPE_DATA_ADD, 0, 0, queue);
if (PlatformStorage.custom == mDNSNULL) {LogMsg("mDNSDaemonInitialize: Error creating custom source"); return -1;}
dispatch_source_set_event_handler(PlatformStorage.custom, ^{PrepareForIdle(&mDNSStorage);});
dispatch_resume(PlatformStorage.custom);
// Create a timer source to trigger housekeeping work. The houskeeping work itself
// is done in the custom handler that we set below.
PlatformStorage.timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
if (PlatformStorage.timer == mDNSNULL) {LogMsg("mDNSDaemonInitialize: Error creating timer source"); return -1;}
// As the API does not support one shot timers, we pass zero for the interval. In the custom handler, we
// always reset the time to the new time computed. In effect, we ignore the interval
dispatch_source_set_timer(PlatformStorage.timer, DISPATCH_TIME_NOW, 1000ull * 1000000000, 0);
dispatch_source_set_event_handler(PlatformStorage.timer, ^{
dispatch_source_merge_data(PlatformStorage.custom, 1);
});
dispatch_resume(PlatformStorage.timer);
LogMsg("DaemonIntialize done successfully");
return(err);
}
#endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
mDNSlocal mDNSs32 mDNSDaemonIdle(mDNS *const m)
{
mDNSs32 now = mDNS_TimeNow(m);
// 1. If we need to set domain secrets, do so before handling the network change
// Detailed reason:
// BTMM domains listed in DynStore Setup:/Network/BackToMyMac are added to the registration domains list,
// and we need to setup the associated AutoTunnel DomainAuthInfo entries before that happens.
if (m->p->KeyChainTimer && now - m->p->KeyChainTimer >= 0)
{
m->p->KeyChainTimer = 0;
mDNS_Lock(m);
SetDomainSecrets(m);
mDNS_Unlock(m);
}
// 2. If we have network change events to handle, do them before calling mDNS_Execute()
// Detailed reason:
// mDNSMacOSXNetworkChanged() currently closes and re-opens its sockets. If there are received packets waiting, they are lost.
// mDNS_Execute() generates packets, including multicasts that are looped back to ourself.
// If we call mDNS_Execute() first, and generate packets, and then call mDNSMacOSXNetworkChanged() immediately afterwards
// we then systematically lose our own looped-back packets.
if (m->NetworkChanged && now - m->NetworkChanged >= 0) mDNSMacOSXNetworkChanged();
if (m->p->RequestReSleep && now - m->p->RequestReSleep >= 0)
{
m->p->RequestReSleep = 0;
mDNSPowerRequest(0, 0);
}
// 3. Call mDNS_Execute() to let mDNSCore do what it needs to do
mDNSs32 nextevent = mDNS_Execute(m);
if (m->NetworkChanged)
if (nextevent - m->NetworkChanged > 0)
nextevent = m->NetworkChanged;
if (m->p->KeyChainTimer)
if (nextevent - m->p->KeyChainTimer > 0)
nextevent = m->p->KeyChainTimer;
if (m->p->RequestReSleep)
if (nextevent - m->p->RequestReSleep > 0)
nextevent = m->p->RequestReSleep;
if (m->p->NotifyUser)
{
if (m->p->NotifyUser - now < 0)
{
if (!SameDomainLabelCS(m->p->usernicelabel.c, m->nicelabel.c))
{
LogMsg("Name Conflict: Updated Computer Name from \"%#s\" to \"%#s\"", m->p->usernicelabel.c, m->nicelabel.c);
mDNSPreferencesSetNames(kmDNSComputerName, &m->p->usernicelabel, &m->nicelabel);
m->p->usernicelabel = m->nicelabel;
}
if (!SameDomainLabelCS(m->p->userhostlabel.c, m->hostlabel.c))
{
LogMsg("Name Conflict: Updated Local Hostname from \"%#s.local\" to \"%#s.local\"", m->p->userhostlabel.c, m->hostlabel.c);
mDNSPreferencesSetNames(kmDNSLocalHostName, &m->p->userhostlabel, &m->hostlabel);
m->p->HostNameConflict = 0; // Clear our indicator, now name change has been successful
m->p->userhostlabel = m->hostlabel;
}
m->p->NotifyUser = 0;
}
else
if (nextevent - m->p->NotifyUser > 0)
nextevent = m->p->NotifyUser;
}
return(nextevent);
}
// Right now we consider *ALL* of our DHCP leases
// It might make sense to be a bit more selective and only consider the leases on interfaces
// (a) that are capable and enabled for wake-on-LAN, and
// (b) where we have found (and successfully registered with) a Sleep Proxy
// If we can't be woken for traffic on a given interface, then why keep waking to renew its lease?
mDNSlocal mDNSu32 DHCPWakeTime(void)
{
mDNSu32 e = 24 * 3600; // Maximum maintenance wake interval is 24 hours
const CFAbsoluteTime now = CFAbsoluteTimeGetCurrent();
if (!now) LogMsg("DHCPWakeTime: CFAbsoluteTimeGetCurrent failed");
else
{
int ic, j;
const void *pattern = SCDynamicStoreKeyCreateNetworkServiceEntity(NULL, kSCDynamicStoreDomainState, kSCCompAnyRegex, kSCEntNetDHCP);
if (!pattern)
{
LogMsg("DHCPWakeTime: SCDynamicStoreKeyCreateNetworkServiceEntity failed\n");
return e;
}
CFArrayRef dhcpinfo = CFArrayCreate(NULL, (const void **)&pattern, 1, &kCFTypeArrayCallBacks);
CFRelease(pattern);
if (dhcpinfo)
{
SCDynamicStoreRef store = SCDynamicStoreCreate(NULL, CFSTR("DHCP-LEASES"), NULL, NULL);
if (store)
{
CFDictionaryRef dict = SCDynamicStoreCopyMultiple(store, NULL, dhcpinfo);
if (dict)
{
ic = CFDictionaryGetCount(dict);
const void *vals[ic];
CFDictionaryGetKeysAndValues(dict, NULL, vals);
for (j = 0; j < ic; j++)
{
const CFDictionaryRef dhcp = (CFDictionaryRef)vals[j];
if (dhcp)
{
const CFDateRef start = DHCPInfoGetLeaseStartTime(dhcp);
const CFDataRef lease = DHCPInfoGetOptionData(dhcp, 51); // Option 51 = IP Address Lease Time
if (!start || !lease || CFDataGetLength(lease) < 4)
LogMsg("DHCPWakeTime: SCDynamicStoreCopyDHCPInfo index %d failed "
"CFDateRef start %p CFDataRef lease %p CFDataGetLength(lease) %d",
j, start, lease, lease ? CFDataGetLength(lease) : 0);
else
{
const UInt8 *d = CFDataGetBytePtr(lease);
if (!d) LogMsg("DHCPWakeTime: CFDataGetBytePtr %d failed", j);
else
{
const mDNSu32 elapsed = now - CFDateGetAbsoluteTime(start);
const mDNSu32 lifetime = (mDNSs32) ((mDNSs32)d[0] << 24 | (mDNSs32)d[1] << 16 | (mDNSs32)d[2] << 8 | d[3]);
const mDNSu32 remaining = lifetime - elapsed;
const mDNSu32 wake = remaining > 60 ? remaining - remaining/10 : 54; // Wake at 90% of the lease time
LogSPS("DHCP Address Lease Elapsed %6u Lifetime %6u Remaining %6u Wake %6u", elapsed, lifetime, remaining, wake);
if (e > wake) e = wake;
}
}
}
}
CFRelease(dict);
}
CFRelease(store);
}
CFRelease(dhcpinfo);
}
}
return(e);
}
// We deliberately schedule our wakeup for halfway between when we'd *like* it and when we *need* it.
// For example, if our DHCP lease expires in two hours, we'll typically renew it at the halfway point, after one hour.
// If we scheduled our wakeup for the one-hour renewal time, that might be just seconds from now, and sleeping
// for a few seconds and then waking again is silly and annoying.
// If we scheduled our wakeup for the two-hour expiry time, and we were slow to wake, we might lose our lease.
// Scheduling our wakeup for halfway in between -- 90 minutes -- avoids short wakeups while still
// allowing us an adequate safety margin to renew our lease before we lose it.
mDNSlocal mDNSBool AllowSleepNow(mDNSs32 now)
{
mDNS *const m = &mDNSStorage;
mDNSBool ready = mDNSCoreReadyForSleep(m, now);
if (m->SleepState && !ready && now - m->SleepLimit < 0) return(mDNSfalse);
m->p->WakeAtUTC = 0;
int result = kIOReturnSuccess;
CFDictionaryRef opts = NULL;
// If the sleep request was cancelled, and we're no longer planning to sleep, don't need to
// do the stuff below, but we *DO* still need to acknowledge the sleep message we received.
if (!m->SleepState)
LogMsg("AllowSleepNow: Sleep request was canceled with %d ticks remaining", m->SleepLimit - now);
else
{
if (!m->SystemWakeOnLANEnabled || !mDNSCoreHaveAdvertisedMulticastServices(m))
LogSPS("AllowSleepNow: Not scheduling wakeup: SystemWakeOnLAN %s enabled; %s advertised services",
m->SystemWakeOnLANEnabled ? "is" : "not",
mDNSCoreHaveAdvertisedMulticastServices(m) ? "have" : "no");
else
{
mDNSs32 dhcp = DHCPWakeTime();
LogSPS("ComputeWakeTime: DHCP Wake %d", dhcp);
mDNSs32 interval = mDNSCoreIntervalToNextWake(m, now) / mDNSPlatformOneSecond;
if (interval > dhcp) interval = dhcp;
// If we're not ready to sleep (failed to register with Sleep Proxy, maybe because of
// transient network problem) then schedule a wakeup in one hour to try again. Otherwise,
// a single SPS failure could result in a remote machine falling permanently asleep, requiring
// someone to go to the machine in person to wake it up again, which would be unacceptable.
if (!ready && interval > 3600) interval = 3600;
//interval = 48; // For testing
#if !TARGET_OS_EMBEDDED
#ifdef kIOPMAcknowledgmentOptionSystemCapabilityRequirements
if (m->p->IOPMConnection) // If lightweight-wake capability is available, use that
{
const CFDateRef WakeDate = CFDateCreate(NULL, CFAbsoluteTimeGetCurrent() + interval);
if (!WakeDate) LogMsg("ScheduleNextWake: CFDateCreate failed");
else
{
const mDNSs32 reqs = kIOPMSystemPowerStateCapabilityNetwork;
const CFNumberRef Requirements = CFNumberCreate(NULL, kCFNumberSInt32Type, &reqs);
if (!Requirements) LogMsg("ScheduleNextWake: CFNumberCreate failed");
else
{
const void *OptionKeys[2] = { kIOPMAckDHCPRenewWakeDate, kIOPMAckSystemCapabilityRequirements };
const void *OptionVals[2] = { WakeDate, Requirements };
opts = CFDictionaryCreate(NULL, (void*)OptionKeys, (void*)OptionVals, 2, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
if (!opts) LogMsg("ScheduleNextWake: CFDictionaryCreate failed");
CFRelease(Requirements);
}
CFRelease(WakeDate);
}
LogSPS("AllowSleepNow: Will request lightweight wakeup in %d seconds", interval);
}
else // else schedule the wakeup using the old API instead to
#endif // kIOPMAcknowledgmentOptionSystemCapabilityRequirements
#endif // TARGET_OS_EMBEDDED
{
// If we wake within +/- 30 seconds of our requested time we'll assume the system woke for us,
// so we should put it back to sleep. To avoid frustrating the user, we always request at least
// 60 seconds sleep, so if they immediately re-wake the system within seconds of it going to sleep,
// we then shouldn't hit our 30-second window, and we won't attempt to re-sleep the machine.
if (interval < 60)
interval = 60;
result = mDNSPowerRequest(1, interval);
if (result == kIOReturnNotReady)
{
int r;
LogMsg("AllowSleepNow: Requested wakeup in %d seconds unsuccessful; retrying with longer intervals", interval);
// IOPMSchedulePowerEvent fails with kIOReturnNotReady (-536870184/0xe00002d8) if the
// requested wake time is "too soon", but there's no API to find out what constitutes
// "too soon" on any given OS/hardware combination, so if we get kIOReturnNotReady
// we just have to iterate with successively longer intervals until it doesn't fail.
// We preserve the value of "result" because if our original power request was deemed "too soon"
// for the machine to get to sleep and wake back up again, we attempt to cancel the sleep request,
// since the implication is that the system won't manage to be awake again at the time we need it.
do
{
interval += (interval < 20) ? 1 : ((interval+3) / 4);
r = mDNSPowerRequest(1, interval);
}
while (r == kIOReturnNotReady);
if (r) LogMsg("AllowSleepNow: Requested wakeup in %d seconds unsuccessful: %d %X", interval, r, r);
else LogSPS("AllowSleepNow: Requested later wakeup in %d seconds; will also attempt IOCancelPowerChange", interval);
}
else
{
if (result) LogMsg("AllowSleepNow: Requested wakeup in %d seconds unsuccessful: %d %X", interval, result, result);
else LogSPS("AllowSleepNow: Requested wakeup in %d seconds", interval);
}
m->p->WakeAtUTC = mDNSPlatformUTC() + interval;
}
}
m->SleepState = SleepState_Sleeping;
// Clear our interface list to empty state, ready to go to sleep
// As a side effect of doing this, we'll also cancel any outstanding SPS Resolve calls that didn't complete
mDNSMacOSXNetworkChanged();
}
LogSPS("AllowSleepNow: %s(%lX) %s at %ld (%d ticks remaining)",
#if !TARGET_OS_EMBEDDED && defined(kIOPMAcknowledgmentOptionSystemCapabilityRequirements)
(m->p->IOPMConnection) ? "IOPMConnectionAcknowledgeEventWithOptions" :
#endif
(result == kIOReturnSuccess) ? "IOAllowPowerChange" : "IOCancelPowerChange",
m->p->SleepCookie, ready ? "ready for sleep" : "giving up", now, m->SleepLimit - now);
m->SleepLimit = 0; // Don't clear m->SleepLimit until after we've logged it above
m->TimeSlept = mDNSPlatformUTC();
#if !TARGET_OS_EMBEDDED && defined(kIOPMAcknowledgmentOptionSystemCapabilityRequirements)
if (m->p->IOPMConnection) IOPMConnectionAcknowledgeEventWithOptions(m->p->IOPMConnection, m->p->SleepCookie, opts);
else
#endif
if (result == kIOReturnSuccess) IOAllowPowerChange (m->p->PowerConnection, m->p->SleepCookie);
else IOCancelPowerChange(m->p->PowerConnection, m->p->SleepCookie);
if (opts) CFRelease(opts);
return(mDNStrue);
}
#ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
mDNSexport void TriggerEventCompletion()
{
debugf("TriggerEventCompletion: Merge data");
dispatch_source_merge_data(PlatformStorage.custom, 1);
}
mDNSlocal void PrepareForIdle(void *m_param)
{
mDNS *m = m_param;
int64_t time_offset;
dispatch_time_t dtime;
const int multiplier = 1000000000 / mDNSPlatformOneSecond;
// This is the main work loop:
// (1) First we give mDNSCore a chance to finish off any of its deferred work and calculate the next sleep time
// (2) Then we make sure we've delivered all waiting browse messages to our clients
// (3) Then we sleep for the time requested by mDNSCore, or until the next event, whichever is sooner
debugf("PrepareForIdle: called");
// Run mDNS_Execute to find out the time we next need to wake up
mDNSs32 start = mDNSPlatformRawTime();
mDNSs32 nextTimerEvent = udsserver_idle(mDNSDaemonIdle(m));
mDNSs32 end = mDNSPlatformRawTime();
if (end - start >= WatchDogReportingThreshold)
LogInfo("CustomSourceHandler:WARNING: Idle task took %dms to complete", end - start);
mDNSs32 now = mDNS_TimeNow(m);
if (m->ShutdownTime)
{
if (mDNSStorage.ResourceRecords)
{
LogInfo("Cannot exit yet; Resource Record still exists: %s", ARDisplayString(m, mDNSStorage.ResourceRecords));
if (mDNS_LoggingEnabled) usleep(10000); // Sleep 10ms so that we don't flood syslog with too many messages
}
if (mDNS_ExitNow(m, now))
{
LogInfo("IdleLoop: mDNS_FinalExit");
mDNS_FinalExit(&mDNSStorage);
usleep(1000); // Little 1ms pause before exiting, so we don't lose our final syslog messages
exit(0);
}
if (nextTimerEvent - m->ShutdownTime >= 0)
nextTimerEvent = m->ShutdownTime;
}
if (m->SleepLimit)
if (!AllowSleepNow(now))
if (nextTimerEvent - m->SleepLimit >= 0)
nextTimerEvent = m->SleepLimit;
// Convert absolute wakeup time to a relative time from now
mDNSs32 ticks = nextTimerEvent - now;
if (ticks < 1) ticks = 1;
static mDNSs32 RepeatedBusy = 0; // Debugging sanity check, to guard against CPU spins
if (ticks > 1)
RepeatedBusy = 0;
else
{
ticks = 1;
if (++RepeatedBusy >= mDNSPlatformOneSecond) { ShowTaskSchedulingError(&mDNSStorage); RepeatedBusy = 0; }
}
time_offset = ((mDNSu32)ticks / mDNSPlatformOneSecond) * 1000000000 + (ticks % mDNSPlatformOneSecond) * multiplier;
dtime = dispatch_time(DISPATCH_TIME_NOW, time_offset);
dispatch_source_set_timer(PlatformStorage.timer, dtime, 1000ull*1000000000, 0);
debugf("PrepareForIdle: scheduling timer with ticks %d", ticks);
return;
}
#else // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
mDNSlocal void KQWokenFlushBytes(int fd, __unused short filter, __unused void *context, __unused mDNSBool encounteredEOF)
{
// Read all of the bytes so we won't wake again.
char buffer[100];
while (recv(fd, buffer, sizeof(buffer), MSG_DONTWAIT) > 0) continue;
}
mDNSlocal void SetLowWater(const KQSocketSet *const k, const int r)
{
if (k->sktv4 >=0 && setsockopt(k->sktv4, SOL_SOCKET, SO_RCVLOWAT, &r, sizeof(r)) < 0)
LogMsg("SO_RCVLOWAT IPv4 %d error %d errno %d (%s)", k->sktv4, r, errno, strerror(errno));
if (k->sktv6 >=0 && setsockopt(k->sktv6, SOL_SOCKET, SO_RCVLOWAT, &r, sizeof(r)) < 0)
LogMsg("SO_RCVLOWAT IPv6 %d error %d errno %d (%s)", k->sktv6, r, errno, strerror(errno));
}
mDNSlocal void * KQueueLoop(void *m_param)
{
mDNS *m = m_param;
int numevents = 0;
#if USE_SELECT_WITH_KQUEUEFD
fd_set readfds;
FD_ZERO(&readfds);
const int multiplier = 1000000 / mDNSPlatformOneSecond;
#else
const int multiplier = 1000000000 / mDNSPlatformOneSecond;
#endif
pthread_mutex_lock(&PlatformStorage.BigMutex);
LogInfo("Starting time value 0x%08lX (%ld)", (mDNSu32)mDNSStorage.timenow_last, mDNSStorage.timenow_last);
// This is the main work loop:
// (1) First we give mDNSCore a chance to finish off any of its deferred work and calculate the next sleep time
// (2) Then we make sure we've delivered all waiting browse messages to our clients
// (3) Then we sleep for the time requested by mDNSCore, or until the next event, whichever is sooner
// (4) On wakeup we first process *all* events
// (5) then when no more events remain, we go back to (1) to finish off any deferred work and do it all again
for ( ; ; )
{
#define kEventsToReadAtOnce 1
struct kevent new_events[kEventsToReadAtOnce];
// Run mDNS_Execute to find out the time we next need to wake up
mDNSs32 start = mDNSPlatformRawTime();
mDNSs32 nextTimerEvent = udsserver_idle(mDNSDaemonIdle(m));
mDNSs32 end = mDNSPlatformRawTime();
if (end - start >= WatchDogReportingThreshold)
LogInfo("WARNING: Idle task took %dms to complete", end - start);
#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING >= 1
validatelists(m);
#endif
mDNSs32 now = mDNS_TimeNow(m);
if (m->ShutdownTime)
{
if (mDNSStorage.ResourceRecords)
{
AuthRecord *rr;
for (rr = mDNSStorage.ResourceRecords; rr; rr=rr->next)
{
LogInfo("Cannot exit yet; Resource Record still exists: %s", ARDisplayString(m, rr));
if (mDNS_LoggingEnabled) usleep(10000); // Sleep 10ms so that we don't flood syslog with too many messages
}
}
if (mDNS_ExitNow(m, now))
{
LogInfo("mDNS_FinalExit");
mDNS_FinalExit(&mDNSStorage);
usleep(1000); // Little 1ms pause before exiting, so we don't lose our final syslog messages
exit(0);
}
if (nextTimerEvent - m->ShutdownTime >= 0)
nextTimerEvent = m->ShutdownTime;
}
if (m->SleepLimit)
if (!AllowSleepNow(now))
if (nextTimerEvent - m->SleepLimit >= 0)
nextTimerEvent = m->SleepLimit;
// Convert absolute wakeup time to a relative time from now
mDNSs32 ticks = nextTimerEvent - now;
if (ticks < 1) ticks = 1;
static mDNSs32 RepeatedBusy = 0; // Debugging sanity check, to guard against CPU spins
if (ticks > 1)
RepeatedBusy = 0;
else
{
ticks = 1;
if (++RepeatedBusy >= mDNSPlatformOneSecond) { ShowTaskSchedulingError(&mDNSStorage); RepeatedBusy = 0; }
}
verbosedebugf("KQueueLoop: Handled %d events; now sleeping for %d ticks", numevents, ticks);
numevents = 0;
// Release the lock, and sleep until:
// 1. Something interesting happens like a packet arriving, or
// 2. The other thread writes a byte to WakeKQueueLoopFD to poke us and make us wake up, or
// 3. The timeout expires
pthread_mutex_unlock(&PlatformStorage.BigMutex);
// If we woke up to receive a multicast, set low-water mark to dampen excessive wakeup rate
if (m->p->num_mcasts)
{
SetLowWater(&m->p->permanentsockets, 0x10000);
if (ticks > mDNSPlatformOneSecond / 8) ticks = mDNSPlatformOneSecond / 8;
}
#if USE_SELECT_WITH_KQUEUEFD
struct timeval timeout;
timeout.tv_sec = ticks / mDNSPlatformOneSecond;
timeout.tv_usec = (ticks % mDNSPlatformOneSecond) * multiplier;
FD_SET(KQueueFD, &readfds);
if (select(KQueueFD+1, &readfds, NULL, NULL, &timeout) < 0)
{ LogMsg("select(%d) failed errno %d (%s)", KQueueFD, errno, strerror(errno)); sleep(1); }
#else
struct timespec timeout;
timeout.tv_sec = ticks / mDNSPlatformOneSecond;
timeout.tv_nsec = (ticks % mDNSPlatformOneSecond) * multiplier;
// In my opinion, you ought to be able to call kevent() with nevents set to zero,
// and have it work similarly to the way it does with nevents non-zero --
// i.e. it waits until either an event happens or the timeout expires, and then wakes up.
// In fact, what happens if you do this is that it just returns immediately. So, we have
// to pass nevents set to one, and then we just ignore the event it gives back to us. -- SC
if (kevent(KQueueFD, NULL, 0, new_events, 1, &timeout) < 0)
{ LogMsg("kevent(%d) failed errno %d (%s)", KQueueFD, errno, strerror(errno)); sleep(1); }
#endif
pthread_mutex_lock(&PlatformStorage.BigMutex);
// We have to ignore the event we may have been told about above, because that
// was done without holding the lock, and between the time we woke up and the
// time we reclaimed the lock the other thread could have done something that
// makes the event no longer valid. Now we have the lock, we call kevent again
// and this time we can safely process the events it tells us about.
// If we changed UDP socket low-water mark, restore it, so we will be told about every packet
if (m->p->num_mcasts)
{
SetLowWater(&m->p->permanentsockets, 1);
m->p->num_mcasts = 0;
}
static const struct timespec zero_timeout = { 0, 0 };
int events_found;
while ((events_found = kevent(KQueueFD, NULL, 0, new_events, kEventsToReadAtOnce, &zero_timeout)) != 0)
{
if (events_found > kEventsToReadAtOnce || (events_found < 0 && errno != EINTR))
{
const int kevent_errno = errno;
// Not sure what to do here, our kqueue has failed us - this isn't ideal
LogMsg("ERROR: KQueueLoop - kevent failed errno %d (%s)", kevent_errno, strerror(kevent_errno));
exit(kevent_errno);
}
numevents += events_found;
int i;
for (i = 0; i < events_found; i++)
{
const KQueueEntry *const kqentry = new_events[i].udata;
mDNSs32 stime = mDNSPlatformRawTime();
const char *const KQtask = kqentry->KQtask; // Grab a copy in case KQcallback deletes the task
kqentry->KQcallback(new_events[i].ident, new_events[i].filter, kqentry->KQcontext, (new_events[i].flags & EV_EOF) != 0);
mDNSs32 etime = mDNSPlatformRawTime();
if (etime - stime >= WatchDogReportingThreshold)
LogInfo("WARNING: %s took %dms to complete", KQtask, etime - stime);
}
}
}
return NULL;
}
#endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
mDNSlocal size_t LaunchdCheckin(void)
{
// Ask launchd for our socket
int result = launch_activate_socket("Listeners", &launchd_fds, &launchd_fds_count);
if (result != 0) { LogMsg("launch_activate_socket() failed error %d (%s)", result, strerror(result)); }
return launchd_fds_count;
}
extern int sandbox_init(const char *profile, uint64_t flags, char **errorbuf) __attribute__((weak_import));
#if APPLE_OSX_mDNSResponder
mDNSlocal mDNSBool PreferencesGetValueBool(CFStringRef key, mDNSBool defaultValue)
{
CFBooleanRef boolean;
mDNSBool result = defaultValue;
boolean = CFPreferencesCopyAppValue(key, kProgramArguments);
if (boolean)
{
if (CFGetTypeID(boolean) == CFBooleanGetTypeID())
result = CFBooleanGetValue(boolean) ? mDNStrue : mDNSfalse;
CFRelease(boolean);
}
return result;
}
mDNSlocal int PreferencesGetValueInt(CFStringRef key, int defaultValue)
{
CFNumberRef number;
int numberValue;
int result = defaultValue;
number = CFPreferencesCopyAppValue(key, kProgramArguments);
if (number)
{
if ((CFGetTypeID(number) == CFNumberGetTypeID()) && CFNumberGetValue(number, kCFNumberIntType, &numberValue))
result = numberValue;
CFRelease(number);
}
return result;
}
#endif
mDNSlocal void SandboxProcess(void)
{
// Invoke sandbox profile /usr/share/sandbox/mDNSResponder.sb
#if MDNS_NO_SANDBOX
LogMsg("Note: Compiled without Apple Sandbox support");
#else // MDNS_NO_SANDBOX
if (!sandbox_init)
LogMsg("Note: Running without Apple Sandbox support (not available on this OS)");
else
{
char *sandbox_msg;
uint64_t sandbox_flags = SANDBOX_NAMED;
(void)confstr(_CS_DARWIN_USER_CACHE_DIR, NULL, 0);
int sandbox_err = sandbox_init("mDNSResponder", sandbox_flags, &sandbox_msg);
if (sandbox_err)
{
LogMsg("WARNING: sandbox_init error %s", sandbox_msg);
// If we have errors in the sandbox during development, to prevent
// exiting, uncomment the following line.
//sandbox_free_error(sandbox_msg);
errx(EX_OSERR, "sandbox_init() failed: %s", sandbox_msg);
}
else LogInfo("Now running under Apple Sandbox restrictions");
}
#endif // MDNS_NO_SANDBOX
}
#if APPLE_OSX_mDNSResponder
mDNSlocal void init_logging(void)
{
log_general = os_log_create("com.apple.mDNSResponder", "AllINFO");
if (!log_general)
{
// OS_LOG_DEFAULT is the default logging object, if you are not creating a custom subsystem/category
os_log_error(OS_LOG_DEFAULT, "Could NOT create log handle in mDNSResponder");
}
}
#endif
#ifdef UNIT_TEST
// Run the unit test main
UNITTEST_MAIN
#else
mDNSexport int main(int argc, char **argv)
{
int i;
kern_return_t status;
#if DEBUG
bool useDebugSocket = mDNSfalse;
bool useSandbox = mDNStrue;
#endif
#if APPLE_OSX_mDNSResponder
init_logging();
#endif
mDNSMacOSXSystemBuildNumber(NULL);
LogMsg("%s starting %s %d", mDNSResponderVersionString, OSXVers ? "OSXVers" : "iOSVers", OSXVers ? OSXVers : iOSVers);
#if 0
LogMsg("CacheRecord %5d", sizeof(CacheRecord));
LogMsg("CacheGroup %5d", sizeof(CacheGroup));
LogMsg("ResourceRecord %5d", sizeof(ResourceRecord));
LogMsg("RData_small %5d", sizeof(RData_small));
LogMsg("sizeof(CacheEntity) %5d", sizeof(CacheEntity));
LogMsg("RR_CACHE_SIZE %5d", RR_CACHE_SIZE);
LogMsg("block bytes used %5d", sizeof(CacheEntity) * RR_CACHE_SIZE);
LogMsg("block bytes wasted %5d", 32*1024 - sizeof(CacheEntity) * RR_CACHE_SIZE);
#endif
if (0 == geteuid())
{
LogMsg("mDNSResponder cannot be run as root !! Exiting..");
return -1;
}
for (i=1; i<argc; i++)
{
if (!strcasecmp(argv[i], "-d" )) mDNS_DebugMode = mDNStrue;
if (!strcasecmp(argv[i], "-NoMulticastAdvertisements")) NoMulticastAdvertisements = mDNStrue;
if (!strcasecmp(argv[i], "-DisableSleepProxyClient" )) DisableSleepProxyClient = mDNStrue;
if (!strcasecmp(argv[i], "-DebugLogging" )) mDNS_LoggingEnabled = mDNStrue;
if (!strcasecmp(argv[i], "-UnicastPacketLogging" )) mDNS_PacketLoggingEnabled = mDNStrue;
if (!strcasecmp(argv[i], "-OfferSleepProxyService" ))
OfferSleepProxyService = (i+1 < argc && mDNSIsDigit(argv[i+1][0]) && mDNSIsDigit(argv[i+1][1]) && argv[i+1][2]==0) ? atoi(argv[++i]) : 100;
if (!strcasecmp(argv[i], "-UseInternalSleepProxy" ))
UseInternalSleepProxy = (i+1<argc && mDNSIsDigit(argv[i+1][0]) && argv[i+1][1]==0) ? atoi(argv[++i]) : 1;
if (!strcasecmp(argv[i], "-StrictUnicastOrdering" )) StrictUnicastOrdering = mDNStrue;
if (!strcasecmp(argv[i], "-AlwaysAppendSearchDomains")) AlwaysAppendSearchDomains = mDNStrue;
if (!strcasecmp(argv[i], "-DisableAllowExpired" )) EnableAllowExpired = mDNSfalse;
#if DEBUG
if (!strcasecmp(argv[i], "-UseDebugSocket")) useDebugSocket = mDNStrue;
if (!strcasecmp(argv[i], "-NoSandbox")) useSandbox = mDNSfalse;
#endif
}
#if APPLE_OSX_mDNSResponder
/* Reads the external user's program arguments for mDNSResponder starting 10.11.x(El Capitan) on OSX. The options for external user are:
DebugLogging, UnicastPacketLogging, NoMulticastAdvertisements, StrictUnicastOrdering and AlwaysAppendSearchDomains
To turn ON the particular option, here is what the user should do (as an example of setting two options)
1] sudo defaults write /Library/Preferences/com.apple.mDNSResponder.plist AlwaysAppendSearchDomains -bool YES
2] sudo defaults write /Library/Preferences/com.apple.mDNSResponder.plist NoMulticastAdvertisements -bool YES
3] sudo reboot
To turn OFF all options, here is what the user should do
1] sudo defaults delete /Library/Preferences/com.apple.mDNSResponder.plist
2] sudo reboot
To view the current options set, here is what the user should do
1] plutil -p /Library/Preferences/com.apple.mDNSResponder.plist
OR
1] sudo defaults read /Library/Preferences/com.apple.mDNSResponder.plist
*/
// Currently on Fuji/Whitetail releases we are keeping the logging always enabled.
// Hence mDNS_LoggingEnabled and mDNS_PacketLoggingEnabled is set to true below by default.
#if 0
mDNS_LoggingEnabled = PreferencesGetValueBool(kPreferencesKey_DebugLogging, mDNS_LoggingEnabled);
mDNS_PacketLoggingEnabled = PreferencesGetValueBool(kPreferencesKey_UnicastPacketLogging, mDNS_PacketLoggingEnabled);
#endif
mDNS_LoggingEnabled = mDNStrue;
mDNS_PacketLoggingEnabled = mDNStrue;
NoMulticastAdvertisements = PreferencesGetValueBool(kPreferencesKey_NoMulticastAdvertisements, NoMulticastAdvertisements);
StrictUnicastOrdering = PreferencesGetValueBool(kPreferencesKey_StrictUnicastOrdering, StrictUnicastOrdering);
AlwaysAppendSearchDomains = PreferencesGetValueBool(kPreferencesKey_AlwaysAppendSearchDomains, AlwaysAppendSearchDomains);
EnableAllowExpired = PreferencesGetValueBool(kPreferencesKey_EnableAllowExpired, EnableAllowExpired);
OfferSleepProxyService = PreferencesGetValueInt(kPreferencesKey_OfferSleepProxyService, OfferSleepProxyService);
UseInternalSleepProxy = PreferencesGetValueInt(kPreferencesKey_UseInternalSleepProxy, UseInternalSleepProxy);
#if ENABLE_BLE_TRIGGERED_BONJOUR
EnableBLEBasedDiscovery = PreferencesGetValueBool(kPreferencesKey_EnableBLEBasedDiscovery, EnableBLEBasedDiscovery);
DefaultToBLETriggered = PreferencesGetValueBool(kPreferencesKey_DefaultToBLETriggered, DefaultToBLETriggered);
#endif // ENABLE_BLE_TRIGGERED_BONJOUR
#if TARGET_OS_IPHONE
PreallocateCacheMemory = PreferencesGetValueBool(kPreferencesKey_PreallocateCacheMemory, PreallocateCacheMemory);
#endif
#endif
// Note that mDNSPlatformInit will set DivertMulticastAdvertisements in the mDNS structure
if (NoMulticastAdvertisements)
LogMsg("-NoMulticastAdvertisements is set: Administratively prohibiting multicast advertisements");
if (AlwaysAppendSearchDomains)
LogMsg("-AlwaysAppendSearchDomains is set");
if (StrictUnicastOrdering)
LogMsg("-StrictUnicastOrdering is set");
#ifndef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
signal(SIGHUP, HandleSIG); // (Debugging) Purge the cache to check for cache handling bugs
signal(SIGINT, HandleSIG); // Ctrl-C: Detach from Mach BootstrapService and exit cleanly
signal(SIGPIPE, SIG_IGN); // Don't want SIGPIPE signals -- we'll handle EPIPE errors directly
signal(SIGTERM, HandleSIG); // Machine shutting down: Detach from and exit cleanly like Ctrl-C
signal(SIGINFO, HandleSIG); // (Debugging) Write state snapshot to syslog
signal(SIGUSR1, HandleSIG); // (Debugging) Enable Logging
signal(SIGUSR2, HandleSIG); // (Debugging) Enable Packet Logging
signal(SIGPROF, HandleSIG); // (Debugging) Toggle Multicast Logging
signal(SIGTSTP, HandleSIG); // (Debugging) Disable all Debug Logging (USR1/USR2/PROF)
#endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
mDNSStorage.p = &PlatformStorage; // Make sure mDNSStorage.p is set up, because validatelists uses it
// Need to Start XPC Server Before LaunchdCheckin() (Reason: rdar11023750)
xpc_server_init();
#if DEBUG
if (!useDebugSocket) {
if (LaunchdCheckin() == 0)
useDebugSocket = mDNStrue;
}
if (useDebugSocket)
SetDebugBoundPath();
#else
LaunchdCheckin();
#endif
#ifndef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
// Create the kqueue, mutex and thread to support KQSockets
KQueueFD = kqueue();
if (KQueueFD == -1)
{
const int kqueue_errno = errno;
LogMsg("kqueue() failed errno %d (%s)", kqueue_errno, strerror(kqueue_errno));
status = kqueue_errno;
goto exit;
}
i = pthread_mutex_init(&PlatformStorage.BigMutex, NULL);
if (i != 0) { LogMsg("pthread_mutex_init() failed error %d (%s)", i, strerror(i)); status = i; goto exit; }
int fdpair[2] = {0, 0};
i = socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair);
if (i == -1)
{
const int socketpair_errno = errno;
LogMsg("socketpair() failed errno %d (%s)", socketpair_errno, strerror(socketpair_errno));
status = socketpair_errno;
goto exit;
}
// Socket pair returned us two identical sockets connected to each other
// We will use the first socket to send the second socket. The second socket
// will be added to the kqueue so it will wake when data is sent.
static const KQueueEntry wakeKQEntry = { KQWokenFlushBytes, NULL, "kqueue wakeup after CFRunLoop event" };
PlatformStorage.WakeKQueueLoopFD = fdpair[0];
KQueueSet(fdpair[1], EV_ADD, EVFILT_READ, &wakeKQEntry);
#endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
#if DEBUG
if (useSandbox)
#endif
SandboxProcess();
#if AWD_METRICS
status = MetricsInit();
if (status) { LogMsg("Daemon start: MetricsInit failed (%d)", status); }
#endif
status = mDNSDaemonInitialize();
if (status) { LogMsg("Daemon start: mDNSDaemonInitialize failed"); goto exit; }
status = udsserver_init(launchd_fds, launchd_fds_count);
if (status) { LogMsg("Daemon start: udsserver_init failed"); goto exit; }
mDNSMacOSXNetworkChanged();
UpdateDebugState();
#ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
LogInfo("Daemon Start: Using LibDispatch");
// CFRunLoopRun runs both CFRunLoop sources and dispatch sources
CFRunLoopRun();
#else // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
// Start the kqueue thread
pthread_t KQueueThread;
i = pthread_create(&KQueueThread, NULL, KQueueLoop, &mDNSStorage);
if (i != 0) { LogMsg("pthread_create() failed error %d (%s)", i, strerror(i)); status = i; goto exit; }
if (status == 0)
{
CFRunLoopRun();
LogMsg("ERROR: CFRunLoopRun Exiting.");
mDNS_Close(&mDNSStorage);
}
#endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
LogMsg("%s exiting", mDNSResponderVersionString);
exit:
return(status);
}
#endif // UNIT_TEST
// uds_daemon.c support routines /////////////////////////////////////////////
mDNSlocal void kqUDSEventCallback(int fd, short filter, void *context, __unused mDNSBool encounteredEOF)
{
const KQSocketEventSource *const source = context;
source->callback(fd, filter, source->context);
}
// Arrange things so that when data appears on fd, callback is called with context
mDNSexport mStatus udsSupportAddFDToEventLoop(int fd, udsEventCallback callback, void *context, void **platform_data)
{
KQSocketEventSource **p = &gEventSources;
(void) platform_data;
while (*p && (*p)->fd != fd) p = &(*p)->next;
if (*p) { LogMsg("udsSupportAddFDToEventLoop: ERROR fd %d already has EventLoop source entry", fd); return mStatus_AlreadyRegistered; }
KQSocketEventSource *newSource = (KQSocketEventSource*) mallocL("KQSocketEventSource", sizeof *newSource);
if (!newSource) return mStatus_NoMemoryErr;
newSource->next = mDNSNULL;
newSource->fd = fd;
newSource->callback = callback;
newSource->context = context;
newSource->kqs.KQcallback = kqUDSEventCallback;
newSource->kqs.KQcontext = newSource;
newSource->kqs.KQtask = "UDS client";
#ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
newSource->kqs.readSource = mDNSNULL;
newSource->kqs.writeSource = mDNSNULL;
newSource->kqs.fdClosed = mDNSfalse;
#endif // MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
if (KQueueSet(fd, EV_ADD, EVFILT_READ, &newSource->kqs) == 0)
{
*p = newSource;
return mStatus_NoError;
}
LogMsg("KQueueSet failed for fd %d errno %d (%s)", fd, errno, strerror(errno));
freeL("KQSocketEventSource", newSource);
return mStatus_BadParamErr;
}
int udsSupportReadFD(dnssd_sock_t fd, char *buf, int len, int flags, void *platform_data)
{
(void) platform_data;
return recv(fd, buf, len, flags);
}
mDNSexport mStatus udsSupportRemoveFDFromEventLoop(int fd, void *platform_data) // Note: This also CLOSES the file descriptor
{
KQSocketEventSource **p = &gEventSources;
(void) platform_data;
while (*p && (*p)->fd != fd) p = &(*p)->next;
if (*p)
{
KQSocketEventSource *s = *p;
*p = (*p)->next;
// We don't have to explicitly do a kqueue EV_DELETE here because closing the fd
// causes the kernel to automatically remove any associated kevents
mDNSPlatformCloseFD(&s->kqs, s->fd);
freeL("KQSocketEventSource", s);
return mStatus_NoError;
}
LogMsg("udsSupportRemoveFDFromEventLoop: ERROR fd %d not found in EventLoop source list", fd);
return mStatus_NoSuchNameErr;
}
#ifdef UNIT_TEST
#include "../unittests/daemon_ut.c"
#endif // UNIT_TEST
#if _BUILDING_XCODE_PROJECT_
// If mDNSResponder crashes, then this string will be magically included in the automatically-generated crash log
const char *__crashreporter_info__ = mDNSResponderVersionString;
asm (".desc ___crashreporter_info__, 0x10");
#endif
// For convenience when using the "strings" command, this is the last thing in the file
// The "@(#) " pattern is a special prefix the "what" command looks for
mDNSexport const char mDNSResponderVersionString_SCCS[] = "@(#) mDNSResponder " STRINGIFY(mDNSResponderVersion) " (" __DATE__ " " __TIME__ ")";
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