mDNSMacOSX/mDNSMacOSX.h

   1 /* -*- Mode: C; tab-width: 4 -*-
   2  *
   3  * Copyright (c) 2002-2015 Apple Inc. All rights reserved.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #ifndef __mDNSMacOSX_h
  19 #define __mDNSMacOSX_h
  20
  21 #ifdef  __cplusplus
  22 extern "C" {
  23 #endif
  24
  25 #include <SystemConfiguration/SystemConfiguration.h>
  26 #include <IOKit/pwr_mgt/IOPM.h>
  27 #include <IOKit/pwr_mgt/IOPMLib.h>
  28 #include <IOKit/pwr_mgt/IOPMLibPrivate.h>
  29 #include <sys/socket.h>
  30 #include <netinet/in.h>
  31 #include "mDNSEmbeddedAPI.h"  // for domain name structure
  32
  33 #include <net/if.h>
  34 #include <os/log.h>
  35
  36 //#define MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
  37 #ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
  38 #include <dispatch/dispatch.h>
  39 #include <dispatch/private.h>
  40 #endif
  41
  42 #if TARGET_OS_EMBEDDED
  43 #define NO_SECURITYFRAMEWORK 1
  44 #define NO_CFUSERNOTIFICATION 1
  45 #include <MobileGestalt.h> // for IsAppleTV()
  46 #endif
  47
  48 #ifndef NO_SECURITYFRAMEWORK
  49 #include <Security/SecureTransport.h>
  50 #include <Security/Security.h>
  51 #endif /* NO_SECURITYFRAMEWORK */
  52
  53 enum mDNSDynamicStoreSetConfigKey
  54 {
  55     kmDNSMulticastConfig = 1,
  56     kmDNSDynamicConfig,
  57     kmDNSPrivateConfig,
  58     kmDNSBackToMyMacConfig,
  59     kmDNSSleepProxyServersState,
  60     kmDNSDebugState,
  61 };
  62
  63 typedef struct NetworkInterfaceInfoOSX_struct NetworkInterfaceInfoOSX;
  64
  65 typedef void (*KQueueEventCallback)(int fd, short filter, void *context);
  66 typedef struct
  67 {
  68     KQueueEventCallback KQcallback;
  69     void                *KQcontext;
  70     const char          *KQtask;        // For debugging messages
  71 #ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
  72     dispatch_source_t readSource;
  73     dispatch_source_t writeSource;
  74     mDNSBool fdClosed;
  75 #endif
  76 } KQueueEntry;
  77
  78 typedef struct
  79 {
  80     mDNSIPPort port; // MUST BE FIRST FIELD -- UDPSocket_struct begins with a KQSocketSet,
  81     // and mDNSCore requires every UDPSocket_struct to begin with a mDNSIPPort port
  82     mDNS                    *m;
  83     int sktv4;
  84     KQueueEntry kqsv4;
  85     int sktv6;
  86     KQueueEntry kqsv6;
  87     int                     *closeFlag;
  88     mDNSBool proxy;
  89 } KQSocketSet;
  90
  91 struct UDPSocket_struct
  92 {
  93     KQSocketSet ss;     // First field of KQSocketSet has to be mDNSIPPort -- mDNSCore requires every UDPSocket_struct to begin with mDNSIPPort port
  94 };
  95
  96 // TCP socket support
  97
  98 typedef enum
  99 {
 100     handshake_required,
 101     handshake_in_progress,
 102     handshake_completed,
 103     handshake_to_be_closed
 104 } handshakeStatus;
 105
 106 struct TCPSocket_struct
 107 {
 108     TCPSocketFlags flags;       // MUST BE FIRST FIELD -- mDNSCore expects every TCPSocket_struct to begin with TCPSocketFlags flags
 109     TCPConnectionCallback callback;
 110     int fd;
 111     KQueueEntry *kqEntry;
 112     KQSocketSet ss;
 113 #ifndef NO_SECURITYFRAMEWORK
 114     SSLContextRef tlsContext;
 115     pthread_t handshake_thread;
 116 #endif /* NO_SECURITYFRAMEWORK */
 117     domainname hostname;
 118     void *context;
 119     mDNSBool setup;
 120     mDNSBool connected;
 121     handshakeStatus handshake;
 122     mDNS *m; // So we can call KQueueLock from the SSLHandshake thread
 123     mStatus err;
 124 };
 125
 126 struct NetworkInterfaceInfoOSX_struct
 127 {
 128     NetworkInterfaceInfo ifinfo;                // MUST be the first element in this structure
 129     NetworkInterfaceInfoOSX *next;
 130     mDNS                    *m;
 131     mDNSu8 Exists;                              // 1 = currently exists in getifaddrs list; 0 = doesn't
 132                                                 // 2 = exists, but McastTxRx state changed
 133     mDNSu8 Flashing;                            // Set if interface appeared for less than 60 seconds and then vanished
 134     mDNSu8 Occulting;                           // Set if interface vanished for less than 60 seconds and then came back
 135     mDNSu8 D2DInterface;                        // IFEF_LOCALNET_PRIVATE flag indicates we should call
 136                                                 // D2D plugin for operations over this interface
 137     mDNSs32 AppearanceTime;                     // Time this interface appeared most recently in getifaddrs list
 138                                                 // i.e. the first time an interface is seen, AppearanceTime is set.
 139                                                 // If an interface goes away temporarily and then comes back then
 140                                                 // AppearanceTime is updated to the time of the most recent appearance.
 141     mDNSs32 LastSeen;                           // If Exists==0, last time this interface appeared in getifaddrs list
 142     unsigned int ifa_flags;
 143     struct in_addr ifa_v4addr;
 144     mDNSu32 scope_id;                           // interface index / IPv6 scope ID
 145     mDNSEthAddr BSSID;                          // BSSID of 802.11 base station, if applicable
 146     u_short sa_family;
 147     int BPF_fd;                                 // -1 uninitialized; -2 requested BPF; -3 failed
 148     int BPF_mcfd;                               // Socket for our IPv6 ND group membership
 149     u_int BPF_len;
 150 #ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
 151     dispatch_source_t BPF_source;
 152 #else
 153     CFSocketRef BPF_cfs;
 154     CFRunLoopSourceRef BPF_rls;
 155 #endif
 156     NetworkInterfaceInfoOSX *Registered;        // non-NULL means registered with mDNS Core
 157 };
 158
 159 struct mDNS_PlatformSupport_struct
 160 {
 161     NetworkInterfaceInfoOSX *InterfaceList;
 162     KQSocketSet permanentsockets;
 163     int num_mcasts;                             // Number of multicasts received during this CPU scheduling period (used for CPU limiting)
 164     domainlabel userhostlabel;                  // The hostlabel as it was set in System Preferences the last time we looked
 165     domainlabel usernicelabel;                  // The nicelabel as it was set in System Preferences the last time we looked
 166     // Following four variables are used for optimization where the helper is not
 167     // invoked when not needed. It records the state of what we told helper the
 168     // last time we invoked mDNSPreferencesSetName
 169     domainlabel prevoldhostlabel;               // Previous m->p->userhostlabel
 170     domainlabel prevnewhostlabel;               // Previous m->hostlabel
 171     domainlabel prevoldnicelabel;               // Previous m->p->usernicelabel
 172     domainlabel prevnewnicelabel;               // Previous m->nicelabel
 173     mDNSs32 NotifyUser;
 174     mDNSs32 HostNameConflict;                   // Time we experienced conflict on our link-local host name
 175     mDNSs32 KeyChainTimer;
 176
 177     SCDynamicStoreRef Store;
 178     CFRunLoopSourceRef StoreRLS;
 179     CFRunLoopSourceRef PMRLS;
 180     int SysEventNotifier;
 181     KQueueEntry SysEventKQueue;
 182     IONotificationPortRef PowerPortRef;
 183     io_connect_t PowerConnection;
 184     io_object_t PowerNotifier;
 185 #ifdef kIOPMAcknowledgmentOptionSystemCapabilityRequirements
 186     IOPMConnection IOPMConnection;
 187 #endif
 188     IOPMAssertionID IOPMAssertion;
 189     long SleepCookie;                           // Cookie we need to pass to IOAllowPowerChange()
 190     long WakeAtUTC;
 191     mDNSs32 RequestReSleep;
 192 #ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
 193     dispatch_source_t timer;
 194     dispatch_source_t custom;
 195 #else
 196     pthread_mutex_t BigMutex;
 197 #endif
 198     mDNSs32 BigMutexStartTime;
 199     int WakeKQueueLoopFD;
 200     mDNSu8 v4answers;                  // non-zero if we are receiving answers
 201     mDNSu8 v6answers;                  // for A/AAAA from external DNS servers
 202     mDNSs32 DNSTrigger;                // Time the DNSTrigger was given
 203     uint64_t LastConfigGeneration;     // DNS configuration generation number
 204     UDPSocket UDPProxy;
 205     TCPSocket TCPProxy;
 206     ProxyCallback *UDPProxyCallback;
 207     ProxyCallback *TCPProxyCallback;
 208 };
 209
 210 extern int OfferSleepProxyService;
 211 extern int DisableSleepProxyClient;
 212 extern int UseInternalSleepProxy;
 213 extern int OSXVers, iOSVers;
 214
 215 extern int KQueueFD;
 216
 217 extern void NotifyOfElusiveBug(const char *title, const char *msg); // Both strings are UTF-8 text
 218 extern void SetDomainSecrets(mDNS *m);
 219 extern void mDNSMacOSXNetworkChanged(mDNS *const m);
 220 extern void mDNSMacOSXSystemBuildNumber(char *HINFO_SWstring);
 221 extern NetworkInterfaceInfoOSX *IfindexToInterfaceInfoOSX(const mDNS *const m, mDNSInterfaceID ifindex);
 222 extern void mDNSUpdatePacketFilter(const ResourceRecord *const excludeRecord);
 223 extern void myKQSocketCallBack(int s1, short filter, void *context);
 224 extern void mDNSDynamicStoreSetConfig(int key, const char *subkey, CFPropertyListRef value);
 225 extern void UpdateDebugState(void);
 226
 227 #ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
 228 extern int KQueueSet(int fd, u_short flags, short filter, KQueueEntry *const entryRef);
 229 mDNSexport void TriggerEventCompletion(void);
 230 #else
 231 extern int KQueueSet(int fd, u_short flags, short filter, const KQueueEntry *const entryRef);
 232 #endif
 233
 234 // When events are processed on the non-kqueue thread (i.e. CFRunLoop notifications like Sleep/Wake,
 235 // Interface changes, Keychain changes, etc.) they must use KQueueLock/KQueueUnlock to lock out the kqueue thread
 236 extern void KQueueLock(mDNS *const m);
 237 extern void KQueueUnlock(mDNS *const m, const char* task);
 238 extern void mDNSPlatformCloseFD(KQueueEntry *kq, int fd);
 239 extern ssize_t myrecvfrom(const int s, void *const buffer, const size_t max,
 240                              struct sockaddr *const from, size_t *const fromlen, mDNSAddr *dstaddr, char *ifname, mDNSu8 *ttl);
 241
 242 extern mDNSBool DictionaryIsEnabled(CFDictionaryRef dict);
 243
 244 extern void CUPInit(mDNS *const m);
 245 extern const char *DNSScopeToString(mDNSu32 scope);
 246
 247 // If any event takes more than WatchDogReportingThreshold milliseconds to be processed, we log a warning message
 248 // General event categories are:
 249 //  o Mach client request initiated / terminated
 250 //  o UDS client request
 251 //  o Handling UDP packets received from the network
 252 //  o Environmental change events:
 253 //    - network interface changes
 254 //    - sleep/wake
 255 //    - keychain changes
 256 //  o Name conflict dialog dismissal
 257 //  o Reception of Unix signal (e.g. SIGINFO)
 258 //  o Idle task processing
 259 // If we find that we're getting warnings for any of these categories, and it's not evident
 260 // what's causing the problem, we may need to subdivide some categories into finer-grained
 261 // sub-categories (e.g. "Idle task processing" covers a pretty broad range of sub-tasks).
 262
 263 extern int WatchDogReportingThreshold;
 264
 265 struct CompileTimeAssertionChecks_mDNSMacOSX
 266 {
 267     // Check our structures are reasonable sizes. Including overly-large buffers, or embedding
 268     // other overly-large structures instead of having a pointer to them, can inadvertently
 269     // cause structure sizes (and therefore memory usage) to balloon unreasonably.
 270
 271     // Checks commented out when sizeof(DNSQuestion) change cascaded into having to change yet another
 272     // set of hardcoded size values because these structures contain one or more DNSQuestion
 273     // instances.
 274 //    char sizecheck_NetworkInterfaceInfoOSX[(sizeof(NetworkInterfaceInfoOSX) <=  7084) ? 1 : -1];
 275     char sizecheck_mDNS_PlatformSupport   [(sizeof(mDNS_PlatformSupport)    <=  1378) ? 1 : -1];
 276 };
 277
 278 #ifdef  __cplusplus
 279 }
 280 #endif
 281
 282 #endif