mDNSCore/mDNSDebug.h

   1 /*
   2  * Copyright (c) 2002-2019 Apple Inc. All rights reserved.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #ifndef __mDNSDebug_h
  18 #define __mDNSDebug_h
  19
  20 #include "mDNSFeatures.h"
  21
  22 #if MDNSRESPONDER_SUPPORTS(APPLE, OS_LOG)
  23 #include <os/log.h>
  24 #endif
  25
  26 // Set MDNS_DEBUGMSGS to 0 to optimize debugf() calls out of the compiled code
  27 // Set MDNS_DEBUGMSGS to 1 to generate normal debugging messages
  28 // Set MDNS_DEBUGMSGS to 2 to generate verbose debugging messages
  29 // MDNS_DEBUGMSGS is normally set in the project options (or makefile) but can also be set here if desired
  30 // (If you edit the file here to turn on MDNS_DEBUGMSGS while you're debugging some code, be careful
  31 // not to accidentally check-in that change by mistake when you check in your other changes.)
  32
  33 //#undef MDNS_DEBUGMSGS
  34 //#define MDNS_DEBUGMSGS 2
  35
  36 // Set MDNS_CHECK_PRINTF_STYLE_FUNCTIONS to 1 to enable extra GCC compiler warnings
  37 // Note: You don't normally want to do this, because it generates a bunch of
  38 // spurious warnings for the following custom extensions implemented by mDNS_vsnprintf:
  39 //    warning: `#' flag used with `%s' printf format    (for %#s              -- pascal string format)
  40 //    warning: repeated `#' flag in format              (for %##s             -- DNS name string format)
  41 //    warning: double format, pointer arg (arg 2)       (for %.4a, %.16a, %#a -- IP address formats)
  42 #define MDNS_CHECK_PRINTF_STYLE_FUNCTIONS 0
  43
  44 #if MDNSRESPONDER_SUPPORTS(APPLE, OS_LOG)
  45 typedef os_log_t mDNSLogCategory_t;
  46
  47 typedef os_log_type_t mDNSLogLevel_t;
  48 #define MDNS_LOG_FAULT      OS_LOG_TYPE_FAULT
  49 #define MDNS_LOG_ERROR      OS_LOG_TYPE_ERROR
  50 #define MDNS_LOG_WARNING    OS_LOG_TYPE_DEFAULT
  51 #define MDNS_LOG_DEFAULT    OS_LOG_TYPE_DEFAULT
  52 #define MDNS_LOG_INFO       OS_LOG_TYPE_DEFAULT
  53 #define MDNS_LOG_DEBUG      OS_LOG_TYPE_DEBUG
  54 #else
  55 typedef const char * mDNSLogCategory_t;
  56 typedef enum
  57 {
  58     MDNS_LOG_FAULT   = 1,
  59     MDNS_LOG_ERROR   = 2,
  60     MDNS_LOG_WARNING = 3,
  61     MDNS_LOG_DEFAULT = 4,
  62     MDNS_LOG_INFO    = 5,
  63     MDNS_LOG_DEBUG   = 6
  64 } mDNSLogLevel_t;
  65 #endif
  66
  67 #if MDNSRESPONDER_SUPPORTS(APPLE, OS_LOG)
  68     extern os_log_t mDNSLogCategory_Default;
  69     extern os_log_t mDNSLogCategory_mDNS;
  70     extern os_log_t mDNSLogCategory_uDNS;
  71     extern os_log_t mDNSLogCategory_SPS;
  72     extern os_log_t mDNSLogCategory_XPC;
  73     extern os_log_t mDNSLogCategory_Analytics;
  74     extern os_log_t mDNSLogCategory_DNSSEC;
  75
  76     #define MDNS_LOG_CATEGORY_DEFINITION(NAME)  mDNSLogCategory_ ## NAME
  77 #else
  78     #define MDNS_LOG_CATEGORY_DEFINITION(NAME)  # NAME
  79 #endif
  80
  81 #define MDNS_LOG_CATEGORY_DEFAULT   MDNS_LOG_CATEGORY_DEFINITION(Default)
  82 #define MDNS_LOG_CATEGORY_MDNS      MDNS_LOG_CATEGORY_DEFINITION(mDNS)
  83 #define MDNS_LOG_CATEGORY_UDNS      MDNS_LOG_CATEGORY_DEFINITION(uDNS)
  84 #define MDNS_LOG_CATEGORY_SPS       MDNS_LOG_CATEGORY_DEFINITION(SPS)
  85 #define MDNS_LOG_CATEGORY_XPC       MDNS_LOG_CATEGORY_DEFINITION(XPC)
  86 #define MDNS_LOG_CATEGORY_ANALYTICS MDNS_LOG_CATEGORY_DEFINITION(Analytics)
  87 #define MDNS_LOG_CATEGORY_DNSSEC    MDNS_LOG_CATEGORY_DEFINITION(DNSSEC)
  88
  89 // Set this symbol to 1 to answer remote queries for our Address, and reverse mapping PTR
  90 #define ANSWER_REMOTE_HOSTNAME_QUERIES 0
  91
  92 // Set this symbol to 1 to do extra debug checks on malloc() and free()
  93 // Set this symbol to 2 to write a log message for every malloc() and free()
  94 // #define MDNS_MALLOC_DEBUGGING 1
  95
  96 #if (MDNS_MALLOC_DEBUGGING > 0) && defined(WIN32)
  97 #error "Malloc debugging does not yet work on Windows"
  98 #endif
  99
 100 //#define ForceAlerts 1
 101 //#define LogTimeStamps 1
 102
 103 // Developer-settings section ends here
 104
 105 #if MDNS_CHECK_PRINTF_STYLE_FUNCTIONS
 106 #define IS_A_PRINTF_STYLE_FUNCTION(F,A) __attribute__ ((format(printf,F,A)))
 107 #else
 108 #define IS_A_PRINTF_STYLE_FUNCTION(F,A)
 109 #endif
 110
 111 #ifdef __cplusplus
 112 extern "C" {
 113 #endif
 114
 115 // Variable argument macro support. Use ANSI C99 __VA_ARGS__ where possible. Otherwise, use the next best thing.
 116
 117 #if (defined(__GNUC__))
 118     #if ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 2)))
 119         #define MDNS_C99_VA_ARGS        1
 120         #define MDNS_GNU_VA_ARGS        0
 121     #else
 122         #define MDNS_C99_VA_ARGS        0
 123         #define MDNS_GNU_VA_ARGS        1
 124     #endif
 125     #define MDNS_HAS_VA_ARG_MACROS      1
 126 #elif (_MSC_VER >= 1400) // Visual Studio 2005 and later
 127     #define MDNS_C99_VA_ARGS            1
 128     #define MDNS_GNU_VA_ARGS            0
 129     #define MDNS_HAS_VA_ARG_MACROS      1
 130 #elif (defined(__MWERKS__))
 131     #define MDNS_C99_VA_ARGS            1
 132     #define MDNS_GNU_VA_ARGS            0
 133     #define MDNS_HAS_VA_ARG_MACROS      1
 134 #else
 135     #define MDNS_C99_VA_ARGS            0
 136     #define MDNS_GNU_VA_ARGS            0
 137     #define MDNS_HAS_VA_ARG_MACROS      0
 138 #endif
 139
 140 #if (MDNS_HAS_VA_ARG_MACROS)
 141     #if (MDNS_C99_VA_ARGS)
 142         #define MDNS_LOG_DEFINITION(LEVEL, ...) \
 143             do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_CATEGORY_DEFAULT, LEVEL, __VA_ARGS__); } while (0)
 144
 145         #define debug_noop(...)   do {} while(0)
 146         #define LogMsg(...)       LogMsgWithLevel(MDNS_LOG_CATEGORY_DEFAULT, MDNS_LOG_DEFAULT, __VA_ARGS__)
 147         #define LogOperation(...) MDNS_LOG_DEFINITION(MDNS_LOG_INFO,  __VA_ARGS__)
 148         #define LogSPS(...)       MDNS_LOG_DEFINITION(MDNS_LOG_INFO,  __VA_ARGS__)
 149         #define LogInfo(...)      MDNS_LOG_DEFINITION(MDNS_LOG_INFO,  __VA_ARGS__)
 150         #define LogDebug(...)     MDNS_LOG_DEFINITION(MDNS_LOG_DEBUG, __VA_ARGS__)
 151     #elif (MDNS_GNU_VA_ARGS)
 152         #define MDNS_LOG_DEFINITION(LEVEL, ARGS...) \
 153             do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_CATEGORY_DEFAULT, LEVEL, ARGS); } while (0)
 154
 155         #define debug_noop(ARGS...)   do {} while (0)
 156         #define LogMsg(ARGS... )      LogMsgWithLevel(MDNS_LOG_CATEGORY_DEFAULT, MDNS_LOG_DEFAULT, ARGS)
 157         #define LogOperation(ARGS...) MDNS_LOG_DEFINITION(MDNS_LOG_INFO,  ARGS)
 158         #define LogSPS(ARGS...)       MDNS_LOG_DEFINITION(MDNS_LOG_INFO,  ARGS)
 159         #define LogInfo(ARGS...)      MDNS_LOG_DEFINITION(MDNS_LOG_INFO,  ARGS)
 160         #define LogDebug(ARGS...)     MDNS_LOG_DEFINITION(MDNS_LOG_DEBUG, ARGS)
 161     #else
 162         #error "Unknown variadic macros"
 163     #endif
 164 #else
 165 // If your platform does not support variadic macros, you need to define the following variadic functions.
 166 // See mDNSShared/mDNSDebug.c for sample implementation
 167     #define debug_noop 1 ? (void)0 : (void)
 168     #define LogMsg LogMsg_
 169     #define LogOperation (mDNS_LoggingEnabled == 0) ? ((void)0) : LogOperation_
 170     #define LogSPS       (mDNS_LoggingEnabled == 0) ? ((void)0) : LogSPS_
 171     #define LogInfo      (mDNS_LoggingEnabled == 0) ? ((void)0) : LogInfo_
 172     #define LogDebug     (mDNS_LoggingEnabled == 0) ? ((void)0) : LogDebug_
 173 extern void LogMsg_(const char *format, ...)       IS_A_PRINTF_STYLE_FUNCTION(1,2);
 174 extern void LogOperation_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2);
 175 extern void LogSPS_(const char *format, ...)       IS_A_PRINTF_STYLE_FUNCTION(1,2);
 176 extern void LogInfo_(const char *format, ...)      IS_A_PRINTF_STYLE_FUNCTION(1,2);
 177 extern void LogDebug_(const char *format, ...)     IS_A_PRINTF_STYLE_FUNCTION(1,2);
 178 #endif
 179
 180
 181 #if MDNS_DEBUGMSGS
 182 #define debugf debugf_
 183 extern void debugf_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2);
 184 #else
 185 #define debugf debug_noop
 186 #endif
 187
 188 #if MDNS_DEBUGMSGS > 1
 189 #define verbosedebugf verbosedebugf_
 190 extern void verbosedebugf_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2);
 191 #else
 192 #define verbosedebugf debug_noop
 193 #endif
 194
 195 extern int mDNS_LoggingEnabled;
 196 extern int mDNS_PacketLoggingEnabled;
 197 extern int mDNS_McastLoggingEnabled;
 198 extern int mDNS_McastTracingEnabled;
 199 extern int mDNS_DebugMode;          // If non-zero, LogMsg() writes to stderr instead of syslog
 200 extern const char ProgramName[];
 201
 202 extern void LogMsgWithLevel(mDNSLogCategory_t category, mDNSLogLevel_t level, const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(3,4);
 203 // LogMsgNoIdent needs to be fixed so that it logs without the ident prefix like it used to
 204 // (or completely overhauled to use the new "log to a separate file" facility)
 205 #define LogMsgNoIdent LogMsg
 206
 207 #if APPLE_OSX_mDNSResponder
 208 extern void LogFatalError(const char *format, ...);
 209 #else
 210 #define LogFatalError LogMsg
 211 #endif
 212
 213 #if MDNS_MALLOC_DEBUGGING >= 1
 214 extern void *mallocL(const char *msg, mDNSu32 size);
 215 extern void *callocL(const char *msg, mDNSu32 size);
 216 extern void freeL(const char *msg, void *x);
 217 #if APPLE_OSX_mDNSResponder
 218 extern void LogMemCorruption(const char *format, ...);
 219 #else
 220 #define LogMemCorruption LogMsg
 221 #endif
 222 #else
 223 #define mallocL(MSG, SIZE) malloc(SIZE)
 224 #define callocL(MSG, SIZE) calloc(1, SIZE)
 225 #define freeL(MSG, PTR) free(PTR)
 226 #endif
 227
 228 #ifdef __cplusplus
 229 }
 230 #endif
 231
 232 #if MDNSRESPONDER_SUPPORTS(APPLE, OS_LOG)
 233 /** @brief Write a log message to system's log storage(memory or disk).
 234  *
 235  *  On Apple platform, os_log() will be called to log a message.
 236  *
 237  *  @param CATEGORY         A custom log object previously created by the os_log_create function, and such an object is
 238  *                          used to specify "subsystem" and "category". For mDNSResponder, the subsystem should always
 239  *                          be set to "com.apple.mDNSResponder"; and the category is used for categorization and
 240  *                          filtering of related log messages within the subsystem’s settings. We have 4 categories that
 241  *                          are pre-defined: MDNS_LOG_CATEGORY_DEFAULT, MDNS_LOG_CATEGORY_MDNS, MDNS_LOG_CATEGORY_UDNS,
 242  *                          MDNS_LOG_CATEGORY_SPS. If these categories are not enough, use os_log_create to create more.
 243  *
 244  *  @param LEVEL            The log level that determines the importance of the message. The levels are, in order of
 245  *                          decreasing importance:
 246  *                              MDNS_LOG_FAULT      Fault-level messages are intended for capturing system-level errors
 247  *                                                  that are critical to the system. They are always saved in the data store.
 248  *                              MDNS_LOG_ERROR      Error-level messages are intended for reporting process-level errors
 249  *                                                  that are unexpected and incorrect during the normal operation. They
 250  *                                                  are always saved in the data store.
 251  *                              MDNS_LOG_WARNING    Warning-level messages are intended for capturing unexpected and
 252  *                                                  possible incorrect behavior that might be used later to root cause
 253  *                                                  an error or fault. They are are initially stored in memory buffers
 254  *                                                  and then moved to a data store.
 255  *                              MDNS_LOG_DEFAULT    Default-level messages are intended for reporting things that might
 256  *                                                  result a failure. They are are initially stored in memory buffers
 257  *                                                  and then moved to a data store.
 258  *                              MDNS_LOG_INFO       Info-level messages are intended for capturing information that may
 259  *                                                  be helpful, but isn’t essential, for troubleshooting errors. They
 260  *                                                  are initially stored in memory buffers, but will only be moved into
 261  *                                                  data store when faults and, optionally, errors occur.
 262  *                              MDNS_LOG_DEBUG      Debug-level messages are intended for information that may be useful
 263  *                                                  during development or while troubleshooting a specific problem, Debug
 264  *                                                  logging should not be used in shipping software. They are only
 265  *                                                  captured in memory when debug logging is enabled through a
 266  *                                                  configuration change.
 267  *
 268  *  @param FORMAT           A constant string or format string that produces a human-readable log message. The format
 269  *                          string follows the IEEE printf specification, besides the following customized format specifiers:
 270  *                              %{mdnsresponder:domain_name}.*P     the pointer to a DNS lable sequence
 271  *                              %{mdnsresponder:ip_addr}.20P        the pointer to a mDNSAddr variable
 272  *                              %{network:in_addr}.4P               the pointer to a mDNSv4Addr variable
 273  *                              %{network:in6_addr}.16P             the pointer to a mDNSv6Addr variable
 274  *                              %{mdnsresponder:mac_addr}.6P        the pointer to a 6-byte-length MAC address
 275  *
 276  *  @param ...              The parameter list that will be formated by the format string. Note that if the customized
 277  *                          format specifiers are used and the data length is not specified in the format string, the
 278  *                          size should be listed before the pointer to the data, for example:
 279  *                              "%{mdnsresponder:domain_name}.*P", (name ? (int)DomainNameLength((const domainname *)name) : 0), <the pointer to a DNS label sequence>
 280  *
 281  */
 282     #define LogRedact(CATEGORY, LEVEL, FORMAT, ...) os_log_with_type(CATEGORY, LEVEL, FORMAT, ## __VA_ARGS__)
 283 #else
 284     #if (MDNS_HAS_VA_ARG_MACROS)
 285         #if (MDNS_C99_VA_ARGS)
 286             #define LogRedact(CATEGORY, LEVEL, ...) \
 287                 do { if (mDNS_LoggingEnabled) LogMsgWithLevel(CATEGORY, LEVEL, __VA_ARGS__); } while (0)
 288         #elif (MDNS_GNU_VA_ARGS)
 289             #define LogRedact(CATEGORY, LEVEL, ARGS...) \
 290                 do { if (mDNS_LoggingEnabled) LogMsgWithLevel(CATEGORY, LEVEL, ARGS); } while (0)
 291         #else
 292             #error "Unknown variadic macros"
 293         #endif
 294     #else
 295         #define LogRedact      (mDNS_LoggingEnabled == 0) ? ((void)0) : LogRedact_
 296         extern void LogRedact_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2);
 297     #endif
 298 #endif // MDNSRESPONDER_SUPPORTS(APPLE, OS_LOG)
 299
 300 // The followings are the customized log specifier defined in os_log. For compatibility, we have to define it when it is
 301 // not on the Apple platform, for example, the Posix platform. The keyword "public" or "private" is used to control whether
 302 // the content would be redacted when the redaction is turned on: "public" means the content will always be printed;
 303 // "private" means the content will be printed as <mask.hash: '<The hashed string from binary data>'> if the redaction is turned on,
 304 // only when the redaction is turned off, the content will be printed as what it should be. Note that the hash performed
 305 // to the data is a salted hashing transformation, and the salt is generated randomly on a per-process basis, meaning
 306 // that hashes cannot be correlated across processes or devices.
 307
 308 #if MDNSRESPONDER_SUPPORTS(APPLE, OS_LOG)
 309     #define PUB_S "%{public}s"
 310     #define PRI_S "%{private, mask.hash}s"
 311 #else
 312     #define PUB_S "%s"
 313     #define PRI_S PUB_S
 314 #endif
 315
 316 #if MDNSRESPONDER_SUPPORTS(APPLE, OS_LOG)
 317     #define PUB_DM_NAME "%{public, mdnsresponder:domain_name}.*P"
 318     #define PRI_DM_NAME "%{private, mask.hash, mdnsresponder:domain_name}.*P"
 319     // When DM_NAME_PARAM is used, the file where the function is defined must include DNSEmbeddedAPI.h
 320     #define DM_NAME_PARAM(name) ((name) ? ((int)DomainNameLength((name))) : 0), (name)
 321 #else
 322     #define PUB_DM_NAME "%##s"
 323     #define PRI_DM_NAME PUB_DM_NAME
 324     #define DM_NAME_PARAM(name) (name)
 325 #endif
 326
 327 #if MDNSRESPONDER_SUPPORTS(APPLE, OS_LOG)
 328     #define PUB_IP_ADDR "%{public, mdnsresponder:ip_addr}.20P"
 329     #define PRI_IP_ADDR "%{private, mask.hash, mdnsresponder:ip_addr}.20P"
 330
 331     #define PUB_IPv4_ADDR "%{public, network:in_addr}.4P"
 332     #define PRI_IPv4_ADDR "%{private, mask.hash, network:in_addr}.4P"
 333
 334     #define PUB_IPv6_ADDR "%{public, network:in6_addr}.16P"
 335     #define PRI_IPv6_ADDR "%{private, mask.hash, network:in6_addr}.16P"
 336 #else
 337     #define PUB_IP_ADDR "%#a"
 338     #define PRI_IP_ADDR PUB_IP_ADDR
 339
 340     #define PUB_IPv4_ADDR "%.4a"
 341     #define PRI_IPv4_ADDR PUB_IPv4_ADDR
 342
 343     #define PUB_IPv6_ADDR "%.16a"
 344     #define PRI_IPv6_ADDR PUB_IPv6_ADDR
 345 #endif
 346
 347 #if MDNSRESPONDER_SUPPORTS(APPLE, OS_LOG)
 348     #define PUB_MAC_ADDR "%{public, mdnsresponder:mac_addr}.6P"
 349     #define PRI_MAC_ADDR "%{private, mask.hash, mdnsresponder:mac_addr}.6P"
 350 #else
 351     #define PUB_MAC_ADDR "%.6a"
 352     #define PRI_MAC_ADDR PUB_MAC_ADDR
 353 #endif
 354
 355 #if MDNSRESPONDER_SUPPORTS(APPLE, OS_LOG)
 356     #define PUB_DNSKEY "%{public, mdns:rd.dnskey}.*P"
 357     #define PRI_DNSKEY "%{private, mask.hash, mdns:rd.dnskey}.*P"
 358     #define DNSKEY_PARAM(rdata, rdata_length) (rdata_length), (rdata)
 359 #else
 360     #define PUB_DNSKEY "%p"
 361     #define PRI_DNSKEY PUB_DNSKEY
 362     #define DNSKEY_PARAM(rdata, rdata_length) (rdata)
 363 #endif
 364
 365 #if MDNSRESPONDER_SUPPORTS(APPLE, OS_LOG)
 366     #define PUB_DS "%{public, mdns:rd.ds}.*P"
 367     #define PRI_DS "%{private, mask.hash, mdns:rd.ds}.*P"
 368     #define DS_PARAM(rdata, rdata_length) (rdata_length), (rdata)
 369 #else
 370     #define PUB_DS "%p"
 371     #define PRI_DS PUB_DS
 372     #define DS_PARAM(rdata, rdata_length) (rdata)
 373 #endif
 374
 375 #if MDNSRESPONDER_SUPPORTS(APPLE, OS_LOG)
 376     #define PUB_NSEC "%{public, mdns:rd.nsec}.*P"
 377     #define PRI_NSEC "%{private, mask.hash, mdns:rd.nsec}.*P"
 378     #define NSEC_PARAM(rdata, rdata_length) (rdata_length), (rdata)
 379 #else
 380     #define PUB_NSEC "%p"
 381     #define PRI_NSEC PUB_NSEC
 382     #define NSEC_PARAM(rdata, rdata_length) (rdata)
 383 #endif
 384
 385 #if MDNSRESPONDER_SUPPORTS(APPLE, OS_LOG)
 386     #define PUB_NSEC3 "%{public, mdns:rd.nsec3}.*P"
 387     #define PRI_NSEC3 "%{private, mask.hash, mdns:rd.nsec3}.*P"
 388     #define NSEC3_PARAM(rdata, rdata_length) (rdata_length), (rdata)
 389 #else
 390     #define PUB_NSEC3 "%p"
 391     #define PRI_NSEC3 PUB_NSEC3
 392     #define NSEC3_PARAM(rdata, rdata_length) (rdata)
 393 #endif
 394
 395 #if MDNSRESPONDER_SUPPORTS(APPLE, OS_LOG)
 396     #define PUB_RRSIG "%{public, mdns:rd.rrsig}.*P"
 397     #define PRI_RRSIG "%{private, mask.hash, mdns:rd.rrsig}.*P"
 398     #define RRSIG_PARAM(rdata, rdata_length) (rdata_length), (rdata)
 399 #else
 400     #define PUB_RRSIG "%p"
 401     #define PRI_RRSIG PUB_RRSIG
 402     #define RRSIG_PARAM(rdata, rdata_length) (rdata)
 403 #endif
 404
 405 #if MDNSRESPONDER_SUPPORTS(APPLE, OS_LOG)
 406     #define PUB_SVCB "%{public, mdns:rd.svcb}.*P"
 407     #define PRI_SVCB "%{private, mask.hash, mdns:rd.svcb}.*P"
 408     #define SVCB_PARAM(rdata, rdata_length) (rdata_length), (rdata)
 409 #else
 410     #define PUB_SVCB "%p"
 411     #define PRI_SVCB PUB_SVCB
 412     #define SVCB_PARAM(rdata, rdata_length) (rdata)
 413 #endif
 414
 415 extern void LogToFD(int fd, const char *format, ...);
 416
 417 #endif // __mDNSDebug_h