mDNSDebug.h   [plain text]


/* -*- Mode: C; tab-width: 4 -*-
 *
 * Copyright (c) 2002-2003 Apple Computer, 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.
 */

#ifndef __mDNSDebug_h
#define __mDNSDebug_h

// Set MDNS_DEBUGMSGS to 0 to optimize debugf() calls out of the compiled code
// Set MDNS_DEBUGMSGS to 1 to generate normal debugging messages
// Set MDNS_DEBUGMSGS to 2 to generate verbose debugging messages
// MDNS_DEBUGMSGS is normally set in the project options (or makefile) but can also be set here if desired
// (If you edit the file here to turn on MDNS_DEBUGMSGS while you're debugging some code, be careful
// not to accidentally check-in that change by mistake when you check in your other changes.)

//#undef MDNS_DEBUGMSGS
//#define MDNS_DEBUGMSGS 2

// Set MDNS_CHECK_PRINTF_STYLE_FUNCTIONS to 1 to enable extra GCC compiler warnings
// Note: You don't normally want to do this, because it generates a bunch of
// spurious warnings for the following custom extensions implemented by mDNS_vsnprintf:
//    warning: `#' flag used with `%s' printf format    (for %#s              -- pascal string format)
//    warning: repeated `#' flag in format              (for %##s             -- DNS name string format)
//    warning: double format, pointer arg (arg 2)       (for %.4a, %.16a, %#a -- IP address formats)
#define MDNS_CHECK_PRINTF_STYLE_FUNCTIONS 0

typedef enum
{
    MDNS_LOG_MSG,
    MDNS_LOG_OPERATION,
    MDNS_LOG_SPS,
    MDNS_LOG_INFO,
    MDNS_LOG_DEBUG,
} mDNSLogLevel_t;

// Set this symbol to 1 to answer remote queries for our Address, reverse mapping PTR, and HINFO records
#define ANSWER_REMOTE_HOSTNAME_QUERIES 0

// Set this symbol to 1 to do extra debug checks on malloc() and free()
// Set this symbol to 2 to write a log message for every malloc() and free()
//#define MACOSX_MDNS_MALLOC_DEBUGGING 1

//#define ForceAlerts 1
//#define LogTimeStamps 1

// Developer-settings section ends here

#if MDNS_CHECK_PRINTF_STYLE_FUNCTIONS
#define IS_A_PRINTF_STYLE_FUNCTION(F,A) __attribute__ ((format(printf,F,A)))
#else
#define IS_A_PRINTF_STYLE_FUNCTION(F,A)
#endif

#ifdef __cplusplus
extern "C" {
#endif

// Variable argument macro support. Use ANSI C99 __VA_ARGS__ where possible. Otherwise, use the next best thing.

#if (defined(__GNUC__))
    #if ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 2)))
        #define MDNS_C99_VA_ARGS        1
        #define MDNS_GNU_VA_ARGS        0
    #else
        #define MDNS_C99_VA_ARGS        0
        #define MDNS_GNU_VA_ARGS        1
    #endif
    #define MDNS_HAS_VA_ARG_MACROS      1
#elif (_MSC_VER >= 1400) // Visual Studio 2005 and later
    #define MDNS_C99_VA_ARGS            1
    #define MDNS_GNU_VA_ARGS            0
    #define MDNS_HAS_VA_ARG_MACROS      1
#elif (defined(__MWERKS__))
    #define MDNS_C99_VA_ARGS            1
    #define MDNS_GNU_VA_ARGS            0
    #define MDNS_HAS_VA_ARG_MACROS      1
#else
    #define MDNS_C99_VA_ARGS            0
    #define MDNS_GNU_VA_ARGS            0
    #define MDNS_HAS_VA_ARG_MACROS      0
#endif

#if (MDNS_HAS_VA_ARG_MACROS)
    #if (MDNS_C99_VA_ARGS)
        #define debug_noop(... ) ((void)0)
        #define LogMsg(... )           LogMsgWithLevel(MDNS_LOG_MSG, __VA_ARGS__)
        #define LogOperation(... )     do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_OPERATION, __VA_ARGS__);} while (0)
        #define LogSPS(... )           do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_SPS,       __VA_ARGS__);} while (0)
        #define LogInfo(... )          do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_INFO,      __VA_ARGS__);} while (0)
    #elif (MDNS_GNU_VA_ARGS)
        #define debug_noop( ARGS... ) ((void)0)
        #define LogMsg( ARGS... )       LogMsgWithLevel(MDNS_LOG_MSG, ARGS)
        #define LogOperation( ARGS... ) do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_OPERATION, ARGS);} while (0)
        #define LogSPS( ARGS... )       do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_SPS,       ARGS);} while (0)
        #define LogInfo( ARGS... )      do { if (mDNS_LoggingEnabled) LogMsgWithLevel(MDNS_LOG_INFO,      ARGS);} while (0)
    #else
        #error Unknown variadic macros
    #endif
#else
// If your platform does not support variadic macros, you need to define the following variadic functions.
// See mDNSShared/mDNSDebug.c for sample implementation
    #define debug_noop 1 ? (void)0 : (void)
    #define LogMsg LogMsg_
    #define LogOperation (mDNS_LoggingEnabled == 0) ? ((void)0) : LogOperation_
    #define LogSPS       (mDNS_LoggingEnabled == 0) ? ((void)0) : LogSPS_
    #define LogInfo      (mDNS_LoggingEnabled == 0) ? ((void)0) : LogInfo_
extern void LogMsg_(const char *format, ...)       IS_A_PRINTF_STYLE_FUNCTION(1,2);
extern void LogOperation_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2);
extern void LogSPS_(const char *format, ...)       IS_A_PRINTF_STYLE_FUNCTION(1,2);
extern void LogInfo_(const char *format, ...)      IS_A_PRINTF_STYLE_FUNCTION(1,2);
#endif

#if MDNS_DEBUGMSGS
#define debugf debugf_
extern void debugf_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2);
#else
#define debugf debug_noop
#endif

#if MDNS_DEBUGMSGS > 1
#define verbosedebugf verbosedebugf_
extern void verbosedebugf_(const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(1,2);
#else
#define verbosedebugf debug_noop
#endif

extern int mDNS_LoggingEnabled;
extern int mDNS_PacketLoggingEnabled;
extern int mDNS_DebugMode;          // If non-zero, LogMsg() writes to stderr instead of syslog
extern const char ProgramName[];

extern void LogMsgWithLevel(mDNSLogLevel_t logLevel, const char *format, ...) IS_A_PRINTF_STYLE_FUNCTION(2,3);
// LogMsgNoIdent needs to be fixed so that it logs without the ident prefix like it used to
// (or completely overhauled to use the new "log to a separate file" facility)
#define LogMsgNoIdent LogMsg

#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING >= 1
extern void *mallocL(char *msg, unsigned int size);
extern void freeL(char *msg, void *x);
extern void LogMemCorruption(const char *format, ...);
extern void uds_validatelists(void);
extern void udns_validatelists(void *const v);
#else
#define mallocL(X,Y) malloc(Y)
#define freeL(X,Y) free(Y)
#endif

#ifdef __cplusplus
}
#endif

#endif