xref: /illumos-gate/usr/src/contrib/mDNSResponder/mDNSShared/mDNSDebug.c (revision 472cd20d26008f77084ade4c2048159b98c2b705)
1 /*
2  * Copyright (c) 2003-2019 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 #include <stdio.h>
18 
19 #if defined(WIN32) || defined(EFI32) || defined(EFI64) || defined(EFIX64)
20 // Need to add Windows/EFI syslog support here
21 #define LOG_PID 0x01
22 #define LOG_CONS 0x02
23 #define LOG_PERROR 0x20
24 #else
25 #include <syslog.h>
26 #endif
27 
28 #include "mDNSEmbeddedAPI.h"
29 
30 mDNSexport int mDNS_LoggingEnabled       = 0;
31 mDNSexport int mDNS_PacketLoggingEnabled = 0;
32 mDNSexport int mDNS_McastLoggingEnabled  = 0;
33 mDNSexport int mDNS_McastTracingEnabled  = 0;
34 
35 #if MDNS_DEBUGMSGS
36 mDNSexport int mDNS_DebugMode = mDNStrue;
37 #else
38 mDNSexport int mDNS_DebugMode = mDNSfalse;
39 #endif
40 
41 // Note, this uses mDNS_vsnprintf instead of standard "vsnprintf", because mDNS_vsnprintf knows
42 // how to print special data types like IP addresses and length-prefixed domain names
43 #if MDNS_DEBUGMSGS > 1
verbosedebugf_(const char * format,...)44 mDNSexport void verbosedebugf_(const char *format, ...)
45 {
46     char buffer[512];
47     va_list args;
48     va_start(args, format);
49     buffer[mDNS_vsnprintf(buffer, sizeof(buffer), format, args)] = 0;
50     va_end(args);
51     mDNSPlatformWriteDebugMsg(buffer);
52 }
53 #endif
54 
55 // Log message with default "mDNSResponder" ident string at the start
56 #if MDNSRESPONDER_SUPPORTS(APPLE, OS_LOG)
LogMsgWithLevelv(os_log_t category,os_log_type_t level,const char * format,va_list args)57 mDNSlocal void LogMsgWithLevelv(os_log_t category, os_log_type_t level, const char *format, va_list args)
58 {
59     char buffer[512];
60     mDNS_vsnprintf(buffer, (mDNSu32)sizeof(buffer), format, args);
61     os_log_with_type(category ? category : mDNSLogCategory_Default, level, "%{private}s", buffer);
62 }
63 #else
LogMsgWithLevelv(const char * category,mDNSLogLevel_t level,const char * format,va_list args)64 mDNSlocal void LogMsgWithLevelv(const char *category, mDNSLogLevel_t level, const char *format, va_list args)
65 {
66     char buffer[512];
67     char *dst = buffer;
68     const char *const lim = &buffer[512];
69     if (category) mDNS_snprintf_add(&dst, lim, "%s: ", category);
70     mDNS_vsnprintf(dst, (mDNSu32)(lim - dst), format, args);
71     mDNSPlatformWriteLogMsg(ProgramName, buffer, level);
72 }
73 #endif
74 
75 #define LOG_HELPER_BODY(CATEGORY, LEVEL) \
76     { \
77         va_list args; \
78         va_start(args,format); \
79         LogMsgWithLevelv(CATEGORY, LEVEL, format, args); \
80         va_end(args); \
81     }
82 
83 // see mDNSDebug.h
84 #if !MDNS_HAS_VA_ARG_MACROS
LogMsg_(const char * format,...)85 void LogMsg_(const char *format, ...)       LOG_HELPER_BODY(NULL, MDNS_LOG_INFO)
86 void LogOperation_(const char *format, ...) LOG_HELPER_BODY(NULL, MDNS_LOG_INFO)
87 void LogSPS_(const char *format, ...)       LOG_HELPER_BODY(NULL, MDNS_LOG_INFO)
88 void LogInfo_(const char *format, ...)      LOG_HELPER_BODY(NULL, MDNS_LOG_INFO)
89 void LogDebug_(const char *format, ...)     LOG_HELPER_BODY(NULL, MDNS_LOG_DEBUG)
90 #endif
91 
92 #if MDNS_DEBUGMSGS
93 void debugf_(const char *format, ...)       LOG_HELPER_BODY(MDNS_LOG_DEBUG)
94 #endif
95 
96 // Log message with default "mDNSResponder" ident string at the start
97 mDNSexport void LogMsgWithLevel(mDNSLogCategory_t category, mDNSLogLevel_t level, const char *format, ...)
98 LOG_HELPER_BODY(category, level)
99 
100 mDNSexport void LogToFD(int fd, const char *format, ...)
101 {
102     va_list args;
103     va_start(args, format);
104 #if APPLE_OSX_mDNSResponder
105     char buffer[1024];
106     buffer[mDNS_vsnprintf(buffer, (mDNSu32)sizeof(buffer), format, args)] = '\0';
107     dprintf(fd, "%s\n", buffer);
108 #else
109     (void)fd;
110     LogMsgWithLevelv(NULL, MDNS_LOG_INFO, format, args);
111 #endif
112     va_end(args);
113 }
114