Optional systemd journal logging

CMakeLists.txt

@@ -19,6 +19,7 @@ option(LINK_SUPPORT "Allow hub linking" OFF)
 option(SSL_SUPPORT "Enable SSL support" ON)
 option(USE_OPENSSL "Use OpenSSL's SSL support" ON )
 option(SQLITE_SUPPORT "Enable SQLite support" ON)
+option(SYSTEMD_SUPPORT "Enable logging to the systemd journal" OFF)
 option(ADC_STRESS "Enable the stress tester client" OFF)
 
 find_package(Git)
@@ -34,6 +35,11 @@ if (SSL_SUPPORT)
 	endif()
 endif()
 
+if (SYSTEMD_SUPPORT)
+        INCLUDE(FindPkgConfig)
+        pkg_search_module(JOURNAL REQUIRED libsystemd-journal)
+endif()
+
 if (MSVC)
 	add_definitions(-D_CRT_SECURE_NO_WARNINGS)
 endif()
@@ -175,6 +181,15 @@ if(SSL_SUPPORT)
 	endif()
 endif()
 
+if (SYSTEMD_SUPPORT)
+        target_link_libraries(uhub ${JOURNAL_LIBRARIES})
+        target_link_libraries(test ${JOURNAL_LIBRARIES})
+        target_link_libraries(uhub-passwd ${JOURNAL_LIBRARIES})
+        target_link_libraries(uhub-admin ${JOURNAL_LIBRARIES})
+        include_directories(${JOURNAL_INCLUDE_DIRS})
+        add_definitions(-DSYSTEMD)
+endif()
+
 configure_file ("${PROJECT_SOURCE_DIR}/version.h.in" "${PROJECT_SOURCE_DIR}/version.h")
 
 mark_as_advanced(FORCE CMAKE_BUILD_TYPE)

src/core/main.c

@@ -216,13 +216,17 @@ void print_usage(char* program)
 		"   -q          Quiet mode - no output\n"
 		"   -f          Fork to background\n"
 		"   -l <file>   Log messages to given file (default: stderr)\n"
-		"   -L          Log messages to syslog\n"
 		"   -c <file>   Specify configuration file (default: " SERVER_CONFIG ")\n"
 		"   -C          Check configuration and return\n"
 		"   -s          Show configuration parameters\n"
 		"   -S          Show configuration parameters, but ignore defaults\n"
 		"   -h          This message\n"
 #ifndef WIN32
+#ifdef SYSTEMD
+		"   -L          Log messages to journal\n"
+#else
+		"   -L          Log messages to syslog\n"
+#endif
 		"   -u <user>   Run as given user\n"
 		"   -g <group>  Run with given group permissions\n"
 		"   -p <file>   Store pid in file (process id)\n"

src/util/log.c

@@ -21,7 +21,15 @@
 #include <locale.h>
 
 #ifndef WIN32
+
+#ifdef SYSTEMD
+#define SD_JOURNAL_SUPPRESS_LOCATION
+#include <systemd/sd-journal.h>
+
+#else
 #include <syslog.h>
+#endif
+
 static int use_syslog = 0;
 #endif
 
@@ -83,7 +91,9 @@ void hub_log_initialize(const char* file, int syslog)
 	if (syslog)
 	{
 		use_syslog = 1;
+                #ifndef SYSTEMD
 		openlog("uhub", LOG_PID, LOG_USER);
+                #endif
 	}
 #endif
 
@@ -132,7 +142,9 @@ void hub_log_shutdown()
 	if (use_syslog)
 	{
 		use_syslog = 0;
+                #ifndef SYSTEMD
 		closelog();
+                #endif
 	}
 #endif
 }
@@ -212,7 +224,12 @@ void hub_log(int log_verbosity, const char *format, ...)
 			case log_fatal:    level = LOG_CRIT; break;
 			case log_error:    level = LOG_ERR; break;
 			case log_warning:  level = LOG_WARNING; break;
-			case log_user:     level = LOG_INFO | LOG_AUTH; break;
+                        #ifdef SYSTEMD
+                        case log_user:     level = LOG_INFO; break;
+
+                        #else
+                        case log_user:     level = LOG_INFO | LOG_AUTH; break;
+                        #endif
 			case log_info:     level = LOG_INFO; break;
 			case log_debug:    level = LOG_DEBUG; break;
 			
@@ -224,8 +241,13 @@ void hub_log(int log_verbosity, const char *format, ...)
 		if (level == 0)
 			return;
 		
+                #ifdef SYSTEMD
+		sd_journal_print(level, "%s", logmsg);
+
+                #else
 		level |= (LOG_USER | LOG_DAEMON);
 		syslog(level, "%s", logmsg);
+                #endif
 	}
 #endif