1 files changed, 96 insertions, 0 deletions
diff --git a/dolog.cc b/dolog.cc
new file mode 100644
index 0000000..55a92b8
--- /dev/null
+++ b/dolog.cc
@@ -0,0 +1,96 @@
+/*
+ * This file is part of PowerDNS or dnsdist.
+ * Copyright -- PowerDNS.COM B.V. and its contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * In addition, for the avoidance of any doubt, permission is granted to
+ * link this program with OpenSSL and to (re)distribute the binaries
+ * produced as the result of such linking.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <mutex>
+#include <sys/time.h>
+
+#include "dolog.hh"
+
+namespace dnsdist::logging
+{
+std::optional<std::ofstream> LoggingConfiguration::s_verboseStream{std::nullopt};
+std::string LoggingConfiguration::s_structuredLevelPrefix{"prio"};
+LoggingConfiguration::TimeFormat LoggingConfiguration::s_structuredTimeFormat{LoggingConfiguration::TimeFormat::Numeric};
+bool LoggingConfiguration::s_structuredLogging{false};
+bool LoggingConfiguration::s_logTimestamps{false};
+bool LoggingConfiguration::s_syslog{false};
+
+namespace
+{
+  const char* getTimeFormat()
+  {
+    if (!dnsdist::logging::LoggingConfiguration::getStructuredLogging()) {
+      return "%b %d %H:%M:%S ";
+    }
+
+    auto format = dnsdist::logging::LoggingConfiguration::getStructuredLoggingTimeFormat();
+    if (format == dnsdist::logging::LoggingConfiguration::TimeFormat::ISO8601) {
+      return "%FT%H:%M:%S%z";
+    }
+    return nullptr;
+  }
+}
+
+void logTime(std::ostream& stream)
+{
+  std::array<char, 50> buffer{""};
+
+  if (LoggingConfiguration::getStructuredLogging() && LoggingConfiguration::getStructuredLoggingTimeFormat() == LoggingConfiguration::TimeFormat::Numeric) {
+    struct timeval now
+    {
+    };
+    gettimeofday(&now, nullptr);
+    snprintf(buffer.data(), buffer.size(), "%lld.%03ld", static_cast<long long>(now.tv_sec), static_cast<long>(now.tv_usec / 1000));
+  }
+  else {
+    const auto* timeFormat = getTimeFormat();
+    if (timeFormat == nullptr) {
+      return;
+    }
+
+    time_t now{0};
+    time(&now);
+    struct tm localNow
+    {
+    };
+    localtime_r(&now, &localNow);
+
+    {
+      // strftime is not thread safe, it can access locale information
+      static std::mutex mutex;
+      auto lock = std::lock_guard(mutex);
+
+      if (strftime(buffer.data(), buffer.size(), timeFormat, &localNow) == 0) {
+        buffer[0] = '\0';
+      }
+    }
+  }
+
+  if (dnsdist::logging::LoggingConfiguration::getStructuredLogging()) {
+    stream << "ts=" << std::quoted(buffer.data()) << " ";
+  }
+  else {
+    stream << buffer.data();
+  }
+}
+
+}