Milestone 5: deliver embedded RDP sessions and lifecycle hardening

third_party/FreeRDP/winpr/libwinpr/utils/wlog/SyslogAppender.c

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+/**
+ * WinPR: Windows Portable Runtime
+ * WinPR Logger
+ *
+ * Copyright © 2015 Thincast Technologies GmbH
+ * Copyright © 2015 David FORT <contact@hardening-consulting.com>
+ *
+ * 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.
+ */
+
+#include <winpr/config.h>
+
+#include "SyslogAppender.h"
+#include <syslog.h>
+
+typedef struct
+{
+	wLogAppender common;
+} wLogSyslogAppender;
+
+static int getSyslogLevel(DWORD level)
+{
+	switch (level)
+	{
+		case WLOG_TRACE:
+		case WLOG_DEBUG:
+			return LOG_DEBUG;
+		case WLOG_INFO:
+			return LOG_INFO;
+		case WLOG_WARN:
+			return LOG_WARNING;
+		case WLOG_ERROR:
+			return LOG_ERR;
+		case WLOG_FATAL:
+			return LOG_CRIT;
+		case WLOG_OFF:
+		default:
+			return -1;
+	}
+}
+
+static BOOL WLog_SyslogAppender_Open(wLog* log, wLogAppender* appender)
+{
+	return !(!log || !appender);
+}
+
+static BOOL WLog_SyslogAppender_Close(wLog* log, wLogAppender* appender)
+{
+	return !(!log || !appender);
+}
+
+static BOOL WLog_SyslogAppender_WriteMessage(wLog* log, wLogAppender* appender,
+                                             const wLogMessage* message)
+{
+	int syslogLevel = 0;
+
+	if (!log || !appender || !message)
+		return FALSE;
+
+	syslogLevel = getSyslogLevel(message->Level);
+	if (syslogLevel >= 0)
+		syslog(syslogLevel, "%s", message->TextString);
+
+	return TRUE;
+}
+
+static BOOL WLog_SyslogAppender_WriteDataMessage(wLog* log, wLogAppender* appender,
+                                                 const wLogMessage* message)
+{
+	int syslogLevel = 0;
+
+	if (!log || !appender || !message)
+		return FALSE;
+
+	syslogLevel = getSyslogLevel(message->Level);
+	if (syslogLevel >= 0)
+		syslog(syslogLevel, "skipped data message of %" PRIuz " bytes", message->Length);
+
+	return TRUE;
+}
+
+static BOOL WLog_SyslogAppender_WriteImageMessage(wLog* log, wLogAppender* appender,
+                                                  const wLogMessage* message)
+{
+	int syslogLevel = 0;
+
+	if (!log || !appender || !message)
+		return FALSE;
+
+	syslogLevel = getSyslogLevel(message->Level);
+	if (syslogLevel >= 0)
+		syslog(syslogLevel, "skipped image (%" PRIuz "x%" PRIuz "x%" PRIuz ")", message->ImageWidth,
+		       message->ImageHeight, message->ImageBpp);
+
+	return TRUE;
+}
+
+static void WLog_SyslogAppender_Free(wLogAppender* appender)
+{
+	free(appender);
+}
+
+wLogAppender* WLog_SyslogAppender_New(WINPR_ATTR_UNUSED wLog* log)
+{
+	wLogSyslogAppender* appender = (wLogSyslogAppender*)calloc(1, sizeof(wLogSyslogAppender));
+	if (!appender)
+		return nullptr;
+
+	appender->common.Type = WLOG_APPENDER_SYSLOG;
+
+	appender->common.Open = WLog_SyslogAppender_Open;
+	appender->common.Close = WLog_SyslogAppender_Close;
+	appender->common.WriteMessage = WLog_SyslogAppender_WriteMessage;
+	appender->common.WriteDataMessage = WLog_SyslogAppender_WriteDataMessage;
+	appender->common.WriteImageMessage = WLog_SyslogAppender_WriteImageMessage;
+	appender->common.Free = WLog_SyslogAppender_Free;
+
+	return &appender->common;
+}