usyslogd: minor header restructuring/file structure cleanup

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>

1 files changed, 89 insertions, 0 deletions

diff --git a/syslogd/syslogd.h b/syslogd/syslogd.h
new file mode 100644
index 0000000..47fc31c
--- /dev/null
+++ b/syslogd/syslogd.h
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * Copyright (C) 2018 - David Oberhollenzer
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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, see <https://www.gnu.org/licenses/>.
+ */
+#ifndef SYSLOGD_H
+#define SYSLOGD_H
+
+
+#include <sys/types.h>
+#include <time.h>
+
+#include "config.h"
+
+
+#define SYSLOG_SOCKET PREFIXPATH "/dev/log"
+#define SYSLOG_PATH PREFIXPATH "/var/log"
+#define DEFAULT_USER "syslogd"
+#define DEFAULT_GROUP "syslogd"
+
+
+/*
+  encapsulates the split up data from a message received
+  through the local syslog socket.
+ */
+typedef struct {
+	int facility;
+	int level;
+	time_t timestamp;
+	pid_t pid;
+	const char *ident;
+	const char *message;
+} syslog_msg_t;
+
+
+enum {
+	/*
+	  Rotate log data in a way that we still generate a continuous stream
+	  of log data. E.g. in the case of log files, move the current log file
+	  to one suffixed with a timestamp. We don't lose any log data.
+	 */
+	LOG_ROTATE_CONTINUOUS = 0x00,
+
+	/*
+	  Rotate log data by overwriting old data with more recent data.
+	  E.g. in the case of log files, move the current log file to one
+	  with a constant prefix, overwriting any existing data.
+	 */
+	LOG_ROTATE_OVERWRITE = 0x01,
+
+	/*
+	  Automatically do a log rotatation if a log stream reaches a preset
+	  size limit.
+	 */
+	LOG_ROTATE_SIZE_LIMIT = 0x10,
+};
+
+typedef struct log_backend_t {
+	int (*init)(struct log_backend_t *log, int flags, size_t sizelimit);
+
+	void (*cleanup)(struct log_backend_t *log);
+
+	int (*write)(struct log_backend_t *log, const syslog_msg_t *msg);
+
+	void (*rotate)(struct log_backend_t *log);
+} log_backend_t;
+
+
+extern log_backend_t *logmgr;
+
+/*
+  Parse a message string received from the syslog socket and produce
+  a split up representation for the message.
+ */
+int syslog_msg_parse(syslog_msg_t *msg, char *str);
+
+#endif /* LOGFILE_H */