Added lib/logger.php (copied from tftpserver.php, so that it can be reused for that).

Signed-off-by: Diederik de Groot <ddegroot@talon.nl>

lib/logger.php

@@ -0,0 +1,94 @@
+<?php
+/* Note about the Logger class:
+ * The "priority" and "minimum should be one of the constants used for syslog.
+ * See: http://php.net/manual/en/function.syslog.php
+ * They are: LOG_EMERG, LOG_ALERT, LOG_CRIT, LOG_ERR, LOG_WARNING, LOG_NOTICE,
+ * 	     LOG_INFO, LOG_DEBUG
+ * Note that LOG_EMERG, LOG_ALERT, and LOG_CRIT are not really relevant to a
+ * tftp server - these represent instability in the entire operating system.
+ * Note that the number they are represented by are in reverse order -
+ * LOG_EMERG is the lowest, LOG_DEBUG the highest.
+ */
+abstract class Logger
+{
+	function __construct($minimum)
+	{
+		$this->minimum = $minimum;
+	}
+
+	function shouldlog($priority)
+	{
+		// Note: this looks reversed, but is correct
+		// the priority must be AT LEAST the minimum,
+		// because higher priorities represent lower numbers.
+		return $priority <= $this->minimum;
+	}
+
+	abstract function log($priority, $message);
+}
+
+class Logger_Null extends Logger
+{
+	function log($priority, $message)
+	{
+	}
+}
+
+class Logger_Syslog extends Logger
+{
+	function log($priority, $message)
+	{
+		if($this->shouldlog($priority))
+			syslog($priority,$message);
+	}
+}
+
+class Logger_Filehandle extends Logger
+{
+	private $priority_map = array(
+		LOG_DEBUG => "D",
+		LOG_INFO => "I",
+		LOG_NOTICE => "N",
+		LOG_WARNING => "W",
+		LOG_ERR => "E",
+		LOG_CRIT => "C",
+		LOG_ALERT => "A",
+		LOG_EMERG => "!"
+	);
+	function __construct($minimum, $filehandle, $dateformat = "r")
+	{
+		$this->filehandle = $filehandle;
+		$this->dateformat = $dateformat;
+		return parent::__construct($minimum);
+	}
+
+	function log($priority, $message)
+	{
+		if($this->shouldlog($priority))
+			fwrite($this->filehandle, date($this->dateformat) . ": " . $this->priority_map[$priority] . " $message\n");
+	}
+}
+
+class Logger_Filename extends Logger_Filehandle
+{
+	function __construct($minimum, $filename, $dateformat = "r")
+	{
+		return parent::__construct($minimum, fopen($filename, "a"), $dateformat);
+	}
+}
+
+class Logger_Stderr extends Logger_Filehandle
+{
+	function __construct($minimum, $dateformat = "r")
+	{
+		return parent::__construct($minimum, STDERR, $dateformat);
+	}
+}
+class Logger_Stdout extends Logger_Filehandle
+{
+	function __construct($minimum, $dateformat = "r")
+	{
+		return parent::__construct($minimum, STDOUT, $dateformat);
+	}
+}
+?>