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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
+<html><head>
+<meta http-equiv="Content-Language" content="en"><title>RainerScript ABNF</title>
+
+</head>
+<body>
+<h1>RainerScript ABNF</h1>
+<p>This is the formal definition of RainerScript, as supported by
+rsyslog configuration. Please note that this currently is working
+document and the actual implementation may be quite different.</p>
+<p>The
+first glimpse of RainerScript will be available as part of rsyslog
+3.12.0 expression support. However, the 3.12. series of rsyslog will
+have a partial script implementaiton, which will not necessariy be
+compatible with the later full implementation. So if you use it, be
+prepared for some config file changes as RainerScript evolves.</p>
+<p>C-like comments (/* some comment */) are supported in all pure
+RainerScript lines. However, legacy-mapped lines do not support them.
+All lines support the hash mark "#" as a comment initiator. Everything
+between the hash and the end of line is a comment (just like // in C++
+and many other languages).</p>
+<h2>Formal Definition</h2>
+<p>Below is the formal language definitionin ABNF (RFC 2234)
+format: <br>
+</p>
+<pre>; <span style="font-weight: bold;">all of this is a working document and may change!</span> -- rgerhards, 2008-02-24<br><br>script := *stmt<br>stmt := (if_stmt / block / vardef / run_s / load_s)<br>vardef := "var" ["scope" = ("global" / "event")] <br>block := "begin" stmt "end"<br>load_s := "load" constraint ("module") modpath params ; load mod only if expr is true<br>run_s := "run" constraint ("input") name<br>constraint:= "if" expr ; constrains some one-time commands<br>modpath := expr<br>params := ["params" *1param *("," param) "endparams"]<br>param := paramname) "=" expr<br>paramname := [*(obqualifier ".") name]<br>modpath:= ; path to module<br>?line? := cfsysline / cfli<br>cfsysline:= BOL "$" *char EOL ; how to handle the first line? (no EOL in front!)<br>BOL := ; Begin of Line - implicitely set on file beginning and after each EOL<br>EOL := 0x0a ;LF<br>if_stmt := "if" expr "then"<br>old_filter:= BOL facility "." severity ; no whitespace allowed between BOL and facility!<br>facility := "*" / "auth" / "authpriv" / "cron" / "daemon" / "kern" / "lpr" / <br> "mail" / "mark" / "news" / "security" / "syslog" / "user" / "uucp" / <br> "local0" .. "local7" / "mark"<br> ; The keyword security should not be used anymore<br> ; mark is just internal<br>severity := TBD ; not really relevant in this context<br><br>; and now the actual expression<br>expr := e_and *("or" e_and)<br>e_and := e_cmp *("and" e_cmp)<br>e_cmp := val 0*1(cmp_op val)<br>val := term *(("+" / "-") term)<br>term := factor *(("*" / "/" / "%") factor)<br>factor := ["not"] ["-"] terminal<br>terminal := var / constant / function / ( "(" expr ")" )<br>function := name "(" *("," expr) ")"<br>var := "$" varname<br>varname := msgvar / sysvar<br>msgvar := name<br>sysvar := "$" name<br>name := alpha *(alnum)<br>constant := string / number<br>string := simpstr / tplstr ; tplstr will be implemented in next phase<br>simpstr := "'" *char "'" ; use your imagination for char ;)<br>tplstr := '"' template '"' ; not initially implemented<br>number := ["-"] 1*digit ; 0nn = octal, 0xnn = hex, nn = decimal<br>cmp_op := "==" / "!=" / "&lt;&gt;" / "&lt;" / "&gt;" / "&lt;=" / "&gt;=" / "contains" / "startswith"<br>digit := %x30-39<br>alpha := "a" ... "z" # all letters<br>alnum :* alpha / digit / "_"<br></pre>
+<h2>Samples</h2>
+<p>Some samples of RainerScript:</p><p>define function IsLinux<br>begin<br>&nbsp; &nbsp; if $environ contains "linux" then return true else return false<br>end</p><p>load if IsLinux() 'imklog.so' params name='klog' endparams /* load klog under linux only */<br>run if IsLinux() input 'klog'<br>load 'ommysql.so'</p><p>if $message contains "error" then<br>&nbsp; action<br>&nbsp;&nbsp;&nbsp; type='ommysql.so', queue.mode='disk', queue.highwatermark = 300,<br>&nbsp; &nbsp; action.dbname='events', action.dbuser='uid',<br>&nbsp; &nbsp; [?action.template='templatename'?] or [?action.sql='insert into table... values('+$facility+','+$severity+...?]<br>&nbsp; endaction<br><br>... or ...</p><p>define action writeMySQL<br>&nbsp;&nbsp;&nbsp; type='ommysql.so', queue.mode='disk', queue.highwatermark = 300,<br>&nbsp; &nbsp; action.dbname='events', action.dbuser='uid',<br>&nbsp; &nbsp; [?action.template='templatename'?] or [?action.sql='insert into table... values('+$facility+','+$severity+...?]<br>&nbsp; &nbsp;endaction</p><p>if $message contains "error" then action writeMySQL</p><p>ALTERNATE APPROACH</p><p>define function IsLinux(<br>&nbsp; &nbsp; if $environ contains "linux" then return true else return false<br>)</p><p>load if IsLinux() 'imklog.so' params name='klog' endparams /* load klog under linux only */<br>run if IsLinux() input 'klog'<br>load 'ommysql.so'</p><p>if $message contains "error" then<br>&nbsp; action(<br>&nbsp;&nbsp;&nbsp; type='ommysql.so', queue.mode='disk', queue.highwatermark = 300,<br>&nbsp; &nbsp; action.dbname='events', action.dbuser='uid',<br>&nbsp; &nbsp; [?action.template='templatename'?] or [?action.sql='insert into table... values('+$facility+','+$severity+...?]<br>&nbsp;&nbsp;)<br><br>... or ...</p><p>define action writeMySQL(<br>&nbsp;&nbsp;&nbsp; type='ommysql.so', queue.mode='disk', queue.highwatermark = 300,<br>&nbsp; &nbsp; action.dbname='events', action.dbuser='uid',<br>&nbsp; &nbsp; [?action.template='templatename'?] or [?action.sql='insert into table... values('+$facility+','+$severity+...?]<br>&nbsp; &nbsp;)</p><p>if $message contains "error" then action writeMySQL(action.dbname='differentDB')</p><p></p><p>[<a href="rsyslog_conf.html">rsyslog.conf overview</a>]
+[<a href="manual.html">manual index</a>] [<a href="http://www.rsyslog.com/">rsyslog site</a>]</p>
+<p><font size="2">This documentation is part of the
+<a href="http://www.rsyslog.com/">rsyslog</a>
+project.<br>
+Copyright © 2008 by <a href="http://www.gerhards.net/rainer">Rainer
+Gerhards</a> and
+<a href="http://www.adiscon.com/">Adiscon</a>.
+Released under the GNU GPL version 3 or higher.</font></p>
+</body></html> \ No newline at end of file