parser.rl
author Mahlon E. Smith <mahlon@laika.com>
Wed, 09 Nov 2011 16:02:57 -0800
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child 22 822094314703
permissions -rw-r--r--
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/* vim: set noet nosta sw=4 ts=4 ft=ragel : */
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/*
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Copyright (c) 2011, Mahlon E. Smith <mahlon@martini.nu>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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    * Redistributions of source code must retain the above copyright
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      notice, this list of conditions and the following disclaimer.
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    * Redistributions in binary form must reproduce the above copyright
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      notice, this list of conditions and the following disclaimer in the
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      documentation and/or other materials provided with the distribution.
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    * Neither the name of Mahlon E. Smith nor the names of his
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      contributors may be used to endorse or promote products derived
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      from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "volta.h"
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#define MARK_S( LBL ) p_parsed->tokens.LBL ## _start = p;
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#define MARK_E( LBL ) p_parsed->tokens.LBL ## _length = p - ( *pe + p_parsed->tokens.LBL ## _start );
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/* 
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 * Tokenize an incoming line from squid, returning a parsed and populated
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 * structure to make redirection decisions against.  This pointer should
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 * be freed using finish_parsed() after use.
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 * 
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 * Squid documentation about redirectors:
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 * ---------------------------------------------------------------------------
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 * TAG: url_rewrite_program
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 * Specify the location of the executable for the URL rewriter.
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 * Since they can perform almost any function there isn't one included.
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 * 
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 * For each requested URL rewriter will receive on line with the format
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 * 
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 * URL <SP> client_ip "/" fqdn <SP> user <SP> method [<SP> kvpairs]<NL>
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 * 
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 * In the future, the rewriter interface will be extended with
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 * key=value pairs ("kvpairs" shown above).  Rewriter programs
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 * should be prepared to receive and possibly ignore additional
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 * whitespace-separated tokens on each input line.
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 * 
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 * And the rewriter may return a rewritten URL. The other components of
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 * the request line does not need to be returned (ignored if they are).
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 * 
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 * The rewriter can also indicate that a client-side redirect should
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 * be performed to the new URL. This is done by prefixing the returned
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 * URL with "301:" (moved permanently) or 302: (moved temporarily).
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 * 
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 * By default, a URL rewriter is not used.
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 * ---------------------------------------------------------------------------
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*/
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parsed *
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parse_request( char *line )
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{
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	/* machine required vars */
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	unsigned short int cs = 1;
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	char *p   = line;
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	char *pe  = p + strlen(p);
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	char *eof = pe;
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	/* the client request pointer */
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	parsed *p_parsed = init_parsed();
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	p_parsed->type   = REQUEST;
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%%{
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	machine request_parser;
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	action channel_id_found  {
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		debug( 1, LOC, "Channel ID found in redirector input.  Set 'url_rewrite_concurrency' to '0' in squid.\n" );
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		fbreak;
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	}
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	action scheme_start  { MARK_S(scheme) }
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	action scheme_finish { MARK_E(scheme) }
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	action host_start    { MARK_S(host) }
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	action host_finish   { MARK_E(host) }
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	action port_start    { p_parsed->tokens.port_start = p+1; } # strip leading colon
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	action port_finish   { MARK_E(port) }
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	action path_start    { MARK_S(path) }
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	action path_finish   { MARK_E(path) }
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	action meth_start    { MARK_S(meth) }
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	action meth_finish   { MARK_E(meth) }
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	action c_ip_start    { MARK_S(c_ip) }
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	action c_ip_finish   { MARK_E(c_ip) }
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	action host_error   { debug( 3, LOC, "Unable to parse the request hostname.\n" ); }
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	action scheme_error { debug( 3, LOC, "Unable to parse the request scheme.\n" ); }
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	action meth_error   { debug( 3, LOC, "Unable to parse the request method.\n" ); }
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	action c_ip_error   { debug( 3, LOC, "Unable to parse the client IP address.\n" ); }
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	# 
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	# Squid line: URL <SP> client_ip "/" fqdn <SP> user <SP> method [<SP> kvpairs]<NL>
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	# 
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	# URI Syntax (RFC 3986) misc notes:
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	#
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	# - Scheme isn't passed to redirectors on CONNECT method requests
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	#
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	# - Hostname segments aren't supposed to be individually greater than 63 chars,
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	#   and the hostname in total shouldn't exceed 255.  They also shouldn't be entirely
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	#   made up of digits, or contain underscores.  In practice, these rules appear to
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	#   be violated constantly by some pretty big sites.
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	#   (( alnum ) | ( alnum . [a-zA-Z0-9\-]{0,63} . alnum )) & !( digit+ );
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	#
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	# - ipv6 has some utterly insane rules (RFC 5952) in the name of "shortcuts", which
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	#   only seem like shortcuts to someone writing IP addresses by hand.  Anyone that
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	#   has to parse (or even just read) them has a bunch of seemingly arbitrary work
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	#   dumped in their lap.  Heck, it's impossible to even search for an ipv6 address
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	#   that contains zeros in a text editor, because you have no idea what how it might
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	#   be represented.  Rad!
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	#
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	#   The parser just trusts any ipv6 squid hands us as being valid, without
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	#   any real parsing/validation, other than it consists of hex digits and colons.
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	#
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	# - This parser originally validated path/query/fragment as well, but there were
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	#   enough inconsistencies with unescaped chars and other real-life RFC deviations
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   130
	#   that I opted to just accept what we get from squid.
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	#
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	# - Redirectors aren't handed any userinfo (http://mahlon:password@example.com),
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	#   so no need to check for that.
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	#
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   135
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	host_component = alnum | ( alnum [a-zA-Z0-9\-_]* alnum );
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	pchar          = ( alnum | [\-._~!$%&'()*+,;=] );
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	path_segment   = '/' ( any - space )*;
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   139
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	hostname       = host_component ( '.' host_component )* '.'?;
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	ipv4           = digit{1,3} '.' digit{1,3} '.' digit{1,3} '.' digit{1,3};
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	ipv6           = ( xdigit | ':' )+;
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   143
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	channel_id     = ( digit+ space )      %channel_id_found;
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	scheme         = ( alpha{3,5} '://' )  >scheme_start %scheme_finish @!scheme_error;
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	host           = ( hostname | ipv4 )   >host_start   %host_finish   @!host_error;
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	port           = ( ':' digit{1,5} )    >port_start   %port_finish;
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	path           = path_segment*         >path_start   %path_finish;
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	client_ip      = ipv4                  >c_ip_start   %c_ip_finish   @!c_ip_error;
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	method         = upper+                >meth_start   %meth_finish   @!meth_error;
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	URL = (
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		start:   channel_id?                            -> Url,
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		Url:     scheme? host port? path?               -> final
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 	);
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	Squidvars = (
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		start:
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		Client:  space client_ip '/' ( hostname | '-' ) -> User,
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		User:    space pchar+                           -> Method,
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		Method:  space method                           -> KVPairs,
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		KVPairs: ( space any+ )?                        -> final
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 	);
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	main := URL Squidvars? '\n';
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}%%
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   167
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	/* state machine */
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	%% write exec;
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	/* If we were given an invalid line, bail early */
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	if ( cs < %%{ write first_final; }%% ) {
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		free( p_parsed ), p_parsed = NULL;
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		debug( 3, LOC, "Invalid request line (%d), skipped\n", v.timer.lines + 1 );
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		debug( 4, LOC, "%s", line );
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		return( NULL );
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	}
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	debug( 6, LOC, "%s", line );
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	(void)populate_parsed( p_parsed );
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	return( p_parsed );
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}
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   183
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/*
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 * Tokenize a value string from a successful database lookup, returning a parsed
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 * and populated structure. This pointer should be freed using finish_parsed() after use.
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 *
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 */
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parsed *
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parse_rule( char *rewrite )
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{
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	/* machine required vars */
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	unsigned short int cs = 1;
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	char *p   = rewrite;
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	char *pe  = p + strlen(p);
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	char *eof = pe;
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   198
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	/* the client rule pointer */
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	parsed *p_parsed = init_parsed();
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	p_parsed->type   = RULE;
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   202
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%%{
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	machine rule_parser;
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	action match_start   { MARK_S(path_re) }
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	action match_finish  { MARK_E(path_re) }
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	action redir_start   { MARK_S(redir) }
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	action redir_finish  { p_parsed->tokens.redir_length = 3; } # strip trailing colon
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	action negate_finish { p_parsed->negate = 1; }
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   211
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	action scheme_start  { MARK_S(scheme) }
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	action scheme_finish { MARK_E(scheme) }
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	action host_start    { MARK_S(host) }
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	action host_finish   { MARK_E(host) }
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	action port_start    { p_parsed->tokens.port_start = p+1; } # strip leading colon
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	action port_finish   { MARK_E(port) }
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	action path_start    { MARK_S(path) }
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	action path_finish   { MARK_E(path) }
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   220
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	action match_error { debug( 3, LOC, "Unable to parse the rule path matcher.\n" ); }
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	action host_error  { debug( 3, LOC, "Unable to parse the rule hostname.\n" ); }
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   223
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	host_component  = alnum | ( alnum [a-zA-Z0-9\-_]* alnum );
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	path_segment    = '/' ( any - space )*;
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   226
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	sep       = space+;
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	hostname  = host_component ( '.' host_component )* '.'?;
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	ipv4      = digit{1,3} '.' digit{1,3} '.' digit{1,3} '.' digit{1,3};
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	ipv6      = ( xdigit | ':' )+;
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   231
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	negate    = ( '-' )                 %negate_finish;
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	path_re   = ( any - space )+        >match_start  %match_finish @!match_error;
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   234
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	redir     = ( ('301' | '302') ':' ) >redir_start  %redir_finish;
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	scheme    = ( alpha{3,5} '://' )    >scheme_start %scheme_finish;
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	host      = ( hostname | ipv4 )     >host_start   %host_finish   @!host_error;
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	port      = ( ':' digit{1,5} )      >port_start   %port_finish;
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	path      = path_segment*           >path_start   %path_finish;
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	rewrite   = ( redir? scheme? host port? path? );
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	main := path_re sep ( rewrite | negate );
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}%%
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   245
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	/* state machine */
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	%% write exec;
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	/* If we were given an invalid rule, bail early */
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	if ( cs < %%{ write first_final; }%% ) {
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		free( p_parsed ), p_parsed = NULL;
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		debug( 3, LOC, "Invalid rule\n" );
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		debug( 4, LOC, "%s\n", rewrite );
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		return( NULL );
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	}
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   256
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	(void)populate_parsed( p_parsed );
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	return( p_parsed );
0
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}
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/*
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 * Tokenize a line from an ascii representation of the database, returning
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 * a pointer to a parsed struct.  Used for creation of a new cdb file,
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 * validating data prior to use.
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 *
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 */
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struct db_input *
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parse_dbinput( char *line )
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{
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	/* machine required vars */
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	unsigned short int cs = 1;
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	char *p   = line;
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	char *pe  = p + strlen(p);
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	char *eof = pe;
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	/* the db line input pointer */
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	struct db_input *dbline = NULL;
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	if ( (dbline = malloc( sizeof(struct db_input) )) == NULL ) {
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		debug( 5, LOC, "Unable to allocate memory for db input: %s\n", strerror(errno) );
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		return( NULL );
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	}
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	dbline->klen   = 0;
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	dbline->vlen   = 0;
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	dbline->kstart = NULL;
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	dbline->key    = NULL;
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	dbline->vstart = NULL;
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	dbline->val    = NULL;
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   289
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%%{
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	machine dbinput_parser;
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   292
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	action key_start  { dbline->kstart = p; }
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	action key_finish { dbline->klen = p - ( *pe + dbline->kstart ); }
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	action key_error  { debug( 0, LOC, "Invalid key format\n" ); }
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	action val_start  { dbline->vstart = p; }
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	action val_finish { dbline->vlen = p - ( *pe + dbline->vstart ); }
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	action val_error  { debug( 0, LOC, "Invalid rewrite value\n" ); }
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	sep            = space+;
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	host_component = alnum | ( alnum [a-zA-Z0-9\-_]* alnum );
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	hostname       = host_component ( '.' host_component )* '.'?;
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	ipv4           = digit{1,3} '.' digit{1,3} '.' digit{1,3} '.' digit{1,3};
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	token          = ( any - space )+;
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	redir          = ( digit{3} ':' );
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	host           = ( hostname | ipv4 );
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   307
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	key = ( host | '*' )      >key_start %key_finish @!key_error;
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	val = ( token sep token ) >val_start %val_finish @!val_error;
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	#       regex     rewrite or negate
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	main:= key sep val '\n';
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   313
}%%
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   314
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	/* state machine */
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   316
	%% write exec;
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   317
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	/* If the input line was invalid, bail early */
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   319
	if ( cs < %%{ write first_final; }%% ) {
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   320
		free( dbline ), dbline = NULL;
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   321
		return( NULL );
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   322
	}
12
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diff changeset
   323
14
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	/* populate struct */
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   325
	dbline->key = copy_string_token( dbline->kstart, dbline->klen );
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   326
	dbline->val = copy_string_token( dbline->vstart, dbline->vlen );
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diff changeset
   327
14
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   328
	/* check the val to make sure it is a valid rewrite rule */
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   329
	parsed *valstr = NULL;
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   330
	valstr = parse_rule( dbline->val );
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diff changeset
   331
	if ( valstr == NULL ) {
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   332
		free( dbline->key );
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   333
		free( dbline->val );
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   334
		free( dbline );
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		return( NULL );
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   336
	}
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   337
	finish_parsed( valstr );
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   338
14
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   339
	return( dbline );
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   340
}
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   341
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diff changeset
   342
14
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diff changeset
   343
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   344
/*
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   345
 * Initialize and return a pointer to a new parser object.
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   346
 *
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   347
 */
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   348
parsed *
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   349
init_parsed( void )
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   350
{
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diff changeset
   351
	parsed *p_parsed = NULL;
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   352
	if ( (p_parsed = malloc( sizeof(parsed) )) == NULL ) {
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   353
		debug( 5, LOC, "Unable to allocate memory for parsed struct: %s\n", strerror(errno) );
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   354
		return( NULL );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   355
	}
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   356
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   357
	p_parsed->type      = 0;
18
d4ce82194b64 - 1st pass at documentation with the README.
Mahlon E. Smith <mahlon@laika.com>
parents: 15
diff changeset
   358
	p_parsed->negate    = 0;
14
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   359
	p_parsed->path_re   = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   360
	p_parsed->redir     = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   361
	p_parsed->scheme    = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   362
	p_parsed->host      = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   363
	p_parsed->tld       = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   364
	p_parsed->port      = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   365
	p_parsed->path      = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   366
	p_parsed->user      = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   367
	p_parsed->method    = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   368
	p_parsed->client_ip = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   369
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   370
	p_parsed->tokens.path_re_start  = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   371
	p_parsed->tokens.redir_start    = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   372
	p_parsed->tokens.scheme_start   = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   373
	p_parsed->tokens.host_start     = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   374
	p_parsed->tokens.port_start     = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   375
	p_parsed->tokens.path_start     = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   376
	p_parsed->tokens.meth_start     = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   377
	p_parsed->tokens.c_ip_start     = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   378
	p_parsed->tokens.path_re_length = 0;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   379
	p_parsed->tokens.redir_length   = 0;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   380
	p_parsed->tokens.scheme_length  = 0;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   381
	p_parsed->tokens.host_length    = 0;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   382
	p_parsed->tokens.port_length    = 0;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   383
	p_parsed->tokens.path_length    = 0;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   384
	p_parsed->tokens.meth_length    = 0;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   385
	p_parsed->tokens.c_ip_length    = 0;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   386
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   387
	return p_parsed;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   388
}
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   389
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   390
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   391
/*
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   392
 * Release memory used by the parsed struct.
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   393
 *
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   394
 */
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   395
void
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   396
finish_parsed( parsed *p_parsed )
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   397
{
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   398
	if ( p_parsed == NULL ) return;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   399
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   400
	free( p_parsed->scheme );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   401
	free( p_parsed->host );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   402
	free( p_parsed->path );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   403
	free( p_parsed->port );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   404
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   405
	if ( p_parsed->type == REQUEST ) {
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   406
		free( p_parsed->tld );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   407
		free( p_parsed->method );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   408
		free( p_parsed->client_ip );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   409
	}
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   410
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   411
	if ( p_parsed->type == RULE ) {
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   412
		free( p_parsed->path_re );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   413
		free( p_parsed->redir );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   414
	}
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   415
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   416
	free( p_parsed ), p_parsed = NULL;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   417
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   418
	return;
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   419
}
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   420
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   421
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   422
#define COPY_STR( LBL ) copy_string_token( p_parsed->tokens.LBL ## _start, p_parsed->tokens.LBL ## _length )
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   423
/* #define COPY_IP4( LBL ) copy_ipv4_token(   p_request->tokens.LBL ## _start, p_request->tokens.LBL ## _length ) */
12
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   424
10
d07309450285 Get the ragel line parser properly tokenizing the input lines. Add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 2
diff changeset
   425
/*
d07309450285 Get the ragel line parser properly tokenizing the input lines. Add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 2
diff changeset
   426
 * Take the previously parsed token locations and copy them into the request struct.
d07309450285 Get the ragel line parser properly tokenizing the input lines. Add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 2
diff changeset
   427
 *
d07309450285 Get the ragel line parser properly tokenizing the input lines. Add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 2
diff changeset
   428
 */
d07309450285 Get the ragel line parser properly tokenizing the input lines. Add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 2
diff changeset
   429
void
14
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   430
populate_parsed( parsed *p_parsed )
10
d07309450285 Get the ragel line parser properly tokenizing the input lines. Add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 2
diff changeset
   431
{
14
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   432
	p_parsed->scheme = COPY_STR( scheme );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   433
	p_parsed->host   = COPY_STR( host );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   434
	p_parsed->path   = COPY_STR( path );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   435
	p_parsed->port   = COPY_STR( port );
13
23a242d7b7fa 1st iteration of volta actually doing something. Process the request,
Mahlon E. Smith <mahlon@laika.com>
parents: 12
diff changeset
   436
14
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   437
	if ( p_parsed->type == REQUEST ) {
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   438
		p_parsed->method    = COPY_STR( meth );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   439
		p_parsed->client_ip = COPY_STR( c_ip );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   440
		/* p_request->client_ip = COPY_IP4( c_ip ); */
13
23a242d7b7fa 1st iteration of volta actually doing something. Process the request,
Mahlon E. Smith <mahlon@laika.com>
parents: 12
diff changeset
   441
14
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   442
		(void)lowercase_str( p_parsed->host, p_parsed->tokens.host_length );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   443
		(void)parse_tld( p_parsed );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   444
	}
13
23a242d7b7fa 1st iteration of volta actually doing something. Process the request,
Mahlon E. Smith <mahlon@laika.com>
parents: 12
diff changeset
   445
14
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   446
	if ( p_parsed->type == RULE ) {
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   447
		p_parsed->path_re = COPY_STR( path_re );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   448
		p_parsed->redir   = COPY_STR( redir );
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   449
	}
10
d07309450285 Get the ragel line parser properly tokenizing the input lines. Add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 2
diff changeset
   450
d07309450285 Get the ragel line parser properly tokenizing the input lines. Add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 2
diff changeset
   451
	return;
d07309450285 Get the ragel line parser properly tokenizing the input lines. Add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 2
diff changeset
   452
}
d07309450285 Get the ragel line parser properly tokenizing the input lines. Add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 2
diff changeset
   453
d07309450285 Get the ragel line parser properly tokenizing the input lines. Add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 2
diff changeset
   454
d07309450285 Get the ragel line parser properly tokenizing the input lines. Add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 2
diff changeset
   455
/*
12
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   456
 * Pull the top level domain out of the requested hostname.
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   457
 *
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   458
 */
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   459
void
14
51eb85ae4de4 There isn't a fast way to look up ( value exists or null ) for every
Mahlon E. Smith <mahlon@martini.nu>
parents: 13
diff changeset
   460
parse_tld( parsed *p_request )
12
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   461
{
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   462
	unsigned short int cs = 5, mark = 0;
15
2706fc514dea Add whitelisting rules, to negate other matches if they come first in
Mahlon E. Smith <mahlon@martini.nu>
parents: 14
diff changeset
   463
	char *p  = p_request->host;
2706fc514dea Add whitelisting rules, to negate other matches if they come first in
Mahlon E. Smith <mahlon@martini.nu>
parents: 14
diff changeset
   464
	char *pe = p + p_request->tokens.host_length;
2706fc514dea Add whitelisting rules, to negate other matches if they come first in
Mahlon E. Smith <mahlon@martini.nu>
parents: 14
diff changeset
   465
	char *ts = 0, *te = 0, *eof = pe;
12
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   466
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   467
%%{
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   468
    machine tld_parser;
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   469
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   470
	host_component = alnum | ( alnum [a-zA-Z0-9\-_]* alnum );
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   471
	tld = ( host_component '.' host_component );
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   472
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   473
	main := |*
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   474
		tld => { mark = ( p_request->tokens.host_length - (int)strlen(te) ); };
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   475
	*|;
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
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diff changeset
   476
}%%
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   477
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   478
	/* It's far easier (and faster) to scan from left to right rather than
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   479
	   backtrack, so start by reversing the requested host string. */
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   480
	reverse_str( p_request->host );
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   481
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   482
	/* scanner */
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   483
	%% write exec;
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   484
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   485
	/* If there was a mark, then allocate memory and copy. */
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   486
	if ( mark != 0 ) {
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   487
		if ( (p_request->tld = calloc( mark + 1, sizeof(char) )) == NULL ) {
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   488
			debug( 5, LOC, "Unable to allocate memory for tld token: %s\n", strerror(errno) );
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   489
			reverse_str( p_request->host );
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   490
			return;
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Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   491
		}
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   492
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   493
		memcpy( p_request->tld, p_request->host, mark );
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   494
		reverse_str( p_request->tld );
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   495
	}
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   496
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   497
	/* restore the hostname. */
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   498
	reverse_str( p_request->host );
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   499
	return;
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   500
}
191b3c25974a Clean up redundant parser actions via preprocessor macros, add a
Mahlon E. Smith <mahlon@martini.nu>
parents: 10
diff changeset
   501