Contenido Project

Line #	Revision	Author
1	20	ahitrov@rambler.ru	/* ====================================================================
2			* The Apache Software License, Version 1.1
3			*
4			* Copyright (c) 2000 The Apache Software Foundation. All rights
5			* reserved.
6			*
7			* Redistribution and use in source and binary forms, with or without
8			* modification, are permitted provided that the following conditions
9			* are met:
10			*
11			* 1. Redistributions of source code must retain the above copyright
12			* notice, this list of conditions and the following disclaimer.
13			*
14			* 2. Redistributions in binary form must reproduce the above copyright
15			* notice, this list of conditions and the following disclaimer in
16			* the documentation and/or other materials provided with the
17			* distribution.
18			*
19			* 3. The end-user documentation included with the redistribution,
20			* if any, must include the following acknowledgment:
21			* "This product includes software developed by the
22			* Apache Software Foundation (http://www.apache.org/)."
23			* Alternately, this acknowledgment may appear in the software itself,
24			* if and wherever such third-party acknowledgments normally appear.
25			*
26			* 4. The names "Apache" and "Apache Software Foundation" must
27			* not be used to endorse or promote products derived from this
28			* software without prior written permission. For written
29			* permission, please contact apache@apache.org.
30			*
31			* 5. Products derived from this software may not be called "Apache",
32			* nor may "Apache" appear in their name, without prior written
33			* permission of the Apache Software Foundation.
34			*
35			* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36			* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38			* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39			* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41			* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42			* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43			* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44			* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45			* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46			* SUCH DAMAGE.
47			* ====================================================================
48			*
49			* This software consists of voluntary contributions made by many
50			* individuals on behalf of the Apache Software Foundation. For more
51			* information on the Apache Software Foundation, please see
52			* <http://www.apache.org/>.
53			*
54			* Portions of this software are based upon public domain software
55			* originally written at the National Center for Supercomputing Applications,
56			* University of Illinois, Urbana-Champaign.
57			*/
58
59			/* proxy_add_forward module
60			*
61			* This module adds a 'X-Forwarded-For' header to outgoing
62			* proxy requests like Squid does.
63			*
64			* You can then get the client ip back on the "proxied host" by
65			* setting r->connection->remote_ip from this header.
66			*
67			* Ask Bjoern Hansen <ask@netcetera.dk>, October 1998
68
69			* Changes:
70			*
71			* April 12 2000: Changed the license to the ASF 1.1 license.
72			*
73			* April 12 2000: Made it so that we append our IP to an existing
74			* "X-Forwarded-For" line instead of clobbering an
75			* existing one. - <ahosey@systhug.com>
76			*
77			* June 8 1999: Added instructions on how to compile it into the
78			* frontend apache
79			*
80			* April 12 1999: Changed the sample code so it doesn't confuse the
81			* C compiler, ydkhr! Thanks to Mike Whitaker for
82			* noticing.
83			*
84			* March 1 1999: Added sample code on how to use the header with
85			* mod_perl
86			*
87
88			To use the module you have to compile it into the frontend part of
89			your server, I usually copy the module to apache-1.3/src/modules/extra/
90			and use APACI like:
91
92			./configure --prefix=/usr/local/apache \
93			--activate-module=src/modules/extra/mod_proxy_add_forward.c \
94			--enable-module=proxy_add_forward [... more apaci options ...]
95
96			You should also be able to compile and use this module as a
97			dynamically loaded module (DSO).
98
99			TMTOWTDI, but I usually make the 'backend' part of the system
100			something like the following:
101
102			in startup.pl:
103
104			sub My::ProxyRemoteAddr ($) {
105			my $r = shift;
106
107			# we'll only look at the X-Forwarded-For header if the requests
108			# comes from our proxy at localhost
109			return OK unless ($r->connection->remote_ip eq "127.0.0.1");
110
111			if (my ($ip) = $r->header_in('X-Forwarded-For') =~ /([^,\s]+)$/) {
112			$r->connection->remote_ip($ip);
113			}
114
115			return OK;
116			}
117
118			And in httpd.conf:
119
120			PerlPostReadRequestHandler My::ProxyRemoteAddr
121
122			*/
123
124
125			#include "httpd.h"
126			#include "http_config.h"
127			#include "http_core.h"
128
129			module MODULE_VAR_EXPORT proxy_add_forward_module;
130
131			static int add_forward_header(request_rec *r)
132			{
133			const char *oldvalue;
134
135			if (r->proxyreq) {
136			/* If there is an existing header, append our IP to that. */
137			if (oldvalue = ap_table_get(r->headers_in, "X-Forwarded-For")) {
138			ap_table_set(r->headers_in, "X-Forwarded-For",
139			ap_pstrcat(r->pool, oldvalue, ", ",
140			r->connection->remote_ip, NULL));
141			}
142			else {
143			ap_table_set(r->headers_in, "X-Forwarded-For",
144			r->connection->remote_ip);
145			}
146			return OK;
147			}
148			return DECLINED;
149			}
150
151			module MODULE_VAR_EXPORT proxy_add_forward_module = {
152			STANDARD_MODULE_STUFF,
153			NULL, /* initializer */
154			NULL, /* dir config creater */
155			NULL, /* dir merger --- default is to override */
156			NULL, /* server config */
157			NULL, /* merge server configs */
158			NULL, /* command table */
159			NULL, /* handlers */
160			NULL, /* filename translation */
161			NULL, /* check_user_id */
162			NULL, /* check auth */
163			NULL, /* check access */
164			NULL, /* type_checker */
165			add_forward_header, /* fixups */
166			NULL, /* logger */
167			NULL, /* header parser */
168			NULL, /* child_init */
169			NULL, /* child_exit */
170			NULL /* post read-request */
171			};
172
173

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