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b31bec2fe9
proxy_http.c:866: warning: suggest parentheses around assignment used as truth value git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@96983 13f79535-47bb-0310-9956-ffa450edef68
1142 lines
45 KiB
C
1142 lines
45 KiB
C
/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2000-2002 The Apache Software Foundation. All rights
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* reserved.
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*
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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
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* are met:
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*
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* 1. 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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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" must
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* not be used to endorse or promote products derived from this
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* software without prior written permission. For written
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* permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* nor may "Apache" appear in their name, without prior written
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* permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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* Portions of this software are based upon public domain software
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* originally written at the National Center for Supercomputing Applications,
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* University of Illinois, Urbana-Champaign.
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*/
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/* HTTP routines for Apache proxy */
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#include "mod_proxy.h"
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module AP_MODULE_DECLARE_DATA proxy_http_module;
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int ap_proxy_http_canon(request_rec *r, char *url);
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int ap_proxy_http_handler(request_rec *r, proxy_server_conf *conf,
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char *url, const char *proxyname,
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apr_port_t proxyport);
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typedef struct {
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const char *name;
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apr_port_t port;
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apr_sockaddr_t *addr;
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apr_socket_t *sock;
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int close;
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} proxy_http_conn_t;
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static apr_status_t ap_proxy_http_cleanup(request_rec *r,
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proxy_http_conn_t *p_conn,
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proxy_conn_rec *backend);
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/*
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* Canonicalise http-like URLs.
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* scheme is the scheme for the URL
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* url is the URL starting with the first '/'
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* def_port is the default port for this scheme.
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*/
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int ap_proxy_http_canon(request_rec *r, char *url)
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{
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char *host, *path, *search, sport[7];
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const char *err;
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const char *scheme;
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apr_port_t port, def_port;
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/* ap_port_of_scheme() */
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if (strncasecmp(url, "http:", 5) == 0) {
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url += 5;
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scheme = "http";
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}
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else if (strncasecmp(url, "https:", 6) == 0) {
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url += 6;
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scheme = "https";
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}
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else {
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return DECLINED;
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}
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def_port = apr_uri_port_of_scheme(scheme);
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: HTTP: canonicalising URL %s", url);
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/* do syntatic check.
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* We break the URL into host, port, path, search
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*/
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port = def_port;
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err = ap_proxy_canon_netloc(r->pool, &url, NULL, NULL, &host, &port);
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if (err)
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return HTTP_BAD_REQUEST;
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/* now parse path/search args, according to rfc1738 */
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/* N.B. if this isn't a true proxy request, then the URL _path_
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* has already been decoded. True proxy requests have r->uri
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* == r->unparsed_uri, and no others have that property.
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*/
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if (r->uri == r->unparsed_uri) {
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search = strchr(url, '?');
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if (search != NULL)
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*(search++) = '\0';
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}
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else
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search = r->args;
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/* process path */
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path = ap_proxy_canonenc(r->pool, url, strlen(url), enc_path, r->proxyreq);
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if (path == NULL)
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return HTTP_BAD_REQUEST;
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if (port != def_port)
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apr_snprintf(sport, sizeof(sport), ":%d", port);
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else
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sport[0] = '\0';
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r->filename = apr_pstrcat(r->pool, "proxy:", scheme, "://", host, sport,
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"/", path, (search) ? "?" : "", (search) ? search : "", NULL);
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return OK;
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}
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static const char *ap_proxy_location_reverse_map(request_rec *r, proxy_server_conf *conf, const char *url)
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{
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struct proxy_alias *ent;
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int i, l1, l2;
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char *u;
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/* XXX FIXME: Make sure this handled the ambiguous case of the :80
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* after the hostname */
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l1 = strlen(url);
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ent = (struct proxy_alias *)conf->raliases->elts;
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for (i = 0; i < conf->raliases->nelts; i++) {
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l2 = strlen(ent[i].real);
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if (l1 >= l2 && strncmp(ent[i].real, url, l2) == 0) {
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u = apr_pstrcat(r->pool, ent[i].fake, &url[l2], NULL);
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return ap_construct_url(r->pool, u, r);
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}
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}
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return url;
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}
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/* Clear all connection-based headers from the incoming headers table */
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static void ap_proxy_clear_connection(apr_pool_t *p, apr_table_t *headers)
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{
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const char *name;
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char *next = apr_pstrdup(p, apr_table_get(headers, "Connection"));
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apr_table_unset(headers, "Proxy-Connection");
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if (!next)
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return;
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while (*next) {
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name = next;
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while (*next && !apr_isspace(*next) && (*next != ',')) {
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++next;
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}
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while (*next && (apr_isspace(*next) || (*next == ','))) {
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*next = '\0';
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++next;
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}
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apr_table_unset(headers, name);
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}
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apr_table_unset(headers, "Connection");
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}
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static
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apr_status_t ap_proxy_http_determine_connection(apr_pool_t *p, request_rec *r,
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proxy_http_conn_t *p_conn,
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conn_rec *c,
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proxy_server_conf *conf,
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apr_uri_t *uri,
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char **url,
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const char *proxyname,
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apr_port_t proxyport,
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char *server_portstr,
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int server_portstr_size) {
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int server_port;
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apr_status_t err;
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apr_sockaddr_t *uri_addr;
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/*
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* Break up the URL to determine the host to connect to
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*/
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/* we break the URL into host, port, uri */
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if (APR_SUCCESS != apr_uri_parse(p, *url, uri)) {
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return ap_proxyerror(r, HTTP_BAD_REQUEST,
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apr_pstrcat(p,"URI cannot be parsed: ", *url,
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NULL));
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}
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if (!uri->port) {
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uri->port = apr_uri_port_of_scheme(uri->scheme);
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}
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: HTTP connecting %s to %s:%d", *url, uri->hostname,
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uri->port);
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/* do a DNS lookup for the destination host */
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/* see memory note above */
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err = apr_sockaddr_info_get(&uri_addr, apr_pstrdup(c->pool, uri->hostname),
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APR_UNSPEC, uri->port, 0, c->pool);
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/* allocate these out of the connection pool - the check on
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* r->connection->id makes sure that this string does not get accessed
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* past the connection lifetime */
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/* are we connecting directly, or via a proxy? */
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if (proxyname) {
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p_conn->name = apr_pstrdup(c->pool, proxyname);
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p_conn->port = proxyport;
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/* see memory note above */
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err = apr_sockaddr_info_get(&p_conn->addr, p_conn->name, APR_UNSPEC,
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p_conn->port, 0, c->pool);
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} else {
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p_conn->name = apr_pstrdup(c->pool, uri->hostname);
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p_conn->port = uri->port;
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p_conn->addr = uri_addr;
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*url = apr_pstrcat(p, uri->path, uri->query ? "?" : "",
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uri->query ? uri->query : "",
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uri->fragment ? "#" : "",
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uri->fragment ? uri->fragment : "", NULL);
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}
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if (err != APR_SUCCESS) {
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return ap_proxyerror(r, HTTP_BAD_GATEWAY,
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apr_pstrcat(p, "DNS lookup failure for: ",
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p_conn->name, NULL));
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}
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/* Get the server port for the Via headers */
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{
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server_port = ap_get_server_port(r);
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if (ap_is_default_port(server_port, r)) {
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strcpy(server_portstr,"");
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} else {
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apr_snprintf(server_portstr, server_portstr_size, ":%d",
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server_port);
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}
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}
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/* check if ProxyBlock directive on this host */
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if (OK != ap_proxy_checkproxyblock(r, conf, uri_addr)) {
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return ap_proxyerror(r, HTTP_FORBIDDEN,
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"Connect to remote machine blocked");
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}
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return OK;
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}
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static
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apr_status_t ap_proxy_http_create_connection(apr_pool_t *p, request_rec *r,
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proxy_http_conn_t *p_conn,
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conn_rec *c, conn_rec **origin,
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proxy_conn_rec *backend,
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proxy_server_conf *conf,
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const char *proxyname) {
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int failed=0, new=0;
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apr_socket_t *client_socket = NULL;
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/* We have determined who to connect to. Now make the connection, supporting
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* a KeepAlive connection.
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*/
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/* get all the possible IP addresses for the destname and loop through them
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* until we get a successful connection
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*/
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/* if a keepalive socket is already open, check whether it must stay
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* open, or whether it should be closed and a new socket created.
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*/
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/* see memory note above */
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if (backend->connection) {
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client_socket = ap_get_module_config(backend->connection->conn_config, &core_module);
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if ((backend->connection->id == c->id) &&
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(backend->port == p_conn->port) &&
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(backend->hostname) &&
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(!apr_strnatcasecmp(backend->hostname, p_conn->name))) {
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: keepalive address match (keep original socket)");
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} else {
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: keepalive address mismatch / connection has"
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" changed (close old socket (%s/%s, %d/%d))",
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p_conn->name, backend->hostname, p_conn->port,
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backend->port);
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apr_socket_close(client_socket);
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backend->connection = NULL;
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}
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}
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/* get a socket - either a keepalive one, or a new one */
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new = 1;
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if ((backend->connection) && (backend->connection->id == c->id)) {
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apr_size_t buffer_len = 1;
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char test_buffer[1];
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apr_status_t socket_status;
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apr_interval_time_t current_timeout;
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/* use previous keepalive socket */
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*origin = backend->connection;
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p_conn->sock = client_socket;
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new = 0;
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/* save timeout */
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apr_socket_timeout_get(p_conn->sock, ¤t_timeout);
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/* set no timeout */
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apr_socket_timeout_set(p_conn->sock, 0);
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socket_status = apr_recv(p_conn->sock, test_buffer, &buffer_len);
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/* put back old timeout */
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apr_socket_timeout_set(p_conn->sock, current_timeout);
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if ( APR_STATUS_IS_EOF(socket_status) ) {
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ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL,
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"proxy: HTTP: previous connection is closed");
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new = 1;
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}
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}
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if (new) {
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/* create a new socket */
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backend->connection = NULL;
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/*
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* At this point we have a list of one or more IP addresses of
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* the machine to connect to. If configured, reorder this
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* list so that the "best candidate" is first try. "best
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* candidate" could mean the least loaded server, the fastest
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* responding server, whatever.
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*
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* For now we do nothing, ie we get DNS round robin.
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* XXX FIXME
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*/
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failed = ap_proxy_connect_to_backend(&p_conn->sock, "HTTP",
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p_conn->addr, p_conn->name,
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conf, r->server, c->pool);
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/* handle a permanent error on the connect */
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if (failed) {
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if (proxyname) {
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return DECLINED;
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} else {
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return HTTP_BAD_GATEWAY;
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}
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}
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: socket is connected");
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/* the socket is now open, create a new backend server connection */
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*origin = ap_run_create_connection(c->pool, r->server, p_conn->sock,
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r->connection->id,
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r->connection->sbh, c->bucket_alloc);
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if (!origin) {
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/* the peer reset the connection already; ap_run_create_connection()
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* closed the socket
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*/
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0,
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r->server, "proxy: an error occurred creating a "
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"new connection to %pI (%s)", p_conn->addr,
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p_conn->name);
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apr_socket_close(p_conn->sock);
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return HTTP_INTERNAL_SERVER_ERROR;
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}
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backend->connection = *origin;
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backend->hostname = apr_pstrdup(c->pool, p_conn->name);
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backend->port = p_conn->port;
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if (backend->is_ssl) {
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if (!ap_proxy_ssl_enable(backend->connection)) {
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ap_log_error(APLOG_MARK, APLOG_ERR, 0,
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r->server, "proxy: failed to enable ssl support "
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"for %pI (%s)", p_conn->addr, p_conn->name);
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return HTTP_INTERNAL_SERVER_ERROR;
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}
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}
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else {
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ap_proxy_ssl_disable(backend->connection);
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}
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: connection complete to %pI (%s)",
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p_conn->addr, p_conn->name);
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/* set up the connection filters */
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ap_run_pre_connection(*origin, p_conn->sock);
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}
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return OK;
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}
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static
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apr_status_t ap_proxy_http_request(apr_pool_t *p, request_rec *r,
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proxy_http_conn_t *p_conn, conn_rec *origin,
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proxy_server_conf *conf,
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apr_uri_t *uri,
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char *url, apr_bucket_brigade *bb,
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char *server_portstr) {
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conn_rec *c = r->connection;
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char *buf;
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apr_bucket *e;
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const apr_array_header_t *headers_in_array;
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const apr_table_entry_t *headers_in;
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int counter, seen_eos;
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apr_status_t status;
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/*
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* Send the HTTP/1.1 request to the remote server
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*/
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/* strip connection listed hop-by-hop headers from the request */
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/* even though in theory a connection: close coming from the client
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* should not affect the connection to the server, it's unlikely
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* that subsequent client requests will hit this thread/process, so
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* we cancel server keepalive if the client does.
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*/
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p_conn->close += ap_proxy_liststr(apr_table_get(r->headers_in,
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"Connection"), "close");
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/* sub-requests never use keepalives */
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if (r->main) {
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p_conn->close++;
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}
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ap_proxy_clear_connection(p, r->headers_in);
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if (p_conn->close) {
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apr_table_setn(r->headers_in, "Connection", "close");
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origin->keepalive = AP_CONN_CLOSE;
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}
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if ( apr_table_get(r->subprocess_env,"force-proxy-request-1.0")) {
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buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.0" CRLF, NULL);
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} else {
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buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.1" CRLF, NULL);
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}
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if ( apr_table_get(r->subprocess_env,"proxy-nokeepalive")) {
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apr_table_unset(r->headers_in, "Connection");
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origin->keepalive = AP_CONN_CLOSE;
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}
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ap_xlate_proto_to_ascii(buf, strlen(buf));
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e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(bb, e);
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if ( conf->preserve_host == 0 ) {
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if (uri->port_str && uri->port != DEFAULT_HTTP_PORT) {
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buf = apr_pstrcat(p, "Host: ", uri->hostname, ":", uri->port_str, CRLF,
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NULL);
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} else {
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buf = apr_pstrcat(p, "Host: ", uri->hostname, CRLF, NULL);
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}
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}
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else {
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/* don't want to use r->hostname, as the incoming header might have a
|
|
* port attached
|
|
*/
|
|
const char* hostname = apr_table_get(r->headers_in,"Host");
|
|
if (!hostname) {
|
|
hostname = r->server->server_hostname;
|
|
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r,
|
|
"proxy: no HTTP 0.9 request (with no host line) "
|
|
"on incoming request and preserve host set "
|
|
"forcing hostname to be %s for uri %s",
|
|
hostname,
|
|
r->uri );
|
|
}
|
|
buf = apr_pstrcat(p, "Host: ", hostname, CRLF, NULL);
|
|
}
|
|
ap_xlate_proto_to_ascii(buf, strlen(buf));
|
|
e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
|
|
APR_BRIGADE_INSERT_TAIL(bb, e);
|
|
|
|
/* handle Via */
|
|
if (conf->viaopt == via_block) {
|
|
/* Block all outgoing Via: headers */
|
|
apr_table_unset(r->headers_in, "Via");
|
|
} else if (conf->viaopt != via_off) {
|
|
/* Create a "Via:" request header entry and merge it */
|
|
/* Generate outgoing Via: header with/without server comment: */
|
|
apr_table_mergen(r->headers_in, "Via",
|
|
(conf->viaopt == via_full)
|
|
? apr_psprintf(p, "%d.%d %s%s (%s)",
|
|
HTTP_VERSION_MAJOR(r->proto_num),
|
|
HTTP_VERSION_MINOR(r->proto_num),
|
|
ap_get_server_name(r), server_portstr,
|
|
AP_SERVER_BASEVERSION)
|
|
: apr_psprintf(p, "%d.%d %s%s",
|
|
HTTP_VERSION_MAJOR(r->proto_num),
|
|
HTTP_VERSION_MINOR(r->proto_num),
|
|
ap_get_server_name(r), server_portstr)
|
|
);
|
|
}
|
|
|
|
/* X-Forwarded-*: handling
|
|
*
|
|
* XXX Privacy Note:
|
|
* -----------------
|
|
*
|
|
* These request headers are only really useful when the mod_proxy
|
|
* is used in a reverse proxy configuration, so that useful info
|
|
* about the client can be passed through the reverse proxy and on
|
|
* to the backend server, which may require the information to
|
|
* function properly.
|
|
*
|
|
* In a forward proxy situation, these options are a potential
|
|
* privacy violation, as information about clients behind the proxy
|
|
* are revealed to arbitrary servers out there on the internet.
|
|
*
|
|
* The HTTP/1.1 Via: header is designed for passing client
|
|
* information through proxies to a server, and should be used in
|
|
* a forward proxy configuation instead of X-Forwarded-*. See the
|
|
* ProxyVia option for details.
|
|
*/
|
|
|
|
if (PROXYREQ_REVERSE == r->proxyreq) {
|
|
const char *buf;
|
|
|
|
/* Add X-Forwarded-For: so that the upstream has a chance to
|
|
* determine, where the original request came from.
|
|
*/
|
|
apr_table_mergen(r->headers_in, "X-Forwarded-For",
|
|
r->connection->remote_ip);
|
|
|
|
/* Add X-Forwarded-Host: so that upstream knows what the
|
|
* original request hostname was.
|
|
*/
|
|
if ((buf = apr_table_get(r->headers_in, "Host"))) {
|
|
apr_table_mergen(r->headers_in, "X-Forwarded-Host", buf);
|
|
}
|
|
|
|
/* Add X-Forwarded-Server: so that upstream knows what the
|
|
* name of this proxy server is (if there are more than one)
|
|
* XXX: This duplicates Via: - do we strictly need it?
|
|
*/
|
|
apr_table_mergen(r->headers_in, "X-Forwarded-Server",
|
|
r->server->server_hostname);
|
|
}
|
|
|
|
/* send request headers */
|
|
proxy_run_fixups(r);
|
|
headers_in_array = apr_table_elts(r->headers_in);
|
|
headers_in = (const apr_table_entry_t *) headers_in_array->elts;
|
|
for (counter = 0; counter < headers_in_array->nelts; counter++) {
|
|
if (headers_in[counter].key == NULL || headers_in[counter].val == NULL
|
|
|
|
/* Clear out hop-by-hop request headers not to send
|
|
* RFC2616 13.5.1 says we should strip these headers
|
|
*/
|
|
/* Already sent */
|
|
|| !apr_strnatcasecmp(headers_in[counter].key, "Host")
|
|
|
|
|| !apr_strnatcasecmp(headers_in[counter].key, "Keep-Alive")
|
|
|| !apr_strnatcasecmp(headers_in[counter].key, "TE")
|
|
|| !apr_strnatcasecmp(headers_in[counter].key, "Trailer")
|
|
|| !apr_strnatcasecmp(headers_in[counter].key, "Transfer-Encoding")
|
|
|| !apr_strnatcasecmp(headers_in[counter].key, "Upgrade")
|
|
|
|
/* XXX: @@@ FIXME: "Proxy-Authorization" should *only* be
|
|
* suppressed if THIS server requested the authentication,
|
|
* not when a frontend proxy requested it!
|
|
*
|
|
* The solution to this problem is probably to strip out
|
|
* the Proxy-Authorisation header in the authorisation
|
|
* code itself, not here. This saves us having to signal
|
|
* somehow whether this request was authenticated or not.
|
|
*/
|
|
|| !apr_strnatcasecmp(headers_in[counter].key,"Proxy-Authorization")
|
|
|| !apr_strnatcasecmp(headers_in[counter].key,"Proxy-Authenticate")) {
|
|
continue;
|
|
}
|
|
/* for sub-requests, ignore freshness/expiry headers */
|
|
if (r->main) {
|
|
if (headers_in[counter].key == NULL || headers_in[counter].val == NULL
|
|
|| !apr_strnatcasecmp(headers_in[counter].key, "If-Match")
|
|
|| !apr_strnatcasecmp(headers_in[counter].key, "If-Modified-Since")
|
|
|| !apr_strnatcasecmp(headers_in[counter].key, "If-Range")
|
|
|| !apr_strnatcasecmp(headers_in[counter].key, "If-Unmodified-Since")
|
|
|| !apr_strnatcasecmp(headers_in[counter].key, "If-None-Match")) {
|
|
continue;
|
|
}
|
|
}
|
|
|
|
buf = apr_pstrcat(p, headers_in[counter].key, ": ",
|
|
headers_in[counter].val, CRLF,
|
|
NULL);
|
|
ap_xlate_proto_to_ascii(buf, strlen(buf));
|
|
e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
|
|
APR_BRIGADE_INSERT_TAIL(bb, e);
|
|
}
|
|
|
|
/* add empty line at the end of the headers */
|
|
#if APR_CHARSET_EBCDIC
|
|
e = apr_bucket_immortal_create("\015\012", 2, c->bucket_alloc);
|
|
#else
|
|
e = apr_bucket_immortal_create(CRLF, sizeof(CRLF)-1, c->bucket_alloc);
|
|
#endif
|
|
APR_BRIGADE_INSERT_TAIL(bb, e);
|
|
e = apr_bucket_flush_create(c->bucket_alloc);
|
|
APR_BRIGADE_INSERT_TAIL(bb, e);
|
|
|
|
status = ap_pass_brigade(origin->output_filters, bb);
|
|
|
|
if (status != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
|
|
"proxy: request failed to %pI (%s)",
|
|
p_conn->addr, p_conn->name);
|
|
return status;
|
|
}
|
|
|
|
/* send the request data, if any. */
|
|
seen_eos = 0;
|
|
do {
|
|
status = ap_get_brigade(r->input_filters, bb, AP_MODE_READBYTES,
|
|
APR_BLOCK_READ, HUGE_STRING_LEN);
|
|
|
|
if (status != APR_SUCCESS) {
|
|
return status;
|
|
}
|
|
|
|
/* If this brigade contain EOS, either stop or remove it. */
|
|
if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(bb))) {
|
|
/* As a shortcut, if this brigade is simply an EOS bucket,
|
|
* don't send anything down the filter chain.
|
|
*/
|
|
if (APR_BUCKET_IS_EOS(APR_BRIGADE_FIRST(bb))) {
|
|
break;
|
|
}
|
|
|
|
/* We can't pass this EOS to the output_filters. */
|
|
APR_BUCKET_REMOVE(APR_BRIGADE_LAST(bb));
|
|
seen_eos = 1;
|
|
}
|
|
|
|
e = apr_bucket_flush_create(c->bucket_alloc);
|
|
APR_BRIGADE_INSERT_TAIL(bb, e);
|
|
|
|
status = ap_pass_brigade(origin->output_filters, bb);
|
|
if (status != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
|
|
"proxy: pass request data failed to %pI (%s)",
|
|
p_conn->addr, p_conn->name);
|
|
return status;
|
|
}
|
|
apr_brigade_cleanup(bb);
|
|
} while (!seen_eos);
|
|
|
|
return APR_SUCCESS;
|
|
}
|
|
|
|
static
|
|
apr_status_t ap_proxy_http_process_response(apr_pool_t * p, request_rec *r,
|
|
proxy_http_conn_t *p_conn,
|
|
conn_rec *origin,
|
|
proxy_conn_rec *backend,
|
|
proxy_server_conf *conf,
|
|
apr_bucket_brigade *bb,
|
|
char *server_portstr) {
|
|
conn_rec *c = r->connection;
|
|
char buffer[HUGE_STRING_LEN];
|
|
char keepchar;
|
|
request_rec *rp;
|
|
apr_bucket *e;
|
|
int len, backasswards;
|
|
int received_continue = 1; /* flag to indicate if we should
|
|
* loop over response parsing logic
|
|
* in the case that the origin told us
|
|
* to HTTP_CONTINUE
|
|
*/
|
|
|
|
/* Get response from the remote server, and pass it up the
|
|
* filter chain
|
|
*/
|
|
|
|
rp = ap_proxy_make_fake_req(origin, r);
|
|
/* In case anyone needs to know, this is a fake request that is really a
|
|
* response.
|
|
*/
|
|
rp->proxyreq = PROXYREQ_RESPONSE;
|
|
|
|
while (received_continue) {
|
|
apr_brigade_cleanup(bb);
|
|
|
|
len = ap_getline(buffer, sizeof(buffer), rp, 0);
|
|
if (len == 0) {
|
|
/* handle one potential stray CRLF */
|
|
len = ap_getline(buffer, sizeof(buffer), rp, 0);
|
|
}
|
|
if (len <= 0) {
|
|
apr_socket_close(p_conn->sock);
|
|
backend->connection = NULL;
|
|
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
|
|
"proxy: error reading status line from remote "
|
|
"server %s", p_conn->name);
|
|
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
|
|
"Error reading from remote server");
|
|
}
|
|
|
|
/* Is it an HTTP/1 response?
|
|
* This is buggy if we ever see an HTTP/1.10
|
|
*/
|
|
if (apr_date_checkmask(buffer, "HTTP/#.# ###*")) {
|
|
int major, minor;
|
|
|
|
if (2 != sscanf(buffer, "HTTP/%u.%u", &major, &minor)) {
|
|
major = 1;
|
|
minor = 1;
|
|
}
|
|
/* If not an HTTP/1 message or
|
|
* if the status line was > 8192 bytes
|
|
*/
|
|
else if ((buffer[5] != '1') || (len >= sizeof(buffer)-1)) {
|
|
apr_socket_close(p_conn->sock);
|
|
backend->connection = NULL;
|
|
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
|
|
apr_pstrcat(p, "Corrupt status line returned by remote "
|
|
"server: ", buffer, NULL));
|
|
}
|
|
backasswards = 0;
|
|
|
|
keepchar = buffer[12];
|
|
if (keepchar == '\0') {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0,
|
|
r->server, "proxy: bad HTTP/%d.%d status line "
|
|
"returned by %s (%s)", major, minor, r->uri,
|
|
r->method);
|
|
}
|
|
buffer[12] = '\0';
|
|
r->status = atoi(&buffer[9]);
|
|
|
|
buffer[12] = keepchar;
|
|
r->status_line = apr_pstrdup(p, &buffer[9]);
|
|
|
|
|
|
/* read the headers. */
|
|
/* N.B. for HTTP/1.0 clients, we have to fold line-wrapped headers*/
|
|
/* Also, take care with headers with multiple occurences. */
|
|
|
|
r->headers_out = ap_proxy_read_headers(r, rp, buffer,
|
|
sizeof(buffer), origin);
|
|
if (r->headers_out == NULL) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0,
|
|
r->server, "proxy: bad HTTP/%d.%d header "
|
|
"returned by %s (%s)", major, minor, r->uri,
|
|
r->method);
|
|
p_conn->close += 1;
|
|
/*
|
|
* ap_send_error relies on a headers_out to be present. we
|
|
* are in a bad position here.. so force everything we send out
|
|
* to have nothing to do with the incoming packet
|
|
*/
|
|
r->headers_out = apr_table_make(r->pool,1);
|
|
r->status = HTTP_BAD_GATEWAY;
|
|
r->status_line = "bad gateway";
|
|
return r->status;
|
|
|
|
} else {
|
|
/* strip connection listed hop-by-hop headers from response */
|
|
const char *buf;
|
|
p_conn->close += ap_proxy_liststr(apr_table_get(r->headers_out,
|
|
"Connection"),
|
|
"close");
|
|
ap_proxy_clear_connection(p, r->headers_out);
|
|
if ((buf = apr_table_get(r->headers_out, "Content-Type"))) {
|
|
ap_set_content_type(r, apr_pstrdup(p, buf));
|
|
}
|
|
ap_proxy_pre_http_request(origin,rp);
|
|
}
|
|
|
|
/* handle Via header in response */
|
|
if (conf->viaopt != via_off && conf->viaopt != via_block) {
|
|
/* create a "Via:" response header entry and merge it */
|
|
apr_table_mergen(r->headers_out, "Via",
|
|
(conf->viaopt == via_full)
|
|
? apr_psprintf(p, "%d.%d %s%s (%s)",
|
|
HTTP_VERSION_MAJOR(r->proto_num),
|
|
HTTP_VERSION_MINOR(r->proto_num),
|
|
ap_get_server_name(r),
|
|
server_portstr,
|
|
AP_SERVER_BASEVERSION)
|
|
: apr_psprintf(p, "%d.%d %s%s",
|
|
HTTP_VERSION_MAJOR(r->proto_num),
|
|
HTTP_VERSION_MINOR(r->proto_num),
|
|
ap_get_server_name(r),
|
|
server_portstr)
|
|
);
|
|
}
|
|
|
|
/* cancel keepalive if HTTP/1.0 or less */
|
|
if ((major < 1) || (minor < 1)) {
|
|
p_conn->close += 1;
|
|
origin->keepalive = AP_CONN_CLOSE;
|
|
}
|
|
} else {
|
|
/* an http/0.9 response */
|
|
backasswards = 1;
|
|
r->status = 200;
|
|
r->status_line = "200 OK";
|
|
p_conn->close += 1;
|
|
}
|
|
|
|
if ( r->status != HTTP_CONTINUE ) {
|
|
received_continue = 0;
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL,
|
|
"proxy: HTTP: received 100 CONTINUE");
|
|
}
|
|
|
|
/* we must accept 3 kinds of date, but generate only 1 kind of date */
|
|
{
|
|
const char *buf;
|
|
if ((buf = apr_table_get(r->headers_out, "Date")) != NULL) {
|
|
apr_table_set(r->headers_out, "Date",
|
|
ap_proxy_date_canon(p, buf));
|
|
}
|
|
if ((buf = apr_table_get(r->headers_out, "Expires")) != NULL) {
|
|
apr_table_set(r->headers_out, "Expires",
|
|
ap_proxy_date_canon(p, buf));
|
|
}
|
|
if ((buf = apr_table_get(r->headers_out, "Last-Modified")) != NULL) {
|
|
apr_table_set(r->headers_out, "Last-Modified",
|
|
ap_proxy_date_canon(p, buf));
|
|
}
|
|
}
|
|
|
|
/* munge the Location and URI response headers according to
|
|
* ProxyPassReverse
|
|
*/
|
|
{
|
|
const char *buf;
|
|
if ((buf = apr_table_get(r->headers_out, "Location")) != NULL) {
|
|
apr_table_set(r->headers_out, "Location",
|
|
ap_proxy_location_reverse_map(r, conf, buf));
|
|
}
|
|
if ((buf = apr_table_get(r->headers_out, "Content-Location")) != NULL) {
|
|
apr_table_set(r->headers_out, "Content-Location",
|
|
ap_proxy_location_reverse_map(r, conf, buf));
|
|
}
|
|
if ((buf = apr_table_get(r->headers_out, "URI")) != NULL) {
|
|
apr_table_set(r->headers_out, "URI",
|
|
ap_proxy_location_reverse_map(r, conf, buf));
|
|
}
|
|
}
|
|
|
|
if ((r->status == 401) && (conf->error_override != 0)) {
|
|
const char *buf;
|
|
const char *wa = "WWW-Authenticate";
|
|
if ((buf = apr_table_get(r->headers_out, wa))) {
|
|
apr_table_set(r->err_headers_out, wa, buf);
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: origin server sent 401 without w-a header");
|
|
}
|
|
}
|
|
|
|
r->sent_bodyct = 1;
|
|
/* Is it an HTTP/0.9 response? If so, send the extra data */
|
|
if (backasswards) {
|
|
apr_ssize_t cntr = len;
|
|
e = apr_bucket_heap_create(buffer, cntr, NULL, c->bucket_alloc);
|
|
APR_BRIGADE_INSERT_TAIL(bb, e);
|
|
}
|
|
|
|
/* send body - but only if a body is expected */
|
|
if ((!r->header_only) && /* not HEAD request */
|
|
(r->status > 199) && /* not any 1xx response */
|
|
(r->status != HTTP_NO_CONTENT) && /* not 204 */
|
|
(r->status != HTTP_RESET_CONTENT) && /* not 205 */
|
|
(r->status != HTTP_NOT_MODIFIED)) { /* not 304 */
|
|
|
|
/* We need to copy the output headers and treat them as input
|
|
* headers as well. BUT, we need to do this before we remove
|
|
* TE and C-L, so that they are preserved accordingly for
|
|
* ap_http_filter to know where to end.
|
|
*/
|
|
rp->headers_in = apr_table_copy(r->pool, r->headers_out);
|
|
|
|
/* In order for ap_set_keepalive to work properly, we can NOT
|
|
* have any length information stored in the output headers.
|
|
*/
|
|
apr_table_unset(r->headers_out,"Transfer-Encoding");
|
|
apr_table_unset(r->headers_out,"Content-Length");
|
|
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: start body send");
|
|
|
|
/*
|
|
* if we are overriding the errors, we can't put the content
|
|
* of the page into the brigade
|
|
*/
|
|
if ( (conf->error_override ==0) || r->status < 400 ) {
|
|
|
|
/* read the body, pass it to the output filters */
|
|
int finish = FALSE;
|
|
while (ap_get_brigade(rp->input_filters,
|
|
bb,
|
|
AP_MODE_READBYTES,
|
|
APR_BLOCK_READ,
|
|
conf->io_buffer_size) == APR_SUCCESS) {
|
|
#if DEBUGGING
|
|
{
|
|
apr_off_t readbytes;
|
|
apr_brigade_length(bb, 0, &readbytes);
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0,
|
|
r->server, "proxy (PID %d): readbytes: %#x",
|
|
getpid(), readbytes);
|
|
}
|
|
#endif
|
|
/* sanity check */
|
|
if (APR_BRIGADE_EMPTY(bb)) {
|
|
apr_brigade_cleanup(bb);
|
|
break;
|
|
}
|
|
|
|
/* found the last brigade? */
|
|
if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(bb))) {
|
|
/* if this is the last brigade, cleanup the
|
|
* backend connection first to prevent the
|
|
* backend server from hanging around waiting
|
|
* for a slow client to eat these bytes
|
|
*/
|
|
ap_proxy_http_cleanup(r, p_conn, backend);
|
|
/* signal that we must leave */
|
|
finish = TRUE;
|
|
}
|
|
|
|
/* try send what we read */
|
|
if (ap_pass_brigade(r->output_filters, bb) != APR_SUCCESS) {
|
|
/* Ack! Phbtt! Die! User aborted! */
|
|
p_conn->close = 1; /* this causes socket close below */
|
|
finish = TRUE;
|
|
}
|
|
|
|
/* make sure we always clean up after ourselves */
|
|
apr_brigade_cleanup(bb);
|
|
|
|
/* if we are done, leave */
|
|
if (TRUE == finish) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: end body send");
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: header only");
|
|
}
|
|
}
|
|
|
|
if ( conf->error_override ) {
|
|
/* the code above this checks for 'OK' which is what the hook expects */
|
|
if ( r->status == HTTP_OK )
|
|
return OK;
|
|
else {
|
|
/* clear r->status for override error, otherwise ErrorDocument
|
|
* thinks that this is a recursive error, and doesn't find the
|
|
* custom error page
|
|
*/
|
|
int status = r->status;
|
|
r->status = HTTP_OK;
|
|
ap_discard_request_body(rp);
|
|
return status;
|
|
}
|
|
} else
|
|
return OK;
|
|
}
|
|
|
|
static
|
|
apr_status_t ap_proxy_http_cleanup(request_rec *r, proxy_http_conn_t *p_conn,
|
|
proxy_conn_rec *backend) {
|
|
/* If there are no KeepAlives, or if the connection has been signalled
|
|
* to close, close the socket and clean up
|
|
*/
|
|
|
|
/* if the connection is < HTTP/1.1, or Connection: close,
|
|
* we close the socket, otherwise we leave it open for KeepAlive support
|
|
*/
|
|
if (p_conn->close || (r->proto_num < HTTP_VERSION(1,1))) {
|
|
if (p_conn->sock) {
|
|
apr_socket_close(p_conn->sock);
|
|
p_conn->sock = NULL;
|
|
backend->connection = NULL;
|
|
}
|
|
}
|
|
return OK;
|
|
}
|
|
|
|
/*
|
|
* This handles http:// URLs, and other URLs using a remote proxy over http
|
|
* If proxyhost is NULL, then contact the server directly, otherwise
|
|
* go via the proxy.
|
|
* Note that if a proxy is used, then URLs other than http: can be accessed,
|
|
* also, if we have trouble which is clearly specific to the proxy, then
|
|
* we return DECLINED so that we can try another proxy. (Or the direct
|
|
* route.)
|
|
*/
|
|
int ap_proxy_http_handler(request_rec *r, proxy_server_conf *conf,
|
|
char *url, const char *proxyname,
|
|
apr_port_t proxyport)
|
|
{
|
|
int status;
|
|
char server_portstr[32];
|
|
conn_rec *origin = NULL;
|
|
proxy_conn_rec *backend = NULL;
|
|
int is_ssl = 0;
|
|
|
|
/* Note: Memory pool allocation.
|
|
* A downstream keepalive connection is always connected to the existence
|
|
* (or not) of an upstream keepalive connection. If this is not done then
|
|
* load balancing against multiple backend servers breaks (one backend
|
|
* server ends up taking 100% of the load), and the risk is run of
|
|
* downstream keepalive connections being kept open unnecessarily. This
|
|
* keeps webservers busy and ties up resources.
|
|
*
|
|
* As a result, we allocate all sockets out of the upstream connection
|
|
* pool, and when we want to reuse a socket, we check first whether the
|
|
* connection ID of the current upstream connection is the same as that
|
|
* of the connection when the socket was opened.
|
|
*/
|
|
apr_pool_t *p = r->connection->pool;
|
|
conn_rec *c = r->connection;
|
|
apr_bucket_brigade *bb = apr_brigade_create(p, c->bucket_alloc);
|
|
apr_uri_t *uri = apr_palloc(r->connection->pool, sizeof(*uri));
|
|
proxy_http_conn_t *p_conn = apr_pcalloc(r->connection->pool,
|
|
sizeof(*p_conn));
|
|
|
|
/* is it for us? */
|
|
if (strncasecmp(url, "https:", 6) == 0) {
|
|
if (!ap_proxy_ssl_enable(NULL)) {
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: HTTPS: declining URL %s"
|
|
" (mod_ssl not configured?)", url);
|
|
return DECLINED;
|
|
}
|
|
is_ssl = 1;
|
|
}
|
|
else if (!(strncasecmp(url, "http:", 5)==0 || (strncasecmp(url, "ftp:", 4)==0 && proxyname))) {
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: HTTP: declining URL %s", url);
|
|
return DECLINED; /* only interested in HTTP, or FTP via proxy */
|
|
}
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: HTTP: serving URL %s", url);
|
|
|
|
|
|
/* only use stored info for top-level pages. Sub requests don't share
|
|
* in keepalives
|
|
*/
|
|
if (!r->main) {
|
|
backend = (proxy_conn_rec *) ap_get_module_config(c->conn_config,
|
|
&proxy_http_module);
|
|
}
|
|
/* create space for state information */
|
|
if (!backend) {
|
|
backend = apr_pcalloc(c->pool, sizeof(proxy_conn_rec));
|
|
backend->connection = NULL;
|
|
backend->hostname = NULL;
|
|
backend->port = 0;
|
|
if (!r->main) {
|
|
ap_set_module_config(c->conn_config, &proxy_http_module, backend);
|
|
}
|
|
}
|
|
|
|
backend->is_ssl = is_ssl;
|
|
|
|
/* Step One: Determine Who To Connect To */
|
|
status = ap_proxy_http_determine_connection(p, r, p_conn, c, conf, uri,
|
|
&url, proxyname, proxyport,
|
|
server_portstr,
|
|
sizeof(server_portstr));
|
|
if ( status != OK ) {
|
|
return status;
|
|
}
|
|
|
|
/* Step Two: Make the Connection */
|
|
status = ap_proxy_http_create_connection(p, r, p_conn, c, &origin, backend,
|
|
conf, proxyname);
|
|
if ( status != OK ) {
|
|
return status;
|
|
}
|
|
|
|
/* Step Three: Send the Request */
|
|
status = ap_proxy_http_request(p, r, p_conn, origin, conf, uri, url, bb,
|
|
server_portstr);
|
|
if ( status != OK ) {
|
|
return status;
|
|
}
|
|
|
|
/* Step Four: Receive the Response */
|
|
status = ap_proxy_http_process_response(p, r, p_conn, origin, backend, conf,
|
|
bb, server_portstr);
|
|
if ( status != OK ) {
|
|
/* clean up even if there is an error */
|
|
ap_proxy_http_cleanup(r, p_conn, backend);
|
|
return status;
|
|
}
|
|
|
|
/* Step Five: Clean Up */
|
|
status = ap_proxy_http_cleanup(r, p_conn, backend);
|
|
if ( status != OK ) {
|
|
return status;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
static void ap_proxy_http_register_hook(apr_pool_t *p)
|
|
{
|
|
proxy_hook_scheme_handler(ap_proxy_http_handler, NULL, NULL, APR_HOOK_FIRST);
|
|
proxy_hook_canon_handler(ap_proxy_http_canon, NULL, NULL, APR_HOOK_FIRST);
|
|
}
|
|
|
|
module AP_MODULE_DECLARE_DATA proxy_http_module = {
|
|
STANDARD20_MODULE_STUFF,
|
|
NULL, /* create per-directory config structure */
|
|
NULL, /* merge per-directory config structures */
|
|
NULL, /* create per-server config structure */
|
|
NULL, /* merge per-server config structures */
|
|
NULL, /* command apr_table_t */
|
|
ap_proxy_http_register_hook/* register hooks */
|
|
};
|
|
|