proxy_http.c revision 61d2cd001754548e90364aa3a7e76863616544b0
98N/A/* ====================================================================
98N/A * The Apache Software License, Version 1.1
1276N/A *
98N/A * Copyright (c) 2000-2002 The Apache Software Foundation. All rights
1610N/A * reserved.
98N/A *
98N/A * Redistribution and use in source and binary forms, with or without
919N/A * modification, are permitted provided that the following conditions
919N/A * are met:
919N/A *
919N/A * 1. Redistributions of source code must retain the above copyright
919N/A * notice, this list of conditions and the following disclaimer.
919N/A *
919N/A * 2. Redistributions in binary form must reproduce the above copyright
919N/A * notice, this list of conditions and the following disclaimer in
919N/A * the documentation and/or other materials provided with the
919N/A * distribution.
919N/A *
919N/A * 3. The end-user documentation included with the redistribution,
919N/A * if any, must include the following acknowledgment:
919N/A * "This product includes software developed by the
919N/A * Apache Software Foundation (http://www.apache.org/)."
919N/A * Alternately, this acknowledgment may appear in the software itself,
919N/A * if and wherever such third-party acknowledgments normally appear.
98N/A *
98N/A * 4. The names "Apache" and "Apache Software Foundation" must
98N/A * not be used to endorse or promote products derived from this
98N/A * software without prior written permission. For written
493N/A * permission, please contact apache@apache.org.
98N/A *
98N/A * 5. Products derived from this software may not be called "Apache",
1634N/A * nor may "Apache" appear in their name, without prior written
98N/A * permission of the Apache Software Foundation.
911N/A *
1634N/A * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
1634N/A * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
1634N/A * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
911N/A * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
98N/A * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
371N/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
98N/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
98N/A * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
98N/A * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
98N/A * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
970N/A * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
977N/A * SUCH DAMAGE.
970N/A * ====================================================================
970N/A *
970N/A * This software consists of voluntary contributions made by many
970N/A * individuals on behalf of the Apache Software Foundation. For more
970N/A * information on the Apache Software Foundation, please see
970N/A * <http://www.apache.org/>.
98N/A *
559N/A * Portions of this software are based upon public domain software
493N/A * originally written at the National Center for Supercomputing Applications,
1308N/A * University of Illinois, Urbana-Champaign.
1308N/A */
969N/A
98N/A/* HTTP routines for Apache proxy */
98N/A
493N/A#include "mod_proxy.h"
98N/A
98N/Amodule AP_MODULE_DECLARE_DATA proxy_http_module;
606N/A
98N/Aint ap_proxy_http_canon(request_rec *r, char *url);
98N/Aint ap_proxy_http_handler(request_rec *r, proxy_server_conf *conf,
761N/A char *url, const char *proxyname,
559N/A apr_port_t proxyport);
559N/A
761N/Atypedef struct {
761N/A const char *name;
970N/A apr_port_t port;
970N/A apr_sockaddr_t *addr;
970N/A apr_socket_t *sock;
98N/A int close;
1308N/A} proxy_http_conn_t;
1308N/A
1610N/Astatic apr_status_t ap_proxy_http_cleanup(request_rec *r,
1308N/A proxy_http_conn_t *p_conn,
1308N/A proxy_conn_rec *backend);
1308N/A
1308N/A/*
1308N/A * Canonicalise http-like URLs.
* scheme is the scheme for the URL
* url is the URL starting with the first '/'
* def_port is the default port for this scheme.
*/
int ap_proxy_http_canon(request_rec *r, char *url)
{
char *host, *path, *search, sport[7];
const char *err;
const char *scheme;
apr_port_t port, def_port;
/* ap_default_port_for_scheme() */
if (strncasecmp(url, "http:", 5) == 0) {
url += 5;
scheme = "http";
}
else if (strncasecmp(url, "https:", 6) == 0) {
url += 6;
scheme = "https";
}
else {
return DECLINED;
}
def_port = apr_uri_default_port_for_scheme(scheme);
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: HTTP: canonicalising URL %s", url);
/* do syntatic check.
* We break the URL into host, port, path, search
*/
port = def_port;
err = ap_proxy_canon_netloc(r->pool, &url, NULL, NULL, &host, &port);
if (err)
return HTTP_BAD_REQUEST;
/* now parse path/search args, according to rfc1738 */
/* N.B. if this isn't a true proxy request, then the URL _path_
* has already been decoded. True proxy requests have r->uri
* == r->unparsed_uri, and no others have that property.
*/
if (r->uri == r->unparsed_uri) {
search = strchr(url, '?');
if (search != NULL)
*(search++) = '\0';
}
else
search = r->args;
/* process path */
path = ap_proxy_canonenc(r->pool, url, strlen(url), enc_path, r->proxyreq);
if (path == NULL)
return HTTP_BAD_REQUEST;
if (port != def_port)
apr_snprintf(sport, sizeof(sport), ":%d", port);
else
sport[0] = '\0';
r->filename = apr_pstrcat(r->pool, "proxy:", scheme, "://", host, sport,
"/", path, (search) ? "?" : "", (search) ? search : "", NULL);
return OK;
}
static const char *ap_proxy_location_reverse_map(request_rec *r, proxy_server_conf *conf, const char *url)
{
struct proxy_alias *ent;
int i, l1, l2;
char *u;
/* XXX FIXME: Make sure this handled the ambiguous case of the :80
* after the hostname */
l1 = strlen(url);
ent = (struct proxy_alias *)conf->raliases->elts;
for (i = 0; i < conf->raliases->nelts; i++) {
l2 = strlen(ent[i].real);
if (l1 >= l2 && strncmp(ent[i].real, url, l2) == 0) {
u = apr_pstrcat(r->pool, ent[i].fake, &url[l2], NULL);
return ap_construct_url(r->pool, u, r);
}
}
return url;
}
/* Clear all connection-based headers from the incoming headers table */
static void ap_proxy_clear_connection(apr_pool_t *p, apr_table_t *headers)
{
const char *name;
char *next = apr_pstrdup(p, apr_table_get(headers, "Connection"));
apr_table_unset(headers, "Proxy-Connection");
if (!next)
return;
while (*next) {
name = next;
while (*next && !apr_isspace(*next) && (*next != ',')) {
++next;
}
while (*next && (apr_isspace(*next) || (*next == ','))) {
*next = '\0';
++next;
}
apr_table_unset(headers, name);
}
apr_table_unset(headers, "Connection");
}
static
apr_status_t ap_proxy_http_determine_connection(apr_pool_t *p, request_rec *r,
proxy_http_conn_t *p_conn,
conn_rec *c,
proxy_server_conf *conf,
apr_uri_t *uri,
char **url,
const char *proxyname,
apr_port_t proxyport,
char *server_portstr,
int server_portstr_size) {
int server_port;
apr_status_t err;
apr_sockaddr_t *uri_addr;
/*
* Break up the URL to determine the host to connect to
*/
/* we break the URL into host, port, uri */
if (APR_SUCCESS != apr_uri_parse(p, *url, uri)) {
return ap_proxyerror(r, HTTP_BAD_REQUEST,
apr_pstrcat(p,"URI cannot be parsed: ", *url,
NULL));
}
if (!uri->port) {
uri->port = apr_uri_default_port_for_scheme(uri->scheme);
}
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: HTTP connecting %s to %s:%d", *url, uri->hostname,
uri->port);
/* do a DNS lookup for the destination host */
/* see memory note above */
err = apr_sockaddr_info_get(&uri_addr, apr_pstrdup(c->pool, uri->hostname),
APR_UNSPEC, uri->port, 0, c->pool);
/* allocate these out of the connection pool - the check on
* r->connection->id makes sure that this string does not get accessed
* past the connection lifetime */
/* are we connecting directly, or via a proxy? */
if (proxyname) {
p_conn->name = apr_pstrdup(c->pool, proxyname);
p_conn->port = proxyport;
/* see memory note above */
err = apr_sockaddr_info_get(&p_conn->addr, p_conn->name, APR_UNSPEC,
p_conn->port, 0, c->pool);
} else {
p_conn->name = apr_pstrdup(c->pool, uri->hostname);
p_conn->port = uri->port;
p_conn->addr = uri_addr;
*url = apr_pstrcat(p, uri->path, uri->query ? "?" : "",
uri->query ? uri->query : "",
uri->fragment ? "#" : "",
uri->fragment ? uri->fragment : "", NULL);
}
if (err != APR_SUCCESS) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
apr_pstrcat(p, "DNS lookup failure for: ",
p_conn->name, NULL));
}
/* Get the server port for the Via headers */
{
server_port = ap_get_server_port(r);
if (ap_is_default_port(server_port, r)) {
strcpy(server_portstr,"");
} else {
apr_snprintf(server_portstr, server_portstr_size, ":%d",
server_port);
}
}
/* check if ProxyBlock directive on this host */
if (OK != ap_proxy_checkproxyblock(r, conf, uri_addr)) {
return ap_proxyerror(r, HTTP_FORBIDDEN,
"Connect to remote machine blocked");
}
return OK;
}
static
apr_status_t ap_proxy_http_create_connection(apr_pool_t *p, request_rec *r,
proxy_http_conn_t *p_conn,
conn_rec *c, conn_rec **origin,
proxy_conn_rec *backend,
proxy_server_conf *conf,
const char *proxyname) {
int failed=0, new=0;
apr_socket_t *client_socket = NULL;
/* We have determined who to connect to. Now make the connection, supporting
* a KeepAlive connection.
*/
/* get all the possible IP addresses for the destname and loop through them
* until we get a successful connection
*/
/* if a keepalive socket is already open, check whether it must stay
* open, or whether it should be closed and a new socket created.
*/
/* see memory note above */
if (backend->connection) {
client_socket = ap_get_module_config(backend->connection->conn_config, &core_module);
if ((backend->connection->id == c->id) &&
(backend->port == p_conn->port) &&
(backend->hostname) &&
(!apr_strnatcasecmp(backend->hostname, p_conn->name))) {
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: keepalive address match (keep original socket)");
} else {
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: keepalive address mismatch / connection has"
" changed (close old socket (%s/%s, %d/%d))",
p_conn->name, backend->hostname, p_conn->port,
backend->port);
apr_socket_close(client_socket);
backend->connection = NULL;
}
}
/* get a socket - either a keepalive one, or a new one */
new = 1;
if ((backend->connection) && (backend->connection->id == c->id)) {
apr_size_t buffer_len = 1;
char test_buffer[1];
apr_status_t socket_status;
apr_int32_t current_timeout;
/* use previous keepalive socket */
*origin = backend->connection;
p_conn->sock = client_socket;
new = 0;
/* save timeout */
apr_getsocketopt(p_conn->sock, APR_SO_TIMEOUT, &current_timeout);
/* set no timeout */
apr_setsocketopt(p_conn->sock, APR_SO_TIMEOUT, 0);
socket_status = apr_recv(p_conn->sock, test_buffer, &buffer_len);
/* put back old timeout */
apr_setsocketopt(p_conn->sock, APR_SO_TIMEOUT, current_timeout);
if ( APR_STATUS_IS_EOF(socket_status) ) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, NULL,
"proxy: HTTP: previous connection is closed");
new = 1;
}
}
if (new) {
/* create a new socket */
backend->connection = NULL;
/*
* At this point we have a list of one or more IP addresses of
* the machine to connect to. If configured, reorder this
* list so that the "best candidate" is first try. "best
* candidate" could mean the least loaded server, the fastest
* responding server, whatever.
*
* For now we do nothing, ie we get DNS round robin.
* XXX FIXME
*/
failed = ap_proxy_connect_to_backend(&p_conn->sock, "HTTP",
p_conn->addr, p_conn->name,
conf, r->server, c->pool);
/* handle a permanent error on the connect */
if (failed) {
if (proxyname) {
return DECLINED;
} else {
return HTTP_BAD_GATEWAY;
}
}
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: socket is connected");
/* the socket is now open, create a new backend server connection */
*origin = ap_run_create_connection(c->pool, r->server, p_conn->sock,
r->connection->id,
r->connection->sbh, c->bucket_alloc);
if (!origin) {
/* the peer reset the connection already; ap_run_create_connection()
* closed the socket
*/
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0,
r->server, "proxy: an error occurred creating a "
"new connection to %pI (%s)", p_conn->addr,
p_conn->name);
apr_socket_close(p_conn->sock);
return HTTP_INTERNAL_SERVER_ERROR;
}
backend->connection = *origin;
backend->hostname = apr_pstrdup(c->pool, p_conn->name);
backend->port = p_conn->port;
if (backend->is_ssl) {
if (!ap_proxy_ssl_enable(backend->connection)) {
ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0,
r->server, "proxy: failed to enable ssl support "
"for %pI (%s)", p_conn->addr, p_conn->name);
return HTTP_INTERNAL_SERVER_ERROR;
}
}
else {
ap_proxy_ssl_disable(backend->connection);
}
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: connection complete to %pI (%s)",
p_conn->addr, p_conn->name);
/* set up the connection filters */
ap_run_pre_connection(*origin, p_conn->sock);
}
return OK;
}
static
apr_status_t ap_proxy_http_request(apr_pool_t *p, request_rec *r,
proxy_http_conn_t *p_conn, conn_rec *origin,
proxy_server_conf *conf,
apr_uri_t *uri,
char *url, apr_bucket_brigade *bb,
char *server_portstr) {
conn_rec *c = r->connection;
char buffer[HUGE_STRING_LEN];
char *buf;
apr_bucket *e;
const apr_array_header_t *headers_in_array;
const apr_table_entry_t *headers_in;
int counter;
apr_status_t status;
/*
* Send the HTTP/1.1 request to the remote server
*/
/* strip connection listed hop-by-hop headers from the request */
/* even though in theory a connection: close coming from the client
* should not affect the connection to the server, it's unlikely
* that subsequent client requests will hit this thread/process, so
* we cancel server keepalive if the client does.
*/
p_conn->close += ap_proxy_liststr(apr_table_get(r->headers_in,
"Connection"), "close");
/* sub-requests never use keepalives */
if (r->main) {
p_conn->close++;
}
ap_proxy_clear_connection(p, r->headers_in);
if (p_conn->close) {
apr_table_setn(r->headers_in, "Connection", "close");
origin->keepalive = 0;
}
buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.1" CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(bb, e);
if ( conf->preserve_host == 0 ) {
if (uri->port_str && uri->port != DEFAULT_HTTP_PORT) {
buf = apr_pstrcat(p, "Host: ", uri->hostname, ":", uri->port_str, CRLF,
NULL);
} else {
buf = apr_pstrcat(p, "Host: ", uri->hostname, CRLF, NULL);
}
}
else {
/* 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_NOERRNO|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);
}
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);
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 */
e = apr_bucket_immortal_create(CRLF, sizeof(CRLF)-1, c->bucket_alloc);
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. */
if (ap_should_client_block(r)) {
while ((counter = ap_get_client_block(r, buffer, sizeof(buffer))) > 0) {
e = apr_bucket_pool_create(buffer, counter, p, c->bucket_alloc);
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: pass request data failed to %pI (%s)",
p_conn->addr, p_conn->name);
return status;
}
apr_brigade_cleanup(bb);
}
}
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];
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);
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_NOERRNO|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;
buffer[12] = '\0';
r->status = atoi(&buffer[9]);
buffer[12] = ' ';
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|APLOG_NOERRNO, 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 */
ap_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 = 0;
}
} 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_NOERRNO|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));
}
}
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|APLOG_NOERRNO, 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|APLOG_NOERRNO, 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|APLOG_NOERRNO, 0, r->server,
"proxy: end body send");
} else {
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 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;
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|APLOG_NOERRNO, 0, r->server,
"proxy: HTTPS: declining URL %s"
" (mod_ssl not configured?)", url);
return DECLINED;
}
is_ssl = 1;
}
else if (strncasecmp(url, "http:", 5)) {
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, r->server,
"proxy: HTTP: declining URL %s", url);
return DECLINED; /* only interested in HTTP */
}
ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 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 = ap_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 */
};