mod_proxy_http.c revision 0ab36076c862846bb33365b35614ae9eb2f13535
402N/A/* Copyright 1999-2005 The Apache Software Foundation or its licensors, as
402N/A * applicable.
402N/A *
402N/A * Licensed under the Apache License, Version 2.0 (the "License");
402N/A * you may not use this file except in compliance with the License.
402N/A * You may obtain a copy of the License at
402N/A *
402N/A * http://www.apache.org/licenses/LICENSE-2.0
402N/A *
402N/A * Unless required by applicable law or agreed to in writing, software
402N/A * distributed under the License is distributed on an "AS IS" BASIS,
402N/A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
402N/A * See the License for the specific language governing permissions and
402N/A * limitations under the License.
402N/A */
402N/A
402N/A/* HTTP routines for Apache proxy */
402N/A
402N/A#include "mod_proxy.h"
402N/A
402N/Amodule AP_MODULE_DECLARE_DATA proxy_http_module;
402N/A
402N/Astatic apr_status_t ap_proxy_http_cleanup(const char *scheme,
402N/A request_rec *r,
402N/A proxy_conn_rec *backend);
402N/A
402N/A/*
402N/A * Canonicalise http-like URLs.
402N/A * scheme is the scheme for the URL
402N/A * url is the URL starting with the first '/'
402N/A * def_port is the default port for this scheme.
402N/A */
402N/Astatic int proxy_http_canon(request_rec *r, char *url)
402N/A{
402N/A char *host, *path, *search, sport[7];
402N/A const char *err;
const char *scheme;
apr_port_t port, def_port;
/* ap_port_of_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_port_of_scheme(scheme);
ap_log_error(APLOG_MARK, APLOG_DEBUG, 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) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"error parsing URL %s: %s",
url, 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, 0, r->proxyreq);
if (path == NULL)
return HTTP_BAD_REQUEST;
if (port != def_port)
apr_snprintf(sport, sizeof(sport), ":%d", port);
else
sport[0] = '\0';
if (ap_strchr_c(host, ':')) { /* if literal IPv6 address */
host = apr_pstrcat(r->pool, "[", host, "]", NULL);
}
r->filename = apr_pstrcat(r->pool, "proxy:", scheme, "://", host, sport,
"/", path, (search) ? "?" : "", (search) ? search : "", NULL);
return OK;
}
/* 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 void add_te_chunked(apr_pool_t *p,
apr_bucket_alloc_t *bucket_alloc,
apr_bucket_brigade *header_brigade)
{
apr_bucket *e;
char *buf;
const char te_hdr[] = "Transfer-Encoding: chunked" CRLF;
buf = apr_pmemdup(p, te_hdr, sizeof(te_hdr)-1);
ap_xlate_proto_to_ascii(buf, sizeof(te_hdr)-1);
e = apr_bucket_pool_create(buf, sizeof(te_hdr)-1, p, bucket_alloc);
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
}
static void add_cl(apr_pool_t *p,
apr_bucket_alloc_t *bucket_alloc,
apr_bucket_brigade *header_brigade,
const char *cl_val)
{
apr_bucket *e;
char *buf;
buf = apr_pstrcat(p, "Content-Length: ",
cl_val,
CRLF,
NULL);
ap_xlate_proto_to_ascii(buf, strlen(buf));
e = apr_bucket_pool_create(buf, strlen(buf), p, bucket_alloc);
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
}
#define ASCII_CRLF "\015\012"
#define ASCII_ZERO "\060"
static void terminate_headers(apr_bucket_alloc_t *bucket_alloc,
apr_bucket_brigade *header_brigade)
{
apr_bucket *e;
/* add empty line at the end of the headers */
e = apr_bucket_immortal_create(ASCII_CRLF, 2, bucket_alloc);
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
}
static apr_status_t pass_brigade(apr_bucket_alloc_t *bucket_alloc,
request_rec *r, proxy_conn_rec *conn,
conn_rec *origin, apr_bucket_brigade *b,
int flush)
{
apr_status_t status;
apr_off_t transferred;
if (flush) {
apr_bucket *e = apr_bucket_flush_create(bucket_alloc);
APR_BRIGADE_INSERT_TAIL(b, e);
}
apr_brigade_length(b, 0, &transferred);
if (transferred != -1)
conn->worker->s->transferred += transferred;
status = ap_pass_brigade(origin->output_filters, b);
if (status != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
"proxy: pass request data failed to %pI (%s)",
conn->addr, conn->hostname);
return status;
}
apr_brigade_cleanup(b);
return APR_SUCCESS;
}
static apr_status_t stream_reqbody_chunked(apr_pool_t *p,
request_rec *r,
proxy_conn_rec *conn,
conn_rec *origin,
apr_bucket_brigade *header_brigade)
{
int seen_eos = 0;
apr_size_t hdr_len;
apr_off_t bytes;
apr_status_t status;
apr_bucket_alloc_t *bucket_alloc = r->connection->bucket_alloc;
apr_bucket_brigade *b, *input_brigade;
apr_bucket *e;
input_brigade = apr_brigade_create(p, bucket_alloc);
do {
char chunk_hdr[20]; /* must be here due to transient bucket. */
status = ap_get_brigade(r->input_filters, input_brigade,
AP_MODE_READBYTES, APR_BLOCK_READ,
HUGE_STRING_LEN);
if (status != APR_SUCCESS) {
return status;
}
/* If this brigade contains EOS, either stop or remove it. */
if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
seen_eos = 1;
/* 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(input_brigade))) {
break;
}
/* We can't pass this EOS to the output_filters. */
e = APR_BRIGADE_LAST(input_brigade);
apr_bucket_delete(e);
}
apr_brigade_length(input_brigade, 1, &bytes);
hdr_len = apr_snprintf(chunk_hdr, sizeof(chunk_hdr),
"%" APR_UINT64_T_HEX_FMT CRLF,
(apr_uint64_t)bytes);
ap_xlate_proto_to_ascii(chunk_hdr, hdr_len);
e = apr_bucket_transient_create(chunk_hdr, hdr_len,
bucket_alloc);
APR_BRIGADE_INSERT_HEAD(input_brigade, e);
/*
* Append the end-of-chunk CRLF
*/
e = apr_bucket_immortal_create(ASCII_CRLF, 2, bucket_alloc);
APR_BRIGADE_INSERT_TAIL(input_brigade, e);
if (header_brigade) {
/* we never sent the header brigade, so go ahead and
* take care of that now
*/
add_te_chunked(p, bucket_alloc, header_brigade);
terminate_headers(bucket_alloc, header_brigade);
b = header_brigade;
APR_BRIGADE_CONCAT(b, input_brigade);
header_brigade = NULL;
}
else {
b = input_brigade;
}
status = pass_brigade(bucket_alloc, r, conn, origin, b, 0);
if (status != APR_SUCCESS) {
return status;
}
} while (!seen_eos);
if (header_brigade) {
/* we never sent the header brigade because there was no request body;
* send it now without T-E
*/
terminate_headers(bucket_alloc, header_brigade);
b = header_brigade;
}
else {
if (!APR_BRIGADE_EMPTY(input_brigade)) {
/* input brigade still has an EOS which we can't pass to the output_filters. */
e = APR_BRIGADE_LAST(input_brigade);
AP_DEBUG_ASSERT(APR_BUCKET_IS_EOS(e));
apr_bucket_delete(e);
}
e = apr_bucket_immortal_create(ASCII_ZERO ASCII_CRLF
/* <trailers> */
ASCII_CRLF,
5, bucket_alloc);
APR_BRIGADE_INSERT_TAIL(input_brigade, e);
b = input_brigade;
}
status = pass_brigade(bucket_alloc, r, conn, origin, b, 1);
return status;
}
static apr_status_t stream_reqbody_cl(apr_pool_t *p,
request_rec *r,
proxy_conn_rec *conn,
conn_rec *origin,
apr_bucket_brigade *header_brigade,
const char *old_cl_val)
{
int seen_eos = 0;
apr_status_t status;
apr_bucket_alloc_t *bucket_alloc = r->connection->bucket_alloc;
apr_bucket_brigade *b, *input_brigade;
apr_bucket *e;
input_brigade = apr_brigade_create(p, bucket_alloc);
do {
status = ap_get_brigade(r->input_filters, input_brigade,
AP_MODE_READBYTES, APR_BLOCK_READ,
HUGE_STRING_LEN);
if (status != APR_SUCCESS) {
return status;
}
/* If this brigade contains EOS, either stop or remove it. */
if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
seen_eos = 1;
/* 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(input_brigade))) {
break;
}
/* We can't pass this EOS to the output_filters. */
e = APR_BRIGADE_LAST(input_brigade);
apr_bucket_delete(e);
}
if (header_brigade) {
/* we never sent the header brigade, so go ahead and
* take care of that now
*/
add_cl(p, bucket_alloc, header_brigade, old_cl_val);
terminate_headers(bucket_alloc, header_brigade);
b = header_brigade;
APR_BRIGADE_CONCAT(b, input_brigade);
header_brigade = NULL;
}
else {
b = input_brigade;
}
status = pass_brigade(bucket_alloc, r, conn, origin, b, 0);
if (status != APR_SUCCESS) {
return status;
}
} while (!seen_eos);
if (header_brigade) {
/* we never sent the header brigade since there was no request
* body; send it now, and only specify C-L if client specified
* C-L: 0
*/
if (!strcmp(old_cl_val, "0")) {
add_cl(p, bucket_alloc, header_brigade, old_cl_val);
}
terminate_headers(bucket_alloc, header_brigade);
b = header_brigade;
}
else {
/* need to flush any pending data */
b = input_brigade; /* empty now; pass_brigade() will add flush */
}
status = pass_brigade(bucket_alloc, r, conn, origin, b, 1);
return status;
}
#define MAX_MEM_SPOOL 16384
static apr_status_t spool_reqbody_cl(apr_pool_t *p,
request_rec *r,
proxy_conn_rec *conn,
conn_rec *origin,
apr_bucket_brigade *header_brigade)
{
int seen_eos = 0;
apr_status_t status;
apr_bucket_alloc_t *bucket_alloc = r->connection->bucket_alloc;
apr_bucket_brigade *body_brigade, *input_brigade;
apr_bucket *e;
apr_off_t bytes, bytes_spooled = 0, fsize = 0;
apr_file_t *tmpfile = NULL;
body_brigade = apr_brigade_create(p, bucket_alloc);
input_brigade = apr_brigade_create(p, bucket_alloc);
do {
status = ap_get_brigade(r->input_filters, input_brigade,
AP_MODE_READBYTES, APR_BLOCK_READ,
HUGE_STRING_LEN);
if (status != APR_SUCCESS) {
return status;
}
/* If this brigade contains EOS, either stop or remove it. */
if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
seen_eos = 1;
/* 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(input_brigade))) {
break;
}
/* We can't pass this EOS to the output_filters. */
e = APR_BRIGADE_LAST(input_brigade);
apr_bucket_delete(e);
}
apr_brigade_length(input_brigade, 1, &bytes);
if (bytes_spooled + bytes > MAX_MEM_SPOOL) {
/* can't spool any more in memory; write latest brigade to disk;
* what we read into memory before reaching our threshold will
* remain there; we just write this and any subsequent data to disk
*/
if (tmpfile == NULL) {
const char *temp_dir;
char *template;
status = apr_temp_dir_get(&temp_dir, p);
if (status != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
"proxy: search for temporary directory failed");
return status;
}
apr_filepath_merge(&template, temp_dir,
"modproxy.tmp.XXXXXX",
APR_FILEPATH_NATIVE, p);
status = apr_file_mktemp(&tmpfile, template, 0, p);
if (status != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
"proxy: creation of temporary file in directory %s failed",
temp_dir);
return status;
}
}
for (e = APR_BRIGADE_FIRST(input_brigade);
e != APR_BRIGADE_SENTINEL(input_brigade);
e = APR_BUCKET_NEXT(e)) {
const char *data;
apr_size_t bytes_read, bytes_written;
apr_bucket_read(e, &data, &bytes_read, APR_BLOCK_READ);
status = apr_file_write_full(tmpfile, data, bytes_read, &bytes_written);
if (status != APR_SUCCESS) {
const char *tmpfile_name;
if (apr_file_name_get(&tmpfile_name, tmpfile) != APR_SUCCESS) {
tmpfile_name = "(unknown)";
}
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
"proxy: write to temporary file %s failed",
tmpfile_name);
return status;
}
AP_DEBUG_ASSERT(bytes_read == bytes_written);
fsize += bytes_written;
}
apr_brigade_cleanup(input_brigade);
}
else {
APR_BRIGADE_CONCAT(body_brigade, input_brigade);
}
bytes_spooled += bytes;
} while (!seen_eos);
if (bytes_spooled) {
add_cl(p, bucket_alloc, header_brigade, apr_off_t_toa(p, bytes_spooled));
}
terminate_headers(bucket_alloc, header_brigade);
APR_BRIGADE_CONCAT(header_brigade, body_brigade);
if (tmpfile) {
/* For platforms where the size of the file may be larger than
* that which can be stored in a single bucket (where the
* length field is an apr_size_t), split it into several
* buckets: */
if (sizeof(apr_off_t) > sizeof(apr_size_t)
&& fsize > AP_MAX_SENDFILE) {
e = apr_bucket_file_create(tmpfile, 0, AP_MAX_SENDFILE, p,
bucket_alloc);
while (fsize > AP_MAX_SENDFILE) {
apr_bucket *ce;
apr_bucket_copy(e, &ce);
APR_BRIGADE_INSERT_TAIL(header_brigade, ce);
e->start += AP_MAX_SENDFILE;
fsize -= AP_MAX_SENDFILE;
}
e->length = (apr_size_t)fsize; /* Resize just the last bucket */
}
else {
e = apr_bucket_file_create(tmpfile, 0, (apr_size_t)fsize, p,
bucket_alloc);
}
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
}
status = pass_brigade(bucket_alloc, r, conn, origin, header_brigade, 1);
return status;
}
static apr_status_t send_request_body(apr_pool_t *p,
request_rec *r,
proxy_conn_rec *conn,
conn_rec *origin,
apr_bucket_brigade *header_brigade,
int force10)
{
enum {RB_INIT, RB_STREAM_CL, RB_STREAM_CHUNKED, RB_SPOOL_CL} rb_method = RB_INIT;
const char *old_cl_val, *te_val;
int cl_zero; /* client sent "Content-Length: 0", which we forward on to server */
apr_status_t status;
/* send CL or use chunked encoding?
*
* . CL is the most friendly to the origin server since it is the
* most widely supported
* . CL stinks if we don't know the length since we have to buffer
* the data in memory or on disk until we get the entire data
*
* special cases to check for:
* . if we're using HTTP/1.0 to origin server, then we must send CL
* . if client sent C-L and there are no input resource filters, the
* the body size can't change so we send the same CL and stream the
* body
* . if client used chunked or proxy-sendchunks is set, we'll use
* chunked
*
* normal case:
* we have to compute content length by reading the entire request
* body; if request body is not small, we'll spool the remaining input
* to a temporary file
*
* special envvars to override the normal decision:
* . proxy-sendchunks
* use chunked encoding; not compatible with force-proxy-request-1.0
* . proxy-sendcl
* spool the request body to compute C-L
* . proxy-sendunchangedcl
* use C-L from client and spool the request body
*/
old_cl_val = apr_table_get(r->headers_in, "Content-Length");
cl_zero = old_cl_val && !strcmp(old_cl_val, "0");
if (!force10
&& !cl_zero
&& apr_table_get(r->subprocess_env, "proxy-sendchunks")) {
rb_method = RB_STREAM_CHUNKED;
}
else if (!cl_zero
&& apr_table_get(r->subprocess_env, "proxy-sendcl")) {
rb_method = RB_SPOOL_CL;
}
else {
if (old_cl_val &&
(r->input_filters == r->proto_input_filters
|| cl_zero
|| apr_table_get(r->subprocess_env, "proxy-sendunchangedcl"))) {
rb_method = RB_STREAM_CL;
}
else if (force10) {
rb_method = RB_SPOOL_CL;
}
else if ((te_val = apr_table_get(r->headers_in, "Transfer-Encoding"))
&& !strcasecmp(te_val, "chunked")) {
rb_method = RB_STREAM_CHUNKED;
}
else {
rb_method = RB_SPOOL_CL;
}
}
switch(rb_method) {
case RB_STREAM_CHUNKED:
status = stream_reqbody_chunked(p, r, conn, origin, header_brigade);
break;
case RB_STREAM_CL:
status = stream_reqbody_cl(p, r, conn, origin, header_brigade, old_cl_val);
break;
case RB_SPOOL_CL:
status = spool_reqbody_cl(p, r, conn, origin, header_brigade);
break;
default:
ap_assert(1 != 1);
}
return status;
}
static
apr_status_t ap_proxy_http_request(apr_pool_t *p, request_rec *r,
proxy_conn_rec *conn, conn_rec *origin,
proxy_server_conf *conf,
apr_uri_t *uri,
char *url, char *server_portstr)
{
conn_rec *c = r->connection;
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;
apr_bucket_brigade *header_brigade;
int force10;
header_brigade = apr_brigade_create(p, origin->bucket_alloc);
/*
* 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.
*/
conn->close += ap_proxy_liststr(apr_table_get(r->headers_in,
"Connection"), "close");
/* sub-requests never use keepalives */
if (r->main) {
conn->close++;
}
ap_proxy_clear_connection(p, r->headers_in);
if (conn->close) {
apr_table_setn(r->headers_in, "Connection", "close");
origin->keepalive = AP_CONN_CLOSE;
}
/* By default, we can not send chunks. That means we must buffer
* the entire request before sending it along to ensure we have
* the correct Content-Length attached. A special case is when
* the client specifies Content-Length and there are no filters
* which muck with the request body. In that situation, we don't
* have to buffer the entire request and can still send the
* Content-Length. Another special case is when the client
* specifies a C-L of 0. Pass that through as well.
*/
if (apr_table_get(r->subprocess_env, "force-proxy-request-1.0")) {
buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.0" CRLF, NULL);
force10 = 1;
} else {
buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.1" CRLF, NULL);
force10 = 0;
}
if (apr_table_get(r->subprocess_env, "proxy-nokeepalive")) {
apr_table_unset(r->headers_in, "Connection");
origin->keepalive = AP_CONN_CLOSE;
}
ap_xlate_proto_to_ascii(buf, strlen(buf));
e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(header_brigade, 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_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(header_brigade, 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) {
const char *server_name = ap_get_server_name(r);
/* If USE_CANONICAL_NAME_OFF was configured for the proxy virtual host,
* then the server name returned by ap_get_server_name() is the
* origin server name (which does make too much sense with Via: headers)
* so we use the proxy vhost's name instead.
*/
if (server_name == r->hostname)
server_name = r->server->server_hostname;
/* 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),
server_name, server_portstr,
AP_SERVER_BASEVERSION)
: apr_psprintf(p, "%d.%d %s%s",
HTTP_VERSION_MAJOR(r->proto_num),
HTTP_VERSION_MINOR(r->proto_num),
server_name, 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")
/* We'll add appropriate Content-Length later, if appropriate.
*/
|| !apr_strnatcasecmp(headers_in[counter].key, "Content-Length")
/* 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(header_brigade, e);
}
/* send the request data, if any. */
status = send_request_body(p, r, conn, origin, header_brigade, force10);
if (status != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
"proxy: pass request data failed to %pI (%s)",
conn->addr, conn->hostname);
return status;
}
return APR_SUCCESS;
}
static void process_proxy_header(request_rec* r, proxy_server_conf* c,
const char* key, const char* value)
{
static const char* date_hdrs[]
= { "Date", "Expires", "Last-Modified", NULL } ;
static const struct {
const char* name;
ap_proxy_header_reverse_map_fn func;
} transform_hdrs[] = {
{ "Location", ap_proxy_location_reverse_map } ,
{ "Content-Location", ap_proxy_location_reverse_map } ,
{ "URI", ap_proxy_location_reverse_map } ,
{ "Destination", ap_proxy_location_reverse_map } ,
{ "Set-Cookie", ap_proxy_cookie_reverse_map } ,
{ NULL, NULL }
} ;
int i ;
for ( i = 0 ; date_hdrs[i] ; ++i ) {
if ( !strcasecmp(date_hdrs[i], key) ) {
apr_table_add(r->headers_out, key,
ap_proxy_date_canon(r->pool, value)) ;
return ;
}
}
for ( i = 0 ; transform_hdrs[i].name ; ++i ) {
if ( !strcasecmp(transform_hdrs[i].name, key) ) {
apr_table_add(r->headers_out, key,
(*transform_hdrs[i].func)(r, c, value)) ;
return ;
}
}
apr_table_add(r->headers_out, key, value) ;
return ;
}
/*
* Note: pread_len is the length of the response that we've mistakenly
* read (assuming that we don't consider that an error via
* ProxyBadHeader StartBody). This depends on buffer actually being
* local storage to the calling code in order for pread_len to make
* any sense at all, since we depend on buffer still containing
* what was read by ap_getline() upon return.
*/
static void ap_proxy_read_headers(request_rec *r, request_rec *rr,
char *buffer, int size,
conn_rec *c, int *pread_len)
{
int len;
char *value, *end;
char field[MAX_STRING_LEN];
int saw_headers = 0;
void *sconf = r->server->module_config;
proxy_server_conf *psc;
psc = (proxy_server_conf *) ap_get_module_config(sconf, &proxy_module);
r->headers_out = apr_table_make(r->pool, 20);
*pread_len = 0;
/*
* Read header lines until we get the empty separator line, a read error,
* the connection closes (EOF), or we timeout.
*/
while ((len = ap_getline(buffer, size, rr, 1)) > 0) {
if (!(value = strchr(buffer, ':'))) { /* Find the colon separator */
/* We may encounter invalid headers, usually from buggy
* MS IIS servers, so we need to determine just how to handle
* them. We can either ignore them, assume that they mark the
* start-of-body (eg: a missing CRLF) or (the default) mark
* the headers as totally bogus and return a 500. The sole
* exception is an extra "HTTP/1.0 200, OK" line sprinkled
* in between the usual MIME headers, which is a favorite
* IIS bug.
*/
/* XXX: The mask check is buggy if we ever see an HTTP/1.10 */
if (!apr_date_checkmask(buffer, "HTTP/#.# ###*")) {
if (psc->badopt == bad_error) {
/* Nope, it wasn't even an extra HTTP header. Give up. */
return ;
}
else if (psc->badopt == bad_body) {
/* if we've already started loading headers_out, then
* return what we've accumulated so far, in the hopes
* that they are useful; also note that we likely pre-read
* the first line of the response.
*/
if (saw_headers) {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, r->server,
"proxy: Starting body due to bogus non-header in headers "
"returned by %s (%s)", r->uri, r->method);
*pread_len = len;
return ;
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, r->server,
"proxy: No HTTP headers "
"returned by %s (%s)", r->uri, r->method);
return ;
}
}
}
/* this is the psc->badopt == bad_ignore case */
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, r->server,
"proxy: Ignoring bogus HTTP header "
"returned by %s (%s)", r->uri, r->method);
continue;
}
*value = '\0';
++value;
/* XXX: RFC2068 defines only SP and HT as whitespace, this test is
* wrong... and so are many others probably.
*/
while (apr_isspace(*value))
++value; /* Skip to start of value */
/* should strip trailing whitespace as well */
for (end = &value[strlen(value)-1]; end > value && apr_isspace(*end); --
end)
*end = '\0';
/* make sure we add so as not to destroy duplicated headers
* Modify headers requiring canonicalisation and/or affected
* by ProxyPassReverse and family with process_proxy_header
*/
process_proxy_header(r, psc, buffer, value) ;
saw_headers = 1;
/* the header was too long; at the least we should skip extra data */
if (len >= size - 1) {
while ((len = ap_getline(field, MAX_STRING_LEN, rr, 1))
>= MAX_STRING_LEN - 1) {
/* soak up the extra data */
}
if (len == 0) /* time to exit the larger loop as well */
break;
}
}
}
static int addit_dammit(void *v, const char *key, const char *val)
{
apr_table_addn(v, key, val);
return 1;
}
static
apr_status_t ap_proxy_http_process_response(apr_pool_t * p, request_rec *r,
proxy_conn_rec *backend,
conn_rec *origin,
proxy_server_conf *conf,
char *server_portstr) {
conn_rec *c = r->connection;
char buffer[HUGE_STRING_LEN];
char keepchar;
request_rec *rp;
apr_bucket *e;
apr_bucket_brigade *bb;
int len, backasswards;
int interim_response; /* non-zero whilst interim 1xx responses
* are being read. */
int pread_len = 0;
apr_table_t *save_table;
bb = apr_brigade_create(p, c->bucket_alloc);
/* 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;
do {
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) {
ap_proxy_http_cleanup(NULL, r, backend);
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"proxy: error reading status line from remote "
"server %s", backend->hostname);
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
/* XXX: Is this a real headers length send from remote? */
backend->worker->s->read += len;
/* 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)) {
ap_proxy_http_cleanup(NULL, r, backend);
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
apr_pstrcat(p, "Corrupt status line returned by remote "
"server: ", buffer, NULL));
}
backasswards = 0;
keepchar = buffer[12];
buffer[12] = '\0';
r->status = atoi(&buffer[9]);
if (keepchar != '\0') {
buffer[12] = keepchar;
} else {
/* 2616 requires the space in Status-Line; the origin
* server may have sent one but ap_rgetline_core will
* have stripped it. */
buffer[12] = ' ';
buffer[13] = '\0';
}
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. */
/* First, tuck away all already existing cookies */
save_table = apr_table_make(r->pool, 2);
apr_table_do(addit_dammit, save_table, r->headers_out,
"Set-Cookie", NULL);
/* shove the headers direct into r->headers_out */
ap_proxy_read_headers(r, rp, buffer, sizeof(buffer), origin,
&pread_len);
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);
backend->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 {
const char *buf;
/* Now, add in the just read cookies */
apr_table_do(addit_dammit, save_table, r->headers_out,
"Set-Cookie", NULL);
/* and now load 'em all in */
if (!apr_is_empty_table(save_table)) {
apr_table_unset(r->headers_out, "Set-Cookie");
r->headers_out = apr_table_overlay(r->pool,
r->headers_out,
save_table);
}
/* strip connection listed hop-by-hop headers from response */
backend->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) {
const char *server_name = ap_get_server_name(r);
/* If USE_CANONICAL_NAME_OFF was configured for the proxy virtual host,
* then the server name returned by ap_get_server_name() is the
* origin server name (which does make too much sense with Via: headers)
* so we use the proxy vhost's name instead.
*/
if (server_name == r->hostname)
server_name = r->server->server_hostname;
/* 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),
server_name,
server_portstr,
AP_SERVER_BASEVERSION)
: apr_psprintf(p, "%d.%d %s%s",
HTTP_VERSION_MAJOR(r->proto_num),
HTTP_VERSION_MINOR(r->proto_num),
server_name,
server_portstr)
);
}
/* cancel keepalive if HTTP/1.0 or less */
if ((major < 1) || (minor < 1)) {
backend->close += 1;
origin->keepalive = AP_CONN_CLOSE;
}
} else {
/* an http/0.9 response */
backasswards = 1;
r->status = 200;
r->status_line = "200 OK";
backend->close += 1;
}
interim_response = ap_is_HTTP_INFO(r->status);
if (interim_response) {
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL,
"proxy: HTTP: received interim %d response",
r->status);
}
/* Moved the fixups of Date headers and those affected by
* ProxyPassReverse/etc from here to ap_proxy_read_headers
*/
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 WWW-Authenticate header");
}
}
r->sent_bodyct = 1;
/*
* Is it an HTTP/0.9 response or did we maybe preread the 1st line of
* the response? If so, load the extra data. These are 2 mutually
* exclusive possibilities, that just happen to require very
* similar behavior.
*/
if (backasswards || pread_len) {
apr_ssize_t cntr = (apr_ssize_t)pread_len;
if (backasswards) {
/*@@@FIXME:
* At this point in response processing of a 0.9 response,
* we don't know yet whether data is binary or not.
* mod_charset_lite will get control later on, so it cannot
* decide on the conversion of this buffer full of data.
* However, chances are that we are not really talking to an
* HTTP/0.9 server, but to some different protocol, therefore
* the best guess IMHO is to always treat the buffer as "text/x":
*/
ap_xlate_proto_to_ascii(buffer, len);
cntr = (apr_ssize_t)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 */
!interim_response && /* not any 1xx response */
(r->status != HTTP_NO_CONTENT) && /* not 204 */
(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, 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);
apr_table_unset(r->headers_out,"Transfer-Encoding");
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 || ap_is_HTTP_SUCCESS(r->status)) {
/* read the body, pass it to the output filters */
apr_read_type_e mode = APR_NONBLOCK_READ;
int finish = FALSE;
do {
apr_off_t readbytes;
apr_status_t rv;
rv = ap_get_brigade(rp->input_filters, bb,
AP_MODE_READBYTES, mode,
conf->io_buffer_size);
/* ap_get_brigade will return success with an empty brigade
* for a non-blocking read which would block: */
if (APR_STATUS_IS_EAGAIN(rv)
|| (rv == APR_SUCCESS && APR_BRIGADE_EMPTY(bb))) {
/* flush to the client and switch to blocking mode */
e = apr_bucket_flush_create(c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(bb, e);
if (ap_pass_brigade(r->output_filters, bb)
|| c->aborted) {
backend->close = 1;
break;
}
apr_brigade_cleanup(bb);
mode = APR_BLOCK_READ;
continue;
}
else if (rv != APR_SUCCESS) {
ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c,
"proxy: error reading response");
break;
}
/* next time try a non-blocking read */
mode = APR_NONBLOCK_READ;
apr_brigade_length(bb, 0, &readbytes);
backend->worker->s->read += readbytes;
#if DEBUGGING
{
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
*/
backend->close = 1;
/* signal that we must leave */
finish = TRUE;
}
/* try send what we read */
if (ap_pass_brigade(r->output_filters, bb) != APR_SUCCESS
|| c->aborted) {
/* Ack! Phbtt! Die! User aborted! */
backend->close = 1; /* this causes socket close below */
finish = TRUE;
}
/* make sure we always clean up after ourselves */
apr_brigade_cleanup(bb);
} while (!finish);
}
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");
}
} while (interim_response);
if (conf->error_override) {
/* the code above this checks for 'OK' which is what the hook expects */
if (ap_is_HTTP_SUCCESS(r->status))
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;
/* Discard body, if one is expected */
if ((status != HTTP_NO_CONTENT) && /* not 204 */
(status != HTTP_NOT_MODIFIED)) { /* not 304 */
ap_discard_request_body(rp);
}
return status;
}
} else
return OK;
}
static
apr_status_t ap_proxy_http_cleanup(const char *scheme, request_rec *r,
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 (backend->close || (r->proto_num < HTTP_VERSION(1,1))) {
backend->close_on_recycle = 1;
ap_set_module_config(r->connection->conn_config, &proxy_http_module, NULL);
ap_proxy_release_connection(scheme, backend, r->server);
}
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.)
*/
static int proxy_http_handler(request_rec *r, proxy_worker *worker,
proxy_server_conf *conf,
char *url, const char *proxyname,
apr_port_t proxyport)
{
int status;
char server_portstr[32];
char *scheme;
const char *proxy_function;
const char *u;
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_uri_t *uri = apr_palloc(r->connection->pool, sizeof(*uri));
/* find the scheme */
u = strchr(url, ':');
if (u == NULL || u[1] != '/' || u[2] != '/' || u[3] == '\0')
return DECLINED;
if ((u - url) > 14)
return HTTP_BAD_REQUEST;
scheme = apr_pstrndup(c->pool, url, u - url);
/* scheme is lowercase */
ap_str_tolower(scheme);
/* is it for us? */
if (strcmp(scheme, "https") == 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;
proxy_function = "HTTPS";
}
else if (!(strcmp(scheme, "http") == 0 || (strcmp(scheme, "ftp") == 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 */
}
else {
if (*scheme == 'h')
proxy_function = "HTTP";
else
proxy_function = "FTP";
}
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) {
if ((status = ap_proxy_acquire_connection(proxy_function, &backend,
worker, r->server)) != OK)
goto cleanup;
if (!r->main) {
ap_set_module_config(c->conn_config, &proxy_http_module, backend);
}
}
backend->is_ssl = is_ssl;
backend->close_on_recycle = 1;
/* Step One: Determine Who To Connect To */
if ((status = ap_proxy_determine_connection(p, r, conf, worker, backend,
uri, &url, proxyname,
proxyport, server_portstr,
sizeof(server_portstr))) != OK)
goto cleanup;
/* Step Two: Make the Connection */
if (ap_proxy_connect_backend(proxy_function, backend, worker, r->server)) {
if (r->proxyreq == PROXYREQ_PROXY)
status = HTTP_NOT_FOUND;
else
status = HTTP_SERVICE_UNAVAILABLE;
goto cleanup;
}
/* Step Three: Create conn_rec */
if (!backend->connection) {
if ((status = ap_proxy_connection_create(proxy_function, backend,
c, r->server)) != OK)
goto cleanup;
}
/* Step Four: Send the Request */
if ((status = ap_proxy_http_request(p, r, backend, backend->connection,
conf, uri, url, server_portstr)) != OK)
goto cleanup;
/* Step Five: Receive the Response */
if ((status = ap_proxy_http_process_response(p, r, backend,
backend->connection,
conf, server_portstr)) != OK)
goto cleanup;
/* Step Six: Clean Up */
cleanup:
if (backend) {
if (status != OK) {
backend->close = 1;
backend->close_on_recycle = 1;
}
ap_proxy_http_cleanup(proxy_function, r, backend);
}
return status;
}
static void ap_proxy_http_register_hook(apr_pool_t *p)
{
proxy_hook_scheme_handler(proxy_http_handler, NULL, NULL, APR_HOOK_FIRST);
proxy_hook_canon_handler(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 */
};