mod_proxy_http.c revision ee34e916a3599b78e9a0f3720e990e50a6efa090
/* Copyright 1999-2005 The Apache Software Foundation or its licensors, as
* applicable.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* HTTP routines for Apache proxy */
#include "mod_proxy.h"
request_rec *r,
/*
* 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.
*/
{
const char *err;
const char *scheme;
/* ap_port_of_scheme() */
url += 5;
scheme = "http";
}
url += 6;
scheme = "https";
}
else {
return DECLINED;
}
"proxy: HTTP: canonicalising URL %s", url);
/* do syntatic check.
* We break the URL into host, port, path, search
*/
if (err) {
"error parsing URL %s: %s",
return HTTP_BAD_REQUEST;
}
/* 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++) = '\0';
}
else
/* process path */
return HTTP_BAD_REQUEST;
else
sport[0] = '\0';
}
return OK;
}
/* Clear all connection-based headers from the incoming headers table */
{
const char *name;
if (!next)
return;
while (*next) {
++next;
}
*next = '\0';
++next;
}
}
}
static void add_te_chunked(apr_pool_t *p,
{
apr_bucket *e;
char *buf;
}
static void add_cl(apr_pool_t *p,
const char *cl_val)
{
apr_bucket *e;
char *buf;
CRLF,
NULL);
}
#define ASCII_CRLF "\015\012"
#define ASCII_ZERO "\060"
{
apr_bucket *e;
/* add empty line at the end of the headers */
}
int flush)
{
if (flush) {
}
if (transferred != -1)
if (status != APR_SUCCESS) {
"proxy: pass request body failed to %pI (%s)",
return status;
}
return APR_SUCCESS;
}
#define MAX_MEM_SPOOL 16384
request_rec *r,
{
int seen_eos = 0;
apr_bucket *e;
{
/* If this brigade contains EOS, either stop or remove it. */
seen_eos = 1;
/* We can't pass this EOS to the output_filters. */
}
/*
* Append the end-of-chunk CRLF
*/
if (header_brigade) {
/* we never sent the header brigade, so go ahead and
* take care of that now
*/
bb = header_brigade;
/*
* Save input_brigade in bb brigade. (At least) in the SSL case
* input_brigade contains transient buckets whose data would get
* overwritten during the next call of ap_get_brigade in the loop.
* ap_save_brigade ensures these buckets to be set aside.
* Calling ap_save_brigade with NULL as filter is OK, because
* bb brigade already has been created and does not need to get
* created by ap_save_brigade.
*/
if (status != APR_SUCCESS) {
return status;
}
}
else {
bb = input_brigade;
}
/* The request is flushed below this loop with chunk EOS header */
if (status != APR_SUCCESS) {
return status;
}
if (seen_eos) {
break;
}
if (status != APR_SUCCESS) {
return status;
}
}
if (header_brigade) {
/* we never sent the header brigade because there was no request body;
* send it now
*/
bb = header_brigade;
}
else {
if (!APR_BRIGADE_EMPTY(input_brigade)) {
/* input brigade still has an EOS which we can't pass to the output_filters. */
}
bb = input_brigade;
}
/* <trailers> */
5, bucket_alloc);
/* Now we have headers-only, or the chunk EOS mark; flush it */
return status;
}
request_rec *r,
const char *old_cl_val)
{
int seen_eos = 0;
apr_bucket *e;
apr_off_t bytes_streamed = 0;
if (old_cl_val) {
}
{
bytes_streamed += bytes;
/* If this brigade contains EOS, either stop or remove it. */
seen_eos = 1;
/* We can't pass this EOS to the output_filters. */
}
/* C-L < bytes streamed?!?
* We will error out after the body is completely
* consumed, but we can't stream more bytes at the
* back end since they would in part be interpreted
* as another request! If nothing is sent, then
* just send nothing.
*
* Prevents HTTP Response Splitting.
*/
if (bytes_streamed > cl_val)
continue;
if (header_brigade) {
/* we never sent the header brigade, so go ahead and
* take care of that now
*/
bb = header_brigade;
/*
* Save input_brigade in bb brigade. (At least) in the SSL case
* input_brigade contains transient buckets whose data would get
* overwritten during the next call of ap_get_brigade in the loop.
* ap_save_brigade ensures these buckets to be set aside.
* Calling ap_save_brigade with NULL as filter is OK, because
* bb brigade already has been created and does not need to get
* created by ap_save_brigade.
*/
if (status != APR_SUCCESS) {
return status;
}
}
else {
bb = input_brigade;
}
/* Once we hit EOS, we are ready to flush. */
if (status != APR_SUCCESS) {
return status;
}
if (seen_eos) {
break;
}
if (status != APR_SUCCESS) {
return status;
}
}
if (bytes_streamed != cl_val) {
"proxy: client %s given Content-Length did not match"
return APR_EOF;
}
if (header_brigade) {
/* we never sent the header brigade since there was no request
* body; send it now with the flush flag
*/
bb = header_brigade;
}
return status;
}
request_rec *r,
int force_cl)
{
int seen_eos = 0;
apr_bucket *e;
{
/* If this brigade contains EOS, either stop or remove it. */
seen_eos = 1;
/* We can't pass this EOS to the output_filters. */
}
/* can't spool any more in memory; write latest brigade to disk */
const char *temp_dir;
char *template;
if (status != APR_SUCCESS) {
"proxy: search for temporary directory failed");
return status;
}
"modproxy.tmp.XXXXXX",
APR_FILEPATH_NATIVE, p);
if (status != APR_SUCCESS) {
"proxy: creation of temporary file in directory %s failed",
temp_dir);
return status;
}
}
for (e = APR_BRIGADE_FIRST(input_brigade);
e = APR_BUCKET_NEXT(e)) {
const char *data;
if (status != APR_SUCCESS) {
const char *tmpfile_name;
tmpfile_name = "(unknown)";
}
"proxy: write to temporary file %s failed",
return status;
}
fsize += bytes_written;
}
}
else {
/*
* Save input_brigade in body_brigade. (At least) in the SSL case
* input_brigade contains transient buckets whose data would get
* overwritten during the next call of ap_get_brigade in the loop.
* ap_save_brigade ensures these buckets to be set aside.
* Calling ap_save_brigade with NULL as filter is OK, because
* body_brigade already has been created and does not need to get
* created by ap_save_brigade.
*/
if (status != APR_SUCCESS) {
return status;
}
}
bytes_spooled += bytes;
if (seen_eos) {
break;
}
if (status != APR_SUCCESS) {
return status;
}
}
if (bytes_spooled || force_cl) {
}
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) {
while (fsize > AP_MAX_SENDFILE) {
apr_bucket *ce;
apr_bucket_copy(e, &ce);
e->start += AP_MAX_SENDFILE;
fsize -= AP_MAX_SENDFILE;
}
}
else {
}
}
/* This is all a single brigade, pass with flush flagged */
return status;
}
static
char *url, char *server_portstr)
{
conn_rec *c = r->connection;
apr_bucket *e;
char *buf;
const apr_array_header_t *headers_in_array;
const apr_table_entry_t *headers_in;
int counter;
const char *old_cl_val = NULL;
const char *old_te_val = NULL;
apr_off_t bytes_read = 0;
int force10;
/*
* Send the HTTP/1.1 request to the remote server
*/
force10 = 1;
} else {
force10 = 0;
}
}
if (conf->preserve_host == 0) {
} else {
}
}
else {
/* don't want to use r->hostname, as the incoming header might have a
* port attached
*/
if (!hostname) {
"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",
r->uri );
}
}
/* handle Via */
/* Block all outgoing Via: headers */
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)
/* Create a "Via:" request header entry and merge it */
? apr_psprintf(p, "%d.%d %s%s (%s)",
: apr_psprintf(p, "%d.%d %s%s",
);
}
/* 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.
*/
c->remote_ip);
/* Add X-Forwarded-Host: so that upstream knows what the
* original request hostname was.
*/
}
/* 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?
*/
r->server->server_hostname);
}
proxy_run_fixups(r);
/*
* Make a copy of the headers_in table before clearing the connection
* headers as we need the connection headers later in the http output
* filter to prepare the correct response headers.
*
* Note: We need to take r->pool for apr_table_copy as the key / value
* pairs in r->headers_in have been created out of r->pool and
* p might be (and actually is) a longer living pool.
* This would trigger the bad pool ancestry abort in apr_table_copy if
* apr is compiled with APR_POOL_DEBUG.
*/
/* send request headers */
/* Already sent */
/* Clear out hop-by-hop request headers not to send
* RFC2616 13.5.1 says we should strip these headers
*/
/* 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.
*/
continue;
}
/* Skip Transfer-Encoding and Content-Length for now.
*/
continue;
}
continue;
}
if (r->main) {
continue;
}
}
NULL);
}
/* We have headers, let's figure out our request body... */
/* sub-requests never use keepalives, and mustn't pass request bodies.
* Because the new logic looks at input_brigade, we will self-terminate
* input_brigade and jump past all of the request body logic...
* Reading anything with ap_get_brigade is likely to consume the
* main request's body or read beyond EOS - which would be unplesant.
*/
if (r->main) {
/* XXX: Why DON'T sub-requests use keepalives? */
if (old_cl_val) {
old_cl_val = NULL;
}
if (old_te_val) {
old_te_val = NULL;
}
goto skip_body;
}
/* WE only understand chunked. Other modules might inject
* (and therefore, decode) other flavors but we don't know
* that the can and have done so unless they they remove
* their decoding from the headers_in T-E list.
* XXX: Make this extensible, but in doing so, presume the
* encoding has been done by the extensions' handler, and
* do not modify add_te_chunked's logic
*/
"proxy: %s Transfer-Encoding is not supported",
return APR_EINVAL;
}
if (old_cl_val && old_te_val) {
"proxy: client %s (%s) requested Transfer-Encoding "
"chunked body with Content-Length (C-L ignored)",
old_cl_val = NULL;
}
/* Prefetch MAX_MEM_SPOOL bytes
*
* This helps us avoid any election of C-L v.s. T-E
* request bodies, since we are willing to keep in
* memory this much data, in any case. This gives
* us an instant C-L election if the body is of some
* reasonable size.
*/
do {
if (status != APR_SUCCESS) {
"proxy: prefetch request body failed to %pI (%s)"
" from %s (%s)",
return status;
}
bytes_read += bytes;
/*
* Save temp_brigade in input_brigade. (At least) in the SSL case
* temp_brigade contains transient buckets whose data would get
* overwritten during the next call of ap_get_brigade in the loop.
* ap_save_brigade ensures these buckets to be set aside.
* Calling ap_save_brigade with NULL as filter is OK, because
* input_brigade already has been created and does not need to get
* created by ap_save_brigade.
*/
if (status != APR_SUCCESS) {
"proxy: processing prefetched request body failed"
" to %pI (%s) from %s (%s)",
return status;
}
/* Ensure we don't hit a wall where we have a buffer too small
* for ap_get_brigade's filters to fetch us another bucket,
* surrender once we hit 80 bytes less than MAX_MEM_SPOOL
* (an arbitrary value.)
*/
/* Use chunked request body encoding or send a content-length body?
*
* Prefer C-L when:
*
* We have no request body (handled by RB_STREAM_CL)
*
* We have a request body length <= MAX_MEM_SPOOL
*
* The administrator has setenv force-proxy-request-1.0
*
* The client sent a C-L body, and the administrator has
* not setenv proxy-sendchunked or has set setenv proxy-sendcl
*
* The client sent a T-E body, and the administrator has
* setenv proxy-sendcl, and not setenv proxy-sendchunked
*
* If both proxy-sendcl and proxy-sendchunked are set, the
* behavior is the same as if neither were set, large bodies
* that can't be read will be forwarded in their original
* form of C-L, or T-E.
*
* To ensure maximum compatibility, setenv proxy-sendcl
* To reduce server resource use, setenv proxy-sendchunked
*
* Then address specific servers with conditional setenv
* options to restore the default behavior where desireable.
*
* 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. Chunked is always preferable.
*
* We can only trust the client-provided C-L if the T-E header
* is absent, and the filters are unchanged (the body won't
* be resized by another content filter).
*/
/* The whole thing fit, so our decision is trivial, use
* the filtered bytes read from the client for the request
* body Content-Length.
*
* If we expected no body, and read no body, do not set
* the Content-Length.
*/
}
}
else if (old_te_val) {
if (force10
}
else {
}
}
else if (old_cl_val) {
if (r->input_filters == r->proto_input_filters) {
}
else if (!force10
}
else {
}
}
else {
/* This is an appropriate default; very efficient for no-body
* requests, and has the behavior that it will not add any C-L
* when the old_cl_val is NULL.
*/
}
/* Yes I hate gotos. This is the subrequest shortcut */
/* Handle Connection: header */
}
/* send the request body, if any. */
switch(rb_method) {
case RB_STREAM_CHUNKED:
break;
case RB_STREAM_CL:
break;
case RB_SPOOL_CL:
|| (old_te_val != NULL)
|| (bytes_read > 0));
break;
default:
/* shouldn't be possible */
status = APR_EINVAL;
break;
}
if (status != APR_SUCCESS) {
"proxy: pass request body failed to %pI (%s)"
" from %s (%s)",
c->remote_ip,
return status;
}
return APR_SUCCESS;
}
{
static const char* date_hdrs[]
static const struct {
const char* name;
} 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 } ,
} ;
int i ;
for ( i = 0 ; date_hdrs[i] ; ++i ) {
return ;
}
}
for ( i = 0 ; transform_hdrs[i].name ; ++i ) {
return ;
}
}
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.
*/
{
int len;
char field[MAX_STRING_LEN];
int saw_headers = 0;
*pread_len = 0;
/*
* Read header lines until we get the empty separator line, a read error,
* the connection closes (EOF), or we timeout.
*/
/* 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 */
/* Nope, it wasn't even an extra HTTP header. Give up. */
r->headers_out = NULL;
return ;
}
/* 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) {
"proxy: Starting body due to bogus non-header in headers "
return ;
} else {
"proxy: No HTTP headers "
return ;
}
}
}
/* this is the psc->badopt == bad_ignore case */
"proxy: Ignoring bogus HTTP header "
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 */
end)
*end = '\0';
/* make sure we add so as not to destroy duplicated headers
* by ProxyPassReverse and family with process_proxy_header
*/
saw_headers = 1;
/* the header was too long; at the least we should skip extra data */
>= MAX_STRING_LEN - 1) {
/* soak up the extra data */
}
if (len == 0) /* time to exit the larger loop as well */
break;
}
}
}
{
return 1;
}
static
char *server_portstr) {
conn_rec *c = r->connection;
char buffer[HUGE_STRING_LEN];
const char *buf;
char keepchar;
apr_bucket *e;
int len, backasswards;
int interim_response; /* non-zero whilst interim 1xx responses
* are being read. */
int pread_len = 0;
int backend_broke = 0;
/* Get response from the remote server, and pass it up the
* filter chain
*/
/* In case anyone needs to know, this is a fake request that is really a
* response.
*/
do {
if (len == 0) {
/* handle one potential stray CRLF */
}
if (len <= 0) {
"proxy: error reading status line from remote "
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
/* XXX: Is this a real headers length send from remote? */
/* Is it an HTTP/1 response?
* This is buggy if we ever see an HTTP/1.10
*/
major = 1;
minor = 1;
}
/* If not an HTTP/1 message or
* if the status line was > 8192 bytes
*/
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
apr_pstrcat(p, "Corrupt status line returned by remote "
}
backasswards = 0;
if (keepchar != '\0') {
} else {
/* 2616 requires the space in Status-Line; the origin
* server may have sent one but ap_rgetline_core will
* have stripped it. */
}
/* 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 */
"Set-Cookie", NULL);
/* shove the headers direct into r->headers_out */
&pread_len);
if (r->headers_out == NULL) {
r->server, "proxy: bad HTTP/%d.%d header "
r->method);
/*
* 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->status = HTTP_BAD_GATEWAY;
r->status_line = "bad gateway";
return r->status;
}
/* Now, add in the just read cookies */
"Set-Cookie", NULL);
/* and now load 'em all in */
if (!apr_is_empty_table(save_table)) {
r->headers_out,
}
/* can't have both Content-Length and Transfer-Encoding */
/*
* 2616 section 4.4, point 3: "if both Transfer-Encoding
* and Content-Length are received, the latter MUST be
* ignored";
*
* To help mitigate HTTP Splitting, unset Content-Length
* and shut down the backend server connection
* XXX: We aught to treat such a response as uncachable
*/
"proxy: server %s returned Transfer-Encoding"
}
/* strip connection listed hop-by-hop headers from response */
"Connection"),
"close");
ap_proxy_clear_connection(p, r->headers_out);
}
/* handle Via header in response */
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)
/* create a "Via:" response header entry and merge it */
? apr_psprintf(p, "%d.%d %s%s (%s)",
: apr_psprintf(p, "%d.%d %s%s",
);
}
/* cancel keepalive if HTTP/1.0 or less */
}
} else {
/* an http/0.9 response */
backasswards = 1;
r->status = 200;
r->status_line = "200 OK";
}
if (interim_response) {
"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
*/
const char *buf;
const char *wa = "WWW-Authenticate";
} else {
"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) {
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":
*/
}
}
/* send body - but only if a body is expected */
if ((!r->header_only) && /* not HEAD request */
!interim_response && /* not any 1xx response */
/* 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.
*/
"proxy: start body send");
/*
* if we are overriding the errors, we can't put the content
* of the page into the brigade
*/
/* read the body, pass it to the output filters */
do {
/* ap_get_brigade will return success with an empty brigade
* for a non-blocking read which would block: */
if (APR_STATUS_IS_EAGAIN(rv)
/* flush to the client and switch to blocking mode */
e = apr_bucket_flush_create(c->bucket_alloc);
|| c->aborted) {
break;
}
continue;
}
break;
}
else if (rv != APR_SUCCESS) {
/* In this case, we are in real trouble because
* our backend bailed on us. Pass along a 502 error
* error bucket
*/
"proxy: error reading response");
ap_proxy_backend_broke(r, bb);
backend_broke = 1;
break;
}
/* next time try a non-blocking read */
#if DEBUGGING
{
r->server, "proxy (PID %d): readbytes: %#x",
}
#endif
/* sanity check */
if (APR_BRIGADE_EMPTY(bb)) {
break;
}
/* found the last brigade? */
/* 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
*/
/* signal that we must leave */
}
/* try send what we read */
|| c->aborted) {
/* Ack! Phbtt! Die! User aborted! */
}
/* make sure we always clean up after ourselves */
} while (!finish);
}
"proxy: end body send");
}
else if (!interim_response) {
"proxy: header only");
/* Pass EOS bucket down the filter chain. */
e = apr_bucket_eos_create(c->bucket_alloc);
|| c->aborted) {
/* Ack! Phbtt! Die! User aborted! */
}
}
} while (interim_response);
/* If our connection with the client is to be aborted, return DONE. */
if (c->aborted || backend_broke) {
return DONE;
}
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
*/
/* Discard body, if one is expected */
}
return status;
}
} else
return OK;
}
static
{
/* 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
*/
}
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 status;
char server_portstr[32];
char *scheme;
const char *proxy_function;
const char *u;
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.
*/
conn_rec *c = r->connection;
/* find the scheme */
return DECLINED;
if ((u - url) > 14)
return HTTP_BAD_REQUEST;
/* scheme is lowercase */
/* is it for us? */
if (!ap_proxy_ssl_enable(NULL)) {
"proxy: HTTPS: declining URL %s"
" (mod_ssl not configured?)", url);
return DECLINED;
}
is_ssl = 1;
proxy_function = "HTTPS";
}
"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";
}
"proxy: HTTP: serving URL %s", url);
/* only use stored info for top-level pages. Sub requests don't share
* in keepalives
*/
if (!r->main) {
}
/* create space for state information */
if (!backend) {
goto cleanup;
if (!r->main) {
}
}
/* Step One: Determine Who To Connect To */
sizeof(server_portstr))) != OK)
goto cleanup;
/* Step Two: Make the Connection */
if (r->proxyreq == PROXYREQ_PROXY)
else
goto cleanup;
}
/* Step Three: Create conn_rec */
if (!backend->connection) {
goto cleanup;
}
/* Step Four: Send the Request */
goto cleanup;
/* Step Five: Receive the Response */
goto cleanup;
/* Step Six: Clean Up */
if (backend) {
}
}
return status;
}
static void ap_proxy_http_register_hook(apr_pool_t *p)
{
}
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 */
};