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DEFINITIONS
This source file includes following definitions.
- proxy_http_canon
- clean_warning_headers
- ap_proxy_clean_warnings
- clear_conn_headers
- ap_proxy_clear_connection
- add_te_chunked
- add_cl
- terminate_headers
- pass_brigade
- stream_reqbody_chunked
- stream_reqbody_cl
- spool_reqbody_cl
- ap_proxy_http_request
- process_proxy_header
- ap_proxy_read_headers
- addit_dammit
- ap_proxygetline
- ap_proxy_http_process_response
- ap_proxy_http_cleanup
- proxy_http_handler
- warn_rx_free
- ap_proxy_http_register_hook
/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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"
#include "ap_regex.h"
module AP_MODULE_DECLARE_DATA proxy_http_module;
static apr_status_t ap_proxy_http_cleanup(const char *scheme,
request_rec *r,
proxy_conn_rec *backend);
/*
* 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.
*/
static int proxy_http_canon(request_rec *r, char *url)
{
char *host, *path, sport[7];
char *search = NULL;
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:
* process the path.
*
* In a reverse proxy, our URL has been processed, so canonicalise
* unless proxy-nocanon is set to say it's raw
* In a forward proxy, we have and MUST NOT MANGLE the original.
*/
switch (r->proxyreq) {
default: /* wtf are we doing here? */
case PROXYREQ_REVERSE:
if (apr_table_get(r->notes, "proxy-nocanon")) {
path = url; /* this is the raw path */
}
else {
path = ap_proxy_canonenc(r->pool, url, strlen(url),
enc_path, 0, r->proxyreq);
search = r->args;
}
break;
case PROXYREQ_PROXY:
path = url;
break;
}
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 */
typedef struct header_dptr {
apr_pool_t *pool;
apr_table_t *table;
apr_time_t time;
} header_dptr;
static ap_regex_t *warn_rx;
static int clean_warning_headers(void *data, const char *key, const char *val)
{
apr_table_t *headers = ((header_dptr*)data)->table;
apr_pool_t *pool = ((header_dptr*)data)->pool;
char *warning;
char *date;
apr_time_t warn_time;
const int nmatch = 3;
ap_regmatch_t pmatch[3];
if (headers == NULL) {
((header_dptr*)data)->table = headers = apr_table_make(pool, 2);
}
/*
* Parse this, suckers!
*
* Warning = "Warning" ":" 1#warning-value
*
* warning-value = warn-code SP warn-agent SP warn-text
* [SP warn-date]
*
* warn-code = 3DIGIT
* warn-agent = ( host [ ":" port ] ) | pseudonym
* ; the name or pseudonym of the server adding
* ; the Warning header, for use in debugging
* warn-text = quoted-string
* warn-date = <"> HTTP-date <">
*
* Buggrit, use a bloomin' regexp!
* (\d{3}\s+\S+\s+\".*?\"(\s+\"(.*?)\")?) --> whole in $1, date in $3
*/
while (!ap_regexec(warn_rx, val, nmatch, pmatch, 0)) {
warning = apr_pstrndup(pool, val+pmatch[0].rm_so,
pmatch[0].rm_eo - pmatch[0].rm_so);
warn_time = 0;
if (pmatch[2].rm_eo > pmatch[2].rm_so) {
/* OK, we have a date here */
date = apr_pstrndup(pool, val+pmatch[2].rm_so,
pmatch[2].rm_eo - pmatch[2].rm_so);
warn_time = apr_date_parse_http(date);
}
if (!warn_time || (warn_time == ((header_dptr*)data)->time)) {
apr_table_addn(headers, key, warning);
}
val += pmatch[0].rm_eo;
}
return 1;
}
static apr_table_t *ap_proxy_clean_warnings(apr_pool_t *p, apr_table_t *headers)
{
header_dptr x;
x.pool = p;
x.table = NULL;
x.time = apr_date_parse_http(apr_table_get(headers, "Date"));
apr_table_do(clean_warning_headers, &x, headers, "Warning", NULL);
if (x.table != NULL) {
apr_table_unset(headers, "Warning");
return apr_table_overlay(p, headers, x.table);
}
else {
return headers;
}
}
static int clear_conn_headers(void *data, const char *key, const char *val)
{
apr_table_t *headers = ((header_dptr*)data)->table;
apr_pool_t *pool = ((header_dptr*)data)->pool;
const char *name;
char *next = apr_pstrdup(pool, val);
while (*next) {
name = next;
while (*next && !apr_isspace(*next) && (*next != ',')) {
++next;
}
while (*next && (apr_isspace(*next) || (*next == ','))) {
*next++ = '\0';
}
apr_table_unset(headers, name);
}
return 1;
}
static void ap_proxy_clear_connection(apr_pool_t *p, apr_table_t *headers)
{
header_dptr x;
x.pool = p;
x.table = headers;
apr_table_unset(headers, "Proxy-Connection");
apr_table_do(clear_conn_headers, &x, headers, "Connection", NULL);
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 int pass_brigade(apr_bucket_alloc_t *bucket_alloc,
request_rec *r, proxy_conn_rec *conn,
conn_rec *origin, apr_bucket_brigade *bb,
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(bb, e);
}
apr_brigade_length(bb, 0, &transferred);
if (transferred != -1)
conn->worker->s->transferred += transferred;
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 body failed to %pI (%s)",
conn->addr, conn->hostname);
if (origin->aborted) {
return APR_STATUS_IS_TIMEUP(status) ? HTTP_GATEWAY_TIME_OUT : HTTP_BAD_GATEWAY;
}
else {
return HTTP_BAD_REQUEST;
}
}
apr_brigade_cleanup(bb);
return OK;
}
#define MAX_MEM_SPOOL 16384
static int stream_reqbody_chunked(apr_pool_t *p,
request_rec *r,
proxy_conn_rec *p_conn,
conn_rec *origin,
apr_bucket_brigade *header_brigade,
apr_bucket_brigade *input_brigade)
{
int seen_eos = 0, rv = OK;
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 *bb;
apr_bucket *e;
add_te_chunked(p, bucket_alloc, header_brigade);
terminate_headers(bucket_alloc, header_brigade);
while (!APR_BUCKET_IS_EOS(APR_BRIGADE_FIRST(input_brigade)))
{
char chunk_hdr[20]; /* must be here due to transient bucket. */
/* If this brigade contains EOS, either stop or remove it. */
if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
seen_eos = 1;
/* 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
*/
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.
*/
status = ap_save_brigade(NULL, &bb, &input_brigade, p);
if (status != APR_SUCCESS) {
return HTTP_INTERNAL_SERVER_ERROR;
}
header_brigade = NULL;
}
else {
bb = input_brigade;
}
/* The request is flushed below this loop with chunk EOS header */
rv = pass_brigade(bucket_alloc, r, p_conn, origin, bb, 0);
if (rv != OK) {
return rv;
}
if (seen_eos) {
break;
}
status = ap_get_brigade(r->input_filters, input_brigade,
AP_MODE_READBYTES, APR_BLOCK_READ,
HUGE_STRING_LEN);
if (status != APR_SUCCESS) {
return HTTP_BAD_REQUEST;
}
}
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. */
e = APR_BRIGADE_LAST(input_brigade);
AP_DEBUG_ASSERT(APR_BUCKET_IS_EOS(e));
apr_bucket_delete(e);
}
bb = input_brigade;
}
e = apr_bucket_immortal_create(ASCII_ZERO ASCII_CRLF
/* <trailers> */
ASCII_CRLF,
5, bucket_alloc);
APR_BRIGADE_INSERT_TAIL(bb, e);
/* Now we have headers-only, or the chunk EOS mark; flush it */
rv = pass_brigade(bucket_alloc, r, p_conn, origin, bb, 1);
return rv;
}
static int stream_reqbody_cl(apr_pool_t *p,
request_rec *r,
proxy_conn_rec *p_conn,
conn_rec *origin,
apr_bucket_brigade *header_brigade,
apr_bucket_brigade *input_brigade,
const char *old_cl_val)
{
int seen_eos = 0, rv = 0;
apr_status_t status = APR_SUCCESS;
apr_bucket_alloc_t *bucket_alloc = r->connection->bucket_alloc;
apr_bucket_brigade *bb;
apr_bucket *e;
apr_off_t cl_val = 0;
apr_off_t bytes;
apr_off_t bytes_streamed = 0;
if (old_cl_val) {
add_cl(p, bucket_alloc, header_brigade, old_cl_val);
if (APR_SUCCESS != (status = apr_strtoff(&cl_val, old_cl_val, NULL,
0))) {
return HTTP_INTERNAL_SERVER_ERROR;
}
}
terminate_headers(bucket_alloc, header_brigade);
while (!APR_BUCKET_IS_EOS(APR_BRIGADE_FIRST(input_brigade)))
{
apr_brigade_length(input_brigade, 1, &bytes);
bytes_streamed += bytes;
/* If this brigade contains EOS, either stop or remove it. */
if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
seen_eos = 1;
/* We can't pass this EOS to the output_filters. */
e = APR_BRIGADE_LAST(input_brigade);
apr_bucket_delete(e);
}
/* 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.
*/
status = ap_save_brigade(NULL, &bb, &input_brigade, p);
if (status != APR_SUCCESS) {
return HTTP_INTERNAL_SERVER_ERROR;
}
header_brigade = NULL;
}
else {
bb = input_brigade;
}
/* Once we hit EOS, we are ready to flush. */
rv = pass_brigade(bucket_alloc, r, p_conn, origin, bb, seen_eos);
if (rv != OK) {
return rv ;
}
if (seen_eos) {
break;
}
status = ap_get_brigade(r->input_filters, input_brigade,
AP_MODE_READBYTES, APR_BLOCK_READ,
HUGE_STRING_LEN);
if (status != APR_SUCCESS) {
return HTTP_BAD_REQUEST;
}
}
if (bytes_streamed != cl_val) {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
"proxy: client %s given Content-Length did not match"
" number of body bytes read", r->connection->remote_ip);
return HTTP_BAD_REQUEST;
}
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(pass_brigade(bucket_alloc, r, p_conn, origin, bb, 1));
}
return OK;
}
static int spool_reqbody_cl(apr_pool_t *p,
request_rec *r,
proxy_conn_rec *p_conn,
conn_rec *origin,
apr_bucket_brigade *header_brigade,
apr_bucket_brigade *input_brigade,
int force_cl)
{
int seen_eos = 0;
apr_status_t status;
apr_bucket_alloc_t *bucket_alloc = r->connection->bucket_alloc;
apr_bucket_brigade *body_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);
while (!APR_BUCKET_IS_EOS(APR_BRIGADE_FIRST(input_brigade)))
{
/* If this brigade contains EOS, either stop or remove it. */
if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
seen_eos = 1;
/* 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 */
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 HTTP_INTERNAL_SERVER_ERROR;
}
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 HTTP_INTERNAL_SERVER_ERROR;
}
}
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 HTTP_INTERNAL_SERVER_ERROR;
}
AP_DEBUG_ASSERT(bytes_read == bytes_written);
fsize += bytes_written;
}
apr_brigade_cleanup(input_brigade);
}
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.
*/
status = ap_save_brigade(NULL, &body_brigade, &input_brigade, p);
if (status != APR_SUCCESS) {
return HTTP_INTERNAL_SERVER_ERROR;
}
}
bytes_spooled += bytes;
if (seen_eos) {
break;
}
status = ap_get_brigade(r->input_filters, input_brigade,
AP_MODE_READBYTES, APR_BLOCK_READ,
HUGE_STRING_LEN);
if (status != APR_SUCCESS) {
return HTTP_BAD_REQUEST;
}
}
if (bytes_spooled || force_cl) {
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);
}
/* This is all a single brigade, pass with flush flagged */
return(pass_brigade(bucket_alloc, r, p_conn, origin, header_brigade, 1));
}
static
int ap_proxy_http_request(apr_pool_t *p, request_rec *r,
proxy_conn_rec *p_conn, conn_rec *origin,
proxy_server_conf *conf,
apr_uri_t *uri,
char *url, char *server_portstr)
{
conn_rec *c = r->connection;
apr_bucket_alloc_t *bucket_alloc = c->bucket_alloc;
apr_bucket_brigade *header_brigade;
apr_bucket_brigade *input_brigade;
apr_bucket_brigade *temp_brigade;
apr_bucket *e;
char *buf;
const apr_array_header_t *headers_in_array;
const apr_table_entry_t *headers_in;
int counter;
apr_status_t status;
enum rb_methods {RB_INIT, RB_STREAM_CL, RB_STREAM_CHUNKED, RB_SPOOL_CL};
enum rb_methods rb_method = RB_INIT;
const char *old_cl_val = NULL;
const char *old_te_val = NULL;
apr_off_t bytes_read = 0;
apr_off_t bytes;
int force10, rv;
apr_table_t *headers_in_copy;
header_brigade = apr_brigade_create(p, origin->bucket_alloc);
/*
* Send the HTTP/1.1 request to the remote server
*/
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;
p_conn->close++;
} else {
buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.1" CRLF, NULL);
force10 = 0;
}
if (apr_table_get(r->subprocess_env, "proxy-nokeepalive")) {
origin->keepalive = AP_CONN_CLOSE;
p_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",
c->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);
}
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.
*/
headers_in_copy = apr_table_copy(r->pool, r->headers_in);
ap_proxy_clear_connection(p, headers_in_copy);
/* send request headers */
headers_in_array = apr_table_elts(headers_in_copy);
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
/* Already sent */
|| !strcasecmp(headers_in[counter].key, "Host")
/* Clear out hop-by-hop request headers not to send
* RFC2616 13.5.1 says we should strip these headers
*/
|| !strcasecmp(headers_in[counter].key, "Keep-Alive")
|| !strcasecmp(headers_in[counter].key, "TE")
|| !strcasecmp(headers_in[counter].key, "Trailer")
|| !strcasecmp(headers_in[counter].key, "Upgrade")
) {
continue;
}
/* Do we want to strip Proxy-Authorization ?
* If we haven't used it, then NO
* If we have used it then MAYBE: RFC2616 says we MAY propagate it.
* So let's make it configurable by env.
*/
if (!strcasecmp(headers_in[counter].key,"Proxy-Authorization")) {
if (r->user != NULL) { /* we've authenticated */
if (!apr_table_get(r->subprocess_env, "Proxy-Chain-Auth")) {
continue;
}
}
}
/* Skip Transfer-Encoding and Content-Length for now.
*/
if (!strcasecmp(headers_in[counter].key, "Transfer-Encoding")) {
old_te_val = headers_in[counter].val;
continue;
}
if (!strcasecmp(headers_in[counter].key, "Content-Length")) {
old_cl_val = headers_in[counter].val;
continue;
}
/* for sub-requests, ignore freshness/expiry headers */
if (r->main) {
if ( !strcasecmp(headers_in[counter].key, "If-Match")
|| !strcasecmp(headers_in[counter].key, "If-Modified-Since")
|| !strcasecmp(headers_in[counter].key, "If-Range")
|| !strcasecmp(headers_in[counter].key, "If-Unmodified-Since")
|| !strcasecmp(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);
}
/* We have headers, let's figure out our request body... */
input_brigade = apr_brigade_create(p, bucket_alloc);
/* 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? */
p_conn->close++;
if (old_cl_val) {
old_cl_val = NULL;
apr_table_unset(r->headers_in, "Content-Length");
}
if (old_te_val) {
old_te_val = NULL;
apr_table_unset(r->headers_in, "Transfer-Encoding");
}
rb_method = RB_STREAM_CL;
e = apr_bucket_eos_create(input_brigade->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(input_brigade, e);
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
*/
if (old_te_val && strcmp(old_te_val, "chunked") != 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
"proxy: %s Transfer-Encoding is not supported",
old_te_val);
return HTTP_INTERNAL_SERVER_ERROR;
}
if (old_cl_val && old_te_val) {
ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_ENOTIMPL, r->server,
"proxy: client %s (%s) requested Transfer-Encoding "
"chunked body with Content-Length (C-L ignored)",
c->remote_ip, c->remote_host ? c->remote_host: "");
apr_table_unset(r->headers_in, "Content-Length");
old_cl_val = NULL;
origin->keepalive = AP_CONN_CLOSE;
p_conn->close++;
}
/* 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.
*/
temp_brigade = apr_brigade_create(p, bucket_alloc);
do {
status = ap_get_brigade(r->input_filters, temp_brigade,
AP_MODE_READBYTES, APR_BLOCK_READ,
MAX_MEM_SPOOL - bytes_read);
if (status != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
"proxy: prefetch request body failed to %pI (%s)"
" from %s (%s)",
p_conn->addr, p_conn->hostname ? p_conn->hostname: "",
c->remote_ip, c->remote_host ? c->remote_host: "");
return HTTP_BAD_REQUEST;
}
apr_brigade_length(temp_brigade, 1, &bytes);
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.
*/
status = ap_save_brigade(NULL, &input_brigade, &temp_brigade, p);
if (status != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
"proxy: processing prefetched request body failed"
" to %pI (%s) from %s (%s)",
p_conn->addr, p_conn->hostname ? p_conn->hostname: "",
c->remote_ip, c->remote_host ? c->remote_host: "");
return HTTP_INTERNAL_SERVER_ERROR;
}
/* 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.)
*/
} while ((bytes_read < MAX_MEM_SPOOL - 80)
&& !APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade)));
/* 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).
*/
if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
/* 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.
*/
if (old_cl_val || old_te_val || bytes_read) {
old_cl_val = apr_off_t_toa(r->pool, bytes_read);
}
rb_method = RB_STREAM_CL;
}
else if (old_te_val) {
if (force10
|| (apr_table_get(r->subprocess_env, "proxy-sendcl")
&& !apr_table_get(r->subprocess_env, "proxy-sendchunks")
&& !apr_table_get(r->subprocess_env, "proxy-sendchunked"))) {
rb_method = RB_SPOOL_CL;
}
else {
rb_method = RB_STREAM_CHUNKED;
}
}
else if (old_cl_val) {
if (r->input_filters == r->proto_input_filters) {
rb_method = RB_STREAM_CL;
}
else if (!force10
&& (apr_table_get(r->subprocess_env, "proxy-sendchunks")
|| apr_table_get(r->subprocess_env, "proxy-sendchunked"))
&& !apr_table_get(r->subprocess_env, "proxy-sendcl")) {
rb_method = RB_STREAM_CHUNKED;
}
else {
rb_method = RB_SPOOL_CL;
}
}
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.
*/
rb_method = RB_SPOOL_CL;
}
/* Yes I hate gotos. This is the subrequest shortcut */
skip_body:
/*
* Handle Connection: header if we do HTTP/1.1 request:
* If we plan to close the backend connection sent Connection: close
* otherwise sent Connection: Keep-Alive.
*/
if (!force10) {
if (p_conn->close || p_conn->close_on_recycle) {
buf = apr_pstrdup(p, "Connection: close" CRLF);
}
else {
buf = apr_pstrdup(p, "Connection: Keep-Alive" CRLF);
}
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 body, if any. */
switch(rb_method) {
case RB_STREAM_CHUNKED:
rv = stream_reqbody_chunked(p, r, p_conn, origin, header_brigade,
input_brigade);
break;
case RB_STREAM_CL:
rv = stream_reqbody_cl(p, r, p_conn, origin, header_brigade,
input_brigade, old_cl_val);
break;
case RB_SPOOL_CL:
rv = spool_reqbody_cl(p, r, p_conn, origin, header_brigade,
input_brigade, (old_cl_val != NULL)
|| (old_te_val != NULL)
|| (bytes_read > 0));
break;
default:
/* shouldn't be possible */
rv = HTTP_INTERNAL_SERVER_ERROR ;
break;
}
if (rv != OK) {
/* apr_errno value has been logged in lower level method */
ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
"proxy: pass request body failed to %pI (%s)"
" from %s (%s)",
p_conn->addr,
p_conn->hostname ? p_conn->hostname: "",
c->remote_ip,
c->remote_host ? c->remote_host: "");
return rv;
}
return OK;
}
static void process_proxy_header(request_rec* r, proxy_dir_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;
proxy_dir_conf *dconf;
dconf = ap_get_module_config(r->per_dir_config, &proxy_module);
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. */
r->headers_out = NULL;
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, dconf, 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_proxygetline(apr_bucket_brigade *bb, char *s, int n, request_rec *r,
int fold, int *writen)
{
char *tmp_s = s;
apr_status_t rv;
apr_size_t len;
rv = ap_rgetline(&tmp_s, n, &len, r, fold, bb);
apr_brigade_cleanup(bb);
if (rv == APR_SUCCESS) {
*writen = (int) len;
} else if (rv == APR_ENOSPC) {
*writen = n;
} else {
*writen = -1;
}
return rv;
}
/*
* Limit the number of interim respones we sent back to the client. Otherwise
* we suffer from a memory build up. Besides there is NO sense in sending back
* an unlimited number of interim responses to the client. Thus if we cross
* this limit send back a 502 (Bad Gateway).
*/
#ifndef AP_MAX_INTERIM_RESPONSES
#define AP_MAX_INTERIM_RESPONSES 10
#endif
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];
const char *buf;
char keepchar;
request_rec *rp;
apr_bucket *e;
apr_bucket_brigade *bb, *tmp_bb;
int len, backasswards;
int interim_response = 0; /* non-zero whilst interim 1xx responses
* are being read. */
int pread_len = 0;
apr_table_t *save_table;
int backend_broke = 0;
static const char *hop_by_hop_hdrs[] =
{"Keep-Alive", "Proxy-Authenticate", "TE", "Trailer", "Upgrade", NULL};
int i;
const char *te = NULL;
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;
tmp_bb = apr_brigade_create(p, c->bucket_alloc);
do {
apr_status_t rc;
apr_brigade_cleanup(bb);
rc = ap_proxygetline(tmp_bb, buffer, sizeof(buffer), rp, 0, &len);
if (len == 0) {
/* handle one potential stray CRLF */
rc = ap_proxygetline(tmp_bb, buffer, sizeof(buffer), rp, 0, &len);
}
if (len <= 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r,
"proxy: error reading status line from remote "
"server %s", backend->hostname);
/*
* If we are a reverse proxy request shutdown the connection
* WITHOUT ANY response to trigger a retry by the client
* if allowed (as for idempotent requests).
* BUT currently we should not do this if the request is the
* first request on a keepalive connection as browsers like
* seamonkey only display an empty page in this case and do
* not do a retry.
*/
if (r->proxyreq == PROXYREQ_REVERSE && c->keepalives) {
apr_bucket *eos;
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
"proxy: Closing connection to client because"
" reading from backend server %s failed. Number"
" of keepalives %i", backend->hostname,
c->keepalives);
ap_proxy_backend_broke(r, bb);
/*
* Add an EOC bucket to signal the ap_http_header_filter
* that it should get out of our way, BUT ensure that the
* EOC bucket is inserted BEFORE an EOS bucket in bb as
* some resource filters like mod_deflate pass everything
* up to the EOS down the chain immediately and sent the
* remainder of the brigade later (or even never). But in
* this case the ap_http_header_filter does not get out of
* our way soon enough.
*/
e = ap_bucket_eoc_create(c->bucket_alloc);
eos = APR_BRIGADE_LAST(bb);
while ((APR_BRIGADE_SENTINEL(bb) != eos)
&& !APR_BUCKET_IS_EOS(eos)) {
eos = APR_BUCKET_PREV(eos);
}
if (eos == APR_BRIGADE_SENTINEL(bb)) {
APR_BRIGADE_INSERT_TAIL(bb, e);
}
else {
APR_BUCKET_INSERT_BEFORE(eos, e);
}
ap_pass_brigade(r->output_filters, bb);
/* Need to return OK to avoid sending an error message */
return OK;
}
else if (!c->keepalives) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
"proxy: NOT Closing connection to client"
" although reading from backend server %s"
" failed.", 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)) {
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;
}
/* 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);
}
/* can't have both Content-Length and Transfer-Encoding */
if (apr_table_get(r->headers_out, "Transfer-Encoding")
&& apr_table_get(r->headers_out, "Content-Length")) {
/*
* 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
*/
apr_table_unset(r->headers_out, "Content-Length");
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
"proxy: server %s returned Transfer-Encoding"
" and Content-Length", backend->hostname);
backend->close += 1;
}
/*
* Save a possible Transfer-Encoding header as we need it later for
* ap_http_filter to know where to end.
*/
te = apr_table_get(r->headers_out, "Transfer-Encoding");
/* 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));
}
if (!ap_is_HTTP_INFO(r->status)) {
ap_proxy_pre_http_request(origin, rp);
}
/* Clear hop-by-hop headers */
for (i=0; hop_by_hop_hdrs[i]; ++i) {
apr_table_unset(r->headers_out, hop_by_hop_hdrs[i]);
}
/* Delete warnings with wrong date */
r->headers_out = ap_proxy_clean_warnings(p, r->headers_out);
/* 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_addn(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;
}
if (ap_is_HTTP_INFO(r->status)) {
interim_response++;
}
else {
interim_response = 0;
}
if (interim_response) {
/* RFC2616 tells us to forward this.
*
* OTOH, an interim response here may mean the backend
* is playing sillybuggers. The Client didn't ask for
* it within the defined HTTP/1.1 mechanisms, and if
* it's an extension, it may also be unsupported by us.
*
* There's also the possibility that changing existing
* behaviour here might break something.
*
* So let's make it configurable.
*/
const char *policy = apr_table_get(r->subprocess_env,
"proxy-interim-response");
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL,
"proxy: HTTP: received interim %d response",
r->status);
if (!policy || !strcasecmp(policy, "RFC")) {
ap_send_interim_response(r, 1);
}
/* FIXME: refine this to be able to specify per-response-status
* policies and maybe also add option to bail out with 502
*/
else if (strcasecmp(policy, "Suppress")) {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, NULL,
"undefined proxy interim response policy");
}
}
/* 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)) {
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);
/*
* Restore Transfer-Encoding header from response if we saved
* one before and there is none left. We need it for the
* ap_http_filter. See above.
*/
if (te && !apr_table_get(rp->headers_in, "Transfer-Encoding")) {
apr_table_add(rp->headers_in, "Transfer-Encoding", te);
}
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 || !ap_is_HTTP_ERROR(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_EOF) {
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
*/
ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c,
"proxy: error reading response");
ap_proxy_backend_broke(r, bb);
ap_pass_brigade(r->output_filters, bb);
backend_broke = 1;
backend->close = 1;
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))) {
/* 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 if (!interim_response) {
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
"proxy: header only");
/* Pass EOS bucket down the filter chain. */
e = apr_bucket_eos_create(c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(bb, e);
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 */
}
apr_brigade_cleanup(bb);
}
} while (interim_response && (interim_response < AP_MAX_INTERIM_RESPONSES));
/* See define of AP_MAX_INTERIM_RESPONSES for why */
if (interim_response >= AP_MAX_INTERIM_RESPONSES) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
apr_psprintf(p,
"Too many (%d) interim responses from origin server",
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_ERROR(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 (!r->header_only && /* not HEAD request */
(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)
{
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);
/* create space for state information */
if ((status = ap_proxy_acquire_connection(proxy_function, &backend,
worker, r->server)) != OK)
goto cleanup;
backend->is_ssl = is_ssl;
if (is_ssl) {
ap_proxy_ssl_connection_cleanup(backend, r);
}
/* 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;
ap_proxy_http_cleanup(proxy_function, r, backend);
}
return status;
}
static apr_status_t warn_rx_free(void *p)
{
ap_pregfree((apr_pool_t*)p, warn_rx);
return APR_SUCCESS;
}
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);
warn_rx = ap_pregcomp(p, "[0-9]{3}[ \t]+[^ \t]+[ \t]+\"[^\"]*\"([ \t]+\"([^\"]+)\")?", 0);
apr_pool_cleanup_register(p, p, warn_rx_free, apr_pool_cleanup_null);
}
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 */
};