+++ /dev/null
-/* 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
- *
- * 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"
-
-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, *search, sport[7];
- 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 *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);
- return status;
- }
- apr_brigade_cleanup(bb);
- return APR_SUCCESS;
-}
-
-#define MAX_MEM_SPOOL 16384
-
-static apr_status_t 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;
- 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;
- APR_BRIGADE_CONCAT(bb, input_brigade);
- header_brigade = NULL;
- }
- else {
- bb = input_brigade;
- }
-
- status = pass_brigade(bucket_alloc, r, p_conn, origin, bb, 0);
- if (status != APR_SUCCESS) {
- return status;
- }
-
- 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 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. */
- 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);
- bb = input_brigade;
- }
-
- status = pass_brigade(bucket_alloc, r, p_conn, origin, bb, 1);
- return status;
-}
-
-static apr_status_t 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;
- apr_status_t status;
- 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);
- cl_val = atol(old_cl_val);
- }
- 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;
-
- /* 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);
- }
-
- /* 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;
- APR_BRIGADE_CONCAT(bb, input_brigade);
- header_brigade = NULL;
- }
- else {
- bb = input_brigade;
- }
-
- status = pass_brigade(bucket_alloc, r, p_conn, origin, bb, 0);
- if (status != APR_SUCCESS) {
- return status;
- }
-
- 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 status;
- }
- }
-
- 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 APR_EOF;
- }
-
- if (header_brigade) {
- /* we never sent the header brigade since there was no request
- * body; send it now
- */
- terminate_headers(bucket_alloc, header_brigade);
- bb = header_brigade;
- }
- else {
- /* need to flush any pending data */
- bb = input_brigade; /* empty now; pass_brigade() will add flush */
- }
- status = pass_brigade(bucket_alloc, r, p_conn, origin, bb, 1);
- return status;
-}
-
-static apr_status_t 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 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;
-
- 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 status;
- }
- }
-
- 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);
- }
- status = pass_brigade(bucket_alloc, r, p_conn, origin, header_brigade, 1);
- return status;
-}
-
-static
-apr_status_t 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;
-
- 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.
- */
- if (ap_proxy_liststr(apr_table_get(r->headers_in,
- "Connection"), "close")) {
- p_conn->close++;
- /* XXX: we are abusing r->headers_in rather than a copy,
- * give the core output handler a clue the client would
- * rather just close.
- */
- c->keepalive = AP_CONN_CLOSE;
- }
- ap_proxy_clear_connection(p, r->headers_in);
-
- /* sub-requests never use keepalives */
- if (r->main) {
- p_conn->close++;
- }
-
- 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);
- }
-
- /* 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
-
- /* 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")
-
- /* 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.
- */
- || !strcasecmp(headers_in[counter].key,"Proxy-Authorization")
- || !strcasecmp(headers_in[counter].key,"Proxy-Authenticate")) {
- 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 (headers_in[counter].key == NULL
- || headers_in[counter].val == NULL
- || !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 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 APR_EINVAL;
- }
-
- /* 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.
- */
- input_brigade = apr_brigade_create(p, bucket_alloc);
- 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 + 1024 - 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 status;
- }
-
- apr_brigade_length(temp_brigade, 1, &bytes);
- APR_BRIGADE_CONCAT(input_brigade, temp_brigade);
- bytes_read += bytes;
-
- /* 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)));
-
- 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: "");
- origin->keepalive = AP_CONN_CLOSE;
- p_conn->close++;
- }
-
- /* 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"))) {
- 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-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;
- }
-
- /* Handle Connection: header */
- if (!force10 && p_conn->close) {
- buf = apr_pstrdup(p, "Connection: close" 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:
- status = stream_reqbody_chunked(p, r, p_conn, origin, header_brigade,
- input_brigade);
- break;
- case RB_STREAM_CL:
- status = stream_reqbody_cl(p, r, p_conn, origin, header_brigade,
- input_brigade, old_cl_val);
- break;
- case RB_SPOOL_CL:
- status = spool_reqbody_cl(p, r, p_conn, origin, header_brigade,
- input_brigade, (old_cl_val != NULL)
- || (old_te_val != NULL)
- || (bytes_read > 0));
- break;
- }
- if (status != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_ERR, status, 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 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. */
- 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, 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];
- const char *buf;
- 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;
- }
-
- /* 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;
- }
-
- /* 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_EOF) {
- break;
- }
- 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 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);
-
- 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 */
-};
-
projects / thirdparty / apache / httpd.git / commitdiff
