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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@534031 13f79535-47bb-0310-9956-ffa450edef68
597 lines
23 KiB
C
597 lines
23 KiB
C
/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* AJP routines for Apache proxy */
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#include "mod_proxy.h"
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#include "ajp.h"
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module AP_MODULE_DECLARE_DATA proxy_ajp_module;
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/*
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* Canonicalise http-like URLs.
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* scheme is the scheme for the URL
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* url is the URL starting with the first '/'
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* def_port is the default port for this scheme.
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*/
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static int proxy_ajp_canon(request_rec *r, char *url)
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{
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char *host, *path, *search, sport[7];
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const char *err;
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apr_port_t port = AJP13_DEF_PORT;
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/* ap_port_of_scheme() */
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if (strncasecmp(url, "ajp:", 4) == 0) {
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url += 4;
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}
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else {
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return DECLINED;
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}
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: AJP: canonicalising URL %s", url);
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/*
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* do syntactic check.
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* We break the URL into host, port, path, search
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*/
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err = ap_proxy_canon_netloc(r->pool, &url, NULL, NULL, &host, &port);
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if (err) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
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"error parsing URL %s: %s",
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url, err);
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return HTTP_BAD_REQUEST;
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}
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/*
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* now parse path/search args, according to rfc1738
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*
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* N.B. if this isn't a true proxy request, then the URL _path_
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* has already been decoded. True proxy requests have
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* r->uri == r->unparsed_uri, and no others have that property.
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*/
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if (r->uri == r->unparsed_uri) {
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search = strchr(url, '?');
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if (search != NULL)
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*(search++) = '\0';
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}
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else
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search = r->args;
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/* process path */
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path = ap_proxy_canonenc(r->pool, url, strlen(url), enc_path, 0,
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r->proxyreq);
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if (path == NULL)
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return HTTP_BAD_REQUEST;
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apr_snprintf(sport, sizeof(sport), ":%d", port);
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if (ap_strchr_c(host, ':')) {
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/* if literal IPv6 address */
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host = apr_pstrcat(r->pool, "[", host, "]", NULL);
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}
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r->filename = apr_pstrcat(r->pool, "proxy:ajp://", host, sport,
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"/", path, (search) ? "?" : "",
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(search) ? search : "", NULL);
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return OK;
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}
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/*
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* XXX: AJP Auto Flushing
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*
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* When processing CMD_AJP13_SEND_BODY_CHUNK AJP messages we will do a poll
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* with FLUSH_WAIT miliseconds timeout to determine if more data is currently
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* available at the backend. If there is no more data available, we flush
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* the data to the client by adding a flush bucket to the brigade we pass
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* up the filter chain.
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* This is only a bandaid to fix the AJP/1.3 protocol shortcoming of not
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* sending (actually not having defined) a flush message, when the data
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* should be flushed to the client. As soon as this protocol shortcoming is
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* fixed this code should be removed.
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*
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* For further discussion see PR37100.
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* http://issues.apache.org/bugzilla/show_bug.cgi?id=37100
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*/
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/*
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* process the request and write the response.
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*/
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static int ap_proxy_ajp_request(apr_pool_t *p, request_rec *r,
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proxy_conn_rec *conn,
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conn_rec *origin,
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proxy_dir_conf *conf,
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apr_uri_t *uri,
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char *url, char *server_portstr)
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{
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apr_status_t status;
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int result;
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apr_bucket *e;
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apr_bucket_brigade *input_brigade;
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apr_bucket_brigade *output_brigade;
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ajp_msg_t *msg;
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apr_size_t bufsiz;
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char *buff;
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apr_uint16_t size;
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const char *tenc;
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int havebody = 1;
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int output_failed = 0;
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int backend_failed = 0;
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apr_off_t bb_len;
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int data_sent = 0;
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int rv = 0;
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apr_int32_t conn_poll_fd;
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apr_pollfd_t *conn_poll;
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proxy_server_conf *psf =
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ap_get_module_config(r->server->module_config, &proxy_module);
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apr_size_t maxsize = AJP_MSG_BUFFER_SZ;
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if (psf->io_buffer_size_set)
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maxsize = psf->io_buffer_size;
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if (maxsize > AJP_MAX_BUFFER_SZ)
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maxsize = AJP_MAX_BUFFER_SZ;
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else if (maxsize < AJP_MSG_BUFFER_SZ)
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maxsize = AJP_MSG_BUFFER_SZ;
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maxsize = APR_ALIGN(maxsize, 1024);
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/*
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* Send the AJP request to the remote server
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*/
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/* send request headers */
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status = ajp_send_header(conn->sock, r, maxsize, uri);
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if (status != APR_SUCCESS) {
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conn->close++;
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ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
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"proxy: AJP: request failed to %pI (%s)",
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conn->worker->cp->addr,
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conn->worker->hostname);
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if (status == AJP_EOVERFLOW)
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return HTTP_BAD_REQUEST;
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else
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return HTTP_SERVICE_UNAVAILABLE;
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}
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/* allocate an AJP message to store the data of the buckets */
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bufsiz = maxsize;
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status = ajp_alloc_data_msg(r->pool, &buff, &bufsiz, &msg);
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if (status != APR_SUCCESS) {
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/* We had a failure: Close connection to backend */
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conn->close++;
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: ajp_alloc_data_msg failed");
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return HTTP_INTERNAL_SERVER_ERROR;
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}
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/* read the first bloc of data */
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input_brigade = apr_brigade_create(p, r->connection->bucket_alloc);
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tenc = apr_table_get(r->headers_in, "Transfer-Encoding");
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if (tenc && (strcasecmp(tenc, "chunked") == 0)) {
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/* The AJP protocol does not want body data yet */
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: request is chunked");
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} else {
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status = ap_get_brigade(r->input_filters, input_brigade,
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AP_MODE_READBYTES, APR_BLOCK_READ,
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maxsize - AJP_HEADER_SZ);
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if (status != APR_SUCCESS) {
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/* We had a failure: Close connection to backend */
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conn->close++;
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: ap_get_brigade failed");
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apr_brigade_destroy(input_brigade);
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return HTTP_INTERNAL_SERVER_ERROR;
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}
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/* have something */
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if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: APR_BUCKET_IS_EOS");
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}
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/* Try to send something */
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: data to read (max %" APR_SIZE_T_FMT
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" at %" APR_SIZE_T_FMT ")", bufsiz, msg->pos);
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status = apr_brigade_flatten(input_brigade, buff, &bufsiz);
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if (status != APR_SUCCESS) {
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/* We had a failure: Close connection to backend */
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conn->close++;
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apr_brigade_destroy(input_brigade);
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ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
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"proxy: apr_brigade_flatten");
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return HTTP_INTERNAL_SERVER_ERROR;
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}
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apr_brigade_cleanup(input_brigade);
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: got %" APR_SIZE_T_FMT " bytes of data", bufsiz);
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if (bufsiz > 0) {
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status = ajp_send_data_msg(conn->sock, msg, bufsiz);
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if (status != APR_SUCCESS) {
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/* We had a failure: Close connection to backend */
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conn->close++;
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apr_brigade_destroy(input_brigade);
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ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
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"proxy: send failed to %pI (%s)",
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conn->worker->cp->addr,
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conn->worker->hostname);
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return HTTP_SERVICE_UNAVAILABLE;
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}
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conn->worker->s->transferred += bufsiz;
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}
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}
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/* read the response */
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conn->data = NULL;
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status = ajp_read_header(conn->sock, r, maxsize,
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(ajp_msg_t **)&(conn->data));
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if (status != APR_SUCCESS) {
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/* We had a failure: Close connection to backend */
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conn->close++;
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apr_brigade_destroy(input_brigade);
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ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
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"proxy: read response failed from %pI (%s)",
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conn->worker->cp->addr,
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conn->worker->hostname);
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return HTTP_SERVICE_UNAVAILABLE;
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}
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/* parse the reponse */
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result = ajp_parse_type(r, conn->data);
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output_brigade = apr_brigade_create(p, r->connection->bucket_alloc);
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/*
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* Prepare apr_pollfd_t struct for possible later check if there is currently
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* data available from the backend (do not flush response to client)
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* or not (flush response to client)
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*/
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conn_poll = apr_pcalloc(p, sizeof(apr_pollfd_t));
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conn_poll->reqevents = APR_POLLIN;
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conn_poll->desc_type = APR_POLL_SOCKET;
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conn_poll->desc.s = conn->sock;
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bufsiz = maxsize;
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for (;;) {
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switch (result) {
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case CMD_AJP13_GET_BODY_CHUNK:
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if (havebody) {
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if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
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/* This is the end */
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bufsiz = 0;
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havebody = 0;
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ap_log_error(APLOG_MARK, APLOG_DEBUG, status, r->server,
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"proxy: APR_BUCKET_IS_EOS");
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} else {
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status = ap_get_brigade(r->input_filters, input_brigade,
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AP_MODE_READBYTES,
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APR_BLOCK_READ,
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maxsize - AJP_HEADER_SZ);
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if (status != APR_SUCCESS) {
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ap_log_error(APLOG_MARK, APLOG_DEBUG, status,
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r->server,
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"ap_get_brigade failed");
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output_failed = 1;
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break;
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}
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bufsiz = maxsize;
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status = apr_brigade_flatten(input_brigade, buff,
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&bufsiz);
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apr_brigade_cleanup(input_brigade);
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if (status != APR_SUCCESS) {
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ap_log_error(APLOG_MARK, APLOG_DEBUG, status,
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r->server,
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"apr_brigade_flatten failed");
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output_failed = 1;
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break;
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}
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}
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ajp_msg_reset(msg);
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/* will go in ajp_send_data_msg */
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status = ajp_send_data_msg(conn->sock, msg, bufsiz);
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if (status != APR_SUCCESS) {
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ap_log_error(APLOG_MARK, APLOG_DEBUG, status, r->server,
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"ajp_send_data_msg failed");
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backend_failed = 1;
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break;
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}
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conn->worker->s->transferred += bufsiz;
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} else {
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/*
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* something is wrong TC asks for more body but we are
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* already at the end of the body data
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*/
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"ap_proxy_ajp_request error read after end");
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backend_failed = 1;
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}
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break;
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case CMD_AJP13_SEND_HEADERS:
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/* AJP13_SEND_HEADERS: process them */
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status = ajp_parse_header(r, conf, conn->data);
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if (status != APR_SUCCESS) {
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backend_failed = 1;
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}
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break;
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case CMD_AJP13_SEND_BODY_CHUNK:
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/* AJP13_SEND_BODY_CHUNK: piece of data */
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status = ajp_parse_data(r, conn->data, &size, &buff);
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if (status == APR_SUCCESS) {
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if (size == 0) {
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/* AJP13_SEND_BODY_CHUNK with zero length
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* is explicit flush message
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*/
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e = apr_bucket_flush_create(r->connection->bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(output_brigade, e);
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}
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else {
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e = apr_bucket_transient_create(buff, size,
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r->connection->bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(output_brigade, e);
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if ((conn->worker->flush_packets == flush_on) ||
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((conn->worker->flush_packets == flush_auto) &&
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(apr_poll(conn_poll, 1, &conn_poll_fd,
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conn->worker->flush_wait)
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== APR_TIMEUP) ) ) {
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e = apr_bucket_flush_create(r->connection->bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(output_brigade, e);
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}
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apr_brigade_length(output_brigade, 0, &bb_len);
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if (bb_len != -1)
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conn->worker->s->read += bb_len;
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}
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if (ap_pass_brigade(r->output_filters,
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output_brigade) != APR_SUCCESS) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
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"proxy: error processing body");
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output_failed = 1;
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}
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data_sent = 1;
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apr_brigade_cleanup(output_brigade);
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}
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else {
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backend_failed = 1;
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}
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break;
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case CMD_AJP13_END_RESPONSE:
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e = apr_bucket_eos_create(r->connection->bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(output_brigade, e);
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if (ap_pass_brigade(r->output_filters,
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output_brigade) != APR_SUCCESS) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
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"proxy: error processing end");
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output_failed = 1;
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}
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/* XXX: what about flush here? See mod_jk */
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data_sent = 1;
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break;
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default:
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backend_failed = 1;
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break;
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}
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/*
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* If connection has been aborted by client: Stop working.
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* Nevertheless, we regard our operation so far as a success:
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* So reset output_failed to 0 and set result to CMD_AJP13_END_RESPONSE
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* But: Close this connection to the backend.
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*/
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if (r->connection->aborted) {
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conn->close++;
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output_failed = 0;
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result = CMD_AJP13_END_RESPONSE;
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}
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/*
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* We either have finished successfully or we failed.
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* So bail out
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*/
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if ((result == CMD_AJP13_END_RESPONSE) || backend_failed
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|| output_failed)
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break;
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/* read the response */
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status = ajp_read_header(conn->sock, r, maxsize,
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(ajp_msg_t **)&(conn->data));
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if (status != APR_SUCCESS) {
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backend_failed = 1;
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ap_log_error(APLOG_MARK, APLOG_DEBUG, status, r->server,
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"ajp_read_header failed");
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break;
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}
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result = ajp_parse_type(r, conn->data);
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}
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apr_brigade_destroy(input_brigade);
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/*
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* Clear output_brigade to remove possible buckets that remained there
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* after an error.
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*/
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apr_brigade_cleanup(output_brigade);
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if (backend_failed || output_failed) {
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: Processing of request failed backend: %i, "
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"output: %i", backend_failed, output_failed);
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/* We had a failure: Close connection to backend */
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conn->close++;
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/* Return DONE to avoid error messages being added to the stream */
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if (data_sent) {
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rv = DONE;
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}
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}
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else {
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: got response from %pI (%s)",
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conn->worker->cp->addr,
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conn->worker->hostname);
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rv = OK;
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}
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if (backend_failed) {
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ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
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"proxy: dialog to %pI (%s) failed",
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conn->worker->cp->addr,
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conn->worker->hostname);
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/*
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* If we already send data, signal a broken backend connection
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* upwards in the chain.
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*/
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if (data_sent) {
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ap_proxy_backend_broke(r, output_brigade);
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} else
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rv = HTTP_SERVICE_UNAVAILABLE;
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}
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/*
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* Ensure that we sent an EOS bucket thru the filter chain, if we already
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* have sent some data. Maybe ap_proxy_backend_broke was called and added
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* one to the brigade already (no longer making it empty). So we should
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* not do this in this case.
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*/
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if (data_sent && !r->eos_sent && APR_BRIGADE_EMPTY(output_brigade)) {
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e = apr_bucket_eos_create(r->connection->bucket_alloc);
|
|
APR_BRIGADE_INSERT_TAIL(output_brigade, e);
|
|
}
|
|
|
|
/* If we have added something to the brigade above, sent it */
|
|
if (!APR_BRIGADE_EMPTY(output_brigade))
|
|
ap_pass_brigade(r->output_filters, output_brigade);
|
|
|
|
apr_brigade_destroy(output_brigade);
|
|
|
|
return rv;
|
|
}
|
|
|
|
/*
|
|
* This handles ajp:// URLs
|
|
*/
|
|
static int proxy_ajp_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];
|
|
conn_rec *origin = NULL;
|
|
proxy_conn_rec *backend = NULL;
|
|
const char *scheme = "AJP";
|
|
proxy_dir_conf *dconf = ap_get_module_config(r->per_dir_config,
|
|
&proxy_module);
|
|
|
|
/*
|
|
* 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;
|
|
apr_uri_t *uri = apr_palloc(r->connection->pool, sizeof(*uri));
|
|
|
|
|
|
if (strncasecmp(url, "ajp:", 4) != 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: AJP: declining URL %s", url);
|
|
return DECLINED;
|
|
}
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: AJP: serving URL %s", url);
|
|
|
|
/* create space for state information */
|
|
if (!backend) {
|
|
status = ap_proxy_acquire_connection(scheme, &backend, worker,
|
|
r->server);
|
|
if (status != OK) {
|
|
if (backend) {
|
|
backend->close = 1;
|
|
ap_proxy_release_connection(scheme, backend, r->server);
|
|
}
|
|
return status;
|
|
}
|
|
}
|
|
|
|
backend->is_ssl = 0;
|
|
backend->close = 0;
|
|
|
|
/* Step One: Determine Who To Connect To */
|
|
status = ap_proxy_determine_connection(p, r, conf, worker, backend,
|
|
uri, &url, proxyname, proxyport,
|
|
server_portstr,
|
|
sizeof(server_portstr));
|
|
|
|
if (status != OK)
|
|
goto cleanup;
|
|
|
|
/* Step Two: Make the Connection */
|
|
if (ap_proxy_connect_backend(scheme, backend, worker, r->server)) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
|
|
"proxy: AJP: failed to make connection to backend: %s",
|
|
backend->hostname);
|
|
status = HTTP_SERVICE_UNAVAILABLE;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Handle CPING/CPONG */
|
|
if (worker->ping_timeout_set) {
|
|
status = ajp_handle_cping_cpong(backend->sock, r,
|
|
worker->ping_timeout);
|
|
if (status != APR_SUCCESS) {
|
|
backend->close++;
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
|
|
"proxy: AJP: cping/cpong failed to %pI (%s)",
|
|
worker->cp->addr,
|
|
worker->hostname);
|
|
status = HTTP_SERVICE_UNAVAILABLE;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
/* Step Three: Process the Request */
|
|
status = ap_proxy_ajp_request(p, r, backend, origin, dconf, uri, url,
|
|
server_portstr);
|
|
|
|
cleanup:
|
|
/* Do not close the socket */
|
|
ap_proxy_release_connection(scheme, backend, r->server);
|
|
return status;
|
|
}
|
|
|
|
static void ap_proxy_http_register_hook(apr_pool_t *p)
|
|
{
|
|
proxy_hook_scheme_handler(proxy_ajp_handler, NULL, NULL, APR_HOOK_FIRST);
|
|
proxy_hook_canon_handler(proxy_ajp_canon, NULL, NULL, APR_HOOK_FIRST);
|
|
}
|
|
|
|
module AP_MODULE_DECLARE_DATA proxy_ajp_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 */
|
|
};
|
|
|