diff options
Diffstat (limited to 'modules/proxy/mod_proxy_ajp.c')
| -rw-r--r-- | modules/proxy/mod_proxy_ajp.c | 830 |
1 files changed, 830 insertions, 0 deletions
diff --git a/modules/proxy/mod_proxy_ajp.c b/modules/proxy/mod_proxy_ajp.c new file mode 100644 index 0000000..73716af --- /dev/null +++ b/modules/proxy/mod_proxy_ajp.c @@ -0,0 +1,830 @@ +/* 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. + */ + +/* AJP routines for Apache proxy */ + +#include "mod_proxy.h" +#include "ajp.h" + +module AP_MODULE_DECLARE_DATA proxy_ajp_module; + +/* + * 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_ajp_canon(request_rec *r, char *url) +{ + char *host, *path, sport[7]; + char *search = NULL; + const char *err; + apr_port_t port, def_port; + + /* ap_port_of_scheme() */ + if (strncasecmp(url, "ajp:", 4) == 0) { + url += 4; + } + else { + return DECLINED; + } + + ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, "canonicalising URL %s", url); + + /* + * do syntactic check. + * We break the URL into host, port, path, search + */ + port = def_port = ap_proxy_port_of_scheme("ajp"); + + err = ap_proxy_canon_netloc(r->pool, &url, NULL, NULL, &host, &port); + if (err) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00867) "error parsing URL %s: %s", + url, err); + return HTTP_BAD_REQUEST; + } + + /* + * now parse path/search args, according to rfc1738: + * process the path. With proxy-nocanon set (by + * mod_proxy) we use the raw, unparsed uri + */ + 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; + } + 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:ajp://", host, sport, + "/", path, (search) ? "?" : "", + (search) ? search : "", NULL); + return OK; +} + +#define METHOD_NON_IDEMPOTENT 0 +#define METHOD_IDEMPOTENT 1 +#define METHOD_IDEMPOTENT_WITH_ARGS 2 + +static int is_idempotent(request_rec *r) +{ + /* + * RFC2616 (9.1.2): GET, HEAD, PUT, DELETE, OPTIONS, TRACE are considered + * idempotent. Hint: HEAD requests use M_GET as method number as well. + */ + switch (r->method_number) { + case M_GET: + case M_DELETE: + case M_PUT: + case M_OPTIONS: + case M_TRACE: + /* + * If the request has arguments it might have side-effects and thus + * it might be undesirable to resend it to a backend again + * automatically. + */ + if (r->args) { + return METHOD_IDEMPOTENT_WITH_ARGS; + } + return METHOD_IDEMPOTENT; + /* Everything else is not considered idempotent. */ + default: + return METHOD_NON_IDEMPOTENT; + } +} + +static apr_off_t get_content_length(request_rec * r) +{ + apr_off_t len = 0; + + if (r->main == NULL) { + const char *clp = apr_table_get(r->headers_in, "Content-Length"); + + if (clp) { + char *errp; + if (apr_strtoff(&len, clp, &errp, 10) || *errp || len < 0) { + len = 0; /* parse error */ + } + } + } + + return len; +} + +/* + * XXX: AJP Auto Flushing + * + * When processing CMD_AJP13_SEND_BODY_CHUNK AJP messages we will do a poll + * with FLUSH_WAIT milliseconds timeout to determine if more data is currently + * available at the backend. If there is no more data available, we flush + * the data to the client by adding a flush bucket to the brigade we pass + * up the filter chain. + * This is only a bandaid to fix the AJP/1.3 protocol shortcoming of not + * sending (actually not having defined) a flush message, when the data + * should be flushed to the client. As soon as this protocol shortcoming is + * fixed this code should be removed. + * + * For further discussion see PR37100. + * http://issues.apache.org/bugzilla/show_bug.cgi?id=37100 + */ + +/* + * process the request and write the response. + */ +static int ap_proxy_ajp_request(apr_pool_t *p, request_rec *r, + proxy_conn_rec *conn, + conn_rec *origin, + proxy_dir_conf *conf, + apr_uri_t *uri, + char *url, char *server_portstr) +{ + apr_status_t status; + int result; + apr_bucket *e; + apr_bucket_brigade *input_brigade; + apr_bucket_brigade *output_brigade; + ajp_msg_t *msg; + apr_size_t bufsiz = 0; + char *buff; + char *send_body_chunk_buff; + apr_uint16_t size; + apr_byte_t conn_reuse = 0; + const char *tenc; + int havebody = 1; + int client_failed = 0; + int backend_failed = 0; + apr_off_t bb_len; + int data_sent = 0; + int request_ended = 0; + int headers_sent = 0; + int rv = OK; + apr_int32_t conn_poll_fd; + apr_pollfd_t *conn_poll; + proxy_server_conf *psf = + ap_get_module_config(r->server->module_config, &proxy_module); + apr_size_t maxsize = AJP_MSG_BUFFER_SZ; + int send_body = 0; + apr_off_t content_length = 0; + int original_status = r->status; + const char *original_status_line = r->status_line; + + if (psf->io_buffer_size_set) + maxsize = psf->io_buffer_size; + if (maxsize > AJP_MAX_BUFFER_SZ) + maxsize = AJP_MAX_BUFFER_SZ; + else if (maxsize < AJP_MSG_BUFFER_SZ) + maxsize = AJP_MSG_BUFFER_SZ; + maxsize = APR_ALIGN(maxsize, 1024); + + /* + * Send the AJP request to the remote server + */ + + /* send request headers */ + status = ajp_send_header(conn->sock, r, maxsize, uri); + if (status != APR_SUCCESS) { + conn->close = 1; + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(00868) + "request failed to %pI (%s)", + conn->worker->cp->addr, + conn->worker->s->hostname_ex); + if (status == AJP_EOVERFLOW) + return HTTP_BAD_REQUEST; + else if (status == AJP_EBAD_METHOD) { + return HTTP_NOT_IMPLEMENTED; + } else { + /* + * This is only non fatal when the method is idempotent. In this + * case we can dare to retry it with a different worker if we are + * a balancer member. + */ + if (is_idempotent(r) == METHOD_IDEMPOTENT) { + return HTTP_SERVICE_UNAVAILABLE; + } + return HTTP_INTERNAL_SERVER_ERROR; + } + } + + /* allocate an AJP message to store the data of the buckets */ + bufsiz = maxsize; + status = ajp_alloc_data_msg(r->pool, &buff, &bufsiz, &msg); + if (status != APR_SUCCESS) { + /* We had a failure: Close connection to backend */ + conn->close = 1; + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00869) + "ajp_alloc_data_msg failed"); + return HTTP_INTERNAL_SERVER_ERROR; + } + + /* read the first bloc of data */ + input_brigade = apr_brigade_create(p, r->connection->bucket_alloc); + tenc = apr_table_get(r->headers_in, "Transfer-Encoding"); + if (tenc && (strcasecmp(tenc, "chunked") == 0)) { + /* The AJP protocol does not want body data yet */ + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00870) "request is chunked"); + } else { + /* Get client provided Content-Length header */ + content_length = get_content_length(r); + status = ap_get_brigade(r->input_filters, input_brigade, + AP_MODE_READBYTES, APR_BLOCK_READ, + maxsize - AJP_HEADER_SZ); + + if (status != APR_SUCCESS) { + /* We had a failure: Close connection to backend */ + conn->close = 1; + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, status, r, APLOGNO(00871) + "ap_get_brigade failed"); + apr_brigade_destroy(input_brigade); + return ap_map_http_request_error(status, HTTP_BAD_REQUEST); + } + + /* have something */ + if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00872) "APR_BUCKET_IS_EOS"); + } + + /* Try to send something */ + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00873) + "data to read (max %" APR_SIZE_T_FMT + " at %" APR_SIZE_T_FMT ")", bufsiz, msg->pos); + + status = apr_brigade_flatten(input_brigade, buff, &bufsiz); + if (status != APR_SUCCESS) { + /* We had a failure: Close connection to backend */ + conn->close = 1; + apr_brigade_destroy(input_brigade); + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(00874) + "apr_brigade_flatten"); + return HTTP_INTERNAL_SERVER_ERROR; + } + apr_brigade_cleanup(input_brigade); + + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00875) + "got %" APR_SIZE_T_FMT " bytes of data", bufsiz); + if (bufsiz > 0) { + status = ajp_send_data_msg(conn->sock, msg, bufsiz); + ajp_msg_log(r, msg, "First ajp_send_data_msg: ajp_ilink_send packet dump"); + if (status != APR_SUCCESS) { + /* We had a failure: Close connection to backend */ + conn->close = 1; + apr_brigade_destroy(input_brigade); + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(00876) + "send failed to %pI (%s)", + conn->worker->cp->addr, + conn->worker->s->hostname_ex); + /* + * It is fatal when we failed to send a (part) of the request + * body. + */ + return HTTP_INTERNAL_SERVER_ERROR; + } + conn->worker->s->transferred += bufsiz; + send_body = 1; + } + else if (content_length > 0) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(00877) + "read zero bytes, expecting" + " %" APR_OFF_T_FMT " bytes", + content_length); + /* + * We can only get here if the client closed the connection + * to us without sending the body. + * Now the connection is in the wrong state on the backend. + * Sending an empty data msg doesn't help either as it does + * not move this connection to the correct state on the backend + * for later resusage by the next request again. + * Close it to clean things up. + */ + conn->close = 1; + apr_brigade_destroy(input_brigade); + return HTTP_BAD_REQUEST; + } + } + + /* read the response */ + conn->data = NULL; + status = ajp_read_header(conn->sock, r, maxsize, + (ajp_msg_t **)&(conn->data)); + if (status != APR_SUCCESS) { + /* We had a failure: Close connection to backend */ + conn->close = 1; + apr_brigade_destroy(input_brigade); + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(00878) + "read response failed from %pI (%s)", + conn->worker->cp->addr, + conn->worker->s->hostname_ex); + + /* If we had a successful cping/cpong and then a timeout + * we assume it is a request that cause a back-end timeout, + * but doesn't affect the whole worker. + */ + if (APR_STATUS_IS_TIMEUP(status) && conn->worker->s->ping_timeout_set) { + return HTTP_GATEWAY_TIME_OUT; + } + + /* + * This is only non fatal when we have not sent (parts) of a possible + * request body so far (we do not store it and thus cannot send it + * again) and the method is idempotent. In this case we can dare to + * retry it with a different worker if we are a balancer member. + */ + if (!send_body && (is_idempotent(r) == METHOD_IDEMPOTENT)) { + return HTTP_SERVICE_UNAVAILABLE; + } + return HTTP_INTERNAL_SERVER_ERROR; + } + /* parse the response */ + result = ajp_parse_type(r, conn->data); + output_brigade = apr_brigade_create(p, r->connection->bucket_alloc); + + /* + * Prepare apr_pollfd_t struct for possible later check if there is currently + * data available from the backend (do not flush response to client) + * or not (flush response to client) + */ + conn_poll = apr_pcalloc(p, sizeof(apr_pollfd_t)); + conn_poll->reqevents = APR_POLLIN; + conn_poll->desc_type = APR_POLL_SOCKET; + conn_poll->desc.s = conn->sock; + + bufsiz = maxsize; + for (;;) { + switch (result) { + case CMD_AJP13_GET_BODY_CHUNK: + if (havebody) { + if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) { + /* This is the end */ + bufsiz = 0; + havebody = 0; + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, status, r, APLOGNO(00879) + "APR_BUCKET_IS_EOS"); + } else { + status = ap_get_brigade(r->input_filters, input_brigade, + AP_MODE_READBYTES, + APR_BLOCK_READ, + maxsize - AJP_HEADER_SZ); + if (status != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, status, r, APLOGNO(00880) + "ap_get_brigade failed"); + if (APR_STATUS_IS_TIMEUP(status)) { + rv = HTTP_REQUEST_TIME_OUT; + } + else if (status == AP_FILTER_ERROR) { + rv = AP_FILTER_ERROR; + } + client_failed = 1; + break; + } + bufsiz = maxsize; + status = apr_brigade_flatten(input_brigade, buff, + &bufsiz); + apr_brigade_cleanup(input_brigade); + if (status != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, status, r, APLOGNO(00881) + "apr_brigade_flatten failed"); + rv = HTTP_INTERNAL_SERVER_ERROR; + client_failed = 1; + break; + } + } + + ajp_msg_reset(msg); + /* will go in ajp_send_data_msg */ + status = ajp_send_data_msg(conn->sock, msg, bufsiz); + ajp_msg_log(r, msg, "ajp_send_data_msg after CMD_AJP13_GET_BODY_CHUNK: ajp_ilink_send packet dump"); + if (status != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, status, r, APLOGNO(00882) + "ajp_send_data_msg failed"); + backend_failed = 1; + break; + } + conn->worker->s->transferred += bufsiz; + } else { + /* + * something is wrong TC asks for more body but we are + * already at the end of the body data + */ + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00883) + "ap_proxy_ajp_request error read after end"); + backend_failed = 1; + } + break; + case CMD_AJP13_SEND_HEADERS: + if (headers_sent) { + /* Do not send anything to the client. + * Backend already send us the headers. + */ + backend_failed = 1; + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00884) + "Backend sent headers twice."); + break; + } + /* AJP13_SEND_HEADERS: process them */ + status = ajp_parse_header(r, conf, conn->data); + if (status != APR_SUCCESS) { + backend_failed = 1; + } + else 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_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00885) + "ap_proxy_ajp_request: origin server " + "sent 401 without WWW-Authenticate header"); + } + } + headers_sent = 1; + break; + case CMD_AJP13_SEND_BODY_CHUNK: + /* AJP13_SEND_BODY_CHUNK: piece of data */ + status = ajp_parse_data(r, conn->data, &size, &send_body_chunk_buff); + if (status == APR_SUCCESS) { + /* 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)) { + /* AJP13_SEND_BODY_CHUNK with zero length + * is explicit flush message + */ + if (size == 0) { + if (headers_sent) { + e = apr_bucket_flush_create(r->connection->bucket_alloc); + APR_BRIGADE_INSERT_TAIL(output_brigade, e); + } + else { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00886) + "Ignoring flush message " + "received before headers"); + } + } + else { + apr_status_t rv; + + /* Handle the case where the error document is itself reverse + * proxied and was successful. We must maintain any previous + * error status so that an underlying error (eg HTTP_NOT_FOUND) + * doesn't become an HTTP_OK. + */ + if (conf->error_override && !ap_is_HTTP_ERROR(r->status) + && ap_is_HTTP_ERROR(original_status)) { + r->status = original_status; + r->status_line = original_status_line; + } + + e = apr_bucket_transient_create(send_body_chunk_buff, size, + r->connection->bucket_alloc); + APR_BRIGADE_INSERT_TAIL(output_brigade, e); + + if ((conn->worker->s->flush_packets == flush_on) || + ((conn->worker->s->flush_packets == flush_auto) && + ((rv = apr_poll(conn_poll, 1, &conn_poll_fd, + conn->worker->s->flush_wait)) + != APR_SUCCESS) && + APR_STATUS_IS_TIMEUP(rv))) { + e = apr_bucket_flush_create(r->connection->bucket_alloc); + APR_BRIGADE_INSERT_TAIL(output_brigade, e); + } + apr_brigade_length(output_brigade, 0, &bb_len); + if (bb_len != -1) + conn->worker->s->read += bb_len; + } + if (headers_sent) { + if (ap_pass_brigade(r->output_filters, + output_brigade) != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00887) + "error processing body.%s", + r->connection->aborted ? + " Client aborted connection." : ""); + client_failed = 1; + } + data_sent = 1; + apr_brigade_cleanup(output_brigade); + } + } + } + else { + backend_failed = 1; + } + break; + case CMD_AJP13_END_RESPONSE: + /* If we are overriding the errors, we must not send anything to + * the client, especially as the brigade already contains headers. + * So do nothing here, and it will be cleaned up below. + */ + status = ajp_parse_reuse(r, conn->data, &conn_reuse); + if (status != APR_SUCCESS) { + backend_failed = 1; + } + if (!conf->error_override || !ap_is_HTTP_ERROR(r->status)) { + e = apr_bucket_eos_create(r->connection->bucket_alloc); + APR_BRIGADE_INSERT_TAIL(output_brigade, e); + if (ap_pass_brigade(r->output_filters, + output_brigade) != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00888) + "error processing end"); + client_failed = 1; + } + /* XXX: what about flush here? See mod_jk */ + data_sent = 1; + } + request_ended = 1; + break; + default: + backend_failed = 1; + break; + } + + /* + * If connection has been aborted by client: Stop working. + * Pretend we are done (data_sent) to avoid further processing. + */ + if (r->connection->aborted) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02821) + "client connection aborted"); + /* no response yet (or ever), set status for access log */ + if (!headers_sent) { + r->status = HTTP_BAD_REQUEST; + } + client_failed = 1; + /* return DONE */ + data_sent = 1; + break; + } + + /* + * We either have finished successfully or we failed. + * So bail out + */ + if ((result == CMD_AJP13_END_RESPONSE) + || backend_failed || client_failed) + break; + + /* read the response */ + status = ajp_read_header(conn->sock, r, maxsize, + (ajp_msg_t **)&(conn->data)); + if (status != APR_SUCCESS) { + backend_failed = 1; + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, status, r, APLOGNO(00889) + "ajp_read_header failed"); + break; + } + result = ajp_parse_type(r, conn->data); + } + apr_brigade_destroy(input_brigade); + + /* + * Clear output_brigade to remove possible buckets that remained there + * after an error. + */ + apr_brigade_cleanup(output_brigade); + + if (backend_failed || client_failed) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00890) + "Processing of request failed backend: %i, client: %i", + backend_failed, client_failed); + /* We had a failure: Close connection to backend */ + conn->close = 1; + if (data_sent) { + /* Return DONE to avoid error messages being added to the stream */ + rv = DONE; + } + } + else if (!request_ended) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00891) + "Processing of request didn't terminate cleanly"); + /* We had a failure: Close connection to backend */ + conn->close = 1; + backend_failed = 1; + if (data_sent) { + /* Return DONE to avoid error messages being added to the stream */ + rv = DONE; + } + } + else if (!conn_reuse) { + /* Our backend signalled connection close */ + conn->close = 1; + } + else { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00892) + "got response from %pI (%s)", + conn->worker->cp->addr, + conn->worker->s->hostname_ex); + + if (conf->error_override && ap_is_HTTP_ERROR(r->status)) { + /* clear r->status for override error, otherwise ErrorDocument + * thinks that this is a recursive error, and doesn't find the + * custom error page + */ + rv = r->status; + r->status = HTTP_OK; + /* + * prevent proxy_handler() from treating this as an + * internal error. + */ + apr_table_setn(r->notes, "proxy-error-override", "1"); + } + else { + rv = OK; + } + } + + if (backend_failed) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(00893) + "dialog to %pI (%s) failed", + conn->worker->cp->addr, + conn->worker->s->hostname_ex); + /* + * If we already send data, signal a broken backend connection + * upwards in the chain. + */ + if (data_sent) { + ap_proxy_backend_broke(r, output_brigade); + } else if (!send_body && (is_idempotent(r) == METHOD_IDEMPOTENT)) { + /* + * This is only non fatal when we have not send (parts) of a possible + * request body so far (we do not store it and thus cannot send it + * again) and the method is idempotent. In this case we can dare to + * retry it with a different worker if we are a balancer member. + */ + rv = HTTP_SERVICE_UNAVAILABLE; + } else { + rv = HTTP_INTERNAL_SERVER_ERROR; + } + } + else if (client_failed) { + int level = (r->connection->aborted) ? APLOG_DEBUG : APLOG_ERR; + ap_log_rerror(APLOG_MARK, level, status, r, APLOGNO(02822) + "dialog with client %pI failed", + r->connection->client_addr); + if (rv == OK) { + rv = HTTP_BAD_REQUEST; + } + } + + /* + * Ensure that we sent an EOS bucket thru the filter chain, if we already + * have sent some data. Maybe ap_proxy_backend_broke was called and added + * one to the brigade already (no longer making it empty). So we should + * not do this in this case. + */ + if (data_sent && !r->eos_sent && !r->connection->aborted + && APR_BRIGADE_EMPTY(output_brigade)) { + 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, send it */ + if (!APR_BRIGADE_EMPTY(output_brigade) + && ap_pass_brigade(r->output_filters, output_brigade) != APR_SUCCESS) { + rv = AP_FILTER_ERROR; + } + + apr_brigade_destroy(output_brigade); + + if (apr_table_get(r->subprocess_env, "proxy-nokeepalive")) { + conn->close = 1; + } + + 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"; + int retry; + proxy_dir_conf *dconf = ap_get_module_config(r->per_dir_config, + &proxy_module); + apr_pool_t *p = r->pool; + apr_uri_t *uri; + + if (strncasecmp(url, "ajp:", 4) != 0) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00894) "declining URL %s", url); + return DECLINED; + } + + uri = apr_palloc(p, sizeof(*uri)); + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00895) "serving URL %s", url); + + /* create space for state information */ + 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; + + retry = 0; + while (retry < 2) { + char *locurl = url; + /* Step One: Determine Who To Connect To */ + status = ap_proxy_determine_connection(p, r, conf, worker, backend, + uri, &locurl, proxyname, proxyport, + server_portstr, + sizeof(server_portstr)); + + if (status != OK) + break; + + /* Step Two: Make the Connection */ + if (ap_proxy_check_connection(scheme, backend, r->server, 0, + PROXY_CHECK_CONN_EMPTY) + && ap_proxy_connect_backend(scheme, backend, worker, + r->server)) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00896) + "failed to make connection to backend: %s", + backend->hostname); + status = HTTP_SERVICE_UNAVAILABLE; + break; + } + + /* Handle CPING/CPONG */ + if (worker->s->ping_timeout_set) { + status = ajp_handle_cping_cpong(backend->sock, r, + worker->s->ping_timeout); + /* + * In case the CPING / CPONG failed for the first time we might be + * just out of luck and got a faulty backend connection, but the + * backend might be healthy nevertheless. So ensure that the backend + * TCP connection gets closed and try it once again. + */ + if (status != APR_SUCCESS) { + backend->close = 1; + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(00897) + "cping/cpong failed to %pI (%s)", + worker->cp->addr, worker->s->hostname_ex); + status = HTTP_SERVICE_UNAVAILABLE; + retry++; + continue; + } + } + /* Step Three: Process the Request */ + status = ap_proxy_ajp_request(p, r, backend, origin, dconf, uri, locurl, + server_portstr); + break; + } + + /* 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); +} + +AP_DECLARE_MODULE(proxy_ajp) = { + 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 */ +}; + |