| /* 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 (ap_cstr_casecmpn(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 && !ap_parse_strict_length(&len, clp)) { |
| len = -1; /* 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; |
| const char *secret = NULL; |
| |
| 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); |
| |
| if (*conn->worker->s->secret) |
| secret = conn->worker->s->secret; |
| |
| /* |
| * Send the AJP request to the remote server |
| */ |
| |
| /* send request headers */ |
| status = ajp_send_header(conn->sock, r, maxsize, uri, secret); |
| 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 { |
| /* |
| * 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 block of data */ |
| input_brigade = apr_brigade_create(p, r->connection->bucket_alloc); |
| tenc = apr_table_get(r->headers_in, "Transfer-Encoding"); |
| if (tenc && (ap_cstr_casecmp(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); |
| if (content_length < 0) { |
| status = APR_EINVAL; |
| } |
| else { |
| 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) { |
| apr_table_setn(r->notes, "proxy_timedout", "1"); |
| 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 (!ap_proxy_should_override(conf, 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 (ap_proxy_should_override(conf, 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 (!ap_proxy_should_override(conf, 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 (ap_proxy_should_override(conf, 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 { |
| /* 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) { |
| apr_table_setn(r->notes, "proxy_timedout", "1"); |
| rv = HTTP_GATEWAY_TIME_OUT; |
| } |
| 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 (ap_cstr_casecmpn(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); |
| APR_REGISTER_OPTIONAL_FN(ajp_handle_cping_cpong); |
| } |
| |
| 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 */ |
| }; |
| |
