| /* Copyright 1999-2004 The Apache Software Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "apr_strings.h" |
| #include "apr_thread_proc.h" /* for RLIMIT stuff */ |
| |
| #define APR_WANT_STRFUNC |
| #include "apr_want.h" |
| |
| #define CORE_PRIVATE |
| #include "httpd.h" |
| #include "http_config.h" |
| #include "http_connection.h" |
| #include "http_core.h" |
| #include "http_protocol.h" /* For index_of_response(). Grump. */ |
| #include "http_request.h" |
| |
| #include "util_filter.h" |
| #include "util_ebcdic.h" |
| #include "ap_mpm.h" |
| #include "scoreboard.h" |
| |
| #include "mod_core.h" |
| |
| /* Handles for core filters */ |
| AP_DECLARE_DATA ap_filter_rec_t *ap_http_input_filter_handle; |
| AP_DECLARE_DATA ap_filter_rec_t *ap_http_header_filter_handle; |
| AP_DECLARE_DATA ap_filter_rec_t *ap_chunk_filter_handle; |
| AP_DECLARE_DATA ap_filter_rec_t *ap_byterange_filter_handle; |
| |
| static const char *set_keep_alive_timeout(cmd_parms *cmd, void *dummy, |
| const char *arg) |
| { |
| const char *err = ap_check_cmd_context(cmd, NOT_IN_DIR_LOC_FILE|NOT_IN_LIMIT); |
| if (err != NULL) { |
| return err; |
| } |
| |
| cmd->server->keep_alive_timeout = apr_time_from_sec(atoi(arg)); |
| return NULL; |
| } |
| |
| static const char *set_keep_alive(cmd_parms *cmd, void *dummy, |
| const char *arg) |
| { |
| const char *err = ap_check_cmd_context(cmd, NOT_IN_DIR_LOC_FILE|NOT_IN_LIMIT); |
| if (err != NULL) { |
| return err; |
| } |
| |
| /* We've changed it to On/Off, but used to use numbers |
| * so we accept anything but "Off" or "0" as "On" |
| */ |
| if (!strcasecmp(arg, "off") || !strcmp(arg, "0")) { |
| cmd->server->keep_alive = 0; |
| } |
| else { |
| cmd->server->keep_alive = 1; |
| } |
| return NULL; |
| } |
| |
| static const char *set_keep_alive_max(cmd_parms *cmd, void *dummy, |
| const char *arg) |
| { |
| const char *err = ap_check_cmd_context(cmd, NOT_IN_DIR_LOC_FILE|NOT_IN_LIMIT); |
| if (err != NULL) { |
| return err; |
| } |
| |
| cmd->server->keep_alive_max = atoi(arg); |
| return NULL; |
| } |
| |
| static const command_rec http_cmds[] = { |
| AP_INIT_TAKE1("KeepAliveTimeout", set_keep_alive_timeout, NULL, RSRC_CONF, |
| "Keep-Alive timeout duration (sec)"), |
| AP_INIT_TAKE1("MaxKeepAliveRequests", set_keep_alive_max, NULL, RSRC_CONF, |
| "Maximum number of Keep-Alive requests per connection, or 0 for infinite"), |
| AP_INIT_TAKE1("KeepAlive", set_keep_alive, NULL, RSRC_CONF, |
| "Whether persistent connections should be On or Off"), |
| { NULL } |
| }; |
| |
| /* |
| * HTTP/1.1 chunked transfer encoding filter. |
| */ |
| static apr_status_t chunk_filter(ap_filter_t *f, apr_bucket_brigade *b) |
| { |
| #define ASCII_CRLF "\015\012" |
| #define ASCII_ZERO "\060" |
| conn_rec *c = f->r->connection; |
| apr_bucket_brigade *more; |
| apr_bucket *e; |
| apr_status_t rv; |
| |
| for (more = NULL; b; b = more, more = NULL) { |
| apr_off_t bytes = 0; |
| apr_bucket *eos = NULL; |
| apr_bucket *flush = NULL; |
| /* XXX: chunk_hdr must remain at this scope since it is used in a |
| * transient bucket. |
| */ |
| char chunk_hdr[20]; /* enough space for the snprintf below */ |
| |
| |
| for (e = APR_BRIGADE_FIRST(b); |
| e != APR_BRIGADE_SENTINEL(b); |
| e = APR_BUCKET_NEXT(e)) |
| { |
| if (APR_BUCKET_IS_EOS(e)) { |
| /* there shouldn't be anything after the eos */ |
| eos = e; |
| break; |
| } |
| if (APR_BUCKET_IS_FLUSH(e)) { |
| flush = e; |
| } |
| else if (e->length == (apr_size_t)-1) { |
| /* unknown amount of data (e.g. a pipe) */ |
| const char *data; |
| apr_size_t len; |
| |
| rv = apr_bucket_read(e, &data, &len, APR_BLOCK_READ); |
| if (rv != APR_SUCCESS) { |
| return rv; |
| } |
| if (len > 0) { |
| /* |
| * There may be a new next bucket representing the |
| * rest of the data stream on which a read() may |
| * block so we pass down what we have so far. |
| */ |
| bytes += len; |
| more = apr_brigade_split(b, APR_BUCKET_NEXT(e)); |
| break; |
| } |
| else { |
| /* If there was nothing in this bucket then we can |
| * safely move on to the next one without pausing |
| * to pass down what we have counted up so far. |
| */ |
| continue; |
| } |
| } |
| else { |
| bytes += e->length; |
| } |
| } |
| |
| /* |
| * XXX: if there aren't very many bytes at this point it may |
| * be a good idea to set them aside and return for more, |
| * unless we haven't finished counting this brigade yet. |
| */ |
| /* if there are content bytes, then wrap them in a chunk */ |
| if (bytes > 0) { |
| apr_size_t hdr_len; |
| /* |
| * Insert the chunk header, specifying the number of bytes in |
| * the chunk. |
| */ |
| hdr_len = apr_snprintf(chunk_hdr, sizeof(chunk_hdr), |
| "%" APR_UINT64_T_HEX_FMT CRLF, (apr_uint64_t)bytes); |
| ap_xlate_proto_to_ascii(chunk_hdr, hdr_len); |
| e = apr_bucket_transient_create(chunk_hdr, hdr_len, |
| c->bucket_alloc); |
| APR_BRIGADE_INSERT_HEAD(b, e); |
| |
| /* |
| * Insert the end-of-chunk CRLF before an EOS or |
| * FLUSH bucket, or appended to the brigade |
| */ |
| e = apr_bucket_immortal_create(ASCII_CRLF, 2, c->bucket_alloc); |
| if (eos != NULL) { |
| APR_BUCKET_INSERT_BEFORE(eos, e); |
| } |
| else if (flush != NULL) { |
| APR_BUCKET_INSERT_BEFORE(flush, e); |
| } |
| else { |
| APR_BRIGADE_INSERT_TAIL(b, e); |
| } |
| } |
| |
| /* RFC 2616, Section 3.6.1 |
| * |
| * If there is an EOS bucket, then prefix it with: |
| * 1) the last-chunk marker ("0" CRLF) |
| * 2) the trailer |
| * 3) the end-of-chunked body CRLF |
| * |
| * If there is no EOS bucket, then do nothing. |
| * |
| * XXX: it would be nice to combine this with the end-of-chunk |
| * marker above, but this is a bit more straight-forward for |
| * now. |
| */ |
| if (eos != NULL) { |
| /* XXX: (2) trailers ... does not yet exist */ |
| e = apr_bucket_immortal_create(ASCII_ZERO ASCII_CRLF |
| /* <trailers> */ |
| ASCII_CRLF, 5, c->bucket_alloc); |
| APR_BUCKET_INSERT_BEFORE(eos, e); |
| } |
| |
| /* pass the brigade to the next filter. */ |
| rv = ap_pass_brigade(f->next, b); |
| if (rv != APR_SUCCESS || eos != NULL) { |
| return rv; |
| } |
| } |
| return APR_SUCCESS; |
| } |
| |
| static const char *http_method(const request_rec *r) |
| { return "http"; } |
| |
| static apr_port_t http_port(const request_rec *r) |
| { return DEFAULT_HTTP_PORT; } |
| |
| static int ap_process_http_connection(conn_rec *c) |
| { |
| request_rec *r; |
| int csd_set = 0; |
| apr_socket_t *csd = NULL; |
| |
| /* |
| * Read and process each request found on our connection |
| * until no requests are left or we decide to close. |
| */ |
| |
| ap_update_child_status(c->sbh, SERVER_BUSY_READ, NULL); |
| while ((r = ap_read_request(c)) != NULL) { |
| |
| c->keepalive = AP_CONN_UNKNOWN; |
| /* process the request if it was read without error */ |
| |
| ap_update_child_status(c->sbh, SERVER_BUSY_WRITE, r); |
| if (r->status == HTTP_OK) |
| ap_process_request(r); |
| |
| if (ap_extended_status) |
| ap_increment_counts(c->sbh, r); |
| |
| if (c->keepalive != AP_CONN_KEEPALIVE || c->aborted) |
| break; |
| |
| ap_update_child_status(c->sbh, SERVER_BUSY_KEEPALIVE, r); |
| apr_pool_destroy(r->pool); |
| |
| if (ap_graceful_stop_signalled()) |
| break; |
| /* Go straight to select() to wait for the next request */ |
| if (!csd_set) { |
| csd = ap_get_module_config(c->conn_config, &core_module); |
| csd_set = 1; |
| } |
| apr_socket_opt_set(csd, APR_INCOMPLETE_READ, 1); |
| } |
| |
| return OK; |
| } |
| |
| static int http_create_request(request_rec *r) |
| { |
| if (!r->main && !r->prev) { |
| ap_add_output_filter_handle(ap_byterange_filter_handle, |
| NULL, r, r->connection); |
| ap_add_output_filter_handle(ap_content_length_filter_handle, |
| NULL, r, r->connection); |
| ap_add_output_filter_handle(ap_http_header_filter_handle, |
| NULL, r, r->connection); |
| } |
| |
| return OK; |
| } |
| |
| static void register_hooks(apr_pool_t *p) |
| { |
| ap_hook_process_connection(ap_process_http_connection,NULL,NULL, |
| APR_HOOK_REALLY_LAST); |
| ap_hook_map_to_storage(ap_send_http_trace,NULL,NULL,APR_HOOK_MIDDLE); |
| ap_hook_http_method(http_method,NULL,NULL,APR_HOOK_REALLY_LAST); |
| ap_hook_default_port(http_port,NULL,NULL,APR_HOOK_REALLY_LAST); |
| ap_hook_create_request(http_create_request, NULL, NULL, APR_HOOK_REALLY_LAST); |
| ap_http_input_filter_handle = |
| ap_register_input_filter("HTTP_IN", ap_http_filter, |
| NULL, AP_FTYPE_PROTOCOL); |
| ap_http_header_filter_handle = |
| ap_register_output_filter("HTTP_HEADER", ap_http_header_filter, |
| NULL, AP_FTYPE_PROTOCOL); |
| ap_chunk_filter_handle = |
| ap_register_output_filter("CHUNK", chunk_filter, |
| NULL, AP_FTYPE_TRANSCODE); |
| ap_byterange_filter_handle = |
| ap_register_output_filter("BYTERANGE", ap_byterange_filter, |
| NULL, AP_FTYPE_PROTOCOL); |
| ap_method_registry_init(p); |
| } |
| |
| module AP_MODULE_DECLARE_DATA http_module = { |
| STANDARD20_MODULE_STUFF, |
| NULL, /* create per-directory config structure */ |
| NULL, /* merge per-directory config structures */ |
| NULL, /* create per-server config structure */ |
| NULL, /* merge per-server config structures */ |
| http_cmds, /* command apr_table_t */ |
| register_hooks /* register hooks */ |
| }; |
