Adding upstream version 2.4.57.upstream/2.4.57upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 326 insertions, 0 deletions

diff --git a/modules/http/http_core.c b/modules/http/http_core.c
new file mode 100644
index 0000000..c6cb473
--- /dev/null
+++ b/modules/http/http_core.c
@@ -0,0 +1,326 @@
+/* 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.
+ */
+
+#include "apr_strings.h"
+#include "apr_thread_proc.h"    /* for RLIMIT stuff */
+
+#define APR_WANT_STRFUNC
+#include "apr_want.h"
+
+#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_http_outerror_filter_handle;
+AP_DECLARE_DATA ap_filter_rec_t *ap_byterange_filter_handle;
+
+AP_DECLARE_DATA const char *ap_multipart_boundary;
+
+/* If we are using an MPM That Supports Async Connections,
+ * use a different processing function
+ */
+static int async_mpm = 0;
+
+static const char *set_keep_alive_timeout(cmd_parms *cmd, void *dummy,
+                                          const char *arg)
+{
+    apr_interval_time_t timeout;
+    const char *err = ap_check_cmd_context(cmd, NOT_IN_DIR_CONTEXT);
+    if (err != NULL) {
+        return err;
+    }
+
+    /* Stolen from mod_proxy.c */
+    if (ap_timeout_parameter_parse(arg, &timeout, "s") != APR_SUCCESS)
+        return "KeepAliveTimeout has wrong format";
+    cmd->server->keep_alive_timeout = timeout;
+
+    /* We don't want to take into account whether or not KeepAliveTimeout is
+     * set for the main server, because if no http_module directive is used
+     * for a vhost, it will inherit the http_srv_cfg from the main server.
+     * However keep_alive_timeout_set helps determine whether the vhost should
+     * use its own configured timeout or the one from the vhost declared first
+     * on the same IP:port (ie. c->base_server, and the legacy behaviour).
+     */
+    if (cmd->server->is_virtual) {
+        cmd->server->keep_alive_timeout_set = 1;
+    }
+    return NULL;
+}
+
+static const char *set_keep_alive(cmd_parms *cmd, void *dummy,
+                                  int arg)
+{
+    const char *err = ap_check_cmd_context(cmd, NOT_IN_DIR_CONTEXT);
+    if (err != NULL) {
+        return err;
+    }
+
+    cmd->server->keep_alive = arg;
+    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_CONTEXT);
+    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_FLAG("KeepAlive", set_keep_alive, NULL, RSRC_CONF,
+                  "Whether persistent connections should be On or Off"),
+    { NULL }
+};
+
+static const char *http_scheme(const request_rec *r)
+{
+    /*
+     * The http module shouldn't return anything other than
+     * "http" (the default) or "https".
+     */
+    if (r->server->server_scheme &&
+        (strcmp(r->server->server_scheme, "https") == 0))
+        return "https";
+
+    return "http";
+}
+
+static apr_port_t http_port(const request_rec *r)
+{
+    if (r->server->server_scheme &&
+        (strcmp(r->server->server_scheme, "https") == 0))
+        return DEFAULT_HTTPS_PORT;
+
+    return DEFAULT_HTTP_PORT;
+}
+
+static int ap_process_http_async_connection(conn_rec *c)
+{
+    request_rec *r = NULL;
+    conn_state_t *cs = c->cs;
+
+    AP_DEBUG_ASSERT(cs != NULL);
+    AP_DEBUG_ASSERT(cs->state == CONN_STATE_READ_REQUEST_LINE);
+
+    if (cs->state == CONN_STATE_READ_REQUEST_LINE) {
+        ap_update_child_status_from_conn(c->sbh, SERVER_BUSY_READ, c);
+        if (ap_extended_status) {
+            ap_set_conn_count(c->sbh, r, c->keepalives);
+        }
+        if ((r = ap_read_request(c))) {
+            if (r->status == HTTP_OK) {
+                cs->state = CONN_STATE_HANDLER;
+                if (ap_extended_status) {
+                    ap_set_conn_count(c->sbh, r, c->keepalives + 1);
+                }
+                ap_update_child_status(c->sbh, SERVER_BUSY_WRITE, r);
+                ap_process_async_request(r);
+                /* After the call to ap_process_request, the
+                 * request pool may have been deleted.  We set
+                 * r=NULL here to ensure that any dereference
+                 * of r that might be added later in this function
+                 * will result in a segfault immediately instead
+                 * of nondeterministic failures later.
+                 */
+                r = NULL;
+            }
+
+            if (cs->state != CONN_STATE_WRITE_COMPLETION &&
+                cs->state != CONN_STATE_SUSPENDED) {
+                /* Something went wrong; close the connection */
+                cs->state = CONN_STATE_LINGER;
+            }
+        }
+        else {   /* ap_read_request failed - client may have closed */
+            cs->state = CONN_STATE_LINGER;
+        }
+    }
+
+    return OK;
+}
+
+static int ap_process_http_sync_connection(conn_rec *c)
+{
+    request_rec *r;
+    conn_state_t *cs = c->cs;
+    apr_socket_t *csd = NULL;
+    int mpm_state = 0;
+
+    /*
+     * Read and process each request found on our connection
+     * until no requests are left or we decide to close.
+     */
+
+    ap_update_child_status_from_conn(c->sbh, SERVER_BUSY_READ, c);
+    while ((r = ap_read_request(c)) != NULL) {
+        apr_interval_time_t keep_alive_timeout = r->server->keep_alive_timeout;
+
+        /* To preserve legacy behaviour, use the keepalive timeout from the
+         * base server (first on this IP:port) when none is explicitly
+         * configured on this server.
+         */
+        if (!r->server->keep_alive_timeout_set) {
+            keep_alive_timeout = c->base_server->keep_alive_timeout;
+        }
+
+        if (r->status == HTTP_OK) {
+            if (cs)
+                cs->state = CONN_STATE_HANDLER;
+            ap_update_child_status(c->sbh, SERVER_BUSY_WRITE, r);
+            ap_process_request(r);
+            /* After the call to ap_process_request, the
+             * request pool will have been deleted.  We set
+             * r=NULL here to ensure that any dereference
+             * of r that might be added later in this function
+             * will result in a segfault immediately instead
+             * of nondeterministic failures later.
+             */
+            r = NULL;
+        }
+
+        if (c->keepalive != AP_CONN_KEEPALIVE || c->aborted)
+            break;
+
+        ap_update_child_status(c->sbh, SERVER_BUSY_KEEPALIVE, NULL);
+
+        if (ap_mpm_query(AP_MPMQ_MPM_STATE, &mpm_state)) {
+            break;
+        }
+
+        if (mpm_state == AP_MPMQ_STOPPING) {
+          break;
+        }
+
+        if (!csd) {
+            csd = ap_get_conn_socket(c);
+        }
+        apr_socket_opt_set(csd, APR_INCOMPLETE_READ, 1);
+        apr_socket_timeout_set(csd, keep_alive_timeout);
+        /* Go straight to select() to wait for the next request */
+    }
+
+    return OK;
+}
+
+static int ap_process_http_connection(conn_rec *c)
+{
+    if (async_mpm && !c->clogging_input_filters) {
+        return ap_process_http_async_connection(c);
+    }
+    else {
+        return ap_process_http_sync_connection(c);
+    }
+}
+
+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);
+        ap_add_output_filter_handle(ap_http_outerror_filter_handle,
+                                    NULL, r, r->connection);
+    }
+
+    return OK;
+}
+
+static int http_send_options(request_rec *r)
+{
+    if ((r->method_number == M_OPTIONS) && r->uri && (r->uri[0] == '*') &&
+         (r->uri[1] == '\0')) {
+        return DONE;           /* Send HTTP pong, without Allow header */
+    }
+    return DECLINED;
+}
+
+static int http_post_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
+{
+    apr_uint64_t val;
+    if (ap_mpm_query(AP_MPMQ_IS_ASYNC, &async_mpm) != APR_SUCCESS) {
+        async_mpm = 0;
+    }
+    ap_random_insecure_bytes(&val, sizeof(val));
+    ap_multipart_boundary = apr_psprintf(p, "%0" APR_UINT64_T_HEX_FMT, val);
+
+    return OK;
+}
+
+static void register_hooks(apr_pool_t *p)
+{
+    ap_hook_post_config(http_post_config, NULL, NULL, APR_HOOK_MIDDLE);
+    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_map_to_storage(http_send_options,NULL,NULL,APR_HOOK_MIDDLE);
+    ap_hook_http_scheme(http_scheme,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", ap_http_chunk_filter,
+                                  NULL, AP_FTYPE_TRANSCODE);
+    ap_http_outerror_filter_handle =
+        ap_register_output_filter("HTTP_OUTERROR", ap_http_outerror_filter,
+                                  NULL, AP_FTYPE_PROTOCOL);
+    ap_byterange_filter_handle =
+        ap_register_output_filter("BYTERANGE", ap_byterange_filter,
+                                  NULL, AP_FTYPE_PROTOCOL);
+    ap_method_registry_init(p);
+}
+
+AP_DECLARE_MODULE(http) = {
+    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 */
+};