1/* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements.  See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License.  You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "apr_strings.h"
18#include "ap_config.h"
19#include "httpd.h"
20#include "http_config.h"
21#include "http_protocol.h"
22#include "http_log.h"
23#include "util_script.h"
24#include "http_main.h"
25#include "http_request.h"
26
27#include "mod_core.h"
28
29#define ASIS_MAGIC_TYPE "httpd/send-as-is"
30
31static int asis_handler(request_rec *r)
32{
33    apr_file_t *f;
34    apr_status_t rv;
35    const char *location;
36
37    if (strcmp(r->handler, ASIS_MAGIC_TYPE) && strcmp(r->handler, "send-as-is")) {
38        return DECLINED;
39    }
40
41    r->allowed |= (AP_METHOD_BIT << M_GET);
42    if (r->method_number != M_GET) {
43        return DECLINED;
44    }
45
46    if (r->finfo.filetype == APR_NOFILE) {
47        ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(01233)
48                    "File does not exist: %s", r->filename);
49        return HTTP_NOT_FOUND;
50    }
51
52    if ((rv = apr_file_open(&f, r->filename, APR_READ,
53                APR_OS_DEFAULT, r->pool)) != APR_SUCCESS) {
54        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01234)
55                    "file permissions deny server access: %s", r->filename);
56        return HTTP_FORBIDDEN;
57    }
58
59    ap_scan_script_header_err_ex(r, f, NULL, APLOG_MODULE_INDEX);
60    location = apr_table_get(r->headers_out, "Location");
61
62    if (location && location[0] == '/' &&
63        ((r->status == HTTP_OK) || ap_is_HTTP_REDIRECT(r->status))) {
64
65        apr_file_close(f);
66
67        /* Internal redirect -- fake-up a pseudo-request */
68        r->status = HTTP_OK;
69
70        /* This redirect needs to be a GET no matter what the original
71         * method was.
72         */
73        r->method = "GET";
74        r->method_number = M_GET;
75
76        ap_internal_redirect_handler(location, r);
77        return OK;
78    }
79
80    if (!r->header_only) {
81        conn_rec *c = r->connection;
82        apr_bucket_brigade *bb;
83        apr_bucket *b;
84        apr_off_t pos = 0;
85
86        rv = apr_file_seek(f, APR_CUR, &pos);
87        if (rv != APR_SUCCESS) {
88            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01235)
89                          "mod_asis: failed to find end-of-headers position "
90                          "for %s", r->filename);
91            apr_file_close(f);
92            return HTTP_INTERNAL_SERVER_ERROR;
93        }
94
95        bb = apr_brigade_create(r->pool, c->bucket_alloc);
96        apr_brigade_insert_file(bb, f, pos, r->finfo.size - pos, r->pool);
97
98        b = apr_bucket_eos_create(c->bucket_alloc);
99        APR_BRIGADE_INSERT_TAIL(bb, b);
100        rv = ap_pass_brigade(r->output_filters, bb);
101        if (rv != APR_SUCCESS) {
102            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01236)
103                          "mod_asis: ap_pass_brigade failed for file %s", r->filename);
104            return HTTP_INTERNAL_SERVER_ERROR;
105        }
106    }
107    else {
108        apr_file_close(f);
109    }
110
111    return OK;
112}
113
114static void register_hooks(apr_pool_t *p)
115{
116    ap_hook_handler(asis_handler,NULL,NULL,APR_HOOK_MIDDLE);
117}
118
119AP_DECLARE_MODULE(asis) =
120{
121    STANDARD20_MODULE_STUFF,
122    NULL,              /* create per-directory config structure */
123    NULL,              /* merge per-directory config structures */
124    NULL,              /* create per-server config structure */
125    NULL,              /* merge per-server config structures */
126    NULL,              /* command apr_table_t */
127    register_hooks     /* register hooks */
128};
129