1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
/* 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_tables.h"
#include "httpd.h"
#include "http_config.h"
#include "http_core.h"
#include "http_log.h"
#include "http_protocol.h"
#include "http_request.h"
#include "mod_core.h"
module AP_MODULE_DECLARE_DATA reflector_module;
typedef struct {
apr_table_t *headers;
} reflector_cfg;
static int header_do(void *dummy, const char *key, const char *value)
{
request_rec *r = (request_rec *) dummy;
const char *payload;
payload = apr_table_get(r->headers_in, key);
if (payload) {
apr_table_setn(r->headers_out, value, payload);
}
return 1;
}
static int reflector_handler(request_rec * r)
{
apr_bucket_brigade *bbin, *bbout;
reflector_cfg *conf;
apr_status_t status;
if (strcmp(r->handler, "reflector")) {
return DECLINED;
}
conf = (reflector_cfg *) ap_get_module_config(r->per_dir_config,
&reflector_module);
ap_allow_methods(r, 1, "POST", "OPTIONS", NULL);
if (r->method_number == M_OPTIONS) {
return ap_send_http_options(r);
}
else if (r->method_number == M_POST) {
const char *content_length, *content_type;
int seen_eos;
/*
* Sometimes we'll get in a state where the input handling has
* detected an error where we want to drop the connection, so if
* that's the case, don't read the data as that is what we're trying
* to avoid.
*
* This function is also a no-op on a subrequest.
*/
if (r->main || r->connection->keepalive == AP_CONN_CLOSE ||
ap_status_drops_connection(r->status)) {
return OK;
}
/* copy headers from in to out if configured */
apr_table_do(header_do, r, conf->headers, NULL);
/* last modified defaults to now, unless otherwise set on the way in */
if (!apr_table_get(r->headers_out, "Last-Modified")) {
ap_update_mtime(r, apr_time_now());
ap_set_last_modified(r);
}
ap_set_accept_ranges(r);
/* reflect the content length, if present */
if ((content_length = apr_table_get(r->headers_in, "Content-Length"))) {
apr_off_t clen;
if (!ap_parse_strict_length(&clen, content_length)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10243)
"reflector_handler: invalid content-length '%s'",
content_length);
return HTTP_BAD_REQUEST;
}
ap_set_content_length(r, clen);
}
/* reflect the content type, if present */
if ((content_type = apr_table_get(r->headers_in, "Content-Type"))) {
ap_set_content_type(r, content_type);
}
bbin = apr_brigade_create(r->pool, r->connection->bucket_alloc);
bbout = apr_brigade_create(r->pool, r->connection->bucket_alloc);
seen_eos = 0;
do {
apr_bucket *bucket;
status = ap_get_brigade(r->input_filters, bbin, AP_MODE_READBYTES,
APR_BLOCK_READ, HUGE_STRING_LEN);
if (status != APR_SUCCESS) {
apr_brigade_destroy(bbin);
return ap_map_http_request_error(status, HTTP_BAD_REQUEST);
}
for (bucket = APR_BRIGADE_FIRST(bbin);
bucket != APR_BRIGADE_SENTINEL(bbin);
bucket = APR_BUCKET_NEXT(bucket)) {
const char *data;
apr_size_t len;
if (APR_BUCKET_IS_EOS(bucket)) {
seen_eos = 1;
break;
}
/* These are metadata buckets. */
if (bucket->length == 0) {
continue;
}
/*
* We MUST read because in case we have an unknown-length
* bucket or one that morphs, we want to exhaust it.
*/
status = apr_bucket_read(bucket, &data, &len, APR_BLOCK_READ);
if (status != APR_SUCCESS) {
apr_brigade_destroy(bbin);
return HTTP_BAD_REQUEST;
}
apr_brigade_write(bbout, NULL, NULL, data, len);
status = ap_pass_brigade(r->output_filters, bbout);
if (status != APR_SUCCESS) {
/* no way to know what type of error occurred */
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, status, r, APLOGNO(01410)
"reflector_handler: ap_pass_brigade returned %i",
status);
return AP_FILTER_ERROR;
}
}
apr_brigade_cleanup(bbin);
} while (!seen_eos);
return OK;
}
else {
return HTTP_METHOD_NOT_ALLOWED;
}
}
static void *create_reflector_dir_config(apr_pool_t * p, char *d)
{
reflector_cfg *conf = apr_pcalloc(p, sizeof(reflector_cfg));
conf->headers = apr_table_make(p, 8);
return conf;
}
static void *merge_reflector_dir_config(apr_pool_t * p, void *basev, void *addv)
{
reflector_cfg *new = (reflector_cfg *) apr_pcalloc(p,
sizeof(reflector_cfg));
reflector_cfg *add = (reflector_cfg *) addv;
reflector_cfg *base = (reflector_cfg *) basev;
new->headers = apr_table_overlay(p, add->headers, base->headers);
return new;
}
static const char *reflector_header(cmd_parms * cmd, void *dummy, const char *in,
const char *out)
{
reflector_cfg *cfg = (reflector_cfg *) dummy;
apr_table_addn(cfg->headers, in, out ? out : in);
return NULL;
}
static void reflector_hooks(apr_pool_t * p)
{
ap_hook_handler(reflector_handler, NULL, NULL, APR_HOOK_MIDDLE);
}
static const command_rec reflector_cmds[] = {
AP_INIT_TAKE12("ReflectorHeader", reflector_header, NULL, OR_OPTIONS,
"Header to reflect back in the response, with an optional new name."),
{NULL}
};
AP_DECLARE_MODULE(reflector) = {
STANDARD20_MODULE_STUFF,
create_reflector_dir_config,
merge_reflector_dir_config,
NULL,
NULL,
reflector_cmds,
reflector_hooks
};
|
