1 /** @file
2
3 A brief file description
4
5 @section license License
6
7 Licensed to the Apache Software Foundation (ASF) under one
8 or more contributor license agreements. See the NOTICE file
9 distributed with this work for additional information
10 regarding copyright ownership. The ASF licenses this file
11 to you under the Apache License, Version 2.0 (the
12 "License"); you may not use this file except in compliance
13 with the License. You may obtain a copy of the License at
14
15 http://www.apache.org/licenses/LICENSE-2.0
16
17 Unless required by applicable law or agreed to in writing, software
18 distributed under the License is distributed on an "AS IS" BASIS,
19 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
20 See the License for the specific language governing permissions and
21 limitations under the License.
22 */
23
24 /*
25 * replace_header.c:
26 * an example program...
27 *
28 * NOTE: If faced with duplicate headers, this will only detect the
29 * first instance. Operational plugins may need to do more!
30 *
31 * Usage:
32 *
33 *
34 */
35 #include <stdio.h>
36 #include <string.h>
37 #include <ctype.h>
38
39 #include "ts/ts.h"
40 #include "tscore/ink_defs.h"
41
42 #define PLUGIN_NAME "replace_header"
43
44 static void
replace_header(TSHttpTxn txnp)45 replace_header(TSHttpTxn txnp)
46 {
47 TSMBuffer resp_bufp;
48 TSMLoc resp_loc;
49 TSMLoc field_loc;
50
51 if (TSHttpTxnServerRespGet(txnp, &resp_bufp, &resp_loc) != TS_SUCCESS) {
52 TSError("[%s] Couldn't retrieve server response header", PLUGIN_NAME);
53 goto done;
54 }
55
56 field_loc = TSMimeHdrFieldFind(resp_bufp, resp_loc, TS_MIME_FIELD_ACCEPT_RANGES, TS_MIME_LEN_ACCEPT_RANGES);
57 if (field_loc == TS_NULL_MLOC) {
58 /* field was not found */
59
60 /* create a new field in the header */
61 TSMimeHdrFieldCreate(resp_bufp, resp_loc, &field_loc); /* Probably should check for errors. */
62 /* set its name */
63 TSMimeHdrFieldNameSet(resp_bufp, resp_loc, field_loc, TS_MIME_FIELD_ACCEPT_RANGES, TS_MIME_LEN_ACCEPT_RANGES);
64 /* set its value */
65 TSMimeHdrFieldValueAppend(resp_bufp, resp_loc, field_loc, -1, "none", 4);
66 /* insert it into the header */
67 TSMimeHdrFieldAppend(resp_bufp, resp_loc, field_loc);
68 TSHandleMLocRelease(resp_bufp, resp_loc, field_loc);
69 TSHandleMLocRelease(resp_bufp, TS_NULL_MLOC, resp_loc);
70 } else {
71 /* clear the field */
72 TSMimeHdrFieldValuesClear(resp_bufp, resp_loc, field_loc);
73 /* set the value to "none" */
74 TSMimeHdrFieldValueStringInsert(resp_bufp, resp_loc, field_loc, -1, "none", 4);
75 TSHandleMLocRelease(resp_bufp, resp_loc, field_loc);
76 TSHandleMLocRelease(resp_bufp, TS_NULL_MLOC, resp_loc);
77 }
78
79 done:
80 TSHttpTxnReenable(txnp, TS_EVENT_HTTP_CONTINUE);
81 }
82
83 static int
replace_header_plugin(TSCont contp ATS_UNUSED,TSEvent event,void * edata)84 replace_header_plugin(TSCont contp ATS_UNUSED, TSEvent event, void *edata)
85 {
86 TSHttpTxn txnp = (TSHttpTxn)edata;
87
88 switch (event) {
89 case TS_EVENT_HTTP_READ_RESPONSE_HDR:
90 replace_header(txnp);
91 return 0;
92 default:
93 break;
94 }
95 return 0;
96 }
97
98 void
TSPluginInit(int argc ATS_UNUSED,const char * argv[]ATS_UNUSED)99 TSPluginInit(int argc ATS_UNUSED, const char *argv[] ATS_UNUSED)
100 {
101 TSPluginRegistrationInfo info;
102
103 info.plugin_name = PLUGIN_NAME;
104 info.vendor_name = "Apache Software Foundation";
105 info.support_email = "dev@trafficserver.apache.org";
106
107 if (TSPluginRegister(&info) != TS_SUCCESS) {
108 TSError("[%s] Plugin registration failed", PLUGIN_NAME);
109 }
110
111 TSHttpHookAdd(TS_HTTP_READ_RESPONSE_HDR_HOOK, TSContCreate(replace_header_plugin, NULL));
112 }
113