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/** @file
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 <cstdlib>
#include <stdio.h>
#include <cstdio>
#include <strings.h>
#include <string_view>
#include <sstream>
#include <cstring>
#include <getopt.h>
#define DEBUG_TAG_LOG_HEADERS "xdebug.headers"
class EscapeCharForJson
{
public:
std::string_view
operator()(char const &c)
{
if ((_state != IN_VALUE) && ((' ' == c) || ('\t' == c))) {
return {""};
}
if ((IN_NAME == _state) && (':' == c)) {
_state = BEFORE_VALUE;
return {"' : '"};
}
if ('\r' == c) {
return {""};
}
if ('\n' == c) {
std::string_view result{_after_value()};
if (BEFORE_NAME == _state) {
return {""};
} else if (BEFORE_VALUE == _state) {
// Failsafe -- missing value -- this should never happen.
result = _missing_value();
}
_state = BEFORE_NAME;
return result;
}
if (BEFORE_NAME == _state) {
_state = IN_NAME;
} else if (BEFORE_VALUE == _state) {
_state = IN_VALUE;
}
switch (c) {
case '\'':
return {"\\\'"};
case '"':
return {"\\\""};
case '\\':
return {"\\\\"};
case '\b':
return {"\\b"};
case '\f':
return {"\\f"};
case '\t':
return {"\\t"};
default:
return {&c, 1};
}
}
// After last header line, back up and throw away everything but the closing quote.
//
static std::size_t
backup()
{
return _after_value().size() - 1;
}
private:
static std::string_view
_missing_value()
{
return {"' : '',\n\t'"};
}
static std::string_view
_after_name()
{
return {_missing_value().data(), 5};
}
static std::string_view
_after_value()
{
return {_missing_value().data() + 5, 5};
}
enum _State { BEFORE_NAME, IN_NAME, BEFORE_VALUE, IN_VALUE };
_State _state{BEFORE_VALUE};
};
///////////////////////////////////////////////////////////////////////////
// Dump a header on stderr, useful together with TSDebug().
void
print_headers(TSHttpTxn txn, TSMBuffer bufp, TSMLoc hdr_loc, std::stringstream &ss)
{
TSIOBuffer output_buffer;
TSIOBufferReader reader;
TSIOBufferBlock block;
const char *block_start;
int64_t block_avail;
EscapeCharForJson escape_char_for_json;
output_buffer = TSIOBufferCreate();
reader = TSIOBufferReaderAlloc(output_buffer);
ss << "\t'Start-Line' : '";
// Print all message header lines.
TSHttpHdrPrint(bufp, hdr_loc, output_buffer);
/* We need to loop over all the buffer blocks, there can be more than 1 */
block = TSIOBufferReaderStart(reader);
do {
block_start = TSIOBufferBlockReadStart(block, reader, &block_avail);
for (const char *c = block_start; c < block_start + block_avail; ++c) {
ss << escape_char_for_json(*c);
}
TSIOBufferReaderConsume(reader, block_avail);
block = TSIOBufferReaderStart(reader);
} while (block && block_avail != 0);
ss.seekp(-escape_char_for_json.backup(), std::ios_base::end);
/* Free up the TSIOBuffer that we used to print out the header */
TSIOBufferReaderFree(reader);
TSIOBufferDestroy(output_buffer);
TSDebug(DEBUG_TAG_LOG_HEADERS, "%.*s", static_cast<int>(ss.tellp()), ss.str().data());
}
void
log_headers(TSHttpTxn txn, TSMBuffer bufp, TSMLoc hdr_loc, char const *type_msg)
{
if (TSIsDebugTagSet(DEBUG_TAG_LOG_HEADERS)) {
std::stringstream output;
print_headers(txn, bufp, hdr_loc, output);
TSDebug(DEBUG_TAG_LOG_HEADERS, "\n=============\n %s headers are... \n %s", type_msg, output.str().c_str());
}
}
void
print_request_headers(TSHttpTxn txn, std::stringstream &output)
{
TSMBuffer buf_c, buf_s;
TSMLoc hdr_loc;
if (TSHttpTxnClientReqGet(txn, &buf_c, &hdr_loc) == TS_SUCCESS) {
output << "{'type':'request', 'side':'client', 'headers': {\n";
print_headers(txn, buf_c, hdr_loc, output);
output << "\n\t}}";
TSHandleMLocRelease(buf_c, TS_NULL_MLOC, hdr_loc);
}
if (TSHttpTxnServerReqGet(txn, &buf_s, &hdr_loc) == TS_SUCCESS) {
output << ",{'type':'request', 'side':'server', 'headers': {\n";
print_headers(txn, buf_s, hdr_loc, output);
output << "\n\t}}";
TSHandleMLocRelease(buf_s, TS_NULL_MLOC, hdr_loc);
}
}
void
print_response_headers(TSHttpTxn txn, std::stringstream &output)
{
TSMBuffer buf_c, buf_s;
TSMLoc hdr_loc;
if (TSHttpTxnServerRespGet(txn, &buf_s, &hdr_loc) == TS_SUCCESS) {
output << "{'type':'response', 'side':'server', 'headers': {\n";
print_headers(txn, buf_s, hdr_loc, output);
output << "\n\t}},";
TSHandleMLocRelease(buf_s, TS_NULL_MLOC, hdr_loc);
}
if (TSHttpTxnClientRespGet(txn, &buf_c, &hdr_loc) == TS_SUCCESS) {
output << "{'type':'response', 'side':'client', 'headers': {\n";
print_headers(txn, buf_c, hdr_loc, output);
output << "\n\t}}";
TSHandleMLocRelease(buf_c, TS_NULL_MLOC, hdr_loc);
}
}
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