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/**
* Copyright (C) 2021-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include <type_traits>
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/util/builder.h"
#include "mongo/rpc/op_msg.h"
#include "third_party/wiredtiger/wiredtiger.h"
namespace mongo {
namespace rpc {
namespace test {
// Section bytes
constexpr char kBodySection = 0;
constexpr char kDocSequenceSection = 1;
constexpr char kSecurityTokenSection = 2;
// Makes a SharedBuffer out of arguments passed to constructor.
class Bytes {
public:
template <typename... T>
explicit Bytes(T&&... args) {
append(args...);
}
protected:
void append() {} // no-op base case
template <typename T, typename... Rest>
std::enable_if_t<std::is_integral<T>::value> append(T arg, Rest&&... rest) {
// Make sure BufBuilder has a real overload of this exact type and it isn't implicitly
// converted.
(void)static_cast<void (BufBuilder::*)(T)>(&BufBuilder::appendNum);
buffer.appendNum(arg); // automatically little endian.
append(rest...);
}
template <typename... Rest>
void append(const BSONObj& arg, Rest&&... rest) {
arg.appendSelfToBufBuilder(buffer);
append(rest...);
}
template <typename... Rest>
void append(const Bytes& arg, Rest&&... rest) {
buffer.appendBuf(arg.buffer.buf(), arg.buffer.len());
append(rest...);
}
template <typename... Rest>
void append(StringData arg, Rest&&... rest) {
buffer.appendStr(arg, /* null terminate*/ true);
append(rest...);
}
BufBuilder buffer;
};
// A Bytes that puts the size of the buffer at the front as a little-endian int32
class Sized : public Bytes {
public:
template <typename... T>
explicit Sized(T&&... args) {
buffer.skip(sizeof(int32_t));
append(args...);
updateSize();
}
// Adds extra to the stored size. Use this to produce illegal messages.
Sized&& addToSize(int32_t extra) && {
updateSize(extra);
return std::move(*this);
}
protected:
void updateSize(int32_t extra = 0) {
DataView(buffer.buf()).write<LittleEndian<int32_t>>(buffer.len() + extra);
}
};
// A Bytes that puts the standard message header at the front.
class OpMsgBytes : public Sized {
public:
template <typename... T>
explicit OpMsgBytes(T&&... args)
: Sized{int32_t{1}, // requestId
int32_t{2}, // replyId
int32_t{dbMsg}, // opCode
args...} {}
Message done() {
const auto orig = Message(buffer.release());
// Copy the message to an exact-sized allocation so ASAN can detect out-of-bounds accesses.
auto copy = SharedBuffer::allocate(orig.size());
memcpy(copy.get(), orig.buf(), orig.size());
return Message(std::move(copy));
}
OpMsg parse() {
return OpMsg::parseOwned(done());
}
OpMsg parse(Client* client) {
return OpMsg::parseOwned(done(), client);
}
OpMsgBytes&& addToSize(int32_t extra) && {
updateSize(extra);
return std::move(*this);
}
OpMsgBytes&& appendChecksum() && {
// Reserve space at the end for the checksum.
append<uint32_t>(0);
updateSize();
// Checksum all bits except the checksum itself.
uint32_t checksum = wiredtiger_crc32c_func()(buffer.buf(), buffer.len() - 4);
// Write the checksum bits at the end.
auto checksumBits = DataView(buffer.buf() + buffer.len() - sizeof(checksum));
checksumBits.write<LittleEndian<uint32_t>>(checksum);
return std::move(*this);
}
OpMsgBytes&& appendChecksum(uint32_t checksum) && {
append(checksum);
updateSize();
return std::move(*this);
}
};
} // namespace test
} // namespace rpc
} // namespace mongo
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