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/**
* Copyright (C) 2018-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 "mongo/db/dbmessage.h"
#include "mongo/platform/strnlen.h"
#include "mongo/rpc/object_check.h"
namespace mongo {
DbMessage::DbMessage(const Message& msg) : _msg(msg), _nsStart(nullptr), _mark(nullptr), _nsLen(0) {
// for received messages, Message has only one buffer
_theEnd = _msg.singleData().data() + _msg.singleData().dataLen();
_nextjsobj = _msg.singleData().data();
_reserved = readAndAdvance<int>();
// Read packet for NS
if (messageShouldHaveNs()) {
// Limit = buffer size of message -
// (first int4 in message which is either flags or a zero constant)
size_t limit = _msg.singleData().dataLen() - sizeof(int);
_nsStart = _nextjsobj;
_nsLen = strnlen(_nsStart, limit);
// Validate there is room for a null byte in the buffer
// Strings can be zero length
uassert(18633, "Failed to parse ns string", _nsLen < limit);
_nextjsobj += _nsLen + 1; // skip namespace + null
}
}
const char* DbMessage::getns() const {
verify(messageShouldHaveNs());
return _nsStart;
}
int DbMessage::pullInt() {
return readAndAdvance<int32_t>();
}
long long DbMessage::pullInt64() {
return readAndAdvance<int64_t>();
}
const char* DbMessage::getArray(size_t count) const {
checkRead<long long>(_nextjsobj, count);
return _nextjsobj;
}
BSONObj DbMessage::nextJsObj() {
uassert(ErrorCodes::InvalidBSON,
"Client Error: Remaining data too small for BSON object",
_nextjsobj != nullptr && _theEnd - _nextjsobj >= 5);
if (serverGlobalParams.objcheck) {
Status status = validateBSON(_nextjsobj, _theEnd - _nextjsobj);
uassert(ErrorCodes::InvalidBSON,
str::stream() << "Client Error: bad object in message: " << status.reason(),
status.isOK());
}
BSONObj js(_nextjsobj);
verify(js.objsize() >= 5);
verify(js.objsize() <= (_theEnd - _nextjsobj));
_nextjsobj += js.objsize();
if (_nextjsobj >= _theEnd)
_nextjsobj = nullptr;
return js;
}
void DbMessage::markReset(const char* toMark = nullptr) {
if (toMark == nullptr) {
toMark = _mark;
}
verify(toMark);
_nextjsobj = toMark;
}
template <typename T>
void DbMessage::checkRead(const char* start, size_t count) const {
if ((_theEnd - start) < static_cast<int>(sizeof(T) * count)) {
uassert(18634, "Not enough data to read", false);
}
}
template <typename T>
T DbMessage::read() const {
checkRead<T>(_nextjsobj, 1);
return ConstDataView(_nextjsobj).read<LittleEndian<T>>();
}
template <typename T>
T DbMessage::readAndAdvance() {
T t = read<T>();
_nextjsobj += sizeof(T);
return t;
}
Message makeUnsupportedOpInsertMessage(StringData ns,
const BSONObj* objs,
size_t count,
int flags) {
return makeMessage(dbInsert, [&](BufBuilder& b) {
int reservedFlags = 0;
if (flags & InsertOption_ContinueOnError)
reservedFlags |= InsertOption_ContinueOnError;
b.appendNum(reservedFlags);
b.appendStr(ns);
for (size_t i = 0; i < count; i++) {
objs[i].appendSelfToBufBuilder(b);
}
});
}
DbResponse makeErrorResponseToUnsupportedOpQuery(StringData errorMsg) {
BSONObjBuilder err;
err.append("$err",
str::stream() << errorMsg
<< ". The client driver may require an upgrade. For more details see "
"https://dochub.mongodb.org/core/legacy-opcode-removal");
err.append("code", 5739101);
err.append("ok", 0.0);
BSONObj errObj = err.done();
BufBuilder buffer(sizeof(QueryResult::Value) + errObj.objsize());
buffer.skip(sizeof(QueryResult::Value));
buffer.appendBuf(errObj.objdata(), errObj.objsize());
QueryResult::View qr = buffer.buf();
qr.msgdata().setLen(buffer.len());
qr.msgdata().setOperation(opReply);
qr.setResultFlags(ResultFlag_ErrSet);
qr.setCursorId(0);
qr.setStartingFrom(0);
qr.setNReturned(1);
return DbResponse{Message(buffer.release())};
}
} // namespace mongo
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