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/**
* Copyright (C) 2008-2016 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kCommand
#include "mongo/platform/basic.h"
#include <string>
#include <vector>
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/authorization_manager_global.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/auth/resource_pattern.h"
#include "mongo/db/catalog/apply_ops.h"
#include "mongo/db/catalog/document_validation.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/dbhash.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/matcher/matcher.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repl/oplog.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/repl/replication_coordinator_global.h"
#include "mongo/db/service_context.h"
#include "mongo/util/log.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
using std::string;
using std::stringstream;
namespace {
class ApplyOpsCmd : public Command {
public:
ApplyOpsCmd() : Command("applyOps") {}
virtual bool slaveOk() const {
return false;
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return true;
}
virtual void help(stringstream& help) const {
help << "internal (sharding)\n{ applyOps : [ ] , preCondition : [ { ns : ... , q : ... , "
"res : ... } ] }";
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
// applyOps can do pretty much anything, so require all privileges.
RoleGraph::generateUniversalPrivileges(out);
}
virtual bool run(OperationContext* txn,
const string& dbname,
BSONObj& cmdObj,
int,
string& errmsg,
BSONObjBuilder& result) {
boost::optional<DisableDocumentValidation> maybeDisableValidation;
if (shouldBypassDocumentValidationForCommand(cmdObj))
maybeDisableValidation.emplace(txn);
if (cmdObj.firstElement().type() != Array) {
errmsg = "ops has to be an array";
return false;
}
BSONObj ops = cmdObj.firstElement().Obj();
{
// check input
BSONObjIterator i(ops);
while (i.more()) {
BSONElement e = i.next();
if (!_checkOperation(e, errmsg)) {
return false;
}
}
}
auto client = txn->getClient();
auto lastOpAtOperationStart = repl::ReplClientInfo::forClient(client).getLastOp();
ScopeGuard lastOpSetterGuard =
MakeObjGuard(repl::ReplClientInfo::forClient(client),
&repl::ReplClientInfo::setLastOpToSystemLastOpTime,
txn);
auto applyOpsStatus = appendCommandStatus(result, applyOps(txn, dbname, cmdObj, &result));
if (repl::ReplClientInfo::forClient(client).getLastOp() != lastOpAtOperationStart) {
// If this operation has already generated a new lastOp, don't bother setting it
// here. No-op applyOps will not generate a new lastOp, so we still need the guard to
// fire in that case.
lastOpSetterGuard.Dismiss();
}
return applyOpsStatus;
}
private:
/**
* Returns true if 'e' contains a valid operation.
*/
bool _checkOperation(const BSONElement& e, string& errmsg) {
if (e.type() != Object) {
errmsg = str::stream() << "op not an object: " << e.fieldName();
return false;
}
BSONObj obj = e.Obj();
// op - operation type
BSONElement opElement = obj.getField("op");
if (opElement.eoo()) {
errmsg = str::stream() << "op does not contain required \"op\" field: "
<< e.fieldName();
return false;
}
if (opElement.type() != mongo::String) {
errmsg = str::stream() << "\"op\" field is not a string: " << e.fieldName();
return false;
}
// operation type -- see logOp() comments for types
const char* opType = opElement.valuestrsafe();
if (*opType == '\0') {
errmsg = str::stream() << "\"op\" field value cannot be empty: " << e.fieldName();
return false;
}
// ns - namespace
// Only operations of type 'n' are allowed to have an empty namespace.
BSONElement nsElement = obj.getField("ns");
if (nsElement.eoo()) {
errmsg = str::stream() << "op does not contain required \"ns\" field: "
<< e.fieldName();
return false;
}
if (nsElement.type() != mongo::String) {
errmsg = str::stream() << "\"ns\" field is not a string: " << e.fieldName();
return false;
}
if (nsElement.String().find('\0') != std::string::npos) {
errmsg = str::stream() << "namespaces cannot have embedded null characters";
return false;
}
if (*opType != 'n' && nsElement.String().empty()) {
errmsg = str::stream() << "\"ns\" field value cannot be empty when op type is not 'n': "
<< e.fieldName();
return false;
}
return true;
}
} applyOpsCmd;
} // namespace
} // namespace mongo
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