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/**
* Copyright (C) 2015 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/auth/sasl_mechanism_registry.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/logical_session_id.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/ops/write_ops.h"
#include "mongo/db/server_parameters.h"
#include "mongo/db/wire_version.h"
#include "mongo/rpc/metadata/client_metadata.h"
#include "mongo/rpc/metadata/client_metadata_ismaster.h"
#include "mongo/transport/message_compressor_manager.h"
#include "mongo/util/map_util.h"
#include "mongo/util/net/socket_utils.h"
#include "mongo/util/version.h"
namespace mongo {
namespace {
class CmdIsMaster : public BasicCommand {
public:
CmdIsMaster() : BasicCommand("isMaster", "ismaster") {}
bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kAlways;
}
std::string help() const override {
return "test if this is master half of a replica pair";
}
void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) const override {
// No auth required
}
bool requiresAuth() const override {
return false;
}
bool run(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmdObj,
BSONObjBuilder& result) override {
auto& clientMetadataIsMasterState = ClientMetadataIsMasterState::get(opCtx->getClient());
bool seenIsMaster = clientMetadataIsMasterState.hasSeenIsMaster();
if (!seenIsMaster) {
clientMetadataIsMasterState.setSeenIsMaster();
}
BSONElement element = cmdObj[kMetadataDocumentName];
if (!element.eoo()) {
if (seenIsMaster) {
uasserted(ErrorCodes::ClientMetadataCannotBeMutated,
"The client metadata document may only be sent in the first isMaster");
}
auto swParseClientMetadata = ClientMetadata::parse(element);
uassertStatusOK(swParseClientMetadata.getStatus());
invariant(swParseClientMetadata.getValue());
swParseClientMetadata.getValue().get().logClientMetadata(opCtx->getClient());
swParseClientMetadata.getValue().get().setMongoSMetadata(
getHostNameCachedAndPort(),
opCtx->getClient()->clientAddress(true),
VersionInfoInterface::instance().version());
clientMetadataIsMasterState.setClientMetadata(
opCtx->getClient(), std::move(swParseClientMetadata.getValue()));
}
result.appendBool("ismaster", true);
result.append("msg", "isdbgrid");
result.appendNumber("maxBsonObjectSize", BSONObjMaxUserSize);
result.appendNumber("maxMessageSizeBytes", MaxMessageSizeBytes);
result.appendNumber("maxWriteBatchSize", write_ops::kMaxWriteBatchSize);
result.appendDate("localTime", jsTime());
result.append("logicalSessionTimeoutMinutes", localLogicalSessionTimeoutMinutes);
result.appendNumber("connectionId", opCtx->getClient()->getConnectionId());
// Mongos tries to keep exactly the same version range of the server for which
// it is compiled.
result.append("maxWireVersion", WireSpec::instance().incomingExternalClient.maxWireVersion);
result.append("minWireVersion", WireSpec::instance().incomingExternalClient.minWireVersion);
const auto parameter = mapFindWithDefault(ServerParameterSet::getGlobal()->getMap(),
"automationServiceDescriptor",
static_cast<ServerParameter*>(nullptr));
if (parameter)
parameter->append(opCtx, result, "automationServiceDescriptor");
MessageCompressorManager::forSession(opCtx->getClient()->session())
.serverNegotiate(cmdObj, &result);
auto& saslMechanismRegistry = SASLServerMechanismRegistry::get(opCtx->getServiceContext());
saslMechanismRegistry.advertiseMechanismNamesForUser(opCtx, cmdObj, &result);
return true;
}
} isMaster;
} // namespace
} // namespace mongo
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