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/**
* Copyright (C) 2008 10gen 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/pch.h"
#include "mongo/base/init.h"
#include "mongo/base/status.h"
#include "mongo/bson/util/builder.h"
#include "mongo/client/dbclientinterface.h"
#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/resource_pattern.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/cloner.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/copydb.h"
#include "mongo/db/commands/copydb_getnonce.h"
#include "mongo/db/commands/rename_collection.h"
#include "mongo/db/db.h"
#include "mongo/db/dbhelpers.h"
#include "mongo/db/index_builder.h"
#include "mongo/db/instance.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/kill_current_op.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/repl/oplog.h"
#include "mongo/db/repl/oplogreader.h"
#include "mongo/db/pdfile.h"
#include "mongo/db/operation_context_impl.h"
#include "mongo/db/storage_options.h"
namespace mongo {
/* Usage:
* admindb.$cmd.findOne( { copydb: 1, fromhost: <connection string>, fromdb: <db>,
* todb: <db>[, username: <username>, nonce: <nonce>, key: <key>] } );
*
* The "copydb" command is used to copy a database. Note that this is a very broad definition.
* This means that the "copydb" command can be used in the following ways:
*
* 1. To copy a database within a single node
* 2. To copy a database within a sharded cluster, possibly to another shard
* 3. To copy a database from one cluster to another
*
* Note that in all cases both the target and source database must be unsharded.
*
* The "copydb" command gets sent by the client or the mongos to the destination of the copy
* operation. The node, cluster, or shard that recieves the "copydb" command must then query
* the source of the database to be copied for all the contents and metadata of the database.
*
*
*
* When used with auth, there are two different considerations.
*
* The first is authentication with the target. The only entity that needs to authenticate with
* the target node is the client, so authentication works there the same as it would with any
* other command.
*
* The second is the authentication of the target with the source, which is needed because the
* target must query the source directly for the contents of the database. To do this, the
* client must use the "copydbgetnonce" command, in which the target will get a nonce from the
* source and send it back to the client. The client can then hash its password with the nonce,
* send it to the target when it runs the "copydb" command, which can then use that information
* to authenticate with the source.
*
* NOTE: mongos doesn't know how to call or handle the "copydbgetnonce" command. See
* SERVER-6427.
*
* NOTE: Since internal cluster auth works differently, "copydb" currently doesn't work between
* shards in a cluster when auth is enabled. See SERVER-13080.
*/
class CmdCopyDb : public Command {
public:
CmdCopyDb() : Command("copydb") { }
virtual bool adminOnly() const {
return true;
}
virtual bool slaveOk() const {
return false;
}
virtual bool isWriteCommandForConfigServer() const { return false; }
virtual Status checkAuthForCommand(ClientBasic* client,
const std::string& dbname,
const BSONObj& cmdObj) {
return copydb::checkAuthForCopydbCommand(client, dbname, cmdObj);
}
virtual void help( stringstream &help ) const {
help << "copy a database from another host to this host\n";
help << "usage: {copydb: 1, fromhost: <connection string>, fromdb: <db>, todb: <db>"
<< "[, slaveOk: <bool>, username: <username>, nonce: <nonce>, key: <key>]}";
}
virtual bool run(OperationContext* txn,
const string& dbname,
BSONObj& cmdObj,
int,
string& errmsg,
BSONObjBuilder& result,
bool fromRepl) {
string fromhost = cmdObj.getStringField("fromhost");
bool fromSelf = fromhost.empty();
if ( fromSelf ) {
/* copy from self */
stringstream ss;
ss << "localhost:" << serverGlobalParams.port;
fromhost = ss.str();
}
CloneOptions cloneOptions;
cloneOptions.fromDB = cmdObj.getStringField("fromdb");
cloneOptions.logForRepl = !fromRepl;
cloneOptions.slaveOk = cmdObj["slaveOk"].trueValue();
cloneOptions.useReplAuth = false;
cloneOptions.snapshot = true;
cloneOptions.mayYield = true;
cloneOptions.mayBeInterrupted = false;
string todb = cmdObj.getStringField("todb");
if ( fromhost.empty() || todb.empty() || cloneOptions.fromDB.empty() ) {
errmsg = "parms missing - {copydb: 1, fromhost: <connection string>, "
"fromdb: <db>, todb: <db>}";
return false;
}
// SERVER-4328 todo lock just the two db's not everything for the fromself case
scoped_ptr<Lock::ScopedLock> lk( fromSelf ?
static_cast<Lock::ScopedLock*>(new Lock::GlobalWrite()) :
static_cast<Lock::ScopedLock*>(new Lock::DBWrite(txn->lockState(), todb)));
Cloner cloner;
string username = cmdObj.getStringField( "username" );
string nonce = cmdObj.getStringField( "nonce" );
string key = cmdObj.getStringField( "key" );
if ( !username.empty() && !nonce.empty() && !key.empty() ) {
uassert( 13008, "must call copydbgetnonce first", authConn_.get() );
BSONObj ret;
{
dbtemprelease t;
if ( !authConn_->runCommand( cloneOptions.fromDB,
BSON( "authenticate" << 1 << "user" << username
<< "nonce" << nonce << "key" << key ), ret ) ) {
errmsg = "unable to login " + ret.toString();
return false;
}
}
cloner.setConnection( authConn_.release() );
}
else if (!fromSelf) {
// If fromSelf leave the cloner's conn empty, it will use a DBDirectClient instead.
ConnectionString cs = ConnectionString::parse(fromhost, errmsg);
if (!cs.isValid()) {
return false;
}
DBClientBase* conn = cs.connect(errmsg);
if (!conn) {
return false;
}
cloner.setConnection(conn);
}
Client::Context ctx(todb);
return cloner.go(txn, ctx, fromhost, cloneOptions, NULL, errmsg );
}
} cmdCopyDB;
} // namespace mongo
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