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// dbeval.cpp
/**
* Copyright (C) 2012 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kCommand
#include "mongo/platform/basic.h"
#include "mongo/bson/util/builder.h"
#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/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/introspect.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/json.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/s/operation_sharding_state.h"
#include "mongo/s/stale_exception.h"
#include "mongo/scripting/engine.h"
#include "mongo/util/log.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
using std::unique_ptr;
using std::dec;
using std::endl;
using std::string;
using std::stringstream;
namespace {
const int edebug = 0;
bool dbEval(OperationContext* opCtx,
const string& dbName,
const BSONObj& cmd,
BSONObjBuilder& result,
string& errmsg) {
RARELY {
warning() << "the eval command is deprecated" << startupWarningsLog;
}
const BSONElement e = cmd.firstElement();
uassert(
10046, "eval needs Code", e.type() == Code || e.type() == CodeWScope || e.type() == String);
const char* code = 0;
switch (e.type()) {
case String:
case Code:
code = e.valuestr();
break;
case CodeWScope:
code = e.codeWScopeCode();
break;
default:
verify(0);
}
verify(code);
if (!getGlobalScriptEngine()) {
errmsg = "db side execution is disabled";
return false;
}
unique_ptr<Scope> s(getGlobalScriptEngine()->newScope());
s->registerOperation(opCtx);
ScriptingFunction f = s->createFunction(code);
if (f == 0) {
errmsg = string("compile failed: ") + s->getError();
return false;
}
s->localConnectForDbEval(opCtx, dbName.c_str());
if (e.type() == CodeWScope) {
s->init(e.codeWScopeScopeDataUnsafe());
}
BSONObj args;
{
BSONElement argsElement = cmd.getField("args");
if (argsElement.type() == Array) {
args = argsElement.embeddedObject();
if (edebug) {
log() << "args:" << args;
log() << "code:\n" << redact(code);
}
}
}
int res;
{
Timer t;
res = s->invoke(f, &args, 0, 0);
int m = t.millis();
if (m > serverGlobalParams.slowMS) {
log() << "dbeval slow, time: " << dec << m << "ms " << dbName;
if (m >= 1000)
log() << redact(code);
else
OCCASIONALLY log() << redact(code);
}
}
if (res || s->isLastRetNativeCode()) {
result.append("errno", (double)res);
errmsg = "invoke failed: ";
if (s->isLastRetNativeCode())
errmsg += "cannot return native function";
else
errmsg += s->getError();
return false;
}
s->append(result, "retval", "__returnValue");
return true;
}
class CmdEval : public ErrmsgCommandDeprecated {
public:
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kNever;
}
std::string help() const override {
return "DEPRECATED\n"
"Evaluate javascript at the server.\n"
"http://dochub.mongodb.org/core/serversidecodeexecution";
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) const {
RoleGraph::generateUniversalPrivileges(out);
}
CmdEval() : ErrmsgCommandDeprecated("eval", "$eval") {}
bool errmsgRun(OperationContext* opCtx,
const string& dbname,
const BSONObj& cmdObj,
string& errmsg,
BSONObjBuilder& result) {
// Note: 'eval' is not allowed to touch sharded namespaces, but we can't check the
// shardVersions of the namespaces accessed in the script until the script is evaluated.
// Instead, we enforce that the script does not access sharded namespaces by ensuring the
// shardVersion is set to UNSHARDED on the OperationShardingState. The "namespace" used does
// not matter, because if a shardVersion is set on the OperationShardingState, a check for a
// different namespace will default to UNSHARDED.
auto& oss = OperationShardingState::get(opCtx);
uassert(ErrorCodes::IllegalOperation,
"can't send a shardVersion with the 'eval' command, since you can't use sharded "
"collections from 'eval'",
!oss.hasShardVersion());
oss.setShardVersion(NamespaceString(dbname), ChunkVersion::UNSHARDED());
try {
if (cmdObj["nolock"].trueValue()) {
return dbEval(opCtx, dbname, cmdObj, result, errmsg);
}
Lock::GlobalWrite lk(opCtx);
OldClientContext ctx(opCtx, dbname, false /* no shard version checking here */);
return dbEval(opCtx, dbname, cmdObj, result, errmsg);
} catch (const AssertionException& ex) {
// Convert a stale shardVersion error to a stronger error to prevent this node or the
// sending node from believing it needs to refresh its routing table.
if (ex.code() == ErrorCodes::StaleConfig) {
uasserted(ErrorCodes::BadValue,
str::stream() << "can't use sharded collection from db.eval");
}
throw;
}
}
} cmdeval;
} // namespace
} // namespace mongo
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