summaryrefslogtreecommitdiff
path: root/src/mongo/db/commands.cpp
blob: 36bb2a37da67a5ec0b60a4d4a1ef89d9d08139ba (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
/* commands.cpp
   db "commands" (sent via db.$cmd.findOne(...))
 */

/*    Copyright 2009 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/db/commands.h"

#include <string>
#include <vector>

#include "mongo/bson/mutable/document.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/db/audit.h"
#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/client.h"
#include "mongo/db/get_status_from_command_result.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/server_parameters.h"
#include "mongo/util/log.h"

namespace mongo {

    using std::string;
    using std::stringstream;
    using std::endl;

    using logger::LogComponent;

    Command::CommandMap* Command::_commandsByBestName;
    Command::CommandMap* Command::_webCommands;
    Command::CommandMap* Command::_commands;

    int Command::testCommandsEnabled = 0;

    Counter64 Command::unknownCommands;
    static ServerStatusMetricField<Counter64> displayUnknownCommands( "commands.<UNKNOWN>",
        &Command::unknownCommands );

    namespace {
        ExportedServerParameter<int> testCommandsParameter(ServerParameterSet::getGlobal(),
                                                           "enableTestCommands",
                                                           &Command::testCommandsEnabled,
                                                           true,
                                                           false);
    }

    string Command::parseNsFullyQualified(const string& dbname, const BSONObj& cmdObj) const {
        BSONElement first = cmdObj.firstElement();
        uassert(17005,
                mongoutils::str::stream() << "Main argument to " << first.fieldNameStringData() <<
                        " must be a fully qualified namespace string.  Found: " <<
                        first.toString(false),
                first.type() == mongo::String &&
                NamespaceString::validCollectionComponent(first.valuestr()));
        return first.String();
    }

    string Command::parseNsCollectionRequired(const string& dbname, const BSONObj& cmdObj) const {
        // Accepts both BSON String and Symbol for collection name per SERVER-16260
        // TODO(kangas) remove Symbol support in MongoDB 3.0 after Ruby driver audit
        BSONElement first = cmdObj.firstElement();
        uassert(17009,
                "no collection name specified",
                first.canonicalType() == canonicalizeBSONType(mongo::String)
                && first.valuestrsize() > 0);
        std::string coll = first.valuestr();
        return dbname + '.' + coll;
    }

    /*virtual*/ string Command::parseNs(const string& dbname, const BSONObj& cmdObj) const {
        BSONElement first = cmdObj.firstElement();
        if (first.type() != mongo::String)
            return dbname;

        string coll = cmdObj.firstElement().valuestr();
#if defined(CLC)
        DEV if( mongoutils::str::startsWith(coll, dbname+'.') ) { 
            log() << "DEBUG parseNs Command's collection name looks like it includes the db name\n"
                << dbname << '\n' 
                << coll << '\n'
                << cmdObj.toString() << endl;
            dassert(false);
        }
#endif
        return dbname + '.' + coll;
    }

    ResourcePattern Command::parseResourcePattern(const std::string& dbname,
                                                  const BSONObj& cmdObj) const {
        std::string ns = parseNs(dbname, cmdObj);
        if (ns.find('.') == std::string::npos) {
            return ResourcePattern::forDatabaseName(ns);
        }
        return ResourcePattern::forExactNamespace(NamespaceString(ns));
    }

    void Command::htmlHelp(stringstream& ss) const {
        string helpStr;
        {
            stringstream h;
            help(h);
            helpStr = h.str();
        }
        ss << "\n<tr><td>";
        bool web = _webCommands->find(name) != _webCommands->end();
        if( web ) ss << "<a href=\"/" << name << "?text=1\">";
        ss << name;
        if( web ) ss << "</a>";
        ss << "</td>\n";
        ss << "<td>";
        if (isWriteCommandForConfigServer()) { 
            ss << "W "; 
        }
        else { 
            ss << "R "; 
        }
        if( slaveOk() )
            ss << "S ";
        if( adminOnly() )
            ss << "A";
        ss << "</td>";
        ss << "<td>";
        if( helpStr != "no help defined" ) {
            const char *p = helpStr.c_str();
            while( *p ) {
                if( *p == '<' ) {
                    ss << "&lt;";
                    p++; continue;
                }
                else if( *p == '{' )
                    ss << "<code>";
                else if( *p == '}' ) {
                    ss << "}</code>";
                    p++;
                    continue;
                }
                if( strncmp(p, "http:", 5) == 0 ) {
                    ss << "<a href=\"";
                    const char *q = p;
                    while( *q && *q != ' ' && *q != '\n' )
                        ss << *q++;
                    ss << "\">";
                    q = p;
                    if( str::startsWith(q, "http://www.mongodb.org/display/") )
                        q += 31;
                    while( *q && *q != ' ' && *q != '\n' ) {
                        ss << (*q == '+' ? ' ' : *q);
                        q++;
                        if( *q == '#' )
                            while( *q && *q != ' ' && *q != '\n' ) q++;
                    }
                    ss << "</a>";
                    p = q;
                    continue;
                }
                if( *p == '\n' ) ss << "<br>";
                else ss << *p;
                p++;
            }
        }
        ss << "</td>";
        ss << "</tr>\n";
    }

    Command::Command(StringData _name, bool web, StringData oldName) :
        name(_name.toString()),
        _commandsExecutedMetric("commands."+ _name.toString()+".total", &_commandsExecuted),
        _commandsFailedMetric("commands."+ _name.toString()+".failed", &_commandsFailed) {
        // register ourself.
        if ( _commands == 0 )
            _commands = new CommandMap();
        if( _commandsByBestName == 0 )
            _commandsByBestName = new CommandMap();
        Command*& c = (*_commands)[name];
        if ( c )
            log() << "warning: 2 commands with name: " << _name << endl;
        c = this;
        (*_commandsByBestName)[name] = this;

        if( web ) {
            if( _webCommands == 0 )
                _webCommands = new CommandMap();
            (*_webCommands)[name] = this;
        }

        if( !oldName.empty() )
            (*_commands)[oldName.toString()] = this;
    }

    void Command::help( stringstream& help ) const {
        help << "no help defined";
    }

    std::vector<BSONObj> Command::stopIndexBuilds(OperationContext* opCtx,
                                                  Database* db,
                                                  const BSONObj& cmdObj) {
        return std::vector<BSONObj>();
    }

    Command* Command::findCommand( const StringData& name ) {
        CommandMap::const_iterator i = _commands->find( name );
        if ( i == _commands->end() )
            return 0;
        return i->second;
    }

    bool Command::appendCommandStatus(BSONObjBuilder& result, const Status& status) {
        appendCommandStatus(result, status.isOK(), status.reason());
        BSONObj tmp = result.asTempObj();
        if (!status.isOK() && !tmp.hasField("code")) {
            result.append("code", status.code());
        }
        return status.isOK();
    }

    void Command::appendCommandStatus(BSONObjBuilder& result, bool ok, const std::string& errmsg) {
        BSONObj tmp = result.asTempObj();
        bool have_ok = tmp.hasField("ok");
        bool have_errmsg = tmp.hasField("errmsg");

        if (!have_ok)
            result.append( "ok" , ok ? 1.0 : 0.0 );

        if (!ok && !have_errmsg) {
            result.append("errmsg", errmsg);
        }
    }

    Status Command::getStatusFromCommandResult(const BSONObj& result) {
        return mongo::getStatusFromCommandResult(result);
    }

    Status Command::parseCommandCursorOptions(const BSONObj& cmdObj,
                                              long long defaultBatchSize,
                                              long long* batchSize) {
        invariant(batchSize);
        *batchSize = defaultBatchSize;

        BSONElement cursorElem = cmdObj["cursor"];
        if (cursorElem.eoo()) {
            return Status::OK();
        }

        if (cursorElem.type() != mongo::Object) {
            return Status(ErrorCodes::TypeMismatch, "cursor field must be missing or an object");
        }

        BSONObj cursor = cursorElem.embeddedObject();
        BSONElement batchSizeElem = cursor["batchSize"];
        if (batchSizeElem.eoo()) {
            if (!cursor.isEmpty()) {
                return Status(ErrorCodes::BadValue,
                              "cursor object can't contain fields other than batchSize");
            }

            return Status::OK();
        }

        if (!batchSizeElem.isNumber()) {
            return Status(ErrorCodes::TypeMismatch, "cursor.batchSize must be a number");
        }

        // This can change in the future, but for now all negatives are reserved.
        if (batchSizeElem.numberLong() < 0) {
            return Status(ErrorCodes::BadValue, "cursor.batchSize must not be negative");
        }

        *batchSize = batchSizeElem.numberLong();

        return Status::OK();
    }

    void Command::appendCursorResponseObject(long long cursorId,
                                             StringData cursorNamespace,
                                             BSONArray firstBatch,
                                             BSONObjBuilder* builder) {
        BSONObjBuilder cursorObj(builder->subobjStart("cursor"));
        cursorObj.append("id", cursorId);
        cursorObj.append("ns", cursorNamespace);
        cursorObj.append("firstBatch", firstBatch);
        cursorObj.done();
    }

    Status Command::checkAuthForCommand(ClientBasic* client,
                                        const std::string& dbname,
                                        const BSONObj& cmdObj) {
        std::vector<Privilege> privileges;
        this->addRequiredPrivileges(dbname, cmdObj, &privileges);
        if (client->getAuthorizationSession()->isAuthorizedForPrivileges(privileges))
            return Status::OK();
        return Status(ErrorCodes::Unauthorized, "unauthorized");
    }

    void Command::redactForLogging(mutablebson::Document* cmdObj) {}

    BSONObj Command::getRedactedCopyForLogging(const BSONObj& cmdObj) {
        namespace mmb = mutablebson;
        mmb::Document cmdToLog(cmdObj, mmb::Document::kInPlaceDisabled);
        redactForLogging(&cmdToLog);
        BSONObjBuilder bob;
        cmdToLog.writeTo(&bob);
        return bob.obj();
    }

    void Command::logIfSlow( const Timer& timer, const string& msg ) {
        int ms = timer.millis();
        if (ms > serverGlobalParams.slowMS) {
            log() << msg << " took " << ms << " ms." << endl;
        }
    }

    static Status _checkAuthorizationImpl(Command* c,
                                          ClientBasic* client,
                                          const std::string& dbname,
                                          const BSONObj& cmdObj,
                                          bool fromRepl) {
        namespace mmb = mutablebson;
        if ( c->adminOnly() && ! fromRepl && dbname != "admin" ) {
            return Status(ErrorCodes::Unauthorized, str::stream() << c->name <<
                          " may only be run against the admin database.");
        }
        if (client->getAuthorizationSession()->getAuthorizationManager().isAuthEnabled()) {
            Status status = c->checkAuthForCommand(client, dbname, cmdObj);
            if (status == ErrorCodes::Unauthorized) {
                mmb::Document cmdToLog(cmdObj, mmb::Document::kInPlaceDisabled);
                c->redactForLogging(&cmdToLog);
                return Status(ErrorCodes::Unauthorized,
                              str::stream() << "not authorized on " << dbname <<
                              " to execute command " << cmdToLog.toString());
            }
            if (!status.isOK()) {
                return status;
            }
        }
        else if (c->adminOnly() &&
                 c->localHostOnlyIfNoAuth(cmdObj) &&
                 !client->getIsLocalHostConnection()) {

            return Status(ErrorCodes::Unauthorized, str::stream() << c->name <<
                          " must run from localhost when running db without auth");
        }
        return Status::OK();
    }

    Status Command::_checkAuthorization(Command* c,
                                        ClientBasic* client,
                                        const std::string& dbname,
                                        const BSONObj& cmdObj,
                                        bool fromRepl) {
        namespace mmb = mutablebson;
        Status status = _checkAuthorizationImpl(c, client, dbname, cmdObj, fromRepl);
        if (!status.isOK()) {
            log(LogComponent::kAccessControl) << status << std::endl;
        }
        audit::logCommandAuthzCheck(client,
                                    dbname,
                                    cmdObj,
                                    c,
                                    status.code());
        return status;
    }
}

#include "mongo/client/connpool.h"

namespace mongo {

    extern DBConnectionPool pool;
    // This is mainly used by the internal writes using write commands.
    extern DBConnectionPool shardConnectionPool;

    class PoolFlushCmd : public Command {
    public:
        PoolFlushCmd() : Command( "connPoolSync" , false , "connpoolsync" ) {}
        virtual void help( stringstream &help ) const { help<<"internal"; }
        virtual bool isWriteCommandForConfigServer() const { return false; }
        virtual void addRequiredPrivileges(const std::string& dbname,
                                           const BSONObj& cmdObj,
                                           std::vector<Privilege>* out) {
            ActionSet actions;
            actions.addAction(ActionType::connPoolSync);
            out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
        }

        virtual bool run(OperationContext* txn, const string&, mongo::BSONObj&, int, std::string&, mongo::BSONObjBuilder& result, bool) {
            shardConnectionPool.flush();
            pool.flush();
            return true;
        }
        virtual bool slaveOk() const {
            return true;
        }

    } poolFlushCmd;

    class PoolStats : public Command {
    public:
        PoolStats() : Command( "connPoolStats" ) {}
        virtual void help( stringstream &help ) const { help<<"stats about connection pool"; }
        virtual bool isWriteCommandForConfigServer() const { return false; }
        virtual void addRequiredPrivileges(const std::string& dbname,
                                           const BSONObj& cmdObj,
                                           std::vector<Privilege>* out) {
            ActionSet actions;
            actions.addAction(ActionType::connPoolStats);
            out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
        }
        virtual bool run(OperationContext* txn, const string&, mongo::BSONObj&, int, std::string&, mongo::BSONObjBuilder& result, bool) {
            pool.appendInfo( result );
            result.append( "numDBClientConnection" , DBClientConnection::getNumConnections() );
            result.append( "numAScopedConnection" , AScopedConnection::getNumConnections() );
            return true;
        }
        virtual bool slaveOk() const {
            return true;
        }

    } poolStatsCmd;

} // namespace mongo