src/modules/extra/m_sqlite3.cpp

   1 /*               +------------------------------------+
   2  *               | Inspire Internet Relay Chat Daemon |
   3  *               +------------------------------------+
   4  *
   5  *      InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *                        the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include <sqlite3.h>
  16 #include "m_sqlv2.h"
  17
  18 /* $ModDesc: sqlite3 provider */
  19 /* $CompileFlags: pkgconfversion("sqlite3","3.3") pkgconfincludes("sqlite3","/sqlite3.h","") */
  20 /* $LinkerFlags: pkgconflibs("sqlite3","/libsqlite3.so","-lsqlite3") */
  21 /* $ModDep: m_sqlv2.h */
  22 /* $NoPedantic */
  23
  24 class SQLConn;
  25 class SQLite3Result;
  26 class ResultNotifier;
  27 class SQLiteListener;
  28 class ModuleSQLite3;
  29
  30 typedef std::map<std::string, SQLConn*> ConnMap;
  31 typedef std::deque<classbase*> paramlist;
  32 typedef std::deque<SQLite3Result*> ResultQueue;
  33
  34 unsigned long count(const char * const str, char a)
  35 {
  36         unsigned long n = 0;
  37         for (const char *p = str; *p; ++p)
  38         {
  39                 if (*p == '?')
  40                         ++n;
  41         }
  42         return n;
  43 }
  44
  45 ResultNotifier* notifier = NULL;
  46 SQLiteListener* listener = NULL;
  47 int QueueFD = -1;
  48
  49 class ResultNotifier : public BufferedSocket
  50 {
  51         ModuleSQLite3* mod;
  52
  53  public:
  54         ResultNotifier(ModuleSQLite3* m, InspIRCd* SI, int newfd, char* ip) : BufferedSocket(SI, newfd, ip), mod(m)
  55         {
  56         }
  57
  58         virtual bool OnDataReady()
  59         {
  60                 char data = 0;
  61                 if (ServerInstance->SE->Recv(this, &data, 1, 0) > 0)
  62                 {
  63                         Dispatch();
  64                         return true;
  65                 }
  66                 return false;
  67         }
  68
  69         void Dispatch();
  70 };
  71
  72 class SQLiteListener : public ListenSocketBase
  73 {
  74         ModuleSQLite3* Parent;
  75         irc::sockets::insp_sockaddr sock_us;
  76         socklen_t uslen;
  77         FileReader* index;
  78
  79  public:
  80         SQLiteListener(ModuleSQLite3* P, InspIRCd* Instance, int port, const std::string &addr) : ListenSocketBase(Instance, port, addr), Parent(P)
  81         {
  82                 uslen = sizeof(sock_us);
  83                 if (getsockname(this->fd,(sockaddr*)&sock_us,&uslen))
  84                 {
  85                         throw ModuleException("Could not getsockname() to find out port number for ITC port");
  86                 }
  87         }
  88
  89         virtual void OnAcceptReady(const std::string &ipconnectedto, int nfd, const std::string &incomingip)
  90         {
  91                 new ResultNotifier(this->Parent, this->ServerInstance, nfd, (char *)ipconnectedto.c_str()); // XXX unsafe casts suck
  92         }
  93
  94         /* Using getsockname and ntohs, we can determine which port number we were allocated */
  95         int GetPort()
  96         {
  97 #ifdef IPV6
  98                 return ntohs(sock_us.sin6_port);
  99 #else
 100                 return ntohs(sock_us.sin_port);
 101 #endif
 102         }
 103 };
 104
 105 class SQLite3Result : public SQLresult
 106 {
 107  private:
 108         int currentrow;
 109         int rows;
 110         int cols;
 111
 112         std::vector<std::string> colnames;
 113         std::vector<SQLfieldList> fieldlists;
 114         SQLfieldList emptyfieldlist;
 115
 116         SQLfieldList* fieldlist;
 117         SQLfieldMap* fieldmap;
 118
 119  public:
 120         SQLite3Result(Module* self, Module* to, unsigned int rid)
 121         : SQLresult(self, to, rid), currentrow(0), rows(0), cols(0), fieldlist(NULL), fieldmap(NULL)
 122         {
 123         }
 124
 125         ~SQLite3Result()
 126         {
 127         }
 128
 129         void AddRow(int colsnum, char **dat, char **colname)
 130         {
 131                 colnames.clear();
 132                 cols = colsnum;
 133                 for (int i = 0; i < colsnum; i++)
 134                 {
 135                         fieldlists.resize(fieldlists.size()+1);
 136                         colnames.push_back(colname[i]);
 137                         SQLfield sf(dat[i] ? dat[i] : "", dat[i] ? false : true);
 138                         fieldlists[rows].push_back(sf);
 139                 }
 140                 rows++;
 141         }
 142
 143         void UpdateAffectedCount()
 144         {
 145                 rows++;
 146         }
 147
 148         virtual int Rows()
 149         {
 150                 return rows;
 151         }
 152
 153         virtual int Cols()
 154         {
 155                 return cols;
 156         }
 157
 158         virtual std::string ColName(int column)
 159         {
 160                 if (column < (int)colnames.size())
 161                 {
 162                         return colnames[column];
 163                 }
 164                 else
 165                 {
 166                         throw SQLbadColName();
 167                 }
 168                 return "";
 169         }
 170
 171         virtual int ColNum(const std::string &column)
 172         {
 173                 for (unsigned int i = 0; i < colnames.size(); i++)
 174                 {
 175                         if (column == colnames[i])
 176                                 return i;
 177                 }
 178                 throw SQLbadColName();
 179                 return 0;
 180         }
 181
 182         virtual SQLfield GetValue(int row, int column)
 183         {
 184                 if ((row >= 0) && (row < rows) && (column >= 0) && (column < Cols()))
 185                 {
 186                         return fieldlists[row][column];
 187                 }
 188
 189                 throw SQLbadColName();
 190
 191                 /* XXX: We never actually get here because of the throw */
 192                 return SQLfield("",true);
 193         }
 194
 195         virtual SQLfieldList& GetRow()
 196         {
 197                 if (currentrow < rows)
 198                         return fieldlists[currentrow];
 199                 else
 200                         return emptyfieldlist;
 201         }
 202
 203         virtual SQLfieldMap& GetRowMap()
 204         {
 205                 /* In an effort to reduce overhead we don't actually allocate the map
 206                  * until the first time it's needed...so...
 207                  */
 208                 if(fieldmap)
 209                 {
 210                         fieldmap->clear();
 211                 }
 212                 else
 213                 {
 214                         fieldmap = new SQLfieldMap;
 215                 }
 216
 217                 if (currentrow < rows)
 218                 {
 219                         for (int i = 0; i < Cols(); i++)
 220                         {
 221                                 fieldmap->insert(std::make_pair(ColName(i), GetValue(currentrow, i)));
 222                         }
 223                         currentrow++;
 224                 }
 225
 226                 return *fieldmap;
 227         }
 228
 229         virtual SQLfieldList* GetRowPtr()
 230         {
 231                 fieldlist = new SQLfieldList();
 232
 233                 if (currentrow < rows)
 234                 {
 235                         for (int i = 0; i < Rows(); i++)
 236                         {
 237                                 fieldlist->push_back(fieldlists[currentrow][i]);
 238                         }
 239                         currentrow++;
 240                 }
 241                 return fieldlist;
 242         }
 243
 244         virtual SQLfieldMap* GetRowMapPtr()
 245         {
 246                 fieldmap = new SQLfieldMap();
 247
 248                 if (currentrow < rows)
 249                 {
 250                         for (int i = 0; i < Cols(); i++)
 251                         {
 252                                 fieldmap->insert(std::make_pair(colnames[i],GetValue(currentrow, i)));
 253                         }
 254                         currentrow++;
 255                 }
 256
 257                 return fieldmap;
 258         }
 259
 260         virtual void Free(SQLfieldMap* fm)
 261         {
 262                 delete fm;
 263         }
 264
 265         virtual void Free(SQLfieldList* fl)
 266         {
 267                 delete fl;
 268         }
 269
 270
 271 };
 272
 273 class SQLConn : public classbase
 274 {
 275  private:
 276         ResultQueue results;
 277         InspIRCd* ServerInstance;
 278         Module* mod;
 279         SQLhost host;
 280         sqlite3* conn;
 281
 282  public:
 283         SQLConn(InspIRCd* SI, Module* m, const SQLhost& hi)
 284         : ServerInstance(SI), mod(m), host(hi)
 285         {
 286                 if (OpenDB() != SQLITE_OK)
 287                 {
 288                         ServerInstance->Logs->Log("m_sqlite3",DEFAULT, "WARNING: Could not open DB with id: " + host.id);
 289                         CloseDB();
 290                 }
 291         }
 292
 293         ~SQLConn()
 294         {
 295                 CloseDB();
 296         }
 297
 298         SQLerror Query(SQLrequest &req)
 299         {
 300                 /* Pointer to the buffer we screw around with substitution in */
 301                 char* query;
 302
 303                 /* Pointer to the current end of query, where we append new stuff */
 304                 char* queryend;
 305
 306                 /* Total length of the unescaped parameters */
 307                 unsigned long maxparamlen, paramcount;
 308
 309                 /* The length of the longest parameter */
 310                 maxparamlen = 0;
 311
 312                 for(ParamL::iterator i = req.query.p.begin(); i != req.query.p.end(); i++)
 313                 {
 314                         if (i->size() > maxparamlen)
 315                                 maxparamlen = i->size();
 316                 }
 317
 318                 /* How many params are there in the query? */
 319                 paramcount = count(req.query.q.c_str(), '?');
 320
 321                 /* This stores copy of params to be inserted with using numbered params 1;3B*/
 322                 ParamL paramscopy(req.query.p);
 323
 324                 /* To avoid a lot of allocations, allocate enough memory for the biggest the escaped query could possibly be.
 325                  * sizeofquery + (maxtotalparamlength*2) + 1
 326                  *
 327                  * The +1 is for null-terminating the string
 328                  */
 329
 330                 query = new char[req.query.q.length() + (maxparamlen*paramcount*2) + 1];
 331                 queryend = query;
 332
 333                 for(unsigned long i = 0; i < req.query.q.length(); i++)
 334                 {
 335                         if(req.query.q[i] == '?')
 336                         {
 337                                 /* We found a place to substitute..what fun.
 338                                  * use sqlite calls to escape and write the
 339                                  * escaped string onto the end of our query buffer,
 340                                  * then we "just" need to make sure queryend is
 341                                  * pointing at the right place.
 342                                  */
 343
 344                                 /* Is it numbered parameter?
 345                                  */
 346
 347                                 bool numbered;
 348                                 numbered = false;
 349
 350                                 /* Numbered parameter number :|
 351                                  */
 352                                 unsigned int paramnum;
 353                                 paramnum = 0;
 354
 355                                 /* Let's check if it's a numbered param. And also calculate it's number.
 356                                  */
 357
 358                                 while ((i < req.query.q.length() - 1) && (req.query.q[i+1] >= '0') && (req.query.q[i+1] <= '9'))
 359                                 {
 360                                         numbered = true;
 361                                         ++i;
 362                                         paramnum = paramnum * 10 + req.query.q[i] - '0';
 363                                 }
 364
 365                                 if (paramnum > paramscopy.size() - 1)
 366                                 {
 367                                         /* index is out of range!
 368                                          */
 369                                         numbered = false;
 370                                 }
 371
 372
 373                                 if (numbered)
 374                                 {
 375                                         char* escaped;
 376                                         escaped = sqlite3_mprintf("%q", paramscopy[paramnum].c_str());
 377                                         for (char* n = escaped; *n; n++)
 378                                         {
 379                                                 *queryend = *n;
 380                                                 queryend++;
 381                                         }
 382                                         sqlite3_free(escaped);
 383                                 }
 384                                 else if (req.query.p.size())
 385                                 {
 386                                         char* escaped;
 387                                         escaped = sqlite3_mprintf("%q", req.query.p.front().c_str());
 388                                         for (char* n = escaped; *n; n++)
 389                                         {
 390                                                 *queryend = *n;
 391                                                 queryend++;
 392                                         }
 393                                         sqlite3_free(escaped);
 394                                         req.query.p.pop_front();
 395                                 }
 396                                 else
 397                                         break;
 398                         }
 399                         else
 400                         {
 401                                 *queryend = req.query.q[i];
 402                                 queryend++;
 403                         }
 404                 }
 405                 *queryend = 0;
 406                 req.query.q = query;
 407
 408                 SQLite3Result* res = new SQLite3Result(mod, req.GetSource(), req.id);
 409                 res->dbid = host.id;
 410                 res->query = req.query.q;
 411                 paramlist params;
 412                 params.push_back(this);
 413                 params.push_back(res);
 414
 415                 char *errmsg = 0;
 416                 sqlite3_update_hook(conn, QueryUpdateHook, &params);
 417                 if (sqlite3_exec(conn, req.query.q.data(), QueryResult, &params, &errmsg) != SQLITE_OK)
 418                 {
 419                         std::string error(errmsg);
 420                         sqlite3_free(errmsg);
 421                         delete[] query;
 422                         delete res;
 423                         return SQLerror(SQL_QSEND_FAIL, error);
 424                 }
 425                 delete[] query;
 426
 427                 results.push_back(res);
 428                 SendNotify();
 429                 return SQLerror();
 430         }
 431
 432         static int QueryResult(void *params, int argc, char **argv, char **azColName)
 433         {
 434                 paramlist* p = (paramlist*)params;
 435                 ((SQLConn*)(*p)[0])->ResultReady(((SQLite3Result*)(*p)[1]), argc, argv, azColName);
 436                 return 0;
 437         }
 438
 439         static void QueryUpdateHook(void *params, int eventid, char const * azSQLite, char const * azColName, sqlite_int64 rowid)
 440         {
 441                 paramlist* p = (paramlist*)params;
 442                 ((SQLConn*)(*p)[0])->AffectedReady(((SQLite3Result*)(*p)[1]));
 443         }
 444
 445         void ResultReady(SQLite3Result *res, int cols, char **data, char **colnames)
 446         {
 447                 res->AddRow(cols, data, colnames);
 448         }
 449
 450         void AffectedReady(SQLite3Result *res)
 451         {
 452                 res->UpdateAffectedCount();
 453         }
 454
 455         int OpenDB()
 456         {
 457                 return sqlite3_open_v2(host.host.c_str(), &conn, SQLITE_OPEN_READWRITE, 0);
 458         }
 459
 460         void CloseDB()
 461         {
 462                 sqlite3_interrupt(conn);
 463                 sqlite3_close(conn);
 464         }
 465
 466         SQLhost GetConfHost()
 467         {
 468                 return host;
 469         }
 470
 471         void SendResults()
 472         {
 473                 while (results.size())
 474                 {
 475                         SQLite3Result* res = results[0];
 476                         if (res->GetDest())
 477                         {
 478                                 res->Send();
 479                         }
 480                         else
 481                         {
 482                                 /* If the client module is unloaded partway through a query then the provider will set
 483                                  * the pointer to NULL. We cannot just cancel the query as the result will still come
 484                                  * through at some point...and it could get messy if we play with invalid pointers...
 485                                  */
 486                                 delete res;
 487                         }
 488                         results.pop_front();
 489                 }
 490         }
 491
 492         void ClearResults()
 493         {
 494                 while (results.size())
 495                 {
 496                         SQLite3Result* res = results[0];
 497                         delete res;
 498                         results.pop_front();
 499                 }
 500         }
 501
 502         void SendNotify()
 503         {
 504                 if (QueueFD < 0)
 505                 {
 506                         if ((QueueFD = socket(AF_FAMILY, SOCK_STREAM, 0)) == -1)
 507                         {
 508                                 /* crap, we're out of sockets... */
 509                                 return;
 510                         }
 511
 512                         irc::sockets::insp_sockaddr addr;
 513
 514 #ifdef IPV6
 515                         irc::sockets::insp_aton("::1", &addr.sin6_addr);
 516                         addr.sin6_family = AF_FAMILY;
 517                         addr.sin6_port = htons(listener->GetPort());
 518 #else
 519                         irc::sockets::insp_inaddr ia;
 520                         irc::sockets::insp_aton("127.0.0.1", &ia);
 521                         addr.sin_family = AF_FAMILY;
 522                         addr.sin_addr = ia;
 523                         addr.sin_port = htons(listener->GetPort());
 524 #endif
 525
 526                         if (connect(QueueFD, (sockaddr*)&addr,sizeof(addr)) == -1)
 527                         {
 528                                 /* wtf, we cant connect to it, but we just created it! */
 529                                 return;
 530                         }
 531                 }
 532                 char id = 0;
 533                 send(QueueFD, &id, 1, 0);
 534         }
 535
 536 };
 537
 538
 539 class ModuleSQLite3 : public Module
 540 {
 541  private:
 542         ConnMap connections;
 543         unsigned long currid;
 544
 545  public:
 546         ModuleSQLite3(InspIRCd* Me)
 547         : Module(Me), currid(0)
 548         {
 549                 ServerInstance->Modules->UseInterface("SQLutils");
 550
 551                 if (!ServerInstance->Modules->PublishFeature("SQL", this))
 552                 {
 553                         throw ModuleException("m_sqlite3: Unable to publish feature 'SQL'");
 554                 }
 555
 556                 /* Create a socket on a random port. Let the tcp stack allocate us an available port */
 557 #ifdef IPV6
 558                 listener = new SQLiteListener(this, ServerInstance, 0, "::1");
 559 #else
 560                 listener = new SQLiteListener(this, ServerInstance, 0, "127.0.0.1");
 561 #endif
 562
 563                 if (listener->GetFd() == -1)
 564                 {
 565                         ServerInstance->Modules->DoneWithInterface("SQLutils");
 566                         throw ModuleException("m_sqlite3: unable to create ITC pipe");
 567                 }
 568                 else
 569                 {
 570                         ServerInstance->Logs->Log("m_sqlite3", DEBUG, "SQLite: Interthread comms port is %d", listener->GetPort());
 571                 }
 572
 573                 ReadConf();
 574
 575                 ServerInstance->Modules->PublishInterface("SQL", this);
 576                 Implementation eventlist[] = { I_OnRequest, I_OnRehash };
 577                 ServerInstance->Modules->Attach(eventlist, this, 2);
 578         }
 579
 580         virtual ~ModuleSQLite3()
 581         {
 582                 ClearQueue();
 583                 ClearAllConnections();
 584
 585                 ServerInstance->SE->DelFd(listener);
 586                 ServerInstance->BufferedSocketCull();
 587
 588                 if (QueueFD >= 0)
 589                 {
 590                         shutdown(QueueFD, 2);
 591                         close(QueueFD);
 592                 }
 593
 594                 if (notifier)
 595                 {
 596                         ServerInstance->SE->DelFd(notifier);
 597                         notifier->Close();
 598                         ServerInstance->BufferedSocketCull();
 599                 }
 600
 601                 ServerInstance->Modules->UnpublishInterface("SQL", this);
 602                 ServerInstance->Modules->UnpublishFeature("SQL");
 603                 ServerInstance->Modules->DoneWithInterface("SQLutils");
 604         }
 605
 606
 607         void SendQueue()
 608         {
 609                 for (ConnMap::iterator iter = connections.begin(); iter != connections.end(); iter++)
 610                 {
 611                         iter->second->SendResults();
 612                 }
 613         }
 614
 615         void ClearQueue()
 616         {
 617                 for (ConnMap::iterator iter = connections.begin(); iter != connections.end(); iter++)
 618                 {
 619                         iter->second->ClearResults();
 620                 }
 621         }
 622
 623         bool HasHost(const SQLhost &host)
 624         {
 625                 for (ConnMap::iterator iter = connections.begin(); iter != connections.end(); iter++)
 626                 {
 627                         if (host == iter->second->GetConfHost())
 628                                 return true;
 629                 }
 630                 return false;
 631         }
 632
 633         bool HostInConf(const SQLhost &h)
 634         {
 635                 ConfigReader conf(ServerInstance);
 636                 for(int i = 0; i < conf.Enumerate("database"); i++)
 637                 {
 638                         SQLhost host;
 639                         host.id         = conf.ReadValue("database", "id", i);
 640                         host.host       = conf.ReadValue("database", "hostname", i);
 641                         host.port       = conf.ReadInteger("database", "port", i, true);
 642                         host.name       = conf.ReadValue("database", "name", i);
 643                         host.user       = conf.ReadValue("database", "username", i);
 644                         host.pass       = conf.ReadValue("database", "password", i);
 645                         if (h == host)
 646                                 return true;
 647                 }
 648                 return false;
 649         }
 650
 651         void ReadConf()
 652         {
 653                 ClearOldConnections();
 654
 655                 ConfigReader conf(ServerInstance);
 656                 for(int i = 0; i < conf.Enumerate("database"); i++)
 657                 {
 658                         SQLhost host;
 659
 660                         host.id         = conf.ReadValue("database", "id", i);
 661                         host.host       = conf.ReadValue("database", "hostname", i);
 662                         host.port       = conf.ReadInteger("database", "port", i, true);
 663                         host.name       = conf.ReadValue("database", "name", i);
 664                         host.user       = conf.ReadValue("database", "username", i);
 665                         host.pass       = conf.ReadValue("database", "password", i);
 666
 667                         if (HasHost(host))
 668                                 continue;
 669
 670                         this->AddConn(host);
 671                 }
 672         }
 673
 674         void AddConn(const SQLhost& hi)
 675         {
 676                 if (HasHost(hi))
 677                 {
 678                         ServerInstance->Logs->Log("m_sqlite3",DEFAULT, "WARNING: A sqlite connection with id: %s already exists. Aborting database open attempt.", hi.id.c_str());
 679                         return;
 680                 }
 681
 682                 SQLConn* newconn;
 683
 684                 newconn = new SQLConn(ServerInstance, this, hi);
 685
 686                 connections.insert(std::make_pair(hi.id, newconn));
 687         }
 688
 689         void ClearOldConnections()
 690         {
 691                 ConnMap::iterator iter,safei;
 692                 for (iter = connections.begin(); iter != connections.end(); iter++)
 693                 {
 694                         if (!HostInConf(iter->second->GetConfHost()))
 695                         {
 696                                 delete iter->second;
 697                                 safei = iter;
 698                                 --iter;
 699                                 connections.erase(safei);
 700                         }
 701                 }
 702         }
 703
 704         void ClearAllConnections()
 705         {
 706                 ConnMap::iterator i;
 707                 while ((i = connections.begin()) != connections.end())
 708                 {
 709                         connections.erase(i);
 710                         delete i->second;
 711                 }
 712         }
 713
 714         virtual void OnRehash(User* user)
 715         {
 716                 ReadConf();
 717         }
 718
 719         virtual const char* OnRequest(Request* request)
 720         {
 721                 if(strcmp(SQLREQID, request->GetId()) == 0)
 722                 {
 723                         SQLrequest* req = (SQLrequest*)request;
 724                         ConnMap::iterator iter;
 725                         if((iter = connections.find(req->dbid)) != connections.end())
 726                         {
 727                                 req->id = NewID();
 728                                 req->error = iter->second->Query(*req);
 729                                 return SQLSUCCESS;
 730                         }
 731                         else
 732                         {
 733                                 req->error.Id(SQL_BAD_DBID);
 734                                 return NULL;
 735                         }
 736                 }
 737                 return NULL;
 738         }
 739
 740         unsigned long NewID()
 741         {
 742                 if (currid+1 == 0)
 743                         currid++;
 744
 745                 return ++currid;
 746         }
 747
 748         virtual Version GetVersion()
 749         {
 750                 return Version("sqlite3 provider", VF_VENDOR | VF_SERVICEPROVIDER, API_VERSION);
 751         }
 752
 753 };
 754
 755 void ResultNotifier::Dispatch()
 756 {
 757         mod->SendQueue();
 758 }
 759
 760 MODULE_INIT(ModuleSQLite3)