citadel/serv_extensions.c

   1 /*
   2  * $Id$
   3  *
   4  * Citadel Dynamic Loading Module
   5  * Written by Brian Costello <btx@calyx.net>
   6  *
   7  */
   8
   9 #include "sysdep.h"
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <sys/types.h>
  14 #include <dirent.h>
  15 #include <string.h>
  16 #include <limits.h>
  17 #include <ctype.h>
  18 #include <libcitadel.h>
  19 #include "citadel.h"
  20 #include "server.h"
  21 #include "serv_extensions.h"
  22 #include "sysdep_decls.h"
  23 #include "msgbase.h"
  24 #include "config.h"
  25
  26 #include "modules/crypto/serv_crypto.h" /* Needed until a universal crypto startup hook is implimented for CtdlStartTLS */
  27
  28 #include "ctdl_module.h"
  29
  30 #ifndef HAVE_SNPRINTF
  31 #include <stdarg.h>
  32 #include "snprintf.h"
  33 #endif
  34
  35 struct CleanupFunctionHook *CleanupHookTable = NULL;
  36 struct SessionFunctionHook *SessionHookTable = NULL;
  37 struct UserFunctionHook *UserHookTable = NULL;
  38 struct XmsgFunctionHook *XmsgHookTable = NULL;
  39 struct MessageFunctionHook *MessageHookTable = NULL;
  40 struct NetprocFunctionHook *NetprocHookTable = NULL;
  41 struct DeleteFunctionHook *DeleteHookTable = NULL;
  42 struct ServiceFunctionHook *ServiceHookTable = NULL;
  43 struct FixedOutputHook *FixedOutputTable = NULL;
  44 struct RoomFunctionHook *RoomHookTable = NULL;
  45 struct SearchFunctionHook *SearchFunctionHookTable = NULL;
  46
  47 struct ProtoFunctionHook {
  48         void (*handler) (char *cmdbuf);
  49         char *cmd;
  50         char *desc;
  51         struct ProtoFunctionHook *next;
  52 } *ProtoHookList = NULL;
  53
  54
  55 struct DirectoryServiceHook {
  56         int (*handler) (char *cn, char *ou, void **object);
  57         int cmd;
  58         char *module;
  59         struct DirectoryServiceHook *next;
  60 } *DirectoryServiceHookList = NULL;
  61
  62 struct DirectoryObject {
  63         char *module;
  64         void *object;
  65         struct DirectoryObject *next;
  66 };
  67
  68 #define ERR_PORT (1 << 1)
  69
  70
  71 static char *portlist = NULL;
  72 static size_t nSizPort = 0;
  73
  74 static char *errormessages = NULL;
  75 size_t nSizErrmsg = 0;
  76
  77
  78 long   DetailErrorFlags;
  79
  80 char *ErrSubject = "Startup Problems";
  81 char *ErrGeneral = "Citadel had trouble on starting up. %s This means, citadel won't be the service provider for a specific service you configured it to.\n\n"
  82 "If you don't want citadel to provide these services, turn them off in WebCit via %s%s\n\n%s\n\n"
  83 "To make both ways actualy take place restart the citserver with \"sendcommand down\"\n\n"
  84 "The errors returned by the system were:\n%s\n"
  85 "You can recheck the above if you follow this faq item:\n"
  86 "http://www.citadel.org/doku.php/faq:mastering_your_os:net#netstat";
  87
  88
  89 char *ErrPortShort = "We couldn't bind all ports you configured to be provided by citadel server.";
  90 char *ErrPortWhere = "Admin->System Preferences->Network.\n\nThe failed ports and sockets are: ";
  91 char *ErrPortHint = "If you want citadel to provide you with that functionality, "
  92 "check the output of \"netstat -lnp\" on linux Servers or \"netstat -na\" on *BSD"
  93 " and stop the programm, that binds these ports. You should eventually remove "
  94 " their initscripts in /etc/init.d so that you won't get this trouble once more.\n"
  95 " After that goto Administration -> Shutdown Citadel to make Citadel retry to bind this port.\n";
  96
  97
  98 void LogPrintMessages(long err)
  99 {
 100         char *List, *DetailList, *Short, *Where, *Hint, *Message;
 101         int n = nSizPort + nSizErrmsg + 5;
 102
 103         Message = (char*) malloc(n * SIZ);
 104
 105         switch (err)
 106         {
 107         case ERR_PORT:
 108                 Short = ErrPortShort;
 109                 Where = ErrPortWhere;
 110                 Hint  = ErrPortHint;
 111                 List  = portlist;
 112                 DetailList = errormessages;
 113                 break;
 114         default:
 115                 Short = "";
 116                 Where = "";
 117                 Hint  = "";
 118                 List  = "";
 119                 DetailList = "";
 120         }
 121
 122
 123         snprintf(Message, n * SIZ, ErrGeneral, Short, Where, List, Hint, DetailList);
 124
 125         CtdlLogPrintf(0,Message);
 126         CtdlLogPrintf(0,ErrSubject);
 127         quickie_message("Citadel", NULL, NULL, AIDEROOM, Message, FMT_FIXED, ErrSubject);
 128         if (errormessages!=NULL) free (errormessages);
 129         errormessages = NULL;
 130         if (portlist!=NULL) free (portlist);
 131         portlist = NULL;
 132         free(Message);
 133 }
 134
 135
 136
 137 void AppendString(char **target, char *append, size_t *len, size_t rate)
 138 {
 139         size_t oLen = 0;
 140         long AddLen;
 141         long RelPtr = 0;
 142
 143         AddLen = strlen(append);
 144
 145         if (*len == 0)
 146         {
 147                 *len = rate;
 148
 149                 *target = (char*)malloc (*len * SIZ);
 150         }
 151         else
 152         {
 153                 oLen = strlen(*target);
 154                 RelPtr = strlen(*target);
 155                 if (oLen + AddLen + 2 > *len * SIZ)
 156                 {
 157                         char *Buff = *target;
 158                         size_t NewSiz = *len + 10;
 159                         *target = malloc (NewSiz * SIZ);
 160                         memcpy (*target, Buff, NewSiz * SIZ);
 161                         *len = NewSiz;
 162                 }
 163         }
 164         memcpy (*target + oLen, append, AddLen);
 165         (*target)[oLen + AddLen + 1] = '\n';
 166         (*target)[oLen + AddLen + 2] = '\0';
 167 }
 168
 169 void AddPortError(char *Port, char *ErrorMessage)
 170 {
 171         char *pos;
 172         long len;
 173
 174         DetailErrorFlags |= ERR_PORT;
 175
 176         AppendString(&errormessages, ErrorMessage, &nSizErrmsg, 10);
 177         AppendString(&portlist, Port, &nSizPort, 2);
 178
 179         pos = strchr (portlist, ':');
 180         if (pos != NULL) *pos = ';';
 181
 182         len = strlen (errormessages);
 183         if (nSizErrmsg * SIZ > len + 3)
 184         {
 185                 errormessages[len] = ';';
 186                 errormessages[len+1] = ' ';
 187                 errormessages[len+2] = '\0';
 188         }
 189 }
 190
 191
 192 int DLoader_Exec_Cmd(char *cmdbuf)
 193 {
 194         struct ProtoFunctionHook *p;
 195
 196         for (p = ProtoHookList; p; p = p->next) {
 197                 if (!strncasecmp(cmdbuf, p->cmd, 4)) {
 198                         p->handler(&cmdbuf[5]);
 199                         return 1;
 200                 }
 201         }
 202         return 0;
 203 }
 204
 205
 206 void CtdlRegisterProtoHook(void (*handler) (char *), char *cmd, char *desc)
 207 {
 208         struct ProtoFunctionHook *p;
 209
 210         p = (struct ProtoFunctionHook *)
 211                 malloc(sizeof(struct ProtoFunctionHook));
 212
 213         if (p == NULL) {
 214                 fprintf(stderr, "can't malloc new ProtoFunctionHook\n");
 215                 exit(EXIT_FAILURE);
 216         }
 217         p->handler = handler;
 218         p->cmd = cmd;
 219         p->desc = desc;
 220         p->next = ProtoHookList;
 221         ProtoHookList = p;
 222         CtdlLogPrintf(CTDL_INFO, "Registered server command %s (%s)\n", cmd, desc);
 223 }
 224
 225
 226 void CtdlUnregisterProtoHook(void (*handler) (char *), char *cmd)
 227 {
 228         struct ProtoFunctionHook *cur = NULL;
 229         struct ProtoFunctionHook *p = NULL;
 230         struct ProtoFunctionHook *lastcur = NULL;
 231
 232         for (cur = ProtoHookList;
 233              cur != NULL;
 234              cur = (cur != NULL)? cur->next: NULL) {
 235                 /* This will also remove duplicates if any */
 236                 while (cur != NULL &&
 237                                 handler == cur->handler &&
 238                                 !strcmp(cmd, cur->cmd)) {
 239                         CtdlLogPrintf(CTDL_INFO, "Unregistered server command %s (%s)\n",
 240                                         cmd, cur->desc);
 241                         p = cur->next;
 242                         if (cur == ProtoHookList) {
 243                                 ProtoHookList = p;
 244                         }
 245                         else if (lastcur != NULL)
 246                         {
 247                                 lastcur->next = p;
 248                         }
 249                         free(cur);
 250                         cur = p;
 251                 }
 252                 lastcur = cur;
 253         }
 254 }
 255
 256 void CtdlDestroyProtoHooks(void)
 257 {
 258         struct ProtoFunctionHook *cur, *p;
 259
 260         cur = ProtoHookList;
 261         while (cur != NULL)
 262         {
 263                 CtdlLogPrintf(CTDL_INFO, "Destroyed server command %s (%s)\n",
 264                         cur->cmd, cur->desc);
 265                 p = cur->next;
 266                 free(cur);
 267                 cur = p;
 268         }
 269         ProtoHookList = NULL;
 270 }
 271
 272
 273 void CtdlRegisterCleanupHook(void (*fcn_ptr) (void))
 274 {
 275
 276         struct CleanupFunctionHook *newfcn;
 277
 278         newfcn = (struct CleanupFunctionHook *)
 279             malloc(sizeof(struct CleanupFunctionHook));
 280         newfcn->next = CleanupHookTable;
 281         newfcn->h_function_pointer = fcn_ptr;
 282         CleanupHookTable = newfcn;
 283
 284         CtdlLogPrintf(CTDL_INFO, "Registered a new cleanup function\n");
 285 }
 286
 287
 288 void CtdlUnregisterCleanupHook(void (*fcn_ptr) (void))
 289 {
 290         struct CleanupFunctionHook *cur, *p;
 291
 292         for (cur = CleanupHookTable; cur != NULL; cur = cur->next) {
 293                 /* This will also remove duplicates if any */
 294                 while (cur != NULL &&
 295                                 fcn_ptr == cur->h_function_pointer) {
 296                         CtdlLogPrintf(CTDL_INFO, "Unregistered cleanup function\n");
 297                         p = cur->next;
 298                         if (cur == CleanupHookTable) {
 299                                 CleanupHookTable = p;
 300                         }
 301                         free(cur);
 302                         cur = p;
 303                 }
 304         }
 305 }
 306
 307 void CtdlDestroyCleanupHooks(void)
 308 {
 309         struct CleanupFunctionHook *cur, *p;
 310
 311         cur = CleanupHookTable;
 312         while (cur != NULL)
 313         {
 314                 CtdlLogPrintf(CTDL_INFO, "Destroyed cleanup function\n");
 315                 p = cur->next;
 316                 free(cur);
 317                 cur = p;
 318         }
 319         CleanupHookTable = NULL;
 320 }
 321
 322
 323 void CtdlRegisterSessionHook(void (*fcn_ptr) (void), int EventType)
 324 {
 325
 326         struct SessionFunctionHook *newfcn;
 327
 328         newfcn = (struct SessionFunctionHook *)
 329             malloc(sizeof(struct SessionFunctionHook));
 330         newfcn->next = SessionHookTable;
 331         newfcn->h_function_pointer = fcn_ptr;
 332         newfcn->eventtype = EventType;
 333         SessionHookTable = newfcn;
 334
 335         CtdlLogPrintf(CTDL_INFO, "Registered a new session function (type %d)\n",
 336                 EventType);
 337 }
 338
 339
 340 void CtdlUnregisterSessionHook(void (*fcn_ptr) (void), int EventType)
 341 {
 342         struct SessionFunctionHook *cur, *p;
 343
 344         for (cur = SessionHookTable; cur != NULL; cur = cur->next) {
 345                 /* This will also remove duplicates if any */
 346                 while (cur != NULL &&
 347                                 fcn_ptr == cur->h_function_pointer &&
 348                                 EventType == cur->eventtype) {
 349                         CtdlLogPrintf(CTDL_INFO, "Unregistered session function (type %d)\n",
 350                                         EventType);
 351                         p = cur->next;
 352                         if (cur == SessionHookTable) {
 353                                 SessionHookTable = p;
 354                         }
 355                         free(cur);
 356                         cur = p;
 357                 }
 358         }
 359 }
 360
 361 void CtdlDestroySessionHooks(void)
 362 {
 363         struct SessionFunctionHook *cur, *p;
 364
 365         cur = SessionHookTable;
 366         while (cur != NULL)
 367         {
 368                 CtdlLogPrintf(CTDL_INFO, "Destroyed session function\n");
 369                 p = cur->next;
 370                 free(cur);
 371                 cur = p;
 372         }
 373         SessionHookTable = NULL;
 374 }
 375
 376
 377 void CtdlRegisterUserHook(void (*fcn_ptr) (struct ctdluser *), int EventType)
 378 {
 379
 380         struct UserFunctionHook *newfcn;
 381
 382         newfcn = (struct UserFunctionHook *)
 383             malloc(sizeof(struct UserFunctionHook));
 384         newfcn->next = UserHookTable;
 385         newfcn->h_function_pointer = fcn_ptr;
 386         newfcn->eventtype = EventType;
 387         UserHookTable = newfcn;
 388
 389         CtdlLogPrintf(CTDL_INFO, "Registered a new user function (type %d)\n",
 390                 EventType);
 391 }
 392
 393
 394 void CtdlUnregisterUserHook(void (*fcn_ptr) (struct ctdluser *), int EventType)
 395 {
 396         struct UserFunctionHook *cur, *p;
 397
 398         for (cur = UserHookTable; cur != NULL; cur = cur->next) {
 399                 /* This will also remove duplicates if any */
 400                 while (cur != NULL &&
 401                                 fcn_ptr == cur->h_function_pointer &&
 402                                 EventType == cur->eventtype) {
 403                         CtdlLogPrintf(CTDL_INFO, "Unregistered user function (type %d)\n",
 404                                         EventType);
 405                         p = cur->next;
 406                         if (cur == UserHookTable) {
 407                                 UserHookTable = p;
 408                         }
 409                         free(cur);
 410                         cur = p;
 411                 }
 412         }
 413 }
 414
 415 void CtdlDestroyUserHooks(void)
 416 {
 417         struct UserFunctionHook *cur, *p;
 418
 419         cur = UserHookTable;
 420         while (cur != NULL)
 421         {
 422                 CtdlLogPrintf(CTDL_INFO, "Destroyed user function \n");
 423                 p = cur->next;
 424                 free(cur);
 425                 cur = p;
 426         }
 427         UserHookTable = NULL;
 428 }
 429
 430
 431 void CtdlRegisterMessageHook(int (*handler)(struct CtdlMessage *),
 432                                 int EventType)
 433 {
 434
 435         struct MessageFunctionHook *newfcn;
 436
 437         newfcn = (struct MessageFunctionHook *)
 438             malloc(sizeof(struct MessageFunctionHook));
 439         newfcn->next = MessageHookTable;
 440         newfcn->h_function_pointer = handler;
 441         newfcn->eventtype = EventType;
 442         MessageHookTable = newfcn;
 443
 444         CtdlLogPrintf(CTDL_INFO, "Registered a new message function (type %d)\n",
 445                 EventType);
 446 }
 447
 448
 449 void CtdlUnregisterMessageHook(int (*handler)(struct CtdlMessage *),
 450                 int EventType)
 451 {
 452         struct MessageFunctionHook *cur, *p;
 453
 454         for (cur = MessageHookTable; cur != NULL; cur = cur->next) {
 455                 /* This will also remove duplicates if any */
 456                 while (cur != NULL &&
 457                                 handler == cur->h_function_pointer &&
 458                                 EventType == cur->eventtype) {
 459                         CtdlLogPrintf(CTDL_INFO, "Unregistered message function (type %d)\n",
 460                                         EventType);
 461                         p = cur->next;
 462                         if (cur == MessageHookTable) {
 463                                 MessageHookTable = p;
 464                         }
 465                         free(cur);
 466                         cur = p;
 467                 }
 468         }
 469 }
 470
 471 void CtdlDestroyMessageHook(void)
 472 {
 473         struct MessageFunctionHook *cur, *p;
 474
 475         cur = MessageHookTable;
 476         while (cur != NULL)
 477         {
 478                 CtdlLogPrintf(CTDL_INFO, "Destroyed message function \n");
 479                 p = cur->next;
 480                 free(cur);
 481                 cur = p;
 482         }
 483         MessageHookTable = NULL;
 484 }
 485
 486
 487 void CtdlRegisterRoomHook(int (*fcn_ptr)(struct ctdlroom *))
 488 {
 489         struct RoomFunctionHook *newfcn;
 490
 491         newfcn = (struct RoomFunctionHook *)
 492             malloc(sizeof(struct RoomFunctionHook));
 493         newfcn->next = RoomHookTable;
 494         newfcn->fcn_ptr = fcn_ptr;
 495         RoomHookTable = newfcn;
 496
 497         CtdlLogPrintf(CTDL_INFO, "Registered a new room function\n");
 498 }
 499
 500
 501 void CtdlUnregisterRoomHook(int (*fcn_ptr)(struct ctdlroom *))
 502 {
 503         struct RoomFunctionHook *cur, *p;
 504
 505         for (cur = RoomHookTable; cur != NULL; cur = cur->next) {
 506                 while (cur != NULL && fcn_ptr == cur->fcn_ptr) {
 507                         CtdlLogPrintf(CTDL_INFO, "Unregistered room function\n");
 508                         p = cur->next;
 509                         if (cur == RoomHookTable) {
 510                                 RoomHookTable = p;
 511                         }
 512                         free(cur);
 513                         cur = p;
 514                 }
 515         }
 516 }
 517
 518
 519 void CtdlDestroyRoomHooks(void)
 520 {
 521         struct RoomFunctionHook *cur, *p;
 522
 523         cur = RoomHookTable;
 524         while (cur != NULL)
 525         {
 526                 CtdlLogPrintf(CTDL_INFO, "Unregistered room function\n");
 527                 p = cur->next;
 528                 free(cur);
 529                 cur = p;
 530         }
 531         RoomHookTable = NULL;
 532 }
 533
 534 void CtdlRegisterNetprocHook(int (*handler)(struct CtdlMessage *, char *) )
 535 {
 536         struct NetprocFunctionHook *newfcn;
 537
 538         newfcn = (struct NetprocFunctionHook *)
 539             malloc(sizeof(struct NetprocFunctionHook));
 540         newfcn->next = NetprocHookTable;
 541         newfcn->h_function_pointer = handler;
 542         NetprocHookTable = newfcn;
 543
 544         CtdlLogPrintf(CTDL_INFO, "Registered a new netproc function\n");
 545 }
 546
 547
 548 void CtdlUnregisterNetprocHook(int (*handler)(struct CtdlMessage *, char *) )
 549 {
 550         struct NetprocFunctionHook *cur, *p;
 551
 552         for (cur = NetprocHookTable; cur != NULL; cur = cur->next) {
 553                 /* This will also remove duplicates if any */
 554                 while (cur != NULL &&
 555                                 handler == cur->h_function_pointer ) {
 556                         CtdlLogPrintf(CTDL_INFO, "Unregistered netproc function\n");
 557                         p = cur->next;
 558                         if (cur == NetprocHookTable) {
 559                                 NetprocHookTable = p;
 560                         }
 561                         free(cur);
 562                         cur = p;
 563                 }
 564         }
 565 }
 566
 567 void CtdlDestroyNetprocHooks(void)
 568 {
 569         struct NetprocFunctionHook *cur, *p;
 570
 571         cur = NetprocHookTable;
 572         while (cur != NULL)
 573         {
 574                 CtdlLogPrintf(CTDL_INFO, "Unregistered netproc function\n");
 575                 p = cur->next;
 576                 free(cur);
 577                 cur = p;
 578         }
 579         NetprocHookTable = NULL;
 580 }
 581
 582
 583 void CtdlRegisterDeleteHook(void (*handler)(char *, long) )
 584 {
 585         struct DeleteFunctionHook *newfcn;
 586
 587         newfcn = (struct DeleteFunctionHook *)
 588             malloc(sizeof(struct DeleteFunctionHook));
 589         newfcn->next = DeleteHookTable;
 590         newfcn->h_function_pointer = handler;
 591         DeleteHookTable = newfcn;
 592
 593         CtdlLogPrintf(CTDL_INFO, "Registered a new netproc function\n");
 594 }
 595
 596
 597 void CtdlUnregisterDeleteHook(void (*handler)(char *, long) )
 598 {
 599         struct DeleteFunctionHook *cur, *p;
 600
 601         for (cur = DeleteHookTable; cur != NULL; cur = cur->next) {
 602                 /* This will also remove duplicates if any */
 603                 while (cur != NULL &&
 604                                 handler == cur->h_function_pointer ) {
 605                         CtdlLogPrintf(CTDL_INFO, "Unregistered netproc function\n");
 606                         p = cur->next;
 607                         if (cur == DeleteHookTable) {
 608                                 DeleteHookTable = p;
 609                         }
 610                         free(cur);
 611                         cur = p;
 612                 }
 613         }
 614 }
 615 void CtdlDestroyDeleteHooks(void)
 616 {
 617         struct DeleteFunctionHook *cur, *p;
 618
 619         cur = DeleteHookTable;
 620         while (cur != NULL)
 621         {
 622                 CtdlLogPrintf(CTDL_INFO, "Destroyed netproc function\n");
 623                 p = cur->next;
 624                 free(cur);
 625                 cur = p;
 626         }
 627         DeleteHookTable = NULL;
 628 }
 629
 630
 631
 632
 633 void CtdlRegisterFixedOutputHook(char *content_type, void (*handler)(char *, int) )
 634 {
 635         struct FixedOutputHook *newfcn;
 636
 637         newfcn = (struct FixedOutputHook *)
 638             malloc(sizeof(struct FixedOutputHook));
 639         newfcn->next = FixedOutputTable;
 640         newfcn->h_function_pointer = handler;
 641         safestrncpy(newfcn->content_type, content_type, sizeof newfcn->content_type);
 642         FixedOutputTable = newfcn;
 643
 644         CtdlLogPrintf(CTDL_INFO, "Registered a new fixed output function for %s\n", newfcn->content_type);
 645 }
 646
 647
 648 void CtdlUnregisterFixedOutputHook(char *content_type)
 649 {
 650         struct FixedOutputHook *cur, *p;
 651
 652         for (cur = FixedOutputTable; cur != NULL; cur = cur->next) {
 653                 /* This will also remove duplicates if any */
 654                 while (cur != NULL && (!strcasecmp(content_type, cur->content_type))) {
 655                         CtdlLogPrintf(CTDL_INFO, "Unregistered fixed output function for %s\n", content_type);
 656                         p = cur->next;
 657                         if (cur == FixedOutputTable) {
 658                                 FixedOutputTable = p;
 659                         }
 660                         free(cur);
 661                         cur = p;
 662                 }
 663         }
 664 }
 665
 666 void CtdlDestroyFixedOutputHooks(void)
 667 {
 668         struct FixedOutputHook *cur, *p;
 669
 670         cur = FixedOutputTable;
 671         while (cur != NULL)
 672         {
 673                 CtdlLogPrintf(CTDL_INFO, "Destroyed fixed output function for %s\n", cur->content_type);
 674                 p = cur->next;
 675                 free(cur);
 676                 cur = p;
 677
 678         }
 679         FixedOutputTable = NULL;
 680 }
 681
 682 /* returns nonzero if we found a hook and used it */
 683 int PerformFixedOutputHooks(char *content_type, char *content, int content_length)
 684 {
 685         struct FixedOutputHook *fcn;
 686
 687         for (fcn = FixedOutputTable; fcn != NULL; fcn = fcn->next) {
 688                 if (!strcasecmp(content_type, fcn->content_type)) {
 689                         (*fcn->h_function_pointer) (content, content_length);
 690                         return(1);
 691                 }
 692         }
 693         return(0);
 694 }
 695
 696
 697
 698
 699
 700 void CtdlRegisterXmsgHook(int (*fcn_ptr) (char *, char *, char *, char *), int order)
 701 {
 702
 703         struct XmsgFunctionHook *newfcn;
 704
 705         newfcn = (struct XmsgFunctionHook *) malloc(sizeof(struct XmsgFunctionHook));
 706         newfcn->next = XmsgHookTable;
 707         newfcn->order = order;
 708         newfcn->h_function_pointer = fcn_ptr;
 709         XmsgHookTable = newfcn;
 710         CtdlLogPrintf(CTDL_INFO, "Registered a new x-msg function (priority %d)\n", order);
 711 }
 712
 713
 714 void CtdlUnregisterXmsgHook(int (*fcn_ptr) (char *, char *, char *, char *), int order)
 715 {
 716         struct XmsgFunctionHook *cur, *p;
 717
 718         for (cur = XmsgHookTable; cur != NULL; cur = cur->next) {
 719                 /* This will also remove duplicates if any */
 720                 while (cur != NULL &&
 721                                 fcn_ptr == cur->h_function_pointer &&
 722                                 order == cur->order) {
 723                         CtdlLogPrintf(CTDL_INFO, "Unregistered x-msg function "
 724                                         "(priority %d)\n", order);
 725                         p = cur->next;
 726                         if (cur == XmsgHookTable) {
 727                                 XmsgHookTable = p;
 728                         }
 729                         free(cur);
 730                         cur = p;
 731                 }
 732         }
 733 }
 734
 735 void CtdlDestroyXmsgHooks(void)
 736 {
 737         struct XmsgFunctionHook *cur, *p;
 738
 739         cur = XmsgHookTable;
 740         while (cur != NULL)
 741         {
 742                 CtdlLogPrintf(CTDL_INFO, "Destroyed x-msg function "
 743                         "(priority %d)\n", cur->order);
 744                 p = cur->next;
 745
 746                 free(cur);
 747                 cur = p;
 748         }
 749         XmsgHookTable = NULL;
 750 }
 751
 752
 753 void CtdlRegisterServiceHook(int tcp_port,
 754                              char *sockpath,
 755                              void (*h_greeting_function) (void),
 756                              void (*h_command_function) (void),
 757                              void (*h_async_function) (void),
 758                              const char *ServiceName)
 759 {
 760         struct ServiceFunctionHook *newfcn;
 761         char *message;
 762         char *error;
 763
 764         error = NULL;
 765         newfcn = (struct ServiceFunctionHook *)
 766             malloc(sizeof(struct ServiceFunctionHook));
 767         message = (char*) malloc (SIZ);
 768
 769         newfcn->next = ServiceHookTable;
 770         newfcn->tcp_port = tcp_port;
 771         newfcn->sockpath = sockpath;
 772         newfcn->h_greeting_function = h_greeting_function;
 773         newfcn->h_command_function = h_command_function;
 774         newfcn->h_async_function = h_async_function;
 775         newfcn->ServiceName = ServiceName;
 776
 777         if (sockpath != NULL) {
 778                 newfcn->msock = ig_uds_server(sockpath, config.c_maxsessions, &error);
 779                 snprintf(message, SIZ, "Unix domain socket '%s': ", sockpath);
 780         }
 781         else if (tcp_port <= 0) {       /* port -1 to disable */
 782                 CtdlLogPrintf(CTDL_INFO, "Service %s has been manually disabled, skipping\n", ServiceName);
 783                 free (message);
 784                 free(newfcn);
 785                 return;
 786         }
 787         else {
 788                 newfcn->msock = ig_tcp_server(config.c_ip_addr,
 789                                               tcp_port,
 790                                               config.c_maxsessions,
 791                                               &error);
 792                 snprintf(message, SIZ, "TCP port %s:%d: (%s) ",
 793                          config.c_ip_addr, tcp_port, ServiceName);
 794         }
 795
 796         if (newfcn->msock > 0) {
 797                 ServiceHookTable = newfcn;
 798                 strcat(message, "registered.");
 799                 CtdlLogPrintf(CTDL_INFO, "%s\n", message);
 800         }
 801         else {
 802                 AddPortError(message, error);
 803                 strcat(message, "FAILED.");
 804                 CtdlLogPrintf(CTDL_CRIT, "%s\n", message);
 805                 free(error);
 806                 free(newfcn);
 807         }
 808         free(message);
 809 }
 810
 811
 812 void CtdlUnregisterServiceHook(int tcp_port, char *sockpath,
 813                         void (*h_greeting_function) (void),
 814                         void (*h_command_function) (void),
 815                         void (*h_async_function) (void)
 816                         )
 817 {
 818         struct ServiceFunctionHook *cur, *p;
 819
 820         for (cur = ServiceHookTable; cur != NULL; cur = cur->next) {
 821                 /* This will also remove duplicates if any */
 822                 while (cur != NULL &&
 823                                 !(sockpath && cur->sockpath &&
 824                                         strcmp(sockpath, cur->sockpath)) &&
 825                                 h_greeting_function == cur->h_greeting_function &&
 826                                 h_command_function == cur->h_command_function &&
 827                                 h_async_function == cur->h_async_function &&
 828                                 tcp_port == cur->tcp_port) {
 829                         close(cur->msock);
 830                         if (sockpath) {
 831                                 CtdlLogPrintf(CTDL_INFO, "Closed UNIX domain socket %s\n",
 832                                                 sockpath);
 833                         } else if (tcp_port) {
 834                                 CtdlLogPrintf(CTDL_INFO, "Closed TCP port %d\n", tcp_port);
 835                         } else {
 836                                 CtdlLogPrintf(CTDL_INFO, "Unregistered unknown service\n");
 837                         }
 838                         p = cur->next;
 839                         if (cur == ServiceHookTable) {
 840                                 ServiceHookTable = p;
 841                         }
 842                         free(cur);
 843                         cur = p;
 844                 }
 845         }
 846 }
 847
 848 void CtdlDestroyServiceHook(void)
 849 {
 850         struct ServiceFunctionHook *cur, *p;
 851
 852         cur = ServiceHookTable;
 853         while (cur != NULL)
 854         {
 855                 close(cur->msock);
 856                 if (cur->sockpath) {
 857                         CtdlLogPrintf(CTDL_INFO, "Closed UNIX domain socket %s\n",
 858                                 cur->sockpath);
 859                 } else if (cur->tcp_port) {
 860                         CtdlLogPrintf(CTDL_INFO, "Closed TCP port %d\n", cur->tcp_port);
 861                 } else {
 862                         CtdlLogPrintf(CTDL_INFO, "Unregistered unknown service\n");
 863                 }
 864                 p = cur->next;
 865                 free(cur);
 866                 cur = p;
 867         }
 868         ServiceHookTable = NULL;
 869 }
 870
 871 void CtdlRegisterSearchFuncHook(void (*fcn_ptr)(int *, long **, char *), char *name)
 872 {
 873         struct SearchFunctionHook *newfcn;
 874
 875         if (!name || !fcn_ptr) {
 876                 return;
 877         }
 878
 879         newfcn = (struct SearchFunctionHook *)
 880             malloc(sizeof(struct SearchFunctionHook));
 881         newfcn->next = SearchFunctionHookTable;
 882         newfcn->name = name;
 883         newfcn->fcn_ptr = fcn_ptr;
 884         SearchFunctionHookTable = newfcn;
 885
 886         CtdlLogPrintf(CTDL_INFO, "Registered a new search function (%s)\n", name);
 887 }
 888
 889 void CtdlUnregisterSearchFuncHook(void (*fcn_ptr)(int *, long **, char *), char *name)
 890 {
 891         struct SearchFunctionHook *cur, *p;
 892
 893         for (cur = SearchFunctionHookTable; cur != NULL; cur = cur->next) {
 894                 while (fcn_ptr && (cur->fcn_ptr == fcn_ptr) && name && !strcmp(name, cur->name)) {
 895                         CtdlLogPrintf(CTDL_INFO, "Unregistered search function(%s)\n", name);
 896                         p = cur->next;
 897                         if (cur == SearchFunctionHookTable) {
 898                                 SearchFunctionHookTable = p;
 899                         }
 900                         free (cur);
 901                         cur = p;
 902                 }
 903         }
 904 }
 905
 906 void CtdlModuleDoSearch(int *num_msgs, long **search_msgs, char *search_string, char *func_name)
 907 {
 908         struct SearchFunctionHook *fcn = NULL;
 909
 910         for (fcn = SearchFunctionHookTable; fcn != NULL; fcn = fcn->next) {
 911                 if (!func_name || !strcmp(func_name, fcn->name)) {
 912                         (*fcn->fcn_ptr) (num_msgs, search_msgs, search_string);
 913                         return;
 914                 }
 915         }
 916         *num_msgs = 0;
 917 }
 918
 919
 920 void PerformSessionHooks(int EventType)
 921 {
 922         struct SessionFunctionHook *fcn = NULL;
 923
 924         for (fcn = SessionHookTable; fcn != NULL; fcn = fcn->next) {
 925                 if (fcn->eventtype == EventType) {
 926                         (*fcn->h_function_pointer) ();
 927                 }
 928         }
 929 }
 930
 931 void PerformUserHooks(struct ctdluser *usbuf, int EventType)
 932 {
 933         struct UserFunctionHook *fcn = NULL;
 934
 935         for (fcn = UserHookTable; fcn != NULL; fcn = fcn->next) {
 936                 if (fcn->eventtype == EventType) {
 937                         (*fcn->h_function_pointer) (usbuf);
 938                 }
 939         }
 940 }
 941
 942 int PerformMessageHooks(struct CtdlMessage *msg, int EventType)
 943 {
 944         struct MessageFunctionHook *fcn = NULL;
 945         int total_retval = 0;
 946
 947         /* Other code may elect to protect this message from server-side
 948          * handlers; if this is the case, don't do anything.
 949         CtdlLogPrintf(CTDL_DEBUG, "** Event type is %d, flags are %d\n",
 950                 EventType, msg->cm_flags);
 951          */
 952         if (msg->cm_flags & CM_SKIP_HOOKS) {
 953                 CtdlLogPrintf(CTDL_DEBUG, "Skipping hooks\n");
 954                 return(0);
 955         }
 956
 957         /* Otherwise, run all the hooks appropriate to this event type.
 958          */
 959         for (fcn = MessageHookTable; fcn != NULL; fcn = fcn->next) {
 960                 if (fcn->eventtype == EventType) {
 961                         total_retval = total_retval +
 962                                 (*fcn->h_function_pointer) (msg);
 963                 }
 964         }
 965
 966         /* Return the sum of the return codes from the hook functions.  If
 967          * this is an EVT_BEFORESAVE event, a nonzero return code will cause
 968          * the save operation to abort.
 969          */
 970         return total_retval;
 971 }
 972
 973
 974 int PerformRoomHooks(struct ctdlroom *target_room)
 975 {
 976         struct RoomFunctionHook *fcn;
 977         int total_retval = 0;
 978
 979         CtdlLogPrintf(CTDL_DEBUG, "Performing room hooks for <%s>\n", target_room->QRname);
 980
 981         for (fcn = RoomHookTable; fcn != NULL; fcn = fcn->next) {
 982                 total_retval = total_retval + (*fcn->fcn_ptr) (target_room);
 983         }
 984
 985         /* Return the sum of the return codes from the hook functions.
 986          */
 987         return total_retval;
 988 }
 989
 990
 991 int PerformNetprocHooks(struct CtdlMessage *msg, char *target_room)
 992 {
 993         struct NetprocFunctionHook *fcn;
 994         int total_retval = 0;
 995
 996         for (fcn = NetprocHookTable; fcn != NULL; fcn = fcn->next) {
 997                 total_retval = total_retval +
 998                         (*fcn->h_function_pointer) (msg, target_room);
 999         }
1000
1001         /* Return the sum of the return codes from the hook functions.
1002          * A nonzero return code will cause the message to *not* be imported.
1003          */
1004         return total_retval;
1005 }
1006
1007
1008 void PerformDeleteHooks(char *room, long msgnum)
1009 {
1010         struct DeleteFunctionHook *fcn;
1011
1012         for (fcn = DeleteHookTable; fcn != NULL; fcn = fcn->next) {
1013                 (*fcn->h_function_pointer) (room, msgnum);
1014         }
1015 }
1016
1017
1018
1019
1020
1021 int PerformXmsgHooks(char *sender, char *sender_email, char *recp, char *msg)
1022 {
1023         struct XmsgFunctionHook *fcn;
1024         int total_sent = 0;
1025         int p;
1026
1027         for (p=0; p<MAX_XMSG_PRI; ++p) {
1028                 for (fcn = XmsgHookTable; fcn != NULL; fcn = fcn->next) {
1029                         if (fcn->order == p) {
1030                                 total_sent +=
1031                                         (*fcn->h_function_pointer)
1032                                                 (sender, sender_email, recp, msg);
1033                         }
1034                 }
1035                 /* Break out of the loop if a higher-priority function
1036                  * successfully delivered the message.  This prevents duplicate
1037                  * deliveries to local users simultaneously signed onto
1038                  * remote services.
1039                  */
1040                 if (total_sent) break;
1041         }
1042         return total_sent;
1043 }
1044
1045
1046
1047
1048 int CtdlRegisterDirectoryServiceFunc(int (*func)(char *cn, char *ou, void **object), int cmd, char *module)
1049 {
1050         struct DirectoryServiceHook *newfcn;
1051
1052         newfcn = DirectoryServiceHookList;
1053         while (newfcn)
1054         {
1055                 if (newfcn->cmd == cmd && !strcmp(newfcn->module, module))
1056                 {
1057                         CtdlLogPrintf(CTDL_ERR, "Directory service function already handled by module %s\n", module);
1058                         return -1;
1059                 }
1060                 newfcn = newfcn->next;
1061         }
1062
1063         newfcn = (struct DirectoryServiceHook *) malloc (sizeof(struct DirectoryServiceHook));
1064         newfcn->handler = func;
1065         newfcn->cmd = cmd;
1066         newfcn->module = module;
1067         newfcn->next = DirectoryServiceHookList;
1068         DirectoryServiceHookList = newfcn;
1069
1070         CtdlLogPrintf(CTDL_INFO, "Registered a new directory service function from module %s\n", module);
1071         return 0;
1072 }
1073
1074 int CtdlDoDirectoryServiceFunc(char *cn, char *ou, void **object, char *module, int cmd)
1075 {
1076         struct DirectoryServiceHook *curfcn;
1077         struct DirectoryObject *our_object_list = NULL;
1078         struct DirectoryObject *newobject = NULL;
1079         struct DirectoryObject *oldobject = NULL;
1080
1081
1082         curfcn = DirectoryServiceHookList;
1083         if (object)
1084                 our_object_list = (struct DirectoryObject *) *object;
1085
1086         while (curfcn)
1087         {
1088                 if (curfcn->cmd == cmd)
1089                 {
1090                         if (!module)
1091                         {
1092                                 if (cmd == DIRECTORY_CREATE_OBJECT)
1093                                 {
1094                                         newobject = (struct DirectoryObject*) malloc (sizeof(struct DirectoryObject));
1095                                         newobject->module = curfcn->module;
1096                                         newobject->object = NULL;
1097                                         newobject->next = our_object_list;
1098                                         our_object_list = newobject;
1099                                 }
1100                                 if (our_object_list)
1101                                 {
1102                                         for(newobject = our_object_list; newobject; newobject=newobject->next)
1103                                         {
1104                                                 if (!strcmp(newobject->module, curfcn->module))
1105                                                         (void) curfcn->handler(cn, ou, &newobject->object);
1106                                         }
1107                                 }
1108                                 else
1109                                         (void) curfcn->handler(cn, ou, NULL);
1110
1111                                 continue;
1112                         }
1113                         else
1114                         {
1115                                 if(!strcmp(curfcn->module, module))
1116                                 {
1117                                         if (cmd == DIRECTORY_CREATE_OBJECT)
1118                                         {
1119                                                 newobject = (struct DirectoryObject*) malloc (sizeof(struct DirectoryObject));
1120                                                 newobject->module = module;
1121                                                 newobject->object = NULL;
1122                                                 newobject->next = our_object_list;
1123                                                 our_object_list = newobject;
1124                                         }
1125                                         if (our_object_list)
1126                                         {
1127                                                 for(newobject = our_object_list; newobject; newobject=newobject->next)
1128                                                 {
1129                                                         if (!strcmp(newobject->module, curfcn->module))
1130                                                                 (void) curfcn->handler(cn, ou, &newobject->object);
1131                                                 }
1132                                         }
1133                                         else
1134                                                 (void) (curfcn->handler(cn, ou, NULL));
1135
1136                                         break;
1137                                 }
1138                         }
1139                 }
1140                 curfcn=curfcn->next;
1141         }
1142         if (our_object_list)
1143         {
1144                 *object = our_object_list;
1145                 if (cmd == DIRECTORY_FREE_OBJECT)
1146                 {       // The objects pointed to by the list should have been freed by the module that created it
1147                         for(newobject = our_object_list; newobject; )
1148                         {
1149                                 oldobject=newobject;
1150                                 newobject=newobject->next;
1151                                 free(oldobject);
1152                         }
1153                         *object=NULL;
1154                 }
1155         }
1156         return 0;
1157 }
1158
1159 void CtdlDestroyDirectoryServiceFuncs(void)
1160 {
1161         struct DirectoryServiceHook *cur, *next;
1162
1163         cur = DirectoryServiceHookList;
1164         DirectoryServiceHookList = NULL;
1165         while (cur)
1166         {
1167                 next = cur->next;
1168                 CtdlLogPrintf(CTDL_INFO, "Destroyed directory service function for module %s.\n", cur->module);
1169                 free(cur);
1170                 cur = next;
1171         }
1172 }
1173
1174 /*
1175  * Dirty hack until we impliment a hook mechanism for this
1176  */
1177 void CtdlModuleStartCryptoMsgs(char *ok_response, char *nosup_response, char *error_response)
1178 {
1179 #ifdef HAVE_OPENSSL
1180         CtdlStartTLS (ok_response, nosup_response, error_response);
1181 #endif
1182 }