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