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 static 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         quickie_message("Citadel", NULL, NULL, AIDEROOM, Message, FMT_FIXED, ErrSubject);
 111         if (errormessages!=NULL) free (errormessages);
 112         errormessages = NULL;
 113         if (portlist!=NULL) free (portlist);
 114         portlist = NULL;
 115         free(Message);
 116 }
 117
 118
 119
 120 void AppendString(char **target, char *append, size_t *len, size_t rate)
 121 {
 122         size_t oLen = 0;
 123         long AddLen;
 124         long RelPtr = 0;
 125
 126         AddLen = strlen(append);
 127
 128         if (*len == 0)
 129         {
 130                 *len = rate;
 131
 132                 *target = (char*)malloc (*len * SIZ);
 133         }
 134         else
 135         {
 136                 oLen = strlen(*target);
 137                 RelPtr = strlen(*target);
 138                 if (oLen + AddLen + 2 > *len * SIZ)
 139                 {
 140                         char *Buff = *target;
 141                         size_t NewSiz = *len + 10;
 142                         *target = malloc (NewSiz * SIZ);
 143                         memcpy (*target, Buff, NewSiz * SIZ);
 144                         *len = NewSiz;
 145                 }
 146         }
 147         memcpy (*target + oLen, append, AddLen);
 148         (*target)[oLen + AddLen + 1] = '\n';
 149         (*target)[oLen + AddLen + 2] = '\0';
 150 }
 151
 152 void AddPortError(char *Port, char *ErrorMessage)
 153 {
 154         char *pos;
 155         long len;
 156
 157         DetailErrorFlags |= ERR_PORT;
 158
 159         AppendString(&errormessages, ErrorMessage, &nSizErrmsg, 10);
 160         AppendString(&portlist, Port, &nSizPort, 2);
 161
 162         pos = strchr (portlist, ':');
 163         if (pos != NULL) *pos = ';';
 164
 165         len = strlen (errormessages);
 166         if (nSizErrmsg * SIZ > len + 3)
 167         {
 168                 errormessages[len] = ';';
 169                 errormessages[len+1] = ' ';
 170                 errormessages[len+2] = '\0';
 171         }
 172 }
 173
 174
 175 void CtdlRegisterProtoHook(void (*handler) (char *), char *cmd, char *desc)
 176 {
 177         struct ProtoFunctionHook *p;
 178
 179         p = (struct ProtoFunctionHook *)
 180                 malloc(sizeof(struct ProtoFunctionHook));
 181
 182         if (p == NULL) {
 183                 fprintf(stderr, "can't malloc new ProtoFunctionHook\n");
 184                 exit(EXIT_FAILURE);
 185         }
 186         p->handler = handler;
 187         p->cmd = cmd;
 188         p->desc = desc;
 189         p->next = ProtoHookList;
 190         ProtoHookList = p;
 191         lprintf(CTDL_INFO, "Registered server command %s (%s)\n", cmd, desc);
 192 }
 193
 194
 195 void CtdlUnregisterProtoHook(void (*handler) (char *), char *cmd)
 196 {
 197         struct ProtoFunctionHook *cur = NULL;
 198         struct ProtoFunctionHook *p = NULL;
 199         struct ProtoFunctionHook *lastcur = NULL;
 200
 201         for (cur = ProtoHookList;
 202              cur != NULL;
 203              cur = (cur != NULL)? cur->next: NULL) {
 204                 /* This will also remove duplicates if any */
 205                 while (cur != NULL &&
 206                                 handler == cur->handler &&
 207                                 !strcmp(cmd, cur->cmd)) {
 208                         lprintf(CTDL_INFO, "Unregistered server command %s (%s)\n",
 209                                         cmd, cur->desc);
 210                         p = cur->next;
 211                         if (cur == ProtoHookList) {
 212                                 ProtoHookList = p;
 213                         }
 214                         else if (lastcur != NULL)
 215                         {
 216                                 lastcur->next = p;
 217                         }
 218                         free(cur);
 219                         cur = p;
 220                 }
 221                 lastcur = cur;
 222         }
 223 }
 224
 225 void CtdlDestroyProtoHooks(void)
 226 {
 227         struct ProtoFunctionHook *cur, *p;
 228
 229         cur = ProtoHookList;
 230         while (cur != NULL)
 231         {
 232                 lprintf(CTDL_INFO, "Destroyed server command %s (%s)\n",
 233                         cur->cmd, cur->desc);
 234                 p = cur->next;
 235                 free(cur);
 236                 cur = p;
 237         }
 238         ProtoHookList = NULL;
 239 }
 240
 241
 242 int DLoader_Exec_Cmd(char *cmdbuf)
 243 {
 244         struct ProtoFunctionHook *p;
 245
 246         for (p = ProtoHookList; p; p = p->next) {
 247                 if (!strncasecmp(cmdbuf, p->cmd, 4)) {
 248                         p->handler(&cmdbuf[5]);
 249                         return 1;
 250                 }
 251         }
 252         return 0;
 253 }
 254
 255 #if 0
 256 void initialize_server_extensions(void)
 257 {
 258         long filter;
 259
 260         nSizErrmsg = 0;
 261
 262         /*lprintf(CTDL_INFO, "%s\n", serv_bio_init());
 263         lprintf(CTDL_INFO, "%s\n", serv_calendar_init());
 264         lprintf(CTDL_INFO, "%s\n", serv_notes_init());
 265         lprintf(CTDL_INFO, "%s\n", serv_ldap_init());
 266         lprintf(CTDL_INFO, "%s\n", serv_chat_init());
 267         lprintf(CTDL_INFO, "%s\n", serv_expire_init());
 268         lprintf(CTDL_INFO, "%s\n", serv_imap_init());
 269         lprintf(CTDL_INFO, "%s\n", serv_upgrade_init());
 270         lprintf(CTDL_INFO, "%s\n", serv_inetcfg_init());
 271         lprintf(CTDL_INFO, "%s\n", serv_listsub_init());
 272         lprintf(CTDL_INFO, "%s\n", serv_mrtg_init());
 273         lprintf(CTDL_INFO, "%s\n", serv_netfilter_init());
 274         lprintf(CTDL_INFO, "%s\n", serv_network_init());
 275         lprintf(CTDL_INFO, "%s\n", serv_newuser_init());
 276         lprintf(CTDL_INFO, "%s\n", serv_pas2_init());
 277         lprintf(CTDL_INFO, "%s\n", serv_smtp_init());
 278         lprintf(CTDL_INFO, "%s\n", serv_pop3_init());
 279         lprintf(CTDL_INFO, "%s\n", serv_rwho_init());
 280         lprintf(CTDL_INFO, "%s\n", serv_spam_init());*/
 281         /* lprintf(CTDL_INFO, "%s\n", serv_test_init()); */
 282         /*lprintf(CTDL_INFO, "%s\n", serv_vandelay_init());
 283         lprintf(CTDL_INFO, "%s\n", serv_vcard_init());
 284         lprintf(CTDL_INFO, "%s\n", serv_fulltext_init());
 285         lprintf(CTDL_INFO, "%s\n", serv_autocompletion_init());
 286         lprintf(CTDL_INFO, "%s\n", serv_postfix_tcpdict());
 287         lprintf(CTDL_INFO, "%s\n", serv_sieve_init());
 288         lprintf(CTDL_INFO, "%s\n", serv_managesieve_init());
 289         lprintf(CTDL_INFO, "%s\n", serv_funambol_init());*/
 290         for (filter = 1; filter != 0; filter = filter << 1)
 291                 if ((filter & DetailErrorFlags) != 0)
 292                         LogPrintMessages(filter);
 293 }
 294
 295 #endif
 296
 297 void CtdlRegisterCleanupHook(void (*fcn_ptr) (void))
 298 {
 299
 300         struct CleanupFunctionHook *newfcn;
 301
 302         newfcn = (struct CleanupFunctionHook *)
 303             malloc(sizeof(struct CleanupFunctionHook));
 304         newfcn->next = CleanupHookTable;
 305         newfcn->h_function_pointer = fcn_ptr;
 306         CleanupHookTable = newfcn;
 307
 308         lprintf(CTDL_INFO, "Registered a new cleanup function\n");
 309 }
 310
 311
 312 void CtdlUnregisterCleanupHook(void (*fcn_ptr) (void))
 313 {
 314         struct CleanupFunctionHook *cur, *p;
 315
 316         for (cur = CleanupHookTable; cur != NULL; cur = cur->next) {
 317                 /* This will also remove duplicates if any */
 318                 while (cur != NULL &&
 319                                 fcn_ptr == cur->h_function_pointer) {
 320                         lprintf(CTDL_INFO, "Unregistered cleanup function\n");
 321                         p = cur->next;
 322                         if (cur == CleanupHookTable) {
 323                                 CleanupHookTable = p;
 324                         }
 325                         free(cur);
 326                         cur = p;
 327                 }
 328         }
 329 }
 330
 331 void CtdlDestroyCleanupHooks(void)
 332 {
 333         struct CleanupFunctionHook *cur, *p;
 334
 335         cur = CleanupHookTable;
 336         while (cur != NULL)
 337         {
 338                 lprintf(CTDL_INFO, "Destroyed cleanup function\n");
 339                 p = cur->next;
 340                 free(cur);
 341                 cur = p;
 342         }
 343         CleanupHookTable = NULL;
 344 }
 345
 346
 347 void CtdlRegisterSessionHook(void (*fcn_ptr) (void), int EventType)
 348 {
 349
 350         struct SessionFunctionHook *newfcn;
 351
 352         newfcn = (struct SessionFunctionHook *)
 353             malloc(sizeof(struct SessionFunctionHook));
 354         newfcn->next = SessionHookTable;
 355         newfcn->h_function_pointer = fcn_ptr;
 356         newfcn->eventtype = EventType;
 357         SessionHookTable = newfcn;
 358
 359         lprintf(CTDL_INFO, "Registered a new session function (type %d)\n",
 360                 EventType);
 361 }
 362
 363
 364 void CtdlUnregisterSessionHook(void (*fcn_ptr) (void), int EventType)
 365 {
 366         struct SessionFunctionHook *cur, *p;
 367
 368         for (cur = SessionHookTable; cur != NULL; cur = cur->next) {
 369                 /* This will also remove duplicates if any */
 370                 while (cur != NULL &&
 371                                 fcn_ptr == cur->h_function_pointer &&
 372                                 EventType == cur->eventtype) {
 373                         lprintf(CTDL_INFO, "Unregistered session function (type %d)\n",
 374                                         EventType);
 375                         p = cur->next;
 376                         if (cur == SessionHookTable) {
 377                                 SessionHookTable = p;
 378                         }
 379                         free(cur);
 380                         cur = p;
 381                 }
 382         }
 383 }
 384
 385 void CtdlDestroySessionHooks(void)
 386 {
 387         struct SessionFunctionHook *cur, *p;
 388
 389         cur = SessionHookTable;
 390         while (cur != NULL)
 391         {
 392                 lprintf(CTDL_INFO, "Destroyed session function\n");
 393                 p = cur->next;
 394                 free(cur);
 395                 cur = p;
 396         }
 397         SessionHookTable = NULL;
 398 }
 399
 400
 401 void CtdlRegisterUserHook(void (*fcn_ptr) (struct ctdluser *), int EventType)
 402 {
 403
 404         struct UserFunctionHook *newfcn;
 405
 406         newfcn = (struct UserFunctionHook *)
 407             malloc(sizeof(struct UserFunctionHook));
 408         newfcn->next = UserHookTable;
 409         newfcn->h_function_pointer = fcn_ptr;
 410         newfcn->eventtype = EventType;
 411         UserHookTable = newfcn;
 412
 413         lprintf(CTDL_INFO, "Registered a new user function (type %d)\n",
 414                 EventType);
 415 }
 416
 417
 418 void CtdlUnregisterUserHook(void (*fcn_ptr) (struct ctdluser *), int EventType)
 419 {
 420         struct UserFunctionHook *cur, *p;
 421
 422         for (cur = UserHookTable; cur != NULL; cur = cur->next) {
 423                 /* This will also remove duplicates if any */
 424                 while (cur != NULL &&
 425                                 fcn_ptr == cur->h_function_pointer &&
 426                                 EventType == cur->eventtype) {
 427                         lprintf(CTDL_INFO, "Unregistered user function (type %d)\n",
 428                                         EventType);
 429                         p = cur->next;
 430                         if (cur == UserHookTable) {
 431                                 UserHookTable = p;
 432                         }
 433                         free(cur);
 434                         cur = p;
 435                 }
 436         }
 437 }
 438
 439 void CtdlDestroyUserHooks(void)
 440 {
 441         struct UserFunctionHook *cur, *p;
 442
 443         cur = UserHookTable;
 444         while (cur != NULL)
 445         {
 446                 lprintf(CTDL_INFO, "Destroyed user function \n");
 447                 p = cur->next;
 448                 free(cur);
 449                 cur = p;
 450         }
 451         UserHookTable = NULL;
 452 }
 453
 454
 455 void CtdlRegisterMessageHook(int (*handler)(struct CtdlMessage *),
 456                                 int EventType)
 457 {
 458
 459         struct MessageFunctionHook *newfcn;
 460
 461         newfcn = (struct MessageFunctionHook *)
 462             malloc(sizeof(struct MessageFunctionHook));
 463         newfcn->next = MessageHookTable;
 464         newfcn->h_function_pointer = handler;
 465         newfcn->eventtype = EventType;
 466         MessageHookTable = newfcn;
 467
 468         lprintf(CTDL_INFO, "Registered a new message function (type %d)\n",
 469                 EventType);
 470 }
 471
 472
 473 void CtdlUnregisterMessageHook(int (*handler)(struct CtdlMessage *),
 474                 int EventType)
 475 {
 476         struct MessageFunctionHook *cur, *p;
 477
 478         for (cur = MessageHookTable; cur != NULL; cur = cur->next) {
 479                 /* This will also remove duplicates if any */
 480                 while (cur != NULL &&
 481                                 handler == cur->h_function_pointer &&
 482                                 EventType == cur->eventtype) {
 483                         lprintf(CTDL_INFO, "Unregistered message function (type %d)\n",
 484                                         EventType);
 485                         p = cur->next;
 486                         if (cur == MessageHookTable) {
 487                                 MessageHookTable = p;
 488                         }
 489                         free(cur);
 490                         cur = p;
 491                 }
 492         }
 493 }
 494
 495 void CtdlDestroyMessageHook(void)
 496 {
 497         struct MessageFunctionHook *cur, *p;
 498
 499         cur = MessageHookTable;
 500         while (cur != NULL)
 501         {
 502                 lprintf(CTDL_INFO, "Destroyed message function \n");
 503                 p = cur->next;
 504                 free(cur);
 505                 cur = p;
 506         }
 507         MessageHookTable = NULL;
 508 }
 509
 510
 511 void CtdlRegisterRoomHook(int (*fcn_ptr)(struct ctdlroom *))
 512 {
 513         struct RoomFunctionHook *newfcn;
 514
 515         newfcn = (struct RoomFunctionHook *)
 516             malloc(sizeof(struct RoomFunctionHook));
 517         newfcn->next = RoomHookTable;
 518         newfcn->fcn_ptr = fcn_ptr;
 519         RoomHookTable = newfcn;
 520
 521         lprintf(CTDL_INFO, "Registered a new room function\n");
 522 }
 523
 524
 525 void CtdlUnregisterRoomHook(int (*fcn_ptr)(struct ctdlroom *))
 526 {
 527         struct RoomFunctionHook *cur, *p;
 528
 529         for (cur = RoomHookTable; cur != NULL; cur = cur->next) {
 530                 while (cur != NULL && fcn_ptr == cur->fcn_ptr) {
 531                         lprintf(CTDL_INFO, "Unregistered room function\n");
 532                         p = cur->next;
 533                         if (cur == RoomHookTable) {
 534                                 RoomHookTable = p;
 535                         }
 536                         free(cur);
 537                         cur = p;
 538                 }
 539         }
 540 }
 541
 542
 543 void CtdlDestroyRoomHooks(void)
 544 {
 545         struct RoomFunctionHook *cur, *p;
 546
 547         cur = RoomHookTable;
 548         while (cur != NULL)
 549         {
 550                 lprintf(CTDL_INFO, "Unregistered room function\n");
 551                 p = cur->next;
 552                 free(cur);
 553                 cur = p;
 554         }
 555         RoomHookTable = NULL;
 556 }
 557
 558 void CtdlRegisterNetprocHook(int (*handler)(struct CtdlMessage *, char *) )
 559 {
 560         struct NetprocFunctionHook *newfcn;
 561
 562         newfcn = (struct NetprocFunctionHook *)
 563             malloc(sizeof(struct NetprocFunctionHook));
 564         newfcn->next = NetprocHookTable;
 565         newfcn->h_function_pointer = handler;
 566         NetprocHookTable = newfcn;
 567
 568         lprintf(CTDL_INFO, "Registered a new netproc function\n");
 569 }
 570
 571
 572 void CtdlUnregisterNetprocHook(int (*handler)(struct CtdlMessage *, char *) )
 573 {
 574         struct NetprocFunctionHook *cur, *p;
 575
 576         for (cur = NetprocHookTable; cur != NULL; cur = cur->next) {
 577                 /* This will also remove duplicates if any */
 578                 while (cur != NULL &&
 579                                 handler == cur->h_function_pointer ) {
 580                         lprintf(CTDL_INFO, "Unregistered netproc function\n");
 581                         p = cur->next;
 582                         if (cur == NetprocHookTable) {
 583                                 NetprocHookTable = p;
 584                         }
 585                         free(cur);
 586                         cur = p;
 587                 }
 588         }
 589 }
 590
 591 void CtdlDestroyNetprocHooks(void)
 592 {
 593         struct NetprocFunctionHook *cur, *p;
 594
 595         cur = NetprocHookTable;
 596         while (cur != NULL)
 597         {
 598                 lprintf(CTDL_INFO, "Unregistered netproc function\n");
 599                 p = cur->next;
 600                 free(cur);
 601                 cur = p;
 602         }
 603         NetprocHookTable = NULL;
 604 }
 605
 606
 607 void CtdlRegisterDeleteHook(void (*handler)(char *, long) )
 608 {
 609         struct DeleteFunctionHook *newfcn;
 610
 611         newfcn = (struct DeleteFunctionHook *)
 612             malloc(sizeof(struct DeleteFunctionHook));
 613         newfcn->next = DeleteHookTable;
 614         newfcn->h_function_pointer = handler;
 615         DeleteHookTable = newfcn;
 616
 617         lprintf(CTDL_INFO, "Registered a new netproc function\n");
 618 }
 619
 620
 621 void CtdlUnregisterDeleteHook(void (*handler)(char *, long) )
 622 {
 623         struct DeleteFunctionHook *cur, *p;
 624
 625         for (cur = DeleteHookTable; cur != NULL; cur = cur->next) {
 626                 /* This will also remove duplicates if any */
 627                 while (cur != NULL &&
 628                                 handler == cur->h_function_pointer ) {
 629                         lprintf(CTDL_INFO, "Unregistered netproc function\n");
 630                         p = cur->next;
 631                         if (cur == DeleteHookTable) {
 632                                 DeleteHookTable = p;
 633                         }
 634                         free(cur);
 635                         cur = p;
 636                 }
 637         }
 638 }
 639 void CtdlDestroyDeleteHooks(void)
 640 {
 641         struct DeleteFunctionHook *cur, *p;
 642
 643         cur = DeleteHookTable;
 644         while (cur != NULL)
 645         {
 646                 lprintf(CTDL_INFO, "Destroyed netproc function\n");
 647                 p = cur->next;
 648                 free(cur);
 649                 cur = p;
 650         }
 651         DeleteHookTable = NULL;
 652 }
 653
 654
 655
 656
 657 void CtdlRegisterFixedOutputHook(char *content_type, void (*handler)(char *, int) )
 658 {
 659         struct FixedOutputHook *newfcn;
 660
 661         newfcn = (struct FixedOutputHook *)
 662             malloc(sizeof(struct FixedOutputHook));
 663         newfcn->next = FixedOutputTable;
 664         newfcn->h_function_pointer = handler;
 665         safestrncpy(newfcn->content_type, content_type, sizeof newfcn->content_type);
 666         FixedOutputTable = newfcn;
 667
 668         lprintf(CTDL_INFO, "Registered a new fixed output function for %s\n", newfcn->content_type);
 669 }
 670
 671
 672 void CtdlUnregisterFixedOutputHook(char *content_type)
 673 {
 674         struct FixedOutputHook *cur, *p;
 675
 676         for (cur = FixedOutputTable; cur != NULL; cur = cur->next) {
 677                 /* This will also remove duplicates if any */
 678                 while (cur != NULL && (!strcasecmp(content_type, cur->content_type))) {
 679                         lprintf(CTDL_INFO, "Unregistered fixed output function for %s\n", content_type);
 680                         p = cur->next;
 681                         if (cur == FixedOutputTable) {
 682                                 FixedOutputTable = p;
 683                         }
 684                         free(cur);
 685                         cur = p;
 686                 }
 687         }
 688 }
 689
 690 void CtdlDestroyFixedOutputHooks(void)
 691 {
 692         struct FixedOutputHook *cur, *p;
 693
 694         cur = FixedOutputTable;
 695         while (cur != NULL)
 696         {
 697                 lprintf(CTDL_INFO, "Destroyed fixed output function for %s\n", cur->content_type);
 698                 p = cur->next;
 699                 free(cur);
 700                 cur = p;
 701
 702         }
 703         FixedOutputTable = NULL;
 704 }
 705
 706 /* returns nonzero if we found a hook and used it */
 707 int PerformFixedOutputHooks(char *content_type, char *content, int content_length)
 708 {
 709         struct FixedOutputHook *fcn;
 710
 711         for (fcn = FixedOutputTable; fcn != NULL; fcn = fcn->next) {
 712                 if (!strcasecmp(content_type, fcn->content_type)) {
 713                         (*fcn->h_function_pointer) (content, content_length);
 714                         return(1);
 715                 }
 716         }
 717         return(0);
 718 }
 719
 720
 721
 722
 723
 724 void CtdlRegisterXmsgHook(int (*fcn_ptr) (char *, char *, char *), int order)
 725 {
 726
 727         struct XmsgFunctionHook *newfcn;
 728
 729         newfcn = (struct XmsgFunctionHook *)
 730             malloc(sizeof(struct XmsgFunctionHook));
 731         newfcn->next = XmsgHookTable;
 732         newfcn->order = order;
 733         newfcn->h_function_pointer = fcn_ptr;
 734         XmsgHookTable = newfcn;
 735         lprintf(CTDL_INFO, "Registered a new x-msg function (priority %d)\n", order);
 736 }
 737
 738
 739 void CtdlUnregisterXmsgHook(int (*fcn_ptr) (char *, char *, char *), int order)
 740 {
 741         struct XmsgFunctionHook *cur, *p;
 742
 743         for (cur = XmsgHookTable; cur != NULL; cur = cur->next) {
 744                 /* This will also remove duplicates if any */
 745                 while (cur != NULL &&
 746                                 fcn_ptr == cur->h_function_pointer &&
 747                                 order == cur->order) {
 748                         lprintf(CTDL_INFO, "Unregistered x-msg function "
 749                                         "(priority %d)\n", order);
 750                         p = cur->next;
 751                         if (cur == XmsgHookTable) {
 752                                 XmsgHookTable = p;
 753                         }
 754                         free(cur);
 755                         cur = p;
 756                 }
 757         }
 758 }
 759
 760 void CtdlDestroyXmsgHooks(void)
 761 {
 762         struct XmsgFunctionHook *cur, *p;
 763
 764         cur = XmsgHookTable;
 765         while (cur != NULL)
 766         {
 767                 lprintf(CTDL_INFO, "Destroyed x-msg function "
 768                         "(priority %d)\n", cur->order);
 769                 p = cur->next;
 770
 771                 free(cur);
 772                 cur = p;
 773         }
 774         XmsgHookTable = NULL;
 775 }
 776
 777
 778 void CtdlRegisterServiceHook(int tcp_port,
 779                              char *sockpath,
 780                              void (*h_greeting_function) (void),
 781                              void (*h_command_function) (void),
 782                              void (*h_async_function) (void),
 783                              const char *ServiceName)
 784 {
 785         struct ServiceFunctionHook *newfcn;
 786         char *message;
 787         char *error;
 788
 789         error = NULL;
 790         newfcn = (struct ServiceFunctionHook *)
 791             malloc(sizeof(struct ServiceFunctionHook));
 792         message = (char*) malloc (SIZ);
 793
 794         newfcn->next = ServiceHookTable;
 795         newfcn->tcp_port = tcp_port;
 796         newfcn->sockpath = sockpath;
 797         newfcn->h_greeting_function = h_greeting_function;
 798         newfcn->h_command_function = h_command_function;
 799         newfcn->h_async_function = h_async_function;
 800         newfcn->ServiceName = ServiceName;
 801
 802         if (sockpath != NULL) {
 803                 newfcn->msock = ig_uds_server(sockpath, config.c_maxsessions, &error);
 804                 snprintf(message, SIZ, "Unix domain socket '%s': ", sockpath);
 805         }
 806         else if (tcp_port <= 0) {       /* port -1 to disable */
 807                 lprintf(CTDL_INFO, "Service %s has been manually disabled, skipping\n", ServiceName);
 808                 free (message);
 809                 free(newfcn);
 810                 return;
 811         }
 812         else {
 813                 newfcn->msock = ig_tcp_server(config.c_ip_addr,
 814                                               tcp_port,
 815                                               config.c_maxsessions,
 816                                               &error);
 817                 snprintf(message, SIZ, "TCP port %s:%d: (%s) ",
 818                          config.c_ip_addr, tcp_port, ServiceName);
 819         }
 820
 821         if (newfcn->msock > 0) {
 822                 ServiceHookTable = newfcn;
 823                 strcat(message, "registered.");
 824                 lprintf(CTDL_INFO, "%s\n", message);
 825         }
 826         else {
 827                 AddPortError(message, error);
 828                 strcat(message, "FAILED.");
 829                 lprintf(CTDL_CRIT, "%s\n", message);
 830                 free(error);
 831                 free(newfcn);
 832         }
 833         free(message);
 834 }
 835
 836
 837 void CtdlUnregisterServiceHook(int tcp_port, char *sockpath,
 838                         void (*h_greeting_function) (void),
 839                         void (*h_command_function) (void),
 840                         void (*h_async_function) (void)
 841                         )
 842 {
 843         struct ServiceFunctionHook *cur, *p;
 844
 845         for (cur = ServiceHookTable; cur != NULL; cur = cur->next) {
 846                 /* This will also remove duplicates if any */
 847                 while (cur != NULL &&
 848                                 !(sockpath && cur->sockpath &&
 849                                         strcmp(sockpath, cur->sockpath)) &&
 850                                 h_greeting_function == cur->h_greeting_function &&
 851                                 h_command_function == cur->h_command_function &&
 852                                 h_async_function == cur->h_async_function &&
 853                                 tcp_port == cur->tcp_port) {
 854                         close(cur->msock);
 855                         if (sockpath) {
 856                                 lprintf(CTDL_INFO, "Closed UNIX domain socket %s\n",
 857                                                 sockpath);
 858                         } else if (tcp_port) {
 859                                 lprintf(CTDL_INFO, "Closed TCP port %d\n", tcp_port);
 860                         } else {
 861                                 lprintf(CTDL_INFO, "Unregistered unknown service\n");
 862                         }
 863                         p = cur->next;
 864                         if (cur == ServiceHookTable) {
 865                                 ServiceHookTable = p;
 866                         }
 867                         free(cur);
 868                         cur = p;
 869                 }
 870         }
 871 }
 872
 873 void CtdlDestroyServiceHook(void)
 874 {
 875         struct ServiceFunctionHook *cur, *p;
 876
 877         cur = ServiceHookTable;
 878         while (cur != NULL)
 879         {
 880                 close(cur->msock);
 881                 if (cur->sockpath) {
 882                         lprintf(CTDL_INFO, "Closed UNIX domain socket %s\n",
 883                                 cur->sockpath);
 884                 } else if (cur->tcp_port) {
 885                         lprintf(CTDL_INFO, "Closed TCP port %d\n", cur->tcp_port);
 886                 } else {
 887                         lprintf(CTDL_INFO, "Unregistered unknown service\n");
 888                 }
 889                 p = cur->next;
 890                 free(cur);
 891                 cur = p;
 892         }
 893         ServiceHookTable = NULL;
 894 }
 895
 896 void CtdlRegisterSearchFuncHook(void (*fcn_ptr)(int *, long **, char *), char *name)
 897 {
 898         struct SearchFunctionHook *newfcn;
 899
 900         if (!name || !fcn_ptr) {
 901                 return;
 902         }
 903
 904         newfcn = (struct SearchFunctionHook *)
 905             malloc(sizeof(struct SearchFunctionHook));
 906         newfcn->next = SearchFunctionHookTable;
 907         newfcn->name = name;
 908         newfcn->fcn_ptr = fcn_ptr;
 909         SearchFunctionHookTable = newfcn;
 910
 911         lprintf(CTDL_INFO, "Registered a new search function (%s)\n", name);
 912 }
 913
 914 void CtdlUnregisterSearchFuncHook(void (*fcn_ptr)(int *, long **, char *), char *name)
 915 {
 916         struct SearchFunctionHook *cur, *p;
 917
 918         for (cur = SearchFunctionHookTable; cur != NULL; cur = cur->next) {
 919                 while (fcn_ptr && (cur->fcn_ptr == fcn_ptr) && name && !strcmp(name, cur->name)) {
 920                         lprintf(CTDL_INFO, "Unregistered search function(%s)\n", name);
 921                         p = cur->next;
 922                         if (cur == SearchFunctionHookTable) {
 923                                 SearchFunctionHookTable = p;
 924                         }
 925                         free (cur);
 926                         cur = p;
 927                 }
 928         }
 929 }
 930
 931 void CtdlModuleDoSearch(int *num_msgs, long **search_msgs, char *search_string, char *func_name)
 932 {
 933         struct SearchFunctionHook *fcn = NULL;
 934
 935         for (fcn = SearchFunctionHookTable; fcn != NULL; fcn = fcn->next) {
 936                 if (!func_name || !strcmp(func_name, fcn->name)) {
 937                         (*fcn->fcn_ptr) (num_msgs, search_msgs, search_string);
 938                         return;
 939                 }
 940         }
 941         *num_msgs = 0;
 942 }
 943
 944
 945 void PerformSessionHooks(int EventType)
 946 {
 947         struct SessionFunctionHook *fcn = NULL;
 948
 949         for (fcn = SessionHookTable; fcn != NULL; fcn = fcn->next) {
 950                 if (fcn->eventtype == EventType) {
 951                         (*fcn->h_function_pointer) ();
 952                 }
 953         }
 954 }
 955
 956 void PerformUserHooks(struct ctdluser *usbuf, int EventType)
 957 {
 958         struct UserFunctionHook *fcn = NULL;
 959
 960         for (fcn = UserHookTable; fcn != NULL; fcn = fcn->next) {
 961                 if (fcn->eventtype == EventType) {
 962                         (*fcn->h_function_pointer) (usbuf);
 963                 }
 964         }
 965 }
 966
 967 int PerformMessageHooks(struct CtdlMessage *msg, int EventType)
 968 {
 969         struct MessageFunctionHook *fcn = NULL;
 970         int total_retval = 0;
 971
 972         /* Other code may elect to protect this message from server-side
 973          * handlers; if this is the case, don't do anything.
 974         lprintf(CTDL_DEBUG, "** Event type is %d, flags are %d\n",
 975                 EventType, msg->cm_flags);
 976          */
 977         if (msg->cm_flags & CM_SKIP_HOOKS) {
 978                 lprintf(CTDL_DEBUG, "Skipping hooks\n");
 979                 return(0);
 980         }
 981
 982         /* Otherwise, run all the hooks appropriate to this event type.
 983          */
 984         for (fcn = MessageHookTable; fcn != NULL; fcn = fcn->next) {
 985                 if (fcn->eventtype == EventType) {
 986                         total_retval = total_retval +
 987                                 (*fcn->h_function_pointer) (msg);
 988                 }
 989         }
 990
 991         /* Return the sum of the return codes from the hook functions.  If
 992          * this is an EVT_BEFORESAVE event, a nonzero return code will cause
 993          * the save operation to abort.
 994          */
 995         return total_retval;
 996 }
 997
 998
 999 int PerformRoomHooks(struct ctdlroom *target_room)
1000 {
1001         struct RoomFunctionHook *fcn;
1002         int total_retval = 0;
1003
1004         lprintf(CTDL_DEBUG, "Performing room hooks for <%s>\n", target_room->QRname);
1005
1006         for (fcn = RoomHookTable; fcn != NULL; fcn = fcn->next) {
1007                 total_retval = total_retval + (*fcn->fcn_ptr) (target_room);
1008         }
1009
1010         /* Return the sum of the return codes from the hook functions.
1011          */
1012         return total_retval;
1013 }
1014
1015
1016 int PerformNetprocHooks(struct CtdlMessage *msg, char *target_room)
1017 {
1018         struct NetprocFunctionHook *fcn;
1019         int total_retval = 0;
1020
1021         for (fcn = NetprocHookTable; fcn != NULL; fcn = fcn->next) {
1022                 total_retval = total_retval +
1023                         (*fcn->h_function_pointer) (msg, target_room);
1024         }
1025
1026         /* Return the sum of the return codes from the hook functions.
1027          * A nonzero return code will cause the message to *not* be imported.
1028          */
1029         return total_retval;
1030 }
1031
1032
1033 void PerformDeleteHooks(char *room, long msgnum)
1034 {
1035         struct DeleteFunctionHook *fcn;
1036
1037         for (fcn = DeleteHookTable; fcn != NULL; fcn = fcn->next) {
1038                 (*fcn->h_function_pointer) (room, msgnum);
1039         }
1040 }
1041
1042
1043
1044
1045
1046 int PerformXmsgHooks(char *sender, char *recp, char *msg)
1047 {
1048         struct XmsgFunctionHook *fcn;
1049         int total_sent = 0;
1050         int p;
1051
1052         for (p=0; p<MAX_XMSG_PRI; ++p) {
1053                 for (fcn = XmsgHookTable; fcn != NULL; fcn = fcn->next) {
1054                         if (fcn->order == p) {
1055                                 total_sent +=
1056                                         (*fcn->h_function_pointer)
1057                                                 (sender, recp, msg);
1058                         }
1059                 }
1060                 /* Break out of the loop if a higher-priority function
1061                  * successfully delivered the message.  This prevents duplicate
1062                  * deliveries to local users simultaneously signed onto
1063                  * remote services.
1064                  */
1065                 if (total_sent) break;
1066         }
1067         return total_sent;
1068 }
1069
1070 void CtdlRegisterMaintenanceThread(char *name, void *(*thread_proc)(void *arg))
1071 {
1072         struct MaintenanceThreadHook *newfcn;
1073
1074         newfcn = (struct MaintenanceThreadHook *)
1075             malloc(sizeof(struct MaintenanceThreadHook));
1076         newfcn->name = name;
1077         newfcn->next = MaintenanceThreadHookTable;
1078         newfcn->fcn_ptr = thread_proc;
1079         MaintenanceThreadHookTable = newfcn;
1080
1081         lprintf(CTDL_INFO, "Registered a new maintenance thread function\n");
1082 }
1083
1084
1085 /*
1086  * Dirty hack until we impliment a hook mechanism for this
1087  */
1088 void CtdlModuleStartCryptoMsgs(char *ok_response, char *nosup_response, char *error_response)
1089 {
1090 #ifdef HAVE_OPENSSL
1091         CtdlStartTLS (ok_response, nosup_response, error_response);
1092 #endif
1093 }