citadel/serv_extensions.c

   1 /*
   2  * Citadel Extension Loader
   3  * Originally written by Brian Costello <btx@calyx.net>
   4  *
   5  * Copyright (c) 1987-2021 by the citadel.org team
   6  *
   7  * This program is open source software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License, version 3.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <stdio.h>
  19 #include <sys/stat.h>
  20 #include <libcitadel.h>
  21 #include "sysdep_decls.h"
  22 #include "modules/crypto/serv_crypto.h" /* Needed until a universal crypto startup hook is implimented for CtdlStartTLS */
  23 #include "serv_extensions.h"
  24 #include "ctdl_module.h"
  25 #include "config.h"
  26
  27
  28 /*
  29  * Structure defentitions for hook tables
  30  */
  31
  32 typedef struct FixedOutputHook FixedOutputHook;
  33 struct FixedOutputHook {
  34         FixedOutputHook *next;
  35         char content_type[64];
  36         void (*h_function_pointer) (char *, int);
  37 };
  38 FixedOutputHook *FixedOutputTable = NULL;
  39
  40
  41 /*
  42  * SessionFunctionHook extensions are used for any type of hook for which
  43  * the context in which it's being called (which is determined by the event
  44  * type) will make it obvious for the hook function to know where to look for
  45  * pertinent data.
  46  */
  47 typedef struct SessionFunctionHook SessionFunctionHook;
  48 struct SessionFunctionHook {
  49         SessionFunctionHook *next;
  50         int Priority;
  51         void (*h_function_pointer) (void);
  52         int eventtype;
  53 };
  54 SessionFunctionHook *SessionHookTable = NULL;
  55
  56
  57 /*
  58  * UserFunctionHook extensions are used for any type of hook which implements
  59  * an operation on a user or username (potentially) other than the one
  60  * operating the current session.
  61  */
  62 typedef struct UserFunctionHook UserFunctionHook;
  63 struct UserFunctionHook {
  64         UserFunctionHook *next;
  65         void (*h_function_pointer) (struct ctdluser *usbuf);
  66         int eventtype;
  67 };
  68 UserFunctionHook *UserHookTable = NULL;
  69
  70
  71 /*
  72  * MessageFunctionHook extensions are used for hooks which implement handlers
  73  * for various types of message operations (save, read, etc.)
  74  */
  75 typedef struct MessageFunctionHook MessageFunctionHook;
  76 struct MessageFunctionHook {
  77         MessageFunctionHook *next;
  78         int (*h_function_pointer) (struct CtdlMessage *msg, recptypes *recps);
  79         int eventtype;
  80 };
  81 MessageFunctionHook *MessageHookTable = NULL;
  82
  83
  84 /*
  85  * DeleteFunctionHook extensions are used for hooks which get called when a
  86  * message is about to be deleted.
  87  */
  88 typedef struct DeleteFunctionHook DeleteFunctionHook;
  89 struct DeleteFunctionHook {
  90         DeleteFunctionHook *next;
  91         void (*h_function_pointer) (char *target_room, long msgnum);
  92 };
  93 DeleteFunctionHook *DeleteHookTable = NULL;
  94
  95
  96 /*
  97  * ExpressMessageFunctionHook extensions are used for hooks which implement
  98  * the sending of an instant message through various channels.  Any function
  99  * registered should return the number of recipients to whom the message was
 100  * successfully transmitted.
 101  */
 102 typedef struct XmsgFunctionHook XmsgFunctionHook;
 103 struct XmsgFunctionHook {
 104         XmsgFunctionHook *next;
 105         int (*h_function_pointer) (char *, char *, char *, char *);
 106         int order;
 107 };
 108 XmsgFunctionHook *XmsgHookTable = NULL;
 109
 110
 111 /*
 112  * RoomFunctionHook extensions are used for hooks which impliment room
 113  * processing functions when new messages are added.
 114  */
 115 typedef struct RoomFunctionHook RoomFunctionHook;
 116 struct RoomFunctionHook {
 117         RoomFunctionHook *next;
 118         int (*fcn_ptr) (struct ctdlroom *);
 119 };
 120 RoomFunctionHook *RoomHookTable = NULL;
 121
 122
 123 typedef struct SearchFunctionHook SearchFunctionHook;
 124 struct SearchFunctionHook {
 125         SearchFunctionHook *next;
 126         void (*fcn_ptr) (int *, long **, const char *);
 127         char *name;
 128 };
 129 SearchFunctionHook *SearchFunctionHookTable = NULL;
 130
 131 ServiceFunctionHook *ServiceHookTable = NULL;
 132
 133 typedef struct ProtoFunctionHook ProtoFunctionHook;
 134 struct ProtoFunctionHook {
 135         void (*handler) (char *cmdbuf);
 136         const char *cmd;
 137         const char *desc;
 138 };
 139
 140 HashList *ProtoHookList = NULL;
 141
 142
 143 #define ERR_PORT (1 << 1)
 144
 145
 146 static StrBuf *portlist = NULL;
 147 static StrBuf *errormessages = NULL;
 148
 149
 150 long   DetailErrorFlags;
 151 ConstStr Empty = {HKEY("")};
 152 char *ErrSubject = "Startup Problems";
 153 ConstStr ErrGeneral[] = {
 154         {HKEY("Citadel had trouble on starting up. ")},
 155         {HKEY(" This means, Citadel won't be the service provider for a specific service you configured it to.\n\n"
 156               "If you don't want Citadel to provide these services, turn them off in WebCit via: ")},
 157         {HKEY("To make both ways actualy take place restart the citserver with \"sendcommand down\"\n\n"
 158               "The errors returned by the system were:\n")},
 159         {HKEY("You can recheck the above if you follow this faq item:\n"
 160               "http://www.citadel.org/doku.php?id=faq:mastering_your_os:net#netstat")}
 161 };
 162
 163 ConstStr ErrPortShort = { HKEY("We couldn't bind all ports you configured to be provided by Citadel Server.\n")};
 164 ConstStr ErrPortWhere = { HKEY("\"Admin->System Preferences->Network\".\n\nThe failed ports and sockets are: ")};
 165 ConstStr ErrPortHint  = { HKEY("If you want Citadel to provide you with that functionality, "
 166                                "check the output of \"netstat -lnp\" on Linux, or \"netstat -na\" on BSD"
 167                                " and disable the program that binds these ports.\n")};
 168
 169
 170 void LogPrintMessages(long err)
 171 {
 172         StrBuf *Message;
 173         StrBuf *List, *DetailList;
 174         ConstStr *Short, *Where, *Hint;
 175
 176
 177         Message = NewStrBufPlain(NULL, StrLength(portlist) + StrLength(errormessages));
 178
 179         DetailErrorFlags = DetailErrorFlags & ~err;
 180
 181         switch (err)
 182         {
 183         case ERR_PORT:
 184                 Short = &ErrPortShort;
 185                 Where = &ErrPortWhere;
 186                 Hint  = &ErrPortHint;
 187                 List  = portlist;
 188                 DetailList = errormessages;
 189                 break;
 190         default:
 191                 Short = &Empty;
 192                 Where = &Empty;
 193                 Hint  = &Empty;
 194                 List  = NULL;
 195                 DetailList = NULL;
 196         }
 197
 198         StrBufAppendBufPlain(Message, CKEY(ErrGeneral[0]), 0);
 199         StrBufAppendBufPlain(Message, CKEY(*Short), 0);
 200         StrBufAppendBufPlain(Message, CKEY(ErrGeneral[1]), 0);
 201         StrBufAppendBufPlain(Message, CKEY(*Where), 0);
 202         StrBufAppendBuf(Message, List, 0);
 203         StrBufAppendBufPlain(Message, HKEY("\n\n"), 0);
 204         StrBufAppendBufPlain(Message, CKEY(*Hint), 0);
 205         StrBufAppendBufPlain(Message, HKEY("\n\n"), 0);
 206         StrBufAppendBufPlain(Message, CKEY(ErrGeneral[2]), 0);
 207         StrBufAppendBuf(Message, DetailList, 0);
 208         StrBufAppendBufPlain(Message, HKEY("\n\n"), 0);
 209         StrBufAppendBufPlain(Message, CKEY(ErrGeneral[3]), 0);
 210
 211         syslog(LOG_ERR, "extensions: %s", ChrPtr(Message));
 212         syslog(LOG_ERR, "extensions: %s", ErrSubject);
 213         quickie_message("Citadel", NULL, NULL, AIDEROOM, ChrPtr(Message), FMT_FIXED, ErrSubject);
 214
 215         FreeStrBuf(&Message);
 216         FreeStrBuf(&List);
 217         FreeStrBuf(&DetailList);
 218 }
 219
 220
 221 void AddPortError(char *Port, char *ErrorMessage)
 222 {
 223         long len;
 224
 225         DetailErrorFlags |= ERR_PORT;
 226
 227         len = StrLength(errormessages);
 228         if (len > 0) StrBufAppendBufPlain(errormessages, HKEY("; "), 0);
 229         else errormessages = NewStrBuf();
 230         StrBufAppendBufPlain(errormessages, ErrorMessage, -1, 0);
 231
 232
 233         len = StrLength(portlist);
 234         if (len > 0) StrBufAppendBufPlain(portlist, HKEY(";"), 0);
 235         else portlist = NewStrBuf();
 236         StrBufAppendBufPlain(portlist, Port, -1, 0);
 237 }
 238
 239
 240 int DLoader_Exec_Cmd(char *cmdbuf)
 241 {
 242         void *vP;
 243         ProtoFunctionHook *p;
 244
 245         if (GetHash(ProtoHookList, cmdbuf, 4, &vP) && (vP != NULL)) {
 246                 p = (ProtoFunctionHook*) vP;
 247                 p->handler(&cmdbuf[5]);
 248                 return 1;
 249         }
 250         return 0;
 251 }
 252
 253
 254 void CtdlRegisterProtoHook(void (*handler) (char *), char *cmd, char *desc)
 255 {
 256         ProtoFunctionHook *p;
 257
 258         if (ProtoHookList == NULL)
 259                 ProtoHookList = NewHash (1, FourHash);
 260
 261
 262         p = (ProtoFunctionHook *)
 263                 malloc(sizeof(ProtoFunctionHook));
 264
 265         if (p == NULL) {
 266                 fprintf(stderr, "can't malloc new ProtoFunctionHook\n");
 267                 exit(EXIT_FAILURE);
 268         }
 269         p->handler = handler;
 270         p->cmd = cmd;
 271         p->desc = desc;
 272
 273         Put(ProtoHookList, cmd, 4, p, NULL);
 274         syslog(LOG_DEBUG, "extensions: registered server command %s (%s)", cmd, desc);
 275 }
 276
 277
 278 void CtdlRegisterSessionHook(void (*fcn_ptr) (void), int EventType, int Priority)
 279 {
 280         SessionFunctionHook *newfcn;
 281
 282         newfcn = (SessionFunctionHook *)
 283             malloc(sizeof(SessionFunctionHook));
 284         newfcn->Priority = Priority;
 285         newfcn->h_function_pointer = fcn_ptr;
 286         newfcn->eventtype = EventType;
 287
 288         SessionFunctionHook **pfcn;
 289         pfcn = &SessionHookTable;
 290         while ((*pfcn != NULL) &&
 291                ((*pfcn)->Priority < newfcn->Priority) &&
 292                ((*pfcn)->next != NULL))
 293                 pfcn = &(*pfcn)->next;
 294
 295         newfcn->next = *pfcn;
 296         *pfcn = newfcn;
 297
 298         syslog(LOG_DEBUG, "extensions: registered a new session function (type %d Priority %d)", EventType, Priority);
 299 }
 300
 301
 302 void CtdlUnregisterSessionHook(void (*fcn_ptr) (void), int EventType)
 303 {
 304         SessionFunctionHook *cur, *p, *last;
 305         last = NULL;
 306         cur = SessionHookTable;
 307         while  (cur != NULL) {
 308                 if ((fcn_ptr == cur->h_function_pointer) &&
 309                     (EventType == cur->eventtype))
 310                 {
 311                         syslog(LOG_DEBUG, "extensions: unregistered session function (type %d)", EventType);
 312                         p = cur->next;
 313
 314                         free(cur);
 315                         cur = NULL;
 316
 317                         if (last != NULL)
 318                                 last->next = p;
 319                         else
 320                                 SessionHookTable = p;
 321                         cur = p;
 322                 }
 323                 else {
 324                         last = cur;
 325                         cur = cur->next;
 326                 }
 327         }
 328 }
 329
 330
 331 void CtdlRegisterUserHook(void (*fcn_ptr) (ctdluser *), int EventType)
 332 {
 333
 334         UserFunctionHook *newfcn;
 335
 336         newfcn = (UserFunctionHook *)
 337             malloc(sizeof(UserFunctionHook));
 338         newfcn->next = UserHookTable;
 339         newfcn->h_function_pointer = fcn_ptr;
 340         newfcn->eventtype = EventType;
 341         UserHookTable = newfcn;
 342
 343         syslog(LOG_DEBUG, "extensions: registered a new user function (type %d)",
 344                    EventType);
 345 }
 346
 347
 348 void CtdlUnregisterUserHook(void (*fcn_ptr) (struct ctdluser *), int EventType)
 349 {
 350         UserFunctionHook *cur, *p, *last;
 351         last = NULL;
 352         cur = UserHookTable;
 353         while (cur != NULL) {
 354                 if ((fcn_ptr == cur->h_function_pointer) &&
 355                     (EventType == cur->eventtype))
 356                 {
 357                         syslog(LOG_DEBUG, "extensions: unregistered user function (type %d)", EventType);
 358                         p = cur->next;
 359
 360                         free(cur);
 361                         cur = NULL;
 362
 363                         if (last != NULL)
 364                                 last->next = p;
 365                         else
 366                                 UserHookTable = p;
 367                         cur = p;
 368                 }
 369                 else {
 370                         last = cur;
 371                         cur = cur->next;
 372                 }
 373         }
 374 }
 375
 376
 377 void CtdlRegisterMessageHook(int (*handler)(struct CtdlMessage *, recptypes *), int EventType)
 378 {
 379
 380         MessageFunctionHook *newfcn;
 381
 382         newfcn = (MessageFunctionHook *)
 383             malloc(sizeof(MessageFunctionHook));
 384         newfcn->next = MessageHookTable;
 385         newfcn->h_function_pointer = handler;
 386         newfcn->eventtype = EventType;
 387         MessageHookTable = newfcn;
 388
 389         syslog(LOG_DEBUG, "extensions: registered a new message function (type %d)", EventType);
 390 }
 391
 392
 393 void CtdlUnregisterMessageHook(int (*handler)(struct CtdlMessage *, recptypes *), int EventType)
 394 {
 395         MessageFunctionHook *cur, *p, *last;
 396         last = NULL;
 397         cur = MessageHookTable;
 398         while (cur != NULL) {
 399                 if ((handler == cur->h_function_pointer) &&
 400                     (EventType == cur->eventtype))
 401                 {
 402                         syslog(LOG_DEBUG, "extensions: unregistered message function (type %d)", EventType);
 403                         p = cur->next;
 404                         free(cur);
 405                         cur = NULL;
 406
 407                         if (last != NULL)
 408                                 last->next = p;
 409                         else
 410                                 MessageHookTable = p;
 411                         cur = p;
 412                 }
 413                 else {
 414                         last = cur;
 415                         cur = cur->next;
 416                 }
 417         }
 418 }
 419
 420
 421 void CtdlRegisterRoomHook(int (*fcn_ptr)(struct ctdlroom *))
 422 {
 423         RoomFunctionHook *newfcn;
 424
 425         newfcn = (RoomFunctionHook *)
 426             malloc(sizeof(RoomFunctionHook));
 427         newfcn->next = RoomHookTable;
 428         newfcn->fcn_ptr = fcn_ptr;
 429         RoomHookTable = newfcn;
 430
 431         syslog(LOG_DEBUG, "extensions: registered a new room function");
 432 }
 433
 434
 435 void CtdlUnregisterRoomHook(int (*fcn_ptr)(struct ctdlroom *))
 436 {
 437         RoomFunctionHook *cur, *p, *last;
 438         last = NULL;
 439         cur = RoomHookTable;
 440         while (cur != NULL)
 441         {
 442                 if (fcn_ptr == cur->fcn_ptr) {
 443                         syslog(LOG_DEBUG, "extensions: unregistered room function");
 444                         p = cur->next;
 445
 446                         free(cur);
 447                         cur = NULL;
 448
 449                         if (last != NULL)
 450                                 last->next = p;
 451                         else
 452                                 RoomHookTable = p;
 453                         cur = p;
 454                 }
 455                 else {
 456                         last = cur;
 457                         cur = cur->next;
 458                 }
 459         }
 460 }
 461
 462
 463 void CtdlRegisterDeleteHook(void (*handler)(char *, long) )
 464 {
 465         DeleteFunctionHook *newfcn;
 466
 467         newfcn = (DeleteFunctionHook *)
 468             malloc(sizeof(DeleteFunctionHook));
 469         newfcn->next = DeleteHookTable;
 470         newfcn->h_function_pointer = handler;
 471         DeleteHookTable = newfcn;
 472
 473         syslog(LOG_DEBUG, "extensions: registered a new delete function");
 474 }
 475
 476
 477 void CtdlUnregisterDeleteHook(void (*handler)(char *, long) )
 478 {
 479         DeleteFunctionHook *cur, *p, *last;
 480
 481         last = NULL;
 482         cur = DeleteHookTable;
 483         while (cur != NULL) {
 484                 if (handler == cur->h_function_pointer )
 485                 {
 486                         syslog(LOG_DEBUG, "extensions: unregistered delete function");
 487                         p = cur->next;
 488                         free(cur);
 489
 490                         if (last != NULL)
 491                                 last->next = p;
 492                         else
 493                                 DeleteHookTable = p;
 494
 495                         cur = p;
 496                 }
 497                 else {
 498                         last = cur;
 499                         cur = cur->next;
 500                 }
 501         }
 502 }
 503
 504
 505 void CtdlRegisterFixedOutputHook(char *content_type, void (*handler)(char *, int) )
 506 {
 507         FixedOutputHook *newfcn;
 508
 509         newfcn = (FixedOutputHook *)
 510             malloc(sizeof(FixedOutputHook));
 511         newfcn->next = FixedOutputTable;
 512         newfcn->h_function_pointer = handler;
 513         safestrncpy(newfcn->content_type, content_type, sizeof newfcn->content_type);
 514         FixedOutputTable = newfcn;
 515
 516         syslog(LOG_DEBUG, "extensions: registered a new fixed output function for %s", newfcn->content_type);
 517 }
 518
 519
 520 void CtdlUnregisterFixedOutputHook(char *content_type)
 521 {
 522         FixedOutputHook *cur, *p, *last;
 523
 524         last = NULL;
 525         cur = FixedOutputTable;
 526         while (cur != NULL) {
 527                 /* This will also remove duplicates if any */
 528                 if (!strcasecmp(content_type, cur->content_type)) {
 529                         syslog(LOG_DEBUG, "extensions: unregistered fixed output function for %s", content_type);
 530                         p = cur->next;
 531                         free(cur);
 532
 533                         if (last != NULL)
 534                                 last->next = p;
 535                         else
 536                                 FixedOutputTable = p;
 537
 538                         cur = p;
 539                 }
 540                 else
 541                 {
 542                         last = cur;
 543                         cur = cur->next;
 544                 }
 545         }
 546 }
 547
 548
 549 /* returns nonzero if we found a hook and used it */
 550 int PerformFixedOutputHooks(char *content_type, char *content, int content_length)
 551 {
 552         FixedOutputHook *fcn;
 553
 554         for (fcn = FixedOutputTable; fcn != NULL; fcn = fcn->next) {
 555                 if (!strcasecmp(content_type, fcn->content_type)) {
 556                         (*fcn->h_function_pointer) (content, content_length);
 557                         return(1);
 558                 }
 559         }
 560         return(0);
 561 }
 562
 563
 564 void CtdlRegisterXmsgHook(int (*fcn_ptr) (char *, char *, char *, char *), int order)
 565 {
 566
 567         XmsgFunctionHook *newfcn;
 568
 569         newfcn = (XmsgFunctionHook *) malloc(sizeof(XmsgFunctionHook));
 570         newfcn->next = XmsgHookTable;
 571         newfcn->order = order;
 572         newfcn->h_function_pointer = fcn_ptr;
 573         XmsgHookTable = newfcn;
 574         syslog(LOG_DEBUG, "extensions: registered a new x-msg function (priority %d)", order);
 575 }
 576
 577
 578 void CtdlUnregisterXmsgHook(int (*fcn_ptr) (char *, char *, char *, char *), int order)
 579 {
 580         XmsgFunctionHook *cur, *p, *last;
 581
 582         last = NULL;
 583         cur = XmsgHookTable;
 584         while (cur != NULL) {
 585                 /* This will also remove duplicates if any */
 586                 if (fcn_ptr == cur->h_function_pointer &&
 587                     order == cur->order) {
 588                         syslog(LOG_DEBUG, "extensions: unregistered x-msg function (priority %d)", order);
 589                         p = cur->next;
 590                         free(cur);
 591
 592                         if (last != NULL) {
 593                                 last->next = p;
 594                         }
 595                         else {
 596                                 XmsgHookTable = p;
 597                         }
 598                         cur = p;
 599                 }
 600                 else {
 601                         last = cur;
 602                         cur = cur->next;
 603                 }
 604         }
 605 }
 606
 607
 608 void CtdlRegisterServiceHook(int tcp_port,
 609                              char *sockpath,
 610                              void (*h_greeting_function) (void),
 611                              void (*h_command_function) (void),
 612                              void (*h_async_function) (void),
 613                              const char *ServiceName)
 614 {
 615         ServiceFunctionHook *newfcn;
 616         char *message;
 617
 618         newfcn = (ServiceFunctionHook *) malloc(sizeof(ServiceFunctionHook));
 619         message = (char*) malloc (SIZ + SIZ);
 620
 621         newfcn->next = ServiceHookTable;
 622         newfcn->tcp_port = tcp_port;
 623         newfcn->sockpath = sockpath;
 624         newfcn->h_greeting_function = h_greeting_function;
 625         newfcn->h_command_function = h_command_function;
 626         newfcn->h_async_function = h_async_function;
 627         newfcn->ServiceName = ServiceName;
 628
 629         if (sockpath != NULL) {
 630                 newfcn->msock = ctdl_uds_server(sockpath, CtdlGetConfigInt("c_maxsessions"));
 631                 snprintf(message, SIZ, "extensions: unix domain socket '%s': ", sockpath);
 632         }
 633         else if (tcp_port <= 0) {       /* port -1 to disable */
 634                 syslog(LOG_INFO, "extensions: service %s has been manually disabled, skipping", ServiceName);
 635                 free (message);
 636                 free(newfcn);
 637                 return;
 638         }
 639         else {
 640                 newfcn->msock = ctdl_tcp_server(CtdlGetConfigStr("c_ip_addr"), tcp_port, CtdlGetConfigInt("c_maxsessions"));
 641                 snprintf(message, SIZ, "extensions: TCP port %s:%d: (%s) ",
 642                          CtdlGetConfigStr("c_ip_addr"), tcp_port, ServiceName);
 643         }
 644
 645         if (newfcn->msock > 0) {
 646                 ServiceHookTable = newfcn;
 647                 strcat(message, "registered.");
 648                 syslog(LOG_INFO, "%s", message);
 649         }
 650         else {
 651                 AddPortError(message, "failed");
 652                 strcat(message, "FAILED.");
 653                 syslog(LOG_ERR, "%s", message);
 654                 free(newfcn);
 655         }
 656         free(message);
 657 }
 658
 659
 660 void CtdlUnregisterServiceHook(int tcp_port, char *sockpath,
 661                         void (*h_greeting_function) (void),
 662                         void (*h_command_function) (void),
 663                         void (*h_async_function) (void)
 664                         )
 665 {
 666         ServiceFunctionHook *cur, *p, *last;
 667
 668         last = NULL;
 669         cur = ServiceHookTable;
 670         while (cur != NULL) {
 671                 /* This will also remove duplicates if any */
 672                 if (h_greeting_function == cur->h_greeting_function &&
 673                     h_command_function == cur->h_command_function &&
 674                     h_async_function == cur->h_async_function &&
 675                     tcp_port == cur->tcp_port &&
 676                     !(sockpath && cur->sockpath && strcmp(sockpath, cur->sockpath)) )
 677                 {
 678                         if (cur->msock > 0)
 679                                 close(cur->msock);
 680                         if (sockpath) {
 681                                 syslog(LOG_INFO, "extensions: closed UNIX domain socket %s", sockpath);
 682                                 unlink(sockpath);
 683                         } else if (tcp_port) {
 684                                 syslog(LOG_INFO, "extensions: closed TCP port %d", tcp_port);
 685                         } else {
 686                                 syslog(LOG_INFO, "extensions: unregistered service \"%s\"", cur->ServiceName);
 687                         }
 688                         p = cur->next;
 689                         free(cur);
 690                         if (last != NULL)
 691                                 last->next = p;
 692                         else
 693                                 ServiceHookTable = p;
 694                         cur = p;
 695                 }
 696                 else {
 697                         last = cur;
 698                         cur = cur->next;
 699                 }
 700         }
 701 }
 702
 703
 704 void CtdlShutdownServiceHooks(void)
 705 {
 706         /* sort of a duplicate of close_masters() but called earlier */
 707         ServiceFunctionHook *cur;
 708
 709         cur = ServiceHookTable;
 710         while (cur != NULL)
 711         {
 712                 if (cur->msock != -1)
 713                 {
 714                         close(cur->msock);
 715                         cur->msock = -1;
 716                         if (cur->sockpath != NULL){
 717                                 syslog(LOG_INFO, "extensions: [%s] Closed UNIX domain socket %s", cur->ServiceName, cur->sockpath);
 718                                 unlink(cur->sockpath);
 719                         } else {
 720                                 syslog(LOG_INFO, "extensions: [%s] closing service", cur->ServiceName);
 721                         }
 722                 }
 723                 cur = cur->next;
 724         }
 725 }
 726
 727
 728 void CtdlRegisterSearchFuncHook(void (*fcn_ptr)(int *, long **, const char *), char *name)
 729 {
 730         SearchFunctionHook *newfcn;
 731
 732         if (!name || !fcn_ptr) {
 733                 return;
 734         }
 735
 736         newfcn = (SearchFunctionHook *)
 737             malloc(sizeof(SearchFunctionHook));
 738         newfcn->next = SearchFunctionHookTable;
 739         newfcn->name = name;
 740         newfcn->fcn_ptr = fcn_ptr;
 741         SearchFunctionHookTable = newfcn;
 742
 743         syslog(LOG_DEBUG, "extensions: registered a new search function (%s)", name);
 744 }
 745
 746 void CtdlUnregisterSearchFuncHook(void (*fcn_ptr)(int *, long **, const char *), char *name)
 747 {
 748         SearchFunctionHook *cur, *p, *last;
 749
 750         last = NULL;
 751         cur = SearchFunctionHookTable;
 752         while (cur != NULL) {
 753                 if (fcn_ptr &&
 754                     (cur->fcn_ptr == fcn_ptr) &&
 755                     name && !strcmp(name, cur->name))
 756                 {
 757                         syslog(LOG_DEBUG, "extensions: unregistered search function(%s)", name);
 758                         p = cur->next;
 759                         free (cur);
 760                         if (last != NULL)
 761                                 last->next = p;
 762                         else
 763                                 SearchFunctionHookTable = p;
 764                         cur = p;
 765                 }
 766                 else {
 767                         last = cur;
 768                         cur = cur->next;
 769                 }
 770         }
 771 }
 772
 773
 774 void CtdlModuleDoSearch(int *num_msgs, long **search_msgs, const char *search_string, const char *func_name)
 775 {
 776         SearchFunctionHook *fcn = NULL;
 777
 778         for (fcn = SearchFunctionHookTable; fcn != NULL; fcn = fcn->next) {
 779                 if (!func_name || !strcmp(func_name, fcn->name)) {
 780                         (*fcn->fcn_ptr) (num_msgs, search_msgs, search_string);
 781                         return;
 782                 }
 783         }
 784         *num_msgs = 0;
 785 }
 786
 787
 788 void PerformSessionHooks(int EventType)
 789 {
 790         SessionFunctionHook *fcn = NULL;
 791
 792         for (fcn = SessionHookTable; fcn != NULL; fcn = fcn->next) {
 793                 if (fcn->eventtype == EventType) {
 794                         if (EventType == EVT_TIMER) {
 795                                 pthread_setspecific(MyConKey, NULL);    /* for every hook */
 796                         }
 797                         (*fcn->h_function_pointer) ();
 798                 }
 799         }
 800 }
 801
 802 void PerformUserHooks(ctdluser *usbuf, int EventType)
 803 {
 804         UserFunctionHook *fcn = NULL;
 805
 806         for (fcn = UserHookTable; fcn != NULL; fcn = fcn->next) {
 807                 if (fcn->eventtype == EventType) {
 808                         (*fcn->h_function_pointer) (usbuf);
 809                 }
 810         }
 811 }
 812
 813 int PerformMessageHooks(struct CtdlMessage *msg, recptypes *recps, int EventType)
 814 {
 815         MessageFunctionHook *fcn = NULL;
 816         int total_retval = 0;
 817
 818         /* Other code may elect to protect this message from server-side
 819          * handlers; if this is the case, don't do anything.
 820          */
 821         if (msg->cm_flags & CM_SKIP_HOOKS) {
 822                 return(0);
 823         }
 824
 825         /* Otherwise, run all the hooks appropriate to this event type.
 826          */
 827         for (fcn = MessageHookTable; fcn != NULL; fcn = fcn->next) {
 828                 if (fcn->eventtype == EventType) {
 829                         total_retval = total_retval + (*fcn->h_function_pointer) (msg, recps);
 830                 }
 831         }
 832
 833         /* Return the sum of the return codes from the hook functions.  If
 834          * this is an EVT_BEFORESAVE event, a nonzero return code will cause
 835          * the save operation to abort.
 836          */
 837         return total_retval;
 838 }
 839
 840
 841 int PerformRoomHooks(struct ctdlroom *target_room)
 842 {
 843         RoomFunctionHook *fcn;
 844         int total_retval = 0;
 845
 846         syslog(LOG_DEBUG, "extensions: performing room hooks for <%s>", target_room->QRname);
 847
 848         for (fcn = RoomHookTable; fcn != NULL; fcn = fcn->next) {
 849                 total_retval = total_retval + (*fcn->fcn_ptr) (target_room);
 850         }
 851
 852         /* Return the sum of the return codes from the hook functions.
 853          */
 854         return total_retval;
 855 }
 856
 857
 858 void PerformDeleteHooks(char *room, long msgnum)
 859 {
 860         DeleteFunctionHook *fcn;
 861
 862         for (fcn = DeleteHookTable; fcn != NULL; fcn = fcn->next) {
 863                 (*fcn->h_function_pointer) (room, msgnum);
 864         }
 865 }
 866
 867
 868 int PerformXmsgHooks(char *sender, char *sender_email, char *recp, char *msg)
 869 {
 870         XmsgFunctionHook *fcn;
 871         int total_sent = 0;
 872         int p;
 873
 874         for (p=0; p<MAX_XMSG_PRI; ++p) {
 875                 for (fcn = XmsgHookTable; fcn != NULL; fcn = fcn->next) {
 876                         if (fcn->order == p) {
 877                                 total_sent +=
 878                                         (*fcn->h_function_pointer)
 879                                                 (sender, sender_email, recp, msg);
 880                         }
 881                 }
 882                 /* Break out of the loop if a higher-priority function
 883                  * successfully delivered the message.  This prevents duplicate
 884                  * deliveries to local users simultaneously signed onto
 885                  * remote services.
 886                  */
 887                 if (total_sent) break;
 888         }
 889         return total_sent;
 890 }
 891
 892
 893 /*
 894  * Dirty hack until we impliment a hook mechanism for this
 895  */
 896 void CtdlModuleStartCryptoMsgs(char *ok_response, char *nosup_response, char *error_response)
 897 {
 898 #ifdef HAVE_OPENSSL
 899         CtdlStartTLS (ok_response, nosup_response, error_response);
 900 #endif
 901 }
 902
 903
 904 CTDL_MODULE_INIT(modules)
 905 {
 906         if (!threading) {
 907         }
 908         return "modules";
 909 }