citadel/serv_extensions.c

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