citadel/modules/instmsg/serv_instmsg.c

   1 /*
   2  * This module handles instant messaging between users.
   3  *
   4  * Copyright (c) 1987-2015 by the citadel.org team
   5  *
   6  * This program is open source software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 3.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include "sysdep.h"
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <stdio.h>
  19 #include <fcntl.h>
  20 #include <signal.h>
  21 #include <pwd.h>
  22 #include <errno.h>
  23 #include <sys/types.h>
  24
  25 #if TIME_WITH_SYS_TIME
  26 # include <sys/time.h>
  27 # include <time.h>
  28 #else
  29 # if HAVE_SYS_TIME_H
  30 #  include <sys/time.h>
  31 # else
  32 #  include <time.h>
  33 # endif
  34 #endif
  35
  36 #include <sys/wait.h>
  37 #include <string.h>
  38 #include <limits.h>
  39 #include <libcitadel.h>
  40 #include "citadel.h"
  41 #include "server.h"
  42 #include "serv_instmsg.h"
  43 #include "citserver.h"
  44 #include "support.h"
  45 #include "config.h"
  46 #include "msgbase.h"
  47 #include "user_ops.h"
  48 #include "ctdl_module.h"
  49
  50 struct imlog {
  51         struct imlog *next;
  52         long usernums[2];
  53         char usernames[2][128];
  54         time_t lastmsg;
  55         int last_serial;
  56         StrBuf *conversation;
  57 };
  58
  59 struct imlog *imlist = NULL;
  60
  61 /*
  62  * This function handles the logging of instant messages to disk.
  63  */
  64 void log_instant_message(struct CitContext *me, struct CitContext *them, char *msgtext, int serial_number)
  65 {
  66         long usernums[2];
  67         long t;
  68         struct imlog *iptr = NULL;
  69         struct imlog *this_im = NULL;
  70
  71         memset(usernums, 0, sizeof usernums);
  72         usernums[0] = me->user.usernum;
  73         usernums[1] = them->user.usernum;
  74
  75         /* Always put the lower user number first, so we can use the array as a hash value which
  76          * represents a pair of users.  For a broadcast message one of the users will be 0.
  77          */
  78         if (usernums[0] > usernums[1]) {
  79                 t = usernums[0];
  80                 usernums[0] = usernums[1];
  81                 usernums[1] = t;
  82         }
  83
  84         begin_critical_section(S_IM_LOGS);
  85
  86         /* Look for an existing conversation in the hash table.
  87          * If not found, create a new one.
  88          */
  89
  90         this_im = NULL;
  91         for (iptr = imlist; iptr != NULL; iptr = iptr->next) {
  92                 if ((iptr->usernums[0] == usernums[0]) && (iptr->usernums[1] == usernums[1])) {
  93                         /* Existing conversation */
  94                         this_im = iptr;
  95                 }
  96         }
  97         if (this_im == NULL) {
  98                 /* New conversation */
  99                 this_im = malloc(sizeof(struct imlog));
 100                 memset(this_im, 0, sizeof (struct imlog));
 101                 this_im->usernums[0] = usernums[0];
 102                 this_im->usernums[1] = usernums[1];
 103                 /* usernames[] and usernums[] might not be in the same order.  This is not an error. */
 104                 if (me) {
 105                         safestrncpy(this_im->usernames[0], me->user.fullname, sizeof this_im->usernames[0]);
 106                 }
 107                 if (them) {
 108                         safestrncpy(this_im->usernames[1], them->user.fullname, sizeof this_im->usernames[1]);
 109                 }
 110                 this_im->conversation = NewStrBuf();
 111                 this_im->next = imlist;
 112                 imlist = this_im;
 113                 StrBufAppendBufPlain(this_im->conversation, HKEY(
 114                         "<html><body>\r\n"
 115                         ), 0);
 116         }
 117
 118
 119         /* Since it's possible for this function to get called more than once if a user is logged
 120          * in on multiple sessions, we use the message's serial number to keep track of whether
 121          * we've already logged it.
 122          */
 123         if (this_im->last_serial != serial_number)
 124         {
 125                 this_im->lastmsg = time(NULL);          /* Touch the timestamp so we know when to flush */
 126                 this_im->last_serial = serial_number;
 127                 StrBufAppendBufPlain(this_im->conversation, HKEY("<p><b>"), 0);
 128                 StrBufAppendBufPlain(this_im->conversation, me->user.fullname, -1, 0);
 129                 StrBufAppendBufPlain(this_im->conversation, HKEY(":</b> "), 0);
 130                 StrEscAppend(this_im->conversation, NULL, msgtext, 0, 0);
 131                 StrBufAppendBufPlain(this_im->conversation, HKEY("</p>\r\n"), 0);
 132         }
 133         end_critical_section(S_IM_LOGS);
 134 }
 135
 136
 137 /*
 138  * Delete any remaining instant messages
 139  */
 140 void delete_instant_messages(void) {
 141         struct ExpressMessage *ptr;
 142
 143         begin_critical_section(S_SESSION_TABLE);
 144         while (CC->FirstExpressMessage != NULL) {
 145                 ptr = CC->FirstExpressMessage->next;
 146                 if (CC->FirstExpressMessage->text != NULL)
 147                         free(CC->FirstExpressMessage->text);
 148                 free(CC->FirstExpressMessage);
 149                 CC->FirstExpressMessage = ptr;
 150         }
 151         end_critical_section(S_SESSION_TABLE);
 152 }
 153
 154
 155
 156 /*
 157  * Retrieve instant messages
 158  */
 159 void cmd_gexp(char *argbuf) {
 160         struct ExpressMessage *ptr;
 161
 162         if (CC->FirstExpressMessage == NULL) {
 163                 cprintf("%d No instant messages waiting.\n", ERROR + MESSAGE_NOT_FOUND);
 164                 return;
 165         }
 166
 167         begin_critical_section(S_SESSION_TABLE);
 168         ptr = CC->FirstExpressMessage;
 169         CC->FirstExpressMessage = CC->FirstExpressMessage->next;
 170         end_critical_section(S_SESSION_TABLE);
 171
 172         cprintf("%d %d|%ld|%d|%s|%s|%s\n",
 173                 LISTING_FOLLOWS,
 174                 ((ptr->next != NULL) ? 1 : 0),          /* more msgs? */
 175                 (long)ptr->timestamp,                   /* time sent */
 176                 ptr->flags,                             /* flags */
 177                 ptr->sender,                            /* sender of msg */
 178                 CtdlGetConfigStr("c_nodename"),         /* static for now (and possibly deprecated) */
 179                 ptr->sender_email                       /* email or jid of sender */
 180         );
 181
 182         if (ptr->text != NULL) {
 183                 memfmout(ptr->text, "\n");
 184                 free(ptr->text);
 185         }
 186
 187         cprintf("000\n");
 188         free(ptr);
 189 }
 190
 191 /*
 192  * Asynchronously deliver instant messages
 193  */
 194 void cmd_gexp_async(void) {
 195
 196         /* Only do this if the session can handle asynchronous protocol */
 197         if (CC->is_async == 0) return;
 198
 199         /* And don't do it if there's nothing to send. */
 200         if (CC->FirstExpressMessage == NULL) return;
 201
 202         cprintf("%d instant msg\n", ASYNC_MSG + ASYNC_GEXP);
 203 }
 204
 205 /*
 206  * Back end support function for send_instant_message() and company
 207  */
 208 void add_xmsg_to_context(struct CitContext *ccptr, struct ExpressMessage *newmsg)
 209 {
 210         struct ExpressMessage *findend;
 211
 212         if (ccptr->FirstExpressMessage == NULL) {
 213                 ccptr->FirstExpressMessage = newmsg;
 214         }
 215         else {
 216                 findend = ccptr->FirstExpressMessage;
 217                 while (findend->next != NULL) {
 218                         findend = findend->next;
 219                 }
 220                 findend->next = newmsg;
 221         }
 222
 223         /* If the target context is a session which can handle asynchronous
 224          * messages, go ahead and set the flag for that.
 225          */
 226         set_async_waiting(ccptr);
 227 }
 228
 229
 230
 231
 232 /*
 233  * This is the back end to the instant message sending function.
 234  * Returns the number of users to which the message was sent.
 235  * Sending a zero-length message tests for recipients without sending messages.
 236  */
 237 int send_instant_message(char *lun, char *lem, char *x_user, char *x_msg)
 238 {
 239         int message_sent = 0;           /* number of successful sends */
 240         struct CitContext *ccptr;
 241         struct ExpressMessage *newmsg = NULL;
 242         char *un;
 243         int do_send = 0;                /* 1 = send message; 0 = only check for valid recipient */
 244         static int serial_number = 0;   /* this keeps messages from getting logged twice */
 245
 246         if (!IsEmptyStr(x_msg)) {
 247                 do_send = 1;
 248         }
 249
 250         /* find the target user's context and append the message */
 251         begin_critical_section(S_SESSION_TABLE);
 252         ++serial_number;
 253         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 254
 255                 if (ccptr->fake_username[0]) {
 256                         un = ccptr->fake_username;
 257                 }
 258                 else {
 259                         un = ccptr->user.fullname;
 260                 }
 261
 262                 if ( ((!strcasecmp(un, x_user))
 263                     || (!strcasecmp(x_user, "broadcast")))
 264                     && (ccptr->can_receive_im)
 265                     && ((ccptr->disable_exp == 0)
 266                     || (CC->user.axlevel >= AxAideU)) ) {
 267                         if (do_send) {
 268                                 newmsg = (struct ExpressMessage *) malloc(sizeof (struct ExpressMessage));
 269                                 memset(newmsg, 0, sizeof (struct ExpressMessage));
 270                                 time(&(newmsg->timestamp));
 271                                 safestrncpy(newmsg->sender, lun, sizeof newmsg->sender);
 272                                 safestrncpy(newmsg->sender_email, lem, sizeof newmsg->sender_email);
 273                                 if (!strcasecmp(x_user, "broadcast")) {
 274                                         newmsg->flags |= EM_BROADCAST;
 275                                 }
 276                                 newmsg->text = strdup(x_msg);
 277
 278                                 add_xmsg_to_context(ccptr, newmsg);
 279
 280                                 /* and log it ... */
 281                                 if (ccptr != CC) {
 282                                         log_instant_message(CC, ccptr, newmsg->text, serial_number);
 283                                 }
 284                         }
 285                         ++message_sent;
 286                 }
 287         }
 288         end_critical_section(S_SESSION_TABLE);
 289         return (message_sent);
 290 }
 291
 292 /*
 293  * send instant messages
 294  */
 295 void cmd_sexp(char *argbuf)
 296 {
 297         int message_sent = 0;
 298         char x_user[USERNAME_SIZE];
 299         char x_msg[1024];
 300         char *lun;
 301         char *lem;
 302         char *x_big_msgbuf = NULL;
 303
 304         if ((!(CC->logged_in)) && (!(CC->internal_pgm))) {
 305                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 306                 return;
 307         }
 308         if (CC->fake_username[0])
 309                 lun = CC->fake_username;
 310         else
 311                 lun = CC->user.fullname;
 312
 313         lem = CC->cs_inet_email;
 314
 315         extract_token(x_user, argbuf, 0, '|', sizeof x_user);
 316         extract_token(x_msg, argbuf, 1, '|', sizeof x_msg);
 317
 318         if (!x_user[0]) {
 319                 cprintf("%d You were not previously paged.\n", ERROR + NO_SUCH_USER);
 320                 return;
 321         }
 322         if ((!strcasecmp(x_user, "broadcast")) && (CC->user.axlevel < AxAideU)) {
 323                 cprintf("%d Higher access required to send a broadcast.\n",
 324                         ERROR + HIGHER_ACCESS_REQUIRED);
 325                 return;
 326         }
 327         /* This loop handles text-transfer pages */
 328         if (!strcmp(x_msg, "-")) {
 329                 message_sent = PerformXmsgHooks(lun, lem, x_user, "");
 330                 if (message_sent == 0) {
 331                         if (CtdlGetUser(NULL, x_user))
 332                                 cprintf("%d '%s' does not exist.\n",
 333                                                 ERROR + NO_SUCH_USER, x_user);
 334                         else
 335                                 cprintf("%d '%s' is not logged in "
 336                                                 "or is not accepting pages.\n",
 337                                                 ERROR + RESOURCE_NOT_OPEN, x_user);
 338                         return;
 339                 }
 340                 unbuffer_output();
 341                 cprintf("%d Transmit message (will deliver to %d users)\n",
 342                         SEND_LISTING, message_sent);
 343                 x_big_msgbuf = malloc(SIZ);
 344                 memset(x_big_msgbuf, 0, SIZ);
 345                 while (client_getln(x_msg, sizeof x_msg) >= 0 && strcmp(x_msg, "000")) {
 346                         x_big_msgbuf = realloc(x_big_msgbuf,
 347                                strlen(x_big_msgbuf) + strlen(x_msg) + 4);
 348                         if (!IsEmptyStr(x_big_msgbuf))
 349                            if (x_big_msgbuf[strlen(x_big_msgbuf)] != '\n')
 350                                 strcat(x_big_msgbuf, "\n");
 351                         strcat(x_big_msgbuf, x_msg);
 352                 }
 353                 PerformXmsgHooks(lun, lem, x_user, x_big_msgbuf);
 354                 free(x_big_msgbuf);
 355
 356                 /* This loop handles inline pages */
 357         } else {
 358                 message_sent = PerformXmsgHooks(lun, lem, x_user, x_msg);
 359
 360                 if (message_sent > 0) {
 361                         if (!IsEmptyStr(x_msg))
 362                                 cprintf("%d Message sent", CIT_OK);
 363                         else
 364                                 cprintf("%d Ok to send message", CIT_OK);
 365                         if (message_sent > 1)
 366                                 cprintf(" to %d users", message_sent);
 367                         cprintf(".\n");
 368                 } else {
 369                         if (CtdlGetUser(NULL, x_user))
 370                                 cprintf("%d '%s' does not exist.\n",
 371                                                 ERROR + NO_SUCH_USER, x_user);
 372                         else
 373                                 cprintf("%d '%s' is not logged in "
 374                                                 "or is not accepting pages.\n",
 375                                                 ERROR + RESOURCE_NOT_OPEN, x_user);
 376                 }
 377
 378
 379         }
 380 }
 381
 382
 383
 384 /*
 385  * Enter or exit paging-disabled mode
 386  */
 387 void cmd_dexp(char *argbuf)
 388 {
 389         int new_state;
 390
 391         if (CtdlAccessCheck(ac_logged_in)) return;
 392
 393         new_state = extract_int(argbuf, 0);
 394         if ((new_state == 0) || (new_state == 1)) {
 395                 CC->disable_exp = new_state;
 396         }
 397
 398         cprintf("%d %d\n", CIT_OK, CC->disable_exp);
 399 }
 400
 401
 402 /*
 403  * Request client termination
 404  */
 405 void cmd_reqt(char *argbuf) {
 406         struct CitContext *ccptr;
 407         int sessions = 0;
 408         int which_session;
 409         struct ExpressMessage *newmsg;
 410
 411         if (CtdlAccessCheck(ac_aide)) return;
 412         which_session = extract_int(argbuf, 0);
 413
 414         begin_critical_section(S_SESSION_TABLE);
 415         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 416                 if ((ccptr->cs_pid == which_session) || (which_session == 0)) {
 417
 418                         newmsg = (struct ExpressMessage *)
 419                                 malloc(sizeof (struct ExpressMessage));
 420                         memset(newmsg, 0,
 421                                 sizeof (struct ExpressMessage));
 422                         time(&(newmsg->timestamp));
 423                         safestrncpy(newmsg->sender, CC->user.fullname,
 424                                     sizeof newmsg->sender);
 425                         newmsg->flags |= EM_GO_AWAY;
 426                         newmsg->text = strdup("Automatic logoff requested.");
 427
 428                         add_xmsg_to_context(ccptr, newmsg);
 429                         ++sessions;
 430
 431                 }
 432         }
 433         end_critical_section(S_SESSION_TABLE);
 434         cprintf("%d Sent termination request to %d sessions.\n", CIT_OK, sessions);
 435 }
 436
 437
 438 /*
 439  * This is the back end for flush_conversations_to_disk()
 440  * At this point we've isolated a single conversation (struct imlog)
 441  * and are ready to write it to disk.
 442  */
 443 void flush_individual_conversation(struct imlog *im) {
 444         struct CtdlMessage *msg;
 445         long msgnum = 0;
 446         char roomname[ROOMNAMELEN];
 447         StrBuf *MsgBuf, *FullMsgBuf;
 448
 449         StrBufAppendBufPlain(im->conversation, HKEY(
 450                 "</body>\r\n"
 451                 "</html>\r\n"
 452                 ), 0
 453         );
 454
 455         MsgBuf = StrBufRFC2047encodeMessage(im->conversation);
 456         FlushStrBuf(im->conversation);
 457         FullMsgBuf = NewStrBufPlain(NULL, StrLength(im->conversation) + 100);
 458
 459         StrBufAppendBufPlain(FullMsgBuf, HKEY(
 460                         "Content-type: text/html; charset=UTF-8\r\n"
 461                         "Content-Transfer-Encoding: quoted-printable\r\n"
 462                         "\r\n"
 463                         ), 0);
 464         StrBufAppendBuf (FullMsgBuf, MsgBuf, 0);
 465         FreeStrBuf(&MsgBuf);
 466
 467         msg = malloc(sizeof(struct CtdlMessage));
 468         memset(msg, 0, sizeof(struct CtdlMessage));
 469         msg->cm_magic = CTDLMESSAGE_MAGIC;
 470         msg->cm_anon_type = MES_NORMAL;
 471         msg->cm_format_type = FMT_RFC822;
 472         if (!IsEmptyStr(im->usernames[0])) {
 473                 CM_SetField(msg, eAuthor, im->usernames[0], strlen(im->usernames[0]));
 474         } else {
 475                 CM_SetField(msg, eAuthor, HKEY("Citadel"));
 476         }
 477         if (!IsEmptyStr(im->usernames[1])) {
 478                 CM_SetField(msg, eRecipient, im->usernames[1], strlen(im->usernames[1]));
 479         }
 480
 481         CM_SetField(msg, eOriginalRoom, HKEY(PAGELOGROOM));
 482         CM_SetField(msg, eNodeName, CtdlGetConfigStr("c_nodename"), strlen(CtdlGetConfigStr("c_nodename")));
 483         CM_SetAsFieldSB(msg, eMesageText, &FullMsgBuf); /* we own this memory now */
 484
 485         /* Start with usernums[1] because it's guaranteed to be higher than usernums[0],
 486          * so if there's only one party, usernums[0] will be zero but usernums[1] won't.
 487          * Create the room if necessary.  Note that we create as a type 5 room rather
 488          * than 4, which indicates that it's a personal room but we've already supplied
 489          * the namespace prefix.
 490          *
 491          * In the unlikely event that usernums[1] is zero, a room with an invalid namespace
 492          * prefix will be created.  That's ok because the auto-purger will clean it up later.
 493          */
 494         snprintf(roomname, sizeof roomname, "%010ld.%s", im->usernums[1], PAGELOGROOM);
 495         CtdlCreateRoom(roomname, 5, "", 0, 1, 1, VIEW_BBS);
 496         msgnum = CtdlSubmitMsg(msg, NULL, roomname, 0);
 497         CM_Free(msg);
 498
 499         /* If there is a valid user number in usernums[0], save a copy for them too. */
 500         if (im->usernums[0] > 0) {
 501                 snprintf(roomname, sizeof roomname, "%010ld.%s", im->usernums[0], PAGELOGROOM);
 502                 CtdlCreateRoom(roomname, 5, "", 0, 1, 1, VIEW_BBS);
 503                 CtdlSaveMsgPointerInRoom(roomname, msgnum, 0, NULL);
 504         }
 505
 506         /* Finally, if we're logging instant messages globally, do that now. */
 507         if (!IsEmptyStr(CtdlGetConfigStr("c_logpages"))) {
 508                 CtdlCreateRoom(CtdlGetConfigStr("c_logpages"), 3, "", 0, 1, 1, VIEW_BBS);
 509                 CtdlSaveMsgPointerInRoom(CtdlGetConfigStr("c_logpages"), msgnum, 0, NULL);
 510         }
 511
 512 }
 513
 514 /*
 515  * Locate instant message conversations which have gone idle
 516  * (or, if the server is shutting down, locate *all* conversations)
 517  * and flush them to disk (in the participants' log rooms, etc.)
 518  */
 519 void flush_conversations_to_disk(time_t if_older_than) {
 520
 521         struct imlog *flush_these = NULL;
 522         struct imlog *dont_flush_these = NULL;
 523         struct imlog *imptr = NULL;
 524         struct CitContext *nptr;
 525         int nContexts, i;
 526
 527         nptr = CtdlGetContextArray(&nContexts) ;        /* Make a copy of the current wholist */
 528
 529         begin_critical_section(S_IM_LOGS);
 530         while (imlist)
 531         {
 532                 imptr = imlist;
 533                 imlist = imlist->next;
 534
 535                 /* For a two party conversation, if one party has logged out, force flush. */
 536                 if (nptr) {
 537                         int user0_is_still_online = 0;
 538                         int user1_is_still_online = 0;
 539                         for (i=0; i<nContexts; i++)  {
 540                                 if (nptr[i].user.usernum == imptr->usernums[0]) ++user0_is_still_online;
 541                                 if (nptr[i].user.usernum == imptr->usernums[1]) ++user1_is_still_online;
 542                         }
 543                         if (imptr->usernums[0] != imptr->usernums[1]) {         /* two party conversation */
 544                                 if ((!user0_is_still_online) || (!user1_is_still_online)) {
 545                                         imptr->lastmsg = 0L;    /* force flush */
 546                                 }
 547                         }
 548                         else {          /* one party conversation (yes, people do IM themselves) */
 549                                 if (!user0_is_still_online) {
 550                                         imptr->lastmsg = 0L;    /* force flush */
 551                                 }
 552                         }
 553                 }
 554
 555                 /* Now test this conversation to see if it qualifies for flushing. */
 556                 if ((time(NULL) - imptr->lastmsg) > if_older_than)
 557                 {
 558                         /* This conversation qualifies.  Move it to the list of ones to flush. */
 559                         imptr->next = flush_these;
 560                         flush_these = imptr;
 561                 }
 562                 else  {
 563                         /* Move it to the list of ones not to flush. */
 564                         imptr->next = dont_flush_these;
 565                         dont_flush_these = imptr;
 566                 }
 567         }
 568         imlist = dont_flush_these;
 569         end_critical_section(S_IM_LOGS);
 570         free(nptr);
 571
 572         /* We are now outside of the critical section, and we are the only thread holding a
 573          * pointer to a linked list of conversations to be flushed to disk.
 574          */
 575         while (flush_these) {
 576
 577                 flush_individual_conversation(flush_these);     /* This will free the string buffer */
 578                 imptr = flush_these;
 579                 flush_these = flush_these->next;
 580                 free(imptr);
 581         }
 582 }
 583
 584
 585
 586 void instmsg_timer(void) {
 587         flush_conversations_to_disk(300);       /* Anything that hasn't peeped in more than 5 minutes */
 588 }
 589
 590 void instmsg_shutdown(void) {
 591         flush_conversations_to_disk(0);         /* Get it ALL onto disk NOW. */
 592 }
 593
 594 CTDL_MODULE_INIT(instmsg)
 595 {
 596         if (!threading)
 597         {
 598                 CtdlRegisterProtoHook(cmd_gexp, "GEXP", "Get instant messages");
 599                 CtdlRegisterProtoHook(cmd_sexp, "SEXP", "Send an instant message");
 600                 CtdlRegisterProtoHook(cmd_dexp, "DEXP", "Disable instant messages");
 601                 CtdlRegisterProtoHook(cmd_reqt, "REQT", "Request client termination");
 602                 CtdlRegisterSessionHook(cmd_gexp_async, EVT_ASYNC, PRIO_ASYNC + 1);
 603                 CtdlRegisterSessionHook(delete_instant_messages, EVT_STOP, PRIO_STOP + 1);
 604                 CtdlRegisterXmsgHook(send_instant_message, XMSG_PRI_LOCAL);
 605                 CtdlRegisterSessionHook(instmsg_timer, EVT_TIMER, PRIO_CLEANUP + 400);
 606                 CtdlRegisterSessionHook(instmsg_shutdown, EVT_SHUTDOWN, PRIO_SHUTDOWN + 10);
 607         }
 608
 609         /* return our module name for the log */
 610         return "instmsg";
 611 }