citadel/modules/network/serv_network.c

   1 /*
   2  * This module handles shared rooms, inter-Citadel mail, and outbound
   3  * mailing list processing.
   4  *
   5  * Copyright (c) 2000-2012 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  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  16  * This is a fairly high-level type of critical section.  It ensures that no
  17  * two threads work on the netconfigs files at the same time.  Since we do
  18  * so many things inside these, here are the rules:
  19  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  20  *  2. Do *not* perform any I/O with the client during these sections.
  21  *
  22  */
  23
  24 /*
  25  * Duration of time (in seconds) after which pending list subscribe/unsubscribe
  26  * requests that have not been confirmed will be deleted.
  27  */
  28 #define EXP     259200  /* three days */
  29
  30 #include "sysdep.h"
  31 #include <stdlib.h>
  32 #include <unistd.h>
  33 #include <stdio.h>
  34 #include <fcntl.h>
  35 #include <ctype.h>
  36 #include <signal.h>
  37 #include <pwd.h>
  38 #include <errno.h>
  39 #include <sys/stat.h>
  40 #include <sys/types.h>
  41 #include <dirent.h>
  42 #if TIME_WITH_SYS_TIME
  43 # include <sys/time.h>
  44 # include <time.h>
  45 #else
  46 # if HAVE_SYS_TIME_H
  47 #  include <sys/time.h>
  48 # else
  49 #  include <time.h>
  50 # endif
  51 #endif
  52 #ifdef HAVE_SYSCALL_H
  53 # include <syscall.h>
  54 #else
  55 # if HAVE_SYS_SYSCALL_H
  56 #  include <sys/syscall.h>
  57 # endif
  58 #endif
  59
  60 #include <sys/wait.h>
  61 #include <string.h>
  62 #include <limits.h>
  63 #include <libcitadel.h>
  64 #include "citadel.h"
  65 #include "server.h"
  66 #include "citserver.h"
  67 #include "support.h"
  68 #include "config.h"
  69 #include "user_ops.h"
  70 #include "database.h"
  71 #include "msgbase.h"
  72 #include "internet_addressing.h"
  73 #include "serv_network.h"
  74 #include "clientsocket.h"
  75 #include "file_ops.h"
  76 #include "citadel_dirs.h"
  77 #include "threads.h"
  78 #include "context.h"
  79 #include "netconfig.h"
  80 #include "netspool.h"
  81 #include "netmail.h"
  82 #include "ctdl_module.h"
  83
  84 int NetQDebugEnabled = 0;
  85 struct CitContext networker_spool_CC;
  86
  87 /* comes from lookup3.c from libcitadel... */
  88 extern uint32_t hashlittle( const void *key, size_t length, uint32_t initval);
  89
  90 typedef struct __roomlists {
  91         RoomProcList *rplist;
  92         HashList *RoomsInterestedIn;
  93 }roomlists;
  94 /*
  95  * When we do network processing, it's accomplished in two passes; one to
  96  * gather a list of rooms and one to actually do them.  It's ok that rplist
  97  * is global; we have a mutex that keeps it safe.
  98  */
  99 struct RoomProcList *rplist = NULL;
 100
 101 int GetNetworkedRoomNumbers(const char *DirName, HashList *DirList)
 102 {
 103         DIR *filedir = NULL;
 104         struct dirent *d;
 105         struct dirent *filedir_entry;
 106         long RoomNR;
 107         long Count = 0;
 108
 109         filedir = opendir (DirName);
 110         if (filedir == NULL) {
 111                 return 0;
 112         }
 113
 114         d = (struct dirent *)malloc(offsetof(struct dirent, d_name) + PATH_MAX + 1);
 115         if (d == NULL) {
 116                 return 0;
 117         }
 118
 119         while ((readdir_r(filedir, d, &filedir_entry) == 0) &&
 120                (filedir_entry != NULL))
 121         {
 122                 RoomNR = atol(filedir_entry->d_name);
 123                 if (RoomNR != 0) {
 124                         Count++;
 125                         Put(DirList, LKEY(RoomNR), &Count, reference_free_handler);
 126                 }
 127         }
 128         free(d);
 129         closedir(filedir);
 130         return Count;
 131 }
 132
 133
 134
 135
 136 /*
 137  * Check the use table.  This is a list of messages which have recently
 138  * arrived on the system.  It is maintained and queried to prevent the same
 139  * message from being entered into the database multiple times if it happens
 140  * to arrive multiple times by accident.
 141  */
 142 int network_usetable(struct CtdlMessage *msg)
 143 {
 144         struct CitContext *CCC = CC;
 145         char msgid[SIZ];
 146         struct cdbdata *cdbut;
 147         struct UseTable ut;
 148
 149         /* Bail out if we can't generate a message ID */
 150         if (msg == NULL) {
 151                 return(0);
 152         }
 153         if (msg->cm_fields['I'] == NULL) {
 154                 return(0);
 155         }
 156         if (IsEmptyStr(msg->cm_fields['I'])) {
 157                 return(0);
 158         }
 159
 160         /* Generate the message ID */
 161         strcpy(msgid, msg->cm_fields['I']);
 162         if (haschar(msgid, '@') == 0) {
 163                 strcat(msgid, "@");
 164                 if (msg->cm_fields['N'] != NULL) {
 165                         strcat(msgid, msg->cm_fields['N']);
 166                 }
 167                 else {
 168                         return(0);
 169                 }
 170         }
 171
 172         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 173         if (cdbut != NULL) {
 174                 cdb_free(cdbut);
 175                 QN_syslog(LOG_DEBUG, "network_usetable() : we already have %s\n", msgid);
 176                 return(1);
 177         }
 178
 179         /* If we got to this point, it's unique: add it. */
 180         strcpy(ut.ut_msgid, msgid);
 181         ut.ut_timestamp = time(NULL);
 182         cdb_store(CDB_USETABLE, msgid, strlen(msgid), &ut, sizeof(struct UseTable) );
 183         return(0);
 184 }
 185
 186
 187
 188
 189
 190
 191
 192 #if 0
 193
 194
 195 /*
 196  * Send the *entire* contents of the current room to one specific network node,
 197  * ignoring anything we know about which messages have already undergone
 198  * network processing.  This can be used to bring a new node into sync.
 199  */
 200 int network_sync_to(char *target_node, long len)
 201 {
 202         struct CitContext *CCC = CC;
 203         SpoolControl sc;
 204         int num_spooled = 0;
 205         int found_node = 0;
 206         char buf[256];
 207         char sc_type[256];
 208         char sc_node[256];
 209         char sc_room[256];
 210         char filename[PATH_MAX];
 211         FILE *fp;
 212
 213         /* Grab the configuration line we're looking for */
 214         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 215         begin_critical_section(S_NETCONFIGS);
 216         fp = fopen(filename, "r");
 217         if (fp == NULL) {
 218                 end_critical_section(S_NETCONFIGS);
 219                 return(-1);
 220         }
 221         while (fgets(buf, sizeof buf, fp) != NULL)
 222         {
 223                 buf[strlen(buf)-1] = 0;
 224
 225                 extract_token(sc_type, buf, 0, '|', sizeof sc_type);
 226                 if (strcasecmp(sc_type, "ignet_push_share"))
 227                         continue;
 228
 229                 extract_token(sc_node, buf, 1, '|', sizeof sc_node);
 230                 if (strcasecmp(sc_node, target_node))
 231                         continue;
 232
 233                 extract_token(sc_room, buf, 2, '|', sizeof sc_room);
 234                 found_node = 1;
 235
 236                 /* Concise syntax because we don't need a full linked-list */
 237                 memset(&sc, 0, sizeof(SpoolControl));
 238                 sc.ignet_push_shares = (maplist *)
 239                         malloc(sizeof(maplist));
 240                 sc.ignet_push_shares->next = NULL;
 241                 safestrncpy(sc.ignet_push_shares->remote_nodename,
 242                             sc_node,
 243                             sizeof sc.ignet_push_shares->remote_nodename);
 244                 safestrncpy(sc.ignet_push_shares->remote_roomname,
 245                             sc_room,
 246                             sizeof sc.ignet_push_shares->remote_roomname);
 247         }
 248         fclose(fp);
 249         end_critical_section(S_NETCONFIGS);
 250
 251         if (!found_node) {
 252                 free(sc.ignet_push_shares);
 253                 return(-1);
 254         }
 255
 256         sc.working_ignetcfg = load_ignetcfg();
 257         sc.the_netmap = read_network_map();
 258
 259         /* Send ALL messages */
 260         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL,
 261                 network_spool_msg, &sc);
 262
 263         /* Concise cleanup because we know there's only one node in the sc */
 264         free(sc.ignet_push_shares);
 265
 266         DeleteHash(&sc.working_ignetcfg);
 267         DeleteHash(&sc.the_netmap);
 268
 269         QN_syslog(LOG_NOTICE, "Synchronized %d messages to <%s>\n",
 270                   num_spooled, target_node);
 271         return(num_spooled);
 272 }
 273
 274 #endif
 275
 276
 277 /*
 278  * Implements the NSYN command
 279  */
 280 void cmd_nsyn(char *argbuf) {
 281         int num_spooled;
 282         long len;
 283         char target_node[256];
 284
 285         if (CtdlAccessCheck(ac_aide)) return;
 286
 287         len = extract_token(target_node, argbuf, 0, '|', sizeof target_node);
 288         ///// TODO num_spooled = network_sync_to(target_node, len);
 289         if (num_spooled >= 0) {
 290                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
 291         }
 292         else {
 293                 cprintf("%d No such room/node share exists.\n",
 294                         ERROR + ROOM_NOT_FOUND);
 295         }
 296 }
 297
 298
 299
 300 /*
 301  * Batch up and send all outbound traffic from the current room
 302  */
 303 void network_queue_interesting_rooms(struct ctdlroom *qrbuf, void *data) {
 304         int i;
 305         struct RoomProcList *ptr;
 306         long QRNum = qrbuf->QRnumber;
 307         void *v;
 308         roomlists *RP = (roomlists*) data;
 309
 310         if (!GetHash(RP->RoomsInterestedIn, LKEY(QRNum), &v))
 311                 return;
 312
 313         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
 314         if (ptr == NULL) return;
 315
 316         ptr->namelen = strlen(qrbuf->QRname);
 317         if (ptr->namelen > ROOMNAMELEN)
 318                 ptr->namelen = ROOMNAMELEN - 1;
 319
 320         memcpy (ptr->name, qrbuf->QRname, ptr->namelen);
 321         ptr->name[ptr->namelen] = '\0';
 322         ptr->QRNum = qrbuf->QRnumber;
 323
 324         for (i = 0; i < ptr->namelen; i++)
 325         {
 326                 ptr->lcname[i] = tolower(ptr->name[i]);
 327         }
 328
 329         ptr->lcname[ptr->namelen] = '\0';
 330         ptr->key = hashlittle(ptr->lcname, ptr->namelen, 9872345);
 331         ptr->next = RP->rplist;
 332         RP->rplist = ptr;
 333 }
 334
 335 /*
 336  * Batch up and send all outbound traffic from the current room
 337  */
 338 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
 339         int i;
 340         struct RoomProcList *ptr;
 341
 342         if (qrbuf->QRdefaultview == VIEW_QUEUE)
 343                 return;
 344         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
 345         if (ptr == NULL) return;
 346
 347         ptr->namelen = strlen(qrbuf->QRname);
 348         if (ptr->namelen > ROOMNAMELEN)
 349                 ptr->namelen = ROOMNAMELEN - 1;
 350
 351         memcpy (ptr->name, qrbuf->QRname, ptr->namelen);
 352         ptr->name[ptr->namelen] = '\0';
 353         ptr->QRNum = qrbuf->QRnumber;
 354
 355         for (i = 0; i < ptr->namelen; i++)
 356         {
 357                 ptr->lcname[i] = tolower(ptr->name[i]);
 358         }
 359         ptr->lcname[ptr->namelen] = '\0';
 360         ptr->key = hashlittle(ptr->lcname, ptr->namelen, 9872345);
 361
 362         begin_critical_section(S_RPLIST);
 363         ptr->next = rplist;
 364         rplist = ptr;
 365         end_critical_section(S_RPLIST);
 366 }
 367
 368 void destroy_network_queue_room(RoomProcList *rplist)
 369 {
 370         struct RoomProcList *cur, *p;
 371
 372         cur = rplist;
 373         while (cur != NULL)
 374         {
 375                 p = cur->next;
 376                 free (cur);
 377                 cur = p;
 378         }
 379 }
 380
 381 void destroy_network_queue_room_locked (void)
 382 {
 383         begin_critical_section(S_RPLIST);
 384         destroy_network_queue_room(rplist);
 385         end_critical_section(S_RPLIST);
 386 }
 387
 388
 389
 390 /*
 391  * Bounce a message back to the sender
 392  */
 393 void network_bounce(struct CtdlMessage *msg, char *reason)
 394 {
 395         struct CitContext *CCC = CC;
 396         char *oldpath = NULL;
 397         char buf[SIZ];
 398         char bouncesource[SIZ];
 399         char recipient[SIZ];
 400         struct recptypes *valid = NULL;
 401         char force_room[ROOMNAMELEN];
 402         static int serialnum = 0;
 403         size_t size;
 404
 405         QNM_syslog(LOG_DEBUG, "entering network_bounce()\n");
 406
 407         if (msg == NULL) return;
 408
 409         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
 410
 411         /*
 412          * Give it a fresh message ID
 413          */
 414         if (msg->cm_fields['I'] != NULL) {
 415                 free(msg->cm_fields['I']);
 416         }
 417         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
 418                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
 419         msg->cm_fields['I'] = strdup(buf);
 420
 421         /*
 422          * FIXME ... right now we're just sending a bounce; we really want to
 423          * include the text of the bounced message.
 424          */
 425         if (msg->cm_fields['M'] != NULL) {
 426                 free(msg->cm_fields['M']);
 427         }
 428         msg->cm_fields['M'] = strdup(reason);
 429         msg->cm_format_type = 0;
 430
 431         /*
 432          * Turn the message around
 433          */
 434         if (msg->cm_fields['R'] == NULL) {
 435                 free(msg->cm_fields['R']);
 436         }
 437
 438         if (msg->cm_fields['D'] == NULL) {
 439                 free(msg->cm_fields['D']);
 440         }
 441
 442         snprintf(recipient, sizeof recipient, "%s@%s",
 443                 msg->cm_fields['A'], msg->cm_fields['N']);
 444
 445         if (msg->cm_fields['A'] == NULL) {
 446                 free(msg->cm_fields['A']);
 447         }
 448
 449         if (msg->cm_fields['N'] == NULL) {
 450                 free(msg->cm_fields['N']);
 451         }
 452
 453         if (msg->cm_fields['U'] == NULL) {
 454                 free(msg->cm_fields['U']);
 455         }
 456
 457         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
 458         msg->cm_fields['N'] = strdup(config.c_nodename);
 459         msg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
 460
 461         /* prepend our node to the path */
 462         if (msg->cm_fields['P'] != NULL) {
 463                 oldpath = msg->cm_fields['P'];
 464                 msg->cm_fields['P'] = NULL;
 465         }
 466         else {
 467                 oldpath = strdup("unknown_user");
 468         }
 469         size = strlen(oldpath) + SIZ;
 470         msg->cm_fields['P'] = malloc(size);
 471         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
 472         free(oldpath);
 473
 474         /* Now submit the message */
 475         valid = validate_recipients(recipient, NULL, 0);
 476         if (valid != NULL) if (valid->num_error != 0) {
 477                 free_recipients(valid);
 478                 valid = NULL;
 479         }
 480         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
 481                 strcpy(force_room, config.c_aideroom);
 482         }
 483         else {
 484                 strcpy(force_room, "");
 485         }
 486         if ( (valid == NULL) && IsEmptyStr(force_room) ) {
 487                 strcpy(force_room, config.c_aideroom);
 488         }
 489         CtdlSubmitMsg(msg, valid, force_room, 0);
 490
 491         /* Clean up */
 492         if (valid != NULL) free_recipients(valid);
 493         CtdlFreeMessage(msg);
 494         QNM_syslog(LOG_DEBUG, "leaving network_bounce()\n");
 495 }
 496
 497
 498
 499
 500
 501
 502
 503 /*
 504  * network_do_queue()
 505  *
 506  * Run through the rooms doing various types of network stuff.
 507  */
 508 void network_do_queue(void)
 509 {
 510         struct CitContext *CCC = CC;
 511         static int doing_queue = 0;
 512         static time_t last_run = 0L;
 513         int full_processing = 1;
 514         HashList *working_ignetcfg;
 515         HashList *the_netmap = NULL;
 516         int netmap_changed = 0;
 517         roomlists RL;
 518
 519         /*
 520          * Run the full set of processing tasks no more frequently
 521          * than once every n seconds
 522          */
 523         if ( (time(NULL) - last_run) < config.c_net_freq ) {
 524                 full_processing = 0;
 525                 syslog(LOG_DEBUG, "Network full processing in %ld seconds.\n",
 526                        config.c_net_freq - (time(NULL)- last_run)
 527                 );
 528         }
 529
 530         /*
 531          * This is a simple concurrency check to make sure only one queue run
 532          * is done at a time.  We could do this with a mutex, but since we
 533          * don't really require extremely fine granularity here, we'll do it
 534          * with a static variable instead.
 535          */
 536         if (doing_queue) {
 537                 return;
 538         }
 539         doing_queue = 1;
 540
 541         become_session(&networker_spool_CC);
 542         begin_critical_section(S_RPLIST);
 543         RL.rplist = rplist;
 544         rplist = NULL;
 545         end_critical_section(S_RPLIST);
 546
 547         RL.RoomsInterestedIn = NewHash(1, lFlathash);
 548         if (full_processing &&
 549             (GetNetworkedRoomNumbers(ctdl_netcfg_dir, RL.RoomsInterestedIn)==0))
 550         {
 551                 doing_queue = 0;
 552                 DeleteHash(&RL.RoomsInterestedIn);
 553                 if (RL.rplist == NULL)
 554                         return;
 555         }
 556         /* Load the IGnet Configuration into memory */
 557         working_ignetcfg = load_ignetcfg();
 558
 559         /*
 560          * Load the network map and filter list into memory.
 561          */
 562         if (!server_shutting_down)
 563                 the_netmap = read_network_map();
 564         if (!server_shutting_down)
 565                 load_network_filter_list();
 566
 567         /*
 568          * Go ahead and run the queue
 569          */
 570         if (full_processing && !server_shutting_down) {
 571                 QNM_syslog(LOG_DEBUG, "network: loading outbound queue");
 572                 CtdlForEachRoom(network_queue_interesting_rooms, &RL);
 573         }
 574
 575         if ((RL.rplist != NULL) && (!server_shutting_down)) {
 576                 RoomProcList *ptr, *cmp;
 577                 ptr = RL.rplist;
 578                 QNM_syslog(LOG_DEBUG, "network: running outbound queue");
 579                 while (ptr != NULL && !server_shutting_down) {
 580
 581                         cmp = ptr->next;
 582
 583                         while (cmp != NULL) {
 584                                 if ((cmp->namelen > 0) &&
 585                                     (cmp->key == ptr->key) &&
 586                                     (cmp->namelen == ptr->namelen) &&
 587                                     (strcmp(cmp->lcname, ptr->lcname) == 0))
 588                                 {
 589                                         cmp->namelen = 0;
 590                                 }
 591                                 cmp = cmp->next;
 592                         }
 593
 594                         if (ptr->namelen > 0) {
 595                                 network_spoolout_room(ptr,
 596                                                       working_ignetcfg,
 597                                                       the_netmap);
 598                         }
 599                         ptr = ptr->next;
 600                 }
 601         }
 602
 603         /* If there is anything in the inbound queue, process it */
 604         if (!server_shutting_down) {
 605                 network_do_spoolin(working_ignetcfg,
 606                                    the_netmap,
 607                                    &netmap_changed);
 608         }
 609
 610         /* Free the filter list in memory */
 611         free_netfilter_list();
 612
 613         /* Save the network map back to disk */
 614         if (netmap_changed) {
 615                 StrBuf *MapStr = SerializeNetworkMap(the_netmap);
 616                 CtdlPutSysConfig(IGNETMAP, SmashStrBuf(&MapStr));
 617         }
 618
 619         /* combine singe message files into one spool entry per remote node. */
 620         network_consolidate_spoolout(working_ignetcfg, the_netmap);
 621
 622         /* shut down. */
 623
 624         DeleteHash(&the_netmap);
 625
 626         DeleteHash(&working_ignetcfg);
 627
 628         QNM_syslog(LOG_DEBUG, "network: queue run completed");
 629
 630         if (full_processing) {
 631                 last_run = time(NULL);
 632         }
 633         DeleteHash(&RL.RoomsInterestedIn);
 634         destroy_network_queue_room(RL.rplist);
 635         doing_queue = 0;
 636 }
 637
 638
 639
 640
 641 int network_room_handler (struct ctdlroom *room)
 642 {
 643         network_queue_room(room, NULL);
 644         return 0;
 645 }
 646
 647 int NTTDebugEnabled = 0;
 648
 649 /*
 650  * network_talking_to()  --  concurrency checker
 651  */
 652 static HashList *nttlist = NULL;
 653 int network_talking_to(const char *nodename, long len, int operation) {
 654
 655         int retval = 0;
 656         HashPos *Pos = NULL;
 657         void *vdata;
 658
 659         begin_critical_section(S_NTTLIST);
 660
 661         switch(operation) {
 662
 663                 case NTT_ADD:
 664                         if (nttlist == NULL)
 665                                 nttlist = NewHash(1, NULL);
 666                         Put(nttlist, nodename, len, NewStrBufPlain(nodename, len), HFreeStrBuf);
 667                         if (NTTDebugEnabled) syslog(LOG_DEBUG, "nttlist: added <%s>\n", nodename);
 668                         break;
 669                 case NTT_REMOVE:
 670                         if ((nttlist == NULL) ||
 671                             (GetCount(nttlist) == 0))
 672                                 break;
 673                         Pos = GetNewHashPos(nttlist, 1);
 674                         if (GetHashPosFromKey (nttlist, nodename, len, Pos))
 675                                 DeleteEntryFromHash(nttlist, Pos);
 676                         DeleteHashPos(&Pos);
 677                         if (NTTDebugEnabled) syslog(LOG_DEBUG, "nttlist: removed <%s>\n", nodename);
 678
 679                         break;
 680
 681                 case NTT_CHECK:
 682                         if ((nttlist == NULL) ||
 683                             (GetCount(nttlist) == 0))
 684                                 break;
 685                         if (GetHash(nttlist, nodename, len, &vdata))
 686                                 retval ++;
 687                         if (NTTDebugEnabled) syslog(LOG_DEBUG, "nttlist: have [%d] <%s>\n", retval, nodename);
 688                         break;
 689         }
 690
 691         end_critical_section(S_NTTLIST);
 692         return(retval);
 693 }
 694
 695 void cleanup_nttlist(void)
 696 {
 697         begin_critical_section(S_NTTLIST);
 698         DeleteHash(&nttlist);
 699         end_critical_section(S_NTTLIST);
 700 }
 701
 702
 703
 704 void network_logout_hook(void)
 705 {
 706         CitContext *CCC = MyContext();
 707
 708         /*
 709          * If we were talking to a network node, we're not anymore...
 710          */
 711         if (!IsEmptyStr(CCC->net_node)) {
 712                 network_talking_to(CCC->net_node, strlen(CCC->net_node), NTT_REMOVE);
 713                 CCC->net_node[0] = '\0';
 714         }
 715 }
 716 void network_cleanup_function(void)
 717 {
 718         struct CitContext *CCC = CC;
 719
 720         if (!IsEmptyStr(CCC->net_node)) {
 721                 network_talking_to(CCC->net_node, strlen(CCC->net_node), NTT_REMOVE);
 722                 CCC->net_node[0] = '\0';
 723         }
 724 }
 725
 726
 727 /*
 728  * Module entry point
 729  */
 730 void SetNTTDebugEnabled(const int n)
 731 {
 732         NTTDebugEnabled = n;
 733 }
 734 void SetNetQDebugEnabled(const int n)
 735 {
 736         NetQDebugEnabled = n;
 737 }
 738
 739 CTDL_MODULE_INIT(network)
 740 {
 741         if (!threading)
 742         {
 743                 CtdlFillSystemContext(&networker_spool_CC, "CitNetSpool");
 744                 CtdlRegisterDebugFlagHook(HKEY("networktalkingto"), SetNTTDebugEnabled, &NTTDebugEnabled);
 745                 CtdlRegisterDebugFlagHook(HKEY("networkqueue"), SetNetQDebugEnabled, &NetQDebugEnabled);
 746                 CtdlRegisterCleanupHook(cleanup_nttlist);
 747                 CtdlRegisterSessionHook(network_cleanup_function, EVT_STOP, PRIO_STOP + 30);
 748                 CtdlRegisterSessionHook(network_logout_hook, EVT_LOGOUT, PRIO_LOGOUT + 10);
 749                 CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
 750                 CtdlRegisterRoomHook(network_room_handler);
 751                 CtdlRegisterCleanupHook(destroy_network_queue_room_locked);
 752                 CtdlRegisterSessionHook(network_do_queue, EVT_TIMER, PRIO_QUEUE + 10);
 753         }
 754         return "network";
 755 }