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 as published by
   9  *  the Free Software Foundation; either version 3 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  22  * This is a fairly high-level type of critical section.  It ensures that no
  23  * two threads work on the netconfigs files at the same time.  Since we do
  24  * so many things inside these, here are the rules:
  25  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  26  *  2. Do *not* perform any I/O with the client during these sections.
  27  *
  28  */
  29
  30 /*
  31  * Duration of time (in seconds) after which pending list subscribe/unsubscribe
  32  * requests that have not been confirmed will be deleted.
  33  */
  34 #define EXP     259200  /* three days */
  35
  36 #include "sysdep.h"
  37 #include <stdlib.h>
  38 #include <unistd.h>
  39 #include <stdio.h>
  40 #include <fcntl.h>
  41 #include <ctype.h>
  42 #include <signal.h>
  43 #include <pwd.h>
  44 #include <errno.h>
  45 #include <sys/stat.h>
  46 #include <sys/types.h>
  47 #include <dirent.h>
  48 #if TIME_WITH_SYS_TIME
  49 # include <sys/time.h>
  50 # include <time.h>
  51 #else
  52 # if HAVE_SYS_TIME_H
  53 #  include <sys/time.h>
  54 # else
  55 #  include <time.h>
  56 # endif
  57 #endif
  58 #ifdef HAVE_SYSCALL_H
  59 # include <syscall.h>
  60 #else
  61 # if HAVE_SYS_SYSCALL_H
  62 #  include <sys/syscall.h>
  63 # endif
  64 #endif
  65
  66 #include <sys/wait.h>
  67 #include <string.h>
  68 #include <limits.h>
  69 #include <libcitadel.h>
  70 #include "citadel.h"
  71 #include "server.h"
  72 #include "citserver.h"
  73 #include "support.h"
  74 #include "config.h"
  75 #include "user_ops.h"
  76 #include "database.h"
  77 #include "msgbase.h"
  78 #include "internet_addressing.h"
  79 #include "serv_network.h"
  80 #include "clientsocket.h"
  81 #include "file_ops.h"
  82 #include "citadel_dirs.h"
  83 #include "threads.h"
  84
  85 #ifndef HAVE_SNPRINTF
  86 #include "snprintf.h"
  87 #endif
  88
  89 #include "context.h"
  90 #include "netconfig.h"
  91 #include "netspool.h"
  92 #include "netmail.h"
  93 #include "ctdl_module.h"
  94
  95 /* comes from lookup3.c from libcitadel... */
  96 extern uint32_t hashlittle( const void *key, size_t length, uint32_t initval);
  97
  98 typedef struct __roomlists {
  99         RoomProcList *rplist;
 100         HashList *RoomsInterestedIn;
 101 }roomlists;
 102 /*
 103  * When we do network processing, it's accomplished in two passes; one to
 104  * gather a list of rooms and one to actually do them.  It's ok that rplist
 105  * is global; we have a mutex that keeps it safe.
 106  */
 107 struct RoomProcList *rplist = NULL;
 108
 109 int GetNetworkedRoomNumbers(const char *DirName, HashList *DirList)
 110 {
 111         DIR *filedir = NULL;
 112         struct dirent *d;
 113         struct dirent *filedir_entry;
 114         long RoomNR;
 115         long Count = 0;
 116
 117         filedir = opendir (DirName);
 118         if (filedir == NULL) {
 119                 return 0;
 120         }
 121
 122         d = (struct dirent *)malloc(offsetof(struct dirent, d_name) + PATH_MAX + 1);
 123         if (d == NULL) {
 124                 return 0;
 125         }
 126
 127         while ((readdir_r(filedir, d, &filedir_entry) == 0) &&
 128                (filedir_entry != NULL))
 129         {
 130                 RoomNR = atol(filedir_entry->d_name);
 131                 if (RoomNR != 0) {
 132                         Count++;
 133                         Put(DirList, LKEY(RoomNR), &Count, reference_free_handler);
 134                 }
 135         }
 136         free(d);
 137         closedir(filedir);
 138         return Count;
 139 }
 140
 141
 142
 143
 144 /*
 145  * Check the use table.  This is a list of messages which have recently
 146  * arrived on the system.  It is maintained and queried to prevent the same
 147  * message from being entered into the database multiple times if it happens
 148  * to arrive multiple times by accident.
 149  */
 150 int network_usetable(struct CtdlMessage *msg) {
 151
 152         char msgid[SIZ];
 153         struct cdbdata *cdbut;
 154         struct UseTable ut;
 155
 156         /* Bail out if we can't generate a message ID */
 157         if (msg == NULL) {
 158                 return(0);
 159         }
 160         if (msg->cm_fields['I'] == NULL) {
 161                 return(0);
 162         }
 163         if (IsEmptyStr(msg->cm_fields['I'])) {
 164                 return(0);
 165         }
 166
 167         /* Generate the message ID */
 168         strcpy(msgid, msg->cm_fields['I']);
 169         if (haschar(msgid, '@') == 0) {
 170                 strcat(msgid, "@");
 171                 if (msg->cm_fields['N'] != NULL) {
 172                         strcat(msgid, msg->cm_fields['N']);
 173                 }
 174                 else {
 175                         return(0);
 176                 }
 177         }
 178
 179         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 180         if (cdbut != NULL) {
 181                 cdb_free(cdbut);
 182                 syslog(LOG_DEBUG, "network_usetable() : we already have %s\n", msgid);
 183                 return(1);
 184         }
 185
 186         /* If we got to this point, it's unique: add it. */
 187         strcpy(ut.ut_msgid, msgid);
 188         ut.ut_timestamp = time(NULL);
 189         cdb_store(CDB_USETABLE, msgid, strlen(msgid), &ut, sizeof(struct UseTable) );
 190         return(0);
 191 }
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202 /*
 203  * Send the *entire* contents of the current room to one specific network node,
 204  * ignoring anything we know about which messages have already undergone
 205  * network processing.  This can be used to bring a new node into sync.
 206  */
 207 int network_sync_to(char *target_node, long len)
 208 {
 209         SpoolControl sc;
 210         int num_spooled = 0;
 211         int found_node = 0;
 212         char buf[256];
 213         char sc_type[256];
 214         char sc_node[256];
 215         char sc_room[256];
 216         char filename[PATH_MAX];
 217         FILE *fp;
 218
 219         /* Grab the configuration line we're looking for */
 220         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 221         begin_critical_section(S_NETCONFIGS);
 222         fp = fopen(filename, "r");
 223         if (fp == NULL) {
 224                 end_critical_section(S_NETCONFIGS);
 225                 return(-1);
 226         }
 227         while (fgets(buf, sizeof buf, fp) != NULL)
 228         {
 229                 buf[strlen(buf)-1] = 0;
 230
 231                 extract_token(sc_type, buf, 0, '|', sizeof sc_type);
 232                 if (strcasecmp(sc_type, "ignet_push_share"))
 233                         continue;
 234
 235                 extract_token(sc_node, buf, 1, '|', sizeof sc_node);
 236                 if (!strcasecmp(sc_node, target_node))
 237                         continue;
 238
 239                 extract_token(sc_room, buf, 2, '|', sizeof sc_room);
 240                 found_node = 1;
 241
 242                 /* Concise syntax because we don't need a full linked-list */
 243                 memset(&sc, 0, sizeof(SpoolControl));
 244                 sc.ignet_push_shares = (maplist *)
 245                         malloc(sizeof(maplist));
 246                 sc.ignet_push_shares->next = NULL;
 247                 safestrncpy(sc.ignet_push_shares->remote_nodename,
 248                             sc_node,
 249                             sizeof sc.ignet_push_shares->remote_nodename);
 250                 safestrncpy(sc.ignet_push_shares->remote_roomname,
 251                             sc_room,
 252                             sizeof sc.ignet_push_shares->remote_roomname);
 253         }
 254         fclose(fp);
 255         end_critical_section(S_NETCONFIGS);
 256
 257         if (!found_node) return(-1);
 258
 259         sc.working_ignetcfg = load_ignetcfg();
 260         sc.the_netmap = read_network_map();
 261
 262         /* Send ALL messages */
 263         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL,
 264                 network_spool_msg, &sc);
 265
 266         /* Concise cleanup because we know there's only one node in the sc */
 267         free(sc.ignet_push_shares);
 268
 269         DeleteHash(&sc.working_ignetcfg);
 270         DeleteHash(&sc.the_netmap);
 271
 272         syslog(LOG_NOTICE, "Synchronized %d messages to <%s>\n",
 273                 num_spooled, target_node);
 274         return(num_spooled);
 275 }
 276
 277
 278 /*
 279  * Implements the NSYN command
 280  */
 281 void cmd_nsyn(char *argbuf) {
 282         int num_spooled;
 283         long len;
 284         char target_node[256];
 285
 286         if (CtdlAccessCheck(ac_aide)) return;
 287
 288         len = extract_token(target_node, argbuf, 0, '|', sizeof target_node);
 289         num_spooled = network_sync_to(target_node, len);
 290         if (num_spooled >= 0) {
 291                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
 292         }
 293         else {
 294                 cprintf("%d No such room/node share exists.\n",
 295                         ERROR + ROOM_NOT_FOUND);
 296         }
 297 }
 298
 299
 300
 301 /*
 302  * Batch up and send all outbound traffic from the current room
 303  */
 304 void network_queue_interesting_rooms(struct ctdlroom *qrbuf, void *data) {
 305         int i;
 306         struct RoomProcList *ptr;
 307         long QRNum = qrbuf->QRnumber;
 308         void *v;
 309         roomlists *RP = (roomlists*) data;
 310
 311         if (!GetHash(RP->RoomsInterestedIn, LKEY(QRNum), &v))
 312                 return;
 313
 314         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
 315         if (ptr == NULL) return;
 316
 317         ptr->namelen = strlen(qrbuf->QRname);
 318         if (ptr->namelen > ROOMNAMELEN)
 319                 ptr->namelen = ROOMNAMELEN - 1;
 320
 321         memcpy (ptr->name, qrbuf->QRname, ptr->namelen);
 322         ptr->name[ptr->namelen] = '\0';
 323         ptr->QRNum = qrbuf->QRnumber;
 324
 325         for (i = 0; i < ptr->namelen; i++)
 326         {
 327                 ptr->lcname[i] = tolower(ptr->name[i]);
 328         }
 329
 330         ptr->lcname[ptr->namelen] = '\0';
 331         ptr->key = hashlittle(ptr->lcname, ptr->namelen, 9872345);
 332         ptr->next = RP->rplist;
 333         RP->rplist = ptr;
 334 }
 335
 336 /*
 337  * Batch up and send all outbound traffic from the current room
 338  */
 339 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
 340         int i;
 341         struct RoomProcList *ptr;
 342
 343         if (qrbuf->QRdefaultview == VIEW_QUEUE)
 344                 return;
 345         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
 346         if (ptr == NULL) return;
 347
 348         ptr->namelen = strlen(qrbuf->QRname);
 349         if (ptr->namelen > ROOMNAMELEN)
 350                 ptr->namelen = ROOMNAMELEN - 1;
 351
 352         memcpy (ptr->name, qrbuf->QRname, ptr->namelen);
 353         ptr->name[ptr->namelen] = '\0';
 354         ptr->QRNum = qrbuf->QRnumber;
 355
 356         for (i = 0; i < ptr->namelen; i++)
 357         {
 358                 ptr->lcname[i] = tolower(ptr->name[i]);
 359         }
 360         ptr->lcname[ptr->namelen] = '\0';
 361         ptr->key = hashlittle(ptr->lcname, ptr->namelen, 9872345);
 362
 363         begin_critical_section(S_RPLIST);
 364         ptr->next = rplist;
 365         rplist = ptr;
 366         end_critical_section(S_RPLIST);
 367 }
 368
 369 void destroy_network_queue_room(RoomProcList *rplist)
 370 {
 371         struct RoomProcList *cur, *p;
 372
 373         cur = rplist;
 374         while (cur != NULL)
 375         {
 376                 p = cur->next;
 377                 free (cur);
 378                 cur = p;
 379         }
 380 }
 381
 382 void destroy_network_queue_room_locked (void)
 383 {
 384         begin_critical_section(S_RPLIST);
 385         destroy_network_queue_room(rplist);
 386         end_critical_section(S_RPLIST);
 387 }
 388
 389
 390
 391 /*
 392  * Bounce a message back to the sender
 393  */
 394 void network_bounce(struct CtdlMessage *msg, char *reason) {
 395         char *oldpath = NULL;
 396         char buf[SIZ];
 397         char bouncesource[SIZ];
 398         char recipient[SIZ];
 399         struct recptypes *valid = NULL;
 400         char force_room[ROOMNAMELEN];
 401         static int serialnum = 0;
 402         size_t size;
 403
 404         syslog(LOG_DEBUG, "entering network_bounce()\n");
 405
 406         if (msg == NULL) return;
 407
 408         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
 409
 410         /*
 411          * Give it a fresh message ID
 412          */
 413         if (msg->cm_fields['I'] != NULL) {
 414                 free(msg->cm_fields['I']);
 415         }
 416         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
 417                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
 418         msg->cm_fields['I'] = strdup(buf);
 419
 420         /*
 421          * FIXME ... right now we're just sending a bounce; we really want to
 422          * include the text of the bounced message.
 423          */
 424         if (msg->cm_fields['M'] != NULL) {
 425                 free(msg->cm_fields['M']);
 426         }
 427         msg->cm_fields['M'] = strdup(reason);
 428         msg->cm_format_type = 0;
 429
 430         /*
 431          * Turn the message around
 432          */
 433         if (msg->cm_fields['R'] == NULL) {
 434                 free(msg->cm_fields['R']);
 435         }
 436
 437         if (msg->cm_fields['D'] == NULL) {
 438                 free(msg->cm_fields['D']);
 439         }
 440
 441         snprintf(recipient, sizeof recipient, "%s@%s",
 442                 msg->cm_fields['A'], msg->cm_fields['N']);
 443
 444         if (msg->cm_fields['A'] == NULL) {
 445                 free(msg->cm_fields['A']);
 446         }
 447
 448         if (msg->cm_fields['N'] == NULL) {
 449                 free(msg->cm_fields['N']);
 450         }
 451
 452         if (msg->cm_fields['U'] == NULL) {
 453                 free(msg->cm_fields['U']);
 454         }
 455
 456         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
 457         msg->cm_fields['N'] = strdup(config.c_nodename);
 458         msg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
 459
 460         /* prepend our node to the path */
 461         if (msg->cm_fields['P'] != NULL) {
 462                 oldpath = msg->cm_fields['P'];
 463                 msg->cm_fields['P'] = NULL;
 464         }
 465         else {
 466                 oldpath = strdup("unknown_user");
 467         }
 468         size = strlen(oldpath) + SIZ;
 469         msg->cm_fields['P'] = malloc(size);
 470         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
 471         free(oldpath);
 472
 473         /* Now submit the message */
 474         valid = validate_recipients(recipient, NULL, 0);
 475         if (valid != NULL) if (valid->num_error != 0) {
 476                 free_recipients(valid);
 477                 valid = NULL;
 478         }
 479         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
 480                 strcpy(force_room, config.c_aideroom);
 481         }
 482         else {
 483                 strcpy(force_room, "");
 484         }
 485         if ( (valid == NULL) && IsEmptyStr(force_room) ) {
 486                 strcpy(force_room, config.c_aideroom);
 487         }
 488         CtdlSubmitMsg(msg, valid, force_room, 0);
 489
 490         /* Clean up */
 491         if (valid != NULL) free_recipients(valid);
 492         CtdlFreeMessage(msg);
 493         syslog(LOG_DEBUG, "leaving network_bounce()\n");
 494 }
 495
 496
 497
 498
 499
 500
 501
 502 /*
 503  * network_do_queue()
 504  *
 505  * Run through the rooms doing various types of network stuff.
 506  */
 507 void network_do_queue(void) {
 508         static int doing_queue = 0;
 509         static time_t last_run = 0L;
 510         int full_processing = 1;
 511         HashList *working_ignetcfg;
 512         HashList *the_netmap = NULL;
 513         int netmap_changed = 0;
 514         roomlists RL;
 515
 516         /*
 517          * Run the full set of processing tasks no more frequently
 518          * than once every n seconds
 519          */
 520         if ( (time(NULL) - last_run) < config.c_net_freq ) {
 521                 full_processing = 0;
 522                 syslog(LOG_DEBUG, "Network full processing in %ld seconds.\n",
 523                         config.c_net_freq - (time(NULL)- last_run)
 524                 );
 525         }
 526
 527         /*
 528          * This is a simple concurrency check to make sure only one queue run
 529          * is done at a time.  We could do this with a mutex, but since we
 530          * don't really require extremely fine granularity here, we'll do it
 531          * with a static variable instead.
 532          */
 533         if (doing_queue) {
 534                 return;
 535         }
 536         doing_queue = 1;
 537
 538         begin_critical_section(S_RPLIST);
 539         RL.rplist = rplist;
 540         rplist = NULL;
 541         end_critical_section(S_RPLIST);
 542
 543         RL.RoomsInterestedIn = NewHash(1, lFlathash);
 544         if (full_processing &&
 545             (GetNetworkedRoomNumbers(ctdl_netcfg_dir, RL.RoomsInterestedIn)==0))
 546         {
 547                 doing_queue = 0;
 548                 DeleteHash(&RL.RoomsInterestedIn);
 549                 if (RL.rplist == NULL)
 550                         return;
 551         }
 552         /* Load the IGnet Configuration into memory */
 553         working_ignetcfg = load_ignetcfg();
 554
 555         /*
 556          * Load the network map and filter list into memory.
 557          */
 558         if (!server_shutting_down)
 559                 the_netmap = read_network_map();
 560         if (!server_shutting_down)
 561                 load_network_filter_list();
 562
 563         /*
 564          * Go ahead and run the queue
 565          */
 566         if (full_processing && !server_shutting_down) {
 567                 syslog(LOG_DEBUG, "network: loading outbound queue\n");
 568                 CtdlForEachRoom(network_queue_interesting_rooms, &RL);
 569         }
 570
 571         if ((RL.rplist != NULL) && (!server_shutting_down)) {
 572                 RoomProcList *ptr, *cmp;
 573                 ptr = RL.rplist;
 574                 syslog(LOG_DEBUG, "network: running outbound queue\n");
 575                 while (ptr != NULL && !server_shutting_down) {
 576
 577                         cmp = ptr->next;
 578
 579                         while (cmp != NULL) {
 580                                 if ((cmp->namelen > 0) &&
 581                                     (cmp->key == ptr->key) &&
 582                                     (cmp->namelen == ptr->namelen) &&
 583                                     (strcmp(cmp->lcname, ptr->lcname) == 0))
 584                                 {
 585                                         cmp->namelen = 0;
 586                                 }
 587                                 cmp = cmp->next;
 588                         }
 589
 590                         if (ptr->namelen > 0) {
 591                                 network_spoolout_room(ptr,
 592                                                       working_ignetcfg,
 593                                                       the_netmap);
 594                         }
 595                         ptr = ptr->next;
 596                 }
 597         }
 598
 599         /* If there is anything in the inbound queue, process it */
 600         if (!server_shutting_down) {
 601                 network_do_spoolin(working_ignetcfg,
 602                                    the_netmap,
 603                                    &netmap_changed);
 604         }
 605
 606         /* Free the filter list in memory */
 607         free_netfilter_list();
 608
 609         /* Save the network map back to disk */
 610         if (netmap_changed) {
 611                 StrBuf *MapStr = SerializeNetworkMap(the_netmap);
 612                 CtdlPutSysConfig(IGNETMAP, SmashStrBuf(&MapStr));
 613         }
 614
 615         /* combine singe message files into one spool entry per remote node. */
 616         network_consolidate_spoolout(working_ignetcfg, the_netmap);
 617
 618         /* shut down. */
 619
 620         DeleteHash(&the_netmap);
 621
 622         DeleteHash(&working_ignetcfg);
 623
 624         syslog(LOG_DEBUG, "network: queue run completed\n");
 625
 626         if (full_processing) {
 627                 last_run = time(NULL);
 628         }
 629         DeleteHash(&RL.RoomsInterestedIn);
 630         destroy_network_queue_room(RL.rplist);
 631         doing_queue = 0;
 632 }
 633
 634
 635
 636
 637 int network_room_handler (struct ctdlroom *room)
 638 {
 639         network_queue_room(room, NULL);
 640         return 0;
 641 }
 642
 643 int NTTDebugEnabled = 0;
 644
 645 /*
 646  * network_talking_to()  --  concurrency checker
 647  */
 648 static HashList *nttlist = NULL;
 649 int network_talking_to(const char *nodename, long len, int operation) {
 650
 651         int retval = 0;
 652         HashPos *Pos = NULL;
 653         void *vdata;
 654
 655         begin_critical_section(S_NTTLIST);
 656
 657         switch(operation) {
 658
 659                 case NTT_ADD:
 660                         if (nttlist == NULL)
 661                                 nttlist = NewHash(1, NULL);
 662                         Put(nttlist, nodename, len, NewStrBufPlain(nodename, len), HFreeStrBuf);
 663                         if (NTTDebugEnabled) syslog(LOG_DEBUG, "nttlist: added <%s>\n", nodename);
 664                         break;
 665                 case NTT_REMOVE:
 666                         if ((nttlist == NULL) ||
 667                             (GetCount(nttlist) == 0))
 668                                 break;
 669                         Pos = GetNewHashPos(nttlist, 1);
 670                         if (GetHashPosFromKey (nttlist, nodename, len, Pos))
 671                                 DeleteEntryFromHash(nttlist, Pos);
 672                         DeleteHashPos(&Pos);
 673                         if (NTTDebugEnabled) syslog(LOG_DEBUG, "nttlist: removed <%s>\n", nodename);
 674
 675                         break;
 676
 677                 case NTT_CHECK:
 678                         if ((nttlist == NULL) ||
 679                             (GetCount(nttlist) == 0))
 680                                 break;
 681                         if (GetHash(nttlist, nodename, len, &vdata))
 682                                 retval ++;
 683                         if (NTTDebugEnabled) syslog(LOG_DEBUG, "nttlist: have [%d] <%s>\n", retval, nodename);
 684                         break;
 685         }
 686
 687         end_critical_section(S_NTTLIST);
 688         return(retval);
 689 }
 690
 691 void cleanup_nttlist(void)
 692 {
 693         begin_critical_section(S_NTTLIST);
 694         DeleteHash(&nttlist);
 695         end_critical_section(S_NTTLIST);
 696 }
 697
 698
 699
 700 void network_logout_hook(void)
 701 {
 702         CitContext *CCC = MyContext();
 703
 704         /*
 705          * If we were talking to a network node, we're not anymore...
 706          */
 707         if (!IsEmptyStr(CCC->net_node)) {
 708                 network_talking_to(CCC->net_node, strlen(CCC->net_node), NTT_REMOVE);
 709                 CCC->net_node[0] = '\0';
 710         }
 711 }
 712 void network_cleanup_function(void)
 713 {
 714         struct CitContext *CCC = CC;
 715
 716         if (!IsEmptyStr(CCC->net_node)) {
 717                 network_talking_to(CCC->net_node, strlen(CCC->net_node), NTT_REMOVE);
 718                 CCC->net_node[0] = '\0';
 719         }
 720 }
 721
 722
 723 /*
 724  * Module entry point
 725  */
 726 void SetNTTDebugEnabled(const int n)
 727 {
 728         NTTDebugEnabled = n;
 729 }
 730
 731 CTDL_MODULE_INIT(network)
 732 {
 733         if (!threading)
 734         {
 735                 CtdlRegisterDebugFlagHook(HKEY("networktalkingto"), SetNTTDebugEnabled, &NTTDebugEnabled);
 736                 CtdlRegisterCleanupHook(cleanup_nttlist);
 737                 CtdlRegisterSessionHook(network_cleanup_function, EVT_STOP);
 738                 CtdlRegisterSessionHook(network_logout_hook, EVT_LOGOUT);
 739                 CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
 740                 CtdlRegisterRoomHook(network_room_handler);
 741                 CtdlRegisterCleanupHook(destroy_network_queue_room_locked);
 742                 CtdlRegisterSessionHook(network_do_queue, EVT_TIMER);
 743         }
 744         return "network";
 745 }