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 int NetQDebugEnabled = 0;
  96 struct CitContext networker_spool_CC;
  97
  98 /* comes from lookup3.c from libcitadel... */
  99 extern uint32_t hashlittle( const void *key, size_t length, uint32_t initval);
 100
 101 typedef struct __roomlists {
 102         RoomProcList *rplist;
 103         HashList *RoomsInterestedIn;
 104 }roomlists;
 105 /*
 106  * When we do network processing, it's accomplished in two passes; one to
 107  * gather a list of rooms and one to actually do them.  It's ok that rplist
 108  * is global; we have a mutex that keeps it safe.
 109  */
 110 struct RoomProcList *rplist = NULL;
 111
 112 int GetNetworkedRoomNumbers(const char *DirName, HashList *DirList)
 113 {
 114         DIR *filedir = NULL;
 115         struct dirent *d;
 116         struct dirent *filedir_entry;
 117         long RoomNR;
 118         long Count = 0;
 119
 120         filedir = opendir (DirName);
 121         if (filedir == NULL) {
 122                 return 0;
 123         }
 124
 125         d = (struct dirent *)malloc(offsetof(struct dirent, d_name) + PATH_MAX + 1);
 126         if (d == NULL) {
 127                 return 0;
 128         }
 129
 130         while ((readdir_r(filedir, d, &filedir_entry) == 0) &&
 131                (filedir_entry != NULL))
 132         {
 133                 RoomNR = atol(filedir_entry->d_name);
 134                 if (RoomNR != 0) {
 135                         Count++;
 136                         Put(DirList, LKEY(RoomNR), &Count, reference_free_handler);
 137                 }
 138         }
 139         free(d);
 140         closedir(filedir);
 141         return Count;
 142 }
 143
 144
 145
 146
 147 /*
 148  * Check the use table.  This is a list of messages which have recently
 149  * arrived on the system.  It is maintained and queried to prevent the same
 150  * message from being entered into the database multiple times if it happens
 151  * to arrive multiple times by accident.
 152  */
 153 int network_usetable(struct CtdlMessage *msg)
 154 {
 155         struct CitContext *CCC = CC;
 156         char msgid[SIZ];
 157         struct cdbdata *cdbut;
 158         struct UseTable ut;
 159
 160         /* Bail out if we can't generate a message ID */
 161         if (msg == NULL) {
 162                 return(0);
 163         }
 164         if (msg->cm_fields['I'] == NULL) {
 165                 return(0);
 166         }
 167         if (IsEmptyStr(msg->cm_fields['I'])) {
 168                 return(0);
 169         }
 170
 171         /* Generate the message ID */
 172         strcpy(msgid, msg->cm_fields['I']);
 173         if (haschar(msgid, '@') == 0) {
 174                 strcat(msgid, "@");
 175                 if (msg->cm_fields['N'] != NULL) {
 176                         strcat(msgid, msg->cm_fields['N']);
 177                 }
 178                 else {
 179                         return(0);
 180                 }
 181         }
 182
 183         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 184         if (cdbut != NULL) {
 185                 cdb_free(cdbut);
 186                 QN_syslog(LOG_DEBUG, "network_usetable() : we already have %s\n", msgid);
 187                 return(1);
 188         }
 189
 190         /* If we got to this point, it's unique: add it. */
 191         strcpy(ut.ut_msgid, msgid);
 192         ut.ut_timestamp = time(NULL);
 193         cdb_store(CDB_USETABLE, msgid, strlen(msgid), &ut, sizeof(struct UseTable) );
 194         return(0);
 195 }
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206 /*
 207  * Send the *entire* contents of the current room to one specific network node,
 208  * ignoring anything we know about which messages have already undergone
 209  * network processing.  This can be used to bring a new node into sync.
 210  */
 211 int network_sync_to(char *target_node, long len)
 212 {
 213         struct CitContext *CCC = CC;
 214         SpoolControl sc;
 215         int num_spooled = 0;
 216         int found_node = 0;
 217         char buf[256];
 218         char sc_type[256];
 219         char sc_node[256];
 220         char sc_room[256];
 221         char filename[PATH_MAX];
 222         FILE *fp;
 223
 224         /* Grab the configuration line we're looking for */
 225         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 226         begin_critical_section(S_NETCONFIGS);
 227         fp = fopen(filename, "r");
 228         if (fp == NULL) {
 229                 end_critical_section(S_NETCONFIGS);
 230                 return(-1);
 231         }
 232         while (fgets(buf, sizeof buf, fp) != NULL)
 233         {
 234                 buf[strlen(buf)-1] = 0;
 235
 236                 extract_token(sc_type, buf, 0, '|', sizeof sc_type);
 237                 if (strcasecmp(sc_type, "ignet_push_share"))
 238                         continue;
 239
 240                 extract_token(sc_node, buf, 1, '|', sizeof sc_node);
 241                 if (strcasecmp(sc_node, target_node))
 242                         continue;
 243
 244                 extract_token(sc_room, buf, 2, '|', sizeof sc_room);
 245                 found_node = 1;
 246
 247                 /* Concise syntax because we don't need a full linked-list */
 248                 memset(&sc, 0, sizeof(SpoolControl));
 249                 sc.ignet_push_shares = (maplist *)
 250                         malloc(sizeof(maplist));
 251                 sc.ignet_push_shares->next = NULL;
 252                 safestrncpy(sc.ignet_push_shares->remote_nodename,
 253                             sc_node,
 254                             sizeof sc.ignet_push_shares->remote_nodename);
 255                 safestrncpy(sc.ignet_push_shares->remote_roomname,
 256                             sc_room,
 257                             sizeof sc.ignet_push_shares->remote_roomname);
 258         }
 259         fclose(fp);
 260         end_critical_section(S_NETCONFIGS);
 261
 262         if (!found_node) {
 263                 free(sc.ignet_push_shares);
 264                 return(-1);
 265         }
 266
 267         sc.working_ignetcfg = load_ignetcfg();
 268         sc.the_netmap = read_network_map();
 269
 270         /* Send ALL messages */
 271         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL,
 272                 network_spool_msg, &sc);
 273
 274         /* Concise cleanup because we know there's only one node in the sc */
 275         free(sc.ignet_push_shares);
 276
 277         DeleteHash(&sc.working_ignetcfg);
 278         DeleteHash(&sc.the_netmap);
 279
 280         QN_syslog(LOG_NOTICE, "Synchronized %d messages to <%s>\n",
 281                   num_spooled, target_node);
 282         return(num_spooled);
 283 }
 284
 285
 286 /*
 287  * Implements the NSYN command
 288  */
 289 void cmd_nsyn(char *argbuf) {
 290         int num_spooled;
 291         long len;
 292         char target_node[256];
 293
 294         if (CtdlAccessCheck(ac_aide)) return;
 295
 296         len = extract_token(target_node, argbuf, 0, '|', sizeof target_node);
 297         num_spooled = network_sync_to(target_node, len);
 298         if (num_spooled >= 0) {
 299                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
 300         }
 301         else {
 302                 cprintf("%d No such room/node share exists.\n",
 303                         ERROR + ROOM_NOT_FOUND);
 304         }
 305 }
 306
 307
 308
 309 /*
 310  * Batch up and send all outbound traffic from the current room
 311  */
 312 void network_queue_interesting_rooms(struct ctdlroom *qrbuf, void *data) {
 313         int i;
 314         struct RoomProcList *ptr;
 315         long QRNum = qrbuf->QRnumber;
 316         void *v;
 317         roomlists *RP = (roomlists*) data;
 318
 319         if (!GetHash(RP->RoomsInterestedIn, LKEY(QRNum), &v))
 320                 return;
 321
 322         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
 323         if (ptr == NULL) return;
 324
 325         ptr->namelen = strlen(qrbuf->QRname);
 326         if (ptr->namelen > ROOMNAMELEN)
 327                 ptr->namelen = ROOMNAMELEN - 1;
 328
 329         memcpy (ptr->name, qrbuf->QRname, ptr->namelen);
 330         ptr->name[ptr->namelen] = '\0';
 331         ptr->QRNum = qrbuf->QRnumber;
 332
 333         for (i = 0; i < ptr->namelen; i++)
 334         {
 335                 ptr->lcname[i] = tolower(ptr->name[i]);
 336         }
 337
 338         ptr->lcname[ptr->namelen] = '\0';
 339         ptr->key = hashlittle(ptr->lcname, ptr->namelen, 9872345);
 340         ptr->next = RP->rplist;
 341         RP->rplist = ptr;
 342 }
 343
 344 /*
 345  * Batch up and send all outbound traffic from the current room
 346  */
 347 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
 348         int i;
 349         struct RoomProcList *ptr;
 350
 351         if (qrbuf->QRdefaultview == VIEW_QUEUE)
 352                 return;
 353         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
 354         if (ptr == NULL) return;
 355
 356         ptr->namelen = strlen(qrbuf->QRname);
 357         if (ptr->namelen > ROOMNAMELEN)
 358                 ptr->namelen = ROOMNAMELEN - 1;
 359
 360         memcpy (ptr->name, qrbuf->QRname, ptr->namelen);
 361         ptr->name[ptr->namelen] = '\0';
 362         ptr->QRNum = qrbuf->QRnumber;
 363
 364         for (i = 0; i < ptr->namelen; i++)
 365         {
 366                 ptr->lcname[i] = tolower(ptr->name[i]);
 367         }
 368         ptr->lcname[ptr->namelen] = '\0';
 369         ptr->key = hashlittle(ptr->lcname, ptr->namelen, 9872345);
 370
 371         begin_critical_section(S_RPLIST);
 372         ptr->next = rplist;
 373         rplist = ptr;
 374         end_critical_section(S_RPLIST);
 375 }
 376
 377 void destroy_network_queue_room(RoomProcList *rplist)
 378 {
 379         struct RoomProcList *cur, *p;
 380
 381         cur = rplist;
 382         while (cur != NULL)
 383         {
 384                 p = cur->next;
 385                 free (cur);
 386                 cur = p;
 387         }
 388 }
 389
 390 void destroy_network_queue_room_locked (void)
 391 {
 392         begin_critical_section(S_RPLIST);
 393         destroy_network_queue_room(rplist);
 394         end_critical_section(S_RPLIST);
 395 }
 396
 397
 398
 399 /*
 400  * Bounce a message back to the sender
 401  */
 402 void network_bounce(struct CtdlMessage *msg, char *reason)
 403 {
 404         struct CitContext *CCC = CC;
 405         char *oldpath = NULL;
 406         char buf[SIZ];
 407         char bouncesource[SIZ];
 408         char recipient[SIZ];
 409         struct recptypes *valid = NULL;
 410         char force_room[ROOMNAMELEN];
 411         static int serialnum = 0;
 412         size_t size;
 413
 414         QNM_syslog(LOG_DEBUG, "entering network_bounce()\n");
 415
 416         if (msg == NULL) return;
 417
 418         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
 419
 420         /*
 421          * Give it a fresh message ID
 422          */
 423         if (msg->cm_fields['I'] != NULL) {
 424                 free(msg->cm_fields['I']);
 425         }
 426         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
 427                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
 428         msg->cm_fields['I'] = strdup(buf);
 429
 430         /*
 431          * FIXME ... right now we're just sending a bounce; we really want to
 432          * include the text of the bounced message.
 433          */
 434         if (msg->cm_fields['M'] != NULL) {
 435                 free(msg->cm_fields['M']);
 436         }
 437         msg->cm_fields['M'] = strdup(reason);
 438         msg->cm_format_type = 0;
 439
 440         /*
 441          * Turn the message around
 442          */
 443         if (msg->cm_fields['R'] == NULL) {
 444                 free(msg->cm_fields['R']);
 445         }
 446
 447         if (msg->cm_fields['D'] == NULL) {
 448                 free(msg->cm_fields['D']);
 449         }
 450
 451         snprintf(recipient, sizeof recipient, "%s@%s",
 452                 msg->cm_fields['A'], msg->cm_fields['N']);
 453
 454         if (msg->cm_fields['A'] == NULL) {
 455                 free(msg->cm_fields['A']);
 456         }
 457
 458         if (msg->cm_fields['N'] == NULL) {
 459                 free(msg->cm_fields['N']);
 460         }
 461
 462         if (msg->cm_fields['U'] == NULL) {
 463                 free(msg->cm_fields['U']);
 464         }
 465
 466         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
 467         msg->cm_fields['N'] = strdup(config.c_nodename);
 468         msg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
 469
 470         /* prepend our node to the path */
 471         if (msg->cm_fields['P'] != NULL) {
 472                 oldpath = msg->cm_fields['P'];
 473                 msg->cm_fields['P'] = NULL;
 474         }
 475         else {
 476                 oldpath = strdup("unknown_user");
 477         }
 478         size = strlen(oldpath) + SIZ;
 479         msg->cm_fields['P'] = malloc(size);
 480         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
 481         free(oldpath);
 482
 483         /* Now submit the message */
 484         valid = validate_recipients(recipient, NULL, 0);
 485         if (valid != NULL) if (valid->num_error != 0) {
 486                 free_recipients(valid);
 487                 valid = NULL;
 488         }
 489         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
 490                 strcpy(force_room, config.c_aideroom);
 491         }
 492         else {
 493                 strcpy(force_room, "");
 494         }
 495         if ( (valid == NULL) && IsEmptyStr(force_room) ) {
 496                 strcpy(force_room, config.c_aideroom);
 497         }
 498         CtdlSubmitMsg(msg, valid, force_room, 0);
 499
 500         /* Clean up */
 501         if (valid != NULL) free_recipients(valid);
 502         CtdlFreeMessage(msg);
 503         QNM_syslog(LOG_DEBUG, "leaving network_bounce()\n");
 504 }
 505
 506
 507
 508
 509
 510
 511
 512 /*
 513  * network_do_queue()
 514  *
 515  * Run through the rooms doing various types of network stuff.
 516  */
 517 void network_do_queue(void)
 518 {
 519         struct CitContext *CCC = CC;
 520         static int doing_queue = 0;
 521         static time_t last_run = 0L;
 522         int full_processing = 1;
 523         HashList *working_ignetcfg;
 524         HashList *the_netmap = NULL;
 525         int netmap_changed = 0;
 526         roomlists RL;
 527
 528         /*
 529          * Run the full set of processing tasks no more frequently
 530          * than once every n seconds
 531          */
 532         if ( (time(NULL) - last_run) < config.c_net_freq ) {
 533                 full_processing = 0;
 534                 syslog(LOG_DEBUG, "Network full processing in %ld seconds.\n",
 535                        config.c_net_freq - (time(NULL)- last_run)
 536                 );
 537         }
 538
 539         /*
 540          * This is a simple concurrency check to make sure only one queue run
 541          * is done at a time.  We could do this with a mutex, but since we
 542          * don't really require extremely fine granularity here, we'll do it
 543          * with a static variable instead.
 544          */
 545         if (doing_queue) {
 546                 return;
 547         }
 548         doing_queue = 1;
 549
 550         become_session(&networker_spool_CC);
 551         begin_critical_section(S_RPLIST);
 552         RL.rplist = rplist;
 553         rplist = NULL;
 554         end_critical_section(S_RPLIST);
 555
 556         RL.RoomsInterestedIn = NewHash(1, lFlathash);
 557         if (full_processing &&
 558             (GetNetworkedRoomNumbers(ctdl_netcfg_dir, RL.RoomsInterestedIn)==0))
 559         {
 560                 doing_queue = 0;
 561                 DeleteHash(&RL.RoomsInterestedIn);
 562                 if (RL.rplist == NULL)
 563                         return;
 564         }
 565         /* Load the IGnet Configuration into memory */
 566         working_ignetcfg = load_ignetcfg();
 567
 568         /*
 569          * Load the network map and filter list into memory.
 570          */
 571         if (!server_shutting_down)
 572                 the_netmap = read_network_map();
 573         if (!server_shutting_down)
 574                 load_network_filter_list();
 575
 576         /*
 577          * Go ahead and run the queue
 578          */
 579         if (full_processing && !server_shutting_down) {
 580                 QNM_syslog(LOG_DEBUG, "network: loading outbound queue");
 581                 CtdlForEachRoom(network_queue_interesting_rooms, &RL);
 582         }
 583
 584         if ((RL.rplist != NULL) && (!server_shutting_down)) {
 585                 RoomProcList *ptr, *cmp;
 586                 ptr = RL.rplist;
 587                 QNM_syslog(LOG_DEBUG, "network: running outbound queue");
 588                 while (ptr != NULL && !server_shutting_down) {
 589
 590                         cmp = ptr->next;
 591
 592                         while (cmp != NULL) {
 593                                 if ((cmp->namelen > 0) &&
 594                                     (cmp->key == ptr->key) &&
 595                                     (cmp->namelen == ptr->namelen) &&
 596                                     (strcmp(cmp->lcname, ptr->lcname) == 0))
 597                                 {
 598                                         cmp->namelen = 0;
 599                                 }
 600                                 cmp = cmp->next;
 601                         }
 602
 603                         if (ptr->namelen > 0) {
 604                                 network_spoolout_room(ptr,
 605                                                       working_ignetcfg,
 606                                                       the_netmap);
 607                         }
 608                         ptr = ptr->next;
 609                 }
 610         }
 611
 612         /* If there is anything in the inbound queue, process it */
 613         if (!server_shutting_down) {
 614                 network_do_spoolin(working_ignetcfg,
 615                                    the_netmap,
 616                                    &netmap_changed);
 617         }
 618
 619         /* Free the filter list in memory */
 620         free_netfilter_list();
 621
 622         /* Save the network map back to disk */
 623         if (netmap_changed) {
 624                 StrBuf *MapStr = SerializeNetworkMap(the_netmap);
 625                 CtdlPutSysConfig(IGNETMAP, SmashStrBuf(&MapStr));
 626         }
 627
 628         /* combine singe message files into one spool entry per remote node. */
 629         network_consolidate_spoolout(working_ignetcfg, the_netmap);
 630
 631         /* shut down. */
 632
 633         DeleteHash(&the_netmap);
 634
 635         DeleteHash(&working_ignetcfg);
 636
 637         QNM_syslog(LOG_DEBUG, "network: queue run completed");
 638
 639         if (full_processing) {
 640                 last_run = time(NULL);
 641         }
 642         DeleteHash(&RL.RoomsInterestedIn);
 643         destroy_network_queue_room(RL.rplist);
 644         doing_queue = 0;
 645 }
 646
 647
 648
 649
 650 int network_room_handler (struct ctdlroom *room)
 651 {
 652         network_queue_room(room, NULL);
 653         return 0;
 654 }
 655
 656 int NTTDebugEnabled = 0;
 657
 658 /*
 659  * network_talking_to()  --  concurrency checker
 660  */
 661 static HashList *nttlist = NULL;
 662 int network_talking_to(const char *nodename, long len, int operation) {
 663
 664         int retval = 0;
 665         HashPos *Pos = NULL;
 666         void *vdata;
 667
 668         begin_critical_section(S_NTTLIST);
 669
 670         switch(operation) {
 671
 672                 case NTT_ADD:
 673                         if (nttlist == NULL)
 674                                 nttlist = NewHash(1, NULL);
 675                         Put(nttlist, nodename, len, NewStrBufPlain(nodename, len), HFreeStrBuf);
 676                         if (NTTDebugEnabled) syslog(LOG_DEBUG, "nttlist: added <%s>\n", nodename);
 677                         break;
 678                 case NTT_REMOVE:
 679                         if ((nttlist == NULL) ||
 680                             (GetCount(nttlist) == 0))
 681                                 break;
 682                         Pos = GetNewHashPos(nttlist, 1);
 683                         if (GetHashPosFromKey (nttlist, nodename, len, Pos))
 684                                 DeleteEntryFromHash(nttlist, Pos);
 685                         DeleteHashPos(&Pos);
 686                         if (NTTDebugEnabled) syslog(LOG_DEBUG, "nttlist: removed <%s>\n", nodename);
 687
 688                         break;
 689
 690                 case NTT_CHECK:
 691                         if ((nttlist == NULL) ||
 692                             (GetCount(nttlist) == 0))
 693                                 break;
 694                         if (GetHash(nttlist, nodename, len, &vdata))
 695                                 retval ++;
 696                         if (NTTDebugEnabled) syslog(LOG_DEBUG, "nttlist: have [%d] <%s>\n", retval, nodename);
 697                         break;
 698         }
 699
 700         end_critical_section(S_NTTLIST);
 701         return(retval);
 702 }
 703
 704 void cleanup_nttlist(void)
 705 {
 706         begin_critical_section(S_NTTLIST);
 707         DeleteHash(&nttlist);
 708         end_critical_section(S_NTTLIST);
 709 }
 710
 711
 712
 713 void network_logout_hook(void)
 714 {
 715         CitContext *CCC = MyContext();
 716
 717         /*
 718          * If we were talking to a network node, we're not anymore...
 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 void network_cleanup_function(void)
 726 {
 727         struct CitContext *CCC = CC;
 728
 729         if (!IsEmptyStr(CCC->net_node)) {
 730                 network_talking_to(CCC->net_node, strlen(CCC->net_node), NTT_REMOVE);
 731                 CCC->net_node[0] = '\0';
 732         }
 733 }
 734
 735
 736 /*
 737  * Module entry point
 738  */
 739 void SetNTTDebugEnabled(const int n)
 740 {
 741         NTTDebugEnabled = n;
 742 }
 743 void SetNetQDebugEnabled(const int n)
 744 {
 745         NetQDebugEnabled = n;
 746 }
 747
 748 CTDL_MODULE_INIT(network)
 749 {
 750         if (!threading)
 751         {
 752                 CtdlFillSystemContext(&networker_spool_CC, "CitNetSpool");
 753                 CtdlRegisterDebugFlagHook(HKEY("networktalkingto"), SetNTTDebugEnabled, &NTTDebugEnabled);
 754                 CtdlRegisterDebugFlagHook(HKEY("networkqueue"), SetNetQDebugEnabled, &NetQDebugEnabled);
 755                 CtdlRegisterCleanupHook(cleanup_nttlist);
 756                 CtdlRegisterSessionHook(network_cleanup_function, EVT_STOP, PRIO_STOP + 30);
 757                 CtdlRegisterSessionHook(network_logout_hook, EVT_LOGOUT, PRIO_LOGOUT + 10);
 758                 CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
 759                 CtdlRegisterRoomHook(network_room_handler);
 760                 CtdlRegisterCleanupHook(destroy_network_queue_room_locked);
 761                 CtdlRegisterSessionHook(network_do_queue, EVT_TIMER, PRIO_QUEUE + 10);
 762         }
 763         return "network";
 764 }