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) return(-1);
 263
 264         sc.working_ignetcfg = load_ignetcfg();
 265         sc.the_netmap = read_network_map();
 266
 267         /* Send ALL messages */
 268         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL,
 269                 network_spool_msg, &sc);
 270
 271         /* Concise cleanup because we know there's only one node in the sc */
 272         free(sc.ignet_push_shares);
 273
 274         DeleteHash(&sc.working_ignetcfg);
 275         DeleteHash(&sc.the_netmap);
 276
 277         QN_syslog(LOG_NOTICE, "Synchronized %d messages to <%s>\n",
 278                   num_spooled, target_node);
 279         return(num_spooled);
 280 }
 281
 282
 283 /*
 284  * Implements the NSYN command
 285  */
 286 void cmd_nsyn(char *argbuf) {
 287         int num_spooled;
 288         long len;
 289         char target_node[256];
 290
 291         if (CtdlAccessCheck(ac_aide)) return;
 292
 293         len = extract_token(target_node, argbuf, 0, '|', sizeof target_node);
 294         num_spooled = network_sync_to(target_node, len);
 295         if (num_spooled >= 0) {
 296                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
 297         }
 298         else {
 299                 cprintf("%d No such room/node share exists.\n",
 300                         ERROR + ROOM_NOT_FOUND);
 301         }
 302 }
 303
 304
 305
 306 /*
 307  * Batch up and send all outbound traffic from the current room
 308  */
 309 void network_queue_interesting_rooms(struct ctdlroom *qrbuf, void *data) {
 310         int i;
 311         struct RoomProcList *ptr;
 312         long QRNum = qrbuf->QRnumber;
 313         void *v;
 314         roomlists *RP = (roomlists*) data;
 315
 316         if (!GetHash(RP->RoomsInterestedIn, LKEY(QRNum), &v))
 317                 return;
 318
 319         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
 320         if (ptr == NULL) return;
 321
 322         ptr->namelen = strlen(qrbuf->QRname);
 323         if (ptr->namelen > ROOMNAMELEN)
 324                 ptr->namelen = ROOMNAMELEN - 1;
 325
 326         memcpy (ptr->name, qrbuf->QRname, ptr->namelen);
 327         ptr->name[ptr->namelen] = '\0';
 328         ptr->QRNum = qrbuf->QRnumber;
 329
 330         for (i = 0; i < ptr->namelen; i++)
 331         {
 332                 ptr->lcname[i] = tolower(ptr->name[i]);
 333         }
 334
 335         ptr->lcname[ptr->namelen] = '\0';
 336         ptr->key = hashlittle(ptr->lcname, ptr->namelen, 9872345);
 337         ptr->next = RP->rplist;
 338         RP->rplist = ptr;
 339 }
 340
 341 /*
 342  * Batch up and send all outbound traffic from the current room
 343  */
 344 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
 345         int i;
 346         struct RoomProcList *ptr;
 347
 348         if (qrbuf->QRdefaultview == VIEW_QUEUE)
 349                 return;
 350         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
 351         if (ptr == NULL) return;
 352
 353         ptr->namelen = strlen(qrbuf->QRname);
 354         if (ptr->namelen > ROOMNAMELEN)
 355                 ptr->namelen = ROOMNAMELEN - 1;
 356
 357         memcpy (ptr->name, qrbuf->QRname, ptr->namelen);
 358         ptr->name[ptr->namelen] = '\0';
 359         ptr->QRNum = qrbuf->QRnumber;
 360
 361         for (i = 0; i < ptr->namelen; i++)
 362         {
 363                 ptr->lcname[i] = tolower(ptr->name[i]);
 364         }
 365         ptr->lcname[ptr->namelen] = '\0';
 366         ptr->key = hashlittle(ptr->lcname, ptr->namelen, 9872345);
 367
 368         begin_critical_section(S_RPLIST);
 369         ptr->next = rplist;
 370         rplist = ptr;
 371         end_critical_section(S_RPLIST);
 372 }
 373
 374 void destroy_network_queue_room(RoomProcList *rplist)
 375 {
 376         struct RoomProcList *cur, *p;
 377
 378         cur = rplist;
 379         while (cur != NULL)
 380         {
 381                 p = cur->next;
 382                 free (cur);
 383                 cur = p;
 384         }
 385 }
 386
 387 void destroy_network_queue_room_locked (void)
 388 {
 389         begin_critical_section(S_RPLIST);
 390         destroy_network_queue_room(rplist);
 391         end_critical_section(S_RPLIST);
 392 }
 393
 394
 395
 396 /*
 397  * Bounce a message back to the sender
 398  */
 399 void network_bounce(struct CtdlMessage *msg, char *reason)
 400 {
 401         struct CitContext *CCC = CC;
 402         char *oldpath = NULL;
 403         char buf[SIZ];
 404         char bouncesource[SIZ];
 405         char recipient[SIZ];
 406         struct recptypes *valid = NULL;
 407         char force_room[ROOMNAMELEN];
 408         static int serialnum = 0;
 409         size_t size;
 410
 411         QNM_syslog(LOG_DEBUG, "entering network_bounce()\n");
 412
 413         if (msg == NULL) return;
 414
 415         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
 416
 417         /*
 418          * Give it a fresh message ID
 419          */
 420         if (msg->cm_fields['I'] != NULL) {
 421                 free(msg->cm_fields['I']);
 422         }
 423         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
 424                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
 425         msg->cm_fields['I'] = strdup(buf);
 426
 427         /*
 428          * FIXME ... right now we're just sending a bounce; we really want to
 429          * include the text of the bounced message.
 430          */
 431         if (msg->cm_fields['M'] != NULL) {
 432                 free(msg->cm_fields['M']);
 433         }
 434         msg->cm_fields['M'] = strdup(reason);
 435         msg->cm_format_type = 0;
 436
 437         /*
 438          * Turn the message around
 439          */
 440         if (msg->cm_fields['R'] == NULL) {
 441                 free(msg->cm_fields['R']);
 442         }
 443
 444         if (msg->cm_fields['D'] == NULL) {
 445                 free(msg->cm_fields['D']);
 446         }
 447
 448         snprintf(recipient, sizeof recipient, "%s@%s",
 449                 msg->cm_fields['A'], msg->cm_fields['N']);
 450
 451         if (msg->cm_fields['A'] == NULL) {
 452                 free(msg->cm_fields['A']);
 453         }
 454
 455         if (msg->cm_fields['N'] == NULL) {
 456                 free(msg->cm_fields['N']);
 457         }
 458
 459         if (msg->cm_fields['U'] == NULL) {
 460                 free(msg->cm_fields['U']);
 461         }
 462
 463         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
 464         msg->cm_fields['N'] = strdup(config.c_nodename);
 465         msg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
 466
 467         /* prepend our node to the path */
 468         if (msg->cm_fields['P'] != NULL) {
 469                 oldpath = msg->cm_fields['P'];
 470                 msg->cm_fields['P'] = NULL;
 471         }
 472         else {
 473                 oldpath = strdup("unknown_user");
 474         }
 475         size = strlen(oldpath) + SIZ;
 476         msg->cm_fields['P'] = malloc(size);
 477         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
 478         free(oldpath);
 479
 480         /* Now submit the message */
 481         valid = validate_recipients(recipient, NULL, 0);
 482         if (valid != NULL) if (valid->num_error != 0) {
 483                 free_recipients(valid);
 484                 valid = NULL;
 485         }
 486         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
 487                 strcpy(force_room, config.c_aideroom);
 488         }
 489         else {
 490                 strcpy(force_room, "");
 491         }
 492         if ( (valid == NULL) && IsEmptyStr(force_room) ) {
 493                 strcpy(force_room, config.c_aideroom);
 494         }
 495         CtdlSubmitMsg(msg, valid, force_room, 0);
 496
 497         /* Clean up */
 498         if (valid != NULL) free_recipients(valid);
 499         CtdlFreeMessage(msg);
 500         QNM_syslog(LOG_DEBUG, "leaving network_bounce()\n");
 501 }
 502
 503
 504
 505
 506
 507
 508
 509 /*
 510  * network_do_queue()
 511  *
 512  * Run through the rooms doing various types of network stuff.
 513  */
 514 void network_do_queue(void)
 515 {
 516         struct CitContext *CCC = CC;
 517         static int doing_queue = 0;
 518         static time_t last_run = 0L;
 519         int full_processing = 1;
 520         HashList *working_ignetcfg;
 521         HashList *the_netmap = NULL;
 522         int netmap_changed = 0;
 523         roomlists RL;
 524
 525         /*
 526          * Run the full set of processing tasks no more frequently
 527          * than once every n seconds
 528          */
 529         if ( (time(NULL) - last_run) < config.c_net_freq ) {
 530                 full_processing = 0;
 531                 syslog(LOG_DEBUG, "Network full processing in %ld seconds.\n",
 532                        config.c_net_freq - (time(NULL)- last_run)
 533                 );
 534         }
 535
 536         /*
 537          * This is a simple concurrency check to make sure only one queue run
 538          * is done at a time.  We could do this with a mutex, but since we
 539          * don't really require extremely fine granularity here, we'll do it
 540          * with a static variable instead.
 541          */
 542         if (doing_queue) {
 543                 return;
 544         }
 545         doing_queue = 1;
 546
 547         become_session(&networker_spool_CC);
 548         begin_critical_section(S_RPLIST);
 549         RL.rplist = rplist;
 550         rplist = NULL;
 551         end_critical_section(S_RPLIST);
 552
 553         RL.RoomsInterestedIn = NewHash(1, lFlathash);
 554         if (full_processing &&
 555             (GetNetworkedRoomNumbers(ctdl_netcfg_dir, RL.RoomsInterestedIn)==0))
 556         {
 557                 doing_queue = 0;
 558                 DeleteHash(&RL.RoomsInterestedIn);
 559                 if (RL.rplist == NULL)
 560                         return;
 561         }
 562         /* Load the IGnet Configuration into memory */
 563         working_ignetcfg = load_ignetcfg();
 564
 565         /*
 566          * Load the network map and filter list into memory.
 567          */
 568         if (!server_shutting_down)
 569                 the_netmap = read_network_map();
 570         if (!server_shutting_down)
 571                 load_network_filter_list();
 572
 573         /*
 574          * Go ahead and run the queue
 575          */
 576         if (full_processing && !server_shutting_down) {
 577                 QNM_syslog(LOG_DEBUG, "network: loading outbound queue");
 578                 CtdlForEachRoom(network_queue_interesting_rooms, &RL);
 579         }
 580
 581         if ((RL.rplist != NULL) && (!server_shutting_down)) {
 582                 RoomProcList *ptr, *cmp;
 583                 ptr = RL.rplist;
 584                 QNM_syslog(LOG_DEBUG, "network: running outbound queue");
 585                 while (ptr != NULL && !server_shutting_down) {
 586
 587                         cmp = ptr->next;
 588
 589                         while (cmp != NULL) {
 590                                 if ((cmp->namelen > 0) &&
 591                                     (cmp->key == ptr->key) &&
 592                                     (cmp->namelen == ptr->namelen) &&
 593                                     (strcmp(cmp->lcname, ptr->lcname) == 0))
 594                                 {
 595                                         cmp->namelen = 0;
 596                                 }
 597                                 cmp = cmp->next;
 598                         }
 599
 600                         if (ptr->namelen > 0) {
 601                                 network_spoolout_room(ptr,
 602                                                       working_ignetcfg,
 603                                                       the_netmap);
 604                         }
 605                         ptr = ptr->next;
 606                 }
 607         }
 608
 609         /* If there is anything in the inbound queue, process it */
 610         if (!server_shutting_down) {
 611                 network_do_spoolin(working_ignetcfg,
 612                                    the_netmap,
 613                                    &netmap_changed);
 614         }
 615
 616         /* Free the filter list in memory */
 617         free_netfilter_list();
 618
 619         /* Save the network map back to disk */
 620         if (netmap_changed) {
 621                 StrBuf *MapStr = SerializeNetworkMap(the_netmap);
 622                 CtdlPutSysConfig(IGNETMAP, SmashStrBuf(&MapStr));
 623         }
 624
 625         /* combine singe message files into one spool entry per remote node. */
 626         network_consolidate_spoolout(working_ignetcfg, the_netmap);
 627
 628         /* shut down. */
 629
 630         DeleteHash(&the_netmap);
 631
 632         DeleteHash(&working_ignetcfg);
 633
 634         QNM_syslog(LOG_DEBUG, "network: queue run completed");
 635
 636         if (full_processing) {
 637                 last_run = time(NULL);
 638         }
 639         DeleteHash(&RL.RoomsInterestedIn);
 640         destroy_network_queue_room(RL.rplist);
 641         doing_queue = 0;
 642 }
 643
 644
 645
 646
 647 int network_room_handler (struct ctdlroom *room)
 648 {
 649         network_queue_room(room, NULL);
 650         return 0;
 651 }
 652
 653 int NTTDebugEnabled = 0;
 654
 655 /*
 656  * network_talking_to()  --  concurrency checker
 657  */
 658 static HashList *nttlist = NULL;
 659 int network_talking_to(const char *nodename, long len, int operation) {
 660
 661         int retval = 0;
 662         HashPos *Pos = NULL;
 663         void *vdata;
 664
 665         begin_critical_section(S_NTTLIST);
 666
 667         switch(operation) {
 668
 669                 case NTT_ADD:
 670                         if (nttlist == NULL)
 671                                 nttlist = NewHash(1, NULL);
 672                         Put(nttlist, nodename, len, NewStrBufPlain(nodename, len), HFreeStrBuf);
 673                         if (NTTDebugEnabled) syslog(LOG_DEBUG, "nttlist: added <%s>\n", nodename);
 674                         break;
 675                 case NTT_REMOVE:
 676                         if ((nttlist == NULL) ||
 677                             (GetCount(nttlist) == 0))
 678                                 break;
 679                         Pos = GetNewHashPos(nttlist, 1);
 680                         if (GetHashPosFromKey (nttlist, nodename, len, Pos))
 681                                 DeleteEntryFromHash(nttlist, Pos);
 682                         DeleteHashPos(&Pos);
 683                         if (NTTDebugEnabled) syslog(LOG_DEBUG, "nttlist: removed <%s>\n", nodename);
 684
 685                         break;
 686
 687                 case NTT_CHECK:
 688                         if ((nttlist == NULL) ||
 689                             (GetCount(nttlist) == 0))
 690                                 break;
 691                         if (GetHash(nttlist, nodename, len, &vdata))
 692                                 retval ++;
 693                         if (NTTDebugEnabled) syslog(LOG_DEBUG, "nttlist: have [%d] <%s>\n", retval, nodename);
 694                         break;
 695         }
 696
 697         end_critical_section(S_NTTLIST);
 698         return(retval);
 699 }
 700
 701 void cleanup_nttlist(void)
 702 {
 703         begin_critical_section(S_NTTLIST);
 704         DeleteHash(&nttlist);
 705         end_critical_section(S_NTTLIST);
 706 }
 707
 708
 709
 710 void network_logout_hook(void)
 711 {
 712         CitContext *CCC = MyContext();
 713
 714         /*
 715          * If we were talking to a network node, we're not anymore...
 716          */
 717         if (!IsEmptyStr(CCC->net_node)) {
 718                 network_talking_to(CCC->net_node, strlen(CCC->net_node), NTT_REMOVE);
 719                 CCC->net_node[0] = '\0';
 720         }
 721 }
 722 void network_cleanup_function(void)
 723 {
 724         struct CitContext *CCC = CC;
 725
 726         if (!IsEmptyStr(CCC->net_node)) {
 727                 network_talking_to(CCC->net_node, strlen(CCC->net_node), NTT_REMOVE);
 728                 CCC->net_node[0] = '\0';
 729         }
 730 }
 731
 732
 733 /*
 734  * Module entry point
 735  */
 736 void SetNTTDebugEnabled(const int n)
 737 {
 738         NTTDebugEnabled = n;
 739 }
 740 void SetNetQDebugEnabled(const int n)
 741 {
 742         NetQDebugEnabled = n;
 743 }
 744
 745 CTDL_MODULE_INIT(network)
 746 {
 747         if (!threading)
 748         {
 749                 CtdlFillSystemContext(&networker_spool_CC, "CitNetSpool");
 750                 CtdlRegisterDebugFlagHook(HKEY("networktalkingto"), SetNTTDebugEnabled, &NTTDebugEnabled);
 751                 CtdlRegisterDebugFlagHook(HKEY("networkqueue"), SetNetQDebugEnabled, &NetQDebugEnabled);
 752                 CtdlRegisterCleanupHook(cleanup_nttlist);
 753                 CtdlRegisterSessionHook(network_cleanup_function, EVT_STOP, PRIO_STOP + 30);
 754                 CtdlRegisterSessionHook(network_logout_hook, EVT_LOGOUT, PRIO_LOGOUT + 10);
 755                 CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
 756                 CtdlRegisterRoomHook(network_room_handler);
 757                 CtdlRegisterCleanupHook(destroy_network_queue_room_locked);
 758                 CtdlRegisterSessionHook(network_do_queue, EVT_TIMER, PRIO_QUEUE + 10);
 759         }
 760         return "network";
 761 }