citadel/serv_network.c

   1 /*
   2  * $Id$
   3  *
   4  * This module handles shared rooms, inter-Citadel mail, and outbound
   5  * mailing list processing.
   6  *
   7  * Copyright (C) 2000-2005 by Art Cancro and others.
   8  * This code is released under the terms of the GNU General Public License.
   9  *
  10  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  11  * This is a fairly high-level type of critical section.  It ensures that no
  12  * two threads work on the netconfigs files at the same time.  Since we do
  13  * so many things inside these, here are the rules:
  14  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  15  *  2. Do *not* perform any I/O with the client during these sections.
  16  *
  17  */
  18
  19 /*
  20  * Duration of time (in seconds) after which pending list subscribe/unsubscribe
  21  * requests that have not been confirmed will be deleted.
  22  */
  23 #define EXP     259200  /* three days */
  24
  25 #include "sysdep.h"
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <stdio.h>
  29 #include <fcntl.h>
  30 #include <ctype.h>
  31 #include <signal.h>
  32 #include <pwd.h>
  33 #include <errno.h>
  34 #include <sys/stat.h>
  35 #include <sys/types.h>
  36 #include <dirent.h>
  37 #if TIME_WITH_SYS_TIME
  38 # include <sys/time.h>
  39 # include <time.h>
  40 #else
  41 # if HAVE_SYS_TIME_H
  42 #  include <sys/time.h>
  43 # else
  44 #  include <time.h>
  45 # endif
  46 #endif
  47
  48 #include <sys/wait.h>
  49 #include <string.h>
  50 #include <limits.h>
  51 #include "citadel.h"
  52 #include "server.h"
  53 #include "sysdep_decls.h"
  54 #include "citserver.h"
  55 #include "support.h"
  56 #include "config.h"
  57 #include "serv_extensions.h"
  58 #include "room_ops.h"
  59 #include "user_ops.h"
  60 #include "policy.h"
  61 #include "database.h"
  62 #include "msgbase.h"
  63 #include "tools.h"
  64 #include "internet_addressing.h"
  65 #include "serv_network.h"
  66 #include "clientsocket.h"
  67 #include "file_ops.h"
  68 #include "citadel_dirs.h"
  69
  70 #ifndef HAVE_SNPRINTF
  71 #include "snprintf.h"
  72 #endif
  73
  74 /* Nonzero while we are doing network processing */
  75 static int doing_queue = 0;
  76
  77 /*
  78  * When we do network processing, it's accomplished in two passes; one to
  79  * gather a list of rooms and one to actually do them.  It's ok that rplist
  80  * is global; we have a mutex that keeps it safe.
  81  */
  82 struct RoomProcList *rplist = NULL;
  83
  84 /*
  85  * We build a map of network nodes during processing.
  86  */
  87 struct NetMap *the_netmap = NULL;
  88 int netmap_changed = 0;
  89 char *working_ignetcfg = NULL;
  90
  91 /*
  92  * Load or refresh the Citadel network (IGnet) configuration for this node.
  93  */
  94 void load_working_ignetcfg(void) {
  95         char *cfg;
  96         char *oldcfg;
  97
  98         cfg = CtdlGetSysConfig(IGNETCFG);
  99         if (cfg == NULL) {
 100                 cfg = strdup("");
 101         }
 102
 103         oldcfg = working_ignetcfg;
 104         working_ignetcfg = cfg;
 105         if (oldcfg != NULL) {
 106                 free(oldcfg);
 107         }
 108 }
 109
 110
 111
 112
 113
 114 /*
 115  * Keep track of what messages to reject
 116  */
 117 struct FilterList *load_filter_list(void) {
 118         char *serialized_list = NULL;
 119         int i;
 120         char buf[SIZ];
 121         struct FilterList *newlist = NULL;
 122         struct FilterList *nptr;
 123
 124         serialized_list = CtdlGetSysConfig(FILTERLIST);
 125         if (serialized_list == NULL) return(NULL); /* if null, no entries */
 126
 127         /* Use the string tokenizer to grab one line at a time */
 128         for (i=0; i<num_tokens(serialized_list, '\n'); ++i) {
 129                 extract_token(buf, serialized_list, i, '\n', sizeof buf);
 130                 nptr = (struct FilterList *) malloc(sizeof(struct FilterList));
 131                 extract_token(nptr->fl_user, buf, 0, '|', sizeof nptr->fl_user);
 132                 striplt(nptr->fl_user);
 133                 extract_token(nptr->fl_room, buf, 1, '|', sizeof nptr->fl_room);
 134                 striplt(nptr->fl_room);
 135                 extract_token(nptr->fl_node, buf, 2, '|', sizeof nptr->fl_node);
 136                 striplt(nptr->fl_node);
 137
 138                 /* Cowardly refuse to add an any/any/any entry that would
 139                  * end up filtering every single message.
 140                  */
 141                 if (strlen(nptr->fl_user) + strlen(nptr->fl_room)
 142                    + strlen(nptr->fl_node) == 0) {
 143                         free(nptr);
 144                 }
 145                 else {
 146                         nptr->next = newlist;
 147                         newlist = nptr;
 148                 }
 149         }
 150
 151         free(serialized_list);
 152         return newlist;
 153 }
 154
 155
 156 void free_filter_list(struct FilterList *fl) {
 157         if (fl == NULL) return;
 158         free_filter_list(fl->next);
 159         free(fl);
 160 }
 161
 162
 163
 164 /*
 165  * Check the use table.  This is a list of messages which have recently
 166  * arrived on the system.  It is maintained and queried to prevent the same
 167  * message from being entered into the database multiple times if it happens
 168  * to arrive multiple times by accident.
 169  */
 170 int network_usetable(struct CtdlMessage *msg) {
 171
 172         char msgid[SIZ];
 173         struct cdbdata *cdbut;
 174         struct UseTable ut;
 175
 176         /* Bail out if we can't generate a message ID */
 177         if (msg == NULL) {
 178                 return(0);
 179         }
 180         if (msg->cm_fields['I'] == NULL) {
 181                 return(0);
 182         }
 183         if (strlen(msg->cm_fields['I']) == 0) {
 184                 return(0);
 185         }
 186
 187         /* Generate the message ID */
 188         strcpy(msgid, msg->cm_fields['I']);
 189         if (haschar(msgid, '@') == 0) {
 190                 strcat(msgid, "@");
 191                 if (msg->cm_fields['N'] != NULL) {
 192                         strcat(msgid, msg->cm_fields['N']);
 193                 }
 194                 else {
 195                         return(0);
 196                 }
 197         }
 198
 199         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 200         if (cdbut != NULL) {
 201                 cdb_free(cdbut);
 202                 return(1);
 203         }
 204
 205         /* If we got to this point, it's unique: add it. */
 206         strcpy(ut.ut_msgid, msgid);
 207         ut.ut_timestamp = time(NULL);
 208         cdb_store(CDB_USETABLE, msgid, strlen(msgid),
 209                 &ut, sizeof(struct UseTable) );
 210         return(0);
 211 }
 212
 213
 214 /*
 215  * Read the network map from its configuration file into memory.
 216  */
 217 void read_network_map(void) {
 218         char *serialized_map = NULL;
 219         int i;
 220         char buf[SIZ];
 221         struct NetMap *nmptr;
 222
 223         serialized_map = CtdlGetSysConfig(IGNETMAP);
 224         if (serialized_map == NULL) return;     /* if null, no entries */
 225
 226         /* Use the string tokenizer to grab one line at a time */
 227         for (i=0; i<num_tokens(serialized_map, '\n'); ++i) {
 228                 extract_token(buf, serialized_map, i, '\n', sizeof buf);
 229                 nmptr = (struct NetMap *) malloc(sizeof(struct NetMap));
 230                 extract_token(nmptr->nodename, buf, 0, '|', sizeof nmptr->nodename);
 231                 nmptr->lastcontact = extract_long(buf, 1);
 232                 extract_token(nmptr->nexthop, buf, 2, '|', sizeof nmptr->nexthop);
 233                 nmptr->next = the_netmap;
 234                 the_netmap = nmptr;
 235         }
 236
 237         free(serialized_map);
 238         netmap_changed = 0;
 239 }
 240
 241
 242 /*
 243  * Write the network map from memory back to the configuration file.
 244  */
 245 void write_network_map(void) {
 246         char *serialized_map = NULL;
 247         struct NetMap *nmptr;
 248
 249
 250         if (netmap_changed) {
 251                 serialized_map = strdup("");
 252
 253                 if (the_netmap != NULL) {
 254                         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 255                                 serialized_map = realloc(serialized_map,
 256                                                         (strlen(serialized_map)+SIZ) );
 257                                 if (strlen(nmptr->nodename) > 0) {
 258                                         snprintf(&serialized_map[strlen(serialized_map)],
 259                                                 SIZ,
 260                                                 "%s|%ld|%s\n",
 261                                                 nmptr->nodename,
 262                                                 (long)nmptr->lastcontact,
 263                                                 nmptr->nexthop);
 264                                 }
 265                         }
 266                 }
 267
 268                 CtdlPutSysConfig(IGNETMAP, serialized_map);
 269                 free(serialized_map);
 270         }
 271
 272         /* Now free the list */
 273         while (the_netmap != NULL) {
 274                 nmptr = the_netmap->next;
 275                 free(the_netmap);
 276                 the_netmap = nmptr;
 277         }
 278         netmap_changed = 0;
 279 }
 280
 281
 282
 283 /*
 284  * Check the network map and determine whether the supplied node name is
 285  * valid.  If it is not a neighbor node, supply the name of a neighbor node
 286  * which is the next hop.  If it *is* a neighbor node, we also fill in the
 287  * shared secret.
 288  */
 289 int is_valid_node(char *nexthop, char *secret, char *node) {
 290         int i;
 291         char linebuf[SIZ];
 292         char buf[SIZ];
 293         int retval;
 294         struct NetMap *nmptr;
 295
 296         if (node == NULL) {
 297                 return(-1);
 298         }
 299
 300         /*
 301          * First try the neighbor nodes
 302          */
 303         if (working_ignetcfg == NULL) {
 304                 lprintf(CTDL_ERR, "working_ignetcfg is NULL!\n");
 305                 if (nexthop != NULL) {
 306                         strcpy(nexthop, "");
 307                 }
 308                 return(-1);
 309         }
 310
 311         retval = (-1);
 312         if (nexthop != NULL) {
 313                 strcpy(nexthop, "");
 314         }
 315
 316         /* Use the string tokenizer to grab one line at a time */
 317         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
 318                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
 319                 extract_token(buf, linebuf, 0, '|', sizeof buf);
 320                 if (!strcasecmp(buf, node)) {
 321                         if (nexthop != NULL) {
 322                                 strcpy(nexthop, "");
 323                         }
 324                         if (secret != NULL) {
 325                                 extract_token(secret, linebuf, 1, '|', 256);
 326                         }
 327                         retval = 0;
 328                 }
 329         }
 330
 331         if (retval == 0) {
 332                 return(retval);         /* yup, it's a direct neighbor */
 333         }
 334
 335         /*
 336          * If we get to this point we have to see if we know the next hop
 337          */
 338         if (the_netmap != NULL) {
 339                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 340                         if (!strcasecmp(nmptr->nodename, node)) {
 341                                 if (nexthop != NULL) {
 342                                         strcpy(nexthop, nmptr->nexthop);
 343                                 }
 344                                 return(0);
 345                         }
 346                 }
 347         }
 348
 349         /*
 350          * If we get to this point, the supplied node name is bogus.
 351          */
 352         lprintf(CTDL_ERR, "Invalid node name <%s>\n", node);
 353         return(-1);
 354 }
 355
 356
 357
 358
 359
 360 void cmd_gnet(char *argbuf) {
 361         char filename[SIZ];
 362         char buf[SIZ];
 363         FILE *fp;
 364
 365         if (CtdlAccessCheck(ac_room_aide)) return;
 366         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 367         cprintf("%d Network settings for room #%ld <%s>\n",
 368                 LISTING_FOLLOWS,
 369                 CC->room.QRnumber, CC->room.QRname);
 370
 371         fp = fopen(filename, "r");
 372         if (fp != NULL) {
 373                 while (fgets(buf, sizeof buf, fp) != NULL) {
 374                         buf[strlen(buf)-1] = 0;
 375                         cprintf("%s\n", buf);
 376                 }
 377                 fclose(fp);
 378         }
 379
 380         cprintf("000\n");
 381 }
 382
 383
 384 void cmd_snet(char *argbuf) {
 385         char tempfilename[SIZ];
 386         char filename[SIZ];
 387         char buf[SIZ];
 388         FILE *fp;
 389
 390         unbuffer_output();
 391
 392         if (CtdlAccessCheck(ac_room_aide)) return;
 393         CtdlMakeTempFileName(tempfilename, sizeof tempfilename);
 394         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 395
 396         fp = fopen(tempfilename, "w");
 397         if (fp == NULL) {
 398                 cprintf("%d Cannot open %s: %s\n",
 399                         ERROR + INTERNAL_ERROR,
 400                         tempfilename,
 401                         strerror(errno));
 402         }
 403
 404         cprintf("%d %s\n", SEND_LISTING, tempfilename);
 405         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 406                 fprintf(fp, "%s\n", buf);
 407         }
 408         fclose(fp);
 409
 410         /* Now copy the temp file to its permanent location
 411          * (We use /bin/mv instead of link() because they may be on
 412          * different filesystems)
 413          */
 414         unlink(filename);
 415         snprintf(buf, sizeof buf, "/bin/mv %s %s", tempfilename, filename);
 416         begin_critical_section(S_NETCONFIGS);
 417         system(buf);
 418         end_critical_section(S_NETCONFIGS);
 419 }
 420
 421
 422 /*
 423  * Deliver digest messages
 424  */
 425 void network_deliver_digest(struct SpoolControl *sc) {
 426         char buf[SIZ];
 427         int i;
 428         struct CtdlMessage *msg = NULL;
 429         long msglen;
 430         char *recps = NULL;
 431         size_t recps_len = SIZ;
 432         struct recptypes *valid;
 433         struct namelist *nptr;
 434
 435         if (sc->num_msgs_spooled < 1) {
 436                 fclose(sc->digestfp);
 437                 sc->digestfp = NULL;
 438                 return;
 439         }
 440
 441         msg = malloc(sizeof(struct CtdlMessage));
 442         memset(msg, 0, sizeof(struct CtdlMessage));
 443         msg->cm_magic = CTDLMESSAGE_MAGIC;
 444         msg->cm_format_type = FMT_RFC822;
 445         msg->cm_anon_type = MES_NORMAL;
 446
 447         sprintf(buf, "%ld", time(NULL));
 448         msg->cm_fields['T'] = strdup(buf);
 449         msg->cm_fields['A'] = strdup(CC->room.QRname);
 450         snprintf(buf, sizeof buf, "[%s]", CC->room.QRname);
 451         msg->cm_fields['U'] = strdup(buf);
 452         sprintf(buf, "room_%s@%s", CC->room.QRname, config.c_fqdn);
 453         for (i=0; i<strlen(buf); ++i) {
 454                 if (isspace(buf[i])) buf[i]='_';
 455                 buf[i] = tolower(buf[i]);
 456         }
 457         msg->cm_fields['F'] = strdup(buf);
 458         msg->cm_fields['R'] = strdup(buf);
 459
 460         /*
 461          * Go fetch the contents of the digest
 462          */
 463         fseek(sc->digestfp, 0L, SEEK_END);
 464         msglen = ftell(sc->digestfp);
 465
 466         msg->cm_fields['M'] = malloc(msglen + 1);
 467         fseek(sc->digestfp, 0L, SEEK_SET);
 468         fread(msg->cm_fields['M'], (size_t)msglen, 1, sc->digestfp);
 469         msg->cm_fields['M'][msglen] = 0;
 470
 471         fclose(sc->digestfp);
 472         sc->digestfp = NULL;
 473
 474         /* Now generate the delivery instructions */
 475
 476         /*
 477          * Figure out how big a buffer we need to allocate
 478          */
 479         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 480                 recps_len = recps_len + strlen(nptr->name) + 2;
 481         }
 482
 483         recps = malloc(recps_len);
 484
 485         if (recps == NULL) {
 486                 lprintf(CTDL_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 487                 abort();
 488         }
 489
 490         strcpy(recps, "");
 491
 492         /* Each recipient */
 493         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 494                 if (nptr != sc->digestrecps) {
 495                         strcat(recps, ",");
 496                 }
 497                 strcat(recps, nptr->name);
 498         }
 499
 500         /* Now submit the message */
 501         valid = validate_recipients(recps);
 502         free(recps);
 503         CtdlSubmitMsg(msg, valid, NULL);
 504         CtdlFreeMessage(msg);
 505         free_recipients(valid);
 506 }
 507
 508
 509 /*
 510  * Deliver list messages to everyone on the list ... efficiently
 511  */
 512 void network_deliver_list(struct CtdlMessage *msg, struct SpoolControl *sc) {
 513         char *recps = NULL;
 514         size_t recps_len = SIZ;
 515         struct recptypes *valid;
 516         struct namelist *nptr;
 517
 518         /* Don't do this if there were no recipients! */
 519         if (sc->listrecps == NULL) return;
 520
 521         /* Now generate the delivery instructions */
 522
 523         /*
 524          * Figure out how big a buffer we need to allocate
 525          */
 526         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 527                 recps_len = recps_len + strlen(nptr->name) + 2;
 528         }
 529
 530         recps = malloc(recps_len);
 531
 532         if (recps == NULL) {
 533                 lprintf(CTDL_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 534                 abort();
 535         }
 536
 537         strcpy(recps, "");
 538
 539         /* Each recipient */
 540         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 541                 if (nptr != sc->listrecps) {
 542                         strcat(recps, ",");
 543                 }
 544                 strcat(recps, nptr->name);
 545         }
 546
 547         /* Now submit the message */
 548         valid = validate_recipients(recps);
 549         free(recps);
 550         CtdlSubmitMsg(msg, valid, NULL);
 551         free_recipients(valid);
 552         /* Do not call CtdlFreeMessage(msg) here; the caller will free it. */
 553 }
 554
 555
 556
 557
 558 /*
 559  * Spools out one message from the list.
 560  */
 561 void network_spool_msg(long msgnum, void *userdata) {
 562         struct SpoolControl *sc;
 563         int i;
 564         char *newpath = NULL;
 565         size_t instr_len = SIZ;
 566         struct CtdlMessage *msg = NULL;
 567         struct namelist *nptr;
 568         struct maplist *mptr;
 569         struct ser_ret sermsg;
 570         FILE *fp;
 571         char filename[SIZ];
 572         char buf[SIZ];
 573         int bang = 0;
 574         int send = 1;
 575         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 576         int ok_to_participate = 0;
 577         struct recptypes *valid;
 578
 579         sc = (struct SpoolControl *)userdata;
 580
 581         /*
 582          * Process mailing list recipients
 583          */
 584         instr_len = SIZ;
 585         if (sc->listrecps != NULL) {
 586                 /* Fetch the message.  We're going to need to modify it
 587                  * in order to insert the [list name] in it, etc.
 588                  */
 589                 msg = CtdlFetchMessage(msgnum, 1);
 590                 if (msg != NULL) {
 591
 592                         /* Prepend "[List name]" to the subject */
 593                         if (msg->cm_fields['U'] == NULL) {
 594                                 msg->cm_fields['U'] = strdup("(no subject)");
 595                         }
 596                         snprintf(buf, sizeof buf, "[%s] %s", CC->room.QRname, msg->cm_fields['U']);
 597                         free(msg->cm_fields['U']);
 598                         msg->cm_fields['U'] = strdup(buf);
 599
 600                         /* Set the recipient of the list message to the
 601                          * email address of the room itself.
 602                          * FIXME ... I want to be able to pick any address
 603                          */
 604                         if (msg->cm_fields['R'] != NULL) {
 605                                 free(msg->cm_fields['R']);
 606                         }
 607                         msg->cm_fields['R'] = malloc(256);
 608                         snprintf(msg->cm_fields['R'], 256,
 609                                 "room_%s@%s", CC->room.QRname,
 610                                 config.c_fqdn);
 611                         for (i=0; i<strlen(msg->cm_fields['R']); ++i) {
 612                                 if (isspace(msg->cm_fields['R'][i])) {
 613                                         msg->cm_fields['R'][i] = '_';
 614                                 }
 615                         }
 616
 617                         /* Handle delivery */
 618                         network_deliver_list(msg, sc);
 619                         CtdlFreeMessage(msg);
 620                 }
 621         }
 622
 623         /*
 624          * Process digest recipients
 625          */
 626         if ((sc->digestrecps != NULL) && (sc->digestfp != NULL)) {
 627                 msg = CtdlFetchMessage(msgnum, 1);
 628                 if (msg != NULL) {
 629                         fprintf(sc->digestfp,   " -----------------------------------"
 630                                                 "------------------------------------"
 631                                                 "-------\n");
 632                         fprintf(sc->digestfp, "From: ");
 633                         if (msg->cm_fields['A'] != NULL) {
 634                                 fprintf(sc->digestfp, "%s ", msg->cm_fields['A']);
 635                         }
 636                         if (msg->cm_fields['F'] != NULL) {
 637                                 fprintf(sc->digestfp, "<%s> ", msg->cm_fields['F']);
 638                         }
 639                         else if (msg->cm_fields['N'] != NULL) {
 640                                 fprintf(sc->digestfp, "@%s ", msg->cm_fields['N']);
 641                         }
 642                         fprintf(sc->digestfp, "\n");
 643                         if (msg->cm_fields['U'] != NULL) {
 644                                 fprintf(sc->digestfp, "Subject: %s\n", msg->cm_fields['U']);
 645                         }
 646
 647                         CC->redirect_buffer = malloc(SIZ);
 648                         CC->redirect_len = 0;
 649                         CC->redirect_alloc = SIZ;
 650
 651                         safestrncpy(CC->preferred_formats, "text/plain", sizeof CC->preferred_formats);
 652                         CtdlOutputPreLoadedMsg(msg, MT_CITADEL, HEADERS_NONE, 0, 0);
 653
 654                         striplt(CC->redirect_buffer);
 655                         fprintf(sc->digestfp, "\n%s\n", CC->redirect_buffer);
 656
 657                         free(CC->redirect_buffer);
 658                         CC->redirect_buffer = NULL;
 659                         CC->redirect_len = 0;
 660                         CC->redirect_alloc = 0;
 661
 662                         sc->num_msgs_spooled += 1;
 663                         free(msg);
 664                 }
 665         }
 666
 667         /*
 668          * Process client-side list participations for this room
 669          */
 670         instr_len = SIZ;
 671         if (sc->participates != NULL) {
 672                 msg = CtdlFetchMessage(msgnum, 1);
 673                 if (msg != NULL) {
 674
 675                         /* Only send messages which originated on our own Citadel
 676                          * network, otherwise we'll end up sending the remote
 677                          * mailing list's messages back to it, which is rude...
 678                          */
 679                         ok_to_participate = 0;
 680                         if (msg->cm_fields['N'] != NULL) {
 681                                 if (!strcasecmp(msg->cm_fields['N'], config.c_nodename)) {
 682                                         ok_to_participate = 1;
 683                                 }
 684                                 if (is_valid_node(NULL, NULL, msg->cm_fields['N']) == 0) {
 685                                         ok_to_participate = 1;
 686                                 }
 687                         }
 688                         if (ok_to_participate) {
 689                                 if (msg->cm_fields['F'] != NULL) {
 690                                         free(msg->cm_fields['F']);
 691                                 }
 692                                 msg->cm_fields['F'] = malloc(SIZ);
 693                                 /* Replace the Internet email address of the actual
 694                                 * author with the email address of the room itself,
 695                                 * so the remote listserv doesn't reject us.
 696                                 * FIXME ... I want to be able to pick any address
 697                                 */
 698                                 snprintf(msg->cm_fields['F'], SIZ,
 699                                         "room_%s@%s", CC->room.QRname,
 700                                         config.c_fqdn);
 701                                 for (i=0; i<strlen(msg->cm_fields['F']); ++i) {
 702                                         if (isspace(msg->cm_fields['F'][i])) {
 703                                                 msg->cm_fields['F'][i] = '_';
 704                                         }
 705                                 }
 706
 707                                 /*
 708                                  * Figure out how big a buffer we need to allocate
 709                                  */
 710                                 for (nptr = sc->participates; nptr != NULL; nptr = nptr->next) {
 711
 712                                         if (msg->cm_fields['R'] == NULL) {
 713                                                 free(msg->cm_fields['R']);
 714                                         }
 715                                         msg->cm_fields['R'] = strdup(nptr->name);
 716
 717                                         valid = validate_recipients(nptr->name);
 718                                         CtdlSubmitMsg(msg, valid, "");
 719                                         free_recipients(valid);
 720                                 }
 721
 722                         }
 723                         CtdlFreeMessage(msg);
 724                 }
 725         }
 726
 727         /*
 728          * Process IGnet push shares
 729          */
 730         msg = CtdlFetchMessage(msgnum, 1);
 731         if (msg != NULL) {
 732                 size_t newpath_len;
 733
 734                 /* Prepend our node name to the Path field whenever
 735                  * sending a message to another IGnet node
 736                  */
 737                 if (msg->cm_fields['P'] == NULL) {
 738                         msg->cm_fields['P'] = strdup("username");
 739                 }
 740                 newpath_len = strlen(msg->cm_fields['P']) +
 741                          strlen(config.c_nodename) + 2;
 742                 newpath = malloc(newpath_len);
 743                 snprintf(newpath, newpath_len, "%s!%s",
 744                          config.c_nodename, msg->cm_fields['P']);
 745                 free(msg->cm_fields['P']);
 746                 msg->cm_fields['P'] = newpath;
 747
 748                 /*
 749                  * Determine if this message is set to be deleted
 750                  * after sending out on the network
 751                  */
 752                 if (msg->cm_fields['S'] != NULL) {
 753                         if (!strcasecmp(msg->cm_fields['S'], "CANCEL")) {
 754                                 delete_after_send = 1;
 755                         }
 756                 }
 757
 758                 /* Now send it to every node */
 759                 if (sc->ignet_push_shares != NULL)
 760                   for (mptr = sc->ignet_push_shares; mptr != NULL;
 761                     mptr = mptr->next) {
 762
 763                         send = 1;
 764
 765                         /* Check for valid node name */
 766                         if (is_valid_node(NULL, NULL, mptr->remote_nodename) != 0) {
 767                                 lprintf(CTDL_ERR, "Invalid node <%s>\n",
 768                                         mptr->remote_nodename);
 769                                 send = 0;
 770                         }
 771
 772                         /* Check for split horizon */
 773                         lprintf(CTDL_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 774                         bang = num_tokens(msg->cm_fields['P'], '!');
 775                         if (bang > 1) for (i=0; i<(bang-1); ++i) {
 776                                 extract_token(buf, msg->cm_fields['P'],
 777                                         i, '!', sizeof buf);
 778                                 if (!strcasecmp(buf, mptr->remote_nodename)) {
 779                                         send = 0;
 780                                 }
 781                         }
 782
 783                         /* Send the message */
 784                         if (send == 1) {
 785
 786                                 /*
 787                                  * Force the message to appear in the correct room
 788                                  * on the far end by setting the C field correctly
 789                                  */
 790                                 if (msg->cm_fields['C'] != NULL) {
 791                                         free(msg->cm_fields['C']);
 792                                 }
 793                                 if (strlen(mptr->remote_roomname) > 0) {
 794                                         msg->cm_fields['C'] = strdup(mptr->remote_roomname);
 795                                 }
 796                                 else {
 797                                         msg->cm_fields['C'] = strdup(CC->room.QRname);
 798                                 }
 799
 800                                 /* serialize it for transmission */
 801                                 serialize_message(&sermsg, msg);
 802                                 if (sermsg.len > 0) {
 803
 804                                         /* write it to the spool file */
 805                                         snprintf(filename, sizeof filename,"%s/%s",
 806                                                         ctdl_netout_dir,
 807                                                         mptr->remote_nodename);
 808                                         lprintf(CTDL_DEBUG, "Appending to %s\n", filename);
 809                                         fp = fopen(filename, "ab");
 810                                         if (fp != NULL) {
 811                                                 fwrite(sermsg.ser,
 812                                                         sermsg.len, 1, fp);
 813                                                 fclose(fp);
 814                                         }
 815                                         else {
 816                                                 lprintf(CTDL_ERR, "%s: %s\n", filename, strerror(errno));
 817                                         }
 818
 819                                         /* free the serialized version */
 820                                         free(sermsg.ser);
 821                                 }
 822
 823                         }
 824                 }
 825                 CtdlFreeMessage(msg);
 826         }
 827
 828         /* update lastsent */
 829         sc->lastsent = msgnum;
 830
 831         /* Delete this message if delete-after-send is set */
 832         if (delete_after_send) {
 833                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 834         }
 835
 836 }
 837
 838
 839 /*
 840  * Batch up and send all outbound traffic from the current room
 841  */
 842 void network_spoolout_room(char *room_to_spool) {
 843         char filename[SIZ];
 844         char buf[SIZ];
 845         char instr[SIZ];
 846         char nodename[256];
 847         char roomname[ROOMNAMELEN];
 848         char nexthop[256];
 849         FILE *fp;
 850         struct SpoolControl sc;
 851         struct namelist *nptr = NULL;
 852         struct maplist *mptr = NULL;
 853         size_t miscsize = 0;
 854         size_t linesize = 0;
 855         int skipthisline = 0;
 856         int i;
 857
 858         /*
 859          * If the room doesn't exist, don't try to perform its networking tasks.
 860          * Normally this should never happen, but once in a while maybe a room gets
 861          * queued for networking and then deleted before it can happen.
 862          */
 863         if (getroom(&CC->room, room_to_spool) != 0) {
 864                 lprintf(CTDL_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
 865                 return;
 866         }
 867
 868         memset(&sc, 0, sizeof(struct SpoolControl));
 869         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 870
 871         begin_critical_section(S_NETCONFIGS);
 872
 873         /* Only do net processing for rooms that have netconfigs */
 874         fp = fopen(filename, "r");
 875         if (fp == NULL) {
 876                 end_critical_section(S_NETCONFIGS);
 877                 return;
 878         }
 879
 880         lprintf(CTDL_INFO, "Networking started for <%s>\n", CC->room.QRname);
 881
 882         while (fgets(buf, sizeof buf, fp) != NULL) {
 883                 buf[strlen(buf)-1] = 0;
 884
 885                 extract_token(instr, buf, 0, '|', sizeof instr);
 886                 if (!strcasecmp(instr, "lastsent")) {
 887                         sc.lastsent = extract_long(buf, 1);
 888                 }
 889                 else if (!strcasecmp(instr, "listrecp")) {
 890                         nptr = (struct namelist *)
 891                                 malloc(sizeof(struct namelist));
 892                         nptr->next = sc.listrecps;
 893                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 894                         sc.listrecps = nptr;
 895                 }
 896                 else if (!strcasecmp(instr, "participate")) {
 897                         nptr = (struct namelist *)
 898                                 malloc(sizeof(struct namelist));
 899                         nptr->next = sc.participates;
 900                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 901                         sc.participates = nptr;
 902                 }
 903                 else if (!strcasecmp(instr, "digestrecp")) {
 904                         nptr = (struct namelist *)
 905                                 malloc(sizeof(struct namelist));
 906                         nptr->next = sc.digestrecps;
 907                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 908                         sc.digestrecps = nptr;
 909                 }
 910                 else if (!strcasecmp(instr, "ignet_push_share")) {
 911                         /* by checking each node's validity, we automatically
 912                          * purge nodes which do not exist from room network
 913                          * configurations at this time.
 914                          */
 915                         extract_token(nodename, buf, 1, '|', sizeof nodename);
 916                         extract_token(roomname, buf, 2, '|', sizeof roomname);
 917                         strcpy(nexthop, "xxx");
 918                         if (is_valid_node(nexthop, NULL, nodename) == 0) {
 919                                 if (strlen(nexthop) == 0) {
 920                                         mptr = (struct maplist *)
 921                                                 malloc(sizeof(struct maplist));
 922                                         mptr->next = sc.ignet_push_shares;
 923                                         strcpy(mptr->remote_nodename, nodename);
 924                                         strcpy(mptr->remote_roomname, roomname);
 925                                         sc.ignet_push_shares = mptr;
 926                                 }
 927                         }
 928                 }
 929                 else {
 930                         /* Preserve 'other' lines ... *unless* they happen to
 931                          * be subscribe/unsubscribe pendings with expired
 932                          * timestamps.
 933                          */
 934                         skipthisline = 0;
 935                         if (!strncasecmp(buf, "subpending|", 11)) {
 936                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
 937                                         skipthisline = 1;
 938                                 }
 939                         }
 940                         if (!strncasecmp(buf, "unsubpending|", 13)) {
 941                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
 942                                         skipthisline = 1;
 943                                 }
 944                         }
 945
 946                         if (skipthisline == 0) {
 947                                 linesize = strlen(buf);
 948                                 sc.misc = realloc(sc.misc,
 949                                         (miscsize + linesize + 2) );
 950                                 sprintf(&sc.misc[miscsize], "%s\n", buf);
 951                                 miscsize = miscsize + linesize + 1;
 952                         }
 953                 }
 954
 955
 956         }
 957         fclose(fp);
 958
 959         /* If there are digest recipients, we have to build a digest */
 960         if (sc.digestrecps != NULL) {
 961                 sc.digestfp = tmpfile();
 962                 fprintf(sc.digestfp, "Content-type: text/plain\n\n");
 963         }
 964
 965         /* Do something useful */
 966         CtdlForEachMessage(MSGS_GT, sc.lastsent, NULL, NULL, NULL,
 967                 network_spool_msg, &sc);
 968
 969         /* If we wrote a digest, deliver it and then close it */
 970         snprintf(buf, sizeof buf, "room_%s@%s",
 971                 CC->room.QRname, config.c_fqdn);
 972         for (i=0; i<strlen(buf); ++i) {
 973                 buf[i] = tolower(buf[i]);
 974                 if (isspace(buf[i])) buf[i] = '_';
 975         }
 976         if (sc.digestfp != NULL) {
 977                 fprintf(sc.digestfp,    " -----------------------------------"
 978                                         "------------------------------------"
 979                                         "-------\n"
 980                                         "You are subscribed to the '%s' "
 981                                         "list.\n"
 982                                         "To post to the list: %s\n",
 983                                         CC->room.QRname, buf
 984                 );
 985                 network_deliver_digest(&sc);    /* deliver and close */
 986         }
 987
 988         /* Now rewrite the config file */
 989         fp = fopen(filename, "w");
 990         if (fp == NULL) {
 991                 lprintf(CTDL_CRIT, "ERROR: cannot open %s: %s\n",
 992                         filename, strerror(errno));
 993         }
 994         else {
 995                 fprintf(fp, "lastsent|%ld\n", sc.lastsent);
 996
 997                 /* Write out the listrecps while freeing from memory at the
 998                  * same time.  Am I clever or what?  :)
 999                  */
1000                 while (sc.listrecps != NULL) {
1001                         fprintf(fp, "listrecp|%s\n", sc.listrecps->name);
1002                         nptr = sc.listrecps->next;
1003                         free(sc.listrecps);
1004                         sc.listrecps = nptr;
1005                 }
1006                 /* Do the same for digestrecps */
1007                 while (sc.digestrecps != NULL) {
1008                         fprintf(fp, "digestrecp|%s\n", sc.digestrecps->name);
1009                         nptr = sc.digestrecps->next;
1010                         free(sc.digestrecps);
1011                         sc.digestrecps = nptr;
1012                 }
1013                 /* Do the same for participates */
1014                 while (sc.participates != NULL) {
1015                         fprintf(fp, "participate|%s\n", sc.participates->name);
1016                         nptr = sc.participates->next;
1017                         free(sc.participates);
1018                         sc.participates = nptr;
1019                 }
1020                 while (sc.ignet_push_shares != NULL) {
1021                         /* by checking each node's validity, we automatically
1022                          * purge nodes which do not exist from room network
1023                          * configurations at this time.
1024                          */
1025                         if (is_valid_node(NULL, NULL, sc.ignet_push_shares->remote_nodename) == 0) {
1026                         }
1027                         fprintf(fp, "ignet_push_share|%s",
1028                                 sc.ignet_push_shares->remote_nodename);
1029                         if (strlen(sc.ignet_push_shares->remote_roomname) > 0) {
1030                                 fprintf(fp, "|%s", sc.ignet_push_shares->remote_roomname);
1031                         }
1032                         fprintf(fp, "\n");
1033                         mptr = sc.ignet_push_shares->next;
1034                         free(sc.ignet_push_shares);
1035                         sc.ignet_push_shares = mptr;
1036                 }
1037                 if (sc.misc != NULL) {
1038                         fwrite(sc.misc, strlen(sc.misc), 1, fp);
1039                 }
1040                 free(sc.misc);
1041
1042                 fclose(fp);
1043         }
1044         end_critical_section(S_NETCONFIGS);
1045 }
1046
1047
1048
1049 /*
1050  * Send the *entire* contents of the current room to one specific network node,
1051  * ignoring anything we know about which messages have already undergone
1052  * network processing.  This can be used to bring a new node into sync.
1053  */
1054 int network_sync_to(char *target_node) {
1055         struct SpoolControl sc;
1056         int num_spooled = 0;
1057         int found_node = 0;
1058         char buf[256];
1059         char sc_type[256];
1060         char sc_node[256];
1061         char sc_room[256];
1062         char filename[256];
1063         FILE *fp;
1064
1065         /* Grab the configuration line we're looking for */
1066         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1067         begin_critical_section(S_NETCONFIGS);
1068         fp = fopen(filename, "r");
1069         if (fp == NULL) {
1070                 end_critical_section(S_NETCONFIGS);
1071                 return(-1);
1072         }
1073         while (fgets(buf, sizeof buf, fp) != NULL) {
1074                 buf[strlen(buf)-1] = 0;
1075                 extract_token(sc_type, buf, 0, '|', sizeof sc_type);
1076                 extract_token(sc_node, buf, 1, '|', sizeof sc_node);
1077                 extract_token(sc_room, buf, 2, '|', sizeof sc_room);
1078                 if ( (!strcasecmp(sc_type, "ignet_push_share"))
1079                    && (!strcasecmp(sc_node, target_node)) ) {
1080                         found_node = 1;
1081
1082                         /* Concise syntax because we don't need a full linked-list */
1083                         memset(&sc, 0, sizeof(struct SpoolControl));
1084                         sc.ignet_push_shares = (struct maplist *)
1085                                 malloc(sizeof(struct maplist));
1086                         sc.ignet_push_shares->next = NULL;
1087                         safestrncpy(sc.ignet_push_shares->remote_nodename,
1088                                 sc_node,
1089                                 sizeof sc.ignet_push_shares->remote_nodename);
1090                         safestrncpy(sc.ignet_push_shares->remote_roomname,
1091                                 sc_room,
1092                                 sizeof sc.ignet_push_shares->remote_roomname);
1093                 }
1094         }
1095         fclose(fp);
1096         end_critical_section(S_NETCONFIGS);
1097
1098         if (!found_node) return(-1);
1099
1100         /* Send ALL messages */
1101         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL,
1102                 network_spool_msg, &sc);
1103
1104         /* Concise cleanup because we know there's only one node in the sc */
1105         free(sc.ignet_push_shares);
1106
1107         lprintf(CTDL_NOTICE, "Synchronized %d messages to <%s>\n",
1108                 num_spooled, target_node);
1109         return(num_spooled);
1110 }
1111
1112
1113 /*
1114  * Implements the NSYN command
1115  */
1116 void cmd_nsyn(char *argbuf) {
1117         int num_spooled;
1118         char target_node[256];
1119
1120         if (CtdlAccessCheck(ac_aide)) return;
1121
1122         extract_token(target_node, argbuf, 0, '|', sizeof target_node);
1123         num_spooled = network_sync_to(target_node);
1124         if (num_spooled >= 0) {
1125                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
1126         }
1127         else {
1128                 cprintf("%d No such room/node share exists.\n",
1129                         ERROR + ROOM_NOT_FOUND);
1130         }
1131 }
1132
1133
1134
1135 /*
1136  * Batch up and send all outbound traffic from the current room
1137  */
1138 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
1139         struct RoomProcList *ptr;
1140
1141         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
1142         if (ptr == NULL) return;
1143
1144         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
1145         begin_critical_section(S_RPLIST);
1146         ptr->next = rplist;
1147         rplist = ptr;
1148         end_critical_section(S_RPLIST);
1149 }
1150
1151 void destroy_network_queue_room(void)
1152 {
1153         struct RoomProcList *cur, *p;
1154         struct NetMap *nmcur, *nmp;
1155
1156         cur = rplist;
1157         begin_critical_section(S_RPLIST);
1158         while (cur != NULL)
1159         {
1160                 p = cur->next;
1161                 free (cur);
1162                 cur = p;
1163         }
1164         rplist = NULL;
1165         end_critical_section(S_RPLIST);
1166
1167         nmcur = the_netmap;
1168         while (nmcur != NULL)
1169         {
1170                 nmp = nmcur->next;
1171                 free (nmcur);
1172                 nmcur = nmp;
1173         }
1174         the_netmap = NULL;
1175         if (working_ignetcfg != NULL)
1176                 free (working_ignetcfg);
1177         working_ignetcfg = NULL;
1178 }
1179
1180
1181 /*
1182  * Learn topology from path fields
1183  */
1184 void network_learn_topology(char *node, char *path) {
1185         char nexthop[256];
1186         struct NetMap *nmptr;
1187
1188         strcpy(nexthop, "");
1189
1190         if (num_tokens(path, '!') < 3) return;
1191         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
1192                 if (!strcasecmp(nmptr->nodename, node)) {
1193                         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1194                         nmptr->lastcontact = time(NULL);
1195                         ++netmap_changed;
1196                         return;
1197                 }
1198         }
1199
1200         /* If we got here then it's not in the map, so add it. */
1201         nmptr = (struct NetMap *) malloc(sizeof (struct NetMap));
1202         strcpy(nmptr->nodename, node);
1203         nmptr->lastcontact = time(NULL);
1204         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1205         nmptr->next = the_netmap;
1206         the_netmap = nmptr;
1207         ++netmap_changed;
1208 }
1209
1210
1211
1212
1213 /*
1214  * Bounce a message back to the sender
1215  */
1216 void network_bounce(struct CtdlMessage *msg, char *reason) {
1217         char *oldpath = NULL;
1218         char buf[SIZ];
1219         char bouncesource[SIZ];
1220         char recipient[SIZ];
1221         struct recptypes *valid = NULL;
1222         char force_room[ROOMNAMELEN];
1223         static int serialnum = 0;
1224         size_t size;
1225
1226         lprintf(CTDL_DEBUG, "entering network_bounce()\n");
1227
1228         if (msg == NULL) return;
1229
1230         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
1231
1232         /*
1233          * Give it a fresh message ID
1234          */
1235         if (msg->cm_fields['I'] != NULL) {
1236                 free(msg->cm_fields['I']);
1237         }
1238         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
1239                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
1240         msg->cm_fields['I'] = strdup(buf);
1241
1242         /*
1243          * FIXME ... right now we're just sending a bounce; we really want to
1244          * include the text of the bounced message.
1245          */
1246         if (msg->cm_fields['M'] != NULL) {
1247                 free(msg->cm_fields['M']);
1248         }
1249         msg->cm_fields['M'] = strdup(reason);
1250         msg->cm_format_type = 0;
1251
1252         /*
1253          * Turn the message around
1254          */
1255         if (msg->cm_fields['R'] == NULL) {
1256                 free(msg->cm_fields['R']);
1257         }
1258
1259         if (msg->cm_fields['D'] == NULL) {
1260                 free(msg->cm_fields['D']);
1261         }
1262
1263         snprintf(recipient, sizeof recipient, "%s@%s",
1264                 msg->cm_fields['A'], msg->cm_fields['N']);
1265
1266         if (msg->cm_fields['A'] == NULL) {
1267                 free(msg->cm_fields['A']);
1268         }
1269
1270         if (msg->cm_fields['N'] == NULL) {
1271                 free(msg->cm_fields['N']);
1272         }
1273
1274         if (msg->cm_fields['U'] == NULL) {
1275                 free(msg->cm_fields['U']);
1276         }
1277
1278         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1279         msg->cm_fields['N'] = strdup(config.c_nodename);
1280         msg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
1281
1282         /* prepend our node to the path */
1283         if (msg->cm_fields['P'] != NULL) {
1284                 oldpath = msg->cm_fields['P'];
1285                 msg->cm_fields['P'] = NULL;
1286         }
1287         else {
1288                 oldpath = strdup("unknown_user");
1289         }
1290         size = strlen(oldpath) + SIZ;
1291         msg->cm_fields['P'] = malloc(size);
1292         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1293         free(oldpath);
1294
1295         /* Now submit the message */
1296         valid = validate_recipients(recipient);
1297         if (valid != NULL) if (valid->num_error != 0) {
1298                 free_recipients(valid);
1299                 valid = NULL;
1300         }
1301         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1302                 strcpy(force_room, config.c_aideroom);
1303         }
1304         else {
1305                 strcpy(force_room, "");
1306         }
1307         if ( (valid == NULL) && (strlen(force_room) == 0) ) {
1308                 strcpy(force_room, config.c_aideroom);
1309         }
1310         CtdlSubmitMsg(msg, valid, force_room);
1311
1312         /* Clean up */
1313         if (valid != NULL) free_recipients(valid);
1314         CtdlFreeMessage(msg);
1315         lprintf(CTDL_DEBUG, "leaving network_bounce()\n");
1316 }
1317
1318
1319
1320
1321 /*
1322  * Process a buffer containing a single message from a single file
1323  * from the inbound queue
1324  */
1325 void network_process_buffer(char *buffer, long size) {
1326         struct CtdlMessage *msg = NULL;
1327         long pos;
1328         int field;
1329         struct recptypes *recp = NULL;
1330         char target_room[ROOMNAMELEN];
1331         struct ser_ret sermsg;
1332         char *oldpath = NULL;
1333         char filename[SIZ];
1334         FILE *fp;
1335         char nexthop[SIZ];
1336         unsigned char firstbyte;
1337         unsigned char lastbyte;
1338
1339         /* Validate just a little bit.  First byte should be FF and
1340          * last byte should be 00.
1341          */
1342         memcpy(&firstbyte, &buffer[0], 1);
1343         memcpy(&lastbyte, &buffer[size-1], 1);
1344         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1345                 lprintf(CTDL_ERR, "Corrupt message!  Ignoring.\n");
1346                 return;
1347         }
1348
1349         /* Set default target room to trash */
1350         strcpy(target_room, TWITROOM);
1351
1352         /* Load the message into memory */
1353         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1354         memset(msg, 0, sizeof(struct CtdlMessage));
1355         msg->cm_magic = CTDLMESSAGE_MAGIC;
1356         msg->cm_anon_type = buffer[1];
1357         msg->cm_format_type = buffer[2];
1358
1359         for (pos = 3; pos < size; ++pos) {
1360                 field = buffer[pos];
1361                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1362                 pos = pos + strlen(&buffer[(int)pos]);
1363         }
1364
1365         /* Check for message routing */
1366         if (msg->cm_fields['D'] != NULL) {
1367                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1368
1369                         /* route the message */
1370                         strcpy(nexthop, "");
1371                         if (is_valid_node(nexthop, NULL,
1372                            msg->cm_fields['D']) == 0) {
1373
1374                                 /* prepend our node to the path */
1375                                 if (msg->cm_fields['P'] != NULL) {
1376                                         oldpath = msg->cm_fields['P'];
1377                                         msg->cm_fields['P'] = NULL;
1378                                 }
1379                                 else {
1380                                         oldpath = strdup("unknown_user");
1381                                 }
1382                                 size = strlen(oldpath) + SIZ;
1383                                 msg->cm_fields['P'] = malloc(size);
1384                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1385                                         config.c_nodename, oldpath);
1386                                 free(oldpath);
1387
1388                                 /* serialize the message */
1389                                 serialize_message(&sermsg, msg);
1390
1391                                 /* now send it */
1392                                 if (strlen(nexthop) == 0) {
1393                                         strcpy(nexthop, msg->cm_fields['D']);
1394                                 }
1395                                 snprintf(filename,
1396                                                  sizeof filename,
1397                                                  "%s/%s",
1398                                                  ctdl_netout_dir,
1399                                                  nexthop);
1400                                 lprintf(CTDL_DEBUG, "Appending to %s\n", filename);
1401                                 fp = fopen(filename, "ab");
1402                                 if (fp != NULL) {
1403                                         fwrite(sermsg.ser,
1404                                                 sermsg.len, 1, fp);
1405                                         fclose(fp);
1406                                 }
1407                                 else {
1408                                         lprintf(CTDL_ERR, "%s: %s\n", filename, strerror(errno));
1409                                 }
1410                                 free(sermsg.ser);
1411                                 CtdlFreeMessage(msg);
1412                                 return;
1413                         }
1414
1415                         else {  /* invalid destination node name */
1416
1417                                 network_bounce(msg,
1418 "A message you sent could not be delivered due to an invalid destination node"
1419 " name.  Please check the address and try sending the message again.\n");
1420                                 msg = NULL;
1421                                 return;
1422
1423                         }
1424                 }
1425         }
1426
1427         /*
1428          * Check to see if we already have a copy of this message, and
1429          * abort its processing if so.  (We used to post a warning to Aide>
1430          * every time this happened, but the network is now so densely
1431          * connected that it's inevitable.)
1432          */
1433         if (network_usetable(msg) != 0) {
1434                 return;
1435         }
1436
1437         /* Learn network topology from the path */
1438         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1439                 network_learn_topology(msg->cm_fields['N'],
1440                                         msg->cm_fields['P']);
1441         }
1442
1443         /* Is the sending node giving us a very persuasive suggestion about
1444          * which room this message should be saved in?  If so, go with that.
1445          */
1446         if (msg->cm_fields['C'] != NULL) {
1447                 safestrncpy(target_room,
1448                         msg->cm_fields['C'],
1449                         sizeof target_room);
1450         }
1451
1452         /* Otherwise, does it have a recipient?  If so, validate it... */
1453         else if (msg->cm_fields['R'] != NULL) {
1454                 recp = validate_recipients(msg->cm_fields['R']);
1455                 if (recp != NULL) if (recp->num_error != 0) {
1456                         network_bounce(msg,
1457                                 "A message you sent could not be delivered due to an invalid address.\n"
1458                                 "Please check the address and try sending the message again.\n");
1459                         msg = NULL;
1460                         free_recipients(recp);
1461                         return;
1462                 }
1463                 strcpy(target_room, "");        /* no target room if mail */
1464         }
1465
1466         /* Our last shot at finding a home for this message is to see if
1467          * it has the O field (Originating room) set.
1468          */
1469         else if (msg->cm_fields['O'] != NULL) {
1470                 safestrncpy(target_room,
1471                         msg->cm_fields['O'],
1472                         sizeof target_room);
1473         }
1474
1475         /* Strip out fields that are only relevant during transit */
1476         if (msg->cm_fields['D'] != NULL) {
1477                 free(msg->cm_fields['D']);
1478                 msg->cm_fields['D'] = NULL;
1479         }
1480         if (msg->cm_fields['C'] != NULL) {
1481                 free(msg->cm_fields['C']);
1482                 msg->cm_fields['C'] = NULL;
1483         }
1484
1485         /* save the message into a room */
1486         if (PerformNetprocHooks(msg, target_room) == 0) {
1487                 msg->cm_flags = CM_SKIP_HOOKS;
1488                 CtdlSubmitMsg(msg, recp, target_room);
1489         }
1490         CtdlFreeMessage(msg);
1491         free_recipients(recp);
1492 }
1493
1494
1495 /*
1496  * Process a single message from a single file from the inbound queue
1497  */
1498 void network_process_message(FILE *fp, long msgstart, long msgend) {
1499         long hold_pos;
1500         long size;
1501         char *buffer;
1502
1503         hold_pos = ftell(fp);
1504         size = msgend - msgstart + 1;
1505         buffer = malloc(size);
1506         if (buffer != NULL) {
1507                 fseek(fp, msgstart, SEEK_SET);
1508                 fread(buffer, size, 1, fp);
1509                 network_process_buffer(buffer, size);
1510                 free(buffer);
1511         }
1512
1513         fseek(fp, hold_pos, SEEK_SET);
1514 }
1515
1516
1517 /*
1518  * Process a single file from the inbound queue
1519  */
1520 void network_process_file(char *filename) {
1521         FILE *fp;
1522         long msgstart = (-1L);
1523         long msgend = (-1L);
1524         long msgcur = 0L;
1525         int ch;
1526
1527
1528         fp = fopen(filename, "rb");
1529         if (fp == NULL) {
1530                 lprintf(CTDL_CRIT, "Error opening %s: %s\n",
1531                         filename, strerror(errno));
1532                 return;
1533         }
1534
1535         lprintf(CTDL_INFO, "network: processing <%s>\n", filename);
1536
1537         /* Look for messages in the data stream and break them out */
1538         while (ch = getc(fp), ch >= 0) {
1539
1540                 if (ch == 255) {
1541                         if (msgstart >= 0L) {
1542                                 msgend = msgcur - 1;
1543                                 network_process_message(fp, msgstart, msgend);
1544                         }
1545                         msgstart = msgcur;
1546                 }
1547
1548                 ++msgcur;
1549         }
1550
1551         msgend = msgcur - 1;
1552         if (msgstart >= 0L) {
1553                 network_process_message(fp, msgstart, msgend);
1554         }
1555
1556         fclose(fp);
1557         unlink(filename);
1558 }
1559
1560
1561 /*
1562  * Process anything in the inbound queue
1563  */
1564 void network_do_spoolin(void) {
1565         DIR *dp;
1566         struct dirent *d;
1567         struct stat statbuf;
1568         char filename[256];
1569         static time_t last_spoolin_mtime = 0L;
1570
1571         /*
1572          * Check the spoolin directory's modification time.  If it hasn't
1573          * been touched, we don't need to scan it.
1574          */
1575         if (stat(ctdl_netin_dir, &statbuf)) return;
1576         if (statbuf.st_mtime == last_spoolin_mtime) {
1577                 lprintf(CTDL_DEBUG, "network: nothing in inbound queue\n");
1578                 return;
1579         }
1580         last_spoolin_mtime = statbuf.st_mtime;
1581         lprintf(CTDL_DEBUG, "network: processing inbound queue\n");
1582
1583         /*
1584          * Ok, there's something interesting in there, so scan it.
1585          */
1586         dp = opendir(ctdl_netin_dir);
1587         if (dp == NULL) return;
1588
1589         while (d = readdir(dp), d != NULL) {
1590                 if ((strcmp(d->d_name, ".")) && (strcmp(d->d_name, ".."))) {
1591                         snprintf(filename,
1592                                          sizeof filename,
1593                                          "%s/%s",
1594                                          ctdl_netin_dir,
1595                                          d->d_name);
1596                         network_process_file(filename);
1597                 }
1598         }
1599
1600         closedir(dp);
1601 }
1602
1603 /*
1604  * Delete any files in the outbound queue that were intended
1605  * to be sent to nodes which no longer exist.
1606  */
1607 void network_purge_spoolout(void) {
1608         DIR *dp;
1609         struct dirent *d;
1610         char filename[256];
1611         char nexthop[256];
1612         int i;
1613
1614         dp = opendir(ctdl_netout_dir);
1615         if (dp == NULL) return;
1616
1617         while (d = readdir(dp), d != NULL) {
1618                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
1619                         continue;
1620                 snprintf(filename,
1621                                  sizeof filename,
1622                                  "%s/%s",
1623                                  ctdl_netout_dir,
1624                                  d->d_name);
1625
1626                 strcpy(nexthop, "");
1627                 i = is_valid_node(nexthop, NULL, d->d_name);
1628
1629                 if ( (i != 0) || (strlen(nexthop) > 0) ) {
1630                         unlink(filename);
1631                 }
1632         }
1633
1634
1635         closedir(dp);
1636 }
1637
1638
1639 /*
1640  * receive network spool from the remote system
1641  */
1642 void receive_spool(int sock, char *remote_nodename) {
1643         long download_len;
1644         long bytes_received;
1645         char buf[SIZ];
1646         static char pbuf[IGNET_PACKET_SIZE];
1647         char tempfilename[PATH_MAX];
1648         long plen;
1649         FILE *fp;
1650
1651         CtdlMakeTempFileName(tempfilename, sizeof tempfilename);
1652         if (sock_puts(sock, "NDOP") < 0) return;
1653         if (sock_gets(sock, buf) < 0) return;
1654         lprintf(CTDL_DEBUG, "<%s\n", buf);
1655         if (buf[0] != '2') {
1656                 return;
1657         }
1658         download_len = extract_long(&buf[4], 0);
1659
1660         bytes_received = 0L;
1661         fp = fopen(tempfilename, "w");
1662         if (fp == NULL) {
1663                 lprintf(CTDL_CRIT, "cannot open download file locally: %s\n",
1664                         strerror(errno));
1665                 return;
1666         }
1667
1668         while (bytes_received < download_len) {
1669                 snprintf(buf, sizeof buf, "READ %ld|%ld",
1670                         bytes_received,
1671                      ((download_len - bytes_received > IGNET_PACKET_SIZE)
1672                  ? IGNET_PACKET_SIZE : (download_len - bytes_received)));
1673                 if (sock_puts(sock, buf) < 0) {
1674                         fclose(fp);
1675                         unlink(tempfilename);
1676                         return;
1677                 }
1678                 if (sock_gets(sock, buf) < 0) {
1679                         fclose(fp);
1680                         unlink(tempfilename);
1681                         return;
1682                 }
1683                 if (buf[0] == '6') {
1684                         plen = extract_long(&buf[4], 0);
1685                         if (sock_read(sock, pbuf, plen) < 0) {
1686                                 fclose(fp);
1687                                 unlink(tempfilename);
1688                                 return;
1689                         }
1690                         fwrite((char *) pbuf, plen, 1, fp);
1691                         bytes_received = bytes_received + plen;
1692                 }
1693         }
1694
1695         fclose(fp);
1696         if (sock_puts(sock, "CLOS") < 0) {
1697                 unlink(tempfilename);
1698                 return;
1699         }
1700         if (sock_gets(sock, buf) < 0) {
1701                 unlink(tempfilename);
1702                 return;
1703         }
1704         if (download_len > 0)
1705                 lprintf(CTDL_NOTICE, "Received %ld octets from <%s>",
1706                                 download_len, remote_nodename);
1707         lprintf(CTDL_DEBUG, "%s", buf);
1708         /* TODO: make move inline. forking is verry expensive. */
1709         snprintf(buf,
1710                          sizeof buf,
1711                          "mv %s %s/%s.%ld",
1712                          tempfilename,
1713                          ctdl_netin_dir,
1714                          remote_nodename,
1715                          (long) getpid());
1716         system(buf);
1717 }
1718
1719
1720
1721 /*
1722  * transmit network spool to the remote system
1723  */
1724 void transmit_spool(int sock, char *remote_nodename)
1725 {
1726         char buf[SIZ];
1727         char pbuf[4096];
1728         long plen;
1729         long bytes_to_write, thisblock, bytes_written;
1730         int fd;
1731         char sfname[128];
1732
1733         if (sock_puts(sock, "NUOP") < 0) return;
1734         if (sock_gets(sock, buf) < 0) return;
1735         lprintf(CTDL_DEBUG, "<%s\n", buf);
1736         if (buf[0] != '2') {
1737                 return;
1738         }
1739
1740         snprintf(sfname, sizeof sfname,
1741                          "%s/%s",
1742                          ctdl_netout_dir,
1743                          remote_nodename);
1744         fd = open(sfname, O_RDONLY);
1745         if (fd < 0) {
1746                 if (errno != ENOENT) {
1747                         lprintf(CTDL_CRIT, "cannot open upload file locally: %s\n",
1748                                 strerror(errno));
1749                 }
1750                 return;
1751         }
1752         bytes_written = 0;
1753         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
1754                 bytes_to_write = plen;
1755                 while (bytes_to_write > 0L) {
1756                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
1757                         if (sock_puts(sock, buf) < 0) {
1758                                 close(fd);
1759                                 return;
1760                         }
1761                         if (sock_gets(sock, buf) < 0) {
1762                                 close(fd);
1763                                 return;
1764                         }
1765                         thisblock = atol(&buf[4]);
1766                         if (buf[0] == '7') {
1767                                 if (sock_write(sock, pbuf,
1768                                    (int) thisblock) < 0) {
1769                                         close(fd);
1770                                         return;
1771                                 }
1772                                 bytes_to_write -= thisblock;
1773                                 bytes_written += thisblock;
1774                         } else {
1775                                 goto ABORTUPL;
1776                         }
1777                 }
1778         }
1779
1780 ABORTUPL:
1781         close(fd);
1782         if (sock_puts(sock, "UCLS 1") < 0) return;
1783         if (sock_gets(sock, buf) < 0) return;
1784         lprintf(CTDL_NOTICE, "Sent %ld octets to <%s>\n",
1785                         bytes_written, remote_nodename);
1786         lprintf(CTDL_DEBUG, "<%s\n", buf);
1787         if (buf[0] == '2') {
1788                 lprintf(CTDL_DEBUG, "Removing <%s>\n", sfname);
1789                 unlink(sfname);
1790         }
1791 }
1792
1793
1794
1795 /*
1796  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
1797  */
1798 void network_poll_node(char *node, char *secret, char *host, char *port) {
1799         int sock;
1800         char buf[SIZ];
1801
1802         if (network_talking_to(node, NTT_CHECK)) return;
1803         network_talking_to(node, NTT_ADD);
1804         lprintf(CTDL_NOTICE, "Connecting to <%s> at %s:%s\n", node, host, port);
1805
1806         sock = sock_connect(host, port, "tcp");
1807         if (sock < 0) {
1808                 lprintf(CTDL_ERR, "Could not connect: %s\n", strerror(errno));
1809                 network_talking_to(node, NTT_REMOVE);
1810                 return;
1811         }
1812
1813         lprintf(CTDL_DEBUG, "Connected!\n");
1814
1815         /* Read the server greeting */
1816         if (sock_gets(sock, buf) < 0) goto bail;
1817         lprintf(CTDL_DEBUG, ">%s\n", buf);
1818
1819         /* Identify ourselves */
1820         snprintf(buf, sizeof buf, "NETP %s|%s", config.c_nodename, secret);
1821         lprintf(CTDL_DEBUG, "<%s\n", buf);
1822         if (sock_puts(sock, buf) <0) goto bail;
1823         if (sock_gets(sock, buf) < 0) goto bail;
1824         lprintf(CTDL_DEBUG, ">%s\n", buf);
1825         if (buf[0] != '2') goto bail;
1826
1827         /* At this point we are authenticated. */
1828         receive_spool(sock, node);
1829         transmit_spool(sock, node);
1830
1831         sock_puts(sock, "QUIT");
1832 bail:   sock_close(sock);
1833         network_talking_to(node, NTT_REMOVE);
1834 }
1835
1836
1837
1838 /*
1839  * Poll other Citadel nodes and transfer inbound/outbound network data.
1840  * Set "full" to nonzero to force a poll of every node, or to zero to poll
1841  * only nodes to which we have data to send.
1842  */
1843 void network_poll_other_citadel_nodes(int full_poll) {
1844         int i;
1845         char linebuf[256];
1846         char node[SIZ];
1847         char host[256];
1848         char port[256];
1849         char secret[256];
1850         int poll = 0;
1851         char spoolfile[256];
1852
1853         if (working_ignetcfg == NULL) {
1854                 lprintf(CTDL_DEBUG, "No nodes defined - not polling\n");
1855                 return;
1856         }
1857
1858         /* Use the string tokenizer to grab one line at a time */
1859         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
1860                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
1861                 extract_token(node, linebuf, 0, '|', sizeof node);
1862                 extract_token(secret, linebuf, 1, '|', sizeof secret);
1863                 extract_token(host, linebuf, 2, '|', sizeof host);
1864                 extract_token(port, linebuf, 3, '|', sizeof port);
1865                 if ( (strlen(node) > 0) && (strlen(secret) > 0)
1866                    && (strlen(host) > 0) && strlen(port) > 0) {
1867                         poll = full_poll;
1868                         if (poll == 0) {
1869                                 snprintf(spoolfile,
1870                                                  sizeof spoolfile,
1871                                                  "%s/%s",
1872                                                  ctdl_netout_dir,
1873                                                  node);
1874                                 if (access(spoolfile, R_OK) == 0) {
1875                                         poll = 1;
1876                                 }
1877                         }
1878                         if (poll) {
1879                                 network_poll_node(node, secret, host, port);
1880                         }
1881                 }
1882         }
1883
1884 }
1885
1886
1887
1888
1889 /*
1890  * It's ok if these directories already exist.  Just fail silently.
1891  */
1892 void create_spool_dirs(void) {
1893         mkdir(ctdl_spool_dir, 0700);
1894         chown(ctdl_spool_dir, CTDLUID, (-1));
1895         mkdir(ctdl_netin_dir, 0700);
1896         chown(ctdl_netin_dir, CTDLUID, (-1));
1897         mkdir(ctdl_netout_dir, 0700);
1898         chown(ctdl_netout_dir, CTDLUID, (-1));
1899 }
1900
1901
1902
1903
1904
1905 /*
1906  * network_do_queue()
1907  *
1908  * Run through the rooms doing various types of network stuff.
1909  */
1910 void network_do_queue(void) {
1911         static time_t last_run = 0L;
1912         struct RoomProcList *ptr;
1913         int full_processing = 1;
1914
1915         /*
1916          * Run the full set of processing tasks no more frequently
1917          * than once every n seconds
1918          */
1919         if ( (time(NULL) - last_run) < config.c_net_freq ) {
1920                 full_processing = 0;
1921         }
1922
1923         /*
1924          * This is a simple concurrency check to make sure only one queue run
1925          * is done at a time.  We could do this with a mutex, but since we
1926          * don't really require extremely fine granularity here, we'll do it
1927          * with a static variable instead.
1928          */
1929         if (doing_queue) return;
1930         doing_queue = 1;
1931
1932         /* Load the IGnet Configuration into memory */
1933         load_working_ignetcfg();
1934
1935         /*
1936          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
1937          * then we poll everyone.  Otherwise we only poll nodes we have stuff
1938          * to send to.
1939          */
1940         network_poll_other_citadel_nodes(full_processing);
1941
1942         /*
1943          * Load the network map and filter list into memory.
1944          */
1945         read_network_map();
1946         filterlist = load_filter_list();
1947
1948         /*
1949          * Go ahead and run the queue
1950          */
1951         if (full_processing) {
1952                 lprintf(CTDL_DEBUG, "network: loading outbound queue\n");
1953                 ForEachRoom(network_queue_room, NULL);
1954         }
1955
1956         if (rplist != NULL) {
1957                 lprintf(CTDL_DEBUG, "network: running outbound queue\n");
1958                 while (rplist != NULL) {
1959                         char spoolroomname[ROOMNAMELEN];
1960                         safestrncpy(spoolroomname, rplist->name, sizeof spoolroomname);
1961                         begin_critical_section(S_RPLIST);
1962
1963                         /* pop this record off the list */
1964                         ptr = rplist;
1965                         rplist = rplist->next;
1966                         free(ptr);
1967
1968                         /* invalidate any duplicate entries to prevent double processing */
1969                         for (ptr=rplist; ptr!=NULL; ptr=ptr->next) {
1970                                 if (!strcasecmp(ptr->name, spoolroomname)) {
1971                                         ptr->name[0] = 0;
1972                                 }
1973                         }
1974
1975                         end_critical_section(S_RPLIST);
1976                         if (spoolroomname[0] != 0) {
1977                                 network_spoolout_room(spoolroomname);
1978                         }
1979                 }
1980         }
1981
1982         /* If there is anything in the inbound queue, process it */
1983         network_do_spoolin();
1984
1985         /* Save the network map back to disk */
1986         write_network_map();
1987
1988         /* Free the filter list in memory */
1989         free_filter_list(filterlist);
1990         filterlist = NULL;
1991
1992         network_purge_spoolout();
1993
1994         lprintf(CTDL_DEBUG, "network: queue run completed\n");
1995
1996         if (full_processing) {
1997                 last_run = time(NULL);
1998         }
1999
2000         doing_queue = 0;
2001 }
2002
2003
2004 /*
2005  * cmd_netp() - authenticate to the server as another Citadel node polling
2006  *            for network traffic
2007  */
2008 void cmd_netp(char *cmdbuf)
2009 {
2010         char node[256];
2011         char pass[256];
2012         int v;
2013
2014         char secret[256];
2015         char nexthop[256];
2016
2017         /* Authenticate */
2018         extract_token(node, cmdbuf, 0, '|', sizeof node);
2019         extract_token(pass, cmdbuf, 1, '|', sizeof pass);
2020
2021         if (doing_queue) {
2022                 lprintf(CTDL_WARNING, "Network node <%s> refused - spooling", node);
2023                 cprintf("%d spooling - try again in a few minutes\n",
2024                         ERROR + RESOURCE_BUSY);
2025                 return;
2026         }
2027
2028         /* load the IGnet Configuration to check node validity */
2029         load_working_ignetcfg();
2030         v = is_valid_node(nexthop, secret, node);
2031
2032         if (v != 0) {
2033                 lprintf(CTDL_WARNING, "Unknown node <%s>\n", node);
2034                 cprintf("%d authentication failed\n",
2035                         ERROR + PASSWORD_REQUIRED);
2036                 return;
2037         }
2038
2039         if (strcasecmp(pass, secret)) {
2040                 lprintf(CTDL_WARNING, "Bad password for network node <%s>", node);
2041                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2042                 return;
2043         }
2044
2045         if (network_talking_to(node, NTT_CHECK)) {
2046                 lprintf(CTDL_WARNING, "Duplicate session for network node <%s>", node);
2047                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
2048                 return;
2049         }
2050
2051         safestrncpy(CC->net_node, node, sizeof CC->net_node);
2052         network_talking_to(node, NTT_ADD);
2053         lprintf(CTDL_NOTICE, "Network node <%s> logged in\n", CC->net_node);
2054         cprintf("%d authenticated as network node '%s'\n", CIT_OK,
2055                 CC->net_node);
2056 }
2057
2058 int network_room_handler (struct ctdlroom *room)
2059 {
2060         network_queue_room(room, NULL);
2061         return 0;
2062 }
2063
2064 /*
2065  * Module entry point
2066  */
2067 char *serv_network_init(void)
2068 {
2069         create_spool_dirs();
2070         CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
2071         CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
2072         CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
2073         CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
2074         CtdlRegisterSessionHook(network_do_queue, EVT_TIMER);
2075         CtdlRegisterRoomHook(network_room_handler);
2076
2077         /* return our Subversion id for the Log */
2078         return "$Id$";
2079 }