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