citadel/modules/network/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 <libcitadel.h>
  52 #include "citadel.h"
  53 #include "server.h"
  54 #include "citserver.h"
  55 #include "support.h"
  56 #include "config.h"
  57 #include "room_ops.h"
  58 #include "user_ops.h"
  59 #include "policy.h"
  60 #include "database.h"
  61 #include "msgbase.h"
  62 #include "internet_addressing.h"
  63 #include "serv_network.h"
  64 #include "clientsocket.h"
  65 #include "file_ops.h"
  66 #include "citadel_dirs.h"
  67 #include "threads.h"
  68
  69 #ifndef HAVE_SNPRINTF
  70 #include "snprintf.h"
  71 #endif
  72
  73
  74 #include "ctdl_module.h"
  75
  76
  77
  78 /* Nonzero while we are doing network processing */
  79 static int doing_queue = 0;
  80
  81 /*
  82  * When we do network processing, it's accomplished in two passes; one to
  83  * gather a list of rooms and one to actually do them.  It's ok that rplist
  84  * is global; we have a mutex that keeps it safe.
  85  */
  86 struct RoomProcList *rplist = NULL;
  87
  88 /*
  89  * We build a map of network nodes during processing.
  90  */
  91 NetMap *the_netmap = NULL;
  92 int netmap_changed = 0;
  93 char *working_ignetcfg = NULL;
  94
  95 /*
  96  * Load or refresh the Citadel network (IGnet) configuration for this node.
  97  */
  98 void load_working_ignetcfg(void) {
  99         char *cfg;
 100         char *oldcfg;
 101
 102         cfg = CtdlGetSysConfig(IGNETCFG);
 103         if (cfg == NULL) {
 104                 cfg = strdup("");
 105         }
 106
 107         oldcfg = working_ignetcfg;
 108         working_ignetcfg = cfg;
 109         if (oldcfg != NULL) {
 110                 free(oldcfg);
 111         }
 112 }
 113
 114
 115
 116
 117
 118 /*
 119  * Keep track of what messages to reject
 120  */
 121 FilterList *load_filter_list(void) {
 122         char *serialized_list = NULL;
 123         int i;
 124         char buf[SIZ];
 125         FilterList *newlist = NULL;
 126         FilterList *nptr;
 127
 128         serialized_list = CtdlGetSysConfig(FILTERLIST);
 129         if (serialized_list == NULL) return(NULL); /* if null, no entries */
 130
 131         /* Use the string tokenizer to grab one line at a time */
 132         for (i=0; i<num_tokens(serialized_list, '\n'); ++i) {
 133                 extract_token(buf, serialized_list, i, '\n', sizeof buf);
 134                 nptr = (FilterList *) malloc(sizeof(FilterList));
 135                 extract_token(nptr->fl_user, buf, 0, '|', sizeof nptr->fl_user);
 136                 striplt(nptr->fl_user);
 137                 extract_token(nptr->fl_room, buf, 1, '|', sizeof nptr->fl_room);
 138                 striplt(nptr->fl_room);
 139                 extract_token(nptr->fl_node, buf, 2, '|', sizeof nptr->fl_node);
 140                 striplt(nptr->fl_node);
 141
 142                 /* Cowardly refuse to add an any/any/any entry that would
 143                  * end up filtering every single message.
 144                  */
 145                 if (IsEmptyStr(nptr->fl_user) &&
 146                     IsEmptyStr(nptr->fl_room) &&
 147                     IsEmptyStr(nptr->fl_node)) {
 148                         free(nptr);
 149                 }
 150                 else {
 151                         nptr->next = newlist;
 152                         newlist = nptr;
 153                 }
 154         }
 155
 156         free(serialized_list);
 157         return newlist;
 158 }
 159
 160
 161 void free_filter_list(FilterList *fl) {
 162         if (fl == NULL) return;
 163         free_filter_list(fl->next);
 164         free(fl);
 165 }
 166
 167
 168
 169 /*
 170  * Check the use table.  This is a list of messages which have recently
 171  * arrived on the system.  It is maintained and queried to prevent the same
 172  * message from being entered into the database multiple times if it happens
 173  * to arrive multiple times by accident.
 174  */
 175 int network_usetable(struct CtdlMessage *msg) {
 176
 177         char msgid[SIZ];
 178         struct cdbdata *cdbut;
 179         struct UseTable ut;
 180
 181         /* Bail out if we can't generate a message ID */
 182         if (msg == NULL) {
 183                 return(0);
 184         }
 185         if (msg->cm_fields['I'] == NULL) {
 186                 return(0);
 187         }
 188         if (IsEmptyStr(msg->cm_fields['I'])) {
 189                 return(0);
 190         }
 191
 192         /* Generate the message ID */
 193         strcpy(msgid, msg->cm_fields['I']);
 194         if (haschar(msgid, '@') == 0) {
 195                 strcat(msgid, "@");
 196                 if (msg->cm_fields['N'] != NULL) {
 197                         strcat(msgid, msg->cm_fields['N']);
 198                 }
 199                 else {
 200                         return(0);
 201                 }
 202         }
 203
 204         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 205         if (cdbut != NULL) {
 206                 cdb_free(cdbut);
 207                 return(1);
 208         }
 209
 210         /* If we got to this point, it's unique: add it. */
 211         strcpy(ut.ut_msgid, msgid);
 212         ut.ut_timestamp = time(NULL);
 213         cdb_store(CDB_USETABLE, msgid, strlen(msgid),
 214                 &ut, sizeof(struct UseTable) );
 215         return(0);
 216 }
 217
 218
 219 /*
 220  * Read the network map from its configuration file into memory.
 221  */
 222 void read_network_map(void) {
 223         char *serialized_map = NULL;
 224         int i;
 225         char buf[SIZ];
 226         NetMap *nmptr;
 227
 228         serialized_map = CtdlGetSysConfig(IGNETMAP);
 229         if (serialized_map == NULL) return;     /* if null, no entries */
 230
 231         /* Use the string tokenizer to grab one line at a time */
 232         for (i=0; i<num_tokens(serialized_map, '\n'); ++i) {
 233                 extract_token(buf, serialized_map, i, '\n', sizeof buf);
 234                 nmptr = (NetMap *) malloc(sizeof(NetMap));
 235                 extract_token(nmptr->nodename, buf, 0, '|', sizeof nmptr->nodename);
 236                 nmptr->lastcontact = extract_long(buf, 1);
 237                 extract_token(nmptr->nexthop, buf, 2, '|', sizeof nmptr->nexthop);
 238                 nmptr->next = the_netmap;
 239                 the_netmap = nmptr;
 240         }
 241
 242         free(serialized_map);
 243         netmap_changed = 0;
 244 }
 245
 246
 247 /*
 248  * Write the network map from memory back to the configuration file.
 249  */
 250 void write_network_map(void) {
 251         char *serialized_map = NULL;
 252         NetMap *nmptr;
 253
 254
 255         if (netmap_changed) {
 256                 serialized_map = strdup("");
 257
 258                 if (the_netmap != NULL) {
 259                         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 260                                 serialized_map = realloc(serialized_map,
 261                                                         (strlen(serialized_map)+SIZ) );
 262                                 if (!IsEmptyStr(nmptr->nodename)) {
 263                                         snprintf(&serialized_map[strlen(serialized_map)],
 264                                                 SIZ,
 265                                                 "%s|%ld|%s\n",
 266                                                 nmptr->nodename,
 267                                                 (long)nmptr->lastcontact,
 268                                                 nmptr->nexthop);
 269                                 }
 270                         }
 271                 }
 272
 273                 CtdlPutSysConfig(IGNETMAP, serialized_map);
 274                 free(serialized_map);
 275         }
 276
 277         /* Now free the list */
 278         while (the_netmap != NULL) {
 279                 nmptr = the_netmap->next;
 280                 free(the_netmap);
 281                 the_netmap = nmptr;
 282         }
 283         netmap_changed = 0;
 284 }
 285
 286
 287
 288 /*
 289  * Check the network map and determine whether the supplied node name is
 290  * valid.  If it is not a neighbor node, supply the name of a neighbor node
 291  * which is the next hop.  If it *is* a neighbor node, we also fill in the
 292  * shared secret.
 293  */
 294 int is_valid_node(char *nexthop, char *secret, char *node) {
 295         int i;
 296         char linebuf[SIZ];
 297         char buf[SIZ];
 298         int retval;
 299         NetMap *nmptr;
 300
 301         if (node == NULL) {
 302                 return(-1);
 303         }
 304
 305         /*
 306          * First try the neighbor nodes
 307          */
 308         if (working_ignetcfg == NULL) {
 309                 CtdlLogPrintf(CTDL_ERR, "working_ignetcfg is NULL!\n");
 310                 if (nexthop != NULL) {
 311                         strcpy(nexthop, "");
 312                 }
 313                 return(-1);
 314         }
 315
 316         retval = (-1);
 317         if (nexthop != NULL) {
 318                 strcpy(nexthop, "");
 319         }
 320
 321         /* Use the string tokenizer to grab one line at a time */
 322         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
 323                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
 324                 extract_token(buf, linebuf, 0, '|', sizeof buf);
 325                 if (!strcasecmp(buf, node)) {
 326                         if (nexthop != NULL) {
 327                                 strcpy(nexthop, "");
 328                         }
 329                         if (secret != NULL) {
 330                                 extract_token(secret, linebuf, 1, '|', 256);
 331                         }
 332                         retval = 0;
 333                 }
 334         }
 335
 336         if (retval == 0) {
 337                 return(retval);         /* yup, it's a direct neighbor */
 338         }
 339
 340         /*
 341          * If we get to this point we have to see if we know the next hop
 342          */
 343         if (the_netmap != NULL) {
 344                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 345                         if (!strcasecmp(nmptr->nodename, node)) {
 346                                 if (nexthop != NULL) {
 347                                         strcpy(nexthop, nmptr->nexthop);
 348                                 }
 349                                 return(0);
 350                         }
 351                 }
 352         }
 353
 354         /*
 355          * If we get to this point, the supplied node name is bogus.
 356          */
 357         CtdlLogPrintf(CTDL_ERR, "Invalid node name <%s>\n", node);
 358         return(-1);
 359 }
 360
 361
 362
 363
 364
 365 void cmd_gnet(char *argbuf) {
 366         char filename[PATH_MAX];
 367         char buf[SIZ];
 368         FILE *fp;
 369
 370         if ( (CC->room.QRflags & QR_MAILBOX) && (CC->user.usernum == atol(CC->room.QRname)) ) {
 371                 /* users can edit the netconfigs for their own mailbox rooms */
 372         }
 373         else if (CtdlAccessCheck(ac_room_aide)) return;
 374
 375         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 376         cprintf("%d Network settings for room #%ld <%s>\n",
 377                 LISTING_FOLLOWS,
 378                 CC->room.QRnumber, CC->room.QRname);
 379
 380         fp = fopen(filename, "r");
 381         if (fp != NULL) {
 382                 while (fgets(buf, sizeof buf, fp) != NULL) {
 383                         buf[strlen(buf)-1] = 0;
 384                         cprintf("%s\n", buf);
 385                 }
 386                 fclose(fp);
 387         }
 388
 389         cprintf("000\n");
 390 }
 391
 392
 393 void cmd_snet(char *argbuf) {
 394         char tempfilename[PATH_MAX];
 395         char filename[PATH_MAX];
 396         char buf[SIZ];
 397         FILE *fp, *newfp;
 398
 399         unbuffer_output();
 400
 401         if ( (CC->room.QRflags & QR_MAILBOX) && (CC->user.usernum == atol(CC->room.QRname)) ) {
 402                 /* users can edit the netconfigs for their own mailbox rooms */
 403         }
 404         else if (CtdlAccessCheck(ac_room_aide)) return;
 405
 406         CtdlMakeTempFileName(tempfilename, sizeof tempfilename);
 407         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 408
 409         fp = fopen(tempfilename, "w");
 410         if (fp == NULL) {
 411                 cprintf("%d Cannot open %s: %s\n",
 412                         ERROR + INTERNAL_ERROR,
 413                         tempfilename,
 414                         strerror(errno));
 415         }
 416
 417         cprintf("%d %s\n", SEND_LISTING, tempfilename);
 418         while (client_getln(buf, sizeof buf) >= 0 && strcmp(buf, "000")) {
 419                 fprintf(fp, "%s\n", buf);
 420         }
 421         fclose(fp);
 422
 423         /* Now copy the temp file to its permanent location.
 424          * (We copy instead of link because they may be on different filesystems)
 425          */
 426         begin_critical_section(S_NETCONFIGS);
 427         fp = fopen(tempfilename, "r");
 428         if (fp != NULL) {
 429                 newfp = fopen(filename, "w");
 430                 if (newfp != NULL) {
 431                         while (fgets(buf, sizeof buf, fp) != NULL) {
 432                                 fprintf(newfp, "%s", buf);
 433                         }
 434                         fclose(newfp);
 435                 }
 436                 fclose(fp);
 437         }
 438         end_critical_section(S_NETCONFIGS);
 439         unlink(tempfilename);
 440 }
 441
 442
 443 /*
 444  * Deliver digest messages
 445  */
 446 void network_deliver_digest(SpoolControl *sc) {
 447         char buf[SIZ];
 448         int i;
 449         struct CtdlMessage *msg = NULL;
 450         long msglen;
 451         char *recps = NULL;
 452         size_t recps_len = SIZ;
 453         struct recptypes *valid;
 454         namelist *nptr;
 455
 456         if (sc->num_msgs_spooled < 1) {
 457                 fclose(sc->digestfp);
 458                 sc->digestfp = NULL;
 459                 return;
 460         }
 461
 462         msg = malloc(sizeof(struct CtdlMessage));
 463         memset(msg, 0, sizeof(struct CtdlMessage));
 464         msg->cm_magic = CTDLMESSAGE_MAGIC;
 465         msg->cm_format_type = FMT_RFC822;
 466         msg->cm_anon_type = MES_NORMAL;
 467
 468         sprintf(buf, "%ld", time(NULL));
 469         msg->cm_fields['T'] = strdup(buf);
 470         msg->cm_fields['A'] = strdup(CC->room.QRname);
 471         snprintf(buf, sizeof buf, "[%s]", CC->room.QRname);
 472         msg->cm_fields['U'] = strdup(buf);
 473         sprintf(buf, "room_%s@%s", CC->room.QRname, config.c_fqdn);
 474         for (i=0; buf[i]; ++i) {
 475                 if (isspace(buf[i])) buf[i]='_';
 476                 buf[i] = tolower(buf[i]);
 477         }
 478         msg->cm_fields['F'] = strdup(buf);
 479         msg->cm_fields['R'] = strdup(buf);
 480
 481         /*
 482          * Go fetch the contents of the digest
 483          */
 484         fseek(sc->digestfp, 0L, SEEK_END);
 485         msglen = ftell(sc->digestfp);
 486
 487         msg->cm_fields['M'] = malloc(msglen + 1);
 488         fseek(sc->digestfp, 0L, SEEK_SET);
 489         fread(msg->cm_fields['M'], (size_t)msglen, 1, sc->digestfp);
 490         msg->cm_fields['M'][msglen] = 0;
 491
 492         fclose(sc->digestfp);
 493         sc->digestfp = NULL;
 494
 495         /* Now generate the delivery instructions */
 496
 497         /*
 498          * Figure out how big a buffer we need to allocate
 499          */
 500         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 501                 recps_len = recps_len + strlen(nptr->name) + 2;
 502         }
 503
 504         recps = malloc(recps_len);
 505
 506         if (recps == NULL) {
 507                 CtdlLogPrintf(CTDL_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 508                 abort();
 509         }
 510
 511         strcpy(recps, "");
 512
 513         /* Each recipient */
 514         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 515                 if (nptr != sc->digestrecps) {
 516                         strcat(recps, ",");
 517                 }
 518                 strcat(recps, nptr->name);
 519         }
 520
 521         /* Now submit the message */
 522         valid = validate_recipients(recps, NULL, 0);
 523         free(recps);
 524         CtdlSubmitMsg(msg, valid, NULL, 0);
 525         CtdlFreeMessage(msg);
 526         free_recipients(valid);
 527 }
 528
 529
 530 /*
 531  * Deliver list messages to everyone on the list ... efficiently
 532  */
 533 void network_deliver_list(struct CtdlMessage *msg, SpoolControl *sc) {
 534         char *recps = NULL;
 535         size_t recps_len = SIZ;
 536         struct recptypes *valid;
 537         namelist *nptr;
 538
 539         /* Don't do this if there were no recipients! */
 540         if (sc->listrecps == NULL) return;
 541
 542         /* Now generate the delivery instructions */
 543
 544         /*
 545          * Figure out how big a buffer we need to allocate
 546          */
 547         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 548                 recps_len = recps_len + strlen(nptr->name) + 2;
 549         }
 550
 551         recps = malloc(recps_len);
 552
 553         if (recps == NULL) {
 554                 CtdlLogPrintf(CTDL_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 555                 abort();
 556         }
 557
 558         strcpy(recps, "");
 559
 560         /* Each recipient */
 561         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 562                 if (nptr != sc->listrecps) {
 563                         strcat(recps, ",");
 564                 }
 565                 strcat(recps, nptr->name);
 566         }
 567
 568         /* Now submit the message */
 569         valid = validate_recipients(recps, NULL, 0);
 570         free(recps);
 571         CtdlSubmitMsg(msg, valid, NULL, 0);
 572         free_recipients(valid);
 573         /* Do not call CtdlFreeMessage(msg) here; the caller will free it. */
 574 }
 575
 576
 577
 578
 579 /*
 580  * Spools out one message from the list.
 581  */
 582 void network_spool_msg(long msgnum, void *userdata) {
 583         SpoolControl *sc;
 584         int i;
 585         char *newpath = NULL;
 586         size_t instr_len = SIZ;
 587         struct CtdlMessage *msg = NULL;
 588         namelist *nptr;
 589         maplist *mptr;
 590         struct ser_ret sermsg;
 591         FILE *fp;
 592         char filename[PATH_MAX];
 593         char buf[SIZ];
 594         int bang = 0;
 595         int send = 1;
 596         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 597         int ok_to_participate = 0;
 598         struct recptypes *valid;
 599
 600         sc = (SpoolControl *)userdata;
 601
 602         /*
 603          * Process mailing list recipients
 604          */
 605         instr_len = SIZ;
 606         if (sc->listrecps != NULL) {
 607                 /* Fetch the message.  We're going to need to modify it
 608                  * in order to insert the [list name] in it, etc.
 609                  */
 610                 msg = CtdlFetchMessage(msgnum, 1);
 611                 if (msg != NULL) {
 612
 613                         /* Prepend "[List name]" to the subject */
 614                         if (msg->cm_fields['U'] == NULL) {
 615                                 msg->cm_fields['U'] = strdup("(no subject)");
 616                         }
 617                         snprintf(buf, sizeof buf, "[%s] %s", CC->room.QRname, msg->cm_fields['U']);
 618                         free(msg->cm_fields['U']);
 619                         msg->cm_fields['U'] = strdup(buf);
 620
 621                         /* Set the recipient of the list message to the
 622                          * email address of the room itself.
 623                          * FIXME ... I want to be able to pick any address
 624                          */
 625                         if (msg->cm_fields['R'] != NULL) {
 626                                 free(msg->cm_fields['R']);
 627                         }
 628                         msg->cm_fields['R'] = malloc(256);
 629                         snprintf(msg->cm_fields['R'], 256,
 630                                 "room_%s@%s", CC->room.QRname,
 631                                 config.c_fqdn);
 632                         for (i=0; msg->cm_fields['R'][i]; ++i) {
 633                                 if (isspace(msg->cm_fields['R'][i])) {
 634                                         msg->cm_fields['R'][i] = '_';
 635                                 }
 636                         }
 637
 638                         /* Handle delivery */
 639                         network_deliver_list(msg, sc);
 640                         CtdlFreeMessage(msg);
 641                 }
 642         }
 643
 644         /*
 645          * Process digest recipients
 646          */
 647         if ((sc->digestrecps != NULL) && (sc->digestfp != NULL)) {
 648                 msg = CtdlFetchMessage(msgnum, 1);
 649                 if (msg != NULL) {
 650                         fprintf(sc->digestfp,   " -----------------------------------"
 651                                                 "------------------------------------"
 652                                                 "-------\n");
 653                         fprintf(sc->digestfp, "From: ");
 654                         if (msg->cm_fields['A'] != NULL) {
 655                                 fprintf(sc->digestfp, "%s ", msg->cm_fields['A']);
 656                         }
 657                         if (msg->cm_fields['F'] != NULL) {
 658                                 fprintf(sc->digestfp, "<%s> ", msg->cm_fields['F']);
 659                         }
 660                         else if (msg->cm_fields['N'] != NULL) {
 661                                 fprintf(sc->digestfp, "@%s ", msg->cm_fields['N']);
 662                         }
 663                         fprintf(sc->digestfp, "\n");
 664                         if (msg->cm_fields['U'] != NULL) {
 665                                 fprintf(sc->digestfp, "Subject: %s\n", msg->cm_fields['U']);
 666                         }
 667
 668                         CC->redirect_buffer = malloc(SIZ);
 669                         CC->redirect_len = 0;
 670                         CC->redirect_alloc = SIZ;
 671
 672                         safestrncpy(CC->preferred_formats, "text/plain", sizeof CC->preferred_formats);
 673                         CtdlOutputPreLoadedMsg(msg, MT_CITADEL, HEADERS_NONE, 0, 0, 0);
 674
 675                         striplt(CC->redirect_buffer);
 676                         fprintf(sc->digestfp, "\n%s\n", CC->redirect_buffer);
 677
 678                         free(CC->redirect_buffer);
 679                         CC->redirect_buffer = NULL;
 680                         CC->redirect_len = 0;
 681                         CC->redirect_alloc = 0;
 682
 683                         sc->num_msgs_spooled += 1;
 684                         free(msg);
 685                 }
 686         }
 687
 688         /*
 689          * Process client-side list participations for this room
 690          */
 691         instr_len = SIZ;
 692         if (sc->participates != NULL) {
 693                 msg = CtdlFetchMessage(msgnum, 1);
 694                 if (msg != NULL) {
 695
 696                         /* Only send messages which originated on our own Citadel
 697                          * network, otherwise we'll end up sending the remote
 698                          * mailing list's messages back to it, which is rude...
 699                          */
 700                         ok_to_participate = 0;
 701                         if (msg->cm_fields['N'] != NULL) {
 702                                 if (!strcasecmp(msg->cm_fields['N'], config.c_nodename)) {
 703                                         ok_to_participate = 1;
 704                                 }
 705                                 if (is_valid_node(NULL, NULL, msg->cm_fields['N']) == 0) {
 706                                         ok_to_participate = 1;
 707                                 }
 708                         }
 709                         if (ok_to_participate) {
 710                                 if (msg->cm_fields['F'] != NULL) {
 711                                         free(msg->cm_fields['F']);
 712                                 }
 713                                 msg->cm_fields['F'] = malloc(SIZ);
 714                                 /* Replace the Internet email address of the actual
 715                                 * author with the email address of the room itself,
 716                                 * so the remote listserv doesn't reject us.
 717                                 * FIXME ... I want to be able to pick any address
 718                                 */
 719                                 snprintf(msg->cm_fields['F'], SIZ,
 720                                         "room_%s@%s", CC->room.QRname,
 721                                         config.c_fqdn);
 722                                 for (i=0; msg->cm_fields['F'][i]; ++i) {
 723                                         if (isspace(msg->cm_fields['F'][i])) {
 724                                                 msg->cm_fields['F'][i] = '_';
 725                                         }
 726                                 }
 727
 728                                 /*
 729                                  * Figure out how big a buffer we need to allocate
 730                                  */
 731                                 for (nptr = sc->participates; nptr != NULL; nptr = nptr->next) {
 732
 733                                         if (msg->cm_fields['R'] == NULL) {
 734                                                 free(msg->cm_fields['R']);
 735                                         }
 736                                         msg->cm_fields['R'] = strdup(nptr->name);
 737
 738                                         valid = validate_recipients(nptr->name, NULL, 0);
 739                                         CtdlSubmitMsg(msg, valid, "", 0);
 740                                         free_recipients(valid);
 741                                 }
 742
 743                         }
 744                         CtdlFreeMessage(msg);
 745                 }
 746         }
 747
 748         /*
 749          * Process IGnet push shares
 750          */
 751         msg = CtdlFetchMessage(msgnum, 1);
 752         if (msg != NULL) {
 753                 size_t newpath_len;
 754
 755                 /* Prepend our node name to the Path field whenever
 756                  * sending a message to another IGnet node
 757                  */
 758                 if (msg->cm_fields['P'] == NULL) {
 759                         msg->cm_fields['P'] = strdup("username");
 760                 }
 761                 newpath_len = strlen(msg->cm_fields['P']) +
 762                          strlen(config.c_nodename) + 2;
 763                 newpath = malloc(newpath_len);
 764                 snprintf(newpath, newpath_len, "%s!%s",
 765                          config.c_nodename, msg->cm_fields['P']);
 766                 free(msg->cm_fields['P']);
 767                 msg->cm_fields['P'] = newpath;
 768
 769                 /*
 770                  * Determine if this message is set to be deleted
 771                  * after sending out on the network
 772                  */
 773                 if (msg->cm_fields['S'] != NULL) {
 774                         if (!strcasecmp(msg->cm_fields['S'], "CANCEL")) {
 775                                 delete_after_send = 1;
 776                         }
 777                 }
 778
 779                 /* Now send it to every node */
 780                 if (sc->ignet_push_shares != NULL)
 781                   for (mptr = sc->ignet_push_shares; mptr != NULL;
 782                     mptr = mptr->next) {
 783
 784                         send = 1;
 785
 786                         /* Check for valid node name */
 787                         if (is_valid_node(NULL, NULL, mptr->remote_nodename) != 0) {
 788                                 CtdlLogPrintf(CTDL_ERR, "Invalid node <%s>\n", mptr->remote_nodename);
 789                                 send = 0;
 790                         }
 791
 792                         /* Check for split horizon */
 793                         CtdlLogPrintf(CTDL_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 794                         bang = num_tokens(msg->cm_fields['P'], '!');
 795                         if (bang > 1) for (i=0; i<(bang-1); ++i) {
 796                                 extract_token(buf, msg->cm_fields['P'], i, '!', sizeof buf);
 797                                 CtdlLogPrintf(CTDL_DEBUG, "Compare <%s> to <%s>\n",
 798                                         buf, mptr->remote_nodename) ;
 799                                 if (!strcasecmp(buf, mptr->remote_nodename)) {
 800                                         send = 0;
 801                                         CtdlLogPrintf(CTDL_DEBUG, "Not sending to %s\n",
 802                                                 mptr->remote_nodename);
 803                                 }
 804                                 else {
 805                                         CtdlLogPrintf(CTDL_DEBUG, "Sending to %s\n", mptr->remote_nodename);
 806                                 }
 807                         }
 808
 809                         /* Send the message */
 810                         if (send == 1) {
 811
 812                                 /*
 813                                  * Force the message to appear in the correct room
 814                                  * on the far end by setting the C field correctly
 815                                  */
 816                                 if (msg->cm_fields['C'] != NULL) {
 817                                         free(msg->cm_fields['C']);
 818                                 }
 819                                 if (!IsEmptyStr(mptr->remote_roomname)) {
 820                                         msg->cm_fields['C'] = strdup(mptr->remote_roomname);
 821                                 }
 822                                 else {
 823                                         msg->cm_fields['C'] = strdup(CC->room.QRname);
 824                                 }
 825
 826                                 /* serialize it for transmission */
 827                                 serialize_message(&sermsg, msg);
 828                                 if (sermsg.len > 0) {
 829
 830                                         /* write it to the spool file */
 831                                         snprintf(filename, sizeof filename,"%s/%s",
 832                                                         ctdl_netout_dir,
 833                                                         mptr->remote_nodename);
 834                                         CtdlLogPrintf(CTDL_DEBUG, "Appending to %s\n", filename);
 835                                         fp = fopen(filename, "ab");
 836                                         if (fp != NULL) {
 837                                                 fwrite(sermsg.ser,
 838                                                         sermsg.len, 1, fp);
 839                                                 fclose(fp);
 840                                         }
 841                                         else {
 842                                                 CtdlLogPrintf(CTDL_ERR, "%s: %s\n", filename, strerror(errno));
 843                                         }
 844
 845                                         /* free the serialized version */
 846                                         free(sermsg.ser);
 847                                 }
 848
 849                         }
 850                 }
 851                 CtdlFreeMessage(msg);
 852         }
 853
 854         /* update lastsent */
 855         sc->lastsent = msgnum;
 856
 857         /* Delete this message if delete-after-send is set */
 858         if (delete_after_send) {
 859                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 860         }
 861
 862 }
 863
 864
 865 int read_spoolcontrol_file(SpoolControl **scc, char *filename)
 866 {
 867         FILE *fp;
 868         char instr[SIZ];
 869         char buf[SIZ];
 870         char nodename[256];
 871         char roomname[ROOMNAMELEN];
 872         size_t miscsize = 0;
 873         size_t linesize = 0;
 874         int skipthisline = 0;
 875         namelist *nptr = NULL;
 876         maplist *mptr = NULL;
 877         SpoolControl *sc;
 878
 879         fp = fopen(filename, "r");
 880         if (fp == NULL) {
 881                 return 0;
 882         }
 883         sc = malloc(sizeof(SpoolControl));
 884         memset(sc, 0, sizeof(SpoolControl));
 885         *scc = sc;
 886
 887         while (fgets(buf, sizeof buf, fp) != NULL) {
 888                 buf[strlen(buf)-1] = 0;
 889
 890                 extract_token(instr, buf, 0, '|', sizeof instr);
 891                 if (!strcasecmp(instr, "lastsent")) {
 892                         sc->lastsent = extract_long(buf, 1);
 893                 }
 894                 else if (!strcasecmp(instr, "listrecp")) {
 895                         nptr = (namelist *)
 896                                 malloc(sizeof(namelist));
 897                         nptr->next = sc->listrecps;
 898                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 899                         sc->listrecps = nptr;
 900                 }
 901                 else if (!strcasecmp(instr, "participate")) {
 902                         nptr = (namelist *)
 903                                 malloc(sizeof(namelist));
 904                         nptr->next = sc->participates;
 905                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 906                         sc->participates = nptr;
 907                 }
 908                 else if (!strcasecmp(instr, "digestrecp")) {
 909                         nptr = (namelist *)
 910                                 malloc(sizeof(namelist));
 911                         nptr->next = sc->digestrecps;
 912                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 913                         sc->digestrecps = nptr;
 914                 }
 915                 else if (!strcasecmp(instr, "ignet_push_share")) {
 916                         extract_token(nodename, buf, 1, '|', sizeof nodename);
 917                         extract_token(roomname, buf, 2, '|', sizeof roomname);
 918                         mptr = (maplist *) malloc(sizeof(maplist));
 919                         mptr->next = sc->ignet_push_shares;
 920                         strcpy(mptr->remote_nodename, nodename);
 921                         strcpy(mptr->remote_roomname, roomname);
 922                         sc->ignet_push_shares = mptr;
 923                 }
 924                 else {
 925                         /* Preserve 'other' lines ... *unless* they happen to
 926                          * be subscribe/unsubscribe pendings with expired
 927                          * timestamps.
 928                          */
 929                         skipthisline = 0;
 930                         if (!strncasecmp(buf, "subpending|", 11)) {
 931                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
 932                                         skipthisline = 1;
 933                                 }
 934                         }
 935                         if (!strncasecmp(buf, "unsubpending|", 13)) {
 936                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
 937                                         skipthisline = 1;
 938                                 }
 939                         }
 940
 941                         if (skipthisline == 0) {
 942                                 linesize = strlen(buf);
 943                                 sc->misc = realloc(sc->misc,
 944                                         (miscsize + linesize + 2) );
 945                                 sprintf(&sc->misc[miscsize], "%s\n", buf);
 946                                 miscsize = miscsize + linesize + 1;
 947                         }
 948                 }
 949
 950
 951         }
 952         fclose(fp);
 953         return 1;
 954 }
 955
 956 void free_spoolcontrol_struct(SpoolControl **scc)
 957 {
 958         SpoolControl *sc;
 959         namelist *nptr = NULL;
 960         maplist *mptr = NULL;
 961
 962         sc = *scc;
 963         while (sc->listrecps != NULL) {
 964                 nptr = sc->listrecps->next;
 965                 free(sc->listrecps);
 966                 sc->listrecps = nptr;
 967         }
 968         /* Do the same for digestrecps */
 969         while (sc->digestrecps != NULL) {
 970                 nptr = sc->digestrecps->next;
 971                 free(sc->digestrecps);
 972                 sc->digestrecps = nptr;
 973         }
 974         /* Do the same for participates */
 975         while (sc->participates != NULL) {
 976                 nptr = sc->participates->next;
 977                 free(sc->participates);
 978                 sc->participates = nptr;
 979         }
 980         while (sc->ignet_push_shares != NULL) {
 981                 mptr = sc->ignet_push_shares->next;
 982                 free(sc->ignet_push_shares);
 983                 sc->ignet_push_shares = mptr;
 984         }
 985         free(sc->misc);
 986         free(sc);
 987         *scc=NULL;
 988 }
 989
 990 int writenfree_spoolcontrol_file(SpoolControl **scc, char *filename)
 991 {
 992         FILE *fp;
 993         SpoolControl *sc;
 994         namelist *nptr = NULL;
 995         maplist *mptr = NULL;
 996
 997         sc = *scc;
 998         fp = fopen(filename, "w");
 999         if (fp == NULL) {
1000                 CtdlLogPrintf(CTDL_CRIT, "ERROR: cannot open %s: %s\n",
1001                         filename, strerror(errno));
1002                 free_spoolcontrol_struct(scc);
1003         }
1004         else {
1005                 fprintf(fp, "lastsent|%ld\n", sc->lastsent);
1006
1007                 /* Write out the listrecps while freeing from memory at the
1008                  * same time.  Am I clever or what?  :)
1009                  */
1010                 while (sc->listrecps != NULL) {
1011                         fprintf(fp, "listrecp|%s\n", sc->listrecps->name);
1012                         nptr = sc->listrecps->next;
1013                         free(sc->listrecps);
1014                         sc->listrecps = nptr;
1015                 }
1016                 /* Do the same for digestrecps */
1017                 while (sc->digestrecps != NULL) {
1018                         fprintf(fp, "digestrecp|%s\n", sc->digestrecps->name);
1019                         nptr = sc->digestrecps->next;
1020                         free(sc->digestrecps);
1021                         sc->digestrecps = nptr;
1022                 }
1023                 /* Do the same for participates */
1024                 while (sc->participates != NULL) {
1025                         fprintf(fp, "participate|%s\n", sc->participates->name);
1026                         nptr = sc->participates->next;
1027                         free(sc->participates);
1028                         sc->participates = nptr;
1029                 }
1030                 while (sc->ignet_push_shares != NULL) {
1031                         fprintf(fp, "ignet_push_share|%s", sc->ignet_push_shares->remote_nodename);
1032                         if (!IsEmptyStr(sc->ignet_push_shares->remote_roomname)) {
1033                                 fprintf(fp, "|%s", sc->ignet_push_shares->remote_roomname);
1034                         }
1035                         fprintf(fp, "\n");
1036                         mptr = sc->ignet_push_shares->next;
1037                         free(sc->ignet_push_shares);
1038                         sc->ignet_push_shares = mptr;
1039                 }
1040                 if (sc->misc != NULL) {
1041                         fwrite(sc->misc, strlen(sc->misc), 1, fp);
1042                 }
1043                 free(sc->misc);
1044
1045                 fclose(fp);
1046                 free(sc);
1047                 *scc=NULL;
1048         }
1049         return 1;
1050 }
1051 int is_recipient(SpoolControl *sc, const char *Name)
1052 {
1053         namelist *nptr;
1054         size_t len;
1055
1056         len = strlen(Name);
1057         nptr = sc->listrecps;
1058         while (nptr != NULL) {
1059                 if (strncmp(Name, nptr->name, len)==0)
1060                         return 1;
1061                 nptr = nptr->next;
1062         }
1063         /* Do the same for digestrecps */
1064         nptr = sc->digestrecps;
1065         while (nptr != NULL) {
1066                 if (strncmp(Name, nptr->name, len)==0)
1067                         return 1;
1068                 nptr = nptr->next;
1069         }
1070         /* Do the same for participates */
1071         nptr = sc->participates;
1072         while (nptr != NULL) {
1073                 if (strncmp(Name, nptr->name, len)==0)
1074                         return 1;
1075                 nptr = nptr->next;
1076         }
1077         return 0;
1078 }
1079
1080
1081 /*
1082  * Batch up and send all outbound traffic from the current room
1083  */
1084 void network_spoolout_room(char *room_to_spool) {
1085         char buf[SIZ];
1086         char filename[PATH_MAX];
1087         SpoolControl *sc;
1088         int i;
1089
1090         /*
1091          * If the room doesn't exist, don't try to perform its networking tasks.
1092          * Normally this should never happen, but once in a while maybe a room gets
1093          * queued for networking and then deleted before it can happen.
1094          */
1095         if (getroom(&CC->room, room_to_spool) != 0) {
1096                 CtdlLogPrintf(CTDL_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
1097                 return;
1098         }
1099
1100         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1101         begin_critical_section(S_NETCONFIGS);
1102
1103         /* Only do net processing for rooms that have netconfigs */
1104         if (!read_spoolcontrol_file(&sc, filename))
1105         {
1106                 end_critical_section(S_NETCONFIGS);
1107                 return;
1108         }
1109         CtdlLogPrintf(CTDL_INFO, "Networking started for <%s>\n", CC->room.QRname);
1110
1111         /* If there are digest recipients, we have to build a digest */
1112         if (sc->digestrecps != NULL) {
1113                 sc->digestfp = tmpfile();
1114                 fprintf(sc->digestfp, "Content-type: text/plain\n\n");
1115         }
1116
1117         /* Do something useful */
1118         CtdlForEachMessage(MSGS_GT, sc->lastsent, NULL, NULL, NULL,
1119                 network_spool_msg, sc);
1120
1121         /* If we wrote a digest, deliver it and then close it */
1122         snprintf(buf, sizeof buf, "room_%s@%s",
1123                 CC->room.QRname, config.c_fqdn);
1124         for (i=0; buf[i]; ++i) {
1125                 buf[i] = tolower(buf[i]);
1126                 if (isspace(buf[i])) buf[i] = '_';
1127         }
1128         if (sc->digestfp != NULL) {
1129                 fprintf(sc->digestfp,   " -----------------------------------"
1130                                         "------------------------------------"
1131                                         "-------\n"
1132                                         "You are subscribed to the '%s' "
1133                                         "list.\n"
1134                                         "To post to the list: %s\n",
1135                                         CC->room.QRname, buf
1136                 );
1137                 network_deliver_digest(sc);     /* deliver and close */
1138         }
1139
1140         /* Now rewrite the config file */
1141         writenfree_spoolcontrol_file (&sc, filename);
1142         end_critical_section(S_NETCONFIGS);
1143 }
1144
1145
1146
1147 /*
1148  * Send the *entire* contents of the current room to one specific network node,
1149  * ignoring anything we know about which messages have already undergone
1150  * network processing.  This can be used to bring a new node into sync.
1151  */
1152 int network_sync_to(char *target_node) {
1153         SpoolControl sc;
1154         int num_spooled = 0;
1155         int found_node = 0;
1156         char buf[256];
1157         char sc_type[256];
1158         char sc_node[256];
1159         char sc_room[256];
1160         char filename[PATH_MAX];
1161         FILE *fp;
1162
1163         /* Grab the configuration line we're looking for */
1164         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1165         begin_critical_section(S_NETCONFIGS);
1166         fp = fopen(filename, "r");
1167         if (fp == NULL) {
1168                 end_critical_section(S_NETCONFIGS);
1169                 return(-1);
1170         }
1171         while (fgets(buf, sizeof buf, fp) != NULL) {
1172                 buf[strlen(buf)-1] = 0;
1173                 extract_token(sc_type, buf, 0, '|', sizeof sc_type);
1174                 extract_token(sc_node, buf, 1, '|', sizeof sc_node);
1175                 extract_token(sc_room, buf, 2, '|', sizeof sc_room);
1176                 if ( (!strcasecmp(sc_type, "ignet_push_share"))
1177                    && (!strcasecmp(sc_node, target_node)) ) {
1178                         found_node = 1;
1179
1180                         /* Concise syntax because we don't need a full linked-list */
1181                         memset(&sc, 0, sizeof(SpoolControl));
1182                         sc.ignet_push_shares = (maplist *)
1183                                 malloc(sizeof(maplist));
1184                         sc.ignet_push_shares->next = NULL;
1185                         safestrncpy(sc.ignet_push_shares->remote_nodename,
1186                                 sc_node,
1187                                 sizeof sc.ignet_push_shares->remote_nodename);
1188                         safestrncpy(sc.ignet_push_shares->remote_roomname,
1189                                 sc_room,
1190                                 sizeof sc.ignet_push_shares->remote_roomname);
1191                 }
1192         }
1193         fclose(fp);
1194         end_critical_section(S_NETCONFIGS);
1195
1196         if (!found_node) return(-1);
1197
1198         /* Send ALL messages */
1199         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL,
1200                 network_spool_msg, &sc);
1201
1202         /* Concise cleanup because we know there's only one node in the sc */
1203         free(sc.ignet_push_shares);
1204
1205         CtdlLogPrintf(CTDL_NOTICE, "Synchronized %d messages to <%s>\n",
1206                 num_spooled, target_node);
1207         return(num_spooled);
1208 }
1209
1210
1211 /*
1212  * Implements the NSYN command
1213  */
1214 void cmd_nsyn(char *argbuf) {
1215         int num_spooled;
1216         char target_node[256];
1217
1218         if (CtdlAccessCheck(ac_aide)) return;
1219
1220         extract_token(target_node, argbuf, 0, '|', sizeof target_node);
1221         num_spooled = network_sync_to(target_node);
1222         if (num_spooled >= 0) {
1223                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
1224         }
1225         else {
1226                 cprintf("%d No such room/node share exists.\n",
1227                         ERROR + ROOM_NOT_FOUND);
1228         }
1229 }
1230
1231
1232
1233 /*
1234  * Batch up and send all outbound traffic from the current room
1235  */
1236 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
1237         struct RoomProcList *ptr;
1238
1239         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
1240         if (ptr == NULL) return;
1241
1242         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
1243         begin_critical_section(S_RPLIST);
1244         ptr->next = rplist;
1245         rplist = ptr;
1246         end_critical_section(S_RPLIST);
1247 }
1248
1249 void destroy_network_queue_room(void)
1250 {
1251         struct RoomProcList *cur, *p;
1252         NetMap *nmcur, *nmp;
1253
1254         cur = rplist;
1255         begin_critical_section(S_RPLIST);
1256         while (cur != NULL)
1257         {
1258                 p = cur->next;
1259                 free (cur);
1260                 cur = p;
1261         }
1262         rplist = NULL;
1263         end_critical_section(S_RPLIST);
1264
1265         nmcur = the_netmap;
1266         while (nmcur != NULL)
1267         {
1268                 nmp = nmcur->next;
1269                 free (nmcur);
1270                 nmcur = nmp;
1271         }
1272         the_netmap = NULL;
1273         if (working_ignetcfg != NULL)
1274                 free (working_ignetcfg);
1275         working_ignetcfg = NULL;
1276 }
1277
1278
1279 /*
1280  * Learn topology from path fields
1281  */
1282 void network_learn_topology(char *node, char *path) {
1283         char nexthop[256];
1284         NetMap *nmptr;
1285
1286         strcpy(nexthop, "");
1287
1288         if (num_tokens(path, '!') < 3) return;
1289         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
1290                 if (!strcasecmp(nmptr->nodename, node)) {
1291                         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1292                         nmptr->lastcontact = time(NULL);
1293                         ++netmap_changed;
1294                         return;
1295                 }
1296         }
1297
1298         /* If we got here then it's not in the map, so add it. */
1299         nmptr = (NetMap *) malloc(sizeof (NetMap));
1300         strcpy(nmptr->nodename, node);
1301         nmptr->lastcontact = time(NULL);
1302         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1303         nmptr->next = the_netmap;
1304         the_netmap = nmptr;
1305         ++netmap_changed;
1306 }
1307
1308
1309
1310
1311 /*
1312  * Bounce a message back to the sender
1313  */
1314 void network_bounce(struct CtdlMessage *msg, char *reason) {
1315         char *oldpath = NULL;
1316         char buf[SIZ];
1317         char bouncesource[SIZ];
1318         char recipient[SIZ];
1319         struct recptypes *valid = NULL;
1320         char force_room[ROOMNAMELEN];
1321         static int serialnum = 0;
1322         size_t size;
1323
1324         CtdlLogPrintf(CTDL_DEBUG, "entering network_bounce()\n");
1325
1326         if (msg == NULL) return;
1327
1328         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
1329
1330         /*
1331          * Give it a fresh message ID
1332          */
1333         if (msg->cm_fields['I'] != NULL) {
1334                 free(msg->cm_fields['I']);
1335         }
1336         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
1337                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
1338         msg->cm_fields['I'] = strdup(buf);
1339
1340         /*
1341          * FIXME ... right now we're just sending a bounce; we really want to
1342          * include the text of the bounced message.
1343          */
1344         if (msg->cm_fields['M'] != NULL) {
1345                 free(msg->cm_fields['M']);
1346         }
1347         msg->cm_fields['M'] = strdup(reason);
1348         msg->cm_format_type = 0;
1349
1350         /*
1351          * Turn the message around
1352          */
1353         if (msg->cm_fields['R'] == NULL) {
1354                 free(msg->cm_fields['R']);
1355         }
1356
1357         if (msg->cm_fields['D'] == NULL) {
1358                 free(msg->cm_fields['D']);
1359         }
1360
1361         snprintf(recipient, sizeof recipient, "%s@%s",
1362                 msg->cm_fields['A'], msg->cm_fields['N']);
1363
1364         if (msg->cm_fields['A'] == NULL) {
1365                 free(msg->cm_fields['A']);
1366         }
1367
1368         if (msg->cm_fields['N'] == NULL) {
1369                 free(msg->cm_fields['N']);
1370         }
1371
1372         if (msg->cm_fields['U'] == NULL) {
1373                 free(msg->cm_fields['U']);
1374         }
1375
1376         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1377         msg->cm_fields['N'] = strdup(config.c_nodename);
1378         msg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
1379
1380         /* prepend our node to the path */
1381         if (msg->cm_fields['P'] != NULL) {
1382                 oldpath = msg->cm_fields['P'];
1383                 msg->cm_fields['P'] = NULL;
1384         }
1385         else {
1386                 oldpath = strdup("unknown_user");
1387         }
1388         size = strlen(oldpath) + SIZ;
1389         msg->cm_fields['P'] = malloc(size);
1390         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1391         free(oldpath);
1392
1393         /* Now submit the message */
1394         valid = validate_recipients(recipient, NULL, 0);
1395         if (valid != NULL) if (valid->num_error != 0) {
1396                 free_recipients(valid);
1397                 valid = NULL;
1398         }
1399         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1400                 strcpy(force_room, config.c_aideroom);
1401         }
1402         else {
1403                 strcpy(force_room, "");
1404         }
1405         if ( (valid == NULL) && IsEmptyStr(force_room) ) {
1406                 strcpy(force_room, config.c_aideroom);
1407         }
1408         CtdlSubmitMsg(msg, valid, force_room, 0);
1409
1410         /* Clean up */
1411         if (valid != NULL) free_recipients(valid);
1412         CtdlFreeMessage(msg);
1413         CtdlLogPrintf(CTDL_DEBUG, "leaving network_bounce()\n");
1414 }
1415
1416
1417
1418
1419 /*
1420  * Process a buffer containing a single message from a single file
1421  * from the inbound queue
1422  */
1423 void network_process_buffer(char *buffer, long size) {
1424         struct CtdlMessage *msg = NULL;
1425         long pos;
1426         int field;
1427         struct recptypes *recp = NULL;
1428         char target_room[ROOMNAMELEN];
1429         struct ser_ret sermsg;
1430         char *oldpath = NULL;
1431         char filename[PATH_MAX];
1432         FILE *fp;
1433         char nexthop[SIZ];
1434         unsigned char firstbyte;
1435         unsigned char lastbyte;
1436
1437         /* Validate just a little bit.  First byte should be FF and * last byte should be 00. */
1438         firstbyte = buffer[0];
1439         lastbyte = buffer[size-1];
1440         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1441                 CtdlLogPrintf(CTDL_ERR, "Corrupt message ignored.  Length=%ld, firstbyte = %d, lastbyte = %d\n",
1442                         size, firstbyte, lastbyte);
1443                 return;
1444         }
1445
1446         /* Set default target room to trash */
1447         strcpy(target_room, TWITROOM);
1448
1449         /* Load the message into memory */
1450         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1451         memset(msg, 0, sizeof(struct CtdlMessage));
1452         msg->cm_magic = CTDLMESSAGE_MAGIC;
1453         msg->cm_anon_type = buffer[1];
1454         msg->cm_format_type = buffer[2];
1455
1456         for (pos = 3; pos < size; ++pos) {
1457                 field = buffer[pos];
1458                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1459                 pos = pos + strlen(&buffer[(int)pos]);
1460         }
1461
1462         /* Check for message routing */
1463         if (msg->cm_fields['D'] != NULL) {
1464                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1465
1466                         /* route the message */
1467                         strcpy(nexthop, "");
1468                         if (is_valid_node(nexthop, NULL, msg->cm_fields['D']) == 0) {
1469                                 /* prepend our node to the path */
1470                                 if (msg->cm_fields['P'] != NULL) {
1471                                         oldpath = msg->cm_fields['P'];
1472                                         msg->cm_fields['P'] = NULL;
1473                                 }
1474                                 else {
1475                                         oldpath = strdup("unknown_user");
1476                                 }
1477                                 size = strlen(oldpath) + SIZ;
1478                                 msg->cm_fields['P'] = malloc(size);
1479                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1480                                         config.c_nodename, oldpath);
1481                                 free(oldpath);
1482
1483                                 /* serialize the message */
1484                                 serialize_message(&sermsg, msg);
1485
1486                                 /* now send it */
1487                                 if (IsEmptyStr(nexthop)) {
1488                                         strcpy(nexthop, msg->cm_fields['D']);
1489                                 }
1490                                 snprintf(filename,
1491                                                  sizeof filename,
1492                                                  "%s/%s",
1493                                                  ctdl_netout_dir,
1494                                                  nexthop);
1495                                 CtdlLogPrintf(CTDL_DEBUG, "Appending to %s\n", filename);
1496                                 fp = fopen(filename, "ab");
1497                                 if (fp != NULL) {
1498                                         fwrite(sermsg.ser,
1499                                                 sermsg.len, 1, fp);
1500                                         fclose(fp);
1501                                 }
1502                                 else {
1503                                         CtdlLogPrintf(CTDL_ERR, "%s: %s\n", filename, strerror(errno));
1504                                 }
1505                                 free(sermsg.ser);
1506                                 CtdlFreeMessage(msg);
1507                                 return;
1508                         }
1509
1510                         else {  /* invalid destination node name */
1511
1512                                 network_bounce(msg,
1513 "A message you sent could not be delivered due to an invalid destination node"
1514 " name.  Please check the address and try sending the message again.\n");
1515                                 msg = NULL;
1516                                 return;
1517
1518                         }
1519                 }
1520         }
1521
1522         /*
1523          * Check to see if we already have a copy of this message, and
1524          * abort its processing if so.  (We used to post a warning to Aide>
1525          * every time this happened, but the network is now so densely
1526          * connected that it's inevitable.)
1527          */
1528         if (network_usetable(msg) != 0) {
1529                 CtdlFreeMessage(msg);
1530                 return;
1531         }
1532
1533         /* Learn network topology from the path */
1534         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1535                 network_learn_topology(msg->cm_fields['N'],
1536                                         msg->cm_fields['P']);
1537         }
1538
1539         /* Is the sending node giving us a very persuasive suggestion about
1540          * which room this message should be saved in?  If so, go with that.
1541          */
1542         if (msg->cm_fields['C'] != NULL) {
1543                 safestrncpy(target_room,
1544                         msg->cm_fields['C'],
1545                         sizeof target_room);
1546         }
1547
1548         /* Otherwise, does it have a recipient?  If so, validate it... */
1549         else if (msg->cm_fields['R'] != NULL) {
1550                 recp = validate_recipients(msg->cm_fields['R'], NULL, 0);
1551                 if (recp != NULL) if (recp->num_error != 0) {
1552                         network_bounce(msg,
1553                                 "A message you sent could not be delivered due to an invalid address.\n"
1554                                 "Please check the address and try sending the message again.\n");
1555                         msg = NULL;
1556                         free_recipients(recp);
1557                         return;
1558                 }
1559                 strcpy(target_room, "");        /* no target room if mail */
1560         }
1561
1562         /* Our last shot at finding a home for this message is to see if
1563          * it has the O field (Originating room) set.
1564          */
1565         else if (msg->cm_fields['O'] != NULL) {
1566                 safestrncpy(target_room,
1567                         msg->cm_fields['O'],
1568                         sizeof target_room);
1569         }
1570
1571         /* Strip out fields that are only relevant during transit */
1572         if (msg->cm_fields['D'] != NULL) {
1573                 free(msg->cm_fields['D']);
1574                 msg->cm_fields['D'] = NULL;
1575         }
1576         if (msg->cm_fields['C'] != NULL) {
1577                 free(msg->cm_fields['C']);
1578                 msg->cm_fields['C'] = NULL;
1579         }
1580
1581         /* save the message into a room */
1582         if (PerformNetprocHooks(msg, target_room) == 0) {
1583                 msg->cm_flags = CM_SKIP_HOOKS;
1584                 CtdlSubmitMsg(msg, recp, target_room, 0);
1585         }
1586         CtdlFreeMessage(msg);
1587         free_recipients(recp);
1588 }
1589
1590
1591 /*
1592  * Process a single message from a single file from the inbound queue
1593  */
1594 void network_process_message(FILE *fp, long msgstart, long msgend) {
1595         long hold_pos;
1596         long size;
1597         char *buffer;
1598
1599         hold_pos = ftell(fp);
1600         size = msgend - msgstart + 1;
1601         buffer = malloc(size);
1602         if (buffer != NULL) {
1603                 fseek(fp, msgstart, SEEK_SET);
1604                 fread(buffer, size, 1, fp);
1605                 network_process_buffer(buffer, size);
1606                 free(buffer);
1607         }
1608
1609         fseek(fp, hold_pos, SEEK_SET);
1610 }
1611
1612
1613 /*
1614  * Process a single file from the inbound queue
1615  */
1616 void network_process_file(char *filename) {
1617         FILE *fp;
1618         long msgstart = (-1L);
1619         long msgend = (-1L);
1620         long msgcur = 0L;
1621         int ch;
1622
1623
1624         fp = fopen(filename, "rb");
1625         if (fp == NULL) {
1626                 CtdlLogPrintf(CTDL_CRIT, "Error opening %s: %s\n", filename, strerror(errno));
1627                 return;
1628         }
1629
1630         fseek(fp, 0L, SEEK_END);
1631         CtdlLogPrintf(CTDL_INFO, "network: processing %ld bytes from %s\n", ftell(fp), filename);
1632         rewind(fp);
1633
1634         /* Look for messages in the data stream and break them out */
1635         while (ch = getc(fp), ch >= 0) {
1636
1637                 if (ch == 255) {
1638                         if (msgstart >= 0L) {
1639                                 msgend = msgcur - 1;
1640                                 network_process_message(fp, msgstart, msgend);
1641                         }
1642                         msgstart = msgcur;
1643                 }
1644
1645                 ++msgcur;
1646         }
1647
1648         msgend = msgcur - 1;
1649         if (msgstart >= 0L) {
1650                 network_process_message(fp, msgstart, msgend);
1651         }
1652
1653         fclose(fp);
1654         unlink(filename);
1655 }
1656
1657
1658 /*
1659  * Process anything in the inbound queue
1660  */
1661 void network_do_spoolin(void) {
1662         DIR *dp;
1663         struct dirent *d;
1664         struct stat statbuf;
1665         char filename[PATH_MAX];
1666         static time_t last_spoolin_mtime = 0L;
1667
1668         /*
1669          * Check the spoolin directory's modification time.  If it hasn't
1670          * been touched, we don't need to scan it.
1671          */
1672         if (stat(ctdl_netin_dir, &statbuf)) return;
1673         if (statbuf.st_mtime == last_spoolin_mtime) {
1674                 CtdlLogPrintf(CTDL_DEBUG, "network: nothing in inbound queue\n");
1675                 return;
1676         }
1677         last_spoolin_mtime = statbuf.st_mtime;
1678         CtdlLogPrintf(CTDL_DEBUG, "network: processing inbound queue\n");
1679
1680         /*
1681          * Ok, there's something interesting in there, so scan it.
1682          */
1683         dp = opendir(ctdl_netin_dir);
1684         if (dp == NULL) return;
1685
1686         while (d = readdir(dp), d != NULL) {
1687                 if ((strcmp(d->d_name, ".")) && (strcmp(d->d_name, ".."))) {
1688                         snprintf(filename,
1689                                          sizeof filename,
1690                                          "%s/%s",
1691                                          ctdl_netin_dir,
1692                                          d->d_name);
1693                         network_process_file(filename);
1694                 }
1695         }
1696
1697         closedir(dp);
1698 }
1699
1700 /*
1701  * Delete any files in the outbound queue that were intended
1702  * to be sent to nodes which no longer exist.
1703  */
1704 void network_purge_spoolout(void) {
1705         DIR *dp;
1706         struct dirent *d;
1707         char filename[PATH_MAX];
1708         char nexthop[256];
1709         int i;
1710
1711         dp = opendir(ctdl_netout_dir);
1712         if (dp == NULL) return;
1713
1714         while (d = readdir(dp), d != NULL) {
1715                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
1716                         continue;
1717                 snprintf(filename,
1718                                  sizeof filename,
1719                                  "%s/%s",
1720                                  ctdl_netout_dir,
1721                                  d->d_name);
1722
1723                 strcpy(nexthop, "");
1724                 i = is_valid_node(nexthop, NULL, d->d_name);
1725
1726                 if ( (i != 0) || !IsEmptyStr(nexthop) ) {
1727                         unlink(filename);
1728                 }
1729         }
1730
1731
1732         closedir(dp);
1733 }
1734
1735
1736 /*
1737  * receive network spool from the remote system
1738  */
1739 void receive_spool(int sock, char *remote_nodename) {
1740         long download_len = 0L;
1741         long bytes_received = 0L;
1742         long bytes_copied = 0L;
1743         char buf[SIZ];
1744         static char pbuf[IGNET_PACKET_SIZE];
1745         char tempfilename[PATH_MAX];
1746         char filename[PATH_MAX];
1747         long plen;
1748         FILE *fp, *newfp;
1749
1750         CtdlMakeTempFileName(tempfilename, sizeof tempfilename);
1751         if (sock_puts(sock, "NDOP") < 0) return;
1752         if (sock_getln(sock, buf, sizeof buf) < 0) return;
1753         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1754         if (buf[0] != '2') {
1755                 return;
1756         }
1757         download_len = extract_long(&buf[4], 0);
1758
1759         bytes_received = 0L;
1760         fp = fopen(tempfilename, "w");
1761         if (fp == NULL) {
1762                 CtdlLogPrintf(CTDL_CRIT, "cannot open download file locally: %s\n",
1763                         strerror(errno));
1764                 return;
1765         }
1766
1767         while (bytes_received < download_len) {
1768                 /**
1769                  * If shutting down we can exit here and unlink the temp file.
1770                  * this shouldn't loose us any messages.
1771                  */
1772                 if (CtdlThreadCheckStop())
1773                 {
1774                         fclose(fp);
1775                         unlink(tempfilename);
1776                         return;
1777                 }
1778                 snprintf(buf, sizeof buf, "READ %ld|%ld",
1779                         bytes_received,
1780                      ((download_len - bytes_received > IGNET_PACKET_SIZE)
1781                  ? IGNET_PACKET_SIZE : (download_len - bytes_received)));
1782                 if (sock_puts(sock, buf) < 0) {
1783                         fclose(fp);
1784                         unlink(tempfilename);
1785                         return;
1786                 }
1787                 if (sock_getln(sock, buf, sizeof buf) < 0) {
1788                         fclose(fp);
1789                         unlink(tempfilename);
1790                         return;
1791                 }
1792                 if (buf[0] == '6') {
1793                         plen = extract_long(&buf[4], 0);
1794                         if (sock_read(sock, pbuf, plen, 1) < 0) {
1795                                 fclose(fp);
1796                                 unlink(tempfilename);
1797                                 return;
1798                         }
1799                         fwrite((char *) pbuf, plen, 1, fp);
1800                         bytes_received = bytes_received + plen;
1801                 }
1802         }
1803
1804         fclose(fp);
1805         /** Last chance for shutdown exit */
1806         if (CtdlThreadCheckStop())
1807         {
1808                 unlink(tempfilename);
1809                 return;
1810         }
1811         if (sock_puts(sock, "CLOS") < 0) {
1812                 unlink(tempfilename);
1813                 return;
1814         }
1815         /**
1816          * From here on we must complete or messages will get lost
1817          */
1818         if (sock_getln(sock, buf, sizeof buf) < 0) {
1819                 unlink(tempfilename);
1820                 return;
1821         }
1822         if (download_len > 0) {
1823                 CtdlLogPrintf(CTDL_NOTICE, "Received %ld octets from <%s>\n", download_len, remote_nodename);
1824         }
1825         CtdlLogPrintf(CTDL_DEBUG, "%s\n", buf);
1826
1827         /* Now copy the temp file to its permanent location.
1828          * (We copy instead of link because they may be on different filesystems)
1829          */
1830         begin_critical_section(S_NETSPOOL);
1831         snprintf(filename,
1832                          sizeof filename,
1833                          "%s/%s.%ld",
1834                          ctdl_netin_dir,
1835                          remote_nodename,
1836                          (long) getpid()
1837         );
1838         fp = fopen(tempfilename, "r");
1839         if (fp != NULL) {
1840                 newfp = fopen(filename, "w");
1841                 if (newfp != NULL) {
1842                         bytes_copied = 0L;
1843                         while (bytes_copied < download_len) {
1844                                 plen = download_len - bytes_copied;
1845                                 if (plen > sizeof buf) {
1846                                         plen = sizeof buf;
1847                                 }
1848                                 fread(buf, plen, 1, fp);
1849                                 fwrite(buf, plen, 1, newfp);
1850                                 bytes_copied += plen;
1851                         }
1852                         fclose(newfp);
1853                 }
1854                 fclose(fp);
1855         }
1856         end_critical_section(S_NETSPOOL);
1857         unlink(tempfilename);
1858 }
1859
1860
1861
1862 /*
1863  * transmit network spool to the remote system
1864  */
1865 void transmit_spool(int sock, char *remote_nodename)
1866 {
1867         char buf[SIZ];
1868         char pbuf[4096];
1869         long plen;
1870         long bytes_to_write, thisblock, bytes_written;
1871         int fd;
1872         char sfname[128];
1873
1874         if (sock_puts(sock, "NUOP") < 0) return;
1875         if (sock_getln(sock, buf, sizeof buf) < 0) return;
1876         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1877         if (buf[0] != '2') {
1878                 return;
1879         }
1880
1881         snprintf(sfname, sizeof sfname,
1882                          "%s/%s",
1883                          ctdl_netout_dir,
1884                          remote_nodename);
1885         fd = open(sfname, O_RDONLY);
1886         if (fd < 0) {
1887                 if (errno != ENOENT) {
1888                         CtdlLogPrintf(CTDL_CRIT, "cannot open upload file locally: %s\n",
1889                                 strerror(errno));
1890                 }
1891                 return;
1892         }
1893         bytes_written = 0;
1894         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
1895                 bytes_to_write = plen;
1896                 while (bytes_to_write > 0L) {
1897                         /** Exit if shutting down */
1898                         if (CtdlThreadCheckStop())
1899                         {
1900                                 close(fd);
1901                                 return;
1902                         }
1903
1904                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
1905                         if (sock_puts(sock, buf) < 0) {
1906                                 close(fd);
1907                                 return;
1908                         }
1909                         if (sock_getln(sock, buf, sizeof buf) < 0) {
1910                                 close(fd);
1911                                 return;
1912                         }
1913                         thisblock = atol(&buf[4]);
1914                         if (buf[0] == '7') {
1915                                 if (sock_write(sock, pbuf,
1916                                    (int) thisblock) < 0) {
1917                                         close(fd);
1918                                         return;
1919                                 }
1920                                 bytes_to_write -= thisblock;
1921                                 bytes_written += thisblock;
1922                         } else {
1923                                 goto ABORTUPL;
1924                         }
1925                 }
1926         }
1927
1928 ABORTUPL:
1929         close(fd);
1930         /** Last chance for shutdown exit */
1931         if(CtdlThreadCheckStop())
1932                 return;
1933
1934         if (sock_puts(sock, "UCLS 1") < 0) return;
1935         /**
1936          * From here on we must complete or messages will get lost
1937          */
1938         if (sock_getln(sock, buf, sizeof buf) < 0) return;
1939         CtdlLogPrintf(CTDL_NOTICE, "Sent %ld octets to <%s>\n",
1940                         bytes_written, remote_nodename);
1941         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1942         if (buf[0] == '2') {
1943                 CtdlLogPrintf(CTDL_DEBUG, "Removing <%s>\n", sfname);
1944                 unlink(sfname);
1945         }
1946 }
1947
1948
1949
1950 /*
1951  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
1952  */
1953 void network_poll_node(char *node, char *secret, char *host, char *port) {
1954         int sock;
1955         char buf[SIZ];
1956         char err_buf[SIZ];
1957         char connected_to[SIZ];
1958
1959         if (network_talking_to(node, NTT_CHECK)) return;
1960         network_talking_to(node, NTT_ADD);
1961         CtdlLogPrintf(CTDL_NOTICE, "Connecting to <%s> at %s:%s\n", node, host, port);
1962
1963         sock = sock_connect(host, port, "tcp");
1964         if (sock < 0) {
1965                 CtdlLogPrintf(CTDL_ERR, "Could not connect: %s\n", strerror(errno));
1966                 network_talking_to(node, NTT_REMOVE);
1967                 return;
1968         }
1969
1970         CtdlLogPrintf(CTDL_DEBUG, "Connected!\n");
1971
1972         /* Read the server greeting */
1973         if (sock_getln(sock, buf, sizeof buf) < 0) goto bail;
1974         CtdlLogPrintf(CTDL_DEBUG, ">%s\n", buf);
1975
1976         /* Check that the remote is who we think it is and warn the Aide if not */
1977         extract_token (connected_to, buf, 1, ' ', sizeof connected_to);
1978         if (strcmp(connected_to, node))
1979         {
1980                 snprintf (err_buf, sizeof(err_buf), "Connected to node \"%s\" but I was expecting to connect to node \"%s\".", connected_to, node);
1981                 aide_message(err_buf, "IGNet Networking error.");
1982         }
1983
1984         /* Identify ourselves */
1985         snprintf(buf, sizeof buf, "NETP %s|%s", config.c_nodename, secret);
1986         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1987         if (sock_puts(sock, buf) <0) goto bail;
1988         if (sock_getln(sock, buf, sizeof buf) < 0) goto bail;
1989         CtdlLogPrintf(CTDL_DEBUG, ">%s\n", buf);
1990         if (buf[0] != '2') goto bail;
1991
1992         /* At this point we are authenticated. */
1993         if (!CtdlThreadCheckStop())
1994                 receive_spool(sock, node);
1995         if (!CtdlThreadCheckStop())
1996                 transmit_spool(sock, node);
1997
1998         sock_puts(sock, "QUIT");
1999 bail:   sock_close(sock);
2000         network_talking_to(node, NTT_REMOVE);
2001 }
2002
2003
2004
2005 /*
2006  * Poll other Citadel nodes and transfer inbound/outbound network data.
2007  * Set "full" to nonzero to force a poll of every node, or to zero to poll
2008  * only nodes to which we have data to send.
2009  */
2010 void network_poll_other_citadel_nodes(int full_poll) {
2011         int i;
2012         char linebuf[256];
2013         char node[SIZ];
2014         char host[256];
2015         char port[256];
2016         char secret[256];
2017         int poll = 0;
2018         char spoolfile[256];
2019
2020         if (working_ignetcfg == NULL) {
2021                 CtdlLogPrintf(CTDL_DEBUG, "No nodes defined - not polling\n");
2022                 return;
2023         }
2024
2025         /* Use the string tokenizer to grab one line at a time */
2026         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
2027                 if(CtdlThreadCheckStop())
2028                         return;
2029                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
2030                 extract_token(node, linebuf, 0, '|', sizeof node);
2031                 extract_token(secret, linebuf, 1, '|', sizeof secret);
2032                 extract_token(host, linebuf, 2, '|', sizeof host);
2033                 extract_token(port, linebuf, 3, '|', sizeof port);
2034                 if ( !IsEmptyStr(node) && !IsEmptyStr(secret)
2035                    && !IsEmptyStr(host) && !IsEmptyStr(port)) {
2036                         poll = full_poll;
2037                         if (poll == 0) {
2038                                 snprintf(spoolfile,
2039                                                  sizeof spoolfile,
2040                                                  "%s/%s",
2041                                                  ctdl_netout_dir,
2042                                                  node);
2043                                 if (access(spoolfile, R_OK) == 0) {
2044                                         poll = 1;
2045                                 }
2046                         }
2047                         if (poll) {
2048                                 network_poll_node(node, secret, host, port);
2049                         }
2050                 }
2051         }
2052
2053 }
2054
2055
2056
2057
2058 /*
2059  * It's ok if these directories already exist.  Just fail silently.
2060  */
2061 void create_spool_dirs(void) {
2062         mkdir(ctdl_spool_dir, 0700);
2063         chown(ctdl_spool_dir, CTDLUID, (-1));
2064         mkdir(ctdl_netin_dir, 0700);
2065         chown(ctdl_netin_dir, CTDLUID, (-1));
2066         mkdir(ctdl_netout_dir, 0700);
2067         chown(ctdl_netout_dir, CTDLUID, (-1));
2068 }
2069
2070
2071
2072
2073
2074 /*
2075  * network_do_queue()
2076  *
2077  * Run through the rooms doing various types of network stuff.
2078  */
2079 void *network_do_queue(void *args) {
2080         static time_t last_run = 0L;
2081         struct RoomProcList *ptr;
2082         int full_processing = 1;
2083         struct CitContext networkerCC;
2084
2085         /* Give the networker its own private CitContext */
2086         CtdlFillSystemContext(&networkerCC, "network");
2087         citthread_setspecific(MyConKey, (void *)&networkerCC );
2088
2089         /*
2090          * Run the full set of processing tasks no more frequently
2091          * than once every n seconds
2092          */
2093         if ( (time(NULL) - last_run) < config.c_net_freq ) {
2094                 full_processing = 0;
2095                 CtdlLogPrintf(CTDL_DEBUG, "Network full processing in %ld seconds.\n", config.c_net_freq - (time(NULL)- last_run));
2096         }
2097
2098         /*
2099          * This is a simple concurrency check to make sure only one queue run
2100          * is done at a time.  We could do this with a mutex, but since we
2101          * don't really require extremely fine granularity here, we'll do it
2102          * with a static variable instead.
2103          */
2104         if (doing_queue) return NULL;
2105         doing_queue = 1;
2106
2107         /* Load the IGnet Configuration into memory */
2108         load_working_ignetcfg();
2109
2110         /*
2111          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
2112          * then we poll everyone.  Otherwise we only poll nodes we have stuff
2113          * to send to.
2114          */
2115         network_poll_other_citadel_nodes(full_processing);
2116
2117         /*
2118          * Load the network map and filter list into memory.
2119          */
2120         read_network_map();
2121         filterlist = load_filter_list();
2122
2123         /*
2124          * Go ahead and run the queue
2125          */
2126         if (full_processing && !CtdlThreadCheckStop()) {
2127                 CtdlLogPrintf(CTDL_DEBUG, "network: loading outbound queue\n");
2128                 ForEachRoom(network_queue_room, NULL);
2129         }
2130
2131         if (rplist != NULL) {
2132                 CtdlLogPrintf(CTDL_DEBUG, "network: running outbound queue\n");
2133                 while (rplist != NULL && !CtdlThreadCheckStop()) {
2134                         char spoolroomname[ROOMNAMELEN];
2135                         safestrncpy(spoolroomname, rplist->name, sizeof spoolroomname);
2136                         begin_critical_section(S_RPLIST);
2137
2138                         /* pop this record off the list */
2139                         ptr = rplist;
2140                         rplist = rplist->next;
2141                         free(ptr);
2142
2143                         /* invalidate any duplicate entries to prevent double processing */
2144                         for (ptr=rplist; ptr!=NULL; ptr=ptr->next) {
2145                                 if (!strcasecmp(ptr->name, spoolroomname)) {
2146                                         ptr->name[0] = 0;
2147                                 }
2148                         }
2149
2150                         end_critical_section(S_RPLIST);
2151                         if (spoolroomname[0] != 0) {
2152                                 network_spoolout_room(spoolroomname);
2153                         }
2154                 }
2155         }
2156
2157         /* If there is anything in the inbound queue, process it */
2158         if (!CtdlThreadCheckStop())
2159                 network_do_spoolin();
2160
2161         /* Save the network map back to disk */
2162         write_network_map();
2163
2164         /* Free the filter list in memory */
2165         free_filter_list(filterlist);
2166         filterlist = NULL;
2167
2168         network_purge_spoolout();
2169
2170         CtdlLogPrintf(CTDL_DEBUG, "network: queue run completed\n");
2171
2172         if (full_processing) {
2173                 last_run = time(NULL);
2174         }
2175
2176         doing_queue = 0;
2177         if (!CtdlThreadCheckStop()) // Only reschedule if system is not stopping
2178                 CtdlThreadSchedule("IGnet Network", CTDLTHREAD_BIGSTACK, network_do_queue, NULL, time(NULL) + 60);
2179         else
2180                 CtdlLogPrintf(CTDL_DEBUG, "network: Task STOPPED.\n");
2181         return NULL;
2182 }
2183
2184
2185 /*
2186  * cmd_netp() - authenticate to the server as another Citadel node polling
2187  *            for network traffic
2188  */
2189 void cmd_netp(char *cmdbuf)
2190 {
2191         char node[256];
2192         char pass[256];
2193         int v;
2194
2195         char secret[256];
2196         char nexthop[256];
2197         char err_buf[SIZ];
2198
2199         /* Authenticate */
2200         extract_token(node, cmdbuf, 0, '|', sizeof node);
2201         extract_token(pass, cmdbuf, 1, '|', sizeof pass);
2202
2203         if (doing_queue) {
2204                 CtdlLogPrintf(CTDL_WARNING, "Network node <%s> refused - spooling", node);
2205                 cprintf("%d spooling - try again in a few minutes\n",
2206                         ERROR + RESOURCE_BUSY);
2207                 return;
2208         }
2209
2210         /* load the IGnet Configuration to check node validity */
2211         load_working_ignetcfg();
2212         v = is_valid_node(nexthop, secret, node);
2213
2214         if (v != 0) {
2215                 snprintf (err_buf, sizeof(err_buf), "Unknown node <%s>\n", node);
2216                 CtdlLogPrintf(CTDL_WARNING, err_buf);
2217                 cprintf("%d authentication failed\n",
2218                         ERROR + PASSWORD_REQUIRED);
2219                 aide_message(err_buf, "IGNet Networking.");
2220                 return;
2221         }
2222
2223         if (strcasecmp(pass, secret)) {
2224                 snprintf (err_buf, sizeof(err_buf), "Bad password for network node <%s>", node);
2225                 CtdlLogPrintf(CTDL_WARNING, err_buf);
2226                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2227                 aide_message(err_buf, "IGNet Networking.");
2228                 return;
2229         }
2230
2231         if (network_talking_to(node, NTT_CHECK)) {
2232                 CtdlLogPrintf(CTDL_WARNING, "Duplicate session for network node <%s>", node);
2233                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
2234                 return;
2235         }
2236
2237         safestrncpy(CC->net_node, node, sizeof CC->net_node);
2238         network_talking_to(node, NTT_ADD);
2239         CtdlLogPrintf(CTDL_NOTICE, "Network node <%s> logged in\n", CC->net_node);
2240         cprintf("%d authenticated as network node '%s'\n", CIT_OK,
2241                 CC->net_node);
2242 }
2243
2244 int network_room_handler (struct ctdlroom *room)
2245 {
2246         network_queue_room(room, NULL);
2247         return 0;
2248 }
2249
2250 /*
2251  * Module entry point
2252  */
2253 CTDL_MODULE_INIT(network)
2254 {
2255         if (!threading)
2256         {
2257                 create_spool_dirs();
2258                 CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
2259                 CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
2260                 CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
2261                 CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
2262                 CtdlRegisterRoomHook(network_room_handler);
2263                 CtdlRegisterCleanupHook(destroy_network_queue_room);
2264         }
2265         else
2266                 CtdlThreadSchedule("IGnet Network", CTDLTHREAD_BIGSTACK, network_do_queue, NULL, 0);
2267         /* return our Subversion id for the Log */
2268         return "$Id$";
2269 }