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) 2000-2010 by the citadel.org team
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 3 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  24  * This is a fairly high-level type of critical section.  It ensures that no
  25  * two threads work on the netconfigs files at the same time.  Since we do
  26  * so many things inside these, here are the rules:
  27  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  28  *  2. Do *not* perform any I/O with the client during these sections.
  29  *
  30  */
  31
  32 /*
  33  * Duration of time (in seconds) after which pending list subscribe/unsubscribe
  34  * requests that have not been confirmed will be deleted.
  35  */
  36 #define EXP     259200  /* three days */
  37
  38 #include "sysdep.h"
  39 #include <stdlib.h>
  40 #include <unistd.h>
  41 #include <stdio.h>
  42 #include <fcntl.h>
  43 #include <ctype.h>
  44 #include <signal.h>
  45 #include <pwd.h>
  46 #include <errno.h>
  47 #include <sys/stat.h>
  48 #include <sys/types.h>
  49 #include <dirent.h>
  50 #if TIME_WITH_SYS_TIME
  51 # include <sys/time.h>
  52 # include <time.h>
  53 #else
  54 # if HAVE_SYS_TIME_H
  55 #  include <sys/time.h>
  56 # else
  57 #  include <time.h>
  58 # endif
  59 #endif
  60
  61 #include <sys/wait.h>
  62 #include <string.h>
  63 #include <limits.h>
  64 #include <libcitadel.h>
  65 #include "citadel.h"
  66 #include "server.h"
  67 #include "citserver.h"
  68 #include "support.h"
  69 #include "config.h"
  70 #include "user_ops.h"
  71 #include "policy.h"
  72 #include "database.h"
  73 #include "msgbase.h"
  74 #include "internet_addressing.h"
  75 #include "serv_network.h"
  76 #include "clientsocket.h"
  77 #include "file_ops.h"
  78 #include "citadel_dirs.h"
  79 #include "threads.h"
  80
  81 #ifndef HAVE_SNPRINTF
  82 #include "snprintf.h"
  83 #endif
  84
  85 #include "context.h"
  86
  87 #include "ctdl_module.h"
  88
  89
  90
  91 /* Nonzero while we are doing network processing */
  92 static int doing_queue = 0;
  93
  94 /*
  95  * When we do network processing, it's accomplished in two passes; one to
  96  * gather a list of rooms and one to actually do them.  It's ok that rplist
  97  * is global; we have a mutex that keeps it safe.
  98  */
  99 struct RoomProcList *rplist = NULL;
 100
 101 /*
 102  * We build a map of network nodes during processing.
 103  */
 104 NetMap *the_netmap = NULL;
 105 int netmap_changed = 0;
 106 char *working_ignetcfg = NULL;
 107
 108 /*
 109  * Load or refresh the Citadel network (IGnet) configuration for this node.
 110  */
 111 void load_working_ignetcfg(void) {
 112         char *cfg;
 113         char *oldcfg;
 114
 115         cfg = CtdlGetSysConfig(IGNETCFG);
 116         if (cfg == NULL) {
 117                 cfg = strdup("");
 118         }
 119
 120         oldcfg = working_ignetcfg;
 121         working_ignetcfg = cfg;
 122         if (oldcfg != NULL) {
 123                 free(oldcfg);
 124         }
 125 }
 126
 127
 128
 129
 130
 131 /*
 132  * Keep track of what messages to reject
 133  */
 134 FilterList *load_filter_list(void) {
 135         char *serialized_list = NULL;
 136         int i;
 137         char buf[SIZ];
 138         FilterList *newlist = NULL;
 139         FilterList *nptr;
 140
 141         serialized_list = CtdlGetSysConfig(FILTERLIST);
 142         if (serialized_list == NULL) return(NULL); /* if null, no entries */
 143
 144         /* Use the string tokenizer to grab one line at a time */
 145         for (i=0; i<num_tokens(serialized_list, '\n'); ++i) {
 146                 extract_token(buf, serialized_list, i, '\n', sizeof buf);
 147                 nptr = (FilterList *) malloc(sizeof(FilterList));
 148                 extract_token(nptr->fl_user, buf, 0, '|', sizeof nptr->fl_user);
 149                 striplt(nptr->fl_user);
 150                 extract_token(nptr->fl_room, buf, 1, '|', sizeof nptr->fl_room);
 151                 striplt(nptr->fl_room);
 152                 extract_token(nptr->fl_node, buf, 2, '|', sizeof nptr->fl_node);
 153                 striplt(nptr->fl_node);
 154
 155                 /* Cowardly refuse to add an any/any/any entry that would
 156                  * end up filtering every single message.
 157                  */
 158                 if (IsEmptyStr(nptr->fl_user) &&
 159                     IsEmptyStr(nptr->fl_room) &&
 160                     IsEmptyStr(nptr->fl_node)) {
 161                         free(nptr);
 162                 }
 163                 else {
 164                         nptr->next = newlist;
 165                         newlist = nptr;
 166                 }
 167         }
 168
 169         free(serialized_list);
 170         return newlist;
 171 }
 172
 173
 174 void free_filter_list(FilterList *fl) {
 175         if (fl == NULL) return;
 176         free_filter_list(fl->next);
 177         free(fl);
 178 }
 179
 180
 181
 182 /*
 183  * Check the use table.  This is a list of messages which have recently
 184  * arrived on the system.  It is maintained and queried to prevent the same
 185  * message from being entered into the database multiple times if it happens
 186  * to arrive multiple times by accident.
 187  */
 188 int network_usetable(struct CtdlMessage *msg) {
 189
 190         char msgid[SIZ];
 191         struct cdbdata *cdbut;
 192         struct UseTable ut;
 193
 194         /* Bail out if we can't generate a message ID */
 195         if (msg == NULL) {
 196                 return(0);
 197         }
 198         if (msg->cm_fields['I'] == NULL) {
 199                 return(0);
 200         }
 201         if (IsEmptyStr(msg->cm_fields['I'])) {
 202                 return(0);
 203         }
 204
 205         /* Generate the message ID */
 206         strcpy(msgid, msg->cm_fields['I']);
 207         if (haschar(msgid, '@') == 0) {
 208                 strcat(msgid, "@");
 209                 if (msg->cm_fields['N'] != NULL) {
 210                         strcat(msgid, msg->cm_fields['N']);
 211                 }
 212                 else {
 213                         return(0);
 214                 }
 215         }
 216
 217         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 218         if (cdbut != NULL) {
 219                 cdb_free(cdbut);
 220                 CtdlLogPrintf(CTDL_DEBUG, "network_usetable() : we already have %s\n", msgid);
 221                 return(1);
 222         }
 223
 224         /* If we got to this point, it's unique: add it. */
 225         strcpy(ut.ut_msgid, msgid);
 226         ut.ut_timestamp = time(NULL);
 227         cdb_store(CDB_USETABLE, msgid, strlen(msgid), &ut, sizeof(struct UseTable) );
 228         return(0);
 229 }
 230
 231
 232 /*
 233  * Read the network map from its configuration file into memory.
 234  */
 235 void read_network_map(void) {
 236         char *serialized_map = NULL;
 237         int i;
 238         char buf[SIZ];
 239         NetMap *nmptr;
 240
 241         serialized_map = CtdlGetSysConfig(IGNETMAP);
 242         if (serialized_map == NULL) return;     /* if null, no entries */
 243
 244         /* Use the string tokenizer to grab one line at a time */
 245         for (i=0; i<num_tokens(serialized_map, '\n'); ++i) {
 246                 extract_token(buf, serialized_map, i, '\n', sizeof buf);
 247                 nmptr = (NetMap *) malloc(sizeof(NetMap));
 248                 extract_token(nmptr->nodename, buf, 0, '|', sizeof nmptr->nodename);
 249                 nmptr->lastcontact = extract_long(buf, 1);
 250                 extract_token(nmptr->nexthop, buf, 2, '|', sizeof nmptr->nexthop);
 251                 nmptr->next = the_netmap;
 252                 the_netmap = nmptr;
 253         }
 254
 255         free(serialized_map);
 256         netmap_changed = 0;
 257 }
 258
 259
 260 /*
 261  * Write the network map from memory back to the configuration file.
 262  */
 263 void write_network_map(void) {
 264         char *serialized_map = NULL;
 265         NetMap *nmptr;
 266
 267
 268         if (netmap_changed) {
 269                 serialized_map = strdup("");
 270
 271                 if (the_netmap != NULL) {
 272                         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 273                                 serialized_map = realloc(serialized_map,
 274                                                         (strlen(serialized_map)+SIZ) );
 275                                 if (!IsEmptyStr(nmptr->nodename)) {
 276                                         snprintf(&serialized_map[strlen(serialized_map)],
 277                                                 SIZ,
 278                                                 "%s|%ld|%s\n",
 279                                                 nmptr->nodename,
 280                                                 (long)nmptr->lastcontact,
 281                                                 nmptr->nexthop);
 282                                 }
 283                         }
 284                 }
 285
 286                 CtdlPutSysConfig(IGNETMAP, serialized_map);
 287                 free(serialized_map);
 288         }
 289
 290         /* Now free the list */
 291         while (the_netmap != NULL) {
 292                 nmptr = the_netmap->next;
 293                 free(the_netmap);
 294                 the_netmap = nmptr;
 295         }
 296         netmap_changed = 0;
 297 }
 298
 299
 300
 301 /*
 302  * Check the network map and determine whether the supplied node name is
 303  * valid.  If it is not a neighbor node, supply the name of a neighbor node
 304  * which is the next hop.  If it *is* a neighbor node, we also fill in the
 305  * shared secret.
 306  */
 307 int is_valid_node(char *nexthop, char *secret, char *node) {
 308         int i;
 309         char linebuf[SIZ];
 310         char buf[SIZ];
 311         int retval;
 312         NetMap *nmptr;
 313
 314         if (node == NULL) {
 315                 return(-1);
 316         }
 317
 318         /*
 319          * First try the neighbor nodes
 320          */
 321         if (working_ignetcfg == NULL) {
 322                 CtdlLogPrintf(CTDL_ERR, "working_ignetcfg is NULL!\n");
 323                 if (nexthop != NULL) {
 324                         strcpy(nexthop, "");
 325                 }
 326                 return(-1);
 327         }
 328
 329         retval = (-1);
 330         if (nexthop != NULL) {
 331                 strcpy(nexthop, "");
 332         }
 333
 334         /* Use the string tokenizer to grab one line at a time */
 335         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
 336                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
 337                 extract_token(buf, linebuf, 0, '|', sizeof buf);
 338                 if (!strcasecmp(buf, node)) {
 339                         if (nexthop != NULL) {
 340                                 strcpy(nexthop, "");
 341                         }
 342                         if (secret != NULL) {
 343                                 extract_token(secret, linebuf, 1, '|', 256);
 344                         }
 345                         retval = 0;
 346                 }
 347         }
 348
 349         if (retval == 0) {
 350                 return(retval);         /* yup, it's a direct neighbor */
 351         }
 352
 353         /*
 354          * If we get to this point we have to see if we know the next hop
 355          */
 356         if (the_netmap != NULL) {
 357                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 358                         if (!strcasecmp(nmptr->nodename, node)) {
 359                                 if (nexthop != NULL) {
 360                                         strcpy(nexthop, nmptr->nexthop);
 361                                 }
 362                                 return(0);
 363                         }
 364                 }
 365         }
 366
 367         /*
 368          * If we get to this point, the supplied node name is bogus.
 369          */
 370         CtdlLogPrintf(CTDL_ERR, "Invalid node name <%s>\n", node);
 371         return(-1);
 372 }
 373
 374
 375
 376
 377
 378 void cmd_gnet(char *argbuf) {
 379         char filename[PATH_MAX];
 380         char buf[SIZ];
 381         FILE *fp;
 382
 383         if ( (CC->room.QRflags & QR_MAILBOX) && (CC->user.usernum == atol(CC->room.QRname)) ) {
 384                 /* users can edit the netconfigs for their own mailbox rooms */
 385         }
 386         else if (CtdlAccessCheck(ac_room_aide)) return;
 387
 388         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 389         cprintf("%d Network settings for room #%ld <%s>\n",
 390                 LISTING_FOLLOWS,
 391                 CC->room.QRnumber, CC->room.QRname);
 392
 393         fp = fopen(filename, "r");
 394         if (fp != NULL) {
 395                 while (fgets(buf, sizeof buf, fp) != NULL) {
 396                         buf[strlen(buf)-1] = 0;
 397                         cprintf("%s\n", buf);
 398                 }
 399                 fclose(fp);
 400         }
 401
 402         cprintf("000\n");
 403 }
 404
 405
 406 void cmd_snet(char *argbuf) {
 407         char tempfilename[PATH_MAX];
 408         char filename[PATH_MAX];
 409         char buf[SIZ];
 410         FILE *fp, *newfp;
 411
 412         unbuffer_output();
 413
 414         if ( (CC->room.QRflags & QR_MAILBOX) && (CC->user.usernum == atol(CC->room.QRname)) ) {
 415                 /* users can edit the netconfigs for their own mailbox rooms */
 416         }
 417         else if (CtdlAccessCheck(ac_room_aide)) return;
 418
 419         CtdlMakeTempFileName(tempfilename, sizeof tempfilename);
 420         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 421
 422         fp = fopen(tempfilename, "w");
 423         if (fp == NULL) {
 424                 cprintf("%d Cannot open %s: %s\n",
 425                         ERROR + INTERNAL_ERROR,
 426                         tempfilename,
 427                         strerror(errno));
 428         }
 429
 430         cprintf("%d %s\n", SEND_LISTING, tempfilename);
 431         while (client_getln(buf, sizeof buf) >= 0 && strcmp(buf, "000")) {
 432                 fprintf(fp, "%s\n", buf);
 433         }
 434         fclose(fp);
 435
 436         /* Now copy the temp file to its permanent location.
 437          * (We copy instead of link because they may be on different filesystems)
 438          */
 439         begin_critical_section(S_NETCONFIGS);
 440         fp = fopen(tempfilename, "r");
 441         if (fp != NULL) {
 442                 newfp = fopen(filename, "w");
 443                 if (newfp != NULL) {
 444                         while (fgets(buf, sizeof buf, fp) != NULL) {
 445                                 fprintf(newfp, "%s", buf);
 446                         }
 447                         fclose(newfp);
 448                 }
 449                 fclose(fp);
 450         }
 451         end_critical_section(S_NETCONFIGS);
 452         unlink(tempfilename);
 453 }
 454
 455
 456 /*
 457  * Deliver digest messages
 458  */
 459 void network_deliver_digest(SpoolControl *sc) {
 460         char buf[SIZ];
 461         int i;
 462         struct CtdlMessage *msg = NULL;
 463         long msglen;
 464         char *recps = NULL;
 465         size_t recps_len = SIZ;
 466         size_t siz;
 467         struct recptypes *valid;
 468         namelist *nptr;
 469         char bounce_to[256];
 470
 471         if (sc->num_msgs_spooled < 1) {
 472                 fclose(sc->digestfp);
 473                 sc->digestfp = NULL;
 474                 return;
 475         }
 476
 477         msg = malloc(sizeof(struct CtdlMessage));
 478         memset(msg, 0, sizeof(struct CtdlMessage));
 479         msg->cm_magic = CTDLMESSAGE_MAGIC;
 480         msg->cm_format_type = FMT_RFC822;
 481         msg->cm_anon_type = MES_NORMAL;
 482
 483         sprintf(buf, "%ld", time(NULL));
 484         msg->cm_fields['T'] = strdup(buf);
 485         msg->cm_fields['A'] = strdup(CC->room.QRname);
 486         snprintf(buf, sizeof buf, "[%s]", CC->room.QRname);
 487         msg->cm_fields['U'] = strdup(buf);
 488         sprintf(buf, "room_%s@%s", CC->room.QRname, config.c_fqdn);
 489         for (i=0; buf[i]; ++i) {
 490                 if (isspace(buf[i])) buf[i]='_';
 491                 buf[i] = tolower(buf[i]);
 492         }
 493         msg->cm_fields['F'] = strdup(buf);
 494         msg->cm_fields['R'] = strdup(buf);
 495
 496         /* Set the 'List-ID' header */
 497         msg->cm_fields['L'] = malloc(1024);
 498         snprintf(msg->cm_fields['L'], 1024,
 499                 "%s <%ld.list-id.%s>",
 500                 CC->room.QRname,
 501                 CC->room.QRnumber,
 502                 config.c_fqdn
 503         );
 504
 505         /*
 506          * Go fetch the contents of the digest
 507          */
 508         fseek(sc->digestfp, 0L, SEEK_END);
 509         msglen = ftell(sc->digestfp);
 510
 511         msg->cm_fields['M'] = malloc(msglen + 1);
 512         fseek(sc->digestfp, 0L, SEEK_SET);
 513         siz = fread(msg->cm_fields['M'], (size_t)msglen, 1, sc->digestfp);
 514         msg->cm_fields['M'][msglen] = '\0';
 515
 516         fclose(sc->digestfp);
 517         sc->digestfp = NULL;
 518
 519         /* Now generate the delivery instructions */
 520
 521         /*
 522          * Figure out how big a buffer we need to allocate
 523          */
 524         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 525                 recps_len = recps_len + strlen(nptr->name) + 2;
 526         }
 527
 528         recps = malloc(recps_len);
 529
 530         if (recps == NULL) {
 531                 CtdlLogPrintf(CTDL_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 532                 abort();
 533         }
 534
 535         strcpy(recps, "");
 536
 537         /* Each recipient */
 538         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 539                 if (nptr != sc->digestrecps) {
 540                         strcat(recps, ",");
 541                 }
 542                 strcat(recps, nptr->name);
 543         }
 544
 545         /* Where do we want bounces and other noise to be heard?  Surely not the list members! */
 546         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 547
 548         /* Now submit the message */
 549         valid = validate_recipients(recps, NULL, 0);
 550         free(recps);
 551         if (valid != NULL) {
 552                 valid->bounce_to = strdup(bounce_to);
 553                 valid->envelope_from = strdup(bounce_to);
 554                 CtdlSubmitMsg(msg, valid, NULL, 0);
 555         }
 556         CtdlFreeMessage(msg);
 557         free_recipients(valid);
 558 }
 559
 560
 561 /*
 562  * Deliver list messages to everyone on the list ... efficiently
 563  */
 564 void network_deliver_list(struct CtdlMessage *msg, SpoolControl *sc) {
 565         char *recps = NULL;
 566         size_t recps_len = SIZ;
 567         struct recptypes *valid;
 568         namelist *nptr;
 569         char bounce_to[256];
 570
 571         /* Don't do this if there were no recipients! */
 572         if (sc->listrecps == NULL) return;
 573
 574         /* Now generate the delivery instructions */
 575
 576         /*
 577          * Figure out how big a buffer we need to allocate
 578          */
 579         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 580                 recps_len = recps_len + strlen(nptr->name) + 2;
 581         }
 582
 583         recps = malloc(recps_len);
 584
 585         if (recps == NULL) {
 586                 CtdlLogPrintf(CTDL_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 587                 abort();
 588         }
 589
 590         strcpy(recps, "");
 591
 592         /* Each recipient */
 593         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 594                 if (nptr != sc->listrecps) {
 595                         strcat(recps, ",");
 596                 }
 597                 strcat(recps, nptr->name);
 598         }
 599
 600         /* Where do we want bounces and other noise to be heard?  Surely not the list members! */
 601         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 602
 603         /* Now submit the message */
 604         valid = validate_recipients(recps, NULL, 0);
 605         free(recps);
 606         if (valid != NULL) {
 607                 valid->bounce_to = strdup(bounce_to);
 608                 valid->envelope_from = strdup(bounce_to);
 609                 CtdlSubmitMsg(msg, valid, NULL, 0);
 610                 free_recipients(valid);
 611         }
 612         /* Do not call CtdlFreeMessage(msg) here; the caller will free it. */
 613 }
 614
 615
 616
 617
 618 /*
 619  * Spools out one message from the list.
 620  */
 621 void network_spool_msg(long msgnum, void *userdata) {
 622         SpoolControl *sc;
 623         int i;
 624         char *newpath = NULL;
 625         size_t instr_len = SIZ;
 626         struct CtdlMessage *msg = NULL;
 627         namelist *nptr;
 628         maplist *mptr;
 629         struct ser_ret sermsg;
 630         FILE *fp;
 631         char filename[PATH_MAX];
 632         char buf[SIZ];
 633         int bang = 0;
 634         int send = 1;
 635         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 636         int ok_to_participate = 0;
 637         struct recptypes *valid;
 638
 639         sc = (SpoolControl *)userdata;
 640
 641         /*
 642          * Process mailing list recipients
 643          */
 644         instr_len = SIZ;
 645         if (sc->listrecps != NULL) {
 646                 /* Fetch the message.  We're going to need to modify it
 647                  * in order to insert the [list name] in it, etc.
 648                  */
 649                 msg = CtdlFetchMessage(msgnum, 1);
 650                 if (msg != NULL) {
 651
 652                         /* Set the 'List-ID' header */
 653                         if (msg->cm_fields['L'] != NULL) {
 654                                 free(msg->cm_fields['L']);
 655                         }
 656                         msg->cm_fields['L'] = malloc(1024);
 657                         snprintf(msg->cm_fields['L'], 1024,
 658                                 "%s <%ld.list-id.%s>",
 659                                 CC->room.QRname,
 660                                 CC->room.QRnumber,
 661                                 config.c_fqdn
 662                         );
 663
 664                         /* Prepend "[List name]" to the subject */
 665                         if (msg->cm_fields['U'] == NULL) {
 666                                 msg->cm_fields['U'] = strdup("(no subject)");
 667                         }
 668                         snprintf(buf, sizeof buf, "[%s] %s", CC->room.QRname, msg->cm_fields['U']);
 669                         free(msg->cm_fields['U']);
 670                         msg->cm_fields['U'] = strdup(buf);
 671
 672                         /* Set the recipient of the list message to the
 673                          * email address of the room itself.
 674                          * FIXME ... I want to be able to pick any address
 675                          */
 676                         if (msg->cm_fields['R'] != NULL) {
 677                                 free(msg->cm_fields['R']);
 678                         }
 679                         msg->cm_fields['R'] = malloc(256);
 680                         snprintf(msg->cm_fields['R'], 256,
 681                                 "room_%s@%s", CC->room.QRname,
 682                                 config.c_fqdn);
 683                         for (i=0; msg->cm_fields['R'][i]; ++i) {
 684                                 if (isspace(msg->cm_fields['R'][i])) {
 685                                         msg->cm_fields['R'][i] = '_';
 686                                 }
 687                         }
 688
 689                         /* Handle delivery */
 690                         network_deliver_list(msg, sc);
 691                         CtdlFreeMessage(msg);
 692                 }
 693         }
 694
 695         /*
 696          * Process digest recipients
 697          */
 698         if ((sc->digestrecps != NULL) && (sc->digestfp != NULL)) {
 699                 msg = CtdlFetchMessage(msgnum, 1);
 700                 if (msg != NULL) {
 701                         fprintf(sc->digestfp,   " -----------------------------------"
 702                                                 "------------------------------------"
 703                                                 "-------\n");
 704                         fprintf(sc->digestfp, "From: ");
 705                         if (msg->cm_fields['A'] != NULL) {
 706                                 fprintf(sc->digestfp, "%s ", msg->cm_fields['A']);
 707                         }
 708                         if (msg->cm_fields['F'] != NULL) {
 709                                 fprintf(sc->digestfp, "<%s> ", msg->cm_fields['F']);
 710                         }
 711                         else if (msg->cm_fields['N'] != NULL) {
 712                                 fprintf(sc->digestfp, "@%s ", msg->cm_fields['N']);
 713                         }
 714                         fprintf(sc->digestfp, "\n");
 715                         if (msg->cm_fields['U'] != NULL) {
 716                                 fprintf(sc->digestfp, "Subject: %s\n", msg->cm_fields['U']);
 717                         }
 718
 719                         CC->redirect_buffer = malloc(SIZ);
 720                         CC->redirect_len = 0;
 721                         CC->redirect_alloc = SIZ;
 722
 723                         safestrncpy(CC->preferred_formats, "text/plain", sizeof CC->preferred_formats);
 724                         CtdlOutputPreLoadedMsg(msg, MT_CITADEL, HEADERS_NONE, 0, 0, 0);
 725
 726                         striplt(CC->redirect_buffer);
 727                         fprintf(sc->digestfp, "\n%s\n", CC->redirect_buffer);
 728
 729                         free(CC->redirect_buffer);
 730                         CC->redirect_buffer = NULL;
 731                         CC->redirect_len = 0;
 732                         CC->redirect_alloc = 0;
 733
 734                         sc->num_msgs_spooled += 1;
 735                         free(msg);
 736                 }
 737         }
 738
 739         /*
 740          * Process client-side list participations for this room
 741          */
 742         instr_len = SIZ;
 743         if (sc->participates != NULL) {
 744                 msg = CtdlFetchMessage(msgnum, 1);
 745                 if (msg != NULL) {
 746
 747                         /* Only send messages which originated on our own Citadel
 748                          * network, otherwise we'll end up sending the remote
 749                          * mailing list's messages back to it, which is rude...
 750                          */
 751                         ok_to_participate = 0;
 752                         if (msg->cm_fields['N'] != NULL) {
 753                                 if (!strcasecmp(msg->cm_fields['N'], config.c_nodename)) {
 754                                         ok_to_participate = 1;
 755                                 }
 756                                 if (is_valid_node(NULL, NULL, msg->cm_fields['N']) == 0) {
 757                                         ok_to_participate = 1;
 758                                 }
 759                         }
 760                         if (ok_to_participate) {
 761                                 if (msg->cm_fields['F'] != NULL) {
 762                                         free(msg->cm_fields['F']);
 763                                 }
 764                                 msg->cm_fields['F'] = malloc(SIZ);
 765                                 /* Replace the Internet email address of the actual
 766                                 * author with the email address of the room itself,
 767                                 * so the remote listserv doesn't reject us.
 768                                 * FIXME ... I want to be able to pick any address
 769                                 */
 770                                 snprintf(msg->cm_fields['F'], SIZ,
 771                                         "room_%s@%s", CC->room.QRname,
 772                                         config.c_fqdn);
 773                                 for (i=0; msg->cm_fields['F'][i]; ++i) {
 774                                         if (isspace(msg->cm_fields['F'][i])) {
 775                                                 msg->cm_fields['F'][i] = '_';
 776                                         }
 777                                 }
 778
 779                                 /*
 780                                  * Figure out how big a buffer we need to allocate
 781                                  */
 782                                 for (nptr = sc->participates; nptr != NULL; nptr = nptr->next) {
 783
 784                                         if (msg->cm_fields['R'] == NULL) {
 785                                                 free(msg->cm_fields['R']);
 786                                         }
 787                                         msg->cm_fields['R'] = strdup(nptr->name);
 788
 789                                         valid = validate_recipients(nptr->name, NULL, 0);
 790                                         CtdlSubmitMsg(msg, valid, "", 0);
 791                                         free_recipients(valid);
 792                                 }
 793
 794                         }
 795                         CtdlFreeMessage(msg);
 796                 }
 797         }
 798
 799         /*
 800          * Process IGnet push shares
 801          */
 802         msg = CtdlFetchMessage(msgnum, 1);
 803         if (msg != NULL) {
 804                 size_t newpath_len;
 805
 806                 /* Prepend our node name to the Path field whenever
 807                  * sending a message to another IGnet node
 808                  */
 809                 if (msg->cm_fields['P'] == NULL) {
 810                         msg->cm_fields['P'] = strdup("username");
 811                 }
 812                 newpath_len = strlen(msg->cm_fields['P']) +
 813                          strlen(config.c_nodename) + 2;
 814                 newpath = malloc(newpath_len);
 815                 snprintf(newpath, newpath_len, "%s!%s",
 816                          config.c_nodename, msg->cm_fields['P']);
 817                 free(msg->cm_fields['P']);
 818                 msg->cm_fields['P'] = newpath;
 819
 820                 /*
 821                  * Determine if this message is set to be deleted
 822                  * after sending out on the network
 823                  */
 824                 if (msg->cm_fields['S'] != NULL) {
 825                         if (!strcasecmp(msg->cm_fields['S'], "CANCEL")) {
 826                                 delete_after_send = 1;
 827                         }
 828                 }
 829
 830                 /* Now send it to every node */
 831                 if (sc->ignet_push_shares != NULL)
 832                   for (mptr = sc->ignet_push_shares; mptr != NULL;
 833                     mptr = mptr->next) {
 834
 835                         send = 1;
 836
 837                         /* Check for valid node name */
 838                         if (is_valid_node(NULL, NULL, mptr->remote_nodename) != 0) {
 839                                 CtdlLogPrintf(CTDL_ERR, "Invalid node <%s>\n", mptr->remote_nodename);
 840                                 send = 0;
 841                         }
 842
 843                         /* Check for split horizon */
 844                         CtdlLogPrintf(CTDL_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 845                         bang = num_tokens(msg->cm_fields['P'], '!');
 846                         if (bang > 1) for (i=0; i<(bang-1); ++i) {
 847                                 extract_token(buf, msg->cm_fields['P'], i, '!', sizeof buf);
 848                                 CtdlLogPrintf(CTDL_DEBUG, "Compare <%s> to <%s>\n",
 849                                         buf, mptr->remote_nodename) ;
 850                                 if (!strcasecmp(buf, mptr->remote_nodename)) {
 851                                         send = 0;
 852                                         CtdlLogPrintf(CTDL_DEBUG, "Not sending to %s\n",
 853                                                 mptr->remote_nodename);
 854                                 }
 855                                 else {
 856                                         CtdlLogPrintf(CTDL_DEBUG, "Sending to %s\n", mptr->remote_nodename);
 857                                 }
 858                         }
 859
 860                         /* Send the message */
 861                         if (send == 1) {
 862
 863                                 /*
 864                                  * Force the message to appear in the correct room
 865                                  * on the far end by setting the C field correctly
 866                                  */
 867                                 if (msg->cm_fields['C'] != NULL) {
 868                                         free(msg->cm_fields['C']);
 869                                 }
 870                                 if (!IsEmptyStr(mptr->remote_roomname)) {
 871                                         msg->cm_fields['C'] = strdup(mptr->remote_roomname);
 872                                 }
 873                                 else {
 874                                         msg->cm_fields['C'] = strdup(CC->room.QRname);
 875                                 }
 876
 877                                 /* serialize it for transmission */
 878                                 serialize_message(&sermsg, msg);
 879                                 if (sermsg.len > 0) {
 880
 881                                         /* write it to the spool file */
 882                                         snprintf(filename, sizeof filename,"%s/%s",
 883                                                         ctdl_netout_dir,
 884                                                         mptr->remote_nodename);
 885                                         CtdlLogPrintf(CTDL_DEBUG, "Appending to %s\n", filename);
 886                                         fp = fopen(filename, "ab");
 887                                         if (fp != NULL) {
 888                                                 fwrite(sermsg.ser,
 889                                                         sermsg.len, 1, fp);
 890                                                 fclose(fp);
 891                                         }
 892                                         else {
 893                                                 CtdlLogPrintf(CTDL_ERR, "%s: %s\n", filename, strerror(errno));
 894                                         }
 895
 896                                         /* free the serialized version */
 897                                         free(sermsg.ser);
 898                                 }
 899
 900                         }
 901                 }
 902                 CtdlFreeMessage(msg);
 903         }
 904
 905         /* update lastsent */
 906         sc->lastsent = msgnum;
 907
 908         /* Delete this message if delete-after-send is set */
 909         if (delete_after_send) {
 910                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 911         }
 912
 913 }
 914
 915
 916 int read_spoolcontrol_file(SpoolControl **scc, char *filename)
 917 {
 918         FILE *fp;
 919         char instr[SIZ];
 920         char buf[SIZ];
 921         char nodename[256];
 922         char roomname[ROOMNAMELEN];
 923         size_t miscsize = 0;
 924         size_t linesize = 0;
 925         int skipthisline = 0;
 926         namelist *nptr = NULL;
 927         maplist *mptr = NULL;
 928         SpoolControl *sc;
 929
 930         fp = fopen(filename, "r");
 931         if (fp == NULL) {
 932                 return 0;
 933         }
 934         sc = malloc(sizeof(SpoolControl));
 935         memset(sc, 0, sizeof(SpoolControl));
 936         *scc = sc;
 937
 938         while (fgets(buf, sizeof buf, fp) != NULL) {
 939                 buf[strlen(buf)-1] = 0;
 940
 941                 extract_token(instr, buf, 0, '|', sizeof instr);
 942                 if (!strcasecmp(instr, "lastsent")) {
 943                         sc->lastsent = extract_long(buf, 1);
 944                 }
 945                 else if (!strcasecmp(instr, "listrecp")) {
 946                         nptr = (namelist *)
 947                                 malloc(sizeof(namelist));
 948                         nptr->next = sc->listrecps;
 949                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 950                         sc->listrecps = nptr;
 951                 }
 952                 else if (!strcasecmp(instr, "participate")) {
 953                         nptr = (namelist *)
 954                                 malloc(sizeof(namelist));
 955                         nptr->next = sc->participates;
 956                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 957                         sc->participates = nptr;
 958                 }
 959                 else if (!strcasecmp(instr, "digestrecp")) {
 960                         nptr = (namelist *)
 961                                 malloc(sizeof(namelist));
 962                         nptr->next = sc->digestrecps;
 963                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 964                         sc->digestrecps = nptr;
 965                 }
 966                 else if (!strcasecmp(instr, "ignet_push_share")) {
 967                         extract_token(nodename, buf, 1, '|', sizeof nodename);
 968                         extract_token(roomname, buf, 2, '|', sizeof roomname);
 969                         mptr = (maplist *) malloc(sizeof(maplist));
 970                         mptr->next = sc->ignet_push_shares;
 971                         strcpy(mptr->remote_nodename, nodename);
 972                         strcpy(mptr->remote_roomname, roomname);
 973                         sc->ignet_push_shares = mptr;
 974                 }
 975                 else {
 976                         /* Preserve 'other' lines ... *unless* they happen to
 977                          * be subscribe/unsubscribe pendings with expired
 978                          * timestamps.
 979                          */
 980                         skipthisline = 0;
 981                         if (!strncasecmp(buf, "subpending|", 11)) {
 982                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
 983                                         skipthisline = 1;
 984                                 }
 985                         }
 986                         if (!strncasecmp(buf, "unsubpending|", 13)) {
 987                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
 988                                         skipthisline = 1;
 989                                 }
 990                         }
 991
 992                         if (skipthisline == 0) {
 993                                 linesize = strlen(buf);
 994                                 sc->misc = realloc(sc->misc,
 995                                         (miscsize + linesize + 2) );
 996                                 sprintf(&sc->misc[miscsize], "%s\n", buf);
 997                                 miscsize = miscsize + linesize + 1;
 998                         }
 999                 }
1000
1001
1002         }
1003         fclose(fp);
1004         return 1;
1005 }
1006
1007 void free_spoolcontrol_struct(SpoolControl **scc)
1008 {
1009         SpoolControl *sc;
1010         namelist *nptr = NULL;
1011         maplist *mptr = NULL;
1012
1013         sc = *scc;
1014         while (sc->listrecps != NULL) {
1015                 nptr = sc->listrecps->next;
1016                 free(sc->listrecps);
1017                 sc->listrecps = nptr;
1018         }
1019         /* Do the same for digestrecps */
1020         while (sc->digestrecps != NULL) {
1021                 nptr = sc->digestrecps->next;
1022                 free(sc->digestrecps);
1023                 sc->digestrecps = nptr;
1024         }
1025         /* Do the same for participates */
1026         while (sc->participates != NULL) {
1027                 nptr = sc->participates->next;
1028                 free(sc->participates);
1029                 sc->participates = nptr;
1030         }
1031         while (sc->ignet_push_shares != NULL) {
1032                 mptr = sc->ignet_push_shares->next;
1033                 free(sc->ignet_push_shares);
1034                 sc->ignet_push_shares = mptr;
1035         }
1036         free(sc->misc);
1037         free(sc);
1038         *scc=NULL;
1039 }
1040
1041 int writenfree_spoolcontrol_file(SpoolControl **scc, char *filename)
1042 {
1043         FILE *fp;
1044         SpoolControl *sc;
1045         namelist *nptr = NULL;
1046         maplist *mptr = NULL;
1047
1048         sc = *scc;
1049         fp = fopen(filename, "w");
1050         if (fp == NULL) {
1051                 CtdlLogPrintf(CTDL_CRIT, "ERROR: cannot open %s: %s\n",
1052                         filename, strerror(errno));
1053                 free_spoolcontrol_struct(scc);
1054         }
1055         else {
1056                 fprintf(fp, "lastsent|%ld\n", sc->lastsent);
1057
1058                 /* Write out the listrecps while freeing from memory at the
1059                  * same time.  Am I clever or what?  :)
1060                  */
1061                 while (sc->listrecps != NULL) {
1062                         fprintf(fp, "listrecp|%s\n", sc->listrecps->name);
1063                         nptr = sc->listrecps->next;
1064                         free(sc->listrecps);
1065                         sc->listrecps = nptr;
1066                 }
1067                 /* Do the same for digestrecps */
1068                 while (sc->digestrecps != NULL) {
1069                         fprintf(fp, "digestrecp|%s\n", sc->digestrecps->name);
1070                         nptr = sc->digestrecps->next;
1071                         free(sc->digestrecps);
1072                         sc->digestrecps = nptr;
1073                 }
1074                 /* Do the same for participates */
1075                 while (sc->participates != NULL) {
1076                         fprintf(fp, "participate|%s\n", sc->participates->name);
1077                         nptr = sc->participates->next;
1078                         free(sc->participates);
1079                         sc->participates = nptr;
1080                 }
1081                 while (sc->ignet_push_shares != NULL) {
1082                         fprintf(fp, "ignet_push_share|%s", sc->ignet_push_shares->remote_nodename);
1083                         if (!IsEmptyStr(sc->ignet_push_shares->remote_roomname)) {
1084                                 fprintf(fp, "|%s", sc->ignet_push_shares->remote_roomname);
1085                         }
1086                         fprintf(fp, "\n");
1087                         mptr = sc->ignet_push_shares->next;
1088                         free(sc->ignet_push_shares);
1089                         sc->ignet_push_shares = mptr;
1090                 }
1091                 if (sc->misc != NULL) {
1092                         fwrite(sc->misc, strlen(sc->misc), 1, fp);
1093                 }
1094                 free(sc->misc);
1095
1096                 fclose(fp);
1097                 free(sc);
1098                 *scc=NULL;
1099         }
1100         return 1;
1101 }
1102 int is_recipient(SpoolControl *sc, const char *Name)
1103 {
1104         namelist *nptr;
1105         size_t len;
1106
1107         len = strlen(Name);
1108         nptr = sc->listrecps;
1109         while (nptr != NULL) {
1110                 if (strncmp(Name, nptr->name, len)==0)
1111                         return 1;
1112                 nptr = nptr->next;
1113         }
1114         /* Do the same for digestrecps */
1115         nptr = sc->digestrecps;
1116         while (nptr != NULL) {
1117                 if (strncmp(Name, nptr->name, len)==0)
1118                         return 1;
1119                 nptr = nptr->next;
1120         }
1121         /* Do the same for participates */
1122         nptr = sc->participates;
1123         while (nptr != NULL) {
1124                 if (strncmp(Name, nptr->name, len)==0)
1125                         return 1;
1126                 nptr = nptr->next;
1127         }
1128         return 0;
1129 }
1130
1131
1132 /*
1133  * Batch up and send all outbound traffic from the current room
1134  */
1135 void network_spoolout_room(char *room_to_spool) {
1136         char buf[SIZ];
1137         char filename[PATH_MAX];
1138         SpoolControl *sc;
1139         int i;
1140
1141         /*
1142          * If the room doesn't exist, don't try to perform its networking tasks.
1143          * Normally this should never happen, but once in a while maybe a room gets
1144          * queued for networking and then deleted before it can happen.
1145          */
1146         if (CtdlGetRoom(&CC->room, room_to_spool) != 0) {
1147                 CtdlLogPrintf(CTDL_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
1148                 return;
1149         }
1150
1151         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1152         begin_critical_section(S_NETCONFIGS);
1153
1154         /* Only do net processing for rooms that have netconfigs */
1155         if (!read_spoolcontrol_file(&sc, filename))
1156         {
1157                 end_critical_section(S_NETCONFIGS);
1158                 return;
1159         }
1160         CtdlLogPrintf(CTDL_INFO, "Networking started for <%s>\n", CC->room.QRname);
1161
1162         /* If there are digest recipients, we have to build a digest */
1163         if (sc->digestrecps != NULL) {
1164                 sc->digestfp = tmpfile();
1165                 fprintf(sc->digestfp, "Content-type: text/plain\n\n");
1166         }
1167
1168         /* Do something useful */
1169         CtdlForEachMessage(MSGS_GT, sc->lastsent, NULL, NULL, NULL,
1170                 network_spool_msg, sc);
1171
1172         /* If we wrote a digest, deliver it and then close it */
1173         snprintf(buf, sizeof buf, "room_%s@%s",
1174                 CC->room.QRname, config.c_fqdn);
1175         for (i=0; buf[i]; ++i) {
1176                 buf[i] = tolower(buf[i]);
1177                 if (isspace(buf[i])) buf[i] = '_';
1178         }
1179         if (sc->digestfp != NULL) {
1180                 fprintf(sc->digestfp,   " -----------------------------------"
1181                                         "------------------------------------"
1182                                         "-------\n"
1183                                         "You are subscribed to the '%s' "
1184                                         "list.\n"
1185                                         "To post to the list: %s\n",
1186                                         CC->room.QRname, buf
1187                 );
1188                 network_deliver_digest(sc);     /* deliver and close */
1189         }
1190
1191         /* Now rewrite the config file */
1192         writenfree_spoolcontrol_file (&sc, filename);
1193         end_critical_section(S_NETCONFIGS);
1194 }
1195
1196
1197
1198 /*
1199  * Send the *entire* contents of the current room to one specific network node,
1200  * ignoring anything we know about which messages have already undergone
1201  * network processing.  This can be used to bring a new node into sync.
1202  */
1203 int network_sync_to(char *target_node) {
1204         SpoolControl sc;
1205         int num_spooled = 0;
1206         int found_node = 0;
1207         char buf[256];
1208         char sc_type[256];
1209         char sc_node[256];
1210         char sc_room[256];
1211         char filename[PATH_MAX];
1212         FILE *fp;
1213
1214         /* Grab the configuration line we're looking for */
1215         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1216         begin_critical_section(S_NETCONFIGS);
1217         fp = fopen(filename, "r");
1218         if (fp == NULL) {
1219                 end_critical_section(S_NETCONFIGS);
1220                 return(-1);
1221         }
1222         while (fgets(buf, sizeof buf, fp) != NULL) {
1223                 buf[strlen(buf)-1] = 0;
1224                 extract_token(sc_type, buf, 0, '|', sizeof sc_type);
1225                 extract_token(sc_node, buf, 1, '|', sizeof sc_node);
1226                 extract_token(sc_room, buf, 2, '|', sizeof sc_room);
1227                 if ( (!strcasecmp(sc_type, "ignet_push_share"))
1228                    && (!strcasecmp(sc_node, target_node)) ) {
1229                         found_node = 1;
1230
1231                         /* Concise syntax because we don't need a full linked-list */
1232                         memset(&sc, 0, sizeof(SpoolControl));
1233                         sc.ignet_push_shares = (maplist *)
1234                                 malloc(sizeof(maplist));
1235                         sc.ignet_push_shares->next = NULL;
1236                         safestrncpy(sc.ignet_push_shares->remote_nodename,
1237                                 sc_node,
1238                                 sizeof sc.ignet_push_shares->remote_nodename);
1239                         safestrncpy(sc.ignet_push_shares->remote_roomname,
1240                                 sc_room,
1241                                 sizeof sc.ignet_push_shares->remote_roomname);
1242                 }
1243         }
1244         fclose(fp);
1245         end_critical_section(S_NETCONFIGS);
1246
1247         if (!found_node) return(-1);
1248
1249         /* Send ALL messages */
1250         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL,
1251                 network_spool_msg, &sc);
1252
1253         /* Concise cleanup because we know there's only one node in the sc */
1254         free(sc.ignet_push_shares);
1255
1256         CtdlLogPrintf(CTDL_NOTICE, "Synchronized %d messages to <%s>\n",
1257                 num_spooled, target_node);
1258         return(num_spooled);
1259 }
1260
1261
1262 /*
1263  * Implements the NSYN command
1264  */
1265 void cmd_nsyn(char *argbuf) {
1266         int num_spooled;
1267         char target_node[256];
1268
1269         if (CtdlAccessCheck(ac_aide)) return;
1270
1271         extract_token(target_node, argbuf, 0, '|', sizeof target_node);
1272         num_spooled = network_sync_to(target_node);
1273         if (num_spooled >= 0) {
1274                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
1275         }
1276         else {
1277                 cprintf("%d No such room/node share exists.\n",
1278                         ERROR + ROOM_NOT_FOUND);
1279         }
1280 }
1281
1282
1283
1284 /*
1285  * Batch up and send all outbound traffic from the current room
1286  */
1287 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
1288         struct RoomProcList *ptr;
1289
1290         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
1291         if (ptr == NULL) return;
1292
1293         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
1294         begin_critical_section(S_RPLIST);
1295         ptr->next = rplist;
1296         rplist = ptr;
1297         end_critical_section(S_RPLIST);
1298 }
1299
1300 void destroy_network_queue_room(void)
1301 {
1302         struct RoomProcList *cur, *p;
1303         NetMap *nmcur, *nmp;
1304
1305         cur = rplist;
1306         begin_critical_section(S_RPLIST);
1307         while (cur != NULL)
1308         {
1309                 p = cur->next;
1310                 free (cur);
1311                 cur = p;
1312         }
1313         rplist = NULL;
1314         end_critical_section(S_RPLIST);
1315
1316         nmcur = the_netmap;
1317         while (nmcur != NULL)
1318         {
1319                 nmp = nmcur->next;
1320                 free (nmcur);
1321                 nmcur = nmp;
1322         }
1323         the_netmap = NULL;
1324         if (working_ignetcfg != NULL)
1325                 free (working_ignetcfg);
1326         working_ignetcfg = NULL;
1327 }
1328
1329
1330 /*
1331  * Learn topology from path fields
1332  */
1333 void network_learn_topology(char *node, char *path) {
1334         char nexthop[256];
1335         NetMap *nmptr;
1336
1337         strcpy(nexthop, "");
1338
1339         if (num_tokens(path, '!') < 3) return;
1340         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
1341                 if (!strcasecmp(nmptr->nodename, node)) {
1342                         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1343                         nmptr->lastcontact = time(NULL);
1344                         ++netmap_changed;
1345                         return;
1346                 }
1347         }
1348
1349         /* If we got here then it's not in the map, so add it. */
1350         nmptr = (NetMap *) malloc(sizeof (NetMap));
1351         strcpy(nmptr->nodename, node);
1352         nmptr->lastcontact = time(NULL);
1353         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1354         nmptr->next = the_netmap;
1355         the_netmap = nmptr;
1356         ++netmap_changed;
1357 }
1358
1359
1360
1361
1362 /*
1363  * Bounce a message back to the sender
1364  */
1365 void network_bounce(struct CtdlMessage *msg, char *reason) {
1366         char *oldpath = NULL;
1367         char buf[SIZ];
1368         char bouncesource[SIZ];
1369         char recipient[SIZ];
1370         struct recptypes *valid = NULL;
1371         char force_room[ROOMNAMELEN];
1372         static int serialnum = 0;
1373         size_t size;
1374
1375         CtdlLogPrintf(CTDL_DEBUG, "entering network_bounce()\n");
1376
1377         if (msg == NULL) return;
1378
1379         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
1380
1381         /*
1382          * Give it a fresh message ID
1383          */
1384         if (msg->cm_fields['I'] != NULL) {
1385                 free(msg->cm_fields['I']);
1386         }
1387         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
1388                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
1389         msg->cm_fields['I'] = strdup(buf);
1390
1391         /*
1392          * FIXME ... right now we're just sending a bounce; we really want to
1393          * include the text of the bounced message.
1394          */
1395         if (msg->cm_fields['M'] != NULL) {
1396                 free(msg->cm_fields['M']);
1397         }
1398         msg->cm_fields['M'] = strdup(reason);
1399         msg->cm_format_type = 0;
1400
1401         /*
1402          * Turn the message around
1403          */
1404         if (msg->cm_fields['R'] == NULL) {
1405                 free(msg->cm_fields['R']);
1406         }
1407
1408         if (msg->cm_fields['D'] == NULL) {
1409                 free(msg->cm_fields['D']);
1410         }
1411
1412         snprintf(recipient, sizeof recipient, "%s@%s",
1413                 msg->cm_fields['A'], msg->cm_fields['N']);
1414
1415         if (msg->cm_fields['A'] == NULL) {
1416                 free(msg->cm_fields['A']);
1417         }
1418
1419         if (msg->cm_fields['N'] == NULL) {
1420                 free(msg->cm_fields['N']);
1421         }
1422
1423         if (msg->cm_fields['U'] == NULL) {
1424                 free(msg->cm_fields['U']);
1425         }
1426
1427         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1428         msg->cm_fields['N'] = strdup(config.c_nodename);
1429         msg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
1430
1431         /* prepend our node to the path */
1432         if (msg->cm_fields['P'] != NULL) {
1433                 oldpath = msg->cm_fields['P'];
1434                 msg->cm_fields['P'] = NULL;
1435         }
1436         else {
1437                 oldpath = strdup("unknown_user");
1438         }
1439         size = strlen(oldpath) + SIZ;
1440         msg->cm_fields['P'] = malloc(size);
1441         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1442         free(oldpath);
1443
1444         /* Now submit the message */
1445         valid = validate_recipients(recipient, NULL, 0);
1446         if (valid != NULL) if (valid->num_error != 0) {
1447                 free_recipients(valid);
1448                 valid = NULL;
1449         }
1450         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1451                 strcpy(force_room, config.c_aideroom);
1452         }
1453         else {
1454                 strcpy(force_room, "");
1455         }
1456         if ( (valid == NULL) && IsEmptyStr(force_room) ) {
1457                 strcpy(force_room, config.c_aideroom);
1458         }
1459         CtdlSubmitMsg(msg, valid, force_room, 0);
1460
1461         /* Clean up */
1462         if (valid != NULL) free_recipients(valid);
1463         CtdlFreeMessage(msg);
1464         CtdlLogPrintf(CTDL_DEBUG, "leaving network_bounce()\n");
1465 }
1466
1467
1468
1469
1470 /*
1471  * Process a buffer containing a single message from a single file
1472  * from the inbound queue
1473  */
1474 void network_process_buffer(char *buffer, long size) {
1475         struct CtdlMessage *msg = NULL;
1476         long pos;
1477         int field;
1478         struct recptypes *recp = NULL;
1479         char target_room[ROOMNAMELEN];
1480         struct ser_ret sermsg;
1481         char *oldpath = NULL;
1482         char filename[PATH_MAX];
1483         FILE *fp;
1484         char nexthop[SIZ];
1485         unsigned char firstbyte;
1486         unsigned char lastbyte;
1487
1488         CtdlLogPrintf(CTDL_DEBUG, "network_process_buffer() processing %ld bytes\n", size);
1489
1490         /* Validate just a little bit.  First byte should be FF and * last byte should be 00. */
1491         firstbyte = buffer[0];
1492         lastbyte = buffer[size-1];
1493         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1494                 CtdlLogPrintf(CTDL_ERR, "Corrupt message ignored.  Length=%ld, firstbyte = %d, lastbyte = %d\n",
1495                         size, firstbyte, lastbyte);
1496                 return;
1497         }
1498
1499         /* Set default target room to trash */
1500         strcpy(target_room, TWITROOM);
1501
1502         /* Load the message into memory */
1503         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1504         memset(msg, 0, sizeof(struct CtdlMessage));
1505         msg->cm_magic = CTDLMESSAGE_MAGIC;
1506         msg->cm_anon_type = buffer[1];
1507         msg->cm_format_type = buffer[2];
1508
1509         for (pos = 3; pos < size; ++pos) {
1510                 field = buffer[pos];
1511                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1512                 pos = pos + strlen(&buffer[(int)pos]);
1513         }
1514
1515         /* Check for message routing */
1516         if (msg->cm_fields['D'] != NULL) {
1517                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1518
1519                         /* route the message */
1520                         strcpy(nexthop, "");
1521                         if (is_valid_node(nexthop, NULL, msg->cm_fields['D']) == 0) {
1522                                 /* prepend our node to the path */
1523                                 if (msg->cm_fields['P'] != NULL) {
1524                                         oldpath = msg->cm_fields['P'];
1525                                         msg->cm_fields['P'] = NULL;
1526                                 }
1527                                 else {
1528                                         oldpath = strdup("unknown_user");
1529                                 }
1530                                 size = strlen(oldpath) + SIZ;
1531                                 msg->cm_fields['P'] = malloc(size);
1532                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1533                                         config.c_nodename, oldpath);
1534                                 free(oldpath);
1535
1536                                 /* serialize the message */
1537                                 serialize_message(&sermsg, msg);
1538
1539                                 /* now send it */
1540                                 if (IsEmptyStr(nexthop)) {
1541                                         strcpy(nexthop, msg->cm_fields['D']);
1542                                 }
1543                                 snprintf(filename,
1544                                                  sizeof filename,
1545                                                  "%s/%s",
1546                                                  ctdl_netout_dir,
1547                                                  nexthop);
1548                                 CtdlLogPrintf(CTDL_DEBUG, "Appending to %s\n", filename);
1549                                 fp = fopen(filename, "ab");
1550                                 if (fp != NULL) {
1551                                         fwrite(sermsg.ser,
1552                                                 sermsg.len, 1, fp);
1553                                         fclose(fp);
1554                                 }
1555                                 else {
1556                                         CtdlLogPrintf(CTDL_ERR, "%s: %s\n", filename, strerror(errno));
1557                                 }
1558                                 free(sermsg.ser);
1559                                 CtdlFreeMessage(msg);
1560                                 return;
1561                         }
1562
1563                         else {  /* invalid destination node name */
1564
1565                                 network_bounce(msg,
1566 "A message you sent could not be delivered due to an invalid destination node"
1567 " name.  Please check the address and try sending the message again.\n");
1568                                 msg = NULL;
1569                                 return;
1570
1571                         }
1572                 }
1573         }
1574
1575         /*
1576          * Check to see if we already have a copy of this message, and
1577          * abort its processing if so.  (We used to post a warning to Aide>
1578          * every time this happened, but the network is now so densely
1579          * connected that it's inevitable.)
1580          */
1581         if (network_usetable(msg) != 0) {
1582                 CtdlFreeMessage(msg);
1583                 return;
1584         }
1585
1586         /* Learn network topology from the path */
1587         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1588                 network_learn_topology(msg->cm_fields['N'], msg->cm_fields['P']);
1589         }
1590
1591         /* Is the sending node giving us a very persuasive suggestion about
1592          * which room this message should be saved in?  If so, go with that.
1593          */
1594         if (msg->cm_fields['C'] != NULL) {
1595                 safestrncpy(target_room, msg->cm_fields['C'], sizeof target_room);
1596         }
1597
1598         /* Otherwise, does it have a recipient?  If so, validate it... */
1599         else if (msg->cm_fields['R'] != NULL) {
1600                 recp = validate_recipients(msg->cm_fields['R'], NULL, 0);
1601                 if (recp != NULL) if (recp->num_error != 0) {
1602                         network_bounce(msg,
1603                                 "A message you sent could not be delivered due to an invalid address.\n"
1604                                 "Please check the address and try sending the message again.\n");
1605                         msg = NULL;
1606                         free_recipients(recp);
1607                         CtdlLogPrintf(CTDL_DEBUG, "Bouncing message due to invalid recipient address.\n");
1608                         return;
1609                 }
1610                 strcpy(target_room, "");        /* no target room if mail */
1611         }
1612
1613         /* Our last shot at finding a home for this message is to see if
1614          * it has the O field (Originating room) set.
1615          */
1616         else if (msg->cm_fields['O'] != NULL) {
1617                 safestrncpy(target_room, msg->cm_fields['O'], sizeof target_room);
1618         }
1619
1620         /* Strip out fields that are only relevant during transit */
1621         if (msg->cm_fields['D'] != NULL) {
1622                 free(msg->cm_fields['D']);
1623                 msg->cm_fields['D'] = NULL;
1624         }
1625         if (msg->cm_fields['C'] != NULL) {
1626                 free(msg->cm_fields['C']);
1627                 msg->cm_fields['C'] = NULL;
1628         }
1629
1630         /* save the message into a room */
1631         if (PerformNetprocHooks(msg, target_room) == 0) {
1632                 msg->cm_flags = CM_SKIP_HOOKS;
1633                 CtdlSubmitMsg(msg, recp, target_room, 0);
1634         }
1635         CtdlFreeMessage(msg);
1636         free_recipients(recp);
1637 }
1638
1639
1640 /*
1641  * Process a single message from a single file from the inbound queue
1642  */
1643 void network_process_message(FILE *fp, long msgstart, long msgend) {
1644         long hold_pos;
1645         long size;
1646         char *buffer;
1647
1648         hold_pos = ftell(fp);
1649         size = msgend - msgstart + 1;
1650         buffer = malloc(size);
1651         if (buffer != NULL) {
1652                 fseek(fp, msgstart, SEEK_SET);
1653                 if (fread(buffer, size, 1, fp) > 0) {
1654                         network_process_buffer(buffer, size);
1655                 }
1656                 free(buffer);
1657         }
1658
1659         fseek(fp, hold_pos, SEEK_SET);
1660 }
1661
1662
1663 /*
1664  * Process a single file from the inbound queue
1665  */
1666 void network_process_file(char *filename) {
1667         FILE *fp;
1668         long msgstart = (-1L);
1669         long msgend = (-1L);
1670         long msgcur = 0L;
1671         int ch;
1672
1673
1674         fp = fopen(filename, "rb");
1675         if (fp == NULL) {
1676                 CtdlLogPrintf(CTDL_CRIT, "Error opening %s: %s\n", filename, strerror(errno));
1677                 return;
1678         }
1679
1680         fseek(fp, 0L, SEEK_END);
1681         CtdlLogPrintf(CTDL_INFO, "network: processing %ld bytes from %s\n", ftell(fp), filename);
1682         rewind(fp);
1683
1684         /* Look for messages in the data stream and break them out */
1685         while (ch = getc(fp), ch >= 0) {
1686
1687                 if (ch == 255) {
1688                         if (msgstart >= 0L) {
1689                                 msgend = msgcur - 1;
1690                                 network_process_message(fp, msgstart, msgend);
1691                         }
1692                         msgstart = msgcur;
1693                 }
1694
1695                 ++msgcur;
1696         }
1697
1698         msgend = msgcur - 1;
1699         if (msgstart >= 0L) {
1700                 network_process_message(fp, msgstart, msgend);
1701         }
1702
1703         fclose(fp);
1704         unlink(filename);
1705 }
1706
1707
1708 /*
1709  * Process anything in the inbound queue
1710  */
1711 void network_do_spoolin(void) {
1712         DIR *dp;
1713         struct dirent *d;
1714         struct stat statbuf;
1715         char filename[PATH_MAX];
1716         static time_t last_spoolin_mtime = 0L;
1717
1718         /*
1719          * Check the spoolin directory's modification time.  If it hasn't
1720          * been touched, we don't need to scan it.
1721          */
1722         if (stat(ctdl_netin_dir, &statbuf)) return;
1723         if (statbuf.st_mtime == last_spoolin_mtime) {
1724                 CtdlLogPrintf(CTDL_DEBUG, "network: nothing in inbound queue\n");
1725                 return;
1726         }
1727         last_spoolin_mtime = statbuf.st_mtime;
1728         CtdlLogPrintf(CTDL_DEBUG, "network: processing inbound queue\n");
1729
1730         /*
1731          * Ok, there's something interesting in there, so scan it.
1732          */
1733         dp = opendir(ctdl_netin_dir);
1734         if (dp == NULL) return;
1735
1736         while (d = readdir(dp), d != NULL) {
1737                 if ((strcmp(d->d_name, ".")) && (strcmp(d->d_name, ".."))) {
1738                         snprintf(filename,
1739                                          sizeof filename,
1740                                          "%s/%s",
1741                                          ctdl_netin_dir,
1742                                          d->d_name);
1743                         network_process_file(filename);
1744                 }
1745         }
1746
1747         closedir(dp);
1748 }
1749
1750 /*
1751  * Delete any files in the outbound queue that were intended
1752  * to be sent to nodes which no longer exist.
1753  */
1754 void network_purge_spoolout(void) {
1755         DIR *dp;
1756         struct dirent *d;
1757         char filename[PATH_MAX];
1758         char nexthop[256];
1759         int i;
1760
1761         dp = opendir(ctdl_netout_dir);
1762         if (dp == NULL) return;
1763
1764         while (d = readdir(dp), d != NULL) {
1765                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
1766                         continue;
1767                 snprintf(filename,
1768                                  sizeof filename,
1769                                  "%s/%s",
1770                                  ctdl_netout_dir,
1771                                  d->d_name);
1772
1773                 strcpy(nexthop, "");
1774                 i = is_valid_node(nexthop, NULL, d->d_name);
1775
1776                 if ( (i != 0) || !IsEmptyStr(nexthop) ) {
1777                         unlink(filename);
1778                 }
1779         }
1780
1781
1782         closedir(dp);
1783 }
1784
1785
1786 /*
1787  * receive network spool from the remote system
1788  */
1789 void receive_spool(int *sock, char *remote_nodename) {
1790         size_t siz;
1791         long download_len = 0L;
1792         long bytes_received = 0L;
1793         long bytes_copied = 0L;
1794         char buf[SIZ];
1795         static char pbuf[IGNET_PACKET_SIZE];
1796         char tempfilename[PATH_MAX];
1797         char filename[PATH_MAX];
1798         long plen;
1799         FILE *fp, *newfp;
1800
1801         CtdlMakeTempFileName(tempfilename, sizeof tempfilename);
1802         if (sock_puts(*sock, "NDOP") < 0) return;
1803         if (sock_getln(sock, buf, sizeof buf) < 0) return;
1804         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1805         if (buf[0] != '2') {
1806                 return;
1807         }
1808         download_len = extract_long(&buf[4], 0);
1809
1810         bytes_received = 0L;
1811         fp = fopen(tempfilename, "w");
1812         if (fp == NULL) {
1813                 CtdlLogPrintf(CTDL_CRIT, "cannot open download file locally: %s\n",
1814                         strerror(errno));
1815                 return;
1816         }
1817
1818         while (bytes_received < download_len) {
1819                 /**
1820                  * If shutting down we can exit here and unlink the temp file.
1821                  * this shouldn't loose us any messages.
1822                  */
1823                 if (CtdlThreadCheckStop())
1824                 {
1825                         fclose(fp);
1826                         unlink(tempfilename);
1827                         return;
1828                 }
1829                 snprintf(buf, sizeof buf, "READ %ld|%ld",
1830                         bytes_received,
1831                      ((download_len - bytes_received > IGNET_PACKET_SIZE)
1832                  ? IGNET_PACKET_SIZE : (download_len - bytes_received)));
1833                 if (sock_puts(*sock, buf) < 0) {
1834                         fclose(fp);
1835                         unlink(tempfilename);
1836                         return;
1837                 }
1838                 if (sock_getln(sock, buf, sizeof buf) < 0) {
1839                         fclose(fp);
1840                         unlink(tempfilename);
1841                         return;
1842                 }
1843                 if (buf[0] == '6') {
1844                         plen = extract_long(&buf[4], 0);
1845                         if (sock_read(sock, pbuf, plen, 1) < 0) {
1846                                 fclose(fp);
1847                                 unlink(tempfilename);
1848                                 return;
1849                         }
1850                         fwrite((char *) pbuf, plen, 1, fp);
1851                         bytes_received = bytes_received + plen;
1852                 }
1853         }
1854
1855         fclose(fp);
1856         /** Last chance for shutdown exit */
1857         if (CtdlThreadCheckStop())
1858         {
1859                 unlink(tempfilename);
1860                 return;
1861         }
1862         if (sock_puts(*sock, "CLOS") < 0) {
1863                 unlink(tempfilename);
1864                 return;
1865         }
1866         /**
1867          * From here on we must complete or messages will get lost
1868          */
1869         if (sock_getln(sock, buf, sizeof buf) < 0) {
1870                 unlink(tempfilename);
1871                 return;
1872         }
1873         if (download_len > 0) {
1874                 CtdlLogPrintf(CTDL_NOTICE, "Received %ld octets from <%s>\n", download_len, remote_nodename);
1875         }
1876         CtdlLogPrintf(CTDL_DEBUG, "%s\n", buf);
1877
1878         /* Now copy the temp file to its permanent location.
1879          * (We copy instead of link because they may be on different filesystems)
1880          */
1881         begin_critical_section(S_NETSPOOL);
1882         snprintf(filename,
1883                          sizeof filename,
1884                          "%s/%s.%ld",
1885                          ctdl_netin_dir,
1886                          remote_nodename,
1887                          (long) getpid()
1888         );
1889         fp = fopen(tempfilename, "r");
1890         if (fp != NULL) {
1891                 newfp = fopen(filename, "w");
1892                 if (newfp != NULL) {
1893                         bytes_copied = 0L;
1894                         while (bytes_copied < download_len) {
1895                                 plen = download_len - bytes_copied;
1896                                 if (plen > sizeof buf) {
1897                                         plen = sizeof buf;
1898                                 }
1899                                 siz = fread(buf, plen, 1, fp);
1900                                 fwrite(buf, plen, 1, newfp);
1901                                 bytes_copied += plen;
1902                         }
1903                         fclose(newfp);
1904                 }
1905                 fclose(fp);
1906         }
1907         end_critical_section(S_NETSPOOL);
1908         unlink(tempfilename);
1909 }
1910
1911
1912
1913 /*
1914  * transmit network spool to the remote system
1915  */
1916 void transmit_spool(int *sock, char *remote_nodename)
1917 {
1918         char buf[SIZ];
1919         char pbuf[4096];
1920         long plen;
1921         long bytes_to_write, thisblock, bytes_written;
1922         int fd;
1923         char sfname[128];
1924
1925         if (sock_puts(*sock, "NUOP") < 0) return;
1926         if (sock_getln(sock, buf, sizeof buf) < 0) return;
1927         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1928         if (buf[0] != '2') {
1929                 return;
1930         }
1931
1932         snprintf(sfname, sizeof sfname,
1933                          "%s/%s",
1934                          ctdl_netout_dir,
1935                          remote_nodename);
1936         fd = open(sfname, O_RDONLY);
1937         if (fd < 0) {
1938                 if (errno != ENOENT) {
1939                         CtdlLogPrintf(CTDL_CRIT, "cannot open upload file locally: %s\n",
1940                                 strerror(errno));
1941                 }
1942                 return;
1943         }
1944         bytes_written = 0;
1945         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
1946                 bytes_to_write = plen;
1947                 while (bytes_to_write > 0L) {
1948                         /** Exit if shutting down */
1949                         if (CtdlThreadCheckStop())
1950                         {
1951                                 close(fd);
1952                                 return;
1953                         }
1954
1955                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
1956                         if (sock_puts(*sock, buf) < 0) {
1957                                 close(fd);
1958                                 return;
1959                         }
1960                         if (sock_getln(sock, buf, sizeof buf) < 0) {
1961                                 close(fd);
1962                                 return;
1963                         }
1964                         thisblock = atol(&buf[4]);
1965                         if (buf[0] == '7') {
1966                                 if (sock_write(*sock, pbuf,
1967                                    (int) thisblock) < 0) {
1968                                         close(fd);
1969                                         return;
1970                                 }
1971                                 bytes_to_write -= thisblock;
1972                                 bytes_written += thisblock;
1973                         } else {
1974                                 goto ABORTUPL;
1975                         }
1976                 }
1977         }
1978
1979 ABORTUPL:
1980         close(fd);
1981         /** Last chance for shutdown exit */
1982         if(CtdlThreadCheckStop())
1983                 return;
1984
1985         if (sock_puts(*sock, "UCLS 1") < 0) return;
1986         /**
1987          * From here on we must complete or messages will get lost
1988          */
1989         if (sock_getln(sock, buf, sizeof buf) < 0) return;
1990         CtdlLogPrintf(CTDL_NOTICE, "Sent %ld octets to <%s>\n",
1991                         bytes_written, remote_nodename);
1992         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1993         if (buf[0] == '2') {
1994                 CtdlLogPrintf(CTDL_DEBUG, "Removing <%s>\n", sfname);
1995                 unlink(sfname);
1996         }
1997 }
1998
1999
2000
2001 /*
2002  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
2003  */
2004 void network_poll_node(char *node, char *secret, char *host, char *port) {
2005         int sock;
2006         char buf[SIZ];
2007         char err_buf[SIZ];
2008         char connected_to[SIZ];
2009
2010         if (network_talking_to(node, NTT_CHECK)) return;
2011         network_talking_to(node, NTT_ADD);
2012         CtdlLogPrintf(CTDL_NOTICE, "Connecting to <%s> at %s:%s\n", node, host, port);
2013
2014         sock = sock_connect(host, port, "tcp");
2015         if (sock < 0) {
2016                 CtdlLogPrintf(CTDL_ERR, "Could not connect: %s\n", strerror(errno));
2017                 network_talking_to(node, NTT_REMOVE);
2018                 return;
2019         }
2020
2021         CtdlLogPrintf(CTDL_DEBUG, "Connected!\n");
2022
2023         /* Read the server greeting */
2024         if (sock_getln(&sock, buf, sizeof buf) < 0) goto bail;
2025         CtdlLogPrintf(CTDL_DEBUG, ">%s\n", buf);
2026
2027         /* Check that the remote is who we think it is and warn the Aide if not */
2028         extract_token (connected_to, buf, 1, ' ', sizeof connected_to);
2029         if (strcmp(connected_to, node))
2030         {
2031                 snprintf (err_buf, sizeof(err_buf), "Connected to node \"%s\" but I was expecting to connect to node \"%s\".", connected_to, node);
2032                 CtdlLogPrintf(CTDL_ERR, "%s\n", err_buf);
2033                 CtdlAideMessage(err_buf, "Network error");
2034         }
2035         else {
2036                 /* We're talking to the correct node.  Now identify ourselves. */
2037                 snprintf(buf, sizeof buf, "NETP %s|%s", config.c_nodename, secret);
2038                 CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
2039                 if (sock_puts(sock, buf) <0) goto bail;
2040                 if (sock_getln(&sock, buf, sizeof buf) < 0) goto bail;
2041                 CtdlLogPrintf(CTDL_DEBUG, ">%s\n", buf);
2042                 if (buf[0] != '2') goto bail;
2043
2044                 /* At this point we are authenticated. */
2045                 if (!CtdlThreadCheckStop())
2046                         receive_spool(&sock, node);
2047                 if (!CtdlThreadCheckStop())
2048                         transmit_spool(&sock, node);
2049         }
2050
2051         sock_puts(sock, "QUIT");
2052 bail:   sock_close(sock);
2053         network_talking_to(node, NTT_REMOVE);
2054 }
2055
2056
2057
2058 /*
2059  * Poll other Citadel nodes and transfer inbound/outbound network data.
2060  * Set "full" to nonzero to force a poll of every node, or to zero to poll
2061  * only nodes to which we have data to send.
2062  */
2063 void network_poll_other_citadel_nodes(int full_poll) {
2064         int i;
2065         char linebuf[256];
2066         char node[SIZ];
2067         char host[256];
2068         char port[256];
2069         char secret[256];
2070         int poll = 0;
2071         char spoolfile[256];
2072
2073         if (working_ignetcfg == NULL) {
2074                 CtdlLogPrintf(CTDL_DEBUG, "No nodes defined - not polling\n");
2075                 return;
2076         }
2077
2078         /* Use the string tokenizer to grab one line at a time */
2079         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
2080                 if(CtdlThreadCheckStop())
2081                         return;
2082                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
2083                 extract_token(node, linebuf, 0, '|', sizeof node);
2084                 extract_token(secret, linebuf, 1, '|', sizeof secret);
2085                 extract_token(host, linebuf, 2, '|', sizeof host);
2086                 extract_token(port, linebuf, 3, '|', sizeof port);
2087                 if ( !IsEmptyStr(node) && !IsEmptyStr(secret)
2088                    && !IsEmptyStr(host) && !IsEmptyStr(port)) {
2089                         poll = full_poll;
2090                         if (poll == 0) {
2091                                 snprintf(spoolfile,
2092                                                  sizeof spoolfile,
2093                                                  "%s/%s",
2094                                                  ctdl_netout_dir,
2095                                                  node);
2096                                 if (access(spoolfile, R_OK) == 0) {
2097                                         poll = 1;
2098                                 }
2099                         }
2100                         if (poll) {
2101                                 network_poll_node(node, secret, host, port);
2102                         }
2103                 }
2104         }
2105
2106 }
2107
2108
2109
2110
2111 /*
2112  * It's ok if these directories already exist.  Just fail silently.
2113  */
2114 void create_spool_dirs(void) {
2115         if ((mkdir(ctdl_spool_dir, 0700) != 0) && (errno != EEXIST))
2116                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_spool_dir, strerror(errno));
2117         if (chown(ctdl_spool_dir, CTDLUID, (-1)) != 0)
2118                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_spool_dir, strerror(errno));
2119         if ((mkdir(ctdl_netin_dir, 0700) != 0) && (errno != EEXIST))
2120                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_netin_dir, strerror(errno));
2121         if (chown(ctdl_netin_dir, CTDLUID, (-1)) != 0)
2122                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netin_dir, strerror(errno));
2123         if ((mkdir(ctdl_netout_dir, 0700) != 0) && (errno != EEXIST))
2124                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_netout_dir, strerror(errno));
2125         if (chown(ctdl_netout_dir, CTDLUID, (-1)) != 0)
2126                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netout_dir, strerror(errno));
2127 }
2128
2129
2130
2131
2132
2133 /*
2134  * network_do_queue()
2135  *
2136  * Run through the rooms doing various types of network stuff.
2137  */
2138 void *network_do_queue(void *args) {
2139         static time_t last_run = 0L;
2140         struct RoomProcList *ptr;
2141         int full_processing = 1;
2142         struct CitContext networkerCC;
2143
2144         /* Give the networker its own private CitContext */
2145         CtdlFillSystemContext(&networkerCC, "network");
2146         citthread_setspecific(MyConKey, (void *)&networkerCC );
2147
2148         /*
2149          * Run the full set of processing tasks no more frequently
2150          * than once every n seconds
2151          */
2152         if ( (time(NULL) - last_run) < config.c_net_freq ) {
2153                 full_processing = 0;
2154                 CtdlLogPrintf(CTDL_DEBUG, "Network full processing in %ld seconds.\n", config.c_net_freq - (time(NULL)- last_run));
2155         }
2156
2157         /*
2158          * This is a simple concurrency check to make sure only one queue run
2159          * is done at a time.  We could do this with a mutex, but since we
2160          * don't really require extremely fine granularity here, we'll do it
2161          * with a static variable instead.
2162          */
2163         if (doing_queue) return NULL;
2164         doing_queue = 1;
2165
2166         /* Load the IGnet Configuration into memory */
2167         load_working_ignetcfg();
2168
2169         /*
2170          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
2171          * then we poll everyone.  Otherwise we only poll nodes we have stuff
2172          * to send to.
2173          */
2174         network_poll_other_citadel_nodes(full_processing);
2175
2176         /*
2177          * Load the network map and filter list into memory.
2178          */
2179         read_network_map();
2180         filterlist = load_filter_list();
2181
2182         /*
2183          * Go ahead and run the queue
2184          */
2185         if (full_processing && !CtdlThreadCheckStop()) {
2186                 CtdlLogPrintf(CTDL_DEBUG, "network: loading outbound queue\n");
2187                 CtdlForEachRoom(network_queue_room, NULL);
2188         }
2189
2190         if (rplist != NULL) {
2191                 CtdlLogPrintf(CTDL_DEBUG, "network: running outbound queue\n");
2192                 while (rplist != NULL && !CtdlThreadCheckStop()) {
2193                         char spoolroomname[ROOMNAMELEN];
2194                         safestrncpy(spoolroomname, rplist->name, sizeof spoolroomname);
2195                         begin_critical_section(S_RPLIST);
2196
2197                         /* pop this record off the list */
2198                         ptr = rplist;
2199                         rplist = rplist->next;
2200                         free(ptr);
2201
2202                         /* invalidate any duplicate entries to prevent double processing */
2203                         for (ptr=rplist; ptr!=NULL; ptr=ptr->next) {
2204                                 if (!strcasecmp(ptr->name, spoolroomname)) {
2205                                         ptr->name[0] = 0;
2206                                 }
2207                         }
2208
2209                         end_critical_section(S_RPLIST);
2210                         if (spoolroomname[0] != 0) {
2211                                 network_spoolout_room(spoolroomname);
2212                         }
2213                 }
2214         }
2215
2216         /* If there is anything in the inbound queue, process it */
2217         if (!CtdlThreadCheckStop())
2218                 network_do_spoolin();
2219
2220         /* Save the network map back to disk */
2221         write_network_map();
2222
2223         /* Free the filter list in memory */
2224         free_filter_list(filterlist);
2225         filterlist = NULL;
2226
2227         network_purge_spoolout();
2228
2229         CtdlLogPrintf(CTDL_DEBUG, "network: queue run completed\n");
2230
2231         if (full_processing) {
2232                 last_run = time(NULL);
2233         }
2234
2235         doing_queue = 0;
2236         if (!CtdlThreadCheckStop()) // Only reschedule if system is not stopping
2237                 CtdlThreadSchedule("IGnet Network", CTDLTHREAD_BIGSTACK, network_do_queue, NULL, time(NULL) + 60);
2238         else
2239                 CtdlLogPrintf(CTDL_DEBUG, "network: Task STOPPED.\n");
2240         return NULL;
2241 }
2242
2243
2244 /*
2245  * cmd_netp() - authenticate to the server as another Citadel node polling
2246  *            for network traffic
2247  */
2248 void cmd_netp(char *cmdbuf)
2249 {
2250         char node[256];
2251         char pass[256];
2252         int v;
2253
2254         char secret[256];
2255         char nexthop[256];
2256         char err_buf[SIZ];
2257
2258         /* Authenticate */
2259         extract_token(node, cmdbuf, 0, '|', sizeof node);
2260         extract_token(pass, cmdbuf, 1, '|', sizeof pass);
2261
2262         if (doing_queue) {
2263                 CtdlLogPrintf(CTDL_WARNING, "Network node <%s> refused - spooling\n", node);
2264                 cprintf("%d spooling - try again in a few minutes\n", ERROR + RESOURCE_BUSY);
2265                 return;
2266         }
2267
2268         /* load the IGnet Configuration to check node validity */
2269         load_working_ignetcfg();
2270         v = is_valid_node(nexthop, secret, node);
2271
2272         if (v != 0) {
2273                 snprintf(err_buf, sizeof err_buf,
2274                         "An unknown Citadel server called \"%s\" attempted to connect from %s [%s].\n",
2275                         node, CC->cs_host, CC->cs_addr
2276                 );
2277                 CtdlLogPrintf(CTDL_WARNING, err_buf);
2278                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2279                 CtdlAideMessage(err_buf, "IGNet Networking.");
2280                 return;
2281         }
2282
2283         if (strcasecmp(pass, secret)) {
2284                 snprintf(err_buf, sizeof err_buf,
2285                         "A Citadel server at %s [%s] failed to authenticate as network node \"%s\".\n",
2286                         CC->cs_host, CC->cs_addr, node
2287                 );
2288                 CtdlLogPrintf(CTDL_WARNING, err_buf);
2289                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2290                 CtdlAideMessage(err_buf, "IGNet Networking.");
2291                 return;
2292         }
2293
2294         if (network_talking_to(node, NTT_CHECK)) {
2295                 CtdlLogPrintf(CTDL_WARNING, "Duplicate session for network node <%s>", node);
2296                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
2297                 return;
2298         }
2299
2300         safestrncpy(CC->net_node, node, sizeof CC->net_node);
2301         network_talking_to(node, NTT_ADD);
2302         CtdlLogPrintf(CTDL_NOTICE, "Network node <%s> logged in from %s [%s]\n",
2303                 CC->net_node, CC->cs_host, CC->cs_addr
2304         );
2305         cprintf("%d authenticated as network node '%s'\n", CIT_OK, CC->net_node);
2306 }
2307
2308
2309 int network_room_handler (struct ctdlroom *room)
2310 {
2311         network_queue_room(room, NULL);
2312         return 0;
2313 }
2314
2315
2316 /*
2317  * Module entry point
2318  */
2319 CTDL_MODULE_INIT(network)
2320 {
2321         if (!threading)
2322         {
2323                 create_spool_dirs();
2324                 CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
2325                 CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
2326                 CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
2327                 CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
2328                 CtdlRegisterRoomHook(network_room_handler);
2329                 CtdlRegisterCleanupHook(destroy_network_queue_room);
2330         }
2331         else
2332                 CtdlThreadSchedule("IGnet Network", CTDLTHREAD_BIGSTACK, network_do_queue, NULL, 0);
2333         /* return our Subversion id for the Log */
2334         return "$Id$";
2335 }