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 = NewStrBufPlain(NULL, SIZ);
 720
 721                         safestrncpy(CC->preferred_formats, "text/plain", sizeof CC->preferred_formats);
 722                         CtdlOutputPreLoadedMsg(msg, MT_CITADEL, HEADERS_NONE, 0, 0, 0);
 723
 724                         StrBufTrim(CC->redirect_buffer);
 725                         fwrite(HKEY("\n"), 1, sc->digestfp);
 726                         fwrite(SKEY(CC->redirect_buffer), 1, sc->digestfp);
 727                         fwrite(HKEY("\n"), 1, sc->digestfp);
 728
 729                         FreeStrBuf(&CC->redirect_buffer);
 730
 731                         sc->num_msgs_spooled += 1;
 732                         free(msg);
 733                 }
 734         }
 735
 736         /*
 737          * Process client-side list participations for this room
 738          */
 739         instr_len = SIZ;
 740         if (sc->participates != NULL) {
 741                 msg = CtdlFetchMessage(msgnum, 1);
 742                 if (msg != NULL) {
 743
 744                         /* Only send messages which originated on our own Citadel
 745                          * network, otherwise we'll end up sending the remote
 746                          * mailing list's messages back to it, which is rude...
 747                          */
 748                         ok_to_participate = 0;
 749                         if (msg->cm_fields['N'] != NULL) {
 750                                 if (!strcasecmp(msg->cm_fields['N'], config.c_nodename)) {
 751                                         ok_to_participate = 1;
 752                                 }
 753                                 if (is_valid_node(NULL, NULL, msg->cm_fields['N']) == 0) {
 754                                         ok_to_participate = 1;
 755                                 }
 756                         }
 757                         if (ok_to_participate) {
 758                                 if (msg->cm_fields['F'] != NULL) {
 759                                         free(msg->cm_fields['F']);
 760                                 }
 761                                 msg->cm_fields['F'] = malloc(SIZ);
 762                                 /* Replace the Internet email address of the actual
 763                                 * author with the email address of the room itself,
 764                                 * so the remote listserv doesn't reject us.
 765                                 * FIXME ... I want to be able to pick any address
 766                                 */
 767                                 snprintf(msg->cm_fields['F'], SIZ,
 768                                         "room_%s@%s", CC->room.QRname,
 769                                         config.c_fqdn);
 770                                 for (i=0; msg->cm_fields['F'][i]; ++i) {
 771                                         if (isspace(msg->cm_fields['F'][i])) {
 772                                                 msg->cm_fields['F'][i] = '_';
 773                                         }
 774                                 }
 775
 776                                 /*
 777                                  * Figure out how big a buffer we need to allocate
 778                                  */
 779                                 for (nptr = sc->participates; nptr != NULL; nptr = nptr->next) {
 780
 781                                         if (msg->cm_fields['R'] == NULL) {
 782                                                 free(msg->cm_fields['R']);
 783                                         }
 784                                         msg->cm_fields['R'] = strdup(nptr->name);
 785
 786                                         valid = validate_recipients(nptr->name, NULL, 0);
 787                                         CtdlSubmitMsg(msg, valid, "", 0);
 788                                         free_recipients(valid);
 789                                 }
 790
 791                         }
 792                         CtdlFreeMessage(msg);
 793                 }
 794         }
 795
 796         /*
 797          * Process IGnet push shares
 798          */
 799         msg = CtdlFetchMessage(msgnum, 1);
 800         if (msg != NULL) {
 801                 size_t newpath_len;
 802
 803                 /* Prepend our node name to the Path field whenever
 804                  * sending a message to another IGnet node
 805                  */
 806                 if (msg->cm_fields['P'] == NULL) {
 807                         msg->cm_fields['P'] = strdup("username");
 808                 }
 809                 newpath_len = strlen(msg->cm_fields['P']) +
 810                          strlen(config.c_nodename) + 2;
 811                 newpath = malloc(newpath_len);
 812                 snprintf(newpath, newpath_len, "%s!%s",
 813                          config.c_nodename, msg->cm_fields['P']);
 814                 free(msg->cm_fields['P']);
 815                 msg->cm_fields['P'] = newpath;
 816
 817                 /*
 818                  * Determine if this message is set to be deleted
 819                  * after sending out on the network
 820                  */
 821                 if (msg->cm_fields['S'] != NULL) {
 822                         if (!strcasecmp(msg->cm_fields['S'], "CANCEL")) {
 823                                 delete_after_send = 1;
 824                         }
 825                 }
 826
 827                 /* Now send it to every node */
 828                 if (sc->ignet_push_shares != NULL)
 829                   for (mptr = sc->ignet_push_shares; mptr != NULL;
 830                     mptr = mptr->next) {
 831
 832                         send = 1;
 833
 834                         /* Check for valid node name */
 835                         if (is_valid_node(NULL, NULL, mptr->remote_nodename) != 0) {
 836                                 CtdlLogPrintf(CTDL_ERR, "Invalid node <%s>\n", mptr->remote_nodename);
 837                                 send = 0;
 838                         }
 839
 840                         /* Check for split horizon */
 841                         CtdlLogPrintf(CTDL_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 842                         bang = num_tokens(msg->cm_fields['P'], '!');
 843                         if (bang > 1) for (i=0; i<(bang-1); ++i) {
 844                                 extract_token(buf, msg->cm_fields['P'], i, '!', sizeof buf);
 845                                 CtdlLogPrintf(CTDL_DEBUG, "Compare <%s> to <%s>\n",
 846                                         buf, mptr->remote_nodename) ;
 847                                 if (!strcasecmp(buf, mptr->remote_nodename)) {
 848                                         send = 0;
 849                                         CtdlLogPrintf(CTDL_DEBUG, "Not sending to %s\n",
 850                                                 mptr->remote_nodename);
 851                                 }
 852                                 else {
 853                                         CtdlLogPrintf(CTDL_DEBUG, "Sending to %s\n", mptr->remote_nodename);
 854                                 }
 855                         }
 856
 857                         /* Send the message */
 858                         if (send == 1) {
 859
 860                                 /*
 861                                  * Force the message to appear in the correct room
 862                                  * on the far end by setting the C field correctly
 863                                  */
 864                                 if (msg->cm_fields['C'] != NULL) {
 865                                         free(msg->cm_fields['C']);
 866                                 }
 867                                 if (!IsEmptyStr(mptr->remote_roomname)) {
 868                                         msg->cm_fields['C'] = strdup(mptr->remote_roomname);
 869                                 }
 870                                 else {
 871                                         msg->cm_fields['C'] = strdup(CC->room.QRname);
 872                                 }
 873
 874                                 /* serialize it for transmission */
 875                                 serialize_message(&sermsg, msg);
 876                                 if (sermsg.len > 0) {
 877
 878                                         /* write it to the spool file */
 879                                         snprintf(filename, sizeof filename,"%s/%s",
 880                                                         ctdl_netout_dir,
 881                                                         mptr->remote_nodename);
 882                                         CtdlLogPrintf(CTDL_DEBUG, "Appending to %s\n", filename);
 883                                         fp = fopen(filename, "ab");
 884                                         if (fp != NULL) {
 885                                                 fwrite(sermsg.ser,
 886                                                         sermsg.len, 1, fp);
 887                                                 fclose(fp);
 888                                         }
 889                                         else {
 890                                                 CtdlLogPrintf(CTDL_ERR, "%s: %s\n", filename, strerror(errno));
 891                                         }
 892
 893                                         /* free the serialized version */
 894                                         free(sermsg.ser);
 895                                 }
 896
 897                         }
 898                 }
 899                 CtdlFreeMessage(msg);
 900         }
 901
 902         /* update lastsent */
 903         sc->lastsent = msgnum;
 904
 905         /* Delete this message if delete-after-send is set */
 906         if (delete_after_send) {
 907                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 908         }
 909
 910 }
 911
 912
 913 int read_spoolcontrol_file(SpoolControl **scc, char *filename)
 914 {
 915         FILE *fp;
 916         char instr[SIZ];
 917         char buf[SIZ];
 918         char nodename[256];
 919         char roomname[ROOMNAMELEN];
 920         size_t miscsize = 0;
 921         size_t linesize = 0;
 922         int skipthisline = 0;
 923         namelist *nptr = NULL;
 924         maplist *mptr = NULL;
 925         SpoolControl *sc;
 926
 927         fp = fopen(filename, "r");
 928         if (fp == NULL) {
 929                 return 0;
 930         }
 931         sc = malloc(sizeof(SpoolControl));
 932         memset(sc, 0, sizeof(SpoolControl));
 933         *scc = sc;
 934
 935         while (fgets(buf, sizeof buf, fp) != NULL) {
 936                 buf[strlen(buf)-1] = 0;
 937
 938                 extract_token(instr, buf, 0, '|', sizeof instr);
 939                 if (!strcasecmp(instr, strof(lastsent))) {
 940                         sc->lastsent = extract_long(buf, 1);
 941                 }
 942                 else if (!strcasecmp(instr, strof(listrecp))) {
 943                         nptr = (namelist *)
 944                                 malloc(sizeof(namelist));
 945                         nptr->next = sc->listrecps;
 946                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 947                         sc->listrecps = nptr;
 948                 }
 949                 else if (!strcasecmp(instr, strof(participate))) {
 950                         nptr = (namelist *)
 951                                 malloc(sizeof(namelist));
 952                         nptr->next = sc->participates;
 953                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 954                         sc->participates = nptr;
 955                 }
 956                 else if (!strcasecmp(instr, strof(digestrecp))) {
 957                         nptr = (namelist *)
 958                                 malloc(sizeof(namelist));
 959                         nptr->next = sc->digestrecps;
 960                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 961                         sc->digestrecps = nptr;
 962                 }
 963                 else if (!strcasecmp(instr, strof(ignet_push_share))) {
 964                         extract_token(nodename, buf, 1, '|', sizeof nodename);
 965                         extract_token(roomname, buf, 2, '|', sizeof roomname);
 966                         mptr = (maplist *) malloc(sizeof(maplist));
 967                         mptr->next = sc->ignet_push_shares;
 968                         strcpy(mptr->remote_nodename, nodename);
 969                         strcpy(mptr->remote_roomname, roomname);
 970                         sc->ignet_push_shares = mptr;
 971                 }
 972                 else {
 973                         /* Preserve 'other' lines ... *unless* they happen to
 974                          * be subscribe/unsubscribe pendings with expired
 975                          * timestamps.
 976                          */
 977                         skipthisline = 0;
 978                         if (!strncasecmp(buf, strof(subpending)"|", 11)) {
 979                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
 980                                         skipthisline = 1;
 981                                 }
 982                         }
 983                         if (!strncasecmp(buf, strof(unsubpending)"|", 13)) {
 984                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
 985                                         skipthisline = 1;
 986                                 }
 987                         }
 988
 989                         if (skipthisline == 0) {
 990                                 linesize = strlen(buf);
 991                                 sc->misc = realloc(sc->misc,
 992                                         (miscsize + linesize + 2) );
 993                                 sprintf(&sc->misc[miscsize], "%s\n", buf);
 994                                 miscsize = miscsize + linesize + 1;
 995                         }
 996                 }
 997
 998
 999         }
1000         fclose(fp);
1001         return 1;
1002 }
1003
1004 void free_spoolcontrol_struct(SpoolControl **scc)
1005 {
1006         SpoolControl *sc;
1007         namelist *nptr = NULL;
1008         maplist *mptr = NULL;
1009
1010         sc = *scc;
1011         while (sc->listrecps != NULL) {
1012                 nptr = sc->listrecps->next;
1013                 free(sc->listrecps);
1014                 sc->listrecps = nptr;
1015         }
1016         /* Do the same for digestrecps */
1017         while (sc->digestrecps != NULL) {
1018                 nptr = sc->digestrecps->next;
1019                 free(sc->digestrecps);
1020                 sc->digestrecps = nptr;
1021         }
1022         /* Do the same for participates */
1023         while (sc->participates != NULL) {
1024                 nptr = sc->participates->next;
1025                 free(sc->participates);
1026                 sc->participates = nptr;
1027         }
1028         while (sc->ignet_push_shares != NULL) {
1029                 mptr = sc->ignet_push_shares->next;
1030                 free(sc->ignet_push_shares);
1031                 sc->ignet_push_shares = mptr;
1032         }
1033         free(sc->misc);
1034         free(sc);
1035         *scc=NULL;
1036 }
1037
1038 int writenfree_spoolcontrol_file(SpoolControl **scc, char *filename)
1039 {
1040         FILE *fp;
1041         SpoolControl *sc;
1042         namelist *nptr = NULL;
1043         maplist *mptr = NULL;
1044
1045         sc = *scc;
1046         fp = fopen(filename, "w");
1047         if (fp == NULL) {
1048                 CtdlLogPrintf(CTDL_CRIT, "ERROR: cannot open %s: %s\n",
1049                         filename, strerror(errno));
1050                 free_spoolcontrol_struct(scc);
1051         }
1052         else {
1053                 fprintf(fp, "lastsent|%ld\n", sc->lastsent);
1054
1055                 /* Write out the listrecps while freeing from memory at the
1056                  * same time.  Am I clever or what?  :)
1057                  */
1058                 while (sc->listrecps != NULL) {
1059                         fprintf(fp, "listrecp|%s\n", sc->listrecps->name);
1060                         nptr = sc->listrecps->next;
1061                         free(sc->listrecps);
1062                         sc->listrecps = nptr;
1063                 }
1064                 /* Do the same for digestrecps */
1065                 while (sc->digestrecps != NULL) {
1066                         fprintf(fp, "digestrecp|%s\n", sc->digestrecps->name);
1067                         nptr = sc->digestrecps->next;
1068                         free(sc->digestrecps);
1069                         sc->digestrecps = nptr;
1070                 }
1071                 /* Do the same for participates */
1072                 while (sc->participates != NULL) {
1073                         fprintf(fp, "participate|%s\n", sc->participates->name);
1074                         nptr = sc->participates->next;
1075                         free(sc->participates);
1076                         sc->participates = nptr;
1077                 }
1078                 while (sc->ignet_push_shares != NULL) {
1079                         fprintf(fp, "ignet_push_share|%s", sc->ignet_push_shares->remote_nodename);
1080                         if (!IsEmptyStr(sc->ignet_push_shares->remote_roomname)) {
1081                                 fprintf(fp, "|%s", sc->ignet_push_shares->remote_roomname);
1082                         }
1083                         fprintf(fp, "\n");
1084                         mptr = sc->ignet_push_shares->next;
1085                         free(sc->ignet_push_shares);
1086                         sc->ignet_push_shares = mptr;
1087                 }
1088                 if (sc->misc != NULL) {
1089                         fwrite(sc->misc, strlen(sc->misc), 1, fp);
1090                 }
1091                 free(sc->misc);
1092
1093                 fclose(fp);
1094                 free(sc);
1095                 *scc=NULL;
1096         }
1097         return 1;
1098 }
1099 int is_recipient(SpoolControl *sc, const char *Name)
1100 {
1101         namelist *nptr;
1102         size_t len;
1103
1104         len = strlen(Name);
1105         nptr = sc->listrecps;
1106         while (nptr != NULL) {
1107                 if (strncmp(Name, nptr->name, len)==0)
1108                         return 1;
1109                 nptr = nptr->next;
1110         }
1111         /* Do the same for digestrecps */
1112         nptr = sc->digestrecps;
1113         while (nptr != NULL) {
1114                 if (strncmp(Name, nptr->name, len)==0)
1115                         return 1;
1116                 nptr = nptr->next;
1117         }
1118         /* Do the same for participates */
1119         nptr = sc->participates;
1120         while (nptr != NULL) {
1121                 if (strncmp(Name, nptr->name, len)==0)
1122                         return 1;
1123                 nptr = nptr->next;
1124         }
1125         return 0;
1126 }
1127
1128
1129 /*
1130  * Batch up and send all outbound traffic from the current room
1131  */
1132 void network_spoolout_room(char *room_to_spool) {
1133         char buf[SIZ];
1134         char filename[PATH_MAX];
1135         SpoolControl *sc;
1136         int i;
1137
1138         /*
1139          * If the room doesn't exist, don't try to perform its networking tasks.
1140          * Normally this should never happen, but once in a while maybe a room gets
1141          * queued for networking and then deleted before it can happen.
1142          */
1143         if (CtdlGetRoom(&CC->room, room_to_spool) != 0) {
1144                 CtdlLogPrintf(CTDL_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
1145                 return;
1146         }
1147
1148         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1149         begin_critical_section(S_NETCONFIGS);
1150
1151         /* Only do net processing for rooms that have netconfigs */
1152         if (!read_spoolcontrol_file(&sc, filename))
1153         {
1154                 end_critical_section(S_NETCONFIGS);
1155                 return;
1156         }
1157         CtdlLogPrintf(CTDL_INFO, "Networking started for <%s>\n", CC->room.QRname);
1158
1159         /* If there are digest recipients, we have to build a digest */
1160         if (sc->digestrecps != NULL) {
1161                 sc->digestfp = tmpfile();
1162                 fprintf(sc->digestfp, "Content-type: text/plain\n\n");
1163         }
1164
1165         /* Do something useful */
1166         CtdlForEachMessage(MSGS_GT, sc->lastsent, NULL, NULL, NULL,
1167                 network_spool_msg, sc);
1168
1169         /* If we wrote a digest, deliver it and then close it */
1170         snprintf(buf, sizeof buf, "room_%s@%s",
1171                 CC->room.QRname, config.c_fqdn);
1172         for (i=0; buf[i]; ++i) {
1173                 buf[i] = tolower(buf[i]);
1174                 if (isspace(buf[i])) buf[i] = '_';
1175         }
1176         if (sc->digestfp != NULL) {
1177                 fprintf(sc->digestfp,   " -----------------------------------"
1178                                         "------------------------------------"
1179                                         "-------\n"
1180                                         "You are subscribed to the '%s' "
1181                                         "list.\n"
1182                                         "To post to the list: %s\n",
1183                                         CC->room.QRname, buf
1184                 );
1185                 network_deliver_digest(sc);     /* deliver and close */
1186         }
1187
1188         /* Now rewrite the config file */
1189         writenfree_spoolcontrol_file (&sc, filename);
1190         end_critical_section(S_NETCONFIGS);
1191 }
1192
1193
1194
1195 /*
1196  * Send the *entire* contents of the current room to one specific network node,
1197  * ignoring anything we know about which messages have already undergone
1198  * network processing.  This can be used to bring a new node into sync.
1199  */
1200 int network_sync_to(char *target_node) {
1201         SpoolControl sc;
1202         int num_spooled = 0;
1203         int found_node = 0;
1204         char buf[256];
1205         char sc_type[256];
1206         char sc_node[256];
1207         char sc_room[256];
1208         char filename[PATH_MAX];
1209         FILE *fp;
1210
1211         /* Grab the configuration line we're looking for */
1212         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1213         begin_critical_section(S_NETCONFIGS);
1214         fp = fopen(filename, "r");
1215         if (fp == NULL) {
1216                 end_critical_section(S_NETCONFIGS);
1217                 return(-1);
1218         }
1219         while (fgets(buf, sizeof buf, fp) != NULL) {
1220                 buf[strlen(buf)-1] = 0;
1221                 extract_token(sc_type, buf, 0, '|', sizeof sc_type);
1222                 extract_token(sc_node, buf, 1, '|', sizeof sc_node);
1223                 extract_token(sc_room, buf, 2, '|', sizeof sc_room);
1224                 if ( (!strcasecmp(sc_type, "ignet_push_share"))
1225                    && (!strcasecmp(sc_node, target_node)) ) {
1226                         found_node = 1;
1227
1228                         /* Concise syntax because we don't need a full linked-list */
1229                         memset(&sc, 0, sizeof(SpoolControl));
1230                         sc.ignet_push_shares = (maplist *)
1231                                 malloc(sizeof(maplist));
1232                         sc.ignet_push_shares->next = NULL;
1233                         safestrncpy(sc.ignet_push_shares->remote_nodename,
1234                                 sc_node,
1235                                 sizeof sc.ignet_push_shares->remote_nodename);
1236                         safestrncpy(sc.ignet_push_shares->remote_roomname,
1237                                 sc_room,
1238                                 sizeof sc.ignet_push_shares->remote_roomname);
1239                 }
1240         }
1241         fclose(fp);
1242         end_critical_section(S_NETCONFIGS);
1243
1244         if (!found_node) return(-1);
1245
1246         /* Send ALL messages */
1247         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL,
1248                 network_spool_msg, &sc);
1249
1250         /* Concise cleanup because we know there's only one node in the sc */
1251         free(sc.ignet_push_shares);
1252
1253         CtdlLogPrintf(CTDL_NOTICE, "Synchronized %d messages to <%s>\n",
1254                 num_spooled, target_node);
1255         return(num_spooled);
1256 }
1257
1258
1259 /*
1260  * Implements the NSYN command
1261  */
1262 void cmd_nsyn(char *argbuf) {
1263         int num_spooled;
1264         char target_node[256];
1265
1266         if (CtdlAccessCheck(ac_aide)) return;
1267
1268         extract_token(target_node, argbuf, 0, '|', sizeof target_node);
1269         num_spooled = network_sync_to(target_node);
1270         if (num_spooled >= 0) {
1271                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
1272         }
1273         else {
1274                 cprintf("%d No such room/node share exists.\n",
1275                         ERROR + ROOM_NOT_FOUND);
1276         }
1277 }
1278
1279
1280
1281 /*
1282  * Batch up and send all outbound traffic from the current room
1283  */
1284 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
1285         struct RoomProcList *ptr;
1286
1287         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
1288         if (ptr == NULL) return;
1289
1290         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
1291         begin_critical_section(S_RPLIST);
1292         ptr->next = rplist;
1293         rplist = ptr;
1294         end_critical_section(S_RPLIST);
1295 }
1296
1297 void destroy_network_queue_room(void)
1298 {
1299         struct RoomProcList *cur, *p;
1300         NetMap *nmcur, *nmp;
1301
1302         cur = rplist;
1303         begin_critical_section(S_RPLIST);
1304         while (cur != NULL)
1305         {
1306                 p = cur->next;
1307                 free (cur);
1308                 cur = p;
1309         }
1310         rplist = NULL;
1311         end_critical_section(S_RPLIST);
1312
1313         nmcur = the_netmap;
1314         while (nmcur != NULL)
1315         {
1316                 nmp = nmcur->next;
1317                 free (nmcur);
1318                 nmcur = nmp;
1319         }
1320         the_netmap = NULL;
1321         if (working_ignetcfg != NULL)
1322                 free (working_ignetcfg);
1323         working_ignetcfg = NULL;
1324 }
1325
1326
1327 /*
1328  * Learn topology from path fields
1329  */
1330 void network_learn_topology(char *node, char *path) {
1331         char nexthop[256];
1332         NetMap *nmptr;
1333
1334         strcpy(nexthop, "");
1335
1336         if (num_tokens(path, '!') < 3) return;
1337         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
1338                 if (!strcasecmp(nmptr->nodename, node)) {
1339                         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1340                         nmptr->lastcontact = time(NULL);
1341                         ++netmap_changed;
1342                         return;
1343                 }
1344         }
1345
1346         /* If we got here then it's not in the map, so add it. */
1347         nmptr = (NetMap *) malloc(sizeof (NetMap));
1348         strcpy(nmptr->nodename, node);
1349         nmptr->lastcontact = time(NULL);
1350         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1351         nmptr->next = the_netmap;
1352         the_netmap = nmptr;
1353         ++netmap_changed;
1354 }
1355
1356
1357
1358
1359 /*
1360  * Bounce a message back to the sender
1361  */
1362 void network_bounce(struct CtdlMessage *msg, char *reason) {
1363         char *oldpath = NULL;
1364         char buf[SIZ];
1365         char bouncesource[SIZ];
1366         char recipient[SIZ];
1367         struct recptypes *valid = NULL;
1368         char force_room[ROOMNAMELEN];
1369         static int serialnum = 0;
1370         size_t size;
1371
1372         CtdlLogPrintf(CTDL_DEBUG, "entering network_bounce()\n");
1373
1374         if (msg == NULL) return;
1375
1376         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
1377
1378         /*
1379          * Give it a fresh message ID
1380          */
1381         if (msg->cm_fields['I'] != NULL) {
1382                 free(msg->cm_fields['I']);
1383         }
1384         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
1385                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
1386         msg->cm_fields['I'] = strdup(buf);
1387
1388         /*
1389          * FIXME ... right now we're just sending a bounce; we really want to
1390          * include the text of the bounced message.
1391          */
1392         if (msg->cm_fields['M'] != NULL) {
1393                 free(msg->cm_fields['M']);
1394         }
1395         msg->cm_fields['M'] = strdup(reason);
1396         msg->cm_format_type = 0;
1397
1398         /*
1399          * Turn the message around
1400          */
1401         if (msg->cm_fields['R'] == NULL) {
1402                 free(msg->cm_fields['R']);
1403         }
1404
1405         if (msg->cm_fields['D'] == NULL) {
1406                 free(msg->cm_fields['D']);
1407         }
1408
1409         snprintf(recipient, sizeof recipient, "%s@%s",
1410                 msg->cm_fields['A'], msg->cm_fields['N']);
1411
1412         if (msg->cm_fields['A'] == NULL) {
1413                 free(msg->cm_fields['A']);
1414         }
1415
1416         if (msg->cm_fields['N'] == NULL) {
1417                 free(msg->cm_fields['N']);
1418         }
1419
1420         if (msg->cm_fields['U'] == NULL) {
1421                 free(msg->cm_fields['U']);
1422         }
1423
1424         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1425         msg->cm_fields['N'] = strdup(config.c_nodename);
1426         msg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
1427
1428         /* prepend our node to the path */
1429         if (msg->cm_fields['P'] != NULL) {
1430                 oldpath = msg->cm_fields['P'];
1431                 msg->cm_fields['P'] = NULL;
1432         }
1433         else {
1434                 oldpath = strdup("unknown_user");
1435         }
1436         size = strlen(oldpath) + SIZ;
1437         msg->cm_fields['P'] = malloc(size);
1438         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1439         free(oldpath);
1440
1441         /* Now submit the message */
1442         valid = validate_recipients(recipient, NULL, 0);
1443         if (valid != NULL) if (valid->num_error != 0) {
1444                 free_recipients(valid);
1445                 valid = NULL;
1446         }
1447         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1448                 strcpy(force_room, config.c_aideroom);
1449         }
1450         else {
1451                 strcpy(force_room, "");
1452         }
1453         if ( (valid == NULL) && IsEmptyStr(force_room) ) {
1454                 strcpy(force_room, config.c_aideroom);
1455         }
1456         CtdlSubmitMsg(msg, valid, force_room, 0);
1457
1458         /* Clean up */
1459         if (valid != NULL) free_recipients(valid);
1460         CtdlFreeMessage(msg);
1461         CtdlLogPrintf(CTDL_DEBUG, "leaving network_bounce()\n");
1462 }
1463
1464
1465
1466
1467 /*
1468  * Process a buffer containing a single message from a single file
1469  * from the inbound queue
1470  */
1471 void network_process_buffer(char *buffer, long size) {
1472         struct CtdlMessage *msg = NULL;
1473         long pos;
1474         int field;
1475         struct recptypes *recp = NULL;
1476         char target_room[ROOMNAMELEN];
1477         struct ser_ret sermsg;
1478         char *oldpath = NULL;
1479         char filename[PATH_MAX];
1480         FILE *fp;
1481         char nexthop[SIZ];
1482         unsigned char firstbyte;
1483         unsigned char lastbyte;
1484
1485         CtdlLogPrintf(CTDL_DEBUG, "network_process_buffer() processing %ld bytes\n", size);
1486
1487         /* Validate just a little bit.  First byte should be FF and * last byte should be 00. */
1488         firstbyte = buffer[0];
1489         lastbyte = buffer[size-1];
1490         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1491                 CtdlLogPrintf(CTDL_ERR, "Corrupt message ignored.  Length=%ld, firstbyte = %d, lastbyte = %d\n",
1492                         size, firstbyte, lastbyte);
1493                 return;
1494         }
1495
1496         /* Set default target room to trash */
1497         strcpy(target_room, TWITROOM);
1498
1499         /* Load the message into memory */
1500         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1501         memset(msg, 0, sizeof(struct CtdlMessage));
1502         msg->cm_magic = CTDLMESSAGE_MAGIC;
1503         msg->cm_anon_type = buffer[1];
1504         msg->cm_format_type = buffer[2];
1505
1506         for (pos = 3; pos < size; ++pos) {
1507                 field = buffer[pos];
1508                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1509                 pos = pos + strlen(&buffer[(int)pos]);
1510         }
1511
1512         /* Check for message routing */
1513         if (msg->cm_fields['D'] != NULL) {
1514                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1515
1516                         /* route the message */
1517                         strcpy(nexthop, "");
1518                         if (is_valid_node(nexthop, NULL, msg->cm_fields['D']) == 0) {
1519                                 /* prepend our node to the path */
1520                                 if (msg->cm_fields['P'] != NULL) {
1521                                         oldpath = msg->cm_fields['P'];
1522                                         msg->cm_fields['P'] = NULL;
1523                                 }
1524                                 else {
1525                                         oldpath = strdup("unknown_user");
1526                                 }
1527                                 size = strlen(oldpath) + SIZ;
1528                                 msg->cm_fields['P'] = malloc(size);
1529                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1530                                         config.c_nodename, oldpath);
1531                                 free(oldpath);
1532
1533                                 /* serialize the message */
1534                                 serialize_message(&sermsg, msg);
1535
1536                                 /* now send it */
1537                                 if (IsEmptyStr(nexthop)) {
1538                                         strcpy(nexthop, msg->cm_fields['D']);
1539                                 }
1540                                 snprintf(filename,
1541                                                  sizeof filename,
1542                                                  "%s/%s",
1543                                                  ctdl_netout_dir,
1544                                                  nexthop);
1545                                 CtdlLogPrintf(CTDL_DEBUG, "Appending to %s\n", filename);
1546                                 fp = fopen(filename, "ab");
1547                                 if (fp != NULL) {
1548                                         fwrite(sermsg.ser,
1549                                                 sermsg.len, 1, fp);
1550                                         fclose(fp);
1551                                 }
1552                                 else {
1553                                         CtdlLogPrintf(CTDL_ERR, "%s: %s\n", filename, strerror(errno));
1554                                 }
1555                                 free(sermsg.ser);
1556                                 CtdlFreeMessage(msg);
1557                                 return;
1558                         }
1559
1560                         else {  /* invalid destination node name */
1561
1562                                 network_bounce(msg,
1563 "A message you sent could not be delivered due to an invalid destination node"
1564 " name.  Please check the address and try sending the message again.\n");
1565                                 msg = NULL;
1566                                 return;
1567
1568                         }
1569                 }
1570         }
1571
1572         /*
1573          * Check to see if we already have a copy of this message, and
1574          * abort its processing if so.  (We used to post a warning to Aide>
1575          * every time this happened, but the network is now so densely
1576          * connected that it's inevitable.)
1577          */
1578         if (network_usetable(msg) != 0) {
1579                 CtdlFreeMessage(msg);
1580                 return;
1581         }
1582
1583         /* Learn network topology from the path */
1584         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1585                 network_learn_topology(msg->cm_fields['N'], msg->cm_fields['P']);
1586         }
1587
1588         /* Is the sending node giving us a very persuasive suggestion about
1589          * which room this message should be saved in?  If so, go with that.
1590          */
1591         if (msg->cm_fields['C'] != NULL) {
1592                 safestrncpy(target_room, msg->cm_fields['C'], sizeof target_room);
1593         }
1594
1595         /* Otherwise, does it have a recipient?  If so, validate it... */
1596         else if (msg->cm_fields['R'] != NULL) {
1597                 recp = validate_recipients(msg->cm_fields['R'], NULL, 0);
1598                 if (recp != NULL) if (recp->num_error != 0) {
1599                         network_bounce(msg,
1600                                 "A message you sent could not be delivered due to an invalid address.\n"
1601                                 "Please check the address and try sending the message again.\n");
1602                         msg = NULL;
1603                         free_recipients(recp);
1604                         CtdlLogPrintf(CTDL_DEBUG, "Bouncing message due to invalid recipient address.\n");
1605                         return;
1606                 }
1607                 strcpy(target_room, "");        /* no target room if mail */
1608         }
1609
1610         /* Our last shot at finding a home for this message is to see if
1611          * it has the O field (Originating room) set.
1612          */
1613         else if (msg->cm_fields['O'] != NULL) {
1614                 safestrncpy(target_room, msg->cm_fields['O'], sizeof target_room);
1615         }
1616
1617         /* Strip out fields that are only relevant during transit */
1618         if (msg->cm_fields['D'] != NULL) {
1619                 free(msg->cm_fields['D']);
1620                 msg->cm_fields['D'] = NULL;
1621         }
1622         if (msg->cm_fields['C'] != NULL) {
1623                 free(msg->cm_fields['C']);
1624                 msg->cm_fields['C'] = NULL;
1625         }
1626
1627         /* save the message into a room */
1628         if (PerformNetprocHooks(msg, target_room) == 0) {
1629                 msg->cm_flags = CM_SKIP_HOOKS;
1630                 CtdlSubmitMsg(msg, recp, target_room, 0);
1631         }
1632         CtdlFreeMessage(msg);
1633         free_recipients(recp);
1634 }
1635
1636
1637 /*
1638  * Process a single message from a single file from the inbound queue
1639  */
1640 void network_process_message(FILE *fp, long msgstart, long msgend) {
1641         long hold_pos;
1642         long size;
1643         char *buffer;
1644
1645         hold_pos = ftell(fp);
1646         size = msgend - msgstart + 1;
1647         buffer = malloc(size);
1648         if (buffer != NULL) {
1649                 fseek(fp, msgstart, SEEK_SET);
1650                 if (fread(buffer, size, 1, fp) > 0) {
1651                         network_process_buffer(buffer, size);
1652                 }
1653                 free(buffer);
1654         }
1655
1656         fseek(fp, hold_pos, SEEK_SET);
1657 }
1658
1659
1660 /*
1661  * Process a single file from the inbound queue
1662  */
1663 void network_process_file(char *filename) {
1664         FILE *fp;
1665         long msgstart = (-1L);
1666         long msgend = (-1L);
1667         long msgcur = 0L;
1668         int ch;
1669
1670
1671         fp = fopen(filename, "rb");
1672         if (fp == NULL) {
1673                 CtdlLogPrintf(CTDL_CRIT, "Error opening %s: %s\n", filename, strerror(errno));
1674                 return;
1675         }
1676
1677         fseek(fp, 0L, SEEK_END);
1678         CtdlLogPrintf(CTDL_INFO, "network: processing %ld bytes from %s\n", ftell(fp), filename);
1679         rewind(fp);
1680
1681         /* Look for messages in the data stream and break them out */
1682         while (ch = getc(fp), ch >= 0) {
1683
1684                 if (ch == 255) {
1685                         if (msgstart >= 0L) {
1686                                 msgend = msgcur - 1;
1687                                 network_process_message(fp, msgstart, msgend);
1688                         }
1689                         msgstart = msgcur;
1690                 }
1691
1692                 ++msgcur;
1693         }
1694
1695         msgend = msgcur - 1;
1696         if (msgstart >= 0L) {
1697                 network_process_message(fp, msgstart, msgend);
1698         }
1699
1700         fclose(fp);
1701         unlink(filename);
1702 }
1703
1704
1705 /*
1706  * Process anything in the inbound queue
1707  */
1708 void network_do_spoolin(void) {
1709         DIR *dp;
1710         struct dirent *d;
1711         struct stat statbuf;
1712         char filename[PATH_MAX];
1713         static time_t last_spoolin_mtime = 0L;
1714
1715         /*
1716          * Check the spoolin directory's modification time.  If it hasn't
1717          * been touched, we don't need to scan it.
1718          */
1719         if (stat(ctdl_netin_dir, &statbuf)) return;
1720         if (statbuf.st_mtime == last_spoolin_mtime) {
1721                 CtdlLogPrintf(CTDL_DEBUG, "network: nothing in inbound queue\n");
1722                 return;
1723         }
1724         last_spoolin_mtime = statbuf.st_mtime;
1725         CtdlLogPrintf(CTDL_DEBUG, "network: processing inbound queue\n");
1726
1727         /*
1728          * Ok, there's something interesting in there, so scan it.
1729          */
1730         dp = opendir(ctdl_netin_dir);
1731         if (dp == NULL) return;
1732
1733         while (d = readdir(dp), d != NULL) {
1734                 if ((strcmp(d->d_name, ".")) && (strcmp(d->d_name, ".."))) {
1735                         snprintf(filename,
1736                                          sizeof filename,
1737                                          "%s/%s",
1738                                          ctdl_netin_dir,
1739                                          d->d_name);
1740                         network_process_file(filename);
1741                 }
1742         }
1743
1744         closedir(dp);
1745 }
1746
1747 /*
1748  * Delete any files in the outbound queue that were intended
1749  * to be sent to nodes which no longer exist.
1750  */
1751 void network_purge_spoolout(void) {
1752         DIR *dp;
1753         struct dirent *d;
1754         char filename[PATH_MAX];
1755         char nexthop[256];
1756         int i;
1757
1758         dp = opendir(ctdl_netout_dir);
1759         if (dp == NULL) return;
1760
1761         while (d = readdir(dp), d != NULL) {
1762                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
1763                         continue;
1764                 snprintf(filename,
1765                                  sizeof filename,
1766                                  "%s/%s",
1767                                  ctdl_netout_dir,
1768                                  d->d_name);
1769
1770                 strcpy(nexthop, "");
1771                 i = is_valid_node(nexthop, NULL, d->d_name);
1772
1773                 if ( (i != 0) || !IsEmptyStr(nexthop) ) {
1774                         unlink(filename);
1775                 }
1776         }
1777
1778
1779         closedir(dp);
1780 }
1781
1782
1783 /*
1784  * receive network spool from the remote system
1785  */
1786 void receive_spool(int *sock, char *remote_nodename) {
1787         size_t siz;
1788         long download_len = 0L;
1789         long bytes_received = 0L;
1790         long bytes_copied = 0L;
1791         char buf[SIZ];
1792         static char pbuf[IGNET_PACKET_SIZE];
1793         char tempfilename[PATH_MAX];
1794         char filename[PATH_MAX];
1795         long plen;
1796         FILE *fp, *newfp;
1797
1798         CtdlMakeTempFileName(tempfilename, sizeof tempfilename);
1799         if (sock_puts(sock, "NDOP") < 0) return;
1800         if (sock_getln(sock, buf, sizeof buf) < 0) return;
1801         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1802         if (buf[0] != '2') {
1803                 return;
1804         }
1805         download_len = extract_long(&buf[4], 0);
1806
1807         bytes_received = 0L;
1808         fp = fopen(tempfilename, "w");
1809         if (fp == NULL) {
1810                 CtdlLogPrintf(CTDL_CRIT, "cannot open download file locally: %s\n",
1811                         strerror(errno));
1812                 return;
1813         }
1814
1815         while (bytes_received < download_len) {
1816                 /**
1817                  * If shutting down we can exit here and unlink the temp file.
1818                  * this shouldn't loose us any messages.
1819                  */
1820                 if (CtdlThreadCheckStop())
1821                 {
1822                         fclose(fp);
1823                         unlink(tempfilename);
1824                         return;
1825                 }
1826                 snprintf(buf, sizeof buf, "READ %ld|%ld",
1827                         bytes_received,
1828                      ((download_len - bytes_received > IGNET_PACKET_SIZE)
1829                  ? IGNET_PACKET_SIZE : (download_len - bytes_received)));
1830                 if (sock_puts(sock, buf) < 0) {
1831                         fclose(fp);
1832                         unlink(tempfilename);
1833                         return;
1834                 }
1835                 if (sock_getln(sock, buf, sizeof buf) < 0) {
1836                         fclose(fp);
1837                         unlink(tempfilename);
1838                         return;
1839                 }
1840                 if (buf[0] == '6') {
1841                         plen = extract_long(&buf[4], 0);
1842                         if (sock_read(sock, pbuf, plen, 1) < 0) {
1843                                 fclose(fp);
1844                                 unlink(tempfilename);
1845                                 return;
1846                         }
1847                         fwrite((char *) pbuf, plen, 1, fp);
1848                         bytes_received = bytes_received + plen;
1849                 }
1850         }
1851
1852         fclose(fp);
1853         /** Last chance for shutdown exit */
1854         if (CtdlThreadCheckStop())
1855         {
1856                 unlink(tempfilename);
1857                 return;
1858         }
1859         if (sock_puts(sock, "CLOS") < 0) {
1860                 unlink(tempfilename);
1861                 return;
1862         }
1863         /**
1864          * From here on we must complete or messages will get lost
1865          */
1866         if (sock_getln(sock, buf, sizeof buf) < 0) {
1867                 unlink(tempfilename);
1868                 return;
1869         }
1870         if (download_len > 0) {
1871                 CtdlLogPrintf(CTDL_NOTICE, "Received %ld octets from <%s>\n", download_len, remote_nodename);
1872         }
1873         CtdlLogPrintf(CTDL_DEBUG, "%s\n", buf);
1874
1875         /* Now copy the temp file to its permanent location.
1876          * (We copy instead of link because they may be on different filesystems)
1877          */
1878         begin_critical_section(S_NETSPOOL);
1879         snprintf(filename,
1880                          sizeof filename,
1881                          "%s/%s.%ld",
1882                          ctdl_netin_dir,
1883                          remote_nodename,
1884                          (long) getpid()
1885         );
1886         fp = fopen(tempfilename, "r");
1887         if (fp != NULL) {
1888                 newfp = fopen(filename, "w");
1889                 if (newfp != NULL) {
1890                         bytes_copied = 0L;
1891                         while (bytes_copied < download_len) {
1892                                 plen = download_len - bytes_copied;
1893                                 if (plen > sizeof buf) {
1894                                         plen = sizeof buf;
1895                                 }
1896                                 siz = fread(buf, plen, 1, fp);
1897                                 fwrite(buf, plen, 1, newfp);
1898                                 bytes_copied += plen;
1899                         }
1900                         fclose(newfp);
1901                 }
1902                 fclose(fp);
1903         }
1904         end_critical_section(S_NETSPOOL);
1905         unlink(tempfilename);
1906 }
1907
1908
1909
1910 /*
1911  * transmit network spool to the remote system
1912  */
1913 void transmit_spool(int *sock, char *remote_nodename)
1914 {
1915         char buf[SIZ];
1916         char pbuf[4096];
1917         long plen;
1918         long bytes_to_write, thisblock, bytes_written;
1919         int fd;
1920         char sfname[128];
1921
1922         if (sock_puts(sock, "NUOP") < 0) return;
1923         if (sock_getln(sock, buf, sizeof buf) < 0) return;
1924         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1925         if (buf[0] != '2') {
1926                 return;
1927         }
1928
1929         snprintf(sfname, sizeof sfname,
1930                          "%s/%s",
1931                          ctdl_netout_dir,
1932                          remote_nodename);
1933         fd = open(sfname, O_RDONLY);
1934         if (fd < 0) {
1935                 if (errno != ENOENT) {
1936                         CtdlLogPrintf(CTDL_CRIT, "cannot open upload file locally: %s\n",
1937                                 strerror(errno));
1938                 }
1939                 return;
1940         }
1941         bytes_written = 0;
1942         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
1943                 bytes_to_write = plen;
1944                 while (bytes_to_write > 0L) {
1945                         /** Exit if shutting down */
1946                         if (CtdlThreadCheckStop())
1947                         {
1948                                 close(fd);
1949                                 return;
1950                         }
1951
1952                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
1953                         if (sock_puts(sock, buf) < 0) {
1954                                 close(fd);
1955                                 return;
1956                         }
1957                         if (sock_getln(sock, buf, sizeof buf) < 0) {
1958                                 close(fd);
1959                                 return;
1960                         }
1961                         thisblock = atol(&buf[4]);
1962                         if (buf[0] == '7') {
1963                                 if (sock_write(sock, pbuf,
1964                                    (int) thisblock) < 0) {
1965                                         close(fd);
1966                                         return;
1967                                 }
1968                                 bytes_to_write -= thisblock;
1969                                 bytes_written += thisblock;
1970                         } else {
1971                                 goto ABORTUPL;
1972                         }
1973                 }
1974         }
1975
1976 ABORTUPL:
1977         close(fd);
1978         /** Last chance for shutdown exit */
1979         if(CtdlThreadCheckStop())
1980                 return;
1981
1982         if (sock_puts(sock, "UCLS 1") < 0) return;
1983         /**
1984          * From here on we must complete or messages will get lost
1985          */
1986         if (sock_getln(sock, buf, sizeof buf) < 0) return;
1987         CtdlLogPrintf(CTDL_NOTICE, "Sent %ld octets to <%s>\n",
1988                         bytes_written, remote_nodename);
1989         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1990         if (buf[0] == '2') {
1991                 CtdlLogPrintf(CTDL_DEBUG, "Removing <%s>\n", sfname);
1992                 unlink(sfname);
1993         }
1994 }
1995
1996
1997
1998 /*
1999  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
2000  */
2001 void network_poll_node(char *node, char *secret, char *host, char *port) {
2002         int sock;
2003         char buf[SIZ];
2004         char err_buf[SIZ];
2005         char connected_to[SIZ];
2006         CitContext *CCC=CC;
2007
2008         if (network_talking_to(node, NTT_CHECK)) return;
2009         network_talking_to(node, NTT_ADD);
2010         CtdlLogPrintf(CTDL_NOTICE, "Connecting to <%s> at %s:%s\n", node, host, port);
2011
2012         sock = sock_connect(host, port, "tcp");
2013         if (sock < 0) {
2014                 CtdlLogPrintf(CTDL_ERR, "Could not connect: %s\n", strerror(errno));
2015                 network_talking_to(node, NTT_REMOVE);
2016                 return;
2017         }
2018
2019         CtdlLogPrintf(CTDL_DEBUG, "Connected!\n");
2020         CCC->sReadBuf = NewStrBuf();
2021         CCC->sMigrateBuf = NewStrBuf();
2022         CCC->sPos = NULL;
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:
2053         FreeStrBuf(&CCC->sReadBuf);
2054         FreeStrBuf(&CCC->sMigrateBuf);
2055         if (sock != -1)
2056                 sock_close(sock);
2057         network_talking_to(node, NTT_REMOVE);
2058 }
2059
2060
2061
2062 /*
2063  * Poll other Citadel nodes and transfer inbound/outbound network data.
2064  * Set "full" to nonzero to force a poll of every node, or to zero to poll
2065  * only nodes to which we have data to send.
2066  */
2067 void network_poll_other_citadel_nodes(int full_poll) {
2068         int i;
2069         char linebuf[256];
2070         char node[SIZ];
2071         char host[256];
2072         char port[256];
2073         char secret[256];
2074         int poll = 0;
2075         char spoolfile[256];
2076
2077         if (working_ignetcfg == NULL) {
2078                 CtdlLogPrintf(CTDL_DEBUG, "No nodes defined - not polling\n");
2079                 return;
2080         }
2081
2082         /* Use the string tokenizer to grab one line at a time */
2083         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
2084                 if(CtdlThreadCheckStop())
2085                         return;
2086                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
2087                 extract_token(node, linebuf, 0, '|', sizeof node);
2088                 extract_token(secret, linebuf, 1, '|', sizeof secret);
2089                 extract_token(host, linebuf, 2, '|', sizeof host);
2090                 extract_token(port, linebuf, 3, '|', sizeof port);
2091                 if ( !IsEmptyStr(node) && !IsEmptyStr(secret)
2092                    && !IsEmptyStr(host) && !IsEmptyStr(port)) {
2093                         poll = full_poll;
2094                         if (poll == 0) {
2095                                 snprintf(spoolfile,
2096                                                  sizeof spoolfile,
2097                                                  "%s/%s",
2098                                                  ctdl_netout_dir,
2099                                                  node);
2100                                 if (access(spoolfile, R_OK) == 0) {
2101                                         poll = 1;
2102                                 }
2103                         }
2104                         if (poll) {
2105                                 network_poll_node(node, secret, host, port);
2106                         }
2107                 }
2108         }
2109
2110 }
2111
2112
2113
2114
2115 /*
2116  * It's ok if these directories already exist.  Just fail silently.
2117  */
2118 void create_spool_dirs(void) {
2119         if ((mkdir(ctdl_spool_dir, 0700) != 0) && (errno != EEXIST))
2120                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_spool_dir, strerror(errno));
2121         if (chown(ctdl_spool_dir, CTDLUID, (-1)) != 0)
2122                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_spool_dir, strerror(errno));
2123         if ((mkdir(ctdl_netin_dir, 0700) != 0) && (errno != EEXIST))
2124                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_netin_dir, strerror(errno));
2125         if (chown(ctdl_netin_dir, CTDLUID, (-1)) != 0)
2126                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netin_dir, strerror(errno));
2127         if ((mkdir(ctdl_netout_dir, 0700) != 0) && (errno != EEXIST))
2128                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_netout_dir, strerror(errno));
2129         if (chown(ctdl_netout_dir, CTDLUID, (-1)) != 0)
2130                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netout_dir, strerror(errno));
2131 }
2132
2133
2134
2135
2136
2137 /*
2138  * network_do_queue()
2139  *
2140  * Run through the rooms doing various types of network stuff.
2141  */
2142 void *network_do_queue(void *args) {
2143         static time_t last_run = 0L;
2144         struct RoomProcList *ptr;
2145         int full_processing = 1;
2146         struct CitContext networkerCC;
2147
2148         /* Give the networker its own private CitContext */
2149         CtdlFillSystemContext(&networkerCC, "network");
2150         citthread_setspecific(MyConKey, (void *)&networkerCC );
2151
2152         /*
2153          * Run the full set of processing tasks no more frequently
2154          * than once every n seconds
2155          */
2156         if ( (time(NULL) - last_run) < config.c_net_freq ) {
2157                 full_processing = 0;
2158                 CtdlLogPrintf(CTDL_DEBUG, "Network full processing in %ld seconds.\n", config.c_net_freq - (time(NULL)- last_run));
2159         }
2160
2161         /*
2162          * This is a simple concurrency check to make sure only one queue run
2163          * is done at a time.  We could do this with a mutex, but since we
2164          * don't really require extremely fine granularity here, we'll do it
2165          * with a static variable instead.
2166          */
2167         if (doing_queue) return NULL;
2168         doing_queue = 1;
2169
2170         /* Load the IGnet Configuration into memory */
2171         load_working_ignetcfg();
2172
2173         /*
2174          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
2175          * then we poll everyone.  Otherwise we only poll nodes we have stuff
2176          * to send to.
2177          */
2178         network_poll_other_citadel_nodes(full_processing);
2179
2180         /*
2181          * Load the network map and filter list into memory.
2182          */
2183         read_network_map();
2184         filterlist = load_filter_list();
2185
2186         /*
2187          * Go ahead and run the queue
2188          */
2189         if (full_processing && !CtdlThreadCheckStop()) {
2190                 CtdlLogPrintf(CTDL_DEBUG, "network: loading outbound queue\n");
2191                 CtdlForEachRoom(network_queue_room, NULL);
2192         }
2193
2194         if (rplist != NULL) {
2195                 CtdlLogPrintf(CTDL_DEBUG, "network: running outbound queue\n");
2196                 while (rplist != NULL && !CtdlThreadCheckStop()) {
2197                         char spoolroomname[ROOMNAMELEN];
2198                         safestrncpy(spoolroomname, rplist->name, sizeof spoolroomname);
2199                         begin_critical_section(S_RPLIST);
2200
2201                         /* pop this record off the list */
2202                         ptr = rplist;
2203                         rplist = rplist->next;
2204                         free(ptr);
2205
2206                         /* invalidate any duplicate entries to prevent double processing */
2207                         for (ptr=rplist; ptr!=NULL; ptr=ptr->next) {
2208                                 if (!strcasecmp(ptr->name, spoolroomname)) {
2209                                         ptr->name[0] = 0;
2210                                 }
2211                         }
2212
2213                         end_critical_section(S_RPLIST);
2214                         if (spoolroomname[0] != 0) {
2215                                 network_spoolout_room(spoolroomname);
2216                         }
2217                 }
2218         }
2219
2220         /* If there is anything in the inbound queue, process it */
2221         if (!CtdlThreadCheckStop())
2222                 network_do_spoolin();
2223
2224         /* Save the network map back to disk */
2225         write_network_map();
2226
2227         /* Free the filter list in memory */
2228         free_filter_list(filterlist);
2229         filterlist = NULL;
2230
2231         network_purge_spoolout();
2232
2233         CtdlLogPrintf(CTDL_DEBUG, "network: queue run completed\n");
2234
2235         if (full_processing) {
2236                 last_run = time(NULL);
2237         }
2238
2239         doing_queue = 0;
2240         if (!CtdlThreadCheckStop()) // Only reschedule if system is not stopping
2241                 CtdlThreadSchedule("IGnet Network", CTDLTHREAD_BIGSTACK, network_do_queue, NULL, time(NULL) + 60);
2242         else
2243                 CtdlLogPrintf(CTDL_DEBUG, "network: Task STOPPED.\n");
2244         return NULL;
2245 }
2246
2247
2248 /*
2249  * cmd_netp() - authenticate to the server as another Citadel node polling
2250  *            for network traffic
2251  */
2252 void cmd_netp(char *cmdbuf)
2253 {
2254         char node[256];
2255         char pass[256];
2256         int v;
2257
2258         char secret[256];
2259         char nexthop[256];
2260         char err_buf[SIZ];
2261
2262         /* Authenticate */
2263         extract_token(node, cmdbuf, 0, '|', sizeof node);
2264         extract_token(pass, cmdbuf, 1, '|', sizeof pass);
2265
2266         if (doing_queue) {
2267                 CtdlLogPrintf(CTDL_WARNING, "Network node <%s> refused - spooling\n", node);
2268                 cprintf("%d spooling - try again in a few minutes\n", ERROR + RESOURCE_BUSY);
2269                 return;
2270         }
2271
2272         /* load the IGnet Configuration to check node validity */
2273         load_working_ignetcfg();
2274         v = is_valid_node(nexthop, secret, node);
2275
2276         if (v != 0) {
2277                 snprintf(err_buf, sizeof err_buf,
2278                         "An unknown Citadel server called \"%s\" attempted to connect from %s [%s].\n",
2279                         node, CC->cs_host, CC->cs_addr
2280                 );
2281                 CtdlLogPrintf(CTDL_WARNING, err_buf);
2282                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2283                 CtdlAideMessage(err_buf, "IGNet Networking.");
2284                 return;
2285         }
2286
2287         if (strcasecmp(pass, secret)) {
2288                 snprintf(err_buf, sizeof err_buf,
2289                         "A Citadel server at %s [%s] failed to authenticate as network node \"%s\".\n",
2290                         CC->cs_host, CC->cs_addr, node
2291                 );
2292                 CtdlLogPrintf(CTDL_WARNING, err_buf);
2293                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2294                 CtdlAideMessage(err_buf, "IGNet Networking.");
2295                 return;
2296         }
2297
2298         if (network_talking_to(node, NTT_CHECK)) {
2299                 CtdlLogPrintf(CTDL_WARNING, "Duplicate session for network node <%s>", node);
2300                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
2301                 return;
2302         }
2303
2304         safestrncpy(CC->net_node, node, sizeof CC->net_node);
2305         network_talking_to(node, NTT_ADD);
2306         CtdlLogPrintf(CTDL_NOTICE, "Network node <%s> logged in from %s [%s]\n",
2307                 CC->net_node, CC->cs_host, CC->cs_addr
2308         );
2309         cprintf("%d authenticated as network node '%s'\n", CIT_OK, CC->net_node);
2310 }
2311
2312
2313 int network_room_handler (struct ctdlroom *room)
2314 {
2315         network_queue_room(room, NULL);
2316         return 0;
2317 }
2318
2319
2320 /*
2321  * Module entry point
2322  */
2323 CTDL_MODULE_INIT(network)
2324 {
2325         if (!threading)
2326         {
2327                 create_spool_dirs();
2328                 CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
2329                 CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
2330                 CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
2331                 CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
2332                 CtdlRegisterRoomHook(network_room_handler);
2333                 CtdlRegisterCleanupHook(destroy_network_queue_room);
2334         }
2335         else
2336                 CtdlThreadSchedule("IGnet Network", CTDLTHREAD_BIGSTACK, network_do_queue, NULL, 0);
2337         /* return our Subversion id for the Log */
2338         return "$Id$";
2339 }