citadel/modules/network/serv_network.c

   1 /*
   2  * This module handles shared rooms, inter-Citadel mail, and outbound
   3  * mailing list processing.
   4  *
   5  * Copyright (c) 2000-2010 by the citadel.org team
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 3 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  22  * This is a fairly high-level type of critical section.  It ensures that no
  23  * two threads work on the netconfigs files at the same time.  Since we do
  24  * so many things inside these, here are the rules:
  25  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  26  *  2. Do *not* perform any I/O with the client during these sections.
  27  *
  28  */
  29
  30 /*
  31  * Duration of time (in seconds) after which pending list subscribe/unsubscribe
  32  * requests that have not been confirmed will be deleted.
  33  */
  34 #define EXP     259200  /* three days */
  35
  36 #include "sysdep.h"
  37 #include <stdlib.h>
  38 #include <unistd.h>
  39 #include <stdio.h>
  40 #include <fcntl.h>
  41 #include <ctype.h>
  42 #include <signal.h>
  43 #include <pwd.h>
  44 #include <errno.h>
  45 #include <sys/stat.h>
  46 #include <sys/types.h>
  47 #include <dirent.h>
  48 #if TIME_WITH_SYS_TIME
  49 # include <sys/time.h>
  50 # include <time.h>
  51 #else
  52 # if HAVE_SYS_TIME_H
  53 #  include <sys/time.h>
  54 # else
  55 #  include <time.h>
  56 # endif
  57 #endif
  58
  59 #include <sys/wait.h>
  60 #include <string.h>
  61 #include <limits.h>
  62 #include <libcitadel.h>
  63 #include "citadel.h"
  64 #include "server.h"
  65 #include "citserver.h"
  66 #include "support.h"
  67 #include "config.h"
  68 #include "user_ops.h"
  69 #include "database.h"
  70 #include "msgbase.h"
  71 #include "internet_addressing.h"
  72 #include "serv_network.h"
  73 #include "clientsocket.h"
  74 #include "file_ops.h"
  75 #include "citadel_dirs.h"
  76 #include "threads.h"
  77
  78 #ifndef HAVE_SNPRINTF
  79 #include "snprintf.h"
  80 #endif
  81
  82 #include "context.h"
  83
  84 #include "ctdl_module.h"
  85
  86
  87
  88 /* Nonzero while we are doing network processing */
  89 static int doing_queue = 0;
  90
  91 /*
  92  * When we do network processing, it's accomplished in two passes; one to
  93  * gather a list of rooms and one to actually do them.  It's ok that rplist
  94  * is global; we have a mutex that keeps it safe.
  95  */
  96 struct RoomProcList *rplist = NULL;
  97
  98 /*
  99  * We build a map of network nodes during processing.
 100  */
 101 NetMap *the_netmap = NULL;
 102 int netmap_changed = 0;
 103 char *working_ignetcfg = NULL;
 104
 105 /*
 106  * Load or refresh the Citadel network (IGnet) configuration for this node.
 107  */
 108 void load_working_ignetcfg(void) {
 109         char *cfg;
 110         char *oldcfg;
 111
 112         cfg = CtdlGetSysConfig(IGNETCFG);
 113         if (cfg == NULL) {
 114                 cfg = strdup("");
 115         }
 116
 117         oldcfg = working_ignetcfg;
 118         working_ignetcfg = cfg;
 119         if (oldcfg != NULL) {
 120                 free(oldcfg);
 121         }
 122 }
 123
 124
 125
 126
 127
 128 /*
 129  * Keep track of what messages to reject
 130  */
 131 FilterList *load_filter_list(void) {
 132         char *serialized_list = NULL;
 133         int i;
 134         char buf[SIZ];
 135         FilterList *newlist = NULL;
 136         FilterList *nptr;
 137
 138         serialized_list = CtdlGetSysConfig(FILTERLIST);
 139         if (serialized_list == NULL) return(NULL); /* if null, no entries */
 140
 141         /* Use the string tokenizer to grab one line at a time */
 142         for (i=0; i<num_tokens(serialized_list, '\n'); ++i) {
 143                 extract_token(buf, serialized_list, i, '\n', sizeof buf);
 144                 nptr = (FilterList *) malloc(sizeof(FilterList));
 145                 extract_token(nptr->fl_user, buf, 0, '|', sizeof nptr->fl_user);
 146                 striplt(nptr->fl_user);
 147                 extract_token(nptr->fl_room, buf, 1, '|', sizeof nptr->fl_room);
 148                 striplt(nptr->fl_room);
 149                 extract_token(nptr->fl_node, buf, 2, '|', sizeof nptr->fl_node);
 150                 striplt(nptr->fl_node);
 151
 152                 /* Cowardly refuse to add an any/any/any entry that would
 153                  * end up filtering every single message.
 154                  */
 155                 if (IsEmptyStr(nptr->fl_user) &&
 156                     IsEmptyStr(nptr->fl_room) &&
 157                     IsEmptyStr(nptr->fl_node)) {
 158                         free(nptr);
 159                 }
 160                 else {
 161                         nptr->next = newlist;
 162                         newlist = nptr;
 163                 }
 164         }
 165
 166         free(serialized_list);
 167         return newlist;
 168 }
 169
 170
 171 void free_filter_list(FilterList *fl) {
 172         if (fl == NULL) return;
 173         free_filter_list(fl->next);
 174         free(fl);
 175 }
 176
 177
 178
 179 /*
 180  * Check the use table.  This is a list of messages which have recently
 181  * arrived on the system.  It is maintained and queried to prevent the same
 182  * message from being entered into the database multiple times if it happens
 183  * to arrive multiple times by accident.
 184  */
 185 int network_usetable(struct CtdlMessage *msg) {
 186
 187         char msgid[SIZ];
 188         struct cdbdata *cdbut;
 189         struct UseTable ut;
 190
 191         /* Bail out if we can't generate a message ID */
 192         if (msg == NULL) {
 193                 return(0);
 194         }
 195         if (msg->cm_fields['I'] == NULL) {
 196                 return(0);
 197         }
 198         if (IsEmptyStr(msg->cm_fields['I'])) {
 199                 return(0);
 200         }
 201
 202         /* Generate the message ID */
 203         strcpy(msgid, msg->cm_fields['I']);
 204         if (haschar(msgid, '@') == 0) {
 205                 strcat(msgid, "@");
 206                 if (msg->cm_fields['N'] != NULL) {
 207                         strcat(msgid, msg->cm_fields['N']);
 208                 }
 209                 else {
 210                         return(0);
 211                 }
 212         }
 213
 214         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 215         if (cdbut != NULL) {
 216                 cdb_free(cdbut);
 217                 CtdlLogPrintf(CTDL_DEBUG, "network_usetable() : we already have %s\n", msgid);
 218                 return(1);
 219         }
 220
 221         /* If we got to this point, it's unique: add it. */
 222         strcpy(ut.ut_msgid, msgid);
 223         ut.ut_timestamp = time(NULL);
 224         cdb_store(CDB_USETABLE, msgid, strlen(msgid), &ut, sizeof(struct UseTable) );
 225         return(0);
 226 }
 227
 228
 229 /*
 230  * Read the network map from its configuration file into memory.
 231  */
 232 void read_network_map(void) {
 233         char *serialized_map = NULL;
 234         int i;
 235         char buf[SIZ];
 236         NetMap *nmptr;
 237
 238         serialized_map = CtdlGetSysConfig(IGNETMAP);
 239         if (serialized_map == NULL) return;     /* if null, no entries */
 240
 241         /* Use the string tokenizer to grab one line at a time */
 242         for (i=0; i<num_tokens(serialized_map, '\n'); ++i) {
 243                 extract_token(buf, serialized_map, i, '\n', sizeof buf);
 244                 nmptr = (NetMap *) malloc(sizeof(NetMap));
 245                 extract_token(nmptr->nodename, buf, 0, '|', sizeof nmptr->nodename);
 246                 nmptr->lastcontact = extract_long(buf, 1);
 247                 extract_token(nmptr->nexthop, buf, 2, '|', sizeof nmptr->nexthop);
 248                 nmptr->next = the_netmap;
 249                 the_netmap = nmptr;
 250         }
 251
 252         free(serialized_map);
 253         netmap_changed = 0;
 254 }
 255
 256
 257 /*
 258  * Write the network map from memory back to the configuration file.
 259  */
 260 void write_network_map(void) {
 261         char *serialized_map = NULL;
 262         NetMap *nmptr;
 263
 264
 265         if (netmap_changed) {
 266                 serialized_map = strdup("");
 267
 268                 if (the_netmap != NULL) {
 269                         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 270                                 serialized_map = realloc(serialized_map,
 271                                                         (strlen(serialized_map)+SIZ) );
 272                                 if (!IsEmptyStr(nmptr->nodename)) {
 273                                         snprintf(&serialized_map[strlen(serialized_map)],
 274                                                 SIZ,
 275                                                 "%s|%ld|%s\n",
 276                                                 nmptr->nodename,
 277                                                 (long)nmptr->lastcontact,
 278                                                 nmptr->nexthop);
 279                                 }
 280                         }
 281                 }
 282
 283                 CtdlPutSysConfig(IGNETMAP, serialized_map);
 284                 free(serialized_map);
 285         }
 286
 287         /* Now free the list */
 288         while (the_netmap != NULL) {
 289                 nmptr = the_netmap->next;
 290                 free(the_netmap);
 291                 the_netmap = nmptr;
 292         }
 293         netmap_changed = 0;
 294 }
 295
 296
 297
 298 /*
 299  * Check the network map and determine whether the supplied node name is
 300  * valid.  If it is not a neighbor node, supply the name of a neighbor node
 301  * which is the next hop.  If it *is* a neighbor node, we also fill in the
 302  * shared secret.
 303  */
 304 int is_valid_node(char *nexthop, char *secret, char *node) {
 305         int i;
 306         char linebuf[SIZ];
 307         char buf[SIZ];
 308         int retval;
 309         NetMap *nmptr;
 310
 311         if (node == NULL) {
 312                 return(-1);
 313         }
 314
 315         /*
 316          * First try the neighbor nodes
 317          */
 318         if (working_ignetcfg == NULL) {
 319                 CtdlLogPrintf(CTDL_ERR, "working_ignetcfg is NULL!\n");
 320                 if (nexthop != NULL) {
 321                         strcpy(nexthop, "");
 322                 }
 323                 return(-1);
 324         }
 325
 326         retval = (-1);
 327         if (nexthop != NULL) {
 328                 strcpy(nexthop, "");
 329         }
 330
 331         /* Use the string tokenizer to grab one line at a time */
 332         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
 333                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
 334                 extract_token(buf, linebuf, 0, '|', sizeof buf);
 335                 if (!strcasecmp(buf, node)) {
 336                         if (nexthop != NULL) {
 337                                 strcpy(nexthop, "");
 338                         }
 339                         if (secret != NULL) {
 340                                 extract_token(secret, linebuf, 1, '|', 256);
 341                         }
 342                         retval = 0;
 343                 }
 344         }
 345
 346         if (retval == 0) {
 347                 return(retval);         /* yup, it's a direct neighbor */
 348         }
 349
 350         /*
 351          * If we get to this point we have to see if we know the next hop
 352          */
 353         if (the_netmap != NULL) {
 354                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 355                         if (!strcasecmp(nmptr->nodename, node)) {
 356                                 if (nexthop != NULL) {
 357                                         strcpy(nexthop, nmptr->nexthop);
 358                                 }
 359                                 return(0);
 360                         }
 361                 }
 362         }
 363
 364         /*
 365          * If we get to this point, the supplied node name is bogus.
 366          */
 367         CtdlLogPrintf(CTDL_ERR, "Invalid node name <%s>\n", node);
 368         return(-1);
 369 }
 370
 371
 372
 373
 374
 375 void cmd_gnet(char *argbuf) {
 376         char filename[PATH_MAX];
 377         char buf[SIZ];
 378         FILE *fp;
 379
 380         if ( (CC->room.QRflags & QR_MAILBOX) && (CC->user.usernum == atol(CC->room.QRname)) ) {
 381                 /* users can edit the netconfigs for their own mailbox rooms */
 382         }
 383         else if (CtdlAccessCheck(ac_room_aide)) return;
 384
 385         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 386         cprintf("%d Network settings for room #%ld <%s>\n",
 387                 LISTING_FOLLOWS,
 388                 CC->room.QRnumber, CC->room.QRname);
 389
 390         fp = fopen(filename, "r");
 391         if (fp != NULL) {
 392                 while (fgets(buf, sizeof buf, fp) != NULL) {
 393                         buf[strlen(buf)-1] = 0;
 394                         cprintf("%s\n", buf);
 395                 }
 396                 fclose(fp);
 397         }
 398
 399         cprintf("000\n");
 400 }
 401
 402
 403 void cmd_snet(char *argbuf) {
 404         char tempfilename[PATH_MAX];
 405         char filename[PATH_MAX];
 406         char buf[SIZ];
 407         FILE *fp, *newfp;
 408
 409         unbuffer_output();
 410
 411         if ( (CC->room.QRflags & QR_MAILBOX) && (CC->user.usernum == atol(CC->room.QRname)) ) {
 412                 /* users can edit the netconfigs for their own mailbox rooms */
 413         }
 414         else if (CtdlAccessCheck(ac_room_aide)) return;
 415
 416         CtdlMakeTempFileName(tempfilename, sizeof tempfilename);
 417         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 418
 419         fp = fopen(tempfilename, "w");
 420         if (fp == NULL) {
 421                 cprintf("%d Cannot open %s: %s\n",
 422                         ERROR + INTERNAL_ERROR,
 423                         tempfilename,
 424                         strerror(errno));
 425         }
 426
 427         cprintf("%d %s\n", SEND_LISTING, tempfilename);
 428         while (client_getln(buf, sizeof buf) >= 0 && strcmp(buf, "000")) {
 429                 fprintf(fp, "%s\n", buf);
 430         }
 431         fclose(fp);
 432
 433         /* Now copy the temp file to its permanent location.
 434          * (We copy instead of link because they may be on different filesystems)
 435          */
 436         begin_critical_section(S_NETCONFIGS);
 437         fp = fopen(tempfilename, "r");
 438         if (fp != NULL) {
 439                 newfp = fopen(filename, "w");
 440                 if (newfp != NULL) {
 441                         while (fgets(buf, sizeof buf, fp) != NULL) {
 442                                 fprintf(newfp, "%s", buf);
 443                         }
 444                         fclose(newfp);
 445                 }
 446                 fclose(fp);
 447         }
 448         end_critical_section(S_NETCONFIGS);
 449         unlink(tempfilename);
 450 }
 451
 452
 453 /*
 454  * Deliver digest messages
 455  */
 456 void network_deliver_digest(SpoolControl *sc) {
 457         char buf[SIZ];
 458         int i;
 459         struct CtdlMessage *msg = NULL;
 460         long msglen;
 461         char *recps = NULL;
 462         size_t recps_len = SIZ;
 463         size_t siz;
 464         struct recptypes *valid;
 465         namelist *nptr;
 466         char bounce_to[256];
 467
 468         if (sc->num_msgs_spooled < 1) {
 469                 fclose(sc->digestfp);
 470                 sc->digestfp = NULL;
 471                 return;
 472         }
 473
 474         msg = malloc(sizeof(struct CtdlMessage));
 475         memset(msg, 0, sizeof(struct CtdlMessage));
 476         msg->cm_magic = CTDLMESSAGE_MAGIC;
 477         msg->cm_format_type = FMT_RFC822;
 478         msg->cm_anon_type = MES_NORMAL;
 479
 480         sprintf(buf, "%ld", time(NULL));
 481         msg->cm_fields['T'] = strdup(buf);
 482         msg->cm_fields['A'] = strdup(CC->room.QRname);
 483         snprintf(buf, sizeof buf, "[%s]", CC->room.QRname);
 484         msg->cm_fields['U'] = strdup(buf);
 485         sprintf(buf, "room_%s@%s", CC->room.QRname, config.c_fqdn);
 486         for (i=0; buf[i]; ++i) {
 487                 if (isspace(buf[i])) buf[i]='_';
 488                 buf[i] = tolower(buf[i]);
 489         }
 490         msg->cm_fields['F'] = strdup(buf);
 491         msg->cm_fields['R'] = strdup(buf);
 492
 493         /* Set the 'List-ID' header */
 494         msg->cm_fields['L'] = malloc(1024);
 495         snprintf(msg->cm_fields['L'], 1024,
 496                 "%s <%ld.list-id.%s>",
 497                 CC->room.QRname,
 498                 CC->room.QRnumber,
 499                 config.c_fqdn
 500         );
 501
 502         /*
 503          * Go fetch the contents of the digest
 504          */
 505         fseek(sc->digestfp, 0L, SEEK_END);
 506         msglen = ftell(sc->digestfp);
 507
 508         msg->cm_fields['M'] = malloc(msglen + 1);
 509         fseek(sc->digestfp, 0L, SEEK_SET);
 510         siz = fread(msg->cm_fields['M'], (size_t)msglen, 1, sc->digestfp);
 511         msg->cm_fields['M'][msglen] = '\0';
 512
 513         fclose(sc->digestfp);
 514         sc->digestfp = NULL;
 515
 516         /* Now generate the delivery instructions */
 517
 518         /*
 519          * Figure out how big a buffer we need to allocate
 520          */
 521         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 522                 recps_len = recps_len + strlen(nptr->name) + 2;
 523         }
 524
 525         recps = malloc(recps_len);
 526
 527         if (recps == NULL) {
 528                 CtdlLogPrintf(CTDL_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 529                 abort();
 530         }
 531
 532         strcpy(recps, "");
 533
 534         /* Each recipient */
 535         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 536                 if (nptr != sc->digestrecps) {
 537                         strcat(recps, ",");
 538                 }
 539                 strcat(recps, nptr->name);
 540         }
 541
 542         /* Where do we want bounces and other noise to be heard?  Surely not the list members! */
 543         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 544
 545         /* Now submit the message */
 546         valid = validate_recipients(recps, NULL, 0);
 547         free(recps);
 548         if (valid != NULL) {
 549                 valid->bounce_to = strdup(bounce_to);
 550                 valid->envelope_from = strdup(bounce_to);
 551                 CtdlSubmitMsg(msg, valid, NULL, 0);
 552         }
 553         CtdlFreeMessage(msg);
 554         free_recipients(valid);
 555 }
 556
 557
 558 /*
 559  * Deliver list messages to everyone on the list ... efficiently
 560  */
 561 void network_deliver_list(struct CtdlMessage *msg, SpoolControl *sc) {
 562         char *recps = NULL;
 563         size_t recps_len = SIZ;
 564         struct recptypes *valid;
 565         namelist *nptr;
 566         char bounce_to[256];
 567
 568         /* Don't do this if there were no recipients! */
 569         if (sc->listrecps == NULL) return;
 570
 571         /* Now generate the delivery instructions */
 572
 573         /*
 574          * Figure out how big a buffer we need to allocate
 575          */
 576         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 577                 recps_len = recps_len + strlen(nptr->name) + 2;
 578         }
 579
 580         recps = malloc(recps_len);
 581
 582         if (recps == NULL) {
 583                 CtdlLogPrintf(CTDL_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 584                 abort();
 585         }
 586
 587         strcpy(recps, "");
 588
 589         /* Each recipient */
 590         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 591                 if (nptr != sc->listrecps) {
 592                         strcat(recps, ",");
 593                 }
 594                 strcat(recps, nptr->name);
 595         }
 596
 597         /* Where do we want bounces and other noise to be heard?  Surely not the list members! */
 598         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 599
 600         /* Now submit the message */
 601         valid = validate_recipients(recps, NULL, 0);
 602         free(recps);
 603         if (valid != NULL) {
 604                 valid->bounce_to = strdup(bounce_to);
 605                 valid->envelope_from = strdup(bounce_to);
 606                 CtdlSubmitMsg(msg, valid, NULL, 0);
 607                 free_recipients(valid);
 608         }
 609         /* Do not call CtdlFreeMessage(msg) here; the caller will free it. */
 610 }
 611
 612
 613
 614
 615 /*
 616  * Spools out one message from the list.
 617  */
 618 void network_spool_msg(long msgnum, void *userdata) {
 619         SpoolControl *sc;
 620         int i;
 621         char *newpath = NULL;
 622         size_t instr_len = SIZ;
 623         struct CtdlMessage *msg = NULL;
 624         namelist *nptr;
 625         maplist *mptr;
 626         struct ser_ret sermsg;
 627         FILE *fp;
 628         char filename[PATH_MAX];
 629         char buf[SIZ];
 630         int bang = 0;
 631         int send = 1;
 632         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 633         int ok_to_participate = 0;
 634         struct recptypes *valid;
 635
 636         sc = (SpoolControl *)userdata;
 637
 638         /*
 639          * Process mailing list recipients
 640          */
 641         instr_len = SIZ;
 642         if (sc->listrecps != NULL) {
 643                 /* Fetch the message.  We're going to need to modify it
 644                  * in order to insert the [list name] in it, etc.
 645                  */
 646                 msg = CtdlFetchMessage(msgnum, 1);
 647                 if (msg != NULL) {
 648                         if (msg->cm_fields['V'] == NULL){
 649                                 /* local message, no enVelope */
 650                                 StrBuf *Buf;
 651                                 Buf = NewStrBuf();
 652                                 StrBufAppendBufPlain(Buf, msg->cm_fields['O'], -1, 0);
 653                                 StrBufAppendBufPlain(Buf, HKEY("@"), 0);
 654                                 StrBufAppendBufPlain(Buf, config.c_fqdn, -1, 0);
 655
 656                                 msg->cm_fields['K'] = SmashStrBuf(&Buf);
 657                         }
 658                         else {
 659                                 msg->cm_fields['K'] = strdup (msg->cm_fields['V']);
 660                         }
 661                         /* Set the 'List-ID' header */
 662                         if (msg->cm_fields['L'] != NULL) {
 663                                 free(msg->cm_fields['L']);
 664                         }
 665                         msg->cm_fields['L'] = malloc(1024);
 666                         snprintf(msg->cm_fields['L'], 1024,
 667                                 "%s <%ld.list-id.%s>",
 668                                 CC->room.QRname,
 669                                 CC->room.QRnumber,
 670                                 config.c_fqdn
 671                         );
 672
 673                         /* Prepend "[List name]" to the subject */
 674                         if (msg->cm_fields['U'] == NULL) {
 675                                 msg->cm_fields['U'] = strdup("(no subject)");
 676                         }
 677                         snprintf(buf, sizeof buf, "[%s] %s", CC->room.QRname, msg->cm_fields['U']);
 678                         free(msg->cm_fields['U']);
 679                         msg->cm_fields['U'] = strdup(buf);
 680
 681                         /* Set the recipient of the list message to the
 682                          * email address of the room itself.
 683                          * FIXME ... I want to be able to pick any address
 684                          */
 685                         if (msg->cm_fields['R'] != NULL) {
 686                                 free(msg->cm_fields['R']);
 687                         }
 688                         msg->cm_fields['R'] = malloc(256);
 689                         snprintf(msg->cm_fields['R'], 256,
 690                                 "room_%s@%s", CC->room.QRname,
 691                                 config.c_fqdn);
 692                         for (i=0; msg->cm_fields['R'][i]; ++i) {
 693                                 if (isspace(msg->cm_fields['R'][i])) {
 694                                         msg->cm_fields['R'][i] = '_';
 695                                 }
 696                         }
 697
 698                         /* Handle delivery */
 699                         network_deliver_list(msg, sc);
 700                         CtdlFreeMessage(msg);
 701                 }
 702         }
 703
 704         /*
 705          * Process digest recipients
 706          */
 707         if ((sc->digestrecps != NULL) && (sc->digestfp != NULL)) {
 708                 msg = CtdlFetchMessage(msgnum, 1);
 709                 if (msg != NULL) {
 710                         fprintf(sc->digestfp,   " -----------------------------------"
 711                                                 "------------------------------------"
 712                                                 "-------\n");
 713                         fprintf(sc->digestfp, "From: ");
 714                         if (msg->cm_fields['A'] != NULL) {
 715                                 fprintf(sc->digestfp, "%s ", msg->cm_fields['A']);
 716                         }
 717                         if (msg->cm_fields['F'] != NULL) {
 718                                 fprintf(sc->digestfp, "<%s> ", msg->cm_fields['F']);
 719                         }
 720                         else if (msg->cm_fields['N'] != NULL) {
 721                                 fprintf(sc->digestfp, "@%s ", msg->cm_fields['N']);
 722                         }
 723                         fprintf(sc->digestfp, "\n");
 724                         if (msg->cm_fields['U'] != NULL) {
 725                                 fprintf(sc->digestfp, "Subject: %s\n", msg->cm_fields['U']);
 726                         }
 727
 728                         CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 729
 730                         safestrncpy(CC->preferred_formats, "text/plain", sizeof CC->preferred_formats);
 731                         CtdlOutputPreLoadedMsg(msg, MT_CITADEL, HEADERS_NONE, 0, 0, 0);
 732
 733                         StrBufTrim(CC->redirect_buffer);
 734                         fwrite(HKEY("\n"), 1, sc->digestfp);
 735                         fwrite(SKEY(CC->redirect_buffer), 1, sc->digestfp);
 736                         fwrite(HKEY("\n"), 1, sc->digestfp);
 737
 738                         FreeStrBuf(&CC->redirect_buffer);
 739
 740                         sc->num_msgs_spooled += 1;
 741                         free(msg);
 742                 }
 743         }
 744
 745         /*
 746          * Process client-side list participations for this room
 747          */
 748         instr_len = SIZ;
 749         if (sc->participates != NULL) {
 750                 msg = CtdlFetchMessage(msgnum, 1);
 751                 if (msg != NULL) {
 752
 753                         /* Only send messages which originated on our own Citadel
 754                          * network, otherwise we'll end up sending the remote
 755                          * mailing list's messages back to it, which is rude...
 756                          */
 757                         ok_to_participate = 0;
 758                         if (msg->cm_fields['N'] != NULL) {
 759                                 if (!strcasecmp(msg->cm_fields['N'], config.c_nodename)) {
 760                                         ok_to_participate = 1;
 761                                 }
 762                                 if (is_valid_node(NULL, NULL, msg->cm_fields['N']) == 0) {
 763                                         ok_to_participate = 1;
 764                                 }
 765                         }
 766                         if (ok_to_participate) {
 767                                 if (msg->cm_fields['F'] != NULL) {
 768                                         free(msg->cm_fields['F']);
 769                                 }
 770                                 msg->cm_fields['F'] = malloc(SIZ);
 771                                 /* Replace the Internet email address of the actual
 772                                 * author with the email address of the room itself,
 773                                 * so the remote listserv doesn't reject us.
 774                                 * FIXME ... I want to be able to pick any address
 775                                 */
 776                                 snprintf(msg->cm_fields['F'], SIZ,
 777                                         "room_%s@%s", CC->room.QRname,
 778                                         config.c_fqdn);
 779                                 for (i=0; msg->cm_fields['F'][i]; ++i) {
 780                                         if (isspace(msg->cm_fields['F'][i])) {
 781                                                 msg->cm_fields['F'][i] = '_';
 782                                         }
 783                                 }
 784
 785                                 /*
 786                                  * Figure out how big a buffer we need to allocate
 787                                  */
 788                                 for (nptr = sc->participates; nptr != NULL; nptr = nptr->next) {
 789
 790                                         if (msg->cm_fields['R'] == NULL) {
 791                                                 free(msg->cm_fields['R']);
 792                                         }
 793                                         msg->cm_fields['R'] = strdup(nptr->name);
 794
 795                                         valid = validate_recipients(nptr->name, NULL, 0);
 796                                         CtdlSubmitMsg(msg, valid, "", 0);
 797                                         free_recipients(valid);
 798                                 }
 799
 800                         }
 801                         CtdlFreeMessage(msg);
 802                 }
 803         }
 804
 805         /*
 806          * Process IGnet push shares
 807          */
 808         msg = CtdlFetchMessage(msgnum, 1);
 809         if (msg != NULL) {
 810                 size_t newpath_len;
 811
 812                 /* Prepend our node name to the Path field whenever
 813                  * sending a message to another IGnet node
 814                  */
 815                 if (msg->cm_fields['P'] == NULL) {
 816                         msg->cm_fields['P'] = strdup("username");
 817                 }
 818                 newpath_len = strlen(msg->cm_fields['P']) +
 819                          strlen(config.c_nodename) + 2;
 820                 newpath = malloc(newpath_len);
 821                 snprintf(newpath, newpath_len, "%s!%s",
 822                          config.c_nodename, msg->cm_fields['P']);
 823                 free(msg->cm_fields['P']);
 824                 msg->cm_fields['P'] = newpath;
 825
 826                 /*
 827                  * Determine if this message is set to be deleted
 828                  * after sending out on the network
 829                  */
 830                 if (msg->cm_fields['S'] != NULL) {
 831                         if (!strcasecmp(msg->cm_fields['S'], "CANCEL")) {
 832                                 delete_after_send = 1;
 833                         }
 834                 }
 835
 836                 /* Now send it to every node */
 837                 if (sc->ignet_push_shares != NULL)
 838                   for (mptr = sc->ignet_push_shares; mptr != NULL;
 839                     mptr = mptr->next) {
 840
 841                         send = 1;
 842
 843                         /* Check for valid node name */
 844                         if (is_valid_node(NULL, NULL, mptr->remote_nodename) != 0) {
 845                                 CtdlLogPrintf(CTDL_ERR, "Invalid node <%s>\n", mptr->remote_nodename);
 846                                 send = 0;
 847                         }
 848
 849                         /* Check for split horizon */
 850                         CtdlLogPrintf(CTDL_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 851                         bang = num_tokens(msg->cm_fields['P'], '!');
 852                         if (bang > 1) for (i=0; i<(bang-1); ++i) {
 853                                 extract_token(buf, msg->cm_fields['P'], i, '!', sizeof buf);
 854                                 CtdlLogPrintf(CTDL_DEBUG, "Compare <%s> to <%s>\n",
 855                                         buf, mptr->remote_nodename) ;
 856                                 if (!strcasecmp(buf, mptr->remote_nodename)) {
 857                                         send = 0;
 858                                         CtdlLogPrintf(CTDL_DEBUG, "Not sending to %s\n",
 859                                                 mptr->remote_nodename);
 860                                 }
 861                                 else {
 862                                         CtdlLogPrintf(CTDL_DEBUG, "Sending to %s\n", mptr->remote_nodename);
 863                                 }
 864                         }
 865
 866                         /* Send the message */
 867                         if (send == 1) {
 868
 869                                 /*
 870                                  * Force the message to appear in the correct room
 871                                  * on the far end by setting the C field correctly
 872                                  */
 873                                 if (msg->cm_fields['C'] != NULL) {
 874                                         free(msg->cm_fields['C']);
 875                                 }
 876                                 if (!IsEmptyStr(mptr->remote_roomname)) {
 877                                         msg->cm_fields['C'] = strdup(mptr->remote_roomname);
 878                                 }
 879                                 else {
 880                                         msg->cm_fields['C'] = strdup(CC->room.QRname);
 881                                 }
 882
 883                                 /* serialize it for transmission */
 884                                 serialize_message(&sermsg, msg);
 885                                 if (sermsg.len > 0) {
 886
 887                                         /* write it to a spool file */
 888                                         snprintf(filename, sizeof filename,"%s/%s@%lx%x",
 889                                                 ctdl_netout_dir,
 890                                                 mptr->remote_nodename,
 891                                                 time(NULL),
 892                                                 rand()
 893                                         );
 894                                         CtdlLogPrintf(CTDL_DEBUG, "Appending to %s\n", filename);
 895                                         fp = fopen(filename, "ab");
 896                                         if (fp != NULL) {
 897                                                 fwrite(sermsg.ser,
 898                                                         sermsg.len, 1, fp);
 899                                                 fclose(fp);
 900                                         }
 901                                         else {
 902                                                 CtdlLogPrintf(CTDL_ERR, "%s: %s\n", filename, strerror(errno));
 903                                         }
 904
 905                                         /* free the serialized version */
 906                                         free(sermsg.ser);
 907                                 }
 908
 909                         }
 910                 }
 911                 CtdlFreeMessage(msg);
 912         }
 913
 914         /* update lastsent */
 915         sc->lastsent = msgnum;
 916
 917         /* Delete this message if delete-after-send is set */
 918         if (delete_after_send) {
 919                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 920         }
 921
 922 }
 923
 924
 925 int read_spoolcontrol_file(SpoolControl **scc, char *filename)
 926 {
 927         FILE *fp;
 928         char instr[SIZ];
 929         char buf[SIZ];
 930         char nodename[256];
 931         char roomname[ROOMNAMELEN];
 932         size_t miscsize = 0;
 933         size_t linesize = 0;
 934         int skipthisline = 0;
 935         namelist *nptr = NULL;
 936         maplist *mptr = NULL;
 937         SpoolControl *sc;
 938
 939         fp = fopen(filename, "r");
 940         if (fp == NULL) {
 941                 return 0;
 942         }
 943         sc = malloc(sizeof(SpoolControl));
 944         memset(sc, 0, sizeof(SpoolControl));
 945         *scc = sc;
 946
 947         while (fgets(buf, sizeof buf, fp) != NULL) {
 948                 buf[strlen(buf)-1] = 0;
 949
 950                 extract_token(instr, buf, 0, '|', sizeof instr);
 951                 if (!strcasecmp(instr, strof(lastsent))) {
 952                         sc->lastsent = extract_long(buf, 1);
 953                 }
 954                 else if (!strcasecmp(instr, strof(listrecp))) {
 955                         nptr = (namelist *)
 956                                 malloc(sizeof(namelist));
 957                         nptr->next = sc->listrecps;
 958                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 959                         sc->listrecps = nptr;
 960                 }
 961                 else if (!strcasecmp(instr, strof(participate))) {
 962                         nptr = (namelist *)
 963                                 malloc(sizeof(namelist));
 964                         nptr->next = sc->participates;
 965                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 966                         sc->participates = nptr;
 967                 }
 968                 else if (!strcasecmp(instr, strof(digestrecp))) {
 969                         nptr = (namelist *)
 970                                 malloc(sizeof(namelist));
 971                         nptr->next = sc->digestrecps;
 972                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 973                         sc->digestrecps = nptr;
 974                 }
 975                 else if (!strcasecmp(instr, strof(ignet_push_share))) {
 976                         extract_token(nodename, buf, 1, '|', sizeof nodename);
 977                         extract_token(roomname, buf, 2, '|', sizeof roomname);
 978                         mptr = (maplist *) malloc(sizeof(maplist));
 979                         mptr->next = sc->ignet_push_shares;
 980                         strcpy(mptr->remote_nodename, nodename);
 981                         strcpy(mptr->remote_roomname, roomname);
 982                         sc->ignet_push_shares = mptr;
 983                 }
 984                 else {
 985                         /* Preserve 'other' lines ... *unless* they happen to
 986                          * be subscribe/unsubscribe pendings with expired
 987                          * timestamps.
 988                          */
 989                         skipthisline = 0;
 990                         if (!strncasecmp(buf, strof(subpending)"|", 11)) {
 991                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
 992                                         skipthisline = 1;
 993                                 }
 994                         }
 995                         if (!strncasecmp(buf, strof(unsubpending)"|", 13)) {
 996                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
 997                                         skipthisline = 1;
 998                                 }
 999                         }
1000
1001                         if (skipthisline == 0) {
1002                                 linesize = strlen(buf);
1003                                 sc->misc = realloc(sc->misc,
1004                                         (miscsize + linesize + 2) );
1005                                 sprintf(&sc->misc[miscsize], "%s\n", buf);
1006                                 miscsize = miscsize + linesize + 1;
1007                         }
1008                 }
1009
1010
1011         }
1012         fclose(fp);
1013         return 1;
1014 }
1015
1016 void free_spoolcontrol_struct(SpoolControl **scc)
1017 {
1018         SpoolControl *sc;
1019         namelist *nptr = NULL;
1020         maplist *mptr = NULL;
1021
1022         sc = *scc;
1023         while (sc->listrecps != NULL) {
1024                 nptr = sc->listrecps->next;
1025                 free(sc->listrecps);
1026                 sc->listrecps = nptr;
1027         }
1028         /* Do the same for digestrecps */
1029         while (sc->digestrecps != NULL) {
1030                 nptr = sc->digestrecps->next;
1031                 free(sc->digestrecps);
1032                 sc->digestrecps = nptr;
1033         }
1034         /* Do the same for participates */
1035         while (sc->participates != NULL) {
1036                 nptr = sc->participates->next;
1037                 free(sc->participates);
1038                 sc->participates = nptr;
1039         }
1040         while (sc->ignet_push_shares != NULL) {
1041                 mptr = sc->ignet_push_shares->next;
1042                 free(sc->ignet_push_shares);
1043                 sc->ignet_push_shares = mptr;
1044         }
1045         free(sc->misc);
1046         free(sc);
1047         *scc=NULL;
1048 }
1049
1050 int writenfree_spoolcontrol_file(SpoolControl **scc, char *filename)
1051 {
1052         FILE *fp;
1053         SpoolControl *sc;
1054         namelist *nptr = NULL;
1055         maplist *mptr = NULL;
1056
1057         sc = *scc;
1058         fp = fopen(filename, "w");
1059         if (fp == NULL) {
1060                 CtdlLogPrintf(CTDL_CRIT, "ERROR: cannot open %s: %s\n",
1061                         filename, strerror(errno));
1062                 free_spoolcontrol_struct(scc);
1063         }
1064         else {
1065                 fprintf(fp, "lastsent|%ld\n", sc->lastsent);
1066
1067                 /* Write out the listrecps while freeing from memory at the
1068                  * same time.  Am I clever or what?  :)
1069                  */
1070                 while (sc->listrecps != NULL) {
1071                         fprintf(fp, "listrecp|%s\n", sc->listrecps->name);
1072                         nptr = sc->listrecps->next;
1073                         free(sc->listrecps);
1074                         sc->listrecps = nptr;
1075                 }
1076                 /* Do the same for digestrecps */
1077                 while (sc->digestrecps != NULL) {
1078                         fprintf(fp, "digestrecp|%s\n", sc->digestrecps->name);
1079                         nptr = sc->digestrecps->next;
1080                         free(sc->digestrecps);
1081                         sc->digestrecps = nptr;
1082                 }
1083                 /* Do the same for participates */
1084                 while (sc->participates != NULL) {
1085                         fprintf(fp, "participate|%s\n", sc->participates->name);
1086                         nptr = sc->participates->next;
1087                         free(sc->participates);
1088                         sc->participates = nptr;
1089                 }
1090                 while (sc->ignet_push_shares != NULL) {
1091                         fprintf(fp, "ignet_push_share|%s", sc->ignet_push_shares->remote_nodename);
1092                         if (!IsEmptyStr(sc->ignet_push_shares->remote_roomname)) {
1093                                 fprintf(fp, "|%s", sc->ignet_push_shares->remote_roomname);
1094                         }
1095                         fprintf(fp, "\n");
1096                         mptr = sc->ignet_push_shares->next;
1097                         free(sc->ignet_push_shares);
1098                         sc->ignet_push_shares = mptr;
1099                 }
1100                 if (sc->misc != NULL) {
1101                         fwrite(sc->misc, strlen(sc->misc), 1, fp);
1102                 }
1103                 free(sc->misc);
1104
1105                 fclose(fp);
1106                 free(sc);
1107                 *scc=NULL;
1108         }
1109         return 1;
1110 }
1111 int is_recipient(SpoolControl *sc, const char *Name)
1112 {
1113         namelist *nptr;
1114         size_t len;
1115
1116         len = strlen(Name);
1117         nptr = sc->listrecps;
1118         while (nptr != NULL) {
1119                 if (strncmp(Name, nptr->name, len)==0)
1120                         return 1;
1121                 nptr = nptr->next;
1122         }
1123         /* Do the same for digestrecps */
1124         nptr = sc->digestrecps;
1125         while (nptr != NULL) {
1126                 if (strncmp(Name, nptr->name, len)==0)
1127                         return 1;
1128                 nptr = nptr->next;
1129         }
1130         /* Do the same for participates */
1131         nptr = sc->participates;
1132         while (nptr != NULL) {
1133                 if (strncmp(Name, nptr->name, len)==0)
1134                         return 1;
1135                 nptr = nptr->next;
1136         }
1137         return 0;
1138 }
1139
1140
1141 /*
1142  * Batch up and send all outbound traffic from the current room
1143  */
1144 void network_spoolout_room(char *room_to_spool) {
1145         char buf[SIZ];
1146         char filename[PATH_MAX];
1147         SpoolControl *sc;
1148         int i;
1149
1150         /*
1151          * If the room doesn't exist, don't try to perform its networking tasks.
1152          * Normally this should never happen, but once in a while maybe a room gets
1153          * queued for networking and then deleted before it can happen.
1154          */
1155         if (CtdlGetRoom(&CC->room, room_to_spool) != 0) {
1156                 CtdlLogPrintf(CTDL_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
1157                 return;
1158         }
1159
1160         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1161         begin_critical_section(S_NETCONFIGS);
1162
1163         /* Only do net processing for rooms that have netconfigs */
1164         if (!read_spoolcontrol_file(&sc, filename))
1165         {
1166                 end_critical_section(S_NETCONFIGS);
1167                 return;
1168         }
1169         CtdlLogPrintf(CTDL_INFO, "Networking started for <%s>\n", CC->room.QRname);
1170
1171         /* If there are digest recipients, we have to build a digest */
1172         if (sc->digestrecps != NULL) {
1173                 sc->digestfp = tmpfile();
1174                 fprintf(sc->digestfp, "Content-type: text/plain\n\n");
1175         }
1176
1177         /* Do something useful */
1178         CtdlForEachMessage(MSGS_GT, sc->lastsent, NULL, NULL, NULL,
1179                 network_spool_msg, sc);
1180
1181         /* If we wrote a digest, deliver it and then close it */
1182         snprintf(buf, sizeof buf, "room_%s@%s",
1183                 CC->room.QRname, config.c_fqdn);
1184         for (i=0; buf[i]; ++i) {
1185                 buf[i] = tolower(buf[i]);
1186                 if (isspace(buf[i])) buf[i] = '_';
1187         }
1188         if (sc->digestfp != NULL) {
1189                 fprintf(sc->digestfp,   " -----------------------------------"
1190                                         "------------------------------------"
1191                                         "-------\n"
1192                                         "You are subscribed to the '%s' "
1193                                         "list.\n"
1194                                         "To post to the list: %s\n",
1195                                         CC->room.QRname, buf
1196                 );
1197                 network_deliver_digest(sc);     /* deliver and close */
1198         }
1199
1200         /* Now rewrite the config file */
1201         writenfree_spoolcontrol_file (&sc, filename);
1202         end_critical_section(S_NETCONFIGS);
1203 }
1204
1205
1206
1207 /*
1208  * Send the *entire* contents of the current room to one specific network node,
1209  * ignoring anything we know about which messages have already undergone
1210  * network processing.  This can be used to bring a new node into sync.
1211  */
1212 int network_sync_to(char *target_node) {
1213         SpoolControl sc;
1214         int num_spooled = 0;
1215         int found_node = 0;
1216         char buf[256];
1217         char sc_type[256];
1218         char sc_node[256];
1219         char sc_room[256];
1220         char filename[PATH_MAX];
1221         FILE *fp;
1222
1223         /* Grab the configuration line we're looking for */
1224         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1225         begin_critical_section(S_NETCONFIGS);
1226         fp = fopen(filename, "r");
1227         if (fp == NULL) {
1228                 end_critical_section(S_NETCONFIGS);
1229                 return(-1);
1230         }
1231         while (fgets(buf, sizeof buf, fp) != NULL) {
1232                 buf[strlen(buf)-1] = 0;
1233                 extract_token(sc_type, buf, 0, '|', sizeof sc_type);
1234                 extract_token(sc_node, buf, 1, '|', sizeof sc_node);
1235                 extract_token(sc_room, buf, 2, '|', sizeof sc_room);
1236                 if ( (!strcasecmp(sc_type, "ignet_push_share"))
1237                    && (!strcasecmp(sc_node, target_node)) ) {
1238                         found_node = 1;
1239
1240                         /* Concise syntax because we don't need a full linked-list */
1241                         memset(&sc, 0, sizeof(SpoolControl));
1242                         sc.ignet_push_shares = (maplist *)
1243                                 malloc(sizeof(maplist));
1244                         sc.ignet_push_shares->next = NULL;
1245                         safestrncpy(sc.ignet_push_shares->remote_nodename,
1246                                 sc_node,
1247                                 sizeof sc.ignet_push_shares->remote_nodename);
1248                         safestrncpy(sc.ignet_push_shares->remote_roomname,
1249                                 sc_room,
1250                                 sizeof sc.ignet_push_shares->remote_roomname);
1251                 }
1252         }
1253         fclose(fp);
1254         end_critical_section(S_NETCONFIGS);
1255
1256         if (!found_node) return(-1);
1257
1258         /* Send ALL messages */
1259         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL,
1260                 network_spool_msg, &sc);
1261
1262         /* Concise cleanup because we know there's only one node in the sc */
1263         free(sc.ignet_push_shares);
1264
1265         CtdlLogPrintf(CTDL_NOTICE, "Synchronized %d messages to <%s>\n",
1266                 num_spooled, target_node);
1267         return(num_spooled);
1268 }
1269
1270
1271 /*
1272  * Implements the NSYN command
1273  */
1274 void cmd_nsyn(char *argbuf) {
1275         int num_spooled;
1276         char target_node[256];
1277
1278         if (CtdlAccessCheck(ac_aide)) return;
1279
1280         extract_token(target_node, argbuf, 0, '|', sizeof target_node);
1281         num_spooled = network_sync_to(target_node);
1282         if (num_spooled >= 0) {
1283                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
1284         }
1285         else {
1286                 cprintf("%d No such room/node share exists.\n",
1287                         ERROR + ROOM_NOT_FOUND);
1288         }
1289 }
1290
1291
1292
1293 /*
1294  * Batch up and send all outbound traffic from the current room
1295  */
1296 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
1297         struct RoomProcList *ptr;
1298
1299         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
1300         if (ptr == NULL) return;
1301
1302         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
1303         begin_critical_section(S_RPLIST);
1304         ptr->next = rplist;
1305         rplist = ptr;
1306         end_critical_section(S_RPLIST);
1307 }
1308
1309 void destroy_network_queue_room(void)
1310 {
1311         struct RoomProcList *cur, *p;
1312         NetMap *nmcur, *nmp;
1313
1314         cur = rplist;
1315         begin_critical_section(S_RPLIST);
1316         while (cur != NULL)
1317         {
1318                 p = cur->next;
1319                 free (cur);
1320                 cur = p;
1321         }
1322         rplist = NULL;
1323         end_critical_section(S_RPLIST);
1324
1325         nmcur = the_netmap;
1326         while (nmcur != NULL)
1327         {
1328                 nmp = nmcur->next;
1329                 free (nmcur);
1330                 nmcur = nmp;
1331         }
1332         the_netmap = NULL;
1333         if (working_ignetcfg != NULL)
1334                 free (working_ignetcfg);
1335         working_ignetcfg = NULL;
1336 }
1337
1338
1339 /*
1340  * Learn topology from path fields
1341  */
1342 void network_learn_topology(char *node, char *path) {
1343         char nexthop[256];
1344         NetMap *nmptr;
1345
1346         strcpy(nexthop, "");
1347
1348         if (num_tokens(path, '!') < 3) return;
1349         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
1350                 if (!strcasecmp(nmptr->nodename, node)) {
1351                         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1352                         nmptr->lastcontact = time(NULL);
1353                         ++netmap_changed;
1354                         return;
1355                 }
1356         }
1357
1358         /* If we got here then it's not in the map, so add it. */
1359         nmptr = (NetMap *) malloc(sizeof (NetMap));
1360         strcpy(nmptr->nodename, node);
1361         nmptr->lastcontact = time(NULL);
1362         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1363         nmptr->next = the_netmap;
1364         the_netmap = nmptr;
1365         ++netmap_changed;
1366 }
1367
1368
1369
1370
1371 /*
1372  * Bounce a message back to the sender
1373  */
1374 void network_bounce(struct CtdlMessage *msg, char *reason) {
1375         char *oldpath = NULL;
1376         char buf[SIZ];
1377         char bouncesource[SIZ];
1378         char recipient[SIZ];
1379         struct recptypes *valid = NULL;
1380         char force_room[ROOMNAMELEN];
1381         static int serialnum = 0;
1382         size_t size;
1383
1384         CtdlLogPrintf(CTDL_DEBUG, "entering network_bounce()\n");
1385
1386         if (msg == NULL) return;
1387
1388         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
1389
1390         /*
1391          * Give it a fresh message ID
1392          */
1393         if (msg->cm_fields['I'] != NULL) {
1394                 free(msg->cm_fields['I']);
1395         }
1396         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
1397                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
1398         msg->cm_fields['I'] = strdup(buf);
1399
1400         /*
1401          * FIXME ... right now we're just sending a bounce; we really want to
1402          * include the text of the bounced message.
1403          */
1404         if (msg->cm_fields['M'] != NULL) {
1405                 free(msg->cm_fields['M']);
1406         }
1407         msg->cm_fields['M'] = strdup(reason);
1408         msg->cm_format_type = 0;
1409
1410         /*
1411          * Turn the message around
1412          */
1413         if (msg->cm_fields['R'] == NULL) {
1414                 free(msg->cm_fields['R']);
1415         }
1416
1417         if (msg->cm_fields['D'] == NULL) {
1418                 free(msg->cm_fields['D']);
1419         }
1420
1421         snprintf(recipient, sizeof recipient, "%s@%s",
1422                 msg->cm_fields['A'], msg->cm_fields['N']);
1423
1424         if (msg->cm_fields['A'] == NULL) {
1425                 free(msg->cm_fields['A']);
1426         }
1427
1428         if (msg->cm_fields['N'] == NULL) {
1429                 free(msg->cm_fields['N']);
1430         }
1431
1432         if (msg->cm_fields['U'] == NULL) {
1433                 free(msg->cm_fields['U']);
1434         }
1435
1436         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1437         msg->cm_fields['N'] = strdup(config.c_nodename);
1438         msg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
1439
1440         /* prepend our node to the path */
1441         if (msg->cm_fields['P'] != NULL) {
1442                 oldpath = msg->cm_fields['P'];
1443                 msg->cm_fields['P'] = NULL;
1444         }
1445         else {
1446                 oldpath = strdup("unknown_user");
1447         }
1448         size = strlen(oldpath) + SIZ;
1449         msg->cm_fields['P'] = malloc(size);
1450         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1451         free(oldpath);
1452
1453         /* Now submit the message */
1454         valid = validate_recipients(recipient, NULL, 0);
1455         if (valid != NULL) if (valid->num_error != 0) {
1456                 free_recipients(valid);
1457                 valid = NULL;
1458         }
1459         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1460                 strcpy(force_room, config.c_aideroom);
1461         }
1462         else {
1463                 strcpy(force_room, "");
1464         }
1465         if ( (valid == NULL) && IsEmptyStr(force_room) ) {
1466                 strcpy(force_room, config.c_aideroom);
1467         }
1468         CtdlSubmitMsg(msg, valid, force_room, 0);
1469
1470         /* Clean up */
1471         if (valid != NULL) free_recipients(valid);
1472         CtdlFreeMessage(msg);
1473         CtdlLogPrintf(CTDL_DEBUG, "leaving network_bounce()\n");
1474 }
1475
1476
1477
1478
1479 /*
1480  * Process a buffer containing a single message from a single file
1481  * from the inbound queue
1482  */
1483 void network_process_buffer(char *buffer, long size) {
1484         struct CtdlMessage *msg = NULL;
1485         long pos;
1486         int field;
1487         struct recptypes *recp = NULL;
1488         char target_room[ROOMNAMELEN];
1489         struct ser_ret sermsg;
1490         char *oldpath = NULL;
1491         char filename[PATH_MAX];
1492         FILE *fp;
1493         char nexthop[SIZ];
1494         unsigned char firstbyte;
1495         unsigned char lastbyte;
1496
1497         CtdlLogPrintf(CTDL_DEBUG, "network_process_buffer() processing %ld bytes\n", size);
1498
1499         /* Validate just a little bit.  First byte should be FF and * last byte should be 00. */
1500         firstbyte = buffer[0];
1501         lastbyte = buffer[size-1];
1502         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1503                 CtdlLogPrintf(CTDL_ERR, "Corrupt message ignored.  Length=%ld, firstbyte = %d, lastbyte = %d\n",
1504                         size, firstbyte, lastbyte);
1505                 return;
1506         }
1507
1508         /* Set default target room to trash */
1509         strcpy(target_room, TWITROOM);
1510
1511         /* Load the message into memory */
1512         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1513         memset(msg, 0, sizeof(struct CtdlMessage));
1514         msg->cm_magic = CTDLMESSAGE_MAGIC;
1515         msg->cm_anon_type = buffer[1];
1516         msg->cm_format_type = buffer[2];
1517
1518         for (pos = 3; pos < size; ++pos) {
1519                 field = buffer[pos];
1520                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1521                 pos = pos + strlen(&buffer[(int)pos]);
1522         }
1523
1524         /* Check for message routing */
1525         if (msg->cm_fields['D'] != NULL) {
1526                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1527
1528                         /* route the message */
1529                         strcpy(nexthop, "");
1530                         if (is_valid_node(nexthop, NULL, msg->cm_fields['D']) == 0) {
1531                                 /* prepend our node to the path */
1532                                 if (msg->cm_fields['P'] != NULL) {
1533                                         oldpath = msg->cm_fields['P'];
1534                                         msg->cm_fields['P'] = NULL;
1535                                 }
1536                                 else {
1537                                         oldpath = strdup("unknown_user");
1538                                 }
1539                                 size = strlen(oldpath) + SIZ;
1540                                 msg->cm_fields['P'] = malloc(size);
1541                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1542                                         config.c_nodename, oldpath);
1543                                 free(oldpath);
1544
1545                                 /* serialize the message */
1546                                 serialize_message(&sermsg, msg);
1547
1548                                 /* now send it */
1549                                 if (IsEmptyStr(nexthop)) {
1550                                         strcpy(nexthop, msg->cm_fields['D']);
1551                                 }
1552                                 snprintf(filename,
1553                                         sizeof filename,
1554                                         "%s/%s@%lx%x",
1555                                         ctdl_netout_dir,
1556                                         nexthop,
1557                                         time(NULL),
1558                                         rand()
1559                                 );
1560                                 CtdlLogPrintf(CTDL_DEBUG, "Appending to %s\n", filename);
1561                                 fp = fopen(filename, "ab");
1562                                 if (fp != NULL) {
1563                                         fwrite(sermsg.ser, sermsg.len, 1, fp);
1564                                         fclose(fp);
1565                                 }
1566                                 else {
1567                                         CtdlLogPrintf(CTDL_ERR, "%s: %s\n", filename, strerror(errno));
1568                                 }
1569                                 free(sermsg.ser);
1570                                 CtdlFreeMessage(msg);
1571                                 return;
1572                         }
1573
1574                         else {  /* invalid destination node name */
1575
1576                                 network_bounce(msg,
1577 "A message you sent could not be delivered due to an invalid destination node"
1578 " name.  Please check the address and try sending the message again.\n");
1579                                 msg = NULL;
1580                                 return;
1581
1582                         }
1583                 }
1584         }
1585
1586         /*
1587          * Check to see if we already have a copy of this message, and
1588          * abort its processing if so.  (We used to post a warning to Aide>
1589          * every time this happened, but the network is now so densely
1590          * connected that it's inevitable.)
1591          */
1592         if (network_usetable(msg) != 0) {
1593                 CtdlFreeMessage(msg);
1594                 return;
1595         }
1596
1597         /* Learn network topology from the path */
1598         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1599                 network_learn_topology(msg->cm_fields['N'], msg->cm_fields['P']);
1600         }
1601
1602         /* Is the sending node giving us a very persuasive suggestion about
1603          * which room this message should be saved in?  If so, go with that.
1604          */
1605         if (msg->cm_fields['C'] != NULL) {
1606                 safestrncpy(target_room, msg->cm_fields['C'], sizeof target_room);
1607         }
1608
1609         /* Otherwise, does it have a recipient?  If so, validate it... */
1610         else if (msg->cm_fields['R'] != NULL) {
1611                 recp = validate_recipients(msg->cm_fields['R'], NULL, 0);
1612                 if (recp != NULL) if (recp->num_error != 0) {
1613                         network_bounce(msg,
1614                                 "A message you sent could not be delivered due to an invalid address.\n"
1615                                 "Please check the address and try sending the message again.\n");
1616                         msg = NULL;
1617                         free_recipients(recp);
1618                         CtdlLogPrintf(CTDL_DEBUG, "Bouncing message due to invalid recipient address.\n");
1619                         return;
1620                 }
1621                 strcpy(target_room, "");        /* no target room if mail */
1622         }
1623
1624         /* Our last shot at finding a home for this message is to see if
1625          * it has the O field (Originating room) set.
1626          */
1627         else if (msg->cm_fields['O'] != NULL) {
1628                 safestrncpy(target_room, msg->cm_fields['O'], sizeof target_room);
1629         }
1630
1631         /* Strip out fields that are only relevant during transit */
1632         if (msg->cm_fields['D'] != NULL) {
1633                 free(msg->cm_fields['D']);
1634                 msg->cm_fields['D'] = NULL;
1635         }
1636         if (msg->cm_fields['C'] != NULL) {
1637                 free(msg->cm_fields['C']);
1638                 msg->cm_fields['C'] = NULL;
1639         }
1640
1641         /* save the message into a room */
1642         if (PerformNetprocHooks(msg, target_room) == 0) {
1643                 msg->cm_flags = CM_SKIP_HOOKS;
1644                 CtdlSubmitMsg(msg, recp, target_room, 0);
1645         }
1646         CtdlFreeMessage(msg);
1647         free_recipients(recp);
1648 }
1649
1650
1651 /*
1652  * Process a single message from a single file from the inbound queue
1653  */
1654 void network_process_message(FILE *fp, long msgstart, long msgend) {
1655         long hold_pos;
1656         long size;
1657         char *buffer;
1658
1659         hold_pos = ftell(fp);
1660         size = msgend - msgstart + 1;
1661         buffer = malloc(size);
1662         if (buffer != NULL) {
1663                 fseek(fp, msgstart, SEEK_SET);
1664                 if (fread(buffer, size, 1, fp) > 0) {
1665                         network_process_buffer(buffer, size);
1666                 }
1667                 free(buffer);
1668         }
1669
1670         fseek(fp, hold_pos, SEEK_SET);
1671 }
1672
1673
1674 /*
1675  * Process a single file from the inbound queue
1676  */
1677 void network_process_file(char *filename) {
1678         FILE *fp;
1679         long msgstart = (-1L);
1680         long msgend = (-1L);
1681         long msgcur = 0L;
1682         int ch;
1683
1684
1685         fp = fopen(filename, "rb");
1686         if (fp == NULL) {
1687                 CtdlLogPrintf(CTDL_CRIT, "Error opening %s: %s\n", filename, strerror(errno));
1688                 return;
1689         }
1690
1691         fseek(fp, 0L, SEEK_END);
1692         CtdlLogPrintf(CTDL_INFO, "network: processing %ld bytes from %s\n", ftell(fp), filename);
1693         rewind(fp);
1694
1695         /* Look for messages in the data stream and break them out */
1696         while (ch = getc(fp), ch >= 0) {
1697
1698                 if (ch == 255) {
1699                         if (msgstart >= 0L) {
1700                                 msgend = msgcur - 1;
1701                                 network_process_message(fp, msgstart, msgend);
1702                         }
1703                         msgstart = msgcur;
1704                 }
1705
1706                 ++msgcur;
1707         }
1708
1709         msgend = msgcur - 1;
1710         if (msgstart >= 0L) {
1711                 network_process_message(fp, msgstart, msgend);
1712         }
1713
1714         fclose(fp);
1715         unlink(filename);
1716 }
1717
1718
1719 /*
1720  * Process anything in the inbound queue
1721  */
1722 void network_do_spoolin(void) {
1723         DIR *dp;
1724         struct dirent *d;
1725         struct stat statbuf;
1726         char filename[PATH_MAX];
1727         static time_t last_spoolin_mtime = 0L;
1728
1729         /*
1730          * Check the spoolin directory's modification time.  If it hasn't
1731          * been touched, we don't need to scan it.
1732          */
1733         if (stat(ctdl_netin_dir, &statbuf)) return;
1734         if (statbuf.st_mtime == last_spoolin_mtime) {
1735                 CtdlLogPrintf(CTDL_DEBUG, "network: nothing in inbound queue\n");
1736                 return;
1737         }
1738         last_spoolin_mtime = statbuf.st_mtime;
1739         CtdlLogPrintf(CTDL_DEBUG, "network: processing inbound queue\n");
1740
1741         /*
1742          * Ok, there's something interesting in there, so scan it.
1743          */
1744         dp = opendir(ctdl_netin_dir);
1745         if (dp == NULL) return;
1746
1747         while (d = readdir(dp), d != NULL) {
1748                 if ((strcmp(d->d_name, ".")) && (strcmp(d->d_name, ".."))) {
1749                         snprintf(filename,
1750                                 sizeof filename,
1751                                 "%s/%s",
1752                                 ctdl_netin_dir,
1753                                 d->d_name
1754                         );
1755                         network_process_file(filename);
1756                 }
1757         }
1758
1759         closedir(dp);
1760 }
1761
1762 /*
1763  * Step 1: consolidate files in the outbound queue into one file per neighbor node
1764  * Step 2: delete any files in the outbound queue that were for neighbors who no longer exist.
1765  */
1766 void network_consolidate_spoolout(void) {
1767         DIR *dp;
1768         struct dirent *d;
1769         char filename[PATH_MAX];
1770         char cmd[PATH_MAX];
1771         char nexthop[256];
1772         int i;
1773         char *ptr;
1774
1775         /* Step 1: consolidate files in the outbound queue into one file per neighbor node */
1776         dp = opendir(ctdl_netout_dir);
1777         if (dp == NULL) return;
1778         while (d = readdir(dp), d != NULL) {
1779                 if (
1780                         (strcmp(d->d_name, "."))
1781                         && (strcmp(d->d_name, ".."))
1782                         && (strchr(d->d_name, '@') != NULL)
1783                 ) {
1784                         safestrncpy(nexthop, d->d_name, sizeof nexthop);
1785                         ptr = strchr(nexthop, '@');
1786                         if (ptr) *ptr = 0;
1787
1788                         snprintf(filename,
1789                                 sizeof filename,
1790                                 "%s/%s",
1791                                 ctdl_netout_dir,
1792                                 d->d_name
1793                         );
1794
1795                         CtdlLogPrintf(CTDL_DEBUG, "Consolidate %s to %s\n", filename, nexthop);
1796                         if (network_talking_to(nexthop, NTT_CHECK)) {
1797                                 CtdlLogPrintf(CTDL_DEBUG,
1798                                         "Currently online with %s - skipping for now\n",
1799                                         nexthop
1800                                 );
1801                         }
1802                         else {
1803                                 network_talking_to(nexthop, NTT_ADD);
1804                                 snprintf(cmd, sizeof cmd, "/bin/cat %s >>%s/%s && /bin/rm -f %s",
1805                                         filename,
1806                                         ctdl_netout_dir, nexthop,
1807                                         filename
1808                                 );
1809                                 system(cmd);
1810                                 network_talking_to(nexthop, NTT_REMOVE);
1811                         }
1812                 }
1813         }
1814         closedir(dp);
1815
1816         /* Step 2: delete any files in the outbound queue that were for neighbors who no longer exist */
1817
1818         dp = opendir(ctdl_netout_dir);
1819         if (dp == NULL) return;
1820
1821         while (d = readdir(dp), d != NULL) {
1822                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
1823                         continue;
1824                 ptr = strchr(d->d_name, '@');
1825                 if (d != NULL)
1826                         continue;
1827                 snprintf(filename,
1828                         sizeof filename,
1829                         "%s/%s",
1830                         ctdl_netout_dir,
1831                         d->d_name
1832                 );
1833
1834                 strcpy(nexthop, "");
1835                 i = is_valid_node(nexthop, NULL, d->d_name);
1836
1837                 if ( (i != 0) || !IsEmptyStr(nexthop) ) {
1838                         unlink(filename);
1839                 }
1840         }
1841
1842
1843         closedir(dp);
1844 }
1845
1846
1847 /*
1848  * receive network spool from the remote system
1849  */
1850 void receive_spool(int *sock, char *remote_nodename) {
1851         long download_len = 0L;
1852         long bytes_received = 0L;
1853         char buf[SIZ];
1854         static char pbuf[IGNET_PACKET_SIZE];
1855         char tempfilename[PATH_MAX];
1856         char permfilename[PATH_MAX];
1857         long plen;
1858         FILE *fp;
1859
1860         snprintf(tempfilename,
1861                 sizeof tempfilename,
1862                 "%s/%s.%lx%x",
1863                 ctdl_nettmp_dir,
1864                 remote_nodename,
1865                 time(NULL),
1866                 rand()
1867         );
1868
1869         snprintf(permfilename,
1870                 sizeof permfilename,
1871                 "%s/%s.%lx%x",
1872                 ctdl_netin_dir,
1873                 remote_nodename,
1874                 time(NULL),
1875                 rand()
1876         );
1877
1878         if (sock_puts(sock, "NDOP") < 0) return;
1879         if (sock_getln(sock, buf, sizeof buf) < 0) return;
1880         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1881         if (buf[0] != '2') {
1882                 return;
1883         }
1884         download_len = extract_long(&buf[4], 0);
1885
1886         if (download_len>0) {
1887                 bytes_received = 0L;
1888                 fp = fopen(tempfilename, "w");
1889                 if (fp == NULL) {
1890                         CtdlLogPrintf(CTDL_CRIT, "cannot open download file locally: %s\n",
1891                                       strerror(errno));
1892                         return;
1893                 }
1894
1895                 CtdlLogPrintf(CTDL_DEBUG, "For this download we are expecting %d bytes\n", download_len);
1896                 while (bytes_received < download_len) {
1897                         /*
1898                          * If shutting down we can exit here and unlink the temp file.
1899                          * this shouldn't loose us any messages.
1900                          */
1901                         if (CtdlThreadCheckStop())
1902                         {
1903                                 fclose(fp);
1904                                 unlink(tempfilename);
1905                                 return;
1906                         }
1907                         snprintf(buf, sizeof buf, "READ %ld|%ld",
1908                                  bytes_received,
1909                                  ((download_len - bytes_received > IGNET_PACKET_SIZE)
1910                                   ? IGNET_PACKET_SIZE : (download_len - bytes_received)));
1911
1912                         if (sock_puts(sock, buf) < 0) {
1913                                 fclose(fp);
1914                                 unlink(tempfilename);
1915                                 return;
1916                         }
1917                         if (sock_getln(sock, buf, sizeof buf) < 0) {
1918                                 fclose(fp);
1919                                 unlink(tempfilename);
1920                                 return;
1921                         }
1922
1923                         if (buf[0] == '6') {
1924                                 plen = extract_long(&buf[4], 0);
1925                                 if (sock_read(sock, pbuf, plen, 1) < 0) {
1926                                         fclose(fp);
1927                                         unlink(tempfilename);
1928                                         return;
1929                                 }
1930                                 fwrite((char *) pbuf, plen, 1, fp);
1931                                 bytes_received = bytes_received + plen;
1932                         }
1933                 }
1934
1935                 fclose(fp);
1936         }
1937         /* Last chance for shutdown exit */
1938         if (CtdlThreadCheckStop())
1939         {
1940                 unlink(tempfilename);
1941                 return;
1942         }
1943
1944         if (sock_puts(sock, "CLOS") < 0) {
1945                 unlink(tempfilename);
1946                 return;
1947         }
1948
1949         /*
1950          * From here on we must complete or messages will get lost
1951          */
1952         if (sock_getln(sock, buf, sizeof buf) < 0) {
1953                 unlink(tempfilename);
1954                 return;
1955         }
1956         if (download_len > 0) {
1957                 CtdlLogPrintf(CTDL_NOTICE, "Received %ld octets from <%s>\n", download_len, remote_nodename);
1958         }
1959         CtdlLogPrintf(CTDL_DEBUG, "%s\n", buf);
1960
1961         /* Now move the temp file to its permanent location.
1962          */
1963         if (link(tempfilename, permfilename) != 0) {
1964                 CtdlLogPrintf(CTDL_ALERT, "Could not link %s to %s: %s\n",
1965                         tempfilename, permfilename, strerror(errno)
1966                 );
1967         }
1968         unlink(tempfilename);
1969 }
1970
1971
1972
1973 /*
1974  * transmit network spool to the remote system
1975  */
1976 void transmit_spool(int *sock, char *remote_nodename)
1977 {
1978         char buf[SIZ];
1979         char pbuf[4096];
1980         long plen;
1981         long bytes_to_write, thisblock, bytes_written;
1982         int fd;
1983         char sfname[128];
1984
1985         if (sock_puts(sock, "NUOP") < 0) return;
1986         if (sock_getln(sock, buf, sizeof buf) < 0) return;
1987         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1988         if (buf[0] != '2') {
1989                 return;
1990         }
1991
1992         snprintf(sfname, sizeof sfname,
1993                 "%s/%s",
1994                 ctdl_netout_dir,
1995                 remote_nodename
1996         );
1997         fd = open(sfname, O_RDONLY);
1998         if (fd < 0) {
1999                 if (errno != ENOENT) {
2000                         CtdlLogPrintf(CTDL_CRIT, "cannot open %s: %s\n", sfname, strerror(errno));
2001                 }
2002                 return;
2003         }
2004         bytes_written = 0;
2005         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
2006                 bytes_to_write = plen;
2007                 while (bytes_to_write > 0L) {
2008                         /* Exit if shutting down */
2009                         if (CtdlThreadCheckStop())
2010                         {
2011                                 close(fd);
2012                                 return;
2013                         }
2014
2015                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
2016                         if (sock_puts(sock, buf) < 0) {
2017                                 close(fd);
2018                                 return;
2019                         }
2020                         if (sock_getln(sock, buf, sizeof buf) < 0) {
2021                                 close(fd);
2022                                 return;
2023                         }
2024                         thisblock = atol(&buf[4]);
2025                         if (buf[0] == '7') {
2026                                 if (sock_write(sock, pbuf, (int) thisblock) < 0) {
2027                                         close(fd);
2028                                         return;
2029                                 }
2030                                 bytes_to_write -= thisblock;
2031                                 bytes_written += thisblock;
2032                         } else {
2033                                 goto ABORTUPL;
2034                         }
2035                 }
2036         }
2037
2038 ABORTUPL:
2039         close(fd);
2040
2041         /* Last chance for shutdown exit */
2042         if(CtdlThreadCheckStop())
2043                 return;
2044
2045         if (sock_puts(sock, "UCLS 1") < 0) return;
2046
2047         /*
2048          * From here on we must complete or messages will get lost
2049          */
2050         if (sock_getln(sock, buf, sizeof buf) < 0) return;
2051         CtdlLogPrintf(CTDL_NOTICE, "Sent %ld octets to <%s>\n", bytes_written, remote_nodename);
2052         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
2053         if (buf[0] == '2') {
2054                 CtdlLogPrintf(CTDL_DEBUG, "Removing <%s>\n", sfname);
2055                 unlink(sfname);
2056         }
2057 }
2058
2059
2060
2061 /*
2062  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
2063  */
2064 void network_poll_node(char *node, char *secret, char *host, char *port) {
2065         int sock;
2066         char buf[SIZ];
2067         char err_buf[SIZ];
2068         char connected_to[SIZ];
2069         CitContext *CCC=CC;
2070
2071         if (network_talking_to(node, NTT_CHECK)) return;
2072         network_talking_to(node, NTT_ADD);
2073         CtdlLogPrintf(CTDL_DEBUG, "network: polling <%s>\n", node);
2074         CtdlLogPrintf(CTDL_NOTICE, "Connecting to <%s> at %s:%s\n", node, host, port);
2075
2076         sock = sock_connect(host, port);
2077         if (sock < 0) {
2078                 CtdlLogPrintf(CTDL_ERR, "Could not connect: %s\n", strerror(errno));
2079                 network_talking_to(node, NTT_REMOVE);
2080                 return;
2081         }
2082
2083         CtdlLogPrintf(CTDL_DEBUG, "Connected!\n");
2084         CCC->sReadBuf = NewStrBuf();
2085         CCC->sMigrateBuf = NewStrBuf();
2086         CCC->sPos = NULL;
2087
2088         /* Read the server greeting */
2089         if (sock_getln(&sock, buf, sizeof buf) < 0) goto bail;
2090         CtdlLogPrintf(CTDL_DEBUG, ">%s\n", buf);
2091
2092         /* Check that the remote is who we think it is and warn the Aide if not */
2093         extract_token (connected_to, buf, 1, ' ', sizeof connected_to);
2094         if (strcmp(connected_to, node))
2095         {
2096                 snprintf(err_buf, sizeof(err_buf),
2097                         "Connected to node \"%s\" but I was expecting to connect to node \"%s\".",
2098                         connected_to, node
2099                 );
2100                 CtdlLogPrintf(CTDL_ERR, "%s\n", err_buf);
2101                 CtdlAideMessage(err_buf, "Network error");
2102         }
2103         else {
2104                 /* We're talking to the correct node.  Now identify ourselves. */
2105                 snprintf(buf, sizeof buf, "NETP %s|%s", config.c_nodename, secret);
2106                 CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
2107                 if (sock_puts(&sock, buf) <0) goto bail;
2108                 if (sock_getln(&sock, buf, sizeof buf) < 0) goto bail;
2109                 CtdlLogPrintf(CTDL_DEBUG, ">%s\n", buf);
2110                 if (buf[0] != '2') {
2111                         goto bail;
2112                 }
2113
2114                 /* At this point we are authenticated. */
2115                 if (!CtdlThreadCheckStop())
2116                         receive_spool(&sock, node);
2117                 if (!CtdlThreadCheckStop())
2118                         transmit_spool(&sock, node);
2119         }
2120
2121         sock_puts(&sock, "QUIT");
2122 bail:
2123         FreeStrBuf(&CCC->sReadBuf);
2124         FreeStrBuf(&CCC->sMigrateBuf);
2125         if (sock != -1)
2126                 sock_close(sock);
2127         network_talking_to(node, NTT_REMOVE);
2128 }
2129
2130
2131
2132 /*
2133  * Poll other Citadel nodes and transfer inbound/outbound network data.
2134  * Set "full" to nonzero to force a poll of every node, or to zero to poll
2135  * only nodes to which we have data to send.
2136  */
2137 void network_poll_other_citadel_nodes(int full_poll) {
2138         int i;
2139         char linebuf[256];
2140         char node[SIZ];
2141         char host[256];
2142         char port[256];
2143         char secret[256];
2144         int poll = 0;
2145         char spoolfile[256];
2146
2147         if (working_ignetcfg == NULL) {
2148                 CtdlLogPrintf(CTDL_DEBUG, "network: no neighbor nodes are configured - not polling.\n");
2149                 return;
2150         }
2151
2152         /* Use the string tokenizer to grab one line at a time */
2153         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
2154                 if(CtdlThreadCheckStop())
2155                         return;
2156                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
2157                 extract_token(node, linebuf, 0, '|', sizeof node);
2158                 extract_token(secret, linebuf, 1, '|', sizeof secret);
2159                 extract_token(host, linebuf, 2, '|', sizeof host);
2160                 extract_token(port, linebuf, 3, '|', sizeof port);
2161                 if ( !IsEmptyStr(node) && !IsEmptyStr(secret)
2162                    && !IsEmptyStr(host) && !IsEmptyStr(port)) {
2163                         poll = full_poll;
2164                         if (poll == 0) {
2165                                 snprintf(spoolfile,
2166                                          sizeof spoolfile,
2167                                          "%s/%s",
2168                                          ctdl_netout_dir,
2169                                          node
2170                                 );
2171                                 if (access(spoolfile, R_OK) == 0) {
2172                                         poll = 1;
2173                                 }
2174                         }
2175                         if (poll) {
2176                                 network_poll_node(node, secret, host, port);
2177                         }
2178                 }
2179         }
2180
2181 }
2182
2183
2184
2185
2186 /*
2187  * It's ok if these directories already exist.  Just fail silently.
2188  */
2189 void create_spool_dirs(void) {
2190         if ((mkdir(ctdl_spool_dir, 0700) != 0) && (errno != EEXIST))
2191                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_spool_dir, strerror(errno));
2192         if (chown(ctdl_spool_dir, CTDLUID, (-1)) != 0)
2193                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_spool_dir, strerror(errno));
2194         if ((mkdir(ctdl_netin_dir, 0700) != 0) && (errno != EEXIST))
2195                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_netin_dir, strerror(errno));
2196         if (chown(ctdl_netin_dir, CTDLUID, (-1)) != 0)
2197                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netin_dir, strerror(errno));
2198         if ((mkdir(ctdl_nettmp_dir, 0700) != 0) && (errno != EEXIST))
2199                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_nettmp_dir, strerror(errno));
2200         if (chown(ctdl_nettmp_dir, CTDLUID, (-1)) != 0)
2201                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_nettmp_dir, strerror(errno));
2202         if ((mkdir(ctdl_netout_dir, 0700) != 0) && (errno != EEXIST))
2203                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_netout_dir, strerror(errno));
2204         if (chown(ctdl_netout_dir, CTDLUID, (-1)) != 0)
2205                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netout_dir, strerror(errno));
2206 }
2207
2208
2209
2210
2211
2212 /*
2213  * network_do_queue()
2214  *
2215  * Run through the rooms doing various types of network stuff.
2216  */
2217 void *network_do_queue(void *args) {
2218         static time_t last_run = 0L;
2219         struct RoomProcList *ptr;
2220         int full_processing = 1;
2221         struct CitContext networkerCC;
2222
2223         /* Give the networker its own private CitContext */
2224         CtdlFillSystemContext(&networkerCC, "network");
2225         citthread_setspecific(MyConKey, (void *)&networkerCC );
2226
2227         /*
2228          * Run the full set of processing tasks no more frequently
2229          * than once every n seconds
2230          */
2231         if ( (time(NULL) - last_run) < config.c_net_freq ) {
2232                 full_processing = 0;
2233                 CtdlLogPrintf(CTDL_DEBUG, "Network full processing in %ld seconds.\n",
2234                         config.c_net_freq - (time(NULL)- last_run)
2235                 );
2236         }
2237
2238         /*
2239          * This is a simple concurrency check to make sure only one queue run
2240          * is done at a time.  We could do this with a mutex, but since we
2241          * don't really require extremely fine granularity here, we'll do it
2242          * with a static variable instead.
2243          */
2244         if (doing_queue) {
2245                 CtdlClearSystemContext();
2246                 return NULL;
2247         }
2248         doing_queue = 1;
2249
2250         /* Load the IGnet Configuration into memory */
2251         load_working_ignetcfg();
2252
2253         /*
2254          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
2255          * then we poll everyone.  Otherwise we only poll nodes we have stuff
2256          * to send to.
2257          */
2258         network_poll_other_citadel_nodes(full_processing);
2259
2260         /*
2261          * Load the network map and filter list into memory.
2262          */
2263         read_network_map();
2264         filterlist = load_filter_list();
2265
2266         /*
2267          * Go ahead and run the queue
2268          */
2269         if (full_processing && !CtdlThreadCheckStop()) {
2270                 CtdlLogPrintf(CTDL_DEBUG, "network: loading outbound queue\n");
2271                 CtdlForEachRoom(network_queue_room, NULL);
2272         }
2273
2274         if (rplist != NULL) {
2275                 CtdlLogPrintf(CTDL_DEBUG, "network: running outbound queue\n");
2276                 while (rplist != NULL && !CtdlThreadCheckStop()) {
2277                         char spoolroomname[ROOMNAMELEN];
2278                         safestrncpy(spoolroomname, rplist->name, sizeof spoolroomname);
2279                         begin_critical_section(S_RPLIST);
2280
2281                         /* pop this record off the list */
2282                         ptr = rplist;
2283                         rplist = rplist->next;
2284                         free(ptr);
2285
2286                         /* invalidate any duplicate entries to prevent double processing */
2287                         for (ptr=rplist; ptr!=NULL; ptr=ptr->next) {
2288                                 if (!strcasecmp(ptr->name, spoolroomname)) {
2289                                         ptr->name[0] = 0;
2290                                 }
2291                         }
2292
2293                         end_critical_section(S_RPLIST);
2294                         if (spoolroomname[0] != 0) {
2295                                 network_spoolout_room(spoolroomname);
2296                         }
2297                 }
2298         }
2299
2300         /* If there is anything in the inbound queue, process it */
2301         if (!CtdlThreadCheckStop()) {
2302                 network_do_spoolin();
2303         }
2304
2305         /* Save the network map back to disk */
2306         write_network_map();
2307
2308         /* Free the filter list in memory */
2309         free_filter_list(filterlist);
2310         filterlist = NULL;
2311
2312         network_consolidate_spoolout();
2313
2314         CtdlLogPrintf(CTDL_DEBUG, "network: queue run completed\n");
2315
2316         if (full_processing) {
2317                 last_run = time(NULL);
2318         }
2319
2320         doing_queue = 0;
2321
2322         /* Reschedule this task to happen again periodically, unless the thread system indicates
2323          * that the server is shutting down.
2324          */
2325         if (!CtdlThreadCheckStop()) {
2326                 CtdlThreadSchedule("IGnet Network", CTDLTHREAD_BIGSTACK,
2327                         network_do_queue, NULL, time(NULL) + 60
2328                 );
2329         }
2330         else {
2331                 CtdlLogPrintf(CTDL_DEBUG, "network: Task STOPPED.\n");
2332         }
2333         CtdlClearSystemContext();
2334         return NULL;
2335 }
2336
2337
2338 /*
2339  * cmd_netp() - authenticate to the server as another Citadel node polling
2340  *            for network traffic
2341  */
2342 void cmd_netp(char *cmdbuf)
2343 {
2344         char node[256];
2345         char pass[256];
2346         int v;
2347
2348         char secret[256];
2349         char nexthop[256];
2350         char err_buf[SIZ];
2351
2352         /* Authenticate */
2353         extract_token(node, cmdbuf, 0, '|', sizeof node);
2354         extract_token(pass, cmdbuf, 1, '|', sizeof pass);
2355
2356         /* load the IGnet Configuration to check node validity */
2357         load_working_ignetcfg();
2358         v = is_valid_node(nexthop, secret, node);
2359
2360         if (v != 0) {
2361                 snprintf(err_buf, sizeof err_buf,
2362                         "An unknown Citadel server called \"%s\" attempted to connect from %s [%s].\n",
2363                         node, CC->cs_host, CC->cs_addr
2364                 );
2365                 CtdlLogPrintf(CTDL_WARNING, err_buf);
2366                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2367                 CtdlAideMessage(err_buf, "IGNet Networking.");
2368                 return;
2369         }
2370
2371         if (strcasecmp(pass, secret)) {
2372                 snprintf(err_buf, sizeof err_buf,
2373                         "A Citadel server at %s [%s] failed to authenticate as network node \"%s\".\n",
2374                         CC->cs_host, CC->cs_addr, node
2375                 );
2376                 CtdlLogPrintf(CTDL_WARNING, err_buf);
2377                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2378                 CtdlAideMessage(err_buf, "IGNet Networking.");
2379                 return;
2380         }
2381
2382         if (network_talking_to(node, NTT_CHECK)) {
2383                 CtdlLogPrintf(CTDL_WARNING, "Duplicate session for network node <%s>", node);
2384                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
2385                 return;
2386         }
2387
2388         safestrncpy(CC->net_node, node, sizeof CC->net_node);
2389         network_talking_to(node, NTT_ADD);
2390         CtdlLogPrintf(CTDL_NOTICE, "Network node <%s> logged in from %s [%s]\n",
2391                 CC->net_node, CC->cs_host, CC->cs_addr
2392         );
2393         cprintf("%d authenticated as network node '%s'\n", CIT_OK, CC->net_node);
2394 }
2395
2396
2397 int network_room_handler (struct ctdlroom *room)
2398 {
2399         network_queue_room(room, NULL);
2400         return 0;
2401 }
2402
2403
2404 /*
2405  * Module entry point
2406  */
2407 CTDL_MODULE_INIT(network)
2408 {
2409         if (!threading)
2410         {
2411                 create_spool_dirs();
2412                 CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
2413                 CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
2414                 CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
2415                 CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
2416                 CtdlRegisterRoomHook(network_room_handler);
2417                 CtdlRegisterCleanupHook(destroy_network_queue_room);
2418         }
2419         else
2420                 CtdlThreadSchedule("IGnet Network", CTDLTHREAD_BIGSTACK, network_do_queue, NULL, 0);
2421         /* return our Subversion id for the Log */
2422         return "network";
2423 }