citadel/modules/network/serv_network.c

   1 /*
   2  * $Id$
   3  *
   4  * This module handles shared rooms, inter-Citadel mail, and outbound
   5  * mailing list processing.
   6  *
   7  * Copyright (c) 2000-2010 by the citadel.org team
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 3 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  24  * This is a fairly high-level type of critical section.  It ensures that no
  25  * two threads work on the netconfigs files at the same time.  Since we do
  26  * so many things inside these, here are the rules:
  27  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  28  *  2. Do *not* perform any I/O with the client during these sections.
  29  *
  30  */
  31
  32 /*
  33  * Duration of time (in seconds) after which pending list subscribe/unsubscribe
  34  * requests that have not been confirmed will be deleted.
  35  */
  36 #define EXP     259200  /* three days */
  37
  38 #include "sysdep.h"
  39 #include <stdlib.h>
  40 #include <unistd.h>
  41 #include <stdio.h>
  42 #include <fcntl.h>
  43 #include <ctype.h>
  44 #include <signal.h>
  45 #include <pwd.h>
  46 #include <errno.h>
  47 #include <sys/stat.h>
  48 #include <sys/types.h>
  49 #include <dirent.h>
  50 #if TIME_WITH_SYS_TIME
  51 # include <sys/time.h>
  52 # include <time.h>
  53 #else
  54 # if HAVE_SYS_TIME_H
  55 #  include <sys/time.h>
  56 # else
  57 #  include <time.h>
  58 # endif
  59 #endif
  60 #ifdef HAVE_SYSCALL_H
  61 # include <syscall.h>
  62 #else
  63 # if HAVE_SYS_SYSCALL_H
  64 #  include <sys/syscall.h>
  65 # endif
  66 #endif
  67
  68 #include <sys/wait.h>
  69 #include <string.h>
  70 #include <limits.h>
  71 #include <libcitadel.h>
  72 #include "citadel.h"
  73 #include "server.h"
  74 #include "citserver.h"
  75 #include "support.h"
  76 #include "config.h"
  77 #include "user_ops.h"
  78 #include "database.h"
  79 #include "msgbase.h"
  80 #include "internet_addressing.h"
  81 #include "serv_network.h"
  82 #include "clientsocket.h"
  83 #include "file_ops.h"
  84 #include "citadel_dirs.h"
  85 #include "threads.h"
  86
  87 #ifndef HAVE_SNPRINTF
  88 #include "snprintf.h"
  89 #endif
  90
  91 #include "context.h"
  92
  93 #include "ctdl_module.h"
  94
  95
  96
  97 /* Nonzero while we are doing network processing */
  98 static int doing_queue = 0;
  99
 100 /*
 101  * When we do network processing, it's accomplished in two passes; one to
 102  * gather a list of rooms and one to actually do them.  It's ok that rplist
 103  * is global; we have a mutex that keeps it safe.
 104  */
 105 struct RoomProcList *rplist = NULL;
 106
 107 /*
 108  * We build a map of network nodes during processing.
 109  */
 110 NetMap *the_netmap = NULL;
 111 int netmap_changed = 0;
 112 char *working_ignetcfg = NULL;
 113
 114 /*
 115  * Load or refresh the Citadel network (IGnet) configuration for this node.
 116  */
 117 void load_working_ignetcfg(void) {
 118         char *cfg;
 119         char *oldcfg;
 120
 121         cfg = CtdlGetSysConfig(IGNETCFG);
 122         if (cfg == NULL) {
 123                 cfg = strdup("");
 124         }
 125
 126         oldcfg = working_ignetcfg;
 127         working_ignetcfg = cfg;
 128         if (oldcfg != NULL) {
 129                 free(oldcfg);
 130         }
 131 }
 132
 133
 134
 135
 136
 137 /*
 138  * Keep track of what messages to reject
 139  */
 140 FilterList *load_filter_list(void) {
 141         char *serialized_list = NULL;
 142         int i;
 143         char buf[SIZ];
 144         FilterList *newlist = NULL;
 145         FilterList *nptr;
 146
 147         serialized_list = CtdlGetSysConfig(FILTERLIST);
 148         if (serialized_list == NULL) return(NULL); /* if null, no entries */
 149
 150         /* Use the string tokenizer to grab one line at a time */
 151         for (i=0; i<num_tokens(serialized_list, '\n'); ++i) {
 152                 extract_token(buf, serialized_list, i, '\n', sizeof buf);
 153                 nptr = (FilterList *) malloc(sizeof(FilterList));
 154                 extract_token(nptr->fl_user, buf, 0, '|', sizeof nptr->fl_user);
 155                 striplt(nptr->fl_user);
 156                 extract_token(nptr->fl_room, buf, 1, '|', sizeof nptr->fl_room);
 157                 striplt(nptr->fl_room);
 158                 extract_token(nptr->fl_node, buf, 2, '|', sizeof nptr->fl_node);
 159                 striplt(nptr->fl_node);
 160
 161                 /* Cowardly refuse to add an any/any/any entry that would
 162                  * end up filtering every single message.
 163                  */
 164                 if (IsEmptyStr(nptr->fl_user) &&
 165                     IsEmptyStr(nptr->fl_room) &&
 166                     IsEmptyStr(nptr->fl_node)) {
 167                         free(nptr);
 168                 }
 169                 else {
 170                         nptr->next = newlist;
 171                         newlist = nptr;
 172                 }
 173         }
 174
 175         free(serialized_list);
 176         return newlist;
 177 }
 178
 179
 180 void free_filter_list(FilterList *fl) {
 181         if (fl == NULL) return;
 182         free_filter_list(fl->next);
 183         free(fl);
 184 }
 185
 186
 187
 188 /*
 189  * Check the use table.  This is a list of messages which have recently
 190  * arrived on the system.  It is maintained and queried to prevent the same
 191  * message from being entered into the database multiple times if it happens
 192  * to arrive multiple times by accident.
 193  */
 194 int network_usetable(struct CtdlMessage *msg) {
 195
 196         char msgid[SIZ];
 197         struct cdbdata *cdbut;
 198         struct UseTable ut;
 199
 200         /* Bail out if we can't generate a message ID */
 201         if (msg == NULL) {
 202                 return(0);
 203         }
 204         if (msg->cm_fields['I'] == NULL) {
 205                 return(0);
 206         }
 207         if (IsEmptyStr(msg->cm_fields['I'])) {
 208                 return(0);
 209         }
 210
 211         /* Generate the message ID */
 212         strcpy(msgid, msg->cm_fields['I']);
 213         if (haschar(msgid, '@') == 0) {
 214                 strcat(msgid, "@");
 215                 if (msg->cm_fields['N'] != NULL) {
 216                         strcat(msgid, msg->cm_fields['N']);
 217                 }
 218                 else {
 219                         return(0);
 220                 }
 221         }
 222
 223         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 224         if (cdbut != NULL) {
 225                 cdb_free(cdbut);
 226                 CtdlLogPrintf(CTDL_DEBUG, "network_usetable() : we already have %s\n", msgid);
 227                 return(1);
 228         }
 229
 230         /* If we got to this point, it's unique: add it. */
 231         strcpy(ut.ut_msgid, msgid);
 232         ut.ut_timestamp = time(NULL);
 233         cdb_store(CDB_USETABLE, msgid, strlen(msgid), &ut, sizeof(struct UseTable) );
 234         return(0);
 235 }
 236
 237
 238 /*
 239  * Read the network map from its configuration file into memory.
 240  */
 241 void read_network_map(void) {
 242         char *serialized_map = NULL;
 243         int i;
 244         char buf[SIZ];
 245         NetMap *nmptr;
 246
 247         serialized_map = CtdlGetSysConfig(IGNETMAP);
 248         if (serialized_map == NULL) return;     /* if null, no entries */
 249
 250         /* Use the string tokenizer to grab one line at a time */
 251         for (i=0; i<num_tokens(serialized_map, '\n'); ++i) {
 252                 extract_token(buf, serialized_map, i, '\n', sizeof buf);
 253                 nmptr = (NetMap *) malloc(sizeof(NetMap));
 254                 extract_token(nmptr->nodename, buf, 0, '|', sizeof nmptr->nodename);
 255                 nmptr->lastcontact = extract_long(buf, 1);
 256                 extract_token(nmptr->nexthop, buf, 2, '|', sizeof nmptr->nexthop);
 257                 nmptr->next = the_netmap;
 258                 the_netmap = nmptr;
 259         }
 260
 261         free(serialized_map);
 262         netmap_changed = 0;
 263 }
 264
 265
 266 /*
 267  * Write the network map from memory back to the configuration file.
 268  */
 269 void write_network_map(void) {
 270         char *serialized_map = NULL;
 271         NetMap *nmptr;
 272
 273
 274         if (netmap_changed) {
 275                 serialized_map = strdup("");
 276
 277                 if (the_netmap != NULL) {
 278                         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 279                                 serialized_map = realloc(serialized_map,
 280                                                         (strlen(serialized_map)+SIZ) );
 281                                 if (!IsEmptyStr(nmptr->nodename)) {
 282                                         snprintf(&serialized_map[strlen(serialized_map)],
 283                                                 SIZ,
 284                                                 "%s|%ld|%s\n",
 285                                                 nmptr->nodename,
 286                                                 (long)nmptr->lastcontact,
 287                                                 nmptr->nexthop);
 288                                 }
 289                         }
 290                 }
 291
 292                 CtdlPutSysConfig(IGNETMAP, serialized_map);
 293                 free(serialized_map);
 294         }
 295
 296         /* Now free the list */
 297         while (the_netmap != NULL) {
 298                 nmptr = the_netmap->next;
 299                 free(the_netmap);
 300                 the_netmap = nmptr;
 301         }
 302         netmap_changed = 0;
 303 }
 304
 305
 306
 307 /*
 308  * Check the network map and determine whether the supplied node name is
 309  * valid.  If it is not a neighbor node, supply the name of a neighbor node
 310  * which is the next hop.  If it *is* a neighbor node, we also fill in the
 311  * shared secret.
 312  */
 313 int is_valid_node(char *nexthop, char *secret, char *node) {
 314         int i;
 315         char linebuf[SIZ];
 316         char buf[SIZ];
 317         int retval;
 318         NetMap *nmptr;
 319
 320         if (node == NULL) {
 321                 return(-1);
 322         }
 323
 324         /*
 325          * First try the neighbor nodes
 326          */
 327         if (working_ignetcfg == NULL) {
 328                 CtdlLogPrintf(CTDL_ERR, "working_ignetcfg is NULL!\n");
 329                 if (nexthop != NULL) {
 330                         strcpy(nexthop, "");
 331                 }
 332                 return(-1);
 333         }
 334
 335         retval = (-1);
 336         if (nexthop != NULL) {
 337                 strcpy(nexthop, "");
 338         }
 339
 340         /* Use the string tokenizer to grab one line at a time */
 341         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
 342                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
 343                 extract_token(buf, linebuf, 0, '|', sizeof buf);
 344                 if (!strcasecmp(buf, node)) {
 345                         if (nexthop != NULL) {
 346                                 strcpy(nexthop, "");
 347                         }
 348                         if (secret != NULL) {
 349                                 extract_token(secret, linebuf, 1, '|', 256);
 350                         }
 351                         retval = 0;
 352                 }
 353         }
 354
 355         if (retval == 0) {
 356                 return(retval);         /* yup, it's a direct neighbor */
 357         }
 358
 359         /*
 360          * If we get to this point we have to see if we know the next hop
 361          */
 362         if (the_netmap != NULL) {
 363                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 364                         if (!strcasecmp(nmptr->nodename, node)) {
 365                                 if (nexthop != NULL) {
 366                                         strcpy(nexthop, nmptr->nexthop);
 367                                 }
 368                                 return(0);
 369                         }
 370                 }
 371         }
 372
 373         /*
 374          * If we get to this point, the supplied node name is bogus.
 375          */
 376         CtdlLogPrintf(CTDL_ERR, "Invalid node name <%s>\n", node);
 377         return(-1);
 378 }
 379
 380
 381
 382
 383
 384 void cmd_gnet(char *argbuf) {
 385         char filename[PATH_MAX];
 386         char buf[SIZ];
 387         FILE *fp;
 388
 389         if ( (CC->room.QRflags & QR_MAILBOX) && (CC->user.usernum == atol(CC->room.QRname)) ) {
 390                 /* users can edit the netconfigs for their own mailbox rooms */
 391         }
 392         else if (CtdlAccessCheck(ac_room_aide)) return;
 393
 394         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 395         cprintf("%d Network settings for room #%ld <%s>\n",
 396                 LISTING_FOLLOWS,
 397                 CC->room.QRnumber, CC->room.QRname);
 398
 399         fp = fopen(filename, "r");
 400         if (fp != NULL) {
 401                 while (fgets(buf, sizeof buf, fp) != NULL) {
 402                         buf[strlen(buf)-1] = 0;
 403                         cprintf("%s\n", buf);
 404                 }
 405                 fclose(fp);
 406         }
 407
 408         cprintf("000\n");
 409 }
 410
 411
 412 void cmd_snet(char *argbuf) {
 413         char tempfilename[PATH_MAX];
 414         char filename[PATH_MAX];
 415         int TmpFD;
 416         StrBuf *Line;
 417         struct stat StatBuf;
 418         long len;
 419         int rc;
 420
 421         unbuffer_output();
 422
 423         if ( (CC->room.QRflags & QR_MAILBOX) && (CC->user.usernum == atol(CC->room.QRname)) ) {
 424                 /* users can edit the netconfigs for their own mailbox rooms */
 425         }
 426         else if (CtdlAccessCheck(ac_room_aide)) return;
 427
 428         len = assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 429         memcpy(tempfilename, filename, len + 1);
 430
 431         memset(&StatBuf, 0, sizeof(struct stat));
 432         if ((stat(filename, &StatBuf)  == -1) || (StatBuf.st_size == 0))
 433                 StatBuf.st_size = 80; /* Not there or empty? guess 80 chars line. */
 434
 435         sprintf(tempfilename + len, ".%d", CC->cs_pid);
 436         errno = 0;
 437         TmpFD = open(tempfilename, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
 438
 439         if ((TmpFD > 0) && (errno == 0))
 440         {
 441                 char *tmp = malloc(StatBuf.st_size * 2);
 442                 memset(tmp, ' ', StatBuf.st_size * 2);
 443                 rc = write(TmpFD, tmp, StatBuf.st_size * 2);
 444                 free(tmp);
 445                 if ((rc <= 0) || (rc != StatBuf.st_size * 2))
 446                 {
 447                         close(TmpFD);
 448                         cprintf("%d Unable to allocate the space required for %s: %s\n",
 449                                 ERROR + INTERNAL_ERROR,
 450                                 tempfilename,
 451                                 strerror(errno));
 452                         unlink(tempfilename);
 453                         return;
 454                 }
 455                 lseek(TmpFD, SEEK_SET, 0);
 456         }
 457         else {
 458                 cprintf("%d Unable to allocate the space required for %s: %s\n",
 459                         ERROR + INTERNAL_ERROR,
 460                         tempfilename,
 461                         strerror(errno));
 462                 unlink(tempfilename);
 463         }
 464         Line = NewStrBuf();
 465
 466         cprintf("%d %s\n", SEND_LISTING, tempfilename);
 467
 468         len = 0;
 469         while (rc = CtdlClientGetLine(Line),
 470                (rc >= 0))
 471         {
 472                 if ((rc == 3) && (strcmp(ChrPtr(Line), "000") == 0))
 473                         break;
 474                 StrBufAppendBufPlain(Line, HKEY("\n"), 0);
 475                 write(TmpFD, ChrPtr(Line), StrLength(Line));
 476                 len += StrLength(Line);
 477         }
 478         FreeStrBuf(&Line);
 479         ftruncate(TmpFD, len);
 480         close(TmpFD);
 481
 482         /* Now copy the temp file to its permanent location.
 483          * (We copy instead of link because they may be on different filesystems)
 484          */
 485         begin_critical_section(S_NETCONFIGS);
 486         rename(tempfilename, filename);
 487         end_critical_section(S_NETCONFIGS);
 488 }
 489
 490
 491 /*
 492  * Deliver digest messages
 493  */
 494 void network_deliver_digest(SpoolControl *sc) {
 495         char buf[SIZ];
 496         int i;
 497         struct CtdlMessage *msg = NULL;
 498         long msglen;
 499         char *recps = NULL;
 500         size_t recps_len = SIZ;
 501         size_t siz;
 502         struct recptypes *valid;
 503         namelist *nptr;
 504         char bounce_to[256];
 505
 506         if (sc->num_msgs_spooled < 1) {
 507                 fclose(sc->digestfp);
 508                 sc->digestfp = NULL;
 509                 return;
 510         }
 511
 512         msg = malloc(sizeof(struct CtdlMessage));
 513         memset(msg, 0, sizeof(struct CtdlMessage));
 514         msg->cm_magic = CTDLMESSAGE_MAGIC;
 515         msg->cm_format_type = FMT_RFC822;
 516         msg->cm_anon_type = MES_NORMAL;
 517
 518         sprintf(buf, "%ld", time(NULL));
 519         msg->cm_fields['T'] = strdup(buf);
 520         msg->cm_fields['A'] = strdup(CC->room.QRname);
 521         snprintf(buf, sizeof buf, "[%s]", CC->room.QRname);
 522         msg->cm_fields['U'] = strdup(buf);
 523         sprintf(buf, "room_%s@%s", CC->room.QRname, config.c_fqdn);
 524         for (i=0; buf[i]; ++i) {
 525                 if (isspace(buf[i])) buf[i]='_';
 526                 buf[i] = tolower(buf[i]);
 527         }
 528         msg->cm_fields['F'] = strdup(buf);
 529         msg->cm_fields['R'] = strdup(buf);
 530
 531         /* Set the 'List-ID' header */
 532         msg->cm_fields['L'] = malloc(1024);
 533         snprintf(msg->cm_fields['L'], 1024,
 534                 "%s <%ld.list-id.%s>",
 535                 CC->room.QRname,
 536                 CC->room.QRnumber,
 537                 config.c_fqdn
 538         );
 539
 540         /*
 541          * Go fetch the contents of the digest
 542          */
 543         fseek(sc->digestfp, 0L, SEEK_END);
 544         msglen = ftell(sc->digestfp);
 545
 546         msg->cm_fields['M'] = malloc(msglen + 1);
 547         fseek(sc->digestfp, 0L, SEEK_SET);
 548         siz = fread(msg->cm_fields['M'], (size_t)msglen, 1, sc->digestfp);
 549         msg->cm_fields['M'][msglen] = '\0';
 550
 551         fclose(sc->digestfp);
 552         sc->digestfp = NULL;
 553
 554         /* Now generate the delivery instructions */
 555
 556         /*
 557          * Figure out how big a buffer we need to allocate
 558          */
 559         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 560                 recps_len = recps_len + strlen(nptr->name) + 2;
 561         }
 562
 563         recps = malloc(recps_len);
 564
 565         if (recps == NULL) {
 566                 CtdlLogPrintf(CTDL_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 567                 abort();
 568         }
 569
 570         strcpy(recps, "");
 571
 572         /* Each recipient */
 573         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 574                 if (nptr != sc->digestrecps) {
 575                         strcat(recps, ",");
 576                 }
 577                 strcat(recps, nptr->name);
 578         }
 579
 580         /* Where do we want bounces and other noise to be heard?  Surely not the list members! */
 581         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 582
 583         /* Now submit the message */
 584         valid = validate_recipients(recps, NULL, 0);
 585         free(recps);
 586         if (valid != NULL) {
 587                 valid->bounce_to = strdup(bounce_to);
 588                 valid->envelope_from = strdup(bounce_to);
 589                 CtdlSubmitMsg(msg, valid, NULL, 0);
 590         }
 591         CtdlFreeMessage(msg);
 592         free_recipients(valid);
 593 }
 594
 595
 596 /*
 597  * Deliver list messages to everyone on the list ... efficiently
 598  */
 599 void network_deliver_list(struct CtdlMessage *msg, SpoolControl *sc) {
 600         char *recps = NULL;
 601         size_t recps_len = SIZ;
 602         struct recptypes *valid;
 603         namelist *nptr;
 604         char bounce_to[256];
 605
 606         /* Don't do this if there were no recipients! */
 607         if (sc->listrecps == NULL) return;
 608
 609         /* Now generate the delivery instructions */
 610
 611         /*
 612          * Figure out how big a buffer we need to allocate
 613          */
 614         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 615                 recps_len = recps_len + strlen(nptr->name) + 2;
 616         }
 617
 618         recps = malloc(recps_len);
 619
 620         if (recps == NULL) {
 621                 CtdlLogPrintf(CTDL_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 622                 abort();
 623         }
 624
 625         strcpy(recps, "");
 626
 627         /* Each recipient */
 628         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 629                 if (nptr != sc->listrecps) {
 630                         strcat(recps, ",");
 631                 }
 632                 strcat(recps, nptr->name);
 633         }
 634
 635         /* Where do we want bounces and other noise to be heard?  Surely not the list members! */
 636         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 637
 638         /* Now submit the message */
 639         valid = validate_recipients(recps, NULL, 0);
 640         free(recps);
 641         if (valid != NULL) {
 642                 valid->bounce_to = strdup(bounce_to);
 643                 valid->envelope_from = strdup(bounce_to);
 644                 CtdlSubmitMsg(msg, valid, NULL, 0);
 645                 free_recipients(valid);
 646         }
 647         /* Do not call CtdlFreeMessage(msg) here; the caller will free it. */
 648 }
 649
 650
 651
 652
 653 /*
 654  * Spools out one message from the list.
 655  */
 656 void network_spool_msg(long msgnum, void *userdata) {
 657         SpoolControl *sc;
 658         int i;
 659         char *newpath = NULL;
 660         size_t instr_len = SIZ;
 661         struct CtdlMessage *msg = NULL;
 662         namelist *nptr;
 663         maplist *mptr;
 664         struct ser_ret sermsg;
 665         FILE *fp;
 666         char filename[PATH_MAX];
 667         char buf[SIZ];
 668         int bang = 0;
 669         int send = 1;
 670         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 671         int ok_to_participate = 0;
 672         struct recptypes *valid;
 673
 674         sc = (SpoolControl *)userdata;
 675
 676         /*
 677          * Process mailing list recipients
 678          */
 679         instr_len = SIZ;
 680         if (sc->listrecps != NULL) {
 681                 /* Fetch the message.  We're going to need to modify it
 682                  * in order to insert the [list name] in it, etc.
 683                  */
 684                 msg = CtdlFetchMessage(msgnum, 1);
 685                 if (msg != NULL) {
 686                         if (msg->cm_fields['V'] == NULL){
 687                                 /* local message, no enVelope */
 688                                 StrBuf *Buf;
 689                                 Buf = NewStrBuf();
 690                                 StrBufAppendBufPlain(Buf, msg->cm_fields['O'], -1, 0);
 691                                 StrBufAppendBufPlain(Buf, HKEY("@"), 0);
 692                                 StrBufAppendBufPlain(Buf, config.c_fqdn, -1, 0);
 693
 694                                 msg->cm_fields['K'] = SmashStrBuf(&Buf);
 695                         }
 696                         else {
 697                                 msg->cm_fields['K'] = strdup (msg->cm_fields['V']);
 698                         }
 699                         /* Set the 'List-ID' header */
 700                         if (msg->cm_fields['L'] != NULL) {
 701                                 free(msg->cm_fields['L']);
 702                         }
 703                         msg->cm_fields['L'] = malloc(1024);
 704                         snprintf(msg->cm_fields['L'], 1024,
 705                                 "%s <%ld.list-id.%s>",
 706                                 CC->room.QRname,
 707                                 CC->room.QRnumber,
 708                                 config.c_fqdn
 709                         );
 710
 711                         /* Prepend "[List name]" to the subject */
 712                         if (msg->cm_fields['U'] == NULL) {
 713                                 msg->cm_fields['U'] = strdup("(no subject)");
 714                         }
 715                         snprintf(buf, sizeof buf, "[%s] %s", CC->room.QRname, msg->cm_fields['U']);
 716                         free(msg->cm_fields['U']);
 717                         msg->cm_fields['U'] = strdup(buf);
 718
 719                         /* Set the recipient of the list message to the
 720                          * email address of the room itself.
 721                          * FIXME ... I want to be able to pick any address
 722                          */
 723                         if (msg->cm_fields['R'] != NULL) {
 724                                 free(msg->cm_fields['R']);
 725                         }
 726                         msg->cm_fields['R'] = malloc(256);
 727                         snprintf(msg->cm_fields['R'], 256,
 728                                 "room_%s@%s", CC->room.QRname,
 729                                 config.c_fqdn);
 730                         for (i=0; msg->cm_fields['R'][i]; ++i) {
 731                                 if (isspace(msg->cm_fields['R'][i])) {
 732                                         msg->cm_fields['R'][i] = '_';
 733                                 }
 734                         }
 735
 736                         /* Handle delivery */
 737                         network_deliver_list(msg, sc);
 738                         CtdlFreeMessage(msg);
 739                 }
 740         }
 741
 742         /*
 743          * Process digest recipients
 744          */
 745         if ((sc->digestrecps != NULL) && (sc->digestfp != NULL)) {
 746                 msg = CtdlFetchMessage(msgnum, 1);
 747                 if (msg != NULL) {
 748                         fprintf(sc->digestfp,   " -----------------------------------"
 749                                                 "------------------------------------"
 750                                                 "-------\n");
 751                         fprintf(sc->digestfp, "From: ");
 752                         if (msg->cm_fields['A'] != NULL) {
 753                                 fprintf(sc->digestfp, "%s ", msg->cm_fields['A']);
 754                         }
 755                         if (msg->cm_fields['F'] != NULL) {
 756                                 fprintf(sc->digestfp, "<%s> ", msg->cm_fields['F']);
 757                         }
 758                         else if (msg->cm_fields['N'] != NULL) {
 759                                 fprintf(sc->digestfp, "@%s ", msg->cm_fields['N']);
 760                         }
 761                         fprintf(sc->digestfp, "\n");
 762                         if (msg->cm_fields['U'] != NULL) {
 763                                 fprintf(sc->digestfp, "Subject: %s\n", msg->cm_fields['U']);
 764                         }
 765
 766                         CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 767
 768                         safestrncpy(CC->preferred_formats, "text/plain", sizeof CC->preferred_formats);
 769                         CtdlOutputPreLoadedMsg(msg, MT_CITADEL, HEADERS_NONE, 0, 0, 0);
 770
 771                         StrBufTrim(CC->redirect_buffer);
 772                         fwrite(HKEY("\n"), 1, sc->digestfp);
 773                         fwrite(SKEY(CC->redirect_buffer), 1, sc->digestfp);
 774                         fwrite(HKEY("\n"), 1, sc->digestfp);
 775
 776                         FreeStrBuf(&CC->redirect_buffer);
 777
 778                         sc->num_msgs_spooled += 1;
 779                         free(msg);
 780                 }
 781         }
 782
 783         /*
 784          * Process client-side list participations for this room
 785          */
 786         instr_len = SIZ;
 787         if (sc->participates != NULL) {
 788                 msg = CtdlFetchMessage(msgnum, 1);
 789                 if (msg != NULL) {
 790
 791                         /* Only send messages which originated on our own Citadel
 792                          * network, otherwise we'll end up sending the remote
 793                          * mailing list's messages back to it, which is rude...
 794                          */
 795                         ok_to_participate = 0;
 796                         if (msg->cm_fields['N'] != NULL) {
 797                                 if (!strcasecmp(msg->cm_fields['N'], config.c_nodename)) {
 798                                         ok_to_participate = 1;
 799                                 }
 800                                 if (is_valid_node(NULL, NULL, msg->cm_fields['N']) == 0) {
 801                                         ok_to_participate = 1;
 802                                 }
 803                         }
 804                         if (ok_to_participate) {
 805                                 if (msg->cm_fields['F'] != NULL) {
 806                                         free(msg->cm_fields['F']);
 807                                 }
 808                                 msg->cm_fields['F'] = malloc(SIZ);
 809                                 /* Replace the Internet email address of the actual
 810                                 * author with the email address of the room itself,
 811                                 * so the remote listserv doesn't reject us.
 812                                 * FIXME ... I want to be able to pick any address
 813                                 */
 814                                 snprintf(msg->cm_fields['F'], SIZ,
 815                                         "room_%s@%s", CC->room.QRname,
 816                                         config.c_fqdn);
 817                                 for (i=0; msg->cm_fields['F'][i]; ++i) {
 818                                         if (isspace(msg->cm_fields['F'][i])) {
 819                                                 msg->cm_fields['F'][i] = '_';
 820                                         }
 821                                 }
 822
 823                                 /*
 824                                  * Figure out how big a buffer we need to allocate
 825                                  */
 826                                 for (nptr = sc->participates; nptr != NULL; nptr = nptr->next) {
 827
 828                                         if (msg->cm_fields['R'] == NULL) {
 829                                                 free(msg->cm_fields['R']);
 830                                         }
 831                                         msg->cm_fields['R'] = strdup(nptr->name);
 832
 833                                         valid = validate_recipients(nptr->name, NULL, 0);
 834                                         CtdlSubmitMsg(msg, valid, "", 0);
 835                                         free_recipients(valid);
 836                                 }
 837
 838                         }
 839                         CtdlFreeMessage(msg);
 840                 }
 841         }
 842
 843         /*
 844          * Process IGnet push shares
 845          */
 846         msg = CtdlFetchMessage(msgnum, 1);
 847         if (msg != NULL) {
 848                 size_t newpath_len;
 849
 850                 /* Prepend our node name to the Path field whenever
 851                  * sending a message to another IGnet node
 852                  */
 853                 if (msg->cm_fields['P'] == NULL) {
 854                         msg->cm_fields['P'] = strdup("username");
 855                 }
 856                 newpath_len = strlen(msg->cm_fields['P']) +
 857                          strlen(config.c_nodename) + 2;
 858                 newpath = malloc(newpath_len);
 859                 snprintf(newpath, newpath_len, "%s!%s",
 860                          config.c_nodename, msg->cm_fields['P']);
 861                 free(msg->cm_fields['P']);
 862                 msg->cm_fields['P'] = newpath;
 863
 864                 /*
 865                  * Determine if this message is set to be deleted
 866                  * after sending out on the network
 867                  */
 868                 if (msg->cm_fields['S'] != NULL) {
 869                         if (!strcasecmp(msg->cm_fields['S'], "CANCEL")) {
 870                                 delete_after_send = 1;
 871                         }
 872                 }
 873
 874                 /* Now send it to every node */
 875                 if (sc->ignet_push_shares != NULL)
 876                   for (mptr = sc->ignet_push_shares; mptr != NULL;
 877                     mptr = mptr->next) {
 878
 879                         send = 1;
 880
 881                         /* Check for valid node name */
 882                         if (is_valid_node(NULL, NULL, mptr->remote_nodename) != 0) {
 883                                 CtdlLogPrintf(CTDL_ERR, "Invalid node <%s>\n", mptr->remote_nodename);
 884                                 send = 0;
 885                         }
 886
 887                         /* Check for split horizon */
 888                         CtdlLogPrintf(CTDL_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 889                         bang = num_tokens(msg->cm_fields['P'], '!');
 890                         if (bang > 1) for (i=0; i<(bang-1); ++i) {
 891                                 extract_token(buf, msg->cm_fields['P'], i, '!', sizeof buf);
 892                                 CtdlLogPrintf(CTDL_DEBUG, "Compare <%s> to <%s>\n",
 893                                         buf, mptr->remote_nodename) ;
 894                                 if (!strcasecmp(buf, mptr->remote_nodename)) {
 895                                         send = 0;
 896                                         CtdlLogPrintf(CTDL_DEBUG, "Not sending to %s\n",
 897                                                 mptr->remote_nodename);
 898                                 }
 899                                 else {
 900                                         CtdlLogPrintf(CTDL_DEBUG, "Sending to %s\n", mptr->remote_nodename);
 901                                 }
 902                         }
 903
 904                         /* Send the message */
 905                         if (send == 1) {
 906
 907                                 /*
 908                                  * Force the message to appear in the correct room
 909                                  * on the far end by setting the C field correctly
 910                                  */
 911                                 if (msg->cm_fields['C'] != NULL) {
 912                                         free(msg->cm_fields['C']);
 913                                 }
 914                                 if (!IsEmptyStr(mptr->remote_roomname)) {
 915                                         msg->cm_fields['C'] = strdup(mptr->remote_roomname);
 916                                 }
 917                                 else {
 918                                         msg->cm_fields['C'] = strdup(CC->room.QRname);
 919                                 }
 920
 921                                 /* serialize it for transmission */
 922                                 serialize_message(&sermsg, msg);
 923                                 if (sermsg.len > 0) {
 924
 925                                         /* write it to a spool file */
 926                                         snprintf(filename, sizeof filename,"%s/%s@%lx%x",
 927                                                 ctdl_netout_dir,
 928                                                 mptr->remote_nodename,
 929                                                 time(NULL),
 930                                                 rand()
 931                                         );
 932                                         CtdlLogPrintf(CTDL_DEBUG, "Appending to %s\n", filename);
 933                                         fp = fopen(filename, "ab");
 934                                         if (fp != NULL) {
 935                                                 fwrite(sermsg.ser,
 936                                                         sermsg.len, 1, fp);
 937                                                 fclose(fp);
 938                                         }
 939                                         else {
 940                                                 CtdlLogPrintf(CTDL_ERR, "%s: %s\n", filename, strerror(errno));
 941                                         }
 942
 943                                         /* free the serialized version */
 944                                         free(sermsg.ser);
 945                                 }
 946
 947                         }
 948                 }
 949                 CtdlFreeMessage(msg);
 950         }
 951
 952         /* update lastsent */
 953         sc->lastsent = msgnum;
 954
 955         /* Delete this message if delete-after-send is set */
 956         if (delete_after_send) {
 957                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 958         }
 959
 960 }
 961
 962
 963 int read_spoolcontrol_file(SpoolControl **scc, char *filename)
 964 {
 965         FILE *fp;
 966         char instr[SIZ];
 967         char buf[SIZ];
 968         char nodename[256];
 969         char roomname[ROOMNAMELEN];
 970         size_t miscsize = 0;
 971         size_t linesize = 0;
 972         int skipthisline = 0;
 973         namelist *nptr = NULL;
 974         maplist *mptr = NULL;
 975         SpoolControl *sc;
 976
 977         fp = fopen(filename, "r");
 978         if (fp == NULL) {
 979                 return 0;
 980         }
 981         sc = malloc(sizeof(SpoolControl));
 982         memset(sc, 0, sizeof(SpoolControl));
 983         *scc = sc;
 984
 985         while (fgets(buf, sizeof buf, fp) != NULL) {
 986                 buf[strlen(buf)-1] = 0;
 987
 988                 extract_token(instr, buf, 0, '|', sizeof instr);
 989                 if (!strcasecmp(instr, strof(lastsent))) {
 990                         sc->lastsent = extract_long(buf, 1);
 991                 }
 992                 else if (!strcasecmp(instr, strof(listrecp))) {
 993                         nptr = (namelist *)
 994                                 malloc(sizeof(namelist));
 995                         nptr->next = sc->listrecps;
 996                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 997                         sc->listrecps = nptr;
 998                 }
 999                 else if (!strcasecmp(instr, strof(participate))) {
1000                         nptr = (namelist *)
1001                                 malloc(sizeof(namelist));
1002                         nptr->next = sc->participates;
1003                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
1004                         sc->participates = nptr;
1005                 }
1006                 else if (!strcasecmp(instr, strof(digestrecp))) {
1007                         nptr = (namelist *)
1008                                 malloc(sizeof(namelist));
1009                         nptr->next = sc->digestrecps;
1010                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
1011                         sc->digestrecps = nptr;
1012                 }
1013                 else if (!strcasecmp(instr, strof(ignet_push_share))) {
1014                         extract_token(nodename, buf, 1, '|', sizeof nodename);
1015                         extract_token(roomname, buf, 2, '|', sizeof roomname);
1016                         mptr = (maplist *) malloc(sizeof(maplist));
1017                         mptr->next = sc->ignet_push_shares;
1018                         strcpy(mptr->remote_nodename, nodename);
1019                         strcpy(mptr->remote_roomname, roomname);
1020                         sc->ignet_push_shares = mptr;
1021                 }
1022                 else {
1023                         /* Preserve 'other' lines ... *unless* they happen to
1024                          * be subscribe/unsubscribe pendings with expired
1025                          * timestamps.
1026                          */
1027                         skipthisline = 0;
1028                         if (!strncasecmp(buf, strof(subpending)"|", 11)) {
1029                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
1030                                         skipthisline = 1;
1031                                 }
1032                         }
1033                         if (!strncasecmp(buf, strof(unsubpending)"|", 13)) {
1034                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
1035                                         skipthisline = 1;
1036                                 }
1037                         }
1038
1039                         if (skipthisline == 0) {
1040                                 linesize = strlen(buf);
1041                                 sc->misc = realloc(sc->misc,
1042                                         (miscsize + linesize + 2) );
1043                                 sprintf(&sc->misc[miscsize], "%s\n", buf);
1044                                 miscsize = miscsize + linesize + 1;
1045                         }
1046                 }
1047
1048
1049         }
1050         fclose(fp);
1051         return 1;
1052 }
1053
1054 void free_spoolcontrol_struct(SpoolControl **scc)
1055 {
1056         SpoolControl *sc;
1057         namelist *nptr = NULL;
1058         maplist *mptr = NULL;
1059
1060         sc = *scc;
1061         while (sc->listrecps != NULL) {
1062                 nptr = sc->listrecps->next;
1063                 free(sc->listrecps);
1064                 sc->listrecps = nptr;
1065         }
1066         /* Do the same for digestrecps */
1067         while (sc->digestrecps != NULL) {
1068                 nptr = sc->digestrecps->next;
1069                 free(sc->digestrecps);
1070                 sc->digestrecps = nptr;
1071         }
1072         /* Do the same for participates */
1073         while (sc->participates != NULL) {
1074                 nptr = sc->participates->next;
1075                 free(sc->participates);
1076                 sc->participates = nptr;
1077         }
1078         while (sc->ignet_push_shares != NULL) {
1079                 mptr = sc->ignet_push_shares->next;
1080                 free(sc->ignet_push_shares);
1081                 sc->ignet_push_shares = mptr;
1082         }
1083         free(sc->misc);
1084         free(sc);
1085         *scc=NULL;
1086 }
1087
1088 int writenfree_spoolcontrol_file(SpoolControl **scc, char *filename)
1089 {
1090         char tempfilename[PATH_MAX];
1091         int TmpFD;
1092         SpoolControl *sc;
1093         namelist *nptr = NULL;
1094         maplist *mptr = NULL;
1095         long len;
1096         time_t unixtime;
1097         struct timeval tv;
1098         long reltid; /* if we don't have SYS_gettid, use "random" value */
1099         StrBuf *Cfg;
1100         int rc;
1101
1102         len = strlen(filename);
1103         memcpy(tempfilename, filename, len + 1);
1104
1105
1106 #if defined(HAVE_SYSCALL_H) && defined (SYS_gettid)
1107         reltid = syscall(SYS_gettid);
1108 #endif
1109         gettimeofday(&tv, NULL);
1110         /* Promote to time_t; types differ on some OSes (like darwin) */
1111         unixtime = tv.tv_sec;
1112
1113         sprintf(tempfilename + len, ".%ld-%ld", reltid, unixtime);
1114         sc = *scc;
1115         errno = 0;
1116         TmpFD = open(tempfilename, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
1117         Cfg = NewStrBuf();
1118         if ((TmpFD < 0) || (errno != 0)) {
1119                 CtdlLogPrintf(CTDL_CRIT, "ERROR: cannot open %s: %s\n",
1120                         filename, strerror(errno));
1121                 free_spoolcontrol_struct(scc);
1122                 unlink(tempfilename);
1123         }
1124         else {
1125                 StrBufAppendPrintf(Cfg, "lastsent|%ld\n", sc->lastsent);
1126
1127                 /* Write out the listrecps while freeing from memory at the
1128                  * same time.  Am I clever or what?  :)
1129                  */
1130                 while (sc->listrecps != NULL) {
1131                         StrBufAppendPrintf(Cfg, "listrecp|%s\n", sc->listrecps->name);
1132                         nptr = sc->listrecps->next;
1133                         free(sc->listrecps);
1134                         sc->listrecps = nptr;
1135                 }
1136                 /* Do the same for digestrecps */
1137                 while (sc->digestrecps != NULL) {
1138                         StrBufAppendPrintf(Cfg, "digestrecp|%s\n", sc->digestrecps->name);
1139                         nptr = sc->digestrecps->next;
1140                         free(sc->digestrecps);
1141                         sc->digestrecps = nptr;
1142                 }
1143                 /* Do the same for participates */
1144                 while (sc->participates != NULL) {
1145                         StrBufAppendPrintf(Cfg, "participate|%s\n", sc->participates->name);
1146                         nptr = sc->participates->next;
1147                         free(sc->participates);
1148                         sc->participates = nptr;
1149                 }
1150                 while (sc->ignet_push_shares != NULL) {
1151                         StrBufAppendPrintf(Cfg, "ignet_push_share|%s", sc->ignet_push_shares->remote_nodename);
1152                         if (!IsEmptyStr(sc->ignet_push_shares->remote_roomname)) {
1153                                 StrBufAppendPrintf(Cfg, "|%s", sc->ignet_push_shares->remote_roomname);
1154                         }
1155                         StrBufAppendPrintf(Cfg, "\n");
1156                         mptr = sc->ignet_push_shares->next;
1157                         free(sc->ignet_push_shares);
1158                         sc->ignet_push_shares = mptr;
1159                 }
1160                 if (sc->misc != NULL) {
1161                         StrBufAppendBufPlain(Cfg, sc->misc, -1, 0);
1162                 }
1163                 free(sc->misc);
1164
1165                 rc = write(TmpFD, ChrPtr(Cfg), StrLength(Cfg));
1166                 if ((rc >=0 ) && (rc == StrLength(Cfg)))
1167                 {
1168                         close(TmpFD);
1169                         rename(tempfilename, filename);
1170                 }
1171                 else {
1172                         CtdlLogPrintf(CTDL_EMERG,
1173                                       "unable to write %s; [%s]; not enough space on the disk?\n",
1174                                       tempfilename,
1175                                       strerror(errno));
1176                         close(TmpFD);
1177                         unlink(tempfilename);
1178                 }
1179                 FreeStrBuf(&Cfg);
1180                 free(sc);
1181                 *scc=NULL;
1182         }
1183         return 1;
1184 }
1185 int is_recipient(SpoolControl *sc, const char *Name)
1186 {
1187         namelist *nptr;
1188         size_t len;
1189
1190         len = strlen(Name);
1191         nptr = sc->listrecps;
1192         while (nptr != NULL) {
1193                 if (strncmp(Name, nptr->name, len)==0)
1194                         return 1;
1195                 nptr = nptr->next;
1196         }
1197         /* Do the same for digestrecps */
1198         nptr = sc->digestrecps;
1199         while (nptr != NULL) {
1200                 if (strncmp(Name, nptr->name, len)==0)
1201                         return 1;
1202                 nptr = nptr->next;
1203         }
1204         /* Do the same for participates */
1205         nptr = sc->participates;
1206         while (nptr != NULL) {
1207                 if (strncmp(Name, nptr->name, len)==0)
1208                         return 1;
1209                 nptr = nptr->next;
1210         }
1211         return 0;
1212 }
1213
1214
1215 /*
1216  * Batch up and send all outbound traffic from the current room
1217  */
1218 void network_spoolout_room(char *room_to_spool) {
1219         char buf[SIZ];
1220         char filename[PATH_MAX];
1221         SpoolControl *sc;
1222         int i;
1223
1224         /*
1225          * If the room doesn't exist, don't try to perform its networking tasks.
1226          * Normally this should never happen, but once in a while maybe a room gets
1227          * queued for networking and then deleted before it can happen.
1228          */
1229         if (CtdlGetRoom(&CC->room, room_to_spool) != 0) {
1230                 CtdlLogPrintf(CTDL_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
1231                 return;
1232         }
1233
1234         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1235         begin_critical_section(S_NETCONFIGS);
1236
1237         /* Only do net processing for rooms that have netconfigs */
1238         if (!read_spoolcontrol_file(&sc, filename))
1239         {
1240                 end_critical_section(S_NETCONFIGS);
1241                 return;
1242         }
1243         CtdlLogPrintf(CTDL_INFO, "Networking started for <%s>\n", CC->room.QRname);
1244
1245         /* If there are digest recipients, we have to build a digest */
1246         if (sc->digestrecps != NULL) {
1247                 sc->digestfp = tmpfile();
1248                 fprintf(sc->digestfp, "Content-type: text/plain\n\n");
1249         }
1250
1251         /* Do something useful */
1252         CtdlForEachMessage(MSGS_GT, sc->lastsent, NULL, NULL, NULL,
1253                 network_spool_msg, sc);
1254
1255         /* If we wrote a digest, deliver it and then close it */
1256         snprintf(buf, sizeof buf, "room_%s@%s",
1257                 CC->room.QRname, config.c_fqdn);
1258         for (i=0; buf[i]; ++i) {
1259                 buf[i] = tolower(buf[i]);
1260                 if (isspace(buf[i])) buf[i] = '_';
1261         }
1262         if (sc->digestfp != NULL) {
1263                 fprintf(sc->digestfp,   " -----------------------------------"
1264                                         "------------------------------------"
1265                                         "-------\n"
1266                                         "You are subscribed to the '%s' "
1267                                         "list.\n"
1268                                         "To post to the list: %s\n",
1269                                         CC->room.QRname, buf
1270                 );
1271                 network_deliver_digest(sc);     /* deliver and close */
1272         }
1273
1274         /* Now rewrite the config file */
1275         writenfree_spoolcontrol_file (&sc, filename);
1276         end_critical_section(S_NETCONFIGS);
1277 }
1278
1279
1280
1281 /*
1282  * Send the *entire* contents of the current room to one specific network node,
1283  * ignoring anything we know about which messages have already undergone
1284  * network processing.  This can be used to bring a new node into sync.
1285  */
1286 int network_sync_to(char *target_node) {
1287         SpoolControl sc;
1288         int num_spooled = 0;
1289         int found_node = 0;
1290         char buf[256];
1291         char sc_type[256];
1292         char sc_node[256];
1293         char sc_room[256];
1294         char filename[PATH_MAX];
1295         FILE *fp;
1296
1297         /* Grab the configuration line we're looking for */
1298         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1299         begin_critical_section(S_NETCONFIGS);
1300         fp = fopen(filename, "r");
1301         if (fp == NULL) {
1302                 end_critical_section(S_NETCONFIGS);
1303                 return(-1);
1304         }
1305         while (fgets(buf, sizeof buf, fp) != NULL) {
1306                 buf[strlen(buf)-1] = 0;
1307                 extract_token(sc_type, buf, 0, '|', sizeof sc_type);
1308                 extract_token(sc_node, buf, 1, '|', sizeof sc_node);
1309                 extract_token(sc_room, buf, 2, '|', sizeof sc_room);
1310                 if ( (!strcasecmp(sc_type, "ignet_push_share"))
1311                    && (!strcasecmp(sc_node, target_node)) ) {
1312                         found_node = 1;
1313
1314                         /* Concise syntax because we don't need a full linked-list */
1315                         memset(&sc, 0, sizeof(SpoolControl));
1316                         sc.ignet_push_shares = (maplist *)
1317                                 malloc(sizeof(maplist));
1318                         sc.ignet_push_shares->next = NULL;
1319                         safestrncpy(sc.ignet_push_shares->remote_nodename,
1320                                 sc_node,
1321                                 sizeof sc.ignet_push_shares->remote_nodename);
1322                         safestrncpy(sc.ignet_push_shares->remote_roomname,
1323                                 sc_room,
1324                                 sizeof sc.ignet_push_shares->remote_roomname);
1325                 }
1326         }
1327         fclose(fp);
1328         end_critical_section(S_NETCONFIGS);
1329
1330         if (!found_node) return(-1);
1331
1332         /* Send ALL messages */
1333         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL,
1334                 network_spool_msg, &sc);
1335
1336         /* Concise cleanup because we know there's only one node in the sc */
1337         free(sc.ignet_push_shares);
1338
1339         CtdlLogPrintf(CTDL_NOTICE, "Synchronized %d messages to <%s>\n",
1340                 num_spooled, target_node);
1341         return(num_spooled);
1342 }
1343
1344
1345 /*
1346  * Implements the NSYN command
1347  */
1348 void cmd_nsyn(char *argbuf) {
1349         int num_spooled;
1350         char target_node[256];
1351
1352         if (CtdlAccessCheck(ac_aide)) return;
1353
1354         extract_token(target_node, argbuf, 0, '|', sizeof target_node);
1355         num_spooled = network_sync_to(target_node);
1356         if (num_spooled >= 0) {
1357                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
1358         }
1359         else {
1360                 cprintf("%d No such room/node share exists.\n",
1361                         ERROR + ROOM_NOT_FOUND);
1362         }
1363 }
1364
1365
1366
1367 /*
1368  * Batch up and send all outbound traffic from the current room
1369  */
1370 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
1371         struct RoomProcList *ptr;
1372
1373         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
1374         if (ptr == NULL) return;
1375
1376         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
1377         begin_critical_section(S_RPLIST);
1378         ptr->next = rplist;
1379         rplist = ptr;
1380         end_critical_section(S_RPLIST);
1381 }
1382
1383 void destroy_network_queue_room(void)
1384 {
1385         struct RoomProcList *cur, *p;
1386         NetMap *nmcur, *nmp;
1387
1388         cur = rplist;
1389         begin_critical_section(S_RPLIST);
1390         while (cur != NULL)
1391         {
1392                 p = cur->next;
1393                 free (cur);
1394                 cur = p;
1395         }
1396         rplist = NULL;
1397         end_critical_section(S_RPLIST);
1398
1399         nmcur = the_netmap;
1400         while (nmcur != NULL)
1401         {
1402                 nmp = nmcur->next;
1403                 free (nmcur);
1404                 nmcur = nmp;
1405         }
1406         the_netmap = NULL;
1407         if (working_ignetcfg != NULL)
1408                 free (working_ignetcfg);
1409         working_ignetcfg = NULL;
1410 }
1411
1412
1413 /*
1414  * Learn topology from path fields
1415  */
1416 void network_learn_topology(char *node, char *path) {
1417         char nexthop[256];
1418         NetMap *nmptr;
1419
1420         strcpy(nexthop, "");
1421
1422         if (num_tokens(path, '!') < 3) return;
1423         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
1424                 if (!strcasecmp(nmptr->nodename, node)) {
1425                         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1426                         nmptr->lastcontact = time(NULL);
1427                         ++netmap_changed;
1428                         return;
1429                 }
1430         }
1431
1432         /* If we got here then it's not in the map, so add it. */
1433         nmptr = (NetMap *) malloc(sizeof (NetMap));
1434         strcpy(nmptr->nodename, node);
1435         nmptr->lastcontact = time(NULL);
1436         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1437         nmptr->next = the_netmap;
1438         the_netmap = nmptr;
1439         ++netmap_changed;
1440 }
1441
1442
1443
1444
1445 /*
1446  * Bounce a message back to the sender
1447  */
1448 void network_bounce(struct CtdlMessage *msg, char *reason) {
1449         char *oldpath = NULL;
1450         char buf[SIZ];
1451         char bouncesource[SIZ];
1452         char recipient[SIZ];
1453         struct recptypes *valid = NULL;
1454         char force_room[ROOMNAMELEN];
1455         static int serialnum = 0;
1456         size_t size;
1457
1458         CtdlLogPrintf(CTDL_DEBUG, "entering network_bounce()\n");
1459
1460         if (msg == NULL) return;
1461
1462         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
1463
1464         /*
1465          * Give it a fresh message ID
1466          */
1467         if (msg->cm_fields['I'] != NULL) {
1468                 free(msg->cm_fields['I']);
1469         }
1470         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
1471                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
1472         msg->cm_fields['I'] = strdup(buf);
1473
1474         /*
1475          * FIXME ... right now we're just sending a bounce; we really want to
1476          * include the text of the bounced message.
1477          */
1478         if (msg->cm_fields['M'] != NULL) {
1479                 free(msg->cm_fields['M']);
1480         }
1481         msg->cm_fields['M'] = strdup(reason);
1482         msg->cm_format_type = 0;
1483
1484         /*
1485          * Turn the message around
1486          */
1487         if (msg->cm_fields['R'] == NULL) {
1488                 free(msg->cm_fields['R']);
1489         }
1490
1491         if (msg->cm_fields['D'] == NULL) {
1492                 free(msg->cm_fields['D']);
1493         }
1494
1495         snprintf(recipient, sizeof recipient, "%s@%s",
1496                 msg->cm_fields['A'], msg->cm_fields['N']);
1497
1498         if (msg->cm_fields['A'] == NULL) {
1499                 free(msg->cm_fields['A']);
1500         }
1501
1502         if (msg->cm_fields['N'] == NULL) {
1503                 free(msg->cm_fields['N']);
1504         }
1505
1506         if (msg->cm_fields['U'] == NULL) {
1507                 free(msg->cm_fields['U']);
1508         }
1509
1510         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1511         msg->cm_fields['N'] = strdup(config.c_nodename);
1512         msg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
1513
1514         /* prepend our node to the path */
1515         if (msg->cm_fields['P'] != NULL) {
1516                 oldpath = msg->cm_fields['P'];
1517                 msg->cm_fields['P'] = NULL;
1518         }
1519         else {
1520                 oldpath = strdup("unknown_user");
1521         }
1522         size = strlen(oldpath) + SIZ;
1523         msg->cm_fields['P'] = malloc(size);
1524         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1525         free(oldpath);
1526
1527         /* Now submit the message */
1528         valid = validate_recipients(recipient, NULL, 0);
1529         if (valid != NULL) if (valid->num_error != 0) {
1530                 free_recipients(valid);
1531                 valid = NULL;
1532         }
1533         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1534                 strcpy(force_room, config.c_aideroom);
1535         }
1536         else {
1537                 strcpy(force_room, "");
1538         }
1539         if ( (valid == NULL) && IsEmptyStr(force_room) ) {
1540                 strcpy(force_room, config.c_aideroom);
1541         }
1542         CtdlSubmitMsg(msg, valid, force_room, 0);
1543
1544         /* Clean up */
1545         if (valid != NULL) free_recipients(valid);
1546         CtdlFreeMessage(msg);
1547         CtdlLogPrintf(CTDL_DEBUG, "leaving network_bounce()\n");
1548 }
1549
1550
1551
1552
1553 /*
1554  * Process a buffer containing a single message from a single file
1555  * from the inbound queue
1556  */
1557 void network_process_buffer(char *buffer, long size) {
1558         struct CtdlMessage *msg = NULL;
1559         long pos;
1560         int field;
1561         struct recptypes *recp = NULL;
1562         char target_room[ROOMNAMELEN];
1563         struct ser_ret sermsg;
1564         char *oldpath = NULL;
1565         char filename[PATH_MAX];
1566         FILE *fp;
1567         char nexthop[SIZ];
1568         unsigned char firstbyte;
1569         unsigned char lastbyte;
1570
1571         CtdlLogPrintf(CTDL_DEBUG, "network_process_buffer() processing %ld bytes\n", size);
1572
1573         /* Validate just a little bit.  First byte should be FF and * last byte should be 00. */
1574         firstbyte = buffer[0];
1575         lastbyte = buffer[size-1];
1576         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1577                 CtdlLogPrintf(CTDL_ERR, "Corrupt message ignored.  Length=%ld, firstbyte = %d, lastbyte = %d\n",
1578                         size, firstbyte, lastbyte);
1579                 return;
1580         }
1581
1582         /* Set default target room to trash */
1583         strcpy(target_room, TWITROOM);
1584
1585         /* Load the message into memory */
1586         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1587         memset(msg, 0, sizeof(struct CtdlMessage));
1588         msg->cm_magic = CTDLMESSAGE_MAGIC;
1589         msg->cm_anon_type = buffer[1];
1590         msg->cm_format_type = buffer[2];
1591
1592         for (pos = 3; pos < size; ++pos) {
1593                 field = buffer[pos];
1594                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1595                 pos = pos + strlen(&buffer[(int)pos]);
1596         }
1597
1598         /* Check for message routing */
1599         if (msg->cm_fields['D'] != NULL) {
1600                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1601
1602                         /* route the message */
1603                         strcpy(nexthop, "");
1604                         if (is_valid_node(nexthop, NULL, msg->cm_fields['D']) == 0) {
1605                                 /* prepend our node to the path */
1606                                 if (msg->cm_fields['P'] != NULL) {
1607                                         oldpath = msg->cm_fields['P'];
1608                                         msg->cm_fields['P'] = NULL;
1609                                 }
1610                                 else {
1611                                         oldpath = strdup("unknown_user");
1612                                 }
1613                                 size = strlen(oldpath) + SIZ;
1614                                 msg->cm_fields['P'] = malloc(size);
1615                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1616                                         config.c_nodename, oldpath);
1617                                 free(oldpath);
1618
1619                                 /* serialize the message */
1620                                 serialize_message(&sermsg, msg);
1621
1622                                 /* now send it */
1623                                 if (IsEmptyStr(nexthop)) {
1624                                         strcpy(nexthop, msg->cm_fields['D']);
1625                                 }
1626                                 snprintf(filename,
1627                                         sizeof filename,
1628                                         "%s/%s@%lx%x",
1629                                         ctdl_netout_dir,
1630                                         nexthop,
1631                                         time(NULL),
1632                                         rand()
1633                                 );
1634                                 CtdlLogPrintf(CTDL_DEBUG, "Appending to %s\n", filename);
1635                                 fp = fopen(filename, "ab");
1636                                 if (fp != NULL) {
1637                                         fwrite(sermsg.ser, sermsg.len, 1, fp);
1638                                         fclose(fp);
1639                                 }
1640                                 else {
1641                                         CtdlLogPrintf(CTDL_ERR, "%s: %s\n", filename, strerror(errno));
1642                                 }
1643                                 free(sermsg.ser);
1644                                 CtdlFreeMessage(msg);
1645                                 return;
1646                         }
1647
1648                         else {  /* invalid destination node name */
1649
1650                                 network_bounce(msg,
1651 "A message you sent could not be delivered due to an invalid destination node"
1652 " name.  Please check the address and try sending the message again.\n");
1653                                 msg = NULL;
1654                                 return;
1655
1656                         }
1657                 }
1658         }
1659
1660         /*
1661          * Check to see if we already have a copy of this message, and
1662          * abort its processing if so.  (We used to post a warning to Aide>
1663          * every time this happened, but the network is now so densely
1664          * connected that it's inevitable.)
1665          */
1666         if (network_usetable(msg) != 0) {
1667                 CtdlFreeMessage(msg);
1668                 return;
1669         }
1670
1671         /* Learn network topology from the path */
1672         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1673                 network_learn_topology(msg->cm_fields['N'], msg->cm_fields['P']);
1674         }
1675
1676         /* Is the sending node giving us a very persuasive suggestion about
1677          * which room this message should be saved in?  If so, go with that.
1678          */
1679         if (msg->cm_fields['C'] != NULL) {
1680                 safestrncpy(target_room, msg->cm_fields['C'], sizeof target_room);
1681         }
1682
1683         /* Otherwise, does it have a recipient?  If so, validate it... */
1684         else if (msg->cm_fields['R'] != NULL) {
1685                 recp = validate_recipients(msg->cm_fields['R'], NULL, 0);
1686                 if (recp != NULL) if (recp->num_error != 0) {
1687                         network_bounce(msg,
1688                                 "A message you sent could not be delivered due to an invalid address.\n"
1689                                 "Please check the address and try sending the message again.\n");
1690                         msg = NULL;
1691                         free_recipients(recp);
1692                         CtdlLogPrintf(CTDL_DEBUG, "Bouncing message due to invalid recipient address.\n");
1693                         return;
1694                 }
1695                 strcpy(target_room, "");        /* no target room if mail */
1696         }
1697
1698         /* Our last shot at finding a home for this message is to see if
1699          * it has the O field (Originating room) set.
1700          */
1701         else if (msg->cm_fields['O'] != NULL) {
1702                 safestrncpy(target_room, msg->cm_fields['O'], sizeof target_room);
1703         }
1704
1705         /* Strip out fields that are only relevant during transit */
1706         if (msg->cm_fields['D'] != NULL) {
1707                 free(msg->cm_fields['D']);
1708                 msg->cm_fields['D'] = NULL;
1709         }
1710         if (msg->cm_fields['C'] != NULL) {
1711                 free(msg->cm_fields['C']);
1712                 msg->cm_fields['C'] = NULL;
1713         }
1714
1715         /* save the message into a room */
1716         if (PerformNetprocHooks(msg, target_room) == 0) {
1717                 msg->cm_flags = CM_SKIP_HOOKS;
1718                 CtdlSubmitMsg(msg, recp, target_room, 0);
1719         }
1720         CtdlFreeMessage(msg);
1721         free_recipients(recp);
1722 }
1723
1724
1725 /*
1726  * Process a single message from a single file from the inbound queue
1727  */
1728 void network_process_message(FILE *fp, long msgstart, long msgend) {
1729         long hold_pos;
1730         long size;
1731         char *buffer;
1732
1733         hold_pos = ftell(fp);
1734         size = msgend - msgstart + 1;
1735         buffer = malloc(size);
1736         if (buffer != NULL) {
1737                 fseek(fp, msgstart, SEEK_SET);
1738                 if (fread(buffer, size, 1, fp) > 0) {
1739                         network_process_buffer(buffer, size);
1740                 }
1741                 free(buffer);
1742         }
1743
1744         fseek(fp, hold_pos, SEEK_SET);
1745 }
1746
1747
1748 /*
1749  * Process a single file from the inbound queue
1750  */
1751 void network_process_file(char *filename) {
1752         FILE *fp;
1753         long msgstart = (-1L);
1754         long msgend = (-1L);
1755         long msgcur = 0L;
1756         int ch;
1757
1758
1759         fp = fopen(filename, "rb");
1760         if (fp == NULL) {
1761                 CtdlLogPrintf(CTDL_CRIT, "Error opening %s: %s\n", filename, strerror(errno));
1762                 return;
1763         }
1764
1765         fseek(fp, 0L, SEEK_END);
1766         CtdlLogPrintf(CTDL_INFO, "network: processing %ld bytes from %s\n", ftell(fp), filename);
1767         rewind(fp);
1768
1769         /* Look for messages in the data stream and break them out */
1770         while (ch = getc(fp), ch >= 0) {
1771
1772                 if (ch == 255) {
1773                         if (msgstart >= 0L) {
1774                                 msgend = msgcur - 1;
1775                                 network_process_message(fp, msgstart, msgend);
1776                         }
1777                         msgstart = msgcur;
1778                 }
1779
1780                 ++msgcur;
1781         }
1782
1783         msgend = msgcur - 1;
1784         if (msgstart >= 0L) {
1785                 network_process_message(fp, msgstart, msgend);
1786         }
1787
1788         fclose(fp);
1789         unlink(filename);
1790 }
1791
1792
1793 /*
1794  * Process anything in the inbound queue
1795  */
1796 void network_do_spoolin(void) {
1797         DIR *dp;
1798         struct dirent *d;
1799         struct stat statbuf;
1800         char filename[PATH_MAX];
1801         static time_t last_spoolin_mtime = 0L;
1802
1803         /*
1804          * Check the spoolin directory's modification time.  If it hasn't
1805          * been touched, we don't need to scan it.
1806          */
1807         if (stat(ctdl_netin_dir, &statbuf)) return;
1808         if (statbuf.st_mtime == last_spoolin_mtime) {
1809                 CtdlLogPrintf(CTDL_DEBUG, "network: nothing in inbound queue\n");
1810                 return;
1811         }
1812         last_spoolin_mtime = statbuf.st_mtime;
1813         CtdlLogPrintf(CTDL_DEBUG, "network: processing inbound queue\n");
1814
1815         /*
1816          * Ok, there's something interesting in there, so scan it.
1817          */
1818         dp = opendir(ctdl_netin_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                         snprintf(filename,
1824                                 sizeof filename,
1825                                 "%s/%s",
1826                                 ctdl_netin_dir,
1827                                 d->d_name
1828                         );
1829                         network_process_file(filename);
1830                 }
1831         }
1832
1833         closedir(dp);
1834 }
1835
1836 /*
1837  * Step 1: consolidate files in the outbound queue into one file per neighbor node
1838  * Step 2: delete any files in the outbound queue that were for neighbors who no longer exist.
1839  */
1840 void network_consolidate_spoolout(void) {
1841         DIR *dp;
1842         struct dirent *d;
1843         char filename[PATH_MAX];
1844         char cmd[PATH_MAX];
1845         char nexthop[256];
1846         int i;
1847         char *ptr;
1848
1849         /* Step 1: consolidate files in the outbound queue into one file per neighbor node */
1850         dp = opendir(ctdl_netout_dir);
1851         if (dp == NULL) return;
1852         while (d = readdir(dp), d != NULL) {
1853                 if (
1854                         (strcmp(d->d_name, "."))
1855                         && (strcmp(d->d_name, ".."))
1856                         && (strchr(d->d_name, '@') != NULL)
1857                 ) {
1858                         safestrncpy(nexthop, d->d_name, sizeof nexthop);
1859                         ptr = strchr(nexthop, '@');
1860                         if (ptr) *ptr = 0;
1861
1862                         snprintf(filename,
1863                                 sizeof filename,
1864                                 "%s/%s",
1865                                 ctdl_netout_dir,
1866                                 d->d_name
1867                         );
1868
1869                         CtdlLogPrintf(CTDL_DEBUG, "Consolidate %s to %s\n", filename, nexthop);
1870                         if (network_talking_to(nexthop, NTT_CHECK)) {
1871                                 CtdlLogPrintf(CTDL_DEBUG,
1872                                         "Currently online with %s - skipping for now\n",
1873                                         nexthop
1874                                 );
1875                         }
1876                         else {
1877                                 network_talking_to(nexthop, NTT_ADD);
1878                                 snprintf(cmd, sizeof cmd, "/bin/cat %s >>%s/%s && /bin/rm -f %s",
1879                                         filename,
1880                                         ctdl_netout_dir, nexthop,
1881                                         filename
1882                                 );
1883                                 system(cmd);
1884                                 network_talking_to(nexthop, NTT_REMOVE);
1885                         }
1886                 }
1887         }
1888         closedir(dp);
1889
1890         /* Step 2: delete any files in the outbound queue that were for neighbors who no longer exist */
1891
1892         dp = opendir(ctdl_netout_dir);
1893         if (dp == NULL) return;
1894
1895         while (d = readdir(dp), d != NULL) {
1896                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
1897                         continue;
1898                 ptr = strchr(d->d_name, '@');
1899                 if (d != NULL)
1900                         continue;
1901                 snprintf(filename,
1902                         sizeof filename,
1903                         "%s/%s",
1904                         ctdl_netout_dir,
1905                         d->d_name
1906                 );
1907
1908                 strcpy(nexthop, "");
1909                 i = is_valid_node(nexthop, NULL, d->d_name);
1910
1911                 if ( (i != 0) || !IsEmptyStr(nexthop) ) {
1912                         unlink(filename);
1913                 }
1914         }
1915
1916
1917         closedir(dp);
1918 }
1919
1920
1921 /*
1922  * receive network spool from the remote system
1923  */
1924 void receive_spool(int *sock, char *remote_nodename) {
1925         long download_len = 0L;
1926         long bytes_received = 0L;
1927         char buf[SIZ];
1928         static char pbuf[IGNET_PACKET_SIZE];
1929         char tempfilename[PATH_MAX];
1930         char permfilename[PATH_MAX];
1931         long plen;
1932         FILE *fp;
1933
1934         snprintf(tempfilename,
1935                 sizeof tempfilename,
1936                 "%s/%s.%lx%x",
1937                 ctdl_nettmp_dir,
1938                 remote_nodename,
1939                 time(NULL),
1940                 rand()
1941         );
1942
1943         snprintf(permfilename,
1944                 sizeof permfilename,
1945                 "%s/%s.%lx%x",
1946                 ctdl_netin_dir,
1947                 remote_nodename,
1948                 time(NULL),
1949                 rand()
1950         );
1951
1952         if (sock_puts(sock, "NDOP") < 0) return;
1953         if (sock_getln(sock, buf, sizeof buf) < 0) return;
1954         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1955         if (buf[0] != '2') {
1956                 return;
1957         }
1958         download_len = extract_long(&buf[4], 0);
1959
1960         if (download_len>0) {
1961                 bytes_received = 0L;
1962                 fp = fopen(tempfilename, "w");
1963                 if (fp == NULL) {
1964                         CtdlLogPrintf(CTDL_CRIT, "cannot open download file locally: %s\n",
1965                                       strerror(errno));
1966                         return;
1967                 }
1968
1969                 CtdlLogPrintf(CTDL_DEBUG, "For this download we are expecting %d bytes\n", download_len);
1970                 while (bytes_received < download_len) {
1971                         /*
1972                          * If shutting down we can exit here and unlink the temp file.
1973                          * this shouldn't loose us any messages.
1974                          */
1975                         if (CtdlThreadCheckStop())
1976                         {
1977                                 fclose(fp);
1978                                 unlink(tempfilename);
1979                                 return;
1980                         }
1981                         snprintf(buf, sizeof buf, "READ %ld|%ld",
1982                                  bytes_received,
1983                                  ((download_len - bytes_received > IGNET_PACKET_SIZE)
1984                                   ? IGNET_PACKET_SIZE : (download_len - bytes_received)));
1985
1986                         if (sock_puts(sock, buf) < 0) {
1987                                 fclose(fp);
1988                                 unlink(tempfilename);
1989                                 return;
1990                         }
1991                         if (sock_getln(sock, buf, sizeof buf) < 0) {
1992                                 fclose(fp);
1993                                 unlink(tempfilename);
1994                                 return;
1995                         }
1996
1997                         if (buf[0] == '6') {
1998                                 plen = extract_long(&buf[4], 0);
1999                                 if (sock_read(sock, pbuf, plen, 1) < 0) {
2000                                         fclose(fp);
2001                                         unlink(tempfilename);
2002                                         return;
2003                                 }
2004                                 fwrite((char *) pbuf, plen, 1, fp);
2005                                 bytes_received = bytes_received + plen;
2006                         }
2007                 }
2008
2009                 fclose(fp);
2010         }
2011         /* Last chance for shutdown exit */
2012         if (CtdlThreadCheckStop())
2013         {
2014                 unlink(tempfilename);
2015                 return;
2016         }
2017
2018         if (sock_puts(sock, "CLOS") < 0) {
2019                 unlink(tempfilename);
2020                 return;
2021         }
2022
2023         /*
2024          * From here on we must complete or messages will get lost
2025          */
2026         if (sock_getln(sock, buf, sizeof buf) < 0) {
2027                 unlink(tempfilename);
2028                 return;
2029         }
2030         if (download_len > 0) {
2031                 CtdlLogPrintf(CTDL_NOTICE, "Received %ld octets from <%s>\n", download_len, remote_nodename);
2032         }
2033         CtdlLogPrintf(CTDL_DEBUG, "%s\n", buf);
2034
2035         /* Now move the temp file to its permanent location.
2036          */
2037         if (link(tempfilename, permfilename) != 0) {
2038                 CtdlLogPrintf(CTDL_ALERT, "Could not link %s to %s: %s\n",
2039                         tempfilename, permfilename, strerror(errno)
2040                 );
2041         }
2042         unlink(tempfilename);
2043 }
2044
2045
2046
2047 /*
2048  * transmit network spool to the remote system
2049  */
2050 void transmit_spool(int *sock, char *remote_nodename)
2051 {
2052         char buf[SIZ];
2053         char pbuf[4096];
2054         long plen;
2055         long bytes_to_write, thisblock, bytes_written;
2056         int fd;
2057         char sfname[128];
2058
2059         if (sock_puts(sock, "NUOP") < 0) return;
2060         if (sock_getln(sock, buf, sizeof buf) < 0) return;
2061         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
2062         if (buf[0] != '2') {
2063                 return;
2064         }
2065
2066         snprintf(sfname, sizeof sfname,
2067                 "%s/%s",
2068                 ctdl_netout_dir,
2069                 remote_nodename
2070         );
2071         fd = open(sfname, O_RDONLY);
2072         if (fd < 0) {
2073                 if (errno != ENOENT) {
2074                         CtdlLogPrintf(CTDL_CRIT, "cannot open %s: %s\n", sfname, strerror(errno));
2075                 }
2076                 return;
2077         }
2078         bytes_written = 0;
2079         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
2080                 bytes_to_write = plen;
2081                 while (bytes_to_write > 0L) {
2082                         /* Exit if shutting down */
2083                         if (CtdlThreadCheckStop())
2084                         {
2085                                 close(fd);
2086                                 return;
2087                         }
2088
2089                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
2090                         if (sock_puts(sock, buf) < 0) {
2091                                 close(fd);
2092                                 return;
2093                         }
2094                         if (sock_getln(sock, buf, sizeof buf) < 0) {
2095                                 close(fd);
2096                                 return;
2097                         }
2098                         thisblock = atol(&buf[4]);
2099                         if (buf[0] == '7') {
2100                                 if (sock_write(sock, pbuf, (int) thisblock) < 0) {
2101                                         close(fd);
2102                                         return;
2103                                 }
2104                                 bytes_to_write -= thisblock;
2105                                 bytes_written += thisblock;
2106                         } else {
2107                                 goto ABORTUPL;
2108                         }
2109                 }
2110         }
2111
2112 ABORTUPL:
2113         close(fd);
2114
2115         /* Last chance for shutdown exit */
2116         if(CtdlThreadCheckStop())
2117                 return;
2118
2119         if (sock_puts(sock, "UCLS 1") < 0) return;
2120
2121         /*
2122          * From here on we must complete or messages will get lost
2123          */
2124         if (sock_getln(sock, buf, sizeof buf) < 0) return;
2125         CtdlLogPrintf(CTDL_NOTICE, "Sent %ld octets to <%s>\n", bytes_written, remote_nodename);
2126         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
2127         if (buf[0] == '2') {
2128                 CtdlLogPrintf(CTDL_DEBUG, "Removing <%s>\n", sfname);
2129                 unlink(sfname);
2130         }
2131 }
2132
2133
2134
2135 /*
2136  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
2137  */
2138 void network_poll_node(char *node, char *secret, char *host, char *port) {
2139         int sock;
2140         char buf[SIZ];
2141         char err_buf[SIZ];
2142         char connected_to[SIZ];
2143         CitContext *CCC=CC;
2144
2145         if (network_talking_to(node, NTT_CHECK)) return;
2146         network_talking_to(node, NTT_ADD);
2147         CtdlLogPrintf(CTDL_DEBUG, "network: polling <%s>\n", node);
2148         CtdlLogPrintf(CTDL_NOTICE, "Connecting to <%s> at %s:%s\n", node, host, port);
2149
2150         sock = sock_connect(host, port, "tcp");
2151         if (sock < 0) {
2152                 CtdlLogPrintf(CTDL_ERR, "Could not connect: %s\n", strerror(errno));
2153                 network_talking_to(node, NTT_REMOVE);
2154                 return;
2155         }
2156
2157         CtdlLogPrintf(CTDL_DEBUG, "Connected!\n");
2158         CCC->sReadBuf = NewStrBuf();
2159         CCC->sMigrateBuf = NewStrBuf();
2160         CCC->sPos = NULL;
2161
2162         /* Read the server greeting */
2163         if (sock_getln(&sock, buf, sizeof buf) < 0) goto bail;
2164         CtdlLogPrintf(CTDL_DEBUG, ">%s\n", buf);
2165
2166         /* Check that the remote is who we think it is and warn the Aide if not */
2167         extract_token (connected_to, buf, 1, ' ', sizeof connected_to);
2168         if (strcmp(connected_to, node))
2169         {
2170                 snprintf(err_buf, sizeof(err_buf),
2171                         "Connected to node \"%s\" but I was expecting to connect to node \"%s\".",
2172                         connected_to, node
2173                 );
2174                 CtdlLogPrintf(CTDL_ERR, "%s\n", err_buf);
2175                 CtdlAideMessage(err_buf, "Network error");
2176         }
2177         else {
2178                 /* We're talking to the correct node.  Now identify ourselves. */
2179                 snprintf(buf, sizeof buf, "NETP %s|%s", config.c_nodename, secret);
2180                 CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
2181                 if (sock_puts(&sock, buf) <0) goto bail;
2182                 if (sock_getln(&sock, buf, sizeof buf) < 0) goto bail;
2183                 CtdlLogPrintf(CTDL_DEBUG, ">%s\n", buf);
2184                 if (buf[0] != '2') {
2185                         goto bail;
2186                 }
2187
2188                 /* At this point we are authenticated. */
2189                 if (!CtdlThreadCheckStop())
2190                         receive_spool(&sock, node);
2191                 if (!CtdlThreadCheckStop())
2192                         transmit_spool(&sock, node);
2193         }
2194
2195         sock_puts(&sock, "QUIT");
2196 bail:
2197         FreeStrBuf(&CCC->sReadBuf);
2198         FreeStrBuf(&CCC->sMigrateBuf);
2199         if (sock != -1)
2200                 sock_close(sock);
2201         network_talking_to(node, NTT_REMOVE);
2202 }
2203
2204
2205
2206 /*
2207  * Poll other Citadel nodes and transfer inbound/outbound network data.
2208  * Set "full" to nonzero to force a poll of every node, or to zero to poll
2209  * only nodes to which we have data to send.
2210  */
2211 void network_poll_other_citadel_nodes(int full_poll) {
2212         int i;
2213         char linebuf[256];
2214         char node[SIZ];
2215         char host[256];
2216         char port[256];
2217         char secret[256];
2218         int poll = 0;
2219         char spoolfile[256];
2220
2221         if (working_ignetcfg == NULL) {
2222                 CtdlLogPrintf(CTDL_DEBUG, "network: no neighbor nodes are configured - not polling.\n");
2223                 return;
2224         }
2225
2226         /* Use the string tokenizer to grab one line at a time */
2227         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
2228                 if(CtdlThreadCheckStop())
2229                         return;
2230                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
2231                 extract_token(node, linebuf, 0, '|', sizeof node);
2232                 extract_token(secret, linebuf, 1, '|', sizeof secret);
2233                 extract_token(host, linebuf, 2, '|', sizeof host);
2234                 extract_token(port, linebuf, 3, '|', sizeof port);
2235                 if ( !IsEmptyStr(node) && !IsEmptyStr(secret)
2236                    && !IsEmptyStr(host) && !IsEmptyStr(port)) {
2237                         poll = full_poll;
2238                         if (poll == 0) {
2239                                 snprintf(spoolfile,
2240                                          sizeof spoolfile,
2241                                          "%s/%s",
2242                                          ctdl_netout_dir,
2243                                          node
2244                                 );
2245                                 if (access(spoolfile, R_OK) == 0) {
2246                                         poll = 1;
2247                                 }
2248                         }
2249                         if (poll) {
2250                                 network_poll_node(node, secret, host, port);
2251                         }
2252                 }
2253         }
2254
2255 }
2256
2257
2258
2259
2260 /*
2261  * It's ok if these directories already exist.  Just fail silently.
2262  */
2263 void create_spool_dirs(void) {
2264         if ((mkdir(ctdl_spool_dir, 0700) != 0) && (errno != EEXIST))
2265                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_spool_dir, strerror(errno));
2266         if (chown(ctdl_spool_dir, CTDLUID, (-1)) != 0)
2267                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_spool_dir, strerror(errno));
2268         if ((mkdir(ctdl_netin_dir, 0700) != 0) && (errno != EEXIST))
2269                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_netin_dir, strerror(errno));
2270         if (chown(ctdl_netin_dir, CTDLUID, (-1)) != 0)
2271                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netin_dir, strerror(errno));
2272         if ((mkdir(ctdl_nettmp_dir, 0700) != 0) && (errno != EEXIST))
2273                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_nettmp_dir, strerror(errno));
2274         if (chown(ctdl_nettmp_dir, CTDLUID, (-1)) != 0)
2275                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_nettmp_dir, strerror(errno));
2276         if ((mkdir(ctdl_netout_dir, 0700) != 0) && (errno != EEXIST))
2277                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_netout_dir, strerror(errno));
2278         if (chown(ctdl_netout_dir, CTDLUID, (-1)) != 0)
2279                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netout_dir, strerror(errno));
2280 }
2281
2282
2283
2284
2285
2286 /*
2287  * network_do_queue()
2288  *
2289  * Run through the rooms doing various types of network stuff.
2290  */
2291 void *network_do_queue(void *args) {
2292         static time_t last_run = 0L;
2293         struct RoomProcList *ptr;
2294         int full_processing = 1;
2295         struct CitContext networkerCC;
2296
2297         /* Give the networker its own private CitContext */
2298         CtdlFillSystemContext(&networkerCC, "network");
2299         citthread_setspecific(MyConKey, (void *)&networkerCC );
2300
2301         /*
2302          * Run the full set of processing tasks no more frequently
2303          * than once every n seconds
2304          */
2305         if ( (time(NULL) - last_run) < config.c_net_freq ) {
2306                 full_processing = 0;
2307                 CtdlLogPrintf(CTDL_DEBUG, "Network full processing in %ld seconds.\n",
2308                         config.c_net_freq - (time(NULL)- last_run)
2309                 );
2310         }
2311
2312         /*
2313          * This is a simple concurrency check to make sure only one queue run
2314          * is done at a time.  We could do this with a mutex, but since we
2315          * don't really require extremely fine granularity here, we'll do it
2316          * with a static variable instead.
2317          */
2318         if (doing_queue) {
2319                 CtdlClearSystemContext();
2320                 return NULL;
2321         }
2322         doing_queue = 1;
2323
2324         /* Load the IGnet Configuration into memory */
2325         load_working_ignetcfg();
2326
2327         /*
2328          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
2329          * then we poll everyone.  Otherwise we only poll nodes we have stuff
2330          * to send to.
2331          */
2332         network_poll_other_citadel_nodes(full_processing);
2333
2334         /*
2335          * Load the network map and filter list into memory.
2336          */
2337         read_network_map();
2338         filterlist = load_filter_list();
2339
2340         /*
2341          * Go ahead and run the queue
2342          */
2343         if (full_processing && !CtdlThreadCheckStop()) {
2344                 CtdlLogPrintf(CTDL_DEBUG, "network: loading outbound queue\n");
2345                 CtdlForEachRoom(network_queue_room, NULL);
2346         }
2347
2348         if (rplist != NULL) {
2349                 CtdlLogPrintf(CTDL_DEBUG, "network: running outbound queue\n");
2350                 while (rplist != NULL && !CtdlThreadCheckStop()) {
2351                         char spoolroomname[ROOMNAMELEN];
2352                         safestrncpy(spoolroomname, rplist->name, sizeof spoolroomname);
2353                         begin_critical_section(S_RPLIST);
2354
2355                         /* pop this record off the list */
2356                         ptr = rplist;
2357                         rplist = rplist->next;
2358                         free(ptr);
2359
2360                         /* invalidate any duplicate entries to prevent double processing */
2361                         for (ptr=rplist; ptr!=NULL; ptr=ptr->next) {
2362                                 if (!strcasecmp(ptr->name, spoolroomname)) {
2363                                         ptr->name[0] = 0;
2364                                 }
2365                         }
2366
2367                         end_critical_section(S_RPLIST);
2368                         if (spoolroomname[0] != 0) {
2369                                 network_spoolout_room(spoolroomname);
2370                         }
2371                 }
2372         }
2373
2374         /* If there is anything in the inbound queue, process it */
2375         if (!CtdlThreadCheckStop()) {
2376                 network_do_spoolin();
2377         }
2378
2379         /* Save the network map back to disk */
2380         write_network_map();
2381
2382         /* Free the filter list in memory */
2383         free_filter_list(filterlist);
2384         filterlist = NULL;
2385
2386         network_consolidate_spoolout();
2387
2388         CtdlLogPrintf(CTDL_DEBUG, "network: queue run completed\n");
2389
2390         if (full_processing) {
2391                 last_run = time(NULL);
2392         }
2393
2394         doing_queue = 0;
2395
2396         /* Reschedule this task to happen again periodically, unless the thread system indicates
2397          * that the server is shutting down.
2398          */
2399         if (!CtdlThreadCheckStop()) {
2400                 CtdlThreadSchedule("IGnet Network", CTDLTHREAD_BIGSTACK,
2401                         network_do_queue, NULL, time(NULL) + 60
2402                 );
2403         }
2404         else {
2405                 CtdlLogPrintf(CTDL_DEBUG, "network: Task STOPPED.\n");
2406         }
2407         CtdlClearSystemContext();
2408         return NULL;
2409 }
2410
2411
2412 /*
2413  * cmd_netp() - authenticate to the server as another Citadel node polling
2414  *            for network traffic
2415  */
2416 void cmd_netp(char *cmdbuf)
2417 {
2418         char node[256];
2419         char pass[256];
2420         int v;
2421
2422         char secret[256];
2423         char nexthop[256];
2424         char err_buf[SIZ];
2425
2426         /* Authenticate */
2427         extract_token(node, cmdbuf, 0, '|', sizeof node);
2428         extract_token(pass, cmdbuf, 1, '|', sizeof pass);
2429
2430         /* load the IGnet Configuration to check node validity */
2431         load_working_ignetcfg();
2432         v = is_valid_node(nexthop, secret, node);
2433
2434         if (v != 0) {
2435                 snprintf(err_buf, sizeof err_buf,
2436                         "An unknown Citadel server called \"%s\" attempted to connect from %s [%s].\n",
2437                         node, CC->cs_host, CC->cs_addr
2438                 );
2439                 CtdlLogPrintf(CTDL_WARNING, err_buf);
2440                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2441                 CtdlAideMessage(err_buf, "IGNet Networking.");
2442                 return;
2443         }
2444
2445         if (strcasecmp(pass, secret)) {
2446                 snprintf(err_buf, sizeof err_buf,
2447                         "A Citadel server at %s [%s] failed to authenticate as network node \"%s\".\n",
2448                         CC->cs_host, CC->cs_addr, node
2449                 );
2450                 CtdlLogPrintf(CTDL_WARNING, err_buf);
2451                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2452                 CtdlAideMessage(err_buf, "IGNet Networking.");
2453                 return;
2454         }
2455
2456         if (network_talking_to(node, NTT_CHECK)) {
2457                 CtdlLogPrintf(CTDL_WARNING, "Duplicate session for network node <%s>", node);
2458                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
2459                 return;
2460         }
2461
2462         safestrncpy(CC->net_node, node, sizeof CC->net_node);
2463         network_talking_to(node, NTT_ADD);
2464         CtdlLogPrintf(CTDL_NOTICE, "Network node <%s> logged in from %s [%s]\n",
2465                 CC->net_node, CC->cs_host, CC->cs_addr
2466         );
2467         cprintf("%d authenticated as network node '%s'\n", CIT_OK, CC->net_node);
2468 }
2469
2470
2471 int network_room_handler (struct ctdlroom *room)
2472 {
2473         network_queue_room(room, NULL);
2474         return 0;
2475 }
2476
2477
2478 /*
2479  * Module entry point
2480  */
2481 CTDL_MODULE_INIT(network)
2482 {
2483         if (!threading)
2484         {
2485                 create_spool_dirs();
2486                 CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
2487                 CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
2488                 CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
2489                 CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
2490                 CtdlRegisterRoomHook(network_room_handler);
2491                 CtdlRegisterCleanupHook(destroy_network_queue_room);
2492         }
2493         else
2494                 CtdlThreadSchedule("IGnet Network", CTDLTHREAD_BIGSTACK, network_do_queue, NULL, 0);
2495         /* return our Subversion id for the Log */
2496         return "$Id$";
2497 }