citadel/modules/network/serv_network.c

   1 /*
   2  * This module handles shared rooms, inter-Citadel mail, and outbound
   3  * mailing list processing.
   4  *
   5  * Copyright (c) 2000-2011 by the citadel.org team
   6  *
   7  *  This program is open source software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 3 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  22  * This is a fairly high-level type of critical section.  It ensures that no
  23  * two threads work on the netconfigs files at the same time.  Since we do
  24  * so many things inside these, here are the rules:
  25  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  26  *  2. Do *not* perform any I/O with the client during these sections.
  27  *
  28  */
  29
  30 /*
  31  * Duration of time (in seconds) after which pending list subscribe/unsubscribe
  32  * requests that have not been confirmed will be deleted.
  33  */
  34 #define EXP     259200  /* three days */
  35
  36 #include "sysdep.h"
  37 #include <stdlib.h>
  38 #include <unistd.h>
  39 #include <stdio.h>
  40 #include <fcntl.h>
  41 #include <ctype.h>
  42 #include <signal.h>
  43 #include <pwd.h>
  44 #include <errno.h>
  45 #include <sys/stat.h>
  46 #include <sys/types.h>
  47 #include <dirent.h>
  48 #if TIME_WITH_SYS_TIME
  49 # include <sys/time.h>
  50 # include <time.h>
  51 #else
  52 # if HAVE_SYS_TIME_H
  53 #  include <sys/time.h>
  54 # else
  55 #  include <time.h>
  56 # endif
  57 #endif
  58 #ifdef HAVE_SYSCALL_H
  59 # include <syscall.h>
  60 #else
  61 # if HAVE_SYS_SYSCALL_H
  62 #  include <sys/syscall.h>
  63 # endif
  64 #endif
  65
  66 #include <sys/wait.h>
  67 #include <string.h>
  68 #include <limits.h>
  69 #include <libcitadel.h>
  70 #include "citadel.h"
  71 #include "server.h"
  72 #include "citserver.h"
  73 #include "support.h"
  74 #include "config.h"
  75 #include "user_ops.h"
  76 #include "database.h"
  77 #include "msgbase.h"
  78 #include "internet_addressing.h"
  79 #include "serv_network.h"
  80 #include "clientsocket.h"
  81 #include "file_ops.h"
  82 #include "citadel_dirs.h"
  83 #include "threads.h"
  84
  85 #ifndef HAVE_SNPRINTF
  86 #include "snprintf.h"
  87 #endif
  88
  89 #include "context.h"
  90
  91 #include "ctdl_module.h"
  92
  93
  94
  95 /*
  96  * When we do network processing, it's accomplished in two passes; one to
  97  * gather a list of rooms and one to actually do them.  It's ok that rplist
  98  * is global; we have a mutex that keeps it safe.
  99  */
 100 struct RoomProcList *rplist = NULL;
 101
 102 /*
 103  * We build a map of network nodes during processing.
 104  */
 105 NetMap *the_netmap = NULL;
 106 int netmap_changed = 0;
 107 char *working_ignetcfg = NULL;
 108
 109 /*
 110  * Load or refresh the Citadel network (IGnet) configuration for this node.
 111  */
 112 void load_working_ignetcfg(void) {
 113         char *cfg;
 114         char *oldcfg;
 115
 116         cfg = CtdlGetSysConfig(IGNETCFG);
 117         if (cfg == NULL) {
 118                 cfg = strdup("");
 119         }
 120
 121         oldcfg = working_ignetcfg;
 122         working_ignetcfg = cfg;
 123         if (oldcfg != NULL) {
 124                 free(oldcfg);
 125         }
 126 }
 127
 128
 129
 130
 131
 132 /*
 133  * Keep track of what messages to reject
 134  */
 135 FilterList *load_filter_list(void) {
 136         char *serialized_list = NULL;
 137         int i;
 138         char buf[SIZ];
 139         FilterList *newlist = NULL;
 140         FilterList *nptr;
 141
 142         serialized_list = CtdlGetSysConfig(FILTERLIST);
 143         if (serialized_list == NULL) return(NULL); /* if null, no entries */
 144
 145         /* Use the string tokenizer to grab one line at a time */
 146         for (i=0; i<num_tokens(serialized_list, '\n'); ++i) {
 147                 extract_token(buf, serialized_list, i, '\n', sizeof buf);
 148                 nptr = (FilterList *) malloc(sizeof(FilterList));
 149                 extract_token(nptr->fl_user, buf, 0, '|', sizeof nptr->fl_user);
 150                 striplt(nptr->fl_user);
 151                 extract_token(nptr->fl_room, buf, 1, '|', sizeof nptr->fl_room);
 152                 striplt(nptr->fl_room);
 153                 extract_token(nptr->fl_node, buf, 2, '|', sizeof nptr->fl_node);
 154                 striplt(nptr->fl_node);
 155
 156                 /* Cowardly refuse to add an any/any/any entry that would
 157                  * end up filtering every single message.
 158                  */
 159                 if (IsEmptyStr(nptr->fl_user) &&
 160                     IsEmptyStr(nptr->fl_room) &&
 161                     IsEmptyStr(nptr->fl_node)) {
 162                         free(nptr);
 163                 }
 164                 else {
 165                         nptr->next = newlist;
 166                         newlist = nptr;
 167                 }
 168         }
 169
 170         free(serialized_list);
 171         return newlist;
 172 }
 173
 174
 175 void free_filter_list(FilterList *fl) {
 176         if (fl == NULL) return;
 177         free_filter_list(fl->next);
 178         free(fl);
 179 }
 180
 181
 182
 183 /*
 184  * Check the use table.  This is a list of messages which have recently
 185  * arrived on the system.  It is maintained and queried to prevent the same
 186  * message from being entered into the database multiple times if it happens
 187  * to arrive multiple times by accident.
 188  */
 189 int network_usetable(struct CtdlMessage *msg) {
 190
 191         char msgid[SIZ];
 192         struct cdbdata *cdbut;
 193         struct UseTable ut;
 194
 195         /* Bail out if we can't generate a message ID */
 196         if (msg == NULL) {
 197                 return(0);
 198         }
 199         if (msg->cm_fields['I'] == NULL) {
 200                 return(0);
 201         }
 202         if (IsEmptyStr(msg->cm_fields['I'])) {
 203                 return(0);
 204         }
 205
 206         /* Generate the message ID */
 207         strcpy(msgid, msg->cm_fields['I']);
 208         if (haschar(msgid, '@') == 0) {
 209                 strcat(msgid, "@");
 210                 if (msg->cm_fields['N'] != NULL) {
 211                         strcat(msgid, msg->cm_fields['N']);
 212                 }
 213                 else {
 214                         return(0);
 215                 }
 216         }
 217
 218         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 219         if (cdbut != NULL) {
 220                 cdb_free(cdbut);
 221                 syslog(LOG_DEBUG, "network_usetable() : we already have %s\n", msgid);
 222                 return(1);
 223         }
 224
 225         /* If we got to this point, it's unique: add it. */
 226         strcpy(ut.ut_msgid, msgid);
 227         ut.ut_timestamp = time(NULL);
 228         cdb_store(CDB_USETABLE, msgid, strlen(msgid), &ut, sizeof(struct UseTable) );
 229         return(0);
 230 }
 231
 232
 233 /*
 234  * Read the network map from its configuration file into memory.
 235  */
 236 void read_network_map(void) {
 237         char *serialized_map = NULL;
 238         int i;
 239         char buf[SIZ];
 240         NetMap *nmptr;
 241
 242         serialized_map = CtdlGetSysConfig(IGNETMAP);
 243         if (serialized_map == NULL) return;     /* if null, no entries */
 244
 245         /* Use the string tokenizer to grab one line at a time */
 246         for (i=0; i<num_tokens(serialized_map, '\n'); ++i) {
 247                 extract_token(buf, serialized_map, i, '\n', sizeof buf);
 248                 nmptr = (NetMap *) malloc(sizeof(NetMap));
 249                 extract_token(nmptr->nodename, buf, 0, '|', sizeof nmptr->nodename);
 250                 nmptr->lastcontact = extract_long(buf, 1);
 251                 extract_token(nmptr->nexthop, buf, 2, '|', sizeof nmptr->nexthop);
 252                 nmptr->next = the_netmap;
 253                 the_netmap = nmptr;
 254         }
 255
 256         free(serialized_map);
 257         netmap_changed = 0;
 258 }
 259
 260
 261 /*
 262  * Write the network map from memory back to the configuration file.
 263  */
 264 void write_network_map(void) {
 265         char *serialized_map = NULL;
 266         NetMap *nmptr;
 267
 268
 269         if (netmap_changed) {
 270                 serialized_map = strdup("");
 271
 272                 if (the_netmap != NULL) {
 273                         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 274                                 serialized_map = realloc(serialized_map,
 275                                                         (strlen(serialized_map)+SIZ) );
 276                                 if (!IsEmptyStr(nmptr->nodename)) {
 277                                         snprintf(&serialized_map[strlen(serialized_map)],
 278                                                 SIZ,
 279                                                 "%s|%ld|%s\n",
 280                                                 nmptr->nodename,
 281                                                 (long)nmptr->lastcontact,
 282                                                 nmptr->nexthop);
 283                                 }
 284                         }
 285                 }
 286
 287                 CtdlPutSysConfig(IGNETMAP, serialized_map);
 288                 free(serialized_map);
 289         }
 290
 291         /* Now free the list */
 292         while (the_netmap != NULL) {
 293                 nmptr = the_netmap->next;
 294                 free(the_netmap);
 295                 the_netmap = nmptr;
 296         }
 297         netmap_changed = 0;
 298 }
 299
 300
 301
 302 /*
 303  * Check the network map and determine whether the supplied node name is
 304  * valid.  If it is not a neighbor node, supply the name of a neighbor node
 305  * which is the next hop.  If it *is* a neighbor node, we also fill in the
 306  * shared secret.
 307  */
 308 int is_valid_node(char *nexthop, char *secret, char *node) {
 309         int i;
 310         char linebuf[SIZ];
 311         char buf[SIZ];
 312         int retval;
 313         NetMap *nmptr;
 314
 315         if (node == NULL) {
 316                 return(-1);
 317         }
 318
 319         /*
 320          * First try the neighbor nodes
 321          */
 322         if (working_ignetcfg == NULL) {
 323                 syslog(LOG_ERR, "working_ignetcfg is NULL!\n");
 324                 if (nexthop != NULL) {
 325                         strcpy(nexthop, "");
 326                 }
 327                 return(-1);
 328         }
 329
 330         retval = (-1);
 331         if (nexthop != NULL) {
 332                 strcpy(nexthop, "");
 333         }
 334
 335         /* Use the string tokenizer to grab one line at a time */
 336         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
 337                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
 338                 extract_token(buf, linebuf, 0, '|', sizeof buf);
 339                 if (!strcasecmp(buf, node)) {
 340                         if (nexthop != NULL) {
 341                                 strcpy(nexthop, "");
 342                         }
 343                         if (secret != NULL) {
 344                                 extract_token(secret, linebuf, 1, '|', 256);
 345                         }
 346                         retval = 0;
 347                 }
 348         }
 349
 350         if (retval == 0) {
 351                 return(retval);         /* yup, it's a direct neighbor */
 352         }
 353
 354         /*
 355          * If we get to this point we have to see if we know the next hop
 356          */
 357         if (the_netmap != NULL) {
 358                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 359                         if (!strcasecmp(nmptr->nodename, node)) {
 360                                 if (nexthop != NULL) {
 361                                         strcpy(nexthop, nmptr->nexthop);
 362                                 }
 363                                 return(0);
 364                         }
 365                 }
 366         }
 367
 368         /*
 369          * If we get to this point, the supplied node name is bogus.
 370          */
 371         syslog(LOG_ERR, "Invalid node name <%s>\n", node);
 372         return(-1);
 373 }
 374
 375
 376
 377
 378
 379 void cmd_gnet(char *argbuf) {
 380         char filename[PATH_MAX];
 381         char buf[SIZ];
 382         FILE *fp;
 383
 384         if ( (CC->room.QRflags & QR_MAILBOX) && (CC->user.usernum == atol(CC->room.QRname)) ) {
 385                 /* users can edit the netconfigs for their own mailbox rooms */
 386         }
 387         else if (CtdlAccessCheck(ac_room_aide)) return;
 388
 389         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 390         cprintf("%d Network settings for room #%ld <%s>\n",
 391                 LISTING_FOLLOWS,
 392                 CC->room.QRnumber, CC->room.QRname);
 393
 394         fp = fopen(filename, "r");
 395         if (fp != NULL) {
 396                 while (fgets(buf, sizeof buf, fp) != NULL) {
 397                         buf[strlen(buf)-1] = 0;
 398                         cprintf("%s\n", buf);
 399                 }
 400                 fclose(fp);
 401         }
 402
 403         cprintf("000\n");
 404 }
 405
 406
 407 void cmd_snet(char *argbuf) {
 408         char tempfilename[PATH_MAX];
 409         char filename[PATH_MAX];
 410         int TmpFD;
 411         StrBuf *Line;
 412         struct stat StatBuf;
 413         long len;
 414         int rc;
 415
 416         unbuffer_output();
 417
 418         if ( (CC->room.QRflags & QR_MAILBOX) && (CC->user.usernum == atol(CC->room.QRname)) ) {
 419                 /* users can edit the netconfigs for their own mailbox rooms */
 420         }
 421         else if (CtdlAccessCheck(ac_room_aide)) return;
 422
 423         len = assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 424         memcpy(tempfilename, filename, len + 1);
 425
 426         memset(&StatBuf, 0, sizeof(struct stat));
 427         if ((stat(filename, &StatBuf)  == -1) || (StatBuf.st_size == 0))
 428                 StatBuf.st_size = 80; /* Not there or empty? guess 80 chars line. */
 429
 430         sprintf(tempfilename + len, ".%d", CC->cs_pid);
 431         errno = 0;
 432         TmpFD = open(tempfilename, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
 433
 434         if ((TmpFD > 0) && (errno == 0))
 435         {
 436                 char *tmp = malloc(StatBuf.st_size * 2);
 437                 memset(tmp, ' ', StatBuf.st_size * 2);
 438                 rc = write(TmpFD, tmp, StatBuf.st_size * 2);
 439                 free(tmp);
 440                 if ((rc <= 0) || (rc != StatBuf.st_size * 2))
 441                 {
 442                         close(TmpFD);
 443                         cprintf("%d Unable to allocate the space required for %s: %s\n",
 444                                 ERROR + INTERNAL_ERROR,
 445                                 tempfilename,
 446                                 strerror(errno));
 447                         unlink(tempfilename);
 448                         return;
 449                 }
 450                 lseek(TmpFD, SEEK_SET, 0);
 451         }
 452         else {
 453                 cprintf("%d Unable to allocate the space required for %s: %s\n",
 454                         ERROR + INTERNAL_ERROR,
 455                         tempfilename,
 456                         strerror(errno));
 457                 unlink(tempfilename);
 458                 return;
 459         }
 460         Line = NewStrBuf();
 461
 462         cprintf("%d %s\n", SEND_LISTING, tempfilename);
 463
 464         len = 0;
 465         while (rc = CtdlClientGetLine(Line),
 466                (rc >= 0))
 467         {
 468                 if ((rc == 3) && (strcmp(ChrPtr(Line), "000") == 0))
 469                         break;
 470                 StrBufAppendBufPlain(Line, HKEY("\n"), 0);
 471                 write(TmpFD, ChrPtr(Line), StrLength(Line));
 472                 len += StrLength(Line);
 473         }
 474         FreeStrBuf(&Line);
 475         ftruncate(TmpFD, len);
 476         close(TmpFD);
 477
 478         /* Now copy the temp file to its permanent location.
 479          * (We copy instead of link because they may be on different filesystems)
 480          */
 481         begin_critical_section(S_NETCONFIGS);
 482         rename(tempfilename, filename);
 483         end_critical_section(S_NETCONFIGS);
 484 }
 485
 486
 487 /*
 488  * Deliver digest messages
 489  */
 490 void network_deliver_digest(SpoolControl *sc) {
 491         char buf[SIZ];
 492         int i;
 493         struct CtdlMessage *msg = NULL;
 494         long msglen;
 495         char *recps = NULL;
 496         size_t recps_len = SIZ;
 497         struct recptypes *valid;
 498         namelist *nptr;
 499         char bounce_to[256];
 500
 501         if (sc->num_msgs_spooled < 1) {
 502                 fclose(sc->digestfp);
 503                 sc->digestfp = NULL;
 504                 return;
 505         }
 506
 507         msg = malloc(sizeof(struct CtdlMessage));
 508         memset(msg, 0, sizeof(struct CtdlMessage));
 509         msg->cm_magic = CTDLMESSAGE_MAGIC;
 510         msg->cm_format_type = FMT_RFC822;
 511         msg->cm_anon_type = MES_NORMAL;
 512
 513         sprintf(buf, "%ld", time(NULL));
 514         msg->cm_fields['T'] = strdup(buf);
 515         msg->cm_fields['A'] = strdup(CC->room.QRname);
 516         snprintf(buf, sizeof buf, "[%s]", CC->room.QRname);
 517         msg->cm_fields['U'] = strdup(buf);
 518         sprintf(buf, "room_%s@%s", CC->room.QRname, config.c_fqdn);
 519         for (i=0; buf[i]; ++i) {
 520                 if (isspace(buf[i])) buf[i]='_';
 521                 buf[i] = tolower(buf[i]);
 522         }
 523         msg->cm_fields['F'] = strdup(buf);
 524         msg->cm_fields['R'] = strdup(buf);
 525
 526         /* Set the 'List-ID' header */
 527         msg->cm_fields['L'] = malloc(1024);
 528         snprintf(msg->cm_fields['L'], 1024,
 529                 "%s <%ld.list-id.%s>",
 530                 CC->room.QRname,
 531                 CC->room.QRnumber,
 532                 config.c_fqdn
 533         );
 534
 535         /*
 536          * Go fetch the contents of the digest
 537          */
 538         fseek(sc->digestfp, 0L, SEEK_END);
 539         msglen = ftell(sc->digestfp);
 540
 541         msg->cm_fields['M'] = malloc(msglen + 1);
 542         fseek(sc->digestfp, 0L, SEEK_SET);
 543         fread(msg->cm_fields['M'], (size_t)msglen, 1, sc->digestfp);
 544         msg->cm_fields['M'][msglen] = '\0';
 545
 546         fclose(sc->digestfp);
 547         sc->digestfp = NULL;
 548
 549         /* Now generate the delivery instructions */
 550
 551         /*
 552          * Figure out how big a buffer we need to allocate
 553          */
 554         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 555                 recps_len = recps_len + strlen(nptr->name) + 2;
 556         }
 557
 558         recps = malloc(recps_len);
 559
 560         if (recps == NULL) {
 561                 syslog(LOG_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 562                 abort();
 563         }
 564
 565         strcpy(recps, "");
 566
 567         /* Each recipient */
 568         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 569                 if (nptr != sc->digestrecps) {
 570                         strcat(recps, ",");
 571                 }
 572                 strcat(recps, nptr->name);
 573         }
 574
 575         /* Where do we want bounces and other noise to be heard?  Surely not the list members! */
 576         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 577
 578         /* Now submit the message */
 579         valid = validate_recipients(recps, NULL, 0);
 580         free(recps);
 581         if (valid != NULL) {
 582                 valid->bounce_to = strdup(bounce_to);
 583                 valid->envelope_from = strdup(bounce_to);
 584                 CtdlSubmitMsg(msg, valid, NULL, 0);
 585         }
 586         CtdlFreeMessage(msg);
 587         free_recipients(valid);
 588 }
 589
 590
 591 /*
 592  * Deliver list messages to everyone on the list ... efficiently
 593  */
 594 void network_deliver_list(struct CtdlMessage *msg, SpoolControl *sc) {
 595         char *recps = NULL;
 596         size_t recps_len = SIZ;
 597         struct recptypes *valid;
 598         namelist *nptr;
 599         char bounce_to[256];
 600
 601         /* Don't do this if there were no recipients! */
 602         if (sc->listrecps == NULL) return;
 603
 604         /* Now generate the delivery instructions */
 605
 606         /*
 607          * Figure out how big a buffer we need to allocate
 608          */
 609         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 610                 recps_len = recps_len + strlen(nptr->name) + 2;
 611         }
 612
 613         recps = malloc(recps_len);
 614
 615         if (recps == NULL) {
 616                 syslog(LOG_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 617                 abort();
 618         }
 619
 620         strcpy(recps, "");
 621
 622         /* Each recipient */
 623         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 624                 if (nptr != sc->listrecps) {
 625                         strcat(recps, ",");
 626                 }
 627                 strcat(recps, nptr->name);
 628         }
 629
 630         /* Where do we want bounces and other noise to be heard?  Surely not the list members! */
 631         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 632
 633         /* Now submit the message */
 634         valid = validate_recipients(recps, NULL, 0);
 635         free(recps);
 636         if (valid != NULL) {
 637                 valid->bounce_to = strdup(bounce_to);
 638                 valid->envelope_from = strdup(bounce_to);
 639                 CtdlSubmitMsg(msg, valid, NULL, 0);
 640                 free_recipients(valid);
 641         }
 642         /* Do not call CtdlFreeMessage(msg) here; the caller will free it. */
 643 }
 644
 645
 646
 647
 648 /*
 649  * Spools out one message from the list.
 650  */
 651 void network_spool_msg(long msgnum, void *userdata) {
 652         SpoolControl *sc;
 653         int i;
 654         char *newpath = NULL;
 655         struct CtdlMessage *msg = NULL;
 656         namelist *nptr;
 657         maplist *mptr;
 658         struct ser_ret sermsg;
 659         FILE *fp;
 660         char filename[PATH_MAX];
 661         char buf[SIZ];
 662         int bang = 0;
 663         int send = 1;
 664         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 665         int ok_to_participate = 0;
 666         struct recptypes *valid;
 667
 668         sc = (SpoolControl *)userdata;
 669
 670         /*
 671          * Process mailing list recipients
 672          */
 673         if (sc->listrecps != NULL) {
 674                 /* Fetch the message.  We're going to need to modify it
 675                  * in order to insert the [list name] in it, etc.
 676                  */
 677                 msg = CtdlFetchMessage(msgnum, 1);
 678                 if (msg != NULL) {
 679                         int rlen;
 680                         char *pCh;
 681                         StrBuf *Subject, *FlatSubject;
 682
 683                         if (msg->cm_fields['V'] == NULL){
 684                                 /* local message, no enVelope */
 685                                 StrBuf *Buf;
 686                                 Buf = NewStrBuf();
 687                                 StrBufAppendBufPlain(Buf, msg->cm_fields['O'], -1, 0);
 688                                 StrBufAppendBufPlain(Buf, HKEY("@"), 0);
 689                                 StrBufAppendBufPlain(Buf, config.c_fqdn, -1, 0);
 690
 691                                 msg->cm_fields['K'] = SmashStrBuf(&Buf);
 692                         }
 693                         else {
 694                                 msg->cm_fields['K'] = strdup (msg->cm_fields['V']);
 695                         }
 696                         /* Set the 'List-ID' header */
 697                         if (msg->cm_fields['L'] != NULL) {
 698                                 free(msg->cm_fields['L']);
 699                         }
 700                         msg->cm_fields['L'] = malloc(1024);
 701                         snprintf(msg->cm_fields['L'], 1024,
 702                                 "%s <%ld.list-id.%s>",
 703                                 CC->room.QRname,
 704                                 CC->room.QRnumber,
 705                                 config.c_fqdn
 706                         );
 707
 708                         /* Prepend "[List name]" to the subject */
 709                         if (msg->cm_fields['U'] == NULL) {
 710                                 Subject = NewStrBufPlain(HKEY("(no subject)"));
 711                         }
 712                         else {
 713                                 Subject = NewStrBufPlain(msg->cm_fields['U'], -1);
 714                         }
 715                         FlatSubject = NewStrBufPlain(NULL, StrLength(Subject));
 716                         StrBuf_RFC822_to_Utf8(FlatSubject, Subject, NULL, NULL);
 717
 718                         rlen = strlen(CC->room.QRname);
 719                         pCh  = strstr(ChrPtr(FlatSubject), CC->room.QRname);
 720                         if ((pCh == NULL) ||
 721                             (*(pCh + rlen) != ']') ||
 722                             (pCh == ChrPtr(FlatSubject)) ||
 723                             (*(pCh - 1) != '[')
 724                                 )
 725                         {
 726                                 StrBuf *tmp;
 727                                 StrBufPlain(Subject, HKEY("["));
 728                                 StrBufAppendBufPlain(Subject, CC->room.QRname, rlen, 0);
 729                                 StrBufAppendBufPlain(Subject, HKEY("] "), 0);
 730                                 StrBufAppendBuf(Subject, FlatSubject, 0);
 731                                 tmp = Subject;  Subject = FlatSubject;  FlatSubject = tmp; /* so we can free the right one... */
 732                                 StrBufRFC2047encode(&Subject, FlatSubject);
 733                         }
 734
 735                         if (msg->cm_fields['U'] != NULL)
 736                                 free (msg->cm_fields['U']);
 737                         msg->cm_fields['U'] = SmashStrBuf(&Subject);
 738
 739                         FreeStrBuf(&FlatSubject);
 740
 741                         /* else we won't modify the buffer, since the roomname is already here. */
 742
 743                         /* Set the recipient of the list message to the
 744                          * email address of the room itself.
 745                          * FIXME ... I want to be able to pick any address
 746                          */
 747                         if (msg->cm_fields['R'] != NULL) {
 748                                 free(msg->cm_fields['R']);
 749                         }
 750                         msg->cm_fields['R'] = malloc(256);
 751                         snprintf(msg->cm_fields['R'], 256,
 752                                 "room_%s@%s", CC->room.QRname,
 753                                 config.c_fqdn);
 754                         for (i=0; msg->cm_fields['R'][i]; ++i) {
 755                                 if (isspace(msg->cm_fields['R'][i])) {
 756                                         msg->cm_fields['R'][i] = '_';
 757                                 }
 758                         }
 759
 760                         /* Handle delivery */
 761                         network_deliver_list(msg, sc);
 762                         CtdlFreeMessage(msg);
 763                 }
 764         }
 765
 766         /*
 767          * Process digest recipients
 768          */
 769         if ((sc->digestrecps != NULL) && (sc->digestfp != NULL)) {
 770                 msg = CtdlFetchMessage(msgnum, 1);
 771                 if (msg != NULL) {
 772                         fprintf(sc->digestfp,   " -----------------------------------"
 773                                                 "------------------------------------"
 774                                                 "-------\n");
 775                         fprintf(sc->digestfp, "From: ");
 776                         if (msg->cm_fields['A'] != NULL) {
 777                                 fprintf(sc->digestfp, "%s ", msg->cm_fields['A']);
 778                         }
 779                         if (msg->cm_fields['F'] != NULL) {
 780                                 fprintf(sc->digestfp, "<%s> ", msg->cm_fields['F']);
 781                         }
 782                         else if (msg->cm_fields['N'] != NULL) {
 783                                 fprintf(sc->digestfp, "@%s ", msg->cm_fields['N']);
 784                         }
 785                         fprintf(sc->digestfp, "\n");
 786                         if (msg->cm_fields['U'] != NULL) {
 787                                 fprintf(sc->digestfp, "Subject: %s\n", msg->cm_fields['U']);
 788                         }
 789
 790                         CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 791
 792                         safestrncpy(CC->preferred_formats, "text/plain", sizeof CC->preferred_formats);
 793                         CtdlOutputPreLoadedMsg(msg, MT_CITADEL, HEADERS_NONE, 0, 0, 0);
 794
 795                         StrBufTrim(CC->redirect_buffer);
 796                         fwrite(HKEY("\n"), 1, sc->digestfp);
 797                         fwrite(SKEY(CC->redirect_buffer), 1, sc->digestfp);
 798                         fwrite(HKEY("\n"), 1, sc->digestfp);
 799
 800                         FreeStrBuf(&CC->redirect_buffer);
 801
 802                         sc->num_msgs_spooled += 1;
 803                         free(msg);
 804                 }
 805         }
 806
 807         /*
 808          * Process client-side list participations for this room
 809          */
 810         if (sc->participates != NULL) {
 811                 msg = CtdlFetchMessage(msgnum, 1);
 812                 if (msg != NULL) {
 813
 814                         /* Only send messages which originated on our own Citadel
 815                          * network, otherwise we'll end up sending the remote
 816                          * mailing list's messages back to it, which is rude...
 817                          */
 818                         ok_to_participate = 0;
 819                         if (msg->cm_fields['N'] != NULL) {
 820                                 if (!strcasecmp(msg->cm_fields['N'], config.c_nodename)) {
 821                                         ok_to_participate = 1;
 822                                 }
 823                                 if (is_valid_node(NULL, NULL, msg->cm_fields['N']) == 0) {
 824                                         ok_to_participate = 1;
 825                                 }
 826                         }
 827                         if (ok_to_participate) {
 828                                 if (msg->cm_fields['F'] != NULL) {
 829                                         free(msg->cm_fields['F']);
 830                                 }
 831                                 msg->cm_fields['F'] = malloc(SIZ);
 832                                 /* Replace the Internet email address of the actual
 833                                 * author with the email address of the room itself,
 834                                 * so the remote listserv doesn't reject us.
 835                                 * FIXME ... I want to be able to pick any address
 836                                 */
 837                                 snprintf(msg->cm_fields['F'], SIZ,
 838                                         "room_%s@%s", CC->room.QRname,
 839                                         config.c_fqdn);
 840                                 for (i=0; msg->cm_fields['F'][i]; ++i) {
 841                                         if (isspace(msg->cm_fields['F'][i])) {
 842                                                 msg->cm_fields['F'][i] = '_';
 843                                         }
 844                                 }
 845
 846                                 /*
 847                                  * Figure out how big a buffer we need to allocate
 848                                  */
 849                                 for (nptr = sc->participates; nptr != NULL; nptr = nptr->next) {
 850
 851                                         if (msg->cm_fields['R'] == NULL) {
 852                                                 free(msg->cm_fields['R']);
 853                                         }
 854                                         msg->cm_fields['R'] = strdup(nptr->name);
 855
 856                                         valid = validate_recipients(nptr->name, NULL, 0);
 857                                         CtdlSubmitMsg(msg, valid, "", 0);
 858                                         free_recipients(valid);
 859                                 }
 860
 861                         }
 862                         CtdlFreeMessage(msg);
 863                 }
 864         }
 865
 866         /*
 867          * Process IGnet push shares
 868          */
 869         msg = CtdlFetchMessage(msgnum, 1);
 870         if (msg != NULL) {
 871                 size_t newpath_len;
 872
 873                 /* Prepend our node name to the Path field whenever
 874                  * sending a message to another IGnet node
 875                  */
 876                 if (msg->cm_fields['P'] == NULL) {
 877                         msg->cm_fields['P'] = strdup("username");
 878                 }
 879                 newpath_len = strlen(msg->cm_fields['P']) +
 880                          strlen(config.c_nodename) + 2;
 881                 newpath = malloc(newpath_len);
 882                 snprintf(newpath, newpath_len, "%s!%s",
 883                          config.c_nodename, msg->cm_fields['P']);
 884                 free(msg->cm_fields['P']);
 885                 msg->cm_fields['P'] = newpath;
 886
 887                 /*
 888                  * Determine if this message is set to be deleted
 889                  * after sending out on the network
 890                  */
 891                 if (msg->cm_fields['S'] != NULL) {
 892                         if (!strcasecmp(msg->cm_fields['S'], "CANCEL")) {
 893                                 delete_after_send = 1;
 894                         }
 895                 }
 896
 897                 /* Now send it to every node */
 898                 if (sc->ignet_push_shares != NULL)
 899                   for (mptr = sc->ignet_push_shares; mptr != NULL;
 900                     mptr = mptr->next) {
 901
 902                         send = 1;
 903
 904                         /* Check for valid node name */
 905                         if (is_valid_node(NULL, NULL, mptr->remote_nodename) != 0) {
 906                                 syslog(LOG_ERR, "Invalid node <%s>\n", mptr->remote_nodename);
 907                                 send = 0;
 908                         }
 909
 910                         /* Check for split horizon */
 911                         syslog(LOG_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 912                         bang = num_tokens(msg->cm_fields['P'], '!');
 913                         if (bang > 1) for (i=0; i<(bang-1); ++i) {
 914                                 extract_token(buf, msg->cm_fields['P'], i, '!', sizeof buf);
 915                                 syslog(LOG_DEBUG, "Compare <%s> to <%s>\n",
 916                                         buf, mptr->remote_nodename) ;
 917                                 if (!strcasecmp(buf, mptr->remote_nodename)) {
 918                                         send = 0;
 919                                         syslog(LOG_DEBUG, "Not sending to %s\n",
 920                                                 mptr->remote_nodename);
 921                                 }
 922                                 else {
 923                                         syslog(LOG_DEBUG, "Sending to %s\n", mptr->remote_nodename);
 924                                 }
 925                         }
 926
 927                         /* Send the message */
 928                         if (send == 1) {
 929
 930                                 /*
 931                                  * Force the message to appear in the correct room
 932                                  * on the far end by setting the C field correctly
 933                                  */
 934                                 if (msg->cm_fields['C'] != NULL) {
 935                                         free(msg->cm_fields['C']);
 936                                 }
 937                                 if (!IsEmptyStr(mptr->remote_roomname)) {
 938                                         msg->cm_fields['C'] = strdup(mptr->remote_roomname);
 939                                 }
 940                                 else {
 941                                         msg->cm_fields['C'] = strdup(CC->room.QRname);
 942                                 }
 943
 944                                 /* serialize it for transmission */
 945                                 serialize_message(&sermsg, msg);
 946                                 if (sermsg.len > 0) {
 947
 948                                         /* write it to a spool file */
 949                                         snprintf(filename, sizeof filename,"%s/%s@%lx%x",
 950                                                 ctdl_netout_dir,
 951                                                 mptr->remote_nodename,
 952                                                 time(NULL),
 953                                                 rand()
 954                                         );
 955                                         syslog(LOG_DEBUG, "Appending to %s\n", filename);
 956                                         fp = fopen(filename, "ab");
 957                                         if (fp != NULL) {
 958                                                 fwrite(sermsg.ser,
 959                                                         sermsg.len, 1, fp);
 960                                                 fclose(fp);
 961                                         }
 962                                         else {
 963                                                 syslog(LOG_ERR, "%s: %s\n", filename, strerror(errno));
 964                                         }
 965
 966                                         /* free the serialized version */
 967                                         free(sermsg.ser);
 968                                 }
 969
 970                         }
 971                 }
 972                 CtdlFreeMessage(msg);
 973         }
 974
 975         /* update lastsent */
 976         sc->lastsent = msgnum;
 977
 978         /* Delete this message if delete-after-send is set */
 979         if (delete_after_send) {
 980                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 981         }
 982
 983 }
 984
 985
 986 int read_spoolcontrol_file(SpoolControl **scc, char *filename)
 987 {
 988         FILE *fp;
 989         char instr[SIZ];
 990         char buf[SIZ];
 991         char nodename[256];
 992         char roomname[ROOMNAMELEN];
 993         size_t miscsize = 0;
 994         size_t linesize = 0;
 995         int skipthisline = 0;
 996         namelist *nptr = NULL;
 997         maplist *mptr = NULL;
 998         SpoolControl *sc;
 999
1000         fp = fopen(filename, "r");
1001         if (fp == NULL) {
1002                 return 0;
1003         }
1004         sc = malloc(sizeof(SpoolControl));
1005         memset(sc, 0, sizeof(SpoolControl));
1006         *scc = sc;
1007
1008         while (fgets(buf, sizeof buf, fp) != NULL) {
1009                 buf[strlen(buf)-1] = 0;
1010
1011                 extract_token(instr, buf, 0, '|', sizeof instr);
1012                 if (!strcasecmp(instr, strof(lastsent))) {
1013                         sc->lastsent = extract_long(buf, 1);
1014                 }
1015                 else if (!strcasecmp(instr, strof(listrecp))) {
1016                         nptr = (namelist *)
1017                                 malloc(sizeof(namelist));
1018                         nptr->next = sc->listrecps;
1019                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
1020                         sc->listrecps = nptr;
1021                 }
1022                 else if (!strcasecmp(instr, strof(participate))) {
1023                         nptr = (namelist *)
1024                                 malloc(sizeof(namelist));
1025                         nptr->next = sc->participates;
1026                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
1027                         sc->participates = nptr;
1028                 }
1029                 else if (!strcasecmp(instr, strof(digestrecp))) {
1030                         nptr = (namelist *)
1031                                 malloc(sizeof(namelist));
1032                         nptr->next = sc->digestrecps;
1033                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
1034                         sc->digestrecps = nptr;
1035                 }
1036                 else if (!strcasecmp(instr, strof(ignet_push_share))) {
1037                         extract_token(nodename, buf, 1, '|', sizeof nodename);
1038                         extract_token(roomname, buf, 2, '|', sizeof roomname);
1039                         mptr = (maplist *) malloc(sizeof(maplist));
1040                         mptr->next = sc->ignet_push_shares;
1041                         strcpy(mptr->remote_nodename, nodename);
1042                         strcpy(mptr->remote_roomname, roomname);
1043                         sc->ignet_push_shares = mptr;
1044                 }
1045                 else {
1046                         /* Preserve 'other' lines ... *unless* they happen to
1047                          * be subscribe/unsubscribe pendings with expired
1048                          * timestamps.
1049                          */
1050                         skipthisline = 0;
1051                         if (!strncasecmp(buf, strof(subpending)"|", 11)) {
1052                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
1053                                         skipthisline = 1;
1054                                 }
1055                         }
1056                         if (!strncasecmp(buf, strof(unsubpending)"|", 13)) {
1057                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
1058                                         skipthisline = 1;
1059                                 }
1060                         }
1061
1062                         if (skipthisline == 0) {
1063                                 linesize = strlen(buf);
1064                                 sc->misc = realloc(sc->misc,
1065                                         (miscsize + linesize + 2) );
1066                                 sprintf(&sc->misc[miscsize], "%s\n", buf);
1067                                 miscsize = miscsize + linesize + 1;
1068                         }
1069                 }
1070
1071
1072         }
1073         fclose(fp);
1074         return 1;
1075 }
1076
1077 void free_spoolcontrol_struct(SpoolControl **scc)
1078 {
1079         SpoolControl *sc;
1080         namelist *nptr = NULL;
1081         maplist *mptr = NULL;
1082
1083         sc = *scc;
1084         while (sc->listrecps != NULL) {
1085                 nptr = sc->listrecps->next;
1086                 free(sc->listrecps);
1087                 sc->listrecps = nptr;
1088         }
1089         /* Do the same for digestrecps */
1090         while (sc->digestrecps != NULL) {
1091                 nptr = sc->digestrecps->next;
1092                 free(sc->digestrecps);
1093                 sc->digestrecps = nptr;
1094         }
1095         /* Do the same for participates */
1096         while (sc->participates != NULL) {
1097                 nptr = sc->participates->next;
1098                 free(sc->participates);
1099                 sc->participates = nptr;
1100         }
1101         while (sc->ignet_push_shares != NULL) {
1102                 mptr = sc->ignet_push_shares->next;
1103                 free(sc->ignet_push_shares);
1104                 sc->ignet_push_shares = mptr;
1105         }
1106         free(sc->misc);
1107         free(sc);
1108         *scc=NULL;
1109 }
1110
1111 int writenfree_spoolcontrol_file(SpoolControl **scc, char *filename)
1112 {
1113         char tempfilename[PATH_MAX];
1114         int TmpFD;
1115         SpoolControl *sc;
1116         namelist *nptr = NULL;
1117         maplist *mptr = NULL;
1118         long len;
1119         time_t unixtime;
1120         struct timeval tv;
1121         long reltid; /* if we don't have SYS_gettid, use "random" value */
1122         StrBuf *Cfg;
1123         int rc;
1124
1125         len = strlen(filename);
1126         memcpy(tempfilename, filename, len + 1);
1127
1128
1129 #if defined(HAVE_SYSCALL_H) && defined (SYS_gettid)
1130         reltid = syscall(SYS_gettid);
1131 #endif
1132         gettimeofday(&tv, NULL);
1133         /* Promote to time_t; types differ on some OSes (like darwin) */
1134         unixtime = tv.tv_sec;
1135
1136         sprintf(tempfilename + len, ".%ld-%ld", reltid, unixtime);
1137         sc = *scc;
1138         errno = 0;
1139         TmpFD = open(tempfilename, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
1140         Cfg = NewStrBuf();
1141         if ((TmpFD < 0) || (errno != 0)) {
1142                 syslog(LOG_CRIT, "ERROR: cannot open %s: %s\n",
1143                         filename, strerror(errno));
1144                 free_spoolcontrol_struct(scc);
1145                 unlink(tempfilename);
1146         }
1147         else {
1148                 fchown(TmpFD, config.c_ctdluid, 0);
1149                 StrBufAppendPrintf(Cfg, "lastsent|%ld\n", sc->lastsent);
1150
1151                 /* Write out the listrecps while freeing from memory at the
1152                  * same time.  Am I clever or what?  :)
1153                  */
1154                 while (sc->listrecps != NULL) {
1155                     StrBufAppendPrintf(Cfg, "listrecp|%s\n", sc->listrecps->name);
1156                         nptr = sc->listrecps->next;
1157                         free(sc->listrecps);
1158                         sc->listrecps = nptr;
1159                 }
1160                 /* Do the same for digestrecps */
1161                 while (sc->digestrecps != NULL) {
1162                         StrBufAppendPrintf(Cfg, "digestrecp|%s\n", sc->digestrecps->name);
1163                         nptr = sc->digestrecps->next;
1164                         free(sc->digestrecps);
1165                         sc->digestrecps = nptr;
1166                 }
1167                 /* Do the same for participates */
1168                 while (sc->participates != NULL) {
1169                         StrBufAppendPrintf(Cfg, "participate|%s\n", sc->participates->name);
1170                         nptr = sc->participates->next;
1171                         free(sc->participates);
1172                         sc->participates = nptr;
1173                 }
1174                 while (sc->ignet_push_shares != NULL) {
1175                         StrBufAppendPrintf(Cfg, "ignet_push_share|%s", sc->ignet_push_shares->remote_nodename);
1176                         if (!IsEmptyStr(sc->ignet_push_shares->remote_roomname)) {
1177                                 StrBufAppendPrintf(Cfg, "|%s", sc->ignet_push_shares->remote_roomname);
1178                         }
1179                         StrBufAppendPrintf(Cfg, "\n");
1180                         mptr = sc->ignet_push_shares->next;
1181                         free(sc->ignet_push_shares);
1182                         sc->ignet_push_shares = mptr;
1183                 }
1184                 if (sc->misc != NULL) {
1185                         StrBufAppendBufPlain(Cfg, sc->misc, -1, 0);
1186                 }
1187                 free(sc->misc);
1188
1189                 rc = write(TmpFD, ChrPtr(Cfg), StrLength(Cfg));
1190                 if ((rc >=0 ) && (rc == StrLength(Cfg)))
1191                 {
1192                         close(TmpFD);
1193                         rename(tempfilename, filename);
1194                 }
1195                 else {
1196                         syslog(LOG_EMERG,
1197                                       "unable to write %s; [%s]; not enough space on the disk?\n",
1198                                       tempfilename,
1199                                       strerror(errno));
1200                         close(TmpFD);
1201                         unlink(tempfilename);
1202                 }
1203                 FreeStrBuf(&Cfg);
1204                 free(sc);
1205                 *scc=NULL;
1206         }
1207         return 1;
1208 }
1209 int is_recipient(SpoolControl *sc, const char *Name)
1210 {
1211         namelist *nptr;
1212         size_t len;
1213
1214         len = strlen(Name);
1215         nptr = sc->listrecps;
1216         while (nptr != NULL) {
1217                 if (strncmp(Name, nptr->name, len)==0)
1218                         return 1;
1219                 nptr = nptr->next;
1220         }
1221         /* Do the same for digestrecps */
1222         nptr = sc->digestrecps;
1223         while (nptr != NULL) {
1224                 if (strncmp(Name, nptr->name, len)==0)
1225                         return 1;
1226                 nptr = nptr->next;
1227         }
1228         /* Do the same for participates */
1229         nptr = sc->participates;
1230         while (nptr != NULL) {
1231                 if (strncmp(Name, nptr->name, len)==0)
1232                         return 1;
1233                 nptr = nptr->next;
1234         }
1235         return 0;
1236 }
1237
1238
1239 /*
1240  * Batch up and send all outbound traffic from the current room
1241  */
1242 void network_spoolout_room(char *room_to_spool) {
1243         char buf[SIZ];
1244         char filename[PATH_MAX];
1245         SpoolControl *sc;
1246         int i;
1247
1248         /*
1249          * If the room doesn't exist, don't try to perform its networking tasks.
1250          * Normally this should never happen, but once in a while maybe a room gets
1251          * queued for networking and then deleted before it can happen.
1252          */
1253         if (CtdlGetRoom(&CC->room, room_to_spool) != 0) {
1254                 syslog(LOG_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
1255                 return;
1256         }
1257
1258         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1259         begin_critical_section(S_NETCONFIGS);
1260
1261         /* Only do net processing for rooms that have netconfigs */
1262         if (!read_spoolcontrol_file(&sc, filename))
1263         {
1264                 end_critical_section(S_NETCONFIGS);
1265                 return;
1266         }
1267         syslog(LOG_INFO, "Networking started for <%s>\n", CC->room.QRname);
1268
1269         /* If there are digest recipients, we have to build a digest */
1270         if (sc->digestrecps != NULL) {
1271                 sc->digestfp = tmpfile();
1272                 fprintf(sc->digestfp, "Content-type: text/plain\n\n");
1273         }
1274
1275         /* Do something useful */
1276         CtdlForEachMessage(MSGS_GT, sc->lastsent, NULL, NULL, NULL,
1277                 network_spool_msg, sc);
1278
1279         /* If we wrote a digest, deliver it and then close it */
1280         snprintf(buf, sizeof buf, "room_%s@%s",
1281                 CC->room.QRname, config.c_fqdn);
1282         for (i=0; buf[i]; ++i) {
1283                 buf[i] = tolower(buf[i]);
1284                 if (isspace(buf[i])) buf[i] = '_';
1285         }
1286         if (sc->digestfp != NULL) {
1287                 fprintf(sc->digestfp,   " -----------------------------------"
1288                                         "------------------------------------"
1289                                         "-------\n"
1290                                         "You are subscribed to the '%s' "
1291                                         "list.\n"
1292                                         "To post to the list: %s\n",
1293                                         CC->room.QRname, buf
1294                 );
1295                 network_deliver_digest(sc);     /* deliver and close */
1296         }
1297
1298         /* Now rewrite the config file */
1299         writenfree_spoolcontrol_file(&sc, filename);
1300         end_critical_section(S_NETCONFIGS);
1301 }
1302
1303
1304
1305 /*
1306  * Send the *entire* contents of the current room to one specific network node,
1307  * ignoring anything we know about which messages have already undergone
1308  * network processing.  This can be used to bring a new node into sync.
1309  */
1310 int network_sync_to(char *target_node) {
1311         SpoolControl sc;
1312         int num_spooled = 0;
1313         int found_node = 0;
1314         char buf[256];
1315         char sc_type[256];
1316         char sc_node[256];
1317         char sc_room[256];
1318         char filename[PATH_MAX];
1319         FILE *fp;
1320
1321         /* Grab the configuration line we're looking for */
1322         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1323         begin_critical_section(S_NETCONFIGS);
1324         fp = fopen(filename, "r");
1325         if (fp == NULL) {
1326                 end_critical_section(S_NETCONFIGS);
1327                 return(-1);
1328         }
1329         while (fgets(buf, sizeof buf, fp) != NULL) {
1330                 buf[strlen(buf)-1] = 0;
1331                 extract_token(sc_type, buf, 0, '|', sizeof sc_type);
1332                 extract_token(sc_node, buf, 1, '|', sizeof sc_node);
1333                 extract_token(sc_room, buf, 2, '|', sizeof sc_room);
1334                 if ( (!strcasecmp(sc_type, "ignet_push_share"))
1335                    && (!strcasecmp(sc_node, target_node)) ) {
1336                         found_node = 1;
1337
1338                         /* Concise syntax because we don't need a full linked-list */
1339                         memset(&sc, 0, sizeof(SpoolControl));
1340                         sc.ignet_push_shares = (maplist *)
1341                                 malloc(sizeof(maplist));
1342                         sc.ignet_push_shares->next = NULL;
1343                         safestrncpy(sc.ignet_push_shares->remote_nodename,
1344                                 sc_node,
1345                                 sizeof sc.ignet_push_shares->remote_nodename);
1346                         safestrncpy(sc.ignet_push_shares->remote_roomname,
1347                                 sc_room,
1348                                 sizeof sc.ignet_push_shares->remote_roomname);
1349                 }
1350         }
1351         fclose(fp);
1352         end_critical_section(S_NETCONFIGS);
1353
1354         if (!found_node) return(-1);
1355
1356         /* Send ALL messages */
1357         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL,
1358                 network_spool_msg, &sc);
1359
1360         /* Concise cleanup because we know there's only one node in the sc */
1361         free(sc.ignet_push_shares);
1362
1363         syslog(LOG_NOTICE, "Synchronized %d messages to <%s>\n",
1364                 num_spooled, target_node);
1365         return(num_spooled);
1366 }
1367
1368
1369 /*
1370  * Implements the NSYN command
1371  */
1372 void cmd_nsyn(char *argbuf) {
1373         int num_spooled;
1374         char target_node[256];
1375
1376         if (CtdlAccessCheck(ac_aide)) return;
1377
1378         extract_token(target_node, argbuf, 0, '|', sizeof target_node);
1379         num_spooled = network_sync_to(target_node);
1380         if (num_spooled >= 0) {
1381                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
1382         }
1383         else {
1384                 cprintf("%d No such room/node share exists.\n",
1385                         ERROR + ROOM_NOT_FOUND);
1386         }
1387 }
1388
1389
1390
1391 /*
1392  * Batch up and send all outbound traffic from the current room
1393  */
1394 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
1395         struct RoomProcList *ptr;
1396
1397         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
1398         if (ptr == NULL) return;
1399
1400         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
1401         begin_critical_section(S_RPLIST);
1402         ptr->next = rplist;
1403         rplist = ptr;
1404         end_critical_section(S_RPLIST);
1405 }
1406
1407 void destroy_network_queue_room(void)
1408 {
1409         struct RoomProcList *cur, *p;
1410         NetMap *nmcur, *nmp;
1411
1412         cur = rplist;
1413         begin_critical_section(S_RPLIST);
1414         while (cur != NULL)
1415         {
1416                 p = cur->next;
1417                 free (cur);
1418                 cur = p;
1419         }
1420         rplist = NULL;
1421         end_critical_section(S_RPLIST);
1422
1423         nmcur = the_netmap;
1424         while (nmcur != NULL)
1425         {
1426                 nmp = nmcur->next;
1427                 free (nmcur);
1428                 nmcur = nmp;
1429         }
1430         the_netmap = NULL;
1431         if (working_ignetcfg != NULL)
1432                 free (working_ignetcfg);
1433         working_ignetcfg = NULL;
1434 }
1435
1436
1437 /*
1438  * Learn topology from path fields
1439  */
1440 void network_learn_topology(char *node, char *path) {
1441         char nexthop[256];
1442         NetMap *nmptr;
1443
1444         strcpy(nexthop, "");
1445
1446         if (num_tokens(path, '!') < 3) return;
1447         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
1448                 if (!strcasecmp(nmptr->nodename, node)) {
1449                         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1450                         nmptr->lastcontact = time(NULL);
1451                         ++netmap_changed;
1452                         return;
1453                 }
1454         }
1455
1456         /* If we got here then it's not in the map, so add it. */
1457         nmptr = (NetMap *) malloc(sizeof (NetMap));
1458         strcpy(nmptr->nodename, node);
1459         nmptr->lastcontact = time(NULL);
1460         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1461         nmptr->next = the_netmap;
1462         the_netmap = nmptr;
1463         ++netmap_changed;
1464 }
1465
1466
1467
1468
1469 /*
1470  * Bounce a message back to the sender
1471  */
1472 void network_bounce(struct CtdlMessage *msg, char *reason) {
1473         char *oldpath = NULL;
1474         char buf[SIZ];
1475         char bouncesource[SIZ];
1476         char recipient[SIZ];
1477         struct recptypes *valid = NULL;
1478         char force_room[ROOMNAMELEN];
1479         static int serialnum = 0;
1480         size_t size;
1481
1482         syslog(LOG_DEBUG, "entering network_bounce()\n");
1483
1484         if (msg == NULL) return;
1485
1486         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
1487
1488         /*
1489          * Give it a fresh message ID
1490          */
1491         if (msg->cm_fields['I'] != NULL) {
1492                 free(msg->cm_fields['I']);
1493         }
1494         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
1495                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
1496         msg->cm_fields['I'] = strdup(buf);
1497
1498         /*
1499          * FIXME ... right now we're just sending a bounce; we really want to
1500          * include the text of the bounced message.
1501          */
1502         if (msg->cm_fields['M'] != NULL) {
1503                 free(msg->cm_fields['M']);
1504         }
1505         msg->cm_fields['M'] = strdup(reason);
1506         msg->cm_format_type = 0;
1507
1508         /*
1509          * Turn the message around
1510          */
1511         if (msg->cm_fields['R'] == NULL) {
1512                 free(msg->cm_fields['R']);
1513         }
1514
1515         if (msg->cm_fields['D'] == NULL) {
1516                 free(msg->cm_fields['D']);
1517         }
1518
1519         snprintf(recipient, sizeof recipient, "%s@%s",
1520                 msg->cm_fields['A'], msg->cm_fields['N']);
1521
1522         if (msg->cm_fields['A'] == NULL) {
1523                 free(msg->cm_fields['A']);
1524         }
1525
1526         if (msg->cm_fields['N'] == NULL) {
1527                 free(msg->cm_fields['N']);
1528         }
1529
1530         if (msg->cm_fields['U'] == NULL) {
1531                 free(msg->cm_fields['U']);
1532         }
1533
1534         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1535         msg->cm_fields['N'] = strdup(config.c_nodename);
1536         msg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
1537
1538         /* prepend our node to the path */
1539         if (msg->cm_fields['P'] != NULL) {
1540                 oldpath = msg->cm_fields['P'];
1541                 msg->cm_fields['P'] = NULL;
1542         }
1543         else {
1544                 oldpath = strdup("unknown_user");
1545         }
1546         size = strlen(oldpath) + SIZ;
1547         msg->cm_fields['P'] = malloc(size);
1548         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1549         free(oldpath);
1550
1551         /* Now submit the message */
1552         valid = validate_recipients(recipient, NULL, 0);
1553         if (valid != NULL) if (valid->num_error != 0) {
1554                 free_recipients(valid);
1555                 valid = NULL;
1556         }
1557         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1558                 strcpy(force_room, config.c_aideroom);
1559         }
1560         else {
1561                 strcpy(force_room, "");
1562         }
1563         if ( (valid == NULL) && IsEmptyStr(force_room) ) {
1564                 strcpy(force_room, config.c_aideroom);
1565         }
1566         CtdlSubmitMsg(msg, valid, force_room, 0);
1567
1568         /* Clean up */
1569         if (valid != NULL) free_recipients(valid);
1570         CtdlFreeMessage(msg);
1571         syslog(LOG_DEBUG, "leaving network_bounce()\n");
1572 }
1573
1574
1575
1576
1577 /*
1578  * Process a buffer containing a single message from a single file
1579  * from the inbound queue
1580  */
1581 void network_process_buffer(char *buffer, long size) {
1582         struct CtdlMessage *msg = NULL;
1583         long pos;
1584         int field;
1585         struct recptypes *recp = NULL;
1586         char target_room[ROOMNAMELEN];
1587         struct ser_ret sermsg;
1588         char *oldpath = NULL;
1589         char filename[PATH_MAX];
1590         FILE *fp;
1591         char nexthop[SIZ];
1592         unsigned char firstbyte;
1593         unsigned char lastbyte;
1594
1595         syslog(LOG_DEBUG, "network_process_buffer() processing %ld bytes\n", size);
1596
1597         /* Validate just a little bit.  First byte should be FF and * last byte should be 00. */
1598         firstbyte = buffer[0];
1599         lastbyte = buffer[size-1];
1600         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1601                 syslog(LOG_ERR, "Corrupt message ignored.  Length=%ld, firstbyte = %d, lastbyte = %d\n",
1602                         size, firstbyte, lastbyte);
1603                 return;
1604         }
1605
1606         /* Set default target room to trash */
1607         strcpy(target_room, TWITROOM);
1608
1609         /* Load the message into memory */
1610         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1611         memset(msg, 0, sizeof(struct CtdlMessage));
1612         msg->cm_magic = CTDLMESSAGE_MAGIC;
1613         msg->cm_anon_type = buffer[1];
1614         msg->cm_format_type = buffer[2];
1615
1616         for (pos = 3; pos < size; ++pos) {
1617                 field = buffer[pos];
1618                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1619                 pos = pos + strlen(&buffer[(int)pos]);
1620         }
1621
1622         /* Check for message routing */
1623         if (msg->cm_fields['D'] != NULL) {
1624                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1625
1626                         /* route the message */
1627                         strcpy(nexthop, "");
1628                         if (is_valid_node(nexthop, NULL, msg->cm_fields['D']) == 0) {
1629                                 /* prepend our node to the path */
1630                                 if (msg->cm_fields['P'] != NULL) {
1631                                         oldpath = msg->cm_fields['P'];
1632                                         msg->cm_fields['P'] = NULL;
1633                                 }
1634                                 else {
1635                                         oldpath = strdup("unknown_user");
1636                                 }
1637                                 size = strlen(oldpath) + SIZ;
1638                                 msg->cm_fields['P'] = malloc(size);
1639                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1640                                         config.c_nodename, oldpath);
1641                                 free(oldpath);
1642
1643                                 /* serialize the message */
1644                                 serialize_message(&sermsg, msg);
1645
1646                                 /* now send it */
1647                                 if (IsEmptyStr(nexthop)) {
1648                                         strcpy(nexthop, msg->cm_fields['D']);
1649                                 }
1650                                 snprintf(filename,
1651                                         sizeof filename,
1652                                         "%s/%s@%lx%x",
1653                                         ctdl_netout_dir,
1654                                         nexthop,
1655                                         time(NULL),
1656                                         rand()
1657                                 );
1658                                 syslog(LOG_DEBUG, "Appending to %s\n", filename);
1659                                 fp = fopen(filename, "ab");
1660                                 if (fp != NULL) {
1661                                         fwrite(sermsg.ser, sermsg.len, 1, fp);
1662                                         fclose(fp);
1663                                 }
1664                                 else {
1665                                         syslog(LOG_ERR, "%s: %s\n", filename, strerror(errno));
1666                                 }
1667                                 free(sermsg.ser);
1668                                 CtdlFreeMessage(msg);
1669                                 return;
1670                         }
1671
1672                         else {  /* invalid destination node name */
1673
1674                                 network_bounce(msg,
1675 "A message you sent could not be delivered due to an invalid destination node"
1676 " name.  Please check the address and try sending the message again.\n");
1677                                 msg = NULL;
1678                                 return;
1679
1680                         }
1681                 }
1682         }
1683
1684         /*
1685          * Check to see if we already have a copy of this message, and
1686          * abort its processing if so.  (We used to post a warning to Aide>
1687          * every time this happened, but the network is now so densely
1688          * connected that it's inevitable.)
1689          */
1690         if (network_usetable(msg) != 0) {
1691                 CtdlFreeMessage(msg);
1692                 return;
1693         }
1694
1695         /* Learn network topology from the path */
1696         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1697                 network_learn_topology(msg->cm_fields['N'], msg->cm_fields['P']);
1698         }
1699
1700         /* Is the sending node giving us a very persuasive suggestion about
1701          * which room this message should be saved in?  If so, go with that.
1702          */
1703         if (msg->cm_fields['C'] != NULL) {
1704                 safestrncpy(target_room, msg->cm_fields['C'], sizeof target_room);
1705         }
1706
1707         /* Otherwise, does it have a recipient?  If so, validate it... */
1708         else if (msg->cm_fields['R'] != NULL) {
1709                 recp = validate_recipients(msg->cm_fields['R'], NULL, 0);
1710                 if (recp != NULL) if (recp->num_error != 0) {
1711                         network_bounce(msg,
1712                                 "A message you sent could not be delivered due to an invalid address.\n"
1713                                 "Please check the address and try sending the message again.\n");
1714                         msg = NULL;
1715                         free_recipients(recp);
1716                         syslog(LOG_DEBUG, "Bouncing message due to invalid recipient address.\n");
1717                         return;
1718                 }
1719                 strcpy(target_room, "");        /* no target room if mail */
1720         }
1721
1722         /* Our last shot at finding a home for this message is to see if
1723          * it has the O field (Originating room) set.
1724          */
1725         else if (msg->cm_fields['O'] != NULL) {
1726                 safestrncpy(target_room, msg->cm_fields['O'], sizeof target_room);
1727         }
1728
1729         /* Strip out fields that are only relevant during transit */
1730         if (msg->cm_fields['D'] != NULL) {
1731                 free(msg->cm_fields['D']);
1732                 msg->cm_fields['D'] = NULL;
1733         }
1734         if (msg->cm_fields['C'] != NULL) {
1735                 free(msg->cm_fields['C']);
1736                 msg->cm_fields['C'] = NULL;
1737         }
1738
1739         /* save the message into a room */
1740         if (PerformNetprocHooks(msg, target_room) == 0) {
1741                 msg->cm_flags = CM_SKIP_HOOKS;
1742                 CtdlSubmitMsg(msg, recp, target_room, 0);
1743         }
1744         CtdlFreeMessage(msg);
1745         free_recipients(recp);
1746 }
1747
1748
1749 /*
1750  * Process a single message from a single file from the inbound queue
1751  */
1752 void network_process_message(FILE *fp, long msgstart, long msgend) {
1753         long hold_pos;
1754         long size;
1755         char *buffer;
1756
1757         hold_pos = ftell(fp);
1758         size = msgend - msgstart + 1;
1759         buffer = malloc(size);
1760         if (buffer != NULL) {
1761                 fseek(fp, msgstart, SEEK_SET);
1762                 if (fread(buffer, size, 1, fp) > 0) {
1763                         network_process_buffer(buffer, size);
1764                 }
1765                 free(buffer);
1766         }
1767
1768         fseek(fp, hold_pos, SEEK_SET);
1769 }
1770
1771
1772 /*
1773  * Process a single file from the inbound queue
1774  */
1775 void network_process_file(char *filename) {
1776         FILE *fp;
1777         long msgstart = (-1L);
1778         long msgend = (-1L);
1779         long msgcur = 0L;
1780         int ch;
1781
1782
1783         fp = fopen(filename, "rb");
1784         if (fp == NULL) {
1785                 syslog(LOG_CRIT, "Error opening %s: %s\n", filename, strerror(errno));
1786                 return;
1787         }
1788
1789         fseek(fp, 0L, SEEK_END);
1790         syslog(LOG_INFO, "network: processing %ld bytes from %s\n", ftell(fp), filename);
1791         rewind(fp);
1792
1793         /* Look for messages in the data stream and break them out */
1794         while (ch = getc(fp), ch >= 0) {
1795
1796                 if (ch == 255) {
1797                         if (msgstart >= 0L) {
1798                                 msgend = msgcur - 1;
1799                                 network_process_message(fp, msgstart, msgend);
1800                         }
1801                         msgstart = msgcur;
1802                 }
1803
1804                 ++msgcur;
1805         }
1806
1807         msgend = msgcur - 1;
1808         if (msgstart >= 0L) {
1809                 network_process_message(fp, msgstart, msgend);
1810         }
1811
1812         fclose(fp);
1813         unlink(filename);
1814 }
1815
1816
1817 /*
1818  * Process anything in the inbound queue
1819  */
1820 void network_do_spoolin(void) {
1821         DIR *dp;
1822         struct dirent *d;
1823         struct stat statbuf;
1824         char filename[PATH_MAX];
1825         static time_t last_spoolin_mtime = 0L;
1826
1827         /*
1828          * Check the spoolin directory's modification time.  If it hasn't
1829          * been touched, we don't need to scan it.
1830          */
1831         if (stat(ctdl_netin_dir, &statbuf)) return;
1832         if (statbuf.st_mtime == last_spoolin_mtime) {
1833                 syslog(LOG_DEBUG, "network: nothing in inbound queue\n");
1834                 return;
1835         }
1836         last_spoolin_mtime = statbuf.st_mtime;
1837         syslog(LOG_DEBUG, "network: processing inbound queue\n");
1838
1839         /*
1840          * Ok, there's something interesting in there, so scan it.
1841          */
1842         dp = opendir(ctdl_netin_dir);
1843         if (dp == NULL) return;
1844
1845         while (d = readdir(dp), d != NULL) {
1846                 if ((strcmp(d->d_name, ".")) && (strcmp(d->d_name, ".."))) {
1847                         snprintf(filename,
1848                                 sizeof filename,
1849                                 "%s/%s",
1850                                 ctdl_netin_dir,
1851                                 d->d_name
1852                         );
1853                         network_process_file(filename);
1854                 }
1855         }
1856
1857         closedir(dp);
1858 }
1859
1860 /*
1861  * Step 1: consolidate files in the outbound queue into one file per neighbor node
1862  * Step 2: delete any files in the outbound queue that were for neighbors who no longer exist.
1863  */
1864 void network_consolidate_spoolout(void) {
1865         DIR *dp;
1866         struct dirent *d;
1867         char filename[PATH_MAX];
1868         char cmd[PATH_MAX];
1869         char nexthop[256];
1870         int i;
1871         char *ptr;
1872
1873         /* Step 1: consolidate files in the outbound queue into one file per neighbor node */
1874         dp = opendir(ctdl_netout_dir);
1875         if (dp == NULL) return;
1876         while (d = readdir(dp), d != NULL) {
1877                 if (
1878                         (strcmp(d->d_name, "."))
1879                         && (strcmp(d->d_name, ".."))
1880                         && (strchr(d->d_name, '@') != NULL)
1881                 ) {
1882                         safestrncpy(nexthop, d->d_name, sizeof nexthop);
1883                         ptr = strchr(nexthop, '@');
1884                         if (ptr) *ptr = 0;
1885
1886                         snprintf(filename,
1887                                 sizeof filename,
1888                                 "%s/%s",
1889                                 ctdl_netout_dir,
1890                                 d->d_name
1891                         );
1892
1893                         syslog(LOG_DEBUG, "Consolidate %s to %s\n", filename, nexthop);
1894                         if (network_talking_to(nexthop, NTT_CHECK)) {
1895                                 syslog(LOG_DEBUG,
1896                                         "Currently online with %s - skipping for now\n",
1897                                         nexthop
1898                                 );
1899                         }
1900                         else {
1901                                 network_talking_to(nexthop, NTT_ADD);
1902                                 snprintf(cmd, sizeof cmd, "/bin/cat %s >>%s/%s && /bin/rm -f %s",
1903                                         filename,
1904                                         ctdl_netout_dir, nexthop,
1905                                         filename
1906                                 );
1907                                 system(cmd);
1908                                 network_talking_to(nexthop, NTT_REMOVE);
1909                         }
1910                 }
1911         }
1912         closedir(dp);
1913
1914         /* Step 2: delete any files in the outbound queue that were for neighbors who no longer exist */
1915
1916         dp = opendir(ctdl_netout_dir);
1917         if (dp == NULL) return;
1918
1919         while (d = readdir(dp), d != NULL) {
1920                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
1921                         continue;
1922                 ptr = strchr(d->d_name, '@');
1923                 if (d != NULL)
1924                         continue;
1925                 snprintf(filename,
1926                         sizeof filename,
1927                         "%s/%s",
1928                         ctdl_netout_dir,
1929                         d->d_name
1930                 );
1931
1932                 strcpy(nexthop, "");
1933                 i = is_valid_node(nexthop, NULL, d->d_name);
1934
1935                 if ( (i != 0) || !IsEmptyStr(nexthop) ) {
1936                         unlink(filename);
1937                 }
1938         }
1939
1940
1941         closedir(dp);
1942 }
1943
1944
1945 /*
1946  * receive network spool from the remote system
1947  */
1948 void receive_spool(int *sock, char *remote_nodename) {
1949         int download_len = 0L;
1950         int bytes_received = 0L;
1951         char buf[SIZ];
1952         char tempfilename[PATH_MAX];
1953         char permfilename[PATH_MAX];
1954         int plen;
1955         FILE *fp;
1956
1957         snprintf(tempfilename,
1958                 sizeof tempfilename,
1959                 "%s/%s.%lx%x",
1960                 ctdl_nettmp_dir,
1961                 remote_nodename,
1962                 time(NULL),
1963                 rand()
1964         );
1965
1966         snprintf(permfilename,
1967                 sizeof permfilename,
1968                 "%s/%s.%lx%x",
1969                 ctdl_netin_dir,
1970                 remote_nodename,
1971                 time(NULL),
1972                 rand()
1973         );
1974
1975         if (sock_puts(sock, "NDOP") < 0) return;
1976         if (sock_getln(sock, buf, sizeof buf) < 0) return;
1977         syslog(LOG_DEBUG, "<%s\n", buf);
1978         if (buf[0] != '2') {
1979                 return;
1980         }
1981
1982         download_len = extract_long(&buf[4], 0);
1983         if (download_len <= 0) {
1984                 return;
1985         }
1986
1987         bytes_received = 0L;
1988         fp = fopen(tempfilename, "w");
1989         if (fp == NULL) {
1990                 syslog(LOG_CRIT, "Cannot create %s: %s\n", tempfilename, strerror(errno));
1991                 return;
1992         }
1993
1994         syslog(LOG_DEBUG, "Expecting to transfer %d bytes\n", download_len);
1995         while (bytes_received < download_len) {
1996                 /*
1997                  * If shutting down we can exit here and unlink the temp file.
1998                  * this shouldn't loose us any messages.
1999                  */
2000                 if (server_shutting_down)
2001                 {
2002                         fclose(fp);
2003                         unlink(tempfilename);
2004                         return;
2005                 }
2006                 snprintf(buf, sizeof buf, "READ %d|%d",
2007                          bytes_received,
2008                          ((download_len - bytes_received > IGNET_PACKET_SIZE)
2009                           ? IGNET_PACKET_SIZE : (download_len - bytes_received))
2010                 );
2011
2012                 if (sock_puts(sock, buf) < 0) {
2013                         fclose(fp);
2014                         unlink(tempfilename);
2015                         return;
2016                 }
2017                 if (sock_getln(sock, buf, sizeof buf) < 0) {
2018                         fclose(fp);
2019                         unlink(tempfilename);
2020                         return;
2021                 }
2022
2023                 if (buf[0] == '6') {
2024                         plen = extract_int(&buf[4], 0);
2025                         StrBuf *pbuf = NewStrBuf();
2026                         if (socket_read_blob(sock, pbuf, plen, CLIENT_TIMEOUT) != plen) {
2027                                 syslog(LOG_INFO, "Short read from peer; aborting.\n");
2028                                 fclose(fp);
2029                                 unlink(tempfilename);
2030                                 FreeStrBuf(&pbuf);
2031                                 return;
2032                         }
2033                         fwrite(ChrPtr(pbuf), plen, 1, fp);
2034                         bytes_received += plen;
2035                         FreeStrBuf(&pbuf);
2036                 }
2037         }
2038
2039         fclose(fp);
2040
2041         /* Last chance for shutdown exit */
2042         if (server_shutting_down)
2043         {
2044                 unlink(tempfilename);
2045                 return;
2046         }
2047
2048         if (sock_puts(sock, "CLOS") < 0) {
2049                 unlink(tempfilename);
2050                 return;
2051         }
2052
2053         /*
2054          * From here on we must complete or messages will get lost
2055          */
2056         if (sock_getln(sock, buf, sizeof buf) < 0) {
2057                 unlink(tempfilename);
2058                 return;
2059         }
2060
2061         syslog(LOG_DEBUG, "%s\n", buf);
2062
2063         /*
2064          * Now move the temp file to its permanent location.
2065          */
2066         if (link(tempfilename, permfilename) != 0) {
2067                 syslog(LOG_ALERT, "Could not link %s to %s: %s\n",
2068                         tempfilename, permfilename, strerror(errno)
2069                 );
2070         }
2071
2072         unlink(tempfilename);
2073 }
2074
2075
2076
2077 /*
2078  * transmit network spool to the remote system
2079  */
2080 void transmit_spool(int *sock, char *remote_nodename)
2081 {
2082         char buf[SIZ];
2083         char pbuf[4096];
2084         long plen;
2085         long bytes_to_write, thisblock, bytes_written;
2086         int fd;
2087         char sfname[128];
2088
2089         if (sock_puts(sock, "NUOP") < 0) return;
2090         if (sock_getln(sock, buf, sizeof buf) < 0) return;
2091         syslog(LOG_DEBUG, "<%s\n", buf);
2092         if (buf[0] != '2') {
2093                 return;
2094         }
2095
2096         snprintf(sfname, sizeof sfname,
2097                 "%s/%s",
2098                 ctdl_netout_dir,
2099                 remote_nodename
2100         );
2101         fd = open(sfname, O_RDONLY);
2102         if (fd < 0) {
2103                 if (errno != ENOENT) {
2104                         syslog(LOG_CRIT, "cannot open %s: %s\n", sfname, strerror(errno));
2105                 }
2106                 return;
2107         }
2108         bytes_written = 0;
2109         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
2110                 bytes_to_write = plen;
2111                 while (bytes_to_write > 0L) {
2112                         /* Exit if shutting down */
2113                         if (server_shutting_down)
2114                         {
2115                                 close(fd);
2116                                 return;
2117                         }
2118
2119                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
2120                         if (sock_puts(sock, buf) < 0) {
2121                                 close(fd);
2122                                 return;
2123                         }
2124                         if (sock_getln(sock, buf, sizeof buf) < 0) {
2125                                 close(fd);
2126                                 return;
2127                         }
2128                         thisblock = atol(&buf[4]);
2129                         if (buf[0] == '7') {
2130                                 if (sock_write(sock, pbuf, (int) thisblock) < 0) {
2131                                         close(fd);
2132                                         return;
2133                                 }
2134                                 bytes_to_write -= thisblock;
2135                                 bytes_written += thisblock;
2136                         } else {
2137                                 goto ABORTUPL;
2138                         }
2139                 }
2140         }
2141
2142 ABORTUPL:
2143         close(fd);
2144
2145         /* Last chance for shutdown exit */
2146         if(server_shutting_down)
2147                 return;
2148
2149         if (sock_puts(sock, "UCLS 1") < 0) return;
2150
2151         /*
2152          * From here on we must complete or messages will get lost
2153          */
2154         if (sock_getln(sock, buf, sizeof buf) < 0) return;
2155         syslog(LOG_NOTICE, "Sent %ld octets to <%s>\n", bytes_written, remote_nodename);
2156         syslog(LOG_DEBUG, "<%s\n", buf);
2157         if (buf[0] == '2') {
2158                 syslog(LOG_DEBUG, "Removing <%s>\n", sfname);
2159                 unlink(sfname);
2160         }
2161 }
2162
2163
2164
2165 /*
2166  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
2167  */
2168 void network_poll_node(char *node, char *secret, char *host, char *port) {
2169         int sock;
2170         char buf[SIZ];
2171         char err_buf[SIZ];
2172         char connected_to[SIZ];
2173         CitContext *CCC=CC;
2174
2175         if (network_talking_to(node, NTT_CHECK)) return;
2176         network_talking_to(node, NTT_ADD);
2177         syslog(LOG_DEBUG, "network: polling <%s>\n", node);
2178         syslog(LOG_NOTICE, "Connecting to <%s> at %s:%s\n", node, host, port);
2179
2180         sock = sock_connect(host, port);
2181         if (sock < 0) {
2182                 syslog(LOG_ERR, "Could not connect: %s\n", strerror(errno));
2183                 network_talking_to(node, NTT_REMOVE);
2184                 return;
2185         }
2186
2187         syslog(LOG_DEBUG, "Connected!\n");
2188         CCC->SBuf.Buf = NewStrBuf();
2189         CCC->sMigrateBuf = NewStrBuf();
2190         CCC->SBuf.ReadWritePointer = NULL;
2191
2192         /* Read the server greeting */
2193         if (sock_getln(&sock, buf, sizeof buf) < 0) goto bail;
2194         syslog(LOG_DEBUG, ">%s\n", buf);
2195
2196         /* Check that the remote is who we think it is and warn the Aide if not */
2197         extract_token (connected_to, buf, 1, ' ', sizeof connected_to);
2198         if (strcmp(connected_to, node))
2199         {
2200                 snprintf(err_buf, sizeof(err_buf),
2201                         "Connected to node \"%s\" but I was expecting to connect to node \"%s\".",
2202                         connected_to, node
2203                 );
2204                 syslog(LOG_ERR, "%s\n", err_buf);
2205                 CtdlAideMessage(err_buf, "Network error");
2206         }
2207         else {
2208                 /* We're talking to the correct node.  Now identify ourselves. */
2209                 snprintf(buf, sizeof buf, "NETP %s|%s", config.c_nodename, secret);
2210                 syslog(LOG_DEBUG, "<%s\n", buf);
2211                 if (sock_puts(&sock, buf) <0) goto bail;
2212                 if (sock_getln(&sock, buf, sizeof buf) < 0) goto bail;
2213                 syslog(LOG_DEBUG, ">%s\n", buf);
2214                 if (buf[0] != '2') {
2215                         goto bail;
2216                 }
2217
2218                 /* At this point we are authenticated. */
2219                 if (!server_shutting_down)
2220                         receive_spool(&sock, node);
2221                 if (!server_shutting_down)
2222                         transmit_spool(&sock, node);
2223         }
2224
2225         sock_puts(&sock, "QUIT");
2226 bail:
2227         FreeStrBuf(&CCC->SBuf.Buf);
2228         FreeStrBuf(&CCC->sMigrateBuf);
2229         if (sock != -1)
2230                 sock_close(sock);
2231         network_talking_to(node, NTT_REMOVE);
2232 }
2233
2234
2235
2236 /*
2237  * Poll other Citadel nodes and transfer inbound/outbound network data.
2238  * Set "full" to nonzero to force a poll of every node, or to zero to poll
2239  * only nodes to which we have data to send.
2240  */
2241 void network_poll_other_citadel_nodes(int full_poll) {
2242         int i;
2243         char linebuf[256];
2244         char node[SIZ];
2245         char host[256];
2246         char port[256];
2247         char secret[256];
2248         int poll = 0;
2249         char spoolfile[256];
2250
2251         if (working_ignetcfg == NULL) {
2252                 syslog(LOG_DEBUG, "network: no neighbor nodes are configured - not polling.\n");
2253                 return;
2254         }
2255
2256         /* Use the string tokenizer to grab one line at a time */
2257         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
2258                 if(server_shutting_down)
2259                         return;
2260                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
2261                 extract_token(node, linebuf, 0, '|', sizeof node);
2262                 extract_token(secret, linebuf, 1, '|', sizeof secret);
2263                 extract_token(host, linebuf, 2, '|', sizeof host);
2264                 extract_token(port, linebuf, 3, '|', sizeof port);
2265                 if ( !IsEmptyStr(node) && !IsEmptyStr(secret)
2266                    && !IsEmptyStr(host) && !IsEmptyStr(port)) {
2267                         poll = full_poll;
2268                         if (poll == 0) {
2269                                 snprintf(spoolfile,
2270                                          sizeof spoolfile,
2271                                          "%s/%s",
2272                                          ctdl_netout_dir,
2273                                          node
2274                                 );
2275                                 if (access(spoolfile, R_OK) == 0) {
2276                                         poll = 1;
2277                                 }
2278                         }
2279                         if (poll) {
2280                                 network_poll_node(node, secret, host, port);
2281                         }
2282                 }
2283         }
2284
2285 }
2286
2287
2288
2289
2290 /*
2291  * It's ok if these directories already exist.  Just fail silently.
2292  */
2293 void create_spool_dirs(void) {
2294         if ((mkdir(ctdl_spool_dir, 0700) != 0) && (errno != EEXIST))
2295                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_spool_dir, strerror(errno));
2296         if (chown(ctdl_spool_dir, CTDLUID, (-1)) != 0)
2297                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_spool_dir, strerror(errno));
2298         if ((mkdir(ctdl_netin_dir, 0700) != 0) && (errno != EEXIST))
2299                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_netin_dir, strerror(errno));
2300         if (chown(ctdl_netin_dir, CTDLUID, (-1)) != 0)
2301                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netin_dir, strerror(errno));
2302         if ((mkdir(ctdl_nettmp_dir, 0700) != 0) && (errno != EEXIST))
2303                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_nettmp_dir, strerror(errno));
2304         if (chown(ctdl_nettmp_dir, CTDLUID, (-1)) != 0)
2305                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_nettmp_dir, strerror(errno));
2306         if ((mkdir(ctdl_netout_dir, 0700) != 0) && (errno != EEXIST))
2307                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_netout_dir, strerror(errno));
2308         if (chown(ctdl_netout_dir, CTDLUID, (-1)) != 0)
2309                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netout_dir, strerror(errno));
2310 }
2311
2312
2313
2314
2315
2316 /*
2317  * network_do_queue()
2318  *
2319  * Run through the rooms doing various types of network stuff.
2320  */
2321 void network_do_queue(void) {
2322         static int doing_queue = 0;
2323         static time_t last_run = 0L;
2324         struct RoomProcList *ptr;
2325         int full_processing = 1;
2326
2327         /*
2328          * Run the full set of processing tasks no more frequently
2329          * than once every n seconds
2330          */
2331         if ( (time(NULL) - last_run) < config.c_net_freq ) {
2332                 full_processing = 0;
2333                 syslog(LOG_DEBUG, "Network full processing in %ld seconds.\n",
2334                         config.c_net_freq - (time(NULL)- last_run)
2335                 );
2336         }
2337
2338         /*
2339          * This is a simple concurrency check to make sure only one queue run
2340          * is done at a time.  We could do this with a mutex, but since we
2341          * don't really require extremely fine granularity here, we'll do it
2342          * with a static variable instead.
2343          */
2344         if (doing_queue) {
2345                 return;
2346         }
2347         doing_queue = 1;
2348
2349         /* Load the IGnet Configuration into memory */
2350         load_working_ignetcfg();
2351
2352         /*
2353          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
2354          * then we poll everyone.  Otherwise we only poll nodes we have stuff
2355          * to send to.
2356          */
2357         network_poll_other_citadel_nodes(full_processing);
2358
2359         /*
2360          * Load the network map and filter list into memory.
2361          */
2362         read_network_map();
2363         filterlist = load_filter_list();
2364
2365         /*
2366          * Go ahead and run the queue
2367          */
2368         if (full_processing && !server_shutting_down) {
2369                 syslog(LOG_DEBUG, "network: loading outbound queue\n");
2370                 CtdlForEachRoom(network_queue_room, NULL);
2371         }
2372
2373         if (rplist != NULL) {
2374                 syslog(LOG_DEBUG, "network: running outbound queue\n");
2375                 while (rplist != NULL && !server_shutting_down) {
2376                         char spoolroomname[ROOMNAMELEN];
2377                         safestrncpy(spoolroomname, rplist->name, sizeof spoolroomname);
2378                         begin_critical_section(S_RPLIST);
2379
2380                         /* pop this record off the list */
2381                         ptr = rplist;
2382                         rplist = rplist->next;
2383                         free(ptr);
2384
2385                         /* invalidate any duplicate entries to prevent double processing */
2386                         for (ptr=rplist; ptr!=NULL; ptr=ptr->next) {
2387                                 if (!strcasecmp(ptr->name, spoolroomname)) {
2388                                         ptr->name[0] = 0;
2389                                 }
2390                         }
2391
2392                         end_critical_section(S_RPLIST);
2393                         if (spoolroomname[0] != 0) {
2394                                 network_spoolout_room(spoolroomname);
2395                         }
2396                 }
2397         }
2398
2399         /* If there is anything in the inbound queue, process it */
2400         if (!server_shutting_down) {
2401                 network_do_spoolin();
2402         }
2403
2404         /* Save the network map back to disk */
2405         write_network_map();
2406
2407         /* Free the filter list in memory */
2408         free_filter_list(filterlist);
2409         filterlist = NULL;
2410
2411         network_consolidate_spoolout();
2412
2413         syslog(LOG_DEBUG, "network: queue run completed\n");
2414
2415         if (full_processing) {
2416                 last_run = time(NULL);
2417         }
2418
2419         doing_queue = 0;
2420 }
2421
2422
2423 /*
2424  * cmd_netp() - authenticate to the server as another Citadel node polling
2425  *            for network traffic
2426  */
2427 void cmd_netp(char *cmdbuf)
2428 {
2429         char node[256];
2430         char pass[256];
2431         int v;
2432
2433         char secret[256];
2434         char nexthop[256];
2435         char err_buf[SIZ];
2436
2437         /* Authenticate */
2438         extract_token(node, cmdbuf, 0, '|', sizeof node);
2439         extract_token(pass, cmdbuf, 1, '|', sizeof pass);
2440
2441         /* load the IGnet Configuration to check node validity */
2442         load_working_ignetcfg();
2443         v = is_valid_node(nexthop, secret, node);
2444
2445         if (v != 0) {
2446                 snprintf(err_buf, sizeof err_buf,
2447                         "An unknown Citadel server called \"%s\" attempted to connect from %s [%s].\n",
2448                         node, CC->cs_host, CC->cs_addr
2449                 );
2450                 syslog(LOG_WARNING, "%s", err_buf);
2451                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2452                 CtdlAideMessage(err_buf, "IGNet Networking.");
2453                 return;
2454         }
2455
2456         if (strcasecmp(pass, secret)) {
2457                 snprintf(err_buf, sizeof err_buf,
2458                         "A Citadel server at %s [%s] failed to authenticate as network node \"%s\".\n",
2459                         CC->cs_host, CC->cs_addr, node
2460                 );
2461                 syslog(LOG_WARNING, "%s", err_buf);
2462                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2463                 CtdlAideMessage(err_buf, "IGNet Networking.");
2464                 return;
2465         }
2466
2467         if (network_talking_to(node, NTT_CHECK)) {
2468                 syslog(LOG_WARNING, "Duplicate session for network node <%s>", node);
2469                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
2470                 return;
2471         }
2472
2473         safestrncpy(CC->net_node, node, sizeof CC->net_node);
2474         network_talking_to(node, NTT_ADD);
2475         syslog(LOG_NOTICE, "Network node <%s> logged in from %s [%s]\n",
2476                 CC->net_node, CC->cs_host, CC->cs_addr
2477         );
2478         cprintf("%d authenticated as network node '%s'\n", CIT_OK, CC->net_node);
2479 }
2480
2481
2482 int network_room_handler (struct ctdlroom *room)
2483 {
2484         network_queue_room(room, NULL);
2485         return 0;
2486 }
2487
2488
2489 /*
2490  * Module entry point
2491  */
2492 CTDL_MODULE_INIT(network)
2493 {
2494         if (!threading)
2495         {
2496                 create_spool_dirs();
2497                 CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
2498                 CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
2499                 CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
2500                 CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
2501                 CtdlRegisterRoomHook(network_room_handler);
2502                 CtdlRegisterCleanupHook(destroy_network_queue_room);
2503                 CtdlRegisterSessionHook(network_do_queue, EVT_TIMER);
2504         }
2505         return "network";
2506 }