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                 StrBufAppendPrintf(Cfg, "lastsent|%ld\n", sc->lastsent);
1149
1150                 /* Write out the listrecps while freeing from memory at the
1151                  * same time.  Am I clever or what?  :)
1152                  */
1153                 while (sc->listrecps != NULL) {
1154                         StrBufAppendPrintf(Cfg, "listrecp|%s\n", sc->listrecps->name);
1155                         nptr = sc->listrecps->next;
1156                         free(sc->listrecps);
1157                         sc->listrecps = nptr;
1158                 }
1159                 /* Do the same for digestrecps */
1160                 while (sc->digestrecps != NULL) {
1161                         StrBufAppendPrintf(Cfg, "digestrecp|%s\n", sc->digestrecps->name);
1162                         nptr = sc->digestrecps->next;
1163                         free(sc->digestrecps);
1164                         sc->digestrecps = nptr;
1165                 }
1166                 /* Do the same for participates */
1167                 while (sc->participates != NULL) {
1168                         StrBufAppendPrintf(Cfg, "participate|%s\n", sc->participates->name);
1169                         nptr = sc->participates->next;
1170                         free(sc->participates);
1171                         sc->participates = nptr;
1172                 }
1173                 while (sc->ignet_push_shares != NULL) {
1174                         StrBufAppendPrintf(Cfg, "ignet_push_share|%s", sc->ignet_push_shares->remote_nodename);
1175                         if (!IsEmptyStr(sc->ignet_push_shares->remote_roomname)) {
1176                                 StrBufAppendPrintf(Cfg, "|%s", sc->ignet_push_shares->remote_roomname);
1177                         }
1178                         StrBufAppendPrintf(Cfg, "\n");
1179                         mptr = sc->ignet_push_shares->next;
1180                         free(sc->ignet_push_shares);
1181                         sc->ignet_push_shares = mptr;
1182                 }
1183                 if (sc->misc != NULL) {
1184                         StrBufAppendBufPlain(Cfg, sc->misc, -1, 0);
1185                 }
1186                 free(sc->misc);
1187
1188                 rc = write(TmpFD, ChrPtr(Cfg), StrLength(Cfg));
1189                 if ((rc >=0 ) && (rc == StrLength(Cfg)))
1190                 {
1191                         close(TmpFD);
1192                         rename(tempfilename, filename);
1193                 }
1194                 else {
1195                         syslog(LOG_EMERG,
1196                                       "unable to write %s; [%s]; not enough space on the disk?\n",
1197                                       tempfilename,
1198                                       strerror(errno));
1199                         close(TmpFD);
1200                         unlink(tempfilename);
1201                 }
1202                 FreeStrBuf(&Cfg);
1203                 free(sc);
1204                 *scc=NULL;
1205         }
1206         return 1;
1207 }
1208 int is_recipient(SpoolControl *sc, const char *Name)
1209 {
1210         namelist *nptr;
1211         size_t len;
1212
1213         len = strlen(Name);
1214         nptr = sc->listrecps;
1215         while (nptr != NULL) {
1216                 if (strncmp(Name, nptr->name, len)==0)
1217                         return 1;
1218                 nptr = nptr->next;
1219         }
1220         /* Do the same for digestrecps */
1221         nptr = sc->digestrecps;
1222         while (nptr != NULL) {
1223                 if (strncmp(Name, nptr->name, len)==0)
1224                         return 1;
1225                 nptr = nptr->next;
1226         }
1227         /* Do the same for participates */
1228         nptr = sc->participates;
1229         while (nptr != NULL) {
1230                 if (strncmp(Name, nptr->name, len)==0)
1231                         return 1;
1232                 nptr = nptr->next;
1233         }
1234         return 0;
1235 }
1236
1237
1238 /*
1239  * Batch up and send all outbound traffic from the current room
1240  */
1241 void network_spoolout_room(char *room_to_spool) {
1242         char buf[SIZ];
1243         char filename[PATH_MAX];
1244         SpoolControl *sc;
1245         int i;
1246
1247         /*
1248          * If the room doesn't exist, don't try to perform its networking tasks.
1249          * Normally this should never happen, but once in a while maybe a room gets
1250          * queued for networking and then deleted before it can happen.
1251          */
1252         if (CtdlGetRoom(&CC->room, room_to_spool) != 0) {
1253                 syslog(LOG_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
1254                 return;
1255         }
1256
1257         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1258         begin_critical_section(S_NETCONFIGS);
1259
1260         /* Only do net processing for rooms that have netconfigs */
1261         if (!read_spoolcontrol_file(&sc, filename))
1262         {
1263                 end_critical_section(S_NETCONFIGS);
1264                 return;
1265         }
1266         syslog(LOG_INFO, "Networking started for <%s>\n", CC->room.QRname);
1267
1268         /* If there are digest recipients, we have to build a digest */
1269         if (sc->digestrecps != NULL) {
1270                 sc->digestfp = tmpfile();
1271                 fprintf(sc->digestfp, "Content-type: text/plain\n\n");
1272         }
1273
1274         /* Do something useful */
1275         CtdlForEachMessage(MSGS_GT, sc->lastsent, NULL, NULL, NULL,
1276                 network_spool_msg, sc);
1277
1278         /* If we wrote a digest, deliver it and then close it */
1279         snprintf(buf, sizeof buf, "room_%s@%s",
1280                 CC->room.QRname, config.c_fqdn);
1281         for (i=0; buf[i]; ++i) {
1282                 buf[i] = tolower(buf[i]);
1283                 if (isspace(buf[i])) buf[i] = '_';
1284         }
1285         if (sc->digestfp != NULL) {
1286                 fprintf(sc->digestfp,   " -----------------------------------"
1287                                         "------------------------------------"
1288                                         "-------\n"
1289                                         "You are subscribed to the '%s' "
1290                                         "list.\n"
1291                                         "To post to the list: %s\n",
1292                                         CC->room.QRname, buf
1293                 );
1294                 network_deliver_digest(sc);     /* deliver and close */
1295         }
1296
1297         /* Now rewrite the config file */
1298         writenfree_spoolcontrol_file (&sc, filename);
1299         end_critical_section(S_NETCONFIGS);
1300 }
1301
1302
1303
1304 /*
1305  * Send the *entire* contents of the current room to one specific network node,
1306  * ignoring anything we know about which messages have already undergone
1307  * network processing.  This can be used to bring a new node into sync.
1308  */
1309 int network_sync_to(char *target_node) {
1310         SpoolControl sc;
1311         int num_spooled = 0;
1312         int found_node = 0;
1313         char buf[256];
1314         char sc_type[256];
1315         char sc_node[256];
1316         char sc_room[256];
1317         char filename[PATH_MAX];
1318         FILE *fp;
1319
1320         /* Grab the configuration line we're looking for */
1321         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1322         begin_critical_section(S_NETCONFIGS);
1323         fp = fopen(filename, "r");
1324         if (fp == NULL) {
1325                 end_critical_section(S_NETCONFIGS);
1326                 return(-1);
1327         }
1328         while (fgets(buf, sizeof buf, fp) != NULL) {
1329                 buf[strlen(buf)-1] = 0;
1330                 extract_token(sc_type, buf, 0, '|', sizeof sc_type);
1331                 extract_token(sc_node, buf, 1, '|', sizeof sc_node);
1332                 extract_token(sc_room, buf, 2, '|', sizeof sc_room);
1333                 if ( (!strcasecmp(sc_type, "ignet_push_share"))
1334                    && (!strcasecmp(sc_node, target_node)) ) {
1335                         found_node = 1;
1336
1337                         /* Concise syntax because we don't need a full linked-list */
1338                         memset(&sc, 0, sizeof(SpoolControl));
1339                         sc.ignet_push_shares = (maplist *)
1340                                 malloc(sizeof(maplist));
1341                         sc.ignet_push_shares->next = NULL;
1342                         safestrncpy(sc.ignet_push_shares->remote_nodename,
1343                                 sc_node,
1344                                 sizeof sc.ignet_push_shares->remote_nodename);
1345                         safestrncpy(sc.ignet_push_shares->remote_roomname,
1346                                 sc_room,
1347                                 sizeof sc.ignet_push_shares->remote_roomname);
1348                 }
1349         }
1350         fclose(fp);
1351         end_critical_section(S_NETCONFIGS);
1352
1353         if (!found_node) return(-1);
1354
1355         /* Send ALL messages */
1356         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL,
1357                 network_spool_msg, &sc);
1358
1359         /* Concise cleanup because we know there's only one node in the sc */
1360         free(sc.ignet_push_shares);
1361
1362         syslog(LOG_NOTICE, "Synchronized %d messages to <%s>\n",
1363                 num_spooled, target_node);
1364         return(num_spooled);
1365 }
1366
1367
1368 /*
1369  * Implements the NSYN command
1370  */
1371 void cmd_nsyn(char *argbuf) {
1372         int num_spooled;
1373         char target_node[256];
1374
1375         if (CtdlAccessCheck(ac_aide)) return;
1376
1377         extract_token(target_node, argbuf, 0, '|', sizeof target_node);
1378         num_spooled = network_sync_to(target_node);
1379         if (num_spooled >= 0) {
1380                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
1381         }
1382         else {
1383                 cprintf("%d No such room/node share exists.\n",
1384                         ERROR + ROOM_NOT_FOUND);
1385         }
1386 }
1387
1388
1389
1390 /*
1391  * Batch up and send all outbound traffic from the current room
1392  */
1393 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
1394         struct RoomProcList *ptr;
1395
1396         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
1397         if (ptr == NULL) return;
1398
1399         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
1400         begin_critical_section(S_RPLIST);
1401         ptr->next = rplist;
1402         rplist = ptr;
1403         end_critical_section(S_RPLIST);
1404 }
1405
1406 void destroy_network_queue_room(void)
1407 {
1408         struct RoomProcList *cur, *p;
1409         NetMap *nmcur, *nmp;
1410
1411         cur = rplist;
1412         begin_critical_section(S_RPLIST);
1413         while (cur != NULL)
1414         {
1415                 p = cur->next;
1416                 free (cur);
1417                 cur = p;
1418         }
1419         rplist = NULL;
1420         end_critical_section(S_RPLIST);
1421
1422         nmcur = the_netmap;
1423         while (nmcur != NULL)
1424         {
1425                 nmp = nmcur->next;
1426                 free (nmcur);
1427                 nmcur = nmp;
1428         }
1429         the_netmap = NULL;
1430         if (working_ignetcfg != NULL)
1431                 free (working_ignetcfg);
1432         working_ignetcfg = NULL;
1433 }
1434
1435
1436 /*
1437  * Learn topology from path fields
1438  */
1439 void network_learn_topology(char *node, char *path) {
1440         char nexthop[256];
1441         NetMap *nmptr;
1442
1443         strcpy(nexthop, "");
1444
1445         if (num_tokens(path, '!') < 3) return;
1446         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
1447                 if (!strcasecmp(nmptr->nodename, node)) {
1448                         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1449                         nmptr->lastcontact = time(NULL);
1450                         ++netmap_changed;
1451                         return;
1452                 }
1453         }
1454
1455         /* If we got here then it's not in the map, so add it. */
1456         nmptr = (NetMap *) malloc(sizeof (NetMap));
1457         strcpy(nmptr->nodename, node);
1458         nmptr->lastcontact = time(NULL);
1459         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1460         nmptr->next = the_netmap;
1461         the_netmap = nmptr;
1462         ++netmap_changed;
1463 }
1464
1465
1466
1467
1468 /*
1469  * Bounce a message back to the sender
1470  */
1471 void network_bounce(struct CtdlMessage *msg, char *reason) {
1472         char *oldpath = NULL;
1473         char buf[SIZ];
1474         char bouncesource[SIZ];
1475         char recipient[SIZ];
1476         struct recptypes *valid = NULL;
1477         char force_room[ROOMNAMELEN];
1478         static int serialnum = 0;
1479         size_t size;
1480
1481         syslog(LOG_DEBUG, "entering network_bounce()\n");
1482
1483         if (msg == NULL) return;
1484
1485         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
1486
1487         /*
1488          * Give it a fresh message ID
1489          */
1490         if (msg->cm_fields['I'] != NULL) {
1491                 free(msg->cm_fields['I']);
1492         }
1493         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
1494                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
1495         msg->cm_fields['I'] = strdup(buf);
1496
1497         /*
1498          * FIXME ... right now we're just sending a bounce; we really want to
1499          * include the text of the bounced message.
1500          */
1501         if (msg->cm_fields['M'] != NULL) {
1502                 free(msg->cm_fields['M']);
1503         }
1504         msg->cm_fields['M'] = strdup(reason);
1505         msg->cm_format_type = 0;
1506
1507         /*
1508          * Turn the message around
1509          */
1510         if (msg->cm_fields['R'] == NULL) {
1511                 free(msg->cm_fields['R']);
1512         }
1513
1514         if (msg->cm_fields['D'] == NULL) {
1515                 free(msg->cm_fields['D']);
1516         }
1517
1518         snprintf(recipient, sizeof recipient, "%s@%s",
1519                 msg->cm_fields['A'], msg->cm_fields['N']);
1520
1521         if (msg->cm_fields['A'] == NULL) {
1522                 free(msg->cm_fields['A']);
1523         }
1524
1525         if (msg->cm_fields['N'] == NULL) {
1526                 free(msg->cm_fields['N']);
1527         }
1528
1529         if (msg->cm_fields['U'] == NULL) {
1530                 free(msg->cm_fields['U']);
1531         }
1532
1533         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1534         msg->cm_fields['N'] = strdup(config.c_nodename);
1535         msg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
1536
1537         /* prepend our node to the path */
1538         if (msg->cm_fields['P'] != NULL) {
1539                 oldpath = msg->cm_fields['P'];
1540                 msg->cm_fields['P'] = NULL;
1541         }
1542         else {
1543                 oldpath = strdup("unknown_user");
1544         }
1545         size = strlen(oldpath) + SIZ;
1546         msg->cm_fields['P'] = malloc(size);
1547         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1548         free(oldpath);
1549
1550         /* Now submit the message */
1551         valid = validate_recipients(recipient, NULL, 0);
1552         if (valid != NULL) if (valid->num_error != 0) {
1553                 free_recipients(valid);
1554                 valid = NULL;
1555         }
1556         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1557                 strcpy(force_room, config.c_aideroom);
1558         }
1559         else {
1560                 strcpy(force_room, "");
1561         }
1562         if ( (valid == NULL) && IsEmptyStr(force_room) ) {
1563                 strcpy(force_room, config.c_aideroom);
1564         }
1565         CtdlSubmitMsg(msg, valid, force_room, 0);
1566
1567         /* Clean up */
1568         if (valid != NULL) free_recipients(valid);
1569         CtdlFreeMessage(msg);
1570         syslog(LOG_DEBUG, "leaving network_bounce()\n");
1571 }
1572
1573
1574
1575
1576 /*
1577  * Process a buffer containing a single message from a single file
1578  * from the inbound queue
1579  */
1580 void network_process_buffer(char *buffer, long size) {
1581         struct CtdlMessage *msg = NULL;
1582         long pos;
1583         int field;
1584         struct recptypes *recp = NULL;
1585         char target_room[ROOMNAMELEN];
1586         struct ser_ret sermsg;
1587         char *oldpath = NULL;
1588         char filename[PATH_MAX];
1589         FILE *fp;
1590         char nexthop[SIZ];
1591         unsigned char firstbyte;
1592         unsigned char lastbyte;
1593
1594         syslog(LOG_DEBUG, "network_process_buffer() processing %ld bytes\n", size);
1595
1596         /* Validate just a little bit.  First byte should be FF and * last byte should be 00. */
1597         firstbyte = buffer[0];
1598         lastbyte = buffer[size-1];
1599         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1600                 syslog(LOG_ERR, "Corrupt message ignored.  Length=%ld, firstbyte = %d, lastbyte = %d\n",
1601                         size, firstbyte, lastbyte);
1602                 return;
1603         }
1604
1605         /* Set default target room to trash */
1606         strcpy(target_room, TWITROOM);
1607
1608         /* Load the message into memory */
1609         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1610         memset(msg, 0, sizeof(struct CtdlMessage));
1611         msg->cm_magic = CTDLMESSAGE_MAGIC;
1612         msg->cm_anon_type = buffer[1];
1613         msg->cm_format_type = buffer[2];
1614
1615         for (pos = 3; pos < size; ++pos) {
1616                 field = buffer[pos];
1617                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1618                 pos = pos + strlen(&buffer[(int)pos]);
1619         }
1620
1621         /* Check for message routing */
1622         if (msg->cm_fields['D'] != NULL) {
1623                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1624
1625                         /* route the message */
1626                         strcpy(nexthop, "");
1627                         if (is_valid_node(nexthop, NULL, msg->cm_fields['D']) == 0) {
1628                                 /* prepend our node to the path */
1629                                 if (msg->cm_fields['P'] != NULL) {
1630                                         oldpath = msg->cm_fields['P'];
1631                                         msg->cm_fields['P'] = NULL;
1632                                 }
1633                                 else {
1634                                         oldpath = strdup("unknown_user");
1635                                 }
1636                                 size = strlen(oldpath) + SIZ;
1637                                 msg->cm_fields['P'] = malloc(size);
1638                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1639                                         config.c_nodename, oldpath);
1640                                 free(oldpath);
1641
1642                                 /* serialize the message */
1643                                 serialize_message(&sermsg, msg);
1644
1645                                 /* now send it */
1646                                 if (IsEmptyStr(nexthop)) {
1647                                         strcpy(nexthop, msg->cm_fields['D']);
1648                                 }
1649                                 snprintf(filename,
1650                                         sizeof filename,
1651                                         "%s/%s@%lx%x",
1652                                         ctdl_netout_dir,
1653                                         nexthop,
1654                                         time(NULL),
1655                                         rand()
1656                                 );
1657                                 syslog(LOG_DEBUG, "Appending to %s\n", filename);
1658                                 fp = fopen(filename, "ab");
1659                                 if (fp != NULL) {
1660                                         fwrite(sermsg.ser, sermsg.len, 1, fp);
1661                                         fclose(fp);
1662                                 }
1663                                 else {
1664                                         syslog(LOG_ERR, "%s: %s\n", filename, strerror(errno));
1665                                 }
1666                                 free(sermsg.ser);
1667                                 CtdlFreeMessage(msg);
1668                                 return;
1669                         }
1670
1671                         else {  /* invalid destination node name */
1672
1673                                 network_bounce(msg,
1674 "A message you sent could not be delivered due to an invalid destination node"
1675 " name.  Please check the address and try sending the message again.\n");
1676                                 msg = NULL;
1677                                 return;
1678
1679                         }
1680                 }
1681         }
1682
1683         /*
1684          * Check to see if we already have a copy of this message, and
1685          * abort its processing if so.  (We used to post a warning to Aide>
1686          * every time this happened, but the network is now so densely
1687          * connected that it's inevitable.)
1688          */
1689         if (network_usetable(msg) != 0) {
1690                 CtdlFreeMessage(msg);
1691                 return;
1692         }
1693
1694         /* Learn network topology from the path */
1695         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1696                 network_learn_topology(msg->cm_fields['N'], msg->cm_fields['P']);
1697         }
1698
1699         /* Is the sending node giving us a very persuasive suggestion about
1700          * which room this message should be saved in?  If so, go with that.
1701          */
1702         if (msg->cm_fields['C'] != NULL) {
1703                 safestrncpy(target_room, msg->cm_fields['C'], sizeof target_room);
1704         }
1705
1706         /* Otherwise, does it have a recipient?  If so, validate it... */
1707         else if (msg->cm_fields['R'] != NULL) {
1708                 recp = validate_recipients(msg->cm_fields['R'], NULL, 0);
1709                 if (recp != NULL) if (recp->num_error != 0) {
1710                         network_bounce(msg,
1711                                 "A message you sent could not be delivered due to an invalid address.\n"
1712                                 "Please check the address and try sending the message again.\n");
1713                         msg = NULL;
1714                         free_recipients(recp);
1715                         syslog(LOG_DEBUG, "Bouncing message due to invalid recipient address.\n");
1716                         return;
1717                 }
1718                 strcpy(target_room, "");        /* no target room if mail */
1719         }
1720
1721         /* Our last shot at finding a home for this message is to see if
1722          * it has the O field (Originating room) set.
1723          */
1724         else if (msg->cm_fields['O'] != NULL) {
1725                 safestrncpy(target_room, msg->cm_fields['O'], sizeof target_room);
1726         }
1727
1728         /* Strip out fields that are only relevant during transit */
1729         if (msg->cm_fields['D'] != NULL) {
1730                 free(msg->cm_fields['D']);
1731                 msg->cm_fields['D'] = NULL;
1732         }
1733         if (msg->cm_fields['C'] != NULL) {
1734                 free(msg->cm_fields['C']);
1735                 msg->cm_fields['C'] = NULL;
1736         }
1737
1738         /* save the message into a room */
1739         if (PerformNetprocHooks(msg, target_room) == 0) {
1740                 msg->cm_flags = CM_SKIP_HOOKS;
1741                 CtdlSubmitMsg(msg, recp, target_room, 0);
1742         }
1743         CtdlFreeMessage(msg);
1744         free_recipients(recp);
1745 }
1746
1747
1748 /*
1749  * Process a single message from a single file from the inbound queue
1750  */
1751 void network_process_message(FILE *fp, long msgstart, long msgend) {
1752         long hold_pos;
1753         long size;
1754         char *buffer;
1755
1756         hold_pos = ftell(fp);
1757         size = msgend - msgstart + 1;
1758         buffer = malloc(size);
1759         if (buffer != NULL) {
1760                 fseek(fp, msgstart, SEEK_SET);
1761                 if (fread(buffer, size, 1, fp) > 0) {
1762                         network_process_buffer(buffer, size);
1763                 }
1764                 free(buffer);
1765         }
1766
1767         fseek(fp, hold_pos, SEEK_SET);
1768 }
1769
1770
1771 /*
1772  * Process a single file from the inbound queue
1773  */
1774 void network_process_file(char *filename) {
1775         FILE *fp;
1776         long msgstart = (-1L);
1777         long msgend = (-1L);
1778         long msgcur = 0L;
1779         int ch;
1780
1781
1782         fp = fopen(filename, "rb");
1783         if (fp == NULL) {
1784                 syslog(LOG_CRIT, "Error opening %s: %s\n", filename, strerror(errno));
1785                 return;
1786         }
1787
1788         fseek(fp, 0L, SEEK_END);
1789         syslog(LOG_INFO, "network: processing %ld bytes from %s\n", ftell(fp), filename);
1790         rewind(fp);
1791
1792         /* Look for messages in the data stream and break them out */
1793         while (ch = getc(fp), ch >= 0) {
1794
1795                 if (ch == 255) {
1796                         if (msgstart >= 0L) {
1797                                 msgend = msgcur - 1;
1798                                 network_process_message(fp, msgstart, msgend);
1799                         }
1800                         msgstart = msgcur;
1801                 }
1802
1803                 ++msgcur;
1804         }
1805
1806         msgend = msgcur - 1;
1807         if (msgstart >= 0L) {
1808                 network_process_message(fp, msgstart, msgend);
1809         }
1810
1811         fclose(fp);
1812         unlink(filename);
1813 }
1814
1815
1816 /*
1817  * Process anything in the inbound queue
1818  */
1819 void network_do_spoolin(void) {
1820         DIR *dp;
1821         struct dirent *d;
1822         struct stat statbuf;
1823         char filename[PATH_MAX];
1824         static time_t last_spoolin_mtime = 0L;
1825
1826         /*
1827          * Check the spoolin directory's modification time.  If it hasn't
1828          * been touched, we don't need to scan it.
1829          */
1830         if (stat(ctdl_netin_dir, &statbuf)) return;
1831         if (statbuf.st_mtime == last_spoolin_mtime) {
1832                 syslog(LOG_DEBUG, "network: nothing in inbound queue\n");
1833                 return;
1834         }
1835         last_spoolin_mtime = statbuf.st_mtime;
1836         syslog(LOG_DEBUG, "network: processing inbound queue\n");
1837
1838         /*
1839          * Ok, there's something interesting in there, so scan it.
1840          */
1841         dp = opendir(ctdl_netin_dir);
1842         if (dp == NULL) return;
1843
1844         while (d = readdir(dp), d != NULL) {
1845                 if ((strcmp(d->d_name, ".")) && (strcmp(d->d_name, ".."))) {
1846                         snprintf(filename,
1847                                 sizeof filename,
1848                                 "%s/%s",
1849                                 ctdl_netin_dir,
1850                                 d->d_name
1851                         );
1852                         network_process_file(filename);
1853                 }
1854         }
1855
1856         closedir(dp);
1857 }
1858
1859 /*
1860  * Step 1: consolidate files in the outbound queue into one file per neighbor node
1861  * Step 2: delete any files in the outbound queue that were for neighbors who no longer exist.
1862  */
1863 void network_consolidate_spoolout(void) {
1864         DIR *dp;
1865         struct dirent *d;
1866         char filename[PATH_MAX];
1867         char cmd[PATH_MAX];
1868         char nexthop[256];
1869         int i;
1870         char *ptr;
1871
1872         /* Step 1: consolidate files in the outbound queue into one file per neighbor node */
1873         dp = opendir(ctdl_netout_dir);
1874         if (dp == NULL) return;
1875         while (d = readdir(dp), d != NULL) {
1876                 if (
1877                         (strcmp(d->d_name, "."))
1878                         && (strcmp(d->d_name, ".."))
1879                         && (strchr(d->d_name, '@') != NULL)
1880                 ) {
1881                         safestrncpy(nexthop, d->d_name, sizeof nexthop);
1882                         ptr = strchr(nexthop, '@');
1883                         if (ptr) *ptr = 0;
1884
1885                         snprintf(filename,
1886                                 sizeof filename,
1887                                 "%s/%s",
1888                                 ctdl_netout_dir,
1889                                 d->d_name
1890                         );
1891
1892                         syslog(LOG_DEBUG, "Consolidate %s to %s\n", filename, nexthop);
1893                         if (network_talking_to(nexthop, NTT_CHECK)) {
1894                                 syslog(LOG_DEBUG,
1895                                         "Currently online with %s - skipping for now\n",
1896                                         nexthop
1897                                 );
1898                         }
1899                         else {
1900                                 network_talking_to(nexthop, NTT_ADD);
1901                                 snprintf(cmd, sizeof cmd, "/bin/cat %s >>%s/%s && /bin/rm -f %s",
1902                                         filename,
1903                                         ctdl_netout_dir, nexthop,
1904                                         filename
1905                                 );
1906                                 system(cmd);
1907                                 network_talking_to(nexthop, NTT_REMOVE);
1908                         }
1909                 }
1910         }
1911         closedir(dp);
1912
1913         /* Step 2: delete any files in the outbound queue that were for neighbors who no longer exist */
1914
1915         dp = opendir(ctdl_netout_dir);
1916         if (dp == NULL) return;
1917
1918         while (d = readdir(dp), d != NULL) {
1919                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
1920                         continue;
1921                 ptr = strchr(d->d_name, '@');
1922                 if (d != NULL)
1923                         continue;
1924                 snprintf(filename,
1925                         sizeof filename,
1926                         "%s/%s",
1927                         ctdl_netout_dir,
1928                         d->d_name
1929                 );
1930
1931                 strcpy(nexthop, "");
1932                 i = is_valid_node(nexthop, NULL, d->d_name);
1933
1934                 if ( (i != 0) || !IsEmptyStr(nexthop) ) {
1935                         unlink(filename);
1936                 }
1937         }
1938
1939
1940         closedir(dp);
1941 }
1942
1943
1944 /*
1945  * receive network spool from the remote system
1946  */
1947 void receive_spool(int *sock, char *remote_nodename) {
1948         int download_len = 0L;
1949         int bytes_received = 0L;
1950         char buf[SIZ];
1951         char tempfilename[PATH_MAX];
1952         char permfilename[PATH_MAX];
1953         int plen;
1954         FILE *fp;
1955
1956         snprintf(tempfilename,
1957                 sizeof tempfilename,
1958                 "%s/%s.%lx%x",
1959                 ctdl_nettmp_dir,
1960                 remote_nodename,
1961                 time(NULL),
1962                 rand()
1963         );
1964
1965         snprintf(permfilename,
1966                 sizeof permfilename,
1967                 "%s/%s.%lx%x",
1968                 ctdl_netin_dir,
1969                 remote_nodename,
1970                 time(NULL),
1971                 rand()
1972         );
1973
1974         if (sock_puts(sock, "NDOP") < 0) return;
1975         if (sock_getln(sock, buf, sizeof buf) < 0) return;
1976         syslog(LOG_DEBUG, "<%s\n", buf);
1977         if (buf[0] != '2') {
1978                 return;
1979         }
1980
1981         download_len = extract_long(&buf[4], 0);
1982         if (download_len <= 0) {
1983                 return;
1984         }
1985
1986         bytes_received = 0L;
1987         fp = fopen(tempfilename, "w");
1988         if (fp == NULL) {
1989                 syslog(LOG_CRIT, "Cannot create %s: %s\n", tempfilename, strerror(errno));
1990                 return;
1991         }
1992
1993         syslog(LOG_DEBUG, "Expecting to transfer %d bytes\n", download_len);
1994         while (bytes_received < download_len) {
1995                 /*
1996                  * If shutting down we can exit here and unlink the temp file.
1997                  * this shouldn't loose us any messages.
1998                  */
1999                 if (server_shutting_down)
2000                 {
2001                         fclose(fp);
2002                         unlink(tempfilename);
2003                         return;
2004                 }
2005                 snprintf(buf, sizeof buf, "READ %d|%d",
2006                          bytes_received,
2007                          ((download_len - bytes_received > IGNET_PACKET_SIZE)
2008                           ? IGNET_PACKET_SIZE : (download_len - bytes_received))
2009                 );
2010
2011                 if (sock_puts(sock, buf) < 0) {
2012                         fclose(fp);
2013                         unlink(tempfilename);
2014                         return;
2015                 }
2016                 if (sock_getln(sock, buf, sizeof buf) < 0) {
2017                         fclose(fp);
2018                         unlink(tempfilename);
2019                         return;
2020                 }
2021
2022                 if (buf[0] == '6') {
2023                         plen = extract_int(&buf[4], 0);
2024                         StrBuf *pbuf = NewStrBuf();
2025                         if (socket_read_blob(sock, pbuf, plen, CLIENT_TIMEOUT) != plen) {
2026                                 syslog(LOG_INFO, "Short read from peer; aborting.\n");
2027                                 fclose(fp);
2028                                 unlink(tempfilename);
2029                                 FreeStrBuf(&pbuf);
2030                                 return;
2031                         }
2032                         fwrite(ChrPtr(pbuf), plen, 1, fp);
2033                         bytes_received += plen;
2034                         FreeStrBuf(&pbuf);
2035                 }
2036         }
2037
2038         fclose(fp);
2039
2040         /* Last chance for shutdown exit */
2041         if (server_shutting_down)
2042         {
2043                 unlink(tempfilename);
2044                 return;
2045         }
2046
2047         if (sock_puts(sock, "CLOS") < 0) {
2048                 unlink(tempfilename);
2049                 return;
2050         }
2051
2052         /*
2053          * From here on we must complete or messages will get lost
2054          */
2055         if (sock_getln(sock, buf, sizeof buf) < 0) {
2056                 unlink(tempfilename);
2057                 return;
2058         }
2059
2060         syslog(LOG_DEBUG, "%s\n", buf);
2061
2062         /*
2063          * Now move the temp file to its permanent location.
2064          */
2065         if (link(tempfilename, permfilename) != 0) {
2066                 syslog(LOG_ALERT, "Could not link %s to %s: %s\n",
2067                         tempfilename, permfilename, strerror(errno)
2068                 );
2069         }
2070
2071         unlink(tempfilename);
2072 }
2073
2074
2075
2076 /*
2077  * transmit network spool to the remote system
2078  */
2079 void transmit_spool(int *sock, char *remote_nodename)
2080 {
2081         char buf[SIZ];
2082         char pbuf[4096];
2083         long plen;
2084         long bytes_to_write, thisblock, bytes_written;
2085         int fd;
2086         char sfname[128];
2087
2088         if (sock_puts(sock, "NUOP") < 0) return;
2089         if (sock_getln(sock, buf, sizeof buf) < 0) return;
2090         syslog(LOG_DEBUG, "<%s\n", buf);
2091         if (buf[0] != '2') {
2092                 return;
2093         }
2094
2095         snprintf(sfname, sizeof sfname,
2096                 "%s/%s",
2097                 ctdl_netout_dir,
2098                 remote_nodename
2099         );
2100         fd = open(sfname, O_RDONLY);
2101         if (fd < 0) {
2102                 if (errno != ENOENT) {
2103                         syslog(LOG_CRIT, "cannot open %s: %s\n", sfname, strerror(errno));
2104                 }
2105                 return;
2106         }
2107         bytes_written = 0;
2108         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
2109                 bytes_to_write = plen;
2110                 while (bytes_to_write > 0L) {
2111                         /* Exit if shutting down */
2112                         if (server_shutting_down)
2113                         {
2114                                 close(fd);
2115                                 return;
2116                         }
2117
2118                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
2119                         if (sock_puts(sock, buf) < 0) {
2120                                 close(fd);
2121                                 return;
2122                         }
2123                         if (sock_getln(sock, buf, sizeof buf) < 0) {
2124                                 close(fd);
2125                                 return;
2126                         }
2127                         thisblock = atol(&buf[4]);
2128                         if (buf[0] == '7') {
2129                                 if (sock_write(sock, pbuf, (int) thisblock) < 0) {
2130                                         close(fd);
2131                                         return;
2132                                 }
2133                                 bytes_to_write -= thisblock;
2134                                 bytes_written += thisblock;
2135                         } else {
2136                                 goto ABORTUPL;
2137                         }
2138                 }
2139         }
2140
2141 ABORTUPL:
2142         close(fd);
2143
2144         /* Last chance for shutdown exit */
2145         if(server_shutting_down)
2146                 return;
2147
2148         if (sock_puts(sock, "UCLS 1") < 0) return;
2149
2150         /*
2151          * From here on we must complete or messages will get lost
2152          */
2153         if (sock_getln(sock, buf, sizeof buf) < 0) return;
2154         syslog(LOG_NOTICE, "Sent %ld octets to <%s>\n", bytes_written, remote_nodename);
2155         syslog(LOG_DEBUG, "<%s\n", buf);
2156         if (buf[0] == '2') {
2157                 syslog(LOG_DEBUG, "Removing <%s>\n", sfname);
2158                 unlink(sfname);
2159         }
2160 }
2161
2162
2163
2164 /*
2165  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
2166  */
2167 void network_poll_node(char *node, char *secret, char *host, char *port) {
2168         int sock;
2169         char buf[SIZ];
2170         char err_buf[SIZ];
2171         char connected_to[SIZ];
2172         CitContext *CCC=CC;
2173
2174         if (network_talking_to(node, NTT_CHECK)) return;
2175         network_talking_to(node, NTT_ADD);
2176         syslog(LOG_DEBUG, "network: polling <%s>\n", node);
2177         syslog(LOG_NOTICE, "Connecting to <%s> at %s:%s\n", node, host, port);
2178
2179         sock = sock_connect(host, port);
2180         if (sock < 0) {
2181                 syslog(LOG_ERR, "Could not connect: %s\n", strerror(errno));
2182                 network_talking_to(node, NTT_REMOVE);
2183                 return;
2184         }
2185
2186         syslog(LOG_DEBUG, "Connected!\n");
2187         CCC->sReadBuf = NewStrBuf();
2188         CCC->sMigrateBuf = NewStrBuf();
2189         CCC->sPos = NULL;
2190
2191         /* Read the server greeting */
2192         if (sock_getln(&sock, buf, sizeof buf) < 0) goto bail;
2193         syslog(LOG_DEBUG, ">%s\n", buf);
2194
2195         /* Check that the remote is who we think it is and warn the Aide if not */
2196         extract_token (connected_to, buf, 1, ' ', sizeof connected_to);
2197         if (strcmp(connected_to, node))
2198         {
2199                 snprintf(err_buf, sizeof(err_buf),
2200                         "Connected to node \"%s\" but I was expecting to connect to node \"%s\".",
2201                         connected_to, node
2202                 );
2203                 syslog(LOG_ERR, "%s\n", err_buf);
2204                 CtdlAideMessage(err_buf, "Network error");
2205         }
2206         else {
2207                 /* We're talking to the correct node.  Now identify ourselves. */
2208                 snprintf(buf, sizeof buf, "NETP %s|%s", config.c_nodename, secret);
2209                 syslog(LOG_DEBUG, "<%s\n", buf);
2210                 if (sock_puts(&sock, buf) <0) goto bail;
2211                 if (sock_getln(&sock, buf, sizeof buf) < 0) goto bail;
2212                 syslog(LOG_DEBUG, ">%s\n", buf);
2213                 if (buf[0] != '2') {
2214                         goto bail;
2215                 }
2216
2217                 /* At this point we are authenticated. */
2218                 if (!server_shutting_down)
2219                         receive_spool(&sock, node);
2220                 if (!server_shutting_down)
2221                         transmit_spool(&sock, node);
2222         }
2223
2224         sock_puts(&sock, "QUIT");
2225 bail:
2226         FreeStrBuf(&CCC->sReadBuf);
2227         FreeStrBuf(&CCC->sMigrateBuf);
2228         if (sock != -1)
2229                 sock_close(sock);
2230         network_talking_to(node, NTT_REMOVE);
2231 }
2232
2233
2234
2235 /*
2236  * Poll other Citadel nodes and transfer inbound/outbound network data.
2237  * Set "full" to nonzero to force a poll of every node, or to zero to poll
2238  * only nodes to which we have data to send.
2239  */
2240 void network_poll_other_citadel_nodes(int full_poll) {
2241         int i;
2242         char linebuf[256];
2243         char node[SIZ];
2244         char host[256];
2245         char port[256];
2246         char secret[256];
2247         int poll = 0;
2248         char spoolfile[256];
2249
2250         if (working_ignetcfg == NULL) {
2251                 syslog(LOG_DEBUG, "network: no neighbor nodes are configured - not polling.\n");
2252                 return;
2253         }
2254
2255         /* Use the string tokenizer to grab one line at a time */
2256         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
2257                 if(server_shutting_down)
2258                         return;
2259                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
2260                 extract_token(node, linebuf, 0, '|', sizeof node);
2261                 extract_token(secret, linebuf, 1, '|', sizeof secret);
2262                 extract_token(host, linebuf, 2, '|', sizeof host);
2263                 extract_token(port, linebuf, 3, '|', sizeof port);
2264                 if ( !IsEmptyStr(node) && !IsEmptyStr(secret)
2265                    && !IsEmptyStr(host) && !IsEmptyStr(port)) {
2266                         poll = full_poll;
2267                         if (poll == 0) {
2268                                 snprintf(spoolfile,
2269                                          sizeof spoolfile,
2270                                          "%s/%s",
2271                                          ctdl_netout_dir,
2272                                          node
2273                                 );
2274                                 if (access(spoolfile, R_OK) == 0) {
2275                                         poll = 1;
2276                                 }
2277                         }
2278                         if (poll) {
2279                                 network_poll_node(node, secret, host, port);
2280                         }
2281                 }
2282         }
2283
2284 }
2285
2286
2287
2288
2289 /*
2290  * It's ok if these directories already exist.  Just fail silently.
2291  */
2292 void create_spool_dirs(void) {
2293         if ((mkdir(ctdl_spool_dir, 0700) != 0) && (errno != EEXIST))
2294                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_spool_dir, strerror(errno));
2295         if (chown(ctdl_spool_dir, CTDLUID, (-1)) != 0)
2296                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_spool_dir, strerror(errno));
2297         if ((mkdir(ctdl_netin_dir, 0700) != 0) && (errno != EEXIST))
2298                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_netin_dir, strerror(errno));
2299         if (chown(ctdl_netin_dir, CTDLUID, (-1)) != 0)
2300                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netin_dir, strerror(errno));
2301         if ((mkdir(ctdl_nettmp_dir, 0700) != 0) && (errno != EEXIST))
2302                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_nettmp_dir, strerror(errno));
2303         if (chown(ctdl_nettmp_dir, CTDLUID, (-1)) != 0)
2304                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_nettmp_dir, strerror(errno));
2305         if ((mkdir(ctdl_netout_dir, 0700) != 0) && (errno != EEXIST))
2306                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_netout_dir, strerror(errno));
2307         if (chown(ctdl_netout_dir, CTDLUID, (-1)) != 0)
2308                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netout_dir, strerror(errno));
2309 }
2310
2311
2312
2313
2314
2315 /*
2316  * network_do_queue()
2317  *
2318  * Run through the rooms doing various types of network stuff.
2319  */
2320 void network_do_queue(void) {
2321         static int doing_queue = 0;
2322         static time_t last_run = 0L;
2323         struct RoomProcList *ptr;
2324         int full_processing = 1;
2325
2326         /*
2327          * Run the full set of processing tasks no more frequently
2328          * than once every n seconds
2329          */
2330         if ( (time(NULL) - last_run) < config.c_net_freq ) {
2331                 full_processing = 0;
2332                 syslog(LOG_DEBUG, "Network full processing in %ld seconds.\n",
2333                         config.c_net_freq - (time(NULL)- last_run)
2334                 );
2335         }
2336
2337         /*
2338          * This is a simple concurrency check to make sure only one queue run
2339          * is done at a time.  We could do this with a mutex, but since we
2340          * don't really require extremely fine granularity here, we'll do it
2341          * with a static variable instead.
2342          */
2343         if (doing_queue) {
2344                 return;
2345         }
2346         doing_queue = 1;
2347
2348         /* Load the IGnet Configuration into memory */
2349         load_working_ignetcfg();
2350
2351         /*
2352          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
2353          * then we poll everyone.  Otherwise we only poll nodes we have stuff
2354          * to send to.
2355          */
2356         network_poll_other_citadel_nodes(full_processing);
2357
2358         /*
2359          * Load the network map and filter list into memory.
2360          */
2361         read_network_map();
2362         filterlist = load_filter_list();
2363
2364         /*
2365          * Go ahead and run the queue
2366          */
2367         if (full_processing && !server_shutting_down) {
2368                 syslog(LOG_DEBUG, "network: loading outbound queue\n");
2369                 CtdlForEachRoom(network_queue_room, NULL);
2370         }
2371
2372         if (rplist != NULL) {
2373                 syslog(LOG_DEBUG, "network: running outbound queue\n");
2374                 while (rplist != NULL && !server_shutting_down) {
2375                         char spoolroomname[ROOMNAMELEN];
2376                         safestrncpy(spoolroomname, rplist->name, sizeof spoolroomname);
2377                         begin_critical_section(S_RPLIST);
2378
2379                         /* pop this record off the list */
2380                         ptr = rplist;
2381                         rplist = rplist->next;
2382                         free(ptr);
2383
2384                         /* invalidate any duplicate entries to prevent double processing */
2385                         for (ptr=rplist; ptr!=NULL; ptr=ptr->next) {
2386                                 if (!strcasecmp(ptr->name, spoolroomname)) {
2387                                         ptr->name[0] = 0;
2388                                 }
2389                         }
2390
2391                         end_critical_section(S_RPLIST);
2392                         if (spoolroomname[0] != 0) {
2393                                 network_spoolout_room(spoolroomname);
2394                         }
2395                 }
2396         }
2397
2398         /* If there is anything in the inbound queue, process it */
2399         if (!server_shutting_down) {
2400                 network_do_spoolin();
2401         }
2402
2403         /* Save the network map back to disk */
2404         write_network_map();
2405
2406         /* Free the filter list in memory */
2407         free_filter_list(filterlist);
2408         filterlist = NULL;
2409
2410         network_consolidate_spoolout();
2411
2412         syslog(LOG_DEBUG, "network: queue run completed\n");
2413
2414         if (full_processing) {
2415                 last_run = time(NULL);
2416         }
2417
2418         doing_queue = 0;
2419 }
2420
2421
2422 /*
2423  * cmd_netp() - authenticate to the server as another Citadel node polling
2424  *            for network traffic
2425  */
2426 void cmd_netp(char *cmdbuf)
2427 {
2428         char node[256];
2429         char pass[256];
2430         int v;
2431
2432         char secret[256];
2433         char nexthop[256];
2434         char err_buf[SIZ];
2435
2436         /* Authenticate */
2437         extract_token(node, cmdbuf, 0, '|', sizeof node);
2438         extract_token(pass, cmdbuf, 1, '|', sizeof pass);
2439
2440         /* load the IGnet Configuration to check node validity */
2441         load_working_ignetcfg();
2442         v = is_valid_node(nexthop, secret, node);
2443
2444         if (v != 0) {
2445                 snprintf(err_buf, sizeof err_buf,
2446                         "An unknown Citadel server called \"%s\" attempted to connect from %s [%s].\n",
2447                         node, CC->cs_host, CC->cs_addr
2448                 );
2449                 syslog(LOG_WARNING, "%s", err_buf);
2450                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2451                 CtdlAideMessage(err_buf, "IGNet Networking.");
2452                 return;
2453         }
2454
2455         if (strcasecmp(pass, secret)) {
2456                 snprintf(err_buf, sizeof err_buf,
2457                         "A Citadel server at %s [%s] failed to authenticate as network node \"%s\".\n",
2458                         CC->cs_host, CC->cs_addr, node
2459                 );
2460                 syslog(LOG_WARNING, "%s", err_buf);
2461                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2462                 CtdlAideMessage(err_buf, "IGNet Networking.");
2463                 return;
2464         }
2465
2466         if (network_talking_to(node, NTT_CHECK)) {
2467                 syslog(LOG_WARNING, "Duplicate session for network node <%s>", node);
2468                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
2469                 return;
2470         }
2471
2472         safestrncpy(CC->net_node, node, sizeof CC->net_node);
2473         network_talking_to(node, NTT_ADD);
2474         syslog(LOG_NOTICE, "Network node <%s> logged in from %s [%s]\n",
2475                 CC->net_node, CC->cs_host, CC->cs_addr
2476         );
2477         cprintf("%d authenticated as network node '%s'\n", CIT_OK, CC->net_node);
2478 }
2479
2480
2481 int network_room_handler (struct ctdlroom *room)
2482 {
2483         network_queue_room(room, NULL);
2484         return 0;
2485 }
2486
2487
2488 /*
2489  * Module entry point
2490  */
2491 CTDL_MODULE_INIT(network)
2492 {
2493         if (!threading)
2494         {
2495                 create_spool_dirs();
2496                 CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
2497                 CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
2498                 CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
2499                 CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
2500                 CtdlRegisterRoomHook(network_room_handler);
2501                 CtdlRegisterCleanupHook(destroy_network_queue_room);
2502                 CtdlRegisterSessionHook(network_do_queue, EVT_TIMER);
2503         }
2504         return "network";
2505 }