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         size_t siz;
 498         struct recptypes *valid;
 499         namelist *nptr;
 500         char bounce_to[256];
 501
 502         if (sc->num_msgs_spooled < 1) {
 503                 fclose(sc->digestfp);
 504                 sc->digestfp = NULL;
 505                 return;
 506         }
 507
 508         msg = malloc(sizeof(struct CtdlMessage));
 509         memset(msg, 0, sizeof(struct CtdlMessage));
 510         msg->cm_magic = CTDLMESSAGE_MAGIC;
 511         msg->cm_format_type = FMT_RFC822;
 512         msg->cm_anon_type = MES_NORMAL;
 513
 514         sprintf(buf, "%ld", time(NULL));
 515         msg->cm_fields['T'] = strdup(buf);
 516         msg->cm_fields['A'] = strdup(CC->room.QRname);
 517         snprintf(buf, sizeof buf, "[%s]", CC->room.QRname);
 518         msg->cm_fields['U'] = strdup(buf);
 519         sprintf(buf, "room_%s@%s", CC->room.QRname, config.c_fqdn);
 520         for (i=0; buf[i]; ++i) {
 521                 if (isspace(buf[i])) buf[i]='_';
 522                 buf[i] = tolower(buf[i]);
 523         }
 524         msg->cm_fields['F'] = strdup(buf);
 525         msg->cm_fields['R'] = strdup(buf);
 526
 527         /* Set the 'List-ID' header */
 528         msg->cm_fields['L'] = malloc(1024);
 529         snprintf(msg->cm_fields['L'], 1024,
 530                 "%s <%ld.list-id.%s>",
 531                 CC->room.QRname,
 532                 CC->room.QRnumber,
 533                 config.c_fqdn
 534         );
 535
 536         /*
 537          * Go fetch the contents of the digest
 538          */
 539         fseek(sc->digestfp, 0L, SEEK_END);
 540         msglen = ftell(sc->digestfp);
 541
 542         msg->cm_fields['M'] = malloc(msglen + 1);
 543         fseek(sc->digestfp, 0L, SEEK_SET);
 544         siz = fread(msg->cm_fields['M'], (size_t)msglen, 1, sc->digestfp);
 545         msg->cm_fields['M'][msglen] = '\0';
 546
 547         fclose(sc->digestfp);
 548         sc->digestfp = NULL;
 549
 550         /* Now generate the delivery instructions */
 551
 552         /*
 553          * Figure out how big a buffer we need to allocate
 554          */
 555         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 556                 recps_len = recps_len + strlen(nptr->name) + 2;
 557         }
 558
 559         recps = malloc(recps_len);
 560
 561         if (recps == NULL) {
 562                 syslog(LOG_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 563                 abort();
 564         }
 565
 566         strcpy(recps, "");
 567
 568         /* Each recipient */
 569         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 570                 if (nptr != sc->digestrecps) {
 571                         strcat(recps, ",");
 572                 }
 573                 strcat(recps, nptr->name);
 574         }
 575
 576         /* Where do we want bounces and other noise to be heard?  Surely not the list members! */
 577         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 578
 579         /* Now submit the message */
 580         valid = validate_recipients(recps, NULL, 0);
 581         free(recps);
 582         if (valid != NULL) {
 583                 valid->bounce_to = strdup(bounce_to);
 584                 valid->envelope_from = strdup(bounce_to);
 585                 CtdlSubmitMsg(msg, valid, NULL, 0);
 586         }
 587         CtdlFreeMessage(msg);
 588         free_recipients(valid);
 589 }
 590
 591
 592 /*
 593  * Deliver list messages to everyone on the list ... efficiently
 594  */
 595 void network_deliver_list(struct CtdlMessage *msg, SpoolControl *sc) {
 596         char *recps = NULL;
 597         size_t recps_len = SIZ;
 598         struct recptypes *valid;
 599         namelist *nptr;
 600         char bounce_to[256];
 601
 602         /* Don't do this if there were no recipients! */
 603         if (sc->listrecps == NULL) return;
 604
 605         /* Now generate the delivery instructions */
 606
 607         /*
 608          * Figure out how big a buffer we need to allocate
 609          */
 610         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 611                 recps_len = recps_len + strlen(nptr->name) + 2;
 612         }
 613
 614         recps = malloc(recps_len);
 615
 616         if (recps == NULL) {
 617                 syslog(LOG_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 618                 abort();
 619         }
 620
 621         strcpy(recps, "");
 622
 623         /* Each recipient */
 624         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 625                 if (nptr != sc->listrecps) {
 626                         strcat(recps, ",");
 627                 }
 628                 strcat(recps, nptr->name);
 629         }
 630
 631         /* Where do we want bounces and other noise to be heard?  Surely not the list members! */
 632         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 633
 634         /* Now submit the message */
 635         valid = validate_recipients(recps, NULL, 0);
 636         free(recps);
 637         if (valid != NULL) {
 638                 valid->bounce_to = strdup(bounce_to);
 639                 valid->envelope_from = strdup(bounce_to);
 640                 CtdlSubmitMsg(msg, valid, NULL, 0);
 641                 free_recipients(valid);
 642         }
 643         /* Do not call CtdlFreeMessage(msg) here; the caller will free it. */
 644 }
 645
 646
 647
 648
 649 /*
 650  * Spools out one message from the list.
 651  */
 652 void network_spool_msg(long msgnum, void *userdata) {
 653         SpoolControl *sc;
 654         int i;
 655         char *newpath = NULL;
 656         size_t instr_len = SIZ;
 657         struct CtdlMessage *msg = NULL;
 658         namelist *nptr;
 659         maplist *mptr;
 660         struct ser_ret sermsg;
 661         FILE *fp;
 662         char filename[PATH_MAX];
 663         char buf[SIZ];
 664         int bang = 0;
 665         int send = 1;
 666         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 667         int ok_to_participate = 0;
 668         struct recptypes *valid;
 669
 670         sc = (SpoolControl *)userdata;
 671
 672         /*
 673          * Process mailing list recipients
 674          */
 675         instr_len = SIZ;
 676         if (sc->listrecps != NULL) {
 677                 /* Fetch the message.  We're going to need to modify it
 678                  * in order to insert the [list name] in it, etc.
 679                  */
 680                 msg = CtdlFetchMessage(msgnum, 1);
 681                 if (msg != NULL) {
 682                         int rlen;
 683                         char *pCh;
 684                         StrBuf *Subject, *FlatSubject;
 685
 686                         if (msg->cm_fields['V'] == NULL){
 687                                 /* local message, no enVelope */
 688                                 StrBuf *Buf;
 689                                 Buf = NewStrBuf();
 690                                 StrBufAppendBufPlain(Buf, msg->cm_fields['O'], -1, 0);
 691                                 StrBufAppendBufPlain(Buf, HKEY("@"), 0);
 692                                 StrBufAppendBufPlain(Buf, config.c_fqdn, -1, 0);
 693
 694                                 msg->cm_fields['K'] = SmashStrBuf(&Buf);
 695                         }
 696                         else {
 697                                 msg->cm_fields['K'] = strdup (msg->cm_fields['V']);
 698                         }
 699                         /* Set the 'List-ID' header */
 700                         if (msg->cm_fields['L'] != NULL) {
 701                                 free(msg->cm_fields['L']);
 702                         }
 703                         msg->cm_fields['L'] = malloc(1024);
 704                         snprintf(msg->cm_fields['L'], 1024,
 705                                 "%s <%ld.list-id.%s>",
 706                                 CC->room.QRname,
 707                                 CC->room.QRnumber,
 708                                 config.c_fqdn
 709                         );
 710
 711                         /* Prepend "[List name]" to the subject */
 712                         if (msg->cm_fields['U'] == NULL) {
 713                                 Subject = NewStrBufPlain(HKEY("(no subject)"));
 714                         }
 715                         else {
 716                                 Subject = NewStrBufPlain(msg->cm_fields['U'], -1);
 717                         }
 718                         FlatSubject = NewStrBufPlain(NULL, StrLength(Subject));
 719                         StrBuf_RFC822_to_Utf8(FlatSubject, Subject, NULL, NULL);
 720
 721                         rlen = strlen(CC->room.QRname);
 722                         pCh  = strstr(ChrPtr(FlatSubject), CC->room.QRname);
 723                         if ((pCh == NULL) ||
 724                             (*(pCh + rlen) != ']') ||
 725                             (pCh == ChrPtr(FlatSubject)) ||
 726                             (*(pCh - 1) != '[')
 727                                 )
 728                         {
 729                                 StrBuf *tmp;
 730                                 StrBufPlain(Subject, HKEY("["));
 731                                 StrBufAppendBufPlain(Subject, CC->room.QRname, rlen, 0);
 732                                 StrBufAppendBufPlain(Subject, HKEY("] "), 0);
 733                                 StrBufAppendBuf(Subject, FlatSubject, 0);
 734                                 tmp = Subject;  Subject = FlatSubject;  FlatSubject = tmp; /* so we can free the right one... */
 735                                 StrBufRFC2047encode(&Subject, FlatSubject);
 736                         }
 737
 738                         if (msg->cm_fields['U'] != NULL)
 739                                 free (msg->cm_fields['U']);
 740                         msg->cm_fields['U'] = SmashStrBuf(&Subject);
 741
 742                         FreeStrBuf(&FlatSubject);
 743
 744                         /* else we won't modify the buffer, since the roomname is already here. */
 745
 746                         /* Set the recipient of the list message to the
 747                          * email address of the room itself.
 748                          * FIXME ... I want to be able to pick any address
 749                          */
 750                         if (msg->cm_fields['R'] != NULL) {
 751                                 free(msg->cm_fields['R']);
 752                         }
 753                         msg->cm_fields['R'] = malloc(256);
 754                         snprintf(msg->cm_fields['R'], 256,
 755                                 "room_%s@%s", CC->room.QRname,
 756                                 config.c_fqdn);
 757                         for (i=0; msg->cm_fields['R'][i]; ++i) {
 758                                 if (isspace(msg->cm_fields['R'][i])) {
 759                                         msg->cm_fields['R'][i] = '_';
 760                                 }
 761                         }
 762
 763                         /* Handle delivery */
 764                         network_deliver_list(msg, sc);
 765                         CtdlFreeMessage(msg);
 766                 }
 767         }
 768
 769         /*
 770          * Process digest recipients
 771          */
 772         if ((sc->digestrecps != NULL) && (sc->digestfp != NULL)) {
 773                 msg = CtdlFetchMessage(msgnum, 1);
 774                 if (msg != NULL) {
 775                         fprintf(sc->digestfp,   " -----------------------------------"
 776                                                 "------------------------------------"
 777                                                 "-------\n");
 778                         fprintf(sc->digestfp, "From: ");
 779                         if (msg->cm_fields['A'] != NULL) {
 780                                 fprintf(sc->digestfp, "%s ", msg->cm_fields['A']);
 781                         }
 782                         if (msg->cm_fields['F'] != NULL) {
 783                                 fprintf(sc->digestfp, "<%s> ", msg->cm_fields['F']);
 784                         }
 785                         else if (msg->cm_fields['N'] != NULL) {
 786                                 fprintf(sc->digestfp, "@%s ", msg->cm_fields['N']);
 787                         }
 788                         fprintf(sc->digestfp, "\n");
 789                         if (msg->cm_fields['U'] != NULL) {
 790                                 fprintf(sc->digestfp, "Subject: %s\n", msg->cm_fields['U']);
 791                         }
 792
 793                         CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 794
 795                         safestrncpy(CC->preferred_formats, "text/plain", sizeof CC->preferred_formats);
 796                         CtdlOutputPreLoadedMsg(msg, MT_CITADEL, HEADERS_NONE, 0, 0, 0);
 797
 798                         StrBufTrim(CC->redirect_buffer);
 799                         fwrite(HKEY("\n"), 1, sc->digestfp);
 800                         fwrite(SKEY(CC->redirect_buffer), 1, sc->digestfp);
 801                         fwrite(HKEY("\n"), 1, sc->digestfp);
 802
 803                         FreeStrBuf(&CC->redirect_buffer);
 804
 805                         sc->num_msgs_spooled += 1;
 806                         free(msg);
 807                 }
 808         }
 809
 810         /*
 811          * Process client-side list participations for this room
 812          */
 813         instr_len = SIZ;
 814         if (sc->participates != NULL) {
 815                 msg = CtdlFetchMessage(msgnum, 1);
 816                 if (msg != NULL) {
 817
 818                         /* Only send messages which originated on our own Citadel
 819                          * network, otherwise we'll end up sending the remote
 820                          * mailing list's messages back to it, which is rude...
 821                          */
 822                         ok_to_participate = 0;
 823                         if (msg->cm_fields['N'] != NULL) {
 824                                 if (!strcasecmp(msg->cm_fields['N'], config.c_nodename)) {
 825                                         ok_to_participate = 1;
 826                                 }
 827                                 if (is_valid_node(NULL, NULL, msg->cm_fields['N']) == 0) {
 828                                         ok_to_participate = 1;
 829                                 }
 830                         }
 831                         if (ok_to_participate) {
 832                                 if (msg->cm_fields['F'] != NULL) {
 833                                         free(msg->cm_fields['F']);
 834                                 }
 835                                 msg->cm_fields['F'] = malloc(SIZ);
 836                                 /* Replace the Internet email address of the actual
 837                                 * author with the email address of the room itself,
 838                                 * so the remote listserv doesn't reject us.
 839                                 * FIXME ... I want to be able to pick any address
 840                                 */
 841                                 snprintf(msg->cm_fields['F'], SIZ,
 842                                         "room_%s@%s", CC->room.QRname,
 843                                         config.c_fqdn);
 844                                 for (i=0; msg->cm_fields['F'][i]; ++i) {
 845                                         if (isspace(msg->cm_fields['F'][i])) {
 846                                                 msg->cm_fields['F'][i] = '_';
 847                                         }
 848                                 }
 849
 850                                 /*
 851                                  * Figure out how big a buffer we need to allocate
 852                                  */
 853                                 for (nptr = sc->participates; nptr != NULL; nptr = nptr->next) {
 854
 855                                         if (msg->cm_fields['R'] == NULL) {
 856                                                 free(msg->cm_fields['R']);
 857                                         }
 858                                         msg->cm_fields['R'] = strdup(nptr->name);
 859
 860                                         valid = validate_recipients(nptr->name, NULL, 0);
 861                                         CtdlSubmitMsg(msg, valid, "", 0);
 862                                         free_recipients(valid);
 863                                 }
 864
 865                         }
 866                         CtdlFreeMessage(msg);
 867                 }
 868         }
 869
 870         /*
 871          * Process IGnet push shares
 872          */
 873         msg = CtdlFetchMessage(msgnum, 1);
 874         if (msg != NULL) {
 875                 size_t newpath_len;
 876
 877                 /* Prepend our node name to the Path field whenever
 878                  * sending a message to another IGnet node
 879                  */
 880                 if (msg->cm_fields['P'] == NULL) {
 881                         msg->cm_fields['P'] = strdup("username");
 882                 }
 883                 newpath_len = strlen(msg->cm_fields['P']) +
 884                          strlen(config.c_nodename) + 2;
 885                 newpath = malloc(newpath_len);
 886                 snprintf(newpath, newpath_len, "%s!%s",
 887                          config.c_nodename, msg->cm_fields['P']);
 888                 free(msg->cm_fields['P']);
 889                 msg->cm_fields['P'] = newpath;
 890
 891                 /*
 892                  * Determine if this message is set to be deleted
 893                  * after sending out on the network
 894                  */
 895                 if (msg->cm_fields['S'] != NULL) {
 896                         if (!strcasecmp(msg->cm_fields['S'], "CANCEL")) {
 897                                 delete_after_send = 1;
 898                         }
 899                 }
 900
 901                 /* Now send it to every node */
 902                 if (sc->ignet_push_shares != NULL)
 903                   for (mptr = sc->ignet_push_shares; mptr != NULL;
 904                     mptr = mptr->next) {
 905
 906                         send = 1;
 907
 908                         /* Check for valid node name */
 909                         if (is_valid_node(NULL, NULL, mptr->remote_nodename) != 0) {
 910                                 syslog(LOG_ERR, "Invalid node <%s>\n", mptr->remote_nodename);
 911                                 send = 0;
 912                         }
 913
 914                         /* Check for split horizon */
 915                         syslog(LOG_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 916                         bang = num_tokens(msg->cm_fields['P'], '!');
 917                         if (bang > 1) for (i=0; i<(bang-1); ++i) {
 918                                 extract_token(buf, msg->cm_fields['P'], i, '!', sizeof buf);
 919                                 syslog(LOG_DEBUG, "Compare <%s> to <%s>\n",
 920                                         buf, mptr->remote_nodename) ;
 921                                 if (!strcasecmp(buf, mptr->remote_nodename)) {
 922                                         send = 0;
 923                                         syslog(LOG_DEBUG, "Not sending to %s\n",
 924                                                 mptr->remote_nodename);
 925                                 }
 926                                 else {
 927                                         syslog(LOG_DEBUG, "Sending to %s\n", mptr->remote_nodename);
 928                                 }
 929                         }
 930
 931                         /* Send the message */
 932                         if (send == 1) {
 933
 934                                 /*
 935                                  * Force the message to appear in the correct room
 936                                  * on the far end by setting the C field correctly
 937                                  */
 938                                 if (msg->cm_fields['C'] != NULL) {
 939                                         free(msg->cm_fields['C']);
 940                                 }
 941                                 if (!IsEmptyStr(mptr->remote_roomname)) {
 942                                         msg->cm_fields['C'] = strdup(mptr->remote_roomname);
 943                                 }
 944                                 else {
 945                                         msg->cm_fields['C'] = strdup(CC->room.QRname);
 946                                 }
 947
 948                                 /* serialize it for transmission */
 949                                 serialize_message(&sermsg, msg);
 950                                 if (sermsg.len > 0) {
 951
 952                                         /* write it to a spool file */
 953                                         snprintf(filename, sizeof filename,"%s/%s@%lx%x",
 954                                                 ctdl_netout_dir,
 955                                                 mptr->remote_nodename,
 956                                                 time(NULL),
 957                                                 rand()
 958                                         );
 959                                         syslog(LOG_DEBUG, "Appending to %s\n", filename);
 960                                         fp = fopen(filename, "ab");
 961                                         if (fp != NULL) {
 962                                                 fwrite(sermsg.ser,
 963                                                         sermsg.len, 1, fp);
 964                                                 fclose(fp);
 965                                         }
 966                                         else {
 967                                                 syslog(LOG_ERR, "%s: %s\n", filename, strerror(errno));
 968                                         }
 969
 970                                         /* free the serialized version */
 971                                         free(sermsg.ser);
 972                                 }
 973
 974                         }
 975                 }
 976                 CtdlFreeMessage(msg);
 977         }
 978
 979         /* update lastsent */
 980         sc->lastsent = msgnum;
 981
 982         /* Delete this message if delete-after-send is set */
 983         if (delete_after_send) {
 984                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 985         }
 986
 987 }
 988
 989
 990 int read_spoolcontrol_file(SpoolControl **scc, char *filename)
 991 {
 992         FILE *fp;
 993         char instr[SIZ];
 994         char buf[SIZ];
 995         char nodename[256];
 996         char roomname[ROOMNAMELEN];
 997         size_t miscsize = 0;
 998         size_t linesize = 0;
 999         int skipthisline = 0;
1000         namelist *nptr = NULL;
1001         maplist *mptr = NULL;
1002         SpoolControl *sc;
1003
1004         fp = fopen(filename, "r");
1005         if (fp == NULL) {
1006                 return 0;
1007         }
1008         sc = malloc(sizeof(SpoolControl));
1009         memset(sc, 0, sizeof(SpoolControl));
1010         *scc = sc;
1011
1012         while (fgets(buf, sizeof buf, fp) != NULL) {
1013                 buf[strlen(buf)-1] = 0;
1014
1015                 extract_token(instr, buf, 0, '|', sizeof instr);
1016                 if (!strcasecmp(instr, strof(lastsent))) {
1017                         sc->lastsent = extract_long(buf, 1);
1018                 }
1019                 else if (!strcasecmp(instr, strof(listrecp))) {
1020                         nptr = (namelist *)
1021                                 malloc(sizeof(namelist));
1022                         nptr->next = sc->listrecps;
1023                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
1024                         sc->listrecps = nptr;
1025                 }
1026                 else if (!strcasecmp(instr, strof(participate))) {
1027                         nptr = (namelist *)
1028                                 malloc(sizeof(namelist));
1029                         nptr->next = sc->participates;
1030                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
1031                         sc->participates = nptr;
1032                 }
1033                 else if (!strcasecmp(instr, strof(digestrecp))) {
1034                         nptr = (namelist *)
1035                                 malloc(sizeof(namelist));
1036                         nptr->next = sc->digestrecps;
1037                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
1038                         sc->digestrecps = nptr;
1039                 }
1040                 else if (!strcasecmp(instr, strof(ignet_push_share))) {
1041                         extract_token(nodename, buf, 1, '|', sizeof nodename);
1042                         extract_token(roomname, buf, 2, '|', sizeof roomname);
1043                         mptr = (maplist *) malloc(sizeof(maplist));
1044                         mptr->next = sc->ignet_push_shares;
1045                         strcpy(mptr->remote_nodename, nodename);
1046                         strcpy(mptr->remote_roomname, roomname);
1047                         sc->ignet_push_shares = mptr;
1048                 }
1049                 else {
1050                         /* Preserve 'other' lines ... *unless* they happen to
1051                          * be subscribe/unsubscribe pendings with expired
1052                          * timestamps.
1053                          */
1054                         skipthisline = 0;
1055                         if (!strncasecmp(buf, strof(subpending)"|", 11)) {
1056                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
1057                                         skipthisline = 1;
1058                                 }
1059                         }
1060                         if (!strncasecmp(buf, strof(unsubpending)"|", 13)) {
1061                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
1062                                         skipthisline = 1;
1063                                 }
1064                         }
1065
1066                         if (skipthisline == 0) {
1067                                 linesize = strlen(buf);
1068                                 sc->misc = realloc(sc->misc,
1069                                         (miscsize + linesize + 2) );
1070                                 sprintf(&sc->misc[miscsize], "%s\n", buf);
1071                                 miscsize = miscsize + linesize + 1;
1072                         }
1073                 }
1074
1075
1076         }
1077         fclose(fp);
1078         return 1;
1079 }
1080
1081 void free_spoolcontrol_struct(SpoolControl **scc)
1082 {
1083         SpoolControl *sc;
1084         namelist *nptr = NULL;
1085         maplist *mptr = NULL;
1086
1087         sc = *scc;
1088         while (sc->listrecps != NULL) {
1089                 nptr = sc->listrecps->next;
1090                 free(sc->listrecps);
1091                 sc->listrecps = nptr;
1092         }
1093         /* Do the same for digestrecps */
1094         while (sc->digestrecps != NULL) {
1095                 nptr = sc->digestrecps->next;
1096                 free(sc->digestrecps);
1097                 sc->digestrecps = nptr;
1098         }
1099         /* Do the same for participates */
1100         while (sc->participates != NULL) {
1101                 nptr = sc->participates->next;
1102                 free(sc->participates);
1103                 sc->participates = nptr;
1104         }
1105         while (sc->ignet_push_shares != NULL) {
1106                 mptr = sc->ignet_push_shares->next;
1107                 free(sc->ignet_push_shares);
1108                 sc->ignet_push_shares = mptr;
1109         }
1110         free(sc->misc);
1111         free(sc);
1112         *scc=NULL;
1113 }
1114
1115 int writenfree_spoolcontrol_file(SpoolControl **scc, char *filename)
1116 {
1117         char tempfilename[PATH_MAX];
1118         int TmpFD;
1119         SpoolControl *sc;
1120         namelist *nptr = NULL;
1121         maplist *mptr = NULL;
1122         long len;
1123         time_t unixtime;
1124         struct timeval tv;
1125         long reltid; /* if we don't have SYS_gettid, use "random" value */
1126         StrBuf *Cfg;
1127         int rc;
1128
1129         len = strlen(filename);
1130         memcpy(tempfilename, filename, len + 1);
1131
1132
1133 #if defined(HAVE_SYSCALL_H) && defined (SYS_gettid)
1134         reltid = syscall(SYS_gettid);
1135 #endif
1136         gettimeofday(&tv, NULL);
1137         /* Promote to time_t; types differ on some OSes (like darwin) */
1138         unixtime = tv.tv_sec;
1139
1140         sprintf(tempfilename + len, ".%ld-%ld", reltid, unixtime);
1141         sc = *scc;
1142         errno = 0;
1143         TmpFD = open(tempfilename, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
1144         Cfg = NewStrBuf();
1145         if ((TmpFD < 0) || (errno != 0)) {
1146                 syslog(LOG_CRIT, "ERROR: cannot open %s: %s\n",
1147                         filename, strerror(errno));
1148                 free_spoolcontrol_struct(scc);
1149                 unlink(tempfilename);
1150         }
1151         else {
1152                 fchown(TmpFD, config.c_ctdluid, 0);
1153                 StrBufAppendPrintf(Cfg, "lastsent|%ld\n", sc->lastsent);
1154
1155                 /* Write out the listrecps while freeing from memory at the
1156                  * same time.  Am I clever or what?  :)
1157                  */
1158                 while (sc->listrecps != NULL) {
1159                     StrBufAppendPrintf(Cfg, "listrecp|%s\n", sc->listrecps->name);
1160                         nptr = sc->listrecps->next;
1161                         free(sc->listrecps);
1162                         sc->listrecps = nptr;
1163                 }
1164                 /* Do the same for digestrecps */
1165                 while (sc->digestrecps != NULL) {
1166                         StrBufAppendPrintf(Cfg, "digestrecp|%s\n", sc->digestrecps->name);
1167                         nptr = sc->digestrecps->next;
1168                         free(sc->digestrecps);
1169                         sc->digestrecps = nptr;
1170                 }
1171                 /* Do the same for participates */
1172                 while (sc->participates != NULL) {
1173                         StrBufAppendPrintf(Cfg, "participate|%s\n", sc->participates->name);
1174                         nptr = sc->participates->next;
1175                         free(sc->participates);
1176                         sc->participates = nptr;
1177                 }
1178                 while (sc->ignet_push_shares != NULL) {
1179                         StrBufAppendPrintf(Cfg, "ignet_push_share|%s", sc->ignet_push_shares->remote_nodename);
1180                         if (!IsEmptyStr(sc->ignet_push_shares->remote_roomname)) {
1181                                 StrBufAppendPrintf(Cfg, "|%s", sc->ignet_push_shares->remote_roomname);
1182                         }
1183                         StrBufAppendPrintf(Cfg, "\n");
1184                         mptr = sc->ignet_push_shares->next;
1185                         free(sc->ignet_push_shares);
1186                         sc->ignet_push_shares = mptr;
1187                 }
1188                 if (sc->misc != NULL) {
1189                         StrBufAppendBufPlain(Cfg, sc->misc, -1, 0);
1190                 }
1191                 free(sc->misc);
1192
1193                 rc = write(TmpFD, ChrPtr(Cfg), StrLength(Cfg));
1194                 if ((rc >=0 ) && (rc == StrLength(Cfg)))
1195                 {
1196                         close(TmpFD);
1197                         rename(tempfilename, filename);
1198                 }
1199                 else {
1200                         syslog(LOG_EMERG,
1201                                       "unable to write %s; [%s]; not enough space on the disk?\n",
1202                                       tempfilename,
1203                                       strerror(errno));
1204                         close(TmpFD);
1205                         unlink(tempfilename);
1206                 }
1207                 FreeStrBuf(&Cfg);
1208                 free(sc);
1209                 *scc=NULL;
1210         }
1211         return 1;
1212 }
1213 int is_recipient(SpoolControl *sc, const char *Name)
1214 {
1215         namelist *nptr;
1216         size_t len;
1217
1218         len = strlen(Name);
1219         nptr = sc->listrecps;
1220         while (nptr != NULL) {
1221                 if (strncmp(Name, nptr->name, len)==0)
1222                         return 1;
1223                 nptr = nptr->next;
1224         }
1225         /* Do the same for digestrecps */
1226         nptr = sc->digestrecps;
1227         while (nptr != NULL) {
1228                 if (strncmp(Name, nptr->name, len)==0)
1229                         return 1;
1230                 nptr = nptr->next;
1231         }
1232         /* Do the same for participates */
1233         nptr = sc->participates;
1234         while (nptr != NULL) {
1235                 if (strncmp(Name, nptr->name, len)==0)
1236                         return 1;
1237                 nptr = nptr->next;
1238         }
1239         return 0;
1240 }
1241
1242
1243 /*
1244  * Batch up and send all outbound traffic from the current room
1245  */
1246 void network_spoolout_room(char *room_to_spool) {
1247         char buf[SIZ];
1248         char filename[PATH_MAX];
1249         SpoolControl *sc;
1250         int i;
1251
1252         /*
1253          * If the room doesn't exist, don't try to perform its networking tasks.
1254          * Normally this should never happen, but once in a while maybe a room gets
1255          * queued for networking and then deleted before it can happen.
1256          */
1257         if (CtdlGetRoom(&CC->room, room_to_spool) != 0) {
1258                 syslog(LOG_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
1259                 return;
1260         }
1261
1262         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1263         begin_critical_section(S_NETCONFIGS);
1264
1265         /* Only do net processing for rooms that have netconfigs */
1266         if (!read_spoolcontrol_file(&sc, filename))
1267         {
1268                 end_critical_section(S_NETCONFIGS);
1269                 return;
1270         }
1271         syslog(LOG_INFO, "Networking started for <%s>\n", CC->room.QRname);
1272
1273         /* If there are digest recipients, we have to build a digest */
1274         if (sc->digestrecps != NULL) {
1275                 sc->digestfp = tmpfile();
1276                 fprintf(sc->digestfp, "Content-type: text/plain\n\n");
1277         }
1278
1279         /* Do something useful */
1280         CtdlForEachMessage(MSGS_GT, sc->lastsent, NULL, NULL, NULL,
1281                 network_spool_msg, sc);
1282
1283         /* If we wrote a digest, deliver it and then close it */
1284         snprintf(buf, sizeof buf, "room_%s@%s",
1285                 CC->room.QRname, config.c_fqdn);
1286         for (i=0; buf[i]; ++i) {
1287                 buf[i] = tolower(buf[i]);
1288                 if (isspace(buf[i])) buf[i] = '_';
1289         }
1290         if (sc->digestfp != NULL) {
1291                 fprintf(sc->digestfp,   " -----------------------------------"
1292                                         "------------------------------------"
1293                                         "-------\n"
1294                                         "You are subscribed to the '%s' "
1295                                         "list.\n"
1296                                         "To post to the list: %s\n",
1297                                         CC->room.QRname, buf
1298                 );
1299                 network_deliver_digest(sc);     /* deliver and close */
1300         }
1301
1302         /* Now rewrite the config file */
1303         writenfree_spoolcontrol_file(&sc, filename);
1304         end_critical_section(S_NETCONFIGS);
1305 }
1306
1307
1308
1309 /*
1310  * Send the *entire* contents of the current room to one specific network node,
1311  * ignoring anything we know about which messages have already undergone
1312  * network processing.  This can be used to bring a new node into sync.
1313  */
1314 int network_sync_to(char *target_node) {
1315         SpoolControl sc;
1316         int num_spooled = 0;
1317         int found_node = 0;
1318         char buf[256];
1319         char sc_type[256];
1320         char sc_node[256];
1321         char sc_room[256];
1322         char filename[PATH_MAX];
1323         FILE *fp;
1324
1325         /* Grab the configuration line we're looking for */
1326         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1327         begin_critical_section(S_NETCONFIGS);
1328         fp = fopen(filename, "r");
1329         if (fp == NULL) {
1330                 end_critical_section(S_NETCONFIGS);
1331                 return(-1);
1332         }
1333         while (fgets(buf, sizeof buf, fp) != NULL) {
1334                 buf[strlen(buf)-1] = 0;
1335                 extract_token(sc_type, buf, 0, '|', sizeof sc_type);
1336                 extract_token(sc_node, buf, 1, '|', sizeof sc_node);
1337                 extract_token(sc_room, buf, 2, '|', sizeof sc_room);
1338                 if ( (!strcasecmp(sc_type, "ignet_push_share"))
1339                    && (!strcasecmp(sc_node, target_node)) ) {
1340                         found_node = 1;
1341
1342                         /* Concise syntax because we don't need a full linked-list */
1343                         memset(&sc, 0, sizeof(SpoolControl));
1344                         sc.ignet_push_shares = (maplist *)
1345                                 malloc(sizeof(maplist));
1346                         sc.ignet_push_shares->next = NULL;
1347                         safestrncpy(sc.ignet_push_shares->remote_nodename,
1348                                 sc_node,
1349                                 sizeof sc.ignet_push_shares->remote_nodename);
1350                         safestrncpy(sc.ignet_push_shares->remote_roomname,
1351                                 sc_room,
1352                                 sizeof sc.ignet_push_shares->remote_roomname);
1353                 }
1354         }
1355         fclose(fp);
1356         end_critical_section(S_NETCONFIGS);
1357
1358         if (!found_node) return(-1);
1359
1360         /* Send ALL messages */
1361         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL,
1362                 network_spool_msg, &sc);
1363
1364         /* Concise cleanup because we know there's only one node in the sc */
1365         free(sc.ignet_push_shares);
1366
1367         syslog(LOG_NOTICE, "Synchronized %d messages to <%s>\n",
1368                 num_spooled, target_node);
1369         return(num_spooled);
1370 }
1371
1372
1373 /*
1374  * Implements the NSYN command
1375  */
1376 void cmd_nsyn(char *argbuf) {
1377         int num_spooled;
1378         char target_node[256];
1379
1380         if (CtdlAccessCheck(ac_aide)) return;
1381
1382         extract_token(target_node, argbuf, 0, '|', sizeof target_node);
1383         num_spooled = network_sync_to(target_node);
1384         if (num_spooled >= 0) {
1385                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
1386         }
1387         else {
1388                 cprintf("%d No such room/node share exists.\n",
1389                         ERROR + ROOM_NOT_FOUND);
1390         }
1391 }
1392
1393
1394
1395 /*
1396  * Batch up and send all outbound traffic from the current room
1397  */
1398 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
1399         struct RoomProcList *ptr;
1400
1401         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
1402         if (ptr == NULL) return;
1403
1404         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
1405         begin_critical_section(S_RPLIST);
1406         ptr->next = rplist;
1407         rplist = ptr;
1408         end_critical_section(S_RPLIST);
1409 }
1410
1411 void destroy_network_queue_room(void)
1412 {
1413         struct RoomProcList *cur, *p;
1414         NetMap *nmcur, *nmp;
1415
1416         cur = rplist;
1417         begin_critical_section(S_RPLIST);
1418         while (cur != NULL)
1419         {
1420                 p = cur->next;
1421                 free (cur);
1422                 cur = p;
1423         }
1424         rplist = NULL;
1425         end_critical_section(S_RPLIST);
1426
1427         nmcur = the_netmap;
1428         while (nmcur != NULL)
1429         {
1430                 nmp = nmcur->next;
1431                 free (nmcur);
1432                 nmcur = nmp;
1433         }
1434         the_netmap = NULL;
1435         if (working_ignetcfg != NULL)
1436                 free (working_ignetcfg);
1437         working_ignetcfg = NULL;
1438 }
1439
1440
1441 /*
1442  * Learn topology from path fields
1443  */
1444 void network_learn_topology(char *node, char *path) {
1445         char nexthop[256];
1446         NetMap *nmptr;
1447
1448         strcpy(nexthop, "");
1449
1450         if (num_tokens(path, '!') < 3) return;
1451         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
1452                 if (!strcasecmp(nmptr->nodename, node)) {
1453                         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1454                         nmptr->lastcontact = time(NULL);
1455                         ++netmap_changed;
1456                         return;
1457                 }
1458         }
1459
1460         /* If we got here then it's not in the map, so add it. */
1461         nmptr = (NetMap *) malloc(sizeof (NetMap));
1462         strcpy(nmptr->nodename, node);
1463         nmptr->lastcontact = time(NULL);
1464         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1465         nmptr->next = the_netmap;
1466         the_netmap = nmptr;
1467         ++netmap_changed;
1468 }
1469
1470
1471
1472
1473 /*
1474  * Bounce a message back to the sender
1475  */
1476 void network_bounce(struct CtdlMessage *msg, char *reason) {
1477         char *oldpath = NULL;
1478         char buf[SIZ];
1479         char bouncesource[SIZ];
1480         char recipient[SIZ];
1481         struct recptypes *valid = NULL;
1482         char force_room[ROOMNAMELEN];
1483         static int serialnum = 0;
1484         size_t size;
1485
1486         syslog(LOG_DEBUG, "entering network_bounce()\n");
1487
1488         if (msg == NULL) return;
1489
1490         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
1491
1492         /*
1493          * Give it a fresh message ID
1494          */
1495         if (msg->cm_fields['I'] != NULL) {
1496                 free(msg->cm_fields['I']);
1497         }
1498         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
1499                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
1500         msg->cm_fields['I'] = strdup(buf);
1501
1502         /*
1503          * FIXME ... right now we're just sending a bounce; we really want to
1504          * include the text of the bounced message.
1505          */
1506         if (msg->cm_fields['M'] != NULL) {
1507                 free(msg->cm_fields['M']);
1508         }
1509         msg->cm_fields['M'] = strdup(reason);
1510         msg->cm_format_type = 0;
1511
1512         /*
1513          * Turn the message around
1514          */
1515         if (msg->cm_fields['R'] == NULL) {
1516                 free(msg->cm_fields['R']);
1517         }
1518
1519         if (msg->cm_fields['D'] == NULL) {
1520                 free(msg->cm_fields['D']);
1521         }
1522
1523         snprintf(recipient, sizeof recipient, "%s@%s",
1524                 msg->cm_fields['A'], msg->cm_fields['N']);
1525
1526         if (msg->cm_fields['A'] == NULL) {
1527                 free(msg->cm_fields['A']);
1528         }
1529
1530         if (msg->cm_fields['N'] == NULL) {
1531                 free(msg->cm_fields['N']);
1532         }
1533
1534         if (msg->cm_fields['U'] == NULL) {
1535                 free(msg->cm_fields['U']);
1536         }
1537
1538         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1539         msg->cm_fields['N'] = strdup(config.c_nodename);
1540         msg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
1541
1542         /* prepend our node to the path */
1543         if (msg->cm_fields['P'] != NULL) {
1544                 oldpath = msg->cm_fields['P'];
1545                 msg->cm_fields['P'] = NULL;
1546         }
1547         else {
1548                 oldpath = strdup("unknown_user");
1549         }
1550         size = strlen(oldpath) + SIZ;
1551         msg->cm_fields['P'] = malloc(size);
1552         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1553         free(oldpath);
1554
1555         /* Now submit the message */
1556         valid = validate_recipients(recipient, NULL, 0);
1557         if (valid != NULL) if (valid->num_error != 0) {
1558                 free_recipients(valid);
1559                 valid = NULL;
1560         }
1561         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1562                 strcpy(force_room, config.c_aideroom);
1563         }
1564         else {
1565                 strcpy(force_room, "");
1566         }
1567         if ( (valid == NULL) && IsEmptyStr(force_room) ) {
1568                 strcpy(force_room, config.c_aideroom);
1569         }
1570         CtdlSubmitMsg(msg, valid, force_room, 0);
1571
1572         /* Clean up */
1573         if (valid != NULL) free_recipients(valid);
1574         CtdlFreeMessage(msg);
1575         syslog(LOG_DEBUG, "leaving network_bounce()\n");
1576 }
1577
1578
1579
1580
1581 /*
1582  * Process a buffer containing a single message from a single file
1583  * from the inbound queue
1584  */
1585 void network_process_buffer(char *buffer, long size) {
1586         struct CtdlMessage *msg = NULL;
1587         long pos;
1588         int field;
1589         struct recptypes *recp = NULL;
1590         char target_room[ROOMNAMELEN];
1591         struct ser_ret sermsg;
1592         char *oldpath = NULL;
1593         char filename[PATH_MAX];
1594         FILE *fp;
1595         char nexthop[SIZ];
1596         unsigned char firstbyte;
1597         unsigned char lastbyte;
1598
1599         syslog(LOG_DEBUG, "network_process_buffer() processing %ld bytes\n", size);
1600
1601         /* Validate just a little bit.  First byte should be FF and * last byte should be 00. */
1602         firstbyte = buffer[0];
1603         lastbyte = buffer[size-1];
1604         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1605                 syslog(LOG_ERR, "Corrupt message ignored.  Length=%ld, firstbyte = %d, lastbyte = %d\n",
1606                         size, firstbyte, lastbyte);
1607                 return;
1608         }
1609
1610         /* Set default target room to trash */
1611         strcpy(target_room, TWITROOM);
1612
1613         /* Load the message into memory */
1614         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1615         memset(msg, 0, sizeof(struct CtdlMessage));
1616         msg->cm_magic = CTDLMESSAGE_MAGIC;
1617         msg->cm_anon_type = buffer[1];
1618         msg->cm_format_type = buffer[2];
1619
1620         for (pos = 3; pos < size; ++pos) {
1621                 field = buffer[pos];
1622                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1623                 pos = pos + strlen(&buffer[(int)pos]);
1624         }
1625
1626         /* Check for message routing */
1627         if (msg->cm_fields['D'] != NULL) {
1628                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1629
1630                         /* route the message */
1631                         strcpy(nexthop, "");
1632                         if (is_valid_node(nexthop, NULL, msg->cm_fields['D']) == 0) {
1633                                 /* prepend our node to the path */
1634                                 if (msg->cm_fields['P'] != NULL) {
1635                                         oldpath = msg->cm_fields['P'];
1636                                         msg->cm_fields['P'] = NULL;
1637                                 }
1638                                 else {
1639                                         oldpath = strdup("unknown_user");
1640                                 }
1641                                 size = strlen(oldpath) + SIZ;
1642                                 msg->cm_fields['P'] = malloc(size);
1643                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1644                                         config.c_nodename, oldpath);
1645                                 free(oldpath);
1646
1647                                 /* serialize the message */
1648                                 serialize_message(&sermsg, msg);
1649
1650                                 /* now send it */
1651                                 if (IsEmptyStr(nexthop)) {
1652                                         strcpy(nexthop, msg->cm_fields['D']);
1653                                 }
1654                                 snprintf(filename,
1655                                         sizeof filename,
1656                                         "%s/%s@%lx%x",
1657                                         ctdl_netout_dir,
1658                                         nexthop,
1659                                         time(NULL),
1660                                         rand()
1661                                 );
1662                                 syslog(LOG_DEBUG, "Appending to %s\n", filename);
1663                                 fp = fopen(filename, "ab");
1664                                 if (fp != NULL) {
1665                                         fwrite(sermsg.ser, sermsg.len, 1, fp);
1666                                         fclose(fp);
1667                                 }
1668                                 else {
1669                                         syslog(LOG_ERR, "%s: %s\n", filename, strerror(errno));
1670                                 }
1671                                 free(sermsg.ser);
1672                                 CtdlFreeMessage(msg);
1673                                 return;
1674                         }
1675
1676                         else {  /* invalid destination node name */
1677
1678                                 network_bounce(msg,
1679 "A message you sent could not be delivered due to an invalid destination node"
1680 " name.  Please check the address and try sending the message again.\n");
1681                                 msg = NULL;
1682                                 return;
1683
1684                         }
1685                 }
1686         }
1687
1688         /*
1689          * Check to see if we already have a copy of this message, and
1690          * abort its processing if so.  (We used to post a warning to Aide>
1691          * every time this happened, but the network is now so densely
1692          * connected that it's inevitable.)
1693          */
1694         if (network_usetable(msg) != 0) {
1695                 CtdlFreeMessage(msg);
1696                 return;
1697         }
1698
1699         /* Learn network topology from the path */
1700         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1701                 network_learn_topology(msg->cm_fields['N'], msg->cm_fields['P']);
1702         }
1703
1704         /* Is the sending node giving us a very persuasive suggestion about
1705          * which room this message should be saved in?  If so, go with that.
1706          */
1707         if (msg->cm_fields['C'] != NULL) {
1708                 safestrncpy(target_room, msg->cm_fields['C'], sizeof target_room);
1709         }
1710
1711         /* Otherwise, does it have a recipient?  If so, validate it... */
1712         else if (msg->cm_fields['R'] != NULL) {
1713                 recp = validate_recipients(msg->cm_fields['R'], NULL, 0);
1714                 if (recp != NULL) if (recp->num_error != 0) {
1715                         network_bounce(msg,
1716                                 "A message you sent could not be delivered due to an invalid address.\n"
1717                                 "Please check the address and try sending the message again.\n");
1718                         msg = NULL;
1719                         free_recipients(recp);
1720                         syslog(LOG_DEBUG, "Bouncing message due to invalid recipient address.\n");
1721                         return;
1722                 }
1723                 strcpy(target_room, "");        /* no target room if mail */
1724         }
1725
1726         /* Our last shot at finding a home for this message is to see if
1727          * it has the O field (Originating room) set.
1728          */
1729         else if (msg->cm_fields['O'] != NULL) {
1730                 safestrncpy(target_room, msg->cm_fields['O'], sizeof target_room);
1731         }
1732
1733         /* Strip out fields that are only relevant during transit */
1734         if (msg->cm_fields['D'] != NULL) {
1735                 free(msg->cm_fields['D']);
1736                 msg->cm_fields['D'] = NULL;
1737         }
1738         if (msg->cm_fields['C'] != NULL) {
1739                 free(msg->cm_fields['C']);
1740                 msg->cm_fields['C'] = NULL;
1741         }
1742
1743         /* save the message into a room */
1744         if (PerformNetprocHooks(msg, target_room) == 0) {
1745                 msg->cm_flags = CM_SKIP_HOOKS;
1746                 CtdlSubmitMsg(msg, recp, target_room, 0);
1747         }
1748         CtdlFreeMessage(msg);
1749         free_recipients(recp);
1750 }
1751
1752
1753 /*
1754  * Process a single message from a single file from the inbound queue
1755  */
1756 void network_process_message(FILE *fp, long msgstart, long msgend) {
1757         long hold_pos;
1758         long size;
1759         char *buffer;
1760
1761         hold_pos = ftell(fp);
1762         size = msgend - msgstart + 1;
1763         buffer = malloc(size);
1764         if (buffer != NULL) {
1765                 fseek(fp, msgstart, SEEK_SET);
1766                 if (fread(buffer, size, 1, fp) > 0) {
1767                         network_process_buffer(buffer, size);
1768                 }
1769                 free(buffer);
1770         }
1771
1772         fseek(fp, hold_pos, SEEK_SET);
1773 }
1774
1775
1776 /*
1777  * Process a single file from the inbound queue
1778  */
1779 void network_process_file(char *filename) {
1780         FILE *fp;
1781         long msgstart = (-1L);
1782         long msgend = (-1L);
1783         long msgcur = 0L;
1784         int ch;
1785
1786
1787         fp = fopen(filename, "rb");
1788         if (fp == NULL) {
1789                 syslog(LOG_CRIT, "Error opening %s: %s\n", filename, strerror(errno));
1790                 return;
1791         }
1792
1793         fseek(fp, 0L, SEEK_END);
1794         syslog(LOG_INFO, "network: processing %ld bytes from %s\n", ftell(fp), filename);
1795         rewind(fp);
1796
1797         /* Look for messages in the data stream and break them out */
1798         while (ch = getc(fp), ch >= 0) {
1799
1800                 if (ch == 255) {
1801                         if (msgstart >= 0L) {
1802                                 msgend = msgcur - 1;
1803                                 network_process_message(fp, msgstart, msgend);
1804                         }
1805                         msgstart = msgcur;
1806                 }
1807
1808                 ++msgcur;
1809         }
1810
1811         msgend = msgcur - 1;
1812         if (msgstart >= 0L) {
1813                 network_process_message(fp, msgstart, msgend);
1814         }
1815
1816         fclose(fp);
1817         unlink(filename);
1818 }
1819
1820
1821 /*
1822  * Process anything in the inbound queue
1823  */
1824 void network_do_spoolin(void) {
1825         DIR *dp;
1826         struct dirent *d;
1827         struct stat statbuf;
1828         char filename[PATH_MAX];
1829         static time_t last_spoolin_mtime = 0L;
1830
1831         /*
1832          * Check the spoolin directory's modification time.  If it hasn't
1833          * been touched, we don't need to scan it.
1834          */
1835         if (stat(ctdl_netin_dir, &statbuf)) return;
1836         if (statbuf.st_mtime == last_spoolin_mtime) {
1837                 syslog(LOG_DEBUG, "network: nothing in inbound queue\n");
1838                 return;
1839         }
1840         last_spoolin_mtime = statbuf.st_mtime;
1841         syslog(LOG_DEBUG, "network: processing inbound queue\n");
1842
1843         /*
1844          * Ok, there's something interesting in there, so scan it.
1845          */
1846         dp = opendir(ctdl_netin_dir);
1847         if (dp == NULL) return;
1848
1849         while (d = readdir(dp), d != NULL) {
1850                 if ((strcmp(d->d_name, ".")) && (strcmp(d->d_name, ".."))) {
1851                         snprintf(filename,
1852                                 sizeof filename,
1853                                 "%s/%s",
1854                                 ctdl_netin_dir,
1855                                 d->d_name
1856                         );
1857                         network_process_file(filename);
1858                 }
1859         }
1860
1861         closedir(dp);
1862 }
1863
1864 /*
1865  * Step 1: consolidate files in the outbound queue into one file per neighbor node
1866  * Step 2: delete any files in the outbound queue that were for neighbors who no longer exist.
1867  */
1868 void network_consolidate_spoolout(void) {
1869         DIR *dp;
1870         struct dirent *d;
1871         char filename[PATH_MAX];
1872         char cmd[PATH_MAX];
1873         char nexthop[256];
1874         int i;
1875         char *ptr;
1876
1877         /* Step 1: consolidate files in the outbound queue into one file per neighbor node */
1878         dp = opendir(ctdl_netout_dir);
1879         if (dp == NULL) return;
1880         while (d = readdir(dp), d != NULL) {
1881                 if (
1882                         (strcmp(d->d_name, "."))
1883                         && (strcmp(d->d_name, ".."))
1884                         && (strchr(d->d_name, '@') != NULL)
1885                 ) {
1886                         safestrncpy(nexthop, d->d_name, sizeof nexthop);
1887                         ptr = strchr(nexthop, '@');
1888                         if (ptr) *ptr = 0;
1889
1890                         snprintf(filename,
1891                                 sizeof filename,
1892                                 "%s/%s",
1893                                 ctdl_netout_dir,
1894                                 d->d_name
1895                         );
1896
1897                         syslog(LOG_DEBUG, "Consolidate %s to %s\n", filename, nexthop);
1898                         if (network_talking_to(nexthop, NTT_CHECK)) {
1899                                 syslog(LOG_DEBUG,
1900                                         "Currently online with %s - skipping for now\n",
1901                                         nexthop
1902                                 );
1903                         }
1904                         else {
1905                                 network_talking_to(nexthop, NTT_ADD);
1906                                 snprintf(cmd, sizeof cmd, "/bin/cat %s >>%s/%s && /bin/rm -f %s",
1907                                         filename,
1908                                         ctdl_netout_dir, nexthop,
1909                                         filename
1910                                 );
1911                                 system(cmd);
1912                                 network_talking_to(nexthop, NTT_REMOVE);
1913                         }
1914                 }
1915         }
1916         closedir(dp);
1917
1918         /* Step 2: delete any files in the outbound queue that were for neighbors who no longer exist */
1919
1920         dp = opendir(ctdl_netout_dir);
1921         if (dp == NULL) return;
1922
1923         while (d = readdir(dp), d != NULL) {
1924                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
1925                         continue;
1926                 ptr = strchr(d->d_name, '@');
1927                 if (d != NULL)
1928                         continue;
1929                 snprintf(filename,
1930                         sizeof filename,
1931                         "%s/%s",
1932                         ctdl_netout_dir,
1933                         d->d_name
1934                 );
1935
1936                 strcpy(nexthop, "");
1937                 i = is_valid_node(nexthop, NULL, d->d_name);
1938
1939                 if ( (i != 0) || !IsEmptyStr(nexthop) ) {
1940                         unlink(filename);
1941                 }
1942         }
1943
1944
1945         closedir(dp);
1946 }
1947
1948
1949 /*
1950  * receive network spool from the remote system
1951  */
1952 void receive_spool(int *sock, char *remote_nodename) {
1953         int download_len = 0L;
1954         int bytes_received = 0L;
1955         char buf[SIZ];
1956         char tempfilename[PATH_MAX];
1957         char permfilename[PATH_MAX];
1958         int plen;
1959         FILE *fp;
1960
1961         snprintf(tempfilename,
1962                 sizeof tempfilename,
1963                 "%s/%s.%lx%x",
1964                 ctdl_nettmp_dir,
1965                 remote_nodename,
1966                 time(NULL),
1967                 rand()
1968         );
1969
1970         snprintf(permfilename,
1971                 sizeof permfilename,
1972                 "%s/%s.%lx%x",
1973                 ctdl_netin_dir,
1974                 remote_nodename,
1975                 time(NULL),
1976                 rand()
1977         );
1978
1979         if (sock_puts(sock, "NDOP") < 0) return;
1980         if (sock_getln(sock, buf, sizeof buf) < 0) return;
1981         syslog(LOG_DEBUG, "<%s\n", buf);
1982         if (buf[0] != '2') {
1983                 return;
1984         }
1985
1986         download_len = extract_long(&buf[4], 0);
1987         if (download_len <= 0) {
1988                 return;
1989         }
1990
1991         bytes_received = 0L;
1992         fp = fopen(tempfilename, "w");
1993         if (fp == NULL) {
1994                 syslog(LOG_CRIT, "Cannot create %s: %s\n", tempfilename, strerror(errno));
1995                 return;
1996         }
1997
1998         syslog(LOG_DEBUG, "Expecting to transfer %d bytes\n", download_len);
1999         while (bytes_received < download_len) {
2000                 /*
2001                  * If shutting down we can exit here and unlink the temp file.
2002                  * this shouldn't loose us any messages.
2003                  */
2004                 if (server_shutting_down)
2005                 {
2006                         fclose(fp);
2007                         unlink(tempfilename);
2008                         return;
2009                 }
2010                 snprintf(buf, sizeof buf, "READ %d|%d",
2011                          bytes_received,
2012                          ((download_len - bytes_received > IGNET_PACKET_SIZE)
2013                           ? IGNET_PACKET_SIZE : (download_len - bytes_received))
2014                 );
2015
2016                 if (sock_puts(sock, buf) < 0) {
2017                         fclose(fp);
2018                         unlink(tempfilename);
2019                         return;
2020                 }
2021                 if (sock_getln(sock, buf, sizeof buf) < 0) {
2022                         fclose(fp);
2023                         unlink(tempfilename);
2024                         return;
2025                 }
2026
2027                 if (buf[0] == '6') {
2028                         plen = extract_int(&buf[4], 0);
2029                         StrBuf *pbuf = NewStrBuf();
2030                         if (socket_read_blob(sock, pbuf, plen, CLIENT_TIMEOUT) != plen) {
2031                                 syslog(LOG_INFO, "Short read from peer; aborting.\n");
2032                                 fclose(fp);
2033                                 unlink(tempfilename);
2034                                 FreeStrBuf(&pbuf);
2035                                 return;
2036                         }
2037                         fwrite(ChrPtr(pbuf), plen, 1, fp);
2038                         bytes_received += plen;
2039                         FreeStrBuf(&pbuf);
2040                 }
2041         }
2042
2043         fclose(fp);
2044
2045         /* Last chance for shutdown exit */
2046         if (server_shutting_down)
2047         {
2048                 unlink(tempfilename);
2049                 return;
2050         }
2051
2052         if (sock_puts(sock, "CLOS") < 0) {
2053                 unlink(tempfilename);
2054                 return;
2055         }
2056
2057         /*
2058          * From here on we must complete or messages will get lost
2059          */
2060         if (sock_getln(sock, buf, sizeof buf) < 0) {
2061                 unlink(tempfilename);
2062                 return;
2063         }
2064
2065         syslog(LOG_DEBUG, "%s\n", buf);
2066
2067         /*
2068          * Now move the temp file to its permanent location.
2069          */
2070         if (link(tempfilename, permfilename) != 0) {
2071                 syslog(LOG_ALERT, "Could not link %s to %s: %s\n",
2072                         tempfilename, permfilename, strerror(errno)
2073                 );
2074         }
2075
2076         unlink(tempfilename);
2077 }
2078
2079
2080
2081 /*
2082  * transmit network spool to the remote system
2083  */
2084 void transmit_spool(int *sock, char *remote_nodename)
2085 {
2086         char buf[SIZ];
2087         char pbuf[4096];
2088         long plen;
2089         long bytes_to_write, thisblock, bytes_written;
2090         int fd;
2091         char sfname[128];
2092
2093         if (sock_puts(sock, "NUOP") < 0) return;
2094         if (sock_getln(sock, buf, sizeof buf) < 0) return;
2095         syslog(LOG_DEBUG, "<%s\n", buf);
2096         if (buf[0] != '2') {
2097                 return;
2098         }
2099
2100         snprintf(sfname, sizeof sfname,
2101                 "%s/%s",
2102                 ctdl_netout_dir,
2103                 remote_nodename
2104         );
2105         fd = open(sfname, O_RDONLY);
2106         if (fd < 0) {
2107                 if (errno != ENOENT) {
2108                         syslog(LOG_CRIT, "cannot open %s: %s\n", sfname, strerror(errno));
2109                 }
2110                 return;
2111         }
2112         bytes_written = 0;
2113         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
2114                 bytes_to_write = plen;
2115                 while (bytes_to_write > 0L) {
2116                         /* Exit if shutting down */
2117                         if (server_shutting_down)
2118                         {
2119                                 close(fd);
2120                                 return;
2121                         }
2122
2123                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
2124                         if (sock_puts(sock, buf) < 0) {
2125                                 close(fd);
2126                                 return;
2127                         }
2128                         if (sock_getln(sock, buf, sizeof buf) < 0) {
2129                                 close(fd);
2130                                 return;
2131                         }
2132                         thisblock = atol(&buf[4]);
2133                         if (buf[0] == '7') {
2134                                 if (sock_write(sock, pbuf, (int) thisblock) < 0) {
2135                                         close(fd);
2136                                         return;
2137                                 }
2138                                 bytes_to_write -= thisblock;
2139                                 bytes_written += thisblock;
2140                         } else {
2141                                 goto ABORTUPL;
2142                         }
2143                 }
2144         }
2145
2146 ABORTUPL:
2147         close(fd);
2148
2149         /* Last chance for shutdown exit */
2150         if(server_shutting_down)
2151                 return;
2152
2153         if (sock_puts(sock, "UCLS 1") < 0) return;
2154
2155         /*
2156          * From here on we must complete or messages will get lost
2157          */
2158         if (sock_getln(sock, buf, sizeof buf) < 0) return;
2159         syslog(LOG_NOTICE, "Sent %ld octets to <%s>\n", bytes_written, remote_nodename);
2160         syslog(LOG_DEBUG, "<%s\n", buf);
2161         if (buf[0] == '2') {
2162                 syslog(LOG_DEBUG, "Removing <%s>\n", sfname);
2163                 unlink(sfname);
2164         }
2165 }
2166
2167
2168
2169 /*
2170  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
2171  */
2172 void network_poll_node(char *node, char *secret, char *host, char *port) {
2173         int sock;
2174         char buf[SIZ];
2175         char err_buf[SIZ];
2176         char connected_to[SIZ];
2177         CitContext *CCC=CC;
2178
2179         if (network_talking_to(node, NTT_CHECK)) return;
2180         network_talking_to(node, NTT_ADD);
2181         syslog(LOG_DEBUG, "network: polling <%s>\n", node);
2182         syslog(LOG_NOTICE, "Connecting to <%s> at %s:%s\n", node, host, port);
2183
2184         sock = sock_connect(host, port);
2185         if (sock < 0) {
2186                 syslog(LOG_ERR, "Could not connect: %s\n", strerror(errno));
2187                 network_talking_to(node, NTT_REMOVE);
2188                 return;
2189         }
2190
2191         syslog(LOG_DEBUG, "Connected!\n");
2192         CCC->SBuf.Buf = NewStrBuf();
2193         CCC->sMigrateBuf = NewStrBuf();
2194         CCC->SBuf.ReadWritePointer = NULL;
2195
2196         /* Read the server greeting */
2197         if (sock_getln(&sock, buf, sizeof buf) < 0) goto bail;
2198         syslog(LOG_DEBUG, ">%s\n", buf);
2199
2200         /* Check that the remote is who we think it is and warn the Aide if not */
2201         extract_token (connected_to, buf, 1, ' ', sizeof connected_to);
2202         if (strcmp(connected_to, node))
2203         {
2204                 snprintf(err_buf, sizeof(err_buf),
2205                         "Connected to node \"%s\" but I was expecting to connect to node \"%s\".",
2206                         connected_to, node
2207                 );
2208                 syslog(LOG_ERR, "%s\n", err_buf);
2209                 CtdlAideMessage(err_buf, "Network error");
2210         }
2211         else {
2212                 /* We're talking to the correct node.  Now identify ourselves. */
2213                 snprintf(buf, sizeof buf, "NETP %s|%s", config.c_nodename, secret);
2214                 syslog(LOG_DEBUG, "<%s\n", buf);
2215                 if (sock_puts(&sock, buf) <0) goto bail;
2216                 if (sock_getln(&sock, buf, sizeof buf) < 0) goto bail;
2217                 syslog(LOG_DEBUG, ">%s\n", buf);
2218                 if (buf[0] != '2') {
2219                         goto bail;
2220                 }
2221
2222                 /* At this point we are authenticated. */
2223                 if (!server_shutting_down)
2224                         receive_spool(&sock, node);
2225                 if (!server_shutting_down)
2226                         transmit_spool(&sock, node);
2227         }
2228
2229         sock_puts(&sock, "QUIT");
2230 bail:
2231         FreeStrBuf(&CCC->SBuf.Buf);
2232         FreeStrBuf(&CCC->sMigrateBuf);
2233         if (sock != -1)
2234                 sock_close(sock);
2235         network_talking_to(node, NTT_REMOVE);
2236 }
2237
2238
2239
2240 /*
2241  * Poll other Citadel nodes and transfer inbound/outbound network data.
2242  * Set "full" to nonzero to force a poll of every node, or to zero to poll
2243  * only nodes to which we have data to send.
2244  */
2245 void network_poll_other_citadel_nodes(int full_poll) {
2246         int i;
2247         char linebuf[256];
2248         char node[SIZ];
2249         char host[256];
2250         char port[256];
2251         char secret[256];
2252         int poll = 0;
2253         char spoolfile[256];
2254
2255         if (working_ignetcfg == NULL) {
2256                 syslog(LOG_DEBUG, "network: no neighbor nodes are configured - not polling.\n");
2257                 return;
2258         }
2259
2260         /* Use the string tokenizer to grab one line at a time */
2261         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
2262                 if(server_shutting_down)
2263                         return;
2264                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
2265                 extract_token(node, linebuf, 0, '|', sizeof node);
2266                 extract_token(secret, linebuf, 1, '|', sizeof secret);
2267                 extract_token(host, linebuf, 2, '|', sizeof host);
2268                 extract_token(port, linebuf, 3, '|', sizeof port);
2269                 if ( !IsEmptyStr(node) && !IsEmptyStr(secret)
2270                    && !IsEmptyStr(host) && !IsEmptyStr(port)) {
2271                         poll = full_poll;
2272                         if (poll == 0) {
2273                                 snprintf(spoolfile,
2274                                          sizeof spoolfile,
2275                                          "%s/%s",
2276                                          ctdl_netout_dir,
2277                                          node
2278                                 );
2279                                 if (access(spoolfile, R_OK) == 0) {
2280                                         poll = 1;
2281                                 }
2282                         }
2283                         if (poll) {
2284                                 network_poll_node(node, secret, host, port);
2285                         }
2286                 }
2287         }
2288
2289 }
2290
2291
2292
2293
2294 /*
2295  * It's ok if these directories already exist.  Just fail silently.
2296  */
2297 void create_spool_dirs(void) {
2298         if ((mkdir(ctdl_spool_dir, 0700) != 0) && (errno != EEXIST))
2299                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_spool_dir, strerror(errno));
2300         if (chown(ctdl_spool_dir, CTDLUID, (-1)) != 0)
2301                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_spool_dir, strerror(errno));
2302         if ((mkdir(ctdl_netin_dir, 0700) != 0) && (errno != EEXIST))
2303                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_netin_dir, strerror(errno));
2304         if (chown(ctdl_netin_dir, CTDLUID, (-1)) != 0)
2305                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netin_dir, strerror(errno));
2306         if ((mkdir(ctdl_nettmp_dir, 0700) != 0) && (errno != EEXIST))
2307                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_nettmp_dir, strerror(errno));
2308         if (chown(ctdl_nettmp_dir, CTDLUID, (-1)) != 0)
2309                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_nettmp_dir, strerror(errno));
2310         if ((mkdir(ctdl_netout_dir, 0700) != 0) && (errno != EEXIST))
2311                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_netout_dir, strerror(errno));
2312         if (chown(ctdl_netout_dir, CTDLUID, (-1)) != 0)
2313                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netout_dir, strerror(errno));
2314 }
2315
2316
2317
2318
2319
2320 /*
2321  * network_do_queue()
2322  *
2323  * Run through the rooms doing various types of network stuff.
2324  */
2325 void network_do_queue(void) {
2326         static int doing_queue = 0;
2327         static time_t last_run = 0L;
2328         struct RoomProcList *ptr;
2329         int full_processing = 1;
2330
2331         /*
2332          * Run the full set of processing tasks no more frequently
2333          * than once every n seconds
2334          */
2335         if ( (time(NULL) - last_run) < config.c_net_freq ) {
2336                 full_processing = 0;
2337                 syslog(LOG_DEBUG, "Network full processing in %ld seconds.\n",
2338                         config.c_net_freq - (time(NULL)- last_run)
2339                 );
2340         }
2341
2342         /*
2343          * This is a simple concurrency check to make sure only one queue run
2344          * is done at a time.  We could do this with a mutex, but since we
2345          * don't really require extremely fine granularity here, we'll do it
2346          * with a static variable instead.
2347          */
2348         if (doing_queue) {
2349                 return;
2350         }
2351         doing_queue = 1;
2352
2353         /* Load the IGnet Configuration into memory */
2354         load_working_ignetcfg();
2355
2356         /*
2357          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
2358          * then we poll everyone.  Otherwise we only poll nodes we have stuff
2359          * to send to.
2360          */
2361         network_poll_other_citadel_nodes(full_processing);
2362
2363         /*
2364          * Load the network map and filter list into memory.
2365          */
2366         read_network_map();
2367         filterlist = load_filter_list();
2368
2369         /*
2370          * Go ahead and run the queue
2371          */
2372         if (full_processing && !server_shutting_down) {
2373                 syslog(LOG_DEBUG, "network: loading outbound queue\n");
2374                 CtdlForEachRoom(network_queue_room, NULL);
2375         }
2376
2377         if (rplist != NULL) {
2378                 syslog(LOG_DEBUG, "network: running outbound queue\n");
2379                 while (rplist != NULL && !server_shutting_down) {
2380                         char spoolroomname[ROOMNAMELEN];
2381                         safestrncpy(spoolroomname, rplist->name, sizeof spoolroomname);
2382                         begin_critical_section(S_RPLIST);
2383
2384                         /* pop this record off the list */
2385                         ptr = rplist;
2386                         rplist = rplist->next;
2387                         free(ptr);
2388
2389                         /* invalidate any duplicate entries to prevent double processing */
2390                         for (ptr=rplist; ptr!=NULL; ptr=ptr->next) {
2391                                 if (!strcasecmp(ptr->name, spoolroomname)) {
2392                                         ptr->name[0] = 0;
2393                                 }
2394                         }
2395
2396                         end_critical_section(S_RPLIST);
2397                         if (spoolroomname[0] != 0) {
2398                                 network_spoolout_room(spoolroomname);
2399                         }
2400                 }
2401         }
2402
2403         /* If there is anything in the inbound queue, process it */
2404         if (!server_shutting_down) {
2405                 network_do_spoolin();
2406         }
2407
2408         /* Save the network map back to disk */
2409         write_network_map();
2410
2411         /* Free the filter list in memory */
2412         free_filter_list(filterlist);
2413         filterlist = NULL;
2414
2415         network_consolidate_spoolout();
2416
2417         syslog(LOG_DEBUG, "network: queue run completed\n");
2418
2419         if (full_processing) {
2420                 last_run = time(NULL);
2421         }
2422
2423         doing_queue = 0;
2424 }
2425
2426
2427 /*
2428  * cmd_netp() - authenticate to the server as another Citadel node polling
2429  *            for network traffic
2430  */
2431 void cmd_netp(char *cmdbuf)
2432 {
2433         char node[256];
2434         char pass[256];
2435         int v;
2436
2437         char secret[256];
2438         char nexthop[256];
2439         char err_buf[SIZ];
2440
2441         /* Authenticate */
2442         extract_token(node, cmdbuf, 0, '|', sizeof node);
2443         extract_token(pass, cmdbuf, 1, '|', sizeof pass);
2444
2445         /* load the IGnet Configuration to check node validity */
2446         load_working_ignetcfg();
2447         v = is_valid_node(nexthop, secret, node);
2448
2449         if (v != 0) {
2450                 snprintf(err_buf, sizeof err_buf,
2451                         "An unknown Citadel server called \"%s\" attempted to connect from %s [%s].\n",
2452                         node, CC->cs_host, CC->cs_addr
2453                 );
2454                 syslog(LOG_WARNING, "%s", err_buf);
2455                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2456                 CtdlAideMessage(err_buf, "IGNet Networking.");
2457                 return;
2458         }
2459
2460         if (strcasecmp(pass, secret)) {
2461                 snprintf(err_buf, sizeof err_buf,
2462                         "A Citadel server at %s [%s] failed to authenticate as network node \"%s\".\n",
2463                         CC->cs_host, CC->cs_addr, node
2464                 );
2465                 syslog(LOG_WARNING, "%s", err_buf);
2466                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2467                 CtdlAideMessage(err_buf, "IGNet Networking.");
2468                 return;
2469         }
2470
2471         if (network_talking_to(node, NTT_CHECK)) {
2472                 syslog(LOG_WARNING, "Duplicate session for network node <%s>", node);
2473                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
2474                 return;
2475         }
2476
2477         safestrncpy(CC->net_node, node, sizeof CC->net_node);
2478         network_talking_to(node, NTT_ADD);
2479         syslog(LOG_NOTICE, "Network node <%s> logged in from %s [%s]\n",
2480                 CC->net_node, CC->cs_host, CC->cs_addr
2481         );
2482         cprintf("%d authenticated as network node '%s'\n", CIT_OK, CC->net_node);
2483 }
2484
2485
2486 int network_room_handler (struct ctdlroom *room)
2487 {
2488         network_queue_room(room, NULL);
2489         return 0;
2490 }
2491
2492
2493 /*
2494  * Module entry point
2495  */
2496 CTDL_MODULE_INIT(network)
2497 {
2498         if (!threading)
2499         {
2500                 create_spool_dirs();
2501                 CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
2502                 CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
2503                 CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
2504                 CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
2505                 CtdlRegisterRoomHook(network_room_handler);
2506                 CtdlRegisterCleanupHook(destroy_network_queue_room);
2507                 CtdlRegisterSessionHook(network_do_queue, EVT_TIMER);
2508         }
2509         return "network";
2510 }