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