citadel/modules/network/serv_network.c

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