citadel/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) 2000-2002 by Art Cancro and others.
   8  * This code is released under the terms of the GNU General Public License.
   9  *
  10  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  11  * This is a fairly high-level type of critical section.  It ensures that no
  12  * two threads work on the netconfigs files at the same time.  Since we do
  13  * so many things inside these, here are the rules:
  14  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  15  *  2. Do *not* perform any I/O with the client during these sections.
  16  *
  17  */
  18
  19 /*
  20  * Duration of time (in seconds) after which pending list subscribe/unsubscribe
  21  * requests that have not been confirmed will be deleted.
  22  */
  23 #define EXP     259200  /* three days */
  24
  25 #include "sysdep.h"
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <stdio.h>
  29 #include <fcntl.h>
  30 #include <ctype.h>
  31 #include <signal.h>
  32 #include <pwd.h>
  33 #include <errno.h>
  34 #include <sys/stat.h>
  35 #include <sys/types.h>
  36 #include <dirent.h>
  37 #if TIME_WITH_SYS_TIME
  38 # include <sys/time.h>
  39 # include <time.h>
  40 #else
  41 # if HAVE_SYS_TIME_H
  42 #  include <sys/time.h>
  43 # else
  44 #  include <time.h>
  45 # endif
  46 #endif
  47
  48 #include <sys/wait.h>
  49 #include <string.h>
  50 #include <limits.h>
  51 #include "citadel.h"
  52 #include "server.h"
  53 #include "sysdep_decls.h"
  54 #include "citserver.h"
  55 #include "support.h"
  56 #include "config.h"
  57 #include "serv_extensions.h"
  58 #include "room_ops.h"
  59 #include "user_ops.h"
  60 #include "policy.h"
  61 #include "database.h"
  62 #include "msgbase.h"
  63 #include "tools.h"
  64 #include "internet_addressing.h"
  65 #include "serv_network.h"
  66 #include "clientsocket.h"
  67 #include "file_ops.h"
  68
  69 #ifndef HAVE_SNPRINTF
  70 #include "snprintf.h"
  71 #endif
  72
  73 /* Nonzero while we are doing outbound network processing */
  74 static int doing_queue = 0;
  75
  76 /*
  77  * When we do network processing, it's accomplished in two passes; one to
  78  * gather a list of rooms and one to actually do them.  It's ok that rplist
  79  * is global; this process *only* runs as part of the housekeeping loop and
  80  * therefore only one will run at a time.
  81  */
  82 struct RoomProcList *rplist = NULL;
  83
  84 /*
  85  * We build a map of network nodes during processing.
  86  */
  87 struct NetMap *the_netmap = NULL;
  88 int netmap_changed = 0;
  89 char *working_ignetcfg = NULL;
  90
  91 /*
  92  * Load or refresh the Citadel network (IGnet) configuration for this node.
  93  */
  94 void load_working_ignetcfg(void) {
  95         char *cfg;
  96         char *oldcfg;
  97
  98         cfg = CtdlGetSysConfig(IGNETCFG);
  99         if (cfg == NULL) {
 100                 cfg = strdup("");
 101         }
 102
 103         oldcfg = working_ignetcfg;
 104         working_ignetcfg = cfg;
 105         if (oldcfg != NULL) {
 106                 free(oldcfg);
 107         }
 108 }
 109
 110
 111
 112
 113
 114 /*
 115  * Keep track of what messages to reject
 116  */
 117 struct FilterList *load_filter_list(void) {
 118         char *serialized_list = NULL;
 119         int i;
 120         char buf[SIZ];
 121         struct FilterList *newlist = NULL;
 122         struct FilterList *nptr;
 123
 124         serialized_list = CtdlGetSysConfig(FILTERLIST);
 125         if (serialized_list == NULL) return(NULL); /* if null, no entries */
 126
 127         /* Use the string tokenizer to grab one line at a time */
 128         for (i=0; i<num_tokens(serialized_list, '\n'); ++i) {
 129                 extract_token(buf, serialized_list, i, '\n', sizeof buf);
 130                 nptr = (struct FilterList *) malloc(sizeof(struct FilterList));
 131                 extract_token(nptr->fl_user, buf, 0, '|', sizeof nptr->fl_user);
 132                 striplt(nptr->fl_user);
 133                 extract_token(nptr->fl_room, buf, 1, '|', sizeof nptr->fl_room);
 134                 striplt(nptr->fl_room);
 135                 extract_token(nptr->fl_node, buf, 2, '|', sizeof nptr->fl_node);
 136                 striplt(nptr->fl_node);
 137
 138                 /* Cowardly refuse to add an any/any/any entry that would
 139                  * end up filtering every single message.
 140                  */
 141                 if (strlen(nptr->fl_user) + strlen(nptr->fl_room)
 142                    + strlen(nptr->fl_node) == 0) {
 143                         free(nptr);
 144                 }
 145                 else {
 146                         nptr->next = newlist;
 147                         newlist = nptr;
 148                 }
 149         }
 150
 151         free(serialized_list);
 152         return newlist;
 153 }
 154
 155
 156 void free_filter_list(struct FilterList *fl) {
 157         if (fl == NULL) return;
 158         free_filter_list(fl->next);
 159         free(fl);
 160 }
 161
 162
 163
 164 /*
 165  * Check the use table.  This is a list of messages which have recently
 166  * arrived on the system.  It is maintained and queried to prevent the same
 167  * message from being entered into the database multiple times if it happens
 168  * to arrive multiple times by accident.
 169  */
 170 int network_usetable(struct CtdlMessage *msg) {
 171
 172         char msgid[SIZ];
 173         struct cdbdata *cdbut;
 174         struct UseTable ut;
 175
 176         /* Bail out if we can't generate a message ID */
 177         if (msg == NULL) {
 178                 return(0);
 179         }
 180         if (msg->cm_fields['I'] == NULL) {
 181                 return(0);
 182         }
 183         if (strlen(msg->cm_fields['I']) == 0) {
 184                 return(0);
 185         }
 186
 187         /* Generate the message ID */
 188         strcpy(msgid, msg->cm_fields['I']);
 189         if (haschar(msgid, '@') == 0) {
 190                 strcat(msgid, "@");
 191                 if (msg->cm_fields['N'] != NULL) {
 192                         strcat(msgid, msg->cm_fields['N']);
 193                 }
 194                 else {
 195                         return(0);
 196                 }
 197         }
 198
 199         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 200         if (cdbut != NULL) {
 201                 cdb_free(cdbut);
 202                 return(1);
 203         }
 204
 205         /* If we got to this point, it's unique: add it. */
 206         strcpy(ut.ut_msgid, msgid);
 207         ut.ut_timestamp = time(NULL);
 208         cdb_store(CDB_USETABLE, msgid, strlen(msgid),
 209                 &ut, sizeof(struct UseTable) );
 210         return(0);
 211 }
 212
 213
 214 /*
 215  * Read the network map from its configuration file into memory.
 216  */
 217 void read_network_map(void) {
 218         char *serialized_map = NULL;
 219         int i;
 220         char buf[SIZ];
 221         struct NetMap *nmptr;
 222
 223         serialized_map = CtdlGetSysConfig(IGNETMAP);
 224         if (serialized_map == NULL) return;     /* if null, no entries */
 225
 226         /* Use the string tokenizer to grab one line at a time */
 227         for (i=0; i<num_tokens(serialized_map, '\n'); ++i) {
 228                 extract_token(buf, serialized_map, i, '\n', sizeof buf);
 229                 nmptr = (struct NetMap *) malloc(sizeof(struct NetMap));
 230                 extract_token(nmptr->nodename, buf, 0, '|', sizeof nmptr->nodename);
 231                 nmptr->lastcontact = extract_long(buf, 1);
 232                 extract_token(nmptr->nexthop, buf, 2, '|', sizeof nmptr->nexthop);
 233                 nmptr->next = the_netmap;
 234                 the_netmap = nmptr;
 235         }
 236
 237         free(serialized_map);
 238         netmap_changed = 0;
 239 }
 240
 241
 242 /*
 243  * Write the network map from memory back to the configuration file.
 244  */
 245 void write_network_map(void) {
 246         char *serialized_map = NULL;
 247         struct NetMap *nmptr;
 248
 249
 250         if (netmap_changed) {
 251                 serialized_map = strdup("");
 252
 253                 if (the_netmap != NULL) {
 254                         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 255                                 serialized_map = realloc(serialized_map,
 256                                                         (strlen(serialized_map)+SIZ) );
 257                                 if (strlen(nmptr->nodename) > 0) {
 258                                         snprintf(&serialized_map[strlen(serialized_map)],
 259                                                 SIZ,
 260                                                 "%s|%ld|%s\n",
 261                                                 nmptr->nodename,
 262                                                 (long)nmptr->lastcontact,
 263                                                 nmptr->nexthop);
 264                                 }
 265                         }
 266                 }
 267
 268                 CtdlPutSysConfig(IGNETMAP, serialized_map);
 269                 free(serialized_map);
 270         }
 271
 272         /* Now free the list */
 273         while (the_netmap != NULL) {
 274                 nmptr = the_netmap->next;
 275                 free(the_netmap);
 276                 the_netmap = nmptr;
 277         }
 278         netmap_changed = 0;
 279 }
 280
 281
 282
 283 /*
 284  * Check the network map and determine whether the supplied node name is
 285  * valid.  If it is not a neighbor node, supply the name of a neighbor node
 286  * which is the next hop.  If it *is* a neighbor node, we also fill in the
 287  * shared secret.
 288  */
 289 int is_valid_node(char *nexthop, char *secret, char *node) {
 290         int i;
 291         char linebuf[SIZ];
 292         char buf[SIZ];
 293         int retval;
 294         struct NetMap *nmptr;
 295
 296         if (node == NULL) {
 297                 return(-1);
 298         }
 299
 300         /*
 301          * First try the neighbor nodes
 302          */
 303         if (working_ignetcfg == NULL) {
 304                 lprintf(CTDL_ERR, "working_ignetcfg is NULL!\n");
 305                 if (nexthop != NULL) {
 306                         strcpy(nexthop, "");
 307                 }
 308                 return(-1);
 309         }
 310
 311         retval = (-1);
 312         if (nexthop != NULL) {
 313                 strcpy(nexthop, "");
 314         }
 315
 316         /* Use the string tokenizer to grab one line at a time */
 317         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
 318                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
 319                 extract_token(buf, linebuf, 0, '|', sizeof buf);
 320                 if (!strcasecmp(buf, node)) {
 321                         if (nexthop != NULL) {
 322                                 strcpy(nexthop, "");
 323                         }
 324                         if (secret != NULL) {
 325                                 extract_token(secret, linebuf, 1, '|', 256);
 326                         }
 327                         retval = 0;
 328                 }
 329         }
 330
 331         if (retval == 0) {
 332                 return(retval);         /* yup, it's a direct neighbor */
 333         }
 334
 335         /*
 336          * If we get to this point we have to see if we know the next hop
 337          */
 338         if (the_netmap != NULL) {
 339                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 340                         if (!strcasecmp(nmptr->nodename, node)) {
 341                                 if (nexthop != NULL) {
 342                                         strcpy(nexthop, nmptr->nexthop);
 343                                 }
 344                                 return(0);
 345                         }
 346                 }
 347         }
 348
 349         /*
 350          * If we get to this point, the supplied node name is bogus.
 351          */
 352         lprintf(CTDL_ERR, "Invalid node name <%s>\n", node);
 353         return(-1);
 354 }
 355
 356
 357
 358
 359
 360 void cmd_gnet(char *argbuf) {
 361         char filename[SIZ];
 362         char buf[SIZ];
 363         FILE *fp;
 364
 365         if (CtdlAccessCheck(ac_room_aide)) return;
 366         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 367         cprintf("%d Network settings for room #%ld <%s>\n",
 368                 LISTING_FOLLOWS,
 369                 CC->room.QRnumber, CC->room.QRname);
 370
 371         fp = fopen(filename, "r");
 372         if (fp != NULL) {
 373                 while (fgets(buf, sizeof buf, fp) != NULL) {
 374                         buf[strlen(buf)-1] = 0;
 375                         cprintf("%s\n", buf);
 376                 }
 377                 fclose(fp);
 378         }
 379
 380         cprintf("000\n");
 381 }
 382
 383
 384 void cmd_snet(char *argbuf) {
 385         char tempfilename[SIZ];
 386         char filename[SIZ];
 387         char buf[SIZ];
 388         FILE *fp;
 389
 390         unbuffer_output();
 391
 392         if (CtdlAccessCheck(ac_room_aide)) return;
 393         safestrncpy(tempfilename, tmpnam(NULL), sizeof tempfilename);
 394         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 395
 396         fp = fopen(tempfilename, "w");
 397         if (fp == NULL) {
 398                 cprintf("%d Cannot open %s: %s\n",
 399                         ERROR + INTERNAL_ERROR,
 400                         tempfilename,
 401                         strerror(errno));
 402         }
 403
 404         cprintf("%d %s\n", SEND_LISTING, tempfilename);
 405         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 406                 fprintf(fp, "%s\n", buf);
 407         }
 408         fclose(fp);
 409
 410         /* Now copy the temp file to its permanent location
 411          * (We use /bin/mv instead of link() because they may be on
 412          * different filesystems)
 413          */
 414         unlink(filename);
 415         snprintf(buf, sizeof buf, "/bin/mv %s %s", tempfilename, filename);
 416         begin_critical_section(S_NETCONFIGS);
 417         system(buf);
 418         end_critical_section(S_NETCONFIGS);
 419 }
 420
 421
 422 /*
 423  * Spools out one message from the list.
 424  */
 425 void network_spool_msg(long msgnum, void *userdata) {
 426         struct SpoolControl *sc;
 427         int i;
 428         char *newpath = NULL;
 429         size_t instr_len = SIZ;
 430         struct CtdlMessage *msg = NULL;
 431         struct namelist *nptr;
 432         struct maplist *mptr;
 433         struct ser_ret sermsg;
 434         FILE *fp;
 435         char filename[SIZ];
 436         char buf[SIZ];
 437         int bang = 0;
 438         int send = 1;
 439         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 440         int ok_to_participate = 0;
 441         struct recptypes *valid;
 442
 443         sc = (struct SpoolControl *)userdata;
 444
 445         /*
 446          * Process mailing list recipients
 447          */
 448         instr_len = SIZ;
 449         if (sc->listrecps != NULL) {
 450                 /* Fetch the message.  We're going to need to modify it
 451                  * for each recipient in order to satisfy foreign mailers, etc.
 452                  */
 453                 msg = CtdlFetchMessage(msgnum, 1);
 454                 if (msg != NULL) {
 455
 456                         /* Prepend "[List name]" to the subject */
 457                         if (msg->cm_fields['U'] == NULL) {
 458                                 msg->cm_fields['U'] = strdup("(no subject)");
 459                         }
 460                         snprintf(buf, sizeof buf, "[%s] %s", CC->room.QRname, msg->cm_fields['U']);
 461                         free(msg->cm_fields['U']);
 462                         msg->cm_fields['U'] = strdup(buf);
 463
 464                         /* For each recipient... */
 465                         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 466
 467                                 if (msg->cm_fields['R'] == NULL) {
 468                                         free(msg->cm_fields['R']);
 469                                 }
 470                                 msg->cm_fields['R'] = strdup(nptr->name);
 471
 472                                 valid = validate_recipients(nptr->name);
 473                                 CtdlSubmitMsg(msg, valid, "");
 474                                 free(valid);
 475
 476                         }
 477                         CtdlFreeMessage(msg);
 478                 }
 479         }
 480
 481         /*
 482          * Process digest recipients
 483          */
 484         if ((sc->digestrecps != NULL) && (sc->digestfp != NULL)) {
 485                 msg = CtdlFetchMessage(msgnum, 1);
 486                 if (msg != NULL) {
 487                         fprintf(sc->digestfp,   " -----------------------------------"
 488                                                 "------------------------------------"
 489                                                 "-------\n");
 490                         fprintf(sc->digestfp, "From: ");
 491                         if (msg->cm_fields['A'] != NULL) {
 492                                 fprintf(sc->digestfp, "%s ", msg->cm_fields['A']);
 493                         }
 494                         if (msg->cm_fields['F'] != NULL) {
 495                                 fprintf(sc->digestfp, "<%s> ", msg->cm_fields['F']);
 496                         }
 497                         else if (msg->cm_fields['N'] != NULL) {
 498                                 fprintf(sc->digestfp, "@%s ", msg->cm_fields['N']);
 499                         }
 500                         fprintf(sc->digestfp, "\n");
 501                         if (msg->cm_fields['U'] != NULL) {
 502                                 fprintf(sc->digestfp, "Subject: %s\n", msg->cm_fields['U']);
 503                         }
 504
 505                         CC->redirect_buffer = malloc(SIZ);
 506                         CC->redirect_len = 0;
 507                         CC->redirect_alloc = SIZ;
 508
 509                         safestrncpy(CC->preferred_formats, "text/plain", sizeof CC->preferred_formats);
 510                         CtdlOutputPreLoadedMsg(msg, 0L, MT_CITADEL, HEADERS_NONE, 0, 0);
 511
 512                         striplt(CC->redirect_buffer);
 513                         fprintf(sc->digestfp, "\n%s\n", CC->redirect_buffer);
 514
 515                         free(CC->redirect_buffer);
 516                         CC->redirect_buffer = NULL;
 517                         CC->redirect_len = 0;
 518                         CC->redirect_alloc = 0;
 519
 520                         sc->num_msgs_spooled += 1;
 521                         free(msg);
 522                 }
 523         }
 524
 525         /*
 526          * Process client-side list participations for this room
 527          */
 528         instr_len = SIZ;
 529         if (sc->participates != NULL) {
 530                 msg = CtdlFetchMessage(msgnum, 1);
 531                 if (msg != NULL) {
 532
 533                         /* Only send messages which originated on our own Citadel
 534                          * network, otherwise we'll end up sending the remote
 535                          * mailing list's messages back to it, which is rude...
 536                          */
 537                         ok_to_participate = 0;
 538                         if (msg->cm_fields['N'] != NULL) {
 539                                 if (!strcasecmp(msg->cm_fields['N'], config.c_nodename)) {
 540                                         ok_to_participate = 1;
 541                                 }
 542                                 if (is_valid_node(NULL, NULL, msg->cm_fields['N']) == 0) {
 543                                         ok_to_participate = 1;
 544                                 }
 545                         }
 546                         if (ok_to_participate) {
 547                                 if (msg->cm_fields['F'] != NULL) {
 548                                         free(msg->cm_fields['F']);
 549                                 }
 550                                 msg->cm_fields['F'] = malloc(SIZ);
 551                                 /* Replace the Internet email address of the actual
 552                                 * author with the email address of the room itself,
 553                                 * so the remote listserv doesn't reject us.
 554                                 * FIXME ... I want to be able to pick any address
 555                                 */
 556                                 snprintf(msg->cm_fields['F'], SIZ,
 557                                         "room_%s@%s", CC->room.QRname,
 558                                         config.c_fqdn);
 559                                 for (i=0; i<strlen(msg->cm_fields['F']); ++i) {
 560                                         if (isspace(msg->cm_fields['F'][i])) {
 561                                                 msg->cm_fields['F'][i] = '_';
 562                                         }
 563                                 }
 564
 565                                 /*
 566                                  * Figure out how big a buffer we need to allocate
 567                                  */
 568                                 for (nptr = sc->participates; nptr != NULL; nptr = nptr->next) {
 569
 570                                         if (msg->cm_fields['R'] == NULL) {
 571                                                 free(msg->cm_fields['R']);
 572                                         }
 573                                         msg->cm_fields['R'] = strdup(nptr->name);
 574
 575                                         valid = validate_recipients(nptr->name);
 576                                         CtdlSubmitMsg(msg, valid, "");
 577                                         free(valid);
 578                                 }
 579
 580                         }
 581                         CtdlFreeMessage(msg);
 582                 }
 583         }
 584
 585         /*
 586          * Process IGnet push shares
 587          */
 588         if (sc->ignet_push_shares != NULL) {
 589
 590                 msg = CtdlFetchMessage(msgnum, 1);
 591                 if (msg != NULL) {
 592                         size_t newpath_len;
 593
 594                         /* Prepend our node name to the Path field whenever
 595                          * sending a message to another IGnet node
 596                          */
 597                         if (msg->cm_fields['P'] == NULL) {
 598                                 msg->cm_fields['P'] = strdup("username");
 599                         }
 600                         newpath_len = strlen(msg->cm_fields['P']) +
 601                                  strlen(config.c_nodename) + 2;
 602                         newpath = malloc(newpath_len);
 603                         snprintf(newpath, newpath_len, "%s!%s",
 604                                  config.c_nodename, msg->cm_fields['P']);
 605                         free(msg->cm_fields['P']);
 606                         msg->cm_fields['P'] = newpath;
 607
 608                         /*
 609                          * Determine if this message is set to be deleted
 610                          * after sending out on the network
 611                          */
 612                         if (msg->cm_fields['S'] != NULL) {
 613                                 if (!strcasecmp(msg->cm_fields['S'],
 614                                    "CANCEL")) {
 615                                         delete_after_send = 1;
 616                                 }
 617                         }
 618
 619                         /* Now send it to every node */
 620                         for (mptr = sc->ignet_push_shares; mptr != NULL;
 621                             mptr = mptr->next) {
 622
 623                                 send = 1;
 624
 625                                 /* Check for valid node name */
 626                                 if (is_valid_node(NULL, NULL, mptr->remote_nodename) != 0) {
 627                                         lprintf(CTDL_ERR, "Invalid node <%s>\n",
 628                                                 mptr->remote_nodename);
 629                                         send = 0;
 630                                 }
 631
 632                                 /* Check for split horizon */
 633                                 lprintf(CTDL_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 634                                 bang = num_tokens(msg->cm_fields['P'], '!');
 635                                 if (bang > 1) for (i=0; i<(bang-1); ++i) {
 636                                         extract_token(buf, msg->cm_fields['P'],
 637                                                 i, '!', sizeof buf);
 638                                         if (!strcasecmp(buf, mptr->remote_nodename)) {
 639                                                 send = 0;
 640                                         }
 641                                 }
 642
 643                                 /* Send the message */
 644                                 if (send == 1) {
 645
 646                                         /*
 647                                          * Force the message to appear in the correct room
 648                                          * on the far end by setting the C field correctly
 649                                          */
 650                                         if (msg->cm_fields['C'] != NULL) {
 651                                                 free(msg->cm_fields['C']);
 652                                         }
 653                                         if (strlen(mptr->remote_roomname) > 0) {
 654                                                 msg->cm_fields['C'] = strdup(mptr->remote_roomname);
 655                                         }
 656                                         else {
 657                                                 msg->cm_fields['C'] = strdup(CC->room.QRname);
 658                                         }
 659
 660                                         /* serialize it for transmission */
 661                                         serialize_message(&sermsg, msg);
 662
 663                                         /* write it to the spool file */
 664                                         snprintf(filename, sizeof filename,
 665 #ifndef HAVE_SPOOL_DIR
 666                                                          "."
 667 #else
 668                                                          SPOOL_DIR
 669 #endif /* HAVE_SPOOL_DIR */
 670                                                          "/network/spoolout/%s",
 671                                                          mptr->remote_nodename);
 672                                         lprintf(CTDL_DEBUG, "Appending to %s\n", filename);
 673                                         fp = fopen(filename, "ab");
 674                                         if (fp != NULL) {
 675                                                 fwrite(sermsg.ser,
 676                                                         sermsg.len, 1, fp);
 677                                                 fclose(fp);
 678                                         }
 679                                         else {
 680                                                 lprintf(CTDL_ERR, "%s: %s\n", filename, strerror(errno));
 681                                         }
 682
 683                                         /* free the serialized version */
 684                                         free(sermsg.ser);
 685                                 }
 686                         }
 687                         CtdlFreeMessage(msg);
 688                 }
 689         }
 690
 691         /* update lastsent */
 692         sc->lastsent = msgnum;
 693
 694         /* Delete this message if delete-after-send is set */
 695         if (delete_after_send) {
 696                 CtdlDeleteMessages(CC->room.QRname, msgnum, "", 0);
 697         }
 698
 699 }
 700
 701
 702 /*
 703  * Deliver digest messages
 704  */
 705 void network_deliver_digest(struct SpoolControl *sc) {
 706         char buf[SIZ];
 707         int i;
 708         struct CtdlMessage *msg;
 709         long msglen;
 710         long msgnum;
 711         char *instr = NULL;
 712         size_t instr_len = SIZ;
 713         struct CtdlMessage *imsg;
 714         struct namelist *nptr;
 715
 716         if (sc->num_msgs_spooled < 1) {
 717                 fclose(sc->digestfp);
 718                 sc->digestfp = NULL;
 719                 return;
 720         }
 721
 722         msg = malloc(sizeof(struct CtdlMessage));
 723         memset(msg, 0, sizeof(struct CtdlMessage));
 724         msg->cm_magic = CTDLMESSAGE_MAGIC;
 725         msg->cm_format_type = FMT_RFC822;
 726         msg->cm_anon_type = MES_NORMAL;
 727
 728         sprintf(buf, "%ld", time(NULL));
 729         msg->cm_fields['T'] = strdup(buf);
 730         msg->cm_fields['A'] = strdup(CC->room.QRname);
 731         snprintf(buf, sizeof buf, "[%s]", CC->room.QRname);
 732         msg->cm_fields['U'] = strdup(buf);
 733         sprintf(buf, "room_%s@%s", CC->room.QRname, config.c_fqdn);
 734         for (i=0; i<strlen(buf); ++i) {
 735                 if (isspace(buf[i])) buf[i]='_';
 736                 buf[i] = tolower(buf[i]);
 737         }
 738         msg->cm_fields['F'] = strdup(buf);
 739
 740         fseek(sc->digestfp, 0L, SEEK_END);
 741         msglen = ftell(sc->digestfp);
 742
 743         msg->cm_fields['M'] = malloc(msglen + 1);
 744         fseek(sc->digestfp, 0L, SEEK_SET);
 745         fread(msg->cm_fields['M'], (size_t)msglen, 1, sc->digestfp);
 746         msg->cm_fields['M'][msglen] = 0;
 747
 748         fclose(sc->digestfp);
 749         sc->digestfp = NULL;
 750
 751         msgnum = CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM);
 752         CtdlFreeMessage(msg);
 753
 754         /* Now generate the delivery instructions */
 755
 756         /*
 757          * Figure out how big a buffer we need to allocate
 758          */
 759         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 760                 instr_len = instr_len + strlen(nptr->name);
 761         }
 762
 763         /*
 764          * allocate...
 765          */
 766         lprintf(CTDL_DEBUG, "Generating delivery instructions\n");
 767         instr = malloc(instr_len);
 768         if (instr == NULL) {
 769                 lprintf(CTDL_EMERG, "Cannot allocate %ld bytes for instr...\n",
 770                         (long)instr_len);
 771                 abort();
 772         }
 773         snprintf(instr, instr_len,
 774                 "Content-type: %s\n\nmsgid|%ld\nsubmitted|%ld\n"
 775                 "bounceto|postmaster@%s\n" ,
 776                 SPOOLMIME, msgnum, (long)time(NULL), config.c_fqdn );
 777
 778         /* Generate delivery instructions for each recipient */
 779         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 780                 size_t tmp = strlen(instr);
 781                 snprintf(&instr[tmp], instr_len - tmp,
 782                          "remote|%s|0||\n", nptr->name);
 783         }
 784
 785         /*
 786          * Generate a message from the instructions
 787          */
 788         imsg = malloc(sizeof(struct CtdlMessage));
 789         memset(imsg, 0, sizeof(struct CtdlMessage));
 790         imsg->cm_magic = CTDLMESSAGE_MAGIC;
 791         imsg->cm_anon_type = MES_NORMAL;
 792         imsg->cm_format_type = FMT_RFC822;
 793         imsg->cm_fields['A'] = strdup("Citadel");
 794         imsg->cm_fields['M'] = instr;
 795
 796         /* Save delivery instructions in spoolout room */
 797         CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM);
 798         CtdlFreeMessage(imsg);
 799 }
 800
 801
 802 /*
 803  * Batch up and send all outbound traffic from the current room
 804  */
 805 void network_spoolout_room(char *room_to_spool) {
 806         char filename[SIZ];
 807         char buf[SIZ];
 808         char instr[SIZ];
 809         char nodename[256];
 810         char roomname[ROOMNAMELEN];
 811         char nexthop[256];
 812         FILE *fp;
 813         struct SpoolControl sc;
 814         struct namelist *nptr = NULL;
 815         struct maplist *mptr = NULL;
 816         size_t miscsize = 0;
 817         size_t linesize = 0;
 818         int skipthisline = 0;
 819         int i;
 820
 821         if (getroom(&CC->room, room_to_spool) != 0) {
 822                 lprintf(CTDL_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
 823                 return;
 824         }
 825
 826         memset(&sc, 0, sizeof(struct SpoolControl));
 827         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 828
 829         begin_critical_section(S_NETCONFIGS);
 830
 831         fp = fopen(filename, "r");
 832         if (fp == NULL) {
 833                 end_critical_section(S_NETCONFIGS);
 834                 return;
 835         }
 836
 837         lprintf(CTDL_INFO, "Networking started for <%s>\n", CC->room.QRname);
 838
 839         while (fgets(buf, sizeof buf, fp) != NULL) {
 840                 buf[strlen(buf)-1] = 0;
 841
 842                 extract_token(instr, buf, 0, '|', sizeof instr);
 843                 if (!strcasecmp(instr, "lastsent")) {
 844                         sc.lastsent = extract_long(buf, 1);
 845                 }
 846                 else if (!strcasecmp(instr, "listrecp")) {
 847                         nptr = (struct namelist *)
 848                                 malloc(sizeof(struct namelist));
 849                         nptr->next = sc.listrecps;
 850                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 851                         sc.listrecps = nptr;
 852                 }
 853                 else if (!strcasecmp(instr, "participate")) {
 854                         nptr = (struct namelist *)
 855                                 malloc(sizeof(struct namelist));
 856                         nptr->next = sc.participates;
 857                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 858                         sc.participates = nptr;
 859                 }
 860                 else if (!strcasecmp(instr, "digestrecp")) {
 861                         nptr = (struct namelist *)
 862                                 malloc(sizeof(struct namelist));
 863                         nptr->next = sc.digestrecps;
 864                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 865                         sc.digestrecps = nptr;
 866                 }
 867                 else if (!strcasecmp(instr, "ignet_push_share")) {
 868                         /* by checking each node's validity, we automatically
 869                          * purge nodes which do not exist from room network
 870                          * configurations at this time.
 871                          */
 872                         extract_token(nodename, buf, 1, '|', sizeof nodename);
 873                         extract_token(roomname, buf, 2, '|', sizeof roomname);
 874                         strcpy(nexthop, "xxx");
 875                         if (is_valid_node(nexthop, NULL, nodename) == 0) {
 876                                 if (strlen(nexthop) == 0) {
 877                                         mptr = (struct maplist *)
 878                                                 malloc(sizeof(struct maplist));
 879                                         mptr->next = sc.ignet_push_shares;
 880                                         strcpy(mptr->remote_nodename, nodename);
 881                                         strcpy(mptr->remote_roomname, roomname);
 882                                         sc.ignet_push_shares = mptr;
 883                                 }
 884                         }
 885                 }
 886                 else {
 887                         /* Preserve 'other' lines ... *unless* they happen to
 888                          * be subscribe/unsubscribe pendings with expired
 889                          * timestamps.
 890                          */
 891                         skipthisline = 0;
 892                         if (!strncasecmp(buf, "subpending|", 11)) {
 893                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
 894                                         skipthisline = 1;
 895                                 }
 896                         }
 897                         if (!strncasecmp(buf, "unsubpending|", 13)) {
 898                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
 899                                         skipthisline = 1;
 900                                 }
 901                         }
 902
 903                         if (skipthisline == 0) {
 904                                 linesize = strlen(buf);
 905                                 sc.misc = realloc(sc.misc,
 906                                         (miscsize + linesize + 2) );
 907                                 sprintf(&sc.misc[miscsize], "%s\n", buf);
 908                                 miscsize = miscsize + linesize + 1;
 909                         }
 910                 }
 911
 912
 913         }
 914         fclose(fp);
 915
 916         /* If there are digest recipients, we have to build a digest */
 917         if (sc.digestrecps != NULL) {
 918                 sc.digestfp = tmpfile();
 919                 fprintf(sc.digestfp, "Content-type: text/plain\n\n");
 920         }
 921
 922         /* Do something useful */
 923         CtdlForEachMessage(MSGS_GT, sc.lastsent, NULL, NULL,
 924                 network_spool_msg, &sc);
 925
 926         /* If we wrote a digest, deliver it and then close it */
 927         snprintf(buf, sizeof buf, "room_%s@%s",
 928                 CC->room.QRname, config.c_fqdn);
 929         for (i=0; i<strlen(buf); ++i) {
 930                 buf[i] = tolower(buf[i]);
 931                 if (isspace(buf[i])) buf[i] = '_';
 932         }
 933         if (sc.digestfp != NULL) {
 934                 fprintf(sc.digestfp,    " -----------------------------------"
 935                                         "------------------------------------"
 936                                         "-------\n"
 937                                         "You are subscribed to the '%s' "
 938                                         "list.\n"
 939                                         "To post to the list: %s\n",
 940                                         CC->room.QRname, buf
 941                 );
 942                 network_deliver_digest(&sc);    /* deliver and close */
 943         }
 944
 945         /* Now rewrite the config file */
 946         fp = fopen(filename, "w");
 947         if (fp == NULL) {
 948                 lprintf(CTDL_CRIT, "ERROR: cannot open %s: %s\n",
 949                         filename, strerror(errno));
 950         }
 951         else {
 952                 fprintf(fp, "lastsent|%ld\n", sc.lastsent);
 953
 954                 /* Write out the listrecps while freeing from memory at the
 955                  * same time.  Am I clever or what?  :)
 956                  */
 957                 while (sc.listrecps != NULL) {
 958                         fprintf(fp, "listrecp|%s\n", sc.listrecps->name);
 959                         nptr = sc.listrecps->next;
 960                         free(sc.listrecps);
 961                         sc.listrecps = nptr;
 962                 }
 963                 /* Do the same for digestrecps */
 964                 while (sc.digestrecps != NULL) {
 965                         fprintf(fp, "digestrecp|%s\n", sc.digestrecps->name);
 966                         nptr = sc.digestrecps->next;
 967                         free(sc.digestrecps);
 968                         sc.digestrecps = nptr;
 969                 }
 970                 /* Do the same for participates */
 971                 while (sc.participates != NULL) {
 972                         fprintf(fp, "participate|%s\n", sc.participates->name);
 973                         nptr = sc.participates->next;
 974                         free(sc.participates);
 975                         sc.participates = nptr;
 976                 }
 977                 while (sc.ignet_push_shares != NULL) {
 978                         /* by checking each node's validity, we automatically
 979                          * purge nodes which do not exist from room network
 980                          * configurations at this time.
 981                          */
 982                         if (is_valid_node(NULL, NULL, sc.ignet_push_shares->remote_nodename) == 0) {
 983                         }
 984                         fprintf(fp, "ignet_push_share|%s",
 985                                 sc.ignet_push_shares->remote_nodename);
 986                         if (strlen(sc.ignet_push_shares->remote_roomname) > 0) {
 987                                 fprintf(fp, "|%s", sc.ignet_push_shares->remote_roomname);
 988                         }
 989                         fprintf(fp, "\n");
 990                         mptr = sc.ignet_push_shares->next;
 991                         free(sc.ignet_push_shares);
 992                         sc.ignet_push_shares = mptr;
 993                 }
 994                 if (sc.misc != NULL) {
 995                         fwrite(sc.misc, strlen(sc.misc), 1, fp);
 996                 }
 997                 free(sc.misc);
 998
 999                 fclose(fp);
1000         }
1001         end_critical_section(S_NETCONFIGS);
1002 }
1003
1004
1005
1006 /*
1007  * Send the *entire* contents of the current room to one specific network node,
1008  * ignoring anything we know about which messages have already undergone
1009  * network processing.  This can be used to bring a new node into sync.
1010  */
1011 int network_sync_to(char *target_node) {
1012         struct SpoolControl sc;
1013         int num_spooled = 0;
1014         int found_node = 0;
1015         char buf[256];
1016         char sc_type[256];
1017         char sc_node[256];
1018         char sc_room[256];
1019         char filename[256];
1020         FILE *fp;
1021
1022         /* Grab the configuration line we're looking for */
1023         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
1024         begin_critical_section(S_NETCONFIGS);
1025         fp = fopen(filename, "r");
1026         if (fp == NULL) {
1027                 end_critical_section(S_NETCONFIGS);
1028                 return(-1);
1029         }
1030         while (fgets(buf, sizeof buf, fp) != NULL) {
1031                 buf[strlen(buf)-1] = 0;
1032                 extract_token(sc_type, buf, 0, '|', sizeof sc_type);
1033                 extract_token(sc_node, buf, 1, '|', sizeof sc_node);
1034                 extract_token(sc_room, buf, 2, '|', sizeof sc_room);
1035                 if ( (!strcasecmp(sc_type, "ignet_push_share"))
1036                    && (!strcasecmp(sc_node, target_node)) ) {
1037                         found_node = 1;
1038
1039                         /* Concise syntax because we don't need a full linked-list */
1040                         memset(&sc, 0, sizeof(struct SpoolControl));
1041                         sc.ignet_push_shares = (struct maplist *)
1042                                 malloc(sizeof(struct maplist));
1043                         sc.ignet_push_shares->next = NULL;
1044                         safestrncpy(sc.ignet_push_shares->remote_nodename,
1045                                 sc_node,
1046                                 sizeof sc.ignet_push_shares->remote_nodename);
1047                         safestrncpy(sc.ignet_push_shares->remote_roomname,
1048                                 sc_room,
1049                                 sizeof sc.ignet_push_shares->remote_roomname);
1050                 }
1051         }
1052         fclose(fp);
1053         end_critical_section(S_NETCONFIGS);
1054
1055         if (!found_node) return(-1);
1056
1057         /* Send ALL messages */
1058         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL,
1059                 network_spool_msg, &sc);
1060
1061         /* Concise cleanup because we know there's only one node in the sc */
1062         free(sc.ignet_push_shares);
1063
1064         lprintf(CTDL_NOTICE, "Synchronized %d messages to <%s>\n",
1065                 num_spooled, target_node);
1066         return(num_spooled);
1067 }
1068
1069
1070 /*
1071  * Implements the NSYN command
1072  */
1073 void cmd_nsyn(char *argbuf) {
1074         int num_spooled;
1075         char target_node[256];
1076
1077         if (CtdlAccessCheck(ac_aide)) return;
1078
1079         extract_token(target_node, argbuf, 0, '|', sizeof target_node);
1080         num_spooled = network_sync_to(target_node);
1081         if (num_spooled >= 0) {
1082                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
1083         }
1084         else {
1085                 cprintf("%d No such room/node share exists.\n",
1086                         ERROR + ROOM_NOT_FOUND);
1087         }
1088 }
1089
1090
1091
1092 /*
1093  * Batch up and send all outbound traffic from the current room
1094  */
1095 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
1096         struct RoomProcList *ptr;
1097
1098         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
1099         if (ptr == NULL) return;
1100
1101         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
1102         ptr->next = rplist;
1103         rplist = ptr;
1104 }
1105
1106
1107 /*
1108  * Learn topology from path fields
1109  */
1110 void network_learn_topology(char *node, char *path) {
1111         char nexthop[256];
1112         struct NetMap *nmptr;
1113
1114         strcpy(nexthop, "");
1115
1116         if (num_tokens(path, '!') < 3) return;
1117         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
1118                 if (!strcasecmp(nmptr->nodename, node)) {
1119                         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1120                         nmptr->lastcontact = time(NULL);
1121                         ++netmap_changed;
1122                         return;
1123                 }
1124         }
1125
1126         /* If we got here then it's not in the map, so add it. */
1127         nmptr = (struct NetMap *) malloc(sizeof (struct NetMap));
1128         strcpy(nmptr->nodename, node);
1129         nmptr->lastcontact = time(NULL);
1130         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1131         nmptr->next = the_netmap;
1132         the_netmap = nmptr;
1133         ++netmap_changed;
1134 }
1135
1136
1137
1138
1139 /*
1140  * Bounce a message back to the sender
1141  */
1142 void network_bounce(struct CtdlMessage *msg, char *reason) {
1143         char *oldpath = NULL;
1144         char buf[SIZ];
1145         char bouncesource[SIZ];
1146         char recipient[SIZ];
1147         struct recptypes *valid = NULL;
1148         char force_room[ROOMNAMELEN];
1149         static int serialnum = 0;
1150         size_t size;
1151
1152         lprintf(CTDL_DEBUG, "entering network_bounce()\n");
1153
1154         if (msg == NULL) return;
1155
1156         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
1157
1158         /*
1159          * Give it a fresh message ID
1160          */
1161         if (msg->cm_fields['I'] != NULL) {
1162                 free(msg->cm_fields['I']);
1163         }
1164         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
1165                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
1166         msg->cm_fields['I'] = strdup(buf);
1167
1168         /*
1169          * FIXME ... right now we're just sending a bounce; we really want to
1170          * include the text of the bounced message.
1171          */
1172         if (msg->cm_fields['M'] != NULL) {
1173                 free(msg->cm_fields['M']);
1174         }
1175         msg->cm_fields['M'] = strdup(reason);
1176         msg->cm_format_type = 0;
1177
1178         /*
1179          * Turn the message around
1180          */
1181         if (msg->cm_fields['R'] == NULL) {
1182                 free(msg->cm_fields['R']);
1183         }
1184
1185         if (msg->cm_fields['D'] == NULL) {
1186                 free(msg->cm_fields['D']);
1187         }
1188
1189         snprintf(recipient, sizeof recipient, "%s@%s",
1190                 msg->cm_fields['A'], msg->cm_fields['N']);
1191
1192         if (msg->cm_fields['A'] == NULL) {
1193                 free(msg->cm_fields['A']);
1194         }
1195
1196         if (msg->cm_fields['N'] == NULL) {
1197                 free(msg->cm_fields['N']);
1198         }
1199
1200         if (msg->cm_fields['U'] == NULL) {
1201                 free(msg->cm_fields['U']);
1202         }
1203
1204         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1205         msg->cm_fields['N'] = strdup(config.c_nodename);
1206         msg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
1207
1208         /* prepend our node to the path */
1209         if (msg->cm_fields['P'] != NULL) {
1210                 oldpath = msg->cm_fields['P'];
1211                 msg->cm_fields['P'] = NULL;
1212         }
1213         else {
1214                 oldpath = strdup("unknown_user");
1215         }
1216         size = strlen(oldpath) + SIZ;
1217         msg->cm_fields['P'] = malloc(size);
1218         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1219         free(oldpath);
1220
1221         /* Now submit the message */
1222         valid = validate_recipients(recipient);
1223         if (valid != NULL) if (valid->num_error > 0) {
1224                 free(valid);
1225                 valid = NULL;
1226         }
1227         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1228                 strcpy(force_room, config.c_aideroom);
1229         }
1230         else {
1231                 strcpy(force_room, "");
1232         }
1233         if ( (valid == NULL) && (strlen(force_room) == 0) ) {
1234                 strcpy(force_room, config.c_aideroom);
1235         }
1236         CtdlSubmitMsg(msg, valid, force_room);
1237
1238         /* Clean up */
1239         if (valid != NULL) free(valid);
1240         CtdlFreeMessage(msg);
1241         lprintf(CTDL_DEBUG, "leaving network_bounce()\n");
1242 }
1243
1244
1245
1246
1247 /*
1248  * Process a buffer containing a single message from a single file
1249  * from the inbound queue
1250  */
1251 void network_process_buffer(char *buffer, long size) {
1252         struct CtdlMessage *msg;
1253         long pos;
1254         int field;
1255         struct recptypes *recp = NULL;
1256         char target_room[ROOMNAMELEN];
1257         struct ser_ret sermsg;
1258         char *oldpath = NULL;
1259         char filename[SIZ];
1260         FILE *fp;
1261         char nexthop[SIZ];
1262         unsigned char firstbyte;
1263         unsigned char lastbyte;
1264
1265         /* Validate just a little bit.  First byte should be FF and
1266          * last byte should be 00.
1267          */
1268         memcpy(&firstbyte, &buffer[0], 1);
1269         memcpy(&lastbyte, &buffer[size-1], 1);
1270         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1271                 lprintf(CTDL_ERR, "Corrupt message!  Ignoring.\n");
1272                 return;
1273         }
1274
1275         /* Set default target room to trash */
1276         strcpy(target_room, TWITROOM);
1277
1278         /* Load the message into memory */
1279         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1280         memset(msg, 0, sizeof(struct CtdlMessage));
1281         msg->cm_magic = CTDLMESSAGE_MAGIC;
1282         msg->cm_anon_type = buffer[1];
1283         msg->cm_format_type = buffer[2];
1284
1285         for (pos = 3; pos < size; ++pos) {
1286                 field = buffer[pos];
1287                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1288                 pos = pos + strlen(&buffer[(int)pos]);
1289         }
1290
1291         /* Check for message routing */
1292         if (msg->cm_fields['D'] != NULL) {
1293                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1294
1295                         /* route the message */
1296                         strcpy(nexthop, "");
1297                         if (is_valid_node(nexthop, NULL,
1298                            msg->cm_fields['D']) == 0) {
1299
1300                                 /* prepend our node to the path */
1301                                 if (msg->cm_fields['P'] != NULL) {
1302                                         oldpath = msg->cm_fields['P'];
1303                                         msg->cm_fields['P'] = NULL;
1304                                 }
1305                                 else {
1306                                         oldpath = strdup("unknown_user");
1307                                 }
1308                                 size = strlen(oldpath) + SIZ;
1309                                 msg->cm_fields['P'] = malloc(size);
1310                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1311                                         config.c_nodename, oldpath);
1312                                 free(oldpath);
1313
1314                                 /* serialize the message */
1315                                 serialize_message(&sermsg, msg);
1316
1317                                 /* now send it */
1318                                 if (strlen(nexthop) == 0) {
1319                                         strcpy(nexthop, msg->cm_fields['D']);
1320                                 }
1321                                 snprintf(filename, sizeof filename,
1322 #ifndef HAVE_SPOOL_DIR
1323                                                  "."
1324 #else
1325                                                  SPOOL_DIR
1326 #endif /* HAVE_SPOOL_DIR */
1327                                                  "/network/spoolout/%s", nexthop);
1328                                 lprintf(CTDL_DEBUG, "Appending to %s\n", filename);
1329                                 fp = fopen(filename, "ab");
1330                                 if (fp != NULL) {
1331                                         fwrite(sermsg.ser,
1332                                                 sermsg.len, 1, fp);
1333                                         fclose(fp);
1334                                 }
1335                                 else {
1336                                         lprintf(CTDL_ERR, "%s: %s\n", filename, strerror(errno));
1337                                 }
1338                                 free(sermsg.ser);
1339                                 CtdlFreeMessage(msg);
1340                                 return;
1341                         }
1342
1343                         else {  /* invalid destination node name */
1344
1345                                 network_bounce(msg,
1346 "A message you sent could not be delivered due to an invalid destination node"
1347 " name.  Please check the address and try sending the message again.\n");
1348                                 msg = NULL;
1349                                 return;
1350
1351                         }
1352                 }
1353         }
1354
1355         /*
1356          * Check to see if we already have a copy of this message, and
1357          * abort its processing if so.  (We used to post a warning to Aide>
1358          * every time this happened, but the network is now so densely
1359          * connected that it's inevitable.)
1360          */
1361         if (network_usetable(msg) != 0) {
1362                 return;
1363         }
1364
1365         /* Learn network topology from the path */
1366         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1367                 network_learn_topology(msg->cm_fields['N'],
1368                                         msg->cm_fields['P']);
1369         }
1370
1371         /* Is the sending node giving us a very persuasive suggestion about
1372          * which room this message should be saved in?  If so, go with that.
1373          */
1374         if (msg->cm_fields['C'] != NULL) {
1375                 safestrncpy(target_room,
1376                         msg->cm_fields['C'],
1377                         sizeof target_room);
1378         }
1379
1380         /* Otherwise, does it have a recipient?  If so, validate it... */
1381         else if (msg->cm_fields['R'] != NULL) {
1382                 recp = validate_recipients(msg->cm_fields['R']);
1383                 if (recp != NULL) if (recp->num_error > 0) {
1384                         network_bounce(msg,
1385 "A message you sent could not be delivered due to an invalid address.\n"
1386 "Please check the address and try sending the message again.\n");
1387                         msg = NULL;
1388                         free(recp);
1389                         return;
1390                 }
1391                 strcpy(target_room, "");        /* no target room if mail */
1392         }
1393
1394         /* Our last shot at finding a home for this message is to see if
1395          * it has the O field (Originating room) set.
1396          */
1397         else if (msg->cm_fields['O'] != NULL) {
1398                 safestrncpy(target_room,
1399                         msg->cm_fields['O'],
1400                         sizeof target_room);
1401         }
1402
1403         /* Strip out fields that are only relevant during transit */
1404         if (msg->cm_fields['D'] != NULL) {
1405                 free(msg->cm_fields['D']);
1406                 msg->cm_fields['D'] = NULL;
1407         }
1408         if (msg->cm_fields['C'] != NULL) {
1409                 free(msg->cm_fields['C']);
1410                 msg->cm_fields['C'] = NULL;
1411         }
1412
1413         /* save the message into a room */
1414         if (PerformNetprocHooks(msg, target_room) == 0) {
1415                 msg->cm_flags = CM_SKIP_HOOKS;
1416                 CtdlSubmitMsg(msg, recp, target_room);
1417         }
1418         CtdlFreeMessage(msg);
1419         free(recp);
1420 }
1421
1422
1423 /*
1424  * Process a single message from a single file from the inbound queue
1425  */
1426 void network_process_message(FILE *fp, long msgstart, long msgend) {
1427         long hold_pos;
1428         long size;
1429         char *buffer;
1430
1431         hold_pos = ftell(fp);
1432         size = msgend - msgstart + 1;
1433         buffer = malloc(size);
1434         if (buffer != NULL) {
1435                 fseek(fp, msgstart, SEEK_SET);
1436                 fread(buffer, size, 1, fp);
1437                 network_process_buffer(buffer, size);
1438                 free(buffer);
1439         }
1440
1441         fseek(fp, hold_pos, SEEK_SET);
1442 }
1443
1444
1445 /*
1446  * Process a single file from the inbound queue
1447  */
1448 void network_process_file(char *filename) {
1449         FILE *fp;
1450         long msgstart = (-1L);
1451         long msgend = (-1L);
1452         long msgcur = 0L;
1453         int ch;
1454
1455
1456         fp = fopen(filename, "rb");
1457         if (fp == NULL) {
1458                 lprintf(CTDL_CRIT, "Error opening %s: %s\n",
1459                         filename, strerror(errno));
1460                 return;
1461         }
1462
1463         lprintf(CTDL_INFO, "network: processing <%s>\n", filename);
1464
1465         /* Look for messages in the data stream and break them out */
1466         while (ch = getc(fp), ch >= 0) {
1467
1468                 if (ch == 255) {
1469                         if (msgstart >= 0L) {
1470                                 msgend = msgcur - 1;
1471                                 network_process_message(fp, msgstart, msgend);
1472                         }
1473                         msgstart = msgcur;
1474                 }
1475
1476                 ++msgcur;
1477         }
1478
1479         msgend = msgcur - 1;
1480         if (msgstart >= 0L) {
1481                 network_process_message(fp, msgstart, msgend);
1482         }
1483
1484         fclose(fp);
1485         unlink(filename);
1486 }
1487
1488
1489 /*
1490  * Process anything in the inbound queue
1491  */
1492 void network_do_spoolin(void) {
1493         DIR *dp;
1494         struct dirent *d;
1495         char filename[256];
1496
1497         dp = opendir(
1498 #ifndef HAVE_SPOOL_DIR
1499                                  "."
1500 #else
1501                                  SPOOL_DIR
1502 #endif /* HAVE_SPOOL_DIR */
1503                                  "/network/spoolin");
1504         if (dp == NULL) return;
1505
1506         while (d = readdir(dp), d != NULL) {
1507                 if ((strcmp(d->d_name, ".")) && (strcmp(d->d_name, ".."))) {
1508                         snprintf(filename, sizeof filename,
1509 #ifndef HAVE_SPOOL_DIR
1510                                          "."
1511 #else
1512                                          SPOOL_DIR
1513 #endif /* HAVE_SPOOL_DIR */
1514                                          "/network/spoolin/%s", d->d_name);
1515                         network_process_file(filename);
1516                 }
1517         }
1518
1519         closedir(dp);
1520 }
1521
1522 /*
1523  * Delete any files in the outbound queue that were intended
1524  * to be sent to nodes which no longer exist.
1525  */
1526 void network_purge_spoolout(void) {
1527         DIR *dp;
1528         struct dirent *d;
1529         char filename[256];
1530         char nexthop[256];
1531         int i;
1532
1533         dp = opendir(
1534 #ifndef HAVE_SPOOL_DIR
1535                                  "."
1536 #else
1537                                  SPOOL_DIR
1538 #endif /* HAVE_SPOOL_DIR */
1539                                  "/network/spoolout");
1540         if (dp == NULL) return;
1541
1542         while (d = readdir(dp), d != NULL) {
1543                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
1544                         continue;
1545                 snprintf(filename, sizeof filename,
1546 #ifndef HAVE_SPOOL_DIR
1547                                  "."
1548 #else
1549                                  SPOOL_DIR
1550 #endif /* HAVE_SPOOL_DIR */
1551                                  "/network/spoolout/%s", d->d_name);
1552
1553                 strcpy(nexthop, "");
1554                 i = is_valid_node(nexthop, NULL, d->d_name);
1555
1556                 if ( (i != 0) || (strlen(nexthop) > 0) ) {
1557                         unlink(filename);
1558                 }
1559         }
1560
1561
1562         closedir(dp);
1563 }
1564
1565
1566 /*
1567  * receive network spool from the remote system
1568  */
1569 void receive_spool(int sock, char *remote_nodename) {
1570         long download_len;
1571         long bytes_received;
1572         char buf[SIZ];
1573         static char pbuf[IGNET_PACKET_SIZE];
1574         char tempfilename[PATH_MAX];
1575         long plen;
1576         FILE *fp;
1577
1578         strcpy(tempfilename, tmpnam(NULL));
1579         if (sock_puts(sock, "NDOP") < 0) return;
1580         if (sock_gets(sock, buf) < 0) return;
1581         lprintf(CTDL_DEBUG, "<%s\n", buf);
1582         if (buf[0] != '2') {
1583                 return;
1584         }
1585         download_len = extract_long(&buf[4], 0);
1586
1587         bytes_received = 0L;
1588         fp = fopen(tempfilename, "w");
1589         if (fp == NULL) {
1590                 lprintf(CTDL_CRIT, "cannot open download file locally: %s\n",
1591                         strerror(errno));
1592                 return;
1593         }
1594
1595         while (bytes_received < download_len) {
1596                 snprintf(buf, sizeof buf, "READ %ld|%ld",
1597                         bytes_received,
1598                      ((download_len - bytes_received > IGNET_PACKET_SIZE)
1599                  ? IGNET_PACKET_SIZE : (download_len - bytes_received)));
1600                 if (sock_puts(sock, buf) < 0) {
1601                         fclose(fp);
1602                         unlink(tempfilename);
1603                         return;
1604                 }
1605                 if (sock_gets(sock, buf) < 0) {
1606                         fclose(fp);
1607                         unlink(tempfilename);
1608                         return;
1609                 }
1610                 if (buf[0] == '6') {
1611                         plen = extract_long(&buf[4], 0);
1612                         if (sock_read(sock, pbuf, plen) < 0) {
1613                                 fclose(fp);
1614                                 unlink(tempfilename);
1615                                 return;
1616                         }
1617                         fwrite((char *) pbuf, plen, 1, fp);
1618                         bytes_received = bytes_received + plen;
1619                 }
1620         }
1621
1622         fclose(fp);
1623         if (sock_puts(sock, "CLOS") < 0) {
1624                 unlink(tempfilename);
1625                 return;
1626         }
1627         if (sock_gets(sock, buf) < 0) {
1628                 unlink(tempfilename);
1629                 return;
1630         }
1631         if (download_len > 0)
1632                 lprintf(CTDL_NOTICE, "Received %ld octets from <%s>",
1633                                 download_len, remote_nodename);
1634         lprintf(CTDL_DEBUG, "%s", buf);
1635         /* TODO: make move inline. forking is verry expensive. */
1636         snprintf(buf, sizeof buf, "mv %s "
1637 #ifndef HAVE_SPOOL_DIR
1638                          "."
1639 #else
1640                          SPOOL_DIR
1641 #endif /* HAVE_SPOOL_DIR */
1642                          "/network/spoolin/%s.%ld",
1643                          tempfilename, remote_nodename, (long) getpid());
1644         system(buf);
1645 }
1646
1647
1648
1649 /*
1650  * transmit network spool to the remote system
1651  */
1652 void transmit_spool(int sock, char *remote_nodename)
1653 {
1654         char buf[SIZ];
1655         char pbuf[4096];
1656         long plen;
1657         long bytes_to_write, thisblock, bytes_written;
1658         int fd;
1659         char sfname[128];
1660
1661         if (sock_puts(sock, "NUOP") < 0) return;
1662         if (sock_gets(sock, buf) < 0) return;
1663         lprintf(CTDL_DEBUG, "<%s\n", buf);
1664         if (buf[0] != '2') {
1665                 return;
1666         }
1667
1668         snprintf(sfname, sizeof sfname,
1669 #ifndef HAVE_SPOOL_DIR
1670                          "."
1671 #else
1672                          SPOOL_DIR
1673 #endif /* HAVE_SPOOL_DIR */
1674                          "/network/spoolout/%s", remote_nodename);
1675         fd = open(sfname, O_RDONLY);
1676         if (fd < 0) {
1677                 if (errno != ENOENT) {
1678                         lprintf(CTDL_CRIT, "cannot open upload file locally: %s\n",
1679                                 strerror(errno));
1680                 }
1681                 return;
1682         }
1683         bytes_written = 0;
1684         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
1685                 bytes_to_write = plen;
1686                 while (bytes_to_write > 0L) {
1687                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
1688                         if (sock_puts(sock, buf) < 0) {
1689                                 close(fd);
1690                                 return;
1691                         }
1692                         if (sock_gets(sock, buf) < 0) {
1693                                 close(fd);
1694                                 return;
1695                         }
1696                         thisblock = atol(&buf[4]);
1697                         if (buf[0] == '7') {
1698                                 if (sock_write(sock, pbuf,
1699                                    (int) thisblock) < 0) {
1700                                         close(fd);
1701                                         return;
1702                                 }
1703                                 bytes_to_write -= thisblock;
1704                                 bytes_written += thisblock;
1705                         } else {
1706                                 goto ABORTUPL;
1707                         }
1708                 }
1709         }
1710
1711 ABORTUPL:
1712         close(fd);
1713         if (sock_puts(sock, "UCLS 1") < 0) return;
1714         if (sock_gets(sock, buf) < 0) return;
1715         lprintf(CTDL_NOTICE, "Sent %ld octets to <%s>\n",
1716                         bytes_written, remote_nodename);
1717         lprintf(CTDL_DEBUG, "<%s\n", buf);
1718         if (buf[0] == '2') {
1719                 lprintf(CTDL_DEBUG, "Removing <%s>\n", sfname);
1720                 unlink(sfname);
1721         }
1722 }
1723
1724
1725
1726 /*
1727  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
1728  */
1729 void network_poll_node(char *node, char *secret, char *host, char *port) {
1730         int sock;
1731         char buf[SIZ];
1732
1733         if (network_talking_to(node, NTT_CHECK)) return;
1734         network_talking_to(node, NTT_ADD);
1735         lprintf(CTDL_NOTICE, "Connecting to <%s> at %s:%s\n", node, host, port);
1736
1737         sock = sock_connect(host, port, "tcp");
1738         if (sock < 0) {
1739                 lprintf(CTDL_ERR, "Could not connect: %s\n", strerror(errno));
1740                 network_talking_to(node, NTT_REMOVE);
1741                 return;
1742         }
1743
1744         lprintf(CTDL_DEBUG, "Connected!\n");
1745
1746         /* Read the server greeting */
1747         if (sock_gets(sock, buf) < 0) goto bail;
1748         lprintf(CTDL_DEBUG, ">%s\n", buf);
1749
1750         /* Identify ourselves */
1751         snprintf(buf, sizeof buf, "NETP %s|%s", config.c_nodename, secret);
1752         lprintf(CTDL_DEBUG, "<%s\n", buf);
1753         if (sock_puts(sock, buf) <0) goto bail;
1754         if (sock_gets(sock, buf) < 0) goto bail;
1755         lprintf(CTDL_DEBUG, ">%s\n", buf);
1756         if (buf[0] != '2') goto bail;
1757
1758         /* At this point we are authenticated. */
1759         receive_spool(sock, node);
1760         transmit_spool(sock, node);
1761
1762         sock_puts(sock, "QUIT");
1763 bail:   sock_close(sock);
1764         network_talking_to(node, NTT_REMOVE);
1765 }
1766
1767
1768
1769 /*
1770  * Poll other Citadel nodes and transfer inbound/outbound network data.
1771  * Set "full" to nonzero to force a poll of every node, or to zero to poll
1772  * only nodes to which we have data to send.
1773  */
1774 void network_poll_other_citadel_nodes(int full_poll) {
1775         int i;
1776         char linebuf[256];
1777         char node[SIZ];
1778         char host[256];
1779         char port[256];
1780         char secret[256];
1781         int poll = 0;
1782         char spoolfile[256];
1783
1784         if (working_ignetcfg == NULL) {
1785                 lprintf(CTDL_DEBUG, "No nodes defined - not polling\n");
1786                 return;
1787         }
1788
1789         /* Use the string tokenizer to grab one line at a time */
1790         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
1791                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
1792                 extract_token(node, linebuf, 0, '|', sizeof node);
1793                 extract_token(secret, linebuf, 1, '|', sizeof secret);
1794                 extract_token(host, linebuf, 2, '|', sizeof host);
1795                 extract_token(port, linebuf, 3, '|', sizeof port);
1796                 if ( (strlen(node) > 0) && (strlen(secret) > 0)
1797                    && (strlen(host) > 0) && strlen(port) > 0) {
1798                         poll = full_poll;
1799                         if (poll == 0) {
1800                                 snprintf(spoolfile, sizeof spoolfile,
1801 #ifndef HAVE_SPOOL_DIR
1802                                                  "."
1803 #else
1804                                                  SPOOL_DIR
1805 #endif
1806                                                  "/network/spoolout/%s", node);
1807                                 if (access(spoolfile, R_OK) == 0) {
1808                                         poll = 1;
1809                                 }
1810                         }
1811                         if (poll) {
1812                                 network_poll_node(node, secret, host, port);
1813                         }
1814                 }
1815         }
1816
1817 }
1818
1819
1820
1821
1822 /*
1823  * It's ok if these directories already exist.  Just fail silently.
1824  */
1825 void create_spool_dirs(void) {
1826 #ifndef HAVE_SPOOL_DIR
1827         mkdir("./network", 0700);
1828         mkdir("./network/systems", 0700);
1829         mkdir("./network/spoolin", 0700);
1830         mkdir("./network/spoolout", 0700);
1831 #else
1832         mkdir(SPOOL_DIR "/network", 0700);
1833         mkdir(SPOOL_DIR "/network/systems", 0700);
1834         mkdir(SPOOL_DIR "/network/spoolin", 0700);
1835         mkdir(SPOOL_DIR "/network/spoolout", 0700);
1836 #endif /* HAVE_SPOOL_DIR */
1837 }
1838
1839
1840
1841
1842
1843 /*
1844  * network_do_queue()
1845  *
1846  * Run through the rooms doing various types of network stuff.
1847  */
1848 void network_do_queue(void) {
1849         static time_t last_run = 0L;
1850         struct RoomProcList *ptr;
1851         int full_processing = 1;
1852
1853         /*
1854          * Run the full set of processing tasks no more frequently
1855          * than once every n seconds
1856          */
1857         if ( (time(NULL) - last_run) < config.c_net_freq ) {
1858                 full_processing = 0;
1859         }
1860
1861         create_spool_dirs();
1862
1863         /*
1864          * This is a simple concurrency check to make sure only one queue run
1865          * is done at a time.  We could do this with a mutex, but since we
1866          * don't really require extremely fine granularity here, we'll do it
1867          * with a static variable instead.
1868          */
1869         if (doing_queue) return;
1870         doing_queue = 1;
1871
1872         /* Load the IGnet Configuration into memory */
1873         load_working_ignetcfg();
1874
1875         /*
1876          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
1877          * then we poll everyone.  Otherwise we only poll nodes we have stuff
1878          * to send to.
1879          */
1880         network_poll_other_citadel_nodes(full_processing);
1881
1882         /*
1883          * Load the network map and filter list into memory.
1884          */
1885         read_network_map();
1886         filterlist = load_filter_list();
1887
1888         /*
1889          * Go ahead and run the queue
1890          */
1891         if (full_processing) {
1892                 lprintf(CTDL_DEBUG, "network: loading outbound queue\n");
1893                 ForEachRoom(network_queue_room, NULL);
1894
1895                 lprintf(CTDL_DEBUG, "network: running outbound queue\n");
1896                 while (rplist != NULL) {
1897                         network_spoolout_room(rplist->name);
1898                         ptr = rplist;
1899                         rplist = rplist->next;
1900                         free(ptr);
1901                 }
1902         }
1903
1904         lprintf(CTDL_DEBUG, "network: processing inbound queue\n");
1905         network_do_spoolin();
1906
1907         /* Save the network map back to disk */
1908         write_network_map();
1909
1910         /* Free the filter list in memory */
1911         free_filter_list(filterlist);
1912         filterlist = NULL;
1913
1914         network_purge_spoolout();
1915
1916         lprintf(CTDL_DEBUG, "network: queue run completed\n");
1917
1918         if (full_processing) {
1919                 last_run = time(NULL);
1920         }
1921
1922         doing_queue = 0;
1923 }
1924
1925
1926 /*
1927  * cmd_netp() - authenticate to the server as another Citadel node polling
1928  *            for network traffic
1929  */
1930 void cmd_netp(char *cmdbuf)
1931 {
1932         char node[256];
1933         char pass[256];
1934         int v;
1935
1936         char secret[256];
1937         char nexthop[256];
1938
1939         /* Authenticate */
1940         extract_token(node, cmdbuf, 0, '|', sizeof node);
1941         extract_token(pass, cmdbuf, 1, '|', sizeof pass);
1942
1943         if (doing_queue) {
1944                 lprintf(CTDL_WARNING, "Network node <%s> refused - spooling", node);
1945                 cprintf("%d spooling - try again in a few minutes\n",
1946                         ERROR + RESOURCE_BUSY);
1947                 return;
1948         }
1949
1950         /* load the IGnet Configuration to check node validity */
1951         load_working_ignetcfg();
1952         v = is_valid_node(nexthop, secret, node);
1953
1954         if (v != 0) {
1955                 lprintf(CTDL_WARNING, "Unknown node <%s>\n", node);
1956                 cprintf("%d authentication failed\n",
1957                         ERROR + PASSWORD_REQUIRED);
1958                 return;
1959         }
1960
1961         if (strcasecmp(pass, secret)) {
1962                 lprintf(CTDL_WARNING, "Bad password for network node <%s>", node);
1963                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
1964                 return;
1965         }
1966
1967         if (network_talking_to(node, NTT_CHECK)) {
1968                 lprintf(CTDL_WARNING, "Duplicate session for network node <%s>", node);
1969                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
1970                 return;
1971         }
1972
1973         safestrncpy(CC->net_node, node, sizeof CC->net_node);
1974         network_talking_to(node, NTT_ADD);
1975         lprintf(CTDL_NOTICE, "Network node <%s> logged in\n", CC->net_node);
1976         cprintf("%d authenticated as network node '%s'\n", CIT_OK,
1977                 CC->net_node);
1978 }
1979
1980 /*
1981  * Module entry point
1982  */
1983 char *serv_network_init(void)
1984 {
1985         create_spool_dirs();
1986         CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
1987         CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
1988         CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
1989         CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
1990         CtdlRegisterSessionHook(network_do_queue, EVT_TIMER);
1991         return "$Id$";
1992 }