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