citadel/serv_network.c

   1 /*
   2  * $Id$
   3  *
   4  * This module handles shared rooms, inter-Citadel mail, and outbound
   5  * mailing list processing.
   6  *
   7  * Copyright (C) 2000-2002 by Art Cancro and others.
   8  * This code is released under the terms of the GNU General Public License.
   9  *
  10  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  11  * This is a fairly high-level type of critical section.  It ensures that no
  12  * two threads work on the netconfigs files at the same time.  Since we do
  13  * so many things inside these, here are the rules:
  14  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  15  *  2. Do *not* perform any I/O with the client during these sections.
  16  *
  17  */
  18
  19 /*
  20  * Duration of time (in seconds) after which pending list subscribe/unsubscribe
  21  * requests that have not been confirmed will be deleted.
  22  */
  23 #define EXP     259200  /* three days */
  24
  25 #include "sysdep.h"
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <stdio.h>
  29 #include <fcntl.h>
  30 #include <ctype.h>
  31 #include <signal.h>
  32 #include <pwd.h>
  33 #include <errno.h>
  34 #include <sys/types.h>
  35 #include <dirent.h>
  36 #if TIME_WITH_SYS_TIME
  37 # include <sys/time.h>
  38 # include <time.h>
  39 #else
  40 # if HAVE_SYS_TIME_H
  41 #  include <sys/time.h>
  42 # else
  43 #  include <time.h>
  44 # endif
  45 #endif
  46
  47 #include <sys/wait.h>
  48 #include <string.h>
  49 #include <limits.h>
  50 #include "citadel.h"
  51 #include "server.h"
  52 #include "sysdep_decls.h"
  53 #include "citserver.h"
  54 #include "support.h"
  55 #include "config.h"
  56 #include "serv_extensions.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 "tools.h"
  63 #include "internet_addressing.h"
  64 #include "serv_network.h"
  65 #include "clientsocket.h"
  66 #include "file_ops.h"
  67
  68 #ifndef HAVE_SNPRINTF
  69 #include "snprintf.h"
  70 #endif
  71
  72 /* Nonzero while we are doing outbound network processing */
  73 static int doing_queue = 0;
  74
  75 /*
  76  * When we do network processing, it's accomplished in two passes; one to
  77  * gather a list of rooms and one to actually do them.  It's ok that rplist
  78  * is global; this process *only* runs as part of the housekeeping loop and
  79  * therefore only one will run at a time.
  80  */
  81 struct RoomProcList *rplist = NULL;
  82
  83 /*
  84  * We build a map of network nodes during processing.
  85  */
  86 struct NetMap *the_netmap = NULL;
  87 char *working_ignetcfg = NULL;
  88
  89 /*
  90  * Keep track of what messages to reject
  91  */
  92 struct FilterList *load_filter_list(void) {
  93         char *serialized_list = NULL;
  94         int i;
  95         char buf[SIZ];
  96         struct FilterList *newlist = NULL;
  97         struct FilterList *nptr;
  98
  99         serialized_list = CtdlGetSysConfig(FILTERLIST);
 100         if (serialized_list == NULL) return(NULL); /* if null, no entries */
 101
 102         /* Use the string tokenizer to grab one line at a time */
 103         for (i=0; i<num_tokens(serialized_list, '\n'); ++i) {
 104                 extract_token(buf, serialized_list, i, '\n');
 105                 nptr = (struct FilterList *) malloc(sizeof(struct FilterList));
 106                 extract(nptr->fl_user, buf, 0);
 107                 striplt(nptr->fl_user);
 108                 extract(nptr->fl_room, buf, 1);
 109                 striplt(nptr->fl_room);
 110                 extract(nptr->fl_node, buf, 2);
 111                 striplt(nptr->fl_node);
 112
 113                 /* Cowardly refuse to add an any/any/any entry that would
 114                  * end up filtering every single message.
 115                  */
 116                 if (strlen(nptr->fl_user) + strlen(nptr->fl_room)
 117                    + strlen(nptr->fl_node) == 0) {
 118                         free(nptr);
 119                 }
 120                 else {
 121                         nptr->next = newlist;
 122                         newlist = nptr;
 123                 }
 124         }
 125
 126         free(serialized_list);
 127         return newlist;
 128 }
 129
 130
 131 void free_filter_list(struct FilterList *fl) {
 132         if (fl == NULL) return;
 133         free_filter_list(fl->next);
 134         free(fl);
 135 }
 136
 137
 138
 139 /*
 140  * Check the use table.  This is a list of messages which have recently
 141  * arrived on the system.  It is maintained and queried to prevent the same
 142  * message from being entered into the database multiple times if it happens
 143  * to arrive multiple times by accident.
 144  */
 145 int network_usetable(struct CtdlMessage *msg) {
 146
 147         char msgid[SIZ];
 148         struct cdbdata *cdbut;
 149         struct UseTable ut;
 150
 151         /* Bail out if we can't generate a message ID */
 152         if (msg == NULL) {
 153                 return(0);
 154         }
 155         if (msg->cm_fields['I'] == NULL) {
 156                 return(0);
 157         }
 158         if (strlen(msg->cm_fields['I']) == 0) {
 159                 return(0);
 160         }
 161
 162         /* Generate the message ID */
 163         strcpy(msgid, msg->cm_fields['I']);
 164         if (haschar(msgid, '@') == 0) {
 165                 strcat(msgid, "@");
 166                 if (msg->cm_fields['N'] != NULL) {
 167                         strcat(msgid, msg->cm_fields['N']);
 168                 }
 169                 else {
 170                         return(0);
 171                 }
 172         }
 173
 174         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 175         if (cdbut != NULL) {
 176                 cdb_free(cdbut);
 177                 return(1);
 178         }
 179
 180         /* If we got to this point, it's unique: add it. */
 181         strcpy(ut.ut_msgid, msgid);
 182         ut.ut_timestamp = time(NULL);
 183         cdb_store(CDB_USETABLE, msgid, strlen(msgid),
 184                 &ut, sizeof(struct UseTable) );
 185         return(0);
 186 }
 187
 188
 189 /*
 190  * Read the network map from its configuration file into memory.
 191  */
 192 void read_network_map(void) {
 193         char *serialized_map = NULL;
 194         int i;
 195         char buf[SIZ];
 196         struct NetMap *nmptr;
 197
 198         serialized_map = CtdlGetSysConfig(IGNETMAP);
 199         if (serialized_map == NULL) return;     /* if null, no entries */
 200
 201         /* Use the string tokenizer to grab one line at a time */
 202         for (i=0; i<num_tokens(serialized_map, '\n'); ++i) {
 203                 extract_token(buf, serialized_map, i, '\n');
 204                 nmptr = (struct NetMap *) malloc(sizeof(struct NetMap));
 205                 extract(nmptr->nodename, buf, 0);
 206                 nmptr->lastcontact = extract_long(buf, 1);
 207                 extract(nmptr->nexthop, buf, 2);
 208                 nmptr->next = the_netmap;
 209                 the_netmap = nmptr;
 210         }
 211
 212         free(serialized_map);
 213 }
 214
 215
 216 /*
 217  * Write the network map from memory back to the configuration file.
 218  */
 219 void write_network_map(void) {
 220         char *serialized_map = NULL;
 221         struct NetMap *nmptr;
 222
 223         serialized_map = strdup("");
 224
 225         if (the_netmap != NULL) {
 226                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 227                         serialized_map = realloc(serialized_map,
 228                                                 (strlen(serialized_map)+SIZ) );
 229                         if (strlen(nmptr->nodename) > 0) {
 230                                 snprintf(&serialized_map[strlen(serialized_map)],
 231                                         SIZ,
 232                                         "%s|%ld|%s\n",
 233                                         nmptr->nodename,
 234                                         (long)nmptr->lastcontact,
 235                                         nmptr->nexthop);
 236                         }
 237                 }
 238         }
 239
 240         CtdlPutSysConfig(IGNETMAP, serialized_map);
 241         free(serialized_map);
 242
 243         /* Now free the list */
 244         while (the_netmap != NULL) {
 245                 nmptr = the_netmap->next;
 246                 free(the_netmap);
 247                 the_netmap = nmptr;
 248         }
 249 }
 250
 251
 252
 253 /*
 254  * Check the network map and determine whether the supplied node name is
 255  * valid.  If it is not a neighbor node, supply the name of a neighbor node
 256  * which is the next hop.  If it *is* a neighbor node, we also fill in the
 257  * shared secret.
 258  */
 259 int is_valid_node(char *nexthop, char *secret, char *node) {
 260         int i;
 261         char linebuf[SIZ];
 262         char buf[SIZ];
 263         int retval;
 264         struct NetMap *nmptr;
 265
 266         if (node == NULL) {
 267                 return(-1);
 268         }
 269
 270         /*
 271          * First try the neighbor nodes
 272          */
 273         if (working_ignetcfg == NULL) {
 274                 lprintf(CTDL_ERR, "working_ignetcfg is NULL!");
 275                 if (nexthop != NULL) {
 276                         strcpy(nexthop, "");
 277                 }
 278                 return(-1);
 279         }
 280
 281         retval = (-1);
 282         if (nexthop != NULL) {
 283                 strcpy(nexthop, "");
 284         }
 285
 286         /* Use the string tokenizer to grab one line at a time */
 287         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
 288                 extract_token(linebuf, working_ignetcfg, i, '\n');
 289                 extract(buf, linebuf, 0);
 290                 if (!strcasecmp(buf, node)) {
 291                         if (nexthop != NULL) {
 292                                 strcpy(nexthop, "");
 293                         }
 294                         if (secret != NULL) {
 295                                 extract(secret, linebuf, 1);
 296                         }
 297                         retval = 0;
 298                 }
 299         }
 300
 301         if (retval == 0) {
 302                 return(retval);         /* yup, it's a direct neighbor */
 303         }
 304
 305         /*
 306          * If we get to this point we have to see if we know the next hop
 307          */
 308         if (the_netmap != NULL) {
 309                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 310                         if (!strcasecmp(nmptr->nodename, node)) {
 311                                 if (nexthop != NULL) {
 312                                         strcpy(nexthop, nmptr->nexthop);
 313                                 }
 314                                 return(0);
 315                         }
 316                 }
 317         }
 318
 319         /*
 320          * If we get to this point, the supplied node name is bogus.
 321          */
 322         lprintf(CTDL_ERR, "Invalid node name <%s>\n", node);
 323         return(-1);
 324 }
 325
 326
 327
 328
 329
 330 void cmd_gnet(char *argbuf) {
 331         char filename[SIZ];
 332         char buf[SIZ];
 333         FILE *fp;
 334
 335         if (CtdlAccessCheck(ac_room_aide)) return;
 336         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 337         cprintf("%d Network settings for room #%ld <%s>\n",
 338                 LISTING_FOLLOWS,
 339                 CC->room.QRnumber, CC->room.QRname);
 340
 341         fp = fopen(filename, "r");
 342         if (fp != NULL) {
 343                 while (fgets(buf, sizeof buf, fp) != NULL) {
 344                         buf[strlen(buf)-1] = 0;
 345                         cprintf("%s\n", buf);
 346                 }
 347                 fclose(fp);
 348         }
 349
 350         cprintf("000\n");
 351 }
 352
 353
 354 void cmd_snet(char *argbuf) {
 355         char tempfilename[SIZ];
 356         char filename[SIZ];
 357         char buf[SIZ];
 358         FILE *fp;
 359
 360         if (CtdlAccessCheck(ac_room_aide)) return;
 361         safestrncpy(tempfilename, tmpnam(NULL), sizeof tempfilename);
 362         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 363
 364         fp = fopen(tempfilename, "w");
 365         if (fp == NULL) {
 366                 cprintf("%d Cannot open %s: %s\n",
 367                         ERROR + INTERNAL_ERROR,
 368                         tempfilename,
 369                         strerror(errno));
 370         }
 371
 372         cprintf("%d %s\n", SEND_LISTING, tempfilename);
 373         while (client_gets(buf), strcmp(buf, "000")) {
 374                 fprintf(fp, "%s\n", buf);
 375         }
 376         fclose(fp);
 377
 378         /* Now copy the temp file to its permanent location
 379          * (We use /bin/mv instead of link() because they may be on
 380          * different filesystems)
 381          */
 382         unlink(filename);
 383         snprintf(buf, sizeof buf, "/bin/mv %s %s", tempfilename, filename);
 384         begin_critical_section(S_NETCONFIGS);
 385         system(buf);
 386         end_critical_section(S_NETCONFIGS);
 387 }
 388
 389
 390 /*
 391  * Spools out one message from the list.
 392  */
 393 void network_spool_msg(long msgnum, void *userdata) {
 394         struct SpoolControl *sc;
 395         int err;
 396         int i;
 397         char *newpath = NULL;
 398         char *instr = NULL;
 399         size_t instr_len = SIZ;
 400         struct CtdlMessage *msg = NULL;
 401         struct CtdlMessage *imsg;
 402         struct namelist *nptr;
 403         struct ser_ret sermsg;
 404         FILE *fp;
 405         char filename[SIZ];
 406         char buf[SIZ];
 407         int bang = 0;
 408         int send = 1;
 409         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 410
 411         sc = (struct SpoolControl *)userdata;
 412
 413         /*
 414          * Process mailing list recipients
 415          */
 416         if (sc->listrecps != NULL) {
 417
 418                 /* First, copy it to the spoolout room */
 419                 err = CtdlSaveMsgPointerInRoom(SMTP_SPOOLOUT_ROOM, msgnum, 0);
 420                 if (err != 0) return;
 421
 422                 /*
 423                  * Figure out how big a buffer we need to allocate
 424                  */
 425                 for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 426                         instr_len = instr_len + strlen(nptr->name);
 427                 }
 428
 429                 /*
 430                  * allocate...
 431                  */
 432                 lprintf(CTDL_DEBUG, "Generating delivery instructions\n");
 433                 instr = malloc(instr_len);
 434                 if (instr == NULL) {
 435                         lprintf(CTDL_EMERG, "Cannot allocate %ld bytes for instr...\n",
 436                                 (long)instr_len);
 437                         abort();
 438                 }
 439                 snprintf(instr, instr_len,
 440                         "Content-type: %s\n\nmsgid|%ld\nsubmitted|%ld\n"
 441                         "bounceto|postmaster@%s\n" ,
 442                         SPOOLMIME, msgnum, (long)time(NULL), config.c_fqdn );
 443
 444                 /* Generate delivery instructions for each recipient */
 445                 for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 446                         size_t tmp = strlen(instr);
 447                         snprintf(&instr[tmp], instr_len - tmp,
 448                                  "remote|%s|0||\n", nptr->name);
 449                 }
 450
 451                 /*
 452                  * Generate a message from the instructions
 453                  */
 454                 imsg = malloc(sizeof(struct CtdlMessage));
 455                 memset(imsg, 0, sizeof(struct CtdlMessage));
 456                 imsg->cm_magic = CTDLMESSAGE_MAGIC;
 457                 imsg->cm_anon_type = MES_NORMAL;
 458                 imsg->cm_format_type = FMT_RFC822;
 459                 imsg->cm_fields['A'] = strdup("Citadel");
 460                 imsg->cm_fields['M'] = instr;
 461
 462                 /* Save delivery instructions in spoolout room */
 463                 CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM);
 464                 CtdlFreeMessage(imsg);
 465         }
 466
 467         /*
 468          * Process digest recipients
 469          */
 470         if ((sc->digestrecps != NULL) && (sc->digestfp != NULL)) {
 471                 fprintf(sc->digestfp,   " -----------------------------------"
 472                                         "------------------------------------"
 473                                         "-------\n");
 474                 CtdlRedirectOutput(sc->digestfp, -1);
 475                 CtdlOutputMsg(msgnum, MT_RFC822, HEADERS_ALL, 0, 0);
 476                 CtdlRedirectOutput(NULL, -1);
 477                 sc->num_msgs_spooled += 1;
 478         }
 479
 480         /*
 481          * Process IGnet push shares
 482          */
 483         if (sc->ignet_push_shares != NULL) {
 484
 485                 msg = CtdlFetchMessage(msgnum, 1);
 486                 if (msg != NULL) {
 487                         size_t newpath_len;
 488
 489                         /* Prepend our node name to the Path field whenever
 490                          * sending a message to another IGnet node
 491                          */
 492                         if (msg->cm_fields['P'] == NULL) {
 493                                 msg->cm_fields['P'] = strdup("username");
 494                         }
 495                         newpath_len = strlen(msg->cm_fields['P']) +
 496                                  strlen(config.c_nodename) + 2;
 497                         newpath = malloc(newpath_len);
 498                         snprintf(newpath, newpath_len, "%s!%s",
 499                                  config.c_nodename, msg->cm_fields['P']);
 500                         free(msg->cm_fields['P']);
 501                         msg->cm_fields['P'] = newpath;
 502
 503                         /*
 504                          * Force the message to appear in the correct room
 505                          * on the far end by setting the C field correctly
 506                          */
 507                         if (msg->cm_fields['C'] != NULL) {
 508                                 free(msg->cm_fields['C']);
 509                         }
 510                         msg->cm_fields['C'] = strdup(CC->room.QRname);
 511
 512                         /*
 513                          * Determine if this message is set to be deleted
 514                          * after sending out on the network
 515                          */
 516                         if (msg->cm_fields['S'] != NULL) {
 517                                 if (!strcasecmp(msg->cm_fields['S'],
 518                                    "CANCEL")) {
 519                                         delete_after_send = 1;
 520                                 }
 521                         }
 522
 523                         /*
 524                          * Now serialize it for transmission
 525                          */
 526                         serialize_message(&sermsg, msg);
 527
 528                         /* Now send it to every node */
 529                         for (nptr = sc->ignet_push_shares; nptr != NULL;
 530                             nptr = nptr->next) {
 531
 532                                 send = 1;
 533
 534                                 /* Check for valid node name */
 535                                 if (is_valid_node(NULL, NULL, nptr->name) != 0) {
 536                                         lprintf(CTDL_ERR, "Invalid node <%s>\n",
 537                                                 nptr->name);
 538                                         send = 0;
 539                                 }
 540
 541                                 /* Check for split horizon */
 542                                 lprintf(CTDL_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 543                                 bang = num_tokens(msg->cm_fields['P'], '!');
 544                                 if (bang > 1) for (i=0; i<(bang-1); ++i) {
 545                                         extract_token(buf, msg->cm_fields['P'],
 546                                                 i, '!');
 547                                         if (!strcasecmp(buf, nptr->name)) {
 548                                                 send = 0;
 549                                         }
 550                                 }
 551
 552                                 /* Send the message */
 553                                 if (send == 1) {
 554                                         snprintf(filename, sizeof filename,
 555                                                 "./network/spoolout/%s",
 556                                                 nptr->name);
 557                                         fp = fopen(filename, "ab");
 558                                         if (fp != NULL) {
 559                                                 fwrite(sermsg.ser,
 560                                                         sermsg.len, 1, fp);
 561                                                 fclose(fp);
 562                                         }
 563                                 }
 564                         }
 565                         free(sermsg.ser);
 566                         CtdlFreeMessage(msg);
 567                 }
 568         }
 569
 570         /* update lastsent */
 571         sc->lastsent = msgnum;
 572
 573         /* Delete this message if delete-after-send is set */
 574         if (delete_after_send) {
 575                 CtdlDeleteMessages(CC->room.QRname, msgnum, "");
 576         }
 577
 578 }
 579
 580
 581 /*
 582  * Deliver digest messages
 583  */
 584 void network_deliver_digest(struct SpoolControl *sc) {
 585         char buf[SIZ];
 586         int i;
 587         struct CtdlMessage *msg;
 588         long msglen;
 589         long msgnum;
 590         char *instr = NULL;
 591         size_t instr_len = SIZ;
 592         struct CtdlMessage *imsg;
 593         struct namelist *nptr;
 594
 595         if (sc->num_msgs_spooled < 1) {
 596                 fclose(sc->digestfp);
 597                 sc->digestfp = NULL;
 598                 return;
 599         }
 600
 601         msg = malloc(sizeof(struct CtdlMessage));
 602         memset(msg, 0, sizeof(struct CtdlMessage));
 603         msg->cm_magic = CTDLMESSAGE_MAGIC;
 604         msg->cm_format_type = FMT_RFC822;
 605         msg->cm_anon_type = MES_NORMAL;
 606
 607         sprintf(buf, "%ld", time(NULL));
 608         msg->cm_fields['T'] = strdup(buf);
 609         msg->cm_fields['A'] = strdup(CC->room.QRname);
 610         msg->cm_fields['U'] = strdup(CC->room.QRname);
 611         sprintf(buf, "room_%s@%s", CC->room.QRname, config.c_fqdn);
 612         for (i=0; i<strlen(buf); ++i) {
 613                 if (isspace(buf[i])) buf[i]='_';
 614                 buf[i] = tolower(buf[i]);
 615         }
 616         msg->cm_fields['F'] = strdup(buf);
 617
 618         fseek(sc->digestfp, 0L, SEEK_END);
 619         msglen = ftell(sc->digestfp);
 620
 621         msg->cm_fields['M'] = malloc(msglen + 1);
 622         fseek(sc->digestfp, 0L, SEEK_SET);
 623         fread(msg->cm_fields['M'], (size_t)msglen, 1, sc->digestfp);
 624         msg->cm_fields['M'][msglen] = 0;
 625
 626         fclose(sc->digestfp);
 627         sc->digestfp = NULL;
 628
 629         msgnum = CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM);
 630         CtdlFreeMessage(msg);
 631
 632         /* Now generate the delivery instructions */
 633
 634         /*
 635          * Figure out how big a buffer we need to allocate
 636          */
 637         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 638                 instr_len = instr_len + strlen(nptr->name);
 639         }
 640
 641         /*
 642          * allocate...
 643          */
 644         lprintf(CTDL_DEBUG, "Generating delivery instructions\n");
 645         instr = malloc(instr_len);
 646         if (instr == NULL) {
 647                 lprintf(CTDL_EMERG, "Cannot allocate %ld bytes for instr...\n",
 648                         (long)instr_len);
 649                 abort();
 650         }
 651         snprintf(instr, instr_len,
 652                 "Content-type: %s\n\nmsgid|%ld\nsubmitted|%ld\n"
 653                 "bounceto|postmaster@%s\n" ,
 654                 SPOOLMIME, msgnum, (long)time(NULL), config.c_fqdn );
 655
 656         /* Generate delivery instructions for each recipient */
 657         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 658                 size_t tmp = strlen(instr);
 659                 snprintf(&instr[tmp], instr_len - tmp,
 660                          "remote|%s|0||\n", nptr->name);
 661         }
 662
 663         /*
 664          * Generate a message from the instructions
 665          */
 666         imsg = malloc(sizeof(struct CtdlMessage));
 667         memset(imsg, 0, sizeof(struct CtdlMessage));
 668         imsg->cm_magic = CTDLMESSAGE_MAGIC;
 669         imsg->cm_anon_type = MES_NORMAL;
 670         imsg->cm_format_type = FMT_RFC822;
 671         imsg->cm_fields['A'] = strdup("Citadel");
 672         imsg->cm_fields['M'] = instr;
 673
 674         /* Save delivery instructions in spoolout room */
 675         CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM);
 676         CtdlFreeMessage(imsg);
 677 }
 678
 679
 680 /*
 681  * Batch up and send all outbound traffic from the current room
 682  */
 683 void network_spoolout_room(char *room_to_spool) {
 684         char filename[SIZ];
 685         char buf[SIZ];
 686         char instr[SIZ];
 687         char nodename[SIZ];
 688         char nexthop[SIZ];
 689         FILE *fp;
 690         struct SpoolControl sc;
 691         struct namelist *nptr = NULL;
 692         size_t miscsize = 0;
 693         size_t linesize = 0;
 694         int skipthisline = 0;
 695         int i;
 696
 697         if (getroom(&CC->room, room_to_spool) != 0) {
 698                 lprintf(CTDL_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
 699                 return;
 700         }
 701
 702         memset(&sc, 0, sizeof(struct SpoolControl));
 703         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 704
 705         begin_critical_section(S_NETCONFIGS);
 706
 707         fp = fopen(filename, "r");
 708         if (fp == NULL) {
 709                 end_critical_section(S_NETCONFIGS);
 710                 return;
 711         }
 712
 713         lprintf(CTDL_INFO, "Networking started for <%s>\n", CC->room.QRname);
 714
 715         while (fgets(buf, sizeof buf, fp) != NULL) {
 716                 buf[strlen(buf)-1] = 0;
 717
 718                 extract(instr, buf, 0);
 719                 if (!strcasecmp(instr, "lastsent")) {
 720                         sc.lastsent = extract_long(buf, 1);
 721                 }
 722                 else if (!strcasecmp(instr, "listrecp")) {
 723                         nptr = (struct namelist *)
 724                                 malloc(sizeof(struct namelist));
 725                         nptr->next = sc.listrecps;
 726                         extract(nptr->name, buf, 1);
 727                         sc.listrecps = nptr;
 728                 }
 729                 else if (!strcasecmp(instr, "digestrecp")) {
 730                         nptr = (struct namelist *)
 731                                 malloc(sizeof(struct namelist));
 732                         nptr->next = sc.digestrecps;
 733                         extract(nptr->name, buf, 1);
 734                         sc.digestrecps = nptr;
 735                 }
 736                 else if (!strcasecmp(instr, "ignet_push_share")) {
 737                         /* by checking each node's validity, we automatically
 738                          * purge nodes which do not exist from room network
 739                          * configurations at this time.
 740                          */
 741                         extract(nodename, buf, 1);
 742                         strcpy(nexthop, "xxx");
 743                         if (is_valid_node(nexthop, NULL, nodename) == 0) {
 744                                 if (strlen(nexthop) == 0) {
 745                                         nptr = (struct namelist *)
 746                                                 malloc(sizeof(struct namelist));
 747                                         nptr->next = sc.ignet_push_shares;
 748                                         strcpy(nptr->name, nodename);
 749                                         sc.ignet_push_shares = nptr;
 750                                 }
 751                         }
 752                 }
 753                 else {
 754                         /* Preserve 'other' lines ... *unless* they happen to
 755                          * be subscribe/unsubscribe pendings with expired
 756                          * timestamps.
 757                          */
 758                         skipthisline = 0;
 759                         if (!strncasecmp(buf, "subpending|", 11)) {
 760                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
 761                                         skipthisline = 1;
 762                                 }
 763                         }
 764                         if (!strncasecmp(buf, "unsubpending|", 13)) {
 765                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
 766                                         skipthisline = 1;
 767                                 }
 768                         }
 769
 770                         if (skipthisline == 0) {
 771                                 linesize = strlen(buf);
 772                                 sc.misc = realloc(sc.misc,
 773                                         (miscsize + linesize + 2) );
 774                                 sprintf(&sc.misc[miscsize], "%s\n", buf);
 775                                 miscsize = miscsize + linesize + 1;
 776                         }
 777                 }
 778
 779
 780         }
 781         fclose(fp);
 782
 783         /* If there are digest recipients, we have to build a digest */
 784         if (sc.digestrecps != NULL) {
 785                 sc.digestfp = tmpfile();
 786                 fprintf(sc.digestfp, "Content-type: text/plain\n\n");
 787         }
 788
 789         /* Do something useful */
 790         CtdlForEachMessage(MSGS_GT, sc.lastsent, NULL, NULL,
 791                 network_spool_msg, &sc);
 792
 793         /* If we wrote a digest, deliver it and then close it */
 794         snprintf(buf, sizeof buf, "room_%s@%s",
 795                 CC->room.QRname, config.c_fqdn);
 796         for (i=0; i<strlen(buf); ++i) {
 797                 buf[i] = tolower(buf[i]);
 798                 if (isspace(buf[i])) buf[i] = '_';
 799         }
 800         if (sc.digestfp != NULL) {
 801                 fprintf(sc.digestfp,    " -----------------------------------"
 802                                         "------------------------------------"
 803                                         "-------\n"
 804                                         "You are subscribed to the '%s' "
 805                                         "list.\n"
 806                                         "To post to the list: %s\n",
 807                                         CC->room.QRname, buf
 808                 );
 809                 network_deliver_digest(&sc);    /* deliver and close */
 810         }
 811
 812         /* Now rewrite the config file */
 813         fp = fopen(filename, "w");
 814         if (fp == NULL) {
 815                 lprintf(CTDL_CRIT, "ERROR: cannot open %s: %s\n",
 816                         filename, strerror(errno));
 817         }
 818         else {
 819                 fprintf(fp, "lastsent|%ld\n", sc.lastsent);
 820
 821                 /* Write out the listrecps while freeing from memory at the
 822                  * same time.  Am I clever or what?  :)
 823                  */
 824                 while (sc.listrecps != NULL) {
 825                         fprintf(fp, "listrecp|%s\n", sc.listrecps->name);
 826                         nptr = sc.listrecps->next;
 827                         free(sc.listrecps);
 828                         sc.listrecps = nptr;
 829                 }
 830                 /* Do the same for digestrecps */
 831                 while (sc.digestrecps != NULL) {
 832                         fprintf(fp, "digestrecp|%s\n", sc.digestrecps->name);
 833                         nptr = sc.digestrecps->next;
 834                         free(sc.digestrecps);
 835                         sc.digestrecps = nptr;
 836                 }
 837                 while (sc.ignet_push_shares != NULL) {
 838                         /* by checking each node's validity, we automatically
 839                          * purge nodes which do not exist from room network
 840                          * configurations at this time.
 841                          */
 842                         if (is_valid_node(NULL, NULL, sc.ignet_push_shares->name) == 0) {
 843                         }
 844                         fprintf(fp, "ignet_push_share|%s\n",
 845                                 sc.ignet_push_shares->name);
 846                         nptr = sc.ignet_push_shares->next;
 847                         free(sc.ignet_push_shares);
 848                         sc.ignet_push_shares = nptr;
 849                 }
 850                 if (sc.misc != NULL) {
 851                         fwrite(sc.misc, strlen(sc.misc), 1, fp);
 852                 }
 853                 free(sc.misc);
 854
 855                 fclose(fp);
 856         }
 857         end_critical_section(S_NETCONFIGS);
 858 }
 859
 860
 861
 862 /*
 863  * Send the *entire* contents of the current room to one specific network node,
 864  * ignoring anything we know about which messages have already undergone
 865  * network processing.  This can be used to bring a new node into sync.
 866  */
 867 int network_sync_to(char *target_node) {
 868         struct SpoolControl sc;
 869         int num_spooled = 0;
 870
 871         /* Concise syntax because we don't need a full linked-list */
 872         memset(&sc, 0, sizeof(struct SpoolControl));
 873         sc.ignet_push_shares = (struct namelist *)
 874                 malloc(sizeof(struct namelist));
 875         sc.ignet_push_shares->next = NULL;
 876         safestrncpy(sc.ignet_push_shares->name,
 877                 target_node,
 878                 sizeof sc.ignet_push_shares->name);
 879
 880         /* Send ALL messages */
 881         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL,
 882                 network_spool_msg, &sc);
 883
 884         /* Concise cleanup because we know there's only one node in the sc */
 885         free(sc.ignet_push_shares);
 886
 887         lprintf(CTDL_INFO, "Synchronized %d messages to <%s>\n",
 888                 num_spooled, target_node);
 889         return(num_spooled);
 890 }
 891
 892
 893 /*
 894  * Implements the NSYN command
 895  */
 896 void cmd_nsyn(char *argbuf) {
 897         int num_spooled;
 898         char target_node[SIZ];
 899
 900         if (CtdlAccessCheck(ac_aide)) return;
 901
 902         extract(target_node, argbuf, 0);
 903         num_spooled = network_sync_to(target_node);
 904         cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
 905 }
 906
 907
 908
 909 /*
 910  * Batch up and send all outbound traffic from the current room
 911  */
 912 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
 913         struct RoomProcList *ptr;
 914
 915         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
 916         if (ptr == NULL) return;
 917
 918         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
 919         ptr->next = rplist;
 920         rplist = ptr;
 921 }
 922
 923
 924 /*
 925  * Learn topology from path fields
 926  */
 927 void network_learn_topology(char *node, char *path) {
 928         char nexthop[SIZ];
 929         struct NetMap *nmptr;
 930
 931         strcpy(nexthop, "");
 932
 933         if (num_tokens(path, '!') < 3) return;
 934         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 935                 if (!strcasecmp(nmptr->nodename, node)) {
 936                         extract_token(nmptr->nexthop, path, 0, '!');
 937                         nmptr->lastcontact = time(NULL);
 938                         return;
 939                 }
 940         }
 941
 942         /* If we got here then it's not in the map, so add it. */
 943         nmptr = (struct NetMap *) malloc(sizeof (struct NetMap));
 944         strcpy(nmptr->nodename, node);
 945         nmptr->lastcontact = time(NULL);
 946         extract_token(nmptr->nexthop, path, 0, '!');
 947         nmptr->next = the_netmap;
 948         the_netmap = nmptr;
 949 }
 950
 951
 952
 953
 954 /*
 955  * Bounce a message back to the sender
 956  */
 957 void network_bounce(struct CtdlMessage *msg, char *reason) {
 958         char *oldpath = NULL;
 959         char buf[SIZ];
 960         char bouncesource[SIZ];
 961         char recipient[SIZ];
 962         struct recptypes *valid = NULL;
 963         char force_room[ROOMNAMELEN];
 964         static int serialnum = 0;
 965         size_t size;
 966
 967         lprintf(CTDL_DEBUG, "entering network_bounce()\n");
 968
 969         if (msg == NULL) return;
 970
 971         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
 972
 973         /*
 974          * Give it a fresh message ID
 975          */
 976         if (msg->cm_fields['I'] != NULL) {
 977                 free(msg->cm_fields['I']);
 978         }
 979         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
 980                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
 981         msg->cm_fields['I'] = strdup(buf);
 982
 983         /*
 984          * FIXME ... right now we're just sending a bounce; we really want to
 985          * include the text of the bounced message.
 986          */
 987         if (msg->cm_fields['M'] != NULL) {
 988                 free(msg->cm_fields['M']);
 989         }
 990         msg->cm_fields['M'] = strdup(reason);
 991         msg->cm_format_type = 0;
 992
 993         /*
 994          * Turn the message around
 995          */
 996         if (msg->cm_fields['R'] == NULL) {
 997                 free(msg->cm_fields['R']);
 998         }
 999
1000         if (msg->cm_fields['D'] == NULL) {
1001                 free(msg->cm_fields['D']);
1002         }
1003
1004         snprintf(recipient, sizeof recipient, "%s@%s",
1005                 msg->cm_fields['A'], msg->cm_fields['N']);
1006
1007         if (msg->cm_fields['A'] == NULL) {
1008                 free(msg->cm_fields['A']);
1009         }
1010
1011         if (msg->cm_fields['N'] == NULL) {
1012                 free(msg->cm_fields['N']);
1013         }
1014
1015         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1016         msg->cm_fields['N'] = strdup(config.c_nodename);
1017
1018
1019         /* prepend our node to the path */
1020         if (msg->cm_fields['P'] != NULL) {
1021                 oldpath = msg->cm_fields['P'];
1022                 msg->cm_fields['P'] = NULL;
1023         }
1024         else {
1025                 oldpath = strdup("unknown_user");
1026         }
1027         size = strlen(oldpath) + SIZ;
1028         msg->cm_fields['P'] = malloc(size);
1029         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1030         free(oldpath);
1031
1032         /* Now submit the message */
1033         valid = validate_recipients(recipient);
1034         if (valid != NULL) if (valid->num_error > 0) {
1035                 free(valid);
1036                 valid = NULL;
1037         }
1038         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1039                 strcpy(force_room, config.c_aideroom);
1040         }
1041         else {
1042                 strcpy(force_room, "");
1043         }
1044         if ( (valid == NULL) && (strlen(force_room) == 0) ) {
1045                 strcpy(force_room, config.c_aideroom);
1046         }
1047         CtdlSubmitMsg(msg, valid, force_room);
1048
1049         /* Clean up */
1050         if (valid != NULL) free(valid);
1051         CtdlFreeMessage(msg);
1052         lprintf(CTDL_DEBUG, "leaving network_bounce()\n");
1053 }
1054
1055
1056
1057
1058 /*
1059  * Process a buffer containing a single message from a single file
1060  * from the inbound queue
1061  */
1062 void network_process_buffer(char *buffer, long size) {
1063         struct CtdlMessage *msg;
1064         long pos;
1065         int field;
1066         struct recptypes *recp = NULL;
1067         char target_room[ROOMNAMELEN];
1068         struct ser_ret sermsg;
1069         char *oldpath = NULL;
1070         char filename[SIZ];
1071         FILE *fp;
1072         char nexthop[SIZ];
1073         unsigned char firstbyte;
1074         unsigned char lastbyte;
1075
1076         /* Validate just a little bit.  First byte should be FF and
1077          * last byte should be 00.
1078          */
1079         memcpy(&firstbyte, &buffer[0], 1);
1080         memcpy(&lastbyte, &buffer[size-1], 1);
1081         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1082                 lprintf(CTDL_ERR, "Corrupt message!  Ignoring.\n");
1083                 return;
1084         }
1085
1086         /* Set default target room to trash */
1087         strcpy(target_room, TWITROOM);
1088
1089         /* Load the message into memory */
1090         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1091         memset(msg, 0, sizeof(struct CtdlMessage));
1092         msg->cm_magic = CTDLMESSAGE_MAGIC;
1093         msg->cm_anon_type = buffer[1];
1094         msg->cm_format_type = buffer[2];
1095
1096         for (pos = 3; pos < size; ++pos) {
1097                 field = buffer[pos];
1098                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1099                 pos = pos + strlen(&buffer[(int)pos]);
1100         }
1101
1102         /* Check for message routing */
1103         if (msg->cm_fields['D'] != NULL) {
1104                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1105
1106                         /* route the message */
1107                         strcpy(nexthop, "");
1108                         if (is_valid_node(nexthop, NULL,
1109                            msg->cm_fields['D']) == 0) {
1110
1111                                 /* prepend our node to the path */
1112                                 if (msg->cm_fields['P'] != NULL) {
1113                                         oldpath = msg->cm_fields['P'];
1114                                         msg->cm_fields['P'] = NULL;
1115                                 }
1116                                 else {
1117                                         oldpath = strdup("unknown_user");
1118                                 }
1119                                 size = strlen(oldpath) + SIZ;
1120                                 msg->cm_fields['P'] = malloc(size);
1121                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1122                                         config.c_nodename, oldpath);
1123                                 free(oldpath);
1124
1125                                 /* serialize the message */
1126                                 serialize_message(&sermsg, msg);
1127
1128                                 /* now send it */
1129                                 if (strlen(nexthop) == 0) {
1130                                         strcpy(nexthop, msg->cm_fields['D']);
1131                                 }
1132                                 snprintf(filename, sizeof filename,
1133                                         "./network/spoolout/%s", nexthop);
1134                                 fp = fopen(filename, "ab");
1135                                 if (fp != NULL) {
1136                                         fwrite(sermsg.ser,
1137                                                 sermsg.len, 1, fp);
1138                                         fclose(fp);
1139                                 }
1140                                 free(sermsg.ser);
1141                                 CtdlFreeMessage(msg);
1142                                 return;
1143                         }
1144
1145                         else {  /* invalid destination node name */
1146
1147                                 network_bounce(msg,
1148 "A message you sent could not be delivered due to an invalid destination node"
1149 " name.  Please check the address and try sending the message again.\n");
1150                                 msg = NULL;
1151                                 return;
1152
1153                         }
1154                 }
1155         }
1156
1157         /*
1158          * Check to see if we already have a copy of this message, and
1159          * abort its processing if so.  (We used to post a warning to Aide>
1160          * every time this happened, but the network is now so densely
1161          * connected that it's inevitable.)
1162          */
1163         if (network_usetable(msg) != 0) {
1164                 return;
1165         }
1166
1167         /* Learn network topology from the path */
1168         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1169                 network_learn_topology(msg->cm_fields['N'],
1170                                         msg->cm_fields['P']);
1171         }
1172
1173         /* Is the sending node giving us a very persuasive suggestion about
1174          * which room this message should be saved in?  If so, go with that.
1175          */
1176         if (msg->cm_fields['C'] != NULL) {
1177                 safestrncpy(target_room,
1178                         msg->cm_fields['C'],
1179                         sizeof target_room);
1180         }
1181
1182         /* Otherwise, does it have a recipient?  If so, validate it... */
1183         else if (msg->cm_fields['R'] != NULL) {
1184                 recp = validate_recipients(msg->cm_fields['R']);
1185                 if (recp != NULL) if (recp->num_error > 0) {
1186                         network_bounce(msg,
1187 "A message you sent could not be delivered due to an invalid address.\n"
1188 "Please check the address and try sending the message again.\n");
1189                         msg = NULL;
1190                         free(recp);
1191                         return;
1192                 }
1193                 strcpy(target_room, "");        /* no target room if mail */
1194         }
1195
1196         /* Our last shot at finding a home for this message is to see if
1197          * it has the O field (Originating room) set.
1198          */
1199         else if (msg->cm_fields['O'] != NULL) {
1200                 safestrncpy(target_room,
1201                         msg->cm_fields['O'],
1202                         sizeof target_room);
1203         }
1204
1205         /* Strip out fields that are only relevant during transit */
1206         if (msg->cm_fields['D'] != NULL) {
1207                 free(msg->cm_fields['D']);
1208                 msg->cm_fields['D'] = NULL;
1209         }
1210         if (msg->cm_fields['C'] != NULL) {
1211                 free(msg->cm_fields['C']);
1212                 msg->cm_fields['C'] = NULL;
1213         }
1214
1215         /* save the message into a room */
1216         if (PerformNetprocHooks(msg, target_room) == 0) {
1217                 msg->cm_flags = CM_SKIP_HOOKS;
1218                 CtdlSubmitMsg(msg, recp, target_room);
1219         }
1220         CtdlFreeMessage(msg);
1221         free(recp);
1222 }
1223
1224
1225 /*
1226  * Process a single message from a single file from the inbound queue
1227  */
1228 void network_process_message(FILE *fp, long msgstart, long msgend) {
1229         long hold_pos;
1230         long size;
1231         char *buffer;
1232
1233         hold_pos = ftell(fp);
1234         size = msgend - msgstart + 1;
1235         buffer = malloc(size);
1236         if (buffer != NULL) {
1237                 fseek(fp, msgstart, SEEK_SET);
1238                 fread(buffer, size, 1, fp);
1239                 network_process_buffer(buffer, size);
1240                 free(buffer);
1241         }
1242
1243         fseek(fp, hold_pos, SEEK_SET);
1244 }
1245
1246
1247 /*
1248  * Process a single file from the inbound queue
1249  */
1250 void network_process_file(char *filename) {
1251         FILE *fp;
1252         long msgstart = (-1L);
1253         long msgend = (-1L);
1254         long msgcur = 0L;
1255         int ch;
1256
1257
1258         fp = fopen(filename, "rb");
1259         if (fp == NULL) {
1260                 lprintf(CTDL_CRIT, "Error opening %s: %s\n",
1261                         filename, strerror(errno));
1262                 return;
1263         }
1264
1265         lprintf(CTDL_INFO, "network: processing <%s>\n", filename);
1266
1267         /* Look for messages in the data stream and break them out */
1268         while (ch = getc(fp), ch >= 0) {
1269
1270                 if (ch == 255) {
1271                         if (msgstart >= 0L) {
1272                                 msgend = msgcur - 1;
1273                                 network_process_message(fp, msgstart, msgend);
1274                         }
1275                         msgstart = msgcur;
1276                 }
1277
1278                 ++msgcur;
1279         }
1280
1281         msgend = msgcur - 1;
1282         if (msgstart >= 0L) {
1283                 network_process_message(fp, msgstart, msgend);
1284         }
1285
1286         fclose(fp);
1287         unlink(filename);
1288 }
1289
1290
1291 /*
1292  * Process anything in the inbound queue
1293  */
1294 void network_do_spoolin(void) {
1295         DIR *dp;
1296         struct dirent *d;
1297         char filename[SIZ];
1298
1299         dp = opendir("./network/spoolin");
1300         if (dp == NULL) return;
1301
1302         while (d = readdir(dp), d != NULL) {
1303                 snprintf(filename, sizeof filename,
1304                         "./network/spoolin/%s", d->d_name);
1305                 network_process_file(filename);
1306         }
1307
1308
1309         closedir(dp);
1310 }
1311
1312
1313 /*
1314  * Delete any files in the outbound queue that were intended
1315  * to be sent to nodes which no longer exist.
1316  */
1317 void network_purge_spoolout(void) {
1318         DIR *dp;
1319         struct dirent *d;
1320         char filename[SIZ];
1321         char nexthop[SIZ];
1322         int i;
1323
1324         dp = opendir("./network/spoolout");
1325         if (dp == NULL) return;
1326
1327         while (d = readdir(dp), d != NULL) {
1328                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
1329                         continue;
1330                 snprintf(filename, sizeof filename,
1331                         "./network/spoolout/%s", d->d_name);
1332
1333                 strcpy(nexthop, "");
1334                 i = is_valid_node(nexthop, NULL, d->d_name);
1335
1336                 if ( (i != 0) || (strlen(nexthop) > 0) ) {
1337                         unlink(filename);
1338                 }
1339         }
1340
1341
1342         closedir(dp);
1343 }
1344
1345
1346
1347 /*
1348  * receive network spool from the remote system
1349  */
1350 void receive_spool(int sock, char *remote_nodename) {
1351         long download_len;
1352         long bytes_received;
1353         char buf[SIZ];
1354         static char pbuf[IGNET_PACKET_SIZE];
1355         char tempfilename[PATH_MAX];
1356         long plen;
1357         FILE *fp;
1358
1359         strcpy(tempfilename, tmpnam(NULL));
1360         if (sock_puts(sock, "NDOP") < 0) return;
1361         if (sock_gets(sock, buf) < 0) return;
1362         lprintf(CTDL_DEBUG, "<%s\n", buf);
1363         if (buf[0] != '2') {
1364                 return;
1365         }
1366         download_len = extract_long(&buf[4], 0);
1367
1368         bytes_received = 0L;
1369         fp = fopen(tempfilename, "w");
1370         if (fp == NULL) {
1371                 lprintf(CTDL_CRIT, "cannot open download file locally: %s\n",
1372                         strerror(errno));
1373                 return;
1374         }
1375
1376         while (bytes_received < download_len) {
1377                 snprintf(buf, sizeof buf, "READ %ld|%ld",
1378                         bytes_received,
1379                      ((download_len - bytes_received > IGNET_PACKET_SIZE)
1380                  ? IGNET_PACKET_SIZE : (download_len - bytes_received)));
1381                 if (sock_puts(sock, buf) < 0) {
1382                         fclose(fp);
1383                         unlink(tempfilename);
1384                         return;
1385                 }
1386                 if (sock_gets(sock, buf) < 0) {
1387                         fclose(fp);
1388                         unlink(tempfilename);
1389                         return;
1390                 }
1391                 if (buf[0] == '6') {
1392                         plen = extract_long(&buf[4], 0);
1393                         if (sock_read(sock, pbuf, plen) < 0) {
1394                                 fclose(fp);
1395                                 unlink(tempfilename);
1396                                 return;
1397                         }
1398                         fwrite((char *) pbuf, plen, 1, fp);
1399                         bytes_received = bytes_received + plen;
1400                 }
1401         }
1402
1403         fclose(fp);
1404         if (sock_puts(sock, "CLOS") < 0) {
1405                 unlink(tempfilename);
1406                 return;
1407         }
1408         if (sock_gets(sock, buf) < 0) {
1409                 unlink(tempfilename);
1410                 return;
1411         }
1412         lprintf(CTDL_DEBUG, "%s\n", buf);
1413         snprintf(buf, sizeof buf, "mv %s ./network/spoolin/%s.%ld",
1414                 tempfilename, remote_nodename, (long) getpid());
1415         system(buf);
1416 }
1417
1418
1419
1420 /*
1421  * transmit network spool to the remote system
1422  */
1423 void transmit_spool(int sock, char *remote_nodename)
1424 {
1425         char buf[SIZ];
1426         char pbuf[4096];
1427         long plen;
1428         long bytes_to_write, thisblock;
1429         int fd;
1430         char sfname[128];
1431
1432         if (sock_puts(sock, "NUOP") < 0) return;
1433         if (sock_gets(sock, buf) < 0) return;
1434         lprintf(CTDL_DEBUG, "<%s\n", buf);
1435         if (buf[0] != '2') {
1436                 return;
1437         }
1438
1439         snprintf(sfname, sizeof sfname, "./network/spoolout/%s", remote_nodename);
1440         fd = open(sfname, O_RDONLY);
1441         if (fd < 0) {
1442                 if (errno == ENOENT) {
1443                         lprintf(CTDL_INFO, "Nothing to send.\n");
1444                 } else {
1445                         lprintf(CTDL_CRIT, "cannot open upload file locally: %s\n",
1446                                 strerror(errno));
1447                 }
1448                 return;
1449         }
1450         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
1451                 bytes_to_write = plen;
1452                 while (bytes_to_write > 0L) {
1453                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
1454                         if (sock_puts(sock, buf) < 0) {
1455                                 close(fd);
1456                                 return;
1457                         }
1458                         if (sock_gets(sock, buf) < 0) {
1459                                 close(fd);
1460                                 return;
1461                         }
1462                         thisblock = atol(&buf[4]);
1463                         if (buf[0] == '7') {
1464                                 if (sock_write(sock, pbuf,
1465                                    (int) thisblock) < 0) {
1466                                         close(fd);
1467                                         return;
1468                                 }
1469                                 bytes_to_write = bytes_to_write - thisblock;
1470                         } else {
1471                                 goto ABORTUPL;
1472                         }
1473                 }
1474         }
1475
1476 ABORTUPL:
1477         close(fd);
1478         if (sock_puts(sock, "UCLS 1") < 0) return;
1479         if (sock_gets(sock, buf) < 0) return;
1480         lprintf(CTDL_DEBUG, "<%s\n", buf);
1481         if (buf[0] == '2') {
1482                 unlink(sfname);
1483         }
1484 }
1485
1486
1487
1488 /*
1489  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
1490  */
1491 void network_poll_node(char *node, char *secret, char *host, char *port) {
1492         int sock;
1493         char buf[SIZ];
1494
1495         if (network_talking_to(node, NTT_CHECK)) return;
1496         network_talking_to(node, NTT_ADD);
1497         lprintf(CTDL_INFO, "Polling node <%s> at %s:%s\n", node, host, port);
1498
1499         sock = sock_connect(host, port, "tcp");
1500         if (sock < 0) {
1501                 lprintf(CTDL_ERR, "Could not connect: %s\n", strerror(errno));
1502                 network_talking_to(node, NTT_REMOVE);
1503                 return;
1504         }
1505
1506         lprintf(CTDL_DEBUG, "Connected!\n");
1507
1508         /* Read the server greeting */
1509         if (sock_gets(sock, buf) < 0) goto bail;
1510         lprintf(CTDL_DEBUG, ">%s\n", buf);
1511
1512         /* Identify ourselves */
1513         snprintf(buf, sizeof buf, "NETP %s|%s", config.c_nodename, secret);
1514         lprintf(CTDL_DEBUG, "<%s\n", buf);
1515         if (sock_puts(sock, buf) <0) goto bail;
1516         if (sock_gets(sock, buf) < 0) goto bail;
1517         lprintf(CTDL_DEBUG, ">%s\n", buf);
1518         if (buf[0] != '2') goto bail;
1519
1520         /* At this point we are authenticated. */
1521         receive_spool(sock, node);
1522         transmit_spool(sock, node);
1523
1524         sock_puts(sock, "QUIT");
1525 bail:   sock_close(sock);
1526         network_talking_to(node, NTT_REMOVE);
1527 }
1528
1529
1530
1531 /*
1532  * Poll other Citadel nodes and transfer inbound/outbound network data.
1533  * Set "full" to nonzero to force a poll of every node, or to zero to poll
1534  * only nodes to which we have data to send.
1535  */
1536 void network_poll_other_citadel_nodes(int full_poll) {
1537         int i;
1538         char linebuf[SIZ];
1539         char node[SIZ];
1540         char host[SIZ];
1541         char port[SIZ];
1542         char secret[SIZ];
1543         int poll = 0;
1544         char spoolfile[SIZ];
1545
1546         if (working_ignetcfg == NULL) {
1547                 lprintf(CTDL_DEBUG, "No nodes defined - not polling\n");
1548                 return;
1549         }
1550
1551         /* Use the string tokenizer to grab one line at a time */
1552         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
1553                 extract_token(linebuf, working_ignetcfg, i, '\n');
1554                 extract(node, linebuf, 0);
1555                 extract(secret, linebuf, 1);
1556                 extract(host, linebuf, 2);
1557                 extract(port, linebuf, 3);
1558                 if ( (strlen(node) > 0) && (strlen(secret) > 0)
1559                    && (strlen(host) > 0) && strlen(port) > 0) {
1560                         poll = full_poll;
1561                         if (poll == 0) {
1562                                 sprintf(spoolfile, "./network/spoolout/%s",
1563                                         node);
1564                                 if (access(spoolfile, R_OK) == 0) {
1565                                         poll = 1;
1566                                 }
1567                         }
1568                         if (poll) {
1569                                 network_poll_node(node, secret, host, port);
1570                         }
1571                 }
1572         }
1573
1574 }
1575
1576
1577
1578
1579
1580
1581
1582 /*
1583  * network_do_queue()
1584  *
1585  * Run through the rooms doing various types of network stuff.
1586  */
1587 void network_do_queue(void) {
1588         static time_t last_run = 0L;
1589         struct RoomProcList *ptr;
1590         int full_processing = 1;
1591
1592         /*
1593          * Run the full set of processing tasks no more frequently
1594          * than once every n seconds
1595          */
1596         if ( (time(NULL) - last_run) < config.c_net_freq ) {
1597                 full_processing = 0;
1598         }
1599
1600         /*
1601          * This is a simple concurrency check to make sure only one queue run
1602          * is done at a time.  We could do this with a mutex, but since we
1603          * don't really require extremely fine granularity here, we'll do it
1604          * with a static variable instead.
1605          */
1606         if (doing_queue) return;
1607         doing_queue = 1;
1608
1609         /* Load the IGnet Configuration into memory */
1610         working_ignetcfg = CtdlGetSysConfig(IGNETCFG);
1611
1612         /*
1613          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
1614          * then we poll everyone.  Otherwise we only poll nodes we have stuff
1615          * to send to.
1616          */
1617         network_poll_other_citadel_nodes(full_processing);
1618
1619         /*
1620          * Load the network map and filter list into memory.
1621          */
1622         read_network_map();
1623         filterlist = load_filter_list();
1624
1625         /*
1626          * Go ahead and run the queue
1627          */
1628         if (full_processing) {
1629                 lprintf(CTDL_INFO, "network: loading outbound queue\n");
1630                 ForEachRoom(network_queue_room, NULL);
1631
1632                 lprintf(CTDL_INFO, "network: running outbound queue\n");
1633                 while (rplist != NULL) {
1634                         network_spoolout_room(rplist->name);
1635                         ptr = rplist;
1636                         rplist = rplist->next;
1637                         free(ptr);
1638                 }
1639         }
1640
1641         lprintf(CTDL_INFO, "network: processing inbound queue\n");
1642         network_do_spoolin();
1643
1644         /* Save the network map back to disk */
1645         write_network_map();
1646
1647         /* Free the filter list in memory */
1648         free_filter_list(filterlist);
1649         filterlist = NULL;
1650
1651         network_purge_spoolout();
1652
1653         lprintf(CTDL_INFO, "network: queue run completed\n");
1654
1655         if (full_processing) {
1656                 last_run = time(NULL);
1657         }
1658
1659         doing_queue = 0;
1660         free(working_ignetcfg);
1661         working_ignetcfg = NULL;
1662 }
1663
1664
1665 /*
1666  * cmd_netp() - authenticate to the server as another Citadel node polling
1667  *              for network traffic
1668  */
1669 void cmd_netp(char *cmdbuf)
1670 {
1671         char node[SIZ];
1672         char pass[SIZ];
1673         int v;
1674
1675         char secret[SIZ];
1676         char nexthop[SIZ];
1677
1678         if (doing_queue) {
1679                 lprintf(CTDL_DEBUG, "spooling - try again in a few minutes");
1680                 cprintf("%d spooling - try again in a few minutes\n",
1681                         ERROR + RESOURCE_BUSY);
1682                 return;
1683         }
1684
1685         /* Authenticate */
1686         extract(node, cmdbuf, 0);
1687         extract(pass, cmdbuf, 1);
1688
1689         /* Briefly load the IGnet Configuration to check node validity */
1690         working_ignetcfg = CtdlGetSysConfig(IGNETCFG);
1691         v = is_valid_node(nexthop, secret, node);
1692         free(working_ignetcfg);
1693         working_ignetcfg = NULL;
1694
1695         if (v != 0) {
1696                 lprintf(CTDL_DEBUG, "authentication failed (node)");
1697                 cprintf("%d authentication failed\n",
1698                         ERROR + PASSWORD_REQUIRED);
1699                 return;
1700         }
1701
1702         if (strcasecmp(pass, secret)) {
1703                 lprintf(CTDL_DEBUG, "authentication failed (password)");
1704                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
1705                 return;
1706         }
1707
1708         if (network_talking_to(node, NTT_CHECK)) {
1709                 lprintf(CTDL_DEBUG, "already talking to you");
1710                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
1711                 return;
1712         }
1713
1714         safestrncpy(CC->net_node, node, sizeof CC->net_node);
1715         network_talking_to(node, NTT_ADD);
1716         lprintf(CTDL_DEBUG, "authenticated ok");
1717         cprintf("%d authenticated as network node '%s'\n", CIT_OK,
1718                 CC->net_node);
1719 }
1720
1721
1722
1723 /*
1724  * Module entry point
1725  */
1726 char *serv_network_init(void)
1727 {
1728         CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
1729         CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
1730         CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
1731         CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
1732         CtdlRegisterSessionHook(network_do_queue, EVT_TIMER);
1733         return "$Id$";
1734 }