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
  88 char *ignetcfg = NULL;
  89
  90 /*
  91  * Keep track of what messages to reject
  92  */
  93 struct FilterList *load_filter_list(void) {
  94         char *serialized_list = NULL;
  95         int i;
  96         char buf[SIZ];
  97         struct FilterList *newlist = NULL;
  98         struct FilterList *nptr;
  99
 100         serialized_list = CtdlGetSysConfig(FILTERLIST);
 101         if (serialized_list == NULL) return(NULL); /* if null, no entries */
 102
 103         /* Use the string tokenizer to grab one line at a time */
 104         for (i=0; i<num_tokens(serialized_list, '\n'); ++i) {
 105                 extract_token(buf, serialized_list, i, '\n');
 106                 nptr = (struct FilterList *) malloc(sizeof(struct FilterList));
 107                 extract(nptr->fl_user, buf, 0);
 108                 striplt(nptr->fl_user);
 109                 extract(nptr->fl_room, buf, 1);
 110                 striplt(nptr->fl_room);
 111                 extract(nptr->fl_node, buf, 2);
 112                 striplt(nptr->fl_node);
 113
 114                 /* Cowardly refuse to add an any/any/any entry that would
 115                  * end up filtering every single message.
 116                  */
 117                 if (strlen(nptr->fl_user) + strlen(nptr->fl_room)
 118                    + strlen(nptr->fl_node) == 0) {
 119                         free(nptr);
 120                 }
 121                 else {
 122                         nptr->next = newlist;
 123                         newlist = nptr;
 124                 }
 125         }
 126
 127         free(serialized_list);
 128         return newlist;
 129 }
 130
 131
 132 void free_filter_list(struct FilterList *fl) {
 133         if (fl == NULL) return;
 134         free_filter_list(fl->next);
 135         free(fl);
 136 }
 137
 138
 139
 140 /*
 141  * Check the use table.  This is a list of messages which have recently
 142  * arrived on the system.  It is maintained and queried to prevent the same
 143  * message from being entered into the database multiple times if it happens
 144  * to arrive multiple times by accident.
 145  */
 146 int network_usetable(struct CtdlMessage *msg) {
 147
 148         char msgid[SIZ];
 149         struct cdbdata *cdbut;
 150         struct UseTable ut;
 151
 152         /* Bail out if we can't generate a message ID */
 153         if (msg == NULL) {
 154                 return(0);
 155         }
 156         if (msg->cm_fields['I'] == NULL) {
 157                 return(0);
 158         }
 159         if (strlen(msg->cm_fields['I']) == 0) {
 160                 return(0);
 161         }
 162
 163         /* Generate the message ID */
 164         strcpy(msgid, msg->cm_fields['I']);
 165         if (haschar(msgid, '@') == 0) {
 166                 strcat(msgid, "@");
 167                 if (msg->cm_fields['N'] != NULL) {
 168                         strcat(msgid, msg->cm_fields['N']);
 169                 }
 170                 else {
 171                         return(0);
 172                 }
 173         }
 174
 175         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 176         if (cdbut != NULL) {
 177                 cdb_free(cdbut);
 178                 return(1);
 179         }
 180
 181         /* If we got to this point, it's unique: add it. */
 182         strcpy(ut.ut_msgid, msgid);
 183         ut.ut_timestamp = time(NULL);
 184         cdb_store(CDB_USETABLE, msgid, strlen(msgid),
 185                 &ut, sizeof(struct UseTable) );
 186         return(0);
 187 }
 188
 189
 190 /*
 191  * Read the network map from its configuration file into memory.
 192  */
 193 void read_network_map(void) {
 194         char *serialized_map = NULL;
 195         int i;
 196         char buf[SIZ];
 197         struct NetMap *nmptr;
 198
 199         serialized_map = CtdlGetSysConfig(IGNETMAP);
 200         if (serialized_map == NULL) return;     /* if null, no entries */
 201
 202         /* Use the string tokenizer to grab one line at a time */
 203         for (i=0; i<num_tokens(serialized_map, '\n'); ++i) {
 204                 extract_token(buf, serialized_map, i, '\n');
 205                 nmptr = (struct NetMap *) malloc(sizeof(struct NetMap));
 206                 extract(nmptr->nodename, buf, 0);
 207                 nmptr->lastcontact = extract_long(buf, 1);
 208                 extract(nmptr->nexthop, buf, 2);
 209                 nmptr->next = the_netmap;
 210                 the_netmap = nmptr;
 211         }
 212
 213         free(serialized_map);
 214 }
 215
 216
 217 /*
 218  * Write the network map from memory back to the configuration file.
 219  */
 220 void write_network_map(void) {
 221         char *serialized_map = NULL;
 222         struct NetMap *nmptr;
 223
 224         serialized_map = strdup("");
 225
 226         if (the_netmap != NULL) {
 227                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 228                         serialized_map = realloc(serialized_map,
 229                                                 (strlen(serialized_map)+SIZ) );
 230                         if (strlen(nmptr->nodename) > 0) {
 231                                 snprintf(&serialized_map[strlen(serialized_map)],
 232                                         SIZ,
 233                                         "%s|%ld|%s\n",
 234                                         nmptr->nodename,
 235                                         (long)nmptr->lastcontact,
 236                                         nmptr->nexthop);
 237                         }
 238                 }
 239         }
 240
 241         CtdlPutSysConfig(IGNETMAP, serialized_map);
 242         free(serialized_map);
 243
 244         /* Now free the list */
 245         while (the_netmap != NULL) {
 246                 nmptr = the_netmap->next;
 247                 free(the_netmap);
 248                 the_netmap = nmptr;
 249         }
 250 }
 251
 252
 253
 254 /*
 255  * Check the network map and determine whether the supplied node name is
 256  * valid.  If it is not a neighbor node, supply the name of a neighbor node
 257  * which is the next hop.  If it *is* a neighbor node, we also fill in the
 258  * shared secret.
 259  */
 260 int is_valid_node(char *nexthop, char *secret, char *node) {
 261         int i;
 262         char linebuf[SIZ];
 263         char buf[SIZ];
 264         int retval;
 265         struct NetMap *nmptr;
 266
 267         if (node == NULL) {
 268                 return(-1);
 269         }
 270
 271         /*
 272          * First try the neighbor nodes
 273          */
 274         if (ignetcfg == 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(ignetcfg, '\n'); ++i) {
 288                 extract_token(linebuf, 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         FILE *fp;
 688         struct SpoolControl sc;
 689         struct namelist *nptr = NULL;
 690         size_t miscsize = 0;
 691         size_t linesize = 0;
 692         int skipthisline = 0;
 693         int i;
 694
 695         if (getroom(&CC->room, room_to_spool) != 0) {
 696                 lprintf(CTDL_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
 697                 return;
 698         }
 699
 700         memset(&sc, 0, sizeof(struct SpoolControl));
 701         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 702
 703         begin_critical_section(S_NETCONFIGS);
 704
 705         fp = fopen(filename, "r");
 706         if (fp == NULL) {
 707                 end_critical_section(S_NETCONFIGS);
 708                 return;
 709         }
 710
 711         lprintf(CTDL_INFO, "Networking started for <%s>\n", CC->room.QRname);
 712
 713         while (fgets(buf, sizeof buf, fp) != NULL) {
 714                 buf[strlen(buf)-1] = 0;
 715
 716                 extract(instr, buf, 0);
 717                 if (!strcasecmp(instr, "lastsent")) {
 718                         sc.lastsent = extract_long(buf, 1);
 719                 }
 720                 else if (!strcasecmp(instr, "listrecp")) {
 721                         nptr = (struct namelist *)
 722                                 malloc(sizeof(struct namelist));
 723                         nptr->next = sc.listrecps;
 724                         extract(nptr->name, buf, 1);
 725                         sc.listrecps = nptr;
 726                 }
 727                 else if (!strcasecmp(instr, "digestrecp")) {
 728                         nptr = (struct namelist *)
 729                                 malloc(sizeof(struct namelist));
 730                         nptr->next = sc.digestrecps;
 731                         extract(nptr->name, buf, 1);
 732                         sc.digestrecps = nptr;
 733                 }
 734                 else if (!strcasecmp(instr, "ignet_push_share")) {
 735                         /* by checking each node's validity, we automatically
 736                          * purge nodes which do not exist from room network
 737                          * configurations at this time.
 738                          */
 739                         if (is_valid_node(NULL, NULL, buf) == 0) {
 740                                 nptr = (struct namelist *)
 741                                         malloc(sizeof(struct namelist));
 742                                 nptr->next = sc.ignet_push_shares;
 743                                 extract(nptr->name, buf, 1);
 744                                 sc.ignet_push_shares = nptr;
 745                         }
 746                 }
 747                 else {
 748                         /* Preserve 'other' lines ... *unless* they happen to
 749                          * be subscribe/unsubscribe pendings with expired
 750                          * timestamps.
 751                          */
 752                         skipthisline = 0;
 753                         if (!strncasecmp(buf, "subpending|", 11)) {
 754                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
 755                                         skipthisline = 1;
 756                                 }
 757                         }
 758                         if (!strncasecmp(buf, "unsubpending|", 13)) {
 759                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
 760                                         skipthisline = 1;
 761                                 }
 762                         }
 763
 764                         if (skipthisline == 0) {
 765                                 linesize = strlen(buf);
 766                                 sc.misc = realloc(sc.misc,
 767                                         (miscsize + linesize + 2) );
 768                                 sprintf(&sc.misc[miscsize], "%s\n", buf);
 769                                 miscsize = miscsize + linesize + 1;
 770                         }
 771                 }
 772
 773
 774         }
 775         fclose(fp);
 776
 777         /* If there are digest recipients, we have to build a digest */
 778         if (sc.digestrecps != NULL) {
 779                 sc.digestfp = tmpfile();
 780                 fprintf(sc.digestfp, "Content-type: text/plain\n\n");
 781         }
 782
 783         /* Do something useful */
 784         CtdlForEachMessage(MSGS_GT, sc.lastsent, NULL, NULL,
 785                 network_spool_msg, &sc);
 786
 787         /* If we wrote a digest, deliver it and then close it */
 788         snprintf(buf, sizeof buf, "room_%s@%s",
 789                 CC->room.QRname, config.c_fqdn);
 790         for (i=0; i<strlen(buf); ++i) {
 791                 buf[i] = tolower(buf[i]);
 792                 if (isspace(buf[i])) buf[i] = '_';
 793         }
 794         if (sc.digestfp != NULL) {
 795                 fprintf(sc.digestfp,    " -----------------------------------"
 796                                         "------------------------------------"
 797                                         "-------\n"
 798                                         "You are subscribed to the '%s' "
 799                                         "list.\n"
 800                                         "To post to the list: %s\n",
 801                                         CC->room.QRname, buf
 802                 );
 803                 network_deliver_digest(&sc);    /* deliver and close */
 804         }
 805
 806         /* Now rewrite the config file */
 807         fp = fopen(filename, "w");
 808         if (fp == NULL) {
 809                 lprintf(CTDL_CRIT, "ERROR: cannot open %s: %s\n",
 810                         filename, strerror(errno));
 811         }
 812         else {
 813                 fprintf(fp, "lastsent|%ld\n", sc.lastsent);
 814
 815                 /* Write out the listrecps while freeing from memory at the
 816                  * same time.  Am I clever or what?  :)
 817                  */
 818                 while (sc.listrecps != NULL) {
 819                         fprintf(fp, "listrecp|%s\n", sc.listrecps->name);
 820                         nptr = sc.listrecps->next;
 821                         free(sc.listrecps);
 822                         sc.listrecps = nptr;
 823                 }
 824                 /* Do the same for digestrecps */
 825                 while (sc.digestrecps != NULL) {
 826                         fprintf(fp, "digestrecp|%s\n", sc.digestrecps->name);
 827                         nptr = sc.digestrecps->next;
 828                         free(sc.digestrecps);
 829                         sc.digestrecps = nptr;
 830                 }
 831                 while (sc.ignet_push_shares != NULL) {
 832                         /* by checking each node's validity, we automatically
 833                          * purge nodes which do not exist from room network
 834                          * configurations at this time.
 835                          */
 836                         if (is_valid_node(NULL, NULL, sc.ignet_push_shares->name) == 0) {
 837                         }
 838                         fprintf(fp, "ignet_push_share|%s\n",
 839                                 sc.ignet_push_shares->name);
 840                         nptr = sc.ignet_push_shares->next;
 841                         free(sc.ignet_push_shares);
 842                         sc.ignet_push_shares = nptr;
 843                 }
 844                 if (sc.misc != NULL) {
 845                         fwrite(sc.misc, strlen(sc.misc), 1, fp);
 846                 }
 847                 free(sc.misc);
 848
 849                 fclose(fp);
 850         }
 851         end_critical_section(S_NETCONFIGS);
 852 }
 853
 854
 855
 856 /*
 857  * Send the *entire* contents of the current room to one specific network node,
 858  * ignoring anything we know about which messages have already undergone
 859  * network processing.  This can be used to bring a new node into sync.
 860  */
 861 int network_sync_to(char *target_node) {
 862         struct SpoolControl sc;
 863         int num_spooled = 0;
 864
 865         /* Concise syntax because we don't need a full linked-list */
 866         memset(&sc, 0, sizeof(struct SpoolControl));
 867         sc.ignet_push_shares = (struct namelist *)
 868                 malloc(sizeof(struct namelist));
 869         sc.ignet_push_shares->next = NULL;
 870         safestrncpy(sc.ignet_push_shares->name,
 871                 target_node,
 872                 sizeof sc.ignet_push_shares->name);
 873
 874         /* Send ALL messages */
 875         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL,
 876                 network_spool_msg, &sc);
 877
 878         /* Concise cleanup because we know there's only one node in the sc */
 879         free(sc.ignet_push_shares);
 880
 881         lprintf(CTDL_INFO, "Synchronized %d messages to <%s>\n",
 882                 num_spooled, target_node);
 883         return(num_spooled);
 884 }
 885
 886
 887 /*
 888  * Implements the NSYN command
 889  */
 890 void cmd_nsyn(char *argbuf) {
 891         int num_spooled;
 892         char target_node[SIZ];
 893
 894         if (CtdlAccessCheck(ac_aide)) return;
 895
 896         extract(target_node, argbuf, 0);
 897         num_spooled = network_sync_to(target_node);
 898         cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
 899 }
 900
 901
 902
 903 /*
 904  * Batch up and send all outbound traffic from the current room
 905  */
 906 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
 907         struct RoomProcList *ptr;
 908
 909         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
 910         if (ptr == NULL) return;
 911
 912         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
 913         ptr->next = rplist;
 914         rplist = ptr;
 915 }
 916
 917
 918 /*
 919  * Learn topology from path fields
 920  */
 921 void network_learn_topology(char *node, char *path) {
 922         char nexthop[SIZ];
 923         struct NetMap *nmptr;
 924
 925         strcpy(nexthop, "");
 926
 927         if (num_tokens(path, '!') < 3) return;
 928         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 929                 if (!strcasecmp(nmptr->nodename, node)) {
 930                         extract_token(nmptr->nexthop, path, 0, '!');
 931                         nmptr->lastcontact = time(NULL);
 932                         return;
 933                 }
 934         }
 935
 936         /* If we got here then it's not in the map, so add it. */
 937         nmptr = (struct NetMap *) malloc(sizeof (struct NetMap));
 938         strcpy(nmptr->nodename, node);
 939         nmptr->lastcontact = time(NULL);
 940         extract_token(nmptr->nexthop, path, 0, '!');
 941         nmptr->next = the_netmap;
 942         the_netmap = nmptr;
 943 }
 944
 945
 946
 947
 948 /*
 949  * Bounce a message back to the sender
 950  */
 951 void network_bounce(struct CtdlMessage *msg, char *reason) {
 952         char *oldpath = NULL;
 953         char buf[SIZ];
 954         char bouncesource[SIZ];
 955         char recipient[SIZ];
 956         struct recptypes *valid = NULL;
 957         char force_room[ROOMNAMELEN];
 958         static int serialnum = 0;
 959         size_t size;
 960
 961         lprintf(CTDL_DEBUG, "entering network_bounce()\n");
 962
 963         if (msg == NULL) return;
 964
 965         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
 966
 967         /*
 968          * Give it a fresh message ID
 969          */
 970         if (msg->cm_fields['I'] != NULL) {
 971                 free(msg->cm_fields['I']);
 972         }
 973         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
 974                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
 975         msg->cm_fields['I'] = strdup(buf);
 976
 977         /*
 978          * FIXME ... right now we're just sending a bounce; we really want to
 979          * include the text of the bounced message.
 980          */
 981         if (msg->cm_fields['M'] != NULL) {
 982                 free(msg->cm_fields['M']);
 983         }
 984         msg->cm_fields['M'] = strdup(reason);
 985         msg->cm_format_type = 0;
 986
 987         /*
 988          * Turn the message around
 989          */
 990         if (msg->cm_fields['R'] == NULL) {
 991                 free(msg->cm_fields['R']);
 992         }
 993
 994         if (msg->cm_fields['D'] == NULL) {
 995                 free(msg->cm_fields['D']);
 996         }
 997
 998         snprintf(recipient, sizeof recipient, "%s@%s",
 999                 msg->cm_fields['A'], msg->cm_fields['N']);
1000
1001         if (msg->cm_fields['A'] == NULL) {
1002                 free(msg->cm_fields['A']);
1003         }
1004
1005         if (msg->cm_fields['N'] == NULL) {
1006                 free(msg->cm_fields['N']);
1007         }
1008
1009         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1010         msg->cm_fields['N'] = strdup(config.c_nodename);
1011
1012
1013         /* prepend our node to the path */
1014         if (msg->cm_fields['P'] != NULL) {
1015                 oldpath = msg->cm_fields['P'];
1016                 msg->cm_fields['P'] = NULL;
1017         }
1018         else {
1019                 oldpath = strdup("unknown_user");
1020         }
1021         size = strlen(oldpath) + SIZ;
1022         msg->cm_fields['P'] = malloc(size);
1023         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1024         free(oldpath);
1025
1026         /* Now submit the message */
1027         valid = validate_recipients(recipient);
1028         if (valid != NULL) if (valid->num_error > 0) {
1029                 free(valid);
1030                 valid = NULL;
1031         }
1032         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1033                 strcpy(force_room, config.c_aideroom);
1034         }
1035         else {
1036                 strcpy(force_room, "");
1037         }
1038         if ( (valid == NULL) && (strlen(force_room) == 0) ) {
1039                 strcpy(force_room, config.c_aideroom);
1040         }
1041         CtdlSubmitMsg(msg, valid, force_room);
1042
1043         /* Clean up */
1044         if (valid != NULL) free(valid);
1045         CtdlFreeMessage(msg);
1046         lprintf(CTDL_DEBUG, "leaving network_bounce()\n");
1047 }
1048
1049
1050
1051
1052 /*
1053  * Process a buffer containing a single message from a single file
1054  * from the inbound queue
1055  */
1056 void network_process_buffer(char *buffer, long size) {
1057         struct CtdlMessage *msg;
1058         long pos;
1059         int field;
1060         struct recptypes *recp = NULL;
1061         char target_room[ROOMNAMELEN];
1062         struct ser_ret sermsg;
1063         char *oldpath = NULL;
1064         char filename[SIZ];
1065         FILE *fp;
1066         char nexthop[SIZ];
1067         unsigned char firstbyte;
1068         unsigned char lastbyte;
1069
1070         /* Validate just a little bit.  First byte should be FF and
1071          * last byte should be 00.
1072          */
1073         memcpy(&firstbyte, &buffer[0], 1);
1074         memcpy(&lastbyte, &buffer[size-1], 1);
1075         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1076                 lprintf(CTDL_ERR, "Corrupt message!  Ignoring.\n");
1077                 return;
1078         }
1079
1080         /* Set default target room to trash */
1081         strcpy(target_room, TWITROOM);
1082
1083         /* Load the message into memory */
1084         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1085         memset(msg, 0, sizeof(struct CtdlMessage));
1086         msg->cm_magic = CTDLMESSAGE_MAGIC;
1087         msg->cm_anon_type = buffer[1];
1088         msg->cm_format_type = buffer[2];
1089
1090         for (pos = 3; pos < size; ++pos) {
1091                 field = buffer[pos];
1092                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1093                 pos = pos + strlen(&buffer[(int)pos]);
1094         }
1095
1096         /* Check for message routing */
1097         if (msg->cm_fields['D'] != NULL) {
1098                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1099
1100                         /* route the message */
1101                         strcpy(nexthop, "");
1102                         if (is_valid_node(nexthop, NULL,
1103                            msg->cm_fields['D']) == 0) {
1104
1105                                 /* prepend our node to the path */
1106                                 if (msg->cm_fields['P'] != NULL) {
1107                                         oldpath = msg->cm_fields['P'];
1108                                         msg->cm_fields['P'] = NULL;
1109                                 }
1110                                 else {
1111                                         oldpath = strdup("unknown_user");
1112                                 }
1113                                 size = strlen(oldpath) + SIZ;
1114                                 msg->cm_fields['P'] = malloc(size);
1115                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1116                                         config.c_nodename, oldpath);
1117                                 free(oldpath);
1118
1119                                 /* serialize the message */
1120                                 serialize_message(&sermsg, msg);
1121
1122                                 /* now send it */
1123                                 if (strlen(nexthop) == 0) {
1124                                         strcpy(nexthop, msg->cm_fields['D']);
1125                                 }
1126                                 snprintf(filename, sizeof filename,
1127                                         "./network/spoolout/%s", nexthop);
1128                                 fp = fopen(filename, "ab");
1129                                 if (fp != NULL) {
1130                                         fwrite(sermsg.ser,
1131                                                 sermsg.len, 1, fp);
1132                                         fclose(fp);
1133                                 }
1134                                 free(sermsg.ser);
1135                                 CtdlFreeMessage(msg);
1136                                 return;
1137                         }
1138
1139                         else {  /* invalid destination node name */
1140
1141                                 network_bounce(msg,
1142 "A message you sent could not be delivered due to an invalid destination node"
1143 " name.  Please check the address and try sending the message again.\n");
1144                                 msg = NULL;
1145                                 return;
1146
1147                         }
1148                 }
1149         }
1150
1151         /*
1152          * Check to see if we already have a copy of this message, and
1153          * abort its processing if so.  (We used to post a warning to Aide>
1154          * every time this happened, but the network is now so densely
1155          * connected that it's inevitable.)
1156          */
1157         if (network_usetable(msg) != 0) {
1158                 return;
1159         }
1160
1161         /* Learn network topology from the path */
1162         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1163                 network_learn_topology(msg->cm_fields['N'],
1164                                         msg->cm_fields['P']);
1165         }
1166
1167         /* Is the sending node giving us a very persuasive suggestion about
1168          * which room this message should be saved in?  If so, go with that.
1169          */
1170         if (msg->cm_fields['C'] != NULL) {
1171                 safestrncpy(target_room,
1172                         msg->cm_fields['C'],
1173                         sizeof target_room);
1174         }
1175
1176         /* Otherwise, does it have a recipient?  If so, validate it... */
1177         else if (msg->cm_fields['R'] != NULL) {
1178                 recp = validate_recipients(msg->cm_fields['R']);
1179                 if (recp != NULL) if (recp->num_error > 0) {
1180                         network_bounce(msg,
1181 "A message you sent could not be delivered due to an invalid address.\n"
1182 "Please check the address and try sending the message again.\n");
1183                         msg = NULL;
1184                         free(recp);
1185                         return;
1186                 }
1187                 strcpy(target_room, "");        /* no target room if mail */
1188         }
1189
1190         /* Our last shot at finding a home for this message is to see if
1191          * it has the O field (Originating room) set.
1192          */
1193         else if (msg->cm_fields['O'] != NULL) {
1194                 safestrncpy(target_room,
1195                         msg->cm_fields['O'],
1196                         sizeof target_room);
1197         }
1198
1199         /* Strip out fields that are only relevant during transit */
1200         if (msg->cm_fields['D'] != NULL) {
1201                 free(msg->cm_fields['D']);
1202                 msg->cm_fields['D'] = NULL;
1203         }
1204         if (msg->cm_fields['C'] != NULL) {
1205                 free(msg->cm_fields['C']);
1206                 msg->cm_fields['C'] = NULL;
1207         }
1208
1209         /* save the message into a room */
1210         if (PerformNetprocHooks(msg, target_room) == 0) {
1211                 msg->cm_flags = CM_SKIP_HOOKS;
1212                 CtdlSubmitMsg(msg, recp, target_room);
1213         }
1214         CtdlFreeMessage(msg);
1215         free(recp);
1216 }
1217
1218
1219 /*
1220  * Process a single message from a single file from the inbound queue
1221  */
1222 void network_process_message(FILE *fp, long msgstart, long msgend) {
1223         long hold_pos;
1224         long size;
1225         char *buffer;
1226
1227         hold_pos = ftell(fp);
1228         size = msgend - msgstart + 1;
1229         buffer = malloc(size);
1230         if (buffer != NULL) {
1231                 fseek(fp, msgstart, SEEK_SET);
1232                 fread(buffer, size, 1, fp);
1233                 network_process_buffer(buffer, size);
1234                 free(buffer);
1235         }
1236
1237         fseek(fp, hold_pos, SEEK_SET);
1238 }
1239
1240
1241 /*
1242  * Process a single file from the inbound queue
1243  */
1244 void network_process_file(char *filename) {
1245         FILE *fp;
1246         long msgstart = (-1L);
1247         long msgend = (-1L);
1248         long msgcur = 0L;
1249         int ch;
1250
1251
1252         fp = fopen(filename, "rb");
1253         if (fp == NULL) {
1254                 lprintf(CTDL_CRIT, "Error opening %s: %s\n",
1255                         filename, strerror(errno));
1256                 return;
1257         }
1258
1259         lprintf(CTDL_INFO, "network: processing <%s>\n", filename);
1260
1261         /* Look for messages in the data stream and break them out */
1262         while (ch = getc(fp), ch >= 0) {
1263
1264                 if (ch == 255) {
1265                         if (msgstart >= 0L) {
1266                                 msgend = msgcur - 1;
1267                                 network_process_message(fp, msgstart, msgend);
1268                         }
1269                         msgstart = msgcur;
1270                 }
1271
1272                 ++msgcur;
1273         }
1274
1275         msgend = msgcur - 1;
1276         if (msgstart >= 0L) {
1277                 network_process_message(fp, msgstart, msgend);
1278         }
1279
1280         fclose(fp);
1281         unlink(filename);
1282 }
1283
1284
1285 /*
1286  * Process anything in the inbound queue
1287  */
1288 void network_do_spoolin(void) {
1289         DIR *dp;
1290         struct dirent *d;
1291         char filename[SIZ];
1292
1293         dp = opendir("./network/spoolin");
1294         if (dp == NULL) return;
1295
1296         while (d = readdir(dp), d != NULL) {
1297                 snprintf(filename, sizeof filename,
1298                         "./network/spoolin/%s", d->d_name);
1299                 network_process_file(filename);
1300         }
1301
1302
1303         closedir(dp);
1304 }
1305
1306
1307 /*
1308  * Delete any files in the outbound queue that were intended
1309  * to be sent to nodes which no longer exist.
1310  */
1311 void network_purge_spoolout(void) {
1312         DIR *dp;
1313         struct dirent *d;
1314         char filename[SIZ];
1315         char nexthop[SIZ];
1316         int i;
1317
1318         dp = opendir("./network/spoolout");
1319         if (dp == NULL) return;
1320
1321         while (d = readdir(dp), d != NULL) {
1322                 snprintf(filename, sizeof filename,
1323                         "./network/spoolout/%s", d->d_name);
1324
1325                 strcpy(nexthop, "");
1326                 i = is_valid_node(nexthop, NULL, d->d_name);
1327
1328                 if ( (i != 0) || (strlen(nexthop) > 0) ) {
1329                         unlink(filename);
1330                 }
1331         }
1332
1333
1334         closedir(dp);
1335 }
1336
1337
1338
1339 /*
1340  * receive network spool from the remote system
1341  */
1342 void receive_spool(int sock, char *remote_nodename) {
1343         long download_len;
1344         long bytes_received;
1345         char buf[SIZ];
1346         static char pbuf[IGNET_PACKET_SIZE];
1347         char tempfilename[PATH_MAX];
1348         long plen;
1349         FILE *fp;
1350
1351         strcpy(tempfilename, tmpnam(NULL));
1352         if (sock_puts(sock, "NDOP") < 0) return;
1353         if (sock_gets(sock, buf) < 0) return;
1354         lprintf(CTDL_DEBUG, "<%s\n", buf);
1355         if (buf[0] != '2') {
1356                 return;
1357         }
1358         download_len = extract_long(&buf[4], 0);
1359
1360         bytes_received = 0L;
1361         fp = fopen(tempfilename, "w");
1362         if (fp == NULL) {
1363                 lprintf(CTDL_CRIT, "cannot open download file locally: %s\n",
1364                         strerror(errno));
1365                 return;
1366         }
1367
1368         while (bytes_received < download_len) {
1369                 snprintf(buf, sizeof buf, "READ %ld|%ld",
1370                         bytes_received,
1371                      ((download_len - bytes_received > IGNET_PACKET_SIZE)
1372                  ? IGNET_PACKET_SIZE : (download_len - bytes_received)));
1373                 if (sock_puts(sock, buf) < 0) {
1374                         fclose(fp);
1375                         unlink(tempfilename);
1376                         return;
1377                 }
1378                 if (sock_gets(sock, buf) < 0) {
1379                         fclose(fp);
1380                         unlink(tempfilename);
1381                         return;
1382                 }
1383                 if (buf[0] == '6') {
1384                         plen = extract_long(&buf[4], 0);
1385                         if (sock_read(sock, pbuf, plen) < 0) {
1386                                 fclose(fp);
1387                                 unlink(tempfilename);
1388                                 return;
1389                         }
1390                         fwrite((char *) pbuf, plen, 1, fp);
1391                         bytes_received = bytes_received + plen;
1392                 }
1393         }
1394
1395         fclose(fp);
1396         if (sock_puts(sock, "CLOS") < 0) {
1397                 unlink(tempfilename);
1398                 return;
1399         }
1400         if (sock_gets(sock, buf) < 0) {
1401                 unlink(tempfilename);
1402                 return;
1403         }
1404         lprintf(CTDL_DEBUG, "%s\n", buf);
1405         snprintf(buf, sizeof buf, "mv %s ./network/spoolin/%s.%ld",
1406                 tempfilename, remote_nodename, (long) getpid());
1407         system(buf);
1408 }
1409
1410
1411
1412 /*
1413  * transmit network spool to the remote system
1414  */
1415 void transmit_spool(int sock, char *remote_nodename)
1416 {
1417         char buf[SIZ];
1418         char pbuf[4096];
1419         long plen;
1420         long bytes_to_write, thisblock;
1421         int fd;
1422         char sfname[128];
1423
1424         if (sock_puts(sock, "NUOP") < 0) return;
1425         if (sock_gets(sock, buf) < 0) return;
1426         lprintf(CTDL_DEBUG, "<%s\n", buf);
1427         if (buf[0] != '2') {
1428                 return;
1429         }
1430
1431         snprintf(sfname, sizeof sfname, "./network/spoolout/%s", remote_nodename);
1432         fd = open(sfname, O_RDONLY);
1433         if (fd < 0) {
1434                 if (errno == ENOENT) {
1435                         lprintf(CTDL_INFO, "Nothing to send.\n");
1436                 } else {
1437                         lprintf(CTDL_CRIT, "cannot open upload file locally: %s\n",
1438                                 strerror(errno));
1439                 }
1440                 return;
1441         }
1442         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
1443                 bytes_to_write = plen;
1444                 while (bytes_to_write > 0L) {
1445                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
1446                         if (sock_puts(sock, buf) < 0) {
1447                                 close(fd);
1448                                 return;
1449                         }
1450                         if (sock_gets(sock, buf) < 0) {
1451                                 close(fd);
1452                                 return;
1453                         }
1454                         thisblock = atol(&buf[4]);
1455                         if (buf[0] == '7') {
1456                                 if (sock_write(sock, pbuf,
1457                                    (int) thisblock) < 0) {
1458                                         close(fd);
1459                                         return;
1460                                 }
1461                                 bytes_to_write = bytes_to_write - thisblock;
1462                         } else {
1463                                 goto ABORTUPL;
1464                         }
1465                 }
1466         }
1467
1468 ABORTUPL:
1469         close(fd);
1470         if (sock_puts(sock, "UCLS 1") < 0) return;
1471         if (sock_gets(sock, buf) < 0) return;
1472         lprintf(CTDL_DEBUG, "<%s\n", buf);
1473         if (buf[0] == '2') {
1474                 unlink(sfname);
1475         }
1476 }
1477
1478
1479
1480 /*
1481  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
1482  */
1483 void network_poll_node(char *node, char *secret, char *host, char *port) {
1484         int sock;
1485         char buf[SIZ];
1486
1487         if (network_talking_to(node, NTT_CHECK)) return;
1488         network_talking_to(node, NTT_ADD);
1489         lprintf(CTDL_INFO, "Polling node <%s> at %s:%s\n", node, host, port);
1490
1491         sock = sock_connect(host, port, "tcp");
1492         if (sock < 0) {
1493                 lprintf(CTDL_ERR, "Could not connect: %s\n", strerror(errno));
1494                 network_talking_to(node, NTT_REMOVE);
1495                 return;
1496         }
1497
1498         lprintf(CTDL_DEBUG, "Connected!\n");
1499
1500         /* Read the server greeting */
1501         if (sock_gets(sock, buf) < 0) goto bail;
1502         lprintf(CTDL_DEBUG, ">%s\n", buf);
1503
1504         /* Identify ourselves */
1505         snprintf(buf, sizeof buf, "NETP %s|%s", config.c_nodename, secret);
1506         lprintf(CTDL_DEBUG, "<%s\n", buf);
1507         if (sock_puts(sock, buf) <0) goto bail;
1508         if (sock_gets(sock, buf) < 0) goto bail;
1509         lprintf(CTDL_DEBUG, ">%s\n", buf);
1510         if (buf[0] != '2') goto bail;
1511
1512         /* At this point we are authenticated. */
1513         receive_spool(sock, node);
1514         transmit_spool(sock, node);
1515
1516         sock_puts(sock, "QUIT");
1517 bail:   sock_close(sock);
1518         network_talking_to(node, NTT_REMOVE);
1519 }
1520
1521
1522
1523 /*
1524  * Poll other Citadel nodes and transfer inbound/outbound network data.
1525  * Set "full" to nonzero to force a poll of every node, or to zero to poll
1526  * only nodes to which we have data to send.
1527  */
1528 void network_poll_other_citadel_nodes(int full_poll) {
1529         int i;
1530         char linebuf[SIZ];
1531         char node[SIZ];
1532         char host[SIZ];
1533         char port[SIZ];
1534         char secret[SIZ];
1535         int poll = 0;
1536         char spoolfile[SIZ];
1537
1538         if (ignetcfg == NULL) return;   /* no nodes defined */
1539
1540         /* Use the string tokenizer to grab one line at a time */
1541         for (i=0; i<num_tokens(ignetcfg, '\n'); ++i) {
1542                 extract_token(linebuf, ignetcfg, i, '\n');
1543                 extract(node, linebuf, 0);
1544                 extract(secret, linebuf, 1);
1545                 extract(host, linebuf, 2);
1546                 extract(port, linebuf, 3);
1547                 if ( (strlen(node) > 0) && (strlen(secret) > 0)
1548                    && (strlen(host) > 0) && strlen(port) > 0) {
1549                         poll = full_poll;
1550                         if (poll == 0) {
1551                                 sprintf(spoolfile, "./network/spoolout/%s",
1552                                         node);
1553                                 if (access(spoolfile, R_OK) == 0) {
1554                                         poll = 1;
1555                                 }
1556                         }
1557                         if (poll) {
1558                                 network_poll_node(node, secret, host, port);
1559                         }
1560                 }
1561         }
1562
1563 }
1564
1565
1566
1567
1568
1569
1570
1571 /*
1572  * network_do_queue()
1573  *
1574  * Run through the rooms doing various types of network stuff.
1575  */
1576 void network_do_queue(void) {
1577         static time_t last_run = 0L;
1578         struct RoomProcList *ptr;
1579         int full_processing = 1;
1580
1581         /*
1582          * Run the full set of processing tasks no more frequently
1583          * than once every n seconds
1584          */
1585         if ( (time(NULL) - last_run) < config.c_net_freq ) {
1586                 full_processing = 0;
1587         }
1588
1589         /*
1590          * This is a simple concurrency check to make sure only one queue run
1591          * is done at a time.  We could do this with a mutex, but since we
1592          * don't really require extremely fine granularity here, we'll do it
1593          * with a static variable instead.
1594          */
1595         if (doing_queue) return;
1596         doing_queue = 1;
1597
1598         /* Load the IGnet Configuration into memory */
1599         if (ignetcfg == NULL) {
1600                 ignetcfg = CtdlGetSysConfig(IGNETCFG);
1601         }
1602
1603         /*
1604          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
1605          * then we poll everyone.  Otherwise we only poll nodes we have stuff
1606          * to send to.
1607          */
1608         network_poll_other_citadel_nodes(full_processing);
1609
1610         /*
1611          * Load the network map and filter list into memory.
1612          */
1613         read_network_map();
1614         filterlist = load_filter_list();
1615
1616         /*
1617          * Go ahead and run the queue
1618          */
1619         if (full_processing) {
1620                 lprintf(CTDL_INFO, "network: loading outbound queue\n");
1621                 ForEachRoom(network_queue_room, NULL);
1622
1623                 lprintf(CTDL_INFO, "network: running outbound queue\n");
1624                 while (rplist != NULL) {
1625                         network_spoolout_room(rplist->name);
1626                         ptr = rplist;
1627                         rplist = rplist->next;
1628                         free(ptr);
1629                 }
1630         }
1631
1632         lprintf(CTDL_INFO, "network: processing inbound queue\n");
1633         network_do_spoolin();
1634
1635         /* Save the network map back to disk */
1636         write_network_map();
1637
1638         /* Free the filter list in memory */
1639         free_filter_list(filterlist);
1640         filterlist = NULL;
1641
1642         network_purge_spoolout();
1643
1644         lprintf(CTDL_INFO, "network: queue run completed\n");
1645
1646         if (full_processing) {
1647                 last_run = time(NULL);
1648         }
1649
1650         doing_queue = 0;
1651 }
1652
1653
1654 /*
1655  * cmd_netp() - authenticate to the server as another Citadel node polling
1656  *              for network traffic
1657  */
1658 void cmd_netp(char *cmdbuf)
1659 {
1660         char node[SIZ];
1661         char pass[SIZ];
1662
1663         char secret[SIZ];
1664         char nexthop[SIZ];
1665
1666         if (doing_queue) {
1667                 cprintf("%d spooling - try again in a few minutes\n", ERROR + RESOURCE_BUSY);
1668                 return;
1669         }
1670
1671         extract(node, cmdbuf, 0);
1672         extract(pass, cmdbuf, 1);
1673
1674         if (is_valid_node(nexthop, secret, node) != 0) {
1675                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
1676                 return;
1677         }
1678
1679         if (strcasecmp(pass, secret)) {
1680                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
1681                 return;
1682         }
1683
1684         if (network_talking_to(node, NTT_CHECK)) {
1685                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
1686                 return;
1687         }
1688
1689         safestrncpy(CC->net_node, node, sizeof CC->net_node);
1690         network_talking_to(node, NTT_ADD);
1691         cprintf("%d authenticated as network node '%s'\n", CIT_OK,
1692                 CC->net_node);
1693 }
1694
1695
1696 /*
1697  * This handler detects changes being made to the system's IGnet
1698  * configuration.
1699  */
1700 int netconfig_aftersave(struct CtdlMessage *msg) {
1701         char *ptr;
1702         int linelen;
1703
1704         /* If this isn't the configuration room, or if this isn't a MIME
1705          * message, don't bother.
1706          */
1707         if (strcasecmp(msg->cm_fields['O'], SYSCONFIGROOM)) return(0);
1708         if (msg->cm_format_type != 4) return(0);
1709
1710         ptr = msg->cm_fields['M'];
1711         while (ptr != NULL) {
1712
1713                 linelen = strcspn(ptr, "\n");
1714                 if (linelen == 0) return(0);    /* end of headers */
1715
1716                 if (!strncasecmp(ptr, "Content-type: ", 14)) {
1717                         if (!strncasecmp(&ptr[14], IGNETCFG,
1718                            strlen(IGNETCFG))) {
1719                                 if (ignetcfg != NULL) free(ignetcfg);
1720                                 ignetcfg = NULL;
1721                         }
1722                 }
1723
1724                 ptr = strchr((char *)ptr, '\n');
1725                 if (ptr != NULL) ++ptr;
1726         }
1727
1728         return(0);
1729 }
1730
1731
1732
1733
1734 /*
1735  * Module entry point
1736  */
1737 char *serv_network_init(void)
1738 {
1739         CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
1740         CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
1741         CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
1742         CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
1743         CtdlRegisterSessionHook(network_do_queue, EVT_TIMER);
1744         CtdlRegisterMessageHook(netconfig_aftersave, EVT_AFTERSAVE);
1745         return "$Id$";
1746 }