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