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 char *working_ignetcfg = NULL;
  91
  92 /*
  93  * Keep track of what messages to reject
  94  */
  95 struct FilterList *load_filter_list(void) {
  96         char *serialized_list = NULL;
  97         int i;
  98         char buf[SIZ];
  99         struct FilterList *newlist = NULL;
 100         struct FilterList *nptr;
 101
 102         serialized_list = CtdlGetSysConfig(FILTERLIST);
 103         if (serialized_list == NULL) return(NULL); /* if null, no entries */
 104
 105         /* Use the string tokenizer to grab one line at a time */
 106         for (i=0; i<num_tokens(serialized_list, '\n'); ++i) {
 107                 extract_token(buf, serialized_list, i, '\n');
 108                 nptr = (struct FilterList *) malloc(sizeof(struct FilterList));
 109                 extract(nptr->fl_user, buf, 0);
 110                 striplt(nptr->fl_user);
 111                 extract(nptr->fl_room, buf, 1);
 112                 striplt(nptr->fl_room);
 113                 extract(nptr->fl_node, buf, 2);
 114                 striplt(nptr->fl_node);
 115
 116                 /* Cowardly refuse to add an any/any/any entry that would
 117                  * end up filtering every single message.
 118                  */
 119                 if (strlen(nptr->fl_user) + strlen(nptr->fl_room)
 120                    + strlen(nptr->fl_node) == 0) {
 121                         free(nptr);
 122                 }
 123                 else {
 124                         nptr->next = newlist;
 125                         newlist = nptr;
 126                 }
 127         }
 128
 129         free(serialized_list);
 130         return newlist;
 131 }
 132
 133
 134 void free_filter_list(struct FilterList *fl) {
 135         if (fl == NULL) return;
 136         free_filter_list(fl->next);
 137         free(fl);
 138 }
 139
 140
 141
 142 /*
 143  * Check the use table.  This is a list of messages which have recently
 144  * arrived on the system.  It is maintained and queried to prevent the same
 145  * message from being entered into the database multiple times if it happens
 146  * to arrive multiple times by accident.
 147  */
 148 int network_usetable(struct CtdlMessage *msg) {
 149
 150         char msgid[SIZ];
 151         struct cdbdata *cdbut;
 152         struct UseTable ut;
 153
 154         /* Bail out if we can't generate a message ID */
 155         if (msg == NULL) {
 156                 return(0);
 157         }
 158         if (msg->cm_fields['I'] == NULL) {
 159                 return(0);
 160         }
 161         if (strlen(msg->cm_fields['I']) == 0) {
 162                 return(0);
 163         }
 164
 165         /* Generate the message ID */
 166         strcpy(msgid, msg->cm_fields['I']);
 167         if (haschar(msgid, '@') == 0) {
 168                 strcat(msgid, "@");
 169                 if (msg->cm_fields['N'] != NULL) {
 170                         strcat(msgid, msg->cm_fields['N']);
 171                 }
 172                 else {
 173                         return(0);
 174                 }
 175         }
 176
 177         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 178         if (cdbut != NULL) {
 179                 cdb_free(cdbut);
 180                 return(1);
 181         }
 182
 183         /* If we got to this point, it's unique: add it. */
 184         strcpy(ut.ut_msgid, msgid);
 185         ut.ut_timestamp = time(NULL);
 186         cdb_store(CDB_USETABLE, msgid, strlen(msgid),
 187                 &ut, sizeof(struct UseTable) );
 188         return(0);
 189 }
 190
 191
 192 /*
 193  * Read the network map from its configuration file into memory.
 194  */
 195 void read_network_map(void) {
 196         char *serialized_map = NULL;
 197         int i;
 198         char buf[SIZ];
 199         struct NetMap *nmptr;
 200
 201         serialized_map = CtdlGetSysConfig(IGNETMAP);
 202         if (serialized_map == NULL) return;     /* if null, no entries */
 203
 204         /* Use the string tokenizer to grab one line at a time */
 205         for (i=0; i<num_tokens(serialized_map, '\n'); ++i) {
 206                 extract_token(buf, serialized_map, i, '\n');
 207                 nmptr = (struct NetMap *) malloc(sizeof(struct NetMap));
 208                 extract(nmptr->nodename, buf, 0);
 209                 nmptr->lastcontact = extract_long(buf, 1);
 210                 extract(nmptr->nexthop, buf, 2);
 211                 nmptr->next = the_netmap;
 212                 the_netmap = nmptr;
 213         }
 214
 215         free(serialized_map);
 216 }
 217
 218
 219 /*
 220  * Write the network map from memory back to the configuration file.
 221  */
 222 void write_network_map(void) {
 223         char *serialized_map = NULL;
 224         struct NetMap *nmptr;
 225
 226         serialized_map = strdup("");
 227
 228         if (the_netmap != NULL) {
 229                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 230                         serialized_map = realloc(serialized_map,
 231                                                 (strlen(serialized_map)+SIZ) );
 232                         if (strlen(nmptr->nodename) > 0) {
 233                                 snprintf(&serialized_map[strlen(serialized_map)],
 234                                         SIZ,
 235                                         "%s|%ld|%s\n",
 236                                         nmptr->nodename,
 237                                         (long)nmptr->lastcontact,
 238                                         nmptr->nexthop);
 239                         }
 240                 }
 241         }
 242
 243         CtdlPutSysConfig(IGNETMAP, serialized_map);
 244         free(serialized_map);
 245
 246         /* Now free the list */
 247         while (the_netmap != NULL) {
 248                 nmptr = the_netmap->next;
 249                 free(the_netmap);
 250                 the_netmap = nmptr;
 251         }
 252 }
 253
 254
 255
 256 /*
 257  * Check the network map and determine whether the supplied node name is
 258  * valid.  If it is not a neighbor node, supply the name of a neighbor node
 259  * which is the next hop.  If it *is* a neighbor node, we also fill in the
 260  * shared secret.
 261  */
 262 int is_valid_node(char *nexthop, char *secret, char *node) {
 263         int i;
 264         char linebuf[SIZ];
 265         char buf[SIZ];
 266         int retval;
 267         struct NetMap *nmptr;
 268
 269         if (node == NULL) {
 270                 return(-1);
 271         }
 272
 273         /*
 274          * First try the neighbor nodes
 275          */
 276         if (working_ignetcfg == NULL) {
 277                 if (nexthop != NULL) {
 278                         strcpy(nexthop, "");
 279                 }
 280                 return(-1);
 281         }
 282
 283         retval = (-1);
 284         if (nexthop != NULL) {
 285                 strcpy(nexthop, "");
 286         }
 287
 288         /* Use the string tokenizer to grab one line at a time */
 289         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
 290                 extract_token(linebuf, working_ignetcfg, i, '\n');
 291                 extract(buf, linebuf, 0);
 292                 if (!strcasecmp(buf, node)) {
 293                         if (nexthop != NULL) {
 294                                 strcpy(nexthop, "");
 295                         }
 296                         if (secret != NULL) {
 297                                 extract(secret, linebuf, 1);
 298                         }
 299                         retval = 0;
 300                 }
 301         }
 302
 303         if (retval == 0) {
 304                 return(retval);         /* yup, it's a direct neighbor */
 305         }
 306
 307         /*
 308          * If we get to this point we have to see if we know the next hop
 309          */
 310         if (the_netmap != NULL) {
 311                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 312                         if (!strcasecmp(nmptr->nodename, node)) {
 313                                 if (nexthop != NULL) {
 314                                         strcpy(nexthop, nmptr->nexthop);
 315                                 }
 316                                 return(0);
 317                         }
 318                 }
 319         }
 320
 321         /*
 322          * If we get to this point, the supplied node name is bogus.
 323          */
 324         lprintf(CTDL_ERR, "Invalid node name <%s>\n", node);
 325         return(-1);
 326 }
 327
 328
 329
 330
 331
 332 void cmd_gnet(char *argbuf) {
 333         char filename[SIZ];
 334         char buf[SIZ];
 335         FILE *fp;
 336
 337         if (CtdlAccessCheck(ac_room_aide)) return;
 338         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 339         cprintf("%d Network settings for room #%ld <%s>\n",
 340                 LISTING_FOLLOWS,
 341                 CC->room.QRnumber, CC->room.QRname);
 342
 343         fp = fopen(filename, "r");
 344         if (fp != NULL) {
 345                 while (fgets(buf, sizeof buf, fp) != NULL) {
 346                         buf[strlen(buf)-1] = 0;
 347                         cprintf("%s\n", buf);
 348                 }
 349                 fclose(fp);
 350         }
 351
 352         cprintf("000\n");
 353 }
 354
 355
 356 void cmd_snet(char *argbuf) {
 357         char tempfilename[SIZ];
 358         char filename[SIZ];
 359         char buf[SIZ];
 360         FILE *fp;
 361
 362         if (CtdlAccessCheck(ac_room_aide)) return;
 363         safestrncpy(tempfilename, tmpnam(NULL), sizeof tempfilename);
 364         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 365
 366         fp = fopen(tempfilename, "w");
 367         if (fp == NULL) {
 368                 cprintf("%d Cannot open %s: %s\n",
 369                         ERROR + INTERNAL_ERROR,
 370                         tempfilename,
 371                         strerror(errno));
 372         }
 373
 374         cprintf("%d %s\n", SEND_LISTING, tempfilename);
 375         while (client_gets(buf), strcmp(buf, "000")) {
 376                 fprintf(fp, "%s\n", buf);
 377         }
 378         fclose(fp);
 379
 380         /* Now copy the temp file to its permanent location
 381          * (We use /bin/mv instead of link() because they may be on
 382          * different filesystems)
 383          */
 384         unlink(filename);
 385         snprintf(buf, sizeof buf, "/bin/mv %s %s", tempfilename, filename);
 386         begin_critical_section(S_NETCONFIGS);
 387         system(buf);
 388         end_critical_section(S_NETCONFIGS);
 389 }
 390
 391
 392 /*
 393  * Spools out one message from the list.
 394  */
 395 void network_spool_msg(long msgnum, void *userdata) {
 396         struct SpoolControl *sc;
 397         int err;
 398         int i;
 399         char *newpath = NULL;
 400         char *instr = NULL;
 401         size_t instr_len = SIZ;
 402         struct CtdlMessage *msg = NULL;
 403         struct CtdlMessage *imsg;
 404         struct namelist *nptr;
 405         struct ser_ret sermsg;
 406         FILE *fp;
 407         char filename[SIZ];
 408         char buf[SIZ];
 409         int bang = 0;
 410         int send = 1;
 411         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 412
 413         sc = (struct SpoolControl *)userdata;
 414
 415         /*
 416          * Process mailing list recipients
 417          */
 418         if (sc->listrecps != NULL) {
 419
 420                 /* First, copy it to the spoolout room */
 421                 err = CtdlSaveMsgPointerInRoom(SMTP_SPOOLOUT_ROOM, msgnum, 0);
 422                 if (err != 0) return;
 423
 424                 /*
 425                  * Figure out how big a buffer we need to allocate
 426                  */
 427                 for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 428                         instr_len = instr_len + strlen(nptr->name);
 429                 }
 430
 431                 /*
 432                  * allocate...
 433                  */
 434                 lprintf(CTDL_DEBUG, "Generating delivery instructions\n");
 435                 instr = malloc(instr_len);
 436                 if (instr == NULL) {
 437                         lprintf(CTDL_EMERG, "Cannot allocate %ld bytes for instr...\n",
 438                                 (long)instr_len);
 439                         abort();
 440                 }
 441                 snprintf(instr, instr_len,
 442                         "Content-type: %s\n\nmsgid|%ld\nsubmitted|%ld\n"
 443                         "bounceto|postmaster@%s\n" ,
 444                         SPOOLMIME, msgnum, (long)time(NULL), config.c_fqdn );
 445
 446                 /* Generate delivery instructions for each recipient */
 447                 for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 448                         size_t tmp = strlen(instr);
 449                         snprintf(&instr[tmp], instr_len - tmp,
 450                                  "remote|%s|0||\n", nptr->name);
 451                 }
 452
 453                 /*
 454                  * Generate a message from the instructions
 455                  */
 456                 imsg = malloc(sizeof(struct CtdlMessage));
 457                 memset(imsg, 0, sizeof(struct CtdlMessage));
 458                 imsg->cm_magic = CTDLMESSAGE_MAGIC;
 459                 imsg->cm_anon_type = MES_NORMAL;
 460                 imsg->cm_format_type = FMT_RFC822;
 461                 imsg->cm_fields['A'] = strdup("Citadel");
 462                 imsg->cm_fields['M'] = instr;
 463
 464                 /* Save delivery instructions in spoolout room */
 465                 CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM);
 466                 CtdlFreeMessage(imsg);
 467         }
 468
 469         /*
 470          * Process digest recipients
 471          */
 472         if ((sc->digestrecps != NULL) && (sc->digestfp != NULL)) {
 473                 fprintf(sc->digestfp,   " -----------------------------------"
 474                                         "------------------------------------"
 475                                         "-------\n");
 476                 CtdlRedirectOutput(sc->digestfp, -1);
 477                 CtdlOutputMsg(msgnum, MT_RFC822, HEADERS_ALL, 0, 0);
 478                 CtdlRedirectOutput(NULL, -1);
 479                 sc->num_msgs_spooled += 1;
 480         }
 481
 482         /*
 483          * Process IGnet push shares
 484          */
 485         if (sc->ignet_push_shares != NULL) {
 486
 487                 msg = CtdlFetchMessage(msgnum, 1);
 488                 if (msg != NULL) {
 489                         size_t newpath_len;
 490
 491                         /* Prepend our node name to the Path field whenever
 492                          * sending a message to another IGnet node
 493                          */
 494                         if (msg->cm_fields['P'] == NULL) {
 495                                 msg->cm_fields['P'] = strdup("username");
 496                         }
 497                         newpath_len = strlen(msg->cm_fields['P']) +
 498                                  strlen(config.c_nodename) + 2;
 499                         newpath = malloc(newpath_len);
 500                         snprintf(newpath, newpath_len, "%s!%s",
 501                                  config.c_nodename, msg->cm_fields['P']);
 502                         free(msg->cm_fields['P']);
 503                         msg->cm_fields['P'] = newpath;
 504
 505                         /*
 506                          * Force the message to appear in the correct room
 507                          * on the far end by setting the C field correctly
 508                          */
 509                         if (msg->cm_fields['C'] != NULL) {
 510                                 free(msg->cm_fields['C']);
 511                         }
 512                         msg->cm_fields['C'] = strdup(CC->room.QRname);
 513
 514                         /*
 515                          * Determine if this message is set to be deleted
 516                          * after sending out on the network
 517                          */
 518                         if (msg->cm_fields['S'] != NULL) {
 519                                 if (!strcasecmp(msg->cm_fields['S'],
 520                                    "CANCEL")) {
 521                                         delete_after_send = 1;
 522                                 }
 523                         }
 524
 525                         /*
 526                          * Now serialize it for transmission
 527                          */
 528                         serialize_message(&sermsg, msg);
 529
 530                         /* Now send it to every node */
 531                         for (nptr = sc->ignet_push_shares; nptr != NULL;
 532                             nptr = nptr->next) {
 533
 534                                 send = 1;
 535
 536                                 /* Check for valid node name */
 537                                 if (is_valid_node(NULL, NULL, nptr->name) != 0) {
 538                                         lprintf(CTDL_ERR, "Invalid node <%s>\n",
 539                                                 nptr->name);
 540                                         send = 0;
 541                                 }
 542
 543                                 /* Check for split horizon */
 544                                 lprintf(CTDL_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 545                                 bang = num_tokens(msg->cm_fields['P'], '!');
 546                                 if (bang > 1) for (i=0; i<(bang-1); ++i) {
 547                                         extract_token(buf, msg->cm_fields['P'],
 548                                                 i, '!');
 549                                         if (!strcasecmp(buf, nptr->name)) {
 550                                                 send = 0;
 551                                         }
 552                                 }
 553
 554                                 /* Send the message */
 555                                 if (send == 1) {
 556                                         snprintf(filename, sizeof filename,
 557                                                 "./network/spoolout/%s",
 558                                                 nptr->name);
 559                                         fp = fopen(filename, "ab");
 560                                         if (fp != NULL) {
 561                                                 fwrite(sermsg.ser,
 562                                                         sermsg.len, 1, fp);
 563                                                 fclose(fp);
 564                                         }
 565                                 }
 566                         }
 567                         free(sermsg.ser);
 568                         CtdlFreeMessage(msg);
 569                 }
 570         }
 571
 572         /* update lastsent */
 573         sc->lastsent = msgnum;
 574
 575         /* Delete this message if delete-after-send is set */
 576         if (delete_after_send) {
 577                 CtdlDeleteMessages(CC->room.QRname, msgnum, "");
 578         }
 579
 580 }
 581
 582
 583 /*
 584  * Deliver digest messages
 585  */
 586 void network_deliver_digest(struct SpoolControl *sc) {
 587         char buf[SIZ];
 588         int i;
 589         struct CtdlMessage *msg;
 590         long msglen;
 591         long msgnum;
 592         char *instr = NULL;
 593         size_t instr_len = SIZ;
 594         struct CtdlMessage *imsg;
 595         struct namelist *nptr;
 596
 597         if (sc->num_msgs_spooled < 1) {
 598                 fclose(sc->digestfp);
 599                 sc->digestfp = NULL;
 600                 return;
 601         }
 602
 603         msg = malloc(sizeof(struct CtdlMessage));
 604         memset(msg, 0, sizeof(struct CtdlMessage));
 605         msg->cm_magic = CTDLMESSAGE_MAGIC;
 606         msg->cm_format_type = FMT_RFC822;
 607         msg->cm_anon_type = MES_NORMAL;
 608
 609         sprintf(buf, "%ld", time(NULL));
 610         msg->cm_fields['T'] = strdup(buf);
 611         msg->cm_fields['A'] = strdup(CC->room.QRname);
 612         msg->cm_fields['U'] = strdup(CC->room.QRname);
 613         sprintf(buf, "room_%s@%s", CC->room.QRname, config.c_fqdn);
 614         for (i=0; i<strlen(buf); ++i) {
 615                 if (isspace(buf[i])) buf[i]='_';
 616                 buf[i] = tolower(buf[i]);
 617         }
 618         msg->cm_fields['F'] = strdup(buf);
 619
 620         fseek(sc->digestfp, 0L, SEEK_END);
 621         msglen = ftell(sc->digestfp);
 622
 623         msg->cm_fields['M'] = malloc(msglen + 1);
 624         fseek(sc->digestfp, 0L, SEEK_SET);
 625         fread(msg->cm_fields['M'], (size_t)msglen, 1, sc->digestfp);
 626         msg->cm_fields['M'][msglen] = 0;
 627
 628         fclose(sc->digestfp);
 629         sc->digestfp = NULL;
 630
 631         msgnum = CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM);
 632         CtdlFreeMessage(msg);
 633
 634         /* Now generate the delivery instructions */
 635
 636         /*
 637          * Figure out how big a buffer we need to allocate
 638          */
 639         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 640                 instr_len = instr_len + strlen(nptr->name);
 641         }
 642
 643         /*
 644          * allocate...
 645          */
 646         lprintf(CTDL_DEBUG, "Generating delivery instructions\n");
 647         instr = malloc(instr_len);
 648         if (instr == NULL) {
 649                 lprintf(CTDL_EMERG, "Cannot allocate %ld bytes for instr...\n",
 650                         (long)instr_len);
 651                 abort();
 652         }
 653         snprintf(instr, instr_len,
 654                 "Content-type: %s\n\nmsgid|%ld\nsubmitted|%ld\n"
 655                 "bounceto|postmaster@%s\n" ,
 656                 SPOOLMIME, msgnum, (long)time(NULL), config.c_fqdn );
 657
 658         /* Generate delivery instructions for each recipient */
 659         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 660                 size_t tmp = strlen(instr);
 661                 snprintf(&instr[tmp], instr_len - tmp,
 662                          "remote|%s|0||\n", nptr->name);
 663         }
 664
 665         /*
 666          * Generate a message from the instructions
 667          */
 668         imsg = malloc(sizeof(struct CtdlMessage));
 669         memset(imsg, 0, sizeof(struct CtdlMessage));
 670         imsg->cm_magic = CTDLMESSAGE_MAGIC;
 671         imsg->cm_anon_type = MES_NORMAL;
 672         imsg->cm_format_type = FMT_RFC822;
 673         imsg->cm_fields['A'] = strdup("Citadel");
 674         imsg->cm_fields['M'] = instr;
 675
 676         /* Save delivery instructions in spoolout room */
 677         CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM);
 678         CtdlFreeMessage(imsg);
 679 }
 680
 681
 682 /*
 683  * Batch up and send all outbound traffic from the current room
 684  */
 685 void network_spoolout_room(char *room_to_spool) {
 686         char filename[SIZ];
 687         char buf[SIZ];
 688         char instr[SIZ];
 689         FILE *fp;
 690         struct SpoolControl sc;
 691         struct namelist *nptr = NULL;
 692         size_t miscsize = 0;
 693         size_t linesize = 0;
 694         int skipthisline = 0;
 695         int i;
 696
 697         if (getroom(&CC->room, room_to_spool) != 0) {
 698                 lprintf(CTDL_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
 699                 return;
 700         }
 701
 702         memset(&sc, 0, sizeof(struct SpoolControl));
 703         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 704
 705         begin_critical_section(S_NETCONFIGS);
 706
 707         fp = fopen(filename, "r");
 708         if (fp == NULL) {
 709                 end_critical_section(S_NETCONFIGS);
 710                 return;
 711         }
 712
 713         lprintf(CTDL_INFO, "Networking started for <%s>\n", CC->room.QRname);
 714
 715         while (fgets(buf, sizeof buf, fp) != NULL) {
 716                 buf[strlen(buf)-1] = 0;
 717
 718                 extract(instr, buf, 0);
 719                 if (!strcasecmp(instr, "lastsent")) {
 720                         sc.lastsent = extract_long(buf, 1);
 721                 }
 722                 else if (!strcasecmp(instr, "listrecp")) {
 723                         nptr = (struct namelist *)
 724                                 malloc(sizeof(struct namelist));
 725                         nptr->next = sc.listrecps;
 726                         extract(nptr->name, buf, 1);
 727                         sc.listrecps = nptr;
 728                 }
 729                 else if (!strcasecmp(instr, "digestrecp")) {
 730                         nptr = (struct namelist *)
 731                                 malloc(sizeof(struct namelist));
 732                         nptr->next = sc.digestrecps;
 733                         extract(nptr->name, buf, 1);
 734                         sc.digestrecps = nptr;
 735                 }
 736                 else if (!strcasecmp(instr, "ignet_push_share")) {
 737                         /* by checking each node's validity, we automatically
 738                          * purge nodes which do not exist from room network
 739                          * configurations at this time.
 740                          */
 741                         nptr = (struct namelist *)
 742                                 malloc(sizeof(struct namelist));
 743                         nptr->next = sc.ignet_push_shares;
 744                         extract(nptr->name, buf, 1);
 745                         if (is_valid_node(NULL, NULL, nptr->name) == 0) {
 746                                 sc.ignet_push_shares = nptr;
 747                         }
 748                         else {
 749                                 free(nptr);
 750                         }
 751                 }
 752                 else {
 753                         /* Preserve 'other' lines ... *unless* they happen to
 754                          * be subscribe/unsubscribe pendings with expired
 755                          * timestamps.
 756                          */
 757                         skipthisline = 0;
 758                         if (!strncasecmp(buf, "subpending|", 11)) {
 759                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
 760                                         skipthisline = 1;
 761                                 }
 762                         }
 763                         if (!strncasecmp(buf, "unsubpending|", 13)) {
 764                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
 765                                         skipthisline = 1;
 766                                 }
 767                         }
 768
 769                         if (skipthisline == 0) {
 770                                 linesize = strlen(buf);
 771                                 sc.misc = realloc(sc.misc,
 772                                         (miscsize + linesize + 2) );
 773                                 sprintf(&sc.misc[miscsize], "%s\n", buf);
 774                                 miscsize = miscsize + linesize + 1;
 775                         }
 776                 }
 777
 778
 779         }
 780         fclose(fp);
 781
 782         /* If there are digest recipients, we have to build a digest */
 783         if (sc.digestrecps != NULL) {
 784                 sc.digestfp = tmpfile();
 785                 fprintf(sc.digestfp, "Content-type: text/plain\n\n");
 786         }
 787
 788         /* Do something useful */
 789         CtdlForEachMessage(MSGS_GT, sc.lastsent, NULL, NULL,
 790                 network_spool_msg, &sc);
 791
 792         /* If we wrote a digest, deliver it and then close it */
 793         snprintf(buf, sizeof buf, "room_%s@%s",
 794                 CC->room.QRname, config.c_fqdn);
 795         for (i=0; i<strlen(buf); ++i) {
 796                 buf[i] = tolower(buf[i]);
 797                 if (isspace(buf[i])) buf[i] = '_';
 798         }
 799         if (sc.digestfp != NULL) {
 800                 fprintf(sc.digestfp,    " -----------------------------------"
 801                                         "------------------------------------"
 802                                         "-------\n"
 803                                         "You are subscribed to the '%s' "
 804                                         "list.\n"
 805                                         "To post to the list: %s\n",
 806                                         CC->room.QRname, buf
 807                 );
 808                 network_deliver_digest(&sc);    /* deliver and close */
 809         }
 810
 811         /* Now rewrite the config file */
 812         fp = fopen(filename, "w");
 813         if (fp == NULL) {
 814                 lprintf(CTDL_CRIT, "ERROR: cannot open %s: %s\n",
 815                         filename, strerror(errno));
 816         }
 817         else {
 818                 fprintf(fp, "lastsent|%ld\n", sc.lastsent);
 819
 820                 /* Write out the listrecps while freeing from memory at the
 821                  * same time.  Am I clever or what?  :)
 822                  */
 823                 while (sc.listrecps != NULL) {
 824                         fprintf(fp, "listrecp|%s\n", sc.listrecps->name);
 825                         nptr = sc.listrecps->next;
 826                         free(sc.listrecps);
 827                         sc.listrecps = nptr;
 828                 }
 829                 /* Do the same for digestrecps */
 830                 while (sc.digestrecps != NULL) {
 831                         fprintf(fp, "digestrecp|%s\n", sc.digestrecps->name);
 832                         nptr = sc.digestrecps->next;
 833                         free(sc.digestrecps);
 834                         sc.digestrecps = nptr;
 835                 }
 836                 while (sc.ignet_push_shares != NULL) {
 837                         /* by checking each node's validity, we automatically
 838                          * purge nodes which do not exist from room network
 839                          * configurations at this time.
 840                          */
 841                         if (is_valid_node(NULL, NULL, sc.ignet_push_shares->name) == 0) {
 842                         }
 843                         fprintf(fp, "ignet_push_share|%s\n",
 844                                 sc.ignet_push_shares->name);
 845                         nptr = sc.ignet_push_shares->next;
 846                         free(sc.ignet_push_shares);
 847                         sc.ignet_push_shares = nptr;
 848                 }
 849                 if (sc.misc != NULL) {
 850                         fwrite(sc.misc, strlen(sc.misc), 1, fp);
 851                 }
 852                 free(sc.misc);
 853
 854                 fclose(fp);
 855         }
 856         end_critical_section(S_NETCONFIGS);
 857 }
 858
 859
 860
 861 /*
 862  * Send the *entire* contents of the current room to one specific network node,
 863  * ignoring anything we know about which messages have already undergone
 864  * network processing.  This can be used to bring a new node into sync.
 865  */
 866 int network_sync_to(char *target_node) {
 867         struct SpoolControl sc;
 868         int num_spooled = 0;
 869
 870         /* Concise syntax because we don't need a full linked-list */
 871         memset(&sc, 0, sizeof(struct SpoolControl));
 872         sc.ignet_push_shares = (struct namelist *)
 873                 malloc(sizeof(struct namelist));
 874         sc.ignet_push_shares->next = NULL;
 875         safestrncpy(sc.ignet_push_shares->name,
 876                 target_node,
 877                 sizeof sc.ignet_push_shares->name);
 878
 879         /* Send ALL messages */
 880         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL,
 881                 network_spool_msg, &sc);
 882
 883         /* Concise cleanup because we know there's only one node in the sc */
 884         free(sc.ignet_push_shares);
 885
 886         lprintf(CTDL_INFO, "Synchronized %d messages to <%s>\n",
 887                 num_spooled, target_node);
 888         return(num_spooled);
 889 }
 890
 891
 892 /*
 893  * Implements the NSYN command
 894  */
 895 void cmd_nsyn(char *argbuf) {
 896         int num_spooled;
 897         char target_node[SIZ];
 898
 899         if (CtdlAccessCheck(ac_aide)) return;
 900
 901         extract(target_node, argbuf, 0);
 902         num_spooled = network_sync_to(target_node);
 903         cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
 904 }
 905
 906
 907
 908 /*
 909  * Batch up and send all outbound traffic from the current room
 910  */
 911 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
 912         struct RoomProcList *ptr;
 913
 914         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
 915         if (ptr == NULL) return;
 916
 917         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
 918         ptr->next = rplist;
 919         rplist = ptr;
 920 }
 921
 922
 923 /*
 924  * Learn topology from path fields
 925  */
 926 void network_learn_topology(char *node, char *path) {
 927         char nexthop[SIZ];
 928         struct NetMap *nmptr;
 929
 930         strcpy(nexthop, "");
 931
 932         if (num_tokens(path, '!') < 3) return;
 933         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 934                 if (!strcasecmp(nmptr->nodename, node)) {
 935                         extract_token(nmptr->nexthop, path, 0, '!');
 936                         nmptr->lastcontact = time(NULL);
 937                         return;
 938                 }
 939         }
 940
 941         /* If we got here then it's not in the map, so add it. */
 942         nmptr = (struct NetMap *) malloc(sizeof (struct NetMap));
 943         strcpy(nmptr->nodename, node);
 944         nmptr->lastcontact = time(NULL);
 945         extract_token(nmptr->nexthop, path, 0, '!');
 946         nmptr->next = the_netmap;
 947         the_netmap = nmptr;
 948 }
 949
 950
 951
 952
 953 /*
 954  * Bounce a message back to the sender
 955  */
 956 void network_bounce(struct CtdlMessage *msg, char *reason) {
 957         char *oldpath = NULL;
 958         char buf[SIZ];
 959         char bouncesource[SIZ];
 960         char recipient[SIZ];
 961         struct recptypes *valid = NULL;
 962         char force_room[ROOMNAMELEN];
 963         static int serialnum = 0;
 964         size_t size;
 965
 966         lprintf(CTDL_DEBUG, "entering network_bounce()\n");
 967
 968         if (msg == NULL) return;
 969
 970         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
 971
 972         /*
 973          * Give it a fresh message ID
 974          */
 975         if (msg->cm_fields['I'] != NULL) {
 976                 free(msg->cm_fields['I']);
 977         }
 978         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
 979                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
 980         msg->cm_fields['I'] = strdup(buf);
 981
 982         /*
 983          * FIXME ... right now we're just sending a bounce; we really want to
 984          * include the text of the bounced message.
 985          */
 986         if (msg->cm_fields['M'] != NULL) {
 987                 free(msg->cm_fields['M']);
 988         }
 989         msg->cm_fields['M'] = strdup(reason);
 990         msg->cm_format_type = 0;
 991
 992         /*
 993          * Turn the message around
 994          */
 995         if (msg->cm_fields['R'] == NULL) {
 996                 free(msg->cm_fields['R']);
 997         }
 998
 999         if (msg->cm_fields['D'] == NULL) {
1000                 free(msg->cm_fields['D']);
1001         }
1002
1003         snprintf(recipient, sizeof recipient, "%s@%s",
1004                 msg->cm_fields['A'], msg->cm_fields['N']);
1005
1006         if (msg->cm_fields['A'] == NULL) {
1007                 free(msg->cm_fields['A']);
1008         }
1009
1010         if (msg->cm_fields['N'] == NULL) {
1011                 free(msg->cm_fields['N']);
1012         }
1013
1014         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1015         msg->cm_fields['N'] = strdup(config.c_nodename);
1016
1017
1018         /* prepend our node to the path */
1019         if (msg->cm_fields['P'] != NULL) {
1020                 oldpath = msg->cm_fields['P'];
1021                 msg->cm_fields['P'] = NULL;
1022         }
1023         else {
1024                 oldpath = strdup("unknown_user");
1025         }
1026         size = strlen(oldpath) + SIZ;
1027         msg->cm_fields['P'] = malloc(size);
1028         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1029         free(oldpath);
1030
1031         /* Now submit the message */
1032         valid = validate_recipients(recipient);
1033         if (valid != NULL) if (valid->num_error > 0) {
1034                 free(valid);
1035                 valid = NULL;
1036         }
1037         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1038                 strcpy(force_room, config.c_aideroom);
1039         }
1040         else {
1041                 strcpy(force_room, "");
1042         }
1043         if ( (valid == NULL) && (strlen(force_room) == 0) ) {
1044                 strcpy(force_room, config.c_aideroom);
1045         }
1046         CtdlSubmitMsg(msg, valid, force_room);
1047
1048         /* Clean up */
1049         if (valid != NULL) free(valid);
1050         CtdlFreeMessage(msg);
1051         lprintf(CTDL_DEBUG, "leaving network_bounce()\n");
1052 }
1053
1054
1055
1056
1057 /*
1058  * Process a buffer containing a single message from a single file
1059  * from the inbound queue
1060  */
1061 void network_process_buffer(char *buffer, long size) {
1062         struct CtdlMessage *msg;
1063         long pos;
1064         int field;
1065         struct recptypes *recp = NULL;
1066         char target_room[ROOMNAMELEN];
1067         struct ser_ret sermsg;
1068         char *oldpath = NULL;
1069         char filename[SIZ];
1070         FILE *fp;
1071         char nexthop[SIZ];
1072         unsigned char firstbyte;
1073         unsigned char lastbyte;
1074
1075         /* Validate just a little bit.  First byte should be FF and
1076          * last byte should be 00.
1077          */
1078         memcpy(&firstbyte, &buffer[0], 1);
1079         memcpy(&lastbyte, &buffer[size-1], 1);
1080         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1081                 lprintf(CTDL_ERR, "Corrupt message!  Ignoring.\n");
1082                 return;
1083         }
1084
1085         /* Set default target room to trash */
1086         strcpy(target_room, TWITROOM);
1087
1088         /* Load the message into memory */
1089         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1090         memset(msg, 0, sizeof(struct CtdlMessage));
1091         msg->cm_magic = CTDLMESSAGE_MAGIC;
1092         msg->cm_anon_type = buffer[1];
1093         msg->cm_format_type = buffer[2];
1094
1095         for (pos = 3; pos < size; ++pos) {
1096                 field = buffer[pos];
1097                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1098                 pos = pos + strlen(&buffer[(int)pos]);
1099         }
1100
1101         /* Check for message routing */
1102         if (msg->cm_fields['D'] != NULL) {
1103                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1104
1105                         /* route the message */
1106                         strcpy(nexthop, "");
1107                         if (is_valid_node(nexthop, NULL,
1108                            msg->cm_fields['D']) == 0) {
1109
1110                                 /* prepend our node to the path */
1111                                 if (msg->cm_fields['P'] != NULL) {
1112                                         oldpath = msg->cm_fields['P'];
1113                                         msg->cm_fields['P'] = NULL;
1114                                 }
1115                                 else {
1116                                         oldpath = strdup("unknown_user");
1117                                 }
1118                                 size = strlen(oldpath) + SIZ;
1119                                 msg->cm_fields['P'] = malloc(size);
1120                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1121                                         config.c_nodename, oldpath);
1122                                 free(oldpath);
1123
1124                                 /* serialize the message */
1125                                 serialize_message(&sermsg, msg);
1126
1127                                 /* now send it */
1128                                 if (strlen(nexthop) == 0) {
1129                                         strcpy(nexthop, msg->cm_fields['D']);
1130                                 }
1131                                 snprintf(filename, sizeof filename,
1132                                         "./network/spoolout/%s", nexthop);
1133                                 fp = fopen(filename, "ab");
1134                                 if (fp != NULL) {
1135                                         fwrite(sermsg.ser,
1136                                                 sermsg.len, 1, fp);
1137                                         fclose(fp);
1138                                 }
1139                                 free(sermsg.ser);
1140                                 CtdlFreeMessage(msg);
1141                                 return;
1142                         }
1143
1144                         else {  /* invalid destination node name */
1145
1146                                 network_bounce(msg,
1147 "A message you sent could not be delivered due to an invalid destination node"
1148 " name.  Please check the address and try sending the message again.\n");
1149                                 msg = NULL;
1150                                 return;
1151
1152                         }
1153                 }
1154         }
1155
1156         /*
1157          * Check to see if we already have a copy of this message, and
1158          * abort its processing if so.  (We used to post a warning to Aide>
1159          * every time this happened, but the network is now so densely
1160          * connected that it's inevitable.)
1161          */
1162         if (network_usetable(msg) != 0) {
1163                 return;
1164         }
1165
1166         /* Learn network topology from the path */
1167         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1168                 network_learn_topology(msg->cm_fields['N'],
1169                                         msg->cm_fields['P']);
1170         }
1171
1172         /* Is the sending node giving us a very persuasive suggestion about
1173          * which room this message should be saved in?  If so, go with that.
1174          */
1175         if (msg->cm_fields['C'] != NULL) {
1176                 safestrncpy(target_room,
1177                         msg->cm_fields['C'],
1178                         sizeof target_room);
1179         }
1180
1181         /* Otherwise, does it have a recipient?  If so, validate it... */
1182         else if (msg->cm_fields['R'] != NULL) {
1183                 recp = validate_recipients(msg->cm_fields['R']);
1184                 if (recp != NULL) if (recp->num_error > 0) {
1185                         network_bounce(msg,
1186 "A message you sent could not be delivered due to an invalid address.\n"
1187 "Please check the address and try sending the message again.\n");
1188                         msg = NULL;
1189                         free(recp);
1190                         return;
1191                 }
1192                 strcpy(target_room, "");        /* no target room if mail */
1193         }
1194
1195         /* Our last shot at finding a home for this message is to see if
1196          * it has the O field (Originating room) set.
1197          */
1198         else if (msg->cm_fields['O'] != NULL) {
1199                 safestrncpy(target_room,
1200                         msg->cm_fields['O'],
1201                         sizeof target_room);
1202         }
1203
1204         /* Strip out fields that are only relevant during transit */
1205         if (msg->cm_fields['D'] != NULL) {
1206                 free(msg->cm_fields['D']);
1207                 msg->cm_fields['D'] = NULL;
1208         }
1209         if (msg->cm_fields['C'] != NULL) {
1210                 free(msg->cm_fields['C']);
1211                 msg->cm_fields['C'] = NULL;
1212         }
1213
1214         /* save the message into a room */
1215         if (PerformNetprocHooks(msg, target_room) == 0) {
1216                 msg->cm_flags = CM_SKIP_HOOKS;
1217                 CtdlSubmitMsg(msg, recp, target_room);
1218         }
1219         CtdlFreeMessage(msg);
1220         free(recp);
1221 }
1222
1223
1224 /*
1225  * Process a single message from a single file from the inbound queue
1226  */
1227 void network_process_message(FILE *fp, long msgstart, long msgend) {
1228         long hold_pos;
1229         long size;
1230         char *buffer;
1231
1232         hold_pos = ftell(fp);
1233         size = msgend - msgstart + 1;
1234         buffer = malloc(size);
1235         if (buffer != NULL) {
1236                 fseek(fp, msgstart, SEEK_SET);
1237                 fread(buffer, size, 1, fp);
1238                 network_process_buffer(buffer, size);
1239                 free(buffer);
1240         }
1241
1242         fseek(fp, hold_pos, SEEK_SET);
1243 }
1244
1245
1246 /*
1247  * Process a single file from the inbound queue
1248  */
1249 void network_process_file(char *filename) {
1250         FILE *fp;
1251         long msgstart = (-1L);
1252         long msgend = (-1L);
1253         long msgcur = 0L;
1254         int ch;
1255
1256
1257         fp = fopen(filename, "rb");
1258         if (fp == NULL) {
1259                 lprintf(CTDL_CRIT, "Error opening %s: %s\n",
1260                         filename, strerror(errno));
1261                 return;
1262         }
1263
1264         lprintf(CTDL_INFO, "network: processing <%s>\n", filename);
1265
1266         /* Look for messages in the data stream and break them out */
1267         while (ch = getc(fp), ch >= 0) {
1268
1269                 if (ch == 255) {
1270                         if (msgstart >= 0L) {
1271                                 msgend = msgcur - 1;
1272                                 network_process_message(fp, msgstart, msgend);
1273                         }
1274                         msgstart = msgcur;
1275                 }
1276
1277                 ++msgcur;
1278         }
1279
1280         msgend = msgcur - 1;
1281         if (msgstart >= 0L) {
1282                 network_process_message(fp, msgstart, msgend);
1283         }
1284
1285         fclose(fp);
1286         unlink(filename);
1287 }
1288
1289
1290 /*
1291  * Process anything in the inbound queue
1292  */
1293 void network_do_spoolin(void) {
1294         DIR *dp;
1295         struct dirent *d;
1296         char filename[SIZ];
1297
1298         dp = opendir("./network/spoolin");
1299         if (dp == NULL) return;
1300
1301         while (d = readdir(dp), d != NULL) {
1302                 snprintf(filename, sizeof filename,
1303                         "./network/spoolin/%s", d->d_name);
1304                 network_process_file(filename);
1305         }
1306
1307
1308         closedir(dp);
1309 }
1310
1311
1312 /*
1313  * Delete any files in the outbound queue that were intended
1314  * to be sent to nodes which no longer exist.
1315  */
1316 void network_purge_spoolout(void) {
1317         DIR *dp;
1318         struct dirent *d;
1319         char filename[SIZ];
1320         char nexthop[SIZ];
1321         int i;
1322
1323         dp = opendir("./network/spoolout");
1324         if (dp == NULL) return;
1325
1326         while (d = readdir(dp), d != NULL) {
1327                 snprintf(filename, sizeof filename,
1328                         "./network/spoolout/%s", d->d_name);
1329
1330                 strcpy(nexthop, "");
1331                 i = is_valid_node(nexthop, NULL, d->d_name);
1332
1333                 if ( (i != 0) || (strlen(nexthop) > 0) ) {
1334                         unlink(filename);
1335                 }
1336         }
1337
1338
1339         closedir(dp);
1340 }
1341
1342
1343
1344 /*
1345  * receive network spool from the remote system
1346  */
1347 void receive_spool(int sock, char *remote_nodename) {
1348         long download_len;
1349         long bytes_received;
1350         char buf[SIZ];
1351         static char pbuf[IGNET_PACKET_SIZE];
1352         char tempfilename[PATH_MAX];
1353         long plen;
1354         FILE *fp;
1355
1356         strcpy(tempfilename, tmpnam(NULL));
1357         if (sock_puts(sock, "NDOP") < 0) return;
1358         if (sock_gets(sock, buf) < 0) return;
1359         lprintf(CTDL_DEBUG, "<%s\n", buf);
1360         if (buf[0] != '2') {
1361                 return;
1362         }
1363         download_len = extract_long(&buf[4], 0);
1364
1365         bytes_received = 0L;
1366         fp = fopen(tempfilename, "w");
1367         if (fp == NULL) {
1368                 lprintf(CTDL_CRIT, "cannot open download file locally: %s\n",
1369                         strerror(errno));
1370                 return;
1371         }
1372
1373         while (bytes_received < download_len) {
1374                 snprintf(buf, sizeof buf, "READ %ld|%ld",
1375                         bytes_received,
1376                      ((download_len - bytes_received > IGNET_PACKET_SIZE)
1377                  ? IGNET_PACKET_SIZE : (download_len - bytes_received)));
1378                 if (sock_puts(sock, buf) < 0) {
1379                         fclose(fp);
1380                         unlink(tempfilename);
1381                         return;
1382                 }
1383                 if (sock_gets(sock, buf) < 0) {
1384                         fclose(fp);
1385                         unlink(tempfilename);
1386                         return;
1387                 }
1388                 if (buf[0] == '6') {
1389                         plen = extract_long(&buf[4], 0);
1390                         if (sock_read(sock, pbuf, plen) < 0) {
1391                                 fclose(fp);
1392                                 unlink(tempfilename);
1393                                 return;
1394                         }
1395                         fwrite((char *) pbuf, plen, 1, fp);
1396                         bytes_received = bytes_received + plen;
1397                 }
1398         }
1399
1400         fclose(fp);
1401         if (sock_puts(sock, "CLOS") < 0) {
1402                 unlink(tempfilename);
1403                 return;
1404         }
1405         if (sock_gets(sock, buf) < 0) {
1406                 unlink(tempfilename);
1407                 return;
1408         }
1409         lprintf(CTDL_DEBUG, "%s\n", buf);
1410         snprintf(buf, sizeof buf, "mv %s ./network/spoolin/%s.%ld",
1411                 tempfilename, remote_nodename, (long) getpid());
1412         system(buf);
1413 }
1414
1415
1416
1417 /*
1418  * transmit network spool to the remote system
1419  */
1420 void transmit_spool(int sock, char *remote_nodename)
1421 {
1422         char buf[SIZ];
1423         char pbuf[4096];
1424         long plen;
1425         long bytes_to_write, thisblock;
1426         int fd;
1427         char sfname[128];
1428
1429         if (sock_puts(sock, "NUOP") < 0) return;
1430         if (sock_gets(sock, buf) < 0) return;
1431         lprintf(CTDL_DEBUG, "<%s\n", buf);
1432         if (buf[0] != '2') {
1433                 return;
1434         }
1435
1436         snprintf(sfname, sizeof sfname, "./network/spoolout/%s", remote_nodename);
1437         fd = open(sfname, O_RDONLY);
1438         if (fd < 0) {
1439                 if (errno == ENOENT) {
1440                         lprintf(CTDL_INFO, "Nothing to send.\n");
1441                 } else {
1442                         lprintf(CTDL_CRIT, "cannot open upload file locally: %s\n",
1443                                 strerror(errno));
1444                 }
1445                 return;
1446         }
1447         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
1448                 bytes_to_write = plen;
1449                 while (bytes_to_write > 0L) {
1450                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
1451                         if (sock_puts(sock, buf) < 0) {
1452                                 close(fd);
1453                                 return;
1454                         }
1455                         if (sock_gets(sock, buf) < 0) {
1456                                 close(fd);
1457                                 return;
1458                         }
1459                         thisblock = atol(&buf[4]);
1460                         if (buf[0] == '7') {
1461                                 if (sock_write(sock, pbuf,
1462                                    (int) thisblock) < 0) {
1463                                         close(fd);
1464                                         return;
1465                                 }
1466                                 bytes_to_write = bytes_to_write - thisblock;
1467                         } else {
1468                                 goto ABORTUPL;
1469                         }
1470                 }
1471         }
1472
1473 ABORTUPL:
1474         close(fd);
1475         if (sock_puts(sock, "UCLS 1") < 0) return;
1476         if (sock_gets(sock, buf) < 0) return;
1477         lprintf(CTDL_DEBUG, "<%s\n", buf);
1478         if (buf[0] == '2') {
1479                 unlink(sfname);
1480         }
1481 }
1482
1483
1484
1485 /*
1486  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
1487  */
1488 void network_poll_node(char *node, char *secret, char *host, char *port) {
1489         int sock;
1490         char buf[SIZ];
1491
1492         if (network_talking_to(node, NTT_CHECK)) return;
1493         network_talking_to(node, NTT_ADD);
1494         lprintf(CTDL_INFO, "Polling node <%s> at %s:%s\n", node, host, port);
1495
1496         sock = sock_connect(host, port, "tcp");
1497         if (sock < 0) {
1498                 lprintf(CTDL_ERR, "Could not connect: %s\n", strerror(errno));
1499                 network_talking_to(node, NTT_REMOVE);
1500                 return;
1501         }
1502
1503         lprintf(CTDL_DEBUG, "Connected!\n");
1504
1505         /* Read the server greeting */
1506         if (sock_gets(sock, buf) < 0) goto bail;
1507         lprintf(CTDL_DEBUG, ">%s\n", buf);
1508
1509         /* Identify ourselves */
1510         snprintf(buf, sizeof buf, "NETP %s|%s", config.c_nodename, secret);
1511         lprintf(CTDL_DEBUG, "<%s\n", buf);
1512         if (sock_puts(sock, buf) <0) goto bail;
1513         if (sock_gets(sock, buf) < 0) goto bail;
1514         lprintf(CTDL_DEBUG, ">%s\n", buf);
1515         if (buf[0] != '2') goto bail;
1516
1517         /* At this point we are authenticated. */
1518         receive_spool(sock, node);
1519         transmit_spool(sock, node);
1520
1521         sock_puts(sock, "QUIT");
1522 bail:   sock_close(sock);
1523         network_talking_to(node, NTT_REMOVE);
1524 }
1525
1526
1527
1528 /*
1529  * Poll other Citadel nodes and transfer inbound/outbound network data.
1530  * Set "full" to nonzero to force a poll of every node, or to zero to poll
1531  * only nodes to which we have data to send.
1532  */
1533 void network_poll_other_citadel_nodes(int full_poll) {
1534         int i;
1535         char linebuf[SIZ];
1536         char node[SIZ];
1537         char host[SIZ];
1538         char port[SIZ];
1539         char secret[SIZ];
1540         int poll = 0;
1541         char spoolfile[SIZ];
1542
1543         if (working_ignetcfg == NULL) return;   /* no nodes defined */
1544
1545         /* Use the string tokenizer to grab one line at a time */
1546         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
1547                 extract_token(linebuf, working_ignetcfg, i, '\n');
1548                 extract(node, linebuf, 0);
1549                 extract(secret, linebuf, 1);
1550                 extract(host, linebuf, 2);
1551                 extract(port, linebuf, 3);
1552                 if ( (strlen(node) > 0) && (strlen(secret) > 0)
1553                    && (strlen(host) > 0) && strlen(port) > 0) {
1554                         poll = full_poll;
1555                         if (poll == 0) {
1556                                 sprintf(spoolfile, "./network/spoolout/%s",
1557                                         node);
1558                                 if (access(spoolfile, R_OK) == 0) {
1559                                         poll = 1;
1560                                 }
1561                         }
1562                         if (poll) {
1563                                 network_poll_node(node, secret, host, port);
1564                         }
1565                 }
1566         }
1567
1568 }
1569
1570
1571
1572
1573
1574
1575
1576 /*
1577  * network_do_queue()
1578  *
1579  * Run through the rooms doing various types of network stuff.
1580  */
1581 void network_do_queue(void) {
1582         static time_t last_run = 0L;
1583         struct RoomProcList *ptr;
1584         int full_processing = 1;
1585
1586         /*
1587          * Run the full set of processing tasks no more frequently
1588          * than once every n seconds
1589          */
1590         if ( (time(NULL) - last_run) < config.c_net_freq ) {
1591                 full_processing = 0;
1592         }
1593
1594         /*
1595          * This is a simple concurrency check to make sure only one queue run
1596          * is done at a time.  We could do this with a mutex, but since we
1597          * don't really require extremely fine granularity here, we'll do it
1598          * with a static variable instead.
1599          */
1600         if (doing_queue) return;
1601         doing_queue = 1;
1602
1603         /* Load the IGnet Configuration into memory */
1604         if (working_ignetcfg == NULL) {
1605                 working_ignetcfg = CtdlGetSysConfig(IGNETCFG);
1606         }
1607
1608         /*
1609          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
1610          * then we poll everyone.  Otherwise we only poll nodes we have stuff
1611          * to send to.
1612          */
1613         network_poll_other_citadel_nodes(full_processing);
1614
1615         /*
1616          * Load the network map and filter list into memory.
1617          */
1618         read_network_map();
1619         filterlist = load_filter_list();
1620
1621         /*
1622          * Go ahead and run the queue
1623          */
1624         if (full_processing) {
1625                 lprintf(CTDL_INFO, "network: loading outbound queue\n");
1626                 ForEachRoom(network_queue_room, NULL);
1627
1628                 lprintf(CTDL_INFO, "network: running outbound queue\n");
1629                 while (rplist != NULL) {
1630                         network_spoolout_room(rplist->name);
1631                         ptr = rplist;
1632                         rplist = rplist->next;
1633                         free(ptr);
1634                 }
1635         }
1636
1637         lprintf(CTDL_INFO, "network: processing inbound queue\n");
1638         network_do_spoolin();
1639
1640         /* Save the network map back to disk */
1641         write_network_map();
1642
1643         /* Free the filter list in memory */
1644         free_filter_list(filterlist);
1645         filterlist = NULL;
1646
1647         network_purge_spoolout();
1648
1649         lprintf(CTDL_INFO, "network: queue run completed\n");
1650
1651         if (full_processing) {
1652                 last_run = time(NULL);
1653         }
1654
1655         doing_queue = 0;
1656         free(working_ignetcfg);
1657 }
1658
1659
1660 /*
1661  * cmd_netp() - authenticate to the server as another Citadel node polling
1662  *              for network traffic
1663  */
1664 void cmd_netp(char *cmdbuf)
1665 {
1666         char node[SIZ];
1667         char pass[SIZ];
1668
1669         char secret[SIZ];
1670         char nexthop[SIZ];
1671
1672         if (doing_queue) {
1673                 cprintf("%d spooling - try again in a few minutes\n", ERROR + RESOURCE_BUSY);
1674                 return;
1675         }
1676
1677         extract(node, cmdbuf, 0);
1678         extract(pass, cmdbuf, 1);
1679
1680         if (is_valid_node(nexthop, secret, node) != 0) {
1681                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
1682                 return;
1683         }
1684
1685         if (strcasecmp(pass, secret)) {
1686                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
1687                 return;
1688         }
1689
1690         if (network_talking_to(node, NTT_CHECK)) {
1691                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
1692                 return;
1693         }
1694
1695         safestrncpy(CC->net_node, node, sizeof CC->net_node);
1696         network_talking_to(node, NTT_ADD);
1697         cprintf("%d authenticated as network node '%s'\n", CIT_OK,
1698                 CC->net_node);
1699 }
1700
1701
1702 /*
1703  * This handler detects changes being made to the system's IGnet
1704  * configuration.
1705  */
1706 int netconfig_aftersave(struct CtdlMessage *msg) {
1707         char *ptr;
1708         int linelen;
1709
1710         /* If this isn't the configuration room, or if this isn't a MIME
1711          * message, don't bother.
1712          */
1713         if (strcasecmp(msg->cm_fields['O'], SYSCONFIGROOM)) return(0);
1714         if (msg->cm_format_type != 4) return(0);
1715
1716         ptr = msg->cm_fields['M'];
1717         while (ptr != NULL) {
1718
1719                 linelen = strcspn(ptr, "\n");
1720                 if (linelen == 0) return(0);    /* end of headers */
1721
1722                 if (!strncasecmp(ptr, "Content-type: ", 14)) {
1723                         if (!strncasecmp(&ptr[14], IGNETCFG,
1724                            strlen(IGNETCFG))) {
1725                                 if (ignetcfg != NULL) free(ignetcfg);
1726                                 ignetcfg = NULL;
1727                         }
1728                 }
1729
1730                 ptr = strchr((char *)ptr, '\n');
1731                 if (ptr != NULL) ++ptr;
1732         }
1733
1734         return(0);
1735 }
1736
1737
1738
1739
1740 /*
1741  * Module entry point
1742  */
1743 char *serv_network_init(void)
1744 {
1745         CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
1746         CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
1747         CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
1748         CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
1749         CtdlRegisterSessionHook(network_do_queue, EVT_TIMER);
1750         CtdlRegisterMessageHook(netconfig_aftersave, EVT_AFTERSAVE);
1751         return "$Id$";
1752 }