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         char nodename[SIZ];
 690         char nexthop[SIZ];
 691         FILE *fp;
 692         struct SpoolControl sc;
 693         struct namelist *nptr = NULL;
 694         size_t miscsize = 0;
 695         size_t linesize = 0;
 696         int skipthisline = 0;
 697         int i;
 698
 699         if (getroom(&CC->room, room_to_spool) != 0) {
 700                 lprintf(CTDL_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
 701                 return;
 702         }
 703
 704         memset(&sc, 0, sizeof(struct SpoolControl));
 705         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 706
 707         begin_critical_section(S_NETCONFIGS);
 708
 709         fp = fopen(filename, "r");
 710         if (fp == NULL) {
 711                 end_critical_section(S_NETCONFIGS);
 712                 return;
 713         }
 714
 715         lprintf(CTDL_INFO, "Networking started for <%s>\n", CC->room.QRname);
 716
 717         while (fgets(buf, sizeof buf, fp) != NULL) {
 718                 buf[strlen(buf)-1] = 0;
 719
 720                 extract(instr, buf, 0);
 721                 if (!strcasecmp(instr, "lastsent")) {
 722                         sc.lastsent = extract_long(buf, 1);
 723                 }
 724                 else if (!strcasecmp(instr, "listrecp")) {
 725                         nptr = (struct namelist *)
 726                                 malloc(sizeof(struct namelist));
 727                         nptr->next = sc.listrecps;
 728                         extract(nptr->name, buf, 1);
 729                         sc.listrecps = nptr;
 730                 }
 731                 else if (!strcasecmp(instr, "digestrecp")) {
 732                         nptr = (struct namelist *)
 733                                 malloc(sizeof(struct namelist));
 734                         nptr->next = sc.digestrecps;
 735                         extract(nptr->name, buf, 1);
 736                         sc.digestrecps = nptr;
 737                 }
 738                 else if (!strcasecmp(instr, "ignet_push_share")) {
 739                         /* by checking each node's validity, we automatically
 740                          * purge nodes which do not exist from room network
 741                          * configurations at this time.
 742                          */
 743                         extract(nodename, buf, 1);
 744                         strcpy(nexthop, "xxx");
 745                         if (is_valid_node(nexthop, NULL, nodename) == 0) {
 746                                 if (strlen(nexthop) == 0) {
 747                                         nptr = (struct namelist *)
 748                                                 malloc(sizeof(struct namelist));
 749                                         nptr->next = sc.ignet_push_shares;
 750                                         strcpy(nptr->name, nodename);
 751                                         sc.ignet_push_shares = nptr;
 752                                 }
 753                         }
 754                 }
 755                 else {
 756                         /* Preserve 'other' lines ... *unless* they happen to
 757                          * be subscribe/unsubscribe pendings with expired
 758                          * timestamps.
 759                          */
 760                         skipthisline = 0;
 761                         if (!strncasecmp(buf, "subpending|", 11)) {
 762                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
 763                                         skipthisline = 1;
 764                                 }
 765                         }
 766                         if (!strncasecmp(buf, "unsubpending|", 13)) {
 767                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
 768                                         skipthisline = 1;
 769                                 }
 770                         }
 771
 772                         if (skipthisline == 0) {
 773                                 linesize = strlen(buf);
 774                                 sc.misc = realloc(sc.misc,
 775                                         (miscsize + linesize + 2) );
 776                                 sprintf(&sc.misc[miscsize], "%s\n", buf);
 777                                 miscsize = miscsize + linesize + 1;
 778                         }
 779                 }
 780
 781
 782         }
 783         fclose(fp);
 784
 785         /* If there are digest recipients, we have to build a digest */
 786         if (sc.digestrecps != NULL) {
 787                 sc.digestfp = tmpfile();
 788                 fprintf(sc.digestfp, "Content-type: text/plain\n\n");
 789         }
 790
 791         /* Do something useful */
 792         CtdlForEachMessage(MSGS_GT, sc.lastsent, NULL, NULL,
 793                 network_spool_msg, &sc);
 794
 795         /* If we wrote a digest, deliver it and then close it */
 796         snprintf(buf, sizeof buf, "room_%s@%s",
 797                 CC->room.QRname, config.c_fqdn);
 798         for (i=0; i<strlen(buf); ++i) {
 799                 buf[i] = tolower(buf[i]);
 800                 if (isspace(buf[i])) buf[i] = '_';
 801         }
 802         if (sc.digestfp != NULL) {
 803                 fprintf(sc.digestfp,    " -----------------------------------"
 804                                         "------------------------------------"
 805                                         "-------\n"
 806                                         "You are subscribed to the '%s' "
 807                                         "list.\n"
 808                                         "To post to the list: %s\n",
 809                                         CC->room.QRname, buf
 810                 );
 811                 network_deliver_digest(&sc);    /* deliver and close */
 812         }
 813
 814         /* Now rewrite the config file */
 815         fp = fopen(filename, "w");
 816         if (fp == NULL) {
 817                 lprintf(CTDL_CRIT, "ERROR: cannot open %s: %s\n",
 818                         filename, strerror(errno));
 819         }
 820         else {
 821                 fprintf(fp, "lastsent|%ld\n", sc.lastsent);
 822
 823                 /* Write out the listrecps while freeing from memory at the
 824                  * same time.  Am I clever or what?  :)
 825                  */
 826                 while (sc.listrecps != NULL) {
 827                         fprintf(fp, "listrecp|%s\n", sc.listrecps->name);
 828                         nptr = sc.listrecps->next;
 829                         free(sc.listrecps);
 830                         sc.listrecps = nptr;
 831                 }
 832                 /* Do the same for digestrecps */
 833                 while (sc.digestrecps != NULL) {
 834                         fprintf(fp, "digestrecp|%s\n", sc.digestrecps->name);
 835                         nptr = sc.digestrecps->next;
 836                         free(sc.digestrecps);
 837                         sc.digestrecps = nptr;
 838                 }
 839                 while (sc.ignet_push_shares != NULL) {
 840                         /* by checking each node's validity, we automatically
 841                          * purge nodes which do not exist from room network
 842                          * configurations at this time.
 843                          */
 844                         if (is_valid_node(NULL, NULL, sc.ignet_push_shares->name) == 0) {
 845                         }
 846                         fprintf(fp, "ignet_push_share|%s\n",
 847                                 sc.ignet_push_shares->name);
 848                         nptr = sc.ignet_push_shares->next;
 849                         free(sc.ignet_push_shares);
 850                         sc.ignet_push_shares = nptr;
 851                 }
 852                 if (sc.misc != NULL) {
 853                         fwrite(sc.misc, strlen(sc.misc), 1, fp);
 854                 }
 855                 free(sc.misc);
 856
 857                 fclose(fp);
 858         }
 859         end_critical_section(S_NETCONFIGS);
 860 }
 861
 862
 863
 864 /*
 865  * Send the *entire* contents of the current room to one specific network node,
 866  * ignoring anything we know about which messages have already undergone
 867  * network processing.  This can be used to bring a new node into sync.
 868  */
 869 int network_sync_to(char *target_node) {
 870         struct SpoolControl sc;
 871         int num_spooled = 0;
 872
 873         /* Concise syntax because we don't need a full linked-list */
 874         memset(&sc, 0, sizeof(struct SpoolControl));
 875         sc.ignet_push_shares = (struct namelist *)
 876                 malloc(sizeof(struct namelist));
 877         sc.ignet_push_shares->next = NULL;
 878         safestrncpy(sc.ignet_push_shares->name,
 879                 target_node,
 880                 sizeof sc.ignet_push_shares->name);
 881
 882         /* Send ALL messages */
 883         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL,
 884                 network_spool_msg, &sc);
 885
 886         /* Concise cleanup because we know there's only one node in the sc */
 887         free(sc.ignet_push_shares);
 888
 889         lprintf(CTDL_INFO, "Synchronized %d messages to <%s>\n",
 890                 num_spooled, target_node);
 891         return(num_spooled);
 892 }
 893
 894
 895 /*
 896  * Implements the NSYN command
 897  */
 898 void cmd_nsyn(char *argbuf) {
 899         int num_spooled;
 900         char target_node[SIZ];
 901
 902         if (CtdlAccessCheck(ac_aide)) return;
 903
 904         extract(target_node, argbuf, 0);
 905         num_spooled = network_sync_to(target_node);
 906         cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
 907 }
 908
 909
 910
 911 /*
 912  * Batch up and send all outbound traffic from the current room
 913  */
 914 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
 915         struct RoomProcList *ptr;
 916
 917         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
 918         if (ptr == NULL) return;
 919
 920         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
 921         ptr->next = rplist;
 922         rplist = ptr;
 923 }
 924
 925
 926 /*
 927  * Learn topology from path fields
 928  */
 929 void network_learn_topology(char *node, char *path) {
 930         char nexthop[SIZ];
 931         struct NetMap *nmptr;
 932
 933         strcpy(nexthop, "");
 934
 935         if (num_tokens(path, '!') < 3) return;
 936         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 937                 if (!strcasecmp(nmptr->nodename, node)) {
 938                         extract_token(nmptr->nexthop, path, 0, '!');
 939                         nmptr->lastcontact = time(NULL);
 940                         return;
 941                 }
 942         }
 943
 944         /* If we got here then it's not in the map, so add it. */
 945         nmptr = (struct NetMap *) malloc(sizeof (struct NetMap));
 946         strcpy(nmptr->nodename, node);
 947         nmptr->lastcontact = time(NULL);
 948         extract_token(nmptr->nexthop, path, 0, '!');
 949         nmptr->next = the_netmap;
 950         the_netmap = nmptr;
 951 }
 952
 953
 954
 955
 956 /*
 957  * Bounce a message back to the sender
 958  */
 959 void network_bounce(struct CtdlMessage *msg, char *reason) {
 960         char *oldpath = NULL;
 961         char buf[SIZ];
 962         char bouncesource[SIZ];
 963         char recipient[SIZ];
 964         struct recptypes *valid = NULL;
 965         char force_room[ROOMNAMELEN];
 966         static int serialnum = 0;
 967         size_t size;
 968
 969         lprintf(CTDL_DEBUG, "entering network_bounce()\n");
 970
 971         if (msg == NULL) return;
 972
 973         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
 974
 975         /*
 976          * Give it a fresh message ID
 977          */
 978         if (msg->cm_fields['I'] != NULL) {
 979                 free(msg->cm_fields['I']);
 980         }
 981         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
 982                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
 983         msg->cm_fields['I'] = strdup(buf);
 984
 985         /*
 986          * FIXME ... right now we're just sending a bounce; we really want to
 987          * include the text of the bounced message.
 988          */
 989         if (msg->cm_fields['M'] != NULL) {
 990                 free(msg->cm_fields['M']);
 991         }
 992         msg->cm_fields['M'] = strdup(reason);
 993         msg->cm_format_type = 0;
 994
 995         /*
 996          * Turn the message around
 997          */
 998         if (msg->cm_fields['R'] == NULL) {
 999                 free(msg->cm_fields['R']);
1000         }
1001
1002         if (msg->cm_fields['D'] == NULL) {
1003                 free(msg->cm_fields['D']);
1004         }
1005
1006         snprintf(recipient, sizeof recipient, "%s@%s",
1007                 msg->cm_fields['A'], msg->cm_fields['N']);
1008
1009         if (msg->cm_fields['A'] == NULL) {
1010                 free(msg->cm_fields['A']);
1011         }
1012
1013         if (msg->cm_fields['N'] == NULL) {
1014                 free(msg->cm_fields['N']);
1015         }
1016
1017         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1018         msg->cm_fields['N'] = strdup(config.c_nodename);
1019
1020
1021         /* prepend our node to the path */
1022         if (msg->cm_fields['P'] != NULL) {
1023                 oldpath = msg->cm_fields['P'];
1024                 msg->cm_fields['P'] = NULL;
1025         }
1026         else {
1027                 oldpath = strdup("unknown_user");
1028         }
1029         size = strlen(oldpath) + SIZ;
1030         msg->cm_fields['P'] = malloc(size);
1031         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1032         free(oldpath);
1033
1034         /* Now submit the message */
1035         valid = validate_recipients(recipient);
1036         if (valid != NULL) if (valid->num_error > 0) {
1037                 free(valid);
1038                 valid = NULL;
1039         }
1040         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1041                 strcpy(force_room, config.c_aideroom);
1042         }
1043         else {
1044                 strcpy(force_room, "");
1045         }
1046         if ( (valid == NULL) && (strlen(force_room) == 0) ) {
1047                 strcpy(force_room, config.c_aideroom);
1048         }
1049         CtdlSubmitMsg(msg, valid, force_room);
1050
1051         /* Clean up */
1052         if (valid != NULL) free(valid);
1053         CtdlFreeMessage(msg);
1054         lprintf(CTDL_DEBUG, "leaving network_bounce()\n");
1055 }
1056
1057
1058
1059
1060 /*
1061  * Process a buffer containing a single message from a single file
1062  * from the inbound queue
1063  */
1064 void network_process_buffer(char *buffer, long size) {
1065         struct CtdlMessage *msg;
1066         long pos;
1067         int field;
1068         struct recptypes *recp = NULL;
1069         char target_room[ROOMNAMELEN];
1070         struct ser_ret sermsg;
1071         char *oldpath = NULL;
1072         char filename[SIZ];
1073         FILE *fp;
1074         char nexthop[SIZ];
1075         unsigned char firstbyte;
1076         unsigned char lastbyte;
1077
1078         /* Validate just a little bit.  First byte should be FF and
1079          * last byte should be 00.
1080          */
1081         memcpy(&firstbyte, &buffer[0], 1);
1082         memcpy(&lastbyte, &buffer[size-1], 1);
1083         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1084                 lprintf(CTDL_ERR, "Corrupt message!  Ignoring.\n");
1085                 return;
1086         }
1087
1088         /* Set default target room to trash */
1089         strcpy(target_room, TWITROOM);
1090
1091         /* Load the message into memory */
1092         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1093         memset(msg, 0, sizeof(struct CtdlMessage));
1094         msg->cm_magic = CTDLMESSAGE_MAGIC;
1095         msg->cm_anon_type = buffer[1];
1096         msg->cm_format_type = buffer[2];
1097
1098         for (pos = 3; pos < size; ++pos) {
1099                 field = buffer[pos];
1100                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1101                 pos = pos + strlen(&buffer[(int)pos]);
1102         }
1103
1104         /* Check for message routing */
1105         if (msg->cm_fields['D'] != NULL) {
1106                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1107
1108                         /* route the message */
1109                         strcpy(nexthop, "");
1110                         if (is_valid_node(nexthop, NULL,
1111                            msg->cm_fields['D']) == 0) {
1112
1113                                 /* prepend our node to the path */
1114                                 if (msg->cm_fields['P'] != NULL) {
1115                                         oldpath = msg->cm_fields['P'];
1116                                         msg->cm_fields['P'] = NULL;
1117                                 }
1118                                 else {
1119                                         oldpath = strdup("unknown_user");
1120                                 }
1121                                 size = strlen(oldpath) + SIZ;
1122                                 msg->cm_fields['P'] = malloc(size);
1123                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1124                                         config.c_nodename, oldpath);
1125                                 free(oldpath);
1126
1127                                 /* serialize the message */
1128                                 serialize_message(&sermsg, msg);
1129
1130                                 /* now send it */
1131                                 if (strlen(nexthop) == 0) {
1132                                         strcpy(nexthop, msg->cm_fields['D']);
1133                                 }
1134                                 snprintf(filename, sizeof filename,
1135                                         "./network/spoolout/%s", nexthop);
1136                                 fp = fopen(filename, "ab");
1137                                 if (fp != NULL) {
1138                                         fwrite(sermsg.ser,
1139                                                 sermsg.len, 1, fp);
1140                                         fclose(fp);
1141                                 }
1142                                 free(sermsg.ser);
1143                                 CtdlFreeMessage(msg);
1144                                 return;
1145                         }
1146
1147                         else {  /* invalid destination node name */
1148
1149                                 network_bounce(msg,
1150 "A message you sent could not be delivered due to an invalid destination node"
1151 " name.  Please check the address and try sending the message again.\n");
1152                                 msg = NULL;
1153                                 return;
1154
1155                         }
1156                 }
1157         }
1158
1159         /*
1160          * Check to see if we already have a copy of this message, and
1161          * abort its processing if so.  (We used to post a warning to Aide>
1162          * every time this happened, but the network is now so densely
1163          * connected that it's inevitable.)
1164          */
1165         if (network_usetable(msg) != 0) {
1166                 return;
1167         }
1168
1169         /* Learn network topology from the path */
1170         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1171                 network_learn_topology(msg->cm_fields['N'],
1172                                         msg->cm_fields['P']);
1173         }
1174
1175         /* Is the sending node giving us a very persuasive suggestion about
1176          * which room this message should be saved in?  If so, go with that.
1177          */
1178         if (msg->cm_fields['C'] != NULL) {
1179                 safestrncpy(target_room,
1180                         msg->cm_fields['C'],
1181                         sizeof target_room);
1182         }
1183
1184         /* Otherwise, does it have a recipient?  If so, validate it... */
1185         else if (msg->cm_fields['R'] != NULL) {
1186                 recp = validate_recipients(msg->cm_fields['R']);
1187                 if (recp != NULL) if (recp->num_error > 0) {
1188                         network_bounce(msg,
1189 "A message you sent could not be delivered due to an invalid address.\n"
1190 "Please check the address and try sending the message again.\n");
1191                         msg = NULL;
1192                         free(recp);
1193                         return;
1194                 }
1195                 strcpy(target_room, "");        /* no target room if mail */
1196         }
1197
1198         /* Our last shot at finding a home for this message is to see if
1199          * it has the O field (Originating room) set.
1200          */
1201         else if (msg->cm_fields['O'] != NULL) {
1202                 safestrncpy(target_room,
1203                         msg->cm_fields['O'],
1204                         sizeof target_room);
1205         }
1206
1207         /* Strip out fields that are only relevant during transit */
1208         if (msg->cm_fields['D'] != NULL) {
1209                 free(msg->cm_fields['D']);
1210                 msg->cm_fields['D'] = NULL;
1211         }
1212         if (msg->cm_fields['C'] != NULL) {
1213                 free(msg->cm_fields['C']);
1214                 msg->cm_fields['C'] = NULL;
1215         }
1216
1217         /* save the message into a room */
1218         if (PerformNetprocHooks(msg, target_room) == 0) {
1219                 msg->cm_flags = CM_SKIP_HOOKS;
1220                 CtdlSubmitMsg(msg, recp, target_room);
1221         }
1222         CtdlFreeMessage(msg);
1223         free(recp);
1224 }
1225
1226
1227 /*
1228  * Process a single message from a single file from the inbound queue
1229  */
1230 void network_process_message(FILE *fp, long msgstart, long msgend) {
1231         long hold_pos;
1232         long size;
1233         char *buffer;
1234
1235         hold_pos = ftell(fp);
1236         size = msgend - msgstart + 1;
1237         buffer = malloc(size);
1238         if (buffer != NULL) {
1239                 fseek(fp, msgstart, SEEK_SET);
1240                 fread(buffer, size, 1, fp);
1241                 network_process_buffer(buffer, size);
1242                 free(buffer);
1243         }
1244
1245         fseek(fp, hold_pos, SEEK_SET);
1246 }
1247
1248
1249 /*
1250  * Process a single file from the inbound queue
1251  */
1252 void network_process_file(char *filename) {
1253         FILE *fp;
1254         long msgstart = (-1L);
1255         long msgend = (-1L);
1256         long msgcur = 0L;
1257         int ch;
1258
1259
1260         fp = fopen(filename, "rb");
1261         if (fp == NULL) {
1262                 lprintf(CTDL_CRIT, "Error opening %s: %s\n",
1263                         filename, strerror(errno));
1264                 return;
1265         }
1266
1267         lprintf(CTDL_INFO, "network: processing <%s>\n", filename);
1268
1269         /* Look for messages in the data stream and break them out */
1270         while (ch = getc(fp), ch >= 0) {
1271
1272                 if (ch == 255) {
1273                         if (msgstart >= 0L) {
1274                                 msgend = msgcur - 1;
1275                                 network_process_message(fp, msgstart, msgend);
1276                         }
1277                         msgstart = msgcur;
1278                 }
1279
1280                 ++msgcur;
1281         }
1282
1283         msgend = msgcur - 1;
1284         if (msgstart >= 0L) {
1285                 network_process_message(fp, msgstart, msgend);
1286         }
1287
1288         fclose(fp);
1289         unlink(filename);
1290 }
1291
1292
1293 /*
1294  * Process anything in the inbound queue
1295  */
1296 void network_do_spoolin(void) {
1297         DIR *dp;
1298         struct dirent *d;
1299         char filename[SIZ];
1300
1301         dp = opendir("./network/spoolin");
1302         if (dp == NULL) return;
1303
1304         while (d = readdir(dp), d != NULL) {
1305                 snprintf(filename, sizeof filename,
1306                         "./network/spoolin/%s", d->d_name);
1307                 network_process_file(filename);
1308         }
1309
1310
1311         closedir(dp);
1312 }
1313
1314
1315 /*
1316  * Delete any files in the outbound queue that were intended
1317  * to be sent to nodes which no longer exist.
1318  */
1319 void network_purge_spoolout(void) {
1320         DIR *dp;
1321         struct dirent *d;
1322         char filename[SIZ];
1323         char nexthop[SIZ];
1324         int i;
1325
1326         dp = opendir("./network/spoolout");
1327         if (dp == NULL) return;
1328
1329         while (d = readdir(dp), d != NULL) {
1330                 snprintf(filename, sizeof filename,
1331                         "./network/spoolout/%s", d->d_name);
1332
1333                 strcpy(nexthop, "");
1334                 i = is_valid_node(nexthop, NULL, d->d_name);
1335
1336                 if ( (i != 0) || (strlen(nexthop) > 0) ) {
1337                         unlink(filename);
1338                 }
1339         }
1340
1341
1342         closedir(dp);
1343 }
1344
1345
1346
1347 /*
1348  * receive network spool from the remote system
1349  */
1350 void receive_spool(int sock, char *remote_nodename) {
1351         long download_len;
1352         long bytes_received;
1353         char buf[SIZ];
1354         static char pbuf[IGNET_PACKET_SIZE];
1355         char tempfilename[PATH_MAX];
1356         long plen;
1357         FILE *fp;
1358
1359         strcpy(tempfilename, tmpnam(NULL));
1360         if (sock_puts(sock, "NDOP") < 0) return;
1361         if (sock_gets(sock, buf) < 0) return;
1362         lprintf(CTDL_DEBUG, "<%s\n", buf);
1363         if (buf[0] != '2') {
1364                 return;
1365         }
1366         download_len = extract_long(&buf[4], 0);
1367
1368         bytes_received = 0L;
1369         fp = fopen(tempfilename, "w");
1370         if (fp == NULL) {
1371                 lprintf(CTDL_CRIT, "cannot open download file locally: %s\n",
1372                         strerror(errno));
1373                 return;
1374         }
1375
1376         while (bytes_received < download_len) {
1377                 snprintf(buf, sizeof buf, "READ %ld|%ld",
1378                         bytes_received,
1379                      ((download_len - bytes_received > IGNET_PACKET_SIZE)
1380                  ? IGNET_PACKET_SIZE : (download_len - bytes_received)));
1381                 if (sock_puts(sock, buf) < 0) {
1382                         fclose(fp);
1383                         unlink(tempfilename);
1384                         return;
1385                 }
1386                 if (sock_gets(sock, buf) < 0) {
1387                         fclose(fp);
1388                         unlink(tempfilename);
1389                         return;
1390                 }
1391                 if (buf[0] == '6') {
1392                         plen = extract_long(&buf[4], 0);
1393                         if (sock_read(sock, pbuf, plen) < 0) {
1394                                 fclose(fp);
1395                                 unlink(tempfilename);
1396                                 return;
1397                         }
1398                         fwrite((char *) pbuf, plen, 1, fp);
1399                         bytes_received = bytes_received + plen;
1400                 }
1401         }
1402
1403         fclose(fp);
1404         if (sock_puts(sock, "CLOS") < 0) {
1405                 unlink(tempfilename);
1406                 return;
1407         }
1408         if (sock_gets(sock, buf) < 0) {
1409                 unlink(tempfilename);
1410                 return;
1411         }
1412         lprintf(CTDL_DEBUG, "%s\n", buf);
1413         snprintf(buf, sizeof buf, "mv %s ./network/spoolin/%s.%ld",
1414                 tempfilename, remote_nodename, (long) getpid());
1415         system(buf);
1416 }
1417
1418
1419
1420 /*
1421  * transmit network spool to the remote system
1422  */
1423 void transmit_spool(int sock, char *remote_nodename)
1424 {
1425         char buf[SIZ];
1426         char pbuf[4096];
1427         long plen;
1428         long bytes_to_write, thisblock;
1429         int fd;
1430         char sfname[128];
1431
1432         if (sock_puts(sock, "NUOP") < 0) return;
1433         if (sock_gets(sock, buf) < 0) return;
1434         lprintf(CTDL_DEBUG, "<%s\n", buf);
1435         if (buf[0] != '2') {
1436                 return;
1437         }
1438
1439         snprintf(sfname, sizeof sfname, "./network/spoolout/%s", remote_nodename);
1440         fd = open(sfname, O_RDONLY);
1441         if (fd < 0) {
1442                 if (errno == ENOENT) {
1443                         lprintf(CTDL_INFO, "Nothing to send.\n");
1444                 } else {
1445                         lprintf(CTDL_CRIT, "cannot open upload file locally: %s\n",
1446                                 strerror(errno));
1447                 }
1448                 return;
1449         }
1450         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
1451                 bytes_to_write = plen;
1452                 while (bytes_to_write > 0L) {
1453                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
1454                         if (sock_puts(sock, buf) < 0) {
1455                                 close(fd);
1456                                 return;
1457                         }
1458                         if (sock_gets(sock, buf) < 0) {
1459                                 close(fd);
1460                                 return;
1461                         }
1462                         thisblock = atol(&buf[4]);
1463                         if (buf[0] == '7') {
1464                                 if (sock_write(sock, pbuf,
1465                                    (int) thisblock) < 0) {
1466                                         close(fd);
1467                                         return;
1468                                 }
1469                                 bytes_to_write = bytes_to_write - thisblock;
1470                         } else {
1471                                 goto ABORTUPL;
1472                         }
1473                 }
1474         }
1475
1476 ABORTUPL:
1477         close(fd);
1478         if (sock_puts(sock, "UCLS 1") < 0) return;
1479         if (sock_gets(sock, buf) < 0) return;
1480         lprintf(CTDL_DEBUG, "<%s\n", buf);
1481         if (buf[0] == '2') {
1482                 unlink(sfname);
1483         }
1484 }
1485
1486
1487
1488 /*
1489  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
1490  */
1491 void network_poll_node(char *node, char *secret, char *host, char *port) {
1492         int sock;
1493         char buf[SIZ];
1494
1495         if (network_talking_to(node, NTT_CHECK)) return;
1496         network_talking_to(node, NTT_ADD);
1497         lprintf(CTDL_INFO, "Polling node <%s> at %s:%s\n", node, host, port);
1498
1499         sock = sock_connect(host, port, "tcp");
1500         if (sock < 0) {
1501                 lprintf(CTDL_ERR, "Could not connect: %s\n", strerror(errno));
1502                 network_talking_to(node, NTT_REMOVE);
1503                 return;
1504         }
1505
1506         lprintf(CTDL_DEBUG, "Connected!\n");
1507
1508         /* Read the server greeting */
1509         if (sock_gets(sock, buf) < 0) goto bail;
1510         lprintf(CTDL_DEBUG, ">%s\n", buf);
1511
1512         /* Identify ourselves */
1513         snprintf(buf, sizeof buf, "NETP %s|%s", config.c_nodename, secret);
1514         lprintf(CTDL_DEBUG, "<%s\n", buf);
1515         if (sock_puts(sock, buf) <0) goto bail;
1516         if (sock_gets(sock, buf) < 0) goto bail;
1517         lprintf(CTDL_DEBUG, ">%s\n", buf);
1518         if (buf[0] != '2') goto bail;
1519
1520         /* At this point we are authenticated. */
1521         receive_spool(sock, node);
1522         transmit_spool(sock, node);
1523
1524         sock_puts(sock, "QUIT");
1525 bail:   sock_close(sock);
1526         network_talking_to(node, NTT_REMOVE);
1527 }
1528
1529
1530
1531 /*
1532  * Poll other Citadel nodes and transfer inbound/outbound network data.
1533  * Set "full" to nonzero to force a poll of every node, or to zero to poll
1534  * only nodes to which we have data to send.
1535  */
1536 void network_poll_other_citadel_nodes(int full_poll) {
1537         int i;
1538         char linebuf[SIZ];
1539         char node[SIZ];
1540         char host[SIZ];
1541         char port[SIZ];
1542         char secret[SIZ];
1543         int poll = 0;
1544         char spoolfile[SIZ];
1545
1546         if (working_ignetcfg == NULL) return;   /* no nodes defined */
1547
1548         /* Use the string tokenizer to grab one line at a time */
1549         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
1550                 extract_token(linebuf, working_ignetcfg, i, '\n');
1551                 extract(node, linebuf, 0);
1552                 extract(secret, linebuf, 1);
1553                 extract(host, linebuf, 2);
1554                 extract(port, linebuf, 3);
1555                 if ( (strlen(node) > 0) && (strlen(secret) > 0)
1556                    && (strlen(host) > 0) && strlen(port) > 0) {
1557                         poll = full_poll;
1558                         if (poll == 0) {
1559                                 sprintf(spoolfile, "./network/spoolout/%s",
1560                                         node);
1561                                 if (access(spoolfile, R_OK) == 0) {
1562                                         poll = 1;
1563                                 }
1564                         }
1565                         if (poll) {
1566                                 network_poll_node(node, secret, host, port);
1567                         }
1568                 }
1569         }
1570
1571 }
1572
1573
1574
1575
1576
1577
1578
1579 /*
1580  * network_do_queue()
1581  *
1582  * Run through the rooms doing various types of network stuff.
1583  */
1584 void network_do_queue(void) {
1585         static time_t last_run = 0L;
1586         struct RoomProcList *ptr;
1587         int full_processing = 1;
1588
1589         /*
1590          * Run the full set of processing tasks no more frequently
1591          * than once every n seconds
1592          */
1593         if ( (time(NULL) - last_run) < config.c_net_freq ) {
1594                 full_processing = 0;
1595         }
1596
1597         /*
1598          * This is a simple concurrency check to make sure only one queue run
1599          * is done at a time.  We could do this with a mutex, but since we
1600          * don't really require extremely fine granularity here, we'll do it
1601          * with a static variable instead.
1602          */
1603         if (doing_queue) return;
1604         doing_queue = 1;
1605
1606         /* Load the IGnet Configuration into memory */
1607         working_ignetcfg = CtdlGetSysConfig(IGNETCFG);
1608
1609         /*
1610          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
1611          * then we poll everyone.  Otherwise we only poll nodes we have stuff
1612          * to send to.
1613          */
1614         network_poll_other_citadel_nodes(full_processing);
1615
1616         /*
1617          * Load the network map and filter list into memory.
1618          */
1619         read_network_map();
1620         filterlist = load_filter_list();
1621
1622         /*
1623          * Go ahead and run the queue
1624          */
1625         if (full_processing) {
1626                 lprintf(CTDL_INFO, "network: loading outbound queue\n");
1627                 ForEachRoom(network_queue_room, NULL);
1628
1629                 lprintf(CTDL_INFO, "network: running outbound queue\n");
1630                 while (rplist != NULL) {
1631                         network_spoolout_room(rplist->name);
1632                         ptr = rplist;
1633                         rplist = rplist->next;
1634                         free(ptr);
1635                 }
1636         }
1637
1638         lprintf(CTDL_INFO, "network: processing inbound queue\n");
1639         network_do_spoolin();
1640
1641         /* Save the network map back to disk */
1642         write_network_map();
1643
1644         /* Free the filter list in memory */
1645         free_filter_list(filterlist);
1646         filterlist = NULL;
1647
1648         network_purge_spoolout();
1649
1650         lprintf(CTDL_INFO, "network: queue run completed\n");
1651
1652         if (full_processing) {
1653                 last_run = time(NULL);
1654         }
1655
1656         doing_queue = 0;
1657         free(working_ignetcfg);
1658 }
1659
1660
1661 /*
1662  * cmd_netp() - authenticate to the server as another Citadel node polling
1663  *              for network traffic
1664  */
1665 void cmd_netp(char *cmdbuf)
1666 {
1667         char node[SIZ];
1668         char pass[SIZ];
1669
1670         char secret[SIZ];
1671         char nexthop[SIZ];
1672
1673         if (doing_queue) {
1674                 cprintf("%d spooling - try again in a few minutes\n", ERROR + RESOURCE_BUSY);
1675                 return;
1676         }
1677
1678         extract(node, cmdbuf, 0);
1679         extract(pass, cmdbuf, 1);
1680
1681         if (is_valid_node(nexthop, secret, node) != 0) {
1682                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
1683                 return;
1684         }
1685
1686         if (strcasecmp(pass, secret)) {
1687                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
1688                 return;
1689         }
1690
1691         if (network_talking_to(node, NTT_CHECK)) {
1692                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
1693                 return;
1694         }
1695
1696         safestrncpy(CC->net_node, node, sizeof CC->net_node);
1697         network_talking_to(node, NTT_ADD);
1698         cprintf("%d authenticated as network node '%s'\n", CIT_OK,
1699                 CC->net_node);
1700 }
1701
1702
1703 /*
1704  * This handler detects changes being made to the system's IGnet
1705  * configuration.
1706  */
1707 int netconfig_aftersave(struct CtdlMessage *msg) {
1708         char *ptr;
1709         int linelen;
1710
1711         /* If this isn't the configuration room, or if this isn't a MIME
1712          * message, don't bother.
1713          */
1714         if (strcasecmp(msg->cm_fields['O'], SYSCONFIGROOM)) return(0);
1715         if (msg->cm_format_type != 4) return(0);
1716
1717         ptr = msg->cm_fields['M'];
1718         while (ptr != NULL) {
1719
1720                 linelen = strcspn(ptr, "\n");
1721                 if (linelen == 0) return(0);    /* end of headers */
1722
1723                 if (!strncasecmp(ptr, "Content-type: ", 14)) {
1724                         if (!strncasecmp(&ptr[14], IGNETCFG,
1725                            strlen(IGNETCFG))) {
1726                                 if (ignetcfg != NULL) free(ignetcfg);
1727                                 ignetcfg = NULL;
1728                         }
1729                 }
1730
1731                 ptr = strchr((char *)ptr, '\n');
1732                 if (ptr != NULL) ++ptr;
1733         }
1734
1735         return(0);
1736 }
1737
1738
1739
1740
1741 /*
1742  * Module entry point
1743  */
1744 char *serv_network_init(void)
1745 {
1746         CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
1747         CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
1748         CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
1749         CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
1750         CtdlRegisterSessionHook(network_do_queue, EVT_TIMER);
1751         CtdlRegisterMessageHook(netconfig_aftersave, EVT_AFTERSAVE);
1752         return "$Id$";
1753 }