citadel/serv_network.c

   1 /*
   2  * $Id$
   3  *
   4  * This module handles shared rooms, inter-Citadel mail, and outbound
   5  * mailing list processing.
   6  *
   7  * Copyright (C) 2000-2002 by Art Cancro and others.
   8  * This code is released under the terms of the GNU General Public License.
   9  *
  10  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  11  * This is a fairly high-level type of critical section.  It ensures that no
  12  * two threads work on the netconfigs files at the same time.  Since we do
  13  * so many things inside these, here are the rules:
  14  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  15  *  2. Do *not* perform any I/O with the client during these sections.
  16  *
  17  */
  18
  19 /*
  20  * Duration of time (in seconds) after which pending list subscribe/unsubscribe
  21  * requests that have not been confirmed will be deleted.
  22  */
  23 #define EXP     259200  /* three days */
  24
  25 #include "sysdep.h"
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <stdio.h>
  29 #include <fcntl.h>
  30 #include <ctype.h>
  31 #include <signal.h>
  32 #include <pwd.h>
  33 #include <errno.h>
  34 #include <sys/types.h>
  35 #include <dirent.h>
  36 #if TIME_WITH_SYS_TIME
  37 # include <sys/time.h>
  38 # include <time.h>
  39 #else
  40 # if HAVE_SYS_TIME_H
  41 #  include <sys/time.h>
  42 # else
  43 #  include <time.h>
  44 # endif
  45 #endif
  46
  47 #include <sys/wait.h>
  48 #include <string.h>
  49 #include <limits.h>
  50 #include "citadel.h"
  51 #include "server.h"
  52 #include "sysdep_decls.h"
  53 #include "citserver.h"
  54 #include "support.h"
  55 #include "config.h"
  56 #include "serv_extensions.h"
  57 #include "room_ops.h"
  58 #include "user_ops.h"
  59 #include "policy.h"
  60 #include "database.h"
  61 #include "msgbase.h"
  62 #include "tools.h"
  63 #include "internet_addressing.h"
  64 #include "serv_network.h"
  65 #include "clientsocket.h"
  66 #include "file_ops.h"
  67
  68 #ifndef HAVE_SNPRINTF
  69 #include "snprintf.h"
  70 #endif
  71
  72 /* Nonzero while we are doing outbound network processing */
  73 static int doing_queue = 0;
  74
  75 /*
  76  * When we do network processing, it's accomplished in two passes; one to
  77  * gather a list of rooms and one to actually do them.  It's ok that rplist
  78  * is global; this process *only* runs as part of the housekeeping loop and
  79  * therefore only one will run at a time.
  80  */
  81 struct RoomProcList *rplist = NULL;
  82
  83 /*
  84  * We build a map of network nodes during processing.
  85  */
  86 struct NetMap *the_netmap = NULL;
  87 char *working_ignetcfg = NULL;
  88
  89 /*
  90  * Load or refresh the Citadel network (IGnet) configuration for this node.
  91  */
  92 void load_working_ignetcfg(void) {
  93         char *cfg;
  94
  95         cfg = CtdlGetSysConfig(IGNETCFG);
  96         if (cfg == NULL) {
  97                 cfg = strdup("");
  98         }
  99
 100         working_ignetcfg = realloc(working_ignetcfg, strlen(cfg) + 1 );
 101         strcpy(working_ignetcfg, cfg);
 102 }
 103
 104
 105
 106
 107
 108 /*
 109  * Keep track of what messages to reject
 110  */
 111 struct FilterList *load_filter_list(void) {
 112         char *serialized_list = NULL;
 113         int i;
 114         char buf[SIZ];
 115         struct FilterList *newlist = NULL;
 116         struct FilterList *nptr;
 117
 118         serialized_list = CtdlGetSysConfig(FILTERLIST);
 119         if (serialized_list == NULL) return(NULL); /* if null, no entries */
 120
 121         /* Use the string tokenizer to grab one line at a time */
 122         for (i=0; i<num_tokens(serialized_list, '\n'); ++i) {
 123                 extract_token(buf, serialized_list, i, '\n');
 124                 nptr = (struct FilterList *) malloc(sizeof(struct FilterList));
 125                 extract(nptr->fl_user, buf, 0);
 126                 striplt(nptr->fl_user);
 127                 extract(nptr->fl_room, buf, 1);
 128                 striplt(nptr->fl_room);
 129                 extract(nptr->fl_node, buf, 2);
 130                 striplt(nptr->fl_node);
 131
 132                 /* Cowardly refuse to add an any/any/any entry that would
 133                  * end up filtering every single message.
 134                  */
 135                 if (strlen(nptr->fl_user) + strlen(nptr->fl_room)
 136                    + strlen(nptr->fl_node) == 0) {
 137                         free(nptr);
 138                 }
 139                 else {
 140                         nptr->next = newlist;
 141                         newlist = nptr;
 142                 }
 143         }
 144
 145         free(serialized_list);
 146         return newlist;
 147 }
 148
 149
 150 void free_filter_list(struct FilterList *fl) {
 151         if (fl == NULL) return;
 152         free_filter_list(fl->next);
 153         free(fl);
 154 }
 155
 156
 157
 158 /*
 159  * Check the use table.  This is a list of messages which have recently
 160  * arrived on the system.  It is maintained and queried to prevent the same
 161  * message from being entered into the database multiple times if it happens
 162  * to arrive multiple times by accident.
 163  */
 164 int network_usetable(struct CtdlMessage *msg) {
 165
 166         char msgid[SIZ];
 167         struct cdbdata *cdbut;
 168         struct UseTable ut;
 169
 170         /* Bail out if we can't generate a message ID */
 171         if (msg == NULL) {
 172                 return(0);
 173         }
 174         if (msg->cm_fields['I'] == NULL) {
 175                 return(0);
 176         }
 177         if (strlen(msg->cm_fields['I']) == 0) {
 178                 return(0);
 179         }
 180
 181         /* Generate the message ID */
 182         strcpy(msgid, msg->cm_fields['I']);
 183         if (haschar(msgid, '@') == 0) {
 184                 strcat(msgid, "@");
 185                 if (msg->cm_fields['N'] != NULL) {
 186                         strcat(msgid, msg->cm_fields['N']);
 187                 }
 188                 else {
 189                         return(0);
 190                 }
 191         }
 192
 193         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 194         if (cdbut != NULL) {
 195                 cdb_free(cdbut);
 196                 return(1);
 197         }
 198
 199         /* If we got to this point, it's unique: add it. */
 200         strcpy(ut.ut_msgid, msgid);
 201         ut.ut_timestamp = time(NULL);
 202         cdb_store(CDB_USETABLE, msgid, strlen(msgid),
 203                 &ut, sizeof(struct UseTable) );
 204         return(0);
 205 }
 206
 207
 208 /*
 209  * Read the network map from its configuration file into memory.
 210  */
 211 void read_network_map(void) {
 212         char *serialized_map = NULL;
 213         int i;
 214         char buf[SIZ];
 215         struct NetMap *nmptr;
 216
 217         serialized_map = CtdlGetSysConfig(IGNETMAP);
 218         if (serialized_map == NULL) return;     /* if null, no entries */
 219
 220         /* Use the string tokenizer to grab one line at a time */
 221         for (i=0; i<num_tokens(serialized_map, '\n'); ++i) {
 222                 extract_token(buf, serialized_map, i, '\n');
 223                 nmptr = (struct NetMap *) malloc(sizeof(struct NetMap));
 224                 extract(nmptr->nodename, buf, 0);
 225                 nmptr->lastcontact = extract_long(buf, 1);
 226                 extract(nmptr->nexthop, buf, 2);
 227                 nmptr->next = the_netmap;
 228                 the_netmap = nmptr;
 229         }
 230
 231         free(serialized_map);
 232 }
 233
 234
 235 /*
 236  * Write the network map from memory back to the configuration file.
 237  */
 238 void write_network_map(void) {
 239         char *serialized_map = NULL;
 240         struct NetMap *nmptr;
 241
 242         serialized_map = strdup("");
 243
 244         if (the_netmap != NULL) {
 245                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 246                         serialized_map = realloc(serialized_map,
 247                                                 (strlen(serialized_map)+SIZ) );
 248                         if (strlen(nmptr->nodename) > 0) {
 249                                 snprintf(&serialized_map[strlen(serialized_map)],
 250                                         SIZ,
 251                                         "%s|%ld|%s\n",
 252                                         nmptr->nodename,
 253                                         (long)nmptr->lastcontact,
 254                                         nmptr->nexthop);
 255                         }
 256                 }
 257         }
 258
 259         CtdlPutSysConfig(IGNETMAP, serialized_map);
 260         free(serialized_map);
 261
 262         /* Now free the list */
 263         while (the_netmap != NULL) {
 264                 nmptr = the_netmap->next;
 265                 free(the_netmap);
 266                 the_netmap = nmptr;
 267         }
 268 }
 269
 270
 271
 272 /*
 273  * Check the network map and determine whether the supplied node name is
 274  * valid.  If it is not a neighbor node, supply the name of a neighbor node
 275  * which is the next hop.  If it *is* a neighbor node, we also fill in the
 276  * shared secret.
 277  */
 278 int is_valid_node(char *nexthop, char *secret, char *node) {
 279         int i;
 280         char linebuf[SIZ];
 281         char buf[SIZ];
 282         int retval;
 283         struct NetMap *nmptr;
 284
 285         if (node == NULL) {
 286                 return(-1);
 287         }
 288
 289         /*
 290          * First try the neighbor nodes
 291          */
 292         if (working_ignetcfg == NULL) {
 293                 lprintf(CTDL_ERR, "working_ignetcfg is NULL!\n");
 294                 if (nexthop != NULL) {
 295                         strcpy(nexthop, "");
 296                 }
 297                 return(-1);
 298         }
 299
 300         retval = (-1);
 301         if (nexthop != NULL) {
 302                 strcpy(nexthop, "");
 303         }
 304
 305         /* Use the string tokenizer to grab one line at a time */
 306         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
 307                 extract_token(linebuf, working_ignetcfg, i, '\n');
 308                 extract(buf, linebuf, 0);
 309                 if (!strcasecmp(buf, node)) {
 310                         if (nexthop != NULL) {
 311                                 strcpy(nexthop, "");
 312                         }
 313                         if (secret != NULL) {
 314                                 extract(secret, linebuf, 1);
 315                         }
 316                         retval = 0;
 317                 }
 318         }
 319
 320         if (retval == 0) {
 321                 return(retval);         /* yup, it's a direct neighbor */
 322         }
 323
 324         /*
 325          * If we get to this point we have to see if we know the next hop
 326          */
 327         if (the_netmap != NULL) {
 328                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 329                         if (!strcasecmp(nmptr->nodename, node)) {
 330                                 if (nexthop != NULL) {
 331                                         strcpy(nexthop, nmptr->nexthop);
 332                                 }
 333                                 return(0);
 334                         }
 335                 }
 336         }
 337
 338         /*
 339          * If we get to this point, the supplied node name is bogus.
 340          */
 341         lprintf(CTDL_ERR, "Invalid node name <%s>\n", node);
 342         return(-1);
 343 }
 344
 345
 346
 347
 348
 349 void cmd_gnet(char *argbuf) {
 350         char filename[SIZ];
 351         char buf[SIZ];
 352         FILE *fp;
 353
 354         if (CtdlAccessCheck(ac_room_aide)) return;
 355         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 356         cprintf("%d Network settings for room #%ld <%s>\n",
 357                 LISTING_FOLLOWS,
 358                 CC->room.QRnumber, CC->room.QRname);
 359
 360         fp = fopen(filename, "r");
 361         if (fp != NULL) {
 362                 while (fgets(buf, sizeof buf, fp) != NULL) {
 363                         buf[strlen(buf)-1] = 0;
 364                         cprintf("%s\n", buf);
 365                 }
 366                 fclose(fp);
 367         }
 368
 369         cprintf("000\n");
 370 }
 371
 372
 373 void cmd_snet(char *argbuf) {
 374         char tempfilename[SIZ];
 375         char filename[SIZ];
 376         char buf[SIZ];
 377         FILE *fp;
 378
 379         unbuffer_output();
 380
 381         if (CtdlAccessCheck(ac_room_aide)) return;
 382         safestrncpy(tempfilename, tmpnam(NULL), sizeof tempfilename);
 383         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 384
 385         fp = fopen(tempfilename, "w");
 386         if (fp == NULL) {
 387                 cprintf("%d Cannot open %s: %s\n",
 388                         ERROR + INTERNAL_ERROR,
 389                         tempfilename,
 390                         strerror(errno));
 391         }
 392
 393         cprintf("%d %s\n", SEND_LISTING, tempfilename);
 394         while (client_gets(buf), strcmp(buf, "000")) {
 395                 fprintf(fp, "%s\n", buf);
 396         }
 397         fclose(fp);
 398
 399         /* Now copy the temp file to its permanent location
 400          * (We use /bin/mv instead of link() because they may be on
 401          * different filesystems)
 402          */
 403         unlink(filename);
 404         snprintf(buf, sizeof buf, "/bin/mv %s %s", tempfilename, filename);
 405         begin_critical_section(S_NETCONFIGS);
 406         system(buf);
 407         end_critical_section(S_NETCONFIGS);
 408 }
 409
 410
 411 /*
 412  * Spools out one message from the list.
 413  */
 414 void network_spool_msg(long msgnum, void *userdata) {
 415         struct SpoolControl *sc;
 416         int err;
 417         int i;
 418         char *newpath = NULL;
 419         char *instr = NULL;
 420         size_t instr_len = SIZ;
 421         struct CtdlMessage *msg = NULL;
 422         struct CtdlMessage *imsg;
 423         struct namelist *nptr;
 424         struct maplist *mptr;
 425         struct ser_ret sermsg;
 426         FILE *fp;
 427         char filename[SIZ];
 428         char buf[SIZ];
 429         int bang = 0;
 430         int send = 1;
 431         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 432         long list_msgnum = 0L;
 433         int ok_to_participate = 0;
 434
 435         sc = (struct SpoolControl *)userdata;
 436
 437         /*
 438          * Process mailing list recipients
 439          */
 440         instr_len = SIZ;
 441         if (sc->listrecps != NULL) {
 442
 443                 /* First, copy it to the spoolout room */
 444                 err = CtdlSaveMsgPointerInRoom(SMTP_SPOOLOUT_ROOM, msgnum, 0);
 445                 if (err != 0) return;
 446
 447                 /*
 448                  * Figure out how big a buffer we need to allocate
 449                  */
 450                 for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 451                         instr_len = instr_len + strlen(nptr->name);
 452                 }
 453
 454                 /*
 455                  * allocate...
 456                  */
 457                 lprintf(CTDL_DEBUG, "Generating delivery instructions\n");
 458                 instr = malloc(instr_len);
 459                 if (instr == NULL) {
 460                         lprintf(CTDL_EMERG,
 461                                 "Cannot allocate %ld bytes for instr...\n",
 462                                 (long)instr_len);
 463                         abort();
 464                 }
 465                 snprintf(instr, instr_len,
 466                         "Content-type: %s\n\nmsgid|%ld\nsubmitted|%ld\n"
 467                         "bounceto|postmaster@%s\n" ,
 468                         SPOOLMIME, msgnum, (long)time(NULL), config.c_fqdn );
 469
 470                 /* Generate delivery instructions for each recipient */
 471                 for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 472                         size_t tmp = strlen(instr);
 473                         snprintf(&instr[tmp], instr_len - tmp,
 474                                  "remote|%s|0||\n", nptr->name);
 475                 }
 476
 477                 /*
 478                  * Generate a message from the instructions
 479                  */
 480                 imsg = malloc(sizeof(struct CtdlMessage));
 481                 memset(imsg, 0, sizeof(struct CtdlMessage));
 482                 imsg->cm_magic = CTDLMESSAGE_MAGIC;
 483                 imsg->cm_anon_type = MES_NORMAL;
 484                 imsg->cm_format_type = FMT_RFC822;
 485                 imsg->cm_fields['A'] = strdup("Citadel");
 486                 imsg->cm_fields['M'] = instr;
 487
 488                 /* Save delivery instructions in spoolout room */
 489                 CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM);
 490                 CtdlFreeMessage(imsg);
 491         }
 492
 493         /*
 494          * Process digest recipients
 495          */
 496         if ((sc->digestrecps != NULL) && (sc->digestfp != NULL)) {
 497                 fprintf(sc->digestfp,   " -----------------------------------"
 498                                         "------------------------------------"
 499                                         "-------\n");
 500                 CtdlRedirectOutput(sc->digestfp, -1);
 501                 CtdlOutputMsg(msgnum, MT_RFC822, HEADERS_ALL, 0, 0);
 502                 CtdlRedirectOutput(NULL, -1);
 503                 sc->num_msgs_spooled += 1;
 504         }
 505
 506         /*
 507          * Process client-side list participations for this room
 508          */
 509         instr_len = SIZ;
 510         if (sc->participates != NULL) {
 511                 msg = CtdlFetchMessage(msgnum, 1);
 512                 if (msg != NULL) {
 513
 514                         /* Only send messages which originated on our own Citadel
 515                          * network, otherwise we'll end up sending the remote
 516                          * mailing list's messages back to it, which is rude...
 517                          */
 518                         ok_to_participate = 0;
 519                         if (msg->cm_fields['N'] != NULL) {
 520                                 if (!strcasecmp(msg->cm_fields['N'], config.c_nodename)) {
 521                                         ok_to_participate = 1;
 522                                 }
 523                                 if (is_valid_node(NULL, NULL, msg->cm_fields['N']) == 0) {
 524                                         ok_to_participate = 1;
 525                                 }
 526                         }
 527                         if (ok_to_participate) {
 528                                 if (msg->cm_fields['F'] != NULL) {
 529                                         free(msg->cm_fields['F']);
 530                                 }
 531                                 msg->cm_fields['F'] = malloc(SIZ);
 532                                 /* Replace the Internet email address of the actual
 533                                 * author with the email address of the room itself,
 534                                 * so the remote listserv doesn't reject us.
 535                                 * FIXME ... I want to be able to pick any address
 536                                 */
 537                                 snprintf(msg->cm_fields['F'], SIZ,
 538                                         "room_%s@%s", CC->room.QRname,
 539                                         config.c_fqdn);
 540                                 for (i=0; i<strlen(msg->cm_fields['F']); ++i) {
 541                                         if (isspace(msg->cm_fields['F'][i])) {
 542                                                 msg->cm_fields['F'][i] = '_';
 543                                         }
 544                                 }
 545
 546                                 /* Now save it and generate delivery instructions */
 547                                 list_msgnum = CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM);
 548
 549                                 /*
 550                                  * Figure out how big a buffer we need to allocate
 551                                  */
 552                                 for (nptr = sc->participates; nptr != NULL; nptr = nptr->next) {
 553                                         instr_len = instr_len + strlen(nptr->name);
 554                                 }
 555
 556                                 /*
 557                                  * allocate...
 558                                  */
 559                                 instr = malloc(instr_len);
 560                                 if (instr == NULL) {
 561                                         lprintf(CTDL_EMERG,
 562                                                 "Cannot allocate %ld bytes for instr...\n",
 563                                                 (long)instr_len);
 564                                         abort();
 565                                 }
 566                                 snprintf(instr, instr_len,
 567                                         "Content-type: %s\n\nmsgid|%ld\nsubmitted|%ld\n"
 568                                         "bounceto|postmaster@%s\n" ,
 569                                         SPOOLMIME, list_msgnum, (long)time(NULL), config.c_fqdn );
 570
 571                                 /* Generate delivery instructions for each recipient */
 572                                 for (nptr = sc->participates; nptr != NULL; nptr = nptr->next) {
 573                                         size_t tmp = strlen(instr);
 574                                         snprintf(&instr[tmp], instr_len - tmp,
 575                                                  "remote|%s|0||\n", nptr->name);
 576                                 }
 577
 578                                 /*
 579                                  * Generate a message from the instructions
 580                                  */
 581                                 imsg = malloc(sizeof(struct CtdlMessage));
 582                                 memset(imsg, 0, sizeof(struct CtdlMessage));
 583                                 imsg->cm_magic = CTDLMESSAGE_MAGIC;
 584                                 imsg->cm_anon_type = MES_NORMAL;
 585                                 imsg->cm_format_type = FMT_RFC822;
 586                                 imsg->cm_fields['A'] = strdup("Citadel");
 587                                 imsg->cm_fields['M'] = instr;
 588
 589                                 /* Save delivery instructions in spoolout room */
 590                                 CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM);
 591                                 CtdlFreeMessage(imsg);
 592                         }
 593                         CtdlFreeMessage(msg);
 594                 }
 595         }
 596
 597         /*
 598          * Process IGnet push shares
 599          */
 600         if (sc->ignet_push_shares != NULL) {
 601
 602                 msg = CtdlFetchMessage(msgnum, 1);
 603                 if (msg != NULL) {
 604                         size_t newpath_len;
 605
 606                         /* Prepend our node name to the Path field whenever
 607                          * sending a message to another IGnet node
 608                          */
 609                         if (msg->cm_fields['P'] == NULL) {
 610                                 msg->cm_fields['P'] = strdup("username");
 611                         }
 612                         newpath_len = strlen(msg->cm_fields['P']) +
 613                                  strlen(config.c_nodename) + 2;
 614                         newpath = malloc(newpath_len);
 615                         snprintf(newpath, newpath_len, "%s!%s",
 616                                  config.c_nodename, msg->cm_fields['P']);
 617                         free(msg->cm_fields['P']);
 618                         msg->cm_fields['P'] = newpath;
 619
 620                         /*
 621                          * Determine if this message is set to be deleted
 622                          * after sending out on the network
 623                          */
 624                         if (msg->cm_fields['S'] != NULL) {
 625                                 if (!strcasecmp(msg->cm_fields['S'],
 626                                    "CANCEL")) {
 627                                         delete_after_send = 1;
 628                                 }
 629                         }
 630
 631                         /* Now send it to every node */
 632                         for (mptr = sc->ignet_push_shares; mptr != NULL;
 633                             mptr = mptr->next) {
 634
 635                                 send = 1;
 636
 637                                 /* Check for valid node name */
 638                                 if (is_valid_node(NULL, NULL, mptr->remote_nodename) != 0) {
 639                                         lprintf(CTDL_ERR, "Invalid node <%s>\n",
 640                                                 mptr->remote_nodename);
 641                                         send = 0;
 642                                 }
 643
 644                                 /* Check for split horizon */
 645                                 lprintf(CTDL_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 646                                 bang = num_tokens(msg->cm_fields['P'], '!');
 647                                 if (bang > 1) for (i=0; i<(bang-1); ++i) {
 648                                         extract_token(buf, msg->cm_fields['P'],
 649                                                 i, '!');
 650                                         if (!strcasecmp(buf, mptr->remote_nodename)) {
 651                                                 send = 0;
 652                                         }
 653                                 }
 654
 655                                 /* Send the message */
 656                                 if (send == 1) {
 657
 658                                         /*
 659                                          * Force the message to appear in the correct room
 660                                          * on the far end by setting the C field correctly
 661                                          */
 662                                         if (msg->cm_fields['C'] != NULL) {
 663                                                 free(msg->cm_fields['C']);
 664                                         }
 665                                         if (strlen(mptr->remote_roomname) > 0) {
 666                                                 msg->cm_fields['C'] = strdup(mptr->remote_roomname);
 667                                         }
 668                                         else {
 669                                                 msg->cm_fields['C'] = strdup(CC->room.QRname);
 670                                         }
 671
 672                                         /* serialize it for transmission */
 673                                         serialize_message(&sermsg, msg);
 674
 675                                         /* write it to the spool file */
 676                                         snprintf(filename, sizeof filename,
 677                                                 "./network/spoolout/%s",
 678                                                 mptr->remote_nodename);
 679                                         fp = fopen(filename, "ab");
 680                                         if (fp != NULL) {
 681                                                 fwrite(sermsg.ser,
 682                                                         sermsg.len, 1, fp);
 683                                                 fclose(fp);
 684                                         }
 685
 686                                         /* free the serialized version */
 687                                         free(sermsg.ser);
 688                                 }
 689                         }
 690                         CtdlFreeMessage(msg);
 691                 }
 692         }
 693
 694         /* update lastsent */
 695         sc->lastsent = msgnum;
 696
 697         /* Delete this message if delete-after-send is set */
 698         if (delete_after_send) {
 699                 CtdlDeleteMessages(CC->room.QRname, msgnum, "");
 700         }
 701
 702 }
 703
 704
 705 /*
 706  * Deliver digest messages
 707  */
 708 void network_deliver_digest(struct SpoolControl *sc) {
 709         char buf[SIZ];
 710         int i;
 711         struct CtdlMessage *msg;
 712         long msglen;
 713         long msgnum;
 714         char *instr = NULL;
 715         size_t instr_len = SIZ;
 716         struct CtdlMessage *imsg;
 717         struct namelist *nptr;
 718
 719         if (sc->num_msgs_spooled < 1) {
 720                 fclose(sc->digestfp);
 721                 sc->digestfp = NULL;
 722                 return;
 723         }
 724
 725         msg = malloc(sizeof(struct CtdlMessage));
 726         memset(msg, 0, sizeof(struct CtdlMessage));
 727         msg->cm_magic = CTDLMESSAGE_MAGIC;
 728         msg->cm_format_type = FMT_RFC822;
 729         msg->cm_anon_type = MES_NORMAL;
 730
 731         sprintf(buf, "%ld", time(NULL));
 732         msg->cm_fields['T'] = strdup(buf);
 733         msg->cm_fields['A'] = strdup(CC->room.QRname);
 734         msg->cm_fields['U'] = strdup(CC->room.QRname);
 735         sprintf(buf, "room_%s@%s", CC->room.QRname, config.c_fqdn);
 736         for (i=0; i<strlen(buf); ++i) {
 737                 if (isspace(buf[i])) buf[i]='_';
 738                 buf[i] = tolower(buf[i]);
 739         }
 740         msg->cm_fields['F'] = strdup(buf);
 741
 742         fseek(sc->digestfp, 0L, SEEK_END);
 743         msglen = ftell(sc->digestfp);
 744
 745         msg->cm_fields['M'] = malloc(msglen + 1);
 746         fseek(sc->digestfp, 0L, SEEK_SET);
 747         fread(msg->cm_fields['M'], (size_t)msglen, 1, sc->digestfp);
 748         msg->cm_fields['M'][msglen] = 0;
 749
 750         fclose(sc->digestfp);
 751         sc->digestfp = NULL;
 752
 753         msgnum = CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM);
 754         CtdlFreeMessage(msg);
 755
 756         /* Now generate the delivery instructions */
 757
 758         /*
 759          * Figure out how big a buffer we need to allocate
 760          */
 761         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 762                 instr_len = instr_len + strlen(nptr->name);
 763         }
 764
 765         /*
 766          * allocate...
 767          */
 768         lprintf(CTDL_DEBUG, "Generating delivery instructions\n");
 769         instr = malloc(instr_len);
 770         if (instr == NULL) {
 771                 lprintf(CTDL_EMERG, "Cannot allocate %ld bytes for instr...\n",
 772                         (long)instr_len);
 773                 abort();
 774         }
 775         snprintf(instr, instr_len,
 776                 "Content-type: %s\n\nmsgid|%ld\nsubmitted|%ld\n"
 777                 "bounceto|postmaster@%s\n" ,
 778                 SPOOLMIME, msgnum, (long)time(NULL), config.c_fqdn );
 779
 780         /* Generate delivery instructions for each recipient */
 781         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 782                 size_t tmp = strlen(instr);
 783                 snprintf(&instr[tmp], instr_len - tmp,
 784                          "remote|%s|0||\n", nptr->name);
 785         }
 786
 787         /*
 788          * Generate a message from the instructions
 789          */
 790         imsg = malloc(sizeof(struct CtdlMessage));
 791         memset(imsg, 0, sizeof(struct CtdlMessage));
 792         imsg->cm_magic = CTDLMESSAGE_MAGIC;
 793         imsg->cm_anon_type = MES_NORMAL;
 794         imsg->cm_format_type = FMT_RFC822;
 795         imsg->cm_fields['A'] = strdup("Citadel");
 796         imsg->cm_fields['M'] = instr;
 797
 798         /* Save delivery instructions in spoolout room */
 799         CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM);
 800         CtdlFreeMessage(imsg);
 801 }
 802
 803
 804 /*
 805  * Batch up and send all outbound traffic from the current room
 806  */
 807 void network_spoolout_room(char *room_to_spool) {
 808         char filename[SIZ];
 809         char buf[SIZ];
 810         char instr[SIZ];
 811         char nodename[SIZ];
 812         char roomname[SIZ];
 813         char nexthop[SIZ];
 814         FILE *fp;
 815         struct SpoolControl sc;
 816         struct namelist *nptr = NULL;
 817         struct maplist *mptr = NULL;
 818         size_t miscsize = 0;
 819         size_t linesize = 0;
 820         int skipthisline = 0;
 821         int i;
 822
 823         if (getroom(&CC->room, room_to_spool) != 0) {
 824                 lprintf(CTDL_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
 825                 return;
 826         }
 827
 828         memset(&sc, 0, sizeof(struct SpoolControl));
 829         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 830
 831         begin_critical_section(S_NETCONFIGS);
 832
 833         fp = fopen(filename, "r");
 834         if (fp == NULL) {
 835                 end_critical_section(S_NETCONFIGS);
 836                 return;
 837         }
 838
 839         lprintf(CTDL_INFO, "Networking started for <%s>\n", CC->room.QRname);
 840
 841         while (fgets(buf, sizeof buf, fp) != NULL) {
 842                 buf[strlen(buf)-1] = 0;
 843
 844                 extract(instr, buf, 0);
 845                 if (!strcasecmp(instr, "lastsent")) {
 846                         sc.lastsent = extract_long(buf, 1);
 847                 }
 848                 else if (!strcasecmp(instr, "listrecp")) {
 849                         nptr = (struct namelist *)
 850                                 malloc(sizeof(struct namelist));
 851                         nptr->next = sc.listrecps;
 852                         extract(nptr->name, buf, 1);
 853                         sc.listrecps = nptr;
 854                 }
 855                 else if (!strcasecmp(instr, "participate")) {
 856                         nptr = (struct namelist *)
 857                                 malloc(sizeof(struct namelist));
 858                         nptr->next = sc.participates;
 859                         extract(nptr->name, buf, 1);
 860                         sc.participates = nptr;
 861                 }
 862                 else if (!strcasecmp(instr, "digestrecp")) {
 863                         nptr = (struct namelist *)
 864                                 malloc(sizeof(struct namelist));
 865                         nptr->next = sc.digestrecps;
 866                         extract(nptr->name, buf, 1);
 867                         sc.digestrecps = nptr;
 868                 }
 869                 else if (!strcasecmp(instr, "ignet_push_share")) {
 870                         /* by checking each node's validity, we automatically
 871                          * purge nodes which do not exist from room network
 872                          * configurations at this time.
 873                          */
 874                         extract(nodename, buf, 1);
 875                         extract(roomname, buf, 2);
 876                         strcpy(nexthop, "xxx");
 877                         if (is_valid_node(nexthop, NULL, nodename) == 0) {
 878                                 if (strlen(nexthop) == 0) {
 879                                         mptr = (struct maplist *)
 880                                                 malloc(sizeof(struct maplist));
 881                                         mptr->next = sc.ignet_push_shares;
 882                                         strcpy(mptr->remote_nodename, nodename);
 883                                         strcpy(mptr->remote_roomname, roomname);
 884                                         sc.ignet_push_shares = mptr;
 885                                 }
 886                         }
 887                 }
 888                 else {
 889                         /* Preserve 'other' lines ... *unless* they happen to
 890                          * be subscribe/unsubscribe pendings with expired
 891                          * timestamps.
 892                          */
 893                         skipthisline = 0;
 894                         if (!strncasecmp(buf, "subpending|", 11)) {
 895                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
 896                                         skipthisline = 1;
 897                                 }
 898                         }
 899                         if (!strncasecmp(buf, "unsubpending|", 13)) {
 900                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
 901                                         skipthisline = 1;
 902                                 }
 903                         }
 904
 905                         if (skipthisline == 0) {
 906                                 linesize = strlen(buf);
 907                                 sc.misc = realloc(sc.misc,
 908                                         (miscsize + linesize + 2) );
 909                                 sprintf(&sc.misc[miscsize], "%s\n", buf);
 910                                 miscsize = miscsize + linesize + 1;
 911                         }
 912                 }
 913
 914
 915         }
 916         fclose(fp);
 917
 918         /* If there are digest recipients, we have to build a digest */
 919         if (sc.digestrecps != NULL) {
 920                 sc.digestfp = tmpfile();
 921                 fprintf(sc.digestfp, "Content-type: text/plain\n\n");
 922         }
 923
 924         /* Do something useful */
 925         CtdlForEachMessage(MSGS_GT, sc.lastsent, NULL, NULL,
 926                 network_spool_msg, &sc);
 927
 928         /* If we wrote a digest, deliver it and then close it */
 929         snprintf(buf, sizeof buf, "room_%s@%s",
 930                 CC->room.QRname, config.c_fqdn);
 931         for (i=0; i<strlen(buf); ++i) {
 932                 buf[i] = tolower(buf[i]);
 933                 if (isspace(buf[i])) buf[i] = '_';
 934         }
 935         if (sc.digestfp != NULL) {
 936                 fprintf(sc.digestfp,    " -----------------------------------"
 937                                         "------------------------------------"
 938                                         "-------\n"
 939                                         "You are subscribed to the '%s' "
 940                                         "list.\n"
 941                                         "To post to the list: %s\n",
 942                                         CC->room.QRname, buf
 943                 );
 944                 network_deliver_digest(&sc);    /* deliver and close */
 945         }
 946
 947         /* Now rewrite the config file */
 948         fp = fopen(filename, "w");
 949         if (fp == NULL) {
 950                 lprintf(CTDL_CRIT, "ERROR: cannot open %s: %s\n",
 951                         filename, strerror(errno));
 952         }
 953         else {
 954                 fprintf(fp, "lastsent|%ld\n", sc.lastsent);
 955
 956                 /* Write out the listrecps while freeing from memory at the
 957                  * same time.  Am I clever or what?  :)
 958                  */
 959                 while (sc.listrecps != NULL) {
 960                         fprintf(fp, "listrecp|%s\n", sc.listrecps->name);
 961                         nptr = sc.listrecps->next;
 962                         free(sc.listrecps);
 963                         sc.listrecps = nptr;
 964                 }
 965                 /* Do the same for digestrecps */
 966                 while (sc.digestrecps != NULL) {
 967                         fprintf(fp, "digestrecp|%s\n", sc.digestrecps->name);
 968                         nptr = sc.digestrecps->next;
 969                         free(sc.digestrecps);
 970                         sc.digestrecps = nptr;
 971                 }
 972                 /* Do the same for participates */
 973                 while (sc.participates != NULL) {
 974                         fprintf(fp, "participate|%s\n", sc.participates->name);
 975                         nptr = sc.participates->next;
 976                         free(sc.participates);
 977                         sc.participates = nptr;
 978                 }
 979                 while (sc.ignet_push_shares != NULL) {
 980                         /* by checking each node's validity, we automatically
 981                          * purge nodes which do not exist from room network
 982                          * configurations at this time.
 983                          */
 984                         if (is_valid_node(NULL, NULL, sc.ignet_push_shares->remote_nodename) == 0) {
 985                         }
 986                         fprintf(fp, "ignet_push_share|%s",
 987                                 sc.ignet_push_shares->remote_nodename);
 988                         if (strlen(sc.ignet_push_shares->remote_roomname) > 0) {
 989                                 fprintf(fp, "|%s", sc.ignet_push_shares->remote_roomname);
 990                         }
 991                         fprintf(fp, "\n");
 992                         mptr = sc.ignet_push_shares->next;
 993                         free(sc.ignet_push_shares);
 994                         sc.ignet_push_shares = mptr;
 995                 }
 996                 if (sc.misc != NULL) {
 997                         fwrite(sc.misc, strlen(sc.misc), 1, fp);
 998                 }
 999                 free(sc.misc);
1000
1001                 fclose(fp);
1002         }
1003         end_critical_section(S_NETCONFIGS);
1004 }
1005
1006
1007
1008 /*
1009  * Send the *entire* contents of the current room to one specific network node,
1010  * ignoring anything we know about which messages have already undergone
1011  * network processing.  This can be used to bring a new node into sync.
1012  */
1013 int network_sync_to(char *target_node) {
1014         struct SpoolControl sc;
1015         int num_spooled = 0;
1016         int found_node = 0;
1017         char buf[SIZ];
1018         char sc_type[SIZ];
1019         char sc_node[SIZ];
1020         char sc_room[SIZ];
1021         char filename[SIZ];
1022         FILE *fp;
1023
1024         /* Grab the configuration line we're looking for */
1025         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
1026         begin_critical_section(S_NETCONFIGS);
1027         fp = fopen(filename, "r");
1028         if (fp == NULL) {
1029                 end_critical_section(S_NETCONFIGS);
1030                 return(-1);
1031         }
1032         while (fgets(buf, sizeof buf, fp) != NULL) {
1033                 buf[strlen(buf)-1] = 0;
1034                 extract(sc_type, buf, 0);
1035                 extract(sc_node, buf, 1);
1036                 extract(sc_room, buf, 2);
1037                 if ( (!strcasecmp(sc_type, "ignet_push_share"))
1038                    && (!strcasecmp(sc_node, target_node)) ) {
1039                         found_node = 1;
1040
1041                         /* Concise syntax because we don't need a full linked-list */
1042                         memset(&sc, 0, sizeof(struct SpoolControl));
1043                         sc.ignet_push_shares = (struct maplist *)
1044                                 malloc(sizeof(struct maplist));
1045                         sc.ignet_push_shares->next = NULL;
1046                         safestrncpy(sc.ignet_push_shares->remote_nodename,
1047                                 sc_node,
1048                                 sizeof sc.ignet_push_shares->remote_nodename);
1049                         safestrncpy(sc.ignet_push_shares->remote_roomname,
1050                                 sc_room,
1051                                 sizeof sc.ignet_push_shares->remote_roomname);
1052                 }
1053         }
1054         fclose(fp);
1055         end_critical_section(S_NETCONFIGS);
1056
1057         if (!found_node) return(-1);
1058
1059         /* Send ALL messages */
1060         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL,
1061                 network_spool_msg, &sc);
1062
1063         /* Concise cleanup because we know there's only one node in the sc */
1064         free(sc.ignet_push_shares);
1065
1066         lprintf(CTDL_NOTICE, "Synchronized %d messages to <%s>\n",
1067                 num_spooled, target_node);
1068         return(num_spooled);
1069 }
1070
1071
1072 /*
1073  * Implements the NSYN command
1074  */
1075 void cmd_nsyn(char *argbuf) {
1076         int num_spooled;
1077         char target_node[SIZ];
1078
1079         if (CtdlAccessCheck(ac_aide)) return;
1080
1081         extract(target_node, argbuf, 0);
1082         num_spooled = network_sync_to(target_node);
1083         if (num_spooled >= 0) {
1084                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
1085         }
1086         else {
1087                 cprintf("%d No such room/node share exists.\n",
1088                         ERROR + ROOM_NOT_FOUND);
1089         }
1090 }
1091
1092
1093
1094 /*
1095  * Batch up and send all outbound traffic from the current room
1096  */
1097 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
1098         struct RoomProcList *ptr;
1099
1100         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
1101         if (ptr == NULL) return;
1102
1103         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
1104         ptr->next = rplist;
1105         rplist = ptr;
1106 }
1107
1108
1109 /*
1110  * Learn topology from path fields
1111  */
1112 void network_learn_topology(char *node, char *path) {
1113         char nexthop[SIZ];
1114         struct NetMap *nmptr;
1115
1116         strcpy(nexthop, "");
1117
1118         if (num_tokens(path, '!') < 3) return;
1119         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
1120                 if (!strcasecmp(nmptr->nodename, node)) {
1121                         extract_token(nmptr->nexthop, path, 0, '!');
1122                         nmptr->lastcontact = time(NULL);
1123                         return;
1124                 }
1125         }
1126
1127         /* If we got here then it's not in the map, so add it. */
1128         nmptr = (struct NetMap *) malloc(sizeof (struct NetMap));
1129         strcpy(nmptr->nodename, node);
1130         nmptr->lastcontact = time(NULL);
1131         extract_token(nmptr->nexthop, path, 0, '!');
1132         nmptr->next = the_netmap;
1133         the_netmap = nmptr;
1134 }
1135
1136
1137
1138
1139 /*
1140  * Bounce a message back to the sender
1141  */
1142 void network_bounce(struct CtdlMessage *msg, char *reason) {
1143         char *oldpath = NULL;
1144         char buf[SIZ];
1145         char bouncesource[SIZ];
1146         char recipient[SIZ];
1147         struct recptypes *valid = NULL;
1148         char force_room[ROOMNAMELEN];
1149         static int serialnum = 0;
1150         size_t size;
1151
1152         lprintf(CTDL_DEBUG, "entering network_bounce()\n");
1153
1154         if (msg == NULL) return;
1155
1156         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
1157
1158         /*
1159          * Give it a fresh message ID
1160          */
1161         if (msg->cm_fields['I'] != NULL) {
1162                 free(msg->cm_fields['I']);
1163         }
1164         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
1165                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
1166         msg->cm_fields['I'] = strdup(buf);
1167
1168         /*
1169          * FIXME ... right now we're just sending a bounce; we really want to
1170          * include the text of the bounced message.
1171          */
1172         if (msg->cm_fields['M'] != NULL) {
1173                 free(msg->cm_fields['M']);
1174         }
1175         msg->cm_fields['M'] = strdup(reason);
1176         msg->cm_format_type = 0;
1177
1178         /*
1179          * Turn the message around
1180          */
1181         if (msg->cm_fields['R'] == NULL) {
1182                 free(msg->cm_fields['R']);
1183         }
1184
1185         if (msg->cm_fields['D'] == NULL) {
1186                 free(msg->cm_fields['D']);
1187         }
1188
1189         snprintf(recipient, sizeof recipient, "%s@%s",
1190                 msg->cm_fields['A'], msg->cm_fields['N']);
1191
1192         if (msg->cm_fields['A'] == NULL) {
1193                 free(msg->cm_fields['A']);
1194         }
1195
1196         if (msg->cm_fields['N'] == NULL) {
1197                 free(msg->cm_fields['N']);
1198         }
1199
1200         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1201         msg->cm_fields['N'] = strdup(config.c_nodename);
1202
1203
1204         /* prepend our node to the path */
1205         if (msg->cm_fields['P'] != NULL) {
1206                 oldpath = msg->cm_fields['P'];
1207                 msg->cm_fields['P'] = NULL;
1208         }
1209         else {
1210                 oldpath = strdup("unknown_user");
1211         }
1212         size = strlen(oldpath) + SIZ;
1213         msg->cm_fields['P'] = malloc(size);
1214         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1215         free(oldpath);
1216
1217         /* Now submit the message */
1218         valid = validate_recipients(recipient);
1219         if (valid != NULL) if (valid->num_error > 0) {
1220                 free(valid);
1221                 valid = NULL;
1222         }
1223         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1224                 strcpy(force_room, config.c_aideroom);
1225         }
1226         else {
1227                 strcpy(force_room, "");
1228         }
1229         if ( (valid == NULL) && (strlen(force_room) == 0) ) {
1230                 strcpy(force_room, config.c_aideroom);
1231         }
1232         CtdlSubmitMsg(msg, valid, force_room);
1233
1234         /* Clean up */
1235         if (valid != NULL) free(valid);
1236         CtdlFreeMessage(msg);
1237         lprintf(CTDL_DEBUG, "leaving network_bounce()\n");
1238 }
1239
1240
1241
1242
1243 /*
1244  * Process a buffer containing a single message from a single file
1245  * from the inbound queue
1246  */
1247 void network_process_buffer(char *buffer, long size) {
1248         struct CtdlMessage *msg;
1249         long pos;
1250         int field;
1251         struct recptypes *recp = NULL;
1252         char target_room[ROOMNAMELEN];
1253         struct ser_ret sermsg;
1254         char *oldpath = NULL;
1255         char filename[SIZ];
1256         FILE *fp;
1257         char nexthop[SIZ];
1258         unsigned char firstbyte;
1259         unsigned char lastbyte;
1260
1261         /* Validate just a little bit.  First byte should be FF and
1262          * last byte should be 00.
1263          */
1264         memcpy(&firstbyte, &buffer[0], 1);
1265         memcpy(&lastbyte, &buffer[size-1], 1);
1266         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1267                 lprintf(CTDL_ERR, "Corrupt message!  Ignoring.\n");
1268                 return;
1269         }
1270
1271         /* Set default target room to trash */
1272         strcpy(target_room, TWITROOM);
1273
1274         /* Load the message into memory */
1275         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1276         memset(msg, 0, sizeof(struct CtdlMessage));
1277         msg->cm_magic = CTDLMESSAGE_MAGIC;
1278         msg->cm_anon_type = buffer[1];
1279         msg->cm_format_type = buffer[2];
1280
1281         for (pos = 3; pos < size; ++pos) {
1282                 field = buffer[pos];
1283                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1284                 pos = pos + strlen(&buffer[(int)pos]);
1285         }
1286
1287         /* Check for message routing */
1288         if (msg->cm_fields['D'] != NULL) {
1289                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1290
1291                         /* route the message */
1292                         strcpy(nexthop, "");
1293                         if (is_valid_node(nexthop, NULL,
1294                            msg->cm_fields['D']) == 0) {
1295
1296                                 /* prepend our node to the path */
1297                                 if (msg->cm_fields['P'] != NULL) {
1298                                         oldpath = msg->cm_fields['P'];
1299                                         msg->cm_fields['P'] = NULL;
1300                                 }
1301                                 else {
1302                                         oldpath = strdup("unknown_user");
1303                                 }
1304                                 size = strlen(oldpath) + SIZ;
1305                                 msg->cm_fields['P'] = malloc(size);
1306                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1307                                         config.c_nodename, oldpath);
1308                                 free(oldpath);
1309
1310                                 /* serialize the message */
1311                                 serialize_message(&sermsg, msg);
1312
1313                                 /* now send it */
1314                                 if (strlen(nexthop) == 0) {
1315                                         strcpy(nexthop, msg->cm_fields['D']);
1316                                 }
1317                                 snprintf(filename, sizeof filename,
1318                                         "./network/spoolout/%s", nexthop);
1319                                 fp = fopen(filename, "ab");
1320                                 if (fp != NULL) {
1321                                         fwrite(sermsg.ser,
1322                                                 sermsg.len, 1, fp);
1323                                         fclose(fp);
1324                                 }
1325                                 free(sermsg.ser);
1326                                 CtdlFreeMessage(msg);
1327                                 return;
1328                         }
1329
1330                         else {  /* invalid destination node name */
1331
1332                                 network_bounce(msg,
1333 "A message you sent could not be delivered due to an invalid destination node"
1334 " name.  Please check the address and try sending the message again.\n");
1335                                 msg = NULL;
1336                                 return;
1337
1338                         }
1339                 }
1340         }
1341
1342         /*
1343          * Check to see if we already have a copy of this message, and
1344          * abort its processing if so.  (We used to post a warning to Aide>
1345          * every time this happened, but the network is now so densely
1346          * connected that it's inevitable.)
1347          */
1348         if (network_usetable(msg) != 0) {
1349                 return;
1350         }
1351
1352         /* Learn network topology from the path */
1353         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1354                 network_learn_topology(msg->cm_fields['N'],
1355                                         msg->cm_fields['P']);
1356         }
1357
1358         /* Is the sending node giving us a very persuasive suggestion about
1359          * which room this message should be saved in?  If so, go with that.
1360          */
1361         if (msg->cm_fields['C'] != NULL) {
1362                 safestrncpy(target_room,
1363                         msg->cm_fields['C'],
1364                         sizeof target_room);
1365         }
1366
1367         /* Otherwise, does it have a recipient?  If so, validate it... */
1368         else if (msg->cm_fields['R'] != NULL) {
1369                 recp = validate_recipients(msg->cm_fields['R']);
1370                 if (recp != NULL) if (recp->num_error > 0) {
1371                         network_bounce(msg,
1372 "A message you sent could not be delivered due to an invalid address.\n"
1373 "Please check the address and try sending the message again.\n");
1374                         msg = NULL;
1375                         free(recp);
1376                         return;
1377                 }
1378                 strcpy(target_room, "");        /* no target room if mail */
1379         }
1380
1381         /* Our last shot at finding a home for this message is to see if
1382          * it has the O field (Originating room) set.
1383          */
1384         else if (msg->cm_fields['O'] != NULL) {
1385                 safestrncpy(target_room,
1386                         msg->cm_fields['O'],
1387                         sizeof target_room);
1388         }
1389
1390         /* Strip out fields that are only relevant during transit */
1391         if (msg->cm_fields['D'] != NULL) {
1392                 free(msg->cm_fields['D']);
1393                 msg->cm_fields['D'] = NULL;
1394         }
1395         if (msg->cm_fields['C'] != NULL) {
1396                 free(msg->cm_fields['C']);
1397                 msg->cm_fields['C'] = NULL;
1398         }
1399
1400         /* save the message into a room */
1401         if (PerformNetprocHooks(msg, target_room) == 0) {
1402                 msg->cm_flags = CM_SKIP_HOOKS;
1403                 CtdlSubmitMsg(msg, recp, target_room);
1404         }
1405         CtdlFreeMessage(msg);
1406         free(recp);
1407 }
1408
1409
1410 /*
1411  * Process a single message from a single file from the inbound queue
1412  */
1413 void network_process_message(FILE *fp, long msgstart, long msgend) {
1414         long hold_pos;
1415         long size;
1416         char *buffer;
1417
1418         hold_pos = ftell(fp);
1419         size = msgend - msgstart + 1;
1420         buffer = malloc(size);
1421         if (buffer != NULL) {
1422                 fseek(fp, msgstart, SEEK_SET);
1423                 fread(buffer, size, 1, fp);
1424                 network_process_buffer(buffer, size);
1425                 free(buffer);
1426         }
1427
1428         fseek(fp, hold_pos, SEEK_SET);
1429 }
1430
1431
1432 /*
1433  * Process a single file from the inbound queue
1434  */
1435 void network_process_file(char *filename) {
1436         FILE *fp;
1437         long msgstart = (-1L);
1438         long msgend = (-1L);
1439         long msgcur = 0L;
1440         int ch;
1441
1442
1443         fp = fopen(filename, "rb");
1444         if (fp == NULL) {
1445                 lprintf(CTDL_CRIT, "Error opening %s: %s\n",
1446                         filename, strerror(errno));
1447                 return;
1448         }
1449
1450         lprintf(CTDL_INFO, "network: processing <%s>\n", filename);
1451
1452         /* Look for messages in the data stream and break them out */
1453         while (ch = getc(fp), ch >= 0) {
1454
1455                 if (ch == 255) {
1456                         if (msgstart >= 0L) {
1457                                 msgend = msgcur - 1;
1458                                 network_process_message(fp, msgstart, msgend);
1459                         }
1460                         msgstart = msgcur;
1461                 }
1462
1463                 ++msgcur;
1464         }
1465
1466         msgend = msgcur - 1;
1467         if (msgstart >= 0L) {
1468                 network_process_message(fp, msgstart, msgend);
1469         }
1470
1471         fclose(fp);
1472         unlink(filename);
1473 }
1474
1475
1476 /*
1477  * Process anything in the inbound queue
1478  */
1479 void network_do_spoolin(void) {
1480         DIR *dp;
1481         struct dirent *d;
1482         char filename[SIZ];
1483
1484         dp = opendir("./network/spoolin");
1485         if (dp == NULL) return;
1486
1487         while (d = readdir(dp), d != NULL) {
1488                 snprintf(filename, sizeof filename,
1489                         "./network/spoolin/%s", d->d_name);
1490                 network_process_file(filename);
1491         }
1492
1493
1494         closedir(dp);
1495 }
1496
1497
1498 /*
1499  * Delete any files in the outbound queue that were intended
1500  * to be sent to nodes which no longer exist.
1501  */
1502 void network_purge_spoolout(void) {
1503         DIR *dp;
1504         struct dirent *d;
1505         char filename[SIZ];
1506         char nexthop[SIZ];
1507         int i;
1508
1509         dp = opendir("./network/spoolout");
1510         if (dp == NULL) return;
1511
1512         while (d = readdir(dp), d != NULL) {
1513                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
1514                         continue;
1515                 snprintf(filename, sizeof filename,
1516                         "./network/spoolout/%s", d->d_name);
1517
1518                 strcpy(nexthop, "");
1519                 i = is_valid_node(nexthop, NULL, d->d_name);
1520
1521                 if ( (i != 0) || (strlen(nexthop) > 0) ) {
1522                         unlink(filename);
1523                 }
1524         }
1525
1526
1527         closedir(dp);
1528 }
1529
1530
1531
1532 /*
1533  * receive network spool from the remote system
1534  */
1535 void receive_spool(int sock, char *remote_nodename) {
1536         long download_len;
1537         long bytes_received;
1538         char buf[SIZ];
1539         static char pbuf[IGNET_PACKET_SIZE];
1540         char tempfilename[PATH_MAX];
1541         long plen;
1542         FILE *fp;
1543
1544         strcpy(tempfilename, tmpnam(NULL));
1545         if (sock_puts(sock, "NDOP") < 0) return;
1546         if (sock_gets(sock, buf) < 0) return;
1547         lprintf(CTDL_DEBUG, "<%s\n", buf);
1548         if (buf[0] != '2') {
1549                 return;
1550         }
1551         download_len = extract_long(&buf[4], 0);
1552
1553         bytes_received = 0L;
1554         fp = fopen(tempfilename, "w");
1555         if (fp == NULL) {
1556                 lprintf(CTDL_CRIT, "cannot open download file locally: %s\n",
1557                         strerror(errno));
1558                 return;
1559         }
1560
1561         while (bytes_received < download_len) {
1562                 snprintf(buf, sizeof buf, "READ %ld|%ld",
1563                         bytes_received,
1564                      ((download_len - bytes_received > IGNET_PACKET_SIZE)
1565                  ? IGNET_PACKET_SIZE : (download_len - bytes_received)));
1566                 if (sock_puts(sock, buf) < 0) {
1567                         fclose(fp);
1568                         unlink(tempfilename);
1569                         return;
1570                 }
1571                 if (sock_gets(sock, buf) < 0) {
1572                         fclose(fp);
1573                         unlink(tempfilename);
1574                         return;
1575                 }
1576                 if (buf[0] == '6') {
1577                         plen = extract_long(&buf[4], 0);
1578                         if (sock_read(sock, pbuf, plen) < 0) {
1579                                 fclose(fp);
1580                                 unlink(tempfilename);
1581                                 return;
1582                         }
1583                         fwrite((char *) pbuf, plen, 1, fp);
1584                         bytes_received = bytes_received + plen;
1585                 }
1586         }
1587
1588         fclose(fp);
1589         if (sock_puts(sock, "CLOS") < 0) {
1590                 unlink(tempfilename);
1591                 return;
1592         }
1593         if (sock_gets(sock, buf) < 0) {
1594                 unlink(tempfilename);
1595                 return;
1596         }
1597         if (download_len > 0)
1598                 lprintf(CTDL_NOTICE, "Received %ld octets from <%s>",
1599                                 download_len, remote_nodename);
1600         lprintf(CTDL_DEBUG, "%s", buf);
1601         snprintf(buf, sizeof buf, "mv %s ./network/spoolin/%s.%ld",
1602                 tempfilename, remote_nodename, (long) getpid());
1603         system(buf);
1604 }
1605
1606
1607
1608 /*
1609  * transmit network spool to the remote system
1610  */
1611 void transmit_spool(int sock, char *remote_nodename)
1612 {
1613         char buf[SIZ];
1614         char pbuf[4096];
1615         long plen;
1616         long bytes_to_write, thisblock, bytes_written;
1617         int fd;
1618         char sfname[128];
1619
1620         if (sock_puts(sock, "NUOP") < 0) return;
1621         if (sock_gets(sock, buf) < 0) return;
1622         lprintf(CTDL_DEBUG, "<%s\n", buf);
1623         if (buf[0] != '2') {
1624                 return;
1625         }
1626
1627         snprintf(sfname, sizeof sfname, "./network/spoolout/%s", remote_nodename);
1628         fd = open(sfname, O_RDONLY);
1629         if (fd < 0) {
1630                 if (errno != ENOENT) {
1631                         lprintf(CTDL_CRIT, "cannot open upload file locally: %s\n",
1632                                 strerror(errno));
1633                 }
1634                 return;
1635         }
1636         bytes_written = 0;
1637         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
1638                 bytes_to_write = plen;
1639                 while (bytes_to_write > 0L) {
1640                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
1641                         if (sock_puts(sock, buf) < 0) {
1642                                 close(fd);
1643                                 return;
1644                         }
1645                         if (sock_gets(sock, buf) < 0) {
1646                                 close(fd);
1647                                 return;
1648                         }
1649                         thisblock = atol(&buf[4]);
1650                         if (buf[0] == '7') {
1651                                 if (sock_write(sock, pbuf,
1652                                    (int) thisblock) < 0) {
1653                                         close(fd);
1654                                         return;
1655                                 }
1656                                 bytes_to_write -= thisblock;
1657                                 bytes_written += thisblock;
1658                         } else {
1659                                 goto ABORTUPL;
1660                         }
1661                 }
1662         }
1663
1664 ABORTUPL:
1665         close(fd);
1666         if (sock_puts(sock, "UCLS 1") < 0) return;
1667         if (sock_gets(sock, buf) < 0) return;
1668         lprintf(CTDL_NOTICE, "Sent %ld octets to <%s>",
1669                         bytes_written, remote_nodename);
1670         lprintf(CTDL_DEBUG, "<%s\n", buf);
1671         if (buf[0] == '2') {
1672                 unlink(sfname);
1673         }
1674 }
1675
1676
1677
1678 /*
1679  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
1680  */
1681 void network_poll_node(char *node, char *secret, char *host, char *port) {
1682         int sock;
1683         char buf[SIZ];
1684
1685         if (network_talking_to(node, NTT_CHECK)) return;
1686         network_talking_to(node, NTT_ADD);
1687         lprintf(CTDL_NOTICE, "Connecting to <%s> at %s:%s\n", node, host, port);
1688
1689         sock = sock_connect(host, port, "tcp");
1690         if (sock < 0) {
1691                 lprintf(CTDL_ERR, "Could not connect: %s\n", strerror(errno));
1692                 network_talking_to(node, NTT_REMOVE);
1693                 return;
1694         }
1695
1696         lprintf(CTDL_DEBUG, "Connected!\n");
1697
1698         /* Read the server greeting */
1699         if (sock_gets(sock, buf) < 0) goto bail;
1700         lprintf(CTDL_DEBUG, ">%s\n", buf);
1701
1702         /* Identify ourselves */
1703         snprintf(buf, sizeof buf, "NETP %s|%s", config.c_nodename, secret);
1704         lprintf(CTDL_DEBUG, "<%s\n", buf);
1705         if (sock_puts(sock, buf) <0) goto bail;
1706         if (sock_gets(sock, buf) < 0) goto bail;
1707         lprintf(CTDL_DEBUG, ">%s\n", buf);
1708         if (buf[0] != '2') goto bail;
1709
1710         /* At this point we are authenticated. */
1711         receive_spool(sock, node);
1712         transmit_spool(sock, node);
1713
1714         sock_puts(sock, "QUIT");
1715 bail:   sock_close(sock);
1716         network_talking_to(node, NTT_REMOVE);
1717 }
1718
1719
1720
1721 /*
1722  * Poll other Citadel nodes and transfer inbound/outbound network data.
1723  * Set "full" to nonzero to force a poll of every node, or to zero to poll
1724  * only nodes to which we have data to send.
1725  */
1726 void network_poll_other_citadel_nodes(int full_poll) {
1727         int i;
1728         char linebuf[SIZ];
1729         char node[SIZ];
1730         char host[SIZ];
1731         char port[SIZ];
1732         char secret[SIZ];
1733         int poll = 0;
1734         char spoolfile[SIZ];
1735
1736         if (working_ignetcfg == NULL) {
1737                 lprintf(CTDL_DEBUG, "No nodes defined - not polling\n");
1738                 return;
1739         }
1740
1741         /* Use the string tokenizer to grab one line at a time */
1742         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
1743                 extract_token(linebuf, working_ignetcfg, i, '\n');
1744                 extract(node, linebuf, 0);
1745                 extract(secret, linebuf, 1);
1746                 extract(host, linebuf, 2);
1747                 extract(port, linebuf, 3);
1748                 if ( (strlen(node) > 0) && (strlen(secret) > 0)
1749                    && (strlen(host) > 0) && strlen(port) > 0) {
1750                         poll = full_poll;
1751                         if (poll == 0) {
1752                                 sprintf(spoolfile, "./network/spoolout/%s",
1753                                         node);
1754                                 if (access(spoolfile, R_OK) == 0) {
1755                                         poll = 1;
1756                                 }
1757                         }
1758                         if (poll) {
1759                                 network_poll_node(node, secret, host, port);
1760                         }
1761                 }
1762         }
1763
1764 }
1765
1766
1767
1768
1769
1770
1771
1772 /*
1773  * network_do_queue()
1774  *
1775  * Run through the rooms doing various types of network stuff.
1776  */
1777 void network_do_queue(void) {
1778         static time_t last_run = 0L;
1779         struct RoomProcList *ptr;
1780         int full_processing = 1;
1781
1782         /*
1783          * Run the full set of processing tasks no more frequently
1784          * than once every n seconds
1785          */
1786         if ( (time(NULL) - last_run) < config.c_net_freq ) {
1787                 full_processing = 0;
1788         }
1789
1790         /*
1791          * This is a simple concurrency check to make sure only one queue run
1792          * is done at a time.  We could do this with a mutex, but since we
1793          * don't really require extremely fine granularity here, we'll do it
1794          * with a static variable instead.
1795          */
1796         if (doing_queue) return;
1797         doing_queue = 1;
1798
1799         /* Load the IGnet Configuration into memory */
1800         load_working_ignetcfg();
1801
1802         /*
1803          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
1804          * then we poll everyone.  Otherwise we only poll nodes we have stuff
1805          * to send to.
1806          */
1807         network_poll_other_citadel_nodes(full_processing);
1808
1809         /*
1810          * Load the network map and filter list into memory.
1811          */
1812         read_network_map();
1813         filterlist = load_filter_list();
1814
1815         /*
1816          * Go ahead and run the queue
1817          */
1818         if (full_processing) {
1819                 lprintf(CTDL_DEBUG, "network: loading outbound queue\n");
1820                 ForEachRoom(network_queue_room, NULL);
1821
1822                 lprintf(CTDL_DEBUG, "network: running outbound queue\n");
1823                 while (rplist != NULL) {
1824                         network_spoolout_room(rplist->name);
1825                         ptr = rplist;
1826                         rplist = rplist->next;
1827                         free(ptr);
1828                 }
1829         }
1830
1831         lprintf(CTDL_DEBUG, "network: processing inbound queue\n");
1832         network_do_spoolin();
1833
1834         /* Save the network map back to disk */
1835         write_network_map();
1836
1837         /* Free the filter list in memory */
1838         free_filter_list(filterlist);
1839         filterlist = NULL;
1840
1841         network_purge_spoolout();
1842
1843         lprintf(CTDL_DEBUG, "network: queue run completed\n");
1844
1845         if (full_processing) {
1846                 last_run = time(NULL);
1847         }
1848
1849         doing_queue = 0;
1850 }
1851
1852
1853 /*
1854  * cmd_netp() - authenticate to the server as another Citadel node polling
1855  *              for network traffic
1856  */
1857 void cmd_netp(char *cmdbuf)
1858 {
1859         char node[SIZ];
1860         char pass[SIZ];
1861         int v;
1862
1863         char secret[SIZ];
1864         char nexthop[SIZ];
1865
1866         /* Authenticate */
1867         extract(node, cmdbuf, 0);
1868         extract(pass, cmdbuf, 1);
1869
1870         if (doing_queue) {
1871                 lprintf(CTDL_WARNING, "Network node <%s> refused - spooling", node);
1872                 cprintf("%d spooling - try again in a few minutes\n",
1873                         ERROR + RESOURCE_BUSY);
1874                 return;
1875         }
1876
1877         /* load the IGnet Configuration to check node validity */
1878         load_working_ignetcfg();
1879         v = is_valid_node(nexthop, secret, node);
1880
1881         if (v != 0) {
1882                 lprintf(CTDL_WARNING, "Unknown node <%s>", node);
1883                 cprintf("%d authentication failed\n",
1884                         ERROR + PASSWORD_REQUIRED);
1885                 return;
1886         }
1887
1888         if (strcasecmp(pass, secret)) {
1889                 lprintf(CTDL_WARNING, "Bad password for network node <%s>", node);
1890                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
1891                 return;
1892         }
1893
1894         if (network_talking_to(node, NTT_CHECK)) {
1895                 lprintf(CTDL_WARNING, "Duplicate session for network node <%s>", node);
1896                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
1897                 return;
1898         }
1899
1900         safestrncpy(CC->net_node, node, sizeof CC->net_node);
1901         network_talking_to(node, NTT_ADD);
1902         lprintf(CTDL_NOTICE, "Network node <%s> logged in\n", CC->net_node);
1903         cprintf("%d authenticated as network node '%s'\n", CIT_OK,
1904                 CC->net_node);
1905 }
1906
1907
1908
1909 /*
1910  * Module entry point
1911  */
1912 char *serv_network_init(void)
1913 {
1914         CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
1915         CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
1916         CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
1917         CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
1918         CtdlRegisterSessionHook(network_do_queue, EVT_TIMER);
1919         return "$Id$";
1920 }