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) 2000-2001 by Art Cancro and others.
   8  * This code is released under the terms of the GNU General Public License.
   9  *
  10  */
  11
  12 /*
  13  * FIXME
  14  * Don't allow polls during network processing
  15  */
  16
  17 #include "sysdep.h"
  18 #include <stdlib.h>
  19 #include <unistd.h>
  20 #include <stdio.h>
  21 #include <fcntl.h>
  22 #include <signal.h>
  23 #include <pwd.h>
  24 #include <errno.h>
  25 #include <sys/types.h>
  26 #include <dirent.h>
  27 #if TIME_WITH_SYS_TIME
  28 # include <sys/time.h>
  29 # include <time.h>
  30 #else
  31 # if HAVE_SYS_TIME_H
  32 #  include <sys/time.h>
  33 # else
  34 #  include <time.h>
  35 # endif
  36 #endif
  37
  38 #include <sys/wait.h>
  39 #include <string.h>
  40 #include <limits.h>
  41 #include "citadel.h"
  42 #include "server.h"
  43 #include "sysdep_decls.h"
  44 #include "citserver.h"
  45 #include "support.h"
  46 #include "config.h"
  47 #include "dynloader.h"
  48 #include "room_ops.h"
  49 #include "user_ops.h"
  50 #include "policy.h"
  51 #include "database.h"
  52 #include "msgbase.h"
  53 #include "tools.h"
  54 #include "internet_addressing.h"
  55 #include "serv_network.h"
  56 #include "clientsocket.h"
  57 #include "file_ops.h"
  58
  59
  60 /*
  61  * When we do network processing, it's accomplished in two passes; one to
  62  * gather a list of rooms and one to actually do them.  It's ok that rplist
  63  * is global; this process *only* runs as part of the housekeeping loop and
  64  * therefore only one will run at a time.
  65  */
  66 struct RoomProcList *rplist = NULL;
  67
  68 /*
  69  * We build a map of network nodes during processing.
  70  */
  71 struct NetMap *the_netmap = NULL;
  72
  73
  74
  75
  76
  77
  78 /*
  79  * Manage the use table.  This is a list of messages which have recently
  80  * arrived on the system.  It is maintained and queried to prevent the same
  81  * message from being entered into the  FIXME not finished
  82  */
  83 int network_usetable(int operation, struct CtdlMessage *msg) {
  84
  85         static struct UseTable *ut = NULL;
  86         struct UseTable *uptr = NULL;
  87
  88         switch(operation) {
  89
  90                 case UT_LOAD:
  91                         return(1);
  92                         break;
  93
  94                 case UT_SAVE:
  95                         return(1);
  96                         break;
  97
  98                 case UT_INSERT:
  99                         return(1);
 100                         break;
 101
 102         }
 103
 104         /* should never get here unless illegal operation specified */
 105         return(2);
 106 }
 107
 108
 109 /*
 110  * Read the network map from its configuration file into memory.
 111  */
 112 void read_network_map(void) {
 113         char *serialized_map = NULL;
 114         int i;
 115         char buf[SIZ];
 116         struct NetMap *nmptr;
 117
 118         serialized_map = CtdlGetSysConfig(IGNETMAP);
 119         if (serialized_map == NULL) return;     /* 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_map, '\n'); ++i) {
 123                 extract_token(buf, serialized_map, i, '\n');
 124                 nmptr = (struct NetMap *) mallok(sizeof(struct NetMap));
 125                 extract(nmptr->nodename, buf, 0);
 126                 nmptr->lastcontact = extract_long(buf, 1);
 127                 extract(nmptr->nexthop, buf, 2);
 128                 nmptr->next = the_netmap;
 129                 the_netmap = nmptr;
 130         }
 131
 132         phree(serialized_map);
 133 }
 134
 135
 136 /*
 137  * Write the network map from memory back to the configuration file.
 138  */
 139 void write_network_map(void) {
 140         char *serialized_map = NULL;
 141         struct NetMap *nmptr;
 142
 143         serialized_map = strdoop("");
 144
 145         if (the_netmap != NULL) {
 146                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 147                         serialized_map = reallok(serialized_map,
 148                                                 (strlen(serialized_map)+SIZ) );
 149                         if (strlen(nmptr->nodename) > 0) {
 150                                 sprintf(&serialized_map[strlen(serialized_map)],
 151                                         "%s|%ld|%s\n",
 152                                         nmptr->nodename,
 153                                         nmptr->lastcontact,
 154                                         nmptr->nexthop);
 155                         }
 156                 }
 157         }
 158
 159         CtdlPutSysConfig(IGNETMAP, serialized_map);
 160         phree(serialized_map);
 161
 162         /* Now free the list */
 163         while (the_netmap != NULL) {
 164                 nmptr = the_netmap->next;
 165                 phree(the_netmap);
 166                 the_netmap = nmptr;
 167         }
 168 }
 169
 170
 171
 172 /*
 173  * Check the network map and determine whether the supplied node name is
 174  * valid.  If it is not a neighbor node, supply the name of a neighbor node
 175  * which is the next hop.  If it *is* a neighbor node, we also fill in the
 176  * shared secret.
 177  */
 178 int is_valid_node(char *nexthop, char *secret, char *node) {
 179         char *ignetcfg = NULL;
 180         int i;
 181         char linebuf[SIZ];
 182         char buf[SIZ];
 183         int retval;
 184         struct NetMap *nmptr;
 185
 186         if (node == NULL) {
 187                 return(-1);
 188         }
 189
 190         /*
 191          * First try the neighbor nodes
 192          */
 193         ignetcfg = CtdlGetSysConfig(IGNETCFG);
 194         if (ignetcfg == NULL) {
 195                 if (nexthop != NULL) {
 196                         strcpy(nexthop, "");
 197                 }
 198                 return(-1);
 199         }
 200
 201         retval = (-1);
 202         if (nexthop != NULL) {
 203                 strcpy(nexthop, "");
 204         }
 205
 206         /* Use the string tokenizer to grab one line at a time */
 207         for (i=0; i<num_tokens(ignetcfg, '\n'); ++i) {
 208                 extract_token(linebuf, ignetcfg, i, '\n');
 209                 extract(buf, linebuf, 0);
 210                 if (!strcasecmp(buf, node)) {
 211                         if (nexthop != NULL) {
 212                                 strcpy(nexthop, "");
 213                         }
 214                         if (secret != NULL) {
 215                                 extract(secret, linebuf, 1);
 216                         }
 217                         retval = 0;
 218                 }
 219         }
 220
 221         phree(ignetcfg);
 222         if (retval == 0) {
 223                 return(retval);         /* yup, it's a direct neighbor */
 224         }
 225
 226         /*
 227          * If we get to this point we have to see if we know the next hop
 228          */
 229         if (the_netmap != NULL) {
 230                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 231                         if (!strcasecmp(nmptr->nodename, node)) {
 232                                 if (nexthop != NULL) {
 233                                         strcpy(nexthop, nmptr->nexthop);
 234                                 }
 235                                 return(0);
 236                         }
 237                 }
 238         }
 239
 240         /*
 241          * If we get to this point, the supplied node name is bogus.
 242          */
 243         lprintf(5, "Invalid node name <%s>\n", node);
 244         return(-1);
 245 }
 246
 247
 248
 249
 250
 251 void cmd_gnet(char *argbuf) {
 252         char filename[SIZ];
 253         char buf[SIZ];
 254         FILE *fp;
 255
 256         if (CtdlAccessCheck(ac_room_aide)) return;
 257         assoc_file_name(filename, &CC->quickroom, "netconfigs");
 258         cprintf("%d Network settings for room #%ld <%s>\n",
 259                 LISTING_FOLLOWS,
 260                 CC->quickroom.QRnumber, CC->quickroom.QRname);
 261
 262         fp = fopen(filename, "r");
 263         if (fp != NULL) {
 264                 while (fgets(buf, sizeof buf, fp) != NULL) {
 265                         buf[strlen(buf)-1] = 0;
 266                         cprintf("%s\n", buf);
 267                 }
 268                 fclose(fp);
 269         }
 270
 271         cprintf("000\n");
 272 }
 273
 274
 275 void cmd_snet(char *argbuf) {
 276         char tempfilename[SIZ];
 277         char filename[SIZ];
 278         char buf[SIZ];
 279         FILE *fp;
 280
 281         if (CtdlAccessCheck(ac_room_aide)) return;
 282         safestrncpy(tempfilename, tmpnam(NULL), sizeof tempfilename);
 283         assoc_file_name(filename, &CC->quickroom, "netconfigs");
 284
 285         fp = fopen(tempfilename, "w");
 286         if (fp == NULL) {
 287                 cprintf("%d Cannot open %s: %s\n",
 288                         ERROR+INTERNAL_ERROR,
 289                         tempfilename,
 290                         strerror(errno));
 291         }
 292
 293         cprintf("%d %s\n", SEND_LISTING, tempfilename);
 294         while (client_gets(buf), strcmp(buf, "000")) {
 295                 fprintf(fp, "%s\n", buf);
 296         }
 297         fclose(fp);
 298
 299         /* Now copy the temp file to its permanent location
 300          * (We use /bin/mv instead of link() because they may be on
 301          * different filesystems)
 302          */
 303         unlink(filename);
 304         snprintf(buf, sizeof buf, "/bin/mv %s %s", tempfilename, filename);
 305         system(buf);
 306 }
 307
 308
 309
 310 /*
 311  * Spools out one message from the list.
 312  */
 313 void network_spool_msg(long msgnum, void *userdata) {
 314         struct SpoolControl *sc;
 315         struct namelist *nptr;
 316         int err;
 317         int i;
 318         char *instr = NULL;
 319         char *newpath = NULL;
 320         size_t instr_len = SIZ;
 321         struct CtdlMessage *msg = NULL;
 322         struct CtdlMessage *imsg;
 323         struct ser_ret sermsg;
 324         FILE *fp;
 325         char filename[SIZ];
 326         char buf[SIZ];
 327         int bang = 0;
 328         int send = 1;
 329         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 330
 331         sc = (struct SpoolControl *)userdata;
 332
 333         /*
 334          * Process mailing list recipients
 335          */
 336         if (sc->listrecps != NULL) {
 337
 338                 /* First, copy it to the spoolout room */
 339                 err = CtdlSaveMsgPointerInRoom(SMTP_SPOOLOUT_ROOM, msgnum, 0);
 340                 if (err != 0) return;
 341
 342                 /*
 343                  * Figure out how big a buffer we need to allocate
 344                  */
 345                 for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 346                         instr_len = instr_len + strlen(nptr->name);
 347                 }
 348
 349                 /*
 350                  * allocate...
 351                  */
 352                 lprintf(9, "Generating delivery instructions\n");
 353                 instr = mallok(instr_len);
 354                 if (instr == NULL) {
 355                         lprintf(1, "Cannot allocate %d bytes for instr...\n",
 356                                 instr_len);
 357                         abort();
 358                 }
 359                 sprintf(instr,
 360                         "Content-type: %s\n\nmsgid|%ld\nsubmitted|%ld\n"
 361                         "bounceto|postmaster@%s\n" ,
 362                         SPOOLMIME, msgnum, time(NULL), config.c_fqdn );
 363
 364                 /* Generate delivery instructions for each recipient */
 365                 for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 366                         sprintf(&instr[strlen(instr)], "remote|%s|0||\n",
 367                                 nptr->name);
 368                 }
 369
 370                 /*
 371                  * Generate a message from the instructions
 372                  */
 373                 imsg = mallok(sizeof(struct CtdlMessage));
 374                 memset(imsg, 0, sizeof(struct CtdlMessage));
 375                 imsg->cm_magic = CTDLMESSAGE_MAGIC;
 376                 imsg->cm_anon_type = MES_NORMAL;
 377                 imsg->cm_format_type = FMT_RFC822;
 378                 imsg->cm_fields['A'] = strdoop("Citadel");
 379                 imsg->cm_fields['M'] = instr;
 380
 381                 /* Save delivery instructions in spoolout room */
 382                 CtdlSaveMsg(imsg, "", SMTP_SPOOLOUT_ROOM, MES_LOCAL);
 383                 CtdlFreeMessage(imsg);
 384         }
 385
 386         /*
 387          * Process IGnet push shares
 388          */
 389         if (sc->ignet_push_shares != NULL) {
 390
 391                 msg = CtdlFetchMessage(msgnum);
 392                 if (msg != NULL) {
 393
 394                         /* Prepend our node name to the Path field whenever
 395                          * sending a message to another IGnet node
 396                          */
 397                         if (msg->cm_fields['P'] == NULL) {
 398                                 msg->cm_fields['P'] = strdoop("username");
 399                         }
 400                         newpath = mallok(strlen(msg->cm_fields['P']) +
 401                                         strlen(config.c_nodename) + 2);
 402                         sprintf(newpath, "%s!%s", config.c_nodename,
 403                                         msg->cm_fields['P']);
 404                         phree(msg->cm_fields['P']);
 405                         msg->cm_fields['P'] = newpath;
 406
 407                         /*
 408                          * Force the message to appear in the correct room
 409                          * on the far end by setting the C field correctly
 410                          */
 411                         if (msg->cm_fields['C'] != NULL) {
 412                                 phree(msg->cm_fields['C']);
 413                         }
 414                         msg->cm_fields['C'] = strdoop(CC->quickroom.QRname);
 415
 416                         /*
 417                          * Determine if this message is set to be deleted
 418                          * after sending out on the network
 419                          */
 420                         if (msg->cm_fields['S'] != NULL) {
 421                                 if (!strcasecmp(msg->cm_fields['S'],
 422                                    "CANCEL")) {
 423                                         delete_after_send = 1;
 424                                 }
 425                         }
 426
 427                         /*
 428                          * Now serialize it for transmission
 429                          */
 430                         serialize_message(&sermsg, msg);
 431
 432                         /* Now send it to every node */
 433                         for (nptr = sc->ignet_push_shares; nptr != NULL;
 434                             nptr = nptr->next) {
 435
 436                                 send = 1;
 437
 438                                 /* Check for valid node name */
 439                                 if (is_valid_node(NULL,NULL,nptr->name) != 0) {
 440                                         lprintf(3, "Invalid node <%s>\n",
 441                                                 nptr->name);
 442                                         send = 0;
 443                                 }
 444
 445                                 /* Check for split horizon */
 446                                 lprintf(9, "Path is %s\n", msg->cm_fields['P']);
 447                                 bang = num_tokens(msg->cm_fields['P'], '!');
 448                                 if (bang > 1) for (i=0; i<(bang-1); ++i) {
 449                                         extract_token(buf, msg->cm_fields['P'],
 450                                                 i, '!');
 451                                         if (!strcasecmp(buf, nptr->name)) {
 452                                                 send = 0;
 453                                         }
 454                                 }
 455
 456                                 /* Send the message */
 457                                 if (send == 1) {
 458                                         sprintf(filename,
 459                                                 "./network/spoolout/%s",
 460                                                 nptr->name);
 461                                         fp = fopen(filename, "ab");
 462                                         if (fp != NULL) {
 463                                                 fwrite(sermsg.ser,
 464                                                         sermsg.len, 1, fp);
 465                                                 fclose(fp);
 466                                         }
 467                                 }
 468                         }
 469                         phree(sermsg.ser);
 470                         CtdlFreeMessage(msg);
 471                 }
 472         }
 473
 474         /* update lastsent */
 475         sc->lastsent = msgnum;
 476
 477         /* Delete this message if delete-after-send is set */
 478         if (delete_after_send) {
 479                 CtdlDeleteMessages(CC->quickroom.QRname, msgnum, "");
 480         }
 481
 482 }
 483
 484
 485
 486
 487 /*
 488  * Batch up and send all outbound traffic from the current room
 489  */
 490 void network_spoolout_room(char *room_to_spool) {
 491         char filename[SIZ];
 492         char buf[SIZ];
 493         char instr[SIZ];
 494         FILE *fp;
 495         struct SpoolControl sc;
 496         /* struct namelist *digestrecps = NULL; */
 497         struct namelist *nptr;
 498
 499         lprintf(7, "Spooling <%s>\n", room_to_spool);
 500         if (getroom(&CC->quickroom, room_to_spool) != 0) {
 501                 lprintf(1, "ERROR: cannot load <%s>\n", room_to_spool);
 502                 return;
 503         }
 504
 505         memset(&sc, 0, sizeof(struct SpoolControl));
 506         assoc_file_name(filename, &CC->quickroom, "netconfigs");
 507
 508         fp = fopen(filename, "r");
 509         if (fp == NULL) {
 510                 lprintf(7, "Outbound batch processing skipped for <%s>\n",
 511                         CC->quickroom.QRname);
 512                 return;
 513         }
 514
 515         lprintf(5, "Outbound batch processing started for <%s>\n",
 516                 CC->quickroom.QRname);
 517
 518         while (fgets(buf, sizeof buf, fp) != NULL) {
 519                 buf[strlen(buf)-1] = 0;
 520
 521                 extract(instr, buf, 0);
 522                 if (!strcasecmp(instr, "lastsent")) {
 523                         sc.lastsent = extract_long(buf, 1);
 524                 }
 525                 else if (!strcasecmp(instr, "listrecp")) {
 526                         nptr = (struct namelist *)
 527                                 mallok(sizeof(struct namelist));
 528                         nptr->next = sc.listrecps;
 529                         extract(nptr->name, buf, 1);
 530                         sc.listrecps = nptr;
 531                 }
 532                 else if (!strcasecmp(instr, "ignet_push_share")) {
 533                         nptr = (struct namelist *)
 534                                 mallok(sizeof(struct namelist));
 535                         nptr->next = sc.ignet_push_shares;
 536                         extract(nptr->name, buf, 1);
 537                         sc.ignet_push_shares = nptr;
 538                 }
 539
 540
 541         }
 542         fclose(fp);
 543
 544
 545         /* Do something useful */
 546         CtdlForEachMessage(MSGS_GT, sc.lastsent, (-63), NULL, NULL,
 547                 network_spool_msg, &sc);
 548
 549
 550         /* Now rewrite the config file */
 551         fp = fopen(filename, "w");
 552         if (fp == NULL) {
 553                 lprintf(1, "ERROR: cannot open %s: %s\n",
 554                         filename, strerror(errno));
 555         }
 556         else {
 557                 fprintf(fp, "lastsent|%ld\n", sc.lastsent);
 558
 559                 /* Write out the listrecps while freeing from memory at the
 560                  * same time.  Am I clever or what?  :)
 561                  */
 562                 while (sc.listrecps != NULL) {
 563                         fprintf(fp, "listrecp|%s\n", sc.listrecps->name);
 564                         nptr = sc.listrecps->next;
 565                         phree(sc.listrecps);
 566                         sc.listrecps = nptr;
 567                 }
 568                 while (sc.ignet_push_shares != NULL) {
 569                         fprintf(fp, "ignet_push_share|%s\n",
 570                                 sc.ignet_push_shares->name);
 571                         nptr = sc.ignet_push_shares->next;
 572                         phree(sc.ignet_push_shares);
 573                         sc.ignet_push_shares = nptr;
 574                 }
 575
 576                 fclose(fp);
 577         }
 578
 579         lprintf(5, "Outbound batch processing finished for <%s>\n",
 580                 CC->quickroom.QRname);
 581 }
 582
 583
 584 /*
 585  * Batch up and send all outbound traffic from the current room
 586  */
 587 void network_queue_room(struct quickroom *qrbuf, void *data) {
 588         struct RoomProcList *ptr;
 589
 590         ptr = (struct RoomProcList *) mallok(sizeof (struct RoomProcList));
 591         if (ptr == NULL) return;
 592
 593         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
 594         ptr->next = rplist;
 595         rplist = ptr;
 596 }
 597
 598
 599 /*
 600  * Learn topology from path fields
 601  */
 602 void network_learn_topology(char *node, char *path) {
 603         char nexthop[SIZ];
 604         struct NetMap *nmptr;
 605
 606         strcpy(nexthop, "");
 607
 608         if (num_tokens(path, '!') < 3) return;
 609         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 610                 if (!strcasecmp(nmptr->nodename, node)) {
 611                         extract_token(nmptr->nexthop, path, 0, '!');
 612                         nmptr->lastcontact = time(NULL);
 613                         return;
 614                 }
 615         }
 616
 617         /* If we got here then it's not in the map, so add it. */
 618         nmptr = (struct NetMap *) mallok(sizeof (struct NetMap));
 619         strcpy(nmptr->nodename, node);
 620         nmptr->lastcontact = time(NULL);
 621         extract_token(nmptr->nexthop, path, 0, '!');
 622         nmptr->next = the_netmap;
 623         the_netmap = nmptr;
 624 }
 625
 626
 627
 628
 629 /*
 630  * Bounce a message back to the sender
 631  */
 632 void network_bounce(struct CtdlMessage *msg, char *reason) {
 633         static int serialnum = 0;
 634         FILE *fp;
 635         char filename[SIZ];
 636         struct ser_ret sermsg;
 637         char *oldpath = NULL;
 638         char buf[SIZ];
 639
 640         lprintf(9, "entering network_bounce()\n");
 641
 642         if (msg == NULL) return;
 643
 644         /*
 645          * Give it a fresh message ID
 646          */
 647         if (msg->cm_fields['I'] != NULL) {
 648                 phree(msg->cm_fields['I']);
 649         }
 650         sprintf(buf, "%ld.%04x.%04x@%s",
 651                 time(NULL), getpid(), ++serialnum, config.c_fqdn);
 652         msg->cm_fields['I'] = strdoop(buf);
 653
 654         /*
 655          * FIXME ... right now we're just sending a bounce; we really want to
 656          * include the text of the bounced message.
 657          */
 658         if (msg->cm_fields['M'] != NULL) {
 659                 phree(msg->cm_fields['M']);
 660         }
 661         msg->cm_fields['M'] = strdoop(reason);
 662         msg->cm_format_type = 0;
 663
 664         /*
 665          * Turn the message around
 666          */
 667         if (msg->cm_fields['R'] == NULL) {
 668                 phree(msg->cm_fields['R']);
 669         }
 670
 671         if (msg->cm_fields['D'] == NULL) {
 672                 phree(msg->cm_fields['D']);
 673         }
 674
 675         msg->cm_fields['R'] = msg->cm_fields['A'];
 676         msg->cm_fields['D'] = msg->cm_fields['N'];
 677         msg->cm_fields['A'] = strdoop(BOUNCESOURCE);
 678         msg->cm_fields['N'] = strdoop(config.c_nodename);
 679
 680         if (!strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
 681                 phree(msg->cm_fields['D']);
 682         }
 683
 684         /*
 685          * If this is a bounce of a bounce, send it to the Aide> room
 686          * instead of looping around forever
 687          */
 688         if (msg->cm_fields['D'] == NULL) if (msg->cm_fields['R'] != NULL)
 689            if (!strcasecmp(msg->cm_fields['R'], BOUNCESOURCE)) {
 690                 phree(msg->cm_fields['R']);
 691                 if (msg->cm_fields['C'] != NULL) {
 692                         phree(msg->cm_fields['C']);
 693                 }
 694                 msg->cm_fields['C'] = strdoop(AIDEROOM);
 695         }
 696
 697         /* prepend our node to the path */
 698         if (msg->cm_fields['P'] != NULL) {
 699                 oldpath = msg->cm_fields['P'];
 700                 msg->cm_fields['P'] = NULL;
 701         }
 702         else {
 703                 oldpath = strdoop("unknown_user");
 704         }
 705         msg->cm_fields['P'] = mallok(strlen(oldpath) + SIZ);
 706         sprintf(msg->cm_fields['P'], "%s!%s", config.c_nodename, oldpath);
 707         phree(oldpath);
 708
 709         /* serialize the message */
 710         serialize_message(&sermsg, msg);
 711
 712         /* now send it */
 713         sprintf(filename, "./network/spoolin/bounce.%04x.%04x",
 714                 getpid(), serialnum);
 715
 716         fp = fopen(filename, "ab");
 717         if (fp != NULL) {
 718                 fwrite(sermsg.ser,
 719                         sermsg.len, 1, fp);
 720                 fclose(fp);
 721         }
 722         phree(sermsg.ser);
 723         CtdlFreeMessage(msg);
 724         lprintf(9, "leaving network_bounce()\n");
 725 }
 726
 727
 728
 729
 730 /*
 731  * Process a buffer containing a single message from a single file
 732  * from the inbound queue
 733  */
 734 void network_process_buffer(char *buffer, long size) {
 735         struct CtdlMessage *msg;
 736         long pos;
 737         int field;
 738         int a;
 739         int e = MES_LOCAL;
 740         struct usersupp tempUS;
 741         char recp[SIZ];
 742         char target_room[ROOMNAMELEN];
 743         struct ser_ret sermsg;
 744         char *oldpath = NULL;
 745         char filename[SIZ];
 746         FILE *fp;
 747
 748         /* Set default target room to trash */
 749         strcpy(target_room, TWITROOM);
 750
 751         /* Load the message into memory */
 752         msg = (struct CtdlMessage *) mallok(sizeof(struct CtdlMessage));
 753         memset(msg, 0, sizeof(struct CtdlMessage));
 754         msg->cm_magic = CTDLMESSAGE_MAGIC;
 755         msg->cm_anon_type = buffer[1];
 756         msg->cm_format_type = buffer[2];
 757
 758         for (pos = 3; pos < size; ++pos) {
 759                 field = buffer[pos];
 760                 msg->cm_fields[field] = strdoop(&buffer[pos+1]);
 761                 pos = pos + strlen(&buffer[(int)pos]);
 762         }
 763
 764         /* Check for message routing */
 765         if (msg->cm_fields['D'] != NULL) {
 766                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
 767
 768                         /* route the message */
 769                         if (is_valid_node(NULL, NULL,
 770                            msg->cm_fields['D']) == 0) {
 771
 772                                 /* prepend our node to the path */
 773                                 if (msg->cm_fields['P'] != NULL) {
 774                                         oldpath = msg->cm_fields['P'];
 775                                         msg->cm_fields['P'] = NULL;
 776                                 }
 777                                 else {
 778                                         oldpath = strdoop("unknown_user");
 779                                 }
 780                                 msg->cm_fields['P'] =
 781                                         mallok(strlen(oldpath) + SIZ);
 782                                 sprintf(msg->cm_fields['P'], "%s!%s",
 783                                         config.c_nodename, oldpath);
 784                                 phree(oldpath);
 785
 786                                 /* serialize the message */
 787                                 serialize_message(&sermsg, msg);
 788
 789                                 /* now send it */
 790                                 sprintf(filename,
 791                                         "./network/spoolout/%s",
 792                                         msg->cm_fields['D']);
 793                                 fp = fopen(filename, "ab");
 794                                 if (fp != NULL) {
 795                                         fwrite(sermsg.ser,
 796                                                 sermsg.len, 1, fp);
 797                                         fclose(fp);
 798                                 }
 799                                 phree(sermsg.ser);
 800                                 CtdlFreeMessage(msg);
 801                                 return;
 802                         }
 803
 804                         else {  /* invalid destination node name */
 805
 806                                 network_bounce(msg,
 807 "A message you sent could not be delivered due to an invalid destination node"
 808 " name.  Please check the address and try sending the message again.\n");
 809                                 msg = NULL;
 810                                 return;
 811
 812                         }
 813                 }
 814         }
 815
 816         /* FIXME check to see if we already have this message */
 817
 818         /* Learn network topology from the path */
 819         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
 820                 network_learn_topology(msg->cm_fields['N'],
 821                                         msg->cm_fields['P']);
 822         }
 823
 824         /* Does it have a recipient?  If so, validate it... */
 825         if (msg->cm_fields['R'] != NULL) {
 826
 827                 safestrncpy(recp, msg->cm_fields['R'], sizeof(recp));
 828
 829                 e = alias(recp);        /* alias and mail type */
 830                 if ((recp[0] == 0) || (e == MES_ERROR)) {
 831
 832                         network_bounce(msg,
 833 "A message you sent could not be delivered due to an invalid address.\n"
 834 "Please check the address and try sending the message again.\n");
 835                         msg = NULL;
 836                         return;
 837
 838                 }
 839                 else if (e == MES_LOCAL) {
 840                         a = getuser(&tempUS, recp);
 841                         if (a != 0) {
 842
 843                                 network_bounce(msg,
 844 "A message you sent could not be delivered because the user does not exist\n"
 845 "on this system.  Please check the address and try again.\n");
 846                                 msg = NULL;
 847                                 return;
 848
 849                         }
 850                         else {
 851                                 MailboxName(target_room, &tempUS, MAILROOM);
 852                         }
 853                 }
 854         }
 855
 856         else if (msg->cm_fields['C'] != NULL) {
 857                 safestrncpy(target_room,
 858                         msg->cm_fields['C'],
 859                         sizeof target_room);
 860         }
 861
 862         else if (msg->cm_fields['O'] != NULL) {
 863                 safestrncpy(target_room,
 864                         msg->cm_fields['O'],
 865                         sizeof target_room);
 866         }
 867
 868         /* save the message into a room */
 869         msg->cm_flags = CM_SKIP_HOOKS;
 870         CtdlSaveMsg(msg, "", target_room, 0);
 871         CtdlFreeMessage(msg);
 872 }
 873
 874
 875 /*
 876  * Process a single message from a single file from the inbound queue
 877  */
 878 void network_process_message(FILE *fp, long msgstart, long msgend) {
 879         long hold_pos;
 880         long size;
 881         char *buffer;
 882
 883         hold_pos = ftell(fp);
 884         size = msgend - msgstart + 1;
 885         buffer = mallok(size);
 886         if (buffer != NULL) {
 887                 fseek(fp, msgstart, SEEK_SET);
 888                 fread(buffer, size, 1, fp);
 889                 network_process_buffer(buffer, size);
 890                 phree(buffer);
 891         }
 892
 893         fseek(fp, hold_pos, SEEK_SET);
 894 }
 895
 896
 897 /*
 898  * Process a single file from the inbound queue
 899  */
 900 void network_process_file(char *filename) {
 901         FILE *fp;
 902         long msgstart = (-1L);
 903         long msgend = (-1L);
 904         long msgcur = 0L;
 905         int ch;
 906
 907         lprintf(7, "network: processing <%s>\n", filename);
 908
 909         fp = fopen(filename, "rb");
 910         if (fp == NULL) {
 911                 lprintf(5, "Error opening %s: %s\n",
 912                         filename, strerror(errno));
 913                 return;
 914         }
 915
 916         /* Look for messages in the data stream and break them out */
 917         while (ch = getc(fp), ch >= 0) {
 918
 919                 if (ch == 255) {
 920                         if (msgstart >= 0L) {
 921                                 msgend = msgcur - 1;
 922                                 network_process_message(fp, msgstart, msgend);
 923                         }
 924                         msgstart = msgcur;
 925                 }
 926
 927                 ++msgcur;
 928         }
 929
 930         msgend = msgcur - 1;
 931         if (msgstart >= 0L) {
 932                 network_process_message(fp, msgstart, msgend);
 933         }
 934
 935         fclose(fp);
 936         unlink(filename);
 937 }
 938
 939
 940 /*
 941  * Process anything in the inbound queue
 942  */
 943 void network_do_spoolin(void) {
 944         DIR *dp;
 945         struct dirent *d;
 946         char filename[SIZ];
 947
 948         dp = opendir("./network/spoolin");
 949         if (dp == NULL) return;
 950
 951         while (d = readdir(dp), d != NULL) {
 952                 sprintf(filename, "./network/spoolin/%s", d->d_name);
 953                 network_process_file(filename);
 954         }
 955
 956
 957         closedir(dp);
 958 }
 959
 960
 961
 962
 963
 964 /*
 965  * receive network spool from the remote system
 966  */
 967 void receive_spool(int sock, char *remote_nodename) {
 968         long download_len;
 969         long bytes_received;
 970         char buf[SIZ];
 971         static char pbuf[IGNET_PACKET_SIZE];
 972         char tempfilename[PATH_MAX];
 973         long plen;
 974         FILE *fp;
 975
 976         strcpy(tempfilename, tmpnam(NULL));
 977         if (sock_puts(sock, "NDOP") < 0) return;
 978         if (sock_gets(sock, buf) < 0) return;
 979         lprintf(9, "<%s\n", buf);
 980         if (buf[0] != '2') {
 981                 return;
 982         }
 983         download_len = extract_long(&buf[4], 0);
 984
 985         bytes_received = 0L;
 986         fp = fopen(tempfilename, "w");
 987         if (fp == NULL) {
 988                 lprintf(9, "cannot open download file locally: %s\n",
 989                         strerror(errno));
 990                 return;
 991         }
 992
 993         while (bytes_received < download_len) {
 994                 sprintf(buf, "READ %ld|%ld",
 995                         bytes_received,
 996                      ((download_len - bytes_received > IGNET_PACKET_SIZE)
 997                  ? IGNET_PACKET_SIZE : (download_len - bytes_received)));
 998                 if (sock_puts(sock, buf) < 0) {
 999                         fclose(fp);
1000                         unlink(tempfilename);
1001                         return;
1002                 }
1003                 if (sock_gets(sock, buf) < 0) {
1004                         fclose(fp);
1005                         unlink(tempfilename);
1006                         return;
1007                 }
1008                 if (buf[0] == '6') {
1009                         plen = extract_long(&buf[4], 0);
1010                         if (sock_read(sock, pbuf, plen) < 0) {
1011                                 fclose(fp);
1012                                 unlink(tempfilename);
1013                                 return;
1014                         }
1015                         fwrite((char *) pbuf, plen, 1, fp);
1016                         bytes_received = bytes_received + plen;
1017                 }
1018         }
1019
1020         fclose(fp);
1021         if (sock_puts(sock, "CLOS") < 0) {
1022                 unlink(tempfilename);
1023                 return;
1024         }
1025         if (sock_gets(sock, buf) < 0) {
1026                 unlink(tempfilename);
1027                 return;
1028         }
1029         lprintf(9, "%s\n", buf);
1030         sprintf(buf, "mv %s ./network/spoolin/%s.%ld",
1031                 tempfilename, remote_nodename, (long) getpid());
1032         system(buf);
1033 }
1034
1035
1036
1037 /*
1038  * transmit network spool to the remote system
1039  */
1040 void transmit_spool(int sock, char *remote_nodename)
1041 {
1042         char buf[SIZ];
1043         char pbuf[4096];
1044         long plen;
1045         long bytes_to_write, thisblock;
1046         int fd;
1047         char sfname[128];
1048
1049         if (sock_puts(sock, "NUOP") < 0) return;
1050         if (sock_gets(sock, buf) < 0) return;
1051         lprintf(9, "<%s\n", buf);
1052         if (buf[0] != '2') {
1053                 return;
1054         }
1055
1056         sprintf(sfname, "./network/spoolout/%s", remote_nodename);
1057         fd = open(sfname, O_RDONLY);
1058         if (fd < 0) {
1059                 if (errno == ENOENT) {
1060                         lprintf(9, "Nothing to send.\n");
1061                 } else {
1062                         lprintf(5, "cannot open upload file locally: %s\n",
1063                                 strerror(errno));
1064                 }
1065                 return;
1066         }
1067         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
1068                 bytes_to_write = plen;
1069                 while (bytes_to_write > 0L) {
1070                         sprintf(buf, "WRIT %ld", bytes_to_write);
1071                         if (sock_puts(sock, buf) < 0) {
1072                                 close(fd);
1073                                 return;
1074                         }
1075                         if (sock_gets(sock, buf) < 0) {
1076                                 close(fd);
1077                                 return;
1078                         }
1079                         thisblock = atol(&buf[4]);
1080                         if (buf[0] == '7') {
1081                                 if (sock_write(sock, pbuf,
1082                                    (int) thisblock) < 0) {
1083                                         close(fd);
1084                                         return;
1085                                 }
1086                                 bytes_to_write = bytes_to_write - thisblock;
1087                         } else {
1088                                 goto ABORTUPL;
1089                         }
1090                 }
1091         }
1092
1093 ABORTUPL:
1094         close(fd);
1095         if (sock_puts(sock, "UCLS 1") < 0) return;
1096         if (sock_gets(sock, buf) < 0) return;
1097         lprintf(9, "<%s\n", buf);
1098         if (buf[0] == '2') {
1099                 unlink(sfname);
1100         }
1101 }
1102
1103
1104
1105 /*
1106  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
1107  */
1108 void network_poll_node(char *node, char *secret, char *host, char *port) {
1109         int sock;
1110         char buf[SIZ];
1111
1112         if (network_talking_to(node, NTT_CHECK)) return;
1113         network_talking_to(node, NTT_ADD);
1114         lprintf(5, "Polling node <%s> at %s:%s\n", node, host, port);
1115
1116         sock = sock_connect(host, port, "tcp");
1117         if (sock < 0) {
1118                 lprintf(7, "Could not connect: %s\n", strerror(errno));
1119                 network_talking_to(node, NTT_REMOVE);
1120                 return;
1121         }
1122
1123         lprintf(9, "Connected!\n");
1124
1125         /* Read the server greeting */
1126         if (sock_gets(sock, buf) < 0) goto bail;
1127         lprintf(9, ">%s\n", buf);
1128
1129         /* Identify ourselves */
1130         sprintf(buf, "NETP %s|%s", config.c_nodename, secret);
1131         lprintf(9, "<%s\n", buf);
1132         if (sock_puts(sock, buf) <0) goto bail;
1133         if (sock_gets(sock, buf) < 0) goto bail;
1134         lprintf(9, ">%s\n", buf);
1135         if (buf[0] != '2') goto bail;
1136
1137         /* At this point we are authenticated. */
1138         receive_spool(sock, node);
1139         transmit_spool(sock, node);
1140
1141         sock_puts(sock, "QUIT");
1142 bail:   sock_close(sock);
1143         network_talking_to(node, NTT_REMOVE);
1144 }
1145
1146
1147
1148 /*
1149  * Poll other Citadel nodes and transfer inbound/outbound network data.
1150  */
1151 void network_poll_other_citadel_nodes(void) {
1152         char *ignetcfg = NULL;
1153         int i;
1154         char linebuf[SIZ];
1155         char node[SIZ];
1156         char host[SIZ];
1157         char port[SIZ];
1158         char secret[SIZ];
1159
1160         ignetcfg = CtdlGetSysConfig(IGNETCFG);
1161         if (ignetcfg == NULL) return;   /* no nodes defined */
1162
1163         /* Use the string tokenizer to grab one line at a time */
1164         for (i=0; i<num_tokens(ignetcfg, '\n'); ++i) {
1165                 extract_token(linebuf, ignetcfg, i, '\n');
1166                 extract(node, linebuf, 0);
1167                 extract(secret, linebuf, 1);
1168                 extract(host, linebuf, 2);
1169                 extract(port, linebuf, 3);
1170                 if ( (strlen(node) > 0) && (strlen(secret) > 0)
1171                    && (strlen(host) > 0) && strlen(port) > 0) {
1172                         network_poll_node(node, secret, host, port);
1173                 }
1174         }
1175
1176         phree(ignetcfg);
1177 }
1178
1179
1180
1181
1182
1183
1184
1185 /*
1186  * network_do_queue()
1187  *
1188  * Run through the rooms doing various types of network stuff.
1189  */
1190 void network_do_queue(void) {
1191         static int doing_queue = 0;
1192         static time_t last_run = 0L;
1193         struct RoomProcList *ptr;
1194
1195         /*
1196          * Run no more frequently than once every n seconds
1197          */
1198         if ( (time(NULL) - last_run) < NETWORK_QUEUE_FREQUENCY ) return;
1199
1200         /*
1201          * This is a simple concurrency check to make sure only one queue run
1202          * is done at a time.  We could do this with a mutex, but since we
1203          * don't really require extremely fine granularity here, we'll do it
1204          * with a static variable instead.
1205          */
1206         if (doing_queue) return;
1207         doing_queue = 1;
1208         last_run = time(NULL);
1209
1210         /*
1211          * Poll other Citadel nodes.
1212          */
1213         network_poll_other_citadel_nodes();
1214
1215         /*
1216          * Load the network map into memory.
1217          */
1218         read_network_map();
1219
1220         /*
1221          * Go ahead and run the queue
1222          */
1223         lprintf(7, "network: loading outbound queue\n");
1224         ForEachRoom(network_queue_room, NULL);
1225
1226         lprintf(7, "network: running outbound queue\n");
1227         while (rplist != NULL) {
1228                 network_spoolout_room(rplist->name);
1229                 ptr = rplist;
1230                 rplist = rplist->next;
1231                 phree(ptr);
1232         }
1233
1234         lprintf(7, "network: processing inbound queue\n");
1235         network_do_spoolin();
1236
1237         write_network_map();
1238
1239         lprintf(7, "network: queue run completed\n");
1240         doing_queue = 0;
1241 }
1242
1243
1244
1245 /*
1246  * cmd_netp() - authenticate to the server as another Citadel node polling
1247  *              for network traffic
1248  */
1249 void cmd_netp(char *cmdbuf)
1250 {
1251         char node[SIZ];
1252         char pass[SIZ];
1253
1254         char secret[SIZ];
1255         char nexthop[SIZ];
1256
1257         extract(node, cmdbuf, 0);
1258         extract(pass, cmdbuf, 1);
1259
1260         if (is_valid_node(nexthop, secret, node) != 0) {
1261                 cprintf("%d authentication failed\n", ERROR);
1262                 return;
1263         }
1264
1265         if (strcasecmp(pass, secret)) {
1266                 cprintf("%d authentication failed\n", ERROR);
1267                 return;
1268         }
1269
1270         if (network_talking_to(node, NTT_CHECK)) {
1271                 cprintf("%d Already talking to %s right now\n", ERROR);
1272                 return;
1273         }
1274
1275         safestrncpy(CC->net_node, node, sizeof CC->net_node);
1276         network_talking_to(node, NTT_ADD);
1277         cprintf("%d authenticated as network node '%s'\n", OK,
1278                 CC->net_node);
1279 }
1280
1281
1282
1283 /*
1284  * Module entry point
1285  */
1286 char *Dynamic_Module_Init(void)
1287 {
1288         CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
1289         CtdlRegisterProtoHook(cmd_snet, "SNET", "Get network config");
1290         CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
1291         CtdlRegisterSessionHook(network_do_queue, EVT_TIMER);
1292         return "$Id$";
1293 }