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  */
  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 #ifndef HAVE_SNPRINTF
  60 #include "snprintf.h"
  61 #endif
  62
  63
  64 /*
  65  * When we do network processing, it's accomplished in two passes; one to
  66  * gather a list of rooms and one to actually do them.  It's ok that rplist
  67  * is global; this process *only* runs as part of the housekeeping loop and
  68  * therefore only one will run at a time.
  69  */
  70 struct RoomProcList *rplist = NULL;
  71
  72 /*
  73  * We build a map of network nodes during processing.
  74  */
  75 struct NetMap *the_netmap = NULL;
  76
  77
  78 /*
  79  * Check 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 database multiple times if it happens
  82  * to arrive multiple times by accident.
  83  */
  84 int network_usetable(struct CtdlMessage *msg) {
  85
  86         char msgid[SIZ];
  87         struct cdbdata *cdbut;
  88         time_t timestamp;
  89
  90         /* Bail out if we can't generate a message ID */
  91         if (msg == NULL) {
  92                 return(0);
  93         }
  94         if (msg->cm_fields['I'] == NULL) {
  95                 return(0);
  96         }
  97         if (strlen(msg->cm_fields['I']) == 0) {
  98                 return(0);
  99         }
 100
 101         /* Generate the message ID */
 102         strcpy(msgid, msg->cm_fields['I']);
 103         if (haschar(msgid, '@') == 0) {
 104                 strcat(msgid, "@");
 105                 if (msg->cm_fields['N'] != NULL) {
 106                         strcat(msgid, msg->cm_fields['N']);
 107                 }
 108                 else {
 109                         return(0);
 110                 }
 111         }
 112
 113         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 114         if (cdbut != NULL) {
 115                 cdb_free(cdbut);
 116                 return(1);
 117         }
 118
 119         /* If we got to this point, it's unique: add it. */
 120         timestamp = time(NULL);
 121         cdb_store(CDB_USETABLE, msgid, strlen(msgid),
 122                 &timestamp, sizeof(timestamp) );
 123         return(0);
 124 }
 125
 126
 127 /*
 128  * Read the network map from its configuration file into memory.
 129  */
 130 void read_network_map(void) {
 131         char *serialized_map = NULL;
 132         int i;
 133         char buf[SIZ];
 134         struct NetMap *nmptr;
 135
 136         serialized_map = CtdlGetSysConfig(IGNETMAP);
 137         if (serialized_map == NULL) return;     /* if null, no entries */
 138
 139         /* Use the string tokenizer to grab one line at a time */
 140         for (i=0; i<num_tokens(serialized_map, '\n'); ++i) {
 141                 extract_token(buf, serialized_map, i, '\n');
 142                 nmptr = (struct NetMap *) mallok(sizeof(struct NetMap));
 143                 extract(nmptr->nodename, buf, 0);
 144                 nmptr->lastcontact = extract_long(buf, 1);
 145                 extract(nmptr->nexthop, buf, 2);
 146                 nmptr->next = the_netmap;
 147                 the_netmap = nmptr;
 148         }
 149
 150         phree(serialized_map);
 151 }
 152
 153
 154 /*
 155  * Write the network map from memory back to the configuration file.
 156  */
 157 void write_network_map(void) {
 158         char *serialized_map = NULL;
 159         struct NetMap *nmptr;
 160
 161         serialized_map = strdoop("");
 162
 163         if (the_netmap != NULL) {
 164                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 165                         serialized_map = reallok(serialized_map,
 166                                                 (strlen(serialized_map)+SIZ) );
 167                         if (strlen(nmptr->nodename) > 0) {
 168                                 sprintf(&serialized_map[strlen(serialized_map)],
 169                                         "%s|%ld|%s\n",
 170                                         nmptr->nodename,
 171                                         (long)nmptr->lastcontact,
 172                                         nmptr->nexthop);
 173                         }
 174                 }
 175         }
 176
 177         CtdlPutSysConfig(IGNETMAP, serialized_map);
 178         phree(serialized_map);
 179
 180         /* Now free the list */
 181         while (the_netmap != NULL) {
 182                 nmptr = the_netmap->next;
 183                 phree(the_netmap);
 184                 the_netmap = nmptr;
 185         }
 186 }
 187
 188
 189
 190 /*
 191  * Check the network map and determine whether the supplied node name is
 192  * valid.  If it is not a neighbor node, supply the name of a neighbor node
 193  * which is the next hop.  If it *is* a neighbor node, we also fill in the
 194  * shared secret.
 195  */
 196 int is_valid_node(char *nexthop, char *secret, char *node) {
 197         char *ignetcfg = NULL;
 198         int i;
 199         char linebuf[SIZ];
 200         char buf[SIZ];
 201         int retval;
 202         struct NetMap *nmptr;
 203
 204         if (node == NULL) {
 205                 return(-1);
 206         }
 207
 208         /*
 209          * First try the neighbor nodes
 210          */
 211         ignetcfg = CtdlGetSysConfig(IGNETCFG);
 212         if (ignetcfg == NULL) {
 213                 if (nexthop != NULL) {
 214                         strcpy(nexthop, "");
 215                 }
 216                 return(-1);
 217         }
 218
 219         retval = (-1);
 220         if (nexthop != NULL) {
 221                 strcpy(nexthop, "");
 222         }
 223
 224         /* Use the string tokenizer to grab one line at a time */
 225         for (i=0; i<num_tokens(ignetcfg, '\n'); ++i) {
 226                 extract_token(linebuf, ignetcfg, i, '\n');
 227                 extract(buf, linebuf, 0);
 228                 if (!strcasecmp(buf, node)) {
 229                         if (nexthop != NULL) {
 230                                 strcpy(nexthop, "");
 231                         }
 232                         if (secret != NULL) {
 233                                 extract(secret, linebuf, 1);
 234                         }
 235                         retval = 0;
 236                 }
 237         }
 238
 239         phree(ignetcfg);
 240         if (retval == 0) {
 241                 return(retval);         /* yup, it's a direct neighbor */
 242         }
 243
 244         /*
 245          * If we get to this point we have to see if we know the next hop
 246          */
 247         if (the_netmap != NULL) {
 248                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 249                         if (!strcasecmp(nmptr->nodename, node)) {
 250                                 if (nexthop != NULL) {
 251                                         strcpy(nexthop, nmptr->nexthop);
 252                                 }
 253                                 return(0);
 254                         }
 255                 }
 256         }
 257
 258         /*
 259          * If we get to this point, the supplied node name is bogus.
 260          */
 261         lprintf(5, "Invalid node name <%s>\n", node);
 262         return(-1);
 263 }
 264
 265
 266
 267
 268
 269 void cmd_gnet(char *argbuf) {
 270         char filename[SIZ];
 271         char buf[SIZ];
 272         FILE *fp;
 273
 274         if (CtdlAccessCheck(ac_room_aide)) return;
 275         assoc_file_name(filename, &CC->quickroom, "netconfigs");
 276         cprintf("%d Network settings for room #%ld <%s>\n",
 277                 LISTING_FOLLOWS,
 278                 CC->quickroom.QRnumber, CC->quickroom.QRname);
 279
 280         fp = fopen(filename, "r");
 281         if (fp != NULL) {
 282                 while (fgets(buf, sizeof buf, fp) != NULL) {
 283                         buf[strlen(buf)-1] = 0;
 284                         cprintf("%s\n", buf);
 285                 }
 286                 fclose(fp);
 287         }
 288
 289         cprintf("000\n");
 290 }
 291
 292
 293 void cmd_snet(char *argbuf) {
 294         char tempfilename[SIZ];
 295         char filename[SIZ];
 296         char buf[SIZ];
 297         FILE *fp;
 298
 299         if (CtdlAccessCheck(ac_room_aide)) return;
 300         safestrncpy(tempfilename, tmpnam(NULL), sizeof tempfilename);
 301         assoc_file_name(filename, &CC->quickroom, "netconfigs");
 302
 303         fp = fopen(tempfilename, "w");
 304         if (fp == NULL) {
 305                 cprintf("%d Cannot open %s: %s\n",
 306                         ERROR+INTERNAL_ERROR,
 307                         tempfilename,
 308                         strerror(errno));
 309         }
 310
 311         cprintf("%d %s\n", SEND_LISTING, tempfilename);
 312         while (client_gets(buf), strcmp(buf, "000")) {
 313                 fprintf(fp, "%s\n", buf);
 314         }
 315         fclose(fp);
 316
 317         /* Now copy the temp file to its permanent location
 318          * (We use /bin/mv instead of link() because they may be on
 319          * different filesystems)
 320          */
 321         unlink(filename);
 322         snprintf(buf, sizeof buf, "/bin/mv %s %s", tempfilename, filename);
 323         system(buf);
 324 }
 325
 326
 327
 328 /*
 329  * Spools out one message from the list.
 330  */
 331 void network_spool_msg(long msgnum, void *userdata) {
 332         struct SpoolControl *sc;
 333         struct namelist *nptr;
 334         int err;
 335         int i;
 336         char *instr = NULL;
 337         char *newpath = NULL;
 338         size_t instr_len = SIZ;
 339         struct CtdlMessage *msg = NULL;
 340         struct CtdlMessage *imsg;
 341         struct ser_ret sermsg;
 342         FILE *fp;
 343         char filename[SIZ];
 344         char buf[SIZ];
 345         int bang = 0;
 346         int send = 1;
 347         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 348
 349         sc = (struct SpoolControl *)userdata;
 350
 351         /*
 352          * Process mailing list recipients
 353          */
 354         if (sc->listrecps != NULL) {
 355
 356                 /* First, copy it to the spoolout room */
 357                 err = CtdlSaveMsgPointerInRoom(SMTP_SPOOLOUT_ROOM, msgnum, 0);
 358                 if (err != 0) return;
 359
 360                 /*
 361                  * Figure out how big a buffer we need to allocate
 362                  */
 363                 for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 364                         instr_len = instr_len + strlen(nptr->name);
 365                 }
 366
 367                 /*
 368                  * allocate...
 369                  */
 370                 lprintf(9, "Generating delivery instructions\n");
 371                 instr = mallok(instr_len);
 372                 if (instr == NULL) {
 373                         lprintf(1, "Cannot allocate %ld bytes for instr...\n",
 374                                 (long)instr_len);
 375                         abort();
 376                 }
 377                 sprintf(instr,
 378                         "Content-type: %s\n\nmsgid|%ld\nsubmitted|%ld\n"
 379                         "bounceto|postmaster@%s\n" ,
 380                         SPOOLMIME, msgnum, (long)time(NULL), config.c_fqdn );
 381
 382                 /* Generate delivery instructions for each recipient */
 383                 for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 384                         sprintf(&instr[strlen(instr)], "remote|%s|0||\n",
 385                                 nptr->name);
 386                 }
 387
 388                 /*
 389                  * Generate a message from the instructions
 390                  */
 391                 imsg = mallok(sizeof(struct CtdlMessage));
 392                 memset(imsg, 0, sizeof(struct CtdlMessage));
 393                 imsg->cm_magic = CTDLMESSAGE_MAGIC;
 394                 imsg->cm_anon_type = MES_NORMAL;
 395                 imsg->cm_format_type = FMT_RFC822;
 396                 imsg->cm_fields['A'] = strdoop("Citadel");
 397                 imsg->cm_fields['M'] = instr;
 398
 399                 /* Save delivery instructions in spoolout room */
 400                 CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM);
 401                 CtdlFreeMessage(imsg);
 402         }
 403
 404         /*
 405          * Process IGnet push shares
 406          */
 407         if (sc->ignet_push_shares != NULL) {
 408
 409                 msg = CtdlFetchMessage(msgnum);
 410                 if (msg != NULL) {
 411
 412                         /* Prepend our node name to the Path field whenever
 413                          * sending a message to another IGnet node
 414                          */
 415                         if (msg->cm_fields['P'] == NULL) {
 416                                 msg->cm_fields['P'] = strdoop("username");
 417                         }
 418                         newpath = mallok(strlen(msg->cm_fields['P']) +
 419                                         strlen(config.c_nodename) + 2);
 420                         sprintf(newpath, "%s!%s", config.c_nodename,
 421                                         msg->cm_fields['P']);
 422                         phree(msg->cm_fields['P']);
 423                         msg->cm_fields['P'] = newpath;
 424
 425                         /*
 426                          * Force the message to appear in the correct room
 427                          * on the far end by setting the C field correctly
 428                          */
 429                         if (msg->cm_fields['C'] != NULL) {
 430                                 phree(msg->cm_fields['C']);
 431                         }
 432                         msg->cm_fields['C'] = strdoop(CC->quickroom.QRname);
 433
 434                         /*
 435                          * Determine if this message is set to be deleted
 436                          * after sending out on the network
 437                          */
 438                         if (msg->cm_fields['S'] != NULL) {
 439                                 if (!strcasecmp(msg->cm_fields['S'],
 440                                    "CANCEL")) {
 441                                         delete_after_send = 1;
 442                                 }
 443                         }
 444
 445                         /*
 446                          * Now serialize it for transmission
 447                          */
 448                         serialize_message(&sermsg, msg);
 449
 450                         /* Now send it to every node */
 451                         for (nptr = sc->ignet_push_shares; nptr != NULL;
 452                             nptr = nptr->next) {
 453
 454                                 send = 1;
 455
 456                                 /* Check for valid node name */
 457                                 if (is_valid_node(NULL,NULL,nptr->name) != 0) {
 458                                         lprintf(3, "Invalid node <%s>\n",
 459                                                 nptr->name);
 460                                         send = 0;
 461                                 }
 462
 463                                 /* Check for split horizon */
 464                                 lprintf(9, "Path is %s\n", msg->cm_fields['P']);
 465                                 bang = num_tokens(msg->cm_fields['P'], '!');
 466                                 if (bang > 1) for (i=0; i<(bang-1); ++i) {
 467                                         extract_token(buf, msg->cm_fields['P'],
 468                                                 i, '!');
 469                                         if (!strcasecmp(buf, nptr->name)) {
 470                                                 send = 0;
 471                                         }
 472                                 }
 473
 474                                 /* Send the message */
 475                                 if (send == 1) {
 476                                         sprintf(filename,
 477                                                 "./network/spoolout/%s",
 478                                                 nptr->name);
 479                                         fp = fopen(filename, "ab");
 480                                         if (fp != NULL) {
 481                                                 fwrite(sermsg.ser,
 482                                                         sermsg.len, 1, fp);
 483                                                 fclose(fp);
 484                                         }
 485                                 }
 486                         }
 487                         phree(sermsg.ser);
 488                         CtdlFreeMessage(msg);
 489                 }
 490         }
 491
 492         /* update lastsent */
 493         sc->lastsent = msgnum;
 494
 495         /* Delete this message if delete-after-send is set */
 496         if (delete_after_send) {
 497                 CtdlDeleteMessages(CC->quickroom.QRname, msgnum, "");
 498         }
 499
 500 }
 501
 502
 503
 504
 505 /*
 506  * Batch up and send all outbound traffic from the current room
 507  */
 508 void network_spoolout_room(char *room_to_spool) {
 509         char filename[SIZ];
 510         char buf[SIZ];
 511         char instr[SIZ];
 512         FILE *fp;
 513         struct SpoolControl sc;
 514         /* struct namelist *digestrecps = NULL; */
 515         struct namelist *nptr;
 516
 517         lprintf(7, "Spooling <%s>\n", room_to_spool);
 518         if (getroom(&CC->quickroom, room_to_spool) != 0) {
 519                 lprintf(1, "ERROR: cannot load <%s>\n", room_to_spool);
 520                 return;
 521         }
 522
 523         memset(&sc, 0, sizeof(struct SpoolControl));
 524         assoc_file_name(filename, &CC->quickroom, "netconfigs");
 525
 526         fp = fopen(filename, "r");
 527         if (fp == NULL) {
 528                 lprintf(7, "Outbound batch processing skipped for <%s>\n",
 529                         CC->quickroom.QRname);
 530                 return;
 531         }
 532
 533         lprintf(5, "Outbound batch processing started for <%s>\n",
 534                 CC->quickroom.QRname);
 535
 536         while (fgets(buf, sizeof buf, fp) != NULL) {
 537                 buf[strlen(buf)-1] = 0;
 538
 539                 extract(instr, buf, 0);
 540                 if (!strcasecmp(instr, "lastsent")) {
 541                         sc.lastsent = extract_long(buf, 1);
 542                 }
 543                 else if (!strcasecmp(instr, "listrecp")) {
 544                         nptr = (struct namelist *)
 545                                 mallok(sizeof(struct namelist));
 546                         nptr->next = sc.listrecps;
 547                         extract(nptr->name, buf, 1);
 548                         sc.listrecps = nptr;
 549                 }
 550                 else if (!strcasecmp(instr, "ignet_push_share")) {
 551                         nptr = (struct namelist *)
 552                                 mallok(sizeof(struct namelist));
 553                         nptr->next = sc.ignet_push_shares;
 554                         extract(nptr->name, buf, 1);
 555                         sc.ignet_push_shares = nptr;
 556                 }
 557
 558
 559         }
 560         fclose(fp);
 561
 562
 563         /* Do something useful */
 564         CtdlForEachMessage(MSGS_GT, sc.lastsent, (-63), NULL, NULL,
 565                 network_spool_msg, &sc);
 566
 567
 568         /* Now rewrite the config file */
 569         fp = fopen(filename, "w");
 570         if (fp == NULL) {
 571                 lprintf(1, "ERROR: cannot open %s: %s\n",
 572                         filename, strerror(errno));
 573         }
 574         else {
 575                 fprintf(fp, "lastsent|%ld\n", sc.lastsent);
 576
 577                 /* Write out the listrecps while freeing from memory at the
 578                  * same time.  Am I clever or what?  :)
 579                  */
 580                 while (sc.listrecps != NULL) {
 581                         fprintf(fp, "listrecp|%s\n", sc.listrecps->name);
 582                         nptr = sc.listrecps->next;
 583                         phree(sc.listrecps);
 584                         sc.listrecps = nptr;
 585                 }
 586                 while (sc.ignet_push_shares != NULL) {
 587                         fprintf(fp, "ignet_push_share|%s\n",
 588                                 sc.ignet_push_shares->name);
 589                         nptr = sc.ignet_push_shares->next;
 590                         phree(sc.ignet_push_shares);
 591                         sc.ignet_push_shares = nptr;
 592                 }
 593
 594                 fclose(fp);
 595         }
 596
 597         lprintf(5, "Outbound batch processing finished for <%s>\n",
 598                 CC->quickroom.QRname);
 599 }
 600
 601
 602 /*
 603  * Batch up and send all outbound traffic from the current room
 604  */
 605 void network_queue_room(struct quickroom *qrbuf, void *data) {
 606         struct RoomProcList *ptr;
 607
 608         ptr = (struct RoomProcList *) mallok(sizeof (struct RoomProcList));
 609         if (ptr == NULL) return;
 610
 611         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
 612         ptr->next = rplist;
 613         rplist = ptr;
 614 }
 615
 616
 617 /*
 618  * Learn topology from path fields
 619  */
 620 void network_learn_topology(char *node, char *path) {
 621         char nexthop[SIZ];
 622         struct NetMap *nmptr;
 623
 624         strcpy(nexthop, "");
 625
 626         if (num_tokens(path, '!') < 3) return;
 627         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 628                 if (!strcasecmp(nmptr->nodename, node)) {
 629                         extract_token(nmptr->nexthop, path, 0, '!');
 630                         nmptr->lastcontact = time(NULL);
 631                         return;
 632                 }
 633         }
 634
 635         /* If we got here then it's not in the map, so add it. */
 636         nmptr = (struct NetMap *) mallok(sizeof (struct NetMap));
 637         strcpy(nmptr->nodename, node);
 638         nmptr->lastcontact = time(NULL);
 639         extract_token(nmptr->nexthop, path, 0, '!');
 640         nmptr->next = the_netmap;
 641         the_netmap = nmptr;
 642 }
 643
 644
 645
 646
 647 /*
 648  * Bounce a message back to the sender
 649  */
 650 void network_bounce(struct CtdlMessage *msg, char *reason) {
 651         char *oldpath = NULL;
 652         char buf[SIZ];
 653         char bouncesource[SIZ];
 654         char recipient[SIZ];
 655         struct recptypes *valid = NULL;
 656         char force_room[ROOMNAMELEN];
 657         static int serialnum = 0;
 658
 659         lprintf(9, "entering network_bounce()\n");
 660
 661         if (msg == NULL) return;
 662
 663         sprintf(bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
 664
 665         /*
 666          * Give it a fresh message ID
 667          */
 668         if (msg->cm_fields['I'] != NULL) {
 669                 phree(msg->cm_fields['I']);
 670         }
 671         sprintf(buf, "%ld.%04x.%04x@%s",
 672                 (long)time(NULL), getpid(), ++serialnum, config.c_fqdn);
 673         msg->cm_fields['I'] = strdoop(buf);
 674
 675         /*
 676          * FIXME ... right now we're just sending a bounce; we really want to
 677          * include the text of the bounced message.
 678          */
 679         if (msg->cm_fields['M'] != NULL) {
 680                 phree(msg->cm_fields['M']);
 681         }
 682         msg->cm_fields['M'] = strdoop(reason);
 683         msg->cm_format_type = 0;
 684
 685         /*
 686          * Turn the message around
 687          */
 688         if (msg->cm_fields['R'] == NULL) {
 689                 phree(msg->cm_fields['R']);
 690         }
 691
 692         if (msg->cm_fields['D'] == NULL) {
 693                 phree(msg->cm_fields['D']);
 694         }
 695
 696         snprintf(recipient, sizeof recipient, "%s@%s",
 697                 msg->cm_fields['A'], msg->cm_fields['N']);
 698
 699         if (msg->cm_fields['A'] == NULL) {
 700                 phree(msg->cm_fields['A']);
 701         }
 702
 703         if (msg->cm_fields['N'] == NULL) {
 704                 phree(msg->cm_fields['N']);
 705         }
 706
 707         msg->cm_fields['A'] = strdoop(BOUNCESOURCE);
 708         msg->cm_fields['N'] = strdoop(config.c_nodename);
 709
 710
 711         /* prepend our node to the path */
 712         if (msg->cm_fields['P'] != NULL) {
 713                 oldpath = msg->cm_fields['P'];
 714                 msg->cm_fields['P'] = NULL;
 715         }
 716         else {
 717                 oldpath = strdoop("unknown_user");
 718         }
 719         msg->cm_fields['P'] = mallok(strlen(oldpath) + SIZ);
 720         sprintf(msg->cm_fields['P'], "%s!%s", config.c_nodename, oldpath);
 721         phree(oldpath);
 722
 723         /* Now submit the message */
 724         valid = validate_recipients(recipient);
 725         if (valid != NULL) if (valid->num_error > 0) {
 726                 phree(valid);
 727                 valid = NULL;
 728         }
 729         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
 730                 strcpy(force_room, AIDEROOM);
 731         }
 732         else {
 733                 strcpy(force_room, "");
 734         }
 735         if ( (valid == NULL) && (strlen(force_room) == 0) ) {
 736                 strcpy(force_room, AIDEROOM);
 737         }
 738         CtdlSubmitMsg(msg, valid, force_room);
 739
 740         /* Clean up */
 741         if (valid != NULL) phree(valid);
 742         CtdlFreeMessage(msg);
 743         lprintf(9, "leaving network_bounce()\n");
 744 }
 745
 746
 747
 748
 749 /*
 750  * Process a buffer containing a single message from a single file
 751  * from the inbound queue
 752  */
 753 void network_process_buffer(char *buffer, long size) {
 754         struct CtdlMessage *msg;
 755         long pos;
 756         int field;
 757         struct recptypes *recp = NULL;
 758         char target_room[ROOMNAMELEN];
 759         struct ser_ret sermsg;
 760         char *oldpath = NULL;
 761         char filename[SIZ];
 762         FILE *fp;
 763         char buf[SIZ];
 764
 765         /* Set default target room to trash */
 766         strcpy(target_room, TWITROOM);
 767
 768         /* Load the message into memory */
 769         msg = (struct CtdlMessage *) mallok(sizeof(struct CtdlMessage));
 770         memset(msg, 0, sizeof(struct CtdlMessage));
 771         msg->cm_magic = CTDLMESSAGE_MAGIC;
 772         msg->cm_anon_type = buffer[1];
 773         msg->cm_format_type = buffer[2];
 774
 775         for (pos = 3; pos < size; ++pos) {
 776                 field = buffer[pos];
 777                 msg->cm_fields[field] = strdoop(&buffer[pos+1]);
 778                 pos = pos + strlen(&buffer[(int)pos]);
 779         }
 780
 781         /* Check for message routing */
 782         if (msg->cm_fields['D'] != NULL) {
 783                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
 784
 785                         /* route the message */
 786                         if (is_valid_node(NULL, NULL,
 787                            msg->cm_fields['D']) == 0) {
 788
 789                                 /* prepend our node to the path */
 790                                 if (msg->cm_fields['P'] != NULL) {
 791                                         oldpath = msg->cm_fields['P'];
 792                                         msg->cm_fields['P'] = NULL;
 793                                 }
 794                                 else {
 795                                         oldpath = strdoop("unknown_user");
 796                                 }
 797                                 msg->cm_fields['P'] =
 798                                         mallok(strlen(oldpath) + SIZ);
 799                                 sprintf(msg->cm_fields['P'], "%s!%s",
 800                                         config.c_nodename, oldpath);
 801                                 phree(oldpath);
 802
 803                                 /* serialize the message */
 804                                 serialize_message(&sermsg, msg);
 805
 806                                 /* now send it */
 807                                 sprintf(filename,
 808                                         "./network/spoolout/%s",
 809                                         msg->cm_fields['D']);
 810                                 fp = fopen(filename, "ab");
 811                                 if (fp != NULL) {
 812                                         fwrite(sermsg.ser,
 813                                                 sermsg.len, 1, fp);
 814                                         fclose(fp);
 815                                 }
 816                                 phree(sermsg.ser);
 817                                 CtdlFreeMessage(msg);
 818                                 return;
 819                         }
 820
 821                         else {  /* invalid destination node name */
 822
 823                                 network_bounce(msg,
 824 "A message you sent could not be delivered due to an invalid destination node"
 825 " name.  Please check the address and try sending the message again.\n");
 826                                 msg = NULL;
 827                                 return;
 828
 829                         }
 830                 }
 831         }
 832
 833         /*
 834          * Check to see if we already have a copy of this message
 835          */
 836         if (network_usetable(msg) != 0) {
 837                 sprintf(buf,
 838                         "Loopzapper rejected message <%s> "
 839                         "from <%s> in <%s> @ <%s>\n",
 840                         ((msg->cm_fields['I']!=NULL)?(msg->cm_fields['I']):""),
 841                         ((msg->cm_fields['A']!=NULL)?(msg->cm_fields['A']):""),
 842                         ((msg->cm_fields['O']!=NULL)?(msg->cm_fields['O']):""),
 843                         ((msg->cm_fields['N']!=NULL)?(msg->cm_fields['N']):"")
 844                 );
 845                 aide_message(buf);
 846                 CtdlFreeMessage(msg);
 847                 msg = NULL;
 848                 return;
 849         }
 850
 851         /* Learn network topology from the path */
 852         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
 853                 network_learn_topology(msg->cm_fields['N'],
 854                                         msg->cm_fields['P']);
 855         }
 856
 857         /* Does it have a recipient?  If so, validate it... */
 858         if (msg->cm_fields['R'] != NULL) {
 859                 recp = validate_recipients(msg->cm_fields['R']);
 860                 if (recp != NULL) if (recp->num_error > 0) {
 861                         network_bounce(msg,
 862 "A message you sent could not be delivered due to an invalid address.\n"
 863 "Please check the address and try sending the message again.\n");
 864                         msg = NULL;
 865                         phree(recp);
 866                         return;
 867                 }
 868                 strcpy(target_room, "");        /* no target room if mail */
 869         }
 870
 871         else if (msg->cm_fields['C'] != NULL) {
 872                 safestrncpy(target_room,
 873                         msg->cm_fields['C'],
 874                         sizeof target_room);
 875         }
 876
 877         else if (msg->cm_fields['O'] != NULL) {
 878                 safestrncpy(target_room,
 879                         msg->cm_fields['O'],
 880                         sizeof target_room);
 881         }
 882
 883         /* Strip out fields that are only relevant during transit */
 884         if (msg->cm_fields['D'] != NULL) {
 885                 phree(msg->cm_fields['D']);
 886                 msg->cm_fields['D'] = NULL;
 887         }
 888         if (msg->cm_fields['C'] != NULL) {
 889                 phree(msg->cm_fields['C']);
 890                 msg->cm_fields['C'] = NULL;
 891         }
 892
 893         /* save the message into a room */
 894         if (PerformNetprocHooks(msg, target_room) == 0) {
 895                 msg->cm_flags = CM_SKIP_HOOKS;
 896                 CtdlSubmitMsg(msg, recp, target_room);
 897         }
 898         CtdlFreeMessage(msg);
 899         phree(recp);
 900 }
 901
 902
 903 /*
 904  * Process a single message from a single file from the inbound queue
 905  */
 906 void network_process_message(FILE *fp, long msgstart, long msgend) {
 907         long hold_pos;
 908         long size;
 909         char *buffer;
 910
 911         hold_pos = ftell(fp);
 912         size = msgend - msgstart + 1;
 913         buffer = mallok(size);
 914         if (buffer != NULL) {
 915                 fseek(fp, msgstart, SEEK_SET);
 916                 fread(buffer, size, 1, fp);
 917                 network_process_buffer(buffer, size);
 918                 phree(buffer);
 919         }
 920
 921         fseek(fp, hold_pos, SEEK_SET);
 922 }
 923
 924
 925 /*
 926  * Process a single file from the inbound queue
 927  */
 928 void network_process_file(char *filename) {
 929         FILE *fp;
 930         long msgstart = (-1L);
 931         long msgend = (-1L);
 932         long msgcur = 0L;
 933         int ch;
 934
 935         lprintf(7, "network: processing <%s>\n", filename);
 936
 937         fp = fopen(filename, "rb");
 938         if (fp == NULL) {
 939                 lprintf(5, "Error opening %s: %s\n",
 940                         filename, strerror(errno));
 941                 return;
 942         }
 943
 944         /* Look for messages in the data stream and break them out */
 945         while (ch = getc(fp), ch >= 0) {
 946
 947                 if (ch == 255) {
 948                         if (msgstart >= 0L) {
 949                                 msgend = msgcur - 1;
 950                                 network_process_message(fp, msgstart, msgend);
 951                         }
 952                         msgstart = msgcur;
 953                 }
 954
 955                 ++msgcur;
 956         }
 957
 958         msgend = msgcur - 1;
 959         if (msgstart >= 0L) {
 960                 network_process_message(fp, msgstart, msgend);
 961         }
 962
 963         fclose(fp);
 964         unlink(filename);
 965 }
 966
 967
 968 /*
 969  * Process anything in the inbound queue
 970  */
 971 void network_do_spoolin(void) {
 972         DIR *dp;
 973         struct dirent *d;
 974         char filename[SIZ];
 975
 976         dp = opendir("./network/spoolin");
 977         if (dp == NULL) return;
 978
 979         while (d = readdir(dp), d != NULL) {
 980                 sprintf(filename, "./network/spoolin/%s", d->d_name);
 981                 network_process_file(filename);
 982         }
 983
 984
 985         closedir(dp);
 986 }
 987
 988
 989
 990
 991
 992 /*
 993  * receive network spool from the remote system
 994  */
 995 void receive_spool(int sock, char *remote_nodename) {
 996         long download_len;
 997         long bytes_received;
 998         char buf[SIZ];
 999         static char pbuf[IGNET_PACKET_SIZE];
1000         char tempfilename[PATH_MAX];
1001         long plen;
1002         FILE *fp;
1003
1004         strcpy(tempfilename, tmpnam(NULL));
1005         if (sock_puts(sock, "NDOP") < 0) return;
1006         if (sock_gets(sock, buf) < 0) return;
1007         lprintf(9, "<%s\n", buf);
1008         if (buf[0] != '2') {
1009                 return;
1010         }
1011         download_len = extract_long(&buf[4], 0);
1012
1013         bytes_received = 0L;
1014         fp = fopen(tempfilename, "w");
1015         if (fp == NULL) {
1016                 lprintf(9, "cannot open download file locally: %s\n",
1017                         strerror(errno));
1018                 return;
1019         }
1020
1021         while (bytes_received < download_len) {
1022                 sprintf(buf, "READ %ld|%ld",
1023                         bytes_received,
1024                      ((download_len - bytes_received > IGNET_PACKET_SIZE)
1025                  ? IGNET_PACKET_SIZE : (download_len - bytes_received)));
1026                 if (sock_puts(sock, buf) < 0) {
1027                         fclose(fp);
1028                         unlink(tempfilename);
1029                         return;
1030                 }
1031                 if (sock_gets(sock, buf) < 0) {
1032                         fclose(fp);
1033                         unlink(tempfilename);
1034                         return;
1035                 }
1036                 if (buf[0] == '6') {
1037                         plen = extract_long(&buf[4], 0);
1038                         if (sock_read(sock, pbuf, plen) < 0) {
1039                                 fclose(fp);
1040                                 unlink(tempfilename);
1041                                 return;
1042                         }
1043                         fwrite((char *) pbuf, plen, 1, fp);
1044                         bytes_received = bytes_received + plen;
1045                 }
1046         }
1047
1048         fclose(fp);
1049         if (sock_puts(sock, "CLOS") < 0) {
1050                 unlink(tempfilename);
1051                 return;
1052         }
1053         if (sock_gets(sock, buf) < 0) {
1054                 unlink(tempfilename);
1055                 return;
1056         }
1057         lprintf(9, "%s\n", buf);
1058         sprintf(buf, "mv %s ./network/spoolin/%s.%ld",
1059                 tempfilename, remote_nodename, (long) getpid());
1060         system(buf);
1061 }
1062
1063
1064
1065 /*
1066  * transmit network spool to the remote system
1067  */
1068 void transmit_spool(int sock, char *remote_nodename)
1069 {
1070         char buf[SIZ];
1071         char pbuf[4096];
1072         long plen;
1073         long bytes_to_write, thisblock;
1074         int fd;
1075         char sfname[128];
1076
1077         if (sock_puts(sock, "NUOP") < 0) return;
1078         if (sock_gets(sock, buf) < 0) return;
1079         lprintf(9, "<%s\n", buf);
1080         if (buf[0] != '2') {
1081                 return;
1082         }
1083
1084         sprintf(sfname, "./network/spoolout/%s", remote_nodename);
1085         fd = open(sfname, O_RDONLY);
1086         if (fd < 0) {
1087                 if (errno == ENOENT) {
1088                         lprintf(9, "Nothing to send.\n");
1089                 } else {
1090                         lprintf(5, "cannot open upload file locally: %s\n",
1091                                 strerror(errno));
1092                 }
1093                 return;
1094         }
1095         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
1096                 bytes_to_write = plen;
1097                 while (bytes_to_write > 0L) {
1098                         sprintf(buf, "WRIT %ld", bytes_to_write);
1099                         if (sock_puts(sock, buf) < 0) {
1100                                 close(fd);
1101                                 return;
1102                         }
1103                         if (sock_gets(sock, buf) < 0) {
1104                                 close(fd);
1105                                 return;
1106                         }
1107                         thisblock = atol(&buf[4]);
1108                         if (buf[0] == '7') {
1109                                 if (sock_write(sock, pbuf,
1110                                    (int) thisblock) < 0) {
1111                                         close(fd);
1112                                         return;
1113                                 }
1114                                 bytes_to_write = bytes_to_write - thisblock;
1115                         } else {
1116                                 goto ABORTUPL;
1117                         }
1118                 }
1119         }
1120
1121 ABORTUPL:
1122         close(fd);
1123         if (sock_puts(sock, "UCLS 1") < 0) return;
1124         if (sock_gets(sock, buf) < 0) return;
1125         lprintf(9, "<%s\n", buf);
1126         if (buf[0] == '2') {
1127                 unlink(sfname);
1128         }
1129 }
1130
1131
1132
1133 /*
1134  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
1135  */
1136 void network_poll_node(char *node, char *secret, char *host, char *port) {
1137         int sock;
1138         char buf[SIZ];
1139
1140         if (network_talking_to(node, NTT_CHECK)) return;
1141         network_talking_to(node, NTT_ADD);
1142         lprintf(5, "Polling node <%s> at %s:%s\n", node, host, port);
1143
1144         sock = sock_connect(host, port, "tcp");
1145         if (sock < 0) {
1146                 lprintf(7, "Could not connect: %s\n", strerror(errno));
1147                 network_talking_to(node, NTT_REMOVE);
1148                 return;
1149         }
1150
1151         lprintf(9, "Connected!\n");
1152
1153         /* Read the server greeting */
1154         if (sock_gets(sock, buf) < 0) goto bail;
1155         lprintf(9, ">%s\n", buf);
1156
1157         /* Identify ourselves */
1158         sprintf(buf, "NETP %s|%s", config.c_nodename, secret);
1159         lprintf(9, "<%s\n", buf);
1160         if (sock_puts(sock, buf) <0) goto bail;
1161         if (sock_gets(sock, buf) < 0) goto bail;
1162         lprintf(9, ">%s\n", buf);
1163         if (buf[0] != '2') goto bail;
1164
1165         /* At this point we are authenticated. */
1166         receive_spool(sock, node);
1167         transmit_spool(sock, node);
1168
1169         sock_puts(sock, "QUIT");
1170 bail:   sock_close(sock);
1171         network_talking_to(node, NTT_REMOVE);
1172 }
1173
1174
1175
1176 /*
1177  * Poll other Citadel nodes and transfer inbound/outbound network data.
1178  */
1179 void network_poll_other_citadel_nodes(void) {
1180         char *ignetcfg = NULL;
1181         int i;
1182         char linebuf[SIZ];
1183         char node[SIZ];
1184         char host[SIZ];
1185         char port[SIZ];
1186         char secret[SIZ];
1187
1188         ignetcfg = CtdlGetSysConfig(IGNETCFG);
1189         if (ignetcfg == NULL) return;   /* no nodes defined */
1190
1191         /* Use the string tokenizer to grab one line at a time */
1192         for (i=0; i<num_tokens(ignetcfg, '\n'); ++i) {
1193                 extract_token(linebuf, ignetcfg, i, '\n');
1194                 extract(node, linebuf, 0);
1195                 extract(secret, linebuf, 1);
1196                 extract(host, linebuf, 2);
1197                 extract(port, linebuf, 3);
1198                 if ( (strlen(node) > 0) && (strlen(secret) > 0)
1199                    && (strlen(host) > 0) && strlen(port) > 0) {
1200                         network_poll_node(node, secret, host, port);
1201                 }
1202         }
1203
1204         phree(ignetcfg);
1205 }
1206
1207
1208
1209
1210
1211
1212
1213 /*
1214  * network_do_queue()
1215  *
1216  * Run through the rooms doing various types of network stuff.
1217  */
1218 void network_do_queue(void) {
1219         static int doing_queue = 0;
1220         static time_t last_run = 0L;
1221         struct RoomProcList *ptr;
1222
1223         /*
1224          * Run no more frequently than once every n seconds
1225          */
1226         if ( (time(NULL) - last_run) < config.c_net_freq ) return;
1227
1228         /*
1229          * This is a simple concurrency check to make sure only one queue run
1230          * is done at a time.  We could do this with a mutex, but since we
1231          * don't really require extremely fine granularity here, we'll do it
1232          * with a static variable instead.
1233          */
1234         if (doing_queue) return;
1235         doing_queue = 1;
1236         last_run = time(NULL);
1237
1238         /*
1239          * Poll other Citadel nodes.
1240          */
1241         network_poll_other_citadel_nodes();
1242
1243         /*
1244          * Load the network map into memory.
1245          */
1246         read_network_map();
1247
1248         /*
1249          * Go ahead and run the queue
1250          */
1251         lprintf(7, "network: loading outbound queue\n");
1252         ForEachRoom(network_queue_room, NULL);
1253
1254         lprintf(7, "network: running outbound queue\n");
1255         while (rplist != NULL) {
1256                 network_spoolout_room(rplist->name);
1257                 ptr = rplist;
1258                 rplist = rplist->next;
1259                 phree(ptr);
1260         }
1261
1262         lprintf(7, "network: processing inbound queue\n");
1263         network_do_spoolin();
1264
1265         /* Save the network map back to disk */
1266         write_network_map();
1267
1268         lprintf(7, "network: queue run completed\n");
1269         doing_queue = 0;
1270 }
1271
1272
1273
1274 /*
1275  * cmd_netp() - authenticate to the server as another Citadel node polling
1276  *              for network traffic
1277  */
1278 void cmd_netp(char *cmdbuf)
1279 {
1280         char node[SIZ];
1281         char pass[SIZ];
1282
1283         char secret[SIZ];
1284         char nexthop[SIZ];
1285
1286         extract(node, cmdbuf, 0);
1287         extract(pass, cmdbuf, 1);
1288
1289         if (is_valid_node(nexthop, secret, node) != 0) {
1290                 cprintf("%d authentication failed\n", ERROR);
1291                 return;
1292         }
1293
1294         if (strcasecmp(pass, secret)) {
1295                 cprintf("%d authentication failed\n", ERROR);
1296                 return;
1297         }
1298
1299         if (network_talking_to(node, NTT_CHECK)) {
1300                 cprintf("%d Already talking to %s right now\n", ERROR, node);
1301                 return;
1302         }
1303
1304         safestrncpy(CC->net_node, node, sizeof CC->net_node);
1305         network_talking_to(node, NTT_ADD);
1306         cprintf("%d authenticated as network node '%s'\n", OK,
1307                 CC->net_node);
1308 }
1309
1310
1311
1312 /*
1313  * Module entry point
1314  */
1315 char *Dynamic_Module_Init(void)
1316 {
1317         CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
1318         CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
1319         CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
1320         CtdlRegisterSessionHook(network_do_queue, EVT_TIMER);
1321         return "$Id$";
1322 }