citadel/serv_network.c

   1 /*
   2  * $Id$
   3  *
   4  * This module handles shared rooms, inter-Citadel mail, and outbound
   5  * mailing list processing.
   6  *
   7  * Copyright (C) 2000-2002 by Art Cancro and others.
   8  * This code is released under the terms of the GNU General Public License.
   9  *
  10  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  11  * This is a fairly high-level type of critical section.  It ensures that no
  12  * two threads work on the netconfigs files at the same time.  Since we do
  13  * so many things inside these, here are the rules:
  14  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  15  *  2. Do *not* perform any I/O with the client during these sections.
  16  *
  17  */
  18
  19 /*
  20  * Duration of time (in seconds) after which pending list subscribe/unsubscribe
  21  * requests that have not been confirmed will be deleted.
  22  */
  23 #define EXP     259200  /* three days */
  24
  25 #include "sysdep.h"
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <stdio.h>
  29 #include <fcntl.h>
  30 #include <ctype.h>
  31 #include <signal.h>
  32 #include <pwd.h>
  33 #include <errno.h>
  34 #include <sys/types.h>
  35 #include <dirent.h>
  36 #if TIME_WITH_SYS_TIME
  37 # include <sys/time.h>
  38 # include <time.h>
  39 #else
  40 # if HAVE_SYS_TIME_H
  41 #  include <sys/time.h>
  42 # else
  43 #  include <time.h>
  44 # endif
  45 #endif
  46
  47 #include <sys/wait.h>
  48 #include <string.h>
  49 #include <limits.h>
  50 #include "citadel.h"
  51 #include "server.h"
  52 #include "sysdep_decls.h"
  53 #include "citserver.h"
  54 #include "support.h"
  55 #include "config.h"
  56 #include "serv_extensions.h"
  57 #include "room_ops.h"
  58 #include "user_ops.h"
  59 #include "policy.h"
  60 #include "database.h"
  61 #include "msgbase.h"
  62 #include "tools.h"
  63 #include "internet_addressing.h"
  64 #include "serv_network.h"
  65 #include "clientsocket.h"
  66 #include "file_ops.h"
  67
  68 #ifndef HAVE_SNPRINTF
  69 #include "snprintf.h"
  70 #endif
  71
  72 /* Nonzero while we are doing outbound network processing */
  73 static int doing_queue = 0;
  74
  75 /*
  76  * When we do network processing, it's accomplished in two passes; one to
  77  * gather a list of rooms and one to actually do them.  It's ok that rplist
  78  * is global; this process *only* runs as part of the housekeeping loop and
  79  * therefore only one will run at a time.
  80  */
  81 struct RoomProcList *rplist = NULL;
  82
  83 /*
  84  * We build a map of network nodes during processing.
  85  */
  86 struct NetMap *the_netmap = NULL;
  87 char *working_ignetcfg = NULL;
  88
  89 /*
  90  * Load or refresh the Citadel network (IGnet) configuration for this node.
  91  */
  92 void load_working_ignetcfg(void) {
  93         char *cfg;
  94         char *oldcfg;
  95
  96         cfg = CtdlGetSysConfig(IGNETCFG);
  97         if (cfg == NULL) {
  98                 cfg = strdup("");
  99         }
 100
 101         oldcfg = working_ignetcfg;
 102         working_ignetcfg = cfg;
 103         if (oldcfg != NULL) {
 104                 free(oldcfg);
 105         }
 106 }
 107
 108
 109
 110
 111
 112 /*
 113  * Keep track of what messages to reject
 114  */
 115 struct FilterList *load_filter_list(void) {
 116         char *serialized_list = NULL;
 117         int i;
 118         char buf[SIZ];
 119         struct FilterList *newlist = NULL;
 120         struct FilterList *nptr;
 121
 122         serialized_list = CtdlGetSysConfig(FILTERLIST);
 123         if (serialized_list == NULL) return(NULL); /* if null, no entries */
 124
 125         /* Use the string tokenizer to grab one line at a time */
 126         for (i=0; i<num_tokens(serialized_list, '\n'); ++i) {
 127                 extract_token(buf, serialized_list, i, '\n', sizeof buf);
 128                 nptr = (struct FilterList *) malloc(sizeof(struct FilterList));
 129                 extract_token(nptr->fl_user, buf, 0, '|', sizeof nptr->fl_user);
 130                 striplt(nptr->fl_user);
 131                 extract_token(nptr->fl_room, buf, 1, '|', sizeof nptr->fl_room);
 132                 striplt(nptr->fl_room);
 133                 extract_token(nptr->fl_node, buf, 2, '|', sizeof nptr->fl_node);
 134                 striplt(nptr->fl_node);
 135
 136                 /* Cowardly refuse to add an any/any/any entry that would
 137                  * end up filtering every single message.
 138                  */
 139                 if (strlen(nptr->fl_user) + strlen(nptr->fl_room)
 140                    + strlen(nptr->fl_node) == 0) {
 141                         free(nptr);
 142                 }
 143                 else {
 144                         nptr->next = newlist;
 145                         newlist = nptr;
 146                 }
 147         }
 148
 149         free(serialized_list);
 150         return newlist;
 151 }
 152
 153
 154 void free_filter_list(struct FilterList *fl) {
 155         if (fl == NULL) return;
 156         free_filter_list(fl->next);
 157         free(fl);
 158 }
 159
 160
 161
 162 /*
 163  * Check the use table.  This is a list of messages which have recently
 164  * arrived on the system.  It is maintained and queried to prevent the same
 165  * message from being entered into the database multiple times if it happens
 166  * to arrive multiple times by accident.
 167  */
 168 int network_usetable(struct CtdlMessage *msg) {
 169
 170         char msgid[SIZ];
 171         struct cdbdata *cdbut;
 172         struct UseTable ut;
 173
 174         /* Bail out if we can't generate a message ID */
 175         if (msg == NULL) {
 176                 return(0);
 177         }
 178         if (msg->cm_fields['I'] == NULL) {
 179                 return(0);
 180         }
 181         if (strlen(msg->cm_fields['I']) == 0) {
 182                 return(0);
 183         }
 184
 185         /* Generate the message ID */
 186         strcpy(msgid, msg->cm_fields['I']);
 187         if (haschar(msgid, '@') == 0) {
 188                 strcat(msgid, "@");
 189                 if (msg->cm_fields['N'] != NULL) {
 190                         strcat(msgid, msg->cm_fields['N']);
 191                 }
 192                 else {
 193                         return(0);
 194                 }
 195         }
 196
 197         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 198         if (cdbut != NULL) {
 199                 cdb_free(cdbut);
 200                 return(1);
 201         }
 202
 203         /* If we got to this point, it's unique: add it. */
 204         strcpy(ut.ut_msgid, msgid);
 205         ut.ut_timestamp = time(NULL);
 206         cdb_store(CDB_USETABLE, msgid, strlen(msgid),
 207                 &ut, sizeof(struct UseTable) );
 208         return(0);
 209 }
 210
 211
 212 /*
 213  * Read the network map from its configuration file into memory.
 214  */
 215 void read_network_map(void) {
 216         char *serialized_map = NULL;
 217         int i;
 218         char buf[SIZ];
 219         struct NetMap *nmptr;
 220
 221         serialized_map = CtdlGetSysConfig(IGNETMAP);
 222         if (serialized_map == NULL) return;     /* if null, no entries */
 223
 224         /* Use the string tokenizer to grab one line at a time */
 225         for (i=0; i<num_tokens(serialized_map, '\n'); ++i) {
 226                 extract_token(buf, serialized_map, i, '\n', sizeof buf);
 227                 nmptr = (struct NetMap *) malloc(sizeof(struct NetMap));
 228                 extract_token(nmptr->nodename, buf, 0, '|', sizeof nmptr->nodename);
 229                 nmptr->lastcontact = extract_long(buf, 1);
 230                 extract_token(nmptr->nexthop, buf, 2, '|', sizeof nmptr->nexthop);
 231                 nmptr->next = the_netmap;
 232                 the_netmap = nmptr;
 233         }
 234
 235         free(serialized_map);
 236 }
 237
 238
 239 /*
 240  * Write the network map from memory back to the configuration file.
 241  */
 242 void write_network_map(void) {
 243         char *serialized_map = NULL;
 244         struct NetMap *nmptr;
 245
 246         serialized_map = strdup("");
 247
 248         if (the_netmap != NULL) {
 249                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 250                         serialized_map = realloc(serialized_map,
 251                                                 (strlen(serialized_map)+SIZ) );
 252                         if (strlen(nmptr->nodename) > 0) {
 253                                 snprintf(&serialized_map[strlen(serialized_map)],
 254                                         SIZ,
 255                                         "%s|%ld|%s\n",
 256                                         nmptr->nodename,
 257                                         (long)nmptr->lastcontact,
 258                                         nmptr->nexthop);
 259                         }
 260                 }
 261         }
 262
 263         CtdlPutSysConfig(IGNETMAP, serialized_map);
 264         free(serialized_map);
 265
 266         /* Now free the list */
 267         while (the_netmap != NULL) {
 268                 nmptr = the_netmap->next;
 269                 free(the_netmap);
 270                 the_netmap = nmptr;
 271         }
 272 }
 273
 274
 275
 276 /*
 277  * Check the network map and determine whether the supplied node name is
 278  * valid.  If it is not a neighbor node, supply the name of a neighbor node
 279  * which is the next hop.  If it *is* a neighbor node, we also fill in the
 280  * shared secret.
 281  */
 282 int is_valid_node(char *nexthop, char *secret, char *node) {
 283         int i;
 284         char linebuf[SIZ];
 285         char buf[SIZ];
 286         int retval;
 287         struct NetMap *nmptr;
 288
 289         if (node == NULL) {
 290                 return(-1);
 291         }
 292
 293         /*
 294          * First try the neighbor nodes
 295          */
 296         if (working_ignetcfg == NULL) {
 297                 lprintf(CTDL_ERR, "working_ignetcfg is NULL!\n");
 298                 if (nexthop != NULL) {
 299                         strcpy(nexthop, "");
 300                 }
 301                 return(-1);
 302         }
 303
 304         retval = (-1);
 305         if (nexthop != NULL) {
 306                 strcpy(nexthop, "");
 307         }
 308
 309         /* Use the string tokenizer to grab one line at a time */
 310         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
 311                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
 312                 extract_token(buf, linebuf, 0, '|', sizeof buf);
 313                 if (!strcasecmp(buf, node)) {
 314                         if (nexthop != NULL) {
 315                                 strcpy(nexthop, "");
 316                         }
 317                         if (secret != NULL) {
 318                                 extract_token(secret, linebuf, 1, '|', 256);
 319                         }
 320                         retval = 0;
 321                 }
 322         }
 323
 324         if (retval == 0) {
 325                 return(retval);         /* yup, it's a direct neighbor */
 326         }
 327
 328         /*
 329          * If we get to this point we have to see if we know the next hop
 330          */
 331         if (the_netmap != NULL) {
 332                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 333                         if (!strcasecmp(nmptr->nodename, node)) {
 334                                 if (nexthop != NULL) {
 335                                         strcpy(nexthop, nmptr->nexthop);
 336                                 }
 337                                 return(0);
 338                         }
 339                 }
 340         }
 341
 342         /*
 343          * If we get to this point, the supplied node name is bogus.
 344          */
 345         lprintf(CTDL_ERR, "Invalid node name <%s>\n", node);
 346         return(-1);
 347 }
 348
 349
 350
 351
 352
 353 void cmd_gnet(char *argbuf) {
 354         char filename[SIZ];
 355         char buf[SIZ];
 356         FILE *fp;
 357
 358         if (CtdlAccessCheck(ac_room_aide)) return;
 359         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 360         cprintf("%d Network settings for room #%ld <%s>\n",
 361                 LISTING_FOLLOWS,
 362                 CC->room.QRnumber, CC->room.QRname);
 363
 364         fp = fopen(filename, "r");
 365         if (fp != NULL) {
 366                 while (fgets(buf, sizeof buf, fp) != NULL) {
 367                         buf[strlen(buf)-1] = 0;
 368                         cprintf("%s\n", buf);
 369                 }
 370                 fclose(fp);
 371         }
 372
 373         cprintf("000\n");
 374 }
 375
 376
 377 void cmd_snet(char *argbuf) {
 378         char tempfilename[SIZ];
 379         char filename[SIZ];
 380         char buf[SIZ];
 381         FILE *fp;
 382
 383         unbuffer_output();
 384
 385         if (CtdlAccessCheck(ac_room_aide)) return;
 386         safestrncpy(tempfilename, tmpnam(NULL), sizeof tempfilename);
 387         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 388
 389         fp = fopen(tempfilename, "w");
 390         if (fp == NULL) {
 391                 cprintf("%d Cannot open %s: %s\n",
 392                         ERROR + INTERNAL_ERROR,
 393                         tempfilename,
 394                         strerror(errno));
 395         }
 396
 397         cprintf("%d %s\n", SEND_LISTING, tempfilename);
 398         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 399                 fprintf(fp, "%s\n", buf);
 400         }
 401         fclose(fp);
 402
 403         /* Now copy the temp file to its permanent location
 404          * (We use /bin/mv instead of link() because they may be on
 405          * different filesystems)
 406          */
 407         unlink(filename);
 408         snprintf(buf, sizeof buf, "/bin/mv %s %s", tempfilename, filename);
 409         begin_critical_section(S_NETCONFIGS);
 410         system(buf);
 411         end_critical_section(S_NETCONFIGS);
 412 }
 413
 414
 415 /*
 416  * Spools out one message from the list.
 417  */
 418 void network_spool_msg(long msgnum, void *userdata) {
 419         struct SpoolControl *sc;
 420         int err;
 421         int i;
 422         char *newpath = NULL;
 423         char *instr = NULL;
 424         size_t instr_len = SIZ;
 425         struct CtdlMessage *msg = NULL;
 426         struct CtdlMessage *imsg;
 427         struct namelist *nptr;
 428         struct maplist *mptr;
 429         struct ser_ret sermsg;
 430         FILE *fp;
 431         char filename[SIZ];
 432         char buf[SIZ];
 433         int bang = 0;
 434         int send = 1;
 435         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 436         long list_msgnum = 0L;
 437         int ok_to_participate = 0;
 438         char *end_of_headers = NULL;
 439
 440         sc = (struct SpoolControl *)userdata;
 441
 442         /*
 443          * Process mailing list recipients
 444          */
 445         instr_len = SIZ;
 446         if (sc->listrecps != NULL) {
 447
 448                 /* First, copy it to the spoolout room */
 449                 err = CtdlSaveMsgPointerInRoom(SMTP_SPOOLOUT_ROOM, msgnum, 0);
 450                 if (err != 0) return;
 451
 452                 /*
 453                  * Figure out how big a buffer we need to allocate
 454                  */
 455                 for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 456                         instr_len = instr_len + strlen(nptr->name);
 457                 }
 458
 459                 /*
 460                  * allocate...
 461                  */
 462                 lprintf(CTDL_DEBUG, "Generating delivery instructions\n");
 463                 instr = malloc(instr_len);
 464                 if (instr == NULL) {
 465                         lprintf(CTDL_EMERG,
 466                                 "Cannot allocate %ld bytes for instr...\n",
 467                                 (long)instr_len);
 468                         abort();
 469                 }
 470                 snprintf(instr, instr_len,
 471                         "Content-type: %s\n\nmsgid|%ld\nsubmitted|%ld\n"
 472                         "bounceto|postmaster@%s\n" ,
 473                         SPOOLMIME, msgnum, (long)time(NULL), config.c_fqdn );
 474
 475                 /* Generate delivery instructions for each recipient */
 476                 for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 477                         size_t tmp = strlen(instr);
 478                         snprintf(&instr[tmp], instr_len - tmp,
 479                                  "remote|%s|0||\n", nptr->name);
 480                 }
 481
 482                 /*
 483                  * Generate a message from the instructions
 484                  */
 485                 imsg = malloc(sizeof(struct CtdlMessage));
 486                 memset(imsg, 0, sizeof(struct CtdlMessage));
 487                 imsg->cm_magic = CTDLMESSAGE_MAGIC;
 488                 imsg->cm_anon_type = MES_NORMAL;
 489                 imsg->cm_format_type = FMT_RFC822;
 490                 imsg->cm_fields['A'] = strdup("Citadel");
 491                 imsg->cm_fields['M'] = instr;
 492
 493                 /* Save delivery instructions in spoolout room */
 494                 CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM);
 495                 CtdlFreeMessage(imsg);
 496         }
 497
 498         /*
 499          * Process digest recipients
 500          */
 501         if ((sc->digestrecps != NULL) && (sc->digestfp != NULL)) {
 502                 msg = CtdlFetchMessage(msgnum, 1);
 503                 if (msg != NULL) {
 504                         fprintf(sc->digestfp,   " -----------------------------------"
 505                                                 "------------------------------------"
 506                                                 "-------\n");
 507                         fprintf(sc->digestfp, "From: ");
 508                         if (msg->cm_fields['A'] != NULL) {
 509                                 fprintf(sc->digestfp, "%s ", msg->cm_fields['A']);
 510                         }
 511                         if (msg->cm_fields['F'] != NULL) {
 512                                 fprintf(sc->digestfp, "<%s> ", msg->cm_fields['F']);
 513                         }
 514                         else if (msg->cm_fields['N'] != NULL) {
 515                                 fprintf(sc->digestfp, "@%s ", msg->cm_fields['N']);
 516                         }
 517                         fprintf(sc->digestfp, "\n");
 518                         if (msg->cm_fields['U'] != NULL) {
 519                                 fprintf(sc->digestfp, "Subject: %s\n", msg->cm_fields['U']);
 520                         }
 521
 522                         CC->redirect_buffer = malloc(SIZ);
 523                         CC->redirect_len = 0;
 524                         CC->redirect_alloc = SIZ;
 525
 526                         safestrncpy(CC->preferred_formats, "text/plain", sizeof CC->preferred_formats);
 527                         CtdlOutputPreLoadedMsg(msg, 0L, MT_MIME, HEADERS_NONE, 0, 0);
 528
 529                         end_of_headers = bmstrstr(CC->redirect_buffer, "\n\r\n", strncmp);
 530                         if (end_of_headers == NULL) {
 531                                 end_of_headers = bmstrstr(CC->redirect_buffer, "\n\n", strncmp);
 532                         }
 533                         if (end_of_headers == NULL) {
 534                                 end_of_headers = CC->redirect_buffer;
 535                         }
 536                         striplt(end_of_headers);
 537                         fprintf(sc->digestfp, "\n%s\n", end_of_headers);
 538
 539                         free(CC->redirect_buffer);
 540                         CC->redirect_buffer = NULL;
 541                         CC->redirect_len = 0;
 542                         CC->redirect_alloc = 0;
 543
 544                         sc->num_msgs_spooled += 1;
 545                         free(msg);
 546                 }
 547         }
 548
 549         /*
 550          * Process client-side list participations for this room
 551          */
 552         instr_len = SIZ;
 553         if (sc->participates != NULL) {
 554                 msg = CtdlFetchMessage(msgnum, 1);
 555                 if (msg != NULL) {
 556
 557                         /* Only send messages which originated on our own Citadel
 558                          * network, otherwise we'll end up sending the remote
 559                          * mailing list's messages back to it, which is rude...
 560                          */
 561                         ok_to_participate = 0;
 562                         if (msg->cm_fields['N'] != NULL) {
 563                                 if (!strcasecmp(msg->cm_fields['N'], config.c_nodename)) {
 564                                         ok_to_participate = 1;
 565                                 }
 566                                 if (is_valid_node(NULL, NULL, msg->cm_fields['N']) == 0) {
 567                                         ok_to_participate = 1;
 568                                 }
 569                         }
 570                         if (ok_to_participate) {
 571                                 if (msg->cm_fields['F'] != NULL) {
 572                                         free(msg->cm_fields['F']);
 573                                 }
 574                                 msg->cm_fields['F'] = malloc(SIZ);
 575                                 /* Replace the Internet email address of the actual
 576                                 * author with the email address of the room itself,
 577                                 * so the remote listserv doesn't reject us.
 578                                 * FIXME ... I want to be able to pick any address
 579                                 */
 580                                 snprintf(msg->cm_fields['F'], SIZ,
 581                                         "room_%s@%s", CC->room.QRname,
 582                                         config.c_fqdn);
 583                                 for (i=0; i<strlen(msg->cm_fields['F']); ++i) {
 584                                         if (isspace(msg->cm_fields['F'][i])) {
 585                                                 msg->cm_fields['F'][i] = '_';
 586                                         }
 587                                 }
 588
 589                                 /* Now save it and generate delivery instructions */
 590                                 list_msgnum = CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM);
 591
 592                                 /*
 593                                  * Figure out how big a buffer we need to allocate
 594                                  */
 595                                 for (nptr = sc->participates; nptr != NULL; nptr = nptr->next) {
 596                                         instr_len = instr_len + strlen(nptr->name);
 597                                 }
 598
 599                                 /*
 600                                  * allocate...
 601                                  */
 602                                 instr = malloc(instr_len);
 603                                 if (instr == NULL) {
 604                                         lprintf(CTDL_EMERG,
 605                                                 "Cannot allocate %ld bytes for instr...\n",
 606                                                 (long)instr_len);
 607                                         abort();
 608                                 }
 609                                 snprintf(instr, instr_len,
 610                                         "Content-type: %s\n\nmsgid|%ld\nsubmitted|%ld\n"
 611                                         "bounceto|postmaster@%s\n" ,
 612                                         SPOOLMIME, list_msgnum, (long)time(NULL), config.c_fqdn );
 613
 614                                 /* Generate delivery instructions for each recipient */
 615                                 for (nptr = sc->participates; nptr != NULL; nptr = nptr->next) {
 616                                         size_t tmp = strlen(instr);
 617                                         snprintf(&instr[tmp], instr_len - tmp,
 618                                                  "remote|%s|0||\n", nptr->name);
 619                                 }
 620
 621                                 /*
 622                                  * Generate a message from the instructions
 623                                  */
 624                                 imsg = malloc(sizeof(struct CtdlMessage));
 625                                 memset(imsg, 0, sizeof(struct CtdlMessage));
 626                                 imsg->cm_magic = CTDLMESSAGE_MAGIC;
 627                                 imsg->cm_anon_type = MES_NORMAL;
 628                                 imsg->cm_format_type = FMT_RFC822;
 629                                 imsg->cm_fields['A'] = strdup("Citadel");
 630                                 imsg->cm_fields['M'] = instr;
 631
 632                                 /* Save delivery instructions in spoolout room */
 633                                 CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM);
 634                                 CtdlFreeMessage(imsg);
 635                         }
 636                         CtdlFreeMessage(msg);
 637                 }
 638         }
 639
 640         /*
 641          * Process IGnet push shares
 642          */
 643         if (sc->ignet_push_shares != NULL) {
 644
 645                 msg = CtdlFetchMessage(msgnum, 1);
 646                 if (msg != NULL) {
 647                         size_t newpath_len;
 648
 649                         /* Prepend our node name to the Path field whenever
 650                          * sending a message to another IGnet node
 651                          */
 652                         if (msg->cm_fields['P'] == NULL) {
 653                                 msg->cm_fields['P'] = strdup("username");
 654                         }
 655                         newpath_len = strlen(msg->cm_fields['P']) +
 656                                  strlen(config.c_nodename) + 2;
 657                         newpath = malloc(newpath_len);
 658                         snprintf(newpath, newpath_len, "%s!%s",
 659                                  config.c_nodename, msg->cm_fields['P']);
 660                         free(msg->cm_fields['P']);
 661                         msg->cm_fields['P'] = newpath;
 662
 663                         /*
 664                          * Determine if this message is set to be deleted
 665                          * after sending out on the network
 666                          */
 667                         if (msg->cm_fields['S'] != NULL) {
 668                                 if (!strcasecmp(msg->cm_fields['S'],
 669                                    "CANCEL")) {
 670                                         delete_after_send = 1;
 671                                 }
 672                         }
 673
 674                         /* Now send it to every node */
 675                         for (mptr = sc->ignet_push_shares; mptr != NULL;
 676                             mptr = mptr->next) {
 677
 678                                 send = 1;
 679
 680                                 /* Check for valid node name */
 681                                 if (is_valid_node(NULL, NULL, mptr->remote_nodename) != 0) {
 682                                         lprintf(CTDL_ERR, "Invalid node <%s>\n",
 683                                                 mptr->remote_nodename);
 684                                         send = 0;
 685                                 }
 686
 687                                 /* Check for split horizon */
 688                                 lprintf(CTDL_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 689                                 bang = num_tokens(msg->cm_fields['P'], '!');
 690                                 if (bang > 1) for (i=0; i<(bang-1); ++i) {
 691                                         extract_token(buf, msg->cm_fields['P'],
 692                                                 i, '!', sizeof buf);
 693                                         if (!strcasecmp(buf, mptr->remote_nodename)) {
 694                                                 send = 0;
 695                                         }
 696                                 }
 697
 698                                 /* Send the message */
 699                                 if (send == 1) {
 700
 701                                         /*
 702                                          * Force the message to appear in the correct room
 703                                          * on the far end by setting the C field correctly
 704                                          */
 705                                         if (msg->cm_fields['C'] != NULL) {
 706                                                 free(msg->cm_fields['C']);
 707                                         }
 708                                         if (strlen(mptr->remote_roomname) > 0) {
 709                                                 msg->cm_fields['C'] = strdup(mptr->remote_roomname);
 710                                         }
 711                                         else {
 712                                                 msg->cm_fields['C'] = strdup(CC->room.QRname);
 713                                         }
 714
 715                                         /* serialize it for transmission */
 716                                         serialize_message(&sermsg, msg);
 717
 718                                         /* write it to the spool file */
 719                                         snprintf(filename, sizeof filename,
 720                                                 "./network/spoolout/%s",
 721                                                 mptr->remote_nodename);
 722                                         fp = fopen(filename, "ab");
 723                                         if (fp != NULL) {
 724                                                 fwrite(sermsg.ser,
 725                                                         sermsg.len, 1, fp);
 726                                                 fclose(fp);
 727                                         }
 728
 729                                         /* free the serialized version */
 730                                         free(sermsg.ser);
 731                                 }
 732                         }
 733                         CtdlFreeMessage(msg);
 734                 }
 735         }
 736
 737         /* update lastsent */
 738         sc->lastsent = msgnum;
 739
 740         /* Delete this message if delete-after-send is set */
 741         if (delete_after_send) {
 742                 CtdlDeleteMessages(CC->room.QRname, msgnum, "");
 743         }
 744
 745 }
 746
 747
 748 /*
 749  * Deliver digest messages
 750  */
 751 void network_deliver_digest(struct SpoolControl *sc) {
 752         char buf[SIZ];
 753         int i;
 754         struct CtdlMessage *msg;
 755         long msglen;
 756         long msgnum;
 757         char *instr = NULL;
 758         size_t instr_len = SIZ;
 759         struct CtdlMessage *imsg;
 760         struct namelist *nptr;
 761
 762         if (sc->num_msgs_spooled < 1) {
 763                 fclose(sc->digestfp);
 764                 sc->digestfp = NULL;
 765                 return;
 766         }
 767
 768         msg = malloc(sizeof(struct CtdlMessage));
 769         memset(msg, 0, sizeof(struct CtdlMessage));
 770         msg->cm_magic = CTDLMESSAGE_MAGIC;
 771         msg->cm_format_type = FMT_RFC822;
 772         msg->cm_anon_type = MES_NORMAL;
 773
 774         sprintf(buf, "%ld", time(NULL));
 775         msg->cm_fields['T'] = strdup(buf);
 776         msg->cm_fields['A'] = strdup(CC->room.QRname);
 777         msg->cm_fields['U'] = strdup(CC->room.QRname);
 778         sprintf(buf, "room_%s@%s", CC->room.QRname, config.c_fqdn);
 779         for (i=0; i<strlen(buf); ++i) {
 780                 if (isspace(buf[i])) buf[i]='_';
 781                 buf[i] = tolower(buf[i]);
 782         }
 783         msg->cm_fields['F'] = strdup(buf);
 784
 785         fseek(sc->digestfp, 0L, SEEK_END);
 786         msglen = ftell(sc->digestfp);
 787
 788         msg->cm_fields['M'] = malloc(msglen + 1);
 789         fseek(sc->digestfp, 0L, SEEK_SET);
 790         fread(msg->cm_fields['M'], (size_t)msglen, 1, sc->digestfp);
 791         msg->cm_fields['M'][msglen] = 0;
 792
 793         fclose(sc->digestfp);
 794         sc->digestfp = NULL;
 795
 796         msgnum = CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM);
 797         CtdlFreeMessage(msg);
 798
 799         /* Now generate the delivery instructions */
 800
 801         /*
 802          * Figure out how big a buffer we need to allocate
 803          */
 804         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 805                 instr_len = instr_len + strlen(nptr->name);
 806         }
 807
 808         /*
 809          * allocate...
 810          */
 811         lprintf(CTDL_DEBUG, "Generating delivery instructions\n");
 812         instr = malloc(instr_len);
 813         if (instr == NULL) {
 814                 lprintf(CTDL_EMERG, "Cannot allocate %ld bytes for instr...\n",
 815                         (long)instr_len);
 816                 abort();
 817         }
 818         snprintf(instr, instr_len,
 819                 "Content-type: %s\n\nmsgid|%ld\nsubmitted|%ld\n"
 820                 "bounceto|postmaster@%s\n" ,
 821                 SPOOLMIME, msgnum, (long)time(NULL), config.c_fqdn );
 822
 823         /* Generate delivery instructions for each recipient */
 824         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 825                 size_t tmp = strlen(instr);
 826                 snprintf(&instr[tmp], instr_len - tmp,
 827                          "remote|%s|0||\n", nptr->name);
 828         }
 829
 830         /*
 831          * Generate a message from the instructions
 832          */
 833         imsg = malloc(sizeof(struct CtdlMessage));
 834         memset(imsg, 0, sizeof(struct CtdlMessage));
 835         imsg->cm_magic = CTDLMESSAGE_MAGIC;
 836         imsg->cm_anon_type = MES_NORMAL;
 837         imsg->cm_format_type = FMT_RFC822;
 838         imsg->cm_fields['A'] = strdup("Citadel");
 839         imsg->cm_fields['M'] = instr;
 840
 841         /* Save delivery instructions in spoolout room */
 842         CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM);
 843         CtdlFreeMessage(imsg);
 844 }
 845
 846
 847 /*
 848  * Batch up and send all outbound traffic from the current room
 849  */
 850 void network_spoolout_room(char *room_to_spool) {
 851         char filename[SIZ];
 852         char buf[SIZ];
 853         char instr[SIZ];
 854         char nodename[256];
 855         char roomname[ROOMNAMELEN];
 856         char nexthop[256];
 857         FILE *fp;
 858         struct SpoolControl sc;
 859         struct namelist *nptr = NULL;
 860         struct maplist *mptr = NULL;
 861         size_t miscsize = 0;
 862         size_t linesize = 0;
 863         int skipthisline = 0;
 864         int i;
 865
 866         if (getroom(&CC->room, room_to_spool) != 0) {
 867                 lprintf(CTDL_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
 868                 return;
 869         }
 870
 871         memset(&sc, 0, sizeof(struct SpoolControl));
 872         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
 873
 874         begin_critical_section(S_NETCONFIGS);
 875
 876         fp = fopen(filename, "r");
 877         if (fp == NULL) {
 878                 end_critical_section(S_NETCONFIGS);
 879                 return;
 880         }
 881
 882         lprintf(CTDL_INFO, "Networking started for <%s>\n", CC->room.QRname);
 883
 884         while (fgets(buf, sizeof buf, fp) != NULL) {
 885                 buf[strlen(buf)-1] = 0;
 886
 887                 extract_token(instr, buf, 0, '|', sizeof instr);
 888                 if (!strcasecmp(instr, "lastsent")) {
 889                         sc.lastsent = extract_long(buf, 1);
 890                 }
 891                 else if (!strcasecmp(instr, "listrecp")) {
 892                         nptr = (struct namelist *)
 893                                 malloc(sizeof(struct namelist));
 894                         nptr->next = sc.listrecps;
 895                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 896                         sc.listrecps = nptr;
 897                 }
 898                 else if (!strcasecmp(instr, "participate")) {
 899                         nptr = (struct namelist *)
 900                                 malloc(sizeof(struct namelist));
 901                         nptr->next = sc.participates;
 902                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 903                         sc.participates = nptr;
 904                 }
 905                 else if (!strcasecmp(instr, "digestrecp")) {
 906                         nptr = (struct namelist *)
 907                                 malloc(sizeof(struct namelist));
 908                         nptr->next = sc.digestrecps;
 909                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 910                         sc.digestrecps = nptr;
 911                 }
 912                 else if (!strcasecmp(instr, "ignet_push_share")) {
 913                         /* by checking each node's validity, we automatically
 914                          * purge nodes which do not exist from room network
 915                          * configurations at this time.
 916                          */
 917                         extract_token(nodename, buf, 1, '|', sizeof nodename);
 918                         extract_token(roomname, buf, 2, '|', sizeof roomname);
 919                         strcpy(nexthop, "xxx");
 920                         if (is_valid_node(nexthop, NULL, nodename) == 0) {
 921                                 if (strlen(nexthop) == 0) {
 922                                         mptr = (struct maplist *)
 923                                                 malloc(sizeof(struct maplist));
 924                                         mptr->next = sc.ignet_push_shares;
 925                                         strcpy(mptr->remote_nodename, nodename);
 926                                         strcpy(mptr->remote_roomname, roomname);
 927                                         sc.ignet_push_shares = mptr;
 928                                 }
 929                         }
 930                 }
 931                 else {
 932                         /* Preserve 'other' lines ... *unless* they happen to
 933                          * be subscribe/unsubscribe pendings with expired
 934                          * timestamps.
 935                          */
 936                         skipthisline = 0;
 937                         if (!strncasecmp(buf, "subpending|", 11)) {
 938                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
 939                                         skipthisline = 1;
 940                                 }
 941                         }
 942                         if (!strncasecmp(buf, "unsubpending|", 13)) {
 943                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
 944                                         skipthisline = 1;
 945                                 }
 946                         }
 947
 948                         if (skipthisline == 0) {
 949                                 linesize = strlen(buf);
 950                                 sc.misc = realloc(sc.misc,
 951                                         (miscsize + linesize + 2) );
 952                                 sprintf(&sc.misc[miscsize], "%s\n", buf);
 953                                 miscsize = miscsize + linesize + 1;
 954                         }
 955                 }
 956
 957
 958         }
 959         fclose(fp);
 960
 961         /* If there are digest recipients, we have to build a digest */
 962         if (sc.digestrecps != NULL) {
 963                 sc.digestfp = tmpfile();
 964                 fprintf(sc.digestfp, "Content-type: text/plain\n\n");
 965         }
 966
 967         /* Do something useful */
 968         CtdlForEachMessage(MSGS_GT, sc.lastsent, NULL, NULL,
 969                 network_spool_msg, &sc);
 970
 971         /* If we wrote a digest, deliver it and then close it */
 972         snprintf(buf, sizeof buf, "room_%s@%s",
 973                 CC->room.QRname, config.c_fqdn);
 974         for (i=0; i<strlen(buf); ++i) {
 975                 buf[i] = tolower(buf[i]);
 976                 if (isspace(buf[i])) buf[i] = '_';
 977         }
 978         if (sc.digestfp != NULL) {
 979                 fprintf(sc.digestfp,    " -----------------------------------"
 980                                         "------------------------------------"
 981                                         "-------\n"
 982                                         "You are subscribed to the '%s' "
 983                                         "list.\n"
 984                                         "To post to the list: %s\n",
 985                                         CC->room.QRname, buf
 986                 );
 987                 network_deliver_digest(&sc);    /* deliver and close */
 988         }
 989
 990         /* Now rewrite the config file */
 991         fp = fopen(filename, "w");
 992         if (fp == NULL) {
 993                 lprintf(CTDL_CRIT, "ERROR: cannot open %s: %s\n",
 994                         filename, strerror(errno));
 995         }
 996         else {
 997                 fprintf(fp, "lastsent|%ld\n", sc.lastsent);
 998
 999                 /* Write out the listrecps while freeing from memory at the
1000                  * same time.  Am I clever or what?  :)
1001                  */
1002                 while (sc.listrecps != NULL) {
1003                         fprintf(fp, "listrecp|%s\n", sc.listrecps->name);
1004                         nptr = sc.listrecps->next;
1005                         free(sc.listrecps);
1006                         sc.listrecps = nptr;
1007                 }
1008                 /* Do the same for digestrecps */
1009                 while (sc.digestrecps != NULL) {
1010                         fprintf(fp, "digestrecp|%s\n", sc.digestrecps->name);
1011                         nptr = sc.digestrecps->next;
1012                         free(sc.digestrecps);
1013                         sc.digestrecps = nptr;
1014                 }
1015                 /* Do the same for participates */
1016                 while (sc.participates != NULL) {
1017                         fprintf(fp, "participate|%s\n", sc.participates->name);
1018                         nptr = sc.participates->next;
1019                         free(sc.participates);
1020                         sc.participates = nptr;
1021                 }
1022                 while (sc.ignet_push_shares != NULL) {
1023                         /* by checking each node's validity, we automatically
1024                          * purge nodes which do not exist from room network
1025                          * configurations at this time.
1026                          */
1027                         if (is_valid_node(NULL, NULL, sc.ignet_push_shares->remote_nodename) == 0) {
1028                         }
1029                         fprintf(fp, "ignet_push_share|%s",
1030                                 sc.ignet_push_shares->remote_nodename);
1031                         if (strlen(sc.ignet_push_shares->remote_roomname) > 0) {
1032                                 fprintf(fp, "|%s", sc.ignet_push_shares->remote_roomname);
1033                         }
1034                         fprintf(fp, "\n");
1035                         mptr = sc.ignet_push_shares->next;
1036                         free(sc.ignet_push_shares);
1037                         sc.ignet_push_shares = mptr;
1038                 }
1039                 if (sc.misc != NULL) {
1040                         fwrite(sc.misc, strlen(sc.misc), 1, fp);
1041                 }
1042                 free(sc.misc);
1043
1044                 fclose(fp);
1045         }
1046         end_critical_section(S_NETCONFIGS);
1047 }
1048
1049
1050
1051 /*
1052  * Send the *entire* contents of the current room to one specific network node,
1053  * ignoring anything we know about which messages have already undergone
1054  * network processing.  This can be used to bring a new node into sync.
1055  */
1056 int network_sync_to(char *target_node) {
1057         struct SpoolControl sc;
1058         int num_spooled = 0;
1059         int found_node = 0;
1060         char buf[256];
1061         char sc_type[256];
1062         char sc_node[256];
1063         char sc_room[256];
1064         char filename[256];
1065         FILE *fp;
1066
1067         /* Grab the configuration line we're looking for */
1068         assoc_file_name(filename, sizeof filename, &CC->room, "netconfigs");
1069         begin_critical_section(S_NETCONFIGS);
1070         fp = fopen(filename, "r");
1071         if (fp == NULL) {
1072                 end_critical_section(S_NETCONFIGS);
1073                 return(-1);
1074         }
1075         while (fgets(buf, sizeof buf, fp) != NULL) {
1076                 buf[strlen(buf)-1] = 0;
1077                 extract_token(sc_type, buf, 0, '|', sizeof sc_type);
1078                 extract_token(sc_node, buf, 1, '|', sizeof sc_node);
1079                 extract_token(sc_room, buf, 2, '|', sizeof sc_room);
1080                 if ( (!strcasecmp(sc_type, "ignet_push_share"))
1081                    && (!strcasecmp(sc_node, target_node)) ) {
1082                         found_node = 1;
1083
1084                         /* Concise syntax because we don't need a full linked-list */
1085                         memset(&sc, 0, sizeof(struct SpoolControl));
1086                         sc.ignet_push_shares = (struct maplist *)
1087                                 malloc(sizeof(struct maplist));
1088                         sc.ignet_push_shares->next = NULL;
1089                         safestrncpy(sc.ignet_push_shares->remote_nodename,
1090                                 sc_node,
1091                                 sizeof sc.ignet_push_shares->remote_nodename);
1092                         safestrncpy(sc.ignet_push_shares->remote_roomname,
1093                                 sc_room,
1094                                 sizeof sc.ignet_push_shares->remote_roomname);
1095                 }
1096         }
1097         fclose(fp);
1098         end_critical_section(S_NETCONFIGS);
1099
1100         if (!found_node) return(-1);
1101
1102         /* Send ALL messages */
1103         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL,
1104                 network_spool_msg, &sc);
1105
1106         /* Concise cleanup because we know there's only one node in the sc */
1107         free(sc.ignet_push_shares);
1108
1109         lprintf(CTDL_NOTICE, "Synchronized %d messages to <%s>\n",
1110                 num_spooled, target_node);
1111         return(num_spooled);
1112 }
1113
1114
1115 /*
1116  * Implements the NSYN command
1117  */
1118 void cmd_nsyn(char *argbuf) {
1119         int num_spooled;
1120         char target_node[256];
1121
1122         if (CtdlAccessCheck(ac_aide)) return;
1123
1124         extract_token(target_node, argbuf, 0, '|', sizeof target_node);
1125         num_spooled = network_sync_to(target_node);
1126         if (num_spooled >= 0) {
1127                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
1128         }
1129         else {
1130                 cprintf("%d No such room/node share exists.\n",
1131                         ERROR + ROOM_NOT_FOUND);
1132         }
1133 }
1134
1135
1136
1137 /*
1138  * Batch up and send all outbound traffic from the current room
1139  */
1140 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
1141         struct RoomProcList *ptr;
1142
1143         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
1144         if (ptr == NULL) return;
1145
1146         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
1147         ptr->next = rplist;
1148         rplist = ptr;
1149 }
1150
1151
1152 /*
1153  * Learn topology from path fields
1154  */
1155 void network_learn_topology(char *node, char *path) {
1156         char nexthop[256];
1157         struct NetMap *nmptr;
1158
1159         strcpy(nexthop, "");
1160
1161         if (num_tokens(path, '!') < 3) return;
1162         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
1163                 if (!strcasecmp(nmptr->nodename, node)) {
1164                         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1165                         nmptr->lastcontact = time(NULL);
1166                         return;
1167                 }
1168         }
1169
1170         /* If we got here then it's not in the map, so add it. */
1171         nmptr = (struct NetMap *) malloc(sizeof (struct NetMap));
1172         strcpy(nmptr->nodename, node);
1173         nmptr->lastcontact = time(NULL);
1174         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1175         nmptr->next = the_netmap;
1176         the_netmap = nmptr;
1177 }
1178
1179
1180
1181
1182 /*
1183  * Bounce a message back to the sender
1184  */
1185 void network_bounce(struct CtdlMessage *msg, char *reason) {
1186         char *oldpath = NULL;
1187         char buf[SIZ];
1188         char bouncesource[SIZ];
1189         char recipient[SIZ];
1190         struct recptypes *valid = NULL;
1191         char force_room[ROOMNAMELEN];
1192         static int serialnum = 0;
1193         size_t size;
1194
1195         lprintf(CTDL_DEBUG, "entering network_bounce()\n");
1196
1197         if (msg == NULL) return;
1198
1199         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
1200
1201         /*
1202          * Give it a fresh message ID
1203          */
1204         if (msg->cm_fields['I'] != NULL) {
1205                 free(msg->cm_fields['I']);
1206         }
1207         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
1208                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
1209         msg->cm_fields['I'] = strdup(buf);
1210
1211         /*
1212          * FIXME ... right now we're just sending a bounce; we really want to
1213          * include the text of the bounced message.
1214          */
1215         if (msg->cm_fields['M'] != NULL) {
1216                 free(msg->cm_fields['M']);
1217         }
1218         msg->cm_fields['M'] = strdup(reason);
1219         msg->cm_format_type = 0;
1220
1221         /*
1222          * Turn the message around
1223          */
1224         if (msg->cm_fields['R'] == NULL) {
1225                 free(msg->cm_fields['R']);
1226         }
1227
1228         if (msg->cm_fields['D'] == NULL) {
1229                 free(msg->cm_fields['D']);
1230         }
1231
1232         snprintf(recipient, sizeof recipient, "%s@%s",
1233                 msg->cm_fields['A'], msg->cm_fields['N']);
1234
1235         if (msg->cm_fields['A'] == NULL) {
1236                 free(msg->cm_fields['A']);
1237         }
1238
1239         if (msg->cm_fields['N'] == NULL) {
1240                 free(msg->cm_fields['N']);
1241         }
1242
1243         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1244         msg->cm_fields['N'] = strdup(config.c_nodename);
1245
1246
1247         /* prepend our node to the path */
1248         if (msg->cm_fields['P'] != NULL) {
1249                 oldpath = msg->cm_fields['P'];
1250                 msg->cm_fields['P'] = NULL;
1251         }
1252         else {
1253                 oldpath = strdup("unknown_user");
1254         }
1255         size = strlen(oldpath) + SIZ;
1256         msg->cm_fields['P'] = malloc(size);
1257         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1258         free(oldpath);
1259
1260         /* Now submit the message */
1261         valid = validate_recipients(recipient);
1262         if (valid != NULL) if (valid->num_error > 0) {
1263                 free(valid);
1264                 valid = NULL;
1265         }
1266         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1267                 strcpy(force_room, config.c_aideroom);
1268         }
1269         else {
1270                 strcpy(force_room, "");
1271         }
1272         if ( (valid == NULL) && (strlen(force_room) == 0) ) {
1273                 strcpy(force_room, config.c_aideroom);
1274         }
1275         CtdlSubmitMsg(msg, valid, force_room);
1276
1277         /* Clean up */
1278         if (valid != NULL) free(valid);
1279         CtdlFreeMessage(msg);
1280         lprintf(CTDL_DEBUG, "leaving network_bounce()\n");
1281 }
1282
1283
1284
1285
1286 /*
1287  * Process a buffer containing a single message from a single file
1288  * from the inbound queue
1289  */
1290 void network_process_buffer(char *buffer, long size) {
1291         struct CtdlMessage *msg;
1292         long pos;
1293         int field;
1294         struct recptypes *recp = NULL;
1295         char target_room[ROOMNAMELEN];
1296         struct ser_ret sermsg;
1297         char *oldpath = NULL;
1298         char filename[SIZ];
1299         FILE *fp;
1300         char nexthop[SIZ];
1301         unsigned char firstbyte;
1302         unsigned char lastbyte;
1303
1304         /* Validate just a little bit.  First byte should be FF and
1305          * last byte should be 00.
1306          */
1307         memcpy(&firstbyte, &buffer[0], 1);
1308         memcpy(&lastbyte, &buffer[size-1], 1);
1309         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1310                 lprintf(CTDL_ERR, "Corrupt message!  Ignoring.\n");
1311                 return;
1312         }
1313
1314         /* Set default target room to trash */
1315         strcpy(target_room, TWITROOM);
1316
1317         /* Load the message into memory */
1318         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1319         memset(msg, 0, sizeof(struct CtdlMessage));
1320         msg->cm_magic = CTDLMESSAGE_MAGIC;
1321         msg->cm_anon_type = buffer[1];
1322         msg->cm_format_type = buffer[2];
1323
1324         for (pos = 3; pos < size; ++pos) {
1325                 field = buffer[pos];
1326                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1327                 pos = pos + strlen(&buffer[(int)pos]);
1328         }
1329
1330         /* Check for message routing */
1331         if (msg->cm_fields['D'] != NULL) {
1332                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1333
1334                         /* route the message */
1335                         strcpy(nexthop, "");
1336                         if (is_valid_node(nexthop, NULL,
1337                            msg->cm_fields['D']) == 0) {
1338
1339                                 /* prepend our node to the path */
1340                                 if (msg->cm_fields['P'] != NULL) {
1341                                         oldpath = msg->cm_fields['P'];
1342                                         msg->cm_fields['P'] = NULL;
1343                                 }
1344                                 else {
1345                                         oldpath = strdup("unknown_user");
1346                                 }
1347                                 size = strlen(oldpath) + SIZ;
1348                                 msg->cm_fields['P'] = malloc(size);
1349                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1350                                         config.c_nodename, oldpath);
1351                                 free(oldpath);
1352
1353                                 /* serialize the message */
1354                                 serialize_message(&sermsg, msg);
1355
1356                                 /* now send it */
1357                                 if (strlen(nexthop) == 0) {
1358                                         strcpy(nexthop, msg->cm_fields['D']);
1359                                 }
1360                                 snprintf(filename, sizeof filename,
1361                                         "./network/spoolout/%s", nexthop);
1362                                 fp = fopen(filename, "ab");
1363                                 if (fp != NULL) {
1364                                         fwrite(sermsg.ser,
1365                                                 sermsg.len, 1, fp);
1366                                         fclose(fp);
1367                                 }
1368                                 free(sermsg.ser);
1369                                 CtdlFreeMessage(msg);
1370                                 return;
1371                         }
1372
1373                         else {  /* invalid destination node name */
1374
1375                                 network_bounce(msg,
1376 "A message you sent could not be delivered due to an invalid destination node"
1377 " name.  Please check the address and try sending the message again.\n");
1378                                 msg = NULL;
1379                                 return;
1380
1381                         }
1382                 }
1383         }
1384
1385         /*
1386          * Check to see if we already have a copy of this message, and
1387          * abort its processing if so.  (We used to post a warning to Aide>
1388          * every time this happened, but the network is now so densely
1389          * connected that it's inevitable.)
1390          */
1391         if (network_usetable(msg) != 0) {
1392                 return;
1393         }
1394
1395         /* Learn network topology from the path */
1396         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1397                 network_learn_topology(msg->cm_fields['N'],
1398                                         msg->cm_fields['P']);
1399         }
1400
1401         /* Is the sending node giving us a very persuasive suggestion about
1402          * which room this message should be saved in?  If so, go with that.
1403          */
1404         if (msg->cm_fields['C'] != NULL) {
1405                 safestrncpy(target_room,
1406                         msg->cm_fields['C'],
1407                         sizeof target_room);
1408         }
1409
1410         /* Otherwise, does it have a recipient?  If so, validate it... */
1411         else if (msg->cm_fields['R'] != NULL) {
1412                 recp = validate_recipients(msg->cm_fields['R']);
1413                 if (recp != NULL) if (recp->num_error > 0) {
1414                         network_bounce(msg,
1415 "A message you sent could not be delivered due to an invalid address.\n"
1416 "Please check the address and try sending the message again.\n");
1417                         msg = NULL;
1418                         free(recp);
1419                         return;
1420                 }
1421                 strcpy(target_room, "");        /* no target room if mail */
1422         }
1423
1424         /* Our last shot at finding a home for this message is to see if
1425          * it has the O field (Originating room) set.
1426          */
1427         else if (msg->cm_fields['O'] != NULL) {
1428                 safestrncpy(target_room,
1429                         msg->cm_fields['O'],
1430                         sizeof target_room);
1431         }
1432
1433         /* Strip out fields that are only relevant during transit */
1434         if (msg->cm_fields['D'] != NULL) {
1435                 free(msg->cm_fields['D']);
1436                 msg->cm_fields['D'] = NULL;
1437         }
1438         if (msg->cm_fields['C'] != NULL) {
1439                 free(msg->cm_fields['C']);
1440                 msg->cm_fields['C'] = NULL;
1441         }
1442
1443         /* save the message into a room */
1444         if (PerformNetprocHooks(msg, target_room) == 0) {
1445                 msg->cm_flags = CM_SKIP_HOOKS;
1446                 CtdlSubmitMsg(msg, recp, target_room);
1447         }
1448         CtdlFreeMessage(msg);
1449         free(recp);
1450 }
1451
1452
1453 /*
1454  * Process a single message from a single file from the inbound queue
1455  */
1456 void network_process_message(FILE *fp, long msgstart, long msgend) {
1457         long hold_pos;
1458         long size;
1459         char *buffer;
1460
1461         hold_pos = ftell(fp);
1462         size = msgend - msgstart + 1;
1463         buffer = malloc(size);
1464         if (buffer != NULL) {
1465                 fseek(fp, msgstart, SEEK_SET);
1466                 fread(buffer, size, 1, fp);
1467                 network_process_buffer(buffer, size);
1468                 free(buffer);
1469         }
1470
1471         fseek(fp, hold_pos, SEEK_SET);
1472 }
1473
1474
1475 /*
1476  * Process a single file from the inbound queue
1477  */
1478 void network_process_file(char *filename) {
1479         FILE *fp;
1480         long msgstart = (-1L);
1481         long msgend = (-1L);
1482         long msgcur = 0L;
1483         int ch;
1484
1485
1486         fp = fopen(filename, "rb");
1487         if (fp == NULL) {
1488                 lprintf(CTDL_CRIT, "Error opening %s: %s\n",
1489                         filename, strerror(errno));
1490                 return;
1491         }
1492
1493         lprintf(CTDL_INFO, "network: processing <%s>\n", filename);
1494
1495         /* Look for messages in the data stream and break them out */
1496         while (ch = getc(fp), ch >= 0) {
1497
1498                 if (ch == 255) {
1499                         if (msgstart >= 0L) {
1500                                 msgend = msgcur - 1;
1501                                 network_process_message(fp, msgstart, msgend);
1502                         }
1503                         msgstart = msgcur;
1504                 }
1505
1506                 ++msgcur;
1507         }
1508
1509         msgend = msgcur - 1;
1510         if (msgstart >= 0L) {
1511                 network_process_message(fp, msgstart, msgend);
1512         }
1513
1514         fclose(fp);
1515         unlink(filename);
1516 }
1517
1518
1519 /*
1520  * Process anything in the inbound queue
1521  */
1522 void network_do_spoolin(void) {
1523         DIR *dp;
1524         struct dirent *d;
1525         char filename[SIZ];
1526
1527         dp = opendir("./network/spoolin");
1528         if (dp == NULL) return;
1529
1530         while (d = readdir(dp), d != NULL) {
1531                 snprintf(filename, sizeof filename,
1532                         "./network/spoolin/%s", d->d_name);
1533                 network_process_file(filename);
1534         }
1535
1536
1537         closedir(dp);
1538 }
1539
1540
1541 /*
1542  * Delete any files in the outbound queue that were intended
1543  * to be sent to nodes which no longer exist.
1544  */
1545 void network_purge_spoolout(void) {
1546         DIR *dp;
1547         struct dirent *d;
1548         char filename[SIZ];
1549         char nexthop[SIZ];
1550         int i;
1551
1552         dp = opendir("./network/spoolout");
1553         if (dp == NULL) return;
1554
1555         while (d = readdir(dp), d != NULL) {
1556                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
1557                         continue;
1558                 snprintf(filename, sizeof filename,
1559                         "./network/spoolout/%s", d->d_name);
1560
1561                 strcpy(nexthop, "");
1562                 i = is_valid_node(nexthop, NULL, d->d_name);
1563
1564                 if ( (i != 0) || (strlen(nexthop) > 0) ) {
1565                         unlink(filename);
1566                 }
1567         }
1568
1569
1570         closedir(dp);
1571 }
1572
1573
1574
1575 /*
1576  * receive network spool from the remote system
1577  */
1578 void receive_spool(int sock, char *remote_nodename) {
1579         long download_len;
1580         long bytes_received;
1581         char buf[SIZ];
1582         static char pbuf[IGNET_PACKET_SIZE];
1583         char tempfilename[PATH_MAX];
1584         long plen;
1585         FILE *fp;
1586
1587         strcpy(tempfilename, tmpnam(NULL));
1588         if (sock_puts(sock, "NDOP") < 0) return;
1589         if (sock_gets(sock, buf) < 0) return;
1590         lprintf(CTDL_DEBUG, "<%s\n", buf);
1591         if (buf[0] != '2') {
1592                 return;
1593         }
1594         download_len = extract_long(&buf[4], 0);
1595
1596         bytes_received = 0L;
1597         fp = fopen(tempfilename, "w");
1598         if (fp == NULL) {
1599                 lprintf(CTDL_CRIT, "cannot open download file locally: %s\n",
1600                         strerror(errno));
1601                 return;
1602         }
1603
1604         while (bytes_received < download_len) {
1605                 snprintf(buf, sizeof buf, "READ %ld|%ld",
1606                         bytes_received,
1607                      ((download_len - bytes_received > IGNET_PACKET_SIZE)
1608                  ? IGNET_PACKET_SIZE : (download_len - bytes_received)));
1609                 if (sock_puts(sock, buf) < 0) {
1610                         fclose(fp);
1611                         unlink(tempfilename);
1612                         return;
1613                 }
1614                 if (sock_gets(sock, buf) < 0) {
1615                         fclose(fp);
1616                         unlink(tempfilename);
1617                         return;
1618                 }
1619                 if (buf[0] == '6') {
1620                         plen = extract_long(&buf[4], 0);
1621                         if (sock_read(sock, pbuf, plen) < 0) {
1622                                 fclose(fp);
1623                                 unlink(tempfilename);
1624                                 return;
1625                         }
1626                         fwrite((char *) pbuf, plen, 1, fp);
1627                         bytes_received = bytes_received + plen;
1628                 }
1629         }
1630
1631         fclose(fp);
1632         if (sock_puts(sock, "CLOS") < 0) {
1633                 unlink(tempfilename);
1634                 return;
1635         }
1636         if (sock_gets(sock, buf) < 0) {
1637                 unlink(tempfilename);
1638                 return;
1639         }
1640         if (download_len > 0)
1641                 lprintf(CTDL_NOTICE, "Received %ld octets from <%s>",
1642                                 download_len, remote_nodename);
1643         lprintf(CTDL_DEBUG, "%s", buf);
1644         snprintf(buf, sizeof buf, "mv %s ./network/spoolin/%s.%ld",
1645                 tempfilename, remote_nodename, (long) getpid());
1646         system(buf);
1647 }
1648
1649
1650
1651 /*
1652  * transmit network spool to the remote system
1653  */
1654 void transmit_spool(int sock, char *remote_nodename)
1655 {
1656         char buf[SIZ];
1657         char pbuf[4096];
1658         long plen;
1659         long bytes_to_write, thisblock, bytes_written;
1660         int fd;
1661         char sfname[128];
1662
1663         if (sock_puts(sock, "NUOP") < 0) return;
1664         if (sock_gets(sock, buf) < 0) return;
1665         lprintf(CTDL_DEBUG, "<%s\n", buf);
1666         if (buf[0] != '2') {
1667                 return;
1668         }
1669
1670         snprintf(sfname, sizeof sfname, "./network/spoolout/%s", remote_nodename);
1671         fd = open(sfname, O_RDONLY);
1672         if (fd < 0) {
1673                 if (errno != ENOENT) {
1674                         lprintf(CTDL_CRIT, "cannot open upload file locally: %s\n",
1675                                 strerror(errno));
1676                 }
1677                 return;
1678         }
1679         bytes_written = 0;
1680         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
1681                 bytes_to_write = plen;
1682                 while (bytes_to_write > 0L) {
1683                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
1684                         if (sock_puts(sock, buf) < 0) {
1685                                 close(fd);
1686                                 return;
1687                         }
1688                         if (sock_gets(sock, buf) < 0) {
1689                                 close(fd);
1690                                 return;
1691                         }
1692                         thisblock = atol(&buf[4]);
1693                         if (buf[0] == '7') {
1694                                 if (sock_write(sock, pbuf,
1695                                    (int) thisblock) < 0) {
1696                                         close(fd);
1697                                         return;
1698                                 }
1699                                 bytes_to_write -= thisblock;
1700                                 bytes_written += thisblock;
1701                         } else {
1702                                 goto ABORTUPL;
1703                         }
1704                 }
1705         }
1706
1707 ABORTUPL:
1708         close(fd);
1709         if (sock_puts(sock, "UCLS 1") < 0) return;
1710         if (sock_gets(sock, buf) < 0) return;
1711         lprintf(CTDL_NOTICE, "Sent %ld octets to <%s>",
1712                         bytes_written, remote_nodename);
1713         lprintf(CTDL_DEBUG, "<%s\n", buf);
1714         if (buf[0] == '2') {
1715                 unlink(sfname);
1716         }
1717 }
1718
1719
1720
1721 /*
1722  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
1723  */
1724 void network_poll_node(char *node, char *secret, char *host, char *port) {
1725         int sock;
1726         char buf[SIZ];
1727
1728         if (network_talking_to(node, NTT_CHECK)) return;
1729         network_talking_to(node, NTT_ADD);
1730         lprintf(CTDL_NOTICE, "Connecting to <%s> at %s:%s\n", node, host, port);
1731
1732         sock = sock_connect(host, port, "tcp");
1733         if (sock < 0) {
1734                 lprintf(CTDL_ERR, "Could not connect: %s\n", strerror(errno));
1735                 network_talking_to(node, NTT_REMOVE);
1736                 return;
1737         }
1738
1739         lprintf(CTDL_DEBUG, "Connected!\n");
1740
1741         /* Read the server greeting */
1742         if (sock_gets(sock, buf) < 0) goto bail;
1743         lprintf(CTDL_DEBUG, ">%s\n", buf);
1744
1745         /* Identify ourselves */
1746         snprintf(buf, sizeof buf, "NETP %s|%s", config.c_nodename, secret);
1747         lprintf(CTDL_DEBUG, "<%s\n", buf);
1748         if (sock_puts(sock, buf) <0) goto bail;
1749         if (sock_gets(sock, buf) < 0) goto bail;
1750         lprintf(CTDL_DEBUG, ">%s\n", buf);
1751         if (buf[0] != '2') goto bail;
1752
1753         /* At this point we are authenticated. */
1754         receive_spool(sock, node);
1755         transmit_spool(sock, node);
1756
1757         sock_puts(sock, "QUIT");
1758 bail:   sock_close(sock);
1759         network_talking_to(node, NTT_REMOVE);
1760 }
1761
1762
1763
1764 /*
1765  * Poll other Citadel nodes and transfer inbound/outbound network data.
1766  * Set "full" to nonzero to force a poll of every node, or to zero to poll
1767  * only nodes to which we have data to send.
1768  */
1769 void network_poll_other_citadel_nodes(int full_poll) {
1770         int i;
1771         char linebuf[256];
1772         char node[SIZ];
1773         char host[256];
1774         char port[256];
1775         char secret[256];
1776         int poll = 0;
1777         char spoolfile[256];
1778
1779         if (working_ignetcfg == NULL) {
1780                 lprintf(CTDL_DEBUG, "No nodes defined - not polling\n");
1781                 return;
1782         }
1783
1784         /* Use the string tokenizer to grab one line at a time */
1785         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
1786                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
1787                 extract_token(node, linebuf, 0, '|', sizeof node);
1788                 extract_token(secret, linebuf, 1, '|', sizeof secret);
1789                 extract_token(host, linebuf, 2, '|', sizeof host);
1790                 extract_token(port, linebuf, 3, '|', sizeof port);
1791                 if ( (strlen(node) > 0) && (strlen(secret) > 0)
1792                    && (strlen(host) > 0) && strlen(port) > 0) {
1793                         poll = full_poll;
1794                         if (poll == 0) {
1795                                 snprintf(spoolfile, sizeof spoolfile,
1796                                         "./network/spoolout/%s", node);
1797                                 if (access(spoolfile, R_OK) == 0) {
1798                                         poll = 1;
1799                                 }
1800                         }
1801                         if (poll) {
1802                                 network_poll_node(node, secret, host, port);
1803                         }
1804                 }
1805         }
1806
1807 }
1808
1809
1810
1811
1812
1813
1814
1815 /*
1816  * network_do_queue()
1817  *
1818  * Run through the rooms doing various types of network stuff.
1819  */
1820 void network_do_queue(void) {
1821         static time_t last_run = 0L;
1822         struct RoomProcList *ptr;
1823         int full_processing = 1;
1824
1825         /*
1826          * Run the full set of processing tasks no more frequently
1827          * than once every n seconds
1828          */
1829         if ( (time(NULL) - last_run) < config.c_net_freq ) {
1830                 full_processing = 0;
1831         }
1832
1833         /*
1834          * This is a simple concurrency check to make sure only one queue run
1835          * is done at a time.  We could do this with a mutex, but since we
1836          * don't really require extremely fine granularity here, we'll do it
1837          * with a static variable instead.
1838          */
1839         if (doing_queue) return;
1840         doing_queue = 1;
1841
1842         /* Load the IGnet Configuration into memory */
1843         load_working_ignetcfg();
1844
1845         /*
1846          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
1847          * then we poll everyone.  Otherwise we only poll nodes we have stuff
1848          * to send to.
1849          */
1850         network_poll_other_citadel_nodes(full_processing);
1851
1852         /*
1853          * Load the network map and filter list into memory.
1854          */
1855         read_network_map();
1856         filterlist = load_filter_list();
1857
1858         /*
1859          * Go ahead and run the queue
1860          */
1861         if (full_processing) {
1862                 lprintf(CTDL_DEBUG, "network: loading outbound queue\n");
1863                 ForEachRoom(network_queue_room, NULL);
1864
1865                 lprintf(CTDL_DEBUG, "network: running outbound queue\n");
1866                 while (rplist != NULL) {
1867                         network_spoolout_room(rplist->name);
1868                         ptr = rplist;
1869                         rplist = rplist->next;
1870                         free(ptr);
1871                 }
1872         }
1873
1874         lprintf(CTDL_DEBUG, "network: processing inbound queue\n");
1875         network_do_spoolin();
1876
1877         /* Save the network map back to disk */
1878         write_network_map();
1879
1880         /* Free the filter list in memory */
1881         free_filter_list(filterlist);
1882         filterlist = NULL;
1883
1884         network_purge_spoolout();
1885
1886         lprintf(CTDL_DEBUG, "network: queue run completed\n");
1887
1888         if (full_processing) {
1889                 last_run = time(NULL);
1890         }
1891
1892         doing_queue = 0;
1893 }
1894
1895
1896 /*
1897  * cmd_netp() - authenticate to the server as another Citadel node polling
1898  *            for network traffic
1899  */
1900 void cmd_netp(char *cmdbuf)
1901 {
1902         char node[256];
1903         char pass[256];
1904         int v;
1905
1906         char secret[256];
1907         char nexthop[256];
1908
1909         /* Authenticate */
1910         extract_token(node, cmdbuf, 0, '|', sizeof node);
1911         extract_token(pass, cmdbuf, 1, '|', sizeof pass);
1912
1913         if (doing_queue) {
1914                 lprintf(CTDL_WARNING, "Network node <%s> refused - spooling", node);
1915                 cprintf("%d spooling - try again in a few minutes\n",
1916                         ERROR + RESOURCE_BUSY);
1917                 return;
1918         }
1919
1920         /* load the IGnet Configuration to check node validity */
1921         load_working_ignetcfg();
1922         v = is_valid_node(nexthop, secret, node);
1923
1924         if (v != 0) {
1925                 lprintf(CTDL_WARNING, "Unknown node <%s>\n", node);
1926                 cprintf("%d authentication failed\n",
1927                         ERROR + PASSWORD_REQUIRED);
1928                 return;
1929         }
1930
1931         if (strcasecmp(pass, secret)) {
1932                 lprintf(CTDL_WARNING, "Bad password for network node <%s>", node);
1933                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
1934                 return;
1935         }
1936
1937         if (network_talking_to(node, NTT_CHECK)) {
1938                 lprintf(CTDL_WARNING, "Duplicate session for network node <%s>", node);
1939                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
1940                 return;
1941         }
1942
1943         safestrncpy(CC->net_node, node, sizeof CC->net_node);
1944         network_talking_to(node, NTT_ADD);
1945         lprintf(CTDL_NOTICE, "Network node <%s> logged in\n", CC->net_node);
1946         cprintf("%d authenticated as network node '%s'\n", CIT_OK,
1947                 CC->net_node);
1948 }
1949
1950
1951
1952 /*
1953  * Module entry point
1954  */
1955 char *serv_network_init(void)
1956 {
1957         CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
1958         CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
1959         CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
1960         CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
1961         CtdlRegisterSessionHook(network_do_queue, EVT_TIMER);
1962         return "$Id$";
1963 }