citadel/serv_network.c

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