citadel/serv_network.c

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