citadel/modules/network/serv_network.c

   1 /*
   2  * This module handles shared rooms, inter-Citadel mail, and outbound
   3  * mailing list processing.
   4  *
   5  * Copyright (c) 2000-2010 by the citadel.org team
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 3 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  22  * This is a fairly high-level type of critical section.  It ensures that no
  23  * two threads work on the netconfigs files at the same time.  Since we do
  24  * so many things inside these, here are the rules:
  25  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  26  *  2. Do *not* perform any I/O with the client during these sections.
  27  *
  28  */
  29
  30 /*
  31  * Duration of time (in seconds) after which pending list subscribe/unsubscribe
  32  * requests that have not been confirmed will be deleted.
  33  */
  34 #define EXP     259200  /* three days */
  35
  36 #include "sysdep.h"
  37 #include <stdlib.h>
  38 #include <unistd.h>
  39 #include <stdio.h>
  40 #include <fcntl.h>
  41 #include <ctype.h>
  42 #include <signal.h>
  43 #include <pwd.h>
  44 #include <errno.h>
  45 #include <sys/stat.h>
  46 #include <sys/types.h>
  47 #include <dirent.h>
  48 #if TIME_WITH_SYS_TIME
  49 # include <sys/time.h>
  50 # include <time.h>
  51 #else
  52 # if HAVE_SYS_TIME_H
  53 #  include <sys/time.h>
  54 # else
  55 #  include <time.h>
  56 # endif
  57 #endif
  58 #ifdef HAVE_SYSCALL_H
  59 # include <syscall.h>
  60 #else
  61 # if HAVE_SYS_SYSCALL_H
  62 #  include <sys/syscall.h>
  63 # endif
  64 #endif
  65
  66 #include <sys/wait.h>
  67 #include <string.h>
  68 #include <limits.h>
  69 #include <libcitadel.h>
  70 #include "citadel.h"
  71 #include "server.h"
  72 #include "citserver.h"
  73 #include "support.h"
  74 #include "config.h"
  75 #include "user_ops.h"
  76 #include "database.h"
  77 #include "msgbase.h"
  78 #include "internet_addressing.h"
  79 #include "serv_network.h"
  80 #include "clientsocket.h"
  81 #include "file_ops.h"
  82 #include "citadel_dirs.h"
  83 #include "threads.h"
  84
  85 #ifndef HAVE_SNPRINTF
  86 #include "snprintf.h"
  87 #endif
  88
  89 #include "context.h"
  90
  91 #include "ctdl_module.h"
  92
  93
  94
  95 /* Nonzero while we are doing network processing */
  96 static int doing_queue = 0;
  97
  98 /*
  99  * When we do network processing, it's accomplished in two passes; one to
 100  * gather a list of rooms and one to actually do them.  It's ok that rplist
 101  * is global; we have a mutex that keeps it safe.
 102  */
 103 struct RoomProcList *rplist = NULL;
 104
 105 /*
 106  * We build a map of network nodes during processing.
 107  */
 108 NetMap *the_netmap = NULL;
 109 int netmap_changed = 0;
 110 char *working_ignetcfg = NULL;
 111
 112 /*
 113  * Load or refresh the Citadel network (IGnet) configuration for this node.
 114  */
 115 void load_working_ignetcfg(void) {
 116         char *cfg;
 117         char *oldcfg;
 118
 119         cfg = CtdlGetSysConfig(IGNETCFG);
 120         if (cfg == NULL) {
 121                 cfg = strdup("");
 122         }
 123
 124         oldcfg = working_ignetcfg;
 125         working_ignetcfg = cfg;
 126         if (oldcfg != NULL) {
 127                 free(oldcfg);
 128         }
 129 }
 130
 131
 132
 133
 134
 135 /*
 136  * Keep track of what messages to reject
 137  */
 138 FilterList *load_filter_list(void) {
 139         char *serialized_list = NULL;
 140         int i;
 141         char buf[SIZ];
 142         FilterList *newlist = NULL;
 143         FilterList *nptr;
 144
 145         serialized_list = CtdlGetSysConfig(FILTERLIST);
 146         if (serialized_list == NULL) return(NULL); /* if null, no entries */
 147
 148         /* Use the string tokenizer to grab one line at a time */
 149         for (i=0; i<num_tokens(serialized_list, '\n'); ++i) {
 150                 extract_token(buf, serialized_list, i, '\n', sizeof buf);
 151                 nptr = (FilterList *) malloc(sizeof(FilterList));
 152                 extract_token(nptr->fl_user, buf, 0, '|', sizeof nptr->fl_user);
 153                 striplt(nptr->fl_user);
 154                 extract_token(nptr->fl_room, buf, 1, '|', sizeof nptr->fl_room);
 155                 striplt(nptr->fl_room);
 156                 extract_token(nptr->fl_node, buf, 2, '|', sizeof nptr->fl_node);
 157                 striplt(nptr->fl_node);
 158
 159                 /* Cowardly refuse to add an any/any/any entry that would
 160                  * end up filtering every single message.
 161                  */
 162                 if (IsEmptyStr(nptr->fl_user) &&
 163                     IsEmptyStr(nptr->fl_room) &&
 164                     IsEmptyStr(nptr->fl_node)) {
 165                         free(nptr);
 166                 }
 167                 else {
 168                         nptr->next = newlist;
 169                         newlist = nptr;
 170                 }
 171         }
 172
 173         free(serialized_list);
 174         return newlist;
 175 }
 176
 177
 178 void free_filter_list(FilterList *fl) {
 179         if (fl == NULL) return;
 180         free_filter_list(fl->next);
 181         free(fl);
 182 }
 183
 184
 185
 186 /*
 187  * Check the use table.  This is a list of messages which have recently
 188  * arrived on the system.  It is maintained and queried to prevent the same
 189  * message from being entered into the database multiple times if it happens
 190  * to arrive multiple times by accident.
 191  */
 192 int network_usetable(struct CtdlMessage *msg) {
 193
 194         char msgid[SIZ];
 195         struct cdbdata *cdbut;
 196         struct UseTable ut;
 197
 198         /* Bail out if we can't generate a message ID */
 199         if (msg == NULL) {
 200                 return(0);
 201         }
 202         if (msg->cm_fields['I'] == NULL) {
 203                 return(0);
 204         }
 205         if (IsEmptyStr(msg->cm_fields['I'])) {
 206                 return(0);
 207         }
 208
 209         /* Generate the message ID */
 210         strcpy(msgid, msg->cm_fields['I']);
 211         if (haschar(msgid, '@') == 0) {
 212                 strcat(msgid, "@");
 213                 if (msg->cm_fields['N'] != NULL) {
 214                         strcat(msgid, msg->cm_fields['N']);
 215                 }
 216                 else {
 217                         return(0);
 218                 }
 219         }
 220
 221         cdbut = cdb_fetch(CDB_USETABLE, msgid, strlen(msgid));
 222         if (cdbut != NULL) {
 223                 cdb_free(cdbut);
 224                 CtdlLogPrintf(CTDL_DEBUG, "network_usetable() : we already have %s\n", msgid);
 225                 return(1);
 226         }
 227
 228         /* If we got to this point, it's unique: add it. */
 229         strcpy(ut.ut_msgid, msgid);
 230         ut.ut_timestamp = time(NULL);
 231         cdb_store(CDB_USETABLE, msgid, strlen(msgid), &ut, sizeof(struct UseTable) );
 232         return(0);
 233 }
 234
 235
 236 /*
 237  * Read the network map from its configuration file into memory.
 238  */
 239 void read_network_map(void) {
 240         char *serialized_map = NULL;
 241         int i;
 242         char buf[SIZ];
 243         NetMap *nmptr;
 244
 245         serialized_map = CtdlGetSysConfig(IGNETMAP);
 246         if (serialized_map == NULL) return;     /* if null, no entries */
 247
 248         /* Use the string tokenizer to grab one line at a time */
 249         for (i=0; i<num_tokens(serialized_map, '\n'); ++i) {
 250                 extract_token(buf, serialized_map, i, '\n', sizeof buf);
 251                 nmptr = (NetMap *) malloc(sizeof(NetMap));
 252                 extract_token(nmptr->nodename, buf, 0, '|', sizeof nmptr->nodename);
 253                 nmptr->lastcontact = extract_long(buf, 1);
 254                 extract_token(nmptr->nexthop, buf, 2, '|', sizeof nmptr->nexthop);
 255                 nmptr->next = the_netmap;
 256                 the_netmap = nmptr;
 257         }
 258
 259         free(serialized_map);
 260         netmap_changed = 0;
 261 }
 262
 263
 264 /*
 265  * Write the network map from memory back to the configuration file.
 266  */
 267 void write_network_map(void) {
 268         char *serialized_map = NULL;
 269         NetMap *nmptr;
 270
 271
 272         if (netmap_changed) {
 273                 serialized_map = strdup("");
 274
 275                 if (the_netmap != NULL) {
 276                         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 277                                 serialized_map = realloc(serialized_map,
 278                                                         (strlen(serialized_map)+SIZ) );
 279                                 if (!IsEmptyStr(nmptr->nodename)) {
 280                                         snprintf(&serialized_map[strlen(serialized_map)],
 281                                                 SIZ,
 282                                                 "%s|%ld|%s\n",
 283                                                 nmptr->nodename,
 284                                                 (long)nmptr->lastcontact,
 285                                                 nmptr->nexthop);
 286                                 }
 287                         }
 288                 }
 289
 290                 CtdlPutSysConfig(IGNETMAP, serialized_map);
 291                 free(serialized_map);
 292         }
 293
 294         /* Now free the list */
 295         while (the_netmap != NULL) {
 296                 nmptr = the_netmap->next;
 297                 free(the_netmap);
 298                 the_netmap = nmptr;
 299         }
 300         netmap_changed = 0;
 301 }
 302
 303
 304
 305 /*
 306  * Check the network map and determine whether the supplied node name is
 307  * valid.  If it is not a neighbor node, supply the name of a neighbor node
 308  * which is the next hop.  If it *is* a neighbor node, we also fill in the
 309  * shared secret.
 310  */
 311 int is_valid_node(char *nexthop, char *secret, char *node) {
 312         int i;
 313         char linebuf[SIZ];
 314         char buf[SIZ];
 315         int retval;
 316         NetMap *nmptr;
 317
 318         if (node == NULL) {
 319                 return(-1);
 320         }
 321
 322         /*
 323          * First try the neighbor nodes
 324          */
 325         if (working_ignetcfg == NULL) {
 326                 CtdlLogPrintf(CTDL_ERR, "working_ignetcfg is NULL!\n");
 327                 if (nexthop != NULL) {
 328                         strcpy(nexthop, "");
 329                 }
 330                 return(-1);
 331         }
 332
 333         retval = (-1);
 334         if (nexthop != NULL) {
 335                 strcpy(nexthop, "");
 336         }
 337
 338         /* Use the string tokenizer to grab one line at a time */
 339         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
 340                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
 341                 extract_token(buf, linebuf, 0, '|', sizeof buf);
 342                 if (!strcasecmp(buf, node)) {
 343                         if (nexthop != NULL) {
 344                                 strcpy(nexthop, "");
 345                         }
 346                         if (secret != NULL) {
 347                                 extract_token(secret, linebuf, 1, '|', 256);
 348                         }
 349                         retval = 0;
 350                 }
 351         }
 352
 353         if (retval == 0) {
 354                 return(retval);         /* yup, it's a direct neighbor */
 355         }
 356
 357         /*
 358          * If we get to this point we have to see if we know the next hop
 359          */
 360         if (the_netmap != NULL) {
 361                 for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 362                         if (!strcasecmp(nmptr->nodename, node)) {
 363                                 if (nexthop != NULL) {
 364                                         strcpy(nexthop, nmptr->nexthop);
 365                                 }
 366                                 return(0);
 367                         }
 368                 }
 369         }
 370
 371         /*
 372          * If we get to this point, the supplied node name is bogus.
 373          */
 374         CtdlLogPrintf(CTDL_ERR, "Invalid node name <%s>\n", node);
 375         return(-1);
 376 }
 377
 378
 379
 380
 381
 382 void cmd_gnet(char *argbuf) {
 383         char filename[PATH_MAX];
 384         char buf[SIZ];
 385         FILE *fp;
 386
 387         if ( (CC->room.QRflags & QR_MAILBOX) && (CC->user.usernum == atol(CC->room.QRname)) ) {
 388                 /* users can edit the netconfigs for their own mailbox rooms */
 389         }
 390         else if (CtdlAccessCheck(ac_room_aide)) return;
 391
 392         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 393         cprintf("%d Network settings for room #%ld <%s>\n",
 394                 LISTING_FOLLOWS,
 395                 CC->room.QRnumber, CC->room.QRname);
 396
 397         fp = fopen(filename, "r");
 398         if (fp != NULL) {
 399                 while (fgets(buf, sizeof buf, fp) != NULL) {
 400                         buf[strlen(buf)-1] = 0;
 401                         cprintf("%s\n", buf);
 402                 }
 403                 fclose(fp);
 404         }
 405
 406         cprintf("000\n");
 407 }
 408
 409
 410 void cmd_snet(char *argbuf) {
 411         char tempfilename[PATH_MAX];
 412         char filename[PATH_MAX];
 413         int TmpFD;
 414         StrBuf *Line;
 415         struct stat StatBuf;
 416         long len;
 417         int rc;
 418
 419         unbuffer_output();
 420
 421         if ( (CC->room.QRflags & QR_MAILBOX) && (CC->user.usernum == atol(CC->room.QRname)) ) {
 422                 /* users can edit the netconfigs for their own mailbox rooms */
 423         }
 424         else if (CtdlAccessCheck(ac_room_aide)) return;
 425
 426         len = assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 427         memcpy(tempfilename, filename, len + 1);
 428
 429         memset(&StatBuf, 0, sizeof(struct stat));
 430         if ((stat(filename, &StatBuf)  == -1) || (StatBuf.st_size == 0))
 431                 StatBuf.st_size = 80; /* Not there or empty? guess 80 chars line. */
 432
 433         sprintf(tempfilename + len, ".%d", CC->cs_pid);
 434         errno = 0;
 435         TmpFD = open(tempfilename, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
 436
 437         if ((TmpFD > 0) && (errno == 0))
 438         {
 439                 char *tmp = malloc(StatBuf.st_size * 2);
 440                 memset(tmp, ' ', StatBuf.st_size * 2);
 441                 rc = write(TmpFD, tmp, StatBuf.st_size * 2);
 442                 free(tmp);
 443                 if ((rc <= 0) || (rc != StatBuf.st_size * 2))
 444                 {
 445                         close(TmpFD);
 446                         cprintf("%d Unable to allocate the space required for %s: %s\n",
 447                                 ERROR + INTERNAL_ERROR,
 448                                 tempfilename,
 449                                 strerror(errno));
 450                         unlink(tempfilename);
 451                         return;
 452                 }
 453                 lseek(TmpFD, SEEK_SET, 0);
 454         }
 455         else {
 456                 cprintf("%d Unable to allocate the space required for %s: %s\n",
 457                         ERROR + INTERNAL_ERROR,
 458                         tempfilename,
 459                         strerror(errno));
 460                 unlink(tempfilename);
 461                 return;
 462         }
 463         Line = NewStrBuf();
 464
 465         cprintf("%d %s\n", SEND_LISTING, tempfilename);
 466
 467         len = 0;
 468         while (rc = CtdlClientGetLine(Line),
 469                (rc >= 0))
 470         {
 471                 if ((rc == 3) && (strcmp(ChrPtr(Line), "000") == 0))
 472                         break;
 473                 StrBufAppendBufPlain(Line, HKEY("\n"), 0);
 474                 write(TmpFD, ChrPtr(Line), StrLength(Line));
 475                 len += StrLength(Line);
 476         }
 477         FreeStrBuf(&Line);
 478         ftruncate(TmpFD, len);
 479         close(TmpFD);
 480
 481         /* Now copy the temp file to its permanent location.
 482          * (We copy instead of link because they may be on different filesystems)
 483          */
 484         begin_critical_section(S_NETCONFIGS);
 485         rename(tempfilename, filename);
 486         end_critical_section(S_NETCONFIGS);
 487 }
 488
 489
 490 /*
 491  * Deliver digest messages
 492  */
 493 void network_deliver_digest(SpoolControl *sc) {
 494         char buf[SIZ];
 495         int i;
 496         struct CtdlMessage *msg = NULL;
 497         long msglen;
 498         char *recps = NULL;
 499         size_t recps_len = SIZ;
 500         size_t siz;
 501         struct recptypes *valid;
 502         namelist *nptr;
 503         char bounce_to[256];
 504
 505         if (sc->num_msgs_spooled < 1) {
 506                 fclose(sc->digestfp);
 507                 sc->digestfp = NULL;
 508                 return;
 509         }
 510
 511         msg = malloc(sizeof(struct CtdlMessage));
 512         memset(msg, 0, sizeof(struct CtdlMessage));
 513         msg->cm_magic = CTDLMESSAGE_MAGIC;
 514         msg->cm_format_type = FMT_RFC822;
 515         msg->cm_anon_type = MES_NORMAL;
 516
 517         sprintf(buf, "%ld", time(NULL));
 518         msg->cm_fields['T'] = strdup(buf);
 519         msg->cm_fields['A'] = strdup(CC->room.QRname);
 520         snprintf(buf, sizeof buf, "[%s]", CC->room.QRname);
 521         msg->cm_fields['U'] = strdup(buf);
 522         sprintf(buf, "room_%s@%s", CC->room.QRname, config.c_fqdn);
 523         for (i=0; buf[i]; ++i) {
 524                 if (isspace(buf[i])) buf[i]='_';
 525                 buf[i] = tolower(buf[i]);
 526         }
 527         msg->cm_fields['F'] = strdup(buf);
 528         msg->cm_fields['R'] = strdup(buf);
 529
 530         /* Set the 'List-ID' header */
 531         msg->cm_fields['L'] = malloc(1024);
 532         snprintf(msg->cm_fields['L'], 1024,
 533                 "%s <%ld.list-id.%s>",
 534                 CC->room.QRname,
 535                 CC->room.QRnumber,
 536                 config.c_fqdn
 537         );
 538
 539         /*
 540          * Go fetch the contents of the digest
 541          */
 542         fseek(sc->digestfp, 0L, SEEK_END);
 543         msglen = ftell(sc->digestfp);
 544
 545         msg->cm_fields['M'] = malloc(msglen + 1);
 546         fseek(sc->digestfp, 0L, SEEK_SET);
 547         siz = fread(msg->cm_fields['M'], (size_t)msglen, 1, sc->digestfp);
 548         msg->cm_fields['M'][msglen] = '\0';
 549
 550         fclose(sc->digestfp);
 551         sc->digestfp = NULL;
 552
 553         /* Now generate the delivery instructions */
 554
 555         /*
 556          * Figure out how big a buffer we need to allocate
 557          */
 558         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 559                 recps_len = recps_len + strlen(nptr->name) + 2;
 560         }
 561
 562         recps = malloc(recps_len);
 563
 564         if (recps == NULL) {
 565                 CtdlLogPrintf(CTDL_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 566                 abort();
 567         }
 568
 569         strcpy(recps, "");
 570
 571         /* Each recipient */
 572         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 573                 if (nptr != sc->digestrecps) {
 574                         strcat(recps, ",");
 575                 }
 576                 strcat(recps, nptr->name);
 577         }
 578
 579         /* Where do we want bounces and other noise to be heard?  Surely not the list members! */
 580         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 581
 582         /* Now submit the message */
 583         valid = validate_recipients(recps, NULL, 0);
 584         free(recps);
 585         if (valid != NULL) {
 586                 valid->bounce_to = strdup(bounce_to);
 587                 valid->envelope_from = strdup(bounce_to);
 588                 CtdlSubmitMsg(msg, valid, NULL, 0);
 589         }
 590         CtdlFreeMessage(msg);
 591         free_recipients(valid);
 592 }
 593
 594
 595 /*
 596  * Deliver list messages to everyone on the list ... efficiently
 597  */
 598 void network_deliver_list(struct CtdlMessage *msg, SpoolControl *sc) {
 599         char *recps = NULL;
 600         size_t recps_len = SIZ;
 601         struct recptypes *valid;
 602         namelist *nptr;
 603         char bounce_to[256];
 604
 605         /* Don't do this if there were no recipients! */
 606         if (sc->listrecps == NULL) return;
 607
 608         /* Now generate the delivery instructions */
 609
 610         /*
 611          * Figure out how big a buffer we need to allocate
 612          */
 613         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 614                 recps_len = recps_len + strlen(nptr->name) + 2;
 615         }
 616
 617         recps = malloc(recps_len);
 618
 619         if (recps == NULL) {
 620                 CtdlLogPrintf(CTDL_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 621                 abort();
 622         }
 623
 624         strcpy(recps, "");
 625
 626         /* Each recipient */
 627         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 628                 if (nptr != sc->listrecps) {
 629                         strcat(recps, ",");
 630                 }
 631                 strcat(recps, nptr->name);
 632         }
 633
 634         /* Where do we want bounces and other noise to be heard?  Surely not the list members! */
 635         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 636
 637         /* Now submit the message */
 638         valid = validate_recipients(recps, NULL, 0);
 639         free(recps);
 640         if (valid != NULL) {
 641                 valid->bounce_to = strdup(bounce_to);
 642                 valid->envelope_from = strdup(bounce_to);
 643                 CtdlSubmitMsg(msg, valid, NULL, 0);
 644                 free_recipients(valid);
 645         }
 646         /* Do not call CtdlFreeMessage(msg) here; the caller will free it. */
 647 }
 648
 649
 650
 651
 652 /*
 653  * Spools out one message from the list.
 654  */
 655 void network_spool_msg(long msgnum, void *userdata) {
 656         SpoolControl *sc;
 657         int i;
 658         char *newpath = NULL;
 659         size_t instr_len = SIZ;
 660         struct CtdlMessage *msg = NULL;
 661         namelist *nptr;
 662         maplist *mptr;
 663         struct ser_ret sermsg;
 664         FILE *fp;
 665         char filename[PATH_MAX];
 666         char buf[SIZ];
 667         int bang = 0;
 668         int send = 1;
 669         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 670         int ok_to_participate = 0;
 671         struct recptypes *valid;
 672
 673         sc = (SpoolControl *)userdata;
 674
 675         /*
 676          * Process mailing list recipients
 677          */
 678         instr_len = SIZ;
 679         if (sc->listrecps != NULL) {
 680                 /* Fetch the message.  We're going to need to modify it
 681                  * in order to insert the [list name] in it, etc.
 682                  */
 683                 msg = CtdlFetchMessage(msgnum, 1);
 684                 if (msg != NULL) {
 685                         int len, rlen;
 686                         char *pCh;
 687
 688                         if (msg->cm_fields['V'] == NULL){
 689                                 /* local message, no enVelope */
 690                                 StrBuf *Buf;
 691                                 Buf = NewStrBuf();
 692                                 StrBufAppendBufPlain(Buf, msg->cm_fields['O'], -1, 0);
 693                                 StrBufAppendBufPlain(Buf, HKEY("@"), 0);
 694                                 StrBufAppendBufPlain(Buf, config.c_fqdn, -1, 0);
 695
 696                                 msg->cm_fields['K'] = SmashStrBuf(&Buf);
 697                         }
 698                         else {
 699                                 msg->cm_fields['K'] = strdup (msg->cm_fields['V']);
 700                         }
 701                         /* Set the 'List-ID' header */
 702                         if (msg->cm_fields['L'] != NULL) {
 703                                 free(msg->cm_fields['L']);
 704                         }
 705                         msg->cm_fields['L'] = malloc(1024);
 706                         snprintf(msg->cm_fields['L'], 1024,
 707                                 "%s <%ld.list-id.%s>",
 708                                 CC->room.QRname,
 709                                 CC->room.QRnumber,
 710                                 config.c_fqdn
 711                         );
 712
 713                         /* Prepend "[List name]" to the subject */
 714                         if (msg->cm_fields['U'] == NULL) {
 715                                 msg->cm_fields['U'] = strdup("(no subject)");
 716                         }
 717
 718                         len  = strlen(msg->cm_fields['U']);
 719                         rlen = strlen(CC->room.QRname);
 720                         pCh  = strstr(msg->cm_fields['U'], CC->room.QRname);
 721                         if ((pCh == NULL) ||
 722                             (*(pCh + rlen) != ']') ||
 723                             (pCh == msg->cm_fields['U']) ||
 724                             (*(pCh - 1) != '[')
 725                                 )
 726                         {
 727                                 char *pBuff;
 728
 729                                 rlen += len + 4;
 730                                 pBuff = malloc (rlen * sizeof(char));
 731
 732                                 snprintf(pBuff, rlen, "[%s] %s", CC->room.QRname, msg->cm_fields['U']);
 733                                 free(msg->cm_fields['U']);
 734                                 msg->cm_fields['U'] = pBuff;
 735                         }
 736                         /* else we won't modify the buffer, since the roomname is already here. */
 737
 738                         /* if we don't already have a 'reply to' field, put our roomname in. */
 739                         if (msg->cm_fields['K'] == NULL) {
 740                                 msg->cm_fields['K'] = malloc(256);
 741                                 snprintf(msg->cm_fields['K'], 256,
 742                                          "room_%s@%s", CC->room.QRname,
 743                                          config.c_fqdn);
 744                                 for (i=0; msg->cm_fields['K'][i]; ++i) {
 745                                         if (isspace(msg->cm_fields['K'][i])) {
 746                                                 msg->cm_fields['K'][i] = '_';
 747                                         }
 748                                 }
 749                         }
 750
 751                         /* Handle delivery */
 752                         network_deliver_list(msg, sc);
 753                         CtdlFreeMessage(msg);
 754                 }
 755         }
 756
 757         /*
 758          * Process digest recipients
 759          */
 760         if ((sc->digestrecps != NULL) && (sc->digestfp != NULL)) {
 761                 msg = CtdlFetchMessage(msgnum, 1);
 762                 if (msg != NULL) {
 763                         fprintf(sc->digestfp,   " -----------------------------------"
 764                                                 "------------------------------------"
 765                                                 "-------\n");
 766                         fprintf(sc->digestfp, "From: ");
 767                         if (msg->cm_fields['A'] != NULL) {
 768                                 fprintf(sc->digestfp, "%s ", msg->cm_fields['A']);
 769                         }
 770                         if (msg->cm_fields['F'] != NULL) {
 771                                 fprintf(sc->digestfp, "<%s> ", msg->cm_fields['F']);
 772                         }
 773                         else if (msg->cm_fields['N'] != NULL) {
 774                                 fprintf(sc->digestfp, "@%s ", msg->cm_fields['N']);
 775                         }
 776                         fprintf(sc->digestfp, "\n");
 777                         if (msg->cm_fields['U'] != NULL) {
 778                                 fprintf(sc->digestfp, "Subject: %s\n", msg->cm_fields['U']);
 779                         }
 780
 781                         CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 782
 783                         safestrncpy(CC->preferred_formats, "text/plain", sizeof CC->preferred_formats);
 784                         CtdlOutputPreLoadedMsg(msg, MT_CITADEL, HEADERS_NONE, 0, 0, 0);
 785
 786                         StrBufTrim(CC->redirect_buffer);
 787                         fwrite(HKEY("\n"), 1, sc->digestfp);
 788                         fwrite(SKEY(CC->redirect_buffer), 1, sc->digestfp);
 789                         fwrite(HKEY("\n"), 1, sc->digestfp);
 790
 791                         FreeStrBuf(&CC->redirect_buffer);
 792
 793                         sc->num_msgs_spooled += 1;
 794                         free(msg);
 795                 }
 796         }
 797
 798         /*
 799          * Process client-side list participations for this room
 800          */
 801         instr_len = SIZ;
 802         if (sc->participates != NULL) {
 803                 msg = CtdlFetchMessage(msgnum, 1);
 804                 if (msg != NULL) {
 805
 806                         /* Only send messages which originated on our own Citadel
 807                          * network, otherwise we'll end up sending the remote
 808                          * mailing list's messages back to it, which is rude...
 809                          */
 810                         ok_to_participate = 0;
 811                         if (msg->cm_fields['N'] != NULL) {
 812                                 if (!strcasecmp(msg->cm_fields['N'], config.c_nodename)) {
 813                                         ok_to_participate = 1;
 814                                 }
 815                                 if (is_valid_node(NULL, NULL, msg->cm_fields['N']) == 0) {
 816                                         ok_to_participate = 1;
 817                                 }
 818                         }
 819                         if (ok_to_participate) {
 820                                 if (msg->cm_fields['F'] != NULL) {
 821                                         free(msg->cm_fields['F']);
 822                                 }
 823                                 msg->cm_fields['F'] = malloc(SIZ);
 824                                 /* Replace the Internet email address of the actual
 825                                 * author with the email address of the room itself,
 826                                 * so the remote listserv doesn't reject us.
 827                                 * FIXME ... I want to be able to pick any address
 828                                 */
 829                                 snprintf(msg->cm_fields['F'], SIZ,
 830                                         "room_%s@%s", CC->room.QRname,
 831                                         config.c_fqdn);
 832                                 for (i=0; msg->cm_fields['F'][i]; ++i) {
 833                                         if (isspace(msg->cm_fields['F'][i])) {
 834                                                 msg->cm_fields['F'][i] = '_';
 835                                         }
 836                                 }
 837
 838                                 /*
 839                                  * Figure out how big a buffer we need to allocate
 840                                  */
 841                                 for (nptr = sc->participates; nptr != NULL; nptr = nptr->next) {
 842
 843                                         if (msg->cm_fields['R'] == NULL) {
 844                                                 free(msg->cm_fields['R']);
 845                                         }
 846                                         msg->cm_fields['R'] = strdup(nptr->name);
 847
 848                                         valid = validate_recipients(nptr->name, NULL, 0);
 849                                         CtdlSubmitMsg(msg, valid, "", 0);
 850                                         free_recipients(valid);
 851                                 }
 852
 853                         }
 854                         CtdlFreeMessage(msg);
 855                 }
 856         }
 857
 858         /*
 859          * Process IGnet push shares
 860          */
 861         msg = CtdlFetchMessage(msgnum, 1);
 862         if (msg != NULL) {
 863                 size_t newpath_len;
 864
 865                 /* Prepend our node name to the Path field whenever
 866                  * sending a message to another IGnet node
 867                  */
 868                 if (msg->cm_fields['P'] == NULL) {
 869                         msg->cm_fields['P'] = strdup("username");
 870                 }
 871                 newpath_len = strlen(msg->cm_fields['P']) +
 872                          strlen(config.c_nodename) + 2;
 873                 newpath = malloc(newpath_len);
 874                 snprintf(newpath, newpath_len, "%s!%s",
 875                          config.c_nodename, msg->cm_fields['P']);
 876                 free(msg->cm_fields['P']);
 877                 msg->cm_fields['P'] = newpath;
 878
 879                 /*
 880                  * Determine if this message is set to be deleted
 881                  * after sending out on the network
 882                  */
 883                 if (msg->cm_fields['S'] != NULL) {
 884                         if (!strcasecmp(msg->cm_fields['S'], "CANCEL")) {
 885                                 delete_after_send = 1;
 886                         }
 887                 }
 888
 889                 /* Now send it to every node */
 890                 if (sc->ignet_push_shares != NULL)
 891                   for (mptr = sc->ignet_push_shares; mptr != NULL;
 892                     mptr = mptr->next) {
 893
 894                         send = 1;
 895
 896                         /* Check for valid node name */
 897                         if (is_valid_node(NULL, NULL, mptr->remote_nodename) != 0) {
 898                                 CtdlLogPrintf(CTDL_ERR, "Invalid node <%s>\n", mptr->remote_nodename);
 899                                 send = 0;
 900                         }
 901
 902                         /* Check for split horizon */
 903                         CtdlLogPrintf(CTDL_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 904                         bang = num_tokens(msg->cm_fields['P'], '!');
 905                         if (bang > 1) for (i=0; i<(bang-1); ++i) {
 906                                 extract_token(buf, msg->cm_fields['P'], i, '!', sizeof buf);
 907                                 CtdlLogPrintf(CTDL_DEBUG, "Compare <%s> to <%s>\n",
 908                                         buf, mptr->remote_nodename) ;
 909                                 if (!strcasecmp(buf, mptr->remote_nodename)) {
 910                                         send = 0;
 911                                         CtdlLogPrintf(CTDL_DEBUG, "Not sending to %s\n",
 912                                                 mptr->remote_nodename);
 913                                 }
 914                                 else {
 915                                         CtdlLogPrintf(CTDL_DEBUG, "Sending to %s\n", mptr->remote_nodename);
 916                                 }
 917                         }
 918
 919                         /* Send the message */
 920                         if (send == 1) {
 921
 922                                 /*
 923                                  * Force the message to appear in the correct room
 924                                  * on the far end by setting the C field correctly
 925                                  */
 926                                 if (msg->cm_fields['C'] != NULL) {
 927                                         free(msg->cm_fields['C']);
 928                                 }
 929                                 if (!IsEmptyStr(mptr->remote_roomname)) {
 930                                         msg->cm_fields['C'] = strdup(mptr->remote_roomname);
 931                                 }
 932                                 else {
 933                                         msg->cm_fields['C'] = strdup(CC->room.QRname);
 934                                 }
 935
 936                                 /* serialize it for transmission */
 937                                 serialize_message(&sermsg, msg);
 938                                 if (sermsg.len > 0) {
 939
 940                                         /* write it to a spool file */
 941                                         snprintf(filename, sizeof filename,"%s/%s@%lx%x",
 942                                                 ctdl_netout_dir,
 943                                                 mptr->remote_nodename,
 944                                                 time(NULL),
 945                                                 rand()
 946                                         );
 947                                         CtdlLogPrintf(CTDL_DEBUG, "Appending to %s\n", filename);
 948                                         fp = fopen(filename, "ab");
 949                                         if (fp != NULL) {
 950                                                 fwrite(sermsg.ser,
 951                                                         sermsg.len, 1, fp);
 952                                                 fclose(fp);
 953                                         }
 954                                         else {
 955                                                 CtdlLogPrintf(CTDL_ERR, "%s: %s\n", filename, strerror(errno));
 956                                         }
 957
 958                                         /* free the serialized version */
 959                                         free(sermsg.ser);
 960                                 }
 961
 962                         }
 963                 }
 964                 CtdlFreeMessage(msg);
 965         }
 966
 967         /* update lastsent */
 968         sc->lastsent = msgnum;
 969
 970         /* Delete this message if delete-after-send is set */
 971         if (delete_after_send) {
 972                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 973         }
 974
 975 }
 976
 977
 978 int read_spoolcontrol_file(SpoolControl **scc, char *filename)
 979 {
 980         FILE *fp;
 981         char instr[SIZ];
 982         char buf[SIZ];
 983         char nodename[256];
 984         char roomname[ROOMNAMELEN];
 985         size_t miscsize = 0;
 986         size_t linesize = 0;
 987         int skipthisline = 0;
 988         namelist *nptr = NULL;
 989         maplist *mptr = NULL;
 990         SpoolControl *sc;
 991
 992         fp = fopen(filename, "r");
 993         if (fp == NULL) {
 994                 return 0;
 995         }
 996         sc = malloc(sizeof(SpoolControl));
 997         memset(sc, 0, sizeof(SpoolControl));
 998         *scc = sc;
 999
1000         while (fgets(buf, sizeof buf, fp) != NULL) {
1001                 buf[strlen(buf)-1] = 0;
1002
1003                 extract_token(instr, buf, 0, '|', sizeof instr);
1004                 if (!strcasecmp(instr, strof(lastsent))) {
1005                         sc->lastsent = extract_long(buf, 1);
1006                 }
1007                 else if (!strcasecmp(instr, strof(listrecp))) {
1008                         nptr = (namelist *)
1009                                 malloc(sizeof(namelist));
1010                         nptr->next = sc->listrecps;
1011                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
1012                         sc->listrecps = nptr;
1013                 }
1014                 else if (!strcasecmp(instr, strof(participate))) {
1015                         nptr = (namelist *)
1016                                 malloc(sizeof(namelist));
1017                         nptr->next = sc->participates;
1018                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
1019                         sc->participates = nptr;
1020                 }
1021                 else if (!strcasecmp(instr, strof(digestrecp))) {
1022                         nptr = (namelist *)
1023                                 malloc(sizeof(namelist));
1024                         nptr->next = sc->digestrecps;
1025                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
1026                         sc->digestrecps = nptr;
1027                 }
1028                 else if (!strcasecmp(instr, strof(ignet_push_share))) {
1029                         extract_token(nodename, buf, 1, '|', sizeof nodename);
1030                         extract_token(roomname, buf, 2, '|', sizeof roomname);
1031                         mptr = (maplist *) malloc(sizeof(maplist));
1032                         mptr->next = sc->ignet_push_shares;
1033                         strcpy(mptr->remote_nodename, nodename);
1034                         strcpy(mptr->remote_roomname, roomname);
1035                         sc->ignet_push_shares = mptr;
1036                 }
1037                 else {
1038                         /* Preserve 'other' lines ... *unless* they happen to
1039                          * be subscribe/unsubscribe pendings with expired
1040                          * timestamps.
1041                          */
1042                         skipthisline = 0;
1043                         if (!strncasecmp(buf, strof(subpending)"|", 11)) {
1044                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
1045                                         skipthisline = 1;
1046                                 }
1047                         }
1048                         if (!strncasecmp(buf, strof(unsubpending)"|", 13)) {
1049                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
1050                                         skipthisline = 1;
1051                                 }
1052                         }
1053
1054                         if (skipthisline == 0) {
1055                                 linesize = strlen(buf);
1056                                 sc->misc = realloc(sc->misc,
1057                                         (miscsize + linesize + 2) );
1058                                 sprintf(&sc->misc[miscsize], "%s\n", buf);
1059                                 miscsize = miscsize + linesize + 1;
1060                         }
1061                 }
1062
1063
1064         }
1065         fclose(fp);
1066         return 1;
1067 }
1068
1069 void free_spoolcontrol_struct(SpoolControl **scc)
1070 {
1071         SpoolControl *sc;
1072         namelist *nptr = NULL;
1073         maplist *mptr = NULL;
1074
1075         sc = *scc;
1076         while (sc->listrecps != NULL) {
1077                 nptr = sc->listrecps->next;
1078                 free(sc->listrecps);
1079                 sc->listrecps = nptr;
1080         }
1081         /* Do the same for digestrecps */
1082         while (sc->digestrecps != NULL) {
1083                 nptr = sc->digestrecps->next;
1084                 free(sc->digestrecps);
1085                 sc->digestrecps = nptr;
1086         }
1087         /* Do the same for participates */
1088         while (sc->participates != NULL) {
1089                 nptr = sc->participates->next;
1090                 free(sc->participates);
1091                 sc->participates = nptr;
1092         }
1093         while (sc->ignet_push_shares != NULL) {
1094                 mptr = sc->ignet_push_shares->next;
1095                 free(sc->ignet_push_shares);
1096                 sc->ignet_push_shares = mptr;
1097         }
1098         free(sc->misc);
1099         free(sc);
1100         *scc=NULL;
1101 }
1102
1103 int writenfree_spoolcontrol_file(SpoolControl **scc, char *filename)
1104 {
1105         char tempfilename[PATH_MAX];
1106         int TmpFD;
1107         SpoolControl *sc;
1108         namelist *nptr = NULL;
1109         maplist *mptr = NULL;
1110         long len;
1111         time_t unixtime;
1112         struct timeval tv;
1113         long reltid; /* if we don't have SYS_gettid, use "random" value */
1114         StrBuf *Cfg;
1115         int rc;
1116
1117         len = strlen(filename);
1118         memcpy(tempfilename, filename, len + 1);
1119
1120
1121 #if defined(HAVE_SYSCALL_H) && defined (SYS_gettid)
1122         reltid = syscall(SYS_gettid);
1123 #endif
1124         gettimeofday(&tv, NULL);
1125         /* Promote to time_t; types differ on some OSes (like darwin) */
1126         unixtime = tv.tv_sec;
1127
1128         sprintf(tempfilename + len, ".%ld-%ld", reltid, unixtime);
1129         sc = *scc;
1130         errno = 0;
1131         TmpFD = open(tempfilename, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
1132         Cfg = NewStrBuf();
1133         if ((TmpFD < 0) || (errno != 0)) {
1134                 CtdlLogPrintf(CTDL_CRIT, "ERROR: cannot open %s: %s\n",
1135                         filename, strerror(errno));
1136                 free_spoolcontrol_struct(scc);
1137                 unlink(tempfilename);
1138         }
1139         else {
1140                 StrBufAppendPrintf(Cfg, "lastsent|%ld\n", sc->lastsent);
1141
1142                 /* Write out the listrecps while freeing from memory at the
1143                  * same time.  Am I clever or what?  :)
1144                  */
1145                 while (sc->listrecps != NULL) {
1146                         StrBufAppendPrintf(Cfg, "listrecp|%s\n", sc->listrecps->name);
1147                         nptr = sc->listrecps->next;
1148                         free(sc->listrecps);
1149                         sc->listrecps = nptr;
1150                 }
1151                 /* Do the same for digestrecps */
1152                 while (sc->digestrecps != NULL) {
1153                         StrBufAppendPrintf(Cfg, "digestrecp|%s\n", sc->digestrecps->name);
1154                         nptr = sc->digestrecps->next;
1155                         free(sc->digestrecps);
1156                         sc->digestrecps = nptr;
1157                 }
1158                 /* Do the same for participates */
1159                 while (sc->participates != NULL) {
1160                         StrBufAppendPrintf(Cfg, "participate|%s\n", sc->participates->name);
1161                         nptr = sc->participates->next;
1162                         free(sc->participates);
1163                         sc->participates = nptr;
1164                 }
1165                 while (sc->ignet_push_shares != NULL) {
1166                         StrBufAppendPrintf(Cfg, "ignet_push_share|%s", sc->ignet_push_shares->remote_nodename);
1167                         if (!IsEmptyStr(sc->ignet_push_shares->remote_roomname)) {
1168                                 StrBufAppendPrintf(Cfg, "|%s", sc->ignet_push_shares->remote_roomname);
1169                         }
1170                         StrBufAppendPrintf(Cfg, "\n");
1171                         mptr = sc->ignet_push_shares->next;
1172                         free(sc->ignet_push_shares);
1173                         sc->ignet_push_shares = mptr;
1174                 }
1175                 if (sc->misc != NULL) {
1176                         StrBufAppendBufPlain(Cfg, sc->misc, -1, 0);
1177                 }
1178                 free(sc->misc);
1179
1180                 rc = write(TmpFD, ChrPtr(Cfg), StrLength(Cfg));
1181                 if ((rc >=0 ) && (rc == StrLength(Cfg)))
1182                 {
1183                         close(TmpFD);
1184                         rename(tempfilename, filename);
1185                 }
1186                 else {
1187                         CtdlLogPrintf(CTDL_EMERG,
1188                                       "unable to write %s; [%s]; not enough space on the disk?\n",
1189                                       tempfilename,
1190                                       strerror(errno));
1191                         close(TmpFD);
1192                         unlink(tempfilename);
1193                 }
1194                 FreeStrBuf(&Cfg);
1195                 free(sc);
1196                 *scc=NULL;
1197         }
1198         return 1;
1199 }
1200 int is_recipient(SpoolControl *sc, const char *Name)
1201 {
1202         namelist *nptr;
1203         size_t len;
1204
1205         len = strlen(Name);
1206         nptr = sc->listrecps;
1207         while (nptr != NULL) {
1208                 if (strncmp(Name, nptr->name, len)==0)
1209                         return 1;
1210                 nptr = nptr->next;
1211         }
1212         /* Do the same for digestrecps */
1213         nptr = sc->digestrecps;
1214         while (nptr != NULL) {
1215                 if (strncmp(Name, nptr->name, len)==0)
1216                         return 1;
1217                 nptr = nptr->next;
1218         }
1219         /* Do the same for participates */
1220         nptr = sc->participates;
1221         while (nptr != NULL) {
1222                 if (strncmp(Name, nptr->name, len)==0)
1223                         return 1;
1224                 nptr = nptr->next;
1225         }
1226         return 0;
1227 }
1228
1229
1230 /*
1231  * Batch up and send all outbound traffic from the current room
1232  */
1233 void network_spoolout_room(char *room_to_spool) {
1234         char buf[SIZ];
1235         char filename[PATH_MAX];
1236         SpoolControl *sc;
1237         int i;
1238
1239         /*
1240          * If the room doesn't exist, don't try to perform its networking tasks.
1241          * Normally this should never happen, but once in a while maybe a room gets
1242          * queued for networking and then deleted before it can happen.
1243          */
1244         if (CtdlGetRoom(&CC->room, room_to_spool) != 0) {
1245                 CtdlLogPrintf(CTDL_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
1246                 return;
1247         }
1248
1249         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1250         begin_critical_section(S_NETCONFIGS);
1251
1252         /* Only do net processing for rooms that have netconfigs */
1253         if (!read_spoolcontrol_file(&sc, filename))
1254         {
1255                 end_critical_section(S_NETCONFIGS);
1256                 return;
1257         }
1258         CtdlLogPrintf(CTDL_INFO, "Networking started for <%s>\n", CC->room.QRname);
1259
1260         /* If there are digest recipients, we have to build a digest */
1261         if (sc->digestrecps != NULL) {
1262                 sc->digestfp = tmpfile();
1263                 fprintf(sc->digestfp, "Content-type: text/plain\n\n");
1264         }
1265
1266         /* Do something useful */
1267         CtdlForEachMessage(MSGS_GT, sc->lastsent, NULL, NULL, NULL,
1268                 network_spool_msg, sc);
1269
1270         /* If we wrote a digest, deliver it and then close it */
1271         snprintf(buf, sizeof buf, "room_%s@%s",
1272                 CC->room.QRname, config.c_fqdn);
1273         for (i=0; buf[i]; ++i) {
1274                 buf[i] = tolower(buf[i]);
1275                 if (isspace(buf[i])) buf[i] = '_';
1276         }
1277         if (sc->digestfp != NULL) {
1278                 fprintf(sc->digestfp,   " -----------------------------------"
1279                                         "------------------------------------"
1280                                         "-------\n"
1281                                         "You are subscribed to the '%s' "
1282                                         "list.\n"
1283                                         "To post to the list: %s\n",
1284                                         CC->room.QRname, buf
1285                 );
1286                 network_deliver_digest(sc);     /* deliver and close */
1287         }
1288
1289         /* Now rewrite the config file */
1290         writenfree_spoolcontrol_file (&sc, filename);
1291         end_critical_section(S_NETCONFIGS);
1292 }
1293
1294
1295
1296 /*
1297  * Send the *entire* contents of the current room to one specific network node,
1298  * ignoring anything we know about which messages have already undergone
1299  * network processing.  This can be used to bring a new node into sync.
1300  */
1301 int network_sync_to(char *target_node) {
1302         SpoolControl sc;
1303         int num_spooled = 0;
1304         int found_node = 0;
1305         char buf[256];
1306         char sc_type[256];
1307         char sc_node[256];
1308         char sc_room[256];
1309         char filename[PATH_MAX];
1310         FILE *fp;
1311
1312         /* Grab the configuration line we're looking for */
1313         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
1314         begin_critical_section(S_NETCONFIGS);
1315         fp = fopen(filename, "r");
1316         if (fp == NULL) {
1317                 end_critical_section(S_NETCONFIGS);
1318                 return(-1);
1319         }
1320         while (fgets(buf, sizeof buf, fp) != NULL) {
1321                 buf[strlen(buf)-1] = 0;
1322                 extract_token(sc_type, buf, 0, '|', sizeof sc_type);
1323                 extract_token(sc_node, buf, 1, '|', sizeof sc_node);
1324                 extract_token(sc_room, buf, 2, '|', sizeof sc_room);
1325                 if ( (!strcasecmp(sc_type, "ignet_push_share"))
1326                    && (!strcasecmp(sc_node, target_node)) ) {
1327                         found_node = 1;
1328
1329                         /* Concise syntax because we don't need a full linked-list */
1330                         memset(&sc, 0, sizeof(SpoolControl));
1331                         sc.ignet_push_shares = (maplist *)
1332                                 malloc(sizeof(maplist));
1333                         sc.ignet_push_shares->next = NULL;
1334                         safestrncpy(sc.ignet_push_shares->remote_nodename,
1335                                 sc_node,
1336                                 sizeof sc.ignet_push_shares->remote_nodename);
1337                         safestrncpy(sc.ignet_push_shares->remote_roomname,
1338                                 sc_room,
1339                                 sizeof sc.ignet_push_shares->remote_roomname);
1340                 }
1341         }
1342         fclose(fp);
1343         end_critical_section(S_NETCONFIGS);
1344
1345         if (!found_node) return(-1);
1346
1347         /* Send ALL messages */
1348         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL,
1349                 network_spool_msg, &sc);
1350
1351         /* Concise cleanup because we know there's only one node in the sc */
1352         free(sc.ignet_push_shares);
1353
1354         CtdlLogPrintf(CTDL_NOTICE, "Synchronized %d messages to <%s>\n",
1355                 num_spooled, target_node);
1356         return(num_spooled);
1357 }
1358
1359
1360 /*
1361  * Implements the NSYN command
1362  */
1363 void cmd_nsyn(char *argbuf) {
1364         int num_spooled;
1365         char target_node[256];
1366
1367         if (CtdlAccessCheck(ac_aide)) return;
1368
1369         extract_token(target_node, argbuf, 0, '|', sizeof target_node);
1370         num_spooled = network_sync_to(target_node);
1371         if (num_spooled >= 0) {
1372                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
1373         }
1374         else {
1375                 cprintf("%d No such room/node share exists.\n",
1376                         ERROR + ROOM_NOT_FOUND);
1377         }
1378 }
1379
1380
1381
1382 /*
1383  * Batch up and send all outbound traffic from the current room
1384  */
1385 void network_queue_room(struct ctdlroom *qrbuf, void *data) {
1386         struct RoomProcList *ptr;
1387
1388         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
1389         if (ptr == NULL) return;
1390
1391         safestrncpy(ptr->name, qrbuf->QRname, sizeof ptr->name);
1392         begin_critical_section(S_RPLIST);
1393         ptr->next = rplist;
1394         rplist = ptr;
1395         end_critical_section(S_RPLIST);
1396 }
1397
1398 void destroy_network_queue_room(void)
1399 {
1400         struct RoomProcList *cur, *p;
1401         NetMap *nmcur, *nmp;
1402
1403         cur = rplist;
1404         begin_critical_section(S_RPLIST);
1405         while (cur != NULL)
1406         {
1407                 p = cur->next;
1408                 free (cur);
1409                 cur = p;
1410         }
1411         rplist = NULL;
1412         end_critical_section(S_RPLIST);
1413
1414         nmcur = the_netmap;
1415         while (nmcur != NULL)
1416         {
1417                 nmp = nmcur->next;
1418                 free (nmcur);
1419                 nmcur = nmp;
1420         }
1421         the_netmap = NULL;
1422         if (working_ignetcfg != NULL)
1423                 free (working_ignetcfg);
1424         working_ignetcfg = NULL;
1425 }
1426
1427
1428 /*
1429  * Learn topology from path fields
1430  */
1431 void network_learn_topology(char *node, char *path) {
1432         char nexthop[256];
1433         NetMap *nmptr;
1434
1435         strcpy(nexthop, "");
1436
1437         if (num_tokens(path, '!') < 3) return;
1438         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
1439                 if (!strcasecmp(nmptr->nodename, node)) {
1440                         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1441                         nmptr->lastcontact = time(NULL);
1442                         ++netmap_changed;
1443                         return;
1444                 }
1445         }
1446
1447         /* If we got here then it's not in the map, so add it. */
1448         nmptr = (NetMap *) malloc(sizeof (NetMap));
1449         strcpy(nmptr->nodename, node);
1450         nmptr->lastcontact = time(NULL);
1451         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
1452         nmptr->next = the_netmap;
1453         the_netmap = nmptr;
1454         ++netmap_changed;
1455 }
1456
1457
1458
1459
1460 /*
1461  * Bounce a message back to the sender
1462  */
1463 void network_bounce(struct CtdlMessage *msg, char *reason) {
1464         char *oldpath = NULL;
1465         char buf[SIZ];
1466         char bouncesource[SIZ];
1467         char recipient[SIZ];
1468         struct recptypes *valid = NULL;
1469         char force_room[ROOMNAMELEN];
1470         static int serialnum = 0;
1471         size_t size;
1472
1473         CtdlLogPrintf(CTDL_DEBUG, "entering network_bounce()\n");
1474
1475         if (msg == NULL) return;
1476
1477         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
1478
1479         /*
1480          * Give it a fresh message ID
1481          */
1482         if (msg->cm_fields['I'] != NULL) {
1483                 free(msg->cm_fields['I']);
1484         }
1485         snprintf(buf, sizeof buf, "%ld.%04lx.%04x@%s",
1486                 (long)time(NULL), (long)getpid(), ++serialnum, config.c_fqdn);
1487         msg->cm_fields['I'] = strdup(buf);
1488
1489         /*
1490          * FIXME ... right now we're just sending a bounce; we really want to
1491          * include the text of the bounced message.
1492          */
1493         if (msg->cm_fields['M'] != NULL) {
1494                 free(msg->cm_fields['M']);
1495         }
1496         msg->cm_fields['M'] = strdup(reason);
1497         msg->cm_format_type = 0;
1498
1499         /*
1500          * Turn the message around
1501          */
1502         if (msg->cm_fields['R'] == NULL) {
1503                 free(msg->cm_fields['R']);
1504         }
1505
1506         if (msg->cm_fields['D'] == NULL) {
1507                 free(msg->cm_fields['D']);
1508         }
1509
1510         snprintf(recipient, sizeof recipient, "%s@%s",
1511                 msg->cm_fields['A'], msg->cm_fields['N']);
1512
1513         if (msg->cm_fields['A'] == NULL) {
1514                 free(msg->cm_fields['A']);
1515         }
1516
1517         if (msg->cm_fields['N'] == NULL) {
1518                 free(msg->cm_fields['N']);
1519         }
1520
1521         if (msg->cm_fields['U'] == NULL) {
1522                 free(msg->cm_fields['U']);
1523         }
1524
1525         msg->cm_fields['A'] = strdup(BOUNCESOURCE);
1526         msg->cm_fields['N'] = strdup(config.c_nodename);
1527         msg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
1528
1529         /* prepend our node to the path */
1530         if (msg->cm_fields['P'] != NULL) {
1531                 oldpath = msg->cm_fields['P'];
1532                 msg->cm_fields['P'] = NULL;
1533         }
1534         else {
1535                 oldpath = strdup("unknown_user");
1536         }
1537         size = strlen(oldpath) + SIZ;
1538         msg->cm_fields['P'] = malloc(size);
1539         snprintf(msg->cm_fields['P'], size, "%s!%s", config.c_nodename, oldpath);
1540         free(oldpath);
1541
1542         /* Now submit the message */
1543         valid = validate_recipients(recipient, NULL, 0);
1544         if (valid != NULL) if (valid->num_error != 0) {
1545                 free_recipients(valid);
1546                 valid = NULL;
1547         }
1548         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
1549                 strcpy(force_room, config.c_aideroom);
1550         }
1551         else {
1552                 strcpy(force_room, "");
1553         }
1554         if ( (valid == NULL) && IsEmptyStr(force_room) ) {
1555                 strcpy(force_room, config.c_aideroom);
1556         }
1557         CtdlSubmitMsg(msg, valid, force_room, 0);
1558
1559         /* Clean up */
1560         if (valid != NULL) free_recipients(valid);
1561         CtdlFreeMessage(msg);
1562         CtdlLogPrintf(CTDL_DEBUG, "leaving network_bounce()\n");
1563 }
1564
1565
1566
1567
1568 /*
1569  * Process a buffer containing a single message from a single file
1570  * from the inbound queue
1571  */
1572 void network_process_buffer(char *buffer, long size) {
1573         struct CtdlMessage *msg = NULL;
1574         long pos;
1575         int field;
1576         struct recptypes *recp = NULL;
1577         char target_room[ROOMNAMELEN];
1578         struct ser_ret sermsg;
1579         char *oldpath = NULL;
1580         char filename[PATH_MAX];
1581         FILE *fp;
1582         char nexthop[SIZ];
1583         unsigned char firstbyte;
1584         unsigned char lastbyte;
1585
1586         CtdlLogPrintf(CTDL_DEBUG, "network_process_buffer() processing %ld bytes\n", size);
1587
1588         /* Validate just a little bit.  First byte should be FF and * last byte should be 00. */
1589         firstbyte = buffer[0];
1590         lastbyte = buffer[size-1];
1591         if ( (firstbyte != 255) || (lastbyte != 0) ) {
1592                 CtdlLogPrintf(CTDL_ERR, "Corrupt message ignored.  Length=%ld, firstbyte = %d, lastbyte = %d\n",
1593                         size, firstbyte, lastbyte);
1594                 return;
1595         }
1596
1597         /* Set default target room to trash */
1598         strcpy(target_room, TWITROOM);
1599
1600         /* Load the message into memory */
1601         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1602         memset(msg, 0, sizeof(struct CtdlMessage));
1603         msg->cm_magic = CTDLMESSAGE_MAGIC;
1604         msg->cm_anon_type = buffer[1];
1605         msg->cm_format_type = buffer[2];
1606
1607         for (pos = 3; pos < size; ++pos) {
1608                 field = buffer[pos];
1609                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
1610                 pos = pos + strlen(&buffer[(int)pos]);
1611         }
1612
1613         /* Check for message routing */
1614         if (msg->cm_fields['D'] != NULL) {
1615                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
1616
1617                         /* route the message */
1618                         strcpy(nexthop, "");
1619                         if (is_valid_node(nexthop, NULL, msg->cm_fields['D']) == 0) {
1620                                 /* prepend our node to the path */
1621                                 if (msg->cm_fields['P'] != NULL) {
1622                                         oldpath = msg->cm_fields['P'];
1623                                         msg->cm_fields['P'] = NULL;
1624                                 }
1625                                 else {
1626                                         oldpath = strdup("unknown_user");
1627                                 }
1628                                 size = strlen(oldpath) + SIZ;
1629                                 msg->cm_fields['P'] = malloc(size);
1630                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
1631                                         config.c_nodename, oldpath);
1632                                 free(oldpath);
1633
1634                                 /* serialize the message */
1635                                 serialize_message(&sermsg, msg);
1636
1637                                 /* now send it */
1638                                 if (IsEmptyStr(nexthop)) {
1639                                         strcpy(nexthop, msg->cm_fields['D']);
1640                                 }
1641                                 snprintf(filename,
1642                                         sizeof filename,
1643                                         "%s/%s@%lx%x",
1644                                         ctdl_netout_dir,
1645                                         nexthop,
1646                                         time(NULL),
1647                                         rand()
1648                                 );
1649                                 CtdlLogPrintf(CTDL_DEBUG, "Appending to %s\n", filename);
1650                                 fp = fopen(filename, "ab");
1651                                 if (fp != NULL) {
1652                                         fwrite(sermsg.ser, sermsg.len, 1, fp);
1653                                         fclose(fp);
1654                                 }
1655                                 else {
1656                                         CtdlLogPrintf(CTDL_ERR, "%s: %s\n", filename, strerror(errno));
1657                                 }
1658                                 free(sermsg.ser);
1659                                 CtdlFreeMessage(msg);
1660                                 return;
1661                         }
1662
1663                         else {  /* invalid destination node name */
1664
1665                                 network_bounce(msg,
1666 "A message you sent could not be delivered due to an invalid destination node"
1667 " name.  Please check the address and try sending the message again.\n");
1668                                 msg = NULL;
1669                                 return;
1670
1671                         }
1672                 }
1673         }
1674
1675         /*
1676          * Check to see if we already have a copy of this message, and
1677          * abort its processing if so.  (We used to post a warning to Aide>
1678          * every time this happened, but the network is now so densely
1679          * connected that it's inevitable.)
1680          */
1681         if (network_usetable(msg) != 0) {
1682                 CtdlFreeMessage(msg);
1683                 return;
1684         }
1685
1686         /* Learn network topology from the path */
1687         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
1688                 network_learn_topology(msg->cm_fields['N'], msg->cm_fields['P']);
1689         }
1690
1691         /* Is the sending node giving us a very persuasive suggestion about
1692          * which room this message should be saved in?  If so, go with that.
1693          */
1694         if (msg->cm_fields['C'] != NULL) {
1695                 safestrncpy(target_room, msg->cm_fields['C'], sizeof target_room);
1696         }
1697
1698         /* Otherwise, does it have a recipient?  If so, validate it... */
1699         else if (msg->cm_fields['R'] != NULL) {
1700                 recp = validate_recipients(msg->cm_fields['R'], NULL, 0);
1701                 if (recp != NULL) if (recp->num_error != 0) {
1702                         network_bounce(msg,
1703                                 "A message you sent could not be delivered due to an invalid address.\n"
1704                                 "Please check the address and try sending the message again.\n");
1705                         msg = NULL;
1706                         free_recipients(recp);
1707                         CtdlLogPrintf(CTDL_DEBUG, "Bouncing message due to invalid recipient address.\n");
1708                         return;
1709                 }
1710                 strcpy(target_room, "");        /* no target room if mail */
1711         }
1712
1713         /* Our last shot at finding a home for this message is to see if
1714          * it has the O field (Originating room) set.
1715          */
1716         else if (msg->cm_fields['O'] != NULL) {
1717                 safestrncpy(target_room, msg->cm_fields['O'], sizeof target_room);
1718         }
1719
1720         /* Strip out fields that are only relevant during transit */
1721         if (msg->cm_fields['D'] != NULL) {
1722                 free(msg->cm_fields['D']);
1723                 msg->cm_fields['D'] = NULL;
1724         }
1725         if (msg->cm_fields['C'] != NULL) {
1726                 free(msg->cm_fields['C']);
1727                 msg->cm_fields['C'] = NULL;
1728         }
1729
1730         /* save the message into a room */
1731         if (PerformNetprocHooks(msg, target_room) == 0) {
1732                 msg->cm_flags = CM_SKIP_HOOKS;
1733                 CtdlSubmitMsg(msg, recp, target_room, 0);
1734         }
1735         CtdlFreeMessage(msg);
1736         free_recipients(recp);
1737 }
1738
1739
1740 /*
1741  * Process a single message from a single file from the inbound queue
1742  */
1743 void network_process_message(FILE *fp, long msgstart, long msgend) {
1744         long hold_pos;
1745         long size;
1746         char *buffer;
1747
1748         hold_pos = ftell(fp);
1749         size = msgend - msgstart + 1;
1750         buffer = malloc(size);
1751         if (buffer != NULL) {
1752                 fseek(fp, msgstart, SEEK_SET);
1753                 if (fread(buffer, size, 1, fp) > 0) {
1754                         network_process_buffer(buffer, size);
1755                 }
1756                 free(buffer);
1757         }
1758
1759         fseek(fp, hold_pos, SEEK_SET);
1760 }
1761
1762
1763 /*
1764  * Process a single file from the inbound queue
1765  */
1766 void network_process_file(char *filename) {
1767         FILE *fp;
1768         long msgstart = (-1L);
1769         long msgend = (-1L);
1770         long msgcur = 0L;
1771         int ch;
1772
1773
1774         fp = fopen(filename, "rb");
1775         if (fp == NULL) {
1776                 CtdlLogPrintf(CTDL_CRIT, "Error opening %s: %s\n", filename, strerror(errno));
1777                 return;
1778         }
1779
1780         fseek(fp, 0L, SEEK_END);
1781         CtdlLogPrintf(CTDL_INFO, "network: processing %ld bytes from %s\n", ftell(fp), filename);
1782         rewind(fp);
1783
1784         /* Look for messages in the data stream and break them out */
1785         while (ch = getc(fp), ch >= 0) {
1786
1787                 if (ch == 255) {
1788                         if (msgstart >= 0L) {
1789                                 msgend = msgcur - 1;
1790                                 network_process_message(fp, msgstart, msgend);
1791                         }
1792                         msgstart = msgcur;
1793                 }
1794
1795                 ++msgcur;
1796         }
1797
1798         msgend = msgcur - 1;
1799         if (msgstart >= 0L) {
1800                 network_process_message(fp, msgstart, msgend);
1801         }
1802
1803         fclose(fp);
1804         unlink(filename);
1805 }
1806
1807
1808 /*
1809  * Process anything in the inbound queue
1810  */
1811 void network_do_spoolin(void) {
1812         DIR *dp;
1813         struct dirent *d;
1814         struct stat statbuf;
1815         char filename[PATH_MAX];
1816         static time_t last_spoolin_mtime = 0L;
1817
1818         /*
1819          * Check the spoolin directory's modification time.  If it hasn't
1820          * been touched, we don't need to scan it.
1821          */
1822         if (stat(ctdl_netin_dir, &statbuf)) return;
1823         if (statbuf.st_mtime == last_spoolin_mtime) {
1824                 CtdlLogPrintf(CTDL_DEBUG, "network: nothing in inbound queue\n");
1825                 return;
1826         }
1827         last_spoolin_mtime = statbuf.st_mtime;
1828         CtdlLogPrintf(CTDL_DEBUG, "network: processing inbound queue\n");
1829
1830         /*
1831          * Ok, there's something interesting in there, so scan it.
1832          */
1833         dp = opendir(ctdl_netin_dir);
1834         if (dp == NULL) return;
1835
1836         while (d = readdir(dp), d != NULL) {
1837                 if ((strcmp(d->d_name, ".")) && (strcmp(d->d_name, ".."))) {
1838                         snprintf(filename,
1839                                 sizeof filename,
1840                                 "%s/%s",
1841                                 ctdl_netin_dir,
1842                                 d->d_name
1843                         );
1844                         network_process_file(filename);
1845                 }
1846         }
1847
1848         closedir(dp);
1849 }
1850
1851 /*
1852  * Step 1: consolidate files in the outbound queue into one file per neighbor node
1853  * Step 2: delete any files in the outbound queue that were for neighbors who no longer exist.
1854  */
1855 void network_consolidate_spoolout(void) {
1856         DIR *dp;
1857         struct dirent *d;
1858         char filename[PATH_MAX];
1859         char cmd[PATH_MAX];
1860         char nexthop[256];
1861         int i;
1862         char *ptr;
1863
1864         /* Step 1: consolidate files in the outbound queue into one file per neighbor node */
1865         dp = opendir(ctdl_netout_dir);
1866         if (dp == NULL) return;
1867         while (d = readdir(dp), d != NULL) {
1868                 if (
1869                         (strcmp(d->d_name, "."))
1870                         && (strcmp(d->d_name, ".."))
1871                         && (strchr(d->d_name, '@') != NULL)
1872                 ) {
1873                         safestrncpy(nexthop, d->d_name, sizeof nexthop);
1874                         ptr = strchr(nexthop, '@');
1875                         if (ptr) *ptr = 0;
1876
1877                         snprintf(filename,
1878                                 sizeof filename,
1879                                 "%s/%s",
1880                                 ctdl_netout_dir,
1881                                 d->d_name
1882                         );
1883
1884                         CtdlLogPrintf(CTDL_DEBUG, "Consolidate %s to %s\n", filename, nexthop);
1885                         if (network_talking_to(nexthop, NTT_CHECK)) {
1886                                 CtdlLogPrintf(CTDL_DEBUG,
1887                                         "Currently online with %s - skipping for now\n",
1888                                         nexthop
1889                                 );
1890                         }
1891                         else {
1892                                 network_talking_to(nexthop, NTT_ADD);
1893                                 snprintf(cmd, sizeof cmd, "/bin/cat %s >>%s/%s && /bin/rm -f %s",
1894                                         filename,
1895                                         ctdl_netout_dir, nexthop,
1896                                         filename
1897                                 );
1898                                 system(cmd);
1899                                 network_talking_to(nexthop, NTT_REMOVE);
1900                         }
1901                 }
1902         }
1903         closedir(dp);
1904
1905         /* Step 2: delete any files in the outbound queue that were for neighbors who no longer exist */
1906
1907         dp = opendir(ctdl_netout_dir);
1908         if (dp == NULL) return;
1909
1910         while (d = readdir(dp), d != NULL) {
1911                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
1912                         continue;
1913                 ptr = strchr(d->d_name, '@');
1914                 if (d != NULL)
1915                         continue;
1916                 snprintf(filename,
1917                         sizeof filename,
1918                         "%s/%s",
1919                         ctdl_netout_dir,
1920                         d->d_name
1921                 );
1922
1923                 strcpy(nexthop, "");
1924                 i = is_valid_node(nexthop, NULL, d->d_name);
1925
1926                 if ( (i != 0) || !IsEmptyStr(nexthop) ) {
1927                         unlink(filename);
1928                 }
1929         }
1930
1931
1932         closedir(dp);
1933 }
1934
1935
1936 /*
1937  * receive network spool from the remote system
1938  */
1939 void receive_spool(int *sock, char *remote_nodename) {
1940         int download_len = 0L;
1941         int bytes_received = 0L;
1942         char buf[SIZ];
1943         char tempfilename[PATH_MAX];
1944         char permfilename[PATH_MAX];
1945         int plen;
1946         FILE *fp;
1947
1948         snprintf(tempfilename,
1949                 sizeof tempfilename,
1950                 "%s/%s.%lx%x",
1951                 ctdl_nettmp_dir,
1952                 remote_nodename,
1953                 time(NULL),
1954                 rand()
1955         );
1956
1957         snprintf(permfilename,
1958                 sizeof permfilename,
1959                 "%s/%s.%lx%x",
1960                 ctdl_netin_dir,
1961                 remote_nodename,
1962                 time(NULL),
1963                 rand()
1964         );
1965
1966         if (sock_puts(sock, "NDOP") < 0) return;
1967         if (sock_getln(sock, buf, sizeof buf) < 0) return;
1968         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1969         if (buf[0] != '2') {
1970                 return;
1971         }
1972
1973         download_len = extract_long(&buf[4], 0);
1974         if (download_len <= 0) {
1975                 return;
1976         }
1977
1978         bytes_received = 0L;
1979         fp = fopen(tempfilename, "w");
1980         if (fp == NULL) {
1981                 CtdlLogPrintf(CTDL_CRIT, "Cannot create %s: %s\n", tempfilename, strerror(errno));
1982                 return;
1983         }
1984
1985         CtdlLogPrintf(CTDL_DEBUG, "Expecting to transfer %d bytes\n", download_len);
1986         while (bytes_received < download_len) {
1987                 /*
1988                  * If shutting down we can exit here and unlink the temp file.
1989                  * this shouldn't loose us any messages.
1990                  */
1991                 if (CtdlThreadCheckStop())
1992                 {
1993                         fclose(fp);
1994                         unlink(tempfilename);
1995                         return;
1996                 }
1997                 snprintf(buf, sizeof buf, "READ %d|%d",
1998                          bytes_received,
1999                          ((download_len - bytes_received > IGNET_PACKET_SIZE)
2000                           ? IGNET_PACKET_SIZE : (download_len - bytes_received))
2001                 );
2002
2003                 if (sock_puts(sock, buf) < 0) {
2004                         fclose(fp);
2005                         unlink(tempfilename);
2006                         return;
2007                 }
2008                 if (sock_getln(sock, buf, sizeof buf) < 0) {
2009                         fclose(fp);
2010                         unlink(tempfilename);
2011                         return;
2012                 }
2013
2014                 if (buf[0] == '6') {
2015                         plen = extract_int(&buf[4], 0);
2016                         StrBuf *pbuf = NewStrBuf();
2017                         if (socket_read_blob(sock, pbuf, plen, CLIENT_TIMEOUT) != plen) {
2018                                 CtdlLogPrintf(CTDL_INFO, "Short read from peer; aborting.\n");
2019                                 fclose(fp);
2020                                 unlink(tempfilename);
2021                                 FreeStrBuf(&pbuf);
2022                                 return;
2023                         }
2024                         fwrite(ChrPtr(pbuf), plen, 1, fp);
2025                         bytes_received += plen;
2026                         FreeStrBuf(&pbuf);
2027                 }
2028         }
2029
2030         fclose(fp);
2031
2032         /* Last chance for shutdown exit */
2033         if (CtdlThreadCheckStop())
2034         {
2035                 unlink(tempfilename);
2036                 return;
2037         }
2038
2039         if (sock_puts(sock, "CLOS") < 0) {
2040                 unlink(tempfilename);
2041                 return;
2042         }
2043
2044         /*
2045          * From here on we must complete or messages will get lost
2046          */
2047         if (sock_getln(sock, buf, sizeof buf) < 0) {
2048                 unlink(tempfilename);
2049                 return;
2050         }
2051
2052         CtdlLogPrintf(CTDL_DEBUG, "%s\n", buf);
2053
2054         /*
2055          * Now move the temp file to its permanent location.
2056          */
2057         if (link(tempfilename, permfilename) != 0) {
2058                 CtdlLogPrintf(CTDL_ALERT, "Could not link %s to %s: %s\n",
2059                         tempfilename, permfilename, strerror(errno)
2060                 );
2061         }
2062
2063         unlink(tempfilename);
2064 }
2065
2066
2067
2068 /*
2069  * transmit network spool to the remote system
2070  */
2071 void transmit_spool(int *sock, char *remote_nodename)
2072 {
2073         char buf[SIZ];
2074         char pbuf[4096];
2075         long plen;
2076         long bytes_to_write, thisblock, bytes_written;
2077         int fd;
2078         char sfname[128];
2079
2080         if (sock_puts(sock, "NUOP") < 0) return;
2081         if (sock_getln(sock, buf, sizeof buf) < 0) return;
2082         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
2083         if (buf[0] != '2') {
2084                 return;
2085         }
2086
2087         snprintf(sfname, sizeof sfname,
2088                 "%s/%s",
2089                 ctdl_netout_dir,
2090                 remote_nodename
2091         );
2092         fd = open(sfname, O_RDONLY);
2093         if (fd < 0) {
2094                 if (errno != ENOENT) {
2095                         CtdlLogPrintf(CTDL_CRIT, "cannot open %s: %s\n", sfname, strerror(errno));
2096                 }
2097                 return;
2098         }
2099         bytes_written = 0;
2100         while (plen = (long) read(fd, pbuf, IGNET_PACKET_SIZE), plen > 0L) {
2101                 bytes_to_write = plen;
2102                 while (bytes_to_write > 0L) {
2103                         /* Exit if shutting down */
2104                         if (CtdlThreadCheckStop())
2105                         {
2106                                 close(fd);
2107                                 return;
2108                         }
2109
2110                         snprintf(buf, sizeof buf, "WRIT %ld", bytes_to_write);
2111                         if (sock_puts(sock, buf) < 0) {
2112                                 close(fd);
2113                                 return;
2114                         }
2115                         if (sock_getln(sock, buf, sizeof buf) < 0) {
2116                                 close(fd);
2117                                 return;
2118                         }
2119                         thisblock = atol(&buf[4]);
2120                         if (buf[0] == '7') {
2121                                 if (sock_write(sock, pbuf, (int) thisblock) < 0) {
2122                                         close(fd);
2123                                         return;
2124                                 }
2125                                 bytes_to_write -= thisblock;
2126                                 bytes_written += thisblock;
2127                         } else {
2128                                 goto ABORTUPL;
2129                         }
2130                 }
2131         }
2132
2133 ABORTUPL:
2134         close(fd);
2135
2136         /* Last chance for shutdown exit */
2137         if(CtdlThreadCheckStop())
2138                 return;
2139
2140         if (sock_puts(sock, "UCLS 1") < 0) return;
2141
2142         /*
2143          * From here on we must complete or messages will get lost
2144          */
2145         if (sock_getln(sock, buf, sizeof buf) < 0) return;
2146         CtdlLogPrintf(CTDL_NOTICE, "Sent %ld octets to <%s>\n", bytes_written, remote_nodename);
2147         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
2148         if (buf[0] == '2') {
2149                 CtdlLogPrintf(CTDL_DEBUG, "Removing <%s>\n", sfname);
2150                 unlink(sfname);
2151         }
2152 }
2153
2154
2155
2156 /*
2157  * Poll one Citadel node (called by network_poll_other_citadel_nodes() below)
2158  */
2159 void network_poll_node(char *node, char *secret, char *host, char *port) {
2160         int sock;
2161         char buf[SIZ];
2162         char err_buf[SIZ];
2163         char connected_to[SIZ];
2164         CitContext *CCC=CC;
2165
2166         if (network_talking_to(node, NTT_CHECK)) return;
2167         network_talking_to(node, NTT_ADD);
2168         CtdlLogPrintf(CTDL_DEBUG, "network: polling <%s>\n", node);
2169         CtdlLogPrintf(CTDL_NOTICE, "Connecting to <%s> at %s:%s\n", node, host, port);
2170
2171         sock = sock_connect(host, port);
2172         if (sock < 0) {
2173                 CtdlLogPrintf(CTDL_ERR, "Could not connect: %s\n", strerror(errno));
2174                 network_talking_to(node, NTT_REMOVE);
2175                 return;
2176         }
2177
2178         CtdlLogPrintf(CTDL_DEBUG, "Connected!\n");
2179         CCC->SBuf.Buf = NewStrBuf();
2180         CCC->sMigrateBuf = NewStrBuf();
2181         CCC->SBuf.ReadWritePointer = NULL;
2182
2183         /* Read the server greeting */
2184         if (sock_getln(&sock, buf, sizeof buf) < 0) goto bail;
2185         CtdlLogPrintf(CTDL_DEBUG, ">%s\n", buf);
2186
2187         /* Check that the remote is who we think it is and warn the Aide if not */
2188         extract_token (connected_to, buf, 1, ' ', sizeof connected_to);
2189         if (strcmp(connected_to, node))
2190         {
2191                 snprintf(err_buf, sizeof(err_buf),
2192                         "Connected to node \"%s\" but I was expecting to connect to node \"%s\".",
2193                         connected_to, node
2194                 );
2195                 CtdlLogPrintf(CTDL_ERR, "%s\n", err_buf);
2196                 CtdlAideMessage(err_buf, "Network error");
2197         }
2198         else {
2199                 /* We're talking to the correct node.  Now identify ourselves. */
2200                 snprintf(buf, sizeof buf, "NETP %s|%s", config.c_nodename, secret);
2201                 CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
2202                 if (sock_puts(&sock, buf) <0) goto bail;
2203                 if (sock_getln(&sock, buf, sizeof buf) < 0) goto bail;
2204                 CtdlLogPrintf(CTDL_DEBUG, ">%s\n", buf);
2205                 if (buf[0] != '2') {
2206                         goto bail;
2207                 }
2208
2209                 /* At this point we are authenticated. */
2210                 if (!CtdlThreadCheckStop())
2211                         receive_spool(&sock, node);
2212                 if (!CtdlThreadCheckStop())
2213                         transmit_spool(&sock, node);
2214         }
2215
2216         sock_puts(&sock, "QUIT");
2217 bail:
2218         FreeStrBuf(&CCC->SBuf.Buf);
2219         FreeStrBuf(&CCC->sMigrateBuf);
2220         if (sock != -1)
2221                 sock_close(sock);
2222         network_talking_to(node, NTT_REMOVE);
2223 }
2224
2225
2226
2227 /*
2228  * Poll other Citadel nodes and transfer inbound/outbound network data.
2229  * Set "full" to nonzero to force a poll of every node, or to zero to poll
2230  * only nodes to which we have data to send.
2231  */
2232 void network_poll_other_citadel_nodes(int full_poll) {
2233         int i;
2234         char linebuf[256];
2235         char node[SIZ];
2236         char host[256];
2237         char port[256];
2238         char secret[256];
2239         int poll = 0;
2240         char spoolfile[256];
2241
2242         if (working_ignetcfg == NULL) {
2243                 CtdlLogPrintf(CTDL_DEBUG, "network: no neighbor nodes are configured - not polling.\n");
2244                 return;
2245         }
2246
2247         /* Use the string tokenizer to grab one line at a time */
2248         for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
2249                 if(CtdlThreadCheckStop())
2250                         return;
2251                 extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
2252                 extract_token(node, linebuf, 0, '|', sizeof node);
2253                 extract_token(secret, linebuf, 1, '|', sizeof secret);
2254                 extract_token(host, linebuf, 2, '|', sizeof host);
2255                 extract_token(port, linebuf, 3, '|', sizeof port);
2256                 if ( !IsEmptyStr(node) && !IsEmptyStr(secret)
2257                    && !IsEmptyStr(host) && !IsEmptyStr(port)) {
2258                         poll = full_poll;
2259                         if (poll == 0) {
2260                                 snprintf(spoolfile,
2261                                          sizeof spoolfile,
2262                                          "%s/%s",
2263                                          ctdl_netout_dir,
2264                                          node
2265                                 );
2266                                 if (access(spoolfile, R_OK) == 0) {
2267                                         poll = 1;
2268                                 }
2269                         }
2270                         if (poll) {
2271                                 network_poll_node(node, secret, host, port);
2272                         }
2273                 }
2274         }
2275
2276 }
2277
2278
2279
2280
2281 /*
2282  * It's ok if these directories already exist.  Just fail silently.
2283  */
2284 void create_spool_dirs(void) {
2285         if ((mkdir(ctdl_spool_dir, 0700) != 0) && (errno != EEXIST))
2286                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_spool_dir, strerror(errno));
2287         if (chown(ctdl_spool_dir, CTDLUID, (-1)) != 0)
2288                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_spool_dir, strerror(errno));
2289         if ((mkdir(ctdl_netin_dir, 0700) != 0) && (errno != EEXIST))
2290                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_netin_dir, strerror(errno));
2291         if (chown(ctdl_netin_dir, CTDLUID, (-1)) != 0)
2292                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netin_dir, strerror(errno));
2293         if ((mkdir(ctdl_nettmp_dir, 0700) != 0) && (errno != EEXIST))
2294                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_nettmp_dir, strerror(errno));
2295         if (chown(ctdl_nettmp_dir, CTDLUID, (-1)) != 0)
2296                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_nettmp_dir, strerror(errno));
2297         if ((mkdir(ctdl_netout_dir, 0700) != 0) && (errno != EEXIST))
2298                 CtdlLogPrintf(CTDL_EMERG, "unable to create directory [%s]: %s", ctdl_netout_dir, strerror(errno));
2299         if (chown(ctdl_netout_dir, CTDLUID, (-1)) != 0)
2300                 CtdlLogPrintf(CTDL_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netout_dir, strerror(errno));
2301 }
2302
2303
2304
2305
2306
2307 /*
2308  * network_do_queue()
2309  *
2310  * Run through the rooms doing various types of network stuff.
2311  */
2312 void network_do_queue(void) {
2313         static time_t last_run = 0L;
2314         struct RoomProcList *ptr;
2315         int full_processing = 1;
2316
2317         /*
2318          * Run the full set of processing tasks no more frequently
2319          * than once every n seconds
2320          */
2321         if ( (time(NULL) - last_run) < config.c_net_freq ) {
2322                 full_processing = 0;
2323                 CtdlLogPrintf(CTDL_DEBUG, "Network full processing in %ld seconds.\n",
2324                         config.c_net_freq - (time(NULL)- last_run)
2325                 );
2326         }
2327
2328         /*
2329          * This is a simple concurrency check to make sure only one queue run
2330          * is done at a time.  We could do this with a mutex, but since we
2331          * don't really require extremely fine granularity here, we'll do it
2332          * with a static variable instead.
2333          */
2334         if (doing_queue) {
2335                 return;
2336         }
2337         doing_queue = 1;
2338
2339         /* Load the IGnet Configuration into memory */
2340         load_working_ignetcfg();
2341
2342         /*
2343          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
2344          * then we poll everyone.  Otherwise we only poll nodes we have stuff
2345          * to send to.
2346          */
2347         network_poll_other_citadel_nodes(full_processing);
2348
2349         /*
2350          * Load the network map and filter list into memory.
2351          */
2352         read_network_map();
2353         filterlist = load_filter_list();
2354
2355         /*
2356          * Go ahead and run the queue
2357          */
2358         if (full_processing && !CtdlThreadCheckStop()) {
2359                 CtdlLogPrintf(CTDL_DEBUG, "network: loading outbound queue\n");
2360                 CtdlForEachRoom(network_queue_room, NULL);
2361         }
2362
2363         if (rplist != NULL) {
2364                 CtdlLogPrintf(CTDL_DEBUG, "network: running outbound queue\n");
2365                 while (rplist != NULL && !CtdlThreadCheckStop()) {
2366                         char spoolroomname[ROOMNAMELEN];
2367                         safestrncpy(spoolroomname, rplist->name, sizeof spoolroomname);
2368                         begin_critical_section(S_RPLIST);
2369
2370                         /* pop this record off the list */
2371                         ptr = rplist;
2372                         rplist = rplist->next;
2373                         free(ptr);
2374
2375                         /* invalidate any duplicate entries to prevent double processing */
2376                         for (ptr=rplist; ptr!=NULL; ptr=ptr->next) {
2377                                 if (!strcasecmp(ptr->name, spoolroomname)) {
2378                                         ptr->name[0] = 0;
2379                                 }
2380                         }
2381
2382                         end_critical_section(S_RPLIST);
2383                         if (spoolroomname[0] != 0) {
2384                                 network_spoolout_room(spoolroomname);
2385                         }
2386                 }
2387         }
2388
2389         /* If there is anything in the inbound queue, process it */
2390         if (!CtdlThreadCheckStop()) {
2391                 network_do_spoolin();
2392         }
2393
2394         /* Save the network map back to disk */
2395         write_network_map();
2396
2397         /* Free the filter list in memory */
2398         free_filter_list(filterlist);
2399         filterlist = NULL;
2400
2401         network_consolidate_spoolout();
2402
2403         CtdlLogPrintf(CTDL_DEBUG, "network: queue run completed\n");
2404
2405         if (full_processing) {
2406                 last_run = time(NULL);
2407         }
2408
2409         doing_queue = 0;
2410 }
2411
2412
2413 /*
2414  * cmd_netp() - authenticate to the server as another Citadel node polling
2415  *            for network traffic
2416  */
2417 void cmd_netp(char *cmdbuf)
2418 {
2419         char node[256];
2420         char pass[256];
2421         int v;
2422
2423         char secret[256];
2424         char nexthop[256];
2425         char err_buf[SIZ];
2426
2427         /* Authenticate */
2428         extract_token(node, cmdbuf, 0, '|', sizeof node);
2429         extract_token(pass, cmdbuf, 1, '|', sizeof pass);
2430
2431         /* load the IGnet Configuration to check node validity */
2432         load_working_ignetcfg();
2433         v = is_valid_node(nexthop, secret, node);
2434
2435         if (v != 0) {
2436                 snprintf(err_buf, sizeof err_buf,
2437                         "An unknown Citadel server called \"%s\" attempted to connect from %s [%s].\n",
2438                         node, CC->cs_host, CC->cs_addr
2439                 );
2440                 CtdlLogPrintf(CTDL_WARNING, err_buf);
2441                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2442                 CtdlAideMessage(err_buf, "IGNet Networking.");
2443                 return;
2444         }
2445
2446         if (strcasecmp(pass, secret)) {
2447                 snprintf(err_buf, sizeof err_buf,
2448                         "A Citadel server at %s [%s] failed to authenticate as network node \"%s\".\n",
2449                         CC->cs_host, CC->cs_addr, node
2450                 );
2451                 CtdlLogPrintf(CTDL_WARNING, err_buf);
2452                 cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
2453                 CtdlAideMessage(err_buf, "IGNet Networking.");
2454                 return;
2455         }
2456
2457         if (network_talking_to(node, NTT_CHECK)) {
2458                 CtdlLogPrintf(CTDL_WARNING, "Duplicate session for network node <%s>", node);
2459                 cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
2460                 return;
2461         }
2462
2463         safestrncpy(CC->net_node, node, sizeof CC->net_node);
2464         network_talking_to(node, NTT_ADD);
2465         CtdlLogPrintf(CTDL_NOTICE, "Network node <%s> logged in from %s [%s]\n",
2466                 CC->net_node, CC->cs_host, CC->cs_addr
2467         );
2468         cprintf("%d authenticated as network node '%s'\n", CIT_OK, CC->net_node);
2469 }
2470
2471
2472 int network_room_handler (struct ctdlroom *room)
2473 {
2474         network_queue_room(room, NULL);
2475         return 0;
2476 }
2477
2478 void *ignet_thread(void *arg) {
2479         struct CitContext ignet_thread_CC;
2480
2481         CtdlLogPrintf(CTDL_DEBUG, "ignet_thread() initializing\n");
2482         CtdlFillSystemContext(&ignet_thread_CC, "IGnet Queue");
2483         citthread_setspecific(MyConKey, (void *)&ignet_thread_CC);
2484
2485         while (!CtdlThreadCheckStop()) {
2486                 network_do_queue();
2487                 CtdlThreadSleep(60);
2488         }
2489
2490         CtdlClearSystemContext();
2491         return(NULL);
2492 }
2493
2494
2495
2496
2497 /*
2498  * Module entry point
2499  */
2500 CTDL_MODULE_INIT(network)
2501 {
2502         if (!threading)
2503         {
2504                 create_spool_dirs();
2505                 CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
2506                 CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
2507                 CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
2508                 CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
2509                 CtdlRegisterRoomHook(network_room_handler);
2510                 CtdlRegisterCleanupHook(destroy_network_queue_room);
2511                 CtdlThreadCreate("SMTP Send", CTDLTHREAD_BIGSTACK, ignet_thread, NULL);
2512         }
2513         return "network";
2514 }