citadel/modules/network/serv_netspool.c

   1 /*
   2  * This module handles shared rooms, inter-Citadel mail, and outbound
   3  * mailing list processing.
   4  *
   5  * Copyright (c) 2000-2011 by the citadel.org team
   6  *
   7  *  This program is open source 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 #include "netconfig.h"
  91 #include "netmail.h"
  92 #include "ctdl_module.h"
  93
  94 /*
  95  * Learn topology from path fields
  96  */
  97 void network_learn_topology(char *node, char *path) {
  98         char nexthop[256];
  99         NetMap *nmptr;
 100
 101         strcpy(nexthop, "");
 102
 103         if (num_tokens(path, '!') < 3) return;
 104         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 105                 if (!strcasecmp(nmptr->nodename, node)) {
 106                         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
 107                         nmptr->lastcontact = time(NULL);
 108                         ++netmap_changed;
 109                         return;
 110                 }
 111         }
 112
 113         /* If we got here then it's not in the map, so add it. */
 114         nmptr = (NetMap *) malloc(sizeof (NetMap));
 115         strcpy(nmptr->nodename, node);
 116         nmptr->lastcontact = time(NULL);
 117         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
 118         nmptr->next = the_netmap;
 119         the_netmap = nmptr;
 120         ++netmap_changed;
 121 }
 122
 123
 124
 125
 126 int read_spoolcontrol_file(SpoolControl **scc, char *filename)
 127 {
 128         FILE *fp;
 129         char instr[SIZ];
 130         char buf[SIZ];
 131         char nodename[256];
 132         char roomname[ROOMNAMELEN];
 133         size_t miscsize = 0;
 134         size_t linesize = 0;
 135         int skipthisline = 0;
 136         namelist *nptr = NULL;
 137         maplist *mptr = NULL;
 138         SpoolControl *sc;
 139
 140         fp = fopen(filename, "r");
 141         if (fp == NULL) {
 142                 return 0;
 143         }
 144         sc = malloc(sizeof(SpoolControl));
 145         memset(sc, 0, sizeof(SpoolControl));
 146         *scc = sc;
 147
 148         while (fgets(buf, sizeof buf, fp) != NULL) {
 149                 buf[strlen(buf)-1] = 0;
 150
 151                 extract_token(instr, buf, 0, '|', sizeof instr);
 152                 if (!strcasecmp(instr, strof(lastsent))) {
 153                         sc->lastsent = extract_long(buf, 1);
 154                 }
 155                 else if (!strcasecmp(instr, strof(listrecp))) {
 156                         nptr = (namelist *)
 157                                 malloc(sizeof(namelist));
 158                         nptr->next = sc->listrecps;
 159                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 160                         sc->listrecps = nptr;
 161                 }
 162                 else if (!strcasecmp(instr, strof(participate))) {
 163                         nptr = (namelist *)
 164                                 malloc(sizeof(namelist));
 165                         nptr->next = sc->participates;
 166                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 167                         sc->participates = nptr;
 168                 }
 169                 else if (!strcasecmp(instr, strof(digestrecp))) {
 170                         nptr = (namelist *)
 171                                 malloc(sizeof(namelist));
 172                         nptr->next = sc->digestrecps;
 173                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 174                         sc->digestrecps = nptr;
 175                 }
 176                 else if (!strcasecmp(instr, strof(ignet_push_share))) {
 177                         extract_token(nodename, buf, 1, '|', sizeof nodename);
 178                         extract_token(roomname, buf, 2, '|', sizeof roomname);
 179                         mptr = (maplist *) malloc(sizeof(maplist));
 180                         mptr->next = sc->ignet_push_shares;
 181                         strcpy(mptr->remote_nodename, nodename);
 182                         strcpy(mptr->remote_roomname, roomname);
 183                         sc->ignet_push_shares = mptr;
 184                 }
 185                 else {
 186                         /* Preserve 'other' lines ... *unless* they happen to
 187                          * be subscribe/unsubscribe pendings with expired
 188                          * timestamps.
 189                          */
 190                         skipthisline = 0;
 191                         if (!strncasecmp(buf, strof(subpending)"|", 11)) {
 192                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
 193                                         skipthisline = 1;
 194                                 }
 195                         }
 196                         if (!strncasecmp(buf, strof(unsubpending)"|", 13)) {
 197                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
 198                                         skipthisline = 1;
 199                                 }
 200                         }
 201
 202                         if (skipthisline == 0) {
 203                                 linesize = strlen(buf);
 204                                 sc->misc = realloc(sc->misc,
 205                                         (miscsize + linesize + 2) );
 206                                 sprintf(&sc->misc[miscsize], "%s\n", buf);
 207                                 miscsize = miscsize + linesize + 1;
 208                         }
 209                 }
 210
 211
 212         }
 213         fclose(fp);
 214         return 1;
 215 }
 216
 217 void free_spoolcontrol_struct(SpoolControl **scc)
 218 {
 219         SpoolControl *sc;
 220         namelist *nptr = NULL;
 221         maplist *mptr = NULL;
 222
 223         sc = *scc;
 224         while (sc->listrecps != NULL) {
 225                 nptr = sc->listrecps->next;
 226                 free(sc->listrecps);
 227                 sc->listrecps = nptr;
 228         }
 229         /* Do the same for digestrecps */
 230         while (sc->digestrecps != NULL) {
 231                 nptr = sc->digestrecps->next;
 232                 free(sc->digestrecps);
 233                 sc->digestrecps = nptr;
 234         }
 235         /* Do the same for participates */
 236         while (sc->participates != NULL) {
 237                 nptr = sc->participates->next;
 238                 free(sc->participates);
 239                 sc->participates = nptr;
 240         }
 241         while (sc->ignet_push_shares != NULL) {
 242                 mptr = sc->ignet_push_shares->next;
 243                 free(sc->ignet_push_shares);
 244                 sc->ignet_push_shares = mptr;
 245         }
 246         free(sc->misc);
 247         free(sc);
 248         *scc=NULL;
 249 }
 250
 251 int writenfree_spoolcontrol_file(SpoolControl **scc, char *filename)
 252 {
 253         char tempfilename[PATH_MAX];
 254         int TmpFD;
 255         SpoolControl *sc;
 256         namelist *nptr = NULL;
 257         maplist *mptr = NULL;
 258         long len;
 259         time_t unixtime;
 260         struct timeval tv;
 261         long reltid; /* if we don't have SYS_gettid, use "random" value */
 262         StrBuf *Cfg;
 263         int rc;
 264
 265         len = strlen(filename);
 266         memcpy(tempfilename, filename, len + 1);
 267
 268
 269 #if defined(HAVE_SYSCALL_H) && defined (SYS_gettid)
 270         reltid = syscall(SYS_gettid);
 271 #endif
 272         gettimeofday(&tv, NULL);
 273         /* Promote to time_t; types differ on some OSes (like darwin) */
 274         unixtime = tv.tv_sec;
 275
 276         sprintf(tempfilename + len, ".%ld-%ld", reltid, unixtime);
 277         sc = *scc;
 278         errno = 0;
 279         TmpFD = open(tempfilename, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
 280         Cfg = NewStrBuf();
 281         if ((TmpFD < 0) || (errno != 0)) {
 282                 syslog(LOG_CRIT, "ERROR: cannot open %s: %s\n",
 283                         filename, strerror(errno));
 284                 free_spoolcontrol_struct(scc);
 285                 unlink(tempfilename);
 286         }
 287         else {
 288                 fchown(TmpFD, config.c_ctdluid, 0);
 289                 StrBufAppendPrintf(Cfg, "lastsent|%ld\n", sc->lastsent);
 290
 291                 /* Write out the listrecps while freeing from memory at the
 292                  * same time.  Am I clever or what?  :)
 293                  */
 294                 while (sc->listrecps != NULL) {
 295                     StrBufAppendPrintf(Cfg, "listrecp|%s\n", sc->listrecps->name);
 296                         nptr = sc->listrecps->next;
 297                         free(sc->listrecps);
 298                         sc->listrecps = nptr;
 299                 }
 300                 /* Do the same for digestrecps */
 301                 while (sc->digestrecps != NULL) {
 302                         StrBufAppendPrintf(Cfg, "digestrecp|%s\n", sc->digestrecps->name);
 303                         nptr = sc->digestrecps->next;
 304                         free(sc->digestrecps);
 305                         sc->digestrecps = nptr;
 306                 }
 307                 /* Do the same for participates */
 308                 while (sc->participates != NULL) {
 309                         StrBufAppendPrintf(Cfg, "participate|%s\n", sc->participates->name);
 310                         nptr = sc->participates->next;
 311                         free(sc->participates);
 312                         sc->participates = nptr;
 313                 }
 314                 while (sc->ignet_push_shares != NULL) {
 315                         StrBufAppendPrintf(Cfg, "ignet_push_share|%s", sc->ignet_push_shares->remote_nodename);
 316                         if (!IsEmptyStr(sc->ignet_push_shares->remote_roomname)) {
 317                                 StrBufAppendPrintf(Cfg, "|%s", sc->ignet_push_shares->remote_roomname);
 318                         }
 319                         StrBufAppendPrintf(Cfg, "\n");
 320                         mptr = sc->ignet_push_shares->next;
 321                         free(sc->ignet_push_shares);
 322                         sc->ignet_push_shares = mptr;
 323                 }
 324                 if (sc->misc != NULL) {
 325                         StrBufAppendBufPlain(Cfg, sc->misc, -1, 0);
 326                 }
 327                 free(sc->misc);
 328
 329                 rc = write(TmpFD, ChrPtr(Cfg), StrLength(Cfg));
 330                 if ((rc >=0 ) && (rc == StrLength(Cfg)))
 331                 {
 332                         close(TmpFD);
 333                         rename(tempfilename, filename);
 334                 }
 335                 else {
 336                         syslog(LOG_EMERG,
 337                                       "unable to write %s; [%s]; not enough space on the disk?\n",
 338                                       tempfilename,
 339                                       strerror(errno));
 340                         close(TmpFD);
 341                         unlink(tempfilename);
 342                 }
 343                 FreeStrBuf(&Cfg);
 344                 free(sc);
 345                 *scc=NULL;
 346         }
 347         return 1;
 348 }
 349 int is_recipient(SpoolControl *sc, const char *Name)
 350 {
 351         namelist *nptr;
 352         size_t len;
 353
 354         len = strlen(Name);
 355         nptr = sc->listrecps;
 356         while (nptr != NULL) {
 357                 if (strncmp(Name, nptr->name, len)==0)
 358                         return 1;
 359                 nptr = nptr->next;
 360         }
 361         /* Do the same for digestrecps */
 362         nptr = sc->digestrecps;
 363         while (nptr != NULL) {
 364                 if (strncmp(Name, nptr->name, len)==0)
 365                         return 1;
 366                 nptr = nptr->next;
 367         }
 368         /* Do the same for participates */
 369         nptr = sc->participates;
 370         while (nptr != NULL) {
 371                 if (strncmp(Name, nptr->name, len)==0)
 372                         return 1;
 373                 nptr = nptr->next;
 374         }
 375         return 0;
 376 }
 377
 378
 379 /*
 380  * Batch up and send all outbound traffic from the current room
 381  */
 382 void network_spoolout_room(char *room_to_spool) {
 383         char buf[SIZ];
 384         char filename[PATH_MAX];
 385         SpoolControl *sc;
 386         int i;
 387
 388         /*
 389          * If the room doesn't exist, don't try to perform its networking tasks.
 390          * Normally this should never happen, but once in a while maybe a room gets
 391          * queued for networking and then deleted before it can happen.
 392          */
 393         if (CtdlGetRoom(&CC->room, room_to_spool) != 0) {
 394                 syslog(LOG_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
 395                 return;
 396         }
 397
 398         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 399         begin_critical_section(S_NETCONFIGS);
 400
 401         /* Only do net processing for rooms that have netconfigs */
 402         if (!read_spoolcontrol_file(&sc, filename))
 403         {
 404                 end_critical_section(S_NETCONFIGS);
 405                 return;
 406         }
 407         syslog(LOG_INFO, "Networking started for <%s>\n", CC->room.QRname);
 408
 409         /* If there are digest recipients, we have to build a digest */
 410         if (sc->digestrecps != NULL) {
 411                 sc->digestfp = tmpfile();
 412                 fprintf(sc->digestfp, "Content-type: text/plain\n\n");
 413         }
 414
 415         /* Do something useful */
 416         CtdlForEachMessage(MSGS_GT, sc->lastsent, NULL, NULL, NULL,
 417                 network_spool_msg, sc);
 418
 419         /* If we wrote a digest, deliver it and then close it */
 420         snprintf(buf, sizeof buf, "room_%s@%s",
 421                 CC->room.QRname, config.c_fqdn);
 422         for (i=0; buf[i]; ++i) {
 423                 buf[i] = tolower(buf[i]);
 424                 if (isspace(buf[i])) buf[i] = '_';
 425         }
 426         if (sc->digestfp != NULL) {
 427                 fprintf(sc->digestfp,   " -----------------------------------"
 428                                         "------------------------------------"
 429                                         "-------\n"
 430                                         "You are subscribed to the '%s' "
 431                                         "list.\n"
 432                                         "To post to the list: %s\n",
 433                                         CC->room.QRname, buf
 434                 );
 435                 network_deliver_digest(sc);     /* deliver and close */
 436         }
 437
 438         /* Now rewrite the config file */
 439         writenfree_spoolcontrol_file(&sc, filename);
 440         end_critical_section(S_NETCONFIGS);
 441 }
 442
 443 /*
 444  * Process a buffer containing a single message from a single file
 445  * from the inbound queue
 446  */
 447 void network_process_buffer(char *buffer, long size) {
 448         struct CtdlMessage *msg = NULL;
 449         long pos;
 450         int field;
 451         struct recptypes *recp = NULL;
 452         char target_room[ROOMNAMELEN];
 453         struct ser_ret sermsg;
 454         char *oldpath = NULL;
 455         char filename[PATH_MAX];
 456         FILE *fp;
 457         char nexthop[SIZ];
 458         unsigned char firstbyte;
 459         unsigned char lastbyte;
 460
 461         syslog(LOG_DEBUG, "network_process_buffer() processing %ld bytes\n", size);
 462
 463         /* Validate just a little bit.  First byte should be FF and * last byte should be 00. */
 464         firstbyte = buffer[0];
 465         lastbyte = buffer[size-1];
 466         if ( (firstbyte != 255) || (lastbyte != 0) ) {
 467                 syslog(LOG_ERR, "Corrupt message ignored.  Length=%ld, firstbyte = %d, lastbyte = %d\n",
 468                         size, firstbyte, lastbyte);
 469                 return;
 470         }
 471
 472         /* Set default target room to trash */
 473         strcpy(target_room, TWITROOM);
 474
 475         /* Load the message into memory */
 476         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
 477         memset(msg, 0, sizeof(struct CtdlMessage));
 478         msg->cm_magic = CTDLMESSAGE_MAGIC;
 479         msg->cm_anon_type = buffer[1];
 480         msg->cm_format_type = buffer[2];
 481
 482         for (pos = 3; pos < size; ++pos) {
 483                 field = buffer[pos];
 484                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
 485                 pos = pos + strlen(&buffer[(int)pos]);
 486         }
 487
 488         /* Check for message routing */
 489         if (msg->cm_fields['D'] != NULL) {
 490                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
 491
 492                         /* route the message */
 493                         strcpy(nexthop, "");
 494                         if (is_valid_node(nexthop, NULL, msg->cm_fields['D']) == 0) {
 495                                 /* prepend our node to the path */
 496                                 if (msg->cm_fields['P'] != NULL) {
 497                                         oldpath = msg->cm_fields['P'];
 498                                         msg->cm_fields['P'] = NULL;
 499                                 }
 500                                 else {
 501                                         oldpath = strdup("unknown_user");
 502                                 }
 503                                 size = strlen(oldpath) + SIZ;
 504                                 msg->cm_fields['P'] = malloc(size);
 505                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
 506                                         config.c_nodename, oldpath);
 507                                 free(oldpath);
 508
 509                                 /* serialize the message */
 510                                 serialize_message(&sermsg, msg);
 511
 512                                 /* now send it */
 513                                 if (IsEmptyStr(nexthop)) {
 514                                         strcpy(nexthop, msg->cm_fields['D']);
 515                                 }
 516                                 snprintf(filename,
 517                                         sizeof filename,
 518                                         "%s/%s@%lx%x",
 519                                         ctdl_netout_dir,
 520                                         nexthop,
 521                                         time(NULL),
 522                                         rand()
 523                                 );
 524                                 syslog(LOG_DEBUG, "Appending to %s\n", filename);
 525                                 fp = fopen(filename, "ab");
 526                                 if (fp != NULL) {
 527                                         fwrite(sermsg.ser, sermsg.len, 1, fp);
 528                                         fclose(fp);
 529                                 }
 530                                 else {
 531                                         syslog(LOG_ERR, "%s: %s\n", filename, strerror(errno));
 532                                 }
 533                                 free(sermsg.ser);
 534                                 CtdlFreeMessage(msg);
 535                                 return;
 536                         }
 537
 538                         else {  /* invalid destination node name */
 539
 540                                 network_bounce(msg,
 541 "A message you sent could not be delivered due to an invalid destination node"
 542 " name.  Please check the address and try sending the message again.\n");
 543                                 msg = NULL;
 544                                 return;
 545
 546                         }
 547                 }
 548         }
 549
 550         /*
 551          * Check to see if we already have a copy of this message, and
 552          * abort its processing if so.  (We used to post a warning to Aide>
 553          * every time this happened, but the network is now so densely
 554          * connected that it's inevitable.)
 555          */
 556         if (network_usetable(msg) != 0) {
 557                 CtdlFreeMessage(msg);
 558                 return;
 559         }
 560
 561         /* Learn network topology from the path */
 562         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
 563                 network_learn_topology(msg->cm_fields['N'], msg->cm_fields['P']);
 564         }
 565
 566         /* Is the sending node giving us a very persuasive suggestion about
 567          * which room this message should be saved in?  If so, go with that.
 568          */
 569         if (msg->cm_fields['C'] != NULL) {
 570                 safestrncpy(target_room, msg->cm_fields['C'], sizeof target_room);
 571         }
 572
 573         /* Otherwise, does it have a recipient?  If so, validate it... */
 574         else if (msg->cm_fields['R'] != NULL) {
 575                 recp = validate_recipients(msg->cm_fields['R'], NULL, 0);
 576                 if (recp != NULL) if (recp->num_error != 0) {
 577                         network_bounce(msg,
 578                                 "A message you sent could not be delivered due to an invalid address.\n"
 579                                 "Please check the address and try sending the message again.\n");
 580                         msg = NULL;
 581                         free_recipients(recp);
 582                         syslog(LOG_DEBUG, "Bouncing message due to invalid recipient address.\n");
 583                         return;
 584                 }
 585                 strcpy(target_room, "");        /* no target room if mail */
 586         }
 587
 588         /* Our last shot at finding a home for this message is to see if
 589          * it has the O field (Originating room) set.
 590          */
 591         else if (msg->cm_fields['O'] != NULL) {
 592                 safestrncpy(target_room, msg->cm_fields['O'], sizeof target_room);
 593         }
 594
 595         /* Strip out fields that are only relevant during transit */
 596         if (msg->cm_fields['D'] != NULL) {
 597                 free(msg->cm_fields['D']);
 598                 msg->cm_fields['D'] = NULL;
 599         }
 600         if (msg->cm_fields['C'] != NULL) {
 601                 free(msg->cm_fields['C']);
 602                 msg->cm_fields['C'] = NULL;
 603         }
 604
 605         /* save the message into a room */
 606         if (PerformNetprocHooks(msg, target_room) == 0) {
 607                 msg->cm_flags = CM_SKIP_HOOKS;
 608                 CtdlSubmitMsg(msg, recp, target_room, 0);
 609         }
 610         CtdlFreeMessage(msg);
 611         free_recipients(recp);
 612 }
 613
 614
 615 /*
 616  * Process a single message from a single file from the inbound queue
 617  */
 618 void network_process_message(FILE *fp, long msgstart, long msgend) {
 619         long hold_pos;
 620         long size;
 621         char *buffer;
 622
 623         hold_pos = ftell(fp);
 624         size = msgend - msgstart + 1;
 625         buffer = malloc(size);
 626         if (buffer != NULL) {
 627                 fseek(fp, msgstart, SEEK_SET);
 628                 if (fread(buffer, size, 1, fp) > 0) {
 629                         network_process_buffer(buffer, size);
 630                 }
 631                 free(buffer);
 632         }
 633
 634         fseek(fp, hold_pos, SEEK_SET);
 635 }
 636
 637
 638 /*
 639  * Process a single file from the inbound queue
 640  */
 641 void network_process_file(char *filename) {
 642         FILE *fp;
 643         long msgstart = (-1L);
 644         long msgend = (-1L);
 645         long msgcur = 0L;
 646         int ch;
 647
 648
 649         fp = fopen(filename, "rb");
 650         if (fp == NULL) {
 651                 syslog(LOG_CRIT, "Error opening %s: %s\n", filename, strerror(errno));
 652                 return;
 653         }
 654
 655         fseek(fp, 0L, SEEK_END);
 656         syslog(LOG_INFO, "network: processing %ld bytes from %s\n", ftell(fp), filename);
 657         rewind(fp);
 658
 659         /* Look for messages in the data stream and break them out */
 660         while (ch = getc(fp), ch >= 0) {
 661
 662                 if (ch == 255) {
 663                         if (msgstart >= 0L) {
 664                                 msgend = msgcur - 1;
 665                                 network_process_message(fp, msgstart, msgend);
 666                         }
 667                         msgstart = msgcur;
 668                 }
 669
 670                 ++msgcur;
 671         }
 672
 673         msgend = msgcur - 1;
 674         if (msgstart >= 0L) {
 675                 network_process_message(fp, msgstart, msgend);
 676         }
 677
 678         fclose(fp);
 679         unlink(filename);
 680 }
 681
 682
 683 /*
 684  * Process anything in the inbound queue
 685  */
 686 void network_do_spoolin(void) {
 687         DIR *dp;
 688         struct dirent *d;
 689         struct stat statbuf;
 690         char filename[PATH_MAX];
 691         static time_t last_spoolin_mtime = 0L;
 692
 693         /*
 694          * Check the spoolin directory's modification time.  If it hasn't
 695          * been touched, we don't need to scan it.
 696          */
 697         if (stat(ctdl_netin_dir, &statbuf)) return;
 698         if (statbuf.st_mtime == last_spoolin_mtime) {
 699                 syslog(LOG_DEBUG, "network: nothing in inbound queue\n");
 700                 return;
 701         }
 702         last_spoolin_mtime = statbuf.st_mtime;
 703         syslog(LOG_DEBUG, "network: processing inbound queue\n");
 704
 705         /*
 706          * Ok, there's something interesting in there, so scan it.
 707          */
 708         dp = opendir(ctdl_netin_dir);
 709         if (dp == NULL) return;
 710
 711         while (d = readdir(dp), d != NULL) {
 712                 if ((strcmp(d->d_name, ".")) && (strcmp(d->d_name, ".."))) {
 713                         snprintf(filename,
 714                                 sizeof filename,
 715                                 "%s/%s",
 716                                 ctdl_netin_dir,
 717                                 d->d_name
 718                         );
 719                         network_process_file(filename);
 720                 }
 721         }
 722
 723         closedir(dp);
 724 }
 725
 726 /*
 727  * Step 1: consolidate files in the outbound queue into one file per neighbor node
 728  * Step 2: delete any files in the outbound queue that were for neighbors who no longer exist.
 729  */
 730 void network_consolidate_spoolout(void) {
 731         DIR *dp;
 732         struct dirent *d;
 733         char filename[PATH_MAX];
 734         char cmd[PATH_MAX];
 735         char nexthop[256];
 736         int i;
 737         char *ptr;
 738
 739         /* Step 1: consolidate files in the outbound queue into one file per neighbor node */
 740         dp = opendir(ctdl_netout_dir);
 741         if (dp == NULL) return;
 742         while (d = readdir(dp), d != NULL) {
 743                 if (
 744                         (strcmp(d->d_name, "."))
 745                         && (strcmp(d->d_name, ".."))
 746                         && (strchr(d->d_name, '@') != NULL)
 747                 ) {
 748                         safestrncpy(nexthop, d->d_name, sizeof nexthop);
 749                         ptr = strchr(nexthop, '@');
 750                         if (ptr) *ptr = 0;
 751
 752                         snprintf(filename,
 753                                 sizeof filename,
 754                                 "%s/%s",
 755                                 ctdl_netout_dir,
 756                                 d->d_name
 757                         );
 758
 759                         syslog(LOG_DEBUG, "Consolidate %s to %s\n", filename, nexthop);
 760                         if (network_talking_to(nexthop, NTT_CHECK)) {
 761                                 syslog(LOG_DEBUG,
 762                                         "Currently online with %s - skipping for now\n",
 763                                         nexthop
 764                                 );
 765                         }
 766                         else {
 767                                 network_talking_to(nexthop, NTT_ADD);
 768                                 snprintf(cmd, sizeof cmd, "/bin/cat %s >>%s/%s && /bin/rm -f %s",
 769                                         filename,
 770                                         ctdl_netout_dir, nexthop,
 771                                         filename
 772                                 );
 773                                 system(cmd);
 774                                 network_talking_to(nexthop, NTT_REMOVE);
 775                         }
 776                 }
 777         }
 778         closedir(dp);
 779
 780         /* Step 2: delete any files in the outbound queue that were for neighbors who no longer exist */
 781
 782         dp = opendir(ctdl_netout_dir);
 783         if (dp == NULL) return;
 784
 785         while (d = readdir(dp), d != NULL) {
 786                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
 787                         continue;
 788                 ptr = strchr(d->d_name, '@');
 789                 if (d != NULL)
 790                         continue;
 791                 snprintf(filename,
 792                         sizeof filename,
 793                         "%s/%s",
 794                         ctdl_netout_dir,
 795                         d->d_name
 796                 );
 797
 798                 strcpy(nexthop, "");
 799                 i = is_valid_node(nexthop, NULL, d->d_name);
 800
 801                 if ( (i != 0) || !IsEmptyStr(nexthop) ) {
 802                         unlink(filename);
 803                 }
 804         }
 805
 806
 807         closedir(dp);
 808 }
 809
 810
 811
 812
 813 /*
 814  * It's ok if these directories already exist.  Just fail silently.
 815  */
 816 void create_spool_dirs(void) {
 817         if ((mkdir(ctdl_spool_dir, 0700) != 0) && (errno != EEXIST))
 818                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_spool_dir, strerror(errno));
 819         if (chown(ctdl_spool_dir, CTDLUID, (-1)) != 0)
 820                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_spool_dir, strerror(errno));
 821         if ((mkdir(ctdl_netin_dir, 0700) != 0) && (errno != EEXIST))
 822                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_netin_dir, strerror(errno));
 823         if (chown(ctdl_netin_dir, CTDLUID, (-1)) != 0)
 824                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netin_dir, strerror(errno));
 825         if ((mkdir(ctdl_nettmp_dir, 0700) != 0) && (errno != EEXIST))
 826                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_nettmp_dir, strerror(errno));
 827         if (chown(ctdl_nettmp_dir, CTDLUID, (-1)) != 0)
 828                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_nettmp_dir, strerror(errno));
 829         if ((mkdir(ctdl_netout_dir, 0700) != 0) && (errno != EEXIST))
 830                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_netout_dir, strerror(errno));
 831         if (chown(ctdl_netout_dir, CTDLUID, (-1)) != 0)
 832                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netout_dir, strerror(errno));
 833 }
 834
 835 /*
 836  * Module entry point
 837  */
 838 CTDL_MODULE_INIT(network_spool)
 839 {
 840         if (!threading)
 841         {
 842                 create_spool_dirs();
 843                 CtdlRegisterCleanupHook(destroy_network_queue_room);
 844         }
 845         return "network_spool";
 846 }