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 "netspool.h"
  92 #include "netmail.h"
  93 #include "ctdl_module.h"
  94
  95 /*
  96  * Learn topology from path fields
  97  */
  98 void network_learn_topology(char *node, char *path) {
  99         char nexthop[256];
 100         NetMap *nmptr;
 101
 102         strcpy(nexthop, "");
 103
 104         if (num_tokens(path, '!') < 3) return;
 105         for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
 106                 if (!strcasecmp(nmptr->nodename, node)) {
 107                         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
 108                         nmptr->lastcontact = time(NULL);
 109                         ++netmap_changed;
 110                         return;
 111                 }
 112         }
 113
 114         /* If we got here then it's not in the map, so add it. */
 115         nmptr = (NetMap *) malloc(sizeof (NetMap));
 116         strcpy(nmptr->nodename, node);
 117         nmptr->lastcontact = time(NULL);
 118         extract_token(nmptr->nexthop, path, 0, '!', sizeof nmptr->nexthop);
 119         nmptr->next = the_netmap;
 120         the_netmap = nmptr;
 121         ++netmap_changed;
 122 }
 123
 124
 125
 126
 127 int read_spoolcontrol_file(SpoolControl **scc, char *filename)
 128 {
 129         FILE *fp;
 130         char instr[SIZ];
 131         char buf[SIZ];
 132         char nodename[256];
 133         char roomname[ROOMNAMELEN];
 134         size_t miscsize = 0;
 135         size_t linesize = 0;
 136         int skipthisline = 0;
 137         namelist *nptr = NULL;
 138         maplist *mptr = NULL;
 139         SpoolControl *sc;
 140
 141         fp = fopen(filename, "r");
 142         if (fp == NULL) {
 143                 return 0;
 144         }
 145         sc = malloc(sizeof(SpoolControl));
 146         memset(sc, 0, sizeof(SpoolControl));
 147         *scc = sc;
 148
 149         while (fgets(buf, sizeof buf, fp) != NULL) {
 150                 buf[strlen(buf)-1] = 0;
 151
 152                 extract_token(instr, buf, 0, '|', sizeof instr);
 153                 if (!strcasecmp(instr, strof(lastsent))) {
 154                         sc->lastsent = extract_long(buf, 1);
 155                 }
 156                 else if (!strcasecmp(instr, strof(listrecp))) {
 157                         nptr = (namelist *)
 158                                 malloc(sizeof(namelist));
 159                         nptr->next = sc->listrecps;
 160                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 161                         sc->listrecps = nptr;
 162                 }
 163                 else if (!strcasecmp(instr, strof(participate))) {
 164                         nptr = (namelist *)
 165                                 malloc(sizeof(namelist));
 166                         nptr->next = sc->participates;
 167                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 168                         sc->participates = nptr;
 169                 }
 170                 else if (!strcasecmp(instr, strof(digestrecp))) {
 171                         nptr = (namelist *)
 172                                 malloc(sizeof(namelist));
 173                         nptr->next = sc->digestrecps;
 174                         extract_token(nptr->name, buf, 1, '|', sizeof nptr->name);
 175                         sc->digestrecps = nptr;
 176                 }
 177                 else if (!strcasecmp(instr, strof(ignet_push_share))) {
 178                         extract_token(nodename, buf, 1, '|', sizeof nodename);
 179                         extract_token(roomname, buf, 2, '|', sizeof roomname);
 180                         mptr = (maplist *) malloc(sizeof(maplist));
 181                         mptr->next = sc->ignet_push_shares;
 182                         strcpy(mptr->remote_nodename, nodename);
 183                         strcpy(mptr->remote_roomname, roomname);
 184                         sc->ignet_push_shares = mptr;
 185                 }
 186                 else {
 187                         /* Preserve 'other' lines ... *unless* they happen to
 188                          * be subscribe/unsubscribe pendings with expired
 189                          * timestamps.
 190                          */
 191                         skipthisline = 0;
 192                         if (!strncasecmp(buf, strof(subpending)"|", 11)) {
 193                                 if (time(NULL) - extract_long(buf, 4) > EXP) {
 194                                         skipthisline = 1;
 195                                 }
 196                         }
 197                         if (!strncasecmp(buf, strof(unsubpending)"|", 13)) {
 198                                 if (time(NULL) - extract_long(buf, 3) > EXP) {
 199                                         skipthisline = 1;
 200                                 }
 201                         }
 202
 203                         if (skipthisline == 0) {
 204                                 linesize = strlen(buf);
 205                                 sc->misc = realloc(sc->misc,
 206                                         (miscsize + linesize + 2) );
 207                                 sprintf(&sc->misc[miscsize], "%s\n", buf);
 208                                 miscsize = miscsize + linesize + 1;
 209                         }
 210                 }
 211
 212
 213         }
 214         fclose(fp);
 215         return 1;
 216 }
 217
 218 void free_spoolcontrol_struct(SpoolControl **scc)
 219 {
 220         SpoolControl *sc;
 221         namelist *nptr = NULL;
 222         maplist *mptr = NULL;
 223
 224         sc = *scc;
 225         while (sc->listrecps != NULL) {
 226                 nptr = sc->listrecps->next;
 227                 free(sc->listrecps);
 228                 sc->listrecps = nptr;
 229         }
 230         /* Do the same for digestrecps */
 231         while (sc->digestrecps != NULL) {
 232                 nptr = sc->digestrecps->next;
 233                 free(sc->digestrecps);
 234                 sc->digestrecps = nptr;
 235         }
 236         /* Do the same for participates */
 237         while (sc->participates != NULL) {
 238                 nptr = sc->participates->next;
 239                 free(sc->participates);
 240                 sc->participates = nptr;
 241         }
 242         while (sc->ignet_push_shares != NULL) {
 243                 mptr = sc->ignet_push_shares->next;
 244                 free(sc->ignet_push_shares);
 245                 sc->ignet_push_shares = mptr;
 246         }
 247         free(sc->misc);
 248         free(sc);
 249         *scc=NULL;
 250 }
 251
 252 int writenfree_spoolcontrol_file(SpoolControl **scc, char *filename)
 253 {
 254         char tempfilename[PATH_MAX];
 255         int TmpFD;
 256         SpoolControl *sc;
 257         namelist *nptr = NULL;
 258         maplist *mptr = NULL;
 259         long len;
 260         time_t unixtime;
 261         struct timeval tv;
 262         long reltid; /* if we don't have SYS_gettid, use "random" value */
 263         StrBuf *Cfg;
 264         int rc;
 265
 266         len = strlen(filename);
 267         memcpy(tempfilename, filename, len + 1);
 268
 269
 270 #if defined(HAVE_SYSCALL_H) && defined (SYS_gettid)
 271         reltid = syscall(SYS_gettid);
 272 #endif
 273         gettimeofday(&tv, NULL);
 274         /* Promote to time_t; types differ on some OSes (like darwin) */
 275         unixtime = tv.tv_sec;
 276
 277         sprintf(tempfilename + len, ".%ld-%ld", reltid, unixtime);
 278         sc = *scc;
 279         errno = 0;
 280         TmpFD = open(tempfilename, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
 281         Cfg = NewStrBuf();
 282         if ((TmpFD < 0) || (errno != 0)) {
 283                 syslog(LOG_CRIT, "ERROR: cannot open %s: %s\n",
 284                         filename, strerror(errno));
 285                 free_spoolcontrol_struct(scc);
 286                 unlink(tempfilename);
 287         }
 288         else {
 289                 fchown(TmpFD, config.c_ctdluid, 0);
 290                 StrBufAppendPrintf(Cfg, "lastsent|%ld\n", sc->lastsent);
 291
 292                 /* Write out the listrecps while freeing from memory at the
 293                  * same time.  Am I clever or what?  :)
 294                  */
 295                 while (sc->listrecps != NULL) {
 296                     StrBufAppendPrintf(Cfg, "listrecp|%s\n", sc->listrecps->name);
 297                         nptr = sc->listrecps->next;
 298                         free(sc->listrecps);
 299                         sc->listrecps = nptr;
 300                 }
 301                 /* Do the same for digestrecps */
 302                 while (sc->digestrecps != NULL) {
 303                         StrBufAppendPrintf(Cfg, "digestrecp|%s\n", sc->digestrecps->name);
 304                         nptr = sc->digestrecps->next;
 305                         free(sc->digestrecps);
 306                         sc->digestrecps = nptr;
 307                 }
 308                 /* Do the same for participates */
 309                 while (sc->participates != NULL) {
 310                         StrBufAppendPrintf(Cfg, "participate|%s\n", sc->participates->name);
 311                         nptr = sc->participates->next;
 312                         free(sc->participates);
 313                         sc->participates = nptr;
 314                 }
 315                 while (sc->ignet_push_shares != NULL) {
 316                         StrBufAppendPrintf(Cfg, "ignet_push_share|%s", sc->ignet_push_shares->remote_nodename);
 317                         if (!IsEmptyStr(sc->ignet_push_shares->remote_roomname)) {
 318                                 StrBufAppendPrintf(Cfg, "|%s", sc->ignet_push_shares->remote_roomname);
 319                         }
 320                         StrBufAppendPrintf(Cfg, "\n");
 321                         mptr = sc->ignet_push_shares->next;
 322                         free(sc->ignet_push_shares);
 323                         sc->ignet_push_shares = mptr;
 324                 }
 325                 if (sc->misc != NULL) {
 326                         StrBufAppendBufPlain(Cfg, sc->misc, -1, 0);
 327                 }
 328                 free(sc->misc);
 329
 330                 rc = write(TmpFD, ChrPtr(Cfg), StrLength(Cfg));
 331                 if ((rc >=0 ) && (rc == StrLength(Cfg)))
 332                 {
 333                         close(TmpFD);
 334                         rename(tempfilename, filename);
 335                 }
 336                 else {
 337                         syslog(LOG_EMERG,
 338                                       "unable to write %s; [%s]; not enough space on the disk?\n",
 339                                       tempfilename,
 340                                       strerror(errno));
 341                         close(TmpFD);
 342                         unlink(tempfilename);
 343                 }
 344                 FreeStrBuf(&Cfg);
 345                 free(sc);
 346                 *scc=NULL;
 347         }
 348         return 1;
 349 }
 350 int is_recipient(SpoolControl *sc, const char *Name)
 351 {
 352         namelist *nptr;
 353         size_t len;
 354
 355         len = strlen(Name);
 356         nptr = sc->listrecps;
 357         while (nptr != NULL) {
 358                 if (strncmp(Name, nptr->name, len)==0)
 359                         return 1;
 360                 nptr = nptr->next;
 361         }
 362         /* Do the same for digestrecps */
 363         nptr = sc->digestrecps;
 364         while (nptr != NULL) {
 365                 if (strncmp(Name, nptr->name, len)==0)
 366                         return 1;
 367                 nptr = nptr->next;
 368         }
 369         /* Do the same for participates */
 370         nptr = sc->participates;
 371         while (nptr != NULL) {
 372                 if (strncmp(Name, nptr->name, len)==0)
 373                         return 1;
 374                 nptr = nptr->next;
 375         }
 376         return 0;
 377 }
 378
 379
 380 /*
 381  * Batch up and send all outbound traffic from the current room
 382  */
 383 void network_spoolout_room(char *room_to_spool) {
 384         char buf[SIZ];
 385         char filename[PATH_MAX];
 386         SpoolControl *sc;
 387         int i;
 388
 389         /*
 390          * If the room doesn't exist, don't try to perform its networking tasks.
 391          * Normally this should never happen, but once in a while maybe a room gets
 392          * queued for networking and then deleted before it can happen.
 393          */
 394         if (CtdlGetRoom(&CC->room, room_to_spool) != 0) {
 395                 syslog(LOG_CRIT, "ERROR: cannot load <%s>\n", room_to_spool);
 396                 return;
 397         }
 398
 399         assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
 400         begin_critical_section(S_NETCONFIGS);
 401
 402         /* Only do net processing for rooms that have netconfigs */
 403         if (!read_spoolcontrol_file(&sc, filename))
 404         {
 405                 end_critical_section(S_NETCONFIGS);
 406                 return;
 407         }
 408         syslog(LOG_INFO, "Networking started for <%s>\n", CC->room.QRname);
 409
 410         /* If there are digest recipients, we have to build a digest */
 411         if (sc->digestrecps != NULL) {
 412                 sc->digestfp = tmpfile();
 413                 fprintf(sc->digestfp, "Content-type: text/plain\n\n");
 414         }
 415
 416         /* Do something useful */
 417         CtdlForEachMessage(MSGS_GT, sc->lastsent, NULL, NULL, NULL,
 418                 network_spool_msg, sc);
 419
 420         /* If we wrote a digest, deliver it and then close it */
 421         snprintf(buf, sizeof buf, "room_%s@%s",
 422                 CC->room.QRname, config.c_fqdn);
 423         for (i=0; buf[i]; ++i) {
 424                 buf[i] = tolower(buf[i]);
 425                 if (isspace(buf[i])) buf[i] = '_';
 426         }
 427         if (sc->digestfp != NULL) {
 428                 fprintf(sc->digestfp,   " -----------------------------------"
 429                                         "------------------------------------"
 430                                         "-------\n"
 431                                         "You are subscribed to the '%s' "
 432                                         "list.\n"
 433                                         "To post to the list: %s\n",
 434                                         CC->room.QRname, buf
 435                 );
 436                 network_deliver_digest(sc);     /* deliver and close */
 437         }
 438
 439         /* Now rewrite the config file */
 440         writenfree_spoolcontrol_file(&sc, filename);
 441         end_critical_section(S_NETCONFIGS);
 442 }
 443
 444 /*
 445  * Process a buffer containing a single message from a single file
 446  * from the inbound queue
 447  */
 448 void network_process_buffer(char *buffer, long size) {
 449         struct CtdlMessage *msg = NULL;
 450         long pos;
 451         int field;
 452         struct recptypes *recp = NULL;
 453         char target_room[ROOMNAMELEN];
 454         struct ser_ret sermsg;
 455         char *oldpath = NULL;
 456         char filename[PATH_MAX];
 457         FILE *fp;
 458         char nexthop[SIZ];
 459         unsigned char firstbyte;
 460         unsigned char lastbyte;
 461
 462         syslog(LOG_DEBUG, "network_process_buffer() processing %ld bytes\n", size);
 463
 464         /* Validate just a little bit.  First byte should be FF and * last byte should be 00. */
 465         firstbyte = buffer[0];
 466         lastbyte = buffer[size-1];
 467         if ( (firstbyte != 255) || (lastbyte != 0) ) {
 468                 syslog(LOG_ERR, "Corrupt message ignored.  Length=%ld, firstbyte = %d, lastbyte = %d\n",
 469                         size, firstbyte, lastbyte);
 470                 return;
 471         }
 472
 473         /* Set default target room to trash */
 474         strcpy(target_room, TWITROOM);
 475
 476         /* Load the message into memory */
 477         msg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
 478         memset(msg, 0, sizeof(struct CtdlMessage));
 479         msg->cm_magic = CTDLMESSAGE_MAGIC;
 480         msg->cm_anon_type = buffer[1];
 481         msg->cm_format_type = buffer[2];
 482
 483         for (pos = 3; pos < size; ++pos) {
 484                 field = buffer[pos];
 485                 msg->cm_fields[field] = strdup(&buffer[pos+1]);
 486                 pos = pos + strlen(&buffer[(int)pos]);
 487         }
 488
 489         /* Check for message routing */
 490         if (msg->cm_fields['D'] != NULL) {
 491                 if (strcasecmp(msg->cm_fields['D'], config.c_nodename)) {
 492
 493                         /* route the message */
 494                         strcpy(nexthop, "");
 495                         if (is_valid_node(nexthop, NULL, msg->cm_fields['D']) == 0) {
 496                                 /* prepend our node to the path */
 497                                 if (msg->cm_fields['P'] != NULL) {
 498                                         oldpath = msg->cm_fields['P'];
 499                                         msg->cm_fields['P'] = NULL;
 500                                 }
 501                                 else {
 502                                         oldpath = strdup("unknown_user");
 503                                 }
 504                                 size = strlen(oldpath) + SIZ;
 505                                 msg->cm_fields['P'] = malloc(size);
 506                                 snprintf(msg->cm_fields['P'], size, "%s!%s",
 507                                         config.c_nodename, oldpath);
 508                                 free(oldpath);
 509
 510                                 /* serialize the message */
 511                                 serialize_message(&sermsg, msg);
 512
 513                                 /* now send it */
 514                                 if (IsEmptyStr(nexthop)) {
 515                                         strcpy(nexthop, msg->cm_fields['D']);
 516                                 }
 517                                 snprintf(filename,
 518                                         sizeof filename,
 519                                         "%s/%s@%lx%x",
 520                                         ctdl_netout_dir,
 521                                         nexthop,
 522                                         time(NULL),
 523                                         rand()
 524                                 );
 525                                 syslog(LOG_DEBUG, "Appending to %s\n", filename);
 526                                 fp = fopen(filename, "ab");
 527                                 if (fp != NULL) {
 528                                         fwrite(sermsg.ser, sermsg.len, 1, fp);
 529                                         fclose(fp);
 530                                 }
 531                                 else {
 532                                         syslog(LOG_ERR, "%s: %s\n", filename, strerror(errno));
 533                                 }
 534                                 free(sermsg.ser);
 535                                 CtdlFreeMessage(msg);
 536                                 return;
 537                         }
 538
 539                         else {  /* invalid destination node name */
 540
 541                                 network_bounce(msg,
 542 "A message you sent could not be delivered due to an invalid destination node"
 543 " name.  Please check the address and try sending the message again.\n");
 544                                 msg = NULL;
 545                                 return;
 546
 547                         }
 548                 }
 549         }
 550
 551         /*
 552          * Check to see if we already have a copy of this message, and
 553          * abort its processing if so.  (We used to post a warning to Aide>
 554          * every time this happened, but the network is now so densely
 555          * connected that it's inevitable.)
 556          */
 557         if (network_usetable(msg) != 0) {
 558                 CtdlFreeMessage(msg);
 559                 return;
 560         }
 561
 562         /* Learn network topology from the path */
 563         if ((msg->cm_fields['N'] != NULL) && (msg->cm_fields['P'] != NULL)) {
 564                 network_learn_topology(msg->cm_fields['N'], msg->cm_fields['P']);
 565         }
 566
 567         /* Is the sending node giving us a very persuasive suggestion about
 568          * which room this message should be saved in?  If so, go with that.
 569          */
 570         if (msg->cm_fields['C'] != NULL) {
 571                 safestrncpy(target_room, msg->cm_fields['C'], sizeof target_room);
 572         }
 573
 574         /* Otherwise, does it have a recipient?  If so, validate it... */
 575         else if (msg->cm_fields['R'] != NULL) {
 576                 recp = validate_recipients(msg->cm_fields['R'], NULL, 0);
 577                 if (recp != NULL) if (recp->num_error != 0) {
 578                         network_bounce(msg,
 579                                 "A message you sent could not be delivered due to an invalid address.\n"
 580                                 "Please check the address and try sending the message again.\n");
 581                         msg = NULL;
 582                         free_recipients(recp);
 583                         syslog(LOG_DEBUG, "Bouncing message due to invalid recipient address.\n");
 584                         return;
 585                 }
 586                 strcpy(target_room, "");        /* no target room if mail */
 587         }
 588
 589         /* Our last shot at finding a home for this message is to see if
 590          * it has the O field (Originating room) set.
 591          */
 592         else if (msg->cm_fields['O'] != NULL) {
 593                 safestrncpy(target_room, msg->cm_fields['O'], sizeof target_room);
 594         }
 595
 596         /* Strip out fields that are only relevant during transit */
 597         if (msg->cm_fields['D'] != NULL) {
 598                 free(msg->cm_fields['D']);
 599                 msg->cm_fields['D'] = NULL;
 600         }
 601         if (msg->cm_fields['C'] != NULL) {
 602                 free(msg->cm_fields['C']);
 603                 msg->cm_fields['C'] = NULL;
 604         }
 605
 606         /* save the message into a room */
 607         if (PerformNetprocHooks(msg, target_room) == 0) {
 608                 msg->cm_flags = CM_SKIP_HOOKS;
 609                 CtdlSubmitMsg(msg, recp, target_room, 0);
 610         }
 611         CtdlFreeMessage(msg);
 612         free_recipients(recp);
 613 }
 614
 615
 616 /*
 617  * Process a single message from a single file from the inbound queue
 618  */
 619 void network_process_message(FILE *fp, long msgstart, long msgend) {
 620         long hold_pos;
 621         long size;
 622         char *buffer;
 623
 624         hold_pos = ftell(fp);
 625         size = msgend - msgstart + 1;
 626         buffer = malloc(size);
 627         if (buffer != NULL) {
 628                 fseek(fp, msgstart, SEEK_SET);
 629                 if (fread(buffer, size, 1, fp) > 0) {
 630                         network_process_buffer(buffer, size);
 631                 }
 632                 free(buffer);
 633         }
 634
 635         fseek(fp, hold_pos, SEEK_SET);
 636 }
 637
 638
 639 /*
 640  * Process a single file from the inbound queue
 641  */
 642 void network_process_file(char *filename) {
 643         FILE *fp;
 644         long msgstart = (-1L);
 645         long msgend = (-1L);
 646         long msgcur = 0L;
 647         int ch;
 648
 649
 650         fp = fopen(filename, "rb");
 651         if (fp == NULL) {
 652                 syslog(LOG_CRIT, "Error opening %s: %s\n", filename, strerror(errno));
 653                 return;
 654         }
 655
 656         fseek(fp, 0L, SEEK_END);
 657         syslog(LOG_INFO, "network: processing %ld bytes from %s\n", ftell(fp), filename);
 658         rewind(fp);
 659
 660         /* Look for messages in the data stream and break them out */
 661         while (ch = getc(fp), ch >= 0) {
 662
 663                 if (ch == 255) {
 664                         if (msgstart >= 0L) {
 665                                 msgend = msgcur - 1;
 666                                 network_process_message(fp, msgstart, msgend);
 667                         }
 668                         msgstart = msgcur;
 669                 }
 670
 671                 ++msgcur;
 672         }
 673
 674         msgend = msgcur - 1;
 675         if (msgstart >= 0L) {
 676                 network_process_message(fp, msgstart, msgend);
 677         }
 678
 679         fclose(fp);
 680         unlink(filename);
 681 }
 682
 683
 684 /*
 685  * Process anything in the inbound queue
 686  */
 687 void network_do_spoolin(void) {
 688         DIR *dp;
 689         struct dirent *d;
 690         struct stat statbuf;
 691         char filename[PATH_MAX];
 692         static time_t last_spoolin_mtime = 0L;
 693
 694         /*
 695          * Check the spoolin directory's modification time.  If it hasn't
 696          * been touched, we don't need to scan it.
 697          */
 698         if (stat(ctdl_netin_dir, &statbuf)) return;
 699         if (statbuf.st_mtime == last_spoolin_mtime) {
 700                 syslog(LOG_DEBUG, "network: nothing in inbound queue\n");
 701                 return;
 702         }
 703         last_spoolin_mtime = statbuf.st_mtime;
 704         syslog(LOG_DEBUG, "network: processing inbound queue\n");
 705
 706         /*
 707          * Ok, there's something interesting in there, so scan it.
 708          */
 709         dp = opendir(ctdl_netin_dir);
 710         if (dp == NULL) return;
 711
 712         while (d = readdir(dp), d != NULL) {
 713                 if ((strcmp(d->d_name, ".")) && (strcmp(d->d_name, ".."))) {
 714                         snprintf(filename,
 715                                 sizeof filename,
 716                                 "%s/%s",
 717                                 ctdl_netin_dir,
 718                                 d->d_name
 719                         );
 720                         network_process_file(filename);
 721                 }
 722         }
 723
 724         closedir(dp);
 725 }
 726
 727 /*
 728  * Step 1: consolidate files in the outbound queue into one file per neighbor node
 729  * Step 2: delete any files in the outbound queue that were for neighbors who no longer exist.
 730  */
 731 void network_consolidate_spoolout(void) {
 732         DIR *dp;
 733         struct dirent *d;
 734         char filename[PATH_MAX];
 735         char cmd[PATH_MAX];
 736         char nexthop[256];
 737         int i;
 738         char *ptr;
 739
 740         /* Step 1: consolidate files in the outbound queue into one file per neighbor node */
 741         dp = opendir(ctdl_netout_dir);
 742         if (dp == NULL) return;
 743         while (d = readdir(dp), d != NULL) {
 744                 if (
 745                         (strcmp(d->d_name, "."))
 746                         && (strcmp(d->d_name, ".."))
 747                         && (strchr(d->d_name, '@') != NULL)
 748                 ) {
 749                         safestrncpy(nexthop, d->d_name, sizeof nexthop);
 750                         ptr = strchr(nexthop, '@');
 751                         if (ptr) *ptr = 0;
 752
 753                         snprintf(filename,
 754                                 sizeof filename,
 755                                 "%s/%s",
 756                                 ctdl_netout_dir,
 757                                 d->d_name
 758                         );
 759
 760                         syslog(LOG_DEBUG, "Consolidate %s to %s\n", filename, nexthop);
 761                         if (network_talking_to(nexthop, NTT_CHECK)) {
 762                                 syslog(LOG_DEBUG,
 763                                         "Currently online with %s - skipping for now\n",
 764                                         nexthop
 765                                 );
 766                         }
 767                         else {
 768                                 network_talking_to(nexthop, NTT_ADD);
 769                                 snprintf(cmd, sizeof cmd, "/bin/cat %s >>%s/%s && /bin/rm -f %s",
 770                                         filename,
 771                                         ctdl_netout_dir, nexthop,
 772                                         filename
 773                                 );
 774                                 system(cmd);
 775                                 network_talking_to(nexthop, NTT_REMOVE);
 776                         }
 777                 }
 778         }
 779         closedir(dp);
 780
 781         /* Step 2: delete any files in the outbound queue that were for neighbors who no longer exist */
 782
 783         dp = opendir(ctdl_netout_dir);
 784         if (dp == NULL) return;
 785
 786         while (d = readdir(dp), d != NULL) {
 787                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
 788                         continue;
 789                 ptr = strchr(d->d_name, '@');
 790                 if (d != NULL)
 791                         continue;
 792                 snprintf(filename,
 793                         sizeof filename,
 794                         "%s/%s",
 795                         ctdl_netout_dir,
 796                         d->d_name
 797                 );
 798
 799                 strcpy(nexthop, "");
 800                 i = is_valid_node(nexthop, NULL, d->d_name);
 801
 802                 if ( (i != 0) || !IsEmptyStr(nexthop) ) {
 803                         unlink(filename);
 804                 }
 805         }
 806
 807
 808         closedir(dp);
 809 }
 810
 811
 812
 813
 814 /*
 815  * It's ok if these directories already exist.  Just fail silently.
 816  */
 817 void create_spool_dirs(void) {
 818         if ((mkdir(ctdl_spool_dir, 0700) != 0) && (errno != EEXIST))
 819                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_spool_dir, strerror(errno));
 820         if (chown(ctdl_spool_dir, CTDLUID, (-1)) != 0)
 821                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_spool_dir, strerror(errno));
 822         if ((mkdir(ctdl_netin_dir, 0700) != 0) && (errno != EEXIST))
 823                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_netin_dir, strerror(errno));
 824         if (chown(ctdl_netin_dir, CTDLUID, (-1)) != 0)
 825                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netin_dir, strerror(errno));
 826         if ((mkdir(ctdl_nettmp_dir, 0700) != 0) && (errno != EEXIST))
 827                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_nettmp_dir, strerror(errno));
 828         if (chown(ctdl_nettmp_dir, CTDLUID, (-1)) != 0)
 829                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_nettmp_dir, strerror(errno));
 830         if ((mkdir(ctdl_netout_dir, 0700) != 0) && (errno != EEXIST))
 831                 syslog(LOG_EMERG, "unable to create directory [%s]: %s", ctdl_netout_dir, strerror(errno));
 832         if (chown(ctdl_netout_dir, CTDLUID, (-1)) != 0)
 833                 syslog(LOG_EMERG, "unable to set the access rights for [%s]: %s", ctdl_netout_dir, strerror(errno));
 834 }
 835
 836 /*
 837  * Module entry point
 838  */
 839 CTDL_MODULE_INIT(network_spool)
 840 {
 841         if (!threading)
 842         {
 843                 create_spool_dirs();
 844                 CtdlRegisterCleanupHook(destroy_network_queue_room);
 845         }
 846         return "network_spool";
 847 }