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) 2000-2012 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, version 3.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  16  * This is a fairly high-level type of critical section.  It ensures that no
  17  * two threads work on the netconfigs files at the same time.  Since we do
  18  * so many things inside these, here are the rules:
  19  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  20  *  2. Do *not* perform any I/O with the client during these sections.
  21  *
  22  */
  23
  24 /*
  25  * Duration of time (in seconds) after which pending list subscribe/unsubscribe
  26  * requests that have not been confirmed will be deleted.
  27  */
  28 #define EXP     259200  /* three days */
  29
  30 #include "sysdep.h"
  31 #include <stdlib.h>
  32 #include <unistd.h>
  33 #include <stdio.h>
  34 #include <fcntl.h>
  35 #include <ctype.h>
  36 #include <signal.h>
  37 #include <pwd.h>
  38 #include <errno.h>
  39 #include <sys/stat.h>
  40 #include <sys/types.h>
  41 #include <dirent.h>
  42 #if TIME_WITH_SYS_TIME
  43 # include <sys/time.h>
  44 # include <time.h>
  45 #else
  46 # if HAVE_SYS_TIME_H
  47 #  include <sys/time.h>
  48 # else
  49 #  include <time.h>
  50 # endif
  51 #endif
  52 #ifdef HAVE_SYSCALL_H
  53 # include <syscall.h>
  54 #else
  55 # if HAVE_SYS_SYSCALL_H
  56 #  include <sys/syscall.h>
  57 # endif
  58 #endif
  59
  60 #include <sys/wait.h>
  61 #include <string.h>
  62 #include <limits.h>
  63 #include <libcitadel.h>
  64 #include "citadel.h"
  65 #include "server.h"
  66 #include "citserver.h"
  67 #include "support.h"
  68 #include "config.h"
  69 #include "user_ops.h"
  70 #include "database.h"
  71 #include "msgbase.h"
  72 #include "internet_addressing.h"
  73 #include "serv_network.h"
  74 #include "clientsocket.h"
  75 #include "file_ops.h"
  76 #include "citadel_dirs.h"
  77 #include "threads.h"
  78 #include "context.h"
  79 #include "ctdl_module.h"
  80 #include "netspool.h"
  81 #include "netmail.h"
  82
  83 int NetQDebugEnabled = 0;
  84 struct CitContext networker_spool_CC;
  85
  86 /* comes from lookup3.c from libcitadel... */
  87 extern uint32_t hashlittle( const void *key, size_t length, uint32_t initval);
  88
  89 typedef struct __roomlists {
  90         RoomProcList *rplist;
  91 }roomlists;
  92 /*
  93  * When we do network processing, it's accomplished in two passes; one to
  94  * gather a list of rooms and one to actually do them.  It's ok that rplist
  95  * is global; we have a mutex that keeps it safe.
  96  */
  97 struct RoomProcList *rplist = NULL;
  98
  99
 100
 101 /*
 102  * Check the use table.  This is a list of messages which have recently
 103  * arrived on the system.  It is maintained and queried to prevent the same
 104  * message from being entered into the database multiple times if it happens
 105  * to arrive multiple times by accident.
 106  */
 107 int network_usetable(struct CtdlMessage *msg)
 108 {
 109         StrBuf *msgid;
 110         struct CitContext *CCC = CC;
 111         time_t now;
 112
 113         /* Bail out if we can't generate a message ID */
 114         if ((msg == NULL) || (msg->cm_fields[emessageId] == NULL) || (IsEmptyStr(msg->cm_fields[emessageId])))
 115         {
 116                 return(0);
 117         }
 118
 119         /* Generate the message ID */
 120         msgid = NewStrBufPlain(msg->cm_fields[emessageId], -1);
 121         if (haschar(ChrPtr(msgid), '@') == 0) {
 122                 StrBufAppendBufPlain(msgid, HKEY("@"), 0);
 123                 if (msg->cm_fields[eNodeName] != NULL) {
 124                         StrBufAppendBufPlain(msgid, msg->cm_fields[eNodeName], -1, 0);
 125                 }
 126                 else {
 127                         FreeStrBuf(&msgid);
 128                         return(0);
 129                 }
 130         }
 131         now = time(NULL);
 132         if (CheckIfAlreadySeen("Networker Import",
 133                                msgid,
 134                                now, 0,
 135                                eCheckUpdate,
 136                                CCC->cs_pid, 0) != 0)
 137         {
 138                 FreeStrBuf(&msgid);
 139                 return(1);
 140         }
 141         FreeStrBuf(&msgid);
 142
 143         return(0);
 144 }
 145
 146
 147
 148 /*
 149  * Send the *entire* contents of the current room to one specific network node,
 150  * ignoring anything we know about which messages have already undergone
 151  * network processing.  This can be used to bring a new node into sync.
 152  */
 153 int network_sync_to(char *target_node, long len)
 154 {
 155         struct CitContext *CCC = CC;
 156         OneRoomNetCfg OneRNCFG;
 157         OneRoomNetCfg *pRNCFG;
 158         const RoomNetCfgLine *pCfgLine;
 159         SpoolControl sc;
 160         int num_spooled = 0;
 161
 162         /* Grab the configuration line we're looking for */
 163         begin_critical_section(S_NETCONFIGS);
 164         pRNCFG = CtdlGetNetCfgForRoom(CCC->room.QRnumber);
 165         if ((pRNCFG == NULL) ||
 166             (pRNCFG->NetConfigs[ignet_push_share] == NULL))
 167         {
 168                 return -1;
 169         }
 170
 171         pCfgLine = pRNCFG->NetConfigs[ignet_push_share];
 172         while (pCfgLine != NULL)
 173         {
 174                 if (!strcmp(ChrPtr(pCfgLine->Value[0]), target_node))
 175                         break;
 176                 pCfgLine = pCfgLine->next;
 177         }
 178         if (pCfgLine == NULL)
 179         {
 180                 return -1;
 181         }
 182
 183         memset(&sc, 0, sizeof(SpoolControl));
 184         memset(&OneRNCFG, 0, sizeof(OneRoomNetCfg));
 185         sc.RNCfg = &OneRNCFG;
 186         sc.RNCfg->NetConfigs[ignet_push_share] = DuplicateOneGenericCfgLine(pCfgLine);
 187         sc.Users[ignet_push_share] = NewStrBufPlain(NULL,
 188                                                     StrLength(pCfgLine->Value[0]) +
 189                                                     StrLength(pCfgLine->Value[1]) + 10);
 190         StrBufAppendBuf(sc.Users[ignet_push_share],
 191                         pCfgLine->Value[0],
 192                         0);
 193         StrBufAppendBufPlain(sc.Users[ignet_push_share],
 194                              HKEY(","),
 195                              0);
 196
 197         StrBufAppendBuf(sc.Users[ignet_push_share],
 198                         pCfgLine->Value[1],
 199                         0);
 200         CalcListID(&sc);
 201
 202         end_critical_section(S_NETCONFIGS);
 203
 204         sc.working_ignetcfg = CtdlLoadIgNetCfg();
 205         sc.the_netmap = CtdlReadNetworkMap();
 206
 207         /* Send ALL messages */
 208         num_spooled = CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, NULL,
 209                 network_spool_msg, &sc);
 210
 211         /* Concise cleanup because we know there's only one node in the sc */
 212         DeleteGenericCfgLine(NULL/*TODO*/, &sc.RNCfg->NetConfigs[ignet_push_share]);
 213
 214         DeleteHash(&sc.working_ignetcfg);
 215         DeleteHash(&sc.the_netmap);
 216         free_spoolcontrol_struct_members(&sc);
 217
 218         QN_syslog(LOG_NOTICE, "Synchronized %d messages to <%s>\n",
 219                   num_spooled, target_node);
 220         return(num_spooled);
 221 }
 222
 223
 224 /*
 225  * Implements the NSYN command
 226  */
 227 void cmd_nsyn(char *argbuf) {
 228         int num_spooled;
 229         long len;
 230         char target_node[256];
 231
 232         if (CtdlAccessCheck(ac_aide)) return;
 233
 234         len = extract_token(target_node, argbuf, 0, '|', sizeof target_node);
 235         num_spooled = network_sync_to(target_node, len);
 236         if (num_spooled >= 0) {
 237                 cprintf("%d Spooled %d messages.\n", CIT_OK, num_spooled);
 238         }
 239         else {
 240                 cprintf("%d No such room/node share exists.\n",
 241                         ERROR + ROOM_NOT_FOUND);
 242         }
 243 }
 244
 245 RoomProcList *CreateRoomProcListEntry(struct ctdlroom *qrbuf, OneRoomNetCfg *OneRNCFG)
 246 {
 247         int i;
 248         struct RoomProcList *ptr;
 249
 250         ptr = (struct RoomProcList *) malloc(sizeof (struct RoomProcList));
 251         if (ptr == NULL) return NULL;
 252
 253         ptr->namelen = strlen(qrbuf->QRname);
 254         if (ptr->namelen > ROOMNAMELEN)
 255                 ptr->namelen = ROOMNAMELEN - 1;
 256
 257         memcpy (ptr->name, qrbuf->QRname, ptr->namelen);
 258         ptr->name[ptr->namelen] = '\0';
 259         ptr->QRNum = qrbuf->QRnumber;
 260
 261         for (i = 0; i < ptr->namelen; i++)
 262         {
 263                 ptr->lcname[i] = tolower(ptr->name[i]);
 264         }
 265
 266         ptr->lcname[ptr->namelen] = '\0';
 267         ptr->key = hashlittle(ptr->lcname, ptr->namelen, 9872345);
 268         ptr->lastsent = OneRNCFG->lastsent;
 269         ptr->OneRNCfg = OneRNCFG;
 270         return ptr;
 271 }
 272
 273 /*
 274  * Batch up and send all outbound traffic from the current room
 275  */
 276 void network_queue_interesting_rooms(struct ctdlroom *qrbuf, void *data, OneRoomNetCfg *OneRNCfg)
 277 {
 278         struct RoomProcList *ptr;
 279         roomlists *RP = (roomlists*) data;
 280
 281         if (!HaveSpoolConfig(OneRNCfg))
 282                 return;
 283
 284         ptr = CreateRoomProcListEntry(qrbuf, OneRNCfg);
 285
 286         if (ptr != NULL)
 287         {
 288                 ptr->next = RP->rplist;
 289                 RP->rplist = ptr;
 290         }
 291 }
 292
 293 /*
 294  * Batch up and send all outbound traffic from the current room
 295  */
 296 int network_room_handler (struct ctdlroom *qrbuf)
 297 {
 298         struct RoomProcList *ptr;
 299         OneRoomNetCfg* RNCfg;
 300
 301         if (qrbuf->QRdefaultview == VIEW_QUEUE)
 302                 return 1;
 303
 304         RNCfg = CtdlGetNetCfgForRoom(qrbuf->QRnumber);
 305         if (RNCfg == NULL)
 306                 return 1;
 307
 308         if (!HaveSpoolConfig(RNCfg))
 309                 return 1;
 310
 311         ptr = CreateRoomProcListEntry(qrbuf, RNCfg);
 312         if (ptr == NULL)
 313                 return 1;
 314
 315         ptr->OneRNCfg = NULL;
 316         begin_critical_section(S_RPLIST);
 317         ptr->next = rplist;
 318         rplist = ptr;
 319         end_critical_section(S_RPLIST);
 320         return 1;
 321 }
 322
 323 void destroy_network_queue_room(RoomProcList *rplist)
 324 {
 325         struct RoomProcList *cur, *p;
 326
 327         cur = rplist;
 328         while (cur != NULL)
 329         {
 330                 p = cur->next;
 331                 free (cur);
 332                 cur = p;
 333         }
 334 }
 335
 336 void destroy_network_queue_room_locked (void)
 337 {
 338         begin_critical_section(S_RPLIST);
 339         destroy_network_queue_room(rplist);
 340         end_critical_section(S_RPLIST);
 341 }
 342
 343
 344
 345 /*
 346  * Bounce a message back to the sender
 347  */
 348 void network_bounce(struct CtdlMessage *msg, char *reason)
 349 {
 350         struct CitContext *CCC = CC;
 351         char buf[SIZ];
 352         char bouncesource[SIZ];
 353         char recipient[SIZ];
 354         struct recptypes *valid = NULL;
 355         char force_room[ROOMNAMELEN];
 356         static int serialnum = 0;
 357         long len;
 358
 359         QNM_syslog(LOG_DEBUG, "entering network_bounce()\n");
 360
 361         if (msg == NULL) return;
 362
 363         snprintf(bouncesource, sizeof bouncesource, "%s@%s", BOUNCESOURCE, config.c_nodename);
 364
 365         /*
 366          * Give it a fresh message ID
 367          */
 368         len = snprintf(buf, sizeof(buf),
 369                        "%ld.%04lx.%04x@%s",
 370                        (long)time(NULL),
 371                        (long)getpid(),
 372                        ++serialnum,
 373                        config.c_fqdn);
 374
 375         CM_SetField(msg, emessageId, buf, len);
 376
 377         /*
 378          * FIXME ... right now we're just sending a bounce; we really want to
 379          * include the text of the bounced message.
 380          */
 381         CM_SetField(msg, eMesageText, reason, strlen(reason));
 382         msg->cm_format_type = 0;
 383
 384         /*
 385          * Turn the message around
 386          */
 387         CM_FlushField(msg, eRecipient);
 388         CM_FlushField(msg, eDestination);
 389
 390         len = snprintf(recipient, sizeof(recipient), "%s@%s",
 391                        msg->cm_fields[eAuthor],
 392                        msg->cm_fields[eNodeName]);
 393
 394         CM_SetField(msg, eAuthor, HKEY(BOUNCESOURCE));
 395         CM_SetField(msg, eNodeName, config.c_nodename, strlen(config.c_nodename));
 396         CM_SetField(msg, eMsgSubject, HKEY("Delivery Status Notification (Failure)"));
 397
 398         Netmap_AddMe(msg, HKEY("unknown_user"));
 399
 400         /* Now submit the message */
 401         valid = validate_recipients(recipient, NULL, 0);
 402         if (valid != NULL) if (valid->num_error != 0) {
 403                 free_recipients(valid);
 404                 valid = NULL;
 405         }
 406         if ( (valid == NULL) || (!strcasecmp(recipient, bouncesource)) ) {
 407                 strcpy(force_room, config.c_aideroom);
 408         }
 409         else {
 410                 strcpy(force_room, "");
 411         }
 412         if ( (valid == NULL) && IsEmptyStr(force_room) ) {
 413                 strcpy(force_room, config.c_aideroom);
 414         }
 415         CtdlSubmitMsg(msg, valid, force_room, 0);
 416
 417         /* Clean up */
 418         if (valid != NULL) free_recipients(valid);
 419         CtdlFreeMessage(msg);
 420         QNM_syslog(LOG_DEBUG, "leaving network_bounce()\n");
 421 }
 422
 423
 424
 425 /*
 426  * network_do_queue()
 427  *
 428  * Run through the rooms doing various types of network stuff.
 429  */
 430 void network_do_queue(void)
 431 {
 432         struct CitContext *CCC = CC;
 433         static time_t last_run = 0L;
 434         int full_processing = 1;
 435         HashList *working_ignetcfg;
 436         HashList *the_netmap = NULL;
 437         int netmap_changed = 0;
 438         roomlists RL;
 439         SpoolControl *sc = NULL;
 440         SpoolControl *pSC;
 441
 442         /*
 443          * Run the full set of processing tasks no more frequently
 444          * than once every n seconds
 445          */
 446         if ( (time(NULL) - last_run) < config.c_net_freq ) {
 447                 full_processing = 0;
 448                 syslog(LOG_DEBUG, "Network full processing in %ld seconds.\n",
 449                        config.c_net_freq - (time(NULL)- last_run)
 450                 );
 451         }
 452
 453         become_session(&networker_spool_CC);
 454         begin_critical_section(S_RPLIST);
 455         RL.rplist = rplist;
 456         rplist = NULL;
 457         end_critical_section(S_RPLIST);
 458 ///TODO hm, check whether we have a config at all here?
 459         /* Load the IGnet Configuration into memory */
 460         working_ignetcfg = CtdlLoadIgNetCfg();
 461
 462         /*
 463          * Load the network map and filter list into memory.
 464          */
 465         if (!server_shutting_down)
 466                 the_netmap = CtdlReadNetworkMap();
 467 #if 0
 468         /* filterlist isn't supported anymore
 469         if (!server_shutting_down)
 470                 load_network_filter_list();
 471         */
 472 #endif
 473
 474         /*
 475          * Go ahead and run the queue
 476          */
 477         if (full_processing && !server_shutting_down) {
 478                 QNM_syslog(LOG_DEBUG, "network: loading outbound queue");
 479                 CtdlForEachNetCfgRoom(network_queue_interesting_rooms, &RL, maxRoomNetCfg);
 480         }
 481
 482         if ((RL.rplist != NULL) && (!server_shutting_down)) {
 483                 RoomProcList *ptr, *cmp;
 484                 ptr = RL.rplist;
 485                 QNM_syslog(LOG_DEBUG, "network: running outbound queue");
 486                 while (ptr != NULL && !server_shutting_down) {
 487
 488                         cmp = ptr->next;
 489                         /* filter duplicates from the list... */
 490                         while (cmp != NULL) {
 491                                 if ((cmp->namelen > 0) &&
 492                                     (cmp->key == ptr->key) &&
 493                                     (cmp->namelen == ptr->namelen) &&
 494                                     (strcmp(cmp->lcname, ptr->lcname) == 0))
 495                                 {
 496                                         cmp->namelen = 0;
 497                                 }
 498                                 cmp = cmp->next;
 499                         }
 500
 501                         if (ptr->namelen > 0) {
 502                                 InspectQueuedRoom(&sc,
 503                                                   ptr,
 504                                                   working_ignetcfg,
 505                                                   the_netmap);
 506                         }
 507                         ptr = ptr->next;
 508                 }
 509         }
 510
 511
 512         pSC = sc;
 513         while (pSC != NULL)
 514         {
 515                 network_spoolout_room(pSC);
 516                 pSC = pSC->next;
 517         }
 518
 519         pSC = sc;
 520         while (pSC != NULL)
 521         {
 522                 sc = pSC->next;
 523                 free_spoolcontrol_struct(&pSC);
 524                 pSC = sc;
 525         }
 526         /* If there is anything in the inbound queue, process it */
 527         if (!server_shutting_down) {
 528                 network_do_spoolin(working_ignetcfg,
 529                                    the_netmap,
 530                                    &netmap_changed);
 531         }
 532
 533         /* Free the filter list in memory */
 534         free_netfilter_list();
 535
 536         /* Save the network map back to disk */
 537         if (netmap_changed) {
 538                 StrBuf *MapStr = CtdlSerializeNetworkMap(the_netmap);
 539                 char *pMapStr = SmashStrBuf(&MapStr);
 540                 CtdlPutSysConfig(IGNETMAP, pMapStr);
 541                 free(pMapStr);
 542         }
 543
 544         /* combine singe message files into one spool entry per remote node. */
 545         network_consolidate_spoolout(working_ignetcfg, the_netmap);
 546
 547         /* shut down. */
 548
 549         DeleteHash(&the_netmap);
 550
 551         DeleteHash(&working_ignetcfg);
 552
 553         QNM_syslog(LOG_DEBUG, "network: queue run completed");
 554
 555         if (full_processing) {
 556                 last_run = time(NULL);
 557         }
 558         destroy_network_queue_room(RL.rplist);
 559         SaveChangedConfigs();
 560
 561 }
 562
 563
 564
 565
 566
 567
 568
 569
 570 void network_logout_hook(void)
 571 {
 572         CitContext *CCC = MyContext();
 573
 574         /*
 575          * If we were talking to a network node, we're not anymore...
 576          */
 577         if (!IsEmptyStr(CCC->net_node)) {
 578                 CtdlNetworkTalkingTo(CCC->net_node, strlen(CCC->net_node), NTT_REMOVE);
 579                 CCC->net_node[0] = '\0';
 580         }
 581 }
 582 void network_cleanup_function(void)
 583 {
 584         struct CitContext *CCC = CC;
 585
 586         if (!IsEmptyStr(CCC->net_node)) {
 587                 CtdlNetworkTalkingTo(CCC->net_node, strlen(CCC->net_node), NTT_REMOVE);
 588                 CCC->net_node[0] = '\0';
 589         }
 590 }
 591
 592
 593 /*
 594  * Module entry point
 595  */
 596
 597 void SetNetQDebugEnabled(const int n)
 598 {
 599         NetQDebugEnabled = n;
 600 }
 601
 602 CTDL_MODULE_INIT(network)
 603 {
 604         if (!threading)
 605         {
 606                 CtdlFillSystemContext(&networker_spool_CC, "CitNetSpool");
 607                 CtdlRegisterDebugFlagHook(HKEY("networkqueue"), SetNetQDebugEnabled, &NetQDebugEnabled);
 608                 CtdlRegisterSessionHook(network_cleanup_function, EVT_STOP, PRIO_STOP + 30);
 609                 CtdlRegisterSessionHook(network_logout_hook, EVT_LOGOUT, PRIO_LOGOUT + 10);
 610                 CtdlRegisterProtoHook(cmd_nsyn, "NSYN", "Synchronize room to node");
 611                 CtdlRegisterRoomHook(network_room_handler);
 612                 CtdlRegisterCleanupHook(destroy_network_queue_room_locked);
 613                 CtdlRegisterSessionHook(network_do_queue, EVT_TIMER, PRIO_QUEUE + 10);
 614         }
 615         return "network";
 616 }