citadel/citserver.c

   1 /*
   2  * $Id$
   3  *
   4  * Main source module for the Citadel server
   5  *
   6  */
   7
   8 #include "sysdep.h"
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <stdio.h>
  12 #include <fcntl.h>
  13 #include <signal.h>
  14 #include <time.h>
  15 #include <ctype.h>
  16 #include <string.h>
  17 #include <errno.h>
  18 #include <limits.h>
  19 #include <syslog.h>
  20 #include <dlfcn.h>
  21 #include <netdb.h>
  22 #include <sys/types.h>
  23 #include <sys/socket.h>
  24 #include <netinet/in.h>
  25 #include <arpa/inet.h>
  26 #include "citadel.h"
  27 #include "server.h"
  28 #include "sysdep_decls.h"
  29 #include "citserver.h"
  30 #include "config.h"
  31 #include "database.h"
  32 #include "housekeeping.h"
  33 #include "user_ops.h"
  34 #include "logging.h"
  35 #include "msgbase.h"
  36 #include "support.h"
  37 #include "locate_host.h"
  38 #include "room_ops.h"
  39 #include "file_ops.h"
  40 #include "dynloader.h"
  41 #include "policy.h"
  42 #include "control.h"
  43 #include "tools.h"
  44
  45 struct CitContext *ContextList = NULL;
  46 char *unique_session_numbers;
  47 int ScheduledShutdown = 0;
  48 int do_defrag = 0;
  49
  50 /*
  51  * Various things that need to be initialized at startup
  52  */
  53 void master_startup(void) {
  54         lprintf(7, "Opening databases\n");
  55         open_databases();
  56
  57         if (do_defrag)
  58                 defrag_databases();
  59
  60         lprintf(7, "Checking floor reference counts\n");
  61         check_ref_counts();
  62
  63         lprintf(7, "Creating base rooms (if necessary)\n");
  64         create_room(BASEROOM,           0, "", 0);
  65         create_room(AIDEROOM,           3, "", 0);
  66         create_room(SYSCONFIGROOM,      3, "", 0);
  67         create_room(config.c_twitroom,  0, "", 0);
  68         }
  69
  70 /*
  71  * Cleanup routine to be called when the server is shutting down.
  72  */
  73 void master_cleanup(void) {
  74         struct CleanupFunctionHook *fcn;
  75
  76         /* Cancel all running sessions */
  77         lprintf(7, "Cancelling running sessions...\n");
  78
  79 /* FIXME do something here
  80         while (ContextList != NULL) {
  81                 }
  82  */
  83
  84         /* Run any cleanup routines registered by loadable modules */
  85         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
  86                 (*fcn->h_function_pointer)();
  87                 }
  88
  89         /* Close databases */
  90         lprintf(7, "Closing databases\n");
  91         close_databases();
  92
  93         /* Do system-dependent stuff */
  94         sysdep_master_cleanup();
  95
  96         /* Now go away. */
  97         lprintf(3, "citserver: exiting.\n");
  98         fflush(stdout); fflush(stderr);
  99         exit(0);
 100         }
 101
 102
 103 /*
 104  * Free any per-session data allocated by modules or whatever
 105  */
 106 void deallocate_user_data(struct CitContext *con)
 107 {
 108         struct CtdlSessData *ptr;
 109
 110         begin_critical_section(S_SESSION_TABLE);
 111         while (con->FirstSessData != NULL) {
 112                 lprintf(9, "Deallocating user data symbol %ld\n",
 113                         con->FirstSessData->sym_id);
 114                 if (con->FirstSessData->sym_data != NULL)
 115                         phree(con->FirstSessData->sym_data);
 116                 ptr = con->FirstSessData->next;
 117                 phree(con->FirstSessData);
 118                 con->FirstSessData = ptr;
 119         }
 120         end_critical_section(S_SESSION_TABLE);
 121 }
 122
 123
 124
 125
 126 /*
 127  * Terminate a session and remove its context data structure.
 128  */
 129 void RemoveContext (struct CitContext *con)
 130 {
 131         struct CitContext *ptr = NULL;
 132         struct CitContext *ToFree = NULL;
 133
 134         lprintf(9, "RemoveContext() called\n");
 135         if (con==NULL) {
 136                 lprintf(5, "WARNING: RemoveContext() called with NULL!\n");
 137                 return;
 138                 }
 139
 140         /* Remove the context from the global context list.  This needs
 141          * to get done FIRST to avoid concurrency problems.  It is *vitally*
 142          * important to keep num_sessions accurate!!
 143          */
 144         lprintf(7, "Removing context for session %d\n", con->cs_pid);
 145         begin_critical_section(S_SESSION_TABLE);
 146         if (ContextList == con) {
 147                 ToFree = ContextList;
 148                 ContextList = ContextList->next;
 149                 --num_sessions;
 150                 }
 151         else {
 152                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 153                         if (ptr->next == con) {
 154                                 ToFree = ptr->next;
 155                                 ptr->next = ptr->next->next;
 156                                 --num_sessions;
 157                                 }
 158                         }
 159                 }
 160         end_critical_section(S_SESSION_TABLE);
 161
 162         if (ToFree == NULL) {
 163                 lprintf(9, "RemoveContext() found nothing to remove\n");
 164                 return;
 165         }
 166
 167         /* Run any cleanup routines registered by loadable modules.
 168          * Note 1: This must occur *before* deallocate_user_data() because the
 169          *         cleanup functions might touch dynamic session data.
 170          * Note 2: We have to "become_session()" because the cleanup functions
 171          *         might make references to "CC" assuming it's the right one.
 172          */
 173         become_session(con);
 174         PerformSessionHooks(EVT_STOP);
 175         become_session(NULL);
 176
 177         /* Now handle all of the administrivia. */
 178         lprintf(7, "Calling logout(%d)\n", con->cs_pid);
 179         logout(con);
 180
 181         rec_log(CL_TERMINATE, con->curr_user);
 182         unlink(con->temp);
 183         lprintf(3, "citserver[%3d]: ended.\n", con->cs_pid);
 184
 185
 186         syslog(LOG_NOTICE,"session %d ended", con->cs_pid);
 187
 188         /* Deallocate any user-data attached to this session */
 189         deallocate_user_data(con);
 190
 191         /* If the client is still connected, blow 'em away. */
 192         lprintf(7, "Closing socket %d\n", con->client_socket);
 193         close(con->client_socket);
 194
 195         /* Tell the housekeeping thread to check to see if this is the time
 196          * to initiate a scheduled shutdown event.
 197          */
 198         enter_housekeeping_cmd("SCHED_SHUTDOWN");
 199
 200         /* Free up the memory used by this context */
 201         phree(con);
 202
 203         lprintf(7, "Done with RemoveContext()\n");
 204 }
 205
 206
 207
 208 /*
 209  * Get a dynamic symbol number for per-session user data.
 210  * This API call should be made only ONCE per symbol per citserver run.
 211  */
 212 int CtdlGetDynamicSymbol()
 213 {
 214         static unsigned int next_symbol = SYM_MAX;
 215         return ++next_symbol;
 216 }
 217
 218
 219
 220 /*
 221  * Return a pointer to some generic per-session user data.
 222  * (This function returns NULL if the requested symbol is not allocated.)
 223  *
 224  * NOTE: we use critical sections for allocating and de-allocating these,
 225  *       but not for locating one.
 226  */
 227 void *CtdlGetUserData(unsigned long requested_sym)
 228 {
 229         struct CtdlSessData *ptr;
 230
 231         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 232                 if (ptr->sym_id == requested_sym)
 233                         return(ptr->sym_data);
 234
 235         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 236                 requested_sym);
 237         return NULL;
 238 }
 239
 240
 241 /*
 242  * Allocate some generic per-session user data.
 243  */
 244 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 245 {
 246         struct CtdlSessData *ptr;
 247
 248         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 249
 250         /* Fail silently if the symbol is already registered. */
 251         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 252                 if (ptr->sym_id == requested_sym) {
 253                         return;
 254                 }
 255         }
 256
 257         /* Grab us some memory!  Dem's good eatin' !!  */
 258         ptr = mallok(sizeof(struct CtdlSessData));
 259         ptr->sym_id = requested_sym;
 260         ptr->sym_data = mallok(num_bytes);
 261         memset(ptr->sym_data, 0, num_bytes);
 262
 263         begin_critical_section(S_SESSION_TABLE);
 264         ptr->next = CC->FirstSessData;
 265         CC->FirstSessData = ptr;
 266         end_critical_section(S_SESSION_TABLE);
 267
 268         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 269 }
 270
 271
 272 /*
 273  * Change the size of a buffer allocated with CtdlAllocUserData()
 274  */
 275 void CtdlReallocUserData(unsigned long requested_sym, size_t num_bytes)
 276 {
 277         struct CtdlSessData *ptr;
 278
 279         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 280                 if (ptr->sym_id == requested_sym) {
 281                         ptr->sym_data = reallok(ptr->sym_data, num_bytes);
 282                         return;
 283                 }
 284         }
 285
 286         lprintf(2, "CtdlReallocUserData() ERROR: symbol %ld not found!\n",
 287                 requested_sym);
 288 }
 289
 290
 291
 292
 293
 294
 295 /*
 296  * cmd_info()  -  tell the client about this server
 297  */
 298 void cmd_info(void) {
 299         cprintf("%d Server info:\n",LISTING_FOLLOWS);
 300         cprintf("%d\n",CC->cs_pid);
 301         cprintf("%s\n",config.c_nodename);
 302         cprintf("%s\n",config.c_humannode);
 303         cprintf("%s\n",config.c_fqdn);
 304         cprintf("%s\n",CITADEL);
 305         cprintf("%d\n",REV_LEVEL);
 306         cprintf("%s\n",config.c_bbs_city);
 307         cprintf("%s\n",config.c_sysadm);
 308         cprintf("%d\n",SERVER_TYPE);
 309         cprintf("%s\n",config.c_moreprompt);
 310         cprintf("1\n"); /* 1 = yes, this system supports floors */
 311         cprintf("1\n"); /* 1 = we support the extended paging options */
 312         cprintf("000\n");
 313         }
 314
 315
 316 /*
 317  * returns an asterisk if there are any express messages waiting,
 318  * space otherwise.
 319  */
 320 char CtdlCheckExpress(void) {
 321         if (CC->FirstExpressMessage == NULL) {
 322                 return(' ');
 323                 }
 324         else {
 325                 return('*');
 326                 }
 327         }
 328
 329 void cmd_time(void)
 330 {
 331    time_t tv;
 332
 333    tv = time(NULL);
 334
 335    cprintf("%d %ld\n", OK, tv);
 336 }
 337
 338 /*
 339  * Check whether two hostnames match.
 340  * "Realname" should be an actual name of a client that is trying to connect;
 341  * "testname" should be the value we are comparing it with. The idea is that we
 342  * want to compare with both the abbreviated and fully-qualified versions of
 343  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 344  */
 345 static int hostnames_match(const char *realname, const char *testname) {
 346         struct hostent *he;
 347         int retval = 0;
 348
 349         if (!strcasecmp(realname, testname))
 350                 return 1;
 351
 352 #ifdef HAVE_NONREENTRANT_NETDB
 353         begin_critical_section(S_NETDB);
 354 #endif
 355
 356         if ((he = gethostbyname(testname)) != NULL)
 357                 if (!strcasecmp(realname, he->h_name))
 358                         retval = 1;
 359
 360 #ifdef HAVE_NONREENTRANT_NETDB
 361         end_critical_section(S_NETDB);
 362 #endif
 363
 364         return retval;
 365         }
 366
 367 /*
 368  * check a hostname against the public_clients file
 369  */
 370 int is_public_client(char *where)
 371 {
 372         char buf[256];
 373         FILE *fp;
 374
 375         lprintf(9, "Checking whether %s is a public client\n", where);
 376
 377         if (hostnames_match(where, "localhost")) return(1);
 378         if (hostnames_match(where, config.c_fqdn)) return(1);
 379
 380         fp = fopen("public_clients","r");
 381         if (fp == NULL) return(0);
 382
 383         while (fgets(buf,256,fp)!=NULL) {
 384                 while (isspace((buf[strlen(buf)-1])))
 385                         buf[strlen(buf)-1] = 0;
 386                 if (hostnames_match(where,buf)) {
 387                         fclose(fp);
 388                         return(1);
 389                         }
 390                 }
 391
 392         fclose(fp);
 393         return(0);
 394         }
 395
 396
 397 /*
 398  * the client is identifying itself to the server
 399  */
 400 void cmd_iden(char *argbuf)
 401 {
 402         int dev_code;
 403         int cli_code;
 404         int rev_level;
 405         char desc[256];
 406         char from_host[256];
 407         struct in_addr addr;
 408         int do_lookup = 0;
 409
 410         if (num_parms(argbuf)<4) {
 411                 cprintf("%d usage error\n",ERROR);
 412                 return;
 413         }
 414
 415         dev_code = extract_int(argbuf,0);
 416         cli_code = extract_int(argbuf,1);
 417         rev_level = extract_int(argbuf,2);
 418         extract(desc,argbuf,3);
 419
 420         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 421         from_host[sizeof from_host - 1] = 0;
 422         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 423
 424         CC->cs_clientdev = dev_code;
 425         CC->cs_clienttyp = cli_code;
 426         CC->cs_clientver = rev_level;
 427         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 428         CC->cs_clientname[31] = 0;
 429
 430         if (strlen(from_host) > 0) {
 431                 if (CC->is_local_socket) do_lookup = 1;
 432                 else if (is_public_client(CC->cs_host)) do_lookup = 1;
 433         }
 434
 435         if (do_lookup) {
 436                 lprintf(9, "Looking up hostname '%s'\n", from_host);
 437                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 438                         locate_host(CC->cs_host, &addr);
 439                 }
 440                 else {
 441                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 442                         CC->cs_host[24] = 0;
 443                 }
 444         }
 445
 446         lprintf(7, "client %d/%d/%01d.%02d (%s)\n",
 447                 dev_code,
 448                 cli_code,
 449                 (rev_level / 100),
 450                 (rev_level % 100),
 451                 desc);
 452
 453         syslog(LOG_NOTICE,"client %d/%d/%01d.%02d (%s)\n",
 454                 dev_code,
 455                 cli_code,
 456                 (rev_level / 100),
 457                 (rev_level % 100),
 458                 desc);
 459         cprintf("%d Ok\n",OK);
 460 }
 461
 462
 463 /*
 464  * display system messages or help
 465  */
 466 void cmd_mesg(char *mname)
 467 {
 468         FILE *mfp;
 469         char targ[256];
 470         char buf[256];
 471         char *dirs[2];
 472
 473         extract(buf,mname,0);
 474
 475
 476         dirs[0]=mallok(64);
 477         dirs[1]=mallok(64);
 478         strcpy(dirs[0],"messages");
 479         strcpy(dirs[1],"help");
 480         mesg_locate(targ,buf,2,dirs);
 481         phree(dirs[0]);
 482         phree(dirs[1]);
 483
 484
 485         if (strlen(targ)==0) {
 486                 cprintf("%d '%s' not found.\n",ERROR,mname);
 487                 return;
 488                 }
 489
 490         mfp = fopen(targ,"r");
 491         if (mfp==NULL) {
 492                 cprintf("%d Cannot open '%s': %s\n",
 493                         ERROR,targ,strerror(errno));
 494                 return;
 495                 }
 496         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 497
 498         while (fgets(buf,255,mfp)!=NULL) {
 499                 buf[strlen(buf)-1] = 0;
 500                 do_help_subst(buf);
 501                 cprintf("%s\n",buf);
 502                 }
 503
 504         fclose(mfp);
 505         cprintf("000\n");
 506         }
 507
 508
 509 /*
 510  * enter system messages or help
 511  */
 512 void cmd_emsg(char *mname)
 513 {
 514         FILE *mfp;
 515         char targ[256];
 516         char buf[256];
 517         char *dirs[2];
 518         int a;
 519
 520         if (CtdlAccessCheck(ac_aide)) return;
 521
 522         extract(buf,mname,0);
 523         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 524                 if (buf[a] == '/') buf[a] = '.';
 525                 }
 526
 527         dirs[0]=mallok(64);
 528         dirs[1]=mallok(64);
 529         strcpy(dirs[0],"messages");
 530         strcpy(dirs[1],"help");
 531         mesg_locate(targ,buf,2,dirs);
 532         phree(dirs[0]);
 533         phree(dirs[1]);
 534
 535         if (strlen(targ)==0) {
 536                 snprintf(targ, sizeof targ, "./help/%s", buf);
 537                 }
 538
 539         mfp = fopen(targ,"w");
 540         if (mfp==NULL) {
 541                 cprintf("%d Cannot open '%s': %s\n",
 542                         ERROR,targ,strerror(errno));
 543                 return;
 544                 }
 545         cprintf("%d %s\n", SEND_LISTING, targ);
 546
 547         while (client_gets(buf), strcmp(buf, "000")) {
 548                 fprintf(mfp, "%s\n", buf);
 549                 }
 550
 551         fclose(mfp);
 552         }
 553
 554
 555 /* Don't show the names of private rooms unless the viewing
 556  * user also knows the rooms.
 557  */
 558 void GenerateRoomDisplay(char *real_room,
 559                         struct CitContext *viewed,
 560                         struct CitContext *viewer) {
 561
 562         strcpy(real_room, viewed->quickroom.QRname);
 563         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 564                 strcpy(real_room, &real_room[11]);
 565         }
 566         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 567                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 568                    & UA_KNOWN) == 0) {
 569                         strcpy(real_room, "<private room>");
 570                 }
 571         }
 572
 573         if (viewed->cs_flags & CS_CHAT) {
 574                 while (strlen(real_room) < 14)
 575                         strcat(real_room, " ");
 576
 577                 strcpy(&real_room[14], "<chat>");
 578         }
 579
 580 }
 581
 582 /*
 583  * Convenience function.
 584  */
 585 int CtdlAccessCheck(int required_level) {
 586
 587         if (CC->internal_pgm) return(0);
 588         if (required_level >= ac_internal) {
 589                 cprintf("%d This is not a user-level command.\n",
 590                         ERROR+HIGHER_ACCESS_REQUIRED);
 591                 return(-1);
 592         }
 593
 594         if (CC->usersupp.axlevel >= 6) return(0);
 595         if (required_level >= ac_aide) {
 596                 cprintf("%d This command requires Aide access.\n",
 597                         ERROR+HIGHER_ACCESS_REQUIRED);
 598                 return(-1);
 599         }
 600
 601         if (is_room_aide()) return(0);
 602         if (required_level >= ac_room_aide) {
 603                 cprintf("%d This command requires Aide or Room Aide access.\n",
 604                         ERROR + HIGHER_ACCESS_REQUIRED);
 605                 return(-1);
 606         }
 607
 608         if (CC->logged_in) return(0);
 609         if (required_level >= ac_logged_in) {
 610                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 611                 return(-1);
 612         }
 613
 614         /* shhh ... succeed quietly */
 615         return(0);
 616 }
 617
 618
 619
 620 /*
 621  * Terminate another running session
 622  */
 623 void cmd_term(char *cmdbuf)
 624 {
 625         int session_num;
 626         struct CitContext *ccptr;
 627         int found_it = 0;
 628
 629         if (CtdlAccessCheck(ac_aide)) return;
 630
 631         session_num = extract_int(cmdbuf, 0);
 632         if (session_num == CC->cs_pid) {
 633                 cprintf("%d You can't kill your own session.\n", ERROR);
 634                 return;
 635                 }
 636
 637         lprintf(9, "Locating session to kill\n");
 638         begin_critical_section(S_SESSION_TABLE);
 639         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 640                 if (session_num == ccptr->cs_pid) {
 641                         ccptr->kill_me = 1;
 642                         found_it = 1;
 643                         }
 644                 }
 645         end_critical_section(S_SESSION_TABLE);
 646
 647         if (found_it) {
 648                 cprintf("%d Session terminated.\n", OK);
 649                 }
 650         else {
 651                 cprintf("%d No such session.\n", ERROR);
 652                 }
 653         }
 654
 655
 656
 657
 658
 659 /*
 660  * get the paginator prompt
 661  */
 662 void cmd_more(void) {
 663         cprintf("%d %s\n",OK,config.c_moreprompt);
 664         }
 665
 666 /*
 667  * echo
 668  */
 669 void cmd_echo(char *etext)
 670 {
 671         cprintf("%d %s\n",OK,etext);
 672         }
 673
 674
 675
 676 /*
 677  * identify as internal program
 678  */
 679 void cmd_ipgm(char *argbuf)
 680 {
 681         int secret;
 682
 683         secret = extract_int(argbuf, 0);
 684         if (secret == config.c_ipgm_secret) {
 685                 CC->internal_pgm = 1;
 686                 strcpy(CC->curr_user, "<internal program>");
 687                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 688                 cprintf("%d Authenticated as an internal program.\n",OK);
 689                 }
 690         else {
 691                 cprintf("%d Authentication failed.\n",ERROR);
 692                 lprintf(3, "Warning: ipgm authentication failed.\n");
 693                 }
 694         }
 695
 696
 697 /*
 698  * Shut down the server
 699  */
 700 void cmd_down(void) {
 701
 702         if (CtdlAccessCheck(ac_aide)) return;
 703
 704         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 705         master_cleanup();
 706         }
 707
 708 /*
 709  * Schedule or cancel a server shutdown
 710  */
 711 void cmd_scdn(char *argbuf)
 712 {
 713         int new_state;
 714
 715         if (CtdlAccessCheck(ac_aide)) return;
 716
 717         new_state = extract_int(argbuf, 0);
 718         if ((new_state == 0) || (new_state == 1)) {
 719                 ScheduledShutdown = new_state;
 720                 }
 721         cprintf("%d %d\n", OK, ScheduledShutdown);
 722         }
 723
 724
 725 /*
 726  * Back-end function for starting a session
 727  */
 728 void begin_session(struct CitContext *con)
 729 {
 730         int len;
 731         struct sockaddr_in sin;
 732
 733         /*
 734          * Initialize some variables specific to our context.
 735          */
 736         con->logged_in = 0;
 737         con->internal_pgm = 0;
 738         con->download_fp = NULL;
 739         con->upload_fp = NULL;
 740         con->FirstExpressMessage = NULL;
 741         time(&con->lastcmd);
 742         time(&con->lastidle);
 743         strcpy(con->lastcmdname, "    ");
 744         strcpy(con->cs_clientname, "(unknown)");
 745         strcpy(con->curr_user, NLI);
 746         strcpy(con->net_node,"");
 747         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 748         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 749         con->cs_host[sizeof con->cs_host - 1] = 0;
 750         len = sizeof sin;
 751         if (!CC->is_local_socket) {
 752                 if (!getpeername(con->client_socket,
 753                    (struct sockaddr *) &sin, &len))
 754                         locate_host(con->cs_host, &sin.sin_addr);
 755         }
 756         else {
 757                 strcpy(con->cs_host, "");
 758         }
 759         con->cs_flags = 0;
 760         con->upload_type = UPL_FILE;
 761         con->dl_is_net = 0;
 762         con->FirstSessData = NULL;
 763
 764         con->nologin = 0;
 765         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 766                 con->nologin = 1;
 767
 768         lprintf(3, "citserver[%3d]: started.\n", con->cs_pid);
 769
 770         /* Run any session startup routines registered by loadable modules */
 771         PerformSessionHooks(EVT_START);
 772
 773         rec_log(CL_CONNECT, "");
 774 }
 775
 776
 777 void citproto_begin_session() {
 778         if (CC->nologin==1) {
 779                 cprintf("%d %s: Too many users are already online "
 780                         "(maximum is %d)\n",
 781                         ERROR+MAX_SESSIONS_EXCEEDED,
 782                         config.c_nodename, config.c_maxsessions);
 783                 }
 784         else {
 785                 cprintf("%d %s Citadel/UX server ready.\n",
 786                         OK, config.c_nodename);
 787                 }
 788 }
 789
 790
 791
 792
 793 /*
 794  * This loop recognizes all server commands.
 795  */
 796 void do_command_loop(void) {
 797         char cmdbuf[256];
 798
 799         time(&CC->lastcmd);
 800         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 801         if (client_gets(cmdbuf) < 1) {
 802                 lprintf(3, "Client socket is broken.  Ending session.\n");
 803                 CC->kill_me = 1;
 804                 return;
 805         }
 806         lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 807
 808         /*
 809          * Let other clients see the last command we executed, and
 810          * update the idle time, but not NOOP, PEXP, or GEXP.
 811          */
 812         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 813            && (strncasecmp(cmdbuf, "PEXP", 4))
 814            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 815                 strcpy(CC->lastcmdname, "    ");
 816                 safestrncpy(CC->lastcmdname, cmdbuf,
 817                         sizeof(CC->lastcmdname) );
 818                 time(&CC->lastidle);
 819                 }
 820
 821         if ((strncasecmp(cmdbuf, "ENT0", 4))
 822            && (strncasecmp(cmdbuf, "MESG", 4))
 823            && (strncasecmp(cmdbuf, "MSGS", 4)))
 824         {
 825            CC->cs_flags &= ~CS_POSTING;
 826         }
 827
 828         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 829                 cprintf("%d%cok\n",OK,CtdlCheckExpress());
 830                 }
 831
 832         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 833                 cprintf("%d Goodbye.\n",OK);
 834                 CC->kill_me = 1;
 835                 }
 836
 837         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 838                 if (CC->logged_in) logout(CC);
 839                 cprintf("%d logged out.\n",OK);
 840                 }
 841
 842         else if (!strncasecmp(cmdbuf,"USER",4)) {
 843                 cmd_user(&cmdbuf[5]);
 844                 }
 845
 846         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 847                 cmd_pass(&cmdbuf[5]);
 848                 }
 849
 850         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 851                 cmd_newu(&cmdbuf[5]);
 852                 }
 853
 854         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 855                 cmd_setp(&cmdbuf[5]);
 856                 }
 857
 858         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 859                 cmd_lrms(&cmdbuf[5]);
 860                 }
 861
 862         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 863                 cmd_lkra(&cmdbuf[5]);
 864                 }
 865
 866         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 867                 cmd_lkrn(&cmdbuf[5]);
 868                 }
 869
 870         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 871                 cmd_lkro(&cmdbuf[5]);
 872                 }
 873
 874         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 875                 cmd_lzrm(&cmdbuf[5]);
 876                 }
 877
 878         else if (!strncasecmp(cmdbuf,"GETU",4)) {
 879                 cmd_getu();
 880                 }
 881
 882         else if (!strncasecmp(cmdbuf,"SETU",4)) {
 883                 cmd_setu(&cmdbuf[5]);
 884                 }
 885
 886         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 887                 cmd_goto(&cmdbuf[5]);
 888                 }
 889
 890         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 891                 cmd_msgs(&cmdbuf[5]);
 892                 }
 893
 894         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
 895                 cmd_whok();
 896                 }
 897
 898         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
 899                 cmd_rdir();
 900                 }
 901
 902         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
 903                 cmd_msg0(&cmdbuf[5]);
 904                 }
 905
 906         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
 907                 cmd_msg2(&cmdbuf[5]);
 908                 }
 909
 910         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
 911                 cmd_msg3(&cmdbuf[5]);
 912                 }
 913
 914         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
 915                 cmd_msg4(&cmdbuf[5]);
 916                 }
 917
 918         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
 919                 cmd_opna(&cmdbuf[5]);
 920                 }
 921
 922         else if (!strncasecmp(cmdbuf,"INFO",4)) {
 923                 cmd_info();
 924                 }
 925
 926         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
 927                 cmd_slrp(&cmdbuf[5]);
 928                 }
 929
 930         else if (!strncasecmp(cmdbuf,"INVT",4)) {
 931                 cmd_invt_kick(&cmdbuf[5],1);
 932                 }
 933
 934         else if (!strncasecmp(cmdbuf,"KICK",4)) {
 935                 cmd_invt_kick(&cmdbuf[5],0);
 936                 }
 937
 938         else if (!strncasecmp(cmdbuf,"GETR",4)) {
 939                 cmd_getr();
 940                 }
 941
 942         else if (!strncasecmp(cmdbuf,"SETR",4)) {
 943                 cmd_setr(&cmdbuf[5]);
 944                 }
 945
 946         else if (!strncasecmp(cmdbuf,"GETA",4)) {
 947                 cmd_geta();
 948                 }
 949
 950         else if (!strncasecmp(cmdbuf,"SETA",4)) {
 951                 cmd_seta(&cmdbuf[5]);
 952                 }
 953
 954         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
 955                 cmd_ent0(&cmdbuf[5]);
 956                 }
 957
 958         else if (!strncasecmp(cmdbuf,"ENT3",4)) {
 959                 cmd_ent3(&cmdbuf[5]);
 960                 }
 961
 962         else if (!strncasecmp(cmdbuf,"RINF",4)) {
 963                 cmd_rinf();
 964                 }
 965
 966         else if (!strncasecmp(cmdbuf,"DELE",4)) {
 967                 cmd_dele(&cmdbuf[5]);
 968                 }
 969
 970         else if (!strncasecmp(cmdbuf,"KILL",4)) {
 971                 cmd_kill(&cmdbuf[5]);
 972                 }
 973
 974         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
 975                 cmd_cre8(&cmdbuf[5]);
 976                 }
 977
 978         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
 979                 cmd_move(&cmdbuf[5]);
 980                 }
 981
 982         else if (!strncasecmp(cmdbuf,"FORG",4)) {
 983                 cmd_forg();
 984                 }
 985
 986         else if (!strncasecmp(cmdbuf,"MESG",4)) {
 987                 cmd_mesg(&cmdbuf[5]);
 988                 }
 989
 990         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
 991                 cmd_emsg(&cmdbuf[5]);
 992                 }
 993
 994         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
 995                 cmd_gnur();
 996                 }
 997
 998         else if (!strncasecmp(cmdbuf,"VALI",4)) {
 999                 cmd_vali(&cmdbuf[5]);
1000                 }
1001
1002         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1003                 cmd_einf(&cmdbuf[5]);
1004                 }
1005
1006         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1007                 cmd_list();
1008                 }
1009
1010         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1011                 cmd_chek();
1012                 }
1013
1014         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1015                 cmd_delf(&cmdbuf[5]);
1016                 }
1017
1018         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1019                 cmd_movf(&cmdbuf[5]);
1020                 }
1021
1022         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1023                 cmd_netf(&cmdbuf[5]);
1024                 }
1025
1026         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1027                 cmd_open(&cmdbuf[5]);
1028                 }
1029
1030         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1031                 cmd_clos();
1032                 }
1033
1034         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1035                 cmd_uopn(&cmdbuf[5]);
1036                 }
1037
1038         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1039                 cmd_ucls(&cmdbuf[5]);
1040                 }
1041
1042         else if (!strncasecmp(cmdbuf,"READ",4)) {
1043                 cmd_read(&cmdbuf[5]);
1044                 }
1045
1046         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1047                 cmd_writ(&cmdbuf[5]);
1048                 }
1049
1050         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1051                 cmd_qusr(&cmdbuf[5]);
1052                 }
1053
1054         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1055                 cmd_echo(&cmdbuf[5]);
1056                 }
1057
1058         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1059                 cmd_oimg(&cmdbuf[5]);
1060                 }
1061
1062         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1063                 cmd_more();
1064                 }
1065
1066         else if (!strncasecmp(cmdbuf,"NETP",4)) {
1067                 cmd_netp(&cmdbuf[5]);
1068                 }
1069
1070         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1071                 cmd_ndop(&cmdbuf[5]);
1072                 }
1073
1074         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1075                 cmd_nuop(&cmdbuf[5]);
1076                 }
1077
1078         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1079                 cmd_lflr();
1080                 }
1081
1082         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1083                 cmd_cflr(&cmdbuf[5]);
1084                 }
1085
1086         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1087                 cmd_kflr(&cmdbuf[5]);
1088                 }
1089
1090         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1091                 cmd_eflr(&cmdbuf[5]);
1092                 }
1093
1094         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1095                 cmd_iden(&cmdbuf[5]);
1096                 }
1097
1098         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1099                 cmd_ipgm(&cmdbuf[5]);
1100                 }
1101
1102         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1103                 cmd_term(&cmdbuf[5]);
1104                 }
1105
1106         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1107                 cmd_down();
1108                 }
1109
1110         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1111                 cmd_scdn(&cmdbuf[5]);
1112                 }
1113
1114         else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1115                 cmd_nset(&cmdbuf[5]);
1116                 }
1117
1118         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1119                 cmd_uimg(&cmdbuf[5]);
1120                 }
1121
1122         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1123                 cmd_time();
1124                 }
1125
1126         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1127                 cmd_agup(&cmdbuf[5]);
1128                 }
1129
1130         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1131                 cmd_asup(&cmdbuf[5]);
1132                 }
1133
1134         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1135                 cmd_gpex(&cmdbuf[5]);
1136                 }
1137
1138         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1139                 cmd_spex(&cmdbuf[5]);
1140                 }
1141
1142         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1143                 cmd_conf(&cmdbuf[5]);
1144                 }
1145
1146 #ifdef DEBUG_MEMORY_LEAKS
1147         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1148                 dump_tracked();
1149                 }
1150 #endif
1151
1152         else if (!DLoader_Exec_Cmd(cmdbuf))
1153                 {
1154                    cprintf("%d Unrecognized or unsupported command.\n",
1155                             ERROR);
1156                 }
1157
1158         /* Run any after-each-command outines registered by modules */
1159         PerformSessionHooks(EVT_CMD);
1160 }