citadel/citserver.c

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