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 #ifdef HAVE_PTHREAD_H
  14 #include <pthread.h>
  15 #endif
  16 #include <syslog.h>
  17 #include <dlfcn.h>
  18 #include <netdb.h>
  19 #include <sys/socket.h>
  20 #include <netinet/in.h>
  21 #include <arpa/inet.h>
  22 #include "citadel.h"
  23 #include "server.h"
  24 #include "sysdep_decls.h"
  25 #include "citserver.h"
  26 #include "config.h"
  27 #include "database.h"
  28 #include "housekeeping.h"
  29 #include "user_ops.h"
  30 #include "logging.h"
  31 #include "support.h"
  32 #include "msgbase.h"
  33 #include "locate_host.h"
  34 #include "room_ops.h"
  35 #include "file_ops.h"
  36 #include "dynloader.h"
  37 #include "policy.h"
  38 #include "control.h"
  39 #include "tools.h"
  40
  41 struct CitContext *ContextList = NULL;
  42 int ScheduledShutdown = 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         lprintf(7, "Checking floor reference counts\n");
  52         check_ref_counts();
  53
  54         lprintf(7, "Creating base rooms (if necessary)\n");
  55         create_room(BASEROOM, 0, "", 0);
  56         create_room(AIDEROOM, 4, "", 0);
  57         create_room(config.c_twitroom, 0, "", 0);
  58         }
  59
  60 /*
  61  * Cleanup routine to be called when the server is shutting down.
  62  */
  63 void master_cleanup(void) {
  64         struct CleanupFunctionHook *fcn;
  65
  66         /* Cancel all running sessions */
  67         lprintf(7, "Cancelling running sessions...\n");
  68         while (ContextList != NULL) {
  69                 kill_session(ContextList->cs_pid);
  70                 }
  71
  72         /* Run any cleanup routines registered by loadable modules */
  73         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
  74                 (*fcn->h_function_pointer)();
  75                 }
  76
  77         /* Close databases */
  78         lprintf(7, "Closing databases\n");
  79         close_databases();
  80
  81         /* Do system-dependent stuff */
  82         sysdep_master_cleanup();
  83
  84         /* Now go away. */
  85         lprintf(3, "citserver: exiting.\n");
  86         fflush(stdout); fflush(stderr);
  87         exit(0);
  88         }
  89
  90
  91 /*
  92  * Gracefully terminate the session and thread.
  93  * (This is called as a cleanup handler by the thread library.)
  94  *
  95  * All NON-system-dependent stuff is done in this function.
  96  * System-dependent session/thread cleanup is in cleanup() in sysdep.c
  97  */
  98 void cleanup_stuff(void *arg)
  99 {
 100
 101         lprintf(9, "cleanup_stuff() called\n");
 102
 103         lprintf(7, "Calling logout(%d)\n", CC->cs_pid);
 104         logout(CC);
 105
 106         rec_log(CL_TERMINATE,CC->curr_user);
 107         unlink(CC->temp);
 108         lprintf(3, "citserver[%3d]: ended.\n",CC->cs_pid);
 109
 110         /* Run any cleanup routines registered by loadable modules */
 111         PerformSessionHooks(EVT_STOP);
 112
 113         syslog(LOG_NOTICE,"session %d ended", CC->cs_pid);
 114
 115         /* Deallocate any message list we might have in memory */
 116         if (CC->msglist != NULL) phree(CC->msglist);
 117
 118         /* Now get rid of the session and context */
 119         lprintf(7, "cleanup_stuff() calling RemoveContext(%d)\n", CC->cs_pid);
 120         RemoveContext(CC);
 121
 122         /* While we still have an extra thread with no user attached to it,
 123          * take the opportunity to do some housekeeping before exiting.
 124          */
 125         do_housekeeping();
 126         }
 127
 128
 129 /*
 130  * set_wtmpsupp()  -  alter the session listing
 131  */
 132 void set_wtmpsupp(char *newtext)
 133 {
 134         strncpy(CC->cs_room,newtext,sizeof CC->cs_room);
 135         CC->cs_room[sizeof CC->cs_room - 1] = 0;
 136         time(&CC->cs_lastupdt);
 137
 138         /* Run any routines registered by loadable modules */
 139         PerformSessionHooks(EVT_NEWROOM);
 140         }
 141
 142
 143 /*
 144  * call set_wtmpsupp() with the name of the current room, modified a bit...
 145  */
 146 void set_wtmpsupp_to_current_room() {
 147         if (CC->quickroom.QRflags & QR_PRIVATE) {
 148                 set_wtmpsupp("<private room>");
 149                 }
 150         else if (CC->quickroom.QRflags & QR_MAILBOX) {
 151                 set_wtmpsupp(&CC->quickroom.QRname[11]);
 152                 }
 153         else {
 154                 set_wtmpsupp(CC->quickroom.QRname);
 155                 }
 156         }
 157
 158
 159
 160 /*
 161  * cmd_info()  -  tell the client about this server
 162  */
 163 void cmd_info(void) {
 164         cprintf("%d Server info:\n",LISTING_FOLLOWS);
 165         cprintf("%d\n",CC->cs_pid);
 166         cprintf("%s\n",config.c_nodename);
 167         cprintf("%s\n",config.c_humannode);
 168         cprintf("%s\n",config.c_fqdn);
 169         cprintf("%s\n",CITADEL);
 170         cprintf("%d\n",REV_LEVEL);
 171         cprintf("%s\n",config.c_bbs_city);
 172         cprintf("%s\n",config.c_sysadm);
 173         cprintf("%d\n",SERVER_TYPE);
 174         cprintf("%s\n",config.c_moreprompt);
 175         cprintf("1\n"); /* 1 = yes, this system supports floors */
 176         cprintf("1\n"); /* 1 = we support the extended paging options */
 177         cprintf("000\n");
 178         }
 179
 180 void cmd_rchg(char *argbuf)
 181 {
 182         char newroomname[256]; /* set to 256 to prevent buffer overruns <dme>*/
 183
 184         extract(newroomname, argbuf, 0);
 185         newroomname[ROOMNAMELEN] = 0;
 186         if (strlen(newroomname) > 0) {
 187                 strncpy(CC->fake_roomname, newroomname, ROOMNAMELEN);
 188                 CC->fake_roomname[ROOMNAMELEN - 1] = 0;
 189                 }
 190         else {
 191                 strcpy(CC->fake_roomname, "");
 192                 }
 193         cprintf("%d OK\n", OK);
 194 }
 195
 196 void cmd_hchg(char *newhostname)
 197 {
 198    if ((newhostname) && (newhostname[0]))
 199    {
 200       memset(CC->fake_hostname, 0, 25);
 201       strncpy(CC->fake_hostname, newhostname, 24);
 202    }
 203    else
 204       strcpy(CC->fake_hostname, "");
 205    cprintf("%d OK\n",OK);
 206 }
 207
 208 void cmd_uchg(char *newusername)
 209 {
 210    if (CC->usersupp.axlevel < 6)
 211    {
 212       cprintf("%d You must be an Aide to use UCHG.\n",
 213                 ERROR+HIGHER_ACCESS_REQUIRED);
 214       return;
 215    }
 216    if ((newusername) && (newusername[0]))
 217    {
 218       CC->cs_flags &= ~CS_STEALTH;
 219       memset(CC->fake_username, 0, 32);
 220       if (strncasecmp(newusername, CC->curr_user, strlen(CC->curr_user)))
 221          strncpy(CC->fake_username, newusername, 31);
 222    }
 223    else
 224    {
 225       CC->fake_username[0] = '\0';
 226       CC->cs_flags |= CS_STEALTH;
 227    }
 228    cprintf("%d\n",OK);
 229 }
 230
 231 /*
 232  * returns an asterisk if there are any express messages waiting,
 233  * space otherwise.
 234  */
 235 char check_express(void) {
 236         if (CC->FirstExpressMessage == NULL) {
 237                 return(' ');
 238                 }
 239         else {
 240                 return('*');
 241                 }
 242         }
 243
 244 void cmd_time(void)
 245 {
 246    time_t tv;
 247
 248    tv = time(NULL);
 249
 250    cprintf("%d %ld\n", OK, tv);
 251 }
 252
 253 /*
 254  * Check whether two hostnames match.
 255  * "Realname" should be an actual name of a client that is trying to connect;
 256  * "testname" should be the value we are comparing it with. The idea is that we
 257  * want to compare with both the abbreviated and fully-qualified versions of
 258  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 259  */
 260 static int hostnames_match(const char *realname, const char *testname) {
 261         struct hostent *he;
 262         int retval = 0;
 263
 264         if (!strcasecmp(realname, testname))
 265                 return 1;
 266
 267 #ifdef HAVE_NONREENTRANT_NETDB
 268         begin_critical_section(S_NETDB);
 269 #endif
 270
 271         if ((he = gethostbyname(testname)) != NULL)
 272                 if (!strcasecmp(realname, he->h_name))
 273                         retval = 1;
 274
 275 #ifdef HAVE_NONREENTRANT_NETDB
 276         end_critical_section(S_NETDB);
 277 #endif
 278
 279         return retval;
 280         }
 281
 282 /*
 283  * check a hostname against the public_clients file
 284  */
 285 int is_public_client(char *where)
 286 {
 287         char buf[256];
 288         FILE *fp;
 289
 290         if (hostnames_match(where,"localhost")) return(1);
 291         if (hostnames_match(where,config.c_fqdn)) return(1);
 292
 293         fp = fopen("public_clients","r");
 294         if (fp == NULL) return(0);
 295
 296         while (fgets(buf,256,fp)!=NULL) {
 297                 while (isspace((buf[strlen(buf)-1])))
 298                         buf[strlen(buf)-1] = 0;
 299                 if (hostnames_match(where,buf)) {
 300                         fclose(fp);
 301                         return(1);
 302                         }
 303                 }
 304
 305         fclose(fp);
 306         return(0);
 307         }
 308
 309
 310 /*
 311  * the client is identifying itself to the server
 312  */
 313 void cmd_iden(char *argbuf)
 314 {
 315         int dev_code;
 316         int cli_code;
 317         int rev_level;
 318         char desc[256];
 319         char from_host[256];
 320         struct in_addr addr;
 321
 322         if (num_parms(argbuf)<4) {
 323                 cprintf("%d usage error\n",ERROR);
 324                 return;
 325                 }
 326
 327         dev_code = extract_int(argbuf,0);
 328         cli_code = extract_int(argbuf,1);
 329         rev_level = extract_int(argbuf,2);
 330         extract(desc,argbuf,3);
 331
 332         strncpy(from_host,config.c_fqdn,sizeof from_host);
 333         from_host[sizeof from_host - 1] = 0;
 334         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 335
 336         CC->cs_clientdev = dev_code;
 337         CC->cs_clienttyp = cli_code;
 338         CC->cs_clientver = rev_level;
 339         strncpy(CC->cs_clientname,desc,31);
 340         CC->cs_clientname[31] = 0;
 341
 342         if ((strlen(from_host)>0) &&
 343            (is_public_client(CC->cs_host))) {
 344                 if (inet_aton(from_host, &addr))
 345                         locate_host(CC->cs_host, &addr);
 346                 else {
 347                         strncpy(CC->cs_host,from_host,24);
 348                         CC->cs_host[24] = 0;
 349                         }
 350                 }
 351         set_wtmpsupp_to_current_room();
 352
 353         syslog(LOG_NOTICE,"client %d/%d/%01d.%02d (%s)\n",
 354                 dev_code,
 355                 cli_code,
 356                 (rev_level / 100),
 357                 (rev_level % 100),
 358                 desc);
 359                 cprintf("%d Ok\n",OK);
 360         }
 361
 362
 363 /*
 364  * enter or exit "stealth mode"
 365  */
 366 void cmd_stel(char *cmdbuf)
 367 {
 368         int requested_mode;
 369
 370         requested_mode = extract_int(cmdbuf,0);
 371         if (requested_mode !=0) requested_mode = 1;
 372
 373         if (!CC->logged_in) {
 374                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 375                 return;
 376                 }
 377
 378         if (CC->usersupp.axlevel < 6) {
 379                 cprintf("%d You must be an Aide to use stealth mode.\n",
 380                         ERROR+HIGHER_ACCESS_REQUIRED);
 381                 return;
 382                 }
 383
 384         if (CC->cs_flags & CS_STEALTH) {
 385                 if (requested_mode == 0)
 386                         CC->cs_flags = CC->cs_flags-CS_STEALTH;
 387                 }
 388         else {
 389                 if (requested_mode == 1)
 390                         CC->cs_flags = CC->cs_flags|CS_STEALTH;
 391                 }
 392
 393         set_wtmpsupp_to_current_room();
 394         cprintf("%d Ok\n",OK);
 395         }
 396
 397
 398
 399
 400 /*
 401  * display system messages or help
 402  */
 403 void cmd_mesg(char *mname)
 404 {
 405         FILE *mfp;
 406         char targ[256];
 407         char buf[256];
 408         char *dirs[2];
 409
 410         extract(buf,mname,0);
 411
 412
 413         dirs[0]=mallok(64);
 414         dirs[1]=mallok(64);
 415         strcpy(dirs[0],"messages");
 416         strcpy(dirs[1],"help");
 417         mesg_locate(targ,buf,2,dirs);
 418         phree(dirs[0]);
 419         phree(dirs[1]);
 420
 421
 422         if (strlen(targ)==0) {
 423                 cprintf("%d '%s' not found.\n",ERROR,mname);
 424                 return;
 425                 }
 426
 427         mfp = fopen(targ,"r");
 428         if (mfp==NULL) {
 429                 cprintf("%d Cannot open '%s': %s\n",
 430                         ERROR,targ,strerror(errno));
 431                 return;
 432                 }
 433         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 434
 435         while (fgets(buf,255,mfp)!=NULL) {
 436                 buf[strlen(buf)-1] = 0;
 437                 do_help_subst(buf);
 438                 cprintf("%s\n",buf);
 439                 }
 440
 441         fclose(mfp);
 442         cprintf("000\n");
 443         }
 444
 445
 446 /*
 447  * enter system messages or help
 448  */
 449 void cmd_emsg(char *mname)
 450 {
 451         FILE *mfp;
 452         char targ[256];
 453         char buf[256];
 454         char *dirs[2];
 455         int a;
 456
 457         if (CC->usersupp.axlevel < 6) {
 458                 cprintf("%d You must be an Aide to edit system messages.\n",
 459                         ERROR+HIGHER_ACCESS_REQUIRED);
 460                 return;
 461                 }
 462
 463         extract(buf,mname,0);
 464         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 465                 if (buf[a] == '/') buf[a] = '.';
 466                 }
 467
 468         dirs[0]=mallok(64);
 469         dirs[1]=mallok(64);
 470         strcpy(dirs[0],"messages");
 471         strcpy(dirs[1],"help");
 472         mesg_locate(targ,buf,2,dirs);
 473         phree(dirs[0]);
 474         phree(dirs[1]);
 475
 476         if (strlen(targ)==0) {
 477                 snprintf(targ, sizeof targ, "./help/%s", buf);
 478                 }
 479
 480         mfp = fopen(targ,"w");
 481         if (mfp==NULL) {
 482                 cprintf("%d Cannot open '%s': %s\n",
 483                         ERROR,targ,strerror(errno));
 484                 return;
 485                 }
 486         cprintf("%d %s\n", SEND_LISTING, targ);
 487
 488         while (client_gets(buf), strcmp(buf, "000")) {
 489                 fprintf(mfp, "%s\n", buf);
 490                 }
 491
 492         fclose(mfp);
 493         }
 494
 495
 496 /*
 497  * who's online
 498  */
 499 void cmd_rwho(void) {
 500         struct CitContext *cptr;
 501         int spoofed = 0;
 502         int aide;
 503         char un[40], room[40], host[40], flags[5];
 504
 505         aide = CC->usersupp.axlevel >= 6;
 506         cprintf("%d\n",LISTING_FOLLOWS);
 507
 508         for (cptr = ContextList; cptr != NULL; cptr = cptr->next)
 509         {
 510                 flags[0] = '\0';
 511                 spoofed = 0;
 512
 513                 if (cptr->cs_flags & CS_POSTING)
 514                    strcat(flags, "*");
 515                 else
 516                    strcat(flags, ".");
 517
 518                 if (cptr->fake_username[0])
 519                 {
 520                    strcpy(un, cptr->fake_username);
 521                    spoofed = 1;
 522                 }
 523                 else
 524                    strcpy(un, cptr->curr_user);
 525
 526                 if (cptr->fake_hostname[0])
 527                 {
 528                    strcpy(host, cptr->fake_hostname);
 529                    spoofed = 1;
 530                 }
 531                 else
 532                    strcpy(host, cptr->cs_host);
 533
 534                 if (cptr->fake_roomname[0])
 535                 {
 536                    strcpy(room, cptr->fake_roomname);
 537                    spoofed = 1;
 538                 }
 539                 else
 540                    strcpy(room, cptr->cs_room);
 541
 542
 543                 if ((aide) && (spoofed))
 544                    strcat(flags, "+");
 545
 546                 if ((cptr->cs_flags & CS_STEALTH) && (aide))
 547                    strcat(flags, "-");
 548
 549                 if (((cptr->cs_flags&CS_STEALTH)==0) || (aide))
 550                 {
 551                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 552                                 cptr->cs_pid, un, room,
 553                                 host, cptr->cs_clientname,
 554                                 (long)(cptr->lastidle),
 555                                 cptr->lastcmdname, flags);
 556                 }
 557                 if ((spoofed) && (aide))
 558                 {
 559                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 560                                 cptr->cs_pid, cptr->curr_user, cptr->cs_room,
 561                                 cptr->cs_host, cptr->cs_clientname,
 562                                 (long)(cptr->lastidle),
 563                                 cptr->lastcmdname, flags);
 564
 565                 }
 566         }
 567         cprintf("000\n");
 568         }
 569
 570
 571 /*
 572  * Terminate another running session
 573  */
 574 void cmd_term(char *cmdbuf)
 575 {
 576         int session_num;
 577         struct CitContext *ccptr;
 578         int session_to_kill = 0;
 579
 580         if (!CC->logged_in) {
 581                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 582                 return;
 583                 }
 584
 585         if (CC->usersupp.axlevel < 6) {
 586                 cprintf("%d You must be an Aide to terminate sessions.\n",
 587                         ERROR+HIGHER_ACCESS_REQUIRED);
 588                 return;
 589                 }
 590
 591         session_num = extract_int(cmdbuf, 0);
 592         if (session_num == CC->cs_pid) {
 593                 cprintf("%d You can't kill your own session.\n", ERROR);
 594                 return;
 595                 }
 596
 597         lprintf(9, "Locating session to kill\n");
 598         begin_critical_section(S_SESSION_TABLE);
 599         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 600                 if (session_num == ccptr->cs_pid) {
 601                         session_to_kill = ccptr->cs_pid;
 602                         }
 603                 }
 604         end_critical_section(S_SESSION_TABLE);
 605         lprintf(9, "session_to_kill == %d\n", session_to_kill);
 606
 607         if (session_to_kill > 0) {
 608                 lprintf(9, "calling kill_session()\n");
 609                 kill_session(session_to_kill);
 610                 cprintf("%d Session terminated.\n", OK);
 611                 }
 612         else {
 613                 cprintf("%d No such session.\n", ERROR);
 614                 }
 615         }
 616
 617
 618
 619
 620
 621 /*
 622  * get the paginator prompt
 623  */
 624 void cmd_more(void) {
 625         cprintf("%d %s\n",OK,config.c_moreprompt);
 626         }
 627
 628 /*
 629  * echo
 630  */
 631 void cmd_echo(char *etext)
 632 {
 633         cprintf("%d %s\n",OK,etext);
 634         }
 635
 636
 637
 638 /*
 639  * identify as internal program
 640  */
 641 void cmd_ipgm(char *argbuf)
 642 {
 643         int secret;
 644
 645         secret = extract_int(argbuf, 0);
 646         if (secret == config.c_ipgm_secret) {
 647                 CC->internal_pgm = 1;
 648                 strcpy(CC->curr_user, "<internal program>");
 649                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 650                 cprintf("%d Authenticated as an internal program.\n",OK);
 651                 }
 652         else {
 653                 cprintf("%d Authentication failed.\n",ERROR);
 654                 }
 655         }
 656
 657
 658 /*
 659  * Shut down the server
 660  */
 661 void cmd_down(void) {
 662         if (!CC->logged_in) {
 663                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 664                 return;
 665                 }
 666
 667         if (CC->usersupp.axlevel < 6) {
 668                 cprintf("%d You must be an Aide to shut down the server.\n",
 669                         ERROR+HIGHER_ACCESS_REQUIRED);
 670                 return;
 671                 }
 672
 673         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 674         master_cleanup();
 675         }
 676
 677 /*
 678  * Schedule or cancel a server shutdown
 679  */
 680 void cmd_scdn(char *argbuf)
 681 {
 682         int new_state;
 683
 684         if (!CC->logged_in) {
 685                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 686                 return;
 687                 }
 688
 689         if (CC->usersupp.axlevel < 6) {
 690                 cprintf("%d You must be an Aide to schedule a shutdown.\n",
 691                         ERROR+HIGHER_ACCESS_REQUIRED);
 692                 return;
 693                 }
 694
 695         new_state = extract_int(argbuf, 0);
 696         if ((new_state == 0) || (new_state == 1)) {
 697                 ScheduledShutdown = new_state;
 698                 }
 699         cprintf("%d %d\n", OK, ScheduledShutdown);
 700         }
 701
 702
 703 /*
 704  * main context loop
 705  */
 706 void *context_loop(struct CitContext *con)
 707 {
 708         char cmdbuf[256];
 709         int num_sessions, len;
 710         struct sockaddr_in sin;
 711
 712         /*
 713          * Wedge our way into the context table.
 714          */
 715         InitMyContext(con);
 716
 717         /*
 718          * Initialize some variables specific to our context.
 719          */
 720         CC->logged_in = 0;
 721         CC->internal_pgm = 0;
 722         CC->download_fp = NULL;
 723         CC->upload_fp = NULL;
 724         CC->cs_pid = con->client_socket;        /* not necessarily portable */
 725         CC->FirstExpressMessage = NULL;
 726         CC->msglist = NULL;
 727         CC->num_msgs = 0;
 728         time(&CC->lastcmd);
 729         time(&CC->lastidle);
 730         strcpy(CC->lastcmdname, "    ");
 731         strcpy(CC->cs_clientname, "(unknown)");
 732         strcpy(CC->curr_user,"(not logged in)");
 733         strcpy(CC->net_node,"");
 734         snprintf(CC->temp, sizeof CC->temp, "/tmp/CitServer.%d.%d", getpid(), CC->cs_pid);
 735         strcpy(CC->cs_room, "(no room)");
 736         strncpy(CC->cs_host, config.c_fqdn, sizeof CC->cs_host);
 737         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 738         len = sizeof sin;
 739         if (!getpeername(CC->client_socket, (struct sockaddr *) &sin, &len))
 740                 locate_host(CC->cs_host, &sin.sin_addr);
 741         CC->cs_flags = 0;
 742         CC->upload_type = UPL_FILE;
 743         CC->dl_is_net = 0;
 744
 745         num_sessions = session_count();
 746         CC->nologin = 0;
 747         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 748                 CC->nologin = 1;
 749
 750         if (CC->nologin==1) {
 751            cprintf("%d %s: Too many users are already online (maximum is %d)\n",
 752                 ERROR+MAX_SESSIONS_EXCEEDED,
 753                 config.c_nodename,config.c_maxsessions);
 754                 }
 755         else {
 756            cprintf("%d %s Citadel/UX server ready.\n",OK,config.c_nodename);
 757                 }
 758
 759         lprintf(3, "citserver[%3d]: started.\n", CC->cs_pid);
 760
 761         /* Run any session startup routines registered by loadable modules */
 762         PerformSessionHooks(EVT_START);
 763
 764         rec_log(CL_CONNECT, "");
 765
 766         do {
 767                 time(&CC->lastcmd);
 768                 memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 769                 if (client_gets(cmdbuf) < 1) cleanup(EXIT_NULL);
 770                 lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 771
 772                 /*
 773                  * Let other clients see the last command we executed, but
 774                  * exclude NOOP because that would be boring.
 775                  */
 776                 if (strncasecmp(cmdbuf, "NOOP", 4)) {
 777                         strcpy(CC->lastcmdname, "    ");
 778                         strncpy(CC->lastcmdname, cmdbuf, 4);
 779                         time(&CC->lastidle);
 780                         }
 781
 782                 if ((strncasecmp(cmdbuf, "ENT0", 4)) && (strncasecmp(cmdbuf, "MESG", 4)) && (strncasecmp(cmdbuf, "MSGS", 4)))
 783                 {
 784                    CC->cs_flags &= ~CS_POSTING;
 785                 }
 786
 787 /*
 788  * This loop recognizes all server commands.
 789  */
 790
 791                 if (!strncasecmp(cmdbuf,"NOOP",4)) {
 792                         cprintf("%d%cok\n",OK,check_express());
 793                         }
 794
 795                 else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 796                         cprintf("%d Goodbye.\n",OK);
 797                         }
 798
 799                 else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 800                         if (CC->logged_in) logout(CC);
 801                         cprintf("%d logged out.\n",OK);
 802                         }
 803
 804                 else if (!strncasecmp(cmdbuf,"USER",4)) {
 805                         cmd_user(&cmdbuf[5]);
 806                         }
 807
 808                 else if (!strncasecmp(cmdbuf,"PASS",4)) {
 809                         cmd_pass(&cmdbuf[5]);
 810                         }
 811
 812                 else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 813                         cmd_newu(&cmdbuf[5]);
 814                         }
 815
 816                 else if (!strncasecmp(cmdbuf,"SETP",4)) {
 817                         cmd_setp(&cmdbuf[5]);
 818                         }
 819
 820                 else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 821                         cmd_lrms(&cmdbuf[5]);
 822                         }
 823
 824                 else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 825                         cmd_lkra(&cmdbuf[5]);
 826                         }
 827
 828                 else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 829                         cmd_lkrn(&cmdbuf[5]);
 830                         }
 831
 832                 else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 833                         cmd_lkro(&cmdbuf[5]);
 834                         }
 835
 836                 else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 837                         cmd_lzrm(&cmdbuf[5]);
 838                         }
 839
 840                 else if (!strncasecmp(cmdbuf,"GETU",4)) {
 841                         cmd_getu();
 842                         }
 843
 844                 else if (!strncasecmp(cmdbuf,"SETU",4)) {
 845                         cmd_setu(&cmdbuf[5]);
 846                         }
 847
 848                 else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 849                         cmd_goto(&cmdbuf[5]);
 850                         }
 851
 852                 else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 853                         cmd_msgs(&cmdbuf[5]);
 854                         }
 855
 856                 else if (!strncasecmp(cmdbuf,"WHOK",4)) {
 857                         cmd_whok();
 858                         }
 859
 860                 else if (!strncasecmp(cmdbuf,"RDIR",4)) {
 861                         cmd_rdir();
 862                         }
 863
 864                 else if (!strncasecmp(cmdbuf,"MSG0",4)) {
 865                         cmd_msg0(&cmdbuf[5]);
 866                         }
 867
 868                 else if (!strncasecmp(cmdbuf,"MSG2",4)) {
 869                         cmd_msg2(&cmdbuf[5]);
 870                         }
 871
 872                 else if (!strncasecmp(cmdbuf,"MSG3",4)) {
 873                         cmd_msg3(&cmdbuf[5]);
 874                         }
 875
 876                 else if (!strncasecmp(cmdbuf,"MSG4",4)) {
 877                         cmd_msg4(&cmdbuf[5]);
 878                         }
 879
 880                 else if (!strncasecmp(cmdbuf,"OPNA",4)) {
 881                         cmd_opna(&cmdbuf[5]);
 882                         }
 883
 884                 else if (!strncasecmp(cmdbuf,"INFO",4)) {
 885                         cmd_info();
 886                         }
 887
 888                 else if (!strncasecmp(cmdbuf,"SLRP",4)) {
 889                         cmd_slrp(&cmdbuf[5]);
 890                         }
 891
 892                 else if (!strncasecmp(cmdbuf,"INVT",4)) {
 893                         cmd_invt_kick(&cmdbuf[5],1);
 894                         }
 895
 896                 else if (!strncasecmp(cmdbuf,"KICK",4)) {
 897                         cmd_invt_kick(&cmdbuf[5],0);
 898                         }
 899
 900                 else if (!strncasecmp(cmdbuf,"GETR",4)) {
 901                         cmd_getr();
 902                         }
 903
 904                 else if (!strncasecmp(cmdbuf,"SETR",4)) {
 905                         cmd_setr(&cmdbuf[5]);
 906                         }
 907
 908                 else if (!strncasecmp(cmdbuf,"GETA",4)) {
 909                         cmd_geta();
 910                         }
 911
 912                 else if (!strncasecmp(cmdbuf,"SETA",4)) {
 913                         cmd_seta(&cmdbuf[5]);
 914                         }
 915
 916                 else if (!strncasecmp(cmdbuf,"ENT0",4)) {
 917                         cmd_ent0(&cmdbuf[5]);
 918                         }
 919
 920                 else if (!strncasecmp(cmdbuf,"ENT3",4)) {
 921                         cmd_ent3(&cmdbuf[5]);
 922                         }
 923
 924                 else if (!strncasecmp(cmdbuf,"RINF",4)) {
 925                         cmd_rinf();
 926                         }
 927
 928                 else if (!strncasecmp(cmdbuf,"DELE",4)) {
 929                         cmd_dele(&cmdbuf[5]);
 930                         }
 931
 932                 else if (!strncasecmp(cmdbuf,"KILL",4)) {
 933                         cmd_kill(&cmdbuf[5]);
 934                         }
 935
 936                 else if (!strncasecmp(cmdbuf,"CRE8",4)) {
 937                         cmd_cre8(&cmdbuf[5]);
 938                         }
 939
 940                 else if (!strncasecmp(cmdbuf,"MOVE",4)) {
 941                         cmd_move(&cmdbuf[5]);
 942                         }
 943
 944                 else if (!strncasecmp(cmdbuf,"FORG",4)) {
 945                         cmd_forg();
 946                         }
 947
 948                 else if (!strncasecmp(cmdbuf,"MESG",4)) {
 949                         cmd_mesg(&cmdbuf[5]);
 950                         }
 951
 952                 else if (!strncasecmp(cmdbuf,"EMSG",4)) {
 953                         cmd_emsg(&cmdbuf[5]);
 954                         }
 955
 956                 else if (!strncasecmp(cmdbuf,"GNUR",4)) {
 957                         cmd_gnur();
 958                         }
 959
 960                 else if (!strncasecmp(cmdbuf,"GREG",4)) {
 961                         cmd_greg(&cmdbuf[5]);
 962                         }
 963
 964                 else if (!strncasecmp(cmdbuf,"VALI",4)) {
 965                         cmd_vali(&cmdbuf[5]);
 966                         }
 967
 968                 else if (!strncasecmp(cmdbuf,"EINF",4)) {
 969                         cmd_einf(&cmdbuf[5]);
 970                         }
 971
 972                 else if (!strncasecmp(cmdbuf,"LIST",4)) {
 973                         cmd_list();
 974                         }
 975
 976                 else if (!strncasecmp(cmdbuf,"REGI",4)) {
 977                         cmd_regi();
 978                         }
 979
 980                 else if (!strncasecmp(cmdbuf,"CHEK",4)) {
 981                         cmd_chek();
 982                         }
 983
 984                 else if (!strncasecmp(cmdbuf,"DELF",4)) {
 985                         cmd_delf(&cmdbuf[5]);
 986                         }
 987
 988                 else if (!strncasecmp(cmdbuf,"MOVF",4)) {
 989                         cmd_movf(&cmdbuf[5]);
 990                         }
 991
 992                 else if (!strncasecmp(cmdbuf,"NETF",4)) {
 993                         cmd_netf(&cmdbuf[5]);
 994                         }
 995
 996                 else if (!strncasecmp(cmdbuf,"RWHO",4)) {
 997                         cmd_rwho();
 998                         }
 999
1000                 else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1001                         cmd_open(&cmdbuf[5]);
1002                         }
1003
1004                 else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1005                         cmd_clos();
1006                         }
1007
1008                 else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1009                         cmd_uopn(&cmdbuf[5]);
1010                         }
1011
1012                 else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1013                         cmd_ucls(&cmdbuf[5]);
1014                         }
1015
1016                 else if (!strncasecmp(cmdbuf,"READ",4)) {
1017                         cmd_read(&cmdbuf[5]);
1018                         }
1019
1020                 else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1021                         cmd_writ(&cmdbuf[5]);
1022                         }
1023
1024                 else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1025                         cmd_qusr(&cmdbuf[5]);
1026                         }
1027
1028                 else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1029                         cmd_echo(&cmdbuf[5]);
1030                         }
1031
1032                 else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1033                         cmd_oimg(&cmdbuf[5]);
1034                         }
1035
1036                 else if (!strncasecmp(cmdbuf,"MORE",4)) {
1037                         cmd_more();
1038                         }
1039
1040                 else if (!strncasecmp(cmdbuf,"NETP",4)) {
1041                         cmd_netp(&cmdbuf[5]);
1042                         }
1043
1044                 else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1045                         cmd_ndop(&cmdbuf[5]);
1046                         }
1047
1048                 else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1049                         cmd_nuop(&cmdbuf[5]);
1050                         }
1051
1052                 else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1053                         cmd_lflr();
1054                         }
1055
1056                 else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1057                         cmd_cflr(&cmdbuf[5]);
1058                         }
1059
1060                 else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1061                         cmd_kflr(&cmdbuf[5]);
1062                         }
1063
1064                 else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1065                         cmd_eflr(&cmdbuf[5]);
1066                         }
1067
1068                 else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1069                         cmd_iden(&cmdbuf[5]);
1070                         }
1071
1072                 else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1073                         cmd_ipgm(&cmdbuf[5]);
1074                         }
1075
1076                 else if (!strncasecmp(cmdbuf,"EBIO",4)) {
1077                         cmd_ebio();
1078                         }
1079
1080                 else if (!strncasecmp(cmdbuf,"RBIO",4)) {
1081                         cmd_rbio(&cmdbuf[5]);
1082                         }
1083
1084                 else if (!strncasecmp(cmdbuf,"LBIO",4)) {
1085                         cmd_lbio();
1086                         }
1087
1088                 else if (!strncasecmp(cmdbuf,"STEL",4)) {
1089                         cmd_stel(&cmdbuf[5]);
1090                         }
1091
1092                 else if (!strncasecmp(cmdbuf,"TERM",4)) {
1093                         cmd_term(&cmdbuf[5]);
1094                         }
1095
1096                 else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1097                         cmd_down();
1098                         }
1099
1100                 else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1101                         cmd_scdn(&cmdbuf[5]);
1102                         }
1103
1104                 else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1105                         cmd_nset(&cmdbuf[5]);
1106                         }
1107
1108                 else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1109                         cmd_uimg(&cmdbuf[5]);
1110                         }
1111
1112                 else if (!strncasecmp(cmdbuf, "UCHG", 4)) {
1113                         cmd_uchg(&cmdbuf[5]);
1114                         }
1115
1116                 else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1117                         cmd_time();
1118                         }
1119
1120                 else if (!strncasecmp(cmdbuf, "HCHG", 4)) {
1121                         cmd_hchg(&cmdbuf[5]);
1122                         }
1123
1124                 else if (!strncasecmp(cmdbuf, "RCHG", 4)) {
1125                         cmd_rchg(&cmdbuf[5]);
1126                         }
1127
1128                 else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1129                         cmd_agup(&cmdbuf[5]);
1130                         }
1131
1132                 else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1133                         cmd_asup(&cmdbuf[5]);
1134                         }
1135
1136                 else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1137                         cmd_gpex(&cmdbuf[5]);
1138                         }
1139
1140                 else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1141                         cmd_spex(&cmdbuf[5]);
1142                         }
1143
1144                 else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1145                         cmd_conf(&cmdbuf[5]);
1146                         }
1147
1148 #ifdef DEBUG_MEMORY_LEAKS
1149                 else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1150                         dump_tracked();
1151                         }
1152 #endif
1153
1154                 else if (!DLoader_Exec_Cmd(cmdbuf))
1155                         {
1156                            cprintf("%d Unrecognized or unsupported command.\n",
1157                                     ERROR);
1158                         }
1159
1160                 } while(strncasecmp(cmdbuf, "QUIT", 4));
1161
1162         cleanup(EXIT_NORMAL);
1163         return(NULL);
1164         }