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 int do_defrag = 0;
  44 int (*CtdlSendExpressMessageFunc) (char *, char *, char *) = NULL;
  45
  46 /*
  47  * Various things that need to be initialized at startup
  48  */
  49 void master_startup(void) {
  50         lprintf(7, "Opening databases\n");
  51         open_databases();
  52
  53         if (do_defrag)
  54                 defrag_databases();
  55
  56         lprintf(7, "Checking floor reference counts\n");
  57         check_ref_counts();
  58
  59         lprintf(7, "Creating base rooms (if necessary)\n");
  60         create_room(BASEROOM, 0, "", 0);
  61         create_room(AIDEROOM, 4, "", 0);
  62         create_room(config.c_twitroom, 0, "", 0);
  63         }
  64
  65 /*
  66  * Cleanup routine to be called when the server is shutting down.
  67  */
  68 void master_cleanup(void) {
  69         struct CleanupFunctionHook *fcn;
  70
  71         /* Cancel all running sessions */
  72         lprintf(7, "Cancelling running sessions...\n");
  73         while (ContextList != NULL) {
  74                 kill_session(ContextList->cs_pid);
  75                 }
  76
  77         /* Run any cleanup routines registered by loadable modules */
  78         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
  79                 (*fcn->h_function_pointer)();
  80                 }
  81
  82         /* Close databases */
  83         lprintf(7, "Closing databases\n");
  84         close_databases();
  85
  86         /* Do system-dependent stuff */
  87         sysdep_master_cleanup();
  88
  89         /* Now go away. */
  90         lprintf(3, "citserver: exiting.\n");
  91         fflush(stdout); fflush(stderr);
  92         exit(0);
  93         }
  94
  95
  96 /*
  97  * Free any per-session data allocated by modules or whatever
  98  */
  99 void deallocate_user_data(struct CitContext *con)
 100 {
 101         struct CtdlSessData *ptr;
 102
 103         begin_critical_section(S_SESSION_TABLE);
 104         while (con->FirstSessData != NULL) {
 105                 lprintf(9, "Deallocating user data symbol %ld\n",
 106                         con->FirstSessData->sym_id);
 107                 if (con->FirstSessData->sym_data != NULL)
 108                         phree(con->FirstSessData->sym_data);
 109                 ptr = con->FirstSessData->next;
 110                 phree(con->FirstSessData);
 111                 con->FirstSessData = ptr;
 112         }
 113         end_critical_section(S_SESSION_TABLE);
 114 }
 115
 116
 117
 118
 119 /*
 120  * Gracefully terminate the session and thread.
 121  * (This is called as a cleanup handler by the thread library.)
 122  *
 123  * All NON-system-dependent stuff is done in this function.
 124  * System-dependent session/thread cleanup is in cleanup() in sysdep.c
 125  */
 126 void cleanup_stuff(void *arg)
 127 {
 128
 129         lprintf(9, "cleanup_stuff() called\n");
 130
 131         lprintf(7, "Calling logout(%d)\n", CC->cs_pid);
 132         logout(CC);
 133
 134         rec_log(CL_TERMINATE,CC->curr_user);
 135         unlink(CC->temp);
 136         lprintf(3, "citserver[%3d]: ended.\n",CC->cs_pid);
 137
 138         /* Run any cleanup routines registered by loadable modules */
 139         PerformSessionHooks(EVT_STOP);
 140
 141         syslog(LOG_NOTICE,"session %d ended", CC->cs_pid);
 142
 143         /* Deallocate any user-data attached to this session */
 144         deallocate_user_data(CC);
 145
 146         /* Now get rid of the session and context */
 147         lprintf(7, "cleanup_stuff() calling RemoveContext(%d)\n", CC->cs_pid);
 148         RemoveContext(CC);
 149
 150         /* While we still have an extra thread with no user attached to it,
 151          * take the opportunity to do some housekeeping before exiting.
 152          */
 153         do_housekeeping();
 154         }
 155
 156
 157 /*
 158  * Get a dynamic symbol number for per-session user data.
 159  * This API call should be made only ONCE per symbol per citserver run.
 160  */
 161 int CtdlGetDynamicSymbol()
 162 {
 163         static unsigned int next_symbol = SYM_MAX;
 164         return ++next_symbol;
 165 }
 166
 167
 168
 169 /*
 170  * Return a pointer to some generic per-session user data.
 171  * (This function returns NULL if the requested symbol is not allocated.)
 172  *
 173  * NOTE: we use critical sections for allocating and de-allocating these,
 174  *       but not for locating one.
 175  */
 176 void *CtdlGetUserData(unsigned long requested_sym)
 177 {
 178         struct CtdlSessData *ptr;
 179
 180         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 181                 if (ptr->sym_id == requested_sym)
 182                         return(ptr->sym_data);
 183
 184         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 185                 requested_sym);
 186         return NULL;
 187 }
 188
 189
 190 /*
 191  * Allocate some generic per-session user data.
 192  */
 193 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 194 {
 195         struct CtdlSessData *ptr;
 196
 197         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 198
 199         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 200                 if (ptr->sym_id == requested_sym) {
 201                         lprintf(2, "ERROR: CtdlAllocUserData() requested for"
 202                                 " symbol id %ld already registered\n",
 203                                 requested_sym);
 204                         return;
 205                 }
 206         }
 207
 208         ptr = mallok(sizeof(struct CtdlSessData));
 209         ptr->sym_id = requested_sym;
 210         ptr->sym_data = mallok(num_bytes);
 211
 212         begin_critical_section(S_SESSION_TABLE);
 213         ptr->next = CC->FirstSessData;
 214         CC->FirstSessData = ptr;
 215         end_critical_section(S_SESSION_TABLE);
 216
 217         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 218 }
 219
 220
 221
 222
 223
 224 /*
 225  * set_wtmpsupp()  -  alter the session listing
 226  */
 227 void set_wtmpsupp(char *newtext)
 228 {
 229         strncpy(CC->cs_room,newtext,sizeof CC->cs_room);
 230         CC->cs_room[sizeof CC->cs_room - 1] = 0;
 231         time(&CC->cs_lastupdt);
 232
 233         /* Run any routines registered by loadable modules */
 234         PerformSessionHooks(EVT_NEWROOM);
 235         }
 236
 237
 238 /*
 239  * call set_wtmpsupp() with the name of the current room, modified a bit...
 240  */
 241 void set_wtmpsupp_to_current_room() {
 242         if (CC->quickroom.QRflags & QR_PRIVATE) {
 243                 set_wtmpsupp("<private room>");
 244                 }
 245         else if (CC->quickroom.QRflags & QR_MAILBOX) {
 246                 set_wtmpsupp(&CC->quickroom.QRname[11]);
 247                 }
 248         else {
 249                 set_wtmpsupp(CC->quickroom.QRname);
 250                 }
 251         }
 252
 253
 254
 255 /*
 256  * cmd_info()  -  tell the client about this server
 257  */
 258 void cmd_info(void) {
 259         cprintf("%d Server info:\n",LISTING_FOLLOWS);
 260         cprintf("%d\n",CC->cs_pid);
 261         cprintf("%s\n",config.c_nodename);
 262         cprintf("%s\n",config.c_humannode);
 263         cprintf("%s\n",config.c_fqdn);
 264         cprintf("%s\n",CITADEL);
 265         cprintf("%d\n",REV_LEVEL);
 266         cprintf("%s\n",config.c_bbs_city);
 267         cprintf("%s\n",config.c_sysadm);
 268         cprintf("%d\n",SERVER_TYPE);
 269         cprintf("%s\n",config.c_moreprompt);
 270         cprintf("1\n"); /* 1 = yes, this system supports floors */
 271         cprintf("1\n"); /* 1 = we support the extended paging options */
 272         cprintf("000\n");
 273         }
 274
 275 void cmd_rchg(char *argbuf)
 276 {
 277         char newroomname[256]; /* set to 256 to prevent buffer overruns <dme>*/
 278
 279         extract(newroomname, argbuf, 0);
 280         newroomname[ROOMNAMELEN] = 0;
 281         if (strlen(newroomname) > 0) {
 282                 strncpy(CC->fake_roomname, newroomname, ROOMNAMELEN);
 283                 CC->fake_roomname[ROOMNAMELEN - 1] = 0;
 284                 }
 285         else {
 286                 strcpy(CC->fake_roomname, "");
 287                 }
 288         cprintf("%d OK\n", OK);
 289 }
 290
 291 void cmd_hchg(char *newhostname)
 292 {
 293    if ((newhostname) && (newhostname[0]))
 294    {
 295       memset(CC->fake_hostname, 0, 25);
 296       strncpy(CC->fake_hostname, newhostname, 24);
 297    }
 298    else
 299       strcpy(CC->fake_hostname, "");
 300    cprintf("%d OK\n",OK);
 301 }
 302
 303 void cmd_uchg(char *newusername)
 304 {
 305    if (CC->usersupp.axlevel < 6)
 306    {
 307       cprintf("%d You must be an Aide to use UCHG.\n",
 308                 ERROR+HIGHER_ACCESS_REQUIRED);
 309       return;
 310    }
 311    if ((newusername) && (newusername[0]))
 312    {
 313       CC->cs_flags &= ~CS_STEALTH;
 314       memset(CC->fake_username, 0, 32);
 315       if (strncasecmp(newusername, CC->curr_user, strlen(CC->curr_user)))
 316          strncpy(CC->fake_username, newusername, 31);
 317    }
 318    else
 319    {
 320       CC->fake_username[0] = '\0';
 321       CC->cs_flags |= CS_STEALTH;
 322    }
 323    cprintf("%d\n",OK);
 324 }
 325
 326 /*
 327  * returns an asterisk if there are any express messages waiting,
 328  * space otherwise.
 329  */
 330 char check_express(void) {
 331         if (CC->FirstExpressMessage == NULL) {
 332                 return(' ');
 333                 }
 334         else {
 335                 return('*');
 336                 }
 337         }
 338
 339 void cmd_time(void)
 340 {
 341    time_t tv;
 342
 343    tv = time(NULL);
 344
 345    cprintf("%d %ld\n", OK, tv);
 346 }
 347
 348 /*
 349  * Check whether two hostnames match.
 350  * "Realname" should be an actual name of a client that is trying to connect;
 351  * "testname" should be the value we are comparing it with. The idea is that we
 352  * want to compare with both the abbreviated and fully-qualified versions of
 353  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 354  */
 355 static int hostnames_match(const char *realname, const char *testname) {
 356         struct hostent *he;
 357         int retval = 0;
 358
 359         if (!strcasecmp(realname, testname))
 360                 return 1;
 361
 362 #ifdef HAVE_NONREENTRANT_NETDB
 363         begin_critical_section(S_NETDB);
 364 #endif
 365
 366         if ((he = gethostbyname(testname)) != NULL)
 367                 if (!strcasecmp(realname, he->h_name))
 368                         retval = 1;
 369
 370 #ifdef HAVE_NONREENTRANT_NETDB
 371         end_critical_section(S_NETDB);
 372 #endif
 373
 374         return retval;
 375         }
 376
 377 /*
 378  * check a hostname against the public_clients file
 379  */
 380 int is_public_client(char *where)
 381 {
 382         char buf[256];
 383         FILE *fp;
 384
 385         if (hostnames_match(where,"localhost")) return(1);
 386         if (hostnames_match(where,config.c_fqdn)) return(1);
 387
 388         fp = fopen("public_clients","r");
 389         if (fp == NULL) return(0);
 390
 391         while (fgets(buf,256,fp)!=NULL) {
 392                 while (isspace((buf[strlen(buf)-1])))
 393                         buf[strlen(buf)-1] = 0;
 394                 if (hostnames_match(where,buf)) {
 395                         fclose(fp);
 396                         return(1);
 397                         }
 398                 }
 399
 400         fclose(fp);
 401         return(0);
 402         }
 403
 404
 405 /*
 406  * the client is identifying itself to the server
 407  */
 408 void cmd_iden(char *argbuf)
 409 {
 410         int dev_code;
 411         int cli_code;
 412         int rev_level;
 413         char desc[256];
 414         char from_host[256];
 415         struct in_addr addr;
 416
 417         if (num_parms(argbuf)<4) {
 418                 cprintf("%d usage error\n",ERROR);
 419                 return;
 420                 }
 421
 422         dev_code = extract_int(argbuf,0);
 423         cli_code = extract_int(argbuf,1);
 424         rev_level = extract_int(argbuf,2);
 425         extract(desc,argbuf,3);
 426
 427         strncpy(from_host,config.c_fqdn,sizeof from_host);
 428         from_host[sizeof from_host - 1] = 0;
 429         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 430
 431         CC->cs_clientdev = dev_code;
 432         CC->cs_clienttyp = cli_code;
 433         CC->cs_clientver = rev_level;
 434         strncpy(CC->cs_clientname,desc,31);
 435         CC->cs_clientname[31] = 0;
 436
 437         if ((strlen(from_host)>0) &&
 438            (is_public_client(CC->cs_host))) {
 439                 if (inet_aton(from_host, &addr))
 440                         locate_host(CC->cs_host, &addr);
 441                 else {
 442                         strncpy(CC->cs_host,from_host,24);
 443                         CC->cs_host[24] = 0;
 444                         }
 445                 }
 446         set_wtmpsupp_to_current_room();
 447
 448         syslog(LOG_NOTICE,"client %d/%d/%01d.%02d (%s)\n",
 449                 dev_code,
 450                 cli_code,
 451                 (rev_level / 100),
 452                 (rev_level % 100),
 453                 desc);
 454                 cprintf("%d Ok\n",OK);
 455         }
 456
 457
 458 /*
 459  * enter or exit "stealth mode"
 460  */
 461 void cmd_stel(char *cmdbuf)
 462 {
 463         int requested_mode;
 464
 465         requested_mode = extract_int(cmdbuf,0);
 466         if (requested_mode !=0) requested_mode = 1;
 467
 468         if (!CC->logged_in) {
 469                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 470                 return;
 471                 }
 472
 473         if (CC->usersupp.axlevel < 6) {
 474                 cprintf("%d You must be an Aide to use stealth mode.\n",
 475                         ERROR+HIGHER_ACCESS_REQUIRED);
 476                 return;
 477                 }
 478
 479         if (CC->cs_flags & CS_STEALTH) {
 480                 if (requested_mode == 0)
 481                         CC->cs_flags = CC->cs_flags-CS_STEALTH;
 482                 }
 483         else {
 484                 if (requested_mode == 1)
 485                         CC->cs_flags = CC->cs_flags|CS_STEALTH;
 486                 }
 487
 488         set_wtmpsupp_to_current_room();
 489         cprintf("%d Ok\n",OK);
 490         }
 491
 492
 493
 494
 495 /*
 496  * display system messages or help
 497  */
 498 void cmd_mesg(char *mname)
 499 {
 500         FILE *mfp;
 501         char targ[256];
 502         char buf[256];
 503         char *dirs[2];
 504
 505         extract(buf,mname,0);
 506
 507
 508         dirs[0]=mallok(64);
 509         dirs[1]=mallok(64);
 510         strcpy(dirs[0],"messages");
 511         strcpy(dirs[1],"help");
 512         mesg_locate(targ,buf,2,dirs);
 513         phree(dirs[0]);
 514         phree(dirs[1]);
 515
 516
 517         if (strlen(targ)==0) {
 518                 cprintf("%d '%s' not found.\n",ERROR,mname);
 519                 return;
 520                 }
 521
 522         mfp = fopen(targ,"r");
 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",LISTING_FOLLOWS,buf);
 529
 530         while (fgets(buf,255,mfp)!=NULL) {
 531                 buf[strlen(buf)-1] = 0;
 532                 do_help_subst(buf);
 533                 cprintf("%s\n",buf);
 534                 }
 535
 536         fclose(mfp);
 537         cprintf("000\n");
 538         }
 539
 540
 541 /*
 542  * enter system messages or help
 543  */
 544 void cmd_emsg(char *mname)
 545 {
 546         FILE *mfp;
 547         char targ[256];
 548         char buf[256];
 549         char *dirs[2];
 550         int a;
 551
 552         if (CC->usersupp.axlevel < 6) {
 553                 cprintf("%d You must be an Aide to edit system messages.\n",
 554                         ERROR+HIGHER_ACCESS_REQUIRED);
 555                 return;
 556                 }
 557
 558         extract(buf,mname,0);
 559         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 560                 if (buf[a] == '/') buf[a] = '.';
 561                 }
 562
 563         dirs[0]=mallok(64);
 564         dirs[1]=mallok(64);
 565         strcpy(dirs[0],"messages");
 566         strcpy(dirs[1],"help");
 567         mesg_locate(targ,buf,2,dirs);
 568         phree(dirs[0]);
 569         phree(dirs[1]);
 570
 571         if (strlen(targ)==0) {
 572                 snprintf(targ, sizeof targ, "./help/%s", buf);
 573                 }
 574
 575         mfp = fopen(targ,"w");
 576         if (mfp==NULL) {
 577                 cprintf("%d Cannot open '%s': %s\n",
 578                         ERROR,targ,strerror(errno));
 579                 return;
 580                 }
 581         cprintf("%d %s\n", SEND_LISTING, targ);
 582
 583         while (client_gets(buf), strcmp(buf, "000")) {
 584                 fprintf(mfp, "%s\n", buf);
 585                 }
 586
 587         fclose(mfp);
 588         }
 589
 590
 591 /*
 592  * who's online
 593  */
 594 void cmd_rwho(void) {
 595         struct CitContext *cptr;
 596         int spoofed = 0;
 597         int aide;
 598         char un[40], room[40], host[40], flags[5];
 599
 600         aide = CC->usersupp.axlevel >= 6;
 601         cprintf("%d\n",LISTING_FOLLOWS);
 602
 603         for (cptr = ContextList; cptr != NULL; cptr = cptr->next)
 604         {
 605                 flags[0] = '\0';
 606                 spoofed = 0;
 607
 608                 if (cptr->cs_flags & CS_POSTING)
 609                    strcat(flags, "*");
 610                 else
 611                    strcat(flags, ".");
 612
 613                 if (cptr->fake_username[0])
 614                 {
 615                    strcpy(un, cptr->fake_username);
 616                    spoofed = 1;
 617                 }
 618                 else
 619                    strcpy(un, cptr->curr_user);
 620
 621                 if (cptr->fake_hostname[0])
 622                 {
 623                    strcpy(host, cptr->fake_hostname);
 624                    spoofed = 1;
 625                 }
 626                 else
 627                    strcpy(host, cptr->cs_host);
 628
 629                 if (cptr->fake_roomname[0])
 630                 {
 631                    strcpy(room, cptr->fake_roomname);
 632                    spoofed = 1;
 633                 }
 634                 else
 635                    strcpy(room, cptr->cs_room);
 636
 637
 638                 if ((aide) && (spoofed))
 639                    strcat(flags, "+");
 640
 641                 if ((cptr->cs_flags & CS_STEALTH) && (aide))
 642                    strcat(flags, "-");
 643
 644                 if (((cptr->cs_flags&CS_STEALTH)==0) || (aide))
 645                 {
 646                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 647                                 cptr->cs_pid, un, room,
 648                                 host, cptr->cs_clientname,
 649                                 (long)(cptr->lastidle),
 650                                 cptr->lastcmdname, flags);
 651                 }
 652                 if ((spoofed) && (aide))
 653                 {
 654                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 655                                 cptr->cs_pid, cptr->curr_user, cptr->cs_room,
 656                                 cptr->cs_host, cptr->cs_clientname,
 657                                 (long)(cptr->lastidle),
 658                                 cptr->lastcmdname, flags);
 659
 660                 }
 661         }
 662         cprintf("000\n");
 663         }
 664
 665
 666 /*
 667  * Terminate another running session
 668  */
 669 void cmd_term(char *cmdbuf)
 670 {
 671         int session_num;
 672         struct CitContext *ccptr;
 673         int session_to_kill = 0;
 674
 675         if (!CC->logged_in) {
 676                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 677                 return;
 678                 }
 679
 680         if (CC->usersupp.axlevel < 6) {
 681                 cprintf("%d You must be an Aide to terminate sessions.\n",
 682                         ERROR+HIGHER_ACCESS_REQUIRED);
 683                 return;
 684                 }
 685
 686         session_num = extract_int(cmdbuf, 0);
 687         if (session_num == CC->cs_pid) {
 688                 cprintf("%d You can't kill your own session.\n", ERROR);
 689                 return;
 690                 }
 691
 692         lprintf(9, "Locating session to kill\n");
 693         begin_critical_section(S_SESSION_TABLE);
 694         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 695                 if (session_num == ccptr->cs_pid) {
 696                         session_to_kill = ccptr->cs_pid;
 697                         }
 698                 }
 699         end_critical_section(S_SESSION_TABLE);
 700         lprintf(9, "session_to_kill == %d\n", session_to_kill);
 701
 702         if (session_to_kill > 0) {
 703                 lprintf(9, "calling kill_session()\n");
 704                 kill_session(session_to_kill);
 705                 cprintf("%d Session terminated.\n", OK);
 706                 }
 707         else {
 708                 cprintf("%d No such session.\n", ERROR);
 709                 }
 710         }
 711
 712
 713
 714
 715
 716 /*
 717  * get the paginator prompt
 718  */
 719 void cmd_more(void) {
 720         cprintf("%d %s\n",OK,config.c_moreprompt);
 721         }
 722
 723 /*
 724  * echo
 725  */
 726 void cmd_echo(char *etext)
 727 {
 728         cprintf("%d %s\n",OK,etext);
 729         }
 730
 731
 732
 733 /*
 734  * identify as internal program
 735  */
 736 void cmd_ipgm(char *argbuf)
 737 {
 738         int secret;
 739
 740         secret = extract_int(argbuf, 0);
 741         if (secret == config.c_ipgm_secret) {
 742                 CC->internal_pgm = 1;
 743                 strcpy(CC->curr_user, "<internal program>");
 744                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 745                 cprintf("%d Authenticated as an internal program.\n",OK);
 746                 }
 747         else {
 748                 cprintf("%d Authentication failed.\n",ERROR);
 749                 }
 750         }
 751
 752
 753 /*
 754  * Shut down the server
 755  */
 756 void cmd_down(void) {
 757         if (!CC->logged_in) {
 758                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 759                 return;
 760                 }
 761
 762         if (CC->usersupp.axlevel < 6) {
 763                 cprintf("%d You must be an Aide to shut down the server.\n",
 764                         ERROR+HIGHER_ACCESS_REQUIRED);
 765                 return;
 766                 }
 767
 768         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 769         master_cleanup();
 770         }
 771
 772 /*
 773  * Schedule or cancel a server shutdown
 774  */
 775 void cmd_scdn(char *argbuf)
 776 {
 777         int new_state;
 778
 779         if (!CC->logged_in) {
 780                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 781                 return;
 782                 }
 783
 784         if (CC->usersupp.axlevel < 6) {
 785                 cprintf("%d You must be an Aide to schedule a shutdown.\n",
 786                         ERROR+HIGHER_ACCESS_REQUIRED);
 787                 return;
 788                 }
 789
 790         new_state = extract_int(argbuf, 0);
 791         if ((new_state == 0) || (new_state == 1)) {
 792                 ScheduledShutdown = new_state;
 793                 }
 794         cprintf("%d %d\n", OK, ScheduledShutdown);
 795         }
 796
 797
 798 /*
 799  * main context loop
 800  */
 801 void *context_loop(struct CitContext *con)
 802 {
 803         char cmdbuf[256];
 804         int num_sessions, len;
 805         struct sockaddr_in sin;
 806
 807         /*
 808          * Wedge our way into the context table.
 809          */
 810         InitMyContext(con);
 811
 812         /*
 813          * Initialize some variables specific to our context.
 814          */
 815         CC->logged_in = 0;
 816         CC->internal_pgm = 0;
 817         CC->download_fp = NULL;
 818         CC->upload_fp = NULL;
 819         CC->cs_pid = con->client_socket;        /* not necessarily portable */
 820         CC->FirstExpressMessage = NULL;
 821         time(&CC->lastcmd);
 822         time(&CC->lastidle);
 823         strcpy(CC->lastcmdname, "    ");
 824         strcpy(CC->cs_clientname, "(unknown)");
 825         strcpy(CC->curr_user,"(not logged in)");
 826         strcpy(CC->net_node,"");
 827         snprintf(CC->temp, sizeof CC->temp, tmpnam(NULL));
 828         strcpy(CC->cs_room, "(no room)");
 829         strncpy(CC->cs_host, config.c_fqdn, sizeof CC->cs_host);
 830         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 831         len = sizeof sin;
 832         if (!getpeername(CC->client_socket, (struct sockaddr *) &sin, &len))
 833                 locate_host(CC->cs_host, &sin.sin_addr);
 834         CC->cs_flags = 0;
 835         CC->upload_type = UPL_FILE;
 836         CC->dl_is_net = 0;
 837         CC->FirstSessData = NULL;
 838
 839         num_sessions = session_count();
 840         CC->nologin = 0;
 841         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 842                 CC->nologin = 1;
 843
 844         if (CC->nologin==1) {
 845            cprintf("%d %s: Too many users are already online (maximum is %d)\n",
 846                 ERROR+MAX_SESSIONS_EXCEEDED,
 847                 config.c_nodename,config.c_maxsessions);
 848                 }
 849         else {
 850            cprintf("%d %s Citadel/UX server ready.\n",OK,config.c_nodename);
 851                 }
 852
 853         lprintf(3, "citserver[%3d]: started.\n", CC->cs_pid);
 854
 855         /* Run any session startup routines registered by loadable modules */
 856         PerformSessionHooks(EVT_START);
 857
 858         rec_log(CL_CONNECT, "");
 859
 860         do {
 861                 time(&CC->lastcmd);
 862                 memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 863                 if (client_gets(cmdbuf) < 1) cleanup(EXIT_NULL);
 864                 lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 865
 866                 /*
 867                  * Let other clients see the last command we executed, and
 868                  * update the idle time, but not NOOP, PEXP, or GEXP.
 869                  */
 870                 if ( (strncasecmp(cmdbuf, "NOOP", 4))
 871                    && (strncasecmp(cmdbuf, "PEXP", 4))
 872                    && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 873                         strcpy(CC->lastcmdname, "    ");
 874                         strncpy(CC->lastcmdname, cmdbuf, 4);
 875                         time(&CC->lastidle);
 876                         }
 877
 878                 if ((strncasecmp(cmdbuf, "ENT0", 4)) && (strncasecmp(cmdbuf, "MESG", 4)) && (strncasecmp(cmdbuf, "MSGS", 4)))
 879                 {
 880                    CC->cs_flags &= ~CS_POSTING;
 881                 }
 882
 883 /*
 884  * This loop recognizes all server commands.
 885  */
 886
 887                 if (!strncasecmp(cmdbuf,"NOOP",4)) {
 888                         cprintf("%d%cok\n",OK,check_express());
 889                         }
 890
 891                 else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 892                         cprintf("%d Goodbye.\n",OK);
 893                         }
 894
 895                 else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 896                         if (CC->logged_in) logout(CC);
 897                         cprintf("%d logged out.\n",OK);
 898                         }
 899
 900                 else if (!strncasecmp(cmdbuf,"USER",4)) {
 901                         cmd_user(&cmdbuf[5]);
 902                         }
 903
 904                 else if (!strncasecmp(cmdbuf,"PASS",4)) {
 905                         cmd_pass(&cmdbuf[5]);
 906                         }
 907
 908                 else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 909                         cmd_newu(&cmdbuf[5]);
 910                         }
 911
 912                 else if (!strncasecmp(cmdbuf,"SETP",4)) {
 913                         cmd_setp(&cmdbuf[5]);
 914                         }
 915
 916                 else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 917                         cmd_lrms(&cmdbuf[5]);
 918                         }
 919
 920                 else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 921                         cmd_lkra(&cmdbuf[5]);
 922                         }
 923
 924                 else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 925                         cmd_lkrn(&cmdbuf[5]);
 926                         }
 927
 928                 else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 929                         cmd_lkro(&cmdbuf[5]);
 930                         }
 931
 932                 else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 933                         cmd_lzrm(&cmdbuf[5]);
 934                         }
 935
 936                 else if (!strncasecmp(cmdbuf,"GETU",4)) {
 937                         cmd_getu();
 938                         }
 939
 940                 else if (!strncasecmp(cmdbuf,"SETU",4)) {
 941                         cmd_setu(&cmdbuf[5]);
 942                         }
 943
 944                 else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 945                         cmd_goto(&cmdbuf[5]);
 946                         }
 947
 948                 else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 949                         cmd_msgs(&cmdbuf[5]);
 950                         }
 951
 952                 else if (!strncasecmp(cmdbuf,"WHOK",4)) {
 953                         cmd_whok();
 954                         }
 955
 956                 else if (!strncasecmp(cmdbuf,"RDIR",4)) {
 957                         cmd_rdir();
 958                         }
 959
 960                 else if (!strncasecmp(cmdbuf,"MSG0",4)) {
 961                         cmd_msg0(&cmdbuf[5]);
 962                         }
 963
 964                 else if (!strncasecmp(cmdbuf,"MSG2",4)) {
 965                         cmd_msg2(&cmdbuf[5]);
 966                         }
 967
 968                 else if (!strncasecmp(cmdbuf,"MSG3",4)) {
 969                         cmd_msg3(&cmdbuf[5]);
 970                         }
 971
 972                 else if (!strncasecmp(cmdbuf,"MSG4",4)) {
 973                         cmd_msg4(&cmdbuf[5]);
 974                         }
 975
 976                 else if (!strncasecmp(cmdbuf,"OPNA",4)) {
 977                         cmd_opna(&cmdbuf[5]);
 978                         }
 979
 980                 else if (!strncasecmp(cmdbuf,"INFO",4)) {
 981                         cmd_info();
 982                         }
 983
 984                 else if (!strncasecmp(cmdbuf,"SLRP",4)) {
 985                         cmd_slrp(&cmdbuf[5]);
 986                         }
 987
 988                 else if (!strncasecmp(cmdbuf,"INVT",4)) {
 989                         cmd_invt_kick(&cmdbuf[5],1);
 990                         }
 991
 992                 else if (!strncasecmp(cmdbuf,"KICK",4)) {
 993                         cmd_invt_kick(&cmdbuf[5],0);
 994                         }
 995
 996                 else if (!strncasecmp(cmdbuf,"GETR",4)) {
 997                         cmd_getr();
 998                         }
 999
1000                 else if (!strncasecmp(cmdbuf,"SETR",4)) {
1001                         cmd_setr(&cmdbuf[5]);
1002                         }
1003
1004                 else if (!strncasecmp(cmdbuf,"GETA",4)) {
1005                         cmd_geta();
1006                         }
1007
1008                 else if (!strncasecmp(cmdbuf,"SETA",4)) {
1009                         cmd_seta(&cmdbuf[5]);
1010                         }
1011
1012                 else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1013                         cmd_ent0(&cmdbuf[5]);
1014                         }
1015
1016                 else if (!strncasecmp(cmdbuf,"ENT3",4)) {
1017                         cmd_ent3(&cmdbuf[5]);
1018                         }
1019
1020                 else if (!strncasecmp(cmdbuf,"RINF",4)) {
1021                         cmd_rinf();
1022                         }
1023
1024                 else if (!strncasecmp(cmdbuf,"DELE",4)) {
1025                         cmd_dele(&cmdbuf[5]);
1026                         }
1027
1028                 else if (!strncasecmp(cmdbuf,"KILL",4)) {
1029                         cmd_kill(&cmdbuf[5]);
1030                         }
1031
1032                 else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1033                         cmd_cre8(&cmdbuf[5]);
1034                         }
1035
1036                 else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1037                         cmd_move(&cmdbuf[5]);
1038                         }
1039
1040                 else if (!strncasecmp(cmdbuf,"FORG",4)) {
1041                         cmd_forg();
1042                         }
1043
1044                 else if (!strncasecmp(cmdbuf,"MESG",4)) {
1045                         cmd_mesg(&cmdbuf[5]);
1046                         }
1047
1048                 else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1049                         cmd_emsg(&cmdbuf[5]);
1050                         }
1051
1052                 else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1053                         cmd_gnur();
1054                         }
1055
1056                 else if (!strncasecmp(cmdbuf,"GREG",4)) {
1057                         cmd_greg(&cmdbuf[5]);
1058                         }
1059
1060                 else if (!strncasecmp(cmdbuf,"VALI",4)) {
1061                         cmd_vali(&cmdbuf[5]);
1062                         }
1063
1064                 else if (!strncasecmp(cmdbuf,"EINF",4)) {
1065                         cmd_einf(&cmdbuf[5]);
1066                         }
1067
1068                 else if (!strncasecmp(cmdbuf,"LIST",4)) {
1069                         cmd_list();
1070                         }
1071
1072                 else if (!strncasecmp(cmdbuf,"REGI",4)) {
1073                         cmd_regi();
1074                         }
1075
1076                 else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1077                         cmd_chek();
1078                         }
1079
1080                 else if (!strncasecmp(cmdbuf,"DELF",4)) {
1081                         cmd_delf(&cmdbuf[5]);
1082                         }
1083
1084                 else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1085                         cmd_movf(&cmdbuf[5]);
1086                         }
1087
1088                 else if (!strncasecmp(cmdbuf,"NETF",4)) {
1089                         cmd_netf(&cmdbuf[5]);
1090                         }
1091
1092                 else if (!strncasecmp(cmdbuf,"RWHO",4)) {
1093                         cmd_rwho();
1094                         }
1095
1096                 else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1097                         cmd_open(&cmdbuf[5]);
1098                         }
1099
1100                 else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1101                         cmd_clos();
1102                         }
1103
1104                 else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1105                         cmd_uopn(&cmdbuf[5]);
1106                         }
1107
1108                 else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1109                         cmd_ucls(&cmdbuf[5]);
1110                         }
1111
1112                 else if (!strncasecmp(cmdbuf,"READ",4)) {
1113                         cmd_read(&cmdbuf[5]);
1114                         }
1115
1116                 else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1117                         cmd_writ(&cmdbuf[5]);
1118                         }
1119
1120                 else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1121                         cmd_qusr(&cmdbuf[5]);
1122                         }
1123
1124                 else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1125                         cmd_echo(&cmdbuf[5]);
1126                         }
1127
1128                 else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1129                         cmd_oimg(&cmdbuf[5]);
1130                         }
1131
1132                 else if (!strncasecmp(cmdbuf,"MORE",4)) {
1133                         cmd_more();
1134                         }
1135
1136                 else if (!strncasecmp(cmdbuf,"NETP",4)) {
1137                         cmd_netp(&cmdbuf[5]);
1138                         }
1139
1140                 else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1141                         cmd_ndop(&cmdbuf[5]);
1142                         }
1143
1144                 else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1145                         cmd_nuop(&cmdbuf[5]);
1146                         }
1147
1148                 else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1149                         cmd_lflr();
1150                         }
1151
1152                 else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1153                         cmd_cflr(&cmdbuf[5]);
1154                         }
1155
1156                 else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1157                         cmd_kflr(&cmdbuf[5]);
1158                         }
1159
1160                 else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1161                         cmd_eflr(&cmdbuf[5]);
1162                         }
1163
1164                 else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1165                         cmd_iden(&cmdbuf[5]);
1166                         }
1167
1168                 else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1169                         cmd_ipgm(&cmdbuf[5]);
1170                         }
1171
1172                 else if (!strncasecmp(cmdbuf,"EBIO",4)) {
1173                         cmd_ebio();
1174                         }
1175
1176                 else if (!strncasecmp(cmdbuf,"RBIO",4)) {
1177                         cmd_rbio(&cmdbuf[5]);
1178                         }
1179
1180                 else if (!strncasecmp(cmdbuf,"LBIO",4)) {
1181                         cmd_lbio();
1182                         }
1183
1184                 else if (!strncasecmp(cmdbuf,"STEL",4)) {
1185                         cmd_stel(&cmdbuf[5]);
1186                         }
1187
1188                 else if (!strncasecmp(cmdbuf,"TERM",4)) {
1189                         cmd_term(&cmdbuf[5]);
1190                         }
1191
1192                 else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1193                         cmd_down();
1194                         }
1195
1196                 else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1197                         cmd_scdn(&cmdbuf[5]);
1198                         }
1199
1200                 else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1201                         cmd_nset(&cmdbuf[5]);
1202                         }
1203
1204                 else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1205                         cmd_uimg(&cmdbuf[5]);
1206                         }
1207
1208                 else if (!strncasecmp(cmdbuf, "UCHG", 4)) {
1209                         cmd_uchg(&cmdbuf[5]);
1210                         }
1211
1212                 else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1213                         cmd_time();
1214                         }
1215
1216                 else if (!strncasecmp(cmdbuf, "HCHG", 4)) {
1217                         cmd_hchg(&cmdbuf[5]);
1218                         }
1219
1220                 else if (!strncasecmp(cmdbuf, "RCHG", 4)) {
1221                         cmd_rchg(&cmdbuf[5]);
1222                         }
1223
1224                 else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1225                         cmd_agup(&cmdbuf[5]);
1226                         }
1227
1228                 else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1229                         cmd_asup(&cmdbuf[5]);
1230                         }
1231
1232                 else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1233                         cmd_gpex(&cmdbuf[5]);
1234                         }
1235
1236                 else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1237                         cmd_spex(&cmdbuf[5]);
1238                         }
1239
1240                 else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1241                         cmd_conf(&cmdbuf[5]);
1242                         }
1243
1244 #ifdef DEBUG_MEMORY_LEAKS
1245                 else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1246                         dump_tracked();
1247                         }
1248 #endif
1249
1250                 else if (!DLoader_Exec_Cmd(cmdbuf))
1251                         {
1252                            cprintf("%d Unrecognized or unsupported command.\n",
1253                                     ERROR);
1254                         }
1255
1256                 /* Run any after-each-command outines registered by modules */
1257                 PerformSessionHooks(EVT_CMD);
1258
1259                 } while(strncasecmp(cmdbuf, "QUIT", 4));
1260
1261         cleanup(EXIT_NORMAL);
1262         return(NULL);
1263         }