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
  45 /*
  46  * Various things that need to be initialized at startup
  47  */
  48 void master_startup(void) {
  49         lprintf(7, "Opening databases\n");
  50         open_databases();
  51
  52         if (do_defrag)
  53                 defrag_databases();
  54
  55         lprintf(7, "Checking floor reference counts\n");
  56         check_ref_counts();
  57
  58         lprintf(7, "Creating base rooms (if necessary)\n");
  59         create_room(BASEROOM, 0, "", 0);
  60         create_room(AIDEROOM, 4, "", 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         while (ContextList != NULL) {
  73                 kill_session(ContextList->cs_pid);
  74                 }
  75
  76         /* Run any cleanup routines registered by loadable modules */
  77         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
  78                 (*fcn->h_function_pointer)();
  79                 }
  80
  81         /* Close databases */
  82         lprintf(7, "Closing databases\n");
  83         close_databases();
  84
  85         /* Do system-dependent stuff */
  86         sysdep_master_cleanup();
  87
  88         /* Now go away. */
  89         lprintf(3, "citserver: exiting.\n");
  90         fflush(stdout); fflush(stderr);
  91         exit(0);
  92         }
  93
  94
  95 /*
  96  * Free any per-session data allocated by modules or whatever
  97  */
  98 void deallocate_user_data(struct CitContext *con)
  99 {
 100         struct CtdlSessData *ptr;
 101
 102         begin_critical_section(S_SESSION_TABLE);
 103         while (con->FirstSessData != NULL) {
 104                 lprintf(9, "Deallocating user data symbol %ld\n",
 105                         con->FirstSessData->sym_id);
 106                 if (con->FirstSessData->sym_data != NULL)
 107                         phree(con->FirstSessData->sym_data);
 108                 ptr = con->FirstSessData->next;
 109                 phree(con->FirstSessData);
 110                 con->FirstSessData = ptr;
 111         }
 112         end_critical_section(S_SESSION_TABLE);
 113 }
 114
 115
 116
 117
 118 /*
 119  * Gracefully terminate the session and thread.
 120  * (This is called as a cleanup handler by the thread library.)
 121  *
 122  * All NON-system-dependent stuff is done in this function.
 123  * System-dependent session/thread cleanup is in cleanup() in sysdep.c
 124  */
 125 void cleanup_stuff(void *arg)
 126 {
 127
 128         lprintf(9, "cleanup_stuff() called\n");
 129
 130         lprintf(7, "Calling logout(%d)\n", CC->cs_pid);
 131         logout(CC);
 132
 133         rec_log(CL_TERMINATE,CC->curr_user);
 134         unlink(CC->temp);
 135         lprintf(3, "citserver[%3d]: ended.\n",CC->cs_pid);
 136
 137         /* Run any cleanup routines registered by loadable modules */
 138         PerformSessionHooks(EVT_STOP);
 139
 140         syslog(LOG_NOTICE,"session %d ended", CC->cs_pid);
 141
 142         /* Deallocate any user-data attached to this session */
 143         deallocate_user_data(CC);
 144
 145         /* Now get rid of the session and context */
 146         lprintf(7, "cleanup_stuff() calling RemoveContext(%d)\n", CC->cs_pid);
 147         RemoveContext(CC);
 148
 149         /* While we still have an extra thread with no user attached to it,
 150          * take the opportunity to do some housekeeping before exiting.
 151          */
 152         do_housekeeping();
 153         }
 154
 155
 156 /*
 157  * Get a dynamic symbol number for per-session user data.
 158  * This API call should be made only ONCE per symbol per citserver run.
 159  */
 160 int CtdlGetDynamicSymbol()
 161 {
 162         static unsigned int next_symbol = SYM_MAX;
 163         return ++next_symbol;
 164 }
 165
 166
 167
 168 /*
 169  * Return a pointer to some generic per-session user data.
 170  * (This function returns NULL if the requested symbol is not allocated.)
 171  *
 172  * NOTE: we use critical sections for allocating and de-allocating these,
 173  *       but not for locating one.
 174  */
 175 void *CtdlGetUserData(unsigned long requested_sym)
 176 {
 177         struct CtdlSessData *ptr;
 178
 179         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 180                 if (ptr->sym_id == requested_sym)
 181                         return(ptr->sym_data);
 182
 183         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 184                 requested_sym);
 185         return NULL;
 186 }
 187
 188
 189 /*
 190  * Allocate some generic per-session user data.
 191  */
 192 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 193 {
 194         struct CtdlSessData *ptr;
 195
 196         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 197
 198         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 199                 if (ptr->sym_id == requested_sym) {
 200                         lprintf(2, "ERROR: CtdlAllocUserData() requested for"
 201                                 " symbol id %ld already registered\n",
 202                                 requested_sym);
 203                         return;
 204                 }
 205         }
 206
 207         ptr = mallok(sizeof(struct CtdlSessData));
 208         ptr->sym_id = requested_sym;
 209         ptr->sym_data = mallok(num_bytes);
 210
 211         begin_critical_section(S_SESSION_TABLE);
 212         ptr->next = CC->FirstSessData;
 213         CC->FirstSessData = ptr;
 214         end_critical_section(S_SESSION_TABLE);
 215
 216         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 217 }
 218
 219
 220
 221
 222
 223 /*
 224  * set_wtmpsupp()  -  alter the session listing
 225  */
 226 void set_wtmpsupp(char *newtext)
 227 {
 228         strncpy(CC->cs_room,newtext,sizeof CC->cs_room);
 229         CC->cs_room[sizeof CC->cs_room - 1] = 0;
 230         time(&CC->cs_lastupdt);
 231
 232         /* Run any routines registered by loadable modules */
 233         PerformSessionHooks(EVT_NEWROOM);
 234         }
 235
 236
 237 /*
 238  * call set_wtmpsupp() with the name of the current room, modified a bit...
 239  */
 240 void set_wtmpsupp_to_current_room() {
 241         if (CC->quickroom.QRflags & QR_PRIVATE) {
 242                 set_wtmpsupp("<private room>");
 243                 }
 244         else if (CC->quickroom.QRflags & QR_MAILBOX) {
 245                 set_wtmpsupp(&CC->quickroom.QRname[11]);
 246                 }
 247         else {
 248                 set_wtmpsupp(CC->quickroom.QRname);
 249                 }
 250         }
 251
 252
 253
 254 /*
 255  * cmd_info()  -  tell the client about this server
 256  */
 257 void cmd_info(void) {
 258         cprintf("%d Server info:\n",LISTING_FOLLOWS);
 259         cprintf("%d\n",CC->cs_pid);
 260         cprintf("%s\n",config.c_nodename);
 261         cprintf("%s\n",config.c_humannode);
 262         cprintf("%s\n",config.c_fqdn);
 263         cprintf("%s\n",CITADEL);
 264         cprintf("%d\n",REV_LEVEL);
 265         cprintf("%s\n",config.c_bbs_city);
 266         cprintf("%s\n",config.c_sysadm);
 267         cprintf("%d\n",SERVER_TYPE);
 268         cprintf("%s\n",config.c_moreprompt);
 269         cprintf("1\n"); /* 1 = yes, this system supports floors */
 270         cprintf("1\n"); /* 1 = we support the extended paging options */
 271         cprintf("000\n");
 272         }
 273
 274 void cmd_rchg(char *argbuf)
 275 {
 276         char newroomname[256]; /* set to 256 to prevent buffer overruns <dme>*/
 277
 278         extract(newroomname, argbuf, 0);
 279         newroomname[ROOMNAMELEN] = 0;
 280         if (strlen(newroomname) > 0) {
 281                 strncpy(CC->fake_roomname, newroomname, ROOMNAMELEN);
 282                 CC->fake_roomname[ROOMNAMELEN - 1] = 0;
 283                 }
 284         else {
 285                 strcpy(CC->fake_roomname, "");
 286                 }
 287         cprintf("%d OK\n", OK);
 288 }
 289
 290 void cmd_hchg(char *newhostname)
 291 {
 292    if ((newhostname) && (newhostname[0]))
 293    {
 294       memset(CC->fake_hostname, 0, 25);
 295       strncpy(CC->fake_hostname, newhostname, 24);
 296    }
 297    else
 298       strcpy(CC->fake_hostname, "");
 299    cprintf("%d OK\n",OK);
 300 }
 301
 302 void cmd_uchg(char *newusername)
 303 {
 304    if (CC->usersupp.axlevel < 6)
 305    {
 306       cprintf("%d You must be an Aide to use UCHG.\n",
 307                 ERROR+HIGHER_ACCESS_REQUIRED);
 308       return;
 309    }
 310    if ((newusername) && (newusername[0]))
 311    {
 312       CC->cs_flags &= ~CS_STEALTH;
 313       memset(CC->fake_username, 0, 32);
 314       if (strncasecmp(newusername, CC->curr_user, strlen(CC->curr_user)))
 315          strncpy(CC->fake_username, newusername, 31);
 316    }
 317    else
 318    {
 319       CC->fake_username[0] = '\0';
 320       CC->cs_flags |= CS_STEALTH;
 321    }
 322    cprintf("%d\n",OK);
 323 }
 324
 325 /*
 326  * returns an asterisk if there are any express messages waiting,
 327  * space otherwise.
 328  */
 329 char check_express(void) {
 330         if (CC->FirstExpressMessage == NULL) {
 331                 return(' ');
 332                 }
 333         else {
 334                 return('*');
 335                 }
 336         }
 337
 338 void cmd_time(void)
 339 {
 340    time_t tv;
 341
 342    tv = time(NULL);
 343
 344    cprintf("%d %ld\n", OK, tv);
 345 }
 346
 347 /*
 348  * Check whether two hostnames match.
 349  * "Realname" should be an actual name of a client that is trying to connect;
 350  * "testname" should be the value we are comparing it with. The idea is that we
 351  * want to compare with both the abbreviated and fully-qualified versions of
 352  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 353  */
 354 static int hostnames_match(const char *realname, const char *testname) {
 355         struct hostent *he;
 356         int retval = 0;
 357
 358         if (!strcasecmp(realname, testname))
 359                 return 1;
 360
 361 #ifdef HAVE_NONREENTRANT_NETDB
 362         begin_critical_section(S_NETDB);
 363 #endif
 364
 365         if ((he = gethostbyname(testname)) != NULL)
 366                 if (!strcasecmp(realname, he->h_name))
 367                         retval = 1;
 368
 369 #ifdef HAVE_NONREENTRANT_NETDB
 370         end_critical_section(S_NETDB);
 371 #endif
 372
 373         return retval;
 374         }
 375
 376 /*
 377  * check a hostname against the public_clients file
 378  */
 379 int is_public_client(char *where)
 380 {
 381         char buf[256];
 382         FILE *fp;
 383
 384         if (hostnames_match(where,"localhost")) return(1);
 385         if (hostnames_match(where,config.c_fqdn)) return(1);
 386
 387         fp = fopen("public_clients","r");
 388         if (fp == NULL) return(0);
 389
 390         while (fgets(buf,256,fp)!=NULL) {
 391                 while (isspace((buf[strlen(buf)-1])))
 392                         buf[strlen(buf)-1] = 0;
 393                 if (hostnames_match(where,buf)) {
 394                         fclose(fp);
 395                         return(1);
 396                         }
 397                 }
 398
 399         fclose(fp);
 400         return(0);
 401         }
 402
 403
 404 /*
 405  * the client is identifying itself to the server
 406  */
 407 void cmd_iden(char *argbuf)
 408 {
 409         int dev_code;
 410         int cli_code;
 411         int rev_level;
 412         char desc[256];
 413         char from_host[256];
 414         struct in_addr addr;
 415
 416         if (num_parms(argbuf)<4) {
 417                 cprintf("%d usage error\n",ERROR);
 418                 return;
 419                 }
 420
 421         dev_code = extract_int(argbuf,0);
 422         cli_code = extract_int(argbuf,1);
 423         rev_level = extract_int(argbuf,2);
 424         extract(desc,argbuf,3);
 425
 426         strncpy(from_host,config.c_fqdn,sizeof from_host);
 427         from_host[sizeof from_host - 1] = 0;
 428         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 429
 430         CC->cs_clientdev = dev_code;
 431         CC->cs_clienttyp = cli_code;
 432         CC->cs_clientver = rev_level;
 433         strncpy(CC->cs_clientname,desc,31);
 434         CC->cs_clientname[31] = 0;
 435
 436         lprintf(9, "Looking up hostname\n");
 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
 447         lprintf(9, "Setting wtmpsupp\n");
 448         set_wtmpsupp_to_current_room();
 449
 450         syslog(LOG_NOTICE,"client %d/%d/%01d.%02d (%s)\n",
 451                 dev_code,
 452                 cli_code,
 453                 (rev_level / 100),
 454                 (rev_level % 100),
 455                 desc);
 456                 cprintf("%d Ok\n",OK);
 457         }
 458
 459
 460 /*
 461  * enter or exit "stealth mode"
 462  */
 463 void cmd_stel(char *cmdbuf)
 464 {
 465         int requested_mode;
 466
 467         requested_mode = extract_int(cmdbuf,0);
 468         if (requested_mode !=0) requested_mode = 1;
 469
 470         if (!CC->logged_in) {
 471                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 472                 return;
 473                 }
 474
 475         if (CC->usersupp.axlevel < 6) {
 476                 cprintf("%d You must be an Aide to use stealth mode.\n",
 477                         ERROR+HIGHER_ACCESS_REQUIRED);
 478                 return;
 479                 }
 480
 481         if (CC->cs_flags & CS_STEALTH) {
 482                 if (requested_mode == 0)
 483                         CC->cs_flags = CC->cs_flags-CS_STEALTH;
 484                 }
 485         else {
 486                 if (requested_mode == 1)
 487                         CC->cs_flags = CC->cs_flags|CS_STEALTH;
 488                 }
 489
 490         set_wtmpsupp_to_current_room();
 491         cprintf("%d Ok\n",OK);
 492         }
 493
 494
 495
 496
 497 /*
 498  * display system messages or help
 499  */
 500 void cmd_mesg(char *mname)
 501 {
 502         FILE *mfp;
 503         char targ[256];
 504         char buf[256];
 505         char *dirs[2];
 506
 507         extract(buf,mname,0);
 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
 519         if (strlen(targ)==0) {
 520                 cprintf("%d '%s' not found.\n",ERROR,mname);
 521                 return;
 522                 }
 523
 524         mfp = fopen(targ,"r");
 525         if (mfp==NULL) {
 526                 cprintf("%d Cannot open '%s': %s\n",
 527                         ERROR,targ,strerror(errno));
 528                 return;
 529                 }
 530         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 531
 532         while (fgets(buf,255,mfp)!=NULL) {
 533                 buf[strlen(buf)-1] = 0;
 534                 do_help_subst(buf);
 535                 cprintf("%s\n",buf);
 536                 }
 537
 538         fclose(mfp);
 539         cprintf("000\n");
 540         }
 541
 542
 543 /*
 544  * enter system messages or help
 545  */
 546 void cmd_emsg(char *mname)
 547 {
 548         FILE *mfp;
 549         char targ[256];
 550         char buf[256];
 551         char *dirs[2];
 552         int a;
 553
 554         if (CC->usersupp.axlevel < 6) {
 555                 cprintf("%d You must be an Aide to edit system messages.\n",
 556                         ERROR+HIGHER_ACCESS_REQUIRED);
 557                 return;
 558                 }
 559
 560         extract(buf,mname,0);
 561         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 562                 if (buf[a] == '/') buf[a] = '.';
 563                 }
 564
 565         dirs[0]=mallok(64);
 566         dirs[1]=mallok(64);
 567         strcpy(dirs[0],"messages");
 568         strcpy(dirs[1],"help");
 569         mesg_locate(targ,buf,2,dirs);
 570         phree(dirs[0]);
 571         phree(dirs[1]);
 572
 573         if (strlen(targ)==0) {
 574                 snprintf(targ, sizeof targ, "./help/%s", buf);
 575                 }
 576
 577         mfp = fopen(targ,"w");
 578         if (mfp==NULL) {
 579                 cprintf("%d Cannot open '%s': %s\n",
 580                         ERROR,targ,strerror(errno));
 581                 return;
 582                 }
 583         cprintf("%d %s\n", SEND_LISTING, targ);
 584
 585         while (client_gets(buf), strcmp(buf, "000")) {
 586                 fprintf(mfp, "%s\n", buf);
 587                 }
 588
 589         fclose(mfp);
 590         }
 591
 592
 593 /*
 594  * who's online
 595  */
 596 void cmd_rwho(void) {
 597         struct CitContext *cptr;
 598         int spoofed = 0;
 599         int aide;
 600         char un[40], room[40], host[40], flags[5];
 601
 602         aide = CC->usersupp.axlevel >= 6;
 603         cprintf("%d%c \n", LISTING_FOLLOWS, check_express() );
 604
 605         for (cptr = ContextList; cptr != NULL; cptr = cptr->next)
 606         {
 607                 flags[0] = '\0';
 608                 spoofed = 0;
 609
 610                 if (cptr->cs_flags & CS_POSTING)
 611                    strcat(flags, "*");
 612                 else
 613                    strcat(flags, ".");
 614
 615                 if (cptr->fake_username[0])
 616                 {
 617                    strcpy(un, cptr->fake_username);
 618                    spoofed = 1;
 619                 }
 620                 else
 621                    strcpy(un, cptr->curr_user);
 622
 623                 if (cptr->fake_hostname[0])
 624                 {
 625                    strcpy(host, cptr->fake_hostname);
 626                    spoofed = 1;
 627                 }
 628                 else
 629                    strcpy(host, cptr->cs_host);
 630
 631                 if (cptr->fake_roomname[0])
 632                 {
 633                    strcpy(room, cptr->fake_roomname);
 634                    spoofed = 1;
 635                 }
 636                 else
 637                    strcpy(room, cptr->cs_room);
 638
 639
 640                 if ((aide) && (spoofed))
 641                    strcat(flags, "+");
 642
 643                 if ((cptr->cs_flags & CS_STEALTH) && (aide))
 644                    strcat(flags, "-");
 645
 646                 if (((cptr->cs_flags&CS_STEALTH)==0) || (aide))
 647                 {
 648                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 649                                 cptr->cs_pid, un, room,
 650                                 host, cptr->cs_clientname,
 651                                 (long)(cptr->lastidle),
 652                                 cptr->lastcmdname, flags);
 653                 }
 654                 if ((spoofed) && (aide))
 655                 {
 656                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 657                                 cptr->cs_pid, cptr->curr_user, cptr->cs_room,
 658                                 cptr->cs_host, cptr->cs_clientname,
 659                                 (long)(cptr->lastidle),
 660                                 cptr->lastcmdname, flags);
 661
 662                 }
 663         }
 664
 665         /* Now it's magic time.  Before we finish, call any EVT_RWHO hooks
 666          * so that external paging modules such as serv_icq can add more
 667          * content to the Wholist.
 668          */
 669         PerformSessionHooks(EVT_RWHO);
 670         cprintf("000\n");
 671         }
 672
 673
 674 /*
 675  * Terminate another running session
 676  */
 677 void cmd_term(char *cmdbuf)
 678 {
 679         int session_num;
 680         struct CitContext *ccptr;
 681         int session_to_kill = 0;
 682
 683         if (!CC->logged_in) {
 684                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 685                 return;
 686                 }
 687
 688         if (CC->usersupp.axlevel < 6) {
 689                 cprintf("%d You must be an Aide to terminate sessions.\n",
 690                         ERROR+HIGHER_ACCESS_REQUIRED);
 691                 return;
 692                 }
 693
 694         session_num = extract_int(cmdbuf, 0);
 695         if (session_num == CC->cs_pid) {
 696                 cprintf("%d You can't kill your own session.\n", ERROR);
 697                 return;
 698                 }
 699
 700         lprintf(9, "Locating session to kill\n");
 701         begin_critical_section(S_SESSION_TABLE);
 702         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 703                 if (session_num == ccptr->cs_pid) {
 704                         session_to_kill = ccptr->cs_pid;
 705                         }
 706                 }
 707         end_critical_section(S_SESSION_TABLE);
 708         lprintf(9, "session_to_kill == %d\n", session_to_kill);
 709
 710         if (session_to_kill > 0) {
 711                 lprintf(9, "calling kill_session()\n");
 712                 kill_session(session_to_kill);
 713                 cprintf("%d Session terminated.\n", OK);
 714                 }
 715         else {
 716                 cprintf("%d No such session.\n", ERROR);
 717                 }
 718         }
 719
 720
 721
 722
 723
 724 /*
 725  * get the paginator prompt
 726  */
 727 void cmd_more(void) {
 728         cprintf("%d %s\n",OK,config.c_moreprompt);
 729         }
 730
 731 /*
 732  * echo
 733  */
 734 void cmd_echo(char *etext)
 735 {
 736         cprintf("%d %s\n",OK,etext);
 737         }
 738
 739
 740
 741 /*
 742  * identify as internal program
 743  */
 744 void cmd_ipgm(char *argbuf)
 745 {
 746         int secret;
 747
 748         secret = extract_int(argbuf, 0);
 749         if (secret == config.c_ipgm_secret) {
 750                 CC->internal_pgm = 1;
 751                 strcpy(CC->curr_user, "<internal program>");
 752                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 753                 cprintf("%d Authenticated as an internal program.\n",OK);
 754                 }
 755         else {
 756                 cprintf("%d Authentication failed.\n",ERROR);
 757                 }
 758         }
 759
 760
 761 /*
 762  * Shut down the server
 763  */
 764 void cmd_down(void) {
 765         if (!CC->logged_in) {
 766                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 767                 return;
 768                 }
 769
 770         if (CC->usersupp.axlevel < 6) {
 771                 cprintf("%d You must be an Aide to shut down the server.\n",
 772                         ERROR+HIGHER_ACCESS_REQUIRED);
 773                 return;
 774                 }
 775
 776         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 777         master_cleanup();
 778         }
 779
 780 /*
 781  * Schedule or cancel a server shutdown
 782  */
 783 void cmd_scdn(char *argbuf)
 784 {
 785         int new_state;
 786
 787         if (!CC->logged_in) {
 788                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 789                 return;
 790                 }
 791
 792         if (CC->usersupp.axlevel < 6) {
 793                 cprintf("%d You must be an Aide to schedule a shutdown.\n",
 794                         ERROR+HIGHER_ACCESS_REQUIRED);
 795                 return;
 796                 }
 797
 798         new_state = extract_int(argbuf, 0);
 799         if ((new_state == 0) || (new_state == 1)) {
 800                 ScheduledShutdown = new_state;
 801                 }
 802         cprintf("%d %d\n", OK, ScheduledShutdown);
 803         }
 804
 805
 806 /*
 807  * main context loop
 808  */
 809 void *context_loop(struct CitContext *con)
 810 {
 811         char cmdbuf[256];
 812         int num_sessions, len;
 813         struct sockaddr_in sin;
 814
 815         /*
 816          * Wedge our way into the context table.
 817          */
 818         InitMyContext(con);
 819
 820         /*
 821          * Initialize some variables specific to our context.
 822          */
 823         CC->logged_in = 0;
 824         CC->internal_pgm = 0;
 825         CC->download_fp = NULL;
 826         CC->upload_fp = NULL;
 827         CC->cs_pid = con->client_socket;        /* not necessarily portable */
 828         CC->FirstExpressMessage = NULL;
 829         time(&CC->lastcmd);
 830         time(&CC->lastidle);
 831         strcpy(CC->lastcmdname, "    ");
 832         strcpy(CC->cs_clientname, "(unknown)");
 833         strcpy(CC->curr_user,"(not logged in)");
 834         strcpy(CC->net_node,"");
 835         snprintf(CC->temp, sizeof CC->temp, tmpnam(NULL));
 836         strcpy(CC->cs_room, "(no room)");
 837         strncpy(CC->cs_host, config.c_fqdn, sizeof CC->cs_host);
 838         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 839         len = sizeof sin;
 840         if (!getpeername(CC->client_socket, (struct sockaddr *) &sin, &len))
 841                 locate_host(CC->cs_host, &sin.sin_addr);
 842         CC->cs_flags = 0;
 843         CC->upload_type = UPL_FILE;
 844         CC->dl_is_net = 0;
 845         CC->FirstSessData = NULL;
 846
 847         num_sessions = session_count();
 848         CC->nologin = 0;
 849         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 850                 CC->nologin = 1;
 851
 852         if (CC->nologin==1) {
 853            cprintf("%d %s: Too many users are already online (maximum is %d)\n",
 854                 ERROR+MAX_SESSIONS_EXCEEDED,
 855                 config.c_nodename,config.c_maxsessions);
 856                 }
 857         else {
 858            cprintf("%d %s Citadel/UX server ready.\n",OK,config.c_nodename);
 859                 }
 860
 861         lprintf(3, "citserver[%3d]: started.\n", CC->cs_pid);
 862
 863         /* Run any session startup routines registered by loadable modules */
 864         PerformSessionHooks(EVT_START);
 865
 866         rec_log(CL_CONNECT, "");
 867
 868         do {
 869                 time(&CC->lastcmd);
 870                 memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 871                 if (client_gets(cmdbuf) < 1) cleanup(EXIT_NULL);
 872                 lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 873
 874                 /*
 875                  * Let other clients see the last command we executed, and
 876                  * update the idle time, but not NOOP, PEXP, or GEXP.
 877                  */
 878                 if ( (strncasecmp(cmdbuf, "NOOP", 4))
 879                    && (strncasecmp(cmdbuf, "PEXP", 4))
 880                    && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 881                         strcpy(CC->lastcmdname, "    ");
 882                         strncpy(CC->lastcmdname, cmdbuf, 4);
 883                         time(&CC->lastidle);
 884                         }
 885
 886                 if ((strncasecmp(cmdbuf, "ENT0", 4)) && (strncasecmp(cmdbuf, "MESG", 4)) && (strncasecmp(cmdbuf, "MSGS", 4)))
 887                 {
 888                    CC->cs_flags &= ~CS_POSTING;
 889                 }
 890
 891 /*
 892  * This loop recognizes all server commands.
 893  */
 894
 895                 if (!strncasecmp(cmdbuf,"NOOP",4)) {
 896                         cprintf("%d%cok\n",OK,check_express());
 897                         }
 898
 899                 else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 900                         cprintf("%d Goodbye.\n",OK);
 901                         }
 902
 903                 else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 904                         if (CC->logged_in) logout(CC);
 905                         cprintf("%d logged out.\n",OK);
 906                         }
 907
 908                 else if (!strncasecmp(cmdbuf,"USER",4)) {
 909                         cmd_user(&cmdbuf[5]);
 910                         }
 911
 912                 else if (!strncasecmp(cmdbuf,"PASS",4)) {
 913                         cmd_pass(&cmdbuf[5]);
 914                         }
 915
 916                 else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 917                         cmd_newu(&cmdbuf[5]);
 918                         }
 919
 920                 else if (!strncasecmp(cmdbuf,"SETP",4)) {
 921                         cmd_setp(&cmdbuf[5]);
 922                         }
 923
 924                 else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 925                         cmd_lrms(&cmdbuf[5]);
 926                         }
 927
 928                 else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 929                         cmd_lkra(&cmdbuf[5]);
 930                         }
 931
 932                 else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 933                         cmd_lkrn(&cmdbuf[5]);
 934                         }
 935
 936                 else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 937                         cmd_lkro(&cmdbuf[5]);
 938                         }
 939
 940                 else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 941                         cmd_lzrm(&cmdbuf[5]);
 942                         }
 943
 944                 else if (!strncasecmp(cmdbuf,"GETU",4)) {
 945                         cmd_getu();
 946                         }
 947
 948                 else if (!strncasecmp(cmdbuf,"SETU",4)) {
 949                         cmd_setu(&cmdbuf[5]);
 950                         }
 951
 952                 else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 953                         cmd_goto(&cmdbuf[5]);
 954                         }
 955
 956                 else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 957                         cmd_msgs(&cmdbuf[5]);
 958                         }
 959
 960                 else if (!strncasecmp(cmdbuf,"WHOK",4)) {
 961                         cmd_whok();
 962                         }
 963
 964                 else if (!strncasecmp(cmdbuf,"RDIR",4)) {
 965                         cmd_rdir();
 966                         }
 967
 968                 else if (!strncasecmp(cmdbuf,"MSG0",4)) {
 969                         cmd_msg0(&cmdbuf[5]);
 970                         }
 971
 972                 else if (!strncasecmp(cmdbuf,"MSG2",4)) {
 973                         cmd_msg2(&cmdbuf[5]);
 974                         }
 975
 976                 else if (!strncasecmp(cmdbuf,"MSG3",4)) {
 977                         cmd_msg3(&cmdbuf[5]);
 978                         }
 979
 980                 else if (!strncasecmp(cmdbuf,"MSG4",4)) {
 981                         cmd_msg4(&cmdbuf[5]);
 982                         }
 983
 984                 else if (!strncasecmp(cmdbuf,"OPNA",4)) {
 985                         cmd_opna(&cmdbuf[5]);
 986                         }
 987
 988                 else if (!strncasecmp(cmdbuf,"INFO",4)) {
 989                         cmd_info();
 990                         }
 991
 992                 else if (!strncasecmp(cmdbuf,"SLRP",4)) {
 993                         cmd_slrp(&cmdbuf[5]);
 994                         }
 995
 996                 else if (!strncasecmp(cmdbuf,"INVT",4)) {
 997                         cmd_invt_kick(&cmdbuf[5],1);
 998                         }
 999
1000                 else if (!strncasecmp(cmdbuf,"KICK",4)) {
1001                         cmd_invt_kick(&cmdbuf[5],0);
1002                         }
1003
1004                 else if (!strncasecmp(cmdbuf,"GETR",4)) {
1005                         cmd_getr();
1006                         }
1007
1008                 else if (!strncasecmp(cmdbuf,"SETR",4)) {
1009                         cmd_setr(&cmdbuf[5]);
1010                         }
1011
1012                 else if (!strncasecmp(cmdbuf,"GETA",4)) {
1013                         cmd_geta();
1014                         }
1015
1016                 else if (!strncasecmp(cmdbuf,"SETA",4)) {
1017                         cmd_seta(&cmdbuf[5]);
1018                         }
1019
1020                 else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1021                         cmd_ent0(&cmdbuf[5]);
1022                         }
1023
1024                 else if (!strncasecmp(cmdbuf,"ENT3",4)) {
1025                         cmd_ent3(&cmdbuf[5]);
1026                         }
1027
1028                 else if (!strncasecmp(cmdbuf,"RINF",4)) {
1029                         cmd_rinf();
1030                         }
1031
1032                 else if (!strncasecmp(cmdbuf,"DELE",4)) {
1033                         cmd_dele(&cmdbuf[5]);
1034                         }
1035
1036                 else if (!strncasecmp(cmdbuf,"KILL",4)) {
1037                         cmd_kill(&cmdbuf[5]);
1038                         }
1039
1040                 else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1041                         cmd_cre8(&cmdbuf[5]);
1042                         }
1043
1044                 else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1045                         cmd_move(&cmdbuf[5]);
1046                         }
1047
1048                 else if (!strncasecmp(cmdbuf,"FORG",4)) {
1049                         cmd_forg();
1050                         }
1051
1052                 else if (!strncasecmp(cmdbuf,"MESG",4)) {
1053                         cmd_mesg(&cmdbuf[5]);
1054                         }
1055
1056                 else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1057                         cmd_emsg(&cmdbuf[5]);
1058                         }
1059
1060                 else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1061                         cmd_gnur();
1062                         }
1063
1064                 else if (!strncasecmp(cmdbuf,"GREG",4)) {
1065                         cmd_greg(&cmdbuf[5]);
1066                         }
1067
1068                 else if (!strncasecmp(cmdbuf,"VALI",4)) {
1069                         cmd_vali(&cmdbuf[5]);
1070                         }
1071
1072                 else if (!strncasecmp(cmdbuf,"EINF",4)) {
1073                         cmd_einf(&cmdbuf[5]);
1074                         }
1075
1076                 else if (!strncasecmp(cmdbuf,"LIST",4)) {
1077                         cmd_list();
1078                         }
1079
1080                 else if (!strncasecmp(cmdbuf,"REGI",4)) {
1081                         cmd_regi();
1082                         }
1083
1084                 else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1085                         cmd_chek();
1086                         }
1087
1088                 else if (!strncasecmp(cmdbuf,"DELF",4)) {
1089                         cmd_delf(&cmdbuf[5]);
1090                         }
1091
1092                 else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1093                         cmd_movf(&cmdbuf[5]);
1094                         }
1095
1096                 else if (!strncasecmp(cmdbuf,"NETF",4)) {
1097                         cmd_netf(&cmdbuf[5]);
1098                         }
1099
1100                 else if (!strncasecmp(cmdbuf,"RWHO",4)) {
1101                         cmd_rwho();
1102                         }
1103
1104                 else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1105                         cmd_open(&cmdbuf[5]);
1106                         }
1107
1108                 else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1109                         cmd_clos();
1110                         }
1111
1112                 else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1113                         cmd_uopn(&cmdbuf[5]);
1114                         }
1115
1116                 else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1117                         cmd_ucls(&cmdbuf[5]);
1118                         }
1119
1120                 else if (!strncasecmp(cmdbuf,"READ",4)) {
1121                         cmd_read(&cmdbuf[5]);
1122                         }
1123
1124                 else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1125                         cmd_writ(&cmdbuf[5]);
1126                         }
1127
1128                 else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1129                         cmd_qusr(&cmdbuf[5]);
1130                         }
1131
1132                 else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1133                         cmd_echo(&cmdbuf[5]);
1134                         }
1135
1136                 else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1137                         cmd_oimg(&cmdbuf[5]);
1138                         }
1139
1140                 else if (!strncasecmp(cmdbuf,"MORE",4)) {
1141                         cmd_more();
1142                         }
1143
1144                 else if (!strncasecmp(cmdbuf,"NETP",4)) {
1145                         cmd_netp(&cmdbuf[5]);
1146                         }
1147
1148                 else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1149                         cmd_ndop(&cmdbuf[5]);
1150                         }
1151
1152                 else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1153                         cmd_nuop(&cmdbuf[5]);
1154                         }
1155
1156                 else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1157                         cmd_lflr();
1158                         }
1159
1160                 else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1161                         cmd_cflr(&cmdbuf[5]);
1162                         }
1163
1164                 else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1165                         cmd_kflr(&cmdbuf[5]);
1166                         }
1167
1168                 else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1169                         cmd_eflr(&cmdbuf[5]);
1170                         }
1171
1172                 else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1173                         cmd_iden(&cmdbuf[5]);
1174                         }
1175
1176                 else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1177                         cmd_ipgm(&cmdbuf[5]);
1178                         }
1179
1180                 else if (!strncasecmp(cmdbuf,"EBIO",4)) {
1181                         cmd_ebio();
1182                         }
1183
1184                 else if (!strncasecmp(cmdbuf,"RBIO",4)) {
1185                         cmd_rbio(&cmdbuf[5]);
1186                         }
1187
1188                 else if (!strncasecmp(cmdbuf,"LBIO",4)) {
1189                         cmd_lbio();
1190                         }
1191
1192                 else if (!strncasecmp(cmdbuf,"STEL",4)) {
1193                         cmd_stel(&cmdbuf[5]);
1194                         }
1195
1196                 else if (!strncasecmp(cmdbuf,"TERM",4)) {
1197                         cmd_term(&cmdbuf[5]);
1198                         }
1199
1200                 else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1201                         cmd_down();
1202                         }
1203
1204                 else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1205                         cmd_scdn(&cmdbuf[5]);
1206                         }
1207
1208                 else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1209                         cmd_nset(&cmdbuf[5]);
1210                         }
1211
1212                 else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1213                         cmd_uimg(&cmdbuf[5]);
1214                         }
1215
1216                 else if (!strncasecmp(cmdbuf, "UCHG", 4)) {
1217                         cmd_uchg(&cmdbuf[5]);
1218                         }
1219
1220                 else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1221                         cmd_time();
1222                         }
1223
1224                 else if (!strncasecmp(cmdbuf, "HCHG", 4)) {
1225                         cmd_hchg(&cmdbuf[5]);
1226                         }
1227
1228                 else if (!strncasecmp(cmdbuf, "RCHG", 4)) {
1229                         cmd_rchg(&cmdbuf[5]);
1230                         }
1231
1232                 else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1233                         cmd_agup(&cmdbuf[5]);
1234                         }
1235
1236                 else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1237                         cmd_asup(&cmdbuf[5]);
1238                         }
1239
1240                 else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1241                         cmd_gpex(&cmdbuf[5]);
1242                         }
1243
1244                 else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1245                         cmd_spex(&cmdbuf[5]);
1246                         }
1247
1248                 else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1249                         cmd_conf(&cmdbuf[5]);
1250                         }
1251
1252 #ifdef DEBUG_MEMORY_LEAKS
1253                 else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1254                         dump_tracked();
1255                         }
1256 #endif
1257
1258                 else if (!DLoader_Exec_Cmd(cmdbuf))
1259                         {
1260                            cprintf("%d Unrecognized or unsupported command.\n",
1261                                     ERROR);
1262                         }
1263
1264                 /* Run any after-each-command outines registered by modules */
1265                 PerformSessionHooks(EVT_CMD);
1266
1267                 } while(strncasecmp(cmdbuf, "QUIT", 4));
1268
1269         cleanup(EXIT_NORMAL);
1270         return(NULL);
1271         }