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 "msgbase.h"
  32 #include "support.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         lprintf(9, "cleanup_stuff() called\n");
 128
 129         lprintf(7, "Calling logout(%d)\n", CC->cs_pid);
 130         logout(CC);
 131
 132         rec_log(CL_TERMINATE,CC->curr_user);
 133         unlink(CC->temp);
 134         lprintf(3, "citserver[%3d]: ended.\n",CC->cs_pid);
 135
 136         /* Run any cleanup routines registered by loadable modules */
 137         PerformSessionHooks(EVT_STOP);
 138
 139         syslog(LOG_NOTICE,"session %d ended", CC->cs_pid);
 140
 141         /* Deallocate any user-data attached to this session */
 142         deallocate_user_data(CC);
 143
 144         /* Tell the housekeeping thread to remove the session and context.
 145          * This can't be done inline because the context data gets destroyed
 146          * halfway through, and the context being destroyed can't be the one
 147          * doing the work.
 148          */
 149         lprintf(7, "Calling RemoveContext(%d)\n", CC->cs_pid);
 150         RemoveContext(CC->cs_pid);
 151         }
 152
 153
 154 /*
 155  * Get a dynamic symbol number for per-session user data.
 156  * This API call should be made only ONCE per symbol per citserver run.
 157  */
 158 int CtdlGetDynamicSymbol()
 159 {
 160         static unsigned int next_symbol = SYM_MAX;
 161         return ++next_symbol;
 162 }
 163
 164
 165
 166 /*
 167  * Return a pointer to some generic per-session user data.
 168  * (This function returns NULL if the requested symbol is not allocated.)
 169  *
 170  * NOTE: we use critical sections for allocating and de-allocating these,
 171  *       but not for locating one.
 172  */
 173 void *CtdlGetUserData(unsigned long requested_sym)
 174 {
 175         struct CtdlSessData *ptr;
 176
 177         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 178                 if (ptr->sym_id == requested_sym)
 179                         return(ptr->sym_data);
 180
 181         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 182                 requested_sym);
 183         return NULL;
 184 }
 185
 186
 187 /*
 188  * Allocate some generic per-session user data.
 189  */
 190 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 191 {
 192         struct CtdlSessData *ptr;
 193
 194         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 195
 196         /* Fail silently if the symbol is already registered. */
 197         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 198                 if (ptr->sym_id == requested_sym) {
 199                         return;
 200                 }
 201         }
 202
 203         /* Grab us some memory!  Dem's good eatin' !!  */
 204         ptr = mallok(sizeof(struct CtdlSessData));
 205         ptr->sym_id = requested_sym;
 206         ptr->sym_data = mallok(num_bytes);
 207
 208         begin_critical_section(S_SESSION_TABLE);
 209         ptr->next = CC->FirstSessData;
 210         CC->FirstSessData = ptr;
 211         end_critical_section(S_SESSION_TABLE);
 212
 213         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 214 }
 215
 216
 217
 218
 219
 220
 221 /*
 222  * cmd_info()  -  tell the client about this server
 223  */
 224 void cmd_info(void) {
 225         cprintf("%d Server info:\n",LISTING_FOLLOWS);
 226         cprintf("%d\n",CC->cs_pid);
 227         cprintf("%s\n",config.c_nodename);
 228         cprintf("%s\n",config.c_humannode);
 229         cprintf("%s\n",config.c_fqdn);
 230         cprintf("%s\n",CITADEL);
 231         cprintf("%d\n",REV_LEVEL);
 232         cprintf("%s\n",config.c_bbs_city);
 233         cprintf("%s\n",config.c_sysadm);
 234         cprintf("%d\n",SERVER_TYPE);
 235         cprintf("%s\n",config.c_moreprompt);
 236         cprintf("1\n"); /* 1 = yes, this system supports floors */
 237         cprintf("1\n"); /* 1 = we support the extended paging options */
 238         cprintf("000\n");
 239         }
 240
 241 void cmd_rchg(char *argbuf)
 242 {
 243         char newroomname[ROOMNAMELEN];
 244
 245         extract(newroomname, argbuf, 0);
 246         newroomname[ROOMNAMELEN] = 0;
 247         if (strlen(newroomname) > 0) {
 248                 safestrncpy(CC->fake_roomname, newroomname,
 249                         sizeof(CC->fake_roomname) );
 250                 CC->fake_roomname[ROOMNAMELEN - 1] = 0;
 251                 }
 252         else {
 253                 strcpy(CC->fake_roomname, "");
 254                 }
 255         cprintf("%d OK\n", OK);
 256 }
 257
 258 void cmd_hchg(char *newhostname)
 259 {
 260    if ((newhostname) && (newhostname[0]))
 261    {
 262       memset(CC->fake_hostname, 0, 25);
 263       safestrncpy(CC->fake_hostname, newhostname, sizeof(CC->fake_hostname));
 264    }
 265    else
 266       strcpy(CC->fake_hostname, "");
 267    cprintf("%d OK\n",OK);
 268 }
 269
 270 void cmd_uchg(char *newusername)
 271 {
 272    if (CC->usersupp.axlevel < 6)
 273    {
 274       cprintf("%d You must be an Aide to use UCHG.\n",
 275                 ERROR+HIGHER_ACCESS_REQUIRED);
 276       return;
 277    }
 278    if ((newusername) && (newusername[0]))
 279    {
 280       CC->cs_flags &= ~CS_STEALTH;
 281       memset(CC->fake_username, 0, 32);
 282       if (strncasecmp(newusername, CC->curr_user, strlen(CC->curr_user)))
 283          safestrncpy(CC->fake_username, newusername, sizeof(CC->fake_username));
 284    }
 285    else
 286    {
 287       CC->fake_username[0] = '\0';
 288       CC->cs_flags |= CS_STEALTH;
 289    }
 290    cprintf("%d\n",OK);
 291 }
 292
 293 /*
 294  * returns an asterisk if there are any express messages waiting,
 295  * space otherwise.
 296  */
 297 char check_express(void) {
 298         if (CC->FirstExpressMessage == NULL) {
 299                 return(' ');
 300                 }
 301         else {
 302                 return('*');
 303                 }
 304         }
 305
 306 void cmd_time(void)
 307 {
 308    time_t tv;
 309
 310    tv = time(NULL);
 311
 312    cprintf("%d %ld\n", OK, tv);
 313 }
 314
 315 /*
 316  * Check whether two hostnames match.
 317  * "Realname" should be an actual name of a client that is trying to connect;
 318  * "testname" should be the value we are comparing it with. The idea is that we
 319  * want to compare with both the abbreviated and fully-qualified versions of
 320  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 321  */
 322 static int hostnames_match(const char *realname, const char *testname) {
 323         struct hostent *he;
 324         int retval = 0;
 325
 326         if (!strcasecmp(realname, testname))
 327                 return 1;
 328
 329 #ifdef HAVE_NONREENTRANT_NETDB
 330         begin_critical_section(S_NETDB);
 331 #endif
 332
 333         if ((he = gethostbyname(testname)) != NULL)
 334                 if (!strcasecmp(realname, he->h_name))
 335                         retval = 1;
 336
 337 #ifdef HAVE_NONREENTRANT_NETDB
 338         end_critical_section(S_NETDB);
 339 #endif
 340
 341         return retval;
 342         }
 343
 344 /*
 345  * check a hostname against the public_clients file
 346  */
 347 int is_public_client(char *where)
 348 {
 349         char buf[256];
 350         FILE *fp;
 351
 352         if (hostnames_match(where,"localhost")) return(1);
 353         if (hostnames_match(where,config.c_fqdn)) return(1);
 354
 355         fp = fopen("public_clients","r");
 356         if (fp == NULL) return(0);
 357
 358         while (fgets(buf,256,fp)!=NULL) {
 359                 while (isspace((buf[strlen(buf)-1])))
 360                         buf[strlen(buf)-1] = 0;
 361                 if (hostnames_match(where,buf)) {
 362                         fclose(fp);
 363                         return(1);
 364                         }
 365                 }
 366
 367         fclose(fp);
 368         return(0);
 369         }
 370
 371
 372 /*
 373  * the client is identifying itself to the server
 374  */
 375 void cmd_iden(char *argbuf)
 376 {
 377         int dev_code;
 378         int cli_code;
 379         int rev_level;
 380         char desc[256];
 381         char from_host[256];
 382         struct in_addr addr;
 383
 384         if (num_parms(argbuf)<4) {
 385                 cprintf("%d usage error\n",ERROR);
 386                 return;
 387                 }
 388
 389         dev_code = extract_int(argbuf,0);
 390         cli_code = extract_int(argbuf,1);
 391         rev_level = extract_int(argbuf,2);
 392         extract(desc,argbuf,3);
 393
 394         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 395         from_host[sizeof from_host - 1] = 0;
 396         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 397
 398         CC->cs_clientdev = dev_code;
 399         CC->cs_clienttyp = cli_code;
 400         CC->cs_clientver = rev_level;
 401         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 402         CC->cs_clientname[31] = 0;
 403
 404         lprintf(9, "Looking up hostname\n");
 405         if ((strlen(from_host)>0) &&
 406            (is_public_client(CC->cs_host))) {
 407                 if (inet_aton(from_host, &addr))
 408                         locate_host(CC->cs_host, &addr);
 409                 else {
 410                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 411                         CC->cs_host[24] = 0;
 412                         }
 413                 }
 414
 415         syslog(LOG_NOTICE,"client %d/%d/%01d.%02d (%s)\n",
 416                 dev_code,
 417                 cli_code,
 418                 (rev_level / 100),
 419                 (rev_level % 100),
 420                 desc);
 421                 cprintf("%d Ok\n",OK);
 422         }
 423
 424
 425 /*
 426  * enter or exit "stealth mode"
 427  */
 428 void cmd_stel(char *cmdbuf)
 429 {
 430         int requested_mode;
 431
 432         requested_mode = extract_int(cmdbuf,0);
 433         if (requested_mode !=0) requested_mode = 1;
 434
 435         if (!CC->logged_in) {
 436                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 437                 return;
 438                 }
 439
 440         if (CC->usersupp.axlevel < 6) {
 441                 cprintf("%d You must be an Aide to use stealth mode.\n",
 442                         ERROR+HIGHER_ACCESS_REQUIRED);
 443                 return;
 444                 }
 445
 446         if (CC->cs_flags & CS_STEALTH) {
 447                 if (requested_mode == 0)
 448                         CC->cs_flags = CC->cs_flags-CS_STEALTH;
 449                 }
 450         else {
 451                 if (requested_mode == 1)
 452                         CC->cs_flags = CC->cs_flags|CS_STEALTH;
 453                 }
 454
 455         cprintf("%d Ok\n",OK);
 456         }
 457
 458
 459
 460
 461 /*
 462  * display system messages or help
 463  */
 464 void cmd_mesg(char *mname)
 465 {
 466         FILE *mfp;
 467         char targ[256];
 468         char buf[256];
 469         char *dirs[2];
 470
 471         extract(buf,mname,0);
 472
 473
 474         dirs[0]=mallok(64);
 475         dirs[1]=mallok(64);
 476         strcpy(dirs[0],"messages");
 477         strcpy(dirs[1],"help");
 478         mesg_locate(targ,buf,2,dirs);
 479         phree(dirs[0]);
 480         phree(dirs[1]);
 481
 482
 483         if (strlen(targ)==0) {
 484                 cprintf("%d '%s' not found.\n",ERROR,mname);
 485                 return;
 486                 }
 487
 488         mfp = fopen(targ,"r");
 489         if (mfp==NULL) {
 490                 cprintf("%d Cannot open '%s': %s\n",
 491                         ERROR,targ,strerror(errno));
 492                 return;
 493                 }
 494         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 495
 496         while (fgets(buf,255,mfp)!=NULL) {
 497                 buf[strlen(buf)-1] = 0;
 498                 do_help_subst(buf);
 499                 cprintf("%s\n",buf);
 500                 }
 501
 502         fclose(mfp);
 503         cprintf("000\n");
 504         }
 505
 506
 507 /*
 508  * enter system messages or help
 509  */
 510 void cmd_emsg(char *mname)
 511 {
 512         FILE *mfp;
 513         char targ[256];
 514         char buf[256];
 515         char *dirs[2];
 516         int a;
 517
 518         if (CC->usersupp.axlevel < 6) {
 519                 cprintf("%d You must be an Aide to edit system messages.\n",
 520                         ERROR+HIGHER_ACCESS_REQUIRED);
 521                 return;
 522                 }
 523
 524         extract(buf,mname,0);
 525         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 526                 if (buf[a] == '/') buf[a] = '.';
 527                 }
 528
 529         dirs[0]=mallok(64);
 530         dirs[1]=mallok(64);
 531         strcpy(dirs[0],"messages");
 532         strcpy(dirs[1],"help");
 533         mesg_locate(targ,buf,2,dirs);
 534         phree(dirs[0]);
 535         phree(dirs[1]);
 536
 537         if (strlen(targ)==0) {
 538                 snprintf(targ, sizeof targ, "./help/%s", buf);
 539                 }
 540
 541         mfp = fopen(targ,"w");
 542         if (mfp==NULL) {
 543                 cprintf("%d Cannot open '%s': %s\n",
 544                         ERROR,targ,strerror(errno));
 545                 return;
 546                 }
 547         cprintf("%d %s\n", SEND_LISTING, targ);
 548
 549         while (client_gets(buf), strcmp(buf, "000")) {
 550                 fprintf(mfp, "%s\n", buf);
 551                 }
 552
 553         fclose(mfp);
 554         }
 555
 556
 557 /* Don't show the names of private rooms unless the viewing
 558  * user also knows the rooms.
 559  */
 560 void GenerateRoomDisplay(char *real_room,
 561                         struct CitContext *viewed,
 562                         struct CitContext *viewer) {
 563
 564         strcpy(real_room, viewed->quickroom.QRname);
 565         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 566                 strcpy(real_room, &real_room[11]);
 567         }
 568         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 569                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 570                    & UA_KNOWN) == 0) {
 571                         strcpy(real_room, "<private room>");
 572                 }
 573         }
 574
 575         if (viewed->cs_flags & CS_CHAT) {
 576                 while (strlen(real_room) < 14)
 577                         strcat(real_room, " ");
 578
 579                 strcpy(&real_room[14], "<chat>");
 580         }
 581
 582 }
 583
 584
 585 /*
 586  * who's online
 587  */
 588 void cmd_rwho(void) {
 589         struct CitContext *cptr;
 590         int spoofed = 0;
 591         int aide;
 592         char un[40];
 593         char real_room[ROOMNAMELEN], room[ROOMNAMELEN];
 594         char host[40], flags[5];
 595
 596         aide = CC->usersupp.axlevel >= 6;
 597         cprintf("%d%c \n", LISTING_FOLLOWS, check_express() );
 598
 599         for (cptr = ContextList; cptr != NULL; cptr = cptr->next)
 600         {
 601                 flags[0] = '\0';
 602                 spoofed = 0;
 603
 604                 if (cptr->cs_flags & CS_POSTING)
 605                    strcat(flags, "*");
 606                 else
 607                    strcat(flags, ".");
 608
 609                 if (cptr->fake_username[0])
 610                 {
 611                    strcpy(un, cptr->fake_username);
 612                    spoofed = 1;
 613                 }
 614                 else
 615                    strcpy(un, cptr->curr_user);
 616
 617                 if (cptr->fake_hostname[0])
 618                 {
 619                    strcpy(host, cptr->fake_hostname);
 620                    spoofed = 1;
 621                 }
 622                 else
 623                    strcpy(host, cptr->cs_host);
 624
 625                 GenerateRoomDisplay(real_room, cptr, CC);
 626
 627                 if (cptr->fake_roomname[0]) {
 628                         strcpy(room, cptr->fake_roomname);
 629                         spoofed = 1;
 630                 }
 631                 else {
 632                         strcpy(room, real_room);
 633                 }
 634
 635                 if ((aide) && (spoofed))
 636                    strcat(flags, "+");
 637
 638                 if ((cptr->cs_flags & CS_STEALTH) && (aide))
 639                    strcat(flags, "-");
 640
 641                 if (((cptr->cs_flags&CS_STEALTH)==0) || (aide))
 642                 {
 643                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 644                                 cptr->cs_pid, un, room,
 645                                 host, cptr->cs_clientname,
 646                                 (long)(cptr->lastidle),
 647                                 cptr->lastcmdname, flags);
 648                 }
 649                 if ((spoofed) && (aide))
 650                 {
 651                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 652                                 cptr->cs_pid, cptr->curr_user,
 653                                 real_room,
 654                                 cptr->cs_host, cptr->cs_clientname,
 655                                 (long)(cptr->lastidle),
 656                                 cptr->lastcmdname, flags);
 657
 658                 }
 659         }
 660
 661         /* Now it's magic time.  Before we finish, call any EVT_RWHO hooks
 662          * so that external paging modules such as serv_icq can add more
 663          * content to the Wholist.
 664          */
 665         PerformSessionHooks(EVT_RWHO);
 666         cprintf("000\n");
 667         }
 668
 669
 670 /*
 671  * Terminate another running session
 672  */
 673 void cmd_term(char *cmdbuf)
 674 {
 675         int session_num;
 676         struct CitContext *ccptr;
 677         int session_to_kill = 0;
 678
 679         if (!CC->logged_in) {
 680                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 681                 return;
 682                 }
 683
 684         if (CC->usersupp.axlevel < 6) {
 685                 cprintf("%d You must be an Aide to terminate sessions.\n",
 686                         ERROR+HIGHER_ACCESS_REQUIRED);
 687                 return;
 688                 }
 689
 690         session_num = extract_int(cmdbuf, 0);
 691         if (session_num == CC->cs_pid) {
 692                 cprintf("%d You can't kill your own session.\n", ERROR);
 693                 return;
 694                 }
 695
 696         lprintf(9, "Locating session to kill\n");
 697         begin_critical_section(S_SESSION_TABLE);
 698         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 699                 if (session_num == ccptr->cs_pid) {
 700                         session_to_kill = ccptr->cs_pid;
 701                         }
 702                 }
 703         end_critical_section(S_SESSION_TABLE);
 704         lprintf(9, "session_to_kill == %d\n", session_to_kill);
 705
 706         if (session_to_kill > 0) {
 707                 lprintf(9, "calling kill_session()\n");
 708                 kill_session(session_to_kill);
 709                 cprintf("%d Session terminated.\n", OK);
 710                 }
 711         else {
 712                 cprintf("%d No such session.\n", ERROR);
 713                 }
 714         }
 715
 716
 717
 718
 719
 720 /*
 721  * get the paginator prompt
 722  */
 723 void cmd_more(void) {
 724         cprintf("%d %s\n",OK,config.c_moreprompt);
 725         }
 726
 727 /*
 728  * echo
 729  */
 730 void cmd_echo(char *etext)
 731 {
 732         cprintf("%d %s\n",OK,etext);
 733         }
 734
 735
 736
 737 /*
 738  * identify as internal program
 739  */
 740 void cmd_ipgm(char *argbuf)
 741 {
 742         int secret;
 743
 744         secret = extract_int(argbuf, 0);
 745         if (secret == config.c_ipgm_secret) {
 746                 CC->internal_pgm = 1;
 747                 strcpy(CC->curr_user, "<internal program>");
 748                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 749                 cprintf("%d Authenticated as an internal program.\n",OK);
 750                 }
 751         else {
 752                 cprintf("%d Authentication failed.\n",ERROR);
 753                 lprintf(3, "Warning: ipgm authentication failed.\n");
 754                 }
 755         }
 756
 757
 758 /*
 759  * Shut down the server
 760  */
 761 void cmd_down(void) {
 762         if (!CC->logged_in) {
 763                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 764                 return;
 765                 }
 766
 767         if (CC->usersupp.axlevel < 6) {
 768                 cprintf("%d You must be an Aide to shut down the server.\n",
 769                         ERROR+HIGHER_ACCESS_REQUIRED);
 770                 return;
 771                 }
 772
 773         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 774         master_cleanup();
 775         }
 776
 777 /*
 778  * Schedule or cancel a server shutdown
 779  */
 780 void cmd_scdn(char *argbuf)
 781 {
 782         int new_state;
 783
 784         if (!CC->logged_in) {
 785                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 786                 return;
 787                 }
 788
 789         if (CC->usersupp.axlevel < 6) {
 790                 cprintf("%d You must be an Aide to schedule a shutdown.\n",
 791                         ERROR+HIGHER_ACCESS_REQUIRED);
 792                 return;
 793                 }
 794
 795         new_state = extract_int(argbuf, 0);
 796         if ((new_state == 0) || (new_state == 1)) {
 797                 ScheduledShutdown = new_state;
 798                 }
 799         cprintf("%d %d\n", OK, ScheduledShutdown);
 800         }
 801
 802
 803 /*
 804  * main context loop
 805  */
 806 void *context_loop(struct CitContext *con)
 807 {
 808         char cmdbuf[256];
 809         int num_sessions, len;
 810         struct sockaddr_in sin;
 811
 812         /*
 813          * Wedge our way into the context table.
 814          */
 815         InitMyContext(con);
 816
 817         /*
 818          * Initialize some variables specific to our context.
 819          */
 820         CC->logged_in = 0;
 821         CC->internal_pgm = 0;
 822         CC->download_fp = NULL;
 823         CC->upload_fp = NULL;
 824         CC->cs_pid = con->client_socket;        /* not necessarily portable */
 825         CC->FirstExpressMessage = NULL;
 826         time(&CC->lastcmd);
 827         time(&CC->lastidle);
 828         strcpy(CC->lastcmdname, "    ");
 829         strcpy(CC->cs_clientname, "(unknown)");
 830         strcpy(CC->curr_user,"(not logged in)");
 831         strcpy(CC->net_node,"");
 832         snprintf(CC->temp, sizeof CC->temp, tmpnam(NULL));
 833         safestrncpy(CC->cs_host, config.c_fqdn, sizeof CC->cs_host);
 834         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 835         len = sizeof sin;
 836         if (!getpeername(CC->client_socket, (struct sockaddr *) &sin, &len))
 837                 locate_host(CC->cs_host, &sin.sin_addr);
 838         CC->cs_flags = 0;
 839         CC->upload_type = UPL_FILE;
 840         CC->dl_is_net = 0;
 841         CC->FirstSessData = NULL;
 842
 843         num_sessions = session_count();
 844         CC->nologin = 0;
 845         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 846                 CC->nologin = 1;
 847
 848         if (CC->nologin==1) {
 849            cprintf("%d %s: Too many users are already online (maximum is %d)\n",
 850                 ERROR+MAX_SESSIONS_EXCEEDED,
 851                 config.c_nodename,config.c_maxsessions);
 852                 }
 853         else {
 854            cprintf("%d %s Citadel/UX server ready.\n",OK,config.c_nodename);
 855                 }
 856
 857         lprintf(3, "citserver[%3d]: started.\n", CC->cs_pid);
 858
 859         /* Run any session startup routines registered by loadable modules */
 860         PerformSessionHooks(EVT_START);
 861
 862         rec_log(CL_CONNECT, "");
 863
 864         do {
 865                 time(&CC->lastcmd);
 866                 memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 867                 if (client_gets(cmdbuf) < 1) cleanup(EXIT_NULL);
 868                 lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 869
 870                 /*
 871                  * Let other clients see the last command we executed, and
 872                  * update the idle time, but not NOOP, PEXP, or GEXP.
 873                  */
 874                 if ( (strncasecmp(cmdbuf, "NOOP", 4))
 875                    && (strncasecmp(cmdbuf, "PEXP", 4))
 876                    && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 877                         strcpy(CC->lastcmdname, "    ");
 878                         safestrncpy(CC->lastcmdname, cmdbuf,
 879                                 sizeof(CC->lastcmdname) );
 880                         time(&CC->lastidle);
 881                         }
 882
 883                 if ((strncasecmp(cmdbuf, "ENT0", 4)) && (strncasecmp(cmdbuf, "MESG", 4)) && (strncasecmp(cmdbuf, "MSGS", 4)))
 884                 {
 885                    CC->cs_flags &= ~CS_POSTING;
 886                 }
 887
 888 /*
 889  * This loop recognizes all server commands.
 890  */
 891
 892                 if (!strncasecmp(cmdbuf,"NOOP",4)) {
 893                         cprintf("%d%cok\n",OK,check_express());
 894                         }
 895
 896                 else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 897                         cprintf("%d Goodbye.\n",OK);
 898                         }
 899
 900                 else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 901                         if (CC->logged_in) logout(CC);
 902                         cprintf("%d logged out.\n",OK);
 903                         }
 904
 905                 else if (!strncasecmp(cmdbuf,"USER",4)) {
 906                         cmd_user(&cmdbuf[5]);
 907                         }
 908
 909                 else if (!strncasecmp(cmdbuf,"PASS",4)) {
 910                         cmd_pass(&cmdbuf[5]);
 911                         }
 912
 913                 else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 914                         cmd_newu(&cmdbuf[5]);
 915                         }
 916
 917                 else if (!strncasecmp(cmdbuf,"SETP",4)) {
 918                         cmd_setp(&cmdbuf[5]);
 919                         }
 920
 921                 else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 922                         cmd_lrms(&cmdbuf[5]);
 923                         }
 924
 925                 else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 926                         cmd_lkra(&cmdbuf[5]);
 927                         }
 928
 929                 else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 930                         cmd_lkrn(&cmdbuf[5]);
 931                         }
 932
 933                 else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 934                         cmd_lkro(&cmdbuf[5]);
 935                         }
 936
 937                 else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 938                         cmd_lzrm(&cmdbuf[5]);
 939                         }
 940
 941                 else if (!strncasecmp(cmdbuf,"GETU",4)) {
 942                         cmd_getu();
 943                         }
 944
 945                 else if (!strncasecmp(cmdbuf,"SETU",4)) {
 946                         cmd_setu(&cmdbuf[5]);
 947                         }
 948
 949                 else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 950                         cmd_goto(&cmdbuf[5]);
 951                         }
 952
 953                 else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 954                         cmd_msgs(&cmdbuf[5]);
 955                         }
 956
 957                 else if (!strncasecmp(cmdbuf,"WHOK",4)) {
 958                         cmd_whok();
 959                         }
 960
 961                 else if (!strncasecmp(cmdbuf,"RDIR",4)) {
 962                         cmd_rdir();
 963                         }
 964
 965                 else if (!strncasecmp(cmdbuf,"MSG0",4)) {
 966                         cmd_msg0(&cmdbuf[5]);
 967                         }
 968
 969                 else if (!strncasecmp(cmdbuf,"MSG2",4)) {
 970                         cmd_msg2(&cmdbuf[5]);
 971                         }
 972
 973                 else if (!strncasecmp(cmdbuf,"MSG3",4)) {
 974                         cmd_msg3(&cmdbuf[5]);
 975                         }
 976
 977                 else if (!strncasecmp(cmdbuf,"MSG4",4)) {
 978                         cmd_msg4(&cmdbuf[5]);
 979                         }
 980
 981                 else if (!strncasecmp(cmdbuf,"OPNA",4)) {
 982                         cmd_opna(&cmdbuf[5]);
 983                         }
 984
 985                 else if (!strncasecmp(cmdbuf,"INFO",4)) {
 986                         cmd_info();
 987                         }
 988
 989                 else if (!strncasecmp(cmdbuf,"SLRP",4)) {
 990                         cmd_slrp(&cmdbuf[5]);
 991                         }
 992
 993                 else if (!strncasecmp(cmdbuf,"INVT",4)) {
 994                         cmd_invt_kick(&cmdbuf[5],1);
 995                         }
 996
 997                 else if (!strncasecmp(cmdbuf,"KICK",4)) {
 998                         cmd_invt_kick(&cmdbuf[5],0);
 999                         }
1000
1001                 else if (!strncasecmp(cmdbuf,"GETR",4)) {
1002                         cmd_getr();
1003                         }
1004
1005                 else if (!strncasecmp(cmdbuf,"SETR",4)) {
1006                         cmd_setr(&cmdbuf[5]);
1007                         }
1008
1009                 else if (!strncasecmp(cmdbuf,"GETA",4)) {
1010                         cmd_geta();
1011                         }
1012
1013                 else if (!strncasecmp(cmdbuf,"SETA",4)) {
1014                         cmd_seta(&cmdbuf[5]);
1015                         }
1016
1017                 else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1018                         cmd_ent0(&cmdbuf[5]);
1019                         }
1020
1021                 else if (!strncasecmp(cmdbuf,"ENT3",4)) {
1022                         cmd_ent3(&cmdbuf[5]);
1023                         }
1024
1025                 else if (!strncasecmp(cmdbuf,"RINF",4)) {
1026                         cmd_rinf();
1027                         }
1028
1029                 else if (!strncasecmp(cmdbuf,"DELE",4)) {
1030                         cmd_dele(&cmdbuf[5]);
1031                         }
1032
1033                 else if (!strncasecmp(cmdbuf,"KILL",4)) {
1034                         cmd_kill(&cmdbuf[5]);
1035                         }
1036
1037                 else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1038                         cmd_cre8(&cmdbuf[5]);
1039                         }
1040
1041                 else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1042                         cmd_move(&cmdbuf[5]);
1043                         }
1044
1045                 else if (!strncasecmp(cmdbuf,"FORG",4)) {
1046                         cmd_forg();
1047                         }
1048
1049                 else if (!strncasecmp(cmdbuf,"MESG",4)) {
1050                         cmd_mesg(&cmdbuf[5]);
1051                         }
1052
1053                 else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1054                         cmd_emsg(&cmdbuf[5]);
1055                         }
1056
1057                 else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1058                         cmd_gnur();
1059                         }
1060
1061                 else if (!strncasecmp(cmdbuf,"VALI",4)) {
1062                         cmd_vali(&cmdbuf[5]);
1063                         }
1064
1065                 else if (!strncasecmp(cmdbuf,"EINF",4)) {
1066                         cmd_einf(&cmdbuf[5]);
1067                         }
1068
1069                 else if (!strncasecmp(cmdbuf,"LIST",4)) {
1070                         cmd_list();
1071                         }
1072
1073                 else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1074                         cmd_chek();
1075                         }
1076
1077                 else if (!strncasecmp(cmdbuf,"DELF",4)) {
1078                         cmd_delf(&cmdbuf[5]);
1079                         }
1080
1081                 else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1082                         cmd_movf(&cmdbuf[5]);
1083                         }
1084
1085                 else if (!strncasecmp(cmdbuf,"NETF",4)) {
1086                         cmd_netf(&cmdbuf[5]);
1087                         }
1088
1089                 else if (!strncasecmp(cmdbuf,"RWHO",4)) {
1090                         cmd_rwho();
1091                         }
1092
1093                 else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1094                         cmd_open(&cmdbuf[5]);
1095                         }
1096
1097                 else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1098                         cmd_clos();
1099                         }
1100
1101                 else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1102                         cmd_uopn(&cmdbuf[5]);
1103                         }
1104
1105                 else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1106                         cmd_ucls(&cmdbuf[5]);
1107                         }
1108
1109                 else if (!strncasecmp(cmdbuf,"READ",4)) {
1110                         cmd_read(&cmdbuf[5]);
1111                         }
1112
1113                 else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1114                         cmd_writ(&cmdbuf[5]);
1115                         }
1116
1117                 else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1118                         cmd_qusr(&cmdbuf[5]);
1119                         }
1120
1121                 else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1122                         cmd_echo(&cmdbuf[5]);
1123                         }
1124
1125                 else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1126                         cmd_oimg(&cmdbuf[5]);
1127                         }
1128
1129                 else if (!strncasecmp(cmdbuf,"MORE",4)) {
1130                         cmd_more();
1131                         }
1132
1133                 else if (!strncasecmp(cmdbuf,"NETP",4)) {
1134                         cmd_netp(&cmdbuf[5]);
1135                         }
1136
1137                 else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1138                         cmd_ndop(&cmdbuf[5]);
1139                         }
1140
1141                 else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1142                         cmd_nuop(&cmdbuf[5]);
1143                         }
1144
1145                 else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1146                         cmd_lflr();
1147                         }
1148
1149                 else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1150                         cmd_cflr(&cmdbuf[5]);
1151                         }
1152
1153                 else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1154                         cmd_kflr(&cmdbuf[5]);
1155                         }
1156
1157                 else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1158                         cmd_eflr(&cmdbuf[5]);
1159                         }
1160
1161                 else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1162                         cmd_iden(&cmdbuf[5]);
1163                         }
1164
1165                 else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1166                         cmd_ipgm(&cmdbuf[5]);
1167                         }
1168
1169                 else if (!strncasecmp(cmdbuf,"EBIO",4)) {
1170                         cmd_ebio();
1171                         }
1172
1173                 else if (!strncasecmp(cmdbuf,"RBIO",4)) {
1174                         cmd_rbio(&cmdbuf[5]);
1175                         }
1176
1177                 else if (!strncasecmp(cmdbuf,"LBIO",4)) {
1178                         cmd_lbio();
1179                         }
1180
1181                 else if (!strncasecmp(cmdbuf,"STEL",4)) {
1182                         cmd_stel(&cmdbuf[5]);
1183                         }
1184
1185                 else if (!strncasecmp(cmdbuf,"TERM",4)) {
1186                         cmd_term(&cmdbuf[5]);
1187                         }
1188
1189                 else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1190                         cmd_down();
1191                         }
1192
1193                 else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1194                         cmd_scdn(&cmdbuf[5]);
1195                         }
1196
1197                 else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1198                         cmd_nset(&cmdbuf[5]);
1199                         }
1200
1201                 else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1202                         cmd_uimg(&cmdbuf[5]);
1203                         }
1204
1205                 else if (!strncasecmp(cmdbuf, "UCHG", 4)) {
1206                         cmd_uchg(&cmdbuf[5]);
1207                         }
1208
1209                 else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1210                         cmd_time();
1211                         }
1212
1213                 else if (!strncasecmp(cmdbuf, "HCHG", 4)) {
1214                         cmd_hchg(&cmdbuf[5]);
1215                         }
1216
1217                 else if (!strncasecmp(cmdbuf, "RCHG", 4)) {
1218                         cmd_rchg(&cmdbuf[5]);
1219                         }
1220
1221                 else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1222                         cmd_agup(&cmdbuf[5]);
1223                         }
1224
1225                 else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1226                         cmd_asup(&cmdbuf[5]);
1227                         }
1228
1229                 else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1230                         cmd_gpex(&cmdbuf[5]);
1231                         }
1232
1233                 else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1234                         cmd_spex(&cmdbuf[5]);
1235                         }
1236
1237                 else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1238                         cmd_conf(&cmdbuf[5]);
1239                         }
1240
1241 #ifdef DEBUG_MEMORY_LEAKS
1242                 else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1243                         dump_tracked();
1244                         }
1245 #endif
1246
1247                 else if (!DLoader_Exec_Cmd(cmdbuf))
1248                         {
1249                            cprintf("%d Unrecognized or unsupported command.\n",
1250                                     ERROR);
1251                         }
1252
1253                 /* Run any after-each-command outines registered by modules */
1254                 PerformSessionHooks(EVT_CMD);
1255
1256                 } while(strncasecmp(cmdbuf, "QUIT", 4));
1257
1258         cleanup(EXIT_NORMAL);
1259         return(NULL);
1260         }