citadel/citserver.c

   1 /* $Id$ */
   2 #include "sysdep.h"
   3 #include <stdlib.h>
   4 #include <unistd.h>
   5 #include <stdio.h>
   6 #include <fcntl.h>
   7 #include <signal.h>
   8 #include <time.h>
   9 #include <ctype.h>
  10 #include <string.h>
  11 #include <errno.h>
  12 #include <limits.h>
  13 #include <syslog.h>
  14 #include <dlfcn.h>
  15 #include <netdb.h>
  16 #include <sys/types.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include "citadel.h"
  21 #include "server.h"
  22 #include "sysdep_decls.h"
  23 #include "citserver.h"
  24 #include "config.h"
  25 #include "database.h"
  26 #include "housekeeping.h"
  27 #include "user_ops.h"
  28 #include "logging.h"
  29 #include "msgbase.h"
  30 #include "support.h"
  31 #include "locate_host.h"
  32 #include "room_ops.h"
  33 #include "file_ops.h"
  34 #include "dynloader.h"
  35 #include "policy.h"
  36 #include "control.h"
  37 #include "tools.h"
  38
  39 struct CitContext *ContextList = NULL;
  40 char *unique_session_numbers;
  41 int ScheduledShutdown = 0;
  42 int do_defrag = 0;
  43
  44 /*
  45  * Various things that need to be initialized at startup
  46  */
  47 void master_startup(void) {
  48         lprintf(7, "Opening databases\n");
  49         open_databases();
  50
  51         if (do_defrag)
  52                 defrag_databases();
  53
  54         lprintf(7, "Checking floor reference counts\n");
  55         check_ref_counts();
  56
  57         lprintf(7, "Creating base rooms (if necessary)\n");
  58         create_room(BASEROOM,           0, "", 0);
  59         create_room(AIDEROOM,           3, "", 0);
  60         create_room(SYSCONFIGROOM,      3, "", 0);
  61         create_room(config.c_twitroom,  0, "", 0);
  62         }
  63
  64 /*
  65  * Cleanup routine to be called when the server is shutting down.
  66  */
  67 void master_cleanup(void) {
  68         struct CleanupFunctionHook *fcn;
  69
  70         /* Cancel all running sessions */
  71         lprintf(7, "Cancelling running sessions...\n");
  72
  73 /* FIXME do something here
  74         while (ContextList != NULL) {
  75                 }
  76  */
  77
  78         /* Run any cleanup routines registered by loadable modules */
  79         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
  80                 (*fcn->h_function_pointer)();
  81                 }
  82
  83         /* Close databases */
  84         lprintf(7, "Closing databases\n");
  85         close_databases();
  86
  87         /* Do system-dependent stuff */
  88         sysdep_master_cleanup();
  89
  90         /* Now go away. */
  91         lprintf(3, "citserver: exiting.\n");
  92         fflush(stdout); fflush(stderr);
  93         exit(0);
  94         }
  95
  96
  97 /*
  98  * Free any per-session data allocated by modules or whatever
  99  */
 100 void deallocate_user_data(struct CitContext *con)
 101 {
 102         struct CtdlSessData *ptr;
 103
 104         begin_critical_section(S_SESSION_TABLE);
 105         while (con->FirstSessData != NULL) {
 106                 lprintf(9, "Deallocating user data symbol %ld\n",
 107                         con->FirstSessData->sym_id);
 108                 if (con->FirstSessData->sym_data != NULL)
 109                         phree(con->FirstSessData->sym_data);
 110                 ptr = con->FirstSessData->next;
 111                 phree(con->FirstSessData);
 112                 con->FirstSessData = ptr;
 113         }
 114         end_critical_section(S_SESSION_TABLE);
 115 }
 116
 117
 118
 119
 120 /*
 121  * Terminate a session and remove its context data structure.
 122  */
 123 void RemoveContext (struct CitContext *con)
 124 {
 125         struct CitContext *ptr = NULL;
 126         struct CitContext *ToFree = NULL;
 127
 128         lprintf(9, "RemoveContext() called\n");
 129         if (con==NULL) {
 130                 lprintf(5, "WARNING: RemoveContext() called with NULL!\n");
 131                 return;
 132                 }
 133
 134         /* Remove the context from the global context list.  This needs
 135          * to get done FIRST to avoid concurrency problems.  It is *vitally*
 136          * important to keep num_sessions accurate!!
 137          */
 138         lprintf(7, "Removing context for session %d\n", con->cs_pid);
 139         begin_critical_section(S_SESSION_TABLE);
 140         if (ContextList == con) {
 141                 ToFree = ContextList;
 142                 ContextList = ContextList->next;
 143                 --num_sessions;
 144                 }
 145         else {
 146                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 147                         if (ptr->next == con) {
 148                                 ToFree = ptr->next;
 149                                 ptr->next = ptr->next->next;
 150                                 --num_sessions;
 151                                 }
 152                         }
 153                 }
 154         end_critical_section(S_SESSION_TABLE);
 155
 156         if (ToFree == NULL) {
 157                 lprintf(9, "RemoveContext() found nothing to remove\n");
 158                 return;
 159         }
 160
 161         /* Run any cleanup routines registered by loadable modules.
 162          * Note 1: This must occur *before* deallocate_user_data() because the
 163          *         cleanup functions might touch dynamic session data.
 164          * Note 2: We have to "become_session()" because the cleanup functions
 165          *         might make references to "CC" assuming it's the right one.
 166          */
 167         become_session(con);
 168         PerformSessionHooks(EVT_STOP);
 169         become_session(NULL);
 170
 171         /* Now handle all of the administrivia. */
 172         lprintf(7, "Calling logout(%d)\n", con->cs_pid);
 173         logout(con);
 174
 175         rec_log(CL_TERMINATE, con->curr_user);
 176         unlink(con->temp);
 177         lprintf(3, "citserver[%3d]: ended.\n", con->cs_pid);
 178
 179
 180         syslog(LOG_NOTICE,"session %d ended", con->cs_pid);
 181
 182         /* Deallocate any user-data attached to this session */
 183         deallocate_user_data(con);
 184
 185         /* If the client is still connected, blow 'em away. */
 186         lprintf(7, "Closing socket %d\n", con->client_socket);
 187         close(con->client_socket);
 188
 189         /* Tell the housekeeping thread to check to see if this is the time
 190          * to initiate a scheduled shutdown event.
 191          */
 192         enter_housekeeping_cmd("SCHED_SHUTDOWN");
 193
 194         /* Free up the memory used by this context */
 195         phree(con);
 196
 197         lprintf(7, "Done with RemoveContext()\n");
 198 }
 199
 200
 201
 202 /*
 203  * Get a dynamic symbol number for per-session user data.
 204  * This API call should be made only ONCE per symbol per citserver run.
 205  */
 206 int CtdlGetDynamicSymbol()
 207 {
 208         static unsigned int next_symbol = SYM_MAX;
 209         return ++next_symbol;
 210 }
 211
 212
 213
 214 /*
 215  * Return a pointer to some generic per-session user data.
 216  * (This function returns NULL if the requested symbol is not allocated.)
 217  *
 218  * NOTE: we use critical sections for allocating and de-allocating these,
 219  *       but not for locating one.
 220  */
 221 void *CtdlGetUserData(unsigned long requested_sym)
 222 {
 223         struct CtdlSessData *ptr;
 224
 225         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 226                 if (ptr->sym_id == requested_sym)
 227                         return(ptr->sym_data);
 228
 229         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 230                 requested_sym);
 231         return NULL;
 232 }
 233
 234
 235 /*
 236  * Allocate some generic per-session user data.
 237  */
 238 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 239 {
 240         struct CtdlSessData *ptr;
 241
 242         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 243
 244         /* Fail silently if the symbol is already registered. */
 245         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 246                 if (ptr->sym_id == requested_sym) {
 247                         return;
 248                 }
 249         }
 250
 251         /* Grab us some memory!  Dem's good eatin' !!  */
 252         ptr = mallok(sizeof(struct CtdlSessData));
 253         ptr->sym_id = requested_sym;
 254         ptr->sym_data = mallok(num_bytes);
 255         memset(ptr->sym_data, 0, num_bytes);
 256
 257         begin_critical_section(S_SESSION_TABLE);
 258         ptr->next = CC->FirstSessData;
 259         CC->FirstSessData = ptr;
 260         end_critical_section(S_SESSION_TABLE);
 261
 262         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 263 }
 264
 265
 266 /*
 267  * Change the size of a buffer allocated with CtdlAllocUserData()
 268  */
 269 void CtdlReallocUserData(unsigned long requested_sym, size_t num_bytes)
 270 {
 271         struct CtdlSessData *ptr;
 272
 273         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 274                 if (ptr->sym_id == requested_sym) {
 275                         ptr->sym_data = reallok(ptr->sym_data, num_bytes);
 276                         return;
 277                 }
 278         }
 279
 280         lprintf(2, "CtdlReallocUserData() ERROR: symbol %ld not found!\n",
 281                 requested_sym);
 282 }
 283
 284
 285
 286
 287
 288
 289 /*
 290  * cmd_info()  -  tell the client about this server
 291  */
 292 void cmd_info(void) {
 293         cprintf("%d Server info:\n",LISTING_FOLLOWS);
 294         cprintf("%d\n",CC->cs_pid);
 295         cprintf("%s\n",config.c_nodename);
 296         cprintf("%s\n",config.c_humannode);
 297         cprintf("%s\n",config.c_fqdn);
 298         cprintf("%s\n",CITADEL);
 299         cprintf("%d\n",REV_LEVEL);
 300         cprintf("%s\n",config.c_bbs_city);
 301         cprintf("%s\n",config.c_sysadm);
 302         cprintf("%d\n",SERVER_TYPE);
 303         cprintf("%s\n",config.c_moreprompt);
 304         cprintf("1\n"); /* 1 = yes, this system supports floors */
 305         cprintf("1\n"); /* 1 = we support the extended paging options */
 306         cprintf("000\n");
 307         }
 308
 309 void cmd_rchg(char *argbuf)
 310 {
 311         char newroomname[256];
 312
 313         extract(newroomname, argbuf, 0);
 314         newroomname[ROOMNAMELEN-1] = 0;
 315         if (strlen(newroomname) > 0) {
 316                 safestrncpy(CC->fake_roomname, newroomname,
 317                         sizeof(CC->fake_roomname) );
 318                 }
 319         else {
 320                 strcpy(CC->fake_roomname, "");
 321                 }
 322         cprintf("%d OK\n", OK);
 323 }
 324
 325 void cmd_hchg(char *argbuf)
 326 {
 327         char newhostname[256];
 328
 329         extract(newhostname, argbuf, 0);
 330         if (strlen(newhostname) > 0) {
 331                 safestrncpy(CC->fake_hostname, newhostname,
 332                         sizeof(CC->fake_hostname) );
 333                 }
 334         else {
 335                 strcpy(CC->fake_hostname, "");
 336                 }
 337         cprintf("%d OK\n", OK);
 338 }
 339
 340 void cmd_uchg(char *argbuf)
 341 {
 342
 343         char newusername[256];
 344
 345         extract(newusername, argbuf, 0);
 346
 347         if (CC->usersupp.axlevel < 6) {
 348                 cprintf("%d You must be an Aide to masquerade your name.\n",
 349                         ERROR+HIGHER_ACCESS_REQUIRED);
 350                 return;
 351         }
 352
 353         if (strlen(newusername) > 0) {
 354                 CC->cs_flags &= ~CS_STEALTH;
 355                 memset(CC->fake_username, 0, 32);
 356                 if (strncasecmp(newusername, CC->curr_user,
 357                                 strlen(CC->curr_user)))
 358                         safestrncpy(CC->fake_username, newusername,
 359                                 sizeof(CC->fake_username));
 360         }
 361         else {
 362                 CC->fake_username[0] = '\0';
 363                 CC->cs_flags |= CS_STEALTH;
 364         }
 365         cprintf("%d\n",OK);
 366 }
 367
 368
 369
 370 /*
 371  * returns an asterisk if there are any express messages waiting,
 372  * space otherwise.
 373  */
 374 char CtdlCheckExpress(void) {
 375         if (CC->FirstExpressMessage == NULL) {
 376                 return(' ');
 377                 }
 378         else {
 379                 return('*');
 380                 }
 381         }
 382
 383 void cmd_time(void)
 384 {
 385    time_t tv;
 386
 387    tv = time(NULL);
 388
 389    cprintf("%d %ld\n", OK, tv);
 390 }
 391
 392 /*
 393  * Check whether two hostnames match.
 394  * "Realname" should be an actual name of a client that is trying to connect;
 395  * "testname" should be the value we are comparing it with. The idea is that we
 396  * want to compare with both the abbreviated and fully-qualified versions of
 397  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 398  */
 399 static int hostnames_match(const char *realname, const char *testname) {
 400         struct hostent *he;
 401         int retval = 0;
 402
 403         if (!strcasecmp(realname, testname))
 404                 return 1;
 405
 406 #ifdef HAVE_NONREENTRANT_NETDB
 407         begin_critical_section(S_NETDB);
 408 #endif
 409
 410         if ((he = gethostbyname(testname)) != NULL)
 411                 if (!strcasecmp(realname, he->h_name))
 412                         retval = 1;
 413
 414 #ifdef HAVE_NONREENTRANT_NETDB
 415         end_critical_section(S_NETDB);
 416 #endif
 417
 418         return retval;
 419         }
 420
 421 /*
 422  * check a hostname against the public_clients file
 423  */
 424 int is_public_client(char *where)
 425 {
 426         char buf[256];
 427         FILE *fp;
 428
 429         if (hostnames_match(where,"localhost")) return(1);
 430         if (hostnames_match(where,config.c_fqdn)) return(1);
 431
 432         fp = fopen("public_clients","r");
 433         if (fp == NULL) return(0);
 434
 435         while (fgets(buf,256,fp)!=NULL) {
 436                 while (isspace((buf[strlen(buf)-1])))
 437                         buf[strlen(buf)-1] = 0;
 438                 if (hostnames_match(where,buf)) {
 439                         fclose(fp);
 440                         return(1);
 441                         }
 442                 }
 443
 444         fclose(fp);
 445         return(0);
 446         }
 447
 448
 449 /*
 450  * the client is identifying itself to the server
 451  */
 452 void cmd_iden(char *argbuf)
 453 {
 454         int dev_code;
 455         int cli_code;
 456         int rev_level;
 457         char desc[256];
 458         char from_host[256];
 459         struct in_addr addr;
 460
 461         if (num_parms(argbuf)<4) {
 462                 cprintf("%d usage error\n",ERROR);
 463                 return;
 464                 }
 465
 466         dev_code = extract_int(argbuf,0);
 467         cli_code = extract_int(argbuf,1);
 468         rev_level = extract_int(argbuf,2);
 469         extract(desc,argbuf,3);
 470
 471         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 472         from_host[sizeof from_host - 1] = 0;
 473         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 474
 475         CC->cs_clientdev = dev_code;
 476         CC->cs_clienttyp = cli_code;
 477         CC->cs_clientver = rev_level;
 478         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 479         CC->cs_clientname[31] = 0;
 480
 481         lprintf(9, "Looking up hostname '%s'\n", from_host);
 482         if ((strlen(from_host)>0) &&
 483            (is_public_client(CC->cs_host))) {
 484                 if ((addr.s_addr = inet_addr(from_host)) != INADDR_NONE)
 485                         locate_host(CC->cs_host, &addr);
 486                 else {
 487                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 488                         CC->cs_host[24] = 0;
 489                         }
 490                 }
 491
 492         syslog(LOG_NOTICE,"client %d/%d/%01d.%02d (%s)\n",
 493                 dev_code,
 494                 cli_code,
 495                 (rev_level / 100),
 496                 (rev_level % 100),
 497                 desc);
 498                 cprintf("%d Ok\n",OK);
 499         }
 500
 501
 502 /*
 503  * enter or exit "stealth mode"
 504  */
 505 void cmd_stel(char *cmdbuf)
 506 {
 507         int requested_mode;
 508
 509         requested_mode = extract_int(cmdbuf,0);
 510         if (requested_mode !=0) requested_mode = 1;
 511
 512         if (!CC->logged_in) {
 513                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 514                 return;
 515                 }
 516
 517         if (CC->usersupp.axlevel < 6) {
 518                 cprintf("%d You must be an Aide to use stealth mode.\n",
 519                         ERROR+HIGHER_ACCESS_REQUIRED);
 520                 return;
 521                 }
 522
 523         if (CC->cs_flags & CS_STEALTH) {
 524                 if (requested_mode == 0)
 525                         CC->cs_flags = CC->cs_flags-CS_STEALTH;
 526                 }
 527         else {
 528                 if (requested_mode == 1)
 529                         CC->cs_flags = CC->cs_flags|CS_STEALTH;
 530                 }
 531
 532         cprintf("%d Ok\n",OK);
 533         }
 534
 535
 536
 537
 538 /*
 539  * display system messages or help
 540  */
 541 void cmd_mesg(char *mname)
 542 {
 543         FILE *mfp;
 544         char targ[256];
 545         char buf[256];
 546         char *dirs[2];
 547
 548         extract(buf,mname,0);
 549
 550
 551         dirs[0]=mallok(64);
 552         dirs[1]=mallok(64);
 553         strcpy(dirs[0],"messages");
 554         strcpy(dirs[1],"help");
 555         mesg_locate(targ,buf,2,dirs);
 556         phree(dirs[0]);
 557         phree(dirs[1]);
 558
 559
 560         if (strlen(targ)==0) {
 561                 cprintf("%d '%s' not found.\n",ERROR,mname);
 562                 return;
 563                 }
 564
 565         mfp = fopen(targ,"r");
 566         if (mfp==NULL) {
 567                 cprintf("%d Cannot open '%s': %s\n",
 568                         ERROR,targ,strerror(errno));
 569                 return;
 570                 }
 571         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 572
 573         while (fgets(buf,255,mfp)!=NULL) {
 574                 buf[strlen(buf)-1] = 0;
 575                 do_help_subst(buf);
 576                 cprintf("%s\n",buf);
 577                 }
 578
 579         fclose(mfp);
 580         cprintf("000\n");
 581         }
 582
 583
 584 /*
 585  * enter system messages or help
 586  */
 587 void cmd_emsg(char *mname)
 588 {
 589         FILE *mfp;
 590         char targ[256];
 591         char buf[256];
 592         char *dirs[2];
 593         int a;
 594
 595         if (CC->usersupp.axlevel < 6) {
 596                 cprintf("%d You must be an Aide to edit system messages.\n",
 597                         ERROR+HIGHER_ACCESS_REQUIRED);
 598                 return;
 599                 }
 600
 601         extract(buf,mname,0);
 602         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 603                 if (buf[a] == '/') buf[a] = '.';
 604                 }
 605
 606         dirs[0]=mallok(64);
 607         dirs[1]=mallok(64);
 608         strcpy(dirs[0],"messages");
 609         strcpy(dirs[1],"help");
 610         mesg_locate(targ,buf,2,dirs);
 611         phree(dirs[0]);
 612         phree(dirs[1]);
 613
 614         if (strlen(targ)==0) {
 615                 snprintf(targ, sizeof targ, "./help/%s", buf);
 616                 }
 617
 618         mfp = fopen(targ,"w");
 619         if (mfp==NULL) {
 620                 cprintf("%d Cannot open '%s': %s\n",
 621                         ERROR,targ,strerror(errno));
 622                 return;
 623                 }
 624         cprintf("%d %s\n", SEND_LISTING, targ);
 625
 626         while (client_gets(buf), strcmp(buf, "000")) {
 627                 fprintf(mfp, "%s\n", buf);
 628                 }
 629
 630         fclose(mfp);
 631         }
 632
 633
 634 /* Don't show the names of private rooms unless the viewing
 635  * user also knows the rooms.
 636  */
 637 void GenerateRoomDisplay(char *real_room,
 638                         struct CitContext *viewed,
 639                         struct CitContext *viewer) {
 640
 641         strcpy(real_room, viewed->quickroom.QRname);
 642         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 643                 strcpy(real_room, &real_room[11]);
 644         }
 645         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 646                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 647                    & UA_KNOWN) == 0) {
 648                         strcpy(real_room, "<private room>");
 649                 }
 650         }
 651
 652         if (viewed->cs_flags & CS_CHAT) {
 653                 while (strlen(real_room) < 14)
 654                         strcat(real_room, " ");
 655
 656                 strcpy(&real_room[14], "<chat>");
 657         }
 658
 659 }
 660
 661
 662
 663 /*
 664  * Terminate another running session
 665  */
 666 void cmd_term(char *cmdbuf)
 667 {
 668         int session_num;
 669         struct CitContext *ccptr;
 670         int found_it = 0;
 671
 672         if (!CC->logged_in) {
 673                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 674                 return;
 675                 }
 676
 677         if (CC->usersupp.axlevel < 6) {
 678                 cprintf("%d You must be an Aide to terminate sessions.\n",
 679                         ERROR+HIGHER_ACCESS_REQUIRED);
 680                 return;
 681                 }
 682
 683         session_num = extract_int(cmdbuf, 0);
 684         if (session_num == CC->cs_pid) {
 685                 cprintf("%d You can't kill your own session.\n", ERROR);
 686                 return;
 687                 }
 688
 689         lprintf(9, "Locating session to kill\n");
 690         begin_critical_section(S_SESSION_TABLE);
 691         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 692                 if (session_num == ccptr->cs_pid) {
 693                         ccptr->kill_me = 1;
 694                         found_it = 1;
 695                         }
 696                 }
 697         end_critical_section(S_SESSION_TABLE);
 698
 699         if (found_it) {
 700                 cprintf("%d Session terminated.\n", OK);
 701                 }
 702         else {
 703                 cprintf("%d No such session.\n", ERROR);
 704                 }
 705         }
 706
 707
 708
 709
 710
 711 /*
 712  * get the paginator prompt
 713  */
 714 void cmd_more(void) {
 715         cprintf("%d %s\n",OK,config.c_moreprompt);
 716         }
 717
 718 /*
 719  * echo
 720  */
 721 void cmd_echo(char *etext)
 722 {
 723         cprintf("%d %s\n",OK,etext);
 724         }
 725
 726
 727
 728 /*
 729  * identify as internal program
 730  */
 731 void cmd_ipgm(char *argbuf)
 732 {
 733         int secret;
 734
 735         secret = extract_int(argbuf, 0);
 736         if (secret == config.c_ipgm_secret) {
 737                 CC->internal_pgm = 1;
 738                 strcpy(CC->curr_user, "<internal program>");
 739                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 740                 cprintf("%d Authenticated as an internal program.\n",OK);
 741                 }
 742         else {
 743                 cprintf("%d Authentication failed.\n",ERROR);
 744                 lprintf(3, "Warning: ipgm authentication failed.\n");
 745                 }
 746         }
 747
 748
 749 /*
 750  * Shut down the server
 751  */
 752 void cmd_down(void) {
 753         if (!CC->logged_in) {
 754                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 755                 return;
 756                 }
 757
 758         if (CC->usersupp.axlevel < 6) {
 759                 cprintf("%d You must be an Aide to shut down the server.\n",
 760                         ERROR+HIGHER_ACCESS_REQUIRED);
 761                 return;
 762                 }
 763
 764         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 765         master_cleanup();
 766         }
 767
 768 /*
 769  * Schedule or cancel a server shutdown
 770  */
 771 void cmd_scdn(char *argbuf)
 772 {
 773         int new_state;
 774
 775         if (!CC->logged_in) {
 776                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 777                 return;
 778                 }
 779
 780         if (CC->usersupp.axlevel < 6) {
 781                 cprintf("%d You must be an Aide to schedule a shutdown.\n",
 782                         ERROR+HIGHER_ACCESS_REQUIRED);
 783                 return;
 784                 }
 785
 786         new_state = extract_int(argbuf, 0);
 787         if ((new_state == 0) || (new_state == 1)) {
 788                 ScheduledShutdown = new_state;
 789                 }
 790         cprintf("%d %d\n", OK, ScheduledShutdown);
 791         }
 792
 793
 794 /*
 795  * Back-end function for starting a session
 796  */
 797 void begin_session(struct CitContext *con)
 798 {
 799         int len;
 800         struct sockaddr_in sin;
 801
 802         /*
 803          * Initialize some variables specific to our context.
 804          */
 805         con->logged_in = 0;
 806         con->internal_pgm = 0;
 807         con->download_fp = NULL;
 808         con->upload_fp = NULL;
 809         con->FirstExpressMessage = NULL;
 810         time(&con->lastcmd);
 811         time(&con->lastidle);
 812         strcpy(con->lastcmdname, "    ");
 813         strcpy(con->cs_clientname, "(unknown)");
 814         strcpy(con->curr_user, NLI);
 815         strcpy(con->net_node,"");
 816         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 817         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 818         con->cs_host[sizeof con->cs_host - 1] = 0;
 819         len = sizeof sin;
 820         if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len))
 821                 locate_host(con->cs_host, &sin.sin_addr);
 822         con->cs_flags = 0;
 823         con->upload_type = UPL_FILE;
 824         con->dl_is_net = 0;
 825         con->FirstSessData = NULL;
 826
 827         con->nologin = 0;
 828         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 829                 con->nologin = 1;
 830
 831         lprintf(3, "citserver[%3d]: started.\n", con->cs_pid);
 832
 833         /* Run any session startup routines registered by loadable modules */
 834         PerformSessionHooks(EVT_START);
 835
 836         rec_log(CL_CONNECT, "");
 837 }
 838
 839
 840 void citproto_begin_session() {
 841         if (CC->nologin==1) {
 842                 cprintf("%d %s: Too many users are already online "
 843                         "(maximum is %d)\n",
 844                         ERROR+MAX_SESSIONS_EXCEEDED,
 845                         config.c_nodename, config.c_maxsessions);
 846                 }
 847         else {
 848                 cprintf("%d %s Citadel/UX server ready.\n",
 849                         OK, config.c_nodename);
 850                 }
 851 }
 852
 853
 854
 855
 856 /*
 857  * This loop recognizes all server commands.
 858  */
 859 void do_command_loop(void) {
 860         char cmdbuf[256];
 861
 862         time(&CC->lastcmd);
 863         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 864         if (client_gets(cmdbuf) < 1) {
 865                 lprintf(3, "Client socket is broken.  Ending session.\n");
 866                 CC->kill_me = 1;
 867                 return;
 868         }
 869         lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 870
 871         /*
 872          * Let other clients see the last command we executed, and
 873          * update the idle time, but not NOOP, PEXP, or GEXP.
 874          */
 875         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 876            && (strncasecmp(cmdbuf, "PEXP", 4))
 877            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 878                 strcpy(CC->lastcmdname, "    ");
 879                 safestrncpy(CC->lastcmdname, cmdbuf,
 880                         sizeof(CC->lastcmdname) );
 881                 time(&CC->lastidle);
 882                 }
 883
 884         if ((strncasecmp(cmdbuf, "ENT0", 4))
 885            && (strncasecmp(cmdbuf, "MESG", 4))
 886            && (strncasecmp(cmdbuf, "MSGS", 4)))
 887         {
 888            CC->cs_flags &= ~CS_POSTING;
 889         }
 890
 891         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 892                 cprintf("%d%cok\n",OK,CtdlCheckExpress());
 893                 }
 894
 895         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 896                 cprintf("%d Goodbye.\n",OK);
 897                 CC->kill_me = 1;
 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,"OPEN",4)) {
1090                 cmd_open(&cmdbuf[5]);
1091                 }
1092
1093         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1094                 cmd_clos();
1095                 }
1096
1097         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1098                 cmd_uopn(&cmdbuf[5]);
1099                 }
1100
1101         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1102                 cmd_ucls(&cmdbuf[5]);
1103                 }
1104
1105         else if (!strncasecmp(cmdbuf,"READ",4)) {
1106                 cmd_read(&cmdbuf[5]);
1107                 }
1108
1109         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1110                 cmd_writ(&cmdbuf[5]);
1111                 }
1112
1113         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1114                 cmd_qusr(&cmdbuf[5]);
1115                 }
1116
1117         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1118                 cmd_echo(&cmdbuf[5]);
1119                 }
1120
1121         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1122                 cmd_oimg(&cmdbuf[5]);
1123                 }
1124
1125         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1126                 cmd_more();
1127                 }
1128
1129         else if (!strncasecmp(cmdbuf,"NETP",4)) {
1130                 cmd_netp(&cmdbuf[5]);
1131                 }
1132
1133         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1134                 cmd_ndop(&cmdbuf[5]);
1135                 }
1136
1137         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1138                 cmd_nuop(&cmdbuf[5]);
1139                 }
1140
1141         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1142                 cmd_lflr();
1143                 }
1144
1145         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1146                 cmd_cflr(&cmdbuf[5]);
1147                 }
1148
1149         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1150                 cmd_kflr(&cmdbuf[5]);
1151                 }
1152
1153         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1154                 cmd_eflr(&cmdbuf[5]);
1155                 }
1156
1157         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1158                 cmd_iden(&cmdbuf[5]);
1159                 }
1160
1161         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1162                 cmd_ipgm(&cmdbuf[5]);
1163                 }
1164
1165         else if (!strncasecmp(cmdbuf,"EBIO",4)) {
1166                 cmd_ebio();
1167                 }
1168
1169         else if (!strncasecmp(cmdbuf,"RBIO",4)) {
1170                 cmd_rbio(&cmdbuf[5]);
1171                 }
1172
1173         else if (!strncasecmp(cmdbuf,"LBIO",4)) {
1174                 cmd_lbio();
1175                 }
1176
1177         else if (!strncasecmp(cmdbuf,"STEL",4)) {
1178                 cmd_stel(&cmdbuf[5]);
1179                 }
1180
1181         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1182                 cmd_term(&cmdbuf[5]);
1183                 }
1184
1185         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1186                 cmd_down();
1187                 }
1188
1189         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1190                 cmd_scdn(&cmdbuf[5]);
1191                 }
1192
1193         else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1194                 cmd_nset(&cmdbuf[5]);
1195                 }
1196
1197         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1198                 cmd_uimg(&cmdbuf[5]);
1199                 }
1200
1201         else if (!strncasecmp(cmdbuf, "UCHG", 4)) {
1202                 cmd_uchg(&cmdbuf[5]);
1203                 }
1204
1205         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1206                 cmd_time();
1207                 }
1208
1209         else if (!strncasecmp(cmdbuf, "HCHG", 4)) {
1210                 cmd_hchg(&cmdbuf[5]);
1211                 }
1212
1213         else if (!strncasecmp(cmdbuf, "RCHG", 4)) {
1214                 cmd_rchg(&cmdbuf[5]);
1215                 }
1216
1217         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1218                 cmd_agup(&cmdbuf[5]);
1219                 }
1220
1221         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1222                 cmd_asup(&cmdbuf[5]);
1223                 }
1224
1225         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1226                 cmd_gpex(&cmdbuf[5]);
1227                 }
1228
1229         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1230                 cmd_spex(&cmdbuf[5]);
1231                 }
1232
1233         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1234                 cmd_conf(&cmdbuf[5]);
1235                 }
1236
1237 #ifdef DEBUG_MEMORY_LEAKS
1238         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1239                 dump_tracked();
1240                 }
1241 #endif
1242
1243         else if (!DLoader_Exec_Cmd(cmdbuf))
1244                 {
1245                    cprintf("%d Unrecognized or unsupported command.\n",
1246                             ERROR);
1247                 }
1248
1249         /* Run any after-each-command outines registered by modules */
1250         PerformSessionHooks(EVT_CMD);
1251 }