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/socket.h>
  17 #include <netinet/in.h>
  18 #include <arpa/inet.h>
  19 #include "citadel.h"
  20 #include "server.h"
  21 #include "sysdep_decls.h"
  22 #include "citserver.h"
  23 #include "config.h"
  24 #include "database.h"
  25 #include "housekeeping.h"
  26 #include "user_ops.h"
  27 #include "logging.h"
  28 #include "msgbase.h"
  29 #include "support.h"
  30 #include "locate_host.h"
  31 #include "room_ops.h"
  32 #include "file_ops.h"
  33 #include "dynloader.h"
  34 #include "policy.h"
  35 #include "control.h"
  36 #include "tools.h"
  37
  38 struct CitContext *ContextList = NULL;
  39 char *unique_session_numbers;
  40 int ScheduledShutdown = 0;
  41 int do_defrag = 0;
  42
  43 /*
  44  * Various things that need to be initialized at startup
  45  */
  46 void master_startup(void) {
  47         lprintf(7, "Opening databases\n");
  48         open_databases();
  49
  50         if (do_defrag)
  51                 defrag_databases();
  52
  53         lprintf(7, "Checking floor reference counts\n");
  54         check_ref_counts();
  55
  56         lprintf(7, "Creating base rooms (if necessary)\n");
  57         create_room(BASEROOM, 0, "", 0);
  58         create_room(AIDEROOM, 4, "", 0);
  59         create_room(config.c_twitroom, 0, "", 0);
  60         }
  61
  62 /*
  63  * Cleanup routine to be called when the server is shutting down.
  64  */
  65 void master_cleanup(void) {
  66         struct CleanupFunctionHook *fcn;
  67
  68         /* Cancel all running sessions */
  69         lprintf(7, "Cancelling running sessions...\n");
  70
  71 /* FIX do something here
  72         while (ContextList != NULL) {
  73                 }
  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  * Terminate a session and remove its context data structure.
 120  */
 121 void RemoveContext (struct CitContext *con)
 122 {
 123         struct CitContext *ptr = NULL;
 124         struct CitContext *ToFree = NULL;
 125
 126         lprintf(9, "RemoveContext() called\n");
 127         if (con==NULL) {
 128                 lprintf(5, "WARNING: RemoveContext() called with NULL!\n");
 129                 return;
 130                 }
 131
 132         /* Remove the context from the global context list.  This needs
 133          * to get done FIRST to avoid concurrency problems.  It is *vitally*
 134          * important to keep num_sessions accurate!!
 135          */
 136         lprintf(7, "Removing context for session %d\n", con->cs_pid);
 137         begin_critical_section(S_SESSION_TABLE);
 138         if (ContextList == con) {
 139                 ToFree = ContextList;
 140                 ContextList = ContextList->next;
 141                 --num_sessions;
 142                 }
 143         else {
 144                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 145                         if (ptr->next == con) {
 146                                 ToFree = ptr->next;
 147                                 ptr->next = ptr->next->next;
 148                                 --num_sessions;
 149                                 }
 150                         }
 151                 }
 152         end_critical_section(S_SESSION_TABLE);
 153
 154         if (ToFree == NULL) {
 155                 lprintf(9, "RemoveContext() found nothing to remove\n");
 156                 return;
 157         }
 158
 159         /* Now handle all of the administrivia. */
 160         lprintf(7, "Calling logout(%d)\n", con->cs_pid);
 161         logout(con);
 162
 163         rec_log(CL_TERMINATE, con->curr_user);
 164         unlink(con->temp);
 165         lprintf(3, "citserver[%3d]: ended.\n", con->cs_pid);
 166
 167         /* Run any cleanup routines registered by loadable modules */
 168         PerformSessionHooks(EVT_STOP);
 169
 170         syslog(LOG_NOTICE,"session %d ended", con->cs_pid);
 171
 172         /* Deallocate any user-data attached to this session */
 173         deallocate_user_data(con);
 174
 175         /* If the client is still connected, blow 'em away. */
 176         lprintf(7, "Closing socket %d\n", con->client_socket);
 177         close(con->client_socket);
 178
 179         /* Tell the housekeeping thread to check to see if this is the time
 180          * to initiate a scheduled shutdown event.
 181          */
 182         enter_housekeeping_cmd("SCHED_SHUTDOWN");
 183
 184         /* Free up the memory used by this context */
 185         phree(con);
 186
 187         lprintf(7, "Done with RemoveContext()\n");
 188 }
 189
 190
 191
 192 /*
 193  * Get a dynamic symbol number for per-session user data.
 194  * This API call should be made only ONCE per symbol per citserver run.
 195  */
 196 int CtdlGetDynamicSymbol()
 197 {
 198         static unsigned int next_symbol = SYM_MAX;
 199         return ++next_symbol;
 200 }
 201
 202
 203
 204 /*
 205  * Return a pointer to some generic per-session user data.
 206  * (This function returns NULL if the requested symbol is not allocated.)
 207  *
 208  * NOTE: we use critical sections for allocating and de-allocating these,
 209  *       but not for locating one.
 210  */
 211 void *CtdlGetUserData(unsigned long requested_sym)
 212 {
 213         struct CtdlSessData *ptr;
 214
 215         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 216                 if (ptr->sym_id == requested_sym)
 217                         return(ptr->sym_data);
 218
 219         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 220                 requested_sym);
 221         return NULL;
 222 }
 223
 224
 225 /*
 226  * Allocate some generic per-session user data.
 227  */
 228 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 229 {
 230         struct CtdlSessData *ptr;
 231
 232         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 233
 234         /* Fail silently if the symbol is already registered. */
 235         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 236                 if (ptr->sym_id == requested_sym) {
 237                         return;
 238                 }
 239         }
 240
 241         /* Grab us some memory!  Dem's good eatin' !!  */
 242         ptr = mallok(sizeof(struct CtdlSessData));
 243         ptr->sym_id = requested_sym;
 244         ptr->sym_data = mallok(num_bytes);
 245
 246         begin_critical_section(S_SESSION_TABLE);
 247         ptr->next = CC->FirstSessData;
 248         CC->FirstSessData = ptr;
 249         end_critical_section(S_SESSION_TABLE);
 250
 251         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 252 }
 253
 254
 255
 256
 257
 258
 259 /*
 260  * cmd_info()  -  tell the client about this server
 261  */
 262 void cmd_info(void) {
 263         cprintf("%d Server info:\n",LISTING_FOLLOWS);
 264         cprintf("%d\n",CC->cs_pid);
 265         cprintf("%s\n",config.c_nodename);
 266         cprintf("%s\n",config.c_humannode);
 267         cprintf("%s\n",config.c_fqdn);
 268         cprintf("%s\n",CITADEL);
 269         cprintf("%d\n",REV_LEVEL);
 270         cprintf("%s\n",config.c_bbs_city);
 271         cprintf("%s\n",config.c_sysadm);
 272         cprintf("%d\n",SERVER_TYPE);
 273         cprintf("%s\n",config.c_moreprompt);
 274         cprintf("1\n"); /* 1 = yes, this system supports floors */
 275         cprintf("1\n"); /* 1 = we support the extended paging options */
 276         cprintf("000\n");
 277         }
 278
 279 void cmd_rchg(char *argbuf)
 280 {
 281         char newroomname[256];
 282
 283         extract(newroomname, argbuf, 0);
 284         newroomname[ROOMNAMELEN-1] = 0;
 285         if (strlen(newroomname) > 0) {
 286                 safestrncpy(CC->fake_roomname, newroomname,
 287                         sizeof(CC->fake_roomname) );
 288                 }
 289         else {
 290                 strcpy(CC->fake_roomname, "");
 291                 }
 292         cprintf("%d OK\n", OK);
 293 }
 294
 295 void cmd_hchg(char *argbuf)
 296 {
 297         char newhostname[256];
 298
 299         extract(newhostname, argbuf, 0);
 300         if (strlen(newhostname) > 0) {
 301                 safestrncpy(CC->fake_hostname, newhostname,
 302                         sizeof(CC->fake_hostname) );
 303                 }
 304         else {
 305                 strcpy(CC->fake_hostname, "");
 306                 }
 307         cprintf("%d OK\n", OK);
 308 }
 309
 310 void cmd_uchg(char *argbuf)
 311 {
 312
 313         char newusername[256];
 314
 315         extract(newusername, argbuf, 0);
 316
 317         if (CC->usersupp.axlevel < 6) {
 318                 cprintf("%d You must be an Aide to masquerade your name.\n",
 319                         ERROR+HIGHER_ACCESS_REQUIRED);
 320                 return;
 321         }
 322
 323         if (strlen(newusername) > 0) {
 324                 CC->cs_flags &= ~CS_STEALTH;
 325                 memset(CC->fake_username, 0, 32);
 326                 if (strncasecmp(newusername, CC->curr_user,
 327                                 strlen(CC->curr_user)))
 328                         safestrncpy(CC->fake_username, newusername,
 329                                 sizeof(CC->fake_username));
 330         }
 331         else {
 332                 CC->fake_username[0] = '\0';
 333                 CC->cs_flags |= CS_STEALTH;
 334         }
 335         cprintf("%d\n",OK);
 336 }
 337
 338
 339
 340 /*
 341  * returns an asterisk if there are any express messages waiting,
 342  * space otherwise.
 343  */
 344 char check_express(void) {
 345         if (CC->FirstExpressMessage == NULL) {
 346                 return(' ');
 347                 }
 348         else {
 349                 return('*');
 350                 }
 351         }
 352
 353 void cmd_time(void)
 354 {
 355    time_t tv;
 356
 357    tv = time(NULL);
 358
 359    cprintf("%d %ld\n", OK, tv);
 360 }
 361
 362 /*
 363  * Check whether two hostnames match.
 364  * "Realname" should be an actual name of a client that is trying to connect;
 365  * "testname" should be the value we are comparing it with. The idea is that we
 366  * want to compare with both the abbreviated and fully-qualified versions of
 367  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 368  */
 369 static int hostnames_match(const char *realname, const char *testname) {
 370         struct hostent *he;
 371         int retval = 0;
 372
 373         if (!strcasecmp(realname, testname))
 374                 return 1;
 375
 376 #ifdef HAVE_NONREENTRANT_NETDB
 377         begin_critical_section(S_NETDB);
 378 #endif
 379
 380         if ((he = gethostbyname(testname)) != NULL)
 381                 if (!strcasecmp(realname, he->h_name))
 382                         retval = 1;
 383
 384 #ifdef HAVE_NONREENTRANT_NETDB
 385         end_critical_section(S_NETDB);
 386 #endif
 387
 388         return retval;
 389         }
 390
 391 /*
 392  * check a hostname against the public_clients file
 393  */
 394 int is_public_client(char *where)
 395 {
 396         char buf[256];
 397         FILE *fp;
 398
 399         if (hostnames_match(where,"localhost")) return(1);
 400         if (hostnames_match(where,config.c_fqdn)) return(1);
 401
 402         fp = fopen("public_clients","r");
 403         if (fp == NULL) return(0);
 404
 405         while (fgets(buf,256,fp)!=NULL) {
 406                 while (isspace((buf[strlen(buf)-1])))
 407                         buf[strlen(buf)-1] = 0;
 408                 if (hostnames_match(where,buf)) {
 409                         fclose(fp);
 410                         return(1);
 411                         }
 412                 }
 413
 414         fclose(fp);
 415         return(0);
 416         }
 417
 418
 419 /*
 420  * the client is identifying itself to the server
 421  */
 422 void cmd_iden(char *argbuf)
 423 {
 424         int dev_code;
 425         int cli_code;
 426         int rev_level;
 427         char desc[256];
 428         char from_host[256];
 429         struct in_addr addr;
 430
 431         if (num_parms(argbuf)<4) {
 432                 cprintf("%d usage error\n",ERROR);
 433                 return;
 434                 }
 435
 436         dev_code = extract_int(argbuf,0);
 437         cli_code = extract_int(argbuf,1);
 438         rev_level = extract_int(argbuf,2);
 439         extract(desc,argbuf,3);
 440
 441         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 442         from_host[sizeof from_host - 1] = 0;
 443         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 444
 445         CC->cs_clientdev = dev_code;
 446         CC->cs_clienttyp = cli_code;
 447         CC->cs_clientver = rev_level;
 448         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 449         CC->cs_clientname[31] = 0;
 450
 451         lprintf(9, "Looking up hostname '%s'\n", from_host);
 452         if ((strlen(from_host)>0) &&
 453            (is_public_client(CC->cs_host))) {
 454                 if (inet_aton(from_host, &addr))
 455                         locate_host(CC->cs_host, &addr);
 456                 else {
 457                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 458                         CC->cs_host[24] = 0;
 459                         }
 460                 }
 461
 462         syslog(LOG_NOTICE,"client %d/%d/%01d.%02d (%s)\n",
 463                 dev_code,
 464                 cli_code,
 465                 (rev_level / 100),
 466                 (rev_level % 100),
 467                 desc);
 468                 cprintf("%d Ok\n",OK);
 469         }
 470
 471
 472 /*
 473  * enter or exit "stealth mode"
 474  */
 475 void cmd_stel(char *cmdbuf)
 476 {
 477         int requested_mode;
 478
 479         requested_mode = extract_int(cmdbuf,0);
 480         if (requested_mode !=0) requested_mode = 1;
 481
 482         if (!CC->logged_in) {
 483                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 484                 return;
 485                 }
 486
 487         if (CC->usersupp.axlevel < 6) {
 488                 cprintf("%d You must be an Aide to use stealth mode.\n",
 489                         ERROR+HIGHER_ACCESS_REQUIRED);
 490                 return;
 491                 }
 492
 493         if (CC->cs_flags & CS_STEALTH) {
 494                 if (requested_mode == 0)
 495                         CC->cs_flags = CC->cs_flags-CS_STEALTH;
 496                 }
 497         else {
 498                 if (requested_mode == 1)
 499                         CC->cs_flags = CC->cs_flags|CS_STEALTH;
 500                 }
 501
 502         cprintf("%d Ok\n",OK);
 503         }
 504
 505
 506
 507
 508 /*
 509  * display system messages or help
 510  */
 511 void cmd_mesg(char *mname)
 512 {
 513         FILE *mfp;
 514         char targ[256];
 515         char buf[256];
 516         char *dirs[2];
 517
 518         extract(buf,mname,0);
 519
 520
 521         dirs[0]=mallok(64);
 522         dirs[1]=mallok(64);
 523         strcpy(dirs[0],"messages");
 524         strcpy(dirs[1],"help");
 525         mesg_locate(targ,buf,2,dirs);
 526         phree(dirs[0]);
 527         phree(dirs[1]);
 528
 529
 530         if (strlen(targ)==0) {
 531                 cprintf("%d '%s' not found.\n",ERROR,mname);
 532                 return;
 533                 }
 534
 535         mfp = fopen(targ,"r");
 536         if (mfp==NULL) {
 537                 cprintf("%d Cannot open '%s': %s\n",
 538                         ERROR,targ,strerror(errno));
 539                 return;
 540                 }
 541         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 542
 543         while (fgets(buf,255,mfp)!=NULL) {
 544                 buf[strlen(buf)-1] = 0;
 545                 do_help_subst(buf);
 546                 cprintf("%s\n",buf);
 547                 }
 548
 549         fclose(mfp);
 550         cprintf("000\n");
 551         }
 552
 553
 554 /*
 555  * enter system messages or help
 556  */
 557 void cmd_emsg(char *mname)
 558 {
 559         FILE *mfp;
 560         char targ[256];
 561         char buf[256];
 562         char *dirs[2];
 563         int a;
 564
 565         if (CC->usersupp.axlevel < 6) {
 566                 cprintf("%d You must be an Aide to edit system messages.\n",
 567                         ERROR+HIGHER_ACCESS_REQUIRED);
 568                 return;
 569                 }
 570
 571         extract(buf,mname,0);
 572         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 573                 if (buf[a] == '/') buf[a] = '.';
 574                 }
 575
 576         dirs[0]=mallok(64);
 577         dirs[1]=mallok(64);
 578         strcpy(dirs[0],"messages");
 579         strcpy(dirs[1],"help");
 580         mesg_locate(targ,buf,2,dirs);
 581         phree(dirs[0]);
 582         phree(dirs[1]);
 583
 584         if (strlen(targ)==0) {
 585                 snprintf(targ, sizeof targ, "./help/%s", buf);
 586                 }
 587
 588         mfp = fopen(targ,"w");
 589         if (mfp==NULL) {
 590                 cprintf("%d Cannot open '%s': %s\n",
 591                         ERROR,targ,strerror(errno));
 592                 return;
 593                 }
 594         cprintf("%d %s\n", SEND_LISTING, targ);
 595
 596         while (client_gets(buf), strcmp(buf, "000")) {
 597                 fprintf(mfp, "%s\n", buf);
 598                 }
 599
 600         fclose(mfp);
 601         }
 602
 603
 604 /* Don't show the names of private rooms unless the viewing
 605  * user also knows the rooms.
 606  */
 607 void GenerateRoomDisplay(char *real_room,
 608                         struct CitContext *viewed,
 609                         struct CitContext *viewer) {
 610
 611         strcpy(real_room, viewed->quickroom.QRname);
 612         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 613                 strcpy(real_room, &real_room[11]);
 614         }
 615         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 616                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 617                    & UA_KNOWN) == 0) {
 618                         strcpy(real_room, "<private room>");
 619                 }
 620         }
 621
 622         if (viewed->cs_flags & CS_CHAT) {
 623                 while (strlen(real_room) < 14)
 624                         strcat(real_room, " ");
 625
 626                 strcpy(&real_room[14], "<chat>");
 627         }
 628
 629 }
 630
 631
 632 /*
 633  * who's online
 634  */
 635 void cmd_rwho(void) {
 636         struct CitContext *cptr;
 637         int spoofed = 0;
 638         int aide;
 639         char un[40];
 640         char real_room[ROOMNAMELEN], room[ROOMNAMELEN];
 641         char host[40], flags[5];
 642
 643         aide = CC->usersupp.axlevel >= 6;
 644         cprintf("%d%c \n", LISTING_FOLLOWS, check_express() );
 645
 646         for (cptr = ContextList; cptr != NULL; cptr = cptr->next)
 647         {
 648                 flags[0] = '\0';
 649                 spoofed = 0;
 650
 651                 if (cptr->cs_flags & CS_POSTING)
 652                    strcat(flags, "*");
 653                 else
 654                    strcat(flags, ".");
 655
 656                 if (cptr->fake_username[0])
 657                 {
 658                    strcpy(un, cptr->fake_username);
 659                    spoofed = 1;
 660                 }
 661                 else
 662                    strcpy(un, cptr->curr_user);
 663
 664                 if (cptr->fake_hostname[0])
 665                 {
 666                    strcpy(host, cptr->fake_hostname);
 667                    spoofed = 1;
 668                 }
 669                 else
 670                    strcpy(host, cptr->cs_host);
 671
 672                 GenerateRoomDisplay(real_room, cptr, CC);
 673
 674                 if (cptr->fake_roomname[0]) {
 675                         strcpy(room, cptr->fake_roomname);
 676                         spoofed = 1;
 677                 }
 678                 else {
 679                         strcpy(room, real_room);
 680                 }
 681
 682                 if ((aide) && (spoofed))
 683                    strcat(flags, "+");
 684
 685                 if ((cptr->cs_flags & CS_STEALTH) && (aide))
 686                    strcat(flags, "-");
 687
 688                 if (((cptr->cs_flags&CS_STEALTH)==0) || (aide))
 689                 {
 690                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 691                                 cptr->cs_pid, un, room,
 692                                 host, cptr->cs_clientname,
 693                                 (long)(cptr->lastidle),
 694                                 cptr->lastcmdname, flags);
 695                 }
 696                 if ((spoofed) && (aide))
 697                 {
 698                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 699                                 cptr->cs_pid, cptr->curr_user,
 700                                 real_room,
 701                                 cptr->cs_host, cptr->cs_clientname,
 702                                 (long)(cptr->lastidle),
 703                                 cptr->lastcmdname, flags);
 704
 705                 }
 706         }
 707
 708         /* Now it's magic time.  Before we finish, call any EVT_RWHO hooks
 709          * so that external paging modules such as serv_icq can add more
 710          * content to the Wholist.
 711          */
 712         PerformSessionHooks(EVT_RWHO);
 713         cprintf("000\n");
 714         }
 715
 716
 717 /*
 718  * Terminate another running session
 719  */
 720 void cmd_term(char *cmdbuf)
 721 {
 722         int session_num;
 723         struct CitContext *ccptr;
 724         int found_it = 0;
 725
 726         if (!CC->logged_in) {
 727                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 728                 return;
 729                 }
 730
 731         if (CC->usersupp.axlevel < 6) {
 732                 cprintf("%d You must be an Aide to terminate sessions.\n",
 733                         ERROR+HIGHER_ACCESS_REQUIRED);
 734                 return;
 735                 }
 736
 737         session_num = extract_int(cmdbuf, 0);
 738         if (session_num == CC->cs_pid) {
 739                 cprintf("%d You can't kill your own session.\n", ERROR);
 740                 return;
 741                 }
 742
 743         lprintf(9, "Locating session to kill\n");
 744         begin_critical_section(S_SESSION_TABLE);
 745         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 746                 if (session_num == ccptr->cs_pid) {
 747                         ccptr->kill_me = 1;
 748                         found_it = 1;
 749                         }
 750                 }
 751         end_critical_section(S_SESSION_TABLE);
 752
 753         if (found_it) {
 754                 cprintf("%d Session terminated.\n", OK);
 755                 }
 756         else {
 757                 cprintf("%d No such session.\n", ERROR);
 758                 }
 759         }
 760
 761
 762
 763
 764
 765 /*
 766  * get the paginator prompt
 767  */
 768 void cmd_more(void) {
 769         cprintf("%d %s\n",OK,config.c_moreprompt);
 770         }
 771
 772 /*
 773  * echo
 774  */
 775 void cmd_echo(char *etext)
 776 {
 777         cprintf("%d %s\n",OK,etext);
 778         }
 779
 780
 781
 782 /*
 783  * identify as internal program
 784  */
 785 void cmd_ipgm(char *argbuf)
 786 {
 787         int secret;
 788
 789         secret = extract_int(argbuf, 0);
 790         if (secret == config.c_ipgm_secret) {
 791                 CC->internal_pgm = 1;
 792                 strcpy(CC->curr_user, "<internal program>");
 793                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 794                 cprintf("%d Authenticated as an internal program.\n",OK);
 795                 }
 796         else {
 797                 cprintf("%d Authentication failed.\n",ERROR);
 798                 lprintf(3, "Warning: ipgm authentication failed.\n");
 799                 }
 800         }
 801
 802
 803 /*
 804  * Shut down the server
 805  */
 806 void cmd_down(void) {
 807         if (!CC->logged_in) {
 808                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 809                 return;
 810                 }
 811
 812         if (CC->usersupp.axlevel < 6) {
 813                 cprintf("%d You must be an Aide to shut down the server.\n",
 814                         ERROR+HIGHER_ACCESS_REQUIRED);
 815                 return;
 816                 }
 817
 818         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 819         master_cleanup();
 820         }
 821
 822 /*
 823  * Schedule or cancel a server shutdown
 824  */
 825 void cmd_scdn(char *argbuf)
 826 {
 827         int new_state;
 828
 829         if (!CC->logged_in) {
 830                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 831                 return;
 832                 }
 833
 834         if (CC->usersupp.axlevel < 6) {
 835                 cprintf("%d You must be an Aide to schedule a shutdown.\n",
 836                         ERROR+HIGHER_ACCESS_REQUIRED);
 837                 return;
 838                 }
 839
 840         new_state = extract_int(argbuf, 0);
 841         if ((new_state == 0) || (new_state == 1)) {
 842                 ScheduledShutdown = new_state;
 843                 }
 844         cprintf("%d %d\n", OK, ScheduledShutdown);
 845         }
 846
 847
 848 /*
 849  *
 850  */
 851 void begin_session(struct CitContext *con)
 852 {
 853         int len;
 854         struct sockaddr_in sin;
 855
 856         /*
 857          * Initialize some variables specific to our context.
 858          */
 859         con->logged_in = 0;
 860         con->internal_pgm = 0;
 861         con->download_fp = NULL;
 862         con->upload_fp = NULL;
 863         con->FirstExpressMessage = NULL;
 864         time(&con->lastcmd);
 865         time(&con->lastidle);
 866         strcpy(con->lastcmdname, "    ");
 867         strcpy(con->cs_clientname, "(unknown)");
 868         strcpy(con->curr_user,"(not logged in)");
 869         strcpy(con->net_node,"");
 870         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 871         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 872         con->cs_host[sizeof con->cs_host - 1] = 0;
 873         len = sizeof sin;
 874         if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len))
 875                 locate_host(con->cs_host, &sin.sin_addr);
 876         con->cs_flags = 0;
 877         con->upload_type = UPL_FILE;
 878         con->dl_is_net = 0;
 879         con->FirstSessData = NULL;
 880
 881         con->nologin = 0;
 882         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 883                 con->nologin = 1;
 884
 885         if (con->nologin==1) {
 886                 cprintf("%d %s: Too many users are already online "
 887                         "(maximum is %d)\n",
 888                         ERROR+MAX_SESSIONS_EXCEEDED,
 889                         config.c_nodename, config.c_maxsessions);
 890                 }
 891         else {
 892                 cprintf("%d %s Citadel/UX server ready.\n",
 893                         OK, config.c_nodename);
 894                 }
 895
 896         lprintf(3, "citserver[%3d]: started.\n", con->cs_pid);
 897
 898         /* Run any session startup routines registered by loadable modules */
 899         PerformSessionHooks(EVT_START);
 900
 901         rec_log(CL_CONNECT, "");
 902 }
 903
 904
 905
 906
 907 /*
 908  * This loop recognizes all server commands.
 909  */
 910 void do_command_loop(void) {
 911         char cmdbuf[256];
 912
 913         time(&CC->lastcmd);
 914         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 915         if (client_gets(cmdbuf) < 1) {
 916                 lprintf(3, "Client socket is broken.  Ending session.\n");
 917                 CC->kill_me = 1;
 918                 return;
 919         }
 920         lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 921
 922         /*
 923          * Let other clients see the last command we executed, and
 924          * update the idle time, but not NOOP, PEXP, or GEXP.
 925          */
 926         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 927            && (strncasecmp(cmdbuf, "PEXP", 4))
 928            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 929                 strcpy(CC->lastcmdname, "    ");
 930                 safestrncpy(CC->lastcmdname, cmdbuf,
 931                         sizeof(CC->lastcmdname) );
 932                 time(&CC->lastidle);
 933                 }
 934
 935         if ((strncasecmp(cmdbuf, "ENT0", 4))
 936            && (strncasecmp(cmdbuf, "MESG", 4))
 937            && (strncasecmp(cmdbuf, "MSGS", 4)))
 938         {
 939            CC->cs_flags &= ~CS_POSTING;
 940         }
 941
 942         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 943                 cprintf("%d%cok\n",OK,check_express());
 944                 }
 945
 946         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 947                 cprintf("%d Goodbye.\n",OK);
 948                 CC->kill_me = 1;
 949                 }
 950
 951         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 952                 if (CC->logged_in) logout(CC);
 953                 cprintf("%d logged out.\n",OK);
 954                 }
 955
 956         else if (!strncasecmp(cmdbuf,"USER",4)) {
 957                 cmd_user(&cmdbuf[5]);
 958                 }
 959
 960         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 961                 cmd_pass(&cmdbuf[5]);
 962                 }
 963
 964         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 965                 cmd_newu(&cmdbuf[5]);
 966                 }
 967
 968         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 969                 cmd_setp(&cmdbuf[5]);
 970                 }
 971
 972         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 973                 cmd_lrms(&cmdbuf[5]);
 974                 }
 975
 976         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 977                 cmd_lkra(&cmdbuf[5]);
 978                 }
 979
 980         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 981                 cmd_lkrn(&cmdbuf[5]);
 982                 }
 983
 984         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 985                 cmd_lkro(&cmdbuf[5]);
 986                 }
 987
 988         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 989                 cmd_lzrm(&cmdbuf[5]);
 990                 }
 991
 992         else if (!strncasecmp(cmdbuf,"GETU",4)) {
 993                 cmd_getu();
 994                 }
 995
 996         else if (!strncasecmp(cmdbuf,"SETU",4)) {
 997                 cmd_setu(&cmdbuf[5]);
 998                 }
 999
1000         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1001                 cmd_goto(&cmdbuf[5]);
1002                 }
1003
1004         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1005                 cmd_msgs(&cmdbuf[5]);
1006                 }
1007
1008         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1009                 cmd_whok();
1010                 }
1011
1012         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1013                 cmd_rdir();
1014                 }
1015
1016         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1017                 cmd_msg0(&cmdbuf[5]);
1018                 }
1019
1020         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1021                 cmd_msg2(&cmdbuf[5]);
1022                 }
1023
1024         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1025                 cmd_msg3(&cmdbuf[5]);
1026                 }
1027
1028         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1029                 cmd_msg4(&cmdbuf[5]);
1030                 }
1031
1032         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1033                 cmd_opna(&cmdbuf[5]);
1034                 }
1035
1036         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1037                 cmd_info();
1038                 }
1039
1040         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1041                 cmd_slrp(&cmdbuf[5]);
1042                 }
1043
1044         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1045                 cmd_invt_kick(&cmdbuf[5],1);
1046                 }
1047
1048         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1049                 cmd_invt_kick(&cmdbuf[5],0);
1050                 }
1051
1052         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1053                 cmd_getr();
1054                 }
1055
1056         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1057                 cmd_setr(&cmdbuf[5]);
1058                 }
1059
1060         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1061                 cmd_geta();
1062                 }
1063
1064         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1065                 cmd_seta(&cmdbuf[5]);
1066                 }
1067
1068         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1069                 cmd_ent0(&cmdbuf[5]);
1070                 }
1071
1072         else if (!strncasecmp(cmdbuf,"ENT3",4)) {
1073                 cmd_ent3(&cmdbuf[5]);
1074                 }
1075
1076         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1077                 cmd_rinf();
1078                 }
1079
1080         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1081                 cmd_dele(&cmdbuf[5]);
1082                 }
1083
1084         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1085                 cmd_kill(&cmdbuf[5]);
1086                 }
1087
1088         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1089                 cmd_cre8(&cmdbuf[5]);
1090                 }
1091
1092         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1093                 cmd_move(&cmdbuf[5]);
1094                 }
1095
1096         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1097                 cmd_forg();
1098                 }
1099
1100         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1101                 cmd_mesg(&cmdbuf[5]);
1102                 }
1103
1104         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1105                 cmd_emsg(&cmdbuf[5]);
1106                 }
1107
1108         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1109                 cmd_gnur();
1110                 }
1111
1112         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1113                 cmd_vali(&cmdbuf[5]);
1114                 }
1115
1116         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1117                 cmd_einf(&cmdbuf[5]);
1118                 }
1119
1120         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1121                 cmd_list();
1122                 }
1123
1124         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1125                 cmd_chek();
1126                 }
1127
1128         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1129                 cmd_delf(&cmdbuf[5]);
1130                 }
1131
1132         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1133                 cmd_movf(&cmdbuf[5]);
1134                 }
1135
1136         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1137                 cmd_netf(&cmdbuf[5]);
1138                 }
1139
1140         else if (!strncasecmp(cmdbuf,"RWHO",4)) {
1141                 cmd_rwho();
1142                 }
1143
1144         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1145                 cmd_open(&cmdbuf[5]);
1146                 }
1147
1148         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1149                 cmd_clos();
1150                 }
1151
1152         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1153                 cmd_uopn(&cmdbuf[5]);
1154                 }
1155
1156         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1157                 cmd_ucls(&cmdbuf[5]);
1158                 }
1159
1160         else if (!strncasecmp(cmdbuf,"READ",4)) {
1161                 cmd_read(&cmdbuf[5]);
1162                 }
1163
1164         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1165                 cmd_writ(&cmdbuf[5]);
1166                 }
1167
1168         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1169                 cmd_qusr(&cmdbuf[5]);
1170                 }
1171
1172         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1173                 cmd_echo(&cmdbuf[5]);
1174                 }
1175
1176         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1177                 cmd_oimg(&cmdbuf[5]);
1178                 }
1179
1180         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1181                 cmd_more();
1182                 }
1183
1184         else if (!strncasecmp(cmdbuf,"NETP",4)) {
1185                 cmd_netp(&cmdbuf[5]);
1186                 }
1187
1188         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1189                 cmd_ndop(&cmdbuf[5]);
1190                 }
1191
1192         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1193                 cmd_nuop(&cmdbuf[5]);
1194                 }
1195
1196         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1197                 cmd_lflr();
1198                 }
1199
1200         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1201                 cmd_cflr(&cmdbuf[5]);
1202                 }
1203
1204         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1205                 cmd_kflr(&cmdbuf[5]);
1206                 }
1207
1208         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1209                 cmd_eflr(&cmdbuf[5]);
1210                 }
1211
1212         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1213                 cmd_iden(&cmdbuf[5]);
1214                 }
1215
1216         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1217                 cmd_ipgm(&cmdbuf[5]);
1218                 }
1219
1220         else if (!strncasecmp(cmdbuf,"EBIO",4)) {
1221                 cmd_ebio();
1222                 }
1223
1224         else if (!strncasecmp(cmdbuf,"RBIO",4)) {
1225                 cmd_rbio(&cmdbuf[5]);
1226                 }
1227
1228         else if (!strncasecmp(cmdbuf,"LBIO",4)) {
1229                 cmd_lbio();
1230                 }
1231
1232         else if (!strncasecmp(cmdbuf,"STEL",4)) {
1233                 cmd_stel(&cmdbuf[5]);
1234                 }
1235
1236         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1237                 cmd_term(&cmdbuf[5]);
1238                 }
1239
1240         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1241                 cmd_down();
1242                 }
1243
1244         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1245                 cmd_scdn(&cmdbuf[5]);
1246                 }
1247
1248         else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1249                 cmd_nset(&cmdbuf[5]);
1250                 }
1251
1252         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1253                 cmd_uimg(&cmdbuf[5]);
1254                 }
1255
1256         else if (!strncasecmp(cmdbuf, "UCHG", 4)) {
1257                 cmd_uchg(&cmdbuf[5]);
1258                 }
1259
1260         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1261                 cmd_time();
1262                 }
1263
1264         else if (!strncasecmp(cmdbuf, "HCHG", 4)) {
1265                 cmd_hchg(&cmdbuf[5]);
1266                 }
1267
1268         else if (!strncasecmp(cmdbuf, "RCHG", 4)) {
1269                 cmd_rchg(&cmdbuf[5]);
1270                 }
1271
1272         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1273                 cmd_agup(&cmdbuf[5]);
1274                 }
1275
1276         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1277                 cmd_asup(&cmdbuf[5]);
1278                 }
1279
1280         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1281                 cmd_gpex(&cmdbuf[5]);
1282                 }
1283
1284         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1285                 cmd_spex(&cmdbuf[5]);
1286                 }
1287
1288         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1289                 cmd_conf(&cmdbuf[5]);
1290                 }
1291
1292 #ifdef DEBUG_MEMORY_LEAKS
1293         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1294                 dump_tracked();
1295                 }
1296 #endif
1297
1298         else if (!DLoader_Exec_Cmd(cmdbuf))
1299                 {
1300                    cprintf("%d Unrecognized or unsupported command.\n",
1301                             ERROR);
1302                 }
1303
1304         /* Run any after-each-command outines registered by modules */
1305         PerformSessionHooks(EVT_CMD);
1306 }