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