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 int ScheduledShutdown = 0;
  40 int do_defrag = 0;
  41
  42 /*
  43  * Various things that need to be initialized at startup
  44  */
  45 void master_startup(void) {
  46         lprintf(7, "Opening databases\n");
  47         open_databases();
  48
  49         if (do_defrag)
  50                 defrag_databases();
  51
  52         lprintf(7, "Checking floor reference counts\n");
  53         check_ref_counts();
  54
  55         lprintf(7, "Creating base rooms (if necessary)\n");
  56         create_room(BASEROOM, 0, "", 0);
  57         create_room(AIDEROOM, 4, "", 0);
  58         create_room(config.c_twitroom, 0, "", 0);
  59         }
  60
  61 /*
  62  * Cleanup routine to be called when the server is shutting down.
  63  */
  64 void master_cleanup(void) {
  65         struct CleanupFunctionHook *fcn;
  66
  67         /* Cancel all running sessions */
  68         lprintf(7, "Cancelling running sessions...\n");
  69         while (ContextList != NULL) {
  70                 kill_session(ContextList->cs_pid);
  71                 }
  72
  73         /* Run any cleanup routines registered by loadable modules */
  74         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
  75                 (*fcn->h_function_pointer)();
  76                 }
  77
  78         /* Close databases */
  79         lprintf(7, "Closing databases\n");
  80         close_databases();
  81
  82         /* Do system-dependent stuff */
  83         sysdep_master_cleanup();
  84
  85         /* Now go away. */
  86         lprintf(3, "citserver: exiting.\n");
  87         fflush(stdout); fflush(stderr);
  88         exit(0);
  89         }
  90
  91
  92 /*
  93  * Free any per-session data allocated by modules or whatever
  94  */
  95 void deallocate_user_data(struct CitContext *con)
  96 {
  97         struct CtdlSessData *ptr;
  98
  99         begin_critical_section(S_SESSION_TABLE);
 100         while (con->FirstSessData != NULL) {
 101                 lprintf(9, "Deallocating user data symbol %ld\n",
 102                         con->FirstSessData->sym_id);
 103                 if (con->FirstSessData->sym_data != NULL)
 104                         phree(con->FirstSessData->sym_data);
 105                 ptr = con->FirstSessData->next;
 106                 phree(con->FirstSessData);
 107                 con->FirstSessData = ptr;
 108         }
 109         end_critical_section(S_SESSION_TABLE);
 110 }
 111
 112
 113
 114
 115 /*
 116  * Gracefully terminate a session which is marked as CON_DYING.
 117  */
 118 void cleanup(struct CitContext *con)
 119 {
 120         struct CitContext *ptr = NULL;
 121         struct CitContext *ToFree = NULL;
 122
 123         lprintf(9, "cleanup() called\n");
 124         if (con==NULL) {
 125                 lprintf(5, "WARNING: cleanup() called with NULL!\n");
 126                 return;
 127                 }
 128
 129         lprintf(7, "Calling logout(%d)\n", con->cs_pid);
 130         logout(con);
 131
 132         rec_log(CL_TERMINATE, con->curr_user);
 133         unlink(con->temp);
 134         lprintf(3, "citserver[%3d]: ended.\n", con->cs_pid);
 135
 136         /* Run any cleanup routines registered by loadable modules */
 137         PerformSessionHooks(EVT_STOP);
 138
 139         syslog(LOG_NOTICE,"session %d ended", con->cs_pid);
 140
 141         /* Deallocate any user-data attached to this session */
 142         deallocate_user_data(con);
 143
 144         /* And flag the context as in need of being killed.
 145          * (Probably done already, but just in case)
 146          */
 147         con->state = CON_DYING;
 148
 149         /* delete context */
 150
 151         lprintf(7, "Removing context\n");
 152
 153         begin_critical_section(S_SESSION_TABLE);
 154         if (ContextList == con) {
 155                 ToFree = ContextList;
 156                 ContextList = ContextList->next;
 157                 }
 158         else {
 159                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 160                         if (ptr->next == con) {
 161                                 ToFree = ptr->next;
 162                                 ptr->next = ptr->next->next;
 163                                 }
 164                         }
 165                 }
 166         end_critical_section(S_SESSION_TABLE);
 167
 168         lprintf(7, "Closing socket %d\n", ToFree->client_socket);
 169         close(ToFree->client_socket);
 170
 171         /* Tell the housekeeping thread to check to see if this is the time
 172          * to initiate a scheduled shutdown event.
 173          */
 174         enter_housekeeping_cmd("SCHED_SHUTDOWN");
 175
 176         /* Free up the memory used by this context */
 177         phree(ToFree);
 178
 179         lprintf(7, "Done with cleanup()\n");
 180 }
 181
 182
 183
 184 /*
 185  * Get a dynamic symbol number for per-session user data.
 186  * This API call should be made only ONCE per symbol per citserver run.
 187  */
 188 int CtdlGetDynamicSymbol()
 189 {
 190         static unsigned int next_symbol = SYM_MAX;
 191         return ++next_symbol;
 192 }
 193
 194
 195
 196 /*
 197  * Return a pointer to some generic per-session user data.
 198  * (This function returns NULL if the requested symbol is not allocated.)
 199  *
 200  * NOTE: we use critical sections for allocating and de-allocating these,
 201  *       but not for locating one.
 202  */
 203 void *CtdlGetUserData(unsigned long requested_sym)
 204 {
 205         struct CtdlSessData *ptr;
 206
 207         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 208                 if (ptr->sym_id == requested_sym)
 209                         return(ptr->sym_data);
 210
 211         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 212                 requested_sym);
 213         return NULL;
 214 }
 215
 216
 217 /*
 218  * Allocate some generic per-session user data.
 219  */
 220 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 221 {
 222         struct CtdlSessData *ptr;
 223
 224         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 225
 226         /* Fail silently if the symbol is already registered. */
 227         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 228                 if (ptr->sym_id == requested_sym) {
 229                         return;
 230                 }
 231         }
 232
 233         /* Grab us some memory!  Dem's good eatin' !!  */
 234         ptr = mallok(sizeof(struct CtdlSessData));
 235         ptr->sym_id = requested_sym;
 236         ptr->sym_data = mallok(num_bytes);
 237
 238         begin_critical_section(S_SESSION_TABLE);
 239         ptr->next = CC->FirstSessData;
 240         CC->FirstSessData = ptr;
 241         end_critical_section(S_SESSION_TABLE);
 242
 243         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 244 }
 245
 246
 247
 248
 249
 250
 251 /*
 252  * cmd_info()  -  tell the client about this server
 253  */
 254 void cmd_info(void) {
 255         cprintf("%d Server info:\n",LISTING_FOLLOWS);
 256         cprintf("%d\n",CC->cs_pid);
 257         cprintf("%s\n",config.c_nodename);
 258         cprintf("%s\n",config.c_humannode);
 259         cprintf("%s\n",config.c_fqdn);
 260         cprintf("%s\n",CITADEL);
 261         cprintf("%d\n",REV_LEVEL);
 262         cprintf("%s\n",config.c_bbs_city);
 263         cprintf("%s\n",config.c_sysadm);
 264         cprintf("%d\n",SERVER_TYPE);
 265         cprintf("%s\n",config.c_moreprompt);
 266         cprintf("1\n"); /* 1 = yes, this system supports floors */
 267         cprintf("1\n"); /* 1 = we support the extended paging options */
 268         cprintf("000\n");
 269         }
 270
 271 void cmd_rchg(char *argbuf)
 272 {
 273         char newroomname[ROOMNAMELEN];
 274
 275         extract(newroomname, argbuf, 0);
 276         newroomname[ROOMNAMELEN] = 0;
 277         if (strlen(newroomname) > 0) {
 278                 safestrncpy(CC->fake_roomname, newroomname,
 279                         sizeof(CC->fake_roomname) );
 280                 CC->fake_roomname[ROOMNAMELEN - 1] = 0;
 281                 }
 282         else {
 283                 strcpy(CC->fake_roomname, "");
 284                 }
 285         cprintf("%d OK\n", OK);
 286 }
 287
 288 void cmd_hchg(char *newhostname)
 289 {
 290    if ((newhostname) && (newhostname[0]))
 291    {
 292       memset(CC->fake_hostname, 0, 25);
 293       safestrncpy(CC->fake_hostname, newhostname, sizeof(CC->fake_hostname));
 294    }
 295    else
 296       strcpy(CC->fake_hostname, "");
 297    cprintf("%d OK\n",OK);
 298 }
 299
 300 void cmd_uchg(char *newusername)
 301 {
 302    if (CC->usersupp.axlevel < 6)
 303    {
 304       cprintf("%d You must be an Aide to use UCHG.\n",
 305                 ERROR+HIGHER_ACCESS_REQUIRED);
 306       return;
 307    }
 308    if ((newusername) && (newusername[0]))
 309    {
 310       CC->cs_flags &= ~CS_STEALTH;
 311       memset(CC->fake_username, 0, 32);
 312       if (strncasecmp(newusername, CC->curr_user, strlen(CC->curr_user)))
 313          safestrncpy(CC->fake_username, newusername, sizeof(CC->fake_username));
 314    }
 315    else
 316    {
 317       CC->fake_username[0] = '\0';
 318       CC->cs_flags |= CS_STEALTH;
 319    }
 320    cprintf("%d\n",OK);
 321 }
 322
 323 /*
 324  * returns an asterisk if there are any express messages waiting,
 325  * space otherwise.
 326  */
 327 char check_express(void) {
 328         if (CC->FirstExpressMessage == NULL) {
 329                 return(' ');
 330                 }
 331         else {
 332                 return('*');
 333                 }
 334         }
 335
 336 void cmd_time(void)
 337 {
 338    time_t tv;
 339
 340    tv = time(NULL);
 341
 342    cprintf("%d %ld\n", OK, tv);
 343 }
 344
 345 /*
 346  * Check whether two hostnames match.
 347  * "Realname" should be an actual name of a client that is trying to connect;
 348  * "testname" should be the value we are comparing it with. The idea is that we
 349  * want to compare with both the abbreviated and fully-qualified versions of
 350  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 351  */
 352 static int hostnames_match(const char *realname, const char *testname) {
 353         struct hostent *he;
 354         int retval = 0;
 355
 356         if (!strcasecmp(realname, testname))
 357                 return 1;
 358
 359 #ifdef HAVE_NONREENTRANT_NETDB
 360         begin_critical_section(S_NETDB);
 361 #endif
 362
 363         if ((he = gethostbyname(testname)) != NULL)
 364                 if (!strcasecmp(realname, he->h_name))
 365                         retval = 1;
 366
 367 #ifdef HAVE_NONREENTRANT_NETDB
 368         end_critical_section(S_NETDB);
 369 #endif
 370
 371         return retval;
 372         }
 373
 374 /*
 375  * check a hostname against the public_clients file
 376  */
 377 int is_public_client(char *where)
 378 {
 379         char buf[256];
 380         FILE *fp;
 381
 382         if (hostnames_match(where,"localhost")) return(1);
 383         if (hostnames_match(where,config.c_fqdn)) return(1);
 384
 385         fp = fopen("public_clients","r");
 386         if (fp == NULL) return(0);
 387
 388         while (fgets(buf,256,fp)!=NULL) {
 389                 while (isspace((buf[strlen(buf)-1])))
 390                         buf[strlen(buf)-1] = 0;
 391                 if (hostnames_match(where,buf)) {
 392                         fclose(fp);
 393                         return(1);
 394                         }
 395                 }
 396
 397         fclose(fp);
 398         return(0);
 399         }
 400
 401
 402 /*
 403  * the client is identifying itself to the server
 404  */
 405 void cmd_iden(char *argbuf)
 406 {
 407         int dev_code;
 408         int cli_code;
 409         int rev_level;
 410         char desc[256];
 411         char from_host[256];
 412         struct in_addr addr;
 413
 414         if (num_parms(argbuf)<4) {
 415                 cprintf("%d usage error\n",ERROR);
 416                 return;
 417                 }
 418
 419         dev_code = extract_int(argbuf,0);
 420         cli_code = extract_int(argbuf,1);
 421         rev_level = extract_int(argbuf,2);
 422         extract(desc,argbuf,3);
 423
 424         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 425         from_host[sizeof from_host - 1] = 0;
 426         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 427
 428         CC->cs_clientdev = dev_code;
 429         CC->cs_clienttyp = cli_code;
 430         CC->cs_clientver = rev_level;
 431         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 432         CC->cs_clientname[31] = 0;
 433
 434         lprintf(9, "Looking up hostname\n");
 435         if ((strlen(from_host)>0) &&
 436            (is_public_client(CC->cs_host))) {
 437                 if (inet_aton(from_host, &addr))
 438                         locate_host(CC->cs_host, &addr);
 439                 else {
 440                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 441                         CC->cs_host[24] = 0;
 442                         }
 443                 }
 444
 445         syslog(LOG_NOTICE,"client %d/%d/%01d.%02d (%s)\n",
 446                 dev_code,
 447                 cli_code,
 448                 (rev_level / 100),
 449                 (rev_level % 100),
 450                 desc);
 451                 cprintf("%d Ok\n",OK);
 452         }
 453
 454
 455 /*
 456  * enter or exit "stealth mode"
 457  */
 458 void cmd_stel(char *cmdbuf)
 459 {
 460         int requested_mode;
 461
 462         requested_mode = extract_int(cmdbuf,0);
 463         if (requested_mode !=0) requested_mode = 1;
 464
 465         if (!CC->logged_in) {
 466                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 467                 return;
 468                 }
 469
 470         if (CC->usersupp.axlevel < 6) {
 471                 cprintf("%d You must be an Aide to use stealth mode.\n",
 472                         ERROR+HIGHER_ACCESS_REQUIRED);
 473                 return;
 474                 }
 475
 476         if (CC->cs_flags & CS_STEALTH) {
 477                 if (requested_mode == 0)
 478                         CC->cs_flags = CC->cs_flags-CS_STEALTH;
 479                 }
 480         else {
 481                 if (requested_mode == 1)
 482                         CC->cs_flags = CC->cs_flags|CS_STEALTH;
 483                 }
 484
 485         cprintf("%d Ok\n",OK);
 486         }
 487
 488
 489
 490
 491 /*
 492  * display system messages or help
 493  */
 494 void cmd_mesg(char *mname)
 495 {
 496         FILE *mfp;
 497         char targ[256];
 498         char buf[256];
 499         char *dirs[2];
 500
 501         extract(buf,mname,0);
 502
 503
 504         dirs[0]=mallok(64);
 505         dirs[1]=mallok(64);
 506         strcpy(dirs[0],"messages");
 507         strcpy(dirs[1],"help");
 508         mesg_locate(targ,buf,2,dirs);
 509         phree(dirs[0]);
 510         phree(dirs[1]);
 511
 512
 513         if (strlen(targ)==0) {
 514                 cprintf("%d '%s' not found.\n",ERROR,mname);
 515                 return;
 516                 }
 517
 518         mfp = fopen(targ,"r");
 519         if (mfp==NULL) {
 520                 cprintf("%d Cannot open '%s': %s\n",
 521                         ERROR,targ,strerror(errno));
 522                 return;
 523                 }
 524         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 525
 526         while (fgets(buf,255,mfp)!=NULL) {
 527                 buf[strlen(buf)-1] = 0;
 528                 do_help_subst(buf);
 529                 cprintf("%s\n",buf);
 530                 }
 531
 532         fclose(mfp);
 533         cprintf("000\n");
 534         }
 535
 536
 537 /*
 538  * enter system messages or help
 539  */
 540 void cmd_emsg(char *mname)
 541 {
 542         FILE *mfp;
 543         char targ[256];
 544         char buf[256];
 545         char *dirs[2];
 546         int a;
 547
 548         if (CC->usersupp.axlevel < 6) {
 549                 cprintf("%d You must be an Aide to edit system messages.\n",
 550                         ERROR+HIGHER_ACCESS_REQUIRED);
 551                 return;
 552                 }
 553
 554         extract(buf,mname,0);
 555         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 556                 if (buf[a] == '/') buf[a] = '.';
 557                 }
 558
 559         dirs[0]=mallok(64);
 560         dirs[1]=mallok(64);
 561         strcpy(dirs[0],"messages");
 562         strcpy(dirs[1],"help");
 563         mesg_locate(targ,buf,2,dirs);
 564         phree(dirs[0]);
 565         phree(dirs[1]);
 566
 567         if (strlen(targ)==0) {
 568                 snprintf(targ, sizeof targ, "./help/%s", buf);
 569                 }
 570
 571         mfp = fopen(targ,"w");
 572         if (mfp==NULL) {
 573                 cprintf("%d Cannot open '%s': %s\n",
 574                         ERROR,targ,strerror(errno));
 575                 return;
 576                 }
 577         cprintf("%d %s\n", SEND_LISTING, targ);
 578
 579         while (client_gets(buf), strcmp(buf, "000")) {
 580                 fprintf(mfp, "%s\n", buf);
 581                 }
 582
 583         fclose(mfp);
 584         }
 585
 586
 587 /* Don't show the names of private rooms unless the viewing
 588  * user also knows the rooms.
 589  */
 590 void GenerateRoomDisplay(char *real_room,
 591                         struct CitContext *viewed,
 592                         struct CitContext *viewer) {
 593
 594         strcpy(real_room, viewed->quickroom.QRname);
 595         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 596                 strcpy(real_room, &real_room[11]);
 597         }
 598         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 599                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 600                    & UA_KNOWN) == 0) {
 601                         strcpy(real_room, "<private room>");
 602                 }
 603         }
 604
 605         if (viewed->cs_flags & CS_CHAT) {
 606                 while (strlen(real_room) < 14)
 607                         strcat(real_room, " ");
 608
 609                 strcpy(&real_room[14], "<chat>");
 610         }
 611
 612 }
 613
 614
 615 /*
 616  * who's online
 617  */
 618 void cmd_rwho(void) {
 619         struct CitContext *cptr;
 620         int spoofed = 0;
 621         int aide;
 622         char un[40];
 623         char real_room[ROOMNAMELEN], room[ROOMNAMELEN];
 624         char host[40], flags[5];
 625
 626         aide = CC->usersupp.axlevel >= 6;
 627         cprintf("%d%c \n", LISTING_FOLLOWS, check_express() );
 628
 629         for (cptr = ContextList; cptr != NULL; cptr = cptr->next)
 630         {
 631                 flags[0] = '\0';
 632                 spoofed = 0;
 633
 634                 if (cptr->cs_flags & CS_POSTING)
 635                    strcat(flags, "*");
 636                 else
 637                    strcat(flags, ".");
 638
 639                 if (cptr->fake_username[0])
 640                 {
 641                    strcpy(un, cptr->fake_username);
 642                    spoofed = 1;
 643                 }
 644                 else
 645                    strcpy(un, cptr->curr_user);
 646
 647                 if (cptr->fake_hostname[0])
 648                 {
 649                    strcpy(host, cptr->fake_hostname);
 650                    spoofed = 1;
 651                 }
 652                 else
 653                    strcpy(host, cptr->cs_host);
 654
 655                 GenerateRoomDisplay(real_room, cptr, CC);
 656
 657                 if (cptr->fake_roomname[0]) {
 658                         strcpy(room, cptr->fake_roomname);
 659                         spoofed = 1;
 660                 }
 661                 else {
 662                         strcpy(room, real_room);
 663                 }
 664
 665                 if ((aide) && (spoofed))
 666                    strcat(flags, "+");
 667
 668                 if ((cptr->cs_flags & CS_STEALTH) && (aide))
 669                    strcat(flags, "-");
 670
 671                 if (((cptr->cs_flags&CS_STEALTH)==0) || (aide))
 672                 {
 673                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 674                                 cptr->cs_pid, un, room,
 675                                 host, cptr->cs_clientname,
 676                                 (long)(cptr->lastidle),
 677                                 cptr->lastcmdname, flags);
 678                 }
 679                 if ((spoofed) && (aide))
 680                 {
 681                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 682                                 cptr->cs_pid, cptr->curr_user,
 683                                 real_room,
 684                                 cptr->cs_host, cptr->cs_clientname,
 685                                 (long)(cptr->lastidle),
 686                                 cptr->lastcmdname, flags);
 687
 688                 }
 689         }
 690
 691         /* Now it's magic time.  Before we finish, call any EVT_RWHO hooks
 692          * so that external paging modules such as serv_icq can add more
 693          * content to the Wholist.
 694          */
 695         PerformSessionHooks(EVT_RWHO);
 696         cprintf("000\n");
 697         }
 698
 699
 700 /*
 701  * Terminate another running session
 702  */
 703 void cmd_term(char *cmdbuf)
 704 {
 705         int session_num;
 706         struct CitContext *ccptr;
 707         int session_to_kill = 0;
 708
 709         if (!CC->logged_in) {
 710                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 711                 return;
 712                 }
 713
 714         if (CC->usersupp.axlevel < 6) {
 715                 cprintf("%d You must be an Aide to terminate sessions.\n",
 716                         ERROR+HIGHER_ACCESS_REQUIRED);
 717                 return;
 718                 }
 719
 720         session_num = extract_int(cmdbuf, 0);
 721         if (session_num == CC->cs_pid) {
 722                 cprintf("%d You can't kill your own session.\n", ERROR);
 723                 return;
 724                 }
 725
 726         lprintf(9, "Locating session to kill\n");
 727         begin_critical_section(S_SESSION_TABLE);
 728         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 729                 if (session_num == ccptr->cs_pid) {
 730                         session_to_kill = ccptr->cs_pid;
 731                         }
 732                 }
 733         end_critical_section(S_SESSION_TABLE);
 734         lprintf(9, "session_to_kill == %d\n", session_to_kill);
 735
 736         if (session_to_kill > 0) {
 737                 lprintf(9, "calling kill_session()\n");
 738                 kill_session(session_to_kill);
 739                 cprintf("%d Session terminated.\n", OK);
 740                 }
 741         else {
 742                 cprintf("%d No such session.\n", ERROR);
 743                 }
 744         }
 745
 746
 747
 748
 749
 750 /*
 751  * get the paginator prompt
 752  */
 753 void cmd_more(void) {
 754         cprintf("%d %s\n",OK,config.c_moreprompt);
 755         }
 756
 757 /*
 758  * echo
 759  */
 760 void cmd_echo(char *etext)
 761 {
 762         cprintf("%d %s\n",OK,etext);
 763         }
 764
 765
 766
 767 /*
 768  * identify as internal program
 769  */
 770 void cmd_ipgm(char *argbuf)
 771 {
 772         int secret;
 773
 774         secret = extract_int(argbuf, 0);
 775         if (secret == config.c_ipgm_secret) {
 776                 CC->internal_pgm = 1;
 777                 strcpy(CC->curr_user, "<internal program>");
 778                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 779                 cprintf("%d Authenticated as an internal program.\n",OK);
 780                 }
 781         else {
 782                 cprintf("%d Authentication failed.\n",ERROR);
 783                 lprintf(3, "Warning: ipgm authentication failed.\n");
 784                 }
 785         }
 786
 787
 788 /*
 789  * Shut down the server
 790  */
 791 void cmd_down(void) {
 792         if (!CC->logged_in) {
 793                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 794                 return;
 795                 }
 796
 797         if (CC->usersupp.axlevel < 6) {
 798                 cprintf("%d You must be an Aide to shut down the server.\n",
 799                         ERROR+HIGHER_ACCESS_REQUIRED);
 800                 return;
 801                 }
 802
 803         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 804         master_cleanup();
 805         }
 806
 807 /*
 808  * Schedule or cancel a server shutdown
 809  */
 810 void cmd_scdn(char *argbuf)
 811 {
 812         int new_state;
 813
 814         if (!CC->logged_in) {
 815                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 816                 return;
 817                 }
 818
 819         if (CC->usersupp.axlevel < 6) {
 820                 cprintf("%d You must be an Aide to schedule a shutdown.\n",
 821                         ERROR+HIGHER_ACCESS_REQUIRED);
 822                 return;
 823                 }
 824
 825         new_state = extract_int(argbuf, 0);
 826         if ((new_state == 0) || (new_state == 1)) {
 827                 ScheduledShutdown = new_state;
 828                 }
 829         cprintf("%d %d\n", OK, ScheduledShutdown);
 830         }
 831
 832
 833 /*
 834  *
 835  */
 836 void begin_session(struct CitContext *con)
 837 {
 838         int num_sessions, len;
 839         struct sockaddr_in sin;
 840
 841         /*
 842          * Initialize some variables specific to our context.
 843          */
 844         con->logged_in = 0;
 845         con->internal_pgm = 0;
 846         con->download_fp = NULL;
 847         con->upload_fp = NULL;
 848         con->cs_pid = con->client_socket;       /* not necessarily portable */
 849         con->FirstExpressMessage = NULL;
 850         time(&con->lastcmd);
 851         time(&con->lastidle);
 852         strcpy(con->lastcmdname, "    ");
 853         strcpy(con->cs_clientname, "(unknown)");
 854         strcpy(con->curr_user,"(not logged in)");
 855         strcpy(con->net_node,"");
 856         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 857         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 858         con->cs_host[sizeof con->cs_host - 1] = 0;
 859         len = sizeof sin;
 860         if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len))
 861                 locate_host(con->cs_host, &sin.sin_addr);
 862         con->cs_flags = 0;
 863         con->upload_type = UPL_FILE;
 864         con->dl_is_net = 0;
 865         con->FirstSessData = NULL;
 866
 867         num_sessions = session_count();
 868         con->nologin = 0;
 869         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 870                 con->nologin = 1;
 871
 872         if (con->nologin==1) {
 873                 cprintf("%d %s: Too many users are already online "
 874                         "(maximum is %d)\n",
 875                         ERROR+MAX_SESSIONS_EXCEEDED,
 876                         config.c_nodename, config.c_maxsessions);
 877                 }
 878         else {
 879                 cprintf("%d %s Citadel/UX server ready.\n",
 880                         OK, config.c_nodename);
 881                 }
 882
 883         lprintf(3, "citserver[%3d]: started.\n", con->cs_pid);
 884
 885         /* Run any session startup routines registered by loadable modules */
 886         PerformSessionHooks(EVT_START);
 887
 888         rec_log(CL_CONNECT, "");
 889 }
 890
 891
 892
 893
 894 /*
 895  * This loop recognizes all server commands.
 896  */
 897 void do_command_loop(void) {
 898         char cmdbuf[256];
 899
 900         time(&CC->lastcmd);
 901         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 902         if (client_gets(cmdbuf) < 1) {
 903                 lprintf(3, "Client socket is broken.  Ending session.\n");
 904                 CC->state = CON_DYING;
 905                 return;
 906         }
 907         lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 908
 909         /*
 910          * Let other clients see the last command we executed, and
 911          * update the idle time, but not NOOP, PEXP, or GEXP.
 912          */
 913         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 914            && (strncasecmp(cmdbuf, "PEXP", 4))
 915            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 916                 strcpy(CC->lastcmdname, "    ");
 917                 safestrncpy(CC->lastcmdname, cmdbuf,
 918                         sizeof(CC->lastcmdname) );
 919                 time(&CC->lastidle);
 920                 }
 921
 922         if ((strncasecmp(cmdbuf, "ENT0", 4))
 923            && (strncasecmp(cmdbuf, "MESG", 4))
 924            && (strncasecmp(cmdbuf, "MSGS", 4)))
 925         {
 926            CC->cs_flags &= ~CS_POSTING;
 927         }
 928
 929         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 930                 cprintf("%d%cok\n",OK,check_express());
 931                 }
 932
 933         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 934                 cprintf("%d Goodbye.\n",OK);
 935                 CC->state = CON_DYING;
 936                 }
 937
 938         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 939                 if (CC->logged_in) logout(CC);
 940                 cprintf("%d logged out.\n",OK);
 941                 }
 942
 943         else if (!strncasecmp(cmdbuf,"USER",4)) {
 944                 cmd_user(&cmdbuf[5]);
 945                 }
 946
 947         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 948                 cmd_pass(&cmdbuf[5]);
 949                 }
 950
 951         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 952                 cmd_newu(&cmdbuf[5]);
 953                 }
 954
 955         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 956                 cmd_setp(&cmdbuf[5]);
 957                 }
 958
 959         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 960                 cmd_lrms(&cmdbuf[5]);
 961                 }
 962
 963         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 964                 cmd_lkra(&cmdbuf[5]);
 965                 }
 966
 967         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 968                 cmd_lkrn(&cmdbuf[5]);
 969                 }
 970
 971         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 972                 cmd_lkro(&cmdbuf[5]);
 973                 }
 974
 975         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 976                 cmd_lzrm(&cmdbuf[5]);
 977                 }
 978
 979         else if (!strncasecmp(cmdbuf,"GETU",4)) {
 980                 cmd_getu();
 981                 }
 982
 983         else if (!strncasecmp(cmdbuf,"SETU",4)) {
 984                 cmd_setu(&cmdbuf[5]);
 985                 }
 986
 987         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 988                 cmd_goto(&cmdbuf[5]);
 989                 }
 990
 991         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 992                 cmd_msgs(&cmdbuf[5]);
 993                 }
 994
 995         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
 996                 cmd_whok();
 997                 }
 998
 999         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1000                 cmd_rdir();
1001                 }
1002
1003         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1004                 cmd_msg0(&cmdbuf[5]);
1005                 }
1006
1007         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1008                 cmd_msg2(&cmdbuf[5]);
1009                 }
1010
1011         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1012                 cmd_msg3(&cmdbuf[5]);
1013                 }
1014
1015         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1016                 cmd_msg4(&cmdbuf[5]);
1017                 }
1018
1019         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1020                 cmd_opna(&cmdbuf[5]);
1021                 }
1022
1023         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1024                 cmd_info();
1025                 }
1026
1027         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1028                 cmd_slrp(&cmdbuf[5]);
1029                 }
1030
1031         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1032                 cmd_invt_kick(&cmdbuf[5],1);
1033                 }
1034
1035         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1036                 cmd_invt_kick(&cmdbuf[5],0);
1037                 }
1038
1039         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1040                 cmd_getr();
1041                 }
1042
1043         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1044                 cmd_setr(&cmdbuf[5]);
1045                 }
1046
1047         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1048                 cmd_geta();
1049                 }
1050
1051         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1052                 cmd_seta(&cmdbuf[5]);
1053                 }
1054
1055         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1056                 cmd_ent0(&cmdbuf[5]);
1057                 }
1058
1059         else if (!strncasecmp(cmdbuf,"ENT3",4)) {
1060                 cmd_ent3(&cmdbuf[5]);
1061                 }
1062
1063         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1064                 cmd_rinf();
1065                 }
1066
1067         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1068                 cmd_dele(&cmdbuf[5]);
1069                 }
1070
1071         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1072                 cmd_kill(&cmdbuf[5]);
1073                 }
1074
1075         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1076                 cmd_cre8(&cmdbuf[5]);
1077                 }
1078
1079         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1080                 cmd_move(&cmdbuf[5]);
1081                 }
1082
1083         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1084                 cmd_forg();
1085                 }
1086
1087         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1088                 cmd_mesg(&cmdbuf[5]);
1089                 }
1090
1091         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1092                 cmd_emsg(&cmdbuf[5]);
1093                 }
1094
1095         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1096                 cmd_gnur();
1097                 }
1098
1099         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1100                 cmd_vali(&cmdbuf[5]);
1101                 }
1102
1103         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1104                 cmd_einf(&cmdbuf[5]);
1105                 }
1106
1107         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1108                 cmd_list();
1109                 }
1110
1111         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1112                 cmd_chek();
1113                 }
1114
1115         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1116                 cmd_delf(&cmdbuf[5]);
1117                 }
1118
1119         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1120                 cmd_movf(&cmdbuf[5]);
1121                 }
1122
1123         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1124                 cmd_netf(&cmdbuf[5]);
1125                 }
1126
1127         else if (!strncasecmp(cmdbuf,"RWHO",4)) {
1128                 cmd_rwho();
1129                 }
1130
1131         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1132                 cmd_open(&cmdbuf[5]);
1133                 }
1134
1135         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1136                 cmd_clos();
1137                 }
1138
1139         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1140                 cmd_uopn(&cmdbuf[5]);
1141                 }
1142
1143         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1144                 cmd_ucls(&cmdbuf[5]);
1145                 }
1146
1147         else if (!strncasecmp(cmdbuf,"READ",4)) {
1148                 cmd_read(&cmdbuf[5]);
1149                 }
1150
1151         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1152                 cmd_writ(&cmdbuf[5]);
1153                 }
1154
1155         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1156                 cmd_qusr(&cmdbuf[5]);
1157                 }
1158
1159         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1160                 cmd_echo(&cmdbuf[5]);
1161                 }
1162
1163         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1164                 cmd_oimg(&cmdbuf[5]);
1165                 }
1166
1167         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1168                 cmd_more();
1169                 }
1170
1171         else if (!strncasecmp(cmdbuf,"NETP",4)) {
1172                 cmd_netp(&cmdbuf[5]);
1173                 }
1174
1175         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1176                 cmd_ndop(&cmdbuf[5]);
1177                 }
1178
1179         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1180                 cmd_nuop(&cmdbuf[5]);
1181                 }
1182
1183         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1184                 cmd_lflr();
1185                 }
1186
1187         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1188                 cmd_cflr(&cmdbuf[5]);
1189                 }
1190
1191         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1192                 cmd_kflr(&cmdbuf[5]);
1193                 }
1194
1195         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1196                 cmd_eflr(&cmdbuf[5]);
1197                 }
1198
1199         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1200                 cmd_iden(&cmdbuf[5]);
1201                 }
1202
1203         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1204                 cmd_ipgm(&cmdbuf[5]);
1205                 }
1206
1207         else if (!strncasecmp(cmdbuf,"EBIO",4)) {
1208                 cmd_ebio();
1209                 }
1210
1211         else if (!strncasecmp(cmdbuf,"RBIO",4)) {
1212                 cmd_rbio(&cmdbuf[5]);
1213                 }
1214
1215         else if (!strncasecmp(cmdbuf,"LBIO",4)) {
1216                 cmd_lbio();
1217                 }
1218
1219         else if (!strncasecmp(cmdbuf,"STEL",4)) {
1220                 cmd_stel(&cmdbuf[5]);
1221                 }
1222
1223         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1224                 cmd_term(&cmdbuf[5]);
1225                 }
1226
1227         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1228                 cmd_down();
1229                 }
1230
1231         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1232                 cmd_scdn(&cmdbuf[5]);
1233                 }
1234
1235         else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1236                 cmd_nset(&cmdbuf[5]);
1237                 }
1238
1239         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1240                 cmd_uimg(&cmdbuf[5]);
1241                 }
1242
1243         else if (!strncasecmp(cmdbuf, "UCHG", 4)) {
1244                 cmd_uchg(&cmdbuf[5]);
1245                 }
1246
1247         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1248                 cmd_time();
1249                 }
1250
1251         else if (!strncasecmp(cmdbuf, "HCHG", 4)) {
1252                 cmd_hchg(&cmdbuf[5]);
1253                 }
1254
1255         else if (!strncasecmp(cmdbuf, "RCHG", 4)) {
1256                 cmd_rchg(&cmdbuf[5]);
1257                 }
1258
1259         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1260                 cmd_agup(&cmdbuf[5]);
1261                 }
1262
1263         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1264                 cmd_asup(&cmdbuf[5]);
1265                 }
1266
1267         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1268                 cmd_gpex(&cmdbuf[5]);
1269                 }
1270
1271         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1272                 cmd_spex(&cmdbuf[5]);
1273                 }
1274
1275         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1276                 cmd_conf(&cmdbuf[5]);
1277                 }
1278
1279 #ifdef DEBUG_MEMORY_LEAKS
1280         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1281                 dump_tracked();
1282                 }
1283 #endif
1284
1285         else if (!DLoader_Exec_Cmd(cmdbuf))
1286                 {
1287                    cprintf("%d Unrecognized or unsupported command.\n",
1288                             ERROR);
1289                 }
1290
1291         /* Run any after-each-command outines registered by modules */
1292         PerformSessionHooks(EVT_CMD);
1293 }