citadel/citserver.c

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