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[ROOMNAMELEN];
 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[25];
 295
 296         extract(newhostname, argbuf, 0);
 297         newhostname[24] = 0;
 298         if (strlen(newhostname) > 0) {
 299                 safestrncpy(CC->fake_hostname, newhostname,
 300                         sizeof(CC->fake_hostname) );
 301                 }
 302         else {
 303                 strcpy(CC->fake_hostname, "");
 304                 }
 305         cprintf("%d OK\n", OK);
 306 }
 307
 308 void cmd_uchg(char *newusername)
 309 {
 310    if (CC->usersupp.axlevel < 6)
 311    {
 312       cprintf("%d You must be an Aide to use UCHG.\n",
 313                 ERROR+HIGHER_ACCESS_REQUIRED);
 314       return;
 315    }
 316    if ((newusername) && (newusername[0]))
 317    {
 318       CC->cs_flags &= ~CS_STEALTH;
 319       memset(CC->fake_username, 0, 32);
 320       if (strncasecmp(newusername, CC->curr_user, strlen(CC->curr_user)))
 321          safestrncpy(CC->fake_username, newusername, sizeof(CC->fake_username));
 322    }
 323    else
 324    {
 325       CC->fake_username[0] = '\0';
 326       CC->cs_flags |= CS_STEALTH;
 327    }
 328    cprintf("%d\n",OK);
 329 }
 330
 331 /*
 332  * returns an asterisk if there are any express messages waiting,
 333  * space otherwise.
 334  */
 335 char check_express(void) {
 336         if (CC->FirstExpressMessage == NULL) {
 337                 return(' ');
 338                 }
 339         else {
 340                 return('*');
 341                 }
 342         }
 343
 344 void cmd_time(void)
 345 {
 346    time_t tv;
 347
 348    tv = time(NULL);
 349
 350    cprintf("%d %ld\n", OK, tv);
 351 }
 352
 353 /*
 354  * Check whether two hostnames match.
 355  * "Realname" should be an actual name of a client that is trying to connect;
 356  * "testname" should be the value we are comparing it with. The idea is that we
 357  * want to compare with both the abbreviated and fully-qualified versions of
 358  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 359  */
 360 static int hostnames_match(const char *realname, const char *testname) {
 361         struct hostent *he;
 362         int retval = 0;
 363
 364         if (!strcasecmp(realname, testname))
 365                 return 1;
 366
 367 #ifdef HAVE_NONREENTRANT_NETDB
 368         begin_critical_section(S_NETDB);
 369 #endif
 370
 371         if ((he = gethostbyname(testname)) != NULL)
 372                 if (!strcasecmp(realname, he->h_name))
 373                         retval = 1;
 374
 375 #ifdef HAVE_NONREENTRANT_NETDB
 376         end_critical_section(S_NETDB);
 377 #endif
 378
 379         return retval;
 380         }
 381
 382 /*
 383  * check a hostname against the public_clients file
 384  */
 385 int is_public_client(char *where)
 386 {
 387         char buf[256];
 388         FILE *fp;
 389
 390         if (hostnames_match(where,"localhost")) return(1);
 391         if (hostnames_match(where,config.c_fqdn)) return(1);
 392
 393         fp = fopen("public_clients","r");
 394         if (fp == NULL) return(0);
 395
 396         while (fgets(buf,256,fp)!=NULL) {
 397                 while (isspace((buf[strlen(buf)-1])))
 398                         buf[strlen(buf)-1] = 0;
 399                 if (hostnames_match(where,buf)) {
 400                         fclose(fp);
 401                         return(1);
 402                         }
 403                 }
 404
 405         fclose(fp);
 406         return(0);
 407         }
 408
 409
 410 /*
 411  * the client is identifying itself to the server
 412  */
 413 void cmd_iden(char *argbuf)
 414 {
 415         int dev_code;
 416         int cli_code;
 417         int rev_level;
 418         char desc[256];
 419         char from_host[256];
 420         struct in_addr addr;
 421
 422         if (num_parms(argbuf)<4) {
 423                 cprintf("%d usage error\n",ERROR);
 424                 return;
 425                 }
 426
 427         dev_code = extract_int(argbuf,0);
 428         cli_code = extract_int(argbuf,1);
 429         rev_level = extract_int(argbuf,2);
 430         extract(desc,argbuf,3);
 431
 432         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 433         from_host[sizeof from_host - 1] = 0;
 434         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 435
 436         CC->cs_clientdev = dev_code;
 437         CC->cs_clienttyp = cli_code;
 438         CC->cs_clientver = rev_level;
 439         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 440         CC->cs_clientname[31] = 0;
 441
 442         lprintf(9, "Looking up hostname '%s'\n", from_host);
 443         if ((strlen(from_host)>0) &&
 444            (is_public_client(CC->cs_host))) {
 445                 if (inet_aton(from_host, &addr))
 446                         locate_host(CC->cs_host, &addr);
 447                 else {
 448                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 449                         CC->cs_host[24] = 0;
 450                         }
 451                 }
 452
 453         syslog(LOG_NOTICE,"client %d/%d/%01d.%02d (%s)\n",
 454                 dev_code,
 455                 cli_code,
 456                 (rev_level / 100),
 457                 (rev_level % 100),
 458                 desc);
 459                 cprintf("%d Ok\n",OK);
 460         }
 461
 462
 463 /*
 464  * enter or exit "stealth mode"
 465  */
 466 void cmd_stel(char *cmdbuf)
 467 {
 468         int requested_mode;
 469
 470         requested_mode = extract_int(cmdbuf,0);
 471         if (requested_mode !=0) requested_mode = 1;
 472
 473         if (!CC->logged_in) {
 474                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 475                 return;
 476                 }
 477
 478         if (CC->usersupp.axlevel < 6) {
 479                 cprintf("%d You must be an Aide to use stealth mode.\n",
 480                         ERROR+HIGHER_ACCESS_REQUIRED);
 481                 return;
 482                 }
 483
 484         if (CC->cs_flags & CS_STEALTH) {
 485                 if (requested_mode == 0)
 486                         CC->cs_flags = CC->cs_flags-CS_STEALTH;
 487                 }
 488         else {
 489                 if (requested_mode == 1)
 490                         CC->cs_flags = CC->cs_flags|CS_STEALTH;
 491                 }
 492
 493         cprintf("%d Ok\n",OK);
 494         }
 495
 496
 497
 498
 499 /*
 500  * display system messages or help
 501  */
 502 void cmd_mesg(char *mname)
 503 {
 504         FILE *mfp;
 505         char targ[256];
 506         char buf[256];
 507         char *dirs[2];
 508
 509         extract(buf,mname,0);
 510
 511
 512         dirs[0]=mallok(64);
 513         dirs[1]=mallok(64);
 514         strcpy(dirs[0],"messages");
 515         strcpy(dirs[1],"help");
 516         mesg_locate(targ,buf,2,dirs);
 517         phree(dirs[0]);
 518         phree(dirs[1]);
 519
 520
 521         if (strlen(targ)==0) {
 522                 cprintf("%d '%s' not found.\n",ERROR,mname);
 523                 return;
 524                 }
 525
 526         mfp = fopen(targ,"r");
 527         if (mfp==NULL) {
 528                 cprintf("%d Cannot open '%s': %s\n",
 529                         ERROR,targ,strerror(errno));
 530                 return;
 531                 }
 532         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 533
 534         while (fgets(buf,255,mfp)!=NULL) {
 535                 buf[strlen(buf)-1] = 0;
 536                 do_help_subst(buf);
 537                 cprintf("%s\n",buf);
 538                 }
 539
 540         fclose(mfp);
 541         cprintf("000\n");
 542         }
 543
 544
 545 /*
 546  * enter system messages or help
 547  */
 548 void cmd_emsg(char *mname)
 549 {
 550         FILE *mfp;
 551         char targ[256];
 552         char buf[256];
 553         char *dirs[2];
 554         int a;
 555
 556         if (CC->usersupp.axlevel < 6) {
 557                 cprintf("%d You must be an Aide to edit system messages.\n",
 558                         ERROR+HIGHER_ACCESS_REQUIRED);
 559                 return;
 560                 }
 561
 562         extract(buf,mname,0);
 563         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 564                 if (buf[a] == '/') buf[a] = '.';
 565                 }
 566
 567         dirs[0]=mallok(64);
 568         dirs[1]=mallok(64);
 569         strcpy(dirs[0],"messages");
 570         strcpy(dirs[1],"help");
 571         mesg_locate(targ,buf,2,dirs);
 572         phree(dirs[0]);
 573         phree(dirs[1]);
 574
 575         if (strlen(targ)==0) {
 576                 snprintf(targ, sizeof targ, "./help/%s", buf);
 577                 }
 578
 579         mfp = fopen(targ,"w");
 580         if (mfp==NULL) {
 581                 cprintf("%d Cannot open '%s': %s\n",
 582                         ERROR,targ,strerror(errno));
 583                 return;
 584                 }
 585         cprintf("%d %s\n", SEND_LISTING, targ);
 586
 587         while (client_gets(buf), strcmp(buf, "000")) {
 588                 fprintf(mfp, "%s\n", buf);
 589                 }
 590
 591         fclose(mfp);
 592         }
 593
 594
 595 /* Don't show the names of private rooms unless the viewing
 596  * user also knows the rooms.
 597  */
 598 void GenerateRoomDisplay(char *real_room,
 599                         struct CitContext *viewed,
 600                         struct CitContext *viewer) {
 601
 602         strcpy(real_room, viewed->quickroom.QRname);
 603         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 604                 strcpy(real_room, &real_room[11]);
 605         }
 606         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 607                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 608                    & UA_KNOWN) == 0) {
 609                         strcpy(real_room, "<private room>");
 610                 }
 611         }
 612
 613         if (viewed->cs_flags & CS_CHAT) {
 614                 while (strlen(real_room) < 14)
 615                         strcat(real_room, " ");
 616
 617                 strcpy(&real_room[14], "<chat>");
 618         }
 619
 620 }
 621
 622
 623 /*
 624  * who's online
 625  */
 626 void cmd_rwho(void) {
 627         struct CitContext *cptr;
 628         int spoofed = 0;
 629         int aide;
 630         char un[40];
 631         char real_room[ROOMNAMELEN], room[ROOMNAMELEN];
 632         char host[40], flags[5];
 633
 634         aide = CC->usersupp.axlevel >= 6;
 635         cprintf("%d%c \n", LISTING_FOLLOWS, check_express() );
 636
 637         for (cptr = ContextList; cptr != NULL; cptr = cptr->next)
 638         {
 639                 flags[0] = '\0';
 640                 spoofed = 0;
 641
 642                 if (cptr->cs_flags & CS_POSTING)
 643                    strcat(flags, "*");
 644                 else
 645                    strcat(flags, ".");
 646
 647                 if (cptr->fake_username[0])
 648                 {
 649                    strcpy(un, cptr->fake_username);
 650                    spoofed = 1;
 651                 }
 652                 else
 653                    strcpy(un, cptr->curr_user);
 654
 655                 if (cptr->fake_hostname[0])
 656                 {
 657                    strcpy(host, cptr->fake_hostname);
 658                    spoofed = 1;
 659                 }
 660                 else
 661                    strcpy(host, cptr->cs_host);
 662
 663                 GenerateRoomDisplay(real_room, cptr, CC);
 664
 665                 if (cptr->fake_roomname[0]) {
 666                         strcpy(room, cptr->fake_roomname);
 667                         spoofed = 1;
 668                 }
 669                 else {
 670                         strcpy(room, real_room);
 671                 }
 672
 673                 if ((aide) && (spoofed))
 674                    strcat(flags, "+");
 675
 676                 if ((cptr->cs_flags & CS_STEALTH) && (aide))
 677                    strcat(flags, "-");
 678
 679                 if (((cptr->cs_flags&CS_STEALTH)==0) || (aide))
 680                 {
 681                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 682                                 cptr->cs_pid, un, room,
 683                                 host, cptr->cs_clientname,
 684                                 (long)(cptr->lastidle),
 685                                 cptr->lastcmdname, flags);
 686                 }
 687                 if ((spoofed) && (aide))
 688                 {
 689                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 690                                 cptr->cs_pid, cptr->curr_user,
 691                                 real_room,
 692                                 cptr->cs_host, cptr->cs_clientname,
 693                                 (long)(cptr->lastidle),
 694                                 cptr->lastcmdname, flags);
 695
 696                 }
 697         }
 698
 699         /* Now it's magic time.  Before we finish, call any EVT_RWHO hooks
 700          * so that external paging modules such as serv_icq can add more
 701          * content to the Wholist.
 702          */
 703         PerformSessionHooks(EVT_RWHO);
 704         cprintf("000\n");
 705         }
 706
 707
 708 /*
 709  * Terminate another running session
 710  */
 711 void cmd_term(char *cmdbuf)
 712 {
 713         int session_num;
 714         struct CitContext *ccptr;
 715         int found_it = 0;
 716
 717         if (!CC->logged_in) {
 718                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 719                 return;
 720                 }
 721
 722         if (CC->usersupp.axlevel < 6) {
 723                 cprintf("%d You must be an Aide to terminate sessions.\n",
 724                         ERROR+HIGHER_ACCESS_REQUIRED);
 725                 return;
 726                 }
 727
 728         session_num = extract_int(cmdbuf, 0);
 729         if (session_num == CC->cs_pid) {
 730                 cprintf("%d You can't kill your own session.\n", ERROR);
 731                 return;
 732                 }
 733
 734         lprintf(9, "Locating session to kill\n");
 735         begin_critical_section(S_SESSION_TABLE);
 736         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 737                 if (session_num == ccptr->cs_pid) {
 738                         ccptr->kill_me = 1;
 739                         found_it = 1;
 740                         }
 741                 }
 742         end_critical_section(S_SESSION_TABLE);
 743
 744         if (found_it) {
 745                 cprintf("%d Session terminated.\n", OK);
 746                 }
 747         else {
 748                 cprintf("%d No such session.\n", ERROR);
 749                 }
 750         }
 751
 752
 753
 754
 755
 756 /*
 757  * get the paginator prompt
 758  */
 759 void cmd_more(void) {
 760         cprintf("%d %s\n",OK,config.c_moreprompt);
 761         }
 762
 763 /*
 764  * echo
 765  */
 766 void cmd_echo(char *etext)
 767 {
 768         cprintf("%d %s\n",OK,etext);
 769         }
 770
 771
 772
 773 /*
 774  * identify as internal program
 775  */
 776 void cmd_ipgm(char *argbuf)
 777 {
 778         int secret;
 779
 780         secret = extract_int(argbuf, 0);
 781         if (secret == config.c_ipgm_secret) {
 782                 CC->internal_pgm = 1;
 783                 strcpy(CC->curr_user, "<internal program>");
 784                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 785                 cprintf("%d Authenticated as an internal program.\n",OK);
 786                 }
 787         else {
 788                 cprintf("%d Authentication failed.\n",ERROR);
 789                 lprintf(3, "Warning: ipgm authentication failed.\n");
 790                 }
 791         }
 792
 793
 794 /*
 795  * Shut down the server
 796  */
 797 void cmd_down(void) {
 798         if (!CC->logged_in) {
 799                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 800                 return;
 801                 }
 802
 803         if (CC->usersupp.axlevel < 6) {
 804                 cprintf("%d You must be an Aide to shut down the server.\n",
 805                         ERROR+HIGHER_ACCESS_REQUIRED);
 806                 return;
 807                 }
 808
 809         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 810         master_cleanup();
 811         }
 812
 813 /*
 814  * Schedule or cancel a server shutdown
 815  */
 816 void cmd_scdn(char *argbuf)
 817 {
 818         int new_state;
 819
 820         if (!CC->logged_in) {
 821                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 822                 return;
 823                 }
 824
 825         if (CC->usersupp.axlevel < 6) {
 826                 cprintf("%d You must be an Aide to schedule a shutdown.\n",
 827                         ERROR+HIGHER_ACCESS_REQUIRED);
 828                 return;
 829                 }
 830
 831         new_state = extract_int(argbuf, 0);
 832         if ((new_state == 0) || (new_state == 1)) {
 833                 ScheduledShutdown = new_state;
 834                 }
 835         cprintf("%d %d\n", OK, ScheduledShutdown);
 836         }
 837
 838
 839 /*
 840  *
 841  */
 842 void begin_session(struct CitContext *con)
 843 {
 844         int num_sessions, len;
 845         struct sockaddr_in sin;
 846
 847         /*
 848          * Initialize some variables specific to our context.
 849          */
 850         con->logged_in = 0;
 851         con->internal_pgm = 0;
 852         con->download_fp = NULL;
 853         con->upload_fp = NULL;
 854         con->FirstExpressMessage = NULL;
 855         time(&con->lastcmd);
 856         time(&con->lastidle);
 857         strcpy(con->lastcmdname, "    ");
 858         strcpy(con->cs_clientname, "(unknown)");
 859         strcpy(con->curr_user,"(not logged in)");
 860         strcpy(con->net_node,"");
 861         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 862         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 863         con->cs_host[sizeof con->cs_host - 1] = 0;
 864         len = sizeof sin;
 865         if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len))
 866                 locate_host(con->cs_host, &sin.sin_addr);
 867         con->cs_flags = 0;
 868         con->upload_type = UPL_FILE;
 869         con->dl_is_net = 0;
 870         con->FirstSessData = NULL;
 871
 872         num_sessions = session_count();
 873         con->nologin = 0;
 874         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 875                 con->nologin = 1;
 876
 877         if (con->nologin==1) {
 878                 cprintf("%d %s: Too many users are already online "
 879                         "(maximum is %d)\n",
 880                         ERROR+MAX_SESSIONS_EXCEEDED,
 881                         config.c_nodename, config.c_maxsessions);
 882                 }
 883         else {
 884                 cprintf("%d %s Citadel/UX server ready.\n",
 885                         OK, config.c_nodename);
 886                 }
 887
 888         lprintf(3, "citserver[%3d]: started.\n", con->cs_pid);
 889
 890         /* Run any session startup routines registered by loadable modules */
 891         PerformSessionHooks(EVT_START);
 892
 893         rec_log(CL_CONNECT, "");
 894 }
 895
 896
 897
 898
 899 /*
 900  * This loop recognizes all server commands.
 901  */
 902 void do_command_loop(void) {
 903         char cmdbuf[256];
 904
 905         time(&CC->lastcmd);
 906         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 907         if (client_gets(cmdbuf) < 1) {
 908                 lprintf(3, "Client socket is broken.  Ending session.\n");
 909                 CC->kill_me = 1;
 910                 return;
 911         }
 912         lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 913
 914         /*
 915          * Let other clients see the last command we executed, and
 916          * update the idle time, but not NOOP, PEXP, or GEXP.
 917          */
 918         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 919            && (strncasecmp(cmdbuf, "PEXP", 4))
 920            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 921                 strcpy(CC->lastcmdname, "    ");
 922                 safestrncpy(CC->lastcmdname, cmdbuf,
 923                         sizeof(CC->lastcmdname) );
 924                 time(&CC->lastidle);
 925                 }
 926
 927         if ((strncasecmp(cmdbuf, "ENT0", 4))
 928            && (strncasecmp(cmdbuf, "MESG", 4))
 929            && (strncasecmp(cmdbuf, "MSGS", 4)))
 930         {
 931            CC->cs_flags &= ~CS_POSTING;
 932         }
 933
 934         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 935                 cprintf("%d%cok\n",OK,check_express());
 936                 }
 937
 938         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 939                 cprintf("%d Goodbye.\n",OK);
 940                 CC->kill_me = 1;
 941                 }
 942
 943         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 944                 if (CC->logged_in) logout(CC);
 945                 cprintf("%d logged out.\n",OK);
 946                 }
 947
 948         else if (!strncasecmp(cmdbuf,"USER",4)) {
 949                 cmd_user(&cmdbuf[5]);
 950                 }
 951
 952         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 953                 cmd_pass(&cmdbuf[5]);
 954                 }
 955
 956         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 957                 cmd_newu(&cmdbuf[5]);
 958                 }
 959
 960         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 961                 cmd_setp(&cmdbuf[5]);
 962                 }
 963
 964         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 965                 cmd_lrms(&cmdbuf[5]);
 966                 }
 967
 968         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 969                 cmd_lkra(&cmdbuf[5]);
 970                 }
 971
 972         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 973                 cmd_lkrn(&cmdbuf[5]);
 974                 }
 975
 976         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 977                 cmd_lkro(&cmdbuf[5]);
 978                 }
 979
 980         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
 981                 cmd_lzrm(&cmdbuf[5]);
 982                 }
 983
 984         else if (!strncasecmp(cmdbuf,"GETU",4)) {
 985                 cmd_getu();
 986                 }
 987
 988         else if (!strncasecmp(cmdbuf,"SETU",4)) {
 989                 cmd_setu(&cmdbuf[5]);
 990                 }
 991
 992         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
 993                 cmd_goto(&cmdbuf[5]);
 994                 }
 995
 996         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
 997                 cmd_msgs(&cmdbuf[5]);
 998                 }
 999
1000         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1001                 cmd_whok();
1002                 }
1003
1004         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1005                 cmd_rdir();
1006                 }
1007
1008         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1009                 cmd_msg0(&cmdbuf[5]);
1010                 }
1011
1012         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1013                 cmd_msg2(&cmdbuf[5]);
1014                 }
1015
1016         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1017                 cmd_msg3(&cmdbuf[5]);
1018                 }
1019
1020         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1021                 cmd_msg4(&cmdbuf[5]);
1022                 }
1023
1024         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1025                 cmd_opna(&cmdbuf[5]);
1026                 }
1027
1028         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1029                 cmd_info();
1030                 }
1031
1032         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1033                 cmd_slrp(&cmdbuf[5]);
1034                 }
1035
1036         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1037                 cmd_invt_kick(&cmdbuf[5],1);
1038                 }
1039
1040         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1041                 cmd_invt_kick(&cmdbuf[5],0);
1042                 }
1043
1044         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1045                 cmd_getr();
1046                 }
1047
1048         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1049                 cmd_setr(&cmdbuf[5]);
1050                 }
1051
1052         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1053                 cmd_geta();
1054                 }
1055
1056         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1057                 cmd_seta(&cmdbuf[5]);
1058                 }
1059
1060         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1061                 cmd_ent0(&cmdbuf[5]);
1062                 }
1063
1064         else if (!strncasecmp(cmdbuf,"ENT3",4)) {
1065                 cmd_ent3(&cmdbuf[5]);
1066                 }
1067
1068         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1069                 cmd_rinf();
1070                 }
1071
1072         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1073                 cmd_dele(&cmdbuf[5]);
1074                 }
1075
1076         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1077                 cmd_kill(&cmdbuf[5]);
1078                 }
1079
1080         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1081                 cmd_cre8(&cmdbuf[5]);
1082                 }
1083
1084         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1085                 cmd_move(&cmdbuf[5]);
1086                 }
1087
1088         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1089                 cmd_forg();
1090                 }
1091
1092         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1093                 cmd_mesg(&cmdbuf[5]);
1094                 }
1095
1096         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1097                 cmd_emsg(&cmdbuf[5]);
1098                 }
1099
1100         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1101                 cmd_gnur();
1102                 }
1103
1104         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1105                 cmd_vali(&cmdbuf[5]);
1106                 }
1107
1108         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1109                 cmd_einf(&cmdbuf[5]);
1110                 }
1111
1112         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1113                 cmd_list();
1114                 }
1115
1116         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1117                 cmd_chek();
1118                 }
1119
1120         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1121                 cmd_delf(&cmdbuf[5]);
1122                 }
1123
1124         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1125                 cmd_movf(&cmdbuf[5]);
1126                 }
1127
1128         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1129                 cmd_netf(&cmdbuf[5]);
1130                 }
1131
1132         else if (!strncasecmp(cmdbuf,"RWHO",4)) {
1133                 cmd_rwho();
1134                 }
1135
1136         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1137                 cmd_open(&cmdbuf[5]);
1138                 }
1139
1140         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1141                 cmd_clos();
1142                 }
1143
1144         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1145                 cmd_uopn(&cmdbuf[5]);
1146                 }
1147
1148         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1149                 cmd_ucls(&cmdbuf[5]);
1150                 }
1151
1152         else if (!strncasecmp(cmdbuf,"READ",4)) {
1153                 cmd_read(&cmdbuf[5]);
1154                 }
1155
1156         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1157                 cmd_writ(&cmdbuf[5]);
1158                 }
1159
1160         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1161                 cmd_qusr(&cmdbuf[5]);
1162                 }
1163
1164         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1165                 cmd_echo(&cmdbuf[5]);
1166                 }
1167
1168         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1169                 cmd_oimg(&cmdbuf[5]);
1170                 }
1171
1172         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1173                 cmd_more();
1174                 }
1175
1176         else if (!strncasecmp(cmdbuf,"NETP",4)) {
1177                 cmd_netp(&cmdbuf[5]);
1178                 }
1179
1180         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1181                 cmd_ndop(&cmdbuf[5]);
1182                 }
1183
1184         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1185                 cmd_nuop(&cmdbuf[5]);
1186                 }
1187
1188         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1189                 cmd_lflr();
1190                 }
1191
1192         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1193                 cmd_cflr(&cmdbuf[5]);
1194                 }
1195
1196         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1197                 cmd_kflr(&cmdbuf[5]);
1198                 }
1199
1200         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1201                 cmd_eflr(&cmdbuf[5]);
1202                 }
1203
1204         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1205                 cmd_iden(&cmdbuf[5]);
1206                 }
1207
1208         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1209                 cmd_ipgm(&cmdbuf[5]);
1210                 }
1211
1212         else if (!strncasecmp(cmdbuf,"EBIO",4)) {
1213                 cmd_ebio();
1214                 }
1215
1216         else if (!strncasecmp(cmdbuf,"RBIO",4)) {
1217                 cmd_rbio(&cmdbuf[5]);
1218                 }
1219
1220         else if (!strncasecmp(cmdbuf,"LBIO",4)) {
1221                 cmd_lbio();
1222                 }
1223
1224         else if (!strncasecmp(cmdbuf,"STEL",4)) {
1225                 cmd_stel(&cmdbuf[5]);
1226                 }
1227
1228         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1229                 cmd_term(&cmdbuf[5]);
1230                 }
1231
1232         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1233                 cmd_down();
1234                 }
1235
1236         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1237                 cmd_scdn(&cmdbuf[5]);
1238                 }
1239
1240         else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1241                 cmd_nset(&cmdbuf[5]);
1242                 }
1243
1244         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1245                 cmd_uimg(&cmdbuf[5]);
1246                 }
1247
1248         else if (!strncasecmp(cmdbuf, "UCHG", 4)) {
1249                 cmd_uchg(&cmdbuf[5]);
1250                 }
1251
1252         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1253                 cmd_time();
1254                 }
1255
1256         else if (!strncasecmp(cmdbuf, "HCHG", 4)) {
1257                 cmd_hchg(&cmdbuf[5]);
1258                 }
1259
1260         else if (!strncasecmp(cmdbuf, "RCHG", 4)) {
1261                 cmd_rchg(&cmdbuf[5]);
1262                 }
1263
1264         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1265                 cmd_agup(&cmdbuf[5]);
1266                 }
1267
1268         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1269                 cmd_asup(&cmdbuf[5]);
1270                 }
1271
1272         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1273                 cmd_gpex(&cmdbuf[5]);
1274                 }
1275
1276         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1277                 cmd_spex(&cmdbuf[5]);
1278                 }
1279
1280         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1281                 cmd_conf(&cmdbuf[5]);
1282                 }
1283
1284 #ifdef DEBUG_MEMORY_LEAKS
1285         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1286                 dump_tracked();
1287                 }
1288 #endif
1289
1290         else if (!DLoader_Exec_Cmd(cmdbuf))
1291                 {
1292                    cprintf("%d Unrecognized or unsupported command.\n",
1293                             ERROR);
1294                 }
1295
1296         /* Run any after-each-command outines registered by modules */
1297         PerformSessionHooks(EVT_CMD);
1298 }