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