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