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/types.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include "citadel.h"
  21 #include "server.h"
  22 #include "sysdep_decls.h"
  23 #include "citserver.h"
  24 #include "config.h"
  25 #include "database.h"
  26 #include "housekeeping.h"
  27 #include "user_ops.h"
  28 #include "logging.h"
  29 #include "msgbase.h"
  30 #include "support.h"
  31 #include "locate_host.h"
  32 #include "room_ops.h"
  33 #include "file_ops.h"
  34 #include "dynloader.h"
  35 #include "policy.h"
  36 #include "control.h"
  37 #include "tools.h"
  38
  39 struct CitContext *ContextList = NULL;
  40 char *unique_session_numbers;
  41 int ScheduledShutdown = 0;
  42 int do_defrag = 0;
  43
  44 /*
  45  * Various things that need to be initialized at startup
  46  */
  47 void master_startup(void) {
  48         lprintf(7, "Opening databases\n");
  49         open_databases();
  50
  51         if (do_defrag)
  52                 defrag_databases();
  53
  54         lprintf(7, "Checking floor reference counts\n");
  55         check_ref_counts();
  56
  57         lprintf(7, "Creating base rooms (if necessary)\n");
  58         create_room(BASEROOM, 0, "", 0);
  59         create_room(AIDEROOM, 4, "", 0);
  60         create_room(config.c_twitroom, 0, "", 0);
  61         }
  62
  63 /*
  64  * Cleanup routine to be called when the server is shutting down.
  65  */
  66 void master_cleanup(void) {
  67         struct CleanupFunctionHook *fcn;
  68
  69         /* Cancel all running sessions */
  70         lprintf(7, "Cancelling running sessions...\n");
  71
  72 /* FIX do something here
  73         while (ContextList != NULL) {
  74                 }
  75  */
  76
  77         /* Run any cleanup routines registered by loadable modules */
  78         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
  79                 (*fcn->h_function_pointer)();
  80                 }
  81
  82         /* Close databases */
  83         lprintf(7, "Closing databases\n");
  84         close_databases();
  85
  86         /* Do system-dependent stuff */
  87         sysdep_master_cleanup();
  88
  89         /* Now go away. */
  90         lprintf(3, "citserver: exiting.\n");
  91         fflush(stdout); fflush(stderr);
  92         exit(0);
  93         }
  94
  95
  96 /*
  97  * Free any per-session data allocated by modules or whatever
  98  */
  99 void deallocate_user_data(struct CitContext *con)
 100 {
 101         struct CtdlSessData *ptr;
 102
 103         begin_critical_section(S_SESSION_TABLE);
 104         while (con->FirstSessData != NULL) {
 105                 lprintf(9, "Deallocating user data symbol %ld\n",
 106                         con->FirstSessData->sym_id);
 107                 if (con->FirstSessData->sym_data != NULL)
 108                         phree(con->FirstSessData->sym_data);
 109                 ptr = con->FirstSessData->next;
 110                 phree(con->FirstSessData);
 111                 con->FirstSessData = ptr;
 112         }
 113         end_critical_section(S_SESSION_TABLE);
 114 }
 115
 116
 117
 118
 119 /*
 120  * Terminate a session and remove its context data structure.
 121  */
 122 void RemoveContext (struct CitContext *con)
 123 {
 124         struct CitContext *ptr = NULL;
 125         struct CitContext *ToFree = NULL;
 126
 127         lprintf(9, "RemoveContext() called\n");
 128         if (con==NULL) {
 129                 lprintf(5, "WARNING: RemoveContext() called with NULL!\n");
 130                 return;
 131                 }
 132
 133         /* Remove the context from the global context list.  This needs
 134          * to get done FIRST to avoid concurrency problems.  It is *vitally*
 135          * important to keep num_sessions accurate!!
 136          */
 137         lprintf(7, "Removing context for session %d\n", con->cs_pid);
 138         begin_critical_section(S_SESSION_TABLE);
 139         if (ContextList == con) {
 140                 ToFree = ContextList;
 141                 ContextList = ContextList->next;
 142                 --num_sessions;
 143                 }
 144         else {
 145                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 146                         if (ptr->next == con) {
 147                                 ToFree = ptr->next;
 148                                 ptr->next = ptr->next->next;
 149                                 --num_sessions;
 150                                 }
 151                         }
 152                 }
 153         end_critical_section(S_SESSION_TABLE);
 154
 155         if (ToFree == NULL) {
 156                 lprintf(9, "RemoveContext() found nothing to remove\n");
 157                 return;
 158         }
 159
 160         /* Now handle all of the administrivia. */
 161         lprintf(7, "Calling logout(%d)\n", con->cs_pid);
 162         logout(con);
 163
 164         rec_log(CL_TERMINATE, con->curr_user);
 165         unlink(con->temp);
 166         lprintf(3, "citserver[%3d]: ended.\n", con->cs_pid);
 167
 168         /* Run any cleanup routines registered by loadable modules */
 169         PerformSessionHooks(EVT_STOP);
 170
 171         syslog(LOG_NOTICE,"session %d ended", con->cs_pid);
 172
 173         /* Deallocate any user-data attached to this session */
 174         deallocate_user_data(con);
 175
 176         /* If the client is still connected, blow 'em away. */
 177         lprintf(7, "Closing socket %d\n", con->client_socket);
 178         close(con->client_socket);
 179
 180         /* Tell the housekeeping thread to check to see if this is the time
 181          * to initiate a scheduled shutdown event.
 182          */
 183         enter_housekeeping_cmd("SCHED_SHUTDOWN");
 184
 185         /* Free up the memory used by this context */
 186         phree(con);
 187
 188         lprintf(7, "Done with RemoveContext()\n");
 189 }
 190
 191
 192
 193 /*
 194  * Get a dynamic symbol number for per-session user data.
 195  * This API call should be made only ONCE per symbol per citserver run.
 196  */
 197 int CtdlGetDynamicSymbol()
 198 {
 199         static unsigned int next_symbol = SYM_MAX;
 200         return ++next_symbol;
 201 }
 202
 203
 204
 205 /*
 206  * Return a pointer to some generic per-session user data.
 207  * (This function returns NULL if the requested symbol is not allocated.)
 208  *
 209  * NOTE: we use critical sections for allocating and de-allocating these,
 210  *       but not for locating one.
 211  */
 212 void *CtdlGetUserData(unsigned long requested_sym)
 213 {
 214         struct CtdlSessData *ptr;
 215
 216         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 217                 if (ptr->sym_id == requested_sym)
 218                         return(ptr->sym_data);
 219
 220         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 221                 requested_sym);
 222         return NULL;
 223 }
 224
 225
 226 /*
 227  * Allocate some generic per-session user data.
 228  */
 229 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 230 {
 231         struct CtdlSessData *ptr;
 232
 233         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 234
 235         /* Fail silently if the symbol is already registered. */
 236         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 237                 if (ptr->sym_id == requested_sym) {
 238                         return;
 239                 }
 240         }
 241
 242         /* Grab us some memory!  Dem's good eatin' !!  */
 243         ptr = mallok(sizeof(struct CtdlSessData));
 244         ptr->sym_id = requested_sym;
 245         ptr->sym_data = mallok(num_bytes);
 246         memset(ptr->sym_data, 0, num_bytes);
 247
 248         begin_critical_section(S_SESSION_TABLE);
 249         ptr->next = CC->FirstSessData;
 250         CC->FirstSessData = ptr;
 251         end_critical_section(S_SESSION_TABLE);
 252
 253         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 254 }
 255
 256
 257 /*
 258  * Change the size of a buffer allocated with CtdlAllocUserData()
 259  */
 260 void CtdlReallocUserData(unsigned long requested_sym, size_t num_bytes)
 261 {
 262         struct CtdlSessData *ptr;
 263
 264         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 265                 if (ptr->sym_id == requested_sym) {
 266                         ptr->sym_data = reallok(ptr->sym_data, num_bytes);
 267                         return;
 268                 }
 269         }
 270
 271         lprintf(2, "CtdlReallocUserData() ERROR: symbol %ld not found!\n",
 272                 requested_sym);
 273 }
 274
 275
 276
 277
 278
 279
 280 /*
 281  * cmd_info()  -  tell the client about this server
 282  */
 283 void cmd_info(void) {
 284         cprintf("%d Server info:\n",LISTING_FOLLOWS);
 285         cprintf("%d\n",CC->cs_pid);
 286         cprintf("%s\n",config.c_nodename);
 287         cprintf("%s\n",config.c_humannode);
 288         cprintf("%s\n",config.c_fqdn);
 289         cprintf("%s\n",CITADEL);
 290         cprintf("%d\n",REV_LEVEL);
 291         cprintf("%s\n",config.c_bbs_city);
 292         cprintf("%s\n",config.c_sysadm);
 293         cprintf("%d\n",SERVER_TYPE);
 294         cprintf("%s\n",config.c_moreprompt);
 295         cprintf("1\n"); /* 1 = yes, this system supports floors */
 296         cprintf("1\n"); /* 1 = we support the extended paging options */
 297         cprintf("000\n");
 298         }
 299
 300 void cmd_rchg(char *argbuf)
 301 {
 302         char newroomname[256];
 303
 304         extract(newroomname, argbuf, 0);
 305         newroomname[ROOMNAMELEN-1] = 0;
 306         if (strlen(newroomname) > 0) {
 307                 safestrncpy(CC->fake_roomname, newroomname,
 308                         sizeof(CC->fake_roomname) );
 309                 }
 310         else {
 311                 strcpy(CC->fake_roomname, "");
 312                 }
 313         cprintf("%d OK\n", OK);
 314 }
 315
 316 void cmd_hchg(char *argbuf)
 317 {
 318         char newhostname[256];
 319
 320         extract(newhostname, argbuf, 0);
 321         if (strlen(newhostname) > 0) {
 322                 safestrncpy(CC->fake_hostname, newhostname,
 323                         sizeof(CC->fake_hostname) );
 324                 }
 325         else {
 326                 strcpy(CC->fake_hostname, "");
 327                 }
 328         cprintf("%d OK\n", OK);
 329 }
 330
 331 void cmd_uchg(char *argbuf)
 332 {
 333
 334         char newusername[256];
 335
 336         extract(newusername, argbuf, 0);
 337
 338         if (CC->usersupp.axlevel < 6) {
 339                 cprintf("%d You must be an Aide to masquerade your name.\n",
 340                         ERROR+HIGHER_ACCESS_REQUIRED);
 341                 return;
 342         }
 343
 344         if (strlen(newusername) > 0) {
 345                 CC->cs_flags &= ~CS_STEALTH;
 346                 memset(CC->fake_username, 0, 32);
 347                 if (strncasecmp(newusername, CC->curr_user,
 348                                 strlen(CC->curr_user)))
 349                         safestrncpy(CC->fake_username, newusername,
 350                                 sizeof(CC->fake_username));
 351         }
 352         else {
 353                 CC->fake_username[0] = '\0';
 354                 CC->cs_flags |= CS_STEALTH;
 355         }
 356         cprintf("%d\n",OK);
 357 }
 358
 359
 360
 361 /*
 362  * returns an asterisk if there are any express messages waiting,
 363  * space otherwise.
 364  */
 365 char check_express(void) {
 366         if (CC->FirstExpressMessage == NULL) {
 367                 return(' ');
 368                 }
 369         else {
 370                 return('*');
 371                 }
 372         }
 373
 374 void cmd_time(void)
 375 {
 376    time_t tv;
 377
 378    tv = time(NULL);
 379
 380    cprintf("%d %ld\n", OK, tv);
 381 }
 382
 383 /*
 384  * Check whether two hostnames match.
 385  * "Realname" should be an actual name of a client that is trying to connect;
 386  * "testname" should be the value we are comparing it with. The idea is that we
 387  * want to compare with both the abbreviated and fully-qualified versions of
 388  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 389  */
 390 static int hostnames_match(const char *realname, const char *testname) {
 391         struct hostent *he;
 392         int retval = 0;
 393
 394         if (!strcasecmp(realname, testname))
 395                 return 1;
 396
 397 #ifdef HAVE_NONREENTRANT_NETDB
 398         begin_critical_section(S_NETDB);
 399 #endif
 400
 401         if ((he = gethostbyname(testname)) != NULL)
 402                 if (!strcasecmp(realname, he->h_name))
 403                         retval = 1;
 404
 405 #ifdef HAVE_NONREENTRANT_NETDB
 406         end_critical_section(S_NETDB);
 407 #endif
 408
 409         return retval;
 410         }
 411
 412 /*
 413  * check a hostname against the public_clients file
 414  */
 415 int is_public_client(char *where)
 416 {
 417         char buf[256];
 418         FILE *fp;
 419
 420         if (hostnames_match(where,"localhost")) return(1);
 421         if (hostnames_match(where,config.c_fqdn)) return(1);
 422
 423         fp = fopen("public_clients","r");
 424         if (fp == NULL) return(0);
 425
 426         while (fgets(buf,256,fp)!=NULL) {
 427                 while (isspace((buf[strlen(buf)-1])))
 428                         buf[strlen(buf)-1] = 0;
 429                 if (hostnames_match(where,buf)) {
 430                         fclose(fp);
 431                         return(1);
 432                         }
 433                 }
 434
 435         fclose(fp);
 436         return(0);
 437         }
 438
 439
 440 /*
 441  * the client is identifying itself to the server
 442  */
 443 void cmd_iden(char *argbuf)
 444 {
 445         int dev_code;
 446         int cli_code;
 447         int rev_level;
 448         char desc[256];
 449         char from_host[256];
 450         struct in_addr addr;
 451
 452         if (num_parms(argbuf)<4) {
 453                 cprintf("%d usage error\n",ERROR);
 454                 return;
 455                 }
 456
 457         dev_code = extract_int(argbuf,0);
 458         cli_code = extract_int(argbuf,1);
 459         rev_level = extract_int(argbuf,2);
 460         extract(desc,argbuf,3);
 461
 462         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 463         from_host[sizeof from_host - 1] = 0;
 464         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 465
 466         CC->cs_clientdev = dev_code;
 467         CC->cs_clienttyp = cli_code;
 468         CC->cs_clientver = rev_level;
 469         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 470         CC->cs_clientname[31] = 0;
 471
 472         lprintf(9, "Looking up hostname '%s'\n", from_host);
 473         if ((strlen(from_host)>0) &&
 474            (is_public_client(CC->cs_host))) {
 475                 if ((addr.s_addr = inet_addr(from_host)) != INADDR_NONE)
 476                         locate_host(CC->cs_host, &addr);
 477                 else {
 478                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 479                         CC->cs_host[24] = 0;
 480                         }
 481                 }
 482
 483         syslog(LOG_NOTICE,"client %d/%d/%01d.%02d (%s)\n",
 484                 dev_code,
 485                 cli_code,
 486                 (rev_level / 100),
 487                 (rev_level % 100),
 488                 desc);
 489                 cprintf("%d Ok\n",OK);
 490         }
 491
 492
 493 /*
 494  * enter or exit "stealth mode"
 495  */
 496 void cmd_stel(char *cmdbuf)
 497 {
 498         int requested_mode;
 499
 500         requested_mode = extract_int(cmdbuf,0);
 501         if (requested_mode !=0) requested_mode = 1;
 502
 503         if (!CC->logged_in) {
 504                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 505                 return;
 506                 }
 507
 508         if (CC->usersupp.axlevel < 6) {
 509                 cprintf("%d You must be an Aide to use stealth mode.\n",
 510                         ERROR+HIGHER_ACCESS_REQUIRED);
 511                 return;
 512                 }
 513
 514         if (CC->cs_flags & CS_STEALTH) {
 515                 if (requested_mode == 0)
 516                         CC->cs_flags = CC->cs_flags-CS_STEALTH;
 517                 }
 518         else {
 519                 if (requested_mode == 1)
 520                         CC->cs_flags = CC->cs_flags|CS_STEALTH;
 521                 }
 522
 523         cprintf("%d Ok\n",OK);
 524         }
 525
 526
 527
 528
 529 /*
 530  * display system messages or help
 531  */
 532 void cmd_mesg(char *mname)
 533 {
 534         FILE *mfp;
 535         char targ[256];
 536         char buf[256];
 537         char *dirs[2];
 538
 539         extract(buf,mname,0);
 540
 541
 542         dirs[0]=mallok(64);
 543         dirs[1]=mallok(64);
 544         strcpy(dirs[0],"messages");
 545         strcpy(dirs[1],"help");
 546         mesg_locate(targ,buf,2,dirs);
 547         phree(dirs[0]);
 548         phree(dirs[1]);
 549
 550
 551         if (strlen(targ)==0) {
 552                 cprintf("%d '%s' not found.\n",ERROR,mname);
 553                 return;
 554                 }
 555
 556         mfp = fopen(targ,"r");
 557         if (mfp==NULL) {
 558                 cprintf("%d Cannot open '%s': %s\n",
 559                         ERROR,targ,strerror(errno));
 560                 return;
 561                 }
 562         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 563
 564         while (fgets(buf,255,mfp)!=NULL) {
 565                 buf[strlen(buf)-1] = 0;
 566                 do_help_subst(buf);
 567                 cprintf("%s\n",buf);
 568                 }
 569
 570         fclose(mfp);
 571         cprintf("000\n");
 572         }
 573
 574
 575 /*
 576  * enter system messages or help
 577  */
 578 void cmd_emsg(char *mname)
 579 {
 580         FILE *mfp;
 581         char targ[256];
 582         char buf[256];
 583         char *dirs[2];
 584         int a;
 585
 586         if (CC->usersupp.axlevel < 6) {
 587                 cprintf("%d You must be an Aide to edit system messages.\n",
 588                         ERROR+HIGHER_ACCESS_REQUIRED);
 589                 return;
 590                 }
 591
 592         extract(buf,mname,0);
 593         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 594                 if (buf[a] == '/') buf[a] = '.';
 595                 }
 596
 597         dirs[0]=mallok(64);
 598         dirs[1]=mallok(64);
 599         strcpy(dirs[0],"messages");
 600         strcpy(dirs[1],"help");
 601         mesg_locate(targ,buf,2,dirs);
 602         phree(dirs[0]);
 603         phree(dirs[1]);
 604
 605         if (strlen(targ)==0) {
 606                 snprintf(targ, sizeof targ, "./help/%s", buf);
 607                 }
 608
 609         mfp = fopen(targ,"w");
 610         if (mfp==NULL) {
 611                 cprintf("%d Cannot open '%s': %s\n",
 612                         ERROR,targ,strerror(errno));
 613                 return;
 614                 }
 615         cprintf("%d %s\n", SEND_LISTING, targ);
 616
 617         while (client_gets(buf), strcmp(buf, "000")) {
 618                 fprintf(mfp, "%s\n", buf);
 619                 }
 620
 621         fclose(mfp);
 622         }
 623
 624
 625 /* Don't show the names of private rooms unless the viewing
 626  * user also knows the rooms.
 627  */
 628 void GenerateRoomDisplay(char *real_room,
 629                         struct CitContext *viewed,
 630                         struct CitContext *viewer) {
 631
 632         strcpy(real_room, viewed->quickroom.QRname);
 633         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 634                 strcpy(real_room, &real_room[11]);
 635         }
 636         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 637                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 638                    & UA_KNOWN) == 0) {
 639                         strcpy(real_room, "<private room>");
 640                 }
 641         }
 642
 643         if (viewed->cs_flags & CS_CHAT) {
 644                 while (strlen(real_room) < 14)
 645                         strcat(real_room, " ");
 646
 647                 strcpy(&real_room[14], "<chat>");
 648         }
 649
 650 }
 651
 652
 653 /*
 654  * who's online
 655  */
 656 void cmd_rwho(void) {
 657         struct CitContext *cptr;
 658         int spoofed = 0;
 659         int aide;
 660         char un[40];
 661         char real_room[ROOMNAMELEN], room[ROOMNAMELEN];
 662         char host[40], flags[5];
 663
 664         aide = CC->usersupp.axlevel >= 6;
 665         cprintf("%d%c \n", LISTING_FOLLOWS, check_express() );
 666
 667         for (cptr = ContextList; cptr != NULL; cptr = cptr->next)
 668         {
 669                 flags[0] = '\0';
 670                 spoofed = 0;
 671
 672                 if (cptr->cs_flags & CS_POSTING)
 673                    strcat(flags, "*");
 674                 else
 675                    strcat(flags, ".");
 676
 677                 if (cptr->fake_username[0])
 678                 {
 679                    strcpy(un, cptr->fake_username);
 680                    spoofed = 1;
 681                 }
 682                 else
 683                    strcpy(un, cptr->curr_user);
 684
 685                 if (cptr->fake_hostname[0])
 686                 {
 687                    strcpy(host, cptr->fake_hostname);
 688                    spoofed = 1;
 689                 }
 690                 else
 691                    strcpy(host, cptr->cs_host);
 692
 693                 GenerateRoomDisplay(real_room, cptr, CC);
 694
 695                 if (cptr->fake_roomname[0]) {
 696                         strcpy(room, cptr->fake_roomname);
 697                         spoofed = 1;
 698                 }
 699                 else {
 700                         strcpy(room, real_room);
 701                 }
 702
 703                 if ((aide) && (spoofed))
 704                    strcat(flags, "+");
 705
 706                 if ((cptr->cs_flags & CS_STEALTH) && (aide))
 707                    strcat(flags, "-");
 708
 709                 if (((cptr->cs_flags&CS_STEALTH)==0) || (aide))
 710                 {
 711                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 712                                 cptr->cs_pid, un, room,
 713                                 host, cptr->cs_clientname,
 714                                 (long)(cptr->lastidle),
 715                                 cptr->lastcmdname, flags);
 716                 }
 717                 if ((spoofed) && (aide))
 718                 {
 719                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 720                                 cptr->cs_pid, cptr->curr_user,
 721                                 real_room,
 722                                 cptr->cs_host, cptr->cs_clientname,
 723                                 (long)(cptr->lastidle),
 724                                 cptr->lastcmdname, flags);
 725
 726                 }
 727         }
 728
 729         /* Now it's magic time.  Before we finish, call any EVT_RWHO hooks
 730          * so that external paging modules such as serv_icq can add more
 731          * content to the Wholist.
 732          */
 733         PerformSessionHooks(EVT_RWHO);
 734         cprintf("000\n");
 735         }
 736
 737
 738 /*
 739  * Terminate another running session
 740  */
 741 void cmd_term(char *cmdbuf)
 742 {
 743         int session_num;
 744         struct CitContext *ccptr;
 745         int found_it = 0;
 746
 747         if (!CC->logged_in) {
 748                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 749                 return;
 750                 }
 751
 752         if (CC->usersupp.axlevel < 6) {
 753                 cprintf("%d You must be an Aide to terminate sessions.\n",
 754                         ERROR+HIGHER_ACCESS_REQUIRED);
 755                 return;
 756                 }
 757
 758         session_num = extract_int(cmdbuf, 0);
 759         if (session_num == CC->cs_pid) {
 760                 cprintf("%d You can't kill your own session.\n", ERROR);
 761                 return;
 762                 }
 763
 764         lprintf(9, "Locating session to kill\n");
 765         begin_critical_section(S_SESSION_TABLE);
 766         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 767                 if (session_num == ccptr->cs_pid) {
 768                         ccptr->kill_me = 1;
 769                         found_it = 1;
 770                         }
 771                 }
 772         end_critical_section(S_SESSION_TABLE);
 773
 774         if (found_it) {
 775                 cprintf("%d Session terminated.\n", OK);
 776                 }
 777         else {
 778                 cprintf("%d No such session.\n", ERROR);
 779                 }
 780         }
 781
 782
 783
 784
 785
 786 /*
 787  * get the paginator prompt
 788  */
 789 void cmd_more(void) {
 790         cprintf("%d %s\n",OK,config.c_moreprompt);
 791         }
 792
 793 /*
 794  * echo
 795  */
 796 void cmd_echo(char *etext)
 797 {
 798         cprintf("%d %s\n",OK,etext);
 799         }
 800
 801
 802
 803 /*
 804  * identify as internal program
 805  */
 806 void cmd_ipgm(char *argbuf)
 807 {
 808         int secret;
 809
 810         secret = extract_int(argbuf, 0);
 811         if (secret == config.c_ipgm_secret) {
 812                 CC->internal_pgm = 1;
 813                 strcpy(CC->curr_user, "<internal program>");
 814                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 815                 cprintf("%d Authenticated as an internal program.\n",OK);
 816                 }
 817         else {
 818                 cprintf("%d Authentication failed.\n",ERROR);
 819                 lprintf(3, "Warning: ipgm authentication failed.\n");
 820                 }
 821         }
 822
 823
 824 /*
 825  * Shut down the server
 826  */
 827 void cmd_down(void) {
 828         if (!CC->logged_in) {
 829                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 830                 return;
 831                 }
 832
 833         if (CC->usersupp.axlevel < 6) {
 834                 cprintf("%d You must be an Aide to shut down the server.\n",
 835                         ERROR+HIGHER_ACCESS_REQUIRED);
 836                 return;
 837                 }
 838
 839         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 840         master_cleanup();
 841         }
 842
 843 /*
 844  * Schedule or cancel a server shutdown
 845  */
 846 void cmd_scdn(char *argbuf)
 847 {
 848         int new_state;
 849
 850         if (!CC->logged_in) {
 851                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 852                 return;
 853                 }
 854
 855         if (CC->usersupp.axlevel < 6) {
 856                 cprintf("%d You must be an Aide to schedule a shutdown.\n",
 857                         ERROR+HIGHER_ACCESS_REQUIRED);
 858                 return;
 859                 }
 860
 861         new_state = extract_int(argbuf, 0);
 862         if ((new_state == 0) || (new_state == 1)) {
 863                 ScheduledShutdown = new_state;
 864                 }
 865         cprintf("%d %d\n", OK, ScheduledShutdown);
 866         }
 867
 868
 869 /*
 870  * Back-end function for starting a session
 871  */
 872 void begin_session(struct CitContext *con)
 873 {
 874         int len;
 875         struct sockaddr_in sin;
 876
 877         /*
 878          * Initialize some variables specific to our context.
 879          */
 880         con->logged_in = 0;
 881         con->internal_pgm = 0;
 882         con->download_fp = NULL;
 883         con->upload_fp = NULL;
 884         con->FirstExpressMessage = NULL;
 885         time(&con->lastcmd);
 886         time(&con->lastidle);
 887         strcpy(con->lastcmdname, "    ");
 888         strcpy(con->cs_clientname, "(unknown)");
 889         strcpy(con->curr_user, NLI);
 890         strcpy(con->net_node,"");
 891         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 892         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 893         con->cs_host[sizeof con->cs_host - 1] = 0;
 894         len = sizeof sin;
 895         if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len))
 896                 locate_host(con->cs_host, &sin.sin_addr);
 897         con->cs_flags = 0;
 898         con->upload_type = UPL_FILE;
 899         con->dl_is_net = 0;
 900         con->FirstSessData = NULL;
 901
 902         con->nologin = 0;
 903         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 904                 con->nologin = 1;
 905
 906         lprintf(3, "citserver[%3d]: started.\n", con->cs_pid);
 907
 908         /* Run any session startup routines registered by loadable modules */
 909         PerformSessionHooks(EVT_START);
 910
 911         rec_log(CL_CONNECT, "");
 912 }
 913
 914
 915 void citproto_begin_session() {
 916         if (CC->nologin==1) {
 917                 cprintf("%d %s: Too many users are already online "
 918                         "(maximum is %d)\n",
 919                         ERROR+MAX_SESSIONS_EXCEEDED,
 920                         config.c_nodename, config.c_maxsessions);
 921                 }
 922         else {
 923                 cprintf("%d %s Citadel/UX server ready.\n",
 924                         OK, config.c_nodename);
 925                 }
 926 }
 927
 928
 929
 930
 931 /*
 932  * This loop recognizes all server commands.
 933  */
 934 void do_command_loop(void) {
 935         char cmdbuf[256];
 936
 937         time(&CC->lastcmd);
 938         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 939         if (client_gets(cmdbuf) < 1) {
 940                 lprintf(3, "Client socket is broken.  Ending session.\n");
 941                 CC->kill_me = 1;
 942                 return;
 943         }
 944         lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 945
 946         /*
 947          * Let other clients see the last command we executed, and
 948          * update the idle time, but not NOOP, PEXP, or GEXP.
 949          */
 950         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 951            && (strncasecmp(cmdbuf, "PEXP", 4))
 952            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 953                 strcpy(CC->lastcmdname, "    ");
 954                 safestrncpy(CC->lastcmdname, cmdbuf,
 955                         sizeof(CC->lastcmdname) );
 956                 time(&CC->lastidle);
 957                 }
 958
 959         if ((strncasecmp(cmdbuf, "ENT0", 4))
 960            && (strncasecmp(cmdbuf, "MESG", 4))
 961            && (strncasecmp(cmdbuf, "MSGS", 4)))
 962         {
 963            CC->cs_flags &= ~CS_POSTING;
 964         }
 965
 966         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 967                 cprintf("%d%cok\n",OK,check_express());
 968                 }
 969
 970         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 971                 cprintf("%d Goodbye.\n",OK);
 972                 CC->kill_me = 1;
 973                 }
 974
 975         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 976                 if (CC->logged_in) logout(CC);
 977                 cprintf("%d logged out.\n",OK);
 978                 }
 979
 980         else if (!strncasecmp(cmdbuf,"USER",4)) {
 981                 cmd_user(&cmdbuf[5]);
 982                 }
 983
 984         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 985                 cmd_pass(&cmdbuf[5]);
 986                 }
 987
 988         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 989                 cmd_newu(&cmdbuf[5]);
 990                 }
 991
 992         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 993                 cmd_setp(&cmdbuf[5]);
 994                 }
 995
 996         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 997                 cmd_lrms(&cmdbuf[5]);
 998                 }
 999
1000         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
1001                 cmd_lkra(&cmdbuf[5]);
1002                 }
1003
1004         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
1005                 cmd_lkrn(&cmdbuf[5]);
1006                 }
1007
1008         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
1009                 cmd_lkro(&cmdbuf[5]);
1010                 }
1011
1012         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
1013                 cmd_lzrm(&cmdbuf[5]);
1014                 }
1015
1016         else if (!strncasecmp(cmdbuf,"GETU",4)) {
1017                 cmd_getu();
1018                 }
1019
1020         else if (!strncasecmp(cmdbuf,"SETU",4)) {
1021                 cmd_setu(&cmdbuf[5]);
1022                 }
1023
1024         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1025                 cmd_goto(&cmdbuf[5]);
1026                 }
1027
1028         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1029                 cmd_msgs(&cmdbuf[5]);
1030                 }
1031
1032         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1033                 cmd_whok();
1034                 }
1035
1036         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1037                 cmd_rdir();
1038                 }
1039
1040         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1041                 cmd_msg0(&cmdbuf[5]);
1042                 }
1043
1044         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1045                 cmd_msg2(&cmdbuf[5]);
1046                 }
1047
1048         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1049                 cmd_msg3(&cmdbuf[5]);
1050                 }
1051
1052         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1053                 cmd_msg4(&cmdbuf[5]);
1054                 }
1055
1056         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1057                 cmd_opna(&cmdbuf[5]);
1058                 }
1059
1060         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1061                 cmd_info();
1062                 }
1063
1064         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1065                 cmd_slrp(&cmdbuf[5]);
1066                 }
1067
1068         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1069                 cmd_invt_kick(&cmdbuf[5],1);
1070                 }
1071
1072         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1073                 cmd_invt_kick(&cmdbuf[5],0);
1074                 }
1075
1076         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1077                 cmd_getr();
1078                 }
1079
1080         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1081                 cmd_setr(&cmdbuf[5]);
1082                 }
1083
1084         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1085                 cmd_geta();
1086                 }
1087
1088         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1089                 cmd_seta(&cmdbuf[5]);
1090                 }
1091
1092         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1093                 cmd_ent0(&cmdbuf[5]);
1094                 }
1095
1096         else if (!strncasecmp(cmdbuf,"ENT3",4)) {
1097                 cmd_ent3(&cmdbuf[5]);
1098                 }
1099
1100         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1101                 cmd_rinf();
1102                 }
1103
1104         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1105                 cmd_dele(&cmdbuf[5]);
1106                 }
1107
1108         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1109                 cmd_kill(&cmdbuf[5]);
1110                 }
1111
1112         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1113                 cmd_cre8(&cmdbuf[5]);
1114                 }
1115
1116         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1117                 cmd_move(&cmdbuf[5]);
1118                 }
1119
1120         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1121                 cmd_forg();
1122                 }
1123
1124         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1125                 cmd_mesg(&cmdbuf[5]);
1126                 }
1127
1128         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1129                 cmd_emsg(&cmdbuf[5]);
1130                 }
1131
1132         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1133                 cmd_gnur();
1134                 }
1135
1136         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1137                 cmd_vali(&cmdbuf[5]);
1138                 }
1139
1140         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1141                 cmd_einf(&cmdbuf[5]);
1142                 }
1143
1144         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1145                 cmd_list();
1146                 }
1147
1148         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1149                 cmd_chek();
1150                 }
1151
1152         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1153                 cmd_delf(&cmdbuf[5]);
1154                 }
1155
1156         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1157                 cmd_movf(&cmdbuf[5]);
1158                 }
1159
1160         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1161                 cmd_netf(&cmdbuf[5]);
1162                 }
1163
1164         else if (!strncasecmp(cmdbuf,"RWHO",4)) {
1165                 cmd_rwho();
1166                 }
1167
1168         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1169                 cmd_open(&cmdbuf[5]);
1170                 }
1171
1172         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1173                 cmd_clos();
1174                 }
1175
1176         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1177                 cmd_uopn(&cmdbuf[5]);
1178                 }
1179
1180         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1181                 cmd_ucls(&cmdbuf[5]);
1182                 }
1183
1184         else if (!strncasecmp(cmdbuf,"READ",4)) {
1185                 cmd_read(&cmdbuf[5]);
1186                 }
1187
1188         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1189                 cmd_writ(&cmdbuf[5]);
1190                 }
1191
1192         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1193                 cmd_qusr(&cmdbuf[5]);
1194                 }
1195
1196         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1197                 cmd_echo(&cmdbuf[5]);
1198                 }
1199
1200         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1201                 cmd_oimg(&cmdbuf[5]);
1202                 }
1203
1204         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1205                 cmd_more();
1206                 }
1207
1208         else if (!strncasecmp(cmdbuf,"NETP",4)) {
1209                 cmd_netp(&cmdbuf[5]);
1210                 }
1211
1212         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1213                 cmd_ndop(&cmdbuf[5]);
1214                 }
1215
1216         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1217                 cmd_nuop(&cmdbuf[5]);
1218                 }
1219
1220         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1221                 cmd_lflr();
1222                 }
1223
1224         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1225                 cmd_cflr(&cmdbuf[5]);
1226                 }
1227
1228         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1229                 cmd_kflr(&cmdbuf[5]);
1230                 }
1231
1232         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1233                 cmd_eflr(&cmdbuf[5]);
1234                 }
1235
1236         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1237                 cmd_iden(&cmdbuf[5]);
1238                 }
1239
1240         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1241                 cmd_ipgm(&cmdbuf[5]);
1242                 }
1243
1244         else if (!strncasecmp(cmdbuf,"EBIO",4)) {
1245                 cmd_ebio();
1246                 }
1247
1248         else if (!strncasecmp(cmdbuf,"RBIO",4)) {
1249                 cmd_rbio(&cmdbuf[5]);
1250                 }
1251
1252         else if (!strncasecmp(cmdbuf,"LBIO",4)) {
1253                 cmd_lbio();
1254                 }
1255
1256         else if (!strncasecmp(cmdbuf,"STEL",4)) {
1257                 cmd_stel(&cmdbuf[5]);
1258                 }
1259
1260         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1261                 cmd_term(&cmdbuf[5]);
1262                 }
1263
1264         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1265                 cmd_down();
1266                 }
1267
1268         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1269                 cmd_scdn(&cmdbuf[5]);
1270                 }
1271
1272         else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1273                 cmd_nset(&cmdbuf[5]);
1274                 }
1275
1276         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1277                 cmd_uimg(&cmdbuf[5]);
1278                 }
1279
1280         else if (!strncasecmp(cmdbuf, "UCHG", 4)) {
1281                 cmd_uchg(&cmdbuf[5]);
1282                 }
1283
1284         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1285                 cmd_time();
1286                 }
1287
1288         else if (!strncasecmp(cmdbuf, "HCHG", 4)) {
1289                 cmd_hchg(&cmdbuf[5]);
1290                 }
1291
1292         else if (!strncasecmp(cmdbuf, "RCHG", 4)) {
1293                 cmd_rchg(&cmdbuf[5]);
1294                 }
1295
1296         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1297                 cmd_agup(&cmdbuf[5]);
1298                 }
1299
1300         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1301                 cmd_asup(&cmdbuf[5]);
1302                 }
1303
1304         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1305                 cmd_gpex(&cmdbuf[5]);
1306                 }
1307
1308         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1309                 cmd_spex(&cmdbuf[5]);
1310                 }
1311
1312         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1313                 cmd_conf(&cmdbuf[5]);
1314                 }
1315
1316 #ifdef DEBUG_MEMORY_LEAKS
1317         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1318                 dump_tracked();
1319                 }
1320 #endif
1321
1322         else if (!DLoader_Exec_Cmd(cmdbuf))
1323                 {
1324                    cprintf("%d Unrecognized or unsupported command.\n",
1325                             ERROR);
1326                 }
1327
1328         /* Run any after-each-command outines registered by modules */
1329         PerformSessionHooks(EVT_CMD);
1330 }