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(SYSCONFIGROOM,      4, "", 0);
  61         create_room(config.c_twitroom,  0, "", 0);
  62         }
  63
  64 /*
  65  * Cleanup routine to be called when the server is shutting down.
  66  */
  67 void master_cleanup(void) {
  68         struct CleanupFunctionHook *fcn;
  69
  70         /* Cancel all running sessions */
  71         lprintf(7, "Cancelling running sessions...\n");
  72
  73 /* FIX do something here
  74         while (ContextList != NULL) {
  75                 }
  76  */
  77
  78         /* Run any cleanup routines registered by loadable modules */
  79         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
  80                 (*fcn->h_function_pointer)();
  81                 }
  82
  83         /* Close databases */
  84         lprintf(7, "Closing databases\n");
  85         close_databases();
  86
  87         /* Do system-dependent stuff */
  88         sysdep_master_cleanup();
  89
  90         /* Now go away. */
  91         lprintf(3, "citserver: exiting.\n");
  92         fflush(stdout); fflush(stderr);
  93         exit(0);
  94         }
  95
  96
  97 /*
  98  * Free any per-session data allocated by modules or whatever
  99  */
 100 void deallocate_user_data(struct CitContext *con)
 101 {
 102         struct CtdlSessData *ptr;
 103
 104         begin_critical_section(S_SESSION_TABLE);
 105         while (con->FirstSessData != NULL) {
 106                 lprintf(9, "Deallocating user data symbol %ld\n",
 107                         con->FirstSessData->sym_id);
 108                 if (con->FirstSessData->sym_data != NULL)
 109                         phree(con->FirstSessData->sym_data);
 110                 ptr = con->FirstSessData->next;
 111                 phree(con->FirstSessData);
 112                 con->FirstSessData = ptr;
 113         }
 114         end_critical_section(S_SESSION_TABLE);
 115 }
 116
 117
 118
 119
 120 /*
 121  * Terminate a session and remove its context data structure.
 122  */
 123 void RemoveContext (struct CitContext *con)
 124 {
 125         struct CitContext *ptr = NULL;
 126         struct CitContext *ToFree = NULL;
 127
 128         lprintf(9, "RemoveContext() called\n");
 129         if (con==NULL) {
 130                 lprintf(5, "WARNING: RemoveContext() called with NULL!\n");
 131                 return;
 132                 }
 133
 134         /* Remove the context from the global context list.  This needs
 135          * to get done FIRST to avoid concurrency problems.  It is *vitally*
 136          * important to keep num_sessions accurate!!
 137          */
 138         lprintf(7, "Removing context for session %d\n", con->cs_pid);
 139         begin_critical_section(S_SESSION_TABLE);
 140         if (ContextList == con) {
 141                 ToFree = ContextList;
 142                 ContextList = ContextList->next;
 143                 --num_sessions;
 144                 }
 145         else {
 146                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 147                         if (ptr->next == con) {
 148                                 ToFree = ptr->next;
 149                                 ptr->next = ptr->next->next;
 150                                 --num_sessions;
 151                                 }
 152                         }
 153                 }
 154         end_critical_section(S_SESSION_TABLE);
 155
 156         if (ToFree == NULL) {
 157                 lprintf(9, "RemoveContext() found nothing to remove\n");
 158                 return;
 159         }
 160
 161         /* Now handle all of the administrivia. */
 162         lprintf(7, "Calling logout(%d)\n", con->cs_pid);
 163         logout(con);
 164
 165         rec_log(CL_TERMINATE, con->curr_user);
 166         unlink(con->temp);
 167         lprintf(3, "citserver[%3d]: ended.\n", con->cs_pid);
 168
 169         /* Run any cleanup routines registered by loadable modules */
 170         PerformSessionHooks(EVT_STOP);
 171
 172         syslog(LOG_NOTICE,"session %d ended", con->cs_pid);
 173
 174         /* Deallocate any user-data attached to this session */
 175         deallocate_user_data(con);
 176
 177         /* If the client is still connected, blow 'em away. */
 178         lprintf(7, "Closing socket %d\n", con->client_socket);
 179         close(con->client_socket);
 180
 181         /* Tell the housekeeping thread to check to see if this is the time
 182          * to initiate a scheduled shutdown event.
 183          */
 184         enter_housekeeping_cmd("SCHED_SHUTDOWN");
 185
 186         /* Free up the memory used by this context */
 187         phree(con);
 188
 189         lprintf(7, "Done with RemoveContext()\n");
 190 }
 191
 192
 193
 194 /*
 195  * Get a dynamic symbol number for per-session user data.
 196  * This API call should be made only ONCE per symbol per citserver run.
 197  */
 198 int CtdlGetDynamicSymbol()
 199 {
 200         static unsigned int next_symbol = SYM_MAX;
 201         return ++next_symbol;
 202 }
 203
 204
 205
 206 /*
 207  * Return a pointer to some generic per-session user data.
 208  * (This function returns NULL if the requested symbol is not allocated.)
 209  *
 210  * NOTE: we use critical sections for allocating and de-allocating these,
 211  *       but not for locating one.
 212  */
 213 void *CtdlGetUserData(unsigned long requested_sym)
 214 {
 215         struct CtdlSessData *ptr;
 216
 217         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)
 218                 if (ptr->sym_id == requested_sym)
 219                         return(ptr->sym_data);
 220
 221         lprintf(2, "ERROR! CtdlGetUserData(%ld) symbol not allocated\n",
 222                 requested_sym);
 223         return NULL;
 224 }
 225
 226
 227 /*
 228  * Allocate some generic per-session user data.
 229  */
 230 void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes)
 231 {
 232         struct CtdlSessData *ptr;
 233
 234         lprintf(9, "CtdlAllocUserData(%ld) called\n", requested_sym);
 235
 236         /* Fail silently if the symbol is already registered. */
 237         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 238                 if (ptr->sym_id == requested_sym) {
 239                         return;
 240                 }
 241         }
 242
 243         /* Grab us some memory!  Dem's good eatin' !!  */
 244         ptr = mallok(sizeof(struct CtdlSessData));
 245         ptr->sym_id = requested_sym;
 246         ptr->sym_data = mallok(num_bytes);
 247         memset(ptr->sym_data, 0, num_bytes);
 248
 249         begin_critical_section(S_SESSION_TABLE);
 250         ptr->next = CC->FirstSessData;
 251         CC->FirstSessData = ptr;
 252         end_critical_section(S_SESSION_TABLE);
 253
 254         lprintf(9, "CtdlAllocUserData(%ld) finished\n", requested_sym);
 255 }
 256
 257
 258 /*
 259  * Change the size of a buffer allocated with CtdlAllocUserData()
 260  */
 261 void CtdlReallocUserData(unsigned long requested_sym, size_t num_bytes)
 262 {
 263         struct CtdlSessData *ptr;
 264
 265         for (ptr = CC->FirstSessData; ptr != NULL; ptr = ptr->next)  {
 266                 if (ptr->sym_id == requested_sym) {
 267                         ptr->sym_data = reallok(ptr->sym_data, num_bytes);
 268                         return;
 269                 }
 270         }
 271
 272         lprintf(2, "CtdlReallocUserData() ERROR: symbol %ld not found!\n",
 273                 requested_sym);
 274 }
 275
 276
 277
 278
 279
 280
 281 /*
 282  * cmd_info()  -  tell the client about this server
 283  */
 284 void cmd_info(void) {
 285         cprintf("%d Server info:\n",LISTING_FOLLOWS);
 286         cprintf("%d\n",CC->cs_pid);
 287         cprintf("%s\n",config.c_nodename);
 288         cprintf("%s\n",config.c_humannode);
 289         cprintf("%s\n",config.c_fqdn);
 290         cprintf("%s\n",CITADEL);
 291         cprintf("%d\n",REV_LEVEL);
 292         cprintf("%s\n",config.c_bbs_city);
 293         cprintf("%s\n",config.c_sysadm);
 294         cprintf("%d\n",SERVER_TYPE);
 295         cprintf("%s\n",config.c_moreprompt);
 296         cprintf("1\n"); /* 1 = yes, this system supports floors */
 297         cprintf("1\n"); /* 1 = we support the extended paging options */
 298         cprintf("000\n");
 299         }
 300
 301 void cmd_rchg(char *argbuf)
 302 {
 303         char newroomname[256];
 304
 305         extract(newroomname, argbuf, 0);
 306         newroomname[ROOMNAMELEN-1] = 0;
 307         if (strlen(newroomname) > 0) {
 308                 safestrncpy(CC->fake_roomname, newroomname,
 309                         sizeof(CC->fake_roomname) );
 310                 }
 311         else {
 312                 strcpy(CC->fake_roomname, "");
 313                 }
 314         cprintf("%d OK\n", OK);
 315 }
 316
 317 void cmd_hchg(char *argbuf)
 318 {
 319         char newhostname[256];
 320
 321         extract(newhostname, argbuf, 0);
 322         if (strlen(newhostname) > 0) {
 323                 safestrncpy(CC->fake_hostname, newhostname,
 324                         sizeof(CC->fake_hostname) );
 325                 }
 326         else {
 327                 strcpy(CC->fake_hostname, "");
 328                 }
 329         cprintf("%d OK\n", OK);
 330 }
 331
 332 void cmd_uchg(char *argbuf)
 333 {
 334
 335         char newusername[256];
 336
 337         extract(newusername, argbuf, 0);
 338
 339         if (CC->usersupp.axlevel < 6) {
 340                 cprintf("%d You must be an Aide to masquerade your name.\n",
 341                         ERROR+HIGHER_ACCESS_REQUIRED);
 342                 return;
 343         }
 344
 345         if (strlen(newusername) > 0) {
 346                 CC->cs_flags &= ~CS_STEALTH;
 347                 memset(CC->fake_username, 0, 32);
 348                 if (strncasecmp(newusername, CC->curr_user,
 349                                 strlen(CC->curr_user)))
 350                         safestrncpy(CC->fake_username, newusername,
 351                                 sizeof(CC->fake_username));
 352         }
 353         else {
 354                 CC->fake_username[0] = '\0';
 355                 CC->cs_flags |= CS_STEALTH;
 356         }
 357         cprintf("%d\n",OK);
 358 }
 359
 360
 361
 362 /*
 363  * returns an asterisk if there are any express messages waiting,
 364  * space otherwise.
 365  */
 366 char check_express(void) {
 367         if (CC->FirstExpressMessage == NULL) {
 368                 return(' ');
 369                 }
 370         else {
 371                 return('*');
 372                 }
 373         }
 374
 375 void cmd_time(void)
 376 {
 377    time_t tv;
 378
 379    tv = time(NULL);
 380
 381    cprintf("%d %ld\n", OK, tv);
 382 }
 383
 384 /*
 385  * Check whether two hostnames match.
 386  * "Realname" should be an actual name of a client that is trying to connect;
 387  * "testname" should be the value we are comparing it with. The idea is that we
 388  * want to compare with both the abbreviated and fully-qualified versions of
 389  * "testname;" some people define "localhost" as "localhost.foo.com," etc.
 390  */
 391 static int hostnames_match(const char *realname, const char *testname) {
 392         struct hostent *he;
 393         int retval = 0;
 394
 395         if (!strcasecmp(realname, testname))
 396                 return 1;
 397
 398 #ifdef HAVE_NONREENTRANT_NETDB
 399         begin_critical_section(S_NETDB);
 400 #endif
 401
 402         if ((he = gethostbyname(testname)) != NULL)
 403                 if (!strcasecmp(realname, he->h_name))
 404                         retval = 1;
 405
 406 #ifdef HAVE_NONREENTRANT_NETDB
 407         end_critical_section(S_NETDB);
 408 #endif
 409
 410         return retval;
 411         }
 412
 413 /*
 414  * check a hostname against the public_clients file
 415  */
 416 int is_public_client(char *where)
 417 {
 418         char buf[256];
 419         FILE *fp;
 420
 421         if (hostnames_match(where,"localhost")) return(1);
 422         if (hostnames_match(where,config.c_fqdn)) return(1);
 423
 424         fp = fopen("public_clients","r");
 425         if (fp == NULL) return(0);
 426
 427         while (fgets(buf,256,fp)!=NULL) {
 428                 while (isspace((buf[strlen(buf)-1])))
 429                         buf[strlen(buf)-1] = 0;
 430                 if (hostnames_match(where,buf)) {
 431                         fclose(fp);
 432                         return(1);
 433                         }
 434                 }
 435
 436         fclose(fp);
 437         return(0);
 438         }
 439
 440
 441 /*
 442  * the client is identifying itself to the server
 443  */
 444 void cmd_iden(char *argbuf)
 445 {
 446         int dev_code;
 447         int cli_code;
 448         int rev_level;
 449         char desc[256];
 450         char from_host[256];
 451         struct in_addr addr;
 452
 453         if (num_parms(argbuf)<4) {
 454                 cprintf("%d usage error\n",ERROR);
 455                 return;
 456                 }
 457
 458         dev_code = extract_int(argbuf,0);
 459         cli_code = extract_int(argbuf,1);
 460         rev_level = extract_int(argbuf,2);
 461         extract(desc,argbuf,3);
 462
 463         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 464         from_host[sizeof from_host - 1] = 0;
 465         if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
 466
 467         CC->cs_clientdev = dev_code;
 468         CC->cs_clienttyp = cli_code;
 469         CC->cs_clientver = rev_level;
 470         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 471         CC->cs_clientname[31] = 0;
 472
 473         lprintf(9, "Looking up hostname '%s'\n", from_host);
 474         if ((strlen(from_host)>0) &&
 475            (is_public_client(CC->cs_host))) {
 476                 if ((addr.s_addr = inet_addr(from_host)) != INADDR_NONE)
 477                         locate_host(CC->cs_host, &addr);
 478                 else {
 479                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 480                         CC->cs_host[24] = 0;
 481                         }
 482                 }
 483
 484         syslog(LOG_NOTICE,"client %d/%d/%01d.%02d (%s)\n",
 485                 dev_code,
 486                 cli_code,
 487                 (rev_level / 100),
 488                 (rev_level % 100),
 489                 desc);
 490                 cprintf("%d Ok\n",OK);
 491         }
 492
 493
 494 /*
 495  * enter or exit "stealth mode"
 496  */
 497 void cmd_stel(char *cmdbuf)
 498 {
 499         int requested_mode;
 500
 501         requested_mode = extract_int(cmdbuf,0);
 502         if (requested_mode !=0) requested_mode = 1;
 503
 504         if (!CC->logged_in) {
 505                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 506                 return;
 507                 }
 508
 509         if (CC->usersupp.axlevel < 6) {
 510                 cprintf("%d You must be an Aide to use stealth mode.\n",
 511                         ERROR+HIGHER_ACCESS_REQUIRED);
 512                 return;
 513                 }
 514
 515         if (CC->cs_flags & CS_STEALTH) {
 516                 if (requested_mode == 0)
 517                         CC->cs_flags = CC->cs_flags-CS_STEALTH;
 518                 }
 519         else {
 520                 if (requested_mode == 1)
 521                         CC->cs_flags = CC->cs_flags|CS_STEALTH;
 522                 }
 523
 524         cprintf("%d Ok\n",OK);
 525         }
 526
 527
 528
 529
 530 /*
 531  * display system messages or help
 532  */
 533 void cmd_mesg(char *mname)
 534 {
 535         FILE *mfp;
 536         char targ[256];
 537         char buf[256];
 538         char *dirs[2];
 539
 540         extract(buf,mname,0);
 541
 542
 543         dirs[0]=mallok(64);
 544         dirs[1]=mallok(64);
 545         strcpy(dirs[0],"messages");
 546         strcpy(dirs[1],"help");
 547         mesg_locate(targ,buf,2,dirs);
 548         phree(dirs[0]);
 549         phree(dirs[1]);
 550
 551
 552         if (strlen(targ)==0) {
 553                 cprintf("%d '%s' not found.\n",ERROR,mname);
 554                 return;
 555                 }
 556
 557         mfp = fopen(targ,"r");
 558         if (mfp==NULL) {
 559                 cprintf("%d Cannot open '%s': %s\n",
 560                         ERROR,targ,strerror(errno));
 561                 return;
 562                 }
 563         cprintf("%d %s\n",LISTING_FOLLOWS,buf);
 564
 565         while (fgets(buf,255,mfp)!=NULL) {
 566                 buf[strlen(buf)-1] = 0;
 567                 do_help_subst(buf);
 568                 cprintf("%s\n",buf);
 569                 }
 570
 571         fclose(mfp);
 572         cprintf("000\n");
 573         }
 574
 575
 576 /*
 577  * enter system messages or help
 578  */
 579 void cmd_emsg(char *mname)
 580 {
 581         FILE *mfp;
 582         char targ[256];
 583         char buf[256];
 584         char *dirs[2];
 585         int a;
 586
 587         if (CC->usersupp.axlevel < 6) {
 588                 cprintf("%d You must be an Aide to edit system messages.\n",
 589                         ERROR+HIGHER_ACCESS_REQUIRED);
 590                 return;
 591                 }
 592
 593         extract(buf,mname,0);
 594         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 595                 if (buf[a] == '/') buf[a] = '.';
 596                 }
 597
 598         dirs[0]=mallok(64);
 599         dirs[1]=mallok(64);
 600         strcpy(dirs[0],"messages");
 601         strcpy(dirs[1],"help");
 602         mesg_locate(targ,buf,2,dirs);
 603         phree(dirs[0]);
 604         phree(dirs[1]);
 605
 606         if (strlen(targ)==0) {
 607                 snprintf(targ, sizeof targ, "./help/%s", buf);
 608                 }
 609
 610         mfp = fopen(targ,"w");
 611         if (mfp==NULL) {
 612                 cprintf("%d Cannot open '%s': %s\n",
 613                         ERROR,targ,strerror(errno));
 614                 return;
 615                 }
 616         cprintf("%d %s\n", SEND_LISTING, targ);
 617
 618         while (client_gets(buf), strcmp(buf, "000")) {
 619                 fprintf(mfp, "%s\n", buf);
 620                 }
 621
 622         fclose(mfp);
 623         }
 624
 625
 626 /* Don't show the names of private rooms unless the viewing
 627  * user also knows the rooms.
 628  */
 629 void GenerateRoomDisplay(char *real_room,
 630                         struct CitContext *viewed,
 631                         struct CitContext *viewer) {
 632
 633         strcpy(real_room, viewed->quickroom.QRname);
 634         if (viewed->quickroom.QRflags & QR_MAILBOX) {
 635                 strcpy(real_room, &real_room[11]);
 636         }
 637         if (viewed->quickroom.QRflags & QR_PRIVATE) {
 638                 if ( (CtdlRoomAccess(&viewed->quickroom, &viewer->usersupp)
 639                    & UA_KNOWN) == 0) {
 640                         strcpy(real_room, "<private room>");
 641                 }
 642         }
 643
 644         if (viewed->cs_flags & CS_CHAT) {
 645                 while (strlen(real_room) < 14)
 646                         strcat(real_room, " ");
 647
 648                 strcpy(&real_room[14], "<chat>");
 649         }
 650
 651 }
 652
 653
 654 /*
 655  * who's online
 656  */
 657 void cmd_rwho(void) {
 658         struct CitContext *cptr;
 659         int spoofed = 0;
 660         int aide;
 661         char un[40];
 662         char real_room[ROOMNAMELEN], room[ROOMNAMELEN];
 663         char host[40], flags[5];
 664
 665         aide = CC->usersupp.axlevel >= 6;
 666         cprintf("%d%c \n", LISTING_FOLLOWS, check_express() );
 667
 668         for (cptr = ContextList; cptr != NULL; cptr = cptr->next)
 669         {
 670                 flags[0] = '\0';
 671                 spoofed = 0;
 672
 673                 if (cptr->cs_flags & CS_POSTING)
 674                    strcat(flags, "*");
 675                 else
 676                    strcat(flags, ".");
 677
 678                 if (cptr->fake_username[0])
 679                 {
 680                    strcpy(un, cptr->fake_username);
 681                    spoofed = 1;
 682                 }
 683                 else
 684                    strcpy(un, cptr->curr_user);
 685
 686                 if (cptr->fake_hostname[0])
 687                 {
 688                    strcpy(host, cptr->fake_hostname);
 689                    spoofed = 1;
 690                 }
 691                 else
 692                    strcpy(host, cptr->cs_host);
 693
 694                 GenerateRoomDisplay(real_room, cptr, CC);
 695
 696                 if (cptr->fake_roomname[0]) {
 697                         strcpy(room, cptr->fake_roomname);
 698                         spoofed = 1;
 699                 }
 700                 else {
 701                         strcpy(room, real_room);
 702                 }
 703
 704                 if ((aide) && (spoofed))
 705                    strcat(flags, "+");
 706
 707                 if ((cptr->cs_flags & CS_STEALTH) && (aide))
 708                    strcat(flags, "-");
 709
 710                 if (((cptr->cs_flags&CS_STEALTH)==0) || (aide))
 711                 {
 712                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 713                                 cptr->cs_pid, un, room,
 714                                 host, cptr->cs_clientname,
 715                                 (long)(cptr->lastidle),
 716                                 cptr->lastcmdname, flags);
 717                 }
 718                 if ((spoofed) && (aide))
 719                 {
 720                         cprintf("%d|%s|%s|%s|%s|%ld|%s|%s\n",
 721                                 cptr->cs_pid, cptr->curr_user,
 722                                 real_room,
 723                                 cptr->cs_host, cptr->cs_clientname,
 724                                 (long)(cptr->lastidle),
 725                                 cptr->lastcmdname, flags);
 726
 727                 }
 728         }
 729
 730         /* Now it's magic time.  Before we finish, call any EVT_RWHO hooks
 731          * so that external paging modules such as serv_icq can add more
 732          * content to the Wholist.
 733          */
 734         PerformSessionHooks(EVT_RWHO);
 735         cprintf("000\n");
 736         }
 737
 738
 739 /*
 740  * Terminate another running session
 741  */
 742 void cmd_term(char *cmdbuf)
 743 {
 744         int session_num;
 745         struct CitContext *ccptr;
 746         int found_it = 0;
 747
 748         if (!CC->logged_in) {
 749                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 750                 return;
 751                 }
 752
 753         if (CC->usersupp.axlevel < 6) {
 754                 cprintf("%d You must be an Aide to terminate sessions.\n",
 755                         ERROR+HIGHER_ACCESS_REQUIRED);
 756                 return;
 757                 }
 758
 759         session_num = extract_int(cmdbuf, 0);
 760         if (session_num == CC->cs_pid) {
 761                 cprintf("%d You can't kill your own session.\n", ERROR);
 762                 return;
 763                 }
 764
 765         lprintf(9, "Locating session to kill\n");
 766         begin_critical_section(S_SESSION_TABLE);
 767         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 768                 if (session_num == ccptr->cs_pid) {
 769                         ccptr->kill_me = 1;
 770                         found_it = 1;
 771                         }
 772                 }
 773         end_critical_section(S_SESSION_TABLE);
 774
 775         if (found_it) {
 776                 cprintf("%d Session terminated.\n", OK);
 777                 }
 778         else {
 779                 cprintf("%d No such session.\n", ERROR);
 780                 }
 781         }
 782
 783
 784
 785
 786
 787 /*
 788  * get the paginator prompt
 789  */
 790 void cmd_more(void) {
 791         cprintf("%d %s\n",OK,config.c_moreprompt);
 792         }
 793
 794 /*
 795  * echo
 796  */
 797 void cmd_echo(char *etext)
 798 {
 799         cprintf("%d %s\n",OK,etext);
 800         }
 801
 802
 803
 804 /*
 805  * identify as internal program
 806  */
 807 void cmd_ipgm(char *argbuf)
 808 {
 809         int secret;
 810
 811         secret = extract_int(argbuf, 0);
 812         if (secret == config.c_ipgm_secret) {
 813                 CC->internal_pgm = 1;
 814                 strcpy(CC->curr_user, "<internal program>");
 815                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 816                 cprintf("%d Authenticated as an internal program.\n",OK);
 817                 }
 818         else {
 819                 cprintf("%d Authentication failed.\n",ERROR);
 820                 lprintf(3, "Warning: ipgm authentication failed.\n");
 821                 }
 822         }
 823
 824
 825 /*
 826  * Shut down the server
 827  */
 828 void cmd_down(void) {
 829         if (!CC->logged_in) {
 830                 cprintf("%d Not logged in.\n", ERROR+NOT_LOGGED_IN);
 831                 return;
 832                 }
 833
 834         if (CC->usersupp.axlevel < 6) {
 835                 cprintf("%d You must be an Aide to shut down the server.\n",
 836                         ERROR+HIGHER_ACCESS_REQUIRED);
 837                 return;
 838                 }
 839
 840         cprintf("%d Shutting down server.  Goodbye.\n", OK);
 841         master_cleanup();
 842         }
 843
 844 /*
 845  * Schedule or cancel a server shutdown
 846  */
 847 void cmd_scdn(char *argbuf)
 848 {
 849         int new_state;
 850
 851         if (!CC->logged_in) {
 852                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 853                 return;
 854                 }
 855
 856         if (CC->usersupp.axlevel < 6) {
 857                 cprintf("%d You must be an Aide to schedule a shutdown.\n",
 858                         ERROR+HIGHER_ACCESS_REQUIRED);
 859                 return;
 860                 }
 861
 862         new_state = extract_int(argbuf, 0);
 863         if ((new_state == 0) || (new_state == 1)) {
 864                 ScheduledShutdown = new_state;
 865                 }
 866         cprintf("%d %d\n", OK, ScheduledShutdown);
 867         }
 868
 869
 870 /*
 871  * Back-end function for starting a session
 872  */
 873 void begin_session(struct CitContext *con)
 874 {
 875         int len;
 876         struct sockaddr_in sin;
 877
 878         /*
 879          * Initialize some variables specific to our context.
 880          */
 881         con->logged_in = 0;
 882         con->internal_pgm = 0;
 883         con->download_fp = NULL;
 884         con->upload_fp = NULL;
 885         con->FirstExpressMessage = NULL;
 886         time(&con->lastcmd);
 887         time(&con->lastidle);
 888         strcpy(con->lastcmdname, "    ");
 889         strcpy(con->cs_clientname, "(unknown)");
 890         strcpy(con->curr_user, NLI);
 891         strcpy(con->net_node,"");
 892         snprintf(con->temp, sizeof con->temp, tmpnam(NULL));
 893         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 894         con->cs_host[sizeof con->cs_host - 1] = 0;
 895         len = sizeof sin;
 896         if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len))
 897                 locate_host(con->cs_host, &sin.sin_addr);
 898         con->cs_flags = 0;
 899         con->upload_type = UPL_FILE;
 900         con->dl_is_net = 0;
 901         con->FirstSessData = NULL;
 902
 903         con->nologin = 0;
 904         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
 905                 con->nologin = 1;
 906
 907         lprintf(3, "citserver[%3d]: started.\n", con->cs_pid);
 908
 909         /* Run any session startup routines registered by loadable modules */
 910         PerformSessionHooks(EVT_START);
 911
 912         rec_log(CL_CONNECT, "");
 913 }
 914
 915
 916 void citproto_begin_session() {
 917         if (CC->nologin==1) {
 918                 cprintf("%d %s: Too many users are already online "
 919                         "(maximum is %d)\n",
 920                         ERROR+MAX_SESSIONS_EXCEEDED,
 921                         config.c_nodename, config.c_maxsessions);
 922                 }
 923         else {
 924                 cprintf("%d %s Citadel/UX server ready.\n",
 925                         OK, config.c_nodename);
 926                 }
 927 }
 928
 929
 930
 931
 932 /*
 933  * This loop recognizes all server commands.
 934  */
 935 void do_command_loop(void) {
 936         char cmdbuf[256];
 937
 938         time(&CC->lastcmd);
 939         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 940         if (client_gets(cmdbuf) < 1) {
 941                 lprintf(3, "Client socket is broken.  Ending session.\n");
 942                 CC->kill_me = 1;
 943                 return;
 944         }
 945         lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 946
 947         /*
 948          * Let other clients see the last command we executed, and
 949          * update the idle time, but not NOOP, PEXP, or GEXP.
 950          */
 951         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 952            && (strncasecmp(cmdbuf, "PEXP", 4))
 953            && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
 954                 strcpy(CC->lastcmdname, "    ");
 955                 safestrncpy(CC->lastcmdname, cmdbuf,
 956                         sizeof(CC->lastcmdname) );
 957                 time(&CC->lastidle);
 958                 }
 959
 960         if ((strncasecmp(cmdbuf, "ENT0", 4))
 961            && (strncasecmp(cmdbuf, "MESG", 4))
 962            && (strncasecmp(cmdbuf, "MSGS", 4)))
 963         {
 964            CC->cs_flags &= ~CS_POSTING;
 965         }
 966
 967         if (!strncasecmp(cmdbuf,"NOOP",4)) {
 968                 cprintf("%d%cok\n",OK,check_express());
 969                 }
 970
 971         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 972                 cprintf("%d Goodbye.\n",OK);
 973                 CC->kill_me = 1;
 974                 }
 975
 976         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 977                 if (CC->logged_in) logout(CC);
 978                 cprintf("%d logged out.\n",OK);
 979                 }
 980
 981         else if (!strncasecmp(cmdbuf,"USER",4)) {
 982                 cmd_user(&cmdbuf[5]);
 983                 }
 984
 985         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 986                 cmd_pass(&cmdbuf[5]);
 987                 }
 988
 989         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 990                 cmd_newu(&cmdbuf[5]);
 991                 }
 992
 993         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 994                 cmd_setp(&cmdbuf[5]);
 995                 }
 996
 997         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 998                 cmd_lrms(&cmdbuf[5]);
 999                 }
1000
1001         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
1002                 cmd_lkra(&cmdbuf[5]);
1003                 }
1004
1005         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
1006                 cmd_lkrn(&cmdbuf[5]);
1007                 }
1008
1009         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
1010                 cmd_lkro(&cmdbuf[5]);
1011                 }
1012
1013         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
1014                 cmd_lzrm(&cmdbuf[5]);
1015                 }
1016
1017         else if (!strncasecmp(cmdbuf,"GETU",4)) {
1018                 cmd_getu();
1019                 }
1020
1021         else if (!strncasecmp(cmdbuf,"SETU",4)) {
1022                 cmd_setu(&cmdbuf[5]);
1023                 }
1024
1025         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1026                 cmd_goto(&cmdbuf[5]);
1027                 }
1028
1029         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1030                 cmd_msgs(&cmdbuf[5]);
1031                 }
1032
1033         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1034                 cmd_whok();
1035                 }
1036
1037         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1038                 cmd_rdir();
1039                 }
1040
1041         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1042                 cmd_msg0(&cmdbuf[5]);
1043                 }
1044
1045         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1046                 cmd_msg2(&cmdbuf[5]);
1047                 }
1048
1049         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1050                 cmd_msg3(&cmdbuf[5]);
1051                 }
1052
1053         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1054                 cmd_msg4(&cmdbuf[5]);
1055                 }
1056
1057         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1058                 cmd_opna(&cmdbuf[5]);
1059                 }
1060
1061         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1062                 cmd_info();
1063                 }
1064
1065         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1066                 cmd_slrp(&cmdbuf[5]);
1067                 }
1068
1069         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1070                 cmd_invt_kick(&cmdbuf[5],1);
1071                 }
1072
1073         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1074                 cmd_invt_kick(&cmdbuf[5],0);
1075                 }
1076
1077         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1078                 cmd_getr();
1079                 }
1080
1081         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1082                 cmd_setr(&cmdbuf[5]);
1083                 }
1084
1085         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1086                 cmd_geta();
1087                 }
1088
1089         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1090                 cmd_seta(&cmdbuf[5]);
1091                 }
1092
1093         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1094                 cmd_ent0(&cmdbuf[5]);
1095                 }
1096
1097         else if (!strncasecmp(cmdbuf,"ENT3",4)) {
1098                 cmd_ent3(&cmdbuf[5]);
1099                 }
1100
1101         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1102                 cmd_rinf();
1103                 }
1104
1105         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1106                 cmd_dele(&cmdbuf[5]);
1107                 }
1108
1109         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1110                 cmd_kill(&cmdbuf[5]);
1111                 }
1112
1113         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1114                 cmd_cre8(&cmdbuf[5]);
1115                 }
1116
1117         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1118                 cmd_move(&cmdbuf[5]);
1119                 }
1120
1121         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1122                 cmd_forg();
1123                 }
1124
1125         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1126                 cmd_mesg(&cmdbuf[5]);
1127                 }
1128
1129         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1130                 cmd_emsg(&cmdbuf[5]);
1131                 }
1132
1133         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1134                 cmd_gnur();
1135                 }
1136
1137         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1138                 cmd_vali(&cmdbuf[5]);
1139                 }
1140
1141         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1142                 cmd_einf(&cmdbuf[5]);
1143                 }
1144
1145         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1146                 cmd_list();
1147                 }
1148
1149         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1150                 cmd_chek();
1151                 }
1152
1153         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1154                 cmd_delf(&cmdbuf[5]);
1155                 }
1156
1157         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1158                 cmd_movf(&cmdbuf[5]);
1159                 }
1160
1161         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1162                 cmd_netf(&cmdbuf[5]);
1163                 }
1164
1165         else if (!strncasecmp(cmdbuf,"RWHO",4)) {
1166                 cmd_rwho();
1167                 }
1168
1169         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1170                 cmd_open(&cmdbuf[5]);
1171                 }
1172
1173         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1174                 cmd_clos();
1175                 }
1176
1177         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1178                 cmd_uopn(&cmdbuf[5]);
1179                 }
1180
1181         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1182                 cmd_ucls(&cmdbuf[5]);
1183                 }
1184
1185         else if (!strncasecmp(cmdbuf,"READ",4)) {
1186                 cmd_read(&cmdbuf[5]);
1187                 }
1188
1189         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1190                 cmd_writ(&cmdbuf[5]);
1191                 }
1192
1193         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1194                 cmd_qusr(&cmdbuf[5]);
1195                 }
1196
1197         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1198                 cmd_echo(&cmdbuf[5]);
1199                 }
1200
1201         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1202                 cmd_oimg(&cmdbuf[5]);
1203                 }
1204
1205         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1206                 cmd_more();
1207                 }
1208
1209         else if (!strncasecmp(cmdbuf,"NETP",4)) {
1210                 cmd_netp(&cmdbuf[5]);
1211                 }
1212
1213         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1214                 cmd_ndop(&cmdbuf[5]);
1215                 }
1216
1217         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1218                 cmd_nuop(&cmdbuf[5]);
1219                 }
1220
1221         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1222                 cmd_lflr();
1223                 }
1224
1225         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1226                 cmd_cflr(&cmdbuf[5]);
1227                 }
1228
1229         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1230                 cmd_kflr(&cmdbuf[5]);
1231                 }
1232
1233         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1234                 cmd_eflr(&cmdbuf[5]);
1235                 }
1236
1237         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1238                 cmd_iden(&cmdbuf[5]);
1239                 }
1240
1241         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1242                 cmd_ipgm(&cmdbuf[5]);
1243                 }
1244
1245         else if (!strncasecmp(cmdbuf,"EBIO",4)) {
1246                 cmd_ebio();
1247                 }
1248
1249         else if (!strncasecmp(cmdbuf,"RBIO",4)) {
1250                 cmd_rbio(&cmdbuf[5]);
1251                 }
1252
1253         else if (!strncasecmp(cmdbuf,"LBIO",4)) {
1254                 cmd_lbio();
1255                 }
1256
1257         else if (!strncasecmp(cmdbuf,"STEL",4)) {
1258                 cmd_stel(&cmdbuf[5]);
1259                 }
1260
1261         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1262                 cmd_term(&cmdbuf[5]);
1263                 }
1264
1265         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1266                 cmd_down();
1267                 }
1268
1269         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1270                 cmd_scdn(&cmdbuf[5]);
1271                 }
1272
1273         else if (!strncasecmp(cmdbuf, "NSET", 4)) {
1274                 cmd_nset(&cmdbuf[5]);
1275                 }
1276
1277         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1278                 cmd_uimg(&cmdbuf[5]);
1279                 }
1280
1281         else if (!strncasecmp(cmdbuf, "UCHG", 4)) {
1282                 cmd_uchg(&cmdbuf[5]);
1283                 }
1284
1285         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1286                 cmd_time();
1287                 }
1288
1289         else if (!strncasecmp(cmdbuf, "HCHG", 4)) {
1290                 cmd_hchg(&cmdbuf[5]);
1291                 }
1292
1293         else if (!strncasecmp(cmdbuf, "RCHG", 4)) {
1294                 cmd_rchg(&cmdbuf[5]);
1295                 }
1296
1297         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1298                 cmd_agup(&cmdbuf[5]);
1299                 }
1300
1301         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1302                 cmd_asup(&cmdbuf[5]);
1303                 }
1304
1305         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1306                 cmd_gpex(&cmdbuf[5]);
1307                 }
1308
1309         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1310                 cmd_spex(&cmdbuf[5]);
1311                 }
1312
1313         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1314                 cmd_conf(&cmdbuf[5]);
1315                 }
1316
1317 #ifdef DEBUG_MEMORY_LEAKS
1318         else if (!strncasecmp(cmdbuf, "LEAK", 4)) {
1319                 dump_tracked();
1320                 }
1321 #endif
1322
1323         else if (!DLoader_Exec_Cmd(cmdbuf))
1324                 {
1325                    cprintf("%d Unrecognized or unsupported command.\n",
1326                             ERROR);
1327                 }
1328
1329         /* Run any after-each-command outines registered by modules */
1330         PerformSessionHooks(EVT_CMD);
1331 }