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