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